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 /**
  45  * struct ion_device - the metadata of the ion device node
  46  * @dev:                the actual misc device
  47  * @buffers:            an rb tree of all the existing buffers
  48  * @buffer_lock:        lock protecting the tree of buffers
  49  * @lock:               rwsem protecting the tree of heaps and clients
  50  * @heaps:              list of all the heaps in the system
  51  * @user_clients:       list of all the clients created from userspace
  52  */
  53 struct ion_device {
  54         struct miscdevice dev;
  55         struct rb_root buffers;
  56         struct mutex buffer_lock;
  57         struct rw_semaphore lock;
  58         struct plist_head heaps;
  59         long (*custom_ioctl)(struct ion_client *client, unsigned int cmd,
  60                              unsigned long arg);
  61         struct rb_root clients;
  62         struct dentry *debug_root;
  63         struct dentry *heaps_debug_root;
  64         struct dentry *clients_debug_root;
  65 };
  66
  67 /**
  68  * struct ion_client - a process/hw block local address space
  69  * @node:               node in the tree of all clients
  70  * @dev:                backpointer to ion device
  71  * @handles:            an rb tree of all the handles in this client
  72  * @idr:                an idr space for allocating handle ids
  73  * @lock:               lock protecting the tree of handles
  74  * @name:               used for debugging
  75  * @display_name:       used for debugging (unique version of @name)
  76  * @display_serial:     used for debugging (to make display_name unique)
  77  * @task:               used for debugging
  78  *
  79  * A client represents a list of buffers this client may access.
  80  * The mutex stored here is used to protect both handles tree
  81  * as well as the handles themselves, and should be held while modifying either.
  82  */
  83 struct ion_client {
  84         struct rb_node node;
  85         struct ion_device *dev;
  86         struct rb_root handles;
  87         struct idr idr;
  88         struct mutex lock;
  89         const char *name;
  90         char *display_name;
  91         int display_serial;
  92         struct task_struct *task;
  93         pid_t pid;
  94         struct dentry *debug_root;
  95 };
  96
  97 /**
  98  * ion_handle - a client local reference to a buffer
  99  * @ref:                reference count
 100  * @client:             back pointer to the client the buffer resides in
 101  * @buffer:             pointer to the buffer
 102  * @node:               node in the client's handle rbtree
 103  * @kmap_cnt:           count of times this client has mapped to kernel
 104  * @id:                 client-unique id allocated by client->idr
 105  *
 106  * Modifications to node, map_cnt or mapping should be protected by the
 107  * lock in the client.  Other fields are never changed after initialization.
 108  */
 109 struct ion_handle {
 110         struct kref ref;
 111         struct ion_client *client;
 112         struct ion_buffer *buffer;
 113         struct rb_node node;
 114         unsigned int kmap_cnt;
 115         int id;
 116 };
 117
 118 bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
 119 {
 120         return (buffer->flags & ION_FLAG_CACHED) &&
 121                 !(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
 122 }
 123
 124 bool ion_buffer_cached(struct ion_buffer *buffer)
 125 {
 126         return !!(buffer->flags & ION_FLAG_CACHED);
 127 }
 128
 129 static inline struct page *ion_buffer_page(struct page *page)
 130 {
 131         return (struct page *)((unsigned long)page & ~(1UL));
 132 }
 133
 134 static inline bool ion_buffer_page_is_dirty(struct page *page)
 135 {
 136         return !!((unsigned long)page & 1UL);
 137 }
 138
 139 static inline void ion_buffer_page_dirty(struct page **page)
 140 {
 141         *page = (struct page *)((unsigned long)(*page) | 1UL);
 142 }
 143
 144 static inline void ion_buffer_page_clean(struct page **page)
 145 {
 146         *page = (struct page *)((unsigned long)(*page) & ~(1UL));
 147 }
 148
 149 /* this function should only be called while dev->lock is held */
 150 static void ion_buffer_add(struct ion_device *dev,
 151                            struct ion_buffer *buffer)
 152 {
 153         struct rb_node **p = &dev->buffers.rb_node;
 154         struct rb_node *parent = NULL;
 155         struct ion_buffer *entry;
 156
 157         while (*p) {
 158                 parent = *p;
 159                 entry = rb_entry(parent, struct ion_buffer, node);
 160
 161                 if (buffer < entry) {
 162                         p = &(*p)->rb_left;
 163                 } else if (buffer > entry) {
 164                         p = &(*p)->rb_right;
 165                 } else {
 166                         pr_err("%s: buffer already found.", __func__);
 167                         BUG();
 168                 }
 169         }
 170
 171         rb_link_node(&buffer->node, parent, p);
 172         rb_insert_color(&buffer->node, &dev->buffers);
 173 }
 174
 175 /* this function should only be called while dev->lock is held */
 176 static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 177                                      struct ion_device *dev,
 178                                      unsigned long len,
 179                                      unsigned long align,
 180                                      unsigned long flags)
 181 {
 182         struct ion_buffer *buffer;
 183         struct sg_table *table;
 184         struct scatterlist *sg;
 185         int i, ret;
 186
 187         buffer = kzalloc(sizeof(struct ion_buffer), GFP_KERNEL);
 188         if (!buffer)
 189                 return ERR_PTR(-ENOMEM);
 190
 191         buffer->heap = heap;
 192         buffer->flags = flags;
 193         kref_init(&buffer->ref);
 194
 195         ret = heap->ops->allocate(heap, buffer, len, align, flags);
 196
 197         if (ret) {
 198                 if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
 199                         goto err2;
 200
 201                 ion_heap_freelist_drain(heap, 0);
 202                 ret = heap->ops->allocate(heap, buffer, len, align,
 203                                           flags);
 204                 if (ret)
 205                         goto err2;
 206         }
 207
 208         buffer->dev = dev;
 209         buffer->size = len;
 210
 211         table = heap->ops->map_dma(heap, buffer);
 212         if (WARN_ONCE(table == NULL,
 213                         "heap->ops->map_dma should return ERR_PTR on error"))
 214                 table = ERR_PTR(-EINVAL);
 215         if (IS_ERR(table)) {
 216                 ret = -EINVAL;
 217                 goto err1;
 218         }
 219
 220         buffer->sg_table = table;
 221         if (ion_buffer_fault_user_mappings(buffer)) {
 222                 int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 223                 struct scatterlist *sg;
 224                 int i, j, k = 0;
 225
 226                 buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
 227                 if (!buffer->pages) {
 228                         ret = -ENOMEM;
 229                         goto err;
 230                 }
 231
 232                 for_each_sg(table->sgl, sg, table->nents, i) {
 233                         struct page *page = sg_page(sg);
 234
 235                         for (j = 0; j < sg->length / PAGE_SIZE; j++)
 236                                 buffer->pages[k++] = page++;
 237                 }
 238         }
 239
 240         buffer->dev = dev;
 241         buffer->size = len;
 242         INIT_LIST_HEAD(&buffer->vmas);
 243         mutex_init(&buffer->lock);
 244         /*
 245          * this will set up dma addresses for the sglist -- it is not
 246          * technically correct as per the dma api -- a specific
 247          * device isn't really taking ownership here.  However, in practice on
 248          * our systems the only dma_address space is physical addresses.
 249          * Additionally, we can't afford the overhead of invalidating every
 250          * allocation via dma_map_sg. The implicit contract here is that
 251          * memory coming from the heaps is ready for dma, ie if it has a
 252          * cached mapping that mapping has been invalidated
 253          */
 254         for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i) {
 255                 sg_dma_address(sg) = sg_phys(sg);
 256                 sg_dma_len(sg) = sg->length;
 257         }
 258         mutex_lock(&dev->buffer_lock);
 259         ion_buffer_add(dev, buffer);
 260         mutex_unlock(&dev->buffer_lock);
 261         return buffer;
 262
 263 err:
 264         heap->ops->unmap_dma(heap, buffer);
 265 err1:
 266         heap->ops->free(buffer);
 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         vfree(buffer->pages);
 279         kfree(buffer);
 280 }
 281
 282 static void _ion_buffer_destroy(struct kref *kref)
 283 {
 284         struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
 285         struct ion_heap *heap = buffer->heap;
 286         struct ion_device *dev = buffer->dev;
 287
 288         mutex_lock(&dev->buffer_lock);
 289         rb_erase(&buffer->node, &dev->buffers);
 290         mutex_unlock(&dev->buffer_lock);
 291
 292         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
 293                 ion_heap_freelist_add(heap, buffer);
 294         else
 295                 ion_buffer_destroy(buffer);
 296 }
 297
 298 static void ion_buffer_get(struct ion_buffer *buffer)
 299 {
 300         kref_get(&buffer->ref);
 301 }
 302
 303 static int ion_buffer_put(struct ion_buffer *buffer)
 304 {
 305         return kref_put(&buffer->ref, _ion_buffer_destroy);
 306 }
 307
 308 static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
 309 {
 310         mutex_lock(&buffer->lock);
 311         buffer->handle_count++;
 312         mutex_unlock(&buffer->lock);
 313 }
 314
 315 static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
 316 {
 317         /*
 318          * when a buffer is removed from a handle, if it is not in
 319          * any other handles, copy the taskcomm and the pid of the
 320          * process it's being removed from into the buffer.  At this
 321          * point there will be no way to track what processes this buffer is
 322          * being used by, it only exists as a dma_buf file descriptor.
 323          * The taskcomm and pid can provide a debug hint as to where this fd
 324          * is in the system
 325          */
 326         mutex_lock(&buffer->lock);
 327         buffer->handle_count--;
 328         BUG_ON(buffer->handle_count < 0);
 329         if (!buffer->handle_count) {
 330                 struct task_struct *task;
 331
 332                 task = current->group_leader;
 333                 get_task_comm(buffer->task_comm, task);
 334                 buffer->pid = task_pid_nr(task);
 335         }
 336         mutex_unlock(&buffer->lock);
 337 }
 338
 339 static struct ion_handle *ion_handle_create(struct ion_client *client,
 340                                      struct ion_buffer *buffer)
 341 {
 342         struct ion_handle *handle;
 343
 344         handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
 345         if (!handle)
 346                 return ERR_PTR(-ENOMEM);
 347         kref_init(&handle->ref);
 348         RB_CLEAR_NODE(&handle->node);
 349         handle->client = client;
 350         ion_buffer_get(buffer);
 351         ion_buffer_add_to_handle(buffer);
 352         handle->buffer = buffer;
 353
 354         return handle;
 355 }
 356
 357 static void ion_handle_kmap_put(struct ion_handle *);
 358
 359 static void ion_handle_destroy(struct kref *kref)
 360 {
 361         struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
 362         struct ion_client *client = handle->client;
 363         struct ion_buffer *buffer = handle->buffer;
 364
 365         mutex_lock(&buffer->lock);
 366         while (handle->kmap_cnt)
 367                 ion_handle_kmap_put(handle);
 368         mutex_unlock(&buffer->lock);
 369
 370         idr_remove(&client->idr, handle->id);
 371         if (!RB_EMPTY_NODE(&handle->node))
 372                 rb_erase(&handle->node, &client->handles);
 373
 374         ion_buffer_remove_from_handle(buffer);
 375         ion_buffer_put(buffer);
 376
 377         kfree(handle);
 378 }
 379
 380 struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
 381 {
 382         return handle->buffer;
 383 }
 384
 385 static void ion_handle_get(struct ion_handle *handle)
 386 {
 387         kref_get(&handle->ref);
 388 }
 389
 390 static int ion_handle_put(struct ion_handle *handle)
 391 {
 392         struct ion_client *client = handle->client;
 393         int ret;
 394
 395         mutex_lock(&client->lock);
 396         ret = kref_put(&handle->ref, ion_handle_destroy);
 397         mutex_unlock(&client->lock);
 398
 399         return ret;
 400 }
 401
 402 static struct ion_handle *ion_handle_lookup(struct ion_client *client,
 403                                             struct ion_buffer *buffer)
 404 {
 405         struct rb_node *n = client->handles.rb_node;
 406
 407         while (n) {
 408                 struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
 409
 410                 if (buffer < entry->buffer)
 411                         n = n->rb_left;
 412                 else if (buffer > entry->buffer)
 413                         n = n->rb_right;
 414                 else
 415                         return entry;
 416         }
 417         return ERR_PTR(-EINVAL);
 418 }
 419
 420 static struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
 421                                                 int id)
 422 {
 423         struct ion_handle *handle;
 424
 425         mutex_lock(&client->lock);
 426         handle = idr_find(&client->idr, id);
 427         if (handle)
 428                 ion_handle_get(handle);
 429         mutex_unlock(&client->lock);
 430
 431         return handle ? handle : ERR_PTR(-EINVAL);
 432 }
 433
 434 static bool ion_handle_validate(struct ion_client *client,
 435                                 struct ion_handle *handle)
 436 {
 437         WARN_ON(!mutex_is_locked(&client->lock));
 438         return idr_find(&client->idr, handle->id) == handle;
 439 }
 440
 441 static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
 442 {
 443         int id;
 444         struct rb_node **p = &client->handles.rb_node;
 445         struct rb_node *parent = NULL;
 446         struct ion_handle *entry;
 447
 448         id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
 449         if (id < 0)
 450                 return id;
 451
 452         handle->id = id;
 453
 454         while (*p) {
 455                 parent = *p;
 456                 entry = rb_entry(parent, struct ion_handle, node);
 457
 458                 if (handle->buffer < entry->buffer)
 459                         p = &(*p)->rb_left;
 460                 else if (handle->buffer > entry->buffer)
 461                         p = &(*p)->rb_right;
 462                 else
 463                         WARN(1, "%s: buffer already found.", __func__);
 464         }
 465
 466         rb_link_node(&handle->node, parent, p);
 467         rb_insert_color(&handle->node, &client->handles);
 468
 469         return 0;
 470 }
 471
 472 struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
 473                              size_t align, unsigned int heap_id_mask,
 474                              unsigned int flags)
 475 {
 476         struct ion_handle *handle;
 477         struct ion_device *dev = client->dev;
 478         struct ion_buffer *buffer = NULL;
 479         struct ion_heap *heap;
 480         int ret;
 481
 482         pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
 483                  len, align, heap_id_mask, flags);
 484         /*
 485          * traverse the list of heaps available in this system in priority
 486          * order.  If the heap type is supported by the client, and matches the
 487          * request of the caller allocate from it.  Repeat until allocate has
 488          * succeeded or all heaps have been tried
 489          */
 490         len = PAGE_ALIGN(len);
 491
 492         if (!len)
 493                 return ERR_PTR(-EINVAL);
 494
 495         down_read(&dev->lock);
 496         plist_for_each_entry(heap, &dev->heaps, node) {
 497                 /* if the caller didn't specify this heap id */
 498                 if (!((1 << heap->id) & heap_id_mask))
 499                         continue;
 500                 buffer = ion_buffer_create(heap, dev, len, align, flags);
 501                 if (!IS_ERR(buffer))
 502                         break;
 503         }
 504         up_read(&dev->lock);
 505
 506         if (buffer == NULL)
 507                 return ERR_PTR(-ENODEV);
 508
 509         if (IS_ERR(buffer))
 510                 return ERR_CAST(buffer);
 511
 512         handle = ion_handle_create(client, buffer);
 513
 514         /*
 515          * ion_buffer_create will create a buffer with a ref_cnt of 1,
 516          * and ion_handle_create will take a second reference, drop one here
 517          */
 518         ion_buffer_put(buffer);
 519
 520         if (IS_ERR(handle))
 521                 return handle;
 522
 523         mutex_lock(&client->lock);
 524         ret = ion_handle_add(client, handle);
 525         mutex_unlock(&client->lock);
 526         if (ret) {
 527                 ion_handle_put(handle);
 528                 handle = ERR_PTR(ret);
 529         }
 530
 531         return handle;
 532 }
 533 EXPORT_SYMBOL(ion_alloc);
 534
 535 void ion_free(struct ion_client *client, struct ion_handle *handle)
 536 {
 537         bool valid_handle;
 538
 539         BUG_ON(client != handle->client);
 540
 541         mutex_lock(&client->lock);
 542         valid_handle = ion_handle_validate(client, handle);
 543
 544         if (!valid_handle) {
 545                 WARN(1, "%s: invalid handle passed to free.\n", __func__);
 546                 mutex_unlock(&client->lock);
 547                 return;
 548         }
 549         mutex_unlock(&client->lock);
 550         ion_handle_put(handle);
 551 }
 552 EXPORT_SYMBOL(ion_free);
 553
 554 int ion_phys(struct ion_client *client, struct ion_handle *handle,
 555              ion_phys_addr_t *addr, size_t *len)
 556 {
 557         struct ion_buffer *buffer;
 558         int ret;
 559
 560         mutex_lock(&client->lock);
 561         if (!ion_handle_validate(client, handle)) {
 562                 mutex_unlock(&client->lock);
 563                 return -EINVAL;
 564         }
 565
 566         buffer = handle->buffer;
 567
 568         if (!buffer->heap->ops->phys) {
 569                 pr_err("%s: ion_phys is not implemented by this heap (name=%s, type=%d).\n",
 570                         __func__, buffer->heap->name, buffer->heap->type);
 571                 mutex_unlock(&client->lock);
 572                 return -ENODEV;
 573         }
 574         mutex_unlock(&client->lock);
 575         ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
 576         return ret;
 577 }
 578 EXPORT_SYMBOL(ion_phys);
 579
 580 static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
 581 {
 582         void *vaddr;
 583
 584         if (buffer->kmap_cnt) {
 585                 buffer->kmap_cnt++;
 586                 return buffer->vaddr;
 587         }
 588         vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
 589         if (WARN_ONCE(vaddr == NULL,
 590                         "heap->ops->map_kernel should return ERR_PTR on error"))
 591                 return ERR_PTR(-EINVAL);
 592         if (IS_ERR(vaddr))
 593                 return vaddr;
 594         buffer->vaddr = vaddr;
 595         buffer->kmap_cnt++;
 596         return vaddr;
 597 }
 598
 599 static void *ion_handle_kmap_get(struct ion_handle *handle)
 600 {
 601         struct ion_buffer *buffer = handle->buffer;
 602         void *vaddr;
 603
 604         if (handle->kmap_cnt) {
 605                 handle->kmap_cnt++;
 606                 return buffer->vaddr;
 607         }
 608         vaddr = ion_buffer_kmap_get(buffer);
 609         if (IS_ERR(vaddr))
 610                 return vaddr;
 611         handle->kmap_cnt++;
 612         return vaddr;
 613 }
 614
 615 static void ion_buffer_kmap_put(struct ion_buffer *buffer)
 616 {
 617         buffer->kmap_cnt--;
 618         if (!buffer->kmap_cnt) {
 619                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 620                 buffer->vaddr = NULL;
 621         }
 622 }
 623
 624 static void ion_handle_kmap_put(struct ion_handle *handle)
 625 {
 626         struct ion_buffer *buffer = handle->buffer;
 627
 628         if (!handle->kmap_cnt) {
 629                 WARN(1, "%s: Double unmap detected! bailing...\n", __func__);
 630                 return;
 631         }
 632         handle->kmap_cnt--;
 633         if (!handle->kmap_cnt)
 634                 ion_buffer_kmap_put(buffer);
 635 }
 636
 637 void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
 638 {
 639         struct ion_buffer *buffer;
 640         void *vaddr;
 641
 642         mutex_lock(&client->lock);
 643         if (!ion_handle_validate(client, handle)) {
 644                 pr_err("%s: invalid handle passed to map_kernel.\n",
 645                        __func__);
 646                 mutex_unlock(&client->lock);
 647                 return ERR_PTR(-EINVAL);
 648         }
 649
 650         buffer = handle->buffer;
 651
 652         if (!handle->buffer->heap->ops->map_kernel) {
 653                 pr_err("%s: map_kernel is not implemented by this heap.\n",
 654                        __func__);
 655                 mutex_unlock(&client->lock);
 656                 return ERR_PTR(-ENODEV);
 657         }
 658
 659         mutex_lock(&buffer->lock);
 660         vaddr = ion_handle_kmap_get(handle);
 661         mutex_unlock(&buffer->lock);
 662         mutex_unlock(&client->lock);
 663         return vaddr;
 664 }
 665 EXPORT_SYMBOL(ion_map_kernel);
 666
 667 void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
 668 {
 669         struct ion_buffer *buffer;
 670
 671         mutex_lock(&client->lock);
 672         buffer = handle->buffer;
 673         mutex_lock(&buffer->lock);
 674         ion_handle_kmap_put(handle);
 675         mutex_unlock(&buffer->lock);
 676         mutex_unlock(&client->lock);
 677 }
 678 EXPORT_SYMBOL(ion_unmap_kernel);
 679
 680 static struct mutex debugfs_mutex;
 681 static struct rb_root *ion_root_client;
 682 static int is_client_alive(struct ion_client *client)
 683 {
 684         struct rb_node *node;
 685         struct ion_client *tmp;
 686         struct ion_device *dev;
 687
 688         node = ion_root_client->rb_node;
 689         dev = container_of(ion_root_client, struct ion_device, clients);
 690
 691         down_read(&dev->lock);
 692         while (node) {
 693                 tmp = rb_entry(node, struct ion_client, node);
 694                 if (client < tmp) {
 695                         node = node->rb_left;
 696                 } else if (client > tmp) {
 697                         node = node->rb_right;
 698                 } else {
 699                         up_read(&dev->lock);
 700                         return 1;
 701                 }
 702         }
 703
 704         up_read(&dev->lock);
 705         return 0;
 706 }
 707
 708 static int ion_debug_client_show(struct seq_file *s, void *unused)
 709 {
 710         struct ion_client *client = s->private;
 711         struct rb_node *n;
 712         size_t sizes[ION_NUM_HEAP_IDS] = {0};
 713         const char *names[ION_NUM_HEAP_IDS] = {NULL};
 714         int i;
 715
 716         mutex_lock(&debugfs_mutex);
 717         if (!is_client_alive(client)) {
 718                 seq_printf(s, "ion_client 0x%p dead, can't dump its buffers\n",
 719                            client);
 720                 mutex_unlock(&debugfs_mutex);
 721                 return 0;
 722         }
 723
 724         mutex_lock(&client->lock);
 725         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
 726                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 727                                                      node);
 728                 unsigned int id = handle->buffer->heap->id;
 729
 730                 if (!names[id])
 731                         names[id] = handle->buffer->heap->name;
 732                 sizes[id] += handle->buffer->size;
 733         }
 734         mutex_unlock(&client->lock);
 735         mutex_unlock(&debugfs_mutex);
 736
 737         seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
 738         for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
 739                 if (!names[i])
 740                         continue;
 741                 seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
 742         }
 743         return 0;
 744 }
 745
 746 static int ion_debug_client_open(struct inode *inode, struct file *file)
 747 {
 748         return single_open(file, ion_debug_client_show, inode->i_private);
 749 }
 750
 751 static const struct file_operations debug_client_fops = {
 752         .open = ion_debug_client_open,
 753         .read = seq_read,
 754         .llseek = seq_lseek,
 755         .release = single_release,
 756 };
 757
 758 static int ion_get_client_serial(const struct rb_root *root,
 759                                         const unsigned char *name)
 760 {
 761         int serial = -1;
 762         struct rb_node *node;
 763
 764         for (node = rb_first(root); node; node = rb_next(node)) {
 765                 struct ion_client *client = rb_entry(node, struct ion_client,
 766                                                 node);
 767
 768                 if (strcmp(client->name, name))
 769                         continue;
 770                 serial = max(serial, client->display_serial);
 771         }
 772         return serial + 1;
 773 }
 774
 775 struct ion_client *ion_client_create(struct ion_device *dev,
 776                                      const char *name)
 777 {
 778         struct ion_client *client;
 779         struct task_struct *task;
 780         struct rb_node **p;
 781         struct rb_node *parent = NULL;
 782         struct ion_client *entry;
 783         pid_t pid;
 784
 785         if (!name) {
 786                 pr_err("%s: Name cannot be null\n", __func__);
 787                 return ERR_PTR(-EINVAL);
 788         }
 789
 790         get_task_struct(current->group_leader);
 791         task_lock(current->group_leader);
 792         pid = task_pid_nr(current->group_leader);
 793         /*
 794          * don't bother to store task struct for kernel threads,
 795          * they can't be killed anyway
 796          */
 797         if (current->group_leader->flags & PF_KTHREAD) {
 798                 put_task_struct(current->group_leader);
 799                 task = NULL;
 800         } else {
 801                 task = current->group_leader;
 802         }
 803         task_unlock(current->group_leader);
 804
 805         client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
 806         if (!client)
 807                 goto err_put_task_struct;
 808
 809         client->dev = dev;
 810         client->handles = RB_ROOT;
 811         idr_init(&client->idr);
 812         mutex_init(&client->lock);
 813         client->task = task;
 814         client->pid = pid;
 815         client->name = kstrdup(name, GFP_KERNEL);
 816         if (!client->name)
 817                 goto err_free_client;
 818
 819         down_write(&dev->lock);
 820         client->display_serial = ion_get_client_serial(&dev->clients, name);
 821         client->display_name = kasprintf(
 822                 GFP_KERNEL, "%s-%d", name, client->display_serial);
 823         if (!client->display_name) {
 824                 up_write(&dev->lock);
 825                 goto err_free_client_name;
 826         }
 827         p = &dev->clients.rb_node;
 828         while (*p) {
 829                 parent = *p;
 830                 entry = rb_entry(parent, struct ion_client, node);
 831
 832                 if (client < entry)
 833                         p = &(*p)->rb_left;
 834                 else if (client > entry)
 835                         p = &(*p)->rb_right;
 836         }
 837         rb_link_node(&client->node, parent, p);
 838         rb_insert_color(&client->node, &dev->clients);
 839
 840         client->debug_root = debugfs_create_file(client->display_name, 0664,
 841                                                 dev->clients_debug_root,
 842                                                 client, &debug_client_fops);
 843         if (!client->debug_root) {
 844                 char buf[256], *path;
 845
 846                 path = dentry_path(dev->clients_debug_root, buf, 256);
 847                 pr_err("Failed to create client debugfs at %s/%s\n",
 848                         path, client->display_name);
 849         }
 850
 851         up_write(&dev->lock);
 852
 853         return client;
 854
 855 err_free_client_name:
 856         kfree(client->name);
 857 err_free_client:
 858         kfree(client);
 859 err_put_task_struct:
 860         if (task)
 861                 put_task_struct(current->group_leader);
 862         return ERR_PTR(-ENOMEM);
 863 }
 864 EXPORT_SYMBOL(ion_client_create);
 865
 866 void ion_client_destroy(struct ion_client *client)
 867 {
 868         struct ion_device *dev = client->dev;
 869         struct rb_node *n;
 870
 871         pr_debug("%s: %d\n", __func__, __LINE__);
 872         mutex_lock(&debugfs_mutex);
 873         while ((n = rb_first(&client->handles))) {
 874                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 875                                                      node);
 876                 ion_handle_destroy(&handle->ref);
 877         }
 878
 879         idr_destroy(&client->idr);
 880
 881         down_write(&dev->lock);
 882         if (client->task)
 883                 put_task_struct(client->task);
 884         rb_erase(&client->node, &dev->clients);
 885         debugfs_remove_recursive(client->debug_root);
 886         up_write(&dev->lock);
 887
 888         kfree(client->display_name);
 889         kfree(client->name);
 890         kfree(client);
 891         mutex_unlock(&debugfs_mutex);
 892 }
 893 EXPORT_SYMBOL(ion_client_destroy);
 894
 895 struct sg_table *ion_sg_table(struct ion_client *client,
 896                               struct ion_handle *handle)
 897 {
 898         struct ion_buffer *buffer;
 899         struct sg_table *table;
 900
 901         mutex_lock(&client->lock);
 902         if (!ion_handle_validate(client, handle)) {
 903                 pr_err("%s: invalid handle passed to map_dma.\n",
 904                        __func__);
 905                 mutex_unlock(&client->lock);
 906                 return ERR_PTR(-EINVAL);
 907         }
 908         buffer = handle->buffer;
 909         table = buffer->sg_table;
 910         mutex_unlock(&client->lock);
 911         return table;
 912 }
 913 EXPORT_SYMBOL(ion_sg_table);
 914
 915 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 916                                        struct device *dev,
 917                                        enum dma_data_direction direction);
 918
 919 static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
 920                                         enum dma_data_direction direction)
 921 {
 922         struct dma_buf *dmabuf = attachment->dmabuf;
 923         struct ion_buffer *buffer = dmabuf->priv;
 924
 925         ion_buffer_sync_for_device(buffer, attachment->dev, direction);
 926         return buffer->sg_table;
 927 }
 928
 929 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
 930                               struct sg_table *table,
 931                               enum dma_data_direction direction)
 932 {
 933 }
 934
 935 void ion_pages_sync_for_device(struct device *dev, struct page *page,
 936                 size_t size, enum dma_data_direction dir)
 937 {
 938         struct scatterlist sg;
 939
 940         sg_init_table(&sg, 1);
 941         sg_set_page(&sg, page, size, 0);
 942         /*
 943          * This is not correct - sg_dma_address needs a dma_addr_t that is valid
 944          * for the targeted device, but this works on the currently targeted
 945          * hardware.
 946          */
 947         sg_dma_address(&sg) = page_to_phys(page);
 948         dma_sync_sg_for_device(dev, &sg, 1, dir);
 949 }
 950
 951 struct ion_vma_list {
 952         struct list_head list;
 953         struct vm_area_struct *vma;
 954 };
 955
 956 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 957                                        struct device *dev,
 958                                        enum dma_data_direction dir)
 959 {
 960         struct ion_vma_list *vma_list;
 961         int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 962         int i;
 963
 964         pr_debug("%s: syncing for device %s\n", __func__,
 965                  dev ? dev_name(dev) : "null");
 966
 967         if (!ion_buffer_fault_user_mappings(buffer))
 968                 return;
 969
 970         mutex_lock(&buffer->lock);
 971         for (i = 0; i < pages; i++) {
 972                 struct page *page = buffer->pages[i];
 973
 974                 if (ion_buffer_page_is_dirty(page))
 975                         ion_pages_sync_for_device(dev, ion_buffer_page(page),
 976                                                         PAGE_SIZE, dir);
 977
 978                 ion_buffer_page_clean(buffer->pages + i);
 979         }
 980         list_for_each_entry(vma_list, &buffer->vmas, list) {
 981                 struct vm_area_struct *vma = vma_list->vma;
 982
 983                 zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
 984                                NULL);
 985         }
 986         mutex_unlock(&buffer->lock);
 987 }
 988
 989 static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 990 {
 991         struct ion_buffer *buffer = vma->vm_private_data;
 992         unsigned long pfn;
 993         int ret;
 994
 995         mutex_lock(&buffer->lock);
 996         ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
 997         BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
 998
 999         pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
1000         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
1001         mutex_unlock(&buffer->lock);
1002         if (ret)
1003                 return VM_FAULT_ERROR;
1004
1005         return VM_FAULT_NOPAGE;
1006 }
1007
1008 static void ion_vm_open(struct vm_area_struct *vma)
1009 {
1010         struct ion_buffer *buffer = vma->vm_private_data;
1011         struct ion_vma_list *vma_list;
1012
1013         vma_list = kmalloc(sizeof(struct ion_vma_list), GFP_KERNEL);
1014         if (!vma_list)
1015                 return;
1016         vma_list->vma = vma;
1017         mutex_lock(&buffer->lock);
1018         list_add(&vma_list->list, &buffer->vmas);
1019         mutex_unlock(&buffer->lock);
1020         pr_debug("%s: adding %p\n", __func__, vma);
1021 }
1022
1023 static void ion_vm_close(struct vm_area_struct *vma)
1024 {
1025         struct ion_buffer *buffer = vma->vm_private_data;
1026         struct ion_vma_list *vma_list, *tmp;
1027
1028         pr_debug("%s\n", __func__);
1029         mutex_lock(&buffer->lock);
1030         list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
1031                 if (vma_list->vma != vma)
1032                         continue;
1033                 list_del(&vma_list->list);
1034                 kfree(vma_list);
1035                 pr_debug("%s: deleting %p\n", __func__, vma);
1036                 break;
1037         }
1038         mutex_unlock(&buffer->lock);
1039 }
1040
1041 static const struct vm_operations_struct ion_vma_ops = {
1042         .open = ion_vm_open,
1043         .close = ion_vm_close,
1044         .fault = ion_vm_fault,
1045 };
1046
1047 static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
1048 {
1049         struct ion_buffer *buffer = dmabuf->priv;
1050         int ret = 0;
1051
1052         if (!buffer->heap->ops->map_user) {
1053                 pr_err("%s: this heap does not define a method for mapping to userspace\n",
1054                         __func__);
1055                 return -EINVAL;
1056         }
1057
1058         if (ion_buffer_fault_user_mappings(buffer)) {
1059                 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
1060                                                         VM_DONTDUMP;
1061                 vma->vm_private_data = buffer;
1062                 vma->vm_ops = &ion_vma_ops;
1063                 ion_vm_open(vma);
1064                 return 0;
1065         }
1066
1067         if (!(buffer->flags & ION_FLAG_CACHED))
1068                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1069
1070         mutex_lock(&buffer->lock);
1071         /* now map it to userspace */
1072         ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
1073         mutex_unlock(&buffer->lock);
1074
1075         if (ret)
1076                 pr_err("%s: failure mapping buffer to userspace\n",
1077                        __func__);
1078
1079         return ret;
1080 }
1081
1082 static void ion_dma_buf_release(struct dma_buf *dmabuf)
1083 {
1084         struct ion_buffer *buffer = dmabuf->priv;
1085
1086         ion_buffer_put(buffer);
1087 }
1088
1089 static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
1090 {
1091         struct ion_buffer *buffer = dmabuf->priv;
1092
1093         return buffer->vaddr + offset * PAGE_SIZE;
1094 }
1095
1096 static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
1097                                void *ptr)
1098 {
1099 }
1100
1101 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
1102                                         enum dma_data_direction direction)
1103 {
1104         struct ion_buffer *buffer = dmabuf->priv;
1105         void *vaddr;
1106
1107         if (!buffer->heap->ops->map_kernel) {
1108                 pr_err("%s: map kernel is not implemented by this heap.\n",
1109                        __func__);
1110                 return -ENODEV;
1111         }
1112
1113         mutex_lock(&buffer->lock);
1114         vaddr = ion_buffer_kmap_get(buffer);
1115         mutex_unlock(&buffer->lock);
1116         return PTR_ERR_OR_ZERO(vaddr);
1117 }
1118
1119 static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
1120                                        enum dma_data_direction direction)
1121 {
1122         struct ion_buffer *buffer = dmabuf->priv;
1123
1124         mutex_lock(&buffer->lock);
1125         ion_buffer_kmap_put(buffer);
1126         mutex_unlock(&buffer->lock);
1127 }
1128
1129 static struct dma_buf_ops dma_buf_ops = {
1130         .map_dma_buf = ion_map_dma_buf,
1131         .unmap_dma_buf = ion_unmap_dma_buf,
1132         .mmap = ion_mmap,
1133         .release = ion_dma_buf_release,
1134         .begin_cpu_access = ion_dma_buf_begin_cpu_access,
1135         .end_cpu_access = ion_dma_buf_end_cpu_access,
1136         .kmap_atomic = ion_dma_buf_kmap,
1137         .kunmap_atomic = ion_dma_buf_kunmap,
1138         .kmap = ion_dma_buf_kmap,
1139         .kunmap = ion_dma_buf_kunmap,
1140 };
1141
1142 struct dma_buf *ion_share_dma_buf(struct ion_client *client,
1143                                                 struct ion_handle *handle)
1144 {
1145         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1146         struct ion_buffer *buffer;
1147         struct dma_buf *dmabuf;
1148         bool valid_handle;
1149
1150         mutex_lock(&client->lock);
1151         valid_handle = ion_handle_validate(client, handle);
1152         if (!valid_handle) {
1153                 WARN(1, "%s: invalid handle passed to share.\n", __func__);
1154                 mutex_unlock(&client->lock);
1155                 return ERR_PTR(-EINVAL);
1156         }
1157         buffer = handle->buffer;
1158         ion_buffer_get(buffer);
1159         mutex_unlock(&client->lock);
1160
1161         exp_info.ops = &dma_buf_ops;
1162         exp_info.size = buffer->size;
1163         exp_info.flags = O_RDWR;
1164         exp_info.priv = buffer;
1165
1166         dmabuf = dma_buf_export(&exp_info);
1167         if (IS_ERR(dmabuf)) {
1168                 ion_buffer_put(buffer);
1169                 return dmabuf;
1170         }
1171
1172         return dmabuf;
1173 }
1174 EXPORT_SYMBOL(ion_share_dma_buf);
1175
1176 int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
1177 {
1178         struct dma_buf *dmabuf;
1179         int fd;
1180
1181         dmabuf = ion_share_dma_buf(client, handle);
1182         if (IS_ERR(dmabuf))
1183                 return PTR_ERR(dmabuf);
1184
1185         fd = dma_buf_fd(dmabuf, O_CLOEXEC);
1186         if (fd < 0)
1187                 dma_buf_put(dmabuf);
1188
1189         return fd;
1190 }
1191 EXPORT_SYMBOL(ion_share_dma_buf_fd);
1192
1193 struct ion_handle *ion_import_dma_buf(struct ion_client *client,
1194                                       struct dma_buf *dmabuf)
1195 {
1196         struct ion_buffer *buffer;
1197         struct ion_handle *handle;
1198         int ret;
1199
1200         /* if this memory came from ion */
1201
1202         if (dmabuf->ops != &dma_buf_ops) {
1203                 pr_err("%s: can not import dmabuf from another exporter\n",
1204                        __func__);
1205                 return ERR_PTR(-EINVAL);
1206         }
1207         buffer = dmabuf->priv;
1208
1209         mutex_lock(&client->lock);
1210         /* if a handle exists for this buffer just take a reference to it */
1211         handle = ion_handle_lookup(client, buffer);
1212         if (!IS_ERR(handle)) {
1213                 ion_handle_get(handle);
1214                 mutex_unlock(&client->lock);
1215                 goto end;
1216         }
1217
1218         handle = ion_handle_create(client, buffer);
1219         if (IS_ERR(handle)) {
1220                 mutex_unlock(&client->lock);
1221                 goto end;
1222         }
1223
1224         ret = ion_handle_add(client, handle);
1225         mutex_unlock(&client->lock);
1226         if (ret) {
1227                 ion_handle_put(handle);
1228                 handle = ERR_PTR(ret);
1229         }
1230
1231 end:
1232         return handle;
1233 }
1234 EXPORT_SYMBOL(ion_import_dma_buf);
1235
1236 struct ion_handle *ion_import_dma_buf_fd(struct ion_client *client, int fd)
1237 {
1238         struct dma_buf *dmabuf;
1239         struct ion_handle *handle;
1240
1241         dmabuf = dma_buf_get(fd);
1242         if (IS_ERR(dmabuf))
1243                 return ERR_CAST(dmabuf);
1244
1245         handle = ion_import_dma_buf(client, dmabuf);
1246         dma_buf_put(dmabuf);
1247         return handle;
1248 }
1249 EXPORT_SYMBOL(ion_import_dma_buf_fd);
1250
1251 static int ion_sync_for_device(struct ion_client *client, int fd)
1252 {
1253         struct dma_buf *dmabuf;
1254         struct ion_buffer *buffer;
1255
1256         dmabuf = dma_buf_get(fd);
1257         if (IS_ERR(dmabuf))
1258                 return PTR_ERR(dmabuf);
1259
1260         /* if this memory came from ion */
1261         if (dmabuf->ops != &dma_buf_ops) {
1262                 pr_err("%s: can not sync dmabuf from another exporter\n",
1263                        __func__);
1264                 dma_buf_put(dmabuf);
1265                 return -EINVAL;
1266         }
1267         buffer = dmabuf->priv;
1268
1269         dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
1270                                buffer->sg_table->nents, DMA_BIDIRECTIONAL);
1271         dma_buf_put(dmabuf);
1272         return 0;
1273 }
1274
1275 /* fix up the cases where the ioctl direction bits are incorrect */
1276 static unsigned int ion_ioctl_dir(unsigned int cmd)
1277 {
1278         switch (cmd) {
1279         case ION_IOC_SYNC:
1280         case ION_IOC_FREE:
1281         case ION_IOC_CUSTOM:
1282                 return _IOC_WRITE;
1283         default:
1284                 return _IOC_DIR(cmd);
1285         }
1286 }
1287
1288 static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1289 {
1290         struct ion_client *client = filp->private_data;
1291         struct ion_device *dev = client->dev;
1292         struct ion_handle *cleanup_handle = NULL;
1293         int ret = 0;
1294         unsigned int dir;
1295
1296         union {
1297                 struct ion_fd_data fd;
1298                 struct ion_allocation_data allocation;
1299                 struct ion_handle_data handle;
1300                 struct ion_custom_data custom;
1301         } data;
1302
1303         dir = ion_ioctl_dir(cmd);
1304
1305         if (_IOC_SIZE(cmd) > sizeof(data))
1306                 return -EINVAL;
1307
1308         if (dir & _IOC_WRITE)
1309                 if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
1310                         return -EFAULT;
1311
1312         switch (cmd) {
1313         case ION_IOC_ALLOC:
1314         {
1315                 struct ion_handle *handle;
1316
1317                 handle = ion_alloc(client, data.allocation.len,
1318                                                 data.allocation.align,
1319                                                 data.allocation.heap_id_mask,
1320                                                 data.allocation.flags);
1321                 if (IS_ERR(handle))
1322                         return PTR_ERR(handle);
1323
1324                 data.allocation.handle = handle->id;
1325
1326                 cleanup_handle = handle;
1327                 break;
1328         }
1329         case ION_IOC_FREE:
1330         {
1331                 struct ion_handle *handle;
1332
1333                 handle = ion_handle_get_by_id(client, data.handle.handle);
1334                 if (IS_ERR(handle))
1335                         return PTR_ERR(handle);
1336                 ion_free(client, handle);
1337                 ion_handle_put(handle);
1338                 break;
1339         }
1340         case ION_IOC_SHARE:
1341         case ION_IOC_MAP:
1342         {
1343                 struct ion_handle *handle;
1344
1345                 handle = ion_handle_get_by_id(client, data.handle.handle);
1346                 if (IS_ERR(handle))
1347                         return PTR_ERR(handle);
1348                 data.fd.fd = ion_share_dma_buf_fd(client, handle);
1349                 ion_handle_put(handle);
1350                 if (data.fd.fd < 0)
1351                         ret = data.fd.fd;
1352                 break;
1353         }
1354         case ION_IOC_IMPORT:
1355         {
1356                 struct ion_handle *handle;
1357
1358                 handle = ion_import_dma_buf_fd(client, data.fd.fd);
1359                 if (IS_ERR(handle))
1360                         ret = PTR_ERR(handle);
1361                 else
1362                         data.handle.handle = handle->id;
1363                 break;
1364         }
1365         case ION_IOC_SYNC:
1366         {
1367                 ret = ion_sync_for_device(client, data.fd.fd);
1368                 break;
1369         }
1370         case ION_IOC_CUSTOM:
1371         {
1372                 if (!dev->custom_ioctl)
1373                         return -ENOTTY;
1374                 ret = dev->custom_ioctl(client, data.custom.cmd,
1375                                                 data.custom.arg);
1376                 break;
1377         }
1378         default:
1379                 return -ENOTTY;
1380         }
1381
1382         if (dir & _IOC_READ) {
1383                 if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
1384                         if (cleanup_handle)
1385                                 ion_free(client, cleanup_handle);
1386                         return -EFAULT;
1387                 }
1388         }
1389         return ret;
1390 }
1391
1392 static int ion_release(struct inode *inode, struct file *file)
1393 {
1394         struct ion_client *client = file->private_data;
1395
1396         pr_debug("%s: %d\n", __func__, __LINE__);
1397         ion_client_destroy(client);
1398         return 0;
1399 }
1400
1401 static int ion_open(struct inode *inode, struct file *file)
1402 {
1403         struct miscdevice *miscdev = file->private_data;
1404         struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
1405         struct ion_client *client;
1406         char debug_name[64];
1407
1408         pr_debug("%s: %d\n", __func__, __LINE__);
1409         snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
1410         client = ion_client_create(dev, debug_name);
1411         if (IS_ERR(client))
1412                 return PTR_ERR(client);
1413         file->private_data = client;
1414
1415         return 0;
1416 }
1417
1418 static const struct file_operations ion_fops = {
1419         .owner          = THIS_MODULE,
1420         .open           = ion_open,
1421         .release        = ion_release,
1422         .unlocked_ioctl = ion_ioctl,
1423         .compat_ioctl   = compat_ion_ioctl,
1424 };
1425
1426 static size_t ion_debug_heap_total(struct ion_client *client,
1427                                    unsigned int id)
1428 {
1429         size_t size = 0;
1430         struct rb_node *n;
1431
1432         mutex_lock(&client->lock);
1433         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1434                 struct ion_handle *handle = rb_entry(n,
1435                                                      struct ion_handle,
1436                                                      node);
1437                 if (handle->buffer->heap->id == id)
1438                         size += handle->buffer->size;
1439         }
1440         mutex_unlock(&client->lock);
1441         return size;
1442 }
1443
1444 static int ion_debug_heap_show(struct seq_file *s, void *unused)
1445 {
1446         struct ion_heap *heap = s->private;
1447         struct ion_device *dev = heap->dev;
1448         struct rb_node *n;
1449         size_t total_size = 0;
1450         size_t total_orphaned_size = 0;
1451
1452         seq_printf(s, "%16s %16s %16s\n", "client", "pid", "size");
1453         seq_puts(s, "----------------------------------------------------\n");
1454
1455         mutex_lock(&debugfs_mutex);
1456         for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
1457                 struct ion_client *client = rb_entry(n, struct ion_client,
1458                                                      node);
1459                 size_t size = ion_debug_heap_total(client, heap->id);
1460
1461                 if (!size)
1462                         continue;
1463                 if (client->task) {
1464                         char task_comm[TASK_COMM_LEN];
1465
1466                         get_task_comm(task_comm, client->task);
1467                         seq_printf(s, "%16s %16u %16zu\n", task_comm,
1468                                    client->pid, size);
1469                 } else {
1470                         seq_printf(s, "%16s %16u %16zu\n", client->name,
1471                                    client->pid, size);
1472                 }
1473         }
1474         mutex_unlock(&debugfs_mutex);
1475
1476         seq_puts(s, "----------------------------------------------------\n");
1477         seq_puts(s, "orphaned allocations (info is from last known client):\n");
1478         mutex_lock(&dev->buffer_lock);
1479         for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
1480                 struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
1481                                                      node);
1482                 if (buffer->heap->id != heap->id)
1483                         continue;
1484                 total_size += buffer->size;
1485                 if (!buffer->handle_count) {
1486                         seq_printf(s, "%16s %16u %16zu %d %d\n",
1487                                    buffer->task_comm, buffer->pid,
1488                                    buffer->size, buffer->kmap_cnt,
1489                                    atomic_read(&buffer->ref.refcount));
1490                         total_orphaned_size += buffer->size;
1491                 }
1492         }
1493         mutex_unlock(&dev->buffer_lock);
1494         seq_puts(s, "----------------------------------------------------\n");
1495         seq_printf(s, "%16s %16zu\n", "total orphaned",
1496                    total_orphaned_size);
1497         seq_printf(s, "%16s %16zu\n", "total ", total_size);
1498         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1499                 seq_printf(s, "%16s %16zu\n", "deferred free",
1500                                 heap->free_list_size);
1501         seq_puts(s, "----------------------------------------------------\n");
1502
1503         if (heap->debug_show)
1504                 heap->debug_show(heap, s, unused);
1505
1506         return 0;
1507 }
1508
1509 static int ion_debug_heap_open(struct inode *inode, struct file *file)
1510 {
1511         return single_open(file, ion_debug_heap_show, inode->i_private);
1512 }
1513
1514 static const struct file_operations debug_heap_fops = {
1515         .open = ion_debug_heap_open,
1516         .read = seq_read,
1517         .llseek = seq_lseek,
1518         .release = single_release,
1519 };
1520
1521 static int debug_shrink_set(void *data, u64 val)
1522 {
1523         struct ion_heap *heap = data;
1524         struct shrink_control sc;
1525         int objs;
1526
1527         sc.gfp_mask = -1;
1528         sc.nr_to_scan = val;
1529
1530         if (!val) {
1531                 objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1532                 sc.nr_to_scan = objs;
1533         }
1534
1535         heap->shrinker.scan_objects(&heap->shrinker, &sc);
1536         return 0;
1537 }
1538
1539 static int debug_shrink_get(void *data, u64 *val)
1540 {
1541         struct ion_heap *heap = data;
1542         struct shrink_control sc;
1543         int objs;
1544
1545         sc.gfp_mask = -1;
1546         sc.nr_to_scan = 0;
1547
1548         objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1549         *val = objs;
1550         return 0;
1551 }
1552
1553 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
1554                         debug_shrink_set, "%llu\n");
1555
1556 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
1557 {
1558         struct dentry *debug_file;
1559
1560         if (!heap->ops->allocate || !heap->ops->free || !heap->ops->map_dma ||
1561             !heap->ops->unmap_dma)
1562                 pr_err("%s: can not add heap with invalid ops struct.\n",
1563                        __func__);
1564
1565         spin_lock_init(&heap->free_lock);
1566         heap->free_list_size = 0;
1567
1568         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1569                 ion_heap_init_deferred_free(heap);
1570
1571         if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
1572                 ion_heap_init_shrinker(heap);
1573
1574         heap->dev = dev;
1575         down_write(&dev->lock);
1576         /*
1577          * use negative heap->id to reverse the priority -- when traversing
1578          * the list later attempt higher id numbers first
1579          */
1580         plist_node_init(&heap->node, -heap->id);
1581         plist_add(&heap->node, &dev->heaps);
1582         debug_file = debugfs_create_file(heap->name, 0664,
1583                                         dev->heaps_debug_root, heap,
1584                                         &debug_heap_fops);
1585
1586         if (!debug_file) {
1587                 char buf[256], *path;
1588
1589                 path = dentry_path(dev->heaps_debug_root, buf, 256);
1590                 pr_err("Failed to create heap debugfs at %s/%s\n",
1591                         path, heap->name);
1592         }
1593
1594         if (heap->shrinker.count_objects && heap->shrinker.scan_objects) {
1595                 char debug_name[64];
1596
1597                 snprintf(debug_name, 64, "%s_shrink", heap->name);
1598                 debug_file = debugfs_create_file(
1599                         debug_name, 0644, dev->heaps_debug_root, heap,
1600                         &debug_shrink_fops);
1601                 if (!debug_file) {
1602                         char buf[256], *path;
1603
1604                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1605                         pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
1606                                 path, debug_name);
1607                 }
1608         }
1609
1610         up_write(&dev->lock);
1611 }
1612 EXPORT_SYMBOL(ion_device_add_heap);
1613
1614 struct ion_device *ion_device_create(long (*custom_ioctl)
1615                                      (struct ion_client *client,
1616                                       unsigned int cmd,
1617                                       unsigned long arg))
1618 {
1619         struct ion_device *idev;
1620         int ret;
1621
1622         idev = kzalloc(sizeof(struct ion_device), GFP_KERNEL);
1623         if (!idev)
1624                 return ERR_PTR(-ENOMEM);
1625
1626         idev->dev.minor = MISC_DYNAMIC_MINOR;
1627         idev->dev.name = "ion";
1628         idev->dev.fops = &ion_fops;
1629         idev->dev.parent = NULL;
1630         ret = misc_register(&idev->dev);
1631         if (ret) {
1632                 pr_err("ion: failed to register misc device.\n");
1633                 kfree(idev);
1634                 return ERR_PTR(ret);
1635         }
1636
1637         idev->debug_root = debugfs_create_dir("ion", NULL);
1638         if (!idev->debug_root) {
1639                 pr_err("ion: failed to create debugfs root directory.\n");
1640                 goto debugfs_done;
1641         }
1642         idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
1643         if (!idev->heaps_debug_root) {
1644                 pr_err("ion: failed to create debugfs heaps directory.\n");
1645                 goto debugfs_done;
1646         }
1647         idev->clients_debug_root = debugfs_create_dir("clients",
1648                                                 idev->debug_root);
1649         if (!idev->clients_debug_root)
1650                 pr_err("ion: failed to create debugfs clients directory.\n");
1651
1652 debugfs_done:
1653
1654         idev->custom_ioctl = custom_ioctl;
1655         idev->buffers = RB_ROOT;
1656         mutex_init(&idev->buffer_lock);
1657         init_rwsem(&idev->lock);
1658         plist_head_init(&idev->heaps);
1659         idev->clients = RB_ROOT;
1660         ion_root_client = &idev->clients;
1661         mutex_init(&debugfs_mutex);
1662         return idev;
1663 }
1664 EXPORT_SYMBOL(ion_device_create);
1665
1666 void ion_device_destroy(struct ion_device *dev)
1667 {
1668         misc_deregister(&dev->dev);
1669         debugfs_remove_recursive(dev->debug_root);
1670         /* XXX need to free the heaps and clients ? */
1671         kfree(dev);
1672 }
1673 EXPORT_SYMBOL(ion_device_destroy);
1674
1675 void __init ion_reserve(struct ion_platform_data *data)
1676 {
1677         int i;
1678
1679         for (i = 0; i < data->nr; i++) {
1680                 if (data->heaps[i].size == 0)
1681                         continue;
1682
1683                 if (data->heaps[i].base == 0) {
1684                         phys_addr_t paddr;
1685
1686                         paddr = memblock_alloc_base(data->heaps[i].size,
1687                                                     data->heaps[i].align,
1688                                                     MEMBLOCK_ALLOC_ANYWHERE);
1689                         if (!paddr) {
1690                                 pr_err("%s: error allocating memblock for heap %d\n",
1691                                         __func__, i);
1692                                 continue;
1693                         }
1694                         data->heaps[i].base = paddr;
1695                 } else {
1696                         int ret = memblock_reserve(data->heaps[i].base,
1697                                                data->heaps[i].size);
1698                         if (ret)
1699                                 pr_err("memblock reserve of %zx@%lx failed\n",
1700                                        data->heaps[i].size,
1701                                        data->heaps[i].base);
1702                 }
1703                 pr_info("%s: %s reserved base %lx size %zu\n", __func__,
1704                         data->heaps[i].name,
1705                         data->heaps[i].base,
1706                         data->heaps[i].size);
1707         }
1708 }