Pileus Git - ~andy/linux/blob - 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <asm/cacheflush.h>
  21 #include <linux/fdtable.h>
  22 #include <linux/file.h>
  23 #include <linux/freezer.h>
  24 #include <linux/fs.h>
  25 #include <linux/list.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/nsproxy.h>
  31 #include <linux/poll.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/rbtree.h>
  34 #include <linux/sched.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/pid_namespace.h>
  40
  41 #include "binder.h"
  42 #include "binder_trace.h"
  43
  44 static DEFINE_MUTEX(binder_main_lock);
  45 static DEFINE_MUTEX(binder_deferred_lock);
  46 static DEFINE_MUTEX(binder_mmap_lock);
  47
  48 static HLIST_HEAD(binder_procs);
  49 static HLIST_HEAD(binder_deferred_list);
  50 static HLIST_HEAD(binder_dead_nodes);
  51
  52 static struct dentry *binder_debugfs_dir_entry_root;
  53 static struct dentry *binder_debugfs_dir_entry_proc;
  54 static struct binder_node *binder_context_mgr_node;
  55 static kuid_t binder_context_mgr_uid = INVALID_UID;
  56 static int binder_last_id;
  57 static struct workqueue_struct *binder_deferred_workqueue;
  58
  59 #define BINDER_DEBUG_ENTRY(name) \
  60 static int binder_##name##_open(struct inode *inode, struct file *file) \
  61 { \
  62         return single_open(file, binder_##name##_show, inode->i_private); \
  63 } \
  64 \
  65 static const struct file_operations binder_##name##_fops = { \
  66         .owner = THIS_MODULE, \
  67         .open = binder_##name##_open, \
  68         .read = seq_read, \
  69         .llseek = seq_lseek, \
  70         .release = single_release, \
  71 }
  72
  73 static int binder_proc_show(struct seq_file *m, void *unused);
  74 BINDER_DEBUG_ENTRY(proc);
  75
  76 /* This is only defined in include/asm-arm/sizes.h */
  77 #ifndef SZ_1K
  78 #define SZ_1K                               0x400
  79 #endif
  80
  81 #ifndef SZ_4M
  82 #define SZ_4M                               0x400000
  83 #endif
  84
  85 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  86
  87 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  88
  89 enum {
  90         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  91         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  92         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  93         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  94         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  95         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
  96         BINDER_DEBUG_READ_WRITE             = 1U << 6,
  97         BINDER_DEBUG_USER_REFS              = 1U << 7,
  98         BINDER_DEBUG_THREADS                = 1U << 8,
  99         BINDER_DEBUG_TRANSACTION            = 1U << 9,
 100         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 101         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 102         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 103         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 104         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 105         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 106 };
 107 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 108         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 109 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 110
 111 static bool binder_debug_no_lock;
 112 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 113
 114 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 115 static int binder_stop_on_user_error;
 116
 117 static int binder_set_stop_on_user_error(const char *val,
 118                                          struct kernel_param *kp)
 119 {
 120         int ret;
 121         ret = param_set_int(val, kp);
 122         if (binder_stop_on_user_error < 2)
 123                 wake_up(&binder_user_error_wait);
 124         return ret;
 125 }
 126 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 127         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 128
 129 #define binder_debug(mask, x...) \
 130         do { \
 131                 if (binder_debug_mask & mask) \
 132                         pr_info(x); \
 133         } while (0)
 134
 135 #define binder_user_error(x...) \
 136         do { \
 137                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 138                         pr_info(x); \
 139                 if (binder_stop_on_user_error) \
 140                         binder_stop_on_user_error = 2; \
 141         } while (0)
 142
 143 enum binder_stat_types {
 144         BINDER_STAT_PROC,
 145         BINDER_STAT_THREAD,
 146         BINDER_STAT_NODE,
 147         BINDER_STAT_REF,
 148         BINDER_STAT_DEATH,
 149         BINDER_STAT_TRANSACTION,
 150         BINDER_STAT_TRANSACTION_COMPLETE,
 151         BINDER_STAT_COUNT
 152 };
 153
 154 struct binder_stats {
 155         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 156         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 157         int obj_created[BINDER_STAT_COUNT];
 158         int obj_deleted[BINDER_STAT_COUNT];
 159 };
 160
 161 static struct binder_stats binder_stats;
 162
 163 static inline void binder_stats_deleted(enum binder_stat_types type)
 164 {
 165         binder_stats.obj_deleted[type]++;
 166 }
 167
 168 static inline void binder_stats_created(enum binder_stat_types type)
 169 {
 170         binder_stats.obj_created[type]++;
 171 }
 172
 173 struct binder_transaction_log_entry {
 174         int debug_id;
 175         int call_type;
 176         int from_proc;
 177         int from_thread;
 178         int target_handle;
 179         int to_proc;
 180         int to_thread;
 181         int to_node;
 182         int data_size;
 183         int offsets_size;
 184 };
 185 struct binder_transaction_log {
 186         int next;
 187         int full;
 188         struct binder_transaction_log_entry entry[32];
 189 };
 190 static struct binder_transaction_log binder_transaction_log;
 191 static struct binder_transaction_log binder_transaction_log_failed;
 192
 193 static struct binder_transaction_log_entry *binder_transaction_log_add(
 194         struct binder_transaction_log *log)
 195 {
 196         struct binder_transaction_log_entry *e;
 197         e = &log->entry[log->next];
 198         memset(e, 0, sizeof(*e));
 199         log->next++;
 200         if (log->next == ARRAY_SIZE(log->entry)) {
 201                 log->next = 0;
 202                 log->full = 1;
 203         }
 204         return e;
 205 }
 206
 207 struct binder_work {
 208         struct list_head entry;
 209         enum {
 210                 BINDER_WORK_TRANSACTION = 1,
 211                 BINDER_WORK_TRANSACTION_COMPLETE,
 212                 BINDER_WORK_NODE,
 213                 BINDER_WORK_DEAD_BINDER,
 214                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 215                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 216         } type;
 217 };
 218
 219 struct binder_node {
 220         int debug_id;
 221         struct binder_work work;
 222         union {
 223                 struct rb_node rb_node;
 224                 struct hlist_node dead_node;
 225         };
 226         struct binder_proc *proc;
 227         struct hlist_head refs;
 228         int internal_strong_refs;
 229         int local_weak_refs;
 230         int local_strong_refs;
 231         void __user *ptr;
 232         void __user *cookie;
 233         unsigned has_strong_ref:1;
 234         unsigned pending_strong_ref:1;
 235         unsigned has_weak_ref:1;
 236         unsigned pending_weak_ref:1;
 237         unsigned has_async_transaction:1;
 238         unsigned accept_fds:1;
 239         unsigned min_priority:8;
 240         struct list_head async_todo;
 241 };
 242
 243 struct binder_ref_death {
 244         struct binder_work work;
 245         void __user *cookie;
 246 };
 247
 248 struct binder_ref {
 249         /* Lookups needed: */
 250         /*   node + proc => ref (transaction) */
 251         /*   desc + proc => ref (transaction, inc/dec ref) */
 252         /*   node => refs + procs (proc exit) */
 253         int debug_id;
 254         struct rb_node rb_node_desc;
 255         struct rb_node rb_node_node;
 256         struct hlist_node node_entry;
 257         struct binder_proc *proc;
 258         struct binder_node *node;
 259         uint32_t desc;
 260         int strong;
 261         int weak;
 262         struct binder_ref_death *death;
 263 };
 264
 265 struct binder_buffer {
 266         struct list_head entry; /* free and allocated entries by address */
 267         struct rb_node rb_node; /* free entry by size or allocated entry */
 268                                 /* by address */
 269         unsigned free:1;
 270         unsigned allow_user_free:1;
 271         unsigned async_transaction:1;
 272         unsigned debug_id:29;
 273
 274         struct binder_transaction *transaction;
 275
 276         struct binder_node *target_node;
 277         size_t data_size;
 278         size_t offsets_size;
 279         uint8_t data[0];
 280 };
 281
 282 enum binder_deferred_state {
 283         BINDER_DEFERRED_PUT_FILES    = 0x01,
 284         BINDER_DEFERRED_FLUSH        = 0x02,
 285         BINDER_DEFERRED_RELEASE      = 0x04,
 286 };
 287
 288 struct binder_proc {
 289         struct hlist_node proc_node;
 290         struct rb_root threads;
 291         struct rb_root nodes;
 292         struct rb_root refs_by_desc;
 293         struct rb_root refs_by_node;
 294         int pid;
 295         struct vm_area_struct *vma;
 296         struct mm_struct *vma_vm_mm;
 297         struct task_struct *tsk;
 298         struct files_struct *files;
 299         struct hlist_node deferred_work_node;
 300         int deferred_work;
 301         void *buffer;
 302         ptrdiff_t user_buffer_offset;
 303
 304         struct list_head buffers;
 305         struct rb_root free_buffers;
 306         struct rb_root allocated_buffers;
 307         size_t free_async_space;
 308
 309         struct page **pages;
 310         size_t buffer_size;
 311         uint32_t buffer_free;
 312         struct list_head todo;
 313         wait_queue_head_t wait;
 314         struct binder_stats stats;
 315         struct list_head delivered_death;
 316         int max_threads;
 317         int requested_threads;
 318         int requested_threads_started;
 319         int ready_threads;
 320         long default_priority;
 321         struct dentry *debugfs_entry;
 322 };
 323
 324 enum {
 325         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 326         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 327         BINDER_LOOPER_STATE_EXITED      = 0x04,
 328         BINDER_LOOPER_STATE_INVALID     = 0x08,
 329         BINDER_LOOPER_STATE_WAITING     = 0x10,
 330         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 331 };
 332
 333 struct binder_thread {
 334         struct binder_proc *proc;
 335         struct rb_node rb_node;
 336         int pid;
 337         int looper;
 338         struct binder_transaction *transaction_stack;
 339         struct list_head todo;
 340         uint32_t return_error; /* Write failed, return error code in read buf */
 341         uint32_t return_error2; /* Write failed, return error code in read */
 342                 /* buffer. Used when sending a reply to a dead process that */
 343                 /* we are also waiting on */
 344         wait_queue_head_t wait;
 345         struct binder_stats stats;
 346 };
 347
 348 struct binder_transaction {
 349         int debug_id;
 350         struct binder_work work;
 351         struct binder_thread *from;
 352         struct binder_transaction *from_parent;
 353         struct binder_proc *to_proc;
 354         struct binder_thread *to_thread;
 355         struct binder_transaction *to_parent;
 356         unsigned need_reply:1;
 357         /* unsigned is_dead:1; */       /* not used at the moment */
 358
 359         struct binder_buffer *buffer;
 360         unsigned int    code;
 361         unsigned int    flags;
 362         long    priority;
 363         long    saved_priority;
 364         kuid_t  sender_euid;
 365 };
 366
 367 static void
 368 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 369
 370 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 371 {
 372         struct files_struct *files = proc->files;
 373         unsigned long rlim_cur;
 374         unsigned long irqs;
 375
 376         if (files == NULL)
 377                 return -ESRCH;
 378
 379         if (!lock_task_sighand(proc->tsk, &irqs))
 380                 return -EMFILE;
 381
 382         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 383         unlock_task_sighand(proc->tsk, &irqs);
 384
 385         return __alloc_fd(files, 0, rlim_cur, flags);
 386 }
 387
 388 /*
 389  * copied from fd_install
 390  */
 391 static void task_fd_install(
 392         struct binder_proc *proc, unsigned int fd, struct file *file)
 393 {
 394         if (proc->files)
 395                 __fd_install(proc->files, fd, file);
 396 }
 397
 398 /*
 399  * copied from sys_close
 400  */
 401 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 402 {
 403         int retval;
 404
 405         if (proc->files == NULL)
 406                 return -ESRCH;
 407
 408         retval = __close_fd(proc->files, fd);
 409         /* can't restart close syscall because file table entry was cleared */
 410         if (unlikely(retval == -ERESTARTSYS ||
 411                      retval == -ERESTARTNOINTR ||
 412                      retval == -ERESTARTNOHAND ||
 413                      retval == -ERESTART_RESTARTBLOCK))
 414                 retval = -EINTR;
 415
 416         return retval;
 417 }
 418
 419 static inline void binder_lock(const char *tag)
 420 {
 421         trace_binder_lock(tag);
 422         mutex_lock(&binder_main_lock);
 423         trace_binder_locked(tag);
 424 }
 425
 426 static inline void binder_unlock(const char *tag)
 427 {
 428         trace_binder_unlock(tag);
 429         mutex_unlock(&binder_main_lock);
 430 }
 431
 432 static void binder_set_nice(long nice)
 433 {
 434         long min_nice;
 435         if (can_nice(current, nice)) {
 436                 set_user_nice(current, nice);
 437                 return;
 438         }
 439         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 440         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 441                      "%d: nice value %ld not allowed use %ld instead\n",
 442                       current->pid, nice, min_nice);
 443         set_user_nice(current, min_nice);
 444         if (min_nice < 20)
 445                 return;
 446         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 447 }
 448
 449 static size_t binder_buffer_size(struct binder_proc *proc,
 450                                  struct binder_buffer *buffer)
 451 {
 452         if (list_is_last(&buffer->entry, &proc->buffers))
 453                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 454         else
 455                 return (size_t)list_entry(buffer->entry.next,
 456                         struct binder_buffer, entry) - (size_t)buffer->data;
 457 }
 458
 459 static void binder_insert_free_buffer(struct binder_proc *proc,
 460                                       struct binder_buffer *new_buffer)
 461 {
 462         struct rb_node **p = &proc->free_buffers.rb_node;
 463         struct rb_node *parent = NULL;
 464         struct binder_buffer *buffer;
 465         size_t buffer_size;
 466         size_t new_buffer_size;
 467
 468         BUG_ON(!new_buffer->free);
 469
 470         new_buffer_size = binder_buffer_size(proc, new_buffer);
 471
 472         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 473                      "%d: add free buffer, size %zd, at %p\n",
 474                       proc->pid, new_buffer_size, new_buffer);
 475
 476         while (*p) {
 477                 parent = *p;
 478                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 479                 BUG_ON(!buffer->free);
 480
 481                 buffer_size = binder_buffer_size(proc, buffer);
 482
 483                 if (new_buffer_size < buffer_size)
 484                         p = &parent->rb_left;
 485                 else
 486                         p = &parent->rb_right;
 487         }
 488         rb_link_node(&new_buffer->rb_node, parent, p);
 489         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 490 }
 491
 492 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 493                                            struct binder_buffer *new_buffer)
 494 {
 495         struct rb_node **p = &proc->allocated_buffers.rb_node;
 496         struct rb_node *parent = NULL;
 497         struct binder_buffer *buffer;
 498
 499         BUG_ON(new_buffer->free);
 500
 501         while (*p) {
 502                 parent = *p;
 503                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 504                 BUG_ON(buffer->free);
 505
 506                 if (new_buffer < buffer)
 507                         p = &parent->rb_left;
 508                 else if (new_buffer > buffer)
 509                         p = &parent->rb_right;
 510                 else
 511                         BUG();
 512         }
 513         rb_link_node(&new_buffer->rb_node, parent, p);
 514         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 515 }
 516
 517 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 518                                                   void __user *user_ptr)
 519 {
 520         struct rb_node *n = proc->allocated_buffers.rb_node;
 521         struct binder_buffer *buffer;
 522         struct binder_buffer *kern_ptr;
 523
 524         kern_ptr = user_ptr - proc->user_buffer_offset
 525                 - offsetof(struct binder_buffer, data);
 526
 527         while (n) {
 528                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 529                 BUG_ON(buffer->free);
 530
 531                 if (kern_ptr < buffer)
 532                         n = n->rb_left;
 533                 else if (kern_ptr > buffer)
 534                         n = n->rb_right;
 535                 else
 536                         return buffer;
 537         }
 538         return NULL;
 539 }
 540
 541 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 542                                     void *start, void *end,
 543                                     struct vm_area_struct *vma)
 544 {
 545         void *page_addr;
 546         unsigned long user_page_addr;
 547         struct vm_struct tmp_area;
 548         struct page **page;
 549         struct mm_struct *mm;
 550
 551         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 552                      "%d: %s pages %p-%p\n", proc->pid,
 553                      allocate ? "allocate" : "free", start, end);
 554
 555         if (end <= start)
 556                 return 0;
 557
 558         trace_binder_update_page_range(proc, allocate, start, end);
 559
 560         if (vma)
 561                 mm = NULL;
 562         else
 563                 mm = get_task_mm(proc->tsk);
 564
 565         if (mm) {
 566                 down_write(&mm->mmap_sem);
 567                 vma = proc->vma;
 568                 if (vma && mm != proc->vma_vm_mm) {
 569                         pr_err("%d: vma mm and task mm mismatch\n",
 570                                 proc->pid);
 571                         vma = NULL;
 572                 }
 573         }
 574
 575         if (allocate == 0)
 576                 goto free_range;
 577
 578         if (vma == NULL) {
 579                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 580                         proc->pid);
 581                 goto err_no_vma;
 582         }
 583
 584         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 585                 int ret;
 586                 struct page **page_array_ptr;
 587                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 588
 589                 BUG_ON(*page);
 590                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 591                 if (*page == NULL) {
 592                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 593                                 proc->pid, page_addr);
 594                         goto err_alloc_page_failed;
 595                 }
 596                 tmp_area.addr = page_addr;
 597                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 598                 page_array_ptr = page;
 599                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 600                 if (ret) {
 601                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 602                                proc->pid, page_addr);
 603                         goto err_map_kernel_failed;
 604                 }
 605                 user_page_addr =
 606                         (uintptr_t)page_addr + proc->user_buffer_offset;
 607                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 608                 if (ret) {
 609                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 610                                proc->pid, user_page_addr);
 611                         goto err_vm_insert_page_failed;
 612                 }
 613                 /* vm_insert_page does not seem to increment the refcount */
 614         }
 615         if (mm) {
 616                 up_write(&mm->mmap_sem);
 617                 mmput(mm);
 618         }
 619         return 0;
 620
 621 free_range:
 622         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 623              page_addr -= PAGE_SIZE) {
 624                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 625                 if (vma)
 626                         zap_page_range(vma, (uintptr_t)page_addr +
 627                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 628 err_vm_insert_page_failed:
 629                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 630 err_map_kernel_failed:
 631                 __free_page(*page);
 632                 *page = NULL;
 633 err_alloc_page_failed:
 634                 ;
 635         }
 636 err_no_vma:
 637         if (mm) {
 638                 up_write(&mm->mmap_sem);
 639                 mmput(mm);
 640         }
 641         return -ENOMEM;
 642 }
 643
 644 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 645                                               size_t data_size,
 646                                               size_t offsets_size, int is_async)
 647 {
 648         struct rb_node *n = proc->free_buffers.rb_node;
 649         struct binder_buffer *buffer;
 650         size_t buffer_size;
 651         struct rb_node *best_fit = NULL;
 652         void *has_page_addr;
 653         void *end_page_addr;
 654         size_t size;
 655
 656         if (proc->vma == NULL) {
 657                 pr_err("%d: binder_alloc_buf, no vma\n",
 658                        proc->pid);
 659                 return NULL;
 660         }
 661
 662         size = ALIGN(data_size, sizeof(void *)) +
 663                 ALIGN(offsets_size, sizeof(void *));
 664
 665         if (size < data_size || size < offsets_size) {
 666                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 667                                 proc->pid, data_size, offsets_size);
 668                 return NULL;
 669         }
 670
 671         if (is_async &&
 672             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 673                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 674                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 675                               proc->pid, size);
 676                 return NULL;
 677         }
 678
 679         while (n) {
 680                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 681                 BUG_ON(!buffer->free);
 682                 buffer_size = binder_buffer_size(proc, buffer);
 683
 684                 if (size < buffer_size) {
 685                         best_fit = n;
 686                         n = n->rb_left;
 687                 } else if (size > buffer_size)
 688                         n = n->rb_right;
 689                 else {
 690                         best_fit = n;
 691                         break;
 692                 }
 693         }
 694         if (best_fit == NULL) {
 695                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 696                         proc->pid, size);
 697                 return NULL;
 698         }
 699         if (n == NULL) {
 700                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 701                 buffer_size = binder_buffer_size(proc, buffer);
 702         }
 703
 704         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 705                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 706                       proc->pid, size, buffer, buffer_size);
 707
 708         has_page_addr =
 709                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 710         if (n == NULL) {
 711                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 712                         buffer_size = size; /* no room for other buffers */
 713                 else
 714                         buffer_size = size + sizeof(struct binder_buffer);
 715         }
 716         end_page_addr =
 717                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 718         if (end_page_addr > has_page_addr)
 719                 end_page_addr = has_page_addr;
 720         if (binder_update_page_range(proc, 1,
 721             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 722                 return NULL;
 723
 724         rb_erase(best_fit, &proc->free_buffers);
 725         buffer->free = 0;
 726         binder_insert_allocated_buffer(proc, buffer);
 727         if (buffer_size != size) {
 728                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 729                 list_add(&new_buffer->entry, &buffer->entry);
 730                 new_buffer->free = 1;
 731                 binder_insert_free_buffer(proc, new_buffer);
 732         }
 733         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 734                      "%d: binder_alloc_buf size %zd got %p\n",
 735                       proc->pid, size, buffer);
 736         buffer->data_size = data_size;
 737         buffer->offsets_size = offsets_size;
 738         buffer->async_transaction = is_async;
 739         if (is_async) {
 740                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 741                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 742                              "%d: binder_alloc_buf size %zd async free %zd\n",
 743                               proc->pid, size, proc->free_async_space);
 744         }
 745
 746         return buffer;
 747 }
 748
 749 static void *buffer_start_page(struct binder_buffer *buffer)
 750 {
 751         return (void *)((uintptr_t)buffer & PAGE_MASK);
 752 }
 753
 754 static void *buffer_end_page(struct binder_buffer *buffer)
 755 {
 756         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 757 }
 758
 759 static void binder_delete_free_buffer(struct binder_proc *proc,
 760                                       struct binder_buffer *buffer)
 761 {
 762         struct binder_buffer *prev, *next = NULL;
 763         int free_page_end = 1;
 764         int free_page_start = 1;
 765
 766         BUG_ON(proc->buffers.next == &buffer->entry);
 767         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 768         BUG_ON(!prev->free);
 769         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 770                 free_page_start = 0;
 771                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 772                         free_page_end = 0;
 773                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 774                              "%d: merge free, buffer %p share page with %p\n",
 775                               proc->pid, buffer, prev);
 776         }
 777
 778         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 779                 next = list_entry(buffer->entry.next,
 780                                   struct binder_buffer, entry);
 781                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 782                         free_page_end = 0;
 783                         if (buffer_start_page(next) ==
 784                             buffer_start_page(buffer))
 785                                 free_page_start = 0;
 786                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 787                                      "%d: merge free, buffer %p share page with %p\n",
 788                                       proc->pid, buffer, prev);
 789                 }
 790         }
 791         list_del(&buffer->entry);
 792         if (free_page_start || free_page_end) {
 793                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 794                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 795                              proc->pid, buffer, free_page_start ? "" : " end",
 796                              free_page_end ? "" : " start", prev, next);
 797                 binder_update_page_range(proc, 0, free_page_start ?
 798                         buffer_start_page(buffer) : buffer_end_page(buffer),
 799                         (free_page_end ? buffer_end_page(buffer) :
 800                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 801         }
 802 }
 803
 804 static void binder_free_buf(struct binder_proc *proc,
 805                             struct binder_buffer *buffer)
 806 {
 807         size_t size, buffer_size;
 808
 809         buffer_size = binder_buffer_size(proc, buffer);
 810
 811         size = ALIGN(buffer->data_size, sizeof(void *)) +
 812                 ALIGN(buffer->offsets_size, sizeof(void *));
 813
 814         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 815                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 816                       proc->pid, buffer, size, buffer_size);
 817
 818         BUG_ON(buffer->free);
 819         BUG_ON(size > buffer_size);
 820         BUG_ON(buffer->transaction != NULL);
 821         BUG_ON((void *)buffer < proc->buffer);
 822         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 823
 824         if (buffer->async_transaction) {
 825                 proc->free_async_space += size + sizeof(struct binder_buffer);
 826
 827                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 828                              "%d: binder_free_buf size %zd async free %zd\n",
 829                               proc->pid, size, proc->free_async_space);
 830         }
 831
 832         binder_update_page_range(proc, 0,
 833                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 834                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 835                 NULL);
 836         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 837         buffer->free = 1;
 838         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 839                 struct binder_buffer *next = list_entry(buffer->entry.next,
 840                                                 struct binder_buffer, entry);
 841                 if (next->free) {
 842                         rb_erase(&next->rb_node, &proc->free_buffers);
 843                         binder_delete_free_buffer(proc, next);
 844                 }
 845         }
 846         if (proc->buffers.next != &buffer->entry) {
 847                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 848                                                 struct binder_buffer, entry);
 849                 if (prev->free) {
 850                         binder_delete_free_buffer(proc, buffer);
 851                         rb_erase(&prev->rb_node, &proc->free_buffers);
 852                         buffer = prev;
 853                 }
 854         }
 855         binder_insert_free_buffer(proc, buffer);
 856 }
 857
 858 static struct binder_node *binder_get_node(struct binder_proc *proc,
 859                                            void __user *ptr)
 860 {
 861         struct rb_node *n = proc->nodes.rb_node;
 862         struct binder_node *node;
 863
 864         while (n) {
 865                 node = rb_entry(n, struct binder_node, rb_node);
 866
 867                 if (ptr < node->ptr)
 868                         n = n->rb_left;
 869                 else if (ptr > node->ptr)
 870                         n = n->rb_right;
 871                 else
 872                         return node;
 873         }
 874         return NULL;
 875 }
 876
 877 static struct binder_node *binder_new_node(struct binder_proc *proc,
 878                                            void __user *ptr,
 879                                            void __user *cookie)
 880 {
 881         struct rb_node **p = &proc->nodes.rb_node;
 882         struct rb_node *parent = NULL;
 883         struct binder_node *node;
 884
 885         while (*p) {
 886                 parent = *p;
 887                 node = rb_entry(parent, struct binder_node, rb_node);
 888
 889                 if (ptr < node->ptr)
 890                         p = &(*p)->rb_left;
 891                 else if (ptr > node->ptr)
 892                         p = &(*p)->rb_right;
 893                 else
 894                         return NULL;
 895         }
 896
 897         node = kzalloc(sizeof(*node), GFP_KERNEL);
 898         if (node == NULL)
 899                 return NULL;
 900         binder_stats_created(BINDER_STAT_NODE);
 901         rb_link_node(&node->rb_node, parent, p);
 902         rb_insert_color(&node->rb_node, &proc->nodes);
 903         node->debug_id = ++binder_last_id;
 904         node->proc = proc;
 905         node->ptr = ptr;
 906         node->cookie = cookie;
 907         node->work.type = BINDER_WORK_NODE;
 908         INIT_LIST_HEAD(&node->work.entry);
 909         INIT_LIST_HEAD(&node->async_todo);
 910         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 911                      "%d:%d node %d u%p c%p created\n",
 912                      proc->pid, current->pid, node->debug_id,
 913                      node->ptr, node->cookie);
 914         return node;
 915 }
 916
 917 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 918                            struct list_head *target_list)
 919 {
 920         if (strong) {
 921                 if (internal) {
 922                         if (target_list == NULL &&
 923                             node->internal_strong_refs == 0 &&
 924                             !(node == binder_context_mgr_node &&
 925                             node->has_strong_ref)) {
 926                                 pr_err("invalid inc strong node for %d\n",
 927                                         node->debug_id);
 928                                 return -EINVAL;
 929                         }
 930                         node->internal_strong_refs++;
 931                 } else
 932                         node->local_strong_refs++;
 933                 if (!node->has_strong_ref && target_list) {
 934                         list_del_init(&node->work.entry);
 935                         list_add_tail(&node->work.entry, target_list);
 936                 }
 937         } else {
 938                 if (!internal)
 939                         node->local_weak_refs++;
 940                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 941                         if (target_list == NULL) {
 942                                 pr_err("invalid inc weak node for %d\n",
 943                                         node->debug_id);
 944                                 return -EINVAL;
 945                         }
 946                         list_add_tail(&node->work.entry, target_list);
 947                 }
 948         }
 949         return 0;
 950 }
 951
 952 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 953 {
 954         if (strong) {
 955                 if (internal)
 956                         node->internal_strong_refs--;
 957                 else
 958                         node->local_strong_refs--;
 959                 if (node->local_strong_refs || node->internal_strong_refs)
 960                         return 0;
 961         } else {
 962                 if (!internal)
 963                         node->local_weak_refs--;
 964                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 965                         return 0;
 966         }
 967         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 968                 if (list_empty(&node->work.entry)) {
 969                         list_add_tail(&node->work.entry, &node->proc->todo);
 970                         wake_up_interruptible(&node->proc->wait);
 971                 }
 972         } else {
 973                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 974                     !node->local_weak_refs) {
 975                         list_del_init(&node->work.entry);
 976                         if (node->proc) {
 977                                 rb_erase(&node->rb_node, &node->proc->nodes);
 978                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 979                                              "refless node %d deleted\n",
 980                                              node->debug_id);
 981                         } else {
 982                                 hlist_del(&node->dead_node);
 983                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 984                                              "dead node %d deleted\n",
 985                                              node->debug_id);
 986                         }
 987                         kfree(node);
 988                         binder_stats_deleted(BINDER_STAT_NODE);
 989                 }
 990         }
 991
 992         return 0;
 993 }
 994
 995
 996 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
 997                                          uint32_t desc)
 998 {
 999         struct rb_node *n = proc->refs_by_desc.rb_node;
1000         struct binder_ref *ref;
1001
1002         while (n) {
1003                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1004
1005                 if (desc < ref->desc)
1006                         n = n->rb_left;
1007                 else if (desc > ref->desc)
1008                         n = n->rb_right;
1009                 else
1010                         return ref;
1011         }
1012         return NULL;
1013 }
1014
1015 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1016                                                   struct binder_node *node)
1017 {
1018         struct rb_node *n;
1019         struct rb_node **p = &proc->refs_by_node.rb_node;
1020         struct rb_node *parent = NULL;
1021         struct binder_ref *ref, *new_ref;
1022
1023         while (*p) {
1024                 parent = *p;
1025                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1026
1027                 if (node < ref->node)
1028                         p = &(*p)->rb_left;
1029                 else if (node > ref->node)
1030                         p = &(*p)->rb_right;
1031                 else
1032                         return ref;
1033         }
1034         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1035         if (new_ref == NULL)
1036                 return NULL;
1037         binder_stats_created(BINDER_STAT_REF);
1038         new_ref->debug_id = ++binder_last_id;
1039         new_ref->proc = proc;
1040         new_ref->node = node;
1041         rb_link_node(&new_ref->rb_node_node, parent, p);
1042         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1043
1044         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1045         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1046                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1047                 if (ref->desc > new_ref->desc)
1048                         break;
1049                 new_ref->desc = ref->desc + 1;
1050         }
1051
1052         p = &proc->refs_by_desc.rb_node;
1053         while (*p) {
1054                 parent = *p;
1055                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1056
1057                 if (new_ref->desc < ref->desc)
1058                         p = &(*p)->rb_left;
1059                 else if (new_ref->desc > ref->desc)
1060                         p = &(*p)->rb_right;
1061                 else
1062                         BUG();
1063         }
1064         rb_link_node(&new_ref->rb_node_desc, parent, p);
1065         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1066         if (node) {
1067                 hlist_add_head(&new_ref->node_entry, &node->refs);
1068
1069                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1070                              "%d new ref %d desc %d for node %d\n",
1071                               proc->pid, new_ref->debug_id, new_ref->desc,
1072                               node->debug_id);
1073         } else {
1074                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1075                              "%d new ref %d desc %d for dead node\n",
1076                               proc->pid, new_ref->debug_id, new_ref->desc);
1077         }
1078         return new_ref;
1079 }
1080
1081 static void binder_delete_ref(struct binder_ref *ref)
1082 {
1083         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1084                      "%d delete ref %d desc %d for node %d\n",
1085                       ref->proc->pid, ref->debug_id, ref->desc,
1086                       ref->node->debug_id);
1087
1088         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1089         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1090         if (ref->strong)
1091                 binder_dec_node(ref->node, 1, 1);
1092         hlist_del(&ref->node_entry);
1093         binder_dec_node(ref->node, 0, 1);
1094         if (ref->death) {
1095                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1096                              "%d delete ref %d desc %d has death notification\n",
1097                               ref->proc->pid, ref->debug_id, ref->desc);
1098                 list_del(&ref->death->work.entry);
1099                 kfree(ref->death);
1100                 binder_stats_deleted(BINDER_STAT_DEATH);
1101         }
1102         kfree(ref);
1103         binder_stats_deleted(BINDER_STAT_REF);
1104 }
1105
1106 static int binder_inc_ref(struct binder_ref *ref, int strong,
1107                           struct list_head *target_list)
1108 {
1109         int ret;
1110         if (strong) {
1111                 if (ref->strong == 0) {
1112                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1113                         if (ret)
1114                                 return ret;
1115                 }
1116                 ref->strong++;
1117         } else {
1118                 if (ref->weak == 0) {
1119                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1120                         if (ret)
1121                                 return ret;
1122                 }
1123                 ref->weak++;
1124         }
1125         return 0;
1126 }
1127
1128
1129 static int binder_dec_ref(struct binder_ref *ref, int strong)
1130 {
1131         if (strong) {
1132                 if (ref->strong == 0) {
1133                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1134                                           ref->proc->pid, ref->debug_id,
1135                                           ref->desc, ref->strong, ref->weak);
1136                         return -EINVAL;
1137                 }
1138                 ref->strong--;
1139                 if (ref->strong == 0) {
1140                         int ret;
1141                         ret = binder_dec_node(ref->node, strong, 1);
1142                         if (ret)
1143                                 return ret;
1144                 }
1145         } else {
1146                 if (ref->weak == 0) {
1147                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1148                                           ref->proc->pid, ref->debug_id,
1149                                           ref->desc, ref->strong, ref->weak);
1150                         return -EINVAL;
1151                 }
1152                 ref->weak--;
1153         }
1154         if (ref->strong == 0 && ref->weak == 0)
1155                 binder_delete_ref(ref);
1156         return 0;
1157 }
1158
1159 static void binder_pop_transaction(struct binder_thread *target_thread,
1160                                    struct binder_transaction *t)
1161 {
1162         if (target_thread) {
1163                 BUG_ON(target_thread->transaction_stack != t);
1164                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1165                 target_thread->transaction_stack =
1166                         target_thread->transaction_stack->from_parent;
1167                 t->from = NULL;
1168         }
1169         t->need_reply = 0;
1170         if (t->buffer)
1171                 t->buffer->transaction = NULL;
1172         kfree(t);
1173         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1174 }
1175
1176 static void binder_send_failed_reply(struct binder_transaction *t,
1177                                      uint32_t error_code)
1178 {
1179         struct binder_thread *target_thread;
1180         BUG_ON(t->flags & TF_ONE_WAY);
1181         while (1) {
1182                 target_thread = t->from;
1183                 if (target_thread) {
1184                         if (target_thread->return_error != BR_OK &&
1185                            target_thread->return_error2 == BR_OK) {
1186                                 target_thread->return_error2 =
1187                                         target_thread->return_error;
1188                                 target_thread->return_error = BR_OK;
1189                         }
1190                         if (target_thread->return_error == BR_OK) {
1191                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1192                                              "send failed reply for transaction %d to %d:%d\n",
1193                                               t->debug_id, target_thread->proc->pid,
1194                                               target_thread->pid);
1195
1196                                 binder_pop_transaction(target_thread, t);
1197                                 target_thread->return_error = error_code;
1198                                 wake_up_interruptible(&target_thread->wait);
1199                         } else {
1200                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1201                                         target_thread->proc->pid,
1202                                         target_thread->pid,
1203                                         target_thread->return_error);
1204                         }
1205                         return;
1206                 } else {
1207                         struct binder_transaction *next = t->from_parent;
1208
1209                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1210                                      "send failed reply for transaction %d, target dead\n",
1211                                      t->debug_id);
1212
1213                         binder_pop_transaction(target_thread, t);
1214                         if (next == NULL) {
1215                                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1216                                              "reply failed, no target thread at root\n");
1217                                 return;
1218                         }
1219                         t = next;
1220                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1221                                      "reply failed, no target thread -- retry %d\n",
1222                                       t->debug_id);
1223                 }
1224         }
1225 }
1226
1227 static void binder_transaction_buffer_release(struct binder_proc *proc,
1228                                               struct binder_buffer *buffer,
1229                                               size_t *failed_at)
1230 {
1231         size_t *offp, *off_end;
1232         int debug_id = buffer->debug_id;
1233
1234         binder_debug(BINDER_DEBUG_TRANSACTION,
1235                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1236                      proc->pid, buffer->debug_id,
1237                      buffer->data_size, buffer->offsets_size, failed_at);
1238
1239         if (buffer->target_node)
1240                 binder_dec_node(buffer->target_node, 1, 0);
1241
1242         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1243         if (failed_at)
1244                 off_end = failed_at;
1245         else
1246                 off_end = (void *)offp + buffer->offsets_size;
1247         for (; offp < off_end; offp++) {
1248                 struct flat_binder_object *fp;
1249                 if (*offp > buffer->data_size - sizeof(*fp) ||
1250                     buffer->data_size < sizeof(*fp) ||
1251                     !IS_ALIGNED(*offp, sizeof(u32))) {
1252                         pr_err("transaction release %d bad offset %zd, size %zd\n",
1253                          debug_id, *offp, buffer->data_size);
1254                         continue;
1255                 }
1256                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1257                 switch (fp->type) {
1258                 case BINDER_TYPE_BINDER:
1259                 case BINDER_TYPE_WEAK_BINDER: {
1260                         struct binder_node *node = binder_get_node(proc, fp->binder);
1261                         if (node == NULL) {
1262                                 pr_err("transaction release %d bad node %p\n",
1263                                         debug_id, fp->binder);
1264                                 break;
1265                         }
1266                         binder_debug(BINDER_DEBUG_TRANSACTION,
1267                                      "        node %d u%p\n",
1268                                      node->debug_id, node->ptr);
1269                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1270                 } break;
1271                 case BINDER_TYPE_HANDLE:
1272                 case BINDER_TYPE_WEAK_HANDLE: {
1273                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1274                         if (ref == NULL) {
1275                                 pr_err("transaction release %d bad handle %d\n",
1276                                  debug_id, fp->handle);
1277                                 break;
1278                         }
1279                         binder_debug(BINDER_DEBUG_TRANSACTION,
1280                                      "        ref %d desc %d (node %d)\n",
1281                                      ref->debug_id, ref->desc, ref->node->debug_id);
1282                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1283                 } break;
1284
1285                 case BINDER_TYPE_FD:
1286                         binder_debug(BINDER_DEBUG_TRANSACTION,
1287                                      "        fd %d\n", fp->handle);
1288                         if (failed_at)
1289                                 task_close_fd(proc, fp->handle);
1290                         break;
1291
1292                 default:
1293                         pr_err("transaction release %d bad object type %x\n",
1294                                 debug_id, fp->type);
1295                         break;
1296                 }
1297         }
1298 }
1299
1300 static void binder_transaction(struct binder_proc *proc,
1301                                struct binder_thread *thread,
1302                                struct binder_transaction_data *tr, int reply)
1303 {
1304         struct binder_transaction *t;
1305         struct binder_work *tcomplete;
1306         size_t *offp, *off_end;
1307         struct binder_proc *target_proc;
1308         struct binder_thread *target_thread = NULL;
1309         struct binder_node *target_node = NULL;
1310         struct list_head *target_list;
1311         wait_queue_head_t *target_wait;
1312         struct binder_transaction *in_reply_to = NULL;
1313         struct binder_transaction_log_entry *e;
1314         uint32_t return_error;
1315
1316         e = binder_transaction_log_add(&binder_transaction_log);
1317         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1318         e->from_proc = proc->pid;
1319         e->from_thread = thread->pid;
1320         e->target_handle = tr->target.handle;
1321         e->data_size = tr->data_size;
1322         e->offsets_size = tr->offsets_size;
1323
1324         if (reply) {
1325                 in_reply_to = thread->transaction_stack;
1326                 if (in_reply_to == NULL) {
1327                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1328                                           proc->pid, thread->pid);
1329                         return_error = BR_FAILED_REPLY;
1330                         goto err_empty_call_stack;
1331                 }
1332                 binder_set_nice(in_reply_to->saved_priority);
1333                 if (in_reply_to->to_thread != thread) {
1334                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1335                                 proc->pid, thread->pid, in_reply_to->debug_id,
1336                                 in_reply_to->to_proc ?
1337                                 in_reply_to->to_proc->pid : 0,
1338                                 in_reply_to->to_thread ?
1339                                 in_reply_to->to_thread->pid : 0);
1340                         return_error = BR_FAILED_REPLY;
1341                         in_reply_to = NULL;
1342                         goto err_bad_call_stack;
1343                 }
1344                 thread->transaction_stack = in_reply_to->to_parent;
1345                 target_thread = in_reply_to->from;
1346                 if (target_thread == NULL) {
1347                         return_error = BR_DEAD_REPLY;
1348                         goto err_dead_binder;
1349                 }
1350                 if (target_thread->transaction_stack != in_reply_to) {
1351                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1352                                 proc->pid, thread->pid,
1353                                 target_thread->transaction_stack ?
1354                                 target_thread->transaction_stack->debug_id : 0,
1355                                 in_reply_to->debug_id);
1356                         return_error = BR_FAILED_REPLY;
1357                         in_reply_to = NULL;
1358                         target_thread = NULL;
1359                         goto err_dead_binder;
1360                 }
1361                 target_proc = target_thread->proc;
1362         } else {
1363                 if (tr->target.handle) {
1364                         struct binder_ref *ref;
1365                         ref = binder_get_ref(proc, tr->target.handle);
1366                         if (ref == NULL) {
1367                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1368                                         proc->pid, thread->pid);
1369                                 return_error = BR_FAILED_REPLY;
1370                                 goto err_invalid_target_handle;
1371                         }
1372                         target_node = ref->node;
1373                 } else {
1374                         target_node = binder_context_mgr_node;
1375                         if (target_node == NULL) {
1376                                 return_error = BR_DEAD_REPLY;
1377                                 goto err_no_context_mgr_node;
1378                         }
1379                 }
1380                 e->to_node = target_node->debug_id;
1381                 target_proc = target_node->proc;
1382                 if (target_proc == NULL) {
1383                         return_error = BR_DEAD_REPLY;
1384                         goto err_dead_binder;
1385                 }
1386                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1387                         struct binder_transaction *tmp;
1388                         tmp = thread->transaction_stack;
1389                         if (tmp->to_thread != thread) {
1390                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1391                                         proc->pid, thread->pid, tmp->debug_id,
1392                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1393                                         tmp->to_thread ?
1394                                         tmp->to_thread->pid : 0);
1395                                 return_error = BR_FAILED_REPLY;
1396                                 goto err_bad_call_stack;
1397                         }
1398                         while (tmp) {
1399                                 if (tmp->from && tmp->from->proc == target_proc)
1400                                         target_thread = tmp->from;
1401                                 tmp = tmp->from_parent;
1402                         }
1403                 }
1404         }
1405         if (target_thread) {
1406                 e->to_thread = target_thread->pid;
1407                 target_list = &target_thread->todo;
1408                 target_wait = &target_thread->wait;
1409         } else {
1410                 target_list = &target_proc->todo;
1411                 target_wait = &target_proc->wait;
1412         }
1413         e->to_proc = target_proc->pid;
1414
1415         /* TODO: reuse incoming transaction for reply */
1416         t = kzalloc(sizeof(*t), GFP_KERNEL);
1417         if (t == NULL) {
1418                 return_error = BR_FAILED_REPLY;
1419                 goto err_alloc_t_failed;
1420         }
1421         binder_stats_created(BINDER_STAT_TRANSACTION);
1422
1423         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1424         if (tcomplete == NULL) {
1425                 return_error = BR_FAILED_REPLY;
1426                 goto err_alloc_tcomplete_failed;
1427         }
1428         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1429
1430         t->debug_id = ++binder_last_id;
1431         e->debug_id = t->debug_id;
1432
1433         if (reply)
1434                 binder_debug(BINDER_DEBUG_TRANSACTION,
1435                              "%d:%d BC_REPLY %d -> %d:%d, data %p-%p size %zd-%zd\n",
1436                              proc->pid, thread->pid, t->debug_id,
1437                              target_proc->pid, target_thread->pid,
1438                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1439                              tr->data_size, tr->offsets_size);
1440         else
1441                 binder_debug(BINDER_DEBUG_TRANSACTION,
1442                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %p-%p size %zd-%zd\n",
1443                              proc->pid, thread->pid, t->debug_id,
1444                              target_proc->pid, target_node->debug_id,
1445                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1446                              tr->data_size, tr->offsets_size);
1447
1448         if (!reply && !(tr->flags & TF_ONE_WAY))
1449                 t->from = thread;
1450         else
1451                 t->from = NULL;
1452         t->sender_euid = proc->tsk->cred->euid;
1453         t->to_proc = target_proc;
1454         t->to_thread = target_thread;
1455         t->code = tr->code;
1456         t->flags = tr->flags;
1457         t->priority = task_nice(current);
1458
1459         trace_binder_transaction(reply, t, target_node);
1460
1461         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1462                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1463         if (t->buffer == NULL) {
1464                 return_error = BR_FAILED_REPLY;
1465                 goto err_binder_alloc_buf_failed;
1466         }
1467         t->buffer->allow_user_free = 0;
1468         t->buffer->debug_id = t->debug_id;
1469         t->buffer->transaction = t;
1470         t->buffer->target_node = target_node;
1471         trace_binder_transaction_alloc_buf(t->buffer);
1472         if (target_node)
1473                 binder_inc_node(target_node, 1, 0, NULL);
1474
1475         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1476
1477         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1478                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1479                                 proc->pid, thread->pid);
1480                 return_error = BR_FAILED_REPLY;
1481                 goto err_copy_data_failed;
1482         }
1483         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1484                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1485                                 proc->pid, thread->pid);
1486                 return_error = BR_FAILED_REPLY;
1487                 goto err_copy_data_failed;
1488         }
1489         if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1490                 binder_user_error("%d:%d got transaction with invalid offsets size, %zd\n",
1491                                 proc->pid, thread->pid, tr->offsets_size);
1492                 return_error = BR_FAILED_REPLY;
1493                 goto err_bad_offset;
1494         }
1495         off_end = (void *)offp + tr->offsets_size;
1496         for (; offp < off_end; offp++) {
1497                 struct flat_binder_object *fp;
1498                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1499                     t->buffer->data_size < sizeof(*fp) ||
1500                     !IS_ALIGNED(*offp, sizeof(u32))) {
1501                         binder_user_error("%d:%d got transaction with invalid offset, %zd\n",
1502                                         proc->pid, thread->pid, *offp);
1503                         return_error = BR_FAILED_REPLY;
1504                         goto err_bad_offset;
1505                 }
1506                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1507                 switch (fp->type) {
1508                 case BINDER_TYPE_BINDER:
1509                 case BINDER_TYPE_WEAK_BINDER: {
1510                         struct binder_ref *ref;
1511                         struct binder_node *node = binder_get_node(proc, fp->binder);
1512                         if (node == NULL) {
1513                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1514                                 if (node == NULL) {
1515                                         return_error = BR_FAILED_REPLY;
1516                                         goto err_binder_new_node_failed;
1517                                 }
1518                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1519                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1520                         }
1521                         if (fp->cookie != node->cookie) {
1522                                 binder_user_error("%d:%d sending u%p node %d, cookie mismatch %p != %p\n",
1523                                         proc->pid, thread->pid,
1524                                         fp->binder, node->debug_id,
1525                                         fp->cookie, node->cookie);
1526                                 goto err_binder_get_ref_for_node_failed;
1527                         }
1528                         ref = binder_get_ref_for_node(target_proc, node);
1529                         if (ref == NULL) {
1530                                 return_error = BR_FAILED_REPLY;
1531                                 goto err_binder_get_ref_for_node_failed;
1532                         }
1533                         if (fp->type == BINDER_TYPE_BINDER)
1534                                 fp->type = BINDER_TYPE_HANDLE;
1535                         else
1536                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1537                         fp->handle = ref->desc;
1538                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1539                                        &thread->todo);
1540
1541                         trace_binder_transaction_node_to_ref(t, node, ref);
1542                         binder_debug(BINDER_DEBUG_TRANSACTION,
1543                                      "        node %d u%p -> ref %d desc %d\n",
1544                                      node->debug_id, node->ptr, ref->debug_id,
1545                                      ref->desc);
1546                 } break;
1547                 case BINDER_TYPE_HANDLE:
1548                 case BINDER_TYPE_WEAK_HANDLE: {
1549                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1550                         if (ref == NULL) {
1551                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1552                                                 proc->pid,
1553                                                 thread->pid, fp->handle);
1554                                 return_error = BR_FAILED_REPLY;
1555                                 goto err_binder_get_ref_failed;
1556                         }
1557                         if (ref->node->proc == target_proc) {
1558                                 if (fp->type == BINDER_TYPE_HANDLE)
1559                                         fp->type = BINDER_TYPE_BINDER;
1560                                 else
1561                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1562                                 fp->binder = ref->node->ptr;
1563                                 fp->cookie = ref->node->cookie;
1564                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1565                                 trace_binder_transaction_ref_to_node(t, ref);
1566                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1567                                              "        ref %d desc %d -> node %d u%p\n",
1568                                              ref->debug_id, ref->desc, ref->node->debug_id,
1569                                              ref->node->ptr);
1570                         } else {
1571                                 struct binder_ref *new_ref;
1572                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1573                                 if (new_ref == NULL) {
1574                                         return_error = BR_FAILED_REPLY;
1575                                         goto err_binder_get_ref_for_node_failed;
1576                                 }
1577                                 fp->handle = new_ref->desc;
1578                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1579                                 trace_binder_transaction_ref_to_ref(t, ref,
1580                                                                     new_ref);
1581                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1582                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1583                                              ref->debug_id, ref->desc, new_ref->debug_id,
1584                                              new_ref->desc, ref->node->debug_id);
1585                         }
1586                 } break;
1587
1588                 case BINDER_TYPE_FD: {
1589                         int target_fd;
1590                         struct file *file;
1591
1592                         if (reply) {
1593                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1594                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1595                                                 proc->pid, thread->pid, fp->handle);
1596                                         return_error = BR_FAILED_REPLY;
1597                                         goto err_fd_not_allowed;
1598                                 }
1599                         } else if (!target_node->accept_fds) {
1600                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1601                                         proc->pid, thread->pid, fp->handle);
1602                                 return_error = BR_FAILED_REPLY;
1603                                 goto err_fd_not_allowed;
1604                         }
1605
1606                         file = fget(fp->handle);
1607                         if (file == NULL) {
1608                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1609                                         proc->pid, thread->pid, fp->handle);
1610                                 return_error = BR_FAILED_REPLY;
1611                                 goto err_fget_failed;
1612                         }
1613                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1614                         if (target_fd < 0) {
1615                                 fput(file);
1616                                 return_error = BR_FAILED_REPLY;
1617                                 goto err_get_unused_fd_failed;
1618                         }
1619                         task_fd_install(target_proc, target_fd, file);
1620                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1621                         binder_debug(BINDER_DEBUG_TRANSACTION,
1622                                      "        fd %d -> %d\n", fp->handle, target_fd);
1623                         /* TODO: fput? */
1624                         fp->handle = target_fd;
1625                 } break;
1626
1627                 default:
1628                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1629                                 proc->pid, thread->pid, fp->type);
1630                         return_error = BR_FAILED_REPLY;
1631                         goto err_bad_object_type;
1632                 }
1633         }
1634         if (reply) {
1635                 BUG_ON(t->buffer->async_transaction != 0);
1636                 binder_pop_transaction(target_thread, in_reply_to);
1637         } else if (!(t->flags & TF_ONE_WAY)) {
1638                 BUG_ON(t->buffer->async_transaction != 0);
1639                 t->need_reply = 1;
1640                 t->from_parent = thread->transaction_stack;
1641                 thread->transaction_stack = t;
1642         } else {
1643                 BUG_ON(target_node == NULL);
1644                 BUG_ON(t->buffer->async_transaction != 1);
1645                 if (target_node->has_async_transaction) {
1646                         target_list = &target_node->async_todo;
1647                         target_wait = NULL;
1648                 } else
1649                         target_node->has_async_transaction = 1;
1650         }
1651         t->work.type = BINDER_WORK_TRANSACTION;
1652         list_add_tail(&t->work.entry, target_list);
1653         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1654         list_add_tail(&tcomplete->entry, &thread->todo);
1655         if (target_wait)
1656                 wake_up_interruptible(target_wait);
1657         return;
1658
1659 err_get_unused_fd_failed:
1660 err_fget_failed:
1661 err_fd_not_allowed:
1662 err_binder_get_ref_for_node_failed:
1663 err_binder_get_ref_failed:
1664 err_binder_new_node_failed:
1665 err_bad_object_type:
1666 err_bad_offset:
1667 err_copy_data_failed:
1668         trace_binder_transaction_failed_buffer_release(t->buffer);
1669         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1670         t->buffer->transaction = NULL;
1671         binder_free_buf(target_proc, t->buffer);
1672 err_binder_alloc_buf_failed:
1673         kfree(tcomplete);
1674         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1675 err_alloc_tcomplete_failed:
1676         kfree(t);
1677         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1678 err_alloc_t_failed:
1679 err_bad_call_stack:
1680 err_empty_call_stack:
1681 err_dead_binder:
1682 err_invalid_target_handle:
1683 err_no_context_mgr_node:
1684         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1685                      "%d:%d transaction failed %d, size %zd-%zd\n",
1686                      proc->pid, thread->pid, return_error,
1687                      tr->data_size, tr->offsets_size);
1688
1689         {
1690                 struct binder_transaction_log_entry *fe;
1691                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1692                 *fe = *e;
1693         }
1694
1695         BUG_ON(thread->return_error != BR_OK);
1696         if (in_reply_to) {
1697                 thread->return_error = BR_TRANSACTION_COMPLETE;
1698                 binder_send_failed_reply(in_reply_to, return_error);
1699         } else
1700                 thread->return_error = return_error;
1701 }
1702
1703 static int binder_thread_write(struct binder_proc *proc,
1704                         struct binder_thread *thread,
1705                         void __user *buffer, size_t size, size_t *consumed)
1706 {
1707         uint32_t cmd;
1708         void __user *ptr = buffer + *consumed;
1709         void __user *end = buffer + size;
1710
1711         while (ptr < end && thread->return_error == BR_OK) {
1712                 if (get_user(cmd, (uint32_t __user *)ptr))
1713                         return -EFAULT;
1714                 ptr += sizeof(uint32_t);
1715                 trace_binder_command(cmd);
1716                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1717                         binder_stats.bc[_IOC_NR(cmd)]++;
1718                         proc->stats.bc[_IOC_NR(cmd)]++;
1719                         thread->stats.bc[_IOC_NR(cmd)]++;
1720                 }
1721                 switch (cmd) {
1722                 case BC_INCREFS:
1723                 case BC_ACQUIRE:
1724                 case BC_RELEASE:
1725                 case BC_DECREFS: {
1726                         uint32_t target;
1727                         struct binder_ref *ref;
1728                         const char *debug_string;
1729
1730                         if (get_user(target, (uint32_t __user *)ptr))
1731                                 return -EFAULT;
1732                         ptr += sizeof(uint32_t);
1733                         if (target == 0 && binder_context_mgr_node &&
1734                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1735                                 ref = binder_get_ref_for_node(proc,
1736                                                binder_context_mgr_node);
1737                                 if (ref->desc != target) {
1738                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1739                                                 proc->pid, thread->pid,
1740                                                 ref->desc);
1741                                 }
1742                         } else
1743                                 ref = binder_get_ref(proc, target);
1744                         if (ref == NULL) {
1745                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1746                                         proc->pid, thread->pid, target);
1747                                 break;
1748                         }
1749                         switch (cmd) {
1750                         case BC_INCREFS:
1751                                 debug_string = "IncRefs";
1752                                 binder_inc_ref(ref, 0, NULL);
1753                                 break;
1754                         case BC_ACQUIRE:
1755                                 debug_string = "Acquire";
1756                                 binder_inc_ref(ref, 1, NULL);
1757                                 break;
1758                         case BC_RELEASE:
1759                                 debug_string = "Release";
1760                                 binder_dec_ref(ref, 1);
1761                                 break;
1762                         case BC_DECREFS:
1763                         default:
1764                                 debug_string = "DecRefs";
1765                                 binder_dec_ref(ref, 0);
1766                                 break;
1767                         }
1768                         binder_debug(BINDER_DEBUG_USER_REFS,
1769                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1770                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1771                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1772                         break;
1773                 }
1774                 case BC_INCREFS_DONE:
1775                 case BC_ACQUIRE_DONE: {
1776                         void __user *node_ptr;
1777                         void __user *cookie;
1778                         struct binder_node *node;
1779
1780                         if (get_user(node_ptr, (void * __user *)ptr))
1781                                 return -EFAULT;
1782                         ptr += sizeof(void *);
1783                         if (get_user(cookie, (void * __user *)ptr))
1784                                 return -EFAULT;
1785                         ptr += sizeof(void *);
1786                         node = binder_get_node(proc, node_ptr);
1787                         if (node == NULL) {
1788                                 binder_user_error("%d:%d %s u%p no match\n",
1789                                         proc->pid, thread->pid,
1790                                         cmd == BC_INCREFS_DONE ?
1791                                         "BC_INCREFS_DONE" :
1792                                         "BC_ACQUIRE_DONE",
1793                                         node_ptr);
1794                                 break;
1795                         }
1796                         if (cookie != node->cookie) {
1797                                 binder_user_error("%d:%d %s u%p node %d cookie mismatch %p != %p\n",
1798                                         proc->pid, thread->pid,
1799                                         cmd == BC_INCREFS_DONE ?
1800                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1801                                         node_ptr, node->debug_id,
1802                                         cookie, node->cookie);
1803                                 break;
1804                         }
1805                         if (cmd == BC_ACQUIRE_DONE) {
1806                                 if (node->pending_strong_ref == 0) {
1807                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1808                                                 proc->pid, thread->pid,
1809                                                 node->debug_id);
1810                                         break;
1811                                 }
1812                                 node->pending_strong_ref = 0;
1813                         } else {
1814                                 if (node->pending_weak_ref == 0) {
1815                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1816                                                 proc->pid, thread->pid,
1817                                                 node->debug_id);
1818                                         break;
1819                                 }
1820                                 node->pending_weak_ref = 0;
1821                         }
1822                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1823                         binder_debug(BINDER_DEBUG_USER_REFS,
1824                                      "%d:%d %s node %d ls %d lw %d\n",
1825                                      proc->pid, thread->pid,
1826                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1827                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1828                         break;
1829                 }
1830                 case BC_ATTEMPT_ACQUIRE:
1831                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1832                         return -EINVAL;
1833                 case BC_ACQUIRE_RESULT:
1834                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1835                         return -EINVAL;
1836
1837                 case BC_FREE_BUFFER: {
1838                         void __user *data_ptr;
1839                         struct binder_buffer *buffer;
1840
1841                         if (get_user(data_ptr, (void * __user *)ptr))
1842                                 return -EFAULT;
1843                         ptr += sizeof(void *);
1844
1845                         buffer = binder_buffer_lookup(proc, data_ptr);
1846                         if (buffer == NULL) {
1847                                 binder_user_error("%d:%d BC_FREE_BUFFER u%p no match\n",
1848                                         proc->pid, thread->pid, data_ptr);
1849                                 break;
1850                         }
1851                         if (!buffer->allow_user_free) {
1852                                 binder_user_error("%d:%d BC_FREE_BUFFER u%p matched unreturned buffer\n",
1853                                         proc->pid, thread->pid, data_ptr);
1854                                 break;
1855                         }
1856                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1857                                      "%d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1858                                      proc->pid, thread->pid, data_ptr, buffer->debug_id,
1859                                      buffer->transaction ? "active" : "finished");
1860
1861                         if (buffer->transaction) {
1862                                 buffer->transaction->buffer = NULL;
1863                                 buffer->transaction = NULL;
1864                         }
1865                         if (buffer->async_transaction && buffer->target_node) {
1866                                 BUG_ON(!buffer->target_node->has_async_transaction);
1867                                 if (list_empty(&buffer->target_node->async_todo))
1868                                         buffer->target_node->has_async_transaction = 0;
1869                                 else
1870                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1871                         }
1872                         trace_binder_transaction_buffer_release(buffer);
1873                         binder_transaction_buffer_release(proc, buffer, NULL);
1874                         binder_free_buf(proc, buffer);
1875                         break;
1876                 }
1877
1878                 case BC_TRANSACTION:
1879                 case BC_REPLY: {
1880                         struct binder_transaction_data tr;
1881
1882                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1883                                 return -EFAULT;
1884                         ptr += sizeof(tr);
1885                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1886                         break;
1887                 }
1888
1889                 case BC_REGISTER_LOOPER:
1890                         binder_debug(BINDER_DEBUG_THREADS,
1891                                      "%d:%d BC_REGISTER_LOOPER\n",
1892                                      proc->pid, thread->pid);
1893                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1894                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1895                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1896                                         proc->pid, thread->pid);
1897                         } else if (proc->requested_threads == 0) {
1898                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1899                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1900                                         proc->pid, thread->pid);
1901                         } else {
1902                                 proc->requested_threads--;
1903                                 proc->requested_threads_started++;
1904                         }
1905                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1906                         break;
1907                 case BC_ENTER_LOOPER:
1908                         binder_debug(BINDER_DEBUG_THREADS,
1909                                      "%d:%d BC_ENTER_LOOPER\n",
1910                                      proc->pid, thread->pid);
1911                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1912                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1913                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1914                                         proc->pid, thread->pid);
1915                         }
1916                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1917                         break;
1918                 case BC_EXIT_LOOPER:
1919                         binder_debug(BINDER_DEBUG_THREADS,
1920                                      "%d:%d BC_EXIT_LOOPER\n",
1921                                      proc->pid, thread->pid);
1922                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1923                         break;
1924
1925                 case BC_REQUEST_DEATH_NOTIFICATION:
1926                 case BC_CLEAR_DEATH_NOTIFICATION: {
1927                         uint32_t target;
1928                         void __user *cookie;
1929                         struct binder_ref *ref;
1930                         struct binder_ref_death *death;
1931
1932                         if (get_user(target, (uint32_t __user *)ptr))
1933                                 return -EFAULT;
1934                         ptr += sizeof(uint32_t);
1935                         if (get_user(cookie, (void __user * __user *)ptr))
1936                                 return -EFAULT;
1937                         ptr += sizeof(void *);
1938                         ref = binder_get_ref(proc, target);
1939                         if (ref == NULL) {
1940                                 binder_user_error("%d:%d %s invalid ref %d\n",
1941                                         proc->pid, thread->pid,
1942                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1943                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1944                                         "BC_CLEAR_DEATH_NOTIFICATION",
1945                                         target);
1946                                 break;
1947                         }
1948
1949                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1950                                      "%d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
1951                                      proc->pid, thread->pid,
1952                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1953                                      "BC_REQUEST_DEATH_NOTIFICATION" :
1954                                      "BC_CLEAR_DEATH_NOTIFICATION",
1955                                      cookie, ref->debug_id, ref->desc,
1956                                      ref->strong, ref->weak, ref->node->debug_id);
1957
1958                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1959                                 if (ref->death) {
1960                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
1961                                                 proc->pid, thread->pid);
1962                                         break;
1963                                 }
1964                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
1965                                 if (death == NULL) {
1966                                         thread->return_error = BR_ERROR;
1967                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1968                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
1969                                                      proc->pid, thread->pid);
1970                                         break;
1971                                 }
1972                                 binder_stats_created(BINDER_STAT_DEATH);
1973                                 INIT_LIST_HEAD(&death->work.entry);
1974                                 death->cookie = cookie;
1975                                 ref->death = death;
1976                                 if (ref->node->proc == NULL) {
1977                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
1978                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1979                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
1980                                         } else {
1981                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
1982                                                 wake_up_interruptible(&proc->wait);
1983                                         }
1984                                 }
1985                         } else {
1986                                 if (ref->death == NULL) {
1987                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
1988                                                 proc->pid, thread->pid);
1989                                         break;
1990                                 }
1991                                 death = ref->death;
1992                                 if (death->cookie != cookie) {
1993                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %p != %p\n",
1994                                                 proc->pid, thread->pid,
1995                                                 death->cookie, cookie);
1996                                         break;
1997                                 }
1998                                 ref->death = NULL;
1999                                 if (list_empty(&death->work.entry)) {
2000                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2001                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2002                                                 list_add_tail(&death->work.entry, &thread->todo);
2003                                         } else {
2004                                                 list_add_tail(&death->work.entry, &proc->todo);
2005                                                 wake_up_interruptible(&proc->wait);
2006                                         }
2007                                 } else {
2008                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2009                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2010                                 }
2011                         }
2012                 } break;
2013                 case BC_DEAD_BINDER_DONE: {
2014                         struct binder_work *w;
2015                         void __user *cookie;
2016                         struct binder_ref_death *death = NULL;
2017                         if (get_user(cookie, (void __user * __user *)ptr))
2018                                 return -EFAULT;
2019
2020                         ptr += sizeof(void *);
2021                         list_for_each_entry(w, &proc->delivered_death, entry) {
2022                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2023                                 if (tmp_death->cookie == cookie) {
2024                                         death = tmp_death;
2025                                         break;
2026                                 }
2027                         }
2028                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2029                                      "%d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2030                                      proc->pid, thread->pid, cookie, death);
2031                         if (death == NULL) {
2032                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %p not found\n",
2033                                         proc->pid, thread->pid, cookie);
2034                                 break;
2035                         }
2036
2037                         list_del_init(&death->work.entry);
2038                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2039                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2040                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2041                                         list_add_tail(&death->work.entry, &thread->todo);
2042                                 } else {
2043                                         list_add_tail(&death->work.entry, &proc->todo);
2044                                         wake_up_interruptible(&proc->wait);
2045                                 }
2046                         }
2047                 } break;
2048
2049                 default:
2050                         pr_err("%d:%d unknown command %d\n",
2051                                proc->pid, thread->pid, cmd);
2052                         return -EINVAL;
2053                 }
2054                 *consumed = ptr - buffer;
2055         }
2056         return 0;
2057 }
2058
2059 static void binder_stat_br(struct binder_proc *proc,
2060                            struct binder_thread *thread, uint32_t cmd)
2061 {
2062         trace_binder_return(cmd);
2063         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2064                 binder_stats.br[_IOC_NR(cmd)]++;
2065                 proc->stats.br[_IOC_NR(cmd)]++;
2066                 thread->stats.br[_IOC_NR(cmd)]++;
2067         }
2068 }
2069
2070 static int binder_has_proc_work(struct binder_proc *proc,
2071                                 struct binder_thread *thread)
2072 {
2073         return !list_empty(&proc->todo) ||
2074                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2075 }
2076
2077 static int binder_has_thread_work(struct binder_thread *thread)
2078 {
2079         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2080                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2081 }
2082
2083 static int binder_thread_read(struct binder_proc *proc,
2084                               struct binder_thread *thread,
2085                               void  __user *buffer, size_t size,
2086                               size_t *consumed, int non_block)
2087 {
2088         void __user *ptr = buffer + *consumed;
2089         void __user *end = buffer + size;
2090
2091         int ret = 0;
2092         int wait_for_proc_work;
2093
2094         if (*consumed == 0) {
2095                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2096                         return -EFAULT;
2097                 ptr += sizeof(uint32_t);
2098         }
2099
2100 retry:
2101         wait_for_proc_work = thread->transaction_stack == NULL &&
2102                                 list_empty(&thread->todo);
2103
2104         if (thread->return_error != BR_OK && ptr < end) {
2105                 if (thread->return_error2 != BR_OK) {
2106                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2107                                 return -EFAULT;
2108                         ptr += sizeof(uint32_t);
2109                         binder_stat_br(proc, thread, thread->return_error2);
2110                         if (ptr == end)
2111                                 goto done;
2112                         thread->return_error2 = BR_OK;
2113                 }
2114                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2115                         return -EFAULT;
2116                 ptr += sizeof(uint32_t);
2117                 binder_stat_br(proc, thread, thread->return_error);
2118                 thread->return_error = BR_OK;
2119                 goto done;
2120         }
2121
2122
2123         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2124         if (wait_for_proc_work)
2125                 proc->ready_threads++;
2126
2127         binder_unlock(__func__);
2128
2129         trace_binder_wait_for_work(wait_for_proc_work,
2130                                    !!thread->transaction_stack,
2131                                    !list_empty(&thread->todo));
2132         if (wait_for_proc_work) {
2133                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2134                                         BINDER_LOOPER_STATE_ENTERED))) {
2135                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2136                                 proc->pid, thread->pid, thread->looper);
2137                         wait_event_interruptible(binder_user_error_wait,
2138                                                  binder_stop_on_user_error < 2);
2139                 }
2140                 binder_set_nice(proc->default_priority);
2141                 if (non_block) {
2142                         if (!binder_has_proc_work(proc, thread))
2143                                 ret = -EAGAIN;
2144                 } else
2145                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2146         } else {
2147                 if (non_block) {
2148                         if (!binder_has_thread_work(thread))
2149                                 ret = -EAGAIN;
2150                 } else
2151                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2152         }
2153
2154         binder_lock(__func__);
2155
2156         if (wait_for_proc_work)
2157                 proc->ready_threads--;
2158         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2159
2160         if (ret)
2161                 return ret;
2162
2163         while (1) {
2164                 uint32_t cmd;
2165                 struct binder_transaction_data tr;
2166                 struct binder_work *w;
2167                 struct binder_transaction *t = NULL;
2168
2169                 if (!list_empty(&thread->todo))
2170                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2171                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2172                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2173                 else {
2174                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2175                                 goto retry;
2176                         break;
2177                 }
2178
2179                 if (end - ptr < sizeof(tr) + 4)
2180                         break;
2181
2182                 switch (w->type) {
2183                 case BINDER_WORK_TRANSACTION: {
2184                         t = container_of(w, struct binder_transaction, work);
2185                 } break;
2186                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2187                         cmd = BR_TRANSACTION_COMPLETE;
2188                         if (put_user(cmd, (uint32_t __user *)ptr))
2189                                 return -EFAULT;
2190                         ptr += sizeof(uint32_t);
2191
2192                         binder_stat_br(proc, thread, cmd);
2193                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2194                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2195                                      proc->pid, thread->pid);
2196
2197                         list_del(&w->entry);
2198                         kfree(w);
2199                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2200                 } break;
2201                 case BINDER_WORK_NODE: {
2202                         struct binder_node *node = container_of(w, struct binder_node, work);
2203                         uint32_t cmd = BR_NOOP;
2204                         const char *cmd_name;
2205                         int strong = node->internal_strong_refs || node->local_strong_refs;
2206                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2207                         if (weak && !node->has_weak_ref) {
2208                                 cmd = BR_INCREFS;
2209                                 cmd_name = "BR_INCREFS";
2210                                 node->has_weak_ref = 1;
2211                                 node->pending_weak_ref = 1;
2212                                 node->local_weak_refs++;
2213                         } else if (strong && !node->has_strong_ref) {
2214                                 cmd = BR_ACQUIRE;
2215                                 cmd_name = "BR_ACQUIRE";
2216                                 node->has_strong_ref = 1;
2217                                 node->pending_strong_ref = 1;
2218                                 node->local_strong_refs++;
2219                         } else if (!strong && node->has_strong_ref) {
2220                                 cmd = BR_RELEASE;
2221                                 cmd_name = "BR_RELEASE";
2222                                 node->has_strong_ref = 0;
2223                         } else if (!weak && node->has_weak_ref) {
2224                                 cmd = BR_DECREFS;
2225                                 cmd_name = "BR_DECREFS";
2226                                 node->has_weak_ref = 0;
2227                         }
2228                         if (cmd != BR_NOOP) {
2229                                 if (put_user(cmd, (uint32_t __user *)ptr))
2230                                         return -EFAULT;
2231                                 ptr += sizeof(uint32_t);
2232                                 if (put_user(node->ptr, (void * __user *)ptr))
2233                                         return -EFAULT;
2234                                 ptr += sizeof(void *);
2235                                 if (put_user(node->cookie, (void * __user *)ptr))
2236                                         return -EFAULT;
2237                                 ptr += sizeof(void *);
2238
2239                                 binder_stat_br(proc, thread, cmd);
2240                                 binder_debug(BINDER_DEBUG_USER_REFS,
2241                                              "%d:%d %s %d u%p c%p\n",
2242                                              proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2243                         } else {
2244                                 list_del_init(&w->entry);
2245                                 if (!weak && !strong) {
2246                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2247                                                      "%d:%d node %d u%p c%p deleted\n",
2248                                                      proc->pid, thread->pid, node->debug_id,
2249                                                      node->ptr, node->cookie);
2250                                         rb_erase(&node->rb_node, &proc->nodes);
2251                                         kfree(node);
2252                                         binder_stats_deleted(BINDER_STAT_NODE);
2253                                 } else {
2254                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2255                                                      "%d:%d node %d u%p c%p state unchanged\n",
2256                                                      proc->pid, thread->pid, node->debug_id, node->ptr,
2257                                                      node->cookie);
2258                                 }
2259                         }
2260                 } break;
2261                 case BINDER_WORK_DEAD_BINDER:
2262                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2263                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2264                         struct binder_ref_death *death;
2265                         uint32_t cmd;
2266
2267                         death = container_of(w, struct binder_ref_death, work);
2268                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2269                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2270                         else
2271                                 cmd = BR_DEAD_BINDER;
2272                         if (put_user(cmd, (uint32_t __user *)ptr))
2273                                 return -EFAULT;
2274                         ptr += sizeof(uint32_t);
2275                         if (put_user(death->cookie, (void * __user *)ptr))
2276                                 return -EFAULT;
2277                         ptr += sizeof(void *);
2278                         binder_stat_br(proc, thread, cmd);
2279                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2280                                      "%d:%d %s %p\n",
2281                                       proc->pid, thread->pid,
2282                                       cmd == BR_DEAD_BINDER ?
2283                                       "BR_DEAD_BINDER" :
2284                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2285                                       death->cookie);
2286
2287                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2288                                 list_del(&w->entry);
2289                                 kfree(death);
2290                                 binder_stats_deleted(BINDER_STAT_DEATH);
2291                         } else
2292                                 list_move(&w->entry, &proc->delivered_death);
2293                         if (cmd == BR_DEAD_BINDER)
2294                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2295                 } break;
2296                 }
2297
2298                 if (!t)
2299                         continue;
2300
2301                 BUG_ON(t->buffer == NULL);
2302                 if (t->buffer->target_node) {
2303                         struct binder_node *target_node = t->buffer->target_node;
2304                         tr.target.ptr = target_node->ptr;
2305                         tr.cookie =  target_node->cookie;
2306                         t->saved_priority = task_nice(current);
2307                         if (t->priority < target_node->min_priority &&
2308                             !(t->flags & TF_ONE_WAY))
2309                                 binder_set_nice(t->priority);
2310                         else if (!(t->flags & TF_ONE_WAY) ||
2311                                  t->saved_priority > target_node->min_priority)
2312                                 binder_set_nice(target_node->min_priority);
2313                         cmd = BR_TRANSACTION;
2314                 } else {
2315                         tr.target.ptr = NULL;
2316                         tr.cookie = NULL;
2317                         cmd = BR_REPLY;
2318                 }
2319                 tr.code = t->code;
2320                 tr.flags = t->flags;
2321                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2322
2323                 if (t->from) {
2324                         struct task_struct *sender = t->from->proc->tsk;
2325                         tr.sender_pid = task_tgid_nr_ns(sender,
2326                                                         task_active_pid_ns(current));
2327                 } else {
2328                         tr.sender_pid = 0;
2329                 }
2330
2331                 tr.data_size = t->buffer->data_size;
2332                 tr.offsets_size = t->buffer->offsets_size;
2333                 tr.data.ptr.buffer = (void *)t->buffer->data +
2334                                         proc->user_buffer_offset;
2335                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2336                                         ALIGN(t->buffer->data_size,
2337                                             sizeof(void *));
2338
2339                 if (put_user(cmd, (uint32_t __user *)ptr))
2340                         return -EFAULT;
2341                 ptr += sizeof(uint32_t);
2342                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2343                         return -EFAULT;
2344                 ptr += sizeof(tr);
2345
2346                 trace_binder_transaction_received(t);
2347                 binder_stat_br(proc, thread, cmd);
2348                 binder_debug(BINDER_DEBUG_TRANSACTION,
2349                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %p-%p\n",
2350                              proc->pid, thread->pid,
2351                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2352                              "BR_REPLY",
2353                              t->debug_id, t->from ? t->from->proc->pid : 0,
2354                              t->from ? t->from->pid : 0, cmd,
2355                              t->buffer->data_size, t->buffer->offsets_size,
2356                              tr.data.ptr.buffer, tr.data.ptr.offsets);
2357
2358                 list_del(&t->work.entry);
2359                 t->buffer->allow_user_free = 1;
2360                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2361                         t->to_parent = thread->transaction_stack;
2362                         t->to_thread = thread;
2363                         thread->transaction_stack = t;
2364                 } else {
2365                         t->buffer->transaction = NULL;
2366                         kfree(t);
2367                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2368                 }
2369                 break;
2370         }
2371
2372 done:
2373
2374         *consumed = ptr - buffer;
2375         if (proc->requested_threads + proc->ready_threads == 0 &&
2376             proc->requested_threads_started < proc->max_threads &&
2377             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2378              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2379              /*spawn a new thread if we leave this out */) {
2380                 proc->requested_threads++;
2381                 binder_debug(BINDER_DEBUG_THREADS,
2382                              "%d:%d BR_SPAWN_LOOPER\n",
2383                              proc->pid, thread->pid);
2384                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2385                         return -EFAULT;
2386                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2387         }
2388         return 0;
2389 }
2390
2391 static void binder_release_work(struct list_head *list)
2392 {
2393         struct binder_work *w;
2394         while (!list_empty(list)) {
2395                 w = list_first_entry(list, struct binder_work, entry);
2396                 list_del_init(&w->entry);
2397                 switch (w->type) {
2398                 case BINDER_WORK_TRANSACTION: {
2399                         struct binder_transaction *t;
2400
2401                         t = container_of(w, struct binder_transaction, work);
2402                         if (t->buffer->target_node &&
2403                             !(t->flags & TF_ONE_WAY)) {
2404                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2405                         } else {
2406                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2407                                         "undelivered transaction %d\n",
2408                                         t->debug_id);
2409                                 t->buffer->transaction = NULL;
2410                                 kfree(t);
2411                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2412                         }
2413                 } break;
2414                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2415                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2416                                 "undelivered TRANSACTION_COMPLETE\n");
2417                         kfree(w);
2418                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2419                 } break;
2420                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2421                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2422                         struct binder_ref_death *death;
2423
2424                         death = container_of(w, struct binder_ref_death, work);
2425                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2426                                 "undelivered death notification, %p\n",
2427                                 death->cookie);
2428                         kfree(death);
2429                         binder_stats_deleted(BINDER_STAT_DEATH);
2430                 } break;
2431                 default:
2432                         pr_err("unexpected work type, %d, not freed\n",
2433                                w->type);
2434                         break;
2435                 }
2436         }
2437
2438 }
2439
2440 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2441 {
2442         struct binder_thread *thread = NULL;
2443         struct rb_node *parent = NULL;
2444         struct rb_node **p = &proc->threads.rb_node;
2445
2446         while (*p) {
2447                 parent = *p;
2448                 thread = rb_entry(parent, struct binder_thread, rb_node);
2449
2450                 if (current->pid < thread->pid)
2451                         p = &(*p)->rb_left;
2452                 else if (current->pid > thread->pid)
2453                         p = &(*p)->rb_right;
2454                 else
2455                         break;
2456         }
2457         if (*p == NULL) {
2458                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2459                 if (thread == NULL)
2460                         return NULL;
2461                 binder_stats_created(BINDER_STAT_THREAD);
2462                 thread->proc = proc;
2463                 thread->pid = current->pid;
2464                 init_waitqueue_head(&thread->wait);
2465                 INIT_LIST_HEAD(&thread->todo);
2466                 rb_link_node(&thread->rb_node, parent, p);
2467                 rb_insert_color(&thread->rb_node, &proc->threads);
2468                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2469                 thread->return_error = BR_OK;
2470                 thread->return_error2 = BR_OK;
2471         }
2472         return thread;
2473 }
2474
2475 static int binder_free_thread(struct binder_proc *proc,
2476                               struct binder_thread *thread)
2477 {
2478         struct binder_transaction *t;
2479         struct binder_transaction *send_reply = NULL;
2480         int active_transactions = 0;
2481
2482         rb_erase(&thread->rb_node, &proc->threads);
2483         t = thread->transaction_stack;
2484         if (t && t->to_thread == thread)
2485                 send_reply = t;
2486         while (t) {
2487                 active_transactions++;
2488                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2489                              "release %d:%d transaction %d %s, still active\n",
2490                               proc->pid, thread->pid,
2491                              t->debug_id,
2492                              (t->to_thread == thread) ? "in" : "out");
2493
2494                 if (t->to_thread == thread) {
2495                         t->to_proc = NULL;
2496                         t->to_thread = NULL;
2497                         if (t->buffer) {
2498                                 t->buffer->transaction = NULL;
2499                                 t->buffer = NULL;
2500                         }
2501                         t = t->to_parent;
2502                 } else if (t->from == thread) {
2503                         t->from = NULL;
2504                         t = t->from_parent;
2505                 } else
2506                         BUG();
2507         }
2508         if (send_reply)
2509                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2510         binder_release_work(&thread->todo);
2511         kfree(thread);
2512         binder_stats_deleted(BINDER_STAT_THREAD);
2513         return active_transactions;
2514 }
2515
2516 static unsigned int binder_poll(struct file *filp,
2517                                 struct poll_table_struct *wait)
2518 {
2519         struct binder_proc *proc = filp->private_data;
2520         struct binder_thread *thread = NULL;
2521         int wait_for_proc_work;
2522
2523         binder_lock(__func__);
2524
2525         thread = binder_get_thread(proc);
2526
2527         wait_for_proc_work = thread->transaction_stack == NULL &&
2528                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2529
2530         binder_unlock(__func__);
2531
2532         if (wait_for_proc_work) {
2533                 if (binder_has_proc_work(proc, thread))
2534                         return POLLIN;
2535                 poll_wait(filp, &proc->wait, wait);
2536                 if (binder_has_proc_work(proc, thread))
2537                         return POLLIN;
2538         } else {
2539                 if (binder_has_thread_work(thread))
2540                         return POLLIN;
2541                 poll_wait(filp, &thread->wait, wait);
2542                 if (binder_has_thread_work(thread))
2543                         return POLLIN;
2544         }
2545         return 0;
2546 }
2547
2548 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2549 {
2550         int ret;
2551         struct binder_proc *proc = filp->private_data;
2552         struct binder_thread *thread;
2553         unsigned int size = _IOC_SIZE(cmd);
2554         void __user *ubuf = (void __user *)arg;
2555
2556         /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2557
2558         trace_binder_ioctl(cmd, arg);
2559
2560         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2561         if (ret)
2562                 goto err_unlocked;
2563
2564         binder_lock(__func__);
2565         thread = binder_get_thread(proc);
2566         if (thread == NULL) {
2567                 ret = -ENOMEM;
2568                 goto err;
2569         }
2570
2571         switch (cmd) {
2572         case BINDER_WRITE_READ: {
2573                 struct binder_write_read bwr;
2574                 if (size != sizeof(struct binder_write_read)) {
2575                         ret = -EINVAL;
2576                         goto err;
2577                 }
2578                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2579                         ret = -EFAULT;
2580                         goto err;
2581                 }
2582                 binder_debug(BINDER_DEBUG_READ_WRITE,
2583                              "%d:%d write %zd at %016lx, read %zd at %016lx\n",
2584                              proc->pid, thread->pid, bwr.write_size,
2585                              bwr.write_buffer, bwr.read_size, bwr.read_buffer);
2586
2587                 if (bwr.write_size > 0) {
2588                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2589                         trace_binder_write_done(ret);
2590                         if (ret < 0) {
2591                                 bwr.read_consumed = 0;
2592                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2593                                         ret = -EFAULT;
2594                                 goto err;
2595                         }
2596                 }
2597                 if (bwr.read_size > 0) {
2598                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2599                         trace_binder_read_done(ret);
2600                         if (!list_empty(&proc->todo))
2601                                 wake_up_interruptible(&proc->wait);
2602                         if (ret < 0) {
2603                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2604                                         ret = -EFAULT;
2605                                 goto err;
2606                         }
2607                 }
2608                 binder_debug(BINDER_DEBUG_READ_WRITE,
2609                              "%d:%d wrote %zd of %zd, read return %zd of %zd\n",
2610                              proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2611                              bwr.read_consumed, bwr.read_size);
2612                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2613                         ret = -EFAULT;
2614                         goto err;
2615                 }
2616                 break;
2617         }
2618         case BINDER_SET_MAX_THREADS:
2619                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2620                         ret = -EINVAL;
2621                         goto err;
2622                 }
2623                 break;
2624         case BINDER_SET_CONTEXT_MGR:
2625                 if (binder_context_mgr_node != NULL) {
2626                         pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2627                         ret = -EBUSY;
2628                         goto err;
2629                 }
2630                 if (uid_valid(binder_context_mgr_uid)) {
2631                         if (!uid_eq(binder_context_mgr_uid, current->cred->euid)) {
2632                                 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2633                                        from_kuid(&init_user_ns, current->cred->euid),
2634                                        from_kuid(&init_user_ns, binder_context_mgr_uid));
2635                                 ret = -EPERM;
2636                                 goto err;
2637                         }
2638                 } else
2639                         binder_context_mgr_uid = current->cred->euid;
2640                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2641                 if (binder_context_mgr_node == NULL) {
2642                         ret = -ENOMEM;
2643                         goto err;
2644                 }
2645                 binder_context_mgr_node->local_weak_refs++;
2646                 binder_context_mgr_node->local_strong_refs++;
2647                 binder_context_mgr_node->has_strong_ref = 1;
2648                 binder_context_mgr_node->has_weak_ref = 1;
2649                 break;
2650         case BINDER_THREAD_EXIT:
2651                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2652                              proc->pid, thread->pid);
2653                 binder_free_thread(proc, thread);
2654                 thread = NULL;
2655                 break;
2656         case BINDER_VERSION:
2657                 if (size != sizeof(struct binder_version)) {
2658                         ret = -EINVAL;
2659                         goto err;
2660                 }
2661                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2662                         ret = -EINVAL;
2663                         goto err;
2664                 }
2665                 break;
2666         default:
2667                 ret = -EINVAL;
2668                 goto err;
2669         }
2670         ret = 0;
2671 err:
2672         if (thread)
2673                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2674         binder_unlock(__func__);
2675         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2676         if (ret && ret != -ERESTARTSYS)
2677                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2678 err_unlocked:
2679         trace_binder_ioctl_done(ret);
2680         return ret;
2681 }
2682
2683 static void binder_vma_open(struct vm_area_struct *vma)
2684 {
2685         struct binder_proc *proc = vma->vm_private_data;
2686         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2687                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2688                      proc->pid, vma->vm_start, vma->vm_end,
2689                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2690                      (unsigned long)pgprot_val(vma->vm_page_prot));
2691 }
2692
2693 static void binder_vma_close(struct vm_area_struct *vma)
2694 {
2695         struct binder_proc *proc = vma->vm_private_data;
2696         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2697                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2698                      proc->pid, vma->vm_start, vma->vm_end,
2699                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2700                      (unsigned long)pgprot_val(vma->vm_page_prot));
2701         proc->vma = NULL;
2702         proc->vma_vm_mm = NULL;
2703         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2704 }
2705
2706 static struct vm_operations_struct binder_vm_ops = {
2707         .open = binder_vma_open,
2708         .close = binder_vma_close,
2709 };
2710
2711 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2712 {
2713         int ret;
2714         struct vm_struct *area;
2715         struct binder_proc *proc = filp->private_data;
2716         const char *failure_string;
2717         struct binder_buffer *buffer;
2718
2719         if (proc->tsk != current)
2720                 return -EINVAL;
2721
2722         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2723                 vma->vm_end = vma->vm_start + SZ_4M;
2724
2725         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2726                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2727                      proc->pid, vma->vm_start, vma->vm_end,
2728                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2729                      (unsigned long)pgprot_val(vma->vm_page_prot));
2730
2731         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2732                 ret = -EPERM;
2733                 failure_string = "bad vm_flags";
2734                 goto err_bad_arg;
2735         }
2736         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2737
2738         mutex_lock(&binder_mmap_lock);
2739         if (proc->buffer) {
2740                 ret = -EBUSY;
2741                 failure_string = "already mapped";
2742                 goto err_already_mapped;
2743         }
2744
2745         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2746         if (area == NULL) {
2747                 ret = -ENOMEM;
2748                 failure_string = "get_vm_area";
2749                 goto err_get_vm_area_failed;
2750         }
2751         proc->buffer = area->addr;
2752         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2753         mutex_unlock(&binder_mmap_lock);
2754
2755 #ifdef CONFIG_CPU_CACHE_VIPT
2756         if (cache_is_vipt_aliasing()) {
2757                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2758                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2759                         vma->vm_start += PAGE_SIZE;
2760                 }
2761         }
2762 #endif
2763         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2764         if (proc->pages == NULL) {
2765                 ret = -ENOMEM;
2766                 failure_string = "alloc page array";
2767                 goto err_alloc_pages_failed;
2768         }
2769         proc->buffer_size = vma->vm_end - vma->vm_start;
2770
2771         vma->vm_ops = &binder_vm_ops;
2772         vma->vm_private_data = proc;
2773
2774         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2775                 ret = -ENOMEM;
2776                 failure_string = "alloc small buf";
2777                 goto err_alloc_small_buf_failed;
2778         }
2779         buffer = proc->buffer;
2780         INIT_LIST_HEAD(&proc->buffers);
2781         list_add(&buffer->entry, &proc->buffers);
2782         buffer->free = 1;
2783         binder_insert_free_buffer(proc, buffer);
2784         proc->free_async_space = proc->buffer_size / 2;
2785         barrier();
2786         proc->files = get_files_struct(current);
2787         proc->vma = vma;
2788         proc->vma_vm_mm = vma->vm_mm;
2789
2790         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2791                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2792         return 0;
2793
2794 err_alloc_small_buf_failed:
2795         kfree(proc->pages);
2796         proc->pages = NULL;
2797 err_alloc_pages_failed:
2798         mutex_lock(&binder_mmap_lock);
2799         vfree(proc->buffer);
2800         proc->buffer = NULL;
2801 err_get_vm_area_failed:
2802 err_already_mapped:
2803         mutex_unlock(&binder_mmap_lock);
2804 err_bad_arg:
2805         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2806                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2807         return ret;
2808 }
2809
2810 static int binder_open(struct inode *nodp, struct file *filp)
2811 {
2812         struct binder_proc *proc;
2813
2814         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2815                      current->group_leader->pid, current->pid);
2816
2817         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2818         if (proc == NULL)
2819                 return -ENOMEM;
2820         get_task_struct(current);
2821         proc->tsk = current;
2822         INIT_LIST_HEAD(&proc->todo);
2823         init_waitqueue_head(&proc->wait);
2824         proc->default_priority = task_nice(current);
2825
2826         binder_lock(__func__);
2827
2828         binder_stats_created(BINDER_STAT_PROC);
2829         hlist_add_head(&proc->proc_node, &binder_procs);
2830         proc->pid = current->group_leader->pid;
2831         INIT_LIST_HEAD(&proc->delivered_death);
2832         filp->private_data = proc;
2833
2834         binder_unlock(__func__);
2835
2836         if (binder_debugfs_dir_entry_proc) {
2837                 char strbuf[11];
2838                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2839                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2840                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2841         }
2842
2843         return 0;
2844 }
2845
2846 static int binder_flush(struct file *filp, fl_owner_t id)
2847 {
2848         struct binder_proc *proc = filp->private_data;
2849
2850         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2851
2852         return 0;
2853 }
2854
2855 static void binder_deferred_flush(struct binder_proc *proc)
2856 {
2857         struct rb_node *n;
2858         int wake_count = 0;
2859         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2860                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2861                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2862                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2863                         wake_up_interruptible(&thread->wait);
2864                         wake_count++;
2865                 }
2866         }
2867         wake_up_interruptible_all(&proc->wait);
2868
2869         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2870                      "binder_flush: %d woke %d threads\n", proc->pid,
2871                      wake_count);
2872 }
2873
2874 static int binder_release(struct inode *nodp, struct file *filp)
2875 {
2876         struct binder_proc *proc = filp->private_data;
2877         debugfs_remove(proc->debugfs_entry);
2878         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2879
2880         return 0;
2881 }
2882
2883 static int binder_node_release(struct binder_node *node, int refs)
2884 {
2885         struct binder_ref *ref;
2886         int death = 0;
2887
2888         list_del_init(&node->work.entry);
2889         binder_release_work(&node->async_todo);
2890
2891         if (hlist_empty(&node->refs)) {
2892                 kfree(node);
2893                 binder_stats_deleted(BINDER_STAT_NODE);
2894
2895                 return refs;
2896         }
2897
2898         node->proc = NULL;
2899         node->local_strong_refs = 0;
2900         node->local_weak_refs = 0;
2901         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2902
2903         hlist_for_each_entry(ref, &node->refs, node_entry) {
2904                 refs++;
2905
2906                 if (!ref->death)
2907                         goto out;
2908
2909                 death++;
2910
2911                 if (list_empty(&ref->death->work.entry)) {
2912                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2913                         list_add_tail(&ref->death->work.entry,
2914                                       &ref->proc->todo);
2915                         wake_up_interruptible(&ref->proc->wait);
2916                 } else
2917                         BUG();
2918         }
2919
2920 out:
2921         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2922                      "node %d now dead, refs %d, death %d\n",
2923                      node->debug_id, refs, death);
2924
2925         return refs;
2926 }
2927
2928 static void binder_deferred_release(struct binder_proc *proc)
2929 {
2930         struct binder_transaction *t;
2931         struct rb_node *n;
2932         int threads, nodes, incoming_refs, outgoing_refs, buffers,
2933                 active_transactions, page_count;
2934
2935         BUG_ON(proc->vma);
2936         BUG_ON(proc->files);
2937
2938         hlist_del(&proc->proc_node);
2939
2940         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2941                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2942                              "%s: %d context_mgr_node gone\n",
2943                              __func__, proc->pid);
2944                 binder_context_mgr_node = NULL;
2945         }
2946
2947         threads = 0;
2948         active_transactions = 0;
2949         while ((n = rb_first(&proc->threads))) {
2950                 struct binder_thread *thread;
2951
2952                 thread = rb_entry(n, struct binder_thread, rb_node);
2953                 threads++;
2954                 active_transactions += binder_free_thread(proc, thread);
2955         }
2956
2957         nodes = 0;
2958         incoming_refs = 0;
2959         while ((n = rb_first(&proc->nodes))) {
2960                 struct binder_node *node;
2961
2962                 node = rb_entry(n, struct binder_node, rb_node);
2963                 nodes++;
2964                 rb_erase(&node->rb_node, &proc->nodes);
2965                 incoming_refs = binder_node_release(node, incoming_refs);
2966         }
2967
2968         outgoing_refs = 0;
2969         while ((n = rb_first(&proc->refs_by_desc))) {
2970                 struct binder_ref *ref;
2971
2972                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
2973                 outgoing_refs++;
2974                 binder_delete_ref(ref);
2975         }
2976
2977         binder_release_work(&proc->todo);
2978         binder_release_work(&proc->delivered_death);
2979
2980         buffers = 0;
2981         while ((n = rb_first(&proc->allocated_buffers))) {
2982                 struct binder_buffer *buffer;
2983
2984                 buffer = rb_entry(n, struct binder_buffer, rb_node);
2985
2986                 t = buffer->transaction;
2987                 if (t) {
2988                         t->buffer = NULL;
2989                         buffer->transaction = NULL;
2990                         pr_err("release proc %d, transaction %d, not freed\n",
2991                                proc->pid, t->debug_id);
2992                         /*BUG();*/
2993                 }
2994
2995                 binder_free_buf(proc, buffer);
2996                 buffers++;
2997         }
2998
2999         binder_stats_deleted(BINDER_STAT_PROC);
3000
3001         page_count = 0;
3002         if (proc->pages) {
3003                 int i;
3004
3005                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3006                         void *page_addr;
3007
3008                         if (!proc->pages[i])
3009                                 continue;
3010
3011                         page_addr = proc->buffer + i * PAGE_SIZE;
3012                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3013                                      "%s: %d: page %d at %p not freed\n",
3014                                      __func__, proc->pid, i, page_addr);
3015                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3016                         __free_page(proc->pages[i]);
3017                         page_count++;
3018                 }
3019                 kfree(proc->pages);
3020                 vfree(proc->buffer);
3021         }
3022
3023         put_task_struct(proc->tsk);
3024
3025         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3026                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3027                      __func__, proc->pid, threads, nodes, incoming_refs,
3028                      outgoing_refs, active_transactions, buffers, page_count);
3029
3030         kfree(proc);
3031 }
3032
3033 static void binder_deferred_func(struct work_struct *work)
3034 {
3035         struct binder_proc *proc;
3036         struct files_struct *files;
3037
3038         int defer;
3039         do {
3040                 binder_lock(__func__);
3041                 mutex_lock(&binder_deferred_lock);
3042                 if (!hlist_empty(&binder_deferred_list)) {
3043                         proc = hlist_entry(binder_deferred_list.first,
3044                                         struct binder_proc, deferred_work_node);
3045                         hlist_del_init(&proc->deferred_work_node);
3046                         defer = proc->deferred_work;
3047                         proc->deferred_work = 0;
3048                 } else {
3049                         proc = NULL;
3050                         defer = 0;
3051                 }
3052                 mutex_unlock(&binder_deferred_lock);
3053
3054                 files = NULL;
3055                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3056                         files = proc->files;
3057                         if (files)
3058                                 proc->files = NULL;
3059                 }
3060
3061                 if (defer & BINDER_DEFERRED_FLUSH)
3062                         binder_deferred_flush(proc);
3063
3064                 if (defer & BINDER_DEFERRED_RELEASE)
3065                         binder_deferred_release(proc); /* frees proc */
3066
3067                 binder_unlock(__func__);
3068                 if (files)
3069                         put_files_struct(files);
3070         } while (proc);
3071 }
3072 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3073
3074 static void
3075 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3076 {
3077         mutex_lock(&binder_deferred_lock);
3078         proc->deferred_work |= defer;
3079         if (hlist_unhashed(&proc->deferred_work_node)) {
3080                 hlist_add_head(&proc->deferred_work_node,
3081                                 &binder_deferred_list);
3082                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3083         }
3084         mutex_unlock(&binder_deferred_lock);
3085 }
3086
3087 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3088                                      struct binder_transaction *t)
3089 {
3090         seq_printf(m,
3091                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3092                    prefix, t->debug_id, t,
3093                    t->from ? t->from->proc->pid : 0,
3094                    t->from ? t->from->pid : 0,
3095                    t->to_proc ? t->to_proc->pid : 0,
3096                    t->to_thread ? t->to_thread->pid : 0,
3097                    t->code, t->flags, t->priority, t->need_reply);
3098         if (t->buffer == NULL) {
3099                 seq_puts(m, " buffer free\n");
3100                 return;
3101         }
3102         if (t->buffer->target_node)
3103                 seq_printf(m, " node %d",
3104                            t->buffer->target_node->debug_id);
3105         seq_printf(m, " size %zd:%zd data %p\n",
3106                    t->buffer->data_size, t->buffer->offsets_size,
3107                    t->buffer->data);
3108 }
3109
3110 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3111                                 struct binder_buffer *buffer)
3112 {
3113         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3114                    prefix, buffer->debug_id, buffer->data,
3115                    buffer->data_size, buffer->offsets_size,
3116                    buffer->transaction ? "active" : "delivered");
3117 }
3118
3119 static void print_binder_work(struct seq_file *m, const char *prefix,
3120                               const char *transaction_prefix,
3121                               struct binder_work *w)
3122 {
3123         struct binder_node *node;
3124         struct binder_transaction *t;
3125
3126         switch (w->type) {
3127         case BINDER_WORK_TRANSACTION:
3128                 t = container_of(w, struct binder_transaction, work);
3129                 print_binder_transaction(m, transaction_prefix, t);
3130                 break;
3131         case BINDER_WORK_TRANSACTION_COMPLETE:
3132                 seq_printf(m, "%stransaction complete\n", prefix);
3133                 break;
3134         case BINDER_WORK_NODE:
3135                 node = container_of(w, struct binder_node, work);
3136                 seq_printf(m, "%snode work %d: u%p c%p\n",
3137                            prefix, node->debug_id, node->ptr, node->cookie);
3138                 break;
3139         case BINDER_WORK_DEAD_BINDER:
3140                 seq_printf(m, "%shas dead binder\n", prefix);
3141                 break;
3142         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3143                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3144                 break;
3145         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3146                 seq_printf(m, "%shas cleared death notification\n", prefix);
3147                 break;
3148         default:
3149                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3150                 break;
3151         }
3152 }
3153
3154 static void print_binder_thread(struct seq_file *m,
3155                                 struct binder_thread *thread,
3156                                 int print_always)
3157 {
3158         struct binder_transaction *t;
3159         struct binder_work *w;
3160         size_t start_pos = m->count;
3161         size_t header_pos;
3162
3163         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3164         header_pos = m->count;
3165         t = thread->transaction_stack;
3166         while (t) {
3167                 if (t->from == thread) {
3168                         print_binder_transaction(m,
3169                                                  "    outgoing transaction", t);
3170                         t = t->from_parent;
3171                 } else if (t->to_thread == thread) {
3172                         print_binder_transaction(m,
3173                                                  "    incoming transaction", t);
3174                         t = t->to_parent;
3175                 } else {
3176                         print_binder_transaction(m, "    bad transaction", t);
3177                         t = NULL;
3178                 }
3179         }
3180         list_for_each_entry(w, &thread->todo, entry) {
3181                 print_binder_work(m, "    ", "    pending transaction", w);
3182         }
3183         if (!print_always && m->count == header_pos)
3184                 m->count = start_pos;
3185 }
3186
3187 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3188 {
3189         struct binder_ref *ref;
3190         struct binder_work *w;
3191         int count;
3192
3193         count = 0;
3194         hlist_for_each_entry(ref, &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, &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 * const 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 * const 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 * const 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 binder_node *node;
3403         int do_lock = !binder_debug_no_lock;
3404
3405         if (do_lock)
3406                 binder_lock(__func__);
3407
3408         seq_puts(m, "binder state:\n");
3409
3410         if (!hlist_empty(&binder_dead_nodes))
3411                 seq_puts(m, "dead nodes:\n");
3412         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3413                 print_binder_node(m, node);
3414
3415         hlist_for_each_entry(proc, &binder_procs, proc_node)
3416                 print_binder_proc(m, proc, 1);
3417         if (do_lock)
3418                 binder_unlock(__func__);
3419         return 0;
3420 }
3421
3422 static int binder_stats_show(struct seq_file *m, void *unused)
3423 {
3424         struct binder_proc *proc;
3425         int do_lock = !binder_debug_no_lock;
3426
3427         if (do_lock)
3428                 binder_lock(__func__);
3429
3430         seq_puts(m, "binder stats:\n");
3431
3432         print_binder_stats(m, "", &binder_stats);
3433
3434         hlist_for_each_entry(proc, &binder_procs, proc_node)
3435                 print_binder_proc_stats(m, proc);
3436         if (do_lock)
3437                 binder_unlock(__func__);
3438         return 0;
3439 }
3440
3441 static int binder_transactions_show(struct seq_file *m, void *unused)
3442 {
3443         struct binder_proc *proc;
3444         int do_lock = !binder_debug_no_lock;
3445
3446         if (do_lock)
3447                 binder_lock(__func__);
3448
3449         seq_puts(m, "binder transactions:\n");
3450         hlist_for_each_entry(proc, &binder_procs, proc_node)
3451                 print_binder_proc(m, proc, 0);
3452         if (do_lock)
3453                 binder_unlock(__func__);
3454         return 0;
3455 }
3456
3457 static int binder_proc_show(struct seq_file *m, void *unused)
3458 {
3459         struct binder_proc *proc = m->private;
3460         int do_lock = !binder_debug_no_lock;
3461
3462         if (do_lock)
3463                 binder_lock(__func__);
3464         seq_puts(m, "binder proc state:\n");
3465         print_binder_proc(m, proc, 1);
3466         if (do_lock)
3467                 binder_unlock(__func__);
3468         return 0;
3469 }
3470
3471 static void print_binder_transaction_log_entry(struct seq_file *m,
3472                                         struct binder_transaction_log_entry *e)
3473 {
3474         seq_printf(m,
3475                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3476                    e->debug_id, (e->call_type == 2) ? "reply" :
3477                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3478                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3479                    e->target_handle, e->data_size, e->offsets_size);
3480 }
3481
3482 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3483 {
3484         struct binder_transaction_log *log = m->private;
3485         int i;
3486
3487         if (log->full) {
3488                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3489                         print_binder_transaction_log_entry(m, &log->entry[i]);
3490         }
3491         for (i = 0; i < log->next; i++)
3492                 print_binder_transaction_log_entry(m, &log->entry[i]);
3493         return 0;
3494 }
3495
3496 static const struct file_operations binder_fops = {
3497         .owner = THIS_MODULE,
3498         .poll = binder_poll,
3499         .unlocked_ioctl = binder_ioctl,
3500         .mmap = binder_mmap,
3501         .open = binder_open,
3502         .flush = binder_flush,
3503         .release = binder_release,
3504 };
3505
3506 static struct miscdevice binder_miscdev = {
3507         .minor = MISC_DYNAMIC_MINOR,
3508         .name = "binder",
3509         .fops = &binder_fops
3510 };
3511
3512 BINDER_DEBUG_ENTRY(state);
3513 BINDER_DEBUG_ENTRY(stats);
3514 BINDER_DEBUG_ENTRY(transactions);
3515 BINDER_DEBUG_ENTRY(transaction_log);
3516
3517 static int __init binder_init(void)
3518 {
3519         int ret;
3520
3521         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3522         if (!binder_deferred_workqueue)
3523                 return -ENOMEM;
3524
3525         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3526         if (binder_debugfs_dir_entry_root)
3527                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3528                                                  binder_debugfs_dir_entry_root);
3529         ret = misc_register(&binder_miscdev);
3530         if (binder_debugfs_dir_entry_root) {
3531                 debugfs_create_file("state",
3532                                     S_IRUGO,
3533                                     binder_debugfs_dir_entry_root,
3534                                     NULL,
3535                                     &binder_state_fops);
3536                 debugfs_create_file("stats",
3537                                     S_IRUGO,
3538                                     binder_debugfs_dir_entry_root,
3539                                     NULL,
3540                                     &binder_stats_fops);
3541                 debugfs_create_file("transactions",
3542                                     S_IRUGO,
3543                                     binder_debugfs_dir_entry_root,
3544                                     NULL,
3545                                     &binder_transactions_fops);
3546                 debugfs_create_file("transaction_log",
3547                                     S_IRUGO,
3548                                     binder_debugfs_dir_entry_root,
3549                                     &binder_transaction_log,
3550                                     &binder_transaction_log_fops);
3551                 debugfs_create_file("failed_transaction_log",
3552                                     S_IRUGO,
3553                                     binder_debugfs_dir_entry_root,
3554                                     &binder_transaction_log_failed,
3555                                     &binder_transaction_log_fops);
3556         }
3557         return ret;
3558 }
3559
3560 device_initcall(binder_init);
3561
3562 #define CREATE_TRACE_POINTS
3563 #include "binder_trace.h"
3564
3565 MODULE_LICENSE("GPL v2");