drivers/staging/android/ion/ion.c

   1 /*
   2  *
   3  * drivers/staging/android/ion/ion.c
   4  *
   5  * Copyright (C) 2011 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/err.h>
  20 #include <linux/file.h>
  21 #include <linux/freezer.h>
  22 #include <linux/fs.h>
  23 #include <linux/anon_inodes.h>
  24 #include <linux/kthread.h>
  25 #include <linux/list.h>
  26 #include <linux/memblock.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/export.h>
  29 #include <linux/mm.h>
  30 #include <linux/mm_types.h>
  31 #include <linux/rbtree.h>
  32 #include <linux/slab.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/debugfs.h>
  37 #include <linux/dma-buf.h>
  38 #include <linux/idr.h>
  39
  40 #include "ion.h"
  41 #include "ion_priv.h"
  42 #include "compat_ion.h"
  43
  44 /**
  45  * struct ion_device - the metadata of the ion device node
  46  * @dev:                the actual misc device
  47  * @buffers:            an rb tree of all the existing buffers
  48  * @buffer_lock:        lock protecting the tree of buffers
  49  * @lock:               rwsem protecting the tree of heaps and clients
  50  * @heaps:              list of all the heaps in the system
  51  * @user_clients:       list of all the clients created from userspace
  52  */
  53 struct ion_device {
  54         struct miscdevice dev;
  55         struct rb_root buffers;
  56         struct mutex buffer_lock;
  57         struct rw_semaphore lock;
  58         struct plist_head heaps;
  59         long (*custom_ioctl)(struct ion_client *client, unsigned int cmd,
  60                              unsigned long arg);
  61         struct rb_root clients;
  62         struct dentry *debug_root;
  63         struct dentry *heaps_debug_root;
  64         struct dentry *clients_debug_root;
  65 };
  66
  67 /**
  68  * struct ion_client - a process/hw block local address space
  69  * @node:               node in the tree of all clients
  70  * @dev:                backpointer to ion device
  71  * @handles:            an rb tree of all the handles in this client
  72  * @idr:                an idr space for allocating handle ids
  73  * @lock:               lock protecting the tree of handles
  74  * @name:               used for debugging
  75  * @display_name:       used for debugging (unique version of @name)
  76  * @display_serial:     used for debugging (to make display_name unique)
  77  * @task:               used for debugging
  78  *
  79  * A client represents a list of buffers this client may access.
  80  * The mutex stored here is used to protect both handles tree
  81  * as well as the handles themselves, and should be held while modifying either.
  82  */
  83 struct ion_client {
  84         struct rb_node node;
  85         struct ion_device *dev;
  86         struct rb_root handles;
  87         struct idr idr;
  88         struct mutex lock;
  89         const char *name;
  90         char *display_name;
  91         int display_serial;
  92         struct task_struct *task;
  93         pid_t pid;
  94         struct dentry *debug_root;
  95 };
  96
  97 /**
  98  * ion_handle - a client local reference to a buffer
  99  * @ref:                reference count
 100  * @client:             back pointer to the client the buffer resides in
 101  * @buffer:             pointer to the buffer
 102  * @node:               node in the client's handle rbtree
 103  * @kmap_cnt:           count of times this client has mapped to kernel
 104  * @id:                 client-unique id allocated by client->idr
 105  *
 106  * Modifications to node, map_cnt or mapping should be protected by the
 107  * lock in the client.  Other fields are never changed after initialization.
 108  */
 109 struct ion_handle {
 110         struct kref ref;
 111         struct ion_client *client;
 112         struct ion_buffer *buffer;
 113         struct rb_node node;
 114         unsigned int kmap_cnt;
 115         int id;
 116 };
 117
 118 bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
 119 {
 120         return (buffer->flags & ION_FLAG_CACHED) &&
 121                 !(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
 122 }
 123
 124 bool ion_buffer_cached(struct ion_buffer *buffer)
 125 {
 126         return !!(buffer->flags & ION_FLAG_CACHED);
 127 }
 128
 129 static inline struct page *ion_buffer_page(struct page *page)
 130 {
 131         return (struct page *)((unsigned long)page & ~(1UL));
 132 }
 133
 134 static inline bool ion_buffer_page_is_dirty(struct page *page)
 135 {
 136         return !!((unsigned long)page & 1UL);
 137 }
 138
 139 static inline void ion_buffer_page_dirty(struct page **page)
 140 {
 141         *page = (struct page *)((unsigned long)(*page) | 1UL);
 142 }
 143
 144 static inline void ion_buffer_page_clean(struct page **page)
 145 {
 146         *page = (struct page *)((unsigned long)(*page) & ~(1UL));
 147 }
 148
 149 /* this function should only be called while dev->lock is held */
 150 static void ion_buffer_add(struct ion_device *dev,
 151                            struct ion_buffer *buffer)
 152 {
 153         struct rb_node **p = &dev->buffers.rb_node;
 154         struct rb_node *parent = NULL;
 155         struct ion_buffer *entry;
 156
 157         while (*p) {
 158                 parent = *p;
 159                 entry = rb_entry(parent, struct ion_buffer, node);
 160
 161                 if (buffer < entry) {
 162                         p = &(*p)->rb_left;
 163                 } else if (buffer > entry) {
 164                         p = &(*p)->rb_right;
 165                 } else {
 166                         pr_err("%s: buffer already found.", __func__);
 167                         BUG();
 168                 }
 169         }
 170
 171         rb_link_node(&buffer->node, parent, p);
 172         rb_insert_color(&buffer->node, &dev->buffers);
 173 }
 174
 175 /* this function should only be called while dev->lock is held */
 176 static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 177                                      struct ion_device *dev,
 178                                      unsigned long len,
 179                                      unsigned long align,
 180                                      unsigned long flags)
 181 {
 182         struct ion_buffer *buffer;
 183         struct sg_table *table;
 184         struct scatterlist *sg;
 185         int i, ret;
 186
 187         buffer = kzalloc(sizeof(struct ion_buffer), GFP_KERNEL);
 188         if (!buffer)
 189                 return ERR_PTR(-ENOMEM);
 190
 191         buffer->heap = heap;
 192         buffer->flags = flags;
 193         kref_init(&buffer->ref);
 194
 195         ret = heap->ops->allocate(heap, buffer, len, align, flags);
 196
 197         if (ret) {
 198                 if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
 199                         goto err2;
 200
 201                 ion_heap_freelist_drain(heap, 0);
 202                 ret = heap->ops->allocate(heap, buffer, len, align,
 203                                           flags);
 204                 if (ret)
 205                         goto err2;
 206         }
 207
 208         buffer->dev = dev;
 209         buffer->size = len;
 210
 211         table = heap->ops->map_dma(heap, buffer);
 212         if (WARN_ONCE(table == NULL,
 213                         "heap->ops->map_dma should return ERR_PTR on error"))
 214                 table = ERR_PTR(-EINVAL);
 215         if (IS_ERR(table)) {
 216                 ret = -EINVAL;
 217                 goto err1;
 218         }
 219
 220         buffer->sg_table = table;
 221         if (ion_buffer_fault_user_mappings(buffer)) {
 222                 int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 223                 struct scatterlist *sg;
 224                 int i, j, k = 0;
 225
 226                 buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
 227                 if (!buffer->pages) {
 228                         ret = -ENOMEM;
 229                         goto err;
 230                 }
 231
 232                 for_each_sg(table->sgl, sg, table->nents, i) {
 233                         struct page *page = sg_page(sg);
 234
 235                         for (j = 0; j < sg->length / PAGE_SIZE; j++)
 236                                 buffer->pages[k++] = page++;
 237                 }
 238         }
 239
 240         buffer->dev = dev;
 241         buffer->size = len;
 242         INIT_LIST_HEAD(&buffer->vmas);
 243         mutex_init(&buffer->lock);
 244         /*
 245          * this will set up dma addresses for the sglist -- it is not
 246          * technically correct as per the dma api -- a specific
 247          * device isn't really taking ownership here.  However, in practice on
 248          * our systems the only dma_address space is physical addresses.
 249          * Additionally, we can't afford the overhead of invalidating every
 250          * allocation via dma_map_sg. The implicit contract here is that
 251          * memory coming from the heaps is ready for dma, ie if it has a
 252          * cached mapping that mapping has been invalidated
 253          */
 254         for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i) {
 255                 sg_dma_address(sg) = sg_phys(sg);
 256                 sg_dma_len(sg) = sg->length;
 257         }
 258         mutex_lock(&dev->buffer_lock);
 259         ion_buffer_add(dev, buffer);
 260         mutex_unlock(&dev->buffer_lock);
 261         return buffer;
 262
 263 err:
 264         heap->ops->unmap_dma(heap, buffer);
 265 err1:
 266         heap->ops->free(buffer);
 267 err2:
 268         kfree(buffer);
 269         return ERR_PTR(ret);
 270 }
 271
 272 void ion_buffer_destroy(struct ion_buffer *buffer)
 273 {
 274         if (WARN_ON(buffer->kmap_cnt > 0))
 275                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 276         buffer->heap->ops->unmap_dma(buffer->heap, buffer);
 277         buffer->heap->ops->free(buffer);
 278         vfree(buffer->pages);
 279         kfree(buffer);
 280 }
 281
 282 static void _ion_buffer_destroy(struct kref *kref)
 283 {
 284         struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
 285         struct ion_heap *heap = buffer->heap;
 286         struct ion_device *dev = buffer->dev;
 287
 288         mutex_lock(&dev->buffer_lock);
 289         rb_erase(&buffer->node, &dev->buffers);
 290         mutex_unlock(&dev->buffer_lock);
 291
 292         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
 293                 ion_heap_freelist_add(heap, buffer);
 294         else
 295                 ion_buffer_destroy(buffer);
 296 }
 297
 298 static void ion_buffer_get(struct ion_buffer *buffer)
 299 {
 300         kref_get(&buffer->ref);
 301 }
 302
 303 static int ion_buffer_put(struct ion_buffer *buffer)
 304 {
 305         return kref_put(&buffer->ref, _ion_buffer_destroy);
 306 }
 307
 308 static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
 309 {
 310         mutex_lock(&buffer->lock);
 311         buffer->handle_count++;
 312         mutex_unlock(&buffer->lock);
 313 }
 314
 315 static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
 316 {
 317         /*
 318          * when a buffer is removed from a handle, if it is not in
 319          * any other handles, copy the taskcomm and the pid of the
 320          * process it's being removed from into the buffer.  At this
 321          * point there will be no way to track what processes this buffer is
 322          * being used by, it only exists as a dma_buf file descriptor.
 323          * The taskcomm and pid can provide a debug hint as to where this fd
 324          * is in the system
 325          */
 326         mutex_lock(&buffer->lock);
 327         buffer->handle_count--;
 328         BUG_ON(buffer->handle_count < 0);
 329         if (!buffer->handle_count) {
 330                 struct task_struct *task;
 331
 332                 task = current->group_leader;
 333                 get_task_comm(buffer->task_comm, task);
 334                 buffer->pid = task_pid_nr(task);
 335         }
 336         mutex_unlock(&buffer->lock);
 337 }
 338
 339 static struct ion_handle *ion_handle_create(struct ion_client *client,
 340                                      struct ion_buffer *buffer)
 341 {
 342         struct ion_handle *handle;
 343
 344         handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
 345         if (!handle)
 346                 return ERR_PTR(-ENOMEM);
 347         kref_init(&handle->ref);
 348         RB_CLEAR_NODE(&handle->node);
 349         handle->client = client;
 350         ion_buffer_get(buffer);
 351         ion_buffer_add_to_handle(buffer);
 352         handle->buffer = buffer;
 353
 354         return handle;
 355 }
 356
 357 static void ion_handle_kmap_put(struct ion_handle *);
 358
 359 static void ion_handle_destroy(struct kref *kref)
 360 {
 361         struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
 362         struct ion_client *client = handle->client;
 363         struct ion_buffer *buffer = handle->buffer;
 364
 365         mutex_lock(&buffer->lock);
 366         while (handle->kmap_cnt)
 367                 ion_handle_kmap_put(handle);
 368         mutex_unlock(&buffer->lock);
 369
 370         idr_remove(&client->idr, handle->id);
 371         if (!RB_EMPTY_NODE(&handle->node))
 372                 rb_erase(&handle->node, &client->handles);
 373
 374         ion_buffer_remove_from_handle(buffer);
 375         ion_buffer_put(buffer);
 376
 377         kfree(handle);
 378 }
 379
 380 struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
 381 {
 382         return handle->buffer;
 383 }
 384
 385 static void ion_handle_get(struct ion_handle *handle)
 386 {
 387         kref_get(&handle->ref);
 388 }
 389
 390 static int ion_handle_put_nolock(struct ion_handle *handle)
 391 {
 392         int ret;
 393
 394         ret = kref_put(&handle->ref, ion_handle_destroy);
 395
 396         return ret;
 397 }
 398
 399 int ion_handle_put(struct ion_handle *handle)
 400 {
 401         struct ion_client *client = handle->client;
 402         int ret;
 403
 404         mutex_lock(&client->lock);
 405         ret = ion_handle_put_nolock(handle);
 406         mutex_unlock(&client->lock);
 407
 408         return ret;
 409 }
 410
 411 static struct ion_handle *ion_handle_lookup(struct ion_client *client,
 412                                             struct ion_buffer *buffer)
 413 {
 414         struct rb_node *n = client->handles.rb_node;
 415
 416         while (n) {
 417                 struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
 418
 419                 if (buffer < entry->buffer)
 420                         n = n->rb_left;
 421                 else if (buffer > entry->buffer)
 422                         n = n->rb_right;
 423                 else
 424                         return entry;
 425         }
 426         return ERR_PTR(-EINVAL);
 427 }
 428
 429 static struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
 430                                                 int id)
 431 {
 432         struct ion_handle *handle;
 433
 434         handle = idr_find(&client->idr, id);
 435         if (handle)
 436                 ion_handle_get(handle);
 437
 438         return handle ? handle : ERR_PTR(-EINVAL);
 439 }
 440
 441 struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
 442                                                 int id)
 443 {
 444         struct ion_handle *handle;
 445
 446         mutex_lock(&client->lock);
 447         handle = ion_handle_get_by_id_nolock(client, id);
 448         mutex_unlock(&client->lock);
 449
 450         return handle;
 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                 return ERR_CAST(buffer);
 530
 531         handle = ion_handle_create(client, buffer);
 532
 533         /*
 534          * ion_buffer_create will create a buffer with a ref_cnt of 1,
 535          * and ion_handle_create will take a second reference, drop one here
 536          */
 537         ion_buffer_put(buffer);
 538
 539         if (IS_ERR(handle))
 540                 return handle;
 541
 542         mutex_lock(&client->lock);
 543         ret = ion_handle_add(client, handle);
 544         mutex_unlock(&client->lock);
 545         if (ret) {
 546                 ion_handle_put(handle);
 547                 handle = ERR_PTR(ret);
 548         }
 549
 550         return handle;
 551 }
 552 EXPORT_SYMBOL(ion_alloc);
 553
 554 static void ion_free_nolock(struct ion_client *client, struct ion_handle *handle)
 555 {
 556         bool valid_handle;
 557
 558         BUG_ON(client != handle->client);
 559
 560         valid_handle = ion_handle_validate(client, handle);
 561
 562         if (!valid_handle) {
 563                 WARN(1, "%s: invalid handle passed to free.\n", __func__);
 564                 return;
 565         }
 566         ion_handle_put_nolock(handle);
 567 }
 568
 569 void ion_free(struct ion_client *client, struct ion_handle *handle)
 570 {
 571         BUG_ON(client != handle->client);
 572
 573         mutex_lock(&client->lock);
 574         ion_free_nolock(client, handle);
 575         mutex_unlock(&client->lock);
 576 }
 577 EXPORT_SYMBOL(ion_free);
 578
 579 int ion_phys(struct ion_client *client, struct ion_handle *handle,
 580              ion_phys_addr_t *addr, size_t *len)
 581 {
 582         struct ion_buffer *buffer;
 583         int ret;
 584
 585         mutex_lock(&client->lock);
 586         if (!ion_handle_validate(client, handle)) {
 587                 mutex_unlock(&client->lock);
 588                 return -EINVAL;
 589         }
 590
 591         buffer = handle->buffer;
 592
 593         if (!buffer->heap->ops->phys) {
 594                 pr_err("%s: ion_phys is not implemented by this heap (name=%s, type=%d).\n",
 595                         __func__, buffer->heap->name, buffer->heap->type);
 596                 mutex_unlock(&client->lock);
 597                 return -ENODEV;
 598         }
 599         mutex_unlock(&client->lock);
 600         ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
 601         return ret;
 602 }
 603 EXPORT_SYMBOL(ion_phys);
 604
 605 static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
 606 {
 607         void *vaddr;
 608
 609         if (buffer->kmap_cnt) {
 610                 buffer->kmap_cnt++;
 611                 return buffer->vaddr;
 612         }
 613         vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
 614         if (WARN_ONCE(vaddr == NULL,
 615                         "heap->ops->map_kernel should return ERR_PTR on error"))
 616                 return ERR_PTR(-EINVAL);
 617         if (IS_ERR(vaddr))
 618                 return vaddr;
 619         buffer->vaddr = vaddr;
 620         buffer->kmap_cnt++;
 621         return vaddr;
 622 }
 623
 624 static void *ion_handle_kmap_get(struct ion_handle *handle)
 625 {
 626         struct ion_buffer *buffer = handle->buffer;
 627         void *vaddr;
 628
 629         if (handle->kmap_cnt) {
 630                 handle->kmap_cnt++;
 631                 return buffer->vaddr;
 632         }
 633         vaddr = ion_buffer_kmap_get(buffer);
 634         if (IS_ERR(vaddr))
 635                 return vaddr;
 636         handle->kmap_cnt++;
 637         return vaddr;
 638 }
 639
 640 static void ion_buffer_kmap_put(struct ion_buffer *buffer)
 641 {
 642         buffer->kmap_cnt--;
 643         if (!buffer->kmap_cnt) {
 644                 buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
 645                 buffer->vaddr = NULL;
 646         }
 647 }
 648
 649 static void ion_handle_kmap_put(struct ion_handle *handle)
 650 {
 651         struct ion_buffer *buffer = handle->buffer;
 652
 653         if (!handle->kmap_cnt) {
 654                 WARN(1, "%s: Double unmap detected! bailing...\n", __func__);
 655                 return;
 656         }
 657         handle->kmap_cnt--;
 658         if (!handle->kmap_cnt)
 659                 ion_buffer_kmap_put(buffer);
 660 }
 661
 662 void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
 663 {
 664         struct ion_buffer *buffer;
 665         void *vaddr;
 666
 667         mutex_lock(&client->lock);
 668         if (!ion_handle_validate(client, handle)) {
 669                 pr_err("%s: invalid handle passed to map_kernel.\n",
 670                        __func__);
 671                 mutex_unlock(&client->lock);
 672                 return ERR_PTR(-EINVAL);
 673         }
 674
 675         buffer = handle->buffer;
 676
 677         if (!handle->buffer->heap->ops->map_kernel) {
 678                 pr_err("%s: map_kernel is not implemented by this heap.\n",
 679                        __func__);
 680                 mutex_unlock(&client->lock);
 681                 return ERR_PTR(-ENODEV);
 682         }
 683
 684         mutex_lock(&buffer->lock);
 685         vaddr = ion_handle_kmap_get(handle);
 686         mutex_unlock(&buffer->lock);
 687         mutex_unlock(&client->lock);
 688         return vaddr;
 689 }
 690 EXPORT_SYMBOL(ion_map_kernel);
 691
 692 void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
 693 {
 694         struct ion_buffer *buffer;
 695
 696         mutex_lock(&client->lock);
 697         buffer = handle->buffer;
 698         mutex_lock(&buffer->lock);
 699         ion_handle_kmap_put(handle);
 700         mutex_unlock(&buffer->lock);
 701         mutex_unlock(&client->lock);
 702 }
 703 EXPORT_SYMBOL(ion_unmap_kernel);
 704
 705 static int ion_debug_client_show(struct seq_file *s, void *unused)
 706 {
 707         struct ion_client *client = s->private;
 708         struct rb_node *n;
 709         size_t sizes[ION_NUM_HEAP_IDS] = {0};
 710         const char *names[ION_NUM_HEAP_IDS] = {NULL};
 711         int i;
 712
 713         mutex_lock(&client->lock);
 714         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
 715                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 716                                                      node);
 717                 unsigned int id = handle->buffer->heap->id;
 718
 719                 if (!names[id])
 720                         names[id] = handle->buffer->heap->name;
 721                 sizes[id] += handle->buffer->size;
 722         }
 723         mutex_unlock(&client->lock);
 724
 725         seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
 726         for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
 727                 if (!names[i])
 728                         continue;
 729                 seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
 730         }
 731         return 0;
 732 }
 733
 734 static int ion_debug_client_open(struct inode *inode, struct file *file)
 735 {
 736         return single_open(file, ion_debug_client_show, inode->i_private);
 737 }
 738
 739 static const struct file_operations debug_client_fops = {
 740         .open = ion_debug_client_open,
 741         .read = seq_read,
 742         .llseek = seq_lseek,
 743         .release = single_release,
 744 };
 745
 746 static int ion_get_client_serial(const struct rb_root *root,
 747                                         const unsigned char *name)
 748 {
 749         int serial = -1;
 750         struct rb_node *node;
 751
 752         for (node = rb_first(root); node; node = rb_next(node)) {
 753                 struct ion_client *client = rb_entry(node, struct ion_client,
 754                                                 node);
 755
 756                 if (strcmp(client->name, name))
 757                         continue;
 758                 serial = max(serial, client->display_serial);
 759         }
 760         return serial + 1;
 761 }
 762
 763 struct ion_client *ion_client_create(struct ion_device *dev,
 764                                      const char *name)
 765 {
 766         struct ion_client *client;
 767         struct task_struct *task;
 768         struct rb_node **p;
 769         struct rb_node *parent = NULL;
 770         struct ion_client *entry;
 771         pid_t pid;
 772
 773         if (!name) {
 774                 pr_err("%s: Name cannot be null\n", __func__);
 775                 return ERR_PTR(-EINVAL);
 776         }
 777
 778         get_task_struct(current->group_leader);
 779         task_lock(current->group_leader);
 780         pid = task_pid_nr(current->group_leader);
 781         /*
 782          * don't bother to store task struct for kernel threads,
 783          * they can't be killed anyway
 784          */
 785         if (current->group_leader->flags & PF_KTHREAD) {
 786                 put_task_struct(current->group_leader);
 787                 task = NULL;
 788         } else {
 789                 task = current->group_leader;
 790         }
 791         task_unlock(current->group_leader);
 792
 793         client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
 794         if (!client)
 795                 goto err_put_task_struct;
 796
 797         client->dev = dev;
 798         client->handles = RB_ROOT;
 799         idr_init(&client->idr);
 800         mutex_init(&client->lock);
 801         client->task = task;
 802         client->pid = pid;
 803         client->name = kstrdup(name, GFP_KERNEL);
 804         if (!client->name)
 805                 goto err_free_client;
 806
 807         down_write(&dev->lock);
 808         client->display_serial = ion_get_client_serial(&dev->clients, name);
 809         client->display_name = kasprintf(
 810                 GFP_KERNEL, "%s-%d", name, client->display_serial);
 811         if (!client->display_name) {
 812                 up_write(&dev->lock);
 813                 goto err_free_client_name;
 814         }
 815         p = &dev->clients.rb_node;
 816         while (*p) {
 817                 parent = *p;
 818                 entry = rb_entry(parent, struct ion_client, node);
 819
 820                 if (client < entry)
 821                         p = &(*p)->rb_left;
 822                 else if (client > entry)
 823                         p = &(*p)->rb_right;
 824         }
 825         rb_link_node(&client->node, parent, p);
 826         rb_insert_color(&client->node, &dev->clients);
 827
 828         client->debug_root = debugfs_create_file(client->display_name, 0664,
 829                                                 dev->clients_debug_root,
 830                                                 client, &debug_client_fops);
 831         if (!client->debug_root) {
 832                 char buf[256], *path;
 833
 834                 path = dentry_path(dev->clients_debug_root, buf, 256);
 835                 pr_err("Failed to create client debugfs at %s/%s\n",
 836                         path, client->display_name);
 837         }
 838
 839         up_write(&dev->lock);
 840
 841         return client;
 842
 843 err_free_client_name:
 844         kfree(client->name);
 845 err_free_client:
 846         kfree(client);
 847 err_put_task_struct:
 848         if (task)
 849                 put_task_struct(current->group_leader);
 850         return ERR_PTR(-ENOMEM);
 851 }
 852 EXPORT_SYMBOL(ion_client_create);
 853
 854 void ion_client_destroy(struct ion_client *client)
 855 {
 856         struct ion_device *dev = client->dev;
 857         struct rb_node *n;
 858
 859         pr_debug("%s: %d\n", __func__, __LINE__);
 860         while ((n = rb_first(&client->handles))) {
 861                 struct ion_handle *handle = rb_entry(n, struct ion_handle,
 862                                                      node);
 863                 ion_handle_destroy(&handle->ref);
 864         }
 865
 866         idr_destroy(&client->idr);
 867
 868         down_write(&dev->lock);
 869         if (client->task)
 870                 put_task_struct(client->task);
 871         rb_erase(&client->node, &dev->clients);
 872         debugfs_remove_recursive(client->debug_root);
 873         up_write(&dev->lock);
 874
 875         kfree(client->display_name);
 876         kfree(client->name);
 877         kfree(client);
 878 }
 879 EXPORT_SYMBOL(ion_client_destroy);
 880
 881 struct sg_table *ion_sg_table(struct ion_client *client,
 882                               struct ion_handle *handle)
 883 {
 884         struct ion_buffer *buffer;
 885         struct sg_table *table;
 886
 887         mutex_lock(&client->lock);
 888         if (!ion_handle_validate(client, handle)) {
 889                 pr_err("%s: invalid handle passed to map_dma.\n",
 890                        __func__);
 891                 mutex_unlock(&client->lock);
 892                 return ERR_PTR(-EINVAL);
 893         }
 894         buffer = handle->buffer;
 895         table = buffer->sg_table;
 896         mutex_unlock(&client->lock);
 897         return table;
 898 }
 899 EXPORT_SYMBOL(ion_sg_table);
 900
 901 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 902                                        struct device *dev,
 903                                        enum dma_data_direction direction);
 904
 905 static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
 906                                         enum dma_data_direction direction)
 907 {
 908         struct dma_buf *dmabuf = attachment->dmabuf;
 909         struct ion_buffer *buffer = dmabuf->priv;
 910
 911         ion_buffer_sync_for_device(buffer, attachment->dev, direction);
 912         return buffer->sg_table;
 913 }
 914
 915 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
 916                               struct sg_table *table,
 917                               enum dma_data_direction direction)
 918 {
 919 }
 920
 921 void ion_pages_sync_for_device(struct device *dev, struct page *page,
 922                 size_t size, enum dma_data_direction dir)
 923 {
 924         struct scatterlist sg;
 925
 926         sg_init_table(&sg, 1);
 927         sg_set_page(&sg, page, size, 0);
 928         /*
 929          * This is not correct - sg_dma_address needs a dma_addr_t that is valid
 930          * for the targeted device, but this works on the currently targeted
 931          * hardware.
 932          */
 933         sg_dma_address(&sg) = page_to_phys(page);
 934         dma_sync_sg_for_device(dev, &sg, 1, dir);
 935 }
 936
 937 struct ion_vma_list {
 938         struct list_head list;
 939         struct vm_area_struct *vma;
 940 };
 941
 942 static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
 943                                        struct device *dev,
 944                                        enum dma_data_direction dir)
 945 {
 946         struct ion_vma_list *vma_list;
 947         int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 948         int i;
 949
 950         pr_debug("%s: syncing for device %s\n", __func__,
 951                  dev ? dev_name(dev) : "null");
 952
 953         if (!ion_buffer_fault_user_mappings(buffer))
 954                 return;
 955
 956         mutex_lock(&buffer->lock);
 957         for (i = 0; i < pages; i++) {
 958                 struct page *page = buffer->pages[i];
 959
 960                 if (ion_buffer_page_is_dirty(page))
 961                         ion_pages_sync_for_device(dev, ion_buffer_page(page),
 962                                                         PAGE_SIZE, dir);
 963
 964                 ion_buffer_page_clean(buffer->pages + i);
 965         }
 966         list_for_each_entry(vma_list, &buffer->vmas, list) {
 967                 struct vm_area_struct *vma = vma_list->vma;
 968
 969                 zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
 970                                NULL);
 971         }
 972         mutex_unlock(&buffer->lock);
 973 }
 974
 975 static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 976 {
 977         struct ion_buffer *buffer = vma->vm_private_data;
 978         unsigned long pfn;
 979         int ret;
 980
 981         mutex_lock(&buffer->lock);
 982         ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
 983         BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
 984
 985         pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
 986         ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
 987         mutex_unlock(&buffer->lock);
 988         if (ret)
 989                 return VM_FAULT_ERROR;
 990
 991         return VM_FAULT_NOPAGE;
 992 }
 993
 994 static void ion_vm_open(struct vm_area_struct *vma)
 995 {
 996         struct ion_buffer *buffer = vma->vm_private_data;
 997         struct ion_vma_list *vma_list;
 998
 999         vma_list = kmalloc(sizeof(struct ion_vma_list), GFP_KERNEL);
1000         if (!vma_list)
1001                 return;
1002         vma_list->vma = vma;
1003         mutex_lock(&buffer->lock);
1004         list_add(&vma_list->list, &buffer->vmas);
1005         mutex_unlock(&buffer->lock);
1006         pr_debug("%s: adding %p\n", __func__, vma);
1007 }
1008
1009 static void ion_vm_close(struct vm_area_struct *vma)
1010 {
1011         struct ion_buffer *buffer = vma->vm_private_data;
1012         struct ion_vma_list *vma_list, *tmp;
1013
1014         pr_debug("%s\n", __func__);
1015         mutex_lock(&buffer->lock);
1016         list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
1017                 if (vma_list->vma != vma)
1018                         continue;
1019                 list_del(&vma_list->list);
1020                 kfree(vma_list);
1021                 pr_debug("%s: deleting %p\n", __func__, vma);
1022                 break;
1023         }
1024         mutex_unlock(&buffer->lock);
1025 }
1026
1027 static const struct vm_operations_struct ion_vma_ops = {
1028         .open = ion_vm_open,
1029         .close = ion_vm_close,
1030         .fault = ion_vm_fault,
1031 };
1032
1033 static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
1034 {
1035         struct ion_buffer *buffer = dmabuf->priv;
1036         int ret = 0;
1037
1038         if (!buffer->heap->ops->map_user) {
1039                 pr_err("%s: this heap does not define a method for mapping to userspace\n",
1040                         __func__);
1041                 return -EINVAL;
1042         }
1043
1044         if (ion_buffer_fault_user_mappings(buffer)) {
1045                 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
1046                                                         VM_DONTDUMP;
1047                 vma->vm_private_data = buffer;
1048                 vma->vm_ops = &ion_vma_ops;
1049                 ion_vm_open(vma);
1050                 return 0;
1051         }
1052
1053         if (!(buffer->flags & ION_FLAG_CACHED))
1054                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
1055
1056         mutex_lock(&buffer->lock);
1057         /* now map it to userspace */
1058         ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
1059         mutex_unlock(&buffer->lock);
1060
1061         if (ret)
1062                 pr_err("%s: failure mapping buffer to userspace\n",
1063                        __func__);
1064
1065         return ret;
1066 }
1067
1068 static void ion_dma_buf_release(struct dma_buf *dmabuf)
1069 {
1070         struct ion_buffer *buffer = dmabuf->priv;
1071
1072         ion_buffer_put(buffer);
1073 }
1074
1075 static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
1076 {
1077         struct ion_buffer *buffer = dmabuf->priv;
1078
1079         return buffer->vaddr + offset * PAGE_SIZE;
1080 }
1081
1082 static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
1083                                void *ptr)
1084 {
1085 }
1086
1087 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
1088                                         size_t len,
1089                                         enum dma_data_direction direction)
1090 {
1091         struct ion_buffer *buffer = dmabuf->priv;
1092         void *vaddr;
1093
1094         if (!buffer->heap->ops->map_kernel) {
1095                 pr_err("%s: map kernel is not implemented by this heap.\n",
1096                        __func__);
1097                 return -ENODEV;
1098         }
1099
1100         mutex_lock(&buffer->lock);
1101         vaddr = ion_buffer_kmap_get(buffer);
1102         mutex_unlock(&buffer->lock);
1103         return PTR_ERR_OR_ZERO(vaddr);
1104 }
1105
1106 static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
1107                                        size_t len,
1108                                        enum dma_data_direction direction)
1109 {
1110         struct ion_buffer *buffer = dmabuf->priv;
1111
1112         mutex_lock(&buffer->lock);
1113         ion_buffer_kmap_put(buffer);
1114         mutex_unlock(&buffer->lock);
1115 }
1116
1117 static struct dma_buf_ops dma_buf_ops = {
1118         .map_dma_buf = ion_map_dma_buf,
1119         .unmap_dma_buf = ion_unmap_dma_buf,
1120         .mmap = ion_mmap,
1121         .release = ion_dma_buf_release,
1122         .begin_cpu_access = ion_dma_buf_begin_cpu_access,
1123         .end_cpu_access = ion_dma_buf_end_cpu_access,
1124         .kmap_atomic = ion_dma_buf_kmap,
1125         .kunmap_atomic = ion_dma_buf_kunmap,
1126         .kmap = ion_dma_buf_kmap,
1127         .kunmap = ion_dma_buf_kunmap,
1128 };
1129
1130 struct dma_buf *ion_share_dma_buf(struct ion_client *client,
1131                                                 struct ion_handle *handle)
1132 {
1133         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1134         struct ion_buffer *buffer;
1135         struct dma_buf *dmabuf;
1136         bool valid_handle;
1137
1138         mutex_lock(&client->lock);
1139         valid_handle = ion_handle_validate(client, handle);
1140         if (!valid_handle) {
1141                 WARN(1, "%s: invalid handle passed to share.\n", __func__);
1142                 mutex_unlock(&client->lock);
1143                 return ERR_PTR(-EINVAL);
1144         }
1145         buffer = handle->buffer;
1146         ion_buffer_get(buffer);
1147         mutex_unlock(&client->lock);
1148
1149         exp_info.ops = &dma_buf_ops;
1150         exp_info.size = buffer->size;
1151         exp_info.flags = O_RDWR;
1152         exp_info.priv = buffer;
1153
1154         dmabuf = dma_buf_export(&exp_info);
1155         if (IS_ERR(dmabuf)) {
1156                 ion_buffer_put(buffer);
1157                 return dmabuf;
1158         }
1159
1160         return dmabuf;
1161 }
1162 EXPORT_SYMBOL(ion_share_dma_buf);
1163
1164 int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
1165 {
1166         struct dma_buf *dmabuf;
1167         int fd;
1168
1169         dmabuf = ion_share_dma_buf(client, handle);
1170         if (IS_ERR(dmabuf))
1171                 return PTR_ERR(dmabuf);
1172
1173         fd = dma_buf_fd(dmabuf, O_CLOEXEC);
1174         if (fd < 0)
1175                 dma_buf_put(dmabuf);
1176
1177         return fd;
1178 }
1179 EXPORT_SYMBOL(ion_share_dma_buf_fd);
1180
1181 struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
1182 {
1183         struct dma_buf *dmabuf;
1184         struct ion_buffer *buffer;
1185         struct ion_handle *handle;
1186         int ret;
1187
1188         dmabuf = dma_buf_get(fd);
1189         if (IS_ERR(dmabuf))
1190                 return ERR_CAST(dmabuf);
1191         /* if this memory came from ion */
1192
1193         if (dmabuf->ops != &dma_buf_ops) {
1194                 pr_err("%s: can not import dmabuf from another exporter\n",
1195                        __func__);
1196                 dma_buf_put(dmabuf);
1197                 return ERR_PTR(-EINVAL);
1198         }
1199         buffer = dmabuf->priv;
1200
1201         mutex_lock(&client->lock);
1202         /* if a handle exists for this buffer just take a reference to it */
1203         handle = ion_handle_lookup(client, buffer);
1204         if (!IS_ERR(handle)) {
1205                 ion_handle_get(handle);
1206                 mutex_unlock(&client->lock);
1207                 goto end;
1208         }
1209
1210         handle = ion_handle_create(client, buffer);
1211         if (IS_ERR(handle)) {
1212                 mutex_unlock(&client->lock);
1213                 goto end;
1214         }
1215
1216         ret = ion_handle_add(client, handle);
1217         mutex_unlock(&client->lock);
1218         if (ret) {
1219                 ion_handle_put(handle);
1220                 handle = ERR_PTR(ret);
1221         }
1222
1223 end:
1224         dma_buf_put(dmabuf);
1225         return handle;
1226 }
1227 EXPORT_SYMBOL(ion_import_dma_buf);
1228
1229 static int ion_sync_for_device(struct ion_client *client, int fd)
1230 {
1231         struct dma_buf *dmabuf;
1232         struct ion_buffer *buffer;
1233
1234         dmabuf = dma_buf_get(fd);
1235         if (IS_ERR(dmabuf))
1236                 return PTR_ERR(dmabuf);
1237
1238         /* if this memory came from ion */
1239         if (dmabuf->ops != &dma_buf_ops) {
1240                 pr_err("%s: can not sync dmabuf from another exporter\n",
1241                        __func__);
1242                 dma_buf_put(dmabuf);
1243                 return -EINVAL;
1244         }
1245         buffer = dmabuf->priv;
1246
1247         dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
1248                                buffer->sg_table->nents, DMA_BIDIRECTIONAL);
1249         dma_buf_put(dmabuf);
1250         return 0;
1251 }
1252
1253 /* fix up the cases where the ioctl direction bits are incorrect */
1254 static unsigned int ion_ioctl_dir(unsigned int cmd)
1255 {
1256         switch (cmd) {
1257         case ION_IOC_SYNC:
1258         case ION_IOC_FREE:
1259         case ION_IOC_CUSTOM:
1260                 return _IOC_WRITE;
1261         default:
1262                 return _IOC_DIR(cmd);
1263         }
1264 }
1265
1266 static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1267 {
1268         struct ion_client *client = filp->private_data;
1269         struct ion_device *dev = client->dev;
1270         struct ion_handle *cleanup_handle = NULL;
1271         int ret = 0;
1272         unsigned int dir;
1273
1274         union {
1275                 struct ion_fd_data fd;
1276                 struct ion_allocation_data allocation;
1277                 struct ion_handle_data handle;
1278                 struct ion_custom_data custom;
1279         } data;
1280
1281         dir = ion_ioctl_dir(cmd);
1282
1283         if (_IOC_SIZE(cmd) > sizeof(data))
1284                 return -EINVAL;
1285
1286         if (dir & _IOC_WRITE)
1287                 if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
1288                         return -EFAULT;
1289
1290         switch (cmd) {
1291         case ION_IOC_ALLOC:
1292         {
1293                 struct ion_handle *handle;
1294
1295                 handle = ion_alloc(client, data.allocation.len,
1296                                                 data.allocation.align,
1297                                                 data.allocation.heap_id_mask,
1298                                                 data.allocation.flags);
1299                 if (IS_ERR(handle))
1300                         return PTR_ERR(handle);
1301
1302                 data.allocation.handle = handle->id;
1303
1304                 cleanup_handle = handle;
1305                 break;
1306         }
1307         case ION_IOC_FREE:
1308         {
1309                 struct ion_handle *handle;
1310
1311                 mutex_lock(&client->lock);
1312                 handle = ion_handle_get_by_id_nolock(client, data.handle.handle);
1313                 if (IS_ERR(handle)) {
1314                         mutex_unlock(&client->lock);
1315                         return PTR_ERR(handle);
1316                 }
1317                 ion_free_nolock(client, handle);
1318                 ion_handle_put_nolock(handle);
1319                 mutex_unlock(&client->lock);
1320                 break;
1321         }
1322         case ION_IOC_SHARE:
1323         case ION_IOC_MAP:
1324         {
1325                 struct ion_handle *handle;
1326
1327                 handle = ion_handle_get_by_id(client, data.handle.handle);
1328                 if (IS_ERR(handle))
1329                         return PTR_ERR(handle);
1330                 data.fd.fd = ion_share_dma_buf_fd(client, handle);
1331                 ion_handle_put(handle);
1332                 if (data.fd.fd < 0)
1333                         ret = data.fd.fd;
1334                 break;
1335         }
1336         case ION_IOC_IMPORT:
1337         {
1338                 struct ion_handle *handle;
1339
1340                 handle = ion_import_dma_buf(client, data.fd.fd);
1341                 if (IS_ERR(handle))
1342                         ret = PTR_ERR(handle);
1343                 else
1344                         data.handle.handle = handle->id;
1345                 break;
1346         }
1347         case ION_IOC_SYNC:
1348         {
1349                 ret = ion_sync_for_device(client, data.fd.fd);
1350                 break;
1351         }
1352         case ION_IOC_CUSTOM:
1353         {
1354                 if (!dev->custom_ioctl)
1355                         return -ENOTTY;
1356                 ret = dev->custom_ioctl(client, data.custom.cmd,
1357                                                 data.custom.arg);
1358                 break;
1359         }
1360         default:
1361                 return -ENOTTY;
1362         }
1363
1364         if (dir & _IOC_READ) {
1365                 if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
1366                         if (cleanup_handle)
1367                                 ion_free(client, cleanup_handle);
1368                         return -EFAULT;
1369                 }
1370         }
1371         return ret;
1372 }
1373
1374 static int ion_release(struct inode *inode, struct file *file)
1375 {
1376         struct ion_client *client = file->private_data;
1377
1378         pr_debug("%s: %d\n", __func__, __LINE__);
1379         ion_client_destroy(client);
1380         return 0;
1381 }
1382
1383 static int ion_open(struct inode *inode, struct file *file)
1384 {
1385         struct miscdevice *miscdev = file->private_data;
1386         struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
1387         struct ion_client *client;
1388         char debug_name[64];
1389
1390         pr_debug("%s: %d\n", __func__, __LINE__);
1391         snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
1392         client = ion_client_create(dev, debug_name);
1393         if (IS_ERR(client))
1394                 return PTR_ERR(client);
1395         file->private_data = client;
1396
1397         return 0;
1398 }
1399
1400 static const struct file_operations ion_fops = {
1401         .owner          = THIS_MODULE,
1402         .open           = ion_open,
1403         .release        = ion_release,
1404         .unlocked_ioctl = ion_ioctl,
1405         .compat_ioctl   = compat_ion_ioctl,
1406 };
1407
1408 static size_t ion_debug_heap_total(struct ion_client *client,
1409                                    unsigned int id)
1410 {
1411         size_t size = 0;
1412         struct rb_node *n;
1413
1414         mutex_lock(&client->lock);
1415         for (n = rb_first(&client->handles); n; n = rb_next(n)) {
1416                 struct ion_handle *handle = rb_entry(n,
1417                                                      struct ion_handle,
1418                                                      node);
1419                 if (handle->buffer->heap->id == id)
1420                         size += handle->buffer->size;
1421         }
1422         mutex_unlock(&client->lock);
1423         return size;
1424 }
1425
1426 static int ion_debug_heap_show(struct seq_file *s, void *unused)
1427 {
1428         struct ion_heap *heap = s->private;
1429         struct ion_device *dev = heap->dev;
1430         struct rb_node *n;
1431         size_t total_size = 0;
1432         size_t total_orphaned_size = 0;
1433
1434         seq_printf(s, "%16s %16s %16s\n", "client", "pid", "size");
1435         seq_puts(s, "----------------------------------------------------\n");
1436
1437         for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
1438                 struct ion_client *client = rb_entry(n, struct ion_client,
1439                                                      node);
1440                 size_t size = ion_debug_heap_total(client, heap->id);
1441
1442                 if (!size)
1443                         continue;
1444                 if (client->task) {
1445                         char task_comm[TASK_COMM_LEN];
1446
1447                         get_task_comm(task_comm, client->task);
1448                         seq_printf(s, "%16s %16u %16zu\n", task_comm,
1449                                    client->pid, size);
1450                 } else {
1451                         seq_printf(s, "%16s %16u %16zu\n", client->name,
1452                                    client->pid, size);
1453                 }
1454         }
1455         seq_puts(s, "----------------------------------------------------\n");
1456         seq_puts(s, "orphaned allocations (info is from last known client):\n");
1457         mutex_lock(&dev->buffer_lock);
1458         for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
1459                 struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
1460                                                      node);
1461                 if (buffer->heap->id != heap->id)
1462                         continue;
1463                 total_size += buffer->size;
1464                 if (!buffer->handle_count) {
1465                         seq_printf(s, "%16s %16u %16zu %d %d\n",
1466                                    buffer->task_comm, buffer->pid,
1467                                    buffer->size, buffer->kmap_cnt,
1468                                    atomic_read(&buffer->ref.refcount));
1469                         total_orphaned_size += buffer->size;
1470                 }
1471         }
1472         mutex_unlock(&dev->buffer_lock);
1473         seq_puts(s, "----------------------------------------------------\n");
1474         seq_printf(s, "%16s %16zu\n", "total orphaned",
1475                    total_orphaned_size);
1476         seq_printf(s, "%16s %16zu\n", "total ", total_size);
1477         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1478                 seq_printf(s, "%16s %16zu\n", "deferred free",
1479                                 heap->free_list_size);
1480         seq_puts(s, "----------------------------------------------------\n");
1481
1482         if (heap->debug_show)
1483                 heap->debug_show(heap, s, unused);
1484
1485         return 0;
1486 }
1487
1488 static int ion_debug_heap_open(struct inode *inode, struct file *file)
1489 {
1490         return single_open(file, ion_debug_heap_show, inode->i_private);
1491 }
1492
1493 static const struct file_operations debug_heap_fops = {
1494         .open = ion_debug_heap_open,
1495         .read = seq_read,
1496         .llseek = seq_lseek,
1497         .release = single_release,
1498 };
1499
1500 static int debug_shrink_set(void *data, u64 val)
1501 {
1502         struct ion_heap *heap = data;
1503         struct shrink_control sc;
1504         int objs;
1505
1506         sc.gfp_mask = -1;
1507         sc.nr_to_scan = val;
1508
1509         if (!val) {
1510                 objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1511                 sc.nr_to_scan = objs;
1512         }
1513
1514         heap->shrinker.scan_objects(&heap->shrinker, &sc);
1515         return 0;
1516 }
1517
1518 static int debug_shrink_get(void *data, u64 *val)
1519 {
1520         struct ion_heap *heap = data;
1521         struct shrink_control sc;
1522         int objs;
1523
1524         sc.gfp_mask = -1;
1525         sc.nr_to_scan = 0;
1526
1527         objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
1528         *val = objs;
1529         return 0;
1530 }
1531
1532 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
1533                         debug_shrink_set, "%llu\n");
1534
1535 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
1536 {
1537         struct dentry *debug_file;
1538
1539         if (!heap->ops->allocate || !heap->ops->free || !heap->ops->map_dma ||
1540             !heap->ops->unmap_dma)
1541                 pr_err("%s: can not add heap with invalid ops struct.\n",
1542                        __func__);
1543
1544         spin_lock_init(&heap->free_lock);
1545         heap->free_list_size = 0;
1546
1547         if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
1548                 ion_heap_init_deferred_free(heap);
1549
1550         if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
1551                 ion_heap_init_shrinker(heap);
1552
1553         heap->dev = dev;
1554         down_write(&dev->lock);
1555         /*
1556          * use negative heap->id to reverse the priority -- when traversing
1557          * the list later attempt higher id numbers first
1558          */
1559         plist_node_init(&heap->node, -heap->id);
1560         plist_add(&heap->node, &dev->heaps);
1561         debug_file = debugfs_create_file(heap->name, 0664,
1562                                         dev->heaps_debug_root, heap,
1563                                         &debug_heap_fops);
1564
1565         if (!debug_file) {
1566                 char buf[256], *path;
1567
1568                 path = dentry_path(dev->heaps_debug_root, buf, 256);
1569                 pr_err("Failed to create heap debugfs at %s/%s\n",
1570                         path, heap->name);
1571         }
1572
1573         if (heap->shrinker.count_objects && heap->shrinker.scan_objects) {
1574                 char debug_name[64];
1575
1576                 snprintf(debug_name, 64, "%s_shrink", heap->name);
1577                 debug_file = debugfs_create_file(
1578                         debug_name, 0644, dev->heaps_debug_root, heap,
1579                         &debug_shrink_fops);
1580                 if (!debug_file) {
1581                         char buf[256], *path;
1582
1583                         path = dentry_path(dev->heaps_debug_root, buf, 256);
1584                         pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
1585                                 path, debug_name);
1586                 }
1587         }
1588
1589         up_write(&dev->lock);
1590 }
1591 EXPORT_SYMBOL(ion_device_add_heap);
1592
1593 struct ion_device *ion_device_create(long (*custom_ioctl)
1594                                      (struct ion_client *client,
1595                                       unsigned int cmd,
1596                                       unsigned long arg))
1597 {
1598         struct ion_device *idev;
1599         int ret;
1600
1601         idev = kzalloc(sizeof(struct ion_device), GFP_KERNEL);
1602         if (!idev)
1603                 return ERR_PTR(-ENOMEM);
1604
1605         idev->dev.minor = MISC_DYNAMIC_MINOR;
1606         idev->dev.name = "ion";
1607         idev->dev.fops = &ion_fops;
1608         idev->dev.parent = NULL;
1609         ret = misc_register(&idev->dev);
1610         if (ret) {
1611                 pr_err("ion: failed to register misc device.\n");
1612                 kfree(idev);
1613                 return ERR_PTR(ret);
1614         }
1615
1616         idev->debug_root = debugfs_create_dir("ion", NULL);
1617         if (!idev->debug_root) {
1618                 pr_err("ion: failed to create debugfs root directory.\n");
1619                 goto debugfs_done;
1620         }
1621         idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
1622         if (!idev->heaps_debug_root) {
1623                 pr_err("ion: failed to create debugfs heaps directory.\n");
1624                 goto debugfs_done;
1625         }
1626         idev->clients_debug_root = debugfs_create_dir("clients",
1627                                                 idev->debug_root);
1628         if (!idev->clients_debug_root)
1629                 pr_err("ion: failed to create debugfs clients directory.\n");
1630
1631 debugfs_done:
1632
1633         idev->custom_ioctl = custom_ioctl;
1634         idev->buffers = RB_ROOT;
1635         mutex_init(&idev->buffer_lock);
1636         init_rwsem(&idev->lock);
1637         plist_head_init(&idev->heaps);
1638         idev->clients = RB_ROOT;
1639         return idev;
1640 }
1641 EXPORT_SYMBOL(ion_device_create);
1642
1643 void ion_device_destroy(struct ion_device *dev)
1644 {
1645         misc_deregister(&dev->dev);
1646         debugfs_remove_recursive(dev->debug_root);
1647         /* XXX need to free the heaps and clients ? */
1648         kfree(dev);
1649 }
1650 EXPORT_SYMBOL(ion_device_destroy);
1651
1652 void __init ion_reserve(struct ion_platform_data *data)
1653 {
1654         int i;
1655
1656         for (i = 0; i < data->nr; i++) {
1657                 if (data->heaps[i].size == 0)
1658                         continue;
1659
1660                 if (data->heaps[i].base == 0) {
1661                         phys_addr_t paddr;
1662
1663                         paddr = memblock_alloc_base(data->heaps[i].size,
1664                                                     data->heaps[i].align,
1665                                                     MEMBLOCK_ALLOC_ANYWHERE);
1666                         if (!paddr) {
1667                                 pr_err("%s: error allocating memblock for heap %d\n",
1668                                         __func__, i);
1669                                 continue;
1670                         }
1671                         data->heaps[i].base = paddr;
1672                 } else {
1673                         int ret = memblock_reserve(data->heaps[i].base,
1674                                                data->heaps[i].size);
1675                         if (ret)
1676                                 pr_err("memblock reserve of %zx@%lx failed\n",
1677                                        data->heaps[i].size,
1678                                        data->heaps[i].base);
1679                 }
1680                 pr_info("%s: %s reserved base %lx size %zu\n", __func__,
1681                         data->heaps[i].name,
1682                         data->heaps[i].base,
1683                         data->heaps[i].size);
1684         }
1685 }