 @@ -1,553 +1,559 @@
 /**************************************************************************
+ *
  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
  * All Rights Reserved.
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sub license, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
+ *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
  **************************************************************************/
 /*
  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  */
 #define pr_fmt(fmt) "[TTM] " fmt
 #include <linux/sched.h>
 #include <linux/highmem.h>
 #include <linux/pagemap.h>
 #include <linux/shmem_fs.h>
 #include <linux/file.h>
 #include <linux/swap.h>
 #include <linux/slab.h>
 #include <linux/export.h>
 #include <linux/printk.h>
 #include <drm/drm_cache.h>
 #include <drm/drm_mem_util.h>
 #include <drm/ttm/ttm_module.h>
 #include <drm/ttm/ttm_bo_driver.h>
 #include <drm/ttm/ttm_placement.h>
 #include <drm/ttm/ttm_page_alloc.h>
 #include <drm/bus_dma_hacks.h>
 /**
  * Allocates storage for pointers to the pages that back the ttm.
  */
 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
+{
 	ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*));
+}
 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
+{
 	ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, sizeof(void*));
 #ifndef __NetBSD__
 	ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages,
 					    sizeof(*ttm->dma_address));
 #endif
+}
 #ifdef CONFIG_X86
 static inline int ttm_tt_set_page_caching(struct page *p,
 					  enum ttm_caching_state c_old,
 					  enum ttm_caching_state c_new)
+{
 #ifdef __NetBSD__
 	return 0;
 #else
 	int ret = 0;
 	if (PageHighMem(p))
 		return 0;
 	if (c_old != tt_cached) {
 		/* p isn't in the default caching state, set it to
 		 * writeback first to free its current memtype. */
 		ret = set_pages_wb(p, 1);
 		if (ret)
 			return ret;
+	}
 	if (c_new == tt_wc)
 		ret = set_memory_wc((unsigned long) page_address(p), 1);
 	else if (c_new == tt_uncached)
 		ret = set_pages_uc(p, 1);
 	return ret;
 #endif
+}
 #else /* CONFIG_X86 */
 static inline int ttm_tt_set_page_caching(struct page *p,
 					  enum ttm_caching_state c_old,
 					  enum ttm_caching_state c_new)
+{
 	return 0;
+}
 #endif /* CONFIG_X86 */
 /*
  * Change caching policy for the linear kernel map
  * for range of pages in a ttm.
  */
 static int ttm_tt_set_caching(struct ttm_tt *ttm,
 			      enum ttm_caching_state c_state)
+{
 	int i, j;
 	struct page *cur_page;
 	int ret;
 	if (ttm->caching_state == c_state)
 		return 0;
 	if (ttm->state == tt_unpopulated) {
 		/* Change caching but don't populate */
 		ttm->caching_state = c_state;
 		return 0;
+	}
 	if (ttm->caching_state == tt_cached)
 		drm_clflush_pages(ttm->pages, ttm->num_pages);
 	for (i = 0; i < ttm->num_pages; ++i) {
 		cur_page = ttm->pages[i];
 		if (likely(cur_page != NULL)) {
 			ret = ttm_tt_set_page_caching(cur_page,
 						      ttm->caching_state,
 						      c_state);
 			if (unlikely(ret != 0))
 				goto out_err;
+		}
+	}
 	ttm->caching_state = c_state;
 	return 0;
 out_err:
 	for (j = 0; j < i; ++j) {
 		cur_page = ttm->pages[j];
 		if (likely(cur_page != NULL)) {
 			(void)ttm_tt_set_page_caching(cur_page, c_state,
 						      ttm->caching_state);
+		}
+	}
 	return ret;
+}
 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
+{
 	enum ttm_caching_state state;
 	if (placement & TTM_PL_FLAG_WC)
 		state = tt_wc;
 	else if (placement & TTM_PL_FLAG_UNCACHED)
 		state = tt_uncached;
 	else
 		state = tt_cached;
 	return ttm_tt_set_caching(ttm, state);
+}
 EXPORT_SYMBOL(ttm_tt_set_placement_caching);
 void ttm_tt_destroy(struct ttm_tt *ttm)
+{
 	if (unlikely(ttm == NULL))
 		return;
 	if (ttm->state == tt_bound) {
 		ttm_tt_unbind(ttm);
+	}
 	if (ttm->state == tt_unbound)
 		ttm_tt_unpopulate(ttm);
 #ifndef __NetBSD__
 	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
 	    ttm->swap_storage)
 		fput(ttm->swap_storage);
 	ttm->swap_storage = NULL;
 #endif
 	ttm->func->destroy(ttm);
+}
 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
 		unsigned long size, uint32_t page_flags,
 		struct page *dummy_read_page)
+{
 	ttm->bdev = bdev;
 	ttm->glob = bdev->glob;
 	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	ttm->caching_state = tt_cached;
 	ttm->page_flags = page_flags;
 	ttm->dummy_read_page = dummy_read_page;
 	ttm->state = tt_unpopulated;
 #ifdef __NetBSD__
 	WARN(size == 0, "zero-size allocation in %s, please file a NetBSD PR",
 	    __func__);	/* paranoia -- can't prove in five minutes */
 	size = MAX(size, 1);
 	ttm->swap_storage = uao_create(roundup2(size, PAGE_SIZE), 0);
 	uao_set_pgfl(ttm->swap_storage, bus_dmamem_pgfl(bdev->dmat));
 #else
 	ttm->swap_storage = NULL;
 #endif
 	TAILQ_INIT(&ttm->pglist);
 	ttm_tt_alloc_page_directory(ttm);
 	if (!ttm->pages) {
 		ttm_tt_destroy(ttm);
 		pr_err("Failed allocating page table\n");
 		return -ENOMEM;
+	}
 	return 0;
+}
 EXPORT_SYMBOL(ttm_tt_init);
 void ttm_tt_fini(struct ttm_tt *ttm)
+{
 #ifdef __NetBSD__
 	uao_detach(ttm->swap_storage);
 	ttm->swap_storage = NULL;
 #endif
 	drm_free_large(ttm->pages);
 	ttm->pages = NULL;
+}
 EXPORT_SYMBOL(ttm_tt_fini);
 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
 		unsigned long size, uint32_t page_flags,
 		struct page *dummy_read_page)
+{
 	struct ttm_tt *ttm = &ttm_dma->ttm;
 	ttm->bdev = bdev;
 	ttm->glob = bdev->glob;
 	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	ttm->caching_state = tt_cached;
 	ttm->page_flags = page_flags;
 	ttm->dummy_read_page = dummy_read_page;
 	ttm->state = tt_unpopulated;
 #ifdef __NetBSD__
 	WARN(size == 0, "zero-size allocation in %s, please file a NetBSD PR",
 	    __func__);	/* paranoia -- can't prove in five minutes */
 	size = MAX(size, 1);
 	ttm->swap_storage = uao_create(roundup2(size, PAGE_SIZE), 0);
 	uao_set_pgfl(ttm->swap_storage, bus_dmamem_pgfl(bdev->dmat));
 #else
 	ttm->swap_storage = NULL;
 #endif
 	TAILQ_INIT(&ttm->pglist);
 	INIT_LIST_HEAD(&ttm_dma->pages_list);
 	ttm_dma_tt_alloc_page_directory(ttm_dma);
 #ifdef __NetBSD__
+    {
 	int error;
 	if (ttm->num_pages > (SIZE_MAX /
 		MIN(sizeof(ttm_dma->dma_segs[0]), PAGE_SIZE))) {
 		error = ENOMEM;
 		goto fail0;
+	}
 	ttm_dma->dma_segs = kmem_alloc((ttm->num_pages *
 		sizeof(ttm_dma->dma_segs[0])), KM_SLEEP);
 	error = bus_dmamap_create(ttm->bdev->dmat,
 	    (ttm->num_pages * PAGE_SIZE), ttm->num_pages, PAGE_SIZE, 0,
 	    BUS_DMA_WAITOK, &ttm_dma->dma_address);
 	if (error)
 		goto fail1;
 	return 0;
 fail2: __unused
 	bus_dmamap_destroy(ttm->bdev->dmat, ttm_dma->dma_address);
 fail1:	kmem_free(ttm_dma->dma_segs, (ttm->num_pages *
 		sizeof(ttm_dma->dma_segs[0])));
 fail0:	KASSERT(error);
 	ttm_tt_destroy(ttm);
 	/* XXX errno NetBSD->Linux */
 	return -error;
+    }
 #else
 	if (!ttm->pages || !ttm_dma->dma_address) {
 		ttm_tt_destroy(ttm);
 		pr_err("Failed allocating page table\n");
 		return -ENOMEM;
+	}
 	return 0;
 #endif
+}
 EXPORT_SYMBOL(ttm_dma_tt_init);
 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
+{
 	struct ttm_tt *ttm = &ttm_dma->ttm;
 #ifdef __NetBSD__
 	uao_detach(ttm->swap_storage);
 	ttm->swap_storage = NULL;
 #endif
 	drm_free_large(ttm->pages);
 	ttm->pages = NULL;
 #ifdef __NetBSD__
 	bus_dmamap_destroy(ttm->bdev->dmat, ttm_dma->dma_address);
 	kmem_free(ttm_dma->dma_segs, (ttm->num_pages *
 		sizeof(ttm_dma->dma_segs[0])));
 #else
 	drm_free_large(ttm_dma->dma_address);
 	ttm_dma->dma_address = NULL;
 #endif
+}
 EXPORT_SYMBOL(ttm_dma_tt_fini);
 void ttm_tt_unbind(struct ttm_tt *ttm)
+{
 	int ret __diagused;
 	if (ttm->state == tt_bound) {
 		ret = ttm->func->unbind(ttm);
 		BUG_ON(ret);
 		ttm->state = tt_unbound;
+	}
+}
 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
+{
 	int ret = 0;
 	if (!ttm)
 		return -EINVAL;
 	if (ttm->state == tt_bound)
 		return 0;
 	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 	if (ret)
 		return ret;
 	ret = ttm->func->bind(ttm, bo_mem);
 	if (unlikely(ret != 0))
 		return ret;
 	ttm->state = tt_bound;
 	return 0;
+}
 EXPORT_SYMBOL(ttm_tt_bind);
 #ifdef __NetBSD__
 /*
  * ttm_tt_wire(ttm)
+ *
  *	Wire the uvm pages of ttm and fill the ttm page array.  ttm
  *	must be unpopulated or unbound, and must be marked swapped.
  *	This does not change either state -- the caller is expected to
  *	include it among other operations for such a state transition.
  */
 int
 ttm_tt_wire(struct ttm_tt *ttm)
+{
 	struct uvm_object *uobj = ttm->swap_storage;
 	struct vm_page *page;
 	unsigned i;
 	int error;
 	KASSERTMSG((ttm->state == tt_unpopulated || ttm->state == tt_unbound),
 	    "ttm_tt %p must be unpopulated or unbound for wiring,"
 	    " but state=%d",
 	    ttm, (int)ttm->state);
 	KASSERT(ISSET(ttm->page_flags, TTM_PAGE_FLAG_SWAPPED));
 	KASSERT(uobj != NULL);
 	error = uvm_obj_wirepages(uobj, 0, (ttm->num_pages << PAGE_SHIFT),
 	    &ttm->pglist);
 	if (error)
 		/* XXX errno NetBSD->Linux */
 		return -error;
 	i = 0;
 	TAILQ_FOREACH(page, &ttm->pglist, pageq.queue) {
 		KASSERT(i < ttm->num_pages);
 		KASSERT(ttm->pages[i] == NULL);
 		ttm->pages[i] = container_of(page, struct page, p_vmp);
 		i++;
+	}
 	KASSERT(i == ttm->num_pages);
 	/* Success!  */
 	return 0;
+}
 /*
  * ttm_tt_unwire(ttm)
+ *
  *	Nullify the ttm page array and unwire the uvm pages of ttm.
  *	ttm must be unbound and must be marked swapped.  This does not
  *	change either state -- the caller is expected to include it
  *	among other operations for such a state transition.
  */
 void
 ttm_tt_unwire(struct ttm_tt *ttm)
+{
 	struct uvm_object *uobj = ttm->swap_storage;
 	unsigned i;
 	KASSERTMSG((ttm->state == tt_unbound),
 	    "ttm_tt %p must be unbound for unwiring, but state=%d",
 	    ttm, (int)ttm->state);
 	KASSERT(!ISSET(ttm->page_flags, TTM_PAGE_FLAG_SWAPPED));
 	KASSERT(uobj != NULL);
 	uvm_obj_unwirepages(uobj, 0, (ttm->num_pages << PAGE_SHIFT));
 	for (i = 0; i < ttm->num_pages; i++)
 		ttm->pages[i] = NULL;
+}
 #endif
 #ifndef __NetBSD__
 int ttm_tt_swapin(struct ttm_tt *ttm)
+{
 	struct address_space *swap_space;
 	struct file *swap_storage;
 	struct page *from_page;
 	struct page *to_page;
 	int i;
 	int ret = -ENOMEM;
 	swap_storage = ttm->swap_storage;
 	BUG_ON(swap_storage == NULL);
 	swap_space = file_inode(swap_storage)->i_mapping;
 	for (i = 0; i < ttm->num_pages; ++i) {
 		from_page = shmem_read_mapping_page(swap_space, i);
 		if (IS_ERR(from_page)) {
 			ret = PTR_ERR(from_page);
 			goto out_err;
+		}
 		to_page = ttm->pages[i];
 		if (unlikely(to_page == NULL))
 			goto out_err;
 		copy_highpage(to_page, from_page);
 		page_cache_release(from_page);
+	}
 	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
 		fput(swap_storage);
 	ttm->swap_storage = NULL;
 	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
 	return 0;
 out_err:
 	return ret;
+}
 #endif
 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
+{
 #ifdef __NetBSD__
 	KASSERTMSG((ttm->state == tt_unpopulated || ttm->state == tt_unbound),
 	    "ttm_tt %p must be unpopulated or unbound for swapout,"
 	    " but state=%d",
 	    ttm, (int)ttm->state);
 	KASSERTMSG((ttm->caching_state == tt_cached),
 	    "ttm_tt %p must be cached for swapout, but caching_state=%d",
 	    ttm, (int)ttm->caching_state);
 	KASSERT(persistent_swap_storage == NULL);
 	ttm->bdev->driver->ttm_tt_swapout(ttm);
 	return 0;
 #else
 	struct address_space *swap_space;
 	struct file *swap_storage;
 	struct page *from_page;
 	struct page *to_page;
 	int i;
 	int ret = -ENOMEM;
 	BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
 	BUG_ON(ttm->caching_state != tt_cached);
 	if (!persistent_swap_storage) {
 		swap_storage = shmem_file_setup("ttm swap",
 						ttm->num_pages << PAGE_SHIFT,
 );
 		if (unlikely(IS_ERR(swap_storage))) {
 			pr_err("Failed allocating swap storage\n");
 			return PTR_ERR(swap_storage);
+		}
 	} else
 		swap_storage = persistent_swap_storage;
 	swap_space = file_inode(swap_storage)->i_mapping;
 	for (i = 0; i < ttm->num_pages; ++i) {
 		from_page = ttm->pages[i];
 		if (unlikely(from_page == NULL))
 			continue;
 		to_page = shmem_read_mapping_page(swap_space, i);
 		if (unlikely(IS_ERR(to_page))) {
 			ret = PTR_ERR(to_page);
 			goto out_err;
+		}
 		copy_highpage(to_page, from_page);
 		set_page_dirty(to_page);
 		mark_page_accessed(to_page);
 		page_cache_release(to_page);
+	}
 	ttm_tt_unpopulate(ttm);
 	ttm->swap_storage = swap_storage;
 	ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
 	if (persistent_swap_storage)
 		ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
 	return 0;
 out_err:
 	if (!persistent_swap_storage)
 		fput(swap_storage);
 	return ret;
 #endif
+}
 static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
+{
 #ifndef __NetBSD__
 	pgoff_t i;
 	struct page **page = ttm->pages;
 	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
 		return;
 	for (i = 0; i < ttm->num_pages; ++i) {
 		(*page)->mapping = NULL;
 		(*page++)->index = 0;
+	}
 #endif
+}
 void ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
 	if (ttm->state == tt_unpopulated)
 		return;
 	ttm_tt_clear_mapping(ttm);
 	ttm->bdev->driver->ttm_tt_unpopulate(ttm);
+}