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
  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 }