drivers/gpu/drm/ttm/ttm_tt.c

   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 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include <linux/sched.h>
  34 #include <linux/highmem.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/shmem_fs.h>
  37 #include <linux/file.h>
  38 #include <linux/swap.h>
  39 #include <linux/slab.h>
  40 #include <linux/export.h>
  41 #include <drm/drm_cache.h>
  42 #include <drm/ttm/ttm_module.h>
  43 #include <drm/ttm/ttm_bo_driver.h>
  44 #include <drm/ttm/ttm_placement.h>
  45 #include <drm/ttm/ttm_page_alloc.h>
  46 #ifdef CONFIG_X86
  47 #include <asm/set_memory.h>
  48 #endif
  49
  50 /**
  51  * Allocates storage for pointers to the pages that back the ttm.
  52  */
  53 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
  54 {
  55         ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
  56                         GFP_KERNEL | __GFP_ZERO);
  57 }
  58
  59 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
  60 {
  61         ttm->ttm.pages = kvmalloc_array(ttm->ttm.num_pages,
  62                                           sizeof(*ttm->ttm.pages) +
  63                                           sizeof(*ttm->dma_address),
  64                                           GFP_KERNEL | __GFP_ZERO);
  65         ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
  66 }
  67
  68 #ifdef CONFIG_X86
  69 static inline int ttm_tt_set_page_caching(struct page *p,
  70                                           enum ttm_caching_state c_old,
  71                                           enum ttm_caching_state c_new)
  72 {
  73         int ret = 0;
  74
  75         if (PageHighMem(p))
  76                 return 0;
  77
  78         if (c_old != tt_cached) {
  79                 /* p isn't in the default caching state, set it to
  80                  * writeback first to free its current memtype. */
  81
  82                 ret = set_pages_wb(p, 1);
  83                 if (ret)
  84                         return ret;
  85         }
  86
  87         if (c_new == tt_wc)
  88                 ret = set_memory_wc((unsigned long) page_address(p), 1);
  89         else if (c_new == tt_uncached)
  90                 ret = set_pages_uc(p, 1);
  91
  92         return ret;
  93 }
  94 #else /* CONFIG_X86 */
  95 static inline int ttm_tt_set_page_caching(struct page *p,
  96                                           enum ttm_caching_state c_old,
  97                                           enum ttm_caching_state c_new)
  98 {
  99         return 0;
 100 }
 101 #endif /* CONFIG_X86 */
 102
 103 /*
 104  * Change caching policy for the linear kernel map
 105  * for range of pages in a ttm.
 106  */
 107
 108 static int ttm_tt_set_caching(struct ttm_tt *ttm,
 109                               enum ttm_caching_state c_state)
 110 {
 111         int i, j;
 112         struct page *cur_page;
 113         int ret;
 114
 115         if (ttm->caching_state == c_state)
 116                 return 0;
 117
 118         if (ttm->state == tt_unpopulated) {
 119                 /* Change caching but don't populate */
 120                 ttm->caching_state = c_state;
 121                 return 0;
 122         }
 123
 124         if (ttm->caching_state == tt_cached)
 125                 drm_clflush_pages(ttm->pages, ttm->num_pages);
 126
 127         for (i = 0; i < ttm->num_pages; ++i) {
 128                 cur_page = ttm->pages[i];
 129                 if (likely(cur_page != NULL)) {
 130                         ret = ttm_tt_set_page_caching(cur_page,
 131                                                       ttm->caching_state,
 132                                                       c_state);
 133                         if (unlikely(ret != 0))
 134                                 goto out_err;
 135                 }
 136         }
 137
 138         ttm->caching_state = c_state;
 139
 140         return 0;
 141
 142 out_err:
 143         for (j = 0; j < i; ++j) {
 144                 cur_page = ttm->pages[j];
 145                 if (likely(cur_page != NULL)) {
 146                         (void)ttm_tt_set_page_caching(cur_page, c_state,
 147                                                       ttm->caching_state);
 148                 }
 149         }
 150
 151         return ret;
 152 }
 153
 154 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
 155 {
 156         enum ttm_caching_state state;
 157
 158         if (placement & TTM_PL_FLAG_WC)
 159                 state = tt_wc;
 160         else if (placement & TTM_PL_FLAG_UNCACHED)
 161                 state = tt_uncached;
 162         else
 163                 state = tt_cached;
 164
 165         return ttm_tt_set_caching(ttm, state);
 166 }
 167 EXPORT_SYMBOL(ttm_tt_set_placement_caching);
 168
 169 void ttm_tt_destroy(struct ttm_tt *ttm)
 170 {
 171         if (ttm == NULL)
 172                 return;
 173
 174         ttm_tt_unbind(ttm);
 175
 176         if (ttm->state == tt_unbound)
 177                 ttm_tt_unpopulate(ttm);
 178
 179         if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
 180             ttm->swap_storage)
 181                 fput(ttm->swap_storage);
 182
 183         ttm->swap_storage = NULL;
 184         ttm->func->destroy(ttm);
 185 }
 186
 187 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
 188                 unsigned long size, uint32_t page_flags,
 189                 struct page *dummy_read_page)
 190 {
 191         ttm->bdev = bdev;
 192         ttm->glob = bdev->glob;
 193         ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 194         ttm->caching_state = tt_cached;
 195         ttm->page_flags = page_flags;
 196         ttm->dummy_read_page = dummy_read_page;
 197         ttm->state = tt_unpopulated;
 198         ttm->swap_storage = NULL;
 199
 200         ttm_tt_alloc_page_directory(ttm);
 201         if (!ttm->pages) {
 202                 ttm_tt_destroy(ttm);
 203                 pr_err("Failed allocating page table\n");
 204                 return -ENOMEM;
 205         }
 206         return 0;
 207 }
 208 EXPORT_SYMBOL(ttm_tt_init);
 209
 210 void ttm_tt_fini(struct ttm_tt *ttm)
 211 {
 212         kvfree(ttm->pages);
 213         ttm->pages = NULL;
 214 }
 215 EXPORT_SYMBOL(ttm_tt_fini);
 216
 217 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
 218                 unsigned long size, uint32_t page_flags,
 219                 struct page *dummy_read_page)
 220 {
 221         struct ttm_tt *ttm = &ttm_dma->ttm;
 222
 223         ttm->bdev = bdev;
 224         ttm->glob = bdev->glob;
 225         ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 226         ttm->caching_state = tt_cached;
 227         ttm->page_flags = page_flags;
 228         ttm->dummy_read_page = dummy_read_page;
 229         ttm->state = tt_unpopulated;
 230         ttm->swap_storage = NULL;
 231
 232         INIT_LIST_HEAD(&ttm_dma->pages_list);
 233         ttm_dma_tt_alloc_page_directory(ttm_dma);
 234         if (!ttm->pages) {
 235                 ttm_tt_destroy(ttm);
 236                 pr_err("Failed allocating page table\n");
 237                 return -ENOMEM;
 238         }
 239         return 0;
 240 }
 241 EXPORT_SYMBOL(ttm_dma_tt_init);
 242
 243 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
 244 {
 245         struct ttm_tt *ttm = &ttm_dma->ttm;
 246
 247         kvfree(ttm->pages);
 248         ttm->pages = NULL;
 249         ttm_dma->dma_address = NULL;
 250 }
 251 EXPORT_SYMBOL(ttm_dma_tt_fini);
 252
 253 void ttm_tt_unbind(struct ttm_tt *ttm)
 254 {
 255         int ret;
 256
 257         if (ttm->state == tt_bound) {
 258                 ret = ttm->func->unbind(ttm);
 259                 BUG_ON(ret);
 260                 ttm->state = tt_unbound;
 261         }
 262 }
 263
 264 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 265 {
 266         int ret = 0;
 267
 268         if (!ttm)
 269                 return -EINVAL;
 270
 271         if (ttm->state == tt_bound)
 272                 return 0;
 273
 274         ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 275         if (ret)
 276                 return ret;
 277
 278         ret = ttm->func->bind(ttm, bo_mem);
 279         if (unlikely(ret != 0))
 280                 return ret;
 281
 282         ttm->state = tt_bound;
 283
 284         return 0;
 285 }
 286 EXPORT_SYMBOL(ttm_tt_bind);
 287
 288 int ttm_tt_swapin(struct ttm_tt *ttm)
 289 {
 290         struct address_space *swap_space;
 291         struct file *swap_storage;
 292         struct page *from_page;
 293         struct page *to_page;
 294         int i;
 295         int ret = -ENOMEM;
 296
 297         swap_storage = ttm->swap_storage;
 298         BUG_ON(swap_storage == NULL);
 299
 300         swap_space = swap_storage->f_mapping;
 301
 302         for (i = 0; i < ttm->num_pages; ++i) {
 303                 from_page = shmem_read_mapping_page(swap_space, i);
 304                 if (IS_ERR(from_page)) {
 305                         ret = PTR_ERR(from_page);
 306                         goto out_err;
 307                 }
 308                 to_page = ttm->pages[i];
 309                 if (unlikely(to_page == NULL))
 310                         goto out_err;
 311
 312                 copy_highpage(to_page, from_page);
 313                 put_page(from_page);
 314         }
 315
 316         if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
 317                 fput(swap_storage);
 318         ttm->swap_storage = NULL;
 319         ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
 320
 321         return 0;
 322 out_err:
 323         return ret;
 324 }
 325
 326 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
 327 {
 328         struct address_space *swap_space;
 329         struct file *swap_storage;
 330         struct page *from_page;
 331         struct page *to_page;
 332         int i;
 333         int ret = -ENOMEM;
 334
 335         BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
 336         BUG_ON(ttm->caching_state != tt_cached);
 337
 338         if (!persistent_swap_storage) {
 339                 swap_storage = shmem_file_setup("ttm swap",
 340                                                 ttm->num_pages << PAGE_SHIFT,
 341                                                 0);
 342                 if (IS_ERR(swap_storage)) {
 343                         pr_err("Failed allocating swap storage\n");
 344                         return PTR_ERR(swap_storage);
 345                 }
 346         } else
 347                 swap_storage = persistent_swap_storage;
 348
 349         swap_space = swap_storage->f_mapping;
 350
 351         for (i = 0; i < ttm->num_pages; ++i) {
 352                 from_page = ttm->pages[i];
 353                 if (unlikely(from_page == NULL))
 354                         continue;
 355                 to_page = shmem_read_mapping_page(swap_space, i);
 356                 if (IS_ERR(to_page)) {
 357                         ret = PTR_ERR(to_page);
 358                         goto out_err;
 359                 }
 360                 copy_highpage(to_page, from_page);
 361                 set_page_dirty(to_page);
 362                 mark_page_accessed(to_page);
 363                 put_page(to_page);
 364         }
 365
 366         ttm_tt_unpopulate(ttm);
 367         ttm->swap_storage = swap_storage;
 368         ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
 369         if (persistent_swap_storage)
 370                 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
 371
 372         return 0;
 373 out_err:
 374         if (!persistent_swap_storage)
 375                 fput(swap_storage);
 376
 377         return ret;
 378 }
 379
 380 static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
 381 {
 382         pgoff_t i;
 383         struct page **page = ttm->pages;
 384
 385         if (ttm->page_flags & TTM_PAGE_FLAG_SG)
 386                 return;
 387
 388         for (i = 0; i < ttm->num_pages; ++i) {
 389                 (*page)->mapping = NULL;
 390                 (*page++)->index = 0;
 391         }
 392 }
 393
 394 void ttm_tt_unpopulate(struct ttm_tt *ttm)
 395 {
 396         if (ttm->state == tt_unpopulated)
 397                 return;
 398
 399         ttm_tt_clear_mapping(ttm);
 400         ttm->bdev->driver->ttm_tt_unpopulate(ttm);
 401 }