drivers/gpu/drm/i915/i915_gem.c

   1 /*
   2  * Copyright © 2008-2015 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  *
  26  */
  27
  28 #include <drm/drmP.h>
  29 #include <drm/drm_vma_manager.h>
  30 #include <drm/i915_drm.h>
  31 #include "i915_drv.h"
  32 #include "i915_vgpu.h"
  33 #include "i915_trace.h"
  34 #include "intel_drv.h"
  35 #include <linux/shmem_fs.h>
  36 #include <linux/slab.h>
  37 #include <linux/swap.h>
  38 #include <linux/pci.h>
  39 #include <linux/dma-buf.h>
  40
  41 static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
  42 static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj);
  43 static __must_check int
  44 i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
  45                                bool readonly);
  46 static void
  47 i915_gem_object_retire(struct drm_i915_gem_object *obj);
  48
  49 static void i915_gem_write_fence(struct drm_device *dev, int reg,
  50                                  struct drm_i915_gem_object *obj);
  51 static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
  52                                          struct drm_i915_fence_reg *fence,
  53                                          bool enable);
  54
  55 static bool cpu_cache_is_coherent(struct drm_device *dev,
  56                                   enum i915_cache_level level)
  57 {
  58         return HAS_LLC(dev) || level != I915_CACHE_NONE;
  59 }
  60
  61 static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
  62 {
  63         if (!cpu_cache_is_coherent(obj->base.dev, obj->cache_level))
  64                 return true;
  65
  66         return obj->pin_display;
  67 }
  68
  69 static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)
  70 {
  71         if (obj->tiling_mode)
  72                 i915_gem_release_mmap(obj);
  73
  74         /* As we do not have an associated fence register, we will force
  75          * a tiling change if we ever need to acquire one.
  76          */
  77         obj->fence_dirty = false;
  78         obj->fence_reg = I915_FENCE_REG_NONE;
  79 }
  80
  81 /* some bookkeeping */
  82 static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
  83                                   size_t size)
  84 {
  85         spin_lock(&dev_priv->mm.object_stat_lock);
  86         dev_priv->mm.object_count++;
  87         dev_priv->mm.object_memory += size;
  88         spin_unlock(&dev_priv->mm.object_stat_lock);
  89 }
  90
  91 static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
  92                                      size_t size)
  93 {
  94         spin_lock(&dev_priv->mm.object_stat_lock);
  95         dev_priv->mm.object_count--;
  96         dev_priv->mm.object_memory -= size;
  97         spin_unlock(&dev_priv->mm.object_stat_lock);
  98 }
  99
 100 static int
 101 i915_gem_wait_for_error(struct i915_gpu_error *error)
 102 {
 103         int ret;
 104
 105 #define EXIT_COND (!i915_reset_in_progress(error) || \
 106                    i915_terminally_wedged(error))
 107         if (EXIT_COND)
 108                 return 0;
 109
 110         /*
 111          * Only wait 10 seconds for the gpu reset to complete to avoid hanging
 112          * userspace. If it takes that long something really bad is going on and
 113          * we should simply try to bail out and fail as gracefully as possible.
 114          */
 115         ret = wait_event_interruptible_timeout(error->reset_queue,
 116                                                EXIT_COND,
 117                                                10*HZ);
 118         if (ret == 0) {
 119                 DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
 120                 return -EIO;
 121         } else if (ret < 0) {
 122                 return ret;
 123         }
 124 #undef EXIT_COND
 125
 126         return 0;
 127 }
 128
 129 int i915_mutex_lock_interruptible(struct drm_device *dev)
 130 {
 131         struct drm_i915_private *dev_priv = dev->dev_private;
 132         int ret;
 133
 134         ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
 135         if (ret)
 136                 return ret;
 137
 138         ret = mutex_lock_interruptible(&dev->struct_mutex);
 139         if (ret)
 140                 return ret;
 141
 142         WARN_ON(i915_verify_lists(dev));
 143         return 0;
 144 }
 145
 146 int
 147 i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
 148                             struct drm_file *file)
 149 {
 150         struct drm_i915_private *dev_priv = dev->dev_private;
 151         struct drm_i915_gem_get_aperture *args = data;
 152         struct drm_i915_gem_object *obj;
 153         size_t pinned;
 154
 155         pinned = 0;
 156         mutex_lock(&dev->struct_mutex);
 157         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)
 158                 if (i915_gem_obj_is_pinned(obj))
 159                         pinned += i915_gem_obj_ggtt_size(obj);
 160         mutex_unlock(&dev->struct_mutex);
 161
 162         args->aper_size = dev_priv->gtt.base.total;
 163         args->aper_available_size = args->aper_size - pinned;
 164
 165         return 0;
 166 }
 167
 168 static int
 169 i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
 170 {
 171         struct address_space *mapping = file_inode(obj->base.filp)->i_mapping;
 172         char *vaddr = obj->phys_handle->vaddr;
 173         struct sg_table *st;
 174         struct scatterlist *sg;
 175         int i;
 176
 177         if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
 178                 return -EINVAL;
 179
 180         for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
 181                 struct page *page;
 182                 char *src;
 183
 184                 page = shmem_read_mapping_page(mapping, i);
 185                 if (IS_ERR(page))
 186                         return PTR_ERR(page);
 187
 188                 src = kmap_atomic(page);
 189                 memcpy(vaddr, src, PAGE_SIZE);
 190                 drm_clflush_virt_range(vaddr, PAGE_SIZE);
 191                 kunmap_atomic(src);
 192
 193                 page_cache_release(page);
 194                 vaddr += PAGE_SIZE;
 195         }
 196
 197         i915_gem_chipset_flush(obj->base.dev);
 198
 199         st = kmalloc(sizeof(*st), GFP_KERNEL);
 200         if (st == NULL)
 201                 return -ENOMEM;
 202
 203         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 204                 kfree(st);
 205                 return -ENOMEM;
 206         }
 207
 208         sg = st->sgl;
 209         sg->offset = 0;
 210         sg->length = obj->base.size;
 211
 212         sg_dma_address(sg) = obj->phys_handle->busaddr;
 213         sg_dma_len(sg) = obj->base.size;
 214
 215         obj->pages = st;
 216         obj->has_dma_mapping = true;
 217         return 0;
 218 }
 219
 220 static void
 221 i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj)
 222 {
 223         int ret;
 224
 225         BUG_ON(obj->madv == __I915_MADV_PURGED);
 226
 227         ret = i915_gem_object_set_to_cpu_domain(obj, true);
 228         if (ret) {
 229                 /* In the event of a disaster, abandon all caches and
 230                  * hope for the best.
 231                  */
 232                 WARN_ON(ret != -EIO);
 233                 obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU;
 234         }
 235
 236         if (obj->madv == I915_MADV_DONTNEED)
 237                 obj->dirty = 0;
 238
 239         if (obj->dirty) {
 240                 struct address_space *mapping = file_inode(obj->base.filp)->i_mapping;
 241                 char *vaddr = obj->phys_handle->vaddr;
 242                 int i;
 243
 244                 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
 245                         struct page *page;
 246                         char *dst;
 247
 248                         page = shmem_read_mapping_page(mapping, i);
 249                         if (IS_ERR(page))
 250                                 continue;
 251
 252                         dst = kmap_atomic(page);
 253                         drm_clflush_virt_range(vaddr, PAGE_SIZE);
 254                         memcpy(dst, vaddr, PAGE_SIZE);
 255                         kunmap_atomic(dst);
 256
 257                         set_page_dirty(page);
 258                         if (obj->madv == I915_MADV_WILLNEED)
 259                                 mark_page_accessed(page);
 260                         page_cache_release(page);
 261                         vaddr += PAGE_SIZE;
 262                 }
 263                 obj->dirty = 0;
 264         }
 265
 266         sg_free_table(obj->pages);
 267         kfree(obj->pages);
 268
 269         obj->has_dma_mapping = false;
 270 }
 271
 272 static void
 273 i915_gem_object_release_phys(struct drm_i915_gem_object *obj)
 274 {
 275         drm_pci_free(obj->base.dev, obj->phys_handle);
 276 }
 277
 278 static const struct drm_i915_gem_object_ops i915_gem_phys_ops = {
 279         .get_pages = i915_gem_object_get_pages_phys,
 280         .put_pages = i915_gem_object_put_pages_phys,
 281         .release = i915_gem_object_release_phys,
 282 };
 283
 284 static int
 285 drop_pages(struct drm_i915_gem_object *obj)
 286 {
 287         struct i915_vma *vma, *next;
 288         int ret;
 289
 290         drm_gem_object_reference(&obj->base);
 291         list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link)
 292                 if (i915_vma_unbind(vma))
 293                         break;
 294
 295         ret = i915_gem_object_put_pages(obj);
 296         drm_gem_object_unreference(&obj->base);
 297
 298         return ret;
 299 }
 300
 301 int
 302 i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
 303                             int align)
 304 {
 305         drm_dma_handle_t *phys;
 306         int ret;
 307
 308         if (obj->phys_handle) {
 309                 if ((unsigned long)obj->phys_handle->vaddr & (align -1))
 310                         return -EBUSY;
 311
 312                 return 0;
 313         }
 314
 315         if (obj->madv != I915_MADV_WILLNEED)
 316                 return -EFAULT;
 317
 318         if (obj->base.filp == NULL)
 319                 return -EINVAL;
 320
 321         ret = drop_pages(obj);
 322         if (ret)
 323                 return ret;
 324
 325         /* create a new object */
 326         phys = drm_pci_alloc(obj->base.dev, obj->base.size, align);
 327         if (!phys)
 328                 return -ENOMEM;
 329
 330         obj->phys_handle = phys;
 331         obj->ops = &i915_gem_phys_ops;
 332
 333         return i915_gem_object_get_pages(obj);
 334 }
 335
 336 static int
 337 i915_gem_phys_pwrite(struct drm_i915_gem_object *obj,
 338                      struct drm_i915_gem_pwrite *args,
 339                      struct drm_file *file_priv)
 340 {
 341         struct drm_device *dev = obj->base.dev;
 342         void *vaddr = obj->phys_handle->vaddr + args->offset;
 343         char __user *user_data = to_user_ptr(args->data_ptr);
 344         int ret = 0;
 345
 346         /* We manually control the domain here and pretend that it
 347          * remains coherent i.e. in the GTT domain, like shmem_pwrite.
 348          */
 349         ret = i915_gem_object_wait_rendering(obj, false);
 350         if (ret)
 351                 return ret;
 352
 353         intel_fb_obj_invalidate(obj, NULL, ORIGIN_CPU);
 354         if (__copy_from_user_inatomic_nocache(vaddr, user_data, args->size)) {
 355                 unsigned long unwritten;
 356
 357                 /* The physical object once assigned is fixed for the lifetime
 358                  * of the obj, so we can safely drop the lock and continue
 359                  * to access vaddr.
 360                  */
 361                 mutex_unlock(&dev->struct_mutex);
 362                 unwritten = copy_from_user(vaddr, user_data, args->size);
 363                 mutex_lock(&dev->struct_mutex);
 364                 if (unwritten) {
 365                         ret = -EFAULT;
 366                         goto out;
 367                 }
 368         }
 369
 370         drm_clflush_virt_range(vaddr, args->size);
 371         i915_gem_chipset_flush(dev);
 372
 373 out:
 374         intel_fb_obj_flush(obj, false);
 375         return ret;
 376 }
 377
 378 void *i915_gem_object_alloc(struct drm_device *dev)
 379 {
 380         struct drm_i915_private *dev_priv = dev->dev_private;
 381         return kmem_cache_zalloc(dev_priv->slab, GFP_KERNEL);
 382 }
 383
 384 void i915_gem_object_free(struct drm_i915_gem_object *obj)
 385 {
 386         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
 387         kmem_cache_free(dev_priv->slab, obj);
 388 }
 389
 390 static int
 391 i915_gem_create(struct drm_file *file,
 392                 struct drm_device *dev,
 393                 uint64_t size,
 394                 uint32_t *handle_p)
 395 {
 396         struct drm_i915_gem_object *obj;
 397         int ret;
 398         u32 handle;
 399
 400         size = roundup(size, PAGE_SIZE);
 401         if (size == 0)
 402                 return -EINVAL;
 403
 404         /* Allocate the new object */
 405         obj = i915_gem_alloc_object(dev, size);
 406         if (obj == NULL)
 407                 return -ENOMEM;
 408
 409         ret = drm_gem_handle_create(file, &obj->base, &handle);
 410         /* drop reference from allocate - handle holds it now */
 411         drm_gem_object_unreference_unlocked(&obj->base);
 412         if (ret)
 413                 return ret;
 414
 415         *handle_p = handle;
 416         return 0;
 417 }
 418
 419 int
 420 i915_gem_dumb_create(struct drm_file *file,
 421                      struct drm_device *dev,
 422                      struct drm_mode_create_dumb *args)
 423 {
 424         /* have to work out size/pitch and return them */
 425         args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 64);
 426         args->size = args->pitch * args->height;
 427         return i915_gem_create(file, dev,
 428                                args->size, &args->handle);
 429 }
 430
 431 /**
 432  * Creates a new mm object and returns a handle to it.
 433  */
 434 int
 435 i915_gem_create_ioctl(struct drm_device *dev, void *data,
 436                       struct drm_file *file)
 437 {
 438         struct drm_i915_gem_create *args = data;
 439
 440         return i915_gem_create(file, dev,
 441                                args->size, &args->handle);
 442 }
 443
 444 static inline int
 445 __copy_to_user_swizzled(char __user *cpu_vaddr,
 446                         const char *gpu_vaddr, int gpu_offset,
 447                         int length)
 448 {
 449         int ret, cpu_offset = 0;
 450
 451         while (length > 0) {
 452                 int cacheline_end = ALIGN(gpu_offset + 1, 64);
 453                 int this_length = min(cacheline_end - gpu_offset, length);
 454                 int swizzled_gpu_offset = gpu_offset ^ 64;
 455
 456                 ret = __copy_to_user(cpu_vaddr + cpu_offset,
 457                                      gpu_vaddr + swizzled_gpu_offset,
 458                                      this_length);
 459                 if (ret)
 460                         return ret + length;
 461
 462                 cpu_offset += this_length;
 463                 gpu_offset += this_length;
 464                 length -= this_length;
 465         }
 466
 467         return 0;
 468 }
 469
 470 static inline int
 471 __copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,
 472                           const char __user *cpu_vaddr,
 473                           int length)
 474 {
 475         int ret, cpu_offset = 0;
 476
 477         while (length > 0) {
 478                 int cacheline_end = ALIGN(gpu_offset + 1, 64);
 479                 int this_length = min(cacheline_end - gpu_offset, length);
 480                 int swizzled_gpu_offset = gpu_offset ^ 64;
 481
 482                 ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset,
 483                                        cpu_vaddr + cpu_offset,
 484                                        this_length);
 485                 if (ret)
 486                         return ret + length;
 487
 488                 cpu_offset += this_length;
 489                 gpu_offset += this_length;
 490                 length -= this_length;
 491         }
 492
 493         return 0;
 494 }
 495
 496 /*
 497  * Pins the specified object's pages and synchronizes the object with
 498  * GPU accesses. Sets needs_clflush to non-zero if the caller should
 499  * flush the object from the CPU cache.
 500  */
 501 int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
 502                                     int *needs_clflush)
 503 {
 504         int ret;
 505
 506         *needs_clflush = 0;
 507
 508         if (!obj->base.filp)
 509                 return -EINVAL;
 510
 511         if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {
 512                 /* If we're not in the cpu read domain, set ourself into the gtt
 513                  * read domain and manually flush cachelines (if required). This
 514                  * optimizes for the case when the gpu will dirty the data
 515                  * anyway again before the next pread happens. */
 516                 *needs_clflush = !cpu_cache_is_coherent(obj->base.dev,
 517                                                         obj->cache_level);
 518                 ret = i915_gem_object_wait_rendering(obj, true);
 519                 if (ret)
 520                         return ret;
 521
 522                 i915_gem_object_retire(obj);
 523         }
 524
 525         ret = i915_gem_object_get_pages(obj);
 526         if (ret)
 527                 return ret;
 528
 529         i915_gem_object_pin_pages(obj);
 530
 531         return ret;
 532 }
 533
 534 /* Per-page copy function for the shmem pread fastpath.
 535  * Flushes invalid cachelines before reading the target if
 536  * needs_clflush is set. */
 537 static int
 538 shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length,
 539                  char __user *user_data,
 540                  bool page_do_bit17_swizzling, bool needs_clflush)
 541 {
 542         char *vaddr;
 543         int ret;
 544
 545         if (unlikely(page_do_bit17_swizzling))
 546                 return -EINVAL;
 547
 548         vaddr = kmap_atomic(page);
 549         if (needs_clflush)
 550                 drm_clflush_virt_range(vaddr + shmem_page_offset,
 551                                        page_length);
 552         ret = __copy_to_user_inatomic(user_data,
 553                                       vaddr + shmem_page_offset,
 554                                       page_length);
 555         kunmap_atomic(vaddr);
 556
 557         return ret ? -EFAULT : 0;
 558 }
 559
 560 static void
 561 shmem_clflush_swizzled_range(char *addr, unsigned long length,
 562                              bool swizzled)
 563 {
 564         if (unlikely(swizzled)) {
 565                 unsigned long start = (unsigned long) addr;
 566                 unsigned long end = (unsigned long) addr + length;
 567
 568                 /* For swizzling simply ensure that we always flush both
 569                  * channels. Lame, but simple and it works. Swizzled
 570                  * pwrite/pread is far from a hotpath - current userspace
 571                  * doesn't use it at all. */
 572                 start = round_down(start, 128);
 573                 end = round_up(end, 128);
 574
 575                 drm_clflush_virt_range((void *)start, end - start);
 576         } else {
 577                 drm_clflush_virt_range(addr, length);
 578         }
 579
 580 }
 581
 582 /* Only difference to the fast-path function is that this can handle bit17
 583  * and uses non-atomic copy and kmap functions. */
 584 static int
 585 shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length,
 586                  char __user *user_data,
 587                  bool page_do_bit17_swizzling, bool needs_clflush)
 588 {
 589         char *vaddr;
 590         int ret;
 591
 592         vaddr = kmap(page);
 593         if (needs_clflush)
 594                 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
 595                                              page_length,
 596                                              page_do_bit17_swizzling);
 597
 598         if (page_do_bit17_swizzling)
 599                 ret = __copy_to_user_swizzled(user_data,
 600                                               vaddr, shmem_page_offset,
 601                                               page_length);
 602         else
 603                 ret = __copy_to_user(user_data,
 604                                      vaddr + shmem_page_offset,
 605                                      page_length);
 606         kunmap(page);
 607
 608         return ret ? - EFAULT : 0;
 609 }
 610
 611 static int
 612 i915_gem_shmem_pread(struct drm_device *dev,
 613                      struct drm_i915_gem_object *obj,
 614                      struct drm_i915_gem_pread *args,
 615                      struct drm_file *file)
 616 {
 617         char __user *user_data;
 618         ssize_t remain;
 619         loff_t offset;
 620         int shmem_page_offset, page_length, ret = 0;
 621         int obj_do_bit17_swizzling, page_do_bit17_swizzling;
 622         int prefaulted = 0;
 623         int needs_clflush = 0;
 624         struct sg_page_iter sg_iter;
 625
 626         user_data = to_user_ptr(args->data_ptr);
 627         remain = args->size;
 628
 629         obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
 630
 631         ret = i915_gem_obj_prepare_shmem_read(obj, &needs_clflush);
 632         if (ret)
 633                 return ret;
 634
 635         offset = args->offset;
 636
 637         for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents,
 638                          offset >> PAGE_SHIFT) {
 639                 struct page *page = sg_page_iter_page(&sg_iter);
 640
 641                 if (remain <= 0)
 642                         break;
 643
 644                 /* Operation in this page
 645                  *
 646                  * shmem_page_offset = offset within page in shmem file
 647                  * page_length = bytes to copy for this page
 648                  */
 649                 shmem_page_offset = offset_in_page(offset);
 650                 page_length = remain;
 651                 if ((shmem_page_offset + page_length) > PAGE_SIZE)
 652                         page_length = PAGE_SIZE - shmem_page_offset;
 653
 654                 page_do_bit17_swizzling = obj_do_bit17_swizzling &&
 655                         (page_to_phys(page) & (1 << 17)) != 0;
 656
 657                 ret = shmem_pread_fast(page, shmem_page_offset, page_length,
 658                                        user_data, page_do_bit17_swizzling,
 659                                        needs_clflush);
 660                 if (ret == 0)
 661                         goto next_page;
 662
 663                 mutex_unlock(&dev->struct_mutex);
 664
 665                 if (likely(!i915.prefault_disable) && !prefaulted) {
 666                         ret = fault_in_multipages_writeable(user_data, remain);
 667                         /* Userspace is tricking us, but we've already clobbered
 668                          * its pages with the prefault and promised to write the
 669                          * data up to the first fault. Hence ignore any errors
 670                          * and just continue. */
 671                         (void)ret;
 672                         prefaulted = 1;
 673                 }
 674
 675                 ret = shmem_pread_slow(page, shmem_page_offset, page_length,
 676                                        user_data, page_do_bit17_swizzling,
 677                                        needs_clflush);
 678
 679                 mutex_lock(&dev->struct_mutex);
 680
 681                 if (ret)
 682                         goto out;
 683
 684 next_page:
 685                 remain -= page_length;
 686                 user_data += page_length;
 687                 offset += page_length;
 688         }
 689
 690 out:
 691         i915_gem_object_unpin_pages(obj);
 692
 693         return ret;
 694 }
 695
 696 /**
 697  * Reads data from the object referenced by handle.
 698  *
 699  * On error, the contents of *data are undefined.
 700  */
 701 int
 702 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
 703                      struct drm_file *file)
 704 {
 705         struct drm_i915_gem_pread *args = data;
 706         struct drm_i915_gem_object *obj;
 707         int ret = 0;
 708
 709         if (args->size == 0)
 710                 return 0;
 711
 712         if (!access_ok(VERIFY_WRITE,
 713                        to_user_ptr(args->data_ptr),
 714                        args->size))
 715                 return -EFAULT;
 716
 717         ret = i915_mutex_lock_interruptible(dev);
 718         if (ret)
 719                 return ret;
 720
 721         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
 722         if (&obj->base == NULL) {
 723                 ret = -ENOENT;
 724                 goto unlock;
 725         }
 726
 727         /* Bounds check source.  */
 728         if (args->offset > obj->base.size ||
 729             args->size > obj->base.size - args->offset) {
 730                 ret = -EINVAL;
 731                 goto out;
 732         }
 733
 734         /* prime objects have no backing filp to GEM pread/pwrite
 735          * pages from.
 736          */
 737         if (!obj->base.filp) {
 738                 ret = -EINVAL;
 739                 goto out;
 740         }
 741
 742         trace_i915_gem_object_pread(obj, args->offset, args->size);
 743
 744         ret = i915_gem_shmem_pread(dev, obj, args, file);
 745
 746 out:
 747         drm_gem_object_unreference(&obj->base);
 748 unlock:
 749         mutex_unlock(&dev->struct_mutex);
 750         return ret;
 751 }
 752
 753 /* This is the fast write path which cannot handle
 754  * page faults in the source data
 755  */
 756
 757 static inline int
 758 fast_user_write(struct io_mapping *mapping,
 759                 loff_t page_base, int page_offset,
 760                 char __user *user_data,
 761                 int length)
 762 {
 763         void __iomem *vaddr_atomic;
 764         void *vaddr;
 765         unsigned long unwritten;
 766
 767         vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
 768         /* We can use the cpu mem copy function because this is X86. */
 769         vaddr = (void __force*)vaddr_atomic + page_offset;
 770         unwritten = __copy_from_user_inatomic_nocache(vaddr,
 771                                                       user_data, length);
 772         io_mapping_unmap_atomic(vaddr_atomic);
 773         return unwritten;
 774 }
 775
 776 /**
 777  * This is the fast pwrite path, where we copy the data directly from the
 778  * user into the GTT, uncached.
 779  */
 780 static int
 781 i915_gem_gtt_pwrite_fast(struct drm_device *dev,
 782                          struct drm_i915_gem_object *obj,
 783                          struct drm_i915_gem_pwrite *args,
 784                          struct drm_file *file)
 785 {
 786         struct drm_i915_private *dev_priv = dev->dev_private;
 787         ssize_t remain;
 788         loff_t offset, page_base;
 789         char __user *user_data;
 790         int page_offset, page_length, ret;
 791
 792         ret = i915_gem_obj_ggtt_pin(obj, 0, PIN_MAPPABLE | PIN_NONBLOCK);
 793         if (ret)
 794                 goto out;
 795
 796         ret = i915_gem_object_set_to_gtt_domain(obj, true);
 797         if (ret)
 798                 goto out_unpin;
 799
 800         ret = i915_gem_object_put_fence(obj);
 801         if (ret)
 802                 goto out_unpin;
 803
 804         user_data = to_user_ptr(args->data_ptr);
 805         remain = args->size;
 806
 807         offset = i915_gem_obj_ggtt_offset(obj) + args->offset;
 808
 809         intel_fb_obj_invalidate(obj, NULL, ORIGIN_GTT);
 810
 811         while (remain > 0) {
 812                 /* Operation in this page
 813                  *
 814                  * page_base = page offset within aperture
 815                  * page_offset = offset within page
 816                  * page_length = bytes to copy for this page
 817                  */
 818                 page_base = offset & PAGE_MASK;
 819                 page_offset = offset_in_page(offset);
 820                 page_length = remain;
 821                 if ((page_offset + remain) > PAGE_SIZE)
 822                         page_length = PAGE_SIZE - page_offset;
 823
 824                 /* If we get a fault while copying data, then (presumably) our
 825                  * source page isn't available.  Return the error and we'll
 826                  * retry in the slow path.
 827                  */
 828                 if (fast_user_write(dev_priv->gtt.mappable, page_base,
 829                                     page_offset, user_data, page_length)) {
 830                         ret = -EFAULT;
 831                         goto out_flush;
 832                 }
 833
 834                 remain -= page_length;
 835                 user_data += page_length;
 836                 offset += page_length;
 837         }
 838
 839 out_flush:
 840         intel_fb_obj_flush(obj, false);
 841 out_unpin:
 842         i915_gem_object_ggtt_unpin(obj);
 843 out:
 844         return ret;
 845 }
 846
 847 /* Per-page copy function for the shmem pwrite fastpath.
 848  * Flushes invalid cachelines before writing to the target if
 849  * needs_clflush_before is set and flushes out any written cachelines after
 850  * writing if needs_clflush is set. */
 851 static int
 852 shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length,
 853                   char __user *user_data,
 854                   bool page_do_bit17_swizzling,
 855                   bool needs_clflush_before,
 856                   bool needs_clflush_after)
 857 {
 858         char *vaddr;
 859         int ret;
 860
 861         if (unlikely(page_do_bit17_swizzling))
 862                 return -EINVAL;
 863
 864         vaddr = kmap_atomic(page);
 865         if (needs_clflush_before)
 866                 drm_clflush_virt_range(vaddr + shmem_page_offset,
 867                                        page_length);
 868         ret = __copy_from_user_inatomic(vaddr + shmem_page_offset,
 869                                         user_data, page_length);
 870         if (needs_clflush_after)
 871                 drm_clflush_virt_range(vaddr + shmem_page_offset,
 872                                        page_length);
 873         kunmap_atomic(vaddr);
 874
 875         return ret ? -EFAULT : 0;
 876 }
 877
 878 /* Only difference to the fast-path function is that this can handle bit17
 879  * and uses non-atomic copy and kmap functions. */
 880 static int
 881 shmem_pwrite_slow(struct page *page, int shmem_page_offset, int page_length,
 882                   char __user *user_data,
 883                   bool page_do_bit17_swizzling,
 884                   bool needs_clflush_before,
 885                   bool needs_clflush_after)
 886 {
 887         char *vaddr;
 888         int ret;
 889
 890         vaddr = kmap(page);
 891         if (unlikely(needs_clflush_before || page_do_bit17_swizzling))
 892                 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
 893                                              page_length,
 894                                              page_do_bit17_swizzling);
 895         if (page_do_bit17_swizzling)
 896                 ret = __copy_from_user_swizzled(vaddr, shmem_page_offset,
 897                                                 user_data,
 898                                                 page_length);
 899         else
 900                 ret = __copy_from_user(vaddr + shmem_page_offset,
 901                                        user_data,
 902                                        page_length);
 903         if (needs_clflush_after)
 904                 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
 905                                              page_length,
 906                                              page_do_bit17_swizzling);
 907         kunmap(page);
 908
 909         return ret ? -EFAULT : 0;
 910 }
 911
 912 static int
 913 i915_gem_shmem_pwrite(struct drm_device *dev,
 914                       struct drm_i915_gem_object *obj,
 915                       struct drm_i915_gem_pwrite *args,
 916                       struct drm_file *file)
 917 {
 918         ssize_t remain;
 919         loff_t offset;
 920         char __user *user_data;
 921         int shmem_page_offset, page_length, ret = 0;
 922         int obj_do_bit17_swizzling, page_do_bit17_swizzling;
 923         int hit_slowpath = 0;
 924         int needs_clflush_after = 0;
 925         int needs_clflush_before = 0;
 926         struct sg_page_iter sg_iter;
 927
 928         user_data = to_user_ptr(args->data_ptr);
 929         remain = args->size;
 930
 931         obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
 932
 933         if (obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
 934                 /* If we're not in the cpu write domain, set ourself into the gtt
 935                  * write domain and manually flush cachelines (if required). This
 936                  * optimizes for the case when the gpu will use the data
 937                  * right away and we therefore have to clflush anyway. */
 938                 needs_clflush_after = cpu_write_needs_clflush(obj);
 939                 ret = i915_gem_object_wait_rendering(obj, false);
 940                 if (ret)
 941                         return ret;
 942
 943                 i915_gem_object_retire(obj);
 944         }
 945         /* Same trick applies to invalidate partially written cachelines read
 946          * before writing. */
 947         if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0)
 948                 needs_clflush_before =
 949                         !cpu_cache_is_coherent(dev, obj->cache_level);
 950
 951         ret = i915_gem_object_get_pages(obj);
 952         if (ret)
 953                 return ret;
 954
 955         intel_fb_obj_invalidate(obj, NULL, ORIGIN_CPU);
 956
 957         i915_gem_object_pin_pages(obj);
 958
 959         offset = args->offset;
 960         obj->dirty = 1;
 961
 962         for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents,
 963                          offset >> PAGE_SHIFT) {
 964                 struct page *page = sg_page_iter_page(&sg_iter);
 965                 int partial_cacheline_write;
 966
 967                 if (remain <= 0)
 968                         break;
 969
 970                 /* Operation in this page
 971                  *
 972                  * shmem_page_offset = offset within page in shmem file
 973                  * page_length = bytes to copy for this page
 974                  */
 975                 shmem_page_offset = offset_in_page(offset);
 976
 977                 page_length = remain;
 978                 if ((shmem_page_offset + page_length) > PAGE_SIZE)
 979                         page_length = PAGE_SIZE - shmem_page_offset;
 980
 981                 /* If we don't overwrite a cacheline completely we need to be
 982                  * careful to have up-to-date data by first clflushing. Don't
 983                  * overcomplicate things and flush the entire patch. */
 984                 partial_cacheline_write = needs_clflush_before &&
 985                         ((shmem_page_offset | page_length)
 986                                 & (boot_cpu_data.x86_clflush_size - 1));
 987
 988                 page_do_bit17_swizzling = obj_do_bit17_swizzling &&
 989                         (page_to_phys(page) & (1 << 17)) != 0;
 990
 991                 ret = shmem_pwrite_fast(page, shmem_page_offset, page_length,
 992                                         user_data, page_do_bit17_swizzling,
 993                                         partial_cacheline_write,
 994                                         needs_clflush_after);
 995                 if (ret == 0)
 996                         goto next_page;
 997
 998                 hit_slowpath = 1;
 999                 mutex_unlock(&dev->struct_mutex);
1000                 ret = shmem_pwrite_slow(page, shmem_page_offset, page_length,
1001                                         user_data, page_do_bit17_swizzling,
1002                                         partial_cacheline_write,
1003                                         needs_clflush_after);
1004
1005                 mutex_lock(&dev->struct_mutex);
1006
1007                 if (ret)
1008                         goto out;
1009
1010 next_page:
1011                 remain -= page_length;
1012                 user_data += page_length;
1013                 offset += page_length;
1014         }
1015
1016 out:
1017         i915_gem_object_unpin_pages(obj);
1018
1019         if (hit_slowpath) {
1020                 /*
1021                  * Fixup: Flush cpu caches in case we didn't flush the dirty
1022                  * cachelines in-line while writing and the object moved
1023                  * out of the cpu write domain while we've dropped the lock.
1024                  */
1025                 if (!needs_clflush_after &&
1026                     obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
1027                         if (i915_gem_clflush_object(obj, obj->pin_display))
1028                                 i915_gem_chipset_flush(dev);
1029                 }
1030         }
1031
1032         if (needs_clflush_after)
1033                 i915_gem_chipset_flush(dev);
1034
1035         intel_fb_obj_flush(obj, false);
1036         return ret;
1037 }
1038
1039 /**
1040  * Writes data to the object referenced by handle.
1041  *
1042  * On error, the contents of the buffer that were to be modified are undefined.
1043  */
1044 int
1045 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
1046                       struct drm_file *file)
1047 {
1048         struct drm_i915_private *dev_priv = dev->dev_private;
1049         struct drm_i915_gem_pwrite *args = data;
1050         struct drm_i915_gem_object *obj;
1051         int ret;
1052
1053         if (args->size == 0)
1054                 return 0;
1055
1056         if (!access_ok(VERIFY_READ,
1057                        to_user_ptr(args->data_ptr),
1058                        args->size))
1059                 return -EFAULT;
1060
1061         if (likely(!i915.prefault_disable)) {
1062                 ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
1063                                                    args->size);
1064                 if (ret)
1065                         return -EFAULT;
1066         }
1067
1068         intel_runtime_pm_get(dev_priv);
1069
1070         ret = i915_mutex_lock_interruptible(dev);
1071         if (ret)
1072                 goto put_rpm;
1073
1074         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1075         if (&obj->base == NULL) {
1076                 ret = -ENOENT;
1077                 goto unlock;
1078         }
1079
1080         /* Bounds check destination. */
1081         if (args->offset > obj->base.size ||
1082             args->size > obj->base.size - args->offset) {
1083                 ret = -EINVAL;
1084                 goto out;
1085         }
1086
1087         /* prime objects have no backing filp to GEM pread/pwrite
1088          * pages from.
1089          */
1090         if (!obj->base.filp) {
1091                 ret = -EINVAL;
1092                 goto out;
1093         }
1094
1095         trace_i915_gem_object_pwrite(obj, args->offset, args->size);
1096
1097         ret = -EFAULT;
1098         /* We can only do the GTT pwrite on untiled buffers, as otherwise
1099          * it would end up going through the fenced access, and we'll get
1100          * different detiling behavior between reading and writing.
1101          * pread/pwrite currently are reading and writing from the CPU
1102          * perspective, requiring manual detiling by the client.
1103          */
1104         if (obj->tiling_mode == I915_TILING_NONE &&
1105             obj->base.write_domain != I915_GEM_DOMAIN_CPU &&
1106             cpu_write_needs_clflush(obj)) {
1107                 ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file);
1108                 /* Note that the gtt paths might fail with non-page-backed user
1109                  * pointers (e.g. gtt mappings when moving data between
1110                  * textures). Fallback to the shmem path in that case. */
1111         }
1112
1113         if (ret == -EFAULT || ret == -ENOSPC) {
1114                 if (obj->phys_handle)
1115                         ret = i915_gem_phys_pwrite(obj, args, file);
1116                 else
1117                         ret = i915_gem_shmem_pwrite(dev, obj, args, file);
1118         }
1119
1120 out:
1121         drm_gem_object_unreference(&obj->base);
1122 unlock:
1123         mutex_unlock(&dev->struct_mutex);
1124 put_rpm:
1125         intel_runtime_pm_put(dev_priv);
1126
1127         return ret;
1128 }
1129
1130 int
1131 i915_gem_check_wedge(struct i915_gpu_error *error,
1132                      bool interruptible)
1133 {
1134         if (i915_reset_in_progress(error)) {
1135                 /* Non-interruptible callers can't handle -EAGAIN, hence return
1136                  * -EIO unconditionally for these. */
1137                 if (!interruptible)
1138                         return -EIO;
1139
1140                 /* Recovery complete, but the reset failed ... */
1141                 if (i915_terminally_wedged(error))
1142                         return -EIO;
1143
1144                 /*
1145                  * Check if GPU Reset is in progress - we need intel_ring_begin
1146                  * to work properly to reinit the hw state while the gpu is
1147                  * still marked as reset-in-progress. Handle this with a flag.
1148                  */
1149                 if (!error->reload_in_reset)
1150                         return -EAGAIN;
1151         }
1152
1153         return 0;
1154 }
1155
1156 /*
1157  * Compare arbitrary request against outstanding lazy request. Emit on match.
1158  */
1159 int
1160 i915_gem_check_olr(struct drm_i915_gem_request *req)
1161 {
1162         int ret;
1163
1164         WARN_ON(!mutex_is_locked(&req->ring->dev->struct_mutex));
1165
1166         ret = 0;
1167         if (req == req->ring->outstanding_lazy_request)
1168                 ret = i915_add_request(req->ring);
1169
1170         return ret;
1171 }
1172
1173 static void fake_irq(unsigned long data)
1174 {
1175         wake_up_process((struct task_struct *)data);
1176 }
1177
1178 static bool missed_irq(struct drm_i915_private *dev_priv,
1179                        struct intel_engine_cs *ring)
1180 {
1181         return test_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings);
1182 }
1183
1184 static bool can_wait_boost(struct drm_i915_file_private *file_priv)
1185 {
1186         if (file_priv == NULL)
1187                 return true;
1188
1189         return !atomic_xchg(&file_priv->rps_wait_boost, true);
1190 }
1191
1192 /**
1193  * __i915_wait_request - wait until execution of request has finished
1194  * @req: duh!
1195  * @reset_counter: reset sequence associated with the given request
1196  * @interruptible: do an interruptible wait (normally yes)
1197  * @timeout: in - how long to wait (NULL forever); out - how much time remaining
1198  *
1199  * Note: It is of utmost importance that the passed in seqno and reset_counter
1200  * values have been read by the caller in an smp safe manner. Where read-side
1201  * locks are involved, it is sufficient to read the reset_counter before
1202  * unlocking the lock that protects the seqno. For lockless tricks, the
1203  * reset_counter _must_ be read before, and an appropriate smp_rmb must be
1204  * inserted.
1205  *
1206  * Returns 0 if the request was found within the alloted time. Else returns the
1207  * errno with remaining time filled in timeout argument.
1208  */
1209 int __i915_wait_request(struct drm_i915_gem_request *req,
1210                         unsigned reset_counter,
1211                         bool interruptible,
1212                         s64 *timeout,
1213                         struct drm_i915_file_private *file_priv)
1214 {
1215         struct intel_engine_cs *ring = i915_gem_request_get_ring(req);
1216         struct drm_device *dev = ring->dev;
1217         struct drm_i915_private *dev_priv = dev->dev_private;
1218         const bool irq_test_in_progress =
1219                 ACCESS_ONCE(dev_priv->gpu_error.test_irq_rings) & intel_ring_flag(ring);
1220         DEFINE_WAIT(wait);
1221         unsigned long timeout_expire;
1222         s64 before, now;
1223         int ret;
1224
1225         WARN(!intel_irqs_enabled(dev_priv), "IRQs disabled");
1226
1227         if (i915_gem_request_completed(req, true))
1228                 return 0;
1229
1230         timeout_expire = timeout ?
1231                 jiffies + nsecs_to_jiffies_timeout((u64)*timeout) : 0;
1232
1233         if (INTEL_INFO(dev)->gen >= 6 && ring->id == RCS && can_wait_boost(file_priv)) {
1234                 gen6_rps_boost(dev_priv);
1235                 if (file_priv)
1236                         mod_delayed_work(dev_priv->wq,
1237                                          &file_priv->mm.idle_work,
1238                                          msecs_to_jiffies(100));
1239         }
1240
1241         if (!irq_test_in_progress && WARN_ON(!ring->irq_get(ring)))
1242                 return -ENODEV;
1243
1244         /* Record current time in case interrupted by signal, or wedged */
1245         trace_i915_gem_request_wait_begin(req);
1246         before = ktime_get_raw_ns();
1247         for (;;) {
1248                 struct timer_list timer;
1249
1250                 prepare_to_wait(&ring->irq_queue, &wait,
1251                                 interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
1252
1253                 /* We need to check whether any gpu reset happened in between
1254                  * the caller grabbing the seqno and now ... */
1255                 if (reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter)) {
1256                         /* ... but upgrade the -EAGAIN to an -EIO if the gpu
1257                          * is truely gone. */
1258                         ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
1259                         if (ret == 0)
1260                                 ret = -EAGAIN;
1261                         break;
1262                 }
1263
1264                 if (i915_gem_request_completed(req, false)) {
1265                         ret = 0;
1266                         break;
1267                 }
1268
1269                 if (interruptible && signal_pending(current)) {
1270                         ret = -ERESTARTSYS;
1271                         break;
1272                 }
1273
1274                 if (timeout && time_after_eq(jiffies, timeout_expire)) {
1275                         ret = -ETIME;
1276                         break;
1277                 }
1278
1279                 timer.function = NULL;
1280                 if (timeout || missed_irq(dev_priv, ring)) {
1281                         unsigned long expire;
1282
1283                         setup_timer_on_stack(&timer, fake_irq, (unsigned long)current);
1284                         expire = missed_irq(dev_priv, ring) ? jiffies + 1 : timeout_expire;
1285                         mod_timer(&timer, expire);
1286                 }
1287
1288                 io_schedule();
1289
1290                 if (timer.function) {
1291                         del_singleshot_timer_sync(&timer);
1292                         destroy_timer_on_stack(&timer);
1293                 }
1294         }
1295         now = ktime_get_raw_ns();
1296         trace_i915_gem_request_wait_end(req);
1297
1298         if (!irq_test_in_progress)
1299                 ring->irq_put(ring);
1300
1301         finish_wait(&ring->irq_queue, &wait);
1302
1303         if (timeout) {
1304                 s64 tres = *timeout - (now - before);
1305
1306                 *timeout = tres < 0 ? 0 : tres;
1307
1308                 /*
1309                  * Apparently ktime isn't accurate enough and occasionally has a
1310                  * bit of mismatch in the jiffies<->nsecs<->ktime loop. So patch
1311                  * things up to make the test happy. We allow up to 1 jiffy.
1312                  *
1313                  * This is a regrssion from the timespec->ktime conversion.
1314                  */
1315                 if (ret == -ETIME && *timeout < jiffies_to_usecs(1)*1000)
1316                         *timeout = 0;
1317         }
1318
1319         return ret;
1320 }
1321
1322 /**
1323  * Waits for a request to be signaled, and cleans up the
1324  * request and object lists appropriately for that event.
1325  */
1326 int
1327 i915_wait_request(struct drm_i915_gem_request *req)
1328 {
1329         struct drm_device *dev;
1330         struct drm_i915_private *dev_priv;
1331         bool interruptible;
1332         unsigned reset_counter;
1333         int ret;
1334
1335         BUG_ON(req == NULL);
1336
1337         dev = req->ring->dev;
1338         dev_priv = dev->dev_private;
1339         interruptible = dev_priv->mm.interruptible;
1340
1341         BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1342
1343         ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
1344         if (ret)
1345                 return ret;
1346
1347         ret = i915_gem_check_olr(req);
1348         if (ret)
1349                 return ret;
1350
1351         reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
1352         i915_gem_request_reference(req);
1353         ret = __i915_wait_request(req, reset_counter,
1354                                   interruptible, NULL, NULL);
1355         i915_gem_request_unreference(req);
1356         return ret;
1357 }
1358
1359 static int
1360 i915_gem_object_wait_rendering__tail(struct drm_i915_gem_object *obj)
1361 {
1362         if (!obj->active)
1363                 return 0;
1364
1365         /* Manually manage the write flush as we may have not yet
1366          * retired the buffer.
1367          *
1368          * Note that the last_write_req is always the earlier of
1369          * the two (read/write) requests, so if we haved successfully waited,
1370          * we know we have passed the last write.
1371          */
1372         i915_gem_request_assign(&obj->last_write_req, NULL);
1373
1374         return 0;
1375 }
1376
1377 /**
1378  * Ensures that all rendering to the object has completed and the object is
1379  * safe to unbind from the GTT or access from the CPU.
1380  */
1381 static __must_check int
1382 i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
1383                                bool readonly)
1384 {
1385         struct drm_i915_gem_request *req;
1386         int ret;
1387
1388         req = readonly ? obj->last_write_req : obj->last_read_req;
1389         if (!req)
1390                 return 0;
1391
1392         ret = i915_wait_request(req);
1393         if (ret)
1394                 return ret;
1395
1396         return i915_gem_object_wait_rendering__tail(obj);
1397 }
1398
1399 /* A nonblocking variant of the above wait. This is a highly dangerous routine
1400  * as the object state may change during this call.
1401  */
1402 static __must_check int
1403 i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
1404                                             struct drm_i915_file_private *file_priv,
1405                                             bool readonly)
1406 {
1407         struct drm_i915_gem_request *req;
1408         struct drm_device *dev = obj->base.dev;
1409         struct drm_i915_private *dev_priv = dev->dev_private;
1410         unsigned reset_counter;
1411         int ret;
1412
1413         BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1414         BUG_ON(!dev_priv->mm.interruptible);
1415
1416         req = readonly ? obj->last_write_req : obj->last_read_req;
1417         if (!req)
1418                 return 0;
1419
1420         ret = i915_gem_check_wedge(&dev_priv->gpu_error, true);
1421         if (ret)
1422                 return ret;
1423
1424         ret = i915_gem_check_olr(req);
1425         if (ret)
1426                 return ret;
1427
1428         reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
1429         i915_gem_request_reference(req);
1430         mutex_unlock(&dev->struct_mutex);
1431         ret = __i915_wait_request(req, reset_counter, true, NULL, file_priv);
1432         mutex_lock(&dev->struct_mutex);
1433         i915_gem_request_unreference(req);
1434         if (ret)
1435                 return ret;
1436
1437         return i915_gem_object_wait_rendering__tail(obj);
1438 }
1439
1440 /**
1441  * Called when user space prepares to use an object with the CPU, either
1442  * through the mmap ioctl's mapping or a GTT mapping.
1443  */
1444 int
1445 i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
1446                           struct drm_file *file)
1447 {
1448         struct drm_i915_gem_set_domain *args = data;
1449         struct drm_i915_gem_object *obj;
1450         uint32_t read_domains = args->read_domains;
1451         uint32_t write_domain = args->write_domain;
1452         int ret;
1453
1454         /* Only handle setting domains to types used by the CPU. */
1455         if (write_domain & I915_GEM_GPU_DOMAINS)
1456                 return -EINVAL;
1457
1458         if (read_domains & I915_GEM_GPU_DOMAINS)
1459                 return -EINVAL;
1460
1461         /* Having something in the write domain implies it's in the read
1462          * domain, and only that read domain.  Enforce that in the request.
1463          */
1464         if (write_domain != 0 && read_domains != write_domain)
1465                 return -EINVAL;
1466
1467         ret = i915_mutex_lock_interruptible(dev);
1468         if (ret)
1469                 return ret;
1470
1471         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1472         if (&obj->base == NULL) {
1473                 ret = -ENOENT;
1474                 goto unlock;
1475         }
1476
1477         /* Try to flush the object off the GPU without holding the lock.
1478          * We will repeat the flush holding the lock in the normal manner
1479          * to catch cases where we are gazumped.
1480          */
1481         ret = i915_gem_object_wait_rendering__nonblocking(obj,
1482                                                           file->driver_priv,
1483                                                           !write_domain);
1484         if (ret)
1485                 goto unref;
1486
1487         if (read_domains & I915_GEM_DOMAIN_GTT)
1488                 ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0);
1489         else
1490                 ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0);
1491
1492 unref:
1493         drm_gem_object_unreference(&obj->base);
1494 unlock:
1495         mutex_unlock(&dev->struct_mutex);
1496         return ret;
1497 }
1498
1499 /**
1500  * Called when user space has done writes to this buffer
1501  */
1502 int
1503 i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
1504                          struct drm_file *file)
1505 {
1506         struct drm_i915_gem_sw_finish *args = data;
1507         struct drm_i915_gem_object *obj;
1508         int ret = 0;
1509
1510         ret = i915_mutex_lock_interruptible(dev);
1511         if (ret)
1512                 return ret;
1513
1514         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1515         if (&obj->base == NULL) {
1516                 ret = -ENOENT;
1517                 goto unlock;
1518         }
1519
1520         /* Pinned buffers may be scanout, so flush the cache */
1521         if (obj->pin_display)
1522                 i915_gem_object_flush_cpu_write_domain(obj);
1523
1524         drm_gem_object_unreference(&obj->base);
1525 unlock:
1526         mutex_unlock(&dev->struct_mutex);
1527         return ret;
1528 }
1529
1530 /**
1531  * Maps the contents of an object, returning the address it is mapped
1532  * into.
1533  *
1534  * While the mapping holds a reference on the contents of the object, it doesn't
1535  * imply a ref on the object itself.
1536  *
1537  * IMPORTANT:
1538  *
1539  * DRM driver writers who look a this function as an example for how to do GEM
1540  * mmap support, please don't implement mmap support like here. The modern way
1541  * to implement DRM mmap support is with an mmap offset ioctl (like
1542  * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly.
1543  * That way debug tooling like valgrind will understand what's going on, hiding
1544  * the mmap call in a driver private ioctl will break that. The i915 driver only
1545  * does cpu mmaps this way because we didn't know better.
1546  */
1547 int
1548 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
1549                     struct drm_file *file)
1550 {
1551         struct drm_i915_gem_mmap *args = data;
1552         struct drm_gem_object *obj;
1553         unsigned long addr;
1554
1555         if (args->flags & ~(I915_MMAP_WC))
1556                 return -EINVAL;
1557
1558         if (args->flags & I915_MMAP_WC && !cpu_has_pat)
1559                 return -ENODEV;
1560
1561         obj = drm_gem_object_lookup(dev, file, args->handle);
1562         if (obj == NULL)
1563                 return -ENOENT;
1564
1565         /* prime objects have no backing filp to GEM mmap
1566          * pages from.
1567          */
1568         if (!obj->filp) {
1569                 drm_gem_object_unreference_unlocked(obj);
1570                 return -EINVAL;
1571         }
1572
1573         addr = vm_mmap(obj->filp, 0, args->size,
1574                        PROT_READ | PROT_WRITE, MAP_SHARED,
1575                        args->offset);
1576         if (args->flags & I915_MMAP_WC) {
1577                 struct mm_struct *mm = current->mm;
1578                 struct vm_area_struct *vma;
1579
1580                 down_write(&mm->mmap_sem);
1581                 vma = find_vma(mm, addr);
1582                 if (vma)
1583                         vma->vm_page_prot =
1584                                 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
1585                 else
1586                         addr = -ENOMEM;
1587                 up_write(&mm->mmap_sem);
1588         }
1589         drm_gem_object_unreference_unlocked(obj);
1590         if (IS_ERR((void *)addr))
1591                 return addr;
1592
1593         args->addr_ptr = (uint64_t) addr;
1594
1595         return 0;
1596 }
1597
1598 /**
1599  * i915_gem_fault - fault a page into the GTT
1600  * vma: VMA in question
1601  * vmf: fault info
1602  *
1603  * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
1604  * from userspace.  The fault handler takes care of binding the object to
1605  * the GTT (if needed), allocating and programming a fence register (again,
1606  * only if needed based on whether the old reg is still valid or the object
1607  * is tiled) and inserting a new PTE into the faulting process.
1608  *
1609  * Note that the faulting process may involve evicting existing objects
1610  * from the GTT and/or fence registers to make room.  So performance may
1611  * suffer if the GTT working set is large or there are few fence registers
1612  * left.
1613  */
1614 int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1615 {
1616         struct drm_i915_gem_object *obj = to_intel_bo(vma->vm_private_data);
1617         struct drm_device *dev = obj->base.dev;
1618         struct drm_i915_private *dev_priv = dev->dev_private;
1619         pgoff_t page_offset;
1620         unsigned long pfn;
1621         int ret = 0;
1622         bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
1623
1624         intel_runtime_pm_get(dev_priv);
1625
1626         /* We don't use vmf->pgoff since that has the fake offset */
1627         page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
1628                 PAGE_SHIFT;
1629
1630         ret = i915_mutex_lock_interruptible(dev);
1631         if (ret)
1632                 goto out;
1633
1634         trace_i915_gem_object_fault(obj, page_offset, true, write);
1635
1636         /* Try to flush the object off the GPU first without holding the lock.
1637          * Upon reacquiring the lock, we will perform our sanity checks and then
1638          * repeat the flush holding the lock in the normal manner to catch cases
1639          * where we are gazumped.
1640          */
1641         ret = i915_gem_object_wait_rendering__nonblocking(obj, NULL, !write);
1642         if (ret)
1643                 goto unlock;
1644
1645         /* Access to snoopable pages through the GTT is incoherent. */
1646         if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev)) {
1647                 ret = -EFAULT;
1648                 goto unlock;
1649         }
1650
1651         /* Now bind it into the GTT if needed */
1652         ret = i915_gem_obj_ggtt_pin(obj, 0, PIN_MAPPABLE);
1653         if (ret)
1654                 goto unlock;
1655
1656         ret = i915_gem_object_set_to_gtt_domain(obj, write);
1657         if (ret)
1658                 goto unpin;
1659
1660         ret = i915_gem_object_get_fence(obj);
1661         if (ret)
1662                 goto unpin;
1663
1664         /* Finally, remap it using the new GTT offset */
1665         pfn = dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj);
1666         pfn >>= PAGE_SHIFT;
1667
1668         if (!obj->fault_mappable) {
1669                 unsigned long size = min_t(unsigned long,
1670                                            vma->vm_end - vma->vm_start,
1671                                            obj->base.size);
1672                 int i;
1673
1674                 for (i = 0; i < size >> PAGE_SHIFT; i++) {
1675                         ret = vm_insert_pfn(vma,
1676                                             (unsigned long)vma->vm_start + i * PAGE_SIZE,
1677                                             pfn + i);
1678                         if (ret)
1679                                 break;
1680                 }
1681
1682                 obj->fault_mappable = true;
1683         } else
1684                 ret = vm_insert_pfn(vma,
1685                                     (unsigned long)vmf->virtual_address,
1686                                     pfn + page_offset);
1687 unpin:
1688         i915_gem_object_ggtt_unpin(obj);
1689 unlock:
1690         mutex_unlock(&dev->struct_mutex);
1691 out:
1692         switch (ret) {
1693         case -EIO:
1694                 /*
1695                  * We eat errors when the gpu is terminally wedged to avoid
1696                  * userspace unduly crashing (gl has no provisions for mmaps to
1697                  * fail). But any other -EIO isn't ours (e.g. swap in failure)
1698                  * and so needs to be reported.
1699                  */
1700                 if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
1701                         ret = VM_FAULT_SIGBUS;
1702                         break;
1703                 }
1704         case -EAGAIN:
1705                 /*
1706                  * EAGAIN means the gpu is hung and we'll wait for the error
1707                  * handler to reset everything when re-faulting in
1708                  * i915_mutex_lock_interruptible.
1709                  */
1710         case 0:
1711         case -ERESTARTSYS:
1712         case -EINTR:
1713         case -EBUSY:
1714                 /*
1715                  * EBUSY is ok: this just means that another thread
1716                  * already did the job.
1717                  */
1718                 ret = VM_FAULT_NOPAGE;
1719                 break;
1720         case -ENOMEM:
1721                 ret = VM_FAULT_OOM;
1722                 break;
1723         case -ENOSPC:
1724         case -EFAULT:
1725                 ret = VM_FAULT_SIGBUS;
1726                 break;
1727         default:
1728                 WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret);
1729                 ret = VM_FAULT_SIGBUS;
1730                 break;
1731         }
1732
1733         intel_runtime_pm_put(dev_priv);
1734         return ret;
1735 }
1736
1737 /**
1738  * i915_gem_release_mmap - remove physical page mappings
1739  * @obj: obj in question
1740  *
1741  * Preserve the reservation of the mmapping with the DRM core code, but
1742  * relinquish ownership of the pages back to the system.
1743  *
1744  * It is vital that we remove the page mapping if we have mapped a tiled
1745  * object through the GTT and then lose the fence register due to
1746  * resource pressure. Similarly if the object has been moved out of the
1747  * aperture, than pages mapped into userspace must be revoked. Removing the
1748  * mapping will then trigger a page fault on the next user access, allowing
1749  * fixup by i915_gem_fault().
1750  */
1751 void
1752 i915_gem_release_mmap(struct drm_i915_gem_object *obj)
1753 {
1754         if (!obj->fault_mappable)
1755                 return;
1756
1757         drm_vma_node_unmap(&obj->base.vma_node,
1758                            obj->base.dev->anon_inode->i_mapping);
1759         obj->fault_mappable = false;
1760 }
1761
1762 void
1763 i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv)
1764 {
1765         struct drm_i915_gem_object *obj;
1766
1767         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)
1768                 i915_gem_release_mmap(obj);
1769 }
1770
1771 uint32_t
1772 i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode)
1773 {
1774         uint32_t gtt_size;
1775
1776         if (INTEL_INFO(dev)->gen >= 4 ||
1777             tiling_mode == I915_TILING_NONE)
1778                 return size;
1779
1780         /* Previous chips need a power-of-two fence region when tiling */
1781         if (INTEL_INFO(dev)->gen == 3)
1782                 gtt_size = 1024*1024;
1783         else
1784                 gtt_size = 512*1024;
1785
1786         while (gtt_size < size)
1787                 gtt_size <<= 1;
1788
1789         return gtt_size;
1790 }
1791
1792 /**
1793  * i915_gem_get_gtt_alignment - return required GTT alignment for an object
1794  * @obj: object to check
1795  *
1796  * Return the required GTT alignment for an object, taking into account
1797  * potential fence register mapping.
1798  */
1799 uint32_t
1800 i915_gem_get_gtt_alignment(struct drm_device *dev, uint32_t size,
1801                            int tiling_mode, bool fenced)
1802 {
1803         /*
1804          * Minimum alignment is 4k (GTT page size), but might be greater
1805          * if a fence register is needed for the object.
1806          */
1807         if (INTEL_INFO(dev)->gen >= 4 || (!fenced && IS_G33(dev)) ||
1808             tiling_mode == I915_TILING_NONE)
1809                 return 4096;
1810
1811         /*
1812          * Previous chips need to be aligned to the size of the smallest
1813          * fence register that can contain the object.
1814          */
1815         return i915_gem_get_gtt_size(dev, size, tiling_mode);
1816 }
1817
1818 static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
1819 {
1820         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
1821         int ret;
1822
1823         if (drm_vma_node_has_offset(&obj->base.vma_node))
1824                 return 0;
1825
1826         dev_priv->mm.shrinker_no_lock_stealing = true;
1827
1828         ret = drm_gem_create_mmap_offset(&obj->base);
1829         if (ret != -ENOSPC)
1830                 goto out;
1831
1832         /* Badly fragmented mmap space? The only way we can recover
1833          * space is by destroying unwanted objects. We can't randomly release
1834          * mmap_offsets as userspace expects them to be persistent for the
1835          * lifetime of the objects. The closest we can is to release the
1836          * offsets on purgeable objects by truncating it and marking it purged,
1837          * which prevents userspace from ever using that object again.
1838          */
1839         i915_gem_shrink(dev_priv,
1840                         obj->base.size >> PAGE_SHIFT,
1841                         I915_SHRINK_BOUND |
1842                         I915_SHRINK_UNBOUND |
1843                         I915_SHRINK_PURGEABLE);
1844         ret = drm_gem_create_mmap_offset(&obj->base);
1845         if (ret != -ENOSPC)
1846                 goto out;
1847
1848         i915_gem_shrink_all(dev_priv);
1849         ret = drm_gem_create_mmap_offset(&obj->base);
1850 out:
1851         dev_priv->mm.shrinker_no_lock_stealing = false;
1852
1853         return ret;
1854 }
1855
1856 static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj)
1857 {
1858         drm_gem_free_mmap_offset(&obj->base);
1859 }
1860
1861 int
1862 i915_gem_mmap_gtt(struct drm_file *file,
1863                   struct drm_device *dev,
1864                   uint32_t handle,
1865                   uint64_t *offset)
1866 {
1867         struct drm_i915_private *dev_priv = dev->dev_private;
1868         struct drm_i915_gem_object *obj;
1869         int ret;
1870
1871         ret = i915_mutex_lock_interruptible(dev);
1872         if (ret)
1873                 return ret;
1874
1875         obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
1876         if (&obj->base == NULL) {
1877                 ret = -ENOENT;
1878                 goto unlock;
1879         }
1880
1881         if (obj->base.size > dev_priv->gtt.mappable_end) {
1882                 ret = -E2BIG;
1883                 goto out;
1884         }
1885
1886         if (obj->madv != I915_MADV_WILLNEED) {
1887                 DRM_DEBUG("Attempting to mmap a purgeable buffer\n");
1888                 ret = -EFAULT;
1889                 goto out;
1890         }
1891
1892         ret = i915_gem_object_create_mmap_offset(obj);
1893         if (ret)
1894                 goto out;
1895
1896         *offset = drm_vma_node_offset_addr(&obj->base.vma_node);
1897
1898 out:
1899         drm_gem_object_unreference(&obj->base);
1900 unlock:
1901         mutex_unlock(&dev->struct_mutex);
1902         return ret;
1903 }
1904
1905 /**
1906  * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
1907  * @dev: DRM device
1908  * @data: GTT mapping ioctl data
1909  * @file: GEM object info
1910  *
1911  * Simply returns the fake offset to userspace so it can mmap it.
1912  * The mmap call will end up in drm_gem_mmap(), which will set things
1913  * up so we can get faults in the handler above.
1914  *
1915  * The fault handler will take care of binding the object into the GTT
1916  * (since it may have been evicted to make room for something), allocating
1917  * a fence register, and mapping the appropriate aperture address into
1918  * userspace.
1919  */
1920 int
1921 i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
1922                         struct drm_file *file)
1923 {
1924         struct drm_i915_gem_mmap_gtt *args = data;
1925
1926         return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
1927 }
1928
1929 /* Immediately discard the backing storage */
1930 static void
1931 i915_gem_object_truncate(struct drm_i915_gem_object *obj)
1932 {
1933         i915_gem_object_free_mmap_offset(obj);
1934
1935         if (obj->base.filp == NULL)
1936                 return;
1937
1938         /* Our goal here is to return as much of the memory as
1939          * is possible back to the system as we are called from OOM.
1940          * To do this we must instruct the shmfs to drop all of its
1941          * backing pages, *now*.
1942          */
1943         shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1);
1944         obj->madv = __I915_MADV_PURGED;
1945 }
1946
1947 /* Try to discard unwanted pages */
1948 static void
1949 i915_gem_object_invalidate(struct drm_i915_gem_object *obj)
1950 {
1951         struct address_space *mapping;
1952
1953         switch (obj->madv) {
1954         case I915_MADV_DONTNEED:
1955                 i915_gem_object_truncate(obj);
1956         case __I915_MADV_PURGED:
1957                 return;
1958         }
1959
1960         if (obj->base.filp == NULL)
1961                 return;
1962
1963         mapping = file_inode(obj->base.filp)->i_mapping,
1964         invalidate_mapping_pages(mapping, 0, (loff_t)-1);
1965 }
1966
1967 static void
1968 i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj)
1969 {
1970         struct sg_page_iter sg_iter;
1971         int ret;
1972
1973         BUG_ON(obj->madv == __I915_MADV_PURGED);
1974
1975         ret = i915_gem_object_set_to_cpu_domain(obj, true);
1976         if (ret) {
1977                 /* In the event of a disaster, abandon all caches and
1978                  * hope for the best.
1979                  */
1980                 WARN_ON(ret != -EIO);
1981                 i915_gem_clflush_object(obj, true);
1982                 obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU;
1983         }
1984
1985         if (i915_gem_object_needs_bit17_swizzle(obj))
1986                 i915_gem_object_save_bit_17_swizzle(obj);
1987
1988         if (obj->madv == I915_MADV_DONTNEED)
1989                 obj->dirty = 0;
1990
1991         for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) {
1992                 struct page *page = sg_page_iter_page(&sg_iter);
1993
1994                 if (obj->dirty)
1995                         set_page_dirty(page);
1996
1997                 if (obj->madv == I915_MADV_WILLNEED)
1998                         mark_page_accessed(page);
1999
2000                 page_cache_release(page);
2001         }
2002         obj->dirty = 0;
2003
2004         sg_free_table(obj->pages);
2005         kfree(obj->pages);
2006 }
2007
2008 int
2009 i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
2010 {
2011         const struct drm_i915_gem_object_ops *ops = obj->ops;
2012
2013         if (obj->pages == NULL)
2014                 return 0;
2015
2016         if (obj->pages_pin_count)
2017                 return -EBUSY;
2018
2019         BUG_ON(i915_gem_obj_bound_any(obj));
2020
2021         /* ->put_pages might need to allocate memory for the bit17 swizzle
2022          * array, hence protect them from being reaped by removing them from gtt
2023          * lists early. */
2024         list_del(&obj->global_list);
2025
2026         ops->put_pages(obj);
2027         obj->pages = NULL;
2028
2029         i915_gem_object_invalidate(obj);
2030
2031         return 0;
2032 }
2033
2034 static int
2035 i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
2036 {
2037         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2038         int page_count, i;
2039         struct address_space *mapping;
2040         struct sg_table *st;
2041         struct scatterlist *sg;
2042         struct sg_page_iter sg_iter;
2043         struct page *page;
2044         unsigned long last_pfn = 0;     /* suppress gcc warning */
2045         gfp_t gfp;
2046
2047         /* Assert that the object is not currently in any GPU domain. As it
2048          * wasn't in the GTT, there shouldn't be any way it could have been in
2049          * a GPU cache
2050          */
2051         BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
2052         BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
2053
2054         st = kmalloc(sizeof(*st), GFP_KERNEL);
2055         if (st == NULL)
2056                 return -ENOMEM;
2057
2058         page_count = obj->base.size / PAGE_SIZE;
2059         if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
2060                 kfree(st);
2061                 return -ENOMEM;
2062         }
2063
2064         /* Get the list of pages out of our struct file.  They'll be pinned
2065          * at this point until we release them.
2066          *
2067          * Fail silently without starting the shrinker
2068          */
2069         mapping = file_inode(obj->base.filp)->i_mapping;
2070         gfp = mapping_gfp_mask(mapping);
2071         gfp |= __GFP_NORETRY | __GFP_NOWARN | __GFP_NO_KSWAPD;
2072         gfp &= ~(__GFP_IO | __GFP_WAIT);
2073         sg = st->sgl;
2074         st->nents = 0;
2075         for (i = 0; i < page_count; i++) {
2076                 page = shmem_read_mapping_page_gfp(mapping, i, gfp);
2077                 if (IS_ERR(page)) {
2078                         i915_gem_shrink(dev_priv,
2079                                         page_count,
2080                                         I915_SHRINK_BOUND |
2081                                         I915_SHRINK_UNBOUND |
2082                                         I915_SHRINK_PURGEABLE);
2083                         page = shmem_read_mapping_page_gfp(mapping, i, gfp);
2084                 }
2085                 if (IS_ERR(page)) {
2086                         /* We've tried hard to allocate the memory by reaping
2087                          * our own buffer, now let the real VM do its job and
2088                          * go down in flames if truly OOM.
2089                          */
2090                         i915_gem_shrink_all(dev_priv);
2091                         page = shmem_read_mapping_page(mapping, i);
2092                         if (IS_ERR(page))
2093                                 goto err_pages;
2094                 }
2095 #ifdef CONFIG_SWIOTLB
2096                 if (swiotlb_nr_tbl()) {
2097                         st->nents++;
2098                         sg_set_page(sg, page, PAGE_SIZE, 0);
2099                         sg = sg_next(sg);
2100                         continue;
2101                 }
2102 #endif
2103                 if (!i || page_to_pfn(page) != last_pfn + 1) {
2104                         if (i)
2105                                 sg = sg_next(sg);
2106                         st->nents++;
2107                         sg_set_page(sg, page, PAGE_SIZE, 0);
2108                 } else {
2109                         sg->length += PAGE_SIZE;
2110                 }
2111                 last_pfn = page_to_pfn(page);
2112
2113                 /* Check that the i965g/gm workaround works. */
2114                 WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL));
2115         }
2116 #ifdef CONFIG_SWIOTLB
2117         if (!swiotlb_nr_tbl())
2118 #endif
2119                 sg_mark_end(sg);
2120         obj->pages = st;
2121
2122         if (i915_gem_object_needs_bit17_swizzle(obj))
2123                 i915_gem_object_do_bit_17_swizzle(obj);
2124
2125         if (obj->tiling_mode != I915_TILING_NONE &&
2126             dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES)
2127                 i915_gem_object_pin_pages(obj);
2128
2129         return 0;
2130
2131 err_pages:
2132         sg_mark_end(sg);
2133         for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
2134                 page_cache_release(sg_page_iter_page(&sg_iter));
2135         sg_free_table(st);
2136         kfree(st);
2137
2138         /* shmemfs first checks if there is enough memory to allocate the page
2139          * and reports ENOSPC should there be insufficient, along with the usual
2140          * ENOMEM for a genuine allocation failure.
2141          *
2142          * We use ENOSPC in our driver to mean that we have run out of aperture
2143          * space and so want to translate the error from shmemfs back to our
2144          * usual understanding of ENOMEM.
2145          */
2146         if (PTR_ERR(page) == -ENOSPC)
2147                 return -ENOMEM;
2148         else
2149                 return PTR_ERR(page);
2150 }
2151
2152 /* Ensure that the associated pages are gathered from the backing storage
2153  * and pinned into our object. i915_gem_object_get_pages() may be called
2154  * multiple times before they are released by a single call to
2155  * i915_gem_object_put_pages() - once the pages are no longer referenced
2156  * either as a result of memory pressure (reaping pages under the shrinker)
2157  * or as the object is itself released.
2158  */
2159 int
2160 i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
2161 {
2162         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2163         const struct drm_i915_gem_object_ops *ops = obj->ops;
2164         int ret;
2165
2166         if (obj->pages)
2167                 return 0;
2168
2169         if (obj->madv != I915_MADV_WILLNEED) {
2170                 DRM_DEBUG("Attempting to obtain a purgeable object\n");
2171                 return -EFAULT;
2172         }
2173
2174         BUG_ON(obj->pages_pin_count);
2175
2176         ret = ops->get_pages(obj);
2177         if (ret)
2178                 return ret;
2179
2180         list_add_tail(&obj->global_list, &dev_priv->mm.unbound_list);
2181         return 0;
2182 }
2183
2184 static void
2185 i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
2186                                struct intel_engine_cs *ring)
2187 {
2188         struct drm_i915_gem_request *req;
2189         struct intel_engine_cs *old_ring;
2190
2191         BUG_ON(ring == NULL);
2192
2193         req = intel_ring_get_request(ring);
2194         old_ring = i915_gem_request_get_ring(obj->last_read_req);
2195
2196         if (old_ring != ring && obj->last_write_req) {
2197                 /* Keep the request relative to the current ring */
2198                 i915_gem_request_assign(&obj->last_write_req, req);
2199         }
2200
2201         /* Add a reference if we're newly entering the active list. */
2202         if (!obj->active) {
2203                 drm_gem_object_reference(&obj->base);
2204                 obj->active = 1;
2205         }
2206
2207         list_move_tail(&obj->ring_list, &ring->active_list);
2208
2209         i915_gem_request_assign(&obj->last_read_req, req);
2210 }
2211
2212 void i915_vma_move_to_active(struct i915_vma *vma,
2213                              struct intel_engine_cs *ring)
2214 {
2215         list_move_tail(&vma->mm_list, &vma->vm->active_list);
2216         return i915_gem_object_move_to_active(vma->obj, ring);
2217 }
2218
2219 static void
2220 i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
2221 {
2222         struct i915_vma *vma;
2223
2224         BUG_ON(obj->base.write_domain & ~I915_GEM_GPU_DOMAINS);
2225         BUG_ON(!obj->active);
2226
2227         list_for_each_entry(vma, &obj->vma_list, vma_link) {
2228                 if (!list_empty(&vma->mm_list))
2229                         list_move_tail(&vma->mm_list, &vma->vm->inactive_list);
2230         }
2231
2232         intel_fb_obj_flush(obj, true);
2233
2234         list_del_init(&obj->ring_list);
2235
2236         i915_gem_request_assign(&obj->last_read_req, NULL);
2237         i915_gem_request_assign(&obj->last_write_req, NULL);
2238         obj->base.write_domain = 0;
2239
2240         i915_gem_request_assign(&obj->last_fenced_req, NULL);
2241
2242         obj->active = 0;
2243         drm_gem_object_unreference(&obj->base);
2244
2245         WARN_ON(i915_verify_lists(dev));
2246 }
2247
2248 static void
2249 i915_gem_object_retire(struct drm_i915_gem_object *obj)
2250 {
2251         if (obj->last_read_req == NULL)
2252                 return;
2253
2254         if (i915_gem_request_completed(obj->last_read_req, true))
2255                 i915_gem_object_move_to_inactive(obj);
2256 }
2257
2258 static int
2259 i915_gem_init_seqno(struct drm_device *dev, u32 seqno)
2260 {
2261         struct drm_i915_private *dev_priv = dev->dev_private;
2262         struct intel_engine_cs *ring;
2263         int ret, i, j;
2264
2265         /* Carefully retire all requests without writing to the rings */
2266         for_each_ring(ring, dev_priv, i) {
2267                 ret = intel_ring_idle(ring);
2268                 if (ret)
2269                         return ret;
2270         }
2271         i915_gem_retire_requests(dev);
2272
2273         /* Finally reset hw state */
2274         for_each_ring(ring, dev_priv, i) {
2275                 intel_ring_init_seqno(ring, seqno);
2276
2277                 for (j = 0; j < ARRAY_SIZE(ring->semaphore.sync_seqno); j++)
2278                         ring->semaphore.sync_seqno[j] = 0;
2279         }
2280
2281         return 0;
2282 }
2283
2284 int i915_gem_set_seqno(struct drm_device *dev, u32 seqno)
2285 {
2286         struct drm_i915_private *dev_priv = dev->dev_private;
2287         int ret;
2288
2289         if (seqno == 0)
2290                 return -EINVAL;
2291
2292         /* HWS page needs to be set less than what we
2293          * will inject to ring
2294          */
2295         ret = i915_gem_init_seqno(dev, seqno - 1);
2296         if (ret)
2297                 return ret;
2298
2299         /* Carefully set the last_seqno value so that wrap
2300          * detection still works
2301          */
2302         dev_priv->next_seqno = seqno;
2303         dev_priv->last_seqno = seqno - 1;
2304         if (dev_priv->last_seqno == 0)
2305                 dev_priv->last_seqno--;
2306
2307         return 0;
2308 }
2309
2310 int
2311 i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
2312 {
2313         struct drm_i915_private *dev_priv = dev->dev_private;
2314
2315         /* reserve 0 for non-seqno */
2316         if (dev_priv->next_seqno == 0) {
2317                 int ret = i915_gem_init_seqno(dev, 0);
2318                 if (ret)
2319                         return ret;
2320
2321                 dev_priv->next_seqno = 1;
2322         }
2323
2324         *seqno = dev_priv->last_seqno = dev_priv->next_seqno++;
2325         return 0;
2326 }
2327
2328 int __i915_add_request(struct intel_engine_cs *ring,
2329                        struct drm_file *file,
2330                        struct drm_i915_gem_object *obj)
2331 {
2332         struct drm_i915_private *dev_priv = ring->dev->dev_private;
2333         struct drm_i915_gem_request *request;
2334         struct intel_ringbuffer *ringbuf;
2335         u32 request_start;
2336         int ret;
2337
2338         request = ring->outstanding_lazy_request;
2339         if (WARN_ON(request == NULL))
2340                 return -ENOMEM;
2341
2342         if (i915.enable_execlists) {
2343                 ringbuf = request->ctx->engine[ring->id].ringbuf;
2344         } else
2345                 ringbuf = ring->buffer;
2346
2347         request_start = intel_ring_get_tail(ringbuf);
2348         /*
2349          * Emit any outstanding flushes - execbuf can fail to emit the flush
2350          * after having emitted the batchbuffer command. Hence we need to fix
2351          * things up similar to emitting the lazy request. The difference here
2352          * is that the flush _must_ happen before the next request, no matter
2353          * what.
2354          */
2355         if (i915.enable_execlists) {
2356                 ret = logical_ring_flush_all_caches(ringbuf, request->ctx);
2357                 if (ret)
2358                         return ret;
2359         } else {
2360                 ret = intel_ring_flush_all_caches(ring);
2361                 if (ret)
2362                         return ret;
2363         }
2364
2365         /* Record the position of the start of the request so that
2366          * should we detect the updated seqno part-way through the
2367          * GPU processing the request, we never over-estimate the
2368          * position of the head.
2369          */
2370         request->postfix = intel_ring_get_tail(ringbuf);
2371
2372         if (i915.enable_execlists) {
2373                 ret = ring->emit_request(ringbuf, request);
2374                 if (ret)
2375                         return ret;
2376         } else {
2377                 ret = ring->add_request(ring);
2378                 if (ret)
2379                         return ret;
2380         }
2381
2382         request->head = request_start;
2383         request->tail = intel_ring_get_tail(ringbuf);
2384
2385         /* Whilst this request exists, batch_obj will be on the
2386          * active_list, and so will hold the active reference. Only when this
2387          * request is retired will the the batch_obj be moved onto the
2388          * inactive_list and lose its active reference. Hence we do not need
2389          * to explicitly hold another reference here.
2390          */
2391         request->batch_obj = obj;
2392
2393         if (!i915.enable_execlists) {
2394                 /* Hold a reference to the current context so that we can inspect
2395                  * it later in case a hangcheck error event fires.
2396                  */
2397                 request->ctx = ring->last_context;
2398                 if (request->ctx)
2399                         i915_gem_context_reference(request->ctx);
2400         }
2401
2402         request->emitted_jiffies = jiffies;
2403         list_add_tail(&request->list, &ring->request_list);
2404         request->file_priv = NULL;
2405
2406         if (file) {
2407                 struct drm_i915_file_private *file_priv = file->driver_priv;
2408
2409                 spin_lock(&file_priv->mm.lock);
2410                 request->file_priv = file_priv;
2411                 list_add_tail(&request->client_list,
2412                               &file_priv->mm.request_list);
2413                 spin_unlock(&file_priv->mm.lock);
2414
2415                 request->pid = get_pid(task_pid(current));
2416         }
2417
2418         trace_i915_gem_request_add(request);
2419         ring->outstanding_lazy_request = NULL;
2420
2421         i915_queue_hangcheck(ring->dev);
2422
2423         cancel_delayed_work_sync(&dev_priv->mm.idle_work);
2424         queue_delayed_work(dev_priv->wq,
2425                            &dev_priv->mm.retire_work,
2426                            round_jiffies_up_relative(HZ));
2427         intel_mark_busy(dev_priv->dev);
2428
2429         return 0;
2430 }
2431
2432 static inline void
2433 i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
2434 {
2435         struct drm_i915_file_private *file_priv = request->file_priv;
2436
2437         if (!file_priv)
2438                 return;
2439
2440         spin_lock(&file_priv->mm.lock);
2441         list_del(&request->client_list);
2442         request->file_priv = NULL;
2443         spin_unlock(&file_priv->mm.lock);
2444 }
2445
2446 static bool i915_context_is_banned(struct drm_i915_private *dev_priv,
2447                                    const struct intel_context *ctx)
2448 {
2449         unsigned long elapsed;
2450
2451         elapsed = get_seconds() - ctx->hang_stats.guilty_ts;
2452
2453         if (ctx->hang_stats.banned)
2454                 return true;
2455
2456         if (ctx->hang_stats.ban_period_seconds &&
2457             elapsed <= ctx->hang_stats.ban_period_seconds) {
2458                 if (!i915_gem_context_is_default(ctx)) {
2459                         DRM_DEBUG("context hanging too fast, banning!\n");
2460                         return true;
2461                 } else if (i915_stop_ring_allow_ban(dev_priv)) {
2462                         if (i915_stop_ring_allow_warn(dev_priv))
2463                                 DRM_ERROR("gpu hanging too fast, banning!\n");
2464                         return true;
2465                 }
2466         }
2467
2468         return false;
2469 }
2470
2471 static void i915_set_reset_status(struct drm_i915_private *dev_priv,
2472                                   struct intel_context *ctx,
2473                                   const bool guilty)
2474 {
2475         struct i915_ctx_hang_stats *hs;
2476
2477         if (WARN_ON(!ctx))
2478                 return;
2479
2480         hs = &ctx->hang_stats;
2481
2482         if (guilty) {
2483                 hs->banned = i915_context_is_banned(dev_priv, ctx);
2484                 hs->batch_active++;
2485                 hs->guilty_ts = get_seconds();
2486         } else {
2487                 hs->batch_pending++;
2488         }
2489 }
2490
2491 static void i915_gem_free_request(struct drm_i915_gem_request *request)
2492 {
2493         list_del(&request->list);
2494         i915_gem_request_remove_from_client(request);
2495
2496         put_pid(request->pid);
2497
2498         i915_gem_request_unreference(request);
2499 }
2500
2501 void i915_gem_request_free(struct kref *req_ref)
2502 {
2503         struct drm_i915_gem_request *req = container_of(req_ref,
2504                                                  typeof(*req), ref);
2505         struct intel_context *ctx = req->ctx;
2506
2507         if (ctx) {
2508                 if (i915.enable_execlists) {
2509                         struct intel_engine_cs *ring = req->ring;
2510
2511                         if (ctx != ring->default_context)
2512                                 intel_lr_context_unpin(ring, ctx);
2513                 }
2514
2515                 i915_gem_context_unreference(ctx);
2516         }
2517
2518         kfree(req);
2519 }
2520
2521 struct drm_i915_gem_request *
2522 i915_gem_find_active_request(struct intel_engine_cs *ring)
2523 {
2524         struct drm_i915_gem_request *request;
2525
2526         list_for_each_entry(request, &ring->request_list, list) {
2527                 if (i915_gem_request_completed(request, false))
2528                         continue;
2529
2530                 return request;
2531         }
2532
2533         return NULL;
2534 }
2535
2536 static void i915_gem_reset_ring_status(struct drm_i915_private *dev_priv,
2537                                        struct intel_engine_cs *ring)
2538 {
2539         struct drm_i915_gem_request *request;
2540         bool ring_hung;
2541
2542         request = i915_gem_find_active_request(ring);
2543
2544         if (request == NULL)
2545                 return;
2546
2547         ring_hung = ring->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG;
2548
2549         i915_set_reset_status(dev_priv, request->ctx, ring_hung);
2550
2551         list_for_each_entry_continue(request, &ring->request_list, list)
2552                 i915_set_reset_status(dev_priv, request->ctx, false);
2553 }
2554
2555 static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
2556                                         struct intel_engine_cs *ring)
2557 {
2558         while (!list_empty(&ring->active_list)) {
2559                 struct drm_i915_gem_object *obj;
2560
2561                 obj = list_first_entry(&ring->active_list,
2562                                        struct drm_i915_gem_object,
2563                                        ring_list);
2564
2565                 i915_gem_object_move_to_inactive(obj);
2566         }
2567
2568         /*
2569          * Clear the execlists queue up before freeing the requests, as those
2570          * are the ones that keep the context and ringbuffer backing objects
2571          * pinned in place.
2572          */
2573         while (!list_empty(&ring->execlist_queue)) {
2574                 struct drm_i915_gem_request *submit_req;
2575
2576                 submit_req = list_first_entry(&ring->execlist_queue,
2577                                 struct drm_i915_gem_request,
2578                                 execlist_link);
2579                 list_del(&submit_req->execlist_link);
2580                 intel_runtime_pm_put(dev_priv);
2581
2582                 if (submit_req->ctx != ring->default_context)
2583                         intel_lr_context_unpin(ring, submit_req->ctx);
2584
2585                 i915_gem_request_unreference(submit_req);
2586         }
2587
2588         /*
2589          * We must free the requests after all the corresponding objects have
2590          * been moved off active lists. Which is the same order as the normal
2591          * retire_requests function does. This is important if object hold
2592          * implicit references on things like e.g. ppgtt address spaces through
2593          * the request.
2594          */
2595         while (!list_empty(&ring->request_list)) {
2596                 struct drm_i915_gem_request *request;
2597
2598                 request = list_first_entry(&ring->request_list,
2599                                            struct drm_i915_gem_request,
2600                                            list);
2601
2602                 i915_gem_free_request(request);
2603         }
2604
2605         /* This may not have been flushed before the reset, so clean it now */
2606         i915_gem_request_assign(&ring->outstanding_lazy_request, NULL);
2607 }
2608
2609 void i915_gem_restore_fences(struct drm_device *dev)
2610 {
2611         struct drm_i915_private *dev_priv = dev->dev_private;
2612         int i;
2613
2614         for (i = 0; i < dev_priv->num_fence_regs; i++) {
2615                 struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
2616
2617                 /*
2618                  * Commit delayed tiling changes if we have an object still
2619                  * attached to the fence, otherwise just clear the fence.
2620                  */
2621                 if (reg->obj) {
2622                         i915_gem_object_update_fence(reg->obj, reg,
2623                                                      reg->obj->tiling_mode);
2624                 } else {
2625                         i915_gem_write_fence(dev, i, NULL);
2626                 }
2627         }
2628 }
2629
2630 void i915_gem_reset(struct drm_device *dev)
2631 {
2632         struct drm_i915_private *dev_priv = dev->dev_private;
2633         struct intel_engine_cs *ring;
2634         int i;
2635
2636         /*
2637          * Before we free the objects from the requests, we need to inspect
2638          * them for finding the guilty party. As the requests only borrow
2639          * their reference to the objects, the inspection must be done first.
2640          */
2641         for_each_ring(ring, dev_priv, i)
2642                 i915_gem_reset_ring_status(dev_priv, ring);
2643
2644         for_each_ring(ring, dev_priv, i)
2645                 i915_gem_reset_ring_cleanup(dev_priv, ring);
2646
2647         i915_gem_context_reset(dev);
2648
2649         i915_gem_restore_fences(dev);
2650 }
2651
2652 /**
2653  * This function clears the request list as sequence numbers are passed.
2654  */
2655 void
2656 i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
2657 {
2658         if (list_empty(&ring->request_list))
2659                 return;
2660
2661         WARN_ON(i915_verify_lists(ring->dev));
2662
2663         /* Retire requests first as we use it above for the early return.
2664          * If we retire requests last, we may use a later seqno and so clear
2665          * the requests lists without clearing the active list, leading to
2666          * confusion.
2667          */
2668         while (!list_empty(&ring->request_list)) {
2669                 struct drm_i915_gem_request *request;
2670
2671                 request = list_first_entry(&ring->request_list,
2672                                            struct drm_i915_gem_request,
2673                                            list);
2674
2675                 if (!i915_gem_request_completed(request, true))
2676                         break;
2677
2678                 trace_i915_gem_request_retire(request);
2679
2680                 /* We know the GPU must have read the request to have
2681                  * sent us the seqno + interrupt, so use the position
2682                  * of tail of the request to update the last known position
2683                  * of the GPU head.
2684                  */
2685                 request->ringbuf->last_retired_head = request->postfix;
2686
2687                 i915_gem_free_request(request);
2688         }
2689
2690         /* Move any buffers on the active list that are no longer referenced
2691          * by the ringbuffer to the flushing/inactive lists as appropriate,
2692          * before we free the context associated with the requests.
2693          */
2694         while (!list_empty(&ring->active_list)) {
2695                 struct drm_i915_gem_object *obj;
2696
2697                 obj = list_first_entry(&ring->active_list,
2698                                       struct drm_i915_gem_object,
2699                                       ring_list);
2700
2701                 if (!i915_gem_request_completed(obj->last_read_req, true))
2702                         break;
2703
2704                 i915_gem_object_move_to_inactive(obj);
2705         }
2706
2707         if (unlikely(ring->trace_irq_req &&
2708                      i915_gem_request_completed(ring->trace_irq_req, true))) {
2709                 ring->irq_put(ring);
2710                 i915_gem_request_assign(&ring->trace_irq_req, NULL);
2711         }
2712
2713         WARN_ON(i915_verify_lists(ring->dev));
2714 }
2715
2716 bool
2717 i915_gem_retire_requests(struct drm_device *dev)
2718 {
2719         struct drm_i915_private *dev_priv = dev->dev_private;
2720         struct intel_engine_cs *ring;
2721         bool idle = true;
2722         int i;
2723
2724         for_each_ring(ring, dev_priv, i) {
2725                 i915_gem_retire_requests_ring(ring);
2726                 idle &= list_empty(&ring->request_list);
2727                 if (i915.enable_execlists) {
2728                         unsigned long flags;
2729
2730                         spin_lock_irqsave(&ring->execlist_lock, flags);
2731                         idle &= list_empty(&ring->execlist_queue);
2732                         spin_unlock_irqrestore(&ring->execlist_lock, flags);
2733
2734                         intel_execlists_retire_requests(ring);
2735                 }
2736         }
2737
2738         if (idle)
2739                 mod_delayed_work(dev_priv->wq,
2740                                    &dev_priv->mm.idle_work,
2741                                    msecs_to_jiffies(100));
2742
2743         return idle;
2744 }
2745
2746 static void
2747 i915_gem_retire_work_handler(struct work_struct *work)
2748 {
2749         struct drm_i915_private *dev_priv =
2750                 container_of(work, typeof(*dev_priv), mm.retire_work.work);
2751         struct drm_device *dev = dev_priv->dev;
2752         bool idle;
2753
2754         /* Come back later if the device is busy... */
2755         idle = false;
2756         if (mutex_trylock(&dev->struct_mutex)) {
2757                 idle = i915_gem_retire_requests(dev);
2758                 mutex_unlock(&dev->struct_mutex);
2759         }
2760         if (!idle)
2761                 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work,
2762                                    round_jiffies_up_relative(HZ));
2763 }
2764
2765 static void
2766 i915_gem_idle_work_handler(struct work_struct *work)
2767 {
2768         struct drm_i915_private *dev_priv =
2769                 container_of(work, typeof(*dev_priv), mm.idle_work.work);
2770
2771         intel_mark_idle(dev_priv->dev);
2772 }
2773
2774 /**
2775  * Ensures that an object will eventually get non-busy by flushing any required
2776  * write domains, emitting any outstanding lazy request and retiring and
2777  * completed requests.
2778  */
2779 static int
2780 i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
2781 {
2782         struct intel_engine_cs *ring;
2783         int ret;
2784
2785         if (obj->active) {
2786                 ring = i915_gem_request_get_ring(obj->last_read_req);
2787
2788                 ret = i915_gem_check_olr(obj->last_read_req);
2789                 if (ret)
2790                         return ret;
2791
2792                 i915_gem_retire_requests_ring(ring);
2793         }
2794
2795         return 0;
2796 }
2797
2798 /**
2799  * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
2800  * @DRM_IOCTL_ARGS: standard ioctl arguments
2801  *
2802  * Returns 0 if successful, else an error is returned with the remaining time in
2803  * the timeout parameter.
2804  *  -ETIME: object is still busy after timeout
2805  *  -ERESTARTSYS: signal interrupted the wait
2806  *  -ENONENT: object doesn't exist
2807  * Also possible, but rare:
2808  *  -EAGAIN: GPU wedged
2809  *  -ENOMEM: damn
2810  *  -ENODEV: Internal IRQ fail
2811  *  -E?: The add request failed
2812  *
2813  * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any
2814  * non-zero timeout parameter the wait ioctl will wait for the given number of
2815  * nanoseconds on an object becoming unbusy. Since the wait itself does so
2816  * without holding struct_mutex the object may become re-busied before this
2817  * function completes. A similar but shorter * race condition exists in the busy
2818  * ioctl
2819  */
2820 int
2821 i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
2822 {
2823         struct drm_i915_private *dev_priv = dev->dev_private;
2824         struct drm_i915_gem_wait *args = data;
2825         struct drm_i915_gem_object *obj;
2826         struct drm_i915_gem_request *req;
2827         unsigned reset_counter;
2828         int ret = 0;
2829
2830         if (args->flags != 0)
2831                 return -EINVAL;
2832
2833         ret = i915_mutex_lock_interruptible(dev);
2834         if (ret)
2835                 return ret;
2836
2837         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->bo_handle));
2838         if (&obj->base == NULL) {
2839                 mutex_unlock(&dev->struct_mutex);
2840                 return -ENOENT;
2841         }
2842
2843         /* Need to make sure the object gets inactive eventually. */
2844         ret = i915_gem_object_flush_active(obj);
2845         if (ret)
2846                 goto out;
2847
2848         if (!obj->active || !obj->last_read_req)
2849                 goto out;
2850
2851         req = obj->last_read_req;
2852
2853         /* Do this after OLR check to make sure we make forward progress polling
2854          * on this IOCTL with a timeout == 0 (like busy ioctl)
2855          */
2856         if (args->timeout_ns == 0) {
2857                 ret = -ETIME;
2858                 goto out;
2859         }
2860
2861         drm_gem_object_unreference(&obj->base);
2862         reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
2863         i915_gem_request_reference(req);
2864         mutex_unlock(&dev->struct_mutex);
2865
2866         ret = __i915_wait_request(req, reset_counter, true,
2867                                   args->timeout_ns > 0 ? &args->timeout_ns : NULL,
2868                                   file->driver_priv);
2869         mutex_lock(&dev->struct_mutex);
2870         i915_gem_request_unreference(req);
2871         mutex_unlock(&dev->struct_mutex);
2872         return ret;
2873
2874 out:
2875         drm_gem_object_unreference(&obj->base);
2876         mutex_unlock(&dev->struct_mutex);
2877         return ret;
2878 }
2879
2880 /**
2881  * i915_gem_object_sync - sync an object to a ring.
2882  *
2883  * @obj: object which may be in use on another ring.
2884  * @to: ring we wish to use the object on. May be NULL.
2885  *
2886  * This code is meant to abstract object synchronization with the GPU.
2887  * Calling with NULL implies synchronizing the object with the CPU
2888  * rather than a particular GPU ring.
2889  *
2890  * Returns 0 if successful, else propagates up the lower layer error.
2891  */
2892 int
2893 i915_gem_object_sync(struct drm_i915_gem_object *obj,
2894                      struct intel_engine_cs *to)
2895 {
2896         struct intel_engine_cs *from;
2897         u32 seqno;
2898         int ret, idx;
2899
2900         from = i915_gem_request_get_ring(obj->last_read_req);
2901
2902         if (from == NULL || to == from)
2903                 return 0;
2904
2905         if (to == NULL || !i915_semaphore_is_enabled(obj->base.dev))
2906                 return i915_gem_object_wait_rendering(obj, false);
2907
2908         idx = intel_ring_sync_index(from, to);
2909
2910         seqno = i915_gem_request_get_seqno(obj->last_read_req);
2911         /* Optimization: Avoid semaphore sync when we are sure we already
2912          * waited for an object with higher seqno */
2913         if (seqno <= from->semaphore.sync_seqno[idx])
2914                 return 0;
2915
2916         ret = i915_gem_check_olr(obj->last_read_req);
2917         if (ret)
2918                 return ret;
2919
2920         trace_i915_gem_ring_sync_to(from, to, obj->last_read_req);
2921         ret = to->semaphore.sync_to(to, from, seqno);
2922         if (!ret)
2923                 /* We use last_read_req because sync_to()
2924                  * might have just caused seqno wrap under
2925                  * the radar.
2926                  */
2927                 from->semaphore.sync_seqno[idx] =
2928                                 i915_gem_request_get_seqno(obj->last_read_req);
2929
2930         return ret;
2931 }
2932
2933 static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
2934 {
2935         u32 old_write_domain, old_read_domains;
2936
2937         /* Force a pagefault for domain tracking on next user access */
2938         i915_gem_release_mmap(obj);
2939
2940         if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
2941                 return;
2942
2943         /* Wait for any direct GTT access to complete */
2944         mb();
2945
2946         old_read_domains = obj->base.read_domains;
2947         old_write_domain = obj->base.write_domain;
2948
2949         obj->base.read_domains &= ~I915_GEM_DOMAIN_GTT;
2950         obj->base.write_domain &= ~I915_GEM_DOMAIN_GTT;
2951
2952         trace_i915_gem_object_change_domain(obj,
2953                                             old_read_domains,
2954                                             old_write_domain);
2955 }
2956
2957 int i915_vma_unbind(struct i915_vma *vma)
2958 {
2959         struct drm_i915_gem_object *obj = vma->obj;
2960         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2961         int ret;
2962
2963         if (list_empty(&vma->vma_link))
2964                 return 0;
2965
2966         if (!drm_mm_node_allocated(&vma->node)) {
2967                 i915_gem_vma_destroy(vma);
2968                 return 0;
2969         }
2970
2971         if (vma->pin_count)
2972                 return -EBUSY;
2973
2974         BUG_ON(obj->pages == NULL);
2975
2976         ret = i915_gem_object_finish_gpu(obj);
2977         if (ret)
2978                 return ret;
2979         /* Continue on if we fail due to EIO, the GPU is hung so we
2980          * should be safe and we need to cleanup or else we might
2981          * cause memory corruption through use-after-free.
2982          */
2983
2984         if (i915_is_ggtt(vma->vm) &&
2985             vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
2986                 i915_gem_object_finish_gtt(obj);
2987
2988                 /* release the fence reg _after_ flushing */
2989                 ret = i915_gem_object_put_fence(obj);
2990                 if (ret)
2991                         return ret;
2992         }
2993
2994         trace_i915_vma_unbind(vma);
2995
2996         vma->unbind_vma(vma);
2997
2998         list_del_init(&vma->mm_list);
2999         if (i915_is_ggtt(vma->vm)) {
3000                 if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
3001                         obj->map_and_fenceable = false;
3002                 } else if (vma->ggtt_view.pages) {
3003                         sg_free_table(vma->ggtt_view.pages);
3004                         kfree(vma->ggtt_view.pages);
3005                         vma->ggtt_view.pages = NULL;
3006                 }
3007         }
3008
3009         drm_mm_remove_node(&vma->node);
3010         i915_gem_vma_destroy(vma);
3011
3012         /* Since the unbound list is global, only move to that list if
3013          * no more VMAs exist. */
3014         if (list_empty(&obj->vma_list)) {
3015                 /* Throw away the active reference before
3016                  * moving to the unbound list. */
3017                 i915_gem_object_retire(obj);
3018
3019                 i915_gem_gtt_finish_object(obj);
3020                 list_move_tail(&obj->global_list, &dev_priv->mm.unbound_list);
3021         }
3022
3023         /* And finally now the object is completely decoupled from this vma,
3024          * we can drop its hold on the backing storage and allow it to be
3025          * reaped by the shrinker.
3026          */
3027         i915_gem_object_unpin_pages(obj);
3028
3029         return 0;
3030 }
3031
3032 int i915_gpu_idle(struct drm_device *dev)
3033 {
3034         struct drm_i915_private *dev_priv = dev->dev_private;
3035         struct intel_engine_cs *ring;
3036         int ret, i;
3037
3038         /* Flush everything onto the inactive list. */
3039         for_each_ring(ring, dev_priv, i) {
3040                 if (!i915.enable_execlists) {
3041                         ret = i915_switch_context(ring, ring->default_context);
3042                         if (ret)
3043                                 return ret;
3044                 }
3045
3046                 ret = intel_ring_idle(ring);
3047                 if (ret)
3048                         return ret;
3049         }
3050
3051         return 0;
3052 }
3053
3054 static void i965_write_fence_reg(struct drm_device *dev, int reg,
3055                                  struct drm_i915_gem_object *obj)
3056 {
3057         struct drm_i915_private *dev_priv = dev->dev_private;
3058         int fence_reg;
3059         int fence_pitch_shift;
3060
3061         if (INTEL_INFO(dev)->gen >= 6) {
3062                 fence_reg = FENCE_REG_SANDYBRIDGE_0;
3063                 fence_pitch_shift = SANDYBRIDGE_FENCE_PITCH_SHIFT;
3064         } else {
3065                 fence_reg = FENCE_REG_965_0;
3066                 fence_pitch_shift = I965_FENCE_PITCH_SHIFT;
3067         }
3068
3069         fence_reg += reg * 8;
3070
3071         /* To w/a incoherency with non-atomic 64-bit register updates,
3072          * we split the 64-bit update into two 32-bit writes. In order
3073          * for a partial fence not to be evaluated between writes, we
3074          * precede the update with write to turn off the fence register,
3075          * and only enable the fence as the last step.
3076          *
3077          * For extra levels of paranoia, we make sure each step lands
3078          * before applying the next step.
3079          */
3080         I915_WRITE(fence_reg, 0);
3081         POSTING_READ(fence_reg);
3082
3083         if (obj) {
3084                 u32 size = i915_gem_obj_ggtt_size(obj);
3085                 uint64_t val;
3086
3087                 /* Adjust fence size to match tiled area */
3088                 if (obj->tiling_mode != I915_TILING_NONE) {
3089                         uint32_t row_size = obj->stride *
3090                                 (obj->tiling_mode == I915_TILING_Y ? 32 : 8);
3091                         size = (size / row_size) * row_size;
3092                 }
3093
3094                 val = (uint64_t)((i915_gem_obj_ggtt_offset(obj) + size - 4096) &
3095                                  0xfffff000) << 32;
3096                 val |= i915_gem_obj_ggtt_offset(obj) & 0xfffff000;
3097                 val |= (uint64_t)((obj->stride / 128) - 1) << fence_pitch_shift;
3098                 if (obj->tiling_mode == I915_TILING_Y)
3099                         val |= 1 << I965_FENCE_TILING_Y_SHIFT;
3100                 val |= I965_FENCE_REG_VALID;
3101
3102                 I915_WRITE(fence_reg + 4, val >> 32);
3103                 POSTING_READ(fence_reg + 4);
3104
3105                 I915_WRITE(fence_reg + 0, val);
3106                 POSTING_READ(fence_reg);
3107         } else {
3108                 I915_WRITE(fence_reg + 4, 0);
3109                 POSTING_READ(fence_reg + 4);
3110         }
3111 }
3112
3113 static void i915_write_fence_reg(struct drm_device *dev, int reg,
3114                                  struct drm_i915_gem_object *obj)
3115 {
3116         struct drm_i915_private *dev_priv = dev->dev_private;
3117         u32 val;
3118
3119         if (obj) {
3120                 u32 size = i915_gem_obj_ggtt_size(obj);
3121                 int pitch_val;
3122                 int tile_width;
3123
3124                 WARN((i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK) ||
3125                      (size & -size) != size ||
3126                      (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
3127                      "object 0x%08lx [fenceable? %d] not 1M or pot-size (0x%08x) aligned\n",
3128                      i915_gem_obj_ggtt_offset(obj), obj->map_and_fenceable, size);
3129
3130                 if (obj->tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
3131                         tile_width = 128;
3132                 else
3133                         tile_width = 512;
3134
3135                 /* Note: pitch better be a power of two tile widths */
3136                 pitch_val = obj->stride / tile_width;
3137                 pitch_val = ffs(pitch_val) - 1;
3138
3139                 val = i915_gem_obj_ggtt_offset(obj);
3140                 if (obj->tiling_mode == I915_TILING_Y)
3141                         val |= 1 << I830_FENCE_TILING_Y_SHIFT;
3142                 val |= I915_FENCE_SIZE_BITS(size);
3143                 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
3144                 val |= I830_FENCE_REG_VALID;
3145         } else
3146                 val = 0;
3147
3148         if (reg < 8)
3149                 reg = FENCE_REG_830_0 + reg * 4;
3150         else
3151                 reg = FENCE_REG_945_8 + (reg - 8) * 4;
3152
3153         I915_WRITE(reg, val);
3154         POSTING_READ(reg);
3155 }
3156
3157 static void i830_write_fence_reg(struct drm_device *dev, int reg,
3158                                 struct drm_i915_gem_object *obj)
3159 {
3160         struct drm_i915_private *dev_priv = dev->dev_private;
3161         uint32_t val;
3162
3163         if (obj) {
3164                 u32 size = i915_gem_obj_ggtt_size(obj);
3165                 uint32_t pitch_val;
3166
3167                 WARN((i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK) ||
3168                      (size & -size) != size ||
3169                      (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
3170                      "object 0x%08lx not 512K or pot-size 0x%08x aligned\n",
3171                      i915_gem_obj_ggtt_offset(obj), size);
3172
3173                 pitch_val = obj->stride / 128;
3174                 pitch_val = ffs(pitch_val) - 1;
3175
3176                 val = i915_gem_obj_ggtt_offset(obj);
3177                 if (obj->tiling_mode == I915_TILING_Y)
3178                         val |= 1 << I830_FENCE_TILING_Y_SHIFT;
3179                 val |= I830_FENCE_SIZE_BITS(size);
3180                 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
3181                 val |= I830_FENCE_REG_VALID;
3182         } else
3183                 val = 0;
3184
3185         I915_WRITE(FENCE_REG_830_0 + reg * 4, val);
3186         POSTING_READ(FENCE_REG_830_0 + reg * 4);
3187 }
3188
3189 inline static bool i915_gem_object_needs_mb(struct drm_i915_gem_object *obj)
3190 {
3191         return obj && obj->base.read_domains & I915_GEM_DOMAIN_GTT;
3192 }
3193
3194 static void i915_gem_write_fence(struct drm_device *dev, int reg,
3195                                  struct drm_i915_gem_object *obj)
3196 {
3197         struct drm_i915_private *dev_priv = dev->dev_private;
3198
3199         /* Ensure that all CPU reads are completed before installing a fence
3200          * and all writes before removing the fence.
3201          */
3202         if (i915_gem_object_needs_mb(dev_priv->fence_regs[reg].obj))
3203                 mb();
3204
3205         WARN(obj && (!obj->stride || !obj->tiling_mode),
3206              "bogus fence setup with stride: 0x%x, tiling mode: %i\n",
3207              obj->stride, obj->tiling_mode);
3208
3209         if (IS_GEN2(dev))
3210                 i830_write_fence_reg(dev, reg, obj);
3211         else if (IS_GEN3(dev))
3212                 i915_write_fence_reg(dev, reg, obj);
3213         else if (INTEL_INFO(dev)->gen >= 4)
3214                 i965_write_fence_reg(dev, reg, obj);
3215
3216         /* And similarly be paranoid that no direct access to this region
3217          * is reordered to before the fence is installed.
3218          */
3219         if (i915_gem_object_needs_mb(obj))
3220                 mb();
3221 }
3222
3223 static inline int fence_number(struct drm_i915_private *dev_priv,
3224                                struct drm_i915_fence_reg *fence)
3225 {
3226         return fence - dev_priv->fence_regs;
3227 }
3228
3229 static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
3230                                          struct drm_i915_fence_reg *fence,
3231                                          bool enable)
3232 {
3233         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
3234         int reg = fence_number(dev_priv, fence);
3235
3236         i915_gem_write_fence(obj->base.dev, reg, enable ? obj : NULL);
3237
3238         if (enable) {
3239                 obj->fence_reg = reg;
3240                 fence->obj = obj;
3241                 list_move_tail(&fence->lru_list, &dev_priv->mm.fence_list);
3242         } else {
3243                 obj->fence_reg = I915_FENCE_REG_NONE;
3244                 fence->obj = NULL;
3245                 list_del_init(&fence->lru_list);
3246         }
3247         obj->fence_dirty = false;
3248 }
3249
3250 static int
3251 i915_gem_object_wait_fence(struct drm_i915_gem_object *obj)
3252 {
3253         if (obj->last_fenced_req) {
3254                 int ret = i915_wait_request(obj->last_fenced_req);
3255                 if (ret)
3256                         return ret;
3257
3258                 i915_gem_request_assign(&obj->last_fenced_req, NULL);
3259         }
3260
3261         return 0;
3262 }
3263
3264 int
3265 i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
3266 {
3267         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
3268         struct drm_i915_fence_reg *fence;
3269         int ret;
3270
3271         ret = i915_gem_object_wait_fence(obj);
3272         if (ret)
3273                 return ret;
3274
3275         if (obj->fence_reg == I915_FENCE_REG_NONE)
3276                 return 0;
3277
3278         fence = &dev_priv->fence_regs[obj->fence_reg];
3279
3280         if (WARN_ON(fence->pin_count))
3281                 return -EBUSY;
3282
3283         i915_gem_object_fence_lost(obj);
3284         i915_gem_object_update_fence(obj, fence, false);
3285
3286         return 0;
3287 }
3288
3289 static struct drm_i915_fence_reg *
3290 i915_find_fence_reg(struct drm_device *dev)
3291 {
3292         struct drm_i915_private *dev_priv = dev->dev_private;
3293         struct drm_i915_fence_reg *reg, *avail;
3294         int i;
3295
3296         /* First try to find a free reg */
3297         avail = NULL;
3298         for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
3299                 reg = &dev_priv->fence_regs[i];
3300                 if (!reg->obj)
3301                         return reg;
3302
3303                 if (!reg->pin_count)
3304                         avail = reg;
3305         }
3306
3307         if (avail == NULL)
3308                 goto deadlock;
3309
3310         /* None available, try to steal one or wait for a user to finish */
3311         list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
3312                 if (reg->pin_count)
3313                         continue;
3314
3315                 return reg;
3316         }
3317
3318 deadlock:
3319         /* Wait for completion of pending flips which consume fences */
3320         if (intel_has_pending_fb_unpin(dev))
3321                 return ERR_PTR(-EAGAIN);
3322
3323         return ERR_PTR(-EDEADLK);
3324 }
3325
3326 /**
3327  * i915_gem_object_get_fence - set up fencing for an object
3328  * @obj: object to map through a fence reg
3329  *
3330  * When mapping objects through the GTT, userspace wants to be able to write
3331  * to them without having to worry about swizzling if the object is tiled.
3332  * This function walks the fence regs looking for a free one for @obj,
3333  * stealing one if it can't find any.
3334  *
3335  * It then sets up the reg based on the object's properties: address, pitch
3336  * and tiling format.
3337  *
3338  * For an untiled surface, this removes any existing fence.
3339  */
3340 int
3341 i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
3342 {
3343         struct drm_device *dev = obj->base.dev;
3344         struct drm_i915_private *dev_priv = dev->dev_private;
3345         bool enable = obj->tiling_mode != I915_TILING_NONE;
3346         struct drm_i915_fence_reg *reg;
3347         int ret;
3348
3349         /* Have we updated the tiling parameters upon the object and so
3350          * will need to serialise the write to the associated fence register?
3351          */
3352         if (obj->fence_dirty) {
3353                 ret = i915_gem_object_wait_fence(obj);
3354                 if (ret)
3355                         return ret;
3356         }
3357
3358         /* Just update our place in the LRU if our fence is getting reused. */
3359         if (obj->fence_reg != I915_FENCE_REG_NONE) {
3360                 reg = &dev_priv->fence_regs[obj->fence_reg];
3361                 if (!obj->fence_dirty) {
3362                         list_move_tail(&reg->lru_list,
3363                                        &dev_priv->mm.fence_list);
3364                         return 0;
3365                 }
3366         } else if (enable) {
3367                 if (WARN_ON(!obj->map_and_fenceable))
3368                         return -EINVAL;
3369
3370                 reg = i915_find_fence_reg(dev);
3371                 if (IS_ERR(reg))
3372                         return PTR_ERR(reg);
3373
3374                 if (reg->obj) {
3375                         struct drm_i915_gem_object *old = reg->obj;
3376
3377                         ret = i915_gem_object_wait_fence(old);
3378                         if (ret)
3379                                 return ret;
3380
3381                         i915_gem_object_fence_lost(old);
3382                 }
3383         } else
3384                 return 0;
3385
3386         i915_gem_object_update_fence(obj, reg, enable);
3387
3388         return 0;
3389 }
3390
3391 static bool i915_gem_valid_gtt_space(struct i915_vma *vma,
3392                                      unsigned long cache_level)
3393 {
3394         struct drm_mm_node *gtt_space = &vma->node;
3395         struct drm_mm_node *other;
3396
3397         /*
3398          * On some machines we have to be careful when putting differing types
3399          * of snoopable memory together to avoid the prefetcher crossing memory
3400          * domains and dying. During vm initialisation, we decide whether or not
3401          * these constraints apply and set the drm_mm.color_adjust
3402          * appropriately.
3403          */
3404         if (vma->vm->mm.color_adjust == NULL)
3405                 return true;
3406
3407         if (!drm_mm_node_allocated(gtt_space))
3408                 return true;
3409
3410         if (list_empty(&gtt_space->node_list))
3411                 return true;
3412
3413         other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list);
3414         if (other->allocated && !other->hole_follows && other->color != cache_level)
3415                 return false;
3416
3417         other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list);
3418         if (other->allocated && !gtt_space->hole_follows && other->color != cache_level)
3419                 return false;
3420
3421         return true;
3422 }
3423
3424 /**
3425  * Finds free space in the GTT aperture and binds the object there.
3426  */
3427 static struct i915_vma *
3428 i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
3429                            struct i915_address_space *vm,
3430                            const struct i915_ggtt_view *ggtt_view,
3431                            unsigned alignment,
3432                            uint64_t flags)
3433 {
3434         struct drm_device *dev = obj->base.dev;
3435         struct drm_i915_private *dev_priv = dev->dev_private;
3436         u32 size, fence_size, fence_alignment, unfenced_alignment;
3437         unsigned long start =
3438                 flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
3439         unsigned long end =
3440                 flags & PIN_MAPPABLE ? dev_priv->gtt.mappable_end : vm->total;
3441         struct i915_vma *vma;
3442         int ret;
3443
3444         if(WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
3445                 return ERR_PTR(-EINVAL);
3446
3447         fence_size = i915_gem_get_gtt_size(dev,
3448                                            obj->base.size,
3449                                            obj->tiling_mode);
3450         fence_alignment = i915_gem_get_gtt_alignment(dev,
3451                                                      obj->base.size,
3452                                                      obj->tiling_mode, true);
3453         unfenced_alignment =
3454                 i915_gem_get_gtt_alignment(dev,
3455                                            obj->base.size,
3456                                            obj->tiling_mode, false);
3457
3458         if (alignment == 0)
3459                 alignment = flags & PIN_MAPPABLE ? fence_alignment :
3460                                                 unfenced_alignment;
3461         if (flags & PIN_MAPPABLE && alignment & (fence_alignment - 1)) {
3462                 DRM_DEBUG("Invalid object alignment requested %u\n", alignment);
3463                 return ERR_PTR(-EINVAL);
3464         }
3465
3466         size = flags & PIN_MAPPABLE ? fence_size : obj->base.size;
3467
3468         /* If the object is bigger than the entire aperture, reject it early
3469          * before evicting everything in a vain attempt to find space.
3470          */
3471         if (obj->base.size > end) {
3472                 DRM_DEBUG("Attempting to bind an object larger than the aperture: object=%zd > %s aperture=%lu\n",
3473                           obj->base.size,
3474                           flags & PIN_MAPPABLE ? "mappable" : "total",
3475                           end);
3476                 return ERR_PTR(-E2BIG);
3477         }
3478
3479         ret = i915_gem_object_get_pages(obj);
3480         if (ret)
3481                 return ERR_PTR(ret);
3482
3483         i915_gem_object_pin_pages(obj);
3484
3485         vma = ggtt_view ? i915_gem_obj_lookup_or_create_ggtt_vma(obj, ggtt_view) :
3486                           i915_gem_obj_lookup_or_create_vma(obj, vm);
3487
3488         if (IS_ERR(vma))
3489                 goto err_unpin;
3490
3491 search_free:
3492         ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node,
3493                                                   size, alignment,
3494                                                   obj->cache_level,
3495                                                   start, end,
3496                                                   DRM_MM_SEARCH_DEFAULT,
3497                                                   DRM_MM_CREATE_DEFAULT);
3498         if (ret) {
3499                 ret = i915_gem_evict_something(dev, vm, size, alignment,
3500                                                obj->cache_level,
3501                                                start, end,
3502                                                flags);
3503                 if (ret == 0)
3504                         goto search_free;
3505
3506                 goto err_free_vma;
3507         }
3508         if (WARN_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level))) {
3509                 ret = -EINVAL;
3510                 goto err_remove_node;
3511         }
3512
3513         ret = i915_gem_gtt_prepare_object(obj);
3514         if (ret)
3515                 goto err_remove_node;
3516
3517         /*  allocate before insert / bind */
3518         if (vma->vm->allocate_va_range) {
3519                 trace_i915_va_alloc(vma->vm, vma->node.start, vma->node.size,
3520                                 VM_TO_TRACE_NAME(vma->vm));
3521                 ret = vma->vm->allocate_va_range(vma->vm,
3522                                                 vma->node.start,
3523                                                 vma->node.size);
3524                 if (ret)
3525                         goto err_remove_node;
3526         }
3527
3528         trace_i915_vma_bind(vma, flags);
3529         ret = i915_vma_bind(vma, obj->cache_level,
3530                             flags & PIN_GLOBAL ? GLOBAL_BIND : 0);
3531         if (ret)
3532                 goto err_finish_gtt;
3533
3534         list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
3535         list_add_tail(&vma->mm_list, &vm->inactive_list);
3536
3537         return vma;
3538
3539 err_finish_gtt:
3540         i915_gem_gtt_finish_object(obj);
3541 err_remove_node:
3542         drm_mm_remove_node(&vma->node);
3543 err_free_vma:
3544         i915_gem_vma_destroy(vma);
3545         vma = ERR_PTR(ret);
3546 err_unpin:
3547         i915_gem_object_unpin_pages(obj);
3548         return vma;
3549 }
3550
3551 bool
3552 i915_gem_clflush_object(struct drm_i915_gem_object *obj,
3553                         bool force)
3554 {
3555         /* If we don't have a page list set up, then we're not pinned
3556          * to GPU, and we can ignore the cache flush because it'll happen
3557          * again at bind time.
3558          */
3559         if (obj->pages == NULL)
3560                 return false;
3561
3562         /*
3563          * Stolen memory is always coherent with the GPU as it is explicitly
3564          * marked as wc by the system, or the system is cache-coherent.
3565          */
3566         if (obj->stolen || obj->phys_handle)
3567                 return false;
3568
3569         /* If the GPU is snooping the contents of the CPU cache,
3570          * we do not need to manually clear the CPU cache lines.  However,
3571          * the caches are only snooped when the render cache is
3572          * flushed/invalidated.  As we always have to emit invalidations
3573          * and flushes when moving into and out of the RENDER domain, correct
3574          * snooping behaviour occurs naturally as the result of our domain
3575          * tracking.
3576          */
3577         if (!force && cpu_cache_is_coherent(obj->base.dev, obj->cache_level)) {
3578                 obj->cache_dirty = true;
3579                 return false;
3580         }
3581
3582         trace_i915_gem_object_clflush(obj);
3583         drm_clflush_sg(obj->pages);
3584         obj->cache_dirty = false;
3585
3586         return true;
3587 }
3588
3589 /** Flushes the GTT write domain for the object if it's dirty. */
3590 static void
3591 i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj)
3592 {
3593         uint32_t old_write_domain;
3594
3595         if (obj->base.write_domain != I915_GEM_DOMAIN_GTT)
3596                 return;
3597
3598         /* No actual flushing is required for the GTT write domain.  Writes
3599          * to it immediately go to main memory as far as we know, so there's
3600          * no chipset flush.  It also doesn't land in render cache.
3601          *
3602          * However, we do have to enforce the order so that all writes through
3603          * the GTT land before any writes to the device, such as updates to
3604          * the GATT itself.
3605          */
3606         wmb();
3607
3608         old_write_domain = obj->base.write_domain;
3609         obj->base.write_domain = 0;
3610
3611         intel_fb_obj_flush(obj, false);
3612
3613         trace_i915_gem_object_change_domain(obj,
3614                                             obj->base.read_domains,
3615                                             old_write_domain);
3616 }
3617
3618 /** Flushes the CPU write domain for the object if it's dirty. */
3619 static void
3620 i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj)
3621 {
3622         uint32_t old_write_domain;
3623
3624         if (obj->base.write_domain != I915_GEM_DOMAIN_CPU)
3625                 return;
3626
3627         if (i915_gem_clflush_object(obj, obj->pin_display))
3628                 i915_gem_chipset_flush(obj->base.dev);
3629
3630         old_write_domain = obj->base.write_domain;
3631         obj->base.write_domain = 0;
3632
3633         intel_fb_obj_flush(obj, false);
3634
3635         trace_i915_gem_object_change_domain(obj,
3636                                             obj->base.read_domains,
3637                                             old_write_domain);
3638 }
3639
3640 /**
3641  * Moves a single object to the GTT read, and possibly write domain.
3642  *
3643  * This function returns when the move is complete, including waiting on
3644  * flushes to occur.
3645  */
3646 int
3647 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
3648 {
3649         uint32_t old_write_domain, old_read_domains;
3650         struct i915_vma *vma;
3651         int ret;
3652
3653         if (obj->base.write_domain == I915_GEM_DOMAIN_GTT)
3654                 return 0;
3655
3656         ret = i915_gem_object_wait_rendering(obj, !write);
3657         if (ret)
3658                 return ret;
3659
3660         i915_gem_object_retire(obj);
3661
3662         /* Flush and acquire obj->pages so that we are coherent through
3663          * direct access in memory with previous cached writes through
3664          * shmemfs and that our cache domain tracking remains valid.
3665          * For example, if the obj->filp was moved to swap without us
3666          * being notified and releasing the pages, we would mistakenly
3667          * continue to assume that the obj remained out of the CPU cached
3668          * domain.
3669          */
3670         ret = i915_gem_object_get_pages(obj);
3671         if (ret)
3672                 return ret;
3673
3674         i915_gem_object_flush_cpu_write_domain(obj);
3675
3676         /* Serialise direct access to this object with the barriers for
3677          * coherent writes from the GPU, by effectively invalidating the
3678          * GTT domain upon first access.
3679          */
3680         if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
3681                 mb();
3682
3683         old_write_domain = obj->base.write_domain;
3684         old_read_domains = obj->base.read_domains;
3685
3686         /* It should now be out of any other write domains, and we can update
3687          * the domain values for our changes.
3688          */
3689         BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
3690         obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3691         if (write) {
3692                 obj->base.read_domains = I915_GEM_DOMAIN_GTT;
3693                 obj->base.write_domain = I915_GEM_DOMAIN_GTT;
3694                 obj->dirty = 1;
3695         }
3696
3697         if (write)
3698                 intel_fb_obj_invalidate(obj, NULL, ORIGIN_GTT);
3699
3700         trace_i915_gem_object_change_domain(obj,
3701                                             old_read_domains,
3702                                             old_write_domain);
3703
3704         /* And bump the LRU for this access */
3705         vma = i915_gem_obj_to_ggtt(obj);
3706         if (vma && drm_mm_node_allocated(&vma->node) && !obj->active)
3707                 list_move_tail(&vma->mm_list,
3708                                &to_i915(obj->base.dev)->gtt.base.inactive_list);
3709
3710         return 0;
3711 }
3712
3713 int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
3714                                     enum i915_cache_level cache_level)
3715 {
3716         struct drm_device *dev = obj->base.dev;
3717         struct i915_vma *vma, *next;
3718         int ret;
3719
3720         if (obj->cache_level == cache_level)
3721                 return 0;
3722
3723         if (i915_gem_obj_is_pinned(obj)) {
3724                 DRM_DEBUG("can not change the cache level of pinned objects\n");
3725                 return -EBUSY;
3726         }
3727
3728         list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link) {
3729                 if (!i915_gem_valid_gtt_space(vma, cache_level)) {
3730                         ret = i915_vma_unbind(vma);
3731                         if (ret)
3732                                 return ret;
3733                 }
3734         }
3735
3736         if (i915_gem_obj_bound_any(obj)) {
3737                 ret = i915_gem_object_finish_gpu(obj);
3738                 if (ret)
3739                         return ret;
3740
3741                 i915_gem_object_finish_gtt(obj);
3742
3743                 /* Before SandyBridge, you could not use tiling or fence
3744                  * registers with snooped memory, so relinquish any fences
3745                  * currently pointing to our region in the aperture.
3746                  */
3747                 if (INTEL_INFO(dev)->gen < 6) {
3748                         ret = i915_gem_object_put_fence(obj);
3749                         if (ret)
3750                                 return ret;
3751                 }
3752
3753                 list_for_each_entry(vma, &obj->vma_list, vma_link)
3754                         if (drm_mm_node_allocated(&vma->node)) {
3755                                 ret = i915_vma_bind(vma, cache_level,
3756                                                     vma->bound & GLOBAL_BIND);
3757                                 if (ret)
3758                                         return ret;
3759                         }
3760         }
3761
3762         list_for_each_entry(vma, &obj->vma_list, vma_link)
3763                 vma->node.color = cache_level;
3764         obj->cache_level = cache_level;
3765
3766         if (obj->cache_dirty &&
3767             obj->base.write_domain != I915_GEM_DOMAIN_CPU &&
3768             cpu_write_needs_clflush(obj)) {
3769                 if (i915_gem_clflush_object(obj, true))
3770                         i915_gem_chipset_flush(obj->base.dev);
3771         }
3772
3773         return 0;
3774 }
3775
3776 int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
3777                                struct drm_file *file)
3778 {
3779         struct drm_i915_gem_caching *args = data;
3780         struct drm_i915_gem_object *obj;
3781         int ret;
3782
3783         ret = i915_mutex_lock_interruptible(dev);
3784         if (ret)
3785                 return ret;
3786
3787         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3788         if (&obj->base == NULL) {
3789                 ret = -ENOENT;
3790                 goto unlock;
3791         }
3792
3793         switch (obj->cache_level) {
3794         case I915_CACHE_LLC:
3795         case I915_CACHE_L3_LLC:
3796                 args->caching = I915_CACHING_CACHED;
3797                 break;
3798
3799         case I915_CACHE_WT:
3800                 args->caching = I915_CACHING_DISPLAY;
3801                 break;
3802
3803         default:
3804                 args->caching = I915_CACHING_NONE;
3805                 break;
3806         }
3807
3808         drm_gem_object_unreference(&obj->base);
3809 unlock:
3810         mutex_unlock(&dev->struct_mutex);
3811         return ret;
3812 }
3813
3814 int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
3815                                struct drm_file *file)
3816 {
3817         struct drm_i915_gem_caching *args = data;
3818         struct drm_i915_gem_object *obj;
3819         enum i915_cache_level level;
3820         int ret;
3821
3822         switch (args->caching) {
3823         case I915_CACHING_NONE:
3824                 level = I915_CACHE_NONE;
3825                 break;
3826         case I915_CACHING_CACHED:
3827                 level = I915_CACHE_LLC;
3828                 break;
3829         case I915_CACHING_DISPLAY:
3830                 level = HAS_WT(dev) ? I915_CACHE_WT : I915_CACHE_NONE;
3831                 break;
3832         default:
3833                 return -EINVAL;
3834         }
3835
3836         ret = i915_mutex_lock_interruptible(dev);
3837         if (ret)
3838                 return ret;
3839
3840         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3841         if (&obj->base == NULL) {
3842                 ret = -ENOENT;
3843                 goto unlock;
3844         }
3845
3846         ret = i915_gem_object_set_cache_level(obj, level);
3847
3848         drm_gem_object_unreference(&obj->base);
3849 unlock:
3850         mutex_unlock(&dev->struct_mutex);
3851         return ret;
3852 }
3853
3854 static bool is_pin_display(struct drm_i915_gem_object *obj)
3855 {
3856         struct i915_vma *vma;
3857
3858         vma = i915_gem_obj_to_ggtt(obj);
3859         if (!vma)
3860                 return false;
3861
3862         /* There are 2 sources that pin objects:
3863          *   1. The display engine (scanouts, sprites, cursors);
3864          *   2. Reservations for execbuffer;
3865          *
3866          * We can ignore reservations as we hold the struct_mutex and
3867          * are only called outside of the reservation path.
3868          */
3869         return vma->pin_count;
3870 }
3871
3872 /*
3873  * Prepare buffer for display plane (scanout, cursors, etc).
3874  * Can be called from an uninterruptible phase (modesetting) and allows
3875  * any flushes to be pipelined (for pageflips).
3876  */
3877 int
3878 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
3879                                      u32 alignment,
3880                                      struct intel_engine_cs *pipelined,
3881                                      const struct i915_ggtt_view *view)
3882 {
3883         u32 old_read_domains, old_write_domain;
3884         bool was_pin_display;
3885         int ret;
3886
3887         if (pipelined != i915_gem_request_get_ring(obj->last_read_req)) {
3888                 ret = i915_gem_object_sync(obj, pipelined);
3889                 if (ret)
3890                         return ret;
3891         }
3892
3893         /* Mark the pin_display early so that we account for the
3894          * display coherency whilst setting up the cache domains.
3895          */
3896         was_pin_display = obj->pin_display;
3897         obj->pin_display = true;
3898
3899         /* The display engine is not coherent with the LLC cache on gen6.  As
3900          * a result, we make sure that the pinning that is about to occur is
3901          * done with uncached PTEs. This is lowest common denominator for all
3902          * chipsets.
3903          *
3904          * However for gen6+, we could do better by using the GFDT bit instead
3905          * of uncaching, which would allow us to flush all the LLC-cached data
3906          * with that bit in the PTE to main memory with just one PIPE_CONTROL.
3907          */
3908         ret = i915_gem_object_set_cache_level(obj,
3909                                               HAS_WT(obj->base.dev) ? I915_CACHE_WT : I915_CACHE_NONE);
3910         if (ret)
3911                 goto err_unpin_display;
3912
3913         /* As the user may map the buffer once pinned in the display plane
3914          * (e.g. libkms for the bootup splash), we have to ensure that we
3915          * always use map_and_fenceable for all scanout buffers.
3916          */
3917         ret = i915_gem_object_ggtt_pin(obj, view, alignment,
3918                                        view->type == I915_GGTT_VIEW_NORMAL ?
3919                                        PIN_MAPPABLE : 0);
3920         if (ret)
3921                 goto err_unpin_display;
3922
3923         i915_gem_object_flush_cpu_write_domain(obj);
3924
3925         old_write_domain = obj->base.write_domain;
3926         old_read_domains = obj->base.read_domains;
3927
3928         /* It should now be out of any other write domains, and we can update
3929          * the domain values for our changes.
3930          */
3931         obj->base.write_domain = 0;
3932         obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3933
3934         trace_i915_gem_object_change_domain(obj,
3935                                             old_read_domains,
3936                                             old_write_domain);
3937
3938         return 0;
3939
3940 err_unpin_display:
3941         WARN_ON(was_pin_display != is_pin_display(obj));
3942         obj->pin_display = was_pin_display;
3943         return ret;
3944 }
3945
3946 void
3947 i915_gem_object_unpin_from_display_plane(struct drm_i915_gem_object *obj,
3948                                          const struct i915_ggtt_view *view)
3949 {
3950         i915_gem_object_ggtt_unpin_view(obj, view);
3951
3952         obj->pin_display = is_pin_display(obj);
3953 }
3954
3955 int
3956 i915_gem_object_finish_gpu(struct drm_i915_gem_object *obj)
3957 {
3958         int ret;
3959
3960         if ((obj->base.read_domains & I915_GEM_GPU_DOMAINS) == 0)
3961                 return 0;
3962
3963         ret = i915_gem_object_wait_rendering(obj, false);
3964         if (ret)
3965                 return ret;
3966
3967         /* Ensure that we invalidate the GPU's caches and TLBs. */
3968         obj->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
3969         return 0;
3970 }
3971
3972 /**
3973  * Moves a single object to the CPU read, and possibly write domain.
3974  *
3975  * This function returns when the move is complete, including waiting on
3976  * flushes to occur.
3977  */
3978 int
3979 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
3980 {
3981         uint32_t old_write_domain, old_read_domains;
3982         int ret;
3983
3984         if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
3985                 return 0;
3986
3987         ret = i915_gem_object_wait_rendering(obj, !write);
3988         if (ret)
3989                 return ret;
3990
3991         i915_gem_object_retire(obj);
3992         i915_gem_object_flush_gtt_write_domain(obj);
3993
3994         old_write_domain = obj->base.write_domain;
3995         old_read_domains = obj->base.read_domains;
3996
3997         /* Flush the CPU cache if it's still invalid. */
3998         if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) {
3999                 i915_gem_clflush_object(obj, false);
4000
4001                 obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
4002         }
4003
4004         /* It should now be out of any other write domains, and we can update
4005          * the domain values for our changes.
4006          */
4007         BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
4008
4009         /* If we're writing through the CPU, then the GPU read domains will
4010          * need to be invalidated at next use.
4011          */
4012         if (write) {
4013                 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4014                 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4015         }
4016
4017         if (write)
4018                 intel_fb_obj_invalidate(obj, NULL, ORIGIN_CPU);
4019
4020         trace_i915_gem_object_change_domain(obj,
4021                                             old_read_domains,
4022                                             old_write_domain);
4023
4024         return 0;
4025 }
4026
4027 /* Throttle our rendering by waiting until the ring has completed our requests
4028  * emitted over 20 msec ago.
4029  *
4030  * Note that if we were to use the current jiffies each time around the loop,
4031  * we wouldn't escape the function with any frames outstanding if the time to
4032  * render a frame was over 20ms.
4033  *
4034  * This should get us reasonable parallelism between CPU and GPU but also
4035  * relatively low latency when blocking on a particular request to finish.
4036  */
4037 static int
4038 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
4039 {
4040         struct drm_i915_private *dev_priv = dev->dev_private;
4041         struct drm_i915_file_private *file_priv = file->driver_priv;
4042         unsigned long recent_enough = jiffies - msecs_to_jiffies(20);
4043         struct drm_i915_gem_request *request, *target = NULL;
4044         unsigned reset_counter;
4045         int ret;
4046
4047         ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
4048         if (ret)
4049                 return ret;
4050
4051         ret = i915_gem_check_wedge(&dev_priv->gpu_error, false);
4052         if (ret)
4053                 return ret;
4054
4055         spin_lock(&file_priv->mm.lock);
4056         list_for_each_entry(request, &file_priv->mm.request_list, client_list) {
4057                 if (time_after_eq(request->emitted_jiffies, recent_enough))
4058                         break;
4059
4060                 target = request;
4061         }
4062         reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
4063         if (target)
4064                 i915_gem_request_reference(target);
4065         spin_unlock(&file_priv->mm.lock);
4066
4067         if (target == NULL)
4068                 return 0;
4069
4070         ret = __i915_wait_request(target, reset_counter, true, NULL, NULL);
4071         if (ret == 0)
4072                 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
4073
4074         mutex_lock(&dev->struct_mutex);
4075         i915_gem_request_unreference(target);
4076         mutex_unlock(&dev->struct_mutex);
4077
4078         return ret;
4079 }
4080
4081 static bool
4082 i915_vma_misplaced(struct i915_vma *vma, uint32_t alignment, uint64_t flags)
4083 {
4084         struct drm_i915_gem_object *obj = vma->obj;
4085
4086         if (alignment &&
4087             vma->node.start & (alignment - 1))
4088                 return true;
4089
4090         if (flags & PIN_MAPPABLE && !obj->map_and_fenceable)
4091                 return true;
4092
4093         if (flags & PIN_OFFSET_BIAS &&
4094             vma->node.start < (flags & PIN_OFFSET_MASK))
4095                 return true;
4096
4097         return false;
4098 }
4099
4100 static int
4101 i915_gem_object_do_pin(struct drm_i915_gem_object *obj,
4102                        struct i915_address_space *vm,
4103                        const struct i915_ggtt_view *ggtt_view,
4104                        uint32_t alignment,
4105                        uint64_t flags)
4106 {
4107         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
4108         struct i915_vma *vma;
4109         unsigned bound;
4110         int ret;
4111
4112         if (WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base))
4113                 return -ENODEV;
4114
4115         if (WARN_ON(flags & (PIN_GLOBAL | PIN_MAPPABLE) && !i915_is_ggtt(vm)))
4116                 return -EINVAL;
4117
4118         if (WARN_ON((flags & (PIN_MAPPABLE | PIN_GLOBAL)) == PIN_MAPPABLE))
4119                 return -EINVAL;
4120
4121         if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
4122                 return -EINVAL;
4123
4124         vma = ggtt_view ? i915_gem_obj_to_ggtt_view(obj, ggtt_view) :
4125                           i915_gem_obj_to_vma(obj, vm);
4126
4127         if (IS_ERR(vma))
4128                 return PTR_ERR(vma);
4129
4130         if (vma) {
4131                 if (WARN_ON(vma->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT))
4132                         return -EBUSY;
4133
4134                 if (i915_vma_misplaced(vma, alignment, flags)) {
4135                         unsigned long offset;
4136                         offset = ggtt_view ? i915_gem_obj_ggtt_offset_view(obj, ggtt_view) :
4137                                              i915_gem_obj_offset(obj, vm);
4138                         WARN(vma->pin_count,
4139                              "bo is already pinned in %s with incorrect alignment:"
4140                              " offset=%lx, req.alignment=%x, req.map_and_fenceable=%d,"
4141                              " obj->map_and_fenceable=%d\n",
4142                              ggtt_view ? "ggtt" : "ppgtt",
4143                              offset,
4144                              alignment,
4145                              !!(flags & PIN_MAPPABLE),
4146                              obj->map_and_fenceable);
4147                         ret = i915_vma_unbind(vma);
4148                         if (ret)
4149                                 return ret;
4150
4151                         vma = NULL;
4152                 }
4153         }
4154
4155         bound = vma ? vma->bound : 0;
4156         if (vma == NULL || !drm_mm_node_allocated(&vma->node)) {
4157                 /* In true PPGTT, bind has possibly changed PDEs, which
4158                  * means we must do a context switch before the GPU can
4159                  * accurately read some of the VMAs.
4160                  */
4161                 vma = i915_gem_object_bind_to_vm(obj, vm, ggtt_view, alignment,
4162                                                  flags);
4163                 if (IS_ERR(vma))
4164                         return PTR_ERR(vma);
4165         }
4166
4167         if (flags & PIN_GLOBAL && !(vma->bound & GLOBAL_BIND)) {
4168                 ret = i915_vma_bind(vma, obj->cache_level, GLOBAL_BIND);
4169                 if (ret)
4170                         return ret;
4171         }
4172
4173         if ((bound ^ vma->bound) & GLOBAL_BIND) {
4174                 bool mappable, fenceable;
4175                 u32 fence_size, fence_alignment;
4176
4177                 fence_size = i915_gem_get_gtt_size(obj->base.dev,
4178                                                    obj->base.size,
4179                                                    obj->tiling_mode);
4180                 fence_alignment = i915_gem_get_gtt_alignment(obj->base.dev,
4181                                                              obj->base.size,
4182                                                              obj->tiling_mode,
4183                                                              true);
4184
4185                 fenceable = (vma->node.size == fence_size &&
4186                              (vma->node.start & (fence_alignment - 1)) == 0);
4187
4188                 mappable = (vma->node.start + fence_size <=
4189                             dev_priv->gtt.mappable_end);
4190
4191                 obj->map_and_fenceable = mappable && fenceable;
4192         }
4193
4194         WARN_ON(flags & PIN_MAPPABLE && !obj->map_and_fenceable);
4195
4196         vma->pin_count++;
4197         if (flags & PIN_MAPPABLE)
4198                 obj->pin_mappable |= true;
4199
4200         return 0;
4201 }
4202
4203 int
4204 i915_gem_object_pin(struct drm_i915_gem_object *obj,
4205                     struct i915_address_space *vm,
4206                     uint32_t alignment,
4207                     uint64_t flags)
4208 {
4209         return i915_gem_object_do_pin(obj, vm,
4210                                       i915_is_ggtt(vm) ? &i915_ggtt_view_normal : NULL,
4211                                       alignment, flags);
4212 }
4213
4214 int
4215 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
4216                          const struct i915_ggtt_view *view,
4217                          uint32_t alignment,
4218                          uint64_t flags)
4219 {
4220         if (WARN_ONCE(!view, "no view specified"))
4221                 return -EINVAL;
4222
4223         return i915_gem_object_do_pin(obj, i915_obj_to_ggtt(obj), view,
4224                                       alignment, flags | PIN_GLOBAL);
4225 }
4226
4227 void
4228 i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj,
4229                                 const struct i915_ggtt_view *view)
4230 {
4231         struct i915_vma *vma = i915_gem_obj_to_ggtt_view(obj, view);
4232
4233         BUG_ON(!vma);
4234         WARN_ON(vma->pin_count == 0);
4235         WARN_ON(!i915_gem_obj_ggtt_bound_view(obj, view));
4236
4237         if (--vma->pin_count == 0 && view->type == I915_GGTT_VIEW_NORMAL)
4238                 obj->pin_mappable = false;
4239 }
4240
4241 bool
4242 i915_gem_object_pin_fence(struct drm_i915_gem_object *obj)
4243 {
4244         if (obj->fence_reg != I915_FENCE_REG_NONE) {
4245                 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
4246                 struct i915_vma *ggtt_vma = i915_gem_obj_to_ggtt(obj);
4247
4248                 WARN_ON(!ggtt_vma ||
4249                         dev_priv->fence_regs[obj->fence_reg].pin_count >
4250                         ggtt_vma->pin_count);
4251                 dev_priv->fence_regs[obj->fence_reg].pin_count++;
4252                 return true;
4253         } else
4254                 return false;
4255 }
4256
4257 void
4258 i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj)
4259 {
4260         if (obj->fence_reg != I915_FENCE_REG_NONE) {
4261                 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
4262                 WARN_ON(dev_priv->fence_regs[obj->fence_reg].pin_count <= 0);
4263                 dev_priv->fence_regs[obj->fence_reg].pin_count--;
4264         }
4265 }
4266
4267 int
4268 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
4269                     struct drm_file *file)
4270 {
4271         struct drm_i915_gem_busy *args = data;
4272         struct drm_i915_gem_object *obj;
4273         int ret;
4274
4275         ret = i915_mutex_lock_interruptible(dev);
4276         if (ret)
4277                 return ret;
4278
4279         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
4280         if (&obj->base == NULL) {
4281                 ret = -ENOENT;
4282                 goto unlock;
4283         }
4284
4285         /* Count all active objects as busy, even if they are currently not used
4286          * by the gpu. Users of this interface expect objects to eventually
4287          * become non-busy without any further actions, therefore emit any
4288          * necessary flushes here.
4289          */
4290         ret = i915_gem_object_flush_active(obj);
4291
4292         args->busy = obj->active;
4293         if (obj->last_read_req) {
4294                 struct intel_engine_cs *ring;
4295                 BUILD_BUG_ON(I915_NUM_RINGS > 16);
4296                 ring = i915_gem_request_get_ring(obj->last_read_req);
4297                 args->busy |= intel_ring_flag(ring) << 16;
4298         }
4299
4300         drm_gem_object_unreference(&obj->base);
4301 unlock:
4302         mutex_unlock(&dev->struct_mutex);
4303         return ret;
4304 }
4305
4306 int
4307 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
4308                         struct drm_file *file_priv)
4309 {
4310         return i915_gem_ring_throttle(dev, file_priv);
4311 }
4312
4313 int
4314 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
4315                        struct drm_file *file_priv)
4316 {
4317         struct drm_i915_private *dev_priv = dev->dev_private;
4318         struct drm_i915_gem_madvise *args = data;
4319         struct drm_i915_gem_object *obj;
4320         int ret;
4321
4322         switch (args->madv) {
4323         case I915_MADV_DONTNEED:
4324         case I915_MADV_WILLNEED:
4325             break;
4326         default:
4327             return -EINVAL;
4328         }
4329
4330         ret = i915_mutex_lock_interruptible(dev);
4331         if (ret)
4332                 return ret;
4333
4334         obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle));
4335         if (&obj->base == NULL) {
4336                 ret = -ENOENT;
4337                 goto unlock;
4338         }
4339
4340         if (i915_gem_obj_is_pinned(obj)) {
4341                 ret = -EINVAL;
4342                 goto out;
4343         }
4344
4345         if (obj->pages &&
4346             obj->tiling_mode != I915_TILING_NONE &&
4347             dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
4348                 if (obj->madv == I915_MADV_WILLNEED)
4349                         i915_gem_object_unpin_pages(obj);
4350                 if (args->madv == I915_MADV_WILLNEED)
4351                         i915_gem_object_pin_pages(obj);
4352         }
4353
4354         if (obj->madv != __I915_MADV_PURGED)
4355                 obj->madv = args->madv;
4356
4357         /* if the object is no longer attached, discard its backing storage */
4358         if (obj->madv == I915_MADV_DONTNEED && obj->pages == NULL)
4359                 i915_gem_object_truncate(obj);
4360
4361         args->retained = obj->madv != __I915_MADV_PURGED;
4362
4363 out:
4364         drm_gem_object_unreference(&obj->base);
4365 unlock:
4366         mutex_unlock(&dev->struct_mutex);
4367         return ret;
4368 }
4369
4370 void i915_gem_object_init(struct drm_i915_gem_object *obj,
4371                           const struct drm_i915_gem_object_ops *ops)
4372 {
4373         INIT_LIST_HEAD(&obj->global_list);
4374         INIT_LIST_HEAD(&obj->ring_list);
4375         INIT_LIST_HEAD(&obj->obj_exec_link);
4376         INIT_LIST_HEAD(&obj->vma_list);
4377         INIT_LIST_HEAD(&obj->batch_pool_list);
4378
4379         obj->ops = ops;
4380
4381         obj->fence_reg = I915_FENCE_REG_NONE;
4382         obj->madv = I915_MADV_WILLNEED;
4383
4384         i915_gem_info_add_obj(obj->base.dev->dev_private, obj->base.size);
4385 }
4386
4387 static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
4388         .get_pages = i915_gem_object_get_pages_gtt,
4389         .put_pages = i915_gem_object_put_pages_gtt,
4390 };
4391
4392 struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
4393                                                   size_t size)
4394 {
4395         struct drm_i915_gem_object *obj;
4396         struct address_space *mapping;
4397         gfp_t mask;
4398
4399         obj = i915_gem_object_alloc(dev);
4400         if (obj == NULL)
4401                 return NULL;
4402
4403         if (drm_gem_object_init(dev, &obj->base, size) != 0) {
4404                 i915_gem_object_free(obj);
4405                 return NULL;
4406         }
4407
4408         mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
4409         if (IS_CRESTLINE(dev) || IS_BROADWATER(dev)) {
4410                 /* 965gm cannot relocate objects above 4GiB. */
4411                 mask &= ~__GFP_HIGHMEM;
4412                 mask |= __GFP_DMA32;
4413         }
4414
4415         mapping = file_inode(obj->base.filp)->i_mapping;
4416         mapping_set_gfp_mask(mapping, mask);
4417
4418         i915_gem_object_init(obj, &i915_gem_object_ops);
4419
4420         obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4421         obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4422
4423         if (HAS_LLC(dev)) {
4424                 /* On some devices, we can have the GPU use the LLC (the CPU
4425                  * cache) for about a 10% performance improvement
4426                  * compared to uncached.  Graphics requests other than
4427                  * display scanout are coherent with the CPU in
4428                  * accessing this cache.  This means in this mode we
4429                  * don't need to clflush on the CPU side, and on the
4430                  * GPU side we only need to flush internal caches to
4431                  * get data visible to the CPU.
4432                  *
4433                  * However, we maintain the display planes as UC, and so
4434                  * need to rebind when first used as such.
4435                  */
4436                 obj->cache_level = I915_CACHE_LLC;
4437         } else
4438                 obj->cache_level = I915_CACHE_NONE;
4439
4440         trace_i915_gem_object_create(obj);
4441
4442         return obj;
4443 }
4444
4445 static bool discard_backing_storage(struct drm_i915_gem_object *obj)
4446 {
4447         /* If we are the last user of the backing storage (be it shmemfs
4448          * pages or stolen etc), we know that the pages are going to be
4449          * immediately released. In this case, we can then skip copying
4450          * back the contents from the GPU.
4451          */
4452
4453         if (obj->madv != I915_MADV_WILLNEED)
4454                 return false;
4455
4456         if (obj->base.filp == NULL)
4457                 return true;
4458
4459         /* At first glance, this looks racy, but then again so would be
4460          * userspace racing mmap against close. However, the first external
4461          * reference to the filp can only be obtained through the
4462          * i915_gem_mmap_ioctl() which safeguards us against the user
4463          * acquiring such a reference whilst we are in the middle of
4464          * freeing the object.
4465          */
4466         return atomic_long_read(&obj->base.filp->f_count) == 1;
4467 }
4468
4469 void i915_gem_free_object(struct drm_gem_object *gem_obj)
4470 {
4471         struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
4472         struct drm_device *dev = obj->base.dev;
4473         struct drm_i915_private *dev_priv = dev->dev_private;
4474         struct i915_vma *vma, *next;
4475
4476         intel_runtime_pm_get(dev_priv);
4477
4478         trace_i915_gem_object_destroy(obj);
4479
4480         list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link) {
4481                 int ret;
4482
4483                 vma->pin_count = 0;
4484                 ret = i915_vma_unbind(vma);
4485                 if (WARN_ON(ret == -ERESTARTSYS)) {
4486                         bool was_interruptible;
4487
4488                         was_interruptible = dev_priv->mm.interruptible;
4489                         dev_priv->mm.interruptible = false;
4490
4491                         WARN_ON(i915_vma_unbind(vma));
4492
4493                         dev_priv->mm.interruptible = was_interruptible;
4494                 }
4495         }
4496
4497         /* Stolen objects don't hold a ref, but do hold pin count. Fix that up
4498          * before progressing. */
4499         if (obj->stolen)
4500                 i915_gem_object_unpin_pages(obj);
4501
4502         WARN_ON(obj->frontbuffer_bits);
4503
4504         if (obj->pages && obj->madv == I915_MADV_WILLNEED &&
4505             dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES &&
4506             obj->tiling_mode != I915_TILING_NONE)
4507                 i915_gem_object_unpin_pages(obj);
4508
4509         if (WARN_ON(obj->pages_pin_count))
4510                 obj->pages_pin_count = 0;
4511         if (discard_backing_storage(obj))
4512                 obj->madv = I915_MADV_DONTNEED;
4513         i915_gem_object_put_pages(obj);
4514         i915_gem_object_free_mmap_offset(obj);
4515
4516         BUG_ON(obj->pages);
4517
4518         if (obj->base.import_attach)
4519                 drm_prime_gem_destroy(&obj->base, NULL);
4520
4521         if (obj->ops->release)
4522                 obj->ops->release(obj);
4523
4524         drm_gem_object_release(&obj->base);
4525         i915_gem_info_remove_obj(dev_priv, obj->base.size);
4526
4527         kfree(obj->bit_17);
4528         i915_gem_object_free(obj);
4529
4530         intel_runtime_pm_put(dev_priv);
4531 }
4532
4533 struct i915_vma *i915_gem_obj_to_vma(struct drm_i915_gem_object *obj,
4534                                      struct i915_address_space *vm)
4535 {
4536         struct i915_vma *vma;
4537         list_for_each_entry(vma, &obj->vma_list, vma_link) {
4538                 if (i915_is_ggtt(vma->vm) &&
4539                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
4540                         continue;
4541                 if (vma->vm == vm)
4542                         return vma;
4543         }
4544         return NULL;
4545 }
4546
4547 struct i915_vma *i915_gem_obj_to_ggtt_view(struct drm_i915_gem_object *obj,
4548                                            const struct i915_ggtt_view *view)
4549 {
4550         struct i915_address_space *ggtt = i915_obj_to_ggtt(obj);
4551         struct i915_vma *vma;
4552
4553         if (WARN_ONCE(!view, "no view specified"))
4554                 return ERR_PTR(-EINVAL);
4555
4556         list_for_each_entry(vma, &obj->vma_list, vma_link)
4557                 if (vma->vm == ggtt &&
4558                     i915_ggtt_view_equal(&vma->ggtt_view, view))
4559                         return vma;
4560         return NULL;
4561 }
4562
4563 void i915_gem_vma_destroy(struct i915_vma *vma)
4564 {
4565         struct i915_address_space *vm = NULL;
4566         WARN_ON(vma->node.allocated);
4567
4568         /* Keep the vma as a placeholder in the execbuffer reservation lists */
4569         if (!list_empty(&vma->exec_list))
4570                 return;
4571
4572         vm = vma->vm;
4573
4574         if (!i915_is_ggtt(vm))
4575                 i915_ppgtt_put(i915_vm_to_ppgtt(vm));
4576
4577         list_del(&vma->vma_link);
4578
4579         kfree(vma);
4580 }
4581
4582 static void
4583 i915_gem_stop_ringbuffers(struct drm_device *dev)
4584 {
4585         struct drm_i915_private *dev_priv = dev->dev_private;
4586         struct intel_engine_cs *ring;
4587         int i;
4588
4589         for_each_ring(ring, dev_priv, i)
4590                 dev_priv->gt.stop_ring(ring);
4591 }
4592
4593 int
4594 i915_gem_suspend(struct drm_device *dev)
4595 {
4596         struct drm_i915_private *dev_priv = dev->dev_private;
4597         int ret = 0;
4598
4599         mutex_lock(&dev->struct_mutex);
4600         ret = i915_gpu_idle(dev);
4601         if (ret)
4602                 goto err;
4603
4604         i915_gem_retire_requests(dev);
4605
4606         i915_gem_stop_ringbuffers(dev);
4607         mutex_unlock(&dev->struct_mutex);
4608
4609         cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
4610         cancel_delayed_work_sync(&dev_priv->mm.retire_work);
4611         flush_delayed_work(&dev_priv->mm.idle_work);
4612
4613         /* Assert that we sucessfully flushed all the work and
4614          * reset the GPU back to its idle, low power state.
4615          */
4616         WARN_ON(dev_priv->mm.busy);
4617
4618         return 0;
4619
4620 err:
4621         mutex_unlock(&dev->struct_mutex);
4622         return ret;
4623 }
4624
4625 int i915_gem_l3_remap(struct intel_engine_cs *ring, int slice)
4626 {
4627         struct drm_device *dev = ring->dev;
4628         struct drm_i915_private *dev_priv = dev->dev_private;
4629         u32 reg_base = GEN7_L3LOG_BASE + (slice * 0x200);
4630         u32 *remap_info = dev_priv->l3_parity.remap_info[slice];
4631         int i, ret;
4632
4633         if (!HAS_L3_DPF(dev) || !remap_info)
4634                 return 0;
4635
4636         ret = intel_ring_begin(ring, GEN7_L3LOG_SIZE / 4 * 3);
4637         if (ret)
4638                 return ret;
4639
4640         /*
4641          * Note: We do not worry about the concurrent register cacheline hang
4642          * here because no other code should access these registers other than
4643          * at initialization time.
4644          */
4645         for (i = 0; i < GEN7_L3LOG_SIZE; i += 4) {
4646                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
4647                 intel_ring_emit(ring, reg_base + i);
4648                 intel_ring_emit(ring, remap_info[i/4]);
4649         }
4650
4651         intel_ring_advance(ring);
4652
4653         return ret;
4654 }
4655
4656 void i915_gem_init_swizzling(struct drm_device *dev)
4657 {
4658         struct drm_i915_private *dev_priv = dev->dev_private;
4659
4660         if (INTEL_INFO(dev)->gen < 5 ||
4661             dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
4662                 return;
4663
4664         I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
4665                                  DISP_TILE_SURFACE_SWIZZLING);
4666
4667         if (IS_GEN5(dev))
4668                 return;
4669
4670         I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
4671         if (IS_GEN6(dev))
4672                 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
4673         else if (IS_GEN7(dev))
4674                 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
4675         else if (IS_GEN8(dev))
4676                 I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));
4677         else
4678                 BUG();
4679 }
4680
4681 static bool
4682 intel_enable_blt(struct drm_device *dev)
4683 {
4684         if (!HAS_BLT(dev))
4685                 return false;
4686
4687         /* The blitter was dysfunctional on early prototypes */
4688         if (IS_GEN6(dev) && dev->pdev->revision < 8) {
4689                 DRM_INFO("BLT not supported on this pre-production hardware;"
4690                          " graphics performance will be degraded.\n");
4691                 return false;
4692         }
4693
4694         return true;
4695 }
4696
4697 static void init_unused_ring(struct drm_device *dev, u32 base)
4698 {
4699         struct drm_i915_private *dev_priv = dev->dev_private;
4700
4701         I915_WRITE(RING_CTL(base), 0);
4702         I915_WRITE(RING_HEAD(base), 0);
4703         I915_WRITE(RING_TAIL(base), 0);
4704         I915_WRITE(RING_START(base), 0);
4705 }
4706
4707 static void init_unused_rings(struct drm_device *dev)
4708 {
4709         if (IS_I830(dev)) {
4710                 init_unused_ring(dev, PRB1_BASE);
4711                 init_unused_ring(dev, SRB0_BASE);
4712                 init_unused_ring(dev, SRB1_BASE);
4713                 init_unused_ring(dev, SRB2_BASE);
4714                 init_unused_ring(dev, SRB3_BASE);
4715         } else if (IS_GEN2(dev)) {
4716                 init_unused_ring(dev, SRB0_BASE);
4717                 init_unused_ring(dev, SRB1_BASE);
4718         } else if (IS_GEN3(dev)) {
4719                 init_unused_ring(dev, PRB1_BASE);
4720                 init_unused_ring(dev, PRB2_BASE);
4721         }
4722 }
4723
4724 int i915_gem_init_rings(struct drm_device *dev)
4725 {
4726         struct drm_i915_private *dev_priv = dev->dev_private;
4727         int ret;
4728
4729         ret = intel_init_render_ring_buffer(dev);
4730         if (ret)
4731                 return ret;
4732
4733         if (HAS_BSD(dev)) {
4734                 ret = intel_init_bsd_ring_buffer(dev);
4735                 if (ret)
4736                         goto cleanup_render_ring;
4737         }
4738
4739         if (intel_enable_blt(dev)) {
4740                 ret = intel_init_blt_ring_buffer(dev);
4741                 if (ret)
4742                         goto cleanup_bsd_ring;
4743         }
4744
4745         if (HAS_VEBOX(dev)) {
4746                 ret = intel_init_vebox_ring_buffer(dev);
4747                 if (ret)
4748                         goto cleanup_blt_ring;
4749         }
4750
4751         if (HAS_BSD2(dev)) {
4752                 ret = intel_init_bsd2_ring_buffer(dev);
4753                 if (ret)
4754                         goto cleanup_vebox_ring;
4755         }
4756
4757         ret = i915_gem_set_seqno(dev, ((u32)~0 - 0x1000));
4758         if (ret)
4759                 goto cleanup_bsd2_ring;
4760
4761         return 0;
4762
4763 cleanup_bsd2_ring:
4764         intel_cleanup_ring_buffer(&dev_priv->ring[VCS2]);
4765 cleanup_vebox_ring:
4766         intel_cleanup_ring_buffer(&dev_priv->ring[VECS]);
4767 cleanup_blt_ring:
4768         intel_cleanup_ring_buffer(&dev_priv->ring[BCS]);
4769 cleanup_bsd_ring:
4770         intel_cleanup_ring_buffer(&dev_priv->ring[VCS]);
4771 cleanup_render_ring:
4772         intel_cleanup_ring_buffer(&dev_priv->ring[RCS]);
4773
4774         return ret;
4775 }
4776
4777 int
4778 i915_gem_init_hw(struct drm_device *dev)
4779 {
4780         struct drm_i915_private *dev_priv = dev->dev_private;
4781         struct intel_engine_cs *ring;
4782         int ret, i;
4783
4784         if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
4785                 return -EIO;
4786
4787         /* Double layer security blanket, see i915_gem_init() */
4788         intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
4789
4790         if (dev_priv->ellc_size)
4791                 I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf));
4792
4793         if (IS_HASWELL(dev))
4794                 I915_WRITE(MI_PREDICATE_RESULT_2, IS_HSW_GT3(dev) ?
4795                            LOWER_SLICE_ENABLED : LOWER_SLICE_DISABLED);
4796
4797         if (HAS_PCH_NOP(dev)) {
4798                 if (IS_IVYBRIDGE(dev)) {
4799                         u32 temp = I915_READ(GEN7_MSG_CTL);
4800                         temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
4801                         I915_WRITE(GEN7_MSG_CTL, temp);
4802                 } else if (INTEL_INFO(dev)->gen >= 7) {
4803                         u32 temp = I915_READ(HSW_NDE_RSTWRN_OPT);
4804                         temp &= ~RESET_PCH_HANDSHAKE_ENABLE;
4805                         I915_WRITE(HSW_NDE_RSTWRN_OPT, temp);
4806                 }
4807         }
4808
4809         i915_gem_init_swizzling(dev);
4810
4811         /*
4812          * At least 830 can leave some of the unused rings
4813          * "active" (ie. head != tail) after resume which
4814          * will prevent c3 entry. Makes sure all unused rings
4815          * are totally idle.
4816          */
4817         init_unused_rings(dev);
4818
4819         for_each_ring(ring, dev_priv, i) {
4820                 ret = ring->init_hw(ring);
4821                 if (ret)
4822                         goto out;
4823         }
4824
4825         for (i = 0; i < NUM_L3_SLICES(dev); i++)
4826                 i915_gem_l3_remap(&dev_priv->ring[RCS], i);
4827
4828         ret = i915_ppgtt_init_hw(dev);
4829         if (ret && ret != -EIO) {
4830                 DRM_ERROR("PPGTT enable failed %d\n", ret);
4831                 i915_gem_cleanup_ringbuffer(dev);
4832         }
4833
4834         ret = i915_gem_context_enable(dev_priv);
4835         if (ret && ret != -EIO) {
4836                 DRM_ERROR("Context enable failed %d\n", ret);
4837                 i915_gem_cleanup_ringbuffer(dev);
4838
4839                 goto out;
4840         }
4841
4842 out:
4843         intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
4844         return ret;
4845 }
4846
4847 int i915_gem_init(struct drm_device *dev)
4848 {
4849         struct drm_i915_private *dev_priv = dev->dev_private;
4850         int ret;
4851
4852         i915.enable_execlists = intel_sanitize_enable_execlists(dev,
4853                         i915.enable_execlists);
4854
4855         mutex_lock(&dev->struct_mutex);
4856
4857         if (IS_VALLEYVIEW(dev)) {
4858                 /* VLVA0 (potential hack), BIOS isn't actually waking us */
4859                 I915_WRITE(VLV_GTLC_WAKE_CTRL, VLV_GTLC_ALLOWWAKEREQ);
4860                 if (wait_for((I915_READ(VLV_GTLC_PW_STATUS) &
4861                               VLV_GTLC_ALLOWWAKEACK), 10))
4862                         DRM_DEBUG_DRIVER("allow wake ack timed out\n");
4863         }
4864
4865         if (!i915.enable_execlists) {
4866                 dev_priv->gt.do_execbuf = i915_gem_ringbuffer_submission;
4867                 dev_priv->gt.init_rings = i915_gem_init_rings;
4868                 dev_priv->gt.cleanup_ring = intel_cleanup_ring_buffer;
4869                 dev_priv->gt.stop_ring = intel_stop_ring_buffer;
4870         } else {
4871                 dev_priv->gt.do_execbuf = intel_execlists_submission;
4872                 dev_priv->gt.init_rings = intel_logical_rings_init;
4873                 dev_priv->gt.cleanup_ring = intel_logical_ring_cleanup;
4874                 dev_priv->gt.stop_ring = intel_logical_ring_stop;
4875         }
4876
4877         /* This is just a security blanket to placate dragons.
4878          * On some systems, we very sporadically observe that the first TLBs
4879          * used by the CS may be stale, despite us poking the TLB reset. If
4880          * we hold the forcewake during initialisation these problems
4881          * just magically go away.
4882          */
4883         intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
4884
4885         ret = i915_gem_init_userptr(dev);
4886         if (ret)
4887                 goto out_unlock;
4888
4889         i915_gem_init_global_gtt(dev);
4890
4891         ret = i915_gem_context_init(dev);
4892         if (ret)
4893                 goto out_unlock;
4894
4895         ret = dev_priv->gt.init_rings(dev);
4896         if (ret)
4897                 goto out_unlock;
4898
4899         ret = i915_gem_init_hw(dev);
4900         if (ret == -EIO) {
4901                 /* Allow ring initialisation to fail by marking the GPU as
4902                  * wedged. But we only want to do this where the GPU is angry,
4903                  * for all other failure, such as an allocation failure, bail.
4904                  */
4905                 DRM_ERROR("Failed to initialize GPU, declaring it wedged\n");
4906                 atomic_set_mask(I915_WEDGED, &dev_priv->gpu_error.reset_counter);
4907                 ret = 0;
4908         }
4909
4910 out_unlock:
4911         intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
4912         mutex_unlock(&dev->struct_mutex);
4913
4914         return ret;
4915 }
4916
4917 void
4918 i915_gem_cleanup_ringbuffer(struct drm_device *dev)
4919 {
4920         struct drm_i915_private *dev_priv = dev->dev_private;
4921         struct intel_engine_cs *ring;
4922         int i;
4923
4924         for_each_ring(ring, dev_priv, i)
4925                 dev_priv->gt.cleanup_ring(ring);
4926 }
4927
4928 static void
4929 init_ring_lists(struct intel_engine_cs *ring)
4930 {
4931         INIT_LIST_HEAD(&ring->active_list);
4932         INIT_LIST_HEAD(&ring->request_list);
4933 }
4934
4935 void i915_init_vm(struct drm_i915_private *dev_priv,
4936                   struct i915_address_space *vm)
4937 {
4938         if (!i915_is_ggtt(vm))
4939                 drm_mm_init(&vm->mm, vm->start, vm->total);
4940         vm->dev = dev_priv->dev;
4941         INIT_LIST_HEAD(&vm->active_list);
4942         INIT_LIST_HEAD(&vm->inactive_list);
4943         INIT_LIST_HEAD(&vm->global_link);
4944         list_add_tail(&vm->global_link, &dev_priv->vm_list);
4945 }
4946
4947 void
4948 i915_gem_load(struct drm_device *dev)
4949 {
4950         struct drm_i915_private *dev_priv = dev->dev_private;
4951         int i;
4952
4953         dev_priv->slab =
4954                 kmem_cache_create("i915_gem_object",
4955                                   sizeof(struct drm_i915_gem_object), 0,
4956                                   SLAB_HWCACHE_ALIGN,
4957                                   NULL);
4958
4959         INIT_LIST_HEAD(&dev_priv->vm_list);
4960         i915_init_vm(dev_priv, &dev_priv->gtt.base);
4961
4962         INIT_LIST_HEAD(&dev_priv->context_list);
4963         INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
4964         INIT_LIST_HEAD(&dev_priv->mm.bound_list);
4965         INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4966         for (i = 0; i < I915_NUM_RINGS; i++)
4967                 init_ring_lists(&dev_priv->ring[i]);
4968         for (i = 0; i < I915_MAX_NUM_FENCES; i++)
4969                 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
4970         INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
4971                           i915_gem_retire_work_handler);
4972         INIT_DELAYED_WORK(&dev_priv->mm.idle_work,
4973                           i915_gem_idle_work_handler);
4974         init_waitqueue_head(&dev_priv->gpu_error.reset_queue);
4975
4976         dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL;
4977
4978         if (INTEL_INFO(dev)->gen >= 7 && !IS_VALLEYVIEW(dev))
4979                 dev_priv->num_fence_regs = 32;
4980         else if (INTEL_INFO(dev)->gen >= 4 || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
4981                 dev_priv->num_fence_regs = 16;
4982         else
4983                 dev_priv->num_fence_regs = 8;
4984
4985         if (intel_vgpu_active(dev))
4986                 dev_priv->num_fence_regs =
4987                                 I915_READ(vgtif_reg(avail_rs.fence_num));
4988
4989         /* Initialize fence registers to zero */
4990         INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4991         i915_gem_restore_fences(dev);
4992
4993         i915_gem_detect_bit_6_swizzle(dev);
4994         init_waitqueue_head(&dev_priv->pending_flip_queue);
4995
4996         dev_priv->mm.interruptible = true;
4997
4998         i915_gem_shrinker_init(dev_priv);
4999
5000         i915_gem_batch_pool_init(dev, &dev_priv->mm.batch_pool);
5001
5002         mutex_init(&dev_priv->fb_tracking.lock);
5003 }
5004
5005 void i915_gem_release(struct drm_device *dev, struct drm_file *file)
5006 {
5007         struct drm_i915_file_private *file_priv = file->driver_priv;
5008
5009         cancel_delayed_work_sync(&file_priv->mm.idle_work);
5010
5011         /* Clean up our request list when the client is going away, so that
5012          * later retire_requests won't dereference our soon-to-be-gone
5013          * file_priv.
5014          */
5015         spin_lock(&file_priv->mm.lock);
5016         while (!list_empty(&file_priv->mm.request_list)) {
5017                 struct drm_i915_gem_request *request;
5018
5019                 request = list_first_entry(&file_priv->mm.request_list,
5020                                            struct drm_i915_gem_request,
5021                                            client_list);
5022                 list_del(&request->client_list);
5023                 request->file_priv = NULL;
5024         }
5025         spin_unlock(&file_priv->mm.lock);
5026 }
5027
5028 static void
5029 i915_gem_file_idle_work_handler(struct work_struct *work)
5030 {
5031         struct drm_i915_file_private *file_priv =
5032                 container_of(work, typeof(*file_priv), mm.idle_work.work);
5033
5034         atomic_set(&file_priv->rps_wait_boost, false);
5035 }
5036
5037 int i915_gem_open(struct drm_device *dev, struct drm_file *file)
5038 {
5039         struct drm_i915_file_private *file_priv;
5040         int ret;
5041
5042         DRM_DEBUG_DRIVER("\n");
5043
5044         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
5045         if (!file_priv)
5046                 return -ENOMEM;
5047
5048         file->driver_priv = file_priv;
5049         file_priv->dev_priv = dev->dev_private;
5050         file_priv->file = file;
5051
5052         spin_lock_init(&file_priv->mm.lock);
5053         INIT_LIST_HEAD(&file_priv->mm.request_list);
5054         INIT_DELAYED_WORK(&file_priv->mm.idle_work,
5055                           i915_gem_file_idle_work_handler);
5056
5057         ret = i915_gem_context_open(dev, file);
5058         if (ret)
5059                 kfree(file_priv);
5060
5061         return ret;
5062 }
5063
5064 /**
5065  * i915_gem_track_fb - update frontbuffer tracking
5066  * old: current GEM buffer for the frontbuffer slots
5067  * new: new GEM buffer for the frontbuffer slots
5068  * frontbuffer_bits: bitmask of frontbuffer slots
5069  *
5070  * This updates the frontbuffer tracking bits @frontbuffer_bits by clearing them
5071  * from @old and setting them in @new. Both @old and @new can be NULL.
5072  */
5073 void i915_gem_track_fb(struct drm_i915_gem_object *old,
5074                        struct drm_i915_gem_object *new,
5075                        unsigned frontbuffer_bits)
5076 {
5077         if (old) {
5078                 WARN_ON(!mutex_is_locked(&old->base.dev->struct_mutex));
5079                 WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits));
5080                 old->frontbuffer_bits &= ~frontbuffer_bits;
5081         }
5082
5083         if (new) {
5084                 WARN_ON(!mutex_is_locked(&new->base.dev->struct_mutex));
5085                 WARN_ON(new->frontbuffer_bits & frontbuffer_bits);
5086                 new->frontbuffer_bits |= frontbuffer_bits;
5087         }
5088 }
5089
5090 /* All the new VM stuff */
5091 unsigned long
5092 i915_gem_obj_offset(struct drm_i915_gem_object *o,
5093                     struct i915_address_space *vm)
5094 {
5095         struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5096         struct i915_vma *vma;
5097
5098         WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base);
5099
5100         list_for_each_entry(vma, &o->vma_list, vma_link) {
5101                 if (i915_is_ggtt(vma->vm) &&
5102                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5103                         continue;
5104                 if (vma->vm == vm)
5105                         return vma->node.start;
5106         }
5107
5108         WARN(1, "%s vma for this object not found.\n",
5109              i915_is_ggtt(vm) ? "global" : "ppgtt");
5110         return -1;
5111 }
5112
5113 unsigned long
5114 i915_gem_obj_ggtt_offset_view(struct drm_i915_gem_object *o,
5115                               const struct i915_ggtt_view *view)
5116 {
5117         struct i915_address_space *ggtt = i915_obj_to_ggtt(o);
5118         struct i915_vma *vma;
5119
5120         list_for_each_entry(vma, &o->vma_list, vma_link)
5121                 if (vma->vm == ggtt &&
5122                     i915_ggtt_view_equal(&vma->ggtt_view, view))
5123                         return vma->node.start;
5124
5125         WARN(1, "global vma for this object not found.\n");
5126         return -1;
5127 }
5128
5129 bool i915_gem_obj_bound(struct drm_i915_gem_object *o,
5130                         struct i915_address_space *vm)
5131 {
5132         struct i915_vma *vma;
5133
5134         list_for_each_entry(vma, &o->vma_list, vma_link) {
5135                 if (i915_is_ggtt(vma->vm) &&
5136                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5137                         continue;
5138                 if (vma->vm == vm && drm_mm_node_allocated(&vma->node))
5139                         return true;
5140         }
5141
5142         return false;
5143 }
5144
5145 bool i915_gem_obj_ggtt_bound_view(struct drm_i915_gem_object *o,
5146                                   const struct i915_ggtt_view *view)
5147 {
5148         struct i915_address_space *ggtt = i915_obj_to_ggtt(o);
5149         struct i915_vma *vma;
5150
5151         list_for_each_entry(vma, &o->vma_list, vma_link)
5152                 if (vma->vm == ggtt &&
5153                     i915_ggtt_view_equal(&vma->ggtt_view, view) &&
5154                     drm_mm_node_allocated(&vma->node))
5155                         return true;
5156
5157         return false;
5158 }
5159
5160 bool i915_gem_obj_bound_any(struct drm_i915_gem_object *o)
5161 {
5162         struct i915_vma *vma;
5163
5164         list_for_each_entry(vma, &o->vma_list, vma_link)
5165                 if (drm_mm_node_allocated(&vma->node))
5166                         return true;
5167
5168         return false;
5169 }
5170
5171 unsigned long i915_gem_obj_size(struct drm_i915_gem_object *o,
5172                                 struct i915_address_space *vm)
5173 {
5174         struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5175         struct i915_vma *vma;
5176
5177         WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base);
5178
5179         BUG_ON(list_empty(&o->vma_list));
5180
5181         list_for_each_entry(vma, &o->vma_list, vma_link) {
5182                 if (i915_is_ggtt(vma->vm) &&
5183                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5184                         continue;
5185                 if (vma->vm == vm)
5186                         return vma->node.size;
5187         }
5188         return 0;
5189 }
5190
5191 bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj)
5192 {
5193         struct i915_vma *vma;
5194         list_for_each_entry(vma, &obj->vma_list, vma_link) {
5195                 if (i915_is_ggtt(vma->vm) &&
5196                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5197                         continue;
5198                 if (vma->pin_count > 0)
5199                         return true;
5200         }
5201         return false;
5202 }
5203