Commit 6e93ef8b authored by Oak Zeng's avatar Oak Zeng Committed by Alex Deucher
Browse files

drm/amdgpu: Modify comments of vram_start/end 



Modify the comment to reflect the fact that, if
use GART for vram address translation for vmid0,
[vram_start, vram_end] will be placed inside SYSVM
aperture, together with GART.

Signed-off-by: default avatarOak Zeng <Oak.Zeng@amd.com>
Reviewed-by: default avatarChristian Konig <christian.koenig@amd.com>
Reviewed-by: default avatarFelix Kuehling <felix.kuehling@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent f1dc12ca

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h

+7 −4
Original line number Diff line number Diff line
@@ -190,10 +190,13 @@ struct amdgpu_gmc { 
	u64			gart_end;

	/* Frame buffer aperture of this GPU device. Different from

	 * fb_start (see below), this only covers the local GPU device.

	 * Driver get fb_start from MC_VM_FB_LOCATION_BASE (set by vbios)

	 * and calculate vram_start of this local device by adding an

	 * offset inside the XGMI hive.

	 * Under VMID0, logical address == MC address

	 * If use FB aperture to access FB, driver get fb_start from

	 * MC_VM_FB_LOCATION_BASE (set by vbios) and calculate vram_start

	 * of this local device by adding an offset inside the XGMI hive.

	 * If use GART table for VMID0 FB access, driver finds a hole in

	 * VMID0's virtual address space to place the SYSVM aperture inside

	 * which the first part is vram and the second part is gart (covering

	 * sram)

	 */

	u64			vram_start;

	u64			vram_end;