drm/ttm: merge ttm_dma_tt back into ttm_tt

It makes no difference to kmalloc if the structure
is 48 or 64 bytes in size.

Signed-off-by: Christian König <[e-mail]>
Reviewed-by: Dave Airlie <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/396950/

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

···
 			       uint64_t *addr, uint64_t *flags)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
-	struct ttm_dma_tt *ttm;
 
 	switch (bo->tbo.mem.mem_type) {
 	case TTM_PL_TT:
-		ttm = container_of(bo->tbo.ttm, struct ttm_dma_tt, ttm);
-		*addr = ttm->dma_address[0];
+		*addr = bo->tbo.ttm->dma_address[0];
 		break;
 	case TTM_PL_VRAM:
 		*addr = amdgpu_bo_gpu_offset(bo);
···
 uint64_t amdgpu_gmc_agp_addr(struct ttm_buffer_object *bo)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
-	struct ttm_dma_tt *ttm;
 
 	if (bo->num_pages != 1 || bo->ttm->caching == ttm_cached)
 		return AMDGPU_BO_INVALID_OFFSET;
 
-	ttm = container_of(bo->ttm, struct ttm_dma_tt, ttm);
-	if (ttm->dma_address[0] + PAGE_SIZE >= adev->gmc.agp_size)
+	if (bo->ttm->dma_address[0] + PAGE_SIZE >= adev->gmc.agp_size)
 		return AMDGPU_BO_INVALID_OFFSET;
 
-	return adev->gmc.agp_start + ttm->dma_address[0];
+	return adev->gmc.agp_start + bo->ttm->dma_address[0];
 }
 
 /**

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

···
 	cpu_addr = &job->ibs[0].ptr[num_dw];
 
 	if (mem->mem_type == TTM_PL_TT) {
-		struct ttm_dma_tt *dma;
 		dma_addr_t *dma_address;
 
-		dma = container_of(bo->ttm, struct ttm_dma_tt, ttm);
-		dma_address = &dma->dma_address[offset >> PAGE_SHIFT];
+		dma_address = &bo->ttm->dma_address[offset >> PAGE_SHIFT];
 		r = amdgpu_gart_map(adev, 0, num_pages, dma_address, flags,
 				    cpu_addr);
 		if (r)
···
  * TTM backend functions.
  */
 struct amdgpu_ttm_tt {
-	struct ttm_dma_tt	ttm;
+	struct ttm_tt	ttm;
 	struct drm_gem_object	*gobj;
 	u64			offset;
 	uint64_t		userptr;
···
 	r = amdgpu_gart_unbind(adev, gtt->offset, ttm->num_pages);
 	if (r)
 		DRM_ERROR("failed to unbind %u pages at 0x%08llX\n",
-			  gtt->ttm.ttm.num_pages, gtt->offset);
+			  gtt->ttm.num_pages, gtt->offset);
 	gtt->bound = false;
 }
 
···
 	if (gtt->usertask)
 		put_task_struct(gtt->usertask);
 
-	ttm_dma_tt_fini(&gtt->ttm);
+	ttm_tt_fini(&gtt->ttm);
 	kfree(gtt);
 }
 
···
 		kfree(gtt);
 		return NULL;
 	}
-	return &gtt->ttm.ttm;
+	return &gtt->ttm;
 }
 
 /**
···
 	/* Return false if no part of the ttm_tt object lies within
 	 * the range
 	 */
-	size = (unsigned long)gtt->ttm.ttm.num_pages * PAGE_SIZE;
+	size = (unsigned long)gtt->ttm.num_pages * PAGE_SIZE;
 	if (gtt->userptr > end || gtt->userptr + size <= start)
 		return false;
 

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

···
 		resv = vm->root.base.bo->tbo.base.resv;
 	} else {
 		struct drm_gem_object *obj = &bo->tbo.base;
-		struct ttm_dma_tt *ttm;
 
 		resv = bo->tbo.base.resv;
 		if (obj->import_attach && bo_va->is_xgmi) {
···
 		}
 		mem = &bo->tbo.mem;
 		nodes = mem->mm_node;
-		if (mem->mem_type == TTM_PL_TT) {
-			ttm = container_of(bo->tbo.ttm, struct ttm_dma_tt, ttm);
-			pages_addr = ttm->dma_address;
-		}
+		if (mem->mem_type == TTM_PL_TT)
+			pages_addr = bo->tbo.ttm->dma_address;
 	}
 
 	if (bo) {

drivers/gpu/drm/nouveau/nouveau_bo.c

···
 nouveau_bo_sync_for_device(struct nouveau_bo *nvbo)
 {
 	struct nouveau_drm *drm = nouveau_bdev(nvbo->bo.bdev);
-	struct ttm_dma_tt *ttm_dma = (struct ttm_dma_tt *)nvbo->bo.ttm;
+	struct ttm_tt *ttm_dma = (struct ttm_tt *)nvbo->bo.ttm;
 	int i;
 
 	if (!ttm_dma)
···
 	if (nvbo->force_coherent)
 		return;
 
-	for (i = 0; i < ttm_dma->ttm.num_pages; i++)
+	for (i = 0; i < ttm_dma->num_pages; i++)
 		dma_sync_single_for_device(drm->dev->dev,
 					   ttm_dma->dma_address[i],
 					   PAGE_SIZE, DMA_TO_DEVICE);
···
 nouveau_bo_sync_for_cpu(struct nouveau_bo *nvbo)
 {
 	struct nouveau_drm *drm = nouveau_bdev(nvbo->bo.bdev);
-	struct ttm_dma_tt *ttm_dma = (struct ttm_dma_tt *)nvbo->bo.ttm;
+	struct ttm_tt *ttm_dma = (struct ttm_tt *)nvbo->bo.ttm;
 	int i;
 
 	if (!ttm_dma)
···
 	if (nvbo->force_coherent)
 		return;
 
-	for (i = 0; i < ttm_dma->ttm.num_pages; i++)
+	for (i = 0; i < ttm_dma->num_pages; i++)
 		dma_sync_single_for_cpu(drm->dev->dev, ttm_dma->dma_address[i],
 					PAGE_SIZE, DMA_FROM_DEVICE);
 }
···
 nouveau_ttm_tt_populate(struct ttm_bo_device *bdev,
 			struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 {
-	struct ttm_dma_tt *ttm_dma = (void *)ttm;
+	struct ttm_tt *ttm_dma = (void *)ttm;
 	struct nouveau_drm *drm;
 	struct device *dev;
 	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
···
 nouveau_ttm_tt_unpopulate(struct ttm_bo_device *bdev,
 			  struct ttm_tt *ttm)
 {
-	struct ttm_dma_tt *ttm_dma = (void *)ttm;
+	struct ttm_tt *ttm_dma = (void *)ttm;
 	struct nouveau_drm *drm;
 	struct device *dev;
 	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);

drivers/gpu/drm/nouveau/nouveau_mem.c

···
 }
 
 int
-nouveau_mem_host(struct ttm_resource *reg, struct ttm_dma_tt *tt)
+nouveau_mem_host(struct ttm_resource *reg, struct ttm_tt *tt)
 {
 	struct nouveau_mem *mem = nouveau_mem(reg);
 	struct nouveau_cli *cli = mem->cli;
···
 		mem->comp = 0;
 	}
 
-	if (tt->ttm.sg) args.sgl = tt->ttm.sg->sgl;
-	else            args.dma = tt->dma_address;
+	if (tt->sg)
+		args.sgl = tt->sg->sgl;
+	else
+		args.dma = tt->dma_address;
 
 	mutex_lock(&drm->master.lock);
 	cli->base.super = true;

drivers/gpu/drm/nouveau/nouveau_mem.h

···
 #ifndef __NOUVEAU_MEM_H__
 #define __NOUVEAU_MEM_H__
 #include <drm/ttm/ttm_bo_api.h>
-struct ttm_dma_tt;
+struct ttm_tt;
 
 #include <nvif/mem.h>
 #include <nvif/vmm.h>
···
 		    struct ttm_resource *);
 void nouveau_mem_del(struct ttm_resource *);
 int nouveau_mem_vram(struct ttm_resource *, bool contig, u8 page);
-int nouveau_mem_host(struct ttm_resource *, struct ttm_dma_tt *);
+int nouveau_mem_host(struct ttm_resource *, struct ttm_tt *);
 void nouveau_mem_fini(struct nouveau_mem *);
 int nouveau_mem_map(struct nouveau_mem *, struct nvif_vmm *, struct nvif_vma *);
 #endif

drivers/gpu/drm/nouveau/nouveau_sgdma.c

···
 	/* this has to be the first field so populate/unpopulated in
 	 * nouve_bo.c works properly, otherwise have to move them here
 	 */
-	struct ttm_dma_tt ttm;
+	struct ttm_tt ttm;
 	struct nouveau_mem *mem;
 };
 
···
 	if (ttm) {
 		nouveau_sgdma_unbind(bdev, ttm);
 		ttm_tt_destroy_common(bdev, ttm);
-		ttm_dma_tt_fini(&nvbe->ttm);
+		ttm_tt_fini(&nvbe->ttm);
 		kfree(nvbe);
 	}
 }
···
 		kfree(nvbe);
 		return NULL;
 	}
-	return &nvbe->ttm.ttm;
+	return &nvbe->ttm;
 }

drivers/gpu/drm/qxl/qxl_ttm.c

···
 	ttm = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 	if (ttm == NULL)
 		return NULL;
-	if (ttm_tt_init(ttm, bo, page_flags, ttm_cached)) {
+	if (ttm_dma_tt_init(ttm, bo, page_flags, ttm_cached)) {
 		kfree(ttm);
 		return NULL;
 	}

drivers/gpu/drm/radeon/radeon_ttm.c

···
  * TTM backend functions.
  */
 struct radeon_ttm_tt {
-	struct ttm_dma_tt		ttm;
+	struct ttm_tt		ttm;
 	u64				offset;
 
 	uint64_t			userptr;
···
 	radeon_ttm_backend_unbind(bdev, ttm);
 	ttm_tt_destroy_common(bdev, ttm);
 
-	ttm_dma_tt_fini(&gtt->ttm);
+	ttm_tt_fini(&gtt->ttm);
 	kfree(gtt);
 }
 
···
 		kfree(gtt);
 		return NULL;
 	}
-	return &gtt->ttm.ttm;
+	return &gtt->ttm;
 }
 
 static struct radeon_ttm_tt *radeon_ttm_tt_to_gtt(struct radeon_device *rdev,
···
 
 	if (!ttm)
 		return NULL;
-	return container_of(ttm, struct radeon_ttm_tt, ttm.ttm);
+	return container_of(ttm, struct radeon_ttm_tt, ttm);
 }
 
 static int radeon_ttm_tt_populate(struct ttm_bo_device *bdev,

drivers/gpu/drm/ttm/ttm_bo.c

···
 
 	size += ttm_round_pot(struct_size);
 	size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
-	size += ttm_round_pot(sizeof(struct ttm_dma_tt));
+	size += ttm_round_pot(sizeof(struct ttm_tt));
 	return size;
 }
 EXPORT_SYMBOL(ttm_bo_dma_acc_size);

drivers/gpu/drm/ttm/ttm_page_alloc.c

···
 }
 EXPORT_SYMBOL(ttm_pool_unpopulate);
 
-int ttm_populate_and_map_pages(struct device *dev, struct ttm_dma_tt *tt,
+int ttm_populate_and_map_pages(struct device *dev, struct ttm_tt *tt,
 					struct ttm_operation_ctx *ctx)
 {
 	unsigned i, j;
 	int r;
 
-	r = ttm_pool_populate(&tt->ttm, ctx);
+	r = ttm_pool_populate(tt, ctx);
 	if (r)
 		return r;
 
-	for (i = 0; i < tt->ttm.num_pages; ++i) {
-		struct page *p = tt->ttm.pages[i];
+	for (i = 0; i < tt->num_pages; ++i) {
+		struct page *p = tt->pages[i];
 		size_t num_pages = 1;
 
-		for (j = i + 1; j < tt->ttm.num_pages; ++j) {
-			if (++p != tt->ttm.pages[j])
+		for (j = i + 1; j < tt->num_pages; ++j) {
+			if (++p != tt->pages[j])
 				break;
 
 			++num_pages;
 		}
 
-		tt->dma_address[i] = dma_map_page(dev, tt->ttm.pages[i],
+		tt->dma_address[i] = dma_map_page(dev, tt->pages[i],
 						  0, num_pages * PAGE_SIZE,
 						  DMA_BIDIRECTIONAL);
 		if (dma_mapping_error(dev, tt->dma_address[i])) {
···
 					       PAGE_SIZE, DMA_BIDIRECTIONAL);
 				tt->dma_address[i] = 0;
 			}
-			ttm_pool_unpopulate(&tt->ttm);
+			ttm_pool_unpopulate(tt);
 			return -EFAULT;
 		}
 
···
 }
 EXPORT_SYMBOL(ttm_populate_and_map_pages);
 
-void ttm_unmap_and_unpopulate_pages(struct device *dev, struct ttm_dma_tt *tt)
+void ttm_unmap_and_unpopulate_pages(struct device *dev, struct ttm_tt *tt)
 {
 	unsigned i, j;
 
-	for (i = 0; i < tt->ttm.num_pages;) {
-		struct page *p = tt->ttm.pages[i];
+	for (i = 0; i < tt->num_pages;) {
+		struct page *p = tt->pages[i];
 		size_t num_pages = 1;
 
-		if (!tt->dma_address[i] || !tt->ttm.pages[i]) {
+		if (!tt->dma_address[i] || !tt->pages[i]) {
 			++i;
 			continue;
 		}
 
-		for (j = i + 1; j < tt->ttm.num_pages; ++j) {
-			if (++p != tt->ttm.pages[j])
+		for (j = i + 1; j < tt->num_pages; ++j) {
+			if (++p != tt->pages[j])
 				break;
 
 			++num_pages;
···
 
 		i += num_pages;
 	}
-	ttm_pool_unpopulate(&tt->ttm);
+	ttm_pool_unpopulate(tt);
 }
 EXPORT_SYMBOL(ttm_unmap_and_unpopulate_pages);
 

drivers/gpu/drm/ttm/ttm_page_alloc_dma.c

···
  * return dma_page pointer if success, otherwise NULL.
  */
 static struct dma_page *ttm_dma_pool_get_pages(struct dma_pool *pool,
-				  struct ttm_dma_tt *ttm_dma,
+				  struct ttm_tt *ttm,
 				  unsigned index)
 {
 	struct dma_page *d_page = NULL;
-	struct ttm_tt *ttm = &ttm_dma->ttm;
 	unsigned long irq_flags;
 	int count;
 
···
 	if (count) {
 		d_page = list_first_entry(&pool->free_list, struct dma_page, page_list);
 		ttm->pages[index] = d_page->p;
-		ttm_dma->dma_address[index] = d_page->dma;
-		list_move_tail(&d_page->page_list, &ttm_dma->pages_list);
+		ttm->dma_address[index] = d_page->dma;
+		list_move_tail(&d_page->page_list, &ttm->pages_list);
 		pool->npages_in_use += 1;
 		pool->npages_free -= 1;
 	}
···
 	return d_page;
 }
 
-static gfp_t ttm_dma_pool_gfp_flags(struct ttm_dma_tt *ttm_dma, bool huge)
+static gfp_t ttm_dma_pool_gfp_flags(struct ttm_tt *ttm, bool huge)
 {
-	struct ttm_tt *ttm = &ttm_dma->ttm;
 	gfp_t gfp_flags;
 
 	if (ttm->page_flags & TTM_PAGE_FLAG_DMA32)
···
  * On success pages list will hold count number of correctly
  * cached pages. On failure will hold the negative return value (-ENOMEM, etc).
  */
-int ttm_dma_populate(struct ttm_dma_tt *ttm_dma, struct device *dev,
+int ttm_dma_populate(struct ttm_tt *ttm, struct device *dev,
 			struct ttm_operation_ctx *ctx)
 {
 	struct ttm_mem_global *mem_glob = &ttm_mem_glob;
-	struct ttm_tt *ttm = &ttm_dma->ttm;
 	unsigned long num_pages = ttm->num_pages;
 	struct dma_pool *pool;
 	struct dma_page *d_page;
···
 	if (ttm_check_under_lowerlimit(mem_glob, num_pages, ctx))
 		return -ENOMEM;
 
-	INIT_LIST_HEAD(&ttm_dma->pages_list);
+	INIT_LIST_HEAD(&ttm->pages_list);
 	i = 0;
 
 	type = ttm_to_type(ttm->page_flags, ttm->caching);
···
 
 	pool = ttm_dma_find_pool(dev, type | IS_HUGE);
 	if (!pool) {
-		gfp_t gfp_flags = ttm_dma_pool_gfp_flags(ttm_dma, true);
+		gfp_t gfp_flags = ttm_dma_pool_gfp_flags(ttm, true);
 
 		pool = ttm_dma_pool_init(dev, gfp_flags, type | IS_HUGE);
 		if (IS_ERR_OR_NULL(pool))
···
 	while (num_pages >= HPAGE_PMD_NR) {
 		unsigned j;
 
-		d_page = ttm_dma_pool_get_pages(pool, ttm_dma, i);
+		d_page = ttm_dma_pool_get_pages(pool, ttm, i);
 		if (!d_page)
 			break;
 
 		ret = ttm_mem_global_alloc_page(mem_glob, ttm->pages[i],
 						pool->size, ctx);
 		if (unlikely(ret != 0)) {
-			ttm_dma_unpopulate(ttm_dma, dev);
+			ttm_dma_unpopulate(ttm, dev);
 			return -ENOMEM;
 		}
 
 		d_page->vaddr |= VADDR_FLAG_UPDATED_COUNT;
 		for (j = i + 1; j < (i + HPAGE_PMD_NR); ++j) {
 			ttm->pages[j] = ttm->pages[j - 1] + 1;
-			ttm_dma->dma_address[j] = ttm_dma->dma_address[j - 1] +
+			ttm->dma_address[j] = ttm->dma_address[j - 1] +
 				PAGE_SIZE;
 		}
 
···
 
 	pool = ttm_dma_find_pool(dev, type);
 	if (!pool) {
-		gfp_t gfp_flags = ttm_dma_pool_gfp_flags(ttm_dma, false);
+		gfp_t gfp_flags = ttm_dma_pool_gfp_flags(ttm, false);
 
 		pool = ttm_dma_pool_init(dev, gfp_flags, type);
 		if (IS_ERR_OR_NULL(pool))
···
 	}
 
 	while (num_pages) {
-		d_page = ttm_dma_pool_get_pages(pool, ttm_dma, i);
+		d_page = ttm_dma_pool_get_pages(pool, ttm, i);
 		if (!d_page) {
-			ttm_dma_unpopulate(ttm_dma, dev);
+			ttm_dma_unpopulate(ttm, dev);
 			return -ENOMEM;
 		}
 
 		ret = ttm_mem_global_alloc_page(mem_glob, ttm->pages[i],
 						pool->size, ctx);
 		if (unlikely(ret != 0)) {
-			ttm_dma_unpopulate(ttm_dma, dev);
+			ttm_dma_unpopulate(ttm, dev);
 			return -ENOMEM;
 		}
 
···
 EXPORT_SYMBOL_GPL(ttm_dma_populate);
 
 /* Put all pages in pages list to correct pool to wait for reuse */
-void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
+void ttm_dma_unpopulate(struct ttm_tt *ttm, struct device *dev)
 {
 	struct ttm_mem_global *mem_glob = &ttm_mem_glob;
-	struct ttm_tt *ttm = &ttm_dma->ttm;
 	struct dma_pool *pool;
 	struct dma_page *d_page, *next;
 	enum pool_type type;
···
 	pool = ttm_dma_find_pool(dev, type | IS_HUGE);
 	if (pool) {
 		count = 0;
-		list_for_each_entry_safe(d_page, next, &ttm_dma->pages_list,
+		list_for_each_entry_safe(d_page, next, &ttm->pages_list,
 					 page_list) {
 			if (!(d_page->vaddr & VADDR_FLAG_HUGE_POOL))
 				continue;
···
 
 	/* make sure pages array match list and count number of pages */
 	count = 0;
-	list_for_each_entry_safe(d_page, next, &ttm_dma->pages_list,
+	list_for_each_entry_safe(d_page, next, &ttm->pages_list,
 				 page_list) {
 		ttm->pages[count] = d_page->p;
 		count++;
···
 		pool->nfrees += count;
 	} else {
 		pool->npages_free += count;
-		list_splice(&ttm_dma->pages_list, &pool->free_list);
+		list_splice(&ttm->pages_list, &pool->free_list);
 		/*
 		 * Wait to have at at least NUM_PAGES_TO_ALLOC number of pages
 		 * to free in order to minimize calls to set_memory_wb().
···
 	}
 	spin_unlock_irqrestore(&pool->lock, irq_flags);
 
-	INIT_LIST_HEAD(&ttm_dma->pages_list);
+	INIT_LIST_HEAD(&ttm->pages_list);
 	for (i = 0; i < ttm->num_pages; i++) {
 		ttm->pages[i] = NULL;
-		ttm_dma->dma_address[i] = 0;
+		ttm->dma_address[i] = 0;
 	}
 
 	/* shrink pool if necessary (only on !is_cached pools)*/

drivers/gpu/drm/ttm/ttm_tt.c

···
 	return 0;
 }
 
-static int ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
+static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
 {
-	ttm->ttm.pages = kvmalloc_array(ttm->ttm.num_pages,
-					  sizeof(*ttm->ttm.pages) +
-					  sizeof(*ttm->dma_address),
-					  GFP_KERNEL | __GFP_ZERO);
-	if (!ttm->ttm.pages)
+	ttm->pages = kvmalloc_array(ttm->num_pages,
+				    sizeof(*ttm->pages) +
+				    sizeof(*ttm->dma_address),
+				    GFP_KERNEL | __GFP_ZERO);
+	if (!ttm->pages)
 		return -ENOMEM;
-	ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
+
+	ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
 	return 0;
 }
 
-static int ttm_sg_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
+static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
 {
-	ttm->dma_address = kvmalloc_array(ttm->ttm.num_pages,
+	ttm->dma_address = kvmalloc_array(ttm->num_pages,
 					  sizeof(*ttm->dma_address),
 					  GFP_KERNEL | __GFP_ZERO);
 	if (!ttm->dma_address)
···
 	ttm->num_pages = bo->num_pages;
 	ttm->caching = ttm_cached;
 	ttm->page_flags = page_flags;
+	ttm->dma_address = NULL;
 	ttm->swap_storage = NULL;
 	ttm->sg = bo->sg;
+	INIT_LIST_HEAD(&ttm->pages_list);
 	ttm->caching = caching;
 }
 
···
 
 void ttm_tt_fini(struct ttm_tt *ttm)
 {
-	kvfree(ttm->pages);
+	if (ttm->pages)
+		kvfree(ttm->pages);
+	else
+		kvfree(ttm->dma_address);
 	ttm->pages = NULL;
+	ttm->dma_address = NULL;
 }
 EXPORT_SYMBOL(ttm_tt_fini);
 
-int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+int ttm_dma_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
 		    uint32_t page_flags, enum ttm_caching caching)
 {
-	struct ttm_tt *ttm = &ttm_dma->ttm;
-
 	ttm_tt_init_fields(ttm, bo, page_flags, caching);
 
-	INIT_LIST_HEAD(&ttm_dma->pages_list);
-	if (ttm_dma_tt_alloc_page_directory(ttm_dma)) {
+	if (ttm_dma_tt_alloc_page_directory(ttm)) {
 		pr_err("Failed allocating page table\n");
 		return -ENOMEM;
 	}
···
 }
 EXPORT_SYMBOL(ttm_dma_tt_init);
 
-int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
 		   uint32_t page_flags, enum ttm_caching caching)
 {
-	struct ttm_tt *ttm = &ttm_dma->ttm;
 	int ret;
 
 	ttm_tt_init_fields(ttm, bo, page_flags, caching);
 
-	INIT_LIST_HEAD(&ttm_dma->pages_list);
 	if (page_flags & TTM_PAGE_FLAG_SG)
-		ret = ttm_sg_tt_alloc_page_directory(ttm_dma);
+		ret = ttm_sg_tt_alloc_page_directory(ttm);
 	else
-		ret = ttm_dma_tt_alloc_page_directory(ttm_dma);
+		ret = ttm_dma_tt_alloc_page_directory(ttm);
 	if (ret) {
 		pr_err("Failed allocating page table\n");
 		return -ENOMEM;
···
 	return 0;
 }
 EXPORT_SYMBOL(ttm_sg_tt_init);
-
-void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
-{
-	struct ttm_tt *ttm = &ttm_dma->ttm;
-
-	if (ttm->pages)
-		kvfree(ttm->pages);
-	else
-		kvfree(ttm_dma->dma_address);
-	ttm->pages = NULL;
-	ttm_dma->dma_address = NULL;
-}
-EXPORT_SYMBOL(ttm_dma_tt_fini);
 
 int ttm_tt_swapin(struct ttm_tt *ttm)
 {

drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c

···
 };
 
 struct vmw_ttm_tt {
-	struct ttm_dma_tt dma_ttm;
+	struct ttm_tt dma_ttm;
 	struct vmw_private *dev_priv;
 	int gmr_id;
 	struct vmw_mob *mob;
···
 		return 0;
 
 	vsgt->mode = dev_priv->map_mode;
-	vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
-	vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
+	vsgt->pages = vmw_tt->dma_ttm.pages;
+	vsgt->num_pages = vmw_tt->dma_ttm.num_pages;
 	vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 	vsgt->sgt = &vmw_tt->sgt;
 
···
 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 {
 	struct vmw_ttm_tt *vmw_tt =
-		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
 
 	return &vmw_tt->vsgt;
 }
···
 			struct ttm_tt *ttm, struct ttm_resource *bo_mem)
 {
 	struct vmw_ttm_tt *vmw_be =
-		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+		container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 	int ret = 0;
 
 	if (!bo_mem)
···
 			   struct ttm_tt *ttm)
 {
 	struct vmw_ttm_tt *vmw_be =
-		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+		container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 
 	if (!vmw_be->bound)
 		return;
···
 static void vmw_ttm_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
 {
 	struct vmw_ttm_tt *vmw_be =
-		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+		container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 
 	vmw_ttm_unbind(bdev, ttm);
 	ttm_tt_destroy_common(bdev, ttm);
 	vmw_ttm_unmap_dma(vmw_be);
 	if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
-		ttm_dma_tt_fini(&vmw_be->dma_ttm);
+		ttm_tt_fini(&vmw_be->dma_ttm);
 	else
 		ttm_tt_fini(ttm);
 
···
 			    struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 {
 	struct vmw_ttm_tt *vmw_tt =
-		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+		container_of(ttm, struct vmw_ttm_tt, dma_ttm);
 	struct vmw_private *dev_priv = vmw_tt->dev_priv;
 	struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 	int ret;
···
 			       struct ttm_tt *ttm)
 {
 	struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
-						 dma_ttm.ttm);
+						 dma_ttm);
 	struct vmw_private *dev_priv = vmw_tt->dev_priv;
 	struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 
···
 		ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags,
 				      ttm_cached);
 	else
-		ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags,
+		ret = ttm_tt_init(&vmw_be->dma_ttm, bo, page_flags,
 				  ttm_cached);
 	if (unlikely(ret != 0))
 		goto out_no_init;
 
-	return &vmw_be->dma_ttm.ttm;
+	return &vmw_be->dma_ttm;
 out_no_init:
 	kfree(vmw_be);
 	return NULL;
···
 	ret = vmw_ttm_populate(bo->bdev, bo->ttm, &ctx);
 	if (likely(ret == 0)) {
 		struct vmw_ttm_tt *vmw_tt =
-			container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+			container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
 		ret = vmw_ttm_map_dma(vmw_tt);
 	}
 

include/drm/ttm/ttm_page_alloc.h

···
 /**
  * Populates and DMA maps pages to fullfil a ttm_dma_populate() request
  */
-int ttm_populate_and_map_pages(struct device *dev, struct ttm_dma_tt *tt,
+int ttm_populate_and_map_pages(struct device *dev, struct ttm_tt *tt,
 				struct ttm_operation_ctx *ctx);
 
 /**
  * Unpopulates and DMA unmaps pages as part of a
  * ttm_dma_unpopulate() request */
-void ttm_unmap_and_unpopulate_pages(struct device *dev, struct ttm_dma_tt *tt);
+void ttm_unmap_and_unpopulate_pages(struct device *dev, struct ttm_tt *tt);
 
 /**
  * Output the state of pools to debugfs file
···
  */
 int ttm_dma_page_alloc_debugfs(struct seq_file *m, void *data);
 
-int ttm_dma_populate(struct ttm_dma_tt *ttm_dma, struct device *dev,
+int ttm_dma_populate(struct ttm_tt *ttm_dma, struct device *dev,
 			struct ttm_operation_ctx *ctx);
-void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev);
+void ttm_dma_unpopulate(struct ttm_tt *ttm_dma, struct device *dev);
 
 #else
 static inline int ttm_dma_page_alloc_init(struct ttm_mem_global *glob,
···
 {
 	return 0;
 }
-static inline int ttm_dma_populate(struct ttm_dma_tt *ttm_dma,
+static inline int ttm_dma_populate(struct ttm_tt *ttm_dma,
 				struct device *dev,
 				struct ttm_operation_ctx *ctx)
 {
 	return -ENOMEM;
 }
-static inline void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma,
+static inline void ttm_dma_unpopulate(struct ttm_tt *ttm_dma,
 				      struct device *dev)
 {
 }

include/drm/ttm/ttm_tt.h

···
  * struct ttm_tt
  *
  * @pages: Array of pages backing the data.
+ * @page_flags: see TTM_PAGE_FLAG_*
  * @num_pages: Number of pages in the page array.
- * @bdev: Pointer to the current struct ttm_bo_device.
- * @be: Pointer to the ttm backend.
+ * @sg: for SG objects via dma-buf
+ * @dma_address: The DMA (bus) addresses of the pages
  * @swap_storage: Pointer to shmem struct file for swap storage.
- * @caching_state: The current caching state of the pages.
- * @state: The current binding state of the pages.
+ * @pages_list: used by some page allocation backend
+ * @caching: The current caching state of the pages.
  *
  * This is a structure holding the pages, caching- and aperture binding
  * status for a buffer object that isn't backed by fixed (VRAM / AGP)
···
 	struct page **pages;
 	uint32_t page_flags;
 	uint32_t num_pages;
-	struct sg_table *sg; /* for SG objects via dma-buf */
+	struct sg_table *sg;
+	dma_addr_t *dma_address;
 	struct file *swap_storage;
+	struct list_head pages_list;
 	enum ttm_caching caching;
 };
 
···
 {
 	return tt->page_flags & TTM_PAGE_FLAG_PRIV_POPULATED;
 }
-
-/**
- * struct ttm_dma_tt
- *
- * @ttm: Base ttm_tt struct.
- * @dma_address: The DMA (bus) addresses of the pages
- * @pages_list: used by some page allocation backend
- *
- * This is a structure holding the pages, caching- and aperture binding
- * status for a buffer object that isn't backed by fixed (VRAM / AGP)
- * memory.
- */
-struct ttm_dma_tt {
-	struct ttm_tt ttm;
-	dma_addr_t *dma_address;
-	struct list_head pages_list;
-};
 
 /**
  * ttm_tt_create
···
  */
 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
 		uint32_t page_flags, enum ttm_caching caching);
-int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+int ttm_dma_tt_init(struct ttm_tt *ttm_dma, struct ttm_buffer_object *bo,
 		    uint32_t page_flags, enum ttm_caching caching);
-int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+int ttm_sg_tt_init(struct ttm_tt *ttm_dma, struct ttm_buffer_object *bo,
 		   uint32_t page_flags, enum ttm_caching caching);
 
 /**
···
  * Free memory of ttm_tt structure
  */
 void ttm_tt_fini(struct ttm_tt *ttm);
-void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma);
 
 /**
  * ttm_ttm_destroy: