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From: "Chen, Guchun" <>
To: "Grodzovsky, Andrey" <>,
	"" <>,
	"Koenig, Christian" <>,
	"Pan, Xinhui" <>,
	"Deucher, Alexander" <>
Subject: RE: [PATCH] drm/amdgpu: add missed write lock for pci detected state pci_channel_io_normal
Date: Fri, 1 Oct 2021 08:21:25 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>


Hi Andrey,

Do you mean to move the code of drm_sched_resubmit_jobs and drm_sched_start in amdgpu_pci_resume to amdgpu_pci_error_detected, under the case pci_channel_io_frozen?
Then leave amdgpu_pci_resume as a null function, and in this way, we can drop the acquire/lock write lock for case of pci_channel_io_normal as well?


-----Original Message-----
From: Grodzovsky, Andrey <> 
Sent: Friday, October 1, 2021 10:22 AM
To: Chen, Guchun <>;; Koenig, Christian <>; Pan, Xinhui <>; Deucher, Alexander <>
Subject: Re: [PATCH] drm/amdgpu: add missed write lock for pci detected state pci_channel_io_normal

On 2021-09-30 10:00 p.m., Guchun Chen wrote:

> When a PCI error state pci_channel_io_normal is detectd, it will 
> report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI driver 
> will continue the execution of PCI resume callback report_resume by 
> pci_walk_bridge, and the callback will go into amdgpu_pci_resume 
> finally, where write lock is releasd unconditionally without acquiring 
> such lock.

Good catch but, the issue is even wider in scope, what about drm_sched_resubmit_jobs and drm_sched_start called without being stopped before ? Better to put the entire scope of code in this function under flag that set only in pci_channel_io_frozen. As far as i remember we don't need to do anything in case of pci_channel_io_normal.


> Fixes: c9a6b82f45e2("drm/amdgpu: Implement DPC recovery")
> Signed-off-by: Guchun Chen <>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
>   1 file changed, 1 insertion(+)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index bb5ad2b6ca13..12f822d51de2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -5370,6 +5370,7 @@ pci_ers_result_t 
> amdgpu_pci_error_detected(struct pci_dev *pdev, pci_channel_sta
>   	switch (state) {
>   	case pci_channel_io_normal:
> +		amdgpu_device_lock_adev(adev, NULL);
>   	/* Fatal error, prepare for slot reset */
>   	case pci_channel_io_frozen:

  reply	other threads:[~2021-10-01  8:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-01  2:00 [PATCH] drm/amdgpu: add missed write lock for pci detected state pci_channel_io_normal Guchun Chen
2021-10-01  2:21 ` Andrey Grodzovsky
2021-10-01  8:21   ` Chen, Guchun [this message]
2021-10-01 14:28     ` Andrey Grodzovsky
2021-10-01 15:21       ` Chen, Guchun
2021-10-02 15:20         ` Chen, Guchun

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