From f4cdf7ca9a1fdcca413157df19753f388a5a224e Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 19 Aug 2026 10:09:22 -0700 Subject: Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - v4l2-core: added ISP statistics support and per-block validation - v4l2-core: Allow unknown HDR10 white point and luminance - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor - New codec: Milos: VPU v2.0 codec support - isp driver: gained support for Dreamchip RPPX1 ISP framework - vsp1 driver: gained support for RZ/T2H and RZ/N2H - Novalake driver: gained CVS support for new NVL hardware - dvb-core: fix feed leak on failed DMX_ADD_PID - several driver fixes, cleanups and minor improvements * tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits) media: ipu-bridge: check all DMI entries when overriding sensor rotation media: v4l2-async: avoid deleting unlinked ASC entry on link error media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement media: intel/ipu6: fix async notifier cleanup leak on parse error media: staging/ipu7: fix async notifier UAF on probe error path media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem() media: rcar-isp: Fix VSPX reference leaks media: rcar-isp: Release ISPCORE resources media: i2c: imx415: Release runtime PM reference on VBLANK error media: i2c: imx415: Return test pattern write errors media: renesas: vsp1: Declare index variables in for loop statement media: renesas: vsp1: Make reset control optional to support platforms without a reset line media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs media: nxp: imx8-isi: Add additional 32-bit RGB format support media: nxp: imx8-isi: Add 16-bit raw Bayer format support media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks media: nxp: imx8-isi: Correct color map between V4L2 and ISI ... --- drivers/firmware/efi/ovmf-debug-log.c | 111 ++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 drivers/firmware/efi/ovmf-debug-log.c (limited to 'drivers/firmware/efi/ovmf-debug-log.c') diff --git a/drivers/firmware/efi/ovmf-debug-log.c b/drivers/firmware/efi/ovmf-debug-log.c new file mode 100644 index 000000000..5b2471ffa --- /dev/null +++ b/drivers/firmware/efi/ovmf-debug-log.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include + +#define OVMF_DEBUG_LOG_MAGIC1 0x3167646d666d766f // "ovmfmdg1" +#define OVMF_DEBUG_LOG_MAGIC2 0x3267646d666d766f // "ovmfmdg2" + +struct ovmf_debug_log_header { + u64 magic1; + u64 magic2; + u64 hdr_size; + u64 log_size; + u64 lock; // edk2 spinlock + u64 head_off; + u64 tail_off; + u64 truncated; + u8 fw_version[128]; +}; + +static struct ovmf_debug_log_header *hdr; +static u8 *logbuf; +static u64 logbufsize; + +static ssize_t ovmf_log_read(struct file *filp, struct kobject *kobj, + const struct bin_attribute *attr, char *buf, + loff_t offset, size_t count) +{ + u64 start, end; + + start = hdr->head_off + offset; + if (hdr->head_off > hdr->tail_off && start >= hdr->log_size) + start -= hdr->log_size; + + end = start + count; + if (start > hdr->tail_off) { + if (end > hdr->log_size) + end = hdr->log_size; + } else { + if (end > hdr->tail_off) + end = hdr->tail_off; + } + + if (start > logbufsize || end > logbufsize) + return 0; + if (start >= end) + return 0; + + memcpy(buf, logbuf + start, end - start); + return end - start; +} + +static struct bin_attribute ovmf_log_bin_attr = { + .attr = { + .name = "ovmf_debug_log", + .mode = 0444, + }, + .read = ovmf_log_read, +}; + +int __init ovmf_log_probe(unsigned long ovmf_debug_log_table) +{ + int ret = -EINVAL; + u64 size; + + /* map + verify header */ + hdr = memremap(ovmf_debug_log_table, sizeof(*hdr), MEMREMAP_WB); + if (!hdr) { + pr_err("OVMF debug log: header map failed\n"); + return -EINVAL; + } + + if (hdr->magic1 != OVMF_DEBUG_LOG_MAGIC1 || + hdr->magic2 != OVMF_DEBUG_LOG_MAGIC2) { + printk(KERN_ERR "OVMF debug log: magic mismatch\n"); + goto err_unmap; + } + + size = hdr->hdr_size + hdr->log_size; + pr_info("OVMF debug log: firmware version: \"%s\"\n", hdr->fw_version); + pr_info("OVMF debug log: buffer size: %lluk\n", size / 1024); + + /* map complete log buffer */ + memunmap(hdr); + hdr = memremap(ovmf_debug_log_table, size, MEMREMAP_WB); + if (!hdr) { + pr_err("OVMF debug log: buffer map failed\n"); + return -EINVAL; + } + logbuf = (void *)hdr + hdr->hdr_size; + logbufsize = hdr->log_size; + + ovmf_log_bin_attr.size = size; + ret = sysfs_create_bin_file(efi_kobj, &ovmf_log_bin_attr); + if (ret != 0) { + pr_err("OVMF debug log: sysfs register failed\n"); + goto err_unmap; + } + + return 0; + +err_unmap: + memunmap(hdr); + return ret; +} -- cgit v1.3.1