[PATCH] drm/amdgpu: don't do resets on APUs which don't support it

[Lazar, Lijo]

Hi Alex,

What about something like this?

bool amdgpu_device_reset_on_suspend(struct amdgpu_device *adev)
{
         if (adev->in_s0ix || adev->gmc.xgmi.num_physical_nodes > 1)
                 return false;

         switch (amdgpu_asic_reset_method(adev)) {
         case AMD_RESET_METHOD_BACO:
         case AMD_RESET_METHOD_MODE1:
         case AMD_RESET_METHOD_MODE2:
                 return true;
         }

         return false;
}

Thanks,
Lijo

On 1/13/2022 9:31 AM, Alex Deucher wrote:
> It can cause a hang.  This is normally not enabled for GPU
> hangs on these asics, but was recently enabled for handling
> aborted suspends.  This causes hangs on some platforms
> on suspend.
> 
> Fixes: daf8de0874ab5b ("drm/amdgpu: always reset the asic in suspend (v2)")
> Cc: stable at vger.kernel.org
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1858
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/cik.c | 4 ++++
>   drivers/gpu/drm/amd/amdgpu/vi.c  | 4 ++++
>   2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
> index 54f28c075f21..f10ce740a29c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/cik.c
> +++ b/drivers/gpu/drm/amd/amdgpu/cik.c
> @@ -1428,6 +1428,10 @@ static int cik_asic_reset(struct amdgpu_device *adev)
>   {
>   	int r;
>   
> +	/* APUs don't have full asic reset */
> +	if (adev->flags & AMD_IS_APU)
> +		return 0;
> +
>   	if (cik_asic_reset_method(adev) == AMD_RESET_METHOD_BACO) {
>   		dev_info(adev->dev, "BACO reset\n");
>   		r = amdgpu_dpm_baco_reset(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
> index fe9a7cc8d9eb..6645ebbd2696 100644
> --- a/drivers/gpu/drm/amd/amdgpu/vi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/vi.c
> @@ -956,6 +956,10 @@ static int vi_asic_reset(struct amdgpu_device *adev)
>   {
>   	int r;
>   
> +	/* APUs don't have full asic reset */
> +	if (adev->flags & AMD_IS_APU)
> +		return 0;
> +
>   	if (vi_asic_reset_method(adev) == AMD_RESET_METHOD_BACO) {
>   		dev_info(adev->dev, "BACO reset\n");
>   		r = amdgpu_dpm_baco_reset(adev);
>