[PATCH 2/4] drm/amdgpu: add work function for GPU reset

[Sharma, Shashank]

 From c598dd586dd15fc5ae0a883a2e6f4094ec024085 Mon Sep 17 00:00:00 2001
From: Shashank Sharma <shashank.sharma at amd.com>
Date: Fri, 21 Jan 2022 17:33:10 +0100
Subject: [PATCH 2/4] drm/amdgpu: add work function for GPU reset

This patch adds a new work function, which will get scheduled
in event of a GPU reset, and will send a uevent to indicate the same.
The userspace can do some post-processing work like collecting data
from a trace event.

Cc: Alexander Deucher <alexander.deucher at amd.com>
Cc: Christian Koenig <christian.koenig at amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma at amd.com>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  2 ++
  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 14 ++++++++++++++
  2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 269437b01328..79192f43bb71 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1057,6 +1057,8 @@ struct amdgpu_device {
  	struct work_struct		xgmi_reset_work;
  	struct list_head		reset_list;

+	struct work_struct		gpu_reset_work;
+
  	long				gfx_timeout;
  	long				sdma_timeout;
  	long				video_timeout;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index af9bdf16eefd..e29e58240869 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -72,6 +72,7 @@
  #include <linux/pm_runtime.h>

  #include <drm/drm_drv.h>
+#include <drm/drm_sysfs.h>

  MODULE_FIRMWARE("amdgpu/vega10_gpu_info.bin");
  MODULE_FIRMWARE("amdgpu/vega12_gpu_info.bin");
@@ -3274,6 +3275,18 @@ bool amdgpu_device_has_dc_support(struct 
amdgpu_device *adev)
  	return amdgpu_device_asic_has_dc_support(adev->asic_type);
  }

+static void amdgpu_device_gpu_reset_func(struct work_struct *__work)
+{
+	struct amdgpu_device *adev =
+		container_of(__work, struct amdgpu_device, gpu_reset_work);
+
+	/*
+	 * Inform userspace that a GPU reset happened, and it should collect
+	 * data from the trace event.
+	 */
+	drm_sysfs_gpu_reset_event(&adev->ddev);
+}
+
  static void amdgpu_device_xgmi_reset_func(struct work_struct *__work)
  {
  	struct amdgpu_device *adev =
@@ -3506,6 +3519,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
  			  amdgpu_device_delay_enable_gfx_off);

  	INIT_WORK(&adev->xgmi_reset_work, amdgpu_device_xgmi_reset_func);
+	INIT_WORK(&adev->gpu_reset_work, amdgpu_device_gpu_reset_func);

  	adev->gfx.gfx_off_req_count = 1;
  	adev->pm.ac_power = power_supply_is_system_supplied() > 0;
-- 
2.32.0