[PATCH 4/7] drm/amdgpu: Always set snoop bit in PDE on GFX 12.1

[Alex Deucher <alexander.deucher@amd.com>]

From: Mukul Joshi <mukul.joshi@amd.com>

GFX 12.1 has the requirement to always set snoop bit in PDE
to maintain coherency.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Alex Sierra <alex.sierra@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c b/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c
index 347be0ef07ec8..ae08f8b3bfbc1 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c
@@ -249,6 +249,8 @@ static void gmc_v12_1_get_vm_pde(struct amdgpu_device *adev, int level,
 			adev->gmc.vram_start;
 	BUG_ON(*addr & 0xFFFF00000000003FULL);
 
+	*flags |= AMDGPU_PTE_SNOOPED;
+
 	if (!adev->gmc.translate_further)
 		return;
 
-- 
2.51.1