drm/ttm: use caching instead of placement for ttm_io_prot

Instead of the placement flags use the caching of the bus
mapping or tt object for the page protection flags.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patchwork.freedesktop.org/patch/394255/

drivers/gpu/drm/ttm/ttm_bo_util.c

@@ -279,13 +279,11 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 	for (i = 0; i < new_mem->num_pages; ++i) {
 		page = i * dir + add;
 		if (old_iomap == NULL) {
-			pgprot_t prot = ttm_io_prot(old_mem->placement,
-						    PAGE_KERNEL);
+			pgprot_t prot = ttm_io_prot(bo, old_mem, PAGE_KERNEL);
 			ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
 						   prot);
 		} else if (new_iomap == NULL) {
-			pgprot_t prot = ttm_io_prot(new_mem->placement,
-						    PAGE_KERNEL);
+			pgprot_t prot = ttm_io_prot(bo, new_mem, PAGE_KERNEL);
 			ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
 						   prot);
 		} else {
@@ -384,21 +382,28 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 	return 0;
 }
 
-pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
+pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
+		     pgprot_t tmp)
 {
+	struct ttm_resource_manager *man;
+	enum ttm_caching caching;
+
+	man = ttm_manager_type(bo->bdev, res->mem_type);
+	caching = man->use_tt ? bo->ttm->caching : res->bus.caching;
+
 	/* Cached mappings need no adjustment */
-	if (caching_flags & TTM_PL_FLAG_CACHED)
+	if (caching == ttm_cached)
 		return tmp;
 
 #if defined(__i386__) || defined(__x86_64__)
-	if (caching_flags & TTM_PL_FLAG_WC)
+	if (caching == ttm_write_combined)
 		tmp = pgprot_writecombine(tmp);
 	else if (boot_cpu_data.x86 > 3)
 		tmp = pgprot_noncached(tmp);
 #endif
 #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
     defined(__powerpc__) || defined(__mips__)
-	if (caching_flags & TTM_PL_FLAG_WC)
+	if (caching == ttm_write_combined)
 		tmp = pgprot_writecombine(tmp);
 	else
 		tmp = pgprot_noncached(tmp);
@@ -466,7 +471,7 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 		 * We need to use vmap to get the desired page protection
 		 * or to make the buffer object look contiguous.
 		 */
-		prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
+		prot = ttm_io_prot(bo, mem, PAGE_KERNEL);
 		map->bo_kmap_type = ttm_bo_map_vmap;
 		map->virtual = vmap(ttm->pages + start_page, num_pages,
 				    0, prot);

drivers/gpu/drm/ttm/ttm_bo_vm.c

@@ -310,7 +310,7 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
 	if (unlikely(page_offset >= bo->num_pages))
 		return VM_FAULT_SIGBUS;
 
-	prot = ttm_io_prot(bo->mem.placement, prot);
+	prot = ttm_io_prot(bo, &bo->mem, prot);
 	if (!bo->mem.bus.is_iomem) {
 		struct ttm_operation_ctx ctx = {
 			.interruptible = false,

drivers/gpu/drm/vmwgfx/vmwgfx_blit.c

@@ -484,8 +484,8 @@ int vmw_bo_cpu_blit(struct ttm_buffer_object *dst,
 	d.src_pages = src->ttm->pages;
 	d.dst_num_pages = dst->num_pages;
 	d.src_num_pages = src->num_pages;
-	d.dst_prot = ttm_io_prot(dst->mem.placement, PAGE_KERNEL);
-	d.src_prot = ttm_io_prot(src->mem.placement, PAGE_KERNEL);
+	d.dst_prot = ttm_io_prot(dst, &dst->mem, PAGE_KERNEL);
+	d.src_prot = ttm_io_prot(src, &src->mem, PAGE_KERNEL);
 	d.diff = diff;
 
 	for (j = 0; j < h; ++j) {

include/drm/ttm/ttm_bo_driver.h

@@ -657,13 +657,15 @@ int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
 /**
  * ttm_io_prot
  *
- * @c_state: Caching state.
+ * bo: ttm buffer object
+ * res: ttm resource object
  * @tmp: Page protection flag for a normal, cached mapping.
  *
  * Utility function that returns the pgprot_t that should be used for
  * setting up a PTE with the caching model indicated by @c_state.
  */
-pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp);
+pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
+		     pgprot_t tmp);
 
 /**
  * ttm_bo_tt_bind