drivers/staging/android/ion/ion.c

   1 /*
   2
   3  * drivers/gpu/ion/ion.c
   4  *
   5  * Copyright (C) 2011 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/file.h>
  20 #include <linux/freezer.h>
  21 #include <linux/fs.h>
  22 #include <linux/anon_inodes.h>
  23 #include <linux/kthread.h>
  24 #include <linux/list.h>
  25 #include <linux/memblock.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/export.h>
  28 #include <linux/mm.h>
  29 #include <linux/mm_types.h>
  30 #include <linux/rbtree.h>
  31 #include <linux/slab.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/debugfs.h>
  36 #include <linux/dma-buf.h>
  37 #include <linux/idr.h>
  38 #include <linux/rockchip_ion.h>
  39 #include <linux/dma-contiguous.h>
  40
  41 #include "ion.h"
  42 #include "ion_priv.h"
  43 #include "compat_ion.h"
  44
  45 #define CREATE_TRACE_POINTS
  46 #include "../trace/ion.h"
  47
  48 /**
  49  * struct ion_device - the metadata of the ion device node
  50  * @dev:                the actual misc device
  51  * @buffers:            an rb tree of all the existing buffers
  52  * @buffer_lock:        lock protecting the tree of buffers
  53  * @lock:               rwsem protecting the tree of heaps and clients
  54  * @heaps:              list of all the heaps in the system
  55  * @user_clients:       list of all the clients created from userspace
  56  */
  57 struct ion_device {
  58         struct miscdevice dev;
  59         struct rb_root buffers;
  60         struct mutex buffer_lock;
  61         struct rw_semaphore lock;
  62         struct plist_head heaps;
  63         long (*custom_ioctl) (struct ion_client *client, unsigned int cmd,
  64                               unsigned long arg);
  65         struct rb_root clients;
  66         struct dentry *debug_root;
  67         struct dentry *heaps_debug_root;
  68         struct dentry *clients_debug_root;
  69 };
  70
  71 /**
  72  * struct ion_client - a process/hw block local address space
  73  * @node:               node in the tree of all clients
  74  * @dev:                backpointer to ion device
  75  * @handles:            an rb tree of all the handles in this client
  76  * @idr:                an idr space for allocating handle ids
  77  * @lock:               lock protecting the tree of handles
  78  * @name:               used for debugging
  79  * @display_name:       used for debugging (unique version of @name)
  80  * @display_serial:     used for debugging (to make display_name unique)
  81  * @task:               used for debugging
  82  *
  83  * A client represents a list of buffers this client may access.
  84  * The mutex stored here is used to protect both handles tree
  85  * as well as the handles themselves, and should be held while modifying either.
  86  */
  87 struct ion_client {
  88         struct rb_node node;
  89         struct ion_device *dev;
  90         struct rb_root handles;
  91         struct idr idr;
  92         struct mutex lock;
  93         const char *name;
  94         char *display_name;
  95         int display_serial;
  96         struct task_struct *task;
  97         pid_t pid;
  98         struct dentry *debug_root;
  99 };
 100
 101 /**
 102  * ion_handle - a client local reference to a buffer
 103  * @ref:                reference count
 104  * @client:             back pointer to the client the buffer resides in
 105  * @buffer:             pointer to the buffer
 106  * @node:               node in the client's handle rbtree
 107  * @kmap_cnt:           count of times this client has mapped to kernel
 108  * @id:                 client-unique id allocated by client->idr
 109  *
 110  * Modifications to node, map_cnt or mapping should be protected by the
 111  * lock in the client.  Other fields are never changed after initialization.
 112  */
 113 struct ion_handle {
 114         struct kref ref;
 115         struct ion_client *client;
 116         struct ion_buffer *buffer;
 117         struct rb_node node;
 118         unsigned int kmap_cnt;
 119         int id;
 120 };
 121
 122 #ifdef CONFIG_ROCKCHIP_IOMMU
 123 static void ion_iommu_force_unmap(struct ion_buffer *buffer);
 124 #endif
 125 #ifdef CONFIG_ION_ROCKCHIP_SNAPSHOT
 126 extern char *rockchip_ion_snapshot_get(unsigned *size);
 127 extern int rockchip_ion_snapshot_debugfs(struct dentry* root);
 128 static int ion_snapshot_save(struct ion_device *idev, size_t len);
 129 #endif
 130
 131 bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
 132 {
 133         return (buffer->flags & ION_FLAG_CACHED) &&
 134                 !(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
 135 }
 136
 137 bool ion_buffer_cached(struct ion_buffer *buffer)
 138 {
 139         return !!(buffer->flags & ION_FLAG_CACHED);
 140 }
 141
 142 static inline struct page *ion_buffer_page(struct page *page)
 143 {
 144         return (struct page *)((unsigned long)page & ~(1UL));
 145 }
 146
 147 static inline bool ion_buffer_page_is_dirty(struct page *page)
 148 {
 149         return !!((unsigned long)page & 1UL);
 150 }
 151
 152 static inline void ion_buffer_page_dirty(struct page **page)
 153 {
 154         *page = (struct page *)((unsigned long)(*page) | 1UL);
 155 }
 156
 157 static inline void ion_buffer_page_clean(struct page **page)
 158 {
 159         *page = (struct page *)((unsigned long)(*page) & ~(1UL));
 160 }
 161
 162 /* this function should only be called while dev->lock is held */
 163 static void ion_buffer_add(struct ion_device *dev,
 164                            struct ion_buffer *buffer)
 165 {
 166         struct rb_node **p = &dev->buffers.rb_node;
 167         struct rb_node *parent = NULL;
 168         struct ion_buffer *entry;
 169
 170         while (*p) {
 171                 parent = *p;
 172                 entry = rb_entry(parent, struct ion_buffer, node);
 173
 174                 if (buffer < entry) {
 175                         p = &(*p)->rb_left;
 176                 } else if (buffer > entry) {
 177                         p = &(*p)->rb_right;
 178                 } else {
 179                         pr_err("%s: buffer already found.", __func__);
 180                         BUG();
 181                 }
 182         }
 183
 184         rb_link_node(&buffer->node, parent, p);
 185         rb_insert_color(&buffer->node, &dev->buffers);
 186 }
 187
 188 /* this function should only be called while dev->lock is held */
 189 static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 190                                      struct ion_device *dev,
 191                                      unsigned long len,
 192                                      unsigned long align,
 193                                      unsigned long flags)
 194 {
 195         struct ion_buffer *buffer;
 196         struct sg_table *table;
 197         struct scatterlist *sg;
 198         int i, ret;
 199
 200         buffer = kzalloc(sizeof(struct ion_buffer), GFP_KERNEL);
 201         if (!buffer)
 202                 return ERR_PTR(-ENOMEM);
 203
 204         buffer->heap = heap;
 205         buffer->flags = flags;
 206         kref_init(&buffer->ref);
 207
 208         ret = heap->ops->allocate(heap, buffer, len, align, flags);
 209
 210         if (ret) {
 211                 if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
 212                         goto err2;
 213
 214                 ion_heap_freelist_drain(heap, 0);
 215                 ret = heap->ops->allocate(heap, buffer, len, align,
 216                                           flags);
 217                 if (ret)
 218                         goto err2;
 219         }
 220
 221         buffer->dev = dev;
 222         buffer->size = len;
 223
 224         table = heap->ops->map_dma(heap, buffer);
 225         if (WARN_ONCE(table == NULL,
 226                         "heap->ops->map_dma should return ERR_PTR on error"))
 227                 table = ERR_PTR(-EINVAL);
 228         if (IS_ERR(table)) {
 229                 heap->ops->free(buffer);
 230                 kfree(buffer);
 231                 return ERR_PTR(PTR_ERR(table));
 232         }
 233         buffer->sg_table = table;
 234         if (ion_buffer_fault_user_mappings(buffer)) {
 235                 int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 236                 struct scatterlist *sg;
 237                 int i, j, k = 0;
 238
 239                 buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
 240                 if (!buffer->pages) {
 241                         ret = -ENOMEM;
 242                         goto err1;
 243                 }
 244
 245                 for_each_sg(table->sgl, sg, table->nents, i) {
 246                         struct page *page = sg_page(sg);
 247
 248                         for (j = 0; j < sg->length / PAGE_SIZE; j++)
 249                                 buffer->pages[k++] = page++;
 250                 }
 251
 252                 if (ret)
 253                         goto err;
 254         }
 255
 256         buffer->dev = dev;
 257         buffer->size = len;
 258         INIT_LIST_HEAD(&buffer->vmas);
 259         mutex_init(&buffer->lock);
 260         /* this will set up dma addresses for the sglist -- it is not
 261            technically correct as per the dma api -- a specific
 262            device isn't really taking ownership here.  However, in practice on
 263            our systems the only dma_address space is physical addresses.
 264            Additionally, we can't afford the overhead of invalidating every
 265            allocation via dma_map_sg. The implicit contract here is that
 266            memory comming from the heaps is ready for dma, ie if it has a
 267            cached mapping that mapping has been invalidated */
 268         for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i)
 269                 sg_dma_address(sg) = sg_phys(sg);
 270         mutex_lock(&dev->buffer_lock);
 271         ion_buffer_add(dev, buffer);
 272         mutex_unlock(&dev->buffer_lock);
 273         return buffer;
 274
 275 err:
 276         heap->ops->unmap_dma(heap, buffer);
 277         heap->ops->free(buffer);
 278 err1:
 279         if (buffer->pages)
 280                 vfree(buffer->pages);
 281 err2:
 282         kfree(buffer);
 283         return ERR_PTR(ret);
 284 }
 285
 286 void ion_buffer_destroy(struct ion_buffer *buffer)
 287 {
 288         trace_ion_buffer_destroy("", (unsigned int)buffer, buffer->size);
 289
 290         if (WARN_ON(buffer->kmap_cnt > 0))
 291                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 292         buffer->heap->ops->unmap_dma(buffer->heap, buffer);
 293 #ifdef CONFIG_ROCKCHIP_IOMMU
 294         ion_iommu_force_unmap(buffer);
 295 #endif
 296         buffer->heap->ops->free(buffer);
 297         if (buffer->pages)
 298                 vfree(buffer->pages);
 299         kfree(buffer);
 300 }
 301
 302 static void _ion_buffer_destroy(struct kref *kref)
 303 {
 304         struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
 305         struct ion_heap *heap = buffer->heap;
 306         struct ion_device *dev = buffer->dev;
 307
 308         mutex_lock(&dev->buffer_lock);
 309         rb_erase(&buffer->node, &dev->buffers);
 310         mutex_unlock(&dev->buffer_lock);
 311
 312         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
 313                 ion_heap_freelist_add(heap, buffer);
 314         else
 315                 ion_buffer_destroy(buffer);
 316 }
 317
 318 static void ion_buffer_get(struct ion_buffer *buffer)
 319 {
 320         kref_get(&buffer->ref);
 321 }
 322
 323 static int ion_buffer_put(struct ion_buffer *buffer)
 324 {
 325         return kref_put(&buffer->ref, _ion_buffer_destroy);
 326 }
 327
 328 static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
 329 {
 330         mutex_lock(&buffer->lock);
 331         buffer->handle_count++;
 332         mutex_unlock(&buffer->lock);
 333 }
 334
 335 static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
 336 {
 337         /*
 338          * when a buffer is removed from a handle, if it is not in
 339          * any other handles, copy the taskcomm and the pid of the
 340          * process it's being removed from into the buffer.  At this
 341          * point there will be no way to track what processes this buffer is
 342          * being used by, it only exists as a dma_buf file descriptor.
 343          * The taskcomm and pid can provide a debug hint as to where this fd
 344          * is in the system
 345          */
 346         mutex_lock(&buffer->lock);
 347         buffer->handle_count--;
 348         BUG_ON(buffer->handle_count < 0);
 349         if (!buffer->handle_count) {
 350                 struct task_struct *task;
 351
 352                 task = current->group_leader;
 353                 get_task_comm(buffer->task_comm, task);
 354                 buffer->pid = task_pid_nr(task);
 355         }
 356         mutex_unlock(&buffer->lock);
 357 }
 358
 359 static struct ion_handle *ion_handle_create(struct ion_client *client,
 360                                      struct ion_buffer *buffer)
 361 {
 362         struct ion_handle *handle;
 363
 364         handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
 365         if (!handle)
 366                 return ERR_PTR(-ENOMEM);
 367         kref_init(&handle->ref);
 368         RB_CLEAR_NODE(&handle->node);
 369         handle->client = client;
 370         ion_buffer_get(buffer);
 371         ion_buffer_add_to_handle(buffer);
 372         handle->buffer = buffer;
 373
 374         return handle;
 375 }
 376
 377 static void ion_handle_kmap_put(struct ion_handle *);
 378
 379 static void ion_handle_destroy(struct kref *kref)
 380 {
 381         struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
 382         struct ion_client *client = handle->client;
 383         struct ion_buffer *buffer = handle->buffer;
 384
 385         mutex_lock(&buffer->lock);
 386         while (handle->kmap_cnt)
 387                 ion_handle_kmap_put(handle);
 388         mutex_unlock(&buffer->lock);
 389
 390         idr_remove(&client->idr, handle->id);
 391         if (!RB_EMPTY_NODE(&handle->node))
 392                 rb_erase(&handle->node, &client->handles);
 393
 394         ion_buffer_remove_from_handle(buffer);
 395         ion_buffer_put(buffer);
 396
 397         kfree(handle);
 398 }
 399
 400 struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
 401 {
 402         return handle->buffer;
 403 }
 404
 405 static void ion_handle_get(struct ion_handle *handle)
 406 {
 407         kref_get(&handle->ref);
 408 }
 409
 410 int ion_handle_put(struct ion_handle *handle)
 411 {
 412         struct ion_client *client = handle->client;
 413         int ret;
 414
 415         mutex_lock(&client->lock);
 416         ret = kref_put(&handle->ref, ion_handle_destroy);
 417         mutex_unlock(&client->lock);
 418
 419         return ret;
 420 }
 421
 422 static struct ion_handle *ion_handle_lookup(struct ion_client *client,
 423                                             struct ion_buffer *buffer)
 424 {
 425         struct rb_node *n = client->handles.rb_node;
 426
 427         while (n) {
 428                 struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
 429                 if (buffer < entry->buffer)
 430                         n = n->rb_left;
 431                 else if (buffer > entry->buffer)
 432                         n = n->rb_right;
 433                 else
 434                         return entry;
 435         }
 436         return ERR_PTR(-EINVAL);
 437 }
 438
 439 struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
 440                                                 int id)
 441 {
 442         struct ion_handle *handle;
 443
 444         mutex_lock(&client->lock);
 445         handle = idr_find(&client->idr, id);
 446         if (handle)
 447                 ion_handle_get(handle);
 448         mutex_unlock(&client->lock);
 449
 450         return handle ? handle : ERR_PTR(-EINVAL);
 451 }
 452
 453 static bool ion_handle_validate(struct ion_client *client,
 454                                 struct ion_handle *handle)
 455 {
 456         WARN_ON(!mutex_is_locked(&client->lock));
 457         return (idr_find(&client->idr, handle->id) == handle);
 458 }
 459
 460 static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
 461 {
 462         int id;
 463         struct rb_node **p = &client->handles.rb_node;
 464         struct rb_node *parent = NULL;
 465         struct ion_handle *entry;
 466
 467         id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
 468         if (id < 0)
 469                 return id;
 470
 471         handle->id = id;
 472
 473         while (*p) {
 474                 parent = *p;
 475                 entry = rb_entry(parent, struct ion_handle, node);
 476
 477                 if (handle->buffer < entry->buffer)
 478                         p = &(*p)->rb_left;
 479                 else if (handle->buffer > entry->buffer)
 480                         p = &(*p)->rb_right;
 481                 else
 482                         WARN(1, "%s: buffer already found.", __func__);
 483         }
 484
 485         rb_link_node(&handle->node, parent, p);
 486         rb_insert_color(&handle->node, &client->handles);
 487
 488         return 0;
 489 }
 490
 491 struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
 492                              size_t align, unsigned int heap_id_mask,
 493                              unsigned int flags)
 494 {
 495         struct ion_handle *handle;
 496         struct ion_device *dev = client->dev;
 497         struct ion_buffer *buffer = NULL;
 498         struct ion_heap *heap;
 499         int ret;
 500
 501         pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
 502                  len, align, heap_id_mask, flags);
 503         /*
 504          * traverse the list of heaps available in this system in priority
 505          * order.  If the heap type is supported by the client, and matches the
 506          * request of the caller allocate from it.  Repeat until allocate has
 507          * succeeded or all heaps have been tried
 508          */
 509         len = PAGE_ALIGN(len);
 510
 511         if (!len)
 512                 return ERR_PTR(-EINVAL);
 513
 514         down_read(&dev->lock);
 515         plist_for_each_entry(heap, &dev->heaps, node) {
 516                 /* if the caller didn't specify this heap id */
 517                 if (!((1 << heap->id) & heap_id_mask))
 518                         continue;
 519                 buffer = ion_buffer_create(heap, dev, len, align, flags);
 520                 if (!IS_ERR(buffer))
 521                         break;
 522         }
 523         up_read(&dev->lock);
 524
 525         if (buffer == NULL)
 526                 return ERR_PTR(-ENODEV);
 527
 528         if (IS_ERR(buffer)) {
 529 #ifdef CONFIG_ION_ROCKCHIP_SNAPSHOT
 530                 ion_snapshot_save(client->dev, len);
 531 #endif
 532                 return ERR_PTR(PTR_ERR(buffer));
 533         }
 534
 535         handle = ion_handle_create(client, buffer);
 536
 537         /*
 538          * ion_buffer_create will create a buffer with a ref_cnt of 1,
 539          * and ion_handle_create will take a second reference, drop one here
 540          */
 541         ion_buffer_put(buffer);
 542
 543         if (IS_ERR(handle))
 544                 return handle;
 545
 546         mutex_lock(&client->lock);
 547         ret = ion_handle_add(client, handle);
 548         mutex_unlock(&client->lock);
 549         if (ret) {
 550                 ion_handle_put(handle);
 551                 handle = ERR_PTR(ret);
 552         }
 553
 554         trace_ion_buffer_alloc(client->display_name, (unsigned int)buffer,
 555                 buffer->size);
 556
 557         return handle;
 558 }
 559 EXPORT_SYMBOL(ion_alloc);
 560
 561 void ion_free(struct ion_client *client, struct ion_handle *handle)
 562 {
 563         bool valid_handle;
 564
 565         BUG_ON(client != handle->client);
 566
 567         mutex_lock(&client->lock);
 568         valid_handle = ion_handle_validate(client, handle);
 569
 570         if (!valid_handle) {
 571                 WARN(1, "%s: invalid handle passed to free.\n", __func__);
 572                 mutex_unlock(&client->lock);
 573                 return;
 574         }
 575         mutex_unlock(&client->lock);
 576         trace_ion_buffer_free(client->display_name, (unsigned int)handle->buffer,
 577                         handle->buffer->size);
 578         ion_handle_put(handle);
 579 }
 580 EXPORT_SYMBOL(ion_free);
 581
 582 int ion_phys(struct ion_client *client, struct ion_handle *handle,
 583              ion_phys_addr_t *addr, size_t *len)
 584 {
 585         struct ion_buffer *buffer;
 586         int ret;
 587
 588         mutex_lock(&client->lock);
 589         if (!ion_handle_validate(client, handle)) {
 590                 mutex_unlock(&client->lock);
 591                 return -EINVAL;
 592         }
 593
 594         buffer = handle->buffer;
 595
 596         if (!buffer->heap->ops->phys) {
 597                 pr_err("%s: ion_phys is not implemented by this heap.\n",
 598                        __func__);
 599                 mutex_unlock(&client->lock);
 600                 return -ENODEV;
 601         }
 602         mutex_unlock(&client->lock);
 603         ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
 604         return ret;
 605 }
 606 EXPORT_SYMBOL(ion_phys);
 607
 608 static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
 609 {
 610         void *vaddr;
 611
 612         if (buffer->kmap_cnt) {
 613                 buffer->kmap_cnt++;
 614                 return buffer->vaddr;
 615         }
 616         vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
 617         if (WARN_ONCE(vaddr == NULL,
 618                         "heap->ops->map_kernel should return ERR_PTR on error"))
 619                 return ERR_PTR(-EINVAL);
 620         if (IS_ERR(vaddr))
 621                 return vaddr;
 622         buffer->vaddr = vaddr;
 623         buffer->kmap_cnt++;
 624         return vaddr;
 625 }
 626
 627 static void *ion_handle_kmap_get(struct ion_handle *handle)
 628 {
 629         struct ion_buffer *buffer = handle->buffer;
 630         void *vaddr;
 631
 632         if (handle->kmap_cnt) {
 633                 handle->kmap_cnt++;
 634                 return buffer->vaddr;
 635         }
 636         vaddr = ion_buffer_kmap_get(buffer);
 637         if (IS_ERR(vaddr))
 638                 return vaddr;
 639         handle->kmap_cnt++;
 640         return vaddr;
 641 }
 642
 643 static void ion_buffer_kmap_put(struct ion_buffer *buffer)
 644 {
 645         buffer->kmap_cnt--;
 646         if (!buffer->kmap_cnt) {
 647                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 648                 buffer->vaddr = NULL;
 649         }
 650 }
 651
 652 static void ion_handle_kmap_put(struct ion_handle *handle)
 653 {
 654         struct ion_buffer *buffer = handle->buffer;
 655
 656         handle->kmap_cnt--;
 657         if (!handle->kmap_cnt)
 658                 ion_buffer_kmap_put(buffer);
 659 }
 660
 661 void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
 662 {
 663         struct ion_buffer *buffer;
 664         void *vaddr;
 665
 666         mutex_lock(&client->lock);
 667         if (!ion_handle_validate(client, handle)) {
 668                 pr_err("%s: invalid handle passed to map_kernel.\n",
 669                        __func__);
 670                 mutex_unlock(&client->lock);
 671                 return ERR_PTR(-EINVAL);
 672         }
 673
 674         buffer = handle->buffer;
 675
 676         if (!handle->buffer->heap->ops->map_kernel) {
 677                 pr_err("%s: map_kernel is not implemented by this heap.\n",
 678                        __func__);
 679                 mutex_unlock(&client->lock);
 680                 return ERR_PTR(-ENODEV);
 681         }
 682
 683         mutex_lock(&buffer->lock);
 684         vaddr = ion_handle_kmap_get(handle);
 685         mutex_unlock(&buffer->lock);
 686         mutex_unlock(&client->lock);
 687         trace_ion_kernel_map(client->display_name, (unsigned int)buffer,
 688                         buffer->size, (unsigned int)vaddr);
 689         return vaddr;
 690 }
 691 EXPORT_SYMBOL(ion_map_kernel);
 692
 693 void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
 694 {
 695         struct ion_buffer *buffer;
 696
 697         mutex_lock(&client->lock);
 698         buffer = handle->buffer;
 699         mutex_lock(&buffer->lock);
 700         trace_ion_kernel_unmap(client->display_name, (unsigned int)buffer,
 701                         buffer->size);
 702         ion_handle_kmap_put(handle);
 703         mutex_unlock(&buffer->lock);
 704         mutex_unlock(&client->lock);
 705 }
 706 EXPORT_SYMBOL(ion_unmap_kernel);
 707
 708 #ifdef CONFIG_ROCKCHIP_IOMMU
 709 static void ion_iommu_add(struct ion_buffer *buffer,
 710                           struct ion_iommu_map *iommu)
 711 {
 712         struct rb_node **p = &buffer->iommu_maps.rb_node;
 713         struct rb_node *parent = NULL;
 714         struct ion_iommu_map *entry;
 715
 716         while (*p) {
 717                 parent = *p;
 718                 entry = rb_entry(parent, struct ion_iommu_map, node);
 719
 720                 if (iommu->key < entry->key) {
 721                         p = &(*p)->rb_left;
 722                 } else if (iommu->key > entry->key) {
 723                         p = &(*p)->rb_right;
 724                 } else {
 725                         pr_err("%s: buffer %p already has mapping for domainid %x\n",
 726                                 __func__,
 727                                 buffer,
 728                                 iommu->key);
 729                         BUG();
 730                 }
 731         }
 732
 733         rb_link_node(&iommu->node, parent, p);
 734         rb_insert_color(&iommu->node, &buffer->iommu_maps);
 735 }
 736
 737 static struct ion_iommu_map *ion_iommu_lookup(struct ion_buffer *buffer,
 738                                                 uint32_t key)
 739 {
 740         struct rb_node **p = &buffer->iommu_maps.rb_node;
 741         struct rb_node *parent = NULL;
 742         struct ion_iommu_map *entry;
 743
 744         while (*p) {
 745                 parent = *p;
 746                 entry = rb_entry(parent, struct ion_iommu_map, node);
 747
 748                 if (key < entry->key)
 749                         p = &(*p)->rb_left;
 750                 else if (key > entry->key)
 751                         p = &(*p)->rb_right;
 752                 else
 753                         return entry;
 754         }
 755
 756         return NULL;
 757 }
 758
 759 static struct ion_iommu_map *__ion_iommu_map(struct ion_buffer *buffer,
 760                 struct device *iommu_dev, unsigned long *iova)
 761 {
 762         struct ion_iommu_map *data;
 763         int ret;
 764
 765         data = kmalloc(sizeof(*data), GFP_ATOMIC);
 766
 767         if (!data)
 768                 return ERR_PTR(-ENOMEM);
 769
 770         data->buffer = buffer;
 771         data->key = (uint32_t)iommu_dev;
 772
 773         ret = buffer->heap->ops->map_iommu(buffer, iommu_dev, data,
 774                                                 buffer->size, buffer->flags);
 775         if (ret)
 776                 goto out;
 777
 778         kref_init(&data->ref);
 779         *iova = data->iova_addr;
 780
 781         ion_iommu_add(buffer, data);
 782
 783         return data;
 784
 785 out:
 786         kfree(data);
 787         return ERR_PTR(ret);
 788 }
 789
 790 int ion_map_iommu(struct device *iommu_dev, struct ion_client *client,
 791                 struct ion_handle *handle, unsigned long *iova, unsigned long *size)
 792 {
 793         struct ion_buffer *buffer;
 794         struct ion_iommu_map *iommu_map;
 795         int ret = 0;
 796
 797         mutex_lock(&client->lock);
 798         if (!ion_handle_validate(client, handle)) {
 799                 pr_err("%s: invalid handle passed to map_kernel.\n",
 800                        __func__);
 801                 mutex_unlock(&client->lock);
 802                 return -EINVAL;
 803         }
 804
 805         buffer = handle->buffer;
 806         pr_debug("%s: map buffer(%p)\n", __func__, buffer);
 807
 808         mutex_lock(&buffer->lock);
 809
 810         if (ION_IS_CACHED(buffer->flags)) {
 811                 pr_err("%s: Cannot map iommu as cached.\n", __func__);
 812                 ret = -EINVAL;
 813                 goto out;
 814         }
 815
 816         if (!handle->buffer->heap->ops->map_iommu) {
 817                 pr_err("%s: map_iommu is not implemented by this heap.\n",
 818                        __func__);
 819                 ret = -ENODEV;
 820                 goto out;
 821         }
 822
 823         if (buffer->size & ~PAGE_MASK) {
 824                 pr_debug("%s: buffer size %x is not aligned to %lx", __func__,
 825                         buffer->size, PAGE_SIZE);
 826                 ret = -EINVAL;
 827                 goto out;
 828         }
 829
 830         iommu_map = ion_iommu_lookup(buffer, (uint32_t)iommu_dev);
 831         if (!iommu_map) {
 832                 pr_debug("%s: create new map for buffer(%p)\n", __func__, buffer);
 833                 iommu_map = __ion_iommu_map(buffer, iommu_dev, iova);
 834                 if (IS_ERR(iommu_map))
 835                         ret = PTR_ERR(iommu_map);
 836         } else {
 837                 pr_debug("%s: buffer(%p) already mapped\n", __func__, buffer);
 838                 if (iommu_map->mapped_size != buffer->size) {
 839                         pr_err("%s: handle %p is already mapped with length"
 840                                         " %x, trying to map with length %x\n",
 841                                 __func__, handle, iommu_map->mapped_size, buffer->size);
 842                         ret = -EINVAL;
 843                 } else {
 844                         kref_get(&iommu_map->ref);
 845                         *iova = iommu_map->iova_addr;
 846                 }
 847         }
 848         if (!ret)
 849                 buffer->iommu_map_cnt++;
 850         *size = buffer->size;
 851         trace_ion_iommu_map(client->display_name, (unsigned int)buffer, buffer->size,
 852                 dev_name(iommu_dev), *iova, *size, buffer->iommu_map_cnt);
 853 out:
 854         mutex_unlock(&buffer->lock);
 855         mutex_unlock(&client->lock);
 856         return ret;
 857 }
 858 EXPORT_SYMBOL(ion_map_iommu);
 859
 860 static void ion_iommu_release(struct kref *kref)
 861 {
 862         struct ion_iommu_map *map = container_of(kref, struct ion_iommu_map,
 863                                                 ref);
 864         struct ion_buffer *buffer = map->buffer;
 865
 866         trace_ion_iommu_release("", (unsigned int)buffer, buffer->size,
 867                 "", map->iova_addr, map->mapped_size, buffer->iommu_map_cnt);
 868
 869         rb_erase(&map->node, &buffer->iommu_maps);
 870         buffer->heap->ops->unmap_iommu((struct device*)map->key, map);
 871         kfree(map);
 872 }
 873
 874 /**
 875  * Unmap any outstanding mappings which would otherwise have been leaked.
 876  */
 877 static void ion_iommu_force_unmap(struct ion_buffer *buffer)
 878 {
 879         struct ion_iommu_map *iommu_map;
 880         struct rb_node *node;
 881         const struct rb_root *rb = &(buffer->iommu_maps);
 882
 883         pr_debug("%s: force unmap buffer(%p)\n", __func__, buffer);
 884
 885         mutex_lock(&buffer->lock);
 886
 887         while ((node = rb_first(rb)) != 0) {
 888                 iommu_map = rb_entry(node, struct ion_iommu_map, node);
 889                 /* set ref count to 1 to force release */
 890                 kref_init(&iommu_map->ref);
 891                 kref_put(&iommu_map->ref, ion_iommu_release);
 892         }
 893
 894         mutex_unlock(&buffer->lock);
 895 }
 896
 897 void ion_unmap_iommu(struct device *iommu_dev, struct ion_client *client,
 898                         struct ion_handle *handle)
 899 {
 900         struct ion_iommu_map *iommu_map;
 901         struct ion_buffer *buffer;
 902
 903         mutex_lock(&client->lock);
 904         buffer = handle->buffer;
 905         pr_debug("%s: unmap buffer(%p)\n", __func__, buffer);
 906
 907         mutex_lock(&buffer->lock);
 908
 909         iommu_map = ion_iommu_lookup(buffer, (uint32_t)iommu_dev);
 910
 911         if (!iommu_map) {
 912                 WARN(1, "%s: (%p) was never mapped for %p\n", __func__,
 913                                 iommu_dev, buffer);
 914                 goto out;
 915         }
 916
 917         kref_put(&iommu_map->ref, ion_iommu_release);
 918
 919         buffer->iommu_map_cnt--;
 920
 921         trace_ion_iommu_unmap(client->display_name, (unsigned int)buffer, buffer->size,
 922                 dev_name(iommu_dev), iommu_map->iova_addr,
 923                 iommu_map->mapped_size, buffer->iommu_map_cnt);
 924 out:
 925         mutex_unlock(&buffer->lock);
 926         mutex_unlock(&client->lock);
 927 }
 928 EXPORT_SYMBOL(ion_unmap_iommu);
 929
 930 static int ion_debug_client_show_buffer_map(struct seq_file *s, struct ion_buffer *buffer)
 931 {
 932         struct ion_iommu_map *iommu_map;
 933         const struct rb_root *rb;
 934         struct rb_node *node;
 935
 936         pr_debug("%s: buffer(%p)\n", __func__, buffer);
 937
 938         mutex_lock(&buffer->lock);
 939         rb = &(buffer->iommu_maps);
 940         node = rb_first(rb);
 941
 942         while (node != NULL) {
 943                 iommu_map = rb_entry(node, struct ion_iommu_map, node);
 944                 seq_printf(s, "%16.16s:   0x%08lx   0x%08x   0x%08x %8zuKB %4d\n",
 945                         "<iommu>", iommu_map->iova_addr, 0, 0, iommu_map->mapped_size>>10,
 946                         atomic_read(&iommu_map->ref.refcount));
 947
 948                 node = rb_next(node);
 949         }
 950
 951         mutex_unlock(&buffer->lock);
 952
 953         return 0;
 954 }
 955 #else
 956 int ion_map_iommu(struct device *iommu_dev, struct ion_client *client,
 957                 struct ion_handle *handle, unsigned long *iova, unsigned long *size)
 958 {
 959         return 0;
 960 }
 961 void ion_unmap_iommu(struct device *iommu_dev, struct ion_client *client,
 962                         struct ion_handle *handle)
 963 {
 964 }
 965 #endif
 966
 967 static int ion_debug_client_show_buffer(struct seq_file *s, void *unused)
 968 {
 969         struct ion_client *client = s->private;
 970         struct rb_node *n;
 971
 972         seq_printf(s, "----------------------------------------------------\n");
 973         seq_printf(s, "%16.s: %12.s %12.s %12.s %10.s %4.s %4.s %4.s\n",
 974                 "heap_name", "VA", "PA", "IBUF", "size", "HC", "IBR", "IHR");
 975         mutex_lock(&client->lock);
 976         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
 977                 struct ion_handle *handle = rb_entry(n, struct ion_handle, node);
 978                 struct ion_buffer *buffer = handle->buffer;
 979                 ion_phys_addr_t pa = 0;
 980                 size_t len = buffer->size;
 981
 982                 mutex_lock(&buffer->lock);
 983
 984                 if (buffer->heap->ops->phys)
 985                         buffer->heap->ops->phys(buffer->heap, buffer, &pa, &len);
 986
 987                 seq_printf(s, "%16.16s:   0x%08lx   0x%08lx   0x%08lx %8zuKB %4d %4d %4d\n",
 988                         buffer->heap->name, (unsigned long)buffer->vaddr, pa,
 989                         (unsigned long)buffer, len>>10, buffer->handle_count,
 990                         atomic_read(&buffer->ref.refcount),
 991                         atomic_read(&handle->ref.refcount));
 992
 993                 mutex_unlock(&buffer->lock);
 994
 995 #ifdef CONFIG_ROCKCHIP_IOMMU
 996                 ion_debug_client_show_buffer_map(s, buffer);
 997 #endif
 998         }
 999         mutex_unlock(&client->lock);
1000
1001         return 0;
1002 }
1003
1004 static int ion_debug_client_show(struct seq_file *s, void *unused)
1005 {
1006         struct ion_client *client = s->private;
1007         struct rb_node *n;
1008         size_t sizes[ION_NUM_HEAP_IDS] = {0};
1009         const char *names[ION_NUM_HEAP_IDS] = {NULL};
1010         int i;
1011
1012         mutex_lock(&client->lock);
1013         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1014                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
1015                                                      node);
1016                 unsigned int id = handle->buffer->heap->id;
1017
1018                 if (!names[id])
1019                         names[id] = handle->buffer->heap->name;
1020                 sizes[id] += handle->buffer->size;
1021         }
1022         mutex_unlock(&client->lock);
1023
1024         seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
1025         for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
1026                 if (!names[i])
1027                         continue;
1028                 seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
1029         }
1030         ion_debug_client_show_buffer(s, unused);
1031         return 0;
1032 }
1033
1034 static int ion_debug_client_open(struct inode *inode, struct file *file)
1035 {
1036         return single_open(file, ion_debug_client_show, inode->i_private);
1037 }
1038
1039 static const struct file_operations debug_client_fops = {
1040         .open = ion_debug_client_open,
1041         .read = seq_read,
1042         .llseek = seq_lseek,
1043         .release = single_release,
1044 };
1045
1046 static int ion_get_client_serial(const struct rb_root *root,
1047                                         const unsigned char *name)
1048 {
1049         int serial = -1;
1050         struct rb_node *node;
1051         for (node = rb_first(root); node; node = rb_next(node)) {
1052                 struct ion_client *client = rb_entry(node, struct ion_client,
1053                                                 node);
1054                 if (strcmp(client->name, name))
1055                         continue;
1056                 serial = max(serial, client->display_serial);
1057         }
1058         return serial + 1;
1059 }
1060
1061 struct ion_client *ion_client_create(struct ion_device *dev,
1062                                      const char *name)
1063 {
1064         struct ion_client *client;
1065         struct task_struct *task;
1066         struct rb_node **p;
1067         struct rb_node *parent = NULL;
1068         struct ion_client *entry;
1069         pid_t pid;
1070
1071         if (!name) {
1072                 pr_err("%s: Name cannot be null\n", __func__);
1073                 return ERR_PTR(-EINVAL);
1074         }
1075
1076         get_task_struct(current->group_leader);
1077         task_lock(current->group_leader);
1078         pid = task_pid_nr(current->group_leader);
1079         /* don't bother to store task struct for kernel threads,
1080            they can't be killed anyway */
1081         if (current->group_leader->flags & PF_KTHREAD) {
1082                 put_task_struct(current->group_leader);
1083                 task = NULL;
1084         } else {
1085                 task = current->group_leader;
1086         }
1087         task_unlock(current->group_leader);
1088
1089         client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
1090         if (!client)
1091                 goto err_put_task_struct;
1092
1093         client->dev = dev;
1094         client->handles = RB_ROOT;
1095         idr_init(&client->idr);
1096         mutex_init(&client->lock);
1097         client->task = task;
1098         client->pid = pid;
1099         client->name = kstrdup(name, GFP_KERNEL);
1100         if (!client->name)
1101                 goto err_free_client;
1102
1103         down_write(&dev->lock);
1104         client->display_serial = ion_get_client_serial(&dev->clients, name);
1105         client->display_name = kasprintf(
1106                 GFP_KERNEL, "%s-%d", name, client->display_serial);
1107         if (!client->display_name) {
1108                 up_write(&dev->lock);
1109                 goto err_free_client_name;
1110         }
1111         p = &dev->clients.rb_node;
1112         while (*p) {
1113                 parent = *p;
1114                 entry = rb_entry(parent, struct ion_client, node);
1115
1116                 if (client < entry)
1117                         p = &(*p)->rb_left;
1118                 else if (client > entry)
1119                         p = &(*p)->rb_right;
1120         }
1121         rb_link_node(&client->node, parent, p);
1122         rb_insert_color(&client->node, &dev->clients);
1123
1124         client->debug_root = debugfs_create_file(client->display_name, 0664,
1125                                                 dev->clients_debug_root,
1126                                                 client, &debug_client_fops);
1127         if (!client->debug_root) {
1128                 char buf[256], *path;
1129                 path = dentry_path(dev->clients_debug_root, buf, 256);
1130                 pr_err("Failed to create client debugfs at %s/%s\n",
1131                         path, client->display_name);
1132         }
1133
1134         trace_ion_client_create(client->display_name);
1135
1136         up_write(&dev->lock);
1137
1138         return client;
1139
1140 err_free_client_name:
1141         kfree(client->name);
1142 err_free_client:
1143         kfree(client);
1144 err_put_task_struct:
1145         if (task)
1146                 put_task_struct(current->group_leader);
1147         return ERR_PTR(-ENOMEM);
1148 }
1149 EXPORT_SYMBOL(ion_client_create);
1150
1151 void ion_client_destroy(struct ion_client *client)
1152 {
1153         struct ion_device *dev = client->dev;
1154         struct rb_node *n;
1155
1156         pr_debug("%s: %d\n", __func__, __LINE__);
1157         while ((n = rb_first(&client->handles))) {
1158                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
1159                                                      node);
1160                 ion_handle_destroy(&handle->ref);
1161         }
1162
1163         idr_destroy(&client->idr);
1164
1165         down_write(&dev->lock);
1166         if (client->task)
1167                 put_task_struct(client->task);
1168         rb_erase(&client->node, &dev->clients);
1169         debugfs_remove_recursive(client->debug_root);
1170         up_write(&dev->lock);
1171
1172         trace_ion_client_destroy(client->display_name);
1173
1174         kfree(client->display_name);
1175         kfree(client->name);
1176         kfree(client);
1177 }
1178 EXPORT_SYMBOL(ion_client_destroy);
1179
1180 struct sg_table *ion_sg_table(struct ion_client *client,
1181                               struct ion_handle *handle)
1182 {
1183         struct ion_buffer *buffer;
1184         struct sg_table *table;
1185
1186         mutex_lock(&client->lock);
1187         if (!ion_handle_validate(client, handle)) {
1188                 pr_err("%s: invalid handle passed to map_dma.\n",
1189                        __func__);
1190                 mutex_unlock(&client->lock);
1191                 return ERR_PTR(-EINVAL);
1192         }
1193         buffer = handle->buffer;
1194         table = buffer->sg_table;
1195         mutex_unlock(&client->lock);
1196         return table;
1197 }
1198 EXPORT_SYMBOL(ion_sg_table);
1199
1200 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
1201                                        struct device *dev,
1202                                        enum dma_data_direction direction);
1203
1204 static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
1205                                         enum dma_data_direction direction)
1206 {
1207         struct dma_buf *dmabuf = attachment->dmabuf;
1208         struct ion_buffer *buffer = dmabuf->priv;
1209
1210         ion_buffer_sync_for_device(buffer, attachment->dev, direction);
1211         return buffer->sg_table;
1212 }
1213
1214 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
1215                               struct sg_table *table,
1216                               enum dma_data_direction direction)
1217 {
1218 }
1219
1220 void ion_pages_sync_for_device(struct device *dev, struct page *page,
1221                 size_t size, enum dma_data_direction dir)
1222 {
1223         struct scatterlist sg;
1224
1225         sg_init_table(&sg, 1);
1226         sg_set_page(&sg, page, size, 0);
1227         /*
1228          * This is not correct - sg_dma_address needs a dma_addr_t that is valid
1229          * for the the targeted device, but this works on the currently targeted
1230          * hardware.
1231          */
1232         sg_dma_address(&sg) = page_to_phys(page);
1233         dma_sync_sg_for_device(dev, &sg, 1, dir);
1234 }
1235
1236 struct ion_vma_list {
1237         struct list_head list;
1238         struct vm_area_struct *vma;
1239 };
1240
1241 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
1242                                        struct device *dev,
1243                                        enum dma_data_direction dir)
1244 {
1245         struct ion_vma_list *vma_list;
1246         int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
1247         int i;
1248
1249         pr_debug("%s: syncing for device %s\n", __func__,
1250                  dev ? dev_name(dev) : "null");
1251
1252         if (!ion_buffer_fault_user_mappings(buffer))
1253                 return;
1254
1255         mutex_lock(&buffer->lock);
1256         for (i = 0; i < pages; i++) {
1257                 struct page *page = buffer->pages[i];
1258
1259                 if (ion_buffer_page_is_dirty(page))
1260                         ion_pages_sync_for_device(dev, ion_buffer_page(page),
1261                                                         PAGE_SIZE, dir);
1262
1263                 ion_buffer_page_clean(buffer->pages + i);
1264         }
1265         list_for_each_entry(vma_list, &buffer->vmas, list) {
1266                 struct vm_area_struct *vma = vma_list->vma;
1267
1268                 zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
1269                                NULL);
1270         }
1271         mutex_unlock(&buffer->lock);
1272 }
1273
1274 static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1275 {
1276         struct ion_buffer *buffer = vma->vm_private_data;
1277         unsigned long pfn;
1278         int ret;
1279
1280         mutex_lock(&buffer->lock);
1281         ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
1282         BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
1283
1284         pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
1285         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
1286         mutex_unlock(&buffer->lock);
1287         if (ret)
1288                 return VM_FAULT_ERROR;
1289
1290         return VM_FAULT_NOPAGE;
1291 }
1292
1293 static void ion_vm_open(struct vm_area_struct *vma)
1294 {
1295         struct ion_buffer *buffer = vma->vm_private_data;
1296         struct ion_vma_list *vma_list;
1297
1298         vma_list = kmalloc(sizeof(struct ion_vma_list), GFP_KERNEL);
1299         if (!vma_list)
1300                 return;
1301         vma_list->vma = vma;
1302         mutex_lock(&buffer->lock);
1303         list_add(&vma_list->list, &buffer->vmas);
1304         mutex_unlock(&buffer->lock);
1305         pr_debug("%s: adding %p\n", __func__, vma);
1306 }
1307
1308 static void ion_vm_close(struct vm_area_struct *vma)
1309 {
1310         struct ion_buffer *buffer = vma->vm_private_data;
1311         struct ion_vma_list *vma_list, *tmp;
1312
1313         pr_debug("%s\n", __func__);
1314         mutex_lock(&buffer->lock);
1315         list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
1316                 if (vma_list->vma != vma)
1317                         continue;
1318                 list_del(&vma_list->list);
1319                 kfree(vma_list);
1320                 pr_debug("%s: deleting %p\n", __func__, vma);
1321                 break;
1322         }
1323         mutex_unlock(&buffer->lock);
1324 }
1325
1326 static struct vm_operations_struct ion_vma_ops = {
1327         .open = ion_vm_open,
1328         .close = ion_vm_close,
1329         .fault = ion_vm_fault,
1330 };
1331
1332 static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
1333 {
1334         struct ion_buffer *buffer = dmabuf->priv;
1335         int ret = 0;
1336
1337         if (!buffer->heap->ops->map_user) {
1338                 pr_err("%s: this heap does not define a method for mapping "
1339                        "to userspace\n", __func__);
1340                 return -EINVAL;
1341         }
1342
1343         if (ion_buffer_fault_user_mappings(buffer)) {
1344                 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
1345                                                         VM_DONTDUMP;
1346                 vma->vm_private_data = buffer;
1347                 vma->vm_ops = &ion_vma_ops;
1348                 ion_vm_open(vma);
1349                 return 0;
1350         }
1351
1352         if (!(buffer->flags & ION_FLAG_CACHED))
1353                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1354
1355         mutex_lock(&buffer->lock);
1356         /* now map it to userspace */
1357         ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
1358         mutex_unlock(&buffer->lock);
1359
1360         if (ret)
1361                 pr_err("%s: failure mapping buffer to userspace\n",
1362                        __func__);
1363
1364         return ret;
1365 }
1366
1367 static void ion_dma_buf_release(struct dma_buf *dmabuf)
1368 {
1369         struct ion_buffer *buffer = dmabuf->priv;
1370         ion_buffer_put(buffer);
1371 }
1372
1373 static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
1374 {
1375         struct ion_buffer *buffer = dmabuf->priv;
1376         return buffer->vaddr + offset * PAGE_SIZE;
1377 }
1378
1379 static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
1380                                void *ptr)
1381 {
1382         return;
1383 }
1384
1385 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
1386                                         size_t len,
1387                                         enum dma_data_direction direction)
1388 {
1389         struct ion_buffer *buffer = dmabuf->priv;
1390         void *vaddr;
1391
1392         if (!buffer->heap->ops->map_kernel) {
1393                 pr_err("%s: map kernel is not implemented by this heap.\n",
1394                        __func__);
1395                 return -ENODEV;
1396         }
1397
1398         mutex_lock(&buffer->lock);
1399         vaddr = ion_buffer_kmap_get(buffer);
1400         mutex_unlock(&buffer->lock);
1401         if (IS_ERR(vaddr))
1402                 return PTR_ERR(vaddr);
1403         return 0;
1404 }
1405
1406 static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
1407                                        size_t len,
1408                                        enum dma_data_direction direction)
1409 {
1410         struct ion_buffer *buffer = dmabuf->priv;
1411
1412         mutex_lock(&buffer->lock);
1413         ion_buffer_kmap_put(buffer);
1414         mutex_unlock(&buffer->lock);
1415 }
1416
1417 static struct dma_buf_ops dma_buf_ops = {
1418         .map_dma_buf = ion_map_dma_buf,
1419         .unmap_dma_buf = ion_unmap_dma_buf,
1420         .mmap = ion_mmap,
1421         .release = ion_dma_buf_release,
1422         .begin_cpu_access = ion_dma_buf_begin_cpu_access,
1423         .end_cpu_access = ion_dma_buf_end_cpu_access,
1424         .kmap_atomic = ion_dma_buf_kmap,
1425         .kunmap_atomic = ion_dma_buf_kunmap,
1426         .kmap = ion_dma_buf_kmap,
1427         .kunmap = ion_dma_buf_kunmap,
1428 };
1429
1430 struct dma_buf *ion_share_dma_buf(struct ion_client *client,
1431                                                 struct ion_handle *handle)
1432 {
1433         struct ion_buffer *buffer;
1434         struct dma_buf *dmabuf;
1435         bool valid_handle;
1436
1437         mutex_lock(&client->lock);
1438         valid_handle = ion_handle_validate(client, handle);
1439         if (!valid_handle) {
1440                 WARN(1, "%s: invalid handle passed to share.\n", __func__);
1441                 mutex_unlock(&client->lock);
1442                 return ERR_PTR(-EINVAL);
1443         }
1444         buffer = handle->buffer;
1445         ion_buffer_get(buffer);
1446         mutex_unlock(&client->lock);
1447
1448         dmabuf = dma_buf_export(buffer, &dma_buf_ops, buffer->size, O_RDWR);
1449         if (IS_ERR(dmabuf)) {
1450                 ion_buffer_put(buffer);
1451                 return dmabuf;
1452         }
1453
1454         return dmabuf;
1455 }
1456 EXPORT_SYMBOL(ion_share_dma_buf);
1457
1458 int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
1459 {
1460         struct dma_buf *dmabuf;
1461         int fd;
1462
1463         dmabuf = ion_share_dma_buf(client, handle);
1464         if (IS_ERR(dmabuf))
1465                 return PTR_ERR(dmabuf);
1466
1467         fd = dma_buf_fd(dmabuf, O_CLOEXEC);
1468         if (fd < 0)
1469                 dma_buf_put(dmabuf);
1470
1471         trace_ion_buffer_share(client->display_name, (unsigned int)handle->buffer,
1472                                 handle->buffer->size, fd);
1473         return fd;
1474 }
1475 EXPORT_SYMBOL(ion_share_dma_buf_fd);
1476
1477 struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
1478 {
1479         struct dma_buf *dmabuf;
1480         struct ion_buffer *buffer;
1481         struct ion_handle *handle;
1482         int ret;
1483
1484         dmabuf = dma_buf_get(fd);
1485         if (IS_ERR(dmabuf))
1486                 return ERR_PTR(PTR_ERR(dmabuf));
1487         /* if this memory came from ion */
1488
1489         if (dmabuf->ops != &dma_buf_ops) {
1490                 pr_err("%s: can not import dmabuf from another exporter\n",
1491                        __func__);
1492                 dma_buf_put(dmabuf);
1493                 return ERR_PTR(-EINVAL);
1494         }
1495         buffer = dmabuf->priv;
1496
1497         mutex_lock(&client->lock);
1498         /* if a handle exists for this buffer just take a reference to it */
1499         handle = ion_handle_lookup(client, buffer);
1500         if (!IS_ERR(handle)) {
1501                 ion_handle_get(handle);
1502                 mutex_unlock(&client->lock);
1503                 goto end;
1504         }
1505         mutex_unlock(&client->lock);
1506
1507         handle = ion_handle_create(client, buffer);
1508         if (IS_ERR(handle))
1509                 goto end;
1510
1511         mutex_lock(&client->lock);
1512         ret = ion_handle_add(client, handle);
1513         mutex_unlock(&client->lock);
1514         if (ret) {
1515                 ion_handle_put(handle);
1516                 handle = ERR_PTR(ret);
1517         }
1518
1519         trace_ion_buffer_import(client->display_name, (unsigned int)buffer,
1520                                 buffer->size);
1521 end:
1522         dma_buf_put(dmabuf);
1523         return handle;
1524 }
1525 EXPORT_SYMBOL(ion_import_dma_buf);
1526
1527 static int ion_sync_for_device(struct ion_client *client, int fd)
1528 {
1529         struct dma_buf *dmabuf;
1530         struct ion_buffer *buffer;
1531
1532         dmabuf = dma_buf_get(fd);
1533         if (IS_ERR(dmabuf))
1534                 return PTR_ERR(dmabuf);
1535
1536         /* if this memory came from ion */
1537         if (dmabuf->ops != &dma_buf_ops) {
1538                 pr_err("%s: can not sync dmabuf from another exporter\n",
1539                        __func__);
1540                 dma_buf_put(dmabuf);
1541                 return -EINVAL;
1542         }
1543         buffer = dmabuf->priv;
1544
1545         dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
1546                                buffer->sg_table->nents, DMA_BIDIRECTIONAL);
1547         dma_buf_put(dmabuf);
1548         return 0;
1549 }
1550
1551 /* fix up the cases where the ioctl direction bits are incorrect */
1552 static unsigned int ion_ioctl_dir(unsigned int cmd)
1553 {
1554         switch (cmd) {
1555         case ION_IOC_SYNC:
1556         case ION_IOC_FREE:
1557         case ION_IOC_CUSTOM:
1558                 return _IOC_WRITE;
1559         default:
1560                 return _IOC_DIR(cmd);
1561         }
1562 }
1563
1564 static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1565 {
1566         struct ion_client *client = filp->private_data;
1567         struct ion_device *dev = client->dev;
1568         struct ion_handle *cleanup_handle = NULL;
1569         int ret = 0;
1570         unsigned int dir;
1571
1572         union {
1573                 struct ion_fd_data fd;
1574                 struct ion_allocation_data allocation;
1575                 struct ion_handle_data handle;
1576                 struct ion_custom_data custom;
1577         } data;
1578
1579         dir = ion_ioctl_dir(cmd);
1580
1581         if (_IOC_SIZE(cmd) > sizeof(data))
1582                 return -EINVAL;
1583
1584         if (dir & _IOC_WRITE)
1585                 if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
1586                         return -EFAULT;
1587
1588         switch (cmd) {
1589         case ION_IOC_ALLOC:
1590         {
1591                 struct ion_handle *handle;
1592
1593                 handle = ion_alloc(client, data.allocation.len,
1594                                                 data.allocation.align,
1595                                                 data.allocation.heap_id_mask,
1596                                                 data.allocation.flags);
1597                 if (IS_ERR(handle))
1598                         return PTR_ERR(handle);
1599
1600                 data.allocation.handle = handle->id;
1601
1602                 cleanup_handle = handle;
1603                 break;
1604         }
1605         case ION_IOC_FREE:
1606         {
1607                 struct ion_handle *handle;
1608
1609                 handle = ion_handle_get_by_id(client, data.handle.handle);
1610                 if (IS_ERR(handle))
1611                         return PTR_ERR(handle);
1612                 ion_free(client, handle);
1613                 ion_handle_put(handle);
1614                 break;
1615         }
1616         case ION_IOC_SHARE:
1617         case ION_IOC_MAP:
1618         {
1619                 struct ion_handle *handle;
1620
1621                 handle = ion_handle_get_by_id(client, data.handle.handle);
1622                 if (IS_ERR(handle))
1623                         return PTR_ERR(handle);
1624                 data.fd.fd = ion_share_dma_buf_fd(client, handle);
1625                 ion_handle_put(handle);
1626                 if (data.fd.fd < 0)
1627                         ret = data.fd.fd;
1628                 break;
1629         }
1630         case ION_IOC_IMPORT:
1631         {
1632                 struct ion_handle *handle;
1633                 handle = ion_import_dma_buf(client, data.fd.fd);
1634                 if (IS_ERR(handle))
1635                         ret = PTR_ERR(handle);
1636                 else
1637                         data.handle.handle = handle->id;
1638                 break;
1639         }
1640         case ION_IOC_SYNC:
1641         {
1642                 ret = ion_sync_for_device(client, data.fd.fd);
1643                 break;
1644         }
1645         case ION_IOC_CUSTOM:
1646         {
1647                 if (!dev->custom_ioctl)
1648                         return -ENOTTY;
1649                 ret = dev->custom_ioctl(client, data.custom.cmd,
1650                                                 data.custom.arg);
1651                 break;
1652         }
1653         default:
1654                 return -ENOTTY;
1655         }
1656
1657         if (dir & _IOC_READ) {
1658                 if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
1659                         if (cleanup_handle)
1660                                 ion_free(client, cleanup_handle);
1661                         return -EFAULT;
1662                 }
1663         }
1664         return ret;
1665 }
1666
1667 static int ion_release(struct inode *inode, struct file *file)
1668 {
1669         struct ion_client *client = file->private_data;
1670
1671         pr_debug("%s: %d\n", __func__, __LINE__);
1672         ion_client_destroy(client);
1673         return 0;
1674 }
1675
1676 static int ion_open(struct inode *inode, struct file *file)
1677 {
1678         struct miscdevice *miscdev = file->private_data;
1679         struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
1680         struct ion_client *client;
1681         char debug_name[64];
1682
1683         pr_debug("%s: %d\n", __func__, __LINE__);
1684         snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
1685         client = ion_client_create(dev, debug_name);
1686         if (IS_ERR(client))
1687                 return PTR_ERR(client);
1688         file->private_data = client;
1689
1690         return 0;
1691 }
1692
1693 static const struct file_operations ion_fops = {
1694         .owner          = THIS_MODULE,
1695         .open           = ion_open,
1696         .release        = ion_release,
1697         .unlocked_ioctl = ion_ioctl,
1698         .compat_ioctl   = compat_ion_ioctl,
1699 };
1700
1701 static size_t ion_debug_heap_total(struct ion_client *client,
1702                                    unsigned int id)
1703 {
1704         size_t size = 0;
1705         struct rb_node *n;
1706
1707         mutex_lock(&client->lock);
1708         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1709                 struct ion_handle *handle = rb_entry(n,
1710                                                      struct ion_handle,
1711                                                      node);
1712                 if (handle->buffer->heap->id == id)
1713                         size += handle->buffer->size;
1714         }
1715         mutex_unlock(&client->lock);
1716         return size;
1717 }
1718
1719 static int ion_debug_heap_show(struct seq_file *s, void *unused)
1720 {
1721         struct ion_heap *heap = s->private;
1722         struct ion_device *dev = heap->dev;
1723         struct rb_node *n;
1724         size_t total_size = 0;
1725         size_t total_orphaned_size = 0;
1726
1727         seq_printf(s, "%16.s %16.s %16.s\n", "client", "pid", "size");
1728         seq_printf(s, "----------------------------------------------------\n");
1729
1730         for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
1731                 struct ion_client *client = rb_entry(n, struct ion_client,
1732                                                      node);
1733                 size_t size = ion_debug_heap_total(client, heap->id);
1734                 if (!size)
1735                         continue;
1736                 if (client->task) {
1737                         char task_comm[TASK_COMM_LEN];
1738
1739                         get_task_comm(task_comm, client->task);
1740                         seq_printf(s, "%16.s %16u %16zu\n", task_comm,
1741                                    client->pid, size);
1742                 } else {
1743                         seq_printf(s, "%16.s %16u %16zu\n", client->name,
1744                                    client->pid, size);
1745                 }
1746         }
1747         seq_printf(s, "----------------------------------------------------\n");
1748         seq_printf(s, "orphaned allocations (info is from last known client):"
1749                    "\n");
1750         mutex_lock(&dev->buffer_lock);
1751         for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
1752                 struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
1753                                                      node);
1754                 if (buffer->heap->id != heap->id)
1755                         continue;
1756                 total_size += buffer->size;
1757                 if (!buffer->handle_count) {
1758                         seq_printf(s, "%16.s %16u %16zu %d %d\n",
1759                                    buffer->task_comm, buffer->pid,
1760                                    buffer->size, buffer->kmap_cnt,
1761                                    atomic_read(&buffer->ref.refcount));
1762                         total_orphaned_size += buffer->size;
1763                 }
1764         }
1765         mutex_unlock(&dev->buffer_lock);
1766         seq_printf(s, "----------------------------------------------------\n");
1767         seq_printf(s, "%16.s %16zu\n", "total orphaned",
1768                    total_orphaned_size);
1769         seq_printf(s, "%16.s %16zu\n", "total ", total_size);
1770         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1771                 seq_printf(s, "%16.s %16zu\n", "deferred free",
1772                                 heap->free_list_size);
1773         seq_printf(s, "----------------------------------------------------\n");
1774
1775         if (heap->debug_show)
1776                 heap->debug_show(heap, s, unused);
1777
1778         return 0;
1779 }
1780
1781 static int ion_debug_heap_open(struct inode *inode, struct file *file)
1782 {
1783         return single_open(file, ion_debug_heap_show, inode->i_private);
1784 }
1785
1786 static const struct file_operations debug_heap_fops = {
1787         .open = ion_debug_heap_open,
1788         .read = seq_read,
1789         .llseek = seq_lseek,
1790         .release = single_release,
1791 };
1792
1793 #ifdef DEBUG_HEAP_SHRINKER
1794 static int debug_shrink_set(void *data, u64 val)
1795 {
1796         struct ion_heap *heap = data;
1797         struct shrink_control sc;
1798         int objs;
1799
1800         sc.gfp_mask = -1;
1801         sc.nr_to_scan = 0;
1802
1803         if (!val)
1804                 return 0;
1805
1806         objs = heap->shrinker.shrink(&heap->shrinker, &sc);
1807         sc.nr_to_scan = objs;
1808
1809         heap->shrinker.shrink(&heap->shrinker, &sc);
1810         return 0;
1811 }
1812
1813 static int debug_shrink_get(void *data, u64 *val)
1814 {
1815         struct ion_heap *heap = data;
1816         struct shrink_control sc;
1817         int objs;
1818
1819         sc.gfp_mask = -1;
1820         sc.nr_to_scan = 0;
1821
1822         objs = heap->shrinker.shrink(&heap->shrinker, &sc);
1823         *val = objs;
1824         return 0;
1825 }
1826
1827 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
1828                         debug_shrink_set, "%llu\n");
1829 #endif
1830
1831 #ifdef CONFIG_CMA
1832 // struct "cma" quoted from drivers/base/dma-contiguous.c
1833 struct cma {
1834         unsigned long   base_pfn;
1835         unsigned long   count;
1836         unsigned long   *bitmap;
1837 };
1838
1839 // struct "ion_cma_heap" quoted from drivers/staging/android/ion/ion_cma_heap.c
1840 struct ion_cma_heap {
1841         struct ion_heap heap;
1842         struct device *dev;
1843 };
1844
1845 static int ion_cma_heap_debug_show(struct seq_file *s, void *unused)
1846 {
1847         struct ion_heap *heap = s->private;
1848         struct ion_cma_heap *cma_heap = container_of(heap,
1849                                                         struct ion_cma_heap,
1850                                                         heap);
1851         struct device *dev = cma_heap->dev;
1852         struct cma *cma = dev_get_cma_area(dev);
1853         int i;
1854         int rows = cma->count/(SZ_1M >> PAGE_SHIFT);
1855         phys_addr_t base = __pfn_to_phys(cma->base_pfn);
1856
1857         seq_printf(s, "%s Heap bitmap:\n", heap->name);
1858
1859         for(i = rows - 1; i>= 0; i--){
1860                 seq_printf(s, "%.4uM@0x%08x: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
1861                                 i+1, base+(i)*SZ_1M,
1862                                 cma->bitmap[i*8 + 7],
1863                                 cma->bitmap[i*8 + 6],
1864                                 cma->bitmap[i*8 + 5],
1865                                 cma->bitmap[i*8 + 4],
1866                                 cma->bitmap[i*8 + 3],
1867                                 cma->bitmap[i*8 + 2],
1868                                 cma->bitmap[i*8 + 1],
1869                                 cma->bitmap[i*8]);
1870         }
1871         seq_printf(s, "Heap size: %luM, Heap base: 0x%08x\n",
1872                 (cma->count)>>8, base);
1873
1874         return 0;
1875 }
1876
1877 static int ion_debug_heap_bitmap_open(struct inode *inode, struct file *file)
1878 {
1879         return single_open(file, ion_cma_heap_debug_show, inode->i_private);
1880 }
1881
1882 static const struct file_operations debug_heap_bitmap_fops = {
1883         .open = ion_debug_heap_bitmap_open,
1884         .read = seq_read,
1885         .llseek = seq_lseek,
1886         .release = single_release,
1887 };
1888 #endif
1889
1890 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
1891 {
1892         struct dentry *debug_file;
1893
1894         if (!heap->ops->allocate || !heap->ops->free || !heap->ops->map_dma ||
1895             !heap->ops->unmap_dma)
1896                 pr_err("%s: can not add heap with invalid ops struct.\n",
1897                        __func__);
1898
1899         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1900                 ion_heap_init_deferred_free(heap);
1901
1902         if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
1903                 ion_heap_init_shrinker(heap);
1904
1905         heap->dev = dev;
1906         down_write(&dev->lock);
1907         /* use negative heap->id to reverse the priority -- when traversing
1908            the list later attempt higher id numbers first */
1909         plist_node_init(&heap->node, -heap->id);
1910         plist_add(&heap->node, &dev->heaps);
1911         debug_file = debugfs_create_file(heap->name, 0664,
1912                                         dev->heaps_debug_root, heap,
1913                                         &debug_heap_fops);
1914
1915         if (!debug_file) {
1916                 char buf[256], *path;
1917                 path = dentry_path(dev->heaps_debug_root, buf, 256);
1918                 pr_err("Failed to create heap debugfs at %s/%s\n",
1919                         path, heap->name);
1920         }
1921
1922 #ifdef DEBUG_HEAP_SHRINKER
1923         if (heap->shrinker.shrink) {
1924                 char debug_name[64];
1925
1926                 snprintf(debug_name, 64, "%s_shrink", heap->name);
1927                 debug_file = debugfs_create_file(
1928                         debug_name, 0644, dev->heaps_debug_root, heap,
1929                         &debug_shrink_fops);
1930                 if (!debug_file) {
1931                         char buf[256], *path;
1932                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1933                         pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
1934                                 path, debug_name);
1935                 }
1936         }
1937 #endif
1938 #ifdef CONFIG_CMA
1939         if (ION_HEAP_TYPE_DMA==heap->type) {
1940                 char* heap_bitmap_name = kasprintf(
1941                         GFP_KERNEL, "%s-bitmap", heap->name);
1942                 debug_file = debugfs_create_file(heap_bitmap_name, 0664,
1943                                                 dev->heaps_debug_root, heap,
1944                                                 &debug_heap_bitmap_fops);
1945                 if (!debug_file) {
1946                         char buf[256], *path;
1947                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1948                         pr_err("Failed to create heap debugfs at %s/%s\n",
1949                                 path, heap_bitmap_name);
1950                 }
1951                 kfree(heap_bitmap_name);
1952         }
1953 #endif
1954         up_write(&dev->lock);
1955 }
1956
1957 struct ion_device *ion_device_create(long (*custom_ioctl)
1958                                      (struct ion_client *client,
1959                                       unsigned int cmd,
1960                                       unsigned long arg))
1961 {
1962         struct ion_device *idev;
1963         int ret;
1964
1965         idev = kzalloc(sizeof(struct ion_device), GFP_KERNEL);
1966         if (!idev)
1967                 return ERR_PTR(-ENOMEM);
1968
1969         idev->dev.minor = MISC_DYNAMIC_MINOR;
1970         idev->dev.name = "ion";
1971         idev->dev.fops = &ion_fops;
1972         idev->dev.parent = NULL;
1973         ret = misc_register(&idev->dev);
1974         if (ret) {
1975                 pr_err("ion: failed to register misc device.\n");
1976                 return ERR_PTR(ret);
1977         }
1978
1979         idev->debug_root = debugfs_create_dir("ion", NULL);
1980         if (!idev->debug_root) {
1981                 pr_err("ion: failed to create debugfs root directory.\n");
1982                 goto debugfs_done;
1983         }
1984         idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
1985         if (!idev->heaps_debug_root) {
1986                 pr_err("ion: failed to create debugfs heaps directory.\n");
1987                 goto debugfs_done;
1988         }
1989         idev->clients_debug_root = debugfs_create_dir("clients",
1990                                                 idev->debug_root);
1991         if (!idev->clients_debug_root)
1992                 pr_err("ion: failed to create debugfs clients directory.\n");
1993
1994 #ifdef CONFIG_ION_ROCKCHIP_SNAPSHOT
1995         rockchip_ion_snapshot_debugfs(idev->debug_root);
1996 #endif
1997
1998 debugfs_done:
1999
2000         idev->custom_ioctl = custom_ioctl;
2001         idev->buffers = RB_ROOT;
2002         mutex_init(&idev->buffer_lock);
2003         init_rwsem(&idev->lock);
2004         plist_head_init(&idev->heaps);
2005         idev->clients = RB_ROOT;
2006         return idev;
2007 }
2008
2009 void ion_device_destroy(struct ion_device *dev)
2010 {
2011         misc_deregister(&dev->dev);
2012         debugfs_remove_recursive(dev->debug_root);
2013         /* XXX need to free the heaps and clients ? */
2014         kfree(dev);
2015 }
2016
2017 void __init ion_reserve(struct ion_platform_data *data)
2018 {
2019         int i;
2020
2021         for (i = 0; i < data->nr; i++) {
2022                 if (data->heaps[i].size == 0)
2023                         continue;
2024
2025                 if (data->heaps[i].id==ION_CMA_HEAP_ID) {
2026                         struct device *dev = (struct device*)data->heaps[i].priv;
2027                         int ret = dma_declare_contiguous(dev,
2028                                                 data->heaps[i].size,
2029                                                 data->heaps[i].base,
2030                                                 MEMBLOCK_ALLOC_ANYWHERE);
2031                         if (ret) {
2032                                 pr_err("%s: dma_declare_contiguous failed %d\n",
2033                                         __func__, ret);
2034                                 continue;
2035                         };
2036                         data->heaps[i].base = PFN_PHYS(dev_get_cma_area(dev)->base_pfn);
2037                 } else if (data->heaps[i].base == 0) {
2038                         phys_addr_t paddr;
2039                         paddr = memblock_alloc_base(data->heaps[i].size,
2040                                                     data->heaps[i].align,
2041                                                     MEMBLOCK_ALLOC_ANYWHERE);
2042                         if (!paddr) {
2043                                 pr_err("%s: error allocating memblock for "
2044                                        "heap %d\n",
2045                                         __func__, i);
2046                                 continue;
2047                         }
2048                         data->heaps[i].base = paddr;
2049                 } else {
2050                         int ret = memblock_reserve(data->heaps[i].base,
2051                                                data->heaps[i].size);
2052                         if (ret) {
2053                                 pr_err("memblock reserve of %zx@%lx failed\n",
2054                                        data->heaps[i].size,
2055                                        data->heaps[i].base);
2056                                 continue;
2057                         }
2058                 }
2059                 pr_info("%s: %s reserved base %lx size %zu\n", __func__,
2060                         data->heaps[i].name,
2061                         data->heaps[i].base,
2062                         data->heaps[i].size);
2063         }
2064 }
2065
2066 #ifdef CONFIG_ION_ROCKCHIP_SNAPSHOT
2067
2068 // Find the maximum can be allocated memory
2069 static unsigned long ion_find_max_zero_area(unsigned long *map, unsigned long size)
2070 {
2071         unsigned long index, i, zero_sz, max_zero_sz, start;
2072         start = 0;
2073         max_zero_sz = 0;
2074
2075         do {
2076                 index = find_next_zero_bit(map, size, start);
2077                 if (index>=size) break;
2078
2079                 i = find_next_bit(map, size, index);
2080                 zero_sz = i-index;
2081                 pr_debug("zero[%lx, %lx]\n", index, zero_sz);
2082                 max_zero_sz = max(max_zero_sz, zero_sz);
2083                 start = i + 1;
2084         } while(start<=size);
2085
2086         pr_debug("max_zero_sz=%lx\n", max_zero_sz);
2087         return max_zero_sz;
2088 }
2089
2090 static int ion_snapshot_save(struct ion_device *idev, size_t len)
2091 {
2092         static struct seq_file seqf;
2093         struct ion_heap *heap;
2094
2095         if (!seqf.buf) {
2096                 seqf.buf = rockchip_ion_snapshot_get(&seqf.size);
2097                 if (!seqf.buf)
2098                         return -ENOMEM;
2099         }
2100         memset(seqf.buf, 0, seqf.size);
2101         seqf.count = 0;
2102         pr_debug("%s: save snapshot 0x%x@0x%lx\n", __func__, seqf.size,
2103                 __pa(seqf.buf));
2104
2105         seq_printf(&seqf, "call by comm: %s pid: %d, alloc: %uKB\n",
2106                 current->comm, current->pid, len>>10);
2107
2108         down_read(&idev->lock);
2109
2110         plist_for_each_entry(heap, &idev->heaps, node) {
2111                 seqf.private = (void*)heap;
2112                 seq_printf(&seqf, "++++++++++++++++ HEAP: %s ++++++++++++++++\n",
2113                         heap->name);
2114                 ion_debug_heap_show(&seqf, NULL);
2115                 if (ION_HEAP_TYPE_DMA==heap->type) {
2116                         struct ion_cma_heap *cma_heap = container_of(heap,
2117                                                                         struct ion_cma_heap,
2118                                                                         heap);
2119                         struct cma *cma = dev_get_cma_area(cma_heap->dev);
2120                         seq_printf(&seqf, "\n");
2121                         seq_printf(&seqf, "Maximum allocation of pages: %ld\n",
2122                                         ion_find_max_zero_area(cma->bitmap, cma->count));
2123                         seq_printf(&seqf, "\n");
2124                 }
2125         }
2126
2127         up_read(&idev->lock);
2128
2129         return 0;
2130 }
2131 #endif