drivers/gpu/drm/i915/i915_gem.c

   1 /*
   2  * Copyright © 2008 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #include "drmP.h"
  29 #include "drm.h"
  30 #include "i915_drm.h"
  31 #include "i915_drv.h"
  32 #include <linux/swap.h>
  33
  34 static int
  35 i915_gem_object_set_domain(struct drm_gem_object *obj,
  36                             uint32_t read_domains,
  37                             uint32_t write_domain);
  38 static int
  39 i915_gem_object_set_domain_range(struct drm_gem_object *obj,
  40                                  uint64_t offset,
  41                                  uint64_t size,
  42                                  uint32_t read_domains,
  43                                  uint32_t write_domain);
  44 static int
  45 i915_gem_set_domain(struct drm_gem_object *obj,
  46                     struct drm_file *file_priv,
  47                     uint32_t read_domains,
  48                     uint32_t write_domain);
  49 static int i915_gem_object_get_page_list(struct drm_gem_object *obj);
  50 static void i915_gem_object_free_page_list(struct drm_gem_object *obj);
  51 static int i915_gem_object_wait_rendering(struct drm_gem_object *obj);
  52
  53 static void
  54 i915_gem_cleanup_ringbuffer(struct drm_device *dev);
  55
  56 int
  57 i915_gem_init_ioctl(struct drm_device *dev, void *data,
  58                     struct drm_file *file_priv)
  59 {
  60         drm_i915_private_t *dev_priv = dev->dev_private;
  61         struct drm_i915_gem_init *args = data;
  62
  63         mutex_lock(&dev->struct_mutex);
  64
  65         if (args->gtt_start >= args->gtt_end ||
  66             (args->gtt_start & (PAGE_SIZE - 1)) != 0 ||
  67             (args->gtt_end & (PAGE_SIZE - 1)) != 0) {
  68                 mutex_unlock(&dev->struct_mutex);
  69                 return -EINVAL;
  70         }
  71
  72         drm_mm_init(&dev_priv->mm.gtt_space, args->gtt_start,
  73             args->gtt_end - args->gtt_start);
  74
  75         dev->gtt_total = (uint32_t) (args->gtt_end - args->gtt_start);
  76
  77         mutex_unlock(&dev->struct_mutex);
  78
  79         return 0;
  80 }
  81
  82 int
  83 i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
  84                             struct drm_file *file_priv)
  85 {
  86         drm_i915_private_t *dev_priv = dev->dev_private;
  87         struct drm_i915_gem_get_aperture *args = data;
  88         struct drm_i915_gem_object *obj_priv;
  89
  90         if (!(dev->driver->driver_features & DRIVER_GEM))
  91                 return -ENODEV;
  92
  93         args->aper_size = dev->gtt_total;
  94         args->aper_available_size = args->aper_size;
  95
  96         list_for_each_entry(obj_priv, &dev_priv->mm.active_list, list) {
  97                 if (obj_priv->pin_count > 0)
  98                         args->aper_available_size -= obj_priv->obj->size;
  99         }
 100
 101         return 0;
 102 }
 103
 104
 105 /**
 106  * Creates a new mm object and returns a handle to it.
 107  */
 108 int
 109 i915_gem_create_ioctl(struct drm_device *dev, void *data,
 110                       struct drm_file *file_priv)
 111 {
 112         struct drm_i915_gem_create *args = data;
 113         struct drm_gem_object *obj;
 114         int handle, ret;
 115
 116         args->size = roundup(args->size, PAGE_SIZE);
 117
 118         /* Allocate the new object */
 119         obj = drm_gem_object_alloc(dev, args->size);
 120         if (obj == NULL)
 121                 return -ENOMEM;
 122
 123         ret = drm_gem_handle_create(file_priv, obj, &handle);
 124         mutex_lock(&dev->struct_mutex);
 125         drm_gem_object_handle_unreference(obj);
 126         mutex_unlock(&dev->struct_mutex);
 127
 128         if (ret)
 129                 return ret;
 130
 131         args->handle = handle;
 132
 133         return 0;
 134 }
 135
 136 /**
 137  * Reads data from the object referenced by handle.
 138  *
 139  * On error, the contents of *data are undefined.
 140  */
 141 int
 142 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
 143                      struct drm_file *file_priv)
 144 {
 145         struct drm_i915_gem_pread *args = data;
 146         struct drm_gem_object *obj;
 147         struct drm_i915_gem_object *obj_priv;
 148         ssize_t read;
 149         loff_t offset;
 150         int ret;
 151
 152         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 153         if (obj == NULL)
 154                 return -EBADF;
 155         obj_priv = obj->driver_private;
 156
 157         /* Bounds check source.
 158          *
 159          * XXX: This could use review for overflow issues...
 160          */
 161         if (args->offset > obj->size || args->size > obj->size ||
 162             args->offset + args->size > obj->size) {
 163                 drm_gem_object_unreference(obj);
 164                 return -EINVAL;
 165         }
 166
 167         mutex_lock(&dev->struct_mutex);
 168
 169         ret = i915_gem_object_set_domain_range(obj, args->offset, args->size,
 170                                                I915_GEM_DOMAIN_CPU, 0);
 171         if (ret != 0) {
 172                 drm_gem_object_unreference(obj);
 173                 mutex_unlock(&dev->struct_mutex);
 174                 return ret;
 175         }
 176
 177         offset = args->offset;
 178
 179         read = vfs_read(obj->filp, (char __user *)(uintptr_t)args->data_ptr,
 180                         args->size, &offset);
 181         if (read != args->size) {
 182                 drm_gem_object_unreference(obj);
 183                 mutex_unlock(&dev->struct_mutex);
 184                 if (read < 0)
 185                         return read;
 186                 else
 187                         return -EINVAL;
 188         }
 189
 190         drm_gem_object_unreference(obj);
 191         mutex_unlock(&dev->struct_mutex);
 192
 193         return 0;
 194 }
 195
 196 /* This is the fast write path which cannot handle
 197  * page faults in the source data
 198  */
 199
 200 static inline int
 201 fast_user_write(struct io_mapping *mapping,
 202                 loff_t page_base, int page_offset,
 203                 char __user *user_data,
 204                 int length)
 205 {
 206         char *vaddr_atomic;
 207         unsigned long unwritten;
 208
 209         vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
 210         unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset,
 211                                                       user_data, length);
 212         io_mapping_unmap_atomic(vaddr_atomic);
 213         if (unwritten)
 214                 return -EFAULT;
 215         return 0;
 216 }
 217
 218 /* Here's the write path which can sleep for
 219  * page faults
 220  */
 221
 222 static inline int
 223 slow_user_write(struct io_mapping *mapping,
 224                 loff_t page_base, int page_offset,
 225                 char __user *user_data,
 226                 int length)
 227 {
 228         char __iomem *vaddr;
 229         unsigned long unwritten;
 230
 231         vaddr = io_mapping_map_wc(mapping, page_base);
 232         if (vaddr == NULL)
 233                 return -EFAULT;
 234         unwritten = __copy_from_user(vaddr + page_offset,
 235                                      user_data, length);
 236         io_mapping_unmap(vaddr);
 237         if (unwritten)
 238                 return -EFAULT;
 239         return 0;
 240 }
 241
 242 static int
 243 i915_gem_gtt_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
 244                     struct drm_i915_gem_pwrite *args,
 245                     struct drm_file *file_priv)
 246 {
 247         struct drm_i915_gem_object *obj_priv = obj->driver_private;
 248         drm_i915_private_t *dev_priv = dev->dev_private;
 249         ssize_t remain;
 250         loff_t offset, page_base;
 251         char __user *user_data;
 252         int page_offset, page_length;
 253         int ret;
 254
 255         user_data = (char __user *) (uintptr_t) args->data_ptr;
 256         remain = args->size;
 257         if (!access_ok(VERIFY_READ, user_data, remain))
 258                 return -EFAULT;
 259
 260
 261         mutex_lock(&dev->struct_mutex);
 262         ret = i915_gem_object_pin(obj, 0);
 263         if (ret) {
 264                 mutex_unlock(&dev->struct_mutex);
 265                 return ret;
 266         }
 267         ret = i915_gem_set_domain(obj, file_priv,
 268                                   I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
 269         if (ret)
 270                 goto fail;
 271
 272         obj_priv = obj->driver_private;
 273         offset = obj_priv->gtt_offset + args->offset;
 274         obj_priv->dirty = 1;
 275
 276         while (remain > 0) {
 277                 /* Operation in this page
 278                  *
 279                  * page_base = page offset within aperture
 280                  * page_offset = offset within page
 281                  * page_length = bytes to copy for this page
 282                  */
 283                 page_base = (offset & ~(PAGE_SIZE-1));
 284                 page_offset = offset & (PAGE_SIZE-1);
 285                 page_length = remain;
 286                 if ((page_offset + remain) > PAGE_SIZE)
 287                         page_length = PAGE_SIZE - page_offset;
 288
 289                 ret = fast_user_write (dev_priv->mm.gtt_mapping, page_base,
 290                                        page_offset, user_data, page_length);
 291
 292                 /* If we get a fault while copying data, then (presumably) our
 293                  * source page isn't available. In this case, use the
 294                  * non-atomic function
 295                  */
 296                 if (ret) {
 297                         ret = slow_user_write (dev_priv->mm.gtt_mapping,
 298                                                page_base, page_offset,
 299                                                user_data, page_length);
 300                         if (ret)
 301                                 goto fail;
 302                 }
 303
 304                 remain -= page_length;
 305                 user_data += page_length;
 306                 offset += page_length;
 307         }
 308
 309 fail:
 310         i915_gem_object_unpin(obj);
 311         mutex_unlock(&dev->struct_mutex);
 312
 313         return ret;
 314 }
 315
 316 static int
 317 i915_gem_shmem_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
 318                       struct drm_i915_gem_pwrite *args,
 319                       struct drm_file *file_priv)
 320 {
 321         int ret;
 322         loff_t offset;
 323         ssize_t written;
 324
 325         mutex_lock(&dev->struct_mutex);
 326
 327         ret = i915_gem_set_domain(obj, file_priv,
 328                                   I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
 329         if (ret) {
 330                 mutex_unlock(&dev->struct_mutex);
 331                 return ret;
 332         }
 333
 334         offset = args->offset;
 335
 336         written = vfs_write(obj->filp,
 337                             (char __user *)(uintptr_t) args->data_ptr,
 338                             args->size, &offset);
 339         if (written != args->size) {
 340                 mutex_unlock(&dev->struct_mutex);
 341                 if (written < 0)
 342                         return written;
 343                 else
 344                         return -EINVAL;
 345         }
 346
 347         mutex_unlock(&dev->struct_mutex);
 348
 349         return 0;
 350 }
 351
 352 /**
 353  * Writes data to the object referenced by handle.
 354  *
 355  * On error, the contents of the buffer that were to be modified are undefined.
 356  */
 357 int
 358 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
 359                       struct drm_file *file_priv)
 360 {
 361         struct drm_i915_gem_pwrite *args = data;
 362         struct drm_gem_object *obj;
 363         struct drm_i915_gem_object *obj_priv;
 364         int ret = 0;
 365
 366         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 367         if (obj == NULL)
 368                 return -EBADF;
 369         obj_priv = obj->driver_private;
 370
 371         /* Bounds check destination.
 372          *
 373          * XXX: This could use review for overflow issues...
 374          */
 375         if (args->offset > obj->size || args->size > obj->size ||
 376             args->offset + args->size > obj->size) {
 377                 drm_gem_object_unreference(obj);
 378                 return -EINVAL;
 379         }
 380
 381         /* We can only do the GTT pwrite on untiled buffers, as otherwise
 382          * it would end up going through the fenced access, and we'll get
 383          * different detiling behavior between reading and writing.
 384          * pread/pwrite currently are reading and writing from the CPU
 385          * perspective, requiring manual detiling by the client.
 386          */
 387         if (obj_priv->tiling_mode == I915_TILING_NONE &&
 388             dev->gtt_total != 0)
 389                 ret = i915_gem_gtt_pwrite(dev, obj, args, file_priv);
 390         else
 391                 ret = i915_gem_shmem_pwrite(dev, obj, args, file_priv);
 392
 393 #if WATCH_PWRITE
 394         if (ret)
 395                 DRM_INFO("pwrite failed %d\n", ret);
 396 #endif
 397
 398         drm_gem_object_unreference(obj);
 399
 400         return ret;
 401 }
 402
 403 /**
 404  * Called when user space prepares to use an object
 405  */
 406 int
 407 i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 408                           struct drm_file *file_priv)
 409 {
 410         struct drm_i915_gem_set_domain *args = data;
 411         struct drm_gem_object *obj;
 412         int ret;
 413
 414         if (!(dev->driver->driver_features & DRIVER_GEM))
 415                 return -ENODEV;
 416
 417         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 418         if (obj == NULL)
 419                 return -EBADF;
 420
 421         mutex_lock(&dev->struct_mutex);
 422 #if WATCH_BUF
 423         DRM_INFO("set_domain_ioctl %p(%d), %08x %08x\n",
 424                  obj, obj->size, args->read_domains, args->write_domain);
 425 #endif
 426         ret = i915_gem_set_domain(obj, file_priv,
 427                                   args->read_domains, args->write_domain);
 428         drm_gem_object_unreference(obj);
 429         mutex_unlock(&dev->struct_mutex);
 430         return ret;
 431 }
 432
 433 /**
 434  * Called when user space has done writes to this buffer
 435  */
 436 int
 437 i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
 438                       struct drm_file *file_priv)
 439 {
 440         struct drm_i915_gem_sw_finish *args = data;
 441         struct drm_gem_object *obj;
 442         struct drm_i915_gem_object *obj_priv;
 443         int ret = 0;
 444
 445         if (!(dev->driver->driver_features & DRIVER_GEM))
 446                 return -ENODEV;
 447
 448         mutex_lock(&dev->struct_mutex);
 449         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 450         if (obj == NULL) {
 451                 mutex_unlock(&dev->struct_mutex);
 452                 return -EBADF;
 453         }
 454
 455 #if WATCH_BUF
 456         DRM_INFO("%s: sw_finish %d (%p %d)\n",
 457                  __func__, args->handle, obj, obj->size);
 458 #endif
 459         obj_priv = obj->driver_private;
 460
 461         /* Pinned buffers may be scanout, so flush the cache */
 462         if ((obj->write_domain & I915_GEM_DOMAIN_CPU) && obj_priv->pin_count) {
 463                 i915_gem_clflush_object(obj);
 464                 drm_agp_chipset_flush(dev);
 465         }
 466         drm_gem_object_unreference(obj);
 467         mutex_unlock(&dev->struct_mutex);
 468         return ret;
 469 }
 470
 471 /**
 472  * Maps the contents of an object, returning the address it is mapped
 473  * into.
 474  *
 475  * While the mapping holds a reference on the contents of the object, it doesn't
 476  * imply a ref on the object itself.
 477  */
 478 int
 479 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 480                    struct drm_file *file_priv)
 481 {
 482         struct drm_i915_gem_mmap *args = data;
 483         struct drm_gem_object *obj;
 484         loff_t offset;
 485         unsigned long addr;
 486
 487         if (!(dev->driver->driver_features & DRIVER_GEM))
 488                 return -ENODEV;
 489
 490         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 491         if (obj == NULL)
 492                 return -EBADF;
 493
 494         offset = args->offset;
 495
 496         down_write(&current->mm->mmap_sem);
 497         addr = do_mmap(obj->filp, 0, args->size,
 498                        PROT_READ | PROT_WRITE, MAP_SHARED,
 499                        args->offset);
 500         up_write(&current->mm->mmap_sem);
 501         mutex_lock(&dev->struct_mutex);
 502         drm_gem_object_unreference(obj);
 503         mutex_unlock(&dev->struct_mutex);
 504         if (IS_ERR((void *)addr))
 505                 return addr;
 506
 507         args->addr_ptr = (uint64_t) addr;
 508
 509         return 0;
 510 }
 511
 512 static void
 513 i915_gem_object_free_page_list(struct drm_gem_object *obj)
 514 {
 515         struct drm_i915_gem_object *obj_priv = obj->driver_private;
 516         int page_count = obj->size / PAGE_SIZE;
 517         int i;
 518
 519         if (obj_priv->page_list == NULL)
 520                 return;
 521
 522
 523         for (i = 0; i < page_count; i++)
 524                 if (obj_priv->page_list[i] != NULL) {
 525                         if (obj_priv->dirty)
 526                                 set_page_dirty(obj_priv->page_list[i]);
 527                         mark_page_accessed(obj_priv->page_list[i]);
 528                         page_cache_release(obj_priv->page_list[i]);
 529                 }
 530         obj_priv->dirty = 0;
 531
 532         drm_free(obj_priv->page_list,
 533                  page_count * sizeof(struct page *),
 534                  DRM_MEM_DRIVER);
 535         obj_priv->page_list = NULL;
 536 }
 537
 538 static void
 539 i915_gem_object_move_to_active(struct drm_gem_object *obj)
 540 {
 541         struct drm_device *dev = obj->dev;
 542         drm_i915_private_t *dev_priv = dev->dev_private;
 543         struct drm_i915_gem_object *obj_priv = obj->driver_private;
 544
 545         /* Add a reference if we're newly entering the active list. */
 546         if (!obj_priv->active) {
 547                 drm_gem_object_reference(obj);
 548                 obj_priv->active = 1;
 549         }
 550         /* Move from whatever list we were on to the tail of execution. */
 551         list_move_tail(&obj_priv->list,
 552                        &dev_priv->mm.active_list);
 553 }
 554
 555
 556 static void
 557 i915_gem_object_move_to_inactive(struct drm_gem_object *obj)
 558 {
 559         struct drm_device *dev = obj->dev;
 560         drm_i915_private_t *dev_priv = dev->dev_private;
 561         struct drm_i915_gem_object *obj_priv = obj->driver_private;
 562
 563         i915_verify_inactive(dev, __FILE__, __LINE__);
 564         if (obj_priv->pin_count != 0)
 565                 list_del_init(&obj_priv->list);
 566         else
 567                 list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
 568
 569         if (obj_priv->active) {
 570                 obj_priv->active = 0;
 571                 drm_gem_object_unreference(obj);
 572         }
 573         i915_verify_inactive(dev, __FILE__, __LINE__);
 574 }
 575
 576 /**
 577  * Creates a new sequence number, emitting a write of it to the status page
 578  * plus an interrupt, which will trigger i915_user_interrupt_handler.
 579  *
 580  * Must be called with struct_lock held.
 581  *
 582  * Returned sequence numbers are nonzero on success.
 583  */
 584 static uint32_t
 585 i915_add_request(struct drm_device *dev, uint32_t flush_domains)
 586 {
 587         drm_i915_private_t *dev_priv = dev->dev_private;
 588         struct drm_i915_gem_request *request;
 589         uint32_t seqno;
 590         int was_empty;
 591         RING_LOCALS;
 592
 593         request = drm_calloc(1, sizeof(*request), DRM_MEM_DRIVER);
 594         if (request == NULL)
 595                 return 0;
 596
 597         /* Grab the seqno we're going to make this request be, and bump the
 598          * next (skipping 0 so it can be the reserved no-seqno value).
 599          */
 600         seqno = dev_priv->mm.next_gem_seqno;
 601         dev_priv->mm.next_gem_seqno++;
 602         if (dev_priv->mm.next_gem_seqno == 0)
 603                 dev_priv->mm.next_gem_seqno++;
 604
 605         BEGIN_LP_RING(4);
 606         OUT_RING(MI_STORE_DWORD_INDEX);
 607         OUT_RING(I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 608         OUT_RING(seqno);
 609
 610         OUT_RING(MI_USER_INTERRUPT);
 611         ADVANCE_LP_RING();
 612
 613         DRM_DEBUG("%d\n", seqno);
 614
 615         request->seqno = seqno;
 616         request->emitted_jiffies = jiffies;
 617         request->flush_domains = flush_domains;
 618         was_empty = list_empty(&dev_priv->mm.request_list);
 619         list_add_tail(&request->list, &dev_priv->mm.request_list);
 620
 621         if (was_empty && !dev_priv->mm.suspended)
 622                 schedule_delayed_work(&dev_priv->mm.retire_work, HZ);
 623         return seqno;
 624 }
 625
 626 /**
 627  * Command execution barrier
 628  *
 629  * Ensures that all commands in the ring are finished
 630  * before signalling the CPU
 631  */
 632 static uint32_t
 633 i915_retire_commands(struct drm_device *dev)
 634 {
 635         drm_i915_private_t *dev_priv = dev->dev_private;
 636         uint32_t cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;
 637         uint32_t flush_domains = 0;
 638         RING_LOCALS;
 639
 640         /* The sampler always gets flushed on i965 (sigh) */
 641         if (IS_I965G(dev))
 642                 flush_domains |= I915_GEM_DOMAIN_SAMPLER;
 643         BEGIN_LP_RING(2);
 644         OUT_RING(cmd);
 645         OUT_RING(0); /* noop */
 646         ADVANCE_LP_RING();
 647         return flush_domains;
 648 }
 649
 650 /**
 651  * Moves buffers associated only with the given active seqno from the active
 652  * to inactive list, potentially freeing them.
 653  */
 654 static void
 655 i915_gem_retire_request(struct drm_device *dev,
 656                         struct drm_i915_gem_request *request)
 657 {
 658         drm_i915_private_t *dev_priv = dev->dev_private;
 659
 660         /* Move any buffers on the active list that are no longer referenced
 661          * by the ringbuffer to the flushing/inactive lists as appropriate.
 662          */
 663         while (!list_empty(&dev_priv->mm.active_list)) {
 664                 struct drm_gem_object *obj;
 665                 struct drm_i915_gem_object *obj_priv;
 666
 667                 obj_priv = list_first_entry(&dev_priv->mm.active_list,
 668                                             struct drm_i915_gem_object,
 669                                             list);
 670                 obj = obj_priv->obj;
 671
 672                 /* If the seqno being retired doesn't match the oldest in the
 673                  * list, then the oldest in the list must still be newer than
 674                  * this seqno.
 675                  */
 676                 if (obj_priv->last_rendering_seqno != request->seqno)
 677                         return;
 678 #if WATCH_LRU
 679                 DRM_INFO("%s: retire %d moves to inactive list %p\n",
 680                          __func__, request->seqno, obj);
 681 #endif
 682
 683                 if (obj->write_domain != 0) {
 684                         list_move_tail(&obj_priv->list,
 685                                        &dev_priv->mm.flushing_list);
 686                 } else {
 687                         i915_gem_object_move_to_inactive(obj);
 688                 }
 689         }
 690
 691         if (request->flush_domains != 0) {
 692                 struct drm_i915_gem_object *obj_priv, *next;
 693
 694                 /* Clear the write domain and activity from any buffers
 695                  * that are just waiting for a flush matching the one retired.
 696                  */
 697                 list_for_each_entry_safe(obj_priv, next,
 698                                          &dev_priv->mm.flushing_list, list) {
 699                         struct drm_gem_object *obj = obj_priv->obj;
 700
 701                         if (obj->write_domain & request->flush_domains) {
 702                                 obj->write_domain = 0;
 703                                 i915_gem_object_move_to_inactive(obj);
 704                         }
 705                 }
 706
 707         }
 708 }
 709
 710 /**
 711  * Returns true if seq1 is later than seq2.
 712  */
 713 static int
 714 i915_seqno_passed(uint32_t seq1, uint32_t seq2)
 715 {
 716         return (int32_t)(seq1 - seq2) >= 0;
 717 }
 718
 719 uint32_t
 720 i915_get_gem_seqno(struct drm_device *dev)
 721 {
 722         drm_i915_private_t *dev_priv = dev->dev_private;
 723
 724         return READ_HWSP(dev_priv, I915_GEM_HWS_INDEX);
 725 }
 726
 727 /**
 728  * This function clears the request list as sequence numbers are passed.
 729  */
 730 void
 731 i915_gem_retire_requests(struct drm_device *dev)
 732 {
 733         drm_i915_private_t *dev_priv = dev->dev_private;
 734         uint32_t seqno;
 735
 736         seqno = i915_get_gem_seqno(dev);
 737
 738         while (!list_empty(&dev_priv->mm.request_list)) {
 739                 struct drm_i915_gem_request *request;
 740                 uint32_t retiring_seqno;
 741
 742                 request = list_first_entry(&dev_priv->mm.request_list,
 743                                            struct drm_i915_gem_request,
 744                                            list);
 745                 retiring_seqno = request->seqno;
 746
 747                 if (i915_seqno_passed(seqno, retiring_seqno) ||
 748                     dev_priv->mm.wedged) {
 749                         i915_gem_retire_request(dev, request);
 750
 751                         list_del(&request->list);
 752                         drm_free(request, sizeof(*request), DRM_MEM_DRIVER);
 753                 } else
 754                         break;
 755         }
 756 }
 757
 758 void
 759 i915_gem_retire_work_handler(struct work_struct *work)
 760 {
 761         drm_i915_private_t *dev_priv;
 762         struct drm_device *dev;
 763
 764         dev_priv = container_of(work, drm_i915_private_t,
 765                                 mm.retire_work.work);
 766         dev = dev_priv->dev;
 767
 768         mutex_lock(&dev->struct_mutex);
 769         i915_gem_retire_requests(dev);
 770         if (!dev_priv->mm.suspended &&
 771             !list_empty(&dev_priv->mm.request_list))
 772                 schedule_delayed_work(&dev_priv->mm.retire_work, HZ);
 773         mutex_unlock(&dev->struct_mutex);
 774 }
 775
 776 /**
 777  * Waits for a sequence number to be signaled, and cleans up the
 778  * request and object lists appropriately for that event.
 779  */
 780 static int
 781 i915_wait_request(struct drm_device *dev, uint32_t seqno)
 782 {
 783         drm_i915_private_t *dev_priv = dev->dev_private;
 784         int ret = 0;
 785
 786         BUG_ON(seqno == 0);
 787
 788         if (!i915_seqno_passed(i915_get_gem_seqno(dev), seqno)) {
 789                 dev_priv->mm.waiting_gem_seqno = seqno;
 790                 i915_user_irq_get(dev);
 791                 ret = wait_event_interruptible(dev_priv->irq_queue,
 792                                                i915_seqno_passed(i915_get_gem_seqno(dev),
 793                                                                  seqno) ||
 794                                                dev_priv->mm.wedged);
 795                 i915_user_irq_put(dev);
 796                 dev_priv->mm.waiting_gem_seqno = 0;
 797         }
 798         if (dev_priv->mm.wedged)
 799                 ret = -EIO;
 800
 801         if (ret && ret != -ERESTARTSYS)
 802                 DRM_ERROR("%s returns %d (awaiting %d at %d)\n",
 803                           __func__, ret, seqno, i915_get_gem_seqno(dev));
 804
 805         /* Directly dispatch request retiring.  While we have the work queue
 806          * to handle this, the waiter on a request often wants an associated
 807          * buffer to have made it to the inactive list, and we would need
 808          * a separate wait queue to handle that.
 809          */
 810         if (ret == 0)
 811                 i915_gem_retire_requests(dev);
 812
 813         return ret;
 814 }
 815
 816 static void
 817 i915_gem_flush(struct drm_device *dev,
 818                uint32_t invalidate_domains,
 819                uint32_t flush_domains)
 820 {
 821         drm_i915_private_t *dev_priv = dev->dev_private;
 822         uint32_t cmd;
 823         RING_LOCALS;
 824
 825 #if WATCH_EXEC
 826         DRM_INFO("%s: invalidate %08x flush %08x\n", __func__,
 827                   invalidate_domains, flush_domains);
 828 #endif
 829
 830         if (flush_domains & I915_GEM_DOMAIN_CPU)
 831                 drm_agp_chipset_flush(dev);
 832
 833         if ((invalidate_domains | flush_domains) & ~(I915_GEM_DOMAIN_CPU |
 834                                                      I915_GEM_DOMAIN_GTT)) {
 835                 /*
 836                  * read/write caches:
 837                  *
 838                  * I915_GEM_DOMAIN_RENDER is always invalidated, but is
 839                  * only flushed if MI_NO_WRITE_FLUSH is unset.  On 965, it is
 840                  * also flushed at 2d versus 3d pipeline switches.
 841                  *
 842                  * read-only caches:
 843                  *
 844                  * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
 845                  * MI_READ_FLUSH is set, and is always flushed on 965.
 846                  *
 847                  * I915_GEM_DOMAIN_COMMAND may not exist?
 848                  *
 849                  * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
 850                  * invalidated when MI_EXE_FLUSH is set.
 851                  *
 852                  * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
 853                  * invalidated with every MI_FLUSH.
 854                  *
 855                  * TLBs:
 856                  *
 857                  * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
 858                  * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
 859                  * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
 860                  * are flushed at any MI_FLUSH.
 861                  */
 862
 863                 cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;
 864                 if ((invalidate_domains|flush_domains) &
 865                     I915_GEM_DOMAIN_RENDER)
 866                         cmd &= ~MI_NO_WRITE_FLUSH;
 867                 if (!IS_I965G(dev)) {
 868                         /*
 869                          * On the 965, the sampler cache always gets flushed
 870                          * and this bit is reserved.
 871                          */
 872                         if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER)
 873                                 cmd |= MI_READ_FLUSH;
 874                 }
 875                 if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION)
 876                         cmd |= MI_EXE_FLUSH;
 877
 878 #if WATCH_EXEC
 879                 DRM_INFO("%s: queue flush %08x to ring\n", __func__, cmd);
 880 #endif
 881                 BEGIN_LP_RING(2);
 882                 OUT_RING(cmd);
 883                 OUT_RING(0); /* noop */
 884                 ADVANCE_LP_RING();
 885         }
 886 }
 887
 888 /**
 889  * Ensures that all rendering to the object has completed and the object is
 890  * safe to unbind from the GTT or access from the CPU.
 891  */
 892 static int
 893 i915_gem_object_wait_rendering(struct drm_gem_object *obj)
 894 {
 895         struct drm_device *dev = obj->dev;
 896         struct drm_i915_gem_object *obj_priv = obj->driver_private;
 897         int ret;
 898
 899         /* If there are writes queued to the buffer, flush and
 900          * create a new seqno to wait for.
 901          */
 902         if (obj->write_domain & ~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT)) {
 903                 uint32_t write_domain = obj->write_domain;
 904 #if WATCH_BUF
 905                 DRM_INFO("%s: flushing object %p from write domain %08x\n",
 906                           __func__, obj, write_domain);
 907 #endif
 908                 i915_gem_flush(dev, 0, write_domain);
 909
 910                 i915_gem_object_move_to_active(obj);
 911                 obj_priv->last_rendering_seqno = i915_add_request(dev,
 912                                                                   write_domain);
 913                 BUG_ON(obj_priv->last_rendering_seqno == 0);
 914 #if WATCH_LRU
 915                 DRM_INFO("%s: flush moves to exec list %p\n", __func__, obj);
 916 #endif
 917         }
 918
 919         /* If there is rendering queued on the buffer being evicted, wait for
 920          * it.
 921          */
 922         if (obj_priv->active) {
 923 #if WATCH_BUF
 924                 DRM_INFO("%s: object %p wait for seqno %08x\n",
 925                           __func__, obj, obj_priv->last_rendering_seqno);
 926 #endif
 927                 ret = i915_wait_request(dev, obj_priv->last_rendering_seqno);
 928                 if (ret != 0)
 929                         return ret;
 930         }
 931
 932         return 0;
 933 }
 934
 935 /**
 936  * Unbinds an object from the GTT aperture.
 937  */
 938 static int
 939 i915_gem_object_unbind(struct drm_gem_object *obj)
 940 {
 941         struct drm_device *dev = obj->dev;
 942         struct drm_i915_gem_object *obj_priv = obj->driver_private;
 943         int ret = 0;
 944
 945 #if WATCH_BUF
 946         DRM_INFO("%s:%d %p\n", __func__, __LINE__, obj);
 947         DRM_INFO("gtt_space %p\n", obj_priv->gtt_space);
 948 #endif
 949         if (obj_priv->gtt_space == NULL)
 950                 return 0;
 951
 952         if (obj_priv->pin_count != 0) {
 953                 DRM_ERROR("Attempting to unbind pinned buffer\n");
 954                 return -EINVAL;
 955         }
 956
 957         /* Wait for any rendering to complete
 958          */
 959         ret = i915_gem_object_wait_rendering(obj);
 960         if (ret) {
 961                 DRM_ERROR("wait_rendering failed: %d\n", ret);
 962                 return ret;
 963         }
 964
 965         /* Move the object to the CPU domain to ensure that
 966          * any possible CPU writes while it's not in the GTT
 967          * are flushed when we go to remap it. This will
 968          * also ensure that all pending GPU writes are finished
 969          * before we unbind.
 970          */
 971         ret = i915_gem_object_set_domain(obj, I915_GEM_DOMAIN_CPU,
 972                                          I915_GEM_DOMAIN_CPU);
 973         if (ret) {
 974                 DRM_ERROR("set_domain failed: %d\n", ret);
 975                 return ret;
 976         }
 977
 978         if (obj_priv->agp_mem != NULL) {
 979                 drm_unbind_agp(obj_priv->agp_mem);
 980                 drm_free_agp(obj_priv->agp_mem, obj->size / PAGE_SIZE);
 981                 obj_priv->agp_mem = NULL;
 982         }
 983
 984         BUG_ON(obj_priv->active);
 985
 986         i915_gem_object_free_page_list(obj);
 987
 988         if (obj_priv->gtt_space) {
 989                 atomic_dec(&dev->gtt_count);
 990                 atomic_sub(obj->size, &dev->gtt_memory);
 991
 992                 drm_mm_put_block(obj_priv->gtt_space);
 993                 obj_priv->gtt_space = NULL;
 994         }
 995
 996         /* Remove ourselves from the LRU list if present. */
 997         if (!list_empty(&obj_priv->list))
 998                 list_del_init(&obj_priv->list);
 999
1000         return 0;
1001 }
1002
1003 static int
1004 i915_gem_evict_something(struct drm_device *dev)
1005 {
1006         drm_i915_private_t *dev_priv = dev->dev_private;
1007         struct drm_gem_object *obj;
1008         struct drm_i915_gem_object *obj_priv;
1009         int ret = 0;
1010
1011         for (;;) {
1012                 /* If there's an inactive buffer available now, grab it
1013                  * and be done.
1014                  */
1015                 if (!list_empty(&dev_priv->mm.inactive_list)) {
1016                         obj_priv = list_first_entry(&dev_priv->mm.inactive_list,
1017                                                     struct drm_i915_gem_object,
1018                                                     list);
1019                         obj = obj_priv->obj;
1020                         BUG_ON(obj_priv->pin_count != 0);
1021 #if WATCH_LRU
1022                         DRM_INFO("%s: evicting %p\n", __func__, obj);
1023 #endif
1024                         BUG_ON(obj_priv->active);
1025
1026                         /* Wait on the rendering and unbind the buffer. */
1027                         ret = i915_gem_object_unbind(obj);
1028                         break;
1029                 }
1030
1031                 /* If we didn't get anything, but the ring is still processing
1032                  * things, wait for one of those things to finish and hopefully
1033                  * leave us a buffer to evict.
1034                  */
1035                 if (!list_empty(&dev_priv->mm.request_list)) {
1036                         struct drm_i915_gem_request *request;
1037
1038                         request = list_first_entry(&dev_priv->mm.request_list,
1039                                                    struct drm_i915_gem_request,
1040                                                    list);
1041
1042                         ret = i915_wait_request(dev, request->seqno);
1043                         if (ret)
1044                                 break;
1045
1046                         /* if waiting caused an object to become inactive,
1047                          * then loop around and wait for it. Otherwise, we
1048                          * assume that waiting freed and unbound something,
1049                          * so there should now be some space in the GTT
1050                          */
1051                         if (!list_empty(&dev_priv->mm.inactive_list))
1052                                 continue;
1053                         break;
1054                 }
1055
1056                 /* If we didn't have anything on the request list but there
1057                  * are buffers awaiting a flush, emit one and try again.
1058                  * When we wait on it, those buffers waiting for that flush
1059                  * will get moved to inactive.
1060                  */
1061                 if (!list_empty(&dev_priv->mm.flushing_list)) {
1062                         obj_priv = list_first_entry(&dev_priv->mm.flushing_list,
1063                                                     struct drm_i915_gem_object,
1064                                                     list);
1065                         obj = obj_priv->obj;
1066
1067                         i915_gem_flush(dev,
1068                                        obj->write_domain,
1069                                        obj->write_domain);
1070                         i915_add_request(dev, obj->write_domain);
1071
1072                         obj = NULL;
1073                         continue;
1074                 }
1075
1076                 DRM_ERROR("inactive empty %d request empty %d "
1077                           "flushing empty %d\n",
1078                           list_empty(&dev_priv->mm.inactive_list),
1079                           list_empty(&dev_priv->mm.request_list),
1080                           list_empty(&dev_priv->mm.flushing_list));
1081                 /* If we didn't do any of the above, there's nothing to be done
1082                  * and we just can't fit it in.
1083                  */
1084                 return -ENOMEM;
1085         }
1086         return ret;
1087 }
1088
1089 static int
1090 i915_gem_object_get_page_list(struct drm_gem_object *obj)
1091 {
1092         struct drm_i915_gem_object *obj_priv = obj->driver_private;
1093         int page_count, i;
1094         struct address_space *mapping;
1095         struct inode *inode;
1096         struct page *page;
1097         int ret;
1098
1099         if (obj_priv->page_list)
1100                 return 0;
1101
1102         /* Get the list of pages out of our struct file.  They'll be pinned
1103          * at this point until we release them.
1104          */
1105         page_count = obj->size / PAGE_SIZE;
1106         BUG_ON(obj_priv->page_list != NULL);
1107         obj_priv->page_list = drm_calloc(page_count, sizeof(struct page *),
1108                                          DRM_MEM_DRIVER);
1109         if (obj_priv->page_list == NULL) {
1110                 DRM_ERROR("Faled to allocate page list\n");
1111                 return -ENOMEM;
1112         }
1113
1114         inode = obj->filp->f_path.dentry->d_inode;
1115         mapping = inode->i_mapping;
1116         for (i = 0; i < page_count; i++) {
1117                 page = read_mapping_page(mapping, i, NULL);
1118                 if (IS_ERR(page)) {
1119                         ret = PTR_ERR(page);
1120                         DRM_ERROR("read_mapping_page failed: %d\n", ret);
1121                         i915_gem_object_free_page_list(obj);
1122                         return ret;
1123                 }
1124                 obj_priv->page_list[i] = page;
1125         }
1126         return 0;
1127 }
1128
1129 /**
1130  * Finds free space in the GTT aperture and binds the object there.
1131  */
1132 static int
1133 i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
1134 {
1135         struct drm_device *dev = obj->dev;
1136         drm_i915_private_t *dev_priv = dev->dev_private;
1137         struct drm_i915_gem_object *obj_priv = obj->driver_private;
1138         struct drm_mm_node *free_space;
1139         int page_count, ret;
1140
1141         if (alignment == 0)
1142                 alignment = PAGE_SIZE;
1143         if (alignment & (PAGE_SIZE - 1)) {
1144                 DRM_ERROR("Invalid object alignment requested %u\n", alignment);
1145                 return -EINVAL;
1146         }
1147
1148  search_free:
1149         free_space = drm_mm_search_free(&dev_priv->mm.gtt_space,
1150                                         obj->size, alignment, 0);
1151         if (free_space != NULL) {
1152                 obj_priv->gtt_space = drm_mm_get_block(free_space, obj->size,
1153                                                        alignment);
1154                 if (obj_priv->gtt_space != NULL) {
1155                         obj_priv->gtt_space->private = obj;
1156                         obj_priv->gtt_offset = obj_priv->gtt_space->start;
1157                 }
1158         }
1159         if (obj_priv->gtt_space == NULL) {
1160                 /* If the gtt is empty and we're still having trouble
1161                  * fitting our object in, we're out of memory.
1162                  */
1163 #if WATCH_LRU
1164                 DRM_INFO("%s: GTT full, evicting something\n", __func__);
1165 #endif
1166                 if (list_empty(&dev_priv->mm.inactive_list) &&
1167                     list_empty(&dev_priv->mm.flushing_list) &&
1168                     list_empty(&dev_priv->mm.active_list)) {
1169                         DRM_ERROR("GTT full, but LRU list empty\n");
1170                         return -ENOMEM;
1171                 }
1172
1173                 ret = i915_gem_evict_something(dev);
1174                 if (ret != 0) {
1175                         DRM_ERROR("Failed to evict a buffer %d\n", ret);
1176                         return ret;
1177                 }
1178                 goto search_free;
1179         }
1180
1181 #if WATCH_BUF
1182         DRM_INFO("Binding object of size %d at 0x%08x\n",
1183                  obj->size, obj_priv->gtt_offset);
1184 #endif
1185         ret = i915_gem_object_get_page_list(obj);
1186         if (ret) {
1187                 drm_mm_put_block(obj_priv->gtt_space);
1188                 obj_priv->gtt_space = NULL;
1189                 return ret;
1190         }
1191
1192         page_count = obj->size / PAGE_SIZE;
1193         /* Create an AGP memory structure pointing at our pages, and bind it
1194          * into the GTT.
1195          */
1196         obj_priv->agp_mem = drm_agp_bind_pages(dev,
1197                                                obj_priv->page_list,
1198                                                page_count,
1199                                                obj_priv->gtt_offset,
1200                                                obj_priv->agp_type);
1201         if (obj_priv->agp_mem == NULL) {
1202                 i915_gem_object_free_page_list(obj);
1203                 drm_mm_put_block(obj_priv->gtt_space);
1204                 obj_priv->gtt_space = NULL;
1205                 return -ENOMEM;
1206         }
1207         atomic_inc(&dev->gtt_count);
1208         atomic_add(obj->size, &dev->gtt_memory);
1209
1210         /* Assert that the object is not currently in any GPU domain. As it
1211          * wasn't in the GTT, there shouldn't be any way it could have been in
1212          * a GPU cache
1213          */
1214         BUG_ON(obj->read_domains & ~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT));
1215         BUG_ON(obj->write_domain & ~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT));
1216
1217         return 0;
1218 }
1219
1220 void
1221 i915_gem_clflush_object(struct drm_gem_object *obj)
1222 {
1223         struct drm_i915_gem_object      *obj_priv = obj->driver_private;
1224
1225         /* If we don't have a page list set up, then we're not pinned
1226          * to GPU, and we can ignore the cache flush because it'll happen
1227          * again at bind time.
1228          */
1229         if (obj_priv->page_list == NULL)
1230                 return;
1231
1232         drm_clflush_pages(obj_priv->page_list, obj->size / PAGE_SIZE);
1233 }
1234
1235 /*
1236  * Set the next domain for the specified object. This
1237  * may not actually perform the necessary flushing/invaliding though,
1238  * as that may want to be batched with other set_domain operations
1239  *
1240  * This is (we hope) the only really tricky part of gem. The goal
1241  * is fairly simple -- track which caches hold bits of the object
1242  * and make sure they remain coherent. A few concrete examples may
1243  * help to explain how it works. For shorthand, we use the notation
1244  * (read_domains, write_domain), e.g. (CPU, CPU) to indicate the
1245  * a pair of read and write domain masks.
1246  *
1247  * Case 1: the batch buffer
1248  *
1249  *      1. Allocated
1250  *      2. Written by CPU
1251  *      3. Mapped to GTT
1252  *      4. Read by GPU
1253  *      5. Unmapped from GTT
1254  *      6. Freed
1255  *
1256  *      Let's take these a step at a time
1257  *
1258  *      1. Allocated
1259  *              Pages allocated from the kernel may still have
1260  *              cache contents, so we set them to (CPU, CPU) always.
1261  *      2. Written by CPU (using pwrite)
1262  *              The pwrite function calls set_domain (CPU, CPU) and
1263  *              this function does nothing (as nothing changes)
1264  *      3. Mapped by GTT
1265  *              This function asserts that the object is not
1266  *              currently in any GPU-based read or write domains
1267  *      4. Read by GPU
1268  *              i915_gem_execbuffer calls set_domain (COMMAND, 0).
1269  *              As write_domain is zero, this function adds in the
1270  *              current read domains (CPU+COMMAND, 0).
1271  *              flush_domains is set to CPU.
1272  *              invalidate_domains is set to COMMAND
1273  *              clflush is run to get data out of the CPU caches
1274  *              then i915_dev_set_domain calls i915_gem_flush to
1275  *              emit an MI_FLUSH and drm_agp_chipset_flush
1276  *      5. Unmapped from GTT
1277  *              i915_gem_object_unbind calls set_domain (CPU, CPU)
1278  *              flush_domains and invalidate_domains end up both zero
1279  *              so no flushing/invalidating happens
1280  *      6. Freed
1281  *              yay, done
1282  *
1283  * Case 2: The shared render buffer
1284  *
1285  *      1. Allocated
1286  *      2. Mapped to GTT
1287  *      3. Read/written by GPU
1288  *      4. set_domain to (CPU,CPU)
1289  *      5. Read/written by CPU
1290  *      6. Read/written by GPU
1291  *
1292  *      1. Allocated
1293  *              Same as last example, (CPU, CPU)
1294  *      2. Mapped to GTT
1295  *              Nothing changes (assertions find that it is not in the GPU)
1296  *      3. Read/written by GPU
1297  *              execbuffer calls set_domain (RENDER, RENDER)
1298  *              flush_domains gets CPU
1299  *              invalidate_domains gets GPU
1300  *              clflush (obj)
1301  *              MI_FLUSH and drm_agp_chipset_flush
1302  *      4. set_domain (CPU, CPU)
1303  *              flush_domains gets GPU
1304  *              invalidate_domains gets CPU
1305  *              wait_rendering (obj) to make sure all drawing is complete.
1306  *              This will include an MI_FLUSH to get the data from GPU
1307  *              to memory
1308  *              clflush (obj) to invalidate the CPU cache
1309  *              Another MI_FLUSH in i915_gem_flush (eliminate this somehow?)
1310  *      5. Read/written by CPU
1311  *              cache lines are loaded and dirtied
1312  *      6. Read written by GPU
1313  *              Same as last GPU access
1314  *
1315  * Case 3: The constant buffer
1316  *
1317  *      1. Allocated
1318  *      2. Written by CPU
1319  *      3. Read by GPU
1320  *      4. Updated (written) by CPU again
1321  *      5. Read by GPU
1322  *
1323  *      1. Allocated
1324  *              (CPU, CPU)
1325  *      2. Written by CPU
1326  *              (CPU, CPU)
1327  *      3. Read by GPU
1328  *              (CPU+RENDER, 0)
1329  *              flush_domains = CPU
1330  *              invalidate_domains = RENDER
1331  *              clflush (obj)
1332  *              MI_FLUSH
1333  *              drm_agp_chipset_flush
1334  *      4. Updated (written) by CPU again
1335  *              (CPU, CPU)
1336  *              flush_domains = 0 (no previous write domain)
1337  *              invalidate_domains = 0 (no new read domains)
1338  *      5. Read by GPU
1339  *              (CPU+RENDER, 0)
1340  *              flush_domains = CPU
1341  *              invalidate_domains = RENDER
1342  *              clflush (obj)
1343  *              MI_FLUSH
1344  *              drm_agp_chipset_flush
1345  */
1346 static int
1347 i915_gem_object_set_domain(struct drm_gem_object *obj,
1348                             uint32_t read_domains,
1349                             uint32_t write_domain)
1350 {
1351         struct drm_device               *dev = obj->dev;
1352         struct drm_i915_gem_object      *obj_priv = obj->driver_private;
1353         uint32_t                        invalidate_domains = 0;
1354         uint32_t                        flush_domains = 0;
1355         int                             ret;
1356
1357 #if WATCH_BUF
1358         DRM_INFO("%s: object %p read %08x -> %08x write %08x -> %08x\n",
1359                  __func__, obj,
1360                  obj->read_domains, read_domains,
1361                  obj->write_domain, write_domain);
1362 #endif
1363         /*
1364          * If the object isn't moving to a new write domain,
1365          * let the object stay in multiple read domains
1366          */
1367         if (write_domain == 0)
1368                 read_domains |= obj->read_domains;
1369         else
1370                 obj_priv->dirty = 1;
1371
1372         /*
1373          * Flush the current write domain if
1374          * the new read domains don't match. Invalidate
1375          * any read domains which differ from the old
1376          * write domain
1377          */
1378         if (obj->write_domain && obj->write_domain != read_domains) {
1379                 flush_domains |= obj->write_domain;
1380                 invalidate_domains |= read_domains & ~obj->write_domain;
1381         }
1382         /*
1383          * Invalidate any read caches which may have
1384          * stale data. That is, any new read domains.
1385          */
1386         invalidate_domains |= read_domains & ~obj->read_domains;
1387         if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_CPU) {
1388 #if WATCH_BUF
1389                 DRM_INFO("%s: CPU domain flush %08x invalidate %08x\n",
1390                          __func__, flush_domains, invalidate_domains);
1391 #endif
1392                 /*
1393                  * If we're invaliding the CPU cache and flushing a GPU cache,
1394                  * then pause for rendering so that the GPU caches will be
1395                  * flushed before the cpu cache is invalidated
1396                  */
1397                 if ((invalidate_domains & I915_GEM_DOMAIN_CPU) &&
1398                     (flush_domains & ~(I915_GEM_DOMAIN_CPU |
1399                                        I915_GEM_DOMAIN_GTT))) {
1400                         ret = i915_gem_object_wait_rendering(obj);
1401                         if (ret)
1402                                 return ret;
1403                 }
1404                 i915_gem_clflush_object(obj);
1405         }
1406
1407         if ((write_domain | flush_domains) != 0)
1408                 obj->write_domain = write_domain;
1409
1410         /* If we're invalidating the CPU domain, clear the per-page CPU
1411          * domain list as well.
1412          */
1413         if (obj_priv->page_cpu_valid != NULL &&
1414             (write_domain != 0 ||
1415              read_domains & I915_GEM_DOMAIN_CPU)) {
1416                 drm_free(obj_priv->page_cpu_valid, obj->size / PAGE_SIZE,
1417                          DRM_MEM_DRIVER);
1418                 obj_priv->page_cpu_valid = NULL;
1419         }
1420         obj->read_domains = read_domains;
1421
1422         dev->invalidate_domains |= invalidate_domains;
1423         dev->flush_domains |= flush_domains;
1424 #if WATCH_BUF
1425         DRM_INFO("%s: read %08x write %08x invalidate %08x flush %08x\n",
1426                  __func__,
1427                  obj->read_domains, obj->write_domain,
1428                  dev->invalidate_domains, dev->flush_domains);
1429 #endif
1430         return 0;
1431 }
1432
1433 /**
1434  * Set the read/write domain on a range of the object.
1435  *
1436  * Currently only implemented for CPU reads, otherwise drops to normal
1437  * i915_gem_object_set_domain().
1438  */
1439 static int
1440 i915_gem_object_set_domain_range(struct drm_gem_object *obj,
1441                                  uint64_t offset,
1442                                  uint64_t size,
1443                                  uint32_t read_domains,
1444                                  uint32_t write_domain)
1445 {
1446         struct drm_i915_gem_object *obj_priv = obj->driver_private;
1447         int ret, i;
1448
1449         if (obj->read_domains & I915_GEM_DOMAIN_CPU)
1450                 return 0;
1451
1452         if (read_domains != I915_GEM_DOMAIN_CPU ||
1453             write_domain != 0)
1454                 return i915_gem_object_set_domain(obj,
1455                                                   read_domains, write_domain);
1456
1457         /* Wait on any GPU rendering to the object to be flushed. */
1458         ret = i915_gem_object_wait_rendering(obj);
1459         if (ret)
1460                 return ret;
1461
1462         if (obj_priv->page_cpu_valid == NULL) {
1463                 obj_priv->page_cpu_valid = drm_calloc(1, obj->size / PAGE_SIZE,
1464                                                       DRM_MEM_DRIVER);
1465         }
1466
1467         /* Flush the cache on any pages that are still invalid from the CPU's
1468          * perspective.
1469          */
1470         for (i = offset / PAGE_SIZE; i <= (offset + size - 1) / PAGE_SIZE; i++) {
1471                 if (obj_priv->page_cpu_valid[i])
1472                         continue;
1473
1474                 drm_clflush_pages(obj_priv->page_list + i, 1);
1475
1476                 obj_priv->page_cpu_valid[i] = 1;
1477         }
1478
1479         return 0;
1480 }
1481
1482 /**
1483  * Once all of the objects have been set in the proper domain,
1484  * perform the necessary flush and invalidate operations.
1485  *
1486  * Returns the write domains flushed, for use in flush tracking.
1487  */
1488 static uint32_t
1489 i915_gem_dev_set_domain(struct drm_device *dev)
1490 {
1491         uint32_t flush_domains = dev->flush_domains;
1492
1493         /*
1494          * Now that all the buffers are synced to the proper domains,
1495          * flush and invalidate the collected domains
1496          */
1497         if (dev->invalidate_domains | dev->flush_domains) {
1498 #if WATCH_EXEC
1499                 DRM_INFO("%s: invalidate_domains %08x flush_domains %08x\n",
1500                           __func__,
1501                          dev->invalidate_domains,
1502                          dev->flush_domains);
1503 #endif
1504                 i915_gem_flush(dev,
1505                                dev->invalidate_domains,
1506                                dev->flush_domains);
1507                 dev->invalidate_domains = 0;
1508                 dev->flush_domains = 0;
1509         }
1510
1511         return flush_domains;
1512 }
1513
1514 /**
1515  * Pin an object to the GTT and evaluate the relocations landing in it.
1516  */
1517 static int
1518 i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
1519                                  struct drm_file *file_priv,
1520                                  struct drm_i915_gem_exec_object *entry)
1521 {
1522         struct drm_device *dev = obj->dev;
1523         drm_i915_private_t *dev_priv = dev->dev_private;
1524         struct drm_i915_gem_relocation_entry reloc;
1525         struct drm_i915_gem_relocation_entry __user *relocs;
1526         struct drm_i915_gem_object *obj_priv = obj->driver_private;
1527         int i, ret;
1528         void __iomem *reloc_page;
1529
1530         /* Choose the GTT offset for our buffer and put it there. */
1531         ret = i915_gem_object_pin(obj, (uint32_t) entry->alignment);
1532         if (ret)
1533                 return ret;
1534
1535         entry->offset = obj_priv->gtt_offset;
1536
1537         relocs = (struct drm_i915_gem_relocation_entry __user *)
1538                  (uintptr_t) entry->relocs_ptr;
1539         /* Apply the relocations, using the GTT aperture to avoid cache
1540          * flushing requirements.
1541          */
1542         for (i = 0; i < entry->relocation_count; i++) {
1543                 struct drm_gem_object *target_obj;
1544                 struct drm_i915_gem_object *target_obj_priv;
1545                 uint32_t reloc_val, reloc_offset;
1546                 uint32_t __iomem *reloc_entry;
1547
1548                 ret = copy_from_user(&reloc, relocs + i, sizeof(reloc));
1549                 if (ret != 0) {
1550                         i915_gem_object_unpin(obj);
1551                         return ret;
1552                 }
1553
1554                 target_obj = drm_gem_object_lookup(obj->dev, file_priv,
1555                                                    reloc.target_handle);
1556                 if (target_obj == NULL) {
1557                         i915_gem_object_unpin(obj);
1558                         return -EBADF;
1559                 }
1560                 target_obj_priv = target_obj->driver_private;
1561
1562                 /* The target buffer should have appeared before us in the
1563                  * exec_object list, so it should have a GTT space bound by now.
1564                  */
1565                 if (target_obj_priv->gtt_space == NULL) {
1566                         DRM_ERROR("No GTT space found for object %d\n",
1567                                   reloc.target_handle);
1568                         drm_gem_object_unreference(target_obj);
1569                         i915_gem_object_unpin(obj);
1570                         return -EINVAL;
1571                 }
1572
1573                 if (reloc.offset > obj->size - 4) {
1574                         DRM_ERROR("Relocation beyond object bounds: "
1575                                   "obj %p target %d offset %d size %d.\n",
1576                                   obj, reloc.target_handle,
1577                                   (int) reloc.offset, (int) obj->size);
1578                         drm_gem_object_unreference(target_obj);
1579                         i915_gem_object_unpin(obj);
1580                         return -EINVAL;
1581                 }
1582                 if (reloc.offset & 3) {
1583                         DRM_ERROR("Relocation not 4-byte aligned: "
1584                                   "obj %p target %d offset %d.\n",
1585                                   obj, reloc.target_handle,
1586                                   (int) reloc.offset);
1587                         drm_gem_object_unreference(target_obj);
1588                         i915_gem_object_unpin(obj);
1589                         return -EINVAL;
1590                 }
1591
1592                 if (reloc.write_domain && target_obj->pending_write_domain &&
1593                     reloc.write_domain != target_obj->pending_write_domain) {
1594                         DRM_ERROR("Write domain conflict: "
1595                                   "obj %p target %d offset %d "
1596                                   "new %08x old %08x\n",
1597                                   obj, reloc.target_handle,
1598                                   (int) reloc.offset,
1599                                   reloc.write_domain,
1600                                   target_obj->pending_write_domain);
1601                         drm_gem_object_unreference(target_obj);
1602                         i915_gem_object_unpin(obj);
1603                         return -EINVAL;
1604                 }
1605
1606 #if WATCH_RELOC
1607                 DRM_INFO("%s: obj %p offset %08x target %d "
1608                          "read %08x write %08x gtt %08x "
1609                          "presumed %08x delta %08x\n",
1610                          __func__,
1611                          obj,
1612                          (int) reloc.offset,
1613                          (int) reloc.target_handle,
1614                          (int) reloc.read_domains,
1615                          (int) reloc.write_domain,
1616                          (int) target_obj_priv->gtt_offset,
1617                          (int) reloc.presumed_offset,
1618                          reloc.delta);
1619 #endif
1620
1621                 target_obj->pending_read_domains |= reloc.read_domains;
1622                 target_obj->pending_write_domain |= reloc.write_domain;
1623
1624                 /* If the relocation already has the right value in it, no
1625                  * more work needs to be done.
1626                  */
1627                 if (target_obj_priv->gtt_offset == reloc.presumed_offset) {
1628                         drm_gem_object_unreference(target_obj);
1629                         continue;
1630                 }
1631
1632                 /* Now that we're going to actually write some data in,
1633                  * make sure that any rendering using this buffer's contents
1634                  * is completed.
1635                  */
1636                 i915_gem_object_wait_rendering(obj);
1637
1638                 /* As we're writing through the gtt, flush
1639                  * any CPU writes before we write the relocations
1640                  */
1641                 if (obj->write_domain & I915_GEM_DOMAIN_CPU) {
1642                         i915_gem_clflush_object(obj);
1643                         drm_agp_chipset_flush(dev);
1644                         obj->write_domain = 0;
1645                 }
1646
1647                 /* Map the page containing the relocation we're going to
1648                  * perform.
1649                  */
1650                 reloc_offset = obj_priv->gtt_offset + reloc.offset;
1651                 reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
1652                                                       (reloc_offset &
1653                                                        ~(PAGE_SIZE - 1)));
1654                 reloc_entry = (uint32_t __iomem *)(reloc_page +
1655                                                    (reloc_offset & (PAGE_SIZE - 1)));
1656                 reloc_val = target_obj_priv->gtt_offset + reloc.delta;
1657
1658 #if WATCH_BUF
1659                 DRM_INFO("Applied relocation: %p@0x%08x %08x -> %08x\n",
1660                           obj, (unsigned int) reloc.offset,
1661                           readl(reloc_entry), reloc_val);
1662 #endif
1663                 writel(reloc_val, reloc_entry);
1664                 io_mapping_unmap_atomic(reloc_page);
1665
1666                 /* Write the updated presumed offset for this entry back out
1667                  * to the user.
1668                  */
1669                 reloc.presumed_offset = target_obj_priv->gtt_offset;
1670                 ret = copy_to_user(relocs + i, &reloc, sizeof(reloc));
1671                 if (ret != 0) {
1672                         drm_gem_object_unreference(target_obj);
1673                         i915_gem_object_unpin(obj);
1674                         return ret;
1675                 }
1676
1677                 drm_gem_object_unreference(target_obj);
1678         }
1679
1680 #if WATCH_BUF
1681         if (0)
1682                 i915_gem_dump_object(obj, 128, __func__, ~0);
1683 #endif
1684         return 0;
1685 }
1686
1687 /** Dispatch a batchbuffer to the ring
1688  */
1689 static int
1690 i915_dispatch_gem_execbuffer(struct drm_device *dev,
1691                               struct drm_i915_gem_execbuffer *exec,
1692                               uint64_t exec_offset)
1693 {
1694         drm_i915_private_t *dev_priv = dev->dev_private;
1695         struct drm_clip_rect __user *boxes = (struct drm_clip_rect __user *)
1696                                              (uintptr_t) exec->cliprects_ptr;
1697         int nbox = exec->num_cliprects;
1698         int i = 0, count;
1699         uint32_t        exec_start, exec_len;
1700         RING_LOCALS;
1701
1702         exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
1703         exec_len = (uint32_t) exec->batch_len;
1704
1705         if ((exec_start | exec_len) & 0x7) {
1706                 DRM_ERROR("alignment\n");
1707                 return -EINVAL;
1708         }
1709
1710         if (!exec_start)
1711                 return -EINVAL;
1712
1713         count = nbox ? nbox : 1;
1714
1715         for (i = 0; i < count; i++) {
1716                 if (i < nbox) {
1717                         int ret = i915_emit_box(dev, boxes, i,
1718                                                 exec->DR1, exec->DR4);
1719                         if (ret)
1720                                 return ret;
1721                 }
1722
1723                 if (IS_I830(dev) || IS_845G(dev)) {
1724                         BEGIN_LP_RING(4);
1725                         OUT_RING(MI_BATCH_BUFFER);
1726                         OUT_RING(exec_start | MI_BATCH_NON_SECURE);
1727                         OUT_RING(exec_start + exec_len - 4);
1728                         OUT_RING(0);
1729                         ADVANCE_LP_RING();
1730                 } else {
1731                         BEGIN_LP_RING(2);
1732                         if (IS_I965G(dev)) {
1733                                 OUT_RING(MI_BATCH_BUFFER_START |
1734                                          (2 << 6) |
1735                                          MI_BATCH_NON_SECURE_I965);
1736                                 OUT_RING(exec_start);
1737                         } else {
1738                                 OUT_RING(MI_BATCH_BUFFER_START |
1739                                          (2 << 6));
1740                                 OUT_RING(exec_start | MI_BATCH_NON_SECURE);
1741                         }
1742                         ADVANCE_LP_RING();
1743                 }
1744         }
1745
1746         /* XXX breadcrumb */
1747         return 0;
1748 }
1749
1750 /* Throttle our rendering by waiting until the ring has completed our requests
1751  * emitted over 20 msec ago.
1752  *
1753  * This should get us reasonable parallelism between CPU and GPU but also
1754  * relatively low latency when blocking on a particular request to finish.
1755  */
1756 static int
1757 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file_priv)
1758 {
1759         struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
1760         int ret = 0;
1761         uint32_t seqno;
1762
1763         mutex_lock(&dev->struct_mutex);
1764         seqno = i915_file_priv->mm.last_gem_throttle_seqno;
1765         i915_file_priv->mm.last_gem_throttle_seqno =
1766                 i915_file_priv->mm.last_gem_seqno;
1767         if (seqno)
1768                 ret = i915_wait_request(dev, seqno);
1769         mutex_unlock(&dev->struct_mutex);
1770         return ret;
1771 }
1772
1773 int
1774 i915_gem_execbuffer(struct drm_device *dev, void *data,
1775                     struct drm_file *file_priv)
1776 {
1777         drm_i915_private_t *dev_priv = dev->dev_private;
1778         struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
1779         struct drm_i915_gem_execbuffer *args = data;
1780         struct drm_i915_gem_exec_object *exec_list = NULL;
1781         struct drm_gem_object **object_list = NULL;
1782         struct drm_gem_object *batch_obj;
1783         int ret, i, pinned = 0;
1784         uint64_t exec_offset;
1785         uint32_t seqno, flush_domains;
1786
1787 #if WATCH_EXEC
1788         DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
1789                   (int) args->buffers_ptr, args->buffer_count, args->batch_len);
1790 #endif
1791
1792         if (args->buffer_count < 1) {
1793                 DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
1794                 return -EINVAL;
1795         }
1796         /* Copy in the exec list from userland */
1797         exec_list = drm_calloc(sizeof(*exec_list), args->buffer_count,
1798                                DRM_MEM_DRIVER);
1799         object_list = drm_calloc(sizeof(*object_list), args->buffer_count,
1800                                  DRM_MEM_DRIVER);
1801         if (exec_list == NULL || object_list == NULL) {
1802                 DRM_ERROR("Failed to allocate exec or object list "
1803                           "for %d buffers\n",
1804                           args->buffer_count);
1805                 ret = -ENOMEM;
1806                 goto pre_mutex_err;
1807         }
1808         ret = copy_from_user(exec_list,
1809                              (struct drm_i915_relocation_entry __user *)
1810                              (uintptr_t) args->buffers_ptr,
1811                              sizeof(*exec_list) * args->buffer_count);
1812         if (ret != 0) {
1813                 DRM_ERROR("copy %d exec entries failed %d\n",
1814                           args->buffer_count, ret);
1815                 goto pre_mutex_err;
1816         }
1817
1818         mutex_lock(&dev->struct_mutex);
1819
1820         i915_verify_inactive(dev, __FILE__, __LINE__);
1821
1822         if (dev_priv->mm.wedged) {
1823                 DRM_ERROR("Execbuf while wedged\n");
1824                 mutex_unlock(&dev->struct_mutex);
1825                 return -EIO;
1826         }
1827
1828         if (dev_priv->mm.suspended) {
1829                 DRM_ERROR("Execbuf while VT-switched.\n");
1830                 mutex_unlock(&dev->struct_mutex);
1831                 return -EBUSY;
1832         }
1833
1834         /* Zero the gloabl flush/invalidate flags. These
1835          * will be modified as each object is bound to the
1836          * gtt
1837          */
1838         dev->invalidate_domains = 0;
1839         dev->flush_domains = 0;
1840
1841         /* Look up object handles and perform the relocations */
1842         for (i = 0; i < args->buffer_count; i++) {
1843                 object_list[i] = drm_gem_object_lookup(dev, file_priv,
1844                                                        exec_list[i].handle);
1845                 if (object_list[i] == NULL) {
1846                         DRM_ERROR("Invalid object handle %d at index %d\n",
1847                                    exec_list[i].handle, i);
1848                         ret = -EBADF;
1849                         goto err;
1850                 }
1851
1852                 object_list[i]->pending_read_domains = 0;
1853                 object_list[i]->pending_write_domain = 0;
1854                 ret = i915_gem_object_pin_and_relocate(object_list[i],
1855                                                        file_priv,
1856                                                        &exec_list[i]);
1857                 if (ret) {
1858                         DRM_ERROR("object bind and relocate failed %d\n", ret);
1859                         goto err;
1860                 }
1861                 pinned = i + 1;
1862         }
1863
1864         /* Set the pending read domains for the batch buffer to COMMAND */
1865         batch_obj = object_list[args->buffer_count-1];
1866         batch_obj->pending_read_domains = I915_GEM_DOMAIN_COMMAND;
1867         batch_obj->pending_write_domain = 0;
1868
1869         i915_verify_inactive(dev, __FILE__, __LINE__);
1870
1871         for (i = 0; i < args->buffer_count; i++) {
1872                 struct drm_gem_object *obj = object_list[i];
1873                 struct drm_i915_gem_object *obj_priv = obj->driver_private;
1874
1875                 if (obj_priv->gtt_space == NULL) {
1876                         /* We evicted the buffer in the process of validating
1877                          * our set of buffers in.  We could try to recover by
1878                          * kicking them everything out and trying again from
1879                          * the start.
1880                          */
1881                         ret = -ENOMEM;
1882                         goto err;
1883                 }
1884
1885                 /* make sure all previous memory operations have passed */
1886                 ret = i915_gem_object_set_domain(obj,
1887                                                  obj->pending_read_domains,
1888                                                  obj->pending_write_domain);
1889                 if (ret)
1890                         goto err;
1891         }
1892
1893         i915_verify_inactive(dev, __FILE__, __LINE__);
1894
1895         /* Flush/invalidate caches and chipset buffer */
1896         flush_domains = i915_gem_dev_set_domain(dev);
1897
1898         i915_verify_inactive(dev, __FILE__, __LINE__);
1899
1900 #if WATCH_COHERENCY
1901         for (i = 0; i < args->buffer_count; i++) {
1902                 i915_gem_object_check_coherency(object_list[i],
1903                                                 exec_list[i].handle);
1904         }
1905 #endif
1906
1907         exec_offset = exec_list[args->buffer_count - 1].offset;
1908
1909 #if WATCH_EXEC
1910         i915_gem_dump_object(object_list[args->buffer_count - 1],
1911                               args->batch_len,
1912                               __func__,
1913                               ~0);
1914 #endif
1915
1916         (void)i915_add_request(dev, flush_domains);
1917
1918         /* Exec the batchbuffer */
1919         ret = i915_dispatch_gem_execbuffer(dev, args, exec_offset);
1920         if (ret) {
1921                 DRM_ERROR("dispatch failed %d\n", ret);
1922                 goto err;
1923         }
1924
1925         /*
1926          * Ensure that the commands in the batch buffer are
1927          * finished before the interrupt fires
1928          */
1929         flush_domains = i915_retire_commands(dev);
1930
1931         i915_verify_inactive(dev, __FILE__, __LINE__);
1932
1933         /*
1934          * Get a seqno representing the execution of the current buffer,
1935          * which we can wait on.  We would like to mitigate these interrupts,
1936          * likely by only creating seqnos occasionally (so that we have
1937          * *some* interrupts representing completion of buffers that we can
1938          * wait on when trying to clear up gtt space).
1939          */
1940         seqno = i915_add_request(dev, flush_domains);
1941         BUG_ON(seqno == 0);
1942         i915_file_priv->mm.last_gem_seqno = seqno;
1943         for (i = 0; i < args->buffer_count; i++) {
1944                 struct drm_gem_object *obj = object_list[i];
1945                 struct drm_i915_gem_object *obj_priv = obj->driver_private;
1946
1947                 i915_gem_object_move_to_active(obj);
1948                 obj_priv->last_rendering_seqno = seqno;
1949 #if WATCH_LRU
1950                 DRM_INFO("%s: move to exec list %p\n", __func__, obj);
1951 #endif
1952         }
1953 #if WATCH_LRU
1954         i915_dump_lru(dev, __func__);
1955 #endif
1956
1957         i915_verify_inactive(dev, __FILE__, __LINE__);
1958
1959         /* Copy the new buffer offsets back to the user's exec list. */
1960         ret = copy_to_user((struct drm_i915_relocation_entry __user *)
1961                            (uintptr_t) args->buffers_ptr,
1962                            exec_list,
1963                            sizeof(*exec_list) * args->buffer_count);
1964         if (ret)
1965                 DRM_ERROR("failed to copy %d exec entries "
1966                           "back to user (%d)\n",
1967                            args->buffer_count, ret);
1968 err:
1969         if (object_list != NULL) {
1970                 for (i = 0; i < pinned; i++)
1971                         i915_gem_object_unpin(object_list[i]);
1972
1973                 for (i = 0; i < args->buffer_count; i++)
1974                         drm_gem_object_unreference(object_list[i]);
1975         }
1976         mutex_unlock(&dev->struct_mutex);
1977
1978 pre_mutex_err:
1979         drm_free(object_list, sizeof(*object_list) * args->buffer_count,
1980                  DRM_MEM_DRIVER);
1981         drm_free(exec_list, sizeof(*exec_list) * args->buffer_count,
1982                  DRM_MEM_DRIVER);
1983
1984         return ret;
1985 }
1986
1987 int
1988 i915_gem_object_pin(struct drm_gem_object *obj, uint32_t alignment)
1989 {
1990         struct drm_device *dev = obj->dev;
1991         struct drm_i915_gem_object *obj_priv = obj->driver_private;
1992         int ret;
1993
1994         i915_verify_inactive(dev, __FILE__, __LINE__);
1995         if (obj_priv->gtt_space == NULL) {
1996                 ret = i915_gem_object_bind_to_gtt(obj, alignment);
1997                 if (ret != 0) {
1998                         DRM_ERROR("Failure to bind: %d", ret);
1999                         return ret;
2000                 }
2001         }
2002         obj_priv->pin_count++;
2003
2004         /* If the object is not active and not pending a flush,
2005          * remove it from the inactive list
2006          */
2007         if (obj_priv->pin_count == 1) {
2008                 atomic_inc(&dev->pin_count);
2009                 atomic_add(obj->size, &dev->pin_memory);
2010                 if (!obj_priv->active &&
2011                     (obj->write_domain & ~(I915_GEM_DOMAIN_CPU |
2012                                            I915_GEM_DOMAIN_GTT)) == 0 &&
2013                     !list_empty(&obj_priv->list))
2014                         list_del_init(&obj_priv->list);
2015         }
2016         i915_verify_inactive(dev, __FILE__, __LINE__);
2017
2018         return 0;
2019 }
2020
2021 void
2022 i915_gem_object_unpin(struct drm_gem_object *obj)
2023 {
2024         struct drm_device *dev = obj->dev;
2025         drm_i915_private_t *dev_priv = dev->dev_private;
2026         struct drm_i915_gem_object *obj_priv = obj->driver_private;
2027
2028         i915_verify_inactive(dev, __FILE__, __LINE__);
2029         obj_priv->pin_count--;
2030         BUG_ON(obj_priv->pin_count < 0);
2031         BUG_ON(obj_priv->gtt_space == NULL);
2032
2033         /* If the object is no longer pinned, and is
2034          * neither active nor being flushed, then stick it on
2035          * the inactive list
2036          */
2037         if (obj_priv->pin_count == 0) {
2038                 if (!obj_priv->active &&
2039                     (obj->write_domain & ~(I915_GEM_DOMAIN_CPU |
2040                                            I915_GEM_DOMAIN_GTT)) == 0)
2041                         list_move_tail(&obj_priv->list,
2042                                        &dev_priv->mm.inactive_list);
2043                 atomic_dec(&dev->pin_count);
2044                 atomic_sub(obj->size, &dev->pin_memory);
2045         }
2046         i915_verify_inactive(dev, __FILE__, __LINE__);
2047 }
2048
2049 int
2050 i915_gem_pin_ioctl(struct drm_device *dev, void *data,
2051                    struct drm_file *file_priv)
2052 {
2053         struct drm_i915_gem_pin *args = data;
2054         struct drm_gem_object *obj;
2055         struct drm_i915_gem_object *obj_priv;
2056         int ret;
2057
2058         mutex_lock(&dev->struct_mutex);
2059
2060         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
2061         if (obj == NULL) {
2062                 DRM_ERROR("Bad handle in i915_gem_pin_ioctl(): %d\n",
2063                           args->handle);
2064                 mutex_unlock(&dev->struct_mutex);
2065                 return -EBADF;
2066         }
2067         obj_priv = obj->driver_private;
2068
2069         ret = i915_gem_object_pin(obj, args->alignment);
2070         if (ret != 0) {
2071                 drm_gem_object_unreference(obj);
2072                 mutex_unlock(&dev->struct_mutex);
2073                 return ret;
2074         }
2075
2076         /* XXX - flush the CPU caches for pinned objects
2077          * as the X server doesn't manage domains yet
2078          */
2079         if (obj->write_domain & I915_GEM_DOMAIN_CPU) {
2080                 i915_gem_clflush_object(obj);
2081                 drm_agp_chipset_flush(dev);
2082                 obj->write_domain = 0;
2083         }
2084         args->offset = obj_priv->gtt_offset;
2085         drm_gem_object_unreference(obj);
2086         mutex_unlock(&dev->struct_mutex);
2087
2088         return 0;
2089 }
2090
2091 int
2092 i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
2093                      struct drm_file *file_priv)
2094 {
2095         struct drm_i915_gem_pin *args = data;
2096         struct drm_gem_object *obj;
2097
2098         mutex_lock(&dev->struct_mutex);
2099
2100         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
2101         if (obj == NULL) {
2102                 DRM_ERROR("Bad handle in i915_gem_unpin_ioctl(): %d\n",
2103                           args->handle);
2104                 mutex_unlock(&dev->struct_mutex);
2105                 return -EBADF;
2106         }
2107
2108         i915_gem_object_unpin(obj);
2109
2110         drm_gem_object_unreference(obj);
2111         mutex_unlock(&dev->struct_mutex);
2112         return 0;
2113 }
2114
2115 int
2116 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
2117                     struct drm_file *file_priv)
2118 {
2119         struct drm_i915_gem_busy *args = data;
2120         struct drm_gem_object *obj;
2121         struct drm_i915_gem_object *obj_priv;
2122
2123         mutex_lock(&dev->struct_mutex);
2124         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
2125         if (obj == NULL) {
2126                 DRM_ERROR("Bad handle in i915_gem_busy_ioctl(): %d\n",
2127                           args->handle);
2128                 mutex_unlock(&dev->struct_mutex);
2129                 return -EBADF;
2130         }
2131
2132         obj_priv = obj->driver_private;
2133         args->busy = obj_priv->active;
2134
2135         drm_gem_object_unreference(obj);
2136         mutex_unlock(&dev->struct_mutex);
2137         return 0;
2138 }
2139
2140 int
2141 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
2142                         struct drm_file *file_priv)
2143 {
2144     return i915_gem_ring_throttle(dev, file_priv);
2145 }
2146
2147 int i915_gem_init_object(struct drm_gem_object *obj)
2148 {
2149         struct drm_i915_gem_object *obj_priv;
2150
2151         obj_priv = drm_calloc(1, sizeof(*obj_priv), DRM_MEM_DRIVER);
2152         if (obj_priv == NULL)
2153                 return -ENOMEM;
2154
2155         /*
2156          * We've just allocated pages from the kernel,
2157          * so they've just been written by the CPU with
2158          * zeros. They'll need to be clflushed before we
2159          * use them with the GPU.
2160          */
2161         obj->write_domain = I915_GEM_DOMAIN_CPU;
2162         obj->read_domains = I915_GEM_DOMAIN_CPU;
2163
2164         obj_priv->agp_type = AGP_USER_MEMORY;
2165
2166         obj->driver_private = obj_priv;
2167         obj_priv->obj = obj;
2168         INIT_LIST_HEAD(&obj_priv->list);
2169         return 0;
2170 }
2171
2172 void i915_gem_free_object(struct drm_gem_object *obj)
2173 {
2174         struct drm_i915_gem_object *obj_priv = obj->driver_private;
2175
2176         while (obj_priv->pin_count > 0)
2177                 i915_gem_object_unpin(obj);
2178
2179         i915_gem_object_unbind(obj);
2180
2181         drm_free(obj_priv->page_cpu_valid, 1, DRM_MEM_DRIVER);
2182         drm_free(obj->driver_private, 1, DRM_MEM_DRIVER);
2183 }
2184
2185 static int
2186 i915_gem_set_domain(struct drm_gem_object *obj,
2187                     struct drm_file *file_priv,
2188                     uint32_t read_domains,
2189                     uint32_t write_domain)
2190 {
2191         struct drm_device *dev = obj->dev;
2192         int ret;
2193         uint32_t flush_domains;
2194
2195         BUG_ON(!mutex_is_locked(&dev->struct_mutex));
2196
2197         ret = i915_gem_object_set_domain(obj, read_domains, write_domain);
2198         if (ret)
2199                 return ret;
2200         flush_domains = i915_gem_dev_set_domain(obj->dev);
2201
2202         if (flush_domains & ~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT))
2203                 (void) i915_add_request(dev, flush_domains);
2204
2205         return 0;
2206 }
2207
2208 /** Unbinds all objects that are on the given buffer list. */
2209 static int
2210 i915_gem_evict_from_list(struct drm_device *dev, struct list_head *head)
2211 {
2212         struct drm_gem_object *obj;
2213         struct drm_i915_gem_object *obj_priv;
2214         int ret;
2215
2216         while (!list_empty(head)) {
2217                 obj_priv = list_first_entry(head,
2218                                             struct drm_i915_gem_object,
2219                                             list);
2220                 obj = obj_priv->obj;
2221
2222                 if (obj_priv->pin_count != 0) {
2223                         DRM_ERROR("Pinned object in unbind list\n");
2224                         mutex_unlock(&dev->struct_mutex);
2225                         return -EINVAL;
2226                 }
2227
2228                 ret = i915_gem_object_unbind(obj);
2229                 if (ret != 0) {
2230                         DRM_ERROR("Error unbinding object in LeaveVT: %d\n",
2231                                   ret);
2232                         mutex_unlock(&dev->struct_mutex);
2233                         return ret;
2234                 }
2235         }
2236
2237
2238         return 0;
2239 }
2240
2241 static int
2242 i915_gem_idle(struct drm_device *dev)
2243 {
2244         drm_i915_private_t *dev_priv = dev->dev_private;
2245         uint32_t seqno, cur_seqno, last_seqno;
2246         int stuck, ret;
2247
2248         mutex_lock(&dev->struct_mutex);
2249
2250         if (dev_priv->mm.suspended || dev_priv->ring.ring_obj == NULL) {
2251                 mutex_unlock(&dev->struct_mutex);
2252                 return 0;
2253         }
2254
2255         /* Hack!  Don't let anybody do execbuf while we don't control the chip.
2256          * We need to replace this with a semaphore, or something.
2257          */
2258         dev_priv->mm.suspended = 1;
2259
2260         /* Cancel the retire work handler, wait for it to finish if running
2261          */
2262         mutex_unlock(&dev->struct_mutex);
2263         cancel_delayed_work_sync(&dev_priv->mm.retire_work);
2264         mutex_lock(&dev->struct_mutex);
2265
2266         i915_kernel_lost_context(dev);
2267
2268         /* Flush the GPU along with all non-CPU write domains
2269          */
2270         i915_gem_flush(dev, ~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT),
2271                        ~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT));
2272         seqno = i915_add_request(dev, ~(I915_GEM_DOMAIN_CPU |
2273                                         I915_GEM_DOMAIN_GTT));
2274
2275         if (seqno == 0) {
2276                 mutex_unlock(&dev->struct_mutex);
2277                 return -ENOMEM;
2278         }
2279
2280         dev_priv->mm.waiting_gem_seqno = seqno;
2281         last_seqno = 0;
2282         stuck = 0;
2283         for (;;) {
2284                 cur_seqno = i915_get_gem_seqno(dev);
2285                 if (i915_seqno_passed(cur_seqno, seqno))
2286                         break;
2287                 if (last_seqno == cur_seqno) {
2288                         if (stuck++ > 100) {
2289                                 DRM_ERROR("hardware wedged\n");
2290                                 dev_priv->mm.wedged = 1;
2291                                 DRM_WAKEUP(&dev_priv->irq_queue);
2292                                 break;
2293                         }
2294                 }
2295                 msleep(10);
2296                 last_seqno = cur_seqno;
2297         }
2298         dev_priv->mm.waiting_gem_seqno = 0;
2299
2300         i915_gem_retire_requests(dev);
2301
2302         /* Active and flushing should now be empty as we've
2303          * waited for a sequence higher than any pending execbuffer
2304          */
2305         BUG_ON(!list_empty(&dev_priv->mm.active_list));
2306         BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
2307
2308         /* Request should now be empty as we've also waited
2309          * for the last request in the list
2310          */
2311         BUG_ON(!list_empty(&dev_priv->mm.request_list));
2312
2313         /* Move all buffers out of the GTT. */
2314         ret = i915_gem_evict_from_list(dev, &dev_priv->mm.inactive_list);
2315         if (ret) {
2316                 mutex_unlock(&dev->struct_mutex);
2317                 return ret;
2318         }
2319
2320         BUG_ON(!list_empty(&dev_priv->mm.active_list));
2321         BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
2322         BUG_ON(!list_empty(&dev_priv->mm.inactive_list));
2323         BUG_ON(!list_empty(&dev_priv->mm.request_list));
2324
2325         i915_gem_cleanup_ringbuffer(dev);
2326         mutex_unlock(&dev->struct_mutex);
2327
2328         return 0;
2329 }
2330
2331 static int
2332 i915_gem_init_hws(struct drm_device *dev)
2333 {
2334         drm_i915_private_t *dev_priv = dev->dev_private;
2335         struct drm_gem_object *obj;
2336         struct drm_i915_gem_object *obj_priv;
2337         int ret;
2338
2339         /* If we need a physical address for the status page, it's already
2340          * initialized at driver load time.
2341          */
2342         if (!I915_NEED_GFX_HWS(dev))
2343                 return 0;
2344
2345         obj = drm_gem_object_alloc(dev, 4096);
2346         if (obj == NULL) {
2347                 DRM_ERROR("Failed to allocate status page\n");
2348                 return -ENOMEM;
2349         }
2350         obj_priv = obj->driver_private;
2351         obj_priv->agp_type = AGP_USER_CACHED_MEMORY;
2352
2353         ret = i915_gem_object_pin(obj, 4096);
2354         if (ret != 0) {
2355                 drm_gem_object_unreference(obj);
2356                 return ret;
2357         }
2358
2359         dev_priv->status_gfx_addr = obj_priv->gtt_offset;
2360
2361         dev_priv->hw_status_page = kmap(obj_priv->page_list[0]);
2362         if (dev_priv->hw_status_page == NULL) {
2363                 DRM_ERROR("Failed to map status page.\n");
2364                 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
2365                 drm_gem_object_unreference(obj);
2366                 return -EINVAL;
2367         }
2368         dev_priv->hws_obj = obj;
2369         memset(dev_priv->hw_status_page, 0, PAGE_SIZE);
2370         I915_WRITE(HWS_PGA, dev_priv->status_gfx_addr);
2371         I915_READ(HWS_PGA); /* posting read */
2372         DRM_DEBUG("hws offset: 0x%08x\n", dev_priv->status_gfx_addr);
2373
2374         return 0;
2375 }
2376
2377 static int
2378 i915_gem_init_ringbuffer(struct drm_device *dev)
2379 {
2380         drm_i915_private_t *dev_priv = dev->dev_private;
2381         struct drm_gem_object *obj;
2382         struct drm_i915_gem_object *obj_priv;
2383         int ret;
2384         u32 head;
2385
2386         ret = i915_gem_init_hws(dev);
2387         if (ret != 0)
2388                 return ret;
2389
2390         obj = drm_gem_object_alloc(dev, 128 * 1024);
2391         if (obj == NULL) {
2392                 DRM_ERROR("Failed to allocate ringbuffer\n");
2393                 return -ENOMEM;
2394         }
2395         obj_priv = obj->driver_private;
2396
2397         ret = i915_gem_object_pin(obj, 4096);
2398         if (ret != 0) {
2399                 drm_gem_object_unreference(obj);
2400                 return ret;
2401         }
2402
2403         /* Set up the kernel mapping for the ring. */
2404         dev_priv->ring.Size = obj->size;
2405         dev_priv->ring.tail_mask = obj->size - 1;
2406
2407         dev_priv->ring.map.offset = dev->agp->base + obj_priv->gtt_offset;
2408         dev_priv->ring.map.size = obj->size;
2409         dev_priv->ring.map.type = 0;
2410         dev_priv->ring.map.flags = 0;
2411         dev_priv->ring.map.mtrr = 0;
2412
2413         drm_core_ioremap_wc(&dev_priv->ring.map, dev);
2414         if (dev_priv->ring.map.handle == NULL) {
2415                 DRM_ERROR("Failed to map ringbuffer.\n");
2416                 memset(&dev_priv->ring, 0, sizeof(dev_priv->ring));
2417                 drm_gem_object_unreference(obj);
2418                 return -EINVAL;
2419         }
2420         dev_priv->ring.ring_obj = obj;
2421         dev_priv->ring.virtual_start = dev_priv->ring.map.handle;
2422
2423         /* Stop the ring if it's running. */
2424         I915_WRITE(PRB0_CTL, 0);
2425         I915_WRITE(PRB0_TAIL, 0);
2426         I915_WRITE(PRB0_HEAD, 0);
2427
2428         /* Initialize the ring. */
2429         I915_WRITE(PRB0_START, obj_priv->gtt_offset);
2430         head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
2431
2432         /* G45 ring initialization fails to reset head to zero */
2433         if (head != 0) {
2434                 DRM_ERROR("Ring head not reset to zero "
2435                           "ctl %08x head %08x tail %08x start %08x\n",
2436                           I915_READ(PRB0_CTL),
2437                           I915_READ(PRB0_HEAD),
2438                           I915_READ(PRB0_TAIL),
2439                           I915_READ(PRB0_START));
2440                 I915_WRITE(PRB0_HEAD, 0);
2441
2442                 DRM_ERROR("Ring head forced to zero "
2443                           "ctl %08x head %08x tail %08x start %08x\n",
2444                           I915_READ(PRB0_CTL),
2445                           I915_READ(PRB0_HEAD),
2446                           I915_READ(PRB0_TAIL),
2447                           I915_READ(PRB0_START));
2448         }
2449
2450         I915_WRITE(PRB0_CTL,
2451                    ((obj->size - 4096) & RING_NR_PAGES) |
2452                    RING_NO_REPORT |
2453                    RING_VALID);
2454
2455         head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
2456
2457         /* If the head is still not zero, the ring is dead */
2458         if (head != 0) {
2459                 DRM_ERROR("Ring initialization failed "
2460                           "ctl %08x head %08x tail %08x start %08x\n",
2461                           I915_READ(PRB0_CTL),
2462                           I915_READ(PRB0_HEAD),
2463                           I915_READ(PRB0_TAIL),
2464                           I915_READ(PRB0_START));
2465                 return -EIO;
2466         }
2467
2468         /* Update our cache of the ring state */
2469         i915_kernel_lost_context(dev);
2470
2471         return 0;
2472 }
2473
2474 static void
2475 i915_gem_cleanup_ringbuffer(struct drm_device *dev)
2476 {
2477         drm_i915_private_t *dev_priv = dev->dev_private;
2478
2479         if (dev_priv->ring.ring_obj == NULL)
2480                 return;
2481
2482         drm_core_ioremapfree(&dev_priv->ring.map, dev);
2483
2484         i915_gem_object_unpin(dev_priv->ring.ring_obj);
2485         drm_gem_object_unreference(dev_priv->ring.ring_obj);
2486         dev_priv->ring.ring_obj = NULL;
2487         memset(&dev_priv->ring, 0, sizeof(dev_priv->ring));
2488
2489         if (dev_priv->hws_obj != NULL) {
2490                 struct drm_gem_object *obj = dev_priv->hws_obj;
2491                 struct drm_i915_gem_object *obj_priv = obj->driver_private;
2492
2493                 kunmap(obj_priv->page_list[0]);
2494                 i915_gem_object_unpin(obj);
2495                 drm_gem_object_unreference(obj);
2496                 dev_priv->hws_obj = NULL;
2497                 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
2498                 dev_priv->hw_status_page = NULL;
2499
2500                 /* Write high address into HWS_PGA when disabling. */
2501                 I915_WRITE(HWS_PGA, 0x1ffff000);
2502         }
2503 }
2504
2505 int
2506 i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
2507                        struct drm_file *file_priv)
2508 {
2509         drm_i915_private_t *dev_priv = dev->dev_private;
2510         int ret;
2511
2512         if (dev_priv->mm.wedged) {
2513                 DRM_ERROR("Reenabling wedged hardware, good luck\n");
2514                 dev_priv->mm.wedged = 0;
2515         }
2516
2517         ret = i915_gem_init_ringbuffer(dev);
2518         if (ret != 0)
2519                 return ret;
2520
2521         dev_priv->mm.gtt_mapping = io_mapping_create_wc(dev->agp->base,
2522                                                         dev->agp->agp_info.aper_size
2523                                                         * 1024 * 1024);
2524
2525         mutex_lock(&dev->struct_mutex);
2526         BUG_ON(!list_empty(&dev_priv->mm.active_list));
2527         BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
2528         BUG_ON(!list_empty(&dev_priv->mm.inactive_list));
2529         BUG_ON(!list_empty(&dev_priv->mm.request_list));
2530         dev_priv->mm.suspended = 0;
2531         mutex_unlock(&dev->struct_mutex);
2532
2533         drm_irq_install(dev);
2534
2535         return 0;
2536 }
2537
2538 int
2539 i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
2540                        struct drm_file *file_priv)
2541 {
2542         drm_i915_private_t *dev_priv = dev->dev_private;
2543         int ret;
2544
2545         ret = i915_gem_idle(dev);
2546         drm_irq_uninstall(dev);
2547
2548         io_mapping_free(dev_priv->mm.gtt_mapping);
2549         return ret;
2550 }
2551
2552 void
2553 i915_gem_lastclose(struct drm_device *dev)
2554 {
2555         int ret;
2556
2557         ret = i915_gem_idle(dev);
2558         if (ret)
2559                 DRM_ERROR("failed to idle hardware: %d\n", ret);
2560 }
2561
2562 void
2563 i915_gem_load(struct drm_device *dev)
2564 {
2565         drm_i915_private_t *dev_priv = dev->dev_private;
2566
2567         INIT_LIST_HEAD(&dev_priv->mm.active_list);
2568         INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
2569         INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
2570         INIT_LIST_HEAD(&dev_priv->mm.request_list);
2571         INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
2572                           i915_gem_retire_work_handler);
2573         dev_priv->mm.next_gem_seqno = 1;
2574
2575         i915_gem_detect_bit_6_swizzle(dev);
2576 }