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->bdev->driver->ttm_tt_unpopulate(ttm); 175 } 176 177 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && 178 ttm->swap_storage) 179 fput(ttm->swap_storage); 180 181 ttm->swap_storage = NULL; 182 ttm->func->destroy(ttm); 183 } 184 185 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, 186 unsigned long size, uint32_t page_flags, 187 struct page *dummy_read_page) 188 { 189 ttm->bdev = bdev; 190 ttm->glob = bdev->glob; 191 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 192 ttm->caching_state = tt_cached; 193 ttm->page_flags = page_flags; 194 ttm->dummy_read_page = dummy_read_page; 195 ttm->state = tt_unpopulated; 196 ttm->swap_storage = NULL; 197 198 ttm_tt_alloc_page_directory(ttm); 199 if (!ttm->pages) { 200 ttm_tt_destroy(ttm); 201 pr_err("Failed allocating page table\n"); 202 return -ENOMEM; 203 } 204 return 0; 205 } 206 EXPORT_SYMBOL(ttm_tt_init); 207 208 void ttm_tt_fini(struct ttm_tt *ttm) 209 { 210 drm_free_large(ttm->pages); 211 ttm->pages = NULL; 212 } 213 EXPORT_SYMBOL(ttm_tt_fini); 214 215 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, 216 unsigned long size, uint32_t page_flags, 217 struct page *dummy_read_page) 218 { 219 struct ttm_tt *ttm = &ttm_dma->ttm; 220 221 ttm->bdev = bdev; 222 ttm->glob = bdev->glob; 223 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 224 ttm->caching_state = tt_cached; 225 ttm->page_flags = page_flags; 226 ttm->dummy_read_page = dummy_read_page; 227 ttm->state = tt_unpopulated; 228 ttm->swap_storage = NULL; 229 230 INIT_LIST_HEAD(&ttm_dma->pages_list); 231 ttm_dma_tt_alloc_page_directory(ttm_dma); 232 if (!ttm->pages || !ttm_dma->dma_address) { 233 ttm_tt_destroy(ttm); 234 pr_err("Failed allocating page table\n"); 235 return -ENOMEM; 236 } 237 return 0; 238 } 239 EXPORT_SYMBOL(ttm_dma_tt_init); 240 241 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) 242 { 243 struct ttm_tt *ttm = &ttm_dma->ttm; 244 245 drm_free_large(ttm->pages); 246 ttm->pages = NULL; 247 drm_free_large(ttm_dma->dma_address); 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 = file_inode(swap_storage)->i_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 page_cache_release(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 (unlikely(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 = file_inode(swap_storage)->i_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 (unlikely(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 page_cache_release(to_page); 363 } 364 365 ttm->bdev->driver->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