[PATCH] drm/amdgpu: skip pci_restore_state under sriov during device init

[Victor Zhao]

during device init, under sriov, pci_restore_state happens after
fullaccess released, and it can have race condition with mmio protection
enable from host side.

Since msix was toggled during pci_restore_state, if mmio protection
happens during this time, guest side msix will not be properly
programmed and leading to missing interrupts.

So skip pci_restore_state during device init.

Signed-off-by: Victor Zhao <Victor.Zhao at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 6c0ff1c2ae4c..52803cd91ef5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4524,7 +4524,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 		dev_err(adev->dev, "amdgpu_pmu_init failed\n");
 
 	/* Have stored pci confspace at hand for restore in sudden PCI error */
-	if (amdgpu_device_cache_pci_state(adev->pdev))
+	if (!amdgpu_sriov_vf(adev) && amdgpu_device_cache_pci_state(adev->pdev))
 		pci_restore_state(pdev);
 
 	/* if we have > 1 VGA cards, then disable the amdgpu VGA resources */
-- 
2.34.1