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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 | { |
8e7e7052 JG |
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)); | |
ba4e7d97 TH |
61 | } |
62 | ||
ba4e7d97 TH |
63 | #ifdef CONFIG_X86 |
64 | static inline int ttm_tt_set_page_caching(struct page *p, | |
f0e2f38b FJ |
65 | enum ttm_caching_state c_old, |
66 | enum ttm_caching_state c_new) | |
ba4e7d97 | 67 | { |
db78e27d FJ |
68 | int ret = 0; |
69 | ||
ba4e7d97 TH |
70 | if (PageHighMem(p)) |
71 | return 0; | |
72 | ||
f0e2f38b | 73 | if (c_old != tt_cached) { |
db78e27d FJ |
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; | |
ba4e7d97 | 80 | } |
db78e27d | 81 | |
f0e2f38b | 82 | if (c_new == tt_wc) |
db78e27d | 83 | ret = set_memory_wc((unsigned long) page_address(p), 1); |
f0e2f38b | 84 | else if (c_new == tt_uncached) |
db78e27d FJ |
85 | ret = set_pages_uc(p, 1); |
86 | ||
87 | return ret; | |
ba4e7d97 TH |
88 | } |
89 | #else /* CONFIG_X86 */ | |
90 | static inline int ttm_tt_set_page_caching(struct page *p, | |
f0e2f38b FJ |
91 | enum ttm_caching_state c_old, |
92 | enum ttm_caching_state c_new) | |
ba4e7d97 TH |
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 | ||
103 | static 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 | ||
1403b1a3 PN |
113 | if (ttm->state == tt_unpopulated) { |
114 | /* Change caching but don't populate */ | |
115 | ttm->caching_state = c_state; | |
116 | return 0; | |
ba4e7d97 TH |
117 | } |
118 | ||
119 | if (ttm->caching_state == tt_cached) | |
c9c97b8c | 120 | drm_clflush_pages(ttm->pages, ttm->num_pages); |
ba4e7d97 TH |
121 | |
122 | for (i = 0; i < ttm->num_pages; ++i) { | |
123 | cur_page = ttm->pages[i]; | |
124 | if (likely(cur_page != NULL)) { | |
f0e2f38b FJ |
125 | ret = ttm_tt_set_page_caching(cur_page, |
126 | ttm->caching_state, | |
127 | c_state); | |
ba4e7d97 TH |
128 | if (unlikely(ret != 0)) |
129 | goto out_err; | |
130 | } | |
131 | } | |
132 | ||
133 | ttm->caching_state = c_state; | |
134 | ||
135 | return 0; | |
136 | ||
137 | out_err: | |
138 | for (j = 0; j < i; ++j) { | |
139 | cur_page = ttm->pages[j]; | |
140 | if (likely(cur_page != NULL)) { | |
f0e2f38b | 141 | (void)ttm_tt_set_page_caching(cur_page, c_state, |
ba4e7d97 TH |
142 | ttm->caching_state); |
143 | } | |
144 | } | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | int 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 | } | |
df67bed9 | 162 | EXPORT_SYMBOL(ttm_tt_set_placement_caching); |
ba4e7d97 | 163 | |
ba4e7d97 TH |
164 | void ttm_tt_destroy(struct ttm_tt *ttm) |
165 | { | |
ba4e7d97 TH |
166 | if (unlikely(ttm == NULL)) |
167 | return; | |
168 | ||
649bf3ca JG |
169 | if (ttm->state == tt_bound) { |
170 | ttm_tt_unbind(ttm); | |
ba4e7d97 TH |
171 | } |
172 | ||
58aa6622 TH |
173 | if (ttm->state == tt_unbound) |
174 | ttm_tt_unpopulate(ttm); | |
ba4e7d97 | 175 | |
5df23979 | 176 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && |
ba4e7d97 TH |
177 | ttm->swap_storage) |
178 | fput(ttm->swap_storage); | |
179 | ||
649bf3ca JG |
180 | ttm->swap_storage = NULL; |
181 | ttm->func->destroy(ttm); | |
ba4e7d97 TH |
182 | } |
183 | ||
649bf3ca JG |
184 | int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, |
185 | unsigned long size, uint32_t page_flags, | |
186 | struct page *dummy_read_page) | |
ba4e7d97 | 187 | { |
649bf3ca | 188 | ttm->bdev = bdev; |
a987fcaa | 189 | ttm->glob = bdev->glob; |
ba4e7d97 | 190 | ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
ba4e7d97 TH |
191 | ttm->caching_state = tt_cached; |
192 | ttm->page_flags = page_flags; | |
ba4e7d97 | 193 | ttm->dummy_read_page = dummy_read_page; |
649bf3ca | 194 | ttm->state = tt_unpopulated; |
dea7e0ac | 195 | ttm->swap_storage = NULL; |
ba4e7d97 TH |
196 | |
197 | ttm_tt_alloc_page_directory(ttm); | |
8e7e7052 | 198 | if (!ttm->pages) { |
ba4e7d97 | 199 | ttm_tt_destroy(ttm); |
25d0479a | 200 | pr_err("Failed allocating page table\n"); |
649bf3ca | 201 | return -ENOMEM; |
ba4e7d97 | 202 | } |
649bf3ca | 203 | return 0; |
ba4e7d97 | 204 | } |
649bf3ca | 205 | EXPORT_SYMBOL(ttm_tt_init); |
ba4e7d97 | 206 | |
8e7e7052 JG |
207 | void ttm_tt_fini(struct ttm_tt *ttm) |
208 | { | |
209 | drm_free_large(ttm->pages); | |
210 | ttm->pages = NULL; | |
211 | } | |
212 | EXPORT_SYMBOL(ttm_tt_fini); | |
213 | ||
214 | int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, | |
215 | unsigned long size, uint32_t page_flags, | |
216 | struct page *dummy_read_page) | |
217 | { | |
218 | struct ttm_tt *ttm = &ttm_dma->ttm; | |
219 | ||
220 | ttm->bdev = bdev; | |
221 | ttm->glob = bdev->glob; | |
222 | ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
223 | ttm->caching_state = tt_cached; | |
224 | ttm->page_flags = page_flags; | |
225 | ttm->dummy_read_page = dummy_read_page; | |
226 | ttm->state = tt_unpopulated; | |
dea7e0ac | 227 | ttm->swap_storage = NULL; |
8e7e7052 JG |
228 | |
229 | INIT_LIST_HEAD(&ttm_dma->pages_list); | |
230 | ttm_dma_tt_alloc_page_directory(ttm_dma); | |
231 | if (!ttm->pages || !ttm_dma->dma_address) { | |
232 | ttm_tt_destroy(ttm); | |
25d0479a | 233 | pr_err("Failed allocating page table\n"); |
8e7e7052 JG |
234 | return -ENOMEM; |
235 | } | |
236 | return 0; | |
237 | } | |
238 | EXPORT_SYMBOL(ttm_dma_tt_init); | |
239 | ||
240 | void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) | |
241 | { | |
242 | struct ttm_tt *ttm = &ttm_dma->ttm; | |
243 | ||
244 | drm_free_large(ttm->pages); | |
245 | ttm->pages = NULL; | |
246 | drm_free_large(ttm_dma->dma_address); | |
247 | ttm_dma->dma_address = NULL; | |
248 | } | |
249 | EXPORT_SYMBOL(ttm_dma_tt_fini); | |
250 | ||
ba4e7d97 TH |
251 | void ttm_tt_unbind(struct ttm_tt *ttm) |
252 | { | |
253 | int ret; | |
ba4e7d97 TH |
254 | |
255 | if (ttm->state == tt_bound) { | |
649bf3ca | 256 | ret = ttm->func->unbind(ttm); |
ba4e7d97 TH |
257 | BUG_ON(ret); |
258 | ttm->state = tt_unbound; | |
259 | } | |
260 | } | |
261 | ||
262 | int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) | |
263 | { | |
264 | int ret = 0; | |
ba4e7d97 TH |
265 | |
266 | if (!ttm) | |
267 | return -EINVAL; | |
268 | ||
269 | if (ttm->state == tt_bound) | |
270 | return 0; | |
271 | ||
b1e5f172 | 272 | ret = ttm->bdev->driver->ttm_tt_populate(ttm); |
ba4e7d97 TH |
273 | if (ret) |
274 | return ret; | |
275 | ||
649bf3ca | 276 | ret = ttm->func->bind(ttm, bo_mem); |
7dcebb52 | 277 | if (unlikely(ret != 0)) |
ba4e7d97 | 278 | return ret; |
ba4e7d97 TH |
279 | |
280 | ttm->state = tt_bound; | |
281 | ||
ba4e7d97 TH |
282 | return 0; |
283 | } | |
284 | EXPORT_SYMBOL(ttm_tt_bind); | |
285 | ||
b1e5f172 | 286 | int ttm_tt_swapin(struct ttm_tt *ttm) |
ba4e7d97 TH |
287 | { |
288 | struct address_space *swap_space; | |
289 | struct file *swap_storage; | |
290 | struct page *from_page; | |
291 | struct page *to_page; | |
ba4e7d97 | 292 | int i; |
290e5505 | 293 | int ret = -ENOMEM; |
ba4e7d97 | 294 | |
ba4e7d97 TH |
295 | swap_storage = ttm->swap_storage; |
296 | BUG_ON(swap_storage == NULL); | |
297 | ||
496ad9aa | 298 | swap_space = file_inode(swap_storage)->i_mapping; |
ba4e7d97 TH |
299 | |
300 | for (i = 0; i < ttm->num_pages; ++i) { | |
3142b651 | 301 | from_page = shmem_read_mapping_page(swap_space, i); |
290e5505 MM |
302 | if (IS_ERR(from_page)) { |
303 | ret = PTR_ERR(from_page); | |
ba4e7d97 | 304 | goto out_err; |
290e5505 | 305 | } |
b1e5f172 | 306 | to_page = ttm->pages[i]; |
ba4e7d97 TH |
307 | if (unlikely(to_page == NULL)) |
308 | goto out_err; | |
309 | ||
259a290e | 310 | copy_highpage(to_page, from_page); |
ba4e7d97 TH |
311 | page_cache_release(from_page); |
312 | } | |
313 | ||
5df23979 | 314 | if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) |
ba4e7d97 TH |
315 | fput(swap_storage); |
316 | ttm->swap_storage = NULL; | |
317 | ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; | |
318 | ||
319 | return 0; | |
320 | out_err: | |
290e5505 | 321 | return ret; |
ba4e7d97 TH |
322 | } |
323 | ||
5df23979 | 324 | int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage) |
ba4e7d97 TH |
325 | { |
326 | struct address_space *swap_space; | |
327 | struct file *swap_storage; | |
328 | struct page *from_page; | |
329 | struct page *to_page; | |
ba4e7d97 | 330 | int i; |
290e5505 | 331 | int ret = -ENOMEM; |
ba4e7d97 TH |
332 | |
333 | BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); | |
334 | BUG_ON(ttm->caching_state != tt_cached); | |
335 | ||
5df23979 | 336 | if (!persistent_swap_storage) { |
ba4e7d97 TH |
337 | swap_storage = shmem_file_setup("ttm swap", |
338 | ttm->num_pages << PAGE_SHIFT, | |
339 | 0); | |
340 | if (unlikely(IS_ERR(swap_storage))) { | |
25d0479a | 341 | pr_err("Failed allocating swap storage\n"); |
290e5505 | 342 | return PTR_ERR(swap_storage); |
ba4e7d97 TH |
343 | } |
344 | } else | |
5df23979 | 345 | swap_storage = persistent_swap_storage; |
ba4e7d97 | 346 | |
496ad9aa | 347 | swap_space = file_inode(swap_storage)->i_mapping; |
ba4e7d97 TH |
348 | |
349 | for (i = 0; i < ttm->num_pages; ++i) { | |
350 | from_page = ttm->pages[i]; | |
351 | if (unlikely(from_page == NULL)) | |
352 | continue; | |
3142b651 | 353 | to_page = shmem_read_mapping_page(swap_space, i); |
290e5505 MM |
354 | if (unlikely(IS_ERR(to_page))) { |
355 | ret = PTR_ERR(to_page); | |
ba4e7d97 | 356 | goto out_err; |
290e5505 | 357 | } |
259a290e | 358 | copy_highpage(to_page, from_page); |
ba4e7d97 TH |
359 | set_page_dirty(to_page); |
360 | mark_page_accessed(to_page); | |
361 | page_cache_release(to_page); | |
362 | } | |
363 | ||
58aa6622 | 364 | ttm_tt_unpopulate(ttm); |
ba4e7d97 TH |
365 | ttm->swap_storage = swap_storage; |
366 | ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; | |
5df23979 JE |
367 | if (persistent_swap_storage) |
368 | ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP; | |
ba4e7d97 TH |
369 | |
370 | return 0; | |
371 | out_err: | |
5df23979 | 372 | if (!persistent_swap_storage) |
ba4e7d97 TH |
373 | fput(swap_storage); |
374 | ||
290e5505 | 375 | return ret; |
ba4e7d97 | 376 | } |
58aa6622 TH |
377 | |
378 | static void ttm_tt_clear_mapping(struct ttm_tt *ttm) | |
379 | { | |
380 | pgoff_t i; | |
381 | struct page **page = ttm->pages; | |
382 | ||
1b76af5c TH |
383 | if (ttm->page_flags & TTM_PAGE_FLAG_SG) |
384 | return; | |
385 | ||
58aa6622 TH |
386 | for (i = 0; i < ttm->num_pages; ++i) { |
387 | (*page)->mapping = NULL; | |
388 | (*page++)->index = 0; | |
389 | } | |
390 | } | |
391 | ||
392 | void ttm_tt_unpopulate(struct ttm_tt *ttm) | |
393 | { | |
394 | if (ttm->state == tt_unpopulated) | |
395 | return; | |
396 | ||
397 | ttm_tt_clear_mapping(ttm); | |
398 | ttm->bdev->driver->ttm_tt_unpopulate(ttm); | |
399 | } |