1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
31 #define pr_fmt(fmt) "[TTM] " fmt
33 #include <linux/sched.h>
34 #include <linux/highmem.h>
35 #include <linux/pagemap.h>
36 #include <linux/shmem_fs.h>
37 #include <linux/file.h>
38 #include <linux/swap.h>
39 #include <linux/slab.h>
40 #include <linux/export.h>
41 #include <drm/drm_cache.h>
42 #include <drm/ttm/ttm_module.h>
43 #include <drm/ttm/ttm_bo_driver.h>
44 #include <drm/ttm/ttm_placement.h>
45 #include <drm/ttm/ttm_page_alloc.h>
47 #include <asm/set_memory.h>
51 * Allocates storage for pointers to the pages that back the ttm.
53 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
55 ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
56 GFP_KERNEL | __GFP_ZERO);
59 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
61 ttm->ttm.pages = kvmalloc_array(ttm->ttm.num_pages,
62 sizeof(*ttm->ttm.pages) +
63 sizeof(*ttm->dma_address),
64 GFP_KERNEL | __GFP_ZERO);
65 ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
69 static inline int ttm_tt_set_page_caching(struct page *p,
70 enum ttm_caching_state c_old,
71 enum ttm_caching_state c_new)
78 if (c_old != tt_cached) {
79 /* p isn't in the default caching state, set it to
80 * writeback first to free its current memtype. */
82 ret = set_pages_wb(p, 1);
88 ret = set_memory_wc((unsigned long) page_address(p), 1);
89 else if (c_new == tt_uncached)
90 ret = set_pages_uc(p, 1);
94 #else /* CONFIG_X86 */
95 static inline int ttm_tt_set_page_caching(struct page *p,
96 enum ttm_caching_state c_old,
97 enum ttm_caching_state c_new)
101 #endif /* CONFIG_X86 */
104 * Change caching policy for the linear kernel map
105 * for range of pages in a ttm.
108 static int ttm_tt_set_caching(struct ttm_tt *ttm,
109 enum ttm_caching_state c_state)
112 struct page *cur_page;
115 if (ttm->caching_state == c_state)
118 if (ttm->state == tt_unpopulated) {
119 /* Change caching but don't populate */
120 ttm->caching_state = c_state;
124 if (ttm->caching_state == tt_cached)
125 drm_clflush_pages(ttm->pages, ttm->num_pages);
127 for (i = 0; i < ttm->num_pages; ++i) {
128 cur_page = ttm->pages[i];
129 if (likely(cur_page != NULL)) {
130 ret = ttm_tt_set_page_caching(cur_page,
133 if (unlikely(ret != 0))
138 ttm->caching_state = c_state;
143 for (j = 0; j < i; ++j) {
144 cur_page = ttm->pages[j];
145 if (likely(cur_page != NULL)) {
146 (void)ttm_tt_set_page_caching(cur_page, c_state,
154 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
156 enum ttm_caching_state state;
158 if (placement & TTM_PL_FLAG_WC)
160 else if (placement & TTM_PL_FLAG_UNCACHED)
165 return ttm_tt_set_caching(ttm, state);
167 EXPORT_SYMBOL(ttm_tt_set_placement_caching);
169 void ttm_tt_destroy(struct ttm_tt *ttm)
176 if (ttm->state == tt_unbound)
177 ttm_tt_unpopulate(ttm);
179 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
181 fput(ttm->swap_storage);
183 ttm->swap_storage = NULL;
184 ttm->func->destroy(ttm);
187 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
188 unsigned long size, uint32_t page_flags,
189 struct page *dummy_read_page)
192 ttm->glob = bdev->glob;
193 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
194 ttm->caching_state = tt_cached;
195 ttm->page_flags = page_flags;
196 ttm->dummy_read_page = dummy_read_page;
197 ttm->state = tt_unpopulated;
198 ttm->swap_storage = NULL;
200 ttm_tt_alloc_page_directory(ttm);
202 pr_err("Failed allocating page table\n");
207 EXPORT_SYMBOL(ttm_tt_init);
209 void ttm_tt_fini(struct ttm_tt *ttm)
214 EXPORT_SYMBOL(ttm_tt_fini);
216 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
217 unsigned long size, uint32_t page_flags,
218 struct page *dummy_read_page)
220 struct ttm_tt *ttm = &ttm_dma->ttm;
223 ttm->glob = bdev->glob;
224 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
225 ttm->caching_state = tt_cached;
226 ttm->page_flags = page_flags;
227 ttm->dummy_read_page = dummy_read_page;
228 ttm->state = tt_unpopulated;
229 ttm->swap_storage = NULL;
231 INIT_LIST_HEAD(&ttm_dma->pages_list);
232 ttm_dma_tt_alloc_page_directory(ttm_dma);
234 pr_err("Failed allocating page table\n");
239 EXPORT_SYMBOL(ttm_dma_tt_init);
241 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
243 struct ttm_tt *ttm = &ttm_dma->ttm;
247 ttm_dma->dma_address = NULL;
249 EXPORT_SYMBOL(ttm_dma_tt_fini);
251 void ttm_tt_unbind(struct ttm_tt *ttm)
255 if (ttm->state == tt_bound) {
256 ret = ttm->func->unbind(ttm);
258 ttm->state = tt_unbound;
262 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
269 if (ttm->state == tt_bound)
272 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
276 ret = ttm->func->bind(ttm, bo_mem);
277 if (unlikely(ret != 0))
280 ttm->state = tt_bound;
284 EXPORT_SYMBOL(ttm_tt_bind);
286 int ttm_tt_swapin(struct ttm_tt *ttm)
288 struct address_space *swap_space;
289 struct file *swap_storage;
290 struct page *from_page;
291 struct page *to_page;
295 swap_storage = ttm->swap_storage;
296 BUG_ON(swap_storage == NULL);
298 swap_space = swap_storage->f_mapping;
300 for (i = 0; i < ttm->num_pages; ++i) {
301 from_page = shmem_read_mapping_page(swap_space, i);
302 if (IS_ERR(from_page)) {
303 ret = PTR_ERR(from_page);
306 to_page = ttm->pages[i];
307 if (unlikely(to_page == NULL))
310 copy_highpage(to_page, from_page);
314 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
316 ttm->swap_storage = NULL;
317 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
324 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
326 struct address_space *swap_space;
327 struct file *swap_storage;
328 struct page *from_page;
329 struct page *to_page;
333 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
334 BUG_ON(ttm->caching_state != tt_cached);
336 if (!persistent_swap_storage) {
337 swap_storage = shmem_file_setup("ttm swap",
338 ttm->num_pages << PAGE_SHIFT,
340 if (IS_ERR(swap_storage)) {
341 pr_err("Failed allocating swap storage\n");
342 return PTR_ERR(swap_storage);
345 swap_storage = persistent_swap_storage;
347 swap_space = swap_storage->f_mapping;
349 for (i = 0; i < ttm->num_pages; ++i) {
350 from_page = ttm->pages[i];
351 if (unlikely(from_page == NULL))
353 to_page = shmem_read_mapping_page(swap_space, i);
354 if (IS_ERR(to_page)) {
355 ret = PTR_ERR(to_page);
358 copy_highpage(to_page, from_page);
359 set_page_dirty(to_page);
360 mark_page_accessed(to_page);
364 ttm_tt_unpopulate(ttm);
365 ttm->swap_storage = swap_storage;
366 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
367 if (persistent_swap_storage)
368 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
372 if (!persistent_swap_storage)
378 static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
381 struct page **page = ttm->pages;
383 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
386 for (i = 0; i < ttm->num_pages; ++i) {
387 (*page)->mapping = NULL;
388 (*page++)->index = 0;
392 void ttm_tt_unpopulate(struct ttm_tt *ttm)
394 if (ttm->state == tt_unpopulated)
397 ttm_tt_clear_mapping(ttm);
398 ttm->bdev->driver->ttm_tt_unpopulate(ttm);