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 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <dev/drm2/drmP.h> 42 #include <dev/drm2/ttm/ttm_module.h> 43 #include <dev/drm2/ttm/ttm_bo_driver.h> 44 #include <dev/drm2/ttm/ttm_placement.h> 45 #include <dev/drm2/ttm/ttm_page_alloc.h> 46 47 MALLOC_DEFINE(M_TTM_PD, "ttm_pd", "TTM Page Directories"); 48 49 /** 50 * Allocates storage for pointers to the pages that back the ttm. 51 */ 52 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) 53 { 54 ttm->pages = malloc(ttm->num_pages * sizeof(void *), 55 M_TTM_PD, M_WAITOK | M_ZERO); 56 } 57 58 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) 59 { 60 ttm->ttm.pages = malloc(ttm->ttm.num_pages * sizeof(void *), 61 M_TTM_PD, M_WAITOK | M_ZERO); 62 ttm->dma_address = malloc(ttm->ttm.num_pages * 63 sizeof(*ttm->dma_address), M_TTM_PD, M_WAITOK); 64 } 65 66 #if defined(__i386__) || defined(__amd64__) 67 static inline int ttm_tt_set_page_caching(vm_page_t p, 68 enum ttm_caching_state c_old, 69 enum ttm_caching_state c_new) 70 { 71 72 /* XXXKIB our VM does not need this. */ 73 #if 0 74 if (c_old != tt_cached) { 75 /* p isn't in the default caching state, set it to 76 * writeback first to free its current memtype. */ 77 pmap_page_set_memattr(p, VM_MEMATTR_WRITE_BACK); 78 } 79 #endif 80 81 if (c_new == tt_wc) 82 pmap_page_set_memattr(p, VM_MEMATTR_WRITE_COMBINING); 83 else if (c_new == tt_uncached) 84 pmap_page_set_memattr(p, VM_MEMATTR_UNCACHEABLE); 85 86 return (0); 87 } 88 #else 89 static inline int ttm_tt_set_page_caching(vm_page_t p, 90 enum ttm_caching_state c_old, 91 enum ttm_caching_state c_new) 92 { 93 return 0; 94 } 95 #endif 96 97 /* 98 * Change caching policy for the linear kernel map 99 * for range of pages in a ttm. 100 */ 101 102 static int ttm_tt_set_caching(struct ttm_tt *ttm, 103 enum ttm_caching_state c_state) 104 { 105 int i, j; 106 vm_page_t cur_page; 107 int ret; 108 109 if (ttm->caching_state == c_state) 110 return 0; 111 112 if (ttm->state == tt_unpopulated) { 113 /* Change caching but don't populate */ 114 ttm->caching_state = c_state; 115 return 0; 116 } 117 118 if (ttm->caching_state == tt_cached) 119 drm_clflush_pages(ttm->pages, ttm->num_pages); 120 121 for (i = 0; i < ttm->num_pages; ++i) { 122 cur_page = ttm->pages[i]; 123 if (likely(cur_page != NULL)) { 124 ret = ttm_tt_set_page_caching(cur_page, 125 ttm->caching_state, 126 c_state); 127 if (unlikely(ret != 0)) 128 goto out_err; 129 } 130 } 131 132 ttm->caching_state = c_state; 133 134 return 0; 135 136 out_err: 137 for (j = 0; j < i; ++j) { 138 cur_page = ttm->pages[j]; 139 if (cur_page != NULL) { 140 (void)ttm_tt_set_page_caching(cur_page, c_state, 141 ttm->caching_state); 142 } 143 } 144 145 return ret; 146 } 147 148 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) 149 { 150 enum ttm_caching_state state; 151 152 if (placement & TTM_PL_FLAG_WC) 153 state = tt_wc; 154 else if (placement & TTM_PL_FLAG_UNCACHED) 155 state = tt_uncached; 156 else 157 state = tt_cached; 158 159 return ttm_tt_set_caching(ttm, state); 160 } 161 162 void ttm_tt_destroy(struct ttm_tt *ttm) 163 { 164 if (unlikely(ttm == NULL)) 165 return; 166 167 if (ttm->state == tt_bound) { 168 ttm_tt_unbind(ttm); 169 } 170 171 if (likely(ttm->pages != NULL)) { 172 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 173 } 174 175 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && 176 ttm->swap_storage) 177 vm_object_deallocate(ttm->swap_storage); 178 179 ttm->swap_storage = NULL; 180 ttm->func->destroy(ttm); 181 } 182 183 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, 184 unsigned long size, uint32_t page_flags, 185 vm_page_t dummy_read_page) 186 { 187 ttm->bdev = bdev; 188 ttm->glob = bdev->glob; 189 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 190 ttm->caching_state = tt_cached; 191 ttm->page_flags = page_flags; 192 ttm->dummy_read_page = dummy_read_page; 193 ttm->state = tt_unpopulated; 194 ttm->swap_storage = NULL; 195 196 ttm_tt_alloc_page_directory(ttm); 197 if (!ttm->pages) { 198 ttm_tt_destroy(ttm); 199 printf("Failed allocating page table\n"); 200 return -ENOMEM; 201 } 202 return 0; 203 } 204 205 void ttm_tt_fini(struct ttm_tt *ttm) 206 { 207 free(ttm->pages, M_TTM_PD); 208 ttm->pages = NULL; 209 } 210 211 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, 212 unsigned long size, uint32_t page_flags, 213 vm_page_t dummy_read_page) 214 { 215 struct ttm_tt *ttm = &ttm_dma->ttm; 216 217 ttm->bdev = bdev; 218 ttm->glob = bdev->glob; 219 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 220 ttm->caching_state = tt_cached; 221 ttm->page_flags = page_flags; 222 ttm->dummy_read_page = dummy_read_page; 223 ttm->state = tt_unpopulated; 224 ttm->swap_storage = NULL; 225 226 INIT_LIST_HEAD(&ttm_dma->pages_list); 227 ttm_dma_tt_alloc_page_directory(ttm_dma); 228 if (!ttm->pages || !ttm_dma->dma_address) { 229 ttm_tt_destroy(ttm); 230 printf("Failed allocating page table\n"); 231 return -ENOMEM; 232 } 233 return 0; 234 } 235 236 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) 237 { 238 struct ttm_tt *ttm = &ttm_dma->ttm; 239 240 free(ttm->pages, M_TTM_PD); 241 ttm->pages = NULL; 242 free(ttm_dma->dma_address, M_TTM_PD); 243 ttm_dma->dma_address = NULL; 244 } 245 246 void ttm_tt_unbind(struct ttm_tt *ttm) 247 { 248 int ret; 249 250 if (ttm->state == tt_bound) { 251 ret = ttm->func->unbind(ttm); 252 MPASS(ret == 0); 253 ttm->state = tt_unbound; 254 } 255 } 256 257 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 258 { 259 int ret = 0; 260 261 if (!ttm) 262 return -EINVAL; 263 264 if (ttm->state == tt_bound) 265 return 0; 266 267 ret = ttm->bdev->driver->ttm_tt_populate(ttm); 268 if (ret) 269 return ret; 270 271 ret = ttm->func->bind(ttm, bo_mem); 272 if (unlikely(ret != 0)) 273 return ret; 274 275 ttm->state = tt_bound; 276 277 return 0; 278 } 279 280 int ttm_tt_swapin(struct ttm_tt *ttm) 281 { 282 vm_object_t obj; 283 vm_page_t from_page, to_page; 284 int i, ret, rv; 285 286 obj = ttm->swap_storage; 287 288 VM_OBJECT_WLOCK(obj); 289 vm_object_pip_add(obj, 1); 290 for (i = 0; i < ttm->num_pages; ++i) { 291 from_page = vm_page_grab(obj, i, VM_ALLOC_NORMAL); 292 if (from_page->valid != VM_PAGE_BITS_ALL) { 293 if (vm_pager_has_page(obj, i, NULL, NULL)) { 294 rv = vm_pager_get_pages(obj, &from_page, 1, 0); 295 if (rv != VM_PAGER_OK) { 296 vm_page_lock(from_page); 297 vm_page_free(from_page); 298 vm_page_unlock(from_page); 299 ret = -EIO; 300 goto err_ret; 301 } 302 } else 303 vm_page_zero_invalid(from_page, TRUE); 304 } 305 vm_page_xunbusy(from_page); 306 to_page = ttm->pages[i]; 307 if (unlikely(to_page == NULL)) { 308 ret = -ENOMEM; 309 goto err_ret; 310 } 311 pmap_copy_page(from_page, to_page); 312 } 313 vm_object_pip_wakeup(obj); 314 VM_OBJECT_WUNLOCK(obj); 315 316 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) 317 vm_object_deallocate(obj); 318 ttm->swap_storage = NULL; 319 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 320 return (0); 321 322 err_ret: 323 vm_object_pip_wakeup(obj); 324 VM_OBJECT_WUNLOCK(obj); 325 return (ret); 326 } 327 328 int ttm_tt_swapout(struct ttm_tt *ttm, vm_object_t persistent_swap_storage) 329 { 330 vm_object_t obj; 331 vm_page_t from_page, to_page; 332 int i; 333 334 MPASS(ttm->state == tt_unbound || ttm->state == tt_unpopulated); 335 MPASS(ttm->caching_state == tt_cached); 336 337 if (persistent_swap_storage == NULL) { 338 obj = vm_pager_allocate(OBJT_SWAP, NULL, 339 IDX_TO_OFF(ttm->num_pages), VM_PROT_DEFAULT, 0, 340 curthread->td_ucred); 341 if (obj == NULL) { 342 printf("[TTM] Failed allocating swap storage\n"); 343 return (-ENOMEM); 344 } 345 } else 346 obj = persistent_swap_storage; 347 348 VM_OBJECT_WLOCK(obj); 349 vm_object_pip_add(obj, 1); 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 = vm_page_grab(obj, i, VM_ALLOC_NORMAL); 355 pmap_copy_page(from_page, to_page); 356 to_page->valid = VM_PAGE_BITS_ALL; 357 vm_page_dirty(to_page); 358 vm_page_xunbusy(to_page); 359 } 360 vm_object_pip_wakeup(obj); 361 VM_OBJECT_WUNLOCK(obj); 362 363 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 364 ttm->swap_storage = obj; 365 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; 366 if (persistent_swap_storage != NULL) 367 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP; 368 return (0); 369 } 370