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 * Copyright (c) 2013 The FreeBSD Foundation 32 * All rights reserved. 33 * 34 * Portions of this software were developed by Konstantin Belousov 35 * <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation. 36 * 37 * $FreeBSD: head/sys/dev/drm2/ttm/ttm_tt.c 251452 2013-06-06 06:17:20Z alc $ 38 */ 39 40 #define pr_fmt(fmt) "[TTM] " fmt 41 42 #include <drm/drmP.h> 43 44 #include <linux/export.h> 45 #include <drm/drm_mem_util.h> 46 #include <drm/ttm/ttm_module.h> 47 #include <drm/ttm/ttm_bo_driver.h> 48 #include <drm/ttm/ttm_placement.h> 49 #include <drm/ttm/ttm_page_alloc.h> 50 51 #include <vm/vm_page2.h> 52 53 /** 54 * Allocates storage for pointers to the pages that back the ttm. 55 */ 56 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) 57 { 58 ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*)); 59 } 60 61 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) 62 { 63 ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, sizeof(void*)); 64 ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages, 65 sizeof(*ttm->dma_address)); 66 } 67 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 73 /* XXXKIB our VM does not need this. */ 74 #if 0 75 if (c_old != tt_cached) { 76 /* p isn't in the default caching state, set it to 77 * writeback first to free its current memtype. */ 78 pmap_page_set_memattr(p, VM_MEMATTR_WRITE_BACK); 79 } 80 #endif 81 82 if (c_new == tt_wc) 83 pmap_page_set_memattr((struct vm_page *)p, VM_MEMATTR_WRITE_COMBINING); 84 else if (c_new == tt_uncached) 85 pmap_page_set_memattr((struct vm_page *)p, VM_MEMATTR_UNCACHEABLE); 86 87 return (0); 88 } 89 90 /* 91 * Change caching policy for the linear kernel map 92 * for range of pages in a ttm. 93 */ 94 95 static int ttm_tt_set_caching(struct ttm_tt *ttm, 96 enum ttm_caching_state c_state) 97 { 98 int i, j; 99 struct page *cur_page; 100 int ret; 101 102 if (ttm->caching_state == c_state) 103 return 0; 104 105 if (ttm->state == tt_unpopulated) { 106 /* Change caching but don't populate */ 107 ttm->caching_state = c_state; 108 return 0; 109 } 110 111 if (ttm->caching_state == tt_cached) 112 drm_clflush_pages(ttm->pages, ttm->num_pages); 113 114 for (i = 0; i < ttm->num_pages; ++i) { 115 cur_page = ttm->pages[i]; 116 if (likely(cur_page != NULL)) { 117 ret = ttm_tt_set_page_caching(cur_page, 118 ttm->caching_state, 119 c_state); 120 if (unlikely(ret != 0)) 121 goto out_err; 122 } 123 } 124 125 ttm->caching_state = c_state; 126 127 return 0; 128 129 out_err: 130 for (j = 0; j < i; ++j) { 131 cur_page = ttm->pages[j]; 132 if (likely(cur_page != NULL)) { 133 (void)ttm_tt_set_page_caching(cur_page, c_state, 134 ttm->caching_state); 135 } 136 } 137 138 return ret; 139 } 140 141 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) 142 { 143 enum ttm_caching_state state; 144 145 if (placement & TTM_PL_FLAG_WC) 146 state = tt_wc; 147 else if (placement & TTM_PL_FLAG_UNCACHED) 148 state = tt_uncached; 149 else 150 state = tt_cached; 151 152 return ttm_tt_set_caching(ttm, state); 153 } 154 EXPORT_SYMBOL(ttm_tt_set_placement_caching); 155 156 void ttm_tt_destroy(struct ttm_tt *ttm) 157 { 158 if (unlikely(ttm == NULL)) 159 return; 160 161 if (ttm->state == tt_bound) { 162 ttm_tt_unbind(ttm); 163 } 164 165 if (likely(ttm->pages != NULL)) { 166 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 167 } 168 169 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && 170 ttm->swap_storage) 171 vm_object_deallocate(ttm->swap_storage); 172 173 ttm->swap_storage = NULL; 174 ttm->func->destroy(ttm); 175 } 176 177 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, 178 unsigned long size, uint32_t page_flags, 179 struct page *dummy_read_page) 180 { 181 ttm->bdev = bdev; 182 ttm->glob = bdev->glob; 183 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 184 ttm->caching_state = tt_cached; 185 ttm->page_flags = page_flags; 186 ttm->dummy_read_page = dummy_read_page; 187 ttm->state = tt_unpopulated; 188 ttm->swap_storage = NULL; 189 190 ttm_tt_alloc_page_directory(ttm); 191 if (!ttm->pages) { 192 ttm_tt_destroy(ttm); 193 pr_err("Failed allocating page table\n"); 194 return -ENOMEM; 195 } 196 return 0; 197 } 198 EXPORT_SYMBOL(ttm_tt_init); 199 200 void ttm_tt_fini(struct ttm_tt *ttm) 201 { 202 drm_free_large(ttm->pages); 203 ttm->pages = NULL; 204 } 205 EXPORT_SYMBOL(ttm_tt_fini); 206 207 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, 208 unsigned long size, uint32_t page_flags, 209 struct page *dummy_read_page) 210 { 211 struct ttm_tt *ttm = &ttm_dma->ttm; 212 213 ttm->bdev = bdev; 214 ttm->glob = bdev->glob; 215 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 216 ttm->caching_state = tt_cached; 217 ttm->page_flags = page_flags; 218 ttm->dummy_read_page = dummy_read_page; 219 ttm->state = tt_unpopulated; 220 ttm->swap_storage = NULL; 221 222 INIT_LIST_HEAD(&ttm_dma->pages_list); 223 ttm_dma_tt_alloc_page_directory(ttm_dma); 224 if (!ttm->pages || !ttm_dma->dma_address) { 225 ttm_tt_destroy(ttm); 226 pr_err("Failed allocating page table\n"); 227 return -ENOMEM; 228 } 229 return 0; 230 } 231 EXPORT_SYMBOL(ttm_dma_tt_init); 232 233 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) 234 { 235 struct ttm_tt *ttm = &ttm_dma->ttm; 236 237 drm_free_large(ttm->pages); 238 ttm->pages = NULL; 239 drm_free_large(ttm_dma->dma_address); 240 ttm_dma->dma_address = NULL; 241 } 242 EXPORT_SYMBOL(ttm_dma_tt_fini); 243 244 void ttm_tt_unbind(struct ttm_tt *ttm) 245 { 246 int ret; 247 248 if (ttm->state == tt_bound) { 249 ret = ttm->func->unbind(ttm); 250 BUG_ON(ret); 251 ttm->state = tt_unbound; 252 } 253 } 254 255 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 256 { 257 int ret = 0; 258 259 if (!ttm) 260 return -EINVAL; 261 262 if (ttm->state == tt_bound) 263 return 0; 264 265 ret = ttm->bdev->driver->ttm_tt_populate(ttm); 266 if (ret) 267 return ret; 268 269 ret = ttm->func->bind(ttm, bo_mem); 270 if (unlikely(ret != 0)) 271 return ret; 272 273 ttm->state = tt_bound; 274 275 return 0; 276 } 277 EXPORT_SYMBOL(ttm_tt_bind); 278 279 int ttm_tt_swapin(struct ttm_tt *ttm) 280 { 281 vm_object_t obj; 282 vm_page_t from_page, to_page; 283 int i, ret, rv; 284 285 obj = ttm->swap_storage; 286 287 VM_OBJECT_LOCK(obj); 288 vm_object_pip_add(obj, 1); 289 for (i = 0; i < ttm->num_pages; ++i) { 290 from_page = vm_page_grab(obj, i, VM_ALLOC_NORMAL | 291 VM_ALLOC_RETRY); 292 if (from_page->valid != VM_PAGE_BITS_ALL) { 293 if (vm_pager_has_page(obj, i)) { 294 rv = vm_pager_get_page(obj, &from_page, 1); 295 if (rv != VM_PAGER_OK) { 296 vm_page_free(from_page); 297 ret = -EIO; 298 goto err_ret; 299 } 300 } else { 301 vm_page_zero_invalid(from_page, TRUE); 302 } 303 } 304 to_page = (struct vm_page *)ttm->pages[i]; 305 if (unlikely(to_page == NULL)) { 306 ret = -ENOMEM; 307 vm_page_wakeup(from_page); 308 goto err_ret; 309 } 310 pmap_copy_page(VM_PAGE_TO_PHYS(from_page), 311 VM_PAGE_TO_PHYS(to_page)); 312 vm_page_wakeup(from_page); 313 } 314 vm_object_pip_wakeup(obj); 315 VM_OBJECT_UNLOCK(obj); 316 317 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) 318 vm_object_deallocate(obj); 319 ttm->swap_storage = NULL; 320 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 321 return (0); 322 323 err_ret: 324 vm_object_pip_wakeup(obj); 325 VM_OBJECT_UNLOCK(obj); 326 return (ret); 327 } 328 329 int ttm_tt_swapout(struct ttm_tt *ttm, vm_object_t persistent_swap_storage) 330 { 331 vm_object_t obj; 332 vm_page_t from_page, to_page; 333 int i; 334 335 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); 336 BUG_ON(ttm->caching_state != tt_cached); 337 338 if (!persistent_swap_storage) { 339 obj = swap_pager_alloc(NULL, 340 IDX_TO_OFF(ttm->num_pages), VM_PROT_DEFAULT, 0); 341 if (obj == NULL) { 342 pr_err("Failed allocating swap storage\n"); 343 return (-ENOMEM); 344 } 345 } else 346 obj = persistent_swap_storage; 347 348 VM_OBJECT_LOCK(obj); 349 vm_object_pip_add(obj, 1); 350 for (i = 0; i < ttm->num_pages; ++i) { 351 from_page = (struct vm_page *)ttm->pages[i]; 352 if (unlikely(from_page == NULL)) 353 continue; 354 to_page = vm_page_grab(obj, i, VM_ALLOC_NORMAL | 355 VM_ALLOC_RETRY); 356 pmap_copy_page(VM_PAGE_TO_PHYS(from_page), 357 VM_PAGE_TO_PHYS(to_page)); 358 to_page->valid = VM_PAGE_BITS_ALL; 359 vm_page_dirty(to_page); 360 vm_page_wakeup(to_page); 361 } 362 vm_object_pip_wakeup(obj); 363 VM_OBJECT_UNLOCK(obj); 364 365 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 366 ttm->swap_storage = obj; 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 } 373