sys/dev/drm2/i915/i915_gem_execbuffer.c

   1 /*
   2  * Copyright © 2008,2010 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  *    Chris Wilson <chris@chris-wilson.co.uk>
  26  *
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <dev/drm2/drmP.h>
  33 #include <dev/drm2/drm.h>
  34 #include <dev/drm2/i915/i915_drm.h>
  35 #include <dev/drm2/i915/i915_drv.h>
  36 #include <dev/drm2/i915/intel_drv.h>
  37 #include <sys/limits.h>
  38 #include <sys/sf_buf.h>
  39
  40 struct change_domains {
  41         uint32_t invalidate_domains;
  42         uint32_t flush_domains;
  43         uint32_t flush_rings;
  44         uint32_t flips;
  45 };
  46
  47 /*
  48  * Set the next domain for the specified object. This
  49  * may not actually perform the necessary flushing/invaliding though,
  50  * as that may want to be batched with other set_domain operations
  51  *
  52  * This is (we hope) the only really tricky part of gem. The goal
  53  * is fairly simple -- track which caches hold bits of the object
  54  * and make sure they remain coherent. A few concrete examples may
  55  * help to explain how it works. For shorthand, we use the notation
  56  * (read_domains, write_domain), e.g. (CPU, CPU) to indicate the
  57  * a pair of read and write domain masks.
  58  *
  59  * Case 1: the batch buffer
  60  *
  61  *      1. Allocated
  62  *      2. Written by CPU
  63  *      3. Mapped to GTT
  64  *      4. Read by GPU
  65  *      5. Unmapped from GTT
  66  *      6. Freed
  67  *
  68  *      Let's take these a step at a time
  69  *
  70  *      1. Allocated
  71  *              Pages allocated from the kernel may still have
  72  *              cache contents, so we set them to (CPU, CPU) always.
  73  *      2. Written by CPU (using pwrite)
  74  *              The pwrite function calls set_domain (CPU, CPU) and
  75  *              this function does nothing (as nothing changes)
  76  *      3. Mapped by GTT
  77  *              This function asserts that the object is not
  78  *              currently in any GPU-based read or write domains
  79  *      4. Read by GPU
  80  *              i915_gem_execbuffer calls set_domain (COMMAND, 0).
  81  *              As write_domain is zero, this function adds in the
  82  *              current read domains (CPU+COMMAND, 0).
  83  *              flush_domains is set to CPU.
  84  *              invalidate_domains is set to COMMAND
  85  *              clflush is run to get data out of the CPU caches
  86  *              then i915_dev_set_domain calls i915_gem_flush to
  87  *              emit an MI_FLUSH and drm_agp_chipset_flush
  88  *      5. Unmapped from GTT
  89  *              i915_gem_object_unbind calls set_domain (CPU, CPU)
  90  *              flush_domains and invalidate_domains end up both zero
  91  *              so no flushing/invalidating happens
  92  *      6. Freed
  93  *              yay, done
  94  *
  95  * Case 2: The shared render buffer
  96  *
  97  *      1. Allocated
  98  *      2. Mapped to GTT
  99  *      3. Read/written by GPU
 100  *      4. set_domain to (CPU,CPU)
 101  *      5. Read/written by CPU
 102  *      6. Read/written by GPU
 103  *
 104  *      1. Allocated
 105  *              Same as last example, (CPU, CPU)
 106  *      2. Mapped to GTT
 107  *              Nothing changes (assertions find that it is not in the GPU)
 108  *      3. Read/written by GPU
 109  *              execbuffer calls set_domain (RENDER, RENDER)
 110  *              flush_domains gets CPU
 111  *              invalidate_domains gets GPU
 112  *              clflush (obj)
 113  *              MI_FLUSH and drm_agp_chipset_flush
 114  *      4. set_domain (CPU, CPU)
 115  *              flush_domains gets GPU
 116  *              invalidate_domains gets CPU
 117  *              wait_rendering (obj) to make sure all drawing is complete.
 118  *              This will include an MI_FLUSH to get the data from GPU
 119  *              to memory
 120  *              clflush (obj) to invalidate the CPU cache
 121  *              Another MI_FLUSH in i915_gem_flush (eliminate this somehow?)
 122  *      5. Read/written by CPU
 123  *              cache lines are loaded and dirtied
 124  *      6. Read written by GPU
 125  *              Same as last GPU access
 126  *
 127  * Case 3: The constant buffer
 128  *
 129  *      1. Allocated
 130  *      2. Written by CPU
 131  *      3. Read by GPU
 132  *      4. Updated (written) by CPU again
 133  *      5. Read by GPU
 134  *
 135  *      1. Allocated
 136  *              (CPU, CPU)
 137  *      2. Written by CPU
 138  *              (CPU, CPU)
 139  *      3. Read by GPU
 140  *              (CPU+RENDER, 0)
 141  *              flush_domains = CPU
 142  *              invalidate_domains = RENDER
 143  *              clflush (obj)
 144  *              MI_FLUSH
 145  *              drm_agp_chipset_flush
 146  *      4. Updated (written) by CPU again
 147  *              (CPU, CPU)
 148  *              flush_domains = 0 (no previous write domain)
 149  *              invalidate_domains = 0 (no new read domains)
 150  *      5. Read by GPU
 151  *              (CPU+RENDER, 0)
 152  *              flush_domains = CPU
 153  *              invalidate_domains = RENDER
 154  *              clflush (obj)
 155  *              MI_FLUSH
 156  *              drm_agp_chipset_flush
 157  */
 158 static void
 159 i915_gem_object_set_to_gpu_domain(struct drm_i915_gem_object *obj,
 160                                   struct intel_ring_buffer *ring,
 161                                   struct change_domains *cd)
 162 {
 163         uint32_t invalidate_domains = 0, flush_domains = 0;
 164
 165         /*
 166          * If the object isn't moving to a new write domain,
 167          * let the object stay in multiple read domains
 168          */
 169         if (obj->base.pending_write_domain == 0)
 170                 obj->base.pending_read_domains |= obj->base.read_domains;
 171
 172         /*
 173          * Flush the current write domain if
 174          * the new read domains don't match. Invalidate
 175          * any read domains which differ from the old
 176          * write domain
 177          */
 178         if (obj->base.write_domain &&
 179             (((obj->base.write_domain != obj->base.pending_read_domains ||
 180                obj->ring != ring)) ||
 181              (obj->fenced_gpu_access && !obj->pending_fenced_gpu_access))) {
 182                 flush_domains |= obj->base.write_domain;
 183                 invalidate_domains |=
 184                         obj->base.pending_read_domains & ~obj->base.write_domain;
 185         }
 186         /*
 187          * Invalidate any read caches which may have
 188          * stale data. That is, any new read domains.
 189          */
 190         invalidate_domains |= obj->base.pending_read_domains & ~obj->base.read_domains;
 191         if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_CPU)
 192                 i915_gem_clflush_object(obj);
 193
 194         if (obj->base.pending_write_domain)
 195                 cd->flips |= atomic_load_acq_int(&obj->pending_flip);
 196
 197         /* The actual obj->write_domain will be updated with
 198          * pending_write_domain after we emit the accumulated flush for all
 199          * of our domain changes in execbuffers (which clears objects'
 200          * write_domains).  So if we have a current write domain that we
 201          * aren't changing, set pending_write_domain to that.
 202          */
 203         if (flush_domains == 0 && obj->base.pending_write_domain == 0)
 204                 obj->base.pending_write_domain = obj->base.write_domain;
 205
 206         cd->invalidate_domains |= invalidate_domains;
 207         cd->flush_domains |= flush_domains;
 208         if (flush_domains & I915_GEM_GPU_DOMAINS)
 209                 cd->flush_rings |= intel_ring_flag(obj->ring);
 210         if (invalidate_domains & I915_GEM_GPU_DOMAINS)
 211                 cd->flush_rings |= intel_ring_flag(ring);
 212 }
 213
 214 struct eb_objects {
 215         u_long hashmask;
 216         LIST_HEAD(, drm_i915_gem_object) *buckets;
 217 };
 218
 219 static struct eb_objects *
 220 eb_create(int size)
 221 {
 222         struct eb_objects *eb;
 223
 224         eb = malloc(sizeof(*eb), DRM_I915_GEM, M_WAITOK | M_ZERO);
 225         eb->buckets = hashinit(size, DRM_I915_GEM, &eb->hashmask);
 226         return (eb);
 227 }
 228
 229 static void
 230 eb_reset(struct eb_objects *eb)
 231 {
 232         int i;
 233
 234         for (i = 0; i <= eb->hashmask; i++)
 235                 LIST_INIT(&eb->buckets[i]);
 236 }
 237
 238 static void
 239 eb_add_object(struct eb_objects *eb, struct drm_i915_gem_object *obj)
 240 {
 241
 242         LIST_INSERT_HEAD(&eb->buckets[obj->exec_handle & eb->hashmask],
 243             obj, exec_node);
 244 }
 245
 246 static struct drm_i915_gem_object *
 247 eb_get_object(struct eb_objects *eb, unsigned long handle)
 248 {
 249         struct drm_i915_gem_object *obj;
 250
 251         LIST_FOREACH(obj, &eb->buckets[handle & eb->hashmask], exec_node) {
 252                 if (obj->exec_handle == handle)
 253                         return (obj);
 254         }
 255         return (NULL);
 256 }
 257
 258 static void
 259 eb_destroy(struct eb_objects *eb)
 260 {
 261
 262         free(eb->buckets, DRM_I915_GEM);
 263         free(eb, DRM_I915_GEM);
 264 }
 265
 266 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 267 {
 268         return (obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
 269                 obj->cache_level != I915_CACHE_NONE);
 270 }
 271
 272 static int
 273 i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
 274                                    struct eb_objects *eb,
 275                                    struct drm_i915_gem_relocation_entry *reloc)
 276 {
 277         struct drm_device *dev = obj->base.dev;
 278         struct drm_gem_object *target_obj;
 279         struct drm_i915_gem_object *target_i915_obj;
 280         uint32_t target_offset;
 281         int ret = -EINVAL;
 282
 283         /* we've already hold a reference to all valid objects */
 284         target_obj = &eb_get_object(eb, reloc->target_handle)->base;
 285         if (unlikely(target_obj == NULL))
 286                 return -ENOENT;
 287
 288         target_i915_obj = to_intel_bo(target_obj);
 289         target_offset = target_i915_obj->gtt_offset;
 290
 291 #if WATCH_RELOC
 292         DRM_INFO("%s: obj %p offset %08x target %d "
 293                  "read %08x write %08x gtt %08x "
 294                  "presumed %08x delta %08x\n",
 295                  __func__,
 296                  obj,
 297                  (int) reloc->offset,
 298                  (int) reloc->target_handle,
 299                  (int) reloc->read_domains,
 300                  (int) reloc->write_domain,
 301                  (int) target_offset,
 302                  (int) reloc->presumed_offset,
 303                  reloc->delta);
 304 #endif
 305
 306         /* The target buffer should have appeared before us in the
 307          * exec_object list, so it should have a GTT space bound by now.
 308          */
 309         if (unlikely(target_offset == 0)) {
 310                 DRM_DEBUG("No GTT space found for object %d\n",
 311                           reloc->target_handle);
 312                 return ret;
 313         }
 314
 315         /* Validate that the target is in a valid r/w GPU domain */
 316         if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
 317                 DRM_DEBUG("reloc with multiple write domains: "
 318                           "obj %p target %d offset %d "
 319                           "read %08x write %08x",
 320                           obj, reloc->target_handle,
 321                           (int) reloc->offset,
 322                           reloc->read_domains,
 323                           reloc->write_domain);
 324                 return ret;
 325         }
 326         if (unlikely((reloc->write_domain | reloc->read_domains)
 327                      & ~I915_GEM_GPU_DOMAINS)) {
 328                 DRM_DEBUG("reloc with read/write non-GPU domains: "
 329                           "obj %p target %d offset %d "
 330                           "read %08x write %08x",
 331                           obj, reloc->target_handle,
 332                           (int) reloc->offset,
 333                           reloc->read_domains,
 334                           reloc->write_domain);
 335                 return ret;
 336         }
 337         if (unlikely(reloc->write_domain && target_obj->pending_write_domain &&
 338                      reloc->write_domain != target_obj->pending_write_domain)) {
 339                 DRM_DEBUG("Write domain conflict: "
 340                           "obj %p target %d offset %d "
 341                           "new %08x old %08x\n",
 342                           obj, reloc->target_handle,
 343                           (int) reloc->offset,
 344                           reloc->write_domain,
 345                           target_obj->pending_write_domain);
 346                 return ret;
 347         }
 348
 349         target_obj->pending_read_domains |= reloc->read_domains;
 350         target_obj->pending_write_domain |= reloc->write_domain;
 351
 352         /* If the relocation already has the right value in it, no
 353          * more work needs to be done.
 354          */
 355         if (target_offset == reloc->presumed_offset)
 356                 return 0;
 357
 358         /* Check that the relocation address is valid... */
 359         if (unlikely(reloc->offset > obj->base.size - 4)) {
 360                 DRM_DEBUG("Relocation beyond object bounds: "
 361                           "obj %p target %d offset %d size %d.\n",
 362                           obj, reloc->target_handle,
 363                           (int) reloc->offset,
 364                           (int) obj->base.size);
 365                 return ret;
 366         }
 367         if (unlikely(reloc->offset & 3)) {
 368                 DRM_DEBUG("Relocation not 4-byte aligned: "
 369                           "obj %p target %d offset %d.\n",
 370                           obj, reloc->target_handle,
 371                           (int) reloc->offset);
 372                 return ret;
 373         }
 374
 375         /* We can't wait for rendering with pagefaults disabled */
 376         if (obj->active && (curthread->td_pflags & TDP_NOFAULTING) != 0)
 377                 return (-EFAULT);
 378
 379         reloc->delta += target_offset;
 380         if (use_cpu_reloc(obj)) {
 381                 uint32_t page_offset = reloc->offset & PAGE_MASK;
 382                 char *vaddr;
 383                 struct sf_buf *sf;
 384
 385                 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
 386                 if (ret)
 387                         return ret;
 388
 389                 sf = sf_buf_alloc(obj->pages[OFF_TO_IDX(reloc->offset)],
 390                     SFB_NOWAIT);
 391                 if (sf == NULL)
 392                         return (-ENOMEM);
 393                 vaddr = (void *)sf_buf_kva(sf);
 394                 *(uint32_t *)(vaddr + page_offset) = reloc->delta;
 395                 sf_buf_free(sf);
 396         } else {
 397                 uint32_t *reloc_entry;
 398                 char *reloc_page;
 399
 400                 ret = i915_gem_object_set_to_gtt_domain(obj, true);
 401                 if (ret)
 402                         return ret;
 403
 404                 ret = i915_gem_object_put_fence(obj);
 405                 if (ret)
 406                         return ret;
 407
 408                 /*
 409                  * Map the page containing the relocation we're going
 410                  * to perform.
 411                  */
 412                 reloc->offset += obj->gtt_offset;
 413                 reloc_page = pmap_mapdev_attr(dev->agp->base + (reloc->offset &
 414                     ~PAGE_MASK), PAGE_SIZE, PAT_WRITE_COMBINING);
 415                 reloc_entry = (uint32_t *)(reloc_page + (reloc->offset &
 416                     PAGE_MASK));
 417                 *(volatile uint32_t *)reloc_entry = reloc->delta;
 418                 pmap_unmapdev((vm_offset_t)reloc_page, PAGE_SIZE);
 419         }
 420
 421         /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
 422          * pipe_control writes because the gpu doesn't properly redirect them
 423          * through the ppgtt for non_secure batchbuffers. */
 424         if (unlikely(IS_GEN6(dev) &&
 425             reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION &&
 426             !target_i915_obj->has_global_gtt_mapping)) {
 427                 i915_gem_gtt_bind_object(target_i915_obj,
 428                                          target_i915_obj->cache_level);
 429         }
 430
 431         /* and update the user's relocation entry */
 432         reloc->presumed_offset = target_offset;
 433
 434         return 0;
 435 }
 436
 437 static int
 438 i915_gem_execbuffer_relocate_object(struct drm_i915_gem_object *obj,
 439     struct eb_objects *eb)
 440 {
 441 #define N_RELOC(x) ((x) / sizeof(struct drm_i915_gem_relocation_entry))
 442         struct drm_i915_gem_relocation_entry stack_reloc[N_RELOC(512)];
 443         struct drm_i915_gem_relocation_entry *user_relocs;
 444         struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
 445         int remain, ret;
 446
 447         user_relocs = (void *)(uintptr_t)entry->relocs_ptr;
 448         remain = entry->relocation_count;
 449         while (remain) {
 450                 struct drm_i915_gem_relocation_entry *r = stack_reloc;
 451                 int count = remain;
 452                 if (count > DRM_ARRAY_SIZE(stack_reloc))
 453                         count = DRM_ARRAY_SIZE(stack_reloc);
 454                 remain -= count;
 455
 456                 ret = -copyin_nofault(user_relocs, r, count*sizeof(r[0]));
 457                 if (ret != 0)
 458                         return (ret);
 459
 460                 do {
 461                         u64 offset = r->presumed_offset;
 462
 463                         ret = i915_gem_execbuffer_relocate_entry(obj, eb, r);
 464                         if (ret)
 465                                 return ret;
 466
 467                         if (r->presumed_offset != offset &&
 468                             copyout_nofault(&r->presumed_offset,
 469                                             &user_relocs->presumed_offset,
 470                                             sizeof(r->presumed_offset))) {
 471                                 return -EFAULT;
 472                         }
 473
 474                         user_relocs++;
 475                         r++;
 476                 } while (--count);
 477         }
 478 #undef N_RELOC
 479         return (0);
 480 }
 481
 482 static int
 483 i915_gem_execbuffer_relocate_object_slow(struct drm_i915_gem_object *obj,
 484     struct eb_objects *eb, struct drm_i915_gem_relocation_entry *relocs)
 485 {
 486         const struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
 487         int i, ret;
 488
 489         for (i = 0; i < entry->relocation_count; i++) {
 490                 ret = i915_gem_execbuffer_relocate_entry(obj, eb, &relocs[i]);
 491                 if (ret)
 492                         return ret;
 493         }
 494
 495         return 0;
 496 }
 497
 498 static int
 499 i915_gem_execbuffer_relocate(struct drm_device *dev,
 500                              struct eb_objects *eb,
 501                              struct list_head *objects)
 502 {
 503         struct drm_i915_gem_object *obj;
 504         int ret, pflags;
 505
 506         /* Try to move as many of the relocation targets off the active list
 507          * to avoid unnecessary fallbacks to the slow path, as we cannot wait
 508          * for the retirement with pagefaults disabled.
 509          */
 510         i915_gem_retire_requests(dev);
 511
 512         ret = 0;
 513         pflags = vm_fault_disable_pagefaults();
 514         /* This is the fast path and we cannot handle a pagefault whilst
 515          * holding the device lock lest the user pass in the relocations
 516          * contained within a mmaped bo. For in such a case we, the page
 517          * fault handler would call i915_gem_fault() and we would try to
 518          * acquire the device lock again. Obviously this is bad.
 519          */
 520
 521         list_for_each_entry(obj, objects, exec_list) {
 522                 ret = i915_gem_execbuffer_relocate_object(obj, eb);
 523                 if (ret != 0)
 524                         break;
 525         }
 526         vm_fault_enable_pagefaults(pflags);
 527         return (ret);
 528 }
 529
 530 #define  __EXEC_OBJECT_HAS_FENCE (1<<31)
 531
 532 static int
 533 need_reloc_mappable(struct drm_i915_gem_object *obj)
 534 {
 535         struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
 536         return entry->relocation_count && !use_cpu_reloc(obj);
 537 }
 538
 539 static int
 540 pin_and_fence_object(struct drm_i915_gem_object *obj,
 541                      struct intel_ring_buffer *ring)
 542 {
 543         struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
 544         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 545         bool need_fence, need_mappable;
 546         int ret;
 547
 548         need_fence =
 549                 has_fenced_gpu_access &&
 550                 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 551                 obj->tiling_mode != I915_TILING_NONE;
 552         need_mappable = need_fence || need_reloc_mappable(obj);
 553
 554         ret = i915_gem_object_pin(obj, entry->alignment, need_mappable);
 555         if (ret)
 556                 return ret;
 557
 558         if (has_fenced_gpu_access) {
 559                 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
 560                         ret = i915_gem_object_get_fence(obj);
 561                         if (ret)
 562                                 goto err_unpin;
 563
 564                         if (i915_gem_object_pin_fence(obj))
 565                                 entry->flags |= __EXEC_OBJECT_HAS_FENCE;
 566
 567                         obj->pending_fenced_gpu_access = true;
 568                 }
 569         }
 570
 571         entry->offset = obj->gtt_offset;
 572         return 0;
 573
 574 err_unpin:
 575         i915_gem_object_unpin(obj);
 576         return ret;
 577 }
 578
 579 static int
 580 i915_gem_execbuffer_reserve(struct intel_ring_buffer *ring,
 581                             struct drm_file *file,
 582                             struct list_head *objects)
 583 {
 584         drm_i915_private_t *dev_priv;
 585         struct drm_i915_gem_object *obj;
 586         int ret, retry;
 587         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 588         struct list_head ordered_objects;
 589
 590         dev_priv = ring->dev->dev_private;
 591         INIT_LIST_HEAD(&ordered_objects);
 592         while (!list_empty(objects)) {
 593                 struct drm_i915_gem_exec_object2 *entry;
 594                 bool need_fence, need_mappable;
 595
 596                 obj = list_first_entry(objects,
 597                                        struct drm_i915_gem_object,
 598                                        exec_list);
 599                 entry = obj->exec_entry;
 600
 601                 need_fence =
 602                         has_fenced_gpu_access &&
 603                         entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 604                         obj->tiling_mode != I915_TILING_NONE;
 605                 need_mappable = need_fence || need_reloc_mappable(obj);
 606
 607                 if (need_mappable)
 608                         list_move(&obj->exec_list, &ordered_objects);
 609                 else
 610                         list_move_tail(&obj->exec_list, &ordered_objects);
 611
 612                 obj->base.pending_read_domains = 0;
 613                 obj->base.pending_write_domain = 0;
 614         }
 615         list_splice(&ordered_objects, objects);
 616
 617         /* Attempt to pin all of the buffers into the GTT.
 618          * This is done in 3 phases:
 619          *
 620          * 1a. Unbind all objects that do not match the GTT constraints for
 621          *     the execbuffer (fenceable, mappable, alignment etc).
 622          * 1b. Increment pin count for already bound objects and obtain
 623          *     a fence register if required.
 624          * 2.  Bind new objects.
 625          * 3.  Decrement pin count.
 626          *
 627          * This avoid unnecessary unbinding of later objects in order to makr
 628          * room for the earlier objects *unless* we need to defragment.
 629          */
 630         retry = 0;
 631         do {
 632                 ret = 0;
 633
 634                 /* Unbind any ill-fitting objects or pin. */
 635                 list_for_each_entry(obj, objects, exec_list) {
 636                         struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
 637                         bool need_fence, need_mappable;
 638
 639                         if (!obj->gtt_space)
 640                                 continue;
 641
 642                         need_fence =
 643                                 has_fenced_gpu_access &&
 644                                 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 645                                 obj->tiling_mode != I915_TILING_NONE;
 646                         need_mappable = need_fence || need_reloc_mappable(obj);
 647
 648                         if ((entry->alignment && obj->gtt_offset & (entry->alignment - 1)) ||
 649                             (need_mappable && !obj->map_and_fenceable))
 650                                 ret = i915_gem_object_unbind(obj);
 651                         else
 652                                 ret = pin_and_fence_object(obj, ring);
 653                         if (ret)
 654                                 goto err;
 655                 }
 656
 657                 /* Bind fresh objects */
 658                 list_for_each_entry(obj, objects, exec_list) {
 659                         if (obj->gtt_space)
 660                                 continue;
 661
 662                         ret = pin_and_fence_object(obj, ring);
 663                         if (ret) {
 664                                 int ret_ignore;
 665
 666                                 /* This can potentially raise a harmless
 667                                  * -EINVAL if we failed to bind in the above
 668                                  * call. It cannot raise -EINTR since we know
 669                                  * that the bo is freshly bound and so will
 670                                  * not need to be flushed or waited upon.
 671                                  */
 672                                 ret_ignore = i915_gem_object_unbind(obj);
 673                                 (void)ret_ignore;
 674                                 if (obj->gtt_space != NULL)
 675                                         printf("%s: gtt_space\n", __func__);
 676                                 break;
 677                         }
 678                 }
 679
 680                 /* Decrement pin count for bound objects */
 681                 list_for_each_entry(obj, objects, exec_list) {
 682                         struct drm_i915_gem_exec_object2 *entry;
 683
 684                         if (!obj->gtt_space)
 685                                 continue;
 686
 687                         entry = obj->exec_entry;
 688                         if (entry->flags & __EXEC_OBJECT_HAS_FENCE) {
 689                                 i915_gem_object_unpin_fence(obj);
 690                                 entry->flags &= ~__EXEC_OBJECT_HAS_FENCE;
 691                         }
 692
 693                         i915_gem_object_unpin(obj);
 694
 695                         /* ... and ensure ppgtt mapping exist if needed. */
 696                         if (dev_priv->mm.aliasing_ppgtt && !obj->has_aliasing_ppgtt_mapping) {
 697                                 i915_ppgtt_bind_object(dev_priv->mm.aliasing_ppgtt,
 698                                                        obj, obj->cache_level);
 699
 700                                 obj->has_aliasing_ppgtt_mapping = 1;
 701                         }
 702                 }
 703
 704                 if (ret != -ENOSPC || retry > 1)
 705                         return ret;
 706
 707                 /* First attempt, just clear anything that is purgeable.
 708                  * Second attempt, clear the entire GTT.
 709                  */
 710                 ret = i915_gem_evict_everything(ring->dev, retry == 0);
 711                 if (ret)
 712                         return ret;
 713
 714                 retry++;
 715         } while (1);
 716
 717 err:
 718         list_for_each_entry_continue_reverse(obj, objects, exec_list) {
 719                 struct drm_i915_gem_exec_object2 *entry;
 720
 721                 if (!obj->gtt_space)
 722                         continue;
 723
 724                 entry = obj->exec_entry;
 725                 if (entry->flags & __EXEC_OBJECT_HAS_FENCE) {
 726                         i915_gem_object_unpin_fence(obj);
 727                         entry->flags &= ~__EXEC_OBJECT_HAS_FENCE;
 728                 }
 729
 730                 i915_gem_object_unpin(obj);
 731         }
 732
 733         return ret;
 734 }
 735
 736 static int
 737 i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
 738     struct drm_file *file, struct intel_ring_buffer *ring,
 739     struct list_head *objects, struct eb_objects *eb,
 740     struct drm_i915_gem_exec_object2 *exec, int count)
 741 {
 742         struct drm_i915_gem_relocation_entry *reloc;
 743         struct drm_i915_gem_object *obj;
 744         int *reloc_offset;
 745         int i, total, ret;
 746
 747         /* We may process another execbuffer during the unlock... */
 748         while (!list_empty(objects)) {
 749                 obj = list_first_entry(objects,
 750                                        struct drm_i915_gem_object,
 751                                        exec_list);
 752                 list_del_init(&obj->exec_list);
 753                 drm_gem_object_unreference(&obj->base);
 754         }
 755
 756         DRM_UNLOCK(dev);
 757
 758         total = 0;
 759         for (i = 0; i < count; i++)
 760                 total += exec[i].relocation_count;
 761
 762         reloc_offset = malloc(count * sizeof(*reloc_offset), DRM_I915_GEM,
 763             M_WAITOK | M_ZERO);
 764         reloc = malloc(total * sizeof(*reloc), DRM_I915_GEM, M_WAITOK | M_ZERO);
 765
 766         total = 0;
 767         for (i = 0; i < count; i++) {
 768                 struct drm_i915_gem_relocation_entry *user_relocs;
 769
 770                 user_relocs = (void *)(uintptr_t)exec[i].relocs_ptr;
 771                 ret = -copyin(user_relocs, reloc + total,
 772                     exec[i].relocation_count * sizeof(*reloc));
 773                 if (ret != 0) {
 774                         DRM_LOCK(dev);
 775                         goto err;
 776                 }
 777
 778                 reloc_offset[i] = total;
 779                 total += exec[i].relocation_count;
 780         }
 781
 782         ret = i915_mutex_lock_interruptible(dev);
 783         if (ret) {
 784                 DRM_LOCK(dev);
 785                 goto err;
 786         }
 787
 788         /* reacquire the objects */
 789         eb_reset(eb);
 790         for (i = 0; i < count; i++) {
 791                 struct drm_i915_gem_object *obj;
 792
 793                 obj = to_intel_bo(drm_gem_object_lookup(dev, file,
 794                                                         exec[i].handle));
 795                 if (&obj->base == NULL) {
 796                         DRM_DEBUG("Invalid object handle %d at index %d\n",
 797                                    exec[i].handle, i);
 798                         ret = -ENOENT;
 799                         goto err;
 800                 }
 801
 802                 list_add_tail(&obj->exec_list, objects);
 803                 obj->exec_handle = exec[i].handle;
 804                 obj->exec_entry = &exec[i];
 805                 eb_add_object(eb, obj);
 806         }
 807
 808         ret = i915_gem_execbuffer_reserve(ring, file, objects);
 809         if (ret)
 810                 goto err;
 811
 812         list_for_each_entry(obj, objects, exec_list) {
 813                 int offset = obj->exec_entry - exec;
 814                 ret = i915_gem_execbuffer_relocate_object_slow(obj, eb,
 815                     reloc + reloc_offset[offset]);
 816                 if (ret)
 817                         goto err;
 818         }
 819
 820         /* Leave the user relocations as are, this is the painfully slow path,
 821          * and we want to avoid the complication of dropping the lock whilst
 822          * having buffers reserved in the aperture and so causing spurious
 823          * ENOSPC for random operations.
 824          */
 825
 826 err:
 827         free(reloc, DRM_I915_GEM);
 828         free(reloc_offset, DRM_I915_GEM);
 829         return ret;
 830 }
 831
 832 static int
 833 i915_gem_execbuffer_flush(struct drm_device *dev,
 834                           uint32_t invalidate_domains,
 835                           uint32_t flush_domains,
 836                           uint32_t flush_rings)
 837 {
 838         drm_i915_private_t *dev_priv = dev->dev_private;
 839         int i, ret;
 840
 841         if (flush_domains & I915_GEM_DOMAIN_CPU)
 842                 intel_gtt_chipset_flush();
 843
 844         if (flush_domains & I915_GEM_DOMAIN_GTT)
 845                 wmb();
 846
 847         if ((flush_domains | invalidate_domains) & I915_GEM_GPU_DOMAINS) {
 848                 for (i = 0; i < I915_NUM_RINGS; i++)
 849                         if (flush_rings & (1 << i)) {
 850                                 ret = i915_gem_flush_ring(&dev_priv->rings[i],
 851                                     invalidate_domains, flush_domains);
 852                                 if (ret)
 853                                         return ret;
 854                         }
 855         }
 856
 857         return 0;
 858 }
 859
 860 static int
 861 i915_gem_execbuffer_wait_for_flips(struct intel_ring_buffer *ring, u32 flips)
 862 {
 863         u32 plane, flip_mask;
 864         int ret;
 865
 866         /* Check for any pending flips. As we only maintain a flip queue depth
 867          * of 1, we can simply insert a WAIT for the next display flip prior
 868          * to executing the batch and avoid stalling the CPU.
 869          */
 870
 871         for (plane = 0; flips >> plane; plane++) {
 872                 if (((flips >> plane) & 1) == 0)
 873                         continue;
 874
 875                 if (plane)
 876                         flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
 877                 else
 878                         flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
 879
 880                 ret = intel_ring_begin(ring, 2);
 881                 if (ret)
 882                         return ret;
 883
 884                 intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
 885                 intel_ring_emit(ring, MI_NOOP);
 886                 intel_ring_advance(ring);
 887         }
 888
 889         return 0;
 890 }
 891
 892 static int
 893 i915_gem_execbuffer_move_to_gpu(struct intel_ring_buffer *ring,
 894                                 struct list_head *objects)
 895 {
 896         struct drm_i915_gem_object *obj;
 897         struct change_domains cd;
 898         int ret;
 899
 900         memset(&cd, 0, sizeof(cd));
 901         list_for_each_entry(obj, objects, exec_list)
 902                 i915_gem_object_set_to_gpu_domain(obj, ring, &cd);
 903
 904         if (cd.invalidate_domains | cd.flush_domains) {
 905 #if WATCH_EXEC
 906                 DRM_INFO("%s: invalidate_domains %08x flush_domains %08x\n",
 907                           __func__,
 908                          cd.invalidate_domains,
 909                          cd.flush_domains);
 910 #endif
 911                 ret = i915_gem_execbuffer_flush(ring->dev,
 912                                                 cd.invalidate_domains,
 913                                                 cd.flush_domains,
 914                                                 cd.flush_rings);
 915                 if (ret)
 916                         return ret;
 917         }
 918
 919         if (cd.flips) {
 920                 ret = i915_gem_execbuffer_wait_for_flips(ring, cd.flips);
 921                 if (ret)
 922                         return ret;
 923         }
 924
 925         list_for_each_entry(obj, objects, exec_list) {
 926                 ret = i915_gem_object_sync(obj, ring);
 927                 if (ret)
 928                         return ret;
 929         }
 930
 931         return 0;
 932 }
 933
 934 static bool
 935 i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
 936 {
 937         return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
 938 }
 939
 940 static int
 941 validate_exec_list(struct drm_i915_gem_exec_object2 *exec, int count,
 942     vm_page_t ***map, int **maplen)
 943 {
 944         vm_page_t *ma;
 945         int i, length, page_count;
 946
 947         /* XXXKIB various limits checking is missing there */
 948         *map = malloc(count * sizeof(*ma), DRM_I915_GEM, M_WAITOK | M_ZERO);
 949         *maplen = malloc(count * sizeof(*maplen), DRM_I915_GEM, M_WAITOK |
 950             M_ZERO);
 951         for (i = 0; i < count; i++) {
 952                 /* First check for malicious input causing overflow */
 953                 if (exec[i].relocation_count >
 954                     INT_MAX / sizeof(struct drm_i915_gem_relocation_entry))
 955                         return -EINVAL;
 956
 957                 length = exec[i].relocation_count *
 958                     sizeof(struct drm_i915_gem_relocation_entry);
 959                 if (length == 0) {
 960                         (*map)[i] = NULL;
 961                         continue;
 962                 }
 963                 /*
 964                  * Since both start and end of the relocation region
 965                  * may be not aligned on the page boundary, be
 966                  * conservative and request a page slot for each
 967                  * partial page.  Thus +2.
 968                  */
 969                 page_count = howmany(length, PAGE_SIZE) + 2;
 970                 ma = (*map)[i] = malloc(page_count * sizeof(vm_page_t),
 971                     DRM_I915_GEM, M_WAITOK | M_ZERO);
 972                 (*maplen)[i] = vm_fault_quick_hold_pages(
 973                     &curproc->p_vmspace->vm_map, exec[i].relocs_ptr, length,
 974                     VM_PROT_READ | VM_PROT_WRITE, ma, page_count);
 975                 if ((*maplen)[i] == -1) {
 976                         free(ma, DRM_I915_GEM);
 977                         (*map)[i] = NULL;
 978                         return (-EFAULT);
 979                 }
 980         }
 981
 982         return 0;
 983 }
 984
 985 static void
 986 i915_gem_execbuffer_move_to_active(struct list_head *objects,
 987                                    struct intel_ring_buffer *ring,
 988                                    u32 seqno)
 989 {
 990         struct drm_i915_gem_object *obj;
 991         uint32_t old_read, old_write;
 992
 993         list_for_each_entry(obj, objects, exec_list) {
 994                 old_read = obj->base.read_domains;
 995                 old_write = obj->base.write_domain;
 996
 997                 obj->base.read_domains = obj->base.pending_read_domains;
 998                 obj->base.write_domain = obj->base.pending_write_domain;
 999                 obj->fenced_gpu_access = obj->pending_fenced_gpu_access;
1000
1001                 i915_gem_object_move_to_active(obj, ring, seqno);
1002                 if (obj->base.write_domain) {
1003                         obj->dirty = 1;
1004                         obj->pending_gpu_write = true;
1005                         list_move_tail(&obj->gpu_write_list,
1006                                        &ring->gpu_write_list);
1007                         if (obj->pin_count) /* check for potential scanout */
1008                                 intel_mark_busy(ring->dev, obj);
1009                 }
1010                 CTR3(KTR_DRM, "object_change_domain move_to_active %p %x %x",
1011                     obj, old_read, old_write);
1012         }
1013
1014         intel_mark_busy(ring->dev, NULL);
1015 }
1016
1017 int i915_gem_sync_exec_requests;
1018
1019 static void
1020 i915_gem_execbuffer_retire_commands(struct drm_device *dev,
1021                                     struct drm_file *file,
1022                                     struct intel_ring_buffer *ring)
1023 {
1024         struct drm_i915_gem_request *request;
1025         u32 invalidate;
1026
1027         /*
1028          * Ensure that the commands in the batch buffer are
1029          * finished before the interrupt fires.
1030          *
1031          * The sampler always gets flushed on i965 (sigh).
1032          */
1033         invalidate = I915_GEM_DOMAIN_COMMAND;
1034         if (INTEL_INFO(dev)->gen >= 4)
1035                 invalidate |= I915_GEM_DOMAIN_SAMPLER;
1036         if (ring->flush(ring, invalidate, 0)) {
1037                 i915_gem_next_request_seqno(ring);
1038                 return;
1039         }
1040
1041         /* Add a breadcrumb for the completion of the batch buffer */
1042         request = malloc(sizeof(*request), DRM_I915_GEM, M_WAITOK | M_ZERO);
1043         if (request == NULL || i915_add_request(ring, file, request)) {
1044                 i915_gem_next_request_seqno(ring);
1045                 free(request, DRM_I915_GEM);
1046         } else if (i915_gem_sync_exec_requests) {
1047                 i915_wait_request(ring, request->seqno);
1048                 i915_gem_retire_requests(dev);
1049         }
1050 }
1051
1052 static void
1053 i915_gem_fix_mi_batchbuffer_end(struct drm_i915_gem_object *batch_obj,
1054     uint32_t batch_start_offset, uint32_t batch_len)
1055 {
1056         char *mkva;
1057         uint64_t po_r, po_w;
1058         uint32_t cmd;
1059
1060         po_r = batch_obj->base.dev->agp->base + batch_obj->gtt_offset +
1061             batch_start_offset + batch_len;
1062         if (batch_len > 0)
1063                 po_r -= 4;
1064         mkva = pmap_mapdev_attr(trunc_page(po_r), 2 * PAGE_SIZE,
1065             PAT_WRITE_COMBINING);
1066         po_r &= PAGE_MASK;
1067         cmd = *(uint32_t *)(mkva + po_r);
1068
1069         if (cmd != MI_BATCH_BUFFER_END) {
1070                 /*
1071                  * batch_len != 0 due to the check at the start of
1072                  * i915_gem_do_execbuffer
1073                  */
1074                 if (batch_obj->base.size > batch_start_offset + batch_len) {
1075                         po_w = po_r + 4;
1076 /* DRM_DEBUG("batchbuffer does not end by MI_BATCH_BUFFER_END !\n"); */
1077                 } else {
1078                         po_w = po_r;
1079 DRM_DEBUG("batchbuffer does not end by MI_BATCH_BUFFER_END, overwriting last bo cmd !\n");
1080                 }
1081                 *(uint32_t *)(mkva + po_w) = MI_BATCH_BUFFER_END;
1082         }
1083
1084         pmap_unmapdev((vm_offset_t)mkva, 2 * PAGE_SIZE);
1085 }
1086
1087 int i915_fix_mi_batchbuffer_end = 0;
1088
1089  static int
1090 i915_reset_gen7_sol_offsets(struct drm_device *dev,
1091                             struct intel_ring_buffer *ring)
1092 {
1093         drm_i915_private_t *dev_priv = dev->dev_private;
1094         int ret, i;
1095
1096         if (!IS_GEN7(dev) || ring != &dev_priv->rings[RCS])
1097                 return 0;
1098
1099         ret = intel_ring_begin(ring, 4 * 3);
1100         if (ret)
1101                 return ret;
1102
1103         for (i = 0; i < 4; i++) {
1104                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1105                 intel_ring_emit(ring, GEN7_SO_WRITE_OFFSET(i));
1106                 intel_ring_emit(ring, 0);
1107         }
1108
1109         intel_ring_advance(ring);
1110
1111         return 0;
1112 }
1113
1114 static int
1115 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
1116                        struct drm_file *file,
1117                        struct drm_i915_gem_execbuffer2 *args,
1118                        struct drm_i915_gem_exec_object2 *exec)
1119 {
1120         drm_i915_private_t *dev_priv = dev->dev_private;
1121         struct list_head objects;
1122         struct eb_objects *eb;
1123         struct drm_i915_gem_object *batch_obj;
1124         struct drm_clip_rect *cliprects = NULL;
1125         struct intel_ring_buffer *ring;
1126         vm_page_t **relocs_ma;
1127         int *relocs_len;
1128         u32 ctx_id = i915_execbuffer2_get_context_id(*args);
1129         u32 exec_start, exec_len;
1130         u32 seqno;
1131         u32 mask;
1132         int ret, mode, i;
1133
1134         if (!i915_gem_check_execbuffer(args)) {
1135                 DRM_DEBUG("execbuf with invalid offset/length\n");
1136                 return -EINVAL;
1137         }
1138
1139         if (args->batch_len == 0)
1140                 return (0);
1141
1142         ret = validate_exec_list(exec, args->buffer_count, &relocs_ma,
1143             &relocs_len);
1144         if (ret != 0)
1145                 goto pre_struct_lock_err;
1146
1147         switch (args->flags & I915_EXEC_RING_MASK) {
1148         case I915_EXEC_DEFAULT:
1149         case I915_EXEC_RENDER:
1150                 ring = &dev_priv->rings[RCS];
1151                 break;
1152         case I915_EXEC_BSD:
1153                 ring = &dev_priv->rings[VCS];
1154                 if (ctx_id != 0) {
1155                         DRM_DEBUG("Ring %s doesn't support contexts\n",
1156                                   ring->name);
1157                         ret = -EPERM;
1158                         goto pre_struct_lock_err;
1159                 }
1160                 break;
1161         case I915_EXEC_BLT:
1162                 ring = &dev_priv->rings[BCS];
1163                 if (ctx_id != 0) {
1164                         DRM_DEBUG("Ring %s doesn't support contexts\n",
1165                                   ring->name);
1166                         ret = -EPERM;
1167                         goto pre_struct_lock_err;
1168                 }
1169                 break;
1170         default:
1171                 DRM_DEBUG("execbuf with unknown ring: %d\n",
1172                           (int)(args->flags & I915_EXEC_RING_MASK));
1173                 ret = -EINVAL;
1174                 goto pre_struct_lock_err;
1175         }
1176         if (!intel_ring_initialized(ring)) {
1177                 DRM_DEBUG("execbuf with invalid ring: %d\n",
1178                           (int)(args->flags & I915_EXEC_RING_MASK));
1179                 ret = -EINVAL;
1180                 goto pre_struct_lock_err;
1181         }
1182
1183         mode = args->flags & I915_EXEC_CONSTANTS_MASK;
1184         mask = I915_EXEC_CONSTANTS_MASK;
1185         switch (mode) {
1186         case I915_EXEC_CONSTANTS_REL_GENERAL:
1187         case I915_EXEC_CONSTANTS_ABSOLUTE:
1188         case I915_EXEC_CONSTANTS_REL_SURFACE:
1189                 if (ring == &dev_priv->rings[RCS] &&
1190                     mode != dev_priv->relative_constants_mode) {
1191                         if (INTEL_INFO(dev)->gen < 4) {
1192                                 ret = -EINVAL;
1193                                 goto pre_struct_lock_err;
1194                         }
1195
1196                         if (INTEL_INFO(dev)->gen > 5 &&
1197                             mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
1198                                 ret = -EINVAL;
1199                                 goto pre_struct_lock_err;
1200                         }
1201
1202                         /* The HW changed the meaning on this bit on gen6 */
1203                         if (INTEL_INFO(dev)->gen >= 6)
1204                                 mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
1205                 }
1206                 break;
1207         default:
1208                 DRM_DEBUG("execbuf with unknown constants: %d\n", mode);
1209                 ret = -EINVAL;
1210                 goto pre_struct_lock_err;
1211         }
1212
1213         if (args->buffer_count < 1) {
1214                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1215                 ret = -EINVAL;
1216                 goto pre_struct_lock_err;
1217         }
1218
1219         if (args->num_cliprects != 0) {
1220                 if (ring != &dev_priv->rings[RCS]) {
1221         DRM_DEBUG("clip rectangles are only valid with the render ring\n");
1222                         ret = -EINVAL;
1223                         goto pre_struct_lock_err;
1224                 }
1225
1226                 if (INTEL_INFO(dev)->gen >= 5) {
1227                         DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
1228                         ret = -EINVAL;
1229                         goto pre_struct_lock_err;
1230                 }
1231
1232                 if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) {
1233                         DRM_DEBUG("execbuf with %u cliprects\n",
1234                                   args->num_cliprects);
1235                         ret = -EINVAL;
1236                         goto pre_struct_lock_err;
1237                 }
1238                 cliprects = malloc( sizeof(*cliprects) * args->num_cliprects,
1239                     DRM_I915_GEM, M_WAITOK | M_ZERO);
1240                 ret = -copyin((void *)(uintptr_t)args->cliprects_ptr, cliprects,
1241                     sizeof(*cliprects) * args->num_cliprects);
1242                 if (ret != 0)
1243                         goto pre_struct_lock_err;
1244         }
1245
1246         ret = i915_mutex_lock_interruptible(dev);
1247         if (ret)
1248                 goto pre_struct_lock_err;
1249
1250         if (dev_priv->mm.suspended) {
1251                 DRM_UNLOCK(dev);
1252                 ret = -EBUSY;
1253                 goto pre_struct_lock_err;
1254         }
1255
1256         eb = eb_create(args->buffer_count);
1257         if (eb == NULL) {
1258                 DRM_UNLOCK(dev);
1259                 ret = -ENOMEM;
1260                 goto pre_struct_lock_err;
1261         }
1262
1263         /* Look up object handles */
1264         INIT_LIST_HEAD(&objects);
1265         for (i = 0; i < args->buffer_count; i++) {
1266                 struct drm_i915_gem_object *obj;
1267                 obj = to_intel_bo(drm_gem_object_lookup(dev, file,
1268                                                         exec[i].handle));
1269                 if (&obj->base == NULL) {
1270                         DRM_DEBUG("Invalid object handle %d at index %d\n",
1271                                    exec[i].handle, i);
1272                         /* prevent error path from reading uninitialized data */
1273                         ret = -ENOENT;
1274                         goto err;
1275                 }
1276
1277                 if (!list_empty(&obj->exec_list)) {
1278                         DRM_DEBUG("Object %p [handle %d, index %d] appears more than once in object list\n",
1279                                    obj, exec[i].handle, i);
1280                         ret = -EINVAL;
1281                         goto err;
1282                 }
1283
1284                 list_add_tail(&obj->exec_list, &objects);
1285                 obj->exec_handle = exec[i].handle;
1286                 obj->exec_entry = &exec[i];
1287                 eb_add_object(eb, obj);
1288         }
1289
1290         /* take note of the batch buffer before we might reorder the lists */
1291         batch_obj = list_entry(objects.prev,
1292                                struct drm_i915_gem_object,
1293                                exec_list);
1294
1295         /* Move the objects en-masse into the GTT, evicting if necessary. */
1296         ret = i915_gem_execbuffer_reserve(ring, file, &objects);
1297         if (ret)
1298                 goto err;
1299
1300         /* The objects are in their final locations, apply the relocations. */
1301         ret = i915_gem_execbuffer_relocate(dev, eb, &objects);
1302         if (ret) {
1303                 if (ret == -EFAULT) {
1304                         ret = i915_gem_execbuffer_relocate_slow(dev, file, ring,
1305                             &objects, eb, exec, args->buffer_count);
1306                         DRM_LOCK_ASSERT(dev);
1307                 }
1308                 if (ret)
1309                         goto err;
1310         }
1311
1312         /* Set the pending read domains for the batch buffer to COMMAND */
1313         if (batch_obj->base.pending_write_domain) {
1314                 DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
1315                 ret = -EINVAL;
1316                 goto err;
1317         }
1318         batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
1319
1320         ret = i915_gem_execbuffer_move_to_gpu(ring, &objects);
1321         if (ret)
1322                 goto err;
1323
1324         ret = i915_switch_context(ring, file, ctx_id);
1325         if (ret)
1326                 goto err;
1327
1328         seqno = i915_gem_next_request_seqno(ring);
1329         for (i = 0; i < I915_NUM_RINGS - 1; i++) {
1330                 if (seqno < ring->sync_seqno[i]) {
1331                         /* The GPU can not handle its semaphore value wrapping,
1332                          * so every billion or so execbuffers, we need to stall
1333                          * the GPU in order to reset the counters.
1334                          */
1335                         ret = i915_gpu_idle(dev);
1336                         if (ret)
1337                                 goto err;
1338                         i915_gem_retire_requests(dev);
1339
1340                         KASSERT(ring->sync_seqno[i] == 0, ("Non-zero sync_seqno"));
1341                 }
1342         }
1343
1344         if (ring == &dev_priv->rings[RCS] &&
1345             mode != dev_priv->relative_constants_mode) {
1346                 ret = intel_ring_begin(ring, 4);
1347                 if (ret)
1348                         goto err;
1349
1350                 intel_ring_emit(ring, MI_NOOP);
1351                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1352                 intel_ring_emit(ring, INSTPM);
1353                 intel_ring_emit(ring, mask << 16 | mode);
1354                 intel_ring_advance(ring);
1355
1356                 dev_priv->relative_constants_mode = mode;
1357         }
1358
1359         if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
1360                 ret = i915_reset_gen7_sol_offsets(dev, ring);
1361                 if (ret)
1362                         goto err;
1363         }
1364
1365         exec_start = batch_obj->gtt_offset + args->batch_start_offset;
1366         exec_len = args->batch_len;
1367
1368         if (i915_fix_mi_batchbuffer_end) {
1369                 i915_gem_fix_mi_batchbuffer_end(batch_obj,
1370                     args->batch_start_offset, args->batch_len);
1371         }
1372
1373         CTR4(KTR_DRM, "ring_dispatch %s %d exec %x %x", ring->name, seqno,
1374             exec_start, exec_len);
1375
1376         if (cliprects) {
1377                 for (i = 0; i < args->num_cliprects; i++) {
1378                         ret = i915_emit_box_p(dev, &cliprects[i],
1379                             args->DR1, args->DR4);
1380                         if (ret)
1381                                 goto err;
1382
1383                         ret = ring->dispatch_execbuffer(ring, exec_start,
1384                             exec_len);
1385                         if (ret)
1386                                 goto err;
1387                 }
1388         } else {
1389                 ret = ring->dispatch_execbuffer(ring, exec_start, exec_len);
1390                 if (ret)
1391                         goto err;
1392         }
1393
1394         i915_gem_execbuffer_move_to_active(&objects, ring, seqno);
1395         i915_gem_execbuffer_retire_commands(dev, file, ring);
1396
1397 err:
1398         eb_destroy(eb);
1399         while (!list_empty(&objects)) {
1400                 struct drm_i915_gem_object *obj;
1401
1402                 obj = list_first_entry(&objects, struct drm_i915_gem_object,
1403                     exec_list);
1404                 list_del_init(&obj->exec_list);
1405                 drm_gem_object_unreference(&obj->base);
1406         }
1407         DRM_UNLOCK(dev);
1408
1409 pre_struct_lock_err:
1410         for (i = 0; i < args->buffer_count; i++) {
1411                 if (relocs_ma[i] != NULL) {
1412                         vm_page_unhold_pages(relocs_ma[i], relocs_len[i]);
1413                         free(relocs_ma[i], DRM_I915_GEM);
1414                 }
1415         }
1416         free(relocs_len, DRM_I915_GEM);
1417         free(relocs_ma, DRM_I915_GEM);
1418         free(cliprects, DRM_I915_GEM);
1419         return ret;
1420 }
1421
1422 /*
1423  * Legacy execbuffer just creates an exec2 list from the original exec object
1424  * list array and passes it to the real function.
1425  */
1426 int
1427 i915_gem_execbuffer(struct drm_device *dev, void *data,
1428                     struct drm_file *file)
1429 {
1430         struct drm_i915_gem_execbuffer *args = data;
1431         struct drm_i915_gem_execbuffer2 exec2;
1432         struct drm_i915_gem_exec_object *exec_list = NULL;
1433         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1434         int ret, i;
1435
1436         DRM_DEBUG("buffers_ptr %d buffer_count %d len %08x\n",
1437             (int) args->buffers_ptr, args->buffer_count, args->batch_len);
1438
1439         if (args->buffer_count < 1) {
1440                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1441                 return -EINVAL;
1442         }
1443
1444         /* Copy in the exec list from userland */
1445         /* XXXKIB user-controlled malloc size */
1446         exec_list = malloc(sizeof(*exec_list) * args->buffer_count,
1447             DRM_I915_GEM, M_WAITOK);
1448         exec2_list = malloc(sizeof(*exec2_list) * args->buffer_count,
1449             DRM_I915_GEM, M_WAITOK);
1450         ret = -copyin((void *)(uintptr_t)args->buffers_ptr, exec_list,
1451             sizeof(*exec_list) * args->buffer_count);
1452         if (ret != 0) {
1453                 DRM_DEBUG("copy %d exec entries failed %d\n",
1454                           args->buffer_count, ret);
1455                 free(exec_list, DRM_I915_GEM);
1456                 free(exec2_list, DRM_I915_GEM);
1457                 return (ret);
1458         }
1459
1460         for (i = 0; i < args->buffer_count; i++) {
1461                 exec2_list[i].handle = exec_list[i].handle;
1462                 exec2_list[i].relocation_count = exec_list[i].relocation_count;
1463                 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
1464                 exec2_list[i].alignment = exec_list[i].alignment;
1465                 exec2_list[i].offset = exec_list[i].offset;
1466                 if (INTEL_INFO(dev)->gen < 4)
1467                         exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
1468                 else
1469                         exec2_list[i].flags = 0;
1470         }
1471
1472         exec2.buffers_ptr = args->buffers_ptr;
1473         exec2.buffer_count = args->buffer_count;
1474         exec2.batch_start_offset = args->batch_start_offset;
1475         exec2.batch_len = args->batch_len;
1476         exec2.DR1 = args->DR1;
1477         exec2.DR4 = args->DR4;
1478         exec2.num_cliprects = args->num_cliprects;
1479         exec2.cliprects_ptr = args->cliprects_ptr;
1480         exec2.flags = I915_EXEC_RENDER;
1481         i915_execbuffer2_set_context_id(exec2, 0);
1482
1483         ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
1484         if (!ret) {
1485                 /* Copy the new buffer offsets back to the user's exec list. */
1486                 for (i = 0; i < args->buffer_count; i++)
1487                         exec_list[i].offset = exec2_list[i].offset;
1488                 /* ... and back out to userspace */
1489                 ret = -copyout(exec_list, (void *)(uintptr_t)args->buffers_ptr,
1490                     sizeof(*exec_list) * args->buffer_count);
1491                 if (ret != 0) {
1492                         DRM_DEBUG("failed to copy %d exec entries "
1493                                   "back to user (%d)\n",
1494                                   args->buffer_count, ret);
1495                 }
1496         }
1497
1498         free(exec_list, DRM_I915_GEM);
1499         free(exec2_list, DRM_I915_GEM);
1500         return ret;
1501 }
1502
1503 int
1504 i915_gem_execbuffer2(struct drm_device *dev, void *data,
1505                      struct drm_file *file)
1506 {
1507         struct drm_i915_gem_execbuffer2 *args = data;
1508         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1509         int ret;
1510
1511         DRM_DEBUG("buffers_ptr %jx buffer_count %d len %08x\n",
1512             (uintmax_t)args->buffers_ptr, args->buffer_count, args->batch_len);
1513
1514         if (args->buffer_count < 1 ||
1515             args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
1516                 DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
1517                 return -EINVAL;
1518         }
1519
1520         /* XXXKIB user-controllable malloc size */
1521         exec2_list = malloc(sizeof(*exec2_list) * args->buffer_count,
1522             DRM_I915_GEM, M_WAITOK);
1523         ret = -copyin((void *)(uintptr_t)args->buffers_ptr, exec2_list,
1524             sizeof(*exec2_list) * args->buffer_count);
1525         if (ret != 0) {
1526                 DRM_DEBUG("copy %d exec entries failed %d\n",
1527                           args->buffer_count, ret);
1528                 free(exec2_list, DRM_I915_GEM);
1529                 return (ret);
1530         }
1531
1532         ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list);
1533         if (!ret) {
1534                 /* Copy the new buffer offsets back to the user's exec list. */
1535                 ret = -copyout(exec2_list, (void *)(uintptr_t)args->buffers_ptr,
1536                     sizeof(*exec2_list) * args->buffer_count);
1537                 if (ret) {
1538                         DRM_DEBUG("failed to copy %d exec entries "
1539                                   "back to user (%d)\n",
1540                                   args->buffer_count, ret);
1541                 }
1542         }
1543
1544         free(exec2_list, DRM_I915_GEM);
1545         return ret;
1546 }