Commit 2e2f197f authored by Eric Huang's avatar Eric Huang Committed by Alex Deucher
Browse files

drm/amdgpu: set snoop bit in pde/pte entries for A+A 



Page tables in vram mapping to cpu is changed from uncached to
cached in A+A, the snoop bit in VM_CONTEXTx_PAGE_TABLE_BASE_ADDR/
PDE0s/PDE1s/PDE2s/PTE.TFs has to be set so gpuvm walker snoop
page table data out of CPU cache.

Signed-off-by: default avatarEric Huang <jinhuieric.huang@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 06bfc045

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

+4 −0
Original line number Diff line number Diff line
@@ -1432,6 +1432,10 @@ uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_resource *mem) 
			flags |= AMDGPU_PTE_SNOOPED;

	}



	if (mem && mem->mem_type == TTM_PL_VRAM &&

			mem->bus.caching == ttm_cached)

		flags |= AMDGPU_PTE_SNOOPED;



	return flags;

}