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 #define  __EXEC_OBJECT_NEEDS_MAP (1<<29)
  39 #define  __EXEC_OBJECT_NEEDS_BIAS (1<<28)
  40
  41 #define BATCH_OFFSET_BIAS (256*1024)
  42
  43 struct eb_vmas {
  44         struct list_head vmas;
  45         int and;
  46         union {
  47                 struct i915_vma *lut[0];
  48                 struct hlist_head buckets[0];
  49         };
  50 };
  51
  52 static struct eb_vmas *
  53 eb_create(struct drm_i915_gem_execbuffer2 *args)
  54 {
  55         struct eb_vmas *eb = NULL;
  56
  57         if (args->flags & I915_EXEC_HANDLE_LUT) {
  58                 unsigned size = args->buffer_count;
  59                 size *= sizeof(struct i915_vma *);
  60                 size += sizeof(struct eb_vmas);
  61                 eb = kmalloc(size, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  62         }
  63
  64         if (eb == NULL) {
  65                 unsigned size = args->buffer_count;
  66                 unsigned count = PAGE_SIZE / sizeof(struct hlist_head) / 2;
  67                 BUILD_BUG_ON_NOT_POWER_OF_2(PAGE_SIZE / sizeof(struct hlist_head));
  68                 while (count > 2*size)
  69                         count >>= 1;
  70                 eb = kzalloc(count*sizeof(struct hlist_head) +
  71                              sizeof(struct eb_vmas),
  72                              GFP_TEMPORARY);
  73                 if (eb == NULL)
  74                         return eb;
  75
  76                 eb->and = count - 1;
  77         } else
  78                 eb->and = -args->buffer_count;
  79
  80         INIT_LIST_HEAD(&eb->vmas);
  81         return eb;
  82 }
  83
  84 static void
  85 eb_reset(struct eb_vmas *eb)
  86 {
  87         if (eb->and >= 0)
  88                 memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
  89 }
  90
  91 static int
  92 eb_lookup_vmas(struct eb_vmas *eb,
  93                struct drm_i915_gem_exec_object2 *exec,
  94                const struct drm_i915_gem_execbuffer2 *args,
  95                struct i915_address_space *vm,
  96                struct drm_file *file)
  97 {
  98         struct drm_i915_gem_object *obj;
  99         struct list_head objects;
 100         int i, ret;
 101
 102         INIT_LIST_HEAD(&objects);
 103         spin_lock(&file->table_lock);
 104         /* Grab a reference to the object and release the lock so we can lookup
 105          * or create the VMA without using GFP_ATOMIC */
 106         for (i = 0; i < args->buffer_count; i++) {
 107                 obj = to_intel_bo(idr_find(&file->object_idr, exec[i].handle));
 108                 if (obj == NULL) {
 109                         spin_unlock(&file->table_lock);
 110                         DRM_DEBUG("Invalid object handle %d at index %d\n",
 111                                    exec[i].handle, i);
 112                         ret = -ENOENT;
 113                         goto err;
 114                 }
 115
 116                 if (!list_empty(&obj->obj_exec_link)) {
 117                         spin_unlock(&file->table_lock);
 118                         DRM_DEBUG("Object %p [handle %d, index %d] appears more than once in object list\n",
 119                                    obj, exec[i].handle, i);
 120                         ret = -EINVAL;
 121                         goto err;
 122                 }
 123
 124                 WARN_ONCE(obj->base.dumb,
 125                           "GPU use of dumb buffer is illegal.\n");
 126
 127                 drm_gem_object_reference(&obj->base);
 128                 list_add_tail(&obj->obj_exec_link, &objects);
 129         }
 130         spin_unlock(&file->table_lock);
 131
 132         i = 0;
 133         while (!list_empty(&objects)) {
 134                 struct i915_vma *vma;
 135
 136                 obj = list_first_entry(&objects,
 137                                        struct drm_i915_gem_object,
 138                                        obj_exec_link);
 139
 140                 /*
 141                  * NOTE: We can leak any vmas created here when something fails
 142                  * later on. But that's no issue since vma_unbind can deal with
 143                  * vmas which are not actually bound. And since only
 144                  * lookup_or_create exists as an interface to get at the vma
 145                  * from the (obj, vm) we don't run the risk of creating
 146                  * duplicated vmas for the same vm.
 147                  */
 148                 vma = i915_gem_obj_lookup_or_create_vma(obj, vm);
 149                 if (IS_ERR(vma)) {
 150                         DRM_DEBUG("Failed to lookup VMA\n");
 151                         ret = PTR_ERR(vma);
 152                         goto err;
 153                 }
 154
 155                 /* Transfer ownership from the objects list to the vmas list. */
 156                 list_add_tail(&vma->exec_list, &eb->vmas);
 157                 list_del_init(&obj->obj_exec_link);
 158
 159                 vma->exec_entry = &exec[i];
 160                 if (eb->and < 0) {
 161                         eb->lut[i] = vma;
 162                 } else {
 163                         uint32_t handle = args->flags & I915_EXEC_HANDLE_LUT ? i : exec[i].handle;
 164                         vma->exec_handle = handle;
 165                         hlist_add_head(&vma->exec_node,
 166                                        &eb->buckets[handle & eb->and]);
 167                 }
 168                 ++i;
 169         }
 170
 171         return 0;
 172
 173
 174 err:
 175         while (!list_empty(&objects)) {
 176                 obj = list_first_entry(&objects,
 177                                        struct drm_i915_gem_object,
 178                                        obj_exec_link);
 179                 list_del_init(&obj->obj_exec_link);
 180                 drm_gem_object_unreference(&obj->base);
 181         }
 182         /*
 183          * Objects already transfered to the vmas list will be unreferenced by
 184          * eb_destroy.
 185          */
 186
 187         return ret;
 188 }
 189
 190 static struct i915_vma *eb_get_vma(struct eb_vmas *eb, unsigned long handle)
 191 {
 192         if (eb->and < 0) {
 193                 if (handle >= -eb->and)
 194                         return NULL;
 195                 return eb->lut[handle];
 196         } else {
 197                 struct hlist_head *head;
 198                 struct hlist_node *node;
 199
 200                 head = &eb->buckets[handle & eb->and];
 201                 hlist_for_each(node, head) {
 202                         struct i915_vma *vma;
 203
 204                         vma = hlist_entry(node, struct i915_vma, exec_node);
 205                         if (vma->exec_handle == handle)
 206                                 return vma;
 207                 }
 208                 return NULL;
 209         }
 210 }
 211
 212 static void
 213 i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
 214 {
 215         struct drm_i915_gem_exec_object2 *entry;
 216         struct drm_i915_gem_object *obj = vma->obj;
 217
 218         if (!drm_mm_node_allocated(&vma->node))
 219                 return;
 220
 221         entry = vma->exec_entry;
 222
 223         if (entry->flags & __EXEC_OBJECT_HAS_FENCE)
 224                 i915_gem_object_unpin_fence(obj);
 225
 226         if (entry->flags & __EXEC_OBJECT_HAS_PIN)
 227                 vma->pin_count--;
 228
 229         entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
 230 }
 231
 232 static void eb_destroy(struct eb_vmas *eb)
 233 {
 234         while (!list_empty(&eb->vmas)) {
 235                 struct i915_vma *vma;
 236
 237                 vma = list_first_entry(&eb->vmas,
 238                                        struct i915_vma,
 239                                        exec_list);
 240                 list_del_init(&vma->exec_list);
 241                 i915_gem_execbuffer_unreserve_vma(vma);
 242                 drm_gem_object_unreference(&vma->obj->base);
 243         }
 244         kfree(eb);
 245 }
 246
 247 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 248 {
 249         return (HAS_LLC(obj->base.dev) ||
 250                 obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
 251                 !obj->map_and_fenceable ||
 252                 obj->cache_level != I915_CACHE_NONE);
 253 }
 254
 255 static int
 256 relocate_entry_cpu(struct drm_i915_gem_object *obj,
 257                    struct drm_i915_gem_relocation_entry *reloc,
 258                    uint64_t target_offset)
 259 {
 260         struct drm_device *dev = obj->base.dev;
 261         uint32_t page_offset = offset_in_page(reloc->offset);
 262         uint64_t delta = reloc->delta + target_offset;
 263         char *vaddr;
 264         int ret;
 265
 266         ret = i915_gem_object_set_to_cpu_domain(obj, true);
 267         if (ret)
 268                 return ret;
 269
 270         vaddr = kmap_atomic(i915_gem_object_get_page(obj,
 271                                 reloc->offset >> PAGE_SHIFT));
 272         *(uint32_t *)(vaddr + page_offset) = lower_32_bits(delta);
 273
 274         if (INTEL_INFO(dev)->gen >= 8) {
 275                 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
 276
 277                 if (page_offset == 0) {
 278                         kunmap_atomic(vaddr);
 279                         vaddr = kmap_atomic(i915_gem_object_get_page(obj,
 280                             (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
 281                 }
 282
 283                 *(uint32_t *)(vaddr + page_offset) = upper_32_bits(delta);
 284         }
 285
 286         kunmap_atomic(vaddr);
 287
 288         return 0;
 289 }
 290
 291 static int
 292 relocate_entry_gtt(struct drm_i915_gem_object *obj,
 293                    struct drm_i915_gem_relocation_entry *reloc,
 294                    uint64_t target_offset)
 295 {
 296         struct drm_device *dev = obj->base.dev;
 297         struct drm_i915_private *dev_priv = dev->dev_private;
 298         uint64_t delta = reloc->delta + target_offset;
 299         uint64_t offset;
 300         void __iomem *reloc_page;
 301         int ret;
 302
 303         ret = i915_gem_object_set_to_gtt_domain(obj, true);
 304         if (ret)
 305                 return ret;
 306
 307         ret = i915_gem_object_put_fence(obj);
 308         if (ret)
 309                 return ret;
 310
 311         /* Map the page containing the relocation we're going to perform.  */
 312         offset = i915_gem_obj_ggtt_offset(obj);
 313         offset += reloc->offset;
 314         reloc_page = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 315                                               offset & PAGE_MASK);
 316         iowrite32(lower_32_bits(delta), reloc_page + offset_in_page(offset));
 317
 318         if (INTEL_INFO(dev)->gen >= 8) {
 319                 offset += sizeof(uint32_t);
 320
 321                 if (offset_in_page(offset) == 0) {
 322                         io_mapping_unmap_atomic(reloc_page);
 323                         reloc_page =
 324                                 io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 325                                                          offset);
 326                 }
 327
 328                 iowrite32(upper_32_bits(delta),
 329                           reloc_page + offset_in_page(offset));
 330         }
 331
 332         io_mapping_unmap_atomic(reloc_page);
 333
 334         return 0;
 335 }
 336
 337 static int
 338 i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
 339                                    struct eb_vmas *eb,
 340                                    struct drm_i915_gem_relocation_entry *reloc)
 341 {
 342         struct drm_device *dev = obj->base.dev;
 343         struct drm_gem_object *target_obj;
 344         struct drm_i915_gem_object *target_i915_obj;
 345         struct i915_vma *target_vma;
 346         uint64_t target_offset;
 347         int ret;
 348
 349         /* we've already hold a reference to all valid objects */
 350         target_vma = eb_get_vma(eb, reloc->target_handle);
 351         if (unlikely(target_vma == NULL))
 352                 return -ENOENT;
 353         target_i915_obj = target_vma->obj;
 354         target_obj = &target_vma->obj->base;
 355
 356         target_offset = target_vma->node.start;
 357
 358         /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
 359          * pipe_control writes because the gpu doesn't properly redirect them
 360          * through the ppgtt for non_secure batchbuffers. */
 361         if (unlikely(IS_GEN6(dev) &&
 362             reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION &&
 363             !(target_vma->bound & GLOBAL_BIND)))
 364                 target_vma->bind_vma(target_vma, target_i915_obj->cache_level,
 365                                 GLOBAL_BIND);
 366
 367         /* Validate that the target is in a valid r/w GPU domain */
 368         if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
 369                 DRM_DEBUG("reloc with multiple write domains: "
 370                           "obj %p target %d offset %d "
 371                           "read %08x write %08x",
 372                           obj, reloc->target_handle,
 373                           (int) reloc->offset,
 374                           reloc->read_domains,
 375                           reloc->write_domain);
 376                 return -EINVAL;
 377         }
 378         if (unlikely((reloc->write_domain | reloc->read_domains)
 379                      & ~I915_GEM_GPU_DOMAINS)) {
 380                 DRM_DEBUG("reloc with read/write non-GPU domains: "
 381                           "obj %p target %d offset %d "
 382                           "read %08x write %08x",
 383                           obj, reloc->target_handle,
 384                           (int) reloc->offset,
 385                           reloc->read_domains,
 386                           reloc->write_domain);
 387                 return -EINVAL;
 388         }
 389
 390         target_obj->pending_read_domains |= reloc->read_domains;
 391         target_obj->pending_write_domain |= reloc->write_domain;
 392
 393         /* If the relocation already has the right value in it, no
 394          * more work needs to be done.
 395          */
 396         if (target_offset == reloc->presumed_offset)
 397                 return 0;
 398
 399         /* Check that the relocation address is valid... */
 400         if (unlikely(reloc->offset >
 401                 obj->base.size - (INTEL_INFO(dev)->gen >= 8 ? 8 : 4))) {
 402                 DRM_DEBUG("Relocation beyond object bounds: "
 403                           "obj %p target %d offset %d size %d.\n",
 404                           obj, reloc->target_handle,
 405                           (int) reloc->offset,
 406                           (int) obj->base.size);
 407                 return -EINVAL;
 408         }
 409         if (unlikely(reloc->offset & 3)) {
 410                 DRM_DEBUG("Relocation not 4-byte aligned: "
 411                           "obj %p target %d offset %d.\n",
 412                           obj, reloc->target_handle,
 413                           (int) reloc->offset);
 414                 return -EINVAL;
 415         }
 416
 417         /* We can't wait for rendering with pagefaults disabled */
 418         if (obj->active && in_atomic())
 419                 return -EFAULT;
 420
 421         if (use_cpu_reloc(obj))
 422                 ret = relocate_entry_cpu(obj, reloc, target_offset);
 423         else
 424                 ret = relocate_entry_gtt(obj, reloc, target_offset);
 425
 426         if (ret)
 427                 return ret;
 428
 429         /* and update the user's relocation entry */
 430         reloc->presumed_offset = target_offset;
 431
 432         return 0;
 433 }
 434
 435 static int
 436 i915_gem_execbuffer_relocate_vma(struct i915_vma *vma,
 437                                  struct eb_vmas *eb)
 438 {
 439 #define N_RELOC(x) ((x) / sizeof(struct drm_i915_gem_relocation_entry))
 440         struct drm_i915_gem_relocation_entry stack_reloc[N_RELOC(512)];
 441         struct drm_i915_gem_relocation_entry __user *user_relocs;
 442         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 443         int remain, ret;
 444
 445         user_relocs = to_user_ptr(entry->relocs_ptr);
 446
 447         remain = entry->relocation_count;
 448         while (remain) {
 449                 struct drm_i915_gem_relocation_entry *r = stack_reloc;
 450                 int count = remain;
 451                 if (count > ARRAY_SIZE(stack_reloc))
 452                         count = ARRAY_SIZE(stack_reloc);
 453                 remain -= count;
 454
 455                 if (__copy_from_user_inatomic(r, user_relocs, count*sizeof(r[0])))
 456                         return -EFAULT;
 457
 458                 do {
 459                         u64 offset = r->presumed_offset;
 460
 461                         ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, r);
 462                         if (ret)
 463                                 return ret;
 464
 465                         if (r->presumed_offset != offset &&
 466                             __copy_to_user_inatomic(&user_relocs->presumed_offset,
 467                                                     &r->presumed_offset,
 468                                                     sizeof(r->presumed_offset))) {
 469                                 return -EFAULT;
 470                         }
 471
 472                         user_relocs++;
 473                         r++;
 474                 } while (--count);
 475         }
 476
 477         return 0;
 478 #undef N_RELOC
 479 }
 480
 481 static int
 482 i915_gem_execbuffer_relocate_vma_slow(struct i915_vma *vma,
 483                                       struct eb_vmas *eb,
 484                                       struct drm_i915_gem_relocation_entry *relocs)
 485 {
 486         const struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 487         int i, ret;
 488
 489         for (i = 0; i < entry->relocation_count; i++) {
 490                 ret = i915_gem_execbuffer_relocate_entry(vma->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 eb_vmas *eb)
 500 {
 501         struct i915_vma *vma;
 502         int ret = 0;
 503
 504         /* This is the fast path and we cannot handle a pagefault whilst
 505          * holding the struct mutex lest the user pass in the relocations
 506          * contained within a mmaped bo. For in such a case we, the page
 507          * fault handler would call i915_gem_fault() and we would try to
 508          * acquire the struct mutex again. Obviously this is bad and so
 509          * lockdep complains vehemently.
 510          */
 511         pagefault_disable();
 512         list_for_each_entry(vma, &eb->vmas, exec_list) {
 513                 ret = i915_gem_execbuffer_relocate_vma(vma, eb);
 514                 if (ret)
 515                         break;
 516         }
 517         pagefault_enable();
 518
 519         return ret;
 520 }
 521
 522 static int
 523 i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
 524                                 struct intel_engine_cs *ring,
 525                                 bool *need_reloc)
 526 {
 527         struct drm_i915_gem_object *obj = vma->obj;
 528         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 529         uint64_t flags;
 530         int ret;
 531
 532         flags = 0;
 533         if (entry->flags & __EXEC_OBJECT_NEEDS_MAP)
 534                 flags |= PIN_GLOBAL | PIN_MAPPABLE;
 535         if (entry->flags & EXEC_OBJECT_NEEDS_GTT)
 536                 flags |= PIN_GLOBAL;
 537         if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS)
 538                 flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
 539
 540         ret = i915_gem_object_pin(obj, vma->vm, entry->alignment, flags);
 541         if (ret)
 542                 return ret;
 543
 544         entry->flags |= __EXEC_OBJECT_HAS_PIN;
 545
 546         if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
 547                 ret = i915_gem_object_get_fence(obj);
 548                 if (ret)
 549                         return ret;
 550
 551                 if (i915_gem_object_pin_fence(obj))
 552                         entry->flags |= __EXEC_OBJECT_HAS_FENCE;
 553         }
 554
 555         if (entry->offset != vma->node.start) {
 556                 entry->offset = vma->node.start;
 557                 *need_reloc = true;
 558         }
 559
 560         if (entry->flags & EXEC_OBJECT_WRITE) {
 561                 obj->base.pending_read_domains = I915_GEM_DOMAIN_RENDER;
 562                 obj->base.pending_write_domain = I915_GEM_DOMAIN_RENDER;
 563         }
 564
 565         return 0;
 566 }
 567
 568 static bool
 569 need_reloc_mappable(struct i915_vma *vma)
 570 {
 571         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 572
 573         if (entry->relocation_count == 0)
 574                 return false;
 575
 576         if (!i915_is_ggtt(vma->vm))
 577                 return false;
 578
 579         /* See also use_cpu_reloc() */
 580         if (HAS_LLC(vma->obj->base.dev))
 581                 return false;
 582
 583         if (vma->obj->base.write_domain == I915_GEM_DOMAIN_CPU)
 584                 return false;
 585
 586         return true;
 587 }
 588
 589 static bool
 590 eb_vma_misplaced(struct i915_vma *vma)
 591 {
 592         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 593         struct drm_i915_gem_object *obj = vma->obj;
 594
 595         WARN_ON(entry->flags & __EXEC_OBJECT_NEEDS_MAP &&
 596                !i915_is_ggtt(vma->vm));
 597
 598         if (entry->alignment &&
 599             vma->node.start & (entry->alignment - 1))
 600                 return true;
 601
 602         if (entry->flags & __EXEC_OBJECT_NEEDS_MAP && !obj->map_and_fenceable)
 603                 return true;
 604
 605         if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS &&
 606             vma->node.start < BATCH_OFFSET_BIAS)
 607                 return true;
 608
 609         return false;
 610 }
 611
 612 static int
 613 i915_gem_execbuffer_reserve(struct intel_engine_cs *ring,
 614                             struct list_head *vmas,
 615                             bool *need_relocs)
 616 {
 617         struct drm_i915_gem_object *obj;
 618         struct i915_vma *vma;
 619         struct i915_address_space *vm;
 620         struct list_head ordered_vmas;
 621         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 622         int retry;
 623
 624         i915_gem_retire_requests_ring(ring);
 625
 626         vm = list_first_entry(vmas, struct i915_vma, exec_list)->vm;
 627
 628         INIT_LIST_HEAD(&ordered_vmas);
 629         while (!list_empty(vmas)) {
 630                 struct drm_i915_gem_exec_object2 *entry;
 631                 bool need_fence, need_mappable;
 632
 633                 vma = list_first_entry(vmas, struct i915_vma, exec_list);
 634                 obj = vma->obj;
 635                 entry = vma->exec_entry;
 636
 637                 if (!has_fenced_gpu_access)
 638                         entry->flags &= ~EXEC_OBJECT_NEEDS_FENCE;
 639                 need_fence =
 640                         entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 641                         obj->tiling_mode != I915_TILING_NONE;
 642                 need_mappable = need_fence || need_reloc_mappable(vma);
 643
 644                 if (need_mappable) {
 645                         entry->flags |= __EXEC_OBJECT_NEEDS_MAP;
 646                         list_move(&vma->exec_list, &ordered_vmas);
 647                 } else
 648                         list_move_tail(&vma->exec_list, &ordered_vmas);
 649
 650                 obj->base.pending_read_domains = I915_GEM_GPU_DOMAINS & ~I915_GEM_DOMAIN_COMMAND;
 651                 obj->base.pending_write_domain = 0;
 652         }
 653         list_splice(&ordered_vmas, vmas);
 654
 655         /* Attempt to pin all of the buffers into the GTT.
 656          * This is done in 3 phases:
 657          *
 658          * 1a. Unbind all objects that do not match the GTT constraints for
 659          *     the execbuffer (fenceable, mappable, alignment etc).
 660          * 1b. Increment pin count for already bound objects.
 661          * 2.  Bind new objects.
 662          * 3.  Decrement pin count.
 663          *
 664          * This avoid unnecessary unbinding of later objects in order to make
 665          * room for the earlier objects *unless* we need to defragment.
 666          */
 667         retry = 0;
 668         do {
 669                 int ret = 0;
 670
 671                 /* Unbind any ill-fitting objects or pin. */
 672                 list_for_each_entry(vma, vmas, exec_list) {
 673                         if (!drm_mm_node_allocated(&vma->node))
 674                                 continue;
 675
 676                         if (eb_vma_misplaced(vma))
 677                                 ret = i915_vma_unbind(vma);
 678                         else
 679                                 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 680                         if (ret)
 681                                 goto err;
 682                 }
 683
 684                 /* Bind fresh objects */
 685                 list_for_each_entry(vma, vmas, exec_list) {
 686                         if (drm_mm_node_allocated(&vma->node))
 687                                 continue;
 688
 689                         ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 690                         if (ret)
 691                                 goto err;
 692                 }
 693
 694 err:
 695                 if (ret != -ENOSPC || retry++)
 696                         return ret;
 697
 698                 /* Decrement pin count for bound objects */
 699                 list_for_each_entry(vma, vmas, exec_list)
 700                         i915_gem_execbuffer_unreserve_vma(vma);
 701
 702                 ret = i915_gem_evict_vm(vm, true);
 703                 if (ret)
 704                         return ret;
 705         } while (1);
 706 }
 707
 708 static int
 709 i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
 710                                   struct drm_i915_gem_execbuffer2 *args,
 711                                   struct drm_file *file,
 712                                   struct intel_engine_cs *ring,
 713                                   struct eb_vmas *eb,
 714                                   struct drm_i915_gem_exec_object2 *exec)
 715 {
 716         struct drm_i915_gem_relocation_entry *reloc;
 717         struct i915_address_space *vm;
 718         struct i915_vma *vma;
 719         bool need_relocs;
 720         int *reloc_offset;
 721         int i, total, ret;
 722         unsigned count = args->buffer_count;
 723
 724         vm = list_first_entry(&eb->vmas, struct i915_vma, exec_list)->vm;
 725
 726         /* We may process another execbuffer during the unlock... */
 727         while (!list_empty(&eb->vmas)) {
 728                 vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
 729                 list_del_init(&vma->exec_list);
 730                 i915_gem_execbuffer_unreserve_vma(vma);
 731                 drm_gem_object_unreference(&vma->obj->base);
 732         }
 733
 734         mutex_unlock(&dev->struct_mutex);
 735
 736         total = 0;
 737         for (i = 0; i < count; i++)
 738                 total += exec[i].relocation_count;
 739
 740         reloc_offset = drm_malloc_ab(count, sizeof(*reloc_offset));
 741         reloc = drm_malloc_ab(total, sizeof(*reloc));
 742         if (reloc == NULL || reloc_offset == NULL) {
 743                 drm_free_large(reloc);
 744                 drm_free_large(reloc_offset);
 745                 mutex_lock(&dev->struct_mutex);
 746                 return -ENOMEM;
 747         }
 748
 749         total = 0;
 750         for (i = 0; i < count; i++) {
 751                 struct drm_i915_gem_relocation_entry __user *user_relocs;
 752                 u64 invalid_offset = (u64)-1;
 753                 int j;
 754
 755                 user_relocs = to_user_ptr(exec[i].relocs_ptr);
 756
 757                 if (copy_from_user(reloc+total, user_relocs,
 758                                    exec[i].relocation_count * sizeof(*reloc))) {
 759                         ret = -EFAULT;
 760                         mutex_lock(&dev->struct_mutex);
 761                         goto err;
 762                 }
 763
 764                 /* As we do not update the known relocation offsets after
 765                  * relocating (due to the complexities in lock handling),
 766                  * we need to mark them as invalid now so that we force the
 767                  * relocation processing next time. Just in case the target
 768                  * object is evicted and then rebound into its old
 769                  * presumed_offset before the next execbuffer - if that
 770                  * happened we would make the mistake of assuming that the
 771                  * relocations were valid.
 772                  */
 773                 for (j = 0; j < exec[i].relocation_count; j++) {
 774                         if (__copy_to_user(&user_relocs[j].presumed_offset,
 775                                            &invalid_offset,
 776                                            sizeof(invalid_offset))) {
 777                                 ret = -EFAULT;
 778                                 mutex_lock(&dev->struct_mutex);
 779                                 goto err;
 780                         }
 781                 }
 782
 783                 reloc_offset[i] = total;
 784                 total += exec[i].relocation_count;
 785         }
 786
 787         ret = i915_mutex_lock_interruptible(dev);
 788         if (ret) {
 789                 mutex_lock(&dev->struct_mutex);
 790                 goto err;
 791         }
 792
 793         /* reacquire the objects */
 794         eb_reset(eb);
 795         ret = eb_lookup_vmas(eb, exec, args, vm, file);
 796         if (ret)
 797                 goto err;
 798
 799         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
 800         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
 801         if (ret)
 802                 goto err;
 803
 804         list_for_each_entry(vma, &eb->vmas, exec_list) {
 805                 int offset = vma->exec_entry - exec;
 806                 ret = i915_gem_execbuffer_relocate_vma_slow(vma, eb,
 807                                                             reloc + reloc_offset[offset]);
 808                 if (ret)
 809                         goto err;
 810         }
 811
 812         /* Leave the user relocations as are, this is the painfully slow path,
 813          * and we want to avoid the complication of dropping the lock whilst
 814          * having buffers reserved in the aperture and so causing spurious
 815          * ENOSPC for random operations.
 816          */
 817
 818 err:
 819         drm_free_large(reloc);
 820         drm_free_large(reloc_offset);
 821         return ret;
 822 }
 823
 824 static int
 825 i915_gem_execbuffer_move_to_gpu(struct intel_engine_cs *ring,
 826                                 struct list_head *vmas)
 827 {
 828         struct i915_vma *vma;
 829         uint32_t flush_domains = 0;
 830         bool flush_chipset = false;
 831         int ret;
 832
 833         list_for_each_entry(vma, vmas, exec_list) {
 834                 struct drm_i915_gem_object *obj = vma->obj;
 835                 ret = i915_gem_object_sync(obj, ring);
 836                 if (ret)
 837                         return ret;
 838
 839                 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
 840                         flush_chipset |= i915_gem_clflush_object(obj, false);
 841
 842                 flush_domains |= obj->base.write_domain;
 843         }
 844
 845         if (flush_chipset)
 846                 i915_gem_chipset_flush(ring->dev);
 847
 848         if (flush_domains & I915_GEM_DOMAIN_GTT)
 849                 wmb();
 850
 851         /* Unconditionally invalidate gpu caches and ensure that we do flush
 852          * any residual writes from the previous batch.
 853          */
 854         return intel_ring_invalidate_all_caches(ring);
 855 }
 856
 857 static bool
 858 i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
 859 {
 860         if (exec->flags & __I915_EXEC_UNKNOWN_FLAGS)
 861                 return false;
 862
 863         return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
 864 }
 865
 866 static int
 867 validate_exec_list(struct drm_device *dev,
 868                    struct drm_i915_gem_exec_object2 *exec,
 869                    int count)
 870 {
 871         unsigned relocs_total = 0;
 872         unsigned relocs_max = UINT_MAX / sizeof(struct drm_i915_gem_relocation_entry);
 873         unsigned invalid_flags;
 874         int i;
 875
 876         invalid_flags = __EXEC_OBJECT_UNKNOWN_FLAGS;
 877         if (USES_FULL_PPGTT(dev))
 878                 invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
 879
 880         for (i = 0; i < count; i++) {
 881                 char __user *ptr = to_user_ptr(exec[i].relocs_ptr);
 882                 int length; /* limited by fault_in_pages_readable() */
 883
 884                 if (exec[i].flags & invalid_flags)
 885                         return -EINVAL;
 886
 887                 /* First check for malicious input causing overflow in
 888                  * the worst case where we need to allocate the entire
 889                  * relocation tree as a single array.
 890                  */
 891                 if (exec[i].relocation_count > relocs_max - relocs_total)
 892                         return -EINVAL;
 893                 relocs_total += exec[i].relocation_count;
 894
 895                 length = exec[i].relocation_count *
 896                         sizeof(struct drm_i915_gem_relocation_entry);
 897                 /*
 898                  * We must check that the entire relocation array is safe
 899                  * to read, but since we may need to update the presumed
 900                  * offsets during execution, check for full write access.
 901                  */
 902                 if (!access_ok(VERIFY_WRITE, ptr, length))
 903                         return -EFAULT;
 904
 905                 if (likely(!i915.prefault_disable)) {
 906                         if (fault_in_multipages_readable(ptr, length))
 907                                 return -EFAULT;
 908                 }
 909         }
 910
 911         return 0;
 912 }
 913
 914 static struct intel_context *
 915 i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
 916                           struct intel_engine_cs *ring, const u32 ctx_id)
 917 {
 918         struct intel_context *ctx = NULL;
 919         struct i915_ctx_hang_stats *hs;
 920
 921         if (ring->id != RCS && ctx_id != DEFAULT_CONTEXT_HANDLE)
 922                 return ERR_PTR(-EINVAL);
 923
 924         ctx = i915_gem_context_get(file->driver_priv, ctx_id);
 925         if (IS_ERR(ctx))
 926                 return ctx;
 927
 928         hs = &ctx->hang_stats;
 929         if (hs->banned) {
 930                 DRM_DEBUG("Context %u tried to submit while banned\n", ctx_id);
 931                 return ERR_PTR(-EIO);
 932         }
 933
 934         if (i915.enable_execlists && !ctx->engine[ring->id].state) {
 935                 int ret = intel_lr_context_deferred_create(ctx, ring);
 936                 if (ret) {
 937                         DRM_DEBUG("Could not create LRC %u: %d\n", ctx_id, ret);
 938                         return ERR_PTR(ret);
 939                 }
 940         }
 941
 942         return ctx;
 943 }
 944
 945 void
 946 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 947                                    struct intel_engine_cs *ring)
 948 {
 949         u32 seqno = intel_ring_get_seqno(ring);
 950         struct i915_vma *vma;
 951
 952         list_for_each_entry(vma, vmas, exec_list) {
 953                 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 954                 struct drm_i915_gem_object *obj = vma->obj;
 955                 u32 old_read = obj->base.read_domains;
 956                 u32 old_write = obj->base.write_domain;
 957
 958                 obj->base.write_domain = obj->base.pending_write_domain;
 959                 if (obj->base.write_domain == 0)
 960                         obj->base.pending_read_domains |= obj->base.read_domains;
 961                 obj->base.read_domains = obj->base.pending_read_domains;
 962
 963                 i915_vma_move_to_active(vma, ring);
 964                 if (obj->base.write_domain) {
 965                         obj->dirty = 1;
 966                         obj->last_write_seqno = seqno;
 967
 968                         intel_fb_obj_invalidate(obj, ring);
 969
 970                         /* update for the implicit flush after a batch */
 971                         obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
 972                 }
 973                 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
 974                         obj->last_fenced_seqno = seqno;
 975                         if (entry->flags & __EXEC_OBJECT_HAS_FENCE) {
 976                                 struct drm_i915_private *dev_priv = to_i915(ring->dev);
 977                                 list_move_tail(&dev_priv->fence_regs[obj->fence_reg].lru_list,
 978                                                &dev_priv->mm.fence_list);
 979                         }
 980                 }
 981
 982                 trace_i915_gem_object_change_domain(obj, old_read, old_write);
 983         }
 984 }
 985
 986 void
 987 i915_gem_execbuffer_retire_commands(struct drm_device *dev,
 988                                     struct drm_file *file,
 989                                     struct intel_engine_cs *ring,
 990                                     struct drm_i915_gem_object *obj)
 991 {
 992         /* Unconditionally force add_request to emit a full flush. */
 993         ring->gpu_caches_dirty = true;
 994
 995         /* Add a breadcrumb for the completion of the batch buffer */
 996         (void)__i915_add_request(ring, file, obj, NULL);
 997 }
 998
 999 static int
1000 i915_reset_gen7_sol_offsets(struct drm_device *dev,
1001                             struct intel_engine_cs *ring)
1002 {
1003         struct drm_i915_private *dev_priv = dev->dev_private;
1004         int ret, i;
1005
1006         if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS]) {
1007                 DRM_DEBUG("sol reset is gen7/rcs only\n");
1008                 return -EINVAL;
1009         }
1010
1011         ret = intel_ring_begin(ring, 4 * 3);
1012         if (ret)
1013                 return ret;
1014
1015         for (i = 0; i < 4; i++) {
1016                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1017                 intel_ring_emit(ring, GEN7_SO_WRITE_OFFSET(i));
1018                 intel_ring_emit(ring, 0);
1019         }
1020
1021         intel_ring_advance(ring);
1022
1023         return 0;
1024 }
1025
1026 int
1027 i915_gem_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
1028                                struct intel_engine_cs *ring,
1029                                struct intel_context *ctx,
1030                                struct drm_i915_gem_execbuffer2 *args,
1031                                struct list_head *vmas,
1032                                struct drm_i915_gem_object *batch_obj,
1033                                u64 exec_start, u32 flags)
1034 {
1035         struct drm_clip_rect *cliprects = NULL;
1036         struct drm_i915_private *dev_priv = dev->dev_private;
1037         u64 exec_len;
1038         int instp_mode;
1039         u32 instp_mask;
1040         int i, ret = 0;
1041
1042         if (args->num_cliprects != 0) {
1043                 if (ring != &dev_priv->ring[RCS]) {
1044                         DRM_DEBUG("clip rectangles are only valid with the render ring\n");
1045                         return -EINVAL;
1046                 }
1047
1048                 if (INTEL_INFO(dev)->gen >= 5) {
1049                         DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
1050                         return -EINVAL;
1051                 }
1052
1053                 if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) {
1054                         DRM_DEBUG("execbuf with %u cliprects\n",
1055                                   args->num_cliprects);
1056                         return -EINVAL;
1057                 }
1058
1059                 cliprects = kcalloc(args->num_cliprects,
1060                                     sizeof(*cliprects),
1061                                     GFP_KERNEL);
1062                 if (cliprects == NULL) {
1063                         ret = -ENOMEM;
1064                         goto error;
1065                 }
1066
1067                 if (copy_from_user(cliprects,
1068                                    to_user_ptr(args->cliprects_ptr),
1069                                    sizeof(*cliprects)*args->num_cliprects)) {
1070                         ret = -EFAULT;
1071                         goto error;
1072                 }
1073         } else {
1074                 if (args->DR4 == 0xffffffff) {
1075                         DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
1076                         args->DR4 = 0;
1077                 }
1078
1079                 if (args->DR1 || args->DR4 || args->cliprects_ptr) {
1080                         DRM_DEBUG("0 cliprects but dirt in cliprects fields\n");
1081                         return -EINVAL;
1082                 }
1083         }
1084
1085         ret = i915_gem_execbuffer_move_to_gpu(ring, vmas);
1086         if (ret)
1087                 goto error;
1088
1089         ret = i915_switch_context(ring, ctx);
1090         if (ret)
1091                 goto error;
1092
1093         instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
1094         instp_mask = I915_EXEC_CONSTANTS_MASK;
1095         switch (instp_mode) {
1096         case I915_EXEC_CONSTANTS_REL_GENERAL:
1097         case I915_EXEC_CONSTANTS_ABSOLUTE:
1098         case I915_EXEC_CONSTANTS_REL_SURFACE:
1099                 if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
1100                         DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
1101                         ret = -EINVAL;
1102                         goto error;
1103                 }
1104
1105                 if (instp_mode != dev_priv->relative_constants_mode) {
1106                         if (INTEL_INFO(dev)->gen < 4) {
1107                                 DRM_DEBUG("no rel constants on pre-gen4\n");
1108                                 ret = -EINVAL;
1109                                 goto error;
1110                         }
1111
1112                         if (INTEL_INFO(dev)->gen > 5 &&
1113                             instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
1114                                 DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
1115                                 ret = -EINVAL;
1116                                 goto error;
1117                         }
1118
1119                         /* The HW changed the meaning on this bit on gen6 */
1120                         if (INTEL_INFO(dev)->gen >= 6)
1121                                 instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
1122                 }
1123                 break;
1124         default:
1125                 DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
1126                 ret = -EINVAL;
1127                 goto error;
1128         }
1129
1130         if (ring == &dev_priv->ring[RCS] &&
1131                         instp_mode != dev_priv->relative_constants_mode) {
1132                 ret = intel_ring_begin(ring, 4);
1133                 if (ret)
1134                         goto error;
1135
1136                 intel_ring_emit(ring, MI_NOOP);
1137                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1138                 intel_ring_emit(ring, INSTPM);
1139                 intel_ring_emit(ring, instp_mask << 16 | instp_mode);
1140                 intel_ring_advance(ring);
1141
1142                 dev_priv->relative_constants_mode = instp_mode;
1143         }
1144
1145         if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
1146                 ret = i915_reset_gen7_sol_offsets(dev, ring);
1147                 if (ret)
1148                         goto error;
1149         }
1150
1151         exec_len = args->batch_len;
1152         if (cliprects) {
1153                 for (i = 0; i < args->num_cliprects; i++) {
1154                         ret = i915_emit_box(dev, &cliprects[i],
1155                                             args->DR1, args->DR4);
1156                         if (ret)
1157                                 goto error;
1158
1159                         ret = ring->dispatch_execbuffer(ring,
1160                                                         exec_start, exec_len,
1161                                                         flags);
1162                         if (ret)
1163                                 goto error;
1164                 }
1165         } else {
1166                 ret = ring->dispatch_execbuffer(ring,
1167                                                 exec_start, exec_len,
1168                                                 flags);
1169                 if (ret)
1170                         return ret;
1171         }
1172
1173         trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags);
1174
1175         i915_gem_execbuffer_move_to_active(vmas, ring);
1176         i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
1177
1178 error:
1179         kfree(cliprects);
1180         return ret;
1181 }
1182
1183 /**
1184  * Find one BSD ring to dispatch the corresponding BSD command.
1185  * The Ring ID is returned.
1186  */
1187 static int gen8_dispatch_bsd_ring(struct drm_device *dev,
1188                                   struct drm_file *file)
1189 {
1190         struct drm_i915_private *dev_priv = dev->dev_private;
1191         struct drm_i915_file_private *file_priv = file->driver_priv;
1192
1193         /* Check whether the file_priv is using one ring */
1194         if (file_priv->bsd_ring)
1195                 return file_priv->bsd_ring->id;
1196         else {
1197                 /* If no, use the ping-pong mechanism to select one ring */
1198                 int ring_id;
1199
1200                 mutex_lock(&dev->struct_mutex);
1201                 if (dev_priv->mm.bsd_ring_dispatch_index == 0) {
1202                         ring_id = VCS;
1203                         dev_priv->mm.bsd_ring_dispatch_index = 1;
1204                 } else {
1205                         ring_id = VCS2;
1206                         dev_priv->mm.bsd_ring_dispatch_index = 0;
1207                 }
1208                 file_priv->bsd_ring = &dev_priv->ring[ring_id];
1209                 mutex_unlock(&dev->struct_mutex);
1210                 return ring_id;
1211         }
1212 }
1213
1214 static struct drm_i915_gem_object *
1215 eb_get_batch(struct eb_vmas *eb)
1216 {
1217         struct i915_vma *vma = list_entry(eb->vmas.prev, typeof(*vma), exec_list);
1218
1219         /*
1220          * SNA is doing fancy tricks with compressing batch buffers, which leads
1221          * to negative relocation deltas. Usually that works out ok since the
1222          * relocate address is still positive, except when the batch is placed
1223          * very low in the GTT. Ensure this doesn't happen.
1224          *
1225          * Note that actual hangs have only been observed on gen7, but for
1226          * paranoia do it everywhere.
1227          */
1228         vma->exec_entry->flags |= __EXEC_OBJECT_NEEDS_BIAS;
1229
1230         return vma->obj;
1231 }
1232
1233 static int
1234 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
1235                        struct drm_file *file,
1236                        struct drm_i915_gem_execbuffer2 *args,
1237                        struct drm_i915_gem_exec_object2 *exec)
1238 {
1239         struct drm_i915_private *dev_priv = dev->dev_private;
1240         struct eb_vmas *eb;
1241         struct drm_i915_gem_object *batch_obj;
1242         struct intel_engine_cs *ring;
1243         struct intel_context *ctx;
1244         struct i915_address_space *vm;
1245         const u32 ctx_id = i915_execbuffer2_get_context_id(*args);
1246         u64 exec_start = args->batch_start_offset;
1247         u32 flags;
1248         int ret;
1249         bool need_relocs;
1250
1251         if (!i915_gem_check_execbuffer(args))
1252                 return -EINVAL;
1253
1254         ret = validate_exec_list(dev, exec, args->buffer_count);
1255         if (ret)
1256                 return ret;
1257
1258         flags = 0;
1259         if (args->flags & I915_EXEC_SECURE) {
1260                 if (!file->is_master || !capable(CAP_SYS_ADMIN))
1261                     return -EPERM;
1262
1263                 flags |= I915_DISPATCH_SECURE;
1264         }
1265         if (args->flags & I915_EXEC_IS_PINNED)
1266                 flags |= I915_DISPATCH_PINNED;
1267
1268         if ((args->flags & I915_EXEC_RING_MASK) > LAST_USER_RING) {
1269                 DRM_DEBUG("execbuf with unknown ring: %d\n",
1270                           (int)(args->flags & I915_EXEC_RING_MASK));
1271                 return -EINVAL;
1272         }
1273
1274         if ((args->flags & I915_EXEC_RING_MASK) == I915_EXEC_DEFAULT)
1275                 ring = &dev_priv->ring[RCS];
1276         else if ((args->flags & I915_EXEC_RING_MASK) == I915_EXEC_BSD) {
1277                 if (HAS_BSD2(dev)) {
1278                         int ring_id;
1279                         ring_id = gen8_dispatch_bsd_ring(dev, file);
1280                         ring = &dev_priv->ring[ring_id];
1281                 } else
1282                         ring = &dev_priv->ring[VCS];
1283         } else
1284                 ring = &dev_priv->ring[(args->flags & I915_EXEC_RING_MASK) - 1];
1285
1286         if (!intel_ring_initialized(ring)) {
1287                 DRM_DEBUG("execbuf with invalid ring: %d\n",
1288                           (int)(args->flags & I915_EXEC_RING_MASK));
1289                 return -EINVAL;
1290         }
1291
1292         if (args->buffer_count < 1) {
1293                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1294                 return -EINVAL;
1295         }
1296
1297         intel_runtime_pm_get(dev_priv);
1298
1299         ret = i915_mutex_lock_interruptible(dev);
1300         if (ret)
1301                 goto pre_mutex_err;
1302
1303         if (dev_priv->ums.mm_suspended) {
1304                 mutex_unlock(&dev->struct_mutex);
1305                 ret = -EBUSY;
1306                 goto pre_mutex_err;
1307         }
1308
1309         ctx = i915_gem_validate_context(dev, file, ring, ctx_id);
1310         if (IS_ERR(ctx)) {
1311                 mutex_unlock(&dev->struct_mutex);
1312                 ret = PTR_ERR(ctx);
1313                 goto pre_mutex_err;
1314         }
1315
1316         i915_gem_context_reference(ctx);
1317
1318         if (ctx->ppgtt)
1319                 vm = &ctx->ppgtt->base;
1320         else
1321                 vm = &dev_priv->gtt.base;
1322
1323         eb = eb_create(args);
1324         if (eb == NULL) {
1325                 i915_gem_context_unreference(ctx);
1326                 mutex_unlock(&dev->struct_mutex);
1327                 ret = -ENOMEM;
1328                 goto pre_mutex_err;
1329         }
1330
1331         /* Look up object handles */
1332         ret = eb_lookup_vmas(eb, exec, args, vm, file);
1333         if (ret)
1334                 goto err;
1335
1336         /* take note of the batch buffer before we might reorder the lists */
1337         batch_obj = eb_get_batch(eb);
1338
1339         /* Move the objects en-masse into the GTT, evicting if necessary. */
1340         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
1341         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
1342         if (ret)
1343                 goto err;
1344
1345         /* The objects are in their final locations, apply the relocations. */
1346         if (need_relocs)
1347                 ret = i915_gem_execbuffer_relocate(eb);
1348         if (ret) {
1349                 if (ret == -EFAULT) {
1350                         ret = i915_gem_execbuffer_relocate_slow(dev, args, file, ring,
1351                                                                 eb, exec);
1352                         BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1353                 }
1354                 if (ret)
1355                         goto err;
1356         }
1357
1358         /* Set the pending read domains for the batch buffer to COMMAND */
1359         if (batch_obj->base.pending_write_domain) {
1360                 DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
1361                 ret = -EINVAL;
1362                 goto err;
1363         }
1364         batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
1365
1366         if (i915_needs_cmd_parser(ring)) {
1367                 ret = i915_parse_cmds(ring,
1368                                       batch_obj,
1369                                       args->batch_start_offset,
1370                                       file->is_master);
1371                 if (ret) {
1372                         if (ret != -EACCES)
1373                                 goto err;
1374                 } else {
1375                         /*
1376                          * XXX: Actually do this when enabling batch copy...
1377                          *
1378                          * Set the DISPATCH_SECURE bit to remove the NON_SECURE bit
1379                          * from MI_BATCH_BUFFER_START commands issued in the
1380                          * dispatch_execbuffer implementations. We specifically don't
1381                          * want that set when the command parser is enabled.
1382                          */
1383                 }
1384         }
1385
1386         /* snb/ivb/vlv conflate the "batch in ppgtt" bit with the "non-secure
1387          * batch" bit. Hence we need to pin secure batches into the global gtt.
1388          * hsw should have this fixed, but bdw mucks it up again. */
1389         if (flags & I915_DISPATCH_SECURE) {
1390                 /*
1391                  * So on first glance it looks freaky that we pin the batch here
1392                  * outside of the reservation loop. But:
1393                  * - The batch is already pinned into the relevant ppgtt, so we
1394                  *   already have the backing storage fully allocated.
1395                  * - No other BO uses the global gtt (well contexts, but meh),
1396                  *   so we don't really have issues with mutliple objects not
1397                  *   fitting due to fragmentation.
1398                  * So this is actually safe.
1399                  */
1400                 ret = i915_gem_obj_ggtt_pin(batch_obj, 0, 0);
1401                 if (ret)
1402                         goto err;
1403
1404                 exec_start += i915_gem_obj_ggtt_offset(batch_obj);
1405         } else
1406                 exec_start += i915_gem_obj_offset(batch_obj, vm);
1407
1408         ret = dev_priv->gt.do_execbuf(dev, file, ring, ctx, args,
1409                                       &eb->vmas, batch_obj, exec_start, flags);
1410
1411         /*
1412          * FIXME: We crucially rely upon the active tracking for the (ppgtt)
1413          * batch vma for correctness. For less ugly and less fragility this
1414          * needs to be adjusted to also track the ggtt batch vma properly as
1415          * active.
1416          */
1417         if (flags & I915_DISPATCH_SECURE)
1418                 i915_gem_object_ggtt_unpin(batch_obj);
1419 err:
1420         /* the request owns the ref now */
1421         i915_gem_context_unreference(ctx);
1422         eb_destroy(eb);
1423
1424         mutex_unlock(&dev->struct_mutex);
1425
1426 pre_mutex_err:
1427         /* intel_gpu_busy should also get a ref, so it will free when the device
1428          * is really idle. */
1429         intel_runtime_pm_put(dev_priv);
1430         return ret;
1431 }
1432
1433 /*
1434  * Legacy execbuffer just creates an exec2 list from the original exec object
1435  * list array and passes it to the real function.
1436  */
1437 int
1438 i915_gem_execbuffer(struct drm_device *dev, void *data,
1439                     struct drm_file *file)
1440 {
1441         struct drm_i915_gem_execbuffer *args = data;
1442         struct drm_i915_gem_execbuffer2 exec2;
1443         struct drm_i915_gem_exec_object *exec_list = NULL;
1444         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1445         int ret, i;
1446
1447         if (args->buffer_count < 1) {
1448                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1449                 return -EINVAL;
1450         }
1451
1452         /* Copy in the exec list from userland */
1453         exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
1454         exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
1455         if (exec_list == NULL || exec2_list == NULL) {
1456                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1457                           args->buffer_count);
1458                 drm_free_large(exec_list);
1459                 drm_free_large(exec2_list);
1460                 return -ENOMEM;
1461         }
1462         ret = copy_from_user(exec_list,
1463                              to_user_ptr(args->buffers_ptr),
1464                              sizeof(*exec_list) * args->buffer_count);
1465         if (ret != 0) {
1466                 DRM_DEBUG("copy %d exec entries failed %d\n",
1467                           args->buffer_count, ret);
1468                 drm_free_large(exec_list);
1469                 drm_free_large(exec2_list);
1470                 return -EFAULT;
1471         }
1472
1473         for (i = 0; i < args->buffer_count; i++) {
1474                 exec2_list[i].handle = exec_list[i].handle;
1475                 exec2_list[i].relocation_count = exec_list[i].relocation_count;
1476                 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
1477                 exec2_list[i].alignment = exec_list[i].alignment;
1478                 exec2_list[i].offset = exec_list[i].offset;
1479                 if (INTEL_INFO(dev)->gen < 4)
1480                         exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
1481                 else
1482                         exec2_list[i].flags = 0;
1483         }
1484
1485         exec2.buffers_ptr = args->buffers_ptr;
1486         exec2.buffer_count = args->buffer_count;
1487         exec2.batch_start_offset = args->batch_start_offset;
1488         exec2.batch_len = args->batch_len;
1489         exec2.DR1 = args->DR1;
1490         exec2.DR4 = args->DR4;
1491         exec2.num_cliprects = args->num_cliprects;
1492         exec2.cliprects_ptr = args->cliprects_ptr;
1493         exec2.flags = I915_EXEC_RENDER;
1494         i915_execbuffer2_set_context_id(exec2, 0);
1495
1496         ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
1497         if (!ret) {
1498                 struct drm_i915_gem_exec_object __user *user_exec_list =
1499                         to_user_ptr(args->buffers_ptr);
1500
1501                 /* Copy the new buffer offsets back to the user's exec list. */
1502                 for (i = 0; i < args->buffer_count; i++) {
1503                         ret = __copy_to_user(&user_exec_list[i].offset,
1504                                              &exec2_list[i].offset,
1505                                              sizeof(user_exec_list[i].offset));
1506                         if (ret) {
1507                                 ret = -EFAULT;
1508                                 DRM_DEBUG("failed to copy %d exec entries "
1509                                           "back to user (%d)\n",
1510                                           args->buffer_count, ret);
1511                                 break;
1512                         }
1513                 }
1514         }
1515
1516         drm_free_large(exec_list);
1517         drm_free_large(exec2_list);
1518         return ret;
1519 }
1520
1521 int
1522 i915_gem_execbuffer2(struct drm_device *dev, void *data,
1523                      struct drm_file *file)
1524 {
1525         struct drm_i915_gem_execbuffer2 *args = data;
1526         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1527         int ret;
1528
1529         if (args->buffer_count < 1 ||
1530             args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
1531                 DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
1532                 return -EINVAL;
1533         }
1534
1535         if (args->rsvd2 != 0) {
1536                 DRM_DEBUG("dirty rvsd2 field\n");
1537                 return -EINVAL;
1538         }
1539
1540         exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count,
1541                              GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
1542         if (exec2_list == NULL)
1543                 exec2_list = drm_malloc_ab(sizeof(*exec2_list),
1544                                            args->buffer_count);
1545         if (exec2_list == NULL) {
1546                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1547                           args->buffer_count);
1548                 return -ENOMEM;
1549         }
1550         ret = copy_from_user(exec2_list,
1551                              to_user_ptr(args->buffers_ptr),
1552                              sizeof(*exec2_list) * args->buffer_count);
1553         if (ret != 0) {
1554                 DRM_DEBUG("copy %d exec entries failed %d\n",
1555                           args->buffer_count, ret);
1556                 drm_free_large(exec2_list);
1557                 return -EFAULT;
1558         }
1559
1560         ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list);
1561         if (!ret) {
1562                 /* Copy the new buffer offsets back to the user's exec list. */
1563                 struct drm_i915_gem_exec_object2 __user *user_exec_list =
1564                                    to_user_ptr(args->buffers_ptr);
1565                 int i;
1566
1567                 for (i = 0; i < args->buffer_count; i++) {
1568                         ret = __copy_to_user(&user_exec_list[i].offset,
1569                                              &exec2_list[i].offset,
1570                                              sizeof(user_exec_list[i].offset));
1571                         if (ret) {
1572                                 ret = -EFAULT;
1573                                 DRM_DEBUG("failed to copy %d exec entries "
1574                                           "back to user\n",
1575                                           args->buffer_count);
1576                                 break;
1577                         }
1578                 }
1579         }
1580
1581         drm_free_large(exec2_list);
1582         return ret;
1583 }