blob: a55ee1a56c167a0dde9c53fc492deee1a61096bc [file] [log] [blame]
Thomas Hellstromba4e7d92009-06-10 15:20:19 +02001/**************************************************************************
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
Thomas Hellstromba4e7d92009-06-10 15:20:19 +020031#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>
Dave Airliec9c97b82009-08-27 09:53:47 +100037#include "drm_cache.h"
Thomas Hellstromba4e7d92009-06-10 15:20:19 +020038#include "ttm/ttm_module.h"
39#include "ttm/ttm_bo_driver.h"
40#include "ttm/ttm_placement.h"
41
42static int ttm_tt_swapin(struct ttm_tt *ttm);
43
Thomas Hellstromba4e7d92009-06-10 15:20:19 +020044/**
45 * Allocates storage for pointers to the pages that back the ttm.
46 *
47 * Uses kmalloc if possible. Otherwise falls back to vmalloc.
48 */
49static 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
64static 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
75static struct page *ttm_tt_alloc_page(unsigned page_flags)
76{
Dave Airlieb42db2b2009-07-29 16:56:52 +100077 gfp_t gfp_flags = GFP_USER;
Thomas Hellstromba4e7d92009-06-10 15:20:19 +020078
Dave Airliead49f502009-07-10 22:36:26 +100079 if (page_flags & TTM_PAGE_FLAG_ZERO_ALLOC)
80 gfp_flags |= __GFP_ZERO;
81
82 if (page_flags & TTM_PAGE_FLAG_DMA32)
83 gfp_flags |= __GFP_DMA32;
Dave Airlieb42db2b2009-07-29 16:56:52 +100084 else
85 gfp_flags |= __GFP_HIGHMEM;
Dave Airliead49f502009-07-10 22:36:26 +100086
87 return alloc_page(gfp_flags);
Thomas Hellstromba4e7d92009-06-10 15:20:19 +020088}
89
90static 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;
Thomas Hellstroma987fca2009-08-18 16:51:56 +0200119 ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE);
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200120 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
127static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
128{
129 struct page *p;
Thomas Hellstroma987fca2009-08-18 16:51:56 +0200130 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200131 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
Thomas Hellstrom5fd9cba2009-08-17 16:28:39 +0200139 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))
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200144 ttm->pages[--ttm->first_himem_page] = p;
Thomas Hellstrom5fd9cba2009-08-17 16:28:39 +0200145 else
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200146 ttm->pages[++ttm->last_lomem_page] = p;
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200147 }
148 return p;
149out_err:
150 put_page(p);
151 return NULL;
152}
153
154struct 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
166int 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}
195
196#ifdef CONFIG_X86
197static inline int ttm_tt_set_page_caching(struct page *p,
198 enum ttm_caching_state c_state)
199{
200 if (PageHighMem(p))
201 return 0;
202
203 switch (c_state) {
204 case tt_cached:
205 return set_pages_wb(p, 1);
206 case tt_wc:
207 return set_memory_wc((unsigned long) page_address(p), 1);
208 default:
209 return set_pages_uc(p, 1);
210 }
211}
212#else /* CONFIG_X86 */
213static inline int ttm_tt_set_page_caching(struct page *p,
214 enum ttm_caching_state c_state)
215{
216 return 0;
217}
218#endif /* CONFIG_X86 */
219
220/*
221 * Change caching policy for the linear kernel map
222 * for range of pages in a ttm.
223 */
224
225static int ttm_tt_set_caching(struct ttm_tt *ttm,
226 enum ttm_caching_state c_state)
227{
228 int i, j;
229 struct page *cur_page;
230 int ret;
231
232 if (ttm->caching_state == c_state)
233 return 0;
234
235 if (c_state != tt_cached) {
236 ret = ttm_tt_populate(ttm);
237 if (unlikely(ret != 0))
238 return ret;
239 }
240
241 if (ttm->caching_state == tt_cached)
Dave Airliec9c97b82009-08-27 09:53:47 +1000242 drm_clflush_pages(ttm->pages, ttm->num_pages);
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200243
244 for (i = 0; i < ttm->num_pages; ++i) {
245 cur_page = ttm->pages[i];
246 if (likely(cur_page != NULL)) {
247 ret = ttm_tt_set_page_caching(cur_page, c_state);
248 if (unlikely(ret != 0))
249 goto out_err;
250 }
251 }
252
253 ttm->caching_state = c_state;
254
255 return 0;
256
257out_err:
258 for (j = 0; j < i; ++j) {
259 cur_page = ttm->pages[j];
260 if (likely(cur_page != NULL)) {
261 (void)ttm_tt_set_page_caching(cur_page,
262 ttm->caching_state);
263 }
264 }
265
266 return ret;
267}
268
269int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
270{
271 enum ttm_caching_state state;
272
273 if (placement & TTM_PL_FLAG_WC)
274 state = tt_wc;
275 else if (placement & TTM_PL_FLAG_UNCACHED)
276 state = tt_uncached;
277 else
278 state = tt_cached;
279
280 return ttm_tt_set_caching(ttm, state);
281}
282
283static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
284{
285 int i;
286 struct page *cur_page;
287 struct ttm_backend *be = ttm->be;
288
289 if (be)
290 be->func->clear(be);
291 (void)ttm_tt_set_caching(ttm, tt_cached);
292 for (i = 0; i < ttm->num_pages; ++i) {
293 cur_page = ttm->pages[i];
294 ttm->pages[i] = NULL;
295 if (cur_page) {
296 if (page_count(cur_page) != 1)
297 printk(KERN_ERR TTM_PFX
298 "Erroneous page count. "
299 "Leaking pages.\n");
Thomas Hellstroma987fca2009-08-18 16:51:56 +0200300 ttm_mem_global_free_page(ttm->glob->mem_glob,
Thomas Hellstrom5fd9cba2009-08-17 16:28:39 +0200301 cur_page);
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200302 __free_page(cur_page);
303 }
304 }
305 ttm->state = tt_unpopulated;
306 ttm->first_himem_page = ttm->num_pages;
307 ttm->last_lomem_page = -1;
308}
309
310void ttm_tt_destroy(struct ttm_tt *ttm)
311{
312 struct ttm_backend *be;
313
314 if (unlikely(ttm == NULL))
315 return;
316
317 be = ttm->be;
318 if (likely(be != NULL)) {
319 be->func->destroy(be);
320 ttm->be = NULL;
321 }
322
323 if (likely(ttm->pages != NULL)) {
324 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
325 ttm_tt_free_user_pages(ttm);
326 else
327 ttm_tt_free_alloced_pages(ttm);
328
329 ttm_tt_free_page_directory(ttm);
330 }
331
332 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) &&
333 ttm->swap_storage)
334 fput(ttm->swap_storage);
335
336 kfree(ttm);
337}
338
339int ttm_tt_set_user(struct ttm_tt *ttm,
340 struct task_struct *tsk,
341 unsigned long start, unsigned long num_pages)
342{
343 struct mm_struct *mm = tsk->mm;
344 int ret;
345 int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
Thomas Hellstroma987fca2009-08-18 16:51:56 +0200346 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200347
348 BUG_ON(num_pages != ttm->num_pages);
349 BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
350
351 /**
352 * Account user pages as lowmem pages for now.
353 */
354
355 ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
Thomas Hellstrom5fd9cba2009-08-17 16:28:39 +0200356 false, false);
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200357 if (unlikely(ret != 0))
358 return ret;
359
360 down_read(&mm->mmap_sem);
361 ret = get_user_pages(tsk, mm, start, num_pages,
362 write, 0, ttm->pages, NULL);
363 up_read(&mm->mmap_sem);
364
365 if (ret != num_pages && write) {
366 ttm_tt_free_user_pages(ttm);
Thomas Hellstrom5fd9cba2009-08-17 16:28:39 +0200367 ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE);
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200368 return -ENOMEM;
369 }
370
371 ttm->tsk = tsk;
372 ttm->start = start;
373 ttm->state = tt_unbound;
374
375 return 0;
376}
377
378struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
379 uint32_t page_flags, struct page *dummy_read_page)
380{
381 struct ttm_bo_driver *bo_driver = bdev->driver;
382 struct ttm_tt *ttm;
383
384 if (!bo_driver)
385 return NULL;
386
387 ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
388 if (!ttm)
389 return NULL;
390
Thomas Hellstroma987fca2009-08-18 16:51:56 +0200391 ttm->glob = bdev->glob;
Thomas Hellstromba4e7d92009-06-10 15:20:19 +0200392 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
393 ttm->first_himem_page = ttm->num_pages;
394 ttm->last_lomem_page = -1;
395 ttm->caching_state = tt_cached;
396 ttm->page_flags = page_flags;
397
398 ttm->dummy_read_page = dummy_read_page;
399
400 ttm_tt_alloc_page_directory(ttm);
401 if (!ttm->pages) {
402 ttm_tt_destroy(ttm);
403 printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
404 return NULL;
405 }
406 ttm->be = bo_driver->create_ttm_backend_entry(bdev);
407 if (!ttm->be) {
408 ttm_tt_destroy(ttm);
409 printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n");
410 return NULL;
411 }
412 ttm->state = tt_unpopulated;
413 return ttm;
414}
415
416void ttm_tt_unbind(struct ttm_tt *ttm)
417{
418 int ret;
419 struct ttm_backend *be = ttm->be;
420
421 if (ttm->state == tt_bound) {
422 ret = be->func->unbind(be);
423 BUG_ON(ret);
424 ttm->state = tt_unbound;
425 }
426}
427
428int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
429{
430 int ret = 0;
431 struct ttm_backend *be;
432
433 if (!ttm)
434 return -EINVAL;
435
436 if (ttm->state == tt_bound)
437 return 0;
438
439 be = ttm->be;
440
441 ret = ttm_tt_populate(ttm);
442 if (ret)
443 return ret;
444
445 ret = be->func->bind(be, bo_mem);
446 if (ret) {
447 printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n");
448 return ret;
449 }
450
451 ttm->state = tt_bound;
452
453 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
454 ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
455 return 0;
456}
457EXPORT_SYMBOL(ttm_tt_bind);
458
459static int ttm_tt_swapin(struct ttm_tt *ttm)
460{
461 struct address_space *swap_space;
462 struct file *swap_storage;
463 struct page *from_page;
464 struct page *to_page;
465 void *from_virtual;
466 void *to_virtual;
467 int i;
468 int ret;
469
470 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
471 ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
472 ttm->num_pages);
473 if (unlikely(ret != 0))
474 return ret;
475
476 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
477 return 0;
478 }
479
480 swap_storage = ttm->swap_storage;
481 BUG_ON(swap_storage == NULL);
482
483 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
484
485 for (i = 0; i < ttm->num_pages; ++i) {
486 from_page = read_mapping_page(swap_space, i, NULL);
487 if (IS_ERR(from_page))
488 goto out_err;
489 to_page = __ttm_tt_get_page(ttm, i);
490 if (unlikely(to_page == NULL))
491 goto out_err;
492
493 preempt_disable();
494 from_virtual = kmap_atomic(from_page, KM_USER0);
495 to_virtual = kmap_atomic(to_page, KM_USER1);
496 memcpy(to_virtual, from_virtual, PAGE_SIZE);
497 kunmap_atomic(to_virtual, KM_USER1);
498 kunmap_atomic(from_virtual, KM_USER0);
499 preempt_enable();
500 page_cache_release(from_page);
501 }
502
503 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP))
504 fput(swap_storage);
505 ttm->swap_storage = NULL;
506 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
507
508 return 0;
509out_err:
510 ttm_tt_free_alloced_pages(ttm);
511 return -ENOMEM;
512}
513
514int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage)
515{
516 struct address_space *swap_space;
517 struct file *swap_storage;
518 struct page *from_page;
519 struct page *to_page;
520 void *from_virtual;
521 void *to_virtual;
522 int i;
523
524 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
525 BUG_ON(ttm->caching_state != tt_cached);
526
527 /*
528 * For user buffers, just unpin the pages, as there should be
529 * vma references.
530 */
531
532 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
533 ttm_tt_free_user_pages(ttm);
534 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
535 ttm->swap_storage = NULL;
536 return 0;
537 }
538
539 if (!persistant_swap_storage) {
540 swap_storage = shmem_file_setup("ttm swap",
541 ttm->num_pages << PAGE_SHIFT,
542 0);
543 if (unlikely(IS_ERR(swap_storage))) {
544 printk(KERN_ERR "Failed allocating swap storage.\n");
545 return -ENOMEM;
546 }
547 } else
548 swap_storage = persistant_swap_storage;
549
550 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
551
552 for (i = 0; i < ttm->num_pages; ++i) {
553 from_page = ttm->pages[i];
554 if (unlikely(from_page == NULL))
555 continue;
556 to_page = read_mapping_page(swap_space, i, NULL);
557 if (unlikely(to_page == NULL))
558 goto out_err;
559
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;
579out_err:
580 if (!persistant_swap_storage)
581 fput(swap_storage);
582
583 return -ENOMEM;
584}