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

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On 3/8/2022 10:00 PM, Sharma, Shashank wrote:
Hello Andrey

On 3/8/2022 5:26 PM, Andrey Grodzovsky wrote:

On 2022-03-07 11:26, Shashank Sharma wrote:
From: Shashank Sharma <shashank.sharma@xxxxxxx>

This patch adds a work function, which will get scheduled
in event of a GPU reset, and will send a uevent to user with
some reset context infomration, like a PID and some flags.


Where is the actual scheduling of the work function ? Shouldn't
there be a patch for that too ?


Yes, Amar is working on that patch, on top of these patches. They should be out soon. I thought it was a good idea to get quick feedback on the basic patches before we build something on top of it.

schedule_work() will be called in the function amdgpu_do_asic_reset ()

after getting vram_lost info:

vram_lost = amdgpu_device_check_vram_lost(tmp_adev);

update  amdgpu_reset_event_ctx and call schedule_work()

Regards,
S.Amarnath
- Shashank

Andrey



The userspace can do some recovery and post-processing work
based on this event.

V2:
- Changed the name of the work to gpu_reset_event_work
   (Christian)
- Added a structure to accommodate some additional information
   (like a PID and some flags)

Cc: Alexander Deucher <alexander.deucher@xxxxxxx>
Cc: Christian Koenig <christian.koenig@xxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  7 +++++++
  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 19 +++++++++++++++++++
  2 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index d8b854fcbffa..7df219fe363f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -813,6 +813,11 @@ struct amd_powerplay {
  #define AMDGPU_RESET_MAGIC_NUM 64
  #define AMDGPU_MAX_DF_PERFMONS 4
  #define AMDGPU_PRODUCT_NAME_LEN 64
+struct amdgpu_reset_event_ctx {
+    uint64_t pid;
+    uint32_t flags;
+};
+
  struct amdgpu_device {
      struct device            *dev;
      struct pci_dev            *pdev;
@@ -1063,6 +1068,7 @@ struct amdgpu_device {
      int asic_reset_res;
      struct work_struct        xgmi_reset_work;
+    struct work_struct        gpu_reset_event_work;
      struct list_head        reset_list;
      long                gfx_timeout;
@@ -1097,6 +1103,7 @@ struct amdgpu_device {
      pci_channel_state_t        pci_channel_state;
      struct amdgpu_reset_control     *reset_cntl;
+    struct amdgpu_reset_event_ctx   reset_event_ctx;
      uint32_t                        ip_versions[MAX_HWIP][HWIP_MAX_INSTANCE];
      bool                ram_is_direct_mapped;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index ed077de426d9..c43d099da06d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -73,6 +73,7 @@
  #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");
@@ -3277,6 +3278,23 @@ bool amdgpu_device_has_dc_support(struct amdgpu_device *adev)
      return amdgpu_device_asic_has_dc_support(adev->asic_type);
  }
+static void amdgpu_device_reset_event_func(struct work_struct *__work)
+{
+    struct amdgpu_device *adev = container_of(__work, struct amdgpu_device,
+                          gpu_reset_event_work);
+    struct amdgpu_reset_event_ctx *event_ctx = &adev->reset_event_ctx;
+
+    /*
+     * A GPU reset has happened, indicate the userspace and pass the
+     * following information:
+     *    - pid of the process involved,
+     *    - if the VRAM is valid or not,
+     *    - indicate that userspace may want to collect the ftrace event
+     * data from the trace event.
+     */
+    drm_sysfs_reset_event(&adev->ddev, event_ctx->pid, event_ctx->flags);
+}
+
  static void amdgpu_device_xgmi_reset_func(struct work_struct *__work)
  {
      struct amdgpu_device *adev =
@@ -3525,6 +3543,7 @@ 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_event_work, amdgpu_device_reset_event_func);
      adev->gfx.gfx_off_req_count = 1;
      adev->pm.ac_power = power_supply_is_system_supplied() > 0;

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