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                 request->tail = intel_ring_get_tail(ringbuf);
2382         }
2383
2384         request->head = request_start;
2385
2386         /* Whilst this request exists, batch_obj will be on the
2387          * active_list, and so will hold the active reference. Only when this
2388          * request is retired will the the batch_obj be moved onto the
2389          * inactive_list and lose its active reference. Hence we do not need
2390          * to explicitly hold another reference here.
2391          */
2392         request->batch_obj = obj;
2393
2394         if (!i915.enable_execlists) {
2395                 /* Hold a reference to the current context so that we can inspect
2396                  * it later in case a hangcheck error event fires.
2397                  */
2398                 request->ctx = ring->last_context;
2399                 if (request->ctx)
2400                         i915_gem_context_reference(request->ctx);
2401         }
2402
2403         request->emitted_jiffies = jiffies;
2404         list_add_tail(&request->list, &ring->request_list);
2405         request->file_priv = NULL;
2406
2407         if (file) {
2408                 struct drm_i915_file_private *file_priv = file->driver_priv;
2409
2410                 spin_lock(&file_priv->mm.lock);
2411                 request->file_priv = file_priv;
2412                 list_add_tail(&request->client_list,
2413                               &file_priv->mm.request_list);
2414                 spin_unlock(&file_priv->mm.lock);
2415
2416                 request->pid = get_pid(task_pid(current));
2417         }
2418
2419         trace_i915_gem_request_add(request);
2420         ring->outstanding_lazy_request = NULL;
2421
2422         i915_queue_hangcheck(ring->dev);
2423
2424         cancel_delayed_work_sync(&dev_priv->mm.idle_work);
2425         queue_delayed_work(dev_priv->wq,
2426                            &dev_priv->mm.retire_work,
2427                            round_jiffies_up_relative(HZ));
2428         intel_mark_busy(dev_priv->dev);
2429
2430         return 0;
2431 }
2432
2433 static inline void
2434 i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
2435 {
2436         struct drm_i915_file_private *file_priv = request->file_priv;
2437
2438         if (!file_priv)
2439                 return;
2440
2441         spin_lock(&file_priv->mm.lock);
2442         list_del(&request->client_list);
2443         request->file_priv = NULL;
2444         spin_unlock(&file_priv->mm.lock);
2445 }
2446
2447 static bool i915_context_is_banned(struct drm_i915_private *dev_priv,
2448                                    const struct intel_context *ctx)
2449 {
2450         unsigned long elapsed;
2451
2452         elapsed = get_seconds() - ctx->hang_stats.guilty_ts;
2453
2454         if (ctx->hang_stats.banned)
2455                 return true;
2456
2457         if (ctx->hang_stats.ban_period_seconds &&
2458             elapsed <= ctx->hang_stats.ban_period_seconds) {
2459                 if (!i915_gem_context_is_default(ctx)) {
2460                         DRM_DEBUG("context hanging too fast, banning!\n");
2461                         return true;
2462                 } else if (i915_stop_ring_allow_ban(dev_priv)) {
2463                         if (i915_stop_ring_allow_warn(dev_priv))
2464                                 DRM_ERROR("gpu hanging too fast, banning!\n");
2465                         return true;
2466                 }
2467         }
2468
2469         return false;
2470 }
2471
2472 static void i915_set_reset_status(struct drm_i915_private *dev_priv,
2473                                   struct intel_context *ctx,
2474                                   const bool guilty)
2475 {
2476         struct i915_ctx_hang_stats *hs;
2477
2478         if (WARN_ON(!ctx))
2479                 return;
2480
2481         hs = &ctx->hang_stats;
2482
2483         if (guilty) {
2484                 hs->banned = i915_context_is_banned(dev_priv, ctx);
2485                 hs->batch_active++;
2486                 hs->guilty_ts = get_seconds();
2487         } else {
2488                 hs->batch_pending++;
2489         }
2490 }
2491
2492 static void i915_gem_free_request(struct drm_i915_gem_request *request)
2493 {
2494         list_del(&request->list);
2495         i915_gem_request_remove_from_client(request);
2496
2497         put_pid(request->pid);
2498
2499         i915_gem_request_unreference(request);
2500 }
2501
2502 void i915_gem_request_free(struct kref *req_ref)
2503 {
2504         struct drm_i915_gem_request *req = container_of(req_ref,
2505                                                  typeof(*req), ref);
2506         struct intel_context *ctx = req->ctx;
2507
2508         if (ctx) {
2509                 if (i915.enable_execlists) {
2510                         struct intel_engine_cs *ring = req->ring;
2511
2512                         if (ctx != ring->default_context)
2513                                 intel_lr_context_unpin(ring, ctx);
2514                 }
2515
2516                 i915_gem_context_unreference(ctx);
2517         }
2518
2519         kfree(req);
2520 }
2521
2522 struct drm_i915_gem_request *
2523 i915_gem_find_active_request(struct intel_engine_cs *ring)
2524 {
2525         struct drm_i915_gem_request *request;
2526
2527         list_for_each_entry(request, &ring->request_list, list) {
2528                 if (i915_gem_request_completed(request, false))
2529                         continue;
2530
2531                 return request;
2532         }
2533
2534         return NULL;
2535 }
2536
2537 static void i915_gem_reset_ring_status(struct drm_i915_private *dev_priv,
2538                                        struct intel_engine_cs *ring)
2539 {
2540         struct drm_i915_gem_request *request;
2541         bool ring_hung;
2542
2543         request = i915_gem_find_active_request(ring);
2544
2545         if (request == NULL)
2546                 return;
2547
2548         ring_hung = ring->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG;
2549
2550         i915_set_reset_status(dev_priv, request->ctx, ring_hung);
2551
2552         list_for_each_entry_continue(request, &ring->request_list, list)
2553                 i915_set_reset_status(dev_priv, request->ctx, false);
2554 }
2555
2556 static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
2557                                         struct intel_engine_cs *ring)
2558 {
2559         while (!list_empty(&ring->active_list)) {
2560                 struct drm_i915_gem_object *obj;
2561
2562                 obj = list_first_entry(&ring->active_list,
2563                                        struct drm_i915_gem_object,
2564                                        ring_list);
2565
2566                 i915_gem_object_move_to_inactive(obj);
2567         }
2568
2569         /*
2570          * Clear the execlists queue up before freeing the requests, as those
2571          * are the ones that keep the context and ringbuffer backing objects
2572          * pinned in place.
2573          */
2574         while (!list_empty(&ring->execlist_queue)) {
2575                 struct drm_i915_gem_request *submit_req;
2576
2577                 submit_req = list_first_entry(&ring->execlist_queue,
2578                                 struct drm_i915_gem_request,
2579                                 execlist_link);
2580                 list_del(&submit_req->execlist_link);
2581                 intel_runtime_pm_put(dev_priv);
2582
2583                 if (submit_req->ctx != ring->default_context)
2584                         intel_lr_context_unpin(ring, submit_req->ctx);
2585
2586                 i915_gem_request_unreference(submit_req);
2587         }
2588
2589         /*
2590          * We must free the requests after all the corresponding objects have
2591          * been moved off active lists. Which is the same order as the normal
2592          * retire_requests function does. This is important if object hold
2593          * implicit references on things like e.g. ppgtt address spaces through
2594          * the request.
2595          */
2596         while (!list_empty(&ring->request_list)) {
2597                 struct drm_i915_gem_request *request;
2598
2599                 request = list_first_entry(&ring->request_list,
2600                                            struct drm_i915_gem_request,
2601                                            list);
2602
2603                 i915_gem_free_request(request);
2604         }
2605
2606         /* This may not have been flushed before the reset, so clean it now */
2607         i915_gem_request_assign(&ring->outstanding_lazy_request, NULL);
2608 }
2609
2610 void i915_gem_restore_fences(struct drm_device *dev)
2611 {
2612         struct drm_i915_private *dev_priv = dev->dev_private;
2613         int i;
2614
2615         for (i = 0; i < dev_priv->num_fence_regs; i++) {
2616                 struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
2617
2618                 /*
2619                  * Commit delayed tiling changes if we have an object still
2620                  * attached to the fence, otherwise just clear the fence.
2621                  */
2622                 if (reg->obj) {
2623                         i915_gem_object_update_fence(reg->obj, reg,
2624                                                      reg->obj->tiling_mode);
2625                 } else {
2626                         i915_gem_write_fence(dev, i, NULL);
2627                 }
2628         }
2629 }
2630
2631 void i915_gem_reset(struct drm_device *dev)
2632 {
2633         struct drm_i915_private *dev_priv = dev->dev_private;
2634         struct intel_engine_cs *ring;
2635         int i;
2636
2637         /*
2638          * Before we free the objects from the requests, we need to inspect
2639          * them for finding the guilty party. As the requests only borrow
2640          * their reference to the objects, the inspection must be done first.
2641          */
2642         for_each_ring(ring, dev_priv, i)
2643                 i915_gem_reset_ring_status(dev_priv, ring);
2644
2645         for_each_ring(ring, dev_priv, i)
2646                 i915_gem_reset_ring_cleanup(dev_priv, ring);
2647
2648         i915_gem_context_reset(dev);
2649
2650         i915_gem_restore_fences(dev);
2651 }
2652
2653 /**
2654  * This function clears the request list as sequence numbers are passed.
2655  */
2656 void
2657 i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
2658 {
2659         WARN_ON(i915_verify_lists(ring->dev));
2660
2661         /* Retire requests first as we use it above for the early return.
2662          * If we retire requests last, we may use a later seqno and so clear
2663          * the requests lists without clearing the active list, leading to
2664          * confusion.
2665          */
2666         while (!list_empty(&ring->request_list)) {
2667                 struct drm_i915_gem_request *request;
2668
2669                 request = list_first_entry(&ring->request_list,
2670                                            struct drm_i915_gem_request,
2671                                            list);
2672
2673                 if (!i915_gem_request_completed(request, true))
2674                         break;
2675
2676                 trace_i915_gem_request_retire(request);
2677
2678                 /* We know the GPU must have read the request to have
2679                  * sent us the seqno + interrupt, so use the position
2680                  * of tail of the request to update the last known position
2681                  * of the GPU head.
2682                  */
2683                 request->ringbuf->last_retired_head = request->postfix;
2684
2685                 i915_gem_free_request(request);
2686         }
2687
2688         /* Move any buffers on the active list that are no longer referenced
2689          * by the ringbuffer to the flushing/inactive lists as appropriate,
2690          * before we free the context associated with the requests.
2691          */
2692         while (!list_empty(&ring->active_list)) {
2693                 struct drm_i915_gem_object *obj;
2694
2695                 obj = list_first_entry(&ring->active_list,
2696                                       struct drm_i915_gem_object,
2697                                       ring_list);
2698
2699                 if (!i915_gem_request_completed(obj->last_read_req, true))
2700                         break;
2701
2702                 i915_gem_object_move_to_inactive(obj);
2703         }
2704
2705         if (unlikely(ring->trace_irq_req &&
2706                      i915_gem_request_completed(ring->trace_irq_req, true))) {
2707                 ring->irq_put(ring);
2708                 i915_gem_request_assign(&ring->trace_irq_req, NULL);
2709         }
2710
2711         WARN_ON(i915_verify_lists(ring->dev));
2712 }
2713
2714 bool
2715 i915_gem_retire_requests(struct drm_device *dev)
2716 {
2717         struct drm_i915_private *dev_priv = dev->dev_private;
2718         struct intel_engine_cs *ring;
2719         bool idle = true;
2720         int i;
2721
2722         for_each_ring(ring, dev_priv, i) {
2723                 i915_gem_retire_requests_ring(ring);
2724                 idle &= list_empty(&ring->request_list);
2725                 if (i915.enable_execlists) {
2726                         unsigned long flags;
2727
2728                         spin_lock_irqsave(&ring->execlist_lock, flags);
2729                         idle &= list_empty(&ring->execlist_queue);
2730                         spin_unlock_irqrestore(&ring->execlist_lock, flags);
2731
2732                         intel_execlists_retire_requests(ring);
2733                 }
2734         }
2735
2736         if (idle)
2737                 mod_delayed_work(dev_priv->wq,
2738                                    &dev_priv->mm.idle_work,
2739                                    msecs_to_jiffies(100));
2740
2741         return idle;
2742 }
2743
2744 static void
2745 i915_gem_retire_work_handler(struct work_struct *work)
2746 {
2747         struct drm_i915_private *dev_priv =
2748                 container_of(work, typeof(*dev_priv), mm.retire_work.work);
2749         struct drm_device *dev = dev_priv->dev;
2750         bool idle;
2751
2752         /* Come back later if the device is busy... */
2753         idle = false;
2754         if (mutex_trylock(&dev->struct_mutex)) {
2755                 idle = i915_gem_retire_requests(dev);
2756                 mutex_unlock(&dev->struct_mutex);
2757         }
2758         if (!idle)
2759                 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work,
2760                                    round_jiffies_up_relative(HZ));
2761 }
2762
2763 static void
2764 i915_gem_idle_work_handler(struct work_struct *work)
2765 {
2766         struct drm_i915_private *dev_priv =
2767                 container_of(work, typeof(*dev_priv), mm.idle_work.work);
2768
2769         intel_mark_idle(dev_priv->dev);
2770 }
2771
2772 /**
2773  * Ensures that an object will eventually get non-busy by flushing any required
2774  * write domains, emitting any outstanding lazy request and retiring and
2775  * completed requests.
2776  */
2777 static int
2778 i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
2779 {
2780         struct intel_engine_cs *ring;
2781         int ret;
2782
2783         if (obj->active) {
2784                 ring = i915_gem_request_get_ring(obj->last_read_req);
2785
2786                 ret = i915_gem_check_olr(obj->last_read_req);
2787                 if (ret)
2788                         return ret;
2789
2790                 i915_gem_retire_requests_ring(ring);
2791         }
2792
2793         return 0;
2794 }
2795
2796 /**
2797  * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
2798  * @DRM_IOCTL_ARGS: standard ioctl arguments
2799  *
2800  * Returns 0 if successful, else an error is returned with the remaining time in
2801  * the timeout parameter.
2802  *  -ETIME: object is still busy after timeout
2803  *  -ERESTARTSYS: signal interrupted the wait
2804  *  -ENONENT: object doesn't exist
2805  * Also possible, but rare:
2806  *  -EAGAIN: GPU wedged
2807  *  -ENOMEM: damn
2808  *  -ENODEV: Internal IRQ fail
2809  *  -E?: The add request failed
2810  *
2811  * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any
2812  * non-zero timeout parameter the wait ioctl will wait for the given number of
2813  * nanoseconds on an object becoming unbusy. Since the wait itself does so
2814  * without holding struct_mutex the object may become re-busied before this
2815  * function completes. A similar but shorter * race condition exists in the busy
2816  * ioctl
2817  */
2818 int
2819 i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
2820 {
2821         struct drm_i915_private *dev_priv = dev->dev_private;
2822         struct drm_i915_gem_wait *args = data;
2823         struct drm_i915_gem_object *obj;
2824         struct drm_i915_gem_request *req;
2825         unsigned reset_counter;
2826         int ret = 0;
2827
2828         if (args->flags != 0)
2829                 return -EINVAL;
2830
2831         ret = i915_mutex_lock_interruptible(dev);
2832         if (ret)
2833                 return ret;
2834
2835         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->bo_handle));
2836         if (&obj->base == NULL) {
2837                 mutex_unlock(&dev->struct_mutex);
2838                 return -ENOENT;
2839         }
2840
2841         /* Need to make sure the object gets inactive eventually. */
2842         ret = i915_gem_object_flush_active(obj);
2843         if (ret)
2844                 goto out;
2845
2846         if (!obj->active || !obj->last_read_req)
2847                 goto out;
2848
2849         req = obj->last_read_req;
2850
2851         /* Do this after OLR check to make sure we make forward progress polling
2852          * on this IOCTL with a timeout == 0 (like busy ioctl)
2853          */
2854         if (args->timeout_ns == 0) {
2855                 ret = -ETIME;
2856                 goto out;
2857         }
2858
2859         drm_gem_object_unreference(&obj->base);
2860         reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
2861         i915_gem_request_reference(req);
2862         mutex_unlock(&dev->struct_mutex);
2863
2864         ret = __i915_wait_request(req, reset_counter, true,
2865                                   args->timeout_ns > 0 ? &args->timeout_ns : NULL,
2866                                   file->driver_priv);
2867         mutex_lock(&dev->struct_mutex);
2868         i915_gem_request_unreference(req);
2869         mutex_unlock(&dev->struct_mutex);
2870         return ret;
2871
2872 out:
2873         drm_gem_object_unreference(&obj->base);
2874         mutex_unlock(&dev->struct_mutex);
2875         return ret;
2876 }
2877
2878 /**
2879  * i915_gem_object_sync - sync an object to a ring.
2880  *
2881  * @obj: object which may be in use on another ring.
2882  * @to: ring we wish to use the object on. May be NULL.
2883  *
2884  * This code is meant to abstract object synchronization with the GPU.
2885  * Calling with NULL implies synchronizing the object with the CPU
2886  * rather than a particular GPU ring.
2887  *
2888  * Returns 0 if successful, else propagates up the lower layer error.
2889  */
2890 int
2891 i915_gem_object_sync(struct drm_i915_gem_object *obj,
2892                      struct intel_engine_cs *to)
2893 {
2894         struct intel_engine_cs *from;
2895         u32 seqno;
2896         int ret, idx;
2897
2898         from = i915_gem_request_get_ring(obj->last_read_req);
2899
2900         if (from == NULL || to == from)
2901                 return 0;
2902
2903         if (to == NULL || !i915_semaphore_is_enabled(obj->base.dev))
2904                 return i915_gem_object_wait_rendering(obj, false);
2905
2906         idx = intel_ring_sync_index(from, to);
2907
2908         seqno = i915_gem_request_get_seqno(obj->last_read_req);
2909         /* Optimization: Avoid semaphore sync when we are sure we already
2910          * waited for an object with higher seqno */
2911         if (seqno <= from->semaphore.sync_seqno[idx])
2912                 return 0;
2913
2914         ret = i915_gem_check_olr(obj->last_read_req);
2915         if (ret)
2916                 return ret;
2917
2918         trace_i915_gem_ring_sync_to(from, to, obj->last_read_req);
2919         ret = to->semaphore.sync_to(to, from, seqno);
2920         if (!ret)
2921                 /* We use last_read_req because sync_to()
2922                  * might have just caused seqno wrap under
2923                  * the radar.
2924                  */
2925                 from->semaphore.sync_seqno[idx] =
2926                                 i915_gem_request_get_seqno(obj->last_read_req);
2927
2928         return ret;
2929 }
2930
2931 static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
2932 {
2933         u32 old_write_domain, old_read_domains;
2934
2935         /* Force a pagefault for domain tracking on next user access */
2936         i915_gem_release_mmap(obj);
2937
2938         if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
2939                 return;
2940
2941         /* Wait for any direct GTT access to complete */
2942         mb();
2943
2944         old_read_domains = obj->base.read_domains;
2945         old_write_domain = obj->base.write_domain;
2946
2947         obj->base.read_domains &= ~I915_GEM_DOMAIN_GTT;
2948         obj->base.write_domain &= ~I915_GEM_DOMAIN_GTT;
2949
2950         trace_i915_gem_object_change_domain(obj,
2951                                             old_read_domains,
2952                                             old_write_domain);
2953 }
2954
2955 int i915_vma_unbind(struct i915_vma *vma)
2956 {
2957         struct drm_i915_gem_object *obj = vma->obj;
2958         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2959         int ret;
2960
2961         if (list_empty(&vma->vma_link))
2962                 return 0;
2963
2964         if (!drm_mm_node_allocated(&vma->node)) {
2965                 i915_gem_vma_destroy(vma);
2966                 return 0;
2967         }
2968
2969         if (vma->pin_count)
2970                 return -EBUSY;
2971
2972         BUG_ON(obj->pages == NULL);
2973
2974         ret = i915_gem_object_finish_gpu(obj);
2975         if (ret)
2976                 return ret;
2977         /* Continue on if we fail due to EIO, the GPU is hung so we
2978          * should be safe and we need to cleanup or else we might
2979          * cause memory corruption through use-after-free.
2980          */
2981
2982         if (i915_is_ggtt(vma->vm) &&
2983             vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
2984                 i915_gem_object_finish_gtt(obj);
2985
2986                 /* release the fence reg _after_ flushing */
2987                 ret = i915_gem_object_put_fence(obj);
2988                 if (ret)
2989                         return ret;
2990         }
2991
2992         trace_i915_vma_unbind(vma);
2993
2994         vma->unbind_vma(vma);
2995
2996         list_del_init(&vma->mm_list);
2997         if (i915_is_ggtt(vma->vm)) {
2998                 if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
2999                         obj->map_and_fenceable = false;
3000                 } else if (vma->ggtt_view.pages) {
3001                         sg_free_table(vma->ggtt_view.pages);
3002                         kfree(vma->ggtt_view.pages);
3003                         vma->ggtt_view.pages = NULL;
3004                 }
3005         }
3006
3007         drm_mm_remove_node(&vma->node);
3008         i915_gem_vma_destroy(vma);
3009
3010         /* Since the unbound list is global, only move to that list if
3011          * no more VMAs exist. */
3012         if (list_empty(&obj->vma_list)) {
3013                 /* Throw away the active reference before
3014                  * moving to the unbound list. */
3015                 i915_gem_object_retire(obj);
3016
3017                 i915_gem_gtt_finish_object(obj);
3018                 list_move_tail(&obj->global_list, &dev_priv->mm.unbound_list);
3019         }
3020
3021         /* And finally now the object is completely decoupled from this vma,
3022          * we can drop its hold on the backing storage and allow it to be
3023          * reaped by the shrinker.
3024          */
3025         i915_gem_object_unpin_pages(obj);
3026
3027         return 0;
3028 }
3029
3030 int i915_gpu_idle(struct drm_device *dev)
3031 {
3032         struct drm_i915_private *dev_priv = dev->dev_private;
3033         struct intel_engine_cs *ring;
3034         int ret, i;
3035
3036         /* Flush everything onto the inactive list. */
3037         for_each_ring(ring, dev_priv, i) {
3038                 if (!i915.enable_execlists) {
3039                         ret = i915_switch_context(ring, ring->default_context);
3040                         if (ret)
3041                                 return ret;
3042                 }
3043
3044                 ret = intel_ring_idle(ring);
3045                 if (ret)
3046                         return ret;
3047         }
3048
3049         return 0;
3050 }
3051
3052 static void i965_write_fence_reg(struct drm_device *dev, int reg,
3053                                  struct drm_i915_gem_object *obj)
3054 {
3055         struct drm_i915_private *dev_priv = dev->dev_private;
3056         int fence_reg;
3057         int fence_pitch_shift;
3058
3059         if (INTEL_INFO(dev)->gen >= 6) {
3060                 fence_reg = FENCE_REG_SANDYBRIDGE_0;
3061                 fence_pitch_shift = SANDYBRIDGE_FENCE_PITCH_SHIFT;
3062         } else {
3063                 fence_reg = FENCE_REG_965_0;
3064                 fence_pitch_shift = I965_FENCE_PITCH_SHIFT;
3065         }
3066
3067         fence_reg += reg * 8;
3068
3069         /* To w/a incoherency with non-atomic 64-bit register updates,
3070          * we split the 64-bit update into two 32-bit writes. In order
3071          * for a partial fence not to be evaluated between writes, we
3072          * precede the update with write to turn off the fence register,
3073          * and only enable the fence as the last step.
3074          *
3075          * For extra levels of paranoia, we make sure each step lands
3076          * before applying the next step.
3077          */
3078         I915_WRITE(fence_reg, 0);
3079         POSTING_READ(fence_reg);
3080
3081         if (obj) {
3082                 u32 size = i915_gem_obj_ggtt_size(obj);
3083                 uint64_t val;
3084
3085                 /* Adjust fence size to match tiled area */
3086                 if (obj->tiling_mode != I915_TILING_NONE) {
3087                         uint32_t row_size = obj->stride *
3088                                 (obj->tiling_mode == I915_TILING_Y ? 32 : 8);
3089                         size = (size / row_size) * row_size;
3090                 }
3091
3092                 val = (uint64_t)((i915_gem_obj_ggtt_offset(obj) + size - 4096) &
3093                                  0xfffff000) << 32;
3094                 val |= i915_gem_obj_ggtt_offset(obj) & 0xfffff000;
3095                 val |= (uint64_t)((obj->stride / 128) - 1) << fence_pitch_shift;
3096                 if (obj->tiling_mode == I915_TILING_Y)
3097                         val |= 1 << I965_FENCE_TILING_Y_SHIFT;
3098                 val |= I965_FENCE_REG_VALID;
3099
3100                 I915_WRITE(fence_reg + 4, val >> 32);
3101                 POSTING_READ(fence_reg + 4);
3102
3103                 I915_WRITE(fence_reg + 0, val);
3104                 POSTING_READ(fence_reg);
3105         } else {
3106                 I915_WRITE(fence_reg + 4, 0);
3107                 POSTING_READ(fence_reg + 4);
3108         }
3109 }
3110
3111 static void i915_write_fence_reg(struct drm_device *dev, int reg,
3112                                  struct drm_i915_gem_object *obj)
3113 {
3114         struct drm_i915_private *dev_priv = dev->dev_private;
3115         u32 val;
3116
3117         if (obj) {
3118                 u32 size = i915_gem_obj_ggtt_size(obj);
3119                 int pitch_val;
3120                 int tile_width;
3121
3122                 WARN((i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK) ||
3123                      (size & -size) != size ||
3124                      (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
3125                      "object 0x%08lx [fenceable? %d] not 1M or pot-size (0x%08x) aligned\n",
3126                      i915_gem_obj_ggtt_offset(obj), obj->map_and_fenceable, size);
3127
3128                 if (obj->tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
3129                         tile_width = 128;
3130                 else
3131                         tile_width = 512;
3132
3133                 /* Note: pitch better be a power of two tile widths */
3134                 pitch_val = obj->stride / tile_width;
3135                 pitch_val = ffs(pitch_val) - 1;
3136
3137                 val = i915_gem_obj_ggtt_offset(obj);
3138                 if (obj->tiling_mode == I915_TILING_Y)
3139                         val |= 1 << I830_FENCE_TILING_Y_SHIFT;
3140                 val |= I915_FENCE_SIZE_BITS(size);
3141                 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
3142                 val |= I830_FENCE_REG_VALID;
3143         } else
3144                 val = 0;
3145
3146         if (reg < 8)
3147                 reg = FENCE_REG_830_0 + reg * 4;
3148         else
3149                 reg = FENCE_REG_945_8 + (reg - 8) * 4;
3150
3151         I915_WRITE(reg, val);
3152         POSTING_READ(reg);
3153 }
3154
3155 static void i830_write_fence_reg(struct drm_device *dev, int reg,
3156                                 struct drm_i915_gem_object *obj)
3157 {
3158         struct drm_i915_private *dev_priv = dev->dev_private;
3159         uint32_t val;
3160
3161         if (obj) {
3162                 u32 size = i915_gem_obj_ggtt_size(obj);
3163                 uint32_t pitch_val;
3164
3165                 WARN((i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK) ||
3166                      (size & -size) != size ||
3167                      (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
3168                      "object 0x%08lx not 512K or pot-size 0x%08x aligned\n",
3169                      i915_gem_obj_ggtt_offset(obj), size);
3170
3171                 pitch_val = obj->stride / 128;
3172                 pitch_val = ffs(pitch_val) - 1;
3173
3174                 val = i915_gem_obj_ggtt_offset(obj);
3175                 if (obj->tiling_mode == I915_TILING_Y)
3176                         val |= 1 << I830_FENCE_TILING_Y_SHIFT;
3177                 val |= I830_FENCE_SIZE_BITS(size);
3178                 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
3179                 val |= I830_FENCE_REG_VALID;
3180         } else
3181                 val = 0;
3182
3183         I915_WRITE(FENCE_REG_830_0 + reg * 4, val);
3184         POSTING_READ(FENCE_REG_830_0 + reg * 4);
3185 }
3186
3187 inline static bool i915_gem_object_needs_mb(struct drm_i915_gem_object *obj)
3188 {
3189         return obj && obj->base.read_domains & I915_GEM_DOMAIN_GTT;
3190 }
3191
3192 static void i915_gem_write_fence(struct drm_device *dev, int reg,
3193                                  struct drm_i915_gem_object *obj)
3194 {
3195         struct drm_i915_private *dev_priv = dev->dev_private;
3196
3197         /* Ensure that all CPU reads are completed before installing a fence
3198          * and all writes before removing the fence.
3199          */
3200         if (i915_gem_object_needs_mb(dev_priv->fence_regs[reg].obj))
3201                 mb();
3202
3203         WARN(obj && (!obj->stride || !obj->tiling_mode),
3204              "bogus fence setup with stride: 0x%x, tiling mode: %i\n",
3205              obj->stride, obj->tiling_mode);
3206
3207         if (IS_GEN2(dev))
3208                 i830_write_fence_reg(dev, reg, obj);
3209         else if (IS_GEN3(dev))
3210                 i915_write_fence_reg(dev, reg, obj);
3211         else if (INTEL_INFO(dev)->gen >= 4)
3212                 i965_write_fence_reg(dev, reg, obj);
3213
3214         /* And similarly be paranoid that no direct access to this region
3215          * is reordered to before the fence is installed.
3216          */
3217         if (i915_gem_object_needs_mb(obj))
3218                 mb();
3219 }
3220
3221 static inline int fence_number(struct drm_i915_private *dev_priv,
3222                                struct drm_i915_fence_reg *fence)
3223 {
3224         return fence - dev_priv->fence_regs;
3225 }
3226
3227 static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
3228                                          struct drm_i915_fence_reg *fence,
3229                                          bool enable)
3230 {
3231         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
3232         int reg = fence_number(dev_priv, fence);
3233
3234         i915_gem_write_fence(obj->base.dev, reg, enable ? obj : NULL);
3235
3236         if (enable) {
3237                 obj->fence_reg = reg;
3238                 fence->obj = obj;
3239                 list_move_tail(&fence->lru_list, &dev_priv->mm.fence_list);
3240         } else {
3241                 obj->fence_reg = I915_FENCE_REG_NONE;
3242                 fence->obj = NULL;
3243                 list_del_init(&fence->lru_list);
3244         }
3245         obj->fence_dirty = false;
3246 }
3247
3248 static int
3249 i915_gem_object_wait_fence(struct drm_i915_gem_object *obj)
3250 {
3251         if (obj->last_fenced_req) {
3252                 int ret = i915_wait_request(obj->last_fenced_req);
3253                 if (ret)
3254                         return ret;
3255
3256                 i915_gem_request_assign(&obj->last_fenced_req, NULL);
3257         }
3258
3259         return 0;
3260 }
3261
3262 int
3263 i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
3264 {
3265         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
3266         struct drm_i915_fence_reg *fence;
3267         int ret;
3268
3269         ret = i915_gem_object_wait_fence(obj);
3270         if (ret)
3271                 return ret;
3272
3273         if (obj->fence_reg == I915_FENCE_REG_NONE)
3274                 return 0;
3275
3276         fence = &dev_priv->fence_regs[obj->fence_reg];
3277
3278         if (WARN_ON(fence->pin_count))
3279                 return -EBUSY;
3280
3281         i915_gem_object_fence_lost(obj);
3282         i915_gem_object_update_fence(obj, fence, false);
3283
3284         return 0;
3285 }
3286
3287 static struct drm_i915_fence_reg *
3288 i915_find_fence_reg(struct drm_device *dev)
3289 {
3290         struct drm_i915_private *dev_priv = dev->dev_private;
3291         struct drm_i915_fence_reg *reg, *avail;
3292         int i;
3293
3294         /* First try to find a free reg */
3295         avail = NULL;
3296         for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
3297                 reg = &dev_priv->fence_regs[i];
3298                 if (!reg->obj)
3299                         return reg;
3300
3301                 if (!reg->pin_count)
3302                         avail = reg;
3303         }
3304
3305         if (avail == NULL)
3306                 goto deadlock;
3307
3308         /* None available, try to steal one or wait for a user to finish */
3309         list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
3310                 if (reg->pin_count)
3311                         continue;
3312
3313                 return reg;
3314         }
3315
3316 deadlock:
3317         /* Wait for completion of pending flips which consume fences */
3318         if (intel_has_pending_fb_unpin(dev))
3319                 return ERR_PTR(-EAGAIN);
3320
3321         return ERR_PTR(-EDEADLK);
3322 }
3323
3324 /**
3325  * i915_gem_object_get_fence - set up fencing for an object
3326  * @obj: object to map through a fence reg
3327  *
3328  * When mapping objects through the GTT, userspace wants to be able to write
3329  * to them without having to worry about swizzling if the object is tiled.
3330  * This function walks the fence regs looking for a free one for @obj,
3331  * stealing one if it can't find any.
3332  *
3333  * It then sets up the reg based on the object's properties: address, pitch
3334  * and tiling format.
3335  *
3336  * For an untiled surface, this removes any existing fence.
3337  */
3338 int
3339 i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
3340 {
3341         struct drm_device *dev = obj->base.dev;
3342         struct drm_i915_private *dev_priv = dev->dev_private;
3343         bool enable = obj->tiling_mode != I915_TILING_NONE;
3344         struct drm_i915_fence_reg *reg;
3345         int ret;
3346
3347         /* Have we updated the tiling parameters upon the object and so
3348          * will need to serialise the write to the associated fence register?
3349          */
3350         if (obj->fence_dirty) {
3351                 ret = i915_gem_object_wait_fence(obj);
3352                 if (ret)
3353                         return ret;
3354         }
3355
3356         /* Just update our place in the LRU if our fence is getting reused. */
3357         if (obj->fence_reg != I915_FENCE_REG_NONE) {
3358                 reg = &dev_priv->fence_regs[obj->fence_reg];
3359                 if (!obj->fence_dirty) {
3360                         list_move_tail(&reg->lru_list,
3361                                        &dev_priv->mm.fence_list);
3362                         return 0;
3363                 }
3364         } else if (enable) {
3365                 if (WARN_ON(!obj->map_and_fenceable))
3366                         return -EINVAL;
3367
3368                 reg = i915_find_fence_reg(dev);
3369                 if (IS_ERR(reg))
3370                         return PTR_ERR(reg);
3371
3372                 if (reg->obj) {
3373                         struct drm_i915_gem_object *old = reg->obj;
3374
3375                         ret = i915_gem_object_wait_fence(old);
3376                         if (ret)
3377                                 return ret;
3378
3379                         i915_gem_object_fence_lost(old);
3380                 }
3381         } else
3382                 return 0;
3383
3384         i915_gem_object_update_fence(obj, reg, enable);
3385
3386         return 0;
3387 }
3388
3389 static bool i915_gem_valid_gtt_space(struct i915_vma *vma,
3390                                      unsigned long cache_level)
3391 {
3392         struct drm_mm_node *gtt_space = &vma->node;
3393         struct drm_mm_node *other;
3394
3395         /*
3396          * On some machines we have to be careful when putting differing types
3397          * of snoopable memory together to avoid the prefetcher crossing memory
3398          * domains and dying. During vm initialisation, we decide whether or not
3399          * these constraints apply and set the drm_mm.color_adjust
3400          * appropriately.
3401          */
3402         if (vma->vm->mm.color_adjust == NULL)
3403                 return true;
3404
3405         if (!drm_mm_node_allocated(gtt_space))
3406                 return true;
3407
3408         if (list_empty(&gtt_space->node_list))
3409                 return true;
3410
3411         other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list);
3412         if (other->allocated && !other->hole_follows && other->color != cache_level)
3413                 return false;
3414
3415         other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list);
3416         if (other->allocated && !gtt_space->hole_follows && other->color != cache_level)
3417                 return false;
3418
3419         return true;
3420 }
3421
3422 /**
3423  * Finds free space in the GTT aperture and binds the object there.
3424  */
3425 static struct i915_vma *
3426 i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
3427                            struct i915_address_space *vm,
3428                            const struct i915_ggtt_view *ggtt_view,
3429                            unsigned alignment,
3430                            uint64_t flags)
3431 {
3432         struct drm_device *dev = obj->base.dev;
3433         struct drm_i915_private *dev_priv = dev->dev_private;
3434         u32 size, fence_size, fence_alignment, unfenced_alignment;
3435         unsigned long start =
3436                 flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
3437         unsigned long end =
3438                 flags & PIN_MAPPABLE ? dev_priv->gtt.mappable_end : vm->total;
3439         struct i915_vma *vma;
3440         int ret;
3441
3442         if(WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
3443                 return ERR_PTR(-EINVAL);
3444
3445         fence_size = i915_gem_get_gtt_size(dev,
3446                                            obj->base.size,
3447                                            obj->tiling_mode);
3448         fence_alignment = i915_gem_get_gtt_alignment(dev,
3449                                                      obj->base.size,
3450                                                      obj->tiling_mode, true);
3451         unfenced_alignment =
3452                 i915_gem_get_gtt_alignment(dev,
3453                                            obj->base.size,
3454                                            obj->tiling_mode, false);
3455
3456         if (alignment == 0)
3457                 alignment = flags & PIN_MAPPABLE ? fence_alignment :
3458                                                 unfenced_alignment;
3459         if (flags & PIN_MAPPABLE && alignment & (fence_alignment - 1)) {
3460                 DRM_DEBUG("Invalid object alignment requested %u\n", alignment);
3461                 return ERR_PTR(-EINVAL);
3462         }
3463
3464         size = flags & PIN_MAPPABLE ? fence_size : obj->base.size;
3465
3466         /* If the object is bigger than the entire aperture, reject it early
3467          * before evicting everything in a vain attempt to find space.
3468          */
3469         if (obj->base.size > end) {
3470                 DRM_DEBUG("Attempting to bind an object larger than the aperture: object=%zd > %s aperture=%lu\n",
3471                           obj->base.size,
3472                           flags & PIN_MAPPABLE ? "mappable" : "total",
3473                           end);
3474                 return ERR_PTR(-E2BIG);
3475         }
3476
3477         ret = i915_gem_object_get_pages(obj);
3478         if (ret)
3479                 return ERR_PTR(ret);
3480
3481         i915_gem_object_pin_pages(obj);
3482
3483         vma = ggtt_view ? i915_gem_obj_lookup_or_create_ggtt_vma(obj, ggtt_view) :
3484                           i915_gem_obj_lookup_or_create_vma(obj, vm);
3485
3486         if (IS_ERR(vma))
3487                 goto err_unpin;
3488
3489 search_free:
3490         ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node,
3491                                                   size, alignment,
3492                                                   obj->cache_level,
3493                                                   start, end,
3494                                                   DRM_MM_SEARCH_DEFAULT,
3495                                                   DRM_MM_CREATE_DEFAULT);
3496         if (ret) {
3497                 ret = i915_gem_evict_something(dev, vm, size, alignment,
3498                                                obj->cache_level,
3499                                                start, end,
3500                                                flags);
3501                 if (ret == 0)
3502                         goto search_free;
3503
3504                 goto err_free_vma;
3505         }
3506         if (WARN_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level))) {
3507                 ret = -EINVAL;
3508                 goto err_remove_node;
3509         }
3510
3511         ret = i915_gem_gtt_prepare_object(obj);
3512         if (ret)
3513                 goto err_remove_node;
3514
3515         /*  allocate before insert / bind */
3516         if (vma->vm->allocate_va_range) {
3517                 trace_i915_va_alloc(vma->vm, vma->node.start, vma->node.size,
3518                                 VM_TO_TRACE_NAME(vma->vm));
3519                 ret = vma->vm->allocate_va_range(vma->vm,
3520                                                 vma->node.start,
3521                                                 vma->node.size);
3522                 if (ret)
3523                         goto err_remove_node;
3524         }
3525
3526         trace_i915_vma_bind(vma, flags);
3527         ret = i915_vma_bind(vma, obj->cache_level,
3528                             flags & PIN_GLOBAL ? GLOBAL_BIND : 0);
3529         if (ret)
3530                 goto err_finish_gtt;
3531
3532         list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
3533         list_add_tail(&vma->mm_list, &vm->inactive_list);
3534
3535         return vma;
3536
3537 err_finish_gtt:
3538         i915_gem_gtt_finish_object(obj);
3539 err_remove_node:
3540         drm_mm_remove_node(&vma->node);
3541 err_free_vma:
3542         i915_gem_vma_destroy(vma);
3543         vma = ERR_PTR(ret);
3544 err_unpin:
3545         i915_gem_object_unpin_pages(obj);
3546         return vma;
3547 }
3548
3549 bool
3550 i915_gem_clflush_object(struct drm_i915_gem_object *obj,
3551                         bool force)
3552 {
3553         /* If we don't have a page list set up, then we're not pinned
3554          * to GPU, and we can ignore the cache flush because it'll happen
3555          * again at bind time.
3556          */
3557         if (obj->pages == NULL)
3558                 return false;
3559
3560         /*
3561          * Stolen memory is always coherent with the GPU as it is explicitly
3562          * marked as wc by the system, or the system is cache-coherent.
3563          */
3564         if (obj->stolen || obj->phys_handle)
3565                 return false;
3566
3567         /* If the GPU is snooping the contents of the CPU cache,
3568          * we do not need to manually clear the CPU cache lines.  However,
3569          * the caches are only snooped when the render cache is
3570          * flushed/invalidated.  As we always have to emit invalidations
3571          * and flushes when moving into and out of the RENDER domain, correct
3572          * snooping behaviour occurs naturally as the result of our domain
3573          * tracking.
3574          */
3575         if (!force && cpu_cache_is_coherent(obj->base.dev, obj->cache_level)) {
3576                 obj->cache_dirty = true;
3577                 return false;
3578         }
3579
3580         trace_i915_gem_object_clflush(obj);
3581         drm_clflush_sg(obj->pages);
3582         obj->cache_dirty = false;
3583
3584         return true;
3585 }
3586
3587 /** Flushes the GTT write domain for the object if it's dirty. */
3588 static void
3589 i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj)
3590 {
3591         uint32_t old_write_domain;
3592
3593         if (obj->base.write_domain != I915_GEM_DOMAIN_GTT)
3594                 return;
3595
3596         /* No actual flushing is required for the GTT write domain.  Writes
3597          * to it immediately go to main memory as far as we know, so there's
3598          * no chipset flush.  It also doesn't land in render cache.
3599          *
3600          * However, we do have to enforce the order so that all writes through
3601          * the GTT land before any writes to the device, such as updates to
3602          * the GATT itself.
3603          */
3604         wmb();
3605
3606         old_write_domain = obj->base.write_domain;
3607         obj->base.write_domain = 0;
3608
3609         intel_fb_obj_flush(obj, false);
3610
3611         trace_i915_gem_object_change_domain(obj,
3612                                             obj->base.read_domains,
3613                                             old_write_domain);
3614 }
3615
3616 /** Flushes the CPU write domain for the object if it's dirty. */
3617 static void
3618 i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj)
3619 {
3620         uint32_t old_write_domain;
3621
3622         if (obj->base.write_domain != I915_GEM_DOMAIN_CPU)
3623                 return;
3624
3625         if (i915_gem_clflush_object(obj, obj->pin_display))
3626                 i915_gem_chipset_flush(obj->base.dev);
3627
3628         old_write_domain = obj->base.write_domain;
3629         obj->base.write_domain = 0;
3630
3631         intel_fb_obj_flush(obj, false);
3632
3633         trace_i915_gem_object_change_domain(obj,
3634                                             obj->base.read_domains,
3635                                             old_write_domain);
3636 }
3637
3638 /**
3639  * Moves a single object to the GTT read, and possibly write domain.
3640  *
3641  * This function returns when the move is complete, including waiting on
3642  * flushes to occur.
3643  */
3644 int
3645 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
3646 {
3647         uint32_t old_write_domain, old_read_domains;
3648         struct i915_vma *vma;
3649         int ret;
3650
3651         if (obj->base.write_domain == I915_GEM_DOMAIN_GTT)
3652                 return 0;
3653
3654         ret = i915_gem_object_wait_rendering(obj, !write);
3655         if (ret)
3656                 return ret;
3657
3658         i915_gem_object_retire(obj);
3659
3660         /* Flush and acquire obj->pages so that we are coherent through
3661          * direct access in memory with previous cached writes through
3662          * shmemfs and that our cache domain tracking remains valid.
3663          * For example, if the obj->filp was moved to swap without us
3664          * being notified and releasing the pages, we would mistakenly
3665          * continue to assume that the obj remained out of the CPU cached
3666          * domain.
3667          */
3668         ret = i915_gem_object_get_pages(obj);
3669         if (ret)
3670                 return ret;
3671
3672         i915_gem_object_flush_cpu_write_domain(obj);
3673
3674         /* Serialise direct access to this object with the barriers for
3675          * coherent writes from the GPU, by effectively invalidating the
3676          * GTT domain upon first access.
3677          */
3678         if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
3679                 mb();
3680
3681         old_write_domain = obj->base.write_domain;
3682         old_read_domains = obj->base.read_domains;
3683
3684         /* It should now be out of any other write domains, and we can update
3685          * the domain values for our changes.
3686          */
3687         BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
3688         obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3689         if (write) {
3690                 obj->base.read_domains = I915_GEM_DOMAIN_GTT;
3691                 obj->base.write_domain = I915_GEM_DOMAIN_GTT;
3692                 obj->dirty = 1;
3693         }
3694
3695         if (write)
3696                 intel_fb_obj_invalidate(obj, NULL, ORIGIN_GTT);
3697
3698         trace_i915_gem_object_change_domain(obj,
3699                                             old_read_domains,
3700                                             old_write_domain);
3701
3702         /* And bump the LRU for this access */
3703         vma = i915_gem_obj_to_ggtt(obj);
3704         if (vma && drm_mm_node_allocated(&vma->node) && !obj->active)
3705                 list_move_tail(&vma->mm_list,
3706                                &to_i915(obj->base.dev)->gtt.base.inactive_list);
3707
3708         return 0;
3709 }
3710
3711 int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
3712                                     enum i915_cache_level cache_level)
3713 {
3714         struct drm_device *dev = obj->base.dev;
3715         struct i915_vma *vma, *next;
3716         int ret;
3717
3718         if (obj->cache_level == cache_level)
3719                 return 0;
3720
3721         if (i915_gem_obj_is_pinned(obj)) {
3722                 DRM_DEBUG("can not change the cache level of pinned objects\n");
3723                 return -EBUSY;
3724         }
3725
3726         list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link) {
3727                 if (!i915_gem_valid_gtt_space(vma, cache_level)) {
3728                         ret = i915_vma_unbind(vma);
3729                         if (ret)
3730                                 return ret;
3731                 }
3732         }
3733
3734         if (i915_gem_obj_bound_any(obj)) {
3735                 ret = i915_gem_object_finish_gpu(obj);
3736                 if (ret)
3737                         return ret;
3738
3739                 i915_gem_object_finish_gtt(obj);
3740
3741                 /* Before SandyBridge, you could not use tiling or fence
3742                  * registers with snooped memory, so relinquish any fences
3743                  * currently pointing to our region in the aperture.
3744                  */
3745                 if (INTEL_INFO(dev)->gen < 6) {
3746                         ret = i915_gem_object_put_fence(obj);
3747                         if (ret)
3748                                 return ret;
3749                 }
3750
3751                 list_for_each_entry(vma, &obj->vma_list, vma_link)
3752                         if (drm_mm_node_allocated(&vma->node)) {
3753                                 ret = i915_vma_bind(vma, cache_level,
3754                                                     vma->bound & GLOBAL_BIND);
3755                                 if (ret)
3756                                         return ret;
3757                         }
3758         }
3759
3760         list_for_each_entry(vma, &obj->vma_list, vma_link)
3761                 vma->node.color = cache_level;
3762         obj->cache_level = cache_level;
3763
3764         if (obj->cache_dirty &&
3765             obj->base.write_domain != I915_GEM_DOMAIN_CPU &&
3766             cpu_write_needs_clflush(obj)) {
3767                 if (i915_gem_clflush_object(obj, true))
3768                         i915_gem_chipset_flush(obj->base.dev);
3769         }
3770
3771         return 0;
3772 }
3773
3774 int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
3775                                struct drm_file *file)
3776 {
3777         struct drm_i915_gem_caching *args = data;
3778         struct drm_i915_gem_object *obj;
3779         int ret;
3780
3781         ret = i915_mutex_lock_interruptible(dev);
3782         if (ret)
3783                 return ret;
3784
3785         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3786         if (&obj->base == NULL) {
3787                 ret = -ENOENT;
3788                 goto unlock;
3789         }
3790
3791         switch (obj->cache_level) {
3792         case I915_CACHE_LLC:
3793         case I915_CACHE_L3_LLC:
3794                 args->caching = I915_CACHING_CACHED;
3795                 break;
3796
3797         case I915_CACHE_WT:
3798                 args->caching = I915_CACHING_DISPLAY;
3799                 break;
3800
3801         default:
3802                 args->caching = I915_CACHING_NONE;
3803                 break;
3804         }
3805
3806         drm_gem_object_unreference(&obj->base);
3807 unlock:
3808         mutex_unlock(&dev->struct_mutex);
3809         return ret;
3810 }
3811
3812 int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
3813                                struct drm_file *file)
3814 {
3815         struct drm_i915_gem_caching *args = data;
3816         struct drm_i915_gem_object *obj;
3817         enum i915_cache_level level;
3818         int ret;
3819
3820         switch (args->caching) {
3821         case I915_CACHING_NONE:
3822                 level = I915_CACHE_NONE;
3823                 break;
3824         case I915_CACHING_CACHED:
3825                 level = I915_CACHE_LLC;
3826                 break;
3827         case I915_CACHING_DISPLAY:
3828                 level = HAS_WT(dev) ? I915_CACHE_WT : I915_CACHE_NONE;
3829                 break;
3830         default:
3831                 return -EINVAL;
3832         }
3833
3834         ret = i915_mutex_lock_interruptible(dev);
3835         if (ret)
3836                 return ret;
3837
3838         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3839         if (&obj->base == NULL) {
3840                 ret = -ENOENT;
3841                 goto unlock;
3842         }
3843
3844         ret = i915_gem_object_set_cache_level(obj, level);
3845
3846         drm_gem_object_unreference(&obj->base);
3847 unlock:
3848         mutex_unlock(&dev->struct_mutex);
3849         return ret;
3850 }
3851
3852 static bool is_pin_display(struct drm_i915_gem_object *obj)
3853 {
3854         struct i915_vma *vma;
3855
3856         vma = i915_gem_obj_to_ggtt(obj);
3857         if (!vma)
3858                 return false;
3859
3860         /* There are 2 sources that pin objects:
3861          *   1. The display engine (scanouts, sprites, cursors);
3862          *   2. Reservations for execbuffer;
3863          *
3864          * We can ignore reservations as we hold the struct_mutex and
3865          * are only called outside of the reservation path.
3866          */
3867         return vma->pin_count;
3868 }
3869
3870 /*
3871  * Prepare buffer for display plane (scanout, cursors, etc).
3872  * Can be called from an uninterruptible phase (modesetting) and allows
3873  * any flushes to be pipelined (for pageflips).
3874  */
3875 int
3876 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
3877                                      u32 alignment,
3878                                      struct intel_engine_cs *pipelined,
3879                                      const struct i915_ggtt_view *view)
3880 {
3881         u32 old_read_domains, old_write_domain;
3882         bool was_pin_display;
3883         int ret;
3884
3885         if (pipelined != i915_gem_request_get_ring(obj->last_read_req)) {
3886                 ret = i915_gem_object_sync(obj, pipelined);
3887                 if (ret)
3888                         return ret;
3889         }
3890
3891         /* Mark the pin_display early so that we account for the
3892          * display coherency whilst setting up the cache domains.
3893          */
3894         was_pin_display = obj->pin_display;
3895         obj->pin_display = true;
3896
3897         /* The display engine is not coherent with the LLC cache on gen6.  As
3898          * a result, we make sure that the pinning that is about to occur is
3899          * done with uncached PTEs. This is lowest common denominator for all
3900          * chipsets.
3901          *
3902          * However for gen6+, we could do better by using the GFDT bit instead
3903          * of uncaching, which would allow us to flush all the LLC-cached data
3904          * with that bit in the PTE to main memory with just one PIPE_CONTROL.
3905          */
3906         ret = i915_gem_object_set_cache_level(obj,
3907                                               HAS_WT(obj->base.dev) ? I915_CACHE_WT : I915_CACHE_NONE);
3908         if (ret)
3909                 goto err_unpin_display;
3910
3911         /* As the user may map the buffer once pinned in the display plane
3912          * (e.g. libkms for the bootup splash), we have to ensure that we
3913          * always use map_and_fenceable for all scanout buffers.
3914          */
3915         ret = i915_gem_object_ggtt_pin(obj, view, alignment,
3916                                        view->type == I915_GGTT_VIEW_NORMAL ?
3917                                        PIN_MAPPABLE : 0);
3918         if (ret)
3919                 goto err_unpin_display;
3920
3921         i915_gem_object_flush_cpu_write_domain(obj);
3922
3923         old_write_domain = obj->base.write_domain;
3924         old_read_domains = obj->base.read_domains;
3925
3926         /* It should now be out of any other write domains, and we can update
3927          * the domain values for our changes.
3928          */
3929         obj->base.write_domain = 0;
3930         obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3931
3932         trace_i915_gem_object_change_domain(obj,
3933                                             old_read_domains,
3934                                             old_write_domain);
3935
3936         return 0;
3937
3938 err_unpin_display:
3939         WARN_ON(was_pin_display != is_pin_display(obj));
3940         obj->pin_display = was_pin_display;
3941         return ret;
3942 }
3943
3944 void
3945 i915_gem_object_unpin_from_display_plane(struct drm_i915_gem_object *obj,
3946                                          const struct i915_ggtt_view *view)
3947 {
3948         i915_gem_object_ggtt_unpin_view(obj, view);
3949
3950         obj->pin_display = is_pin_display(obj);
3951 }
3952
3953 int
3954 i915_gem_object_finish_gpu(struct drm_i915_gem_object *obj)
3955 {
3956         int ret;
3957
3958         if ((obj->base.read_domains & I915_GEM_GPU_DOMAINS) == 0)
3959                 return 0;
3960
3961         ret = i915_gem_object_wait_rendering(obj, false);
3962         if (ret)
3963                 return ret;
3964
3965         /* Ensure that we invalidate the GPU's caches and TLBs. */
3966         obj->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
3967         return 0;
3968 }
3969
3970 /**
3971  * Moves a single object to the CPU read, and possibly write domain.
3972  *
3973  * This function returns when the move is complete, including waiting on
3974  * flushes to occur.
3975  */
3976 int
3977 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
3978 {
3979         uint32_t old_write_domain, old_read_domains;
3980         int ret;
3981
3982         if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
3983                 return 0;
3984
3985         ret = i915_gem_object_wait_rendering(obj, !write);
3986         if (ret)
3987                 return ret;
3988
3989         i915_gem_object_retire(obj);
3990         i915_gem_object_flush_gtt_write_domain(obj);
3991
3992         old_write_domain = obj->base.write_domain;
3993         old_read_domains = obj->base.read_domains;
3994
3995         /* Flush the CPU cache if it's still invalid. */
3996         if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) {
3997                 i915_gem_clflush_object(obj, false);
3998
3999                 obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
4000         }
4001
4002         /* It should now be out of any other write domains, and we can update
4003          * the domain values for our changes.
4004          */
4005         BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
4006
4007         /* If we're writing through the CPU, then the GPU read domains will
4008          * need to be invalidated at next use.
4009          */
4010         if (write) {
4011                 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4012                 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4013         }
4014
4015         if (write)
4016                 intel_fb_obj_invalidate(obj, NULL, ORIGIN_CPU);
4017
4018         trace_i915_gem_object_change_domain(obj,
4019                                             old_read_domains,
4020                                             old_write_domain);
4021
4022         return 0;
4023 }
4024
4025 /* Throttle our rendering by waiting until the ring has completed our requests
4026  * emitted over 20 msec ago.
4027  *
4028  * Note that if we were to use the current jiffies each time around the loop,
4029  * we wouldn't escape the function with any frames outstanding if the time to
4030  * render a frame was over 20ms.
4031  *
4032  * This should get us reasonable parallelism between CPU and GPU but also
4033  * relatively low latency when blocking on a particular request to finish.
4034  */
4035 static int
4036 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
4037 {
4038         struct drm_i915_private *dev_priv = dev->dev_private;
4039         struct drm_i915_file_private *file_priv = file->driver_priv;
4040         unsigned long recent_enough = jiffies - msecs_to_jiffies(20);
4041         struct drm_i915_gem_request *request, *target = NULL;
4042         unsigned reset_counter;
4043         int ret;
4044
4045         ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
4046         if (ret)
4047                 return ret;
4048
4049         ret = i915_gem_check_wedge(&dev_priv->gpu_error, false);
4050         if (ret)
4051                 return ret;
4052
4053         spin_lock(&file_priv->mm.lock);
4054         list_for_each_entry(request, &file_priv->mm.request_list, client_list) {
4055                 if (time_after_eq(request->emitted_jiffies, recent_enough))
4056                         break;
4057
4058                 target = request;
4059         }
4060         reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
4061         if (target)
4062                 i915_gem_request_reference(target);
4063         spin_unlock(&file_priv->mm.lock);
4064
4065         if (target == NULL)
4066                 return 0;
4067
4068         ret = __i915_wait_request(target, reset_counter, true, NULL, NULL);
4069         if (ret == 0)
4070                 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
4071
4072         mutex_lock(&dev->struct_mutex);
4073         i915_gem_request_unreference(target);
4074         mutex_unlock(&dev->struct_mutex);
4075
4076         return ret;
4077 }
4078
4079 static bool
4080 i915_vma_misplaced(struct i915_vma *vma, uint32_t alignment, uint64_t flags)
4081 {
4082         struct drm_i915_gem_object *obj = vma->obj;
4083
4084         if (alignment &&
4085             vma->node.start & (alignment - 1))
4086                 return true;
4087
4088         if (flags & PIN_MAPPABLE && !obj->map_and_fenceable)
4089                 return true;
4090
4091         if (flags & PIN_OFFSET_BIAS &&
4092             vma->node.start < (flags & PIN_OFFSET_MASK))
4093                 return true;
4094
4095         return false;
4096 }
4097
4098 static int
4099 i915_gem_object_do_pin(struct drm_i915_gem_object *obj,
4100                        struct i915_address_space *vm,
4101                        const struct i915_ggtt_view *ggtt_view,
4102                        uint32_t alignment,
4103                        uint64_t flags)
4104 {
4105         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
4106         struct i915_vma *vma;
4107         unsigned bound;
4108         int ret;
4109
4110         if (WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base))
4111                 return -ENODEV;
4112
4113         if (WARN_ON(flags & (PIN_GLOBAL | PIN_MAPPABLE) && !i915_is_ggtt(vm)))
4114                 return -EINVAL;
4115
4116         if (WARN_ON((flags & (PIN_MAPPABLE | PIN_GLOBAL)) == PIN_MAPPABLE))
4117                 return -EINVAL;
4118
4119         if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
4120                 return -EINVAL;
4121
4122         vma = ggtt_view ? i915_gem_obj_to_ggtt_view(obj, ggtt_view) :
4123                           i915_gem_obj_to_vma(obj, vm);
4124
4125         if (IS_ERR(vma))
4126                 return PTR_ERR(vma);
4127
4128         if (vma) {
4129                 if (WARN_ON(vma->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT))
4130                         return -EBUSY;
4131
4132                 if (i915_vma_misplaced(vma, alignment, flags)) {
4133                         unsigned long offset;
4134                         offset = ggtt_view ? i915_gem_obj_ggtt_offset_view(obj, ggtt_view) :
4135                                              i915_gem_obj_offset(obj, vm);
4136                         WARN(vma->pin_count,
4137                              "bo is already pinned in %s with incorrect alignment:"
4138                              " offset=%lx, req.alignment=%x, req.map_and_fenceable=%d,"
4139                              " obj->map_and_fenceable=%d\n",
4140                              ggtt_view ? "ggtt" : "ppgtt",
4141                              offset,
4142                              alignment,
4143                              !!(flags & PIN_MAPPABLE),
4144                              obj->map_and_fenceable);
4145                         ret = i915_vma_unbind(vma);
4146                         if (ret)
4147                                 return ret;
4148
4149                         vma = NULL;
4150                 }
4151         }
4152
4153         bound = vma ? vma->bound : 0;
4154         if (vma == NULL || !drm_mm_node_allocated(&vma->node)) {
4155                 /* In true PPGTT, bind has possibly changed PDEs, which
4156                  * means we must do a context switch before the GPU can
4157                  * accurately read some of the VMAs.
4158                  */
4159                 vma = i915_gem_object_bind_to_vm(obj, vm, ggtt_view, alignment,
4160                                                  flags);
4161                 if (IS_ERR(vma))
4162                         return PTR_ERR(vma);
4163         }
4164
4165         if (flags & PIN_GLOBAL && !(vma->bound & GLOBAL_BIND)) {
4166                 ret = i915_vma_bind(vma, obj->cache_level, GLOBAL_BIND);
4167                 if (ret)
4168                         return ret;
4169         }
4170
4171         if ((bound ^ vma->bound) & GLOBAL_BIND) {
4172                 bool mappable, fenceable;
4173                 u32 fence_size, fence_alignment;
4174
4175                 fence_size = i915_gem_get_gtt_size(obj->base.dev,
4176                                                    obj->base.size,
4177                                                    obj->tiling_mode);
4178                 fence_alignment = i915_gem_get_gtt_alignment(obj->base.dev,
4179                                                              obj->base.size,
4180                                                              obj->tiling_mode,
4181                                                              true);
4182
4183                 fenceable = (vma->node.size == fence_size &&
4184                              (vma->node.start & (fence_alignment - 1)) == 0);
4185
4186                 mappable = (vma->node.start + fence_size <=
4187                             dev_priv->gtt.mappable_end);
4188
4189                 obj->map_and_fenceable = mappable && fenceable;
4190         }
4191
4192         WARN_ON(flags & PIN_MAPPABLE && !obj->map_and_fenceable);
4193
4194         vma->pin_count++;
4195         if (flags & PIN_MAPPABLE)
4196                 obj->pin_mappable |= true;
4197
4198         return 0;
4199 }
4200
4201 int
4202 i915_gem_object_pin(struct drm_i915_gem_object *obj,
4203                     struct i915_address_space *vm,
4204                     uint32_t alignment,
4205                     uint64_t flags)
4206 {
4207         return i915_gem_object_do_pin(obj, vm,
4208                                       i915_is_ggtt(vm) ? &i915_ggtt_view_normal : NULL,
4209                                       alignment, flags);
4210 }
4211
4212 int
4213 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
4214                          const struct i915_ggtt_view *view,
4215                          uint32_t alignment,
4216                          uint64_t flags)
4217 {
4218         if (WARN_ONCE(!view, "no view specified"))
4219                 return -EINVAL;
4220
4221         return i915_gem_object_do_pin(obj, i915_obj_to_ggtt(obj), view,
4222                                       alignment, flags | PIN_GLOBAL);
4223 }
4224
4225 void
4226 i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj,
4227                                 const struct i915_ggtt_view *view)
4228 {
4229         struct i915_vma *vma = i915_gem_obj_to_ggtt_view(obj, view);
4230
4231         BUG_ON(!vma);
4232         WARN_ON(vma->pin_count == 0);
4233         WARN_ON(!i915_gem_obj_ggtt_bound_view(obj, view));
4234
4235         if (--vma->pin_count == 0 && view->type == I915_GGTT_VIEW_NORMAL)
4236                 obj->pin_mappable = false;
4237 }
4238
4239 bool
4240 i915_gem_object_pin_fence(struct drm_i915_gem_object *obj)
4241 {
4242         if (obj->fence_reg != I915_FENCE_REG_NONE) {
4243                 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
4244                 struct i915_vma *ggtt_vma = i915_gem_obj_to_ggtt(obj);
4245
4246                 WARN_ON(!ggtt_vma ||
4247                         dev_priv->fence_regs[obj->fence_reg].pin_count >
4248                         ggtt_vma->pin_count);
4249                 dev_priv->fence_regs[obj->fence_reg].pin_count++;
4250                 return true;
4251         } else
4252                 return false;
4253 }
4254
4255 void
4256 i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj)
4257 {
4258         if (obj->fence_reg != I915_FENCE_REG_NONE) {
4259                 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
4260                 WARN_ON(dev_priv->fence_regs[obj->fence_reg].pin_count <= 0);
4261                 dev_priv->fence_regs[obj->fence_reg].pin_count--;
4262         }
4263 }
4264
4265 int
4266 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
4267                     struct drm_file *file)
4268 {
4269         struct drm_i915_gem_busy *args = data;
4270         struct drm_i915_gem_object *obj;
4271         int ret;
4272
4273         ret = i915_mutex_lock_interruptible(dev);
4274         if (ret)
4275                 return ret;
4276
4277         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
4278         if (&obj->base == NULL) {
4279                 ret = -ENOENT;
4280                 goto unlock;
4281         }
4282
4283         /* Count all active objects as busy, even if they are currently not used
4284          * by the gpu. Users of this interface expect objects to eventually
4285          * become non-busy without any further actions, therefore emit any
4286          * necessary flushes here.
4287          */
4288         ret = i915_gem_object_flush_active(obj);
4289
4290         args->busy = obj->active;
4291         if (obj->last_read_req) {
4292                 struct intel_engine_cs *ring;
4293                 BUILD_BUG_ON(I915_NUM_RINGS > 16);
4294                 ring = i915_gem_request_get_ring(obj->last_read_req);
4295                 args->busy |= intel_ring_flag(ring) << 16;
4296         }
4297
4298         drm_gem_object_unreference(&obj->base);
4299 unlock:
4300         mutex_unlock(&dev->struct_mutex);
4301         return ret;
4302 }
4303
4304 int
4305 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
4306                         struct drm_file *file_priv)
4307 {
4308         return i915_gem_ring_throttle(dev, file_priv);
4309 }
4310
4311 int
4312 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
4313                        struct drm_file *file_priv)
4314 {
4315         struct drm_i915_private *dev_priv = dev->dev_private;
4316         struct drm_i915_gem_madvise *args = data;
4317         struct drm_i915_gem_object *obj;
4318         int ret;
4319
4320         switch (args->madv) {
4321         case I915_MADV_DONTNEED:
4322         case I915_MADV_WILLNEED:
4323             break;
4324         default:
4325             return -EINVAL;
4326         }
4327
4328         ret = i915_mutex_lock_interruptible(dev);
4329         if (ret)
4330                 return ret;
4331
4332         obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle));
4333         if (&obj->base == NULL) {
4334                 ret = -ENOENT;
4335                 goto unlock;
4336         }
4337
4338         if (i915_gem_obj_is_pinned(obj)) {
4339                 ret = -EINVAL;
4340                 goto out;
4341         }
4342
4343         if (obj->pages &&
4344             obj->tiling_mode != I915_TILING_NONE &&
4345             dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
4346                 if (obj->madv == I915_MADV_WILLNEED)
4347                         i915_gem_object_unpin_pages(obj);
4348                 if (args->madv == I915_MADV_WILLNEED)
4349                         i915_gem_object_pin_pages(obj);
4350         }
4351
4352         if (obj->madv != __I915_MADV_PURGED)
4353                 obj->madv = args->madv;
4354
4355         /* if the object is no longer attached, discard its backing storage */
4356         if (obj->madv == I915_MADV_DONTNEED && obj->pages == NULL)
4357                 i915_gem_object_truncate(obj);
4358
4359         args->retained = obj->madv != __I915_MADV_PURGED;
4360
4361 out:
4362         drm_gem_object_unreference(&obj->base);
4363 unlock:
4364         mutex_unlock(&dev->struct_mutex);
4365         return ret;
4366 }
4367
4368 void i915_gem_object_init(struct drm_i915_gem_object *obj,
4369                           const struct drm_i915_gem_object_ops *ops)
4370 {
4371         INIT_LIST_HEAD(&obj->global_list);
4372         INIT_LIST_HEAD(&obj->ring_list);
4373         INIT_LIST_HEAD(&obj->obj_exec_link);
4374         INIT_LIST_HEAD(&obj->vma_list);
4375         INIT_LIST_HEAD(&obj->batch_pool_list);
4376
4377         obj->ops = ops;
4378
4379         obj->fence_reg = I915_FENCE_REG_NONE;
4380         obj->madv = I915_MADV_WILLNEED;
4381
4382         i915_gem_info_add_obj(obj->base.dev->dev_private, obj->base.size);
4383 }
4384
4385 static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
4386         .get_pages = i915_gem_object_get_pages_gtt,
4387         .put_pages = i915_gem_object_put_pages_gtt,
4388 };
4389
4390 struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
4391                                                   size_t size)
4392 {
4393         struct drm_i915_gem_object *obj;
4394         struct address_space *mapping;
4395         gfp_t mask;
4396
4397         obj = i915_gem_object_alloc(dev);
4398         if (obj == NULL)
4399                 return NULL;
4400
4401         if (drm_gem_object_init(dev, &obj->base, size) != 0) {
4402                 i915_gem_object_free(obj);
4403                 return NULL;
4404         }
4405
4406         mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
4407         if (IS_CRESTLINE(dev) || IS_BROADWATER(dev)) {
4408                 /* 965gm cannot relocate objects above 4GiB. */
4409                 mask &= ~__GFP_HIGHMEM;
4410                 mask |= __GFP_DMA32;
4411         }
4412
4413         mapping = file_inode(obj->base.filp)->i_mapping;
4414         mapping_set_gfp_mask(mapping, mask);
4415
4416         i915_gem_object_init(obj, &i915_gem_object_ops);
4417
4418         obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4419         obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4420
4421         if (HAS_LLC(dev)) {
4422                 /* On some devices, we can have the GPU use the LLC (the CPU
4423                  * cache) for about a 10% performance improvement
4424                  * compared to uncached.  Graphics requests other than
4425                  * display scanout are coherent with the CPU in
4426                  * accessing this cache.  This means in this mode we
4427                  * don't need to clflush on the CPU side, and on the
4428                  * GPU side we only need to flush internal caches to
4429                  * get data visible to the CPU.
4430                  *
4431                  * However, we maintain the display planes as UC, and so
4432                  * need to rebind when first used as such.
4433                  */
4434                 obj->cache_level = I915_CACHE_LLC;
4435         } else
4436                 obj->cache_level = I915_CACHE_NONE;
4437
4438         trace_i915_gem_object_create(obj);
4439
4440         return obj;
4441 }
4442
4443 static bool discard_backing_storage(struct drm_i915_gem_object *obj)
4444 {
4445         /* If we are the last user of the backing storage (be it shmemfs
4446          * pages or stolen etc), we know that the pages are going to be
4447          * immediately released. In this case, we can then skip copying
4448          * back the contents from the GPU.
4449          */
4450
4451         if (obj->madv != I915_MADV_WILLNEED)
4452                 return false;
4453
4454         if (obj->base.filp == NULL)
4455                 return true;
4456
4457         /* At first glance, this looks racy, but then again so would be
4458          * userspace racing mmap against close. However, the first external
4459          * reference to the filp can only be obtained through the
4460          * i915_gem_mmap_ioctl() which safeguards us against the user
4461          * acquiring such a reference whilst we are in the middle of
4462          * freeing the object.
4463          */
4464         return atomic_long_read(&obj->base.filp->f_count) == 1;
4465 }
4466
4467 void i915_gem_free_object(struct drm_gem_object *gem_obj)
4468 {
4469         struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
4470         struct drm_device *dev = obj->base.dev;
4471         struct drm_i915_private *dev_priv = dev->dev_private;
4472         struct i915_vma *vma, *next;
4473
4474         intel_runtime_pm_get(dev_priv);
4475
4476         trace_i915_gem_object_destroy(obj);
4477
4478         list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link) {
4479                 int ret;
4480
4481                 vma->pin_count = 0;
4482                 ret = i915_vma_unbind(vma);
4483                 if (WARN_ON(ret == -ERESTARTSYS)) {
4484                         bool was_interruptible;
4485
4486                         was_interruptible = dev_priv->mm.interruptible;
4487                         dev_priv->mm.interruptible = false;
4488
4489                         WARN_ON(i915_vma_unbind(vma));
4490
4491                         dev_priv->mm.interruptible = was_interruptible;
4492                 }
4493         }
4494
4495         /* Stolen objects don't hold a ref, but do hold pin count. Fix that up
4496          * before progressing. */
4497         if (obj->stolen)
4498                 i915_gem_object_unpin_pages(obj);
4499
4500         WARN_ON(obj->frontbuffer_bits);
4501
4502         if (obj->pages && obj->madv == I915_MADV_WILLNEED &&
4503             dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES &&
4504             obj->tiling_mode != I915_TILING_NONE)
4505                 i915_gem_object_unpin_pages(obj);
4506
4507         if (WARN_ON(obj->pages_pin_count))
4508                 obj->pages_pin_count = 0;
4509         if (discard_backing_storage(obj))
4510                 obj->madv = I915_MADV_DONTNEED;
4511         i915_gem_object_put_pages(obj);
4512         i915_gem_object_free_mmap_offset(obj);
4513
4514         BUG_ON(obj->pages);
4515
4516         if (obj->base.import_attach)
4517                 drm_prime_gem_destroy(&obj->base, NULL);
4518
4519         if (obj->ops->release)
4520                 obj->ops->release(obj);
4521
4522         drm_gem_object_release(&obj->base);
4523         i915_gem_info_remove_obj(dev_priv, obj->base.size);
4524
4525         kfree(obj->bit_17);
4526         i915_gem_object_free(obj);
4527
4528         intel_runtime_pm_put(dev_priv);
4529 }
4530
4531 struct i915_vma *i915_gem_obj_to_vma(struct drm_i915_gem_object *obj,
4532                                      struct i915_address_space *vm)
4533 {
4534         struct i915_vma *vma;
4535         list_for_each_entry(vma, &obj->vma_list, vma_link) {
4536                 if (i915_is_ggtt(vma->vm) &&
4537                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
4538                         continue;
4539                 if (vma->vm == vm)
4540                         return vma;
4541         }
4542         return NULL;
4543 }
4544
4545 struct i915_vma *i915_gem_obj_to_ggtt_view(struct drm_i915_gem_object *obj,
4546                                            const struct i915_ggtt_view *view)
4547 {
4548         struct i915_address_space *ggtt = i915_obj_to_ggtt(obj);
4549         struct i915_vma *vma;
4550
4551         if (WARN_ONCE(!view, "no view specified"))
4552                 return ERR_PTR(-EINVAL);
4553
4554         list_for_each_entry(vma, &obj->vma_list, vma_link)
4555                 if (vma->vm == ggtt &&
4556                     i915_ggtt_view_equal(&vma->ggtt_view, view))
4557                         return vma;
4558         return NULL;
4559 }
4560
4561 void i915_gem_vma_destroy(struct i915_vma *vma)
4562 {
4563         struct i915_address_space *vm = NULL;
4564         WARN_ON(vma->node.allocated);
4565
4566         /* Keep the vma as a placeholder in the execbuffer reservation lists */
4567         if (!list_empty(&vma->exec_list))
4568                 return;
4569
4570         vm = vma->vm;
4571
4572         if (!i915_is_ggtt(vm))
4573                 i915_ppgtt_put(i915_vm_to_ppgtt(vm));
4574
4575         list_del(&vma->vma_link);
4576
4577         kfree(vma);
4578 }
4579
4580 static void
4581 i915_gem_stop_ringbuffers(struct drm_device *dev)
4582 {
4583         struct drm_i915_private *dev_priv = dev->dev_private;
4584         struct intel_engine_cs *ring;
4585         int i;
4586
4587         for_each_ring(ring, dev_priv, i)
4588                 dev_priv->gt.stop_ring(ring);
4589 }
4590
4591 int
4592 i915_gem_suspend(struct drm_device *dev)
4593 {
4594         struct drm_i915_private *dev_priv = dev->dev_private;
4595         int ret = 0;
4596
4597         mutex_lock(&dev->struct_mutex);
4598         ret = i915_gpu_idle(dev);
4599         if (ret)
4600                 goto err;
4601
4602         i915_gem_retire_requests(dev);
4603
4604         i915_gem_stop_ringbuffers(dev);
4605         mutex_unlock(&dev->struct_mutex);
4606
4607         cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
4608         cancel_delayed_work_sync(&dev_priv->mm.retire_work);
4609         flush_delayed_work(&dev_priv->mm.idle_work);
4610
4611         /* Assert that we sucessfully flushed all the work and
4612          * reset the GPU back to its idle, low power state.
4613          */
4614         WARN_ON(dev_priv->mm.busy);
4615
4616         return 0;
4617
4618 err:
4619         mutex_unlock(&dev->struct_mutex);
4620         return ret;
4621 }
4622
4623 int i915_gem_l3_remap(struct intel_engine_cs *ring, int slice)
4624 {
4625         struct drm_device *dev = ring->dev;
4626         struct drm_i915_private *dev_priv = dev->dev_private;
4627         u32 reg_base = GEN7_L3LOG_BASE + (slice * 0x200);
4628         u32 *remap_info = dev_priv->l3_parity.remap_info[slice];
4629         int i, ret;
4630
4631         if (!HAS_L3_DPF(dev) || !remap_info)
4632                 return 0;
4633
4634         ret = intel_ring_begin(ring, GEN7_L3LOG_SIZE / 4 * 3);
4635         if (ret)
4636                 return ret;
4637
4638         /*
4639          * Note: We do not worry about the concurrent register cacheline hang
4640          * here because no other code should access these registers other than
4641          * at initialization time.
4642          */
4643         for (i = 0; i < GEN7_L3LOG_SIZE; i += 4) {
4644                 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
4645                 intel_ring_emit(ring, reg_base + i);
4646                 intel_ring_emit(ring, remap_info[i/4]);
4647         }
4648
4649         intel_ring_advance(ring);
4650
4651         return ret;
4652 }
4653
4654 void i915_gem_init_swizzling(struct drm_device *dev)
4655 {
4656         struct drm_i915_private *dev_priv = dev->dev_private;
4657
4658         if (INTEL_INFO(dev)->gen < 5 ||
4659             dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
4660                 return;
4661
4662         I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
4663                                  DISP_TILE_SURFACE_SWIZZLING);
4664
4665         if (IS_GEN5(dev))
4666                 return;
4667
4668         I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
4669         if (IS_GEN6(dev))
4670                 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
4671         else if (IS_GEN7(dev))
4672                 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
4673         else if (IS_GEN8(dev))
4674                 I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));
4675         else
4676                 BUG();
4677 }
4678
4679 static bool
4680 intel_enable_blt(struct drm_device *dev)
4681 {
4682         if (!HAS_BLT(dev))
4683                 return false;
4684
4685         /* The blitter was dysfunctional on early prototypes */
4686         if (IS_GEN6(dev) && dev->pdev->revision < 8) {
4687                 DRM_INFO("BLT not supported on this pre-production hardware;"
4688                          " graphics performance will be degraded.\n");
4689                 return false;
4690         }
4691
4692         return true;
4693 }
4694
4695 static void init_unused_ring(struct drm_device *dev, u32 base)
4696 {
4697         struct drm_i915_private *dev_priv = dev->dev_private;
4698
4699         I915_WRITE(RING_CTL(base), 0);
4700         I915_WRITE(RING_HEAD(base), 0);
4701         I915_WRITE(RING_TAIL(base), 0);
4702         I915_WRITE(RING_START(base), 0);
4703 }
4704
4705 static void init_unused_rings(struct drm_device *dev)
4706 {
4707         if (IS_I830(dev)) {
4708                 init_unused_ring(dev, PRB1_BASE);
4709                 init_unused_ring(dev, SRB0_BASE);
4710                 init_unused_ring(dev, SRB1_BASE);
4711                 init_unused_ring(dev, SRB2_BASE);
4712                 init_unused_ring(dev, SRB3_BASE);
4713         } else if (IS_GEN2(dev)) {
4714                 init_unused_ring(dev, SRB0_BASE);
4715                 init_unused_ring(dev, SRB1_BASE);
4716         } else if (IS_GEN3(dev)) {
4717                 init_unused_ring(dev, PRB1_BASE);
4718                 init_unused_ring(dev, PRB2_BASE);
4719         }
4720 }
4721
4722 int i915_gem_init_rings(struct drm_device *dev)
4723 {
4724         struct drm_i915_private *dev_priv = dev->dev_private;
4725         int ret;
4726
4727         ret = intel_init_render_ring_buffer(dev);
4728         if (ret)
4729                 return ret;
4730
4731         if (HAS_BSD(dev)) {
4732                 ret = intel_init_bsd_ring_buffer(dev);
4733                 if (ret)
4734                         goto cleanup_render_ring;
4735         }
4736
4737         if (intel_enable_blt(dev)) {
4738                 ret = intel_init_blt_ring_buffer(dev);
4739                 if (ret)
4740                         goto cleanup_bsd_ring;
4741         }
4742
4743         if (HAS_VEBOX(dev)) {
4744                 ret = intel_init_vebox_ring_buffer(dev);
4745                 if (ret)
4746                         goto cleanup_blt_ring;
4747         }
4748
4749         if (HAS_BSD2(dev)) {
4750                 ret = intel_init_bsd2_ring_buffer(dev);
4751                 if (ret)
4752                         goto cleanup_vebox_ring;
4753         }
4754
4755         ret = i915_gem_set_seqno(dev, ((u32)~0 - 0x1000));
4756         if (ret)
4757                 goto cleanup_bsd2_ring;
4758
4759         return 0;
4760
4761 cleanup_bsd2_ring:
4762         intel_cleanup_ring_buffer(&dev_priv->ring[VCS2]);
4763 cleanup_vebox_ring:
4764         intel_cleanup_ring_buffer(&dev_priv->ring[VECS]);
4765 cleanup_blt_ring:
4766         intel_cleanup_ring_buffer(&dev_priv->ring[BCS]);
4767 cleanup_bsd_ring:
4768         intel_cleanup_ring_buffer(&dev_priv->ring[VCS]);
4769 cleanup_render_ring:
4770         intel_cleanup_ring_buffer(&dev_priv->ring[RCS]);
4771
4772         return ret;
4773 }
4774
4775 int
4776 i915_gem_init_hw(struct drm_device *dev)
4777 {
4778         struct drm_i915_private *dev_priv = dev->dev_private;
4779         struct intel_engine_cs *ring;
4780         int ret, i;
4781
4782         if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
4783                 return -EIO;
4784
4785         /* Double layer security blanket, see i915_gem_init() */
4786         intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
4787
4788         if (dev_priv->ellc_size)
4789                 I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf));
4790
4791         if (IS_HASWELL(dev))
4792                 I915_WRITE(MI_PREDICATE_RESULT_2, IS_HSW_GT3(dev) ?
4793                            LOWER_SLICE_ENABLED : LOWER_SLICE_DISABLED);
4794
4795         if (HAS_PCH_NOP(dev)) {
4796                 if (IS_IVYBRIDGE(dev)) {
4797                         u32 temp = I915_READ(GEN7_MSG_CTL);
4798                         temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
4799                         I915_WRITE(GEN7_MSG_CTL, temp);
4800                 } else if (INTEL_INFO(dev)->gen >= 7) {
4801                         u32 temp = I915_READ(HSW_NDE_RSTWRN_OPT);
4802                         temp &= ~RESET_PCH_HANDSHAKE_ENABLE;
4803                         I915_WRITE(HSW_NDE_RSTWRN_OPT, temp);
4804                 }
4805         }
4806
4807         i915_gem_init_swizzling(dev);
4808
4809         /*
4810          * At least 830 can leave some of the unused rings
4811          * "active" (ie. head != tail) after resume which
4812          * will prevent c3 entry. Makes sure all unused rings
4813          * are totally idle.
4814          */
4815         init_unused_rings(dev);
4816
4817         for_each_ring(ring, dev_priv, i) {
4818                 ret = ring->init_hw(ring);
4819                 if (ret)
4820                         goto out;
4821         }
4822
4823         for (i = 0; i < NUM_L3_SLICES(dev); i++)
4824                 i915_gem_l3_remap(&dev_priv->ring[RCS], i);
4825
4826         ret = i915_ppgtt_init_hw(dev);
4827         if (ret && ret != -EIO) {
4828                 DRM_ERROR("PPGTT enable failed %d\n", ret);
4829                 i915_gem_cleanup_ringbuffer(dev);
4830         }
4831
4832         ret = i915_gem_context_enable(dev_priv);
4833         if (ret && ret != -EIO) {
4834                 DRM_ERROR("Context enable failed %d\n", ret);
4835                 i915_gem_cleanup_ringbuffer(dev);
4836
4837                 goto out;
4838         }
4839
4840 out:
4841         intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
4842         return ret;
4843 }
4844
4845 int i915_gem_init(struct drm_device *dev)
4846 {
4847         struct drm_i915_private *dev_priv = dev->dev_private;
4848         int ret;
4849
4850         i915.enable_execlists = intel_sanitize_enable_execlists(dev,
4851                         i915.enable_execlists);
4852
4853         mutex_lock(&dev->struct_mutex);
4854
4855         if (IS_VALLEYVIEW(dev)) {
4856                 /* VLVA0 (potential hack), BIOS isn't actually waking us */
4857                 I915_WRITE(VLV_GTLC_WAKE_CTRL, VLV_GTLC_ALLOWWAKEREQ);
4858                 if (wait_for((I915_READ(VLV_GTLC_PW_STATUS) &
4859                               VLV_GTLC_ALLOWWAKEACK), 10))
4860                         DRM_DEBUG_DRIVER("allow wake ack timed out\n");
4861         }
4862
4863         if (!i915.enable_execlists) {
4864                 dev_priv->gt.do_execbuf = i915_gem_ringbuffer_submission;
4865                 dev_priv->gt.init_rings = i915_gem_init_rings;
4866                 dev_priv->gt.cleanup_ring = intel_cleanup_ring_buffer;
4867                 dev_priv->gt.stop_ring = intel_stop_ring_buffer;
4868         } else {
4869                 dev_priv->gt.do_execbuf = intel_execlists_submission;
4870                 dev_priv->gt.init_rings = intel_logical_rings_init;
4871                 dev_priv->gt.cleanup_ring = intel_logical_ring_cleanup;
4872                 dev_priv->gt.stop_ring = intel_logical_ring_stop;
4873         }
4874
4875         /* This is just a security blanket to placate dragons.
4876          * On some systems, we very sporadically observe that the first TLBs
4877          * used by the CS may be stale, despite us poking the TLB reset. If
4878          * we hold the forcewake during initialisation these problems
4879          * just magically go away.
4880          */
4881         intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
4882
4883         ret = i915_gem_init_userptr(dev);
4884         if (ret)
4885                 goto out_unlock;
4886
4887         i915_gem_init_global_gtt(dev);
4888
4889         ret = i915_gem_context_init(dev);
4890         if (ret)
4891                 goto out_unlock;
4892
4893         ret = dev_priv->gt.init_rings(dev);
4894         if (ret)
4895                 goto out_unlock;
4896
4897         ret = i915_gem_init_hw(dev);
4898         if (ret == -EIO) {
4899                 /* Allow ring initialisation to fail by marking the GPU as
4900                  * wedged. But we only want to do this where the GPU is angry,
4901                  * for all other failure, such as an allocation failure, bail.
4902                  */
4903                 DRM_ERROR("Failed to initialize GPU, declaring it wedged\n");
4904                 atomic_set_mask(I915_WEDGED, &dev_priv->gpu_error.reset_counter);
4905                 ret = 0;
4906         }
4907
4908 out_unlock:
4909         intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
4910         mutex_unlock(&dev->struct_mutex);
4911
4912         return ret;
4913 }
4914
4915 void
4916 i915_gem_cleanup_ringbuffer(struct drm_device *dev)
4917 {
4918         struct drm_i915_private *dev_priv = dev->dev_private;
4919         struct intel_engine_cs *ring;
4920         int i;
4921
4922         for_each_ring(ring, dev_priv, i)
4923                 dev_priv->gt.cleanup_ring(ring);
4924 }
4925
4926 static void
4927 init_ring_lists(struct intel_engine_cs *ring)
4928 {
4929         INIT_LIST_HEAD(&ring->active_list);
4930         INIT_LIST_HEAD(&ring->request_list);
4931 }
4932
4933 void i915_init_vm(struct drm_i915_private *dev_priv,
4934                   struct i915_address_space *vm)
4935 {
4936         if (!i915_is_ggtt(vm))
4937                 drm_mm_init(&vm->mm, vm->start, vm->total);
4938         vm->dev = dev_priv->dev;
4939         INIT_LIST_HEAD(&vm->active_list);
4940         INIT_LIST_HEAD(&vm->inactive_list);
4941         INIT_LIST_HEAD(&vm->global_link);
4942         list_add_tail(&vm->global_link, &dev_priv->vm_list);
4943 }
4944
4945 void
4946 i915_gem_load(struct drm_device *dev)
4947 {
4948         struct drm_i915_private *dev_priv = dev->dev_private;
4949         int i;
4950
4951         dev_priv->slab =
4952                 kmem_cache_create("i915_gem_object",
4953                                   sizeof(struct drm_i915_gem_object), 0,
4954                                   SLAB_HWCACHE_ALIGN,
4955                                   NULL);
4956
4957         INIT_LIST_HEAD(&dev_priv->vm_list);
4958         i915_init_vm(dev_priv, &dev_priv->gtt.base);
4959
4960         INIT_LIST_HEAD(&dev_priv->context_list);
4961         INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
4962         INIT_LIST_HEAD(&dev_priv->mm.bound_list);
4963         INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4964         for (i = 0; i < I915_NUM_RINGS; i++)
4965                 init_ring_lists(&dev_priv->ring[i]);
4966         for (i = 0; i < I915_MAX_NUM_FENCES; i++)
4967                 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
4968         INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
4969                           i915_gem_retire_work_handler);
4970         INIT_DELAYED_WORK(&dev_priv->mm.idle_work,
4971                           i915_gem_idle_work_handler);
4972         init_waitqueue_head(&dev_priv->gpu_error.reset_queue);
4973
4974         dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL;
4975
4976         if (INTEL_INFO(dev)->gen >= 7 && !IS_VALLEYVIEW(dev))
4977                 dev_priv->num_fence_regs = 32;
4978         else if (INTEL_INFO(dev)->gen >= 4 || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
4979                 dev_priv->num_fence_regs = 16;
4980         else
4981                 dev_priv->num_fence_regs = 8;
4982
4983         if (intel_vgpu_active(dev))
4984                 dev_priv->num_fence_regs =
4985                                 I915_READ(vgtif_reg(avail_rs.fence_num));
4986
4987         /* Initialize fence registers to zero */
4988         INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4989         i915_gem_restore_fences(dev);
4990
4991         i915_gem_detect_bit_6_swizzle(dev);
4992         init_waitqueue_head(&dev_priv->pending_flip_queue);
4993
4994         dev_priv->mm.interruptible = true;
4995
4996         i915_gem_shrinker_init(dev_priv);
4997
4998         i915_gem_batch_pool_init(dev, &dev_priv->mm.batch_pool);
4999
5000         mutex_init(&dev_priv->fb_tracking.lock);
5001 }
5002
5003 void i915_gem_release(struct drm_device *dev, struct drm_file *file)
5004 {
5005         struct drm_i915_file_private *file_priv = file->driver_priv;
5006
5007         cancel_delayed_work_sync(&file_priv->mm.idle_work);
5008
5009         /* Clean up our request list when the client is going away, so that
5010          * later retire_requests won't dereference our soon-to-be-gone
5011          * file_priv.
5012          */
5013         spin_lock(&file_priv->mm.lock);
5014         while (!list_empty(&file_priv->mm.request_list)) {
5015                 struct drm_i915_gem_request *request;
5016
5017                 request = list_first_entry(&file_priv->mm.request_list,
5018                                            struct drm_i915_gem_request,
5019                                            client_list);
5020                 list_del(&request->client_list);
5021                 request->file_priv = NULL;
5022         }
5023         spin_unlock(&file_priv->mm.lock);
5024 }
5025
5026 static void
5027 i915_gem_file_idle_work_handler(struct work_struct *work)
5028 {
5029         struct drm_i915_file_private *file_priv =
5030                 container_of(work, typeof(*file_priv), mm.idle_work.work);
5031
5032         atomic_set(&file_priv->rps_wait_boost, false);
5033 }
5034
5035 int i915_gem_open(struct drm_device *dev, struct drm_file *file)
5036 {
5037         struct drm_i915_file_private *file_priv;
5038         int ret;
5039
5040         DRM_DEBUG_DRIVER("\n");
5041
5042         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
5043         if (!file_priv)
5044                 return -ENOMEM;
5045
5046         file->driver_priv = file_priv;
5047         file_priv->dev_priv = dev->dev_private;
5048         file_priv->file = file;
5049
5050         spin_lock_init(&file_priv->mm.lock);
5051         INIT_LIST_HEAD(&file_priv->mm.request_list);
5052         INIT_DELAYED_WORK(&file_priv->mm.idle_work,
5053                           i915_gem_file_idle_work_handler);
5054
5055         ret = i915_gem_context_open(dev, file);
5056         if (ret)
5057                 kfree(file_priv);
5058
5059         return ret;
5060 }
5061
5062 /**
5063  * i915_gem_track_fb - update frontbuffer tracking
5064  * old: current GEM buffer for the frontbuffer slots
5065  * new: new GEM buffer for the frontbuffer slots
5066  * frontbuffer_bits: bitmask of frontbuffer slots
5067  *
5068  * This updates the frontbuffer tracking bits @frontbuffer_bits by clearing them
5069  * from @old and setting them in @new. Both @old and @new can be NULL.
5070  */
5071 void i915_gem_track_fb(struct drm_i915_gem_object *old,
5072                        struct drm_i915_gem_object *new,
5073                        unsigned frontbuffer_bits)
5074 {
5075         if (old) {
5076                 WARN_ON(!mutex_is_locked(&old->base.dev->struct_mutex));
5077                 WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits));
5078                 old->frontbuffer_bits &= ~frontbuffer_bits;
5079         }
5080
5081         if (new) {
5082                 WARN_ON(!mutex_is_locked(&new->base.dev->struct_mutex));
5083                 WARN_ON(new->frontbuffer_bits & frontbuffer_bits);
5084                 new->frontbuffer_bits |= frontbuffer_bits;
5085         }
5086 }
5087
5088 /* All the new VM stuff */
5089 unsigned long
5090 i915_gem_obj_offset(struct drm_i915_gem_object *o,
5091                     struct i915_address_space *vm)
5092 {
5093         struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5094         struct i915_vma *vma;
5095
5096         WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base);
5097
5098         list_for_each_entry(vma, &o->vma_list, vma_link) {
5099                 if (i915_is_ggtt(vma->vm) &&
5100                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5101                         continue;
5102                 if (vma->vm == vm)
5103                         return vma->node.start;
5104         }
5105
5106         WARN(1, "%s vma for this object not found.\n",
5107              i915_is_ggtt(vm) ? "global" : "ppgtt");
5108         return -1;
5109 }
5110
5111 unsigned long
5112 i915_gem_obj_ggtt_offset_view(struct drm_i915_gem_object *o,
5113                               const struct i915_ggtt_view *view)
5114 {
5115         struct i915_address_space *ggtt = i915_obj_to_ggtt(o);
5116         struct i915_vma *vma;
5117
5118         list_for_each_entry(vma, &o->vma_list, vma_link)
5119                 if (vma->vm == ggtt &&
5120                     i915_ggtt_view_equal(&vma->ggtt_view, view))
5121                         return vma->node.start;
5122
5123         WARN(1, "global vma for this object not found.\n");
5124         return -1;
5125 }
5126
5127 bool i915_gem_obj_bound(struct drm_i915_gem_object *o,
5128                         struct i915_address_space *vm)
5129 {
5130         struct i915_vma *vma;
5131
5132         list_for_each_entry(vma, &o->vma_list, vma_link) {
5133                 if (i915_is_ggtt(vma->vm) &&
5134                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5135                         continue;
5136                 if (vma->vm == vm && drm_mm_node_allocated(&vma->node))
5137                         return true;
5138         }
5139
5140         return false;
5141 }
5142
5143 bool i915_gem_obj_ggtt_bound_view(struct drm_i915_gem_object *o,
5144                                   const struct i915_ggtt_view *view)
5145 {
5146         struct i915_address_space *ggtt = i915_obj_to_ggtt(o);
5147         struct i915_vma *vma;
5148
5149         list_for_each_entry(vma, &o->vma_list, vma_link)
5150                 if (vma->vm == ggtt &&
5151                     i915_ggtt_view_equal(&vma->ggtt_view, view) &&
5152                     drm_mm_node_allocated(&vma->node))
5153                         return true;
5154
5155         return false;
5156 }
5157
5158 bool i915_gem_obj_bound_any(struct drm_i915_gem_object *o)
5159 {
5160         struct i915_vma *vma;
5161
5162         list_for_each_entry(vma, &o->vma_list, vma_link)
5163                 if (drm_mm_node_allocated(&vma->node))
5164                         return true;
5165
5166         return false;
5167 }
5168
5169 unsigned long i915_gem_obj_size(struct drm_i915_gem_object *o,
5170                                 struct i915_address_space *vm)
5171 {
5172         struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5173         struct i915_vma *vma;
5174
5175         WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base);
5176
5177         BUG_ON(list_empty(&o->vma_list));
5178
5179         list_for_each_entry(vma, &o->vma_list, vma_link) {
5180                 if (i915_is_ggtt(vma->vm) &&
5181                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5182                         continue;
5183                 if (vma->vm == vm)
5184                         return vma->node.size;
5185         }
5186         return 0;
5187 }
5188
5189 bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj)
5190 {
5191         struct i915_vma *vma;
5192         list_for_each_entry(vma, &obj->vma_list, vma_link) {
5193                 if (i915_is_ggtt(vma->vm) &&
5194                     vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5195                         continue;
5196                 if (vma->pin_count > 0)
5197                         return true;
5198         }
5199         return false;
5200 }
5201