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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/cc_platform.h>
35#include <linux/debugfs.h>
36#include <linux/file.h>
37#include <linux/module.h>
38#include <linux/sched.h>
39#include <linux/shmem_fs.h>
40#include <drm/drm_cache.h>
41#include <drm/drm_device.h>
42#include <drm/drm_util.h>
43#include <drm/ttm/ttm_bo.h>
44#include <drm/ttm/ttm_tt.h>
45
46#include "ttm_module.h"
47
48static unsigned long ttm_pages_limit;
49
50MODULE_PARM_DESC(pages_limit, "Limit for the allocated pages");
51module_param_named(pages_limit, ttm_pages_limit, ulong, 0644);
52
53static unsigned long ttm_dma32_pages_limit;
54
55MODULE_PARM_DESC(dma32_pages_limit, "Limit for the allocated DMA32 pages");
56module_param_named(dma32_pages_limit, ttm_dma32_pages_limit, ulong, 0644);
57
58static atomic_long_t ttm_pages_allocated;
59static atomic_long_t ttm_dma32_pages_allocated;
60
61/*
62 * Allocates a ttm structure for the given BO.
63 */
64int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
65{
66 struct ttm_device *bdev = bo->bdev;
67 struct drm_device *ddev = bo->base.dev;
68 uint32_t page_flags = 0;
69
70 dma_resv_assert_held(bo->base.resv);
71
72 if (bo->ttm)
73 return 0;
74
75 switch (bo->type) {
76 case ttm_bo_type_device:
77 if (zero_alloc)
78 page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
79 break;
80 case ttm_bo_type_kernel:
81 break;
82 case ttm_bo_type_sg:
83 page_flags |= TTM_TT_FLAG_EXTERNAL;
84 break;
85 default:
86 pr_err("Illegal buffer object type\n");
87 return -EINVAL;
88 }
89 /*
90 * When using dma_alloc_coherent with memory encryption the
91 * mapped TT pages need to be decrypted or otherwise the drivers
92 * will end up sending encrypted mem to the gpu.
93 */
94 if (bdev->pool.use_dma_alloc && cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
95 page_flags |= TTM_TT_FLAG_DECRYPTED;
96 drm_info_once(ddev, "TT memory decryption enabled.");
97 }
98
99 bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
100 if (unlikely(bo->ttm == NULL))
101 return -ENOMEM;
102
103 WARN_ON(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL_MAPPABLE &&
104 !(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL));
105
106 return 0;
107}
108EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_create);
109
110/*
111 * Allocates storage for pointers to the pages that back the ttm.
112 */
113static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
114{
115 ttm->pages = kvcalloc(ttm->num_pages, sizeof(void*), GFP_KERNEL);
116 if (!ttm->pages)
117 return -ENOMEM;
118
119 return 0;
120}
121
122static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
123{
124 ttm->pages = kvcalloc(ttm->num_pages, sizeof(*ttm->pages) +
125 sizeof(*ttm->dma_address), GFP_KERNEL);
126 if (!ttm->pages)
127 return -ENOMEM;
128
129 ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
130 return 0;
131}
132
133static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
134{
135 ttm->dma_address = kvcalloc(ttm->num_pages, sizeof(*ttm->dma_address),
136 GFP_KERNEL);
137 if (!ttm->dma_address)
138 return -ENOMEM;
139
140 return 0;
141}
142
143void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
144{
145 bdev->funcs->ttm_tt_destroy(bdev, ttm);
146}
147EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_destroy);
148
149static void ttm_tt_init_fields(struct ttm_tt *ttm,
150 struct ttm_buffer_object *bo,
151 uint32_t page_flags,
152 enum ttm_caching caching,
153 unsigned long extra_pages)
154{
155 ttm->num_pages = (PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT) + extra_pages;
156 ttm->page_flags = page_flags;
157 ttm->dma_address = NULL;
158 ttm->swap_storage = NULL;
159 ttm->sg = bo->sg;
160 ttm->caching = caching;
161}
162
163int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
164 uint32_t page_flags, enum ttm_caching caching,
165 unsigned long extra_pages)
166{
167 ttm_tt_init_fields(ttm, bo, page_flags, caching, extra_pages);
168
169 if (ttm_tt_alloc_page_directory(ttm)) {
170 pr_err("Failed allocating page table\n");
171 return -ENOMEM;
172 }
173 return 0;
174}
175EXPORT_SYMBOL(ttm_tt_init);
176
177void ttm_tt_fini(struct ttm_tt *ttm)
178{
179 WARN_ON(ttm->page_flags & TTM_TT_FLAG_PRIV_POPULATED);
180
181 if (ttm->swap_storage)
182 fput(ttm->swap_storage);
183 ttm->swap_storage = NULL;
184
185 if (ttm->pages)
186 kvfree(ttm->pages);
187 else
188 kvfree(ttm->dma_address);
189 ttm->pages = NULL;
190 ttm->dma_address = NULL;
191}
192EXPORT_SYMBOL(ttm_tt_fini);
193
194int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
195 uint32_t page_flags, enum ttm_caching caching)
196{
197 int ret;
198
199 ttm_tt_init_fields(ttm, bo, page_flags, caching, 0);
200
201 if (page_flags & TTM_TT_FLAG_EXTERNAL)
202 ret = ttm_sg_tt_alloc_page_directory(ttm);
203 else
204 ret = ttm_dma_tt_alloc_page_directory(ttm);
205 if (ret) {
206 pr_err("Failed allocating page table\n");
207 return -ENOMEM;
208 }
209 return 0;
210}
211EXPORT_SYMBOL(ttm_sg_tt_init);
212
213int ttm_tt_swapin(struct ttm_tt *ttm)
214{
215 struct address_space *swap_space;
216 struct file *swap_storage;
217 struct page *from_page;
218 struct page *to_page;
219 gfp_t gfp_mask;
220 int i, ret;
221
222 swap_storage = ttm->swap_storage;
223 BUG_ON(swap_storage == NULL);
224
225 swap_space = swap_storage->f_mapping;
226 gfp_mask = mapping_gfp_mask(swap_space);
227
228 for (i = 0; i < ttm->num_pages; ++i) {
229 from_page = shmem_read_mapping_page_gfp(swap_space, i,
230 gfp_mask);
231 if (IS_ERR(from_page)) {
232 ret = PTR_ERR(from_page);
233 goto out_err;
234 }
235 to_page = ttm->pages[i];
236 if (unlikely(to_page == NULL)) {
237 ret = -ENOMEM;
238 goto out_err;
239 }
240
241 copy_highpage(to_page, from_page);
242 put_page(from_page);
243 }
244
245 fput(swap_storage);
246 ttm->swap_storage = NULL;
247 ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
248
249 return 0;
250
251out_err:
252 return ret;
253}
254EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_swapin);
255
256/**
257 * ttm_tt_swapout - swap out tt object
258 *
259 * @bdev: TTM device structure.
260 * @ttm: The struct ttm_tt.
261 * @gfp_flags: Flags to use for memory allocation.
262 *
263 * Swapout a TT object to a shmem_file, return number of pages swapped out or
264 * negative error code.
265 */
266int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
267 gfp_t gfp_flags)
268{
269 loff_t size = (loff_t)ttm->num_pages << PAGE_SHIFT;
270 struct address_space *swap_space;
271 struct file *swap_storage;
272 struct page *from_page;
273 struct page *to_page;
274 int i, ret;
275
276 swap_storage = shmem_file_setup("ttm swap", size, 0);
277 if (IS_ERR(swap_storage)) {
278 pr_err("Failed allocating swap storage\n");
279 return PTR_ERR(swap_storage);
280 }
281
282 swap_space = swap_storage->f_mapping;
283 gfp_flags &= mapping_gfp_mask(swap_space);
284
285 for (i = 0; i < ttm->num_pages; ++i) {
286 from_page = ttm->pages[i];
287 if (unlikely(from_page == NULL))
288 continue;
289
290 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_flags);
291 if (IS_ERR(to_page)) {
292 ret = PTR_ERR(to_page);
293 goto out_err;
294 }
295 copy_highpage(to_page, from_page);
296 set_page_dirty(to_page);
297 mark_page_accessed(to_page);
298 put_page(to_page);
299 }
300
301 ttm_tt_unpopulate(bdev, ttm);
302 ttm->swap_storage = swap_storage;
303 ttm->page_flags |= TTM_TT_FLAG_SWAPPED;
304
305 return ttm->num_pages;
306
307out_err:
308 fput(swap_storage);
309
310 return ret;
311}
312EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_swapout);
313
314int ttm_tt_populate(struct ttm_device *bdev,
315 struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
316{
317 int ret;
318
319 if (!ttm)
320 return -EINVAL;
321
322 if (ttm_tt_is_populated(ttm))
323 return 0;
324
325 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
326 atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
327 if (bdev->pool.use_dma32)
328 atomic_long_add(ttm->num_pages,
329 &ttm_dma32_pages_allocated);
330 }
331
332 while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
333 atomic_long_read(&ttm_dma32_pages_allocated) >
334 ttm_dma32_pages_limit) {
335
336 ret = ttm_global_swapout(ctx, GFP_KERNEL);
337 if (ret == 0)
338 break;
339 if (ret < 0)
340 goto error;
341 }
342
343 if (bdev->funcs->ttm_tt_populate)
344 ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
345 else
346 ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
347 if (ret)
348 goto error;
349
350 ttm->page_flags |= TTM_TT_FLAG_PRIV_POPULATED;
351 if (unlikely(ttm->page_flags & TTM_TT_FLAG_SWAPPED)) {
352 ret = ttm_tt_swapin(ttm);
353 if (unlikely(ret != 0)) {
354 ttm_tt_unpopulate(bdev, ttm);
355 return ret;
356 }
357 }
358
359 return 0;
360
361error:
362 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
363 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
364 if (bdev->pool.use_dma32)
365 atomic_long_sub(ttm->num_pages,
366 &ttm_dma32_pages_allocated);
367 }
368 return ret;
369}
370
371#if IS_ENABLED(CONFIG_DRM_TTM_KUNIT_TEST)
372EXPORT_SYMBOL(ttm_tt_populate);
373#endif
374
375void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
376{
377 if (!ttm_tt_is_populated(ttm))
378 return;
379
380 if (bdev->funcs->ttm_tt_unpopulate)
381 bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
382 else
383 ttm_pool_free(&bdev->pool, ttm);
384
385 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
386 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
387 if (bdev->pool.use_dma32)
388 atomic_long_sub(ttm->num_pages,
389 &ttm_dma32_pages_allocated);
390 }
391
392 ttm->page_flags &= ~TTM_TT_FLAG_PRIV_POPULATED;
393}
394EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_unpopulate);
395
396#ifdef CONFIG_DEBUG_FS
397
398/* Test the shrinker functions and dump the result */
399static int ttm_tt_debugfs_shrink_show(struct seq_file *m, void *data)
400{
401 struct ttm_operation_ctx ctx = { false, false };
402
403 seq_printf(m, "%d\n", ttm_global_swapout(&ctx, GFP_KERNEL));
404 return 0;
405}
406DEFINE_SHOW_ATTRIBUTE(ttm_tt_debugfs_shrink);
407
408#endif
409
410
411/*
412 * ttm_tt_mgr_init - register with the MM shrinker
413 *
414 * Register with the MM shrinker for swapping out BOs.
415 */
416void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages)
417{
418#ifdef CONFIG_DEBUG_FS
419 debugfs_create_file("tt_shrink", 0400, ttm_debugfs_root, NULL,
420 &ttm_tt_debugfs_shrink_fops);
421#endif
422
423 if (!ttm_pages_limit)
424 ttm_pages_limit = num_pages;
425
426 if (!ttm_dma32_pages_limit)
427 ttm_dma32_pages_limit = num_dma32_pages;
428}
429
430static void ttm_kmap_iter_tt_map_local(struct ttm_kmap_iter *iter,
431 struct iosys_map *dmap,
432 pgoff_t i)
433{
434 struct ttm_kmap_iter_tt *iter_tt =
435 container_of(iter, typeof(*iter_tt), base);
436
437 iosys_map_set_vaddr(dmap, kmap_local_page_prot(iter_tt->tt->pages[i],
438 iter_tt->prot));
439}
440
441static void ttm_kmap_iter_tt_unmap_local(struct ttm_kmap_iter *iter,
442 struct iosys_map *map)
443{
444 kunmap_local(map->vaddr);
445}
446
447static const struct ttm_kmap_iter_ops ttm_kmap_iter_tt_ops = {
448 .map_local = ttm_kmap_iter_tt_map_local,
449 .unmap_local = ttm_kmap_iter_tt_unmap_local,
450 .maps_tt = true,
451};
452
453/**
454 * ttm_kmap_iter_tt_init - Initialize a struct ttm_kmap_iter_tt
455 * @iter_tt: The struct ttm_kmap_iter_tt to initialize.
456 * @tt: Struct ttm_tt holding page pointers of the struct ttm_resource.
457 *
458 * Return: Pointer to the embedded struct ttm_kmap_iter.
459 */
460struct ttm_kmap_iter *
461ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
462 struct ttm_tt *tt)
463{
464 iter_tt->base.ops = &ttm_kmap_iter_tt_ops;
465 iter_tt->tt = tt;
466 if (tt)
467 iter_tt->prot = ttm_prot_from_caching(tt->caching, PAGE_KERNEL);
468 else
469 iter_tt->prot = PAGE_KERNEL;
470
471 return &iter_tt->base;
472}
473EXPORT_SYMBOL(ttm_kmap_iter_tt_init);
474
475unsigned long ttm_tt_pages_limit(void)
476{
477 return ttm_pages_limit;
478}
479EXPORT_SYMBOL(ttm_tt_pages_limit);
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/pagemap.h>
36#include <linux/shmem_fs.h>
37#include <linux/file.h>
38#include <drm/drm_cache.h>
39#include <drm/ttm/ttm_bo_driver.h>
40#include <drm/ttm/ttm_page_alloc.h>
41#include <drm/ttm/ttm_set_memory.h>
42
43/**
44 * Allocates a ttm structure for the given BO.
45 */
46int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
47{
48 struct ttm_bo_device *bdev = bo->bdev;
49 uint32_t page_flags = 0;
50
51 dma_resv_assert_held(bo->base.resv);
52
53 if (bdev->need_dma32)
54 page_flags |= TTM_PAGE_FLAG_DMA32;
55
56 if (bdev->no_retry)
57 page_flags |= TTM_PAGE_FLAG_NO_RETRY;
58
59 switch (bo->type) {
60 case ttm_bo_type_device:
61 if (zero_alloc)
62 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
63 break;
64 case ttm_bo_type_kernel:
65 break;
66 case ttm_bo_type_sg:
67 page_flags |= TTM_PAGE_FLAG_SG;
68 break;
69 default:
70 bo->ttm = NULL;
71 pr_err("Illegal buffer object type\n");
72 return -EINVAL;
73 }
74
75 bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);
76 if (unlikely(bo->ttm == NULL))
77 return -ENOMEM;
78
79 return 0;
80}
81
82/**
83 * Allocates storage for pointers to the pages that back the ttm.
84 */
85static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
86{
87 ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
88 GFP_KERNEL | __GFP_ZERO);
89 if (!ttm->pages)
90 return -ENOMEM;
91 return 0;
92}
93
94static int ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
95{
96 ttm->ttm.pages = kvmalloc_array(ttm->ttm.num_pages,
97 sizeof(*ttm->ttm.pages) +
98 sizeof(*ttm->dma_address),
99 GFP_KERNEL | __GFP_ZERO);
100 if (!ttm->ttm.pages)
101 return -ENOMEM;
102 ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
103 return 0;
104}
105
106static int ttm_sg_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
107{
108 ttm->dma_address = kvmalloc_array(ttm->ttm.num_pages,
109 sizeof(*ttm->dma_address),
110 GFP_KERNEL | __GFP_ZERO);
111 if (!ttm->dma_address)
112 return -ENOMEM;
113 return 0;
114}
115
116static int ttm_tt_set_page_caching(struct page *p,
117 enum ttm_caching_state c_old,
118 enum ttm_caching_state c_new)
119{
120 int ret = 0;
121
122 if (PageHighMem(p))
123 return 0;
124
125 if (c_old != tt_cached) {
126 /* p isn't in the default caching state, set it to
127 * writeback first to free its current memtype. */
128
129 ret = ttm_set_pages_wb(p, 1);
130 if (ret)
131 return ret;
132 }
133
134 if (c_new == tt_wc)
135 ret = ttm_set_pages_wc(p, 1);
136 else if (c_new == tt_uncached)
137 ret = ttm_set_pages_uc(p, 1);
138
139 return ret;
140}
141
142/*
143 * Change caching policy for the linear kernel map
144 * for range of pages in a ttm.
145 */
146
147static int ttm_tt_set_caching(struct ttm_tt *ttm,
148 enum ttm_caching_state c_state)
149{
150 int i, j;
151 struct page *cur_page;
152 int ret;
153
154 if (ttm->caching_state == c_state)
155 return 0;
156
157 if (ttm->state == tt_unpopulated) {
158 /* Change caching but don't populate */
159 ttm->caching_state = c_state;
160 return 0;
161 }
162
163 if (ttm->caching_state == tt_cached)
164 drm_clflush_pages(ttm->pages, ttm->num_pages);
165
166 for (i = 0; i < ttm->num_pages; ++i) {
167 cur_page = ttm->pages[i];
168 if (likely(cur_page != NULL)) {
169 ret = ttm_tt_set_page_caching(cur_page,
170 ttm->caching_state,
171 c_state);
172 if (unlikely(ret != 0))
173 goto out_err;
174 }
175 }
176
177 ttm->caching_state = c_state;
178
179 return 0;
180
181out_err:
182 for (j = 0; j < i; ++j) {
183 cur_page = ttm->pages[j];
184 if (likely(cur_page != NULL)) {
185 (void)ttm_tt_set_page_caching(cur_page, c_state,
186 ttm->caching_state);
187 }
188 }
189
190 return ret;
191}
192
193int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
194{
195 enum ttm_caching_state state;
196
197 if (placement & TTM_PL_FLAG_WC)
198 state = tt_wc;
199 else if (placement & TTM_PL_FLAG_UNCACHED)
200 state = tt_uncached;
201 else
202 state = tt_cached;
203
204 return ttm_tt_set_caching(ttm, state);
205}
206EXPORT_SYMBOL(ttm_tt_set_placement_caching);
207
208void ttm_tt_destroy(struct ttm_tt *ttm)
209{
210 if (ttm == NULL)
211 return;
212
213 ttm_tt_unbind(ttm);
214
215 if (ttm->state == tt_unbound)
216 ttm_tt_unpopulate(ttm);
217
218 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
219 ttm->swap_storage)
220 fput(ttm->swap_storage);
221
222 ttm->swap_storage = NULL;
223 ttm->func->destroy(ttm);
224}
225
226void ttm_tt_init_fields(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
227 uint32_t page_flags)
228{
229 ttm->bdev = bo->bdev;
230 ttm->num_pages = bo->num_pages;
231 ttm->caching_state = tt_cached;
232 ttm->page_flags = page_flags;
233 ttm->state = tt_unpopulated;
234 ttm->swap_storage = NULL;
235 ttm->sg = bo->sg;
236}
237
238int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
239 uint32_t page_flags)
240{
241 ttm_tt_init_fields(ttm, bo, page_flags);
242
243 if (ttm_tt_alloc_page_directory(ttm)) {
244 ttm_tt_destroy(ttm);
245 pr_err("Failed allocating page table\n");
246 return -ENOMEM;
247 }
248 return 0;
249}
250EXPORT_SYMBOL(ttm_tt_init);
251
252void ttm_tt_fini(struct ttm_tt *ttm)
253{
254 kvfree(ttm->pages);
255 ttm->pages = NULL;
256}
257EXPORT_SYMBOL(ttm_tt_fini);
258
259int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
260 uint32_t page_flags)
261{
262 struct ttm_tt *ttm = &ttm_dma->ttm;
263
264 ttm_tt_init_fields(ttm, bo, page_flags);
265
266 INIT_LIST_HEAD(&ttm_dma->pages_list);
267 if (ttm_dma_tt_alloc_page_directory(ttm_dma)) {
268 ttm_tt_destroy(ttm);
269 pr_err("Failed allocating page table\n");
270 return -ENOMEM;
271 }
272 return 0;
273}
274EXPORT_SYMBOL(ttm_dma_tt_init);
275
276int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
277 uint32_t page_flags)
278{
279 struct ttm_tt *ttm = &ttm_dma->ttm;
280 int ret;
281
282 ttm_tt_init_fields(ttm, bo, page_flags);
283
284 INIT_LIST_HEAD(&ttm_dma->pages_list);
285 if (page_flags & TTM_PAGE_FLAG_SG)
286 ret = ttm_sg_tt_alloc_page_directory(ttm_dma);
287 else
288 ret = ttm_dma_tt_alloc_page_directory(ttm_dma);
289 if (ret) {
290 ttm_tt_destroy(ttm);
291 pr_err("Failed allocating page table\n");
292 return -ENOMEM;
293 }
294 return 0;
295}
296EXPORT_SYMBOL(ttm_sg_tt_init);
297
298void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
299{
300 struct ttm_tt *ttm = &ttm_dma->ttm;
301
302 if (ttm->pages)
303 kvfree(ttm->pages);
304 else
305 kvfree(ttm_dma->dma_address);
306 ttm->pages = NULL;
307 ttm_dma->dma_address = NULL;
308}
309EXPORT_SYMBOL(ttm_dma_tt_fini);
310
311void ttm_tt_unbind(struct ttm_tt *ttm)
312{
313 int ret;
314
315 if (ttm->state == tt_bound) {
316 ret = ttm->func->unbind(ttm);
317 BUG_ON(ret);
318 ttm->state = tt_unbound;
319 }
320}
321
322int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem,
323 struct ttm_operation_ctx *ctx)
324{
325 int ret = 0;
326
327 if (!ttm)
328 return -EINVAL;
329
330 if (ttm->state == tt_bound)
331 return 0;
332
333 ret = ttm_tt_populate(ttm, ctx);
334 if (ret)
335 return ret;
336
337 ret = ttm->func->bind(ttm, bo_mem);
338 if (unlikely(ret != 0))
339 return ret;
340
341 ttm->state = tt_bound;
342
343 return 0;
344}
345EXPORT_SYMBOL(ttm_tt_bind);
346
347int ttm_tt_swapin(struct ttm_tt *ttm)
348{
349 struct address_space *swap_space;
350 struct file *swap_storage;
351 struct page *from_page;
352 struct page *to_page;
353 int i;
354 int ret = -ENOMEM;
355
356 swap_storage = ttm->swap_storage;
357 BUG_ON(swap_storage == NULL);
358
359 swap_space = swap_storage->f_mapping;
360
361 for (i = 0; i < ttm->num_pages; ++i) {
362 gfp_t gfp_mask = mapping_gfp_mask(swap_space);
363
364 gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
365 from_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
366
367 if (IS_ERR(from_page)) {
368 ret = PTR_ERR(from_page);
369 goto out_err;
370 }
371 to_page = ttm->pages[i];
372 if (unlikely(to_page == NULL))
373 goto out_err;
374
375 copy_highpage(to_page, from_page);
376 put_page(from_page);
377 }
378
379 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
380 fput(swap_storage);
381 ttm->swap_storage = NULL;
382 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
383
384 return 0;
385out_err:
386 return ret;
387}
388
389int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
390{
391 struct address_space *swap_space;
392 struct file *swap_storage;
393 struct page *from_page;
394 struct page *to_page;
395 int i;
396 int ret = -ENOMEM;
397
398 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
399 BUG_ON(ttm->caching_state != tt_cached);
400
401 if (!persistent_swap_storage) {
402 swap_storage = shmem_file_setup("ttm swap",
403 ttm->num_pages << PAGE_SHIFT,
404 0);
405 if (IS_ERR(swap_storage)) {
406 pr_err("Failed allocating swap storage\n");
407 return PTR_ERR(swap_storage);
408 }
409 } else {
410 swap_storage = persistent_swap_storage;
411 }
412
413 swap_space = swap_storage->f_mapping;
414
415 for (i = 0; i < ttm->num_pages; ++i) {
416 gfp_t gfp_mask = mapping_gfp_mask(swap_space);
417
418 gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
419
420 from_page = ttm->pages[i];
421 if (unlikely(from_page == NULL))
422 continue;
423
424 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
425 if (IS_ERR(to_page)) {
426 ret = PTR_ERR(to_page);
427 goto out_err;
428 }
429 copy_highpage(to_page, from_page);
430 set_page_dirty(to_page);
431 mark_page_accessed(to_page);
432 put_page(to_page);
433 }
434
435 ttm_tt_unpopulate(ttm);
436 ttm->swap_storage = swap_storage;
437 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
438 if (persistent_swap_storage)
439 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
440
441 return 0;
442out_err:
443 if (!persistent_swap_storage)
444 fput(swap_storage);
445
446 return ret;
447}
448
449static void ttm_tt_add_mapping(struct ttm_tt *ttm)
450{
451 pgoff_t i;
452
453 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
454 return;
455
456 for (i = 0; i < ttm->num_pages; ++i)
457 ttm->pages[i]->mapping = ttm->bdev->dev_mapping;
458}
459
460int ttm_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
461{
462 int ret;
463
464 if (ttm->state != tt_unpopulated)
465 return 0;
466
467 if (ttm->bdev->driver->ttm_tt_populate)
468 ret = ttm->bdev->driver->ttm_tt_populate(ttm, ctx);
469 else
470 ret = ttm_pool_populate(ttm, ctx);
471 if (!ret)
472 ttm_tt_add_mapping(ttm);
473 return ret;
474}
475
476static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
477{
478 pgoff_t i;
479 struct page **page = ttm->pages;
480
481 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
482 return;
483
484 for (i = 0; i < ttm->num_pages; ++i) {
485 (*page)->mapping = NULL;
486 (*page++)->index = 0;
487 }
488}
489
490void ttm_tt_unpopulate(struct ttm_tt *ttm)
491{
492 if (ttm->state == tt_unpopulated)
493 return;
494
495 ttm_tt_clear_mapping(ttm);
496 if (ttm->bdev->driver->ttm_tt_unpopulate)
497 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
498 else
499 ttm_pool_unpopulate(ttm);
500}