[PATCH] drm/amdgpu/virt: skip VM fault handler for VF

[Zhang, Jerry]

Maybe we can get the some useful info from IV entry.

Regards,
Jerry (Junwei Zhang)

Linux Base Graphics
SRDC Software Development
_____________________________________


> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf Of
> Pixel Ding
> Sent: Tuesday, February 07, 2017 13:49
> To: Zhou, David(ChunMing); Koenig, Christian
> Cc: Ding, Pixel; amd-gfx at lists.freedesktop.org
> Subject: [PATCH] drm/amdgpu/virt: skip VM fault handler for VF
> 
> VF uses KIQ to access registers. When VM fault occurs, the driver can't get back
> the fence of KIQ submission and runs into CPU soft lockup.
> 
> Signed-off-by: Pixel Ding <Pixel.Ding at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> index 7669b32..ff4fb37 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> @@ -1237,6 +1237,11 @@ static int gmc_v8_0_process_interrupt(struct
> amdgpu_device *adev,  {
>  	u32 addr, status, mc_client;
> 
> +	if (amdgpu_sriov_vf(adev)) {
> +		dev_err(adev->dev, "GPU fault detected on VF, can't access VM
> registers\n");
> +		return 0;
> +	}
> +
>  	addr = RREG32(mmVM_CONTEXT1_PROTECTION_FAULT_ADDR);
>  	status = RREG32(mmVM_CONTEXT1_PROTECTION_FAULT_STATUS);
>  	mc_client =
> RREG32(mmVM_CONTEXT1_PROTECTION_FAULT_MCCLIENT);
> --
> 2.7.4
> 
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