[PATCH AUTOSEL 5.10 25/33] drm/amdgpu: skip amdgpu_device_cache_pci_state under sriov

Sasha Levin
2024-11-24T13:55:06Z

From: Victor Zhao <Victor.Zhao@amd.com>

[ Upstream commit afe260df55ac280cd56306248cb6d8a6b0db095c ]

Under sriov, host driver will save and restore vf pci cfg space during
reset. And 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 leading to missing interrupts.

So skip amdgpu_device_cache_pci_state for sriov.

Signed-off-by: Victor Zhao <Victor.Zhao@amd.com>
Acked-by: Lijo Lazar <lijo.lazar@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_device.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index e833c02fabff3..2f42471e578ad 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5088,6 +5088,9 @@ bool amdgpu_device_cache_pci_state(struct pci_dev *pdev)
struct amdgpu_device *adev = drm_to_adev(dev);
int r;

+ if (amdgpu_sriov_vf(adev))
+ return false;
+
r = pci_save_state(pdev);
if (!r) {
kfree(adev->pci_state);
--
2.43.0