drm/amdgpu: Check extended configuration space register when system uses large bar

[ 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>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 4be8d2ca50f3a7f1f34829e624c0347045831578..387538f0ca54b3e8e541008fa213e912043d5a7a 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1202,6 +1202,10 @@ 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))