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_mem_util.h> 42 #include <drm/ttm/ttm_module.h> 43 #include <drm/ttm/ttm_bo_driver.h> 44 #include <drm/ttm/ttm_placement.h> 45 #include <drm/ttm/ttm_page_alloc.h> 46 47 /** 48 * Allocates storage for pointers to the pages that back the ttm. 49 */ 50 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) 51 { 52 ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*)); 53 } 54 55 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) 56 { 57 ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, 58 sizeof(*ttm->ttm.pages) + 59 sizeof(*ttm->dma_address) + 60 sizeof(*ttm->cpu_address)); 61 ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages); 62 ttm->dma_address = (void *) (ttm->cpu_address + ttm->ttm.num_pages); 63 } 64 65 #ifdef CONFIG_X86 66 static inline int ttm_tt_set_page_caching(struct page *p, 67 enum ttm_caching_state c_old, 68 enum ttm_caching_state c_new) 69 { 70 int ret = 0; 71 72 #if 0 73 if (PageHighMem(p)) 74 return 0; 75 #endif 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 pmap_page_set_memattr((struct vm_page *)p, VM_MEMATTR_WRITE_COMBINING); 88 else if (c_new == tt_uncached) 89 pmap_page_set_memattr((struct vm_page *)p, VM_MEMATTR_UNCACHEABLE); 90 91 return (0); 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 (unlikely(ttm == NULL)) 171 return; 172 173 if (ttm->state == tt_bound) { 174 ttm_tt_unbind(ttm); 175 } 176 177 if (ttm->state == tt_unbound) 178 ttm_tt_unpopulate(ttm); 179 180 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && 181 ttm->swap_storage) 182 vm_object_deallocate(ttm->swap_storage); 183 184 ttm->swap_storage = NULL; 185 ttm->func->destroy(ttm); 186 } 187 188 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, 189 unsigned long size, uint32_t page_flags, 190 struct page *dummy_read_page) 191 { 192 ttm->bdev = bdev; 193 ttm->glob = bdev->glob; 194 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 195 ttm->caching_state = tt_cached; 196 ttm->page_flags = page_flags; 197 ttm->dummy_read_page = dummy_read_page; 198 ttm->state = tt_unpopulated; 199 ttm->swap_storage = NULL; 200 201 ttm_tt_alloc_page_directory(ttm); 202 if (!ttm->pages) { 203 ttm_tt_destroy(ttm); 204 pr_err("Failed allocating page table\n"); 205 return -ENOMEM; 206 } 207 return 0; 208 } 209 EXPORT_SYMBOL(ttm_tt_init); 210 211 void ttm_tt_fini(struct ttm_tt *ttm) 212 { 213 drm_free_large(ttm->pages); 214 ttm->pages = NULL; 215 } 216 EXPORT_SYMBOL(ttm_tt_fini); 217 218 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, 219 unsigned long size, uint32_t page_flags, 220 struct page *dummy_read_page) 221 { 222 struct ttm_tt *ttm = &ttm_dma->ttm; 223 224 ttm->bdev = bdev; 225 ttm->glob = bdev->glob; 226 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 227 ttm->caching_state = tt_cached; 228 ttm->page_flags = page_flags; 229 ttm->dummy_read_page = dummy_read_page; 230 ttm->state = tt_unpopulated; 231 ttm->swap_storage = NULL; 232 233 INIT_LIST_HEAD(&ttm_dma->pages_list); 234 ttm_dma_tt_alloc_page_directory(ttm_dma); 235 if (!ttm->pages) { 236 ttm_tt_destroy(ttm); 237 pr_err("Failed allocating page table\n"); 238 return -ENOMEM; 239 } 240 return 0; 241 } 242 EXPORT_SYMBOL(ttm_dma_tt_init); 243 244 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) 245 { 246 struct ttm_tt *ttm = &ttm_dma->ttm; 247 248 drm_free_large(ttm->pages); 249 ttm->pages = NULL; 250 ttm_dma->cpu_address = NULL; 251 ttm_dma->dma_address = NULL; 252 } 253 EXPORT_SYMBOL(ttm_dma_tt_fini); 254 255 void ttm_tt_unbind(struct ttm_tt *ttm) 256 { 257 int ret; 258 259 if (ttm->state == tt_bound) { 260 ret = ttm->func->unbind(ttm); 261 BUG_ON(ret); 262 ttm->state = tt_unbound; 263 } 264 } 265 266 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 267 { 268 int ret = 0; 269 270 if (!ttm) 271 return -EINVAL; 272 273 if (ttm->state == tt_bound) 274 return 0; 275 276 ret = ttm->bdev->driver->ttm_tt_populate(ttm); 277 if (ret) 278 return ret; 279 280 ret = ttm->func->bind(ttm, bo_mem); 281 if (unlikely(ret != 0)) 282 return ret; 283 284 ttm->state = tt_bound; 285 286 return 0; 287 } 288 EXPORT_SYMBOL(ttm_tt_bind); 289 290 int ttm_tt_swapin(struct ttm_tt *ttm) 291 { 292 vm_object_t obj; 293 struct page *from_page; 294 struct page *to_page; 295 int i; 296 int ret = -ENOMEM; 297 298 obj = ttm->swap_storage; 299 300 VM_OBJECT_LOCK(obj); 301 vm_object_pip_add(obj, 1); 302 for (i = 0; i < ttm->num_pages; ++i) { 303 from_page = (struct page *)vm_page_grab(obj, i, VM_ALLOC_NORMAL | 304 VM_ALLOC_RETRY); 305 if (((struct vm_page *)from_page)->valid != VM_PAGE_BITS_ALL) { 306 if (vm_pager_has_page(obj, i)) { 307 if (vm_pager_get_page(obj, (struct vm_page **)&from_page, 1) != VM_PAGER_OK) { 308 vm_page_free((struct vm_page *)from_page); 309 ret = -EIO; 310 goto out_err; 311 } 312 } else { 313 vm_page_zero_invalid((struct vm_page *)from_page, TRUE); 314 } 315 } 316 to_page = ttm->pages[i]; 317 if (unlikely(to_page == NULL)) { 318 vm_page_wakeup((struct vm_page *)from_page); 319 goto out_err; 320 } 321 322 pmap_copy_page(VM_PAGE_TO_PHYS((struct vm_page *)from_page), 323 VM_PAGE_TO_PHYS((struct vm_page *)to_page)); 324 vm_page_wakeup((struct vm_page *)from_page); 325 } 326 vm_object_pip_wakeup(obj); 327 VM_OBJECT_UNLOCK(obj); 328 329 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) 330 vm_object_deallocate(obj); 331 ttm->swap_storage = NULL; 332 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 333 334 return 0; 335 out_err: 336 vm_object_pip_wakeup(obj); 337 VM_OBJECT_UNLOCK(obj); 338 return ret; 339 } 340 341 int ttm_tt_swapout(struct ttm_tt *ttm, vm_object_t persistent_swap_storage) 342 { 343 vm_object_t obj; 344 vm_page_t from_page, to_page; 345 int i; 346 347 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); 348 BUG_ON(ttm->caching_state != tt_cached); 349 350 if (!persistent_swap_storage) { 351 obj = swap_pager_alloc(NULL, 352 IDX_TO_OFF(ttm->num_pages), VM_PROT_DEFAULT, 0); 353 if (obj == NULL) { 354 pr_err("Failed allocating swap storage\n"); 355 return (-ENOMEM); 356 } 357 } else 358 obj = persistent_swap_storage; 359 360 VM_OBJECT_LOCK(obj); 361 vm_object_pip_add(obj, 1); 362 for (i = 0; i < ttm->num_pages; ++i) { 363 from_page = (struct vm_page *)ttm->pages[i]; 364 if (unlikely(from_page == NULL)) 365 continue; 366 to_page = vm_page_grab(obj, i, VM_ALLOC_NORMAL | 367 VM_ALLOC_RETRY); 368 pmap_copy_page(VM_PAGE_TO_PHYS(from_page), 369 VM_PAGE_TO_PHYS(to_page)); 370 to_page->valid = VM_PAGE_BITS_ALL; 371 vm_page_dirty(to_page); 372 vm_page_wakeup(to_page); 373 } 374 vm_object_pip_wakeup(obj); 375 VM_OBJECT_UNLOCK(obj); 376 377 ttm_tt_unpopulate(ttm); 378 ttm->swap_storage = obj; 379 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; 380 if (persistent_swap_storage) 381 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP; 382 383 return 0; 384 } 385 386 static void ttm_tt_clear_mapping(struct ttm_tt *ttm) 387 { 388 #if 0 389 pgoff_t i; 390 struct page **page = ttm->pages; 391 392 if (ttm->page_flags & TTM_PAGE_FLAG_SG) 393 return; 394 395 for (i = 0; i < ttm->num_pages; ++i) { 396 (*page)->mapping = NULL; 397 (*page++)->index = 0; 398 } 399 #endif 400 } 401 402 void ttm_tt_unpopulate(struct ttm_tt *ttm) 403 { 404 if (ttm->state == tt_unpopulated) 405 return; 406 407 ttm_tt_clear_mapping(ttm); 408 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 409 } 410