[PATCH] drm/amdgpu: Fix vram recover doesn't work after whole GPU reset

[Christian König]

Am 05.05.23 um 05:46 schrieb Lin.Cao:
> v1: Vmbo->shadow is used to back vram bo up when vram lost. So that we
> should set shadow as vmbo->shadow to recover vmbo->bo
> v2: Modify if(vmbo->shadow) shadow = vmbo->shadow as if(!vmbo->shadow)
> continue;
>
> Fix: 'commit e18aaea733da ("drm/amdgpu: move shadow_list to amdgpu_bo_vm")'
> Signed-off-by: Lin.Cao <lincao12 at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 750eaffa81ba..0581b4fec001 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4514,7 +4514,12 @@ static int amdgpu_device_recover_vram(struct amdgpu_device *adev)
>   	dev_info(adev->dev, "recover vram bo from shadow start\n");
>   	mutex_lock(&adev->shadow_list_lock);
>   	list_for_each_entry(vmbo, &adev->shadow_list, shadow_list) {
> -		shadow = &vmbo->bo;
> +
> +		/* If vm is compute context or adev is APU, shadow will be NULL */
> +		if (!vmbo->shadow)
> +			continue;
> +		shadow = vmbo->shadow;
> +
>   		/* No need to recover an evicted BO */
>   		if (shadow->tbo.resource->mem_type != TTM_PL_TT ||
>   		    shadow->tbo.resource->start == AMDGPU_BO_INVALID_OFFSET ||