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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/**************************************************************************
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/highmem.h>
35#include <linux/pagemap.h>
36#include <linux/shmem_fs.h>
37#include <linux/file.h>
38#include <linux/swap.h>
39#include <linux/slab.h>
40#include <linux/export.h>
41#include "drm_cache.h"
42#include "drm_mem_util.h"
43#include "ttm/ttm_module.h"
44#include "ttm/ttm_bo_driver.h"
45#include "ttm/ttm_placement.h"
46#include "ttm/ttm_page_alloc.h"
47
48/**
49 * Allocates storage for pointers to the pages that back the ttm.
50 */
51static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
52{
53 ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*));
54}
55
56static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
57{
58 ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, sizeof(void*));
59 ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages,
60 sizeof(*ttm->dma_address));
61}
62
63#ifdef CONFIG_X86
64static inline int ttm_tt_set_page_caching(struct page *p,
65 enum ttm_caching_state c_old,
66 enum ttm_caching_state c_new)
67{
68 int ret = 0;
69
70 if (PageHighMem(p))
71 return 0;
72
73 if (c_old != tt_cached) {
74 /* p isn't in the default caching state, set it to
75 * writeback first to free its current memtype. */
76
77 ret = set_pages_wb(p, 1);
78 if (ret)
79 return ret;
80 }
81
82 if (c_new == tt_wc)
83 ret = set_memory_wc((unsigned long) page_address(p), 1);
84 else if (c_new == tt_uncached)
85 ret = set_pages_uc(p, 1);
86
87 return ret;
88}
89#else /* CONFIG_X86 */
90static inline int ttm_tt_set_page_caching(struct page *p,
91 enum ttm_caching_state c_old,
92 enum ttm_caching_state c_new)
93{
94 return 0;
95}
96#endif /* CONFIG_X86 */
97
98/*
99 * Change caching policy for the linear kernel map
100 * for range of pages in a ttm.
101 */
102
103static int ttm_tt_set_caching(struct ttm_tt *ttm,
104 enum ttm_caching_state c_state)
105{
106 int i, j;
107 struct page *cur_page;
108 int ret;
109
110 if (ttm->caching_state == c_state)
111 return 0;
112
113 if (ttm->state == tt_unpopulated) {
114 /* Change caching but don't populate */
115 ttm->caching_state = c_state;
116 return 0;
117 }
118
119 if (ttm->caching_state == tt_cached)
120 drm_clflush_pages(ttm->pages, ttm->num_pages);
121
122 for (i = 0; i < ttm->num_pages; ++i) {
123 cur_page = ttm->pages[i];
124 if (likely(cur_page != NULL)) {
125 ret = ttm_tt_set_page_caching(cur_page,
126 ttm->caching_state,
127 c_state);
128 if (unlikely(ret != 0))
129 goto out_err;
130 }
131 }
132
133 ttm->caching_state = c_state;
134
135 return 0;
136
137out_err:
138 for (j = 0; j < i; ++j) {
139 cur_page = ttm->pages[j];
140 if (likely(cur_page != NULL)) {
141 (void)ttm_tt_set_page_caching(cur_page, c_state,
142 ttm->caching_state);
143 }
144 }
145
146 return ret;
147}
148
149int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
150{
151 enum ttm_caching_state state;
152
153 if (placement & TTM_PL_FLAG_WC)
154 state = tt_wc;
155 else if (placement & TTM_PL_FLAG_UNCACHED)
156 state = tt_uncached;
157 else
158 state = tt_cached;
159
160 return ttm_tt_set_caching(ttm, state);
161}
162EXPORT_SYMBOL(ttm_tt_set_placement_caching);
163
164void ttm_tt_destroy(struct ttm_tt *ttm)
165{
166 if (unlikely(ttm == NULL))
167 return;
168
169 if (ttm->state == tt_bound) {
170 ttm_tt_unbind(ttm);
171 }
172
173 if (likely(ttm->pages != NULL)) {
174 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
175 }
176
177 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
178 ttm->swap_storage)
179 fput(ttm->swap_storage);
180
181 ttm->swap_storage = NULL;
182 ttm->func->destroy(ttm);
183}
184
185int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
186 unsigned long size, uint32_t page_flags,
187 struct page *dummy_read_page)
188{
189 ttm->bdev = bdev;
190 ttm->glob = bdev->glob;
191 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
192 ttm->caching_state = tt_cached;
193 ttm->page_flags = page_flags;
194 ttm->dummy_read_page = dummy_read_page;
195 ttm->state = tt_unpopulated;
196 ttm->swap_storage = NULL;
197
198 ttm_tt_alloc_page_directory(ttm);
199 if (!ttm->pages) {
200 ttm_tt_destroy(ttm);
201 pr_err("Failed allocating page table\n");
202 return -ENOMEM;
203 }
204 return 0;
205}
206EXPORT_SYMBOL(ttm_tt_init);
207
208void ttm_tt_fini(struct ttm_tt *ttm)
209{
210 drm_free_large(ttm->pages);
211 ttm->pages = NULL;
212}
213EXPORT_SYMBOL(ttm_tt_fini);
214
215int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
216 unsigned long size, uint32_t page_flags,
217 struct page *dummy_read_page)
218{
219 struct ttm_tt *ttm = &ttm_dma->ttm;
220
221 ttm->bdev = bdev;
222 ttm->glob = bdev->glob;
223 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
224 ttm->caching_state = tt_cached;
225 ttm->page_flags = page_flags;
226 ttm->dummy_read_page = dummy_read_page;
227 ttm->state = tt_unpopulated;
228 ttm->swap_storage = NULL;
229
230 INIT_LIST_HEAD(&ttm_dma->pages_list);
231 ttm_dma_tt_alloc_page_directory(ttm_dma);
232 if (!ttm->pages || !ttm_dma->dma_address) {
233 ttm_tt_destroy(ttm);
234 pr_err("Failed allocating page table\n");
235 return -ENOMEM;
236 }
237 return 0;
238}
239EXPORT_SYMBOL(ttm_dma_tt_init);
240
241void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
242{
243 struct ttm_tt *ttm = &ttm_dma->ttm;
244
245 drm_free_large(ttm->pages);
246 ttm->pages = NULL;
247 drm_free_large(ttm_dma->dma_address);
248 ttm_dma->dma_address = NULL;
249}
250EXPORT_SYMBOL(ttm_dma_tt_fini);
251
252void ttm_tt_unbind(struct ttm_tt *ttm)
253{
254 int ret;
255
256 if (ttm->state == tt_bound) {
257 ret = ttm->func->unbind(ttm);
258 BUG_ON(ret);
259 ttm->state = tt_unbound;
260 }
261}
262
263int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
264{
265 int ret = 0;
266
267 if (!ttm)
268 return -EINVAL;
269
270 if (ttm->state == tt_bound)
271 return 0;
272
273 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
274 if (ret)
275 return ret;
276
277 ret = ttm->func->bind(ttm, bo_mem);
278 if (unlikely(ret != 0))
279 return ret;
280
281 ttm->state = tt_bound;
282
283 return 0;
284}
285EXPORT_SYMBOL(ttm_tt_bind);
286
287int ttm_tt_swapin(struct ttm_tt *ttm)
288{
289 struct address_space *swap_space;
290 struct file *swap_storage;
291 struct page *from_page;
292 struct page *to_page;
293 void *from_virtual;
294 void *to_virtual;
295 int i;
296 int ret = -ENOMEM;
297
298 swap_storage = ttm->swap_storage;
299 BUG_ON(swap_storage == NULL);
300
301 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
302
303 for (i = 0; i < ttm->num_pages; ++i) {
304 from_page = shmem_read_mapping_page(swap_space, i);
305 if (IS_ERR(from_page)) {
306 ret = PTR_ERR(from_page);
307 goto out_err;
308 }
309 to_page = ttm->pages[i];
310 if (unlikely(to_page == NULL))
311 goto out_err;
312
313 preempt_disable();
314 from_virtual = kmap_atomic(from_page);
315 to_virtual = kmap_atomic(to_page);
316 memcpy(to_virtual, from_virtual, PAGE_SIZE);
317 kunmap_atomic(to_virtual);
318 kunmap_atomic(from_virtual);
319 preempt_enable();
320 page_cache_release(from_page);
321 }
322
323 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
324 fput(swap_storage);
325 ttm->swap_storage = NULL;
326 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
327
328 return 0;
329out_err:
330 return ret;
331}
332
333int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
334{
335 struct address_space *swap_space;
336 struct file *swap_storage;
337 struct page *from_page;
338 struct page *to_page;
339 void *from_virtual;
340 void *to_virtual;
341 int i;
342 int ret = -ENOMEM;
343
344 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
345 BUG_ON(ttm->caching_state != tt_cached);
346
347 if (!persistent_swap_storage) {
348 swap_storage = shmem_file_setup("ttm swap",
349 ttm->num_pages << PAGE_SHIFT,
350 0);
351 if (unlikely(IS_ERR(swap_storage))) {
352 pr_err("Failed allocating swap storage\n");
353 return PTR_ERR(swap_storage);
354 }
355 } else
356 swap_storage = persistent_swap_storage;
357
358 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
359
360 for (i = 0; i < ttm->num_pages; ++i) {
361 from_page = ttm->pages[i];
362 if (unlikely(from_page == NULL))
363 continue;
364 to_page = shmem_read_mapping_page(swap_space, i);
365 if (unlikely(IS_ERR(to_page))) {
366 ret = PTR_ERR(to_page);
367 goto out_err;
368 }
369 preempt_disable();
370 from_virtual = kmap_atomic(from_page);
371 to_virtual = kmap_atomic(to_page);
372 memcpy(to_virtual, from_virtual, PAGE_SIZE);
373 kunmap_atomic(to_virtual);
374 kunmap_atomic(from_virtual);
375 preempt_enable();
376 set_page_dirty(to_page);
377 mark_page_accessed(to_page);
378 page_cache_release(to_page);
379 }
380
381 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
382 ttm->swap_storage = swap_storage;
383 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
384 if (persistent_swap_storage)
385 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
386
387 return 0;
388out_err:
389 if (!persistent_swap_storage)
390 fput(swap_storage);
391
392 return ret;
393}