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 #include <linux/uaccess.h>
  36
  37 #define  __EXEC_OBJECT_HAS_PIN (1<<31)
  38 #define  __EXEC_OBJECT_HAS_FENCE (1<<30)
  39 #define  __EXEC_OBJECT_NEEDS_MAP (1<<29)
  40 #define  __EXEC_OBJECT_NEEDS_BIAS (1<<28)
  41
  42 #define BATCH_OFFSET_BIAS (256*1024)
  43
  44 struct eb_vmas {
  45         struct list_head vmas;
  46         int and;
  47         union {
  48                 struct i915_vma *lut[0];
  49                 struct hlist_head buckets[0];
  50         };
  51 };
  52
  53 static struct eb_vmas *
  54 eb_create(struct drm_i915_gem_execbuffer2 *args)
  55 {
  56         struct eb_vmas *eb = NULL;
  57
  58         if (args->flags & I915_EXEC_HANDLE_LUT) {
  59                 unsigned size = args->buffer_count;
  60                 size *= sizeof(struct i915_vma *);
  61                 size += sizeof(struct eb_vmas);
  62                 eb = kmalloc(size, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  63         }
  64
  65         if (eb == NULL) {
  66                 unsigned size = args->buffer_count;
  67                 unsigned count = PAGE_SIZE / sizeof(struct hlist_head) / 2;
  68                 BUILD_BUG_ON_NOT_POWER_OF_2(PAGE_SIZE / sizeof(struct hlist_head));
  69                 while (count > 2*size)
  70                         count >>= 1;
  71                 eb = kzalloc(count*sizeof(struct hlist_head) +
  72                              sizeof(struct eb_vmas),
  73                              GFP_TEMPORARY);
  74                 if (eb == NULL)
  75                         return eb;
  76
  77                 eb->and = count - 1;
  78         } else
  79                 eb->and = -args->buffer_count;
  80
  81         INIT_LIST_HEAD(&eb->vmas);
  82         return eb;
  83 }
  84
  85 static void
  86 eb_reset(struct eb_vmas *eb)
  87 {
  88         if (eb->and >= 0)
  89                 memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
  90 }
  91
  92 static int
  93 eb_lookup_vmas(struct eb_vmas *eb,
  94                struct drm_i915_gem_exec_object2 *exec,
  95                const struct drm_i915_gem_execbuffer2 *args,
  96                struct i915_address_space *vm,
  97                struct drm_file *file)
  98 {
  99         struct drm_i915_gem_object *obj;
 100         struct list_head objects;
 101         int i, ret;
 102
 103         INIT_LIST_HEAD(&objects);
 104         spin_lock(&file->table_lock);
 105         /* Grab a reference to the object and release the lock so we can lookup
 106          * or create the VMA without using GFP_ATOMIC */
 107         for (i = 0; i < args->buffer_count; i++) {
 108                 obj = to_intel_bo(idr_find(&file->object_idr, exec[i].handle));
 109                 if (obj == NULL) {
 110                         spin_unlock(&file->table_lock);
 111                         DRM_DEBUG("Invalid object handle %d at index %d\n",
 112                                    exec[i].handle, i);
 113                         ret = -ENOENT;
 114                         goto err;
 115                 }
 116
 117                 if (!list_empty(&obj->obj_exec_link)) {
 118                         spin_unlock(&file->table_lock);
 119                         DRM_DEBUG("Object %p [handle %d, index %d] appears more than once in object list\n",
 120                                    obj, exec[i].handle, i);
 121                         ret = -EINVAL;
 122                         goto err;
 123                 }
 124
 125                 drm_gem_object_reference(&obj->base);
 126                 list_add_tail(&obj->obj_exec_link, &objects);
 127         }
 128         spin_unlock(&file->table_lock);
 129
 130         i = 0;
 131         while (!list_empty(&objects)) {
 132                 struct i915_vma *vma;
 133
 134                 obj = list_first_entry(&objects,
 135                                        struct drm_i915_gem_object,
 136                                        obj_exec_link);
 137
 138                 /*
 139                  * NOTE: We can leak any vmas created here when something fails
 140                  * later on. But that's no issue since vma_unbind can deal with
 141                  * vmas which are not actually bound. And since only
 142                  * lookup_or_create exists as an interface to get at the vma
 143                  * from the (obj, vm) we don't run the risk of creating
 144                  * duplicated vmas for the same vm.
 145                  */
 146                 vma = i915_gem_obj_lookup_or_create_vma(obj, vm);
 147                 if (IS_ERR(vma)) {
 148                         DRM_DEBUG("Failed to lookup VMA\n");
 149                         ret = PTR_ERR(vma);
 150                         goto err;
 151                 }
 152
 153                 /* Transfer ownership from the objects list to the vmas list. */
 154                 list_add_tail(&vma->exec_list, &eb->vmas);
 155                 list_del_init(&obj->obj_exec_link);
 156
 157                 vma->exec_entry = &exec[i];
 158                 if (eb->and < 0) {
 159                         eb->lut[i] = vma;
 160                 } else {
 161                         uint32_t handle = args->flags & I915_EXEC_HANDLE_LUT ? i : exec[i].handle;
 162                         vma->exec_handle = handle;
 163                         hlist_add_head(&vma->exec_node,
 164                                        &eb->buckets[handle & eb->and]);
 165                 }
 166                 ++i;
 167         }
 168
 169         return 0;
 170
 171
 172 err:
 173         while (!list_empty(&objects)) {
 174                 obj = list_first_entry(&objects,
 175                                        struct drm_i915_gem_object,
 176                                        obj_exec_link);
 177                 list_del_init(&obj->obj_exec_link);
 178                 drm_gem_object_unreference(&obj->base);
 179         }
 180         /*
 181          * Objects already transfered to the vmas list will be unreferenced by
 182          * eb_destroy.
 183          */
 184
 185         return ret;
 186 }
 187
 188 static struct i915_vma *eb_get_vma(struct eb_vmas *eb, unsigned long handle)
 189 {
 190         if (eb->and < 0) {
 191                 if (handle >= -eb->and)
 192                         return NULL;
 193                 return eb->lut[handle];
 194         } else {
 195                 struct hlist_head *head;
 196                 struct i915_vma *vma;
 197
 198                 head = &eb->buckets[handle & eb->and];
 199                 hlist_for_each_entry(vma, head, exec_node) {
 200                         if (vma->exec_handle == handle)
 201                                 return vma;
 202                 }
 203                 return NULL;
 204         }
 205 }
 206
 207 static void
 208 i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
 209 {
 210         struct drm_i915_gem_exec_object2 *entry;
 211         struct drm_i915_gem_object *obj = vma->obj;
 212
 213         if (!drm_mm_node_allocated(&vma->node))
 214                 return;
 215
 216         entry = vma->exec_entry;
 217
 218         if (entry->flags & __EXEC_OBJECT_HAS_FENCE)
 219                 i915_gem_object_unpin_fence(obj);
 220
 221         if (entry->flags & __EXEC_OBJECT_HAS_PIN)
 222                 vma->pin_count--;
 223
 224         entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
 225 }
 226
 227 static void eb_destroy(struct eb_vmas *eb)
 228 {
 229         while (!list_empty(&eb->vmas)) {
 230                 struct i915_vma *vma;
 231
 232                 vma = list_first_entry(&eb->vmas,
 233                                        struct i915_vma,
 234                                        exec_list);
 235                 list_del_init(&vma->exec_list);
 236                 i915_gem_execbuffer_unreserve_vma(vma);
 237                 drm_gem_object_unreference(&vma->obj->base);
 238         }
 239         kfree(eb);
 240 }
 241
 242 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 243 {
 244         return (HAS_LLC(obj->base.dev) ||
 245                 obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
 246                 obj->cache_level != I915_CACHE_NONE);
 247 }
 248
 249 /* Used to convert any address to canonical form.
 250  * Starting from gen8, some commands (e.g. STATE_BASE_ADDRESS,
 251  * MI_LOAD_REGISTER_MEM and others, see Broadwell PRM Vol2a) require the
 252  * addresses to be in a canonical form:
 253  * "GraphicsAddress[63:48] are ignored by the HW and assumed to be in correct
 254  * canonical form [63:48] == [47]."
 255  */
 256 #define GEN8_HIGH_ADDRESS_BIT 47
 257 static inline uint64_t gen8_canonical_addr(uint64_t address)
 258 {
 259         return sign_extend64(address, GEN8_HIGH_ADDRESS_BIT);
 260 }
 261
 262 static inline uint64_t gen8_noncanonical_addr(uint64_t address)
 263 {
 264         return address & ((1ULL << (GEN8_HIGH_ADDRESS_BIT + 1)) - 1);
 265 }
 266
 267 static inline uint64_t
 268 relocation_target(struct drm_i915_gem_relocation_entry *reloc,
 269                   uint64_t target_offset)
 270 {
 271         return gen8_canonical_addr((int)reloc->delta + target_offset);
 272 }
 273
 274 static int
 275 relocate_entry_cpu(struct drm_i915_gem_object *obj,
 276                    struct drm_i915_gem_relocation_entry *reloc,
 277                    uint64_t target_offset)
 278 {
 279         struct drm_device *dev = obj->base.dev;
 280         uint32_t page_offset = offset_in_page(reloc->offset);
 281         uint64_t delta = relocation_target(reloc, target_offset);
 282         char *vaddr;
 283         int ret;
 284
 285         ret = i915_gem_object_set_to_cpu_domain(obj, true);
 286         if (ret)
 287                 return ret;
 288
 289         vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
 290                                 reloc->offset >> PAGE_SHIFT));
 291         *(uint32_t *)(vaddr + page_offset) = lower_32_bits(delta);
 292
 293         if (INTEL_INFO(dev)->gen >= 8) {
 294                 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
 295
 296                 if (page_offset == 0) {
 297                         kunmap_atomic(vaddr);
 298                         vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
 299                             (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
 300                 }
 301
 302                 *(uint32_t *)(vaddr + page_offset) = upper_32_bits(delta);
 303         }
 304
 305         kunmap_atomic(vaddr);
 306
 307         return 0;
 308 }
 309
 310 static int
 311 relocate_entry_gtt(struct drm_i915_gem_object *obj,
 312                    struct drm_i915_gem_relocation_entry *reloc,
 313                    uint64_t target_offset)
 314 {
 315         struct drm_device *dev = obj->base.dev;
 316         struct drm_i915_private *dev_priv = dev->dev_private;
 317         uint64_t delta = relocation_target(reloc, target_offset);
 318         uint64_t offset;
 319         void __iomem *reloc_page;
 320         int ret;
 321
 322         ret = i915_gem_object_set_to_gtt_domain(obj, true);
 323         if (ret)
 324                 return ret;
 325
 326         ret = i915_gem_object_put_fence(obj);
 327         if (ret)
 328                 return ret;
 329
 330         /* Map the page containing the relocation we're going to perform.  */
 331         offset = i915_gem_obj_ggtt_offset(obj);
 332         offset += reloc->offset;
 333         reloc_page = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 334                                               offset & PAGE_MASK);
 335         iowrite32(lower_32_bits(delta), reloc_page + offset_in_page(offset));
 336
 337         if (INTEL_INFO(dev)->gen >= 8) {
 338                 offset += sizeof(uint32_t);
 339
 340                 if (offset_in_page(offset) == 0) {
 341                         io_mapping_unmap_atomic(reloc_page);
 342                         reloc_page =
 343                                 io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 344                                                          offset);
 345                 }
 346
 347                 iowrite32(upper_32_bits(delta),
 348                           reloc_page + offset_in_page(offset));
 349         }
 350
 351         io_mapping_unmap_atomic(reloc_page);
 352
 353         return 0;
 354 }
 355
 356 static void
 357 clflush_write32(void *addr, uint32_t value)
 358 {
 359         /* This is not a fast path, so KISS. */
 360         drm_clflush_virt_range(addr, sizeof(uint32_t));
 361         *(uint32_t *)addr = value;
 362         drm_clflush_virt_range(addr, sizeof(uint32_t));
 363 }
 364
 365 static int
 366 relocate_entry_clflush(struct drm_i915_gem_object *obj,
 367                        struct drm_i915_gem_relocation_entry *reloc,
 368                        uint64_t target_offset)
 369 {
 370         struct drm_device *dev = obj->base.dev;
 371         uint32_t page_offset = offset_in_page(reloc->offset);
 372         uint64_t delta = relocation_target(reloc, target_offset);
 373         char *vaddr;
 374         int ret;
 375
 376         ret = i915_gem_object_set_to_gtt_domain(obj, true);
 377         if (ret)
 378                 return ret;
 379
 380         vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
 381                                 reloc->offset >> PAGE_SHIFT));
 382         clflush_write32(vaddr + page_offset, lower_32_bits(delta));
 383
 384         if (INTEL_INFO(dev)->gen >= 8) {
 385                 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
 386
 387                 if (page_offset == 0) {
 388                         kunmap_atomic(vaddr);
 389                         vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
 390                             (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
 391                 }
 392
 393                 clflush_write32(vaddr + page_offset, upper_32_bits(delta));
 394         }
 395
 396         kunmap_atomic(vaddr);
 397
 398         return 0;
 399 }
 400
 401 static int
 402 i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
 403                                    struct eb_vmas *eb,
 404                                    struct drm_i915_gem_relocation_entry *reloc)
 405 {
 406         struct drm_device *dev = obj->base.dev;
 407         struct drm_gem_object *target_obj;
 408         struct drm_i915_gem_object *target_i915_obj;
 409         struct i915_vma *target_vma;
 410         uint64_t target_offset;
 411         int ret;
 412
 413         /* we've already hold a reference to all valid objects */
 414         target_vma = eb_get_vma(eb, reloc->target_handle);
 415         if (unlikely(target_vma == NULL))
 416                 return -ENOENT;
 417         target_i915_obj = target_vma->obj;
 418         target_obj = &target_vma->obj->base;
 419
 420         target_offset = gen8_canonical_addr(target_vma->node.start);
 421
 422         /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
 423          * pipe_control writes because the gpu doesn't properly redirect them
 424          * through the ppgtt for non_secure batchbuffers. */
 425         if (unlikely(IS_GEN6(dev) &&
 426             reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION)) {
 427                 ret = i915_vma_bind(target_vma, target_i915_obj->cache_level,
 428                                     PIN_GLOBAL);
 429                 if (WARN_ONCE(ret, "Unexpected failure to bind target VMA!"))
 430                         return ret;
 431         }
 432
 433         /* Validate that the target is in a valid r/w GPU domain */
 434         if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
 435                 DRM_DEBUG("reloc with multiple write domains: "
 436                           "obj %p target %d offset %d "
 437                           "read %08x write %08x",
 438                           obj, reloc->target_handle,
 439                           (int) reloc->offset,
 440                           reloc->read_domains,
 441                           reloc->write_domain);
 442                 return -EINVAL;
 443         }
 444         if (unlikely((reloc->write_domain | reloc->read_domains)
 445                      & ~I915_GEM_GPU_DOMAINS)) {
 446                 DRM_DEBUG("reloc with read/write non-GPU domains: "
 447                           "obj %p target %d offset %d "
 448                           "read %08x write %08x",
 449                           obj, reloc->target_handle,
 450                           (int) reloc->offset,
 451                           reloc->read_domains,
 452                           reloc->write_domain);
 453                 return -EINVAL;
 454         }
 455
 456         target_obj->pending_read_domains |= reloc->read_domains;
 457         target_obj->pending_write_domain |= reloc->write_domain;
 458
 459         /* If the relocation already has the right value in it, no
 460          * more work needs to be done.
 461          */
 462         if (target_offset == reloc->presumed_offset)
 463                 return 0;
 464
 465         /* Check that the relocation address is valid... */
 466         if (unlikely(reloc->offset >
 467                 obj->base.size - (INTEL_INFO(dev)->gen >= 8 ? 8 : 4))) {
 468                 DRM_DEBUG("Relocation beyond object bounds: "
 469                           "obj %p target %d offset %d size %d.\n",
 470                           obj, reloc->target_handle,
 471                           (int) reloc->offset,
 472                           (int) obj->base.size);
 473                 return -EINVAL;
 474         }
 475         if (unlikely(reloc->offset & 3)) {
 476                 DRM_DEBUG("Relocation not 4-byte aligned: "
 477                           "obj %p target %d offset %d.\n",
 478                           obj, reloc->target_handle,
 479                           (int) reloc->offset);
 480                 return -EINVAL;
 481         }
 482
 483         /* We can't wait for rendering with pagefaults disabled */
 484         if (obj->active && pagefault_disabled())
 485                 return -EFAULT;
 486
 487         if (use_cpu_reloc(obj))
 488                 ret = relocate_entry_cpu(obj, reloc, target_offset);
 489         else if (obj->map_and_fenceable)
 490                 ret = relocate_entry_gtt(obj, reloc, target_offset);
 491         else if (static_cpu_has(X86_FEATURE_CLFLUSH))
 492                 ret = relocate_entry_clflush(obj, reloc, target_offset);
 493         else {
 494                 WARN_ONCE(1, "Impossible case in relocation handling\n");
 495                 ret = -ENODEV;
 496         }
 497
 498         if (ret)
 499                 return ret;
 500
 501         /* and update the user's relocation entry */
 502         reloc->presumed_offset = target_offset;
 503
 504         return 0;
 505 }
 506
 507 static int
 508 i915_gem_execbuffer_relocate_vma(struct i915_vma *vma,
 509                                  struct eb_vmas *eb)
 510 {
 511 #define N_RELOC(x) ((x) / sizeof(struct drm_i915_gem_relocation_entry))
 512         struct drm_i915_gem_relocation_entry stack_reloc[N_RELOC(512)];
 513         struct drm_i915_gem_relocation_entry __user *user_relocs;
 514         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 515         int remain, ret;
 516
 517         user_relocs = to_user_ptr(entry->relocs_ptr);
 518
 519         remain = entry->relocation_count;
 520         while (remain) {
 521                 struct drm_i915_gem_relocation_entry *r = stack_reloc;
 522                 int count = remain;
 523                 if (count > ARRAY_SIZE(stack_reloc))
 524                         count = ARRAY_SIZE(stack_reloc);
 525                 remain -= count;
 526
 527                 if (__copy_from_user_inatomic(r, user_relocs, count*sizeof(r[0])))
 528                         return -EFAULT;
 529
 530                 do {
 531                         u64 offset = r->presumed_offset;
 532
 533                         ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, r);
 534                         if (ret)
 535                                 return ret;
 536
 537                         if (r->presumed_offset != offset &&
 538                             __copy_to_user_inatomic(&user_relocs->presumed_offset,
 539                                                     &r->presumed_offset,
 540                                                     sizeof(r->presumed_offset))) {
 541                                 return -EFAULT;
 542                         }
 543
 544                         user_relocs++;
 545                         r++;
 546                 } while (--count);
 547         }
 548
 549         return 0;
 550 #undef N_RELOC
 551 }
 552
 553 static int
 554 i915_gem_execbuffer_relocate_vma_slow(struct i915_vma *vma,
 555                                       struct eb_vmas *eb,
 556                                       struct drm_i915_gem_relocation_entry *relocs)
 557 {
 558         const struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 559         int i, ret;
 560
 561         for (i = 0; i < entry->relocation_count; i++) {
 562                 ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, &relocs[i]);
 563                 if (ret)
 564                         return ret;
 565         }
 566
 567         return 0;
 568 }
 569
 570 static int
 571 i915_gem_execbuffer_relocate(struct eb_vmas *eb)
 572 {
 573         struct i915_vma *vma;
 574         int ret = 0;
 575
 576         /* This is the fast path and we cannot handle a pagefault whilst
 577          * holding the struct mutex lest the user pass in the relocations
 578          * contained within a mmaped bo. For in such a case we, the page
 579          * fault handler would call i915_gem_fault() and we would try to
 580          * acquire the struct mutex again. Obviously this is bad and so
 581          * lockdep complains vehemently.
 582          */
 583         pagefault_disable();
 584         list_for_each_entry(vma, &eb->vmas, exec_list) {
 585                 ret = i915_gem_execbuffer_relocate_vma(vma, eb);
 586                 if (ret)
 587                         break;
 588         }
 589         pagefault_enable();
 590
 591         return ret;
 592 }
 593
 594 static bool only_mappable_for_reloc(unsigned int flags)
 595 {
 596         return (flags & (EXEC_OBJECT_NEEDS_FENCE | __EXEC_OBJECT_NEEDS_MAP)) ==
 597                 __EXEC_OBJECT_NEEDS_MAP;
 598 }
 599
 600 static int
 601 i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
 602                                 struct intel_engine_cs *ring,
 603                                 bool *need_reloc)
 604 {
 605         struct drm_i915_gem_object *obj = vma->obj;
 606         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 607         uint64_t flags;
 608         int ret;
 609
 610         flags = PIN_USER;
 611         if (entry->flags & EXEC_OBJECT_NEEDS_GTT)
 612                 flags |= PIN_GLOBAL;
 613
 614         if (!drm_mm_node_allocated(&vma->node)) {
 615                 /* Wa32bitGeneralStateOffset & Wa32bitInstructionBaseOffset,
 616                  * limit address to the first 4GBs for unflagged objects.
 617                  */
 618                 if ((entry->flags & EXEC_OBJECT_SUPPORTS_48B_ADDRESS) == 0)
 619                         flags |= PIN_ZONE_4G;
 620                 if (entry->flags & __EXEC_OBJECT_NEEDS_MAP)
 621                         flags |= PIN_GLOBAL | PIN_MAPPABLE;
 622                 if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS)
 623                         flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
 624                 if (entry->flags & EXEC_OBJECT_PINNED)
 625                         flags |= entry->offset | PIN_OFFSET_FIXED;
 626                 if ((flags & PIN_MAPPABLE) == 0)
 627                         flags |= PIN_HIGH;
 628         }
 629
 630         ret = i915_gem_object_pin(obj, vma->vm, entry->alignment, flags);
 631         if ((ret == -ENOSPC  || ret == -E2BIG) &&
 632             only_mappable_for_reloc(entry->flags))
 633                 ret = i915_gem_object_pin(obj, vma->vm,
 634                                           entry->alignment,
 635                                           flags & ~PIN_MAPPABLE);
 636         if (ret)
 637                 return ret;
 638
 639         entry->flags |= __EXEC_OBJECT_HAS_PIN;
 640
 641         if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
 642                 ret = i915_gem_object_get_fence(obj);
 643                 if (ret)
 644                         return ret;
 645
 646                 if (i915_gem_object_pin_fence(obj))
 647                         entry->flags |= __EXEC_OBJECT_HAS_FENCE;
 648         }
 649
 650         if (entry->offset != vma->node.start) {
 651                 entry->offset = vma->node.start;
 652                 *need_reloc = true;
 653         }
 654
 655         if (entry->flags & EXEC_OBJECT_WRITE) {
 656                 obj->base.pending_read_domains = I915_GEM_DOMAIN_RENDER;
 657                 obj->base.pending_write_domain = I915_GEM_DOMAIN_RENDER;
 658         }
 659
 660         return 0;
 661 }
 662
 663 static bool
 664 need_reloc_mappable(struct i915_vma *vma)
 665 {
 666         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 667
 668         if (entry->relocation_count == 0)
 669                 return false;
 670
 671         if (!vma->is_ggtt)
 672                 return false;
 673
 674         /* See also use_cpu_reloc() */
 675         if (HAS_LLC(vma->obj->base.dev))
 676                 return false;
 677
 678         if (vma->obj->base.write_domain == I915_GEM_DOMAIN_CPU)
 679                 return false;
 680
 681         return true;
 682 }
 683
 684 static bool
 685 eb_vma_misplaced(struct i915_vma *vma)
 686 {
 687         struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
 688         struct drm_i915_gem_object *obj = vma->obj;
 689
 690         WARN_ON(entry->flags & __EXEC_OBJECT_NEEDS_MAP && !vma->is_ggtt);
 691
 692         if (entry->alignment &&
 693             vma->node.start & (entry->alignment - 1))
 694                 return true;
 695
 696         if (entry->flags & EXEC_OBJECT_PINNED &&
 697             vma->node.start != entry->offset)
 698                 return true;
 699
 700         if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS &&
 701             vma->node.start < BATCH_OFFSET_BIAS)
 702                 return true;
 703
 704         /* avoid costly ping-pong once a batch bo ended up non-mappable */
 705         if (entry->flags & __EXEC_OBJECT_NEEDS_MAP && !obj->map_and_fenceable)
 706                 return !only_mappable_for_reloc(entry->flags);
 707
 708         if ((entry->flags & EXEC_OBJECT_SUPPORTS_48B_ADDRESS) == 0 &&
 709             (vma->node.start + vma->node.size - 1) >> 32)
 710                 return true;
 711
 712         return false;
 713 }
 714
 715 static int
 716 i915_gem_execbuffer_reserve(struct intel_engine_cs *ring,
 717                             struct list_head *vmas,
 718                             struct intel_context *ctx,
 719                             bool *need_relocs)
 720 {
 721         struct drm_i915_gem_object *obj;
 722         struct i915_vma *vma;
 723         struct i915_address_space *vm;
 724         struct list_head ordered_vmas;
 725         struct list_head pinned_vmas;
 726         bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
 727         int retry;
 728
 729         i915_gem_retire_requests_ring(ring);
 730
 731         vm = list_first_entry(vmas, struct i915_vma, exec_list)->vm;
 732
 733         INIT_LIST_HEAD(&ordered_vmas);
 734         INIT_LIST_HEAD(&pinned_vmas);
 735         while (!list_empty(vmas)) {
 736                 struct drm_i915_gem_exec_object2 *entry;
 737                 bool need_fence, need_mappable;
 738
 739                 vma = list_first_entry(vmas, struct i915_vma, exec_list);
 740                 obj = vma->obj;
 741                 entry = vma->exec_entry;
 742
 743                 if (ctx->flags & CONTEXT_NO_ZEROMAP)
 744                         entry->flags |= __EXEC_OBJECT_NEEDS_BIAS;
 745
 746                 if (!has_fenced_gpu_access)
 747                         entry->flags &= ~EXEC_OBJECT_NEEDS_FENCE;
 748                 need_fence =
 749                         entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 750                         obj->tiling_mode != I915_TILING_NONE;
 751                 need_mappable = need_fence || need_reloc_mappable(vma);
 752
 753                 if (entry->flags & EXEC_OBJECT_PINNED)
 754                         list_move_tail(&vma->exec_list, &pinned_vmas);
 755                 else if (need_mappable) {
 756                         entry->flags |= __EXEC_OBJECT_NEEDS_MAP;
 757                         list_move(&vma->exec_list, &ordered_vmas);
 758                 } else
 759                         list_move_tail(&vma->exec_list, &ordered_vmas);
 760
 761                 obj->base.pending_read_domains = I915_GEM_GPU_DOMAINS & ~I915_GEM_DOMAIN_COMMAND;
 762                 obj->base.pending_write_domain = 0;
 763         }
 764         list_splice(&ordered_vmas, vmas);
 765         list_splice(&pinned_vmas, vmas);
 766
 767         /* Attempt to pin all of the buffers into the GTT.
 768          * This is done in 3 phases:
 769          *
 770          * 1a. Unbind all objects that do not match the GTT constraints for
 771          *     the execbuffer (fenceable, mappable, alignment etc).
 772          * 1b. Increment pin count for already bound objects.
 773          * 2.  Bind new objects.
 774          * 3.  Decrement pin count.
 775          *
 776          * This avoid unnecessary unbinding of later objects in order to make
 777          * room for the earlier objects *unless* we need to defragment.
 778          */
 779         retry = 0;
 780         do {
 781                 int ret = 0;
 782
 783                 /* Unbind any ill-fitting objects or pin. */
 784                 list_for_each_entry(vma, vmas, exec_list) {
 785                         if (!drm_mm_node_allocated(&vma->node))
 786                                 continue;
 787
 788                         if (eb_vma_misplaced(vma))
 789                                 ret = i915_vma_unbind(vma);
 790                         else
 791                                 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 792                         if (ret)
 793                                 goto err;
 794                 }
 795
 796                 /* Bind fresh objects */
 797                 list_for_each_entry(vma, vmas, exec_list) {
 798                         if (drm_mm_node_allocated(&vma->node))
 799                                 continue;
 800
 801                         ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
 802                         if (ret)
 803                                 goto err;
 804                 }
 805
 806 err:
 807                 if (ret != -ENOSPC || retry++)
 808                         return ret;
 809
 810                 /* Decrement pin count for bound objects */
 811                 list_for_each_entry(vma, vmas, exec_list)
 812                         i915_gem_execbuffer_unreserve_vma(vma);
 813
 814                 ret = i915_gem_evict_vm(vm, true);
 815                 if (ret)
 816                         return ret;
 817         } while (1);
 818 }
 819
 820 static int
 821 i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
 822                                   struct drm_i915_gem_execbuffer2 *args,
 823                                   struct drm_file *file,
 824                                   struct intel_engine_cs *ring,
 825                                   struct eb_vmas *eb,
 826                                   struct drm_i915_gem_exec_object2 *exec,
 827                                   struct intel_context *ctx)
 828 {
 829         struct drm_i915_gem_relocation_entry *reloc;
 830         struct i915_address_space *vm;
 831         struct i915_vma *vma;
 832         bool need_relocs;
 833         int *reloc_offset;
 834         int i, total, ret;
 835         unsigned count = args->buffer_count;
 836
 837         vm = list_first_entry(&eb->vmas, struct i915_vma, exec_list)->vm;
 838
 839         /* We may process another execbuffer during the unlock... */
 840         while (!list_empty(&eb->vmas)) {
 841                 vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
 842                 list_del_init(&vma->exec_list);
 843                 i915_gem_execbuffer_unreserve_vma(vma);
 844                 drm_gem_object_unreference(&vma->obj->base);
 845         }
 846
 847         mutex_unlock(&dev->struct_mutex);
 848
 849         total = 0;
 850         for (i = 0; i < count; i++)
 851                 total += exec[i].relocation_count;
 852
 853         reloc_offset = drm_malloc_ab(count, sizeof(*reloc_offset));
 854         reloc = drm_malloc_ab(total, sizeof(*reloc));
 855         if (reloc == NULL || reloc_offset == NULL) {
 856                 drm_free_large(reloc);
 857                 drm_free_large(reloc_offset);
 858                 mutex_lock(&dev->struct_mutex);
 859                 return -ENOMEM;
 860         }
 861
 862         total = 0;
 863         for (i = 0; i < count; i++) {
 864                 struct drm_i915_gem_relocation_entry __user *user_relocs;
 865                 u64 invalid_offset = (u64)-1;
 866                 int j;
 867
 868                 user_relocs = to_user_ptr(exec[i].relocs_ptr);
 869
 870                 if (copy_from_user(reloc+total, user_relocs,
 871                                    exec[i].relocation_count * sizeof(*reloc))) {
 872                         ret = -EFAULT;
 873                         mutex_lock(&dev->struct_mutex);
 874                         goto err;
 875                 }
 876
 877                 /* As we do not update the known relocation offsets after
 878                  * relocating (due to the complexities in lock handling),
 879                  * we need to mark them as invalid now so that we force the
 880                  * relocation processing next time. Just in case the target
 881                  * object is evicted and then rebound into its old
 882                  * presumed_offset before the next execbuffer - if that
 883                  * happened we would make the mistake of assuming that the
 884                  * relocations were valid.
 885                  */
 886                 for (j = 0; j < exec[i].relocation_count; j++) {
 887                         if (__copy_to_user(&user_relocs[j].presumed_offset,
 888                                            &invalid_offset,
 889                                            sizeof(invalid_offset))) {
 890                                 ret = -EFAULT;
 891                                 mutex_lock(&dev->struct_mutex);
 892                                 goto err;
 893                         }
 894                 }
 895
 896                 reloc_offset[i] = total;
 897                 total += exec[i].relocation_count;
 898         }
 899
 900         ret = i915_mutex_lock_interruptible(dev);
 901         if (ret) {
 902                 mutex_lock(&dev->struct_mutex);
 903                 goto err;
 904         }
 905
 906         /* reacquire the objects */
 907         eb_reset(eb);
 908         ret = eb_lookup_vmas(eb, exec, args, vm, file);
 909         if (ret)
 910                 goto err;
 911
 912         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
 913         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, ctx, &need_relocs);
 914         if (ret)
 915                 goto err;
 916
 917         list_for_each_entry(vma, &eb->vmas, exec_list) {
 918                 int offset = vma->exec_entry - exec;
 919                 ret = i915_gem_execbuffer_relocate_vma_slow(vma, eb,
 920                                                             reloc + reloc_offset[offset]);
 921                 if (ret)
 922                         goto err;
 923         }
 924
 925         /* Leave the user relocations as are, this is the painfully slow path,
 926          * and we want to avoid the complication of dropping the lock whilst
 927          * having buffers reserved in the aperture and so causing spurious
 928          * ENOSPC for random operations.
 929          */
 930
 931 err:
 932         drm_free_large(reloc);
 933         drm_free_large(reloc_offset);
 934         return ret;
 935 }
 936
 937 static int
 938 i915_gem_execbuffer_move_to_gpu(struct drm_i915_gem_request *req,
 939                                 struct list_head *vmas)
 940 {
 941         const unsigned other_rings = ~intel_ring_flag(req->ring);
 942         struct i915_vma *vma;
 943         uint32_t flush_domains = 0;
 944         bool flush_chipset = false;
 945         int ret;
 946
 947         list_for_each_entry(vma, vmas, exec_list) {
 948                 struct drm_i915_gem_object *obj = vma->obj;
 949
 950                 if (obj->active & other_rings) {
 951                         ret = i915_gem_object_sync(obj, req->ring, &req);
 952                         if (ret)
 953                                 return ret;
 954                 }
 955
 956                 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
 957                         flush_chipset |= i915_gem_clflush_object(obj, false);
 958
 959                 flush_domains |= obj->base.write_domain;
 960         }
 961
 962         if (flush_chipset)
 963                 i915_gem_chipset_flush(req->ring->dev);
 964
 965         if (flush_domains & I915_GEM_DOMAIN_GTT)
 966                 wmb();
 967
 968         /* Unconditionally invalidate gpu caches and ensure that we do flush
 969          * any residual writes from the previous batch.
 970          */
 971         return intel_ring_invalidate_all_caches(req);
 972 }
 973
 974 static bool
 975 i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
 976 {
 977         if (exec->flags & __I915_EXEC_UNKNOWN_FLAGS)
 978                 return false;
 979
 980         /* Kernel clipping was a DRI1 misfeature */
 981         if (exec->num_cliprects || exec->cliprects_ptr)
 982                 return false;
 983
 984         if (exec->DR4 == 0xffffffff) {
 985                 DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
 986                 exec->DR4 = 0;
 987         }
 988         if (exec->DR1 || exec->DR4)
 989                 return false;
 990
 991         if ((exec->batch_start_offset | exec->batch_len) & 0x7)
 992                 return false;
 993
 994         return true;
 995 }
 996
 997 static int
 998 validate_exec_list(struct drm_device *dev,
 999                    struct drm_i915_gem_exec_object2 *exec,
1000                    int count)
1001 {
1002         unsigned relocs_total = 0;
1003         unsigned relocs_max = UINT_MAX / sizeof(struct drm_i915_gem_relocation_entry);
1004         unsigned invalid_flags;
1005         int i;
1006
1007         invalid_flags = __EXEC_OBJECT_UNKNOWN_FLAGS;
1008         if (USES_FULL_PPGTT(dev))
1009                 invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
1010
1011         for (i = 0; i < count; i++) {
1012                 char __user *ptr = to_user_ptr(exec[i].relocs_ptr);
1013                 int length; /* limited by fault_in_pages_readable() */
1014
1015                 if (exec[i].flags & invalid_flags)
1016                         return -EINVAL;
1017
1018                 /* Offset can be used as input (EXEC_OBJECT_PINNED), reject
1019                  * any non-page-aligned or non-canonical addresses.
1020                  */
1021                 if (exec[i].flags & EXEC_OBJECT_PINNED) {
1022                         if (exec[i].offset !=
1023                             gen8_canonical_addr(exec[i].offset & PAGE_MASK))
1024                                 return -EINVAL;
1025
1026                         /* From drm_mm perspective address space is continuous,
1027                          * so from this point we're always using non-canonical
1028                          * form internally.
1029                          */
1030                         exec[i].offset = gen8_noncanonical_addr(exec[i].offset);
1031                 }
1032
1033                 if (exec[i].alignment && !is_power_of_2(exec[i].alignment))
1034                         return -EINVAL;
1035
1036                 /* First check for malicious input causing overflow in
1037                  * the worst case where we need to allocate the entire
1038                  * relocation tree as a single array.
1039                  */
1040                 if (exec[i].relocation_count > relocs_max - relocs_total)
1041                         return -EINVAL;
1042                 relocs_total += exec[i].relocation_count;
1043
1044                 length = exec[i].relocation_count *
1045                         sizeof(struct drm_i915_gem_relocation_entry);
1046                 /*
1047                  * We must check that the entire relocation array is safe
1048                  * to read, but since we may need to update the presumed
1049                  * offsets during execution, check for full write access.
1050                  */
1051                 if (!access_ok(VERIFY_WRITE, ptr, length))
1052                         return -EFAULT;
1053
1054                 if (likely(!i915.prefault_disable)) {
1055                         if (fault_in_multipages_readable(ptr, length))
1056                                 return -EFAULT;
1057                 }
1058         }
1059
1060         return 0;
1061 }
1062
1063 static struct intel_context *
1064 i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
1065                           struct intel_engine_cs *ring, const u32 ctx_id)
1066 {
1067         struct intel_context *ctx = NULL;
1068         struct i915_ctx_hang_stats *hs;
1069
1070         if (ring->id != RCS && ctx_id != DEFAULT_CONTEXT_HANDLE)
1071                 return ERR_PTR(-EINVAL);
1072
1073         ctx = i915_gem_context_get(file->driver_priv, ctx_id);
1074         if (IS_ERR(ctx))
1075                 return ctx;
1076
1077         hs = &ctx->hang_stats;
1078         if (hs->banned) {
1079                 DRM_DEBUG("Context %u tried to submit while banned\n", ctx_id);
1080                 return ERR_PTR(-EIO);
1081         }
1082
1083         if (i915.enable_execlists && !ctx->engine[ring->id].state) {
1084                 int ret = intel_lr_context_deferred_alloc(ctx, ring);
1085                 if (ret) {
1086                         DRM_DEBUG("Could not create LRC %u: %d\n", ctx_id, ret);
1087                         return ERR_PTR(ret);
1088                 }
1089         }
1090
1091         return ctx;
1092 }
1093
1094 void
1095 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
1096                                    struct drm_i915_gem_request *req)
1097 {
1098         struct intel_engine_cs *ring = i915_gem_request_get_ring(req);
1099         struct i915_vma *vma;
1100
1101         list_for_each_entry(vma, vmas, exec_list) {
1102                 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
1103                 struct drm_i915_gem_object *obj = vma->obj;
1104                 u32 old_read = obj->base.read_domains;
1105                 u32 old_write = obj->base.write_domain;
1106
1107                 obj->dirty = 1; /* be paranoid  */
1108                 obj->base.write_domain = obj->base.pending_write_domain;
1109                 if (obj->base.write_domain == 0)
1110                         obj->base.pending_read_domains |= obj->base.read_domains;
1111                 obj->base.read_domains = obj->base.pending_read_domains;
1112
1113                 i915_vma_move_to_active(vma, req);
1114                 if (obj->base.write_domain) {
1115                         i915_gem_request_assign(&obj->last_write_req, req);
1116
1117                         intel_fb_obj_invalidate(obj, ORIGIN_CS);
1118
1119                         /* update for the implicit flush after a batch */
1120                         obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
1121                 }
1122                 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
1123                         i915_gem_request_assign(&obj->last_fenced_req, req);
1124                         if (entry->flags & __EXEC_OBJECT_HAS_FENCE) {
1125                                 struct drm_i915_private *dev_priv = to_i915(ring->dev);
1126                                 list_move_tail(&dev_priv->fence_regs[obj->fence_reg].lru_list,
1127                                                &dev_priv->mm.fence_list);
1128                         }
1129                 }
1130
1131                 trace_i915_gem_object_change_domain(obj, old_read, old_write);
1132         }
1133 }
1134
1135 void
1136 i915_gem_execbuffer_retire_commands(struct i915_execbuffer_params *params)
1137 {
1138         /* Unconditionally force add_request to emit a full flush. */
1139         params->ring->gpu_caches_dirty = true;
1140
1141         /* Add a breadcrumb for the completion of the batch buffer */
1142         __i915_add_request(params->request, params->batch_obj, true);
1143 }
1144
1145 static int
1146 i915_reset_gen7_sol_offsets(struct drm_device *dev,
1147                             struct drm_i915_gem_request *req)
1148 {
1149         struct intel_engine_cs *ring = req->ring;
1150         struct drm_i915_private *dev_priv = dev->dev_private;
1151         int ret, i;
1152
1153         if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS]) {
1154                 DRM_DEBUG("sol reset is gen7/rcs only\n");
1155                 return -EINVAL;
1156         }
1157
1158         ret = intel_ring_begin(req, 4 * 3);
1159         if (ret)
1160                 return ret;
1161
1162         for (i = 0; i < 4; i++) {
1163                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1164                 intel_ring_emit_reg(ring, GEN7_SO_WRITE_OFFSET(i));
1165                 intel_ring_emit(ring, 0);
1166         }
1167
1168         intel_ring_advance(ring);
1169
1170         return 0;
1171 }
1172
1173 static struct drm_i915_gem_object*
1174 i915_gem_execbuffer_parse(struct intel_engine_cs *ring,
1175                           struct drm_i915_gem_exec_object2 *shadow_exec_entry,
1176                           struct eb_vmas *eb,
1177                           struct drm_i915_gem_object *batch_obj,
1178                           u32 batch_start_offset,
1179                           u32 batch_len,
1180                           bool is_master)
1181 {
1182         struct drm_i915_gem_object *shadow_batch_obj;
1183         struct i915_vma *vma;
1184         int ret;
1185
1186         shadow_batch_obj = i915_gem_batch_pool_get(&ring->batch_pool,
1187                                                    PAGE_ALIGN(batch_len));
1188         if (IS_ERR(shadow_batch_obj))
1189                 return shadow_batch_obj;
1190
1191         ret = i915_parse_cmds(ring,
1192                               batch_obj,
1193                               shadow_batch_obj,
1194                               batch_start_offset,
1195                               batch_len,
1196                               is_master);
1197         if (ret)
1198                 goto err;
1199
1200         ret = i915_gem_obj_ggtt_pin(shadow_batch_obj, 0, 0);
1201         if (ret)
1202                 goto err;
1203
1204         i915_gem_object_unpin_pages(shadow_batch_obj);
1205
1206         memset(shadow_exec_entry, 0, sizeof(*shadow_exec_entry));
1207
1208         vma = i915_gem_obj_to_ggtt(shadow_batch_obj);
1209         vma->exec_entry = shadow_exec_entry;
1210         vma->exec_entry->flags = __EXEC_OBJECT_HAS_PIN;
1211         drm_gem_object_reference(&shadow_batch_obj->base);
1212         list_add_tail(&vma->exec_list, &eb->vmas);
1213
1214         shadow_batch_obj->base.pending_read_domains = I915_GEM_DOMAIN_COMMAND;
1215
1216         return shadow_batch_obj;
1217
1218 err:
1219         i915_gem_object_unpin_pages(shadow_batch_obj);
1220         if (ret == -EACCES) /* unhandled chained batch */
1221                 return batch_obj;
1222         else
1223                 return ERR_PTR(ret);
1224 }
1225
1226 int
1227 i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
1228                                struct drm_i915_gem_execbuffer2 *args,
1229                                struct list_head *vmas)
1230 {
1231         struct drm_device *dev = params->dev;
1232         struct intel_engine_cs *ring = params->ring;
1233         struct drm_i915_private *dev_priv = dev->dev_private;
1234         u64 exec_start, exec_len;
1235         int instp_mode;
1236         u32 instp_mask;
1237         int ret;
1238
1239         ret = i915_gem_execbuffer_move_to_gpu(params->request, vmas);
1240         if (ret)
1241                 return ret;
1242
1243         ret = i915_switch_context(params->request);
1244         if (ret)
1245                 return ret;
1246
1247         WARN(params->ctx->ppgtt && params->ctx->ppgtt->pd_dirty_rings & (1<<ring->id),
1248              "%s didn't clear reload\n", ring->name);
1249
1250         instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
1251         instp_mask = I915_EXEC_CONSTANTS_MASK;
1252         switch (instp_mode) {
1253         case I915_EXEC_CONSTANTS_REL_GENERAL:
1254         case I915_EXEC_CONSTANTS_ABSOLUTE:
1255         case I915_EXEC_CONSTANTS_REL_SURFACE:
1256                 if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
1257                         DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
1258                         return -EINVAL;
1259                 }
1260
1261                 if (instp_mode != dev_priv->relative_constants_mode) {
1262                         if (INTEL_INFO(dev)->gen < 4) {
1263                                 DRM_DEBUG("no rel constants on pre-gen4\n");
1264                                 return -EINVAL;
1265                         }
1266
1267                         if (INTEL_INFO(dev)->gen > 5 &&
1268                             instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
1269                                 DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
1270                                 return -EINVAL;
1271                         }
1272
1273                         /* The HW changed the meaning on this bit on gen6 */
1274                         if (INTEL_INFO(dev)->gen >= 6)
1275                                 instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
1276                 }
1277                 break;
1278         default:
1279                 DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
1280                 return -EINVAL;
1281         }
1282
1283         if (ring == &dev_priv->ring[RCS] &&
1284             instp_mode != dev_priv->relative_constants_mode) {
1285                 ret = intel_ring_begin(params->request, 4);
1286                 if (ret)
1287                         return ret;
1288
1289                 intel_ring_emit(ring, MI_NOOP);
1290                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1291                 intel_ring_emit_reg(ring, INSTPM);
1292                 intel_ring_emit(ring, instp_mask << 16 | instp_mode);
1293                 intel_ring_advance(ring);
1294
1295                 dev_priv->relative_constants_mode = instp_mode;
1296         }
1297
1298         if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
1299                 ret = i915_reset_gen7_sol_offsets(dev, params->request);
1300                 if (ret)
1301                         return ret;
1302         }
1303
1304         exec_len   = args->batch_len;
1305         exec_start = params->batch_obj_vm_offset +
1306                      params->args_batch_start_offset;
1307
1308         if (exec_len == 0)
1309                 exec_len = params->batch_obj->base.size;
1310
1311         ret = ring->dispatch_execbuffer(params->request,
1312                                         exec_start, exec_len,
1313                                         params->dispatch_flags);
1314         if (ret)
1315                 return ret;
1316
1317         trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);
1318
1319         i915_gem_execbuffer_move_to_active(vmas, params->request);
1320         i915_gem_execbuffer_retire_commands(params);
1321
1322         return 0;
1323 }
1324
1325 /**
1326  * Find one BSD ring to dispatch the corresponding BSD command.
1327  * The ring index is returned.
1328  */
1329 static unsigned int
1330 gen8_dispatch_bsd_ring(struct drm_i915_private *dev_priv, struct drm_file *file)
1331 {
1332         struct drm_i915_file_private *file_priv = file->driver_priv;
1333
1334         /* Check whether the file_priv has already selected one ring. */
1335         if ((int)file_priv->bsd_ring < 0) {
1336                 /* If not, use the ping-pong mechanism to select one. */
1337                 mutex_lock(&dev_priv->dev->struct_mutex);
1338                 file_priv->bsd_ring = dev_priv->mm.bsd_ring_dispatch_index;
1339                 dev_priv->mm.bsd_ring_dispatch_index ^= 1;
1340                 mutex_unlock(&dev_priv->dev->struct_mutex);
1341         }
1342
1343         return file_priv->bsd_ring;
1344 }
1345
1346 static struct drm_i915_gem_object *
1347 eb_get_batch(struct eb_vmas *eb)
1348 {
1349         struct i915_vma *vma = list_entry(eb->vmas.prev, typeof(*vma), exec_list);
1350
1351         /*
1352          * SNA is doing fancy tricks with compressing batch buffers, which leads
1353          * to negative relocation deltas. Usually that works out ok since the
1354          * relocate address is still positive, except when the batch is placed
1355          * very low in the GTT. Ensure this doesn't happen.
1356          *
1357          * Note that actual hangs have only been observed on gen7, but for
1358          * paranoia do it everywhere.
1359          */
1360         if ((vma->exec_entry->flags & EXEC_OBJECT_PINNED) == 0)
1361                 vma->exec_entry->flags |= __EXEC_OBJECT_NEEDS_BIAS;
1362
1363         return vma->obj;
1364 }
1365
1366 #define I915_USER_RINGS (4)
1367
1368 static const enum intel_ring_id user_ring_map[I915_USER_RINGS + 1] = {
1369         [I915_EXEC_DEFAULT]     = RCS,
1370         [I915_EXEC_RENDER]      = RCS,
1371         [I915_EXEC_BLT]         = BCS,
1372         [I915_EXEC_BSD]         = VCS,
1373         [I915_EXEC_VEBOX]       = VECS
1374 };
1375
1376 static int
1377 eb_select_ring(struct drm_i915_private *dev_priv,
1378                struct drm_file *file,
1379                struct drm_i915_gem_execbuffer2 *args,
1380                struct intel_engine_cs **ring)
1381 {
1382         unsigned int user_ring_id = args->flags & I915_EXEC_RING_MASK;
1383
1384         if (user_ring_id > I915_USER_RINGS) {
1385                 DRM_DEBUG("execbuf with unknown ring: %u\n", user_ring_id);
1386                 return -EINVAL;
1387         }
1388
1389         if ((user_ring_id != I915_EXEC_BSD) &&
1390             ((args->flags & I915_EXEC_BSD_MASK) != 0)) {
1391                 DRM_DEBUG("execbuf with non bsd ring but with invalid "
1392                           "bsd dispatch flags: %d\n", (int)(args->flags));
1393                 return -EINVAL;
1394         }
1395
1396         if (user_ring_id == I915_EXEC_BSD && HAS_BSD2(dev_priv)) {
1397                 unsigned int bsd_idx = args->flags & I915_EXEC_BSD_MASK;
1398
1399                 if (bsd_idx == I915_EXEC_BSD_DEFAULT) {
1400                         bsd_idx = gen8_dispatch_bsd_ring(dev_priv, file);
1401                 } else if (bsd_idx >= I915_EXEC_BSD_RING1 &&
1402                            bsd_idx <= I915_EXEC_BSD_RING2) {
1403                         bsd_idx >>= I915_EXEC_BSD_SHIFT;
1404                         bsd_idx--;
1405                 } else {
1406                         DRM_DEBUG("execbuf with unknown bsd ring: %u\n",
1407                                   bsd_idx);
1408                         return -EINVAL;
1409                 }
1410
1411                 *ring = &dev_priv->ring[_VCS(bsd_idx)];
1412         } else {
1413                 *ring = &dev_priv->ring[user_ring_map[user_ring_id]];
1414         }
1415
1416         if (!intel_ring_initialized(*ring)) {
1417                 DRM_DEBUG("execbuf with invalid ring: %u\n", user_ring_id);
1418                 return -EINVAL;
1419         }
1420
1421         return 0;
1422 }
1423
1424 static int
1425 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
1426                        struct drm_file *file,
1427                        struct drm_i915_gem_execbuffer2 *args,
1428                        struct drm_i915_gem_exec_object2 *exec)
1429 {
1430         struct drm_i915_private *dev_priv = dev->dev_private;
1431         struct drm_i915_gem_request *req = NULL;
1432         struct eb_vmas *eb;
1433         struct drm_i915_gem_object *batch_obj;
1434         struct drm_i915_gem_exec_object2 shadow_exec_entry;
1435         struct intel_engine_cs *ring;
1436         struct intel_context *ctx;
1437         struct i915_address_space *vm;
1438         struct i915_execbuffer_params params_master; /* XXX: will be removed later */
1439         struct i915_execbuffer_params *params = &params_master;
1440         const u32 ctx_id = i915_execbuffer2_get_context_id(*args);
1441         u32 dispatch_flags;
1442         int ret;
1443         bool need_relocs;
1444
1445         if (!i915_gem_check_execbuffer(args))
1446                 return -EINVAL;
1447
1448         ret = validate_exec_list(dev, exec, args->buffer_count);
1449         if (ret)
1450                 return ret;
1451
1452         dispatch_flags = 0;
1453         if (args->flags & I915_EXEC_SECURE) {
1454                 if (!file->is_master || !capable(CAP_SYS_ADMIN))
1455                     return -EPERM;
1456
1457                 dispatch_flags |= I915_DISPATCH_SECURE;
1458         }
1459         if (args->flags & I915_EXEC_IS_PINNED)
1460                 dispatch_flags |= I915_DISPATCH_PINNED;
1461
1462         ret = eb_select_ring(dev_priv, file, args, &ring);
1463         if (ret)
1464                 return ret;
1465
1466         if (args->buffer_count < 1) {
1467                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1468                 return -EINVAL;
1469         }
1470
1471         if (args->flags & I915_EXEC_RESOURCE_STREAMER) {
1472                 if (!HAS_RESOURCE_STREAMER(dev)) {
1473                         DRM_DEBUG("RS is only allowed for Haswell, Gen8 and above\n");
1474                         return -EINVAL;
1475                 }
1476                 if (ring->id != RCS) {
1477                         DRM_DEBUG("RS is not available on %s\n",
1478                                  ring->name);
1479                         return -EINVAL;
1480                 }
1481
1482                 dispatch_flags |= I915_DISPATCH_RS;
1483         }
1484
1485         intel_runtime_pm_get(dev_priv);
1486
1487         ret = i915_mutex_lock_interruptible(dev);
1488         if (ret)
1489                 goto pre_mutex_err;
1490
1491         ctx = i915_gem_validate_context(dev, file, ring, ctx_id);
1492         if (IS_ERR(ctx)) {
1493                 mutex_unlock(&dev->struct_mutex);
1494                 ret = PTR_ERR(ctx);
1495                 goto pre_mutex_err;
1496         }
1497
1498         i915_gem_context_reference(ctx);
1499
1500         if (ctx->ppgtt)
1501                 vm = &ctx->ppgtt->base;
1502         else
1503                 vm = &dev_priv->gtt.base;
1504
1505         memset(&params_master, 0x00, sizeof(params_master));
1506
1507         eb = eb_create(args);
1508         if (eb == NULL) {
1509                 i915_gem_context_unreference(ctx);
1510                 mutex_unlock(&dev->struct_mutex);
1511                 ret = -ENOMEM;
1512                 goto pre_mutex_err;
1513         }
1514
1515         /* Look up object handles */
1516         ret = eb_lookup_vmas(eb, exec, args, vm, file);
1517         if (ret)
1518                 goto err;
1519
1520         /* take note of the batch buffer before we might reorder the lists */
1521         batch_obj = eb_get_batch(eb);
1522
1523         /* Move the objects en-masse into the GTT, evicting if necessary. */
1524         need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
1525         ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, ctx, &need_relocs);
1526         if (ret)
1527                 goto err;
1528
1529         /* The objects are in their final locations, apply the relocations. */
1530         if (need_relocs)
1531                 ret = i915_gem_execbuffer_relocate(eb);
1532         if (ret) {
1533                 if (ret == -EFAULT) {
1534                         ret = i915_gem_execbuffer_relocate_slow(dev, args, file, ring,
1535                                                                 eb, exec, ctx);
1536                         BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1537                 }
1538                 if (ret)
1539                         goto err;
1540         }
1541
1542         /* Set the pending read domains for the batch buffer to COMMAND */
1543         if (batch_obj->base.pending_write_domain) {
1544                 DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
1545                 ret = -EINVAL;
1546                 goto err;
1547         }
1548
1549         params->args_batch_start_offset = args->batch_start_offset;
1550         if (i915_needs_cmd_parser(ring) && args->batch_len) {
1551                 struct drm_i915_gem_object *parsed_batch_obj;
1552
1553                 parsed_batch_obj = i915_gem_execbuffer_parse(ring,
1554                                                       &shadow_exec_entry,
1555                                                       eb,
1556                                                       batch_obj,
1557                                                       args->batch_start_offset,
1558                                                       args->batch_len,
1559                                                       file->is_master);
1560                 if (IS_ERR(parsed_batch_obj)) {
1561                         ret = PTR_ERR(parsed_batch_obj);
1562                         goto err;
1563                 }
1564
1565                 /*
1566                  * parsed_batch_obj == batch_obj means batch not fully parsed:
1567                  * Accept, but don't promote to secure.
1568                  */
1569
1570                 if (parsed_batch_obj != batch_obj) {
1571                         /*
1572                          * Batch parsed and accepted:
1573                          *
1574                          * Set the DISPATCH_SECURE bit to remove the NON_SECURE
1575                          * bit from MI_BATCH_BUFFER_START commands issued in
1576                          * the dispatch_execbuffer implementations. We
1577                          * specifically don't want that set on batches the
1578                          * command parser has accepted.
1579                          */
1580                         dispatch_flags |= I915_DISPATCH_SECURE;
1581                         params->args_batch_start_offset = 0;
1582                         batch_obj = parsed_batch_obj;
1583                 }
1584         }
1585
1586         batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
1587
1588         /* snb/ivb/vlv conflate the "batch in ppgtt" bit with the "non-secure
1589          * batch" bit. Hence we need to pin secure batches into the global gtt.
1590          * hsw should have this fixed, but bdw mucks it up again. */
1591         if (dispatch_flags & I915_DISPATCH_SECURE) {
1592                 /*
1593                  * So on first glance it looks freaky that we pin the batch here
1594                  * outside of the reservation loop. But:
1595                  * - The batch is already pinned into the relevant ppgtt, so we
1596                  *   already have the backing storage fully allocated.
1597                  * - No other BO uses the global gtt (well contexts, but meh),
1598                  *   so we don't really have issues with multiple objects not
1599                  *   fitting due to fragmentation.
1600                  * So this is actually safe.
1601                  */
1602                 ret = i915_gem_obj_ggtt_pin(batch_obj, 0, 0);
1603                 if (ret)
1604                         goto err;
1605
1606                 params->batch_obj_vm_offset = i915_gem_obj_ggtt_offset(batch_obj);
1607         } else
1608                 params->batch_obj_vm_offset = i915_gem_obj_offset(batch_obj, vm);
1609
1610         /* Allocate a request for this batch buffer nice and early. */
1611         req = i915_gem_request_alloc(ring, ctx);
1612         if (IS_ERR(req)) {
1613                 ret = PTR_ERR(req);
1614                 goto err_batch_unpin;
1615         }
1616
1617         ret = i915_gem_request_add_to_client(req, file);
1618         if (ret)
1619                 goto err_batch_unpin;
1620
1621         /*
1622          * Save assorted stuff away to pass through to *_submission().
1623          * NB: This data should be 'persistent' and not local as it will
1624          * kept around beyond the duration of the IOCTL once the GPU
1625          * scheduler arrives.
1626          */
1627         params->dev                     = dev;
1628         params->file                    = file;
1629         params->ring                    = ring;
1630         params->dispatch_flags          = dispatch_flags;
1631         params->batch_obj               = batch_obj;
1632         params->ctx                     = ctx;
1633         params->request                 = req;
1634
1635         ret = dev_priv->gt.execbuf_submit(params, args, &eb->vmas);
1636
1637 err_batch_unpin:
1638         /*
1639          * FIXME: We crucially rely upon the active tracking for the (ppgtt)
1640          * batch vma for correctness. For less ugly and less fragility this
1641          * needs to be adjusted to also track the ggtt batch vma properly as
1642          * active.
1643          */
1644         if (dispatch_flags & I915_DISPATCH_SECURE)
1645                 i915_gem_object_ggtt_unpin(batch_obj);
1646
1647 err:
1648         /* the request owns the ref now */
1649         i915_gem_context_unreference(ctx);
1650         eb_destroy(eb);
1651
1652         /*
1653          * If the request was created but not successfully submitted then it
1654          * must be freed again. If it was submitted then it is being tracked
1655          * on the active request list and no clean up is required here.
1656          */
1657         if (ret && !IS_ERR_OR_NULL(req))
1658                 i915_gem_request_cancel(req);
1659
1660         mutex_unlock(&dev->struct_mutex);
1661
1662 pre_mutex_err:
1663         /* intel_gpu_busy should also get a ref, so it will free when the device
1664          * is really idle. */
1665         intel_runtime_pm_put(dev_priv);
1666         return ret;
1667 }
1668
1669 /*
1670  * Legacy execbuffer just creates an exec2 list from the original exec object
1671  * list array and passes it to the real function.
1672  */
1673 int
1674 i915_gem_execbuffer(struct drm_device *dev, void *data,
1675                     struct drm_file *file)
1676 {
1677         struct drm_i915_gem_execbuffer *args = data;
1678         struct drm_i915_gem_execbuffer2 exec2;
1679         struct drm_i915_gem_exec_object *exec_list = NULL;
1680         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1681         int ret, i;
1682
1683         if (args->buffer_count < 1) {
1684                 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1685                 return -EINVAL;
1686         }
1687
1688         /* Copy in the exec list from userland */
1689         exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
1690         exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
1691         if (exec_list == NULL || exec2_list == NULL) {
1692                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1693                           args->buffer_count);
1694                 drm_free_large(exec_list);
1695                 drm_free_large(exec2_list);
1696                 return -ENOMEM;
1697         }
1698         ret = copy_from_user(exec_list,
1699                              to_user_ptr(args->buffers_ptr),
1700                              sizeof(*exec_list) * args->buffer_count);
1701         if (ret != 0) {
1702                 DRM_DEBUG("copy %d exec entries failed %d\n",
1703                           args->buffer_count, ret);
1704                 drm_free_large(exec_list);
1705                 drm_free_large(exec2_list);
1706                 return -EFAULT;
1707         }
1708
1709         for (i = 0; i < args->buffer_count; i++) {
1710                 exec2_list[i].handle = exec_list[i].handle;
1711                 exec2_list[i].relocation_count = exec_list[i].relocation_count;
1712                 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
1713                 exec2_list[i].alignment = exec_list[i].alignment;
1714                 exec2_list[i].offset = exec_list[i].offset;
1715                 if (INTEL_INFO(dev)->gen < 4)
1716                         exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
1717                 else
1718                         exec2_list[i].flags = 0;
1719         }
1720
1721         exec2.buffers_ptr = args->buffers_ptr;
1722         exec2.buffer_count = args->buffer_count;
1723         exec2.batch_start_offset = args->batch_start_offset;
1724         exec2.batch_len = args->batch_len;
1725         exec2.DR1 = args->DR1;
1726         exec2.DR4 = args->DR4;
1727         exec2.num_cliprects = args->num_cliprects;
1728         exec2.cliprects_ptr = args->cliprects_ptr;
1729         exec2.flags = I915_EXEC_RENDER;
1730         i915_execbuffer2_set_context_id(exec2, 0);
1731
1732         ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
1733         if (!ret) {
1734                 struct drm_i915_gem_exec_object __user *user_exec_list =
1735                         to_user_ptr(args->buffers_ptr);
1736
1737                 /* Copy the new buffer offsets back to the user's exec list. */
1738                 for (i = 0; i < args->buffer_count; i++) {
1739                         exec2_list[i].offset =
1740                                 gen8_canonical_addr(exec2_list[i].offset);
1741                         ret = __copy_to_user(&user_exec_list[i].offset,
1742                                              &exec2_list[i].offset,
1743                                              sizeof(user_exec_list[i].offset));
1744                         if (ret) {
1745                                 ret = -EFAULT;
1746                                 DRM_DEBUG("failed to copy %d exec entries "
1747                                           "back to user (%d)\n",
1748                                           args->buffer_count, ret);
1749                                 break;
1750                         }
1751                 }
1752         }
1753
1754         drm_free_large(exec_list);
1755         drm_free_large(exec2_list);
1756         return ret;
1757 }
1758
1759 int
1760 i915_gem_execbuffer2(struct drm_device *dev, void *data,
1761                      struct drm_file *file)
1762 {
1763         struct drm_i915_gem_execbuffer2 *args = data;
1764         struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1765         int ret;
1766
1767         if (args->buffer_count < 1 ||
1768             args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
1769                 DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
1770                 return -EINVAL;
1771         }
1772
1773         if (args->rsvd2 != 0) {
1774                 DRM_DEBUG("dirty rvsd2 field\n");
1775                 return -EINVAL;
1776         }
1777
1778         exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count,
1779                              GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
1780         if (exec2_list == NULL)
1781                 exec2_list = drm_malloc_ab(sizeof(*exec2_list),
1782                                            args->buffer_count);
1783         if (exec2_list == NULL) {
1784                 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1785                           args->buffer_count);
1786                 return -ENOMEM;
1787         }
1788         ret = copy_from_user(exec2_list,
1789                              to_user_ptr(args->buffers_ptr),
1790                              sizeof(*exec2_list) * args->buffer_count);
1791         if (ret != 0) {
1792                 DRM_DEBUG("copy %d exec entries failed %d\n",
1793                           args->buffer_count, ret);
1794                 drm_free_large(exec2_list);
1795                 return -EFAULT;
1796         }
1797
1798         ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list);
1799         if (!ret) {
1800                 /* Copy the new buffer offsets back to the user's exec list. */
1801                 struct drm_i915_gem_exec_object2 __user *user_exec_list =
1802                                    to_user_ptr(args->buffers_ptr);
1803                 int i;
1804
1805                 for (i = 0; i < args->buffer_count; i++) {
1806                         exec2_list[i].offset =
1807                                 gen8_canonical_addr(exec2_list[i].offset);
1808                         ret = __copy_to_user(&user_exec_list[i].offset,
1809                                              &exec2_list[i].offset,
1810                                              sizeof(user_exec_list[i].offset));
1811                         if (ret) {
1812                                 ret = -EFAULT;
1813                                 DRM_DEBUG("failed to copy %d exec entries "
1814                                           "back to user\n",
1815                                           args->buffer_count);
1816                                 break;
1817                         }
1818                 }
1819         }
1820
1821         drm_free_large(exec2_list);
1822         return ret;
1823 }