Re: [RFC v2 8/8] drm/amd/virt: Drop concurrent GPU reset protection for SRIOV

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Sure, I guess i can drop this patch then.

Andrey

On 2021-12-24 4:57 a.m., JingWen Chen wrote:
I do agree with shaoyun, if the host find the gpu engine hangs first, and do the flr, guest side thread may not know this and still try to access HW(e.g. kfd is using a lot of amdgpu_in_reset and reset_sem to identify the reset status). And this may lead to very bad result.

On 2021/12/24 下午4:58, Deng, Emily wrote:
These patches look good to me. JingWen will pull these patches and do some basic TDR test on sriov environment, and give feedback.

Best wishes
Emily Deng



-----Original Message-----
From: Liu, Monk <Monk.Liu@xxxxxxx>
Sent: Thursday, December 23, 2021 6:14 PM
To: Koenig, Christian <Christian.Koenig@xxxxxxx>; Grodzovsky, Andrey
<Andrey.Grodzovsky@xxxxxxx>; dri-devel@xxxxxxxxxxxxxxxxxxxxx; amd-
gfx@xxxxxxxxxxxxxxxxxxxxx; Chen, Horace <Horace.Chen@xxxxxxx>; Chen,
JingWen <JingWen.Chen2@xxxxxxx>; Deng, Emily <Emily.Deng@xxxxxxx>
Cc: daniel@xxxxxxxx
Subject: RE: [RFC v2 8/8] drm/amd/virt: Drop concurrent GPU reset protection
for SRIOV

[AMD Official Use Only]

@Chen, Horace @Chen, JingWen @Deng, Emily

Please take a review on Andrey's patch

Thanks
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-----Original Message-----
From: Koenig, Christian <Christian.Koenig@xxxxxxx>
Sent: Thursday, December 23, 2021 4:42 PM
To: Grodzovsky, Andrey <Andrey.Grodzovsky@xxxxxxx>; dri-
devel@xxxxxxxxxxxxxxxxxxxxx; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: daniel@xxxxxxxx; Liu, Monk <Monk.Liu@xxxxxxx>; Chen, Horace
<Horace.Chen@xxxxxxx>
Subject: Re: [RFC v2 8/8] drm/amd/virt: Drop concurrent GPU reset protection
for SRIOV

Am 22.12.21 um 23:14 schrieb Andrey Grodzovsky:
Since now flr work is serialized against  GPU resets there is no need
for this.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
Acked-by: Christian König <christian.koenig@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) ||



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