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