5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Yifan Zha <Yifan.Zha@xxxxxxx>
[ Upstream commit 33f23fc3155b13c4a96d94a0a22dc26db767440b ]
[Why]
If VF request full GPU access and the request failed,
the VF driver can get stuck accessing registers for an extended period during
the unload of KMS.
[How]
Set no_hw_access flag when VF request for full GPU access fails
This prevents further hardware access attempts, avoiding the prolonged
stuck state.
Signed-off-by: Yifan Zha <Yifan.Zha@xxxxxxx>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 76fc0e8dcf9c..59007024aafe 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -122,8 +122,10 @@ int amdgpu_virt_request_full_gpu(struct amdgpu_device *adev, bool init)
if (virt->ops && virt->ops->req_full_gpu) {
r = virt->ops->req_full_gpu(adev, init);
- if (r)
+ if (r) {
+ adev->no_hw_access = true;
return r;
+ }
adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
}
--
2.43.0
