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         binder_uintptr_t ptr;
 232         binder_uintptr_t 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         binder_uintptr_t 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                                                   uintptr_t 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 = (struct binder_buffer *)(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                                            binder_uintptr_t 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                                            binder_uintptr_t ptr,
 879                                            binder_uintptr_t 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%016llx c%016llx created\n",
 912                      proc->pid, current->pid, node->debug_id,
 913                      (u64)node->ptr, (u64)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                                               binder_size_t *failed_at)
1230 {
1231         binder_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 = (binder_size_t *)(buffer->data +
1243                                  ALIGN(buffer->data_size, sizeof(void *)));
1244         if (failed_at)
1245                 off_end = failed_at;
1246         else
1247                 off_end = (void *)offp + buffer->offsets_size;
1248         for (; offp < off_end; offp++) {
1249                 struct flat_binder_object *fp;
1250                 if (*offp > buffer->data_size - sizeof(*fp) ||
1251                     buffer->data_size < sizeof(*fp) ||
1252                     !IS_ALIGNED(*offp, sizeof(u32))) {
1253                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1254                                debug_id, (u64)*offp, buffer->data_size);
1255                         continue;
1256                 }
1257                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1258                 switch (fp->type) {
1259                 case BINDER_TYPE_BINDER:
1260                 case BINDER_TYPE_WEAK_BINDER: {
1261                         struct binder_node *node = binder_get_node(proc, fp->binder);
1262                         if (node == NULL) {
1263                                 pr_err("transaction release %d bad node %016llx\n",
1264                                        debug_id, (u64)fp->binder);
1265                                 break;
1266                         }
1267                         binder_debug(BINDER_DEBUG_TRANSACTION,
1268                                      "        node %d u%016llx\n",
1269                                      node->debug_id, (u64)node->ptr);
1270                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1271                 } break;
1272                 case BINDER_TYPE_HANDLE:
1273                 case BINDER_TYPE_WEAK_HANDLE: {
1274                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1275                         if (ref == NULL) {
1276                                 pr_err("transaction release %d bad handle %d\n",
1277                                  debug_id, fp->handle);
1278                                 break;
1279                         }
1280                         binder_debug(BINDER_DEBUG_TRANSACTION,
1281                                      "        ref %d desc %d (node %d)\n",
1282                                      ref->debug_id, ref->desc, ref->node->debug_id);
1283                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1284                 } break;
1285
1286                 case BINDER_TYPE_FD:
1287                         binder_debug(BINDER_DEBUG_TRANSACTION,
1288                                      "        fd %d\n", fp->handle);
1289                         if (failed_at)
1290                                 task_close_fd(proc, fp->handle);
1291                         break;
1292
1293                 default:
1294                         pr_err("transaction release %d bad object type %x\n",
1295                                 debug_id, fp->type);
1296                         break;
1297                 }
1298         }
1299 }
1300
1301 static void binder_transaction(struct binder_proc *proc,
1302                                struct binder_thread *thread,
1303                                struct binder_transaction_data *tr, int reply)
1304 {
1305         struct binder_transaction *t;
1306         struct binder_work *tcomplete;
1307         binder_size_t *offp, *off_end;
1308         struct binder_proc *target_proc;
1309         struct binder_thread *target_thread = NULL;
1310         struct binder_node *target_node = NULL;
1311         struct list_head *target_list;
1312         wait_queue_head_t *target_wait;
1313         struct binder_transaction *in_reply_to = NULL;
1314         struct binder_transaction_log_entry *e;
1315         uint32_t return_error;
1316
1317         e = binder_transaction_log_add(&binder_transaction_log);
1318         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1319         e->from_proc = proc->pid;
1320         e->from_thread = thread->pid;
1321         e->target_handle = tr->target.handle;
1322         e->data_size = tr->data_size;
1323         e->offsets_size = tr->offsets_size;
1324
1325         if (reply) {
1326                 in_reply_to = thread->transaction_stack;
1327                 if (in_reply_to == NULL) {
1328                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1329                                           proc->pid, thread->pid);
1330                         return_error = BR_FAILED_REPLY;
1331                         goto err_empty_call_stack;
1332                 }
1333                 binder_set_nice(in_reply_to->saved_priority);
1334                 if (in_reply_to->to_thread != thread) {
1335                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1336                                 proc->pid, thread->pid, in_reply_to->debug_id,
1337                                 in_reply_to->to_proc ?
1338                                 in_reply_to->to_proc->pid : 0,
1339                                 in_reply_to->to_thread ?
1340                                 in_reply_to->to_thread->pid : 0);
1341                         return_error = BR_FAILED_REPLY;
1342                         in_reply_to = NULL;
1343                         goto err_bad_call_stack;
1344                 }
1345                 thread->transaction_stack = in_reply_to->to_parent;
1346                 target_thread = in_reply_to->from;
1347                 if (target_thread == NULL) {
1348                         return_error = BR_DEAD_REPLY;
1349                         goto err_dead_binder;
1350                 }
1351                 if (target_thread->transaction_stack != in_reply_to) {
1352                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1353                                 proc->pid, thread->pid,
1354                                 target_thread->transaction_stack ?
1355                                 target_thread->transaction_stack->debug_id : 0,
1356                                 in_reply_to->debug_id);
1357                         return_error = BR_FAILED_REPLY;
1358                         in_reply_to = NULL;
1359                         target_thread = NULL;
1360                         goto err_dead_binder;
1361                 }
1362                 target_proc = target_thread->proc;
1363         } else {
1364                 if (tr->target.handle) {
1365                         struct binder_ref *ref;
1366                         ref = binder_get_ref(proc, tr->target.handle);
1367                         if (ref == NULL) {
1368                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1369                                         proc->pid, thread->pid);
1370                                 return_error = BR_FAILED_REPLY;
1371                                 goto err_invalid_target_handle;
1372                         }
1373                         target_node = ref->node;
1374                 } else {
1375                         target_node = binder_context_mgr_node;
1376                         if (target_node == NULL) {
1377                                 return_error = BR_DEAD_REPLY;
1378                                 goto err_no_context_mgr_node;
1379                         }
1380                 }
1381                 e->to_node = target_node->debug_id;
1382                 target_proc = target_node->proc;
1383                 if (target_proc == NULL) {
1384                         return_error = BR_DEAD_REPLY;
1385                         goto err_dead_binder;
1386                 }
1387                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1388                         struct binder_transaction *tmp;
1389                         tmp = thread->transaction_stack;
1390                         if (tmp->to_thread != thread) {
1391                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1392                                         proc->pid, thread->pid, tmp->debug_id,
1393                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1394                                         tmp->to_thread ?
1395                                         tmp->to_thread->pid : 0);
1396                                 return_error = BR_FAILED_REPLY;
1397                                 goto err_bad_call_stack;
1398                         }
1399                         while (tmp) {
1400                                 if (tmp->from && tmp->from->proc == target_proc)
1401                                         target_thread = tmp->from;
1402                                 tmp = tmp->from_parent;
1403                         }
1404                 }
1405         }
1406         if (target_thread) {
1407                 e->to_thread = target_thread->pid;
1408                 target_list = &target_thread->todo;
1409                 target_wait = &target_thread->wait;
1410         } else {
1411                 target_list = &target_proc->todo;
1412                 target_wait = &target_proc->wait;
1413         }
1414         e->to_proc = target_proc->pid;
1415
1416         /* TODO: reuse incoming transaction for reply */
1417         t = kzalloc(sizeof(*t), GFP_KERNEL);
1418         if (t == NULL) {
1419                 return_error = BR_FAILED_REPLY;
1420                 goto err_alloc_t_failed;
1421         }
1422         binder_stats_created(BINDER_STAT_TRANSACTION);
1423
1424         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1425         if (tcomplete == NULL) {
1426                 return_error = BR_FAILED_REPLY;
1427                 goto err_alloc_tcomplete_failed;
1428         }
1429         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1430
1431         t->debug_id = ++binder_last_id;
1432         e->debug_id = t->debug_id;
1433
1434         if (reply)
1435                 binder_debug(BINDER_DEBUG_TRANSACTION,
1436                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1437                              proc->pid, thread->pid, t->debug_id,
1438                              target_proc->pid, target_thread->pid,
1439                              (u64)tr->data.ptr.buffer,
1440                              (u64)tr->data.ptr.offsets,
1441                              (u64)tr->data_size, (u64)tr->offsets_size);
1442         else
1443                 binder_debug(BINDER_DEBUG_TRANSACTION,
1444                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1445                              proc->pid, thread->pid, t->debug_id,
1446                              target_proc->pid, target_node->debug_id,
1447                              (u64)tr->data.ptr.buffer,
1448                              (u64)tr->data.ptr.offsets,
1449                              (u64)tr->data_size, (u64)tr->offsets_size);
1450
1451         if (!reply && !(tr->flags & TF_ONE_WAY))
1452                 t->from = thread;
1453         else
1454                 t->from = NULL;
1455         t->sender_euid = proc->tsk->cred->euid;
1456         t->to_proc = target_proc;
1457         t->to_thread = target_thread;
1458         t->code = tr->code;
1459         t->flags = tr->flags;
1460         t->priority = task_nice(current);
1461
1462         trace_binder_transaction(reply, t, target_node);
1463
1464         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1465                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1466         if (t->buffer == NULL) {
1467                 return_error = BR_FAILED_REPLY;
1468                 goto err_binder_alloc_buf_failed;
1469         }
1470         t->buffer->allow_user_free = 0;
1471         t->buffer->debug_id = t->debug_id;
1472         t->buffer->transaction = t;
1473         t->buffer->target_node = target_node;
1474         trace_binder_transaction_alloc_buf(t->buffer);
1475         if (target_node)
1476                 binder_inc_node(target_node, 1, 0, NULL);
1477
1478         offp = (binder_size_t *)(t->buffer->data +
1479                                  ALIGN(tr->data_size, sizeof(void *)));
1480
1481         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1482                            tr->data.ptr.buffer, tr->data_size)) {
1483                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1484                                 proc->pid, thread->pid);
1485                 return_error = BR_FAILED_REPLY;
1486                 goto err_copy_data_failed;
1487         }
1488         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1489                            tr->data.ptr.offsets, tr->offsets_size)) {
1490                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1491                                 proc->pid, thread->pid);
1492                 return_error = BR_FAILED_REPLY;
1493                 goto err_copy_data_failed;
1494         }
1495         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1496                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1497                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1498                 return_error = BR_FAILED_REPLY;
1499                 goto err_bad_offset;
1500         }
1501         off_end = (void *)offp + tr->offsets_size;
1502         for (; offp < off_end; offp++) {
1503                 struct flat_binder_object *fp;
1504                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1505                     t->buffer->data_size < sizeof(*fp) ||
1506                     !IS_ALIGNED(*offp, sizeof(u32))) {
1507                         binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
1508                                           proc->pid, thread->pid, (u64)*offp);
1509                         return_error = BR_FAILED_REPLY;
1510                         goto err_bad_offset;
1511                 }
1512                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1513                 switch (fp->type) {
1514                 case BINDER_TYPE_BINDER:
1515                 case BINDER_TYPE_WEAK_BINDER: {
1516                         struct binder_ref *ref;
1517                         struct binder_node *node = binder_get_node(proc, fp->binder);
1518                         if (node == NULL) {
1519                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1520                                 if (node == NULL) {
1521                                         return_error = BR_FAILED_REPLY;
1522                                         goto err_binder_new_node_failed;
1523                                 }
1524                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1525                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1526                         }
1527                         if (fp->cookie != node->cookie) {
1528                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1529                                         proc->pid, thread->pid,
1530                                         (u64)fp->binder, node->debug_id,
1531                                         (u64)fp->cookie, (u64)node->cookie);
1532                                 goto err_binder_get_ref_for_node_failed;
1533                         }
1534                         ref = binder_get_ref_for_node(target_proc, node);
1535                         if (ref == NULL) {
1536                                 return_error = BR_FAILED_REPLY;
1537                                 goto err_binder_get_ref_for_node_failed;
1538                         }
1539                         if (fp->type == BINDER_TYPE_BINDER)
1540                                 fp->type = BINDER_TYPE_HANDLE;
1541                         else
1542                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1543                         fp->handle = ref->desc;
1544                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1545                                        &thread->todo);
1546
1547                         trace_binder_transaction_node_to_ref(t, node, ref);
1548                         binder_debug(BINDER_DEBUG_TRANSACTION,
1549                                      "        node %d u%016llx -> ref %d desc %d\n",
1550                                      node->debug_id, (u64)node->ptr,
1551                                      ref->debug_id, ref->desc);
1552                 } break;
1553                 case BINDER_TYPE_HANDLE:
1554                 case BINDER_TYPE_WEAK_HANDLE: {
1555                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1556                         if (ref == NULL) {
1557                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1558                                                 proc->pid,
1559                                                 thread->pid, fp->handle);
1560                                 return_error = BR_FAILED_REPLY;
1561                                 goto err_binder_get_ref_failed;
1562                         }
1563                         if (ref->node->proc == target_proc) {
1564                                 if (fp->type == BINDER_TYPE_HANDLE)
1565                                         fp->type = BINDER_TYPE_BINDER;
1566                                 else
1567                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1568                                 fp->binder = ref->node->ptr;
1569                                 fp->cookie = ref->node->cookie;
1570                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1571                                 trace_binder_transaction_ref_to_node(t, ref);
1572                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1573                                              "        ref %d desc %d -> node %d u%016llx\n",
1574                                              ref->debug_id, ref->desc, ref->node->debug_id,
1575                                              (u64)ref->node->ptr);
1576                         } else {
1577                                 struct binder_ref *new_ref;
1578                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1579                                 if (new_ref == NULL) {
1580                                         return_error = BR_FAILED_REPLY;
1581                                         goto err_binder_get_ref_for_node_failed;
1582                                 }
1583                                 fp->handle = new_ref->desc;
1584                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1585                                 trace_binder_transaction_ref_to_ref(t, ref,
1586                                                                     new_ref);
1587                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1588                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1589                                              ref->debug_id, ref->desc, new_ref->debug_id,
1590                                              new_ref->desc, ref->node->debug_id);
1591                         }
1592                 } break;
1593
1594                 case BINDER_TYPE_FD: {
1595                         int target_fd;
1596                         struct file *file;
1597
1598                         if (reply) {
1599                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1600                                         binder_user_error("%d:%d got reply 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                         } else if (!target_node->accept_fds) {
1606                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1607                                         proc->pid, thread->pid, fp->handle);
1608                                 return_error = BR_FAILED_REPLY;
1609                                 goto err_fd_not_allowed;
1610                         }
1611
1612                         file = fget(fp->handle);
1613                         if (file == NULL) {
1614                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1615                                         proc->pid, thread->pid, fp->handle);
1616                                 return_error = BR_FAILED_REPLY;
1617                                 goto err_fget_failed;
1618                         }
1619                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1620                         if (target_fd < 0) {
1621                                 fput(file);
1622                                 return_error = BR_FAILED_REPLY;
1623                                 goto err_get_unused_fd_failed;
1624                         }
1625                         task_fd_install(target_proc, target_fd, file);
1626                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1627                         binder_debug(BINDER_DEBUG_TRANSACTION,
1628                                      "        fd %d -> %d\n", fp->handle, target_fd);
1629                         /* TODO: fput? */
1630                         fp->handle = target_fd;
1631                 } break;
1632
1633                 default:
1634                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1635                                 proc->pid, thread->pid, fp->type);
1636                         return_error = BR_FAILED_REPLY;
1637                         goto err_bad_object_type;
1638                 }
1639         }
1640         if (reply) {
1641                 BUG_ON(t->buffer->async_transaction != 0);
1642                 binder_pop_transaction(target_thread, in_reply_to);
1643         } else if (!(t->flags & TF_ONE_WAY)) {
1644                 BUG_ON(t->buffer->async_transaction != 0);
1645                 t->need_reply = 1;
1646                 t->from_parent = thread->transaction_stack;
1647                 thread->transaction_stack = t;
1648         } else {
1649                 BUG_ON(target_node == NULL);
1650                 BUG_ON(t->buffer->async_transaction != 1);
1651                 if (target_node->has_async_transaction) {
1652                         target_list = &target_node->async_todo;
1653                         target_wait = NULL;
1654                 } else
1655                         target_node->has_async_transaction = 1;
1656         }
1657         t->work.type = BINDER_WORK_TRANSACTION;
1658         list_add_tail(&t->work.entry, target_list);
1659         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1660         list_add_tail(&tcomplete->entry, &thread->todo);
1661         if (target_wait)
1662                 wake_up_interruptible(target_wait);
1663         return;
1664
1665 err_get_unused_fd_failed:
1666 err_fget_failed:
1667 err_fd_not_allowed:
1668 err_binder_get_ref_for_node_failed:
1669 err_binder_get_ref_failed:
1670 err_binder_new_node_failed:
1671 err_bad_object_type:
1672 err_bad_offset:
1673 err_copy_data_failed:
1674         trace_binder_transaction_failed_buffer_release(t->buffer);
1675         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1676         t->buffer->transaction = NULL;
1677         binder_free_buf(target_proc, t->buffer);
1678 err_binder_alloc_buf_failed:
1679         kfree(tcomplete);
1680         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1681 err_alloc_tcomplete_failed:
1682         kfree(t);
1683         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1684 err_alloc_t_failed:
1685 err_bad_call_stack:
1686 err_empty_call_stack:
1687 err_dead_binder:
1688 err_invalid_target_handle:
1689 err_no_context_mgr_node:
1690         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1691                      "%d:%d transaction failed %d, size %lld-%lld\n",
1692                      proc->pid, thread->pid, return_error,
1693                      (u64)tr->data_size, (u64)tr->offsets_size);
1694
1695         {
1696                 struct binder_transaction_log_entry *fe;
1697                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1698                 *fe = *e;
1699         }
1700
1701         BUG_ON(thread->return_error != BR_OK);
1702         if (in_reply_to) {
1703                 thread->return_error = BR_TRANSACTION_COMPLETE;
1704                 binder_send_failed_reply(in_reply_to, return_error);
1705         } else
1706                 thread->return_error = return_error;
1707 }
1708
1709 static int binder_thread_write(struct binder_proc *proc,
1710                         struct binder_thread *thread,
1711                         binder_uintptr_t binder_buffer, size_t size,
1712                         binder_size_t *consumed)
1713 {
1714         uint32_t cmd;
1715         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1716         void __user *ptr = buffer + *consumed;
1717         void __user *end = buffer + size;
1718
1719         while (ptr < end && thread->return_error == BR_OK) {
1720                 if (get_user(cmd, (uint32_t __user *)ptr))
1721                         return -EFAULT;
1722                 ptr += sizeof(uint32_t);
1723                 trace_binder_command(cmd);
1724                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1725                         binder_stats.bc[_IOC_NR(cmd)]++;
1726                         proc->stats.bc[_IOC_NR(cmd)]++;
1727                         thread->stats.bc[_IOC_NR(cmd)]++;
1728                 }
1729                 switch (cmd) {
1730                 case BC_INCREFS:
1731                 case BC_ACQUIRE:
1732                 case BC_RELEASE:
1733                 case BC_DECREFS: {
1734                         uint32_t target;
1735                         struct binder_ref *ref;
1736                         const char *debug_string;
1737
1738                         if (get_user(target, (uint32_t __user *)ptr))
1739                                 return -EFAULT;
1740                         ptr += sizeof(uint32_t);
1741                         if (target == 0 && binder_context_mgr_node &&
1742                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1743                                 ref = binder_get_ref_for_node(proc,
1744                                                binder_context_mgr_node);
1745                                 if (ref->desc != target) {
1746                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1747                                                 proc->pid, thread->pid,
1748                                                 ref->desc);
1749                                 }
1750                         } else
1751                                 ref = binder_get_ref(proc, target);
1752                         if (ref == NULL) {
1753                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1754                                         proc->pid, thread->pid, target);
1755                                 break;
1756                         }
1757                         switch (cmd) {
1758                         case BC_INCREFS:
1759                                 debug_string = "IncRefs";
1760                                 binder_inc_ref(ref, 0, NULL);
1761                                 break;
1762                         case BC_ACQUIRE:
1763                                 debug_string = "Acquire";
1764                                 binder_inc_ref(ref, 1, NULL);
1765                                 break;
1766                         case BC_RELEASE:
1767                                 debug_string = "Release";
1768                                 binder_dec_ref(ref, 1);
1769                                 break;
1770                         case BC_DECREFS:
1771                         default:
1772                                 debug_string = "DecRefs";
1773                                 binder_dec_ref(ref, 0);
1774                                 break;
1775                         }
1776                         binder_debug(BINDER_DEBUG_USER_REFS,
1777                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1778                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1779                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1780                         break;
1781                 }
1782                 case BC_INCREFS_DONE:
1783                 case BC_ACQUIRE_DONE: {
1784                         binder_uintptr_t node_ptr;
1785                         binder_uintptr_t cookie;
1786                         struct binder_node *node;
1787
1788                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1789                                 return -EFAULT;
1790                         ptr += sizeof(binder_uintptr_t);
1791                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1792                                 return -EFAULT;
1793                         ptr += sizeof(binder_uintptr_t);
1794                         node = binder_get_node(proc, node_ptr);
1795                         if (node == NULL) {
1796                                 binder_user_error("%d:%d %s u%016llx no match\n",
1797                                         proc->pid, thread->pid,
1798                                         cmd == BC_INCREFS_DONE ?
1799                                         "BC_INCREFS_DONE" :
1800                                         "BC_ACQUIRE_DONE",
1801                                         (u64)node_ptr);
1802                                 break;
1803                         }
1804                         if (cookie != node->cookie) {
1805                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1806                                         proc->pid, thread->pid,
1807                                         cmd == BC_INCREFS_DONE ?
1808                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1809                                         (u64)node_ptr, node->debug_id,
1810                                         (u64)cookie, (u64)node->cookie);
1811                                 break;
1812                         }
1813                         if (cmd == BC_ACQUIRE_DONE) {
1814                                 if (node->pending_strong_ref == 0) {
1815                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1816                                                 proc->pid, thread->pid,
1817                                                 node->debug_id);
1818                                         break;
1819                                 }
1820                                 node->pending_strong_ref = 0;
1821                         } else {
1822                                 if (node->pending_weak_ref == 0) {
1823                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1824                                                 proc->pid, thread->pid,
1825                                                 node->debug_id);
1826                                         break;
1827                                 }
1828                                 node->pending_weak_ref = 0;
1829                         }
1830                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1831                         binder_debug(BINDER_DEBUG_USER_REFS,
1832                                      "%d:%d %s node %d ls %d lw %d\n",
1833                                      proc->pid, thread->pid,
1834                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1835                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1836                         break;
1837                 }
1838                 case BC_ATTEMPT_ACQUIRE:
1839                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1840                         return -EINVAL;
1841                 case BC_ACQUIRE_RESULT:
1842                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1843                         return -EINVAL;
1844
1845                 case BC_FREE_BUFFER: {
1846                         binder_uintptr_t data_ptr;
1847                         struct binder_buffer *buffer;
1848
1849                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1850                                 return -EFAULT;
1851                         ptr += sizeof(binder_uintptr_t);
1852
1853                         buffer = binder_buffer_lookup(proc, data_ptr);
1854                         if (buffer == NULL) {
1855                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1856                                         proc->pid, thread->pid, (u64)data_ptr);
1857                                 break;
1858                         }
1859                         if (!buffer->allow_user_free) {
1860                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1861                                         proc->pid, thread->pid, (u64)data_ptr);
1862                                 break;
1863                         }
1864                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1865                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1866                                      proc->pid, thread->pid, (u64)data_ptr,
1867                                      buffer->debug_id,
1868                                      buffer->transaction ? "active" : "finished");
1869
1870                         if (buffer->transaction) {
1871                                 buffer->transaction->buffer = NULL;
1872                                 buffer->transaction = NULL;
1873                         }
1874                         if (buffer->async_transaction && buffer->target_node) {
1875                                 BUG_ON(!buffer->target_node->has_async_transaction);
1876                                 if (list_empty(&buffer->target_node->async_todo))
1877                                         buffer->target_node->has_async_transaction = 0;
1878                                 else
1879                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1880                         }
1881                         trace_binder_transaction_buffer_release(buffer);
1882                         binder_transaction_buffer_release(proc, buffer, NULL);
1883                         binder_free_buf(proc, buffer);
1884                         break;
1885                 }
1886
1887                 case BC_TRANSACTION:
1888                 case BC_REPLY: {
1889                         struct binder_transaction_data tr;
1890
1891                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1892                                 return -EFAULT;
1893                         ptr += sizeof(tr);
1894                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1895                         break;
1896                 }
1897
1898                 case BC_REGISTER_LOOPER:
1899                         binder_debug(BINDER_DEBUG_THREADS,
1900                                      "%d:%d BC_REGISTER_LOOPER\n",
1901                                      proc->pid, thread->pid);
1902                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1903                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1904                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1905                                         proc->pid, thread->pid);
1906                         } else if (proc->requested_threads == 0) {
1907                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1908                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1909                                         proc->pid, thread->pid);
1910                         } else {
1911                                 proc->requested_threads--;
1912                                 proc->requested_threads_started++;
1913                         }
1914                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1915                         break;
1916                 case BC_ENTER_LOOPER:
1917                         binder_debug(BINDER_DEBUG_THREADS,
1918                                      "%d:%d BC_ENTER_LOOPER\n",
1919                                      proc->pid, thread->pid);
1920                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1921                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1922                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1923                                         proc->pid, thread->pid);
1924                         }
1925                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1926                         break;
1927                 case BC_EXIT_LOOPER:
1928                         binder_debug(BINDER_DEBUG_THREADS,
1929                                      "%d:%d BC_EXIT_LOOPER\n",
1930                                      proc->pid, thread->pid);
1931                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1932                         break;
1933
1934                 case BC_REQUEST_DEATH_NOTIFICATION:
1935                 case BC_CLEAR_DEATH_NOTIFICATION: {
1936                         uint32_t target;
1937                         binder_uintptr_t cookie;
1938                         struct binder_ref *ref;
1939                         struct binder_ref_death *death;
1940
1941                         if (get_user(target, (uint32_t __user *)ptr))
1942                                 return -EFAULT;
1943                         ptr += sizeof(uint32_t);
1944                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1945                                 return -EFAULT;
1946                         ptr += sizeof(binder_uintptr_t);
1947                         ref = binder_get_ref(proc, target);
1948                         if (ref == NULL) {
1949                                 binder_user_error("%d:%d %s invalid ref %d\n",
1950                                         proc->pid, thread->pid,
1951                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1952                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1953                                         "BC_CLEAR_DEATH_NOTIFICATION",
1954                                         target);
1955                                 break;
1956                         }
1957
1958                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1959                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
1960                                      proc->pid, thread->pid,
1961                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1962                                      "BC_REQUEST_DEATH_NOTIFICATION" :
1963                                      "BC_CLEAR_DEATH_NOTIFICATION",
1964                                      (u64)cookie, ref->debug_id, ref->desc,
1965                                      ref->strong, ref->weak, ref->node->debug_id);
1966
1967                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1968                                 if (ref->death) {
1969                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
1970                                                 proc->pid, thread->pid);
1971                                         break;
1972                                 }
1973                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
1974                                 if (death == NULL) {
1975                                         thread->return_error = BR_ERROR;
1976                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1977                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
1978                                                      proc->pid, thread->pid);
1979                                         break;
1980                                 }
1981                                 binder_stats_created(BINDER_STAT_DEATH);
1982                                 INIT_LIST_HEAD(&death->work.entry);
1983                                 death->cookie = cookie;
1984                                 ref->death = death;
1985                                 if (ref->node->proc == NULL) {
1986                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
1987                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1988                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
1989                                         } else {
1990                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
1991                                                 wake_up_interruptible(&proc->wait);
1992                                         }
1993                                 }
1994                         } else {
1995                                 if (ref->death == NULL) {
1996                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
1997                                                 proc->pid, thread->pid);
1998                                         break;
1999                                 }
2000                                 death = ref->death;
2001                                 if (death->cookie != cookie) {
2002                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2003                                                 proc->pid, thread->pid,
2004                                                 (u64)death->cookie,
2005                                                 (u64)cookie);
2006                                         break;
2007                                 }
2008                                 ref->death = NULL;
2009                                 if (list_empty(&death->work.entry)) {
2010                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2011                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2012                                                 list_add_tail(&death->work.entry, &thread->todo);
2013                                         } else {
2014                                                 list_add_tail(&death->work.entry, &proc->todo);
2015                                                 wake_up_interruptible(&proc->wait);
2016                                         }
2017                                 } else {
2018                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2019                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2020                                 }
2021                         }
2022                 } break;
2023                 case BC_DEAD_BINDER_DONE: {
2024                         struct binder_work *w;
2025                         binder_uintptr_t cookie;
2026                         struct binder_ref_death *death = NULL;
2027                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2028                                 return -EFAULT;
2029
2030                         ptr += sizeof(void *);
2031                         list_for_each_entry(w, &proc->delivered_death, entry) {
2032                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2033                                 if (tmp_death->cookie == cookie) {
2034                                         death = tmp_death;
2035                                         break;
2036                                 }
2037                         }
2038                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2039                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2040                                      proc->pid, thread->pid, (u64)cookie,
2041                                      death);
2042                         if (death == NULL) {
2043                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2044                                         proc->pid, thread->pid, (u64)cookie);
2045                                 break;
2046                         }
2047
2048                         list_del_init(&death->work.entry);
2049                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2050                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2051                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2052                                         list_add_tail(&death->work.entry, &thread->todo);
2053                                 } else {
2054                                         list_add_tail(&death->work.entry, &proc->todo);
2055                                         wake_up_interruptible(&proc->wait);
2056                                 }
2057                         }
2058                 } break;
2059
2060                 default:
2061                         pr_err("%d:%d unknown command %d\n",
2062                                proc->pid, thread->pid, cmd);
2063                         return -EINVAL;
2064                 }
2065                 *consumed = ptr - buffer;
2066         }
2067         return 0;
2068 }
2069
2070 static void binder_stat_br(struct binder_proc *proc,
2071                            struct binder_thread *thread, uint32_t cmd)
2072 {
2073         trace_binder_return(cmd);
2074         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2075                 binder_stats.br[_IOC_NR(cmd)]++;
2076                 proc->stats.br[_IOC_NR(cmd)]++;
2077                 thread->stats.br[_IOC_NR(cmd)]++;
2078         }
2079 }
2080
2081 static int binder_has_proc_work(struct binder_proc *proc,
2082                                 struct binder_thread *thread)
2083 {
2084         return !list_empty(&proc->todo) ||
2085                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2086 }
2087
2088 static int binder_has_thread_work(struct binder_thread *thread)
2089 {
2090         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2091                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2092 }
2093
2094 static int binder_thread_read(struct binder_proc *proc,
2095                               struct binder_thread *thread,
2096                               binder_uintptr_t binder_buffer, size_t size,
2097                               binder_size_t *consumed, int non_block)
2098 {
2099         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2100         void __user *ptr = buffer + *consumed;
2101         void __user *end = buffer + size;
2102
2103         int ret = 0;
2104         int wait_for_proc_work;
2105
2106         if (*consumed == 0) {
2107                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2108                         return -EFAULT;
2109                 ptr += sizeof(uint32_t);
2110         }
2111
2112 retry:
2113         wait_for_proc_work = thread->transaction_stack == NULL &&
2114                                 list_empty(&thread->todo);
2115
2116         if (thread->return_error != BR_OK && ptr < end) {
2117                 if (thread->return_error2 != BR_OK) {
2118                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2119                                 return -EFAULT;
2120                         ptr += sizeof(uint32_t);
2121                         binder_stat_br(proc, thread, thread->return_error2);
2122                         if (ptr == end)
2123                                 goto done;
2124                         thread->return_error2 = BR_OK;
2125                 }
2126                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2127                         return -EFAULT;
2128                 ptr += sizeof(uint32_t);
2129                 binder_stat_br(proc, thread, thread->return_error);
2130                 thread->return_error = BR_OK;
2131                 goto done;
2132         }
2133
2134
2135         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2136         if (wait_for_proc_work)
2137                 proc->ready_threads++;
2138
2139         binder_unlock(__func__);
2140
2141         trace_binder_wait_for_work(wait_for_proc_work,
2142                                    !!thread->transaction_stack,
2143                                    !list_empty(&thread->todo));
2144         if (wait_for_proc_work) {
2145                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2146                                         BINDER_LOOPER_STATE_ENTERED))) {
2147                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2148                                 proc->pid, thread->pid, thread->looper);
2149                         wait_event_interruptible(binder_user_error_wait,
2150                                                  binder_stop_on_user_error < 2);
2151                 }
2152                 binder_set_nice(proc->default_priority);
2153                 if (non_block) {
2154                         if (!binder_has_proc_work(proc, thread))
2155                                 ret = -EAGAIN;
2156                 } else
2157                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2158         } else {
2159                 if (non_block) {
2160                         if (!binder_has_thread_work(thread))
2161                                 ret = -EAGAIN;
2162                 } else
2163                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2164         }
2165
2166         binder_lock(__func__);
2167
2168         if (wait_for_proc_work)
2169                 proc->ready_threads--;
2170         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2171
2172         if (ret)
2173                 return ret;
2174
2175         while (1) {
2176                 uint32_t cmd;
2177                 struct binder_transaction_data tr;
2178                 struct binder_work *w;
2179                 struct binder_transaction *t = NULL;
2180
2181                 if (!list_empty(&thread->todo))
2182                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2183                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2184                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2185                 else {
2186                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2187                                 goto retry;
2188                         break;
2189                 }
2190
2191                 if (end - ptr < sizeof(tr) + 4)
2192                         break;
2193
2194                 switch (w->type) {
2195                 case BINDER_WORK_TRANSACTION: {
2196                         t = container_of(w, struct binder_transaction, work);
2197                 } break;
2198                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2199                         cmd = BR_TRANSACTION_COMPLETE;
2200                         if (put_user(cmd, (uint32_t __user *)ptr))
2201                                 return -EFAULT;
2202                         ptr += sizeof(uint32_t);
2203
2204                         binder_stat_br(proc, thread, cmd);
2205                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2206                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2207                                      proc->pid, thread->pid);
2208
2209                         list_del(&w->entry);
2210                         kfree(w);
2211                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2212                 } break;
2213                 case BINDER_WORK_NODE: {
2214                         struct binder_node *node = container_of(w, struct binder_node, work);
2215                         uint32_t cmd = BR_NOOP;
2216                         const char *cmd_name;
2217                         int strong = node->internal_strong_refs || node->local_strong_refs;
2218                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2219                         if (weak && !node->has_weak_ref) {
2220                                 cmd = BR_INCREFS;
2221                                 cmd_name = "BR_INCREFS";
2222                                 node->has_weak_ref = 1;
2223                                 node->pending_weak_ref = 1;
2224                                 node->local_weak_refs++;
2225                         } else if (strong && !node->has_strong_ref) {
2226                                 cmd = BR_ACQUIRE;
2227                                 cmd_name = "BR_ACQUIRE";
2228                                 node->has_strong_ref = 1;
2229                                 node->pending_strong_ref = 1;
2230                                 node->local_strong_refs++;
2231                         } else if (!strong && node->has_strong_ref) {
2232                                 cmd = BR_RELEASE;
2233                                 cmd_name = "BR_RELEASE";
2234                                 node->has_strong_ref = 0;
2235                         } else if (!weak && node->has_weak_ref) {
2236                                 cmd = BR_DECREFS;
2237                                 cmd_name = "BR_DECREFS";
2238                                 node->has_weak_ref = 0;
2239                         }
2240                         if (cmd != BR_NOOP) {
2241                                 if (put_user(cmd, (uint32_t __user *)ptr))
2242                                         return -EFAULT;
2243                                 ptr += sizeof(uint32_t);
2244                                 if (put_user(node->ptr,
2245                                              (binder_uintptr_t __user *)ptr))
2246                                         return -EFAULT;
2247                                 ptr += sizeof(binder_uintptr_t);
2248                                 if (put_user(node->cookie,
2249                                              (binder_uintptr_t __user *)ptr))
2250                                         return -EFAULT;
2251                                 ptr += sizeof(binder_uintptr_t);
2252
2253                                 binder_stat_br(proc, thread, cmd);
2254                                 binder_debug(BINDER_DEBUG_USER_REFS,
2255                                              "%d:%d %s %d u%016llx c%016llx\n",
2256                                              proc->pid, thread->pid, cmd_name,
2257                                              node->debug_id,
2258                                              (u64)node->ptr, (u64)node->cookie);
2259                         } else {
2260                                 list_del_init(&w->entry);
2261                                 if (!weak && !strong) {
2262                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2263                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2264                                                      proc->pid, thread->pid,
2265                                                      node->debug_id,
2266                                                      (u64)node->ptr,
2267                                                      (u64)node->cookie);
2268                                         rb_erase(&node->rb_node, &proc->nodes);
2269                                         kfree(node);
2270                                         binder_stats_deleted(BINDER_STAT_NODE);
2271                                 } else {
2272                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2273                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2274                                                      proc->pid, thread->pid,
2275                                                      node->debug_id,
2276                                                      (u64)node->ptr,
2277                                                      (u64)node->cookie);
2278                                 }
2279                         }
2280                 } break;
2281                 case BINDER_WORK_DEAD_BINDER:
2282                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2283                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2284                         struct binder_ref_death *death;
2285                         uint32_t cmd;
2286
2287                         death = container_of(w, struct binder_ref_death, work);
2288                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2289                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2290                         else
2291                                 cmd = BR_DEAD_BINDER;
2292                         if (put_user(cmd, (uint32_t __user *)ptr))
2293                                 return -EFAULT;
2294                         ptr += sizeof(uint32_t);
2295                         if (put_user(death->cookie,
2296                                      (binder_uintptr_t __user *)ptr))
2297                                 return -EFAULT;
2298                         ptr += sizeof(binder_uintptr_t);
2299                         binder_stat_br(proc, thread, cmd);
2300                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2301                                      "%d:%d %s %016llx\n",
2302                                       proc->pid, thread->pid,
2303                                       cmd == BR_DEAD_BINDER ?
2304                                       "BR_DEAD_BINDER" :
2305                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2306                                       (u64)death->cookie);
2307
2308                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2309                                 list_del(&w->entry);
2310                                 kfree(death);
2311                                 binder_stats_deleted(BINDER_STAT_DEATH);
2312                         } else
2313                                 list_move(&w->entry, &proc->delivered_death);
2314                         if (cmd == BR_DEAD_BINDER)
2315                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2316                 } break;
2317                 }
2318
2319                 if (!t)
2320                         continue;
2321
2322                 BUG_ON(t->buffer == NULL);
2323                 if (t->buffer->target_node) {
2324                         struct binder_node *target_node = t->buffer->target_node;
2325                         tr.target.ptr = target_node->ptr;
2326                         tr.cookie =  target_node->cookie;
2327                         t->saved_priority = task_nice(current);
2328                         if (t->priority < target_node->min_priority &&
2329                             !(t->flags & TF_ONE_WAY))
2330                                 binder_set_nice(t->priority);
2331                         else if (!(t->flags & TF_ONE_WAY) ||
2332                                  t->saved_priority > target_node->min_priority)
2333                                 binder_set_nice(target_node->min_priority);
2334                         cmd = BR_TRANSACTION;
2335                 } else {
2336                         tr.target.ptr = 0;
2337                         tr.cookie = 0;
2338                         cmd = BR_REPLY;
2339                 }
2340                 tr.code = t->code;
2341                 tr.flags = t->flags;
2342                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2343
2344                 if (t->from) {
2345                         struct task_struct *sender = t->from->proc->tsk;
2346                         tr.sender_pid = task_tgid_nr_ns(sender,
2347                                                         task_active_pid_ns(current));
2348                 } else {
2349                         tr.sender_pid = 0;
2350                 }
2351
2352                 tr.data_size = t->buffer->data_size;
2353                 tr.offsets_size = t->buffer->offsets_size;
2354                 tr.data.ptr.buffer = (binder_uintptr_t)(
2355                                         (uintptr_t)t->buffer->data +
2356                                         proc->user_buffer_offset);
2357                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2358                                         ALIGN(t->buffer->data_size,
2359                                             sizeof(void *));
2360
2361                 if (put_user(cmd, (uint32_t __user *)ptr))
2362                         return -EFAULT;
2363                 ptr += sizeof(uint32_t);
2364                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2365                         return -EFAULT;
2366                 ptr += sizeof(tr);
2367
2368                 trace_binder_transaction_received(t);
2369                 binder_stat_br(proc, thread, cmd);
2370                 binder_debug(BINDER_DEBUG_TRANSACTION,
2371                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2372                              proc->pid, thread->pid,
2373                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2374                              "BR_REPLY",
2375                              t->debug_id, t->from ? t->from->proc->pid : 0,
2376                              t->from ? t->from->pid : 0, cmd,
2377                              t->buffer->data_size, t->buffer->offsets_size,
2378                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2379
2380                 list_del(&t->work.entry);
2381                 t->buffer->allow_user_free = 1;
2382                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2383                         t->to_parent = thread->transaction_stack;
2384                         t->to_thread = thread;
2385                         thread->transaction_stack = t;
2386                 } else {
2387                         t->buffer->transaction = NULL;
2388                         kfree(t);
2389                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2390                 }
2391                 break;
2392         }
2393
2394 done:
2395
2396         *consumed = ptr - buffer;
2397         if (proc->requested_threads + proc->ready_threads == 0 &&
2398             proc->requested_threads_started < proc->max_threads &&
2399             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2400              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2401              /*spawn a new thread if we leave this out */) {
2402                 proc->requested_threads++;
2403                 binder_debug(BINDER_DEBUG_THREADS,
2404                              "%d:%d BR_SPAWN_LOOPER\n",
2405                              proc->pid, thread->pid);
2406                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2407                         return -EFAULT;
2408                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2409         }
2410         return 0;
2411 }
2412
2413 static void binder_release_work(struct list_head *list)
2414 {
2415         struct binder_work *w;
2416         while (!list_empty(list)) {
2417                 w = list_first_entry(list, struct binder_work, entry);
2418                 list_del_init(&w->entry);
2419                 switch (w->type) {
2420                 case BINDER_WORK_TRANSACTION: {
2421                         struct binder_transaction *t;
2422
2423                         t = container_of(w, struct binder_transaction, work);
2424                         if (t->buffer->target_node &&
2425                             !(t->flags & TF_ONE_WAY)) {
2426                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2427                         } else {
2428                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2429                                         "undelivered transaction %d\n",
2430                                         t->debug_id);
2431                                 t->buffer->transaction = NULL;
2432                                 kfree(t);
2433                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2434                         }
2435                 } break;
2436                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2437                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2438                                 "undelivered TRANSACTION_COMPLETE\n");
2439                         kfree(w);
2440                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2441                 } break;
2442                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2443                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2444                         struct binder_ref_death *death;
2445
2446                         death = container_of(w, struct binder_ref_death, work);
2447                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2448                                 "undelivered death notification, %016llx\n",
2449                                 (u64)death->cookie);
2450                         kfree(death);
2451                         binder_stats_deleted(BINDER_STAT_DEATH);
2452                 } break;
2453                 default:
2454                         pr_err("unexpected work type, %d, not freed\n",
2455                                w->type);
2456                         break;
2457                 }
2458         }
2459
2460 }
2461
2462 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2463 {
2464         struct binder_thread *thread = NULL;
2465         struct rb_node *parent = NULL;
2466         struct rb_node **p = &proc->threads.rb_node;
2467
2468         while (*p) {
2469                 parent = *p;
2470                 thread = rb_entry(parent, struct binder_thread, rb_node);
2471
2472                 if (current->pid < thread->pid)
2473                         p = &(*p)->rb_left;
2474                 else if (current->pid > thread->pid)
2475                         p = &(*p)->rb_right;
2476                 else
2477                         break;
2478         }
2479         if (*p == NULL) {
2480                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2481                 if (thread == NULL)
2482                         return NULL;
2483                 binder_stats_created(BINDER_STAT_THREAD);
2484                 thread->proc = proc;
2485                 thread->pid = current->pid;
2486                 init_waitqueue_head(&thread->wait);
2487                 INIT_LIST_HEAD(&thread->todo);
2488                 rb_link_node(&thread->rb_node, parent, p);
2489                 rb_insert_color(&thread->rb_node, &proc->threads);
2490                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2491                 thread->return_error = BR_OK;
2492                 thread->return_error2 = BR_OK;
2493         }
2494         return thread;
2495 }
2496
2497 static int binder_free_thread(struct binder_proc *proc,
2498                               struct binder_thread *thread)
2499 {
2500         struct binder_transaction *t;
2501         struct binder_transaction *send_reply = NULL;
2502         int active_transactions = 0;
2503
2504         rb_erase(&thread->rb_node, &proc->threads);
2505         t = thread->transaction_stack;
2506         if (t && t->to_thread == thread)
2507                 send_reply = t;
2508         while (t) {
2509                 active_transactions++;
2510                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2511                              "release %d:%d transaction %d %s, still active\n",
2512                               proc->pid, thread->pid,
2513                              t->debug_id,
2514                              (t->to_thread == thread) ? "in" : "out");
2515
2516                 if (t->to_thread == thread) {
2517                         t->to_proc = NULL;
2518                         t->to_thread = NULL;
2519                         if (t->buffer) {
2520                                 t->buffer->transaction = NULL;
2521                                 t->buffer = NULL;
2522                         }
2523                         t = t->to_parent;
2524                 } else if (t->from == thread) {
2525                         t->from = NULL;
2526                         t = t->from_parent;
2527                 } else
2528                         BUG();
2529         }
2530         if (send_reply)
2531                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2532         binder_release_work(&thread->todo);
2533         kfree(thread);
2534         binder_stats_deleted(BINDER_STAT_THREAD);
2535         return active_transactions;
2536 }
2537
2538 static unsigned int binder_poll(struct file *filp,
2539                                 struct poll_table_struct *wait)
2540 {
2541         struct binder_proc *proc = filp->private_data;
2542         struct binder_thread *thread = NULL;
2543         int wait_for_proc_work;
2544
2545         binder_lock(__func__);
2546
2547         thread = binder_get_thread(proc);
2548
2549         wait_for_proc_work = thread->transaction_stack == NULL &&
2550                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2551
2552         binder_unlock(__func__);
2553
2554         if (wait_for_proc_work) {
2555                 if (binder_has_proc_work(proc, thread))
2556                         return POLLIN;
2557                 poll_wait(filp, &proc->wait, wait);
2558                 if (binder_has_proc_work(proc, thread))
2559                         return POLLIN;
2560         } else {
2561                 if (binder_has_thread_work(thread))
2562                         return POLLIN;
2563                 poll_wait(filp, &thread->wait, wait);
2564                 if (binder_has_thread_work(thread))
2565                         return POLLIN;
2566         }
2567         return 0;
2568 }
2569
2570 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2571 {
2572         int ret;
2573         struct binder_proc *proc = filp->private_data;
2574         struct binder_thread *thread;
2575         unsigned int size = _IOC_SIZE(cmd);
2576         void __user *ubuf = (void __user *)arg;
2577
2578         /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2579
2580         trace_binder_ioctl(cmd, arg);
2581
2582         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2583         if (ret)
2584                 goto err_unlocked;
2585
2586         binder_lock(__func__);
2587         thread = binder_get_thread(proc);
2588         if (thread == NULL) {
2589                 ret = -ENOMEM;
2590                 goto err;
2591         }
2592
2593         switch (cmd) {
2594         case BINDER_WRITE_READ: {
2595                 struct binder_write_read bwr;
2596                 if (size != sizeof(struct binder_write_read)) {
2597                         ret = -EINVAL;
2598                         goto err;
2599                 }
2600                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2601                         ret = -EFAULT;
2602                         goto err;
2603                 }
2604                 binder_debug(BINDER_DEBUG_READ_WRITE,
2605                              "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2606                              proc->pid, thread->pid,
2607                              (u64)bwr.write_size, (u64)bwr.write_buffer,
2608                              (u64)bwr.read_size, (u64)bwr.read_buffer);
2609
2610                 if (bwr.write_size > 0) {
2611                         ret = binder_thread_write(proc, thread,
2612                                                   bwr.write_buffer,
2613                                                   bwr.write_size,
2614                                                   &bwr.write_consumed);
2615                         trace_binder_write_done(ret);
2616                         if (ret < 0) {
2617                                 bwr.read_consumed = 0;
2618                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2619                                         ret = -EFAULT;
2620                                 goto err;
2621                         }
2622                 }
2623                 if (bwr.read_size > 0) {
2624                         ret = binder_thread_read(proc, thread, bwr.read_buffer,
2625                                                  bwr.read_size,
2626                                                  &bwr.read_consumed,
2627                                                  filp->f_flags & O_NONBLOCK);
2628                         trace_binder_read_done(ret);
2629                         if (!list_empty(&proc->todo))
2630                                 wake_up_interruptible(&proc->wait);
2631                         if (ret < 0) {
2632                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2633                                         ret = -EFAULT;
2634                                 goto err;
2635                         }
2636                 }
2637                 binder_debug(BINDER_DEBUG_READ_WRITE,
2638                              "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2639                              proc->pid, thread->pid,
2640                              (u64)bwr.write_consumed, (u64)bwr.write_size,
2641                              (u64)bwr.read_consumed, (u64)bwr.read_size);
2642                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2643                         ret = -EFAULT;
2644                         goto err;
2645                 }
2646                 break;
2647         }
2648         case BINDER_SET_MAX_THREADS:
2649                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2650                         ret = -EINVAL;
2651                         goto err;
2652                 }
2653                 break;
2654         case BINDER_SET_CONTEXT_MGR:
2655                 if (binder_context_mgr_node != NULL) {
2656                         pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2657                         ret = -EBUSY;
2658                         goto err;
2659                 }
2660                 if (uid_valid(binder_context_mgr_uid)) {
2661                         if (!uid_eq(binder_context_mgr_uid, current->cred->euid)) {
2662                                 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2663                                        from_kuid(&init_user_ns, current->cred->euid),
2664                                        from_kuid(&init_user_ns, binder_context_mgr_uid));
2665                                 ret = -EPERM;
2666                                 goto err;
2667                         }
2668                 } else
2669                         binder_context_mgr_uid = current->cred->euid;
2670                 binder_context_mgr_node = binder_new_node(proc, 0, 0);
2671                 if (binder_context_mgr_node == NULL) {
2672                         ret = -ENOMEM;
2673                         goto err;
2674                 }
2675                 binder_context_mgr_node->local_weak_refs++;
2676                 binder_context_mgr_node->local_strong_refs++;
2677                 binder_context_mgr_node->has_strong_ref = 1;
2678                 binder_context_mgr_node->has_weak_ref = 1;
2679                 break;
2680         case BINDER_THREAD_EXIT:
2681                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2682                              proc->pid, thread->pid);
2683                 binder_free_thread(proc, thread);
2684                 thread = NULL;
2685                 break;
2686         case BINDER_VERSION:
2687                 if (size != sizeof(struct binder_version)) {
2688                         ret = -EINVAL;
2689                         goto err;
2690                 }
2691                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2692                         ret = -EINVAL;
2693                         goto err;
2694                 }
2695                 break;
2696         default:
2697                 ret = -EINVAL;
2698                 goto err;
2699         }
2700         ret = 0;
2701 err:
2702         if (thread)
2703                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2704         binder_unlock(__func__);
2705         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2706         if (ret && ret != -ERESTARTSYS)
2707                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2708 err_unlocked:
2709         trace_binder_ioctl_done(ret);
2710         return ret;
2711 }
2712
2713 static void binder_vma_open(struct vm_area_struct *vma)
2714 {
2715         struct binder_proc *proc = vma->vm_private_data;
2716         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2717                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2718                      proc->pid, vma->vm_start, vma->vm_end,
2719                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2720                      (unsigned long)pgprot_val(vma->vm_page_prot));
2721 }
2722
2723 static void binder_vma_close(struct vm_area_struct *vma)
2724 {
2725         struct binder_proc *proc = vma->vm_private_data;
2726         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2727                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2728                      proc->pid, vma->vm_start, vma->vm_end,
2729                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2730                      (unsigned long)pgprot_val(vma->vm_page_prot));
2731         proc->vma = NULL;
2732         proc->vma_vm_mm = NULL;
2733         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2734 }
2735
2736 static struct vm_operations_struct binder_vm_ops = {
2737         .open = binder_vma_open,
2738         .close = binder_vma_close,
2739 };
2740
2741 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2742 {
2743         int ret;
2744         struct vm_struct *area;
2745         struct binder_proc *proc = filp->private_data;
2746         const char *failure_string;
2747         struct binder_buffer *buffer;
2748
2749         if (proc->tsk != current)
2750                 return -EINVAL;
2751
2752         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2753                 vma->vm_end = vma->vm_start + SZ_4M;
2754
2755         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2756                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2757                      proc->pid, vma->vm_start, vma->vm_end,
2758                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2759                      (unsigned long)pgprot_val(vma->vm_page_prot));
2760
2761         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2762                 ret = -EPERM;
2763                 failure_string = "bad vm_flags";
2764                 goto err_bad_arg;
2765         }
2766         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2767
2768         mutex_lock(&binder_mmap_lock);
2769         if (proc->buffer) {
2770                 ret = -EBUSY;
2771                 failure_string = "already mapped";
2772                 goto err_already_mapped;
2773         }
2774
2775         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2776         if (area == NULL) {
2777                 ret = -ENOMEM;
2778                 failure_string = "get_vm_area";
2779                 goto err_get_vm_area_failed;
2780         }
2781         proc->buffer = area->addr;
2782         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2783         mutex_unlock(&binder_mmap_lock);
2784
2785 #ifdef CONFIG_CPU_CACHE_VIPT
2786         if (cache_is_vipt_aliasing()) {
2787                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2788                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2789                         vma->vm_start += PAGE_SIZE;
2790                 }
2791         }
2792 #endif
2793         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2794         if (proc->pages == NULL) {
2795                 ret = -ENOMEM;
2796                 failure_string = "alloc page array";
2797                 goto err_alloc_pages_failed;
2798         }
2799         proc->buffer_size = vma->vm_end - vma->vm_start;
2800
2801         vma->vm_ops = &binder_vm_ops;
2802         vma->vm_private_data = proc;
2803
2804         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2805                 ret = -ENOMEM;
2806                 failure_string = "alloc small buf";
2807                 goto err_alloc_small_buf_failed;
2808         }
2809         buffer = proc->buffer;
2810         INIT_LIST_HEAD(&proc->buffers);
2811         list_add(&buffer->entry, &proc->buffers);
2812         buffer->free = 1;
2813         binder_insert_free_buffer(proc, buffer);
2814         proc->free_async_space = proc->buffer_size / 2;
2815         barrier();
2816         proc->files = get_files_struct(current);
2817         proc->vma = vma;
2818         proc->vma_vm_mm = vma->vm_mm;
2819
2820         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2821                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2822         return 0;
2823
2824 err_alloc_small_buf_failed:
2825         kfree(proc->pages);
2826         proc->pages = NULL;
2827 err_alloc_pages_failed:
2828         mutex_lock(&binder_mmap_lock);
2829         vfree(proc->buffer);
2830         proc->buffer = NULL;
2831 err_get_vm_area_failed:
2832 err_already_mapped:
2833         mutex_unlock(&binder_mmap_lock);
2834 err_bad_arg:
2835         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2836                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2837         return ret;
2838 }
2839
2840 static int binder_open(struct inode *nodp, struct file *filp)
2841 {
2842         struct binder_proc *proc;
2843
2844         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2845                      current->group_leader->pid, current->pid);
2846
2847         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2848         if (proc == NULL)
2849                 return -ENOMEM;
2850         get_task_struct(current);
2851         proc->tsk = current;
2852         INIT_LIST_HEAD(&proc->todo);
2853         init_waitqueue_head(&proc->wait);
2854         proc->default_priority = task_nice(current);
2855
2856         binder_lock(__func__);
2857
2858         binder_stats_created(BINDER_STAT_PROC);
2859         hlist_add_head(&proc->proc_node, &binder_procs);
2860         proc->pid = current->group_leader->pid;
2861         INIT_LIST_HEAD(&proc->delivered_death);
2862         filp->private_data = proc;
2863
2864         binder_unlock(__func__);
2865
2866         if (binder_debugfs_dir_entry_proc) {
2867                 char strbuf[11];
2868                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2869                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2870                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2871         }
2872
2873         return 0;
2874 }
2875
2876 static int binder_flush(struct file *filp, fl_owner_t id)
2877 {
2878         struct binder_proc *proc = filp->private_data;
2879
2880         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2881
2882         return 0;
2883 }
2884
2885 static void binder_deferred_flush(struct binder_proc *proc)
2886 {
2887         struct rb_node *n;
2888         int wake_count = 0;
2889         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2890                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2891                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2892                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2893                         wake_up_interruptible(&thread->wait);
2894                         wake_count++;
2895                 }
2896         }
2897         wake_up_interruptible_all(&proc->wait);
2898
2899         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2900                      "binder_flush: %d woke %d threads\n", proc->pid,
2901                      wake_count);
2902 }
2903
2904 static int binder_release(struct inode *nodp, struct file *filp)
2905 {
2906         struct binder_proc *proc = filp->private_data;
2907         debugfs_remove(proc->debugfs_entry);
2908         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2909
2910         return 0;
2911 }
2912
2913 static int binder_node_release(struct binder_node *node, int refs)
2914 {
2915         struct binder_ref *ref;
2916         int death = 0;
2917
2918         list_del_init(&node->work.entry);
2919         binder_release_work(&node->async_todo);
2920
2921         if (hlist_empty(&node->refs)) {
2922                 kfree(node);
2923                 binder_stats_deleted(BINDER_STAT_NODE);
2924
2925                 return refs;
2926         }
2927
2928         node->proc = NULL;
2929         node->local_strong_refs = 0;
2930         node->local_weak_refs = 0;
2931         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2932
2933         hlist_for_each_entry(ref, &node->refs, node_entry) {
2934                 refs++;
2935
2936                 if (!ref->death)
2937                         continue;
2938
2939                 death++;
2940
2941                 if (list_empty(&ref->death->work.entry)) {
2942                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2943                         list_add_tail(&ref->death->work.entry,
2944                                       &ref->proc->todo);
2945                         wake_up_interruptible(&ref->proc->wait);
2946                 } else
2947                         BUG();
2948         }
2949
2950         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2951                      "node %d now dead, refs %d, death %d\n",
2952                      node->debug_id, refs, death);
2953
2954         return refs;
2955 }
2956
2957 static void binder_deferred_release(struct binder_proc *proc)
2958 {
2959         struct binder_transaction *t;
2960         struct rb_node *n;
2961         int threads, nodes, incoming_refs, outgoing_refs, buffers,
2962                 active_transactions, page_count;
2963
2964         BUG_ON(proc->vma);
2965         BUG_ON(proc->files);
2966
2967         hlist_del(&proc->proc_node);
2968
2969         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2970                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2971                              "%s: %d context_mgr_node gone\n",
2972                              __func__, proc->pid);
2973                 binder_context_mgr_node = NULL;
2974         }
2975
2976         threads = 0;
2977         active_transactions = 0;
2978         while ((n = rb_first(&proc->threads))) {
2979                 struct binder_thread *thread;
2980
2981                 thread = rb_entry(n, struct binder_thread, rb_node);
2982                 threads++;
2983                 active_transactions += binder_free_thread(proc, thread);
2984         }
2985
2986         nodes = 0;
2987         incoming_refs = 0;
2988         while ((n = rb_first(&proc->nodes))) {
2989                 struct binder_node *node;
2990
2991                 node = rb_entry(n, struct binder_node, rb_node);
2992                 nodes++;
2993                 rb_erase(&node->rb_node, &proc->nodes);
2994                 incoming_refs = binder_node_release(node, incoming_refs);
2995         }
2996
2997         outgoing_refs = 0;
2998         while ((n = rb_first(&proc->refs_by_desc))) {
2999                 struct binder_ref *ref;
3000
3001                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3002                 outgoing_refs++;
3003                 binder_delete_ref(ref);
3004         }
3005
3006         binder_release_work(&proc->todo);
3007         binder_release_work(&proc->delivered_death);
3008
3009         buffers = 0;
3010         while ((n = rb_first(&proc->allocated_buffers))) {
3011                 struct binder_buffer *buffer;
3012
3013                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3014
3015                 t = buffer->transaction;
3016                 if (t) {
3017                         t->buffer = NULL;
3018                         buffer->transaction = NULL;
3019                         pr_err("release proc %d, transaction %d, not freed\n",
3020                                proc->pid, t->debug_id);
3021                         /*BUG();*/
3022                 }
3023
3024                 binder_free_buf(proc, buffer);
3025                 buffers++;
3026         }
3027
3028         binder_stats_deleted(BINDER_STAT_PROC);
3029
3030         page_count = 0;
3031         if (proc->pages) {
3032                 int i;
3033
3034                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3035                         void *page_addr;
3036
3037                         if (!proc->pages[i])
3038                                 continue;
3039
3040                         page_addr = proc->buffer + i * PAGE_SIZE;
3041                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3042                                      "%s: %d: page %d at %p not freed\n",
3043                                      __func__, proc->pid, i, page_addr);
3044                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3045                         __free_page(proc->pages[i]);
3046                         page_count++;
3047                 }
3048                 kfree(proc->pages);
3049                 vfree(proc->buffer);
3050         }
3051
3052         put_task_struct(proc->tsk);
3053
3054         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3055                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3056                      __func__, proc->pid, threads, nodes, incoming_refs,
3057                      outgoing_refs, active_transactions, buffers, page_count);
3058
3059         kfree(proc);
3060 }
3061
3062 static void binder_deferred_func(struct work_struct *work)
3063 {
3064         struct binder_proc *proc;
3065         struct files_struct *files;
3066
3067         int defer;
3068         do {
3069                 binder_lock(__func__);
3070                 mutex_lock(&binder_deferred_lock);
3071                 if (!hlist_empty(&binder_deferred_list)) {
3072                         proc = hlist_entry(binder_deferred_list.first,
3073                                         struct binder_proc, deferred_work_node);
3074                         hlist_del_init(&proc->deferred_work_node);
3075                         defer = proc->deferred_work;
3076                         proc->deferred_work = 0;
3077                 } else {
3078                         proc = NULL;
3079                         defer = 0;
3080                 }
3081                 mutex_unlock(&binder_deferred_lock);
3082
3083                 files = NULL;
3084                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3085                         files = proc->files;
3086                         if (files)
3087                                 proc->files = NULL;
3088                 }
3089
3090                 if (defer & BINDER_DEFERRED_FLUSH)
3091                         binder_deferred_flush(proc);
3092
3093                 if (defer & BINDER_DEFERRED_RELEASE)
3094                         binder_deferred_release(proc); /* frees proc */
3095
3096                 binder_unlock(__func__);
3097                 if (files)
3098                         put_files_struct(files);
3099         } while (proc);
3100 }
3101 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3102
3103 static void
3104 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3105 {
3106         mutex_lock(&binder_deferred_lock);
3107         proc->deferred_work |= defer;
3108         if (hlist_unhashed(&proc->deferred_work_node)) {
3109                 hlist_add_head(&proc->deferred_work_node,
3110                                 &binder_deferred_list);
3111                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3112         }
3113         mutex_unlock(&binder_deferred_lock);
3114 }
3115
3116 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3117                                      struct binder_transaction *t)
3118 {
3119         seq_printf(m,
3120                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3121                    prefix, t->debug_id, t,
3122                    t->from ? t->from->proc->pid : 0,
3123                    t->from ? t->from->pid : 0,
3124                    t->to_proc ? t->to_proc->pid : 0,
3125                    t->to_thread ? t->to_thread->pid : 0,
3126                    t->code, t->flags, t->priority, t->need_reply);
3127         if (t->buffer == NULL) {
3128                 seq_puts(m, " buffer free\n");
3129                 return;
3130         }
3131         if (t->buffer->target_node)
3132                 seq_printf(m, " node %d",
3133                            t->buffer->target_node->debug_id);
3134         seq_printf(m, " size %zd:%zd data %p\n",
3135                    t->buffer->data_size, t->buffer->offsets_size,
3136                    t->buffer->data);
3137 }
3138
3139 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3140                                 struct binder_buffer *buffer)
3141 {
3142         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3143                    prefix, buffer->debug_id, buffer->data,
3144                    buffer->data_size, buffer->offsets_size,
3145                    buffer->transaction ? "active" : "delivered");
3146 }
3147
3148 static void print_binder_work(struct seq_file *m, const char *prefix,
3149                               const char *transaction_prefix,
3150                               struct binder_work *w)
3151 {
3152         struct binder_node *node;
3153         struct binder_transaction *t;
3154
3155         switch (w->type) {
3156         case BINDER_WORK_TRANSACTION:
3157                 t = container_of(w, struct binder_transaction, work);
3158                 print_binder_transaction(m, transaction_prefix, t);
3159                 break;
3160         case BINDER_WORK_TRANSACTION_COMPLETE:
3161                 seq_printf(m, "%stransaction complete\n", prefix);
3162                 break;
3163         case BINDER_WORK_NODE:
3164                 node = container_of(w, struct binder_node, work);
3165                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3166                            prefix, node->debug_id,
3167                            (u64)node->ptr, (u64)node->cookie);
3168                 break;
3169         case BINDER_WORK_DEAD_BINDER:
3170                 seq_printf(m, "%shas dead binder\n", prefix);
3171                 break;
3172         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3173                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3174                 break;
3175         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3176                 seq_printf(m, "%shas cleared death notification\n", prefix);
3177                 break;
3178         default:
3179                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3180                 break;
3181         }
3182 }
3183
3184 static void print_binder_thread(struct seq_file *m,
3185                                 struct binder_thread *thread,
3186                                 int print_always)
3187 {
3188         struct binder_transaction *t;
3189         struct binder_work *w;
3190         size_t start_pos = m->count;
3191         size_t header_pos;
3192
3193         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3194         header_pos = m->count;
3195         t = thread->transaction_stack;
3196         while (t) {
3197                 if (t->from == thread) {
3198                         print_binder_transaction(m,
3199                                                  "    outgoing transaction", t);
3200                         t = t->from_parent;
3201                 } else if (t->to_thread == thread) {
3202                         print_binder_transaction(m,
3203                                                  "    incoming transaction", t);
3204                         t = t->to_parent;
3205                 } else {
3206                         print_binder_transaction(m, "    bad transaction", t);
3207                         t = NULL;
3208                 }
3209         }
3210         list_for_each_entry(w, &thread->todo, entry) {
3211                 print_binder_work(m, "    ", "    pending transaction", w);
3212         }
3213         if (!print_always && m->count == header_pos)
3214                 m->count = start_pos;
3215 }
3216
3217 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3218 {
3219         struct binder_ref *ref;
3220         struct binder_work *w;
3221         int count;
3222
3223         count = 0;
3224         hlist_for_each_entry(ref, &node->refs, node_entry)
3225                 count++;
3226
3227         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3228                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3229                    node->has_strong_ref, node->has_weak_ref,
3230                    node->local_strong_refs, node->local_weak_refs,
3231                    node->internal_strong_refs, count);
3232         if (count) {
3233                 seq_puts(m, " proc");
3234                 hlist_for_each_entry(ref, &node->refs, node_entry)
3235                         seq_printf(m, " %d", ref->proc->pid);
3236         }
3237         seq_puts(m, "\n");
3238         list_for_each_entry(w, &node->async_todo, entry)
3239                 print_binder_work(m, "    ",
3240                                   "    pending async transaction", w);
3241 }
3242
3243 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3244 {
3245         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3246                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3247                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3248 }
3249
3250 static void print_binder_proc(struct seq_file *m,
3251                               struct binder_proc *proc, int print_all)
3252 {
3253         struct binder_work *w;
3254         struct rb_node *n;
3255         size_t start_pos = m->count;
3256         size_t header_pos;
3257
3258         seq_printf(m, "proc %d\n", proc->pid);
3259         header_pos = m->count;
3260
3261         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3262                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3263                                                 rb_node), print_all);
3264         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3265                 struct binder_node *node = rb_entry(n, struct binder_node,
3266                                                     rb_node);
3267                 if (print_all || node->has_async_transaction)
3268                         print_binder_node(m, node);
3269         }
3270         if (print_all) {
3271                 for (n = rb_first(&proc->refs_by_desc);
3272                      n != NULL;
3273                      n = rb_next(n))
3274                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3275                                                      rb_node_desc));
3276         }
3277         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3278                 print_binder_buffer(m, "  buffer",
3279                                     rb_entry(n, struct binder_buffer, rb_node));
3280         list_for_each_entry(w, &proc->todo, entry)
3281                 print_binder_work(m, "  ", "  pending transaction", w);
3282         list_for_each_entry(w, &proc->delivered_death, entry) {
3283                 seq_puts(m, "  has delivered dead binder\n");
3284                 break;
3285         }
3286         if (!print_all && m->count == header_pos)
3287                 m->count = start_pos;
3288 }
3289
3290 static const char * const binder_return_strings[] = {
3291         "BR_ERROR",
3292         "BR_OK",
3293         "BR_TRANSACTION",
3294         "BR_REPLY",
3295         "BR_ACQUIRE_RESULT",
3296         "BR_DEAD_REPLY",
3297         "BR_TRANSACTION_COMPLETE",
3298         "BR_INCREFS",
3299         "BR_ACQUIRE",
3300         "BR_RELEASE",
3301         "BR_DECREFS",
3302         "BR_ATTEMPT_ACQUIRE",
3303         "BR_NOOP",
3304         "BR_SPAWN_LOOPER",
3305         "BR_FINISHED",
3306         "BR_DEAD_BINDER",
3307         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3308         "BR_FAILED_REPLY"
3309 };
3310
3311 static const char * const binder_command_strings[] = {
3312         "BC_TRANSACTION",
3313         "BC_REPLY",
3314         "BC_ACQUIRE_RESULT",
3315         "BC_FREE_BUFFER",
3316         "BC_INCREFS",
3317         "BC_ACQUIRE",
3318         "BC_RELEASE",
3319         "BC_DECREFS",
3320         "BC_INCREFS_DONE",
3321         "BC_ACQUIRE_DONE",
3322         "BC_ATTEMPT_ACQUIRE",
3323         "BC_REGISTER_LOOPER",
3324         "BC_ENTER_LOOPER",
3325         "BC_EXIT_LOOPER",
3326         "BC_REQUEST_DEATH_NOTIFICATION",
3327         "BC_CLEAR_DEATH_NOTIFICATION",
3328         "BC_DEAD_BINDER_DONE"
3329 };
3330
3331 static const char * const binder_objstat_strings[] = {
3332         "proc",
3333         "thread",
3334         "node",
3335         "ref",
3336         "death",
3337         "transaction",
3338         "transaction_complete"
3339 };
3340
3341 static void print_binder_stats(struct seq_file *m, const char *prefix,
3342                                struct binder_stats *stats)
3343 {
3344         int i;
3345
3346         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3347                      ARRAY_SIZE(binder_command_strings));
3348         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3349                 if (stats->bc[i])
3350                         seq_printf(m, "%s%s: %d\n", prefix,
3351                                    binder_command_strings[i], stats->bc[i]);
3352         }
3353
3354         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3355                      ARRAY_SIZE(binder_return_strings));
3356         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3357                 if (stats->br[i])
3358                         seq_printf(m, "%s%s: %d\n", prefix,
3359                                    binder_return_strings[i], stats->br[i]);
3360         }
3361
3362         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3363                      ARRAY_SIZE(binder_objstat_strings));
3364         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3365                      ARRAY_SIZE(stats->obj_deleted));
3366         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3367                 if (stats->obj_created[i] || stats->obj_deleted[i])
3368                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3369                                 binder_objstat_strings[i],
3370                                 stats->obj_created[i] - stats->obj_deleted[i],
3371                                 stats->obj_created[i]);
3372         }
3373 }
3374
3375 static void print_binder_proc_stats(struct seq_file *m,
3376                                     struct binder_proc *proc)
3377 {
3378         struct binder_work *w;
3379         struct rb_node *n;
3380         int count, strong, weak;
3381
3382         seq_printf(m, "proc %d\n", proc->pid);
3383         count = 0;
3384         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3385                 count++;
3386         seq_printf(m, "  threads: %d\n", count);
3387         seq_printf(m, "  requested threads: %d+%d/%d\n"
3388                         "  ready threads %d\n"
3389                         "  free async space %zd\n", proc->requested_threads,
3390                         proc->requested_threads_started, proc->max_threads,
3391                         proc->ready_threads, proc->free_async_space);
3392         count = 0;
3393         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3394                 count++;
3395         seq_printf(m, "  nodes: %d\n", count);
3396         count = 0;
3397         strong = 0;
3398         weak = 0;
3399         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3400                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3401                                                   rb_node_desc);
3402                 count++;
3403                 strong += ref->strong;
3404                 weak += ref->weak;
3405         }
3406         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3407
3408         count = 0;
3409         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3410                 count++;
3411         seq_printf(m, "  buffers: %d\n", count);
3412
3413         count = 0;
3414         list_for_each_entry(w, &proc->todo, entry) {
3415                 switch (w->type) {
3416                 case BINDER_WORK_TRANSACTION:
3417                         count++;
3418                         break;
3419                 default:
3420                         break;
3421                 }
3422         }
3423         seq_printf(m, "  pending transactions: %d\n", count);
3424
3425         print_binder_stats(m, "  ", &proc->stats);
3426 }
3427
3428
3429 static int binder_state_show(struct seq_file *m, void *unused)
3430 {
3431         struct binder_proc *proc;
3432         struct binder_node *node;
3433         int do_lock = !binder_debug_no_lock;
3434
3435         if (do_lock)
3436                 binder_lock(__func__);
3437
3438         seq_puts(m, "binder state:\n");
3439
3440         if (!hlist_empty(&binder_dead_nodes))
3441                 seq_puts(m, "dead nodes:\n");
3442         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3443                 print_binder_node(m, node);
3444
3445         hlist_for_each_entry(proc, &binder_procs, proc_node)
3446                 print_binder_proc(m, proc, 1);
3447         if (do_lock)
3448                 binder_unlock(__func__);
3449         return 0;
3450 }
3451
3452 static int binder_stats_show(struct seq_file *m, void *unused)
3453 {
3454         struct binder_proc *proc;
3455         int do_lock = !binder_debug_no_lock;
3456
3457         if (do_lock)
3458                 binder_lock(__func__);
3459
3460         seq_puts(m, "binder stats:\n");
3461
3462         print_binder_stats(m, "", &binder_stats);
3463
3464         hlist_for_each_entry(proc, &binder_procs, proc_node)
3465                 print_binder_proc_stats(m, proc);
3466         if (do_lock)
3467                 binder_unlock(__func__);
3468         return 0;
3469 }
3470
3471 static int binder_transactions_show(struct seq_file *m, void *unused)
3472 {
3473         struct binder_proc *proc;
3474         int do_lock = !binder_debug_no_lock;
3475
3476         if (do_lock)
3477                 binder_lock(__func__);
3478
3479         seq_puts(m, "binder transactions:\n");
3480         hlist_for_each_entry(proc, &binder_procs, proc_node)
3481                 print_binder_proc(m, proc, 0);
3482         if (do_lock)
3483                 binder_unlock(__func__);
3484         return 0;
3485 }
3486
3487 static int binder_proc_show(struct seq_file *m, void *unused)
3488 {
3489         struct binder_proc *proc = m->private;
3490         int do_lock = !binder_debug_no_lock;
3491
3492         if (do_lock)
3493                 binder_lock(__func__);
3494         seq_puts(m, "binder proc state:\n");
3495         print_binder_proc(m, proc, 1);
3496         if (do_lock)
3497                 binder_unlock(__func__);
3498         return 0;
3499 }
3500
3501 static void print_binder_transaction_log_entry(struct seq_file *m,
3502                                         struct binder_transaction_log_entry *e)
3503 {
3504         seq_printf(m,
3505                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3506                    e->debug_id, (e->call_type == 2) ? "reply" :
3507                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3508                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3509                    e->target_handle, e->data_size, e->offsets_size);
3510 }
3511
3512 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3513 {
3514         struct binder_transaction_log *log = m->private;
3515         int i;
3516
3517         if (log->full) {
3518                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3519                         print_binder_transaction_log_entry(m, &log->entry[i]);
3520         }
3521         for (i = 0; i < log->next; i++)
3522                 print_binder_transaction_log_entry(m, &log->entry[i]);
3523         return 0;
3524 }
3525
3526 static const struct file_operations binder_fops = {
3527         .owner = THIS_MODULE,
3528         .poll = binder_poll,
3529         .unlocked_ioctl = binder_ioctl,
3530         .compat_ioctl = binder_ioctl,
3531         .mmap = binder_mmap,
3532         .open = binder_open,
3533         .flush = binder_flush,
3534         .release = binder_release,
3535 };
3536
3537 static struct miscdevice binder_miscdev = {
3538         .minor = MISC_DYNAMIC_MINOR,
3539         .name = "binder",
3540         .fops = &binder_fops
3541 };
3542
3543 BINDER_DEBUG_ENTRY(state);
3544 BINDER_DEBUG_ENTRY(stats);
3545 BINDER_DEBUG_ENTRY(transactions);
3546 BINDER_DEBUG_ENTRY(transaction_log);
3547
3548 static int __init binder_init(void)
3549 {
3550         int ret;
3551
3552         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3553         if (!binder_deferred_workqueue)
3554                 return -ENOMEM;
3555
3556         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3557         if (binder_debugfs_dir_entry_root)
3558                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3559                                                  binder_debugfs_dir_entry_root);
3560         ret = misc_register(&binder_miscdev);
3561         if (binder_debugfs_dir_entry_root) {
3562                 debugfs_create_file("state",
3563                                     S_IRUGO,
3564                                     binder_debugfs_dir_entry_root,
3565                                     NULL,
3566                                     &binder_state_fops);
3567                 debugfs_create_file("stats",
3568                                     S_IRUGO,
3569                                     binder_debugfs_dir_entry_root,
3570                                     NULL,
3571                                     &binder_stats_fops);
3572                 debugfs_create_file("transactions",
3573                                     S_IRUGO,
3574                                     binder_debugfs_dir_entry_root,
3575                                     NULL,
3576                                     &binder_transactions_fops);
3577                 debugfs_create_file("transaction_log",
3578                                     S_IRUGO,
3579                                     binder_debugfs_dir_entry_root,
3580                                     &binder_transaction_log,
3581                                     &binder_transaction_log_fops);
3582                 debugfs_create_file("failed_transaction_log",
3583                                     S_IRUGO,
3584                                     binder_debugfs_dir_entry_root,
3585                                     &binder_transaction_log_failed,
3586                                     &binder_transaction_log_fops);
3587         }
3588         return ret;
3589 }
3590
3591 device_initcall(binder_init);
3592
3593 #define CREATE_TRACE_POINTS
3594 #include "binder_trace.h"
3595
3596 MODULE_LICENSE("GPL v2");