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 #ifdef CONFIG_X86 48 #include <asm/set_memory.h> 49 #endif 50 51 /** 52 * Allocates storage for pointers to the pages that back the ttm. 53 */ 54 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) 55 { 56 ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*)); 57 } 58 59 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) 60 { 61 ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, 62 sizeof(*ttm->ttm.pages) + 63 sizeof(*ttm->dma_address)); 64 ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages); 65 } 66 67 #ifdef CONFIG_X86 68 static inline int ttm_tt_set_page_caching(struct page *p, 69 enum ttm_caching_state c_old, 70 enum ttm_caching_state c_new) 71 { 72 int ret = 0; 73 74 if (PageHighMem(p)) 75 return 0; 76 77 if (c_old != tt_cached) { 78 /* p isn't in the default caching state, set it to 79 * writeback first to free its current memtype. */ 80 81 ret = set_pages_wb(p, 1); 82 if (ret) 83 return ret; 84 } 85 86 if (c_new == tt_wc) 87 ret = set_memory_wc((unsigned long) page_address(p), 1); 88 else if (c_new == tt_uncached) 89 ret = set_pages_uc(p, 1); 90 91 return ret; 92 } 93 #else /* CONFIG_X86 */ 94 static inline int ttm_tt_set_page_caching(struct page *p, 95 enum ttm_caching_state c_old, 96 enum ttm_caching_state c_new) 97 { 98 return 0; 99 } 100 #endif /* CONFIG_X86 */ 101 102 /* 103 * Change caching policy for the linear kernel map 104 * for range of pages in a ttm. 105 */ 106 107 static int ttm_tt_set_caching(struct ttm_tt *ttm, 108 enum ttm_caching_state c_state) 109 { 110 int i, j; 111 struct page *cur_page; 112 int ret; 113 114 if (ttm->caching_state == c_state) 115 return 0; 116 117 if (ttm->state == tt_unpopulated) { 118 /* Change caching but don't populate */ 119 ttm->caching_state = c_state; 120 return 0; 121 } 122 123 if (ttm->caching_state == tt_cached) 124 drm_clflush_pages(ttm->pages, ttm->num_pages); 125 126 for (i = 0; i < ttm->num_pages; ++i) { 127 cur_page = ttm->pages[i]; 128 if (likely(cur_page != NULL)) { 129 ret = ttm_tt_set_page_caching(cur_page, 130 ttm->caching_state, 131 c_state); 132 if (unlikely(ret != 0)) 133 goto out_err; 134 } 135 } 136 137 ttm->caching_state = c_state; 138 139 return 0; 140 141 out_err: 142 for (j = 0; j < i; ++j) { 143 cur_page = ttm->pages[j]; 144 if (likely(cur_page != NULL)) { 145 (void)ttm_tt_set_page_caching(cur_page, c_state, 146 ttm->caching_state); 147 } 148 } 149 150 return ret; 151 } 152 153 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) 154 { 155 enum ttm_caching_state state; 156 157 if (placement & TTM_PL_FLAG_WC) 158 state = tt_wc; 159 else if (placement & TTM_PL_FLAG_UNCACHED) 160 state = tt_uncached; 161 else 162 state = tt_cached; 163 164 return ttm_tt_set_caching(ttm, state); 165 } 166 EXPORT_SYMBOL(ttm_tt_set_placement_caching); 167 168 void ttm_tt_destroy(struct ttm_tt *ttm) 169 { 170 if (ttm == NULL) 171 return; 172 173 ttm_tt_unbind(ttm); 174 175 if (ttm->state == tt_unbound) 176 ttm_tt_unpopulate(ttm); 177 178 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && 179 ttm->swap_storage) 180 fput(ttm->swap_storage); 181 182 ttm->swap_storage = NULL; 183 ttm->func->destroy(ttm); 184 } 185 186 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, 187 unsigned long size, uint32_t page_flags, 188 struct page *dummy_read_page) 189 { 190 ttm->bdev = bdev; 191 ttm->glob = bdev->glob; 192 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 193 ttm->caching_state = tt_cached; 194 ttm->page_flags = page_flags; 195 ttm->dummy_read_page = dummy_read_page; 196 ttm->state = tt_unpopulated; 197 ttm->swap_storage = NULL; 198 199 ttm_tt_alloc_page_directory(ttm); 200 if (!ttm->pages) { 201 ttm_tt_destroy(ttm); 202 pr_err("Failed allocating page table\n"); 203 return -ENOMEM; 204 } 205 return 0; 206 } 207 EXPORT_SYMBOL(ttm_tt_init); 208 209 void ttm_tt_fini(struct ttm_tt *ttm) 210 { 211 drm_free_large(ttm->pages); 212 ttm->pages = NULL; 213 } 214 EXPORT_SYMBOL(ttm_tt_fini); 215 216 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, 217 unsigned long size, uint32_t page_flags, 218 struct page *dummy_read_page) 219 { 220 struct ttm_tt *ttm = &ttm_dma->ttm; 221 222 ttm->bdev = bdev; 223 ttm->glob = bdev->glob; 224 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 225 ttm->caching_state = tt_cached; 226 ttm->page_flags = page_flags; 227 ttm->dummy_read_page = dummy_read_page; 228 ttm->state = tt_unpopulated; 229 ttm->swap_storage = NULL; 230 231 INIT_LIST_HEAD(&ttm_dma->pages_list); 232 ttm_dma_tt_alloc_page_directory(ttm_dma); 233 if (!ttm->pages) { 234 ttm_tt_destroy(ttm); 235 pr_err("Failed allocating page table\n"); 236 return -ENOMEM; 237 } 238 return 0; 239 } 240 EXPORT_SYMBOL(ttm_dma_tt_init); 241 242 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) 243 { 244 struct ttm_tt *ttm = &ttm_dma->ttm; 245 246 drm_free_large(ttm->pages); 247 ttm->pages = NULL; 248 ttm_dma->dma_address = NULL; 249 } 250 EXPORT_SYMBOL(ttm_dma_tt_fini); 251 252 void 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 } 262 263 int 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 } 285 EXPORT_SYMBOL(ttm_tt_bind); 286 287 int 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 int i; 294 int ret = -ENOMEM; 295 296 swap_storage = ttm->swap_storage; 297 BUG_ON(swap_storage == NULL); 298 299 swap_space = swap_storage->f_mapping; 300 301 for (i = 0; i < ttm->num_pages; ++i) { 302 from_page = shmem_read_mapping_page(swap_space, i); 303 if (IS_ERR(from_page)) { 304 ret = PTR_ERR(from_page); 305 goto out_err; 306 } 307 to_page = ttm->pages[i]; 308 if (unlikely(to_page == NULL)) 309 goto out_err; 310 311 copy_highpage(to_page, from_page); 312 put_page(from_page); 313 } 314 315 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) 316 fput(swap_storage); 317 ttm->swap_storage = NULL; 318 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 319 320 return 0; 321 out_err: 322 return ret; 323 } 324 325 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage) 326 { 327 struct address_space *swap_space; 328 struct file *swap_storage; 329 struct page *from_page; 330 struct page *to_page; 331 int i; 332 int ret = -ENOMEM; 333 334 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); 335 BUG_ON(ttm->caching_state != tt_cached); 336 337 if (!persistent_swap_storage) { 338 swap_storage = shmem_file_setup("ttm swap", 339 ttm->num_pages << PAGE_SHIFT, 340 0); 341 if (IS_ERR(swap_storage)) { 342 pr_err("Failed allocating swap storage\n"); 343 return PTR_ERR(swap_storage); 344 } 345 } else 346 swap_storage = persistent_swap_storage; 347 348 swap_space = swap_storage->f_mapping; 349 350 for (i = 0; i < ttm->num_pages; ++i) { 351 from_page = ttm->pages[i]; 352 if (unlikely(from_page == NULL)) 353 continue; 354 to_page = shmem_read_mapping_page(swap_space, i); 355 if (IS_ERR(to_page)) { 356 ret = PTR_ERR(to_page); 357 goto out_err; 358 } 359 copy_highpage(to_page, from_page); 360 set_page_dirty(to_page); 361 mark_page_accessed(to_page); 362 put_page(to_page); 363 } 364 365 ttm_tt_unpopulate(ttm); 366 ttm->swap_storage = swap_storage; 367 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; 368 if (persistent_swap_storage) 369 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP; 370 371 return 0; 372 out_err: 373 if (!persistent_swap_storage) 374 fput(swap_storage); 375 376 return ret; 377 } 378 379 static void ttm_tt_clear_mapping(struct ttm_tt *ttm) 380 { 381 pgoff_t i; 382 struct page **page = ttm->pages; 383 384 if (ttm->page_flags & TTM_PAGE_FLAG_SG) 385 return; 386 387 for (i = 0; i < ttm->num_pages; ++i) { 388 (*page)->mapping = NULL; 389 (*page++)->index = 0; 390 } 391 } 392 393 void ttm_tt_unpopulate(struct ttm_tt *ttm) 394 { 395 if (ttm->state == tt_unpopulated) 396 return; 397 398 ttm_tt_clear_mapping(ttm); 399 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 400 } 401