Commit b98f1b9e authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

drm/amdgpu: align GTT start to 4GB v2 



For VCE to work properly the start of the GTT space must be aligned to a
4GB boundary.

v2: add comment why we do this

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 3d647c8f

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

+4 −1
Original line number Diff line number Diff line
@@ -622,7 +622,10 @@ void amdgpu_gart_location(struct amdgpu_device *adev, struct amdgpu_mc *mc) 
			dev_warn(adev->dev, "limiting GTT\n");

			mc->gart_size = size_af;

		}

		mc->gart_start = mc->vram_end + 1;

		/* VCE doesn't like it when BOs cross a 4GB segment, so align

		 * the GART base on a 4GB boundary as well.

		 */

		mc->gart_start = ALIGN(mc->vram_end + 1, 0x100000000ULL);

	}

	mc->gart_end = mc->gart_start + mc->gart_size - 1;

	dev_info(adev->dev, "GTT: %lluM 0x%016llX - 0x%016llX\n",

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