1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2 /************************************************************************** 3 * 4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial portions 17 * of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 25 * USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 **************************************************************************/ 28 /* 29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 30 */ 31 32 #define pr_fmt(fmt) "[TTM] " fmt 33 34 #include <linux/sched.h> 35 #include <linux/pagemap.h> 36 #include <linux/shmem_fs.h> 37 #include <linux/file.h> 38 #include <drm/drm_cache.h> 39 #include <drm/ttm/ttm_bo_driver.h> 40 41 /* 42 * Allocates a ttm structure for the given BO. 43 */ 44 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc) 45 { 46 struct ttm_bo_device *bdev = bo->bdev; 47 uint32_t page_flags = 0; 48 49 dma_resv_assert_held(bo->base.resv); 50 51 if (bo->ttm) 52 return 0; 53 54 switch (bo->type) { 55 case ttm_bo_type_device: 56 if (zero_alloc) 57 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC; 58 break; 59 case ttm_bo_type_kernel: 60 break; 61 case ttm_bo_type_sg: 62 page_flags |= TTM_PAGE_FLAG_SG; 63 break; 64 default: 65 pr_err("Illegal buffer object type\n"); 66 return -EINVAL; 67 } 68 69 bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags); 70 if (unlikely(bo->ttm == NULL)) 71 return -ENOMEM; 72 73 return 0; 74 } 75 76 /* 77 * Allocates storage for pointers to the pages that back the ttm. 78 */ 79 static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm) 80 { 81 ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*), 82 GFP_KERNEL | __GFP_ZERO); 83 if (!ttm->pages) 84 return -ENOMEM; 85 return 0; 86 } 87 88 static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm) 89 { 90 ttm->pages = kvmalloc_array(ttm->num_pages, 91 sizeof(*ttm->pages) + 92 sizeof(*ttm->dma_address), 93 GFP_KERNEL | __GFP_ZERO); 94 if (!ttm->pages) 95 return -ENOMEM; 96 97 ttm->dma_address = (void *)(ttm->pages + ttm->num_pages); 98 return 0; 99 } 100 101 static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm) 102 { 103 ttm->dma_address = kvmalloc_array(ttm->num_pages, 104 sizeof(*ttm->dma_address), 105 GFP_KERNEL | __GFP_ZERO); 106 if (!ttm->dma_address) 107 return -ENOMEM; 108 return 0; 109 } 110 111 void ttm_tt_destroy_common(struct ttm_bo_device *bdev, struct ttm_tt *ttm) 112 { 113 ttm_tt_unpopulate(bdev, ttm); 114 115 if (ttm->swap_storage) 116 fput(ttm->swap_storage); 117 118 ttm->swap_storage = NULL; 119 } 120 EXPORT_SYMBOL(ttm_tt_destroy_common); 121 122 void ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm) 123 { 124 bdev->driver->ttm_tt_destroy(bdev, ttm); 125 } 126 127 static void ttm_tt_init_fields(struct ttm_tt *ttm, 128 struct ttm_buffer_object *bo, 129 uint32_t page_flags, 130 enum ttm_caching caching) 131 { 132 ttm->num_pages = bo->num_pages; 133 ttm->caching = ttm_cached; 134 ttm->page_flags = page_flags; 135 ttm->dma_address = NULL; 136 ttm->swap_storage = NULL; 137 ttm->sg = bo->sg; 138 ttm->caching = caching; 139 } 140 141 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo, 142 uint32_t page_flags, enum ttm_caching caching) 143 { 144 ttm_tt_init_fields(ttm, bo, page_flags, caching); 145 146 if (ttm_tt_alloc_page_directory(ttm)) { 147 pr_err("Failed allocating page table\n"); 148 return -ENOMEM; 149 } 150 return 0; 151 } 152 EXPORT_SYMBOL(ttm_tt_init); 153 154 void ttm_tt_fini(struct ttm_tt *ttm) 155 { 156 if (ttm->pages) 157 kvfree(ttm->pages); 158 else 159 kvfree(ttm->dma_address); 160 ttm->pages = NULL; 161 ttm->dma_address = NULL; 162 } 163 EXPORT_SYMBOL(ttm_tt_fini); 164 165 int ttm_dma_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo, 166 uint32_t page_flags, enum ttm_caching caching) 167 { 168 ttm_tt_init_fields(ttm, bo, page_flags, caching); 169 170 if (ttm_dma_tt_alloc_page_directory(ttm)) { 171 pr_err("Failed allocating page table\n"); 172 return -ENOMEM; 173 } 174 return 0; 175 } 176 EXPORT_SYMBOL(ttm_dma_tt_init); 177 178 int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo, 179 uint32_t page_flags, enum ttm_caching caching) 180 { 181 int ret; 182 183 ttm_tt_init_fields(ttm, bo, page_flags, caching); 184 185 if (page_flags & TTM_PAGE_FLAG_SG) 186 ret = ttm_sg_tt_alloc_page_directory(ttm); 187 else 188 ret = ttm_dma_tt_alloc_page_directory(ttm); 189 if (ret) { 190 pr_err("Failed allocating page table\n"); 191 return -ENOMEM; 192 } 193 return 0; 194 } 195 EXPORT_SYMBOL(ttm_sg_tt_init); 196 197 int ttm_tt_swapin(struct ttm_tt *ttm) 198 { 199 struct address_space *swap_space; 200 struct file *swap_storage; 201 struct page *from_page; 202 struct page *to_page; 203 gfp_t gfp_mask; 204 int i, ret; 205 206 swap_storage = ttm->swap_storage; 207 BUG_ON(swap_storage == NULL); 208 209 swap_space = swap_storage->f_mapping; 210 gfp_mask = mapping_gfp_mask(swap_space); 211 212 for (i = 0; i < ttm->num_pages; ++i) { 213 from_page = shmem_read_mapping_page_gfp(swap_space, i, 214 gfp_mask); 215 if (IS_ERR(from_page)) { 216 ret = PTR_ERR(from_page); 217 goto out_err; 218 } 219 to_page = ttm->pages[i]; 220 if (unlikely(to_page == NULL)) { 221 ret = -ENOMEM; 222 goto out_err; 223 } 224 225 copy_highpage(to_page, from_page); 226 put_page(from_page); 227 } 228 229 fput(swap_storage); 230 ttm->swap_storage = NULL; 231 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 232 233 return 0; 234 235 out_err: 236 return ret; 237 } 238 239 int ttm_tt_swapout(struct ttm_bo_device *bdev, struct ttm_tt *ttm) 240 { 241 struct address_space *swap_space; 242 struct file *swap_storage; 243 struct page *from_page; 244 struct page *to_page; 245 gfp_t gfp_mask; 246 int i, ret; 247 248 swap_storage = shmem_file_setup("ttm swap", 249 ttm->num_pages << PAGE_SHIFT, 250 0); 251 if (IS_ERR(swap_storage)) { 252 pr_err("Failed allocating swap storage\n"); 253 return PTR_ERR(swap_storage); 254 } 255 256 swap_space = swap_storage->f_mapping; 257 gfp_mask = mapping_gfp_mask(swap_space); 258 259 for (i = 0; i < ttm->num_pages; ++i) { 260 from_page = ttm->pages[i]; 261 if (unlikely(from_page == NULL)) 262 continue; 263 264 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask); 265 if (IS_ERR(to_page)) { 266 ret = PTR_ERR(to_page); 267 goto out_err; 268 } 269 copy_highpage(to_page, from_page); 270 set_page_dirty(to_page); 271 mark_page_accessed(to_page); 272 put_page(to_page); 273 } 274 275 ttm_tt_unpopulate(bdev, ttm); 276 ttm->swap_storage = swap_storage; 277 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; 278 279 return 0; 280 281 out_err: 282 fput(swap_storage); 283 284 return ret; 285 } 286 287 static void ttm_tt_add_mapping(struct ttm_bo_device *bdev, struct ttm_tt *ttm) 288 { 289 pgoff_t i; 290 291 if (ttm->page_flags & TTM_PAGE_FLAG_SG) 292 return; 293 294 for (i = 0; i < ttm->num_pages; ++i) 295 ttm->pages[i]->mapping = bdev->dev_mapping; 296 } 297 298 int ttm_tt_populate(struct ttm_bo_device *bdev, 299 struct ttm_tt *ttm, struct ttm_operation_ctx *ctx) 300 { 301 int ret; 302 303 if (!ttm) 304 return -EINVAL; 305 306 if (ttm_tt_is_populated(ttm)) 307 return 0; 308 309 if (bdev->driver->ttm_tt_populate) 310 ret = bdev->driver->ttm_tt_populate(bdev, ttm, ctx); 311 else 312 ret = ttm_pool_alloc(&bdev->pool, ttm, ctx); 313 if (ret) 314 return ret; 315 316 ttm_tt_add_mapping(bdev, ttm); 317 ttm->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED; 318 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { 319 ret = ttm_tt_swapin(ttm); 320 if (unlikely(ret != 0)) { 321 ttm_tt_unpopulate(bdev, ttm); 322 return ret; 323 } 324 } 325 326 return 0; 327 } 328 EXPORT_SYMBOL(ttm_tt_populate); 329 330 static void ttm_tt_clear_mapping(struct ttm_tt *ttm) 331 { 332 pgoff_t i; 333 struct page **page = ttm->pages; 334 335 if (ttm->page_flags & TTM_PAGE_FLAG_SG) 336 return; 337 338 for (i = 0; i < ttm->num_pages; ++i) { 339 (*page)->mapping = NULL; 340 (*page++)->index = 0; 341 } 342 } 343 344 void ttm_tt_unpopulate(struct ttm_bo_device *bdev, 345 struct ttm_tt *ttm) 346 { 347 if (!ttm_tt_is_populated(ttm)) 348 return; 349 350 ttm_tt_clear_mapping(ttm); 351 if (bdev->driver->ttm_tt_unpopulate) 352 bdev->driver->ttm_tt_unpopulate(bdev, ttm); 353 else 354 ttm_pool_free(&bdev->pool, ttm); 355 ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED; 356 } 357