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drm/amdgpu: add rebar parameter

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Add a new parameter to disable BAR resizing.  Note that this
only disables the driver from attempting to resize the BAR,
The BIOS may have resized the BAR at boot.

Some teams have found this useful in debugging P2P DMA
issues on systems where the available MMIO space did not allow
for all of the GPUs present to resize their BARs.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2025-02-27 12:31:28 -05:00
parent b71b7cd91c
commit 48b733d99b
3 changed files with 15 additions and 0 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -1680,6 +1680,9 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
if (amdgpu_sriov_vf(adev))
return 0;
if (!amdgpu_rebar)
return 0;
/* resizing on Dell G5 SE platforms causes problems with runtime pm */
if ((amdgpu_runtime_pm != 0) &&
adev->pdev->vendor == PCI_VENDOR_ID_ATI &&