drm/amdgpu: Update the impelmentation of AMDGPU_PTE_MTYPE_GFX12

This patch changes the implementation of AMDGPU_PTE_MTYPE_GFX12,
clear the bits before setting the new one.
This fixed the potential issue that GFX12 setting memory to NC.

v2: Clear mtype field before setting the new one (Alex)
v3: Fix typo (Felix)
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: longlyao <Longlong.Yao@amd.com>
Signed-off-by: Shane Xiao <shane.xiao@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h

@@ -116,8 +116,11 @@ struct amdgpu_mem_stats;
 #define AMDGPU_PTE_PRT_FLAG(adev)	\
 	((amdgpu_ip_version((adev), GC_HWIP, 0) >= IP_VERSION(12, 0, 0)) ? AMDGPU_PTE_PRT_GFX12 : AMDGPU_PTE_PRT)
 
-#define AMDGPU_PTE_MTYPE_GFX12(a)	((uint64_t)(a) << 54)
-#define AMDGPU_PTE_MTYPE_GFX12_MASK	AMDGPU_PTE_MTYPE_GFX12(3ULL)
+#define AMDGPU_PTE_MTYPE_GFX12_SHIFT(mtype)	((uint64_t)(mtype) << 54)
+#define AMDGPU_PTE_MTYPE_GFX12_MASK	AMDGPU_PTE_MTYPE_GFX12_SHIFT(3ULL)
+#define AMDGPU_PTE_MTYPE_GFX12(flags, mtype)				\
+	(((uint64_t)(flags) & (~AMDGPU_PTE_MTYPE_GFX12_MASK)) |	\
+	  AMDGPU_PTE_MTYPE_GFX12_SHIFT(mtype))
 
 #define AMDGPU_PTE_IS_PTE		(1ULL << 63)
 

drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c

@@ -461,17 +461,17 @@ static uint64_t gmc_v12_0_map_mtype(struct amdgpu_device *adev, uint32_t flags)
 {
 	switch (flags) {
 	case AMDGPU_VM_MTYPE_DEFAULT:
-		return AMDGPU_PTE_MTYPE_GFX12(MTYPE_NC);
+		return AMDGPU_PTE_MTYPE_GFX12(0ULL, MTYPE_NC);
 	case AMDGPU_VM_MTYPE_NC:
-		return AMDGPU_PTE_MTYPE_GFX12(MTYPE_NC);
+		return AMDGPU_PTE_MTYPE_GFX12(0ULL, MTYPE_NC);
 	case AMDGPU_VM_MTYPE_WC:
-		return AMDGPU_PTE_MTYPE_GFX12(MTYPE_WC);
+		return AMDGPU_PTE_MTYPE_GFX12(0ULL, MTYPE_WC);
 	case AMDGPU_VM_MTYPE_CC:
-		return AMDGPU_PTE_MTYPE_GFX12(MTYPE_CC);
+		return AMDGPU_PTE_MTYPE_GFX12(0ULL, MTYPE_CC);
 	case AMDGPU_VM_MTYPE_UC:
-		return AMDGPU_PTE_MTYPE_GFX12(MTYPE_UC);
+		return AMDGPU_PTE_MTYPE_GFX12(0ULL, MTYPE_UC);
 	default:
-		return AMDGPU_PTE_MTYPE_GFX12(MTYPE_NC);
+		return AMDGPU_PTE_MTYPE_GFX12(0ULL, MTYPE_NC);
 	}
 }
 
@@ -524,8 +524,7 @@ static void gmc_v12_0_get_vm_pte(struct amdgpu_device *adev,
 
 	if (bo->flags & (AMDGPU_GEM_CREATE_COHERENT |
 			       AMDGPU_GEM_CREATE_UNCACHED))
-		*flags = (*flags & ~AMDGPU_PTE_MTYPE_GFX12_MASK) |
-			 AMDGPU_PTE_MTYPE_GFX12(MTYPE_UC);
+		*flags = AMDGPU_PTE_MTYPE_GFX12(*flags, MTYPE_UC);
 
 	bo_adev = amdgpu_ttm_adev(bo->tbo.bdev);
 	coherent = bo->flags & AMDGPU_GEM_CREATE_COHERENT;
@@ -534,7 +533,7 @@ static void gmc_v12_0_get_vm_pte(struct amdgpu_device *adev,
 
 	/* WA for HW bug */
 	if (is_system || ((bo_adev != adev) && coherent))
-		*flags |= AMDGPU_PTE_MTYPE_GFX12(MTYPE_NC);
+		*flags = AMDGPU_PTE_MTYPE_GFX12(*flags, MTYPE_NC);
 
 }
 
@@ -707,7 +706,7 @@ static int gmc_v12_0_gart_init(struct amdgpu_device *adev)
 		return r;
 
 	adev->gart.table_size = adev->gart.num_gpu_pages * 8;
-	adev->gart.gart_pte_flags = AMDGPU_PTE_MTYPE_GFX12(MTYPE_UC) |
+	adev->gart.gart_pte_flags = AMDGPU_PTE_MTYPE_GFX12(0ULL, MTYPE_UC) |
 				    AMDGPU_PTE_EXECUTABLE |
 				    AMDGPU_PTE_IS_PTE;