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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);
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#define pr_fmt(fmt) "[TTM] " fmt
32
33#include <linux/sched.h>
34#include <linux/pagemap.h>
35#include <linux/shmem_fs.h>
36#include <linux/file.h>
37#include <drm/drm_cache.h>
38#include <drm/ttm/ttm_bo_driver.h>
39#include <drm/ttm/ttm_page_alloc.h>
40#ifdef CONFIG_X86
41#include <asm/set_memory.h>
42#endif
43
44/**
45 * Allocates a ttm structure for the given BO.
46 */
47int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
48{
49 struct ttm_bo_device *bdev = bo->bdev;
50 uint32_t page_flags = 0;
51
52 reservation_object_assert_held(bo->resv);
53
54 if (bdev->need_dma32)
55 page_flags |= TTM_PAGE_FLAG_DMA32;
56
57 if (bdev->no_retry)
58 page_flags |= TTM_PAGE_FLAG_NO_RETRY;
59
60 switch (bo->type) {
61 case ttm_bo_type_device:
62 if (zero_alloc)
63 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
64 break;
65 case ttm_bo_type_kernel:
66 break;
67 case ttm_bo_type_sg:
68 page_flags |= TTM_PAGE_FLAG_SG;
69 break;
70 default:
71 bo->ttm = NULL;
72 pr_err("Illegal buffer object type\n");
73 return -EINVAL;
74 }
75
76 bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);
77 if (unlikely(bo->ttm == NULL))
78 return -ENOMEM;
79
80 return 0;
81}
82
83/**
84 * Allocates storage for pointers to the pages that back the ttm.
85 */
86static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
87{
88 ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
89 GFP_KERNEL | __GFP_ZERO);
90 if (!ttm->pages)
91 return -ENOMEM;
92 return 0;
93}
94
95static int ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
96{
97 ttm->ttm.pages = kvmalloc_array(ttm->ttm.num_pages,
98 sizeof(*ttm->ttm.pages) +
99 sizeof(*ttm->dma_address),
100 GFP_KERNEL | __GFP_ZERO);
101 if (!ttm->ttm.pages)
102 return -ENOMEM;
103 ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
104 return 0;
105}
106
107static int ttm_sg_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
108{
109 ttm->dma_address = kvmalloc_array(ttm->ttm.num_pages,
110 sizeof(*ttm->dma_address),
111 GFP_KERNEL | __GFP_ZERO);
112 if (!ttm->dma_address)
113 return -ENOMEM;
114 return 0;
115}
116
117#ifdef CONFIG_X86
118static inline int ttm_tt_set_page_caching(struct page *p,
119 enum ttm_caching_state c_old,
120 enum ttm_caching_state c_new)
121{
122 int ret = 0;
123
124 if (PageHighMem(p))
125 return 0;
126
127 if (c_old != tt_cached) {
128 /* p isn't in the default caching state, set it to
129 * writeback first to free its current memtype. */
130
131 ret = set_pages_wb(p, 1);
132 if (ret)
133 return ret;
134 }
135
136 if (c_new == tt_wc)
137 ret = set_memory_wc((unsigned long) page_address(p), 1);
138 else if (c_new == tt_uncached)
139 ret = set_pages_uc(p, 1);
140
141 return ret;
142}
143#else /* CONFIG_X86 */
144static inline int ttm_tt_set_page_caching(struct page *p,
145 enum ttm_caching_state c_old,
146 enum ttm_caching_state c_new)
147{
148 return 0;
149}
150#endif /* CONFIG_X86 */
151
152/*
153 * Change caching policy for the linear kernel map
154 * for range of pages in a ttm.
155 */
156
157static int ttm_tt_set_caching(struct ttm_tt *ttm,
158 enum ttm_caching_state c_state)
159{
160 int i, j;
161 struct page *cur_page;
162 int ret;
163
164 if (ttm->caching_state == c_state)
165 return 0;
166
167 if (ttm->state == tt_unpopulated) {
168 /* Change caching but don't populate */
169 ttm->caching_state = c_state;
170 return 0;
171 }
172
173 if (ttm->caching_state == tt_cached)
174 drm_clflush_pages(ttm->pages, ttm->num_pages);
175
176 for (i = 0; i < ttm->num_pages; ++i) {
177 cur_page = ttm->pages[i];
178 if (likely(cur_page != NULL)) {
179 ret = ttm_tt_set_page_caching(cur_page,
180 ttm->caching_state,
181 c_state);
182 if (unlikely(ret != 0))
183 goto out_err;
184 }
185 }
186
187 ttm->caching_state = c_state;
188
189 return 0;
190
191out_err:
192 for (j = 0; j < i; ++j) {
193 cur_page = ttm->pages[j];
194 if (likely(cur_page != NULL)) {
195 (void)ttm_tt_set_page_caching(cur_page, c_state,
196 ttm->caching_state);
197 }
198 }
199
200 return ret;
201}
202
203int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
204{
205 enum ttm_caching_state state;
206
207 if (placement & TTM_PL_FLAG_WC)
208 state = tt_wc;
209 else if (placement & TTM_PL_FLAG_UNCACHED)
210 state = tt_uncached;
211 else
212 state = tt_cached;
213
214 return ttm_tt_set_caching(ttm, state);
215}
216EXPORT_SYMBOL(ttm_tt_set_placement_caching);
217
218void ttm_tt_destroy(struct ttm_tt *ttm)
219{
220 if (ttm == NULL)
221 return;
222
223 ttm_tt_unbind(ttm);
224
225 if (ttm->state == tt_unbound)
226 ttm_tt_unpopulate(ttm);
227
228 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
229 ttm->swap_storage)
230 fput(ttm->swap_storage);
231
232 ttm->swap_storage = NULL;
233 ttm->func->destroy(ttm);
234}
235
236void ttm_tt_init_fields(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
237 uint32_t page_flags)
238{
239 ttm->bdev = bo->bdev;
240 ttm->num_pages = bo->num_pages;
241 ttm->caching_state = tt_cached;
242 ttm->page_flags = page_flags;
243 ttm->state = tt_unpopulated;
244 ttm->swap_storage = NULL;
245 ttm->sg = bo->sg;
246}
247
248int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
249 uint32_t page_flags)
250{
251 ttm_tt_init_fields(ttm, bo, page_flags);
252
253 if (ttm_tt_alloc_page_directory(ttm)) {
254 ttm_tt_destroy(ttm);
255 pr_err("Failed allocating page table\n");
256 return -ENOMEM;
257 }
258 return 0;
259}
260EXPORT_SYMBOL(ttm_tt_init);
261
262void ttm_tt_fini(struct ttm_tt *ttm)
263{
264 kvfree(ttm->pages);
265 ttm->pages = NULL;
266}
267EXPORT_SYMBOL(ttm_tt_fini);
268
269int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
270 uint32_t page_flags)
271{
272 struct ttm_tt *ttm = &ttm_dma->ttm;
273
274 ttm_tt_init_fields(ttm, bo, page_flags);
275
276 INIT_LIST_HEAD(&ttm_dma->pages_list);
277 if (ttm_dma_tt_alloc_page_directory(ttm_dma)) {
278 ttm_tt_destroy(ttm);
279 pr_err("Failed allocating page table\n");
280 return -ENOMEM;
281 }
282 return 0;
283}
284EXPORT_SYMBOL(ttm_dma_tt_init);
285
286int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
287 uint32_t page_flags)
288{
289 struct ttm_tt *ttm = &ttm_dma->ttm;
290 int ret;
291
292 ttm_tt_init_fields(ttm, bo, page_flags);
293
294 INIT_LIST_HEAD(&ttm_dma->pages_list);
295 if (page_flags & TTM_PAGE_FLAG_SG)
296 ret = ttm_sg_tt_alloc_page_directory(ttm_dma);
297 else
298 ret = ttm_dma_tt_alloc_page_directory(ttm_dma);
299 if (ret) {
300 ttm_tt_destroy(ttm);
301 pr_err("Failed allocating page table\n");
302 return -ENOMEM;
303 }
304 return 0;
305}
306EXPORT_SYMBOL(ttm_sg_tt_init);
307
308void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
309{
310 struct ttm_tt *ttm = &ttm_dma->ttm;
311
312 if (ttm->pages)
313 kvfree(ttm->pages);
314 else
315 kvfree(ttm_dma->dma_address);
316 ttm->pages = NULL;
317 ttm_dma->dma_address = NULL;
318}
319EXPORT_SYMBOL(ttm_dma_tt_fini);
320
321void ttm_tt_unbind(struct ttm_tt *ttm)
322{
323 int ret;
324
325 if (ttm->state == tt_bound) {
326 ret = ttm->func->unbind(ttm);
327 BUG_ON(ret);
328 ttm->state = tt_unbound;
329 }
330}
331
332int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem,
333 struct ttm_operation_ctx *ctx)
334{
335 int ret = 0;
336
337 if (!ttm)
338 return -EINVAL;
339
340 if (ttm->state == tt_bound)
341 return 0;
342
343 ret = ttm_tt_populate(ttm, ctx);
344 if (ret)
345 return ret;
346
347 ret = ttm->func->bind(ttm, bo_mem);
348 if (unlikely(ret != 0))
349 return ret;
350
351 ttm->state = tt_bound;
352
353 return 0;
354}
355EXPORT_SYMBOL(ttm_tt_bind);
356
357int ttm_tt_swapin(struct ttm_tt *ttm)
358{
359 struct address_space *swap_space;
360 struct file *swap_storage;
361 struct page *from_page;
362 struct page *to_page;
363 int i;
364 int ret = -ENOMEM;
365
366 swap_storage = ttm->swap_storage;
367 BUG_ON(swap_storage == NULL);
368
369 swap_space = swap_storage->f_mapping;
370
371 for (i = 0; i < ttm->num_pages; ++i) {
372 gfp_t gfp_mask = mapping_gfp_mask(swap_space);
373
374 gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
375 from_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
376
377 if (IS_ERR(from_page)) {
378 ret = PTR_ERR(from_page);
379 goto out_err;
380 }
381 to_page = ttm->pages[i];
382 if (unlikely(to_page == NULL))
383 goto out_err;
384
385 copy_highpage(to_page, from_page);
386 put_page(from_page);
387 }
388
389 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
390 fput(swap_storage);
391 ttm->swap_storage = NULL;
392 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
393
394 return 0;
395out_err:
396 return ret;
397}
398
399int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
400{
401 struct address_space *swap_space;
402 struct file *swap_storage;
403 struct page *from_page;
404 struct page *to_page;
405 int i;
406 int ret = -ENOMEM;
407
408 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
409 BUG_ON(ttm->caching_state != tt_cached);
410
411 if (!persistent_swap_storage) {
412 swap_storage = shmem_file_setup("ttm swap",
413 ttm->num_pages << PAGE_SHIFT,
414 0);
415 if (IS_ERR(swap_storage)) {
416 pr_err("Failed allocating swap storage\n");
417 return PTR_ERR(swap_storage);
418 }
419 } else {
420 swap_storage = persistent_swap_storage;
421 }
422
423 swap_space = swap_storage->f_mapping;
424
425 for (i = 0; i < ttm->num_pages; ++i) {
426 gfp_t gfp_mask = mapping_gfp_mask(swap_space);
427
428 gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
429
430 from_page = ttm->pages[i];
431 if (unlikely(from_page == NULL))
432 continue;
433
434 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
435 if (IS_ERR(to_page)) {
436 ret = PTR_ERR(to_page);
437 goto out_err;
438 }
439 copy_highpage(to_page, from_page);
440 set_page_dirty(to_page);
441 mark_page_accessed(to_page);
442 put_page(to_page);
443 }
444
445 ttm_tt_unpopulate(ttm);
446 ttm->swap_storage = swap_storage;
447 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
448 if (persistent_swap_storage)
449 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
450
451 return 0;
452out_err:
453 if (!persistent_swap_storage)
454 fput(swap_storage);
455
456 return ret;
457}
458
459static void ttm_tt_add_mapping(struct ttm_tt *ttm)
460{
461 pgoff_t i;
462
463 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
464 return;
465
466 for (i = 0; i < ttm->num_pages; ++i)
467 ttm->pages[i]->mapping = ttm->bdev->dev_mapping;
468}
469
470int ttm_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
471{
472 int ret;
473
474 if (ttm->state != tt_unpopulated)
475 return 0;
476
477 if (ttm->bdev->driver->ttm_tt_populate)
478 ret = ttm->bdev->driver->ttm_tt_populate(ttm, ctx);
479 else
480 ret = ttm_pool_populate(ttm, ctx);
481 if (!ret)
482 ttm_tt_add_mapping(ttm);
483 return ret;
484}
485
486static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
487{
488 pgoff_t i;
489 struct page **page = ttm->pages;
490
491 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
492 return;
493
494 for (i = 0; i < ttm->num_pages; ++i) {
495 (*page)->mapping = NULL;
496 (*page++)->index = 0;
497 }
498}
499
500void ttm_tt_unpopulate(struct ttm_tt *ttm)
501{
502 if (ttm->state == tt_unpopulated)
503 return;
504
505 ttm_tt_clear_mapping(ttm);
506 if (ttm->bdev->driver->ttm_tt_unpopulate)
507 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
508 else
509 ttm_pool_unpopulate(ttm);
510}