Re: [PATCH v2] drm/amdgpu: Skip the coredump collection on reset during driver reload

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On 4/17/2024 1:06 PM, Khatri, Sunil wrote:
devcoredump is used to debug gpu hangs/resets. So in normal process when there is a hang due to ring timeout or page fault we are doing a hard reset as soft reset fail in those cases. How are we making sure that the devcoredump is triggered in those cases and captured?

Sunil Khatri

On 4/17/2024 9:43 AM, Ahmad Rehman wrote:
In passthrough environment, the driver triggers the mode-1 reset on
reload. The reset causes the core dump collection which is delayed task
and prevents driver from unloading until it is completed. Since we do
not need to collect data on "reset on reload" case, we can skip core
dump collection.

v2: Use the same flag to avoid calling amdgpu_reset_reg_dumps as well.

Signed-off-by: Ahmad Rehman <Ahmad.Rehman@xxxxxxx>
  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 +++++--
  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    | 1 +
  drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h  | 1 +
  3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 1b2e177bc2d6..c718982cffa8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5357,7 +5357,9 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
      /* Try reset handler method first */
      tmp_adev = list_first_entry(device_list_handle, struct amdgpu_device,
-    amdgpu_reset_reg_dumps(tmp_adev);
+    if (!test_bit(AMDGPU_SKIP_COREDUMP, &reset_context->flags))
+        amdgpu_reset_reg_dumps(tmp_adev);
        reset_context->reset_device_list = device_list_handle;
      r = amdgpu_reset_perform_reset(tmp_adev, reset_context);
@@ -5430,7 +5432,8 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
                    vram_lost = amdgpu_device_check_vram_lost(tmp_adev);
  -                amdgpu_coredump(tmp_adev, vram_lost, reset_context);
+                if (!test_bit(AMDGPU_SKIP_COREDUMP, &reset_context->flags)) +                    amdgpu_coredump(tmp_adev, vram_lost, reset_context);
                    if (vram_lost) {
                      DRM_INFO("VRAM is lost due to GPU reset!\n");
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 6ea893ad9a36..c512f70b8272 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2481,6 +2481,7 @@ static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work)         /* Use a common context, just need to make sure full reset is done */
      set_bit(AMDGPU_SKIP_HW_RESET, &reset_context.flags);
+    set_bit(AMDGPU_SKIP_COREDUMP, &reset_context.flags);
If this is used for guests only can we better have a flag like amdgpu_sriov_vf  for setting the skip coredump flag ??

Sunil khatri

      r = amdgpu_do_asic_reset(&device_list, &reset_context);
        if (r) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
index 66125d43cf21..b11d190ece53 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
@@ -32,6 +32,7 @@ enum AMDGPU_RESET_FLAGS {
    struct amdgpu_reset_context {

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