drivers/gpu/drm/ttm/ttm_tt.c

   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 #include <drm/ttm/ttm_page_alloc.h>
  41 #include <drm/ttm/ttm_set_memory.h>
  42
  43 /**
  44  * Allocates a ttm structure for the given BO.
  45  */
  46 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
  47 {
  48         struct ttm_bo_device *bdev = bo->bdev;
  49         uint32_t page_flags = 0;
  50
  51         dma_resv_assert_held(bo->base.resv);
  52
  53         if (bdev->need_dma32)
  54                 page_flags |= TTM_PAGE_FLAG_DMA32;
  55
  56         if (bdev->no_retry)
  57                 page_flags |= TTM_PAGE_FLAG_NO_RETRY;
  58
  59         switch (bo->type) {
  60         case ttm_bo_type_device:
  61                 if (zero_alloc)
  62                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
  63                 break;
  64         case ttm_bo_type_kernel:
  65                 break;
  66         case ttm_bo_type_sg:
  67                 page_flags |= TTM_PAGE_FLAG_SG;
  68                 break;
  69         default:
  70                 bo->ttm = NULL;
  71                 pr_err("Illegal buffer object type\n");
  72                 return -EINVAL;
  73         }
  74
  75         bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);
  76         if (unlikely(bo->ttm == NULL))
  77                 return -ENOMEM;
  78
  79         return 0;
  80 }
  81
  82 /**
  83  * Allocates storage for pointers to the pages that back the ttm.
  84  */
  85 static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
  86 {
  87         ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
  88                         GFP_KERNEL | __GFP_ZERO);
  89         if (!ttm->pages)
  90                 return -ENOMEM;
  91         return 0;
  92 }
  93
  94 static int ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
  95 {
  96         ttm->ttm.pages = kvmalloc_array(ttm->ttm.num_pages,
  97                                           sizeof(*ttm->ttm.pages) +
  98                                           sizeof(*ttm->dma_address),
  99                                           GFP_KERNEL | __GFP_ZERO);
 100         if (!ttm->ttm.pages)
 101                 return -ENOMEM;
 102         ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
 103         return 0;
 104 }
 105
 106 static int ttm_sg_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
 107 {
 108         ttm->dma_address = kvmalloc_array(ttm->ttm.num_pages,
 109                                           sizeof(*ttm->dma_address),
 110                                           GFP_KERNEL | __GFP_ZERO);
 111         if (!ttm->dma_address)
 112                 return -ENOMEM;
 113         return 0;
 114 }
 115
 116 static int ttm_tt_set_page_caching(struct page *p,
 117                                    enum ttm_caching_state c_old,
 118                                    enum ttm_caching_state c_new)
 119 {
 120         int ret = 0;
 121
 122         if (PageHighMem(p))
 123                 return 0;
 124
 125         if (c_old != tt_cached) {
 126                 /* p isn't in the default caching state, set it to
 127                  * writeback first to free its current memtype. */
 128
 129                 ret = ttm_set_pages_wb(p, 1);
 130                 if (ret)
 131                         return ret;
 132         }
 133
 134         if (c_new == tt_wc)
 135                 ret = ttm_set_pages_wc(p, 1);
 136         else if (c_new == tt_uncached)
 137                 ret = ttm_set_pages_uc(p, 1);
 138
 139         return ret;
 140 }
 141
 142 /*
 143  * Change caching policy for the linear kernel map
 144  * for range of pages in a ttm.
 145  */
 146
 147 static int ttm_tt_set_caching(struct ttm_tt *ttm,
 148                               enum ttm_caching_state c_state)
 149 {
 150         int i, j;
 151         struct page *cur_page;
 152         int ret;
 153
 154         if (ttm->caching_state == c_state)
 155                 return 0;
 156
 157         if (ttm->state == tt_unpopulated) {
 158                 /* Change caching but don't populate */
 159                 ttm->caching_state = c_state;
 160                 return 0;
 161         }
 162
 163         if (ttm->caching_state == tt_cached)
 164                 drm_clflush_pages(ttm->pages, ttm->num_pages);
 165
 166         for (i = 0; i < ttm->num_pages; ++i) {
 167                 cur_page = ttm->pages[i];
 168                 if (likely(cur_page != NULL)) {
 169                         ret = ttm_tt_set_page_caching(cur_page,
 170                                                       ttm->caching_state,
 171                                                       c_state);
 172                         if (unlikely(ret != 0))
 173                                 goto out_err;
 174                 }
 175         }
 176
 177         ttm->caching_state = c_state;
 178
 179         return 0;
 180
 181 out_err:
 182         for (j = 0; j < i; ++j) {
 183                 cur_page = ttm->pages[j];
 184                 if (likely(cur_page != NULL)) {
 185                         (void)ttm_tt_set_page_caching(cur_page, c_state,
 186                                                       ttm->caching_state);
 187                 }
 188         }
 189
 190         return ret;
 191 }
 192
 193 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
 194 {
 195         enum ttm_caching_state state;
 196
 197         if (placement & TTM_PL_FLAG_WC)
 198                 state = tt_wc;
 199         else if (placement & TTM_PL_FLAG_UNCACHED)
 200                 state = tt_uncached;
 201         else
 202                 state = tt_cached;
 203
 204         return ttm_tt_set_caching(ttm, state);
 205 }
 206 EXPORT_SYMBOL(ttm_tt_set_placement_caching);
 207
 208 void ttm_tt_destroy(struct ttm_tt *ttm)
 209 {
 210         if (ttm == NULL)
 211                 return;
 212
 213         ttm_tt_unbind(ttm);
 214
 215         if (ttm->state == tt_unbound)
 216                 ttm_tt_unpopulate(ttm);
 217
 218         if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
 219             ttm->swap_storage)
 220                 fput(ttm->swap_storage);
 221
 222         ttm->swap_storage = NULL;
 223         ttm->func->destroy(ttm);
 224 }
 225
 226 static void ttm_tt_init_fields(struct ttm_tt *ttm,
 227                                struct ttm_buffer_object *bo,
 228                                uint32_t page_flags)
 229 {
 230         ttm->bdev = bo->bdev;
 231         ttm->num_pages = bo->num_pages;
 232         ttm->caching_state = tt_cached;
 233         ttm->page_flags = page_flags;
 234         ttm->state = tt_unpopulated;
 235         ttm->swap_storage = NULL;
 236         ttm->sg = bo->sg;
 237 }
 238
 239 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
 240                 uint32_t page_flags)
 241 {
 242         ttm_tt_init_fields(ttm, bo, page_flags);
 243
 244         if (ttm_tt_alloc_page_directory(ttm)) {
 245                 ttm_tt_destroy(ttm);
 246                 pr_err("Failed allocating page table\n");
 247                 return -ENOMEM;
 248         }
 249         return 0;
 250 }
 251 EXPORT_SYMBOL(ttm_tt_init);
 252
 253 void ttm_tt_fini(struct ttm_tt *ttm)
 254 {
 255         kvfree(ttm->pages);
 256         ttm->pages = NULL;
 257 }
 258 EXPORT_SYMBOL(ttm_tt_fini);
 259
 260 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
 261                     uint32_t page_flags)
 262 {
 263         struct ttm_tt *ttm = &ttm_dma->ttm;
 264
 265         ttm_tt_init_fields(ttm, bo, page_flags);
 266
 267         INIT_LIST_HEAD(&ttm_dma->pages_list);
 268         if (ttm_dma_tt_alloc_page_directory(ttm_dma)) {
 269                 ttm_tt_destroy(ttm);
 270                 pr_err("Failed allocating page table\n");
 271                 return -ENOMEM;
 272         }
 273         return 0;
 274 }
 275 EXPORT_SYMBOL(ttm_dma_tt_init);
 276
 277 int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
 278                    uint32_t page_flags)
 279 {
 280         struct ttm_tt *ttm = &ttm_dma->ttm;
 281         int ret;
 282
 283         ttm_tt_init_fields(ttm, bo, page_flags);
 284
 285         INIT_LIST_HEAD(&ttm_dma->pages_list);
 286         if (page_flags & TTM_PAGE_FLAG_SG)
 287                 ret = ttm_sg_tt_alloc_page_directory(ttm_dma);
 288         else
 289                 ret = ttm_dma_tt_alloc_page_directory(ttm_dma);
 290         if (ret) {
 291                 ttm_tt_destroy(ttm);
 292                 pr_err("Failed allocating page table\n");
 293                 return -ENOMEM;
 294         }
 295         return 0;
 296 }
 297 EXPORT_SYMBOL(ttm_sg_tt_init);
 298
 299 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
 300 {
 301         struct ttm_tt *ttm = &ttm_dma->ttm;
 302
 303         if (ttm->pages)
 304                 kvfree(ttm->pages);
 305         else
 306                 kvfree(ttm_dma->dma_address);
 307         ttm->pages = NULL;
 308         ttm_dma->dma_address = NULL;
 309 }
 310 EXPORT_SYMBOL(ttm_dma_tt_fini);
 311
 312 void ttm_tt_unbind(struct ttm_tt *ttm)
 313 {
 314         int ret;
 315
 316         if (ttm->state == tt_bound) {
 317                 ret = ttm->func->unbind(ttm);
 318                 BUG_ON(ret);
 319                 ttm->state = tt_unbound;
 320         }
 321 }
 322
 323 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem,
 324                 struct ttm_operation_ctx *ctx)
 325 {
 326         int ret = 0;
 327
 328         if (!ttm)
 329                 return -EINVAL;
 330
 331         if (ttm->state == tt_bound)
 332                 return 0;
 333
 334         ret = ttm_tt_populate(ttm, ctx);
 335         if (ret)
 336                 return ret;
 337
 338         ret = ttm->func->bind(ttm, bo_mem);
 339         if (unlikely(ret != 0))
 340                 return ret;
 341
 342         ttm->state = tt_bound;
 343
 344         return 0;
 345 }
 346 EXPORT_SYMBOL(ttm_tt_bind);
 347
 348 int ttm_tt_swapin(struct ttm_tt *ttm)
 349 {
 350         struct address_space *swap_space;
 351         struct file *swap_storage;
 352         struct page *from_page;
 353         struct page *to_page;
 354         int i;
 355         int ret = -ENOMEM;
 356
 357         swap_storage = ttm->swap_storage;
 358         BUG_ON(swap_storage == NULL);
 359
 360         swap_space = swap_storage->f_mapping;
 361
 362         for (i = 0; i < ttm->num_pages; ++i) {
 363                 gfp_t gfp_mask = mapping_gfp_mask(swap_space);
 364
 365                 gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
 366                 from_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
 367
 368                 if (IS_ERR(from_page)) {
 369                         ret = PTR_ERR(from_page);
 370                         goto out_err;
 371                 }
 372                 to_page = ttm->pages[i];
 373                 if (unlikely(to_page == NULL))
 374                         goto out_err;
 375
 376                 copy_highpage(to_page, from_page);
 377                 put_page(from_page);
 378         }
 379
 380         if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
 381                 fput(swap_storage);
 382         ttm->swap_storage = NULL;
 383         ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
 384
 385         return 0;
 386 out_err:
 387         return ret;
 388 }
 389
 390 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
 391 {
 392         struct address_space *swap_space;
 393         struct file *swap_storage;
 394         struct page *from_page;
 395         struct page *to_page;
 396         int i;
 397         int ret = -ENOMEM;
 398
 399         BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
 400         BUG_ON(ttm->caching_state != tt_cached);
 401
 402         if (!persistent_swap_storage) {
 403                 swap_storage = shmem_file_setup("ttm swap",
 404                                                 ttm->num_pages << PAGE_SHIFT,
 405                                                 0);
 406                 if (IS_ERR(swap_storage)) {
 407                         pr_err("Failed allocating swap storage\n");
 408                         return PTR_ERR(swap_storage);
 409                 }
 410         } else {
 411                 swap_storage = persistent_swap_storage;
 412         }
 413
 414         swap_space = swap_storage->f_mapping;
 415
 416         for (i = 0; i < ttm->num_pages; ++i) {
 417                 gfp_t gfp_mask = mapping_gfp_mask(swap_space);
 418
 419                 gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0);
 420
 421                 from_page = ttm->pages[i];
 422                 if (unlikely(from_page == NULL))
 423                         continue;
 424
 425                 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
 426                 if (IS_ERR(to_page)) {
 427                         ret = PTR_ERR(to_page);
 428                         goto out_err;
 429                 }
 430                 copy_highpage(to_page, from_page);
 431                 set_page_dirty(to_page);
 432                 mark_page_accessed(to_page);
 433                 put_page(to_page);
 434         }
 435
 436         ttm_tt_unpopulate(ttm);
 437         ttm->swap_storage = swap_storage;
 438         ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
 439         if (persistent_swap_storage)
 440                 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
 441
 442         return 0;
 443 out_err:
 444         if (!persistent_swap_storage)
 445                 fput(swap_storage);
 446
 447         return ret;
 448 }
 449
 450 static void ttm_tt_add_mapping(struct ttm_tt *ttm)
 451 {
 452         pgoff_t i;
 453
 454         if (ttm->page_flags & TTM_PAGE_FLAG_SG)
 455                 return;
 456
 457         for (i = 0; i < ttm->num_pages; ++i)
 458                 ttm->pages[i]->mapping = ttm->bdev->dev_mapping;
 459 }
 460
 461 int ttm_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 462 {
 463         int ret;
 464
 465         if (ttm->state != tt_unpopulated)
 466                 return 0;
 467
 468         if (ttm->bdev->driver->ttm_tt_populate)
 469                 ret = ttm->bdev->driver->ttm_tt_populate(ttm, ctx);
 470         else
 471                 ret = ttm_pool_populate(ttm, ctx);
 472         if (!ret)
 473                 ttm_tt_add_mapping(ttm);
 474         return ret;
 475 }
 476
 477 static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
 478 {
 479         pgoff_t i;
 480         struct page **page = ttm->pages;
 481
 482         if (ttm->page_flags & TTM_PAGE_FLAG_SG)
 483                 return;
 484
 485         for (i = 0; i < ttm->num_pages; ++i) {
 486                 (*page)->mapping = NULL;
 487                 (*page++)->index = 0;
 488         }
 489 }
 490
 491 void ttm_tt_unpopulate(struct ttm_tt *ttm)
 492 {
 493         if (ttm->state == tt_unpopulated)
 494                 return;
 495
 496         ttm_tt_clear_mapping(ttm);
 497         if (ttm->bdev->driver->ttm_tt_unpopulate)
 498                 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
 499         else
 500                 ttm_pool_unpopulate(ttm);
 501 }