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ba4e7d97 TH |
1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA | |
4 | * All Rights Reserved. | |
5 | * | |
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: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
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. | |
25 | * | |
26 | **************************************************************************/ | |
27 | /* | |
28 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
29 | */ | |
30 | ||
ba4e7d97 TH |
31 | #include <linux/vmalloc.h> |
32 | #include <linux/sched.h> | |
33 | #include <linux/highmem.h> | |
34 | #include <linux/pagemap.h> | |
35 | #include <linux/file.h> | |
36 | #include <linux/swap.h> | |
c9c97b8c | 37 | #include "drm_cache.h" |
ba4e7d97 TH |
38 | #include "ttm/ttm_module.h" |
39 | #include "ttm/ttm_bo_driver.h" | |
40 | #include "ttm/ttm_placement.h" | |
41 | ||
42 | static int ttm_tt_swapin(struct ttm_tt *ttm); | |
43 | ||
ba4e7d97 TH |
44 | /** |
45 | * Allocates storage for pointers to the pages that back the ttm. | |
46 | * | |
47 | * Uses kmalloc if possible. Otherwise falls back to vmalloc. | |
48 | */ | |
49 | static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) | |
50 | { | |
51 | unsigned long size = ttm->num_pages * sizeof(*ttm->pages); | |
52 | ttm->pages = NULL; | |
53 | ||
54 | if (size <= PAGE_SIZE) | |
55 | ttm->pages = kzalloc(size, GFP_KERNEL); | |
56 | ||
57 | if (!ttm->pages) { | |
58 | ttm->pages = vmalloc_user(size); | |
59 | if (ttm->pages) | |
60 | ttm->page_flags |= TTM_PAGE_FLAG_VMALLOC; | |
61 | } | |
62 | } | |
63 | ||
64 | static void ttm_tt_free_page_directory(struct ttm_tt *ttm) | |
65 | { | |
66 | if (ttm->page_flags & TTM_PAGE_FLAG_VMALLOC) { | |
67 | vfree(ttm->pages); | |
68 | ttm->page_flags &= ~TTM_PAGE_FLAG_VMALLOC; | |
69 | } else { | |
70 | kfree(ttm->pages); | |
71 | } | |
72 | ttm->pages = NULL; | |
73 | } | |
74 | ||
75 | static struct page *ttm_tt_alloc_page(unsigned page_flags) | |
76 | { | |
b42db2b1 | 77 | gfp_t gfp_flags = GFP_USER; |
ad49f501 | 78 | |
ba4e7d97 | 79 | if (page_flags & TTM_PAGE_FLAG_ZERO_ALLOC) |
ad49f501 DA |
80 | gfp_flags |= __GFP_ZERO; |
81 | ||
82 | if (page_flags & TTM_PAGE_FLAG_DMA32) | |
83 | gfp_flags |= __GFP_DMA32; | |
b42db2b1 DA |
84 | else |
85 | gfp_flags |= __GFP_HIGHMEM; | |
ba4e7d97 | 86 | |
ad49f501 | 87 | return alloc_page(gfp_flags); |
ba4e7d97 TH |
88 | } |
89 | ||
90 | static void ttm_tt_free_user_pages(struct ttm_tt *ttm) | |
91 | { | |
92 | int write; | |
93 | int dirty; | |
94 | struct page *page; | |
95 | int i; | |
96 | struct ttm_backend *be = ttm->be; | |
97 | ||
98 | BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER)); | |
99 | write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0); | |
100 | dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0); | |
101 | ||
102 | if (be) | |
103 | be->func->clear(be); | |
104 | ||
105 | for (i = 0; i < ttm->num_pages; ++i) { | |
106 | page = ttm->pages[i]; | |
107 | if (page == NULL) | |
108 | continue; | |
109 | ||
110 | if (page == ttm->dummy_read_page) { | |
111 | BUG_ON(write); | |
112 | continue; | |
113 | } | |
114 | ||
115 | if (write && dirty && !PageReserved(page)) | |
116 | set_page_dirty_lock(page); | |
117 | ||
118 | ttm->pages[i] = NULL; | |
a987fcaa | 119 | ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE); |
ba4e7d97 TH |
120 | put_page(page); |
121 | } | |
122 | ttm->state = tt_unpopulated; | |
123 | ttm->first_himem_page = ttm->num_pages; | |
124 | ttm->last_lomem_page = -1; | |
125 | } | |
126 | ||
127 | static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index) | |
128 | { | |
129 | struct page *p; | |
a987fcaa | 130 | struct ttm_mem_global *mem_glob = ttm->glob->mem_glob; |
ba4e7d97 TH |
131 | int ret; |
132 | ||
133 | while (NULL == (p = ttm->pages[index])) { | |
134 | p = ttm_tt_alloc_page(ttm->page_flags); | |
135 | ||
136 | if (!p) | |
137 | return NULL; | |
138 | ||
5fd9cbad TH |
139 | ret = ttm_mem_global_alloc_page(mem_glob, p, false, false); |
140 | if (unlikely(ret != 0)) | |
141 | goto out_err; | |
142 | ||
143 | if (PageHighMem(p)) | |
ba4e7d97 | 144 | ttm->pages[--ttm->first_himem_page] = p; |
5fd9cbad | 145 | else |
ba4e7d97 | 146 | ttm->pages[++ttm->last_lomem_page] = p; |
ba4e7d97 TH |
147 | } |
148 | return p; | |
149 | out_err: | |
150 | put_page(p); | |
151 | return NULL; | |
152 | } | |
153 | ||
154 | struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index) | |
155 | { | |
156 | int ret; | |
157 | ||
158 | if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { | |
159 | ret = ttm_tt_swapin(ttm); | |
160 | if (unlikely(ret != 0)) | |
161 | return NULL; | |
162 | } | |
163 | return __ttm_tt_get_page(ttm, index); | |
164 | } | |
165 | ||
166 | int ttm_tt_populate(struct ttm_tt *ttm) | |
167 | { | |
168 | struct page *page; | |
169 | unsigned long i; | |
170 | struct ttm_backend *be; | |
171 | int ret; | |
172 | ||
173 | if (ttm->state != tt_unpopulated) | |
174 | return 0; | |
175 | ||
176 | if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { | |
177 | ret = ttm_tt_swapin(ttm); | |
178 | if (unlikely(ret != 0)) | |
179 | return ret; | |
180 | } | |
181 | ||
182 | be = ttm->be; | |
183 | ||
184 | for (i = 0; i < ttm->num_pages; ++i) { | |
185 | page = __ttm_tt_get_page(ttm, i); | |
186 | if (!page) | |
187 | return -ENOMEM; | |
188 | } | |
189 | ||
190 | be->func->populate(be, ttm->num_pages, ttm->pages, | |
191 | ttm->dummy_read_page); | |
192 | ttm->state = tt_unbound; | |
193 | return 0; | |
194 | } | |
4bfd75cb | 195 | EXPORT_SYMBOL(ttm_tt_populate); |
ba4e7d97 TH |
196 | |
197 | #ifdef CONFIG_X86 | |
198 | static inline int ttm_tt_set_page_caching(struct page *p, | |
199 | enum ttm_caching_state c_state) | |
200 | { | |
db78e27d FJ |
201 | int ret = 0; |
202 | ||
ba4e7d97 TH |
203 | if (PageHighMem(p)) |
204 | return 0; | |
205 | ||
db78e27d FJ |
206 | if (get_page_memtype(p) != -1) { |
207 | /* p isn't in the default caching state, set it to | |
208 | * writeback first to free its current memtype. */ | |
209 | ||
210 | ret = set_pages_wb(p, 1); | |
211 | if (ret) | |
212 | return ret; | |
ba4e7d97 | 213 | } |
db78e27d FJ |
214 | |
215 | if (c_state == tt_wc) | |
216 | ret = set_memory_wc((unsigned long) page_address(p), 1); | |
217 | else if (c_state == tt_uncached) | |
218 | ret = set_pages_uc(p, 1); | |
219 | ||
220 | return ret; | |
ba4e7d97 TH |
221 | } |
222 | #else /* CONFIG_X86 */ | |
223 | static inline int ttm_tt_set_page_caching(struct page *p, | |
224 | enum ttm_caching_state c_state) | |
225 | { | |
226 | return 0; | |
227 | } | |
228 | #endif /* CONFIG_X86 */ | |
229 | ||
230 | /* | |
231 | * Change caching policy for the linear kernel map | |
232 | * for range of pages in a ttm. | |
233 | */ | |
234 | ||
235 | static int ttm_tt_set_caching(struct ttm_tt *ttm, | |
236 | enum ttm_caching_state c_state) | |
237 | { | |
238 | int i, j; | |
239 | struct page *cur_page; | |
240 | int ret; | |
241 | ||
242 | if (ttm->caching_state == c_state) | |
243 | return 0; | |
244 | ||
245 | if (c_state != tt_cached) { | |
246 | ret = ttm_tt_populate(ttm); | |
247 | if (unlikely(ret != 0)) | |
248 | return ret; | |
249 | } | |
250 | ||
251 | if (ttm->caching_state == tt_cached) | |
c9c97b8c | 252 | drm_clflush_pages(ttm->pages, ttm->num_pages); |
ba4e7d97 TH |
253 | |
254 | for (i = 0; i < ttm->num_pages; ++i) { | |
255 | cur_page = ttm->pages[i]; | |
256 | if (likely(cur_page != NULL)) { | |
257 | ret = ttm_tt_set_page_caching(cur_page, c_state); | |
258 | if (unlikely(ret != 0)) | |
259 | goto out_err; | |
260 | } | |
261 | } | |
262 | ||
263 | ttm->caching_state = c_state; | |
264 | ||
265 | return 0; | |
266 | ||
267 | out_err: | |
268 | for (j = 0; j < i; ++j) { | |
269 | cur_page = ttm->pages[j]; | |
270 | if (likely(cur_page != NULL)) { | |
271 | (void)ttm_tt_set_page_caching(cur_page, | |
272 | ttm->caching_state); | |
273 | } | |
274 | } | |
275 | ||
276 | return ret; | |
277 | } | |
278 | ||
279 | int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) | |
280 | { | |
281 | enum ttm_caching_state state; | |
282 | ||
283 | if (placement & TTM_PL_FLAG_WC) | |
284 | state = tt_wc; | |
285 | else if (placement & TTM_PL_FLAG_UNCACHED) | |
286 | state = tt_uncached; | |
287 | else | |
288 | state = tt_cached; | |
289 | ||
290 | return ttm_tt_set_caching(ttm, state); | |
291 | } | |
df67bed9 | 292 | EXPORT_SYMBOL(ttm_tt_set_placement_caching); |
ba4e7d97 TH |
293 | |
294 | static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm) | |
295 | { | |
296 | int i; | |
297 | struct page *cur_page; | |
298 | struct ttm_backend *be = ttm->be; | |
299 | ||
300 | if (be) | |
301 | be->func->clear(be); | |
302 | (void)ttm_tt_set_caching(ttm, tt_cached); | |
303 | for (i = 0; i < ttm->num_pages; ++i) { | |
304 | cur_page = ttm->pages[i]; | |
305 | ttm->pages[i] = NULL; | |
306 | if (cur_page) { | |
307 | if (page_count(cur_page) != 1) | |
308 | printk(KERN_ERR TTM_PFX | |
309 | "Erroneous page count. " | |
310 | "Leaking pages.\n"); | |
a987fcaa | 311 | ttm_mem_global_free_page(ttm->glob->mem_glob, |
5fd9cbad | 312 | cur_page); |
ba4e7d97 TH |
313 | __free_page(cur_page); |
314 | } | |
315 | } | |
316 | ttm->state = tt_unpopulated; | |
317 | ttm->first_himem_page = ttm->num_pages; | |
318 | ttm->last_lomem_page = -1; | |
319 | } | |
320 | ||
321 | void ttm_tt_destroy(struct ttm_tt *ttm) | |
322 | { | |
323 | struct ttm_backend *be; | |
324 | ||
325 | if (unlikely(ttm == NULL)) | |
326 | return; | |
327 | ||
328 | be = ttm->be; | |
329 | if (likely(be != NULL)) { | |
330 | be->func->destroy(be); | |
331 | ttm->be = NULL; | |
332 | } | |
333 | ||
334 | if (likely(ttm->pages != NULL)) { | |
335 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) | |
336 | ttm_tt_free_user_pages(ttm); | |
337 | else | |
338 | ttm_tt_free_alloced_pages(ttm); | |
339 | ||
340 | ttm_tt_free_page_directory(ttm); | |
341 | } | |
342 | ||
343 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) && | |
344 | ttm->swap_storage) | |
345 | fput(ttm->swap_storage); | |
346 | ||
347 | kfree(ttm); | |
348 | } | |
349 | ||
350 | int ttm_tt_set_user(struct ttm_tt *ttm, | |
351 | struct task_struct *tsk, | |
352 | unsigned long start, unsigned long num_pages) | |
353 | { | |
354 | struct mm_struct *mm = tsk->mm; | |
355 | int ret; | |
356 | int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0; | |
a987fcaa | 357 | struct ttm_mem_global *mem_glob = ttm->glob->mem_glob; |
ba4e7d97 TH |
358 | |
359 | BUG_ON(num_pages != ttm->num_pages); | |
360 | BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0); | |
361 | ||
362 | /** | |
363 | * Account user pages as lowmem pages for now. | |
364 | */ | |
365 | ||
366 | ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE, | |
5fd9cbad | 367 | false, false); |
ba4e7d97 TH |
368 | if (unlikely(ret != 0)) |
369 | return ret; | |
370 | ||
371 | down_read(&mm->mmap_sem); | |
372 | ret = get_user_pages(tsk, mm, start, num_pages, | |
373 | write, 0, ttm->pages, NULL); | |
374 | up_read(&mm->mmap_sem); | |
375 | ||
376 | if (ret != num_pages && write) { | |
377 | ttm_tt_free_user_pages(ttm); | |
5fd9cbad | 378 | ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE); |
ba4e7d97 TH |
379 | return -ENOMEM; |
380 | } | |
381 | ||
382 | ttm->tsk = tsk; | |
383 | ttm->start = start; | |
384 | ttm->state = tt_unbound; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size, | |
390 | uint32_t page_flags, struct page *dummy_read_page) | |
391 | { | |
392 | struct ttm_bo_driver *bo_driver = bdev->driver; | |
393 | struct ttm_tt *ttm; | |
394 | ||
395 | if (!bo_driver) | |
396 | return NULL; | |
397 | ||
398 | ttm = kzalloc(sizeof(*ttm), GFP_KERNEL); | |
399 | if (!ttm) | |
400 | return NULL; | |
401 | ||
a987fcaa | 402 | ttm->glob = bdev->glob; |
ba4e7d97 TH |
403 | ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
404 | ttm->first_himem_page = ttm->num_pages; | |
405 | ttm->last_lomem_page = -1; | |
406 | ttm->caching_state = tt_cached; | |
407 | ttm->page_flags = page_flags; | |
408 | ||
409 | ttm->dummy_read_page = dummy_read_page; | |
410 | ||
411 | ttm_tt_alloc_page_directory(ttm); | |
412 | if (!ttm->pages) { | |
413 | ttm_tt_destroy(ttm); | |
414 | printk(KERN_ERR TTM_PFX "Failed allocating page table\n"); | |
415 | return NULL; | |
416 | } | |
417 | ttm->be = bo_driver->create_ttm_backend_entry(bdev); | |
418 | if (!ttm->be) { | |
419 | ttm_tt_destroy(ttm); | |
420 | printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n"); | |
421 | return NULL; | |
422 | } | |
423 | ttm->state = tt_unpopulated; | |
424 | return ttm; | |
425 | } | |
426 | ||
427 | void ttm_tt_unbind(struct ttm_tt *ttm) | |
428 | { | |
429 | int ret; | |
430 | struct ttm_backend *be = ttm->be; | |
431 | ||
432 | if (ttm->state == tt_bound) { | |
433 | ret = be->func->unbind(be); | |
434 | BUG_ON(ret); | |
435 | ttm->state = tt_unbound; | |
436 | } | |
437 | } | |
438 | ||
439 | int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) | |
440 | { | |
441 | int ret = 0; | |
442 | struct ttm_backend *be; | |
443 | ||
444 | if (!ttm) | |
445 | return -EINVAL; | |
446 | ||
447 | if (ttm->state == tt_bound) | |
448 | return 0; | |
449 | ||
450 | be = ttm->be; | |
451 | ||
452 | ret = ttm_tt_populate(ttm); | |
453 | if (ret) | |
454 | return ret; | |
455 | ||
456 | ret = be->func->bind(be, bo_mem); | |
457 | if (ret) { | |
458 | printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n"); | |
459 | return ret; | |
460 | } | |
461 | ||
462 | ttm->state = tt_bound; | |
463 | ||
464 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) | |
465 | ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY; | |
466 | return 0; | |
467 | } | |
468 | EXPORT_SYMBOL(ttm_tt_bind); | |
469 | ||
470 | static int ttm_tt_swapin(struct ttm_tt *ttm) | |
471 | { | |
472 | struct address_space *swap_space; | |
473 | struct file *swap_storage; | |
474 | struct page *from_page; | |
475 | struct page *to_page; | |
476 | void *from_virtual; | |
477 | void *to_virtual; | |
478 | int i; | |
479 | int ret; | |
480 | ||
481 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) { | |
482 | ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start, | |
483 | ttm->num_pages); | |
484 | if (unlikely(ret != 0)) | |
485 | return ret; | |
486 | ||
487 | ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; | |
488 | return 0; | |
489 | } | |
490 | ||
491 | swap_storage = ttm->swap_storage; | |
492 | BUG_ON(swap_storage == NULL); | |
493 | ||
494 | swap_space = swap_storage->f_path.dentry->d_inode->i_mapping; | |
495 | ||
496 | for (i = 0; i < ttm->num_pages; ++i) { | |
497 | from_page = read_mapping_page(swap_space, i, NULL); | |
498 | if (IS_ERR(from_page)) | |
499 | goto out_err; | |
500 | to_page = __ttm_tt_get_page(ttm, i); | |
501 | if (unlikely(to_page == NULL)) | |
502 | goto out_err; | |
503 | ||
504 | preempt_disable(); | |
505 | from_virtual = kmap_atomic(from_page, KM_USER0); | |
506 | to_virtual = kmap_atomic(to_page, KM_USER1); | |
507 | memcpy(to_virtual, from_virtual, PAGE_SIZE); | |
508 | kunmap_atomic(to_virtual, KM_USER1); | |
509 | kunmap_atomic(from_virtual, KM_USER0); | |
510 | preempt_enable(); | |
511 | page_cache_release(from_page); | |
512 | } | |
513 | ||
514 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP)) | |
515 | fput(swap_storage); | |
516 | ttm->swap_storage = NULL; | |
517 | ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; | |
518 | ||
519 | return 0; | |
520 | out_err: | |
521 | ttm_tt_free_alloced_pages(ttm); | |
522 | return -ENOMEM; | |
523 | } | |
524 | ||
525 | int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage) | |
526 | { | |
527 | struct address_space *swap_space; | |
528 | struct file *swap_storage; | |
529 | struct page *from_page; | |
530 | struct page *to_page; | |
531 | void *from_virtual; | |
532 | void *to_virtual; | |
533 | int i; | |
534 | ||
535 | BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); | |
536 | BUG_ON(ttm->caching_state != tt_cached); | |
537 | ||
538 | /* | |
539 | * For user buffers, just unpin the pages, as there should be | |
540 | * vma references. | |
541 | */ | |
542 | ||
543 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) { | |
544 | ttm_tt_free_user_pages(ttm); | |
545 | ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; | |
546 | ttm->swap_storage = NULL; | |
547 | return 0; | |
548 | } | |
549 | ||
550 | if (!persistant_swap_storage) { | |
551 | swap_storage = shmem_file_setup("ttm swap", | |
552 | ttm->num_pages << PAGE_SHIFT, | |
553 | 0); | |
554 | if (unlikely(IS_ERR(swap_storage))) { | |
555 | printk(KERN_ERR "Failed allocating swap storage.\n"); | |
556 | return -ENOMEM; | |
557 | } | |
558 | } else | |
559 | swap_storage = persistant_swap_storage; | |
560 | ||
561 | swap_space = swap_storage->f_path.dentry->d_inode->i_mapping; | |
562 | ||
563 | for (i = 0; i < ttm->num_pages; ++i) { | |
564 | from_page = ttm->pages[i]; | |
565 | if (unlikely(from_page == NULL)) | |
566 | continue; | |
567 | to_page = read_mapping_page(swap_space, i, NULL); | |
568 | if (unlikely(to_page == NULL)) | |
569 | goto out_err; | |
570 | ||
571 | preempt_disable(); | |
572 | from_virtual = kmap_atomic(from_page, KM_USER0); | |
573 | to_virtual = kmap_atomic(to_page, KM_USER1); | |
574 | memcpy(to_virtual, from_virtual, PAGE_SIZE); | |
575 | kunmap_atomic(to_virtual, KM_USER1); | |
576 | kunmap_atomic(from_virtual, KM_USER0); | |
577 | preempt_enable(); | |
578 | set_page_dirty(to_page); | |
579 | mark_page_accessed(to_page); | |
580 | page_cache_release(to_page); | |
581 | } | |
582 | ||
583 | ttm_tt_free_alloced_pages(ttm); | |
584 | ttm->swap_storage = swap_storage; | |
585 | ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; | |
586 | if (persistant_swap_storage) | |
587 | ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP; | |
588 | ||
589 | return 0; | |
590 | out_err: | |
591 | if (!persistant_swap_storage) | |
592 | fput(swap_storage); | |
593 | ||
594 | return -ENOMEM; | |
595 | } |