19 files changed, 9166 insertions, 0 deletions

diff --git a/drivers/accel/qaic/Kconfig b/drivers/accel/qaic/Kconfig
new file mode 100644
index 000000000..116e42d15
--- /dev/null
+++ b/drivers/accel/qaic/Kconfig
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Qualcomm Cloud AI accelerators driver
+#
+
+config DRM_ACCEL_QAIC
+	tristate "Qualcomm Cloud AI accelerators"
+	depends on DRM_ACCEL
+	depends on PCI && HAS_IOMEM
+	depends on MHI_BUS
+	select CRC32
+	select WANT_DEV_COREDUMP
+	help
+	  Enables driver for Qualcomm's Cloud AI accelerator PCIe cards that are
+	  designed to accelerate Deep Learning inference workloads.
+
+	  The driver manages the PCIe devices and provides an IOCTL interface
+	  for users to submit workloads to the devices.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called qaic.
diff --git a/drivers/accel/qaic/Makefile b/drivers/accel/qaic/Makefile
new file mode 100644
index 000000000..71f727b74
--- /dev/null
+++ b/drivers/accel/qaic/Makefile
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for Qualcomm Cloud AI accelerators driver
+#
+
+obj-$(CONFIG_DRM_ACCEL_QAIC)	:= qaic.o
+
+qaic-y := \
+	mhi_controller.o \
+	qaic_control.o \
+	qaic_data.o \
+	qaic_drv.o \
+	qaic_ras.o \
+	qaic_ssr.o \
+	qaic_sysfs.o \
+	qaic_timesync.o \
+	sahara.o
+
+qaic-$(CONFIG_DEBUG_FS) += qaic_debugfs.o
diff --git a/drivers/accel/qaic/mhi_controller.c b/drivers/accel/qaic/mhi_controller.c
new file mode 100644
index 000000000..4d787f77c
--- /dev/null
+++ b/drivers/accel/qaic/mhi_controller.c
@@ -0,0 +1,932 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2019-2021, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/memblock.h>
+#include <linux/mhi.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+#include <linux/sizes.h>
+
+#include "mhi_controller.h"
+#include "qaic.h"
+
+#define MAX_RESET_TIME_SEC 25
+
+static unsigned int mhi_timeout_ms = 2000; /* 2 sec default */
+module_param(mhi_timeout_ms, uint, 0600);
+MODULE_PARM_DESC(mhi_timeout_ms, "MHI controller timeout value");
+
+static const char *fw_image_paths[FAMILY_MAX] = {
+	[FAMILY_AIC100] = "qcom/aic100/sbl.bin",
+	[FAMILY_AIC200] = "qcom/aic200/sbl.bin",
+};
+
+static const struct mhi_channel_config aic100_channels[] = {
+	{
+		.name = "QAIC_LOOPBACK",
+		.num = 0,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOOPBACK",
+		.num = 1,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SAHARA",
+		.num = 2,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SAHARA",
+		.num = 3,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DIAG",
+		.num = 4,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DIAG",
+		.num = 5,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SSR",
+		.num = 6,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SSR",
+		.num = 7,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_QDSS",
+		.num = 8,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_QDSS",
+		.num = 9,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_CONTROL",
+		.num = 10,
+		.num_elements = 128,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_CONTROL",
+		.num = 11,
+		.num_elements = 128,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOGGING",
+		.num = 12,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOGGING",
+		.num = 13,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_STATUS",
+		.num = 14,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_STATUS",
+		.num = 15,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TELEMETRY",
+		.num = 16,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TELEMETRY",
+		.num = 17,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DEBUG",
+		.num = 18,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DEBUG",
+		.num = 19,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TIMESYNC",
+		.num = 20,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TIMESYNC",
+		.num = 21,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TIMESYNC_PERIODIC",
+		.num = 22,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TIMESYNC_PERIODIC",
+		.num = 23,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "IPCR",
+		.num = 24,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "IPCR",
+		.num = 25,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+};
+
+static const struct mhi_channel_config aic200_channels[] = {
+	{
+		.name = "QAIC_LOOPBACK",
+		.num = 0,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOOPBACK",
+		.num = 1,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SAHARA",
+		.num = 2,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SAHARA",
+		.num = 3,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SSR",
+		.num = 6,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SSR",
+		.num = 7,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_CONTROL",
+		.num = 10,
+		.num_elements = 128,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_CONTROL",
+		.num = 11,
+		.num_elements = 128,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOGGING",
+		.num = 12,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOGGING",
+		.num = 13,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_STATUS",
+		.num = 14,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_STATUS",
+		.num = 15,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TELEMETRY",
+		.num = 16,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TELEMETRY",
+		.num = 17,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TIMESYNC_PERIODIC",
+		.num = 22,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TIMESYNC_PERIODIC",
+		.num = 23,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "IPCR",
+		.num = 24,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "IPCR",
+		.num = 25,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.wake_capable = false,
+	},
+};
+
+static struct mhi_event_config aic100_events[] = {
+	{
+		.num_elements = 32,
+		.irq_moderation_ms = 0,
+		.irq = 0,
+		.channel = U32_MAX,
+		.priority = 1,
+		.mode = MHI_DB_BRST_DISABLE,
+		.data_type = MHI_ER_CTRL,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
+};
+
+static struct mhi_event_config aic200_events[] = {
+	{
+		.num_elements = 32,
+		.irq_moderation_ms = 0,
+		.irq = 0,
+		.channel = U32_MAX,
+		.priority = 1,
+		.mode = MHI_DB_BRST_DISABLE,
+		.data_type = MHI_ER_CTRL,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
+};
+
+static struct mhi_controller_config mhi_cntrl_configs[] = {
+	[FAMILY_AIC100] = {
+		.max_channels = 128,
+		.timeout_ms = 0, /* controlled by mhi_timeout */
+		.buf_len = 0,
+		.num_channels = ARRAY_SIZE(aic100_channels),
+		.ch_cfg = aic100_channels,
+		.num_events = ARRAY_SIZE(aic100_events),
+		.event_cfg = aic100_events,
+		.use_bounce_buf = false,
+		.m2_no_db = false,
+	},
+	[FAMILY_AIC200] = {
+		.max_channels = 128,
+		.timeout_ms = 0, /* controlled by mhi_timeout */
+		.buf_len = 0,
+		.num_channels = ARRAY_SIZE(aic200_channels),
+		.ch_cfg = aic200_channels,
+		.num_events = ARRAY_SIZE(aic200_events),
+		.event_cfg = aic200_events,
+		.use_bounce_buf = false,
+		.m2_no_db = false,
+	},
+};
+
+static int mhi_read_reg(struct mhi_controller *mhi_cntrl, void __iomem *addr, u32 *out)
+{
+	u32 tmp;
+
+	/*
+	 * SOC_HW_VERSION quirk
+	 * The SOC_HW_VERSION register (offset 0x224) is not reliable and
+	 * may contain uninitialized values, including 0xFFFFFFFF. This could
+	 * cause a false positive link down error.  Instead, intercept any
+	 * reads and provide the correct value of the register.
+	 */
+	if (addr - mhi_cntrl->regs == 0x224) {
+		*out = 0x60110200;
+		return 0;
+	}
+
+	tmp = readl_relaxed(addr);
+	if (tmp == U32_MAX)
+		return -EIO;
+
+	*out = tmp;
+
+	return 0;
+}
+
+static void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *addr, u32 val)
+{
+	writel_relaxed(val, addr);
+}
+
+static int mhi_runtime_get(struct mhi_controller *mhi_cntrl)
+{
+	return 0;
+}
+
+static void mhi_runtime_put(struct mhi_controller *mhi_cntrl)
+{
+}
+
+static void mhi_status_cb(struct mhi_controller *mhi_cntrl, enum mhi_callback reason)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_cntrl->cntrl_dev));
+
+	/* this event occurs in atomic context */
+	if (reason == MHI_CB_FATAL_ERROR)
+		pci_err(qdev->pdev, "Fatal error received from device. Attempting to recover\n");
+	/* this event occurs in non-atomic context */
+	if (reason == MHI_CB_SYS_ERROR)
+		qaic_dev_reset_clean_local_state(qdev);
+}
+
+static int mhi_reset_and_async_power_up(struct mhi_controller *mhi_cntrl)
+{
+	u8 time_sec = 1;
+	int current_ee;
+	int ret;
+
+	/* Reset the device to bring the device in PBL EE */
+	mhi_soc_reset(mhi_cntrl);
+
+	/*
+	 * Keep checking the execution environment(EE) after every 1 second
+	 * interval.
+	 */
+	do {
+		msleep(1000);
+		current_ee = mhi_get_exec_env(mhi_cntrl);
+	} while (current_ee != MHI_EE_PBL && time_sec++ <= MAX_RESET_TIME_SEC);
+
+	/* If the device is in PBL EE retry power up */
+	if (current_ee == MHI_EE_PBL)
+		ret = mhi_async_power_up(mhi_cntrl);
+	else
+		ret = -EIO;
+
+	return ret;
+}
+
+struct mhi_controller *qaic_mhi_register_controller(struct pci_dev *pci_dev, void __iomem *mhi_bar,
+						    int mhi_irq, bool shared_msi, int family)
+{
+	struct mhi_controller_config mhi_config = mhi_cntrl_configs[family];
+	struct mhi_controller *mhi_cntrl;
+	int ret;
+
+	mhi_cntrl = devm_kzalloc(&pci_dev->dev, sizeof(*mhi_cntrl), GFP_KERNEL);
+	if (!mhi_cntrl)
+		return ERR_PTR(-ENOMEM);
+
+	mhi_cntrl->cntrl_dev = &pci_dev->dev;
+
+	/*
+	 * Covers the entire possible physical ram region. Remote side is
+	 * going to calculate a size of this range, so subtract 1 to prevent
+	 * rollover.
+	 */
+	mhi_cntrl->iova_start = 0;
+	mhi_cntrl->iova_stop = PHYS_ADDR_MAX - 1;
+	mhi_cntrl->status_cb = mhi_status_cb;
+	mhi_cntrl->runtime_get = mhi_runtime_get;
+	mhi_cntrl->runtime_put = mhi_runtime_put;
+	mhi_cntrl->read_reg = mhi_read_reg;
+	mhi_cntrl->write_reg = mhi_write_reg;
+	mhi_cntrl->regs = mhi_bar;
+	mhi_cntrl->reg_len = SZ_4K;
+	mhi_cntrl->nr_irqs = 1;
+	mhi_cntrl->irq = devm_kmalloc(&pci_dev->dev, sizeof(*mhi_cntrl->irq), GFP_KERNEL);
+
+	if (!mhi_cntrl->irq)
+		return ERR_PTR(-ENOMEM);
+
+	mhi_cntrl->irq[0] = mhi_irq;
+
+	if (shared_msi) /* MSI shared with data path, no IRQF_NO_SUSPEND */
+		mhi_cntrl->irq_flags = IRQF_SHARED;
+
+	mhi_cntrl->fw_image = fw_image_paths[family];
+
+	if (family == FAMILY_AIC200) {
+		mhi_cntrl->name = "AIC200";
+		mhi_cntrl->seg_len = SZ_512K;
+	} else {
+		mhi_cntrl->name = "AIC100";
+	}
+
+	/* use latest configured timeout */
+	mhi_config.timeout_ms = mhi_timeout_ms;
+	ret = mhi_register_controller(mhi_cntrl, &mhi_config);
+	if (ret) {
+		pci_err(pci_dev, "mhi_register_controller failed %d\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	ret = mhi_prepare_for_power_up(mhi_cntrl);
+	if (ret) {
+		pci_err(pci_dev, "mhi_prepare_for_power_up failed %d\n", ret);
+		goto prepare_power_up_fail;
+	}
+
+	ret = mhi_async_power_up(mhi_cntrl);
+	/*
+	 * If EIO is returned it is possible that device is in SBL EE, which is
+	 * undesired. SOC reset the device and try to power up again.
+	 */
+	if (ret == -EIO && MHI_EE_SBL == mhi_get_exec_env(mhi_cntrl)) {
+		pci_err(pci_dev, "Found device in SBL at MHI init. Attempting a reset.\n");
+		ret = mhi_reset_and_async_power_up(mhi_cntrl);
+	}
+
+	if (ret) {
+		pci_err(pci_dev, "mhi_async_power_up failed %d\n", ret);
+		goto power_up_fail;
+	}
+
+	return mhi_cntrl;
+
+power_up_fail:
+	mhi_unprepare_after_power_down(mhi_cntrl);
+prepare_power_up_fail:
+	mhi_unregister_controller(mhi_cntrl);
+	return ERR_PTR(ret);
+}
+
+void qaic_mhi_free_controller(struct mhi_controller *mhi_cntrl, bool link_up)
+{
+	mhi_power_down(mhi_cntrl, link_up);
+	mhi_unprepare_after_power_down(mhi_cntrl);
+	mhi_unregister_controller(mhi_cntrl);
+}
+
+void qaic_mhi_start_reset(struct mhi_controller *mhi_cntrl)
+{
+	mhi_power_down(mhi_cntrl, true);
+}
+
+void qaic_mhi_reset_done(struct mhi_controller *mhi_cntrl)
+{
+	struct pci_dev *pci_dev = container_of(mhi_cntrl->cntrl_dev, struct pci_dev, dev);
+	int ret;
+
+	ret = mhi_async_power_up(mhi_cntrl);
+	if (ret)
+		pci_err(pci_dev, "mhi_async_power_up failed after reset %d\n", ret);
+}
diff --git a/drivers/accel/qaic/mhi_controller.h b/drivers/accel/qaic/mhi_controller.h
new file mode 100644
index 000000000..8939f6ae1
--- /dev/null
+++ b/drivers/accel/qaic/mhi_controller.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef MHICONTROLLERQAIC_H_
+#define MHICONTROLLERQAIC_H_
+
+struct mhi_controller *qaic_mhi_register_controller(struct pci_dev *pci_dev, void __iomem *mhi_bar,
+						    int mhi_irq, bool shared_msi, int family);
+void qaic_mhi_free_controller(struct mhi_controller *mhi_cntrl, bool link_up);
+void qaic_mhi_start_reset(struct mhi_controller *mhi_cntrl);
+void qaic_mhi_reset_done(struct mhi_controller *mhi_cntrl);
+
+#endif /* MHICONTROLLERQAIC_H_ */
diff --git a/drivers/accel/qaic/qaic.h b/drivers/accel/qaic/qaic.h
new file mode 100644
index 000000000..fa7a81556
--- /dev/null
+++ b/drivers/accel/qaic/qaic.h
@@ -0,0 +1,360 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _QAIC_H_
+#define _QAIC_H_
+
+#include <linux/interrupt.h>
+#include <linux/kref.h>
+#include <linux/mhi.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+#include <linux/srcu.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <drm/drm_device.h>
+#include <drm/drm_gem.h>
+
+#define QAIC_DBC_BASE		SZ_128K
+#define QAIC_DBC_SIZE		SZ_4K
+#define QAIC_SSR_DBC_SENTINEL	U32_MAX /* No ongoing SSR sentinel */
+
+#define QAIC_NO_PARTITION	-1
+
+#define QAIC_DBC_OFF(i)		((i) * QAIC_DBC_SIZE + QAIC_DBC_BASE)
+
+#define to_qaic_bo(obj) container_of(obj, struct qaic_bo, base)
+#define to_qaic_drm_device(dev) container_of(dev, struct qaic_drm_device, drm)
+#define to_drm(qddev) (&(qddev)->drm)
+#define to_accel_kdev(qddev) (to_drm(qddev)->accel->kdev) /* Return Linux device of accel node */
+#define to_qaic_device(dev) (to_qaic_drm_device((dev))->qdev)
+
+enum aic_families {
+	FAMILY_AIC100,
+	FAMILY_AIC200,
+	FAMILY_MAX,
+};
+
+enum __packed dev_states {
+	/* Device is offline or will be very soon */
+	QAIC_OFFLINE,
+	/* Device is booting, not clear if it's in a usable state */
+	QAIC_BOOT,
+	/* Device is fully operational */
+	QAIC_ONLINE,
+};
+
+enum dbc_states {
+	/* DBC is free and can be activated */
+	DBC_STATE_IDLE,
+	/* DBC is activated and a workload is running on device */
+	DBC_STATE_ASSIGNED,
+	/* Sub-system associated with this workload has crashed and it will shutdown soon */
+	DBC_STATE_BEFORE_SHUTDOWN,
+	/* Sub-system associated with this workload has crashed and it has shutdown */
+	DBC_STATE_AFTER_SHUTDOWN,
+	/* Sub-system associated with this workload is shutdown and it will be powered up soon */
+	DBC_STATE_BEFORE_POWER_UP,
+	/* Sub-system associated with this workload is now powered up */
+	DBC_STATE_AFTER_POWER_UP,
+	DBC_STATE_MAX,
+};
+
+extern bool datapath_polling;
+
+struct qaic_user {
+	/* Uniquely identifies this user for the device */
+	int			handle;
+	struct kref		ref_count;
+	/* Char device opened by this user */
+	struct qaic_drm_device	*qddev;
+	/* Node in list of users that opened this drm device */
+	struct list_head	node;
+	/* SRCU used to synchronize this user during cleanup */
+	struct srcu_struct	qddev_lock;
+	atomic_t		chunk_id;
+};
+
+struct dma_bridge_chan {
+	/* Pointer to device strcut maintained by driver */
+	struct qaic_device	*qdev;
+	/* ID of this DMA bridge channel(DBC) */
+	unsigned int		id;
+	/* Synchronizes access to xfer_list */
+	spinlock_t		xfer_lock;
+	/* Base address of request queue */
+	void			*req_q_base;
+	/* Base address of response queue */
+	void			*rsp_q_base;
+	/*
+	 * Base bus address of request queue. Response queue bus address can be
+	 * calculated by adding request queue size to this variable
+	 */
+	dma_addr_t		dma_addr;
+	/* Total size of request and response queue in byte */
+	u32			total_size;
+	/* Capacity of request/response queue */
+	u32			nelem;
+	/* The user that opened this DBC */
+	struct qaic_user	*usr;
+	/*
+	 * Request ID of next memory handle that goes in request queue. One
+	 * memory handle can enqueue more than one request elements, all
+	 * this requests that belong to same memory handle have same request ID
+	 */
+	u16			next_req_id;
+	/* true: DBC is in use; false: DBC not in use */
+	bool			in_use;
+	/*
+	 * Base address of device registers. Used to read/write request and
+	 * response queue's head and tail pointer of this DBC.
+	 */
+	void __iomem		*dbc_base;
+	/* Synchronizes access to Request queue's head and tail pointer */
+	struct mutex		req_lock;
+	/* Head of list where each node is a memory handle queued in request queue */
+	struct list_head	xfer_list;
+	/* Synchronizes DBC readers during cleanup */
+	struct srcu_struct	ch_lock;
+	/*
+	 * When this DBC is released, any thread waiting on this wait queue is
+	 * woken up
+	 */
+	wait_queue_head_t	dbc_release;
+	/* Head of list where each node is a bo associated with this DBC */
+	struct list_head	bo_lists;
+	/* The irq line for this DBC. Used for polling */
+	unsigned int		irq;
+	/* Polling work item to simulate interrupts */
+	struct work_struct	poll_work;
+	/* Represents various states of this DBC from enum dbc_states */
+	unsigned int		state;
+};
+
+struct qaic_device {
+	/* Pointer to base PCI device struct of our physical device */
+	struct pci_dev		*pdev;
+	/* Req. ID of request that will be queued next in MHI control device */
+	u32			next_seq_num;
+	/* Base address of the MHI bar */
+	void __iomem		*bar_mhi;
+	/* Base address of the DBCs bar */
+	void __iomem		*bar_dbc;
+	/* Controller structure for MHI devices */
+	struct mhi_controller	*mhi_cntrl;
+	/* MHI control channel device */
+	struct mhi_device	*cntl_ch;
+	/* List of requests queued in MHI control device */
+	struct list_head	cntl_xfer_list;
+	/* Synchronizes MHI control device transactions and its xfer list */
+	struct mutex		cntl_mutex;
+	/* Array of DBC struct of this device */
+	struct dma_bridge_chan	*dbc;
+	/* Work queue for tasks related to MHI control device */
+	struct workqueue_struct	*cntl_wq;
+	/* Synchronizes all the users of device during cleanup */
+	struct srcu_struct	dev_lock;
+	/* Track the state of the device during resets */
+	enum dev_states		dev_state;
+	/* true: single MSI is used to operate device */
+	bool			single_msi;
+	/*
+	 * true: A tx MHI transaction has failed and a rx buffer is still queued
+	 * in control device. Such a buffer is considered lost rx buffer
+	 * false: No rx buffer is lost in control device
+	 */
+	bool			cntl_lost_buf;
+	/* Maximum number of DBC supported by this device */
+	u32			num_dbc;
+	/* Reference to the drm_device for this device when it is created */
+	struct qaic_drm_device	*qddev;
+	/* Generate the CRC of a control message */
+	u32 (*gen_crc)(void *msg);
+	/* Validate the CRC of a control message */
+	bool (*valid_crc)(void *msg);
+	/* MHI "QAIC_TIMESYNC" channel device */
+	struct mhi_device	*qts_ch;
+	/* Work queue for tasks related to MHI "QAIC_TIMESYNC" channel */
+	struct workqueue_struct	*qts_wq;
+	/* MHI "QAIC_TIMESYNC_PERIODIC" channel device */
+	struct mhi_device	*mqts_ch;
+	/* Head of list of page allocated by MHI bootlog device */
+	struct list_head        bootlog;
+	/* MHI bootlog channel device */
+	struct mhi_device       *bootlog_ch;
+	/* Work queue for tasks related to MHI bootlog device */
+	struct workqueue_struct *bootlog_wq;
+	/* Synchronizes access of pages in MHI bootlog device */
+	struct mutex            bootlog_mutex;
+	/* MHI RAS channel device */
+	struct mhi_device	*ras_ch;
+	/* Correctable error count */
+	unsigned int		ce_count;
+	/* Un-correctable error count */
+	unsigned int		ue_count;
+	/* Un-correctable non-fatal error count */
+	unsigned int		ue_nf_count;
+	/* MHI SSR channel device */
+	struct mhi_device	*ssr_ch;
+	/* Work queue for tasks related to MHI SSR device */
+	struct workqueue_struct	*ssr_wq;
+	/* Buffer to collect SSR crashdump via SSR MHI channel */
+	void			*ssr_mhi_buf;
+	/* DBC which is under SSR. Sentinel U32_MAX would mean that no SSR in progress */
+	u32			ssr_dbc;
+};
+
+struct qaic_drm_device {
+	/* The drm device struct of this drm device */
+	struct drm_device	drm;
+	/* Pointer to the root device struct driven by this driver */
+	struct qaic_device	*qdev;
+	/*
+	 * The physical device can be partition in number of logical devices.
+	 * And each logical device is given a partition id. This member stores
+	 * that id. QAIC_NO_PARTITION is a sentinel used to mark that this drm
+	 * device is the actual physical device
+	 */
+	s32			partition_id;
+	/* Head in list of users who have opened this drm device */
+	struct list_head	users;
+	/* Synchronizes access to users list */
+	struct mutex		users_mutex;
+	/* Pointer to array of DBC sysfs attributes */
+	void			*sysfs_attrs;
+};
+
+struct qaic_bo {
+	struct drm_gem_object	base;
+	/* Scatter/gather table for allocate/imported BO */
+	struct sg_table		*sgt;
+	/* Head in list of slices of this BO */
+	struct list_head	slices;
+	/* Total nents, for all slices of this BO */
+	int			total_slice_nents;
+	/*
+	 * Direction of transfer. It can assume only two value DMA_TO_DEVICE and
+	 * DMA_FROM_DEVICE.
+	 */
+	int			dir;
+	/* The pointer of the DBC which operates on this BO */
+	struct dma_bridge_chan	*dbc;
+	/* Number of slice that belongs to this buffer */
+	u32			nr_slice;
+	/* Number of slice that have been transferred by DMA engine */
+	u32			nr_slice_xfer_done;
+	/*
+	 * If true then user has attached slicing information to this BO by
+	 * calling DRM_IOCTL_QAIC_ATTACH_SLICE_BO ioctl.
+	 */
+	bool			sliced;
+	/* Request ID of this BO if it is queued for execution */
+	u16			req_id;
+	/* Wait on this for completion of DMA transfer of this BO */
+	struct completion	xfer_done;
+	/*
+	 * Node in linked list where head is dbc->xfer_list.
+	 * This link list contain BO's that are queued for DMA transfer.
+	 */
+	struct list_head	xfer_list;
+	/*
+	 * Node in linked list where head is dbc->bo_lists.
+	 * This link list contain BO's that are associated with the DBC it is
+	 * linked to.
+	 */
+	struct list_head	bo_list;
+	struct {
+		/*
+		 * Latest timestamp(ns) at which kernel received a request to
+		 * execute this BO
+		 */
+		u64		req_received_ts;
+		/*
+		 * Latest timestamp(ns) at which kernel enqueued requests of
+		 * this BO for execution in DMA queue
+		 */
+		u64		req_submit_ts;
+		/*
+		 * Latest timestamp(ns) at which kernel received a completion
+		 * interrupt for requests of this BO
+		 */
+		u64		req_processed_ts;
+		/*
+		 * Number of elements already enqueued in DMA queue before
+		 * enqueuing requests of this BO
+		 */
+		u32		queue_level_before;
+	} perf_stats;
+	/* Synchronizes BO operations */
+	struct mutex		lock;
+};
+
+struct bo_slice {
+	/* Mapped pages */
+	struct sg_table		*sgt;
+	/* Number of requests required to queue in DMA queue */
+	int			nents;
+	/* See enum dma_data_direction */
+	int			dir;
+	/* Actual requests that will be copied in DMA queue */
+	struct dbc_req		*reqs;
+	struct kref		ref_count;
+	/* true: No DMA transfer required */
+	bool			no_xfer;
+	/* Pointer to the parent BO handle */
+	struct qaic_bo		*bo;
+	/* Node in list of slices maintained by parent BO */
+	struct list_head	slice;
+	/* Size of this slice in bytes */
+	u64			size;
+	/* Offset of this slice in buffer */
+	u64			offset;
+};
+
+int get_dbc_req_elem_size(void);
+int get_dbc_rsp_elem_size(void);
+int get_cntl_version(struct qaic_device *qdev, struct qaic_user *usr, u16 *major, u16 *minor);
+int qaic_manage_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+void qaic_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result);
+
+void qaic_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result);
+
+int qaic_control_open(struct qaic_device *qdev);
+void qaic_control_close(struct qaic_device *qdev);
+void qaic_release_usr(struct qaic_device *qdev, struct qaic_user *usr);
+
+irqreturn_t dbc_irq_threaded_fn(int irq, void *data);
+irqreturn_t dbc_irq_handler(int irq, void *data);
+int disable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr);
+void enable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr);
+void wakeup_dbc(struct qaic_device *qdev, u32 dbc_id);
+void release_dbc(struct qaic_device *qdev, u32 dbc_id);
+void qaic_data_get_fifo_info(struct dma_bridge_chan *dbc, u32 *head, u32 *tail);
+
+void wake_all_cntl(struct qaic_device *qdev);
+void qaic_dev_reset_clean_local_state(struct qaic_device *qdev);
+
+struct drm_gem_object *qaic_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf);
+
+int qaic_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+int qaic_mmap_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+int qaic_execute_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+int qaic_partial_execute_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+int qaic_wait_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+int qaic_perf_stats_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+int qaic_detach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+void qaic_irq_polling_work(struct work_struct *work);
+void qaic_dbc_enter_ssr(struct qaic_device *qdev, u32 dbc_id);
+void qaic_dbc_exit_ssr(struct qaic_device *qdev);
+
+/* qaic_sysfs.c */
+int qaic_sysfs_init(struct qaic_drm_device *qddev);
+void qaic_sysfs_remove(struct qaic_drm_device *qddev);
+void set_dbc_state(struct qaic_device *qdev, u32 dbc_id, unsigned int state);
+
+#endif /* _QAIC_H_ */
diff --git a/drivers/accel/qaic/qaic_control.c b/drivers/accel/qaic/qaic_control.c
new file mode 100644
index 000000000..43f84d438
--- /dev/null
+++ b/drivers/accel/qaic/qaic_control.c
@@ -0,0 +1,1604 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2019-2021, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <asm/byteorder.h>
+#include <linux/completion.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/mhi.h>
+#include <linux/mm.h>
+#include <linux/moduleparam.h>
+#include <linux/mutex.h>
+#include <linux/overflow.h>
+#include <linux/pci.h>
+#include <linux/scatterlist.h>
+#include <linux/sched/signal.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/workqueue.h>
+#include <linux/wait.h>
+#include <drm/drm_device.h>
+#include <drm/drm_file.h>
+#include <uapi/drm/qaic_accel.h>
+
+#include "qaic.h"
+
+#define MANAGE_MAGIC_NUMBER		((__force __le32)0x43494151) /* "QAIC" in little endian */
+#define QAIC_DBC_Q_GAP			SZ_256
+#define QAIC_DBC_Q_BUF_ALIGN		SZ_4K
+#define QAIC_MANAGE_WIRE_MSG_LENGTH	SZ_64K /* Max DMA message length */
+#define QAIC_WRAPPER_MAX_SIZE		SZ_4K
+#define QAIC_MHI_RETRY_WAIT_MS		100
+#define QAIC_MHI_RETRY_MAX		20
+
+static unsigned int control_resp_timeout_s = 60; /* 60 sec default */
+module_param(control_resp_timeout_s, uint, 0600);
+MODULE_PARM_DESC(control_resp_timeout_s, "Timeout for NNC responses from QSM");
+
+struct manage_msg {
+	u32 len;
+	u32 count;
+	u8 data[];
+};
+
+/*
+ * wire encoding structures for the manage protocol.
+ * All fields are little endian on the wire
+ */
+struct wire_msg_hdr {
+	__le32 crc32; /* crc of everything following this field in the message */
+	__le32 magic_number;
+	__le32 sequence_number;
+	__le32 len; /* length of this message */
+	__le32 count; /* number of transactions in this message */
+	__le32 handle; /* unique id to track the resources consumed */
+	__le32 partition_id; /* partition id for the request (signed) */
+	__le32 padding; /* must be 0 */
+} __packed;
+
+struct wire_msg {
+	struct wire_msg_hdr hdr;
+	u8 data[];
+} __packed;
+
+struct wire_trans_hdr {
+	__le32 type;
+	__le32 len;
+} __packed;
+
+/* Each message sent from driver to device are organized in a list of wrapper_msg */
+struct wrapper_msg {
+	struct list_head list;
+	struct kref ref_count;
+	u32 len; /* length of data to transfer */
+	struct wrapper_list *head;
+	union {
+		struct wire_msg msg;
+		struct wire_trans_hdr trans;
+	};
+};
+
+struct wrapper_list {
+	struct list_head list;
+	spinlock_t lock; /* Protects the list state during additions and removals */
+};
+
+struct wire_trans_passthrough {
+	struct wire_trans_hdr hdr;
+	u8 data[];
+} __packed;
+
+struct wire_addr_size_pair {
+	__le64 addr;
+	__le64 size;
+} __packed;
+
+struct wire_trans_dma_xfer {
+	struct wire_trans_hdr hdr;
+	__le32 tag;
+	__le32 count;
+	__le32 dma_chunk_id;
+	__le32 padding;
+	struct wire_addr_size_pair data[];
+} __packed;
+
+/* Initiated by device to continue the DMA xfer of a large piece of data */
+struct wire_trans_dma_xfer_cont {
+	struct wire_trans_hdr hdr;
+	__le32 dma_chunk_id;
+	__le32 padding;
+	__le64 xferred_size;
+} __packed;
+
+struct wire_trans_activate_to_dev {
+	struct wire_trans_hdr hdr;
+	__le64 req_q_addr;
+	__le64 rsp_q_addr;
+	__le32 req_q_size;
+	__le32 rsp_q_size;
+	__le32 buf_len;
+	__le32 options; /* unused, but BIT(16) has meaning to the device */
+} __packed;
+
+struct wire_trans_activate_from_dev {
+	struct wire_trans_hdr hdr;
+	__le32 status;
+	__le32 dbc_id;
+	__le64 options; /* unused */
+} __packed;
+
+struct wire_trans_deactivate_from_dev {
+	struct wire_trans_hdr hdr;
+	__le32 status;
+	__le32 dbc_id;
+} __packed;
+
+struct wire_trans_terminate_to_dev {
+	struct wire_trans_hdr hdr;
+	__le32 handle;
+	__le32 padding;
+} __packed;
+
+struct wire_trans_terminate_from_dev {
+	struct wire_trans_hdr hdr;
+	__le32 status;
+	__le32 padding;
+} __packed;
+
+struct wire_trans_status_to_dev {
+	struct wire_trans_hdr hdr;
+} __packed;
+
+struct wire_trans_status_from_dev {
+	struct wire_trans_hdr hdr;
+	__le16 major;
+	__le16 minor;
+	__le32 status;
+	__le64 status_flags;
+} __packed;
+
+struct wire_trans_validate_part_to_dev {
+	struct wire_trans_hdr hdr;
+	__le32 part_id;
+	__le32 padding;
+} __packed;
+
+struct wire_trans_validate_part_from_dev {
+	struct wire_trans_hdr hdr;
+	__le32 status;
+	__le32 padding;
+} __packed;
+
+struct xfer_queue_elem {
+	/*
+	 * Node in list of ongoing transfer request on control channel.
+	 * Maintained by root device struct.
+	 */
+	struct list_head list;
+	/* Sequence number of this transfer request */
+	u32 seq_num;
+	/* This is used to wait on until completion of transfer request */
+	struct completion xfer_done;
+	/* Received data from device */
+	void *buf;
+};
+
+struct dma_xfer {
+	/* Node in list of DMA transfers which is used for cleanup */
+	struct list_head list;
+	/* SG table of memory used for DMA */
+	struct sg_table *sgt;
+	/* Array pages used for DMA */
+	struct page **page_list;
+	/* Number of pages used for DMA */
+	unsigned long nr_pages;
+};
+
+struct ioctl_resources {
+	/* List of all DMA transfers which is used later for cleanup */
+	struct list_head dma_xfers;
+	/* Base address of request queue which belongs to a DBC */
+	void *buf;
+	/*
+	 * Base bus address of request queue which belongs to a DBC. Response
+	 * queue base bus address can be calculated by adding size of request
+	 * queue to base bus address of request queue.
+	 */
+	dma_addr_t dma_addr;
+	/* Total size of request queue and response queue in byte */
+	u32 total_size;
+	/* Total number of elements that can be queued in each of request and response queue */
+	u32 nelem;
+	/* Base address of response queue which belongs to a DBC */
+	void *rsp_q_base;
+	/* Status of the NNC message received */
+	u32 status;
+	/* DBC id of the DBC received from device */
+	u32 dbc_id;
+	/*
+	 * DMA transfer request messages can be big in size and it may not be
+	 * possible to send them in one shot. In such cases the messages are
+	 * broken into chunks, this field stores ID of such chunks.
+	 */
+	u32 dma_chunk_id;
+	/* Total number of bytes transferred for a DMA xfer request */
+	u64 xferred_dma_size;
+	/* Header of transaction message received from user. Used during DMA xfer request. */
+	void *trans_hdr;
+};
+
+struct resp_work {
+	struct work_struct work;
+	struct qaic_device *qdev;
+	void *buf;
+};
+
+/*
+ * Since we're working with little endian messages, its useful to be able to
+ * increment without filling a whole line with conversions back and forth just
+ * to add one(1) to a message count.
+ */
+static __le32 incr_le32(__le32 val)
+{
+	return cpu_to_le32(le32_to_cpu(val) + 1);
+}
+
+static u32 gen_crc(void *msg)
+{
+	struct wrapper_list *wrappers = msg;
+	struct wrapper_msg *w;
+	u32 crc = ~0;
+
+	list_for_each_entry(w, &wrappers->list, list)
+		crc = crc32(crc, &w->msg, w->len);
+
+	return crc ^ ~0;
+}
+
+static u32 gen_crc_stub(void *msg)
+{
+	return 0;
+}
+
+static bool valid_crc(void *msg)
+{
+	struct wire_msg_hdr *hdr = msg;
+	bool ret;
+	u32 crc;
+
+	/*
+	 * The output of this algorithm is always converted to the native
+	 * endianness.
+	 */
+	crc = le32_to_cpu(hdr->crc32);
+	hdr->crc32 = 0;
+	ret = (crc32(~0, msg, le32_to_cpu(hdr->len)) ^ ~0) == crc;
+	hdr->crc32 = cpu_to_le32(crc);
+	return ret;
+}
+
+static bool valid_crc_stub(void *msg)
+{
+	return true;
+}
+
+static void free_wrapper(struct kref *ref)
+{
+	struct wrapper_msg *wrapper = container_of(ref, struct wrapper_msg, ref_count);
+
+	list_del(&wrapper->list);
+	kfree(wrapper);
+}
+
+static void save_dbc_buf(struct qaic_device *qdev, struct ioctl_resources *resources,
+			 struct qaic_user *usr)
+{
+	u32 dbc_id = resources->dbc_id;
+
+	if (resources->buf) {
+		wait_event_interruptible(qdev->dbc[dbc_id].dbc_release, !qdev->dbc[dbc_id].in_use);
+		qdev->dbc[dbc_id].req_q_base = resources->buf;
+		qdev->dbc[dbc_id].rsp_q_base = resources->rsp_q_base;
+		qdev->dbc[dbc_id].dma_addr = resources->dma_addr;
+		qdev->dbc[dbc_id].total_size = resources->total_size;
+		qdev->dbc[dbc_id].nelem = resources->nelem;
+		enable_dbc(qdev, dbc_id, usr);
+		qdev->dbc[dbc_id].in_use = true;
+		resources->buf = NULL;
+		set_dbc_state(qdev, dbc_id, DBC_STATE_ASSIGNED);
+	}
+}
+
+static void free_dbc_buf(struct qaic_device *qdev, struct ioctl_resources *resources)
+{
+	if (resources->buf)
+		dma_free_coherent(&qdev->pdev->dev, resources->total_size, resources->buf,
+				  resources->dma_addr);
+	resources->buf = NULL;
+}
+
+static void free_dma_xfers(struct qaic_device *qdev, struct ioctl_resources *resources)
+{
+	struct dma_xfer *xfer;
+	struct dma_xfer *x;
+	int i;
+
+	list_for_each_entry_safe(xfer, x, &resources->dma_xfers, list) {
+		dma_unmap_sgtable(&qdev->pdev->dev, xfer->sgt, DMA_TO_DEVICE, 0);
+		sg_free_table(xfer->sgt);
+		kfree(xfer->sgt);
+		for (i = 0; i < xfer->nr_pages; ++i)
+			put_page(xfer->page_list[i]);
+		kfree(xfer->page_list);
+		list_del(&xfer->list);
+		kfree(xfer);
+	}
+}
+
+static struct wrapper_msg *add_wrapper(struct wrapper_list *wrappers, u32 size)
+{
+	struct wrapper_msg *w = kzalloc(size, GFP_KERNEL);
+
+	if (!w)
+		return NULL;
+	list_add_tail(&w->list, &wrappers->list);
+	kref_init(&w->ref_count);
+	w->head = wrappers;
+	return w;
+}
+
+static int encode_passthrough(struct qaic_device *qdev, void *trans, struct wrapper_list *wrappers,
+			      u32 *user_len)
+{
+	struct qaic_manage_trans_passthrough *in_trans = trans;
+	struct wire_trans_passthrough *out_trans;
+	struct wrapper_msg *trans_wrapper;
+	struct wrapper_msg *wrapper;
+	struct wire_msg *msg;
+	u32 msg_hdr_len;
+
+	wrapper = list_first_entry(&wrappers->list, struct wrapper_msg, list);
+	msg = &wrapper->msg;
+	msg_hdr_len = le32_to_cpu(msg->hdr.len);
+
+	if (in_trans->hdr.len % 8 != 0)
+		return -EINVAL;
+
+	if (size_add(msg_hdr_len, in_trans->hdr.len) > QAIC_MANAGE_WIRE_MSG_LENGTH)
+		return -ENOSPC;
+
+	trans_wrapper = add_wrapper(wrappers,
+				    offsetof(struct wrapper_msg, trans) + in_trans->hdr.len);
+	if (!trans_wrapper)
+		return -ENOMEM;
+	trans_wrapper->len = in_trans->hdr.len;
+	out_trans = (struct wire_trans_passthrough *)&trans_wrapper->trans;
+
+	memcpy(out_trans->data, in_trans->data, in_trans->hdr.len - sizeof(in_trans->hdr));
+	msg->hdr.len = cpu_to_le32(msg_hdr_len + in_trans->hdr.len);
+	msg->hdr.count = incr_le32(msg->hdr.count);
+	*user_len += in_trans->hdr.len;
+	out_trans->hdr.type = cpu_to_le32(QAIC_TRANS_PASSTHROUGH_TO_DEV);
+	out_trans->hdr.len = cpu_to_le32(in_trans->hdr.len);
+
+	return 0;
+}
+
+/* returns error code for failure, 0 if enough pages alloc'd, 1 if dma_cont is needed */
+static int find_and_map_user_pages(struct qaic_device *qdev,
+				   struct qaic_manage_trans_dma_xfer *in_trans,
+				   struct ioctl_resources *resources, struct dma_xfer *xfer)
+{
+	u64 xfer_start_addr, remaining, end, total;
+	unsigned long need_pages;
+	struct page **page_list;
+	unsigned long nr_pages;
+	struct sg_table *sgt;
+	int ret;
+	int i;
+
+	if (check_add_overflow(in_trans->addr, resources->xferred_dma_size, &xfer_start_addr))
+		return -EINVAL;
+
+	if (in_trans->size < resources->xferred_dma_size)
+		return -EINVAL;
+	remaining = in_trans->size - resources->xferred_dma_size;
+	if (remaining == 0)
+		return -EINVAL;
+
+	if (check_add_overflow(xfer_start_addr, remaining, &end))
+		return -EINVAL;
+
+	total = remaining + offset_in_page(xfer_start_addr);
+	if (total >= SIZE_MAX)
+		return -EINVAL;
+
+	need_pages = DIV_ROUND_UP(total, PAGE_SIZE);
+
+	nr_pages = need_pages;
+
+	while (1) {
+		page_list = kmalloc_objs(*page_list, nr_pages,
+					 GFP_KERNEL | __GFP_NOWARN);
+		if (!page_list) {
+			nr_pages = nr_pages / 2;
+			if (!nr_pages)
+				return -ENOMEM;
+		} else {
+			break;
+		}
+	}
+
+	ret = get_user_pages_fast(xfer_start_addr, nr_pages, 0, page_list);
+	if (ret < 0)
+		goto free_page_list;
+	if (ret != nr_pages) {
+		nr_pages = ret;
+		ret = -EFAULT;
+		goto put_pages;
+	}
+
+	sgt = kmalloc_obj(*sgt);
+	if (!sgt) {
+		ret = -ENOMEM;
+		goto put_pages;
+	}
+
+	ret = sg_alloc_table_from_pages(sgt, page_list, nr_pages,
+					offset_in_page(xfer_start_addr),
+					remaining, GFP_KERNEL);
+	if (ret) {
+		ret = -ENOMEM;
+		goto free_sgt;
+	}
+
+	ret = dma_map_sgtable(&qdev->pdev->dev, sgt, DMA_TO_DEVICE, 0);
+	if (ret)
+		goto free_table;
+
+	xfer->sgt = sgt;
+	xfer->page_list = page_list;
+	xfer->nr_pages = nr_pages;
+
+	return need_pages > nr_pages ? 1 : 0;
+
+free_table:
+	sg_free_table(sgt);
+free_sgt:
+	kfree(sgt);
+put_pages:
+	for (i = 0; i < nr_pages; ++i)
+		put_page(page_list[i]);
+free_page_list:
+	kfree(page_list);
+	return ret;
+}
+
+/* returns error code for failure, 0 if everything was encoded, 1 if dma_cont is needed */
+static int encode_addr_size_pairs(struct dma_xfer *xfer, struct wrapper_list *wrappers,
+				  struct ioctl_resources *resources, u32 msg_hdr_len, u32 *size,
+				  struct wire_trans_dma_xfer **out_trans)
+{
+	struct wrapper_msg *trans_wrapper;
+	struct sg_table *sgt = xfer->sgt;
+	struct wire_addr_size_pair *asp;
+	struct scatterlist *sg;
+	struct wrapper_msg *w;
+	unsigned int dma_len;
+	u64 dma_chunk_len;
+	void *boundary;
+	int nents_dma;
+	int nents;
+	int i;
+
+	nents = sgt->nents;
+	nents_dma = nents;
+	*size = QAIC_MANAGE_WIRE_MSG_LENGTH - msg_hdr_len - sizeof(**out_trans);
+	for_each_sgtable_dma_sg(sgt, sg, i) {
+		*size -= sizeof(*asp);
+		/* Save 1K for possible follow-up transactions. */
+		if (*size < SZ_1K) {
+			nents_dma = i;
+			break;
+		}
+	}
+
+	trans_wrapper = add_wrapper(wrappers, QAIC_WRAPPER_MAX_SIZE);
+	if (!trans_wrapper)
+		return -ENOMEM;
+	*out_trans = (struct wire_trans_dma_xfer *)&trans_wrapper->trans;
+
+	asp = (*out_trans)->data;
+	boundary = (void *)trans_wrapper + QAIC_WRAPPER_MAX_SIZE;
+	*size = 0;
+
+	dma_len = 0;
+	w = trans_wrapper;
+	dma_chunk_len = 0;
+	for_each_sg(sgt->sgl, sg, nents_dma, i) {
+		asp->size = cpu_to_le64(dma_len);
+		dma_chunk_len += dma_len;
+		if (dma_len) {
+			asp++;
+			if ((void *)asp + sizeof(*asp) > boundary) {
+				w->len = (void *)asp - (void *)&w->msg;
+				*size += w->len;
+				w = add_wrapper(wrappers, QAIC_WRAPPER_MAX_SIZE);
+				if (!w)
+					return -ENOMEM;
+				boundary = (void *)w + QAIC_WRAPPER_MAX_SIZE;
+				asp = (struct wire_addr_size_pair *)&w->msg;
+			}
+		}
+		asp->addr = cpu_to_le64(sg_dma_address(sg));
+		dma_len = sg_dma_len(sg);
+	}
+	/* finalize the last segment */
+	asp->size = cpu_to_le64(dma_len);
+	w->len = (void *)asp + sizeof(*asp) - (void *)&w->msg;
+	*size += w->len;
+	dma_chunk_len += dma_len;
+	resources->xferred_dma_size += dma_chunk_len;
+
+	return nents_dma < nents ? 1 : 0;
+}
+
+static void cleanup_xfer(struct qaic_device *qdev, struct dma_xfer *xfer)
+{
+	int i;
+
+	dma_unmap_sgtable(&qdev->pdev->dev, xfer->sgt, DMA_TO_DEVICE, 0);
+	sg_free_table(xfer->sgt);
+	kfree(xfer->sgt);
+	for (i = 0; i < xfer->nr_pages; ++i)
+		put_page(xfer->page_list[i]);
+	kfree(xfer->page_list);
+}
+
+static int encode_dma(struct qaic_device *qdev, void *trans, struct wrapper_list *wrappers,
+		      u32 *user_len, struct ioctl_resources *resources, struct qaic_user *usr)
+{
+	struct qaic_manage_trans_dma_xfer *in_trans = trans;
+	struct wire_trans_dma_xfer *out_trans;
+	struct wrapper_msg *wrapper;
+	struct dma_xfer *xfer;
+	struct wire_msg *msg;
+	bool need_cont_dma;
+	u32 msg_hdr_len;
+	u32 size;
+	int ret;
+
+	wrapper = list_first_entry(&wrappers->list, struct wrapper_msg, list);
+	msg = &wrapper->msg;
+	msg_hdr_len = le32_to_cpu(msg->hdr.len);
+
+	/* There should be enough space to hold at least one ASP entry. */
+	if (size_add(msg_hdr_len, sizeof(*out_trans) + sizeof(struct wire_addr_size_pair)) >
+	    QAIC_MANAGE_WIRE_MSG_LENGTH)
+		return -ENOMEM;
+
+	xfer = kmalloc_obj(*xfer);
+	if (!xfer)
+		return -ENOMEM;
+
+	ret = find_and_map_user_pages(qdev, in_trans, resources, xfer);
+	if (ret < 0)
+		goto free_xfer;
+
+	need_cont_dma = (bool)ret;
+
+	ret = encode_addr_size_pairs(xfer, wrappers, resources, msg_hdr_len, &size, &out_trans);
+	if (ret < 0)
+		goto cleanup_xfer;
+
+	need_cont_dma = need_cont_dma || (bool)ret;
+
+	msg->hdr.len = cpu_to_le32(msg_hdr_len + size);
+	msg->hdr.count = incr_le32(msg->hdr.count);
+
+	out_trans->hdr.type = cpu_to_le32(QAIC_TRANS_DMA_XFER_TO_DEV);
+	out_trans->hdr.len = cpu_to_le32(size);
+	out_trans->tag = cpu_to_le32(in_trans->tag);
+	out_trans->count = cpu_to_le32((size - sizeof(*out_trans)) /
+								sizeof(struct wire_addr_size_pair));
+
+	*user_len += in_trans->hdr.len;
+
+	if (resources->dma_chunk_id) {
+		out_trans->dma_chunk_id = cpu_to_le32(resources->dma_chunk_id);
+	} else if (need_cont_dma) {
+		while (resources->dma_chunk_id == 0)
+			resources->dma_chunk_id = atomic_inc_return(&usr->chunk_id);
+
+		out_trans->dma_chunk_id = cpu_to_le32(resources->dma_chunk_id);
+	}
+	resources->trans_hdr = trans;
+
+	list_add(&xfer->list, &resources->dma_xfers);
+	return 0;
+
+cleanup_xfer:
+	cleanup_xfer(qdev, xfer);
+free_xfer:
+	kfree(xfer);
+	return ret;
+}
+
+static int encode_activate(struct qaic_device *qdev, void *trans, struct wrapper_list *wrappers,
+			   u32 *user_len, struct ioctl_resources *resources)
+{
+	struct qaic_manage_trans_activate_to_dev *in_trans = trans;
+	struct wire_trans_activate_to_dev *out_trans;
+	struct wrapper_msg *trans_wrapper;
+	struct wrapper_msg *wrapper;
+	struct wire_msg *msg;
+	dma_addr_t dma_addr;
+	u32 msg_hdr_len;
+	void *buf;
+	u32 nelem;
+	u32 size;
+	int ret;
+
+	wrapper = list_first_entry(&wrappers->list, struct wrapper_msg, list);
+	msg = &wrapper->msg;
+	msg_hdr_len = le32_to_cpu(msg->hdr.len);
+
+	if (size_add(msg_hdr_len, sizeof(*out_trans)) > QAIC_MANAGE_WIRE_MSG_LENGTH)
+		return -ENOSPC;
+
+	if (!in_trans->queue_size)
+		return -EINVAL;
+
+	if (in_trans->pad)
+		return -EINVAL;
+
+	nelem = in_trans->queue_size;
+	if (check_mul_overflow((u32)(get_dbc_req_elem_size() + get_dbc_rsp_elem_size()),
+			       nelem,
+			       &size))
+		return -EINVAL;
+
+	if (size + QAIC_DBC_Q_GAP + QAIC_DBC_Q_BUF_ALIGN < size)
+		return -EINVAL;
+
+	size = ALIGN((size + QAIC_DBC_Q_GAP), QAIC_DBC_Q_BUF_ALIGN);
+
+	buf = dma_alloc_coherent(&qdev->pdev->dev, size, &dma_addr, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	trans_wrapper = add_wrapper(wrappers,
+				    offsetof(struct wrapper_msg, trans) + sizeof(*out_trans));
+	if (!trans_wrapper) {
+		ret = -ENOMEM;
+		goto free_dma;
+	}
+	trans_wrapper->len = sizeof(*out_trans);
+	out_trans = (struct wire_trans_activate_to_dev *)&trans_wrapper->trans;
+
+	out_trans->hdr.type = cpu_to_le32(QAIC_TRANS_ACTIVATE_TO_DEV);
+	out_trans->hdr.len = cpu_to_le32(sizeof(*out_trans));
+	out_trans->buf_len = cpu_to_le32(size);
+	out_trans->req_q_addr = cpu_to_le64(dma_addr);
+	out_trans->req_q_size = cpu_to_le32(nelem);
+	out_trans->rsp_q_addr = cpu_to_le64(dma_addr + size - nelem * get_dbc_rsp_elem_size());
+	out_trans->rsp_q_size = cpu_to_le32(nelem);
+	out_trans->options = cpu_to_le32(in_trans->options);
+
+	*user_len += in_trans->hdr.len;
+	msg->hdr.len = cpu_to_le32(msg_hdr_len + sizeof(*out_trans));
+	msg->hdr.count = incr_le32(msg->hdr.count);
+
+	resources->buf = buf;
+	resources->dma_addr = dma_addr;
+	resources->total_size = size;
+	resources->nelem = nelem;
+	resources->rsp_q_base = buf + size - nelem * get_dbc_rsp_elem_size();
+	return 0;
+
+free_dma:
+	dma_free_coherent(&qdev->pdev->dev, size, buf, dma_addr);
+	return ret;
+}
+
+static int encode_deactivate(struct qaic_device *qdev, void *trans,
+			     u32 *user_len, struct qaic_user *usr)
+{
+	struct qaic_manage_trans_deactivate *in_trans = trans;
+
+	if (in_trans->dbc_id >= qdev->num_dbc || in_trans->pad)
+		return -EINVAL;
+
+	*user_len += in_trans->hdr.len;
+
+	return disable_dbc(qdev, in_trans->dbc_id, usr);
+}
+
+static int encode_status(struct qaic_device *qdev, void *trans, struct wrapper_list *wrappers,
+			 u32 *user_len)
+{
+	struct qaic_manage_trans_status_to_dev *in_trans = trans;
+	struct wire_trans_status_to_dev *out_trans;
+	struct wrapper_msg *trans_wrapper;
+	struct wrapper_msg *wrapper;
+	struct wire_msg *msg;
+	u32 msg_hdr_len;
+
+	wrapper = list_first_entry(&wrappers->list, struct wrapper_msg, list);
+	msg = &wrapper->msg;
+	msg_hdr_len = le32_to_cpu(msg->hdr.len);
+
+	if (size_add(msg_hdr_len, in_trans->hdr.len) > QAIC_MANAGE_WIRE_MSG_LENGTH)
+		return -ENOSPC;
+
+	trans_wrapper = add_wrapper(wrappers, sizeof(*trans_wrapper));
+	if (!trans_wrapper)
+		return -ENOMEM;
+
+	trans_wrapper->len = sizeof(*out_trans);
+	out_trans = (struct wire_trans_status_to_dev *)&trans_wrapper->trans;
+
+	out_trans->hdr.type = cpu_to_le32(QAIC_TRANS_STATUS_TO_DEV);
+	out_trans->hdr.len = cpu_to_le32(in_trans->hdr.len);
+	msg->hdr.len = cpu_to_le32(msg_hdr_len + in_trans->hdr.len);
+	msg->hdr.count = incr_le32(msg->hdr.count);
+	*user_len += in_trans->hdr.len;
+
+	return 0;
+}
+
+static int encode_message(struct qaic_device *qdev, struct manage_msg *user_msg,
+			  struct wrapper_list *wrappers, struct ioctl_resources *resources,
+			  struct qaic_user *usr)
+{
+	struct qaic_manage_trans_hdr *trans_hdr;
+	struct wrapper_msg *wrapper;
+	struct wire_msg *msg;
+	u32 user_len = 0;
+	int ret;
+	int i;
+
+	if (!user_msg->count ||
+	    user_msg->len < sizeof(*trans_hdr)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	wrapper = list_first_entry(&wrappers->list, struct wrapper_msg, list);
+	msg = &wrapper->msg;
+
+	msg->hdr.len = cpu_to_le32(sizeof(msg->hdr));
+
+	if (resources->dma_chunk_id) {
+		ret = encode_dma(qdev, resources->trans_hdr, wrappers, &user_len, resources, usr);
+		msg->hdr.count = cpu_to_le32(1);
+		goto out;
+	}
+
+	for (i = 0; i < user_msg->count; ++i) {
+		if (user_len > user_msg->len - sizeof(*trans_hdr)) {
+			ret = -EINVAL;
+			break;
+		}
+		trans_hdr = (struct qaic_manage_trans_hdr *)(user_msg->data + user_len);
+		if (trans_hdr->len < sizeof(trans_hdr) ||
+		    size_add(user_len, trans_hdr->len) > user_msg->len) {
+			ret = -EINVAL;
+			break;
+		}
+
+		switch (trans_hdr->type) {
+		case QAIC_TRANS_PASSTHROUGH_FROM_USR:
+			ret = encode_passthrough(qdev, trans_hdr, wrappers, &user_len);
+			break;
+		case QAIC_TRANS_DMA_XFER_FROM_USR:
+			ret = encode_dma(qdev, trans_hdr, wrappers, &user_len, resources, usr);
+			break;
+		case QAIC_TRANS_ACTIVATE_FROM_USR:
+			ret = encode_activate(qdev, trans_hdr, wrappers, &user_len, resources);
+			break;
+		case QAIC_TRANS_DEACTIVATE_FROM_USR:
+			ret = encode_deactivate(qdev, trans_hdr, &user_len, usr);
+			break;
+		case QAIC_TRANS_STATUS_FROM_USR:
+			ret = encode_status(qdev, trans_hdr, wrappers, &user_len);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+
+		if (ret)
+			goto out;
+	}
+
+	if (user_len != user_msg->len)
+		ret = -EINVAL;
+out:
+	if (ret) {
+		free_dma_xfers(qdev, resources);
+		free_dbc_buf(qdev, resources);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int decode_passthrough(struct qaic_device *qdev, void *trans, struct manage_msg *user_msg,
+			      u32 *msg_len)
+{
+	struct qaic_manage_trans_passthrough *out_trans;
+	struct wire_trans_passthrough *in_trans = trans;
+	u32 len;
+
+	out_trans = (void *)user_msg->data + user_msg->len;
+
+	len = le32_to_cpu(in_trans->hdr.len);
+	if (len % 8 != 0)
+		return -EINVAL;
+
+	if (user_msg->len + len > QAIC_MANAGE_MAX_MSG_LENGTH)
+		return -ENOSPC;
+
+	memcpy(out_trans->data, in_trans->data, len - sizeof(in_trans->hdr));
+	user_msg->len += len;
+	*msg_len += len;
+	out_trans->hdr.type = le32_to_cpu(in_trans->hdr.type);
+	out_trans->hdr.len = len;
+
+	return 0;
+}
+
+static int decode_activate(struct qaic_device *qdev, void *trans, struct manage_msg *user_msg,
+			   u32 *msg_len, struct ioctl_resources *resources, struct qaic_user *usr)
+{
+	struct qaic_manage_trans_activate_from_dev *out_trans;
+	struct wire_trans_activate_from_dev *in_trans = trans;
+	u32 len;
+
+	out_trans = (void *)user_msg->data + user_msg->len;
+
+	len = le32_to_cpu(in_trans->hdr.len);
+	if (user_msg->len + len > QAIC_MANAGE_MAX_MSG_LENGTH)
+		return -ENOSPC;
+
+	user_msg->len += len;
+	*msg_len += len;
+	out_trans->hdr.type = le32_to_cpu(in_trans->hdr.type);
+	out_trans->hdr.len = len;
+	out_trans->status = le32_to_cpu(in_trans->status);
+	out_trans->dbc_id = le32_to_cpu(in_trans->dbc_id);
+	out_trans->options = le64_to_cpu(in_trans->options);
+
+	if (!resources->buf)
+		/* how did we get an activate response without a request? */
+		return -EINVAL;
+
+	if (out_trans->dbc_id >= qdev->num_dbc)
+		/*
+		 * The device assigned an invalid resource, which should never
+		 * happen. Return an error so the user can try to recover.
+		 */
+		return -ENODEV;
+
+	if (out_trans->status)
+		/*
+		 * Allocating resources failed on device side. This is not an
+		 * expected behaviour, user is expected to handle this situation.
+		 */
+		return -ECANCELED;
+
+	resources->status = out_trans->status;
+	resources->dbc_id = out_trans->dbc_id;
+	save_dbc_buf(qdev, resources, usr);
+
+	return 0;
+}
+
+static int decode_deactivate(struct qaic_device *qdev, void *trans, u32 *msg_len,
+			     struct qaic_user *usr)
+{
+	struct wire_trans_deactivate_from_dev *in_trans = trans;
+	u32 dbc_id = le32_to_cpu(in_trans->dbc_id);
+	u32 status = le32_to_cpu(in_trans->status);
+
+	if (dbc_id >= qdev->num_dbc)
+		/*
+		 * The device assigned an invalid resource, which should never
+		 * happen. Inject an error so the user can try to recover.
+		 */
+		return -ENODEV;
+
+	if (usr && status) {
+		/*
+		 * Releasing resources failed on the device side, which puts
+		 * us in a bind since they may still be in use, so enable the
+		 * dbc. User is expected to retry deactivation.
+		 */
+		enable_dbc(qdev, dbc_id, usr);
+		return -ECANCELED;
+	}
+
+	release_dbc(qdev, dbc_id);
+	set_dbc_state(qdev, dbc_id, DBC_STATE_IDLE);
+	*msg_len += sizeof(*in_trans);
+
+	return 0;
+}
+
+static int decode_status(struct qaic_device *qdev, void *trans, struct manage_msg *user_msg,
+			 u32 *user_len, struct wire_msg *msg)
+{
+	struct qaic_manage_trans_status_from_dev *out_trans;
+	struct wire_trans_status_from_dev *in_trans = trans;
+	u32 len;
+
+	out_trans = (void *)user_msg->data + user_msg->len;
+
+	len = le32_to_cpu(in_trans->hdr.len);
+	if (user_msg->len + len > QAIC_MANAGE_MAX_MSG_LENGTH)
+		return -ENOSPC;
+
+	out_trans->hdr.type = QAIC_TRANS_STATUS_FROM_DEV;
+	out_trans->hdr.len = len;
+	out_trans->major = le16_to_cpu(in_trans->major);
+	out_trans->minor = le16_to_cpu(in_trans->minor);
+	out_trans->status_flags = le64_to_cpu(in_trans->status_flags);
+	out_trans->status = le32_to_cpu(in_trans->status);
+	*user_len += le32_to_cpu(in_trans->hdr.len);
+	user_msg->len += len;
+
+	if (out_trans->status)
+		return -ECANCELED;
+	if (out_trans->status_flags & BIT(0) && !valid_crc(msg))
+		return -EPIPE;
+
+	return 0;
+}
+
+static int decode_message(struct qaic_device *qdev, struct manage_msg *user_msg,
+			  struct wire_msg *msg, struct ioctl_resources *resources,
+			  struct qaic_user *usr)
+{
+	u32 msg_hdr_len = le32_to_cpu(msg->hdr.len);
+	struct wire_trans_hdr *trans_hdr;
+	u32 msg_len = 0;
+	int ret;
+	int i;
+
+	if (msg_hdr_len < sizeof(*trans_hdr) ||
+	    msg_hdr_len > QAIC_MANAGE_MAX_MSG_LENGTH)
+		return -EINVAL;
+
+	user_msg->len = 0;
+	user_msg->count = le32_to_cpu(msg->hdr.count);
+
+	for (i = 0; i < user_msg->count; ++i) {
+		u32 hdr_len;
+
+		if (msg_len > msg_hdr_len - sizeof(*trans_hdr))
+			return -EINVAL;
+
+		trans_hdr = (struct wire_trans_hdr *)(msg->data + msg_len);
+		hdr_len = le32_to_cpu(trans_hdr->len);
+		if (hdr_len < sizeof(*trans_hdr) ||
+		    size_add(msg_len, hdr_len) > msg_hdr_len)
+			return -EINVAL;
+
+		switch (le32_to_cpu(trans_hdr->type)) {
+		case QAIC_TRANS_PASSTHROUGH_FROM_DEV:
+			ret = decode_passthrough(qdev, trans_hdr, user_msg, &msg_len);
+			break;
+		case QAIC_TRANS_ACTIVATE_FROM_DEV:
+			ret = decode_activate(qdev, trans_hdr, user_msg, &msg_len, resources, usr);
+			break;
+		case QAIC_TRANS_DEACTIVATE_FROM_DEV:
+			ret = decode_deactivate(qdev, trans_hdr, &msg_len, usr);
+			break;
+		case QAIC_TRANS_STATUS_FROM_DEV:
+			ret = decode_status(qdev, trans_hdr, user_msg, &msg_len, msg);
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		if (ret)
+			return ret;
+	}
+
+	if (msg_len != (msg_hdr_len - sizeof(msg->hdr)))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void *msg_xfer(struct qaic_device *qdev, struct wrapper_list *wrappers, u32 seq_num,
+		      bool ignore_signal)
+{
+	struct xfer_queue_elem elem;
+	struct wire_msg *out_buf;
+	struct wrapper_msg *w;
+	long ret = -EAGAIN;
+	int xfer_count = 0;
+	int retry_count;
+
+	/* Allow QAIC_BOOT state since we need to check control protocol version */
+	if (qdev->dev_state == QAIC_OFFLINE) {
+		mutex_unlock(&qdev->cntl_mutex);
+		return ERR_PTR(-ENODEV);
+	}
+
+	/* Attempt to avoid a partial commit of a message */
+	list_for_each_entry(w, &wrappers->list, list)
+		xfer_count++;
+
+	for (retry_count = 0; retry_count < QAIC_MHI_RETRY_MAX; retry_count++) {
+		if (xfer_count <= mhi_get_free_desc_count(qdev->cntl_ch, DMA_TO_DEVICE)) {
+			ret = 0;
+			break;
+		}
+		msleep_interruptible(QAIC_MHI_RETRY_WAIT_MS);
+		if (signal_pending(current))
+			break;
+	}
+
+	if (ret) {
+		mutex_unlock(&qdev->cntl_mutex);
+		return ERR_PTR(ret);
+	}
+
+	elem.seq_num = seq_num;
+	elem.buf = NULL;
+	init_completion(&elem.xfer_done);
+	if (likely(!qdev->cntl_lost_buf)) {
+		/*
+		 * The max size of request to device is QAIC_MANAGE_WIRE_MSG_LENGTH.
+		 * The max size of response from device is QAIC_MANAGE_MAX_MSG_LENGTH.
+		 */
+		out_buf = kmalloc(QAIC_MANAGE_MAX_MSG_LENGTH, GFP_KERNEL);
+		if (!out_buf) {
+			mutex_unlock(&qdev->cntl_mutex);
+			return ERR_PTR(-ENOMEM);
+		}
+
+		ret = mhi_queue_buf(qdev->cntl_ch, DMA_FROM_DEVICE, out_buf,
+				    QAIC_MANAGE_MAX_MSG_LENGTH, MHI_EOT);
+		if (ret) {
+			mutex_unlock(&qdev->cntl_mutex);
+			return ERR_PTR(ret);
+		}
+	} else {
+		/*
+		 * we lost a buffer because we queued a recv buf, but then
+		 * queuing the corresponding tx buf failed. To try to avoid
+		 * a memory leak, lets reclaim it and use it for this
+		 * transaction.
+		 */
+		qdev->cntl_lost_buf = false;
+	}
+
+	list_for_each_entry(w, &wrappers->list, list) {
+		kref_get(&w->ref_count);
+		ret = mhi_queue_buf(qdev->cntl_ch, DMA_TO_DEVICE, &w->msg, w->len,
+				    list_is_last(&w->list, &wrappers->list) ? MHI_EOT : MHI_CHAIN);
+		if (ret) {
+			qdev->cntl_lost_buf = true;
+			kref_put(&w->ref_count, free_wrapper);
+			mutex_unlock(&qdev->cntl_mutex);
+			return ERR_PTR(ret);
+		}
+	}
+
+	list_add_tail(&elem.list, &qdev->cntl_xfer_list);
+	mutex_unlock(&qdev->cntl_mutex);
+
+	if (ignore_signal)
+		ret = wait_for_completion_timeout(&elem.xfer_done, control_resp_timeout_s * HZ);
+	else
+		ret = wait_for_completion_interruptible_timeout(&elem.xfer_done,
+								control_resp_timeout_s * HZ);
+	/*
+	 * not using _interruptable because we have to cleanup or we'll
+	 * likely cause memory corruption
+	 */
+	mutex_lock(&qdev->cntl_mutex);
+	if (!list_empty(&elem.list))
+		list_del(&elem.list);
+	/* resp_worker() processed the response but the wait was interrupted */
+	else if (ret == -ERESTARTSYS)
+		ret = 0;
+	if (!ret && !elem.buf)
+		ret = -ETIMEDOUT;
+	else if (ret > 0 && !elem.buf)
+		ret = -EIO;
+	mutex_unlock(&qdev->cntl_mutex);
+
+	if (ret < 0) {
+		kfree(elem.buf);
+		return ERR_PTR(ret);
+	} else if (!qdev->valid_crc(elem.buf)) {
+		kfree(elem.buf);
+		return ERR_PTR(-EPIPE);
+	}
+
+	return elem.buf;
+}
+
+/* Add a transaction to abort the outstanding DMA continuation */
+static int abort_dma_cont(struct qaic_device *qdev, struct wrapper_list *wrappers, u32 dma_chunk_id)
+{
+	struct wire_trans_dma_xfer *out_trans;
+	u32 size = sizeof(*out_trans);
+	struct wrapper_msg *wrapper;
+	struct wrapper_msg *w;
+	struct wire_msg *msg;
+
+	wrapper = list_first_entry(&wrappers->list, struct wrapper_msg, list);
+	msg = &wrapper->msg;
+
+	/* Remove all but the first wrapper which has the msg header */
+	list_for_each_entry_safe(wrapper, w, &wrappers->list, list)
+		if (!list_is_first(&wrapper->list, &wrappers->list))
+			kref_put(&wrapper->ref_count, free_wrapper);
+
+	wrapper = add_wrapper(wrappers, sizeof(*wrapper));
+
+	if (!wrapper)
+		return -ENOMEM;
+
+	out_trans = (struct wire_trans_dma_xfer *)&wrapper->trans;
+	out_trans->hdr.type = cpu_to_le32(QAIC_TRANS_DMA_XFER_TO_DEV);
+	out_trans->hdr.len = cpu_to_le32(size);
+	out_trans->tag = cpu_to_le32(0);
+	out_trans->count = cpu_to_le32(0);
+	out_trans->dma_chunk_id = cpu_to_le32(dma_chunk_id);
+
+	msg->hdr.len = cpu_to_le32(size + sizeof(*msg));
+	msg->hdr.count = cpu_to_le32(1);
+	wrapper->len = size;
+
+	return 0;
+}
+
+static struct wrapper_list *alloc_wrapper_list(void)
+{
+	struct wrapper_list *wrappers;
+
+	wrappers = kmalloc_obj(*wrappers);
+	if (!wrappers)
+		return NULL;
+	INIT_LIST_HEAD(&wrappers->list);
+	spin_lock_init(&wrappers->lock);
+
+	return wrappers;
+}
+
+static int qaic_manage_msg_xfer(struct qaic_device *qdev, struct qaic_user *usr,
+				struct manage_msg *user_msg, struct ioctl_resources *resources,
+				struct wire_msg **rsp)
+{
+	struct wrapper_list *wrappers;
+	struct wrapper_msg *wrapper;
+	struct wrapper_msg *w;
+	bool all_done = false;
+	struct wire_msg *msg;
+	int ret;
+
+	wrappers = alloc_wrapper_list();
+	if (!wrappers)
+		return -ENOMEM;
+
+	wrapper = add_wrapper(wrappers, sizeof(*wrapper));
+	if (!wrapper) {
+		kfree(wrappers);
+		return -ENOMEM;
+	}
+
+	msg = &wrapper->msg;
+	wrapper->len = sizeof(*msg);
+
+	ret = encode_message(qdev, user_msg, wrappers, resources, usr);
+	if (ret && resources->dma_chunk_id)
+		ret = abort_dma_cont(qdev, wrappers, resources->dma_chunk_id);
+	if (ret)
+		goto encode_failed;
+
+	ret = mutex_lock_interruptible(&qdev->cntl_mutex);
+	if (ret)
+		goto lock_failed;
+
+	msg->hdr.magic_number = MANAGE_MAGIC_NUMBER;
+	msg->hdr.sequence_number = cpu_to_le32(qdev->next_seq_num++);
+
+	if (usr) {
+		msg->hdr.handle = cpu_to_le32(usr->handle);
+		msg->hdr.partition_id = cpu_to_le32(usr->qddev->partition_id);
+	} else {
+		msg->hdr.handle = 0;
+		msg->hdr.partition_id = cpu_to_le32(QAIC_NO_PARTITION);
+	}
+
+	msg->hdr.padding = cpu_to_le32(0);
+	msg->hdr.crc32 = cpu_to_le32(qdev->gen_crc(wrappers));
+
+	/* msg_xfer releases the mutex */
+	*rsp = msg_xfer(qdev, wrappers, qdev->next_seq_num - 1, false);
+	if (IS_ERR(*rsp))
+		ret = PTR_ERR(*rsp);
+
+lock_failed:
+	free_dma_xfers(qdev, resources);
+encode_failed:
+	spin_lock(&wrappers->lock);
+	list_for_each_entry_safe(wrapper, w, &wrappers->list, list)
+		kref_put(&wrapper->ref_count, free_wrapper);
+	all_done = list_empty(&wrappers->list);
+	spin_unlock(&wrappers->lock);
+	if (all_done)
+		kfree(wrappers);
+
+	return ret;
+}
+
+static int qaic_manage(struct qaic_device *qdev, struct qaic_user *usr, struct manage_msg *user_msg)
+{
+	struct wire_trans_dma_xfer_cont *dma_cont = NULL;
+	struct ioctl_resources resources;
+	struct wire_msg *rsp = NULL;
+	int ret;
+
+	memset(&resources, 0, sizeof(struct ioctl_resources));
+
+	INIT_LIST_HEAD(&resources.dma_xfers);
+
+	if (user_msg->len > QAIC_MANAGE_MAX_MSG_LENGTH ||
+	    user_msg->count > QAIC_MANAGE_MAX_MSG_LENGTH / sizeof(struct qaic_manage_trans_hdr))
+		return -EINVAL;
+
+dma_xfer_continue:
+	ret = qaic_manage_msg_xfer(qdev, usr, user_msg, &resources, &rsp);
+	if (ret)
+		return ret;
+	/* dma_cont should be the only transaction if present */
+	if (le32_to_cpu(rsp->hdr.count) == 1) {
+		dma_cont = (struct wire_trans_dma_xfer_cont *)rsp->data;
+		if (le32_to_cpu(dma_cont->hdr.type) != QAIC_TRANS_DMA_XFER_CONT)
+			dma_cont = NULL;
+	}
+	if (dma_cont) {
+		if (le32_to_cpu(dma_cont->dma_chunk_id) == resources.dma_chunk_id &&
+		    le64_to_cpu(dma_cont->xferred_size) == resources.xferred_dma_size) {
+			kfree(rsp);
+			goto dma_xfer_continue;
+		}
+
+		ret = -EINVAL;
+		goto dma_cont_failed;
+	}
+
+	ret = decode_message(qdev, user_msg, rsp, &resources, usr);
+
+dma_cont_failed:
+	free_dbc_buf(qdev, &resources);
+	kfree(rsp);
+	return ret;
+}
+
+int qaic_manage_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct qaic_manage_msg *user_msg = data;
+	struct qaic_device *qdev;
+	struct manage_msg *msg;
+	struct qaic_user *usr;
+	u8 __user *user_data;
+	int qdev_rcu_id;
+	int usr_rcu_id;
+	int ret;
+
+	if (user_msg->len > QAIC_MANAGE_MAX_MSG_LENGTH)
+		return -EINVAL;
+
+	usr = file_priv->driver_priv;
+
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+		return -ENODEV;
+	}
+
+	qdev = usr->qddev->qdev;
+
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+		srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+		return -ENODEV;
+	}
+
+	msg = kzalloc(QAIC_MANAGE_MAX_MSG_LENGTH + sizeof(*msg), GFP_KERNEL);
+	if (!msg) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	msg->len = user_msg->len;
+	msg->count = user_msg->count;
+
+	user_data = u64_to_user_ptr(user_msg->data);
+
+	if (copy_from_user(msg->data, user_data, user_msg->len)) {
+		ret = -EFAULT;
+		goto free_msg;
+	}
+
+	ret = qaic_manage(qdev, usr, msg);
+
+	/*
+	 * If the qaic_manage() is successful then we copy the message onto
+	 * userspace memory but we have an exception for -ECANCELED.
+	 * For -ECANCELED, it means that device has NACKed the message with a
+	 * status error code which userspace would like to know.
+	 */
+	if (ret == -ECANCELED || !ret) {
+		if (copy_to_user(user_data, msg->data, msg->len)) {
+			ret = -EFAULT;
+		} else {
+			user_msg->len = msg->len;
+			user_msg->count = msg->count;
+		}
+	}
+
+free_msg:
+	kfree(msg);
+out:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	return ret;
+}
+
+int get_cntl_version(struct qaic_device *qdev, struct qaic_user *usr, u16 *major, u16 *minor)
+{
+	struct qaic_manage_trans_status_from_dev *status_result;
+	struct qaic_manage_trans_status_to_dev *status_query;
+	struct manage_msg *user_msg;
+	int ret;
+
+	user_msg = kmalloc(sizeof(*user_msg) + sizeof(*status_result), GFP_KERNEL);
+	if (!user_msg) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	user_msg->len = sizeof(*status_query);
+	user_msg->count = 1;
+
+	status_query = (struct qaic_manage_trans_status_to_dev *)user_msg->data;
+	status_query->hdr.type = QAIC_TRANS_STATUS_FROM_USR;
+	status_query->hdr.len = sizeof(status_query->hdr);
+
+	ret = qaic_manage(qdev, usr, user_msg);
+	if (ret)
+		goto kfree_user_msg;
+	status_result = (struct qaic_manage_trans_status_from_dev *)user_msg->data;
+	*major = status_result->major;
+	*minor = status_result->minor;
+
+	if (status_result->status_flags & BIT(0)) { /* device is using CRC */
+		/* By default qdev->gen_crc is programmed to generate CRC */
+		qdev->valid_crc = valid_crc;
+	} else {
+		/* By default qdev->valid_crc is programmed to bypass CRC */
+		qdev->gen_crc = gen_crc_stub;
+	}
+
+kfree_user_msg:
+	kfree(user_msg);
+out:
+	return ret;
+}
+
+static void resp_worker(struct work_struct *work)
+{
+	struct resp_work *resp = container_of(work, struct resp_work, work);
+	struct qaic_device *qdev = resp->qdev;
+	struct wire_msg *msg = resp->buf;
+	struct xfer_queue_elem *elem;
+	struct xfer_queue_elem *i;
+	bool found = false;
+
+	mutex_lock(&qdev->cntl_mutex);
+	list_for_each_entry_safe(elem, i, &qdev->cntl_xfer_list, list) {
+		if (elem->seq_num == le32_to_cpu(msg->hdr.sequence_number)) {
+			found = true;
+			list_del_init(&elem->list);
+			elem->buf = msg;
+			complete_all(&elem->xfer_done);
+			break;
+		}
+	}
+	mutex_unlock(&qdev->cntl_mutex);
+
+	if (!found) {
+		/*
+		 * The user might have gone away at this point without waiting
+		 * for QAIC_TRANS_DEACTIVATE_FROM_DEV transaction coming from
+		 * the device. If this is not handled correctly, the host will
+		 * not know that the DBC[n] has been freed on the device.
+		 * Due to this failure in synchronization between the device and
+		 * the host, if another user requests to activate a network, and
+		 * the device assigns DBC[n] again, save_dbc_buf() will hang,
+		 * waiting for dbc[n]->in_use to be set to false, which will not
+		 * happen unless the qaic_dev_reset_clean_local_state() gets
+		 * called by resetting the device (or re-inserting the module).
+		 *
+		 * As a solution, we look for QAIC_TRANS_DEACTIVATE_FROM_DEV
+		 * transactions in the message before disposing of it, then
+		 * handle releasing the DBC resources.
+		 *
+		 * Since the user has gone away, if the device could not
+		 * deactivate the network (status != 0), there is no way to
+		 * enable and reassign the DBC to the user. We can put trust in
+		 * the device that it will release all the active DBCs in
+		 * response to the QAIC_TRANS_TERMINATE_TO_DEV transaction,
+		 * otherwise, the user can issue an soc_reset to the device.
+		 */
+		u32 msg_count = le32_to_cpu(msg->hdr.count);
+		u32 msg_len = le32_to_cpu(msg->hdr.len);
+		u32 len = 0;
+		int j;
+
+		for (j = 0; j < msg_count && len < msg_len; ++j) {
+			struct wire_trans_hdr *trans_hdr;
+
+			trans_hdr = (struct wire_trans_hdr *)(msg->data + len);
+			if (le32_to_cpu(trans_hdr->type) == QAIC_TRANS_DEACTIVATE_FROM_DEV) {
+				if (decode_deactivate(qdev, trans_hdr, &len, NULL))
+					len += le32_to_cpu(trans_hdr->len);
+			} else {
+				len += le32_to_cpu(trans_hdr->len);
+			}
+		}
+		/* request must have timed out, drop packet */
+		kfree(msg);
+	}
+
+	kfree(resp);
+}
+
+static void free_wrapper_from_list(struct wrapper_list *wrappers, struct wrapper_msg *wrapper)
+{
+	bool all_done = false;
+
+	spin_lock(&wrappers->lock);
+	kref_put(&wrapper->ref_count, free_wrapper);
+	all_done = list_empty(&wrappers->list);
+	spin_unlock(&wrappers->lock);
+
+	if (all_done)
+		kfree(wrappers);
+}
+
+void qaic_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct wire_msg *msg = mhi_result->buf_addr;
+	struct wrapper_msg *wrapper = container_of(msg, struct wrapper_msg, msg);
+
+	free_wrapper_from_list(wrapper->head, wrapper);
+}
+
+void qaic_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct qaic_device *qdev = dev_get_drvdata(&mhi_dev->dev);
+	struct wire_msg *msg = mhi_result->buf_addr;
+	struct resp_work *resp;
+
+	if (mhi_result->transaction_status || msg->hdr.magic_number != MANAGE_MAGIC_NUMBER) {
+		kfree(msg);
+		return;
+	}
+
+	resp = kmalloc_obj(*resp, GFP_ATOMIC);
+	if (!resp) {
+		kfree(msg);
+		return;
+	}
+
+	INIT_WORK(&resp->work, resp_worker);
+	resp->qdev = qdev;
+	resp->buf = msg;
+	queue_work(qdev->cntl_wq, &resp->work);
+}
+
+int qaic_control_open(struct qaic_device *qdev)
+{
+	if (!qdev->cntl_ch)
+		return -ENODEV;
+
+	qdev->cntl_lost_buf = false;
+	/*
+	 * By default qaic should assume that device has CRC enabled.
+	 * Qaic comes to know if device has CRC enabled or disabled during the
+	 * device status transaction, which is the first transaction performed
+	 * on control channel.
+	 *
+	 * So CRC validation of first device status transaction response is
+	 * ignored (by calling valid_crc_stub) and is done later during decoding
+	 * if device has CRC enabled.
+	 * Now that qaic knows whether device has CRC enabled or not it acts
+	 * accordingly.
+	 */
+	qdev->gen_crc = gen_crc;
+	qdev->valid_crc = valid_crc_stub;
+
+	return mhi_prepare_for_transfer(qdev->cntl_ch);
+}
+
+void qaic_control_close(struct qaic_device *qdev)
+{
+	mhi_unprepare_from_transfer(qdev->cntl_ch);
+}
+
+void qaic_release_usr(struct qaic_device *qdev, struct qaic_user *usr)
+{
+	struct wire_trans_terminate_to_dev *trans;
+	struct wrapper_list *wrappers;
+	struct wrapper_msg *wrapper;
+	struct wire_msg *msg;
+	struct wire_msg *rsp;
+
+	wrappers = alloc_wrapper_list();
+	if (!wrappers)
+		return;
+
+	wrapper = add_wrapper(wrappers, sizeof(*wrapper) + sizeof(*msg) + sizeof(*trans));
+	if (!wrapper)
+		return;
+
+	msg = &wrapper->msg;
+
+	trans = (struct wire_trans_terminate_to_dev *)msg->data;
+
+	trans->hdr.type = cpu_to_le32(QAIC_TRANS_TERMINATE_TO_DEV);
+	trans->hdr.len = cpu_to_le32(sizeof(*trans));
+	trans->handle = cpu_to_le32(usr->handle);
+
+	mutex_lock(&qdev->cntl_mutex);
+	wrapper->len = sizeof(msg->hdr) + sizeof(*trans);
+	msg->hdr.magic_number = MANAGE_MAGIC_NUMBER;
+	msg->hdr.sequence_number = cpu_to_le32(qdev->next_seq_num++);
+	msg->hdr.len = cpu_to_le32(wrapper->len);
+	msg->hdr.count = cpu_to_le32(1);
+	msg->hdr.handle = cpu_to_le32(usr->handle);
+	msg->hdr.padding = cpu_to_le32(0);
+	msg->hdr.crc32 = cpu_to_le32(qdev->gen_crc(wrappers));
+
+	/*
+	 * msg_xfer releases the mutex
+	 * We don't care about the return of msg_xfer since we will not do
+	 * anything different based on what happens.
+	 * We ignore pending signals since one will be set if the user is
+	 * killed, and we need give the device a chance to cleanup, otherwise
+	 * DMA may still be in progress when we return.
+	 */
+	rsp = msg_xfer(qdev, wrappers, qdev->next_seq_num - 1, true);
+	if (!IS_ERR(rsp))
+		kfree(rsp);
+	free_wrapper_from_list(wrappers, wrapper);
+}
+
+void wake_all_cntl(struct qaic_device *qdev)
+{
+	struct xfer_queue_elem *elem;
+	struct xfer_queue_elem *i;
+
+	mutex_lock(&qdev->cntl_mutex);
+	list_for_each_entry_safe(elem, i, &qdev->cntl_xfer_list, list) {
+		list_del_init(&elem->list);
+		complete_all(&elem->xfer_done);
+	}
+	mutex_unlock(&qdev->cntl_mutex);
+}
diff --git a/drivers/accel/qaic/qaic_data.c b/drivers/accel/qaic/qaic_data.c
new file mode 100644
index 000000000..95300c2f7
--- /dev/null
+++ b/drivers/accel/qaic/qaic_data.c
@@ -0,0 +1,2072 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2019-2021, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-buf.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/math64.h>
+#include <linux/mm.h>
+#include <linux/moduleparam.h>
+#include <linux/scatterlist.h>
+#include <linux/spinlock.h>
+#include <linux/srcu.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+#include <drm/drm_file.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_prime.h>
+#include <drm/drm_print.h>
+#include <uapi/drm/qaic_accel.h>
+
+#include "qaic.h"
+
+#define SEM_VAL_MASK	GENMASK_ULL(11, 0)
+#define SEM_INDEX_MASK	GENMASK_ULL(4, 0)
+#define BULK_XFER	BIT(3)
+#define GEN_COMPLETION	BIT(4)
+#define INBOUND_XFER	1
+#define OUTBOUND_XFER	2
+#define REQHP_OFF	0x0 /* we read this */
+#define REQTP_OFF	0x4 /* we write this */
+#define RSPHP_OFF	0x8 /* we write this */
+#define RSPTP_OFF	0xc /* we read this */
+
+#define ENCODE_SEM(val, index, sync, cmd, flags)			\
+		({							\
+			FIELD_PREP(GENMASK(11, 0), (val)) |		\
+			FIELD_PREP(GENMASK(20, 16), (index)) |		\
+			FIELD_PREP(BIT(22), (sync)) |			\
+			FIELD_PREP(GENMASK(26, 24), (cmd)) |		\
+			FIELD_PREP(GENMASK(30, 29), (flags)) |		\
+			FIELD_PREP(BIT(31), (cmd) ? 1 : 0);		\
+		})
+#define NUM_EVENTS	128
+#define NUM_DELAYS	10
+#define fifo_at(base, offset) ((base) + (offset) * get_dbc_req_elem_size())
+
+static unsigned int wait_exec_default_timeout_ms = 5000; /* 5 sec default */
+module_param(wait_exec_default_timeout_ms, uint, 0600);
+MODULE_PARM_DESC(wait_exec_default_timeout_ms, "Default timeout for DRM_IOCTL_QAIC_WAIT_BO");
+
+static unsigned int datapath_poll_interval_us = 100; /* 100 usec default */
+module_param(datapath_poll_interval_us, uint, 0600);
+MODULE_PARM_DESC(datapath_poll_interval_us,
+		 "Amount of time to sleep between activity when datapath polling is enabled");
+
+struct dbc_req {
+	/*
+	 * A request ID is assigned to each memory handle going in DMA queue.
+	 * As a single memory handle can enqueue multiple elements in DMA queue
+	 * all of them will have the same request ID.
+	 */
+	__le16	req_id;
+	/* Future use */
+	__u8	seq_id;
+	/*
+	 * Special encoded variable
+	 * 7	0 - Do not force to generate MSI after DMA is completed
+	 *	1 - Force to generate MSI after DMA is completed
+	 * 6:5	Reserved
+	 * 4	1 - Generate completion element in the response queue
+	 *	0 - No Completion Code
+	 * 3	0 - DMA request is a Link list transfer
+	 *	1 - DMA request is a Bulk transfer
+	 * 2	Reserved
+	 * 1:0	00 - No DMA transfer involved
+	 *	01 - DMA transfer is part of inbound transfer
+	 *	10 - DMA transfer has outbound transfer
+	 *	11 - NA
+	 */
+	__u8	cmd;
+	__le32	resv;
+	/* Source address for the transfer */
+	__le64	src_addr;
+	/* Destination address for the transfer */
+	__le64	dest_addr;
+	/* Length of transfer request */
+	__le32	len;
+	__le32	resv2;
+	/* Doorbell address */
+	__le64	db_addr;
+	/*
+	 * Special encoded variable
+	 * 7	1 - Doorbell(db) write
+	 *	0 - No doorbell write
+	 * 6:2	Reserved
+	 * 1:0	00 - 32 bit access, db address must be aligned to 32bit-boundary
+	 *	01 - 16 bit access, db address must be aligned to 16bit-boundary
+	 *	10 - 8 bit access, db address must be aligned to 8bit-boundary
+	 *	11 - Reserved
+	 */
+	__u8	db_len;
+	__u8	resv3;
+	__le16	resv4;
+	/* 32 bit data written to doorbell address */
+	__le32	db_data;
+	/*
+	 * Special encoded variable
+	 * All the fields of sem_cmdX are passed from user and all are ORed
+	 * together to form sem_cmd.
+	 * 0:11		Semaphore value
+	 * 15:12	Reserved
+	 * 20:16	Semaphore index
+	 * 21		Reserved
+	 * 22		Semaphore Sync
+	 * 23		Reserved
+	 * 26:24	Semaphore command
+	 * 28:27	Reserved
+	 * 29		Semaphore DMA out bound sync fence
+	 * 30		Semaphore DMA in bound sync fence
+	 * 31		Enable semaphore command
+	 */
+	__le32	sem_cmd0;
+	__le32	sem_cmd1;
+	__le32	sem_cmd2;
+	__le32	sem_cmd3;
+} __packed;
+
+struct dbc_rsp {
+	/* Request ID of the memory handle whose DMA transaction is completed */
+	__le16	req_id;
+	/* Status of the DMA transaction. 0 : Success otherwise failure */
+	__le16	status;
+} __packed;
+
+static inline bool bo_queued(struct qaic_bo *bo)
+{
+	return !list_empty(&bo->xfer_list);
+}
+
+inline int get_dbc_req_elem_size(void)
+{
+	return sizeof(struct dbc_req);
+}
+
+inline int get_dbc_rsp_elem_size(void)
+{
+	return sizeof(struct dbc_rsp);
+}
+
+static void free_slice(struct kref *kref)
+{
+	struct bo_slice *slice = container_of(kref, struct bo_slice, ref_count);
+
+	slice->bo->total_slice_nents -= slice->nents;
+	list_del(&slice->slice);
+	drm_gem_object_put(&slice->bo->base);
+	sg_free_table(slice->sgt);
+	kfree(slice->sgt);
+	kvfree(slice->reqs);
+	kfree(slice);
+}
+
+static int clone_range_of_sgt_for_slice(struct qaic_device *qdev, struct sg_table **sgt_out,
+					struct sg_table *sgt_in, u64 size, u64 offset)
+{
+	struct scatterlist *sg, *sgn, *sgf, *sgl;
+	unsigned int len, nents, offf, offl;
+	struct sg_table *sgt;
+	size_t total_len;
+	int ret, j;
+
+	/* find out number of relevant nents needed for this mem */
+	total_len = 0;
+	sgf = NULL;
+	sgl = NULL;
+	nents = 0;
+	offf = 0;
+	offl = 0;
+
+	size = size ? size : PAGE_SIZE;
+	for_each_sgtable_dma_sg(sgt_in, sg, j) {
+		len = sg_dma_len(sg);
+
+		if (!len)
+			continue;
+		if (offset >= total_len && offset < total_len + len) {
+			sgf = sg;
+			offf = offset - total_len;
+		}
+		if (sgf)
+			nents++;
+		if (offset + size >= total_len &&
+		    offset + size <= total_len + len) {
+			sgl = sg;
+			offl = offset + size - total_len;
+			break;
+		}
+		total_len += len;
+	}
+
+	if (!sgf || !sgl) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	sgt = kzalloc_obj(*sgt);
+	if (!sgt) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = sg_alloc_table(sgt, nents, GFP_KERNEL);
+	if (ret)
+		goto free_sgt;
+
+	/* copy relevant sg node and fix page and length */
+	sgn = sgf;
+	for_each_sgtable_dma_sg(sgt, sg, j) {
+		memcpy(sg, sgn, sizeof(*sg));
+		if (sgn == sgf) {
+			sg_dma_address(sg) += offf;
+			sg_dma_len(sg) -= offf;
+			sg_set_page(sg, sg_page(sgn), sg_dma_len(sg), offf);
+		} else {
+			offf = 0;
+		}
+		if (sgn == sgl) {
+			sg_dma_len(sg) = offl - offf;
+			sg_set_page(sg, sg_page(sgn), offl - offf, offf);
+			sg_mark_end(sg);
+			break;
+		}
+		sgn = sg_next(sgn);
+	}
+
+	*sgt_out = sgt;
+	return ret;
+
+free_sgt:
+	kfree(sgt);
+out:
+	*sgt_out = NULL;
+	return ret;
+}
+
+static int encode_reqs(struct qaic_device *qdev, struct bo_slice *slice,
+		       struct qaic_attach_slice_entry *req)
+{
+	__le64 db_addr = cpu_to_le64(req->db_addr);
+	__le32 db_data = cpu_to_le32(req->db_data);
+	struct scatterlist *sg;
+	__u8 cmd = BULK_XFER;
+	int presync_sem;
+	u64 dev_addr;
+	__u8 db_len;
+	int i;
+
+	if (!slice->no_xfer)
+		cmd |= (slice->dir == DMA_TO_DEVICE ? INBOUND_XFER : OUTBOUND_XFER);
+
+	if (req->db_len && !IS_ALIGNED(req->db_addr, req->db_len / 8))
+		return -EINVAL;
+
+	presync_sem = req->sem0.presync + req->sem1.presync + req->sem2.presync + req->sem3.presync;
+	if (presync_sem > 1)
+		return -EINVAL;
+
+	presync_sem = req->sem0.presync << 0 | req->sem1.presync << 1 |
+		      req->sem2.presync << 2 | req->sem3.presync << 3;
+
+	switch (req->db_len) {
+	case 32:
+		db_len = BIT(7);
+		break;
+	case 16:
+		db_len = BIT(7) | 1;
+		break;
+	case 8:
+		db_len = BIT(7) | 2;
+		break;
+	case 0:
+		db_len = 0; /* doorbell is not active for this command */
+		break;
+	default:
+		return -EINVAL; /* should never hit this */
+	}
+
+	/*
+	 * When we end up splitting up a single request (ie a buf slice) into
+	 * multiple DMA requests, we have to manage the sync data carefully.
+	 * There can only be one presync sem. That needs to be on every xfer
+	 * so that the DMA engine doesn't transfer data before the receiver is
+	 * ready. We only do the doorbell and postsync sems after the xfer.
+	 * To guarantee previous xfers for the request are complete, we use a
+	 * fence.
+	 */
+	dev_addr = req->dev_addr;
+	for_each_sgtable_dma_sg(slice->sgt, sg, i) {
+		slice->reqs[i].cmd = cmd;
+		slice->reqs[i].src_addr = cpu_to_le64(slice->dir == DMA_TO_DEVICE ?
+						      sg_dma_address(sg) : dev_addr);
+		slice->reqs[i].dest_addr = cpu_to_le64(slice->dir == DMA_TO_DEVICE ?
+						       dev_addr : sg_dma_address(sg));
+		/*
+		 * sg_dma_len(sg) returns size of a DMA segment, maximum DMA
+		 * segment size is set to UINT_MAX by qaic and hence return
+		 * values of sg_dma_len(sg) can never exceed u32 range. So,
+		 * by down sizing we are not corrupting the value.
+		 */
+		slice->reqs[i].len = cpu_to_le32((u32)sg_dma_len(sg));
+		switch (presync_sem) {
+		case BIT(0):
+			slice->reqs[i].sem_cmd0 = cpu_to_le32(ENCODE_SEM(req->sem0.val,
+									 req->sem0.index,
+									 req->sem0.presync,
+									 req->sem0.cmd,
+									 req->sem0.flags));
+			break;
+		case BIT(1):
+			slice->reqs[i].sem_cmd1 = cpu_to_le32(ENCODE_SEM(req->sem1.val,
+									 req->sem1.index,
+									 req->sem1.presync,
+									 req->sem1.cmd,
+									 req->sem1.flags));
+			break;
+		case BIT(2):
+			slice->reqs[i].sem_cmd2 = cpu_to_le32(ENCODE_SEM(req->sem2.val,
+									 req->sem2.index,
+									 req->sem2.presync,
+									 req->sem2.cmd,
+									 req->sem2.flags));
+			break;
+		case BIT(3):
+			slice->reqs[i].sem_cmd3 = cpu_to_le32(ENCODE_SEM(req->sem3.val,
+									 req->sem3.index,
+									 req->sem3.presync,
+									 req->sem3.cmd,
+									 req->sem3.flags));
+			break;
+		}
+		dev_addr += sg_dma_len(sg);
+	}
+	/* add post transfer stuff to last segment */
+	i--;
+	slice->reqs[i].cmd |= GEN_COMPLETION;
+	slice->reqs[i].db_addr = db_addr;
+	slice->reqs[i].db_len = db_len;
+	slice->reqs[i].db_data = db_data;
+	/*
+	 * Add a fence if we have more than one request going to the hardware
+	 * representing the entirety of the user request, and the user request
+	 * has no presync condition.
+	 * Fences are expensive, so we try to avoid them. We rely on the
+	 * hardware behavior to avoid needing one when there is a presync
+	 * condition. When a presync exists, all requests for that same
+	 * presync will be queued into a fifo. Thus, since we queue the
+	 * post xfer activity only on the last request we queue, the hardware
+	 * will ensure that the last queued request is processed last, thus
+	 * making sure the post xfer activity happens at the right time without
+	 * a fence.
+	 */
+	if (i && !presync_sem)
+		req->sem0.flags |= (slice->dir == DMA_TO_DEVICE ?
+				    QAIC_SEM_INSYNCFENCE : QAIC_SEM_OUTSYNCFENCE);
+	slice->reqs[i].sem_cmd0 = cpu_to_le32(ENCODE_SEM(req->sem0.val, req->sem0.index,
+							 req->sem0.presync, req->sem0.cmd,
+							 req->sem0.flags));
+	slice->reqs[i].sem_cmd1 = cpu_to_le32(ENCODE_SEM(req->sem1.val, req->sem1.index,
+							 req->sem1.presync, req->sem1.cmd,
+							 req->sem1.flags));
+	slice->reqs[i].sem_cmd2 = cpu_to_le32(ENCODE_SEM(req->sem2.val, req->sem2.index,
+							 req->sem2.presync, req->sem2.cmd,
+							 req->sem2.flags));
+	slice->reqs[i].sem_cmd3 = cpu_to_le32(ENCODE_SEM(req->sem3.val, req->sem3.index,
+							 req->sem3.presync, req->sem3.cmd,
+							 req->sem3.flags));
+
+	return 0;
+}
+
+static int qaic_map_one_slice(struct qaic_device *qdev, struct qaic_bo *bo,
+			      struct qaic_attach_slice_entry *slice_ent)
+{
+	struct sg_table *sgt = NULL;
+	struct bo_slice *slice;
+	int ret;
+
+	ret = clone_range_of_sgt_for_slice(qdev, &sgt, bo->sgt, slice_ent->size, slice_ent->offset);
+	if (ret)
+		goto out;
+
+	slice = kmalloc_obj(*slice);
+	if (!slice) {
+		ret = -ENOMEM;
+		goto free_sgt;
+	}
+
+	slice->reqs = kvzalloc_objs(*slice->reqs, sgt->nents);
+	if (!slice->reqs) {
+		ret = -ENOMEM;
+		goto free_slice;
+	}
+
+	slice->no_xfer = !slice_ent->size;
+	slice->sgt = sgt;
+	slice->nents = sgt->nents;
+	slice->dir = bo->dir;
+	slice->bo = bo;
+	slice->size = slice_ent->size;
+	slice->offset = slice_ent->offset;
+
+	ret = encode_reqs(qdev, slice, slice_ent);
+	if (ret)
+		goto free_req;
+
+	bo->total_slice_nents += sgt->nents;
+	kref_init(&slice->ref_count);
+	drm_gem_object_get(&bo->base);
+	list_add_tail(&slice->slice, &bo->slices);
+
+	return 0;
+
+free_req:
+	kvfree(slice->reqs);
+free_slice:
+	kfree(slice);
+free_sgt:
+	sg_free_table(sgt);
+	kfree(sgt);
+out:
+	return ret;
+}
+
+static int create_sgt(struct qaic_device *qdev, struct sg_table **sgt_out, u64 size)
+{
+	struct scatterlist *sg;
+	struct sg_table *sgt;
+	struct page **pages;
+	int *pages_order;
+	int buf_extra;
+	int max_order;
+	int nr_pages;
+	int ret = 0;
+	int i, j, k;
+	int order;
+
+	if (size) {
+		nr_pages = DIV_ROUND_UP(size, PAGE_SIZE);
+		/*
+		 * calculate how much extra we are going to allocate, to remove
+		 * later
+		 */
+		buf_extra = (PAGE_SIZE - size % PAGE_SIZE) % PAGE_SIZE;
+		max_order = min(MAX_PAGE_ORDER, get_order(size));
+	} else {
+		/* allocate a single page for book keeping */
+		nr_pages = 1;
+		buf_extra = 0;
+		max_order = 0;
+	}
+
+	pages = kvmalloc_array(nr_pages, sizeof(*pages) + sizeof(*pages_order), GFP_KERNEL);
+	if (!pages) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	pages_order = (void *)pages + sizeof(*pages) * nr_pages;
+
+	/*
+	 * Allocate requested memory using alloc_pages. It is possible to allocate
+	 * the requested memory in multiple chunks by calling alloc_pages
+	 * multiple times. Use SG table to handle multiple allocated pages.
+	 */
+	i = 0;
+	while (nr_pages > 0) {
+		order = min(get_order(nr_pages * PAGE_SIZE), max_order);
+		while (1) {
+			pages[i] = alloc_pages(GFP_KERNEL | GFP_HIGHUSER |
+					       __GFP_NOWARN | __GFP_ZERO |
+					       (order ? __GFP_NORETRY : __GFP_RETRY_MAYFAIL),
+					       order);
+			if (pages[i])
+				break;
+			if (!order--) {
+				ret = -ENOMEM;
+				goto free_partial_alloc;
+			}
+		}
+
+		max_order = order;
+		pages_order[i] = order;
+
+		nr_pages -= 1 << order;
+		if (nr_pages <= 0)
+			/* account for over allocation */
+			buf_extra += abs(nr_pages) * PAGE_SIZE;
+		i++;
+	}
+
+	sgt = kmalloc_obj(*sgt);
+	if (!sgt) {
+		ret = -ENOMEM;
+		goto free_partial_alloc;
+	}
+
+	if (sg_alloc_table(sgt, i, GFP_KERNEL)) {
+		ret = -ENOMEM;
+		goto free_sgt;
+	}
+
+	/* Populate the SG table with the allocated memory pages */
+	sg = sgt->sgl;
+	for (k = 0; k < i; k++, sg = sg_next(sg)) {
+		/* Last entry requires special handling */
+		if (k < i - 1) {
+			sg_set_page(sg, pages[k], PAGE_SIZE << pages_order[k], 0);
+		} else {
+			sg_set_page(sg, pages[k], (PAGE_SIZE << pages_order[k]) - buf_extra, 0);
+			sg_mark_end(sg);
+		}
+	}
+
+	kvfree(pages);
+	*sgt_out = sgt;
+	return ret;
+
+free_sgt:
+	kfree(sgt);
+free_partial_alloc:
+	for (j = 0; j < i; j++)
+		__free_pages(pages[j], pages_order[j]);
+	kvfree(pages);
+out:
+	*sgt_out = NULL;
+	return ret;
+}
+
+static bool invalid_sem(struct qaic_sem *sem)
+{
+	if (sem->val & ~SEM_VAL_MASK || sem->index & ~SEM_INDEX_MASK ||
+	    !(sem->presync == 0 || sem->presync == 1) || sem->pad ||
+	    sem->flags & ~(QAIC_SEM_INSYNCFENCE | QAIC_SEM_OUTSYNCFENCE) ||
+	    sem->cmd > QAIC_SEM_WAIT_GT_0)
+		return true;
+	return false;
+}
+
+static int qaic_validate_req(struct qaic_device *qdev, struct qaic_attach_slice_entry *slice_ent,
+			     u32 count, u64 total_size)
+{
+	u64 total;
+	int i;
+
+	for (i = 0; i < count; i++) {
+		if (!(slice_ent[i].db_len == 32 || slice_ent[i].db_len == 16 ||
+		      slice_ent[i].db_len == 8 || slice_ent[i].db_len == 0) ||
+		      invalid_sem(&slice_ent[i].sem0) || invalid_sem(&slice_ent[i].sem1) ||
+		      invalid_sem(&slice_ent[i].sem2) || invalid_sem(&slice_ent[i].sem3))
+			return -EINVAL;
+
+		if (check_add_overflow(slice_ent[i].offset, slice_ent[i].size, &total) ||
+		    total > total_size)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void qaic_free_sgt(struct sg_table *sgt)
+{
+	struct scatterlist *sg;
+
+	if (!sgt)
+		return;
+
+	for (sg = sgt->sgl; sg; sg = sg_next(sg))
+		if (sg_page(sg))
+			__free_pages(sg_page(sg), get_order(sg->length));
+	sg_free_table(sgt);
+	kfree(sgt);
+}
+
+static void qaic_gem_print_info(struct drm_printer *p, unsigned int indent,
+				const struct drm_gem_object *obj)
+{
+	struct qaic_bo *bo = to_qaic_bo(obj);
+
+	drm_printf_indent(p, indent, "BO DMA direction %d\n", bo->dir);
+}
+
+static const struct vm_operations_struct drm_vm_ops = {
+	.open = drm_gem_vm_open,
+	.close = drm_gem_vm_close,
+};
+
+static int qaic_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+	struct qaic_bo *bo = to_qaic_bo(obj);
+	unsigned long offset = 0;
+	struct scatterlist *sg;
+	int ret = 0;
+
+	if (drm_gem_is_imported(obj))
+		return -EINVAL;
+
+	for (sg = bo->sgt->sgl; sg; sg = sg_next(sg)) {
+		if (sg_page(sg)) {
+			ret = remap_pfn_range(vma, vma->vm_start + offset, page_to_pfn(sg_page(sg)),
+					      sg->length, vma->vm_page_prot);
+			if (ret)
+				goto out;
+			offset += sg->length;
+		}
+	}
+
+out:
+	return ret;
+}
+
+static void qaic_free_object(struct drm_gem_object *obj)
+{
+	struct qaic_bo *bo = to_qaic_bo(obj);
+
+	if (drm_gem_is_imported(obj)) {
+		/* DMABUF/PRIME Path */
+		drm_prime_gem_destroy(obj, NULL);
+	} else {
+		/* Private buffer allocation path */
+		qaic_free_sgt(bo->sgt);
+	}
+
+	mutex_destroy(&bo->lock);
+	drm_gem_object_release(obj);
+	kfree(bo);
+}
+
+static struct sg_table *qaic_get_sg_table(struct drm_gem_object *obj)
+{
+	struct qaic_bo *bo = to_qaic_bo(obj);
+	struct scatterlist *sg, *sg_in;
+	struct sg_table *sgt, *sgt_in;
+	int i;
+
+	sgt_in = bo->sgt;
+
+	sgt = kmalloc_obj(*sgt);
+	if (!sgt)
+		return ERR_PTR(-ENOMEM);
+
+	if (sg_alloc_table(sgt, sgt_in->orig_nents, GFP_KERNEL)) {
+		kfree(sgt);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	sg = sgt->sgl;
+	for_each_sgtable_sg(sgt_in, sg_in, i) {
+		memcpy(sg, sg_in, sizeof(*sg));
+		sg = sg_next(sg);
+	}
+
+	return sgt;
+}
+
+static const struct drm_gem_object_funcs qaic_gem_funcs = {
+	.free = qaic_free_object,
+	.get_sg_table = qaic_get_sg_table,
+	.print_info = qaic_gem_print_info,
+	.mmap = qaic_gem_object_mmap,
+	.vm_ops = &drm_vm_ops,
+};
+
+static void qaic_init_bo(struct qaic_bo *bo, bool reinit)
+{
+	if (reinit) {
+		bo->sliced = false;
+		reinit_completion(&bo->xfer_done);
+	} else {
+		mutex_init(&bo->lock);
+		init_completion(&bo->xfer_done);
+	}
+	complete_all(&bo->xfer_done);
+	INIT_LIST_HEAD(&bo->slices);
+	INIT_LIST_HEAD(&bo->xfer_list);
+}
+
+static struct qaic_bo *qaic_alloc_init_bo(void)
+{
+	struct qaic_bo *bo;
+
+	bo = kzalloc_obj(*bo);
+	if (!bo)
+		return ERR_PTR(-ENOMEM);
+
+	qaic_init_bo(bo, false);
+
+	return bo;
+}
+
+int qaic_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct qaic_create_bo *args = data;
+	int usr_rcu_id, qdev_rcu_id;
+	struct drm_gem_object *obj;
+	struct qaic_device *qdev;
+	struct qaic_user *usr;
+	struct qaic_bo *bo;
+	size_t size;
+	int ret;
+
+	if (args->pad)
+		return -EINVAL;
+
+	size = PAGE_ALIGN(args->size);
+	if (size == 0)
+		return -EINVAL;
+
+	usr = file_priv->driver_priv;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		ret = -ENODEV;
+		goto unlock_usr_srcu;
+	}
+
+	qdev = usr->qddev->qdev;
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto unlock_dev_srcu;
+	}
+
+	bo = qaic_alloc_init_bo();
+	if (IS_ERR(bo)) {
+		ret = PTR_ERR(bo);
+		goto unlock_dev_srcu;
+	}
+	obj = &bo->base;
+
+	drm_gem_private_object_init(dev, obj, size);
+
+	obj->funcs = &qaic_gem_funcs;
+	ret = create_sgt(qdev, &bo->sgt, size);
+	if (ret)
+		goto free_bo;
+
+	ret = drm_gem_create_mmap_offset(obj);
+	if (ret)
+		goto free_bo;
+
+	ret = drm_gem_handle_create(file_priv, obj, &args->handle);
+	if (ret)
+		goto free_bo;
+
+	drm_gem_object_put(obj);
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+
+	return 0;
+
+free_bo:
+	drm_gem_object_put(obj);
+unlock_dev_srcu:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+unlock_usr_srcu:
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	return ret;
+}
+
+int qaic_mmap_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct qaic_mmap_bo *args = data;
+	int usr_rcu_id, qdev_rcu_id;
+	struct drm_gem_object *obj;
+	struct qaic_device *qdev;
+	struct qaic_user *usr;
+	int ret = 0;
+
+	usr = file_priv->driver_priv;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		ret = -ENODEV;
+		goto unlock_usr_srcu;
+	}
+
+	qdev = usr->qddev->qdev;
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto unlock_dev_srcu;
+	}
+
+	obj = drm_gem_object_lookup(file_priv, args->handle);
+	if (!obj) {
+		ret = -ENOENT;
+		goto unlock_dev_srcu;
+	}
+
+	args->offset = drm_vma_node_offset_addr(&obj->vma_node);
+
+	drm_gem_object_put(obj);
+
+unlock_dev_srcu:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+unlock_usr_srcu:
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	return ret;
+}
+
+struct drm_gem_object *qaic_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf)
+{
+	struct dma_buf_attachment *attach;
+	struct drm_gem_object *obj;
+	struct qaic_bo *bo;
+	int ret;
+
+	bo = qaic_alloc_init_bo();
+	if (IS_ERR(bo)) {
+		ret = PTR_ERR(bo);
+		goto out;
+	}
+
+	obj = &bo->base;
+	get_dma_buf(dma_buf);
+
+	attach = dma_buf_attach(dma_buf, dev->dev);
+	if (IS_ERR(attach)) {
+		ret = PTR_ERR(attach);
+		goto attach_fail;
+	}
+
+	if (!attach->dmabuf->size) {
+		ret = -EINVAL;
+		goto size_align_fail;
+	}
+
+	drm_gem_private_object_init(dev, obj, attach->dmabuf->size);
+	/*
+	 * skipping dma_buf_map_attachment() as we do not know the direction
+	 * just yet. Once the direction is known in the subsequent IOCTL to
+	 * attach slicing, we can do it then.
+	 */
+
+	obj->funcs = &qaic_gem_funcs;
+	obj->import_attach = attach;
+	obj->resv = dma_buf->resv;
+
+	return obj;
+
+size_align_fail:
+	dma_buf_detach(dma_buf, attach);
+attach_fail:
+	dma_buf_put(dma_buf);
+	kfree(bo);
+out:
+	return ERR_PTR(ret);
+}
+
+static int qaic_prepare_import_bo(struct qaic_bo *bo, struct qaic_attach_slice_hdr *hdr)
+{
+	struct drm_gem_object *obj = &bo->base;
+	struct sg_table *sgt;
+	int ret;
+
+	sgt = dma_buf_map_attachment(obj->import_attach, hdr->dir);
+	if (IS_ERR(sgt)) {
+		ret = PTR_ERR(sgt);
+		return ret;
+	}
+
+	bo->sgt = sgt;
+
+	return 0;
+}
+
+static int qaic_prepare_export_bo(struct qaic_device *qdev, struct qaic_bo *bo,
+				  struct qaic_attach_slice_hdr *hdr)
+{
+	int ret;
+
+	ret = dma_map_sgtable(&qdev->pdev->dev, bo->sgt, hdr->dir, 0);
+	if (ret)
+		return -EFAULT;
+
+	return 0;
+}
+
+static int qaic_prepare_bo(struct qaic_device *qdev, struct qaic_bo *bo,
+			   struct qaic_attach_slice_hdr *hdr)
+{
+	int ret;
+
+	if (drm_gem_is_imported(&bo->base))
+		ret = qaic_prepare_import_bo(bo, hdr);
+	else
+		ret = qaic_prepare_export_bo(qdev, bo, hdr);
+	bo->dir = hdr->dir;
+	bo->dbc = &qdev->dbc[hdr->dbc_id];
+	bo->nr_slice = hdr->count;
+
+	return ret;
+}
+
+static void qaic_unprepare_import_bo(struct qaic_bo *bo)
+{
+	dma_buf_unmap_attachment(bo->base.import_attach, bo->sgt, bo->dir);
+	bo->sgt = NULL;
+}
+
+static void qaic_unprepare_export_bo(struct qaic_device *qdev, struct qaic_bo *bo)
+{
+	dma_unmap_sgtable(&qdev->pdev->dev, bo->sgt, bo->dir, 0);
+}
+
+static void qaic_unprepare_bo(struct qaic_device *qdev, struct qaic_bo *bo)
+{
+	if (drm_gem_is_imported(&bo->base))
+		qaic_unprepare_import_bo(bo);
+	else
+		qaic_unprepare_export_bo(qdev, bo);
+
+	bo->dir = 0;
+	bo->dbc = NULL;
+	bo->nr_slice = 0;
+}
+
+static void qaic_free_slices_bo(struct qaic_bo *bo)
+{
+	struct bo_slice *slice, *temp;
+
+	list_for_each_entry_safe(slice, temp, &bo->slices, slice)
+		kref_put(&slice->ref_count, free_slice);
+	if (WARN_ON_ONCE(bo->total_slice_nents != 0))
+		bo->total_slice_nents = 0;
+	bo->nr_slice = 0;
+}
+
+static int qaic_attach_slicing_bo(struct qaic_device *qdev, struct qaic_bo *bo,
+				  struct qaic_attach_slice_hdr *hdr,
+				  struct qaic_attach_slice_entry *slice_ent)
+{
+	int ret, i;
+
+	for (i = 0; i < hdr->count; i++) {
+		ret = qaic_map_one_slice(qdev, bo, &slice_ent[i]);
+		if (ret) {
+			qaic_free_slices_bo(bo);
+			return ret;
+		}
+	}
+
+	if (bo->total_slice_nents > bo->dbc->nelem) {
+		qaic_free_slices_bo(bo);
+		return -ENOSPC;
+	}
+
+	return 0;
+}
+
+int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct qaic_attach_slice_entry *slice_ent;
+	struct qaic_attach_slice *args = data;
+	int rcu_id, usr_rcu_id, qdev_rcu_id;
+	struct dma_bridge_chan	*dbc;
+	struct drm_gem_object *obj;
+	struct qaic_device *qdev;
+	unsigned long arg_size;
+	struct qaic_user *usr;
+	u8 __user *user_data;
+	struct qaic_bo *bo;
+	int ret;
+
+	if (args->hdr.count == 0)
+		return -EINVAL;
+
+	if (check_mul_overflow((unsigned long)args->hdr.count,
+			       (unsigned long)sizeof(*slice_ent),
+			       &arg_size))
+		return -EINVAL;
+
+	if (!(args->hdr.dir == DMA_TO_DEVICE || args->hdr.dir == DMA_FROM_DEVICE))
+		return -EINVAL;
+
+	if (args->data == 0)
+		return -EINVAL;
+
+	usr = file_priv->driver_priv;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		ret = -ENODEV;
+		goto unlock_usr_srcu;
+	}
+
+	qdev = usr->qddev->qdev;
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto unlock_dev_srcu;
+	}
+
+	if (args->hdr.dbc_id >= qdev->num_dbc) {
+		ret = -EINVAL;
+		goto unlock_dev_srcu;
+	}
+
+	user_data = u64_to_user_ptr(args->data);
+
+	slice_ent = memdup_user(user_data, arg_size);
+	if (IS_ERR(slice_ent)) {
+		ret = PTR_ERR(slice_ent);
+		goto unlock_dev_srcu;
+	}
+
+	obj = drm_gem_object_lookup(file_priv, args->hdr.handle);
+	if (!obj) {
+		ret = -ENOENT;
+		goto free_slice_ent;
+	}
+
+	ret = qaic_validate_req(qdev, slice_ent, args->hdr.count, obj->size);
+	if (ret)
+		goto put_bo;
+
+	bo = to_qaic_bo(obj);
+	ret = mutex_lock_interruptible(&bo->lock);
+	if (ret)
+		goto put_bo;
+
+	if (bo->sliced) {
+		ret = -EINVAL;
+		goto unlock_bo;
+	}
+
+	dbc = &qdev->dbc[args->hdr.dbc_id];
+	rcu_id = srcu_read_lock(&dbc->ch_lock);
+	if (dbc->usr != usr) {
+		ret = -EINVAL;
+		goto unlock_ch_srcu;
+	}
+
+	if (dbc->id == qdev->ssr_dbc) {
+		ret = -EPIPE;
+		goto unlock_ch_srcu;
+	}
+
+	ret = qaic_prepare_bo(qdev, bo, &args->hdr);
+	if (ret)
+		goto unlock_ch_srcu;
+
+	ret = qaic_attach_slicing_bo(qdev, bo, &args->hdr, slice_ent);
+	if (ret)
+		goto unprepare_bo;
+
+	if (args->hdr.dir == DMA_TO_DEVICE)
+		dma_sync_sgtable_for_cpu(&qdev->pdev->dev, bo->sgt, args->hdr.dir);
+
+	bo->sliced = true;
+	list_add_tail(&bo->bo_list, &bo->dbc->bo_lists);
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+	mutex_unlock(&bo->lock);
+	kfree(slice_ent);
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+
+	return 0;
+
+unprepare_bo:
+	qaic_unprepare_bo(qdev, bo);
+unlock_ch_srcu:
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+unlock_bo:
+	mutex_unlock(&bo->lock);
+put_bo:
+	drm_gem_object_put(obj);
+free_slice_ent:
+	kfree(slice_ent);
+unlock_dev_srcu:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+unlock_usr_srcu:
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	return ret;
+}
+
+static inline u32 fifo_space_avail(u32 head, u32 tail, u32 q_size)
+{
+	u32 avail = head - tail - 1;
+
+	if (head <= tail)
+		avail += q_size;
+
+	return avail;
+}
+
+static inline int copy_exec_reqs(struct qaic_device *qdev, struct bo_slice *slice, u32 dbc_id,
+				 u32 head, u32 *ptail)
+{
+	struct dma_bridge_chan *dbc = &qdev->dbc[dbc_id];
+	struct dbc_req *reqs = slice->reqs;
+	u32 tail = *ptail;
+	u32 avail;
+
+	avail = fifo_space_avail(head, tail, dbc->nelem);
+	if (avail < slice->nents)
+		return -EAGAIN;
+
+	if (tail + slice->nents > dbc->nelem) {
+		avail = dbc->nelem - tail;
+		avail = min_t(u32, avail, slice->nents);
+		memcpy(fifo_at(dbc->req_q_base, tail), reqs, sizeof(*reqs) * avail);
+		reqs += avail;
+		avail = slice->nents - avail;
+		if (avail)
+			memcpy(dbc->req_q_base, reqs, sizeof(*reqs) * avail);
+	} else {
+		memcpy(fifo_at(dbc->req_q_base, tail), reqs, sizeof(*reqs) * slice->nents);
+	}
+
+	*ptail = (tail + slice->nents) % dbc->nelem;
+
+	return 0;
+}
+
+static inline int copy_partial_exec_reqs(struct qaic_device *qdev, struct bo_slice *slice,
+					 u64 resize, struct dma_bridge_chan *dbc, u32 head,
+					 u32 *ptail)
+{
+	struct dbc_req *reqs = slice->reqs;
+	struct dbc_req *last_req;
+	u32 tail = *ptail;
+	u64 last_bytes;
+	u32 first_n;
+	u32 avail;
+
+	avail = fifo_space_avail(head, tail, dbc->nelem);
+
+	/*
+	 * After this for loop is complete, first_n represents the index
+	 * of the last DMA request of this slice that needs to be
+	 * transferred after resizing and last_bytes represents DMA size
+	 * of that request.
+	 */
+	last_bytes = resize;
+	for (first_n = 0; first_n < slice->nents; first_n++)
+		if (last_bytes > le32_to_cpu(reqs[first_n].len))
+			last_bytes -= le32_to_cpu(reqs[first_n].len);
+		else
+			break;
+
+	if (avail < (first_n + 1))
+		return -EAGAIN;
+
+	if (first_n) {
+		if (tail + first_n > dbc->nelem) {
+			avail = dbc->nelem - tail;
+			avail = min_t(u32, avail, first_n);
+			memcpy(fifo_at(dbc->req_q_base, tail), reqs, sizeof(*reqs) * avail);
+			last_req = reqs + avail;
+			avail = first_n - avail;
+			if (avail)
+				memcpy(dbc->req_q_base, last_req, sizeof(*reqs) * avail);
+		} else {
+			memcpy(fifo_at(dbc->req_q_base, tail), reqs, sizeof(*reqs) * first_n);
+		}
+	}
+
+	/*
+	 * Copy over the last entry. Here we need to adjust len to the left over
+	 * size, and set src and dst to the entry it is copied to.
+	 */
+	last_req = fifo_at(dbc->req_q_base, (tail + first_n) % dbc->nelem);
+	memcpy(last_req, reqs + slice->nents - 1, sizeof(*reqs));
+
+	/*
+	 * last_bytes holds size of a DMA segment, maximum DMA segment size is
+	 * set to UINT_MAX by qaic and hence last_bytes can never exceed u32
+	 * range. So, by down sizing we are not corrupting the value.
+	 */
+	last_req->len = cpu_to_le32((u32)last_bytes);
+	last_req->src_addr = reqs[first_n].src_addr;
+	last_req->dest_addr = reqs[first_n].dest_addr;
+	if (!last_bytes)
+		/* Disable DMA transfer */
+		last_req->cmd = GENMASK(7, 2) & reqs[first_n].cmd;
+
+	*ptail = (tail + first_n + 1) % dbc->nelem;
+
+	return 0;
+}
+
+static int send_bo_list_to_device(struct qaic_device *qdev, struct drm_file *file_priv,
+				  struct qaic_execute_entry *exec, unsigned int count,
+				  bool is_partial, struct dma_bridge_chan *dbc, u32 head,
+				  u32 *tail)
+{
+	struct qaic_partial_execute_entry *pexec = (struct qaic_partial_execute_entry *)exec;
+	struct drm_gem_object *obj;
+	struct bo_slice *slice;
+	unsigned long flags;
+	struct qaic_bo *bo;
+	int i, j;
+	int ret;
+
+	for (i = 0; i < count; i++) {
+		/*
+		 * ref count will be decremented when the transfer of this
+		 * buffer is complete. It is inside dbc_irq_threaded_fn().
+		 */
+		obj = drm_gem_object_lookup(file_priv,
+					    is_partial ? pexec[i].handle : exec[i].handle);
+		if (!obj) {
+			ret = -ENOENT;
+			goto failed_to_send_bo;
+		}
+
+		bo = to_qaic_bo(obj);
+		ret = mutex_lock_interruptible(&bo->lock);
+		if (ret)
+			goto failed_to_send_bo;
+
+		if (!bo->sliced) {
+			ret = -EINVAL;
+			goto unlock_bo;
+		}
+
+		if (is_partial && pexec[i].resize > bo->base.size) {
+			ret = -EINVAL;
+			goto unlock_bo;
+		}
+
+		spin_lock_irqsave(&dbc->xfer_lock, flags);
+		if (bo_queued(bo)) {
+			spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+			ret = -EINVAL;
+			goto unlock_bo;
+		}
+
+		bo->req_id = dbc->next_req_id++;
+
+		list_for_each_entry(slice, &bo->slices, slice) {
+			for (j = 0; j < slice->nents; j++)
+				slice->reqs[j].req_id = cpu_to_le16(bo->req_id);
+
+			if (is_partial && (!pexec[i].resize || pexec[i].resize <= slice->offset))
+				/* Configure the slice for no DMA transfer */
+				ret = copy_partial_exec_reqs(qdev, slice, 0, dbc, head, tail);
+			else if (is_partial && pexec[i].resize < slice->offset + slice->size)
+				/* Configure the slice to be partially DMA transferred */
+				ret = copy_partial_exec_reqs(qdev, slice,
+							     pexec[i].resize - slice->offset, dbc,
+							     head, tail);
+			else
+				ret = copy_exec_reqs(qdev, slice, dbc->id, head, tail);
+			if (ret) {
+				spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+				goto unlock_bo;
+			}
+		}
+		reinit_completion(&bo->xfer_done);
+		list_add_tail(&bo->xfer_list, &dbc->xfer_list);
+		spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+		dma_sync_sgtable_for_device(&qdev->pdev->dev, bo->sgt, bo->dir);
+		mutex_unlock(&bo->lock);
+	}
+
+	return 0;
+
+unlock_bo:
+	mutex_unlock(&bo->lock);
+failed_to_send_bo:
+	if (likely(obj))
+		drm_gem_object_put(obj);
+	for (j = 0; j < i; j++) {
+		spin_lock_irqsave(&dbc->xfer_lock, flags);
+		bo = list_last_entry(&dbc->xfer_list, struct qaic_bo, xfer_list);
+		obj = &bo->base;
+		list_del_init(&bo->xfer_list);
+		spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+		dma_sync_sgtable_for_cpu(&qdev->pdev->dev, bo->sgt, bo->dir);
+		drm_gem_object_put(obj);
+	}
+	return ret;
+}
+
+static void update_profiling_data(struct drm_file *file_priv,
+				  struct qaic_execute_entry *exec, unsigned int count,
+				  bool is_partial, u64 received_ts, u64 submit_ts, u32 queue_level)
+{
+	struct qaic_partial_execute_entry *pexec = (struct qaic_partial_execute_entry *)exec;
+	struct drm_gem_object *obj;
+	struct qaic_bo *bo;
+	int i;
+
+	for (i = 0; i < count; i++) {
+		/*
+		 * Since we already committed the BO to hardware, the only way
+		 * this should fail is a pending signal. We can't cancel the
+		 * submit to hardware, so we have to just skip the profiling
+		 * data. In case the signal is not fatal to the process, we
+		 * return success so that the user doesn't try to resubmit.
+		 */
+		obj = drm_gem_object_lookup(file_priv,
+					    is_partial ? pexec[i].handle : exec[i].handle);
+		if (!obj)
+			break;
+		bo = to_qaic_bo(obj);
+		bo->perf_stats.req_received_ts = received_ts;
+		bo->perf_stats.req_submit_ts = submit_ts;
+		bo->perf_stats.queue_level_before = queue_level;
+		queue_level += bo->total_slice_nents;
+		drm_gem_object_put(obj);
+	}
+}
+
+static int __qaic_execute_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv,
+				   bool is_partial)
+{
+	struct qaic_execute *args = data;
+	struct qaic_execute_entry *exec;
+	struct dma_bridge_chan *dbc;
+	int usr_rcu_id, qdev_rcu_id;
+	struct qaic_device *qdev;
+	struct qaic_user *usr;
+	u64 received_ts;
+	u32 queue_level;
+	u64 submit_ts;
+	int rcu_id;
+	u32 head;
+	u32 tail;
+	u64 size;
+	int ret;
+
+	received_ts = ktime_get_ns();
+
+	size = is_partial ? sizeof(struct qaic_partial_execute_entry) : sizeof(*exec);
+	if (args->hdr.count == 0)
+		return -EINVAL;
+
+	exec = memdup_array_user(u64_to_user_ptr(args->data), args->hdr.count, size);
+	if (IS_ERR(exec))
+		return PTR_ERR(exec);
+
+	usr = file_priv->driver_priv;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		ret = -ENODEV;
+		goto unlock_usr_srcu;
+	}
+
+	qdev = usr->qddev->qdev;
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto unlock_dev_srcu;
+	}
+
+	if (args->hdr.dbc_id >= qdev->num_dbc) {
+		ret = -EINVAL;
+		goto unlock_dev_srcu;
+	}
+
+	dbc = &qdev->dbc[args->hdr.dbc_id];
+
+	rcu_id = srcu_read_lock(&dbc->ch_lock);
+	if (!dbc->usr || dbc->usr->handle != usr->handle) {
+		ret = -EPERM;
+		goto release_ch_rcu;
+	}
+
+	if (dbc->id == qdev->ssr_dbc) {
+		ret = -EPIPE;
+		goto release_ch_rcu;
+	}
+
+	ret = mutex_lock_interruptible(&dbc->req_lock);
+	if (ret)
+		goto release_ch_rcu;
+
+	head = readl(dbc->dbc_base + REQHP_OFF);
+	tail = readl(dbc->dbc_base + REQTP_OFF);
+
+	if (head == U32_MAX || tail == U32_MAX) {
+		/* PCI link error */
+		ret = -ENODEV;
+		goto unlock_req_lock;
+	}
+
+	queue_level = head <= tail ? tail - head : dbc->nelem - (head - tail);
+
+	ret = send_bo_list_to_device(qdev, file_priv, exec, args->hdr.count, is_partial, dbc,
+				     head, &tail);
+	if (ret)
+		goto unlock_req_lock;
+
+	/* Finalize commit to hardware */
+	submit_ts = ktime_get_ns();
+	writel(tail, dbc->dbc_base + REQTP_OFF);
+	mutex_unlock(&dbc->req_lock);
+
+	update_profiling_data(file_priv, exec, args->hdr.count, is_partial, received_ts,
+			      submit_ts, queue_level);
+
+	if (datapath_polling)
+		schedule_work(&dbc->poll_work);
+
+unlock_req_lock:
+	if (ret)
+		mutex_unlock(&dbc->req_lock);
+release_ch_rcu:
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+unlock_dev_srcu:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+unlock_usr_srcu:
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	kfree(exec);
+	return ret;
+}
+
+int qaic_execute_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	return __qaic_execute_bo_ioctl(dev, data, file_priv, false);
+}
+
+int qaic_partial_execute_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	return __qaic_execute_bo_ioctl(dev, data, file_priv, true);
+}
+
+/*
+ * Our interrupt handling is a bit more complicated than a simple ideal, but
+ * sadly necessary.
+ *
+ * Each dbc has a completion queue. Entries in the queue correspond to DMA
+ * requests which the device has processed. The hardware already has a built
+ * in irq mitigation. When the device puts an entry into the queue, it will
+ * only trigger an interrupt if the queue was empty. Therefore, when adding
+ * the Nth event to a non-empty queue, the hardware doesn't trigger an
+ * interrupt. This means the host doesn't get additional interrupts signaling
+ * the same thing - the queue has something to process.
+ * This behavior can be overridden in the DMA request.
+ * This means that when the host receives an interrupt, it is required to
+ * drain the queue.
+ *
+ * This behavior is what NAPI attempts to accomplish, although we can't use
+ * NAPI as we don't have a netdev. We use threaded irqs instead.
+ *
+ * However, there is a situation where the host drains the queue fast enough
+ * that every event causes an interrupt. Typically this is not a problem as
+ * the rate of events would be low. However, that is not the case with
+ * lprnet for example. On an Intel Xeon D-2191 where we run 8 instances of
+ * lprnet, the host receives roughly 80k interrupts per second from the device
+ * (per /proc/interrupts). While NAPI documentation indicates the host should
+ * just chug along, sadly that behavior causes instability in some hosts.
+ *
+ * Therefore, we implement an interrupt disable scheme similar to NAPI. The
+ * key difference is that we will delay after draining the queue for a small
+ * time to allow additional events to come in via polling. Using the above
+ * lprnet workload, this reduces the number of interrupts processed from
+ * ~80k/sec to about 64 in 5 minutes and appears to solve the system
+ * instability.
+ */
+irqreturn_t dbc_irq_handler(int irq, void *data)
+{
+	struct dma_bridge_chan *dbc = data;
+	int rcu_id;
+	u32 head;
+	u32 tail;
+
+	rcu_id = srcu_read_lock(&dbc->ch_lock);
+
+	if (datapath_polling) {
+		srcu_read_unlock(&dbc->ch_lock, rcu_id);
+		/*
+		 * Normally datapath_polling will not have irqs enabled, but
+		 * when running with only one MSI the interrupt is shared with
+		 * MHI so it cannot be disabled. Return ASAP instead.
+		 */
+		return IRQ_HANDLED;
+	}
+
+	if (!dbc->usr) {
+		srcu_read_unlock(&dbc->ch_lock, rcu_id);
+		return IRQ_HANDLED;
+	}
+
+	head = readl(dbc->dbc_base + RSPHP_OFF);
+	if (head == U32_MAX) { /* PCI link error */
+		srcu_read_unlock(&dbc->ch_lock, rcu_id);
+		return IRQ_NONE;
+	}
+
+	tail = readl(dbc->dbc_base + RSPTP_OFF);
+	if (tail == U32_MAX) { /* PCI link error */
+		srcu_read_unlock(&dbc->ch_lock, rcu_id);
+		return IRQ_NONE;
+	}
+
+	if (head == tail) { /* queue empty */
+		srcu_read_unlock(&dbc->ch_lock, rcu_id);
+		return IRQ_NONE;
+	}
+
+	if (!dbc->qdev->single_msi)
+		disable_irq_nosync(irq);
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+	return IRQ_WAKE_THREAD;
+}
+
+void qaic_irq_polling_work(struct work_struct *work)
+{
+	struct dma_bridge_chan *dbc = container_of(work, struct dma_bridge_chan,  poll_work);
+	unsigned long flags;
+	int rcu_id;
+	u32 head;
+	u32 tail;
+
+	rcu_id = srcu_read_lock(&dbc->ch_lock);
+
+	while (1) {
+		if (dbc->qdev->dev_state != QAIC_ONLINE) {
+			srcu_read_unlock(&dbc->ch_lock, rcu_id);
+			return;
+		}
+		if (!dbc->usr) {
+			srcu_read_unlock(&dbc->ch_lock, rcu_id);
+			return;
+		}
+		spin_lock_irqsave(&dbc->xfer_lock, flags);
+		if (list_empty(&dbc->xfer_list)) {
+			spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+			srcu_read_unlock(&dbc->ch_lock, rcu_id);
+			return;
+		}
+		spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+
+		head = readl(dbc->dbc_base + RSPHP_OFF);
+		if (head == U32_MAX) { /* PCI link error */
+			srcu_read_unlock(&dbc->ch_lock, rcu_id);
+			return;
+		}
+
+		tail = readl(dbc->dbc_base + RSPTP_OFF);
+		if (tail == U32_MAX) { /* PCI link error */
+			srcu_read_unlock(&dbc->ch_lock, rcu_id);
+			return;
+		}
+
+		if (head != tail) {
+			irq_wake_thread(dbc->irq, dbc);
+			srcu_read_unlock(&dbc->ch_lock, rcu_id);
+			return;
+		}
+
+		cond_resched();
+		usleep_range(datapath_poll_interval_us, 2 * datapath_poll_interval_us);
+	}
+}
+
+irqreturn_t dbc_irq_threaded_fn(int irq, void *data)
+{
+	struct dma_bridge_chan *dbc = data;
+	int event_count = NUM_EVENTS;
+	int delay_count = NUM_DELAYS;
+	struct qaic_device *qdev;
+	struct qaic_bo *bo, *i;
+	struct dbc_rsp *rsp;
+	unsigned long flags;
+	int rcu_id;
+	u16 status;
+	u16 req_id;
+	u32 head;
+	u32 tail;
+
+	rcu_id = srcu_read_lock(&dbc->ch_lock);
+	qdev = dbc->qdev;
+
+	head = readl(dbc->dbc_base + RSPHP_OFF);
+	if (head == U32_MAX) /* PCI link error */
+		goto error_out;
+
+read_fifo:
+
+	if (!event_count) {
+		event_count = NUM_EVENTS;
+		cond_resched();
+	}
+
+	/*
+	 * if this channel isn't assigned or gets unassigned during processing
+	 * we have nothing further to do
+	 */
+	if (!dbc->usr)
+		goto error_out;
+
+	tail = readl(dbc->dbc_base + RSPTP_OFF);
+	if (tail == U32_MAX) /* PCI link error */
+		goto error_out;
+
+	if (head == tail) { /* queue empty */
+		if (delay_count) {
+			--delay_count;
+			usleep_range(100, 200);
+			goto read_fifo; /* check for a new event */
+		}
+		goto normal_out;
+	}
+
+	delay_count = NUM_DELAYS;
+	while (head != tail) {
+		if (!event_count)
+			break;
+		--event_count;
+		rsp = dbc->rsp_q_base + head * sizeof(*rsp);
+		req_id = le16_to_cpu(rsp->req_id);
+		status = le16_to_cpu(rsp->status);
+		if (status)
+			pci_dbg(qdev->pdev, "req_id %d failed with status %d\n", req_id, status);
+		spin_lock_irqsave(&dbc->xfer_lock, flags);
+		/*
+		 * A BO can receive multiple interrupts, since a BO can be
+		 * divided into multiple slices and a buffer receives as many
+		 * interrupts as slices. So until it receives interrupts for
+		 * all the slices we cannot mark that buffer complete.
+		 */
+		list_for_each_entry_safe(bo, i, &dbc->xfer_list, xfer_list) {
+			if (bo->req_id == req_id)
+				bo->nr_slice_xfer_done++;
+			else
+				continue;
+
+			if (bo->nr_slice_xfer_done < bo->nr_slice)
+				break;
+
+			/*
+			 * At this point we have received all the interrupts for
+			 * BO, which means BO execution is complete.
+			 */
+			dma_sync_sgtable_for_cpu(&qdev->pdev->dev, bo->sgt, bo->dir);
+			bo->nr_slice_xfer_done = 0;
+			list_del_init(&bo->xfer_list);
+			bo->perf_stats.req_processed_ts = ktime_get_ns();
+			complete_all(&bo->xfer_done);
+			drm_gem_object_put(&bo->base);
+			break;
+		}
+		spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+		head = (head + 1) % dbc->nelem;
+	}
+
+	/*
+	 * Update the head pointer of response queue and let the device know
+	 * that we have consumed elements from the queue.
+	 */
+	writel(head, dbc->dbc_base + RSPHP_OFF);
+
+	/* elements might have been put in the queue while we were processing */
+	goto read_fifo;
+
+normal_out:
+	if (!qdev->single_msi && likely(!datapath_polling))
+		enable_irq(irq);
+	else if (unlikely(datapath_polling))
+		schedule_work(&dbc->poll_work);
+	/* checking the fifo and enabling irqs is a race, missed event check */
+	tail = readl(dbc->dbc_base + RSPTP_OFF);
+	if (tail != U32_MAX && head != tail) {
+		if (!qdev->single_msi && likely(!datapath_polling))
+			disable_irq_nosync(irq);
+		goto read_fifo;
+	}
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+	return IRQ_HANDLED;
+
+error_out:
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+	if (!qdev->single_msi && likely(!datapath_polling))
+		enable_irq(irq);
+	else if (unlikely(datapath_polling))
+		schedule_work(&dbc->poll_work);
+
+	return IRQ_HANDLED;
+}
+
+int qaic_wait_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct qaic_wait *args = data;
+	int usr_rcu_id, qdev_rcu_id;
+	struct dma_bridge_chan *dbc;
+	struct drm_gem_object *obj;
+	struct qaic_device *qdev;
+	unsigned long timeout;
+	struct qaic_user *usr;
+	struct qaic_bo *bo;
+	int rcu_id;
+	int ret;
+
+	if (args->pad != 0)
+		return -EINVAL;
+
+	usr = file_priv->driver_priv;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		ret = -ENODEV;
+		goto unlock_usr_srcu;
+	}
+
+	qdev = usr->qddev->qdev;
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto unlock_dev_srcu;
+	}
+
+	if (args->dbc_id >= qdev->num_dbc) {
+		ret = -EINVAL;
+		goto unlock_dev_srcu;
+	}
+
+	dbc = &qdev->dbc[args->dbc_id];
+
+	rcu_id = srcu_read_lock(&dbc->ch_lock);
+	if (dbc->usr != usr) {
+		ret = -EPERM;
+		goto unlock_ch_srcu;
+	}
+
+	if (dbc->id == qdev->ssr_dbc) {
+		ret = -EPIPE;
+		goto unlock_ch_srcu;
+	}
+
+	obj = drm_gem_object_lookup(file_priv, args->handle);
+	if (!obj) {
+		ret = -ENOENT;
+		goto unlock_ch_srcu;
+	}
+
+	bo = to_qaic_bo(obj);
+	timeout = args->timeout ? args->timeout : wait_exec_default_timeout_ms;
+	timeout = msecs_to_jiffies(timeout);
+	ret = wait_for_completion_interruptible_timeout(&bo->xfer_done, timeout);
+	if (!ret) {
+		ret = -ETIMEDOUT;
+		goto put_obj;
+	}
+	if (ret > 0)
+		ret = 0;
+
+	if (!dbc->usr)
+		ret = -EPERM;
+
+	if (dbc->id == qdev->ssr_dbc)
+		ret = -EPIPE;
+
+put_obj:
+	drm_gem_object_put(obj);
+unlock_ch_srcu:
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+unlock_dev_srcu:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+unlock_usr_srcu:
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	return ret;
+}
+
+int qaic_perf_stats_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct qaic_perf_stats_entry *ent = NULL;
+	struct qaic_perf_stats *args = data;
+	int usr_rcu_id, qdev_rcu_id;
+	struct drm_gem_object *obj;
+	struct qaic_device *qdev;
+	struct qaic_user *usr;
+	struct qaic_bo *bo;
+	int ret = 0;
+	int i;
+
+	usr = file_priv->driver_priv;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		ret = -ENODEV;
+		goto unlock_usr_srcu;
+	}
+
+	qdev = usr->qddev->qdev;
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto unlock_dev_srcu;
+	}
+
+	if (args->hdr.dbc_id >= qdev->num_dbc) {
+		ret = -EINVAL;
+		goto unlock_dev_srcu;
+	}
+
+	ent = memdup_array_user(u64_to_user_ptr(args->data), args->hdr.count, sizeof(*ent));
+	if (IS_ERR(ent)) {
+		ret = PTR_ERR(ent);
+		goto unlock_dev_srcu;
+	}
+
+	for (i = 0; i < args->hdr.count; i++) {
+		obj = drm_gem_object_lookup(file_priv, ent[i].handle);
+		if (!obj) {
+			ret = -ENOENT;
+			goto free_ent;
+		}
+		bo = to_qaic_bo(obj);
+		if (!bo->sliced) {
+			drm_gem_object_put(obj);
+			ret = -EINVAL;
+			goto free_ent;
+		}
+		if (bo->dbc->id != args->hdr.dbc_id) {
+			drm_gem_object_put(obj);
+			ret = -EINVAL;
+			goto free_ent;
+		}
+		/*
+		 * perf stats ioctl is called before wait ioctl is complete then
+		 * the latency information is invalid.
+		 */
+		if (bo->perf_stats.req_processed_ts < bo->perf_stats.req_submit_ts) {
+			ent[i].device_latency_us = 0;
+		} else {
+			ent[i].device_latency_us = div_u64((bo->perf_stats.req_processed_ts -
+							    bo->perf_stats.req_submit_ts), 1000);
+		}
+		ent[i].submit_latency_us = div_u64((bo->perf_stats.req_submit_ts -
+						    bo->perf_stats.req_received_ts), 1000);
+		ent[i].queue_level_before = bo->perf_stats.queue_level_before;
+		ent[i].num_queue_element = bo->total_slice_nents;
+		drm_gem_object_put(obj);
+	}
+
+	if (copy_to_user(u64_to_user_ptr(args->data), ent, args->hdr.count * sizeof(*ent)))
+		ret = -EFAULT;
+
+free_ent:
+	kfree(ent);
+unlock_dev_srcu:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+unlock_usr_srcu:
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	return ret;
+}
+
+static void detach_slice_bo(struct qaic_device *qdev, struct qaic_bo *bo)
+{
+	qaic_free_slices_bo(bo);
+	qaic_unprepare_bo(qdev, bo);
+	qaic_init_bo(bo, true);
+	list_del(&bo->bo_list);
+	drm_gem_object_put(&bo->base);
+}
+
+int qaic_detach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct qaic_detach_slice *args = data;
+	int rcu_id, usr_rcu_id, qdev_rcu_id;
+	struct dma_bridge_chan *dbc;
+	struct drm_gem_object *obj;
+	struct qaic_device *qdev;
+	struct qaic_user *usr;
+	unsigned long flags;
+	struct qaic_bo *bo;
+	int ret;
+
+	if (args->pad != 0)
+		return -EINVAL;
+
+	usr = file_priv->driver_priv;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (!usr->qddev) {
+		ret = -ENODEV;
+		goto unlock_usr_srcu;
+	}
+
+	qdev = usr->qddev->qdev;
+	qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto unlock_dev_srcu;
+	}
+
+	obj = drm_gem_object_lookup(file_priv, args->handle);
+	if (!obj) {
+		ret = -ENOENT;
+		goto unlock_dev_srcu;
+	}
+
+	bo = to_qaic_bo(obj);
+	ret = mutex_lock_interruptible(&bo->lock);
+	if (ret)
+		goto put_bo;
+
+	if (!bo->sliced) {
+		ret = -EINVAL;
+		goto unlock_bo;
+	}
+
+	dbc = bo->dbc;
+	rcu_id = srcu_read_lock(&dbc->ch_lock);
+	if (dbc->usr != usr) {
+		ret = -EINVAL;
+		goto unlock_ch_srcu;
+	}
+
+	/* Check if BO is committed to H/W for DMA */
+	spin_lock_irqsave(&dbc->xfer_lock, flags);
+	if (bo_queued(bo)) {
+		spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+		ret = -EBUSY;
+		goto unlock_ch_srcu;
+	}
+	spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+
+	detach_slice_bo(qdev, bo);
+
+unlock_ch_srcu:
+	srcu_read_unlock(&dbc->ch_lock, rcu_id);
+unlock_bo:
+	mutex_unlock(&bo->lock);
+put_bo:
+	drm_gem_object_put(obj);
+unlock_dev_srcu:
+	srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+unlock_usr_srcu:
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	return ret;
+}
+
+static void empty_xfer_list(struct qaic_device *qdev, struct dma_bridge_chan *dbc)
+{
+	unsigned long flags;
+	struct qaic_bo *bo;
+
+	spin_lock_irqsave(&dbc->xfer_lock, flags);
+	while (!list_empty(&dbc->xfer_list)) {
+		bo = list_first_entry(&dbc->xfer_list, typeof(*bo), xfer_list);
+		list_del_init(&bo->xfer_list);
+		spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+		bo->nr_slice_xfer_done = 0;
+		bo->req_id = 0;
+		bo->perf_stats.req_received_ts = 0;
+		bo->perf_stats.req_submit_ts = 0;
+		bo->perf_stats.req_processed_ts = 0;
+		bo->perf_stats.queue_level_before = 0;
+		dma_sync_sgtable_for_cpu(&qdev->pdev->dev, bo->sgt, bo->dir);
+		complete_all(&bo->xfer_done);
+		drm_gem_object_put(&bo->base);
+		spin_lock_irqsave(&dbc->xfer_lock, flags);
+	}
+	spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+}
+
+static void sync_empty_xfer_list(struct qaic_device *qdev, struct dma_bridge_chan *dbc)
+{
+	empty_xfer_list(qdev, dbc);
+	synchronize_srcu(&dbc->ch_lock);
+	/*
+	 * Threads holding channel lock, may add more elements in the xfer_list.
+	 * Flush out these elements from xfer_list.
+	 */
+	empty_xfer_list(qdev, dbc);
+}
+
+int disable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr)
+{
+	if (!qdev->dbc[dbc_id].usr || qdev->dbc[dbc_id].usr->handle != usr->handle)
+		return -EPERM;
+
+	qdev->dbc[dbc_id].usr = NULL;
+	synchronize_srcu(&qdev->dbc[dbc_id].ch_lock);
+	return 0;
+}
+
+/**
+ * enable_dbc - Enable the DBC. DBCs are disabled by removing the context of
+ * user. Add user context back to DBC to enable it. This function trusts the
+ * DBC ID passed and expects the DBC to be disabled.
+ * @qdev: qaic device handle
+ * @dbc_id: ID of the DBC
+ * @usr: User context
+ */
+void enable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr)
+{
+	qdev->dbc[dbc_id].usr = usr;
+}
+
+void wakeup_dbc(struct qaic_device *qdev, u32 dbc_id)
+{
+	struct dma_bridge_chan *dbc = &qdev->dbc[dbc_id];
+
+	dbc->usr = NULL;
+	sync_empty_xfer_list(qdev, dbc);
+}
+
+void release_dbc(struct qaic_device *qdev, u32 dbc_id)
+{
+	struct qaic_bo *bo, *bo_temp;
+	struct dma_bridge_chan *dbc;
+
+	dbc = &qdev->dbc[dbc_id];
+	if (!dbc->in_use)
+		return;
+
+	wakeup_dbc(qdev, dbc_id);
+
+	dma_free_coherent(&qdev->pdev->dev, dbc->total_size, dbc->req_q_base, dbc->dma_addr);
+	dbc->total_size = 0;
+	dbc->req_q_base = NULL;
+	dbc->dma_addr = 0;
+	dbc->nelem = 0;
+	dbc->usr = NULL;
+
+	list_for_each_entry_safe(bo, bo_temp, &dbc->bo_lists, bo_list) {
+		drm_gem_object_get(&bo->base);
+		mutex_lock(&bo->lock);
+		detach_slice_bo(qdev, bo);
+		mutex_unlock(&bo->lock);
+		drm_gem_object_put(&bo->base);
+	}
+
+	dbc->in_use = false;
+	wake_up(&dbc->dbc_release);
+}
+
+void qaic_data_get_fifo_info(struct dma_bridge_chan *dbc, u32 *head, u32 *tail)
+{
+	if (!dbc || !head || !tail)
+		return;
+
+	*head = readl(dbc->dbc_base + REQHP_OFF);
+	*tail = readl(dbc->dbc_base + REQTP_OFF);
+}
+
+/*
+ * qaic_dbc_enter_ssr - Prepare to enter in sub system reset(SSR) for given DBC ID.
+ * @qdev: qaic device handle
+ * @dbc_id: ID of the DBC which will enter SSR
+ *
+ * The device will automatically deactivate the workload as not
+ * all errors can be silently recovered. The user will be
+ * notified and will need to decide the required recovery
+ * action to take.
+ */
+void qaic_dbc_enter_ssr(struct qaic_device *qdev, u32 dbc_id)
+{
+	qdev->ssr_dbc = dbc_id;
+	release_dbc(qdev, dbc_id);
+}
+
+/*
+ * qaic_dbc_exit_ssr - Prepare to exit from sub system reset(SSR) for given DBC ID.
+ * @qdev: qaic device handle
+ *
+ * The DBC returns to an operational state and begins accepting work after exiting SSR.
+ */
+void qaic_dbc_exit_ssr(struct qaic_device *qdev)
+{
+	qdev->ssr_dbc = QAIC_SSR_DBC_SENTINEL;
+}
diff --git a/drivers/accel/qaic/qaic_debugfs.c b/drivers/accel/qaic/qaic_debugfs.c
new file mode 100644
index 000000000..8dc4fe5bb
--- /dev/null
+++ b/drivers/accel/qaic/qaic_debugfs.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2020, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/mhi.h>
+#include <linux/mutex.h>
+#include <linux/overflow.h>
+#include <linux/pci.h>
+#include <linux/seq_file.h>
+#include <linux/sprintf.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "qaic.h"
+#include "qaic_debugfs.h"
+
+#define BOOTLOG_POOL_SIZE		16
+#define BOOTLOG_MSG_SIZE		512
+#define QAIC_DBC_DIR_NAME		9
+
+struct bootlog_msg {
+	/* Buffer for bootlog messages */
+	char str[BOOTLOG_MSG_SIZE];
+	/* Root struct of device, used to access device resources */
+	struct qaic_device *qdev;
+	/* Work struct to schedule work coming on QAIC_LOGGING channel */
+	struct work_struct work;
+};
+
+struct bootlog_page {
+	/* Node in list of bootlog pages maintained by root device struct */
+	struct list_head node;
+	/* Total size of the buffer that holds the bootlogs. It is PAGE_SIZE */
+	unsigned int size;
+	/* Offset for the next bootlog */
+	unsigned int offset;
+};
+
+static int bootlog_show(struct seq_file *s, void *unused)
+{
+	struct bootlog_page *page;
+	struct qaic_device *qdev;
+	void *page_end;
+	void *log;
+
+	qdev = s->private;
+	mutex_lock(&qdev->bootlog_mutex);
+	list_for_each_entry(page, &qdev->bootlog, node) {
+		log = page + 1;
+		page_end = (void *)page + page->offset;
+		while (log < page_end) {
+			seq_printf(s, "%s", (char *)log);
+			log += strlen(log) + 1;
+		}
+	}
+	mutex_unlock(&qdev->bootlog_mutex);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(bootlog);
+
+static int fifo_size_show(struct seq_file *s, void *unused)
+{
+	struct dma_bridge_chan *dbc = s->private;
+
+	seq_printf(s, "%u\n", dbc->nelem);
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(fifo_size);
+
+static int queued_show(struct seq_file *s, void *unused)
+{
+	struct dma_bridge_chan *dbc = s->private;
+	u32 tail = 0, head = 0;
+
+	qaic_data_get_fifo_info(dbc, &head, &tail);
+
+	if (head == U32_MAX || tail == U32_MAX)
+		seq_printf(s, "%u\n", 0);
+	else if (head > tail)
+		seq_printf(s, "%u\n", dbc->nelem - head + tail);
+	else
+		seq_printf(s, "%u\n", tail - head);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(queued);
+
+void qaic_debugfs_init(struct qaic_drm_device *qddev)
+{
+	struct qaic_device *qdev = qddev->qdev;
+	struct dentry *debugfs_root;
+	struct dentry *debugfs_dir;
+	char name[QAIC_DBC_DIR_NAME];
+	u32 i;
+
+	debugfs_root = to_drm(qddev)->debugfs_root;
+
+	debugfs_create_file("bootlog", 0400, debugfs_root, qdev, &bootlog_fops);
+	/*
+	 * 256 dbcs per device is likely the max we will ever see and lets static checking see a
+	 * reasonable range.
+	 */
+	for (i = 0; i < qdev->num_dbc && i < 256; ++i) {
+		snprintf(name, QAIC_DBC_DIR_NAME, "dbc%03u", i);
+		debugfs_dir = debugfs_create_dir(name, debugfs_root);
+		debugfs_create_file("fifo_size", 0400, debugfs_dir, &qdev->dbc[i], &fifo_size_fops);
+		debugfs_create_file("queued", 0400, debugfs_dir, &qdev->dbc[i], &queued_fops);
+	}
+}
+
+static struct bootlog_page *alloc_bootlog_page(struct qaic_device *qdev)
+{
+	struct bootlog_page *page;
+
+	page = (struct bootlog_page *)devm_get_free_pages(&qdev->pdev->dev, GFP_KERNEL, 0);
+	if (!page)
+		return page;
+
+	page->size = PAGE_SIZE;
+	page->offset = sizeof(*page);
+	list_add_tail(&page->node, &qdev->bootlog);
+
+	return page;
+}
+
+static int reset_bootlog(struct qaic_device *qdev)
+{
+	struct bootlog_page *page;
+	struct bootlog_page *i;
+
+	mutex_lock(&qdev->bootlog_mutex);
+	list_for_each_entry_safe(page, i, &qdev->bootlog, node) {
+		list_del(&page->node);
+		devm_free_pages(&qdev->pdev->dev, (unsigned long)page);
+	}
+
+	page = alloc_bootlog_page(qdev);
+	mutex_unlock(&qdev->bootlog_mutex);
+	if (!page)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void *bootlog_get_space(struct qaic_device *qdev, unsigned int size)
+{
+	struct bootlog_page *page;
+
+	page = list_last_entry(&qdev->bootlog, struct bootlog_page, node);
+
+	if (size_add(size, sizeof(*page)) > page->size)
+		return NULL;
+
+	if (page->offset + size > page->size) {
+		page = alloc_bootlog_page(qdev);
+		if (!page)
+			return NULL;
+	}
+
+	return (void *)page + page->offset;
+}
+
+static void bootlog_commit(struct qaic_device *qdev, unsigned int size)
+{
+	struct bootlog_page *page;
+
+	page = list_last_entry(&qdev->bootlog, struct bootlog_page, node);
+
+	page->offset += size;
+}
+
+static void bootlog_log(struct work_struct *work)
+{
+	struct bootlog_msg *msg = container_of(work, struct bootlog_msg, work);
+	unsigned int len = strlen(msg->str) + 1;
+	struct qaic_device *qdev = msg->qdev;
+	void *log;
+
+	mutex_lock(&qdev->bootlog_mutex);
+	log = bootlog_get_space(qdev, len);
+	if (log) {
+		memcpy(log, msg, len);
+		bootlog_commit(qdev, len);
+	}
+	mutex_unlock(&qdev->bootlog_mutex);
+
+	if (mhi_queue_buf(qdev->bootlog_ch, DMA_FROM_DEVICE, msg, BOOTLOG_MSG_SIZE, MHI_EOT))
+		devm_kfree(&qdev->pdev->dev, msg);
+}
+
+static int qaic_bootlog_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+	struct bootlog_msg *msg;
+	int i, ret;
+
+	qdev->bootlog_wq = alloc_ordered_workqueue("qaic_bootlog", 0);
+	if (!qdev->bootlog_wq) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = reset_bootlog(qdev);
+	if (ret)
+		goto destroy_workqueue;
+
+	ret = mhi_prepare_for_transfer(mhi_dev);
+	if (ret)
+		goto destroy_workqueue;
+
+	dev_set_drvdata(&mhi_dev->dev, qdev);
+	qdev->bootlog_ch = mhi_dev;
+
+	for (i = 0; i < BOOTLOG_POOL_SIZE; i++) {
+		msg = devm_kzalloc(&qdev->pdev->dev, sizeof(*msg), GFP_KERNEL);
+		if (!msg) {
+			ret = -ENOMEM;
+			goto mhi_unprepare;
+		}
+
+		msg->qdev = qdev;
+		INIT_WORK(&msg->work, bootlog_log);
+
+		ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, msg, BOOTLOG_MSG_SIZE, MHI_EOT);
+		if (ret)
+			goto mhi_unprepare;
+	}
+
+	return 0;
+
+mhi_unprepare:
+	mhi_unprepare_from_transfer(mhi_dev);
+destroy_workqueue:
+	destroy_workqueue(qdev->bootlog_wq);
+out:
+	return ret;
+}
+
+static void qaic_bootlog_mhi_remove(struct mhi_device *mhi_dev)
+{
+	struct qaic_device *qdev;
+
+	qdev = dev_get_drvdata(&mhi_dev->dev);
+
+	mhi_unprepare_from_transfer(qdev->bootlog_ch);
+	destroy_workqueue(qdev->bootlog_wq);
+	qdev->bootlog_ch = NULL;
+}
+
+static void qaic_bootlog_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+}
+
+static void qaic_bootlog_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct qaic_device *qdev = dev_get_drvdata(&mhi_dev->dev);
+	struct bootlog_msg *msg = mhi_result->buf_addr;
+
+	if (mhi_result->transaction_status) {
+		devm_kfree(&qdev->pdev->dev, msg);
+		return;
+	}
+
+	/* Force a null at the end of the transferred string */
+	msg->str[mhi_result->bytes_xferd - 1] = 0;
+
+	queue_work(qdev->bootlog_wq, &msg->work);
+}
+
+static const struct mhi_device_id qaic_bootlog_mhi_match_table[] = {
+	{ .chan = "QAIC_LOGGING", },
+	{},
+};
+
+static struct mhi_driver qaic_bootlog_mhi_driver = {
+	.id_table = qaic_bootlog_mhi_match_table,
+	.remove = qaic_bootlog_mhi_remove,
+	.probe = qaic_bootlog_mhi_probe,
+	.ul_xfer_cb = qaic_bootlog_mhi_ul_xfer_cb,
+	.dl_xfer_cb = qaic_bootlog_mhi_dl_xfer_cb,
+	.driver = {
+		.name = "qaic_bootlog",
+	},
+};
+
+int qaic_bootlog_register(void)
+{
+	return mhi_driver_register(&qaic_bootlog_mhi_driver);
+}
+
+void qaic_bootlog_unregister(void)
+{
+	mhi_driver_unregister(&qaic_bootlog_mhi_driver);
+}
diff --git a/drivers/accel/qaic/qaic_debugfs.h b/drivers/accel/qaic/qaic_debugfs.h
new file mode 100644
index 000000000..05e74f84c
--- /dev/null
+++ b/drivers/accel/qaic/qaic_debugfs.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* Copyright (c) 2020, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#ifndef __QAIC_DEBUGFS_H__
+#define __QAIC_DEBUGFS_H__
+
+#include <drm/drm_file.h>
+
+#ifdef CONFIG_DEBUG_FS
+int qaic_bootlog_register(void);
+void qaic_bootlog_unregister(void);
+void qaic_debugfs_init(struct qaic_drm_device *qddev);
+#else
+static inline int qaic_bootlog_register(void) { return 0; }
+static inline void qaic_bootlog_unregister(void) {}
+static inline void qaic_debugfs_init(struct qaic_drm_device *qddev) {}
+#endif /* CONFIG_DEBUG_FS */
+#endif /* __QAIC_DEBUGFS_H__ */
diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c
new file mode 100644
index 000000000..63fb8c7b4
--- /dev/null
+++ b/drivers/accel/qaic/qaic_drv.c
@@ -0,0 +1,860 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2019-2021, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/kobject.h>
+#include <linux/kref.h>
+#include <linux/mhi.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/wait.h>
+#include <drm/drm_accel.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_file.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_managed.h>
+#include <uapi/drm/qaic_accel.h>
+
+#include "mhi_controller.h"
+#include "qaic.h"
+#include "qaic_debugfs.h"
+#include "qaic_ras.h"
+#include "qaic_ssr.h"
+#include "qaic_timesync.h"
+#include "sahara.h"
+
+MODULE_IMPORT_NS("DMA_BUF");
+
+#define PCI_DEVICE_ID_QCOM_AIC080	0xa080
+#define PCI_DEVICE_ID_QCOM_AIC100	0xa100
+#define PCI_DEVICE_ID_QCOM_AIC200	0xa110
+#define QAIC_NAME			"qaic"
+#define QAIC_DESC			"Qualcomm Cloud AI Accelerators"
+#define CNTL_MAJOR			5
+#define CNTL_MINOR			0
+
+struct qaic_device_config {
+	/* Indicates the AIC family the device belongs to */
+	int family;
+	/* A bitmask representing the available BARs */
+	int bar_mask;
+	/* An index value used to identify the MHI controller BAR */
+	unsigned int mhi_bar_idx;
+	/* An index value used to identify the DBCs BAR */
+	unsigned int dbc_bar_idx;
+};
+
+static const struct qaic_device_config aic080_config = {
+	.family = FAMILY_AIC100,
+	.bar_mask = BIT(0) | BIT(2) | BIT(4),
+	.mhi_bar_idx = 0,
+	.dbc_bar_idx = 2,
+};
+
+static const struct qaic_device_config aic100_config = {
+	.family = FAMILY_AIC100,
+	.bar_mask = BIT(0) | BIT(2) | BIT(4),
+	.mhi_bar_idx = 0,
+	.dbc_bar_idx = 2,
+};
+
+static const struct qaic_device_config aic200_config = {
+	.family = FAMILY_AIC200,
+	.bar_mask = BIT(0) | BIT(1) | BIT(2) | BIT(4),
+	.mhi_bar_idx = 1,
+	.dbc_bar_idx = 2,
+};
+
+bool datapath_polling;
+module_param(datapath_polling, bool, 0400);
+MODULE_PARM_DESC(datapath_polling, "Operate the datapath in polling mode");
+static bool link_up;
+static DEFINE_IDA(qaic_usrs);
+
+static void qaicm_wq_release(struct drm_device *dev, void *res)
+{
+	struct workqueue_struct *wq = res;
+
+	destroy_workqueue(wq);
+}
+
+static struct workqueue_struct *qaicm_wq_init(struct drm_device *dev, const char *name)
+{
+	struct workqueue_struct *wq;
+	int ret;
+
+	wq = alloc_workqueue("%s", WQ_UNBOUND, 0, name);
+	if (!wq)
+		return ERR_PTR(-ENOMEM);
+	ret = drmm_add_action_or_reset(dev, qaicm_wq_release, wq);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return wq;
+}
+
+static void qaicm_srcu_release(struct drm_device *dev, void *res)
+{
+	struct srcu_struct *lock = res;
+
+	cleanup_srcu_struct(lock);
+}
+
+static int qaicm_srcu_init(struct drm_device *dev, struct srcu_struct *lock)
+{
+	int ret;
+
+	ret = init_srcu_struct(lock);
+	if (ret)
+		return ret;
+
+	return drmm_add_action_or_reset(dev, qaicm_srcu_release, lock);
+}
+
+static void qaicm_pci_release(struct drm_device *dev, void *res)
+{
+	struct qaic_device *qdev = to_qaic_device(dev);
+
+	pci_set_drvdata(qdev->pdev, NULL);
+}
+
+static void free_usr(struct kref *kref)
+{
+	struct qaic_user *usr = container_of(kref, struct qaic_user, ref_count);
+
+	cleanup_srcu_struct(&usr->qddev_lock);
+	ida_free(&qaic_usrs, usr->handle);
+	kfree(usr);
+}
+
+static int qaic_open(struct drm_device *dev, struct drm_file *file)
+{
+	struct qaic_drm_device *qddev = to_qaic_drm_device(dev);
+	struct qaic_device *qdev = qddev->qdev;
+	struct qaic_user *usr;
+	int rcu_id;
+	int ret;
+
+	rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		ret = -ENODEV;
+		goto dev_unlock;
+	}
+
+	usr = kmalloc_obj(*usr);
+	if (!usr) {
+		ret = -ENOMEM;
+		goto dev_unlock;
+	}
+
+	usr->handle = ida_alloc(&qaic_usrs, GFP_KERNEL);
+	if (usr->handle < 0) {
+		ret = usr->handle;
+		goto free_usr;
+	}
+	usr->qddev = qddev;
+	atomic_set(&usr->chunk_id, 0);
+	init_srcu_struct(&usr->qddev_lock);
+	kref_init(&usr->ref_count);
+
+	ret = mutex_lock_interruptible(&qddev->users_mutex);
+	if (ret)
+		goto cleanup_usr;
+
+	list_add(&usr->node, &qddev->users);
+	mutex_unlock(&qddev->users_mutex);
+
+	file->driver_priv = usr;
+
+	srcu_read_unlock(&qdev->dev_lock, rcu_id);
+	return 0;
+
+cleanup_usr:
+	cleanup_srcu_struct(&usr->qddev_lock);
+	ida_free(&qaic_usrs, usr->handle);
+free_usr:
+	kfree(usr);
+dev_unlock:
+	srcu_read_unlock(&qdev->dev_lock, rcu_id);
+	return ret;
+}
+
+static void qaic_postclose(struct drm_device *dev, struct drm_file *file)
+{
+	struct qaic_user *usr = file->driver_priv;
+	struct qaic_drm_device *qddev;
+	struct qaic_device *qdev;
+	int qdev_rcu_id;
+	int usr_rcu_id;
+	int i;
+
+	qddev = usr->qddev;
+	usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
+	if (qddev) {
+		qdev = qddev->qdev;
+		qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+		if (qdev->dev_state == QAIC_ONLINE) {
+			qaic_release_usr(qdev, usr);
+			for (i = 0; i < qdev->num_dbc; ++i)
+				if (qdev->dbc[i].usr && qdev->dbc[i].usr->handle == usr->handle)
+					release_dbc(qdev, i);
+		}
+		srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
+
+		mutex_lock(&qddev->users_mutex);
+		if (!list_empty(&usr->node))
+			list_del_init(&usr->node);
+		mutex_unlock(&qddev->users_mutex);
+	}
+
+	srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
+	kref_put(&usr->ref_count, free_usr);
+
+	file->driver_priv = NULL;
+}
+
+DEFINE_DRM_ACCEL_FOPS(qaic_accel_fops);
+
+static const struct drm_ioctl_desc qaic_drm_ioctls[] = {
+	DRM_IOCTL_DEF_DRV(QAIC_MANAGE, qaic_manage_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_CREATE_BO, qaic_create_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_MMAP_BO, qaic_mmap_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_ATTACH_SLICE_BO, qaic_attach_slice_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_EXECUTE_BO, qaic_execute_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_PARTIAL_EXECUTE_BO, qaic_partial_execute_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_WAIT_BO, qaic_wait_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_PERF_STATS_BO, qaic_perf_stats_bo_ioctl, 0),
+	DRM_IOCTL_DEF_DRV(QAIC_DETACH_SLICE_BO, qaic_detach_slice_bo_ioctl, 0),
+};
+
+static const struct drm_driver qaic_accel_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_COMPUTE_ACCEL,
+
+	.name			= QAIC_NAME,
+	.desc			= QAIC_DESC,
+
+	.fops			= &qaic_accel_fops,
+	.open			= qaic_open,
+	.postclose		= qaic_postclose,
+
+	.ioctls			= qaic_drm_ioctls,
+	.num_ioctls		= ARRAY_SIZE(qaic_drm_ioctls),
+	.gem_prime_import	= qaic_gem_prime_import,
+};
+
+static int qaic_create_drm_device(struct qaic_device *qdev, s32 partition_id)
+{
+	struct qaic_drm_device *qddev = qdev->qddev;
+	struct drm_device *drm = to_drm(qddev);
+	int ret;
+
+	/* Hold off implementing partitions until the uapi is determined */
+	if (partition_id != QAIC_NO_PARTITION)
+		return -EINVAL;
+
+	qddev->partition_id = partition_id;
+
+	ret = drm_dev_register(drm, 0);
+	if (ret) {
+		pci_dbg(qdev->pdev, "drm_dev_register failed %d\n", ret);
+		return ret;
+	}
+
+	ret = qaic_sysfs_init(qddev);
+	if (ret) {
+		drm_dev_unregister(drm);
+		pci_dbg(qdev->pdev, "qaic_sysfs_init failed %d\n", ret);
+		return ret;
+	}
+
+	qaic_debugfs_init(qddev);
+
+	return ret;
+}
+
+static void qaic_destroy_drm_device(struct qaic_device *qdev, s32 partition_id)
+{
+	struct qaic_drm_device *qddev = qdev->qddev;
+	struct drm_device *drm = to_drm(qddev);
+	struct qaic_user *usr;
+
+	qaic_sysfs_remove(qddev);
+	drm_dev_unregister(drm);
+	qddev->partition_id = 0;
+	/*
+	 * Existing users get unresolvable errors till they close FDs.
+	 * Need to sync carefully with users calling close(). The
+	 * list of users can be modified elsewhere when the lock isn't
+	 * held here, but the sync'ing the srcu with the mutex held
+	 * could deadlock. Grab the mutex so that the list will be
+	 * unmodified. The user we get will exist as long as the
+	 * lock is held. Signal that the qcdev is going away, and
+	 * grab a reference to the user so they don't go away for
+	 * synchronize_srcu(). Then release the mutex to avoid
+	 * deadlock and make sure the user has observed the signal.
+	 * With the lock released, we cannot maintain any state of the
+	 * user list.
+	 */
+	mutex_lock(&qddev->users_mutex);
+	while (!list_empty(&qddev->users)) {
+		usr = list_first_entry(&qddev->users, struct qaic_user, node);
+		list_del_init(&usr->node);
+		kref_get(&usr->ref_count);
+		usr->qddev = NULL;
+		mutex_unlock(&qddev->users_mutex);
+		synchronize_srcu(&usr->qddev_lock);
+		kref_put(&usr->ref_count, free_usr);
+		mutex_lock(&qddev->users_mutex);
+	}
+	mutex_unlock(&qddev->users_mutex);
+}
+
+static int qaic_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+	u16 major = -1, minor = -1;
+	struct qaic_device *qdev;
+	int ret;
+
+	/*
+	 * Invoking this function indicates that the control channel to the
+	 * device is available. We use that as a signal to indicate that
+	 * the device side firmware has booted. The device side firmware
+	 * manages the device resources, so we need to communicate with it
+	 * via the control channel in order to utilize the device. Therefore
+	 * we wait until this signal to create the drm dev that userspace will
+	 * use to control the device, because without the device side firmware,
+	 * userspace can't do anything useful.
+	 */
+
+	qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+
+	dev_set_drvdata(&mhi_dev->dev, qdev);
+	qdev->cntl_ch = mhi_dev;
+
+	ret = qaic_control_open(qdev);
+	if (ret) {
+		pci_dbg(qdev->pdev, "%s: control_open failed %d\n", __func__, ret);
+		return ret;
+	}
+
+	qdev->dev_state = QAIC_BOOT;
+	ret = get_cntl_version(qdev, NULL, &major, &minor);
+	if (ret || major != CNTL_MAJOR || minor > CNTL_MINOR) {
+		pci_err(qdev->pdev, "%s: Control protocol version (%d.%d) not supported. Supported version is (%d.%d). Ret: %d\n",
+			__func__, major, minor, CNTL_MAJOR, CNTL_MINOR, ret);
+		ret = -EINVAL;
+		goto close_control;
+	}
+	qdev->dev_state = QAIC_ONLINE;
+	kobject_uevent(&(to_accel_kdev(qdev->qddev))->kobj, KOBJ_ONLINE);
+
+	return ret;
+
+close_control:
+	qaic_control_close(qdev);
+	return ret;
+}
+
+static void qaic_mhi_remove(struct mhi_device *mhi_dev)
+{
+/* This is redundant since we have already observed the device crash */
+}
+
+static void qaic_notify_reset(struct qaic_device *qdev)
+{
+	int i;
+
+	kobject_uevent(&(to_accel_kdev(qdev->qddev))->kobj, KOBJ_OFFLINE);
+	qdev->dev_state = QAIC_OFFLINE;
+	/* wake up any waiters to avoid waiting for timeouts at sync */
+	wake_all_cntl(qdev);
+	for (i = 0; i < qdev->num_dbc; ++i)
+		wakeup_dbc(qdev, i);
+	synchronize_srcu(&qdev->dev_lock);
+}
+
+void qaic_dev_reset_clean_local_state(struct qaic_device *qdev)
+{
+	int i;
+
+	qaic_notify_reset(qdev);
+
+	/* start tearing things down */
+	qaic_clean_up_ssr(qdev);
+	for (i = 0; i < qdev->num_dbc; ++i)
+		release_dbc(qdev, i);
+}
+
+static struct qaic_device *create_qdev(struct pci_dev *pdev,
+				       const struct qaic_device_config *config)
+{
+	struct device *dev = &pdev->dev;
+	struct qaic_drm_device *qddev;
+	struct qaic_device *qdev;
+	struct drm_device *drm;
+	int i, ret;
+
+	qdev = devm_kzalloc(dev, sizeof(*qdev), GFP_KERNEL);
+	if (!qdev)
+		return NULL;
+
+	qdev->dev_state = QAIC_OFFLINE;
+	qdev->num_dbc = 16;
+	qdev->dbc = devm_kcalloc(dev, qdev->num_dbc, sizeof(*qdev->dbc), GFP_KERNEL);
+	if (!qdev->dbc)
+		return NULL;
+
+	qddev = devm_drm_dev_alloc(&pdev->dev, &qaic_accel_driver, struct qaic_drm_device, drm);
+	if (IS_ERR(qddev))
+		return NULL;
+
+	drm = to_drm(qddev);
+	pci_set_drvdata(pdev, qdev);
+
+	ret = drmm_mutex_init(drm, &qddev->users_mutex);
+	if (ret)
+		return NULL;
+	ret = drmm_add_action_or_reset(drm, qaicm_pci_release, NULL);
+	if (ret)
+		return NULL;
+	ret = drmm_mutex_init(drm, &qdev->cntl_mutex);
+	if (ret)
+		return NULL;
+	ret = drmm_mutex_init(drm, &qdev->bootlog_mutex);
+	if (ret)
+		return NULL;
+
+	qdev->cntl_wq = qaicm_wq_init(drm, "qaic_cntl");
+	if (IS_ERR(qdev->cntl_wq))
+		return NULL;
+	qdev->qts_wq = qaicm_wq_init(drm, "qaic_ts");
+	if (IS_ERR(qdev->qts_wq))
+		return NULL;
+	qdev->ssr_wq = qaicm_wq_init(drm, "qaic_ssr");
+	if (IS_ERR(qdev->ssr_wq))
+		return NULL;
+
+	ret = qaicm_srcu_init(drm, &qdev->dev_lock);
+	if (ret)
+		return NULL;
+
+	ret = qaic_ssr_init(qdev, drm);
+	if (ret)
+		pci_info(pdev, "QAIC SSR crashdump collection not supported.\n");
+
+	qdev->qddev = qddev;
+	qdev->pdev = pdev;
+	qddev->qdev = qdev;
+
+	INIT_LIST_HEAD(&qdev->cntl_xfer_list);
+	INIT_LIST_HEAD(&qdev->bootlog);
+	INIT_LIST_HEAD(&qddev->users);
+
+	for (i = 0; i < qdev->num_dbc; ++i) {
+		spin_lock_init(&qdev->dbc[i].xfer_lock);
+		qdev->dbc[i].qdev = qdev;
+		qdev->dbc[i].id = i;
+		INIT_LIST_HEAD(&qdev->dbc[i].xfer_list);
+		ret = qaicm_srcu_init(drm, &qdev->dbc[i].ch_lock);
+		if (ret)
+			return NULL;
+		init_waitqueue_head(&qdev->dbc[i].dbc_release);
+		INIT_LIST_HEAD(&qdev->dbc[i].bo_lists);
+		ret = drmm_mutex_init(drm, &qdev->dbc[i].req_lock);
+		if (ret)
+			return NULL;
+	}
+
+	return qdev;
+}
+
+static int init_pci(struct qaic_device *qdev, struct pci_dev *pdev,
+		    const struct qaic_device_config *config)
+{
+	int bars;
+	int ret;
+
+	bars = pci_select_bars(pdev, IORESOURCE_MEM) & 0x3f;
+
+	/* make sure the device has the expected BARs */
+	if (bars != config->bar_mask) {
+		pci_dbg(pdev, "%s: expected BARs %#x not found in device. Found %#x\n",
+			__func__, config->bar_mask, bars);
+		return -EINVAL;
+	}
+
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret)
+		return ret;
+	dma_set_max_seg_size(&pdev->dev, UINT_MAX);
+
+	qdev->bar_mhi = devm_ioremap_resource(&pdev->dev, &pdev->resource[config->mhi_bar_idx]);
+	if (IS_ERR(qdev->bar_mhi))
+		return PTR_ERR(qdev->bar_mhi);
+
+	qdev->bar_dbc = devm_ioremap_resource(&pdev->dev, &pdev->resource[config->dbc_bar_idx]);
+	if (IS_ERR(qdev->bar_dbc))
+		return PTR_ERR(qdev->bar_dbc);
+
+	/* Managed release since we use pcim_enable_device above */
+	pci_set_master(pdev);
+
+	return 0;
+}
+
+static int init_msi(struct qaic_device *qdev, struct pci_dev *pdev)
+{
+	int irq_count = qdev->num_dbc + 1;
+	int mhi_irq;
+	int ret;
+	int i;
+
+	/* Managed release since we use pcim_enable_device */
+	ret = pci_alloc_irq_vectors(pdev, irq_count, irq_count, PCI_IRQ_MSI | PCI_IRQ_MSIX);
+	if (ret == -ENOSPC) {
+		ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI | PCI_IRQ_MSIX);
+		if (ret < 0)
+			return ret;
+
+		/*
+		 * Operate in one MSI mode. All interrupts will be directed to
+		 * MSI0; every interrupt will wake up all the interrupt handlers
+		 * (MHI and DBC[0-15]). Since the interrupt is now shared, it is
+		 * not disabled during DBC threaded handler, but only one thread
+		 * will be allowed to run per DBC, so while it can be
+		 * interrupted, it shouldn't race with itself.
+		 */
+		qdev->single_msi = true;
+		pci_info(pdev, "Allocating %d MSIs failed, operating in 1 MSI mode. Performance may be impacted.\n",
+			 irq_count);
+	} else if (ret < 0) {
+		return ret;
+	}
+
+	mhi_irq = pci_irq_vector(pdev, 0);
+	if (mhi_irq < 0)
+		return mhi_irq;
+
+	for (i = 0; i < qdev->num_dbc; ++i) {
+		ret = devm_request_threaded_irq(&pdev->dev,
+						pci_irq_vector(pdev, qdev->single_msi ? 0 : i + 1),
+						dbc_irq_handler, dbc_irq_threaded_fn, IRQF_SHARED,
+						"qaic_dbc", &qdev->dbc[i]);
+		if (ret)
+			return ret;
+
+		if (datapath_polling) {
+			qdev->dbc[i].irq = pci_irq_vector(pdev, qdev->single_msi ? 0 : i + 1);
+			if (!qdev->single_msi)
+				disable_irq_nosync(qdev->dbc[i].irq);
+			INIT_WORK(&qdev->dbc[i].poll_work, qaic_irq_polling_work);
+		}
+	}
+
+	return mhi_irq;
+}
+
+static int qaic_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct qaic_device_config *config = (struct qaic_device_config *)id->driver_data;
+	struct qaic_device *qdev;
+	int mhi_irq;
+	int ret;
+	int i;
+
+	qdev = create_qdev(pdev, config);
+	if (!qdev)
+		return -ENOMEM;
+
+	ret = init_pci(qdev, pdev, config);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < qdev->num_dbc; ++i)
+		qdev->dbc[i].dbc_base = qdev->bar_dbc + QAIC_DBC_OFF(i);
+
+	mhi_irq = init_msi(qdev, pdev);
+	if (mhi_irq < 0)
+		return mhi_irq;
+
+	ret = qaic_create_drm_device(qdev, QAIC_NO_PARTITION);
+	if (ret)
+		return ret;
+
+	qdev->mhi_cntrl = qaic_mhi_register_controller(pdev, qdev->bar_mhi, mhi_irq,
+						       qdev->single_msi, config->family);
+	if (IS_ERR(qdev->mhi_cntrl)) {
+		ret = PTR_ERR(qdev->mhi_cntrl);
+		qaic_destroy_drm_device(qdev, QAIC_NO_PARTITION);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void qaic_pci_remove(struct pci_dev *pdev)
+{
+	struct qaic_device *qdev = pci_get_drvdata(pdev);
+
+	if (!qdev)
+		return;
+
+	qaic_dev_reset_clean_local_state(qdev);
+	qaic_mhi_free_controller(qdev->mhi_cntrl, link_up);
+	qaic_destroy_drm_device(qdev, QAIC_NO_PARTITION);
+}
+
+static void qaic_pci_shutdown(struct pci_dev *pdev)
+{
+	/* see qaic_exit for what link_up is doing */
+	link_up = true;
+	qaic_pci_remove(pdev);
+}
+
+static pci_ers_result_t qaic_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t error)
+{
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static void qaic_pci_reset_prepare(struct pci_dev *pdev)
+{
+	struct qaic_device *qdev = pci_get_drvdata(pdev);
+
+	qaic_notify_reset(qdev);
+	qaic_mhi_start_reset(qdev->mhi_cntrl);
+	qaic_dev_reset_clean_local_state(qdev);
+}
+
+static void qaic_pci_reset_done(struct pci_dev *pdev)
+{
+	struct qaic_device *qdev = pci_get_drvdata(pdev);
+
+	qaic_mhi_reset_done(qdev->mhi_cntrl);
+}
+
+static const struct mhi_device_id qaic_mhi_match_table[] = {
+	{ .chan = "QAIC_CONTROL", },
+	{},
+};
+
+static struct mhi_driver qaic_mhi_driver = {
+	.id_table = qaic_mhi_match_table,
+	.remove = qaic_mhi_remove,
+	.probe = qaic_mhi_probe,
+	.ul_xfer_cb = qaic_mhi_ul_xfer_cb,
+	.dl_xfer_cb = qaic_mhi_dl_xfer_cb,
+	.driver = {
+		.name = "qaic_mhi",
+	},
+};
+
+static const struct pci_device_id qaic_ids[] = {
+	{ PCI_DEVICE_DATA(QCOM, AIC080, (kernel_ulong_t)&aic080_config), },
+	{ PCI_DEVICE_DATA(QCOM, AIC100, (kernel_ulong_t)&aic100_config), },
+	{ PCI_DEVICE_DATA(QCOM, AIC200, (kernel_ulong_t)&aic200_config), },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, qaic_ids);
+
+static const struct pci_error_handlers qaic_pci_err_handler = {
+	.error_detected = qaic_pci_error_detected,
+	.reset_prepare = qaic_pci_reset_prepare,
+	.reset_done = qaic_pci_reset_done,
+};
+
+static bool qaic_is_under_reset(struct qaic_device *qdev)
+{
+	int rcu_id;
+	bool ret;
+
+	rcu_id = srcu_read_lock(&qdev->dev_lock);
+	ret = qdev->dev_state != QAIC_ONLINE;
+	srcu_read_unlock(&qdev->dev_lock, rcu_id);
+	return ret;
+}
+
+static bool qaic_data_path_busy(struct qaic_device *qdev)
+{
+	bool ret = false;
+	int dev_rcu_id;
+	int i;
+
+	dev_rcu_id = srcu_read_lock(&qdev->dev_lock);
+	if (qdev->dev_state != QAIC_ONLINE) {
+		srcu_read_unlock(&qdev->dev_lock, dev_rcu_id);
+		return false;
+	}
+	for (i = 0; i < qdev->num_dbc; i++) {
+		struct dma_bridge_chan *dbc = &qdev->dbc[i];
+		unsigned long flags;
+		int ch_rcu_id;
+
+		ch_rcu_id = srcu_read_lock(&dbc->ch_lock);
+		if (!dbc->usr || !dbc->in_use) {
+			srcu_read_unlock(&dbc->ch_lock, ch_rcu_id);
+			continue;
+		}
+		spin_lock_irqsave(&dbc->xfer_lock, flags);
+		ret = !list_empty(&dbc->xfer_list);
+		spin_unlock_irqrestore(&dbc->xfer_lock, flags);
+		srcu_read_unlock(&dbc->ch_lock, ch_rcu_id);
+		if (ret)
+			break;
+	}
+	srcu_read_unlock(&qdev->dev_lock, dev_rcu_id);
+	return ret;
+}
+
+static int qaic_pm_suspend(struct device *dev)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(dev));
+
+	dev_dbg(dev, "Suspending..\n");
+	if (qaic_data_path_busy(qdev)) {
+		dev_dbg(dev, "Device's datapath is busy. Aborting suspend..\n");
+		return -EBUSY;
+	}
+	if (qaic_is_under_reset(qdev)) {
+		dev_dbg(dev, "Device is under reset. Aborting suspend..\n");
+		return -EBUSY;
+	}
+	qaic_mqts_ch_stop_timer(qdev->mqts_ch);
+	qaic_pci_reset_prepare(qdev->pdev);
+	pci_save_state(qdev->pdev);
+	pci_disable_device(qdev->pdev);
+	pci_set_power_state(qdev->pdev, PCI_D3hot);
+	return 0;
+}
+
+static int qaic_pm_resume(struct device *dev)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(dev));
+	int ret;
+
+	dev_dbg(dev, "Resuming..\n");
+	pci_set_power_state(qdev->pdev, PCI_D0);
+	pci_restore_state(qdev->pdev);
+	ret = pci_enable_device(qdev->pdev);
+	if (ret) {
+		dev_err(dev, "pci_enable_device failed on resume %d\n", ret);
+		return ret;
+	}
+	pci_set_master(qdev->pdev);
+	qaic_pci_reset_done(qdev->pdev);
+	return 0;
+}
+
+static const struct dev_pm_ops qaic_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(qaic_pm_suspend, qaic_pm_resume)
+};
+
+static struct pci_driver qaic_pci_driver = {
+	.name = QAIC_NAME,
+	.id_table = qaic_ids,
+	.probe = qaic_pci_probe,
+	.remove = qaic_pci_remove,
+	.shutdown = qaic_pci_shutdown,
+	.err_handler = &qaic_pci_err_handler,
+	.driver = {
+		.pm = pm_sleep_ptr(&qaic_pm_ops),
+	},
+};
+
+static int __init qaic_init(void)
+{
+	int ret;
+
+	ret = pci_register_driver(&qaic_pci_driver);
+	if (ret) {
+		pr_debug("qaic: pci_register_driver failed %d\n", ret);
+		return ret;
+	}
+
+	ret = mhi_driver_register(&qaic_mhi_driver);
+	if (ret) {
+		pr_debug("qaic: mhi_driver_register failed %d\n", ret);
+		goto free_pci;
+	}
+
+	ret = sahara_register();
+	if (ret) {
+		pr_debug("qaic: sahara_register failed %d\n", ret);
+		goto free_mhi;
+	}
+
+	ret = qaic_timesync_init();
+	if (ret)
+		pr_debug("qaic: qaic_timesync_init failed %d\n", ret);
+
+	ret = qaic_bootlog_register();
+	if (ret)
+		pr_debug("qaic: qaic_bootlog_register failed %d\n", ret);
+
+	ret = qaic_ras_register();
+	if (ret)
+		pr_debug("qaic: qaic_ras_register failed %d\n", ret);
+	ret = qaic_ssr_register();
+	if (ret) {
+		pr_debug("qaic: qaic_ssr_register failed %d\n", ret);
+		goto free_bootlog;
+	}
+
+	return 0;
+
+free_bootlog:
+	qaic_bootlog_unregister();
+free_mhi:
+	mhi_driver_unregister(&qaic_mhi_driver);
+free_pci:
+	pci_unregister_driver(&qaic_pci_driver);
+	return ret;
+}
+
+static void __exit qaic_exit(void)
+{
+	/*
+	 * We assume that qaic_pci_remove() is called due to a hotplug event
+	 * which would mean that the link is down, and thus
+	 * qaic_mhi_free_controller() should not try to access the device during
+	 * cleanup.
+	 * We call pci_unregister_driver() below, which also triggers
+	 * qaic_pci_remove(), but since this is module exit, we expect the link
+	 * to the device to be up, in which case qaic_mhi_free_controller()
+	 * should try to access the device during cleanup to put the device in
+	 * a sane state.
+	 * For that reason, we set link_up here to let qaic_mhi_free_controller
+	 * know the expected link state. Since the module is going to be
+	 * removed at the end of this, we don't need to worry about
+	 * reinitializing the link_up state after the cleanup is done.
+	 */
+	link_up = true;
+	qaic_ssr_unregister();
+	qaic_ras_unregister();
+	qaic_bootlog_unregister();
+	qaic_timesync_deinit();
+	sahara_unregister();
+	mhi_driver_unregister(&qaic_mhi_driver);
+	pci_unregister_driver(&qaic_pci_driver);
+}
+
+module_init(qaic_init);
+module_exit(qaic_exit);
+
+MODULE_AUTHOR(QAIC_DESC " Kernel Driver Team");
+MODULE_DESCRIPTION(QAIC_DESC " Accel Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/accel/qaic/qaic_ras.c b/drivers/accel/qaic/qaic_ras.c
new file mode 100644
index 000000000..cc0b75461
--- /dev/null
+++ b/drivers/accel/qaic/qaic_ras.c
@@ -0,0 +1,642 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved. */
+/* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. */
+
+#include <asm/byteorder.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mhi.h>
+
+#include "qaic.h"
+#include "qaic_ras.h"
+
+#define MAGIC		0x55AA
+#define VERSION		0x2
+#define HDR_SZ		12
+#define NUM_TEMP_LVL	3
+#define POWER_BREAK	BIT(0)
+
+enum msg_type {
+	MSG_PUSH, /* async push from device */
+	MSG_REQ,  /* sync request to device */
+	MSG_RESP, /* sync response from device */
+};
+
+enum err_type {
+	CE,	/* correctable error */
+	UE,	/* uncorrectable error */
+	UE_NF,	/* uncorrectable error that is non-fatal, expect a disruption */
+	ERR_TYPE_MAX,
+};
+
+static const char * const err_type_str[] = {
+	[CE]    = "Correctable",
+	[UE]    = "Uncorrectable",
+	[UE_NF] = "Uncorrectable Non-Fatal",
+};
+
+static const char * const err_class_str[] = {
+	[CE]    = "Warning",
+	[UE]    = "Fatal",
+	[UE_NF] = "Warning",
+};
+
+enum err_source {
+	SOC_MEM,
+	PCIE,
+	DDR,
+	SYS_BUS1,
+	SYS_BUS2,
+	NSP_MEM,
+	TSENS,
+};
+
+static const char * const err_src_str[TSENS + 1] = {
+	[SOC_MEM]	= "SoC Memory",
+	[PCIE]		= "PCIE",
+	[DDR]		= "DDR",
+	[SYS_BUS1]	= "System Bus source 1",
+	[SYS_BUS2]	= "System Bus source 2",
+	[NSP_MEM]	= "NSP Memory",
+	[TSENS]		= "Temperature Sensors",
+};
+
+struct ras_data {
+	/* header start */
+	/* Magic number to validate the message */
+	u16 magic;
+	/* RAS version number */
+	u16 ver;
+	u32 seq_num;
+	/* RAS message type */
+	u8  type;
+	u8  id;
+	/* Size of RAS message without the header in byte */
+	u16 len;
+	/* header end */
+	s32 result;
+	/*
+	 * Error source
+	 * 0 : SoC Memory
+	 * 1 : PCIE
+	 * 2 : DDR
+	 * 3 : System Bus source 1
+	 * 4 : System Bus source 2
+	 * 5 : NSP Memory
+	 * 6 : Temperature Sensors
+	 */
+	u32 source;
+	/*
+	 * Stores the error type, there are three types of error in RAS
+	 * 0 : correctable error (CE)
+	 * 1 : uncorrectable error (UE)
+	 * 2 : uncorrectable error that is non-fatal (UE_NF)
+	 */
+	u32 err_type;
+	u32 err_threshold;
+	u32 ce_count;
+	u32 ue_count;
+	u32 intr_num;
+	/* Data specific to error source */
+	u8  syndrome[64];
+} __packed;
+
+struct soc_mem_syndrome {
+	u64 error_address[8];
+} __packed;
+
+struct nsp_mem_syndrome {
+	u32 error_address[8];
+	u8 nsp_id;
+} __packed;
+
+struct ddr_syndrome {
+	u32 count;
+	u32 irq_status;
+	u32 data_31_0[2];
+	u32 data_63_32[2];
+	u32 data_95_64[2];
+	u32 data_127_96[2];
+	u32 addr_lsb;
+	u16 addr_msb;
+	u16 parity_bits;
+	u16 instance;
+	u16 err_type;
+} __packed;
+
+struct tsens_syndrome {
+	u32 threshold_type;
+	s32 temp;
+} __packed;
+
+struct sysbus1_syndrome {
+	u32 slave;
+	u32 err_type;
+	u16 addr[8];
+	u8  instance;
+} __packed;
+
+struct sysbus2_syndrome {
+	u32 lsb3;
+	u32 msb3;
+	u32 lsb2;
+	u32 msb2;
+	u32 ext_id;
+	u16 path;
+	u16 op_type;
+	u16 len;
+	u16 redirect;
+	u8  valid;
+	u8  word_error;
+	u8  non_secure;
+	u8  opc;
+	u8  error_code;
+	u8  trans_type;
+	u8  addr_space;
+	u8  instance;
+} __packed;
+
+struct pcie_syndrome {
+	/* CE info */
+	u32 bad_tlp;
+	u32 bad_dllp;
+	u32 replay_rollover;
+	u32 replay_timeout;
+	u32 rx_err;
+	u32 internal_ce_count;
+	/* UE_NF info */
+	u32 fc_timeout;
+	u32 poison_tlp;
+	u32 ecrc_err;
+	u32 unsupported_req;
+	u32 completer_abort;
+	u32 completion_timeout;
+	/* UE info */
+	u32 addr;
+	u8  index;
+	/*
+	 * Flag to indicate specific event of PCIe
+	 * BIT(0): Power break (low power)
+	 * BIT(1) to BIT(7): Reserved
+	 */
+	u8 flag;
+} __packed;
+
+static const char * const threshold_type_str[NUM_TEMP_LVL] = {
+	[0] = "lower",
+	[1] = "upper",
+	[2] = "critical",
+};
+
+static void ras_msg_to_cpu(struct ras_data *msg)
+{
+	struct sysbus1_syndrome *sysbus1_syndrome = (struct sysbus1_syndrome *)&msg->syndrome[0];
+	struct sysbus2_syndrome *sysbus2_syndrome = (struct sysbus2_syndrome *)&msg->syndrome[0];
+	struct soc_mem_syndrome *soc_syndrome = (struct soc_mem_syndrome *)&msg->syndrome[0];
+	struct nsp_mem_syndrome *nsp_syndrome = (struct nsp_mem_syndrome *)&msg->syndrome[0];
+	struct tsens_syndrome *tsens_syndrome = (struct tsens_syndrome *)&msg->syndrome[0];
+	struct pcie_syndrome *pcie_syndrome = (struct pcie_syndrome *)&msg->syndrome[0];
+	struct ddr_syndrome *ddr_syndrome = (struct ddr_syndrome *)&msg->syndrome[0];
+	int i;
+
+	le16_to_cpus(&msg->magic);
+	le16_to_cpus(&msg->ver);
+	le32_to_cpus(&msg->seq_num);
+	le16_to_cpus(&msg->len);
+	le32_to_cpus(&msg->result);
+	le32_to_cpus(&msg->source);
+	le32_to_cpus(&msg->err_type);
+	le32_to_cpus(&msg->err_threshold);
+	le32_to_cpus(&msg->ce_count);
+	le32_to_cpus(&msg->ue_count);
+	le32_to_cpus(&msg->intr_num);
+
+	switch (msg->source) {
+	case SOC_MEM:
+		for (i = 0; i < 8; i++)
+			le64_to_cpus(&soc_syndrome->error_address[i]);
+		break;
+	case PCIE:
+		le32_to_cpus(&pcie_syndrome->bad_tlp);
+		le32_to_cpus(&pcie_syndrome->bad_dllp);
+		le32_to_cpus(&pcie_syndrome->replay_rollover);
+		le32_to_cpus(&pcie_syndrome->replay_timeout);
+		le32_to_cpus(&pcie_syndrome->rx_err);
+		le32_to_cpus(&pcie_syndrome->internal_ce_count);
+		le32_to_cpus(&pcie_syndrome->fc_timeout);
+		le32_to_cpus(&pcie_syndrome->poison_tlp);
+		le32_to_cpus(&pcie_syndrome->ecrc_err);
+		le32_to_cpus(&pcie_syndrome->unsupported_req);
+		le32_to_cpus(&pcie_syndrome->completer_abort);
+		le32_to_cpus(&pcie_syndrome->completion_timeout);
+		le32_to_cpus(&pcie_syndrome->addr);
+		break;
+	case DDR:
+		le16_to_cpus(&ddr_syndrome->instance);
+		le16_to_cpus(&ddr_syndrome->err_type);
+		le32_to_cpus(&ddr_syndrome->count);
+		le32_to_cpus(&ddr_syndrome->irq_status);
+		le32_to_cpus(&ddr_syndrome->data_31_0[0]);
+		le32_to_cpus(&ddr_syndrome->data_31_0[1]);
+		le32_to_cpus(&ddr_syndrome->data_63_32[0]);
+		le32_to_cpus(&ddr_syndrome->data_63_32[1]);
+		le32_to_cpus(&ddr_syndrome->data_95_64[0]);
+		le32_to_cpus(&ddr_syndrome->data_95_64[1]);
+		le32_to_cpus(&ddr_syndrome->data_127_96[0]);
+		le32_to_cpus(&ddr_syndrome->data_127_96[1]);
+		le16_to_cpus(&ddr_syndrome->parity_bits);
+		le16_to_cpus(&ddr_syndrome->addr_msb);
+		le32_to_cpus(&ddr_syndrome->addr_lsb);
+		break;
+	case SYS_BUS1:
+		le32_to_cpus(&sysbus1_syndrome->slave);
+		le32_to_cpus(&sysbus1_syndrome->err_type);
+		for (i = 0; i < 8; i++)
+			le16_to_cpus(&sysbus1_syndrome->addr[i]);
+		break;
+	case SYS_BUS2:
+		le16_to_cpus(&sysbus2_syndrome->op_type);
+		le16_to_cpus(&sysbus2_syndrome->len);
+		le16_to_cpus(&sysbus2_syndrome->redirect);
+		le16_to_cpus(&sysbus2_syndrome->path);
+		le32_to_cpus(&sysbus2_syndrome->ext_id);
+		le32_to_cpus(&sysbus2_syndrome->lsb2);
+		le32_to_cpus(&sysbus2_syndrome->msb2);
+		le32_to_cpus(&sysbus2_syndrome->lsb3);
+		le32_to_cpus(&sysbus2_syndrome->msb3);
+		break;
+	case NSP_MEM:
+		for (i = 0; i < 8; i++)
+			le32_to_cpus(&nsp_syndrome->error_address[i]);
+		break;
+	case TSENS:
+		le32_to_cpus(&tsens_syndrome->threshold_type);
+		le32_to_cpus(&tsens_syndrome->temp);
+		break;
+	}
+}
+
+static void decode_ras_msg(struct qaic_device *qdev, struct ras_data *msg)
+{
+	struct sysbus1_syndrome *sysbus1_syndrome = (struct sysbus1_syndrome *)&msg->syndrome[0];
+	struct sysbus2_syndrome *sysbus2_syndrome = (struct sysbus2_syndrome *)&msg->syndrome[0];
+	struct soc_mem_syndrome *soc_syndrome = (struct soc_mem_syndrome *)&msg->syndrome[0];
+	struct nsp_mem_syndrome *nsp_syndrome = (struct nsp_mem_syndrome *)&msg->syndrome[0];
+	struct tsens_syndrome *tsens_syndrome = (struct tsens_syndrome *)&msg->syndrome[0];
+	struct pcie_syndrome *pcie_syndrome = (struct pcie_syndrome *)&msg->syndrome[0];
+	struct ddr_syndrome *ddr_syndrome = (struct ddr_syndrome *)&msg->syndrome[0];
+	char *class;
+	char *level;
+
+	if (msg->magic != MAGIC) {
+		pci_warn(qdev->pdev, "Dropping RAS message with invalid magic %x\n", msg->magic);
+		return;
+	}
+
+	if (!msg->ver || msg->ver > VERSION) {
+		pci_warn(qdev->pdev, "Dropping RAS message with invalid version %d\n", msg->ver);
+		return;
+	}
+
+	if (msg->type != MSG_PUSH) {
+		pci_warn(qdev->pdev, "Dropping non-PUSH RAS message\n");
+		return;
+	}
+
+	if (msg->len != sizeof(*msg) - HDR_SZ) {
+		pci_warn(qdev->pdev, "Dropping RAS message with invalid len %d\n", msg->len);
+		return;
+	}
+
+	if (msg->err_type >= ERR_TYPE_MAX) {
+		pci_warn(qdev->pdev, "Dropping RAS message with err type %d\n", msg->err_type);
+		return;
+	}
+
+	if (msg->err_type == UE)
+		level = KERN_ERR;
+	else
+		level = KERN_WARNING;
+
+	switch (msg->source) {
+	case SOC_MEM:
+		dev_printk(level, &qdev->pdev->dev, "RAS event.\nClass:%s\nDescription:%s %s %s\nError Threshold for this report %d\nSyndrome:\n    0x%llx\n    0x%llx\n    0x%llx\n    0x%llx\n    0x%llx\n    0x%llx\n    0x%llx\n    0x%llx\n",
+			   err_class_str[msg->err_type],
+			   err_type_str[msg->err_type],
+			   "error from",
+			   err_src_str[msg->source],
+			   msg->err_threshold,
+			   soc_syndrome->error_address[0],
+			   soc_syndrome->error_address[1],
+			   soc_syndrome->error_address[2],
+			   soc_syndrome->error_address[3],
+			   soc_syndrome->error_address[4],
+			   soc_syndrome->error_address[5],
+			   soc_syndrome->error_address[6],
+			   soc_syndrome->error_address[7]);
+		break;
+	case PCIE:
+		dev_printk(level, &qdev->pdev->dev, "RAS event.\nClass:%s\nDescription:%s %s %s\nError Threshold for this report %d\n",
+			   err_class_str[msg->err_type],
+			   err_type_str[msg->err_type],
+			   "error from",
+			   err_src_str[msg->source],
+			   msg->err_threshold);
+
+		switch (msg->err_type) {
+		case CE:
+			/*
+			 * Modeled after AER prints. This continues the dev_printk() from a few
+			 * lines up. We reduce duplication of code, but also avoid re-printing the
+			 * PCI device info so that the end result looks uniform to the log user.
+			 */
+			printk(KERN_WARNING pr_fmt("Syndrome:\n    Bad TLP count %d\n    Bad DLLP count %d\n    Replay Rollover count %d\n    Replay Timeout count %d\n    Recv Error count %d\n    Internal CE count %d\n"),
+			       pcie_syndrome->bad_tlp,
+			       pcie_syndrome->bad_dllp,
+			       pcie_syndrome->replay_rollover,
+			       pcie_syndrome->replay_timeout,
+			       pcie_syndrome->rx_err,
+			       pcie_syndrome->internal_ce_count);
+			if (msg->ver > 0x1)
+				pr_warn("    Power break %s\n",
+					pcie_syndrome->flag & POWER_BREAK ? "ON" : "OFF");
+			break;
+		case UE:
+			printk(KERN_ERR pr_fmt("Syndrome:\n    Index %d\n    Address 0x%x\n"),
+			       pcie_syndrome->index, pcie_syndrome->addr);
+			break;
+		case UE_NF:
+			printk(KERN_WARNING pr_fmt("Syndrome:\n    FC timeout count %d\n    Poisoned TLP count %d\n    ECRC error count %d\n    Unsupported request count %d\n    Completer abort count %d\n    Completion timeout count %d\n"),
+			       pcie_syndrome->fc_timeout,
+			       pcie_syndrome->poison_tlp,
+			       pcie_syndrome->ecrc_err,
+			       pcie_syndrome->unsupported_req,
+			       pcie_syndrome->completer_abort,
+			       pcie_syndrome->completion_timeout);
+			break;
+		default:
+			break;
+		}
+		break;
+	case DDR:
+		dev_printk(level, &qdev->pdev->dev, "RAS event.\nClass:%s\nDescription:%s %s %s\nError Threshold for this report %d\nSyndrome:\n    Instance %d\n    Count %d\n    Data 31_0 0x%x 0x%x\n    Data 63_32 0x%x 0x%x\n    Data 95_64 0x%x 0x%x\n    Data 127_96 0x%x 0x%x\n    Parity bits 0x%x\n    Address msb 0x%x\n    Address lsb 0x%x\n",
+			   err_class_str[msg->err_type],
+			   err_type_str[msg->err_type],
+			   "error from",
+			   err_src_str[msg->source],
+			   msg->err_threshold,
+			   ddr_syndrome->instance,
+			   ddr_syndrome->count,
+			   ddr_syndrome->data_31_0[1],
+			   ddr_syndrome->data_31_0[0],
+			   ddr_syndrome->data_63_32[1],
+			   ddr_syndrome->data_63_32[0],
+			   ddr_syndrome->data_95_64[1],
+			   ddr_syndrome->data_95_64[0],
+			   ddr_syndrome->data_127_96[1],
+			   ddr_syndrome->data_127_96[0],
+			   ddr_syndrome->parity_bits,
+			   ddr_syndrome->addr_msb,
+			   ddr_syndrome->addr_lsb);
+		break;
+	case SYS_BUS1:
+		dev_printk(level, &qdev->pdev->dev, "RAS event.\nClass:%s\nDescription:%s %s %s\nError Threshold for this report %d\nSyndrome:\n    instance %d\n    %s\n    err_type %d\n    address0 0x%x\n    address1 0x%x\n    address2 0x%x\n    address3 0x%x\n    address4 0x%x\n    address5 0x%x\n    address6 0x%x\n    address7 0x%x\n",
+			   err_class_str[msg->err_type],
+			   err_type_str[msg->err_type],
+			   "error from",
+			   err_src_str[msg->source],
+			   msg->err_threshold,
+			   sysbus1_syndrome->instance,
+			   sysbus1_syndrome->slave ? "Slave" : "Master",
+			   sysbus1_syndrome->err_type,
+			   sysbus1_syndrome->addr[0],
+			   sysbus1_syndrome->addr[1],
+			   sysbus1_syndrome->addr[2],
+			   sysbus1_syndrome->addr[3],
+			   sysbus1_syndrome->addr[4],
+			   sysbus1_syndrome->addr[5],
+			   sysbus1_syndrome->addr[6],
+			   sysbus1_syndrome->addr[7]);
+		break;
+	case SYS_BUS2:
+		dev_printk(level, &qdev->pdev->dev, "RAS event.\nClass:%s\nDescription:%s %s %s\nError Threshold for this report %d\nSyndrome:\n    instance %d\n    valid %d\n    word error %d\n    non-secure %d\n    opc %d\n    error code %d\n    transaction type %d\n    address space %d\n    operation type %d\n    len %d\n    redirect %d\n    path %d\n    ext_id %d\n    lsb2 %d\n    msb2 %d\n    lsb3 %d\n    msb3 %d\n",
+			   err_class_str[msg->err_type],
+			   err_type_str[msg->err_type],
+			   "error from",
+			   err_src_str[msg->source],
+			   msg->err_threshold,
+			   sysbus2_syndrome->instance,
+			   sysbus2_syndrome->valid,
+			   sysbus2_syndrome->word_error,
+			   sysbus2_syndrome->non_secure,
+			   sysbus2_syndrome->opc,
+			   sysbus2_syndrome->error_code,
+			   sysbus2_syndrome->trans_type,
+			   sysbus2_syndrome->addr_space,
+			   sysbus2_syndrome->op_type,
+			   sysbus2_syndrome->len,
+			   sysbus2_syndrome->redirect,
+			   sysbus2_syndrome->path,
+			   sysbus2_syndrome->ext_id,
+			   sysbus2_syndrome->lsb2,
+			   sysbus2_syndrome->msb2,
+			   sysbus2_syndrome->lsb3,
+			   sysbus2_syndrome->msb3);
+		break;
+	case NSP_MEM:
+		dev_printk(level, &qdev->pdev->dev, "RAS event.\nClass:%s\nDescription:%s %s %s\nError Threshold for this report %d\nSyndrome:\n    NSP ID %d\n    0x%x\n    0x%x\n    0x%x\n    0x%x\n    0x%x\n    0x%x\n    0x%x\n    0x%x\n",
+			   err_class_str[msg->err_type],
+			   err_type_str[msg->err_type],
+			   "error from",
+			   err_src_str[msg->source],
+			   msg->err_threshold,
+			   nsp_syndrome->nsp_id,
+			   nsp_syndrome->error_address[0],
+			   nsp_syndrome->error_address[1],
+			   nsp_syndrome->error_address[2],
+			   nsp_syndrome->error_address[3],
+			   nsp_syndrome->error_address[4],
+			   nsp_syndrome->error_address[5],
+			   nsp_syndrome->error_address[6],
+			   nsp_syndrome->error_address[7]);
+		break;
+	case TSENS:
+		if (tsens_syndrome->threshold_type >= NUM_TEMP_LVL) {
+			pci_warn(qdev->pdev, "Dropping RAS message with invalid temp threshold %d\n",
+				 tsens_syndrome->threshold_type);
+			break;
+		}
+
+		if (msg->err_type)
+			class = "Fatal";
+		else if (tsens_syndrome->threshold_type)
+			class = "Critical";
+		else
+			class = "Warning";
+
+		dev_printk(level, &qdev->pdev->dev, "RAS event.\nClass:%s\nDescription:%s %s %s\nError Threshold for this report %d\nSyndrome:\n    %s threshold\n    %d deg C\n",
+			   class,
+			   err_type_str[msg->err_type],
+			   "error from",
+			   err_src_str[msg->source],
+			   msg->err_threshold,
+			   threshold_type_str[tsens_syndrome->threshold_type],
+			   tsens_syndrome->temp);
+		break;
+	}
+
+	/* Uncorrectable errors are fatal */
+	if (msg->err_type == UE)
+		mhi_soc_reset(qdev->mhi_cntrl);
+
+	switch (msg->err_type) {
+	case CE:
+		if (qdev->ce_count != UINT_MAX)
+			qdev->ce_count++;
+		break;
+	case UE:
+		if (qdev->ce_count != UINT_MAX)
+			qdev->ue_count++;
+		break;
+	case UE_NF:
+		if (qdev->ce_count != UINT_MAX)
+			qdev->ue_nf_count++;
+		break;
+	default:
+		/* not possible */
+		break;
+	}
+}
+
+static ssize_t ce_count_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(dev));
+
+	return sysfs_emit(buf, "%d\n", qdev->ce_count);
+}
+
+static ssize_t ue_count_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(dev));
+
+	return sysfs_emit(buf, "%d\n", qdev->ue_count);
+}
+
+static ssize_t ue_nonfatal_count_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(dev));
+
+	return sysfs_emit(buf, "%d\n", qdev->ue_nf_count);
+}
+
+static DEVICE_ATTR_RO(ce_count);
+static DEVICE_ATTR_RO(ue_count);
+static DEVICE_ATTR_RO(ue_nonfatal_count);
+
+static struct attribute *ras_attrs[] = {
+	&dev_attr_ce_count.attr,
+	&dev_attr_ue_count.attr,
+	&dev_attr_ue_nonfatal_count.attr,
+	NULL,
+};
+
+static struct attribute_group ras_group = {
+	.attrs = ras_attrs,
+};
+
+static int qaic_ras_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+	struct ras_data *resp;
+	int ret;
+
+	ret = mhi_prepare_for_transfer(mhi_dev);
+	if (ret)
+		return ret;
+
+	resp = kzalloc_obj(*resp);
+	if (!resp) {
+		mhi_unprepare_from_transfer(mhi_dev);
+		return -ENOMEM;
+	}
+
+	ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, resp, sizeof(*resp), MHI_EOT);
+	if (ret) {
+		kfree(resp);
+		mhi_unprepare_from_transfer(mhi_dev);
+		return ret;
+	}
+
+	ret = device_add_group(&qdev->pdev->dev, &ras_group);
+	if (ret) {
+		mhi_unprepare_from_transfer(mhi_dev);
+		pci_dbg(qdev->pdev, "ras add sysfs failed %d\n", ret);
+		return ret;
+	}
+
+	dev_set_drvdata(&mhi_dev->dev, qdev);
+	qdev->ras_ch = mhi_dev;
+
+	return ret;
+}
+
+static void qaic_ras_mhi_remove(struct mhi_device *mhi_dev)
+{
+	struct qaic_device *qdev;
+
+	qdev = dev_get_drvdata(&mhi_dev->dev);
+	qdev->ras_ch = NULL;
+	device_remove_group(&qdev->pdev->dev, &ras_group);
+	mhi_unprepare_from_transfer(mhi_dev);
+}
+
+static void qaic_ras_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result) {}
+
+static void qaic_ras_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct qaic_device *qdev = dev_get_drvdata(&mhi_dev->dev);
+	struct ras_data *msg = mhi_result->buf_addr;
+	int ret;
+
+	if (mhi_result->transaction_status) {
+		kfree(msg);
+		return;
+	}
+
+	ras_msg_to_cpu(msg);
+	decode_ras_msg(qdev, msg);
+
+	ret = mhi_queue_buf(qdev->ras_ch, DMA_FROM_DEVICE, msg, sizeof(*msg), MHI_EOT);
+	if (ret) {
+		dev_err(&mhi_dev->dev, "Cannot requeue RAS recv buf %d\n", ret);
+		kfree(msg);
+	}
+}
+
+static const struct mhi_device_id qaic_ras_mhi_match_table[] = {
+	{ .chan = "QAIC_STATUS", },
+	{},
+};
+
+static struct mhi_driver qaic_ras_mhi_driver = {
+	.id_table = qaic_ras_mhi_match_table,
+	.remove = qaic_ras_mhi_remove,
+	.probe = qaic_ras_mhi_probe,
+	.ul_xfer_cb = qaic_ras_mhi_ul_xfer_cb,
+	.dl_xfer_cb = qaic_ras_mhi_dl_xfer_cb,
+	.driver = {
+		.name = "qaic_ras",
+	},
+};
+
+int qaic_ras_register(void)
+{
+	return mhi_driver_register(&qaic_ras_mhi_driver);
+}
+
+void qaic_ras_unregister(void)
+{
+	mhi_driver_unregister(&qaic_ras_mhi_driver);
+}
diff --git a/drivers/accel/qaic/qaic_ras.h b/drivers/accel/qaic/qaic_ras.h
new file mode 100644
index 000000000..d44a4eeeb
--- /dev/null
+++ b/drivers/accel/qaic/qaic_ras.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2020, The Linux Foundation. All rights reserved. */
+
+#ifndef __QAIC_RAS_H__
+#define __QAIC_RAS_H__
+
+int qaic_ras_register(void);
+void qaic_ras_unregister(void);
+
+#endif /* __QAIC_RAS_H__ */
diff --git a/drivers/accel/qaic/qaic_ssr.c b/drivers/accel/qaic/qaic_ssr.c
new file mode 100644
index 000000000..a5bb60788
--- /dev/null
+++ b/drivers/accel/qaic/qaic_ssr.c
@@ -0,0 +1,815 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <asm/byteorder.h>
+#include <drm/drm_file.h>
+#include <drm/drm_managed.h>
+#include <linux/devcoredump.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mhi.h>
+#include <linux/workqueue.h>
+
+#include "qaic.h"
+#include "qaic_ssr.h"
+
+#define SSR_RESP_MSG_SZ 32
+#define SSR_MHI_BUF_SIZE SZ_64K
+#define SSR_MEM_READ_DATA_SIZE ((u64)SSR_MHI_BUF_SIZE - sizeof(struct ssr_crashdump))
+#define SSR_MEM_READ_CHUNK_SIZE ((u64)SSR_MEM_READ_DATA_SIZE - sizeof(struct ssr_memory_read_rsp))
+
+#define DEBUG_TRANSFER_INFO		BIT(0)
+#define DEBUG_TRANSFER_INFO_RSP		BIT(1)
+#define MEMORY_READ			BIT(2)
+#define MEMORY_READ_RSP			BIT(3)
+#define DEBUG_TRANSFER_DONE		BIT(4)
+#define DEBUG_TRANSFER_DONE_RSP		BIT(5)
+#define SSR_EVENT			BIT(8)
+#define SSR_EVENT_RSP			BIT(9)
+
+#define SSR_EVENT_NACK		BIT(0)
+#define BEFORE_SHUTDOWN		BIT(1)
+#define AFTER_SHUTDOWN		BIT(2)
+#define BEFORE_POWER_UP		BIT(3)
+#define AFTER_POWER_UP		BIT(4)
+
+struct debug_info_table {
+	/* Save preferences. Default is mandatory */
+	u64 save_perf;
+	/* Base address of the debug region */
+	u64 mem_base;
+	/* Size of debug region in bytes */
+	u64 len;
+	/* Description */
+	char desc[20];
+	/* Filename of debug region */
+	char filename[20];
+};
+
+struct _ssr_hdr {
+	__le32 cmd;
+	__le32 len;
+	__le32 dbc_id;
+};
+
+struct ssr_hdr {
+	u32 cmd;
+	u32 len;
+	u32 dbc_id;
+};
+
+struct ssr_debug_transfer_info {
+	struct ssr_hdr hdr;
+	u32 resv;
+	u64 tbl_addr;
+	u64 tbl_len;
+} __packed;
+
+struct ssr_debug_transfer_info_rsp {
+	struct _ssr_hdr hdr;
+	__le32 ret;
+} __packed;
+
+struct ssr_memory_read {
+	struct _ssr_hdr hdr;
+	__le32 resv;
+	__le64 addr;
+	__le64 len;
+} __packed;
+
+struct ssr_memory_read_rsp {
+	struct _ssr_hdr hdr;
+	__le32 resv;
+	u8 data[];
+} __packed;
+
+struct ssr_debug_transfer_done {
+	struct _ssr_hdr hdr;
+	__le32 resv;
+} __packed;
+
+struct ssr_debug_transfer_done_rsp {
+	struct _ssr_hdr hdr;
+	__le32 ret;
+} __packed;
+
+struct ssr_event {
+	struct ssr_hdr hdr;
+	u32 event;
+} __packed;
+
+struct ssr_event_rsp {
+	struct _ssr_hdr hdr;
+	__le32 event;
+} __packed;
+
+struct ssr_resp {
+	/* Work struct to schedule work coming on QAIC_SSR channel */
+	struct work_struct work;
+	/* Root struct of device, used to access device resources */
+	struct qaic_device *qdev;
+	/* Buffer used by MHI for transfer requests */
+	u8 data[] __aligned(8);
+};
+
+/* SSR crashdump book keeping structure */
+struct ssr_dump_info {
+	/* DBC associated with this SSR crashdump */
+	struct dma_bridge_chan *dbc;
+	/*
+	 * It will be used when we complete the crashdump download and switch
+	 * to waiting on SSR events
+	 */
+	struct ssr_resp *resp;
+	/* MEMORY READ request MHI buffer.*/
+	struct ssr_memory_read *read_buf_req;
+	/* TRUE: ->read_buf_req is queued for MHI transaction. FALSE: Otherwise */
+	bool read_buf_req_queued;
+	/* Address of table in host */
+	void *tbl_addr;
+	/* Total size of table */
+	u64 tbl_len;
+	/* Offset of table(->tbl_addr) where the new chunk will be dumped */
+	u64 tbl_off;
+	/* Address of table in device/target */
+	u64 tbl_addr_dev;
+	/* Ptr to the entire dump */
+	void *dump_addr;
+	/* Entire crashdump size */
+	u64 dump_sz;
+	/* Offset of crashdump(->dump_addr) where the new chunk will be dumped */
+	u64 dump_off;
+	/* Points to the table entry we are currently downloading */
+	struct debug_info_table *tbl_ent;
+	/* Offset in the current table entry(->tbl_ent) for next chuck */
+	u64 tbl_ent_off;
+};
+
+struct ssr_crashdump {
+	/*
+	 * Points to a book keeping struct maintained by MHI SSR device while
+	 * downloading a SSR crashdump. It is NULL when crashdump downloading
+	 * not in progress.
+	 */
+	struct ssr_dump_info *dump_info;
+	/* Work struct to schedule work coming on QAIC_SSR channel */
+	struct work_struct work;
+	/* Root struct of device, used to access device resources */
+	struct qaic_device *qdev;
+	/* Buffer used by MHI for transfer requests */
+	u8 data[];
+};
+
+#define QAIC_SSR_DUMP_V1_MAGIC 0x1234567890abcdef
+#define QAIC_SSR_DUMP_V1_VER   1
+struct dump_file_meta {
+	u64 magic;
+	u64 version;
+	u64 size;		/* Total size of the entire dump */
+	u64 tbl_len;		/* Length of the table in byte */
+};
+
+/*
+ * Layout of crashdump
+ *              +------------------------------------------+
+ *              |         Crashdump Meta structure         |
+ *              | type: struct dump_file_meta              |
+ *              +------------------------------------------+
+ *              |             Crashdump Table              |
+ *              | type: array of struct debug_info_table   |
+ *              |                                          |
+ *              |                                          |
+ *              |                                          |
+ *              +------------------------------------------+
+ *              |                Crashdump                 |
+ *              |                                          |
+ *              |                                          |
+ *              |                                          |
+ *              |                                          |
+ *              |                                          |
+ *              +------------------------------------------+
+ */
+
+static void free_ssr_dump_info(struct ssr_crashdump *ssr_crash)
+{
+	struct ssr_dump_info *dump_info = ssr_crash->dump_info;
+
+	ssr_crash->dump_info = NULL;
+	if (!dump_info)
+		return;
+	if (!dump_info->read_buf_req_queued)
+		kfree(dump_info->read_buf_req);
+	vfree(dump_info->tbl_addr);
+	vfree(dump_info->dump_addr);
+	kfree(dump_info);
+}
+
+void qaic_clean_up_ssr(struct qaic_device *qdev)
+{
+	struct ssr_crashdump *ssr_crash = qdev->ssr_mhi_buf;
+
+	if (!ssr_crash)
+		return;
+
+	qaic_dbc_exit_ssr(qdev);
+	free_ssr_dump_info(ssr_crash);
+}
+
+static int alloc_dump(struct ssr_dump_info *dump_info)
+{
+	struct debug_info_table *tbl_ent = dump_info->tbl_addr;
+	struct dump_file_meta *dump_meta;
+	u64 tbl_sz_lp = 0;
+	u64 dump_size = 0;
+
+	while (tbl_sz_lp < dump_info->tbl_len) {
+		le64_to_cpus(&tbl_ent->save_perf);
+		le64_to_cpus(&tbl_ent->mem_base);
+		le64_to_cpus(&tbl_ent->len);
+
+		if (tbl_ent->len == 0)
+			return -EINVAL;
+
+		dump_size += tbl_ent->len;
+		tbl_ent++;
+		tbl_sz_lp += sizeof(*tbl_ent);
+	}
+
+	dump_info->dump_sz = dump_size + dump_info->tbl_len + sizeof(*dump_meta);
+	dump_info->dump_addr = vzalloc(dump_info->dump_sz);
+	if (!dump_info->dump_addr)
+		return -ENOMEM;
+
+	/* Copy crashdump meta and table */
+	dump_meta = dump_info->dump_addr;
+	dump_meta->magic = QAIC_SSR_DUMP_V1_MAGIC;
+	dump_meta->version = QAIC_SSR_DUMP_V1_VER;
+	dump_meta->size = dump_info->dump_sz;
+	dump_meta->tbl_len = dump_info->tbl_len;
+	memcpy(dump_info->dump_addr + sizeof(*dump_meta), dump_info->tbl_addr, dump_info->tbl_len);
+	/* Offset by crashdump meta and table (copied above) */
+	dump_info->dump_off = dump_info->tbl_len + sizeof(*dump_meta);
+
+	return 0;
+}
+
+static int send_xfer_done(struct qaic_device *qdev, void *resp, u32 dbc_id)
+{
+	struct ssr_debug_transfer_done *xfer_done;
+	int ret;
+
+	xfer_done = kmalloc_obj(*xfer_done);
+	if (!xfer_done) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = mhi_queue_buf(qdev->ssr_ch, DMA_FROM_DEVICE, resp, SSR_RESP_MSG_SZ, MHI_EOT);
+	if (ret)
+		goto free_xfer_done;
+
+	xfer_done->hdr.cmd = cpu_to_le32(DEBUG_TRANSFER_DONE);
+	xfer_done->hdr.len = cpu_to_le32(sizeof(*xfer_done));
+	xfer_done->hdr.dbc_id = cpu_to_le32(dbc_id);
+
+	ret = mhi_queue_buf(qdev->ssr_ch, DMA_TO_DEVICE, xfer_done, sizeof(*xfer_done), MHI_EOT);
+	if (ret)
+		goto free_xfer_done;
+
+	return 0;
+
+free_xfer_done:
+	kfree(xfer_done);
+out:
+	return ret;
+}
+
+static int mem_read_req(struct qaic_device *qdev, u64 dest_addr, u64 dest_len)
+{
+	struct ssr_crashdump *ssr_crash = qdev->ssr_mhi_buf;
+	struct ssr_memory_read *read_buf_req;
+	struct ssr_dump_info *dump_info;
+	int ret;
+
+	dump_info = ssr_crash->dump_info;
+	ret = mhi_queue_buf(qdev->ssr_ch, DMA_FROM_DEVICE, ssr_crash->data, SSR_MEM_READ_DATA_SIZE,
+			    MHI_EOT);
+	if (ret)
+		goto out;
+
+	read_buf_req = dump_info->read_buf_req;
+	read_buf_req->hdr.cmd = cpu_to_le32(MEMORY_READ);
+	read_buf_req->hdr.len = cpu_to_le32(sizeof(*read_buf_req));
+	read_buf_req->hdr.dbc_id = cpu_to_le32(qdev->ssr_dbc);
+	read_buf_req->addr = cpu_to_le64(dest_addr);
+	read_buf_req->len = cpu_to_le64(dest_len);
+
+	ret = mhi_queue_buf(qdev->ssr_ch, DMA_TO_DEVICE, read_buf_req, sizeof(*read_buf_req),
+			    MHI_EOT);
+	if (!ret)
+		dump_info->read_buf_req_queued = true;
+
+out:
+	return ret;
+}
+
+static int ssr_copy_table(struct ssr_dump_info *dump_info, void *data, u64 len)
+{
+	if (len > dump_info->tbl_len - dump_info->tbl_off)
+		return -EINVAL;
+
+	memcpy(dump_info->tbl_addr + dump_info->tbl_off, data, len);
+	dump_info->tbl_off += len;
+
+	/* Entire table has been downloaded, alloc dump memory */
+	if (dump_info->tbl_off == dump_info->tbl_len) {
+		dump_info->tbl_ent = dump_info->tbl_addr;
+		return alloc_dump(dump_info);
+	}
+
+	return 0;
+}
+
+static int ssr_copy_dump(struct ssr_dump_info *dump_info, void *data, u64 len)
+{
+	struct debug_info_table *tbl_ent;
+
+	tbl_ent = dump_info->tbl_ent;
+
+	if (len > tbl_ent->len - dump_info->tbl_ent_off)
+		return -EINVAL;
+
+	memcpy(dump_info->dump_addr + dump_info->dump_off, data, len);
+	dump_info->dump_off += len;
+	dump_info->tbl_ent_off += len;
+
+	/*
+	 * Current segment (a entry in table) of the crashdump is complete,
+	 * move to next one
+	 */
+	if (tbl_ent->len == dump_info->tbl_ent_off) {
+		dump_info->tbl_ent++;
+		dump_info->tbl_ent_off = 0;
+	}
+
+	return 0;
+}
+
+static void ssr_dump_worker(struct work_struct *work)
+{
+	struct ssr_crashdump *ssr_crash = container_of(work, struct ssr_crashdump, work);
+	struct qaic_device *qdev = ssr_crash->qdev;
+	struct ssr_memory_read_rsp *mem_rd_resp;
+	struct debug_info_table *tbl_ent;
+	struct ssr_dump_info *dump_info;
+	u64 dest_addr, dest_len;
+	struct _ssr_hdr *_hdr;
+	struct ssr_hdr hdr;
+	u64 data_len;
+	int ret;
+
+	mem_rd_resp = (struct ssr_memory_read_rsp *)ssr_crash->data;
+	_hdr = &mem_rd_resp->hdr;
+	hdr.cmd = le32_to_cpu(_hdr->cmd);
+	hdr.len = le32_to_cpu(_hdr->len);
+	hdr.dbc_id = le32_to_cpu(_hdr->dbc_id);
+
+	if (hdr.dbc_id != qdev->ssr_dbc)
+		goto reset_device;
+
+	dump_info = ssr_crash->dump_info;
+	if (!dump_info)
+		goto reset_device;
+
+	if (hdr.cmd != MEMORY_READ_RSP)
+		goto free_dump_info;
+
+	if (hdr.len > SSR_MEM_READ_DATA_SIZE)
+		goto free_dump_info;
+
+	data_len = hdr.len - sizeof(*mem_rd_resp);
+
+	if (dump_info->tbl_off < dump_info->tbl_len) /* Chunk belongs to table */
+		ret = ssr_copy_table(dump_info, mem_rd_resp->data, data_len);
+	else /* Chunk belongs to crashdump */
+		ret = ssr_copy_dump(dump_info, mem_rd_resp->data, data_len);
+
+	if (ret)
+		goto free_dump_info;
+
+	if (dump_info->tbl_off < dump_info->tbl_len) {
+		/* Continue downloading table */
+		dest_addr = dump_info->tbl_addr_dev + dump_info->tbl_off;
+		dest_len = min(SSR_MEM_READ_CHUNK_SIZE, dump_info->tbl_len - dump_info->tbl_off);
+		ret = mem_read_req(qdev, dest_addr, dest_len);
+	} else if (dump_info->dump_off < dump_info->dump_sz) {
+		/* Continue downloading crashdump */
+		tbl_ent = dump_info->tbl_ent;
+		dest_addr = tbl_ent->mem_base + dump_info->tbl_ent_off;
+		dest_len = min(SSR_MEM_READ_CHUNK_SIZE, tbl_ent->len - dump_info->tbl_ent_off);
+		ret = mem_read_req(qdev, dest_addr, dest_len);
+	} else {
+		/* Crashdump download complete */
+		ret = send_xfer_done(qdev, dump_info->resp->data, hdr.dbc_id);
+	}
+
+	/* Most likely a MHI xfer has failed */
+	if (ret)
+		goto free_dump_info;
+
+	return;
+
+free_dump_info:
+	/* Free the allocated memory */
+	free_ssr_dump_info(ssr_crash);
+reset_device:
+	/*
+	 * After subsystem crashes in device crashdump collection begins but
+	 * something went wrong while collecting crashdump, now instead of
+	 * handling this error we just reset the device as the best effort has
+	 * been made
+	 */
+	mhi_soc_reset(qdev->mhi_cntrl);
+}
+
+static struct ssr_dump_info *alloc_dump_info(struct qaic_device *qdev,
+					     struct ssr_debug_transfer_info *debug_info)
+{
+	struct ssr_dump_info *dump_info;
+	int ret;
+
+	le64_to_cpus(&debug_info->tbl_len);
+	le64_to_cpus(&debug_info->tbl_addr);
+
+	if (debug_info->tbl_len == 0 ||
+	    debug_info->tbl_len % sizeof(struct debug_info_table) != 0) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Allocate SSR crashdump book keeping structure */
+	dump_info = kzalloc_obj(*dump_info);
+	if (!dump_info) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/* Buffer used to send MEMORY READ request to device via MHI */
+	dump_info->read_buf_req = kzalloc_obj(*dump_info->read_buf_req);
+	if (!dump_info->read_buf_req) {
+		ret = -ENOMEM;
+		goto free_dump_info;
+	}
+
+	/* Crashdump meta table buffer */
+	dump_info->tbl_addr = vzalloc(debug_info->tbl_len);
+	if (!dump_info->tbl_addr) {
+		ret = -ENOMEM;
+		goto free_read_buf_req;
+	}
+
+	dump_info->tbl_addr_dev = debug_info->tbl_addr;
+	dump_info->tbl_len = debug_info->tbl_len;
+
+	return dump_info;
+
+free_read_buf_req:
+	kfree(dump_info->read_buf_req);
+free_dump_info:
+	kfree(dump_info);
+out:
+	return ERR_PTR(ret);
+}
+
+static int dbg_xfer_info_rsp(struct qaic_device *qdev, struct dma_bridge_chan *dbc,
+			     struct ssr_debug_transfer_info *debug_info)
+{
+	struct ssr_debug_transfer_info_rsp *debug_rsp;
+	struct ssr_crashdump *ssr_crash = NULL;
+	int ret = 0, ret2;
+
+	debug_rsp = kmalloc_obj(*debug_rsp);
+	if (!debug_rsp)
+		return -ENOMEM;
+
+	if (!qdev->ssr_mhi_buf) {
+		ret = -ENOMEM;
+		goto send_rsp;
+	}
+
+	if (dbc->state != DBC_STATE_BEFORE_POWER_UP) {
+		ret = -EINVAL;
+		goto send_rsp;
+	}
+
+	ssr_crash = qdev->ssr_mhi_buf;
+	ssr_crash->dump_info = alloc_dump_info(qdev, debug_info);
+	if (IS_ERR(ssr_crash->dump_info)) {
+		ret = PTR_ERR(ssr_crash->dump_info);
+		ssr_crash->dump_info = NULL;
+	}
+
+send_rsp:
+	debug_rsp->hdr.cmd = cpu_to_le32(DEBUG_TRANSFER_INFO_RSP);
+	debug_rsp->hdr.len = cpu_to_le32(sizeof(*debug_rsp));
+	debug_rsp->hdr.dbc_id = cpu_to_le32(dbc->id);
+	/*
+	 * 0 = Return an ACK confirming the host is ready to download crashdump
+	 * 1 = Return an NACK confirming the host is not ready to download crashdump
+	 */
+	debug_rsp->ret = cpu_to_le32(ret ? 1 : 0);
+
+	ret2 = mhi_queue_buf(qdev->ssr_ch, DMA_TO_DEVICE, debug_rsp, sizeof(*debug_rsp), MHI_EOT);
+	if (ret2) {
+		free_ssr_dump_info(ssr_crash);
+		kfree(debug_rsp);
+		return ret2;
+	}
+
+	return ret;
+}
+
+static void dbg_xfer_done_rsp(struct qaic_device *qdev, struct dma_bridge_chan *dbc,
+			      struct ssr_debug_transfer_done_rsp *xfer_rsp)
+{
+	struct ssr_crashdump *ssr_crash = qdev->ssr_mhi_buf;
+	u32 status = le32_to_cpu(xfer_rsp->ret);
+	struct device *dev = &qdev->pdev->dev;
+	struct ssr_dump_info *dump_info;
+
+	dump_info = ssr_crash->dump_info;
+	if (!dump_info)
+		return;
+
+	if (status) {
+		free_ssr_dump_info(ssr_crash);
+		return;
+	}
+
+	dev_coredumpv(dev, dump_info->dump_addr, dump_info->dump_sz, GFP_KERNEL);
+	/* dev_coredumpv will free dump_info->dump_addr */
+	dump_info->dump_addr = NULL;
+	free_ssr_dump_info(ssr_crash);
+}
+
+static void ssr_worker(struct work_struct *work)
+{
+	struct ssr_resp *resp = container_of(work, struct ssr_resp, work);
+	struct ssr_hdr *hdr = (struct ssr_hdr *)resp->data;
+	struct ssr_dump_info *dump_info = NULL;
+	struct qaic_device *qdev = resp->qdev;
+	struct ssr_crashdump *ssr_crash;
+	struct ssr_event_rsp *event_rsp;
+	struct dma_bridge_chan *dbc;
+	struct ssr_event *event;
+	u32 ssr_event_ack;
+	int ret;
+
+	le32_to_cpus(&hdr->cmd);
+	le32_to_cpus(&hdr->len);
+	le32_to_cpus(&hdr->dbc_id);
+
+	if (hdr->len > SSR_RESP_MSG_SZ)
+		goto out;
+
+	if (hdr->dbc_id >= qdev->num_dbc)
+		goto out;
+
+	dbc = &qdev->dbc[hdr->dbc_id];
+
+	switch (hdr->cmd) {
+	case DEBUG_TRANSFER_INFO:
+		ret = dbg_xfer_info_rsp(qdev, dbc, (struct ssr_debug_transfer_info *)resp->data);
+		if (ret)
+			break;
+
+		ssr_crash = qdev->ssr_mhi_buf;
+		dump_info = ssr_crash->dump_info;
+		dump_info->dbc = dbc;
+		dump_info->resp = resp;
+
+		/* Start by downloading debug table */
+		ret = mem_read_req(qdev, dump_info->tbl_addr_dev,
+				   min(dump_info->tbl_len, SSR_MEM_READ_CHUNK_SIZE));
+		if (ret) {
+			free_ssr_dump_info(ssr_crash);
+			break;
+		}
+
+		/*
+		 * Till now everything went fine, which means that we will be
+		 * collecting crashdump chunk by chunk. Do not queue a response
+		 * buffer for SSR cmds till the crashdump is complete.
+		 */
+		return;
+	case SSR_EVENT:
+		event = (struct ssr_event *)hdr;
+		le32_to_cpus(&event->event);
+		ssr_event_ack = event->event;
+		ssr_crash = qdev->ssr_mhi_buf;
+
+		switch (event->event) {
+		case BEFORE_SHUTDOWN:
+			set_dbc_state(qdev, hdr->dbc_id, DBC_STATE_BEFORE_SHUTDOWN);
+			qaic_dbc_enter_ssr(qdev, hdr->dbc_id);
+			break;
+		case AFTER_SHUTDOWN:
+			set_dbc_state(qdev, hdr->dbc_id, DBC_STATE_AFTER_SHUTDOWN);
+			break;
+		case BEFORE_POWER_UP:
+			set_dbc_state(qdev, hdr->dbc_id, DBC_STATE_BEFORE_POWER_UP);
+			break;
+		case AFTER_POWER_UP:
+			/*
+			 * If dump info is a non NULL value it means that we
+			 * have received this SSR event while downloading a
+			 * crashdump for this DBC is still in progress. NACK
+			 * the SSR event
+			 */
+			if (ssr_crash && ssr_crash->dump_info) {
+				free_ssr_dump_info(ssr_crash);
+				ssr_event_ack = SSR_EVENT_NACK;
+				break;
+			}
+
+			set_dbc_state(qdev, hdr->dbc_id, DBC_STATE_AFTER_POWER_UP);
+			break;
+		default:
+			break;
+		}
+
+		event_rsp = kmalloc_obj(*event_rsp);
+		if (!event_rsp)
+			break;
+
+		event_rsp->hdr.cmd = cpu_to_le32(SSR_EVENT_RSP);
+		event_rsp->hdr.len = cpu_to_le32(sizeof(*event_rsp));
+		event_rsp->hdr.dbc_id = cpu_to_le32(hdr->dbc_id);
+		event_rsp->event = cpu_to_le32(ssr_event_ack);
+
+		ret = mhi_queue_buf(qdev->ssr_ch, DMA_TO_DEVICE, event_rsp, sizeof(*event_rsp),
+				    MHI_EOT);
+		if (ret)
+			kfree(event_rsp);
+
+		if (event->event == AFTER_POWER_UP && ssr_event_ack != SSR_EVENT_NACK) {
+			qaic_dbc_exit_ssr(qdev);
+			set_dbc_state(qdev, hdr->dbc_id, DBC_STATE_IDLE);
+		}
+
+		break;
+	case DEBUG_TRANSFER_DONE_RSP:
+		dbg_xfer_done_rsp(qdev, dbc, (struct ssr_debug_transfer_done_rsp *)hdr);
+		break;
+	default:
+		break;
+	}
+
+out:
+	ret = mhi_queue_buf(qdev->ssr_ch, DMA_FROM_DEVICE, resp->data, SSR_RESP_MSG_SZ, MHI_EOT);
+	if (ret)
+		kfree(resp);
+}
+
+static int qaic_ssr_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+	struct ssr_resp *resp;
+	int ret;
+
+	ret = mhi_prepare_for_transfer(mhi_dev);
+	if (ret)
+		return ret;
+
+	resp = kzalloc(sizeof(*resp) + SSR_RESP_MSG_SZ, GFP_KERNEL);
+	if (!resp) {
+		mhi_unprepare_from_transfer(mhi_dev);
+		return -ENOMEM;
+	}
+
+	resp->qdev = qdev;
+	INIT_WORK(&resp->work, ssr_worker);
+
+	ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, resp->data, SSR_RESP_MSG_SZ, MHI_EOT);
+	if (ret) {
+		kfree(resp);
+		mhi_unprepare_from_transfer(mhi_dev);
+		return ret;
+	}
+
+	dev_set_drvdata(&mhi_dev->dev, qdev);
+	qdev->ssr_ch = mhi_dev;
+
+	return 0;
+}
+
+static void qaic_ssr_mhi_remove(struct mhi_device *mhi_dev)
+{
+	struct qaic_device *qdev;
+
+	qdev = dev_get_drvdata(&mhi_dev->dev);
+	mhi_unprepare_from_transfer(qdev->ssr_ch);
+	qdev->ssr_ch = NULL;
+}
+
+static void qaic_ssr_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct qaic_device *qdev = dev_get_drvdata(&mhi_dev->dev);
+	struct ssr_crashdump *ssr_crash = qdev->ssr_mhi_buf;
+	struct _ssr_hdr *hdr = mhi_result->buf_addr;
+	struct ssr_dump_info *dump_info;
+
+	if (mhi_result->transaction_status) {
+		kfree(mhi_result->buf_addr);
+		return;
+	}
+
+	/*
+	 * MEMORY READ is used to download crashdump. And crashdump is
+	 * downloaded chunk by chunk in a series of MEMORY READ SSR commands.
+	 * Hence to avoid too many kmalloc() and kfree() of the same MEMORY READ
+	 * request buffer, we allocate only one such buffer and free it only
+	 * once.
+	 */
+	if (le32_to_cpu(hdr->cmd) == MEMORY_READ) {
+		dump_info = ssr_crash->dump_info;
+		if (dump_info) {
+			dump_info->read_buf_req_queued = false;
+			return;
+		}
+	}
+
+	kfree(mhi_result->buf_addr);
+}
+
+static void qaic_ssr_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct ssr_resp *resp = container_of(mhi_result->buf_addr, struct ssr_resp, data);
+	struct qaic_device *qdev = dev_get_drvdata(&mhi_dev->dev);
+	struct ssr_crashdump *ssr_crash = qdev->ssr_mhi_buf;
+	bool memory_read_rsp = false;
+
+	if (ssr_crash && ssr_crash->data == mhi_result->buf_addr)
+		memory_read_rsp = true;
+
+	if (mhi_result->transaction_status) {
+		/* Do not free SSR crashdump buffer as it allocated via managed APIs */
+		if (!memory_read_rsp)
+			kfree(resp);
+		return;
+	}
+
+	if (memory_read_rsp)
+		queue_work(qdev->ssr_wq, &ssr_crash->work);
+	else
+		queue_work(qdev->ssr_wq, &resp->work);
+}
+
+static const struct mhi_device_id qaic_ssr_mhi_match_table[] = {
+	{ .chan = "QAIC_SSR", },
+	{},
+};
+
+static struct mhi_driver qaic_ssr_mhi_driver = {
+	.id_table = qaic_ssr_mhi_match_table,
+	.remove = qaic_ssr_mhi_remove,
+	.probe = qaic_ssr_mhi_probe,
+	.ul_xfer_cb = qaic_ssr_mhi_ul_xfer_cb,
+	.dl_xfer_cb = qaic_ssr_mhi_dl_xfer_cb,
+	.driver = {
+		.name = "qaic_ssr",
+	},
+};
+
+int qaic_ssr_init(struct qaic_device *qdev, struct drm_device *drm)
+{
+	struct ssr_crashdump *ssr_crash;
+
+	qdev->ssr_dbc = QAIC_SSR_DBC_SENTINEL;
+
+	/*
+	 * Device requests only one SSR at a time. So allocating only one
+	 * buffer to download crashdump is good enough.
+	 */
+	ssr_crash = drmm_kzalloc(drm, SSR_MHI_BUF_SIZE, GFP_KERNEL);
+	if (!ssr_crash)
+		return -ENOMEM;
+
+	ssr_crash->qdev = qdev;
+	INIT_WORK(&ssr_crash->work, ssr_dump_worker);
+	qdev->ssr_mhi_buf = ssr_crash;
+
+	return 0;
+}
+
+int qaic_ssr_register(void)
+{
+	return mhi_driver_register(&qaic_ssr_mhi_driver);
+}
+
+void qaic_ssr_unregister(void)
+{
+	mhi_driver_unregister(&qaic_ssr_mhi_driver);
+}
diff --git a/drivers/accel/qaic/qaic_ssr.h b/drivers/accel/qaic/qaic_ssr.h
new file mode 100644
index 000000000..97ccff305
--- /dev/null
+++ b/drivers/accel/qaic/qaic_ssr.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021, 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __QAIC_SSR_H__
+#define __QAIC_SSR_H__
+
+struct drm_device;
+struct qaic_device;
+
+int qaic_ssr_register(void);
+void qaic_ssr_unregister(void);
+void qaic_clean_up_ssr(struct qaic_device *qdev);
+int qaic_ssr_init(struct qaic_device *qdev, struct drm_device *drm);
+#endif /* __QAIC_SSR_H__ */
diff --git a/drivers/accel/qaic/qaic_sysfs.c b/drivers/accel/qaic/qaic_sysfs.c
new file mode 100644
index 000000000..e0afb0ffb
--- /dev/null
+++ b/drivers/accel/qaic/qaic_sysfs.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2020-2025, The Linux Foundation. All rights reserved. */
+
+#include <drm/drm_file.h>
+#include <drm/drm_managed.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/kobject.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+
+#include "qaic.h"
+
+#define NAME_LEN		14
+
+struct dbc_attribute {
+	struct device_attribute dev_attr;
+	u32 dbc_id;
+	char name[NAME_LEN];
+};
+
+static ssize_t dbc_state_show(struct device *dev, struct device_attribute *a, char *buf)
+{
+	struct dbc_attribute *dbc_attr = container_of(a, struct dbc_attribute, dev_attr);
+	struct drm_minor *minor = dev_get_drvdata(dev);
+	struct qaic_device *qdev;
+
+	qdev = to_qaic_device(minor->dev);
+	return sysfs_emit(buf, "%d\n", qdev->dbc[dbc_attr->dbc_id].state);
+}
+
+void set_dbc_state(struct qaic_device *qdev, u32 dbc_id, unsigned int state)
+{
+	struct device *kdev = to_accel_kdev(qdev->qddev);
+	char *envp[3] = {};
+	char state_str[16];
+	char id_str[12];
+
+	envp[0] = id_str;
+	envp[1] = state_str;
+
+	if (state >= DBC_STATE_MAX)
+		return;
+	if (dbc_id >= qdev->num_dbc)
+		return;
+	if (state == qdev->dbc[dbc_id].state)
+		return;
+
+	scnprintf(id_str, ARRAY_SIZE(id_str), "DBC_ID=%d", dbc_id);
+	scnprintf(state_str, ARRAY_SIZE(state_str), "DBC_STATE=%d", state);
+
+	qdev->dbc[dbc_id].state = state;
+	kobject_uevent_env(&kdev->kobj, KOBJ_CHANGE, envp);
+}
+
+int qaic_sysfs_init(struct qaic_drm_device *qddev)
+{
+	struct device *kdev = to_accel_kdev(qddev);
+	struct drm_device *drm = to_drm(qddev);
+	u32 num_dbc = qddev->qdev->num_dbc;
+	struct dbc_attribute *dbc_attrs;
+	int i, ret;
+
+	dbc_attrs = drmm_kcalloc(drm, num_dbc, sizeof(*dbc_attrs), GFP_KERNEL);
+	if (!dbc_attrs)
+		return -ENOMEM;
+
+	for (i = 0; i < num_dbc; ++i) {
+		struct dbc_attribute *dbc_attr = &dbc_attrs[i];
+
+		sysfs_attr_init(&dbc_attr->dev_attr.attr);
+		dbc_attr->dbc_id = i;
+		scnprintf(dbc_attr->name, NAME_LEN, "dbc%d_state", i);
+		dbc_attr->dev_attr.attr.name = dbc_attr->name;
+		dbc_attr->dev_attr.attr.mode = 0444;
+		dbc_attr->dev_attr.show = dbc_state_show;
+		ret = sysfs_create_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
+		if (ret) {
+			int j;
+
+			for (j = 0; j < i; ++j) {
+				dbc_attr = &dbc_attrs[j];
+				sysfs_remove_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
+			}
+			drmm_kfree(drm, dbc_attrs);
+			return ret;
+		}
+	}
+
+	qddev->sysfs_attrs = dbc_attrs;
+	return 0;
+}
+
+void qaic_sysfs_remove(struct qaic_drm_device *qddev)
+{
+	struct dbc_attribute *dbc_attrs = qddev->sysfs_attrs;
+	struct device *kdev = to_accel_kdev(qddev);
+	u32 num_dbc = qddev->qdev->num_dbc;
+	int i;
+
+	if (!dbc_attrs)
+		return;
+
+	qddev->sysfs_attrs = NULL;
+	for (i = 0; i < num_dbc; ++i)
+		sysfs_remove_file(&kdev->kobj, &dbc_attrs[i].dev_attr.attr);
+	drmm_kfree(to_drm(qddev), dbc_attrs);
+}
diff --git a/drivers/accel/qaic/qaic_timesync.c b/drivers/accel/qaic/qaic_timesync.c
new file mode 100644
index 000000000..939462b99
--- /dev/null
+++ b/drivers/accel/qaic/qaic_timesync.c
@@ -0,0 +1,404 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/mhi.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/time64.h>
+#include <linux/timer.h>
+
+#include "qaic.h"
+#include "qaic_timesync.h"
+
+#define QTIMER_REG_OFFSET			0xa28
+#define QAIC_TIMESYNC_SIGNATURE			0x55aa
+#define QAIC_CONV_QTIMER_TO_US(qtimer)		(mul_u64_u32_div(qtimer, 10, 192))
+
+static unsigned int timesync_delay_ms = 1000; /* 1 sec default */
+module_param(timesync_delay_ms, uint, 0600);
+MODULE_PARM_DESC(timesync_delay_ms, "Delay in ms between two consecutive timesync operations");
+
+enum qts_msg_type {
+	QAIC_TS_CMD_TO_HOST,
+	QAIC_TS_SYNC_REQ,
+	QAIC_TS_ACK_TO_HOST,
+	QAIC_TS_MSG_TYPE_MAX
+};
+
+/**
+ * struct qts_hdr - Timesync message header structure.
+ * @signature: Unique signature to identify the timesync message.
+ * @reserved_1: Reserved for future use.
+ * @reserved_2: Reserved for future use.
+ * @msg_type: sub-type of the timesync message.
+ * @reserved_3: Reserved for future use.
+ */
+struct qts_hdr {
+	__le16	signature;
+	__le16	reserved_1;
+	u8	reserved_2;
+	u8	msg_type;
+	__le16	reserved_3;
+} __packed;
+
+/**
+ * struct qts_timeval - Structure to carry time information.
+ * @tv_sec: Seconds part of the time.
+ * @tv_usec: uS (microseconds) part of the time.
+ */
+struct qts_timeval {
+	__le64	tv_sec;
+	__le64	tv_usec;
+} __packed;
+
+/**
+ * struct qts_host_time_sync_msg_data - Structure to denote the timesync message.
+ * @header: Header of the timesync message.
+ * @data: Time information.
+ */
+struct qts_host_time_sync_msg_data {
+	struct	qts_hdr header;
+	struct	qts_timeval data;
+} __packed;
+
+/**
+ * struct mqts_dev - MHI QAIC Timesync Control device.
+ * @qdev: Pointer to the root device struct driven by QAIC driver.
+ * @mhi_dev: Pointer to associated MHI device.
+ * @timer: Timer handle used for timesync.
+ * @qtimer_addr: Device QTimer register pointer.
+ * @buff_in_use: atomic variable to track if the sync_msg buffer is in use.
+ * @dev: Device pointer to qdev->pdev->dev stored for easy access.
+ * @sync_msg: Buffer used to send timesync message over MHI.
+ */
+struct mqts_dev {
+	struct qaic_device *qdev;
+	struct mhi_device *mhi_dev;
+	struct timer_list timer;
+	void __iomem *qtimer_addr;
+	atomic_t buff_in_use;
+	struct device *dev;
+	struct qts_host_time_sync_msg_data *sync_msg;
+};
+
+struct qts_resp_msg {
+	struct qts_hdr	hdr;
+} __packed;
+
+struct qts_resp {
+	struct qts_resp_msg	data;
+	struct work_struct	work;
+	struct qaic_device	*qdev;
+};
+
+#ifdef readq
+static u64 read_qtimer(const volatile void __iomem *addr)
+{
+	return readq(addr);
+}
+#else
+static u64 read_qtimer(const volatile void __iomem *addr)
+{
+	u64 low, high;
+
+	low = readl(addr);
+	high = readl(addr + sizeof(u32));
+	return low | (high << 32);
+}
+#endif
+
+static void qaic_timesync_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
+
+	dev_dbg(mqtsdev->dev, "%s status: %d xfer_len: %zu\n", __func__,
+		mhi_result->transaction_status, mhi_result->bytes_xferd);
+
+	atomic_set(&mqtsdev->buff_in_use, 0);
+}
+
+static void qaic_timesync_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
+
+	dev_err(mqtsdev->dev, "%s no data expected on dl channel\n", __func__);
+}
+
+static void qaic_timesync_timer(struct timer_list *t)
+{
+	struct mqts_dev *mqtsdev = timer_container_of(mqtsdev, t, timer);
+	struct qts_host_time_sync_msg_data *sync_msg;
+	u64 device_qtimer_us;
+	u64 device_qtimer;
+	u64 host_time_us;
+	u64 offset_us;
+	u64 host_sec;
+	int ret;
+
+	if (atomic_read(&mqtsdev->buff_in_use)) {
+		dev_dbg(mqtsdev->dev, "%s buffer not free, schedule next cycle\n", __func__);
+		goto mod_timer;
+	}
+	atomic_set(&mqtsdev->buff_in_use, 1);
+
+	sync_msg = mqtsdev->sync_msg;
+	sync_msg->header.signature = cpu_to_le16(QAIC_TIMESYNC_SIGNATURE);
+	sync_msg->header.msg_type = QAIC_TS_SYNC_REQ;
+	/* Read host UTC time and convert to uS*/
+	host_time_us = div_u64(ktime_get_real_ns(), NSEC_PER_USEC);
+	device_qtimer = read_qtimer(mqtsdev->qtimer_addr);
+	device_qtimer_us = QAIC_CONV_QTIMER_TO_US(device_qtimer);
+	/* Offset between host UTC and device time */
+	offset_us = host_time_us - device_qtimer_us;
+
+	host_sec = div_u64(offset_us, USEC_PER_SEC);
+	sync_msg->data.tv_usec = cpu_to_le64(offset_us - host_sec * USEC_PER_SEC);
+	sync_msg->data.tv_sec = cpu_to_le64(host_sec);
+	ret = mhi_queue_buf(mqtsdev->mhi_dev, DMA_TO_DEVICE, sync_msg, sizeof(*sync_msg), MHI_EOT);
+	if (ret && (ret != -EAGAIN)) {
+		dev_err(mqtsdev->dev, "%s unable to queue to mhi:%d\n", __func__, ret);
+		return;
+	} else if (ret == -EAGAIN) {
+		atomic_set(&mqtsdev->buff_in_use, 0);
+	}
+
+mod_timer:
+	ret = mod_timer(t, jiffies + msecs_to_jiffies(timesync_delay_ms));
+	if (ret)
+		dev_err(mqtsdev->dev, "%s mod_timer error:%d\n", __func__, ret);
+}
+
+void qaic_mqts_ch_stop_timer(struct mhi_device *mhi_dev)
+{
+	struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
+
+	timer_delete_sync(&mqtsdev->timer);
+}
+
+static int qaic_timesync_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+	struct mqts_dev *mqtsdev;
+	struct timer_list *timer;
+	int ret;
+
+	mqtsdev = kzalloc_obj(*mqtsdev);
+	if (!mqtsdev) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	timer = &mqtsdev->timer;
+	mqtsdev->mhi_dev = mhi_dev;
+	mqtsdev->qdev = qdev;
+	mqtsdev->dev = &qdev->pdev->dev;
+
+	mqtsdev->sync_msg = kzalloc_obj(*mqtsdev->sync_msg);
+	if (!mqtsdev->sync_msg) {
+		ret = -ENOMEM;
+		goto free_mqts_dev;
+	}
+	atomic_set(&mqtsdev->buff_in_use, 0);
+
+	ret = mhi_prepare_for_transfer(mhi_dev);
+	if (ret)
+		goto free_sync_msg;
+
+	/* Qtimer register pointer */
+	mqtsdev->qtimer_addr = qdev->bar_mhi + QTIMER_REG_OFFSET;
+	timer_setup(timer, qaic_timesync_timer, 0);
+	timer->expires = jiffies + msecs_to_jiffies(timesync_delay_ms);
+	add_timer(timer);
+	dev_set_drvdata(&mhi_dev->dev, mqtsdev);
+	qdev->mqts_ch = mhi_dev;
+
+	return 0;
+
+free_sync_msg:
+	kfree(mqtsdev->sync_msg);
+free_mqts_dev:
+	kfree(mqtsdev);
+out:
+	return ret;
+};
+
+static void qaic_timesync_remove(struct mhi_device *mhi_dev)
+{
+	struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
+
+	mqtsdev->qdev->mqts_ch = NULL;
+	timer_delete_sync(&mqtsdev->timer);
+	mhi_unprepare_from_transfer(mqtsdev->mhi_dev);
+	kfree(mqtsdev->sync_msg);
+	kfree(mqtsdev);
+}
+
+static const struct mhi_device_id qaic_timesync_match_table[] = {
+	{ .chan = "QAIC_TIMESYNC_PERIODIC"},
+	{},
+};
+
+MODULE_DEVICE_TABLE(mhi, qaic_timesync_match_table);
+
+static struct mhi_driver qaic_timesync_driver = {
+	.id_table = qaic_timesync_match_table,
+	.remove = qaic_timesync_remove,
+	.probe = qaic_timesync_probe,
+	.ul_xfer_cb = qaic_timesync_ul_xfer_cb,
+	.dl_xfer_cb = qaic_timesync_dl_xfer_cb,
+	.driver = {
+		.name = "qaic_timesync_periodic",
+	},
+};
+
+static void qaic_boot_timesync_worker(struct work_struct *work)
+{
+	struct qts_resp *resp = container_of(work, struct qts_resp, work);
+	struct qts_host_time_sync_msg_data *req;
+	struct qts_resp_msg data = resp->data;
+	struct qaic_device *qdev = resp->qdev;
+	struct mhi_device *mhi_dev;
+	struct timespec64 ts;
+	int ret;
+
+	mhi_dev = qdev->qts_ch;
+	/* Queue the response message beforehand to avoid race conditions */
+	ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, &resp->data, sizeof(resp->data), MHI_EOT);
+	if (ret) {
+		kfree(resp);
+		dev_warn(&mhi_dev->dev, "Failed to re-queue response buffer %d\n", ret);
+		return;
+	}
+
+	switch (data.hdr.msg_type) {
+	case QAIC_TS_CMD_TO_HOST:
+		req = kzalloc_obj(*req);
+		if (!req)
+			break;
+
+		req->header = data.hdr;
+		req->header.msg_type = QAIC_TS_SYNC_REQ;
+		ktime_get_real_ts64(&ts);
+		req->data.tv_sec = cpu_to_le64(ts.tv_sec);
+		req->data.tv_usec = cpu_to_le64(div_u64(ts.tv_nsec, NSEC_PER_USEC));
+
+		ret = mhi_queue_buf(mhi_dev, DMA_TO_DEVICE, req, sizeof(*req), MHI_EOT);
+		if (ret) {
+			kfree(req);
+			dev_dbg(&mhi_dev->dev, "Failed to send request message. Error %d\n", ret);
+		}
+		break;
+	case QAIC_TS_ACK_TO_HOST:
+		dev_dbg(&mhi_dev->dev, "ACK received from device\n");
+		break;
+	default:
+		dev_err(&mhi_dev->dev, "Invalid message type %u.\n", data.hdr.msg_type);
+	}
+}
+
+static int qaic_boot_timesync_queue_resp(struct mhi_device *mhi_dev, struct qaic_device *qdev)
+{
+	struct qts_resp *resp;
+	int ret;
+
+	resp = kzalloc_obj(*resp);
+	if (!resp)
+		return -ENOMEM;
+
+	resp->qdev = qdev;
+	INIT_WORK(&resp->work, qaic_boot_timesync_worker);
+
+	ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, &resp->data, sizeof(resp->data), MHI_EOT);
+	if (ret) {
+		kfree(resp);
+		dev_warn(&mhi_dev->dev, "Failed to queue response buffer %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void qaic_boot_timesync_remove(struct mhi_device *mhi_dev)
+{
+	struct qaic_device *qdev;
+
+	qdev = dev_get_drvdata(&mhi_dev->dev);
+	mhi_unprepare_from_transfer(qdev->qts_ch);
+	qdev->qts_ch = NULL;
+}
+
+static int qaic_boot_timesync_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+	struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+	int ret;
+
+	ret = mhi_prepare_for_transfer(mhi_dev);
+	if (ret)
+		return ret;
+
+	qdev->qts_ch = mhi_dev;
+	dev_set_drvdata(&mhi_dev->dev, qdev);
+
+	ret = qaic_boot_timesync_queue_resp(mhi_dev, qdev);
+	if (ret) {
+		dev_set_drvdata(&mhi_dev->dev, NULL);
+		qdev->qts_ch = NULL;
+		mhi_unprepare_from_transfer(mhi_dev);
+	}
+
+	return ret;
+}
+
+static void qaic_boot_timesync_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	kfree(mhi_result->buf_addr);
+}
+
+static void qaic_boot_timesync_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct qts_resp *resp = container_of(mhi_result->buf_addr, struct qts_resp, data);
+
+	if (mhi_result->transaction_status || mhi_result->bytes_xferd != sizeof(resp->data)) {
+		kfree(resp);
+		return;
+	}
+
+	queue_work(resp->qdev->qts_wq, &resp->work);
+}
+
+static const struct mhi_device_id qaic_boot_timesync_match_table[] = {
+	{ .chan = "QAIC_TIMESYNC"},
+	{},
+};
+
+static struct mhi_driver qaic_boot_timesync_driver = {
+	.id_table = qaic_boot_timesync_match_table,
+	.remove = qaic_boot_timesync_remove,
+	.probe = qaic_boot_timesync_probe,
+	.ul_xfer_cb = qaic_boot_timesync_ul_xfer_cb,
+	.dl_xfer_cb = qaic_boot_timesync_dl_xfer_cb,
+	.driver = {
+		.name = "qaic_timesync",
+	},
+};
+
+int qaic_timesync_init(void)
+{
+	int ret;
+
+	ret = mhi_driver_register(&qaic_timesync_driver);
+	if (ret)
+		return ret;
+	ret = mhi_driver_register(&qaic_boot_timesync_driver);
+
+	return ret;
+}
+
+void qaic_timesync_deinit(void)
+{
+	mhi_driver_unregister(&qaic_boot_timesync_driver);
+	mhi_driver_unregister(&qaic_timesync_driver);
+}
diff --git a/drivers/accel/qaic/qaic_timesync.h b/drivers/accel/qaic/qaic_timesync.h
new file mode 100644
index 000000000..77b9c2b55
--- /dev/null
+++ b/drivers/accel/qaic/qaic_timesync.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __QAIC_TIMESYNC_H__
+#define __QAIC_TIMESYNC_H__
+
+#include <linux/mhi.h>
+
+int qaic_timesync_init(void);
+void qaic_timesync_deinit(void);
+void qaic_mqts_ch_stop_timer(struct mhi_device *mhi_dev);
+#endif /* __QAIC_TIMESYNC_H__ */
diff --git a/drivers/accel/qaic/sahara.c b/drivers/accel/qaic/sahara.c
new file mode 100644
index 000000000..fd3c3b2d1
--- /dev/null
+++ b/drivers/accel/qaic/sahara.c
@@ -0,0 +1,935 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <linux/devcoredump.h>
+#include <linux/firmware.h>
+#include <linux/limits.h>
+#include <linux/mhi.h>
+#include <linux/minmax.h>
+#include <linux/mod_devicetable.h>
+#include <linux/overflow.h>
+#include <linux/types.h>
+#include <linux/vmalloc.h>
+#include <linux/workqueue.h>
+
+#include "sahara.h"
+
+#define SAHARA_HELLO_CMD		0x1  /* Min protocol version 1.0 */
+#define SAHARA_HELLO_RESP_CMD		0x2  /* Min protocol version 1.0 */
+#define SAHARA_READ_DATA_CMD		0x3  /* Min protocol version 1.0 */
+#define SAHARA_END_OF_IMAGE_CMD		0x4  /* Min protocol version 1.0 */
+#define SAHARA_DONE_CMD			0x5  /* Min protocol version 1.0 */
+#define SAHARA_DONE_RESP_CMD		0x6  /* Min protocol version 1.0 */
+#define SAHARA_RESET_CMD		0x7  /* Min protocol version 1.0 */
+#define SAHARA_RESET_RESP_CMD		0x8  /* Min protocol version 1.0 */
+#define SAHARA_MEM_DEBUG_CMD		0x9  /* Min protocol version 2.0 */
+#define SAHARA_MEM_READ_CMD		0xa  /* Min protocol version 2.0 */
+#define SAHARA_CMD_READY_CMD		0xb  /* Min protocol version 2.1 */
+#define SAHARA_SWITCH_MODE_CMD		0xc  /* Min protocol version 2.1 */
+#define SAHARA_EXECUTE_CMD		0xd  /* Min protocol version 2.1 */
+#define SAHARA_EXECUTE_RESP_CMD		0xe  /* Min protocol version 2.1 */
+#define SAHARA_EXECUTE_DATA_CMD		0xf  /* Min protocol version 2.1 */
+#define SAHARA_MEM_DEBUG64_CMD		0x10 /* Min protocol version 2.5 */
+#define SAHARA_MEM_READ64_CMD		0x11 /* Min protocol version 2.5 */
+#define SAHARA_READ_DATA64_CMD		0x12 /* Min protocol version 2.8 */
+#define SAHARA_RESET_STATE_CMD		0x13 /* Min protocol version 2.9 */
+#define SAHARA_WRITE_DATA_CMD		0x14 /* Min protocol version 3.0 */
+
+#define SAHARA_PACKET_MAX_SIZE		0xffffU /* MHI_MAX_MTU */
+#define SAHARA_TRANSFER_MAX_SIZE	0x80000
+#define SAHARA_READ_MAX_SIZE		0xfff0U /* Avoid unaligned requests */
+#define SAHARA_NUM_TX_BUF		DIV_ROUND_UP(SAHARA_TRANSFER_MAX_SIZE,\
+							SAHARA_PACKET_MAX_SIZE)
+#define SAHARA_IMAGE_ID_NONE		U32_MAX
+
+#define SAHARA_VERSION			2
+#define SAHARA_SUCCESS			0
+#define SAHARA_TABLE_ENTRY_STR_LEN	20
+
+#define SAHARA_MODE_IMAGE_TX_PENDING	0x0
+#define SAHARA_MODE_IMAGE_TX_COMPLETE	0x1
+#define SAHARA_MODE_MEMORY_DEBUG	0x2
+#define SAHARA_MODE_COMMAND		0x3
+
+#define SAHARA_HELLO_LENGTH		0x30
+#define SAHARA_READ_DATA_LENGTH		0x14
+#define SAHARA_END_OF_IMAGE_LENGTH	0x10
+#define SAHARA_DONE_LENGTH		0x8
+#define SAHARA_RESET_LENGTH		0x8
+#define SAHARA_MEM_DEBUG64_LENGTH	0x18
+#define SAHARA_MEM_READ64_LENGTH	0x18
+
+struct sahara_packet {
+	__le32 cmd;
+	__le32 length;
+
+	union {
+		struct {
+			__le32 version;
+			__le32 version_compat;
+			__le32 max_length;
+			__le32 mode;
+		} hello;
+		struct {
+			__le32 version;
+			__le32 version_compat;
+			__le32 status;
+			__le32 mode;
+		} hello_resp;
+		struct {
+			__le32 image;
+			__le32 offset;
+			__le32 length;
+		} read_data;
+		struct {
+			__le32 image;
+			__le32 status;
+		} end_of_image;
+		struct {
+			__le64 table_address;
+			__le64 table_length;
+		} memory_debug64;
+		struct {
+			__le64 memory_address;
+			__le64 memory_length;
+		} memory_read64;
+	};
+};
+
+struct sahara_debug_table_entry64 {
+	__le64	type;
+	__le64	address;
+	__le64	length;
+	char	description[SAHARA_TABLE_ENTRY_STR_LEN];
+	char	filename[SAHARA_TABLE_ENTRY_STR_LEN];
+};
+
+struct sahara_dump_table_entry {
+	u64	type;
+	u64	address;
+	u64	length;
+	char	description[SAHARA_TABLE_ENTRY_STR_LEN];
+	char	filename[SAHARA_TABLE_ENTRY_STR_LEN];
+};
+
+#define SAHARA_DUMP_V1_MAGIC 0x1234567890abcdef
+#define SAHARA_DUMP_V1_VER   1
+struct sahara_memory_dump_meta_v1 {
+	u64	magic;
+	u64	version;
+	u64	dump_size;
+	u64	table_size;
+};
+
+/*
+ * Layout of crashdump provided to user via devcoredump
+ *              +------------------------------------------+
+ *              |         Crashdump Meta structure         |
+ *              | type: struct sahara_memory_dump_meta_v1  |
+ *              +------------------------------------------+
+ *              |             Crashdump Table              |
+ *              | type: array of struct                    |
+ *              |       sahara_dump_table_entry            |
+ *              |                                          |
+ *              |                                          |
+ *              +------------------------------------------+
+ *              |                Crashdump                 |
+ *              |                                          |
+ *              |                                          |
+ *              |                                          |
+ *              |                                          |
+ *              |                                          |
+ *              +------------------------------------------+
+ *
+ * First is the metadata header. Userspace can use the magic number to verify
+ * the content type, and then check the version for the rest of the format.
+ * New versions should keep the magic number location/value, and version
+ * location, but increment the version value.
+ *
+ * For v1, the metadata lists the size of the entire dump (header + table +
+ * dump) and the size of the table. Then the dump image table, which describes
+ * the contents of the dump. Finally all the images are listed in order, with
+ * no deadspace in between. Userspace can use the sizes listed in the image
+ * table to reconstruct the individual images.
+ */
+
+struct sahara_context {
+	struct sahara_packet		*tx[SAHARA_NUM_TX_BUF];
+	struct sahara_packet		*rx;
+	struct work_struct		fw_work;
+	struct work_struct		dump_work;
+	struct work_struct		read_data_work;
+	struct mhi_device		*mhi_dev;
+	const char * const		*image_table;
+	u32				table_size;
+	u32				active_image_id;
+	const struct firmware		*firmware;
+	u64				dump_table_address;
+	u64				dump_table_length;
+	size_t				rx_size;
+	size_t				rx_size_requested;
+	void				*mem_dump;
+	size_t				mem_dump_sz;
+	struct sahara_dump_table_entry	*dump_image;
+	u64				dump_image_offset;
+	void				*mem_dump_freespace;
+	u64				dump_images_left;
+	u32				read_data_offset;
+	u32				read_data_length;
+	bool				is_mem_dump_mode;
+	bool				non_streaming;
+};
+
+static const char * const aic100_image_table[] = {
+	[1]  = "qcom/aic100/fw1.bin",
+	[2]  = "qcom/aic100/fw2.bin",
+	[4]  = "qcom/aic100/fw4.bin",
+	[5]  = "qcom/aic100/fw5.bin",
+	[6]  = "qcom/aic100/fw6.bin",
+	[8]  = "qcom/aic100/fw8.bin",
+	[9]  = "qcom/aic100/fw9.bin",
+	[10] = "qcom/aic100/fw10.bin",
+};
+
+static const char * const aic200_image_table[] = {
+	[5]  = "qcom/aic200/uefi.elf",
+	[12] = "qcom/aic200/aic200-nsp.bin",
+	[23] = "qcom/aic200/aop.mbn",
+	[32] = "qcom/aic200/tz.mbn",
+	[33] = "qcom/aic200/hypvm.mbn",
+	[38] = "qcom/aic200/xbl_config.elf",
+	[39] = "qcom/aic200/aic200_abl.elf",
+	[40] = "qcom/aic200/apdp.mbn",
+	[41] = "qcom/aic200/devcfg.mbn",
+	[42] = "qcom/aic200/sec.elf",
+	[43] = "qcom/aic200/aic200-hlos.elf",
+	[49] = "qcom/aic200/shrm.elf",
+	[50] = "qcom/aic200/cpucp.elf",
+	[51] = "qcom/aic200/aop_devcfg.mbn",
+	[54] = "qcom/aic200/qupv3fw.elf",
+	[57] = "qcom/aic200/cpucp_dtbs.elf",
+	[62] = "qcom/aic200/uefi_dtbs.elf",
+	[63] = "qcom/aic200/xbl_ac_config.mbn",
+	[64] = "qcom/aic200/tz_ac_config.mbn",
+	[65] = "qcom/aic200/hyp_ac_config.mbn",
+	[66] = "qcom/aic200/pdp.elf",
+	[67] = "qcom/aic200/pdp_cdb.elf",
+	[68] = "qcom/aic200/sdi.mbn",
+	[69] = "qcom/aic200/dcd.mbn",
+	[73] = "qcom/aic200/gearvm.mbn",
+	[74] = "qcom/aic200/sti.bin",
+	[76] = "qcom/aic200/tz_qti_config.mbn",
+	[78] = "qcom/aic200/pvs.bin",
+};
+
+static bool is_streaming(struct sahara_context *context)
+{
+	return !context->non_streaming;
+}
+
+static int sahara_find_image(struct sahara_context *context, u32 image_id)
+{
+	int ret;
+
+	if (image_id == context->active_image_id)
+		return 0;
+
+	if (context->active_image_id != SAHARA_IMAGE_ID_NONE) {
+		dev_err(&context->mhi_dev->dev, "image id %d is not valid as %d is active\n",
+			image_id, context->active_image_id);
+		return -EINVAL;
+	}
+
+	if (image_id >= context->table_size || !context->image_table[image_id]) {
+		dev_err(&context->mhi_dev->dev, "request for unknown image: %d\n", image_id);
+		return -EINVAL;
+	}
+
+	/*
+	 * This image might be optional. The device may continue without it.
+	 * Only the device knows. Suppress error messages that could suggest an
+	 * a problem when we were actually able to continue.
+	 */
+	ret = firmware_request_nowarn(&context->firmware,
+				      context->image_table[image_id],
+				      &context->mhi_dev->dev);
+	if (ret) {
+		dev_dbg(&context->mhi_dev->dev, "request for image id %d / file %s failed %d\n",
+			image_id, context->image_table[image_id], ret);
+		return ret;
+	}
+
+	context->active_image_id = image_id;
+
+	return 0;
+}
+
+static void sahara_release_image(struct sahara_context *context)
+{
+	if (context->active_image_id != SAHARA_IMAGE_ID_NONE)
+		release_firmware(context->firmware);
+	context->active_image_id = SAHARA_IMAGE_ID_NONE;
+}
+
+static void sahara_send_reset(struct sahara_context *context)
+{
+	int ret;
+
+	context->is_mem_dump_mode = false;
+	context->read_data_offset = 0;
+	context->read_data_length = 0;
+
+	context->tx[0]->cmd = cpu_to_le32(SAHARA_RESET_CMD);
+	context->tx[0]->length = cpu_to_le32(SAHARA_RESET_LENGTH);
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
+			    SAHARA_RESET_LENGTH, MHI_EOT);
+	if (ret)
+		dev_err(&context->mhi_dev->dev, "Unable to send reset response %d\n", ret);
+}
+
+static void sahara_hello(struct sahara_context *context)
+{
+	int ret;
+
+	dev_dbg(&context->mhi_dev->dev,
+		"HELLO cmd received. length:%d version:%d version_compat:%d max_length:%d mode:%d\n",
+		le32_to_cpu(context->rx->length),
+		le32_to_cpu(context->rx->hello.version),
+		le32_to_cpu(context->rx->hello.version_compat),
+		le32_to_cpu(context->rx->hello.max_length),
+		le32_to_cpu(context->rx->hello.mode));
+
+	if (le32_to_cpu(context->rx->length) != SAHARA_HELLO_LENGTH) {
+		dev_err(&context->mhi_dev->dev, "Malformed hello packet - length %d\n",
+			le32_to_cpu(context->rx->length));
+		return;
+	}
+	if (le32_to_cpu(context->rx->hello.version) != SAHARA_VERSION) {
+		dev_err(&context->mhi_dev->dev, "Unsupported hello packet - version %d\n",
+			le32_to_cpu(context->rx->hello.version));
+		return;
+	}
+
+	if (le32_to_cpu(context->rx->hello.mode) != SAHARA_MODE_IMAGE_TX_PENDING &&
+	    le32_to_cpu(context->rx->hello.mode) != SAHARA_MODE_IMAGE_TX_COMPLETE &&
+	    le32_to_cpu(context->rx->hello.mode) != SAHARA_MODE_MEMORY_DEBUG) {
+		dev_err(&context->mhi_dev->dev, "Unsupported hello packet - mode %d\n",
+			le32_to_cpu(context->rx->hello.mode));
+		return;
+	}
+
+	context->tx[0]->cmd = cpu_to_le32(SAHARA_HELLO_RESP_CMD);
+	context->tx[0]->length = cpu_to_le32(SAHARA_HELLO_LENGTH);
+	context->tx[0]->hello_resp.version = cpu_to_le32(SAHARA_VERSION);
+	context->tx[0]->hello_resp.version_compat = cpu_to_le32(SAHARA_VERSION);
+	context->tx[0]->hello_resp.status = cpu_to_le32(SAHARA_SUCCESS);
+	context->tx[0]->hello_resp.mode = context->rx->hello_resp.mode;
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
+			    SAHARA_HELLO_LENGTH, MHI_EOT);
+	if (ret)
+		dev_err(&context->mhi_dev->dev, "Unable to send hello response %d\n", ret);
+}
+
+static int read_data_helper(struct sahara_context *context, int buf_index)
+{
+	enum mhi_flags mhi_flag;
+	u32 pkt_data_len;
+	int ret;
+
+	pkt_data_len = min(context->read_data_length, SAHARA_PACKET_MAX_SIZE);
+
+	memcpy(context->tx[buf_index],
+	       &context->firmware->data[context->read_data_offset],
+	       pkt_data_len);
+
+	context->read_data_offset += pkt_data_len;
+	context->read_data_length -= pkt_data_len;
+
+	if (is_streaming(context) || !context->read_data_length)
+		mhi_flag = MHI_EOT;
+	else
+		mhi_flag = MHI_CHAIN;
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE,
+			    context->tx[buf_index], pkt_data_len, mhi_flag);
+	if (ret) {
+		dev_err(&context->mhi_dev->dev, "Unable to send read_data response %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void sahara_read_data(struct sahara_context *context)
+{
+	u32 image_id, data_offset, data_len;
+	int ret;
+	int i;
+
+	dev_dbg(&context->mhi_dev->dev,
+		"READ_DATA cmd received. length:%d image:%d offset:%d data_length:%d\n",
+		le32_to_cpu(context->rx->length),
+		le32_to_cpu(context->rx->read_data.image),
+		le32_to_cpu(context->rx->read_data.offset),
+		le32_to_cpu(context->rx->read_data.length));
+
+	if (le32_to_cpu(context->rx->length) != SAHARA_READ_DATA_LENGTH) {
+		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - length %d\n",
+			le32_to_cpu(context->rx->length));
+		return;
+	}
+
+	image_id = le32_to_cpu(context->rx->read_data.image);
+	data_offset = le32_to_cpu(context->rx->read_data.offset);
+	data_len = le32_to_cpu(context->rx->read_data.length);
+
+	ret = sahara_find_image(context, image_id);
+	if (ret) {
+		sahara_send_reset(context);
+		return;
+	}
+
+	/*
+	 * Image is released when the device is done with it via
+	 * SAHARA_END_OF_IMAGE_CMD. sahara_send_reset() will either cause the
+	 * device to retry the operation with a modification, or decide to be
+	 * done with the image and trigger SAHARA_END_OF_IMAGE_CMD.
+	 * release_image() is called from SAHARA_END_OF_IMAGE_CMD. processing
+	 * and is not needed here on error.
+	 */
+
+	if (context->non_streaming && data_len > SAHARA_TRANSFER_MAX_SIZE) {
+		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - data len %d exceeds max xfer size %d\n",
+			data_len, SAHARA_TRANSFER_MAX_SIZE);
+		sahara_send_reset(context);
+		return;
+	}
+
+	if (data_offset >= context->firmware->size) {
+		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - data offset %d exceeds file size %zu\n",
+			data_offset, context->firmware->size);
+		sahara_send_reset(context);
+		return;
+	}
+
+	if (size_add(data_offset, data_len) > context->firmware->size) {
+		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - data offset %d and length %d exceeds file size %zu\n",
+			data_offset, data_len, context->firmware->size);
+		sahara_send_reset(context);
+		return;
+	}
+
+	context->read_data_offset = data_offset;
+	context->read_data_length = data_len;
+
+	if (is_streaming(context)) {
+		schedule_work(&context->read_data_work);
+		return;
+	}
+
+	for (i = 0; i < SAHARA_NUM_TX_BUF && context->read_data_length; ++i) {
+		ret = read_data_helper(context, i);
+		if (ret)
+			break;
+	}
+}
+
+static void sahara_end_of_image(struct sahara_context *context)
+{
+	int ret;
+
+	dev_dbg(&context->mhi_dev->dev,
+		"END_OF_IMAGE cmd received. length:%d image:%d status:%d\n",
+		le32_to_cpu(context->rx->length),
+		le32_to_cpu(context->rx->end_of_image.image),
+		le32_to_cpu(context->rx->end_of_image.status));
+
+	if (le32_to_cpu(context->rx->length) != SAHARA_END_OF_IMAGE_LENGTH) {
+		dev_err(&context->mhi_dev->dev, "Malformed end_of_image packet - length %d\n",
+			le32_to_cpu(context->rx->length));
+		return;
+	}
+
+	if (context->active_image_id != SAHARA_IMAGE_ID_NONE &&
+	    le32_to_cpu(context->rx->end_of_image.image) != context->active_image_id) {
+		dev_err(&context->mhi_dev->dev, "Malformed end_of_image packet - image %d is not the active image\n",
+			le32_to_cpu(context->rx->end_of_image.image));
+		return;
+	}
+
+	sahara_release_image(context);
+
+	if (le32_to_cpu(context->rx->end_of_image.status))
+		return;
+
+	context->tx[0]->cmd = cpu_to_le32(SAHARA_DONE_CMD);
+	context->tx[0]->length = cpu_to_le32(SAHARA_DONE_LENGTH);
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
+			    SAHARA_DONE_LENGTH, MHI_EOT);
+	if (ret)
+		dev_dbg(&context->mhi_dev->dev, "Unable to send done response %d\n", ret);
+}
+
+static void sahara_memory_debug64(struct sahara_context *context)
+{
+	int ret;
+
+	dev_dbg(&context->mhi_dev->dev,
+		"MEMORY DEBUG64 cmd received. length:%d table_address:%#llx table_length:%#llx\n",
+		le32_to_cpu(context->rx->length),
+		le64_to_cpu(context->rx->memory_debug64.table_address),
+		le64_to_cpu(context->rx->memory_debug64.table_length));
+
+	if (le32_to_cpu(context->rx->length) != SAHARA_MEM_DEBUG64_LENGTH) {
+		dev_err(&context->mhi_dev->dev, "Malformed memory debug64 packet - length %d\n",
+			le32_to_cpu(context->rx->length));
+		return;
+	}
+
+	context->dump_table_address = le64_to_cpu(context->rx->memory_debug64.table_address);
+	context->dump_table_length = le64_to_cpu(context->rx->memory_debug64.table_length);
+
+	if (context->dump_table_length % sizeof(struct sahara_debug_table_entry64) != 0 ||
+	    !context->dump_table_length) {
+		dev_err(&context->mhi_dev->dev, "Malformed memory debug64 packet - table length %lld\n",
+			context->dump_table_length);
+		return;
+	}
+
+	/*
+	 * From this point, the protocol flips. We make memory_read requests to
+	 * the device, and the device responds with the raw data. If the device
+	 * has an error, it will send an End of Image command. First we need to
+	 * request the memory dump table so that we know where all the pieces
+	 * of the dump are that we can consume.
+	 */
+
+	context->is_mem_dump_mode = true;
+
+	/*
+	 * Assume that the table is smaller than our MTU so that we can read it
+	 * in one shot. The spec does not put an upper limit on the table, but
+	 * no known device will exceed this.
+	 */
+	if (context->dump_table_length > SAHARA_PACKET_MAX_SIZE) {
+		dev_err(&context->mhi_dev->dev, "Memory dump table length %lld exceeds supported size. Discarding dump\n",
+			context->dump_table_length);
+		sahara_send_reset(context);
+		return;
+	}
+
+	context->tx[0]->cmd = cpu_to_le32(SAHARA_MEM_READ64_CMD);
+	context->tx[0]->length = cpu_to_le32(SAHARA_MEM_READ64_LENGTH);
+	context->tx[0]->memory_read64.memory_address = cpu_to_le64(context->dump_table_address);
+	context->tx[0]->memory_read64.memory_length = cpu_to_le64(context->dump_table_length);
+
+	context->rx_size_requested = context->dump_table_length;
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
+			    SAHARA_MEM_READ64_LENGTH, MHI_EOT);
+	if (ret)
+		dev_err(&context->mhi_dev->dev, "Unable to send read for dump table %d\n", ret);
+}
+
+static void sahara_processing(struct work_struct *work)
+{
+	struct sahara_context *context = container_of(work, struct sahara_context, fw_work);
+	int ret;
+
+	switch (le32_to_cpu(context->rx->cmd)) {
+	case SAHARA_HELLO_CMD:
+		sahara_hello(context);
+		break;
+	case SAHARA_READ_DATA_CMD:
+		sahara_read_data(context);
+		break;
+	case SAHARA_END_OF_IMAGE_CMD:
+		sahara_end_of_image(context);
+		break;
+	case SAHARA_DONE_RESP_CMD:
+		/* Intentional do nothing as we don't need to exit an app */
+		break;
+	case SAHARA_RESET_RESP_CMD:
+		/* Intentional do nothing as we don't need to exit an app */
+		break;
+	case SAHARA_MEM_DEBUG64_CMD:
+		sahara_memory_debug64(context);
+		break;
+	default:
+		dev_err(&context->mhi_dev->dev, "Unknown command %d\n",
+			le32_to_cpu(context->rx->cmd));
+		break;
+	}
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_FROM_DEVICE, context->rx,
+			    SAHARA_PACKET_MAX_SIZE, MHI_EOT);
+	if (ret)
+		dev_err(&context->mhi_dev->dev, "Unable to requeue rx buf %d\n", ret);
+}
+
+static void sahara_parse_dump_table(struct sahara_context *context)
+{
+	struct sahara_dump_table_entry *image_out_table;
+	struct sahara_debug_table_entry64 *dev_table;
+	struct sahara_memory_dump_meta_v1 *dump_meta;
+	u64 table_nents;
+	u64 dump_length;
+	u64 mul_bytes;
+	int ret;
+	u64 i;
+
+	table_nents = context->dump_table_length / sizeof(*dev_table);
+	context->dump_images_left = table_nents;
+	dump_length = 0;
+
+	dev_table = (struct sahara_debug_table_entry64 *)(context->rx);
+	for (i = 0; i < table_nents; ++i) {
+		/* Do not trust the device, ensure the strings are terminated */
+		dev_table[i].description[SAHARA_TABLE_ENTRY_STR_LEN - 1] = 0;
+		dev_table[i].filename[SAHARA_TABLE_ENTRY_STR_LEN - 1] = 0;
+
+		if (check_add_overflow(dump_length,
+				       le64_to_cpu(dev_table[i].length),
+				       &dump_length)) {
+			/* Discard the dump */
+			sahara_send_reset(context);
+			return;
+		}
+
+		dev_dbg(&context->mhi_dev->dev,
+			"Memory dump table entry %lld type: %lld address: %#llx length: %#llx description: \"%s\" filename \"%s\"\n",
+			i,
+			le64_to_cpu(dev_table[i].type),
+			le64_to_cpu(dev_table[i].address),
+			le64_to_cpu(dev_table[i].length),
+			dev_table[i].description,
+			dev_table[i].filename);
+	}
+
+	if (check_add_overflow(dump_length, (u64)sizeof(*dump_meta), &dump_length)) {
+		/* Discard the dump */
+		sahara_send_reset(context);
+		return;
+	}
+	if (check_mul_overflow((u64)sizeof(*image_out_table), table_nents, &mul_bytes)) {
+		/* Discard the dump */
+		sahara_send_reset(context);
+		return;
+	}
+	if (check_add_overflow(dump_length, mul_bytes, &dump_length)) {
+		/* Discard the dump */
+		sahara_send_reset(context);
+		return;
+	}
+
+	context->mem_dump_sz = dump_length;
+	context->mem_dump = vzalloc(dump_length);
+	if (!context->mem_dump) {
+		/* Discard the dump */
+		sahara_send_reset(context);
+		return;
+	}
+
+	/* Populate the dump metadata and table for userspace */
+	dump_meta = context->mem_dump;
+	dump_meta->magic = SAHARA_DUMP_V1_MAGIC;
+	dump_meta->version = SAHARA_DUMP_V1_VER;
+	dump_meta->dump_size = dump_length;
+	dump_meta->table_size = context->dump_table_length;
+
+	image_out_table = context->mem_dump + sizeof(*dump_meta);
+	for (i = 0; i < table_nents; ++i) {
+		image_out_table[i].type = le64_to_cpu(dev_table[i].type);
+		image_out_table[i].address = le64_to_cpu(dev_table[i].address);
+		image_out_table[i].length = le64_to_cpu(dev_table[i].length);
+		strscpy(image_out_table[i].description, dev_table[i].description,
+			SAHARA_TABLE_ENTRY_STR_LEN);
+		strscpy(image_out_table[i].filename,
+			dev_table[i].filename,
+			SAHARA_TABLE_ENTRY_STR_LEN);
+	}
+
+	context->mem_dump_freespace = &image_out_table[i];
+
+	/* Done parsing the table, switch to image dump mode */
+	context->dump_table_length = 0;
+
+	/* Request the first chunk of the first image */
+	context->dump_image = &image_out_table[0];
+	dump_length = min_t(u64, context->dump_image->length, SAHARA_READ_MAX_SIZE);
+	/* Avoid requesting EOI sized data so that we can identify errors */
+	if (dump_length == SAHARA_END_OF_IMAGE_LENGTH)
+		dump_length = SAHARA_END_OF_IMAGE_LENGTH / 2;
+
+	context->dump_image_offset = dump_length;
+
+	context->tx[0]->cmd = cpu_to_le32(SAHARA_MEM_READ64_CMD);
+	context->tx[0]->length = cpu_to_le32(SAHARA_MEM_READ64_LENGTH);
+	context->tx[0]->memory_read64.memory_address = cpu_to_le64(context->dump_image->address);
+	context->tx[0]->memory_read64.memory_length = cpu_to_le64(dump_length);
+
+	context->rx_size_requested = dump_length;
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
+			    SAHARA_MEM_READ64_LENGTH, MHI_EOT);
+	if (ret)
+		dev_err(&context->mhi_dev->dev, "Unable to send read for dump content %d\n", ret);
+}
+
+static void sahara_parse_dump_image(struct sahara_context *context)
+{
+	u64 dump_length;
+	int ret;
+
+	memcpy(context->mem_dump_freespace, context->rx, context->rx_size);
+	context->mem_dump_freespace += context->rx_size;
+
+	if (context->dump_image_offset >= context->dump_image->length) {
+		/* Need to move to next image */
+		context->dump_image++;
+		context->dump_images_left--;
+		context->dump_image_offset = 0;
+
+		if (!context->dump_images_left) {
+			/* Dump done */
+			dev_coredumpv(context->mhi_dev->mhi_cntrl->cntrl_dev,
+				      context->mem_dump,
+				      context->mem_dump_sz,
+				      GFP_KERNEL);
+			context->mem_dump = NULL;
+			sahara_send_reset(context);
+			return;
+		}
+	}
+
+	/* Get next image chunk */
+	dump_length = context->dump_image->length - context->dump_image_offset;
+	dump_length = min_t(u64, dump_length, SAHARA_READ_MAX_SIZE);
+	/* Avoid requesting EOI sized data so that we can identify errors */
+	if (dump_length == SAHARA_END_OF_IMAGE_LENGTH)
+		dump_length = SAHARA_END_OF_IMAGE_LENGTH / 2;
+
+	context->tx[0]->cmd = cpu_to_le32(SAHARA_MEM_READ64_CMD);
+	context->tx[0]->length = cpu_to_le32(SAHARA_MEM_READ64_LENGTH);
+	context->tx[0]->memory_read64.memory_address =
+		cpu_to_le64(context->dump_image->address + context->dump_image_offset);
+	context->tx[0]->memory_read64.memory_length = cpu_to_le64(dump_length);
+
+	context->dump_image_offset += dump_length;
+	context->rx_size_requested = dump_length;
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
+			    SAHARA_MEM_READ64_LENGTH, MHI_EOT);
+	if (ret)
+		dev_err(&context->mhi_dev->dev,
+			"Unable to send read for dump content %d\n", ret);
+}
+
+static void sahara_dump_processing(struct work_struct *work)
+{
+	struct sahara_context *context = container_of(work, struct sahara_context, dump_work);
+	int ret;
+
+	/*
+	 * We should get the expected raw data, but if the device has an error
+	 * it is supposed to send EOI with an error code.
+	 */
+	if (context->rx_size != context->rx_size_requested &&
+	    context->rx_size != SAHARA_END_OF_IMAGE_LENGTH) {
+		dev_err(&context->mhi_dev->dev,
+			"Unexpected response to read_data. Expected size: %#zx got: %#zx\n",
+			context->rx_size_requested,
+			context->rx_size);
+		goto error;
+	}
+
+	if (context->rx_size == SAHARA_END_OF_IMAGE_LENGTH &&
+	    le32_to_cpu(context->rx->cmd) == SAHARA_END_OF_IMAGE_CMD) {
+		dev_err(&context->mhi_dev->dev,
+			"Unexpected EOI response to read_data. Status: %d\n",
+			le32_to_cpu(context->rx->end_of_image.status));
+		goto error;
+	}
+
+	if (context->rx_size == SAHARA_END_OF_IMAGE_LENGTH &&
+	    le32_to_cpu(context->rx->cmd) != SAHARA_END_OF_IMAGE_CMD) {
+		dev_err(&context->mhi_dev->dev,
+			"Invalid EOI response to read_data. CMD: %d\n",
+			le32_to_cpu(context->rx->cmd));
+		goto error;
+	}
+
+	/*
+	 * Need to know if we received the dump table, or part of a dump image.
+	 * Since we get raw data, we cannot tell from the data itself. Instead,
+	 * we use the stored dump_table_length, which we zero after we read and
+	 * process the entire table.
+	 */
+	if (context->dump_table_length)
+		sahara_parse_dump_table(context);
+	else
+		sahara_parse_dump_image(context);
+
+	ret = mhi_queue_buf(context->mhi_dev, DMA_FROM_DEVICE, context->rx,
+			    SAHARA_PACKET_MAX_SIZE, MHI_EOT);
+	if (ret)
+		dev_err(&context->mhi_dev->dev, "Unable to requeue rx buf %d\n", ret);
+
+	return;
+
+error:
+	vfree(context->mem_dump);
+	context->mem_dump = NULL;
+	sahara_send_reset(context);
+}
+
+static void sahara_read_data_processing(struct work_struct *work)
+{
+	struct sahara_context *context = container_of(work, struct sahara_context, read_data_work);
+
+	read_data_helper(context, 0);
+}
+
+static int sahara_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+	struct sahara_context *context;
+	int ret;
+	int i;
+
+	context = devm_kzalloc(&mhi_dev->dev, sizeof(*context), GFP_KERNEL);
+	if (!context)
+		return -ENOMEM;
+
+	context->rx = devm_kzalloc(&mhi_dev->dev, SAHARA_PACKET_MAX_SIZE, GFP_KERNEL);
+	if (!context->rx)
+		return -ENOMEM;
+
+	if (!strcmp(mhi_dev->mhi_cntrl->name, "AIC200")) {
+		context->image_table = aic200_image_table;
+		context->table_size = ARRAY_SIZE(aic200_image_table);
+	} else {
+		context->image_table = aic100_image_table;
+		context->table_size = ARRAY_SIZE(aic100_image_table);
+		context->non_streaming = true;
+	}
+
+	/*
+	 * There are two firmware implementations for READ_DATA handling.
+	 * The older "SBL" implementation defines a Sahara transfer size, and
+	 * expects that the response is a single transport transfer. If the
+	 * FW wants to transfer a file that is larger than the transfer size,
+	 * the FW will issue multiple READ_DATA commands. For this
+	 * implementation, we need to allocate enough buffers to contain the
+	 * entire Sahara transfer size.
+	 *
+	 * The newer "XBL" implementation does not define a maximum transfer
+	 * size and instead expects the data to be streamed over using the
+	 * transport level MTU. The FW will issue a single READ_DATA command
+	 * of whatever size, and consume multiple transport level transfers
+	 * until the expected amount of data is consumed. For this
+	 * implementation we only need a single buffer of the transport MTU
+	 * but we'll need to be able to use it multiple times for a single
+	 * READ_DATA request.
+	 *
+	 * AIC100 is the SBL implementation and defines SAHARA_TRANSFER_MAX_SIZE
+	 * and we need 9x SAHARA_PACKET_MAX_SIZE to cover that. We can use
+	 * MHI_CHAIN to link multiple buffers into a single transfer but the
+	 * remote side will not consume the buffers until it sees an EOT, thus
+	 * we need to allocate enough buffers to put in the tx fifo to cover an
+	 * entire READ_DATA request of the max size.
+	 *
+	 * AIC200 is the XBL implementation, and so a single buffer will work.
+	 */
+	for (i = 0; i < SAHARA_NUM_TX_BUF; ++i) {
+		context->tx[i] = devm_kzalloc(&mhi_dev->dev,
+					      SAHARA_PACKET_MAX_SIZE,
+					      GFP_KERNEL);
+		if (!context->tx[i])
+			return -ENOMEM;
+		if (is_streaming(context))
+			break;
+	}
+
+	context->mhi_dev = mhi_dev;
+	INIT_WORK(&context->fw_work, sahara_processing);
+	INIT_WORK(&context->dump_work, sahara_dump_processing);
+	INIT_WORK(&context->read_data_work, sahara_read_data_processing);
+
+	context->active_image_id = SAHARA_IMAGE_ID_NONE;
+	dev_set_drvdata(&mhi_dev->dev, context);
+
+	ret = mhi_prepare_for_transfer(mhi_dev);
+	if (ret)
+		return ret;
+
+	ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, context->rx, SAHARA_PACKET_MAX_SIZE, MHI_EOT);
+	if (ret) {
+		mhi_unprepare_from_transfer(mhi_dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void sahara_mhi_remove(struct mhi_device *mhi_dev)
+{
+	struct sahara_context *context = dev_get_drvdata(&mhi_dev->dev);
+
+	cancel_work_sync(&context->fw_work);
+	cancel_work_sync(&context->dump_work);
+	vfree(context->mem_dump);
+	sahara_release_image(context);
+	mhi_unprepare_from_transfer(mhi_dev);
+}
+
+static void sahara_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct sahara_context *context = dev_get_drvdata(&mhi_dev->dev);
+
+	if (!mhi_result->transaction_status && context->read_data_length && is_streaming(context))
+		schedule_work(&context->read_data_work);
+}
+
+static void sahara_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+	struct sahara_context *context = dev_get_drvdata(&mhi_dev->dev);
+
+	if (!mhi_result->transaction_status) {
+		context->rx_size = mhi_result->bytes_xferd;
+		if (context->is_mem_dump_mode)
+			schedule_work(&context->dump_work);
+		else
+			schedule_work(&context->fw_work);
+	}
+
+}
+
+static const struct mhi_device_id sahara_mhi_match_table[] = {
+	{ .chan = "QAIC_SAHARA", },
+	{},
+};
+
+static struct mhi_driver sahara_mhi_driver = {
+	.id_table = sahara_mhi_match_table,
+	.remove = sahara_mhi_remove,
+	.probe = sahara_mhi_probe,
+	.ul_xfer_cb = sahara_mhi_ul_xfer_cb,
+	.dl_xfer_cb = sahara_mhi_dl_xfer_cb,
+	.driver = {
+		.name = "sahara",
+	},
+};
+
+int sahara_register(void)
+{
+	return mhi_driver_register(&sahara_mhi_driver);
+}
+
+void sahara_unregister(void)
+{
+	mhi_driver_unregister(&sahara_mhi_driver);
+}
diff --git a/drivers/accel/qaic/sahara.h b/drivers/accel/qaic/sahara.h
new file mode 100644
index 000000000..640208acc
--- /dev/null
+++ b/drivers/accel/qaic/sahara.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#ifndef __SAHARA_H__
+#define __SAHARA_H__
+
+int sahara_register(void);
+void sahara_unregister(void);
+#endif /* __SAHARA_H__ */