drivers/gpu/drm/i915/i915_gem.c

   1 /*
   2  * Copyright © 2008 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 "drmP.h"
  29 #include "drm.h"
  30 #include "i915_drm.h"
  31 #include "i915_drv.h"
  32 #include "i915_trace.h"
  33 #include "intel_drv.h"
  34 #include <linux/shmem_fs.h>
  35 #include <linux/slab.h>
  36 #include <linux/swap.h>
  37 #include <linux/pci.h>
  38
  39 static __must_check int i915_gem_object_flush_gpu_write_domain(struct drm_i915_gem_object *obj);
  40 static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
  41 static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj);
  42 static __must_check int i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj,
  43                                                           bool write);
  44 static __must_check int i915_gem_object_set_cpu_read_domain_range(struct drm_i915_gem_object *obj,
  45                                                                   uint64_t offset,
  46                                                                   uint64_t size);
  47 static void i915_gem_object_set_to_full_cpu_read_domain(struct drm_i915_gem_object *obj);
  48 static __must_check int i915_gem_object_bind_to_gtt(struct drm_i915_gem_object *obj,
  49                                                     unsigned alignment,
  50                                                     bool map_and_fenceable);
  51 static void i915_gem_clear_fence_reg(struct drm_device *dev,
  52                                      struct drm_i915_fence_reg *reg);
  53 static int i915_gem_phys_pwrite(struct drm_device *dev,
  54                                 struct drm_i915_gem_object *obj,
  55                                 struct drm_i915_gem_pwrite *args,
  56                                 struct drm_file *file);
  57 static void i915_gem_free_object_tail(struct drm_i915_gem_object *obj);
  58
  59 static int i915_gem_inactive_shrink(struct shrinker *shrinker,
  60                                     struct shrink_control *sc);
  61
  62 /* some bookkeeping */
  63 static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
  64                                   size_t size)
  65 {
  66         dev_priv->mm.object_count++;
  67         dev_priv->mm.object_memory += size;
  68 }
  69
  70 static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
  71                                      size_t size)
  72 {
  73         dev_priv->mm.object_count--;
  74         dev_priv->mm.object_memory -= size;
  75 }
  76
  77 static int
  78 i915_gem_wait_for_error(struct drm_device *dev)
  79 {
  80         struct drm_i915_private *dev_priv = dev->dev_private;
  81         struct completion *x = &dev_priv->error_completion;
  82         unsigned long flags;
  83         int ret;
  84
  85         if (!atomic_read(&dev_priv->mm.wedged))
  86                 return 0;
  87
  88         ret = wait_for_completion_interruptible(x);
  89         if (ret)
  90                 return ret;
  91
  92         if (atomic_read(&dev_priv->mm.wedged)) {
  93                 /* GPU is hung, bump the completion count to account for
  94                  * the token we just consumed so that we never hit zero and
  95                  * end up waiting upon a subsequent completion event that
  96                  * will never happen.
  97                  */
  98                 spin_lock_irqsave(&x->wait.lock, flags);
  99                 x->done++;
 100                 spin_unlock_irqrestore(&x->wait.lock, flags);
 101         }
 102         return 0;
 103 }
 104
 105 int i915_mutex_lock_interruptible(struct drm_device *dev)
 106 {
 107         int ret;
 108
 109         ret = i915_gem_wait_for_error(dev);
 110         if (ret)
 111                 return ret;
 112
 113         ret = mutex_lock_interruptible(&dev->struct_mutex);
 114         if (ret)
 115                 return ret;
 116
 117         WARN_ON(i915_verify_lists(dev));
 118         return 0;
 119 }
 120
 121 static inline bool
 122 i915_gem_object_is_inactive(struct drm_i915_gem_object *obj)
 123 {
 124         return obj->gtt_space && !obj->active && obj->pin_count == 0;
 125 }
 126
 127 void i915_gem_do_init(struct drm_device *dev,
 128                       unsigned long start,
 129                       unsigned long mappable_end,
 130                       unsigned long end)
 131 {
 132         drm_i915_private_t *dev_priv = dev->dev_private;
 133
 134         drm_mm_init(&dev_priv->mm.gtt_space, start, end - start);
 135
 136         dev_priv->mm.gtt_start = start;
 137         dev_priv->mm.gtt_mappable_end = mappable_end;
 138         dev_priv->mm.gtt_end = end;
 139         dev_priv->mm.gtt_total = end - start;
 140         dev_priv->mm.mappable_gtt_total = min(end, mappable_end) - start;
 141
 142         /* Take over this portion of the GTT */
 143         intel_gtt_clear_range(start / PAGE_SIZE, (end-start) / PAGE_SIZE);
 144 }
 145
 146 int
 147 i915_gem_init_ioctl(struct drm_device *dev, void *data,
 148                     struct drm_file *file)
 149 {
 150         struct drm_i915_gem_init *args = data;
 151
 152         if (args->gtt_start >= args->gtt_end ||
 153             (args->gtt_end | args->gtt_start) & (PAGE_SIZE - 1))
 154                 return -EINVAL;
 155
 156         mutex_lock(&dev->struct_mutex);
 157         i915_gem_do_init(dev, args->gtt_start, args->gtt_end, args->gtt_end);
 158         mutex_unlock(&dev->struct_mutex);
 159
 160         return 0;
 161 }
 162
 163 int
 164 i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
 165                             struct drm_file *file)
 166 {
 167         struct drm_i915_private *dev_priv = dev->dev_private;
 168         struct drm_i915_gem_get_aperture *args = data;
 169         struct drm_i915_gem_object *obj;
 170         size_t pinned;
 171
 172         if (!(dev->driver->driver_features & DRIVER_GEM))
 173                 return -ENODEV;
 174
 175         pinned = 0;
 176         mutex_lock(&dev->struct_mutex);
 177         list_for_each_entry(obj, &dev_priv->mm.pinned_list, mm_list)
 178                 pinned += obj->gtt_space->size;
 179         mutex_unlock(&dev->struct_mutex);
 180
 181         args->aper_size = dev_priv->mm.gtt_total;
 182         args->aper_available_size = args->aper_size -pinned;
 183
 184         return 0;
 185 }
 186
 187 static int
 188 i915_gem_create(struct drm_file *file,
 189                 struct drm_device *dev,
 190                 uint64_t size,
 191                 uint32_t *handle_p)
 192 {
 193         struct drm_i915_gem_object *obj;
 194         int ret;
 195         u32 handle;
 196
 197         size = roundup(size, PAGE_SIZE);
 198
 199         /* Allocate the new object */
 200         obj = i915_gem_alloc_object(dev, size);
 201         if (obj == NULL)
 202                 return -ENOMEM;
 203
 204         ret = drm_gem_handle_create(file, &obj->base, &handle);
 205         if (ret) {
 206                 drm_gem_object_release(&obj->base);
 207                 i915_gem_info_remove_obj(dev->dev_private, obj->base.size);
 208                 kfree(obj);
 209                 return ret;
 210         }
 211
 212         /* drop reference from allocate - handle holds it now */
 213         drm_gem_object_unreference(&obj->base);
 214         trace_i915_gem_object_create(obj);
 215
 216         *handle_p = handle;
 217         return 0;
 218 }
 219
 220 int
 221 i915_gem_dumb_create(struct drm_file *file,
 222                      struct drm_device *dev,
 223                      struct drm_mode_create_dumb *args)
 224 {
 225         /* have to work out size/pitch and return them */
 226         args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
 227         args->size = args->pitch * args->height;
 228         return i915_gem_create(file, dev,
 229                                args->size, &args->handle);
 230 }
 231
 232 int i915_gem_dumb_destroy(struct drm_file *file,
 233                           struct drm_device *dev,
 234                           uint32_t handle)
 235 {
 236         return drm_gem_handle_delete(file, handle);
 237 }
 238
 239 /**
 240  * Creates a new mm object and returns a handle to it.
 241  */
 242 int
 243 i915_gem_create_ioctl(struct drm_device *dev, void *data,
 244                       struct drm_file *file)
 245 {
 246         struct drm_i915_gem_create *args = data;
 247         return i915_gem_create(file, dev,
 248                                args->size, &args->handle);
 249 }
 250
 251 static int i915_gem_object_needs_bit17_swizzle(struct drm_i915_gem_object *obj)
 252 {
 253         drm_i915_private_t *dev_priv = obj->base.dev->dev_private;
 254
 255         return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
 256                 obj->tiling_mode != I915_TILING_NONE;
 257 }
 258
 259 static inline void
 260 slow_shmem_copy(struct page *dst_page,
 261                 int dst_offset,
 262                 struct page *src_page,
 263                 int src_offset,
 264                 int length)
 265 {
 266         char *dst_vaddr, *src_vaddr;
 267
 268         dst_vaddr = kmap(dst_page);
 269         src_vaddr = kmap(src_page);
 270
 271         memcpy(dst_vaddr + dst_offset, src_vaddr + src_offset, length);
 272
 273         kunmap(src_page);
 274         kunmap(dst_page);
 275 }
 276
 277 static inline void
 278 slow_shmem_bit17_copy(struct page *gpu_page,
 279                       int gpu_offset,
 280                       struct page *cpu_page,
 281                       int cpu_offset,
 282                       int length,
 283                       int is_read)
 284 {
 285         char *gpu_vaddr, *cpu_vaddr;
 286
 287         /* Use the unswizzled path if this page isn't affected. */
 288         if ((page_to_phys(gpu_page) & (1 << 17)) == 0) {
 289                 if (is_read)
 290                         return slow_shmem_copy(cpu_page, cpu_offset,
 291                                                gpu_page, gpu_offset, length);
 292                 else
 293                         return slow_shmem_copy(gpu_page, gpu_offset,
 294                                                cpu_page, cpu_offset, length);
 295         }
 296
 297         gpu_vaddr = kmap(gpu_page);
 298         cpu_vaddr = kmap(cpu_page);
 299
 300         /* Copy the data, XORing A6 with A17 (1). The user already knows he's
 301          * XORing with the other bits (A9 for Y, A9 and A10 for X)
 302          */
 303         while (length > 0) {
 304                 int cacheline_end = ALIGN(gpu_offset + 1, 64);
 305                 int this_length = min(cacheline_end - gpu_offset, length);
 306                 int swizzled_gpu_offset = gpu_offset ^ 64;
 307
 308                 if (is_read) {
 309                         memcpy(cpu_vaddr + cpu_offset,
 310                                gpu_vaddr + swizzled_gpu_offset,
 311                                this_length);
 312                 } else {
 313                         memcpy(gpu_vaddr + swizzled_gpu_offset,
 314                                cpu_vaddr + cpu_offset,
 315                                this_length);
 316                 }
 317                 cpu_offset += this_length;
 318                 gpu_offset += this_length;
 319                 length -= this_length;
 320         }
 321
 322         kunmap(cpu_page);
 323         kunmap(gpu_page);
 324 }
 325
 326 /**
 327  * This is the fast shmem pread path, which attempts to copy_from_user directly
 328  * from the backing pages of the object to the user's address space.  On a
 329  * fault, it fails so we can fall back to i915_gem_shmem_pwrite_slow().
 330  */
 331 static int
 332 i915_gem_shmem_pread_fast(struct drm_device *dev,
 333                           struct drm_i915_gem_object *obj,
 334                           struct drm_i915_gem_pread *args,
 335                           struct drm_file *file)
 336 {
 337         struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
 338         ssize_t remain;
 339         loff_t offset;
 340         char __user *user_data;
 341         int page_offset, page_length;
 342
 343         user_data = (char __user *) (uintptr_t) args->data_ptr;
 344         remain = args->size;
 345
 346         offset = args->offset;
 347
 348         while (remain > 0) {
 349                 struct page *page;
 350                 char *vaddr;
 351                 int ret;
 352
 353                 /* Operation in this page
 354                  *
 355                  * page_offset = offset within page
 356                  * page_length = bytes to copy for this page
 357                  */
 358                 page_offset = offset_in_page(offset);
 359                 page_length = remain;
 360                 if ((page_offset + remain) > PAGE_SIZE)
 361                         page_length = PAGE_SIZE - page_offset;
 362
 363                 page = shmem_read_mapping_page(mapping, offset >> PAGE_SHIFT);
 364                 if (IS_ERR(page))
 365                         return PTR_ERR(page);
 366
 367                 vaddr = kmap_atomic(page);
 368                 ret = __copy_to_user_inatomic(user_data,
 369                                               vaddr + page_offset,
 370                                               page_length);
 371                 kunmap_atomic(vaddr);
 372
 373                 mark_page_accessed(page);
 374                 page_cache_release(page);
 375                 if (ret)
 376                         return -EFAULT;
 377
 378                 remain -= page_length;
 379                 user_data += page_length;
 380                 offset += page_length;
 381         }
 382
 383         return 0;
 384 }
 385
 386 /**
 387  * This is the fallback shmem pread path, which allocates temporary storage
 388  * in kernel space to copy_to_user into outside of the struct_mutex, so we
 389  * can copy out of the object's backing pages while holding the struct mutex
 390  * and not take page faults.
 391  */
 392 static int
 393 i915_gem_shmem_pread_slow(struct drm_device *dev,
 394                           struct drm_i915_gem_object *obj,
 395                           struct drm_i915_gem_pread *args,
 396                           struct drm_file *file)
 397 {
 398         struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
 399         struct mm_struct *mm = current->mm;
 400         struct page **user_pages;
 401         ssize_t remain;
 402         loff_t offset, pinned_pages, i;
 403         loff_t first_data_page, last_data_page, num_pages;
 404         int shmem_page_offset;
 405         int data_page_index, data_page_offset;
 406         int page_length;
 407         int ret;
 408         uint64_t data_ptr = args->data_ptr;
 409         int do_bit17_swizzling;
 410
 411         remain = args->size;
 412
 413         /* Pin the user pages containing the data.  We can't fault while
 414          * holding the struct mutex, yet we want to hold it while
 415          * dereferencing the user data.
 416          */
 417         first_data_page = data_ptr / PAGE_SIZE;
 418         last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
 419         num_pages = last_data_page - first_data_page + 1;
 420
 421         user_pages = drm_malloc_ab(num_pages, sizeof(struct page *));
 422         if (user_pages == NULL)
 423                 return -ENOMEM;
 424
 425         mutex_unlock(&dev->struct_mutex);
 426         down_read(&mm->mmap_sem);
 427         pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
 428                                       num_pages, 1, 0, user_pages, NULL);
 429         up_read(&mm->mmap_sem);
 430         mutex_lock(&dev->struct_mutex);
 431         if (pinned_pages < num_pages) {
 432                 ret = -EFAULT;
 433                 goto out;
 434         }
 435
 436         ret = i915_gem_object_set_cpu_read_domain_range(obj,
 437                                                         args->offset,
 438                                                         args->size);
 439         if (ret)
 440                 goto out;
 441
 442         do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
 443
 444         offset = args->offset;
 445
 446         while (remain > 0) {
 447                 struct page *page;
 448
 449                 /* Operation in this page
 450                  *
 451                  * shmem_page_offset = offset within page in shmem file
 452                  * data_page_index = page number in get_user_pages return
 453                  * data_page_offset = offset with data_page_index page.
 454                  * page_length = bytes to copy for this page
 455                  */
 456                 shmem_page_offset = offset_in_page(offset);
 457                 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
 458                 data_page_offset = offset_in_page(data_ptr);
 459
 460                 page_length = remain;
 461                 if ((shmem_page_offset + page_length) > PAGE_SIZE)
 462                         page_length = PAGE_SIZE - shmem_page_offset;
 463                 if ((data_page_offset + page_length) > PAGE_SIZE)
 464                         page_length = PAGE_SIZE - data_page_offset;
 465
 466                 page = shmem_read_mapping_page(mapping, offset >> PAGE_SHIFT);
 467                 if (IS_ERR(page)) {
 468                         ret = PTR_ERR(page);
 469                         goto out;
 470                 }
 471
 472                 if (do_bit17_swizzling) {
 473                         slow_shmem_bit17_copy(page,
 474                                               shmem_page_offset,
 475                                               user_pages[data_page_index],
 476                                               data_page_offset,
 477                                               page_length,
 478                                               1);
 479                 } else {
 480                         slow_shmem_copy(user_pages[data_page_index],
 481                                         data_page_offset,
 482                                         page,
 483                                         shmem_page_offset,
 484                                         page_length);
 485                 }
 486
 487                 mark_page_accessed(page);
 488                 page_cache_release(page);
 489
 490                 remain -= page_length;
 491                 data_ptr += page_length;
 492                 offset += page_length;
 493         }
 494
 495 out:
 496         for (i = 0; i < pinned_pages; i++) {
 497                 SetPageDirty(user_pages[i]);
 498                 mark_page_accessed(user_pages[i]);
 499                 page_cache_release(user_pages[i]);
 500         }
 501         drm_free_large(user_pages);
 502
 503         return ret;
 504 }
 505
 506 /**
 507  * Reads data from the object referenced by handle.
 508  *
 509  * On error, the contents of *data are undefined.
 510  */
 511 int
 512 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
 513                      struct drm_file *file)
 514 {
 515         struct drm_i915_gem_pread *args = data;
 516         struct drm_i915_gem_object *obj;
 517         int ret = 0;
 518
 519         if (args->size == 0)
 520                 return 0;
 521
 522         if (!access_ok(VERIFY_WRITE,
 523                        (char __user *)(uintptr_t)args->data_ptr,
 524                        args->size))
 525                 return -EFAULT;
 526
 527         ret = fault_in_pages_writeable((char __user *)(uintptr_t)args->data_ptr,
 528                                        args->size);
 529         if (ret)
 530                 return -EFAULT;
 531
 532         ret = i915_mutex_lock_interruptible(dev);
 533         if (ret)
 534                 return ret;
 535
 536         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
 537         if (&obj->base == NULL) {
 538                 ret = -ENOENT;
 539                 goto unlock;
 540         }
 541
 542         /* Bounds check source.  */
 543         if (args->offset > obj->base.size ||
 544             args->size > obj->base.size - args->offset) {
 545                 ret = -EINVAL;
 546                 goto out;
 547         }
 548
 549         trace_i915_gem_object_pread(obj, args->offset, args->size);
 550
 551         ret = i915_gem_object_set_cpu_read_domain_range(obj,
 552                                                         args->offset,
 553                                                         args->size);
 554         if (ret)
 555                 goto out;
 556
 557         ret = -EFAULT;
 558         if (!i915_gem_object_needs_bit17_swizzle(obj))
 559                 ret = i915_gem_shmem_pread_fast(dev, obj, args, file);
 560         if (ret == -EFAULT)
 561                 ret = i915_gem_shmem_pread_slow(dev, obj, args, file);
 562
 563 out:
 564         drm_gem_object_unreference(&obj->base);
 565 unlock:
 566         mutex_unlock(&dev->struct_mutex);
 567         return ret;
 568 }
 569
 570 /* This is the fast write path which cannot handle
 571  * page faults in the source data
 572  */
 573
 574 static inline int
 575 fast_user_write(struct io_mapping *mapping,
 576                 loff_t page_base, int page_offset,
 577                 char __user *user_data,
 578                 int length)
 579 {
 580         char *vaddr_atomic;
 581         unsigned long unwritten;
 582
 583         vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
 584         unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset,
 585                                                       user_data, length);
 586         io_mapping_unmap_atomic(vaddr_atomic);
 587         return unwritten;
 588 }
 589
 590 /* Here's the write path which can sleep for
 591  * page faults
 592  */
 593
 594 static inline void
 595 slow_kernel_write(struct io_mapping *mapping,
 596                   loff_t gtt_base, int gtt_offset,
 597                   struct page *user_page, int user_offset,
 598                   int length)
 599 {
 600         char __iomem *dst_vaddr;
 601         char *src_vaddr;
 602
 603         dst_vaddr = io_mapping_map_wc(mapping, gtt_base);
 604         src_vaddr = kmap(user_page);
 605
 606         memcpy_toio(dst_vaddr + gtt_offset,
 607                     src_vaddr + user_offset,
 608                     length);
 609
 610         kunmap(user_page);
 611         io_mapping_unmap(dst_vaddr);
 612 }
 613
 614 /**
 615  * This is the fast pwrite path, where we copy the data directly from the
 616  * user into the GTT, uncached.
 617  */
 618 static int
 619 i915_gem_gtt_pwrite_fast(struct drm_device *dev,
 620                          struct drm_i915_gem_object *obj,
 621                          struct drm_i915_gem_pwrite *args,
 622                          struct drm_file *file)
 623 {
 624         drm_i915_private_t *dev_priv = dev->dev_private;
 625         ssize_t remain;
 626         loff_t offset, page_base;
 627         char __user *user_data;
 628         int page_offset, page_length;
 629
 630         user_data = (char __user *) (uintptr_t) args->data_ptr;
 631         remain = args->size;
 632
 633         offset = obj->gtt_offset + args->offset;
 634
 635         while (remain > 0) {
 636                 /* Operation in this page
 637                  *
 638                  * page_base = page offset within aperture
 639                  * page_offset = offset within page
 640                  * page_length = bytes to copy for this page
 641                  */
 642                 page_base = offset & PAGE_MASK;
 643                 page_offset = offset_in_page(offset);
 644                 page_length = remain;
 645                 if ((page_offset + remain) > PAGE_SIZE)
 646                         page_length = PAGE_SIZE - page_offset;
 647
 648                 /* If we get a fault while copying data, then (presumably) our
 649                  * source page isn't available.  Return the error and we'll
 650                  * retry in the slow path.
 651                  */
 652                 if (fast_user_write(dev_priv->mm.gtt_mapping, page_base,
 653                                     page_offset, user_data, page_length))
 654                         return -EFAULT;
 655
 656                 remain -= page_length;
 657                 user_data += page_length;
 658                 offset += page_length;
 659         }
 660
 661         return 0;
 662 }
 663
 664 /**
 665  * This is the fallback GTT pwrite path, which uses get_user_pages to pin
 666  * the memory and maps it using kmap_atomic for copying.
 667  *
 668  * This code resulted in x11perf -rgb10text consuming about 10% more CPU
 669  * than using i915_gem_gtt_pwrite_fast on a G45 (32-bit).
 670  */
 671 static int
 672 i915_gem_gtt_pwrite_slow(struct drm_device *dev,
 673                          struct drm_i915_gem_object *obj,
 674                          struct drm_i915_gem_pwrite *args,
 675                          struct drm_file *file)
 676 {
 677         drm_i915_private_t *dev_priv = dev->dev_private;
 678         ssize_t remain;
 679         loff_t gtt_page_base, offset;
 680         loff_t first_data_page, last_data_page, num_pages;
 681         loff_t pinned_pages, i;
 682         struct page **user_pages;
 683         struct mm_struct *mm = current->mm;
 684         int gtt_page_offset, data_page_offset, data_page_index, page_length;
 685         int ret;
 686         uint64_t data_ptr = args->data_ptr;
 687
 688         remain = args->size;
 689
 690         /* Pin the user pages containing the data.  We can't fault while
 691          * holding the struct mutex, and all of the pwrite implementations
 692          * want to hold it while dereferencing the user data.
 693          */
 694         first_data_page = data_ptr / PAGE_SIZE;
 695         last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
 696         num_pages = last_data_page - first_data_page + 1;
 697
 698         user_pages = drm_malloc_ab(num_pages, sizeof(struct page *));
 699         if (user_pages == NULL)
 700                 return -ENOMEM;
 701
 702         mutex_unlock(&dev->struct_mutex);
 703         down_read(&mm->mmap_sem);
 704         pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
 705                                       num_pages, 0, 0, user_pages, NULL);
 706         up_read(&mm->mmap_sem);
 707         mutex_lock(&dev->struct_mutex);
 708         if (pinned_pages < num_pages) {
 709                 ret = -EFAULT;
 710                 goto out_unpin_pages;
 711         }
 712
 713         ret = i915_gem_object_set_to_gtt_domain(obj, true);
 714         if (ret)
 715                 goto out_unpin_pages;
 716
 717         ret = i915_gem_object_put_fence(obj);
 718         if (ret)
 719                 goto out_unpin_pages;
 720
 721         offset = obj->gtt_offset + args->offset;
 722
 723         while (remain > 0) {
 724                 /* Operation in this page
 725                  *
 726                  * gtt_page_base = page offset within aperture
 727                  * gtt_page_offset = offset within page in aperture
 728                  * data_page_index = page number in get_user_pages return
 729                  * data_page_offset = offset with data_page_index page.
 730                  * page_length = bytes to copy for this page
 731                  */
 732                 gtt_page_base = offset & PAGE_MASK;
 733                 gtt_page_offset = offset_in_page(offset);
 734                 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
 735                 data_page_offset = offset_in_page(data_ptr);
 736
 737                 page_length = remain;
 738                 if ((gtt_page_offset + page_length) > PAGE_SIZE)
 739                         page_length = PAGE_SIZE - gtt_page_offset;
 740                 if ((data_page_offset + page_length) > PAGE_SIZE)
 741                         page_length = PAGE_SIZE - data_page_offset;
 742
 743                 slow_kernel_write(dev_priv->mm.gtt_mapping,
 744                                   gtt_page_base, gtt_page_offset,
 745                                   user_pages[data_page_index],
 746                                   data_page_offset,
 747                                   page_length);
 748
 749                 remain -= page_length;
 750                 offset += page_length;
 751                 data_ptr += page_length;
 752         }
 753
 754 out_unpin_pages:
 755         for (i = 0; i < pinned_pages; i++)
 756                 page_cache_release(user_pages[i]);
 757         drm_free_large(user_pages);
 758
 759         return ret;
 760 }
 761
 762 /**
 763  * This is the fast shmem pwrite path, which attempts to directly
 764  * copy_from_user into the kmapped pages backing the object.
 765  */
 766 static int
 767 i915_gem_shmem_pwrite_fast(struct drm_device *dev,
 768                            struct drm_i915_gem_object *obj,
 769                            struct drm_i915_gem_pwrite *args,
 770                            struct drm_file *file)
 771 {
 772         struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
 773         ssize_t remain;
 774         loff_t offset;
 775         char __user *user_data;
 776         int page_offset, page_length;
 777
 778         user_data = (char __user *) (uintptr_t) args->data_ptr;
 779         remain = args->size;
 780
 781         offset = args->offset;
 782         obj->dirty = 1;
 783
 784         while (remain > 0) {
 785                 struct page *page;
 786                 char *vaddr;
 787                 int ret;
 788
 789                 /* Operation in this page
 790                  *
 791                  * page_offset = offset within page
 792                  * page_length = bytes to copy for this page
 793                  */
 794                 page_offset = offset_in_page(offset);
 795                 page_length = remain;
 796                 if ((page_offset + remain) > PAGE_SIZE)
 797                         page_length = PAGE_SIZE - page_offset;
 798
 799                 page = shmem_read_mapping_page(mapping, offset >> PAGE_SHIFT);
 800                 if (IS_ERR(page))
 801                         return PTR_ERR(page);
 802
 803                 vaddr = kmap_atomic(page, KM_USER0);
 804                 ret = __copy_from_user_inatomic(vaddr + page_offset,
 805                                                 user_data,
 806                                                 page_length);
 807                 kunmap_atomic(vaddr, KM_USER0);
 808
 809                 set_page_dirty(page);
 810                 mark_page_accessed(page);
 811                 page_cache_release(page);
 812
 813                 /* If we get a fault while copying data, then (presumably) our
 814                  * source page isn't available.  Return the error and we'll
 815                  * retry in the slow path.
 816                  */
 817                 if (ret)
 818                         return -EFAULT;
 819
 820                 remain -= page_length;
 821                 user_data += page_length;
 822                 offset += page_length;
 823         }
 824
 825         return 0;
 826 }
 827
 828 /**
 829  * This is the fallback shmem pwrite path, which uses get_user_pages to pin
 830  * the memory and maps it using kmap_atomic for copying.
 831  *
 832  * This avoids taking mmap_sem for faulting on the user's address while the
 833  * struct_mutex is held.
 834  */
 835 static int
 836 i915_gem_shmem_pwrite_slow(struct drm_device *dev,
 837                            struct drm_i915_gem_object *obj,
 838                            struct drm_i915_gem_pwrite *args,
 839                            struct drm_file *file)
 840 {
 841         struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
 842         struct mm_struct *mm = current->mm;
 843         struct page **user_pages;
 844         ssize_t remain;
 845         loff_t offset, pinned_pages, i;
 846         loff_t first_data_page, last_data_page, num_pages;
 847         int shmem_page_offset;
 848         int data_page_index,  data_page_offset;
 849         int page_length;
 850         int ret;
 851         uint64_t data_ptr = args->data_ptr;
 852         int do_bit17_swizzling;
 853
 854         remain = args->size;
 855
 856         /* Pin the user pages containing the data.  We can't fault while
 857          * holding the struct mutex, and all of the pwrite implementations
 858          * want to hold it while dereferencing the user data.
 859          */
 860         first_data_page = data_ptr / PAGE_SIZE;
 861         last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
 862         num_pages = last_data_page - first_data_page + 1;
 863
 864         user_pages = drm_malloc_ab(num_pages, sizeof(struct page *));
 865         if (user_pages == NULL)
 866                 return -ENOMEM;
 867
 868         mutex_unlock(&dev->struct_mutex);
 869         down_read(&mm->mmap_sem);
 870         pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
 871                                       num_pages, 0, 0, user_pages, NULL);
 872         up_read(&mm->mmap_sem);
 873         mutex_lock(&dev->struct_mutex);
 874         if (pinned_pages < num_pages) {
 875                 ret = -EFAULT;
 876                 goto out;
 877         }
 878
 879         ret = i915_gem_object_set_to_cpu_domain(obj, 1);
 880         if (ret)
 881                 goto out;
 882
 883         do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
 884
 885         offset = args->offset;
 886         obj->dirty = 1;
 887
 888         while (remain > 0) {
 889                 struct page *page;
 890
 891                 /* Operation in this page
 892                  *
 893                  * shmem_page_offset = offset within page in shmem file
 894                  * data_page_index = page number in get_user_pages return
 895                  * data_page_offset = offset with data_page_index page.
 896                  * page_length = bytes to copy for this page
 897                  */
 898                 shmem_page_offset = offset_in_page(offset);
 899                 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
 900                 data_page_offset = offset_in_page(data_ptr);
 901
 902                 page_length = remain;
 903                 if ((shmem_page_offset + page_length) > PAGE_SIZE)
 904                         page_length = PAGE_SIZE - shmem_page_offset;
 905                 if ((data_page_offset + page_length) > PAGE_SIZE)
 906                         page_length = PAGE_SIZE - data_page_offset;
 907
 908                 page = shmem_read_mapping_page(mapping, offset >> PAGE_SHIFT);
 909                 if (IS_ERR(page)) {
 910                         ret = PTR_ERR(page);
 911                         goto out;
 912                 }
 913
 914                 if (do_bit17_swizzling) {
 915                         slow_shmem_bit17_copy(page,
 916                                               shmem_page_offset,
 917                                               user_pages[data_page_index],
 918                                               data_page_offset,
 919                                               page_length,
 920                                               0);
 921                 } else {
 922                         slow_shmem_copy(page,
 923                                         shmem_page_offset,
 924                                         user_pages[data_page_index],
 925                                         data_page_offset,
 926                                         page_length);
 927                 }
 928
 929                 set_page_dirty(page);
 930                 mark_page_accessed(page);
 931                 page_cache_release(page);
 932
 933                 remain -= page_length;
 934                 data_ptr += page_length;
 935                 offset += page_length;
 936         }
 937
 938 out:
 939         for (i = 0; i < pinned_pages; i++)
 940                 page_cache_release(user_pages[i]);
 941         drm_free_large(user_pages);
 942
 943         return ret;
 944 }
 945
 946 /**
 947  * Writes data to the object referenced by handle.
 948  *
 949  * On error, the contents of the buffer that were to be modified are undefined.
 950  */
 951 int
 952 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
 953                       struct drm_file *file)
 954 {
 955         struct drm_i915_gem_pwrite *args = data;
 956         struct drm_i915_gem_object *obj;
 957         int ret;
 958
 959         if (args->size == 0)
 960                 return 0;
 961
 962         if (!access_ok(VERIFY_READ,
 963                        (char __user *)(uintptr_t)args->data_ptr,
 964                        args->size))
 965                 return -EFAULT;
 966
 967         ret = fault_in_pages_readable((char __user *)(uintptr_t)args->data_ptr,
 968                                       args->size);
 969         if (ret)
 970                 return -EFAULT;
 971
 972         ret = i915_mutex_lock_interruptible(dev);
 973         if (ret)
 974                 return ret;
 975
 976         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
 977         if (&obj->base == NULL) {
 978                 ret = -ENOENT;
 979                 goto unlock;
 980         }
 981
 982         /* Bounds check destination. */
 983         if (args->offset > obj->base.size ||
 984             args->size > obj->base.size - args->offset) {
 985                 ret = -EINVAL;
 986                 goto out;
 987         }
 988
 989         trace_i915_gem_object_pwrite(obj, args->offset, args->size);
 990
 991         /* We can only do the GTT pwrite on untiled buffers, as otherwise
 992          * it would end up going through the fenced access, and we'll get
 993          * different detiling behavior between reading and writing.
 994          * pread/pwrite currently are reading and writing from the CPU
 995          * perspective, requiring manual detiling by the client.
 996          */
 997         if (obj->phys_obj)
 998                 ret = i915_gem_phys_pwrite(dev, obj, args, file);
 999         else if (obj->gtt_space &&
1000                  obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
1001                 ret = i915_gem_object_pin(obj, 0, true);
1002                 if (ret)
1003                         goto out;
1004
1005                 ret = i915_gem_object_set_to_gtt_domain(obj, true);
1006                 if (ret)
1007                         goto out_unpin;
1008
1009                 ret = i915_gem_object_put_fence(obj);
1010                 if (ret)
1011                         goto out_unpin;
1012
1013                 ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file);
1014                 if (ret == -EFAULT)
1015                         ret = i915_gem_gtt_pwrite_slow(dev, obj, args, file);
1016
1017 out_unpin:
1018                 i915_gem_object_unpin(obj);
1019         } else {
1020                 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
1021                 if (ret)
1022                         goto out;
1023
1024                 ret = -EFAULT;
1025                 if (!i915_gem_object_needs_bit17_swizzle(obj))
1026                         ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file);
1027                 if (ret == -EFAULT)
1028                         ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file);
1029         }
1030
1031 out:
1032         drm_gem_object_unreference(&obj->base);
1033 unlock:
1034         mutex_unlock(&dev->struct_mutex);
1035         return ret;
1036 }
1037
1038 /**
1039  * Called when user space prepares to use an object with the CPU, either
1040  * through the mmap ioctl's mapping or a GTT mapping.
1041  */
1042 int
1043 i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
1044                           struct drm_file *file)
1045 {
1046         struct drm_i915_gem_set_domain *args = data;
1047         struct drm_i915_gem_object *obj;
1048         uint32_t read_domains = args->read_domains;
1049         uint32_t write_domain = args->write_domain;
1050         int ret;
1051
1052         if (!(dev->driver->driver_features & DRIVER_GEM))
1053                 return -ENODEV;
1054
1055         /* Only handle setting domains to types used by the CPU. */
1056         if (write_domain & I915_GEM_GPU_DOMAINS)
1057                 return -EINVAL;
1058
1059         if (read_domains & I915_GEM_GPU_DOMAINS)
1060                 return -EINVAL;
1061
1062         /* Having something in the write domain implies it's in the read
1063          * domain, and only that read domain.  Enforce that in the request.
1064          */
1065         if (write_domain != 0 && read_domains != write_domain)
1066                 return -EINVAL;
1067
1068         ret = i915_mutex_lock_interruptible(dev);
1069         if (ret)
1070                 return ret;
1071
1072         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1073         if (&obj->base == NULL) {
1074                 ret = -ENOENT;
1075                 goto unlock;
1076         }
1077
1078         if (read_domains & I915_GEM_DOMAIN_GTT) {
1079                 ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0);
1080
1081                 /* Silently promote "you're not bound, there was nothing to do"
1082                  * to success, since the client was just asking us to
1083                  * make sure everything was done.
1084                  */
1085                 if (ret == -EINVAL)
1086                         ret = 0;
1087         } else {
1088                 ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0);
1089         }
1090
1091         drm_gem_object_unreference(&obj->base);
1092 unlock:
1093         mutex_unlock(&dev->struct_mutex);
1094         return ret;
1095 }
1096
1097 /**
1098  * Called when user space has done writes to this buffer
1099  */
1100 int
1101 i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
1102                          struct drm_file *file)
1103 {
1104         struct drm_i915_gem_sw_finish *args = data;
1105         struct drm_i915_gem_object *obj;
1106         int ret = 0;
1107
1108         if (!(dev->driver->driver_features & DRIVER_GEM))
1109                 return -ENODEV;
1110
1111         ret = i915_mutex_lock_interruptible(dev);
1112         if (ret)
1113                 return ret;
1114
1115         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1116         if (&obj->base == NULL) {
1117                 ret = -ENOENT;
1118                 goto unlock;
1119         }
1120
1121         /* Pinned buffers may be scanout, so flush the cache */
1122         if (obj->pin_count)
1123                 i915_gem_object_flush_cpu_write_domain(obj);
1124
1125         drm_gem_object_unreference(&obj->base);
1126 unlock:
1127         mutex_unlock(&dev->struct_mutex);
1128         return ret;
1129 }
1130
1131 /**
1132  * Maps the contents of an object, returning the address it is mapped
1133  * into.
1134  *
1135  * While the mapping holds a reference on the contents of the object, it doesn't
1136  * imply a ref on the object itself.
1137  */
1138 int
1139 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
1140                     struct drm_file *file)
1141 {
1142         struct drm_i915_private *dev_priv = dev->dev_private;
1143         struct drm_i915_gem_mmap *args = data;
1144         struct drm_gem_object *obj;
1145         unsigned long addr;
1146
1147         if (!(dev->driver->driver_features & DRIVER_GEM))
1148                 return -ENODEV;
1149
1150         obj = drm_gem_object_lookup(dev, file, args->handle);
1151         if (obj == NULL)
1152                 return -ENOENT;
1153
1154         if (obj->size > dev_priv->mm.gtt_mappable_end) {
1155                 drm_gem_object_unreference_unlocked(obj);
1156                 return -E2BIG;
1157         }
1158
1159         down_write(&current->mm->mmap_sem);
1160         addr = do_mmap(obj->filp, 0, args->size,
1161                        PROT_READ | PROT_WRITE, MAP_SHARED,
1162                        args->offset);
1163         up_write(&current->mm->mmap_sem);
1164         drm_gem_object_unreference_unlocked(obj);
1165         if (IS_ERR((void *)addr))
1166                 return addr;
1167
1168         args->addr_ptr = (uint64_t) addr;
1169
1170         return 0;
1171 }
1172
1173 /**
1174  * i915_gem_fault - fault a page into the GTT
1175  * vma: VMA in question
1176  * vmf: fault info
1177  *
1178  * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
1179  * from userspace.  The fault handler takes care of binding the object to
1180  * the GTT (if needed), allocating and programming a fence register (again,
1181  * only if needed based on whether the old reg is still valid or the object
1182  * is tiled) and inserting a new PTE into the faulting process.
1183  *
1184  * Note that the faulting process may involve evicting existing objects
1185  * from the GTT and/or fence registers to make room.  So performance may
1186  * suffer if the GTT working set is large or there are few fence registers
1187  * left.
1188  */
1189 int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1190 {
1191         struct drm_i915_gem_object *obj = to_intel_bo(vma->vm_private_data);
1192         struct drm_device *dev = obj->base.dev;
1193         drm_i915_private_t *dev_priv = dev->dev_private;
1194         pgoff_t page_offset;
1195         unsigned long pfn;
1196         int ret = 0;
1197         bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
1198
1199         /* We don't use vmf->pgoff since that has the fake offset */
1200         page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
1201                 PAGE_SHIFT;
1202
1203         ret = i915_mutex_lock_interruptible(dev);
1204         if (ret)
1205                 goto out;
1206
1207         trace_i915_gem_object_fault(obj, page_offset, true, write);
1208
1209         /* Now bind it into the GTT if needed */
1210         if (!obj->map_and_fenceable) {
1211                 ret = i915_gem_object_unbind(obj);
1212                 if (ret)
1213                         goto unlock;
1214         }
1215         if (!obj->gtt_space) {
1216                 ret = i915_gem_object_bind_to_gtt(obj, 0, true);
1217                 if (ret)
1218                         goto unlock;
1219
1220                 ret = i915_gem_object_set_to_gtt_domain(obj, write);
1221                 if (ret)
1222                         goto unlock;
1223         }
1224
1225         if (obj->tiling_mode == I915_TILING_NONE)
1226                 ret = i915_gem_object_put_fence(obj);
1227         else
1228                 ret = i915_gem_object_get_fence(obj, NULL);
1229         if (ret)
1230                 goto unlock;
1231
1232         if (i915_gem_object_is_inactive(obj))
1233                 list_move_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
1234
1235         obj->fault_mappable = true;
1236
1237         pfn = ((dev->agp->base + obj->gtt_offset) >> PAGE_SHIFT) +
1238                 page_offset;
1239
1240         /* Finally, remap it using the new GTT offset */
1241         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
1242 unlock:
1243         mutex_unlock(&dev->struct_mutex);
1244 out:
1245         switch (ret) {
1246         case -EIO:
1247         case -EAGAIN:
1248                 /* Give the error handler a chance to run and move the
1249                  * objects off the GPU active list. Next time we service the
1250                  * fault, we should be able to transition the page into the
1251                  * GTT without touching the GPU (and so avoid further
1252                  * EIO/EGAIN). If the GPU is wedged, then there is no issue
1253                  * with coherency, just lost writes.
1254                  */
1255                 set_need_resched();
1256         case 0:
1257         case -ERESTARTSYS:
1258         case -EINTR:
1259                 return VM_FAULT_NOPAGE;
1260         case -ENOMEM:
1261                 return VM_FAULT_OOM;
1262         default:
1263                 return VM_FAULT_SIGBUS;
1264         }
1265 }
1266
1267 /**
1268  * i915_gem_create_mmap_offset - create a fake mmap offset for an object
1269  * @obj: obj in question
1270  *
1271  * GEM memory mapping works by handing back to userspace a fake mmap offset
1272  * it can use in a subsequent mmap(2) call.  The DRM core code then looks
1273  * up the object based on the offset and sets up the various memory mapping
1274  * structures.
1275  *
1276  * This routine allocates and attaches a fake offset for @obj.
1277  */
1278 static int
1279 i915_gem_create_mmap_offset(struct drm_i915_gem_object *obj)
1280 {
1281         struct drm_device *dev = obj->base.dev;
1282         struct drm_gem_mm *mm = dev->mm_private;
1283         struct drm_map_list *list;
1284         struct drm_local_map *map;
1285         int ret = 0;
1286
1287         /* Set the object up for mmap'ing */
1288         list = &obj->base.map_list;
1289         list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
1290         if (!list->map)
1291                 return -ENOMEM;
1292
1293         map = list->map;
1294         map->type = _DRM_GEM;
1295         map->size = obj->base.size;
1296         map->handle = obj;
1297
1298         /* Get a DRM GEM mmap offset allocated... */
1299         list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
1300                                                     obj->base.size / PAGE_SIZE,
1301                                                     0, 0);
1302         if (!list->file_offset_node) {
1303                 DRM_ERROR("failed to allocate offset for bo %d\n",
1304                           obj->base.name);
1305                 ret = -ENOSPC;
1306                 goto out_free_list;
1307         }
1308
1309         list->file_offset_node = drm_mm_get_block(list->file_offset_node,
1310                                                   obj->base.size / PAGE_SIZE,
1311                                                   0);
1312         if (!list->file_offset_node) {
1313                 ret = -ENOMEM;
1314                 goto out_free_list;
1315         }
1316
1317         list->hash.key = list->file_offset_node->start;
1318         ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
1319         if (ret) {
1320                 DRM_ERROR("failed to add to map hash\n");
1321                 goto out_free_mm;
1322         }
1323
1324         return 0;
1325
1326 out_free_mm:
1327         drm_mm_put_block(list->file_offset_node);
1328 out_free_list:
1329         kfree(list->map);
1330         list->map = NULL;
1331
1332         return ret;
1333 }
1334
1335 /**
1336  * i915_gem_release_mmap - remove physical page mappings
1337  * @obj: obj in question
1338  *
1339  * Preserve the reservation of the mmapping with the DRM core code, but
1340  * relinquish ownership of the pages back to the system.
1341  *
1342  * It is vital that we remove the page mapping if we have mapped a tiled
1343  * object through the GTT and then lose the fence register due to
1344  * resource pressure. Similarly if the object has been moved out of the
1345  * aperture, than pages mapped into userspace must be revoked. Removing the
1346  * mapping will then trigger a page fault on the next user access, allowing
1347  * fixup by i915_gem_fault().
1348  */
1349 void
1350 i915_gem_release_mmap(struct drm_i915_gem_object *obj)
1351 {
1352         if (!obj->fault_mappable)
1353                 return;
1354
1355         if (obj->base.dev->dev_mapping)
1356                 unmap_mapping_range(obj->base.dev->dev_mapping,
1357                                     (loff_t)obj->base.map_list.hash.key<<PAGE_SHIFT,
1358                                     obj->base.size, 1);
1359
1360         obj->fault_mappable = false;
1361 }
1362
1363 static void
1364 i915_gem_free_mmap_offset(struct drm_i915_gem_object *obj)
1365 {
1366         struct drm_device *dev = obj->base.dev;
1367         struct drm_gem_mm *mm = dev->mm_private;
1368         struct drm_map_list *list = &obj->base.map_list;
1369
1370         drm_ht_remove_item(&mm->offset_hash, &list->hash);
1371         drm_mm_put_block(list->file_offset_node);
1372         kfree(list->map);
1373         list->map = NULL;
1374 }
1375
1376 static uint32_t
1377 i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode)
1378 {
1379         uint32_t gtt_size;
1380
1381         if (INTEL_INFO(dev)->gen >= 4 ||
1382             tiling_mode == I915_TILING_NONE)
1383                 return size;
1384
1385         /* Previous chips need a power-of-two fence region when tiling */
1386         if (INTEL_INFO(dev)->gen == 3)
1387                 gtt_size = 1024*1024;
1388         else
1389                 gtt_size = 512*1024;
1390
1391         while (gtt_size < size)
1392                 gtt_size <<= 1;
1393
1394         return gtt_size;
1395 }
1396
1397 /**
1398  * i915_gem_get_gtt_alignment - return required GTT alignment for an object
1399  * @obj: object to check
1400  *
1401  * Return the required GTT alignment for an object, taking into account
1402  * potential fence register mapping.
1403  */
1404 static uint32_t
1405 i915_gem_get_gtt_alignment(struct drm_device *dev,
1406                            uint32_t size,
1407                            int tiling_mode)
1408 {
1409         /*
1410          * Minimum alignment is 4k (GTT page size), but might be greater
1411          * if a fence register is needed for the object.
1412          */
1413         if (INTEL_INFO(dev)->gen >= 4 ||
1414             tiling_mode == I915_TILING_NONE)
1415                 return 4096;
1416
1417         /*
1418          * Previous chips need to be aligned to the size of the smallest
1419          * fence register that can contain the object.
1420          */
1421         return i915_gem_get_gtt_size(dev, size, tiling_mode);
1422 }
1423
1424 /**
1425  * i915_gem_get_unfenced_gtt_alignment - return required GTT alignment for an
1426  *                                       unfenced object
1427  * @dev: the device
1428  * @size: size of the object
1429  * @tiling_mode: tiling mode of the object
1430  *
1431  * Return the required GTT alignment for an object, only taking into account
1432  * unfenced tiled surface requirements.
1433  */
1434 uint32_t
1435 i915_gem_get_unfenced_gtt_alignment(struct drm_device *dev,
1436                                     uint32_t size,
1437                                     int tiling_mode)
1438 {
1439         /*
1440          * Minimum alignment is 4k (GTT page size) for sane hw.
1441          */
1442         if (INTEL_INFO(dev)->gen >= 4 || IS_G33(dev) ||
1443             tiling_mode == I915_TILING_NONE)
1444                 return 4096;
1445
1446         /* Previous hardware however needs to be aligned to a power-of-two
1447          * tile height. The simplest method for determining this is to reuse
1448          * the power-of-tile object size.
1449          */
1450         return i915_gem_get_gtt_size(dev, size, tiling_mode);
1451 }
1452
1453 int
1454 i915_gem_mmap_gtt(struct drm_file *file,
1455                   struct drm_device *dev,
1456                   uint32_t handle,
1457                   uint64_t *offset)
1458 {
1459         struct drm_i915_private *dev_priv = dev->dev_private;
1460         struct drm_i915_gem_object *obj;
1461         int ret;
1462
1463         if (!(dev->driver->driver_features & DRIVER_GEM))
1464                 return -ENODEV;
1465
1466         ret = i915_mutex_lock_interruptible(dev);
1467         if (ret)
1468                 return ret;
1469
1470         obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
1471         if (&obj->base == NULL) {
1472                 ret = -ENOENT;
1473                 goto unlock;
1474         }
1475
1476         if (obj->base.size > dev_priv->mm.gtt_mappable_end) {
1477                 ret = -E2BIG;
1478                 goto unlock;
1479         }
1480
1481         if (obj->madv != I915_MADV_WILLNEED) {
1482                 DRM_ERROR("Attempting to mmap a purgeable buffer\n");
1483                 ret = -EINVAL;
1484                 goto out;
1485         }
1486
1487         if (!obj->base.map_list.map) {
1488                 ret = i915_gem_create_mmap_offset(obj);
1489                 if (ret)
1490                         goto out;
1491         }
1492
1493         *offset = (u64)obj->base.map_list.hash.key << PAGE_SHIFT;
1494
1495 out:
1496         drm_gem_object_unreference(&obj->base);
1497 unlock:
1498         mutex_unlock(&dev->struct_mutex);
1499         return ret;
1500 }
1501
1502 /**
1503  * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
1504  * @dev: DRM device
1505  * @data: GTT mapping ioctl data
1506  * @file: GEM object info
1507  *
1508  * Simply returns the fake offset to userspace so it can mmap it.
1509  * The mmap call will end up in drm_gem_mmap(), which will set things
1510  * up so we can get faults in the handler above.
1511  *
1512  * The fault handler will take care of binding the object into the GTT
1513  * (since it may have been evicted to make room for something), allocating
1514  * a fence register, and mapping the appropriate aperture address into
1515  * userspace.
1516  */
1517 int
1518 i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
1519                         struct drm_file *file)
1520 {
1521         struct drm_i915_gem_mmap_gtt *args = data;
1522
1523         if (!(dev->driver->driver_features & DRIVER_GEM))
1524                 return -ENODEV;
1525
1526         return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
1527 }
1528
1529
1530 static int
1531 i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj,
1532                               gfp_t gfpmask)
1533 {
1534         int page_count, i;
1535         struct address_space *mapping;
1536         struct inode *inode;
1537         struct page *page;
1538
1539         /* Get the list of pages out of our struct file.  They'll be pinned
1540          * at this point until we release them.
1541          */
1542         page_count = obj->base.size / PAGE_SIZE;
1543         BUG_ON(obj->pages != NULL);
1544         obj->pages = drm_malloc_ab(page_count, sizeof(struct page *));
1545         if (obj->pages == NULL)
1546                 return -ENOMEM;
1547
1548         inode = obj->base.filp->f_path.dentry->d_inode;
1549         mapping = inode->i_mapping;
1550         gfpmask |= mapping_gfp_mask(mapping);
1551
1552         for (i = 0; i < page_count; i++) {
1553                 page = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
1554                 if (IS_ERR(page))
1555                         goto err_pages;
1556
1557                 obj->pages[i] = page;
1558         }
1559
1560         if (obj->tiling_mode != I915_TILING_NONE)
1561                 i915_gem_object_do_bit_17_swizzle(obj);
1562
1563         return 0;
1564
1565 err_pages:
1566         while (i--)
1567                 page_cache_release(obj->pages[i]);
1568
1569         drm_free_large(obj->pages);
1570         obj->pages = NULL;
1571         return PTR_ERR(page);
1572 }
1573
1574 static void
1575 i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj)
1576 {
1577         int page_count = obj->base.size / PAGE_SIZE;
1578         int i;
1579
1580         BUG_ON(obj->madv == __I915_MADV_PURGED);
1581
1582         if (obj->tiling_mode != I915_TILING_NONE)
1583                 i915_gem_object_save_bit_17_swizzle(obj);
1584
1585         if (obj->madv == I915_MADV_DONTNEED)
1586                 obj->dirty = 0;
1587
1588         for (i = 0; i < page_count; i++) {
1589                 if (obj->dirty)
1590                         set_page_dirty(obj->pages[i]);
1591
1592                 if (obj->madv == I915_MADV_WILLNEED)
1593                         mark_page_accessed(obj->pages[i]);
1594
1595                 page_cache_release(obj->pages[i]);
1596         }
1597         obj->dirty = 0;
1598
1599         drm_free_large(obj->pages);
1600         obj->pages = NULL;
1601 }
1602
1603 void
1604 i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
1605                                struct intel_ring_buffer *ring,
1606                                u32 seqno)
1607 {
1608         struct drm_device *dev = obj->base.dev;
1609         struct drm_i915_private *dev_priv = dev->dev_private;
1610
1611         BUG_ON(ring == NULL);
1612         obj->ring = ring;
1613
1614         /* Add a reference if we're newly entering the active list. */
1615         if (!obj->active) {
1616                 drm_gem_object_reference(&obj->base);
1617                 obj->active = 1;
1618         }
1619
1620         /* Move from whatever list we were on to the tail of execution. */
1621         list_move_tail(&obj->mm_list, &dev_priv->mm.active_list);
1622         list_move_tail(&obj->ring_list, &ring->active_list);
1623
1624         obj->last_rendering_seqno = seqno;
1625         if (obj->fenced_gpu_access) {
1626                 struct drm_i915_fence_reg *reg;
1627
1628                 BUG_ON(obj->fence_reg == I915_FENCE_REG_NONE);
1629
1630                 obj->last_fenced_seqno = seqno;
1631                 obj->last_fenced_ring = ring;
1632
1633                 reg = &dev_priv->fence_regs[obj->fence_reg];
1634                 list_move_tail(&reg->lru_list, &dev_priv->mm.fence_list);
1635         }
1636 }
1637
1638 static void
1639 i915_gem_object_move_off_active(struct drm_i915_gem_object *obj)
1640 {
1641         list_del_init(&obj->ring_list);
1642         obj->last_rendering_seqno = 0;
1643 }
1644
1645 static void
1646 i915_gem_object_move_to_flushing(struct drm_i915_gem_object *obj)
1647 {
1648         struct drm_device *dev = obj->base.dev;
1649         drm_i915_private_t *dev_priv = dev->dev_private;
1650
1651         BUG_ON(!obj->active);
1652         list_move_tail(&obj->mm_list, &dev_priv->mm.flushing_list);
1653
1654         i915_gem_object_move_off_active(obj);
1655 }
1656
1657 static void
1658 i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
1659 {
1660         struct drm_device *dev = obj->base.dev;
1661         struct drm_i915_private *dev_priv = dev->dev_private;
1662
1663         if (obj->pin_count != 0)
1664                 list_move_tail(&obj->mm_list, &dev_priv->mm.pinned_list);
1665         else
1666                 list_move_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
1667
1668         BUG_ON(!list_empty(&obj->gpu_write_list));
1669         BUG_ON(!obj->active);
1670         obj->ring = NULL;
1671
1672         i915_gem_object_move_off_active(obj);
1673         obj->fenced_gpu_access = false;
1674
1675         obj->active = 0;
1676         obj->pending_gpu_write = false;
1677         drm_gem_object_unreference(&obj->base);
1678
1679         WARN_ON(i915_verify_lists(dev));
1680 }
1681
1682 /* Immediately discard the backing storage */
1683 static void
1684 i915_gem_object_truncate(struct drm_i915_gem_object *obj)
1685 {
1686         struct inode *inode;
1687
1688         /* Our goal here is to return as much of the memory as
1689          * is possible back to the system as we are called from OOM.
1690          * To do this we must instruct the shmfs to drop all of its
1691          * backing pages, *now*.
1692          */
1693         inode = obj->base.filp->f_path.dentry->d_inode;
1694         shmem_truncate_range(inode, 0, (loff_t)-1);
1695
1696         obj->madv = __I915_MADV_PURGED;
1697 }
1698
1699 static inline int
1700 i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj)
1701 {
1702         return obj->madv == I915_MADV_DONTNEED;
1703 }
1704
1705 static void
1706 i915_gem_process_flushing_list(struct intel_ring_buffer *ring,
1707                                uint32_t flush_domains)
1708 {
1709         struct drm_i915_gem_object *obj, *next;
1710
1711         list_for_each_entry_safe(obj, next,
1712                                  &ring->gpu_write_list,
1713                                  gpu_write_list) {
1714                 if (obj->base.write_domain & flush_domains) {
1715                         uint32_t old_write_domain = obj->base.write_domain;
1716
1717                         obj->base.write_domain = 0;
1718                         list_del_init(&obj->gpu_write_list);
1719                         i915_gem_object_move_to_active(obj, ring,
1720                                                        i915_gem_next_request_seqno(ring));
1721
1722                         trace_i915_gem_object_change_domain(obj,
1723                                                             obj->base.read_domains,
1724                                                             old_write_domain);
1725                 }
1726         }
1727 }
1728
1729 int
1730 i915_add_request(struct intel_ring_buffer *ring,
1731                  struct drm_file *file,
1732                  struct drm_i915_gem_request *request)
1733 {
1734         drm_i915_private_t *dev_priv = ring->dev->dev_private;
1735         uint32_t seqno;
1736         int was_empty;
1737         int ret;
1738
1739         BUG_ON(request == NULL);
1740
1741         ret = ring->add_request(ring, &seqno);
1742         if (ret)
1743             return ret;
1744
1745         trace_i915_gem_request_add(ring, seqno);
1746
1747         request->seqno = seqno;
1748         request->ring = ring;
1749         request->emitted_jiffies = jiffies;
1750         was_empty = list_empty(&ring->request_list);
1751         list_add_tail(&request->list, &ring->request_list);
1752
1753         if (file) {
1754                 struct drm_i915_file_private *file_priv = file->driver_priv;
1755
1756                 spin_lock(&file_priv->mm.lock);
1757                 request->file_priv = file_priv;
1758                 list_add_tail(&request->client_list,
1759                               &file_priv->mm.request_list);
1760                 spin_unlock(&file_priv->mm.lock);
1761         }
1762
1763         ring->outstanding_lazy_request = false;
1764
1765         if (!dev_priv->mm.suspended) {
1766                 mod_timer(&dev_priv->hangcheck_timer,
1767                           jiffies + msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
1768                 if (was_empty)
1769                         queue_delayed_work(dev_priv->wq,
1770                                            &dev_priv->mm.retire_work, HZ);
1771         }
1772         return 0;
1773 }
1774
1775 static inline void
1776 i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
1777 {
1778         struct drm_i915_file_private *file_priv = request->file_priv;
1779
1780         if (!file_priv)
1781                 return;
1782
1783         spin_lock(&file_priv->mm.lock);
1784         if (request->file_priv) {
1785                 list_del(&request->client_list);
1786                 request->file_priv = NULL;
1787         }
1788         spin_unlock(&file_priv->mm.lock);
1789 }
1790
1791 static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
1792                                       struct intel_ring_buffer *ring)
1793 {
1794         while (!list_empty(&ring->request_list)) {
1795                 struct drm_i915_gem_request *request;
1796
1797                 request = list_first_entry(&ring->request_list,
1798                                            struct drm_i915_gem_request,
1799                                            list);
1800
1801                 list_del(&request->list);
1802                 i915_gem_request_remove_from_client(request);
1803                 kfree(request);
1804         }
1805
1806         while (!list_empty(&ring->active_list)) {
1807                 struct drm_i915_gem_object *obj;
1808
1809                 obj = list_first_entry(&ring->active_list,
1810                                        struct drm_i915_gem_object,
1811                                        ring_list);
1812
1813                 obj->base.write_domain = 0;
1814                 list_del_init(&obj->gpu_write_list);
1815                 i915_gem_object_move_to_inactive(obj);
1816         }
1817 }
1818
1819 static void i915_gem_reset_fences(struct drm_device *dev)
1820 {
1821         struct drm_i915_private *dev_priv = dev->dev_private;
1822         int i;
1823
1824         for (i = 0; i < 16; i++) {
1825                 struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
1826                 struct drm_i915_gem_object *obj = reg->obj;
1827
1828                 if (!obj)
1829                         continue;
1830
1831                 if (obj->tiling_mode)
1832                         i915_gem_release_mmap(obj);
1833
1834                 reg->obj->fence_reg = I915_FENCE_REG_NONE;
1835                 reg->obj->fenced_gpu_access = false;
1836                 reg->obj->last_fenced_seqno = 0;
1837                 reg->obj->last_fenced_ring = NULL;
1838                 i915_gem_clear_fence_reg(dev, reg);
1839         }
1840 }
1841
1842 void i915_gem_reset(struct drm_device *dev)
1843 {
1844         struct drm_i915_private *dev_priv = dev->dev_private;
1845         struct drm_i915_gem_object *obj;
1846         int i;
1847
1848         for (i = 0; i < I915_NUM_RINGS; i++)
1849                 i915_gem_reset_ring_lists(dev_priv, &dev_priv->ring[i]);
1850
1851         /* Remove anything from the flushing lists. The GPU cache is likely
1852          * to be lost on reset along with the data, so simply move the
1853          * lost bo to the inactive list.
1854          */
1855         while (!list_empty(&dev_priv->mm.flushing_list)) {
1856                 obj= list_first_entry(&dev_priv->mm.flushing_list,
1857                                       struct drm_i915_gem_object,
1858                                       mm_list);
1859
1860                 obj->base.write_domain = 0;
1861                 list_del_init(&obj->gpu_write_list);
1862                 i915_gem_object_move_to_inactive(obj);
1863         }
1864
1865         /* Move everything out of the GPU domains to ensure we do any
1866          * necessary invalidation upon reuse.
1867          */
1868         list_for_each_entry(obj,
1869                             &dev_priv->mm.inactive_list,
1870                             mm_list)
1871         {
1872                 obj->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
1873         }
1874
1875         /* The fence registers are invalidated so clear them out */
1876         i915_gem_reset_fences(dev);
1877 }
1878
1879 /**
1880  * This function clears the request list as sequence numbers are passed.
1881  */
1882 static void
1883 i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
1884 {
1885         uint32_t seqno;
1886         int i;
1887
1888         if (list_empty(&ring->request_list))
1889                 return;
1890
1891         WARN_ON(i915_verify_lists(ring->dev));
1892
1893         seqno = ring->get_seqno(ring);
1894
1895         for (i = 0; i < ARRAY_SIZE(ring->sync_seqno); i++)
1896                 if (seqno >= ring->sync_seqno[i])
1897                         ring->sync_seqno[i] = 0;
1898
1899         while (!list_empty(&ring->request_list)) {
1900                 struct drm_i915_gem_request *request;
1901
1902                 request = list_first_entry(&ring->request_list,
1903                                            struct drm_i915_gem_request,
1904                                            list);
1905
1906                 if (!i915_seqno_passed(seqno, request->seqno))
1907                         break;
1908
1909                 trace_i915_gem_request_retire(ring, request->seqno);
1910
1911                 list_del(&request->list);
1912                 i915_gem_request_remove_from_client(request);
1913                 kfree(request);
1914         }
1915
1916         /* Move any buffers on the active list that are no longer referenced
1917          * by the ringbuffer to the flushing/inactive lists as appropriate.
1918          */
1919         while (!list_empty(&ring->active_list)) {
1920                 struct drm_i915_gem_object *obj;
1921
1922                 obj= list_first_entry(&ring->active_list,
1923                                       struct drm_i915_gem_object,
1924                                       ring_list);
1925
1926                 if (!i915_seqno_passed(seqno, obj->last_rendering_seqno))
1927                         break;
1928
1929                 if (obj->base.write_domain != 0)
1930                         i915_gem_object_move_to_flushing(obj);
1931                 else
1932                         i915_gem_object_move_to_inactive(obj);
1933         }
1934
1935         if (unlikely(ring->trace_irq_seqno &&
1936                      i915_seqno_passed(seqno, ring->trace_irq_seqno))) {
1937                 ring->irq_put(ring);
1938                 ring->trace_irq_seqno = 0;
1939         }
1940
1941         WARN_ON(i915_verify_lists(ring->dev));
1942 }
1943
1944 void
1945 i915_gem_retire_requests(struct drm_device *dev)
1946 {
1947         drm_i915_private_t *dev_priv = dev->dev_private;
1948         int i;
1949
1950         if (!list_empty(&dev_priv->mm.deferred_free_list)) {
1951             struct drm_i915_gem_object *obj, *next;
1952
1953             /* We must be careful that during unbind() we do not
1954              * accidentally infinitely recurse into retire requests.
1955              * Currently:
1956              *   retire -> free -> unbind -> wait -> retire_ring
1957              */
1958             list_for_each_entry_safe(obj, next,
1959                                      &dev_priv->mm.deferred_free_list,
1960                                      mm_list)
1961                     i915_gem_free_object_tail(obj);
1962         }
1963
1964         for (i = 0; i < I915_NUM_RINGS; i++)
1965                 i915_gem_retire_requests_ring(&dev_priv->ring[i]);
1966 }
1967
1968 static void
1969 i915_gem_retire_work_handler(struct work_struct *work)
1970 {
1971         drm_i915_private_t *dev_priv;
1972         struct drm_device *dev;
1973         bool idle;
1974         int i;
1975
1976         dev_priv = container_of(work, drm_i915_private_t,
1977                                 mm.retire_work.work);
1978         dev = dev_priv->dev;
1979
1980         /* Come back later if the device is busy... */
1981         if (!mutex_trylock(&dev->struct_mutex)) {
1982                 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
1983                 return;
1984         }
1985
1986         i915_gem_retire_requests(dev);
1987
1988         /* Send a periodic flush down the ring so we don't hold onto GEM
1989          * objects indefinitely.
1990          */
1991         idle = true;
1992         for (i = 0; i < I915_NUM_RINGS; i++) {
1993                 struct intel_ring_buffer *ring = &dev_priv->ring[i];
1994
1995                 if (!list_empty(&ring->gpu_write_list)) {
1996                         struct drm_i915_gem_request *request;
1997                         int ret;
1998
1999                         ret = i915_gem_flush_ring(ring,
2000                                                   0, I915_GEM_GPU_DOMAINS);
2001                         request = kzalloc(sizeof(*request), GFP_KERNEL);
2002                         if (ret || request == NULL ||
2003                             i915_add_request(ring, NULL, request))
2004                             kfree(request);
2005                 }
2006
2007                 idle &= list_empty(&ring->request_list);
2008         }
2009
2010         if (!dev_priv->mm.suspended && !idle)
2011                 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
2012
2013         mutex_unlock(&dev->struct_mutex);
2014 }
2015
2016 /**
2017  * Waits for a sequence number to be signaled, and cleans up the
2018  * request and object lists appropriately for that event.
2019  */
2020 int
2021 i915_wait_request(struct intel_ring_buffer *ring,
2022                   uint32_t seqno)
2023 {
2024         drm_i915_private_t *dev_priv = ring->dev->dev_private;
2025         u32 ier;
2026         int ret = 0;
2027
2028         BUG_ON(seqno == 0);
2029
2030         if (atomic_read(&dev_priv->mm.wedged)) {
2031                 struct completion *x = &dev_priv->error_completion;
2032                 bool recovery_complete;
2033                 unsigned long flags;
2034
2035                 /* Give the error handler a chance to run. */
2036                 spin_lock_irqsave(&x->wait.lock, flags);
2037                 recovery_complete = x->done > 0;
2038                 spin_unlock_irqrestore(&x->wait.lock, flags);
2039
2040                 return recovery_complete ? -EIO : -EAGAIN;
2041         }
2042
2043         if (seqno == ring->outstanding_lazy_request) {
2044                 struct drm_i915_gem_request *request;
2045
2046                 request = kzalloc(sizeof(*request), GFP_KERNEL);
2047                 if (request == NULL)
2048                         return -ENOMEM;
2049
2050                 ret = i915_add_request(ring, NULL, request);
2051                 if (ret) {
2052                         kfree(request);
2053                         return ret;
2054                 }
2055
2056                 seqno = request->seqno;
2057         }
2058
2059         if (!i915_seqno_passed(ring->get_seqno(ring), seqno)) {
2060                 if (HAS_PCH_SPLIT(ring->dev))
2061                         ier = I915_READ(DEIER) | I915_READ(GTIER);
2062                 else
2063                         ier = I915_READ(IER);
2064                 if (!ier) {
2065                         DRM_ERROR("something (likely vbetool) disabled "
2066                                   "interrupts, re-enabling\n");
2067                         ring->dev->driver->irq_preinstall(ring->dev);
2068                         ring->dev->driver->irq_postinstall(ring->dev);
2069                 }
2070
2071                 trace_i915_gem_request_wait_begin(ring, seqno);
2072
2073                 ring->waiting_seqno = seqno;
2074                 if (ring->irq_get(ring)) {
2075                         if (dev_priv->mm.interruptible)
2076                                 ret = wait_event_interruptible(ring->irq_queue,
2077                                                                i915_seqno_passed(ring->get_seqno(ring), seqno)
2078                                                                || atomic_read(&dev_priv->mm.wedged));
2079                         else
2080                                 wait_event(ring->irq_queue,
2081                                            i915_seqno_passed(ring->get_seqno(ring), seqno)
2082                                            || atomic_read(&dev_priv->mm.wedged));
2083
2084                         ring->irq_put(ring);
2085                 } else if (wait_for(i915_seqno_passed(ring->get_seqno(ring),
2086                                                       seqno) ||
2087                                     atomic_read(&dev_priv->mm.wedged), 3000))
2088                         ret = -EBUSY;
2089                 ring->waiting_seqno = 0;
2090
2091                 trace_i915_gem_request_wait_end(ring, seqno);
2092         }
2093         if (atomic_read(&dev_priv->mm.wedged))
2094                 ret = -EAGAIN;
2095
2096         if (ret && ret != -ERESTARTSYS)
2097                 DRM_ERROR("%s returns %d (awaiting %d at %d, next %d)\n",
2098                           __func__, ret, seqno, ring->get_seqno(ring),
2099                           dev_priv->next_seqno);
2100
2101         /* Directly dispatch request retiring.  While we have the work queue
2102          * to handle this, the waiter on a request often wants an associated
2103          * buffer to have made it to the inactive list, and we would need
2104          * a separate wait queue to handle that.
2105          */
2106         if (ret == 0)
2107                 i915_gem_retire_requests_ring(ring);
2108
2109         return ret;
2110 }
2111
2112 /**
2113  * Ensures that all rendering to the object has completed and the object is
2114  * safe to unbind from the GTT or access from the CPU.
2115  */
2116 int
2117 i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj)
2118 {
2119         int ret;
2120
2121         /* This function only exists to support waiting for existing rendering,
2122          * not for emitting required flushes.
2123          */
2124         BUG_ON((obj->base.write_domain & I915_GEM_GPU_DOMAINS) != 0);
2125
2126         /* If there is rendering queued on the buffer being evicted, wait for
2127          * it.
2128          */
2129         if (obj->active) {
2130                 ret = i915_wait_request(obj->ring, obj->last_rendering_seqno);
2131                 if (ret)
2132                         return ret;
2133         }
2134
2135         return 0;
2136 }
2137
2138 /**
2139  * Unbinds an object from the GTT aperture.
2140  */
2141 int
2142 i915_gem_object_unbind(struct drm_i915_gem_object *obj)
2143 {
2144         int ret = 0;
2145
2146         if (obj->gtt_space == NULL)
2147                 return 0;
2148
2149         if (obj->pin_count != 0) {
2150                 DRM_ERROR("Attempting to unbind pinned buffer\n");
2151                 return -EINVAL;
2152         }
2153
2154         /* blow away mappings if mapped through GTT */
2155         i915_gem_release_mmap(obj);
2156
2157         /* Move the object to the CPU domain to ensure that
2158          * any possible CPU writes while it's not in the GTT
2159          * are flushed when we go to remap it. This will
2160          * also ensure that all pending GPU writes are finished
2161          * before we unbind.
2162          */
2163         ret = i915_gem_object_set_to_cpu_domain(obj, 1);
2164         if (ret == -ERESTARTSYS)
2165                 return ret;
2166         /* Continue on if we fail due to EIO, the GPU is hung so we
2167          * should be safe and we need to cleanup or else we might
2168          * cause memory corruption through use-after-free.
2169          */
2170         if (ret) {
2171                 i915_gem_clflush_object(obj);
2172                 obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU;
2173         }
2174
2175         /* release the fence reg _after_ flushing */
2176         ret = i915_gem_object_put_fence(obj);
2177         if (ret == -ERESTARTSYS)
2178                 return ret;
2179
2180         trace_i915_gem_object_unbind(obj);
2181
2182         i915_gem_gtt_unbind_object(obj);
2183         i915_gem_object_put_pages_gtt(obj);
2184
2185         list_del_init(&obj->gtt_list);
2186         list_del_init(&obj->mm_list);
2187         /* Avoid an unnecessary call to unbind on rebind. */
2188         obj->map_and_fenceable = true;
2189
2190         drm_mm_put_block(obj->gtt_space);
2191         obj->gtt_space = NULL;
2192         obj->gtt_offset = 0;
2193
2194         if (i915_gem_object_is_purgeable(obj))
2195                 i915_gem_object_truncate(obj);
2196
2197         return ret;
2198 }
2199
2200 int
2201 i915_gem_flush_ring(struct intel_ring_buffer *ring,
2202                     uint32_t invalidate_domains,
2203                     uint32_t flush_domains)
2204 {
2205         int ret;
2206
2207         if (((invalidate_domains | flush_domains) & I915_GEM_GPU_DOMAINS) == 0)
2208                 return 0;
2209
2210         trace_i915_gem_ring_flush(ring, invalidate_domains, flush_domains);
2211
2212         ret = ring->flush(ring, invalidate_domains, flush_domains);
2213         if (ret)
2214                 return ret;
2215
2216         if (flush_domains & I915_GEM_GPU_DOMAINS)
2217                 i915_gem_process_flushing_list(ring, flush_domains);
2218
2219         return 0;
2220 }
2221
2222 static int i915_ring_idle(struct intel_ring_buffer *ring)
2223 {
2224         int ret;
2225
2226         if (list_empty(&ring->gpu_write_list) && list_empty(&ring->active_list))
2227                 return 0;
2228
2229         if (!list_empty(&ring->gpu_write_list)) {
2230                 ret = i915_gem_flush_ring(ring,
2231                                     I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
2232                 if (ret)
2233                         return ret;
2234         }
2235
2236         return i915_wait_request(ring, i915_gem_next_request_seqno(ring));
2237 }
2238
2239 int
2240 i915_gpu_idle(struct drm_device *dev)
2241 {
2242         drm_i915_private_t *dev_priv = dev->dev_private;
2243         bool lists_empty;
2244         int ret, i;
2245
2246         lists_empty = (list_empty(&dev_priv->mm.flushing_list) &&
2247                        list_empty(&dev_priv->mm.active_list));
2248         if (lists_empty)
2249                 return 0;
2250
2251         /* Flush everything onto the inactive list. */
2252         for (i = 0; i < I915_NUM_RINGS; i++) {
2253                 ret = i915_ring_idle(&dev_priv->ring[i]);
2254                 if (ret)
2255                         return ret;
2256         }
2257
2258         return 0;
2259 }
2260
2261 static int sandybridge_write_fence_reg(struct drm_i915_gem_object *obj,
2262                                        struct intel_ring_buffer *pipelined)
2263 {
2264         struct drm_device *dev = obj->base.dev;
2265         drm_i915_private_t *dev_priv = dev->dev_private;
2266         u32 size = obj->gtt_space->size;
2267         int regnum = obj->fence_reg;
2268         uint64_t val;
2269
2270         val = (uint64_t)((obj->gtt_offset + size - 4096) &
2271                          0xfffff000) << 32;
2272         val |= obj->gtt_offset & 0xfffff000;
2273         val |= (uint64_t)((obj->stride / 128) - 1) <<
2274                 SANDYBRIDGE_FENCE_PITCH_SHIFT;
2275
2276         if (obj->tiling_mode == I915_TILING_Y)
2277                 val |= 1 << I965_FENCE_TILING_Y_SHIFT;
2278         val |= I965_FENCE_REG_VALID;
2279
2280         if (pipelined) {
2281                 int ret = intel_ring_begin(pipelined, 6);
2282                 if (ret)
2283                         return ret;
2284
2285                 intel_ring_emit(pipelined, MI_NOOP);
2286                 intel_ring_emit(pipelined, MI_LOAD_REGISTER_IMM(2));
2287                 intel_ring_emit(pipelined, FENCE_REG_SANDYBRIDGE_0 + regnum*8);
2288                 intel_ring_emit(pipelined, (u32)val);
2289                 intel_ring_emit(pipelined, FENCE_REG_SANDYBRIDGE_0 + regnum*8 + 4);
2290                 intel_ring_emit(pipelined, (u32)(val >> 32));
2291                 intel_ring_advance(pipelined);
2292         } else
2293                 I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 + regnum * 8, val);
2294
2295         return 0;
2296 }
2297
2298 static int i965_write_fence_reg(struct drm_i915_gem_object *obj,
2299                                 struct intel_ring_buffer *pipelined)
2300 {
2301         struct drm_device *dev = obj->base.dev;
2302         drm_i915_private_t *dev_priv = dev->dev_private;
2303         u32 size = obj->gtt_space->size;
2304         int regnum = obj->fence_reg;
2305         uint64_t val;
2306
2307         val = (uint64_t)((obj->gtt_offset + size - 4096) &
2308                     0xfffff000) << 32;
2309         val |= obj->gtt_offset & 0xfffff000;
2310         val |= ((obj->stride / 128) - 1) << I965_FENCE_PITCH_SHIFT;
2311         if (obj->tiling_mode == I915_TILING_Y)
2312                 val |= 1 << I965_FENCE_TILING_Y_SHIFT;
2313         val |= I965_FENCE_REG_VALID;
2314
2315         if (pipelined) {
2316                 int ret = intel_ring_begin(pipelined, 6);
2317                 if (ret)
2318                         return ret;
2319
2320                 intel_ring_emit(pipelined, MI_NOOP);
2321                 intel_ring_emit(pipelined, MI_LOAD_REGISTER_IMM(2));
2322                 intel_ring_emit(pipelined, FENCE_REG_965_0 + regnum*8);
2323                 intel_ring_emit(pipelined, (u32)val);
2324                 intel_ring_emit(pipelined, FENCE_REG_965_0 + regnum*8 + 4);
2325                 intel_ring_emit(pipelined, (u32)(val >> 32));
2326                 intel_ring_advance(pipelined);
2327         } else
2328                 I915_WRITE64(FENCE_REG_965_0 + regnum * 8, val);
2329
2330         return 0;
2331 }
2332
2333 static int i915_write_fence_reg(struct drm_i915_gem_object *obj,
2334                                 struct intel_ring_buffer *pipelined)
2335 {
2336         struct drm_device *dev = obj->base.dev;
2337         drm_i915_private_t *dev_priv = dev->dev_private;
2338         u32 size = obj->gtt_space->size;
2339         u32 fence_reg, val, pitch_val;
2340         int tile_width;
2341
2342         if (WARN((obj->gtt_offset & ~I915_FENCE_START_MASK) ||
2343                  (size & -size) != size ||
2344                  (obj->gtt_offset & (size - 1)),
2345                  "object 0x%08x [fenceable? %d] not 1M or pot-size (0x%08x) aligned\n",
2346                  obj->gtt_offset, obj->map_and_fenceable, size))
2347                 return -EINVAL;
2348
2349         if (obj->tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
2350                 tile_width = 128;
2351         else
2352                 tile_width = 512;
2353
2354         /* Note: pitch better be a power of two tile widths */
2355         pitch_val = obj->stride / tile_width;
2356         pitch_val = ffs(pitch_val) - 1;
2357
2358         val = obj->gtt_offset;
2359         if (obj->tiling_mode == I915_TILING_Y)
2360                 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2361         val |= I915_FENCE_SIZE_BITS(size);
2362         val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2363         val |= I830_FENCE_REG_VALID;
2364
2365         fence_reg = obj->fence_reg;
2366         if (fence_reg < 8)
2367                 fence_reg = FENCE_REG_830_0 + fence_reg * 4;
2368         else
2369                 fence_reg = FENCE_REG_945_8 + (fence_reg - 8) * 4;
2370
2371         if (pipelined) {
2372                 int ret = intel_ring_begin(pipelined, 4);
2373                 if (ret)
2374                         return ret;
2375
2376                 intel_ring_emit(pipelined, MI_NOOP);
2377                 intel_ring_emit(pipelined, MI_LOAD_REGISTER_IMM(1));
2378                 intel_ring_emit(pipelined, fence_reg);
2379                 intel_ring_emit(pipelined, val);
2380                 intel_ring_advance(pipelined);
2381         } else
2382                 I915_WRITE(fence_reg, val);
2383
2384         return 0;
2385 }
2386
2387 static int i830_write_fence_reg(struct drm_i915_gem_object *obj,
2388                                 struct intel_ring_buffer *pipelined)
2389 {
2390         struct drm_device *dev = obj->base.dev;
2391         drm_i915_private_t *dev_priv = dev->dev_private;
2392         u32 size = obj->gtt_space->size;
2393         int regnum = obj->fence_reg;
2394         uint32_t val;
2395         uint32_t pitch_val;
2396
2397         if (WARN((obj->gtt_offset & ~I830_FENCE_START_MASK) ||
2398                  (size & -size) != size ||
2399                  (obj->gtt_offset & (size - 1)),
2400                  "object 0x%08x not 512K or pot-size 0x%08x aligned\n",
2401                  obj->gtt_offset, size))
2402                 return -EINVAL;
2403
2404         pitch_val = obj->stride / 128;
2405         pitch_val = ffs(pitch_val) - 1;
2406
2407         val = obj->gtt_offset;
2408         if (obj->tiling_mode == I915_TILING_Y)
2409                 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2410         val |= I830_FENCE_SIZE_BITS(size);
2411         val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2412         val |= I830_FENCE_REG_VALID;
2413
2414         if (pipelined) {
2415                 int ret = intel_ring_begin(pipelined, 4);
2416                 if (ret)
2417                         return ret;
2418
2419                 intel_ring_emit(pipelined, MI_NOOP);
2420                 intel_ring_emit(pipelined, MI_LOAD_REGISTER_IMM(1));
2421                 intel_ring_emit(pipelined, FENCE_REG_830_0 + regnum*4);
2422                 intel_ring_emit(pipelined, val);
2423                 intel_ring_advance(pipelined);
2424         } else
2425                 I915_WRITE(FENCE_REG_830_0 + regnum * 4, val);
2426
2427         return 0;
2428 }
2429
2430 static bool ring_passed_seqno(struct intel_ring_buffer *ring, u32 seqno)
2431 {
2432         return i915_seqno_passed(ring->get_seqno(ring), seqno);
2433 }
2434
2435 static int
2436 i915_gem_object_flush_fence(struct drm_i915_gem_object *obj,
2437                             struct intel_ring_buffer *pipelined)
2438 {
2439         int ret;
2440
2441         if (obj->fenced_gpu_access) {
2442                 if (obj->base.write_domain & I915_GEM_GPU_DOMAINS) {
2443                         ret = i915_gem_flush_ring(obj->last_fenced_ring,
2444                                                   0, obj->base.write_domain);
2445                         if (ret)
2446                                 return ret;
2447                 }
2448
2449                 obj->fenced_gpu_access = false;
2450         }
2451
2452         if (obj->last_fenced_seqno && pipelined != obj->last_fenced_ring) {
2453                 if (!ring_passed_seqno(obj->last_fenced_ring,
2454                                        obj->last_fenced_seqno)) {
2455                         ret = i915_wait_request(obj->last_fenced_ring,
2456                                                 obj->last_fenced_seqno);
2457                         if (ret)
2458                                 return ret;
2459                 }
2460
2461                 obj->last_fenced_seqno = 0;
2462                 obj->last_fenced_ring = NULL;
2463         }
2464
2465         /* Ensure that all CPU reads are completed before installing a fence
2466          * and all writes before removing the fence.
2467          */
2468         if (obj->base.read_domains & I915_GEM_DOMAIN_GTT)
2469                 mb();
2470
2471         return 0;
2472 }
2473
2474 int
2475 i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
2476 {
2477         int ret;
2478
2479         if (obj->tiling_mode)
2480                 i915_gem_release_mmap(obj);
2481
2482         ret = i915_gem_object_flush_fence(obj, NULL);
2483         if (ret)
2484                 return ret;
2485
2486         if (obj->fence_reg != I915_FENCE_REG_NONE) {
2487                 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2488                 i915_gem_clear_fence_reg(obj->base.dev,
2489                                          &dev_priv->fence_regs[obj->fence_reg]);
2490
2491                 obj->fence_reg = I915_FENCE_REG_NONE;
2492         }
2493
2494         return 0;
2495 }
2496
2497 static struct drm_i915_fence_reg *
2498 i915_find_fence_reg(struct drm_device *dev,
2499                     struct intel_ring_buffer *pipelined)
2500 {
2501         struct drm_i915_private *dev_priv = dev->dev_private;
2502         struct drm_i915_fence_reg *reg, *first, *avail;
2503         int i;
2504
2505         /* First try to find a free reg */
2506         avail = NULL;
2507         for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
2508                 reg = &dev_priv->fence_regs[i];
2509                 if (!reg->obj)
2510                         return reg;
2511
2512                 if (!reg->obj->pin_count)
2513                         avail = reg;
2514         }
2515
2516         if (avail == NULL)
2517                 return NULL;
2518
2519         /* None available, try to steal one or wait for a user to finish */
2520         avail = first = NULL;
2521         list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
2522                 if (reg->obj->pin_count)
2523                         continue;
2524
2525                 if (first == NULL)
2526                         first = reg;
2527
2528                 if (!pipelined ||
2529                     !reg->obj->last_fenced_ring ||
2530                     reg->obj->last_fenced_ring == pipelined) {
2531                         avail = reg;
2532                         break;
2533                 }
2534         }
2535
2536         if (avail == NULL)
2537                 avail = first;
2538
2539         return avail;
2540 }
2541
2542 /**
2543  * i915_gem_object_get_fence - set up a fence reg for an object
2544  * @obj: object to map through a fence reg
2545  * @pipelined: ring on which to queue the change, or NULL for CPU access
2546  * @interruptible: must we wait uninterruptibly for the register to retire?
2547  *
2548  * When mapping objects through the GTT, userspace wants to be able to write
2549  * to them without having to worry about swizzling if the object is tiled.
2550  *
2551  * This function walks the fence regs looking for a free one for @obj,
2552  * stealing one if it can't find any.
2553  *
2554  * It then sets up the reg based on the object's properties: address, pitch
2555  * and tiling format.
2556  */
2557 int
2558 i915_gem_object_get_fence(struct drm_i915_gem_object *obj,
2559                           struct intel_ring_buffer *pipelined)
2560 {
2561         struct drm_device *dev = obj->base.dev;
2562         struct drm_i915_private *dev_priv = dev->dev_private;
2563         struct drm_i915_fence_reg *reg;
2564         int ret;
2565
2566         /* XXX disable pipelining. There are bugs. Shocking. */
2567         pipelined = NULL;
2568
2569         /* Just update our place in the LRU if our fence is getting reused. */
2570         if (obj->fence_reg != I915_FENCE_REG_NONE) {
2571                 reg = &dev_priv->fence_regs[obj->fence_reg];
2572                 list_move_tail(&reg->lru_list, &dev_priv->mm.fence_list);
2573
2574                 if (obj->tiling_changed) {
2575                         ret = i915_gem_object_flush_fence(obj, pipelined);
2576                         if (ret)
2577                                 return ret;
2578
2579                         if (!obj->fenced_gpu_access && !obj->last_fenced_seqno)
2580                                 pipelined = NULL;
2581
2582                         if (pipelined) {
2583                                 reg->setup_seqno =
2584                                         i915_gem_next_request_seqno(pipelined);
2585                                 obj->last_fenced_seqno = reg->setup_seqno;
2586                                 obj->last_fenced_ring = pipelined;
2587                         }
2588
2589                         goto update;
2590                 }
2591
2592                 if (!pipelined) {
2593                         if (reg->setup_seqno) {
2594                                 if (!ring_passed_seqno(obj->last_fenced_ring,
2595                                                        reg->setup_seqno)) {
2596                                         ret = i915_wait_request(obj->last_fenced_ring,
2597                                                                 reg->setup_seqno);
2598                                         if (ret)
2599                                                 return ret;
2600                                 }
2601
2602                                 reg->setup_seqno = 0;
2603                         }
2604                 } else if (obj->last_fenced_ring &&
2605                            obj->last_fenced_ring != pipelined) {
2606                         ret = i915_gem_object_flush_fence(obj, pipelined);
2607                         if (ret)
2608                                 return ret;
2609                 }
2610
2611                 return 0;
2612         }
2613
2614         reg = i915_find_fence_reg(dev, pipelined);
2615         if (reg == NULL)
2616                 return -ENOSPC;
2617
2618         ret = i915_gem_object_flush_fence(obj, pipelined);
2619         if (ret)
2620                 return ret;
2621
2622         if (reg->obj) {
2623                 struct drm_i915_gem_object *old = reg->obj;
2624
2625                 drm_gem_object_reference(&old->base);
2626
2627                 if (old->tiling_mode)
2628                         i915_gem_release_mmap(old);
2629
2630                 ret = i915_gem_object_flush_fence(old, pipelined);
2631                 if (ret) {
2632                         drm_gem_object_unreference(&old->base);
2633                         return ret;
2634                 }
2635
2636                 if (old->last_fenced_seqno == 0 && obj->last_fenced_seqno == 0)
2637                         pipelined = NULL;
2638
2639                 old->fence_reg = I915_FENCE_REG_NONE;
2640                 old->last_fenced_ring = pipelined;
2641                 old->last_fenced_seqno =
2642                         pipelined ? i915_gem_next_request_seqno(pipelined) : 0;
2643
2644                 drm_gem_object_unreference(&old->base);
2645         } else if (obj->last_fenced_seqno == 0)
2646                 pipelined = NULL;
2647
2648         reg->obj = obj;
2649         list_move_tail(&reg->lru_list, &dev_priv->mm.fence_list);
2650         obj->fence_reg = reg - dev_priv->fence_regs;
2651         obj->last_fenced_ring = pipelined;
2652
2653         reg->setup_seqno =
2654                 pipelined ? i915_gem_next_request_seqno(pipelined) : 0;
2655         obj->last_fenced_seqno = reg->setup_seqno;
2656
2657 update:
2658         obj->tiling_changed = false;
2659         switch (INTEL_INFO(dev)->gen) {
2660         case 7:
2661         case 6:
2662                 ret = sandybridge_write_fence_reg(obj, pipelined);
2663                 break;
2664         case 5:
2665         case 4:
2666                 ret = i965_write_fence_reg(obj, pipelined);
2667                 break;
2668         case 3:
2669                 ret = i915_write_fence_reg(obj, pipelined);
2670                 break;
2671         case 2:
2672                 ret = i830_write_fence_reg(obj, pipelined);
2673                 break;
2674         }
2675
2676         return ret;
2677 }
2678
2679 /**
2680  * i915_gem_clear_fence_reg - clear out fence register info
2681  * @obj: object to clear
2682  *
2683  * Zeroes out the fence register itself and clears out the associated
2684  * data structures in dev_priv and obj.
2685  */
2686 static void
2687 i915_gem_clear_fence_reg(struct drm_device *dev,
2688                          struct drm_i915_fence_reg *reg)
2689 {
2690         drm_i915_private_t *dev_priv = dev->dev_private;
2691         uint32_t fence_reg = reg - dev_priv->fence_regs;
2692
2693         switch (INTEL_INFO(dev)->gen) {
2694         case 7:
2695         case 6:
2696                 I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 + fence_reg*8, 0);
2697                 break;
2698         case 5:
2699         case 4:
2700                 I915_WRITE64(FENCE_REG_965_0 + fence_reg*8, 0);
2701                 break;
2702         case 3:
2703                 if (fence_reg >= 8)
2704                         fence_reg = FENCE_REG_945_8 + (fence_reg - 8) * 4;
2705                 else
2706         case 2:
2707                         fence_reg = FENCE_REG_830_0 + fence_reg * 4;
2708
2709                 I915_WRITE(fence_reg, 0);
2710                 break;
2711         }
2712
2713         list_del_init(&reg->lru_list);
2714         reg->obj = NULL;
2715         reg->setup_seqno = 0;
2716 }
2717
2718 /**
2719  * Finds free space in the GTT aperture and binds the object there.
2720  */
2721 static int
2722 i915_gem_object_bind_to_gtt(struct drm_i915_gem_object *obj,
2723                             unsigned alignment,
2724                             bool map_and_fenceable)
2725 {
2726         struct drm_device *dev = obj->base.dev;
2727         drm_i915_private_t *dev_priv = dev->dev_private;
2728         struct drm_mm_node *free_space;
2729         gfp_t gfpmask = __GFP_NORETRY | __GFP_NOWARN;
2730         u32 size, fence_size, fence_alignment, unfenced_alignment;
2731         bool mappable, fenceable;
2732         int ret;
2733
2734         if (obj->madv != I915_MADV_WILLNEED) {
2735                 DRM_ERROR("Attempting to bind a purgeable object\n");
2736                 return -EINVAL;
2737         }
2738
2739         fence_size = i915_gem_get_gtt_size(dev,
2740                                            obj->base.size,
2741                                            obj->tiling_mode);
2742         fence_alignment = i915_gem_get_gtt_alignment(dev,
2743                                                      obj->base.size,
2744                                                      obj->tiling_mode);
2745         unfenced_alignment =
2746                 i915_gem_get_unfenced_gtt_alignment(dev,
2747                                                     obj->base.size,
2748                                                     obj->tiling_mode);
2749
2750         if (alignment == 0)
2751                 alignment = map_and_fenceable ? fence_alignment :
2752                                                 unfenced_alignment;
2753         if (map_and_fenceable && alignment & (fence_alignment - 1)) {
2754                 DRM_ERROR("Invalid object alignment requested %u\n", alignment);
2755                 return -EINVAL;
2756         }
2757
2758         size = map_and_fenceable ? fence_size : obj->base.size;
2759
2760         /* If the object is bigger than the entire aperture, reject it early
2761          * before evicting everything in a vain attempt to find space.
2762          */
2763         if (obj->base.size >
2764             (map_and_fenceable ? dev_priv->mm.gtt_mappable_end : dev_priv->mm.gtt_total)) {
2765                 DRM_ERROR("Attempting to bind an object larger than the aperture\n");
2766                 return -E2BIG;
2767         }
2768
2769  search_free:
2770         if (map_and_fenceable)
2771                 free_space =
2772                         drm_mm_search_free_in_range(&dev_priv->mm.gtt_space,
2773                                                     size, alignment, 0,
2774                                                     dev_priv->mm.gtt_mappable_end,
2775                                                     0);
2776         else
2777                 free_space = drm_mm_search_free(&dev_priv->mm.gtt_space,
2778                                                 size, alignment, 0);
2779
2780         if (free_space != NULL) {
2781                 if (map_and_fenceable)
2782                         obj->gtt_space =
2783                                 drm_mm_get_block_range_generic(free_space,
2784                                                                size, alignment, 0,
2785                                                                dev_priv->mm.gtt_mappable_end,
2786                                                                0);
2787                 else
2788                         obj->gtt_space =
2789                                 drm_mm_get_block(free_space, size, alignment);
2790         }
2791         if (obj->gtt_space == NULL) {
2792                 /* If the gtt is empty and we're still having trouble
2793                  * fitting our object in, we're out of memory.
2794                  */
2795                 ret = i915_gem_evict_something(dev, size, alignment,
2796                                                map_and_fenceable);
2797                 if (ret)
2798                         return ret;
2799
2800                 goto search_free;
2801         }
2802
2803         ret = i915_gem_object_get_pages_gtt(obj, gfpmask);
2804         if (ret) {
2805                 drm_mm_put_block(obj->gtt_space);
2806                 obj->gtt_space = NULL;
2807
2808                 if (ret == -ENOMEM) {
2809                         /* first try to reclaim some memory by clearing the GTT */
2810                         ret = i915_gem_evict_everything(dev, false);
2811                         if (ret) {
2812                                 /* now try to shrink everyone else */
2813                                 if (gfpmask) {
2814                                         gfpmask = 0;
2815                                         goto search_free;
2816                                 }
2817
2818                                 return -ENOMEM;
2819                         }
2820
2821                         goto search_free;
2822                 }
2823
2824                 return ret;
2825         }
2826
2827         ret = i915_gem_gtt_bind_object(obj);
2828         if (ret) {
2829                 i915_gem_object_put_pages_gtt(obj);
2830                 drm_mm_put_block(obj->gtt_space);
2831                 obj->gtt_space = NULL;
2832
2833                 if (i915_gem_evict_everything(dev, false))
2834                         return ret;
2835
2836                 goto search_free;
2837         }
2838
2839         list_add_tail(&obj->gtt_list, &dev_priv->mm.gtt_list);
2840         list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
2841
2842         /* Assert that the object is not currently in any GPU domain. As it
2843          * wasn't in the GTT, there shouldn't be any way it could have been in
2844          * a GPU cache
2845          */
2846         BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
2847         BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
2848
2849         obj->gtt_offset = obj->gtt_space->start;
2850
2851         fenceable =
2852                 obj->gtt_space->size == fence_size &&
2853                 (obj->gtt_space->start & (fence_alignment -1)) == 0;
2854
2855         mappable =
2856                 obj->gtt_offset + obj->base.size <= dev_priv->mm.gtt_mappable_end;
2857
2858         obj->map_and_fenceable = mappable && fenceable;
2859
2860         trace_i915_gem_object_bind(obj, map_and_fenceable);
2861         return 0;
2862 }
2863
2864 void
2865 i915_gem_clflush_object(struct drm_i915_gem_object *obj)
2866 {
2867         /* If we don't have a page list set up, then we're not pinned
2868          * to GPU, and we can ignore the cache flush because it'll happen
2869          * again at bind time.
2870          */
2871         if (obj->pages == NULL)
2872                 return;
2873
2874         /* If the GPU is snooping the contents of the CPU cache,
2875          * we do not need to manually clear the CPU cache lines.  However,
2876          * the caches are only snooped when the render cache is
2877          * flushed/invalidated.  As we always have to emit invalidations
2878          * and flushes when moving into and out of the RENDER domain, correct
2879          * snooping behaviour occurs naturally as the result of our domain
2880          * tracking.
2881          */
2882         if (obj->cache_level != I915_CACHE_NONE)
2883                 return;
2884
2885         trace_i915_gem_object_clflush(obj);
2886
2887         drm_clflush_pages(obj->pages, obj->base.size / PAGE_SIZE);
2888 }
2889
2890 /** Flushes any GPU write domain for the object if it's dirty. */
2891 static int
2892 i915_gem_object_flush_gpu_write_domain(struct drm_i915_gem_object *obj)
2893 {
2894         if ((obj->base.write_domain & I915_GEM_GPU_DOMAINS) == 0)
2895                 return 0;
2896
2897         /* Queue the GPU write cache flushing we need. */
2898         return i915_gem_flush_ring(obj->ring, 0, obj->base.write_domain);
2899 }
2900
2901 /** Flushes the GTT write domain for the object if it's dirty. */
2902 static void
2903 i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj)
2904 {
2905         uint32_t old_write_domain;
2906
2907         if (obj->base.write_domain != I915_GEM_DOMAIN_GTT)
2908                 return;
2909
2910         /* No actual flushing is required for the GTT write domain.  Writes
2911          * to it immediately go to main memory as far as we know, so there's
2912          * no chipset flush.  It also doesn't land in render cache.
2913          *
2914          * However, we do have to enforce the order so that all writes through
2915          * the GTT land before any writes to the device, such as updates to
2916          * the GATT itself.
2917          */
2918         wmb();
2919
2920         old_write_domain = obj->base.write_domain;
2921         obj->base.write_domain = 0;
2922
2923         trace_i915_gem_object_change_domain(obj,
2924                                             obj->base.read_domains,
2925                                             old_write_domain);
2926 }
2927
2928 /** Flushes the CPU write domain for the object if it's dirty. */
2929 static void
2930 i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj)
2931 {
2932         uint32_t old_write_domain;
2933
2934         if (obj->base.write_domain != I915_GEM_DOMAIN_CPU)
2935                 return;
2936
2937         i915_gem_clflush_object(obj);
2938         intel_gtt_chipset_flush();
2939         old_write_domain = obj->base.write_domain;
2940         obj->base.write_domain = 0;
2941
2942         trace_i915_gem_object_change_domain(obj,
2943                                             obj->base.read_domains,
2944                                             old_write_domain);
2945 }
2946
2947 /**
2948  * Moves a single object to the GTT read, and possibly write domain.
2949  *
2950  * This function returns when the move is complete, including waiting on
2951  * flushes to occur.
2952  */
2953 int
2954 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
2955 {
2956         uint32_t old_write_domain, old_read_domains;
2957         int ret;
2958
2959         /* Not valid to be called on unbound objects. */
2960         if (obj->gtt_space == NULL)
2961                 return -EINVAL;
2962
2963         if (obj->base.write_domain == I915_GEM_DOMAIN_GTT)
2964                 return 0;
2965
2966         ret = i915_gem_object_flush_gpu_write_domain(obj);
2967         if (ret)
2968                 return ret;
2969
2970         if (obj->pending_gpu_write || write) {
2971                 ret = i915_gem_object_wait_rendering(obj);
2972                 if (ret)
2973                         return ret;
2974         }
2975
2976         i915_gem_object_flush_cpu_write_domain(obj);
2977
2978         old_write_domain = obj->base.write_domain;
2979         old_read_domains = obj->base.read_domains;
2980
2981         /* It should now be out of any other write domains, and we can update
2982          * the domain values for our changes.
2983          */
2984         BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
2985         obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
2986         if (write) {
2987                 obj->base.read_domains = I915_GEM_DOMAIN_GTT;
2988                 obj->base.write_domain = I915_GEM_DOMAIN_GTT;
2989                 obj->dirty = 1;
2990         }
2991
2992         trace_i915_gem_object_change_domain(obj,
2993                                             old_read_domains,
2994                                             old_write_domain);
2995
2996         return 0;
2997 }
2998
2999 /*
3000  * Prepare buffer for display plane. Use uninterruptible for possible flush
3001  * wait, as in modesetting process we're not supposed to be interrupted.
3002  */
3003 int
3004 i915_gem_object_set_to_display_plane(struct drm_i915_gem_object *obj,
3005                                      struct intel_ring_buffer *pipelined)
3006 {
3007         uint32_t old_read_domains;
3008         int ret;
3009
3010         /* Not valid to be called on unbound objects. */
3011         if (obj->gtt_space == NULL)
3012                 return -EINVAL;
3013
3014         ret = i915_gem_object_flush_gpu_write_domain(obj);
3015         if (ret)
3016                 return ret;
3017
3018
3019         /* Currently, we are always called from an non-interruptible context. */
3020         if (pipelined != obj->ring) {
3021                 ret = i915_gem_object_wait_rendering(obj);
3022                 if (ret)
3023                         return ret;
3024         }
3025
3026         i915_gem_object_flush_cpu_write_domain(obj);
3027
3028         old_read_domains = obj->base.read_domains;
3029         obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3030
3031         trace_i915_gem_object_change_domain(obj,
3032                                             old_read_domains,
3033                                             obj->base.write_domain);
3034
3035         return 0;
3036 }
3037
3038 int
3039 i915_gem_object_flush_gpu(struct drm_i915_gem_object *obj)
3040 {
3041         int ret;
3042
3043         if (!obj->active)
3044                 return 0;
3045
3046         if (obj->base.write_domain & I915_GEM_GPU_DOMAINS) {
3047                 ret = i915_gem_flush_ring(obj->ring, 0, obj->base.write_domain);
3048                 if (ret)
3049                         return ret;
3050         }
3051
3052         return i915_gem_object_wait_rendering(obj);
3053 }
3054
3055 /**
3056  * Moves a single object to the CPU read, and possibly write domain.
3057  *
3058  * This function returns when the move is complete, including waiting on
3059  * flushes to occur.
3060  */
3061 static int
3062 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
3063 {
3064         uint32_t old_write_domain, old_read_domains;
3065         int ret;
3066
3067         if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
3068                 return 0;
3069
3070         ret = i915_gem_object_flush_gpu_write_domain(obj);
3071         if (ret)
3072                 return ret;
3073
3074         ret = i915_gem_object_wait_rendering(obj);
3075         if (ret)
3076                 return ret;
3077
3078         i915_gem_object_flush_gtt_write_domain(obj);
3079
3080         /* If we have a partially-valid cache of the object in the CPU,
3081          * finish invalidating it and free the per-page flags.
3082          */
3083         i915_gem_object_set_to_full_cpu_read_domain(obj);
3084
3085         old_write_domain = obj->base.write_domain;
3086         old_read_domains = obj->base.read_domains;
3087
3088         /* Flush the CPU cache if it's still invalid. */
3089         if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) {
3090                 i915_gem_clflush_object(obj);
3091
3092                 obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
3093         }
3094
3095         /* It should now be out of any other write domains, and we can update
3096          * the domain values for our changes.
3097          */
3098         BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
3099
3100         /* If we're writing through the CPU, then the GPU read domains will
3101          * need to be invalidated at next use.
3102          */
3103         if (write) {
3104                 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
3105                 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
3106         }
3107
3108         trace_i915_gem_object_change_domain(obj,
3109                                             old_read_domains,
3110                                             old_write_domain);
3111
3112         return 0;
3113 }
3114
3115 /**
3116  * Moves the object from a partially CPU read to a full one.
3117  *
3118  * Note that this only resolves i915_gem_object_set_cpu_read_domain_range(),
3119  * and doesn't handle transitioning from !(read_domains & I915_GEM_DOMAIN_CPU).
3120  */
3121 static void
3122 i915_gem_object_set_to_full_cpu_read_domain(struct drm_i915_gem_object *obj)
3123 {
3124         if (!obj->page_cpu_valid)
3125                 return;
3126
3127         /* If we're partially in the CPU read domain, finish moving it in.
3128          */
3129         if (obj->base.read_domains & I915_GEM_DOMAIN_CPU) {
3130                 int i;
3131
3132                 for (i = 0; i <= (obj->base.size - 1) / PAGE_SIZE; i++) {
3133                         if (obj->page_cpu_valid[i])
3134                                 continue;
3135                         drm_clflush_pages(obj->pages + i, 1);
3136                 }
3137         }
3138
3139         /* Free the page_cpu_valid mappings which are now stale, whether
3140          * or not we've got I915_GEM_DOMAIN_CPU.
3141          */
3142         kfree(obj->page_cpu_valid);
3143         obj->page_cpu_valid = NULL;
3144 }
3145
3146 /**
3147  * Set the CPU read domain on a range of the object.
3148  *
3149  * The object ends up with I915_GEM_DOMAIN_CPU in its read flags although it's
3150  * not entirely valid.  The page_cpu_valid member of the object flags which
3151  * pages have been flushed, and will be respected by
3152  * i915_gem_object_set_to_cpu_domain() if it's called on to get a valid mapping
3153  * of the whole object.
3154  *
3155  * This function returns when the move is complete, including waiting on
3156  * flushes to occur.
3157  */
3158 static int
3159 i915_gem_object_set_cpu_read_domain_range(struct drm_i915_gem_object *obj,
3160                                           uint64_t offset, uint64_t size)
3161 {
3162         uint32_t old_read_domains;
3163         int i, ret;
3164
3165         if (offset == 0 && size == obj->base.size)
3166                 return i915_gem_object_set_to_cpu_domain(obj, 0);
3167
3168         ret = i915_gem_object_flush_gpu_write_domain(obj);
3169         if (ret)
3170                 return ret;
3171
3172         ret = i915_gem_object_wait_rendering(obj);
3173         if (ret)
3174                 return ret;
3175
3176         i915_gem_object_flush_gtt_write_domain(obj);
3177
3178         /* If we're already fully in the CPU read domain, we're done. */
3179         if (obj->page_cpu_valid == NULL &&
3180             (obj->base.read_domains & I915_GEM_DOMAIN_CPU) != 0)
3181                 return 0;
3182
3183         /* Otherwise, create/clear the per-page CPU read domain flag if we're
3184          * newly adding I915_GEM_DOMAIN_CPU
3185          */
3186         if (obj->page_cpu_valid == NULL) {
3187                 obj->page_cpu_valid = kzalloc(obj->base.size / PAGE_SIZE,
3188                                               GFP_KERNEL);
3189                 if (obj->page_cpu_valid == NULL)
3190                         return -ENOMEM;
3191         } else if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0)
3192                 memset(obj->page_cpu_valid, 0, obj->base.size / PAGE_SIZE);
3193
3194         /* Flush the cache on any pages that are still invalid from the CPU's
3195          * perspective.
3196          */
3197         for (i = offset / PAGE_SIZE; i <= (offset + size - 1) / PAGE_SIZE;
3198              i++) {
3199                 if (obj->page_cpu_valid[i])
3200                         continue;
3201
3202                 drm_clflush_pages(obj->pages + i, 1);
3203
3204                 obj->page_cpu_valid[i] = 1;
3205         }
3206
3207         /* It should now be out of any other write domains, and we can update
3208          * the domain values for our changes.
3209          */
3210         BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
3211
3212         old_read_domains = obj->base.read_domains;
3213         obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
3214
3215         trace_i915_gem_object_change_domain(obj,
3216                                             old_read_domains,
3217                                             obj->base.write_domain);
3218
3219         return 0;
3220 }
3221
3222 /* Throttle our rendering by waiting until the ring has completed our requests
3223  * emitted over 20 msec ago.
3224  *
3225  * Note that if we were to use the current jiffies each time around the loop,
3226  * we wouldn't escape the function with any frames outstanding if the time to
3227  * render a frame was over 20ms.
3228  *
3229  * This should get us reasonable parallelism between CPU and GPU but also
3230  * relatively low latency when blocking on a particular request to finish.
3231  */
3232 static int
3233 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
3234 {
3235         struct drm_i915_private *dev_priv = dev->dev_private;
3236         struct drm_i915_file_private *file_priv = file->driver_priv;
3237         unsigned long recent_enough = jiffies - msecs_to_jiffies(20);
3238         struct drm_i915_gem_request *request;
3239         struct intel_ring_buffer *ring = NULL;
3240         u32 seqno = 0;
3241         int ret;
3242
3243         if (atomic_read(&dev_priv->mm.wedged))
3244                 return -EIO;
3245
3246         spin_lock(&file_priv->mm.lock);
3247         list_for_each_entry(request, &file_priv->mm.request_list, client_list) {
3248                 if (time_after_eq(request->emitted_jiffies, recent_enough))
3249                         break;
3250
3251                 ring = request->ring;
3252                 seqno = request->seqno;
3253         }
3254         spin_unlock(&file_priv->mm.lock);
3255
3256         if (seqno == 0)
3257                 return 0;
3258
3259         ret = 0;
3260         if (!i915_seqno_passed(ring->get_seqno(ring), seqno)) {
3261                 /* And wait for the seqno passing without holding any locks and
3262                  * causing extra latency for others. This is safe as the irq
3263                  * generation is designed to be run atomically and so is
3264                  * lockless.
3265                  */
3266                 if (ring->irq_get(ring)) {
3267                         ret = wait_event_interruptible(ring->irq_queue,
3268                                                        i915_seqno_passed(ring->get_seqno(ring), seqno)
3269                                                        || atomic_read(&dev_priv->mm.wedged));
3270                         ring->irq_put(ring);
3271
3272                         if (ret == 0 && atomic_read(&dev_priv->mm.wedged))
3273                                 ret = -EIO;
3274                 }
3275         }
3276
3277         if (ret == 0)
3278                 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
3279
3280         return ret;
3281 }
3282
3283 int
3284 i915_gem_object_pin(struct drm_i915_gem_object *obj,
3285                     uint32_t alignment,
3286                     bool map_and_fenceable)
3287 {
3288         struct drm_device *dev = obj->base.dev;
3289         struct drm_i915_private *dev_priv = dev->dev_private;
3290         int ret;
3291
3292         BUG_ON(obj->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT);
3293         WARN_ON(i915_verify_lists(dev));
3294
3295         if (obj->gtt_space != NULL) {
3296                 if ((alignment && obj->gtt_offset & (alignment - 1)) ||
3297                     (map_and_fenceable && !obj->map_and_fenceable)) {
3298                         WARN(obj->pin_count,
3299                              "bo is already pinned with incorrect alignment:"
3300                              " offset=%x, req.alignment=%x, req.map_and_fenceable=%d,"
3301                              " obj->map_and_fenceable=%d\n",
3302                              obj->gtt_offset, alignment,
3303                              map_and_fenceable,
3304                              obj->map_and_fenceable);
3305                         ret = i915_gem_object_unbind(obj);
3306                         if (ret)
3307                                 return ret;
3308                 }
3309         }
3310
3311         if (obj->gtt_space == NULL) {
3312                 ret = i915_gem_object_bind_to_gtt(obj, alignment,
3313                                                   map_and_fenceable);
3314                 if (ret)
3315                         return ret;
3316         }
3317
3318         if (obj->pin_count++ == 0) {
3319                 if (!obj->active)
3320                         list_move_tail(&obj->mm_list,
3321                                        &dev_priv->mm.pinned_list);
3322         }
3323         obj->pin_mappable |= map_and_fenceable;
3324
3325         WARN_ON(i915_verify_lists(dev));
3326         return 0;
3327 }
3328
3329 void
3330 i915_gem_object_unpin(struct drm_i915_gem_object *obj)
3331 {
3332         struct drm_device *dev = obj->base.dev;
3333         drm_i915_private_t *dev_priv = dev->dev_private;
3334
3335         WARN_ON(i915_verify_lists(dev));
3336         BUG_ON(obj->pin_count == 0);
3337         BUG_ON(obj->gtt_space == NULL);
3338
3339         if (--obj->pin_count == 0) {
3340                 if (!obj->active)
3341                         list_move_tail(&obj->mm_list,
3342                                        &dev_priv->mm.inactive_list);
3343                 obj->pin_mappable = false;
3344         }
3345         WARN_ON(i915_verify_lists(dev));
3346 }
3347
3348 int
3349 i915_gem_pin_ioctl(struct drm_device *dev, void *data,
3350                    struct drm_file *file)
3351 {
3352         struct drm_i915_gem_pin *args = data;
3353         struct drm_i915_gem_object *obj;
3354         int ret;
3355
3356         ret = i915_mutex_lock_interruptible(dev);
3357         if (ret)
3358                 return ret;
3359
3360         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3361         if (&obj->base == NULL) {
3362                 ret = -ENOENT;
3363                 goto unlock;
3364         }
3365
3366         if (obj->madv != I915_MADV_WILLNEED) {
3367                 DRM_ERROR("Attempting to pin a purgeable buffer\n");
3368                 ret = -EINVAL;
3369                 goto out;
3370         }
3371
3372         if (obj->pin_filp != NULL && obj->pin_filp != file) {
3373                 DRM_ERROR("Already pinned in i915_gem_pin_ioctl(): %d\n",
3374                           args->handle);
3375                 ret = -EINVAL;
3376                 goto out;
3377         }
3378
3379         obj->user_pin_count++;
3380         obj->pin_filp = file;
3381         if (obj->user_pin_count == 1) {
3382                 ret = i915_gem_object_pin(obj, args->alignment, true);
3383                 if (ret)
3384                         goto out;
3385         }
3386
3387         /* XXX - flush the CPU caches for pinned objects
3388          * as the X server doesn't manage domains yet
3389          */
3390         i915_gem_object_flush_cpu_write_domain(obj);
3391         args->offset = obj->gtt_offset;
3392 out:
3393         drm_gem_object_unreference(&obj->base);
3394 unlock:
3395         mutex_unlock(&dev->struct_mutex);
3396         return ret;
3397 }
3398
3399 int
3400 i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
3401                      struct drm_file *file)
3402 {
3403         struct drm_i915_gem_pin *args = data;
3404         struct drm_i915_gem_object *obj;
3405         int ret;
3406
3407         ret = i915_mutex_lock_interruptible(dev);
3408         if (ret)
3409                 return ret;
3410
3411         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3412         if (&obj->base == NULL) {
3413                 ret = -ENOENT;
3414                 goto unlock;
3415         }
3416
3417         if (obj->pin_filp != file) {
3418                 DRM_ERROR("Not pinned by caller in i915_gem_pin_ioctl(): %d\n",
3419                           args->handle);
3420                 ret = -EINVAL;
3421                 goto out;
3422         }
3423         obj->user_pin_count--;
3424         if (obj->user_pin_count == 0) {
3425                 obj->pin_filp = NULL;
3426                 i915_gem_object_unpin(obj);
3427         }
3428
3429 out:
3430         drm_gem_object_unreference(&obj->base);
3431 unlock:
3432         mutex_unlock(&dev->struct_mutex);
3433         return ret;
3434 }
3435
3436 int
3437 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
3438                     struct drm_file *file)
3439 {
3440         struct drm_i915_gem_busy *args = data;
3441         struct drm_i915_gem_object *obj;
3442         int ret;
3443
3444         ret = i915_mutex_lock_interruptible(dev);
3445         if (ret)
3446                 return ret;
3447
3448         obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3449         if (&obj->base == NULL) {
3450                 ret = -ENOENT;
3451                 goto unlock;
3452         }
3453
3454         /* Count all active objects as busy, even if they are currently not used
3455          * by the gpu. Users of this interface expect objects to eventually
3456          * become non-busy without any further actions, therefore emit any
3457          * necessary flushes here.
3458          */
3459         args->busy = obj->active;
3460         if (args->busy) {
3461                 /* Unconditionally flush objects, even when the gpu still uses this
3462                  * object. Userspace calling this function indicates that it wants to
3463                  * use this buffer rather sooner than later, so issuing the required
3464                  * flush earlier is beneficial.
3465                  */
3466                 if (obj->base.write_domain & I915_GEM_GPU_DOMAINS) {
3467                         ret = i915_gem_flush_ring(obj->ring,
3468                                                   0, obj->base.write_domain);
3469                 } else if (obj->ring->outstanding_lazy_request ==
3470                            obj->last_rendering_seqno) {
3471                         struct drm_i915_gem_request *request;
3472
3473                         /* This ring is not being cleared by active usage,
3474                          * so emit a request to do so.
3475                          */
3476                         request = kzalloc(sizeof(*request), GFP_KERNEL);
3477                         if (request)
3478                                 ret = i915_add_request(obj->ring, NULL,request);
3479                         else
3480                                 ret = -ENOMEM;
3481                 }
3482
3483                 /* Update the active list for the hardware's current position.
3484                  * Otherwise this only updates on a delayed timer or when irqs
3485                  * are actually unmasked, and our working set ends up being
3486                  * larger than required.
3487                  */
3488                 i915_gem_retire_requests_ring(obj->ring);
3489
3490                 args->busy = obj->active;
3491         }
3492
3493         drm_gem_object_unreference(&obj->base);
3494 unlock:
3495         mutex_unlock(&dev->struct_mutex);
3496         return ret;
3497 }
3498
3499 int
3500 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
3501                         struct drm_file *file_priv)
3502 {
3503     return i915_gem_ring_throttle(dev, file_priv);
3504 }
3505
3506 int
3507 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
3508                        struct drm_file *file_priv)
3509 {
3510         struct drm_i915_gem_madvise *args = data;
3511         struct drm_i915_gem_object *obj;
3512         int ret;
3513
3514         switch (args->madv) {
3515         case I915_MADV_DONTNEED:
3516         case I915_MADV_WILLNEED:
3517             break;
3518         default:
3519             return -EINVAL;
3520         }
3521
3522         ret = i915_mutex_lock_interruptible(dev);
3523         if (ret)
3524                 return ret;
3525
3526         obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle));
3527         if (&obj->base == NULL) {
3528                 ret = -ENOENT;
3529                 goto unlock;
3530         }
3531
3532         if (obj->pin_count) {
3533                 ret = -EINVAL;
3534                 goto out;
3535         }
3536
3537         if (obj->madv != __I915_MADV_PURGED)
3538                 obj->madv = args->madv;
3539
3540         /* if the object is no longer bound, discard its backing storage */
3541         if (i915_gem_object_is_purgeable(obj) &&
3542             obj->gtt_space == NULL)
3543                 i915_gem_object_truncate(obj);
3544
3545         args->retained = obj->madv != __I915_MADV_PURGED;
3546
3547 out:
3548         drm_gem_object_unreference(&obj->base);
3549 unlock:
3550         mutex_unlock(&dev->struct_mutex);
3551         return ret;
3552 }
3553
3554 struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
3555                                                   size_t size)
3556 {
3557         struct drm_i915_private *dev_priv = dev->dev_private;
3558         struct drm_i915_gem_object *obj;
3559         struct address_space *mapping;
3560
3561         obj = kzalloc(sizeof(*obj), GFP_KERNEL);
3562         if (obj == NULL)
3563                 return NULL;
3564
3565         if (drm_gem_object_init(dev, &obj->base, size) != 0) {
3566                 kfree(obj);
3567                 return NULL;
3568         }
3569
3570         mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
3571         mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
3572
3573         i915_gem_info_add_obj(dev_priv, size);
3574
3575         obj->base.write_domain = I915_GEM_DOMAIN_CPU;
3576         obj->base.read_domains = I915_GEM_DOMAIN_CPU;
3577
3578         obj->cache_level = I915_CACHE_NONE;
3579         obj->base.driver_private = NULL;
3580         obj->fence_reg = I915_FENCE_REG_NONE;
3581         INIT_LIST_HEAD(&obj->mm_list);
3582         INIT_LIST_HEAD(&obj->gtt_list);
3583         INIT_LIST_HEAD(&obj->ring_list);
3584         INIT_LIST_HEAD(&obj->exec_list);
3585         INIT_LIST_HEAD(&obj->gpu_write_list);
3586         obj->madv = I915_MADV_WILLNEED;
3587         /* Avoid an unnecessary call to unbind on the first bind. */
3588         obj->map_and_fenceable = true;
3589
3590         return obj;
3591 }
3592
3593 int i915_gem_init_object(struct drm_gem_object *obj)
3594 {
3595         BUG();
3596
3597         return 0;
3598 }
3599
3600 static void i915_gem_free_object_tail(struct drm_i915_gem_object *obj)
3601 {
3602         struct drm_device *dev = obj->base.dev;
3603         drm_i915_private_t *dev_priv = dev->dev_private;
3604         int ret;
3605
3606         ret = i915_gem_object_unbind(obj);
3607         if (ret == -ERESTARTSYS) {
3608                 list_move(&obj->mm_list,
3609                           &dev_priv->mm.deferred_free_list);
3610                 return;
3611         }
3612
3613         trace_i915_gem_object_destroy(obj);
3614
3615         if (obj->base.map_list.map)
3616                 i915_gem_free_mmap_offset(obj);
3617
3618         drm_gem_object_release(&obj->base);
3619         i915_gem_info_remove_obj(dev_priv, obj->base.size);
3620
3621         kfree(obj->page_cpu_valid);
3622         kfree(obj->bit_17);
3623         kfree(obj);
3624 }
3625
3626 void i915_gem_free_object(struct drm_gem_object *gem_obj)
3627 {
3628         struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
3629         struct drm_device *dev = obj->base.dev;
3630
3631         while (obj->pin_count > 0)
3632                 i915_gem_object_unpin(obj);
3633
3634         if (obj->phys_obj)
3635                 i915_gem_detach_phys_object(dev, obj);
3636
3637         i915_gem_free_object_tail(obj);
3638 }
3639
3640 int
3641 i915_gem_idle(struct drm_device *dev)
3642 {
3643         drm_i915_private_t *dev_priv = dev->dev_private;
3644         int ret;
3645
3646         mutex_lock(&dev->struct_mutex);
3647
3648         if (dev_priv->mm.suspended) {
3649                 mutex_unlock(&dev->struct_mutex);
3650                 return 0;
3651         }
3652
3653         ret = i915_gpu_idle(dev);
3654         if (ret) {
3655                 mutex_unlock(&dev->struct_mutex);
3656                 return ret;
3657         }
3658
3659         /* Under UMS, be paranoid and evict. */
3660         if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
3661                 ret = i915_gem_evict_inactive(dev, false);
3662                 if (ret) {
3663                         mutex_unlock(&dev->struct_mutex);
3664                         return ret;
3665                 }
3666         }
3667
3668         i915_gem_reset_fences(dev);
3669
3670         /* Hack!  Don't let anybody do execbuf while we don't control the chip.
3671          * We need to replace this with a semaphore, or something.
3672          * And not confound mm.suspended!
3673          */
3674         dev_priv->mm.suspended = 1;
3675         del_timer_sync(&dev_priv->hangcheck_timer);
3676
3677         i915_kernel_lost_context(dev);
3678         i915_gem_cleanup_ringbuffer(dev);
3679
3680         mutex_unlock(&dev->struct_mutex);
3681
3682         /* Cancel the retire work handler, which should be idle now. */
3683         cancel_delayed_work_sync(&dev_priv->mm.retire_work);
3684
3685         return 0;
3686 }
3687
3688 int
3689 i915_gem_init_ringbuffer(struct drm_device *dev)
3690 {
3691         drm_i915_private_t *dev_priv = dev->dev_private;
3692         int ret;
3693
3694         ret = intel_init_render_ring_buffer(dev);
3695         if (ret)
3696                 return ret;
3697
3698         if (HAS_BSD(dev)) {
3699                 ret = intel_init_bsd_ring_buffer(dev);
3700                 if (ret)
3701                         goto cleanup_render_ring;
3702         }
3703
3704         if (HAS_BLT(dev)) {
3705                 ret = intel_init_blt_ring_buffer(dev);
3706                 if (ret)
3707                         goto cleanup_bsd_ring;
3708         }
3709
3710         dev_priv->next_seqno = 1;
3711
3712         return 0;
3713
3714 cleanup_bsd_ring:
3715         intel_cleanup_ring_buffer(&dev_priv->ring[VCS]);
3716 cleanup_render_ring:
3717         intel_cleanup_ring_buffer(&dev_priv->ring[RCS]);
3718         return ret;
3719 }
3720
3721 void
3722 i915_gem_cleanup_ringbuffer(struct drm_device *dev)
3723 {
3724         drm_i915_private_t *dev_priv = dev->dev_private;
3725         int i;
3726
3727         for (i = 0; i < I915_NUM_RINGS; i++)
3728                 intel_cleanup_ring_buffer(&dev_priv->ring[i]);
3729 }
3730
3731 int
3732 i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
3733                        struct drm_file *file_priv)
3734 {
3735         drm_i915_private_t *dev_priv = dev->dev_private;
3736         int ret, i;
3737
3738         if (drm_core_check_feature(dev, DRIVER_MODESET))
3739                 return 0;
3740
3741         if (atomic_read(&dev_priv->mm.wedged)) {
3742                 DRM_ERROR("Reenabling wedged hardware, good luck\n");
3743                 atomic_set(&dev_priv->mm.wedged, 0);
3744         }
3745
3746         mutex_lock(&dev->struct_mutex);
3747         dev_priv->mm.suspended = 0;
3748
3749         ret = i915_gem_init_ringbuffer(dev);
3750         if (ret != 0) {
3751                 mutex_unlock(&dev->struct_mutex);
3752                 return ret;
3753         }
3754
3755         BUG_ON(!list_empty(&dev_priv->mm.active_list));
3756         BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
3757         BUG_ON(!list_empty(&dev_priv->mm.inactive_list));
3758         for (i = 0; i < I915_NUM_RINGS; i++) {
3759                 BUG_ON(!list_empty(&dev_priv->ring[i].active_list));
3760                 BUG_ON(!list_empty(&dev_priv->ring[i].request_list));
3761         }
3762         mutex_unlock(&dev->struct_mutex);
3763
3764         ret = drm_irq_install(dev);
3765         if (ret)
3766                 goto cleanup_ringbuffer;
3767
3768         return 0;
3769
3770 cleanup_ringbuffer:
3771         mutex_lock(&dev->struct_mutex);
3772         i915_gem_cleanup_ringbuffer(dev);
3773         dev_priv->mm.suspended = 1;
3774         mutex_unlock(&dev->struct_mutex);
3775
3776         return ret;
3777 }
3778
3779 int
3780 i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
3781                        struct drm_file *file_priv)
3782 {
3783         if (drm_core_check_feature(dev, DRIVER_MODESET))
3784                 return 0;
3785
3786         drm_irq_uninstall(dev);
3787         return i915_gem_idle(dev);
3788 }
3789
3790 void
3791 i915_gem_lastclose(struct drm_device *dev)
3792 {
3793         int ret;
3794
3795         if (drm_core_check_feature(dev, DRIVER_MODESET))
3796                 return;
3797
3798         ret = i915_gem_idle(dev);
3799         if (ret)
3800                 DRM_ERROR("failed to idle hardware: %d\n", ret);
3801 }
3802
3803 static void
3804 init_ring_lists(struct intel_ring_buffer *ring)
3805 {
3806         INIT_LIST_HEAD(&ring->active_list);
3807         INIT_LIST_HEAD(&ring->request_list);
3808         INIT_LIST_HEAD(&ring->gpu_write_list);
3809 }
3810
3811 void
3812 i915_gem_load(struct drm_device *dev)
3813 {
3814         int i;
3815         drm_i915_private_t *dev_priv = dev->dev_private;
3816
3817         INIT_LIST_HEAD(&dev_priv->mm.active_list);
3818         INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
3819         INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
3820         INIT_LIST_HEAD(&dev_priv->mm.pinned_list);
3821         INIT_LIST_HEAD(&dev_priv->mm.fence_list);
3822         INIT_LIST_HEAD(&dev_priv->mm.deferred_free_list);
3823         INIT_LIST_HEAD(&dev_priv->mm.gtt_list);
3824         for (i = 0; i < I915_NUM_RINGS; i++)
3825                 init_ring_lists(&dev_priv->ring[i]);
3826         for (i = 0; i < 16; i++)
3827                 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
3828         INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
3829                           i915_gem_retire_work_handler);
3830         init_completion(&dev_priv->error_completion);
3831
3832         /* On GEN3 we really need to make sure the ARB C3 LP bit is set */
3833         if (IS_GEN3(dev)) {
3834                 u32 tmp = I915_READ(MI_ARB_STATE);
3835                 if (!(tmp & MI_ARB_C3_LP_WRITE_ENABLE)) {
3836                         /* arb state is a masked write, so set bit + bit in mask */
3837                         tmp = MI_ARB_C3_LP_WRITE_ENABLE | (MI_ARB_C3_LP_WRITE_ENABLE << MI_ARB_MASK_SHIFT);
3838                         I915_WRITE(MI_ARB_STATE, tmp);
3839                 }
3840         }
3841
3842         dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL;
3843
3844         /* Old X drivers will take 0-2 for front, back, depth buffers */
3845         if (!drm_core_check_feature(dev, DRIVER_MODESET))
3846                 dev_priv->fence_reg_start = 3;
3847
3848         if (INTEL_INFO(dev)->gen >= 4 || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
3849                 dev_priv->num_fence_regs = 16;
3850         else
3851                 dev_priv->num_fence_regs = 8;
3852
3853         /* Initialize fence registers to zero */
3854         for (i = 0; i < dev_priv->num_fence_regs; i++) {
3855                 i915_gem_clear_fence_reg(dev, &dev_priv->fence_regs[i]);
3856         }
3857
3858         i915_gem_detect_bit_6_swizzle(dev);
3859         init_waitqueue_head(&dev_priv->pending_flip_queue);
3860
3861         dev_priv->mm.interruptible = true;
3862
3863         dev_priv->mm.inactive_shrinker.shrink = i915_gem_inactive_shrink;
3864         dev_priv->mm.inactive_shrinker.seeks = DEFAULT_SEEKS;
3865         register_shrinker(&dev_priv->mm.inactive_shrinker);
3866 }
3867
3868 /*
3869  * Create a physically contiguous memory object for this object
3870  * e.g. for cursor + overlay regs
3871  */
3872 static int i915_gem_init_phys_object(struct drm_device *dev,
3873                                      int id, int size, int align)
3874 {
3875         drm_i915_private_t *dev_priv = dev->dev_private;
3876         struct drm_i915_gem_phys_object *phys_obj;
3877         int ret;
3878
3879         if (dev_priv->mm.phys_objs[id - 1] || !size)
3880                 return 0;
3881
3882         phys_obj = kzalloc(sizeof(struct drm_i915_gem_phys_object), GFP_KERNEL);
3883         if (!phys_obj)
3884                 return -ENOMEM;
3885
3886         phys_obj->id = id;
3887
3888         phys_obj->handle = drm_pci_alloc(dev, size, align);
3889         if (!phys_obj->handle) {
3890                 ret = -ENOMEM;
3891                 goto kfree_obj;
3892         }
3893 #ifdef CONFIG_X86
3894         set_memory_wc((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
3895 #endif
3896
3897         dev_priv->mm.phys_objs[id - 1] = phys_obj;
3898
3899         return 0;
3900 kfree_obj:
3901         kfree(phys_obj);
3902         return ret;
3903 }
3904
3905 static void i915_gem_free_phys_object(struct drm_device *dev, int id)
3906 {
3907         drm_i915_private_t *dev_priv = dev->dev_private;
3908         struct drm_i915_gem_phys_object *phys_obj;
3909
3910         if (!dev_priv->mm.phys_objs[id - 1])
3911                 return;
3912
3913         phys_obj = dev_priv->mm.phys_objs[id - 1];
3914         if (phys_obj->cur_obj) {
3915                 i915_gem_detach_phys_object(dev, phys_obj->cur_obj);
3916         }
3917
3918 #ifdef CONFIG_X86
3919         set_memory_wb((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
3920 #endif
3921         drm_pci_free(dev, phys_obj->handle);
3922         kfree(phys_obj);
3923         dev_priv->mm.phys_objs[id - 1] = NULL;
3924 }
3925
3926 void i915_gem_free_all_phys_object(struct drm_device *dev)
3927 {
3928         int i;
3929
3930         for (i = I915_GEM_PHYS_CURSOR_0; i <= I915_MAX_PHYS_OBJECT; i++)
3931                 i915_gem_free_phys_object(dev, i);
3932 }
3933
3934 void i915_gem_detach_phys_object(struct drm_device *dev,
3935                                  struct drm_i915_gem_object *obj)
3936 {
3937         struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
3938         char *vaddr;
3939         int i;
3940         int page_count;
3941
3942         if (!obj->phys_obj)
3943                 return;
3944         vaddr = obj->phys_obj->handle->vaddr;
3945
3946         page_count = obj->base.size / PAGE_SIZE;
3947         for (i = 0; i < page_count; i++) {
3948                 struct page *page = shmem_read_mapping_page(mapping, i);
3949                 if (!IS_ERR(page)) {
3950                         char *dst = kmap_atomic(page);
3951                         memcpy(dst, vaddr + i*PAGE_SIZE, PAGE_SIZE);
3952                         kunmap_atomic(dst);
3953
3954                         drm_clflush_pages(&page, 1);
3955
3956                         set_page_dirty(page);
3957                         mark_page_accessed(page);
3958                         page_cache_release(page);
3959                 }
3960         }
3961         intel_gtt_chipset_flush();
3962
3963         obj->phys_obj->cur_obj = NULL;
3964         obj->phys_obj = NULL;
3965 }
3966
3967 int
3968 i915_gem_attach_phys_object(struct drm_device *dev,
3969                             struct drm_i915_gem_object *obj,
3970                             int id,
3971                             int align)
3972 {
3973         struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
3974         drm_i915_private_t *dev_priv = dev->dev_private;
3975         int ret = 0;
3976         int page_count;
3977         int i;
3978
3979         if (id > I915_MAX_PHYS_OBJECT)
3980                 return -EINVAL;
3981
3982         if (obj->phys_obj) {
3983                 if (obj->phys_obj->id == id)
3984                         return 0;
3985                 i915_gem_detach_phys_object(dev, obj);
3986         }
3987
3988         /* create a new object */
3989         if (!dev_priv->mm.phys_objs[id - 1]) {
3990                 ret = i915_gem_init_phys_object(dev, id,
3991                                                 obj->base.size, align);
3992                 if (ret) {
3993                         DRM_ERROR("failed to init phys object %d size: %zu\n",
3994                                   id, obj->base.size);
3995                         return ret;
3996                 }
3997         }
3998
3999         /* bind to the object */
4000         obj->phys_obj = dev_priv->mm.phys_objs[id - 1];
4001         obj->phys_obj->cur_obj = obj;
4002
4003         page_count = obj->base.size / PAGE_SIZE;
4004
4005         for (i = 0; i < page_count; i++) {
4006                 struct page *page;
4007                 char *dst, *src;
4008
4009                 page = shmem_read_mapping_page(mapping, i);
4010                 if (IS_ERR(page))
4011                         return PTR_ERR(page);
4012
4013                 src = kmap_atomic(page);
4014                 dst = obj->phys_obj->handle->vaddr + (i * PAGE_SIZE);
4015                 memcpy(dst, src, PAGE_SIZE);
4016                 kunmap_atomic(src);
4017
4018                 mark_page_accessed(page);
4019                 page_cache_release(page);
4020         }
4021
4022         return 0;
4023 }
4024
4025 static int
4026 i915_gem_phys_pwrite(struct drm_device *dev,
4027                      struct drm_i915_gem_object *obj,
4028                      struct drm_i915_gem_pwrite *args,
4029                      struct drm_file *file_priv)
4030 {
4031         void *vaddr = obj->phys_obj->handle->vaddr + args->offset;
4032         char __user *user_data = (char __user *) (uintptr_t) args->data_ptr;
4033
4034         if (__copy_from_user_inatomic_nocache(vaddr, user_data, args->size)) {
4035                 unsigned long unwritten;
4036
4037                 /* The physical object once assigned is fixed for the lifetime
4038                  * of the obj, so we can safely drop the lock and continue
4039                  * to access vaddr.
4040                  */
4041                 mutex_unlock(&dev->struct_mutex);
4042                 unwritten = copy_from_user(vaddr, user_data, args->size);
4043                 mutex_lock(&dev->struct_mutex);
4044                 if (unwritten)
4045                         return -EFAULT;
4046         }
4047
4048         intel_gtt_chipset_flush();
4049         return 0;
4050 }
4051
4052 void i915_gem_release(struct drm_device *dev, struct drm_file *file)
4053 {
4054         struct drm_i915_file_private *file_priv = file->driver_priv;
4055
4056         /* Clean up our request list when the client is going away, so that
4057          * later retire_requests won't dereference our soon-to-be-gone
4058          * file_priv.
4059          */
4060         spin_lock(&file_priv->mm.lock);
4061         while (!list_empty(&file_priv->mm.request_list)) {
4062                 struct drm_i915_gem_request *request;
4063
4064                 request = list_first_entry(&file_priv->mm.request_list,
4065                                            struct drm_i915_gem_request,
4066                                            client_list);
4067                 list_del(&request->client_list);
4068                 request->file_priv = NULL;
4069         }
4070         spin_unlock(&file_priv->mm.lock);
4071 }
4072
4073 static int
4074 i915_gpu_is_active(struct drm_device *dev)
4075 {
4076         drm_i915_private_t *dev_priv = dev->dev_private;
4077         int lists_empty;
4078
4079         lists_empty = list_empty(&dev_priv->mm.flushing_list) &&
4080                       list_empty(&dev_priv->mm.active_list);
4081
4082         return !lists_empty;
4083 }
4084
4085 static int
4086 i915_gem_inactive_shrink(struct shrinker *shrinker, struct shrink_control *sc)
4087 {
4088         struct drm_i915_private *dev_priv =
4089                 container_of(shrinker,
4090                              struct drm_i915_private,
4091                              mm.inactive_shrinker);
4092         struct drm_device *dev = dev_priv->dev;
4093         struct drm_i915_gem_object *obj, *next;
4094         int nr_to_scan = sc->nr_to_scan;
4095         int cnt;
4096
4097         if (!mutex_trylock(&dev->struct_mutex))
4098                 return 0;
4099
4100         /* "fast-path" to count number of available objects */
4101         if (nr_to_scan == 0) {
4102                 cnt = 0;
4103                 list_for_each_entry(obj,
4104                                     &dev_priv->mm.inactive_list,
4105                                     mm_list)
4106                         cnt++;
4107                 mutex_unlock(&dev->struct_mutex);
4108                 return cnt / 100 * sysctl_vfs_cache_pressure;
4109         }
4110
4111 rescan:
4112         /* first scan for clean buffers */
4113         i915_gem_retire_requests(dev);
4114
4115         list_for_each_entry_safe(obj, next,
4116                                  &dev_priv->mm.inactive_list,
4117                                  mm_list) {
4118                 if (i915_gem_object_is_purgeable(obj)) {
4119                         if (i915_gem_object_unbind(obj) == 0 &&
4120                             --nr_to_scan == 0)
4121                                 break;
4122                 }
4123         }
4124
4125         /* second pass, evict/count anything still on the inactive list */
4126         cnt = 0;
4127         list_for_each_entry_safe(obj, next,
4128                                  &dev_priv->mm.inactive_list,
4129                                  mm_list) {
4130                 if (nr_to_scan &&
4131                     i915_gem_object_unbind(obj) == 0)
4132                         nr_to_scan--;
4133                 else
4134                         cnt++;
4135         }
4136
4137         if (nr_to_scan && i915_gpu_is_active(dev)) {
4138                 /*
4139                  * We are desperate for pages, so as a last resort, wait
4140                  * for the GPU to finish and discard whatever we can.
4141                  * This has a dramatic impact to reduce the number of
4142                  * OOM-killer events whilst running the GPU aggressively.
4143                  */
4144                 if (i915_gpu_idle(dev) == 0)
4145                         goto rescan;
4146         }
4147         mutex_unlock(&dev->struct_mutex);
4148         return cnt / 100 * sysctl_vfs_cache_pressure;
4149 }