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                 heap->ops->free(buffer);
 217                 kfree(buffer);
 218                 return ERR_CAST(table);
 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 err1;
 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                 if (ret)
 240                         goto err;
 241         }
 242
 243         buffer->dev = dev;
 244         buffer->size = len;
 245         INIT_LIST_HEAD(&buffer->vmas);
 246         mutex_init(&buffer->lock);
 247         /* this will set up dma addresses for the sglist -- it is not
 248            technically correct as per the dma api -- a specific
 249            device isn't really taking ownership here.  However, in practice on
 250            our systems the only dma_address space is physical addresses.
 251            Additionally, we can't afford the overhead of invalidating every
 252            allocation via dma_map_sg. The implicit contract here is that
 253            memory comming from the heaps is ready for dma, ie if it has a
 254            cached mapping that mapping has been invalidated */
 255         for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i)
 256                 sg_dma_address(sg) = sg_phys(sg);
 257         mutex_lock(&dev->buffer_lock);
 258         ion_buffer_add(dev, buffer);
 259         mutex_unlock(&dev->buffer_lock);
 260         return buffer;
 261
 262 err:
 263         heap->ops->unmap_dma(heap, buffer);
 264         heap->ops->free(buffer);
 265 err1:
 266         if (buffer->pages)
 267                 vfree(buffer->pages);
 268 err2:
 269         kfree(buffer);
 270         return ERR_PTR(ret);
 271 }
 272
 273 void ion_buffer_destroy(struct ion_buffer *buffer)
 274 {
 275         if (WARN_ON(buffer->kmap_cnt > 0))
 276                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 277         buffer->heap->ops->unmap_dma(buffer->heap, buffer);
 278         buffer->heap->ops->free(buffer);
 279         if (buffer->pages)
 280                 vfree(buffer->pages);
 281         kfree(buffer);
 282 }
 283
 284 static void _ion_buffer_destroy(struct kref *kref)
 285 {
 286         struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
 287         struct ion_heap *heap = buffer->heap;
 288         struct ion_device *dev = buffer->dev;
 289
 290         mutex_lock(&dev->buffer_lock);
 291         rb_erase(&buffer->node, &dev->buffers);
 292         mutex_unlock(&dev->buffer_lock);
 293
 294         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
 295                 ion_heap_freelist_add(heap, buffer);
 296         else
 297                 ion_buffer_destroy(buffer);
 298 }
 299
 300 static void ion_buffer_get(struct ion_buffer *buffer)
 301 {
 302         kref_get(&buffer->ref);
 303 }
 304
 305 static int ion_buffer_put(struct ion_buffer *buffer)
 306 {
 307         return kref_put(&buffer->ref, _ion_buffer_destroy);
 308 }
 309
 310 static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
 311 {
 312         mutex_lock(&buffer->lock);
 313         buffer->handle_count++;
 314         mutex_unlock(&buffer->lock);
 315 }
 316
 317 static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
 318 {
 319         /*
 320          * when a buffer is removed from a handle, if it is not in
 321          * any other handles, copy the taskcomm and the pid of the
 322          * process it's being removed from into the buffer.  At this
 323          * point there will be no way to track what processes this buffer is
 324          * being used by, it only exists as a dma_buf file descriptor.
 325          * The taskcomm and pid can provide a debug hint as to where this fd
 326          * is in the system
 327          */
 328         mutex_lock(&buffer->lock);
 329         buffer->handle_count--;
 330         BUG_ON(buffer->handle_count < 0);
 331         if (!buffer->handle_count) {
 332                 struct task_struct *task;
 333
 334                 task = current->group_leader;
 335                 get_task_comm(buffer->task_comm, task);
 336                 buffer->pid = task_pid_nr(task);
 337         }
 338         mutex_unlock(&buffer->lock);
 339 }
 340
 341 static struct ion_handle *ion_handle_create(struct ion_client *client,
 342                                      struct ion_buffer *buffer)
 343 {
 344         struct ion_handle *handle;
 345
 346         handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
 347         if (!handle)
 348                 return ERR_PTR(-ENOMEM);
 349         kref_init(&handle->ref);
 350         RB_CLEAR_NODE(&handle->node);
 351         handle->client = client;
 352         ion_buffer_get(buffer);
 353         ion_buffer_add_to_handle(buffer);
 354         handle->buffer = buffer;
 355
 356         return handle;
 357 }
 358
 359 static void ion_handle_kmap_put(struct ion_handle *);
 360
 361 static void ion_handle_destroy(struct kref *kref)
 362 {
 363         struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
 364         struct ion_client *client = handle->client;
 365         struct ion_buffer *buffer = handle->buffer;
 366
 367         mutex_lock(&buffer->lock);
 368         while (handle->kmap_cnt)
 369                 ion_handle_kmap_put(handle);
 370         mutex_unlock(&buffer->lock);
 371
 372         idr_remove(&client->idr, handle->id);
 373         if (!RB_EMPTY_NODE(&handle->node))
 374                 rb_erase(&handle->node, &client->handles);
 375
 376         ion_buffer_remove_from_handle(buffer);
 377         ion_buffer_put(buffer);
 378
 379         kfree(handle);
 380 }
 381
 382 struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
 383 {
 384         return handle->buffer;
 385 }
 386
 387 static void ion_handle_get(struct ion_handle *handle)
 388 {
 389         kref_get(&handle->ref);
 390 }
 391
 392 static int ion_handle_put(struct ion_handle *handle)
 393 {
 394         struct ion_client *client = handle->client;
 395         int ret;
 396
 397         mutex_lock(&client->lock);
 398         ret = kref_put(&handle->ref, ion_handle_destroy);
 399         mutex_unlock(&client->lock);
 400
 401         return ret;
 402 }
 403
 404 static struct ion_handle *ion_handle_lookup(struct ion_client *client,
 405                                             struct ion_buffer *buffer)
 406 {
 407         struct rb_node *n = client->handles.rb_node;
 408
 409         while (n) {
 410                 struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
 411
 412                 if (buffer < entry->buffer)
 413                         n = n->rb_left;
 414                 else if (buffer > entry->buffer)
 415                         n = n->rb_right;
 416                 else
 417                         return entry;
 418         }
 419         return ERR_PTR(-EINVAL);
 420 }
 421
 422 static struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
 423                                                 int id)
 424 {
 425         struct ion_handle *handle;
 426
 427         mutex_lock(&client->lock);
 428         handle = idr_find(&client->idr, id);
 429         if (handle)
 430                 ion_handle_get(handle);
 431         mutex_unlock(&client->lock);
 432
 433         return handle ? handle : ERR_PTR(-EINVAL);
 434 }
 435
 436 static bool ion_handle_validate(struct ion_client *client,
 437                                 struct ion_handle *handle)
 438 {
 439         WARN_ON(!mutex_is_locked(&client->lock));
 440         return idr_find(&client->idr, handle->id) == handle;
 441 }
 442
 443 static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
 444 {
 445         int id;
 446         struct rb_node **p = &client->handles.rb_node;
 447         struct rb_node *parent = NULL;
 448         struct ion_handle *entry;
 449
 450         id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
 451         if (id < 0)
 452                 return id;
 453
 454         handle->id = id;
 455
 456         while (*p) {
 457                 parent = *p;
 458                 entry = rb_entry(parent, struct ion_handle, node);
 459
 460                 if (handle->buffer < entry->buffer)
 461                         p = &(*p)->rb_left;
 462                 else if (handle->buffer > entry->buffer)
 463                         p = &(*p)->rb_right;
 464                 else
 465                         WARN(1, "%s: buffer already found.", __func__);
 466         }
 467
 468         rb_link_node(&handle->node, parent, p);
 469         rb_insert_color(&handle->node, &client->handles);
 470
 471         return 0;
 472 }
 473
 474 struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
 475                              size_t align, unsigned int heap_id_mask,
 476                              unsigned int flags)
 477 {
 478         struct ion_handle *handle;
 479         struct ion_device *dev = client->dev;
 480         struct ion_buffer *buffer = NULL;
 481         struct ion_heap *heap;
 482         int ret;
 483
 484         pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
 485                  len, align, heap_id_mask, flags);
 486         /*
 487          * traverse the list of heaps available in this system in priority
 488          * order.  If the heap type is supported by the client, and matches the
 489          * request of the caller allocate from it.  Repeat until allocate has
 490          * succeeded or all heaps have been tried
 491          */
 492         len = PAGE_ALIGN(len);
 493
 494         if (!len)
 495                 return ERR_PTR(-EINVAL);
 496
 497         down_read(&dev->lock);
 498         plist_for_each_entry(heap, &dev->heaps, node) {
 499                 /* if the caller didn't specify this heap id */
 500                 if (!((1 << heap->id) & heap_id_mask))
 501                         continue;
 502                 buffer = ion_buffer_create(heap, dev, len, align, flags);
 503                 if (!IS_ERR(buffer))
 504                         break;
 505         }
 506         up_read(&dev->lock);
 507
 508         if (buffer == NULL)
 509                 return ERR_PTR(-ENODEV);
 510
 511         if (IS_ERR(buffer))
 512                 return ERR_CAST(buffer);
 513
 514         handle = ion_handle_create(client, buffer);
 515
 516         /*
 517          * ion_buffer_create will create a buffer with a ref_cnt of 1,
 518          * and ion_handle_create will take a second reference, drop one here
 519          */
 520         ion_buffer_put(buffer);
 521
 522         if (IS_ERR(handle))
 523                 return handle;
 524
 525         mutex_lock(&client->lock);
 526         ret = ion_handle_add(client, handle);
 527         mutex_unlock(&client->lock);
 528         if (ret) {
 529                 ion_handle_put(handle);
 530                 handle = ERR_PTR(ret);
 531         }
 532
 533         return handle;
 534 }
 535 EXPORT_SYMBOL(ion_alloc);
 536
 537 void ion_free(struct ion_client *client, struct ion_handle *handle)
 538 {
 539         bool valid_handle;
 540
 541         BUG_ON(client != handle->client);
 542
 543         mutex_lock(&client->lock);
 544         valid_handle = ion_handle_validate(client, handle);
 545
 546         if (!valid_handle) {
 547                 WARN(1, "%s: invalid handle passed to free.\n", __func__);
 548                 mutex_unlock(&client->lock);
 549                 return;
 550         }
 551         mutex_unlock(&client->lock);
 552         ion_handle_put(handle);
 553 }
 554 EXPORT_SYMBOL(ion_free);
 555
 556 int ion_phys(struct ion_client *client, struct ion_handle *handle,
 557              ion_phys_addr_t *addr, size_t *len)
 558 {
 559         struct ion_buffer *buffer;
 560         int ret;
 561
 562         mutex_lock(&client->lock);
 563         if (!ion_handle_validate(client, handle)) {
 564                 mutex_unlock(&client->lock);
 565                 return -EINVAL;
 566         }
 567
 568         buffer = handle->buffer;
 569
 570         if (!buffer->heap->ops->phys) {
 571                 pr_err("%s: ion_phys is not implemented by this heap.\n",
 572                        __func__);
 573                 mutex_unlock(&client->lock);
 574                 return -ENODEV;
 575         }
 576         mutex_unlock(&client->lock);
 577         ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
 578         return ret;
 579 }
 580 EXPORT_SYMBOL(ion_phys);
 581
 582 static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
 583 {
 584         void *vaddr;
 585
 586         if (buffer->kmap_cnt) {
 587                 buffer->kmap_cnt++;
 588                 return buffer->vaddr;
 589         }
 590         vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
 591         if (WARN_ONCE(vaddr == NULL,
 592                         "heap->ops->map_kernel should return ERR_PTR on error"))
 593                 return ERR_PTR(-EINVAL);
 594         if (IS_ERR(vaddr))
 595                 return vaddr;
 596         buffer->vaddr = vaddr;
 597         buffer->kmap_cnt++;
 598         return vaddr;
 599 }
 600
 601 static void *ion_handle_kmap_get(struct ion_handle *handle)
 602 {
 603         struct ion_buffer *buffer = handle->buffer;
 604         void *vaddr;
 605
 606         if (handle->kmap_cnt) {
 607                 handle->kmap_cnt++;
 608                 return buffer->vaddr;
 609         }
 610         vaddr = ion_buffer_kmap_get(buffer);
 611         if (IS_ERR(vaddr))
 612                 return vaddr;
 613         handle->kmap_cnt++;
 614         return vaddr;
 615 }
 616
 617 static void ion_buffer_kmap_put(struct ion_buffer *buffer)
 618 {
 619         buffer->kmap_cnt--;
 620         if (!buffer->kmap_cnt) {
 621                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 622                 buffer->vaddr = NULL;
 623         }
 624 }
 625
 626 static void ion_handle_kmap_put(struct ion_handle *handle)
 627 {
 628         struct ion_buffer *buffer = handle->buffer;
 629
 630         if (!handle->kmap_cnt) {
 631                 WARN(1, "%s: Double unmap detected! bailing...\n", __func__);
 632                 return;
 633         }
 634         handle->kmap_cnt--;
 635         if (!handle->kmap_cnt)
 636                 ion_buffer_kmap_put(buffer);
 637 }
 638
 639 void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
 640 {
 641         struct ion_buffer *buffer;
 642         void *vaddr;
 643
 644         mutex_lock(&client->lock);
 645         if (!ion_handle_validate(client, handle)) {
 646                 pr_err("%s: invalid handle passed to map_kernel.\n",
 647                        __func__);
 648                 mutex_unlock(&client->lock);
 649                 return ERR_PTR(-EINVAL);
 650         }
 651
 652         buffer = handle->buffer;
 653
 654         if (!handle->buffer->heap->ops->map_kernel) {
 655                 pr_err("%s: map_kernel is not implemented by this heap.\n",
 656                        __func__);
 657                 mutex_unlock(&client->lock);
 658                 return ERR_PTR(-ENODEV);
 659         }
 660
 661         mutex_lock(&buffer->lock);
 662         vaddr = ion_handle_kmap_get(handle);
 663         mutex_unlock(&buffer->lock);
 664         mutex_unlock(&client->lock);
 665         return vaddr;
 666 }
 667 EXPORT_SYMBOL(ion_map_kernel);
 668
 669 void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
 670 {
 671         struct ion_buffer *buffer;
 672
 673         mutex_lock(&client->lock);
 674         buffer = handle->buffer;
 675         mutex_lock(&buffer->lock);
 676         ion_handle_kmap_put(handle);
 677         mutex_unlock(&buffer->lock);
 678         mutex_unlock(&client->lock);
 679 }
 680 EXPORT_SYMBOL(ion_unmap_kernel);
 681
 682 static int ion_debug_client_show(struct seq_file *s, void *unused)
 683 {
 684         struct ion_client *client = s->private;
 685         struct rb_node *n;
 686         size_t sizes[ION_NUM_HEAP_IDS] = {0};
 687         const char *names[ION_NUM_HEAP_IDS] = {NULL};
 688         int i;
 689
 690         mutex_lock(&client->lock);
 691         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
 692                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 693                                                      node);
 694                 unsigned int id = handle->buffer->heap->id;
 695
 696                 if (!names[id])
 697                         names[id] = handle->buffer->heap->name;
 698                 sizes[id] += handle->buffer->size;
 699         }
 700         mutex_unlock(&client->lock);
 701
 702         seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
 703         for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
 704                 if (!names[i])
 705                         continue;
 706                 seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
 707         }
 708         return 0;
 709 }
 710
 711 static int ion_debug_client_open(struct inode *inode, struct file *file)
 712 {
 713         return single_open(file, ion_debug_client_show, inode->i_private);
 714 }
 715
 716 static const struct file_operations debug_client_fops = {
 717         .open = ion_debug_client_open,
 718         .read = seq_read,
 719         .llseek = seq_lseek,
 720         .release = single_release,
 721 };
 722
 723 static int ion_get_client_serial(const struct rb_root *root,
 724                                         const unsigned char *name)
 725 {
 726         int serial = -1;
 727         struct rb_node *node;
 728
 729         for (node = rb_first(root); node; node = rb_next(node)) {
 730                 struct ion_client *client = rb_entry(node, struct ion_client,
 731                                                 node);
 732
 733                 if (strcmp(client->name, name))
 734                         continue;
 735                 serial = max(serial, client->display_serial);
 736         }
 737         return serial + 1;
 738 }
 739
 740 struct ion_client *ion_client_create(struct ion_device *dev,
 741                                      const char *name)
 742 {
 743         struct ion_client *client;
 744         struct task_struct *task;
 745         struct rb_node **p;
 746         struct rb_node *parent = NULL;
 747         struct ion_client *entry;
 748         pid_t pid;
 749
 750         if (!name) {
 751                 pr_err("%s: Name cannot be null\n", __func__);
 752                 return ERR_PTR(-EINVAL);
 753         }
 754
 755         get_task_struct(current->group_leader);
 756         task_lock(current->group_leader);
 757         pid = task_pid_nr(current->group_leader);
 758         /* don't bother to store task struct for kernel threads,
 759            they can't be killed anyway */
 760         if (current->group_leader->flags & PF_KTHREAD) {
 761                 put_task_struct(current->group_leader);
 762                 task = NULL;
 763         } else {
 764                 task = current->group_leader;
 765         }
 766         task_unlock(current->group_leader);
 767
 768         client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
 769         if (!client)
 770                 goto err_put_task_struct;
 771
 772         client->dev = dev;
 773         client->handles = RB_ROOT;
 774         idr_init(&client->idr);
 775         mutex_init(&client->lock);
 776         client->task = task;
 777         client->pid = pid;
 778         client->name = kstrdup(name, GFP_KERNEL);
 779         if (!client->name)
 780                 goto err_free_client;
 781
 782         down_write(&dev->lock);
 783         client->display_serial = ion_get_client_serial(&dev->clients, name);
 784         client->display_name = kasprintf(
 785                 GFP_KERNEL, "%s-%d", name, client->display_serial);
 786         if (!client->display_name) {
 787                 up_write(&dev->lock);
 788                 goto err_free_client_name;
 789         }
 790         p = &dev->clients.rb_node;
 791         while (*p) {
 792                 parent = *p;
 793                 entry = rb_entry(parent, struct ion_client, node);
 794
 795                 if (client < entry)
 796                         p = &(*p)->rb_left;
 797                 else if (client > entry)
 798                         p = &(*p)->rb_right;
 799         }
 800         rb_link_node(&client->node, parent, p);
 801         rb_insert_color(&client->node, &dev->clients);
 802
 803         client->debug_root = debugfs_create_file(client->display_name, 0664,
 804                                                 dev->clients_debug_root,
 805                                                 client, &debug_client_fops);
 806         if (!client->debug_root) {
 807                 char buf[256], *path;
 808                 path = dentry_path(dev->clients_debug_root, buf, 256);
 809                 pr_err("Failed to create client debugfs at %s/%s\n",
 810                         path, client->display_name);
 811         }
 812
 813         up_write(&dev->lock);
 814
 815         return client;
 816
 817 err_free_client_name:
 818         kfree(client->name);
 819 err_free_client:
 820         kfree(client);
 821 err_put_task_struct:
 822         if (task)
 823                 put_task_struct(current->group_leader);
 824         return ERR_PTR(-ENOMEM);
 825 }
 826 EXPORT_SYMBOL(ion_client_create);
 827
 828 void ion_client_destroy(struct ion_client *client)
 829 {
 830         struct ion_device *dev = client->dev;
 831         struct rb_node *n;
 832
 833         pr_debug("%s: %d\n", __func__, __LINE__);
 834         while ((n = rb_first(&client->handles))) {
 835                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 836                                                      node);
 837                 ion_handle_destroy(&handle->ref);
 838         }
 839
 840         idr_destroy(&client->idr);
 841
 842         down_write(&dev->lock);
 843         if (client->task)
 844                 put_task_struct(client->task);
 845         rb_erase(&client->node, &dev->clients);
 846         debugfs_remove_recursive(client->debug_root);
 847         up_write(&dev->lock);
 848
 849         kfree(client->display_name);
 850         kfree(client->name);
 851         kfree(client);
 852 }
 853 EXPORT_SYMBOL(ion_client_destroy);
 854
 855 struct sg_table *ion_sg_table(struct ion_client *client,
 856                               struct ion_handle *handle)
 857 {
 858         struct ion_buffer *buffer;
 859         struct sg_table *table;
 860
 861         mutex_lock(&client->lock);
 862         if (!ion_handle_validate(client, handle)) {
 863                 pr_err("%s: invalid handle passed to map_dma.\n",
 864                        __func__);
 865                 mutex_unlock(&client->lock);
 866                 return ERR_PTR(-EINVAL);
 867         }
 868         buffer = handle->buffer;
 869         table = buffer->sg_table;
 870         mutex_unlock(&client->lock);
 871         return table;
 872 }
 873 EXPORT_SYMBOL(ion_sg_table);
 874
 875 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 876                                        struct device *dev,
 877                                        enum dma_data_direction direction);
 878
 879 static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
 880                                         enum dma_data_direction direction)
 881 {
 882         struct dma_buf *dmabuf = attachment->dmabuf;
 883         struct ion_buffer *buffer = dmabuf->priv;
 884
 885         ion_buffer_sync_for_device(buffer, attachment->dev, direction);
 886         return buffer->sg_table;
 887 }
 888
 889 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
 890                               struct sg_table *table,
 891                               enum dma_data_direction direction)
 892 {
 893 }
 894
 895 void ion_pages_sync_for_device(struct device *dev, struct page *page,
 896                 size_t size, enum dma_data_direction dir)
 897 {
 898         struct scatterlist sg;
 899
 900         sg_init_table(&sg, 1);
 901         sg_set_page(&sg, page, size, 0);
 902         /*
 903          * This is not correct - sg_dma_address needs a dma_addr_t that is valid
 904          * for the the targeted device, but this works on the currently targeted
 905          * hardware.
 906          */
 907         sg_dma_address(&sg) = page_to_phys(page);
 908         dma_sync_sg_for_device(dev, &sg, 1, dir);
 909 }
 910
 911 struct ion_vma_list {
 912         struct list_head list;
 913         struct vm_area_struct *vma;
 914 };
 915
 916 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 917                                        struct device *dev,
 918                                        enum dma_data_direction dir)
 919 {
 920         struct ion_vma_list *vma_list;
 921         int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 922         int i;
 923
 924         pr_debug("%s: syncing for device %s\n", __func__,
 925                  dev ? dev_name(dev) : "null");
 926
 927         if (!ion_buffer_fault_user_mappings(buffer))
 928                 return;
 929
 930         mutex_lock(&buffer->lock);
 931         for (i = 0; i < pages; i++) {
 932                 struct page *page = buffer->pages[i];
 933
 934                 if (ion_buffer_page_is_dirty(page))
 935                         ion_pages_sync_for_device(dev, ion_buffer_page(page),
 936                                                         PAGE_SIZE, dir);
 937
 938                 ion_buffer_page_clean(buffer->pages + i);
 939         }
 940         list_for_each_entry(vma_list, &buffer->vmas, list) {
 941                 struct vm_area_struct *vma = vma_list->vma;
 942
 943                 zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
 944                                NULL);
 945         }
 946         mutex_unlock(&buffer->lock);
 947 }
 948
 949 static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 950 {
 951         struct ion_buffer *buffer = vma->vm_private_data;
 952         unsigned long pfn;
 953         int ret;
 954
 955         mutex_lock(&buffer->lock);
 956         ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
 957         BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
 958
 959         pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
 960         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
 961         mutex_unlock(&buffer->lock);
 962         if (ret)
 963                 return VM_FAULT_ERROR;
 964
 965         return VM_FAULT_NOPAGE;
 966 }
 967
 968 static void ion_vm_open(struct vm_area_struct *vma)
 969 {
 970         struct ion_buffer *buffer = vma->vm_private_data;
 971         struct ion_vma_list *vma_list;
 972
 973         vma_list = kmalloc(sizeof(struct ion_vma_list), GFP_KERNEL);
 974         if (!vma_list)
 975                 return;
 976         vma_list->vma = vma;
 977         mutex_lock(&buffer->lock);
 978         list_add(&vma_list->list, &buffer->vmas);
 979         mutex_unlock(&buffer->lock);
 980         pr_debug("%s: adding %p\n", __func__, vma);
 981 }
 982
 983 static void ion_vm_close(struct vm_area_struct *vma)
 984 {
 985         struct ion_buffer *buffer = vma->vm_private_data;
 986         struct ion_vma_list *vma_list, *tmp;
 987
 988         pr_debug("%s\n", __func__);
 989         mutex_lock(&buffer->lock);
 990         list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
 991                 if (vma_list->vma != vma)
 992                         continue;
 993                 list_del(&vma_list->list);
 994                 kfree(vma_list);
 995                 pr_debug("%s: deleting %p\n", __func__, vma);
 996                 break;
 997         }
 998         mutex_unlock(&buffer->lock);
 999 }
1000
1001 static struct vm_operations_struct ion_vma_ops = {
1002         .open = ion_vm_open,
1003         .close = ion_vm_close,
1004         .fault = ion_vm_fault,
1005 };
1006
1007 static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
1008 {
1009         struct ion_buffer *buffer = dmabuf->priv;
1010         int ret = 0;
1011
1012         if (!buffer->heap->ops->map_user) {
1013                 pr_err("%s: this heap does not define a method for mapping to userspace\n",
1014                         __func__);
1015                 return -EINVAL;
1016         }
1017
1018         if (ion_buffer_fault_user_mappings(buffer)) {
1019                 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
1020                                                         VM_DONTDUMP;
1021                 vma->vm_private_data = buffer;
1022                 vma->vm_ops = &ion_vma_ops;
1023                 ion_vm_open(vma);
1024                 return 0;
1025         }
1026
1027         if (!(buffer->flags & ION_FLAG_CACHED))
1028                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1029
1030         mutex_lock(&buffer->lock);
1031         /* now map it to userspace */
1032         ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
1033         mutex_unlock(&buffer->lock);
1034
1035         if (ret)
1036                 pr_err("%s: failure mapping buffer to userspace\n",
1037                        __func__);
1038
1039         return ret;
1040 }
1041
1042 static void ion_dma_buf_release(struct dma_buf *dmabuf)
1043 {
1044         struct ion_buffer *buffer = dmabuf->priv;
1045
1046         ion_buffer_put(buffer);
1047 }
1048
1049 static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
1050 {
1051         struct ion_buffer *buffer = dmabuf->priv;
1052
1053         return buffer->vaddr + offset * PAGE_SIZE;
1054 }
1055
1056 static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
1057                                void *ptr)
1058 {
1059         return;
1060 }
1061
1062 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
1063                                         size_t len,
1064                                         enum dma_data_direction direction)
1065 {
1066         struct ion_buffer *buffer = dmabuf->priv;
1067         void *vaddr;
1068
1069         if (!buffer->heap->ops->map_kernel) {
1070                 pr_err("%s: map kernel is not implemented by this heap.\n",
1071                        __func__);
1072                 return -ENODEV;
1073         }
1074
1075         mutex_lock(&buffer->lock);
1076         vaddr = ion_buffer_kmap_get(buffer);
1077         mutex_unlock(&buffer->lock);
1078         return PTR_ERR_OR_ZERO(vaddr);
1079 }
1080
1081 static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
1082                                        size_t len,
1083                                        enum dma_data_direction direction)
1084 {
1085         struct ion_buffer *buffer = dmabuf->priv;
1086
1087         mutex_lock(&buffer->lock);
1088         ion_buffer_kmap_put(buffer);
1089         mutex_unlock(&buffer->lock);
1090 }
1091
1092 static struct dma_buf_ops dma_buf_ops = {
1093         .map_dma_buf = ion_map_dma_buf,
1094         .unmap_dma_buf = ion_unmap_dma_buf,
1095         .mmap = ion_mmap,
1096         .release = ion_dma_buf_release,
1097         .begin_cpu_access = ion_dma_buf_begin_cpu_access,
1098         .end_cpu_access = ion_dma_buf_end_cpu_access,
1099         .kmap_atomic = ion_dma_buf_kmap,
1100         .kunmap_atomic = ion_dma_buf_kunmap,
1101         .kmap = ion_dma_buf_kmap,
1102         .kunmap = ion_dma_buf_kunmap,
1103 };
1104
1105 struct dma_buf *ion_share_dma_buf(struct ion_client *client,
1106                                                 struct ion_handle *handle)
1107 {
1108         struct ion_buffer *buffer;
1109         struct dma_buf *dmabuf;
1110         bool valid_handle;
1111
1112         mutex_lock(&client->lock);
1113         valid_handle = ion_handle_validate(client, handle);
1114         if (!valid_handle) {
1115                 WARN(1, "%s: invalid handle passed to share.\n", __func__);
1116                 mutex_unlock(&client->lock);
1117                 return ERR_PTR(-EINVAL);
1118         }
1119         buffer = handle->buffer;
1120         ion_buffer_get(buffer);
1121         mutex_unlock(&client->lock);
1122
1123         dmabuf = dma_buf_export(buffer, &dma_buf_ops, buffer->size, O_RDWR);
1124         if (IS_ERR(dmabuf)) {
1125                 ion_buffer_put(buffer);
1126                 return dmabuf;
1127         }
1128
1129         return dmabuf;
1130 }
1131 EXPORT_SYMBOL(ion_share_dma_buf);
1132
1133 int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
1134 {
1135         struct dma_buf *dmabuf;
1136         int fd;
1137
1138         dmabuf = ion_share_dma_buf(client, handle);
1139         if (IS_ERR(dmabuf))
1140                 return PTR_ERR(dmabuf);
1141
1142         fd = dma_buf_fd(dmabuf, O_CLOEXEC);
1143         if (fd < 0)
1144                 dma_buf_put(dmabuf);
1145
1146         return fd;
1147 }
1148 EXPORT_SYMBOL(ion_share_dma_buf_fd);
1149
1150 struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
1151 {
1152         struct dma_buf *dmabuf;
1153         struct ion_buffer *buffer;
1154         struct ion_handle *handle;
1155         int ret;
1156
1157         dmabuf = dma_buf_get(fd);
1158         if (IS_ERR(dmabuf))
1159                 return ERR_CAST(dmabuf);
1160         /* if this memory came from ion */
1161
1162         if (dmabuf->ops != &dma_buf_ops) {
1163                 pr_err("%s: can not import dmabuf from another exporter\n",
1164                        __func__);
1165                 dma_buf_put(dmabuf);
1166                 return ERR_PTR(-EINVAL);
1167         }
1168         buffer = dmabuf->priv;
1169
1170         mutex_lock(&client->lock);
1171         /* if a handle exists for this buffer just take a reference to it */
1172         handle = ion_handle_lookup(client, buffer);
1173         if (!IS_ERR(handle)) {
1174                 ion_handle_get(handle);
1175                 mutex_unlock(&client->lock);
1176                 goto end;
1177         }
1178         mutex_unlock(&client->lock);
1179
1180         handle = ion_handle_create(client, buffer);
1181         if (IS_ERR(handle))
1182                 goto end;
1183
1184         mutex_lock(&client->lock);
1185         ret = ion_handle_add(client, handle);
1186         mutex_unlock(&client->lock);
1187         if (ret) {
1188                 ion_handle_put(handle);
1189                 handle = ERR_PTR(ret);
1190         }
1191
1192 end:
1193         dma_buf_put(dmabuf);
1194         return handle;
1195 }
1196 EXPORT_SYMBOL(ion_import_dma_buf);
1197
1198 static int ion_sync_for_device(struct ion_client *client, int fd)
1199 {
1200         struct dma_buf *dmabuf;
1201         struct ion_buffer *buffer;
1202
1203         dmabuf = dma_buf_get(fd);
1204         if (IS_ERR(dmabuf))
1205                 return PTR_ERR(dmabuf);
1206
1207         /* if this memory came from ion */
1208         if (dmabuf->ops != &dma_buf_ops) {
1209                 pr_err("%s: can not sync dmabuf from another exporter\n",
1210                        __func__);
1211                 dma_buf_put(dmabuf);
1212                 return -EINVAL;
1213         }
1214         buffer = dmabuf->priv;
1215
1216         dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
1217                                buffer->sg_table->nents, DMA_BIDIRECTIONAL);
1218         dma_buf_put(dmabuf);
1219         return 0;
1220 }
1221
1222 /* fix up the cases where the ioctl direction bits are incorrect */
1223 static unsigned int ion_ioctl_dir(unsigned int cmd)
1224 {
1225         switch (cmd) {
1226         case ION_IOC_SYNC:
1227         case ION_IOC_FREE:
1228         case ION_IOC_CUSTOM:
1229                 return _IOC_WRITE;
1230         default:
1231                 return _IOC_DIR(cmd);
1232         }
1233 }
1234
1235 static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1236 {
1237         struct ion_client *client = filp->private_data;
1238         struct ion_device *dev = client->dev;
1239         struct ion_handle *cleanup_handle = NULL;
1240         int ret = 0;
1241         unsigned int dir;
1242
1243         union {
1244                 struct ion_fd_data fd;
1245                 struct ion_allocation_data allocation;
1246                 struct ion_handle_data handle;
1247                 struct ion_custom_data custom;
1248         } data;
1249
1250         dir = ion_ioctl_dir(cmd);
1251
1252         if (_IOC_SIZE(cmd) > sizeof(data))
1253                 return -EINVAL;
1254
1255         if (dir & _IOC_WRITE)
1256                 if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
1257                         return -EFAULT;
1258
1259         switch (cmd) {
1260         case ION_IOC_ALLOC:
1261         {
1262                 struct ion_handle *handle;
1263
1264                 handle = ion_alloc(client, data.allocation.len,
1265                                                 data.allocation.align,
1266                                                 data.allocation.heap_id_mask,
1267                                                 data.allocation.flags);
1268                 if (IS_ERR(handle))
1269                         return PTR_ERR(handle);
1270
1271                 data.allocation.handle = handle->id;
1272
1273                 cleanup_handle = handle;
1274                 break;
1275         }
1276         case ION_IOC_FREE:
1277         {
1278                 struct ion_handle *handle;
1279
1280                 handle = ion_handle_get_by_id(client, data.handle.handle);
1281                 if (IS_ERR(handle))
1282                         return PTR_ERR(handle);
1283                 ion_free(client, handle);
1284                 ion_handle_put(handle);
1285                 break;
1286         }
1287         case ION_IOC_SHARE:
1288         case ION_IOC_MAP:
1289         {
1290                 struct ion_handle *handle;
1291
1292                 handle = ion_handle_get_by_id(client, data.handle.handle);
1293                 if (IS_ERR(handle))
1294                         return PTR_ERR(handle);
1295                 data.fd.fd = ion_share_dma_buf_fd(client, handle);
1296                 ion_handle_put(handle);
1297                 if (data.fd.fd < 0)
1298                         ret = data.fd.fd;
1299                 break;
1300         }
1301         case ION_IOC_IMPORT:
1302         {
1303                 struct ion_handle *handle;
1304
1305                 handle = ion_import_dma_buf(client, data.fd.fd);
1306                 if (IS_ERR(handle))
1307                         ret = PTR_ERR(handle);
1308                 else
1309                         data.handle.handle = handle->id;
1310                 break;
1311         }
1312         case ION_IOC_SYNC:
1313         {
1314                 ret = ion_sync_for_device(client, data.fd.fd);
1315                 break;
1316         }
1317         case ION_IOC_CUSTOM:
1318         {
1319                 if (!dev->custom_ioctl)
1320                         return -ENOTTY;
1321                 ret = dev->custom_ioctl(client, data.custom.cmd,
1322                                                 data.custom.arg);
1323                 break;
1324         }
1325         default:
1326                 return -ENOTTY;
1327         }
1328
1329         if (dir & _IOC_READ) {
1330                 if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
1331                         if (cleanup_handle)
1332                                 ion_free(client, cleanup_handle);
1333                         return -EFAULT;
1334                 }
1335         }
1336         return ret;
1337 }
1338
1339 static int ion_release(struct inode *inode, struct file *file)
1340 {
1341         struct ion_client *client = file->private_data;
1342
1343         pr_debug("%s: %d\n", __func__, __LINE__);
1344         ion_client_destroy(client);
1345         return 0;
1346 }
1347
1348 static int ion_open(struct inode *inode, struct file *file)
1349 {
1350         struct miscdevice *miscdev = file->private_data;
1351         struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
1352         struct ion_client *client;
1353         char debug_name[64];
1354
1355         pr_debug("%s: %d\n", __func__, __LINE__);
1356         snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
1357         client = ion_client_create(dev, debug_name);
1358         if (IS_ERR(client))
1359                 return PTR_ERR(client);
1360         file->private_data = client;
1361
1362         return 0;
1363 }
1364
1365 static const struct file_operations ion_fops = {
1366         .owner          = THIS_MODULE,
1367         .open           = ion_open,
1368         .release        = ion_release,
1369         .unlocked_ioctl = ion_ioctl,
1370         .compat_ioctl   = compat_ion_ioctl,
1371 };
1372
1373 static size_t ion_debug_heap_total(struct ion_client *client,
1374                                    unsigned int id)
1375 {
1376         size_t size = 0;
1377         struct rb_node *n;
1378
1379         mutex_lock(&client->lock);
1380         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1381                 struct ion_handle *handle = rb_entry(n,
1382                                                      struct ion_handle,
1383                                                      node);
1384                 if (handle->buffer->heap->id == id)
1385                         size += handle->buffer->size;
1386         }
1387         mutex_unlock(&client->lock);
1388         return size;
1389 }
1390
1391 static int ion_debug_heap_show(struct seq_file *s, void *unused)
1392 {
1393         struct ion_heap *heap = s->private;
1394         struct ion_device *dev = heap->dev;
1395         struct rb_node *n;
1396         size_t total_size = 0;
1397         size_t total_orphaned_size = 0;
1398
1399         seq_printf(s, "%16.s %16.s %16.s\n", "client", "pid", "size");
1400         seq_puts(s, "----------------------------------------------------\n");
1401
1402         for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
1403                 struct ion_client *client = rb_entry(n, struct ion_client,
1404                                                      node);
1405                 size_t size = ion_debug_heap_total(client, heap->id);
1406
1407                 if (!size)
1408                         continue;
1409                 if (client->task) {
1410                         char task_comm[TASK_COMM_LEN];
1411
1412                         get_task_comm(task_comm, client->task);
1413                         seq_printf(s, "%16.s %16u %16zu\n", task_comm,
1414                                    client->pid, size);
1415                 } else {
1416                         seq_printf(s, "%16.s %16u %16zu\n", client->name,
1417                                    client->pid, size);
1418                 }
1419         }
1420         seq_puts(s, "----------------------------------------------------\n");
1421         seq_puts(s, "orphaned allocations (info is from last known client):\n");
1422         mutex_lock(&dev->buffer_lock);
1423         for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
1424                 struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
1425                                                      node);
1426                 if (buffer->heap->id != heap->id)
1427                         continue;
1428                 total_size += buffer->size;
1429                 if (!buffer->handle_count) {
1430                         seq_printf(s, "%16.s %16u %16zu %d %d\n",
1431                                    buffer->task_comm, buffer->pid,
1432                                    buffer->size, buffer->kmap_cnt,
1433                                    atomic_read(&buffer->ref.refcount));
1434                         total_orphaned_size += buffer->size;
1435                 }
1436         }
1437         mutex_unlock(&dev->buffer_lock);
1438         seq_puts(s, "----------------------------------------------------\n");
1439         seq_printf(s, "%16.s %16zu\n", "total orphaned",
1440                    total_orphaned_size);
1441         seq_printf(s, "%16.s %16zu\n", "total ", total_size);
1442         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1443                 seq_printf(s, "%16.s %16zu\n", "deferred free",
1444                                 heap->free_list_size);
1445         seq_puts(s, "----------------------------------------------------\n");
1446
1447         if (heap->debug_show)
1448                 heap->debug_show(heap, s, unused);
1449
1450         return 0;
1451 }
1452
1453 static int ion_debug_heap_open(struct inode *inode, struct file *file)
1454 {
1455         return single_open(file, ion_debug_heap_show, inode->i_private);
1456 }
1457
1458 static const struct file_operations debug_heap_fops = {
1459         .open = ion_debug_heap_open,
1460         .read = seq_read,
1461         .llseek = seq_lseek,
1462         .release = single_release,
1463 };
1464
1465 #ifdef DEBUG_HEAP_SHRINKER
1466 static int debug_shrink_set(void *data, u64 val)
1467 {
1468         struct ion_heap *heap = data;
1469         struct shrink_control sc;
1470         int objs;
1471
1472         sc.gfp_mask = -1;
1473         sc.nr_to_scan = 0;
1474
1475         if (!val)
1476                 return 0;
1477
1478         objs = heap->shrinker.shrink(&heap->shrinker, &sc);
1479         sc.nr_to_scan = objs;
1480
1481         heap->shrinker.shrink(&heap->shrinker, &sc);
1482         return 0;
1483 }
1484
1485 static int debug_shrink_get(void *data, u64 *val)
1486 {
1487         struct ion_heap *heap = data;
1488         struct shrink_control sc;
1489         int objs;
1490
1491         sc.gfp_mask = -1;
1492         sc.nr_to_scan = 0;
1493
1494         objs = heap->shrinker.shrink(&heap->shrinker, &sc);
1495         *val = objs;
1496         return 0;
1497 }
1498
1499 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
1500                         debug_shrink_set, "%llu\n");
1501 #endif
1502
1503 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
1504 {
1505         struct dentry *debug_file;
1506
1507         if (!heap->ops->allocate || !heap->ops->free || !heap->ops->map_dma ||
1508             !heap->ops->unmap_dma)
1509                 pr_err("%s: can not add heap with invalid ops struct.\n",
1510                        __func__);
1511
1512         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1513                 ion_heap_init_deferred_free(heap);
1514
1515         if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
1516                 ion_heap_init_shrinker(heap);
1517
1518         heap->dev = dev;
1519         down_write(&dev->lock);
1520         /* use negative heap->id to reverse the priority -- when traversing
1521            the list later attempt higher id numbers first */
1522         plist_node_init(&heap->node, -heap->id);
1523         plist_add(&heap->node, &dev->heaps);
1524         debug_file = debugfs_create_file(heap->name, 0664,
1525                                         dev->heaps_debug_root, heap,
1526                                         &debug_heap_fops);
1527
1528         if (!debug_file) {
1529                 char buf[256], *path;
1530
1531                 path = dentry_path(dev->heaps_debug_root, buf, 256);
1532                 pr_err("Failed to create heap debugfs at %s/%s\n",
1533                         path, heap->name);
1534         }
1535
1536 #ifdef DEBUG_HEAP_SHRINKER
1537         if (heap->shrinker.shrink) {
1538                 char debug_name[64];
1539
1540                 snprintf(debug_name, 64, "%s_shrink", heap->name);
1541                 debug_file = debugfs_create_file(
1542                         debug_name, 0644, dev->heaps_debug_root, heap,
1543                         &debug_shrink_fops);
1544                 if (!debug_file) {
1545                         char buf[256], *path;
1546
1547                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1548                         pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
1549                                 path, debug_name);
1550                 }
1551         }
1552 #endif
1553         up_write(&dev->lock);
1554 }
1555
1556 struct ion_device *ion_device_create(long (*custom_ioctl)
1557                                      (struct ion_client *client,
1558                                       unsigned int cmd,
1559                                       unsigned long arg))
1560 {
1561         struct ion_device *idev;
1562         int ret;
1563
1564         idev = kzalloc(sizeof(struct ion_device), GFP_KERNEL);
1565         if (!idev)
1566                 return ERR_PTR(-ENOMEM);
1567
1568         idev->dev.minor = MISC_DYNAMIC_MINOR;
1569         idev->dev.name = "ion";
1570         idev->dev.fops = &ion_fops;
1571         idev->dev.parent = NULL;
1572         ret = misc_register(&idev->dev);
1573         if (ret) {
1574                 pr_err("ion: failed to register misc device.\n");
1575                 return ERR_PTR(ret);
1576         }
1577
1578         idev->debug_root = debugfs_create_dir("ion", NULL);
1579         if (!idev->debug_root) {
1580                 pr_err("ion: failed to create debugfs root directory.\n");
1581                 goto debugfs_done;
1582         }
1583         idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
1584         if (!idev->heaps_debug_root) {
1585                 pr_err("ion: failed to create debugfs heaps directory.\n");
1586                 goto debugfs_done;
1587         }
1588         idev->clients_debug_root = debugfs_create_dir("clients",
1589                                                 idev->debug_root);
1590         if (!idev->clients_debug_root)
1591                 pr_err("ion: failed to create debugfs clients directory.\n");
1592
1593 debugfs_done:
1594
1595         idev->custom_ioctl = custom_ioctl;
1596         idev->buffers = RB_ROOT;
1597         mutex_init(&idev->buffer_lock);
1598         init_rwsem(&idev->lock);
1599         plist_head_init(&idev->heaps);
1600         idev->clients = RB_ROOT;
1601         return idev;
1602 }
1603
1604 void ion_device_destroy(struct ion_device *dev)
1605 {
1606         misc_deregister(&dev->dev);
1607         debugfs_remove_recursive(dev->debug_root);
1608         /* XXX need to free the heaps and clients ? */
1609         kfree(dev);
1610 }
1611
1612 void __init ion_reserve(struct ion_platform_data *data)
1613 {
1614         int i;
1615
1616         for (i = 0; i < data->nr; i++) {
1617                 if (data->heaps[i].size == 0)
1618                         continue;
1619
1620                 if (data->heaps[i].base == 0) {
1621                         phys_addr_t paddr;
1622
1623                         paddr = memblock_alloc_base(data->heaps[i].size,
1624                                                     data->heaps[i].align,
1625                                                     MEMBLOCK_ALLOC_ANYWHERE);
1626                         if (!paddr) {
1627                                 pr_err("%s: error allocating memblock for heap %d\n",
1628                                         __func__, i);
1629                                 continue;
1630                         }
1631                         data->heaps[i].base = paddr;
1632                 } else {
1633                         int ret = memblock_reserve(data->heaps[i].base,
1634                                                data->heaps[i].size);
1635                         if (ret)
1636                                 pr_err("memblock reserve of %zx@%lx failed\n",
1637                                        data->heaps[i].size,
1638                                        data->heaps[i].base);
1639                 }
1640                 pr_info("%s: %s reserved base %lx size %zu\n", __func__,
1641                         data->heaps[i].name,
1642                         data->heaps[i].base,
1643                         data->heaps[i].size);
1644         }
1645 }