drm/amdgpu: remove AMDGPU_GEM_CREATE_CPU_GTT_UC

This flag isn't used by user mode drivers, remove it to avoid
confusion. And rename GTT_WC to GTT_USWC to make it clear.
Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -132,10 +132,7 @@ void amdgpu_ttm_placement_from_domain(struct amdgpu_bo *rbo, u32 domain)
 	}
 
 	if (domain & AMDGPU_GEM_DOMAIN_GTT) {
-		if (rbo->flags & AMDGPU_GEM_CREATE_CPU_GTT_UC) {
-			rbo->placements[c].fpfn = 0;
-			rbo->placements[c++].flags = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_TT;
-		} else if (rbo->flags & AMDGPU_GEM_CREATE_CPU_GTT_WC) {
+		if (rbo->flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC) {
 			rbo->placements[c].fpfn = 0;
 			rbo->placements[c++].flags = TTM_PL_FLAG_WC | TTM_PL_FLAG_TT |
 										 TTM_PL_FLAG_UNCACHED;
@@ -146,10 +143,7 @@ void amdgpu_ttm_placement_from_domain(struct amdgpu_bo *rbo, u32 domain)
 	}
 
 	if (domain & AMDGPU_GEM_DOMAIN_CPU) {
-		if (rbo->flags & AMDGPU_GEM_CREATE_CPU_GTT_UC) {
-			rbo->placements[c].fpfn = 0;
-			rbo->placements[c++].flags =  TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_SYSTEM;
-		} else if (rbo->flags & AMDGPU_GEM_CREATE_CPU_GTT_WC) {
+		if (rbo->flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC) {
 			rbo->placements[c].fpfn = 0;
 			rbo->placements[c++].flags = TTM_PL_FLAG_WC | TTM_PL_FLAG_SYSTEM |
 										 TTM_PL_FLAG_UNCACHED;

include/uapi/drm/amdgpu_drm.h

@@ -73,15 +73,12 @@
 #define AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED	(1 << 0)
 /* Flag that CPU access will not work, this VRAM domain is invisible */
 #define AMDGPU_GEM_CREATE_NO_CPU_ACCESS		(1 << 1)
-/* Flag that un-cached attributes should be used for GTT */
-#define AMDGPU_GEM_CREATE_CPU_GTT_UC		(1 << 2)
 /* Flag that USWC attributes should be used for GTT */
-#define AMDGPU_GEM_CREATE_CPU_GTT_WC		(1 << 3)
+#define AMDGPU_GEM_CREATE_CPU_GTT_USWC		(1 << 2)
 
 /* Flag mask for GTT domain_flags */
 #define AMDGPU_GEM_CREATE_CPU_GTT_MASK \
-	(AMDGPU_GEM_CREATE_CPU_GTT_WC | \
-	 AMDGPU_GEM_CREATE_CPU_GTT_UC | \
+	(AMDGPU_GEM_CREATE_CPU_GTT_USWC | \
 	 AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED | \
 	 AMDGPU_GEM_CREATE_NO_CPU_ACCESS)