[PATCH 094/159] drm/amdgpu: set snoop bit in pde/pte entries for Aldebaran A+A

[Alex Deucher]

From: Eric Huang <jinhuieric.huang at amd.com>

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: Eric Huang <jinhuieric.huang at amd.com>
Reviewed-by: Oak Zeng <Oak.Zeng at amd.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 95d9ed411520..3a2a922c6c1b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1538,6 +1538,9 @@ uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_resource *mem)
 			flags |= AMDGPU_PTE_SNOOPED;
 	}
 
+	if (mem && mem->placement & TTM_PL_FLAG_CACHED)
+		flags |= AMDGPU_PTE_SNOOPED;
+
 	return flags;
 }
 
-- 
2.29.2