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, sizeof(void*)); 59 ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages, 60 sizeof(*ttm->dma_address)); 61 } 62 63 #ifdef CONFIG_X86 64 static 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 */ 90 static 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 */ 102 103 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; 112 113 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; 136 137 out_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 } 148 149 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 } 162 EXPORT_SYMBOL(ttm_tt_set_placement_caching); 163 164 void 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 (ttm->state == tt_unbound) 174 ttm_tt_unpopulate(ttm); 175 176 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && 177 ttm->swap_storage) 178 fput(ttm->swap_storage); 179 180 ttm->swap_storage = NULL; 181 ttm->func->destroy(ttm); 182 } 183 184 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) 187 { 188 ttm->bdev = bdev; 189 ttm->glob = bdev->glob; 190 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 191 ttm->caching_state = tt_cached; 192 ttm->page_flags = page_flags; 193 ttm->dummy_read_page = dummy_read_page; 194 ttm->state = tt_unpopulated; 195 ttm->swap_storage = NULL; 196 197 ttm_tt_alloc_page_directory(ttm); 198 if (!ttm->pages) { 199 ttm_tt_destroy(ttm); 200 pr_err("Failed allocating page table\n"); 201 return -ENOMEM; 202 } 203 return 0; 204 } 205 EXPORT_SYMBOL(ttm_tt_init); 206 207 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; 227 ttm->swap_storage = NULL; 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); 233 pr_err("Failed allocating page table\n"); 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); 250 251 void ttm_tt_unbind(struct ttm_tt *ttm) 252 { 253 int ret; 254 255 if (ttm->state == tt_bound) { 256 ret = ttm->func->unbind(ttm); 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; 265 266 if (!ttm) 267 return -EINVAL; 268 269 if (ttm->state == tt_bound) 270 return 0; 271 272 ret = ttm->bdev->driver->ttm_tt_populate(ttm); 273 if (ret) 274 return ret; 275 276 ret = ttm->func->bind(ttm, bo_mem); 277 if (unlikely(ret != 0)) 278 return ret; 279 280 ttm->state = tt_bound; 281 282 return 0; 283 } 284 EXPORT_SYMBOL(ttm_tt_bind); 285 286 int ttm_tt_swapin(struct ttm_tt *ttm) 287 { 288 struct address_space *swap_space; 289 struct file *swap_storage; 290 struct page *from_page; 291 struct page *to_page; 292 int i; 293 int ret = -ENOMEM; 294 295 swap_storage = ttm->swap_storage; 296 BUG_ON(swap_storage == NULL); 297 298 swap_space = file_inode(swap_storage)->i_mapping; 299 300 for (i = 0; i < ttm->num_pages; ++i) { 301 from_page = shmem_read_mapping_page(swap_space, i); 302 if (IS_ERR(from_page)) { 303 ret = PTR_ERR(from_page); 304 goto out_err; 305 } 306 to_page = ttm->pages[i]; 307 if (unlikely(to_page == NULL)) 308 goto out_err; 309 310 copy_highpage(to_page, from_page); 311 page_cache_release(from_page); 312 } 313 314 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) 315 fput(swap_storage); 316 ttm->swap_storage = NULL; 317 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 318 319 return 0; 320 out_err: 321 return ret; 322 } 323 324 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage) 325 { 326 struct address_space *swap_space; 327 struct file *swap_storage; 328 struct page *from_page; 329 struct page *to_page; 330 int i; 331 int ret = -ENOMEM; 332 333 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); 334 BUG_ON(ttm->caching_state != tt_cached); 335 336 if (!persistent_swap_storage) { 337 swap_storage = shmem_file_setup("ttm swap", 338 ttm->num_pages << PAGE_SHIFT, 339 0); 340 if (unlikely(IS_ERR(swap_storage))) { 341 pr_err("Failed allocating swap storage\n"); 342 return PTR_ERR(swap_storage); 343 } 344 } else 345 swap_storage = persistent_swap_storage; 346 347 swap_space = file_inode(swap_storage)->i_mapping; 348 349 for (i = 0; i < ttm->num_pages; ++i) { 350 from_page = ttm->pages[i]; 351 if (unlikely(from_page == NULL)) 352 continue; 353 to_page = shmem_read_mapping_page(swap_space, i); 354 if (unlikely(IS_ERR(to_page))) { 355 ret = PTR_ERR(to_page); 356 goto out_err; 357 } 358 copy_highpage(to_page, from_page); 359 set_page_dirty(to_page); 360 mark_page_accessed(to_page); 361 page_cache_release(to_page); 362 } 363 364 ttm_tt_unpopulate(ttm); 365 ttm->swap_storage = swap_storage; 366 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; 367 if (persistent_swap_storage) 368 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP; 369 370 return 0; 371 out_err: 372 if (!persistent_swap_storage) 373 fput(swap_storage); 374 375 return ret; 376 } 377 378 static void ttm_tt_clear_mapping(struct ttm_tt *ttm) 379 { 380 pgoff_t i; 381 struct page **page = ttm->pages; 382 383 if (ttm->page_flags & TTM_PAGE_FLAG_SG) 384 return; 385 386 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 } 400