[AMD Official Use Only] I have a discussion with Andrey about this offline. It seems dangerous to remove the in_gpu_reset and reset_semm directly inside the flr_work. In the case when the reset is triggered from host side , gpu need to be locked while host perform reset after flr_work reply the host with READY_TO_RESET. The original comments seems need to be updated. Regards Shaoyun.liu -----Original Message----- From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Andrey Grodzovsky Sent: Wednesday, December 22, 2021 5:14 PM To: dri-devel@xxxxxxxxxxxxxxxxxxxxx; amd-gfx@xxxxxxxxxxxxxxxxxxxxx Cc: Liu, Monk <Monk.Liu@xxxxxxx>; Grodzovsky, Andrey <Andrey.Grodzovsky@xxxxxxx>; Chen, Horace <Horace.Chen@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; daniel@xxxxxxxx Subject: [RFC v2 8/8] drm/amd/virt: Drop concurrent GPU reset protection for SRIOV Since now flr work is serialized against GPU resets there is no need for this. Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx> --- drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c | 11 ----------- drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c | 11 ----------- 2 files changed, 22 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c index 487cd654b69e..7d59a66e3988 100644 --- a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c +++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c @@ -248,15 +248,7 @@ static void xgpu_ai_mailbox_flr_work(struct work_struct *work) struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt); int timeout = AI_MAILBOX_POLL_FLR_TIMEDOUT; - /* block amdgpu_gpu_recover till msg FLR COMPLETE received, - * otherwise the mailbox msg will be ruined/reseted by - * the VF FLR. - */ - if (!down_write_trylock(&adev->reset_sem)) - return; - amdgpu_virt_fini_data_exchange(adev); - atomic_set(&adev->in_gpu_reset, 1); xgpu_ai_mailbox_trans_msg(adev, IDH_READY_TO_RESET, 0, 0, 0); @@ -269,9 +261,6 @@ static void xgpu_ai_mailbox_flr_work(struct work_struct *work) } while (timeout > 1); flr_done: - atomic_set(&adev->in_gpu_reset, 0); - up_write(&adev->reset_sem); - /* Trigger recovery for world switch failure if no TDR */ if (amdgpu_device_should_recover_gpu(adev) && (!amdgpu_device_has_job_running(adev) || diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c index e3869067a31d..f82c066c8e8d 100644 --- a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c +++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c @@ -277,15 +277,7 @@ static void xgpu_nv_mailbox_flr_work(struct work_struct *work) struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt); int timeout = NV_MAILBOX_POLL_FLR_TIMEDOUT; - /* block amdgpu_gpu_recover till msg FLR COMPLETE received, - * otherwise the mailbox msg will be ruined/reseted by - * the VF FLR. - */ - if (!down_write_trylock(&adev->reset_sem)) - return; - amdgpu_virt_fini_data_exchange(adev); - atomic_set(&adev->in_gpu_reset, 1); xgpu_nv_mailbox_trans_msg(adev, IDH_READY_TO_RESET, 0, 0, 0); @@ -298,9 +290,6 @@ static void xgpu_nv_mailbox_flr_work(struct work_struct *work) } while (timeout > 1); flr_done: - atomic_set(&adev->in_gpu_reset, 0); - up_write(&adev->reset_sem); - /* Trigger recovery for world switch failure if no TDR */ if (amdgpu_device_should_recover_gpu(adev) && (!amdgpu_device_has_job_running(adev) || -- 2.25.1
