drivers/staging/android/ion/ion.c

   1 /*
   2  *
   3  * drivers/staging/android/ion/ion.c
   4  *
   5  * Copyright (C) 2011 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/err.h>
  20 #include <linux/file.h>
  21 #include <linux/freezer.h>
  22 #include <linux/fs.h>
  23 #include <linux/anon_inodes.h>
  24 #include <linux/kthread.h>
  25 #include <linux/list.h>
  26 #include <linux/memblock.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/export.h>
  29 #include <linux/mm.h>
  30 #include <linux/mm_types.h>
  31 #include <linux/rbtree.h>
  32 #include <linux/slab.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/debugfs.h>
  37 #include <linux/dma-buf.h>
  38 #include <linux/idr.h>
  39
  40 #include "ion.h"
  41 #include "ion_priv.h"
  42 #include "compat_ion.h"
  43
  44 bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
  45 {
  46         return (buffer->flags & ION_FLAG_CACHED) &&
  47                 !(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
  48 }
  49
  50 bool ion_buffer_cached(struct ion_buffer *buffer)
  51 {
  52         return !!(buffer->flags & ION_FLAG_CACHED);
  53 }
  54
  55 static inline struct page *ion_buffer_page(struct page *page)
  56 {
  57         return (struct page *)((unsigned long)page & ~(1UL));
  58 }
  59
  60 static inline bool ion_buffer_page_is_dirty(struct page *page)
  61 {
  62         return !!((unsigned long)page & 1UL);
  63 }
  64
  65 static inline void ion_buffer_page_dirty(struct page **page)
  66 {
  67         *page = (struct page *)((unsigned long)(*page) | 1UL);
  68 }
  69
  70 static inline void ion_buffer_page_clean(struct page **page)
  71 {
  72         *page = (struct page *)((unsigned long)(*page) & ~(1UL));
  73 }
  74
  75 /* this function should only be called while dev->lock is held */
  76 static void ion_buffer_add(struct ion_device *dev,
  77                            struct ion_buffer *buffer)
  78 {
  79         struct rb_node **p = &dev->buffers.rb_node;
  80         struct rb_node *parent = NULL;
  81         struct ion_buffer *entry;
  82
  83         while (*p) {
  84                 parent = *p;
  85                 entry = rb_entry(parent, struct ion_buffer, node);
  86
  87                 if (buffer < entry) {
  88                         p = &(*p)->rb_left;
  89                 } else if (buffer > entry) {
  90                         p = &(*p)->rb_right;
  91                 } else {
  92                         pr_err("%s: buffer already found.", __func__);
  93                         BUG();
  94                 }
  95         }
  96
  97         rb_link_node(&buffer->node, parent, p);
  98         rb_insert_color(&buffer->node, &dev->buffers);
  99 }
 100
 101 /* this function should only be called while dev->lock is held */
 102 static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 103                                             struct ion_device *dev,
 104                                             unsigned long len,
 105                                             unsigned long align,
 106                                             unsigned long flags)
 107 {
 108         struct ion_buffer *buffer;
 109         struct sg_table *table;
 110         struct scatterlist *sg;
 111         int i, ret;
 112
 113         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 114         if (!buffer)
 115                 return ERR_PTR(-ENOMEM);
 116
 117         buffer->heap = heap;
 118         buffer->flags = flags;
 119         kref_init(&buffer->ref);
 120
 121         ret = heap->ops->allocate(heap, buffer, len, align, flags);
 122
 123         if (ret) {
 124                 if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
 125                         goto err2;
 126
 127                 ion_heap_freelist_drain(heap, 0);
 128                 ret = heap->ops->allocate(heap, buffer, len, align,
 129                                           flags);
 130                 if (ret)
 131                         goto err2;
 132         }
 133
 134         if (buffer->sg_table == NULL) {
 135                 WARN_ONCE(1, "This heap needs to set the sgtable");
 136                 ret = -EINVAL;
 137                 goto err1;
 138         }
 139
 140         table = buffer->sg_table;
 141         buffer->dev = dev;
 142         buffer->size = len;
 143
 144         if (ion_buffer_fault_user_mappings(buffer)) {
 145                 int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 146                 struct scatterlist *sg;
 147                 int i, j, k = 0;
 148
 149                 buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
 150                 if (!buffer->pages) {
 151                         ret = -ENOMEM;
 152                         goto err1;
 153                 }
 154
 155                 for_each_sg(table->sgl, sg, table->nents, i) {
 156                         struct page *page = sg_page(sg);
 157
 158                         for (j = 0; j < sg->length / PAGE_SIZE; j++)
 159                                 buffer->pages[k++] = page++;
 160                 }
 161         }
 162
 163         buffer->dev = dev;
 164         buffer->size = len;
 165         INIT_LIST_HEAD(&buffer->vmas);
 166         mutex_init(&buffer->lock);
 167         /*
 168          * this will set up dma addresses for the sglist -- it is not
 169          * technically correct as per the dma api -- a specific
 170          * device isn't really taking ownership here.  However, in practice on
 171          * our systems the only dma_address space is physical addresses.
 172          * Additionally, we can't afford the overhead of invalidating every
 173          * allocation via dma_map_sg. The implicit contract here is that
 174          * memory coming from the heaps is ready for dma, ie if it has a
 175          * cached mapping that mapping has been invalidated
 176          */
 177         for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i) {
 178                 sg_dma_address(sg) = sg_phys(sg);
 179                 sg_dma_len(sg) = sg->length;
 180         }
 181         mutex_lock(&dev->buffer_lock);
 182         ion_buffer_add(dev, buffer);
 183         mutex_unlock(&dev->buffer_lock);
 184         return buffer;
 185
 186 err1:
 187         heap->ops->free(buffer);
 188 err2:
 189         kfree(buffer);
 190         return ERR_PTR(ret);
 191 }
 192
 193 void ion_buffer_destroy(struct ion_buffer *buffer)
 194 {
 195         if (WARN_ON(buffer->kmap_cnt > 0))
 196                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 197         buffer->heap->ops->free(buffer);
 198         vfree(buffer->pages);
 199         kfree(buffer);
 200 }
 201
 202 static void _ion_buffer_destroy(struct kref *kref)
 203 {
 204         struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
 205         struct ion_heap *heap = buffer->heap;
 206         struct ion_device *dev = buffer->dev;
 207
 208         mutex_lock(&dev->buffer_lock);
 209         rb_erase(&buffer->node, &dev->buffers);
 210         mutex_unlock(&dev->buffer_lock);
 211
 212         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
 213                 ion_heap_freelist_add(heap, buffer);
 214         else
 215                 ion_buffer_destroy(buffer);
 216 }
 217
 218 static void ion_buffer_get(struct ion_buffer *buffer)
 219 {
 220         kref_get(&buffer->ref);
 221 }
 222
 223 static int ion_buffer_put(struct ion_buffer *buffer)
 224 {
 225         return kref_put(&buffer->ref, _ion_buffer_destroy);
 226 }
 227
 228 static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
 229 {
 230         mutex_lock(&buffer->lock);
 231         buffer->handle_count++;
 232         mutex_unlock(&buffer->lock);
 233 }
 234
 235 static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
 236 {
 237         /*
 238          * when a buffer is removed from a handle, if it is not in
 239          * any other handles, copy the taskcomm and the pid of the
 240          * process it's being removed from into the buffer.  At this
 241          * point there will be no way to track what processes this buffer is
 242          * being used by, it only exists as a dma_buf file descriptor.
 243          * The taskcomm and pid can provide a debug hint as to where this fd
 244          * is in the system
 245          */
 246         mutex_lock(&buffer->lock);
 247         buffer->handle_count--;
 248         BUG_ON(buffer->handle_count < 0);
 249         if (!buffer->handle_count) {
 250                 struct task_struct *task;
 251
 252                 task = current->group_leader;
 253                 get_task_comm(buffer->task_comm, task);
 254                 buffer->pid = task_pid_nr(task);
 255         }
 256         mutex_unlock(&buffer->lock);
 257 }
 258
 259 static struct ion_handle *ion_handle_create(struct ion_client *client,
 260                                             struct ion_buffer *buffer)
 261 {
 262         struct ion_handle *handle;
 263
 264         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
 265         if (!handle)
 266                 return ERR_PTR(-ENOMEM);
 267         kref_init(&handle->ref);
 268         RB_CLEAR_NODE(&handle->node);
 269         handle->client = client;
 270         ion_buffer_get(buffer);
 271         ion_buffer_add_to_handle(buffer);
 272         handle->buffer = buffer;
 273
 274         return handle;
 275 }
 276
 277 static void ion_handle_kmap_put(struct ion_handle *);
 278
 279 static void ion_handle_destroy(struct kref *kref)
 280 {
 281         struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
 282         struct ion_client *client = handle->client;
 283         struct ion_buffer *buffer = handle->buffer;
 284
 285         mutex_lock(&buffer->lock);
 286         while (handle->kmap_cnt)
 287                 ion_handle_kmap_put(handle);
 288         mutex_unlock(&buffer->lock);
 289
 290         idr_remove(&client->idr, handle->id);
 291         if (!RB_EMPTY_NODE(&handle->node))
 292                 rb_erase(&handle->node, &client->handles);
 293
 294         ion_buffer_remove_from_handle(buffer);
 295         ion_buffer_put(buffer);
 296
 297         kfree(handle);
 298 }
 299
 300 static void ion_handle_get(struct ion_handle *handle)
 301 {
 302         kref_get(&handle->ref);
 303 }
 304
 305 int ion_handle_put_nolock(struct ion_handle *handle)
 306 {
 307         return kref_put(&handle->ref, ion_handle_destroy);
 308 }
 309
 310 int ion_handle_put(struct ion_handle *handle)
 311 {
 312         struct ion_client *client = handle->client;
 313         int ret;
 314
 315         mutex_lock(&client->lock);
 316         ret = ion_handle_put_nolock(handle);
 317         mutex_unlock(&client->lock);
 318
 319         return ret;
 320 }
 321
 322 static struct ion_handle *ion_handle_lookup(struct ion_client *client,
 323                                             struct ion_buffer *buffer)
 324 {
 325         struct rb_node *n = client->handles.rb_node;
 326
 327         while (n) {
 328                 struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
 329
 330                 if (buffer < entry->buffer)
 331                         n = n->rb_left;
 332                 else if (buffer > entry->buffer)
 333                         n = n->rb_right;
 334                 else
 335                         return entry;
 336         }
 337         return ERR_PTR(-EINVAL);
 338 }
 339
 340 struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
 341                                                int id)
 342 {
 343         struct ion_handle *handle;
 344
 345         handle = idr_find(&client->idr, id);
 346         if (handle)
 347                 ion_handle_get(handle);
 348
 349         return handle ? handle : ERR_PTR(-EINVAL);
 350 }
 351
 352 struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
 353                                                int id)
 354 {
 355         struct ion_handle *handle;
 356
 357         mutex_lock(&client->lock);
 358         handle = ion_handle_get_by_id_nolock(client, id);
 359         mutex_unlock(&client->lock);
 360
 361         return handle;
 362 }
 363
 364 static bool ion_handle_validate(struct ion_client *client,
 365                                 struct ion_handle *handle)
 366 {
 367         WARN_ON(!mutex_is_locked(&client->lock));
 368         return idr_find(&client->idr, handle->id) == handle;
 369 }
 370
 371 static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
 372 {
 373         int id;
 374         struct rb_node **p = &client->handles.rb_node;
 375         struct rb_node *parent = NULL;
 376         struct ion_handle *entry;
 377
 378         id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
 379         if (id < 0)
 380                 return id;
 381
 382         handle->id = id;
 383
 384         while (*p) {
 385                 parent = *p;
 386                 entry = rb_entry(parent, struct ion_handle, node);
 387
 388                 if (handle->buffer < entry->buffer)
 389                         p = &(*p)->rb_left;
 390                 else if (handle->buffer > entry->buffer)
 391                         p = &(*p)->rb_right;
 392                 else
 393                         WARN(1, "%s: buffer already found.", __func__);
 394         }
 395
 396         rb_link_node(&handle->node, parent, p);
 397         rb_insert_color(&handle->node, &client->handles);
 398
 399         return 0;
 400 }
 401
 402 struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
 403                              size_t align, unsigned int heap_id_mask,
 404                              unsigned int flags)
 405 {
 406         struct ion_handle *handle;
 407         struct ion_device *dev = client->dev;
 408         struct ion_buffer *buffer = NULL;
 409         struct ion_heap *heap;
 410         int ret;
 411
 412         pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
 413                  len, align, heap_id_mask, flags);
 414         /*
 415          * traverse the list of heaps available in this system in priority
 416          * order.  If the heap type is supported by the client, and matches the
 417          * request of the caller allocate from it.  Repeat until allocate has
 418          * succeeded or all heaps have been tried
 419          */
 420         len = PAGE_ALIGN(len);
 421
 422         if (!len)
 423                 return ERR_PTR(-EINVAL);
 424
 425         down_read(&dev->lock);
 426         plist_for_each_entry(heap, &dev->heaps, node) {
 427                 /* if the caller didn't specify this heap id */
 428                 if (!((1 << heap->id) & heap_id_mask))
 429                         continue;
 430                 buffer = ion_buffer_create(heap, dev, len, align, flags);
 431                 if (!IS_ERR(buffer))
 432                         break;
 433         }
 434         up_read(&dev->lock);
 435
 436         if (buffer == NULL)
 437                 return ERR_PTR(-ENODEV);
 438
 439         if (IS_ERR(buffer))
 440                 return ERR_CAST(buffer);
 441
 442         handle = ion_handle_create(client, buffer);
 443
 444         /*
 445          * ion_buffer_create will create a buffer with a ref_cnt of 1,
 446          * and ion_handle_create will take a second reference, drop one here
 447          */
 448         ion_buffer_put(buffer);
 449
 450         if (IS_ERR(handle))
 451                 return handle;
 452
 453         mutex_lock(&client->lock);
 454         ret = ion_handle_add(client, handle);
 455         mutex_unlock(&client->lock);
 456         if (ret) {
 457                 ion_handle_put(handle);
 458                 handle = ERR_PTR(ret);
 459         }
 460
 461         return handle;
 462 }
 463 EXPORT_SYMBOL(ion_alloc);
 464
 465 void ion_free_nolock(struct ion_client *client,
 466                      struct ion_handle *handle)
 467 {
 468         if (!ion_handle_validate(client, handle)) {
 469                 WARN(1, "%s: invalid handle passed to free.\n", __func__);
 470                 return;
 471         }
 472         ion_handle_put_nolock(handle);
 473 }
 474
 475 void ion_free(struct ion_client *client, struct ion_handle *handle)
 476 {
 477         BUG_ON(client != handle->client);
 478
 479         mutex_lock(&client->lock);
 480         ion_free_nolock(client, handle);
 481         mutex_unlock(&client->lock);
 482 }
 483 EXPORT_SYMBOL(ion_free);
 484
 485 static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
 486 {
 487         void *vaddr;
 488
 489         if (buffer->kmap_cnt) {
 490                 buffer->kmap_cnt++;
 491                 return buffer->vaddr;
 492         }
 493         vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
 494         if (WARN_ONCE(vaddr == NULL,
 495                       "heap->ops->map_kernel should return ERR_PTR on error"))
 496                 return ERR_PTR(-EINVAL);
 497         if (IS_ERR(vaddr))
 498                 return vaddr;
 499         buffer->vaddr = vaddr;
 500         buffer->kmap_cnt++;
 501         return vaddr;
 502 }
 503
 504 static void *ion_handle_kmap_get(struct ion_handle *handle)
 505 {
 506         struct ion_buffer *buffer = handle->buffer;
 507         void *vaddr;
 508
 509         if (handle->kmap_cnt) {
 510                 handle->kmap_cnt++;
 511                 return buffer->vaddr;
 512         }
 513         vaddr = ion_buffer_kmap_get(buffer);
 514         if (IS_ERR(vaddr))
 515                 return vaddr;
 516         handle->kmap_cnt++;
 517         return vaddr;
 518 }
 519
 520 static void ion_buffer_kmap_put(struct ion_buffer *buffer)
 521 {
 522         buffer->kmap_cnt--;
 523         if (!buffer->kmap_cnt) {
 524                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 525                 buffer->vaddr = NULL;
 526         }
 527 }
 528
 529 static void ion_handle_kmap_put(struct ion_handle *handle)
 530 {
 531         struct ion_buffer *buffer = handle->buffer;
 532
 533         if (!handle->kmap_cnt) {
 534                 WARN(1, "%s: Double unmap detected! bailing...\n", __func__);
 535                 return;
 536         }
 537         handle->kmap_cnt--;
 538         if (!handle->kmap_cnt)
 539                 ion_buffer_kmap_put(buffer);
 540 }
 541
 542 void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
 543 {
 544         struct ion_buffer *buffer;
 545         void *vaddr;
 546
 547         mutex_lock(&client->lock);
 548         if (!ion_handle_validate(client, handle)) {
 549                 pr_err("%s: invalid handle passed to map_kernel.\n",
 550                        __func__);
 551                 mutex_unlock(&client->lock);
 552                 return ERR_PTR(-EINVAL);
 553         }
 554
 555         buffer = handle->buffer;
 556
 557         if (!handle->buffer->heap->ops->map_kernel) {
 558                 pr_err("%s: map_kernel is not implemented by this heap.\n",
 559                        __func__);
 560                 mutex_unlock(&client->lock);
 561                 return ERR_PTR(-ENODEV);
 562         }
 563
 564         mutex_lock(&buffer->lock);
 565         vaddr = ion_handle_kmap_get(handle);
 566         mutex_unlock(&buffer->lock);
 567         mutex_unlock(&client->lock);
 568         return vaddr;
 569 }
 570 EXPORT_SYMBOL(ion_map_kernel);
 571
 572 void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
 573 {
 574         struct ion_buffer *buffer;
 575
 576         mutex_lock(&client->lock);
 577         buffer = handle->buffer;
 578         mutex_lock(&buffer->lock);
 579         ion_handle_kmap_put(handle);
 580         mutex_unlock(&buffer->lock);
 581         mutex_unlock(&client->lock);
 582 }
 583 EXPORT_SYMBOL(ion_unmap_kernel);
 584
 585 static struct mutex debugfs_mutex;
 586 static struct rb_root *ion_root_client;
 587 static int is_client_alive(struct ion_client *client)
 588 {
 589         struct rb_node *node;
 590         struct ion_client *tmp;
 591         struct ion_device *dev;
 592
 593         node = ion_root_client->rb_node;
 594         dev = container_of(ion_root_client, struct ion_device, clients);
 595
 596         down_read(&dev->lock);
 597         while (node) {
 598                 tmp = rb_entry(node, struct ion_client, node);
 599                 if (client < tmp) {
 600                         node = node->rb_left;
 601                 } else if (client > tmp) {
 602                         node = node->rb_right;
 603                 } else {
 604                         up_read(&dev->lock);
 605                         return 1;
 606                 }
 607         }
 608
 609         up_read(&dev->lock);
 610         return 0;
 611 }
 612
 613 static int ion_debug_client_show(struct seq_file *s, void *unused)
 614 {
 615         struct ion_client *client = s->private;
 616         struct rb_node *n;
 617         size_t sizes[ION_NUM_HEAP_IDS] = {0};
 618         const char *names[ION_NUM_HEAP_IDS] = {NULL};
 619         int i;
 620
 621         mutex_lock(&debugfs_mutex);
 622         if (!is_client_alive(client)) {
 623                 seq_printf(s, "ion_client 0x%p dead, can't dump its buffers\n",
 624                            client);
 625                 mutex_unlock(&debugfs_mutex);
 626                 return 0;
 627         }
 628
 629         mutex_lock(&client->lock);
 630         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
 631                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 632                                                      node);
 633                 unsigned int id = handle->buffer->heap->id;
 634
 635                 if (!names[id])
 636                         names[id] = handle->buffer->heap->name;
 637                 sizes[id] += handle->buffer->size;
 638         }
 639         mutex_unlock(&client->lock);
 640         mutex_unlock(&debugfs_mutex);
 641
 642         seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
 643         for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
 644                 if (!names[i])
 645                         continue;
 646                 seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
 647         }
 648         return 0;
 649 }
 650
 651 static int ion_debug_client_open(struct inode *inode, struct file *file)
 652 {
 653         return single_open(file, ion_debug_client_show, inode->i_private);
 654 }
 655
 656 static const struct file_operations debug_client_fops = {
 657         .open = ion_debug_client_open,
 658         .read = seq_read,
 659         .llseek = seq_lseek,
 660         .release = single_release,
 661 };
 662
 663 static int ion_get_client_serial(const struct rb_root *root,
 664                                  const unsigned char *name)
 665 {
 666         int serial = -1;
 667         struct rb_node *node;
 668
 669         for (node = rb_first(root); node; node = rb_next(node)) {
 670                 struct ion_client *client = rb_entry(node, struct ion_client,
 671                                                      node);
 672
 673                 if (strcmp(client->name, name))
 674                         continue;
 675                 serial = max(serial, client->display_serial);
 676         }
 677         return serial + 1;
 678 }
 679
 680 struct ion_client *ion_client_create(struct ion_device *dev,
 681                                      const char *name)
 682 {
 683         struct ion_client *client;
 684         struct task_struct *task;
 685         struct rb_node **p;
 686         struct rb_node *parent = NULL;
 687         struct ion_client *entry;
 688         pid_t pid;
 689
 690         if (!name) {
 691                 pr_err("%s: Name cannot be null\n", __func__);
 692                 return ERR_PTR(-EINVAL);
 693         }
 694
 695         get_task_struct(current->group_leader);
 696         task_lock(current->group_leader);
 697         pid = task_pid_nr(current->group_leader);
 698         /*
 699          * don't bother to store task struct for kernel threads,
 700          * they can't be killed anyway
 701          */
 702         if (current->group_leader->flags & PF_KTHREAD) {
 703                 put_task_struct(current->group_leader);
 704                 task = NULL;
 705         } else {
 706                 task = current->group_leader;
 707         }
 708         task_unlock(current->group_leader);
 709
 710         client = kzalloc(sizeof(*client), GFP_KERNEL);
 711         if (!client)
 712                 goto err_put_task_struct;
 713
 714         client->dev = dev;
 715         client->handles = RB_ROOT;
 716         idr_init(&client->idr);
 717         mutex_init(&client->lock);
 718         client->task = task;
 719         client->pid = pid;
 720         client->name = kstrdup(name, GFP_KERNEL);
 721         if (!client->name)
 722                 goto err_free_client;
 723
 724         down_write(&dev->lock);
 725         client->display_serial = ion_get_client_serial(&dev->clients, name);
 726         client->display_name = kasprintf(
 727                 GFP_KERNEL, "%s-%d", name, client->display_serial);
 728         if (!client->display_name) {
 729                 up_write(&dev->lock);
 730                 goto err_free_client_name;
 731         }
 732         p = &dev->clients.rb_node;
 733         while (*p) {
 734                 parent = *p;
 735                 entry = rb_entry(parent, struct ion_client, node);
 736
 737                 if (client < entry)
 738                         p = &(*p)->rb_left;
 739                 else if (client > entry)
 740                         p = &(*p)->rb_right;
 741         }
 742         rb_link_node(&client->node, parent, p);
 743         rb_insert_color(&client->node, &dev->clients);
 744
 745         client->debug_root = debugfs_create_file(client->display_name, 0664,
 746                                                  dev->clients_debug_root,
 747                                                  client, &debug_client_fops);
 748         if (!client->debug_root) {
 749                 char buf[256], *path;
 750
 751                 path = dentry_path(dev->clients_debug_root, buf, 256);
 752                 pr_err("Failed to create client debugfs at %s/%s\n",
 753                        path, client->display_name);
 754         }
 755
 756         up_write(&dev->lock);
 757
 758         return client;
 759
 760 err_free_client_name:
 761         kfree(client->name);
 762 err_free_client:
 763         kfree(client);
 764 err_put_task_struct:
 765         if (task)
 766                 put_task_struct(current->group_leader);
 767         return ERR_PTR(-ENOMEM);
 768 }
 769 EXPORT_SYMBOL(ion_client_create);
 770
 771 void ion_client_destroy(struct ion_client *client)
 772 {
 773         struct ion_device *dev = client->dev;
 774         struct rb_node *n;
 775
 776         pr_debug("%s: %d\n", __func__, __LINE__);
 777         mutex_lock(&debugfs_mutex);
 778         while ((n = rb_first(&client->handles))) {
 779                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 780                                                      node);
 781                 ion_handle_destroy(&handle->ref);
 782         }
 783
 784         idr_destroy(&client->idr);
 785
 786         down_write(&dev->lock);
 787         if (client->task)
 788                 put_task_struct(client->task);
 789         rb_erase(&client->node, &dev->clients);
 790         debugfs_remove_recursive(client->debug_root);
 791         up_write(&dev->lock);
 792
 793         kfree(client->display_name);
 794         kfree(client->name);
 795         kfree(client);
 796         mutex_unlock(&debugfs_mutex);
 797 }
 798 EXPORT_SYMBOL(ion_client_destroy);
 799
 800 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 801                                        struct device *dev,
 802                                        enum dma_data_direction direction);
 803
 804 static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
 805                                         enum dma_data_direction direction)
 806 {
 807         struct dma_buf *dmabuf = attachment->dmabuf;
 808         struct ion_buffer *buffer = dmabuf->priv;
 809
 810         ion_buffer_sync_for_device(buffer, attachment->dev, direction);
 811         return buffer->sg_table;
 812 }
 813
 814 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
 815                               struct sg_table *table,
 816                               enum dma_data_direction direction)
 817 {
 818 }
 819
 820 void ion_pages_sync_for_device(struct device *dev, struct page *page,
 821                                size_t size, enum dma_data_direction dir)
 822 {
 823         struct scatterlist sg;
 824
 825         sg_init_table(&sg, 1);
 826         sg_set_page(&sg, page, size, 0);
 827         /*
 828          * This is not correct - sg_dma_address needs a dma_addr_t that is valid
 829          * for the targeted device, but this works on the currently targeted
 830          * hardware.
 831          */
 832         sg_dma_address(&sg) = page_to_phys(page);
 833         dma_sync_sg_for_device(dev, &sg, 1, dir);
 834 }
 835
 836 struct ion_vma_list {
 837         struct list_head list;
 838         struct vm_area_struct *vma;
 839 };
 840
 841 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 842                                        struct device *dev,
 843                                        enum dma_data_direction dir)
 844 {
 845         struct ion_vma_list *vma_list;
 846         int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 847         int i;
 848
 849         pr_debug("%s: syncing for device %s\n", __func__,
 850                  dev ? dev_name(dev) : "null");
 851
 852         if (!ion_buffer_fault_user_mappings(buffer))
 853                 return;
 854
 855         mutex_lock(&buffer->lock);
 856         for (i = 0; i < pages; i++) {
 857                 struct page *page = buffer->pages[i];
 858
 859                 if (ion_buffer_page_is_dirty(page))
 860                         ion_pages_sync_for_device(dev, ion_buffer_page(page),
 861                                                   PAGE_SIZE, dir);
 862
 863                 ion_buffer_page_clean(buffer->pages + i);
 864         }
 865         list_for_each_entry(vma_list, &buffer->vmas, list) {
 866                 struct vm_area_struct *vma = vma_list->vma;
 867
 868                 zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
 869                                NULL);
 870         }
 871         mutex_unlock(&buffer->lock);
 872 }
 873
 874 static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 875 {
 876         struct ion_buffer *buffer = vma->vm_private_data;
 877         unsigned long pfn;
 878         int ret;
 879
 880         mutex_lock(&buffer->lock);
 881         ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
 882         BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
 883
 884         pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
 885         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
 886         mutex_unlock(&buffer->lock);
 887         if (ret)
 888                 return VM_FAULT_ERROR;
 889
 890         return VM_FAULT_NOPAGE;
 891 }
 892
 893 static void ion_vm_open(struct vm_area_struct *vma)
 894 {
 895         struct ion_buffer *buffer = vma->vm_private_data;
 896         struct ion_vma_list *vma_list;
 897
 898         vma_list = kmalloc(sizeof(*vma_list), GFP_KERNEL);
 899         if (!vma_list)
 900                 return;
 901         vma_list->vma = vma;
 902         mutex_lock(&buffer->lock);
 903         list_add(&vma_list->list, &buffer->vmas);
 904         mutex_unlock(&buffer->lock);
 905         pr_debug("%s: adding %p\n", __func__, vma);
 906 }
 907
 908 static void ion_vm_close(struct vm_area_struct *vma)
 909 {
 910         struct ion_buffer *buffer = vma->vm_private_data;
 911         struct ion_vma_list *vma_list, *tmp;
 912
 913         pr_debug("%s\n", __func__);
 914         mutex_lock(&buffer->lock);
 915         list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
 916                 if (vma_list->vma != vma)
 917                         continue;
 918                 list_del(&vma_list->list);
 919                 kfree(vma_list);
 920                 pr_debug("%s: deleting %p\n", __func__, vma);
 921                 break;
 922         }
 923         mutex_unlock(&buffer->lock);
 924 }
 925
 926 static const struct vm_operations_struct ion_vma_ops = {
 927         .open = ion_vm_open,
 928         .close = ion_vm_close,
 929         .fault = ion_vm_fault,
 930 };
 931
 932 static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
 933 {
 934         struct ion_buffer *buffer = dmabuf->priv;
 935         int ret = 0;
 936
 937         if (!buffer->heap->ops->map_user) {
 938                 pr_err("%s: this heap does not define a method for mapping to userspace\n",
 939                        __func__);
 940                 return -EINVAL;
 941         }
 942
 943         if (ion_buffer_fault_user_mappings(buffer)) {
 944                 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
 945                                                         VM_DONTDUMP;
 946                 vma->vm_private_data = buffer;
 947                 vma->vm_ops = &ion_vma_ops;
 948                 ion_vm_open(vma);
 949                 return 0;
 950         }
 951
 952         if (!(buffer->flags & ION_FLAG_CACHED))
 953                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 954
 955         mutex_lock(&buffer->lock);
 956         /* now map it to userspace */
 957         ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
 958         mutex_unlock(&buffer->lock);
 959
 960         if (ret)
 961                 pr_err("%s: failure mapping buffer to userspace\n",
 962                        __func__);
 963
 964         return ret;
 965 }
 966
 967 static void ion_dma_buf_release(struct dma_buf *dmabuf)
 968 {
 969         struct ion_buffer *buffer = dmabuf->priv;
 970
 971         ion_buffer_put(buffer);
 972 }
 973
 974 static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
 975 {
 976         struct ion_buffer *buffer = dmabuf->priv;
 977
 978         return buffer->vaddr + offset * PAGE_SIZE;
 979 }
 980
 981 static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
 982                                void *ptr)
 983 {
 984 }
 985
 986 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
 987                                         enum dma_data_direction direction)
 988 {
 989         struct ion_buffer *buffer = dmabuf->priv;
 990         void *vaddr;
 991
 992         if (!buffer->heap->ops->map_kernel) {
 993                 pr_err("%s: map kernel is not implemented by this heap.\n",
 994                        __func__);
 995                 return -ENODEV;
 996         }
 997
 998         mutex_lock(&buffer->lock);
 999         vaddr = ion_buffer_kmap_get(buffer);
1000         mutex_unlock(&buffer->lock);
1001         return PTR_ERR_OR_ZERO(vaddr);
1002 }
1003
1004 static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
1005                                       enum dma_data_direction direction)
1006 {
1007         struct ion_buffer *buffer = dmabuf->priv;
1008
1009         mutex_lock(&buffer->lock);
1010         ion_buffer_kmap_put(buffer);
1011         mutex_unlock(&buffer->lock);
1012
1013         return 0;
1014 }
1015
1016 static struct dma_buf_ops dma_buf_ops = {
1017         .map_dma_buf = ion_map_dma_buf,
1018         .unmap_dma_buf = ion_unmap_dma_buf,
1019         .mmap = ion_mmap,
1020         .release = ion_dma_buf_release,
1021         .begin_cpu_access = ion_dma_buf_begin_cpu_access,
1022         .end_cpu_access = ion_dma_buf_end_cpu_access,
1023         .kmap_atomic = ion_dma_buf_kmap,
1024         .kunmap_atomic = ion_dma_buf_kunmap,
1025         .kmap = ion_dma_buf_kmap,
1026         .kunmap = ion_dma_buf_kunmap,
1027 };
1028
1029 struct dma_buf *ion_share_dma_buf(struct ion_client *client,
1030                                   struct ion_handle *handle)
1031 {
1032         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1033         struct ion_buffer *buffer;
1034         struct dma_buf *dmabuf;
1035         bool valid_handle;
1036
1037         mutex_lock(&client->lock);
1038         valid_handle = ion_handle_validate(client, handle);
1039         if (!valid_handle) {
1040                 WARN(1, "%s: invalid handle passed to share.\n", __func__);
1041                 mutex_unlock(&client->lock);
1042                 return ERR_PTR(-EINVAL);
1043         }
1044         buffer = handle->buffer;
1045         ion_buffer_get(buffer);
1046         mutex_unlock(&client->lock);
1047
1048         exp_info.ops = &dma_buf_ops;
1049         exp_info.size = buffer->size;
1050         exp_info.flags = O_RDWR;
1051         exp_info.priv = buffer;
1052
1053         dmabuf = dma_buf_export(&exp_info);
1054         if (IS_ERR(dmabuf)) {
1055                 ion_buffer_put(buffer);
1056                 return dmabuf;
1057         }
1058
1059         return dmabuf;
1060 }
1061 EXPORT_SYMBOL(ion_share_dma_buf);
1062
1063 int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
1064 {
1065         struct dma_buf *dmabuf;
1066         int fd;
1067
1068         dmabuf = ion_share_dma_buf(client, handle);
1069         if (IS_ERR(dmabuf))
1070                 return PTR_ERR(dmabuf);
1071
1072         fd = dma_buf_fd(dmabuf, O_CLOEXEC);
1073         if (fd < 0)
1074                 dma_buf_put(dmabuf);
1075
1076         return fd;
1077 }
1078 EXPORT_SYMBOL(ion_share_dma_buf_fd);
1079
1080 struct ion_handle *ion_import_dma_buf(struct ion_client *client,
1081                                       struct dma_buf *dmabuf)
1082 {
1083         struct ion_buffer *buffer;
1084         struct ion_handle *handle;
1085         int ret;
1086
1087         /* if this memory came from ion */
1088
1089         if (dmabuf->ops != &dma_buf_ops) {
1090                 pr_err("%s: can not import dmabuf from another exporter\n",
1091                        __func__);
1092                 return ERR_PTR(-EINVAL);
1093         }
1094         buffer = dmabuf->priv;
1095
1096         mutex_lock(&client->lock);
1097         /* if a handle exists for this buffer just take a reference to it */
1098         handle = ion_handle_lookup(client, buffer);
1099         if (!IS_ERR(handle)) {
1100                 ion_handle_get(handle);
1101                 mutex_unlock(&client->lock);
1102                 goto end;
1103         }
1104
1105         handle = ion_handle_create(client, buffer);
1106         if (IS_ERR(handle)) {
1107                 mutex_unlock(&client->lock);
1108                 goto end;
1109         }
1110
1111         ret = ion_handle_add(client, handle);
1112         mutex_unlock(&client->lock);
1113         if (ret) {
1114                 ion_handle_put(handle);
1115                 handle = ERR_PTR(ret);
1116         }
1117
1118 end:
1119         return handle;
1120 }
1121 EXPORT_SYMBOL(ion_import_dma_buf);
1122
1123 struct ion_handle *ion_import_dma_buf_fd(struct ion_client *client, int fd)
1124 {
1125         struct dma_buf *dmabuf;
1126         struct ion_handle *handle;
1127
1128         dmabuf = dma_buf_get(fd);
1129         if (IS_ERR(dmabuf))
1130                 return ERR_CAST(dmabuf);
1131
1132         handle = ion_import_dma_buf(client, dmabuf);
1133         dma_buf_put(dmabuf);
1134         return handle;
1135 }
1136 EXPORT_SYMBOL(ion_import_dma_buf_fd);
1137
1138 int ion_sync_for_device(struct ion_client *client, int fd)
1139 {
1140         struct dma_buf *dmabuf;
1141         struct ion_buffer *buffer;
1142
1143         dmabuf = dma_buf_get(fd);
1144         if (IS_ERR(dmabuf))
1145                 return PTR_ERR(dmabuf);
1146
1147         /* if this memory came from ion */
1148         if (dmabuf->ops != &dma_buf_ops) {
1149                 pr_err("%s: can not sync dmabuf from another exporter\n",
1150                        __func__);
1151                 dma_buf_put(dmabuf);
1152                 return -EINVAL;
1153         }
1154         buffer = dmabuf->priv;
1155
1156         dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
1157                                buffer->sg_table->nents, DMA_BIDIRECTIONAL);
1158         dma_buf_put(dmabuf);
1159         return 0;
1160 }
1161
1162 int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
1163 {
1164         struct ion_device *dev = client->dev;
1165         struct ion_heap_data __user *buffer = u64_to_user_ptr(query->heaps);
1166         int ret = -EINVAL, cnt = 0, max_cnt;
1167         struct ion_heap *heap;
1168         struct ion_heap_data hdata;
1169
1170         memset(&hdata, 0, sizeof(hdata));
1171
1172         down_read(&dev->lock);
1173         if (!buffer) {
1174                 query->cnt = dev->heap_cnt;
1175                 ret = 0;
1176                 goto out;
1177         }
1178
1179         if (query->cnt <= 0)
1180                 goto out;
1181
1182         max_cnt = query->cnt;
1183
1184         plist_for_each_entry(heap, &dev->heaps, node) {
1185                 strncpy(hdata.name, heap->name, MAX_HEAP_NAME);
1186                 hdata.name[sizeof(hdata.name) - 1] = '\0';
1187                 hdata.type = heap->type;
1188                 hdata.heap_id = heap->id;
1189
1190                 if (copy_to_user(&buffer[cnt], &hdata, sizeof(hdata))) {
1191                         ret = -EFAULT;
1192                         goto out;
1193                 }
1194
1195                 cnt++;
1196                 if (cnt >= max_cnt)
1197                         break;
1198         }
1199
1200         query->cnt = cnt;
1201 out:
1202         up_read(&dev->lock);
1203         return ret;
1204 }
1205
1206 static int ion_release(struct inode *inode, struct file *file)
1207 {
1208         struct ion_client *client = file->private_data;
1209
1210         pr_debug("%s: %d\n", __func__, __LINE__);
1211         ion_client_destroy(client);
1212         return 0;
1213 }
1214
1215 static int ion_open(struct inode *inode, struct file *file)
1216 {
1217         struct miscdevice *miscdev = file->private_data;
1218         struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
1219         struct ion_client *client;
1220         char debug_name[64];
1221
1222         pr_debug("%s: %d\n", __func__, __LINE__);
1223         snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
1224         client = ion_client_create(dev, debug_name);
1225         if (IS_ERR(client))
1226                 return PTR_ERR(client);
1227         file->private_data = client;
1228
1229         return 0;
1230 }
1231
1232 static const struct file_operations ion_fops = {
1233         .owner          = THIS_MODULE,
1234         .open           = ion_open,
1235         .release        = ion_release,
1236         .unlocked_ioctl = ion_ioctl,
1237         .compat_ioctl   = compat_ion_ioctl,
1238 };
1239
1240 static size_t ion_debug_heap_total(struct ion_client *client,
1241                                    unsigned int id)
1242 {
1243         size_t size = 0;
1244         struct rb_node *n;
1245
1246         mutex_lock(&client->lock);
1247         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1248                 struct ion_handle *handle = rb_entry(n,
1249                                                      struct ion_handle,
1250                                                      node);
1251                 if (handle->buffer->heap->id == id)
1252                         size += handle->buffer->size;
1253         }
1254         mutex_unlock(&client->lock);
1255         return size;
1256 }
1257
1258 static int ion_debug_heap_show(struct seq_file *s, void *unused)
1259 {
1260         struct ion_heap *heap = s->private;
1261         struct ion_device *dev = heap->dev;
1262         struct rb_node *n;
1263         size_t total_size = 0;
1264         size_t total_orphaned_size = 0;
1265
1266         seq_printf(s, "%16s %16s %16s\n", "client", "pid", "size");
1267         seq_puts(s, "----------------------------------------------------\n");
1268
1269         mutex_lock(&debugfs_mutex);
1270         for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
1271                 struct ion_client *client = rb_entry(n, struct ion_client,
1272                                                      node);
1273                 size_t size = ion_debug_heap_total(client, heap->id);
1274
1275                 if (!size)
1276                         continue;
1277                 if (client->task) {
1278                         char task_comm[TASK_COMM_LEN];
1279
1280                         get_task_comm(task_comm, client->task);
1281                         seq_printf(s, "%16s %16u %16zu\n", task_comm,
1282                                    client->pid, size);
1283                 } else {
1284                         seq_printf(s, "%16s %16u %16zu\n", client->name,
1285                                    client->pid, size);
1286                 }
1287         }
1288         mutex_unlock(&debugfs_mutex);
1289
1290         seq_puts(s, "----------------------------------------------------\n");
1291         seq_puts(s, "orphaned allocations (info is from last known client):\n");
1292         mutex_lock(&dev->buffer_lock);
1293         for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
1294                 struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
1295                                                      node);
1296                 if (buffer->heap->id != heap->id)
1297                         continue;
1298                 total_size += buffer->size;
1299                 if (!buffer->handle_count) {
1300                         seq_printf(s, "%16s %16u %16zu %d %d\n",
1301                                    buffer->task_comm, buffer->pid,
1302                                    buffer->size, buffer->kmap_cnt,
1303                                    atomic_read(&buffer->ref.refcount));
1304                         total_orphaned_size += buffer->size;
1305                 }
1306         }
1307         mutex_unlock(&dev->buffer_lock);
1308         seq_puts(s, "----------------------------------------------------\n");
1309         seq_printf(s, "%16s %16zu\n", "total orphaned",
1310                    total_orphaned_size);
1311         seq_printf(s, "%16s %16zu\n", "total ", total_size);
1312         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1313                 seq_printf(s, "%16s %16zu\n", "deferred free",
1314                            heap->free_list_size);
1315         seq_puts(s, "----------------------------------------------------\n");
1316
1317         if (heap->debug_show)
1318                 heap->debug_show(heap, s, unused);
1319
1320         return 0;
1321 }
1322
1323 static int ion_debug_heap_open(struct inode *inode, struct file *file)
1324 {
1325         return single_open(file, ion_debug_heap_show, inode->i_private);
1326 }
1327
1328 static const struct file_operations debug_heap_fops = {
1329         .open = ion_debug_heap_open,
1330         .read = seq_read,
1331         .llseek = seq_lseek,
1332         .release = single_release,
1333 };
1334
1335 static int debug_shrink_set(void *data, u64 val)
1336 {
1337         struct ion_heap *heap = data;
1338         struct shrink_control sc;
1339         int objs;
1340
1341         sc.gfp_mask = GFP_HIGHUSER;
1342         sc.nr_to_scan = val;
1343
1344         if (!val) {
1345                 objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1346                 sc.nr_to_scan = objs;
1347         }
1348
1349         heap->shrinker.scan_objects(&heap->shrinker, &sc);
1350         return 0;
1351 }
1352
1353 static int debug_shrink_get(void *data, u64 *val)
1354 {
1355         struct ion_heap *heap = data;
1356         struct shrink_control sc;
1357         int objs;
1358
1359         sc.gfp_mask = GFP_HIGHUSER;
1360         sc.nr_to_scan = 0;
1361
1362         objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1363         *val = objs;
1364         return 0;
1365 }
1366
1367 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
1368                         debug_shrink_set, "%llu\n");
1369
1370 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
1371 {
1372         struct dentry *debug_file;
1373
1374         if (!heap->ops->allocate || !heap->ops->free)
1375                 pr_err("%s: can not add heap with invalid ops struct.\n",
1376                        __func__);
1377
1378         spin_lock_init(&heap->free_lock);
1379         heap->free_list_size = 0;
1380
1381         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1382                 ion_heap_init_deferred_free(heap);
1383
1384         if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
1385                 ion_heap_init_shrinker(heap);
1386
1387         heap->dev = dev;
1388         down_write(&dev->lock);
1389         /*
1390          * use negative heap->id to reverse the priority -- when traversing
1391          * the list later attempt higher id numbers first
1392          */
1393         plist_node_init(&heap->node, -heap->id);
1394         plist_add(&heap->node, &dev->heaps);
1395         debug_file = debugfs_create_file(heap->name, 0664,
1396                                          dev->heaps_debug_root, heap,
1397                                          &debug_heap_fops);
1398
1399         if (!debug_file) {
1400                 char buf[256], *path;
1401
1402                 path = dentry_path(dev->heaps_debug_root, buf, 256);
1403                 pr_err("Failed to create heap debugfs at %s/%s\n",
1404                        path, heap->name);
1405         }
1406
1407         if (heap->shrinker.count_objects && heap->shrinker.scan_objects) {
1408                 char debug_name[64];
1409
1410                 snprintf(debug_name, 64, "%s_shrink", heap->name);
1411                 debug_file = debugfs_create_file(
1412                         debug_name, 0644, dev->heaps_debug_root, heap,
1413                         &debug_shrink_fops);
1414                 if (!debug_file) {
1415                         char buf[256], *path;
1416
1417                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1418                         pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
1419                                path, debug_name);
1420                 }
1421         }
1422
1423         dev->heap_cnt++;
1424         up_write(&dev->lock);
1425 }
1426 EXPORT_SYMBOL(ion_device_add_heap);
1427
1428 struct ion_device *ion_device_create(long (*custom_ioctl)
1429                                      (struct ion_client *client,
1430                                       unsigned int cmd,
1431                                       unsigned long arg))
1432 {
1433         struct ion_device *idev;
1434         int ret;
1435
1436         idev = kzalloc(sizeof(*idev), GFP_KERNEL);
1437         if (!idev)
1438                 return ERR_PTR(-ENOMEM);
1439
1440         idev->dev.minor = MISC_DYNAMIC_MINOR;
1441         idev->dev.name = "ion";
1442         idev->dev.fops = &ion_fops;
1443         idev->dev.parent = NULL;
1444         ret = misc_register(&idev->dev);
1445         if (ret) {
1446                 pr_err("ion: failed to register misc device.\n");
1447                 kfree(idev);
1448                 return ERR_PTR(ret);
1449         }
1450
1451         idev->debug_root = debugfs_create_dir("ion", NULL);
1452         if (!idev->debug_root) {
1453                 pr_err("ion: failed to create debugfs root directory.\n");
1454                 goto debugfs_done;
1455         }
1456         idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
1457         if (!idev->heaps_debug_root) {
1458                 pr_err("ion: failed to create debugfs heaps directory.\n");
1459                 goto debugfs_done;
1460         }
1461         idev->clients_debug_root = debugfs_create_dir("clients",
1462                                                 idev->debug_root);
1463         if (!idev->clients_debug_root)
1464                 pr_err("ion: failed to create debugfs clients directory.\n");
1465
1466 debugfs_done:
1467
1468         idev->custom_ioctl = custom_ioctl;
1469         idev->buffers = RB_ROOT;
1470         mutex_init(&idev->buffer_lock);
1471         init_rwsem(&idev->lock);
1472         plist_head_init(&idev->heaps);
1473         idev->clients = RB_ROOT;
1474         ion_root_client = &idev->clients;
1475         mutex_init(&debugfs_mutex);
1476         return idev;
1477 }
1478 EXPORT_SYMBOL(ion_device_create);
1479
1480 void ion_device_destroy(struct ion_device *dev)
1481 {
1482         misc_deregister(&dev->dev);
1483         debugfs_remove_recursive(dev->debug_root);
1484         /* XXX need to free the heaps and clients ? */
1485         kfree(dev);
1486 }
1487 EXPORT_SYMBOL(ion_device_destroy);