From f39093059b2f2998198ab1f7a4e0a92e177f0d66 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20K=C3=B6nig?= Date: Fri, 4 Nov 2016 13:23:41 +0100 Subject: [PATCH] drm/amdgpu: access stolen VRAM directly on KV/KB (v2) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Michel Dänzer Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c index 273b16fb9459..8d05e0c4e3d7 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c @@ -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;