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_BIAS (1<<28)
  39
  40 #define BATCH_OFFSET_BIAS (256*1024)
  41
  42 struct eb_vmas {
  43         struct list_head vmas;
  44         int and;
  45         union {
  46                 struct i915_vma *lut[0];
  47                 struct hlist_head buckets[0];
  48         };
  49 };
  50
  51 static struct eb_vmas *
  52 eb_create(struct drm_i915_gem_execbuffer2 *args)
  53 {
  54         struct eb_vmas *eb = NULL;
  55
  56         if (args->flags & I915_EXEC_HANDLE_LUT) {
  57                 unsigned size = args->buffer_count;
  58                 size *= sizeof(struct i915_vma *);
  59                 size += sizeof(struct eb_vmas);
  60                 eb = kmalloc(size, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  61         }
  62
  63         if (eb == NULL) {
  64                 unsigned size = args->buffer_count;
  65                 unsigned count = PAGE_SIZE / sizeof(struct hlist_head) / 2;
  66                 BUILD_BUG_ON_NOT_POWER_OF_2(PAGE_SIZE / sizeof(struct hlist_head));
  67                 while (count > 2*size)
  68                         count >>= 1;
  69                 eb = kzalloc(count*sizeof(struct hlist_head) +
  70                              sizeof(struct eb_vmas),
  71                              GFP_TEMPORARY);
  72                 if (eb == NULL)
  73                         return eb;
  74
  75                 eb->and = count - 1;
  76         } else
  77                 eb->and = -args->buffer_count;
  78
  79         INIT_LIST_HEAD(&eb->vmas);
  80         return eb;
  81 }
  82
  83 static void
  84 eb_reset(struct eb_vmas *eb)
  85 {
  86         if (eb->and >= 0)
  87                 memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
  88 }
  89
  90 static int
  91 eb_lookup_vmas(struct eb_vmas *eb,
  92                struct drm_i915_gem_exec_object2 *exec,
  93                const struct drm_i915_gem_execbuffer2 *args,
  94                struct i915_address_space *vm,
  95                struct drm_file *file)
  96 {
  97         struct drm_i915_private *dev_priv = vm->dev->dev_private;
  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                 drm_gem_object_reference(&obj->base);
 125                 list_add_tail(&obj->obj_exec_link, &objects);
 126         }
 127         spin_unlock(&file->table_lock);
 128
 129         i = 0;
 130         while (!list_empty(&objects)) {
 131                 struct i915_vma *vma;
 132                 struct i915_address_space *bind_vm = vm;
 133
 134                 if (exec[i].flags & EXEC_OBJECT_NEEDS_GTT &&
 135                     USES_FULL_PPGTT(vm->dev)) {
 136                         ret = -EINVAL;
 137                         goto err;
 138                 }
 139
 140                 /* If we have secure dispatch, or the userspace assures us that
 141                  * they know what they're doing, use the GGTT VM.
 142                  */
 143                 if (((args->flags & I915_EXEC_SECURE) &&
 144                     (i == (args->buffer_count - 1))))
 145                         bind_vm = &dev_priv->gtt.base;
 146
 147                 obj = list_first_entry(&objects,
 148                                        struct drm_i915_gem_object,
 149                                        obj_exec_link);
 150
 151                 /*
 152                  * NOTE: We can leak any vmas created here when something fails
 153                  * later on. But that's no issue since vma_unbind can deal with
 154                  * vmas which are not actually bound. And since only
 155                  * lookup_or_create exists as an interface to get at the vma
 156                  * from the (obj, vm) we don't run the risk of creating
 157                  * duplicated vmas for the same vm.
 158                  */
 159                 vma = i915_gem_obj_lookup_or_create_vma(obj, bind_vm);
 160                 if (IS_ERR(vma)) {
 161                         DRM_DEBUG("Failed to lookup VMA\n");
 162                         ret = PTR_ERR(vma);
 163                         goto err;
 164                 }
 165
 166                 /* Transfer ownership from the objects list to the vmas list. */
 167                 list_add_tail(&vma->exec_list, &eb->vmas);
 168                 list_del_init(&obj->obj_exec_link);
 169
 170                 vma->exec_entry = &exec[i];
 171                 if (eb->and < 0) {
 172                         eb->lut[i] = vma;
 173                 } else {
 174                         uint32_t handle = args->flags & I915_EXEC_HANDLE_LUT ? i : exec[i].handle;
 175                         vma->exec_handle = handle;
 176                         hlist_add_head(&vma->exec_node,
 177                                        &eb->buckets[handle & eb->and]);
 178                 }
 179                 ++i;
 180         }
 181
 182         return 0;
 183
 184
 185 err:
 186         while (!list_empty(&objects)) {
 187                 obj = list_first_entry(&objects,
 188                                        struct drm_i915_gem_object,
 189                                        obj_exec_link);
 190                 list_del_init(&obj->obj_exec_link);
 191                 drm_gem_object_unreference(&obj->base);
 192         }
 193         /*
 194          * Objects already transfered to the vmas list will be unreferenced by
 195          * eb_destroy.
 196          */
 197
 198         return ret;
 199 }
 200
 201 static struct i915_vma *eb_get_vma(struct eb_vmas *eb, unsigned long handle)
 202 {
 203         if (eb->and < 0) {
 204                 if (handle >= -eb->and)
 205                         return NULL;
 206                 return eb->lut[handle];
 207         } else {
 208                 struct hlist_head *head;
 209                 struct hlist_node *node;
 210
 211                 head = &eb->buckets[handle & eb->and];
 212                 hlist_for_each(node, head) {
 213                         struct i915_vma *vma;
 214
 215                         vma = hlist_entry(node, struct i915_vma, exec_node);
 216                         if (vma->exec_handle == handle)
 217                                 return vma;
 218                 }
 219                 return NULL;
 220         }
 221 }
 222
 223 static void
 224 i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
 225 {
 226         struct drm_i915_gem_exec_object2 *entry;
 227         struct drm_i915_gem_object *obj = vma->obj;
 228
 229         if (!drm_mm_node_allocated(&vma->node))
 230                 return;
 231
 232         entry = vma->exec_entry;
 233
 234         if (entry->flags & __EXEC_OBJECT_HAS_FENCE)
 235                 i915_gem_object_unpin_fence(obj);
 236
 237         if (entry->flags & __EXEC_OBJECT_HAS_PIN)
 238                 vma->pin_count--;
 239
 240         entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
 241 }
 242
 243 static void eb_destroy(struct eb_vmas *eb)
 244 {
 245         while (!list_empty(&eb->vmas)) {
 246                 struct i915_vma *vma;
 247
 248                 vma = list_first_entry(&eb->vmas,
 249                                        struct i915_vma,
 250                                        exec_list);
 251                 list_del_init(&vma->exec_list);
 252                 i915_gem_execbuffer_unreserve_vma(vma);
 253                 drm_gem_object_unreference(&vma->obj->base);
 254         }
 255         kfree(eb);
 256 }
 257
 258 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 259 {
 260         return (HAS_LLC(obj->base.dev) ||
 261                 obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
 262                 !obj->map_and_fenceable ||
 263                 obj->cache_level != I915_CACHE_NONE);
 264 }
 265
 266 static int
 267 relocate_entry_cpu(struct drm_i915_gem_object *obj,
 268                    struct drm_i915_gem_relocation_entry *reloc,
 269                    uint64_t target_offset)
 270 {
 271         struct drm_device *dev = obj->base.dev;
 272         uint32_t page_offset = offset_in_page(reloc->offset);
 273         uint64_t delta = reloc->delta + target_offset;
 274         char *vaddr;
 275         int ret;
 276
 277         ret = i915_gem_object_set_to_cpu_domain(obj, true);
 278         if (ret)
 279                 return ret;
 280
 281         vaddr = kmap_atomic(i915_gem_object_get_page(obj,
 282                                 reloc->offset >> PAGE_SHIFT));
 283         *(uint32_t *)(vaddr + page_offset) = lower_32_bits(delta);
 284
 285         if (INTEL_INFO(dev)->gen >= 8) {
 286                 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
 287
 288                 if (page_offset == 0) {
 289                         kunmap_atomic(vaddr);
 290                         vaddr = kmap_atomic(i915_gem_object_get_page(obj,
 291                             (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
 292                 }
 293
 294                 *(uint32_t *)(vaddr + page_offset) = upper_32_bits(delta);
 295         }
 296
 297         kunmap_atomic(vaddr);
 298
 299         return 0;
 300 }
 301
 302 static int
 303 relocate_entry_gtt(struct drm_i915_gem_object *obj,
 304                    struct drm_i915_gem_relocation_entry *reloc,
 305                    uint64_t target_offset)
 306 {
 307         struct drm_device *dev = obj->base.dev;
 308         struct drm_i915_private *dev_priv = dev->dev_private;
 309         uint64_t delta = reloc->delta + target_offset;
 310         uint32_t __iomem *reloc_entry;
 311         void __iomem *reloc_page;
 312         int ret;
 313
 314         ret = i915_gem_object_set_to_gtt_domain(obj, true);
 315         if (ret)
 316                 return ret;
 317
 318         ret = i915_gem_object_put_fence(obj);
 319         if (ret)
 320                 return ret;
 321
 322         /* Map the page containing the relocation we're going to perform.  */
 323         reloc->offset += i915_gem_obj_ggtt_offset(obj);
 324         reloc_page = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 325                         reloc->offset & PAGE_MASK);
 326         reloc_entry = (uint32_t __iomem *)
 327                 (reloc_page + offset_in_page(reloc->offset));
 328         iowrite32(lower_32_bits(delta), reloc_entry);
 329
 330         if (INTEL_INFO(dev)->gen >= 8) {
 331                 reloc_entry += 1;
 332
 333                 if (offset_in_page(reloc->offset + sizeof(uint32_t)) == 0) {
 334                         io_mapping_unmap_atomic(reloc_page);
 335                         reloc_page = io_mapping_map_atomic_wc(
 336                                         dev_priv->gtt.mappable,
 337                                         reloc->offset + sizeof(uint32_t));
 338                         reloc_entry = reloc_page;
 339                 }
 340
 341                 iowrite32(upper_32_bits(delta), reloc_entry);
 342         }
 343
 344         io_mapping_unmap_atomic(reloc_page);
 345
 346         return 0;
 347 }
 348
 349 static int
 350 i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
 351                                    struct eb_vmas *eb,
 352                                    struct drm_i915_gem_relocation_entry *reloc)
 353 {
 354         struct drm_device *dev = obj->base.dev;
 355         struct drm_gem_object *target_obj;
 356         struct drm_i915_gem_object *target_i915_obj;
 357         struct i915_vma *target_vma;
 358         uint64_t target_offset;
 359         int ret;
 360
 361         /* we've already hold a reference to all valid objects */
 362         target_vma = eb_get_vma(eb, reloc->target_handle);
 363         if (unlikely(target_vma == NULL))
 364                 return -ENOENT;
 365         target_i915_obj = target_vma->obj;
 366         target_obj = &target_vma->obj->base;
 367
 368         target_offset = target_vma->node.start;
 369
 370         /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
 371          * pipe_control writes because the gpu doesn't properly redirect them
 372          * through the ppgtt for non_secure batchbuffers. */
 373         if (unlikely(IS_GEN6(dev) &&
 374             reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION &&
 375             !target_i915_obj->has_global_gtt_mapping)) {
 376                 struct i915_vma *vma =
 377                         list_first_entry(&target_i915_obj->vma_list,
 378                                          typeof(*vma), vma_link);
 379                 vma->bind_vma(vma, target_i915_obj->cache_level, GLOBAL_BIND);
 380         }
 381
 382         /* Validate that the target is in a valid r/w GPU domain */
 383         if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
 384                 DRM_DEBUG("reloc with multiple write domains: "
 385                           "obj %p target %d offset %d "
 386                           "read %08x write %08x",
 387                           obj, reloc->target_handle,
 388                           (int) reloc->offset,
 389                           reloc->read_domains,
 390                           reloc->write_domain);
 391                 return -EINVAL;
 392         }
 393         if (unlikely((reloc->write_domain | reloc->read_domains)
 394                      & ~I915_GEM_GPU_DOMAINS)) {
 395                 DRM_DEBUG("reloc with read/write non-GPU domains: "
 396                           "obj %p target %d offset %d "
 397                           "read %08x write %08x",
 398                           obj, reloc->target_handle,
 399                           (int) reloc->offset,
 400                           reloc->read_domains,
 401                           reloc->write_domain);
 402                 return -EINVAL;
 403         }
 404
 405         target_obj->pending_read_domains |= reloc->read_domains;
 406         target_obj->pending_write_domain |= reloc->write_domain;
 407
 408         /* If the relocation already has the right value in it, no
 409          * more work needs to be done.
 410          */
 411         if (target_offset == reloc->presumed_offset)
 412                 return 0;
 413
 414         /* Check that the relocation address is valid... */
 415         if (unlikely(reloc->offset >
 416                 obj->base.size - (INTEL_INFO(dev)->gen >= 8 ? 8 : 4))) {
 417                 DRM_DEBUG("Relocation beyond object bounds: "
 418                           "obj %p target %d offset %d size %d.\n",
 419                           obj, reloc->target_handle,
 420                           (int) reloc->offset,
 421                           (int) obj->base.size);
 422                 return -EINVAL;
 423         }
 424         if (unlikely(reloc->offset & 3)) {
 425                 DRM_DEBUG("Relocation not 4-byte aligned: "
 426                           "obj %p target %d offset %d.\n",
 427                           obj, reloc->target_handle,
 428                           (int) reloc->offset);
 429                 return -EINVAL;
 430         }
 431
 432         /* We can't wait for rendering with pagefaults disabled */
 433         if (obj->active && in_atomic())
 434                 return -EFAULT;
 435
 436         if (use_cpu_reloc(obj))
 437                 ret = relocate_entry_cpu(obj, reloc, target_offset);
 438         else
 439                 ret = relocate_entry_gtt(obj, reloc, target_offset);
 440
 441         if (ret)
 442                 return ret;
 443
 444         /* and update the user's relocation entry */
 445         reloc->presumed_offset = target_offset;
 446
 447         return 0;
 448 }
 449
 450 static int
 451 i915_gem_execbuffer_relocate_vma(struct i915_vma *vma,
 452                                  struct eb_vmas *eb)
 453 {
 454 #define N_RELOC(x) ((x) / sizeof(struct drm_i915_gem_relocation_entry))
 455         struct drm_i915_gem_relocation_entry stack_reloc[N_RELOC(512)];
 456         struct drm_i915_gem_relocation_entry __user *user_relocs;
 457         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 458         int remain, ret;
 459
 460         user_relocs = to_user_ptr(entry->relocs_ptr);
 461
 462         remain = entry->relocation_count;
 463         while (remain) {
 464                 struct drm_i915_gem_relocation_entry *r = stack_reloc;
 465                 int count = remain;
 466                 if (count > ARRAY_SIZE(stack_reloc))
 467                         count = ARRAY_SIZE(stack_reloc);
 468                 remain -= count;
 469
 470                 if (__copy_from_user_inatomic(r, user_relocs, count*sizeof(r[0])))
 471                         return -EFAULT;
 472
 473                 do {
 474                         u64 offset = r->presumed_offset;
 475
 476                         ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, r);
 477                         if (ret)
 478                                 return ret;
 479
 480                         if (r->presumed_offset != offset &&
 481                             __copy_to_user_inatomic(&user_relocs->presumed_offset,
 482                                                     &r->presumed_offset,
 483                                                     sizeof(r->presumed_offset))) {
 484                                 return -EFAULT;
 485                         }
 486
 487                         user_relocs++;
 488                         r++;
 489                 } while (--count);
 490         }
 491
 492         return 0;
 493 #undef N_RELOC
 494 }
 495
 496 static int
 497 i915_gem_execbuffer_relocate_vma_slow(struct i915_vma *vma,
 498                                       struct eb_vmas *eb,
 499                                       struct drm_i915_gem_relocation_entry *relocs)
 500 {
 501         const struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 502         int i, ret;
 503
 504         for (i = 0; i < entry->relocation_count; i++) {
 505                 ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, &relocs[i]);
 506                 if (ret)
 507                         return ret;
 508         }
 509
 510         return 0;
 511 }
 512
 513 static int
 514 i915_gem_execbuffer_relocate(struct eb_vmas *eb)
 515 {
 516         struct i915_vma *vma;
 517         int ret = 0;
 518
 519         /* This is the fast path and we cannot handle a pagefault whilst
 520          * holding the struct mutex lest the user pass in the relocations
 521          * contained within a mmaped bo. For in such a case we, the page
 522          * fault handler would call i915_gem_fault() and we would try to
 523          * acquire the struct mutex again. Obviously this is bad and so
 524          * lockdep complains vehemently.
 525          */
 526         pagefault_disable();
 527         list_for_each_entry(vma, &eb->vmas, exec_list) {
 528                 ret = i915_gem_execbuffer_relocate_vma(vma, eb);
 529                 if (ret)
 530                         break;
 531         }
 532         pagefault_enable();
 533
 534         return ret;
 535 }
 536
 537 static int
 538 need_reloc_mappable(struct i915_vma *vma)
 539 {
 540         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 541         return entry->relocation_count && !use_cpu_reloc(vma->obj) &&
 542                 i915_is_ggtt(vma->vm);
 543 }
 544
 545 static int
 546 i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
 547                                 struct intel_engine_cs *ring,
 548                                 bool *need_reloc)
 549 {
 550         struct drm_i915_gem_object *obj = vma->obj;
 551         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 552         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 553         bool need_fence;
 554         uint64_t flags;
 555         int ret;
 556
 557         flags = 0;
 558
 559         need_fence =
 560                 has_fenced_gpu_access &&
 561                 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 562                 obj->tiling_mode != I915_TILING_NONE;
 563         if (need_fence || need_reloc_mappable(vma))
 564                 flags |= PIN_MAPPABLE;
 565
 566         if (entry->flags & EXEC_OBJECT_NEEDS_GTT)
 567                 flags |= PIN_GLOBAL;
 568         if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS)
 569                 flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
 570
 571         ret = i915_gem_object_pin(obj, vma->vm, entry->alignment, flags);
 572         if (ret)
 573                 return ret;
 574
 575         entry->flags |= __EXEC_OBJECT_HAS_PIN;
 576
 577         if (has_fenced_gpu_access) {
 578                 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
 579                         ret = i915_gem_object_get_fence(obj);
 580                         if (ret)
 581                                 return ret;
 582
 583                         if (i915_gem_object_pin_fence(obj))
 584                                 entry->flags |= __EXEC_OBJECT_HAS_FENCE;
 585
 586                         obj->pending_fenced_gpu_access = true;
 587                 }
 588         }
 589
 590         if (entry->offset != vma->node.start) {
 591                 entry->offset = vma->node.start;
 592                 *need_reloc = true;
 593         }
 594
 595         if (entry->flags & EXEC_OBJECT_WRITE) {
 596                 obj->base.pending_read_domains = I915_GEM_DOMAIN_RENDER;
 597                 obj->base.pending_write_domain = I915_GEM_DOMAIN_RENDER;
 598         }
 599
 600         return 0;
 601 }
 602
 603 static bool
 604 eb_vma_misplaced(struct i915_vma *vma, bool has_fenced_gpu_access)
 605 {
 606         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 607         struct drm_i915_gem_object *obj = vma->obj;
 608         bool need_fence, need_mappable;
 609
 610         need_fence =
 611                 has_fenced_gpu_access &&
 612                 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 613                 obj->tiling_mode != I915_TILING_NONE;
 614         need_mappable = need_fence || need_reloc_mappable(vma);
 615
 616         WARN_ON((need_mappable || need_fence) &&
 617                !i915_is_ggtt(vma->vm));
 618
 619         if (entry->alignment &&
 620             vma->node.start & (entry->alignment - 1))
 621                 return true;
 622
 623         if (need_mappable && !obj->map_and_fenceable)
 624                 return true;
 625
 626         if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS &&
 627             vma->node.start < BATCH_OFFSET_BIAS)
 628                 return true;
 629
 630         return false;
 631 }
 632
 633 static int
 634 i915_gem_execbuffer_reserve(struct intel_engine_cs *ring,
 635                             struct list_head *vmas,
 636                             bool *need_relocs)
 637 {
 638         struct drm_i915_gem_object *obj;
 639         struct i915_vma *vma;
 640         struct i915_address_space *vm;
 641         struct list_head ordered_vmas;
 642         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 643         int retry;
 644
 645         if (list_empty(vmas))
 646                 return 0;
 647
 648         i915_gem_retire_requests_ring(ring);
 649
 650         vm = list_first_entry(vmas, struct i915_vma, exec_list)->vm;
 651
 652         INIT_LIST_HEAD(&ordered_vmas);
 653         while (!list_empty(vmas)) {
 654                 struct drm_i915_gem_exec_object2 *entry;
 655                 bool need_fence, need_mappable;
 656
 657                 vma = list_first_entry(vmas, struct i915_vma, exec_list);
 658                 obj = vma->obj;
 659                 entry = vma->exec_entry;
 660
 661                 need_fence =
 662                         has_fenced_gpu_access &&
 663                         entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 664                         obj->tiling_mode != I915_TILING_NONE;
 665                 need_mappable = need_fence || need_reloc_mappable(vma);
 666
 667                 if (need_mappable)
 668                         list_move(&vma->exec_list, &ordered_vmas);
 669                 else
 670                         list_move_tail(&vma->exec_list, &ordered_vmas);
 671
 672                 obj->base.pending_read_domains = I915_GEM_GPU_DOMAINS & ~I915_GEM_DOMAIN_COMMAND;
 673                 obj->base.pending_write_domain = 0;
 674                 obj->pending_fenced_gpu_access = false;
 675         }
 676         list_splice(&ordered_vmas, vmas);
 677
 678         /* Attempt to pin all of the buffers into the GTT.
 679          * This is done in 3 phases:
 680          *
 681          * 1a. Unbind all objects that do not match the GTT constraints for
 682          *     the execbuffer (fenceable, mappable, alignment etc).
 683          * 1b. Increment pin count for already bound objects.
 684          * 2.  Bind new objects.
 685          * 3.  Decrement pin count.
 686          *
 687          * This avoid unnecessary unbinding of later objects in order to make
 688          * room for the earlier objects *unless* we need to defragment.
 689          */
 690         retry = 0;
 691         do {
 692                 int ret = 0;
 693
 694                 /* Unbind any ill-fitting objects or pin. */
 695                 list_for_each_entry(vma, vmas, exec_list) {
 696                         if (!drm_mm_node_allocated(&vma->node))
 697                                 continue;
 698
 699                         if (eb_vma_misplaced(vma, has_fenced_gpu_access))
 700                                 ret = i915_vma_unbind(vma);
 701                         else
 702                                 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 703                         if (ret)
 704                                 goto err;
 705                 }
 706
 707                 /* Bind fresh objects */
 708                 list_for_each_entry(vma, vmas, exec_list) {
 709                         if (drm_mm_node_allocated(&vma->node))
 710                                 continue;
 711
 712                         ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 713                         if (ret)
 714                                 goto err;
 715                 }
 716
 717 err:
 718                 if (ret != -ENOSPC || retry++)
 719                         return ret;
 720
 721                 /* Decrement pin count for bound objects */
 722                 list_for_each_entry(vma, vmas, exec_list)
 723                         i915_gem_execbuffer_unreserve_vma(vma);
 724
 725                 ret = i915_gem_evict_vm(vm, true);
 726                 if (ret)
 727                         return ret;
 728         } while (1);
 729 }
 730
 731 static int
 732 i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
 733                                   struct drm_i915_gem_execbuffer2 *args,
 734                                   struct drm_file *file,
 735                                   struct intel_engine_cs *ring,
 736                                   struct eb_vmas *eb,
 737                                   struct drm_i915_gem_exec_object2 *exec)
 738 {
 739         struct drm_i915_gem_relocation_entry *reloc;
 740         struct i915_address_space *vm;
 741         struct i915_vma *vma;
 742         bool need_relocs;
 743         int *reloc_offset;
 744         int i, total, ret;
 745         unsigned count = args->buffer_count;
 746
 747         if (WARN_ON(list_empty(&eb->vmas)))
 748                 return 0;
 749
 750         vm = list_first_entry(&eb->vmas, struct i915_vma, exec_list)->vm;
 751
 752         /* We may process another execbuffer during the unlock... */
 753         while (!list_empty(&eb->vmas)) {
 754                 vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
 755                 list_del_init(&vma->exec_list);
 756                 i915_gem_execbuffer_unreserve_vma(vma);
 757                 drm_gem_object_unreference(&vma->obj->base);
 758         }
 759
 760         mutex_unlock(&dev->struct_mutex);
 761
 762         total = 0;
 763         for (i = 0; i < count; i++)
 764                 total += exec[i].relocation_count;
 765
 766         reloc_offset = drm_malloc_ab(count, sizeof(*reloc_offset));
 767         reloc = drm_malloc_ab(total, sizeof(*reloc));
 768         if (reloc == NULL || reloc_offset == NULL) {
 769                 drm_free_large(reloc);
 770                 drm_free_large(reloc_offset);
 771                 mutex_lock(&dev->struct_mutex);
 772                 return -ENOMEM;
 773         }
 774
 775         total = 0;
 776         for (i = 0; i < count; i++) {
 777                 struct drm_i915_gem_relocation_entry __user *user_relocs;
 778                 u64 invalid_offset = (u64)-1;
 779                 int j;
 780
 781                 user_relocs = to_user_ptr(exec[i].relocs_ptr);
 782
 783                 if (copy_from_user(reloc+total, user_relocs,
 784                                    exec[i].relocation_count * sizeof(*reloc))) {
 785                         ret = -EFAULT;
 786                         mutex_lock(&dev->struct_mutex);
 787                         goto err;
 788                 }
 789
 790                 /* As we do not update the known relocation offsets after
 791                  * relocating (due to the complexities in lock handling),
 792                  * we need to mark them as invalid now so that we force the
 793                  * relocation processing next time. Just in case the target
 794                  * object is evicted and then rebound into its old
 795                  * presumed_offset before the next execbuffer - if that
 796                  * happened we would make the mistake of assuming that the
 797                  * relocations were valid.
 798                  */
 799                 for (j = 0; j < exec[i].relocation_count; j++) {
 800                         if (__copy_to_user(&user_relocs[j].presumed_offset,
 801                                            &invalid_offset,
 802                                            sizeof(invalid_offset))) {
 803                                 ret = -EFAULT;
 804                                 mutex_lock(&dev->struct_mutex);
 805                                 goto err;
 806                         }
 807                 }
 808
 809                 reloc_offset[i] = total;
 810                 total += exec[i].relocation_count;
 811         }
 812
 813         ret = i915_mutex_lock_interruptible(dev);
 814         if (ret) {
 815                 mutex_lock(&dev->struct_mutex);
 816                 goto err;
 817         }
 818
 819         /* reacquire the objects */
 820         eb_reset(eb);
 821         ret = eb_lookup_vmas(eb, exec, args, vm, file);
 822         if (ret)
 823                 goto err;
 824
 825         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
 826         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
 827         if (ret)
 828                 goto err;
 829
 830         list_for_each_entry(vma, &eb->vmas, exec_list) {
 831                 int offset = vma->exec_entry - exec;
 832                 ret = i915_gem_execbuffer_relocate_vma_slow(vma, eb,
 833                                                             reloc + reloc_offset[offset]);
 834                 if (ret)
 835                         goto err;
 836         }
 837
 838         /* Leave the user relocations as are, this is the painfully slow path,
 839          * and we want to avoid the complication of dropping the lock whilst
 840          * having buffers reserved in the aperture and so causing spurious
 841          * ENOSPC for random operations.
 842          */
 843
 844 err:
 845         drm_free_large(reloc);
 846         drm_free_large(reloc_offset);
 847         return ret;
 848 }
 849
 850 static int
 851 i915_gem_execbuffer_move_to_gpu(struct intel_engine_cs *ring,
 852                                 struct list_head *vmas)
 853 {
 854         struct i915_vma *vma;
 855         uint32_t flush_domains = 0;
 856         bool flush_chipset = false;
 857         int ret;
 858
 859         list_for_each_entry(vma, vmas, exec_list) {
 860                 struct drm_i915_gem_object *obj = vma->obj;
 861                 ret = i915_gem_object_sync(obj, ring);
 862                 if (ret)
 863                         return ret;
 864
 865                 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
 866                         flush_chipset |= i915_gem_clflush_object(obj, false);
 867
 868                 flush_domains |= obj->base.write_domain;
 869         }
 870
 871         if (flush_chipset)
 872                 i915_gem_chipset_flush(ring->dev);
 873
 874         if (flush_domains & I915_GEM_DOMAIN_GTT)
 875                 wmb();
 876
 877         /* Unconditionally invalidate gpu caches and ensure that we do flush
 878          * any residual writes from the previous batch.
 879          */
 880         return intel_ring_invalidate_all_caches(ring);
 881 }
 882
 883 static bool
 884 i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
 885 {
 886         if (exec->flags & __I915_EXEC_UNKNOWN_FLAGS)
 887                 return false;
 888
 889         return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
 890 }
 891
 892 static int
 893 validate_exec_list(struct drm_i915_gem_exec_object2 *exec,
 894                    int count)
 895 {
 896         int i;
 897         unsigned relocs_total = 0;
 898         unsigned relocs_max = UINT_MAX / sizeof(struct drm_i915_gem_relocation_entry);
 899
 900         for (i = 0; i < count; i++) {
 901                 char __user *ptr = to_user_ptr(exec[i].relocs_ptr);
 902                 int length; /* limited by fault_in_pages_readable() */
 903
 904                 if (exec[i].flags & __EXEC_OBJECT_UNKNOWN_FLAGS)
 905                         return -EINVAL;
 906
 907                 /* First check for malicious input causing overflow in
 908                  * the worst case where we need to allocate the entire
 909                  * relocation tree as a single array.
 910                  */
 911                 if (exec[i].relocation_count > relocs_max - relocs_total)
 912                         return -EINVAL;
 913                 relocs_total += exec[i].relocation_count;
 914
 915                 length = exec[i].relocation_count *
 916                         sizeof(struct drm_i915_gem_relocation_entry);
 917                 /*
 918                  * We must check that the entire relocation array is safe
 919                  * to read, but since we may need to update the presumed
 920                  * offsets during execution, check for full write access.
 921                  */
 922                 if (!access_ok(VERIFY_WRITE, ptr, length))
 923                         return -EFAULT;
 924
 925                 if (likely(!i915.prefault_disable)) {
 926                         if (fault_in_multipages_readable(ptr, length))
 927                                 return -EFAULT;
 928                 }
 929         }
 930
 931         return 0;
 932 }
 933
 934 static struct intel_context *
 935 i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
 936                           struct intel_engine_cs *ring, const u32 ctx_id)
 937 {
 938         struct intel_context *ctx = NULL;
 939         struct i915_ctx_hang_stats *hs;
 940
 941         if (ring->id != RCS && ctx_id != DEFAULT_CONTEXT_HANDLE)
 942                 return ERR_PTR(-EINVAL);
 943
 944         ctx = i915_gem_context_get(file->driver_priv, ctx_id);
 945         if (IS_ERR(ctx))
 946                 return ctx;
 947
 948         hs = &ctx->hang_stats;
 949         if (hs->banned) {
 950                 DRM_DEBUG("Context %u tried to submit while banned\n", ctx_id);
 951                 return ERR_PTR(-EIO);
 952         }
 953
 954         return ctx;
 955 }
 956
 957 static void
 958 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 959                                    struct intel_engine_cs *ring)
 960 {
 961         struct i915_vma *vma;
 962
 963         list_for_each_entry(vma, vmas, exec_list) {
 964                 struct drm_i915_gem_object *obj = vma->obj;
 965                 u32 old_read = obj->base.read_domains;
 966                 u32 old_write = obj->base.write_domain;
 967
 968                 obj->base.write_domain = obj->base.pending_write_domain;
 969                 if (obj->base.write_domain == 0)
 970                         obj->base.pending_read_domains |= obj->base.read_domains;
 971                 obj->base.read_domains = obj->base.pending_read_domains;
 972                 obj->fenced_gpu_access = obj->pending_fenced_gpu_access;
 973
 974                 i915_vma_move_to_active(vma, ring);
 975                 if (obj->base.write_domain) {
 976                         obj->dirty = 1;
 977                         obj->last_write_seqno = intel_ring_get_seqno(ring);
 978
 979                         intel_fb_obj_invalidate(obj, ring);
 980
 981                         /* update for the implicit flush after a batch */
 982                         obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
 983                 }
 984
 985                 trace_i915_gem_object_change_domain(obj, old_read, old_write);
 986         }
 987 }
 988
 989 static void
 990 i915_gem_execbuffer_retire_commands(struct drm_device *dev,
 991                                     struct drm_file *file,
 992                                     struct intel_engine_cs *ring,
 993                                     struct drm_i915_gem_object *obj)
 994 {
 995         /* Unconditionally force add_request to emit a full flush. */
 996         ring->gpu_caches_dirty = true;
 997
 998         /* Add a breadcrumb for the completion of the batch buffer */
 999         (void)__i915_add_request(ring, file, obj, NULL);
1000 }
1001
1002 static int
1003 i915_reset_gen7_sol_offsets(struct drm_device *dev,
1004                             struct intel_engine_cs *ring)
1005 {
1006         struct drm_i915_private *dev_priv = dev->dev_private;
1007         int ret, i;
1008
1009         if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS]) {
1010                 DRM_DEBUG("sol reset is gen7/rcs only\n");
1011                 return -EINVAL;
1012         }
1013
1014         ret = intel_ring_begin(ring, 4 * 3);
1015         if (ret)
1016                 return ret;
1017
1018         for (i = 0; i < 4; i++) {
1019                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1020                 intel_ring_emit(ring, GEN7_SO_WRITE_OFFSET(i));
1021                 intel_ring_emit(ring, 0);
1022         }
1023
1024         intel_ring_advance(ring);
1025
1026         return 0;
1027 }
1028
1029 static int
1030 legacy_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
1031                              struct intel_engine_cs *ring,
1032                              struct intel_context *ctx,
1033                              struct drm_i915_gem_execbuffer2 *args,
1034                              struct list_head *vmas,
1035                              struct drm_i915_gem_object *batch_obj,
1036                              u64 exec_start, u32 flags)
1037 {
1038         struct drm_clip_rect *cliprects = NULL;
1039         struct drm_i915_private *dev_priv = dev->dev_private;
1040         u64 exec_len;
1041         int instp_mode;
1042         u32 instp_mask;
1043         int i, ret = 0;
1044
1045         if (args->num_cliprects != 0) {
1046                 if (ring != &dev_priv->ring[RCS]) {
1047                         DRM_DEBUG("clip rectangles are only valid with the render ring\n");
1048                         return -EINVAL;
1049                 }
1050
1051                 if (INTEL_INFO(dev)->gen >= 5) {
1052                         DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
1053                         return -EINVAL;
1054                 }
1055
1056                 if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) {
1057                         DRM_DEBUG("execbuf with %u cliprects\n",
1058                                   args->num_cliprects);
1059                         return -EINVAL;
1060                 }
1061
1062                 cliprects = kcalloc(args->num_cliprects,
1063                                     sizeof(*cliprects),
1064                                     GFP_KERNEL);
1065                 if (cliprects == NULL) {
1066                         ret = -ENOMEM;
1067                         goto error;
1068                 }
1069
1070                 if (copy_from_user(cliprects,
1071                                    to_user_ptr(args->cliprects_ptr),
1072                                    sizeof(*cliprects)*args->num_cliprects)) {
1073                         ret = -EFAULT;
1074                         goto error;
1075                 }
1076         } else {
1077                 if (args->DR4 == 0xffffffff) {
1078                         DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
1079                         args->DR4 = 0;
1080                 }
1081
1082                 if (args->DR1 || args->DR4 || args->cliprects_ptr) {
1083                         DRM_DEBUG("0 cliprects but dirt in cliprects fields\n");
1084                         return -EINVAL;
1085                 }
1086         }
1087
1088         ret = i915_gem_execbuffer_move_to_gpu(ring, vmas);
1089         if (ret)
1090                 goto error;
1091
1092         ret = i915_switch_context(ring, ctx);
1093         if (ret)
1094                 goto error;
1095
1096         instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
1097         instp_mask = I915_EXEC_CONSTANTS_MASK;
1098         switch (instp_mode) {
1099         case I915_EXEC_CONSTANTS_REL_GENERAL:
1100         case I915_EXEC_CONSTANTS_ABSOLUTE:
1101         case I915_EXEC_CONSTANTS_REL_SURFACE:
1102                 if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
1103                         DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
1104                         ret = -EINVAL;
1105                         goto error;
1106                 }
1107
1108                 if (instp_mode != dev_priv->relative_constants_mode) {
1109                         if (INTEL_INFO(dev)->gen < 4) {
1110                                 DRM_DEBUG("no rel constants on pre-gen4\n");
1111                                 ret = -EINVAL;
1112                                 goto error;
1113                         }
1114
1115                         if (INTEL_INFO(dev)->gen > 5 &&
1116                             instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
1117                                 DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
1118                                 ret = -EINVAL;
1119                                 goto error;
1120                         }
1121
1122                         /* The HW changed the meaning on this bit on gen6 */
1123                         if (INTEL_INFO(dev)->gen >= 6)
1124                                 instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
1125                 }
1126                 break;
1127         default:
1128                 DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
1129                 ret = -EINVAL;
1130                 goto error;
1131         }
1132
1133         if (ring == &dev_priv->ring[RCS] &&
1134                         instp_mode != dev_priv->relative_constants_mode) {
1135                 ret = intel_ring_begin(ring, 4);
1136                 if (ret)
1137                         goto error;
1138
1139                 intel_ring_emit(ring, MI_NOOP);
1140                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1141                 intel_ring_emit(ring, INSTPM);
1142                 intel_ring_emit(ring, instp_mask << 16 | instp_mode);
1143                 intel_ring_advance(ring);
1144
1145                 dev_priv->relative_constants_mode = instp_mode;
1146         }
1147
1148         if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
1149                 ret = i915_reset_gen7_sol_offsets(dev, ring);
1150                 if (ret)
1151                         goto error;
1152         }
1153
1154         exec_len = args->batch_len;
1155         if (cliprects) {
1156                 for (i = 0; i < args->num_cliprects; i++) {
1157                         ret = i915_emit_box(dev, &cliprects[i],
1158                                             args->DR1, args->DR4);
1159                         if (ret)
1160                                 goto error;
1161
1162                         ret = ring->dispatch_execbuffer(ring,
1163                                                         exec_start, exec_len,
1164                                                         flags);
1165                         if (ret)
1166                                 goto error;
1167                 }
1168         } else {
1169                 ret = ring->dispatch_execbuffer(ring,
1170                                                 exec_start, exec_len,
1171                                                 flags);
1172                 if (ret)
1173                         return ret;
1174         }
1175
1176         trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags);
1177
1178         i915_gem_execbuffer_move_to_active(vmas, ring);
1179         i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
1180
1181 error:
1182         kfree(cliprects);
1183         return ret;
1184 }
1185
1186 /**
1187  * Find one BSD ring to dispatch the corresponding BSD command.
1188  * The Ring ID is returned.
1189  */
1190 static int gen8_dispatch_bsd_ring(struct drm_device *dev,
1191                                   struct drm_file *file)
1192 {
1193         struct drm_i915_private *dev_priv = dev->dev_private;
1194         struct drm_i915_file_private *file_priv = file->driver_priv;
1195
1196         /* Check whether the file_priv is using one ring */
1197         if (file_priv->bsd_ring)
1198                 return file_priv->bsd_ring->id;
1199         else {
1200                 /* If no, use the ping-pong mechanism to select one ring */
1201                 int ring_id;
1202
1203                 mutex_lock(&dev->struct_mutex);
1204                 if (dev_priv->mm.bsd_ring_dispatch_index == 0) {
1205                         ring_id = VCS;
1206                         dev_priv->mm.bsd_ring_dispatch_index = 1;
1207                 } else {
1208                         ring_id = VCS2;
1209                         dev_priv->mm.bsd_ring_dispatch_index = 0;
1210                 }
1211                 file_priv->bsd_ring = &dev_priv->ring[ring_id];
1212                 mutex_unlock(&dev->struct_mutex);
1213                 return ring_id;
1214         }
1215 }
1216
1217 static struct drm_i915_gem_object *
1218 eb_get_batch(struct eb_vmas *eb)
1219 {
1220         struct i915_vma *vma = list_entry(eb->vmas.prev, typeof(*vma), exec_list);
1221
1222         /*
1223          * SNA is doing fancy tricks with compressing batch buffers, which leads
1224          * to negative relocation deltas. Usually that works out ok since the
1225          * relocate address is still positive, except when the batch is placed
1226          * very low in the GTT. Ensure this doesn't happen.
1227          *
1228          * Note that actual hangs have only been observed on gen7, but for
1229          * paranoia do it everywhere.
1230          */
1231         vma->exec_entry->flags |= __EXEC_OBJECT_NEEDS_BIAS;
1232
1233         return vma->obj;
1234 }
1235
1236 static int
1237 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
1238                        struct drm_file *file,
1239                        struct drm_i915_gem_execbuffer2 *args,
1240                        struct drm_i915_gem_exec_object2 *exec)
1241 {
1242         struct drm_i915_private *dev_priv = dev->dev_private;
1243         struct eb_vmas *eb;
1244         struct drm_i915_gem_object *batch_obj;
1245         struct intel_engine_cs *ring;
1246         struct intel_context *ctx;
1247         struct i915_address_space *vm;
1248         const u32 ctx_id = i915_execbuffer2_get_context_id(*args);
1249         u64 exec_start = args->batch_start_offset;
1250         u32 flags;
1251         int ret;
1252         bool need_relocs;
1253
1254         if (!i915_gem_check_execbuffer(args))
1255                 return -EINVAL;
1256
1257         ret = validate_exec_list(exec, args->buffer_count);
1258         if (ret)
1259                 return ret;
1260
1261         flags = 0;
1262         if (args->flags & I915_EXEC_SECURE) {
1263                 if (!file->is_master || !capable(CAP_SYS_ADMIN))
1264                     return -EPERM;
1265
1266                 flags |= I915_DISPATCH_SECURE;
1267         }
1268         if (args->flags & I915_EXEC_IS_PINNED)
1269                 flags |= I915_DISPATCH_PINNED;
1270
1271         if ((args->flags & I915_EXEC_RING_MASK) > LAST_USER_RING) {
1272                 DRM_DEBUG("execbuf with unknown ring: %d\n",
1273                           (int)(args->flags & I915_EXEC_RING_MASK));
1274                 return -EINVAL;
1275         }
1276
1277         if ((args->flags & I915_EXEC_RING_MASK) == I915_EXEC_DEFAULT)
1278                 ring = &dev_priv->ring[RCS];
1279         else if ((args->flags & I915_EXEC_RING_MASK) == I915_EXEC_BSD) {
1280                 if (HAS_BSD2(dev)) {
1281                         int ring_id;
1282                         ring_id = gen8_dispatch_bsd_ring(dev, file);
1283                         ring = &dev_priv->ring[ring_id];
1284                 } else
1285                         ring = &dev_priv->ring[VCS];
1286         } else
1287                 ring = &dev_priv->ring[(args->flags & I915_EXEC_RING_MASK) - 1];
1288
1289         if (!intel_ring_initialized(ring)) {
1290                 DRM_DEBUG("execbuf with invalid ring: %d\n",
1291                           (int)(args->flags & I915_EXEC_RING_MASK));
1292                 return -EINVAL;
1293         }
1294
1295         if (args->buffer_count < 1) {
1296                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1297                 return -EINVAL;
1298         }
1299
1300         intel_runtime_pm_get(dev_priv);
1301
1302         ret = i915_mutex_lock_interruptible(dev);
1303         if (ret)
1304                 goto pre_mutex_err;
1305
1306         if (dev_priv->ums.mm_suspended) {
1307                 mutex_unlock(&dev->struct_mutex);
1308                 ret = -EBUSY;
1309                 goto pre_mutex_err;
1310         }
1311
1312         ctx = i915_gem_validate_context(dev, file, ring, ctx_id);
1313         if (IS_ERR(ctx)) {
1314                 mutex_unlock(&dev->struct_mutex);
1315                 ret = PTR_ERR(ctx);
1316                 goto pre_mutex_err;
1317         }
1318
1319         i915_gem_context_reference(ctx);
1320
1321         vm = ctx->vm;
1322         if (!USES_FULL_PPGTT(dev))
1323                 vm = &dev_priv->gtt.base;
1324
1325         eb = eb_create(args);
1326         if (eb == NULL) {
1327                 i915_gem_context_unreference(ctx);
1328                 mutex_unlock(&dev->struct_mutex);
1329                 ret = -ENOMEM;
1330                 goto pre_mutex_err;
1331         }
1332
1333         /* Look up object handles */
1334         ret = eb_lookup_vmas(eb, exec, args, vm, file);
1335         if (ret)
1336                 goto err;
1337
1338         /* take note of the batch buffer before we might reorder the lists */
1339         batch_obj = eb_get_batch(eb);
1340
1341         /* Move the objects en-masse into the GTT, evicting if necessary. */
1342         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
1343         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
1344         if (ret)
1345                 goto err;
1346
1347         /* The objects are in their final locations, apply the relocations. */
1348         if (need_relocs)
1349                 ret = i915_gem_execbuffer_relocate(eb);
1350         if (ret) {
1351                 if (ret == -EFAULT) {
1352                         ret = i915_gem_execbuffer_relocate_slow(dev, args, file, ring,
1353                                                                 eb, exec);
1354                         BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1355                 }
1356                 if (ret)
1357                         goto err;
1358         }
1359
1360         /* Set the pending read domains for the batch buffer to COMMAND */
1361         if (batch_obj->base.pending_write_domain) {
1362                 DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
1363                 ret = -EINVAL;
1364                 goto err;
1365         }
1366         batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
1367
1368         if (i915_needs_cmd_parser(ring)) {
1369                 ret = i915_parse_cmds(ring,
1370                                       batch_obj,
1371                                       args->batch_start_offset,
1372                                       file->is_master);
1373                 if (ret)
1374                         goto err;
1375
1376                 /*
1377                  * XXX: Actually do this when enabling batch copy...
1378                  *
1379                  * Set the DISPATCH_SECURE bit to remove the NON_SECURE bit
1380                  * from MI_BATCH_BUFFER_START commands issued in the
1381                  * dispatch_execbuffer implementations. We specifically don't
1382                  * want that set when the command parser is enabled.
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             !batch_obj->has_global_gtt_mapping) {
1391                 /* When we have multiple VMs, we'll need to make sure that we
1392                  * allocate space first */
1393                 struct i915_vma *vma = i915_gem_obj_to_ggtt(batch_obj);
1394                 BUG_ON(!vma);
1395                 vma->bind_vma(vma, batch_obj->cache_level, GLOBAL_BIND);
1396         }
1397
1398         if (flags & I915_DISPATCH_SECURE)
1399                 exec_start += i915_gem_obj_ggtt_offset(batch_obj);
1400         else
1401                 exec_start += i915_gem_obj_offset(batch_obj, vm);
1402
1403         ret = legacy_ringbuffer_submission(dev, file, ring, ctx,
1404                         args, &eb->vmas, batch_obj, exec_start, flags);
1405         if (ret)
1406                 goto err;
1407
1408 err:
1409         /* the request owns the ref now */
1410         i915_gem_context_unreference(ctx);
1411         eb_destroy(eb);
1412
1413         mutex_unlock(&dev->struct_mutex);
1414
1415 pre_mutex_err:
1416         /* intel_gpu_busy should also get a ref, so it will free when the device
1417          * is really idle. */
1418         intel_runtime_pm_put(dev_priv);
1419         return ret;
1420 }
1421
1422 /*
1423  * Legacy execbuffer just creates an exec2 list from the original exec object
1424  * list array and passes it to the real function.
1425  */
1426 int
1427 i915_gem_execbuffer(struct drm_device *dev, void *data,
1428                     struct drm_file *file)
1429 {
1430         struct drm_i915_gem_execbuffer *args = data;
1431         struct drm_i915_gem_execbuffer2 exec2;
1432         struct drm_i915_gem_exec_object *exec_list = NULL;
1433         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1434         int ret, i;
1435
1436         if (args->buffer_count < 1) {
1437                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1438                 return -EINVAL;
1439         }
1440
1441         /* Copy in the exec list from userland */
1442         exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
1443         exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
1444         if (exec_list == NULL || exec2_list == NULL) {
1445                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1446                           args->buffer_count);
1447                 drm_free_large(exec_list);
1448                 drm_free_large(exec2_list);
1449                 return -ENOMEM;
1450         }
1451         ret = copy_from_user(exec_list,
1452                              to_user_ptr(args->buffers_ptr),
1453                              sizeof(*exec_list) * args->buffer_count);
1454         if (ret != 0) {
1455                 DRM_DEBUG("copy %d exec entries failed %d\n",
1456                           args->buffer_count, ret);
1457                 drm_free_large(exec_list);
1458                 drm_free_large(exec2_list);
1459                 return -EFAULT;
1460         }
1461
1462         for (i = 0; i < args->buffer_count; i++) {
1463                 exec2_list[i].handle = exec_list[i].handle;
1464                 exec2_list[i].relocation_count = exec_list[i].relocation_count;
1465                 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
1466                 exec2_list[i].alignment = exec_list[i].alignment;
1467                 exec2_list[i].offset = exec_list[i].offset;
1468                 if (INTEL_INFO(dev)->gen < 4)
1469                         exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
1470                 else
1471                         exec2_list[i].flags = 0;
1472         }
1473
1474         exec2.buffers_ptr = args->buffers_ptr;
1475         exec2.buffer_count = args->buffer_count;
1476         exec2.batch_start_offset = args->batch_start_offset;
1477         exec2.batch_len = args->batch_len;
1478         exec2.DR1 = args->DR1;
1479         exec2.DR4 = args->DR4;
1480         exec2.num_cliprects = args->num_cliprects;
1481         exec2.cliprects_ptr = args->cliprects_ptr;
1482         exec2.flags = I915_EXEC_RENDER;
1483         i915_execbuffer2_set_context_id(exec2, 0);
1484
1485         ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
1486         if (!ret) {
1487                 struct drm_i915_gem_exec_object __user *user_exec_list =
1488                         to_user_ptr(args->buffers_ptr);
1489
1490                 /* Copy the new buffer offsets back to the user's exec list. */
1491                 for (i = 0; i < args->buffer_count; i++) {
1492                         ret = __copy_to_user(&user_exec_list[i].offset,
1493                                              &exec2_list[i].offset,
1494                                              sizeof(user_exec_list[i].offset));
1495                         if (ret) {
1496                                 ret = -EFAULT;
1497                                 DRM_DEBUG("failed to copy %d exec entries "
1498                                           "back to user (%d)\n",
1499                                           args->buffer_count, ret);
1500                                 break;
1501                         }
1502                 }
1503         }
1504
1505         drm_free_large(exec_list);
1506         drm_free_large(exec2_list);
1507         return ret;
1508 }
1509
1510 int
1511 i915_gem_execbuffer2(struct drm_device *dev, void *data,
1512                      struct drm_file *file)
1513 {
1514         struct drm_i915_gem_execbuffer2 *args = data;
1515         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1516         int ret;
1517
1518         if (args->buffer_count < 1 ||
1519             args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
1520                 DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
1521                 return -EINVAL;
1522         }
1523
1524         if (args->rsvd2 != 0) {
1525                 DRM_DEBUG("dirty rvsd2 field\n");
1526                 return -EINVAL;
1527         }
1528
1529         exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count,
1530                              GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
1531         if (exec2_list == NULL)
1532                 exec2_list = drm_malloc_ab(sizeof(*exec2_list),
1533                                            args->buffer_count);
1534         if (exec2_list == NULL) {
1535                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1536                           args->buffer_count);
1537                 return -ENOMEM;
1538         }
1539         ret = copy_from_user(exec2_list,
1540                              to_user_ptr(args->buffers_ptr),
1541                              sizeof(*exec2_list) * args->buffer_count);
1542         if (ret != 0) {
1543                 DRM_DEBUG("copy %d exec entries failed %d\n",
1544                           args->buffer_count, ret);
1545                 drm_free_large(exec2_list);
1546                 return -EFAULT;
1547         }
1548
1549         ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list);
1550         if (!ret) {
1551                 /* Copy the new buffer offsets back to the user's exec list. */
1552                 struct drm_i915_gem_exec_object2 __user *user_exec_list =
1553                                    to_user_ptr(args->buffers_ptr);
1554                 int i;
1555
1556                 for (i = 0; i < args->buffer_count; i++) {
1557                         ret = __copy_to_user(&user_exec_list[i].offset,
1558                                              &exec2_list[i].offset,
1559                                              sizeof(user_exec_list[i].offset));
1560                         if (ret) {
1561                                 ret = -EFAULT;
1562                                 DRM_DEBUG("failed to copy %d exec entries "
1563                                           "back to user\n",
1564                                           args->buffer_count);
1565                                 break;
1566                         }
1567                 }
1568         }
1569
1570         drm_free_large(exec2_list);
1571         return ret;
1572 }