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

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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;