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 #include <dev/drm2/drmP.h> 40 #include <dev/drm2/ttm/ttm_module.h> 41 #include <dev/drm2/ttm/ttm_bo_driver.h> 42 #include <dev/drm2/ttm/ttm_placement.h> 43 #include <dev/drm2/ttm/ttm_page_alloc.h> 44 45 MALLOC_DEFINE(M_TTM_PD, "ttm_pd", "TTM Page Directories"); 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 = malloc(ttm->num_pages * sizeof(void *), 53 M_TTM_PD, M_WAITOK | M_ZERO); 54 } 55 56 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) 57 { 58 ttm->ttm.pages = malloc(ttm->ttm.num_pages * sizeof(void *), 59 M_TTM_PD, M_WAITOK | M_ZERO); 60 ttm->dma_address = malloc(ttm->ttm.num_pages * 61 sizeof(*ttm->dma_address), M_TTM_PD, M_WAITOK); 62 } 63 64 #if defined(__i386__) || defined(__amd64__) 65 static inline int ttm_tt_set_page_caching(vm_page_t p, 66 enum ttm_caching_state c_old, 67 enum ttm_caching_state c_new) 68 { 69 70 /* XXXKIB our VM does not need this. */ 71 #if 0 72 if (c_old != tt_cached) { 73 /* p isn't in the default caching state, set it to 74 * writeback first to free its current memtype. */ 75 pmap_page_set_memattr(p, VM_MEMATTR_WRITE_BACK); 76 } 77 #endif 78 79 if (c_new == tt_wc) 80 pmap_page_set_memattr(p, VM_MEMATTR_WRITE_COMBINING); 81 else if (c_new == tt_uncached) 82 pmap_page_set_memattr(p, VM_MEMATTR_UNCACHEABLE); 83 84 return (0); 85 } 86 #else 87 static inline int ttm_tt_set_page_caching(vm_page_t p, 88 enum ttm_caching_state c_old, 89 enum ttm_caching_state c_new) 90 { 91 return 0; 92 } 93 #endif 94 95 /* 96 * Change caching policy for the linear kernel map 97 * for range of pages in a ttm. 98 */ 99 100 static int ttm_tt_set_caching(struct ttm_tt *ttm, 101 enum ttm_caching_state c_state) 102 { 103 int i, j; 104 vm_page_t cur_page; 105 int ret; 106 107 if (ttm->caching_state == c_state) 108 return 0; 109 110 if (ttm->state == tt_unpopulated) { 111 /* Change caching but don't populate */ 112 ttm->caching_state = c_state; 113 return 0; 114 } 115 116 if (ttm->caching_state == tt_cached) 117 drm_clflush_pages(ttm->pages, ttm->num_pages); 118 119 for (i = 0; i < ttm->num_pages; ++i) { 120 cur_page = ttm->pages[i]; 121 if (likely(cur_page != NULL)) { 122 ret = ttm_tt_set_page_caching(cur_page, 123 ttm->caching_state, 124 c_state); 125 if (unlikely(ret != 0)) 126 goto out_err; 127 } 128 } 129 130 ttm->caching_state = c_state; 131 132 return 0; 133 134 out_err: 135 for (j = 0; j < i; ++j) { 136 cur_page = ttm->pages[j]; 137 if (cur_page != NULL) { 138 (void)ttm_tt_set_page_caching(cur_page, c_state, 139 ttm->caching_state); 140 } 141 } 142 143 return ret; 144 } 145 146 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) 147 { 148 enum ttm_caching_state state; 149 150 if (placement & TTM_PL_FLAG_WC) 151 state = tt_wc; 152 else if (placement & TTM_PL_FLAG_UNCACHED) 153 state = tt_uncached; 154 else 155 state = tt_cached; 156 157 return ttm_tt_set_caching(ttm, state); 158 } 159 160 void ttm_tt_destroy(struct ttm_tt *ttm) 161 { 162 if (unlikely(ttm == NULL)) 163 return; 164 165 if (ttm->state == tt_bound) { 166 ttm_tt_unbind(ttm); 167 } 168 169 if (likely(ttm->pages != NULL)) { 170 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 171 } 172 173 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) && 174 ttm->swap_storage) 175 vm_object_deallocate(ttm->swap_storage); 176 177 ttm->swap_storage = NULL; 178 ttm->func->destroy(ttm); 179 } 180 181 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, 182 unsigned long size, uint32_t page_flags, 183 vm_page_t dummy_read_page) 184 { 185 ttm->bdev = bdev; 186 ttm->glob = bdev->glob; 187 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 188 ttm->caching_state = tt_cached; 189 ttm->page_flags = page_flags; 190 ttm->dummy_read_page = dummy_read_page; 191 ttm->state = tt_unpopulated; 192 ttm->swap_storage = NULL; 193 194 ttm_tt_alloc_page_directory(ttm); 195 if (!ttm->pages) { 196 ttm_tt_destroy(ttm); 197 printf("Failed allocating page table\n"); 198 return -ENOMEM; 199 } 200 return 0; 201 } 202 203 void ttm_tt_fini(struct ttm_tt *ttm) 204 { 205 free(ttm->pages, M_TTM_PD); 206 ttm->pages = NULL; 207 } 208 209 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, 210 unsigned long size, uint32_t page_flags, 211 vm_page_t dummy_read_page) 212 { 213 struct ttm_tt *ttm = &ttm_dma->ttm; 214 215 ttm->bdev = bdev; 216 ttm->glob = bdev->glob; 217 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 218 ttm->caching_state = tt_cached; 219 ttm->page_flags = page_flags; 220 ttm->dummy_read_page = dummy_read_page; 221 ttm->state = tt_unpopulated; 222 ttm->swap_storage = NULL; 223 224 INIT_LIST_HEAD(&ttm_dma->pages_list); 225 ttm_dma_tt_alloc_page_directory(ttm_dma); 226 if (!ttm->pages || !ttm_dma->dma_address) { 227 ttm_tt_destroy(ttm); 228 printf("Failed allocating page table\n"); 229 return -ENOMEM; 230 } 231 return 0; 232 } 233 234 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) 235 { 236 struct ttm_tt *ttm = &ttm_dma->ttm; 237 238 free(ttm->pages, M_TTM_PD); 239 ttm->pages = NULL; 240 free(ttm_dma->dma_address, M_TTM_PD); 241 ttm_dma->dma_address = NULL; 242 } 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 MPASS(ret == 0); 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 } 277 278 int ttm_tt_swapin(struct ttm_tt *ttm) 279 { 280 vm_object_t obj; 281 vm_page_t from_page, to_page; 282 int i, ret, rv; 283 284 obj = ttm->swap_storage; 285 286 vm_object_pip_add(obj, 1); 287 for (i = 0; i < ttm->num_pages; ++i) { 288 rv = vm_page_grab_valid_unlocked(&from_page, obj, i, 289 VM_ALLOC_NORMAL | VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY); 290 if (rv != VM_PAGER_OK) { 291 ret = -EIO; 292 goto err_ret; 293 } 294 to_page = ttm->pages[i]; 295 if (unlikely(to_page == NULL)) { 296 vm_page_sunbusy(from_page); 297 ret = -ENOMEM; 298 goto err_ret; 299 } 300 pmap_copy_page(from_page, to_page); 301 vm_page_sunbusy(from_page); 302 } 303 vm_object_pip_wakeup(obj); 304 305 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP)) 306 vm_object_deallocate(obj); 307 ttm->swap_storage = NULL; 308 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 309 return (0); 310 311 err_ret: 312 vm_object_pip_wakeup(obj); 313 return (ret); 314 } 315 316 int ttm_tt_swapout(struct ttm_tt *ttm, vm_object_t persistent_swap_storage) 317 { 318 vm_object_t obj; 319 vm_page_t from_page, to_page; 320 int i; 321 322 MPASS(ttm->state == tt_unbound || ttm->state == tt_unpopulated); 323 MPASS(ttm->caching_state == tt_cached); 324 325 if (persistent_swap_storage == NULL) { 326 obj = vm_pager_allocate(OBJT_SWAP, NULL, 327 IDX_TO_OFF(ttm->num_pages), VM_PROT_DEFAULT, 0, 328 curthread->td_ucred); 329 if (obj == NULL) { 330 printf("[TTM] Failed allocating swap storage\n"); 331 return (-ENOMEM); 332 } 333 } else 334 obj = persistent_swap_storage; 335 336 VM_OBJECT_WLOCK(obj); 337 vm_object_pip_add(obj, 1); 338 for (i = 0; i < ttm->num_pages; ++i) { 339 from_page = ttm->pages[i]; 340 if (unlikely(from_page == NULL)) 341 continue; 342 to_page = vm_page_grab(obj, i, VM_ALLOC_NORMAL); 343 pmap_copy_page(from_page, to_page); 344 vm_page_valid(to_page); 345 vm_page_dirty(to_page); 346 vm_page_xunbusy(to_page); 347 } 348 vm_object_pip_wakeup(obj); 349 VM_OBJECT_WUNLOCK(obj); 350 351 ttm->bdev->driver->ttm_tt_unpopulate(ttm); 352 ttm->swap_storage = obj; 353 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; 354 if (persistent_swap_storage != NULL) 355 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP; 356 return (0); 357 } 358