[PATCH 9/9] drm/amdgpu:fix random missing of FLR NOTIFY

[Christian König]

Am 25.10.2017 um 11:22 schrieb Monk Liu:
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>

No idea if this is correct or not, but it looks like an important fix 
which should go into the branch first.

Feel free to add my Acked-by: Christian König <christian.koenig at amd.com>.

Regards,
Christian.

> ---
>   drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c | 14 +++++++++++---
>   1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
> index f8522a0..a43cffb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
> +++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
> @@ -282,9 +282,17 @@ static int xgpu_ai_mailbox_rcv_irq(struct amdgpu_device *adev,
>   		/* see what event we get */
>   		r = xgpu_ai_mailbox_rcv_msg(adev, IDH_FLR_NOTIFICATION);
>   
> -		/* only handle FLR_NOTIFY now */
> -		if (!r)
> -			schedule_work(&adev->virt.flr_work);
> +		/* sometimes the interrupt is delayed to inject to VM, so under such case
> +		 * the IDH_FLR_NOTIFICATION is overwritten by VF FLR from GIM side, thus
> +		 * above recieve message could be failed, we should schedule the flr_work
> +		 * anyway
> +		 */
> +		if (r) {
> +			DRM_ERROR("FLR_NOTIFICATION is missed\n");
> +			xgpu_ai_mailbox_send_ack(adev);
> +		}
> +
> +		schedule_work(&adev->virt.flr_work);
>   	}
>   
>   	return 0;