Commit f3909305 authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

drm/amdgpu: access stolen VRAM directly on KV/KB (v2) 



We don't need to use the PCI BAR on APUs. This allows us to access
the full VRAM directly without being limited by the BAR size.

v2: squash in 64bit shift fix

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 8485b5e1

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

+8 −1
Original line number Diff line number Diff line
@@ -375,9 +375,16 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev) 
	/* size in MB on si */

	adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;

	adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;

	adev->mc.visible_vram_size = adev->mc.aper_size;



#ifdef CONFIG_X86_64

	if (adev->flags & AMD_IS_APU) {

		adev->mc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) << 22;

		adev->mc.aper_size = adev->mc.real_vram_size;

	}

#endif



	/* In case the PCI BAR is larger than the actual amount of vram */

	adev->mc.visible_vram_size = adev->mc.aper_size;

	if (adev->mc.visible_vram_size > adev->mc.real_vram_size)

		adev->mc.visible_vram_size = adev->mc.real_vram_size;

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