From 6e93ef8b6884172a36728d0a3018b406541f34af Mon Sep 17 00:00:00 2001 From: Oak Zeng Date: Tue, 15 Sep 2020 14:47:30 -0500 Subject: 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: Oak Zeng Reviewed-by: Christian Konig Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h index 11c6977c0b35..f1a21e110610 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h @@ -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; -- cgit v1.2.3