drm/amdkfd: apply uncached flag for aldebaran

The flag is only applied on fine-grained memory.
Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Oak Zeng <Oak.Zeng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -405,6 +405,7 @@ static uint64_t get_pte_flags(struct amdgpu_device *adev, struct kgd_mem *mem)
 {
 	struct amdgpu_device *bo_adev = amdgpu_ttm_adev(mem->bo->tbo.bdev);
 	bool coherent = mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_COHERENT;
+	bool uncached = mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_UNCACHED;
 	uint32_t mapping_flags;
 	uint64_t pte_flags;
 	bool snoop = false;
@@ -429,7 +430,12 @@ static uint64_t get_pte_flags(struct amdgpu_device *adev, struct kgd_mem *mem)
 		}
 		break;
 	case CHIP_ALDEBARAN:
-		if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
+		if (coherent && uncached) {
+			if (adev->gmc.xgmi.connected_to_cpu ||
+				!(mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM))
+				snoop = true;
+			mapping_flags |= AMDGPU_VM_MTYPE_UC;
+		} else if (mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
 			if (bo_adev == adev) {
 				mapping_flags |= AMDGPU_VM_MTYPE_RW;
 				if (adev->gmc.xgmi.connected_to_cpu)