drm/amdgpu/gmc: steal the appropriate amount of vram for fw hand-over (v3)
Steal 9 MB for vga emulation and fb if vga is enabled, otherwise,
steal enough to cover the current display size as set by the vbios.
If no memory is used (e.g., secondary or headless card), skip
stolen memory reserve.
v2: skip reservation if vram is limited, address Christian's comments
v3: squash in fix from Harry
Reviewed-and-Tested-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com> (v2)
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index ab73300..2be04ac 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1441,12 +1441,14 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
return r;
}
- r = amdgpu_bo_create_kernel(adev, adev->gmc.stolen_size, PAGE_SIZE,
- AMDGPU_GEM_DOMAIN_VRAM,
- &adev->stolen_vga_memory,
- NULL, NULL);
- if (r)
- return r;
+ if (adev->gmc.stolen_size) {
+ r = amdgpu_bo_create_kernel(adev, adev->gmc.stolen_size, PAGE_SIZE,
+ AMDGPU_GEM_DOMAIN_VRAM,
+ &adev->stolen_vga_memory,
+ NULL, NULL);
+ if (r)
+ return r;
+ }
DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
(unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));