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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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1
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -266,6 +266,7 @@ extern int amdgpu_umsch_mm_fwlog;
extern int amdgpu_user_partt_mode;
extern int amdgpu_agp;
extern int amdgpu_rebar;
extern int amdgpu_wbrf;

3
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@ -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 &&

11
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
View File

@ -238,6 +238,7 @@ int amdgpu_agp = -1; /* auto */
int amdgpu_wbrf = -1;
int amdgpu_damage_clips = -1; /* auto */
int amdgpu_umsch_mm_fwlog;
int amdgpu_rebar = -1; /* auto */
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
@ -1096,6 +1097,16 @@ MODULE_PARM_DESC(wbrf,
"Enable Wifi RFI interference mitigation (0 = disabled, 1 = enabled, -1 = auto(default)");
module_param_named(wbrf, amdgpu_wbrf, int, 0444);
/**
* DOC: rebar (int)
* Allow BAR resizing. Disable this to prevent the driver from attempting
* to resize the BAR if the GPU supports it and there is available MMIO space.
* Note that this just prevents the driver from resizing the BAR. The BIOS
* may have already resized the BAR at boot time.
*/
MODULE_PARM_DESC(rebar, "Resizable BAR (-1 = auto (default), 0 = disable, 1 = enable)");
module_param_named(rebar, amdgpu_rebar, int, 0444);
/* These devices are not supported by amdgpu.
* They are supported by the mach64, r128, radeon drivers
*/