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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
31#include <linux/sched.h>
32#include <linux/highmem.h>
33#include <linux/pagemap.h>
34#include <linux/shmem_fs.h>
35#include <linux/file.h>
36#include <linux/swap.h>
37#include <linux/slab.h>
38#include "drm_cache.h"
39#include "drm_mem_util.h"
40#include "ttm/ttm_module.h"
41#include "ttm/ttm_bo_driver.h"
42#include "ttm/ttm_placement.h"
43#include "ttm/ttm_page_alloc.h"
44
45static int ttm_tt_swapin(struct ttm_tt *ttm);
46
47/**
48 * Allocates storage for pointers to the pages that back the ttm.
49 */
50static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
51{
52 ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(*ttm->pages));
53 ttm->dma_address = drm_calloc_large(ttm->num_pages,
54 sizeof(*ttm->dma_address));
55}
56
57static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
58{
59 drm_free_large(ttm->pages);
60 ttm->pages = NULL;
61 drm_free_large(ttm->dma_address);
62 ttm->dma_address = NULL;
63}
64
65static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
66{
67 int write;
68 int dirty;
69 struct page *page;
70 int i;
71 struct ttm_backend *be = ttm->be;
72
73 BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER));
74 write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0);
75 dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0);
76
77 if (be)
78 be->func->clear(be);
79
80 for (i = 0; i < ttm->num_pages; ++i) {
81 page = ttm->pages[i];
82 if (page == NULL)
83 continue;
84
85 if (page == ttm->dummy_read_page) {
86 BUG_ON(write);
87 continue;
88 }
89
90 if (write && dirty && !PageReserved(page))
91 set_page_dirty_lock(page);
92
93 ttm->pages[i] = NULL;
94 ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE);
95 put_page(page);
96 }
97 ttm->state = tt_unpopulated;
98 ttm->first_himem_page = ttm->num_pages;
99 ttm->last_lomem_page = -1;
100}
101
102static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
103{
104 struct page *p;
105 struct list_head h;
106 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
107 int ret;
108
109 while (NULL == (p = ttm->pages[index])) {
110
111 INIT_LIST_HEAD(&h);
112
113 ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1,
114 &ttm->dma_address[index]);
115
116 if (ret != 0)
117 return NULL;
118
119 p = list_first_entry(&h, struct page, lru);
120
121 ret = ttm_mem_global_alloc_page(mem_glob, p, false, false);
122 if (unlikely(ret != 0))
123 goto out_err;
124
125 if (PageHighMem(p))
126 ttm->pages[--ttm->first_himem_page] = p;
127 else
128 ttm->pages[++ttm->last_lomem_page] = p;
129 }
130 return p;
131out_err:
132 put_page(p);
133 return NULL;
134}
135
136struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index)
137{
138 int ret;
139
140 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
141 ret = ttm_tt_swapin(ttm);
142 if (unlikely(ret != 0))
143 return NULL;
144 }
145 return __ttm_tt_get_page(ttm, index);
146}
147
148int ttm_tt_populate(struct ttm_tt *ttm)
149{
150 struct page *page;
151 unsigned long i;
152 struct ttm_backend *be;
153 int ret;
154
155 if (ttm->state != tt_unpopulated)
156 return 0;
157
158 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
159 ret = ttm_tt_swapin(ttm);
160 if (unlikely(ret != 0))
161 return ret;
162 }
163
164 be = ttm->be;
165
166 for (i = 0; i < ttm->num_pages; ++i) {
167 page = __ttm_tt_get_page(ttm, i);
168 if (!page)
169 return -ENOMEM;
170 }
171
172 be->func->populate(be, ttm->num_pages, ttm->pages,
173 ttm->dummy_read_page, ttm->dma_address);
174 ttm->state = tt_unbound;
175 return 0;
176}
177EXPORT_SYMBOL(ttm_tt_populate);
178
179#ifdef CONFIG_X86
180static inline int ttm_tt_set_page_caching(struct page *p,
181 enum ttm_caching_state c_old,
182 enum ttm_caching_state c_new)
183{
184 int ret = 0;
185
186 if (PageHighMem(p))
187 return 0;
188
189 if (c_old != tt_cached) {
190 /* p isn't in the default caching state, set it to
191 * writeback first to free its current memtype. */
192
193 ret = set_pages_wb(p, 1);
194 if (ret)
195 return ret;
196 }
197
198 if (c_new == tt_wc)
199 ret = set_memory_wc((unsigned long) page_address(p), 1);
200 else if (c_new == tt_uncached)
201 ret = set_pages_uc(p, 1);
202
203 return ret;
204}
205#else /* CONFIG_X86 */
206static inline int ttm_tt_set_page_caching(struct page *p,
207 enum ttm_caching_state c_old,
208 enum ttm_caching_state c_new)
209{
210 return 0;
211}
212#endif /* CONFIG_X86 */
213
214/*
215 * Change caching policy for the linear kernel map
216 * for range of pages in a ttm.
217 */
218
219static int ttm_tt_set_caching(struct ttm_tt *ttm,
220 enum ttm_caching_state c_state)
221{
222 int i, j;
223 struct page *cur_page;
224 int ret;
225
226 if (ttm->caching_state == c_state)
227 return 0;
228
229 if (ttm->state == tt_unpopulated) {
230 /* Change caching but don't populate */
231 ttm->caching_state = c_state;
232 return 0;
233 }
234
235 if (ttm->caching_state == tt_cached)
236 drm_clflush_pages(ttm->pages, ttm->num_pages);
237
238 for (i = 0; i < ttm->num_pages; ++i) {
239 cur_page = ttm->pages[i];
240 if (likely(cur_page != NULL)) {
241 ret = ttm_tt_set_page_caching(cur_page,
242 ttm->caching_state,
243 c_state);
244 if (unlikely(ret != 0))
245 goto out_err;
246 }
247 }
248
249 ttm->caching_state = c_state;
250
251 return 0;
252
253out_err:
254 for (j = 0; j < i; ++j) {
255 cur_page = ttm->pages[j];
256 if (likely(cur_page != NULL)) {
257 (void)ttm_tt_set_page_caching(cur_page, c_state,
258 ttm->caching_state);
259 }
260 }
261
262 return ret;
263}
264
265int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
266{
267 enum ttm_caching_state state;
268
269 if (placement & TTM_PL_FLAG_WC)
270 state = tt_wc;
271 else if (placement & TTM_PL_FLAG_UNCACHED)
272 state = tt_uncached;
273 else
274 state = tt_cached;
275
276 return ttm_tt_set_caching(ttm, state);
277}
278EXPORT_SYMBOL(ttm_tt_set_placement_caching);
279
280static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
281{
282 int i;
283 unsigned count = 0;
284 struct list_head h;
285 struct page *cur_page;
286 struct ttm_backend *be = ttm->be;
287
288 INIT_LIST_HEAD(&h);
289
290 if (be)
291 be->func->clear(be);
292 for (i = 0; i < ttm->num_pages; ++i) {
293
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 list_add(&cur_page->lru, &h);
304 count++;
305 }
306 }
307 ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state,
308 ttm->dma_address);
309 ttm->state = tt_unpopulated;
310 ttm->first_himem_page = ttm->num_pages;
311 ttm->last_lomem_page = -1;
312}
313
314void ttm_tt_destroy(struct ttm_tt *ttm)
315{
316 struct ttm_backend *be;
317
318 if (unlikely(ttm == NULL))
319 return;
320
321 be = ttm->be;
322 if (likely(be != NULL)) {
323 be->func->destroy(be);
324 ttm->be = NULL;
325 }
326
327 if (likely(ttm->pages != NULL)) {
328 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
329 ttm_tt_free_user_pages(ttm);
330 else
331 ttm_tt_free_alloced_pages(ttm);
332
333 ttm_tt_free_page_directory(ttm);
334 }
335
336 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
337 ttm->swap_storage)
338 fput(ttm->swap_storage);
339
340 kfree(ttm);
341}
342
343int ttm_tt_set_user(struct ttm_tt *ttm,
344 struct task_struct *tsk,
345 unsigned long start, unsigned long num_pages)
346{
347 struct mm_struct *mm = tsk->mm;
348 int ret;
349 int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
350 struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
351
352 BUG_ON(num_pages != ttm->num_pages);
353 BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
354
355 /**
356 * Account user pages as lowmem pages for now.
357 */
358
359 ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
360 false, false);
361 if (unlikely(ret != 0))
362 return ret;
363
364 down_read(&mm->mmap_sem);
365 ret = get_user_pages(tsk, mm, start, num_pages,
366 write, 0, ttm->pages, NULL);
367 up_read(&mm->mmap_sem);
368
369 if (ret != num_pages && write) {
370 ttm_tt_free_user_pages(ttm);
371 ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE);
372 return -ENOMEM;
373 }
374
375 ttm->tsk = tsk;
376 ttm->start = start;
377 ttm->state = tt_unbound;
378
379 return 0;
380}
381
382struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
383 uint32_t page_flags, struct page *dummy_read_page)
384{
385 struct ttm_bo_driver *bo_driver = bdev->driver;
386 struct ttm_tt *ttm;
387
388 if (!bo_driver)
389 return NULL;
390
391 ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
392 if (!ttm)
393 return NULL;
394
395 ttm->glob = bdev->glob;
396 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
397 ttm->first_himem_page = ttm->num_pages;
398 ttm->last_lomem_page = -1;
399 ttm->caching_state = tt_cached;
400 ttm->page_flags = page_flags;
401
402 ttm->dummy_read_page = dummy_read_page;
403
404 ttm_tt_alloc_page_directory(ttm);
405 if (!ttm->pages) {
406 ttm_tt_destroy(ttm);
407 printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
408 return NULL;
409 }
410 ttm->be = bo_driver->create_ttm_backend_entry(bdev);
411 if (!ttm->be) {
412 ttm_tt_destroy(ttm);
413 printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n");
414 return NULL;
415 }
416 ttm->state = tt_unpopulated;
417 return ttm;
418}
419
420void ttm_tt_unbind(struct ttm_tt *ttm)
421{
422 int ret;
423 struct ttm_backend *be = ttm->be;
424
425 if (ttm->state == tt_bound) {
426 ret = be->func->unbind(be);
427 BUG_ON(ret);
428 ttm->state = tt_unbound;
429 }
430}
431
432int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
433{
434 int ret = 0;
435 struct ttm_backend *be;
436
437 if (!ttm)
438 return -EINVAL;
439
440 if (ttm->state == tt_bound)
441 return 0;
442
443 be = ttm->be;
444
445 ret = ttm_tt_populate(ttm);
446 if (ret)
447 return ret;
448
449 ret = be->func->bind(be, bo_mem);
450 if (unlikely(ret != 0))
451 return ret;
452
453 ttm->state = tt_bound;
454
455 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
456 ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
457 return 0;
458}
459EXPORT_SYMBOL(ttm_tt_bind);
460
461static int ttm_tt_swapin(struct ttm_tt *ttm)
462{
463 struct address_space *swap_space;
464 struct file *swap_storage;
465 struct page *from_page;
466 struct page *to_page;
467 void *from_virtual;
468 void *to_virtual;
469 int i;
470 int ret = -ENOMEM;
471
472 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
473 ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
474 ttm->num_pages);
475 if (unlikely(ret != 0))
476 return ret;
477
478 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
479 return 0;
480 }
481
482 swap_storage = ttm->swap_storage;
483 BUG_ON(swap_storage == NULL);
484
485 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
486
487 for (i = 0; i < ttm->num_pages; ++i) {
488 from_page = shmem_read_mapping_page(swap_space, i);
489 if (IS_ERR(from_page)) {
490 ret = PTR_ERR(from_page);
491 goto out_err;
492 }
493 to_page = __ttm_tt_get_page(ttm, i);
494 if (unlikely(to_page == NULL))
495 goto out_err;
496
497 preempt_disable();
498 from_virtual = kmap_atomic(from_page, KM_USER0);
499 to_virtual = kmap_atomic(to_page, KM_USER1);
500 memcpy(to_virtual, from_virtual, PAGE_SIZE);
501 kunmap_atomic(to_virtual, KM_USER1);
502 kunmap_atomic(from_virtual, KM_USER0);
503 preempt_enable();
504 page_cache_release(from_page);
505 }
506
507 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
508 fput(swap_storage);
509 ttm->swap_storage = NULL;
510 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
511
512 return 0;
513out_err:
514 ttm_tt_free_alloced_pages(ttm);
515 return ret;
516}
517
518int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
519{
520 struct address_space *swap_space;
521 struct file *swap_storage;
522 struct page *from_page;
523 struct page *to_page;
524 void *from_virtual;
525 void *to_virtual;
526 int i;
527 int ret = -ENOMEM;
528
529 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
530 BUG_ON(ttm->caching_state != tt_cached);
531
532 /*
533 * For user buffers, just unpin the pages, as there should be
534 * vma references.
535 */
536
537 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
538 ttm_tt_free_user_pages(ttm);
539 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
540 ttm->swap_storage = NULL;
541 return 0;
542 }
543
544 if (!persistent_swap_storage) {
545 swap_storage = shmem_file_setup("ttm swap",
546 ttm->num_pages << PAGE_SHIFT,
547 0);
548 if (unlikely(IS_ERR(swap_storage))) {
549 printk(KERN_ERR "Failed allocating swap storage.\n");
550 return PTR_ERR(swap_storage);
551 }
552 } else
553 swap_storage = persistent_swap_storage;
554
555 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
556
557 for (i = 0; i < ttm->num_pages; ++i) {
558 from_page = ttm->pages[i];
559 if (unlikely(from_page == NULL))
560 continue;
561 to_page = shmem_read_mapping_page(swap_space, i);
562 if (unlikely(IS_ERR(to_page))) {
563 ret = PTR_ERR(to_page);
564 goto out_err;
565 }
566 preempt_disable();
567 from_virtual = kmap_atomic(from_page, KM_USER0);
568 to_virtual = kmap_atomic(to_page, KM_USER1);
569 memcpy(to_virtual, from_virtual, PAGE_SIZE);
570 kunmap_atomic(to_virtual, KM_USER1);
571 kunmap_atomic(from_virtual, KM_USER0);
572 preempt_enable();
573 set_page_dirty(to_page);
574 mark_page_accessed(to_page);
575 page_cache_release(to_page);
576 }
577
578 ttm_tt_free_alloced_pages(ttm);
579 ttm->swap_storage = swap_storage;
580 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
581 if (persistent_swap_storage)
582 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
583
584 return 0;
585out_err:
586 if (!persistent_swap_storage)
587 fput(swap_storage);
588
589 return ret;
590}
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#define pr_fmt(fmt) "[TTM] " fmt
33
34#include <linux/sched.h>
35#include <linux/shmem_fs.h>
36#include <linux/file.h>
37#include <linux/module.h>
38#include <drm/drm_cache.h>
39#include <drm/ttm/ttm_bo.h>
40#include <drm/ttm/ttm_tt.h>
41
42#include "ttm_module.h"
43
44static unsigned long ttm_pages_limit;
45
46MODULE_PARM_DESC(pages_limit, "Limit for the allocated pages");
47module_param_named(pages_limit, ttm_pages_limit, ulong, 0644);
48
49static unsigned long ttm_dma32_pages_limit;
50
51MODULE_PARM_DESC(dma32_pages_limit, "Limit for the allocated DMA32 pages");
52module_param_named(dma32_pages_limit, ttm_dma32_pages_limit, ulong, 0644);
53
54static atomic_long_t ttm_pages_allocated;
55static atomic_long_t ttm_dma32_pages_allocated;
56
57/*
58 * Allocates a ttm structure for the given BO.
59 */
60int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
61{
62 struct ttm_device *bdev = bo->bdev;
63 uint32_t page_flags = 0;
64
65 dma_resv_assert_held(bo->base.resv);
66
67 if (bo->ttm)
68 return 0;
69
70 switch (bo->type) {
71 case ttm_bo_type_device:
72 if (zero_alloc)
73 page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
74 break;
75 case ttm_bo_type_kernel:
76 break;
77 case ttm_bo_type_sg:
78 page_flags |= TTM_TT_FLAG_EXTERNAL;
79 break;
80 default:
81 pr_err("Illegal buffer object type\n");
82 return -EINVAL;
83 }
84
85 bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
86 if (unlikely(bo->ttm == NULL))
87 return -ENOMEM;
88
89 WARN_ON(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL_MAPPABLE &&
90 !(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL));
91
92 return 0;
93}
94
95/*
96 * Allocates storage for pointers to the pages that back the ttm.
97 */
98static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
99{
100 ttm->pages = kvcalloc(ttm->num_pages, sizeof(void*), GFP_KERNEL);
101 if (!ttm->pages)
102 return -ENOMEM;
103
104 return 0;
105}
106
107static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
108{
109 ttm->pages = kvcalloc(ttm->num_pages, sizeof(*ttm->pages) +
110 sizeof(*ttm->dma_address), GFP_KERNEL);
111 if (!ttm->pages)
112 return -ENOMEM;
113
114 ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
115 return 0;
116}
117
118static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
119{
120 ttm->dma_address = kvcalloc(ttm->num_pages, sizeof(*ttm->dma_address),
121 GFP_KERNEL);
122 if (!ttm->dma_address)
123 return -ENOMEM;
124
125 return 0;
126}
127
128void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
129{
130 bdev->funcs->ttm_tt_destroy(bdev, ttm);
131}
132
133static void ttm_tt_init_fields(struct ttm_tt *ttm,
134 struct ttm_buffer_object *bo,
135 uint32_t page_flags,
136 enum ttm_caching caching,
137 unsigned long extra_pages)
138{
139 ttm->num_pages = (PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT) + extra_pages;
140 ttm->page_flags = page_flags;
141 ttm->dma_address = NULL;
142 ttm->swap_storage = NULL;
143 ttm->sg = bo->sg;
144 ttm->caching = caching;
145}
146
147int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
148 uint32_t page_flags, enum ttm_caching caching,
149 unsigned long extra_pages)
150{
151 ttm_tt_init_fields(ttm, bo, page_flags, caching, extra_pages);
152
153 if (ttm_tt_alloc_page_directory(ttm)) {
154 pr_err("Failed allocating page table\n");
155 return -ENOMEM;
156 }
157 return 0;
158}
159EXPORT_SYMBOL(ttm_tt_init);
160
161void ttm_tt_fini(struct ttm_tt *ttm)
162{
163 WARN_ON(ttm->page_flags & TTM_TT_FLAG_PRIV_POPULATED);
164
165 if (ttm->swap_storage)
166 fput(ttm->swap_storage);
167 ttm->swap_storage = NULL;
168
169 if (ttm->pages)
170 kvfree(ttm->pages);
171 else
172 kvfree(ttm->dma_address);
173 ttm->pages = NULL;
174 ttm->dma_address = NULL;
175}
176EXPORT_SYMBOL(ttm_tt_fini);
177
178int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
179 uint32_t page_flags, enum ttm_caching caching)
180{
181 int ret;
182
183 ttm_tt_init_fields(ttm, bo, page_flags, caching, 0);
184
185 if (page_flags & TTM_TT_FLAG_EXTERNAL)
186 ret = ttm_sg_tt_alloc_page_directory(ttm);
187 else
188 ret = ttm_dma_tt_alloc_page_directory(ttm);
189 if (ret) {
190 pr_err("Failed allocating page table\n");
191 return -ENOMEM;
192 }
193 return 0;
194}
195EXPORT_SYMBOL(ttm_sg_tt_init);
196
197int ttm_tt_swapin(struct ttm_tt *ttm)
198{
199 struct address_space *swap_space;
200 struct file *swap_storage;
201 struct page *from_page;
202 struct page *to_page;
203 gfp_t gfp_mask;
204 int i, ret;
205
206 swap_storage = ttm->swap_storage;
207 BUG_ON(swap_storage == NULL);
208
209 swap_space = swap_storage->f_mapping;
210 gfp_mask = mapping_gfp_mask(swap_space);
211
212 for (i = 0; i < ttm->num_pages; ++i) {
213 from_page = shmem_read_mapping_page_gfp(swap_space, i,
214 gfp_mask);
215 if (IS_ERR(from_page)) {
216 ret = PTR_ERR(from_page);
217 goto out_err;
218 }
219 to_page = ttm->pages[i];
220 if (unlikely(to_page == NULL)) {
221 ret = -ENOMEM;
222 goto out_err;
223 }
224
225 copy_highpage(to_page, from_page);
226 put_page(from_page);
227 }
228
229 fput(swap_storage);
230 ttm->swap_storage = NULL;
231 ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
232
233 return 0;
234
235out_err:
236 return ret;
237}
238
239/**
240 * ttm_tt_swapout - swap out tt object
241 *
242 * @bdev: TTM device structure.
243 * @ttm: The struct ttm_tt.
244 * @gfp_flags: Flags to use for memory allocation.
245 *
246 * Swapout a TT object to a shmem_file, return number of pages swapped out or
247 * negative error code.
248 */
249int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
250 gfp_t gfp_flags)
251{
252 loff_t size = (loff_t)ttm->num_pages << PAGE_SHIFT;
253 struct address_space *swap_space;
254 struct file *swap_storage;
255 struct page *from_page;
256 struct page *to_page;
257 int i, ret;
258
259 swap_storage = shmem_file_setup("ttm swap", size, 0);
260 if (IS_ERR(swap_storage)) {
261 pr_err("Failed allocating swap storage\n");
262 return PTR_ERR(swap_storage);
263 }
264
265 swap_space = swap_storage->f_mapping;
266 gfp_flags &= mapping_gfp_mask(swap_space);
267
268 for (i = 0; i < ttm->num_pages; ++i) {
269 from_page = ttm->pages[i];
270 if (unlikely(from_page == NULL))
271 continue;
272
273 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_flags);
274 if (IS_ERR(to_page)) {
275 ret = PTR_ERR(to_page);
276 goto out_err;
277 }
278 copy_highpage(to_page, from_page);
279 set_page_dirty(to_page);
280 mark_page_accessed(to_page);
281 put_page(to_page);
282 }
283
284 ttm_tt_unpopulate(bdev, ttm);
285 ttm->swap_storage = swap_storage;
286 ttm->page_flags |= TTM_TT_FLAG_SWAPPED;
287
288 return ttm->num_pages;
289
290out_err:
291 fput(swap_storage);
292
293 return ret;
294}
295
296int ttm_tt_populate(struct ttm_device *bdev,
297 struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
298{
299 int ret;
300
301 if (!ttm)
302 return -EINVAL;
303
304 if (ttm_tt_is_populated(ttm))
305 return 0;
306
307 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
308 atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
309 if (bdev->pool.use_dma32)
310 atomic_long_add(ttm->num_pages,
311 &ttm_dma32_pages_allocated);
312 }
313
314 while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
315 atomic_long_read(&ttm_dma32_pages_allocated) >
316 ttm_dma32_pages_limit) {
317
318 ret = ttm_global_swapout(ctx, GFP_KERNEL);
319 if (ret == 0)
320 break;
321 if (ret < 0)
322 goto error;
323 }
324
325 if (bdev->funcs->ttm_tt_populate)
326 ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
327 else
328 ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
329 if (ret)
330 goto error;
331
332 ttm->page_flags |= TTM_TT_FLAG_PRIV_POPULATED;
333 if (unlikely(ttm->page_flags & TTM_TT_FLAG_SWAPPED)) {
334 ret = ttm_tt_swapin(ttm);
335 if (unlikely(ret != 0)) {
336 ttm_tt_unpopulate(bdev, ttm);
337 return ret;
338 }
339 }
340
341 return 0;
342
343error:
344 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
345 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
346 if (bdev->pool.use_dma32)
347 atomic_long_sub(ttm->num_pages,
348 &ttm_dma32_pages_allocated);
349 }
350 return ret;
351}
352EXPORT_SYMBOL(ttm_tt_populate);
353
354void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
355{
356 if (!ttm_tt_is_populated(ttm))
357 return;
358
359 if (bdev->funcs->ttm_tt_unpopulate)
360 bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
361 else
362 ttm_pool_free(&bdev->pool, ttm);
363
364 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
365 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
366 if (bdev->pool.use_dma32)
367 atomic_long_sub(ttm->num_pages,
368 &ttm_dma32_pages_allocated);
369 }
370
371 ttm->page_flags &= ~TTM_TT_FLAG_PRIV_POPULATED;
372}
373
374#ifdef CONFIG_DEBUG_FS
375
376/* Test the shrinker functions and dump the result */
377static int ttm_tt_debugfs_shrink_show(struct seq_file *m, void *data)
378{
379 struct ttm_operation_ctx ctx = { false, false };
380
381 seq_printf(m, "%d\n", ttm_global_swapout(&ctx, GFP_KERNEL));
382 return 0;
383}
384DEFINE_SHOW_ATTRIBUTE(ttm_tt_debugfs_shrink);
385
386#endif
387
388
389/*
390 * ttm_tt_mgr_init - register with the MM shrinker
391 *
392 * Register with the MM shrinker for swapping out BOs.
393 */
394void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages)
395{
396#ifdef CONFIG_DEBUG_FS
397 debugfs_create_file("tt_shrink", 0400, ttm_debugfs_root, NULL,
398 &ttm_tt_debugfs_shrink_fops);
399#endif
400
401 if (!ttm_pages_limit)
402 ttm_pages_limit = num_pages;
403
404 if (!ttm_dma32_pages_limit)
405 ttm_dma32_pages_limit = num_dma32_pages;
406}
407
408static void ttm_kmap_iter_tt_map_local(struct ttm_kmap_iter *iter,
409 struct iosys_map *dmap,
410 pgoff_t i)
411{
412 struct ttm_kmap_iter_tt *iter_tt =
413 container_of(iter, typeof(*iter_tt), base);
414
415 iosys_map_set_vaddr(dmap, kmap_local_page_prot(iter_tt->tt->pages[i],
416 iter_tt->prot));
417}
418
419static void ttm_kmap_iter_tt_unmap_local(struct ttm_kmap_iter *iter,
420 struct iosys_map *map)
421{
422 kunmap_local(map->vaddr);
423}
424
425static const struct ttm_kmap_iter_ops ttm_kmap_iter_tt_ops = {
426 .map_local = ttm_kmap_iter_tt_map_local,
427 .unmap_local = ttm_kmap_iter_tt_unmap_local,
428 .maps_tt = true,
429};
430
431/**
432 * ttm_kmap_iter_tt_init - Initialize a struct ttm_kmap_iter_tt
433 * @iter_tt: The struct ttm_kmap_iter_tt to initialize.
434 * @tt: Struct ttm_tt holding page pointers of the struct ttm_resource.
435 *
436 * Return: Pointer to the embedded struct ttm_kmap_iter.
437 */
438struct ttm_kmap_iter *
439ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
440 struct ttm_tt *tt)
441{
442 iter_tt->base.ops = &ttm_kmap_iter_tt_ops;
443 iter_tt->tt = tt;
444 if (tt)
445 iter_tt->prot = ttm_prot_from_caching(tt->caching, PAGE_KERNEL);
446 else
447 iter_tt->prot = PAGE_KERNEL;
448
449 return &iter_tt->base;
450}
451EXPORT_SYMBOL(ttm_kmap_iter_tt_init);
452
453unsigned long ttm_tt_pages_limit(void)
454{
455 return ttm_pages_limit;
456}
457EXPORT_SYMBOL(ttm_tt_pages_limit);