Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 468 insertions, 0 deletions

diff --git a/drivers/input/mouse/vmmouse.c b/drivers/input/mouse/vmmouse.c
new file mode 100644
index 000000000..aaecdd3d5
--- /dev/null
+++ b/drivers/input/mouse/vmmouse.c
@@ -0,0 +1,468 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Virtual PS/2 Mouse on VMware and QEMU hypervisors.
+ *
+ * Copyright (C) 2014, VMware, Inc. All Rights Reserved.
+ *
+ * Twin device code is hugely inspired by the ALPS driver.
+ * Authors:
+ *   Dmitry Torokhov <dmitry.torokhov@gmail.com>
+ *   Thomas Hellstrom <thellstrom@vmware.com>
+ */
+
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <asm/hypervisor.h>
+#include <asm/vmware.h>
+
+#include "psmouse.h"
+#include "vmmouse.h"
+
+/*
+ * Main commands supported by the vmmouse hypervisor port.
+ */
+#define VMWARE_CMD_ABSPOINTER_DATA	39
+#define VMWARE_CMD_ABSPOINTER_STATUS	40
+#define VMWARE_CMD_ABSPOINTER_COMMAND	41
+#define VMWARE_CMD_ABSPOINTER_RESTRICT	86
+
+/*
+ * Subcommands for VMWARE_CMD_ABSPOINTER_COMMAND
+ */
+#define VMMOUSE_CMD_ENABLE			0x45414552U
+#define VMMOUSE_CMD_DISABLE			0x000000f5U
+#define VMMOUSE_CMD_REQUEST_RELATIVE		0x4c455252U
+#define VMMOUSE_CMD_REQUEST_ABSOLUTE		0x53424152U
+
+#define VMMOUSE_ERROR				0xffff0000U
+
+#define VMMOUSE_VERSION_ID			0x3442554aU
+
+#define VMMOUSE_RELATIVE_PACKET			0x00010000U
+
+#define VMMOUSE_LEFT_BUTTON			0x20
+#define VMMOUSE_RIGHT_BUTTON			0x10
+#define VMMOUSE_MIDDLE_BUTTON			0x08
+
+/*
+ * VMMouse Restrict command
+ */
+#define VMMOUSE_RESTRICT_ANY                    0x00
+#define VMMOUSE_RESTRICT_CPL0                   0x01
+#define VMMOUSE_RESTRICT_IOPL                   0x02
+
+#define VMMOUSE_MAX_X                           0xFFFF
+#define VMMOUSE_MAX_Y                           0xFFFF
+
+#define VMMOUSE_VENDOR "VMware"
+#define VMMOUSE_NAME   "VMMouse"
+
+/**
+ * struct vmmouse_data - private data structure for the vmmouse driver
+ *
+ * @abs_dev: "Absolute" device used to report absolute mouse movement.
+ * @phys: Physical path for the absolute device.
+ * @dev_name: Name attribute name for the absolute device.
+ */
+struct vmmouse_data {
+	struct input_dev *abs_dev;
+	char phys[32];
+	char dev_name[128];
+};
+
+/**
+ * vmmouse_report_button - report button state on the correct input device
+ *
+ * @psmouse:  Pointer to the psmouse struct
+ * @abs_dev:  The absolute input device
+ * @rel_dev:  The relative input device
+ * @pref_dev: The preferred device for reporting
+ * @code:     Button code
+ * @value:    Button value
+ *
+ * Report @value and @code on @pref_dev, unless the button is already
+ * pressed on the other device, in which case the state is reported on that
+ * device.
+ */
+static void vmmouse_report_button(struct psmouse *psmouse,
+				  struct input_dev *abs_dev,
+				  struct input_dev *rel_dev,
+				  struct input_dev *pref_dev,
+				  unsigned int code, int value)
+{
+	if (test_bit(code, abs_dev->key))
+		pref_dev = abs_dev;
+	else if (test_bit(code, rel_dev->key))
+		pref_dev = rel_dev;
+
+	input_report_key(pref_dev, code, value);
+}
+
+/**
+ * vmmouse_report_events - process events on the vmmouse communications channel
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * This function pulls events from the vmmouse communications channel and
+ * reports them on the correct (absolute or relative) input device. When the
+ * communications channel is drained, or if we've processed more than 255
+ * psmouse commands, the function returns PSMOUSE_FULL_PACKET. If there is a
+ * host- or synchronization error, the function returns PSMOUSE_BAD_DATA in
+ * the hope that the caller will reset the communications channel.
+ */
+static psmouse_ret_t vmmouse_report_events(struct psmouse *psmouse)
+{
+	struct input_dev *rel_dev = psmouse->dev;
+	struct vmmouse_data *priv = psmouse->private;
+	struct input_dev *abs_dev = priv->abs_dev;
+	struct input_dev *pref_dev;
+	u32 status, x, y, z;
+	unsigned int queue_length;
+	unsigned int count = 255;
+
+	while (count--) {
+		/* See if we have motion data. */
+		status = vmware_hypercall1(VMWARE_CMD_ABSPOINTER_STATUS, 0);
+		if ((status & VMMOUSE_ERROR) == VMMOUSE_ERROR) {
+			psmouse_err(psmouse, "failed to fetch status data\n");
+			/*
+			 * After a few attempts this will result in
+			 * reconnect.
+			 */
+			return PSMOUSE_BAD_DATA;
+		}
+
+		queue_length = status & 0xffff;
+		if (queue_length == 0)
+			break;
+
+		if (queue_length % 4) {
+			psmouse_err(psmouse, "invalid queue length\n");
+			return PSMOUSE_BAD_DATA;
+		}
+
+		/* Now get it */
+		status = vmware_hypercall4(VMWARE_CMD_ABSPOINTER_DATA, 4,
+					   &x, &y, &z);
+
+		/*
+		 * And report what we've got. Prefer to report button
+		 * events on the same device where we report motion events.
+		 * This doesn't work well with the mouse wheel, though. See
+		 * below. Ideally we would want to report that on the
+		 * preferred device as well.
+		 */
+		if (status & VMMOUSE_RELATIVE_PACKET) {
+			pref_dev = rel_dev;
+			input_report_rel(rel_dev, REL_X, (s32)x);
+			input_report_rel(rel_dev, REL_Y, -(s32)y);
+		} else {
+			pref_dev = abs_dev;
+			input_report_abs(abs_dev, ABS_X, x);
+			input_report_abs(abs_dev, ABS_Y, y);
+		}
+
+		/* Xorg seems to ignore wheel events on absolute devices */
+		input_report_rel(rel_dev, REL_WHEEL, -(s8)((u8) z));
+
+		vmmouse_report_button(psmouse, abs_dev, rel_dev,
+				      pref_dev, BTN_LEFT,
+				      status & VMMOUSE_LEFT_BUTTON);
+		vmmouse_report_button(psmouse, abs_dev, rel_dev,
+				      pref_dev, BTN_RIGHT,
+				      status & VMMOUSE_RIGHT_BUTTON);
+		vmmouse_report_button(psmouse, abs_dev, rel_dev,
+				      pref_dev, BTN_MIDDLE,
+				      status & VMMOUSE_MIDDLE_BUTTON);
+		input_sync(abs_dev);
+		input_sync(rel_dev);
+	}
+
+	return PSMOUSE_FULL_PACKET;
+}
+
+/**
+ * vmmouse_process_byte - process data on the ps/2 channel
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * When the ps/2 channel indicates that there is vmmouse data available,
+ * call vmmouse channel processing. Otherwise, continue to accept bytes. If
+ * there is a synchronization or communication data error, return
+ * PSMOUSE_BAD_DATA in the hope that the caller will reset the mouse.
+ */
+static psmouse_ret_t vmmouse_process_byte(struct psmouse *psmouse)
+{
+	unsigned char *packet = psmouse->packet;
+
+	switch (psmouse->pktcnt) {
+	case 1:
+		return (packet[0] & 0x8) == 0x8 ?
+			PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
+
+	case 2:
+		return PSMOUSE_GOOD_DATA;
+
+	default:
+		return vmmouse_report_events(psmouse);
+	}
+}
+
+/**
+ * vmmouse_disable - Disable vmmouse
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * Tries to disable vmmouse mode.
+ */
+static void vmmouse_disable(struct psmouse *psmouse)
+{
+	u32 status;
+
+	vmware_hypercall1(VMWARE_CMD_ABSPOINTER_COMMAND, VMMOUSE_CMD_DISABLE);
+
+	status = vmware_hypercall1(VMWARE_CMD_ABSPOINTER_STATUS, 0);
+	if ((status & VMMOUSE_ERROR) != VMMOUSE_ERROR)
+		psmouse_warn(psmouse, "failed to disable vmmouse device\n");
+}
+
+/**
+ * vmmouse_enable - Enable vmmouse and request absolute mode.
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * Tries to enable vmmouse mode. Performs basic checks and requests
+ * absolute vmmouse mode.
+ * Returns 0 on success, -ENODEV on failure.
+ */
+static int vmmouse_enable(struct psmouse *psmouse)
+{
+	u32 status, version;
+
+	/*
+	 * Try enabling the device. If successful, we should be able to
+	 * read valid version ID back from it.
+	 */
+	vmware_hypercall1(VMWARE_CMD_ABSPOINTER_COMMAND, VMMOUSE_CMD_ENABLE);
+
+	/*
+	 * See if version ID can be retrieved.
+	 */
+	status = vmware_hypercall1(VMWARE_CMD_ABSPOINTER_STATUS, 0);
+	if ((status & 0x0000ffff) == 0) {
+		psmouse_dbg(psmouse, "empty flags - assuming no device\n");
+		return -ENXIO;
+	}
+
+	version = vmware_hypercall1(VMWARE_CMD_ABSPOINTER_DATA,
+				    1 /* single item */);
+	if (version != VMMOUSE_VERSION_ID) {
+		psmouse_dbg(psmouse, "Unexpected version value: %u vs %u\n",
+			    (unsigned) version, VMMOUSE_VERSION_ID);
+		vmmouse_disable(psmouse);
+		return -ENXIO;
+	}
+
+	/*
+	 * Restrict ioport access, if possible.
+	 */
+	vmware_hypercall1(VMWARE_CMD_ABSPOINTER_RESTRICT,
+			  VMMOUSE_RESTRICT_CPL0);
+
+	vmware_hypercall1(VMWARE_CMD_ABSPOINTER_COMMAND,
+			  VMMOUSE_CMD_REQUEST_ABSOLUTE);
+
+	return 0;
+}
+
+/*
+ * Array of supported hypervisors.
+ */
+static enum x86_hypervisor_type vmmouse_supported_hypervisors[] = {
+	X86_HYPER_VMWARE,
+	X86_HYPER_KVM,
+};
+
+/**
+ * vmmouse_check_hypervisor - Check if we're running on a supported hypervisor
+ */
+static bool vmmouse_check_hypervisor(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(vmmouse_supported_hypervisors); i++)
+		if (vmmouse_supported_hypervisors[i] == x86_hyper_type)
+			return true;
+
+	return false;
+}
+
+/**
+ * vmmouse_detect - Probe whether vmmouse is available
+ *
+ * @psmouse: Pointer to the psmouse struct
+ * @set_properties: Whether to set psmouse name and vendor
+ *
+ * Returns 0 if vmmouse channel is available. Negative error code if not.
+ */
+int vmmouse_detect(struct psmouse *psmouse, bool set_properties)
+{
+	u32 response, version, type;
+
+	if (!vmmouse_check_hypervisor()) {
+		psmouse_dbg(psmouse,
+			    "VMMouse not running on supported hypervisor.\n");
+		return -ENXIO;
+	}
+
+	/* Check if the device is present */
+	response = ~VMWARE_HYPERVISOR_MAGIC;
+	version = vmware_hypercall3(VMWARE_CMD_GETVERSION, 0, &response, &type);
+	if (response != VMWARE_HYPERVISOR_MAGIC || version == 0xffffffffU)
+		return -ENXIO;
+
+	if (set_properties) {
+		psmouse->vendor = VMMOUSE_VENDOR;
+		psmouse->name = VMMOUSE_NAME;
+		psmouse->model = version;
+	}
+
+	return 0;
+}
+
+/**
+ * vmmouse_reset - Disable vmmouse and reset
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * Tries to disable vmmouse mode before enter suspend.
+ */
+static void vmmouse_reset(struct psmouse *psmouse)
+{
+	vmmouse_disable(psmouse);
+	psmouse_reset(psmouse);
+}
+
+/**
+ * vmmouse_disconnect - Take down vmmouse driver
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * Takes down vmmouse driver and frees resources set up in vmmouse_init().
+ */
+static void vmmouse_disconnect(struct psmouse *psmouse)
+{
+	struct vmmouse_data *priv = psmouse->private;
+
+	vmmouse_disable(psmouse);
+	psmouse_reset(psmouse);
+	input_unregister_device(priv->abs_dev);
+	kfree(priv);
+}
+
+/**
+ * vmmouse_reconnect - Reset the ps/2 - and vmmouse connections
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * Attempts to reset the mouse connections. Returns 0 on success and
+ * -1 on failure.
+ */
+static int vmmouse_reconnect(struct psmouse *psmouse)
+{
+	int error;
+
+	psmouse_reset(psmouse);
+	vmmouse_disable(psmouse);
+	error = vmmouse_enable(psmouse);
+	if (error) {
+		psmouse_err(psmouse,
+			    "Unable to re-enable mouse when reconnecting, err: %d\n",
+			    error);
+		return error;
+	}
+
+	return 0;
+}
+
+/**
+ * vmmouse_init - Initialize the vmmouse driver
+ *
+ * @psmouse: Pointer to the psmouse struct
+ *
+ * Requests the device and tries to enable vmmouse mode.
+ * If successful, sets up the input device for relative movement events.
+ * It also allocates another input device and sets it up for absolute motion
+ * events. Returns 0 on success and -1 on failure.
+ */
+int vmmouse_init(struct psmouse *psmouse)
+{
+	struct vmmouse_data *priv;
+	struct input_dev *rel_dev = psmouse->dev, *abs_dev;
+	int error;
+
+	psmouse_reset(psmouse);
+	error = vmmouse_enable(psmouse);
+	if (error)
+		return error;
+
+	priv = kzalloc_obj(*priv);
+	abs_dev = input_allocate_device();
+	if (!priv || !abs_dev) {
+		error = -ENOMEM;
+		goto init_fail;
+	}
+
+	priv->abs_dev = abs_dev;
+	psmouse->private = priv;
+
+	/* Set up and register absolute device */
+	snprintf(priv->phys, sizeof(priv->phys), "%s/input1",
+		 psmouse->ps2dev.serio->phys);
+
+	/* Mimic name setup for relative device in psmouse-base.c */
+	snprintf(priv->dev_name, sizeof(priv->dev_name), "%s %s %s",
+		 VMMOUSE_PSNAME, VMMOUSE_VENDOR, VMMOUSE_NAME);
+	abs_dev->phys = priv->phys;
+	abs_dev->name = priv->dev_name;
+	abs_dev->id.bustype = BUS_I8042;
+	abs_dev->id.vendor = 0x0002;
+	abs_dev->id.product = PSMOUSE_VMMOUSE;
+	abs_dev->id.version = psmouse->model;
+	abs_dev->dev.parent = &psmouse->ps2dev.serio->dev;
+
+	/* Set absolute device capabilities */
+	input_set_capability(abs_dev, EV_KEY, BTN_LEFT);
+	input_set_capability(abs_dev, EV_KEY, BTN_RIGHT);
+	input_set_capability(abs_dev, EV_KEY, BTN_MIDDLE);
+	input_set_capability(abs_dev, EV_ABS, ABS_X);
+	input_set_capability(abs_dev, EV_ABS, ABS_Y);
+	input_set_abs_params(abs_dev, ABS_X, 0, VMMOUSE_MAX_X, 0, 0);
+	input_set_abs_params(abs_dev, ABS_Y, 0, VMMOUSE_MAX_Y, 0, 0);
+
+	error = input_register_device(priv->abs_dev);
+	if (error)
+		goto init_fail;
+
+	/* Add wheel capability to the relative device */
+	input_set_capability(rel_dev, EV_REL, REL_WHEEL);
+
+	psmouse->protocol_handler = vmmouse_process_byte;
+	psmouse->disconnect = vmmouse_disconnect;
+	psmouse->reconnect = vmmouse_reconnect;
+	psmouse->cleanup = vmmouse_reset;
+
+	return 0;
+
+init_fail:
+	vmmouse_disable(psmouse);
+	psmouse_reset(psmouse);
+	input_free_device(abs_dev);
+	kfree(priv);
+	psmouse->private = NULL;
+
+	return error;
+}