drivers/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 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  42 #define BINDER_IPC_32BIT 1
  43 #endif
  44
  45 #include <uapi/linux/android/binder.h>
  46 #include "binder_trace.h"
  47
  48 static DEFINE_MUTEX(binder_main_lock);
  49 static DEFINE_MUTEX(binder_deferred_lock);
  50 static DEFINE_MUTEX(binder_mmap_lock);
  51
  52 static HLIST_HEAD(binder_procs);
  53 static HLIST_HEAD(binder_deferred_list);
  54 static HLIST_HEAD(binder_dead_nodes);
  55
  56 static struct dentry *binder_debugfs_dir_entry_root;
  57 static struct dentry *binder_debugfs_dir_entry_proc;
  58 static struct binder_node *binder_context_mgr_node;
  59 static kuid_t binder_context_mgr_uid = INVALID_UID;
  60 static int binder_last_id;
  61 static struct workqueue_struct *binder_deferred_workqueue;
  62
  63 #define BINDER_DEBUG_ENTRY(name) \
  64 static int binder_##name##_open(struct inode *inode, struct file *file) \
  65 { \
  66         return single_open(file, binder_##name##_show, inode->i_private); \
  67 } \
  68 \
  69 static const struct file_operations binder_##name##_fops = { \
  70         .owner = THIS_MODULE, \
  71         .open = binder_##name##_open, \
  72         .read = seq_read, \
  73         .llseek = seq_lseek, \
  74         .release = single_release, \
  75 }
  76
  77 static int binder_proc_show(struct seq_file *m, void *unused);
  78 BINDER_DEBUG_ENTRY(proc);
  79
  80 /* This is only defined in include/asm-arm/sizes.h */
  81 #ifndef SZ_1K
  82 #define SZ_1K                               0x400
  83 #endif
  84
  85 #ifndef SZ_4M
  86 #define SZ_4M                               0x400000
  87 #endif
  88
  89 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  90
  91 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  92
  93 enum {
  94         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  95         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  96         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  97         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  98         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  99         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 100         BINDER_DEBUG_READ_WRITE             = 1U << 6,
 101         BINDER_DEBUG_USER_REFS              = 1U << 7,
 102         BINDER_DEBUG_THREADS                = 1U << 8,
 103         BINDER_DEBUG_TRANSACTION            = 1U << 9,
 104         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 105         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 106         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 107         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 108         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 109         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 110 };
 111 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 112         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 113 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 114
 115 static bool binder_debug_no_lock;
 116 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 117
 118 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 119 static int binder_stop_on_user_error;
 120
 121 static int binder_set_stop_on_user_error(const char *val,
 122                                          struct kernel_param *kp)
 123 {
 124         int ret;
 125
 126         ret = param_set_int(val, kp);
 127         if (binder_stop_on_user_error < 2)
 128                 wake_up(&binder_user_error_wait);
 129         return ret;
 130 }
 131 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 132         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 133
 134 #define binder_debug(mask, x...) \
 135         do { \
 136                 if (binder_debug_mask & mask) \
 137                         pr_info(x); \
 138         } while (0)
 139
 140 #define binder_user_error(x...) \
 141         do { \
 142                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 143                         pr_info(x); \
 144                 if (binder_stop_on_user_error) \
 145                         binder_stop_on_user_error = 2; \
 146         } while (0)
 147
 148 enum binder_stat_types {
 149         BINDER_STAT_PROC,
 150         BINDER_STAT_THREAD,
 151         BINDER_STAT_NODE,
 152         BINDER_STAT_REF,
 153         BINDER_STAT_DEATH,
 154         BINDER_STAT_TRANSACTION,
 155         BINDER_STAT_TRANSACTION_COMPLETE,
 156         BINDER_STAT_COUNT
 157 };
 158
 159 struct binder_stats {
 160         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 161         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 162         int obj_created[BINDER_STAT_COUNT];
 163         int obj_deleted[BINDER_STAT_COUNT];
 164 };
 165
 166 static struct binder_stats binder_stats;
 167
 168 static inline void binder_stats_deleted(enum binder_stat_types type)
 169 {
 170         binder_stats.obj_deleted[type]++;
 171 }
 172
 173 static inline void binder_stats_created(enum binder_stat_types type)
 174 {
 175         binder_stats.obj_created[type]++;
 176 }
 177
 178 struct binder_transaction_log_entry {
 179         int debug_id;
 180         int call_type;
 181         int from_proc;
 182         int from_thread;
 183         int target_handle;
 184         int to_proc;
 185         int to_thread;
 186         int to_node;
 187         int data_size;
 188         int offsets_size;
 189 };
 190 struct binder_transaction_log {
 191         int next;
 192         int full;
 193         struct binder_transaction_log_entry entry[32];
 194 };
 195 static struct binder_transaction_log binder_transaction_log;
 196 static struct binder_transaction_log binder_transaction_log_failed;
 197
 198 static struct binder_transaction_log_entry *binder_transaction_log_add(
 199         struct binder_transaction_log *log)
 200 {
 201         struct binder_transaction_log_entry *e;
 202
 203         e = &log->entry[log->next];
 204         memset(e, 0, sizeof(*e));
 205         log->next++;
 206         if (log->next == ARRAY_SIZE(log->entry)) {
 207                 log->next = 0;
 208                 log->full = 1;
 209         }
 210         return e;
 211 }
 212
 213 struct binder_work {
 214         struct list_head entry;
 215         enum {
 216                 BINDER_WORK_TRANSACTION = 1,
 217                 BINDER_WORK_TRANSACTION_COMPLETE,
 218                 BINDER_WORK_NODE,
 219                 BINDER_WORK_DEAD_BINDER,
 220                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 221                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 222         } type;
 223 };
 224
 225 struct binder_node {
 226         int debug_id;
 227         struct binder_work work;
 228         union {
 229                 struct rb_node rb_node;
 230                 struct hlist_node dead_node;
 231         };
 232         struct binder_proc *proc;
 233         struct hlist_head refs;
 234         int internal_strong_refs;
 235         int local_weak_refs;
 236         int local_strong_refs;
 237         binder_uintptr_t ptr;
 238         binder_uintptr_t cookie;
 239         unsigned has_strong_ref:1;
 240         unsigned pending_strong_ref:1;
 241         unsigned has_weak_ref:1;
 242         unsigned pending_weak_ref:1;
 243         unsigned has_async_transaction:1;
 244         unsigned accept_fds:1;
 245         unsigned min_priority:8;
 246         struct list_head async_todo;
 247 };
 248
 249 struct binder_ref_death {
 250         struct binder_work work;
 251         binder_uintptr_t cookie;
 252 };
 253
 254 struct binder_ref {
 255         /* Lookups needed: */
 256         /*   node + proc => ref (transaction) */
 257         /*   desc + proc => ref (transaction, inc/dec ref) */
 258         /*   node => refs + procs (proc exit) */
 259         int debug_id;
 260         struct rb_node rb_node_desc;
 261         struct rb_node rb_node_node;
 262         struct hlist_node node_entry;
 263         struct binder_proc *proc;
 264         struct binder_node *node;
 265         uint32_t desc;
 266         int strong;
 267         int weak;
 268         struct binder_ref_death *death;
 269 };
 270
 271 struct binder_buffer {
 272         struct list_head entry; /* free and allocated entries by address */
 273         struct rb_node rb_node; /* free entry by size or allocated entry */
 274                                 /* by address */
 275         unsigned free:1;
 276         unsigned allow_user_free:1;
 277         unsigned async_transaction:1;
 278         unsigned debug_id:29;
 279
 280         struct binder_transaction *transaction;
 281
 282         struct binder_node *target_node;
 283         size_t data_size;
 284         size_t offsets_size;
 285         uint8_t data[0];
 286 };
 287
 288 enum binder_deferred_state {
 289         BINDER_DEFERRED_PUT_FILES    = 0x01,
 290         BINDER_DEFERRED_FLUSH        = 0x02,
 291         BINDER_DEFERRED_RELEASE      = 0x04,
 292 };
 293
 294 struct binder_proc {
 295         struct hlist_node proc_node;
 296         struct rb_root threads;
 297         struct rb_root nodes;
 298         struct rb_root refs_by_desc;
 299         struct rb_root refs_by_node;
 300         int pid;
 301         struct vm_area_struct *vma;
 302         struct mm_struct *vma_vm_mm;
 303         struct task_struct *tsk;
 304         struct files_struct *files;
 305         struct hlist_node deferred_work_node;
 306         int deferred_work;
 307         void *buffer;
 308         ptrdiff_t user_buffer_offset;
 309
 310         struct list_head buffers;
 311         struct rb_root free_buffers;
 312         struct rb_root allocated_buffers;
 313         size_t free_async_space;
 314
 315         struct page **pages;
 316         size_t buffer_size;
 317         uint32_t buffer_free;
 318         struct list_head todo;
 319         wait_queue_head_t wait;
 320         struct binder_stats stats;
 321         struct list_head delivered_death;
 322         int max_threads;
 323         int requested_threads;
 324         int requested_threads_started;
 325         int ready_threads;
 326         long default_priority;
 327         struct dentry *debugfs_entry;
 328 };
 329
 330 enum {
 331         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 332         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 333         BINDER_LOOPER_STATE_EXITED      = 0x04,
 334         BINDER_LOOPER_STATE_INVALID     = 0x08,
 335         BINDER_LOOPER_STATE_WAITING     = 0x10,
 336         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 337 };
 338
 339 struct binder_thread {
 340         struct binder_proc *proc;
 341         struct rb_node rb_node;
 342         int pid;
 343         int looper;
 344         struct binder_transaction *transaction_stack;
 345         struct list_head todo;
 346         uint32_t return_error; /* Write failed, return error code in read buf */
 347         uint32_t return_error2; /* Write failed, return error code in read */
 348                 /* buffer. Used when sending a reply to a dead process that */
 349                 /* we are also waiting on */
 350         wait_queue_head_t wait;
 351         struct binder_stats stats;
 352 };
 353
 354 struct binder_transaction {
 355         int debug_id;
 356         struct binder_work work;
 357         struct binder_thread *from;
 358         struct binder_transaction *from_parent;
 359         struct binder_proc *to_proc;
 360         struct binder_thread *to_thread;
 361         struct binder_transaction *to_parent;
 362         unsigned need_reply:1;
 363         /* unsigned is_dead:1; */       /* not used at the moment */
 364
 365         struct binder_buffer *buffer;
 366         unsigned int    code;
 367         unsigned int    flags;
 368         long    priority;
 369         long    saved_priority;
 370         kuid_t  sender_euid;
 371 };
 372
 373 static void
 374 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 375
 376 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 377 {
 378         struct files_struct *files = proc->files;
 379         unsigned long rlim_cur;
 380         unsigned long irqs;
 381
 382         if (files == NULL)
 383                 return -ESRCH;
 384
 385         if (!lock_task_sighand(proc->tsk, &irqs))
 386                 return -EMFILE;
 387
 388         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 389         unlock_task_sighand(proc->tsk, &irqs);
 390
 391         return __alloc_fd(files, 0, rlim_cur, flags);
 392 }
 393
 394 /*
 395  * copied from fd_install
 396  */
 397 static void task_fd_install(
 398         struct binder_proc *proc, unsigned int fd, struct file *file)
 399 {
 400         if (proc->files)
 401                 __fd_install(proc->files, fd, file);
 402 }
 403
 404 /*
 405  * copied from sys_close
 406  */
 407 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 408 {
 409         int retval;
 410
 411         if (proc->files == NULL)
 412                 return -ESRCH;
 413
 414         retval = __close_fd(proc->files, fd);
 415         /* can't restart close syscall because file table entry was cleared */
 416         if (unlikely(retval == -ERESTARTSYS ||
 417                      retval == -ERESTARTNOINTR ||
 418                      retval == -ERESTARTNOHAND ||
 419                      retval == -ERESTART_RESTARTBLOCK))
 420                 retval = -EINTR;
 421
 422         return retval;
 423 }
 424
 425 static inline void binder_lock(const char *tag)
 426 {
 427         trace_binder_lock(tag);
 428         mutex_lock(&binder_main_lock);
 429         trace_binder_locked(tag);
 430 }
 431
 432 static inline void binder_unlock(const char *tag)
 433 {
 434         trace_binder_unlock(tag);
 435         mutex_unlock(&binder_main_lock);
 436 }
 437
 438 static void binder_set_nice(long nice)
 439 {
 440         long min_nice;
 441
 442         if (can_nice(current, nice)) {
 443                 set_user_nice(current, nice);
 444                 return;
 445         }
 446         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 447         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 448                      "%d: nice value %ld not allowed use %ld instead\n",
 449                       current->pid, nice, min_nice);
 450         set_user_nice(current, min_nice);
 451         if (min_nice < 20)
 452                 return;
 453         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 454 }
 455
 456 static size_t binder_buffer_size(struct binder_proc *proc,
 457                                  struct binder_buffer *buffer)
 458 {
 459         if (list_is_last(&buffer->entry, &proc->buffers))
 460                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 461         return (size_t)list_entry(buffer->entry.next,
 462                           struct binder_buffer, entry) - (size_t)buffer->data;
 463 }
 464
 465 static void binder_insert_free_buffer(struct binder_proc *proc,
 466                                       struct binder_buffer *new_buffer)
 467 {
 468         struct rb_node **p = &proc->free_buffers.rb_node;
 469         struct rb_node *parent = NULL;
 470         struct binder_buffer *buffer;
 471         size_t buffer_size;
 472         size_t new_buffer_size;
 473
 474         BUG_ON(!new_buffer->free);
 475
 476         new_buffer_size = binder_buffer_size(proc, new_buffer);
 477
 478         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 479                      "%d: add free buffer, size %zd, at %p\n",
 480                       proc->pid, new_buffer_size, new_buffer);
 481
 482         while (*p) {
 483                 parent = *p;
 484                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 485                 BUG_ON(!buffer->free);
 486
 487                 buffer_size = binder_buffer_size(proc, buffer);
 488
 489                 if (new_buffer_size < buffer_size)
 490                         p = &parent->rb_left;
 491                 else
 492                         p = &parent->rb_right;
 493         }
 494         rb_link_node(&new_buffer->rb_node, parent, p);
 495         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 496 }
 497
 498 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 499                                            struct binder_buffer *new_buffer)
 500 {
 501         struct rb_node **p = &proc->allocated_buffers.rb_node;
 502         struct rb_node *parent = NULL;
 503         struct binder_buffer *buffer;
 504
 505         BUG_ON(new_buffer->free);
 506
 507         while (*p) {
 508                 parent = *p;
 509                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 510                 BUG_ON(buffer->free);
 511
 512                 if (new_buffer < buffer)
 513                         p = &parent->rb_left;
 514                 else if (new_buffer > buffer)
 515                         p = &parent->rb_right;
 516                 else
 517                         BUG();
 518         }
 519         rb_link_node(&new_buffer->rb_node, parent, p);
 520         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 521 }
 522
 523 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 524                                                   uintptr_t user_ptr)
 525 {
 526         struct rb_node *n = proc->allocated_buffers.rb_node;
 527         struct binder_buffer *buffer;
 528         struct binder_buffer *kern_ptr;
 529
 530         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 531                 - offsetof(struct binder_buffer, data));
 532
 533         while (n) {
 534                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 535                 BUG_ON(buffer->free);
 536
 537                 if (kern_ptr < buffer)
 538                         n = n->rb_left;
 539                 else if (kern_ptr > buffer)
 540                         n = n->rb_right;
 541                 else
 542                         return buffer;
 543         }
 544         return NULL;
 545 }
 546
 547 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 548                                     void *start, void *end,
 549                                     struct vm_area_struct *vma)
 550 {
 551         void *page_addr;
 552         unsigned long user_page_addr;
 553         struct vm_struct tmp_area;
 554         struct page **page;
 555         struct mm_struct *mm;
 556
 557         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 558                      "%d: %s pages %p-%p\n", proc->pid,
 559                      allocate ? "allocate" : "free", start, end);
 560
 561         if (end <= start)
 562                 return 0;
 563
 564         trace_binder_update_page_range(proc, allocate, start, end);
 565
 566         if (vma)
 567                 mm = NULL;
 568         else
 569                 mm = get_task_mm(proc->tsk);
 570
 571         if (mm) {
 572                 down_write(&mm->mmap_sem);
 573                 vma = proc->vma;
 574                 if (vma && mm != proc->vma_vm_mm) {
 575                         pr_err("%d: vma mm and task mm mismatch\n",
 576                                 proc->pid);
 577                         vma = NULL;
 578                 }
 579         }
 580
 581         if (allocate == 0)
 582                 goto free_range;
 583
 584         if (vma == NULL) {
 585                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 586                         proc->pid);
 587                 goto err_no_vma;
 588         }
 589
 590         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 591                 int ret;
 592                 struct page **page_array_ptr;
 593
 594                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 595
 596                 BUG_ON(*page);
 597                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 598                 if (*page == NULL) {
 599                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 600                                 proc->pid, page_addr);
 601                         goto err_alloc_page_failed;
 602                 }
 603                 tmp_area.addr = page_addr;
 604                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 605                 page_array_ptr = page;
 606                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 607                 if (ret) {
 608                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 609                                proc->pid, page_addr);
 610                         goto err_map_kernel_failed;
 611                 }
 612                 user_page_addr =
 613                         (uintptr_t)page_addr + proc->user_buffer_offset;
 614                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 615                 if (ret) {
 616                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 617                                proc->pid, user_page_addr);
 618                         goto err_vm_insert_page_failed;
 619                 }
 620                 /* vm_insert_page does not seem to increment the refcount */
 621         }
 622         if (mm) {
 623                 up_write(&mm->mmap_sem);
 624                 mmput(mm);
 625         }
 626         return 0;
 627
 628 free_range:
 629         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 630              page_addr -= PAGE_SIZE) {
 631                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 632                 if (vma)
 633                         zap_page_range(vma, (uintptr_t)page_addr +
 634                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 635 err_vm_insert_page_failed:
 636                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 637 err_map_kernel_failed:
 638                 __free_page(*page);
 639                 *page = NULL;
 640 err_alloc_page_failed:
 641                 ;
 642         }
 643 err_no_vma:
 644         if (mm) {
 645                 up_write(&mm->mmap_sem);
 646                 mmput(mm);
 647         }
 648         return -ENOMEM;
 649 }
 650
 651 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 652                                               size_t data_size,
 653                                               size_t offsets_size, int is_async)
 654 {
 655         struct rb_node *n = proc->free_buffers.rb_node;
 656         struct binder_buffer *buffer;
 657         size_t buffer_size;
 658         struct rb_node *best_fit = NULL;
 659         void *has_page_addr;
 660         void *end_page_addr;
 661         size_t size;
 662
 663         if (proc->vma == NULL) {
 664                 pr_err("%d: binder_alloc_buf, no vma\n",
 665                        proc->pid);
 666                 return NULL;
 667         }
 668
 669         size = ALIGN(data_size, sizeof(void *)) +
 670                 ALIGN(offsets_size, sizeof(void *));
 671
 672         if (size < data_size || size < offsets_size) {
 673                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 674                                 proc->pid, data_size, offsets_size);
 675                 return NULL;
 676         }
 677
 678         if (is_async &&
 679             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 680                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 681                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 682                               proc->pid, size);
 683                 return NULL;
 684         }
 685
 686         while (n) {
 687                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 688                 BUG_ON(!buffer->free);
 689                 buffer_size = binder_buffer_size(proc, buffer);
 690
 691                 if (size < buffer_size) {
 692                         best_fit = n;
 693                         n = n->rb_left;
 694                 } else if (size > buffer_size)
 695                         n = n->rb_right;
 696                 else {
 697                         best_fit = n;
 698                         break;
 699                 }
 700         }
 701         if (best_fit == NULL) {
 702                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 703                         proc->pid, size);
 704                 return NULL;
 705         }
 706         if (n == NULL) {
 707                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 708                 buffer_size = binder_buffer_size(proc, buffer);
 709         }
 710
 711         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 712                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 713                       proc->pid, size, buffer, buffer_size);
 714
 715         has_page_addr =
 716                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 717         if (n == NULL) {
 718                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 719                         buffer_size = size; /* no room for other buffers */
 720                 else
 721                         buffer_size = size + sizeof(struct binder_buffer);
 722         }
 723         end_page_addr =
 724                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 725         if (end_page_addr > has_page_addr)
 726                 end_page_addr = has_page_addr;
 727         if (binder_update_page_range(proc, 1,
 728             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 729                 return NULL;
 730
 731         rb_erase(best_fit, &proc->free_buffers);
 732         buffer->free = 0;
 733         binder_insert_allocated_buffer(proc, buffer);
 734         if (buffer_size != size) {
 735                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 736
 737                 list_add(&new_buffer->entry, &buffer->entry);
 738                 new_buffer->free = 1;
 739                 binder_insert_free_buffer(proc, new_buffer);
 740         }
 741         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 742                      "%d: binder_alloc_buf size %zd got %p\n",
 743                       proc->pid, size, buffer);
 744         buffer->data_size = data_size;
 745         buffer->offsets_size = offsets_size;
 746         buffer->async_transaction = is_async;
 747         if (is_async) {
 748                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 749                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 750                              "%d: binder_alloc_buf size %zd async free %zd\n",
 751                               proc->pid, size, proc->free_async_space);
 752         }
 753
 754         return buffer;
 755 }
 756
 757 static void *buffer_start_page(struct binder_buffer *buffer)
 758 {
 759         return (void *)((uintptr_t)buffer & PAGE_MASK);
 760 }
 761
 762 static void *buffer_end_page(struct binder_buffer *buffer)
 763 {
 764         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 765 }
 766
 767 static void binder_delete_free_buffer(struct binder_proc *proc,
 768                                       struct binder_buffer *buffer)
 769 {
 770         struct binder_buffer *prev, *next = NULL;
 771         int free_page_end = 1;
 772         int free_page_start = 1;
 773
 774         BUG_ON(proc->buffers.next == &buffer->entry);
 775         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 776         BUG_ON(!prev->free);
 777         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 778                 free_page_start = 0;
 779                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 780                         free_page_end = 0;
 781                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 782                              "%d: merge free, buffer %p share page with %p\n",
 783                               proc->pid, buffer, prev);
 784         }
 785
 786         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 787                 next = list_entry(buffer->entry.next,
 788                                   struct binder_buffer, entry);
 789                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 790                         free_page_end = 0;
 791                         if (buffer_start_page(next) ==
 792                             buffer_start_page(buffer))
 793                                 free_page_start = 0;
 794                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 795                                      "%d: merge free, buffer %p share page with %p\n",
 796                                       proc->pid, buffer, prev);
 797                 }
 798         }
 799         list_del(&buffer->entry);
 800         if (free_page_start || free_page_end) {
 801                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 802                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 803                              proc->pid, buffer, free_page_start ? "" : " end",
 804                              free_page_end ? "" : " start", prev, next);
 805                 binder_update_page_range(proc, 0, free_page_start ?
 806                         buffer_start_page(buffer) : buffer_end_page(buffer),
 807                         (free_page_end ? buffer_end_page(buffer) :
 808                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 809         }
 810 }
 811
 812 static void binder_free_buf(struct binder_proc *proc,
 813                             struct binder_buffer *buffer)
 814 {
 815         size_t size, buffer_size;
 816
 817         buffer_size = binder_buffer_size(proc, buffer);
 818
 819         size = ALIGN(buffer->data_size, sizeof(void *)) +
 820                 ALIGN(buffer->offsets_size, sizeof(void *));
 821
 822         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 823                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 824                       proc->pid, buffer, size, buffer_size);
 825
 826         BUG_ON(buffer->free);
 827         BUG_ON(size > buffer_size);
 828         BUG_ON(buffer->transaction != NULL);
 829         BUG_ON((void *)buffer < proc->buffer);
 830         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 831
 832         if (buffer->async_transaction) {
 833                 proc->free_async_space += size + sizeof(struct binder_buffer);
 834
 835                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 836                              "%d: binder_free_buf size %zd async free %zd\n",
 837                               proc->pid, size, proc->free_async_space);
 838         }
 839
 840         binder_update_page_range(proc, 0,
 841                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 842                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 843                 NULL);
 844         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 845         buffer->free = 1;
 846         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 847                 struct binder_buffer *next = list_entry(buffer->entry.next,
 848                                                 struct binder_buffer, entry);
 849
 850                 if (next->free) {
 851                         rb_erase(&next->rb_node, &proc->free_buffers);
 852                         binder_delete_free_buffer(proc, next);
 853                 }
 854         }
 855         if (proc->buffers.next != &buffer->entry) {
 856                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 857                                                 struct binder_buffer, entry);
 858
 859                 if (prev->free) {
 860                         binder_delete_free_buffer(proc, buffer);
 861                         rb_erase(&prev->rb_node, &proc->free_buffers);
 862                         buffer = prev;
 863                 }
 864         }
 865         binder_insert_free_buffer(proc, buffer);
 866 }
 867
 868 static struct binder_node *binder_get_node(struct binder_proc *proc,
 869                                            binder_uintptr_t ptr)
 870 {
 871         struct rb_node *n = proc->nodes.rb_node;
 872         struct binder_node *node;
 873
 874         while (n) {
 875                 node = rb_entry(n, struct binder_node, rb_node);
 876
 877                 if (ptr < node->ptr)
 878                         n = n->rb_left;
 879                 else if (ptr > node->ptr)
 880                         n = n->rb_right;
 881                 else
 882                         return node;
 883         }
 884         return NULL;
 885 }
 886
 887 static struct binder_node *binder_new_node(struct binder_proc *proc,
 888                                            binder_uintptr_t ptr,
 889                                            binder_uintptr_t cookie)
 890 {
 891         struct rb_node **p = &proc->nodes.rb_node;
 892         struct rb_node *parent = NULL;
 893         struct binder_node *node;
 894
 895         while (*p) {
 896                 parent = *p;
 897                 node = rb_entry(parent, struct binder_node, rb_node);
 898
 899                 if (ptr < node->ptr)
 900                         p = &(*p)->rb_left;
 901                 else if (ptr > node->ptr)
 902                         p = &(*p)->rb_right;
 903                 else
 904                         return NULL;
 905         }
 906
 907         node = kzalloc(sizeof(*node), GFP_KERNEL);
 908         if (node == NULL)
 909                 return NULL;
 910         binder_stats_created(BINDER_STAT_NODE);
 911         rb_link_node(&node->rb_node, parent, p);
 912         rb_insert_color(&node->rb_node, &proc->nodes);
 913         node->debug_id = ++binder_last_id;
 914         node->proc = proc;
 915         node->ptr = ptr;
 916         node->cookie = cookie;
 917         node->work.type = BINDER_WORK_NODE;
 918         INIT_LIST_HEAD(&node->work.entry);
 919         INIT_LIST_HEAD(&node->async_todo);
 920         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 921                      "%d:%d node %d u%016llx c%016llx created\n",
 922                      proc->pid, current->pid, node->debug_id,
 923                      (u64)node->ptr, (u64)node->cookie);
 924         return node;
 925 }
 926
 927 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 928                            struct list_head *target_list)
 929 {
 930         if (strong) {
 931                 if (internal) {
 932                         if (target_list == NULL &&
 933                             node->internal_strong_refs == 0 &&
 934                             !(node == binder_context_mgr_node &&
 935                             node->has_strong_ref)) {
 936                                 pr_err("invalid inc strong node for %d\n",
 937                                         node->debug_id);
 938                                 return -EINVAL;
 939                         }
 940                         node->internal_strong_refs++;
 941                 } else
 942                         node->local_strong_refs++;
 943                 if (!node->has_strong_ref && target_list) {
 944                         list_del_init(&node->work.entry);
 945                         list_add_tail(&node->work.entry, target_list);
 946                 }
 947         } else {
 948                 if (!internal)
 949                         node->local_weak_refs++;
 950                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 951                         if (target_list == NULL) {
 952                                 pr_err("invalid inc weak node for %d\n",
 953                                         node->debug_id);
 954                                 return -EINVAL;
 955                         }
 956                         list_add_tail(&node->work.entry, target_list);
 957                 }
 958         }
 959         return 0;
 960 }
 961
 962 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 963 {
 964         if (strong) {
 965                 if (internal)
 966                         node->internal_strong_refs--;
 967                 else
 968                         node->local_strong_refs--;
 969                 if (node->local_strong_refs || node->internal_strong_refs)
 970                         return 0;
 971         } else {
 972                 if (!internal)
 973                         node->local_weak_refs--;
 974                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 975                         return 0;
 976         }
 977         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 978                 if (list_empty(&node->work.entry)) {
 979                         list_add_tail(&node->work.entry, &node->proc->todo);
 980                         wake_up_interruptible(&node->proc->wait);
 981                 }
 982         } else {
 983                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 984                     !node->local_weak_refs) {
 985                         list_del_init(&node->work.entry);
 986                         if (node->proc) {
 987                                 rb_erase(&node->rb_node, &node->proc->nodes);
 988                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 989                                              "refless node %d deleted\n",
 990                                              node->debug_id);
 991                         } else {
 992                                 hlist_del(&node->dead_node);
 993                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 994                                              "dead node %d deleted\n",
 995                                              node->debug_id);
 996                         }
 997                         kfree(node);
 998                         binder_stats_deleted(BINDER_STAT_NODE);
 999                 }
1000         }
1001
1002         return 0;
1003 }
1004
1005
1006 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1007                                          uint32_t desc)
1008 {
1009         struct rb_node *n = proc->refs_by_desc.rb_node;
1010         struct binder_ref *ref;
1011
1012         while (n) {
1013                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1014
1015                 if (desc < ref->desc)
1016                         n = n->rb_left;
1017                 else if (desc > ref->desc)
1018                         n = n->rb_right;
1019                 else
1020                         return ref;
1021         }
1022         return NULL;
1023 }
1024
1025 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1026                                                   struct binder_node *node)
1027 {
1028         struct rb_node *n;
1029         struct rb_node **p = &proc->refs_by_node.rb_node;
1030         struct rb_node *parent = NULL;
1031         struct binder_ref *ref, *new_ref;
1032
1033         while (*p) {
1034                 parent = *p;
1035                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1036
1037                 if (node < ref->node)
1038                         p = &(*p)->rb_left;
1039                 else if (node > ref->node)
1040                         p = &(*p)->rb_right;
1041                 else
1042                         return ref;
1043         }
1044         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1045         if (new_ref == NULL)
1046                 return NULL;
1047         binder_stats_created(BINDER_STAT_REF);
1048         new_ref->debug_id = ++binder_last_id;
1049         new_ref->proc = proc;
1050         new_ref->node = node;
1051         rb_link_node(&new_ref->rb_node_node, parent, p);
1052         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1053
1054         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1055         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1056                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1057                 if (ref->desc > new_ref->desc)
1058                         break;
1059                 new_ref->desc = ref->desc + 1;
1060         }
1061
1062         p = &proc->refs_by_desc.rb_node;
1063         while (*p) {
1064                 parent = *p;
1065                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1066
1067                 if (new_ref->desc < ref->desc)
1068                         p = &(*p)->rb_left;
1069                 else if (new_ref->desc > ref->desc)
1070                         p = &(*p)->rb_right;
1071                 else
1072                         BUG();
1073         }
1074         rb_link_node(&new_ref->rb_node_desc, parent, p);
1075         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1076         if (node) {
1077                 hlist_add_head(&new_ref->node_entry, &node->refs);
1078
1079                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1080                              "%d new ref %d desc %d for node %d\n",
1081                               proc->pid, new_ref->debug_id, new_ref->desc,
1082                               node->debug_id);
1083         } else {
1084                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1085                              "%d new ref %d desc %d for dead node\n",
1086                               proc->pid, new_ref->debug_id, new_ref->desc);
1087         }
1088         return new_ref;
1089 }
1090
1091 static void binder_delete_ref(struct binder_ref *ref)
1092 {
1093         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1094                      "%d delete ref %d desc %d for node %d\n",
1095                       ref->proc->pid, ref->debug_id, ref->desc,
1096                       ref->node->debug_id);
1097
1098         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1099         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1100         if (ref->strong)
1101                 binder_dec_node(ref->node, 1, 1);
1102         hlist_del(&ref->node_entry);
1103         binder_dec_node(ref->node, 0, 1);
1104         if (ref->death) {
1105                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1106                              "%d delete ref %d desc %d has death notification\n",
1107                               ref->proc->pid, ref->debug_id, ref->desc);
1108                 list_del(&ref->death->work.entry);
1109                 kfree(ref->death);
1110                 binder_stats_deleted(BINDER_STAT_DEATH);
1111         }
1112         kfree(ref);
1113         binder_stats_deleted(BINDER_STAT_REF);
1114 }
1115
1116 static int binder_inc_ref(struct binder_ref *ref, int strong,
1117                           struct list_head *target_list)
1118 {
1119         int ret;
1120
1121         if (strong) {
1122                 if (ref->strong == 0) {
1123                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1124                         if (ret)
1125                                 return ret;
1126                 }
1127                 ref->strong++;
1128         } else {
1129                 if (ref->weak == 0) {
1130                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1131                         if (ret)
1132                                 return ret;
1133                 }
1134                 ref->weak++;
1135         }
1136         return 0;
1137 }
1138
1139
1140 static int binder_dec_ref(struct binder_ref *ref, int strong)
1141 {
1142         if (strong) {
1143                 if (ref->strong == 0) {
1144                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1145                                           ref->proc->pid, ref->debug_id,
1146                                           ref->desc, ref->strong, ref->weak);
1147                         return -EINVAL;
1148                 }
1149                 ref->strong--;
1150                 if (ref->strong == 0) {
1151                         int ret;
1152
1153                         ret = binder_dec_node(ref->node, strong, 1);
1154                         if (ret)
1155                                 return ret;
1156                 }
1157         } else {
1158                 if (ref->weak == 0) {
1159                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1160                                           ref->proc->pid, ref->debug_id,
1161                                           ref->desc, ref->strong, ref->weak);
1162                         return -EINVAL;
1163                 }
1164                 ref->weak--;
1165         }
1166         if (ref->strong == 0 && ref->weak == 0)
1167                 binder_delete_ref(ref);
1168         return 0;
1169 }
1170
1171 static void binder_pop_transaction(struct binder_thread *target_thread,
1172                                    struct binder_transaction *t)
1173 {
1174         if (target_thread) {
1175                 BUG_ON(target_thread->transaction_stack != t);
1176                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1177                 target_thread->transaction_stack =
1178                         target_thread->transaction_stack->from_parent;
1179                 t->from = NULL;
1180         }
1181         t->need_reply = 0;
1182         if (t->buffer)
1183                 t->buffer->transaction = NULL;
1184         kfree(t);
1185         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1186 }
1187
1188 static void binder_send_failed_reply(struct binder_transaction *t,
1189                                      uint32_t error_code)
1190 {
1191         struct binder_thread *target_thread;
1192         struct binder_transaction *next;
1193
1194         BUG_ON(t->flags & TF_ONE_WAY);
1195         while (1) {
1196                 target_thread = t->from;
1197                 if (target_thread) {
1198                         if (target_thread->return_error != BR_OK &&
1199                            target_thread->return_error2 == BR_OK) {
1200                                 target_thread->return_error2 =
1201                                         target_thread->return_error;
1202                                 target_thread->return_error = BR_OK;
1203                         }
1204                         if (target_thread->return_error == BR_OK) {
1205                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1206                                              "send failed reply for transaction %d to %d:%d\n",
1207                                               t->debug_id,
1208                                               target_thread->proc->pid,
1209                                               target_thread->pid);
1210
1211                                 binder_pop_transaction(target_thread, t);
1212                                 target_thread->return_error = error_code;
1213                                 wake_up_interruptible(&target_thread->wait);
1214                         } else {
1215                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1216                                         target_thread->proc->pid,
1217                                         target_thread->pid,
1218                                         target_thread->return_error);
1219                         }
1220                         return;
1221                 }
1222                 next = t->from_parent;
1223
1224                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1225                              "send failed reply for transaction %d, target dead\n",
1226                              t->debug_id);
1227
1228                 binder_pop_transaction(target_thread, t);
1229                 if (next == NULL) {
1230                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1231                                      "reply failed, no target thread at root\n");
1232                         return;
1233                 }
1234                 t = next;
1235                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1236                              "reply failed, no target thread -- retry %d\n",
1237                               t->debug_id);
1238         }
1239 }
1240
1241 static void binder_transaction_buffer_release(struct binder_proc *proc,
1242                                               struct binder_buffer *buffer,
1243                                               binder_size_t *failed_at)
1244 {
1245         binder_size_t *offp, *off_end;
1246         int debug_id = buffer->debug_id;
1247
1248         binder_debug(BINDER_DEBUG_TRANSACTION,
1249                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1250                      proc->pid, buffer->debug_id,
1251                      buffer->data_size, buffer->offsets_size, failed_at);
1252
1253         if (buffer->target_node)
1254                 binder_dec_node(buffer->target_node, 1, 0);
1255
1256         offp = (binder_size_t *)(buffer->data +
1257                                  ALIGN(buffer->data_size, sizeof(void *)));
1258         if (failed_at)
1259                 off_end = failed_at;
1260         else
1261                 off_end = (void *)offp + buffer->offsets_size;
1262         for (; offp < off_end; offp++) {
1263                 struct flat_binder_object *fp;
1264
1265                 if (*offp > buffer->data_size - sizeof(*fp) ||
1266                     buffer->data_size < sizeof(*fp) ||
1267                     !IS_ALIGNED(*offp, sizeof(u32))) {
1268                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1269                                debug_id, (u64)*offp, buffer->data_size);
1270                         continue;
1271                 }
1272                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1273                 switch (fp->type) {
1274                 case BINDER_TYPE_BINDER:
1275                 case BINDER_TYPE_WEAK_BINDER: {
1276                         struct binder_node *node = binder_get_node(proc, fp->binder);
1277
1278                         if (node == NULL) {
1279                                 pr_err("transaction release %d bad node %016llx\n",
1280                                        debug_id, (u64)fp->binder);
1281                                 break;
1282                         }
1283                         binder_debug(BINDER_DEBUG_TRANSACTION,
1284                                      "        node %d u%016llx\n",
1285                                      node->debug_id, (u64)node->ptr);
1286                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1287                 } break;
1288                 case BINDER_TYPE_HANDLE:
1289                 case BINDER_TYPE_WEAK_HANDLE: {
1290                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1291
1292                         if (ref == NULL) {
1293                                 pr_err("transaction release %d bad handle %d\n",
1294                                  debug_id, fp->handle);
1295                                 break;
1296                         }
1297                         binder_debug(BINDER_DEBUG_TRANSACTION,
1298                                      "        ref %d desc %d (node %d)\n",
1299                                      ref->debug_id, ref->desc, ref->node->debug_id);
1300                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1301                 } break;
1302
1303                 case BINDER_TYPE_FD:
1304                         binder_debug(BINDER_DEBUG_TRANSACTION,
1305                                      "        fd %d\n", fp->handle);
1306                         if (failed_at)
1307                                 task_close_fd(proc, fp->handle);
1308                         break;
1309
1310                 default:
1311                         pr_err("transaction release %d bad object type %x\n",
1312                                 debug_id, fp->type);
1313                         break;
1314                 }
1315         }
1316 }
1317
1318 static void binder_transaction(struct binder_proc *proc,
1319                                struct binder_thread *thread,
1320                                struct binder_transaction_data *tr, int reply)
1321 {
1322         struct binder_transaction *t;
1323         struct binder_work *tcomplete;
1324         binder_size_t *offp, *off_end;
1325         binder_size_t off_min;
1326         struct binder_proc *target_proc;
1327         struct binder_thread *target_thread = NULL;
1328         struct binder_node *target_node = NULL;
1329         struct list_head *target_list;
1330         wait_queue_head_t *target_wait;
1331         struct binder_transaction *in_reply_to = NULL;
1332         struct binder_transaction_log_entry *e;
1333         uint32_t return_error;
1334
1335         e = binder_transaction_log_add(&binder_transaction_log);
1336         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1337         e->from_proc = proc->pid;
1338         e->from_thread = thread->pid;
1339         e->target_handle = tr->target.handle;
1340         e->data_size = tr->data_size;
1341         e->offsets_size = tr->offsets_size;
1342
1343         if (reply) {
1344                 in_reply_to = thread->transaction_stack;
1345                 if (in_reply_to == NULL) {
1346                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1347                                           proc->pid, thread->pid);
1348                         return_error = BR_FAILED_REPLY;
1349                         goto err_empty_call_stack;
1350                 }
1351                 binder_set_nice(in_reply_to->saved_priority);
1352                 if (in_reply_to->to_thread != thread) {
1353                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1354                                 proc->pid, thread->pid, in_reply_to->debug_id,
1355                                 in_reply_to->to_proc ?
1356                                 in_reply_to->to_proc->pid : 0,
1357                                 in_reply_to->to_thread ?
1358                                 in_reply_to->to_thread->pid : 0);
1359                         return_error = BR_FAILED_REPLY;
1360                         in_reply_to = NULL;
1361                         goto err_bad_call_stack;
1362                 }
1363                 thread->transaction_stack = in_reply_to->to_parent;
1364                 target_thread = in_reply_to->from;
1365                 if (target_thread == NULL) {
1366                         return_error = BR_DEAD_REPLY;
1367                         goto err_dead_binder;
1368                 }
1369                 if (target_thread->transaction_stack != in_reply_to) {
1370                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1371                                 proc->pid, thread->pid,
1372                                 target_thread->transaction_stack ?
1373                                 target_thread->transaction_stack->debug_id : 0,
1374                                 in_reply_to->debug_id);
1375                         return_error = BR_FAILED_REPLY;
1376                         in_reply_to = NULL;
1377                         target_thread = NULL;
1378                         goto err_dead_binder;
1379                 }
1380                 target_proc = target_thread->proc;
1381         } else {
1382                 if (tr->target.handle) {
1383                         struct binder_ref *ref;
1384
1385                         ref = binder_get_ref(proc, tr->target.handle);
1386                         if (ref == NULL) {
1387                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1388                                         proc->pid, thread->pid);
1389                                 return_error = BR_FAILED_REPLY;
1390                                 goto err_invalid_target_handle;
1391                         }
1392                         target_node = ref->node;
1393                 } else {
1394                         target_node = binder_context_mgr_node;
1395                         if (target_node == NULL) {
1396                                 return_error = BR_DEAD_REPLY;
1397                                 goto err_no_context_mgr_node;
1398                         }
1399                 }
1400                 e->to_node = target_node->debug_id;
1401                 target_proc = target_node->proc;
1402                 if (target_proc == NULL) {
1403                         return_error = BR_DEAD_REPLY;
1404                         goto err_dead_binder;
1405                 }
1406                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1407                         struct binder_transaction *tmp;
1408
1409                         tmp = thread->transaction_stack;
1410                         if (tmp->to_thread != thread) {
1411                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1412                                         proc->pid, thread->pid, tmp->debug_id,
1413                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1414                                         tmp->to_thread ?
1415                                         tmp->to_thread->pid : 0);
1416                                 return_error = BR_FAILED_REPLY;
1417                                 goto err_bad_call_stack;
1418                         }
1419                         while (tmp) {
1420                                 if (tmp->from && tmp->from->proc == target_proc)
1421                                         target_thread = tmp->from;
1422                                 tmp = tmp->from_parent;
1423                         }
1424                 }
1425         }
1426         if (target_thread) {
1427                 e->to_thread = target_thread->pid;
1428                 target_list = &target_thread->todo;
1429                 target_wait = &target_thread->wait;
1430         } else {
1431                 target_list = &target_proc->todo;
1432                 target_wait = &target_proc->wait;
1433         }
1434         e->to_proc = target_proc->pid;
1435
1436         /* TODO: reuse incoming transaction for reply */
1437         t = kzalloc(sizeof(*t), GFP_KERNEL);
1438         if (t == NULL) {
1439                 return_error = BR_FAILED_REPLY;
1440                 goto err_alloc_t_failed;
1441         }
1442         binder_stats_created(BINDER_STAT_TRANSACTION);
1443
1444         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1445         if (tcomplete == NULL) {
1446                 return_error = BR_FAILED_REPLY;
1447                 goto err_alloc_tcomplete_failed;
1448         }
1449         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1450
1451         t->debug_id = ++binder_last_id;
1452         e->debug_id = t->debug_id;
1453
1454         if (reply)
1455                 binder_debug(BINDER_DEBUG_TRANSACTION,
1456                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1457                              proc->pid, thread->pid, t->debug_id,
1458                              target_proc->pid, target_thread->pid,
1459                              (u64)tr->data.ptr.buffer,
1460                              (u64)tr->data.ptr.offsets,
1461                              (u64)tr->data_size, (u64)tr->offsets_size);
1462         else
1463                 binder_debug(BINDER_DEBUG_TRANSACTION,
1464                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1465                              proc->pid, thread->pid, t->debug_id,
1466                              target_proc->pid, target_node->debug_id,
1467                              (u64)tr->data.ptr.buffer,
1468                              (u64)tr->data.ptr.offsets,
1469                              (u64)tr->data_size, (u64)tr->offsets_size);
1470
1471         if (!reply && !(tr->flags & TF_ONE_WAY))
1472                 t->from = thread;
1473         else
1474                 t->from = NULL;
1475         t->sender_euid = task_euid(proc->tsk);
1476         t->to_proc = target_proc;
1477         t->to_thread = target_thread;
1478         t->code = tr->code;
1479         t->flags = tr->flags;
1480         t->priority = task_nice(current);
1481
1482         trace_binder_transaction(reply, t, target_node);
1483
1484         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1485                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1486         if (t->buffer == NULL) {
1487                 return_error = BR_FAILED_REPLY;
1488                 goto err_binder_alloc_buf_failed;
1489         }
1490         t->buffer->allow_user_free = 0;
1491         t->buffer->debug_id = t->debug_id;
1492         t->buffer->transaction = t;
1493         t->buffer->target_node = target_node;
1494         trace_binder_transaction_alloc_buf(t->buffer);
1495         if (target_node)
1496                 binder_inc_node(target_node, 1, 0, NULL);
1497
1498         offp = (binder_size_t *)(t->buffer->data +
1499                                  ALIGN(tr->data_size, sizeof(void *)));
1500
1501         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1502                            tr->data.ptr.buffer, tr->data_size)) {
1503                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1504                                 proc->pid, thread->pid);
1505                 return_error = BR_FAILED_REPLY;
1506                 goto err_copy_data_failed;
1507         }
1508         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1509                            tr->data.ptr.offsets, tr->offsets_size)) {
1510                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1511                                 proc->pid, thread->pid);
1512                 return_error = BR_FAILED_REPLY;
1513                 goto err_copy_data_failed;
1514         }
1515         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1516                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1517                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1518                 return_error = BR_FAILED_REPLY;
1519                 goto err_bad_offset;
1520         }
1521         off_end = (void *)offp + tr->offsets_size;
1522         off_min = 0;
1523         for (; offp < off_end; offp++) {
1524                 struct flat_binder_object *fp;
1525
1526                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1527                     *offp < off_min ||
1528                     t->buffer->data_size < sizeof(*fp) ||
1529                     !IS_ALIGNED(*offp, sizeof(u32))) {
1530                         binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
1531                                           proc->pid, thread->pid, (u64)*offp,
1532                                           (u64)off_min,
1533                                           (u64)(t->buffer->data_size -
1534                                           sizeof(*fp)));
1535                         return_error = BR_FAILED_REPLY;
1536                         goto err_bad_offset;
1537                 }
1538                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1539                 off_min = *offp + sizeof(struct flat_binder_object);
1540                 switch (fp->type) {
1541                 case BINDER_TYPE_BINDER:
1542                 case BINDER_TYPE_WEAK_BINDER: {
1543                         struct binder_ref *ref;
1544                         struct binder_node *node = binder_get_node(proc, fp->binder);
1545
1546                         if (node == NULL) {
1547                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1548                                 if (node == NULL) {
1549                                         return_error = BR_FAILED_REPLY;
1550                                         goto err_binder_new_node_failed;
1551                                 }
1552                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1553                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1554                         }
1555                         if (fp->cookie != node->cookie) {
1556                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1557                                         proc->pid, thread->pid,
1558                                         (u64)fp->binder, node->debug_id,
1559                                         (u64)fp->cookie, (u64)node->cookie);
1560                                 return_error = BR_FAILED_REPLY;
1561                                 goto err_binder_get_ref_for_node_failed;
1562                         }
1563                         ref = binder_get_ref_for_node(target_proc, node);
1564                         if (ref == NULL) {
1565                                 return_error = BR_FAILED_REPLY;
1566                                 goto err_binder_get_ref_for_node_failed;
1567                         }
1568                         if (fp->type == BINDER_TYPE_BINDER)
1569                                 fp->type = BINDER_TYPE_HANDLE;
1570                         else
1571                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1572                         fp->handle = ref->desc;
1573                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1574                                        &thread->todo);
1575
1576                         trace_binder_transaction_node_to_ref(t, node, ref);
1577                         binder_debug(BINDER_DEBUG_TRANSACTION,
1578                                      "        node %d u%016llx -> ref %d desc %d\n",
1579                                      node->debug_id, (u64)node->ptr,
1580                                      ref->debug_id, ref->desc);
1581                 } break;
1582                 case BINDER_TYPE_HANDLE:
1583                 case BINDER_TYPE_WEAK_HANDLE: {
1584                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1585
1586                         if (ref == NULL) {
1587                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1588                                                 proc->pid,
1589                                                 thread->pid, fp->handle);
1590                                 return_error = BR_FAILED_REPLY;
1591                                 goto err_binder_get_ref_failed;
1592                         }
1593                         if (ref->node->proc == target_proc) {
1594                                 if (fp->type == BINDER_TYPE_HANDLE)
1595                                         fp->type = BINDER_TYPE_BINDER;
1596                                 else
1597                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1598                                 fp->binder = ref->node->ptr;
1599                                 fp->cookie = ref->node->cookie;
1600                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1601                                 trace_binder_transaction_ref_to_node(t, ref);
1602                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1603                                              "        ref %d desc %d -> node %d u%016llx\n",
1604                                              ref->debug_id, ref->desc, ref->node->debug_id,
1605                                              (u64)ref->node->ptr);
1606                         } else {
1607                                 struct binder_ref *new_ref;
1608
1609                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1610                                 if (new_ref == NULL) {
1611                                         return_error = BR_FAILED_REPLY;
1612                                         goto err_binder_get_ref_for_node_failed;
1613                                 }
1614                                 fp->handle = new_ref->desc;
1615                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1616                                 trace_binder_transaction_ref_to_ref(t, ref,
1617                                                                     new_ref);
1618                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1619                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1620                                              ref->debug_id, ref->desc, new_ref->debug_id,
1621                                              new_ref->desc, ref->node->debug_id);
1622                         }
1623                 } break;
1624
1625                 case BINDER_TYPE_FD: {
1626                         int target_fd;
1627                         struct file *file;
1628
1629                         if (reply) {
1630                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1631                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1632                                                 proc->pid, thread->pid, fp->handle);
1633                                         return_error = BR_FAILED_REPLY;
1634                                         goto err_fd_not_allowed;
1635                                 }
1636                         } else if (!target_node->accept_fds) {
1637                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1638                                         proc->pid, thread->pid, fp->handle);
1639                                 return_error = BR_FAILED_REPLY;
1640                                 goto err_fd_not_allowed;
1641                         }
1642
1643                         file = fget(fp->handle);
1644                         if (file == NULL) {
1645                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1646                                         proc->pid, thread->pid, fp->handle);
1647                                 return_error = BR_FAILED_REPLY;
1648                                 goto err_fget_failed;
1649                         }
1650                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1651                         if (target_fd < 0) {
1652                                 fput(file);
1653                                 return_error = BR_FAILED_REPLY;
1654                                 goto err_get_unused_fd_failed;
1655                         }
1656                         task_fd_install(target_proc, target_fd, file);
1657                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1658                         binder_debug(BINDER_DEBUG_TRANSACTION,
1659                                      "        fd %d -> %d\n", fp->handle, target_fd);
1660                         /* TODO: fput? */
1661                         fp->handle = target_fd;
1662                 } break;
1663
1664                 default:
1665                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1666                                 proc->pid, thread->pid, fp->type);
1667                         return_error = BR_FAILED_REPLY;
1668                         goto err_bad_object_type;
1669                 }
1670         }
1671         if (reply) {
1672                 BUG_ON(t->buffer->async_transaction != 0);
1673                 binder_pop_transaction(target_thread, in_reply_to);
1674         } else if (!(t->flags & TF_ONE_WAY)) {
1675                 BUG_ON(t->buffer->async_transaction != 0);
1676                 t->need_reply = 1;
1677                 t->from_parent = thread->transaction_stack;
1678                 thread->transaction_stack = t;
1679         } else {
1680                 BUG_ON(target_node == NULL);
1681                 BUG_ON(t->buffer->async_transaction != 1);
1682                 if (target_node->has_async_transaction) {
1683                         target_list = &target_node->async_todo;
1684                         target_wait = NULL;
1685                 } else
1686                         target_node->has_async_transaction = 1;
1687         }
1688         t->work.type = BINDER_WORK_TRANSACTION;
1689         list_add_tail(&t->work.entry, target_list);
1690         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1691         list_add_tail(&tcomplete->entry, &thread->todo);
1692         if (target_wait)
1693                 wake_up_interruptible(target_wait);
1694         return;
1695
1696 err_get_unused_fd_failed:
1697 err_fget_failed:
1698 err_fd_not_allowed:
1699 err_binder_get_ref_for_node_failed:
1700 err_binder_get_ref_failed:
1701 err_binder_new_node_failed:
1702 err_bad_object_type:
1703 err_bad_offset:
1704 err_copy_data_failed:
1705         trace_binder_transaction_failed_buffer_release(t->buffer);
1706         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1707         t->buffer->transaction = NULL;
1708         binder_free_buf(target_proc, t->buffer);
1709 err_binder_alloc_buf_failed:
1710         kfree(tcomplete);
1711         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1712 err_alloc_tcomplete_failed:
1713         kfree(t);
1714         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1715 err_alloc_t_failed:
1716 err_bad_call_stack:
1717 err_empty_call_stack:
1718 err_dead_binder:
1719 err_invalid_target_handle:
1720 err_no_context_mgr_node:
1721         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1722                      "%d:%d transaction failed %d, size %lld-%lld\n",
1723                      proc->pid, thread->pid, return_error,
1724                      (u64)tr->data_size, (u64)tr->offsets_size);
1725
1726         {
1727                 struct binder_transaction_log_entry *fe;
1728
1729                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1730                 *fe = *e;
1731         }
1732
1733         BUG_ON(thread->return_error != BR_OK);
1734         if (in_reply_to) {
1735                 thread->return_error = BR_TRANSACTION_COMPLETE;
1736                 binder_send_failed_reply(in_reply_to, return_error);
1737         } else
1738                 thread->return_error = return_error;
1739 }
1740
1741 static int binder_thread_write(struct binder_proc *proc,
1742                         struct binder_thread *thread,
1743                         binder_uintptr_t binder_buffer, size_t size,
1744                         binder_size_t *consumed)
1745 {
1746         uint32_t cmd;
1747         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1748         void __user *ptr = buffer + *consumed;
1749         void __user *end = buffer + size;
1750
1751         while (ptr < end && thread->return_error == BR_OK) {
1752                 if (get_user(cmd, (uint32_t __user *)ptr))
1753                         return -EFAULT;
1754                 ptr += sizeof(uint32_t);
1755                 trace_binder_command(cmd);
1756                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1757                         binder_stats.bc[_IOC_NR(cmd)]++;
1758                         proc->stats.bc[_IOC_NR(cmd)]++;
1759                         thread->stats.bc[_IOC_NR(cmd)]++;
1760                 }
1761                 switch (cmd) {
1762                 case BC_INCREFS:
1763                 case BC_ACQUIRE:
1764                 case BC_RELEASE:
1765                 case BC_DECREFS: {
1766                         uint32_t target;
1767                         struct binder_ref *ref;
1768                         const char *debug_string;
1769
1770                         if (get_user(target, (uint32_t __user *)ptr))
1771                                 return -EFAULT;
1772                         ptr += sizeof(uint32_t);
1773                         if (target == 0 && binder_context_mgr_node &&
1774                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1775                                 ref = binder_get_ref_for_node(proc,
1776                                                binder_context_mgr_node);
1777                                 if (ref->desc != target) {
1778                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1779                                                 proc->pid, thread->pid,
1780                                                 ref->desc);
1781                                 }
1782                         } else
1783                                 ref = binder_get_ref(proc, target);
1784                         if (ref == NULL) {
1785                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1786                                         proc->pid, thread->pid, target);
1787                                 break;
1788                         }
1789                         switch (cmd) {
1790                         case BC_INCREFS:
1791                                 debug_string = "IncRefs";
1792                                 binder_inc_ref(ref, 0, NULL);
1793                                 break;
1794                         case BC_ACQUIRE:
1795                                 debug_string = "Acquire";
1796                                 binder_inc_ref(ref, 1, NULL);
1797                                 break;
1798                         case BC_RELEASE:
1799                                 debug_string = "Release";
1800                                 binder_dec_ref(ref, 1);
1801                                 break;
1802                         case BC_DECREFS:
1803                         default:
1804                                 debug_string = "DecRefs";
1805                                 binder_dec_ref(ref, 0);
1806                                 break;
1807                         }
1808                         binder_debug(BINDER_DEBUG_USER_REFS,
1809                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1810                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1811                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1812                         break;
1813                 }
1814                 case BC_INCREFS_DONE:
1815                 case BC_ACQUIRE_DONE: {
1816                         binder_uintptr_t node_ptr;
1817                         binder_uintptr_t cookie;
1818                         struct binder_node *node;
1819
1820                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1821                                 return -EFAULT;
1822                         ptr += sizeof(binder_uintptr_t);
1823                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1824                                 return -EFAULT;
1825                         ptr += sizeof(binder_uintptr_t);
1826                         node = binder_get_node(proc, node_ptr);
1827                         if (node == NULL) {
1828                                 binder_user_error("%d:%d %s u%016llx no match\n",
1829                                         proc->pid, thread->pid,
1830                                         cmd == BC_INCREFS_DONE ?
1831                                         "BC_INCREFS_DONE" :
1832                                         "BC_ACQUIRE_DONE",
1833                                         (u64)node_ptr);
1834                                 break;
1835                         }
1836                         if (cookie != node->cookie) {
1837                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1838                                         proc->pid, thread->pid,
1839                                         cmd == BC_INCREFS_DONE ?
1840                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1841                                         (u64)node_ptr, node->debug_id,
1842                                         (u64)cookie, (u64)node->cookie);
1843                                 break;
1844                         }
1845                         if (cmd == BC_ACQUIRE_DONE) {
1846                                 if (node->pending_strong_ref == 0) {
1847                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1848                                                 proc->pid, thread->pid,
1849                                                 node->debug_id);
1850                                         break;
1851                                 }
1852                                 node->pending_strong_ref = 0;
1853                         } else {
1854                                 if (node->pending_weak_ref == 0) {
1855                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1856                                                 proc->pid, thread->pid,
1857                                                 node->debug_id);
1858                                         break;
1859                                 }
1860                                 node->pending_weak_ref = 0;
1861                         }
1862                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1863                         binder_debug(BINDER_DEBUG_USER_REFS,
1864                                      "%d:%d %s node %d ls %d lw %d\n",
1865                                      proc->pid, thread->pid,
1866                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1867                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1868                         break;
1869                 }
1870                 case BC_ATTEMPT_ACQUIRE:
1871                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1872                         return -EINVAL;
1873                 case BC_ACQUIRE_RESULT:
1874                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1875                         return -EINVAL;
1876
1877                 case BC_FREE_BUFFER: {
1878                         binder_uintptr_t data_ptr;
1879                         struct binder_buffer *buffer;
1880
1881                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1882                                 return -EFAULT;
1883                         ptr += sizeof(binder_uintptr_t);
1884
1885                         buffer = binder_buffer_lookup(proc, data_ptr);
1886                         if (buffer == NULL) {
1887                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1888                                         proc->pid, thread->pid, (u64)data_ptr);
1889                                 break;
1890                         }
1891                         if (!buffer->allow_user_free) {
1892                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1893                                         proc->pid, thread->pid, (u64)data_ptr);
1894                                 break;
1895                         }
1896                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1897                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1898                                      proc->pid, thread->pid, (u64)data_ptr,
1899                                      buffer->debug_id,
1900                                      buffer->transaction ? "active" : "finished");
1901
1902                         if (buffer->transaction) {
1903                                 buffer->transaction->buffer = NULL;
1904                                 buffer->transaction = NULL;
1905                         }
1906                         if (buffer->async_transaction && buffer->target_node) {
1907                                 BUG_ON(!buffer->target_node->has_async_transaction);
1908                                 if (list_empty(&buffer->target_node->async_todo))
1909                                         buffer->target_node->has_async_transaction = 0;
1910                                 else
1911                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1912                         }
1913                         trace_binder_transaction_buffer_release(buffer);
1914                         binder_transaction_buffer_release(proc, buffer, NULL);
1915                         binder_free_buf(proc, buffer);
1916                         break;
1917                 }
1918
1919                 case BC_TRANSACTION:
1920                 case BC_REPLY: {
1921                         struct binder_transaction_data tr;
1922
1923                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1924                                 return -EFAULT;
1925                         ptr += sizeof(tr);
1926                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1927                         break;
1928                 }
1929
1930                 case BC_REGISTER_LOOPER:
1931                         binder_debug(BINDER_DEBUG_THREADS,
1932                                      "%d:%d BC_REGISTER_LOOPER\n",
1933                                      proc->pid, thread->pid);
1934                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1935                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1936                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1937                                         proc->pid, thread->pid);
1938                         } else if (proc->requested_threads == 0) {
1939                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1940                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1941                                         proc->pid, thread->pid);
1942                         } else {
1943                                 proc->requested_threads--;
1944                                 proc->requested_threads_started++;
1945                         }
1946                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1947                         break;
1948                 case BC_ENTER_LOOPER:
1949                         binder_debug(BINDER_DEBUG_THREADS,
1950                                      "%d:%d BC_ENTER_LOOPER\n",
1951                                      proc->pid, thread->pid);
1952                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1953                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1954                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1955                                         proc->pid, thread->pid);
1956                         }
1957                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1958                         break;
1959                 case BC_EXIT_LOOPER:
1960                         binder_debug(BINDER_DEBUG_THREADS,
1961                                      "%d:%d BC_EXIT_LOOPER\n",
1962                                      proc->pid, thread->pid);
1963                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1964                         break;
1965
1966                 case BC_REQUEST_DEATH_NOTIFICATION:
1967                 case BC_CLEAR_DEATH_NOTIFICATION: {
1968                         uint32_t target;
1969                         binder_uintptr_t cookie;
1970                         struct binder_ref *ref;
1971                         struct binder_ref_death *death;
1972
1973                         if (get_user(target, (uint32_t __user *)ptr))
1974                                 return -EFAULT;
1975                         ptr += sizeof(uint32_t);
1976                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1977                                 return -EFAULT;
1978                         ptr += sizeof(binder_uintptr_t);
1979                         ref = binder_get_ref(proc, target);
1980                         if (ref == NULL) {
1981                                 binder_user_error("%d:%d %s invalid ref %d\n",
1982                                         proc->pid, thread->pid,
1983                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1984                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1985                                         "BC_CLEAR_DEATH_NOTIFICATION",
1986                                         target);
1987                                 break;
1988                         }
1989
1990                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1991                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
1992                                      proc->pid, thread->pid,
1993                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1994                                      "BC_REQUEST_DEATH_NOTIFICATION" :
1995                                      "BC_CLEAR_DEATH_NOTIFICATION",
1996                                      (u64)cookie, ref->debug_id, ref->desc,
1997                                      ref->strong, ref->weak, ref->node->debug_id);
1998
1999                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2000                                 if (ref->death) {
2001                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2002                                                 proc->pid, thread->pid);
2003                                         break;
2004                                 }
2005                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2006                                 if (death == NULL) {
2007                                         thread->return_error = BR_ERROR;
2008                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2009                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2010                                                      proc->pid, thread->pid);
2011                                         break;
2012                                 }
2013                                 binder_stats_created(BINDER_STAT_DEATH);
2014                                 INIT_LIST_HEAD(&death->work.entry);
2015                                 death->cookie = cookie;
2016                                 ref->death = death;
2017                                 if (ref->node->proc == NULL) {
2018                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2019                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2020                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2021                                         } else {
2022                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2023                                                 wake_up_interruptible(&proc->wait);
2024                                         }
2025                                 }
2026                         } else {
2027                                 if (ref->death == NULL) {
2028                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2029                                                 proc->pid, thread->pid);
2030                                         break;
2031                                 }
2032                                 death = ref->death;
2033                                 if (death->cookie != cookie) {
2034                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2035                                                 proc->pid, thread->pid,
2036                                                 (u64)death->cookie,
2037                                                 (u64)cookie);
2038                                         break;
2039                                 }
2040                                 ref->death = NULL;
2041                                 if (list_empty(&death->work.entry)) {
2042                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2043                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2044                                                 list_add_tail(&death->work.entry, &thread->todo);
2045                                         } else {
2046                                                 list_add_tail(&death->work.entry, &proc->todo);
2047                                                 wake_up_interruptible(&proc->wait);
2048                                         }
2049                                 } else {
2050                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2051                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2052                                 }
2053                         }
2054                 } break;
2055                 case BC_DEAD_BINDER_DONE: {
2056                         struct binder_work *w;
2057                         binder_uintptr_t cookie;
2058                         struct binder_ref_death *death = NULL;
2059
2060                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2061                                 return -EFAULT;
2062
2063                         ptr += sizeof(void *);
2064                         list_for_each_entry(w, &proc->delivered_death, entry) {
2065                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2066
2067                                 if (tmp_death->cookie == cookie) {
2068                                         death = tmp_death;
2069                                         break;
2070                                 }
2071                         }
2072                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2073                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2074                                      proc->pid, thread->pid, (u64)cookie,
2075                                      death);
2076                         if (death == NULL) {
2077                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2078                                         proc->pid, thread->pid, (u64)cookie);
2079                                 break;
2080                         }
2081
2082                         list_del_init(&death->work.entry);
2083                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2084                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2085                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2086                                         list_add_tail(&death->work.entry, &thread->todo);
2087                                 } else {
2088                                         list_add_tail(&death->work.entry, &proc->todo);
2089                                         wake_up_interruptible(&proc->wait);
2090                                 }
2091                         }
2092                 } break;
2093
2094                 default:
2095                         pr_err("%d:%d unknown command %d\n",
2096                                proc->pid, thread->pid, cmd);
2097                         return -EINVAL;
2098                 }
2099                 *consumed = ptr - buffer;
2100         }
2101         return 0;
2102 }
2103
2104 static void binder_stat_br(struct binder_proc *proc,
2105                            struct binder_thread *thread, uint32_t cmd)
2106 {
2107         trace_binder_return(cmd);
2108         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2109                 binder_stats.br[_IOC_NR(cmd)]++;
2110                 proc->stats.br[_IOC_NR(cmd)]++;
2111                 thread->stats.br[_IOC_NR(cmd)]++;
2112         }
2113 }
2114
2115 static int binder_has_proc_work(struct binder_proc *proc,
2116                                 struct binder_thread *thread)
2117 {
2118         return !list_empty(&proc->todo) ||
2119                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2120 }
2121
2122 static int binder_has_thread_work(struct binder_thread *thread)
2123 {
2124         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2125                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2126 }
2127
2128 static int binder_thread_read(struct binder_proc *proc,
2129                               struct binder_thread *thread,
2130                               binder_uintptr_t binder_buffer, size_t size,
2131                               binder_size_t *consumed, int non_block)
2132 {
2133         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2134         void __user *ptr = buffer + *consumed;
2135         void __user *end = buffer + size;
2136
2137         int ret = 0;
2138         int wait_for_proc_work;
2139
2140         if (*consumed == 0) {
2141                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2142                         return -EFAULT;
2143                 ptr += sizeof(uint32_t);
2144         }
2145
2146 retry:
2147         wait_for_proc_work = thread->transaction_stack == NULL &&
2148                                 list_empty(&thread->todo);
2149
2150         if (thread->return_error != BR_OK && ptr < end) {
2151                 if (thread->return_error2 != BR_OK) {
2152                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2153                                 return -EFAULT;
2154                         ptr += sizeof(uint32_t);
2155                         binder_stat_br(proc, thread, thread->return_error2);
2156                         if (ptr == end)
2157                                 goto done;
2158                         thread->return_error2 = BR_OK;
2159                 }
2160                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2161                         return -EFAULT;
2162                 ptr += sizeof(uint32_t);
2163                 binder_stat_br(proc, thread, thread->return_error);
2164                 thread->return_error = BR_OK;
2165                 goto done;
2166         }
2167
2168
2169         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2170         if (wait_for_proc_work)
2171                 proc->ready_threads++;
2172
2173         binder_unlock(__func__);
2174
2175         trace_binder_wait_for_work(wait_for_proc_work,
2176                                    !!thread->transaction_stack,
2177                                    !list_empty(&thread->todo));
2178         if (wait_for_proc_work) {
2179                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2180                                         BINDER_LOOPER_STATE_ENTERED))) {
2181                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2182                                 proc->pid, thread->pid, thread->looper);
2183                         wait_event_interruptible(binder_user_error_wait,
2184                                                  binder_stop_on_user_error < 2);
2185                 }
2186                 binder_set_nice(proc->default_priority);
2187                 if (non_block) {
2188                         if (!binder_has_proc_work(proc, thread))
2189                                 ret = -EAGAIN;
2190                 } else
2191                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2192         } else {
2193                 if (non_block) {
2194                         if (!binder_has_thread_work(thread))
2195                                 ret = -EAGAIN;
2196                 } else
2197                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2198         }
2199
2200         binder_lock(__func__);
2201
2202         if (wait_for_proc_work)
2203                 proc->ready_threads--;
2204         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2205
2206         if (ret)
2207                 return ret;
2208
2209         while (1) {
2210                 uint32_t cmd;
2211                 struct binder_transaction_data tr;
2212                 struct binder_work *w;
2213                 struct binder_transaction *t = NULL;
2214
2215                 if (!list_empty(&thread->todo)) {
2216                         w = list_first_entry(&thread->todo, struct binder_work,
2217                                              entry);
2218                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2219                         w = list_first_entry(&proc->todo, struct binder_work,
2220                                              entry);
2221                 } else {
2222                         /* no data added */
2223                         if (ptr - buffer == 4 &&
2224                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2225                                 goto retry;
2226                         break;
2227                 }
2228
2229                 if (end - ptr < sizeof(tr) + 4)
2230                         break;
2231
2232                 switch (w->type) {
2233                 case BINDER_WORK_TRANSACTION: {
2234                         t = container_of(w, struct binder_transaction, work);
2235                 } break;
2236                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2237                         cmd = BR_TRANSACTION_COMPLETE;
2238                         if (put_user(cmd, (uint32_t __user *)ptr))
2239                                 return -EFAULT;
2240                         ptr += sizeof(uint32_t);
2241
2242                         binder_stat_br(proc, thread, cmd);
2243                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2244                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2245                                      proc->pid, thread->pid);
2246
2247                         list_del(&w->entry);
2248                         kfree(w);
2249                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2250                 } break;
2251                 case BINDER_WORK_NODE: {
2252                         struct binder_node *node = container_of(w, struct binder_node, work);
2253                         uint32_t cmd = BR_NOOP;
2254                         const char *cmd_name;
2255                         int strong = node->internal_strong_refs || node->local_strong_refs;
2256                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2257
2258                         if (weak && !node->has_weak_ref) {
2259                                 cmd = BR_INCREFS;
2260                                 cmd_name = "BR_INCREFS";
2261                                 node->has_weak_ref = 1;
2262                                 node->pending_weak_ref = 1;
2263                                 node->local_weak_refs++;
2264                         } else if (strong && !node->has_strong_ref) {
2265                                 cmd = BR_ACQUIRE;
2266                                 cmd_name = "BR_ACQUIRE";
2267                                 node->has_strong_ref = 1;
2268                                 node->pending_strong_ref = 1;
2269                                 node->local_strong_refs++;
2270                         } else if (!strong && node->has_strong_ref) {
2271                                 cmd = BR_RELEASE;
2272                                 cmd_name = "BR_RELEASE";
2273                                 node->has_strong_ref = 0;
2274                         } else if (!weak && node->has_weak_ref) {
2275                                 cmd = BR_DECREFS;
2276                                 cmd_name = "BR_DECREFS";
2277                                 node->has_weak_ref = 0;
2278                         }
2279                         if (cmd != BR_NOOP) {
2280                                 if (put_user(cmd, (uint32_t __user *)ptr))
2281                                         return -EFAULT;
2282                                 ptr += sizeof(uint32_t);
2283                                 if (put_user(node->ptr,
2284                                              (binder_uintptr_t __user *)ptr))
2285                                         return -EFAULT;
2286                                 ptr += sizeof(binder_uintptr_t);
2287                                 if (put_user(node->cookie,
2288                                              (binder_uintptr_t __user *)ptr))
2289                                         return -EFAULT;
2290                                 ptr += sizeof(binder_uintptr_t);
2291
2292                                 binder_stat_br(proc, thread, cmd);
2293                                 binder_debug(BINDER_DEBUG_USER_REFS,
2294                                              "%d:%d %s %d u%016llx c%016llx\n",
2295                                              proc->pid, thread->pid, cmd_name,
2296                                              node->debug_id,
2297                                              (u64)node->ptr, (u64)node->cookie);
2298                         } else {
2299                                 list_del_init(&w->entry);
2300                                 if (!weak && !strong) {
2301                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2302                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2303                                                      proc->pid, thread->pid,
2304                                                      node->debug_id,
2305                                                      (u64)node->ptr,
2306                                                      (u64)node->cookie);
2307                                         rb_erase(&node->rb_node, &proc->nodes);
2308                                         kfree(node);
2309                                         binder_stats_deleted(BINDER_STAT_NODE);
2310                                 } else {
2311                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2312                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2313                                                      proc->pid, thread->pid,
2314                                                      node->debug_id,
2315                                                      (u64)node->ptr,
2316                                                      (u64)node->cookie);
2317                                 }
2318                         }
2319                 } break;
2320                 case BINDER_WORK_DEAD_BINDER:
2321                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2322                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2323                         struct binder_ref_death *death;
2324                         uint32_t cmd;
2325
2326                         death = container_of(w, struct binder_ref_death, work);
2327                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2328                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2329                         else
2330                                 cmd = BR_DEAD_BINDER;
2331                         if (put_user(cmd, (uint32_t __user *)ptr))
2332                                 return -EFAULT;
2333                         ptr += sizeof(uint32_t);
2334                         if (put_user(death->cookie,
2335                                      (binder_uintptr_t __user *)ptr))
2336                                 return -EFAULT;
2337                         ptr += sizeof(binder_uintptr_t);
2338                         binder_stat_br(proc, thread, cmd);
2339                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2340                                      "%d:%d %s %016llx\n",
2341                                       proc->pid, thread->pid,
2342                                       cmd == BR_DEAD_BINDER ?
2343                                       "BR_DEAD_BINDER" :
2344                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2345                                       (u64)death->cookie);
2346
2347                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2348                                 list_del(&w->entry);
2349                                 kfree(death);
2350                                 binder_stats_deleted(BINDER_STAT_DEATH);
2351                         } else
2352                                 list_move(&w->entry, &proc->delivered_death);
2353                         if (cmd == BR_DEAD_BINDER)
2354                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2355                 } break;
2356                 }
2357
2358                 if (!t)
2359                         continue;
2360
2361                 BUG_ON(t->buffer == NULL);
2362                 if (t->buffer->target_node) {
2363                         struct binder_node *target_node = t->buffer->target_node;
2364
2365                         tr.target.ptr = target_node->ptr;
2366                         tr.cookie =  target_node->cookie;
2367                         t->saved_priority = task_nice(current);
2368                         if (t->priority < target_node->min_priority &&
2369                             !(t->flags & TF_ONE_WAY))
2370                                 binder_set_nice(t->priority);
2371                         else if (!(t->flags & TF_ONE_WAY) ||
2372                                  t->saved_priority > target_node->min_priority)
2373                                 binder_set_nice(target_node->min_priority);
2374                         cmd = BR_TRANSACTION;
2375                 } else {
2376                         tr.target.ptr = 0;
2377                         tr.cookie = 0;
2378                         cmd = BR_REPLY;
2379                 }
2380                 tr.code = t->code;
2381                 tr.flags = t->flags;
2382                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2383
2384                 if (t->from) {
2385                         struct task_struct *sender = t->from->proc->tsk;
2386
2387                         tr.sender_pid = task_tgid_nr_ns(sender,
2388                                                         task_active_pid_ns(current));
2389                 } else {
2390                         tr.sender_pid = 0;
2391                 }
2392
2393                 tr.data_size = t->buffer->data_size;
2394                 tr.offsets_size = t->buffer->offsets_size;
2395                 tr.data.ptr.buffer = (binder_uintptr_t)(
2396                                         (uintptr_t)t->buffer->data +
2397                                         proc->user_buffer_offset);
2398                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2399                                         ALIGN(t->buffer->data_size,
2400                                             sizeof(void *));
2401
2402                 if (put_user(cmd, (uint32_t __user *)ptr))
2403                         return -EFAULT;
2404                 ptr += sizeof(uint32_t);
2405                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2406                         return -EFAULT;
2407                 ptr += sizeof(tr);
2408
2409                 trace_binder_transaction_received(t);
2410                 binder_stat_br(proc, thread, cmd);
2411                 binder_debug(BINDER_DEBUG_TRANSACTION,
2412                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2413                              proc->pid, thread->pid,
2414                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2415                              "BR_REPLY",
2416                              t->debug_id, t->from ? t->from->proc->pid : 0,
2417                              t->from ? t->from->pid : 0, cmd,
2418                              t->buffer->data_size, t->buffer->offsets_size,
2419                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2420
2421                 list_del(&t->work.entry);
2422                 t->buffer->allow_user_free = 1;
2423                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2424                         t->to_parent = thread->transaction_stack;
2425                         t->to_thread = thread;
2426                         thread->transaction_stack = t;
2427                 } else {
2428                         t->buffer->transaction = NULL;
2429                         kfree(t);
2430                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2431                 }
2432                 break;
2433         }
2434
2435 done:
2436
2437         *consumed = ptr - buffer;
2438         if (proc->requested_threads + proc->ready_threads == 0 &&
2439             proc->requested_threads_started < proc->max_threads &&
2440             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2441              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2442              /*spawn a new thread if we leave this out */) {
2443                 proc->requested_threads++;
2444                 binder_debug(BINDER_DEBUG_THREADS,
2445                              "%d:%d BR_SPAWN_LOOPER\n",
2446                              proc->pid, thread->pid);
2447                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2448                         return -EFAULT;
2449                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2450         }
2451         return 0;
2452 }
2453
2454 static void binder_release_work(struct list_head *list)
2455 {
2456         struct binder_work *w;
2457
2458         while (!list_empty(list)) {
2459                 w = list_first_entry(list, struct binder_work, entry);
2460                 list_del_init(&w->entry);
2461                 switch (w->type) {
2462                 case BINDER_WORK_TRANSACTION: {
2463                         struct binder_transaction *t;
2464
2465                         t = container_of(w, struct binder_transaction, work);
2466                         if (t->buffer->target_node &&
2467                             !(t->flags & TF_ONE_WAY)) {
2468                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2469                         } else {
2470                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2471                                         "undelivered transaction %d\n",
2472                                         t->debug_id);
2473                                 t->buffer->transaction = NULL;
2474                                 kfree(t);
2475                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2476                         }
2477                 } break;
2478                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2479                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2480                                 "undelivered TRANSACTION_COMPLETE\n");
2481                         kfree(w);
2482                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2483                 } break;
2484                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2485                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2486                         struct binder_ref_death *death;
2487
2488                         death = container_of(w, struct binder_ref_death, work);
2489                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2490                                 "undelivered death notification, %016llx\n",
2491                                 (u64)death->cookie);
2492                         kfree(death);
2493                         binder_stats_deleted(BINDER_STAT_DEATH);
2494                 } break;
2495                 default:
2496                         pr_err("unexpected work type, %d, not freed\n",
2497                                w->type);
2498                         break;
2499                 }
2500         }
2501
2502 }
2503
2504 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2505 {
2506         struct binder_thread *thread = NULL;
2507         struct rb_node *parent = NULL;
2508         struct rb_node **p = &proc->threads.rb_node;
2509
2510         while (*p) {
2511                 parent = *p;
2512                 thread = rb_entry(parent, struct binder_thread, rb_node);
2513
2514                 if (current->pid < thread->pid)
2515                         p = &(*p)->rb_left;
2516                 else if (current->pid > thread->pid)
2517                         p = &(*p)->rb_right;
2518                 else
2519                         break;
2520         }
2521         if (*p == NULL) {
2522                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2523                 if (thread == NULL)
2524                         return NULL;
2525                 binder_stats_created(BINDER_STAT_THREAD);
2526                 thread->proc = proc;
2527                 thread->pid = current->pid;
2528                 init_waitqueue_head(&thread->wait);
2529                 INIT_LIST_HEAD(&thread->todo);
2530                 rb_link_node(&thread->rb_node, parent, p);
2531                 rb_insert_color(&thread->rb_node, &proc->threads);
2532                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2533                 thread->return_error = BR_OK;
2534                 thread->return_error2 = BR_OK;
2535         }
2536         return thread;
2537 }
2538
2539 static int binder_free_thread(struct binder_proc *proc,
2540                               struct binder_thread *thread)
2541 {
2542         struct binder_transaction *t;
2543         struct binder_transaction *send_reply = NULL;
2544         int active_transactions = 0;
2545
2546         rb_erase(&thread->rb_node, &proc->threads);
2547         t = thread->transaction_stack;
2548         if (t && t->to_thread == thread)
2549                 send_reply = t;
2550         while (t) {
2551                 active_transactions++;
2552                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2553                              "release %d:%d transaction %d %s, still active\n",
2554                               proc->pid, thread->pid,
2555                              t->debug_id,
2556                              (t->to_thread == thread) ? "in" : "out");
2557
2558                 if (t->to_thread == thread) {
2559                         t->to_proc = NULL;
2560                         t->to_thread = NULL;
2561                         if (t->buffer) {
2562                                 t->buffer->transaction = NULL;
2563                                 t->buffer = NULL;
2564                         }
2565                         t = t->to_parent;
2566                 } else if (t->from == thread) {
2567                         t->from = NULL;
2568                         t = t->from_parent;
2569                 } else
2570                         BUG();
2571         }
2572         if (send_reply)
2573                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2574         binder_release_work(&thread->todo);
2575         kfree(thread);
2576         binder_stats_deleted(BINDER_STAT_THREAD);
2577         return active_transactions;
2578 }
2579
2580 static unsigned int binder_poll(struct file *filp,
2581                                 struct poll_table_struct *wait)
2582 {
2583         struct binder_proc *proc = filp->private_data;
2584         struct binder_thread *thread = NULL;
2585         int wait_for_proc_work;
2586
2587         binder_lock(__func__);
2588
2589         thread = binder_get_thread(proc);
2590
2591         wait_for_proc_work = thread->transaction_stack == NULL &&
2592                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2593
2594         binder_unlock(__func__);
2595
2596         if (wait_for_proc_work) {
2597                 if (binder_has_proc_work(proc, thread))
2598                         return POLLIN;
2599                 poll_wait(filp, &proc->wait, wait);
2600                 if (binder_has_proc_work(proc, thread))
2601                         return POLLIN;
2602         } else {
2603                 if (binder_has_thread_work(thread))
2604                         return POLLIN;
2605                 poll_wait(filp, &thread->wait, wait);
2606                 if (binder_has_thread_work(thread))
2607                         return POLLIN;
2608         }
2609         return 0;
2610 }
2611
2612 static int binder_ioctl_write_read(struct file *filp,
2613                                 unsigned int cmd, unsigned long arg,
2614                                 struct binder_thread *thread)
2615 {
2616         int ret = 0;
2617         struct binder_proc *proc = filp->private_data;
2618         unsigned int size = _IOC_SIZE(cmd);
2619         void __user *ubuf = (void __user *)arg;
2620         struct binder_write_read bwr;
2621
2622         if (size != sizeof(struct binder_write_read)) {
2623                 ret = -EINVAL;
2624                 goto out;
2625         }
2626         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2627                 ret = -EFAULT;
2628                 goto out;
2629         }
2630         binder_debug(BINDER_DEBUG_READ_WRITE,
2631                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2632                      proc->pid, thread->pid,
2633                      (u64)bwr.write_size, (u64)bwr.write_buffer,
2634                      (u64)bwr.read_size, (u64)bwr.read_buffer);
2635
2636         if (bwr.write_size > 0) {
2637                 ret = binder_thread_write(proc, thread,
2638                                           bwr.write_buffer,
2639                                           bwr.write_size,
2640                                           &bwr.write_consumed);
2641                 trace_binder_write_done(ret);
2642                 if (ret < 0) {
2643                         bwr.read_consumed = 0;
2644                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2645                                 ret = -EFAULT;
2646                         goto out;
2647                 }
2648         }
2649         if (bwr.read_size > 0) {
2650                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2651                                          bwr.read_size,
2652                                          &bwr.read_consumed,
2653                                          filp->f_flags & O_NONBLOCK);
2654                 trace_binder_read_done(ret);
2655                 if (!list_empty(&proc->todo))
2656                         wake_up_interruptible(&proc->wait);
2657                 if (ret < 0) {
2658                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2659                                 ret = -EFAULT;
2660                         goto out;
2661                 }
2662         }
2663         binder_debug(BINDER_DEBUG_READ_WRITE,
2664                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2665                      proc->pid, thread->pid,
2666                      (u64)bwr.write_consumed, (u64)bwr.write_size,
2667                      (u64)bwr.read_consumed, (u64)bwr.read_size);
2668         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2669                 ret = -EFAULT;
2670                 goto out;
2671         }
2672 out:
2673         return ret;
2674 }
2675
2676 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2677 {
2678         int ret = 0;
2679         struct binder_proc *proc = filp->private_data;
2680         kuid_t curr_euid = current_euid();
2681
2682         if (binder_context_mgr_node != NULL) {
2683                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2684                 ret = -EBUSY;
2685                 goto out;
2686         }
2687         if (uid_valid(binder_context_mgr_uid)) {
2688                 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2689                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2690                                from_kuid(&init_user_ns, curr_euid),
2691                                from_kuid(&init_user_ns,
2692                                         binder_context_mgr_uid));
2693                         ret = -EPERM;
2694                         goto out;
2695                 }
2696         } else {
2697                 binder_context_mgr_uid = curr_euid;
2698         }
2699         binder_context_mgr_node = binder_new_node(proc, 0, 0);
2700         if (binder_context_mgr_node == NULL) {
2701                 ret = -ENOMEM;
2702                 goto out;
2703         }
2704         binder_context_mgr_node->local_weak_refs++;
2705         binder_context_mgr_node->local_strong_refs++;
2706         binder_context_mgr_node->has_strong_ref = 1;
2707         binder_context_mgr_node->has_weak_ref = 1;
2708 out:
2709         return ret;
2710 }
2711
2712 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2713 {
2714         int ret;
2715         struct binder_proc *proc = filp->private_data;
2716         struct binder_thread *thread;
2717         unsigned int size = _IOC_SIZE(cmd);
2718         void __user *ubuf = (void __user *)arg;
2719
2720         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2721                         proc->pid, current->pid, cmd, arg);*/
2722
2723         trace_binder_ioctl(cmd, arg);
2724
2725         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2726         if (ret)
2727                 goto err_unlocked;
2728
2729         binder_lock(__func__);
2730         thread = binder_get_thread(proc);
2731         if (thread == NULL) {
2732                 ret = -ENOMEM;
2733                 goto err;
2734         }
2735
2736         switch (cmd) {
2737         case BINDER_WRITE_READ:
2738                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2739                 if (ret)
2740                         goto err;
2741                 break;
2742         case BINDER_SET_MAX_THREADS:
2743                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2744                         ret = -EINVAL;
2745                         goto err;
2746                 }
2747                 break;
2748         case BINDER_SET_CONTEXT_MGR:
2749                 ret = binder_ioctl_set_ctx_mgr(filp);
2750                 if (ret)
2751                         goto err;
2752                 break;
2753         case BINDER_THREAD_EXIT:
2754                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2755                              proc->pid, thread->pid);
2756                 binder_free_thread(proc, thread);
2757                 thread = NULL;
2758                 break;
2759         case BINDER_VERSION: {
2760                 struct binder_version __user *ver = ubuf;
2761
2762                 if (size != sizeof(struct binder_version)) {
2763                         ret = -EINVAL;
2764                         goto err;
2765                 }
2766                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2767                              &ver->protocol_version)) {
2768                         ret = -EINVAL;
2769                         goto err;
2770                 }
2771                 break;
2772         }
2773         default:
2774                 ret = -EINVAL;
2775                 goto err;
2776         }
2777         ret = 0;
2778 err:
2779         if (thread)
2780                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2781         binder_unlock(__func__);
2782         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2783         if (ret && ret != -ERESTARTSYS)
2784                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2785 err_unlocked:
2786         trace_binder_ioctl_done(ret);
2787         return ret;
2788 }
2789
2790 static void binder_vma_open(struct vm_area_struct *vma)
2791 {
2792         struct binder_proc *proc = vma->vm_private_data;
2793
2794         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2795                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2796                      proc->pid, vma->vm_start, vma->vm_end,
2797                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2798                      (unsigned long)pgprot_val(vma->vm_page_prot));
2799 }
2800
2801 static void binder_vma_close(struct vm_area_struct *vma)
2802 {
2803         struct binder_proc *proc = vma->vm_private_data;
2804
2805         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2806                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2807                      proc->pid, vma->vm_start, vma->vm_end,
2808                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2809                      (unsigned long)pgprot_val(vma->vm_page_prot));
2810         proc->vma = NULL;
2811         proc->vma_vm_mm = NULL;
2812         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2813 }
2814
2815 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2816 {
2817         return VM_FAULT_SIGBUS;
2818 }
2819
2820 static struct vm_operations_struct binder_vm_ops = {
2821         .open = binder_vma_open,
2822         .close = binder_vma_close,
2823         .fault = binder_vm_fault,
2824 };
2825
2826 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2827 {
2828         int ret;
2829         struct vm_struct *area;
2830         struct binder_proc *proc = filp->private_data;
2831         const char *failure_string;
2832         struct binder_buffer *buffer;
2833
2834         if (proc->tsk != current)
2835                 return -EINVAL;
2836
2837         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2838                 vma->vm_end = vma->vm_start + SZ_4M;
2839
2840         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2841                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2842                      proc->pid, vma->vm_start, vma->vm_end,
2843                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2844                      (unsigned long)pgprot_val(vma->vm_page_prot));
2845
2846         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2847                 ret = -EPERM;
2848                 failure_string = "bad vm_flags";
2849                 goto err_bad_arg;
2850         }
2851         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2852
2853         mutex_lock(&binder_mmap_lock);
2854         if (proc->buffer) {
2855                 ret = -EBUSY;
2856                 failure_string = "already mapped";
2857                 goto err_already_mapped;
2858         }
2859
2860         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2861         if (area == NULL) {
2862                 ret = -ENOMEM;
2863                 failure_string = "get_vm_area";
2864                 goto err_get_vm_area_failed;
2865         }
2866         proc->buffer = area->addr;
2867         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2868         mutex_unlock(&binder_mmap_lock);
2869
2870 #ifdef CONFIG_CPU_CACHE_VIPT
2871         if (cache_is_vipt_aliasing()) {
2872                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2873                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2874                         vma->vm_start += PAGE_SIZE;
2875                 }
2876         }
2877 #endif
2878         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2879         if (proc->pages == NULL) {
2880                 ret = -ENOMEM;
2881                 failure_string = "alloc page array";
2882                 goto err_alloc_pages_failed;
2883         }
2884         proc->buffer_size = vma->vm_end - vma->vm_start;
2885
2886         vma->vm_ops = &binder_vm_ops;
2887         vma->vm_private_data = proc;
2888
2889         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2890                 ret = -ENOMEM;
2891                 failure_string = "alloc small buf";
2892                 goto err_alloc_small_buf_failed;
2893         }
2894         buffer = proc->buffer;
2895         INIT_LIST_HEAD(&proc->buffers);
2896         list_add(&buffer->entry, &proc->buffers);
2897         buffer->free = 1;
2898         binder_insert_free_buffer(proc, buffer);
2899         proc->free_async_space = proc->buffer_size / 2;
2900         barrier();
2901         proc->files = get_files_struct(current);
2902         proc->vma = vma;
2903         proc->vma_vm_mm = vma->vm_mm;
2904
2905         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2906                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2907         return 0;
2908
2909 err_alloc_small_buf_failed:
2910         kfree(proc->pages);
2911         proc->pages = NULL;
2912 err_alloc_pages_failed:
2913         mutex_lock(&binder_mmap_lock);
2914         vfree(proc->buffer);
2915         proc->buffer = NULL;
2916 err_get_vm_area_failed:
2917 err_already_mapped:
2918         mutex_unlock(&binder_mmap_lock);
2919 err_bad_arg:
2920         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2921                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2922         return ret;
2923 }
2924
2925 static int binder_open(struct inode *nodp, struct file *filp)
2926 {
2927         struct binder_proc *proc;
2928
2929         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2930                      current->group_leader->pid, current->pid);
2931
2932         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2933         if (proc == NULL)
2934                 return -ENOMEM;
2935         get_task_struct(current);
2936         proc->tsk = current;
2937         INIT_LIST_HEAD(&proc->todo);
2938         init_waitqueue_head(&proc->wait);
2939         proc->default_priority = task_nice(current);
2940
2941         binder_lock(__func__);
2942
2943         binder_stats_created(BINDER_STAT_PROC);
2944         hlist_add_head(&proc->proc_node, &binder_procs);
2945         proc->pid = current->group_leader->pid;
2946         INIT_LIST_HEAD(&proc->delivered_death);
2947         filp->private_data = proc;
2948
2949         binder_unlock(__func__);
2950
2951         if (binder_debugfs_dir_entry_proc) {
2952                 char strbuf[11];
2953
2954                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2955                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2956                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2957         }
2958
2959         return 0;
2960 }
2961
2962 static int binder_flush(struct file *filp, fl_owner_t id)
2963 {
2964         struct binder_proc *proc = filp->private_data;
2965
2966         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2967
2968         return 0;
2969 }
2970
2971 static void binder_deferred_flush(struct binder_proc *proc)
2972 {
2973         struct rb_node *n;
2974         int wake_count = 0;
2975
2976         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2977                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2978
2979                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2980                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2981                         wake_up_interruptible(&thread->wait);
2982                         wake_count++;
2983                 }
2984         }
2985         wake_up_interruptible_all(&proc->wait);
2986
2987         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2988                      "binder_flush: %d woke %d threads\n", proc->pid,
2989                      wake_count);
2990 }
2991
2992 static int binder_release(struct inode *nodp, struct file *filp)
2993 {
2994         struct binder_proc *proc = filp->private_data;
2995
2996         debugfs_remove(proc->debugfs_entry);
2997         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2998
2999         return 0;
3000 }
3001
3002 static int binder_node_release(struct binder_node *node, int refs)
3003 {
3004         struct binder_ref *ref;
3005         int death = 0;
3006
3007         list_del_init(&node->work.entry);
3008         binder_release_work(&node->async_todo);
3009
3010         if (hlist_empty(&node->refs)) {
3011                 kfree(node);
3012                 binder_stats_deleted(BINDER_STAT_NODE);
3013
3014                 return refs;
3015         }
3016
3017         node->proc = NULL;
3018         node->local_strong_refs = 0;
3019         node->local_weak_refs = 0;
3020         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3021
3022         hlist_for_each_entry(ref, &node->refs, node_entry) {
3023                 refs++;
3024
3025                 if (!ref->death)
3026                         continue;
3027
3028                 death++;
3029
3030                 if (list_empty(&ref->death->work.entry)) {
3031                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3032                         list_add_tail(&ref->death->work.entry,
3033                                       &ref->proc->todo);
3034                         wake_up_interruptible(&ref->proc->wait);
3035                 } else
3036                         BUG();
3037         }
3038
3039         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3040                      "node %d now dead, refs %d, death %d\n",
3041                      node->debug_id, refs, death);
3042
3043         return refs;
3044 }
3045
3046 static void binder_deferred_release(struct binder_proc *proc)
3047 {
3048         struct binder_transaction *t;
3049         struct rb_node *n;
3050         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3051                 active_transactions, page_count;
3052
3053         BUG_ON(proc->vma);
3054         BUG_ON(proc->files);
3055
3056         hlist_del(&proc->proc_node);
3057
3058         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3059                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3060                              "%s: %d context_mgr_node gone\n",
3061                              __func__, proc->pid);
3062                 binder_context_mgr_node = NULL;
3063         }
3064
3065         threads = 0;
3066         active_transactions = 0;
3067         while ((n = rb_first(&proc->threads))) {
3068                 struct binder_thread *thread;
3069
3070                 thread = rb_entry(n, struct binder_thread, rb_node);
3071                 threads++;
3072                 active_transactions += binder_free_thread(proc, thread);
3073         }
3074
3075         nodes = 0;
3076         incoming_refs = 0;
3077         while ((n = rb_first(&proc->nodes))) {
3078                 struct binder_node *node;
3079
3080                 node = rb_entry(n, struct binder_node, rb_node);
3081                 nodes++;
3082                 rb_erase(&node->rb_node, &proc->nodes);
3083                 incoming_refs = binder_node_release(node, incoming_refs);
3084         }
3085
3086         outgoing_refs = 0;
3087         while ((n = rb_first(&proc->refs_by_desc))) {
3088                 struct binder_ref *ref;
3089
3090                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3091                 outgoing_refs++;
3092                 binder_delete_ref(ref);
3093         }
3094
3095         binder_release_work(&proc->todo);
3096         binder_release_work(&proc->delivered_death);
3097
3098         buffers = 0;
3099         while ((n = rb_first(&proc->allocated_buffers))) {
3100                 struct binder_buffer *buffer;
3101
3102                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3103
3104                 t = buffer->transaction;
3105                 if (t) {
3106                         t->buffer = NULL;
3107                         buffer->transaction = NULL;
3108                         pr_err("release proc %d, transaction %d, not freed\n",
3109                                proc->pid, t->debug_id);
3110                         /*BUG();*/
3111                 }
3112
3113                 binder_free_buf(proc, buffer);
3114                 buffers++;
3115         }
3116
3117         binder_stats_deleted(BINDER_STAT_PROC);
3118
3119         page_count = 0;
3120         if (proc->pages) {
3121                 int i;
3122
3123                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3124                         void *page_addr;
3125
3126                         if (!proc->pages[i])
3127                                 continue;
3128
3129                         page_addr = proc->buffer + i * PAGE_SIZE;
3130                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3131                                      "%s: %d: page %d at %p not freed\n",
3132                                      __func__, proc->pid, i, page_addr);
3133                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3134                         __free_page(proc->pages[i]);
3135                         page_count++;
3136                 }
3137                 kfree(proc->pages);
3138                 vfree(proc->buffer);
3139         }
3140
3141         put_task_struct(proc->tsk);
3142
3143         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3144                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3145                      __func__, proc->pid, threads, nodes, incoming_refs,
3146                      outgoing_refs, active_transactions, buffers, page_count);
3147
3148         kfree(proc);
3149 }
3150
3151 static void binder_deferred_func(struct work_struct *work)
3152 {
3153         struct binder_proc *proc;
3154         struct files_struct *files;
3155
3156         int defer;
3157
3158         do {
3159                 binder_lock(__func__);
3160                 mutex_lock(&binder_deferred_lock);
3161                 if (!hlist_empty(&binder_deferred_list)) {
3162                         proc = hlist_entry(binder_deferred_list.first,
3163                                         struct binder_proc, deferred_work_node);
3164                         hlist_del_init(&proc->deferred_work_node);
3165                         defer = proc->deferred_work;
3166                         proc->deferred_work = 0;
3167                 } else {
3168                         proc = NULL;
3169                         defer = 0;
3170                 }
3171                 mutex_unlock(&binder_deferred_lock);
3172
3173                 files = NULL;
3174                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3175                         files = proc->files;
3176                         if (files)
3177                                 proc->files = NULL;
3178                 }
3179
3180                 if (defer & BINDER_DEFERRED_FLUSH)
3181                         binder_deferred_flush(proc);
3182
3183                 if (defer & BINDER_DEFERRED_RELEASE)
3184                         binder_deferred_release(proc); /* frees proc */
3185
3186                 binder_unlock(__func__);
3187                 if (files)
3188                         put_files_struct(files);
3189         } while (proc);
3190 }
3191 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3192
3193 static void
3194 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3195 {
3196         mutex_lock(&binder_deferred_lock);
3197         proc->deferred_work |= defer;
3198         if (hlist_unhashed(&proc->deferred_work_node)) {
3199                 hlist_add_head(&proc->deferred_work_node,
3200                                 &binder_deferred_list);
3201                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3202         }
3203         mutex_unlock(&binder_deferred_lock);
3204 }
3205
3206 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3207                                      struct binder_transaction *t)
3208 {
3209         seq_printf(m,
3210                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3211                    prefix, t->debug_id, t,
3212                    t->from ? t->from->proc->pid : 0,
3213                    t->from ? t->from->pid : 0,
3214                    t->to_proc ? t->to_proc->pid : 0,
3215                    t->to_thread ? t->to_thread->pid : 0,
3216                    t->code, t->flags, t->priority, t->need_reply);
3217         if (t->buffer == NULL) {
3218                 seq_puts(m, " buffer free\n");
3219                 return;
3220         }
3221         if (t->buffer->target_node)
3222                 seq_printf(m, " node %d",
3223                            t->buffer->target_node->debug_id);
3224         seq_printf(m, " size %zd:%zd data %p\n",
3225                    t->buffer->data_size, t->buffer->offsets_size,
3226                    t->buffer->data);
3227 }
3228
3229 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3230                                 struct binder_buffer *buffer)
3231 {
3232         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3233                    prefix, buffer->debug_id, buffer->data,
3234                    buffer->data_size, buffer->offsets_size,
3235                    buffer->transaction ? "active" : "delivered");
3236 }
3237
3238 static void print_binder_work(struct seq_file *m, const char *prefix,
3239                               const char *transaction_prefix,
3240                               struct binder_work *w)
3241 {
3242         struct binder_node *node;
3243         struct binder_transaction *t;
3244
3245         switch (w->type) {
3246         case BINDER_WORK_TRANSACTION:
3247                 t = container_of(w, struct binder_transaction, work);
3248                 print_binder_transaction(m, transaction_prefix, t);
3249                 break;
3250         case BINDER_WORK_TRANSACTION_COMPLETE:
3251                 seq_printf(m, "%stransaction complete\n", prefix);
3252                 break;
3253         case BINDER_WORK_NODE:
3254                 node = container_of(w, struct binder_node, work);
3255                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3256                            prefix, node->debug_id,
3257                            (u64)node->ptr, (u64)node->cookie);
3258                 break;
3259         case BINDER_WORK_DEAD_BINDER:
3260                 seq_printf(m, "%shas dead binder\n", prefix);
3261                 break;
3262         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3263                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3264                 break;
3265         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3266                 seq_printf(m, "%shas cleared death notification\n", prefix);
3267                 break;
3268         default:
3269                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3270                 break;
3271         }
3272 }
3273
3274 static void print_binder_thread(struct seq_file *m,
3275                                 struct binder_thread *thread,
3276                                 int print_always)
3277 {
3278         struct binder_transaction *t;
3279         struct binder_work *w;
3280         size_t start_pos = m->count;
3281         size_t header_pos;
3282
3283         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3284         header_pos = m->count;
3285         t = thread->transaction_stack;
3286         while (t) {
3287                 if (t->from == thread) {
3288                         print_binder_transaction(m,
3289                                                  "    outgoing transaction", t);
3290                         t = t->from_parent;
3291                 } else if (t->to_thread == thread) {
3292                         print_binder_transaction(m,
3293                                                  "    incoming transaction", t);
3294                         t = t->to_parent;
3295                 } else {
3296                         print_binder_transaction(m, "    bad transaction", t);
3297                         t = NULL;
3298                 }
3299         }
3300         list_for_each_entry(w, &thread->todo, entry) {
3301                 print_binder_work(m, "    ", "    pending transaction", w);
3302         }
3303         if (!print_always && m->count == header_pos)
3304                 m->count = start_pos;
3305 }
3306
3307 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3308 {
3309         struct binder_ref *ref;
3310         struct binder_work *w;
3311         int count;
3312
3313         count = 0;
3314         hlist_for_each_entry(ref, &node->refs, node_entry)
3315                 count++;
3316
3317         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3318                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3319                    node->has_strong_ref, node->has_weak_ref,
3320                    node->local_strong_refs, node->local_weak_refs,
3321                    node->internal_strong_refs, count);
3322         if (count) {
3323                 seq_puts(m, " proc");
3324                 hlist_for_each_entry(ref, &node->refs, node_entry)
3325                         seq_printf(m, " %d", ref->proc->pid);
3326         }
3327         seq_puts(m, "\n");
3328         list_for_each_entry(w, &node->async_todo, entry)
3329                 print_binder_work(m, "    ",
3330                                   "    pending async transaction", w);
3331 }
3332
3333 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3334 {
3335         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3336                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3337                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3338 }
3339
3340 static void print_binder_proc(struct seq_file *m,
3341                               struct binder_proc *proc, int print_all)
3342 {
3343         struct binder_work *w;
3344         struct rb_node *n;
3345         size_t start_pos = m->count;
3346         size_t header_pos;
3347
3348         seq_printf(m, "proc %d\n", proc->pid);
3349         header_pos = m->count;
3350
3351         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3352                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3353                                                 rb_node), print_all);
3354         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3355                 struct binder_node *node = rb_entry(n, struct binder_node,
3356                                                     rb_node);
3357                 if (print_all || node->has_async_transaction)
3358                         print_binder_node(m, node);
3359         }
3360         if (print_all) {
3361                 for (n = rb_first(&proc->refs_by_desc);
3362                      n != NULL;
3363                      n = rb_next(n))
3364                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3365                                                      rb_node_desc));
3366         }
3367         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3368                 print_binder_buffer(m, "  buffer",
3369                                     rb_entry(n, struct binder_buffer, rb_node));
3370         list_for_each_entry(w, &proc->todo, entry)
3371                 print_binder_work(m, "  ", "  pending transaction", w);
3372         list_for_each_entry(w, &proc->delivered_death, entry) {
3373                 seq_puts(m, "  has delivered dead binder\n");
3374                 break;
3375         }
3376         if (!print_all && m->count == header_pos)
3377                 m->count = start_pos;
3378 }
3379
3380 static const char * const binder_return_strings[] = {
3381         "BR_ERROR",
3382         "BR_OK",
3383         "BR_TRANSACTION",
3384         "BR_REPLY",
3385         "BR_ACQUIRE_RESULT",
3386         "BR_DEAD_REPLY",
3387         "BR_TRANSACTION_COMPLETE",
3388         "BR_INCREFS",
3389         "BR_ACQUIRE",
3390         "BR_RELEASE",
3391         "BR_DECREFS",
3392         "BR_ATTEMPT_ACQUIRE",
3393         "BR_NOOP",
3394         "BR_SPAWN_LOOPER",
3395         "BR_FINISHED",
3396         "BR_DEAD_BINDER",
3397         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3398         "BR_FAILED_REPLY"
3399 };
3400
3401 static const char * const binder_command_strings[] = {
3402         "BC_TRANSACTION",
3403         "BC_REPLY",
3404         "BC_ACQUIRE_RESULT",
3405         "BC_FREE_BUFFER",
3406         "BC_INCREFS",
3407         "BC_ACQUIRE",
3408         "BC_RELEASE",
3409         "BC_DECREFS",
3410         "BC_INCREFS_DONE",
3411         "BC_ACQUIRE_DONE",
3412         "BC_ATTEMPT_ACQUIRE",
3413         "BC_REGISTER_LOOPER",
3414         "BC_ENTER_LOOPER",
3415         "BC_EXIT_LOOPER",
3416         "BC_REQUEST_DEATH_NOTIFICATION",
3417         "BC_CLEAR_DEATH_NOTIFICATION",
3418         "BC_DEAD_BINDER_DONE"
3419 };
3420
3421 static const char * const binder_objstat_strings[] = {
3422         "proc",
3423         "thread",
3424         "node",
3425         "ref",
3426         "death",
3427         "transaction",
3428         "transaction_complete"
3429 };
3430
3431 static void print_binder_stats(struct seq_file *m, const char *prefix,
3432                                struct binder_stats *stats)
3433 {
3434         int i;
3435
3436         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3437                      ARRAY_SIZE(binder_command_strings));
3438         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3439                 if (stats->bc[i])
3440                         seq_printf(m, "%s%s: %d\n", prefix,
3441                                    binder_command_strings[i], stats->bc[i]);
3442         }
3443
3444         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3445                      ARRAY_SIZE(binder_return_strings));
3446         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3447                 if (stats->br[i])
3448                         seq_printf(m, "%s%s: %d\n", prefix,
3449                                    binder_return_strings[i], stats->br[i]);
3450         }
3451
3452         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3453                      ARRAY_SIZE(binder_objstat_strings));
3454         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3455                      ARRAY_SIZE(stats->obj_deleted));
3456         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3457                 if (stats->obj_created[i] || stats->obj_deleted[i])
3458                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3459                                 binder_objstat_strings[i],
3460                                 stats->obj_created[i] - stats->obj_deleted[i],
3461                                 stats->obj_created[i]);
3462         }
3463 }
3464
3465 static void print_binder_proc_stats(struct seq_file *m,
3466                                     struct binder_proc *proc)
3467 {
3468         struct binder_work *w;
3469         struct rb_node *n;
3470         int count, strong, weak;
3471
3472         seq_printf(m, "proc %d\n", proc->pid);
3473         count = 0;
3474         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3475                 count++;
3476         seq_printf(m, "  threads: %d\n", count);
3477         seq_printf(m, "  requested threads: %d+%d/%d\n"
3478                         "  ready threads %d\n"
3479                         "  free async space %zd\n", proc->requested_threads,
3480                         proc->requested_threads_started, proc->max_threads,
3481                         proc->ready_threads, proc->free_async_space);
3482         count = 0;
3483         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3484                 count++;
3485         seq_printf(m, "  nodes: %d\n", count);
3486         count = 0;
3487         strong = 0;
3488         weak = 0;
3489         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3490                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3491                                                   rb_node_desc);
3492                 count++;
3493                 strong += ref->strong;
3494                 weak += ref->weak;
3495         }
3496         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3497
3498         count = 0;
3499         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3500                 count++;
3501         seq_printf(m, "  buffers: %d\n", count);
3502
3503         count = 0;
3504         list_for_each_entry(w, &proc->todo, entry) {
3505                 switch (w->type) {
3506                 case BINDER_WORK_TRANSACTION:
3507                         count++;
3508                         break;
3509                 default:
3510                         break;
3511                 }
3512         }
3513         seq_printf(m, "  pending transactions: %d\n", count);
3514
3515         print_binder_stats(m, "  ", &proc->stats);
3516 }
3517
3518
3519 static int binder_state_show(struct seq_file *m, void *unused)
3520 {
3521         struct binder_proc *proc;
3522         struct binder_node *node;
3523         int do_lock = !binder_debug_no_lock;
3524
3525         if (do_lock)
3526                 binder_lock(__func__);
3527
3528         seq_puts(m, "binder state:\n");
3529
3530         if (!hlist_empty(&binder_dead_nodes))
3531                 seq_puts(m, "dead nodes:\n");
3532         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3533                 print_binder_node(m, node);
3534
3535         hlist_for_each_entry(proc, &binder_procs, proc_node)
3536                 print_binder_proc(m, proc, 1);
3537         if (do_lock)
3538                 binder_unlock(__func__);
3539         return 0;
3540 }
3541
3542 static int binder_stats_show(struct seq_file *m, void *unused)
3543 {
3544         struct binder_proc *proc;
3545         int do_lock = !binder_debug_no_lock;
3546
3547         if (do_lock)
3548                 binder_lock(__func__);
3549
3550         seq_puts(m, "binder stats:\n");
3551
3552         print_binder_stats(m, "", &binder_stats);
3553
3554         hlist_for_each_entry(proc, &binder_procs, proc_node)
3555                 print_binder_proc_stats(m, proc);
3556         if (do_lock)
3557                 binder_unlock(__func__);
3558         return 0;
3559 }
3560
3561 static int binder_transactions_show(struct seq_file *m, void *unused)
3562 {
3563         struct binder_proc *proc;
3564         int do_lock = !binder_debug_no_lock;
3565
3566         if (do_lock)
3567                 binder_lock(__func__);
3568
3569         seq_puts(m, "binder transactions:\n");
3570         hlist_for_each_entry(proc, &binder_procs, proc_node)
3571                 print_binder_proc(m, proc, 0);
3572         if (do_lock)
3573                 binder_unlock(__func__);
3574         return 0;
3575 }
3576
3577 static int binder_proc_show(struct seq_file *m, void *unused)
3578 {
3579         struct binder_proc *proc = m->private;
3580         int do_lock = !binder_debug_no_lock;
3581
3582         if (do_lock)
3583                 binder_lock(__func__);
3584         seq_puts(m, "binder proc state:\n");
3585         print_binder_proc(m, proc, 1);
3586         if (do_lock)
3587                 binder_unlock(__func__);
3588         return 0;
3589 }
3590
3591 static void print_binder_transaction_log_entry(struct seq_file *m,
3592                                         struct binder_transaction_log_entry *e)
3593 {
3594         seq_printf(m,
3595                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3596                    e->debug_id, (e->call_type == 2) ? "reply" :
3597                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3598                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3599                    e->target_handle, e->data_size, e->offsets_size);
3600 }
3601
3602 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3603 {
3604         struct binder_transaction_log *log = m->private;
3605         int i;
3606
3607         if (log->full) {
3608                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3609                         print_binder_transaction_log_entry(m, &log->entry[i]);
3610         }
3611         for (i = 0; i < log->next; i++)
3612                 print_binder_transaction_log_entry(m, &log->entry[i]);
3613         return 0;
3614 }
3615
3616 static const struct file_operations binder_fops = {
3617         .owner = THIS_MODULE,
3618         .poll = binder_poll,
3619         .unlocked_ioctl = binder_ioctl,
3620         .compat_ioctl = binder_ioctl,
3621         .mmap = binder_mmap,
3622         .open = binder_open,
3623         .flush = binder_flush,
3624         .release = binder_release,
3625 };
3626
3627 static struct miscdevice binder_miscdev = {
3628         .minor = MISC_DYNAMIC_MINOR,
3629         .name = "binder",
3630         .fops = &binder_fops
3631 };
3632
3633 BINDER_DEBUG_ENTRY(state);
3634 BINDER_DEBUG_ENTRY(stats);
3635 BINDER_DEBUG_ENTRY(transactions);
3636 BINDER_DEBUG_ENTRY(transaction_log);
3637
3638 static int __init binder_init(void)
3639 {
3640         int ret;
3641
3642         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3643         if (!binder_deferred_workqueue)
3644                 return -ENOMEM;
3645
3646         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3647         if (binder_debugfs_dir_entry_root)
3648                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3649                                                  binder_debugfs_dir_entry_root);
3650         ret = misc_register(&binder_miscdev);
3651         if (binder_debugfs_dir_entry_root) {
3652                 debugfs_create_file("state",
3653                                     S_IRUGO,
3654                                     binder_debugfs_dir_entry_root,
3655                                     NULL,
3656                                     &binder_state_fops);
3657                 debugfs_create_file("stats",
3658                                     S_IRUGO,
3659                                     binder_debugfs_dir_entry_root,
3660                                     NULL,
3661                                     &binder_stats_fops);
3662                 debugfs_create_file("transactions",
3663                                     S_IRUGO,
3664                                     binder_debugfs_dir_entry_root,
3665                                     NULL,
3666                                     &binder_transactions_fops);
3667                 debugfs_create_file("transaction_log",
3668                                     S_IRUGO,
3669                                     binder_debugfs_dir_entry_root,
3670                                     &binder_transaction_log,
3671                                     &binder_transaction_log_fops);
3672                 debugfs_create_file("failed_transaction_log",
3673                                     S_IRUGO,
3674                                     binder_debugfs_dir_entry_root,
3675                                     &binder_transaction_log_failed,
3676                                     &binder_transaction_log_fops);
3677         }
3678         return ret;
3679 }
3680
3681 device_initcall(binder_init);
3682
3683 #define CREATE_TRACE_POINTS
3684 #include "binder_trace.h"
3685
3686 MODULE_LICENSE("GPL v2");