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 #include <linux/sched.h>
32 #include <linux/highmem.h>
33 #include <linux/pagemap.h>
34 #include <linux/file.h>
35 #include <linux/swap.h>
36 #include <linux/slab.h>
37 #include "drm_cache.h"
38 #include "drm_mem_util.h"
39 #include "ttm/ttm_module.h"
40 #include "ttm/ttm_bo_driver.h"
41 #include "ttm/ttm_placement.h"
42 #include "ttm/ttm_page_alloc.h"
44 static int ttm_tt_swapin(struct ttm_tt *ttm);
47 * Allocates storage for pointers to the pages that back the ttm.
49 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
51 ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(*ttm->pages));
54 static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
56 drm_free_large(ttm->pages);
60 static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
66 struct ttm_backend *be = ttm->be;
68 BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER));
69 write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0);
70 dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0);
75 for (i = 0; i < ttm->num_pages; ++i) {
80 if (page == ttm->dummy_read_page) {
85 if (write && dirty && !PageReserved(page))
86 set_page_dirty_lock(page);
89 ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE);
92 ttm->state = tt_unpopulated;
93 ttm->first_himem_page = ttm->num_pages;
94 ttm->last_lomem_page = -1;
97 static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
101 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
104 while (NULL == (p = ttm->pages[index])) {
108 ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1);
113 p = list_first_entry(&h, struct page, lru);
115 ret = ttm_mem_global_alloc_page(mem_glob, p, false, false);
116 if (unlikely(ret != 0))
120 ttm->pages[--ttm->first_himem_page] = p;
122 ttm->pages[++ttm->last_lomem_page] = p;
130 struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index)
134 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
135 ret = ttm_tt_swapin(ttm);
136 if (unlikely(ret != 0))
139 return __ttm_tt_get_page(ttm, index);
142 int ttm_tt_populate(struct ttm_tt *ttm)
146 struct ttm_backend *be;
149 if (ttm->state != tt_unpopulated)
152 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
153 ret = ttm_tt_swapin(ttm);
154 if (unlikely(ret != 0))
160 for (i = 0; i < ttm->num_pages; ++i) {
161 page = __ttm_tt_get_page(ttm, i);
166 be->func->populate(be, ttm->num_pages, ttm->pages,
167 ttm->dummy_read_page);
168 ttm->state = tt_unbound;
171 EXPORT_SYMBOL(ttm_tt_populate);
174 static inline int ttm_tt_set_page_caching(struct page *p,
175 enum ttm_caching_state c_old,
176 enum ttm_caching_state c_new)
183 if (c_old != tt_cached) {
184 /* p isn't in the default caching state, set it to
185 * writeback first to free its current memtype. */
187 ret = set_pages_wb(p, 1);
193 ret = set_memory_wc((unsigned long) page_address(p), 1);
194 else if (c_new == tt_uncached)
195 ret = set_pages_uc(p, 1);
199 #else /* CONFIG_X86 */
200 static inline int ttm_tt_set_page_caching(struct page *p,
201 enum ttm_caching_state c_old,
202 enum ttm_caching_state c_new)
206 #endif /* CONFIG_X86 */
209 * Change caching policy for the linear kernel map
210 * for range of pages in a ttm.
213 static int ttm_tt_set_caching(struct ttm_tt *ttm,
214 enum ttm_caching_state c_state)
217 struct page *cur_page;
220 if (ttm->caching_state == c_state)
223 if (ttm->state == tt_unpopulated) {
224 /* Change caching but don't populate */
225 ttm->caching_state = c_state;
229 if (ttm->caching_state == tt_cached)
230 drm_clflush_pages(ttm->pages, ttm->num_pages);
232 for (i = 0; i < ttm->num_pages; ++i) {
233 cur_page = ttm->pages[i];
234 if (likely(cur_page != NULL)) {
235 ret = ttm_tt_set_page_caching(cur_page,
238 if (unlikely(ret != 0))
243 ttm->caching_state = c_state;
248 for (j = 0; j < i; ++j) {
249 cur_page = ttm->pages[j];
250 if (likely(cur_page != NULL)) {
251 (void)ttm_tt_set_page_caching(cur_page, c_state,
259 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
261 enum ttm_caching_state state;
263 if (placement & TTM_PL_FLAG_WC)
265 else if (placement & TTM_PL_FLAG_UNCACHED)
270 return ttm_tt_set_caching(ttm, state);
272 EXPORT_SYMBOL(ttm_tt_set_placement_caching);
274 static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
279 struct page *cur_page;
280 struct ttm_backend *be = ttm->be;
286 for (i = 0; i < ttm->num_pages; ++i) {
288 cur_page = ttm->pages[i];
289 ttm->pages[i] = NULL;
291 if (page_count(cur_page) != 1)
292 printk(KERN_ERR TTM_PFX
293 "Erroneous page count. "
295 ttm_mem_global_free_page(ttm->glob->mem_glob,
297 list_add(&cur_page->lru, &h);
301 ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state);
302 ttm->state = tt_unpopulated;
303 ttm->first_himem_page = ttm->num_pages;
304 ttm->last_lomem_page = -1;
307 void ttm_tt_destroy(struct ttm_tt *ttm)
309 struct ttm_backend *be;
311 if (unlikely(ttm == NULL))
315 if (likely(be != NULL)) {
316 be->func->destroy(be);
320 if (likely(ttm->pages != NULL)) {
321 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
322 ttm_tt_free_user_pages(ttm);
324 ttm_tt_free_alloced_pages(ttm);
326 ttm_tt_free_page_directory(ttm);
329 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) &&
331 fput(ttm->swap_storage);
336 int ttm_tt_set_user(struct ttm_tt *ttm,
337 struct task_struct *tsk,
338 unsigned long start, unsigned long num_pages)
340 struct mm_struct *mm = tsk->mm;
342 int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
343 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
345 BUG_ON(num_pages != ttm->num_pages);
346 BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
349 * Account user pages as lowmem pages for now.
352 ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
354 if (unlikely(ret != 0))
357 down_read(&mm->mmap_sem);
358 ret = get_user_pages(tsk, mm, start, num_pages,
359 write, 0, ttm->pages, NULL);
360 up_read(&mm->mmap_sem);
362 if (ret != num_pages && write) {
363 ttm_tt_free_user_pages(ttm);
364 ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE);
370 ttm->state = tt_unbound;
375 struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
376 uint32_t page_flags, struct page *dummy_read_page)
378 struct ttm_bo_driver *bo_driver = bdev->driver;
384 ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
388 ttm->glob = bdev->glob;
389 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
390 ttm->first_himem_page = ttm->num_pages;
391 ttm->last_lomem_page = -1;
392 ttm->caching_state = tt_cached;
393 ttm->page_flags = page_flags;
395 ttm->dummy_read_page = dummy_read_page;
397 ttm_tt_alloc_page_directory(ttm);
400 printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
403 ttm->be = bo_driver->create_ttm_backend_entry(bdev);
406 printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n");
409 ttm->state = tt_unpopulated;
413 void ttm_tt_unbind(struct ttm_tt *ttm)
416 struct ttm_backend *be = ttm->be;
418 if (ttm->state == tt_bound) {
419 ret = be->func->unbind(be);
421 ttm->state = tt_unbound;
425 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
428 struct ttm_backend *be;
433 if (ttm->state == tt_bound)
438 ret = ttm_tt_populate(ttm);
442 ret = be->func->bind(be, bo_mem);
443 if (unlikely(ret != 0))
446 ttm->state = tt_bound;
448 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
449 ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
452 EXPORT_SYMBOL(ttm_tt_bind);
454 static int ttm_tt_swapin(struct ttm_tt *ttm)
456 struct address_space *swap_space;
457 struct file *swap_storage;
458 struct page *from_page;
459 struct page *to_page;
465 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
466 ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
468 if (unlikely(ret != 0))
471 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
475 swap_storage = ttm->swap_storage;
476 BUG_ON(swap_storage == NULL);
478 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
480 for (i = 0; i < ttm->num_pages; ++i) {
481 from_page = read_mapping_page(swap_space, i, NULL);
482 if (IS_ERR(from_page)) {
483 ret = PTR_ERR(from_page);
486 to_page = __ttm_tt_get_page(ttm, i);
487 if (unlikely(to_page == NULL))
491 from_virtual = kmap_atomic(from_page, KM_USER0);
492 to_virtual = kmap_atomic(to_page, KM_USER1);
493 memcpy(to_virtual, from_virtual, PAGE_SIZE);
494 kunmap_atomic(to_virtual, KM_USER1);
495 kunmap_atomic(from_virtual, KM_USER0);
497 page_cache_release(from_page);
500 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP))
502 ttm->swap_storage = NULL;
503 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
507 ttm_tt_free_alloced_pages(ttm);
511 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage)
513 struct address_space *swap_space;
514 struct file *swap_storage;
515 struct page *from_page;
516 struct page *to_page;
522 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
523 BUG_ON(ttm->caching_state != tt_cached);
526 * For user buffers, just unpin the pages, as there should be
530 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
531 ttm_tt_free_user_pages(ttm);
532 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
533 ttm->swap_storage = NULL;
537 if (!persistant_swap_storage) {
538 swap_storage = shmem_file_setup("ttm swap",
539 ttm->num_pages << PAGE_SHIFT,
541 if (unlikely(IS_ERR(swap_storage))) {
542 printk(KERN_ERR "Failed allocating swap storage.\n");
543 return PTR_ERR(swap_storage);
546 swap_storage = persistant_swap_storage;
548 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
550 for (i = 0; i < ttm->num_pages; ++i) {
551 from_page = ttm->pages[i];
552 if (unlikely(from_page == NULL))
554 to_page = read_mapping_page(swap_space, i, NULL);
555 if (unlikely(IS_ERR(to_page))) {
556 ret = PTR_ERR(to_page);
560 from_virtual = kmap_atomic(from_page, KM_USER0);
561 to_virtual = kmap_atomic(to_page, KM_USER1);
562 memcpy(to_virtual, from_virtual, PAGE_SIZE);
563 kunmap_atomic(to_virtual, KM_USER1);
564 kunmap_atomic(from_virtual, KM_USER0);
566 set_page_dirty(to_page);
567 mark_page_accessed(to_page);
568 page_cache_release(to_page);
571 ttm_tt_free_alloced_pages(ttm);
572 ttm->swap_storage = swap_storage;
573 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
574 if (persistant_swap_storage)
575 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP;
579 if (!persistant_swap_storage)