[PATCH 127/159] drm/amdgpu: Use physical translation mode to access page table

[Alex Deucher]

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

On A+A platform, CPU write page directory and page table in cached
mode. So it is necessary for page table walker to snoop CPU cache.
This setting is necessary for page walker to snoop page directory
and page table data out of CPU cache.

Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
Acked-by: Christian Konig <christian.koenig at amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c |  9 +++++++--
 drivers/gpu/drm/amd/amdgpu/mmhub_v1_7.c  | 13 +++++++++++--
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
index 6ddd53ba8b77..c6687c6cf03d 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
@@ -173,8 +173,13 @@ static void gfxhub_v1_0_init_cache_regs(struct amdgpu_device *adev)
 	WREG32_SOC15_RLC(GC, 0, mmVM_L2_CNTL3, tmp);
 
 	tmp = mmVM_L2_CNTL4_DEFAULT;
-	tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PDE_REQUEST_PHYSICAL, 0);
-	tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PTE_REQUEST_PHYSICAL, 0);
+	if (adev->gmc.xgmi.connected_to_cpu) {
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PDE_REQUEST_PHYSICAL, 1);
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PTE_REQUEST_PHYSICAL, 1);
+	} else {
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PDE_REQUEST_PHYSICAL, 0);
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PTE_REQUEST_PHYSICAL, 0);
+	}
 	WREG32_SOC15_RLC(GC, 0, mmVM_L2_CNTL4, tmp);
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_7.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_7.c
index c3f3e755d4b7..08c50ce491e3 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_7.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_7.c
@@ -178,8 +178,17 @@ static void mmhub_v1_7_init_cache_regs(struct amdgpu_device *adev)
 	WREG32_SOC15(MMHUB, 0, regVM_L2_CNTL3, tmp);
 
 	tmp = regVM_L2_CNTL4_DEFAULT;
-	tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PDE_REQUEST_PHYSICAL, 0);
-	tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PTE_REQUEST_PHYSICAL, 0);
+	if (adev->gmc.xgmi.connected_to_cpu) {
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4,
+				    VMC_TAP_PDE_REQUEST_PHYSICAL, 1);
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4,
+				    VMC_TAP_PTE_REQUEST_PHYSICAL, 1);
+	} else {
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4,
+				    VMC_TAP_PDE_REQUEST_PHYSICAL, 0);
+		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4,
+				    VMC_TAP_PTE_REQUEST_PHYSICAL, 0);
+	}
 	WREG32_SOC15(MMHUB, 0, regVM_L2_CNTL4, tmp);
 }
 
-- 
2.29.2