kernel/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         mutex_lock(&dev->buffer_lock);
 257         ion_buffer_add(dev, buffer);
 258         mutex_unlock(&dev->buffer_lock);
 259         return buffer;
 260
 261 err:
 262         heap->ops->unmap_dma(heap, buffer);
 263 err1:
 264         heap->ops->free(buffer);
 265 err2:
 266         kfree(buffer);
 267         return ERR_PTR(ret);
 268 }
 269
 270 void ion_buffer_destroy(struct ion_buffer *buffer)
 271 {
 272         if (WARN_ON(buffer->kmap_cnt > 0))
 273                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 274         buffer->heap->ops->unmap_dma(buffer->heap, buffer);
 275         buffer->heap->ops->free(buffer);
 276         vfree(buffer->pages);
 277         kfree(buffer);
 278 }
 279
 280 static void _ion_buffer_destroy(struct kref *kref)
 281 {
 282         struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
 283         struct ion_heap *heap = buffer->heap;
 284         struct ion_device *dev = buffer->dev;
 285
 286         mutex_lock(&dev->buffer_lock);
 287         rb_erase(&buffer->node, &dev->buffers);
 288         mutex_unlock(&dev->buffer_lock);
 289
 290         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
 291                 ion_heap_freelist_add(heap, buffer);
 292         else
 293                 ion_buffer_destroy(buffer);
 294 }
 295
 296 static void ion_buffer_get(struct ion_buffer *buffer)
 297 {
 298         kref_get(&buffer->ref);
 299 }
 300
 301 static int ion_buffer_put(struct ion_buffer *buffer)
 302 {
 303         return kref_put(&buffer->ref, _ion_buffer_destroy);
 304 }
 305
 306 static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
 307 {
 308         mutex_lock(&buffer->lock);
 309         buffer->handle_count++;
 310         mutex_unlock(&buffer->lock);
 311 }
 312
 313 static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
 314 {
 315         /*
 316          * when a buffer is removed from a handle, if it is not in
 317          * any other handles, copy the taskcomm and the pid of the
 318          * process it's being removed from into the buffer.  At this
 319          * point there will be no way to track what processes this buffer is
 320          * being used by, it only exists as a dma_buf file descriptor.
 321          * The taskcomm and pid can provide a debug hint as to where this fd
 322          * is in the system
 323          */
 324         mutex_lock(&buffer->lock);
 325         buffer->handle_count--;
 326         BUG_ON(buffer->handle_count < 0);
 327         if (!buffer->handle_count) {
 328                 struct task_struct *task;
 329
 330                 task = current->group_leader;
 331                 get_task_comm(buffer->task_comm, task);
 332                 buffer->pid = task_pid_nr(task);
 333         }
 334         mutex_unlock(&buffer->lock);
 335 }
 336
 337 static struct ion_handle *ion_handle_create(struct ion_client *client,
 338                                      struct ion_buffer *buffer)
 339 {
 340         struct ion_handle *handle;
 341
 342         handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
 343         if (!handle)
 344                 return ERR_PTR(-ENOMEM);
 345         kref_init(&handle->ref);
 346         RB_CLEAR_NODE(&handle->node);
 347         handle->client = client;
 348         ion_buffer_get(buffer);
 349         ion_buffer_add_to_handle(buffer);
 350         handle->buffer = buffer;
 351
 352         return handle;
 353 }
 354
 355 static void ion_handle_kmap_put(struct ion_handle *);
 356
 357 static void ion_handle_destroy(struct kref *kref)
 358 {
 359         struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
 360         struct ion_client *client = handle->client;
 361         struct ion_buffer *buffer = handle->buffer;
 362
 363         mutex_lock(&buffer->lock);
 364         while (handle->kmap_cnt)
 365                 ion_handle_kmap_put(handle);
 366         mutex_unlock(&buffer->lock);
 367
 368         idr_remove(&client->idr, handle->id);
 369         if (!RB_EMPTY_NODE(&handle->node))
 370                 rb_erase(&handle->node, &client->handles);
 371
 372         ion_buffer_remove_from_handle(buffer);
 373         ion_buffer_put(buffer);
 374
 375         kfree(handle);
 376 }
 377
 378 struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
 379 {
 380         return handle->buffer;
 381 }
 382
 383 static void ion_handle_get(struct ion_handle *handle)
 384 {
 385         kref_get(&handle->ref);
 386 }
 387
 388 static int ion_handle_put(struct ion_handle *handle)
 389 {
 390         struct ion_client *client = handle->client;
 391         int ret;
 392
 393         mutex_lock(&client->lock);
 394         ret = kref_put(&handle->ref, ion_handle_destroy);
 395         mutex_unlock(&client->lock);
 396
 397         return ret;
 398 }
 399
 400 static struct ion_handle *ion_handle_lookup(struct ion_client *client,
 401                                             struct ion_buffer *buffer)
 402 {
 403         struct rb_node *n = client->handles.rb_node;
 404
 405         while (n) {
 406                 struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
 407
 408                 if (buffer < entry->buffer)
 409                         n = n->rb_left;
 410                 else if (buffer > entry->buffer)
 411                         n = n->rb_right;
 412                 else
 413                         return entry;
 414         }
 415         return ERR_PTR(-EINVAL);
 416 }
 417
 418 static struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
 419                                                 int id)
 420 {
 421         struct ion_handle *handle;
 422
 423         mutex_lock(&client->lock);
 424         handle = idr_find(&client->idr, id);
 425         if (handle)
 426                 ion_handle_get(handle);
 427         mutex_unlock(&client->lock);
 428
 429         return handle ? handle : ERR_PTR(-EINVAL);
 430 }
 431
 432 static bool ion_handle_validate(struct ion_client *client,
 433                                 struct ion_handle *handle)
 434 {
 435         WARN_ON(!mutex_is_locked(&client->lock));
 436         return idr_find(&client->idr, handle->id) == handle;
 437 }
 438
 439 static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
 440 {
 441         int id;
 442         struct rb_node **p = &client->handles.rb_node;
 443         struct rb_node *parent = NULL;
 444         struct ion_handle *entry;
 445
 446         id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
 447         if (id < 0)
 448                 return id;
 449
 450         handle->id = id;
 451
 452         while (*p) {
 453                 parent = *p;
 454                 entry = rb_entry(parent, struct ion_handle, node);
 455
 456                 if (handle->buffer < entry->buffer)
 457                         p = &(*p)->rb_left;
 458                 else if (handle->buffer > entry->buffer)
 459                         p = &(*p)->rb_right;
 460                 else
 461                         WARN(1, "%s: buffer already found.", __func__);
 462         }
 463
 464         rb_link_node(&handle->node, parent, p);
 465         rb_insert_color(&handle->node, &client->handles);
 466
 467         return 0;
 468 }
 469
 470 struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
 471                              size_t align, unsigned int heap_id_mask,
 472                              unsigned int flags)
 473 {
 474         struct ion_handle *handle;
 475         struct ion_device *dev = client->dev;
 476         struct ion_buffer *buffer = NULL;
 477         struct ion_heap *heap;
 478         int ret;
 479
 480         pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
 481                  len, align, heap_id_mask, flags);
 482         /*
 483          * traverse the list of heaps available in this system in priority
 484          * order.  If the heap type is supported by the client, and matches the
 485          * request of the caller allocate from it.  Repeat until allocate has
 486          * succeeded or all heaps have been tried
 487          */
 488         len = PAGE_ALIGN(len);
 489
 490         if (!len)
 491                 return ERR_PTR(-EINVAL);
 492
 493         down_read(&dev->lock);
 494         plist_for_each_entry(heap, &dev->heaps, node) {
 495                 /* if the caller didn't specify this heap id */
 496                 if (!((1 << heap->id) & heap_id_mask))
 497                         continue;
 498                 buffer = ion_buffer_create(heap, dev, len, align, flags);
 499                 if (!IS_ERR(buffer))
 500                         break;
 501         }
 502         up_read(&dev->lock);
 503
 504         if (buffer == NULL)
 505                 return ERR_PTR(-ENODEV);
 506
 507         if (IS_ERR(buffer))
 508                 return ERR_CAST(buffer);
 509
 510         handle = ion_handle_create(client, buffer);
 511
 512         /*
 513          * ion_buffer_create will create a buffer with a ref_cnt of 1,
 514          * and ion_handle_create will take a second reference, drop one here
 515          */
 516         ion_buffer_put(buffer);
 517
 518         if (IS_ERR(handle))
 519                 return handle;
 520
 521         mutex_lock(&client->lock);
 522         ret = ion_handle_add(client, handle);
 523         mutex_unlock(&client->lock);
 524         if (ret) {
 525                 ion_handle_put(handle);
 526                 handle = ERR_PTR(ret);
 527         }
 528
 529         return handle;
 530 }
 531 EXPORT_SYMBOL(ion_alloc);
 532
 533 void ion_free(struct ion_client *client, struct ion_handle *handle)
 534 {
 535         bool valid_handle;
 536
 537         BUG_ON(client != handle->client);
 538
 539         mutex_lock(&client->lock);
 540         valid_handle = ion_handle_validate(client, handle);
 541
 542         if (!valid_handle) {
 543                 WARN(1, "%s: invalid handle passed to free.\n", __func__);
 544                 mutex_unlock(&client->lock);
 545                 return;
 546         }
 547         mutex_unlock(&client->lock);
 548         ion_handle_put(handle);
 549 }
 550 EXPORT_SYMBOL(ion_free);
 551
 552 int ion_phys(struct ion_client *client, struct ion_handle *handle,
 553              ion_phys_addr_t *addr, size_t *len)
 554 {
 555         struct ion_buffer *buffer;
 556         int ret;
 557
 558         mutex_lock(&client->lock);
 559         if (!ion_handle_validate(client, handle)) {
 560                 mutex_unlock(&client->lock);
 561                 return -EINVAL;
 562         }
 563
 564         buffer = handle->buffer;
 565
 566         if (!buffer->heap->ops->phys) {
 567                 pr_err("%s: ion_phys is not implemented by this heap (name=%s, type=%d).\n",
 568                         __func__, buffer->heap->name, buffer->heap->type);
 569                 mutex_unlock(&client->lock);
 570                 return -ENODEV;
 571         }
 572         mutex_unlock(&client->lock);
 573         ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
 574         return ret;
 575 }
 576 EXPORT_SYMBOL(ion_phys);
 577
 578 static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
 579 {
 580         void *vaddr;
 581
 582         if (buffer->kmap_cnt) {
 583                 buffer->kmap_cnt++;
 584                 return buffer->vaddr;
 585         }
 586         vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
 587         if (WARN_ONCE(vaddr == NULL,
 588                         "heap->ops->map_kernel should return ERR_PTR on error"))
 589                 return ERR_PTR(-EINVAL);
 590         if (IS_ERR(vaddr))
 591                 return vaddr;
 592         buffer->vaddr = vaddr;
 593         buffer->kmap_cnt++;
 594         return vaddr;
 595 }
 596
 597 static void *ion_handle_kmap_get(struct ion_handle *handle)
 598 {
 599         struct ion_buffer *buffer = handle->buffer;
 600         void *vaddr;
 601
 602         if (handle->kmap_cnt) {
 603                 handle->kmap_cnt++;
 604                 return buffer->vaddr;
 605         }
 606         vaddr = ion_buffer_kmap_get(buffer);
 607         if (IS_ERR(vaddr))
 608                 return vaddr;
 609         handle->kmap_cnt++;
 610         return vaddr;
 611 }
 612
 613 static void ion_buffer_kmap_put(struct ion_buffer *buffer)
 614 {
 615         buffer->kmap_cnt--;
 616         if (!buffer->kmap_cnt) {
 617                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 618                 buffer->vaddr = NULL;
 619         }
 620 }
 621
 622 static void ion_handle_kmap_put(struct ion_handle *handle)
 623 {
 624         struct ion_buffer *buffer = handle->buffer;
 625
 626         if (!handle->kmap_cnt) {
 627                 WARN(1, "%s: Double unmap detected! bailing...\n", __func__);
 628                 return;
 629         }
 630         handle->kmap_cnt--;
 631         if (!handle->kmap_cnt)
 632                 ion_buffer_kmap_put(buffer);
 633 }
 634
 635 void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
 636 {
 637         struct ion_buffer *buffer;
 638         void *vaddr;
 639
 640         mutex_lock(&client->lock);
 641         if (!ion_handle_validate(client, handle)) {
 642                 pr_err("%s: invalid handle passed to map_kernel.\n",
 643                        __func__);
 644                 mutex_unlock(&client->lock);
 645                 return ERR_PTR(-EINVAL);
 646         }
 647
 648         buffer = handle->buffer;
 649
 650         if (!handle->buffer->heap->ops->map_kernel) {
 651                 pr_err("%s: map_kernel is not implemented by this heap.\n",
 652                        __func__);
 653                 mutex_unlock(&client->lock);
 654                 return ERR_PTR(-ENODEV);
 655         }
 656
 657         mutex_lock(&buffer->lock);
 658         vaddr = ion_handle_kmap_get(handle);
 659         mutex_unlock(&buffer->lock);
 660         mutex_unlock(&client->lock);
 661         return vaddr;
 662 }
 663 EXPORT_SYMBOL(ion_map_kernel);
 664
 665 void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
 666 {
 667         struct ion_buffer *buffer;
 668
 669         mutex_lock(&client->lock);
 670         buffer = handle->buffer;
 671         mutex_lock(&buffer->lock);
 672         ion_handle_kmap_put(handle);
 673         mutex_unlock(&buffer->lock);
 674         mutex_unlock(&client->lock);
 675 }
 676 EXPORT_SYMBOL(ion_unmap_kernel);
 677
 678 static int ion_debug_client_show(struct seq_file *s, void *unused)
 679 {
 680         struct ion_client *client = s->private;
 681         struct rb_node *n;
 682         size_t sizes[ION_NUM_HEAP_IDS] = {0};
 683         const char *names[ION_NUM_HEAP_IDS] = {NULL};
 684         int i;
 685
 686         mutex_lock(&client->lock);
 687         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
 688                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 689                                                      node);
 690                 unsigned int id = handle->buffer->heap->id;
 691
 692                 if (!names[id])
 693                         names[id] = handle->buffer->heap->name;
 694                 sizes[id] += handle->buffer->size;
 695         }
 696         mutex_unlock(&client->lock);
 697
 698         seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
 699         for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
 700                 if (!names[i])
 701                         continue;
 702                 seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
 703         }
 704         return 0;
 705 }
 706
 707 static int ion_debug_client_open(struct inode *inode, struct file *file)
 708 {
 709         return single_open(file, ion_debug_client_show, inode->i_private);
 710 }
 711
 712 static const struct file_operations debug_client_fops = {
 713         .open = ion_debug_client_open,
 714         .read = seq_read,
 715         .llseek = seq_lseek,
 716         .release = single_release,
 717 };
 718
 719 static int ion_get_client_serial(const struct rb_root *root,
 720                                         const unsigned char *name)
 721 {
 722         int serial = -1;
 723         struct rb_node *node;
 724
 725         for (node = rb_first(root); node; node = rb_next(node)) {
 726                 struct ion_client *client = rb_entry(node, struct ion_client,
 727                                                 node);
 728
 729                 if (strcmp(client->name, name))
 730                         continue;
 731                 serial = max(serial, client->display_serial);
 732         }
 733         return serial + 1;
 734 }
 735
 736 struct ion_client *ion_client_create(struct ion_device *dev,
 737                                      const char *name)
 738 {
 739         struct ion_client *client;
 740         struct task_struct *task;
 741         struct rb_node **p;
 742         struct rb_node *parent = NULL;
 743         struct ion_client *entry;
 744         pid_t pid;
 745
 746         if (!name) {
 747                 pr_err("%s: Name cannot be null\n", __func__);
 748                 return ERR_PTR(-EINVAL);
 749         }
 750
 751         get_task_struct(current->group_leader);
 752         task_lock(current->group_leader);
 753         pid = task_pid_nr(current->group_leader);
 754         /*
 755          * don't bother to store task struct for kernel threads,
 756          * they can't be killed anyway
 757          */
 758         if (current->group_leader->flags & PF_KTHREAD) {
 759                 put_task_struct(current->group_leader);
 760                 task = NULL;
 761         } else {
 762                 task = current->group_leader;
 763         }
 764         task_unlock(current->group_leader);
 765
 766         client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
 767         if (!client)
 768                 goto err_put_task_struct;
 769
 770         client->dev = dev;
 771         client->handles = RB_ROOT;
 772         idr_init(&client->idr);
 773         mutex_init(&client->lock);
 774         client->task = task;
 775         client->pid = pid;
 776         client->name = kstrdup(name, GFP_KERNEL);
 777         if (!client->name)
 778                 goto err_free_client;
 779
 780         down_write(&dev->lock);
 781         client->display_serial = ion_get_client_serial(&dev->clients, name);
 782         client->display_name = kasprintf(
 783                 GFP_KERNEL, "%s-%d", name, client->display_serial);
 784         if (!client->display_name) {
 785                 up_write(&dev->lock);
 786                 goto err_free_client_name;
 787         }
 788         p = &dev->clients.rb_node;
 789         while (*p) {
 790                 parent = *p;
 791                 entry = rb_entry(parent, struct ion_client, node);
 792
 793                 if (client < entry)
 794                         p = &(*p)->rb_left;
 795                 else if (client > entry)
 796                         p = &(*p)->rb_right;
 797         }
 798         rb_link_node(&client->node, parent, p);
 799         rb_insert_color(&client->node, &dev->clients);
 800
 801         client->debug_root = debugfs_create_file(client->display_name, 0664,
 802                                                 dev->clients_debug_root,
 803                                                 client, &debug_client_fops);
 804         if (!client->debug_root) {
 805                 char buf[256], *path;
 806
 807                 path = dentry_path(dev->clients_debug_root, buf, 256);
 808                 pr_err("Failed to create client debugfs at %s/%s\n",
 809                         path, client->display_name);
 810         }
 811
 812         up_write(&dev->lock);
 813
 814         return client;
 815
 816 err_free_client_name:
 817         kfree(client->name);
 818 err_free_client:
 819         kfree(client);
 820 err_put_task_struct:
 821         if (task)
 822                 put_task_struct(current->group_leader);
 823         return ERR_PTR(-ENOMEM);
 824 }
 825 EXPORT_SYMBOL(ion_client_create);
 826
 827 void ion_client_destroy(struct ion_client *client)
 828 {
 829         struct ion_device *dev = client->dev;
 830         struct rb_node *n;
 831
 832         pr_debug("%s: %d\n", __func__, __LINE__);
 833         while ((n = rb_first(&client->handles))) {
 834                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 835                                                      node);
 836                 ion_handle_destroy(&handle->ref);
 837         }
 838
 839         idr_destroy(&client->idr);
 840
 841         down_write(&dev->lock);
 842         if (client->task)
 843                 put_task_struct(client->task);
 844         rb_erase(&client->node, &dev->clients);
 845         debugfs_remove_recursive(client->debug_root);
 846         up_write(&dev->lock);
 847
 848         kfree(client->display_name);
 849         kfree(client->name);
 850         kfree(client);
 851 }
 852 EXPORT_SYMBOL(ion_client_destroy);
 853
 854 struct sg_table *ion_sg_table(struct ion_client *client,
 855                               struct ion_handle *handle)
 856 {
 857         struct ion_buffer *buffer;
 858         struct sg_table *table;
 859
 860         mutex_lock(&client->lock);
 861         if (!ion_handle_validate(client, handle)) {
 862                 pr_err("%s: invalid handle passed to map_dma.\n",
 863                        __func__);
 864                 mutex_unlock(&client->lock);
 865                 return ERR_PTR(-EINVAL);
 866         }
 867         buffer = handle->buffer;
 868         table = buffer->sg_table;
 869         mutex_unlock(&client->lock);
 870         return table;
 871 }
 872 EXPORT_SYMBOL(ion_sg_table);
 873
 874 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 875                                        struct device *dev,
 876                                        enum dma_data_direction direction);
 877
 878 static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
 879                                         enum dma_data_direction direction)
 880 {
 881         struct dma_buf *dmabuf = attachment->dmabuf;
 882         struct ion_buffer *buffer = dmabuf->priv;
 883
 884         ion_buffer_sync_for_device(buffer, attachment->dev, direction);
 885         return buffer->sg_table;
 886 }
 887
 888 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
 889                               struct sg_table *table,
 890                               enum dma_data_direction direction)
 891 {
 892 }
 893
 894 void ion_pages_sync_for_device(struct device *dev, struct page *page,
 895                 size_t size, enum dma_data_direction dir)
 896 {
 897         struct scatterlist sg;
 898
 899         sg_init_table(&sg, 1);
 900         sg_set_page(&sg, page, size, 0);
 901         /*
 902          * This is not correct - sg_dma_address needs a dma_addr_t that is valid
 903          * for the targeted device, but this works on the currently targeted
 904          * hardware.
 905          */
 906         sg_dma_address(&sg) = page_to_phys(page);
 907         dma_sync_sg_for_device(dev, &sg, 1, dir);
 908 }
 909
 910 struct ion_vma_list {
 911         struct list_head list;
 912         struct vm_area_struct *vma;
 913 };
 914
 915 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 916                                        struct device *dev,
 917                                        enum dma_data_direction dir)
 918 {
 919         struct ion_vma_list *vma_list;
 920         int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 921         int i;
 922
 923         pr_debug("%s: syncing for device %s\n", __func__,
 924                  dev ? dev_name(dev) : "null");
 925
 926         if (!ion_buffer_fault_user_mappings(buffer))
 927                 return;
 928
 929         mutex_lock(&buffer->lock);
 930         for (i = 0; i < pages; i++) {
 931                 struct page *page = buffer->pages[i];
 932
 933                 if (ion_buffer_page_is_dirty(page))
 934                         ion_pages_sync_for_device(dev, ion_buffer_page(page),
 935                                                         PAGE_SIZE, dir);
 936
 937                 ion_buffer_page_clean(buffer->pages + i);
 938         }
 939         list_for_each_entry(vma_list, &buffer->vmas, list) {
 940                 struct vm_area_struct *vma = vma_list->vma;
 941
 942                 zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
 943                                NULL);
 944         }
 945         mutex_unlock(&buffer->lock);
 946 }
 947
 948 static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 949 {
 950         struct ion_buffer *buffer = vma->vm_private_data;
 951         unsigned long pfn;
 952         int ret;
 953
 954         mutex_lock(&buffer->lock);
 955         ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
 956         BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
 957
 958         pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
 959         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
 960         mutex_unlock(&buffer->lock);
 961         if (ret)
 962                 return VM_FAULT_ERROR;
 963
 964         return VM_FAULT_NOPAGE;
 965 }
 966
 967 static void ion_vm_open(struct vm_area_struct *vma)
 968 {
 969         struct ion_buffer *buffer = vma->vm_private_data;
 970         struct ion_vma_list *vma_list;
 971
 972         vma_list = kmalloc(sizeof(struct ion_vma_list), GFP_KERNEL);
 973         if (!vma_list)
 974                 return;
 975         vma_list->vma = vma;
 976         mutex_lock(&buffer->lock);
 977         list_add(&vma_list->list, &buffer->vmas);
 978         mutex_unlock(&buffer->lock);
 979         pr_debug("%s: adding %p\n", __func__, vma);
 980 }
 981
 982 static void ion_vm_close(struct vm_area_struct *vma)
 983 {
 984         struct ion_buffer *buffer = vma->vm_private_data;
 985         struct ion_vma_list *vma_list, *tmp;
 986
 987         pr_debug("%s\n", __func__);
 988         mutex_lock(&buffer->lock);
 989         list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
 990                 if (vma_list->vma != vma)
 991                         continue;
 992                 list_del(&vma_list->list);
 993                 kfree(vma_list);
 994                 pr_debug("%s: deleting %p\n", __func__, vma);
 995                 break;
 996         }
 997         mutex_unlock(&buffer->lock);
 998 }
 999
1000 static const struct vm_operations_struct ion_vma_ops = {
1001         .open = ion_vm_open,
1002         .close = ion_vm_close,
1003         .fault = ion_vm_fault,
1004 };
1005
1006 static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
1007 {
1008         struct ion_buffer *buffer = dmabuf->priv;
1009         int ret = 0;
1010
1011         if (!buffer->heap->ops->map_user) {
1012                 pr_err("%s: this heap does not define a method for mapping to userspace\n",
1013                         __func__);
1014                 return -EINVAL;
1015         }
1016
1017         if (ion_buffer_fault_user_mappings(buffer)) {
1018                 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
1019                                                         VM_DONTDUMP;
1020                 vma->vm_private_data = buffer;
1021                 vma->vm_ops = &ion_vma_ops;
1022                 ion_vm_open(vma);
1023                 return 0;
1024         }
1025
1026         if (!(buffer->flags & ION_FLAG_CACHED))
1027                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1028
1029         mutex_lock(&buffer->lock);
1030         /* now map it to userspace */
1031         ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
1032         mutex_unlock(&buffer->lock);
1033
1034         if (ret)
1035                 pr_err("%s: failure mapping buffer to userspace\n",
1036                        __func__);
1037
1038         return ret;
1039 }
1040
1041 static void ion_dma_buf_release(struct dma_buf *dmabuf)
1042 {
1043         struct ion_buffer *buffer = dmabuf->priv;
1044
1045         ion_buffer_put(buffer);
1046 }
1047
1048 static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
1049 {
1050         struct ion_buffer *buffer = dmabuf->priv;
1051
1052         return buffer->vaddr + offset * PAGE_SIZE;
1053 }
1054
1055 static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
1056                                void *ptr)
1057 {
1058 }
1059
1060 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
1061                                         size_t len,
1062                                         enum dma_data_direction direction)
1063 {
1064         struct ion_buffer *buffer = dmabuf->priv;
1065         void *vaddr;
1066
1067         if (!buffer->heap->ops->map_kernel) {
1068                 pr_err("%s: map kernel is not implemented by this heap.\n",
1069                        __func__);
1070                 return -ENODEV;
1071         }
1072
1073         mutex_lock(&buffer->lock);
1074         vaddr = ion_buffer_kmap_get(buffer);
1075         mutex_unlock(&buffer->lock);
1076         return PTR_ERR_OR_ZERO(vaddr);
1077 }
1078
1079 static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
1080                                        size_t len,
1081                                        enum dma_data_direction direction)
1082 {
1083         struct ion_buffer *buffer = dmabuf->priv;
1084
1085         mutex_lock(&buffer->lock);
1086         ion_buffer_kmap_put(buffer);
1087         mutex_unlock(&buffer->lock);
1088 }
1089
1090 static struct dma_buf_ops dma_buf_ops = {
1091         .map_dma_buf = ion_map_dma_buf,
1092         .unmap_dma_buf = ion_unmap_dma_buf,
1093         .mmap = ion_mmap,
1094         .release = ion_dma_buf_release,
1095         .begin_cpu_access = ion_dma_buf_begin_cpu_access,
1096         .end_cpu_access = ion_dma_buf_end_cpu_access,
1097         .kmap_atomic = ion_dma_buf_kmap,
1098         .kunmap_atomic = ion_dma_buf_kunmap,
1099         .kmap = ion_dma_buf_kmap,
1100         .kunmap = ion_dma_buf_kunmap,
1101 };
1102
1103 struct dma_buf *ion_share_dma_buf(struct ion_client *client,
1104                                                 struct ion_handle *handle)
1105 {
1106         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1107         struct ion_buffer *buffer;
1108         struct dma_buf *dmabuf;
1109         bool valid_handle;
1110
1111         mutex_lock(&client->lock);
1112         valid_handle = ion_handle_validate(client, handle);
1113         if (!valid_handle) {
1114                 WARN(1, "%s: invalid handle passed to share.\n", __func__);
1115                 mutex_unlock(&client->lock);
1116                 return ERR_PTR(-EINVAL);
1117         }
1118         buffer = handle->buffer;
1119         ion_buffer_get(buffer);
1120         mutex_unlock(&client->lock);
1121
1122         exp_info.ops = &dma_buf_ops;
1123         exp_info.size = buffer->size;
1124         exp_info.flags = O_RDWR;
1125         exp_info.priv = buffer;
1126
1127         dmabuf = dma_buf_export(&exp_info);
1128         if (IS_ERR(dmabuf)) {
1129                 ion_buffer_put(buffer);
1130                 return dmabuf;
1131         }
1132
1133         return dmabuf;
1134 }
1135 EXPORT_SYMBOL(ion_share_dma_buf);
1136
1137 int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
1138 {
1139         struct dma_buf *dmabuf;
1140         int fd;
1141
1142         dmabuf = ion_share_dma_buf(client, handle);
1143         if (IS_ERR(dmabuf))
1144                 return PTR_ERR(dmabuf);
1145
1146         fd = dma_buf_fd(dmabuf, O_CLOEXEC);
1147         if (fd < 0)
1148                 dma_buf_put(dmabuf);
1149
1150         return fd;
1151 }
1152 EXPORT_SYMBOL(ion_share_dma_buf_fd);
1153
1154 struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
1155 {
1156         struct dma_buf *dmabuf;
1157         struct ion_buffer *buffer;
1158         struct ion_handle *handle;
1159         int ret;
1160
1161         dmabuf = dma_buf_get(fd);
1162         if (IS_ERR(dmabuf))
1163                 return ERR_CAST(dmabuf);
1164         /* if this memory came from ion */
1165
1166         if (dmabuf->ops != &dma_buf_ops) {
1167                 pr_err("%s: can not import dmabuf from another exporter\n",
1168                        __func__);
1169                 dma_buf_put(dmabuf);
1170                 return ERR_PTR(-EINVAL);
1171         }
1172         buffer = dmabuf->priv;
1173
1174         mutex_lock(&client->lock);
1175         /* if a handle exists for this buffer just take a reference to it */
1176         handle = ion_handle_lookup(client, buffer);
1177         if (!IS_ERR(handle)) {
1178                 ion_handle_get(handle);
1179                 mutex_unlock(&client->lock);
1180                 goto end;
1181         }
1182
1183         handle = ion_handle_create(client, buffer);
1184         if (IS_ERR(handle)) {
1185                 mutex_unlock(&client->lock);
1186                 goto end;
1187         }
1188
1189         ret = ion_handle_add(client, handle);
1190         mutex_unlock(&client->lock);
1191         if (ret) {
1192                 ion_handle_put(handle);
1193                 handle = ERR_PTR(ret);
1194         }
1195
1196 end:
1197         dma_buf_put(dmabuf);
1198         return handle;
1199 }
1200 EXPORT_SYMBOL(ion_import_dma_buf);
1201
1202 static int ion_sync_for_device(struct ion_client *client, int fd)
1203 {
1204         struct dma_buf *dmabuf;
1205         struct ion_buffer *buffer;
1206
1207         dmabuf = dma_buf_get(fd);
1208         if (IS_ERR(dmabuf))
1209                 return PTR_ERR(dmabuf);
1210
1211         /* if this memory came from ion */
1212         if (dmabuf->ops != &dma_buf_ops) {
1213                 pr_err("%s: can not sync dmabuf from another exporter\n",
1214                        __func__);
1215                 dma_buf_put(dmabuf);
1216                 return -EINVAL;
1217         }
1218         buffer = dmabuf->priv;
1219
1220         dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
1221                                buffer->sg_table->nents, DMA_BIDIRECTIONAL);
1222         dma_buf_put(dmabuf);
1223         return 0;
1224 }
1225
1226 /* fix up the cases where the ioctl direction bits are incorrect */
1227 static unsigned int ion_ioctl_dir(unsigned int cmd)
1228 {
1229         switch (cmd) {
1230         case ION_IOC_SYNC:
1231         case ION_IOC_FREE:
1232         case ION_IOC_CUSTOM:
1233                 return _IOC_WRITE;
1234         default:
1235                 return _IOC_DIR(cmd);
1236         }
1237 }
1238
1239 static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1240 {
1241         struct ion_client *client = filp->private_data;
1242         struct ion_device *dev = client->dev;
1243         struct ion_handle *cleanup_handle = NULL;
1244         int ret = 0;
1245         unsigned int dir;
1246
1247         union {
1248                 struct ion_fd_data fd;
1249                 struct ion_allocation_data allocation;
1250                 struct ion_handle_data handle;
1251                 struct ion_custom_data custom;
1252         } data;
1253
1254         dir = ion_ioctl_dir(cmd);
1255
1256         if (_IOC_SIZE(cmd) > sizeof(data))
1257                 return -EINVAL;
1258
1259         if (dir & _IOC_WRITE)
1260                 if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
1261                         return -EFAULT;
1262
1263         switch (cmd) {
1264         case ION_IOC_ALLOC:
1265         {
1266                 struct ion_handle *handle;
1267
1268                 handle = ion_alloc(client, data.allocation.len,
1269                                                 data.allocation.align,
1270                                                 data.allocation.heap_id_mask,
1271                                                 data.allocation.flags);
1272                 if (IS_ERR(handle))
1273                         return PTR_ERR(handle);
1274
1275                 data.allocation.handle = handle->id;
1276
1277                 cleanup_handle = handle;
1278                 break;
1279         }
1280         case ION_IOC_FREE:
1281         {
1282                 struct ion_handle *handle;
1283
1284                 handle = ion_handle_get_by_id(client, data.handle.handle);
1285                 if (IS_ERR(handle))
1286                         return PTR_ERR(handle);
1287                 ion_free(client, handle);
1288                 ion_handle_put(handle);
1289                 break;
1290         }
1291         case ION_IOC_SHARE:
1292         case ION_IOC_MAP:
1293         {
1294                 struct ion_handle *handle;
1295
1296                 handle = ion_handle_get_by_id(client, data.handle.handle);
1297                 if (IS_ERR(handle))
1298                         return PTR_ERR(handle);
1299                 data.fd.fd = ion_share_dma_buf_fd(client, handle);
1300                 ion_handle_put(handle);
1301                 if (data.fd.fd < 0)
1302                         ret = data.fd.fd;
1303                 break;
1304         }
1305         case ION_IOC_IMPORT:
1306         {
1307                 struct ion_handle *handle;
1308
1309                 handle = ion_import_dma_buf(client, data.fd.fd);
1310                 if (IS_ERR(handle))
1311                         ret = PTR_ERR(handle);
1312                 else
1313                         data.handle.handle = handle->id;
1314                 break;
1315         }
1316         case ION_IOC_SYNC:
1317         {
1318                 ret = ion_sync_for_device(client, data.fd.fd);
1319                 break;
1320         }
1321         case ION_IOC_CUSTOM:
1322         {
1323                 if (!dev->custom_ioctl)
1324                         return -ENOTTY;
1325                 ret = dev->custom_ioctl(client, data.custom.cmd,
1326                                                 data.custom.arg);
1327                 break;
1328         }
1329         default:
1330                 return -ENOTTY;
1331         }
1332
1333         if (dir & _IOC_READ) {
1334                 if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
1335                         if (cleanup_handle)
1336                                 ion_free(client, cleanup_handle);
1337                         return -EFAULT;
1338                 }
1339         }
1340         return ret;
1341 }
1342
1343 static int ion_release(struct inode *inode, struct file *file)
1344 {
1345         struct ion_client *client = file->private_data;
1346
1347         pr_debug("%s: %d\n", __func__, __LINE__);
1348         ion_client_destroy(client);
1349         return 0;
1350 }
1351
1352 static int ion_open(struct inode *inode, struct file *file)
1353 {
1354         struct miscdevice *miscdev = file->private_data;
1355         struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
1356         struct ion_client *client;
1357         char debug_name[64];
1358
1359         pr_debug("%s: %d\n", __func__, __LINE__);
1360         snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
1361         client = ion_client_create(dev, debug_name);
1362         if (IS_ERR(client))
1363                 return PTR_ERR(client);
1364         file->private_data = client;
1365
1366         return 0;
1367 }
1368
1369 static const struct file_operations ion_fops = {
1370         .owner          = THIS_MODULE,
1371         .open           = ion_open,
1372         .release        = ion_release,
1373         .unlocked_ioctl = ion_ioctl,
1374         .compat_ioctl   = compat_ion_ioctl,
1375 };
1376
1377 static size_t ion_debug_heap_total(struct ion_client *client,
1378                                    unsigned int id)
1379 {
1380         size_t size = 0;
1381         struct rb_node *n;
1382
1383         mutex_lock(&client->lock);
1384         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1385                 struct ion_handle *handle = rb_entry(n,
1386                                                      struct ion_handle,
1387                                                      node);
1388                 if (handle->buffer->heap->id == id)
1389                         size += handle->buffer->size;
1390         }
1391         mutex_unlock(&client->lock);
1392         return size;
1393 }
1394
1395 static int ion_debug_heap_show(struct seq_file *s, void *unused)
1396 {
1397         struct ion_heap *heap = s->private;
1398         struct ion_device *dev = heap->dev;
1399         struct rb_node *n;
1400         size_t total_size = 0;
1401         size_t total_orphaned_size = 0;
1402
1403         seq_printf(s, "%16s %16s %16s\n", "client", "pid", "size");
1404         seq_puts(s, "----------------------------------------------------\n");
1405
1406         for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
1407                 struct ion_client *client = rb_entry(n, struct ion_client,
1408                                                      node);
1409                 size_t size = ion_debug_heap_total(client, heap->id);
1410
1411                 if (!size)
1412                         continue;
1413                 if (client->task) {
1414                         char task_comm[TASK_COMM_LEN];
1415
1416                         get_task_comm(task_comm, client->task);
1417                         seq_printf(s, "%16s %16u %16zu\n", task_comm,
1418                                    client->pid, size);
1419                 } else {
1420                         seq_printf(s, "%16s %16u %16zu\n", client->name,
1421                                    client->pid, size);
1422                 }
1423         }
1424         seq_puts(s, "----------------------------------------------------\n");
1425         seq_puts(s, "orphaned allocations (info is from last known client):\n");
1426         mutex_lock(&dev->buffer_lock);
1427         for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
1428                 struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
1429                                                      node);
1430                 if (buffer->heap->id != heap->id)
1431                         continue;
1432                 total_size += buffer->size;
1433                 if (!buffer->handle_count) {
1434                         seq_printf(s, "%16s %16u %16zu %d %d\n",
1435                                    buffer->task_comm, buffer->pid,
1436                                    buffer->size, buffer->kmap_cnt,
1437                                    atomic_read(&buffer->ref.refcount));
1438                         total_orphaned_size += buffer->size;
1439                 }
1440         }
1441         mutex_unlock(&dev->buffer_lock);
1442         seq_puts(s, "----------------------------------------------------\n");
1443         seq_printf(s, "%16s %16zu\n", "total orphaned",
1444                    total_orphaned_size);
1445         seq_printf(s, "%16s %16zu\n", "total ", total_size);
1446         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1447                 seq_printf(s, "%16s %16zu\n", "deferred free",
1448                                 heap->free_list_size);
1449         seq_puts(s, "----------------------------------------------------\n");
1450
1451         if (heap->debug_show)
1452                 heap->debug_show(heap, s, unused);
1453
1454         return 0;
1455 }
1456
1457 static int ion_debug_heap_open(struct inode *inode, struct file *file)
1458 {
1459         return single_open(file, ion_debug_heap_show, inode->i_private);
1460 }
1461
1462 static const struct file_operations debug_heap_fops = {
1463         .open = ion_debug_heap_open,
1464         .read = seq_read,
1465         .llseek = seq_lseek,
1466         .release = single_release,
1467 };
1468
1469 static int debug_shrink_set(void *data, u64 val)
1470 {
1471         struct ion_heap *heap = data;
1472         struct shrink_control sc;
1473         int objs;
1474
1475         sc.gfp_mask = -1;
1476         sc.nr_to_scan = val;
1477
1478         if (!val) {
1479                 objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1480                 sc.nr_to_scan = objs;
1481         }
1482
1483         heap->shrinker.scan_objects(&heap->shrinker, &sc);
1484         return 0;
1485 }
1486
1487 static int debug_shrink_get(void *data, u64 *val)
1488 {
1489         struct ion_heap *heap = data;
1490         struct shrink_control sc;
1491         int objs;
1492
1493         sc.gfp_mask = -1;
1494         sc.nr_to_scan = 0;
1495
1496         objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1497         *val = objs;
1498         return 0;
1499 }
1500
1501 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
1502                         debug_shrink_set, "%llu\n");
1503
1504 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
1505 {
1506         struct dentry *debug_file;
1507
1508         if (!heap->ops->allocate || !heap->ops->free || !heap->ops->map_dma ||
1509             !heap->ops->unmap_dma)
1510                 pr_err("%s: can not add heap with invalid ops struct.\n",
1511                        __func__);
1512
1513         spin_lock_init(&heap->free_lock);
1514         heap->free_list_size = 0;
1515
1516         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1517                 ion_heap_init_deferred_free(heap);
1518
1519         if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
1520                 ion_heap_init_shrinker(heap);
1521
1522         heap->dev = dev;
1523         down_write(&dev->lock);
1524         /*
1525          * use negative heap->id to reverse the priority -- when traversing
1526          * the list later attempt higher id numbers first
1527          */
1528         plist_node_init(&heap->node, -heap->id);
1529         plist_add(&heap->node, &dev->heaps);
1530         debug_file = debugfs_create_file(heap->name, 0664,
1531                                         dev->heaps_debug_root, heap,
1532                                         &debug_heap_fops);
1533
1534         if (!debug_file) {
1535                 char buf[256], *path;
1536
1537                 path = dentry_path(dev->heaps_debug_root, buf, 256);
1538                 pr_err("Failed to create heap debugfs at %s/%s\n",
1539                         path, heap->name);
1540         }
1541
1542         if (heap->shrinker.count_objects && heap->shrinker.scan_objects) {
1543                 char debug_name[64];
1544
1545                 snprintf(debug_name, 64, "%s_shrink", heap->name);
1546                 debug_file = debugfs_create_file(
1547                         debug_name, 0644, dev->heaps_debug_root, heap,
1548                         &debug_shrink_fops);
1549                 if (!debug_file) {
1550                         char buf[256], *path;
1551
1552                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1553                         pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
1554                                 path, debug_name);
1555                 }
1556         }
1557
1558         up_write(&dev->lock);
1559 }
1560 EXPORT_SYMBOL(ion_device_add_heap);
1561
1562 struct ion_device *ion_device_create(long (*custom_ioctl)
1563                                      (struct ion_client *client,
1564                                       unsigned int cmd,
1565                                       unsigned long arg))
1566 {
1567         struct ion_device *idev;
1568         int ret;
1569
1570         idev = kzalloc(sizeof(struct ion_device), GFP_KERNEL);
1571         if (!idev)
1572                 return ERR_PTR(-ENOMEM);
1573
1574         idev->dev.minor = MISC_DYNAMIC_MINOR;
1575         idev->dev.name = "ion";
1576         idev->dev.fops = &ion_fops;
1577         idev->dev.parent = NULL;
1578         ret = misc_register(&idev->dev);
1579         if (ret) {
1580                 pr_err("ion: failed to register misc device.\n");
1581                 kfree(idev);
1582                 return ERR_PTR(ret);
1583         }
1584
1585         idev->debug_root = debugfs_create_dir("ion", NULL);
1586         if (!idev->debug_root) {
1587                 pr_err("ion: failed to create debugfs root directory.\n");
1588                 goto debugfs_done;
1589         }
1590         idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
1591         if (!idev->heaps_debug_root) {
1592                 pr_err("ion: failed to create debugfs heaps directory.\n");
1593                 goto debugfs_done;
1594         }
1595         idev->clients_debug_root = debugfs_create_dir("clients",
1596                                                 idev->debug_root);
1597         if (!idev->clients_debug_root)
1598                 pr_err("ion: failed to create debugfs clients directory.\n");
1599
1600 debugfs_done:
1601
1602         idev->custom_ioctl = custom_ioctl;
1603         idev->buffers = RB_ROOT;
1604         mutex_init(&idev->buffer_lock);
1605         init_rwsem(&idev->lock);
1606         plist_head_init(&idev->heaps);
1607         idev->clients = RB_ROOT;
1608         return idev;
1609 }
1610 EXPORT_SYMBOL(ion_device_create);
1611
1612 void ion_device_destroy(struct ion_device *dev)
1613 {
1614         misc_deregister(&dev->dev);
1615         debugfs_remove_recursive(dev->debug_root);
1616         /* XXX need to free the heaps and clients ? */
1617         kfree(dev);
1618 }
1619 EXPORT_SYMBOL(ion_device_destroy);
1620
1621 void __init ion_reserve(struct ion_platform_data *data)
1622 {
1623         int i;
1624
1625         for (i = 0; i < data->nr; i++) {
1626                 if (data->heaps[i].size == 0)
1627                         continue;
1628
1629                 if (data->heaps[i].base == 0) {
1630                         phys_addr_t paddr;
1631
1632                         paddr = memblock_alloc_base(data->heaps[i].size,
1633                                                     data->heaps[i].align,
1634                                                     MEMBLOCK_ALLOC_ANYWHERE);
1635                         if (!paddr) {
1636                                 pr_err("%s: error allocating memblock for heap %d\n",
1637                                         __func__, i);
1638                                 continue;
1639                         }
1640                         data->heaps[i].base = paddr;
1641                 } else {
1642                         int ret = memblock_reserve(data->heaps[i].base,
1643                                                data->heaps[i].size);
1644                         if (ret)
1645                                 pr_err("memblock reserve of %zx@%lx failed\n",
1646                                        data->heaps[i].size,
1647                                        data->heaps[i].base);
1648                 }
1649                 pr_info("%s: %s reserved base %lx size %zu\n", __func__,
1650                         data->heaps[i].name,
1651                         data->heaps[i].base,
1652                         data->heaps[i].size);
1653         }
1654 }