forked from Minki/linux
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: Christian König <christian.koenig@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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@ -375,9 +375,16 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
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/* size in MB on si */
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adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
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adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
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adev->mc.visible_vram_size = adev->mc.aper_size;
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#ifdef CONFIG_X86_64
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if (adev->flags & AMD_IS_APU) {
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adev->mc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) << 22;
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adev->mc.aper_size = adev->mc.real_vram_size;
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}
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#endif
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/* In case the PCI BAR is larger than the actual amount of vram */
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adev->mc.visible_vram_size = adev->mc.aper_size;
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if (adev->mc.visible_vram_size > adev->mc.real_vram_size)
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adev->mc.visible_vram_size = adev->mc.real_vram_size;
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