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ba4e7d97 TH |
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 | ||
25d0479a JP |
31 | #define pr_fmt(fmt) "[TTM] " fmt |
32 | ||
ba4e7d97 TH |
33 | #include <linux/sched.h> |
34 | #include <linux/highmem.h> | |
35 | #include <linux/pagemap.h> | |
3142b651 | 36 | #include <linux/shmem_fs.h> |
ba4e7d97 TH |
37 | #include <linux/file.h> |
38 | #include <linux/swap.h> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
2d1a8a48 | 40 | #include <linux/export.h> |
760285e7 DH |
41 | #include <drm/drm_cache.h> |
42 | #include <drm/drm_mem_util.h> | |
43 | #include <drm/ttm/ttm_module.h> | |
44 | #include <drm/ttm/ttm_bo_driver.h> | |
45 | #include <drm/ttm/ttm_placement.h> | |
46 | #include <drm/ttm/ttm_page_alloc.h> | |
ba4e7d97 | 47 | |
ba4e7d97 TH |
48 | /** |
49 | * Allocates storage for pointers to the pages that back the ttm. | |
ba4e7d97 TH |
50 | */ |
51 | static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) | |
52 | { | |
8e7e7052 | 53 | ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*)); |
ba4e7d97 TH |
54 | } |
55 | ||
8e7e7052 | 56 | static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) |
ba4e7d97 | 57 | { |
3d50d4dc AC |
58 | ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, |
59 | sizeof(*ttm->ttm.pages) + | |
60 | sizeof(*ttm->dma_address) + | |
61 | sizeof(*ttm->cpu_address)); | |
62 | ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages); | |
63 | ttm->dma_address = (void *) (ttm->cpu_address + ttm->ttm.num_pages); | |
ba4e7d97 TH |
64 | } |
65 | ||
ba4e7d97 TH |
66 | #ifdef CONFIG_X86 |
67 | static inline int ttm_tt_set_page_caching(struct page *p, | |
f0e2f38b FJ |
68 | enum ttm_caching_state c_old, |
69 | enum ttm_caching_state c_new) | |
ba4e7d97 | 70 | { |
db78e27d FJ |
71 | int ret = 0; |
72 | ||
ba4e7d97 TH |
73 | if (PageHighMem(p)) |
74 | return 0; | |
75 | ||
f0e2f38b | 76 | if (c_old != tt_cached) { |
db78e27d FJ |
77 | /* p isn't in the default caching state, set it to |
78 | * writeback first to free its current memtype. */ | |
79 | ||
80 | ret = set_pages_wb(p, 1); | |
81 | if (ret) | |
82 | return ret; | |
ba4e7d97 | 83 | } |
db78e27d | 84 | |
f0e2f38b | 85 | if (c_new == tt_wc) |
db78e27d | 86 | ret = set_memory_wc((unsigned long) page_address(p), 1); |
f0e2f38b | 87 | else if (c_new == tt_uncached) |
db78e27d FJ |
88 | ret = set_pages_uc(p, 1); |
89 | ||
90 | return ret; | |
ba4e7d97 TH |
91 | } |
92 | #else /* CONFIG_X86 */ | |
93 | static inline int ttm_tt_set_page_caching(struct page *p, | |
f0e2f38b FJ |
94 | enum ttm_caching_state c_old, |
95 | enum ttm_caching_state c_new) | |
ba4e7d97 TH |
96 | { |
97 | return 0; | |
98 | } | |
99 | #endif /* CONFIG_X86 */ | |
100 | ||
101 | /* | |
102 | * Change caching policy for the linear kernel map | |
103 | * for range of pages in a ttm. | |
104 | */ | |
105 | ||
106 | static int ttm_tt_set_caching(struct ttm_tt *ttm, | |
107 | enum ttm_caching_state c_state) | |
108 | { | |
109 | int i, j; | |
110 | struct page *cur_page; | |
111 | int ret; | |
112 | ||
113 | if (ttm->caching_state == c_state) | |
114 | return 0; | |
115 | ||
1403b1a3 PN |
116 | if (ttm->state == tt_unpopulated) { |
117 | /* Change caching but don't populate */ | |
118 | ttm->caching_state = c_state; | |
119 | return 0; | |
ba4e7d97 TH |
120 | } |
121 | ||
122 | if (ttm->caching_state == tt_cached) | |
c9c97b8c | 123 | drm_clflush_pages(ttm->pages, ttm->num_pages); |
ba4e7d97 TH |
124 | |
125 | for (i = 0; i < ttm->num_pages; ++i) { | |
126 | cur_page = ttm->pages[i]; | |
127 | if (likely(cur_page != NULL)) { | |
f0e2f38b FJ |
128 | ret = ttm_tt_set_page_caching(cur_page, |
129 | ttm->caching_state, | |
130 | c_state); | |
ba4e7d97 TH |
131 | if (unlikely(ret != 0)) |
132 | goto out_err; | |
133 | } | |
134 | } | |
135 | ||
136 | ttm->caching_state = c_state; | |
137 | ||
138 | return 0; | |
139 | ||
140 | out_err: | |
141 | for (j = 0; j < i; ++j) { | |
142 | cur_page = ttm->pages[j]; | |
143 | if (likely(cur_page != NULL)) { | |
f0e2f38b | 144 | (void)ttm_tt_set_page_caching(cur_page, c_state, |
ba4e7d97 TH |
145 | ttm->caching_state); |
146 | } | |
147 | } | |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
152 | int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) | |
153 | { | |
154 | enum ttm_caching_state state; | |
155 | ||
156 | if (placement & TTM_PL_FLAG_WC) | |
157 | state = tt_wc; | |
158 | else if (placement & TTM_PL_FLAG_UNCACHED) | |
159 | state = tt_uncached; | |
160 | else | |
161 | state = tt_cached; | |
162 | ||
163 | return ttm_tt_set_caching(ttm, state); | |
164 | } | |
df67bed9 | 165 | EXPORT_SYMBOL(ttm_tt_set_placement_caching); |
ba4e7d97 | 166 | |
ba4e7d97 TH |
167 | void ttm_tt_destroy(struct ttm_tt *ttm) |
168 | { | |
ba4e7d97 TH |
169 | if (unlikely(ttm == NULL)) |
170 | return; | |
171 | ||
649bf3ca JG |
172 | if (ttm->state == tt_bound) { |
173 | ttm_tt_unbind(ttm); | |
ba4e7d97 TH |
174 | } |
175 | ||
58aa6622 TH |
176 | if (ttm->state == tt_unbound) |
177 | ttm_tt_unpopulate(ttm); | |
ba4e7d97 | 178 | |
5df23979 | 179 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && |
ba4e7d97 TH |
180 | ttm->swap_storage) |
181 | fput(ttm->swap_storage); | |
182 | ||
649bf3ca JG |
183 | ttm->swap_storage = NULL; |
184 | ttm->func->destroy(ttm); | |
ba4e7d97 TH |
185 | } |
186 | ||
649bf3ca JG |
187 | int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, |
188 | unsigned long size, uint32_t page_flags, | |
189 | struct page *dummy_read_page) | |
ba4e7d97 | 190 | { |
649bf3ca | 191 | ttm->bdev = bdev; |
a987fcaa | 192 | ttm->glob = bdev->glob; |
ba4e7d97 | 193 | ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
ba4e7d97 TH |
194 | ttm->caching_state = tt_cached; |
195 | ttm->page_flags = page_flags; | |
ba4e7d97 | 196 | ttm->dummy_read_page = dummy_read_page; |
649bf3ca | 197 | ttm->state = tt_unpopulated; |
dea7e0ac | 198 | ttm->swap_storage = NULL; |
ba4e7d97 TH |
199 | |
200 | ttm_tt_alloc_page_directory(ttm); | |
8e7e7052 | 201 | if (!ttm->pages) { |
ba4e7d97 | 202 | ttm_tt_destroy(ttm); |
25d0479a | 203 | pr_err("Failed allocating page table\n"); |
649bf3ca | 204 | return -ENOMEM; |
ba4e7d97 | 205 | } |
649bf3ca | 206 | return 0; |
ba4e7d97 | 207 | } |
649bf3ca | 208 | EXPORT_SYMBOL(ttm_tt_init); |
ba4e7d97 | 209 | |
8e7e7052 JG |
210 | void ttm_tt_fini(struct ttm_tt *ttm) |
211 | { | |
212 | drm_free_large(ttm->pages); | |
213 | ttm->pages = NULL; | |
214 | } | |
215 | EXPORT_SYMBOL(ttm_tt_fini); | |
216 | ||
217 | int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, | |
218 | unsigned long size, uint32_t page_flags, | |
219 | struct page *dummy_read_page) | |
220 | { | |
221 | struct ttm_tt *ttm = &ttm_dma->ttm; | |
222 | ||
223 | ttm->bdev = bdev; | |
224 | ttm->glob = bdev->glob; | |
225 | ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
226 | ttm->caching_state = tt_cached; | |
227 | ttm->page_flags = page_flags; | |
228 | ttm->dummy_read_page = dummy_read_page; | |
229 | ttm->state = tt_unpopulated; | |
dea7e0ac | 230 | ttm->swap_storage = NULL; |
8e7e7052 JG |
231 | |
232 | INIT_LIST_HEAD(&ttm_dma->pages_list); | |
233 | ttm_dma_tt_alloc_page_directory(ttm_dma); | |
3d50d4dc | 234 | if (!ttm->pages) { |
8e7e7052 | 235 | ttm_tt_destroy(ttm); |
25d0479a | 236 | pr_err("Failed allocating page table\n"); |
8e7e7052 JG |
237 | return -ENOMEM; |
238 | } | |
239 | return 0; | |
240 | } | |
241 | EXPORT_SYMBOL(ttm_dma_tt_init); | |
242 | ||
243 | void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) | |
244 | { | |
245 | struct ttm_tt *ttm = &ttm_dma->ttm; | |
246 | ||
247 | drm_free_large(ttm->pages); | |
248 | ttm->pages = NULL; | |
3d50d4dc | 249 | ttm_dma->cpu_address = NULL; |
8e7e7052 JG |
250 | ttm_dma->dma_address = NULL; |
251 | } | |
252 | EXPORT_SYMBOL(ttm_dma_tt_fini); | |
253 | ||
ba4e7d97 TH |
254 | void ttm_tt_unbind(struct ttm_tt *ttm) |
255 | { | |
256 | int ret; | |
ba4e7d97 TH |
257 | |
258 | if (ttm->state == tt_bound) { | |
649bf3ca | 259 | ret = ttm->func->unbind(ttm); |
ba4e7d97 TH |
260 | BUG_ON(ret); |
261 | ttm->state = tt_unbound; | |
262 | } | |
263 | } | |
264 | ||
265 | int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) | |
266 | { | |
267 | int ret = 0; | |
ba4e7d97 TH |
268 | |
269 | if (!ttm) | |
270 | return -EINVAL; | |
271 | ||
272 | if (ttm->state == tt_bound) | |
273 | return 0; | |
274 | ||
b1e5f172 | 275 | ret = ttm->bdev->driver->ttm_tt_populate(ttm); |
ba4e7d97 TH |
276 | if (ret) |
277 | return ret; | |
278 | ||
649bf3ca | 279 | ret = ttm->func->bind(ttm, bo_mem); |
7dcebb52 | 280 | if (unlikely(ret != 0)) |
ba4e7d97 | 281 | return ret; |
ba4e7d97 TH |
282 | |
283 | ttm->state = tt_bound; | |
284 | ||
ba4e7d97 TH |
285 | return 0; |
286 | } | |
287 | EXPORT_SYMBOL(ttm_tt_bind); | |
288 | ||
b1e5f172 | 289 | int ttm_tt_swapin(struct ttm_tt *ttm) |
ba4e7d97 TH |
290 | { |
291 | struct address_space *swap_space; | |
292 | struct file *swap_storage; | |
293 | struct page *from_page; | |
294 | struct page *to_page; | |
ba4e7d97 | 295 | int i; |
290e5505 | 296 | int ret = -ENOMEM; |
ba4e7d97 | 297 | |
ba4e7d97 TH |
298 | swap_storage = ttm->swap_storage; |
299 | BUG_ON(swap_storage == NULL); | |
300 | ||
496ad9aa | 301 | swap_space = file_inode(swap_storage)->i_mapping; |
ba4e7d97 TH |
302 | |
303 | for (i = 0; i < ttm->num_pages; ++i) { | |
3142b651 | 304 | from_page = shmem_read_mapping_page(swap_space, i); |
290e5505 MM |
305 | if (IS_ERR(from_page)) { |
306 | ret = PTR_ERR(from_page); | |
ba4e7d97 | 307 | goto out_err; |
290e5505 | 308 | } |
b1e5f172 | 309 | to_page = ttm->pages[i]; |
ba4e7d97 TH |
310 | if (unlikely(to_page == NULL)) |
311 | goto out_err; | |
312 | ||
259a290e | 313 | copy_highpage(to_page, from_page); |
ba4e7d97 TH |
314 | page_cache_release(from_page); |
315 | } | |
316 | ||
5df23979 | 317 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) |
ba4e7d97 TH |
318 | fput(swap_storage); |
319 | ttm->swap_storage = NULL; | |
320 | ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; | |
321 | ||
322 | return 0; | |
323 | out_err: | |
290e5505 | 324 | return ret; |
ba4e7d97 TH |
325 | } |
326 | ||
5df23979 | 327 | int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage) |
ba4e7d97 TH |
328 | { |
329 | struct address_space *swap_space; | |
330 | struct file *swap_storage; | |
331 | struct page *from_page; | |
332 | struct page *to_page; | |
ba4e7d97 | 333 | int i; |
290e5505 | 334 | int ret = -ENOMEM; |
ba4e7d97 TH |
335 | |
336 | BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); | |
337 | BUG_ON(ttm->caching_state != tt_cached); | |
338 | ||
5df23979 | 339 | if (!persistent_swap_storage) { |
ba4e7d97 TH |
340 | swap_storage = shmem_file_setup("ttm swap", |
341 | ttm->num_pages << PAGE_SHIFT, | |
342 | 0); | |
343 | if (unlikely(IS_ERR(swap_storage))) { | |
25d0479a | 344 | pr_err("Failed allocating swap storage\n"); |
290e5505 | 345 | return PTR_ERR(swap_storage); |
ba4e7d97 TH |
346 | } |
347 | } else | |
5df23979 | 348 | swap_storage = persistent_swap_storage; |
ba4e7d97 | 349 | |
496ad9aa | 350 | swap_space = file_inode(swap_storage)->i_mapping; |
ba4e7d97 TH |
351 | |
352 | for (i = 0; i < ttm->num_pages; ++i) { | |
353 | from_page = ttm->pages[i]; | |
354 | if (unlikely(from_page == NULL)) | |
355 | continue; | |
3142b651 | 356 | to_page = shmem_read_mapping_page(swap_space, i); |
290e5505 MM |
357 | if (unlikely(IS_ERR(to_page))) { |
358 | ret = PTR_ERR(to_page); | |
ba4e7d97 | 359 | goto out_err; |
290e5505 | 360 | } |
259a290e | 361 | copy_highpage(to_page, from_page); |
ba4e7d97 TH |
362 | set_page_dirty(to_page); |
363 | mark_page_accessed(to_page); | |
364 | page_cache_release(to_page); | |
365 | } | |
366 | ||
58aa6622 | 367 | ttm_tt_unpopulate(ttm); |
ba4e7d97 TH |
368 | ttm->swap_storage = swap_storage; |
369 | ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; | |
5df23979 JE |
370 | if (persistent_swap_storage) |
371 | ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP; | |
ba4e7d97 TH |
372 | |
373 | return 0; | |
374 | out_err: | |
5df23979 | 375 | if (!persistent_swap_storage) |
ba4e7d97 TH |
376 | fput(swap_storage); |
377 | ||
290e5505 | 378 | return ret; |
ba4e7d97 | 379 | } |
58aa6622 TH |
380 | |
381 | static void ttm_tt_clear_mapping(struct ttm_tt *ttm) | |
382 | { | |
383 | pgoff_t i; | |
384 | struct page **page = ttm->pages; | |
385 | ||
1b76af5c TH |
386 | if (ttm->page_flags & TTM_PAGE_FLAG_SG) |
387 | return; | |
388 | ||
58aa6622 TH |
389 | for (i = 0; i < ttm->num_pages; ++i) { |
390 | (*page)->mapping = NULL; | |
391 | (*page++)->index = 0; | |
392 | } | |
393 | } | |
394 | ||
395 | void ttm_tt_unpopulate(struct ttm_tt *ttm) | |
396 | { | |
397 | if (ttm->state == tt_unpopulated) | |
398 | return; | |
399 | ||
400 | ttm_tt_clear_mapping(ttm); | |
401 | ttm->bdev->driver->ttm_tt_unpopulate(ttm); | |
402 | } |