drm/amdgpu:fix random missing of FLR NOTIFY

[ Upstream commit 34a4d2bf06b3ab92024b8e26d6049411369d1f1a ]

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
index 2812d88..9b7b013 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
+++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
@@ -276,9 +276,17 @@ 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;