[PATCH 3/4] drm/amdgpu: Support snooped PTE flag

[Kuehling, Felix]

From: Oak Zeng <Oak.Zeng at amd.com>

Set snooped PTE flag according to mapping flag. Write request to a
page with snooped bit set, will send out invalidate probe request
to TCC of the remote GPU where the vram page resides.

Change-Id: I799f68ec7a5a1abf32075f5ef31051641a0b3736
Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 9aafcda6c488..8a7c4ec69ae8 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -604,6 +604,9 @@ static uint64_t gmc_v9_0_get_vm_pte_flags(struct amdgpu_device *adev,
 	if (flags & AMDGPU_VM_PAGE_PRT)
 		pte_flag |= AMDGPU_PTE_PRT;
 
+	if (flags & AMDGPU_VM_PAGE_INVALIDATE_PROBE)
+		pte_flag |= AMDGPU_PTE_SNOOPED;
+
 	return pte_flag;
 }
 
-- 
2.17.1