drivers/staging/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 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 <asm/cacheflush.h>
  19 #include <linux/fdtable.h>
  20 #include <linux/file.h>
  21 #include <linux/fs.h>
  22 #include <linux/list.h>
  23 #include <linux/miscdevice.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/mutex.h>
  27 #include <linux/nsproxy.h>
  28 #include <linux/poll.h>
  29 #include <linux/debugfs.h>
  30 #include <linux/rbtree.h>
  31 #include <linux/sched.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/slab.h>
  36
  37 #include "binder.h"
  38
  39 static DEFINE_MUTEX(binder_lock);
  40 static DEFINE_MUTEX(binder_deferred_lock);
  41 static DEFINE_MUTEX(binder_mmap_lock);
  42
  43 static HLIST_HEAD(binder_procs);
  44 static HLIST_HEAD(binder_deferred_list);
  45 static HLIST_HEAD(binder_dead_nodes);
  46
  47 static struct dentry *binder_debugfs_dir_entry_root;
  48 static struct dentry *binder_debugfs_dir_entry_proc;
  49 static struct binder_node *binder_context_mgr_node;
  50 static uid_t binder_context_mgr_uid = -1;
  51 static int binder_last_id;
  52 static struct workqueue_struct *binder_deferred_workqueue;
  53
  54 #define BINDER_DEBUG_ENTRY(name) \
  55 static int binder_##name##_open(struct inode *inode, struct file *file) \
  56 { \
  57         return single_open(file, binder_##name##_show, inode->i_private); \
  58 } \
  59 \
  60 static const struct file_operations binder_##name##_fops = { \
  61         .owner = THIS_MODULE, \
  62         .open = binder_##name##_open, \
  63         .read = seq_read, \
  64         .llseek = seq_lseek, \
  65         .release = single_release, \
  66 }
  67
  68 static int binder_proc_show(struct seq_file *m, void *unused);
  69 BINDER_DEBUG_ENTRY(proc);
  70
  71 /* This is only defined in include/asm-arm/sizes.h */
  72 #ifndef SZ_1K
  73 #define SZ_1K                               0x400
  74 #endif
  75
  76 #ifndef SZ_4M
  77 #define SZ_4M                               0x400000
  78 #endif
  79
  80 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  81
  82 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  83
  84 enum {
  85         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  86         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  87         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  88         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  89         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  90         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
  91         BINDER_DEBUG_READ_WRITE             = 1U << 6,
  92         BINDER_DEBUG_USER_REFS              = 1U << 7,
  93         BINDER_DEBUG_THREADS                = 1U << 8,
  94         BINDER_DEBUG_TRANSACTION            = 1U << 9,
  95         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
  96         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
  97         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
  98         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
  99         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 100         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 101 };
 102 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 103         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 104 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 105
 106 static bool binder_debug_no_lock;
 107 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 108
 109 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 110 static int binder_stop_on_user_error;
 111
 112 static int binder_set_stop_on_user_error(const char *val,
 113                                          struct kernel_param *kp)
 114 {
 115         int ret;
 116         ret = param_set_int(val, kp);
 117         if (binder_stop_on_user_error < 2)
 118                 wake_up(&binder_user_error_wait);
 119         return ret;
 120 }
 121 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 122         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 123
 124 #define binder_debug(mask, x...) \
 125         do { \
 126                 if (binder_debug_mask & mask) \
 127                         pr_info(x); \
 128         } while (0)
 129
 130 #define binder_user_error(x...) \
 131         do { \
 132                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 133                         pr_info(x); \
 134                 if (binder_stop_on_user_error) \
 135                         binder_stop_on_user_error = 2; \
 136         } while (0)
 137
 138 enum binder_stat_types {
 139         BINDER_STAT_PROC,
 140         BINDER_STAT_THREAD,
 141         BINDER_STAT_NODE,
 142         BINDER_STAT_REF,
 143         BINDER_STAT_DEATH,
 144         BINDER_STAT_TRANSACTION,
 145         BINDER_STAT_TRANSACTION_COMPLETE,
 146         BINDER_STAT_COUNT
 147 };
 148
 149 struct binder_stats {
 150         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 151         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 152         int obj_created[BINDER_STAT_COUNT];
 153         int obj_deleted[BINDER_STAT_COUNT];
 154 };
 155
 156 static struct binder_stats binder_stats;
 157
 158 static inline void binder_stats_deleted(enum binder_stat_types type)
 159 {
 160         binder_stats.obj_deleted[type]++;
 161 }
 162
 163 static inline void binder_stats_created(enum binder_stat_types type)
 164 {
 165         binder_stats.obj_created[type]++;
 166 }
 167
 168 struct binder_transaction_log_entry {
 169         int debug_id;
 170         int call_type;
 171         int from_proc;
 172         int from_thread;
 173         int target_handle;
 174         int to_proc;
 175         int to_thread;
 176         int to_node;
 177         int data_size;
 178         int offsets_size;
 179 };
 180 struct binder_transaction_log {
 181         int next;
 182         int full;
 183         struct binder_transaction_log_entry entry[32];
 184 };
 185 static struct binder_transaction_log binder_transaction_log;
 186 static struct binder_transaction_log binder_transaction_log_failed;
 187
 188 static struct binder_transaction_log_entry *binder_transaction_log_add(
 189         struct binder_transaction_log *log)
 190 {
 191         struct binder_transaction_log_entry *e;
 192         e = &log->entry[log->next];
 193         memset(e, 0, sizeof(*e));
 194         log->next++;
 195         if (log->next == ARRAY_SIZE(log->entry)) {
 196                 log->next = 0;
 197                 log->full = 1;
 198         }
 199         return e;
 200 }
 201
 202 struct binder_work {
 203         struct list_head entry;
 204         enum {
 205                 BINDER_WORK_TRANSACTION = 1,
 206                 BINDER_WORK_TRANSACTION_COMPLETE,
 207                 BINDER_WORK_NODE,
 208                 BINDER_WORK_DEAD_BINDER,
 209                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 210                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 211         } type;
 212 };
 213
 214 struct binder_node {
 215         int debug_id;
 216         struct binder_work work;
 217         union {
 218                 struct rb_node rb_node;
 219                 struct hlist_node dead_node;
 220         };
 221         struct binder_proc *proc;
 222         struct hlist_head refs;
 223         int internal_strong_refs;
 224         int local_weak_refs;
 225         int local_strong_refs;
 226         void __user *ptr;
 227         void __user *cookie;
 228         unsigned has_strong_ref:1;
 229         unsigned pending_strong_ref:1;
 230         unsigned has_weak_ref:1;
 231         unsigned pending_weak_ref:1;
 232         unsigned has_async_transaction:1;
 233         unsigned accept_fds:1;
 234         unsigned min_priority:8;
 235         struct list_head async_todo;
 236 };
 237
 238 struct binder_ref_death {
 239         struct binder_work work;
 240         void __user *cookie;
 241 };
 242
 243 struct binder_ref {
 244         /* Lookups needed: */
 245         /*   node + proc => ref (transaction) */
 246         /*   desc + proc => ref (transaction, inc/dec ref) */
 247         /*   node => refs + procs (proc exit) */
 248         int debug_id;
 249         struct rb_node rb_node_desc;
 250         struct rb_node rb_node_node;
 251         struct hlist_node node_entry;
 252         struct binder_proc *proc;
 253         struct binder_node *node;
 254         uint32_t desc;
 255         int strong;
 256         int weak;
 257         struct binder_ref_death *death;
 258 };
 259
 260 struct binder_buffer {
 261         struct list_head entry; /* free and allocated entries by address */
 262         struct rb_node rb_node; /* free entry by size or allocated entry */
 263                                 /* by address */
 264         unsigned free:1;
 265         unsigned allow_user_free:1;
 266         unsigned async_transaction:1;
 267         unsigned debug_id:29;
 268
 269         struct binder_transaction *transaction;
 270
 271         struct binder_node *target_node;
 272         size_t data_size;
 273         size_t offsets_size;
 274         uint8_t data[0];
 275 };
 276
 277 enum binder_deferred_state {
 278         BINDER_DEFERRED_PUT_FILES    = 0x01,
 279         BINDER_DEFERRED_FLUSH        = 0x02,
 280         BINDER_DEFERRED_RELEASE      = 0x04,
 281 };
 282
 283 struct binder_proc {
 284         struct hlist_node proc_node;
 285         struct rb_root threads;
 286         struct rb_root nodes;
 287         struct rb_root refs_by_desc;
 288         struct rb_root refs_by_node;
 289         int pid;
 290         struct vm_area_struct *vma;
 291         struct mm_struct *vma_vm_mm;
 292         struct task_struct *tsk;
 293         struct files_struct *files;
 294         struct hlist_node deferred_work_node;
 295         int deferred_work;
 296         void *buffer;
 297         ptrdiff_t user_buffer_offset;
 298
 299         struct list_head buffers;
 300         struct rb_root free_buffers;
 301         struct rb_root allocated_buffers;
 302         size_t free_async_space;
 303
 304         struct page **pages;
 305         size_t buffer_size;
 306         uint32_t buffer_free;
 307         struct list_head todo;
 308         wait_queue_head_t wait;
 309         struct binder_stats stats;
 310         struct list_head delivered_death;
 311         int max_threads;
 312         int requested_threads;
 313         int requested_threads_started;
 314         int ready_threads;
 315         long default_priority;
 316         struct dentry *debugfs_entry;
 317 };
 318
 319 enum {
 320         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 321         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 322         BINDER_LOOPER_STATE_EXITED      = 0x04,
 323         BINDER_LOOPER_STATE_INVALID     = 0x08,
 324         BINDER_LOOPER_STATE_WAITING     = 0x10,
 325         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 326 };
 327
 328 struct binder_thread {
 329         struct binder_proc *proc;
 330         struct rb_node rb_node;
 331         int pid;
 332         int looper;
 333         struct binder_transaction *transaction_stack;
 334         struct list_head todo;
 335         uint32_t return_error; /* Write failed, return error code in read buf */
 336         uint32_t return_error2; /* Write failed, return error code in read */
 337                 /* buffer. Used when sending a reply to a dead process that */
 338                 /* we are also waiting on */
 339         wait_queue_head_t wait;
 340         struct binder_stats stats;
 341 };
 342
 343 struct binder_transaction {
 344         int debug_id;
 345         struct binder_work work;
 346         struct binder_thread *from;
 347         struct binder_transaction *from_parent;
 348         struct binder_proc *to_proc;
 349         struct binder_thread *to_thread;
 350         struct binder_transaction *to_parent;
 351         unsigned need_reply:1;
 352         /* unsigned is_dead:1; */       /* not used at the moment */
 353
 354         struct binder_buffer *buffer;
 355         unsigned int    code;
 356         unsigned int    flags;
 357         long    priority;
 358         long    saved_priority;
 359         uid_t   sender_euid;
 360 };
 361
 362 static void
 363 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 364
 365 int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 366 {
 367         struct files_struct *files = proc->files;
 368         unsigned long rlim_cur;
 369         unsigned long irqs;
 370
 371         if (files == NULL)
 372                 return -ESRCH;
 373
 374         if (!lock_task_sighand(proc->tsk, &irqs))
 375                 return -EMFILE;
 376
 377         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 378         unlock_task_sighand(proc->tsk, &irqs);
 379
 380         return __alloc_fd(files, 0, rlim_cur, flags);
 381 }
 382
 383 /*
 384  * copied from fd_install
 385  */
 386 static void task_fd_install(
 387         struct binder_proc *proc, unsigned int fd, struct file *file)
 388 {
 389         struct files_struct *files = proc->files;
 390         struct fdtable *fdt;
 391
 392         if (files == NULL)
 393                 return;
 394
 395         spin_lock(&files->file_lock);
 396         fdt = files_fdtable(files);
 397         BUG_ON(fdt->fd[fd] != NULL);
 398         rcu_assign_pointer(fdt->fd[fd], file);
 399         spin_unlock(&files->file_lock);
 400 }
 401
 402 /*
 403  * copied from __put_unused_fd in open.c
 404  */
 405 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 406 {
 407         struct fdtable *fdt = files_fdtable(files);
 408         __clear_open_fd(fd, fdt);
 409         if (fd < files->next_fd)
 410                 files->next_fd = fd;
 411 }
 412
 413 /*
 414  * copied from sys_close
 415  */
 416 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 417 {
 418         struct file *filp;
 419         struct files_struct *files = proc->files;
 420         struct fdtable *fdt;
 421         int retval;
 422
 423         if (files == NULL)
 424                 return -ESRCH;
 425
 426         spin_lock(&files->file_lock);
 427         fdt = files_fdtable(files);
 428         if (fd >= fdt->max_fds)
 429                 goto out_unlock;
 430         filp = fdt->fd[fd];
 431         if (!filp)
 432                 goto out_unlock;
 433         rcu_assign_pointer(fdt->fd[fd], NULL);
 434         __clear_close_on_exec(fd, fdt);
 435         __put_unused_fd(files, fd);
 436         spin_unlock(&files->file_lock);
 437         retval = filp_close(filp, files);
 438
 439         /* can't restart close syscall because file table entry was cleared */
 440         if (unlikely(retval == -ERESTARTSYS ||
 441                      retval == -ERESTARTNOINTR ||
 442                      retval == -ERESTARTNOHAND ||
 443                      retval == -ERESTART_RESTARTBLOCK))
 444                 retval = -EINTR;
 445
 446         return retval;
 447
 448 out_unlock:
 449         spin_unlock(&files->file_lock);
 450         return -EBADF;
 451 }
 452
 453 static void binder_set_nice(long nice)
 454 {
 455         long min_nice;
 456         if (can_nice(current, nice)) {
 457                 set_user_nice(current, nice);
 458                 return;
 459         }
 460         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 461         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 462                      "binder: %d: nice value %ld not allowed use "
 463                      "%ld instead\n", current->pid, nice, min_nice);
 464         set_user_nice(current, min_nice);
 465         if (min_nice < 20)
 466                 return;
 467         binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
 468 }
 469
 470 static size_t binder_buffer_size(struct binder_proc *proc,
 471                                  struct binder_buffer *buffer)
 472 {
 473         if (list_is_last(&buffer->entry, &proc->buffers))
 474                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 475         else
 476                 return (size_t)list_entry(buffer->entry.next,
 477                         struct binder_buffer, entry) - (size_t)buffer->data;
 478 }
 479
 480 static void binder_insert_free_buffer(struct binder_proc *proc,
 481                                       struct binder_buffer *new_buffer)
 482 {
 483         struct rb_node **p = &proc->free_buffers.rb_node;
 484         struct rb_node *parent = NULL;
 485         struct binder_buffer *buffer;
 486         size_t buffer_size;
 487         size_t new_buffer_size;
 488
 489         BUG_ON(!new_buffer->free);
 490
 491         new_buffer_size = binder_buffer_size(proc, new_buffer);
 492
 493         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 494                      "binder: %d: add free buffer, size %zd, "
 495                      "at %p\n", proc->pid, new_buffer_size, new_buffer);
 496
 497         while (*p) {
 498                 parent = *p;
 499                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 500                 BUG_ON(!buffer->free);
 501
 502                 buffer_size = binder_buffer_size(proc, buffer);
 503
 504                 if (new_buffer_size < buffer_size)
 505                         p = &parent->rb_left;
 506                 else
 507                         p = &parent->rb_right;
 508         }
 509         rb_link_node(&new_buffer->rb_node, parent, p);
 510         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 511 }
 512
 513 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 514                                            struct binder_buffer *new_buffer)
 515 {
 516         struct rb_node **p = &proc->allocated_buffers.rb_node;
 517         struct rb_node *parent = NULL;
 518         struct binder_buffer *buffer;
 519
 520         BUG_ON(new_buffer->free);
 521
 522         while (*p) {
 523                 parent = *p;
 524                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 525                 BUG_ON(buffer->free);
 526
 527                 if (new_buffer < buffer)
 528                         p = &parent->rb_left;
 529                 else if (new_buffer > buffer)
 530                         p = &parent->rb_right;
 531                 else
 532                         BUG();
 533         }
 534         rb_link_node(&new_buffer->rb_node, parent, p);
 535         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 536 }
 537
 538 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 539                                                   void __user *user_ptr)
 540 {
 541         struct rb_node *n = proc->allocated_buffers.rb_node;
 542         struct binder_buffer *buffer;
 543         struct binder_buffer *kern_ptr;
 544
 545         kern_ptr = user_ptr - proc->user_buffer_offset
 546                 - offsetof(struct binder_buffer, data);
 547
 548         while (n) {
 549                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 550                 BUG_ON(buffer->free);
 551
 552                 if (kern_ptr < buffer)
 553                         n = n->rb_left;
 554                 else if (kern_ptr > buffer)
 555                         n = n->rb_right;
 556                 else
 557                         return buffer;
 558         }
 559         return NULL;
 560 }
 561
 562 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 563                                     void *start, void *end,
 564                                     struct vm_area_struct *vma)
 565 {
 566         void *page_addr;
 567         unsigned long user_page_addr;
 568         struct vm_struct tmp_area;
 569         struct page **page;
 570         struct mm_struct *mm;
 571
 572         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 573                      "binder: %d: %s pages %p-%p\n", proc->pid,
 574                      allocate ? "allocate" : "free", start, end);
 575
 576         if (end <= start)
 577                 return 0;
 578
 579         if (vma)
 580                 mm = NULL;
 581         else
 582                 mm = get_task_mm(proc->tsk);
 583
 584         if (mm) {
 585                 down_write(&mm->mmap_sem);
 586                 vma = proc->vma;
 587                 if (vma && mm != proc->vma_vm_mm) {
 588                         pr_err("binder: %d: vma mm and task mm mismatch\n",
 589                                 proc->pid);
 590                         vma = NULL;
 591                 }
 592         }
 593
 594         if (allocate == 0)
 595                 goto free_range;
 596
 597         if (vma == NULL) {
 598                 pr_err("binder: %d: binder_alloc_buf failed to "
 599                        "map pages in userspace, no vma\n", proc->pid);
 600                 goto err_no_vma;
 601         }
 602
 603         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 604                 int ret;
 605                 struct page **page_array_ptr;
 606                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 607
 608                 BUG_ON(*page);
 609                 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 610                 if (*page == NULL) {
 611                         pr_err("binder: %d: binder_alloc_buf failed "
 612                                "for page at %p\n", proc->pid, page_addr);
 613                         goto err_alloc_page_failed;
 614                 }
 615                 tmp_area.addr = page_addr;
 616                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 617                 page_array_ptr = page;
 618                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 619                 if (ret) {
 620                         pr_err("binder: %d: binder_alloc_buf failed "
 621                                "to map page at %p in kernel\n",
 622                                proc->pid, page_addr);
 623                         goto err_map_kernel_failed;
 624                 }
 625                 user_page_addr =
 626                         (uintptr_t)page_addr + proc->user_buffer_offset;
 627                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 628                 if (ret) {
 629                         pr_err("binder: %d: binder_alloc_buf failed "
 630                                "to map page at %lx in userspace\n",
 631                                proc->pid, user_page_addr);
 632                         goto err_vm_insert_page_failed;
 633                 }
 634                 /* vm_insert_page does not seem to increment the refcount */
 635         }
 636         if (mm) {
 637                 up_write(&mm->mmap_sem);
 638                 mmput(mm);
 639         }
 640         return 0;
 641
 642 free_range:
 643         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 644              page_addr -= PAGE_SIZE) {
 645                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 646                 if (vma)
 647                         zap_page_range(vma, (uintptr_t)page_addr +
 648                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 649 err_vm_insert_page_failed:
 650                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 651 err_map_kernel_failed:
 652                 __free_page(*page);
 653                 *page = NULL;
 654 err_alloc_page_failed:
 655                 ;
 656         }
 657 err_no_vma:
 658         if (mm) {
 659                 up_write(&mm->mmap_sem);
 660                 mmput(mm);
 661         }
 662         return -ENOMEM;
 663 }
 664
 665 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 666                                               size_t data_size,
 667                                               size_t offsets_size, int is_async)
 668 {
 669         struct rb_node *n = proc->free_buffers.rb_node;
 670         struct binder_buffer *buffer;
 671         size_t buffer_size;
 672         struct rb_node *best_fit = NULL;
 673         void *has_page_addr;
 674         void *end_page_addr;
 675         size_t size;
 676
 677         if (proc->vma == NULL) {
 678                 pr_err("binder: %d: binder_alloc_buf, no vma\n",
 679                        proc->pid);
 680                 return NULL;
 681         }
 682
 683         size = ALIGN(data_size, sizeof(void *)) +
 684                 ALIGN(offsets_size, sizeof(void *));
 685
 686         if (size < data_size || size < offsets_size) {
 687                 binder_user_error("binder: %d: got transaction with invalid "
 688                         "size %zd-%zd\n", proc->pid, data_size, offsets_size);
 689                 return NULL;
 690         }
 691
 692         if (is_async &&
 693             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 694                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 695                              "binder: %d: binder_alloc_buf size %zd"
 696                              "failed, no async space left\n", proc->pid, size);
 697                 return NULL;
 698         }
 699
 700         while (n) {
 701                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 702                 BUG_ON(!buffer->free);
 703                 buffer_size = binder_buffer_size(proc, buffer);
 704
 705                 if (size < buffer_size) {
 706                         best_fit = n;
 707                         n = n->rb_left;
 708                 } else if (size > buffer_size)
 709                         n = n->rb_right;
 710                 else {
 711                         best_fit = n;
 712                         break;
 713                 }
 714         }
 715         if (best_fit == NULL) {
 716                 pr_err("binder: %d: binder_alloc_buf size %zd failed, "
 717                        "no address space\n", proc->pid, size);
 718                 return NULL;
 719         }
 720         if (n == NULL) {
 721                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 722                 buffer_size = binder_buffer_size(proc, buffer);
 723         }
 724
 725         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 726                      "binder: %d: binder_alloc_buf size %zd got buff"
 727                      "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
 728
 729         has_page_addr =
 730                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 731         if (n == NULL) {
 732                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 733                         buffer_size = size; /* no room for other buffers */
 734                 else
 735                         buffer_size = size + sizeof(struct binder_buffer);
 736         }
 737         end_page_addr =
 738                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 739         if (end_page_addr > has_page_addr)
 740                 end_page_addr = has_page_addr;
 741         if (binder_update_page_range(proc, 1,
 742             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 743                 return NULL;
 744
 745         rb_erase(best_fit, &proc->free_buffers);
 746         buffer->free = 0;
 747         binder_insert_allocated_buffer(proc, buffer);
 748         if (buffer_size != size) {
 749                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 750                 list_add(&new_buffer->entry, &buffer->entry);
 751                 new_buffer->free = 1;
 752                 binder_insert_free_buffer(proc, new_buffer);
 753         }
 754         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 755                      "binder: %d: binder_alloc_buf size %zd got "
 756                      "%p\n", proc->pid, size, buffer);
 757         buffer->data_size = data_size;
 758         buffer->offsets_size = offsets_size;
 759         buffer->async_transaction = is_async;
 760         if (is_async) {
 761                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 762                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 763                              "binder: %d: binder_alloc_buf size %zd "
 764                              "async free %zd\n", proc->pid, size,
 765                              proc->free_async_space);
 766         }
 767
 768         return buffer;
 769 }
 770
 771 static void *buffer_start_page(struct binder_buffer *buffer)
 772 {
 773         return (void *)((uintptr_t)buffer & PAGE_MASK);
 774 }
 775
 776 static void *buffer_end_page(struct binder_buffer *buffer)
 777 {
 778         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 779 }
 780
 781 static void binder_delete_free_buffer(struct binder_proc *proc,
 782                                       struct binder_buffer *buffer)
 783 {
 784         struct binder_buffer *prev, *next = NULL;
 785         int free_page_end = 1;
 786         int free_page_start = 1;
 787
 788         BUG_ON(proc->buffers.next == &buffer->entry);
 789         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 790         BUG_ON(!prev->free);
 791         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 792                 free_page_start = 0;
 793                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 794                         free_page_end = 0;
 795                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 796                              "binder: %d: merge free, buffer %p "
 797                              "share page with %p\n", proc->pid, buffer, prev);
 798         }
 799
 800         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 801                 next = list_entry(buffer->entry.next,
 802                                   struct binder_buffer, entry);
 803                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 804                         free_page_end = 0;
 805                         if (buffer_start_page(next) ==
 806                             buffer_start_page(buffer))
 807                                 free_page_start = 0;
 808                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 809                                      "binder: %d: merge free, buffer"
 810                                      " %p share page with %p\n", proc->pid,
 811                                      buffer, prev);
 812                 }
 813         }
 814         list_del(&buffer->entry);
 815         if (free_page_start || free_page_end) {
 816                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 817                              "binder: %d: merge free, buffer %p do "
 818                              "not share page%s%s with with %p or %p\n",
 819                              proc->pid, buffer, free_page_start ? "" : " end",
 820                              free_page_end ? "" : " start", prev, next);
 821                 binder_update_page_range(proc, 0, free_page_start ?
 822                         buffer_start_page(buffer) : buffer_end_page(buffer),
 823                         (free_page_end ? buffer_end_page(buffer) :
 824                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 825         }
 826 }
 827
 828 static void binder_free_buf(struct binder_proc *proc,
 829                             struct binder_buffer *buffer)
 830 {
 831         size_t size, buffer_size;
 832
 833         buffer_size = binder_buffer_size(proc, buffer);
 834
 835         size = ALIGN(buffer->data_size, sizeof(void *)) +
 836                 ALIGN(buffer->offsets_size, sizeof(void *));
 837
 838         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 839                      "binder: %d: binder_free_buf %p size %zd buffer"
 840                      "_size %zd\n", proc->pid, buffer, size, buffer_size);
 841
 842         BUG_ON(buffer->free);
 843         BUG_ON(size > buffer_size);
 844         BUG_ON(buffer->transaction != NULL);
 845         BUG_ON((void *)buffer < proc->buffer);
 846         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 847
 848         if (buffer->async_transaction) {
 849                 proc->free_async_space += size + sizeof(struct binder_buffer);
 850
 851                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 852                              "binder: %d: binder_free_buf size %zd "
 853                              "async free %zd\n", proc->pid, size,
 854                              proc->free_async_space);
 855         }
 856
 857         binder_update_page_range(proc, 0,
 858                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 859                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 860                 NULL);
 861         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 862         buffer->free = 1;
 863         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 864                 struct binder_buffer *next = list_entry(buffer->entry.next,
 865                                                 struct binder_buffer, entry);
 866                 if (next->free) {
 867                         rb_erase(&next->rb_node, &proc->free_buffers);
 868                         binder_delete_free_buffer(proc, next);
 869                 }
 870         }
 871         if (proc->buffers.next != &buffer->entry) {
 872                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 873                                                 struct binder_buffer, entry);
 874                 if (prev->free) {
 875                         binder_delete_free_buffer(proc, buffer);
 876                         rb_erase(&prev->rb_node, &proc->free_buffers);
 877                         buffer = prev;
 878                 }
 879         }
 880         binder_insert_free_buffer(proc, buffer);
 881 }
 882
 883 static struct binder_node *binder_get_node(struct binder_proc *proc,
 884                                            void __user *ptr)
 885 {
 886         struct rb_node *n = proc->nodes.rb_node;
 887         struct binder_node *node;
 888
 889         while (n) {
 890                 node = rb_entry(n, struct binder_node, rb_node);
 891
 892                 if (ptr < node->ptr)
 893                         n = n->rb_left;
 894                 else if (ptr > node->ptr)
 895                         n = n->rb_right;
 896                 else
 897                         return node;
 898         }
 899         return NULL;
 900 }
 901
 902 static struct binder_node *binder_new_node(struct binder_proc *proc,
 903                                            void __user *ptr,
 904                                            void __user *cookie)
 905 {
 906         struct rb_node **p = &proc->nodes.rb_node;
 907         struct rb_node *parent = NULL;
 908         struct binder_node *node;
 909
 910         while (*p) {
 911                 parent = *p;
 912                 node = rb_entry(parent, struct binder_node, rb_node);
 913
 914                 if (ptr < node->ptr)
 915                         p = &(*p)->rb_left;
 916                 else if (ptr > node->ptr)
 917                         p = &(*p)->rb_right;
 918                 else
 919                         return NULL;
 920         }
 921
 922         node = kzalloc(sizeof(*node), GFP_KERNEL);
 923         if (node == NULL)
 924                 return NULL;
 925         binder_stats_created(BINDER_STAT_NODE);
 926         rb_link_node(&node->rb_node, parent, p);
 927         rb_insert_color(&node->rb_node, &proc->nodes);
 928         node->debug_id = ++binder_last_id;
 929         node->proc = proc;
 930         node->ptr = ptr;
 931         node->cookie = cookie;
 932         node->work.type = BINDER_WORK_NODE;
 933         INIT_LIST_HEAD(&node->work.entry);
 934         INIT_LIST_HEAD(&node->async_todo);
 935         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 936                      "binder: %d:%d node %d u%p c%p created\n",
 937                      proc->pid, current->pid, node->debug_id,
 938                      node->ptr, node->cookie);
 939         return node;
 940 }
 941
 942 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 943                            struct list_head *target_list)
 944 {
 945         if (strong) {
 946                 if (internal) {
 947                         if (target_list == NULL &&
 948                             node->internal_strong_refs == 0 &&
 949                             !(node == binder_context_mgr_node &&
 950                             node->has_strong_ref)) {
 951                                 pr_err("binder: invalid inc strong "
 952                                         "node for %d\n", node->debug_id);
 953                                 return -EINVAL;
 954                         }
 955                         node->internal_strong_refs++;
 956                 } else
 957                         node->local_strong_refs++;
 958                 if (!node->has_strong_ref && target_list) {
 959                         list_del_init(&node->work.entry);
 960                         list_add_tail(&node->work.entry, target_list);
 961                 }
 962         } else {
 963                 if (!internal)
 964                         node->local_weak_refs++;
 965                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 966                         if (target_list == NULL) {
 967                                 pr_err("binder: invalid inc weak node "
 968                                         "for %d\n", node->debug_id);
 969                                 return -EINVAL;
 970                         }
 971                         list_add_tail(&node->work.entry, target_list);
 972                 }
 973         }
 974         return 0;
 975 }
 976
 977 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 978 {
 979         if (strong) {
 980                 if (internal)
 981                         node->internal_strong_refs--;
 982                 else
 983                         node->local_strong_refs--;
 984                 if (node->local_strong_refs || node->internal_strong_refs)
 985                         return 0;
 986         } else {
 987                 if (!internal)
 988                         node->local_weak_refs--;
 989                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 990                         return 0;
 991         }
 992         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 993                 if (list_empty(&node->work.entry)) {
 994                         list_add_tail(&node->work.entry, &node->proc->todo);
 995                         wake_up_interruptible(&node->proc->wait);
 996                 }
 997         } else {
 998                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 999                     !node->local_weak_refs) {
1000                         list_del_init(&node->work.entry);
1001                         if (node->proc) {
1002                                 rb_erase(&node->rb_node, &node->proc->nodes);
1003                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1004                                              "binder: refless node %d deleted\n",
1005                                              node->debug_id);
1006                         } else {
1007                                 hlist_del(&node->dead_node);
1008                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1009                                              "binder: dead node %d deleted\n",
1010                                              node->debug_id);
1011                         }
1012                         kfree(node);
1013                         binder_stats_deleted(BINDER_STAT_NODE);
1014                 }
1015         }
1016
1017         return 0;
1018 }
1019
1020
1021 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1022                                          uint32_t desc)
1023 {
1024         struct rb_node *n = proc->refs_by_desc.rb_node;
1025         struct binder_ref *ref;
1026
1027         while (n) {
1028                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1029
1030                 if (desc < ref->desc)
1031                         n = n->rb_left;
1032                 else if (desc > ref->desc)
1033                         n = n->rb_right;
1034                 else
1035                         return ref;
1036         }
1037         return NULL;
1038 }
1039
1040 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1041                                                   struct binder_node *node)
1042 {
1043         struct rb_node *n;
1044         struct rb_node **p = &proc->refs_by_node.rb_node;
1045         struct rb_node *parent = NULL;
1046         struct binder_ref *ref, *new_ref;
1047
1048         while (*p) {
1049                 parent = *p;
1050                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1051
1052                 if (node < ref->node)
1053                         p = &(*p)->rb_left;
1054                 else if (node > ref->node)
1055                         p = &(*p)->rb_right;
1056                 else
1057                         return ref;
1058         }
1059         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1060         if (new_ref == NULL)
1061                 return NULL;
1062         binder_stats_created(BINDER_STAT_REF);
1063         new_ref->debug_id = ++binder_last_id;
1064         new_ref->proc = proc;
1065         new_ref->node = node;
1066         rb_link_node(&new_ref->rb_node_node, parent, p);
1067         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1068
1069         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1070         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1071                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1072                 if (ref->desc > new_ref->desc)
1073                         break;
1074                 new_ref->desc = ref->desc + 1;
1075         }
1076
1077         p = &proc->refs_by_desc.rb_node;
1078         while (*p) {
1079                 parent = *p;
1080                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1081
1082                 if (new_ref->desc < ref->desc)
1083                         p = &(*p)->rb_left;
1084                 else if (new_ref->desc > ref->desc)
1085                         p = &(*p)->rb_right;
1086                 else
1087                         BUG();
1088         }
1089         rb_link_node(&new_ref->rb_node_desc, parent, p);
1090         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1091         if (node) {
1092                 hlist_add_head(&new_ref->node_entry, &node->refs);
1093
1094                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1095                              "binder: %d new ref %d desc %d for "
1096                              "node %d\n", proc->pid, new_ref->debug_id,
1097                              new_ref->desc, node->debug_id);
1098         } else {
1099                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1100                              "binder: %d new ref %d desc %d for "
1101                              "dead node\n", proc->pid, new_ref->debug_id,
1102                               new_ref->desc);
1103         }
1104         return new_ref;
1105 }
1106
1107 static void binder_delete_ref(struct binder_ref *ref)
1108 {
1109         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1110                      "binder: %d delete ref %d desc %d for "
1111                      "node %d\n", ref->proc->pid, ref->debug_id,
1112                      ref->desc, ref->node->debug_id);
1113
1114         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1115         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1116         if (ref->strong)
1117                 binder_dec_node(ref->node, 1, 1);
1118         hlist_del(&ref->node_entry);
1119         binder_dec_node(ref->node, 0, 1);
1120         if (ref->death) {
1121                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1122                              "binder: %d delete ref %d desc %d "
1123                              "has death notification\n", ref->proc->pid,
1124                              ref->debug_id, ref->desc);
1125                 list_del(&ref->death->work.entry);
1126                 kfree(ref->death);
1127                 binder_stats_deleted(BINDER_STAT_DEATH);
1128         }
1129         kfree(ref);
1130         binder_stats_deleted(BINDER_STAT_REF);
1131 }
1132
1133 static int binder_inc_ref(struct binder_ref *ref, int strong,
1134                           struct list_head *target_list)
1135 {
1136         int ret;
1137         if (strong) {
1138                 if (ref->strong == 0) {
1139                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1140                         if (ret)
1141                                 return ret;
1142                 }
1143                 ref->strong++;
1144         } else {
1145                 if (ref->weak == 0) {
1146                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1147                         if (ret)
1148                                 return ret;
1149                 }
1150                 ref->weak++;
1151         }
1152         return 0;
1153 }
1154
1155
1156 static int binder_dec_ref(struct binder_ref *ref, int strong)
1157 {
1158         if (strong) {
1159                 if (ref->strong == 0) {
1160                         binder_user_error("binder: %d invalid dec strong, "
1161                                           "ref %d desc %d s %d w %d\n",
1162                                           ref->proc->pid, ref->debug_id,
1163                                           ref->desc, ref->strong, ref->weak);
1164                         return -EINVAL;
1165                 }
1166                 ref->strong--;
1167                 if (ref->strong == 0) {
1168                         int ret;
1169                         ret = binder_dec_node(ref->node, strong, 1);
1170                         if (ret)
1171                                 return ret;
1172                 }
1173         } else {
1174                 if (ref->weak == 0) {
1175                         binder_user_error("binder: %d invalid dec weak, "
1176                                           "ref %d desc %d s %d w %d\n",
1177                                           ref->proc->pid, ref->debug_id,
1178                                           ref->desc, ref->strong, ref->weak);
1179                         return -EINVAL;
1180                 }
1181                 ref->weak--;
1182         }
1183         if (ref->strong == 0 && ref->weak == 0)
1184                 binder_delete_ref(ref);
1185         return 0;
1186 }
1187
1188 static void binder_pop_transaction(struct binder_thread *target_thread,
1189                                    struct binder_transaction *t)
1190 {
1191         if (target_thread) {
1192                 BUG_ON(target_thread->transaction_stack != t);
1193                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1194                 target_thread->transaction_stack =
1195                         target_thread->transaction_stack->from_parent;
1196                 t->from = NULL;
1197         }
1198         t->need_reply = 0;
1199         if (t->buffer)
1200                 t->buffer->transaction = NULL;
1201         kfree(t);
1202         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1203 }
1204
1205 static void binder_send_failed_reply(struct binder_transaction *t,
1206                                      uint32_t error_code)
1207 {
1208         struct binder_thread *target_thread;
1209         BUG_ON(t->flags & TF_ONE_WAY);
1210         while (1) {
1211                 target_thread = t->from;
1212                 if (target_thread) {
1213                         if (target_thread->return_error != BR_OK &&
1214                            target_thread->return_error2 == BR_OK) {
1215                                 target_thread->return_error2 =
1216                                         target_thread->return_error;
1217                                 target_thread->return_error = BR_OK;
1218                         }
1219                         if (target_thread->return_error == BR_OK) {
1220                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1221                                              "binder: send failed reply for "
1222                                              "transaction %d to %d:%d\n",
1223                                               t->debug_id, target_thread->proc->pid,
1224                                               target_thread->pid);
1225
1226                                 binder_pop_transaction(target_thread, t);
1227                                 target_thread->return_error = error_code;
1228                                 wake_up_interruptible(&target_thread->wait);
1229                         } else {
1230                                 pr_err("binder: reply failed, target "
1231                                         "thread, %d:%d, has error code %d "
1232                                         "already\n", target_thread->proc->pid,
1233                                         target_thread->pid,
1234                                         target_thread->return_error);
1235                         }
1236                         return;
1237                 } else {
1238                         struct binder_transaction *next = t->from_parent;
1239
1240                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1241                                      "binder: send failed reply "
1242                                      "for transaction %d, target dead\n",
1243                                      t->debug_id);
1244
1245                         binder_pop_transaction(target_thread, t);
1246                         if (next == NULL) {
1247                                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1248                                              "binder: reply failed,"
1249                                              " no target thread at root\n");
1250                                 return;
1251                         }
1252                         t = next;
1253                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1254                                      "binder: reply failed, no target "
1255                                      "thread -- retry %d\n", t->debug_id);
1256                 }
1257         }
1258 }
1259
1260 static void binder_transaction_buffer_release(struct binder_proc *proc,
1261                                               struct binder_buffer *buffer,
1262                                               size_t *failed_at)
1263 {
1264         size_t *offp, *off_end;
1265         int debug_id = buffer->debug_id;
1266
1267         binder_debug(BINDER_DEBUG_TRANSACTION,
1268                      "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1269                      proc->pid, buffer->debug_id,
1270                      buffer->data_size, buffer->offsets_size, failed_at);
1271
1272         if (buffer->target_node)
1273                 binder_dec_node(buffer->target_node, 1, 0);
1274
1275         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1276         if (failed_at)
1277                 off_end = failed_at;
1278         else
1279                 off_end = (void *)offp + buffer->offsets_size;
1280         for (; offp < off_end; offp++) {
1281                 struct flat_binder_object *fp;
1282                 if (*offp > buffer->data_size - sizeof(*fp) ||
1283                     buffer->data_size < sizeof(*fp) ||
1284                     !IS_ALIGNED(*offp, sizeof(void *))) {
1285                         pr_err("binder: transaction release %d bad"
1286                                         "offset %zd, size %zd\n", debug_id,
1287                                         *offp, buffer->data_size);
1288                         continue;
1289                 }
1290                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1291                 switch (fp->type) {
1292                 case BINDER_TYPE_BINDER:
1293                 case BINDER_TYPE_WEAK_BINDER: {
1294                         struct binder_node *node = binder_get_node(proc, fp->binder);
1295                         if (node == NULL) {
1296                                 pr_err("binder: transaction release %d"
1297                                        " bad node %p\n", debug_id, fp->binder);
1298                                 break;
1299                         }
1300                         binder_debug(BINDER_DEBUG_TRANSACTION,
1301                                      "        node %d u%p\n",
1302                                      node->debug_id, node->ptr);
1303                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1304                 } break;
1305                 case BINDER_TYPE_HANDLE:
1306                 case BINDER_TYPE_WEAK_HANDLE: {
1307                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1308                         if (ref == NULL) {
1309                                 pr_err("binder: transaction release %d"
1310                                        " bad handle %ld\n", debug_id,
1311                                        fp->handle);
1312                                 break;
1313                         }
1314                         binder_debug(BINDER_DEBUG_TRANSACTION,
1315                                      "        ref %d desc %d (node %d)\n",
1316                                      ref->debug_id, ref->desc, ref->node->debug_id);
1317                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1318                 } break;
1319
1320                 case BINDER_TYPE_FD:
1321                         binder_debug(BINDER_DEBUG_TRANSACTION,
1322                                      "        fd %ld\n", fp->handle);
1323                         if (failed_at)
1324                                 task_close_fd(proc, fp->handle);
1325                         break;
1326
1327                 default:
1328                         pr_err("binder: transaction release %d bad "
1329                                "object type %lx\n", debug_id, fp->type);
1330                         break;
1331                 }
1332         }
1333 }
1334
1335 static void binder_transaction(struct binder_proc *proc,
1336                                struct binder_thread *thread,
1337                                struct binder_transaction_data *tr, int reply)
1338 {
1339         struct binder_transaction *t;
1340         struct binder_work *tcomplete;
1341         size_t *offp, *off_end;
1342         struct binder_proc *target_proc;
1343         struct binder_thread *target_thread = NULL;
1344         struct binder_node *target_node = NULL;
1345         struct list_head *target_list;
1346         wait_queue_head_t *target_wait;
1347         struct binder_transaction *in_reply_to = NULL;
1348         struct binder_transaction_log_entry *e;
1349         uint32_t return_error;
1350
1351         e = binder_transaction_log_add(&binder_transaction_log);
1352         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1353         e->from_proc = proc->pid;
1354         e->from_thread = thread->pid;
1355         e->target_handle = tr->target.handle;
1356         e->data_size = tr->data_size;
1357         e->offsets_size = tr->offsets_size;
1358
1359         if (reply) {
1360                 in_reply_to = thread->transaction_stack;
1361                 if (in_reply_to == NULL) {
1362                         binder_user_error("binder: %d:%d got reply transaction "
1363                                           "with no transaction stack\n",
1364                                           proc->pid, thread->pid);
1365                         return_error = BR_FAILED_REPLY;
1366                         goto err_empty_call_stack;
1367                 }
1368                 binder_set_nice(in_reply_to->saved_priority);
1369                 if (in_reply_to->to_thread != thread) {
1370                         binder_user_error("binder: %d:%d got reply transaction "
1371                                 "with bad transaction stack,"
1372                                 " transaction %d has target %d:%d\n",
1373                                 proc->pid, thread->pid, in_reply_to->debug_id,
1374                                 in_reply_to->to_proc ?
1375                                 in_reply_to->to_proc->pid : 0,
1376                                 in_reply_to->to_thread ?
1377                                 in_reply_to->to_thread->pid : 0);
1378                         return_error = BR_FAILED_REPLY;
1379                         in_reply_to = NULL;
1380                         goto err_bad_call_stack;
1381                 }
1382                 thread->transaction_stack = in_reply_to->to_parent;
1383                 target_thread = in_reply_to->from;
1384                 if (target_thread == NULL) {
1385                         return_error = BR_DEAD_REPLY;
1386                         goto err_dead_binder;
1387                 }
1388                 if (target_thread->transaction_stack != in_reply_to) {
1389                         binder_user_error("binder: %d:%d got reply transaction "
1390                                 "with bad target transaction stack %d, "
1391                                 "expected %d\n",
1392                                 proc->pid, thread->pid,
1393                                 target_thread->transaction_stack ?
1394                                 target_thread->transaction_stack->debug_id : 0,
1395                                 in_reply_to->debug_id);
1396                         return_error = BR_FAILED_REPLY;
1397                         in_reply_to = NULL;
1398                         target_thread = NULL;
1399                         goto err_dead_binder;
1400                 }
1401                 target_proc = target_thread->proc;
1402         } else {
1403                 if (tr->target.handle) {
1404                         struct binder_ref *ref;
1405                         ref = binder_get_ref(proc, tr->target.handle);
1406                         if (ref == NULL) {
1407                                 binder_user_error("binder: %d:%d got "
1408                                         "transaction to invalid handle\n",
1409                                         proc->pid, thread->pid);
1410                                 return_error = BR_FAILED_REPLY;
1411                                 goto err_invalid_target_handle;
1412                         }
1413                         target_node = ref->node;
1414                 } else {
1415                         target_node = binder_context_mgr_node;
1416                         if (target_node == NULL) {
1417                                 return_error = BR_DEAD_REPLY;
1418                                 goto err_no_context_mgr_node;
1419                         }
1420                 }
1421                 e->to_node = target_node->debug_id;
1422                 target_proc = target_node->proc;
1423                 if (target_proc == NULL) {
1424                         return_error = BR_DEAD_REPLY;
1425                         goto err_dead_binder;
1426                 }
1427                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1428                         struct binder_transaction *tmp;
1429                         tmp = thread->transaction_stack;
1430                         if (tmp->to_thread != thread) {
1431                                 binder_user_error("binder: %d:%d got new "
1432                                         "transaction with bad transaction stack"
1433                                         ", transaction %d has target %d:%d\n",
1434                                         proc->pid, thread->pid, tmp->debug_id,
1435                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1436                                         tmp->to_thread ?
1437                                         tmp->to_thread->pid : 0);
1438                                 return_error = BR_FAILED_REPLY;
1439                                 goto err_bad_call_stack;
1440                         }
1441                         while (tmp) {
1442                                 if (tmp->from && tmp->from->proc == target_proc)
1443                                         target_thread = tmp->from;
1444                                 tmp = tmp->from_parent;
1445                         }
1446                 }
1447         }
1448         if (target_thread) {
1449                 e->to_thread = target_thread->pid;
1450                 target_list = &target_thread->todo;
1451                 target_wait = &target_thread->wait;
1452         } else {
1453                 target_list = &target_proc->todo;
1454                 target_wait = &target_proc->wait;
1455         }
1456         e->to_proc = target_proc->pid;
1457
1458         /* TODO: reuse incoming transaction for reply */
1459         t = kzalloc(sizeof(*t), GFP_KERNEL);
1460         if (t == NULL) {
1461                 return_error = BR_FAILED_REPLY;
1462                 goto err_alloc_t_failed;
1463         }
1464         binder_stats_created(BINDER_STAT_TRANSACTION);
1465
1466         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1467         if (tcomplete == NULL) {
1468                 return_error = BR_FAILED_REPLY;
1469                 goto err_alloc_tcomplete_failed;
1470         }
1471         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1472
1473         t->debug_id = ++binder_last_id;
1474         e->debug_id = t->debug_id;
1475
1476         if (reply)
1477                 binder_debug(BINDER_DEBUG_TRANSACTION,
1478                              "binder: %d:%d BC_REPLY %d -> %d:%d, "
1479                              "data %p-%p size %zd-%zd\n",
1480                              proc->pid, thread->pid, t->debug_id,
1481                              target_proc->pid, target_thread->pid,
1482                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1483                              tr->data_size, tr->offsets_size);
1484         else
1485                 binder_debug(BINDER_DEBUG_TRANSACTION,
1486                              "binder: %d:%d BC_TRANSACTION %d -> "
1487                              "%d - node %d, data %p-%p size %zd-%zd\n",
1488                              proc->pid, thread->pid, t->debug_id,
1489                              target_proc->pid, target_node->debug_id,
1490                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1491                              tr->data_size, tr->offsets_size);
1492
1493         if (!reply && !(tr->flags & TF_ONE_WAY))
1494                 t->from = thread;
1495         else
1496                 t->from = NULL;
1497         t->sender_euid = proc->tsk->cred->euid;
1498         t->to_proc = target_proc;
1499         t->to_thread = target_thread;
1500         t->code = tr->code;
1501         t->flags = tr->flags;
1502         t->priority = task_nice(current);
1503         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1504                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1505         if (t->buffer == NULL) {
1506                 return_error = BR_FAILED_REPLY;
1507                 goto err_binder_alloc_buf_failed;
1508         }
1509         t->buffer->allow_user_free = 0;
1510         t->buffer->debug_id = t->debug_id;
1511         t->buffer->transaction = t;
1512         t->buffer->target_node = target_node;
1513         if (target_node)
1514                 binder_inc_node(target_node, 1, 0, NULL);
1515
1516         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1517
1518         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1519                 binder_user_error("binder: %d:%d got transaction with invalid "
1520                         "data ptr\n", proc->pid, thread->pid);
1521                 return_error = BR_FAILED_REPLY;
1522                 goto err_copy_data_failed;
1523         }
1524         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1525                 binder_user_error("binder: %d:%d got transaction with invalid "
1526                         "offsets ptr\n", proc->pid, thread->pid);
1527                 return_error = BR_FAILED_REPLY;
1528                 goto err_copy_data_failed;
1529         }
1530         if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1531                 binder_user_error("binder: %d:%d got transaction with "
1532                         "invalid offsets size, %zd\n",
1533                         proc->pid, thread->pid, tr->offsets_size);
1534                 return_error = BR_FAILED_REPLY;
1535                 goto err_bad_offset;
1536         }
1537         off_end = (void *)offp + tr->offsets_size;
1538         for (; offp < off_end; offp++) {
1539                 struct flat_binder_object *fp;
1540                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1541                     t->buffer->data_size < sizeof(*fp) ||
1542                     !IS_ALIGNED(*offp, sizeof(void *))) {
1543                         binder_user_error("binder: %d:%d got transaction with "
1544                                 "invalid offset, %zd\n",
1545                                 proc->pid, thread->pid, *offp);
1546                         return_error = BR_FAILED_REPLY;
1547                         goto err_bad_offset;
1548                 }
1549                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1550                 switch (fp->type) {
1551                 case BINDER_TYPE_BINDER:
1552                 case BINDER_TYPE_WEAK_BINDER: {
1553                         struct binder_ref *ref;
1554                         struct binder_node *node = binder_get_node(proc, fp->binder);
1555                         if (node == NULL) {
1556                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1557                                 if (node == NULL) {
1558                                         return_error = BR_FAILED_REPLY;
1559                                         goto err_binder_new_node_failed;
1560                                 }
1561                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1562                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1563                         }
1564                         if (fp->cookie != node->cookie) {
1565                                 binder_user_error("binder: %d:%d sending u%p "
1566                                         "node %d, cookie mismatch %p != %p\n",
1567                                         proc->pid, thread->pid,
1568                                         fp->binder, node->debug_id,
1569                                         fp->cookie, node->cookie);
1570                                 goto err_binder_get_ref_for_node_failed;
1571                         }
1572                         ref = binder_get_ref_for_node(target_proc, node);
1573                         if (ref == NULL) {
1574                                 return_error = BR_FAILED_REPLY;
1575                                 goto err_binder_get_ref_for_node_failed;
1576                         }
1577                         if (fp->type == BINDER_TYPE_BINDER)
1578                                 fp->type = BINDER_TYPE_HANDLE;
1579                         else
1580                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1581                         fp->handle = ref->desc;
1582                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1583                                        &thread->todo);
1584
1585                         binder_debug(BINDER_DEBUG_TRANSACTION,
1586                                      "        node %d u%p -> ref %d desc %d\n",
1587                                      node->debug_id, node->ptr, ref->debug_id,
1588                                      ref->desc);
1589                 } break;
1590                 case BINDER_TYPE_HANDLE:
1591                 case BINDER_TYPE_WEAK_HANDLE: {
1592                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1593                         if (ref == NULL) {
1594                                 binder_user_error("binder: %d:%d got "
1595                                         "transaction with invalid "
1596                                         "handle, %ld\n", proc->pid,
1597                                         thread->pid, fp->handle);
1598                                 return_error = BR_FAILED_REPLY;
1599                                 goto err_binder_get_ref_failed;
1600                         }
1601                         if (ref->node->proc == target_proc) {
1602                                 if (fp->type == BINDER_TYPE_HANDLE)
1603                                         fp->type = BINDER_TYPE_BINDER;
1604                                 else
1605                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1606                                 fp->binder = ref->node->ptr;
1607                                 fp->cookie = ref->node->cookie;
1608                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1609                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1610                                              "        ref %d desc %d -> node %d u%p\n",
1611                                              ref->debug_id, ref->desc, ref->node->debug_id,
1612                                              ref->node->ptr);
1613                         } else {
1614                                 struct binder_ref *new_ref;
1615                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1616                                 if (new_ref == NULL) {
1617                                         return_error = BR_FAILED_REPLY;
1618                                         goto err_binder_get_ref_for_node_failed;
1619                                 }
1620                                 fp->handle = new_ref->desc;
1621                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1622                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1623                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1624                                              ref->debug_id, ref->desc, new_ref->debug_id,
1625                                              new_ref->desc, ref->node->debug_id);
1626                         }
1627                 } break;
1628
1629                 case BINDER_TYPE_FD: {
1630                         int target_fd;
1631                         struct file *file;
1632
1633                         if (reply) {
1634                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1635                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1636                                                 proc->pid, thread->pid, fp->handle);
1637                                         return_error = BR_FAILED_REPLY;
1638                                         goto err_fd_not_allowed;
1639                                 }
1640                         } else if (!target_node->accept_fds) {
1641                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1642                                         proc->pid, thread->pid, fp->handle);
1643                                 return_error = BR_FAILED_REPLY;
1644                                 goto err_fd_not_allowed;
1645                         }
1646
1647                         file = fget(fp->handle);
1648                         if (file == NULL) {
1649                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1650                                         proc->pid, thread->pid, fp->handle);
1651                                 return_error = BR_FAILED_REPLY;
1652                                 goto err_fget_failed;
1653                         }
1654                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1655                         if (target_fd < 0) {
1656                                 fput(file);
1657                                 return_error = BR_FAILED_REPLY;
1658                                 goto err_get_unused_fd_failed;
1659                         }
1660                         task_fd_install(target_proc, target_fd, file);
1661                         binder_debug(BINDER_DEBUG_TRANSACTION,
1662                                      "        fd %ld -> %d\n", fp->handle, target_fd);
1663                         /* TODO: fput? */
1664                         fp->handle = target_fd;
1665                 } break;
1666
1667                 default:
1668                         binder_user_error("binder: %d:%d got transactio"
1669                                 "n with invalid object type, %lx\n",
1670                                 proc->pid, thread->pid, fp->type);
1671                         return_error = BR_FAILED_REPLY;
1672                         goto err_bad_object_type;
1673                 }
1674         }
1675         if (reply) {
1676                 BUG_ON(t->buffer->async_transaction != 0);
1677                 binder_pop_transaction(target_thread, in_reply_to);
1678         } else if (!(t->flags & TF_ONE_WAY)) {
1679                 BUG_ON(t->buffer->async_transaction != 0);
1680                 t->need_reply = 1;
1681                 t->from_parent = thread->transaction_stack;
1682                 thread->transaction_stack = t;
1683         } else {
1684                 BUG_ON(target_node == NULL);
1685                 BUG_ON(t->buffer->async_transaction != 1);
1686                 if (target_node->has_async_transaction) {
1687                         target_list = &target_node->async_todo;
1688                         target_wait = NULL;
1689                 } else
1690                         target_node->has_async_transaction = 1;
1691         }
1692         t->work.type = BINDER_WORK_TRANSACTION;
1693         list_add_tail(&t->work.entry, target_list);
1694         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1695         list_add_tail(&tcomplete->entry, &thread->todo);
1696         if (target_wait)
1697                 wake_up_interruptible(target_wait);
1698         return;
1699
1700 err_get_unused_fd_failed:
1701 err_fget_failed:
1702 err_fd_not_allowed:
1703 err_binder_get_ref_for_node_failed:
1704 err_binder_get_ref_failed:
1705 err_binder_new_node_failed:
1706 err_bad_object_type:
1707 err_bad_offset:
1708 err_copy_data_failed:
1709         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1710         t->buffer->transaction = NULL;
1711         binder_free_buf(target_proc, t->buffer);
1712 err_binder_alloc_buf_failed:
1713         kfree(tcomplete);
1714         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1715 err_alloc_tcomplete_failed:
1716         kfree(t);
1717         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1718 err_alloc_t_failed:
1719 err_bad_call_stack:
1720 err_empty_call_stack:
1721 err_dead_binder:
1722 err_invalid_target_handle:
1723 err_no_context_mgr_node:
1724         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1725                      "binder: %d:%d transaction failed %d, size %zd-%zd\n",
1726                      proc->pid, thread->pid, return_error,
1727                      tr->data_size, tr->offsets_size);
1728
1729         {
1730                 struct binder_transaction_log_entry *fe;
1731                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1732                 *fe = *e;
1733         }
1734
1735         BUG_ON(thread->return_error != BR_OK);
1736         if (in_reply_to) {
1737                 thread->return_error = BR_TRANSACTION_COMPLETE;
1738                 binder_send_failed_reply(in_reply_to, return_error);
1739         } else
1740                 thread->return_error = return_error;
1741 }
1742
1743 int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1744                         void __user *buffer, int size, signed long *consumed)
1745 {
1746         uint32_t cmd;
1747         void __user *ptr = buffer + *consumed;
1748         void __user *end = buffer + size;
1749
1750         while (ptr < end && thread->return_error == BR_OK) {
1751                 if (get_user(cmd, (uint32_t __user *)ptr))
1752                         return -EFAULT;
1753                 ptr += sizeof(uint32_t);
1754                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1755                         binder_stats.bc[_IOC_NR(cmd)]++;
1756                         proc->stats.bc[_IOC_NR(cmd)]++;
1757                         thread->stats.bc[_IOC_NR(cmd)]++;
1758                 }
1759                 switch (cmd) {
1760                 case BC_INCREFS:
1761                 case BC_ACQUIRE:
1762                 case BC_RELEASE:
1763                 case BC_DECREFS: {
1764                         uint32_t target;
1765                         struct binder_ref *ref;
1766                         const char *debug_string;
1767
1768                         if (get_user(target, (uint32_t __user *)ptr))
1769                                 return -EFAULT;
1770                         ptr += sizeof(uint32_t);
1771                         if (target == 0 && binder_context_mgr_node &&
1772                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1773                                 ref = binder_get_ref_for_node(proc,
1774                                                binder_context_mgr_node);
1775                                 if (ref->desc != target) {
1776                                         binder_user_error("binder: %d:"
1777                                                 "%d tried to acquire "
1778                                                 "reference to desc 0, "
1779                                                 "got %d instead\n",
1780                                                 proc->pid, thread->pid,
1781                                                 ref->desc);
1782                                 }
1783                         } else
1784                                 ref = binder_get_ref(proc, target);
1785                         if (ref == NULL) {
1786                                 binder_user_error("binder: %d:%d refcou"
1787                                         "nt change on invalid ref %d\n",
1788                                         proc->pid, thread->pid, target);
1789                                 break;
1790                         }
1791                         switch (cmd) {
1792                         case BC_INCREFS:
1793                                 debug_string = "IncRefs";
1794                                 binder_inc_ref(ref, 0, NULL);
1795                                 break;
1796                         case BC_ACQUIRE:
1797                                 debug_string = "Acquire";
1798                                 binder_inc_ref(ref, 1, NULL);
1799                                 break;
1800                         case BC_RELEASE:
1801                                 debug_string = "Release";
1802                                 binder_dec_ref(ref, 1);
1803                                 break;
1804                         case BC_DECREFS:
1805                         default:
1806                                 debug_string = "DecRefs";
1807                                 binder_dec_ref(ref, 0);
1808                                 break;
1809                         }
1810                         binder_debug(BINDER_DEBUG_USER_REFS,
1811                                      "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1812                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1813                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1814                         break;
1815                 }
1816                 case BC_INCREFS_DONE:
1817                 case BC_ACQUIRE_DONE: {
1818                         void __user *node_ptr;
1819                         void *cookie;
1820                         struct binder_node *node;
1821
1822                         if (get_user(node_ptr, (void * __user *)ptr))
1823                                 return -EFAULT;
1824                         ptr += sizeof(void *);
1825                         if (get_user(cookie, (void * __user *)ptr))
1826                                 return -EFAULT;
1827                         ptr += sizeof(void *);
1828                         node = binder_get_node(proc, node_ptr);
1829                         if (node == NULL) {
1830                                 binder_user_error("binder: %d:%d "
1831                                         "%s u%p no match\n",
1832                                         proc->pid, thread->pid,
1833                                         cmd == BC_INCREFS_DONE ?
1834                                         "BC_INCREFS_DONE" :
1835                                         "BC_ACQUIRE_DONE",
1836                                         node_ptr);
1837                                 break;
1838                         }
1839                         if (cookie != node->cookie) {
1840                                 binder_user_error("binder: %d:%d %s u%p node %d"
1841                                         " cookie mismatch %p != %p\n",
1842                                         proc->pid, thread->pid,
1843                                         cmd == BC_INCREFS_DONE ?
1844                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1845                                         node_ptr, node->debug_id,
1846                                         cookie, node->cookie);
1847                                 break;
1848                         }
1849                         if (cmd == BC_ACQUIRE_DONE) {
1850                                 if (node->pending_strong_ref == 0) {
1851                                         binder_user_error("binder: %d:%d "
1852                                                 "BC_ACQUIRE_DONE node %d has "
1853                                                 "no pending acquire request\n",
1854                                                 proc->pid, thread->pid,
1855                                                 node->debug_id);
1856                                         break;
1857                                 }
1858                                 node->pending_strong_ref = 0;
1859                         } else {
1860                                 if (node->pending_weak_ref == 0) {
1861                                         binder_user_error("binder: %d:%d "
1862                                                 "BC_INCREFS_DONE node %d has "
1863                                                 "no pending increfs request\n",
1864                                                 proc->pid, thread->pid,
1865                                                 node->debug_id);
1866                                         break;
1867                                 }
1868                                 node->pending_weak_ref = 0;
1869                         }
1870                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1871                         binder_debug(BINDER_DEBUG_USER_REFS,
1872                                      "binder: %d:%d %s node %d ls %d lw %d\n",
1873                                      proc->pid, thread->pid,
1874                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1875                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1876                         break;
1877                 }
1878                 case BC_ATTEMPT_ACQUIRE:
1879                         pr_err("binder: BC_ATTEMPT_ACQUIRE not supported\n");
1880                         return -EINVAL;
1881                 case BC_ACQUIRE_RESULT:
1882                         pr_err("binder: BC_ACQUIRE_RESULT not supported\n");
1883                         return -EINVAL;
1884
1885                 case BC_FREE_BUFFER: {
1886                         void __user *data_ptr;
1887                         struct binder_buffer *buffer;
1888
1889                         if (get_user(data_ptr, (void * __user *)ptr))
1890                                 return -EFAULT;
1891                         ptr += sizeof(void *);
1892
1893                         buffer = binder_buffer_lookup(proc, data_ptr);
1894                         if (buffer == NULL) {
1895                                 binder_user_error("binder: %d:%d "
1896                                         "BC_FREE_BUFFER u%p no match\n",
1897                                         proc->pid, thread->pid, data_ptr);
1898                                 break;
1899                         }
1900                         if (!buffer->allow_user_free) {
1901                                 binder_user_error("binder: %d:%d "
1902                                         "BC_FREE_BUFFER u%p matched "
1903                                         "unreturned buffer\n",
1904                                         proc->pid, thread->pid, data_ptr);
1905                                 break;
1906                         }
1907                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1908                                      "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1909                                      proc->pid, thread->pid, data_ptr, buffer->debug_id,
1910                                      buffer->transaction ? "active" : "finished");
1911
1912                         if (buffer->transaction) {
1913                                 buffer->transaction->buffer = NULL;
1914                                 buffer->transaction = NULL;
1915                         }
1916                         if (buffer->async_transaction && buffer->target_node) {
1917                                 BUG_ON(!buffer->target_node->has_async_transaction);
1918                                 if (list_empty(&buffer->target_node->async_todo))
1919                                         buffer->target_node->has_async_transaction = 0;
1920                                 else
1921                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1922                         }
1923                         binder_transaction_buffer_release(proc, buffer, NULL);
1924                         binder_free_buf(proc, buffer);
1925                         break;
1926                 }
1927
1928                 case BC_TRANSACTION:
1929                 case BC_REPLY: {
1930                         struct binder_transaction_data tr;
1931
1932                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1933                                 return -EFAULT;
1934                         ptr += sizeof(tr);
1935                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1936                         break;
1937                 }
1938
1939                 case BC_REGISTER_LOOPER:
1940                         binder_debug(BINDER_DEBUG_THREADS,
1941                                      "binder: %d:%d BC_REGISTER_LOOPER\n",
1942                                      proc->pid, thread->pid);
1943                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1944                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1945                                 binder_user_error("binder: %d:%d ERROR:"
1946                                         " BC_REGISTER_LOOPER called "
1947                                         "after BC_ENTER_LOOPER\n",
1948                                         proc->pid, thread->pid);
1949                         } else if (proc->requested_threads == 0) {
1950                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1951                                 binder_user_error("binder: %d:%d ERROR:"
1952                                         " BC_REGISTER_LOOPER called "
1953                                         "without request\n",
1954                                         proc->pid, thread->pid);
1955                         } else {
1956                                 proc->requested_threads--;
1957                                 proc->requested_threads_started++;
1958                         }
1959                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1960                         break;
1961                 case BC_ENTER_LOOPER:
1962                         binder_debug(BINDER_DEBUG_THREADS,
1963                                      "binder: %d:%d BC_ENTER_LOOPER\n",
1964                                      proc->pid, thread->pid);
1965                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1966                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1967                                 binder_user_error("binder: %d:%d ERROR:"
1968                                         " BC_ENTER_LOOPER called after "
1969                                         "BC_REGISTER_LOOPER\n",
1970                                         proc->pid, thread->pid);
1971                         }
1972                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1973                         break;
1974                 case BC_EXIT_LOOPER:
1975                         binder_debug(BINDER_DEBUG_THREADS,
1976                                      "binder: %d:%d BC_EXIT_LOOPER\n",
1977                                      proc->pid, thread->pid);
1978                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1979                         break;
1980
1981                 case BC_REQUEST_DEATH_NOTIFICATION:
1982                 case BC_CLEAR_DEATH_NOTIFICATION: {
1983                         uint32_t target;
1984                         void __user *cookie;
1985                         struct binder_ref *ref;
1986                         struct binder_ref_death *death;
1987
1988                         if (get_user(target, (uint32_t __user *)ptr))
1989                                 return -EFAULT;
1990                         ptr += sizeof(uint32_t);
1991                         if (get_user(cookie, (void __user * __user *)ptr))
1992                                 return -EFAULT;
1993                         ptr += sizeof(void *);
1994                         ref = binder_get_ref(proc, target);
1995                         if (ref == NULL) {
1996                                 binder_user_error("binder: %d:%d %s "
1997                                         "invalid ref %d\n",
1998                                         proc->pid, thread->pid,
1999                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2000                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2001                                         "BC_CLEAR_DEATH_NOTIFICATION",
2002                                         target);
2003                                 break;
2004                         }
2005
2006                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2007                                      "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
2008                                      proc->pid, thread->pid,
2009                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2010                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2011                                      "BC_CLEAR_DEATH_NOTIFICATION",
2012                                      cookie, ref->debug_id, ref->desc,
2013                                      ref->strong, ref->weak, ref->node->debug_id);
2014
2015                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2016                                 if (ref->death) {
2017                                         binder_user_error("binder: %d:%"
2018                                                 "d BC_REQUEST_DEATH_NOTI"
2019                                                 "FICATION death notific"
2020                                                 "ation already set\n",
2021                                                 proc->pid, thread->pid);
2022                                         break;
2023                                 }
2024                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2025                                 if (death == NULL) {
2026                                         thread->return_error = BR_ERROR;
2027                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2028                                                      "binder: %d:%d "
2029                                                      "BC_REQUEST_DEATH_NOTIFICATION failed\n",
2030                                                      proc->pid, thread->pid);
2031                                         break;
2032                                 }
2033                                 binder_stats_created(BINDER_STAT_DEATH);
2034                                 INIT_LIST_HEAD(&death->work.entry);
2035                                 death->cookie = cookie;
2036                                 ref->death = death;
2037                                 if (ref->node->proc == NULL) {
2038                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2039                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2040                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2041                                         } else {
2042                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2043                                                 wake_up_interruptible(&proc->wait);
2044                                         }
2045                                 }
2046                         } else {
2047                                 if (ref->death == NULL) {
2048                                         binder_user_error("binder: %d:%"
2049                                                 "d BC_CLEAR_DEATH_NOTIFI"
2050                                                 "CATION death notificat"
2051                                                 "ion not active\n",
2052                                                 proc->pid, thread->pid);
2053                                         break;
2054                                 }
2055                                 death = ref->death;
2056                                 if (death->cookie != cookie) {
2057                                         binder_user_error("binder: %d:%"
2058                                                 "d BC_CLEAR_DEATH_NOTIFI"
2059                                                 "CATION death notificat"
2060                                                 "ion cookie mismatch "
2061                                                 "%p != %p\n",
2062                                                 proc->pid, thread->pid,
2063                                                 death->cookie, cookie);
2064                                         break;
2065                                 }
2066                                 ref->death = NULL;
2067                                 if (list_empty(&death->work.entry)) {
2068                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2069                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2070                                                 list_add_tail(&death->work.entry, &thread->todo);
2071                                         } else {
2072                                                 list_add_tail(&death->work.entry, &proc->todo);
2073                                                 wake_up_interruptible(&proc->wait);
2074                                         }
2075                                 } else {
2076                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2077                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2078                                 }
2079                         }
2080                 } break;
2081                 case BC_DEAD_BINDER_DONE: {
2082                         struct binder_work *w;
2083                         void __user *cookie;
2084                         struct binder_ref_death *death = NULL;
2085                         if (get_user(cookie, (void __user * __user *)ptr))
2086                                 return -EFAULT;
2087
2088                         ptr += sizeof(void *);
2089                         list_for_each_entry(w, &proc->delivered_death, entry) {
2090                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2091                                 if (tmp_death->cookie == cookie) {
2092                                         death = tmp_death;
2093                                         break;
2094                                 }
2095                         }
2096                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2097                                      "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2098                                      proc->pid, thread->pid, cookie, death);
2099                         if (death == NULL) {
2100                                 binder_user_error("binder: %d:%d BC_DEAD"
2101                                         "_BINDER_DONE %p not found\n",
2102                                         proc->pid, thread->pid, cookie);
2103                                 break;
2104                         }
2105
2106                         list_del_init(&death->work.entry);
2107                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2108                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2109                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2110                                         list_add_tail(&death->work.entry, &thread->todo);
2111                                 } else {
2112                                         list_add_tail(&death->work.entry, &proc->todo);
2113                                         wake_up_interruptible(&proc->wait);
2114                                 }
2115                         }
2116                 } break;
2117
2118                 default:
2119                         pr_err("binder: %d:%d unknown command %d\n",
2120                                proc->pid, thread->pid, cmd);
2121                         return -EINVAL;
2122                 }
2123                 *consumed = ptr - buffer;
2124         }
2125         return 0;
2126 }
2127
2128 void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2129                     uint32_t cmd)
2130 {
2131         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2132                 binder_stats.br[_IOC_NR(cmd)]++;
2133                 proc->stats.br[_IOC_NR(cmd)]++;
2134                 thread->stats.br[_IOC_NR(cmd)]++;
2135         }
2136 }
2137
2138 static int binder_has_proc_work(struct binder_proc *proc,
2139                                 struct binder_thread *thread)
2140 {
2141         return !list_empty(&proc->todo) ||
2142                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2143 }
2144
2145 static int binder_has_thread_work(struct binder_thread *thread)
2146 {
2147         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2148                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2149 }
2150
2151 static int binder_thread_read(struct binder_proc *proc,
2152                               struct binder_thread *thread,
2153                               void  __user *buffer, int size,
2154                               signed long *consumed, int non_block)
2155 {
2156         void __user *ptr = buffer + *consumed;
2157         void __user *end = buffer + size;
2158
2159         int ret = 0;
2160         int wait_for_proc_work;
2161
2162         if (*consumed == 0) {
2163                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2164                         return -EFAULT;
2165                 ptr += sizeof(uint32_t);
2166         }
2167
2168 retry:
2169         wait_for_proc_work = thread->transaction_stack == NULL &&
2170                                 list_empty(&thread->todo);
2171
2172         if (thread->return_error != BR_OK && ptr < end) {
2173                 if (thread->return_error2 != BR_OK) {
2174                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2175                                 return -EFAULT;
2176                         ptr += sizeof(uint32_t);
2177                         if (ptr == end)
2178                                 goto done;
2179                         thread->return_error2 = BR_OK;
2180                 }
2181                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2182                         return -EFAULT;
2183                 ptr += sizeof(uint32_t);
2184                 thread->return_error = BR_OK;
2185                 goto done;
2186         }
2187
2188
2189         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2190         if (wait_for_proc_work)
2191                 proc->ready_threads++;
2192         mutex_unlock(&binder_lock);
2193         if (wait_for_proc_work) {
2194                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2195                                         BINDER_LOOPER_STATE_ENTERED))) {
2196                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
2197                                 "for process work before calling BC_REGISTER_"
2198                                 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2199                                 proc->pid, thread->pid, thread->looper);
2200                         wait_event_interruptible(binder_user_error_wait,
2201                                                  binder_stop_on_user_error < 2);
2202                 }
2203                 binder_set_nice(proc->default_priority);
2204                 if (non_block) {
2205                         if (!binder_has_proc_work(proc, thread))
2206                                 ret = -EAGAIN;
2207                 } else
2208                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2209         } else {
2210                 if (non_block) {
2211                         if (!binder_has_thread_work(thread))
2212                                 ret = -EAGAIN;
2213                 } else
2214                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2215         }
2216         mutex_lock(&binder_lock);
2217         if (wait_for_proc_work)
2218                 proc->ready_threads--;
2219         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2220
2221         if (ret)
2222                 return ret;
2223
2224         while (1) {
2225                 uint32_t cmd;
2226                 struct binder_transaction_data tr;
2227                 struct binder_work *w;
2228                 struct binder_transaction *t = NULL;
2229
2230                 if (!list_empty(&thread->todo))
2231                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2232                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2233                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2234                 else {
2235                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2236                                 goto retry;
2237                         break;
2238                 }
2239
2240                 if (end - ptr < sizeof(tr) + 4)
2241                         break;
2242
2243                 switch (w->type) {
2244                 case BINDER_WORK_TRANSACTION: {
2245                         t = container_of(w, struct binder_transaction, work);
2246                 } break;
2247                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2248                         cmd = BR_TRANSACTION_COMPLETE;
2249                         if (put_user(cmd, (uint32_t __user *)ptr))
2250                                 return -EFAULT;
2251                         ptr += sizeof(uint32_t);
2252
2253                         binder_stat_br(proc, thread, cmd);
2254                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2255                                      "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2256                                      proc->pid, thread->pid);
2257
2258                         list_del(&w->entry);
2259                         kfree(w);
2260                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2261                 } break;
2262                 case BINDER_WORK_NODE: {
2263                         struct binder_node *node = container_of(w, struct binder_node, work);
2264                         uint32_t cmd = BR_NOOP;
2265                         const char *cmd_name;
2266                         int strong = node->internal_strong_refs || node->local_strong_refs;
2267                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2268                         if (weak && !node->has_weak_ref) {
2269                                 cmd = BR_INCREFS;
2270                                 cmd_name = "BR_INCREFS";
2271                                 node->has_weak_ref = 1;
2272                                 node->pending_weak_ref = 1;
2273                                 node->local_weak_refs++;
2274                         } else if (strong && !node->has_strong_ref) {
2275                                 cmd = BR_ACQUIRE;
2276                                 cmd_name = "BR_ACQUIRE";
2277                                 node->has_strong_ref = 1;
2278                                 node->pending_strong_ref = 1;
2279                                 node->local_strong_refs++;
2280                         } else if (!strong && node->has_strong_ref) {
2281                                 cmd = BR_RELEASE;
2282                                 cmd_name = "BR_RELEASE";
2283                                 node->has_strong_ref = 0;
2284                         } else if (!weak && node->has_weak_ref) {
2285                                 cmd = BR_DECREFS;
2286                                 cmd_name = "BR_DECREFS";
2287                                 node->has_weak_ref = 0;
2288                         }
2289                         if (cmd != BR_NOOP) {
2290                                 if (put_user(cmd, (uint32_t __user *)ptr))
2291                                         return -EFAULT;
2292                                 ptr += sizeof(uint32_t);
2293                                 if (put_user(node->ptr, (void * __user *)ptr))
2294                                         return -EFAULT;
2295                                 ptr += sizeof(void *);
2296                                 if (put_user(node->cookie, (void * __user *)ptr))
2297                                         return -EFAULT;
2298                                 ptr += sizeof(void *);
2299
2300                                 binder_stat_br(proc, thread, cmd);
2301                                 binder_debug(BINDER_DEBUG_USER_REFS,
2302                                              "binder: %d:%d %s %d u%p c%p\n",
2303                                              proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2304                         } else {
2305                                 list_del_init(&w->entry);
2306                                 if (!weak && !strong) {
2307                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2308                                                      "binder: %d:%d node %d u%p c%p deleted\n",
2309                                                      proc->pid, thread->pid, node->debug_id,
2310                                                      node->ptr, node->cookie);
2311                                         rb_erase(&node->rb_node, &proc->nodes);
2312                                         kfree(node);
2313                                         binder_stats_deleted(BINDER_STAT_NODE);
2314                                 } else {
2315                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2316                                                      "binder: %d:%d node %d u%p c%p state unchanged\n",
2317                                                      proc->pid, thread->pid, node->debug_id, node->ptr,
2318                                                      node->cookie);
2319                                 }
2320                         }
2321                 } break;
2322                 case BINDER_WORK_DEAD_BINDER:
2323                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2324                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2325                         struct binder_ref_death *death;
2326                         uint32_t cmd;
2327
2328                         death = container_of(w, struct binder_ref_death, work);
2329                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2330                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2331                         else
2332                                 cmd = BR_DEAD_BINDER;
2333                         if (put_user(cmd, (uint32_t __user *)ptr))
2334                                 return -EFAULT;
2335                         ptr += sizeof(uint32_t);
2336                         if (put_user(death->cookie, (void * __user *)ptr))
2337                                 return -EFAULT;
2338                         ptr += sizeof(void *);
2339                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2340                                      "binder: %d:%d %s %p\n",
2341                                       proc->pid, thread->pid,
2342                                       cmd == BR_DEAD_BINDER ?
2343                                       "BR_DEAD_BINDER" :
2344                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2345                                       death->cookie);
2346
2347                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2348                                 list_del(&w->entry);
2349                                 kfree(death);
2350                                 binder_stats_deleted(BINDER_STAT_DEATH);
2351                         } else
2352                                 list_move(&w->entry, &proc->delivered_death);
2353                         if (cmd == BR_DEAD_BINDER)
2354                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2355                 } break;
2356                 }
2357
2358                 if (!t)
2359                         continue;
2360
2361                 BUG_ON(t->buffer == NULL);
2362                 if (t->buffer->target_node) {
2363                         struct binder_node *target_node = t->buffer->target_node;
2364                         tr.target.ptr = target_node->ptr;
2365                         tr.cookie =  target_node->cookie;
2366                         t->saved_priority = task_nice(current);
2367                         if (t->priority < target_node->min_priority &&
2368                             !(t->flags & TF_ONE_WAY))
2369                                 binder_set_nice(t->priority);
2370                         else if (!(t->flags & TF_ONE_WAY) ||
2371                                  t->saved_priority > target_node->min_priority)
2372                                 binder_set_nice(target_node->min_priority);
2373                         cmd = BR_TRANSACTION;
2374                 } else {
2375                         tr.target.ptr = NULL;
2376                         tr.cookie = NULL;
2377                         cmd = BR_REPLY;
2378                 }
2379                 tr.code = t->code;
2380                 tr.flags = t->flags;
2381                 tr.sender_euid = t->sender_euid;
2382
2383                 if (t->from) {
2384                         struct task_struct *sender = t->from->proc->tsk;
2385                         tr.sender_pid = task_tgid_nr_ns(sender,
2386                                                         current->nsproxy->pid_ns);
2387                 } else {
2388                         tr.sender_pid = 0;
2389                 }
2390
2391                 tr.data_size = t->buffer->data_size;
2392                 tr.offsets_size = t->buffer->offsets_size;
2393                 tr.data.ptr.buffer = (void *)t->buffer->data +
2394                                         proc->user_buffer_offset;
2395                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2396                                         ALIGN(t->buffer->data_size,
2397                                             sizeof(void *));
2398
2399                 if (put_user(cmd, (uint32_t __user *)ptr))
2400                         return -EFAULT;
2401                 ptr += sizeof(uint32_t);
2402                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2403                         return -EFAULT;
2404                 ptr += sizeof(tr);
2405
2406                 binder_stat_br(proc, thread, cmd);
2407                 binder_debug(BINDER_DEBUG_TRANSACTION,
2408                              "binder: %d:%d %s %d %d:%d, cmd %d"
2409                              "size %zd-%zd ptr %p-%p\n",
2410                              proc->pid, thread->pid,
2411                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2412                              "BR_REPLY",
2413                              t->debug_id, t->from ? t->from->proc->pid : 0,
2414                              t->from ? t->from->pid : 0, cmd,
2415                              t->buffer->data_size, t->buffer->offsets_size,
2416                              tr.data.ptr.buffer, tr.data.ptr.offsets);
2417
2418                 list_del(&t->work.entry);
2419                 t->buffer->allow_user_free = 1;
2420                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2421                         t->to_parent = thread->transaction_stack;
2422                         t->to_thread = thread;
2423                         thread->transaction_stack = t;
2424                 } else {
2425                         t->buffer->transaction = NULL;
2426                         kfree(t);
2427                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2428                 }
2429                 break;
2430         }
2431
2432 done:
2433
2434         *consumed = ptr - buffer;
2435         if (proc->requested_threads + proc->ready_threads == 0 &&
2436             proc->requested_threads_started < proc->max_threads &&
2437             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2438              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2439              /*spawn a new thread if we leave this out */) {
2440                 proc->requested_threads++;
2441                 binder_debug(BINDER_DEBUG_THREADS,
2442                              "binder: %d:%d BR_SPAWN_LOOPER\n",
2443                              proc->pid, thread->pid);
2444                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2445                         return -EFAULT;
2446         }
2447         return 0;
2448 }
2449
2450 static void binder_release_work(struct list_head *list)
2451 {
2452         struct binder_work *w;
2453         while (!list_empty(list)) {
2454                 w = list_first_entry(list, struct binder_work, entry);
2455                 list_del_init(&w->entry);
2456                 switch (w->type) {
2457                 case BINDER_WORK_TRANSACTION: {
2458                         struct binder_transaction *t;
2459
2460                         t = container_of(w, struct binder_transaction, work);
2461                         if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
2462                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2463                 } break;
2464                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2465                         kfree(w);
2466                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2467                 } break;
2468                 default:
2469                         break;
2470                 }
2471         }
2472
2473 }
2474
2475 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2476 {
2477         struct binder_thread *thread = NULL;
2478         struct rb_node *parent = NULL;
2479         struct rb_node **p = &proc->threads.rb_node;
2480
2481         while (*p) {
2482                 parent = *p;
2483                 thread = rb_entry(parent, struct binder_thread, rb_node);
2484
2485                 if (current->pid < thread->pid)
2486                         p = &(*p)->rb_left;
2487                 else if (current->pid > thread->pid)
2488                         p = &(*p)->rb_right;
2489                 else
2490                         break;
2491         }
2492         if (*p == NULL) {
2493                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2494                 if (thread == NULL)
2495                         return NULL;
2496                 binder_stats_created(BINDER_STAT_THREAD);
2497                 thread->proc = proc;
2498                 thread->pid = current->pid;
2499                 init_waitqueue_head(&thread->wait);
2500                 INIT_LIST_HEAD(&thread->todo);
2501                 rb_link_node(&thread->rb_node, parent, p);
2502                 rb_insert_color(&thread->rb_node, &proc->threads);
2503                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2504                 thread->return_error = BR_OK;
2505                 thread->return_error2 = BR_OK;
2506         }
2507         return thread;
2508 }
2509
2510 static int binder_free_thread(struct binder_proc *proc,
2511                               struct binder_thread *thread)
2512 {
2513         struct binder_transaction *t;
2514         struct binder_transaction *send_reply = NULL;
2515         int active_transactions = 0;
2516
2517         rb_erase(&thread->rb_node, &proc->threads);
2518         t = thread->transaction_stack;
2519         if (t && t->to_thread == thread)
2520                 send_reply = t;
2521         while (t) {
2522                 active_transactions++;
2523                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2524                              "binder: release %d:%d transaction %d "
2525                              "%s, still active\n", proc->pid, thread->pid,
2526                              t->debug_id,
2527                              (t->to_thread == thread) ? "in" : "out");
2528
2529                 if (t->to_thread == thread) {
2530                         t->to_proc = NULL;
2531                         t->to_thread = NULL;
2532                         if (t->buffer) {
2533                                 t->buffer->transaction = NULL;
2534                                 t->buffer = NULL;
2535                         }
2536                         t = t->to_parent;
2537                 } else if (t->from == thread) {
2538                         t->from = NULL;
2539                         t = t->from_parent;
2540                 } else
2541                         BUG();
2542         }
2543         if (send_reply)
2544                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2545         binder_release_work(&thread->todo);
2546         kfree(thread);
2547         binder_stats_deleted(BINDER_STAT_THREAD);
2548         return active_transactions;
2549 }
2550
2551 static unsigned int binder_poll(struct file *filp,
2552                                 struct poll_table_struct *wait)
2553 {
2554         struct binder_proc *proc = filp->private_data;
2555         struct binder_thread *thread = NULL;
2556         int wait_for_proc_work;
2557
2558         mutex_lock(&binder_lock);
2559         thread = binder_get_thread(proc);
2560
2561         wait_for_proc_work = thread->transaction_stack == NULL &&
2562                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2563         mutex_unlock(&binder_lock);
2564
2565         if (wait_for_proc_work) {
2566                 if (binder_has_proc_work(proc, thread))
2567                         return POLLIN;
2568                 poll_wait(filp, &proc->wait, wait);
2569                 if (binder_has_proc_work(proc, thread))
2570                         return POLLIN;
2571         } else {
2572                 if (binder_has_thread_work(thread))
2573                         return POLLIN;
2574                 poll_wait(filp, &thread->wait, wait);
2575                 if (binder_has_thread_work(thread))
2576                         return POLLIN;
2577         }
2578         return 0;
2579 }
2580
2581 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2582 {
2583         int ret;
2584         struct binder_proc *proc = filp->private_data;
2585         struct binder_thread *thread;
2586         unsigned int size = _IOC_SIZE(cmd);
2587         void __user *ubuf = (void __user *)arg;
2588
2589         /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2590
2591         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2592         if (ret)
2593                 return ret;
2594
2595         mutex_lock(&binder_lock);
2596         thread = binder_get_thread(proc);
2597         if (thread == NULL) {
2598                 ret = -ENOMEM;
2599                 goto err;
2600         }
2601
2602         switch (cmd) {
2603         case BINDER_WRITE_READ: {
2604                 struct binder_write_read bwr;
2605                 if (size != sizeof(struct binder_write_read)) {
2606                         ret = -EINVAL;
2607                         goto err;
2608                 }
2609                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2610                         ret = -EFAULT;
2611                         goto err;
2612                 }
2613                 binder_debug(BINDER_DEBUG_READ_WRITE,
2614                              "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2615                              proc->pid, thread->pid, bwr.write_size, bwr.write_buffer,
2616                              bwr.read_size, bwr.read_buffer);
2617
2618                 if (bwr.write_size > 0) {
2619                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2620                         if (ret < 0) {
2621                                 bwr.read_consumed = 0;
2622                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2623                                         ret = -EFAULT;
2624                                 goto err;
2625                         }
2626                 }
2627                 if (bwr.read_size > 0) {
2628                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2629                         if (!list_empty(&proc->todo))
2630                                 wake_up_interruptible(&proc->wait);
2631                         if (ret < 0) {
2632                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2633                                         ret = -EFAULT;
2634                                 goto err;
2635                         }
2636                 }
2637                 binder_debug(BINDER_DEBUG_READ_WRITE,
2638                              "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2639                              proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2640                              bwr.read_consumed, bwr.read_size);
2641                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2642                         ret = -EFAULT;
2643                         goto err;
2644                 }
2645                 break;
2646         }
2647         case BINDER_SET_MAX_THREADS:
2648                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2649                         ret = -EINVAL;
2650                         goto err;
2651                 }
2652                 break;
2653         case BINDER_SET_CONTEXT_MGR:
2654                 if (binder_context_mgr_node != NULL) {
2655                         pr_err("binder: BINDER_SET_CONTEXT_MGR already set\n");
2656                         ret = -EBUSY;
2657                         goto err;
2658                 }
2659                 if (binder_context_mgr_uid != -1) {
2660                         if (binder_context_mgr_uid != current->cred->euid) {
2661                                 pr_err("binder: BINDER_SET_"
2662                                        "CONTEXT_MGR bad uid %d != %d\n",
2663                                        current->cred->euid,
2664                                        binder_context_mgr_uid);
2665                                 ret = -EPERM;
2666                                 goto err;
2667                         }
2668                 } else
2669                         binder_context_mgr_uid = current->cred->euid;
2670                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2671                 if (binder_context_mgr_node == NULL) {
2672                         ret = -ENOMEM;
2673                         goto err;
2674                 }
2675                 binder_context_mgr_node->local_weak_refs++;
2676                 binder_context_mgr_node->local_strong_refs++;
2677                 binder_context_mgr_node->has_strong_ref = 1;
2678                 binder_context_mgr_node->has_weak_ref = 1;
2679                 break;
2680         case BINDER_THREAD_EXIT:
2681                 binder_debug(BINDER_DEBUG_THREADS, "binder: %d:%d exit\n",
2682                              proc->pid, thread->pid);
2683                 binder_free_thread(proc, thread);
2684                 thread = NULL;
2685                 break;
2686         case BINDER_VERSION:
2687                 if (size != sizeof(struct binder_version)) {
2688                         ret = -EINVAL;
2689                         goto err;
2690                 }
2691                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2692                         ret = -EINVAL;
2693                         goto err;
2694                 }
2695                 break;
2696         default:
2697                 ret = -EINVAL;
2698                 goto err;
2699         }
2700         ret = 0;
2701 err:
2702         if (thread)
2703                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2704         mutex_unlock(&binder_lock);
2705         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2706         if (ret && ret != -ERESTARTSYS)
2707                 pr_info("binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2708         return ret;
2709 }
2710
2711 static void binder_vma_open(struct vm_area_struct *vma)
2712 {
2713         struct binder_proc *proc = vma->vm_private_data;
2714         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2715                      "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2716                      proc->pid, vma->vm_start, vma->vm_end,
2717                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2718                      (unsigned long)pgprot_val(vma->vm_page_prot));
2719 }
2720
2721 static void binder_vma_close(struct vm_area_struct *vma)
2722 {
2723         struct binder_proc *proc = vma->vm_private_data;
2724         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2725                      "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2726                      proc->pid, vma->vm_start, vma->vm_end,
2727                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2728                      (unsigned long)pgprot_val(vma->vm_page_prot));
2729         proc->vma = NULL;
2730         proc->vma_vm_mm = NULL;
2731         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2732 }
2733
2734 static struct vm_operations_struct binder_vm_ops = {
2735         .open = binder_vma_open,
2736         .close = binder_vma_close,
2737 };
2738
2739 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2740 {
2741         int ret;
2742         struct vm_struct *area;
2743         struct binder_proc *proc = filp->private_data;
2744         const char *failure_string;
2745         struct binder_buffer *buffer;
2746
2747         if (proc->tsk != current)
2748                 return -EINVAL;
2749
2750         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2751                 vma->vm_end = vma->vm_start + SZ_4M;
2752
2753         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2754                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2755                      proc->pid, vma->vm_start, vma->vm_end,
2756                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2757                      (unsigned long)pgprot_val(vma->vm_page_prot));
2758
2759         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2760                 ret = -EPERM;
2761                 failure_string = "bad vm_flags";
2762                 goto err_bad_arg;
2763         }
2764         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2765
2766         mutex_lock(&binder_mmap_lock);
2767         if (proc->buffer) {
2768                 ret = -EBUSY;
2769                 failure_string = "already mapped";
2770                 goto err_already_mapped;
2771         }
2772
2773         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2774         if (area == NULL) {
2775                 ret = -ENOMEM;
2776                 failure_string = "get_vm_area";
2777                 goto err_get_vm_area_failed;
2778         }
2779         proc->buffer = area->addr;
2780         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2781         mutex_unlock(&binder_mmap_lock);
2782
2783 #ifdef CONFIG_CPU_CACHE_VIPT
2784         if (cache_is_vipt_aliasing()) {
2785                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2786                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2787                         vma->vm_start += PAGE_SIZE;
2788                 }
2789         }
2790 #endif
2791         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2792         if (proc->pages == NULL) {
2793                 ret = -ENOMEM;
2794                 failure_string = "alloc page array";
2795                 goto err_alloc_pages_failed;
2796         }
2797         proc->buffer_size = vma->vm_end - vma->vm_start;
2798
2799         vma->vm_ops = &binder_vm_ops;
2800         vma->vm_private_data = proc;
2801
2802         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2803                 ret = -ENOMEM;
2804                 failure_string = "alloc small buf";
2805                 goto err_alloc_small_buf_failed;
2806         }
2807         buffer = proc->buffer;
2808         INIT_LIST_HEAD(&proc->buffers);
2809         list_add(&buffer->entry, &proc->buffers);
2810         buffer->free = 1;
2811         binder_insert_free_buffer(proc, buffer);
2812         proc->free_async_space = proc->buffer_size / 2;
2813         barrier();
2814         proc->files = get_files_struct(current);
2815         proc->vma = vma;
2816         proc->vma_vm_mm = vma->vm_mm;
2817
2818         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2819                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2820         return 0;
2821
2822 err_alloc_small_buf_failed:
2823         kfree(proc->pages);
2824         proc->pages = NULL;
2825 err_alloc_pages_failed:
2826         mutex_lock(&binder_mmap_lock);
2827         vfree(proc->buffer);
2828         proc->buffer = NULL;
2829 err_get_vm_area_failed:
2830 err_already_mapped:
2831         mutex_unlock(&binder_mmap_lock);
2832 err_bad_arg:
2833         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2834                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2835         return ret;
2836 }
2837
2838 static int binder_open(struct inode *nodp, struct file *filp)
2839 {
2840         struct binder_proc *proc;
2841
2842         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2843                      current->group_leader->pid, current->pid);
2844
2845         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2846         if (proc == NULL)
2847                 return -ENOMEM;
2848         get_task_struct(current);
2849         proc->tsk = current;
2850         INIT_LIST_HEAD(&proc->todo);
2851         init_waitqueue_head(&proc->wait);
2852         proc->default_priority = task_nice(current);
2853         mutex_lock(&binder_lock);
2854         binder_stats_created(BINDER_STAT_PROC);
2855         hlist_add_head(&proc->proc_node, &binder_procs);
2856         proc->pid = current->group_leader->pid;
2857         INIT_LIST_HEAD(&proc->delivered_death);
2858         filp->private_data = proc;
2859         mutex_unlock(&binder_lock);
2860
2861         if (binder_debugfs_dir_entry_proc) {
2862                 char strbuf[11];
2863                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2864                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2865                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2866         }
2867
2868         return 0;
2869 }
2870
2871 static int binder_flush(struct file *filp, fl_owner_t id)
2872 {
2873         struct binder_proc *proc = filp->private_data;
2874
2875         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2876
2877         return 0;
2878 }
2879
2880 static void binder_deferred_flush(struct binder_proc *proc)
2881 {
2882         struct rb_node *n;
2883         int wake_count = 0;
2884         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2885                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2886                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2887                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2888                         wake_up_interruptible(&thread->wait);
2889                         wake_count++;
2890                 }
2891         }
2892         wake_up_interruptible_all(&proc->wait);
2893
2894         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2895                      "binder_flush: %d woke %d threads\n", proc->pid,
2896                      wake_count);
2897 }
2898
2899 static int binder_release(struct inode *nodp, struct file *filp)
2900 {
2901         struct binder_proc *proc = filp->private_data;
2902         debugfs_remove(proc->debugfs_entry);
2903         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2904
2905         return 0;
2906 }
2907
2908 static void binder_deferred_release(struct binder_proc *proc)
2909 {
2910         struct hlist_node *pos;
2911         struct binder_transaction *t;
2912         struct rb_node *n;
2913         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2914
2915         BUG_ON(proc->vma);
2916         BUG_ON(proc->files);
2917
2918         hlist_del(&proc->proc_node);
2919         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2920                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2921                              "binder_release: %d context_mgr_node gone\n",
2922                              proc->pid);
2923                 binder_context_mgr_node = NULL;
2924         }
2925
2926         threads = 0;
2927         active_transactions = 0;
2928         while ((n = rb_first(&proc->threads))) {
2929                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2930                 threads++;
2931                 active_transactions += binder_free_thread(proc, thread);
2932         }
2933         nodes = 0;
2934         incoming_refs = 0;
2935         while ((n = rb_first(&proc->nodes))) {
2936                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2937
2938                 nodes++;
2939                 rb_erase(&node->rb_node, &proc->nodes);
2940                 list_del_init(&node->work.entry);
2941                 if (hlist_empty(&node->refs)) {
2942                         kfree(node);
2943                         binder_stats_deleted(BINDER_STAT_NODE);
2944                 } else {
2945                         struct binder_ref *ref;
2946                         int death = 0;
2947
2948                         node->proc = NULL;
2949                         node->local_strong_refs = 0;
2950                         node->local_weak_refs = 0;
2951                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2952
2953                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2954                                 incoming_refs++;
2955                                 if (ref->death) {
2956                                         death++;
2957                                         if (list_empty(&ref->death->work.entry)) {
2958                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2959                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2960                                                 wake_up_interruptible(&ref->proc->wait);
2961                                         } else
2962                                                 BUG();
2963                                 }
2964                         }
2965                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2966                                      "binder: node %d now dead, "
2967                                      "refs %d, death %d\n", node->debug_id,
2968                                      incoming_refs, death);
2969                 }
2970         }
2971         outgoing_refs = 0;
2972         while ((n = rb_first(&proc->refs_by_desc))) {
2973                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
2974                                                   rb_node_desc);
2975                 outgoing_refs++;
2976                 binder_delete_ref(ref);
2977         }
2978         binder_release_work(&proc->todo);
2979         buffers = 0;
2980
2981         while ((n = rb_first(&proc->allocated_buffers))) {
2982                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
2983                                                         rb_node);
2984                 t = buffer->transaction;
2985                 if (t) {
2986                         t->buffer = NULL;
2987                         buffer->transaction = NULL;
2988                         pr_err("binder: release proc %d, "
2989                                "transaction %d, not freed\n",
2990                                proc->pid, t->debug_id);
2991                         /*BUG();*/
2992                 }
2993                 binder_free_buf(proc, buffer);
2994                 buffers++;
2995         }
2996
2997         binder_stats_deleted(BINDER_STAT_PROC);
2998
2999         page_count = 0;
3000         if (proc->pages) {
3001                 int i;
3002                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3003                         if (proc->pages[i]) {
3004                                 void *page_addr = proc->buffer + i * PAGE_SIZE;
3005                                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3006                                              "binder_release: %d: "
3007                                              "page %d at %p not freed\n",
3008                                              proc->pid, i,
3009                                              page_addr);
3010                                 unmap_kernel_range((unsigned long)page_addr,
3011                                         PAGE_SIZE);
3012                                 __free_page(proc->pages[i]);
3013                                 page_count++;
3014                         }
3015                 }
3016                 kfree(proc->pages);
3017                 vfree(proc->buffer);
3018         }
3019
3020         put_task_struct(proc->tsk);
3021
3022         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3023                      "binder_release: %d threads %d, nodes %d (ref %d), "
3024                      "refs %d, active transactions %d, buffers %d, "
3025                      "pages %d\n",
3026                      proc->pid, threads, nodes, incoming_refs, outgoing_refs,
3027                      active_transactions, buffers, page_count);
3028
3029         kfree(proc);
3030 }
3031
3032 static void binder_deferred_func(struct work_struct *work)
3033 {
3034         struct binder_proc *proc;
3035         struct files_struct *files;
3036
3037         int defer;
3038         do {
3039                 mutex_lock(&binder_lock);
3040                 mutex_lock(&binder_deferred_lock);
3041                 if (!hlist_empty(&binder_deferred_list)) {
3042                         proc = hlist_entry(binder_deferred_list.first,
3043                                         struct binder_proc, deferred_work_node);
3044                         hlist_del_init(&proc->deferred_work_node);
3045                         defer = proc->deferred_work;
3046                         proc->deferred_work = 0;
3047                 } else {
3048                         proc = NULL;
3049                         defer = 0;
3050                 }
3051                 mutex_unlock(&binder_deferred_lock);
3052
3053                 files = NULL;
3054                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3055                         files = proc->files;
3056                         if (files)
3057                                 proc->files = NULL;
3058                 }
3059
3060                 if (defer & BINDER_DEFERRED_FLUSH)
3061                         binder_deferred_flush(proc);
3062
3063                 if (defer & BINDER_DEFERRED_RELEASE)
3064                         binder_deferred_release(proc); /* frees proc */
3065
3066                 mutex_unlock(&binder_lock);
3067                 if (files)
3068                         put_files_struct(files);
3069         } while (proc);
3070 }
3071 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3072
3073 static void
3074 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3075 {
3076         mutex_lock(&binder_deferred_lock);
3077         proc->deferred_work |= defer;
3078         if (hlist_unhashed(&proc->deferred_work_node)) {
3079                 hlist_add_head(&proc->deferred_work_node,
3080                                 &binder_deferred_list);
3081                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3082         }
3083         mutex_unlock(&binder_deferred_lock);
3084 }
3085
3086 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3087                                      struct binder_transaction *t)
3088 {
3089         seq_printf(m,
3090                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3091                    prefix, t->debug_id, t,
3092                    t->from ? t->from->proc->pid : 0,
3093                    t->from ? t->from->pid : 0,
3094                    t->to_proc ? t->to_proc->pid : 0,
3095                    t->to_thread ? t->to_thread->pid : 0,
3096                    t->code, t->flags, t->priority, t->need_reply);
3097         if (t->buffer == NULL) {
3098                 seq_puts(m, " buffer free\n");
3099                 return;
3100         }
3101         if (t->buffer->target_node)
3102                 seq_printf(m, " node %d",
3103                            t->buffer->target_node->debug_id);
3104         seq_printf(m, " size %zd:%zd data %p\n",
3105                    t->buffer->data_size, t->buffer->offsets_size,
3106                    t->buffer->data);
3107 }
3108
3109 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3110                                 struct binder_buffer *buffer)
3111 {
3112         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3113                    prefix, buffer->debug_id, buffer->data,
3114                    buffer->data_size, buffer->offsets_size,
3115                    buffer->transaction ? "active" : "delivered");
3116 }
3117
3118 static void print_binder_work(struct seq_file *m, const char *prefix,
3119                               const char *transaction_prefix,
3120                               struct binder_work *w)
3121 {
3122         struct binder_node *node;
3123         struct binder_transaction *t;
3124
3125         switch (w->type) {
3126         case BINDER_WORK_TRANSACTION:
3127                 t = container_of(w, struct binder_transaction, work);
3128                 print_binder_transaction(m, transaction_prefix, t);
3129                 break;
3130         case BINDER_WORK_TRANSACTION_COMPLETE:
3131                 seq_printf(m, "%stransaction complete\n", prefix);
3132                 break;
3133         case BINDER_WORK_NODE:
3134                 node = container_of(w, struct binder_node, work);
3135                 seq_printf(m, "%snode work %d: u%p c%p\n",
3136                            prefix, node->debug_id, node->ptr, node->cookie);
3137                 break;
3138         case BINDER_WORK_DEAD_BINDER:
3139                 seq_printf(m, "%shas dead binder\n", prefix);
3140                 break;
3141         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3142                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3143                 break;
3144         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3145                 seq_printf(m, "%shas cleared death notification\n", prefix);
3146                 break;
3147         default:
3148                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3149                 break;
3150         }
3151 }
3152
3153 static void print_binder_thread(struct seq_file *m,
3154                                 struct binder_thread *thread,
3155                                 int print_always)
3156 {
3157         struct binder_transaction *t;
3158         struct binder_work *w;
3159         size_t start_pos = m->count;
3160         size_t header_pos;
3161
3162         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3163         header_pos = m->count;
3164         t = thread->transaction_stack;
3165         while (t) {
3166                 if (t->from == thread) {
3167                         print_binder_transaction(m,
3168                                                  "    outgoing transaction", t);
3169                         t = t->from_parent;
3170                 } else if (t->to_thread == thread) {
3171                         print_binder_transaction(m,
3172                                                  "    incoming transaction", t);
3173                         t = t->to_parent;
3174                 } else {
3175                         print_binder_transaction(m, "    bad transaction", t);
3176                         t = NULL;
3177                 }
3178         }
3179         list_for_each_entry(w, &thread->todo, entry) {
3180                 print_binder_work(m, "    ", "    pending transaction", w);
3181         }
3182         if (!print_always && m->count == header_pos)
3183                 m->count = start_pos;
3184 }
3185
3186 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3187 {
3188         struct binder_ref *ref;
3189         struct hlist_node *pos;
3190         struct binder_work *w;
3191         int count;
3192
3193         count = 0;
3194         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3195                 count++;
3196
3197         seq_printf(m, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3198                    node->debug_id, node->ptr, node->cookie,
3199                    node->has_strong_ref, node->has_weak_ref,
3200                    node->local_strong_refs, node->local_weak_refs,
3201                    node->internal_strong_refs, count);
3202         if (count) {
3203                 seq_puts(m, " proc");
3204                 hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3205                         seq_printf(m, " %d", ref->proc->pid);
3206         }
3207         seq_puts(m, "\n");
3208         list_for_each_entry(w, &node->async_todo, entry)
3209                 print_binder_work(m, "    ",
3210                                   "    pending async transaction", w);
3211 }
3212
3213 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3214 {
3215         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3216                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3217                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3218 }
3219
3220 static void print_binder_proc(struct seq_file *m,
3221                               struct binder_proc *proc, int print_all)
3222 {
3223         struct binder_work *w;
3224         struct rb_node *n;
3225         size_t start_pos = m->count;
3226         size_t header_pos;
3227
3228         seq_printf(m, "proc %d\n", proc->pid);
3229         header_pos = m->count;
3230
3231         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3232                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3233                                                 rb_node), print_all);
3234         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3235                 struct binder_node *node = rb_entry(n, struct binder_node,
3236                                                     rb_node);
3237                 if (print_all || node->has_async_transaction)
3238                         print_binder_node(m, node);
3239         }
3240         if (print_all) {
3241                 for (n = rb_first(&proc->refs_by_desc);
3242                      n != NULL;
3243                      n = rb_next(n))
3244                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3245                                                      rb_node_desc));
3246         }
3247         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3248                 print_binder_buffer(m, "  buffer",
3249                                     rb_entry(n, struct binder_buffer, rb_node));
3250         list_for_each_entry(w, &proc->todo, entry)
3251                 print_binder_work(m, "  ", "  pending transaction", w);
3252         list_for_each_entry(w, &proc->delivered_death, entry) {
3253                 seq_puts(m, "  has delivered dead binder\n");
3254                 break;
3255         }
3256         if (!print_all && m->count == header_pos)
3257                 m->count = start_pos;
3258 }
3259
3260 static const char *binder_return_strings[] = {
3261         "BR_ERROR",
3262         "BR_OK",
3263         "BR_TRANSACTION",
3264         "BR_REPLY",
3265         "BR_ACQUIRE_RESULT",
3266         "BR_DEAD_REPLY",
3267         "BR_TRANSACTION_COMPLETE",
3268         "BR_INCREFS",
3269         "BR_ACQUIRE",
3270         "BR_RELEASE",
3271         "BR_DECREFS",
3272         "BR_ATTEMPT_ACQUIRE",
3273         "BR_NOOP",
3274         "BR_SPAWN_LOOPER",
3275         "BR_FINISHED",
3276         "BR_DEAD_BINDER",
3277         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3278         "BR_FAILED_REPLY"
3279 };
3280
3281 static const char *binder_command_strings[] = {
3282         "BC_TRANSACTION",
3283         "BC_REPLY",
3284         "BC_ACQUIRE_RESULT",
3285         "BC_FREE_BUFFER",
3286         "BC_INCREFS",
3287         "BC_ACQUIRE",
3288         "BC_RELEASE",
3289         "BC_DECREFS",
3290         "BC_INCREFS_DONE",
3291         "BC_ACQUIRE_DONE",
3292         "BC_ATTEMPT_ACQUIRE",
3293         "BC_REGISTER_LOOPER",
3294         "BC_ENTER_LOOPER",
3295         "BC_EXIT_LOOPER",
3296         "BC_REQUEST_DEATH_NOTIFICATION",
3297         "BC_CLEAR_DEATH_NOTIFICATION",
3298         "BC_DEAD_BINDER_DONE"
3299 };
3300
3301 static const char *binder_objstat_strings[] = {
3302         "proc",
3303         "thread",
3304         "node",
3305         "ref",
3306         "death",
3307         "transaction",
3308         "transaction_complete"
3309 };
3310
3311 static void print_binder_stats(struct seq_file *m, const char *prefix,
3312                                struct binder_stats *stats)
3313 {
3314         int i;
3315
3316         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3317                      ARRAY_SIZE(binder_command_strings));
3318         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3319                 if (stats->bc[i])
3320                         seq_printf(m, "%s%s: %d\n", prefix,
3321                                    binder_command_strings[i], stats->bc[i]);
3322         }
3323
3324         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3325                      ARRAY_SIZE(binder_return_strings));
3326         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3327                 if (stats->br[i])
3328                         seq_printf(m, "%s%s: %d\n", prefix,
3329                                    binder_return_strings[i], stats->br[i]);
3330         }
3331
3332         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3333                      ARRAY_SIZE(binder_objstat_strings));
3334         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3335                      ARRAY_SIZE(stats->obj_deleted));
3336         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3337                 if (stats->obj_created[i] || stats->obj_deleted[i])
3338                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3339                                 binder_objstat_strings[i],
3340                                 stats->obj_created[i] - stats->obj_deleted[i],
3341                                 stats->obj_created[i]);
3342         }
3343 }
3344
3345 static void print_binder_proc_stats(struct seq_file *m,
3346                                     struct binder_proc *proc)
3347 {
3348         struct binder_work *w;
3349         struct rb_node *n;
3350         int count, strong, weak;
3351
3352         seq_printf(m, "proc %d\n", proc->pid);
3353         count = 0;
3354         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3355                 count++;
3356         seq_printf(m, "  threads: %d\n", count);
3357         seq_printf(m, "  requested threads: %d+%d/%d\n"
3358                         "  ready threads %d\n"
3359                         "  free async space %zd\n", proc->requested_threads,
3360                         proc->requested_threads_started, proc->max_threads,
3361                         proc->ready_threads, proc->free_async_space);
3362         count = 0;
3363         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3364                 count++;
3365         seq_printf(m, "  nodes: %d\n", count);
3366         count = 0;
3367         strong = 0;
3368         weak = 0;
3369         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3370                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3371                                                   rb_node_desc);
3372                 count++;
3373                 strong += ref->strong;
3374                 weak += ref->weak;
3375         }
3376         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3377
3378         count = 0;
3379         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3380                 count++;
3381         seq_printf(m, "  buffers: %d\n", count);
3382
3383         count = 0;
3384         list_for_each_entry(w, &proc->todo, entry) {
3385                 switch (w->type) {
3386                 case BINDER_WORK_TRANSACTION:
3387                         count++;
3388                         break;
3389                 default:
3390                         break;
3391                 }
3392         }
3393         seq_printf(m, "  pending transactions: %d\n", count);
3394
3395         print_binder_stats(m, "  ", &proc->stats);
3396 }
3397
3398
3399 static int binder_state_show(struct seq_file *m, void *unused)
3400 {
3401         struct binder_proc *proc;
3402         struct hlist_node *pos;
3403         struct binder_node *node;
3404         int do_lock = !binder_debug_no_lock;
3405
3406         if (do_lock)
3407                 mutex_lock(&binder_lock);
3408
3409         seq_puts(m, "binder state:\n");
3410
3411         if (!hlist_empty(&binder_dead_nodes))
3412                 seq_puts(m, "dead nodes:\n");
3413         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node)
3414                 print_binder_node(m, node);
3415
3416         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3417                 print_binder_proc(m, proc, 1);
3418         if (do_lock)
3419                 mutex_unlock(&binder_lock);
3420         return 0;
3421 }
3422
3423 static int binder_stats_show(struct seq_file *m, void *unused)
3424 {
3425         struct binder_proc *proc;
3426         struct hlist_node *pos;
3427         int do_lock = !binder_debug_no_lock;
3428
3429         if (do_lock)
3430                 mutex_lock(&binder_lock);
3431
3432         seq_puts(m, "binder stats:\n");
3433
3434         print_binder_stats(m, "", &binder_stats);
3435
3436         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3437                 print_binder_proc_stats(m, proc);
3438         if (do_lock)
3439                 mutex_unlock(&binder_lock);
3440         return 0;
3441 }
3442
3443 static int binder_transactions_show(struct seq_file *m, void *unused)
3444 {
3445         struct binder_proc *proc;
3446         struct hlist_node *pos;
3447         int do_lock = !binder_debug_no_lock;
3448
3449         if (do_lock)
3450                 mutex_lock(&binder_lock);
3451
3452         seq_puts(m, "binder transactions:\n");
3453         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3454                 print_binder_proc(m, proc, 0);
3455         if (do_lock)
3456                 mutex_unlock(&binder_lock);
3457         return 0;
3458 }
3459
3460 static int binder_proc_show(struct seq_file *m, void *unused)
3461 {
3462         struct binder_proc *proc = m->private;
3463         int do_lock = !binder_debug_no_lock;
3464
3465         if (do_lock)
3466                 mutex_lock(&binder_lock);
3467         seq_puts(m, "binder proc state:\n");
3468         print_binder_proc(m, proc, 1);
3469         if (do_lock)
3470                 mutex_unlock(&binder_lock);
3471         return 0;
3472 }
3473
3474 static void print_binder_transaction_log_entry(struct seq_file *m,
3475                                         struct binder_transaction_log_entry *e)
3476 {
3477         seq_printf(m,
3478                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3479                    e->debug_id, (e->call_type == 2) ? "reply" :
3480                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3481                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3482                    e->target_handle, e->data_size, e->offsets_size);
3483 }
3484
3485 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3486 {
3487         struct binder_transaction_log *log = m->private;
3488         int i;
3489
3490         if (log->full) {
3491                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3492                         print_binder_transaction_log_entry(m, &log->entry[i]);
3493         }
3494         for (i = 0; i < log->next; i++)
3495                 print_binder_transaction_log_entry(m, &log->entry[i]);
3496         return 0;
3497 }
3498
3499 static const struct file_operations binder_fops = {
3500         .owner = THIS_MODULE,
3501         .poll = binder_poll,
3502         .unlocked_ioctl = binder_ioctl,
3503         .mmap = binder_mmap,
3504         .open = binder_open,
3505         .flush = binder_flush,
3506         .release = binder_release,
3507 };
3508
3509 static struct miscdevice binder_miscdev = {
3510         .minor = MISC_DYNAMIC_MINOR,
3511         .name = "binder",
3512         .fops = &binder_fops
3513 };
3514
3515 BINDER_DEBUG_ENTRY(state);
3516 BINDER_DEBUG_ENTRY(stats);
3517 BINDER_DEBUG_ENTRY(transactions);
3518 BINDER_DEBUG_ENTRY(transaction_log);
3519
3520 static int __init binder_init(void)
3521 {
3522         int ret;
3523
3524         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3525         if (!binder_deferred_workqueue)
3526                 return -ENOMEM;
3527
3528         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3529         if (binder_debugfs_dir_entry_root)
3530                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3531                                                  binder_debugfs_dir_entry_root);
3532         ret = misc_register(&binder_miscdev);
3533         if (binder_debugfs_dir_entry_root) {
3534                 debugfs_create_file("state",
3535                                     S_IRUGO,
3536                                     binder_debugfs_dir_entry_root,
3537                                     NULL,
3538                                     &binder_state_fops);
3539                 debugfs_create_file("stats",
3540                                     S_IRUGO,
3541                                     binder_debugfs_dir_entry_root,
3542                                     NULL,
3543                                     &binder_stats_fops);
3544                 debugfs_create_file("transactions",
3545                                     S_IRUGO,
3546                                     binder_debugfs_dir_entry_root,
3547                                     NULL,
3548                                     &binder_transactions_fops);
3549                 debugfs_create_file("transaction_log",
3550                                     S_IRUGO,
3551                                     binder_debugfs_dir_entry_root,
3552                                     &binder_transaction_log,
3553                                     &binder_transaction_log_fops);
3554                 debugfs_create_file("failed_transaction_log",
3555                                     S_IRUGO,
3556                                     binder_debugfs_dir_entry_root,
3557                                     &binder_transaction_log_failed,
3558                                     &binder_transaction_log_fops);
3559         }
3560         return ret;
3561 }
3562
3563 device_initcall(binder_init);
3564
3565 MODULE_LICENSE("GPL v2");