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 = PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT; 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_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo, 166 uint32_t page_flags, enum ttm_caching caching) 167 { 168 int ret; 169 170 ttm_tt_init_fields(ttm, bo, page_flags, caching); 171 172 if (page_flags & TTM_PAGE_FLAG_SG) 173 ret = ttm_sg_tt_alloc_page_directory(ttm); 174 else 175 ret = ttm_dma_tt_alloc_page_directory(ttm); 176 if (ret) { 177 pr_err("Failed allocating page table\n"); 178 return -ENOMEM; 179 } 180 return 0; 181 } 182 EXPORT_SYMBOL(ttm_sg_tt_init); 183 184 int ttm_tt_swapin(struct ttm_tt *ttm) 185 { 186 struct address_space *swap_space; 187 struct file *swap_storage; 188 struct page *from_page; 189 struct page *to_page; 190 gfp_t gfp_mask; 191 int i, ret; 192 193 swap_storage = ttm->swap_storage; 194 BUG_ON(swap_storage == NULL); 195 196 swap_space = swap_storage->f_mapping; 197 gfp_mask = mapping_gfp_mask(swap_space); 198 199 for (i = 0; i < ttm->num_pages; ++i) { 200 from_page = shmem_read_mapping_page_gfp(swap_space, i, 201 gfp_mask); 202 if (IS_ERR(from_page)) { 203 ret = PTR_ERR(from_page); 204 goto out_err; 205 } 206 to_page = ttm->pages[i]; 207 if (unlikely(to_page == NULL)) { 208 ret = -ENOMEM; 209 goto out_err; 210 } 211 212 copy_highpage(to_page, from_page); 213 put_page(from_page); 214 } 215 216 fput(swap_storage); 217 ttm->swap_storage = NULL; 218 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; 219 220 return 0; 221 222 out_err: 223 return ret; 224 } 225 226 int ttm_tt_swapout(struct ttm_bo_device *bdev, struct ttm_tt *ttm) 227 { 228 struct address_space *swap_space; 229 struct file *swap_storage; 230 struct page *from_page; 231 struct page *to_page; 232 gfp_t gfp_mask; 233 int i, ret; 234 235 swap_storage = shmem_file_setup("ttm swap", 236 ttm->num_pages << PAGE_SHIFT, 237 0); 238 if (IS_ERR(swap_storage)) { 239 pr_err("Failed allocating swap storage\n"); 240 return PTR_ERR(swap_storage); 241 } 242 243 swap_space = swap_storage->f_mapping; 244 gfp_mask = mapping_gfp_mask(swap_space); 245 246 for (i = 0; i < ttm->num_pages; ++i) { 247 from_page = ttm->pages[i]; 248 if (unlikely(from_page == NULL)) 249 continue; 250 251 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask); 252 if (IS_ERR(to_page)) { 253 ret = PTR_ERR(to_page); 254 goto out_err; 255 } 256 copy_highpage(to_page, from_page); 257 set_page_dirty(to_page); 258 mark_page_accessed(to_page); 259 put_page(to_page); 260 } 261 262 ttm_tt_unpopulate(bdev, ttm); 263 ttm->swap_storage = swap_storage; 264 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; 265 266 return 0; 267 268 out_err: 269 fput(swap_storage); 270 271 return ret; 272 } 273 274 static void ttm_tt_add_mapping(struct ttm_bo_device *bdev, struct ttm_tt *ttm) 275 { 276 pgoff_t i; 277 278 if (ttm->page_flags & TTM_PAGE_FLAG_SG) 279 return; 280 281 for (i = 0; i < ttm->num_pages; ++i) 282 ttm->pages[i]->mapping = bdev->dev_mapping; 283 } 284 285 int ttm_tt_populate(struct ttm_bo_device *bdev, 286 struct ttm_tt *ttm, struct ttm_operation_ctx *ctx) 287 { 288 int ret; 289 290 if (!ttm) 291 return -EINVAL; 292 293 if (ttm_tt_is_populated(ttm)) 294 return 0; 295 296 if (bdev->driver->ttm_tt_populate) 297 ret = bdev->driver->ttm_tt_populate(bdev, ttm, ctx); 298 else 299 ret = ttm_pool_alloc(&bdev->pool, ttm, ctx); 300 if (ret) 301 return ret; 302 303 ttm_tt_add_mapping(bdev, ttm); 304 ttm->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED; 305 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { 306 ret = ttm_tt_swapin(ttm); 307 if (unlikely(ret != 0)) { 308 ttm_tt_unpopulate(bdev, ttm); 309 return ret; 310 } 311 } 312 313 return 0; 314 } 315 EXPORT_SYMBOL(ttm_tt_populate); 316 317 static void ttm_tt_clear_mapping(struct ttm_tt *ttm) 318 { 319 pgoff_t i; 320 struct page **page = ttm->pages; 321 322 if (ttm->page_flags & TTM_PAGE_FLAG_SG) 323 return; 324 325 for (i = 0; i < ttm->num_pages; ++i) { 326 (*page)->mapping = NULL; 327 (*page++)->index = 0; 328 } 329 } 330 331 void ttm_tt_unpopulate(struct ttm_bo_device *bdev, 332 struct ttm_tt *ttm) 333 { 334 if (!ttm_tt_is_populated(ttm)) 335 return; 336 337 ttm_tt_clear_mapping(ttm); 338 if (bdev->driver->ttm_tt_unpopulate) 339 bdev->driver->ttm_tt_unpopulate(bdev, ttm); 340 else 341 ttm_pool_free(&bdev->pool, ttm); 342 ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED; 343 } 344