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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/sched.h> |
32 | #include <linux/highmem.h> | |
33 | #include <linux/pagemap.h> | |
34 | #include <linux/file.h> | |
35 | #include <linux/swap.h> | |
c9c97b8c | 36 | #include "drm_cache.h" |
72e942dd | 37 | #include "drm_mem_util.h" |
ba4e7d97 TH |
38 | #include "ttm/ttm_module.h" |
39 | #include "ttm/ttm_bo_driver.h" | |
40 | #include "ttm/ttm_placement.h" | |
1403b1a3 | 41 | #include "ttm/ttm_page_alloc.h" |
ba4e7d97 TH |
42 | |
43 | static int ttm_tt_swapin(struct ttm_tt *ttm); | |
44 | ||
ba4e7d97 TH |
45 | /** |
46 | * Allocates storage for pointers to the pages that back the ttm. | |
ba4e7d97 TH |
47 | */ |
48 | static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) | |
49 | { | |
72e942dd | 50 | ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(*ttm->pages)); |
ba4e7d97 TH |
51 | } |
52 | ||
53 | static void ttm_tt_free_page_directory(struct ttm_tt *ttm) | |
54 | { | |
72e942dd | 55 | drm_free_large(ttm->pages); |
ba4e7d97 TH |
56 | ttm->pages = NULL; |
57 | } | |
58 | ||
ba4e7d97 TH |
59 | static void ttm_tt_free_user_pages(struct ttm_tt *ttm) |
60 | { | |
61 | int write; | |
62 | int dirty; | |
63 | struct page *page; | |
64 | int i; | |
65 | struct ttm_backend *be = ttm->be; | |
66 | ||
67 | BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER)); | |
68 | write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0); | |
69 | dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0); | |
70 | ||
71 | if (be) | |
72 | be->func->clear(be); | |
73 | ||
74 | for (i = 0; i < ttm->num_pages; ++i) { | |
75 | page = ttm->pages[i]; | |
76 | if (page == NULL) | |
77 | continue; | |
78 | ||
79 | if (page == ttm->dummy_read_page) { | |
80 | BUG_ON(write); | |
81 | continue; | |
82 | } | |
83 | ||
84 | if (write && dirty && !PageReserved(page)) | |
85 | set_page_dirty_lock(page); | |
86 | ||
87 | ttm->pages[i] = NULL; | |
a987fcaa | 88 | ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE); |
ba4e7d97 TH |
89 | put_page(page); |
90 | } | |
91 | ttm->state = tt_unpopulated; | |
92 | ttm->first_himem_page = ttm->num_pages; | |
93 | ttm->last_lomem_page = -1; | |
94 | } | |
95 | ||
96 | static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index) | |
97 | { | |
98 | struct page *p; | |
1403b1a3 | 99 | struct list_head h; |
a987fcaa | 100 | struct ttm_mem_global *mem_glob = ttm->glob->mem_glob; |
ba4e7d97 TH |
101 | int ret; |
102 | ||
103 | while (NULL == (p = ttm->pages[index])) { | |
ba4e7d97 | 104 | |
1403b1a3 PN |
105 | INIT_LIST_HEAD(&h); |
106 | ||
107 | ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1); | |
108 | ||
109 | if (ret != 0) | |
ba4e7d97 TH |
110 | return NULL; |
111 | ||
1403b1a3 PN |
112 | p = list_first_entry(&h, struct page, lru); |
113 | ||
5fd9cbad TH |
114 | ret = ttm_mem_global_alloc_page(mem_glob, p, false, false); |
115 | if (unlikely(ret != 0)) | |
116 | goto out_err; | |
117 | ||
118 | if (PageHighMem(p)) | |
ba4e7d97 | 119 | ttm->pages[--ttm->first_himem_page] = p; |
5fd9cbad | 120 | else |
ba4e7d97 | 121 | ttm->pages[++ttm->last_lomem_page] = p; |
ba4e7d97 TH |
122 | } |
123 | return p; | |
124 | out_err: | |
125 | put_page(p); | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index) | |
130 | { | |
131 | int ret; | |
132 | ||
133 | if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { | |
134 | ret = ttm_tt_swapin(ttm); | |
135 | if (unlikely(ret != 0)) | |
136 | return NULL; | |
137 | } | |
138 | return __ttm_tt_get_page(ttm, index); | |
139 | } | |
140 | ||
141 | int ttm_tt_populate(struct ttm_tt *ttm) | |
142 | { | |
143 | struct page *page; | |
144 | unsigned long i; | |
145 | struct ttm_backend *be; | |
146 | int ret; | |
147 | ||
148 | if (ttm->state != tt_unpopulated) | |
149 | return 0; | |
150 | ||
151 | if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { | |
152 | ret = ttm_tt_swapin(ttm); | |
153 | if (unlikely(ret != 0)) | |
154 | return ret; | |
155 | } | |
156 | ||
157 | be = ttm->be; | |
158 | ||
159 | for (i = 0; i < ttm->num_pages; ++i) { | |
160 | page = __ttm_tt_get_page(ttm, i); | |
161 | if (!page) | |
162 | return -ENOMEM; | |
163 | } | |
164 | ||
165 | be->func->populate(be, ttm->num_pages, ttm->pages, | |
166 | ttm->dummy_read_page); | |
167 | ttm->state = tt_unbound; | |
168 | return 0; | |
169 | } | |
4bfd75cb | 170 | EXPORT_SYMBOL(ttm_tt_populate); |
ba4e7d97 TH |
171 | |
172 | #ifdef CONFIG_X86 | |
173 | static inline int ttm_tt_set_page_caching(struct page *p, | |
f0e2f38b FJ |
174 | enum ttm_caching_state c_old, |
175 | enum ttm_caching_state c_new) | |
ba4e7d97 | 176 | { |
db78e27d FJ |
177 | int ret = 0; |
178 | ||
ba4e7d97 TH |
179 | if (PageHighMem(p)) |
180 | return 0; | |
181 | ||
f0e2f38b | 182 | if (c_old != tt_cached) { |
db78e27d FJ |
183 | /* p isn't in the default caching state, set it to |
184 | * writeback first to free its current memtype. */ | |
185 | ||
186 | ret = set_pages_wb(p, 1); | |
187 | if (ret) | |
188 | return ret; | |
ba4e7d97 | 189 | } |
db78e27d | 190 | |
f0e2f38b | 191 | if (c_new == tt_wc) |
db78e27d | 192 | ret = set_memory_wc((unsigned long) page_address(p), 1); |
f0e2f38b | 193 | else if (c_new == tt_uncached) |
db78e27d FJ |
194 | ret = set_pages_uc(p, 1); |
195 | ||
196 | return ret; | |
ba4e7d97 TH |
197 | } |
198 | #else /* CONFIG_X86 */ | |
199 | static inline int ttm_tt_set_page_caching(struct page *p, | |
f0e2f38b FJ |
200 | enum ttm_caching_state c_old, |
201 | enum ttm_caching_state c_new) | |
ba4e7d97 TH |
202 | { |
203 | return 0; | |
204 | } | |
205 | #endif /* CONFIG_X86 */ | |
206 | ||
207 | /* | |
208 | * Change caching policy for the linear kernel map | |
209 | * for range of pages in a ttm. | |
210 | */ | |
211 | ||
212 | static int ttm_tt_set_caching(struct ttm_tt *ttm, | |
213 | enum ttm_caching_state c_state) | |
214 | { | |
215 | int i, j; | |
216 | struct page *cur_page; | |
217 | int ret; | |
218 | ||
219 | if (ttm->caching_state == c_state) | |
220 | return 0; | |
221 | ||
1403b1a3 PN |
222 | if (ttm->state == tt_unpopulated) { |
223 | /* Change caching but don't populate */ | |
224 | ttm->caching_state = c_state; | |
225 | return 0; | |
ba4e7d97 TH |
226 | } |
227 | ||
228 | if (ttm->caching_state == tt_cached) | |
c9c97b8c | 229 | drm_clflush_pages(ttm->pages, ttm->num_pages); |
ba4e7d97 TH |
230 | |
231 | for (i = 0; i < ttm->num_pages; ++i) { | |
232 | cur_page = ttm->pages[i]; | |
233 | if (likely(cur_page != NULL)) { | |
f0e2f38b FJ |
234 | ret = ttm_tt_set_page_caching(cur_page, |
235 | ttm->caching_state, | |
236 | c_state); | |
ba4e7d97 TH |
237 | if (unlikely(ret != 0)) |
238 | goto out_err; | |
239 | } | |
240 | } | |
241 | ||
242 | ttm->caching_state = c_state; | |
243 | ||
244 | return 0; | |
245 | ||
246 | out_err: | |
247 | for (j = 0; j < i; ++j) { | |
248 | cur_page = ttm->pages[j]; | |
249 | if (likely(cur_page != NULL)) { | |
f0e2f38b | 250 | (void)ttm_tt_set_page_caching(cur_page, c_state, |
ba4e7d97 TH |
251 | ttm->caching_state); |
252 | } | |
253 | } | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) | |
259 | { | |
260 | enum ttm_caching_state state; | |
261 | ||
262 | if (placement & TTM_PL_FLAG_WC) | |
263 | state = tt_wc; | |
264 | else if (placement & TTM_PL_FLAG_UNCACHED) | |
265 | state = tt_uncached; | |
266 | else | |
267 | state = tt_cached; | |
268 | ||
269 | return ttm_tt_set_caching(ttm, state); | |
270 | } | |
df67bed9 | 271 | EXPORT_SYMBOL(ttm_tt_set_placement_caching); |
ba4e7d97 TH |
272 | |
273 | static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm) | |
274 | { | |
275 | int i; | |
1403b1a3 PN |
276 | unsigned count = 0; |
277 | struct list_head h; | |
ba4e7d97 TH |
278 | struct page *cur_page; |
279 | struct ttm_backend *be = ttm->be; | |
280 | ||
1403b1a3 PN |
281 | INIT_LIST_HEAD(&h); |
282 | ||
ba4e7d97 TH |
283 | if (be) |
284 | be->func->clear(be); | |
ba4e7d97 | 285 | for (i = 0; i < ttm->num_pages; ++i) { |
1403b1a3 | 286 | |
ba4e7d97 TH |
287 | cur_page = ttm->pages[i]; |
288 | ttm->pages[i] = NULL; | |
289 | if (cur_page) { | |
290 | if (page_count(cur_page) != 1) | |
291 | printk(KERN_ERR TTM_PFX | |
292 | "Erroneous page count. " | |
293 | "Leaking pages.\n"); | |
a987fcaa | 294 | ttm_mem_global_free_page(ttm->glob->mem_glob, |
5fd9cbad | 295 | cur_page); |
1403b1a3 PN |
296 | list_add(&cur_page->lru, &h); |
297 | count++; | |
ba4e7d97 TH |
298 | } |
299 | } | |
1403b1a3 | 300 | ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state); |
ba4e7d97 TH |
301 | ttm->state = tt_unpopulated; |
302 | ttm->first_himem_page = ttm->num_pages; | |
303 | ttm->last_lomem_page = -1; | |
304 | } | |
305 | ||
306 | void ttm_tt_destroy(struct ttm_tt *ttm) | |
307 | { | |
308 | struct ttm_backend *be; | |
309 | ||
310 | if (unlikely(ttm == NULL)) | |
311 | return; | |
312 | ||
313 | be = ttm->be; | |
314 | if (likely(be != NULL)) { | |
315 | be->func->destroy(be); | |
316 | ttm->be = NULL; | |
317 | } | |
318 | ||
319 | if (likely(ttm->pages != NULL)) { | |
320 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) | |
321 | ttm_tt_free_user_pages(ttm); | |
322 | else | |
323 | ttm_tt_free_alloced_pages(ttm); | |
324 | ||
325 | ttm_tt_free_page_directory(ttm); | |
326 | } | |
327 | ||
328 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) && | |
329 | ttm->swap_storage) | |
330 | fput(ttm->swap_storage); | |
331 | ||
332 | kfree(ttm); | |
333 | } | |
334 | ||
335 | int ttm_tt_set_user(struct ttm_tt *ttm, | |
336 | struct task_struct *tsk, | |
337 | unsigned long start, unsigned long num_pages) | |
338 | { | |
339 | struct mm_struct *mm = tsk->mm; | |
340 | int ret; | |
341 | int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0; | |
a987fcaa | 342 | struct ttm_mem_global *mem_glob = ttm->glob->mem_glob; |
ba4e7d97 TH |
343 | |
344 | BUG_ON(num_pages != ttm->num_pages); | |
345 | BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0); | |
346 | ||
347 | /** | |
348 | * Account user pages as lowmem pages for now. | |
349 | */ | |
350 | ||
351 | ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE, | |
5fd9cbad | 352 | false, false); |
ba4e7d97 TH |
353 | if (unlikely(ret != 0)) |
354 | return ret; | |
355 | ||
356 | down_read(&mm->mmap_sem); | |
357 | ret = get_user_pages(tsk, mm, start, num_pages, | |
358 | write, 0, ttm->pages, NULL); | |
359 | up_read(&mm->mmap_sem); | |
360 | ||
361 | if (ret != num_pages && write) { | |
362 | ttm_tt_free_user_pages(ttm); | |
5fd9cbad | 363 | ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE); |
ba4e7d97 TH |
364 | return -ENOMEM; |
365 | } | |
366 | ||
367 | ttm->tsk = tsk; | |
368 | ttm->start = start; | |
369 | ttm->state = tt_unbound; | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size, | |
375 | uint32_t page_flags, struct page *dummy_read_page) | |
376 | { | |
377 | struct ttm_bo_driver *bo_driver = bdev->driver; | |
378 | struct ttm_tt *ttm; | |
379 | ||
380 | if (!bo_driver) | |
381 | return NULL; | |
382 | ||
383 | ttm = kzalloc(sizeof(*ttm), GFP_KERNEL); | |
384 | if (!ttm) | |
385 | return NULL; | |
386 | ||
a987fcaa | 387 | ttm->glob = bdev->glob; |
ba4e7d97 TH |
388 | ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
389 | ttm->first_himem_page = ttm->num_pages; | |
390 | ttm->last_lomem_page = -1; | |
391 | ttm->caching_state = tt_cached; | |
392 | ttm->page_flags = page_flags; | |
393 | ||
394 | ttm->dummy_read_page = dummy_read_page; | |
395 | ||
396 | ttm_tt_alloc_page_directory(ttm); | |
397 | if (!ttm->pages) { | |
398 | ttm_tt_destroy(ttm); | |
399 | printk(KERN_ERR TTM_PFX "Failed allocating page table\n"); | |
400 | return NULL; | |
401 | } | |
402 | ttm->be = bo_driver->create_ttm_backend_entry(bdev); | |
403 | if (!ttm->be) { | |
404 | ttm_tt_destroy(ttm); | |
405 | printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n"); | |
406 | return NULL; | |
407 | } | |
408 | ttm->state = tt_unpopulated; | |
409 | return ttm; | |
410 | } | |
411 | ||
412 | void ttm_tt_unbind(struct ttm_tt *ttm) | |
413 | { | |
414 | int ret; | |
415 | struct ttm_backend *be = ttm->be; | |
416 | ||
417 | if (ttm->state == tt_bound) { | |
418 | ret = be->func->unbind(be); | |
419 | BUG_ON(ret); | |
420 | ttm->state = tt_unbound; | |
421 | } | |
422 | } | |
423 | ||
424 | int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) | |
425 | { | |
426 | int ret = 0; | |
427 | struct ttm_backend *be; | |
428 | ||
429 | if (!ttm) | |
430 | return -EINVAL; | |
431 | ||
432 | if (ttm->state == tt_bound) | |
433 | return 0; | |
434 | ||
435 | be = ttm->be; | |
436 | ||
437 | ret = ttm_tt_populate(ttm); | |
438 | if (ret) | |
439 | return ret; | |
440 | ||
441 | ret = be->func->bind(be, bo_mem); | |
442 | if (ret) { | |
443 | printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n"); | |
444 | return ret; | |
445 | } | |
446 | ||
447 | ttm->state = tt_bound; | |
448 | ||
449 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) | |
450 | ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY; | |
451 | return 0; | |
452 | } | |
453 | EXPORT_SYMBOL(ttm_tt_bind); | |
454 | ||
455 | static int ttm_tt_swapin(struct ttm_tt *ttm) | |
456 | { | |
457 | struct address_space *swap_space; | |
458 | struct file *swap_storage; | |
459 | struct page *from_page; | |
460 | struct page *to_page; | |
461 | void *from_virtual; | |
462 | void *to_virtual; | |
463 | int i; | |
290e5505 | 464 | int ret = -ENOMEM; |
ba4e7d97 TH |
465 | |
466 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) { | |
467 | ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start, | |
468 | ttm->num_pages); | |
469 | if (unlikely(ret != 0)) | |
470 | return ret; | |
471 | ||
472 | ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; | |
473 | return 0; | |
474 | } | |
475 | ||
476 | swap_storage = ttm->swap_storage; | |
477 | BUG_ON(swap_storage == NULL); | |
478 | ||
479 | swap_space = swap_storage->f_path.dentry->d_inode->i_mapping; | |
480 | ||
481 | for (i = 0; i < ttm->num_pages; ++i) { | |
482 | from_page = read_mapping_page(swap_space, i, NULL); | |
290e5505 MM |
483 | if (IS_ERR(from_page)) { |
484 | ret = PTR_ERR(from_page); | |
ba4e7d97 | 485 | goto out_err; |
290e5505 | 486 | } |
ba4e7d97 TH |
487 | to_page = __ttm_tt_get_page(ttm, i); |
488 | if (unlikely(to_page == NULL)) | |
489 | goto out_err; | |
490 | ||
491 | preempt_disable(); | |
492 | from_virtual = kmap_atomic(from_page, KM_USER0); | |
493 | to_virtual = kmap_atomic(to_page, KM_USER1); | |
494 | memcpy(to_virtual, from_virtual, PAGE_SIZE); | |
495 | kunmap_atomic(to_virtual, KM_USER1); | |
496 | kunmap_atomic(from_virtual, KM_USER0); | |
497 | preempt_enable(); | |
498 | page_cache_release(from_page); | |
499 | } | |
500 | ||
501 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP)) | |
502 | fput(swap_storage); | |
503 | ttm->swap_storage = NULL; | |
504 | ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; | |
505 | ||
506 | return 0; | |
507 | out_err: | |
508 | ttm_tt_free_alloced_pages(ttm); | |
290e5505 | 509 | return ret; |
ba4e7d97 TH |
510 | } |
511 | ||
512 | int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage) | |
513 | { | |
514 | struct address_space *swap_space; | |
515 | struct file *swap_storage; | |
516 | struct page *from_page; | |
517 | struct page *to_page; | |
518 | void *from_virtual; | |
519 | void *to_virtual; | |
520 | int i; | |
290e5505 | 521 | int ret = -ENOMEM; |
ba4e7d97 TH |
522 | |
523 | BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); | |
524 | BUG_ON(ttm->caching_state != tt_cached); | |
525 | ||
526 | /* | |
527 | * For user buffers, just unpin the pages, as there should be | |
528 | * vma references. | |
529 | */ | |
530 | ||
531 | if (ttm->page_flags & TTM_PAGE_FLAG_USER) { | |
532 | ttm_tt_free_user_pages(ttm); | |
533 | ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; | |
534 | ttm->swap_storage = NULL; | |
535 | return 0; | |
536 | } | |
537 | ||
538 | if (!persistant_swap_storage) { | |
539 | swap_storage = shmem_file_setup("ttm swap", | |
540 | ttm->num_pages << PAGE_SHIFT, | |
541 | 0); | |
542 | if (unlikely(IS_ERR(swap_storage))) { | |
543 | printk(KERN_ERR "Failed allocating swap storage.\n"); | |
290e5505 | 544 | return PTR_ERR(swap_storage); |
ba4e7d97 TH |
545 | } |
546 | } else | |
547 | swap_storage = persistant_swap_storage; | |
548 | ||
549 | swap_space = swap_storage->f_path.dentry->d_inode->i_mapping; | |
550 | ||
551 | for (i = 0; i < ttm->num_pages; ++i) { | |
552 | from_page = ttm->pages[i]; | |
553 | if (unlikely(from_page == NULL)) | |
554 | continue; | |
555 | to_page = read_mapping_page(swap_space, i, NULL); | |
290e5505 MM |
556 | if (unlikely(IS_ERR(to_page))) { |
557 | ret = PTR_ERR(to_page); | |
ba4e7d97 | 558 | goto out_err; |
290e5505 | 559 | } |
ba4e7d97 TH |
560 | preempt_disable(); |
561 | from_virtual = kmap_atomic(from_page, KM_USER0); | |
562 | to_virtual = kmap_atomic(to_page, KM_USER1); | |
563 | memcpy(to_virtual, from_virtual, PAGE_SIZE); | |
564 | kunmap_atomic(to_virtual, KM_USER1); | |
565 | kunmap_atomic(from_virtual, KM_USER0); | |
566 | preempt_enable(); | |
567 | set_page_dirty(to_page); | |
568 | mark_page_accessed(to_page); | |
569 | page_cache_release(to_page); | |
570 | } | |
571 | ||
572 | ttm_tt_free_alloced_pages(ttm); | |
573 | ttm->swap_storage = swap_storage; | |
574 | ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; | |
575 | if (persistant_swap_storage) | |
576 | ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP; | |
577 | ||
578 | return 0; | |
579 | out_err: | |
580 | if (!persistant_swap_storage) | |
581 | fput(swap_storage); | |
582 | ||
290e5505 | 583 | return ret; |
ba4e7d97 | 584 | } |