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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>
37#include "drm_cache.h"
38#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
44
45
46
47
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{
77 gfp_t gfp_flags = GFP_USER;
78
79 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;
84 else
85 gfp_flags |= __GFP_HIGHMEM;
86
87 return alloc_page(gfp_flags);
88}
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;
119 ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE);
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
127static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
128{
129 struct page *p;
130 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
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
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))
144 ttm->pages[--ttm->first_himem_page] = p;
145 else
146 ttm->pages[++ttm->last_lomem_page] = p;
147 }
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
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
219
220
221
222
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)
242 drm_clflush_pages(ttm->pages, ttm->num_pages);
243
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}
282EXPORT_SYMBOL(ttm_tt_set_placement_caching);
283
284static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
285{
286 int i;
287 struct page *cur_page;
288 struct ttm_backend *be = ttm->be;
289
290 if (be)
291 be->func->clear(be);
292 (void)ttm_tt_set_caching(ttm, tt_cached);
293 for (i = 0; i < ttm->num_pages; ++i) {
294 cur_page = ttm->pages[i];
295 ttm->pages[i] = NULL;
296 if (cur_page) {
297 if (page_count(cur_page) != 1)
298 printk(KERN_ERR TTM_PFX
299 "Erroneous page count. "
300 "Leaking pages.\n");
301 ttm_mem_global_free_page(ttm->glob->mem_glob,
302 cur_page);
303 __free_page(cur_page);
304 }
305 }
306 ttm->state = tt_unpopulated;
307 ttm->first_himem_page = ttm->num_pages;
308 ttm->last_lomem_page = -1;
309}
310
311void ttm_tt_destroy(struct ttm_tt *ttm)
312{
313 struct ttm_backend *be;
314
315 if (unlikely(ttm == NULL))
316 return;
317
318 be = ttm->be;
319 if (likely(be != NULL)) {
320 be->func->destroy(be);
321 ttm->be = NULL;
322 }
323
324 if (likely(ttm->pages != NULL)) {
325 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
326 ttm_tt_free_user_pages(ttm);
327 else
328 ttm_tt_free_alloced_pages(ttm);
329
330 ttm_tt_free_page_directory(ttm);
331 }
332
333 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) &&
334 ttm->swap_storage)
335 fput(ttm->swap_storage);
336
337 kfree(ttm);
338}
339
340int ttm_tt_set_user(struct ttm_tt *ttm,
341 struct task_struct *tsk,
342 unsigned long start, unsigned long num_pages)
343{
344 struct mm_struct *mm = tsk->mm;
345 int ret;
346 int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
347 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
348
349 BUG_ON(num_pages != ttm->num_pages);
350 BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
351
352
353
354
355
356 ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
357 false, false);
358 if (unlikely(ret != 0))
359 return ret;
360
361 down_read(&mm->mmap_sem);
362 ret = get_user_pages(tsk, mm, start, num_pages,
363 write, 0, ttm->pages, NULL);
364 up_read(&mm->mmap_sem);
365
366 if (ret != num_pages && write) {
367 ttm_tt_free_user_pages(ttm);
368 ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE);
369 return -ENOMEM;
370 }
371
372 ttm->tsk = tsk;
373 ttm->start = start;
374 ttm->state = tt_unbound;
375
376 return 0;
377}
378
379struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
380 uint32_t page_flags, struct page *dummy_read_page)
381{
382 struct ttm_bo_driver *bo_driver = bdev->driver;
383 struct ttm_tt *ttm;
384
385 if (!bo_driver)
386 return NULL;
387
388 ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
389 if (!ttm)
390 return NULL;
391
392 ttm->glob = bdev->glob;
393 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
394 ttm->first_himem_page = ttm->num_pages;
395 ttm->last_lomem_page = -1;
396 ttm->caching_state = tt_cached;
397 ttm->page_flags = page_flags;
398
399 ttm->dummy_read_page = dummy_read_page;
400
401 ttm_tt_alloc_page_directory(ttm);
402 if (!ttm->pages) {
403 ttm_tt_destroy(ttm);
404 printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
405 return NULL;
406 }
407 ttm->be = bo_driver->create_ttm_backend_entry(bdev);
408 if (!ttm->be) {
409 ttm_tt_destroy(ttm);
410 printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n");
411 return NULL;
412 }
413 ttm->state = tt_unpopulated;
414 return ttm;
415}
416
417void ttm_tt_unbind(struct ttm_tt *ttm)
418{
419 int ret;
420 struct ttm_backend *be = ttm->be;
421
422 if (ttm->state == tt_bound) {
423 ret = be->func->unbind(be);
424 BUG_ON(ret);
425 ttm->state = tt_unbound;
426 }
427}
428
429int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
430{
431 int ret = 0;
432 struct ttm_backend *be;
433
434 if (!ttm)
435 return -EINVAL;
436
437 if (ttm->state == tt_bound)
438 return 0;
439
440 be = ttm->be;
441
442 ret = ttm_tt_populate(ttm);
443 if (ret)
444 return ret;
445
446 ret = be->func->bind(be, bo_mem);
447 if (ret) {
448 printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n");
449 return ret;
450 }
451
452 ttm->state = tt_bound;
453
454 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
455 ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
456 return 0;
457}
458EXPORT_SYMBOL(ttm_tt_bind);
459
460static int ttm_tt_swapin(struct ttm_tt *ttm)
461{
462 struct address_space *swap_space;
463 struct file *swap_storage;
464 struct page *from_page;
465 struct page *to_page;
466 void *from_virtual;
467 void *to_virtual;
468 int i;
469 int ret;
470
471 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
472 ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
473 ttm->num_pages);
474 if (unlikely(ret != 0))
475 return ret;
476
477 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
478 return 0;
479 }
480
481 swap_storage = ttm->swap_storage;
482 BUG_ON(swap_storage == NULL);
483
484 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
485
486 for (i = 0; i < ttm->num_pages; ++i) {
487 from_page = read_mapping_page(swap_space, i, NULL);
488 if (IS_ERR(from_page))
489 goto out_err;
490 to_page = __ttm_tt_get_page(ttm, i);
491 if (unlikely(to_page == NULL))
492 goto out_err;
493
494 preempt_disable();
495 from_virtual = kmap_atomic(from_page, KM_USER0);
496 to_virtual = kmap_atomic(to_page, KM_USER1);
497 memcpy(to_virtual, from_virtual, PAGE_SIZE);
498 kunmap_atomic(to_virtual, KM_USER1);
499 kunmap_atomic(from_virtual, KM_USER0);
500 preempt_enable();
501 page_cache_release(from_page);
502 }
503
504 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP))
505 fput(swap_storage);
506 ttm->swap_storage = NULL;
507 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
508
509 return 0;
510out_err:
511 ttm_tt_free_alloced_pages(ttm);
512 return -ENOMEM;
513}
514
515int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage)
516{
517 struct address_space *swap_space;
518 struct file *swap_storage;
519 struct page *from_page;
520 struct page *to_page;
521 void *from_virtual;
522 void *to_virtual;
523 int i;
524
525 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
526 BUG_ON(ttm->caching_state != tt_cached);
527
528
529
530
531
532
533 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
534 ttm_tt_free_user_pages(ttm);
535 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
536 ttm->swap_storage = NULL;
537 return 0;
538 }
539
540 if (!persistant_swap_storage) {
541 swap_storage = shmem_file_setup("ttm swap",
542 ttm->num_pages << PAGE_SHIFT,
543 0);
544 if (unlikely(IS_ERR(swap_storage))) {
545 printk(KERN_ERR "Failed allocating swap storage.\n");
546 return -ENOMEM;
547 }
548 } else
549 swap_storage = persistant_swap_storage;
550
551 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
552
553 for (i = 0; i < ttm->num_pages; ++i) {
554 from_page = ttm->pages[i];
555 if (unlikely(from_page == NULL))
556 continue;
557 to_page = read_mapping_page(swap_space, i, NULL);
558 if (unlikely(to_page == NULL))
559 goto out_err;
560
561 preempt_disable();
562 from_virtual = kmap_atomic(from_page, KM_USER0);
563 to_virtual = kmap_atomic(to_page, KM_USER1);
564 memcpy(to_virtual, from_virtual, PAGE_SIZE);
565 kunmap_atomic(to_virtual, KM_USER1);
566 kunmap_atomic(from_virtual, KM_USER0);
567 preempt_enable();
568 set_page_dirty(to_page);
569 mark_page_accessed(to_page);
570 page_cache_release(to_page);
571 }
572
573 ttm_tt_free_alloced_pages(ttm);
574 ttm->swap_storage = swap_storage;
575 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
576 if (persistant_swap_storage)
577 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP;
578
579 return 0;
580out_err:
581 if (!persistant_swap_storage)
582 fput(swap_storage);
583
584 return -ENOMEM;
585}
586
