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>

1 files changed, 8 insertions, 1 deletions

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;