drivers/staging/android/ion/ion.c

   1 /*
   2
   3  * drivers/gpu/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/file.h>
  20 #include <linux/freezer.h>
  21 #include <linux/fs.h>
  22 #include <linux/anon_inodes.h>
  23 #include <linux/kthread.h>
  24 #include <linux/list.h>
  25 #include <linux/memblock.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/export.h>
  28 #include <linux/mm.h>
  29 #include <linux/mm_types.h>
  30 #include <linux/rbtree.h>
  31 #include <linux/slab.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/debugfs.h>
  36 #include <linux/dma-buf.h>
  37 #include <linux/idr.h>
  38
  39 #include "ion.h"
  40 #include "ion_priv.h"
  41 #include "compat_ion.h"
  42
  43 /**
  44  * struct ion_device - the metadata of the ion device node
  45  * @dev:                the actual misc device
  46  * @buffers:            an rb tree of all the existing buffers
  47  * @buffer_lock:        lock protecting the tree of buffers
  48  * @lock:               rwsem protecting the tree of heaps and clients
  49  * @heaps:              list of all the heaps in the system
  50  * @user_clients:       list of all the clients created from userspace
  51  */
  52 struct ion_device {
  53         struct miscdevice dev;
  54         struct rb_root buffers;
  55         struct mutex buffer_lock;
  56         struct rw_semaphore lock;
  57         struct plist_head heaps;
  58         long (*custom_ioctl) (struct ion_client *client, unsigned int cmd,
  59                               unsigned long arg);
  60         struct rb_root clients;
  61         struct dentry *debug_root;
  62         struct dentry *heaps_debug_root;
  63         struct dentry *clients_debug_root;
  64 };
  65
  66 /**
  67  * struct ion_client - a process/hw block local address space
  68  * @node:               node in the tree of all clients
  69  * @dev:                backpointer to ion device
  70  * @handles:            an rb tree of all the handles in this client
  71  * @idr:                an idr space for allocating handle ids
  72  * @lock:               lock protecting the tree of handles
  73  * @name:               used for debugging
  74  * @display_name:       used for debugging (unique version of @name)
  75  * @display_serial:     used for debugging (to make display_name unique)
  76  * @task:               used for debugging
  77  *
  78  * A client represents a list of buffers this client may access.
  79  * The mutex stored here is used to protect both handles tree
  80  * as well as the handles themselves, and should be held while modifying either.
  81  */
  82 struct ion_client {
  83         struct rb_node node;
  84         struct ion_device *dev;
  85         struct rb_root handles;
  86         struct idr idr;
  87         struct mutex lock;
  88         const char *name;
  89         char *display_name;
  90         int display_serial;
  91         struct task_struct *task;
  92         pid_t pid;
  93         struct dentry *debug_root;
  94 };
  95
  96 /**
  97  * ion_handle - a client local reference to a buffer
  98  * @ref:                reference count
  99  * @client:             back pointer to the client the buffer resides in
 100  * @buffer:             pointer to the buffer
 101  * @node:               node in the client's handle rbtree
 102  * @kmap_cnt:           count of times this client has mapped to kernel
 103  * @id:                 client-unique id allocated by client->idr
 104  *
 105  * Modifications to node, map_cnt or mapping should be protected by the
 106  * lock in the client.  Other fields are never changed after initialization.
 107  */
 108 struct ion_handle {
 109         struct kref ref;
 110         struct ion_client *client;
 111         struct ion_buffer *buffer;
 112         struct rb_node node;
 113         unsigned int kmap_cnt;
 114         int id;
 115 };
 116
 117 bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
 118 {
 119         return (buffer->flags & ION_FLAG_CACHED) &&
 120                 !(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
 121 }
 122
 123 bool ion_buffer_cached(struct ion_buffer *buffer)
 124 {
 125         return !!(buffer->flags & ION_FLAG_CACHED);
 126 }
 127
 128 static inline struct page *ion_buffer_page(struct page *page)
 129 {
 130         return (struct page *)((unsigned long)page & ~(1UL));
 131 }
 132
 133 static inline bool ion_buffer_page_is_dirty(struct page *page)
 134 {
 135         return !!((unsigned long)page & 1UL);
 136 }
 137
 138 static inline void ion_buffer_page_dirty(struct page **page)
 139 {
 140         *page = (struct page *)((unsigned long)(*page) | 1UL);
 141 }
 142
 143 static inline void ion_buffer_page_clean(struct page **page)
 144 {
 145         *page = (struct page *)((unsigned long)(*page) & ~(1UL));
 146 }
 147
 148 /* this function should only be called while dev->lock is held */
 149 static void ion_buffer_add(struct ion_device *dev,
 150                            struct ion_buffer *buffer)
 151 {
 152         struct rb_node **p = &dev->buffers.rb_node;
 153         struct rb_node *parent = NULL;
 154         struct ion_buffer *entry;
 155
 156         while (*p) {
 157                 parent = *p;
 158                 entry = rb_entry(parent, struct ion_buffer, node);
 159
 160                 if (buffer < entry) {
 161                         p = &(*p)->rb_left;
 162                 } else if (buffer > entry) {
 163                         p = &(*p)->rb_right;
 164                 } else {
 165                         pr_err("%s: buffer already found.", __func__);
 166                         BUG();
 167                 }
 168         }
 169
 170         rb_link_node(&buffer->node, parent, p);
 171         rb_insert_color(&buffer->node, &dev->buffers);
 172 }
 173
 174 /* this function should only be called while dev->lock is held */
 175 static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 176                                      struct ion_device *dev,
 177                                      unsigned long len,
 178                                      unsigned long align,
 179                                      unsigned long flags)
 180 {
 181         struct ion_buffer *buffer;
 182         struct sg_table *table;
 183         struct scatterlist *sg;
 184         int i, ret;
 185
 186         buffer = kzalloc(sizeof(struct ion_buffer), GFP_KERNEL);
 187         if (!buffer)
 188                 return ERR_PTR(-ENOMEM);
 189
 190         buffer->heap = heap;
 191         buffer->flags = flags;
 192         kref_init(&buffer->ref);
 193
 194         ret = heap->ops->allocate(heap, buffer, len, align, flags);
 195
 196         if (ret) {
 197                 if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
 198                         goto err2;
 199
 200                 ion_heap_freelist_drain(heap, 0);
 201                 ret = heap->ops->allocate(heap, buffer, len, align,
 202                                           flags);
 203                 if (ret)
 204                         goto err2;
 205         }
 206
 207         buffer->dev = dev;
 208         buffer->size = len;
 209
 210         table = heap->ops->map_dma(heap, buffer);
 211         if (WARN_ONCE(table == NULL,
 212                         "heap->ops->map_dma should return ERR_PTR on error"))
 213                 table = ERR_PTR(-EINVAL);
 214         if (IS_ERR(table)) {
 215                 heap->ops->free(buffer);
 216                 kfree(buffer);
 217                 return ERR_PTR(PTR_ERR(table));
 218         }
 219         buffer->sg_table = table;
 220         if (ion_buffer_fault_user_mappings(buffer)) {
 221                 int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 222                 struct scatterlist *sg;
 223                 int i, j, k = 0;
 224
 225                 buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
 226                 if (!buffer->pages) {
 227                         ret = -ENOMEM;
 228                         goto err1;
 229                 }
 230
 231                 for_each_sg(table->sgl, sg, table->nents, i) {
 232                         struct page *page = sg_page(sg);
 233
 234                         for (j = 0; j < sg->length / PAGE_SIZE; j++)
 235                                 buffer->pages[k++] = page++;
 236                 }
 237
 238                 if (ret)
 239                         goto err;
 240         }
 241
 242         buffer->dev = dev;
 243         buffer->size = len;
 244         INIT_LIST_HEAD(&buffer->vmas);
 245         mutex_init(&buffer->lock);
 246         /* this will set up dma addresses for the sglist -- it is not
 247            technically correct as per the dma api -- a specific
 248            device isn't really taking ownership here.  However, in practice on
 249            our systems the only dma_address space is physical addresses.
 250            Additionally, we can't afford the overhead of invalidating every
 251            allocation via dma_map_sg. The implicit contract here is that
 252            memory comming from the heaps is ready for dma, ie if it has a
 253            cached mapping that mapping has been invalidated */
 254         for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i)
 255                 sg_dma_address(sg) = sg_phys(sg);
 256         mutex_lock(&dev->buffer_lock);
 257         ion_buffer_add(dev, buffer);
 258         mutex_unlock(&dev->buffer_lock);
 259         return buffer;
 260
 261 err:
 262         heap->ops->unmap_dma(heap, buffer);
 263         heap->ops->free(buffer);
 264 err1:
 265         if (buffer->pages)
 266                 vfree(buffer->pages);
 267 err2:
 268         kfree(buffer);
 269         return ERR_PTR(ret);
 270 }
 271
 272 void ion_buffer_destroy(struct ion_buffer *buffer)
 273 {
 274         if (WARN_ON(buffer->kmap_cnt > 0))
 275                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 276         buffer->heap->ops->unmap_dma(buffer->heap, buffer);
 277         buffer->heap->ops->free(buffer);
 278         if (buffer->pages)
 279                 vfree(buffer->pages);
 280         kfree(buffer);
 281 }
 282
 283 static void _ion_buffer_destroy(struct kref *kref)
 284 {
 285         struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
 286         struct ion_heap *heap = buffer->heap;
 287         struct ion_device *dev = buffer->dev;
 288
 289         mutex_lock(&dev->buffer_lock);
 290         rb_erase(&buffer->node, &dev->buffers);
 291         mutex_unlock(&dev->buffer_lock);
 292
 293         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
 294                 ion_heap_freelist_add(heap, buffer);
 295         else
 296                 ion_buffer_destroy(buffer);
 297 }
 298
 299 static void ion_buffer_get(struct ion_buffer *buffer)
 300 {
 301         kref_get(&buffer->ref);
 302 }
 303
 304 static int ion_buffer_put(struct ion_buffer *buffer)
 305 {
 306         return kref_put(&buffer->ref, _ion_buffer_destroy);
 307 }
 308
 309 static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
 310 {
 311         mutex_lock(&buffer->lock);
 312         buffer->handle_count++;
 313         mutex_unlock(&buffer->lock);
 314 }
 315
 316 static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
 317 {
 318         /*
 319          * when a buffer is removed from a handle, if it is not in
 320          * any other handles, copy the taskcomm and the pid of the
 321          * process it's being removed from into the buffer.  At this
 322          * point there will be no way to track what processes this buffer is
 323          * being used by, it only exists as a dma_buf file descriptor.
 324          * The taskcomm and pid can provide a debug hint as to where this fd
 325          * is in the system
 326          */
 327         mutex_lock(&buffer->lock);
 328         buffer->handle_count--;
 329         BUG_ON(buffer->handle_count < 0);
 330         if (!buffer->handle_count) {
 331                 struct task_struct *task;
 332
 333                 task = current->group_leader;
 334                 get_task_comm(buffer->task_comm, task);
 335                 buffer->pid = task_pid_nr(task);
 336         }
 337         mutex_unlock(&buffer->lock);
 338 }
 339
 340 static struct ion_handle *ion_handle_create(struct ion_client *client,
 341                                      struct ion_buffer *buffer)
 342 {
 343         struct ion_handle *handle;
 344
 345         handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
 346         if (!handle)
 347                 return ERR_PTR(-ENOMEM);
 348         kref_init(&handle->ref);
 349         RB_CLEAR_NODE(&handle->node);
 350         handle->client = client;
 351         ion_buffer_get(buffer);
 352         ion_buffer_add_to_handle(buffer);
 353         handle->buffer = buffer;
 354
 355         return handle;
 356 }
 357
 358 static void ion_handle_kmap_put(struct ion_handle *);
 359
 360 static void ion_handle_destroy(struct kref *kref)
 361 {
 362         struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
 363         struct ion_client *client = handle->client;
 364         struct ion_buffer *buffer = handle->buffer;
 365
 366         mutex_lock(&buffer->lock);
 367         while (handle->kmap_cnt)
 368                 ion_handle_kmap_put(handle);
 369         mutex_unlock(&buffer->lock);
 370
 371         idr_remove(&client->idr, handle->id);
 372         if (!RB_EMPTY_NODE(&handle->node))
 373                 rb_erase(&handle->node, &client->handles);
 374
 375         ion_buffer_remove_from_handle(buffer);
 376         ion_buffer_put(buffer);
 377
 378         kfree(handle);
 379 }
 380
 381 struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
 382 {
 383         return handle->buffer;
 384 }
 385
 386 static void ion_handle_get(struct ion_handle *handle)
 387 {
 388         kref_get(&handle->ref);
 389 }
 390
 391 static int ion_handle_put(struct ion_handle *handle)
 392 {
 393         struct ion_client *client = handle->client;
 394         int ret;
 395
 396         mutex_lock(&client->lock);
 397         ret = kref_put(&handle->ref, ion_handle_destroy);
 398         mutex_unlock(&client->lock);
 399
 400         return ret;
 401 }
 402
 403 static struct ion_handle *ion_handle_lookup(struct ion_client *client,
 404                                             struct ion_buffer *buffer)
 405 {
 406         struct rb_node *n = client->handles.rb_node;
 407
 408         while (n) {
 409                 struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
 410
 411                 if (buffer < entry->buffer)
 412                         n = n->rb_left;
 413                 else if (buffer > entry->buffer)
 414                         n = n->rb_right;
 415                 else
 416                         return entry;
 417         }
 418         return ERR_PTR(-EINVAL);
 419 }
 420
 421 static struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
 422                                                 int id)
 423 {
 424         struct ion_handle *handle;
 425
 426         mutex_lock(&client->lock);
 427         handle = idr_find(&client->idr, id);
 428         if (handle)
 429                 ion_handle_get(handle);
 430         mutex_unlock(&client->lock);
 431
 432         return handle ? handle : ERR_PTR(-EINVAL);
 433 }
 434
 435 static bool ion_handle_validate(struct ion_client *client,
 436                                 struct ion_handle *handle)
 437 {
 438         WARN_ON(!mutex_is_locked(&client->lock));
 439         return (idr_find(&client->idr, handle->id) == handle);
 440 }
 441
 442 static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
 443 {
 444         int id;
 445         struct rb_node **p = &client->handles.rb_node;
 446         struct rb_node *parent = NULL;
 447         struct ion_handle *entry;
 448
 449         id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
 450         if (id < 0)
 451                 return id;
 452
 453         handle->id = id;
 454
 455         while (*p) {
 456                 parent = *p;
 457                 entry = rb_entry(parent, struct ion_handle, node);
 458
 459                 if (handle->buffer < entry->buffer)
 460                         p = &(*p)->rb_left;
 461                 else if (handle->buffer > entry->buffer)
 462                         p = &(*p)->rb_right;
 463                 else
 464                         WARN(1, "%s: buffer already found.", __func__);
 465         }
 466
 467         rb_link_node(&handle->node, parent, p);
 468         rb_insert_color(&handle->node, &client->handles);
 469
 470         return 0;
 471 }
 472
 473 struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
 474                              size_t align, unsigned int heap_id_mask,
 475                              unsigned int flags)
 476 {
 477         struct ion_handle *handle;
 478         struct ion_device *dev = client->dev;
 479         struct ion_buffer *buffer = NULL;
 480         struct ion_heap *heap;
 481         int ret;
 482
 483         pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
 484                  len, align, heap_id_mask, flags);
 485         /*
 486          * traverse the list of heaps available in this system in priority
 487          * order.  If the heap type is supported by the client, and matches the
 488          * request of the caller allocate from it.  Repeat until allocate has
 489          * succeeded or all heaps have been tried
 490          */
 491         len = PAGE_ALIGN(len);
 492
 493         if (!len)
 494                 return ERR_PTR(-EINVAL);
 495
 496         down_read(&dev->lock);
 497         plist_for_each_entry(heap, &dev->heaps, node) {
 498                 /* if the caller didn't specify this heap id */
 499                 if (!((1 << heap->id) & heap_id_mask))
 500                         continue;
 501                 buffer = ion_buffer_create(heap, dev, len, align, flags);
 502                 if (!IS_ERR(buffer))
 503                         break;
 504         }
 505         up_read(&dev->lock);
 506
 507         if (buffer == NULL)
 508                 return ERR_PTR(-ENODEV);
 509
 510         if (IS_ERR(buffer))
 511                 return ERR_PTR(PTR_ERR(buffer));
 512
 513         handle = ion_handle_create(client, buffer);
 514
 515         /*
 516          * ion_buffer_create will create a buffer with a ref_cnt of 1,
 517          * and ion_handle_create will take a second reference, drop one here
 518          */
 519         ion_buffer_put(buffer);
 520
 521         if (IS_ERR(handle))
 522                 return handle;
 523
 524         mutex_lock(&client->lock);
 525         ret = ion_handle_add(client, handle);
 526         mutex_unlock(&client->lock);
 527         if (ret) {
 528                 ion_handle_put(handle);
 529                 handle = ERR_PTR(ret);
 530         }
 531
 532         return handle;
 533 }
 534 EXPORT_SYMBOL(ion_alloc);
 535
 536 void ion_free(struct ion_client *client, struct ion_handle *handle)
 537 {
 538         bool valid_handle;
 539
 540         BUG_ON(client != handle->client);
 541
 542         mutex_lock(&client->lock);
 543         valid_handle = ion_handle_validate(client, handle);
 544
 545         if (!valid_handle) {
 546                 WARN(1, "%s: invalid handle passed to free.\n", __func__);
 547                 mutex_unlock(&client->lock);
 548                 return;
 549         }
 550         mutex_unlock(&client->lock);
 551         ion_handle_put(handle);
 552 }
 553 EXPORT_SYMBOL(ion_free);
 554
 555 int ion_phys(struct ion_client *client, struct ion_handle *handle,
 556              ion_phys_addr_t *addr, size_t *len)
 557 {
 558         struct ion_buffer *buffer;
 559         int ret;
 560
 561         mutex_lock(&client->lock);
 562         if (!ion_handle_validate(client, handle)) {
 563                 mutex_unlock(&client->lock);
 564                 return -EINVAL;
 565         }
 566
 567         buffer = handle->buffer;
 568
 569         if (!buffer->heap->ops->phys) {
 570                 pr_err("%s: ion_phys is not implemented by this heap.\n",
 571                        __func__);
 572                 mutex_unlock(&client->lock);
 573                 return -ENODEV;
 574         }
 575         mutex_unlock(&client->lock);
 576         ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
 577         return ret;
 578 }
 579 EXPORT_SYMBOL(ion_phys);
 580
 581 static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
 582 {
 583         void *vaddr;
 584
 585         if (buffer->kmap_cnt) {
 586                 buffer->kmap_cnt++;
 587                 return buffer->vaddr;
 588         }
 589         vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
 590         if (WARN_ONCE(vaddr == NULL,
 591                         "heap->ops->map_kernel should return ERR_PTR on error"))
 592                 return ERR_PTR(-EINVAL);
 593         if (IS_ERR(vaddr))
 594                 return vaddr;
 595         buffer->vaddr = vaddr;
 596         buffer->kmap_cnt++;
 597         return vaddr;
 598 }
 599
 600 static void *ion_handle_kmap_get(struct ion_handle *handle)
 601 {
 602         struct ion_buffer *buffer = handle->buffer;
 603         void *vaddr;
 604
 605         if (handle->kmap_cnt) {
 606                 handle->kmap_cnt++;
 607                 return buffer->vaddr;
 608         }
 609         vaddr = ion_buffer_kmap_get(buffer);
 610         if (IS_ERR(vaddr))
 611                 return vaddr;
 612         handle->kmap_cnt++;
 613         return vaddr;
 614 }
 615
 616 static void ion_buffer_kmap_put(struct ion_buffer *buffer)
 617 {
 618         buffer->kmap_cnt--;
 619         if (!buffer->kmap_cnt) {
 620                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 621                 buffer->vaddr = NULL;
 622         }
 623 }
 624
 625 static void ion_handle_kmap_put(struct ion_handle *handle)
 626 {
 627         struct ion_buffer *buffer = handle->buffer;
 628
 629         handle->kmap_cnt--;
 630         if (!handle->kmap_cnt)
 631                 ion_buffer_kmap_put(buffer);
 632 }
 633
 634 void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
 635 {
 636         struct ion_buffer *buffer;
 637         void *vaddr;
 638
 639         mutex_lock(&client->lock);
 640         if (!ion_handle_validate(client, handle)) {
 641                 pr_err("%s: invalid handle passed to map_kernel.\n",
 642                        __func__);
 643                 mutex_unlock(&client->lock);
 644                 return ERR_PTR(-EINVAL);
 645         }
 646
 647         buffer = handle->buffer;
 648
 649         if (!handle->buffer->heap->ops->map_kernel) {
 650                 pr_err("%s: map_kernel is not implemented by this heap.\n",
 651                        __func__);
 652                 mutex_unlock(&client->lock);
 653                 return ERR_PTR(-ENODEV);
 654         }
 655
 656         mutex_lock(&buffer->lock);
 657         vaddr = ion_handle_kmap_get(handle);
 658         mutex_unlock(&buffer->lock);
 659         mutex_unlock(&client->lock);
 660         return vaddr;
 661 }
 662 EXPORT_SYMBOL(ion_map_kernel);
 663
 664 void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
 665 {
 666         struct ion_buffer *buffer;
 667
 668         mutex_lock(&client->lock);
 669         buffer = handle->buffer;
 670         mutex_lock(&buffer->lock);
 671         ion_handle_kmap_put(handle);
 672         mutex_unlock(&buffer->lock);
 673         mutex_unlock(&client->lock);
 674 }
 675 EXPORT_SYMBOL(ion_unmap_kernel);
 676
 677 static int ion_debug_client_show(struct seq_file *s, void *unused)
 678 {
 679         struct ion_client *client = s->private;
 680         struct rb_node *n;
 681         size_t sizes[ION_NUM_HEAP_IDS] = {0};
 682         const char *names[ION_NUM_HEAP_IDS] = {NULL};
 683         int i;
 684
 685         mutex_lock(&client->lock);
 686         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
 687                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 688                                                      node);
 689                 unsigned int id = handle->buffer->heap->id;
 690
 691                 if (!names[id])
 692                         names[id] = handle->buffer->heap->name;
 693                 sizes[id] += handle->buffer->size;
 694         }
 695         mutex_unlock(&client->lock);
 696
 697         seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
 698         for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
 699                 if (!names[i])
 700                         continue;
 701                 seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
 702         }
 703         return 0;
 704 }
 705
 706 static int ion_debug_client_open(struct inode *inode, struct file *file)
 707 {
 708         return single_open(file, ion_debug_client_show, inode->i_private);
 709 }
 710
 711 static const struct file_operations debug_client_fops = {
 712         .open = ion_debug_client_open,
 713         .read = seq_read,
 714         .llseek = seq_lseek,
 715         .release = single_release,
 716 };
 717
 718 static int ion_get_client_serial(const struct rb_root *root,
 719                                         const unsigned char *name)
 720 {
 721         int serial = -1;
 722         struct rb_node *node;
 723
 724         for (node = rb_first(root); node; node = rb_next(node)) {
 725                 struct ion_client *client = rb_entry(node, struct ion_client,
 726                                                 node);
 727
 728                 if (strcmp(client->name, name))
 729                         continue;
 730                 serial = max(serial, client->display_serial);
 731         }
 732         return serial + 1;
 733 }
 734
 735 struct ion_client *ion_client_create(struct ion_device *dev,
 736                                      const char *name)
 737 {
 738         struct ion_client *client;
 739         struct task_struct *task;
 740         struct rb_node **p;
 741         struct rb_node *parent = NULL;
 742         struct ion_client *entry;
 743         pid_t pid;
 744
 745         if (!name) {
 746                 pr_err("%s: Name cannot be null\n", __func__);
 747                 return ERR_PTR(-EINVAL);
 748         }
 749
 750         get_task_struct(current->group_leader);
 751         task_lock(current->group_leader);
 752         pid = task_pid_nr(current->group_leader);
 753         /* don't bother to store task struct for kernel threads,
 754            they can't be killed anyway */
 755         if (current->group_leader->flags & PF_KTHREAD) {
 756                 put_task_struct(current->group_leader);
 757                 task = NULL;
 758         } else {
 759                 task = current->group_leader;
 760         }
 761         task_unlock(current->group_leader);
 762
 763         client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
 764         if (!client)
 765                 goto err_put_task_struct;
 766
 767         client->dev = dev;
 768         client->handles = RB_ROOT;
 769         idr_init(&client->idr);
 770         mutex_init(&client->lock);
 771         client->task = task;
 772         client->pid = pid;
 773         client->name = kstrdup(name, GFP_KERNEL);
 774         if (!client->name)
 775                 goto err_free_client;
 776
 777         down_write(&dev->lock);
 778         client->display_serial = ion_get_client_serial(&dev->clients, name);
 779         client->display_name = kasprintf(
 780                 GFP_KERNEL, "%s-%d", name, client->display_serial);
 781         if (!client->display_name) {
 782                 up_write(&dev->lock);
 783                 goto err_free_client_name;
 784         }
 785         p = &dev->clients.rb_node;
 786         while (*p) {
 787                 parent = *p;
 788                 entry = rb_entry(parent, struct ion_client, node);
 789
 790                 if (client < entry)
 791                         p = &(*p)->rb_left;
 792                 else if (client > entry)
 793                         p = &(*p)->rb_right;
 794         }
 795         rb_link_node(&client->node, parent, p);
 796         rb_insert_color(&client->node, &dev->clients);
 797
 798         client->debug_root = debugfs_create_file(client->display_name, 0664,
 799                                                 dev->clients_debug_root,
 800                                                 client, &debug_client_fops);
 801         if (!client->debug_root) {
 802                 char buf[256], *path;
 803                 path = dentry_path(dev->clients_debug_root, buf, 256);
 804                 pr_err("Failed to create client debugfs at %s/%s\n",
 805                         path, client->display_name);
 806         }
 807
 808         up_write(&dev->lock);
 809
 810         return client;
 811
 812 err_free_client_name:
 813         kfree(client->name);
 814 err_free_client:
 815         kfree(client);
 816 err_put_task_struct:
 817         if (task)
 818                 put_task_struct(current->group_leader);
 819         return ERR_PTR(-ENOMEM);
 820 }
 821 EXPORT_SYMBOL(ion_client_create);
 822
 823 void ion_client_destroy(struct ion_client *client)
 824 {
 825         struct ion_device *dev = client->dev;
 826         struct rb_node *n;
 827
 828         pr_debug("%s: %d\n", __func__, __LINE__);
 829         while ((n = rb_first(&client->handles))) {
 830                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 831                                                      node);
 832                 ion_handle_destroy(&handle->ref);
 833         }
 834
 835         idr_destroy(&client->idr);
 836
 837         down_write(&dev->lock);
 838         if (client->task)
 839                 put_task_struct(client->task);
 840         rb_erase(&client->node, &dev->clients);
 841         debugfs_remove_recursive(client->debug_root);
 842         up_write(&dev->lock);
 843
 844         kfree(client->display_name);
 845         kfree(client->name);
 846         kfree(client);
 847 }
 848 EXPORT_SYMBOL(ion_client_destroy);
 849
 850 struct sg_table *ion_sg_table(struct ion_client *client,
 851                               struct ion_handle *handle)
 852 {
 853         struct ion_buffer *buffer;
 854         struct sg_table *table;
 855
 856         mutex_lock(&client->lock);
 857         if (!ion_handle_validate(client, handle)) {
 858                 pr_err("%s: invalid handle passed to map_dma.\n",
 859                        __func__);
 860                 mutex_unlock(&client->lock);
 861                 return ERR_PTR(-EINVAL);
 862         }
 863         buffer = handle->buffer;
 864         table = buffer->sg_table;
 865         mutex_unlock(&client->lock);
 866         return table;
 867 }
 868 EXPORT_SYMBOL(ion_sg_table);
 869
 870 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 871                                        struct device *dev,
 872                                        enum dma_data_direction direction);
 873
 874 static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
 875                                         enum dma_data_direction direction)
 876 {
 877         struct dma_buf *dmabuf = attachment->dmabuf;
 878         struct ion_buffer *buffer = dmabuf->priv;
 879
 880         ion_buffer_sync_for_device(buffer, attachment->dev, direction);
 881         return buffer->sg_table;
 882 }
 883
 884 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
 885                               struct sg_table *table,
 886                               enum dma_data_direction direction)
 887 {
 888 }
 889
 890 void ion_pages_sync_for_device(struct device *dev, struct page *page,
 891                 size_t size, enum dma_data_direction dir)
 892 {
 893         struct scatterlist sg;
 894
 895         sg_init_table(&sg, 1);
 896         sg_set_page(&sg, page, size, 0);
 897         /*
 898          * This is not correct - sg_dma_address needs a dma_addr_t that is valid
 899          * for the the targeted device, but this works on the currently targeted
 900          * hardware.
 901          */
 902         sg_dma_address(&sg) = page_to_phys(page);
 903         dma_sync_sg_for_device(dev, &sg, 1, dir);
 904 }
 905
 906 struct ion_vma_list {
 907         struct list_head list;
 908         struct vm_area_struct *vma;
 909 };
 910
 911 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 912                                        struct device *dev,
 913                                        enum dma_data_direction dir)
 914 {
 915         struct ion_vma_list *vma_list;
 916         int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 917         int i;
 918
 919         pr_debug("%s: syncing for device %s\n", __func__,
 920                  dev ? dev_name(dev) : "null");
 921
 922         if (!ion_buffer_fault_user_mappings(buffer))
 923                 return;
 924
 925         mutex_lock(&buffer->lock);
 926         for (i = 0; i < pages; i++) {
 927                 struct page *page = buffer->pages[i];
 928
 929                 if (ion_buffer_page_is_dirty(page))
 930                         ion_pages_sync_for_device(dev, ion_buffer_page(page),
 931                                                         PAGE_SIZE, dir);
 932
 933                 ion_buffer_page_clean(buffer->pages + i);
 934         }
 935         list_for_each_entry(vma_list, &buffer->vmas, list) {
 936                 struct vm_area_struct *vma = vma_list->vma;
 937
 938                 zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
 939                                NULL);
 940         }
 941         mutex_unlock(&buffer->lock);
 942 }
 943
 944 static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 945 {
 946         struct ion_buffer *buffer = vma->vm_private_data;
 947         unsigned long pfn;
 948         int ret;
 949
 950         mutex_lock(&buffer->lock);
 951         ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
 952         BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
 953
 954         pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
 955         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
 956         mutex_unlock(&buffer->lock);
 957         if (ret)
 958                 return VM_FAULT_ERROR;
 959
 960         return VM_FAULT_NOPAGE;
 961 }
 962
 963 static void ion_vm_open(struct vm_area_struct *vma)
 964 {
 965         struct ion_buffer *buffer = vma->vm_private_data;
 966         struct ion_vma_list *vma_list;
 967
 968         vma_list = kmalloc(sizeof(struct ion_vma_list), GFP_KERNEL);
 969         if (!vma_list)
 970                 return;
 971         vma_list->vma = vma;
 972         mutex_lock(&buffer->lock);
 973         list_add(&vma_list->list, &buffer->vmas);
 974         mutex_unlock(&buffer->lock);
 975         pr_debug("%s: adding %p\n", __func__, vma);
 976 }
 977
 978 static void ion_vm_close(struct vm_area_struct *vma)
 979 {
 980         struct ion_buffer *buffer = vma->vm_private_data;
 981         struct ion_vma_list *vma_list, *tmp;
 982
 983         pr_debug("%s\n", __func__);
 984         mutex_lock(&buffer->lock);
 985         list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
 986                 if (vma_list->vma != vma)
 987                         continue;
 988                 list_del(&vma_list->list);
 989                 kfree(vma_list);
 990                 pr_debug("%s: deleting %p\n", __func__, vma);
 991                 break;
 992         }
 993         mutex_unlock(&buffer->lock);
 994 }
 995
 996 static struct vm_operations_struct ion_vma_ops = {
 997         .open = ion_vm_open,
 998         .close = ion_vm_close,
 999         .fault = ion_vm_fault,
1000 };
1001
1002 static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
1003 {
1004         struct ion_buffer *buffer = dmabuf->priv;
1005         int ret = 0;
1006
1007         if (!buffer->heap->ops->map_user) {
1008                 pr_err("%s: this heap does not define a method for mapping "
1009                        "to userspace\n", __func__);
1010                 return -EINVAL;
1011         }
1012
1013         if (ion_buffer_fault_user_mappings(buffer)) {
1014                 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
1015                                                         VM_DONTDUMP;
1016                 vma->vm_private_data = buffer;
1017                 vma->vm_ops = &ion_vma_ops;
1018                 ion_vm_open(vma);
1019                 return 0;
1020         }
1021
1022         if (!(buffer->flags & ION_FLAG_CACHED))
1023                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1024
1025         mutex_lock(&buffer->lock);
1026         /* now map it to userspace */
1027         ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
1028         mutex_unlock(&buffer->lock);
1029
1030         if (ret)
1031                 pr_err("%s: failure mapping buffer to userspace\n",
1032                        __func__);
1033
1034         return ret;
1035 }
1036
1037 static void ion_dma_buf_release(struct dma_buf *dmabuf)
1038 {
1039         struct ion_buffer *buffer = dmabuf->priv;
1040
1041         ion_buffer_put(buffer);
1042 }
1043
1044 static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
1045 {
1046         struct ion_buffer *buffer = dmabuf->priv;
1047
1048         return buffer->vaddr + offset * PAGE_SIZE;
1049 }
1050
1051 static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
1052                                void *ptr)
1053 {
1054         return;
1055 }
1056
1057 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
1058                                         size_t len,
1059                                         enum dma_data_direction direction)
1060 {
1061         struct ion_buffer *buffer = dmabuf->priv;
1062         void *vaddr;
1063
1064         if (!buffer->heap->ops->map_kernel) {
1065                 pr_err("%s: map kernel is not implemented by this heap.\n",
1066                        __func__);
1067                 return -ENODEV;
1068         }
1069
1070         mutex_lock(&buffer->lock);
1071         vaddr = ion_buffer_kmap_get(buffer);
1072         mutex_unlock(&buffer->lock);
1073         if (IS_ERR(vaddr))
1074                 return PTR_ERR(vaddr);
1075         return 0;
1076 }
1077
1078 static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
1079                                        size_t len,
1080                                        enum dma_data_direction direction)
1081 {
1082         struct ion_buffer *buffer = dmabuf->priv;
1083
1084         mutex_lock(&buffer->lock);
1085         ion_buffer_kmap_put(buffer);
1086         mutex_unlock(&buffer->lock);
1087 }
1088
1089 static struct dma_buf_ops dma_buf_ops = {
1090         .map_dma_buf = ion_map_dma_buf,
1091         .unmap_dma_buf = ion_unmap_dma_buf,
1092         .mmap = ion_mmap,
1093         .release = ion_dma_buf_release,
1094         .begin_cpu_access = ion_dma_buf_begin_cpu_access,
1095         .end_cpu_access = ion_dma_buf_end_cpu_access,
1096         .kmap_atomic = ion_dma_buf_kmap,
1097         .kunmap_atomic = ion_dma_buf_kunmap,
1098         .kmap = ion_dma_buf_kmap,
1099         .kunmap = ion_dma_buf_kunmap,
1100 };
1101
1102 struct dma_buf *ion_share_dma_buf(struct ion_client *client,
1103                                                 struct ion_handle *handle)
1104 {
1105         struct ion_buffer *buffer;
1106         struct dma_buf *dmabuf;
1107         bool valid_handle;
1108
1109         mutex_lock(&client->lock);
1110         valid_handle = ion_handle_validate(client, handle);
1111         if (!valid_handle) {
1112                 WARN(1, "%s: invalid handle passed to share.\n", __func__);
1113                 mutex_unlock(&client->lock);
1114                 return ERR_PTR(-EINVAL);
1115         }
1116         buffer = handle->buffer;
1117         ion_buffer_get(buffer);
1118         mutex_unlock(&client->lock);
1119
1120         dmabuf = dma_buf_export(buffer, &dma_buf_ops, buffer->size, O_RDWR);
1121         if (IS_ERR(dmabuf)) {
1122                 ion_buffer_put(buffer);
1123                 return dmabuf;
1124         }
1125
1126         return dmabuf;
1127 }
1128 EXPORT_SYMBOL(ion_share_dma_buf);
1129
1130 int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
1131 {
1132         struct dma_buf *dmabuf;
1133         int fd;
1134
1135         dmabuf = ion_share_dma_buf(client, handle);
1136         if (IS_ERR(dmabuf))
1137                 return PTR_ERR(dmabuf);
1138
1139         fd = dma_buf_fd(dmabuf, O_CLOEXEC);
1140         if (fd < 0)
1141                 dma_buf_put(dmabuf);
1142
1143         return fd;
1144 }
1145 EXPORT_SYMBOL(ion_share_dma_buf_fd);
1146
1147 struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
1148 {
1149         struct dma_buf *dmabuf;
1150         struct ion_buffer *buffer;
1151         struct ion_handle *handle;
1152         int ret;
1153
1154         dmabuf = dma_buf_get(fd);
1155         if (IS_ERR(dmabuf))
1156                 return ERR_PTR(PTR_ERR(dmabuf));
1157         /* if this memory came from ion */
1158
1159         if (dmabuf->ops != &dma_buf_ops) {
1160                 pr_err("%s: can not import dmabuf from another exporter\n",
1161                        __func__);
1162                 dma_buf_put(dmabuf);
1163                 return ERR_PTR(-EINVAL);
1164         }
1165         buffer = dmabuf->priv;
1166
1167         mutex_lock(&client->lock);
1168         /* if a handle exists for this buffer just take a reference to it */
1169         handle = ion_handle_lookup(client, buffer);
1170         if (!IS_ERR(handle)) {
1171                 ion_handle_get(handle);
1172                 mutex_unlock(&client->lock);
1173                 goto end;
1174         }
1175         mutex_unlock(&client->lock);
1176
1177         handle = ion_handle_create(client, buffer);
1178         if (IS_ERR(handle))
1179                 goto end;
1180
1181         mutex_lock(&client->lock);
1182         ret = ion_handle_add(client, handle);
1183         mutex_unlock(&client->lock);
1184         if (ret) {
1185                 ion_handle_put(handle);
1186                 handle = ERR_PTR(ret);
1187         }
1188
1189 end:
1190         dma_buf_put(dmabuf);
1191         return handle;
1192 }
1193 EXPORT_SYMBOL(ion_import_dma_buf);
1194
1195 static int ion_sync_for_device(struct ion_client *client, int fd)
1196 {
1197         struct dma_buf *dmabuf;
1198         struct ion_buffer *buffer;
1199
1200         dmabuf = dma_buf_get(fd);
1201         if (IS_ERR(dmabuf))
1202                 return PTR_ERR(dmabuf);
1203
1204         /* if this memory came from ion */
1205         if (dmabuf->ops != &dma_buf_ops) {
1206                 pr_err("%s: can not sync dmabuf from another exporter\n",
1207                        __func__);
1208                 dma_buf_put(dmabuf);
1209                 return -EINVAL;
1210         }
1211         buffer = dmabuf->priv;
1212
1213         dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
1214                                buffer->sg_table->nents, DMA_BIDIRECTIONAL);
1215         dma_buf_put(dmabuf);
1216         return 0;
1217 }
1218
1219 /* fix up the cases where the ioctl direction bits are incorrect */
1220 static unsigned int ion_ioctl_dir(unsigned int cmd)
1221 {
1222         switch (cmd) {
1223         case ION_IOC_SYNC:
1224         case ION_IOC_FREE:
1225         case ION_IOC_CUSTOM:
1226                 return _IOC_WRITE;
1227         default:
1228                 return _IOC_DIR(cmd);
1229         }
1230 }
1231
1232 static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1233 {
1234         struct ion_client *client = filp->private_data;
1235         struct ion_device *dev = client->dev;
1236         struct ion_handle *cleanup_handle = NULL;
1237         int ret = 0;
1238         unsigned int dir;
1239
1240         union {
1241                 struct ion_fd_data fd;
1242                 struct ion_allocation_data allocation;
1243                 struct ion_handle_data handle;
1244                 struct ion_custom_data custom;
1245         } data;
1246
1247         dir = ion_ioctl_dir(cmd);
1248
1249         if (_IOC_SIZE(cmd) > sizeof(data))
1250                 return -EINVAL;
1251
1252         if (dir & _IOC_WRITE)
1253                 if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
1254                         return -EFAULT;
1255
1256         switch (cmd) {
1257         case ION_IOC_ALLOC:
1258         {
1259                 struct ion_handle *handle;
1260
1261                 handle = ion_alloc(client, data.allocation.len,
1262                                                 data.allocation.align,
1263                                                 data.allocation.heap_id_mask,
1264                                                 data.allocation.flags);
1265                 if (IS_ERR(handle))
1266                         return PTR_ERR(handle);
1267
1268                 data.allocation.handle = handle->id;
1269
1270                 cleanup_handle = handle;
1271                 break;
1272         }
1273         case ION_IOC_FREE:
1274         {
1275                 struct ion_handle *handle;
1276
1277                 handle = ion_handle_get_by_id(client, data.handle.handle);
1278                 if (IS_ERR(handle))
1279                         return PTR_ERR(handle);
1280                 ion_free(client, handle);
1281                 ion_handle_put(handle);
1282                 break;
1283         }
1284         case ION_IOC_SHARE:
1285         case ION_IOC_MAP:
1286         {
1287                 struct ion_handle *handle;
1288
1289                 handle = ion_handle_get_by_id(client, data.handle.handle);
1290                 if (IS_ERR(handle))
1291                         return PTR_ERR(handle);
1292                 data.fd.fd = ion_share_dma_buf_fd(client, handle);
1293                 ion_handle_put(handle);
1294                 if (data.fd.fd < 0)
1295                         ret = data.fd.fd;
1296                 break;
1297         }
1298         case ION_IOC_IMPORT:
1299         {
1300                 struct ion_handle *handle;
1301
1302                 handle = ion_import_dma_buf(client, data.fd.fd);
1303                 if (IS_ERR(handle))
1304                         ret = PTR_ERR(handle);
1305                 else
1306                         data.handle.handle = handle->id;
1307                 break;
1308         }
1309         case ION_IOC_SYNC:
1310         {
1311                 ret = ion_sync_for_device(client, data.fd.fd);
1312                 break;
1313         }
1314         case ION_IOC_CUSTOM:
1315         {
1316                 if (!dev->custom_ioctl)
1317                         return -ENOTTY;
1318                 ret = dev->custom_ioctl(client, data.custom.cmd,
1319                                                 data.custom.arg);
1320                 break;
1321         }
1322         default:
1323                 return -ENOTTY;
1324         }
1325
1326         if (dir & _IOC_READ) {
1327                 if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
1328                         if (cleanup_handle)
1329                                 ion_free(client, cleanup_handle);
1330                         return -EFAULT;
1331                 }
1332         }
1333         return ret;
1334 }
1335
1336 static int ion_release(struct inode *inode, struct file *file)
1337 {
1338         struct ion_client *client = file->private_data;
1339
1340         pr_debug("%s: %d\n", __func__, __LINE__);
1341         ion_client_destroy(client);
1342         return 0;
1343 }
1344
1345 static int ion_open(struct inode *inode, struct file *file)
1346 {
1347         struct miscdevice *miscdev = file->private_data;
1348         struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
1349         struct ion_client *client;
1350         char debug_name[64];
1351
1352         pr_debug("%s: %d\n", __func__, __LINE__);
1353         snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
1354         client = ion_client_create(dev, debug_name);
1355         if (IS_ERR(client))
1356                 return PTR_ERR(client);
1357         file->private_data = client;
1358
1359         return 0;
1360 }
1361
1362 static const struct file_operations ion_fops = {
1363         .owner          = THIS_MODULE,
1364         .open           = ion_open,
1365         .release        = ion_release,
1366         .unlocked_ioctl = ion_ioctl,
1367         .compat_ioctl   = compat_ion_ioctl,
1368 };
1369
1370 static size_t ion_debug_heap_total(struct ion_client *client,
1371                                    unsigned int id)
1372 {
1373         size_t size = 0;
1374         struct rb_node *n;
1375
1376         mutex_lock(&client->lock);
1377         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1378                 struct ion_handle *handle = rb_entry(n,
1379                                                      struct ion_handle,
1380                                                      node);
1381                 if (handle->buffer->heap->id == id)
1382                         size += handle->buffer->size;
1383         }
1384         mutex_unlock(&client->lock);
1385         return size;
1386 }
1387
1388 static int ion_debug_heap_show(struct seq_file *s, void *unused)
1389 {
1390         struct ion_heap *heap = s->private;
1391         struct ion_device *dev = heap->dev;
1392         struct rb_node *n;
1393         size_t total_size = 0;
1394         size_t total_orphaned_size = 0;
1395
1396         seq_printf(s, "%16.s %16.s %16.s\n", "client", "pid", "size");
1397         seq_printf(s, "----------------------------------------------------\n");
1398
1399         for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
1400                 struct ion_client *client = rb_entry(n, struct ion_client,
1401                                                      node);
1402                 size_t size = ion_debug_heap_total(client, heap->id);
1403
1404                 if (!size)
1405                         continue;
1406                 if (client->task) {
1407                         char task_comm[TASK_COMM_LEN];
1408
1409                         get_task_comm(task_comm, client->task);
1410                         seq_printf(s, "%16.s %16u %16zu\n", task_comm,
1411                                    client->pid, size);
1412                 } else {
1413                         seq_printf(s, "%16.s %16u %16zu\n", client->name,
1414                                    client->pid, size);
1415                 }
1416         }
1417         seq_printf(s, "----------------------------------------------------\n");
1418         seq_printf(s, "orphaned allocations (info is from last known client):"
1419                    "\n");
1420         mutex_lock(&dev->buffer_lock);
1421         for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
1422                 struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
1423                                                      node);
1424                 if (buffer->heap->id != heap->id)
1425                         continue;
1426                 total_size += buffer->size;
1427                 if (!buffer->handle_count) {
1428                         seq_printf(s, "%16.s %16u %16zu %d %d\n",
1429                                    buffer->task_comm, buffer->pid,
1430                                    buffer->size, buffer->kmap_cnt,
1431                                    atomic_read(&buffer->ref.refcount));
1432                         total_orphaned_size += buffer->size;
1433                 }
1434         }
1435         mutex_unlock(&dev->buffer_lock);
1436         seq_printf(s, "----------------------------------------------------\n");
1437         seq_printf(s, "%16.s %16zu\n", "total orphaned",
1438                    total_orphaned_size);
1439         seq_printf(s, "%16.s %16zu\n", "total ", total_size);
1440         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1441                 seq_printf(s, "%16.s %16zu\n", "deferred free",
1442                                 heap->free_list_size);
1443         seq_printf(s, "----------------------------------------------------\n");
1444
1445         if (heap->debug_show)
1446                 heap->debug_show(heap, s, unused);
1447
1448         return 0;
1449 }
1450
1451 static int ion_debug_heap_open(struct inode *inode, struct file *file)
1452 {
1453         return single_open(file, ion_debug_heap_show, inode->i_private);
1454 }
1455
1456 static const struct file_operations debug_heap_fops = {
1457         .open = ion_debug_heap_open,
1458         .read = seq_read,
1459         .llseek = seq_lseek,
1460         .release = single_release,
1461 };
1462
1463 #ifdef DEBUG_HEAP_SHRINKER
1464 static int debug_shrink_set(void *data, u64 val)
1465 {
1466         struct ion_heap *heap = data;
1467         struct shrink_control sc;
1468         int objs;
1469
1470         sc.gfp_mask = -1;
1471         sc.nr_to_scan = 0;
1472
1473         if (!val)
1474                 return 0;
1475
1476         objs = heap->shrinker.shrink(&heap->shrinker, &sc);
1477         sc.nr_to_scan = objs;
1478
1479         heap->shrinker.shrink(&heap->shrinker, &sc);
1480         return 0;
1481 }
1482
1483 static int debug_shrink_get(void *data, u64 *val)
1484 {
1485         struct ion_heap *heap = data;
1486         struct shrink_control sc;
1487         int objs;
1488
1489         sc.gfp_mask = -1;
1490         sc.nr_to_scan = 0;
1491
1492         objs = heap->shrinker.shrink(&heap->shrinker, &sc);
1493         *val = objs;
1494         return 0;
1495 }
1496
1497 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
1498                         debug_shrink_set, "%llu\n");
1499 #endif
1500
1501 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
1502 {
1503         struct dentry *debug_file;
1504
1505         if (!heap->ops->allocate || !heap->ops->free || !heap->ops->map_dma ||
1506             !heap->ops->unmap_dma)
1507                 pr_err("%s: can not add heap with invalid ops struct.\n",
1508                        __func__);
1509
1510         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1511                 ion_heap_init_deferred_free(heap);
1512
1513         if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
1514                 ion_heap_init_shrinker(heap);
1515
1516         heap->dev = dev;
1517         down_write(&dev->lock);
1518         /* use negative heap->id to reverse the priority -- when traversing
1519            the list later attempt higher id numbers first */
1520         plist_node_init(&heap->node, -heap->id);
1521         plist_add(&heap->node, &dev->heaps);
1522         debug_file = debugfs_create_file(heap->name, 0664,
1523                                         dev->heaps_debug_root, heap,
1524                                         &debug_heap_fops);
1525
1526         if (!debug_file) {
1527                 char buf[256], *path;
1528
1529                 path = dentry_path(dev->heaps_debug_root, buf, 256);
1530                 pr_err("Failed to create heap debugfs at %s/%s\n",
1531                         path, heap->name);
1532         }
1533
1534 #ifdef DEBUG_HEAP_SHRINKER
1535         if (heap->shrinker.shrink) {
1536                 char debug_name[64];
1537
1538                 snprintf(debug_name, 64, "%s_shrink", heap->name);
1539                 debug_file = debugfs_create_file(
1540                         debug_name, 0644, dev->heaps_debug_root, heap,
1541                         &debug_shrink_fops);
1542                 if (!debug_file) {
1543                         char buf[256], *path;
1544
1545                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1546                         pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
1547                                 path, debug_name);
1548                 }
1549         }
1550 #endif
1551         up_write(&dev->lock);
1552 }
1553
1554 struct ion_device *ion_device_create(long (*custom_ioctl)
1555                                      (struct ion_client *client,
1556                                       unsigned int cmd,
1557                                       unsigned long arg))
1558 {
1559         struct ion_device *idev;
1560         int ret;
1561
1562         idev = kzalloc(sizeof(struct ion_device), GFP_KERNEL);
1563         if (!idev)
1564                 return ERR_PTR(-ENOMEM);
1565
1566         idev->dev.minor = MISC_DYNAMIC_MINOR;
1567         idev->dev.name = "ion";
1568         idev->dev.fops = &ion_fops;
1569         idev->dev.parent = NULL;
1570         ret = misc_register(&idev->dev);
1571         if (ret) {
1572                 pr_err("ion: failed to register misc device.\n");
1573                 return ERR_PTR(ret);
1574         }
1575
1576         idev->debug_root = debugfs_create_dir("ion", NULL);
1577         if (!idev->debug_root) {
1578                 pr_err("ion: failed to create debugfs root directory.\n");
1579                 goto debugfs_done;
1580         }
1581         idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
1582         if (!idev->heaps_debug_root) {
1583                 pr_err("ion: failed to create debugfs heaps directory.\n");
1584                 goto debugfs_done;
1585         }
1586         idev->clients_debug_root = debugfs_create_dir("clients",
1587                                                 idev->debug_root);
1588         if (!idev->clients_debug_root)
1589                 pr_err("ion: failed to create debugfs clients directory.\n");
1590
1591 debugfs_done:
1592
1593         idev->custom_ioctl = custom_ioctl;
1594         idev->buffers = RB_ROOT;
1595         mutex_init(&idev->buffer_lock);
1596         init_rwsem(&idev->lock);
1597         plist_head_init(&idev->heaps);
1598         idev->clients = RB_ROOT;
1599         return idev;
1600 }
1601
1602 void ion_device_destroy(struct ion_device *dev)
1603 {
1604         misc_deregister(&dev->dev);
1605         debugfs_remove_recursive(dev->debug_root);
1606         /* XXX need to free the heaps and clients ? */
1607         kfree(dev);
1608 }
1609
1610 void __init ion_reserve(struct ion_platform_data *data)
1611 {
1612         int i;
1613
1614         for (i = 0; i < data->nr; i++) {
1615                 if (data->heaps[i].size == 0)
1616                         continue;
1617
1618                 if (data->heaps[i].base == 0) {
1619                         phys_addr_t paddr;
1620
1621                         paddr = memblock_alloc_base(data->heaps[i].size,
1622                                                     data->heaps[i].align,
1623                                                     MEMBLOCK_ALLOC_ANYWHERE);
1624                         if (!paddr) {
1625                                 pr_err("%s: error allocating memblock for "
1626                                        "heap %d\n",
1627                                         __func__, i);
1628                                 continue;
1629                         }
1630                         data->heaps[i].base = paddr;
1631                 } else {
1632                         int ret = memblock_reserve(data->heaps[i].base,
1633                                                data->heaps[i].size);
1634                         if (ret)
1635                                 pr_err("memblock reserve of %zx@%lx failed\n",
1636                                        data->heaps[i].size,
1637                                        data->heaps[i].base);
1638                 }
1639                 pr_info("%s: %s reserved base %lx size %zu\n", __func__,
1640                         data->heaps[i].name,
1641                         data->heaps[i].base,
1642                         data->heaps[i].size);
1643         }
1644 }