drivers/gpu/drm/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 <drm/drmP.h>
  30 #include <drm/i915_drm.h>
  31 #include "i915_drv.h"
  32 #include "i915_trace.h"
  33 #include "intel_drv.h"
  34 #include <linux/dma_remapping.h>
  35
  36 #define  __EXEC_OBJECT_HAS_PIN (1<<31)
  37 #define  __EXEC_OBJECT_HAS_FENCE (1<<30)
  38
  39 struct eb_vmas {
  40         struct list_head vmas;
  41         int and;
  42         union {
  43                 struct i915_vma *lut[0];
  44                 struct hlist_head buckets[0];
  45         };
  46 };
  47
  48 static struct eb_vmas *
  49 eb_create(struct drm_i915_gem_execbuffer2 *args)
  50 {
  51         struct eb_vmas *eb = NULL;
  52
  53         if (args->flags & I915_EXEC_HANDLE_LUT) {
  54                 unsigned size = args->buffer_count;
  55                 size *= sizeof(struct i915_vma *);
  56                 size += sizeof(struct eb_vmas);
  57                 eb = kmalloc(size, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  58         }
  59
  60         if (eb == NULL) {
  61                 unsigned size = args->buffer_count;
  62                 unsigned count = PAGE_SIZE / sizeof(struct hlist_head) / 2;
  63                 BUILD_BUG_ON_NOT_POWER_OF_2(PAGE_SIZE / sizeof(struct hlist_head));
  64                 while (count > 2*size)
  65                         count >>= 1;
  66                 eb = kzalloc(count*sizeof(struct hlist_head) +
  67                              sizeof(struct eb_vmas),
  68                              GFP_TEMPORARY);
  69                 if (eb == NULL)
  70                         return eb;
  71
  72                 eb->and = count - 1;
  73         } else
  74                 eb->and = -args->buffer_count;
  75
  76         INIT_LIST_HEAD(&eb->vmas);
  77         return eb;
  78 }
  79
  80 static void
  81 eb_reset(struct eb_vmas *eb)
  82 {
  83         if (eb->and >= 0)
  84                 memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
  85 }
  86
  87 static int
  88 eb_lookup_vmas(struct eb_vmas *eb,
  89                struct drm_i915_gem_exec_object2 *exec,
  90                const struct drm_i915_gem_execbuffer2 *args,
  91                struct i915_address_space *vm,
  92                struct drm_file *file)
  93 {
  94         struct drm_i915_private *dev_priv = vm->dev->dev_private;
  95         struct drm_i915_gem_object *obj;
  96         struct list_head objects;
  97         int i, ret;
  98
  99         INIT_LIST_HEAD(&objects);
 100         spin_lock(&file->table_lock);
 101         /* Grab a reference to the object and release the lock so we can lookup
 102          * or create the VMA without using GFP_ATOMIC */
 103         for (i = 0; i < args->buffer_count; i++) {
 104                 obj = to_intel_bo(idr_find(&file->object_idr, exec[i].handle));
 105                 if (obj == NULL) {
 106                         spin_unlock(&file->table_lock);
 107                         DRM_DEBUG("Invalid object handle %d at index %d\n",
 108                                    exec[i].handle, i);
 109                         ret = -ENOENT;
 110                         goto err;
 111                 }
 112
 113                 if (!list_empty(&obj->obj_exec_link)) {
 114                         spin_unlock(&file->table_lock);
 115                         DRM_DEBUG("Object %p [handle %d, index %d] appears more than once in object list\n",
 116                                    obj, exec[i].handle, i);
 117                         ret = -EINVAL;
 118                         goto err;
 119                 }
 120
 121                 drm_gem_object_reference(&obj->base);
 122                 list_add_tail(&obj->obj_exec_link, &objects);
 123         }
 124         spin_unlock(&file->table_lock);
 125
 126         i = 0;
 127         while (!list_empty(&objects)) {
 128                 struct i915_vma *vma;
 129                 struct i915_address_space *bind_vm = vm;
 130
 131                 if (exec[i].flags & EXEC_OBJECT_NEEDS_GTT &&
 132                     USES_FULL_PPGTT(vm->dev)) {
 133                         ret = -EINVAL;
 134                         goto err;
 135                 }
 136
 137                 /* If we have secure dispatch, or the userspace assures us that
 138                  * they know what they're doing, use the GGTT VM.
 139                  */
 140                 if (((args->flags & I915_EXEC_SECURE) &&
 141                     (i == (args->buffer_count - 1))))
 142                         bind_vm = &dev_priv->gtt.base;
 143
 144                 obj = list_first_entry(&objects,
 145                                        struct drm_i915_gem_object,
 146                                        obj_exec_link);
 147
 148                 /*
 149                  * NOTE: We can leak any vmas created here when something fails
 150                  * later on. But that's no issue since vma_unbind can deal with
 151                  * vmas which are not actually bound. And since only
 152                  * lookup_or_create exists as an interface to get at the vma
 153                  * from the (obj, vm) we don't run the risk of creating
 154                  * duplicated vmas for the same vm.
 155                  */
 156                 vma = i915_gem_obj_lookup_or_create_vma(obj, bind_vm);
 157                 if (IS_ERR(vma)) {
 158                         DRM_DEBUG("Failed to lookup VMA\n");
 159                         ret = PTR_ERR(vma);
 160                         goto err;
 161                 }
 162
 163                 /* Transfer ownership from the objects list to the vmas list. */
 164                 list_add_tail(&vma->exec_list, &eb->vmas);
 165                 list_del_init(&obj->obj_exec_link);
 166
 167                 vma->exec_entry = &exec[i];
 168                 if (eb->and < 0) {
 169                         eb->lut[i] = vma;
 170                 } else {
 171                         uint32_t handle = args->flags & I915_EXEC_HANDLE_LUT ? i : exec[i].handle;
 172                         vma->exec_handle = handle;
 173                         hlist_add_head(&vma->exec_node,
 174                                        &eb->buckets[handle & eb->and]);
 175                 }
 176                 ++i;
 177         }
 178
 179         return 0;
 180
 181
 182 err:
 183         while (!list_empty(&objects)) {
 184                 obj = list_first_entry(&objects,
 185                                        struct drm_i915_gem_object,
 186                                        obj_exec_link);
 187                 list_del_init(&obj->obj_exec_link);
 188                 drm_gem_object_unreference(&obj->base);
 189         }
 190         /*
 191          * Objects already transfered to the vmas list will be unreferenced by
 192          * eb_destroy.
 193          */
 194
 195         return ret;
 196 }
 197
 198 static struct i915_vma *eb_get_vma(struct eb_vmas *eb, unsigned long handle)
 199 {
 200         if (eb->and < 0) {
 201                 if (handle >= -eb->and)
 202                         return NULL;
 203                 return eb->lut[handle];
 204         } else {
 205                 struct hlist_head *head;
 206                 struct hlist_node *node;
 207
 208                 head = &eb->buckets[handle & eb->and];
 209                 hlist_for_each(node, head) {
 210                         struct i915_vma *vma;
 211
 212                         vma = hlist_entry(node, struct i915_vma, exec_node);
 213                         if (vma->exec_handle == handle)
 214                                 return vma;
 215                 }
 216                 return NULL;
 217         }
 218 }
 219
 220 static void
 221 i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
 222 {
 223         struct drm_i915_gem_exec_object2 *entry;
 224         struct drm_i915_gem_object *obj = vma->obj;
 225
 226         if (!drm_mm_node_allocated(&vma->node))
 227                 return;
 228
 229         entry = vma->exec_entry;
 230
 231         if (entry->flags & __EXEC_OBJECT_HAS_FENCE)
 232                 i915_gem_object_unpin_fence(obj);
 233
 234         if (entry->flags & __EXEC_OBJECT_HAS_PIN)
 235                 vma->pin_count--;
 236
 237         entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
 238 }
 239
 240 static void eb_destroy(struct eb_vmas *eb)
 241 {
 242         while (!list_empty(&eb->vmas)) {
 243                 struct i915_vma *vma;
 244
 245                 vma = list_first_entry(&eb->vmas,
 246                                        struct i915_vma,
 247                                        exec_list);
 248                 list_del_init(&vma->exec_list);
 249                 i915_gem_execbuffer_unreserve_vma(vma);
 250                 drm_gem_object_unreference(&vma->obj->base);
 251         }
 252         kfree(eb);
 253 }
 254
 255 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 256 {
 257         return (HAS_LLC(obj->base.dev) ||
 258                 obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
 259                 !obj->map_and_fenceable ||
 260                 obj->cache_level != I915_CACHE_NONE);
 261 }
 262
 263 static int
 264 relocate_entry_cpu(struct drm_i915_gem_object *obj,
 265                    struct drm_i915_gem_relocation_entry *reloc)
 266 {
 267         struct drm_device *dev = obj->base.dev;
 268         uint32_t page_offset = offset_in_page(reloc->offset);
 269         char *vaddr;
 270         int ret;
 271
 272         ret = i915_gem_object_set_to_cpu_domain(obj, true);
 273         if (ret)
 274                 return ret;
 275
 276         vaddr = kmap_atomic(i915_gem_object_get_page(obj,
 277                                 reloc->offset >> PAGE_SHIFT));
 278         *(uint32_t *)(vaddr + page_offset) = reloc->delta;
 279
 280         if (INTEL_INFO(dev)->gen >= 8) {
 281                 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
 282
 283                 if (page_offset == 0) {
 284                         kunmap_atomic(vaddr);
 285                         vaddr = kmap_atomic(i915_gem_object_get_page(obj,
 286                             (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
 287                 }
 288
 289                 *(uint32_t *)(vaddr + page_offset) = 0;
 290         }
 291
 292         kunmap_atomic(vaddr);
 293
 294         return 0;
 295 }
 296
 297 static int
 298 relocate_entry_gtt(struct drm_i915_gem_object *obj,
 299                    struct drm_i915_gem_relocation_entry *reloc)
 300 {
 301         struct drm_device *dev = obj->base.dev;
 302         struct drm_i915_private *dev_priv = dev->dev_private;
 303         uint32_t __iomem *reloc_entry;
 304         void __iomem *reloc_page;
 305         int ret;
 306
 307         ret = i915_gem_object_set_to_gtt_domain(obj, true);
 308         if (ret)
 309                 return ret;
 310
 311         ret = i915_gem_object_put_fence(obj);
 312         if (ret)
 313                 return ret;
 314
 315         /* Map the page containing the relocation we're going to perform.  */
 316         reloc->offset += i915_gem_obj_ggtt_offset(obj);
 317         reloc_page = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 318                         reloc->offset & PAGE_MASK);
 319         reloc_entry = (uint32_t __iomem *)
 320                 (reloc_page + offset_in_page(reloc->offset));
 321         iowrite32(reloc->delta, reloc_entry);
 322
 323         if (INTEL_INFO(dev)->gen >= 8) {
 324                 reloc_entry += 1;
 325
 326                 if (offset_in_page(reloc->offset + sizeof(uint32_t)) == 0) {
 327                         io_mapping_unmap_atomic(reloc_page);
 328                         reloc_page = io_mapping_map_atomic_wc(
 329                                         dev_priv->gtt.mappable,
 330                                         reloc->offset + sizeof(uint32_t));
 331                         reloc_entry = reloc_page;
 332                 }
 333
 334                 iowrite32(0, reloc_entry);
 335         }
 336
 337         io_mapping_unmap_atomic(reloc_page);
 338
 339         return 0;
 340 }
 341
 342 static int
 343 i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
 344                                    struct eb_vmas *eb,
 345                                    struct drm_i915_gem_relocation_entry *reloc)
 346 {
 347         struct drm_device *dev = obj->base.dev;
 348         struct drm_gem_object *target_obj;
 349         struct drm_i915_gem_object *target_i915_obj;
 350         struct i915_vma *target_vma;
 351         uint32_t target_offset;
 352         int ret;
 353
 354         /* we've already hold a reference to all valid objects */
 355         target_vma = eb_get_vma(eb, reloc->target_handle);
 356         if (unlikely(target_vma == NULL))
 357                 return -ENOENT;
 358         target_i915_obj = target_vma->obj;
 359         target_obj = &target_vma->obj->base;
 360
 361         target_offset = target_vma->node.start;
 362
 363         /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
 364          * pipe_control writes because the gpu doesn't properly redirect them
 365          * through the ppgtt for non_secure batchbuffers. */
 366         if (unlikely(IS_GEN6(dev) &&
 367             reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION &&
 368             !target_i915_obj->has_global_gtt_mapping)) {
 369                 struct i915_vma *vma =
 370                         list_first_entry(&target_i915_obj->vma_list,
 371                                          typeof(*vma), vma_link);
 372                 vma->bind_vma(vma, target_i915_obj->cache_level, GLOBAL_BIND);
 373         }
 374
 375         /* Validate that the target is in a valid r/w GPU domain */
 376         if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
 377                 DRM_DEBUG("reloc with multiple write domains: "
 378                           "obj %p target %d offset %d "
 379                           "read %08x write %08x",
 380                           obj, reloc->target_handle,
 381                           (int) reloc->offset,
 382                           reloc->read_domains,
 383                           reloc->write_domain);
 384                 return -EINVAL;
 385         }
 386         if (unlikely((reloc->write_domain | reloc->read_domains)
 387                      & ~I915_GEM_GPU_DOMAINS)) {
 388                 DRM_DEBUG("reloc with read/write non-GPU domains: "
 389                           "obj %p target %d offset %d "
 390                           "read %08x write %08x",
 391                           obj, reloc->target_handle,
 392                           (int) reloc->offset,
 393                           reloc->read_domains,
 394                           reloc->write_domain);
 395                 return -EINVAL;
 396         }
 397
 398         target_obj->pending_read_domains |= reloc->read_domains;
 399         target_obj->pending_write_domain |= reloc->write_domain;
 400
 401         /* If the relocation already has the right value in it, no
 402          * more work needs to be done.
 403          */
 404         if (target_offset == reloc->presumed_offset)
 405                 return 0;
 406
 407         /* Check that the relocation address is valid... */
 408         if (unlikely(reloc->offset >
 409                 obj->base.size - (INTEL_INFO(dev)->gen >= 8 ? 8 : 4))) {
 410                 DRM_DEBUG("Relocation beyond object bounds: "
 411                           "obj %p target %d offset %d size %d.\n",
 412                           obj, reloc->target_handle,
 413                           (int) reloc->offset,
 414                           (int) obj->base.size);
 415                 return -EINVAL;
 416         }
 417         if (unlikely(reloc->offset & 3)) {
 418                 DRM_DEBUG("Relocation not 4-byte aligned: "
 419                           "obj %p target %d offset %d.\n",
 420                           obj, reloc->target_handle,
 421                           (int) reloc->offset);
 422                 return -EINVAL;
 423         }
 424
 425         /* We can't wait for rendering with pagefaults disabled */
 426         if (obj->active && in_atomic())
 427                 return -EFAULT;
 428
 429         reloc->delta += target_offset;
 430         if (use_cpu_reloc(obj))
 431                 ret = relocate_entry_cpu(obj, reloc);
 432         else
 433                 ret = relocate_entry_gtt(obj, reloc);
 434
 435         if (ret)
 436                 return ret;
 437
 438         /* and update the user's relocation entry */
 439         reloc->presumed_offset = target_offset;
 440
 441         return 0;
 442 }
 443
 444 static int
 445 i915_gem_execbuffer_relocate_vma(struct i915_vma *vma,
 446                                  struct eb_vmas *eb)
 447 {
 448 #define N_RELOC(x) ((x) / sizeof(struct drm_i915_gem_relocation_entry))
 449         struct drm_i915_gem_relocation_entry stack_reloc[N_RELOC(512)];
 450         struct drm_i915_gem_relocation_entry __user *user_relocs;
 451         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 452         int remain, ret;
 453
 454         user_relocs = to_user_ptr(entry->relocs_ptr);
 455
 456         remain = entry->relocation_count;
 457         while (remain) {
 458                 struct drm_i915_gem_relocation_entry *r = stack_reloc;
 459                 int count = remain;
 460                 if (count > ARRAY_SIZE(stack_reloc))
 461                         count = ARRAY_SIZE(stack_reloc);
 462                 remain -= count;
 463
 464                 if (__copy_from_user_inatomic(r, user_relocs, count*sizeof(r[0])))
 465                         return -EFAULT;
 466
 467                 do {
 468                         u64 offset = r->presumed_offset;
 469
 470                         ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, r);
 471                         if (ret)
 472                                 return ret;
 473
 474                         if (r->presumed_offset != offset &&
 475                             __copy_to_user_inatomic(&user_relocs->presumed_offset,
 476                                                     &r->presumed_offset,
 477                                                     sizeof(r->presumed_offset))) {
 478                                 return -EFAULT;
 479                         }
 480
 481                         user_relocs++;
 482                         r++;
 483                 } while (--count);
 484         }
 485
 486         return 0;
 487 #undef N_RELOC
 488 }
 489
 490 static int
 491 i915_gem_execbuffer_relocate_vma_slow(struct i915_vma *vma,
 492                                       struct eb_vmas *eb,
 493                                       struct drm_i915_gem_relocation_entry *relocs)
 494 {
 495         const struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 496         int i, ret;
 497
 498         for (i = 0; i < entry->relocation_count; i++) {
 499                 ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, &relocs[i]);
 500                 if (ret)
 501                         return ret;
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int
 508 i915_gem_execbuffer_relocate(struct eb_vmas *eb)
 509 {
 510         struct i915_vma *vma;
 511         int ret = 0;
 512
 513         /* This is the fast path and we cannot handle a pagefault whilst
 514          * holding the struct mutex lest the user pass in the relocations
 515          * contained within a mmaped bo. For in such a case we, the page
 516          * fault handler would call i915_gem_fault() and we would try to
 517          * acquire the struct mutex again. Obviously this is bad and so
 518          * lockdep complains vehemently.
 519          */
 520         pagefault_disable();
 521         list_for_each_entry(vma, &eb->vmas, exec_list) {
 522                 ret = i915_gem_execbuffer_relocate_vma(vma, eb);
 523                 if (ret)
 524                         break;
 525         }
 526         pagefault_enable();
 527
 528         return ret;
 529 }
 530
 531 static int
 532 need_reloc_mappable(struct i915_vma *vma)
 533 {
 534         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 535         return entry->relocation_count && !use_cpu_reloc(vma->obj) &&
 536                 i915_is_ggtt(vma->vm);
 537 }
 538
 539 static int
 540 i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
 541                                 struct intel_ring_buffer *ring,
 542                                 bool *need_reloc)
 543 {
 544         struct drm_i915_gem_object *obj = vma->obj;
 545         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 546         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 547         bool need_fence;
 548         unsigned flags;
 549         int ret;
 550
 551         flags = 0;
 552
 553         need_fence =
 554                 has_fenced_gpu_access &&
 555                 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 556                 obj->tiling_mode != I915_TILING_NONE;
 557         if (need_fence || need_reloc_mappable(vma))
 558                 flags |= PIN_MAPPABLE;
 559
 560         if (entry->flags & EXEC_OBJECT_NEEDS_GTT)
 561                 flags |= PIN_GLOBAL;
 562
 563         ret = i915_gem_object_pin(obj, vma->vm, entry->alignment, flags);
 564         if (ret)
 565                 return ret;
 566
 567         entry->flags |= __EXEC_OBJECT_HAS_PIN;
 568
 569         if (has_fenced_gpu_access) {
 570                 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
 571                         ret = i915_gem_object_get_fence(obj);
 572                         if (ret)
 573                                 return ret;
 574
 575                         if (i915_gem_object_pin_fence(obj))
 576                                 entry->flags |= __EXEC_OBJECT_HAS_FENCE;
 577
 578                         obj->pending_fenced_gpu_access = true;
 579                 }
 580         }
 581
 582         if (entry->offset != vma->node.start) {
 583                 entry->offset = vma->node.start;
 584                 *need_reloc = true;
 585         }
 586
 587         if (entry->flags & EXEC_OBJECT_WRITE) {
 588                 obj->base.pending_read_domains = I915_GEM_DOMAIN_RENDER;
 589                 obj->base.pending_write_domain = I915_GEM_DOMAIN_RENDER;
 590         }
 591
 592         return 0;
 593 }
 594
 595 static int
 596 i915_gem_execbuffer_reserve(struct intel_ring_buffer *ring,
 597                             struct list_head *vmas,
 598                             bool *need_relocs)
 599 {
 600         struct drm_i915_gem_object *obj;
 601         struct i915_vma *vma;
 602         struct i915_address_space *vm;
 603         struct list_head ordered_vmas;
 604         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 605         int retry;
 606
 607         if (list_empty(vmas))
 608                 return 0;
 609
 610         vm = list_first_entry(vmas, struct i915_vma, exec_list)->vm;
 611
 612         INIT_LIST_HEAD(&ordered_vmas);
 613         while (!list_empty(vmas)) {
 614                 struct drm_i915_gem_exec_object2 *entry;
 615                 bool need_fence, need_mappable;
 616
 617                 vma = list_first_entry(vmas, struct i915_vma, exec_list);
 618                 obj = vma->obj;
 619                 entry = vma->exec_entry;
 620
 621                 need_fence =
 622                         has_fenced_gpu_access &&
 623                         entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 624                         obj->tiling_mode != I915_TILING_NONE;
 625                 need_mappable = need_fence || need_reloc_mappable(vma);
 626
 627                 if (need_mappable)
 628                         list_move(&vma->exec_list, &ordered_vmas);
 629                 else
 630                         list_move_tail(&vma->exec_list, &ordered_vmas);
 631
 632                 obj->base.pending_read_domains = I915_GEM_GPU_DOMAINS & ~I915_GEM_DOMAIN_COMMAND;
 633                 obj->base.pending_write_domain = 0;
 634                 obj->pending_fenced_gpu_access = false;
 635         }
 636         list_splice(&ordered_vmas, vmas);
 637
 638         /* Attempt to pin all of the buffers into the GTT.
 639          * This is done in 3 phases:
 640          *
 641          * 1a. Unbind all objects that do not match the GTT constraints for
 642          *     the execbuffer (fenceable, mappable, alignment etc).
 643          * 1b. Increment pin count for already bound objects.
 644          * 2.  Bind new objects.
 645          * 3.  Decrement pin count.
 646          *
 647          * This avoid unnecessary unbinding of later objects in order to make
 648          * room for the earlier objects *unless* we need to defragment.
 649          */
 650         retry = 0;
 651         do {
 652                 int ret = 0;
 653
 654                 /* Unbind any ill-fitting objects or pin. */
 655                 list_for_each_entry(vma, vmas, exec_list) {
 656                         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 657                         bool need_fence, need_mappable;
 658
 659                         obj = vma->obj;
 660
 661                         if (!drm_mm_node_allocated(&vma->node))
 662                                 continue;
 663
 664                         need_fence =
 665                                 has_fenced_gpu_access &&
 666                                 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 667                                 obj->tiling_mode != I915_TILING_NONE;
 668                         need_mappable = need_fence || need_reloc_mappable(vma);
 669
 670                         WARN_ON((need_mappable || need_fence) &&
 671                                !i915_is_ggtt(vma->vm));
 672
 673                         if ((entry->alignment &&
 674                              vma->node.start & (entry->alignment - 1)) ||
 675                             (need_mappable && !obj->map_and_fenceable))
 676                                 ret = i915_vma_unbind(vma);
 677                         else
 678                                 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 679                         if (ret)
 680                                 goto err;
 681                 }
 682
 683                 /* Bind fresh objects */
 684                 list_for_each_entry(vma, vmas, exec_list) {
 685                         if (drm_mm_node_allocated(&vma->node))
 686                                 continue;
 687
 688                         ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 689                         if (ret)
 690                                 goto err;
 691                 }
 692
 693 err:
 694                 if (ret != -ENOSPC || retry++)
 695                         return ret;
 696
 697                 /* Decrement pin count for bound objects */
 698                 list_for_each_entry(vma, vmas, exec_list)
 699                         i915_gem_execbuffer_unreserve_vma(vma);
 700
 701                 ret = i915_gem_evict_vm(vm, true);
 702                 if (ret)
 703                         return ret;
 704         } while (1);
 705 }
 706
 707 static int
 708 i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
 709                                   struct drm_i915_gem_execbuffer2 *args,
 710                                   struct drm_file *file,
 711                                   struct intel_ring_buffer *ring,
 712                                   struct eb_vmas *eb,
 713                                   struct drm_i915_gem_exec_object2 *exec)
 714 {
 715         struct drm_i915_gem_relocation_entry *reloc;
 716         struct i915_address_space *vm;
 717         struct i915_vma *vma;
 718         bool need_relocs;
 719         int *reloc_offset;
 720         int i, total, ret;
 721         unsigned count = args->buffer_count;
 722
 723         if (WARN_ON(list_empty(&eb->vmas)))
 724                 return 0;
 725
 726         vm = list_first_entry(&eb->vmas, struct i915_vma, exec_list)->vm;
 727
 728         /* We may process another execbuffer during the unlock... */
 729         while (!list_empty(&eb->vmas)) {
 730                 vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
 731                 list_del_init(&vma->exec_list);
 732                 i915_gem_execbuffer_unreserve_vma(vma);
 733                 drm_gem_object_unreference(&vma->obj->base);
 734         }
 735
 736         mutex_unlock(&dev->struct_mutex);
 737
 738         total = 0;
 739         for (i = 0; i < count; i++)
 740                 total += exec[i].relocation_count;
 741
 742         reloc_offset = drm_malloc_ab(count, sizeof(*reloc_offset));
 743         reloc = drm_malloc_ab(total, sizeof(*reloc));
 744         if (reloc == NULL || reloc_offset == NULL) {
 745                 drm_free_large(reloc);
 746                 drm_free_large(reloc_offset);
 747                 mutex_lock(&dev->struct_mutex);
 748                 return -ENOMEM;
 749         }
 750
 751         total = 0;
 752         for (i = 0; i < count; i++) {
 753                 struct drm_i915_gem_relocation_entry __user *user_relocs;
 754                 u64 invalid_offset = (u64)-1;
 755                 int j;
 756
 757                 user_relocs = to_user_ptr(exec[i].relocs_ptr);
 758
 759                 if (copy_from_user(reloc+total, user_relocs,
 760                                    exec[i].relocation_count * sizeof(*reloc))) {
 761                         ret = -EFAULT;
 762                         mutex_lock(&dev->struct_mutex);
 763                         goto err;
 764                 }
 765
 766                 /* As we do not update the known relocation offsets after
 767                  * relocating (due to the complexities in lock handling),
 768                  * we need to mark them as invalid now so that we force the
 769                  * relocation processing next time. Just in case the target
 770                  * object is evicted and then rebound into its old
 771                  * presumed_offset before the next execbuffer - if that
 772                  * happened we would make the mistake of assuming that the
 773                  * relocations were valid.
 774                  */
 775                 for (j = 0; j < exec[i].relocation_count; j++) {
 776                         if (copy_to_user(&user_relocs[j].presumed_offset,
 777                                          &invalid_offset,
 778                                          sizeof(invalid_offset))) {
 779                                 ret = -EFAULT;
 780                                 mutex_lock(&dev->struct_mutex);
 781                                 goto err;
 782                         }
 783                 }
 784
 785                 reloc_offset[i] = total;
 786                 total += exec[i].relocation_count;
 787         }
 788
 789         ret = i915_mutex_lock_interruptible(dev);
 790         if (ret) {
 791                 mutex_lock(&dev->struct_mutex);
 792                 goto err;
 793         }
 794
 795         /* reacquire the objects */
 796         eb_reset(eb);
 797         ret = eb_lookup_vmas(eb, exec, args, vm, file);
 798         if (ret)
 799                 goto err;
 800
 801         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
 802         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
 803         if (ret)
 804                 goto err;
 805
 806         list_for_each_entry(vma, &eb->vmas, exec_list) {
 807                 int offset = vma->exec_entry - exec;
 808                 ret = i915_gem_execbuffer_relocate_vma_slow(vma, eb,
 809                                                             reloc + reloc_offset[offset]);
 810                 if (ret)
 811                         goto err;
 812         }
 813
 814         /* Leave the user relocations as are, this is the painfully slow path,
 815          * and we want to avoid the complication of dropping the lock whilst
 816          * having buffers reserved in the aperture and so causing spurious
 817          * ENOSPC for random operations.
 818          */
 819
 820 err:
 821         drm_free_large(reloc);
 822         drm_free_large(reloc_offset);
 823         return ret;
 824 }
 825
 826 static int
 827 i915_gem_execbuffer_move_to_gpu(struct intel_ring_buffer *ring,
 828                                 struct list_head *vmas)
 829 {
 830         struct i915_vma *vma;
 831         uint32_t flush_domains = 0;
 832         bool flush_chipset = false;
 833         int ret;
 834
 835         list_for_each_entry(vma, vmas, exec_list) {
 836                 struct drm_i915_gem_object *obj = vma->obj;
 837                 ret = i915_gem_object_sync(obj, ring);
 838                 if (ret)
 839                         return ret;
 840
 841                 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
 842                         flush_chipset |= i915_gem_clflush_object(obj, false);
 843
 844                 flush_domains |= obj->base.write_domain;
 845         }
 846
 847         if (flush_chipset)
 848                 i915_gem_chipset_flush(ring->dev);
 849
 850         if (flush_domains & I915_GEM_DOMAIN_GTT)
 851                 wmb();
 852
 853         /* Unconditionally invalidate gpu caches and ensure that we do flush
 854          * any residual writes from the previous batch.
 855          */
 856         return intel_ring_invalidate_all_caches(ring);
 857 }
 858
 859 static bool
 860 i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
 861 {
 862         if (exec->flags & __I915_EXEC_UNKNOWN_FLAGS)
 863                 return false;
 864
 865         return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
 866 }
 867
 868 static int
 869 validate_exec_list(struct drm_i915_gem_exec_object2 *exec,
 870                    int count)
 871 {
 872         int i;
 873         unsigned relocs_total = 0;
 874         unsigned relocs_max = UINT_MAX / sizeof(struct drm_i915_gem_relocation_entry);
 875
 876         for (i = 0; i < count; i++) {
 877                 char __user *ptr = to_user_ptr(exec[i].relocs_ptr);
 878                 int length; /* limited by fault_in_pages_readable() */
 879
 880                 if (exec[i].flags & __EXEC_OBJECT_UNKNOWN_FLAGS)
 881                         return -EINVAL;
 882
 883                 /* First check for malicious input causing overflow in
 884                  * the worst case where we need to allocate the entire
 885                  * relocation tree as a single array.
 886                  */
 887                 if (exec[i].relocation_count > relocs_max - relocs_total)
 888                         return -EINVAL;
 889                 relocs_total += exec[i].relocation_count;
 890
 891                 length = exec[i].relocation_count *
 892                         sizeof(struct drm_i915_gem_relocation_entry);
 893                 /*
 894                  * We must check that the entire relocation array is safe
 895                  * to read, but since we may need to update the presumed
 896                  * offsets during execution, check for full write access.
 897                  */
 898                 if (!access_ok(VERIFY_WRITE, ptr, length))
 899                         return -EFAULT;
 900
 901                 if (likely(!i915.prefault_disable)) {
 902                         if (fault_in_multipages_readable(ptr, length))
 903                                 return -EFAULT;
 904                 }
 905         }
 906
 907         return 0;
 908 }
 909
 910 static struct i915_hw_context *
 911 i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
 912                           struct intel_ring_buffer *ring, const u32 ctx_id)
 913 {
 914         struct i915_hw_context *ctx = NULL;
 915         struct i915_ctx_hang_stats *hs;
 916
 917         if (ring->id != RCS && ctx_id != DEFAULT_CONTEXT_ID)
 918                 return ERR_PTR(-EINVAL);
 919
 920         ctx = i915_gem_context_get(file->driver_priv, ctx_id);
 921         if (IS_ERR(ctx))
 922                 return ctx;
 923
 924         hs = &ctx->hang_stats;
 925         if (hs->banned) {
 926                 DRM_DEBUG("Context %u tried to submit while banned\n", ctx_id);
 927                 return ERR_PTR(-EIO);
 928         }
 929
 930         return ctx;
 931 }
 932
 933 static void
 934 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 935                                    struct intel_ring_buffer *ring)
 936 {
 937         struct i915_vma *vma;
 938
 939         list_for_each_entry(vma, vmas, exec_list) {
 940                 struct drm_i915_gem_object *obj = vma->obj;
 941                 u32 old_read = obj->base.read_domains;
 942                 u32 old_write = obj->base.write_domain;
 943
 944                 obj->base.write_domain = obj->base.pending_write_domain;
 945                 if (obj->base.write_domain == 0)
 946                         obj->base.pending_read_domains |= obj->base.read_domains;
 947                 obj->base.read_domains = obj->base.pending_read_domains;
 948                 obj->fenced_gpu_access = obj->pending_fenced_gpu_access;
 949
 950                 i915_vma_move_to_active(vma, ring);
 951                 if (obj->base.write_domain) {
 952                         obj->dirty = 1;
 953                         obj->last_write_seqno = intel_ring_get_seqno(ring);
 954                         /* check for potential scanout */
 955                         if (i915_gem_obj_ggtt_bound(obj) &&
 956                             i915_gem_obj_to_ggtt(obj)->pin_count)
 957                                 intel_mark_fb_busy(obj, ring);
 958                 }
 959
 960                 trace_i915_gem_object_change_domain(obj, old_read, old_write);
 961         }
 962 }
 963
 964 static void
 965 i915_gem_execbuffer_retire_commands(struct drm_device *dev,
 966                                     struct drm_file *file,
 967                                     struct intel_ring_buffer *ring,
 968                                     struct drm_i915_gem_object *obj)
 969 {
 970         /* Unconditionally force add_request to emit a full flush. */
 971         ring->gpu_caches_dirty = true;
 972
 973         /* Add a breadcrumb for the completion of the batch buffer */
 974         (void)__i915_add_request(ring, file, obj, NULL);
 975 }
 976
 977 static int
 978 i915_reset_gen7_sol_offsets(struct drm_device *dev,
 979                             struct intel_ring_buffer *ring)
 980 {
 981         drm_i915_private_t *dev_priv = dev->dev_private;
 982         int ret, i;
 983
 984         if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS])
 985                 return 0;
 986
 987         ret = intel_ring_begin(ring, 4 * 3);
 988         if (ret)
 989                 return ret;
 990
 991         for (i = 0; i < 4; i++) {
 992                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
 993                 intel_ring_emit(ring, GEN7_SO_WRITE_OFFSET(i));
 994                 intel_ring_emit(ring, 0);
 995         }
 996
 997         intel_ring_advance(ring);
 998
 999         return 0;
1000 }
1001
1002 static int
1003 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
1004                        struct drm_file *file,
1005                        struct drm_i915_gem_execbuffer2 *args,
1006                        struct drm_i915_gem_exec_object2 *exec)
1007 {
1008         drm_i915_private_t *dev_priv = dev->dev_private;
1009         struct eb_vmas *eb;
1010         struct drm_i915_gem_object *batch_obj;
1011         struct drm_clip_rect *cliprects = NULL;
1012         struct intel_ring_buffer *ring;
1013         struct i915_hw_context *ctx;
1014         struct i915_address_space *vm;
1015         const u32 ctx_id = i915_execbuffer2_get_context_id(*args);
1016         u32 exec_start = args->batch_start_offset, exec_len;
1017         u32 mask, flags;
1018         int ret, mode, i;
1019         bool need_relocs;
1020
1021         if (!i915_gem_check_execbuffer(args))
1022                 return -EINVAL;
1023
1024         ret = validate_exec_list(exec, args->buffer_count);
1025         if (ret)
1026                 return ret;
1027
1028         flags = 0;
1029         if (args->flags & I915_EXEC_SECURE) {
1030                 if (!file->is_master || !capable(CAP_SYS_ADMIN))
1031                     return -EPERM;
1032
1033                 flags |= I915_DISPATCH_SECURE;
1034         }
1035         if (args->flags & I915_EXEC_IS_PINNED)
1036                 flags |= I915_DISPATCH_PINNED;
1037
1038         if ((args->flags & I915_EXEC_RING_MASK) > I915_NUM_RINGS) {
1039                 DRM_DEBUG("execbuf with unknown ring: %d\n",
1040                           (int)(args->flags & I915_EXEC_RING_MASK));
1041                 return -EINVAL;
1042         }
1043
1044         if ((args->flags & I915_EXEC_RING_MASK) == I915_EXEC_DEFAULT)
1045                 ring = &dev_priv->ring[RCS];
1046         else
1047                 ring = &dev_priv->ring[(args->flags & I915_EXEC_RING_MASK) - 1];
1048
1049         if (!intel_ring_initialized(ring)) {
1050                 DRM_DEBUG("execbuf with invalid ring: %d\n",
1051                           (int)(args->flags & I915_EXEC_RING_MASK));
1052                 return -EINVAL;
1053         }
1054
1055         mode = args->flags & I915_EXEC_CONSTANTS_MASK;
1056         mask = I915_EXEC_CONSTANTS_MASK;
1057         switch (mode) {
1058         case I915_EXEC_CONSTANTS_REL_GENERAL:
1059         case I915_EXEC_CONSTANTS_ABSOLUTE:
1060         case I915_EXEC_CONSTANTS_REL_SURFACE:
1061                 if (ring == &dev_priv->ring[RCS] &&
1062                     mode != dev_priv->relative_constants_mode) {
1063                         if (INTEL_INFO(dev)->gen < 4)
1064                                 return -EINVAL;
1065
1066                         if (INTEL_INFO(dev)->gen > 5 &&
1067                             mode == I915_EXEC_CONSTANTS_REL_SURFACE)
1068                                 return -EINVAL;
1069
1070                         /* The HW changed the meaning on this bit on gen6 */
1071                         if (INTEL_INFO(dev)->gen >= 6)
1072                                 mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
1073                 }
1074                 break;
1075         default:
1076                 DRM_DEBUG("execbuf with unknown constants: %d\n", mode);
1077                 return -EINVAL;
1078         }
1079
1080         if (args->buffer_count < 1) {
1081                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1082                 return -EINVAL;
1083         }
1084
1085         if (args->num_cliprects != 0) {
1086                 if (ring != &dev_priv->ring[RCS]) {
1087                         DRM_DEBUG("clip rectangles are only valid with the render ring\n");
1088                         return -EINVAL;
1089                 }
1090
1091                 if (INTEL_INFO(dev)->gen >= 5) {
1092                         DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
1093                         return -EINVAL;
1094                 }
1095
1096                 if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) {
1097                         DRM_DEBUG("execbuf with %u cliprects\n",
1098                                   args->num_cliprects);
1099                         return -EINVAL;
1100                 }
1101
1102                 cliprects = kcalloc(args->num_cliprects,
1103                                     sizeof(*cliprects),
1104                                     GFP_KERNEL);
1105                 if (cliprects == NULL) {
1106                         ret = -ENOMEM;
1107                         goto pre_mutex_err;
1108                 }
1109
1110                 if (copy_from_user(cliprects,
1111                                    to_user_ptr(args->cliprects_ptr),
1112                                    sizeof(*cliprects)*args->num_cliprects)) {
1113                         ret = -EFAULT;
1114                         goto pre_mutex_err;
1115                 }
1116         }
1117
1118         intel_runtime_pm_get(dev_priv);
1119
1120         ret = i915_mutex_lock_interruptible(dev);
1121         if (ret)
1122                 goto pre_mutex_err;
1123
1124         if (dev_priv->ums.mm_suspended) {
1125                 mutex_unlock(&dev->struct_mutex);
1126                 ret = -EBUSY;
1127                 goto pre_mutex_err;
1128         }
1129
1130         ctx = i915_gem_validate_context(dev, file, ring, ctx_id);
1131         if (IS_ERR(ctx)) {
1132                 mutex_unlock(&dev->struct_mutex);
1133                 ret = PTR_ERR(ctx);
1134                 goto pre_mutex_err;
1135         }
1136
1137         i915_gem_context_reference(ctx);
1138
1139         vm = ctx->vm;
1140         if (!USES_FULL_PPGTT(dev))
1141                 vm = &dev_priv->gtt.base;
1142
1143         eb = eb_create(args);
1144         if (eb == NULL) {
1145                 mutex_unlock(&dev->struct_mutex);
1146                 ret = -ENOMEM;
1147                 goto pre_mutex_err;
1148         }
1149
1150         /* Look up object handles */
1151         ret = eb_lookup_vmas(eb, exec, args, vm, file);
1152         if (ret)
1153                 goto err;
1154
1155         /* take note of the batch buffer before we might reorder the lists */
1156         batch_obj = list_entry(eb->vmas.prev, struct i915_vma, exec_list)->obj;
1157
1158         /* Move the objects en-masse into the GTT, evicting if necessary. */
1159         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
1160         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
1161         if (ret)
1162                 goto err;
1163
1164         /* The objects are in their final locations, apply the relocations. */
1165         if (need_relocs)
1166                 ret = i915_gem_execbuffer_relocate(eb);
1167         if (ret) {
1168                 if (ret == -EFAULT) {
1169                         ret = i915_gem_execbuffer_relocate_slow(dev, args, file, ring,
1170                                                                 eb, exec);
1171                         BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1172                 }
1173                 if (ret)
1174                         goto err;
1175         }
1176
1177         /* Set the pending read domains for the batch buffer to COMMAND */
1178         if (batch_obj->base.pending_write_domain) {
1179                 DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
1180                 ret = -EINVAL;
1181                 goto err;
1182         }
1183         batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
1184
1185         if (i915_needs_cmd_parser(ring)) {
1186                 ret = i915_parse_cmds(ring,
1187                                       batch_obj,
1188                                       args->batch_start_offset,
1189                                       file->is_master);
1190                 if (ret)
1191                         goto err;
1192
1193                 /*
1194                  * XXX: Actually do this when enabling batch copy...
1195                  *
1196                  * Set the DISPATCH_SECURE bit to remove the NON_SECURE bit
1197                  * from MI_BATCH_BUFFER_START commands issued in the
1198                  * dispatch_execbuffer implementations. We specifically don't
1199                  * want that set when the command parser is enabled.
1200                  */
1201         }
1202
1203         /* snb/ivb/vlv conflate the "batch in ppgtt" bit with the "non-secure
1204          * batch" bit. Hence we need to pin secure batches into the global gtt.
1205          * hsw should have this fixed, but bdw mucks it up again. */
1206         if (flags & I915_DISPATCH_SECURE &&
1207             !batch_obj->has_global_gtt_mapping) {
1208                 /* When we have multiple VMs, we'll need to make sure that we
1209                  * allocate space first */
1210                 struct i915_vma *vma = i915_gem_obj_to_ggtt(batch_obj);
1211                 BUG_ON(!vma);
1212                 vma->bind_vma(vma, batch_obj->cache_level, GLOBAL_BIND);
1213         }
1214
1215         if (flags & I915_DISPATCH_SECURE)
1216                 exec_start += i915_gem_obj_ggtt_offset(batch_obj);
1217         else
1218                 exec_start += i915_gem_obj_offset(batch_obj, vm);
1219
1220         ret = i915_gem_execbuffer_move_to_gpu(ring, &eb->vmas);
1221         if (ret)
1222                 goto err;
1223
1224         ret = i915_switch_context(ring, file, ctx);
1225         if (ret)
1226                 goto err;
1227
1228         if (ring == &dev_priv->ring[RCS] &&
1229             mode != dev_priv->relative_constants_mode) {
1230                 ret = intel_ring_begin(ring, 4);
1231                 if (ret)
1232                                 goto err;
1233
1234                 intel_ring_emit(ring, MI_NOOP);
1235                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1236                 intel_ring_emit(ring, INSTPM);
1237                 intel_ring_emit(ring, mask << 16 | mode);
1238                 intel_ring_advance(ring);
1239
1240                 dev_priv->relative_constants_mode = mode;
1241         }
1242
1243         if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
1244                 ret = i915_reset_gen7_sol_offsets(dev, ring);
1245                 if (ret)
1246                         goto err;
1247         }
1248
1249
1250         exec_len = args->batch_len;
1251         if (cliprects) {
1252                 for (i = 0; i < args->num_cliprects; i++) {
1253                         ret = i915_emit_box(dev, &cliprects[i],
1254                                             args->DR1, args->DR4);
1255                         if (ret)
1256                                 goto err;
1257
1258                         ret = ring->dispatch_execbuffer(ring,
1259                                                         exec_start, exec_len,
1260                                                         flags);
1261                         if (ret)
1262                                 goto err;
1263                 }
1264         } else {
1265                 ret = ring->dispatch_execbuffer(ring,
1266                                                 exec_start, exec_len,
1267                                                 flags);
1268                 if (ret)
1269                         goto err;
1270         }
1271
1272         trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags);
1273
1274         i915_gem_execbuffer_move_to_active(&eb->vmas, ring);
1275         i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
1276
1277 err:
1278         /* the request owns the ref now */
1279         i915_gem_context_unreference(ctx);
1280         eb_destroy(eb);
1281
1282         mutex_unlock(&dev->struct_mutex);
1283
1284 pre_mutex_err:
1285         kfree(cliprects);
1286
1287         /* intel_gpu_busy should also get a ref, so it will free when the device
1288          * is really idle. */
1289         intel_runtime_pm_put(dev_priv);
1290         return ret;
1291 }
1292
1293 /*
1294  * Legacy execbuffer just creates an exec2 list from the original exec object
1295  * list array and passes it to the real function.
1296  */
1297 int
1298 i915_gem_execbuffer(struct drm_device *dev, void *data,
1299                     struct drm_file *file)
1300 {
1301         struct drm_i915_gem_execbuffer *args = data;
1302         struct drm_i915_gem_execbuffer2 exec2;
1303         struct drm_i915_gem_exec_object *exec_list = NULL;
1304         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1305         int ret, i;
1306
1307         if (args->buffer_count < 1) {
1308                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1309                 return -EINVAL;
1310         }
1311
1312         /* Copy in the exec list from userland */
1313         exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
1314         exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
1315         if (exec_list == NULL || exec2_list == NULL) {
1316                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1317                           args->buffer_count);
1318                 drm_free_large(exec_list);
1319                 drm_free_large(exec2_list);
1320                 return -ENOMEM;
1321         }
1322         ret = copy_from_user(exec_list,
1323                              to_user_ptr(args->buffers_ptr),
1324                              sizeof(*exec_list) * args->buffer_count);
1325         if (ret != 0) {
1326                 DRM_DEBUG("copy %d exec entries failed %d\n",
1327                           args->buffer_count, ret);
1328                 drm_free_large(exec_list);
1329                 drm_free_large(exec2_list);
1330                 return -EFAULT;
1331         }
1332
1333         for (i = 0; i < args->buffer_count; i++) {
1334                 exec2_list[i].handle = exec_list[i].handle;
1335                 exec2_list[i].relocation_count = exec_list[i].relocation_count;
1336                 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
1337                 exec2_list[i].alignment = exec_list[i].alignment;
1338                 exec2_list[i].offset = exec_list[i].offset;
1339                 if (INTEL_INFO(dev)->gen < 4)
1340                         exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
1341                 else
1342                         exec2_list[i].flags = 0;
1343         }
1344
1345         exec2.buffers_ptr = args->buffers_ptr;
1346         exec2.buffer_count = args->buffer_count;
1347         exec2.batch_start_offset = args->batch_start_offset;
1348         exec2.batch_len = args->batch_len;
1349         exec2.DR1 = args->DR1;
1350         exec2.DR4 = args->DR4;
1351         exec2.num_cliprects = args->num_cliprects;
1352         exec2.cliprects_ptr = args->cliprects_ptr;
1353         exec2.flags = I915_EXEC_RENDER;
1354         i915_execbuffer2_set_context_id(exec2, 0);
1355
1356         ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
1357         if (!ret) {
1358                 /* Copy the new buffer offsets back to the user's exec list. */
1359                 for (i = 0; i < args->buffer_count; i++)
1360                         exec_list[i].offset = exec2_list[i].offset;
1361                 /* ... and back out to userspace */
1362                 ret = copy_to_user(to_user_ptr(args->buffers_ptr),
1363                                    exec_list,
1364                                    sizeof(*exec_list) * args->buffer_count);
1365                 if (ret) {
1366                         ret = -EFAULT;
1367                         DRM_DEBUG("failed to copy %d exec entries "
1368                                   "back to user (%d)\n",
1369                                   args->buffer_count, ret);
1370                 }
1371         }
1372
1373         drm_free_large(exec_list);
1374         drm_free_large(exec2_list);
1375         return ret;
1376 }
1377
1378 int
1379 i915_gem_execbuffer2(struct drm_device *dev, void *data,
1380                      struct drm_file *file)
1381 {
1382         struct drm_i915_gem_execbuffer2 *args = data;
1383         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1384         int ret;
1385
1386         if (args->buffer_count < 1 ||
1387             args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
1388                 DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
1389                 return -EINVAL;
1390         }
1391
1392         exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count,
1393                              GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
1394         if (exec2_list == NULL)
1395                 exec2_list = drm_malloc_ab(sizeof(*exec2_list),
1396                                            args->buffer_count);
1397         if (exec2_list == NULL) {
1398                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1399                           args->buffer_count);
1400                 return -ENOMEM;
1401         }
1402         ret = copy_from_user(exec2_list,
1403                              to_user_ptr(args->buffers_ptr),
1404                              sizeof(*exec2_list) * args->buffer_count);
1405         if (ret != 0) {
1406                 DRM_DEBUG("copy %d exec entries failed %d\n",
1407                           args->buffer_count, ret);
1408                 drm_free_large(exec2_list);
1409                 return -EFAULT;
1410         }
1411
1412         ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list);
1413         if (!ret) {
1414                 /* Copy the new buffer offsets back to the user's exec list. */
1415                 ret = copy_to_user(to_user_ptr(args->buffers_ptr),
1416                                    exec2_list,
1417                                    sizeof(*exec2_list) * args->buffer_count);
1418                 if (ret) {
1419                         ret = -EFAULT;
1420                         DRM_DEBUG("failed to copy %d exec entries "
1421                                   "back to user (%d)\n",
1422                                   args->buffer_count, ret);
1423                 }
1424         }
1425
1426         drm_free_large(exec2_list);
1427         return ret;
1428 }