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drm/amdgpu: access stolen VRAM directly on CZ (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>
This commit is contained in:
Christian König 2016-11-07 10:19:40 +01:00 committed by Alex Deucher
parent f39093059b
commit 999446a786
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
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@ -467,9 +467,16 @@ static int gmc_v8_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;