5.4-stable review patch. If anyone has any objections, please let me know.
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From: Ma Jun Jun.Ma2@amd.com
[ Upstream commit e372baeb3d336b20fd9463784c577fd8824497cd ]
Some customer platforms do not enable mmconfig for various reasons, such as bios bug, and therefore cannot access the GPU extend configuration space through mmio.
When the system enters the d3cold state and resumes, the amdgpu driver fails to resume because the extend configuration space registers of GPU can't be restored. At this point, Usually we only see some failure dmesg log printed by amdgpu driver, it is difficult to find the root cause.
Therefor print a warnning message if the system can't access the extended configuration space register when using large bar.
Signed-off-by: Ma Jun Jun.Ma2@amd.com Reviewed-by: Christian König christian.koenig@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Stable-dep-of: 099bffc7cadf ("drm/amdgpu: disable BAR resize on Dell G5 SE") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 49fcb69ca4a1b..dc8ed896d05f0 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -766,6 +766,10 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev) if (amdgpu_sriov_vf(adev)) return 0;
+ /* PCI_EXT_CAP_ID_VNDR extended capability is located at 0x100 */ + if (!pci_find_ext_capability(adev->pdev, PCI_EXT_CAP_ID_VNDR)) + DRM_WARN("System can't access extended configuration space,please check!!\n"); + /* skip if the bios has already enabled large BAR */ if (adev->gmc.real_vram_size && (pci_resource_len(adev->pdev, 0) >= adev->gmc.real_vram_size))