From: Jingwen Chen Jingwen.Chen2@amd.com
[ Upstream commit 64dcf2f01d59cf9fad19b1a387bd39736a8f4d69 ]
[Why] when vram lost happened in guest, try to write vram can lead to kernel stuck.
[How] When the readback data is invalid, don't do write work, directly reschedule a new work.
Signed-off-by: Jingwen Chen Jingwen.Chen2@amd.com Reviewed-by: Monk Liumonk.liu@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c index 2d51b7694d1fd..572153d08ad11 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c @@ -560,10 +560,14 @@ static int amdgpu_virt_write_vf2pf_data(struct amdgpu_device *adev) static void amdgpu_virt_update_vf2pf_work_item(struct work_struct *work) { struct amdgpu_device *adev = container_of(work, struct amdgpu_device, virt.vf2pf_work.work); + int ret;
- amdgpu_virt_read_pf2vf_data(adev); + ret = amdgpu_virt_read_pf2vf_data(adev); + if (ret) + goto out; amdgpu_virt_write_vf2pf_data(adev);
+out: schedule_delayed_work(&(adev->virt.vf2pf_work), adev->virt.vf2pf_update_interval_ms); }