git.oblomov.eu Git - linux-2.6/blob - drivers/gpu/drm/ttm/ttm_bo_util.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2007-2009 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 #include "ttm/ttm_bo_driver.h"
  32 #include "ttm/ttm_placement.h"
  33 #include <linux/io.h>
  34 #include <linux/highmem.h>
  35 #include <linux/wait.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/version.h>
  38 #include <linux/module.h>
  39
  40 void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
  41 {
  42         struct ttm_mem_reg *old_mem = &bo->mem;
  43
  44         if (old_mem->mm_node) {
  45                 spin_lock(&bo->bdev->lru_lock);
  46                 drm_mm_put_block(old_mem->mm_node);
  47                 spin_unlock(&bo->bdev->lru_lock);
  48         }
  49         old_mem->mm_node = NULL;
  50 }
  51
  52 int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
  53                     bool evict, bool no_wait, struct ttm_mem_reg *new_mem)
  54 {
  55         struct ttm_tt *ttm = bo->ttm;
  56         struct ttm_mem_reg *old_mem = &bo->mem;
  57         uint32_t save_flags = old_mem->placement;
  58         int ret;
  59
  60         if (old_mem->mem_type != TTM_PL_SYSTEM) {
  61                 ttm_tt_unbind(ttm);
  62                 ttm_bo_free_old_node(bo);
  63                 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
  64                                 TTM_PL_MASK_MEM);
  65                 old_mem->mem_type = TTM_PL_SYSTEM;
  66                 save_flags = old_mem->placement;
  67         }
  68
  69         ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
  70         if (unlikely(ret != 0))
  71                 return ret;
  72
  73         if (new_mem->mem_type != TTM_PL_SYSTEM) {
  74                 ret = ttm_tt_bind(ttm, new_mem);
  75                 if (unlikely(ret != 0))
  76                         return ret;
  77         }
  78
  79         *old_mem = *new_mem;
  80         new_mem->mm_node = NULL;
  81         ttm_flag_masked(&save_flags, new_mem->placement, TTM_PL_MASK_MEMTYPE);
  82         return 0;
  83 }
  84 EXPORT_SYMBOL(ttm_bo_move_ttm);
  85
  86 int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
  87                         void **virtual)
  88 {
  89         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
  90         unsigned long bus_offset;
  91         unsigned long bus_size;
  92         unsigned long bus_base;
  93         int ret;
  94         void *addr;
  95
  96         *virtual = NULL;
  97         ret = ttm_bo_pci_offset(bdev, mem, &bus_base, &bus_offset, &bus_size);
  98         if (ret || bus_size == 0)
  99                 return ret;
 100
 101         if (!(man->flags & TTM_MEMTYPE_FLAG_NEEDS_IOREMAP))
 102                 addr = (void *)(((u8 *) man->io_addr) + bus_offset);
 103         else {
 104                 if (mem->placement & TTM_PL_FLAG_WC)
 105                         addr = ioremap_wc(bus_base + bus_offset, bus_size);
 106                 else
 107                         addr = ioremap_nocache(bus_base + bus_offset, bus_size);
 108                 if (!addr)
 109                         return -ENOMEM;
 110         }
 111         *virtual = addr;
 112         return 0;
 113 }
 114
 115 void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
 116                          void *virtual)
 117 {
 118         struct ttm_mem_type_manager *man;
 119
 120         man = &bdev->man[mem->mem_type];
 121
 122         if (virtual && (man->flags & TTM_MEMTYPE_FLAG_NEEDS_IOREMAP))
 123                 iounmap(virtual);
 124 }
 125
 126 static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
 127 {
 128         uint32_t *dstP =
 129             (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
 130         uint32_t *srcP =
 131             (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
 132
 133         int i;
 134         for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
 135                 iowrite32(ioread32(srcP++), dstP++);
 136         return 0;
 137 }
 138
 139 static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
 140                                 unsigned long page)
 141 {
 142         struct page *d = ttm_tt_get_page(ttm, page);
 143         void *dst;
 144
 145         if (!d)
 146                 return -ENOMEM;
 147
 148         src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
 149         dst = kmap(d);
 150         if (!dst)
 151                 return -ENOMEM;
 152
 153         memcpy_fromio(dst, src, PAGE_SIZE);
 154         kunmap(d);
 155         return 0;
 156 }
 157
 158 static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
 159                                 unsigned long page)
 160 {
 161         struct page *s = ttm_tt_get_page(ttm, page);
 162         void *src;
 163
 164         if (!s)
 165                 return -ENOMEM;
 166
 167         dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
 168         src = kmap(s);
 169         if (!src)
 170                 return -ENOMEM;
 171
 172         memcpy_toio(dst, src, PAGE_SIZE);
 173         kunmap(s);
 174         return 0;
 175 }
 176
 177 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 178                        bool evict, bool no_wait, struct ttm_mem_reg *new_mem)
 179 {
 180         struct ttm_bo_device *bdev = bo->bdev;
 181         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 182         struct ttm_tt *ttm = bo->ttm;
 183         struct ttm_mem_reg *old_mem = &bo->mem;
 184         struct ttm_mem_reg old_copy = *old_mem;
 185         void *old_iomap;
 186         void *new_iomap;
 187         int ret;
 188         uint32_t save_flags = old_mem->placement;
 189         unsigned long i;
 190         unsigned long page;
 191         unsigned long add = 0;
 192         int dir;
 193
 194         ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
 195         if (ret)
 196                 return ret;
 197         ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
 198         if (ret)
 199                 goto out;
 200
 201         if (old_iomap == NULL && new_iomap == NULL)
 202                 goto out2;
 203         if (old_iomap == NULL && ttm == NULL)
 204                 goto out2;
 205
 206         add = 0;
 207         dir = 1;
 208
 209         if ((old_mem->mem_type == new_mem->mem_type) &&
 210             (new_mem->mm_node->start <
 211              old_mem->mm_node->start + old_mem->mm_node->size)) {
 212                 dir = -1;
 213                 add = new_mem->num_pages - 1;
 214         }
 215
 216         for (i = 0; i < new_mem->num_pages; ++i) {
 217                 page = i * dir + add;
 218                 if (old_iomap == NULL)
 219                         ret = ttm_copy_ttm_io_page(ttm, new_iomap, page);
 220                 else if (new_iomap == NULL)
 221                         ret = ttm_copy_io_ttm_page(ttm, old_iomap, page);
 222                 else
 223                         ret = ttm_copy_io_page(new_iomap, old_iomap, page);
 224                 if (ret)
 225                         goto out1;
 226         }
 227         mb();
 228 out2:
 229         ttm_bo_free_old_node(bo);
 230
 231         *old_mem = *new_mem;
 232         new_mem->mm_node = NULL;
 233         ttm_flag_masked(&save_flags, new_mem->placement, TTM_PL_MASK_MEMTYPE);
 234
 235         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
 236                 ttm_tt_unbind(ttm);
 237                 ttm_tt_destroy(ttm);
 238                 bo->ttm = NULL;
 239         }
 240
 241 out1:
 242         ttm_mem_reg_iounmap(bdev, new_mem, new_iomap);
 243 out:
 244         ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
 245         return ret;
 246 }
 247 EXPORT_SYMBOL(ttm_bo_move_memcpy);
 248
 249 static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
 250 {
 251         kfree(bo);
 252 }
 253
 254 /**
 255  * ttm_buffer_object_transfer
 256  *
 257  * @bo: A pointer to a struct ttm_buffer_object.
 258  * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
 259  * holding the data of @bo with the old placement.
 260  *
 261  * This is a utility function that may be called after an accelerated move
 262  * has been scheduled. A new buffer object is created as a placeholder for
 263  * the old data while it's being copied. When that buffer object is idle,
 264  * it can be destroyed, releasing the space of the old placement.
 265  * Returns:
 266  * !0: Failure.
 267  */
 268
 269 static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 270                                       struct ttm_buffer_object **new_obj)
 271 {
 272         struct ttm_buffer_object *fbo;
 273         struct ttm_bo_device *bdev = bo->bdev;
 274         struct ttm_bo_driver *driver = bdev->driver;
 275
 276         fbo = kzalloc(sizeof(*fbo), GFP_KERNEL);
 277         if (!fbo)
 278                 return -ENOMEM;
 279
 280         *fbo = *bo;
 281
 282         /**
 283          * Fix up members that we shouldn't copy directly:
 284          * TODO: Explicit member copy would probably be better here.
 285          */
 286
 287         spin_lock_init(&fbo->lock);
 288         init_waitqueue_head(&fbo->event_queue);
 289         INIT_LIST_HEAD(&fbo->ddestroy);
 290         INIT_LIST_HEAD(&fbo->lru);
 291         INIT_LIST_HEAD(&fbo->swap);
 292         fbo->vm_node = NULL;
 293
 294         fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
 295         if (fbo->mem.mm_node)
 296                 fbo->mem.mm_node->private = (void *)fbo;
 297         kref_init(&fbo->list_kref);
 298         kref_init(&fbo->kref);
 299         fbo->destroy = &ttm_transfered_destroy;
 300
 301         *new_obj = fbo;
 302         return 0;
 303 }
 304
 305 pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
 306 {
 307 #if defined(__i386__) || defined(__x86_64__)
 308         if (caching_flags & TTM_PL_FLAG_WC)
 309                 tmp = pgprot_writecombine(tmp);
 310         else if (boot_cpu_data.x86 > 3)
 311                 tmp = pgprot_noncached(tmp);
 312
 313 #elif defined(__powerpc__)
 314         if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
 315                 pgprot_val(tmp) |= _PAGE_NO_CACHE;
 316                 if (caching_flags & TTM_PL_FLAG_UNCACHED)
 317                         pgprot_val(tmp) |= _PAGE_GUARDED;
 318         }
 319 #endif
 320 #if defined(__ia64__)
 321         if (caching_flags & TTM_PL_FLAG_WC)
 322                 tmp = pgprot_writecombine(tmp);
 323         else
 324                 tmp = pgprot_noncached(tmp);
 325 #endif
 326 #if defined(__sparc__)
 327         if (!(caching_flags & TTM_PL_FLAG_CACHED))
 328                 tmp = pgprot_noncached(tmp);
 329 #endif
 330         return tmp;
 331 }
 332
 333 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
 334                           unsigned long bus_base,
 335                           unsigned long bus_offset,
 336                           unsigned long bus_size,
 337                           struct ttm_bo_kmap_obj *map)
 338 {
 339         struct ttm_bo_device *bdev = bo->bdev;
 340         struct ttm_mem_reg *mem = &bo->mem;
 341         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 342
 343         if (!(man->flags & TTM_MEMTYPE_FLAG_NEEDS_IOREMAP)) {
 344                 map->bo_kmap_type = ttm_bo_map_premapped;
 345                 map->virtual = (void *)(((u8 *) man->io_addr) + bus_offset);
 346         } else {
 347                 map->bo_kmap_type = ttm_bo_map_iomap;
 348                 if (mem->placement & TTM_PL_FLAG_WC)
 349                         map->virtual = ioremap_wc(bus_base + bus_offset,
 350                                                   bus_size);
 351                 else
 352                         map->virtual = ioremap_nocache(bus_base + bus_offset,
 353                                                        bus_size);
 354         }
 355         return (!map->virtual) ? -ENOMEM : 0;
 356 }
 357
 358 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 359                            unsigned long start_page,
 360                            unsigned long num_pages,
 361                            struct ttm_bo_kmap_obj *map)
 362 {
 363         struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
 364         struct ttm_tt *ttm = bo->ttm;
 365         struct page *d;
 366         int i;
 367
 368         BUG_ON(!ttm);
 369         if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
 370                 /*
 371                  * We're mapping a single page, and the desired
 372                  * page protection is consistent with the bo.
 373                  */
 374
 375                 map->bo_kmap_type = ttm_bo_map_kmap;
 376                 map->page = ttm_tt_get_page(ttm, start_page);
 377                 map->virtual = kmap(map->page);
 378         } else {
 379             /*
 380              * Populate the part we're mapping;
 381              */
 382                 for (i = start_page; i < start_page + num_pages; ++i) {
 383                         d = ttm_tt_get_page(ttm, i);
 384                         if (!d)
 385                                 return -ENOMEM;
 386                 }
 387
 388                 /*
 389                  * We need to use vmap to get the desired page protection
 390                  * or to make the buffer object look contigous.
 391                  */
 392                 prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
 393                         PAGE_KERNEL :
 394                         ttm_io_prot(mem->placement, PAGE_KERNEL);
 395                 map->bo_kmap_type = ttm_bo_map_vmap;
 396                 map->virtual = vmap(ttm->pages + start_page, num_pages,
 397                                     0, prot);
 398         }
 399         return (!map->virtual) ? -ENOMEM : 0;
 400 }
 401
 402 int ttm_bo_kmap(struct ttm_buffer_object *bo,
 403                 unsigned long start_page, unsigned long num_pages,
 404                 struct ttm_bo_kmap_obj *map)
 405 {
 406         int ret;
 407         unsigned long bus_base;
 408         unsigned long bus_offset;
 409         unsigned long bus_size;
 410
 411         BUG_ON(!list_empty(&bo->swap));
 412         map->virtual = NULL;
 413         if (num_pages > bo->num_pages)
 414                 return -EINVAL;
 415         if (start_page > bo->num_pages)
 416                 return -EINVAL;
 417 #if 0
 418         if (num_pages > 1 && !DRM_SUSER(DRM_CURPROC))
 419                 return -EPERM;
 420 #endif
 421         ret = ttm_bo_pci_offset(bo->bdev, &bo->mem, &bus_base,
 422                                 &bus_offset, &bus_size);
 423         if (ret)
 424                 return ret;
 425         if (bus_size == 0) {
 426                 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
 427         } else {
 428                 bus_offset += start_page << PAGE_SHIFT;
 429                 bus_size = num_pages << PAGE_SHIFT;
 430                 return ttm_bo_ioremap(bo, bus_base, bus_offset, bus_size, map);
 431         }
 432 }
 433 EXPORT_SYMBOL(ttm_bo_kmap);
 434
 435 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
 436 {
 437         if (!map->virtual)
 438                 return;
 439         switch (map->bo_kmap_type) {
 440         case ttm_bo_map_iomap:
 441                 iounmap(map->virtual);
 442                 break;
 443         case ttm_bo_map_vmap:
 444                 vunmap(map->virtual);
 445                 break;
 446         case ttm_bo_map_kmap:
 447                 kunmap(map->page);
 448                 break;
 449         case ttm_bo_map_premapped:
 450                 break;
 451         default:
 452                 BUG();
 453         }
 454         map->virtual = NULL;
 455         map->page = NULL;
 456 }
 457 EXPORT_SYMBOL(ttm_bo_kunmap);
 458
 459 int ttm_bo_pfn_prot(struct ttm_buffer_object *bo,
 460                     unsigned long dst_offset,
 461                     unsigned long *pfn, pgprot_t *prot)
 462 {
 463         struct ttm_mem_reg *mem = &bo->mem;
 464         struct ttm_bo_device *bdev = bo->bdev;
 465         unsigned long bus_offset;
 466         unsigned long bus_size;
 467         unsigned long bus_base;
 468         int ret;
 469         ret = ttm_bo_pci_offset(bdev, mem, &bus_base, &bus_offset,
 470                         &bus_size);
 471         if (ret)
 472                 return -EINVAL;
 473         if (bus_size != 0)
 474                 *pfn = (bus_base + bus_offset + dst_offset) >> PAGE_SHIFT;
 475         else
 476                 if (!bo->ttm)
 477                         return -EINVAL;
 478                 else
 479                         *pfn = page_to_pfn(ttm_tt_get_page(bo->ttm,
 480                                                            dst_offset >>
 481                                                            PAGE_SHIFT));
 482         *prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
 483                 PAGE_KERNEL : ttm_io_prot(mem->placement, PAGE_KERNEL);
 484
 485         return 0;
 486 }
 487
 488 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
 489                               void *sync_obj,
 490                               void *sync_obj_arg,
 491                               bool evict, bool no_wait,
 492                               struct ttm_mem_reg *new_mem)
 493 {
 494         struct ttm_bo_device *bdev = bo->bdev;
 495         struct ttm_bo_driver *driver = bdev->driver;
 496         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 497         struct ttm_mem_reg *old_mem = &bo->mem;
 498         int ret;
 499         uint32_t save_flags = old_mem->placement;
 500         struct ttm_buffer_object *ghost_obj;
 501         void *tmp_obj = NULL;
 502
 503         spin_lock(&bo->lock);
 504         if (bo->sync_obj) {
 505                 tmp_obj = bo->sync_obj;
 506                 bo->sync_obj = NULL;
 507         }
 508         bo->sync_obj = driver->sync_obj_ref(sync_obj);
 509         bo->sync_obj_arg = sync_obj_arg;
 510         if (evict) {
 511                 ret = ttm_bo_wait(bo, false, false, false);
 512                 spin_unlock(&bo->lock);
 513                 driver->sync_obj_unref(&bo->sync_obj);
 514
 515                 if (ret)
 516                         return ret;
 517
 518                 ttm_bo_free_old_node(bo);
 519                 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 520                     (bo->ttm != NULL)) {
 521                         ttm_tt_unbind(bo->ttm);
 522                         ttm_tt_destroy(bo->ttm);
 523                         bo->ttm = NULL;
 524                 }
 525         } else {
 526                 /**
 527                  * This should help pipeline ordinary buffer moves.
 528                  *
 529                  * Hang old buffer memory on a new buffer object,
 530                  * and leave it to be released when the GPU
 531                  * operation has completed.
 532                  */
 533
 534                 set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
 535                 spin_unlock(&bo->lock);
 536
 537                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 538                 if (ret)
 539                         return ret;
 540
 541                 /**
 542                  * If we're not moving to fixed memory, the TTM object
 543                  * needs to stay alive. Otherwhise hang it on the ghost
 544                  * bo to be unbound and destroyed.
 545                  */
 546
 547                 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
 548                         ghost_obj->ttm = NULL;
 549                 else
 550                         bo->ttm = NULL;
 551
 552                 ttm_bo_unreserve(ghost_obj);
 553                 ttm_bo_unref(&ghost_obj);
 554         }
 555
 556         *old_mem = *new_mem;
 557         new_mem->mm_node = NULL;
 558         ttm_flag_masked(&save_flags, new_mem->placement, TTM_PL_MASK_MEMTYPE);
 559         return 0;
 560 }
 561 EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);