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drm/amdgpu: restrict BAR0 fallback read to SR-IOV VFs only

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The BAR0 fallback read path was introduced as a workaround for SR-IOV VFs
where the VRAM aperture is not available during early init. Restrict this
workaround to only SR-IOV VFs where it's needed.

Reported-by: gloveless@jqluv.com
Fixes: cba4928cdf ("drm/amdgpu: reduce early full GPU access during SR-IOV init")
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patch.msgid.link/20260826185102.2269511-1-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit d8a0affd207c813bd063fa2c27786f449eaf92b8)
This commit is contained in:
Mario Limonciello 2026-08-26 13:51:02 -05:00 committed by Alex Deucher
parent 94e25cb6ab
commit bd1f08246b
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -771,6 +771,9 @@ static int amdgpu_device_read_fb_via_bar0(struct amdgpu_device *adev,
if (!buf || !size)
return -EINVAL;
if (!amdgpu_sriov_vf(adev))
return -EINVAL;
flags = pci_resource_flags(adev->pdev, 0);
if ((flags & IORESOURCE_UNSET) || !(flags & IORESOURCE_MEM))
return -EINVAL;