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 #include <linux/security.h>
  41
  42 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  43 #define BINDER_IPC_32BIT 1
  44 #endif
  45
  46 #include <uapi/linux/android/binder.h>
  47 #include "binder_trace.h"
  48
  49 static DEFINE_MUTEX(binder_main_lock);
  50 static DEFINE_MUTEX(binder_deferred_lock);
  51 static DEFINE_MUTEX(binder_mmap_lock);
  52
  53 static HLIST_HEAD(binder_procs);
  54 static HLIST_HEAD(binder_deferred_list);
  55 static HLIST_HEAD(binder_dead_nodes);
  56
  57 static struct dentry *binder_debugfs_dir_entry_root;
  58 static struct dentry *binder_debugfs_dir_entry_proc;
  59 static struct binder_node *binder_context_mgr_node;
  60 static kuid_t binder_context_mgr_uid = INVALID_UID;
  61 static int binder_last_id;
  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 = rlimit_to_nice(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 <= MAX_NICE)
 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 page **page;
 554         struct mm_struct *mm;
 555
 556         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 557                      "%d: %s pages %p-%p\n", proc->pid,
 558                      allocate ? "allocate" : "free", start, end);
 559
 560         if (end <= start)
 561                 return 0;
 562
 563         trace_binder_update_page_range(proc, allocate, start, end);
 564
 565         if (vma)
 566                 mm = NULL;
 567         else
 568                 mm = get_task_mm(proc->tsk);
 569
 570         if (mm) {
 571                 down_write(&mm->mmap_sem);
 572                 vma = proc->vma;
 573                 if (vma && mm != proc->vma_vm_mm) {
 574                         pr_err("%d: vma mm and task mm mismatch\n",
 575                                 proc->pid);
 576                         vma = NULL;
 577                 }
 578         }
 579
 580         if (allocate == 0)
 581                 goto free_range;
 582
 583         if (vma == NULL) {
 584                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 585                         proc->pid);
 586                 goto err_no_vma;
 587         }
 588
 589         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 590                 int ret;
 591
 592                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 593
 594                 BUG_ON(*page);
 595                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 596                 if (*page == NULL) {
 597                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 598                                 proc->pid, page_addr);
 599                         goto err_alloc_page_failed;
 600                 }
 601                 ret = map_kernel_range_noflush((unsigned long)page_addr,
 602                                         PAGE_SIZE, PAGE_KERNEL, page);
 603                 flush_cache_vmap((unsigned long)page_addr,
 604                                 (unsigned long)page_addr + PAGE_SIZE);
 605                 if (ret != 1) {
 606                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 607                                proc->pid, page_addr);
 608                         goto err_map_kernel_failed;
 609                 }
 610                 user_page_addr =
 611                         (uintptr_t)page_addr + proc->user_buffer_offset;
 612                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 613                 if (ret) {
 614                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 615                                proc->pid, user_page_addr);
 616                         goto err_vm_insert_page_failed;
 617                 }
 618                 /* vm_insert_page does not seem to increment the refcount */
 619         }
 620         if (mm) {
 621                 up_write(&mm->mmap_sem);
 622                 mmput(mm);
 623         }
 624         return 0;
 625
 626 free_range:
 627         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 628              page_addr -= PAGE_SIZE) {
 629                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 630                 if (vma)
 631                         zap_page_range(vma, (uintptr_t)page_addr +
 632                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 633 err_vm_insert_page_failed:
 634                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 635 err_map_kernel_failed:
 636                 __free_page(*page);
 637                 *page = NULL;
 638 err_alloc_page_failed:
 639                 ;
 640         }
 641 err_no_vma:
 642         if (mm) {
 643                 up_write(&mm->mmap_sem);
 644                 mmput(mm);
 645         }
 646         return -ENOMEM;
 647 }
 648
 649 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 650                                               size_t data_size,
 651                                               size_t offsets_size, int is_async)
 652 {
 653         struct rb_node *n = proc->free_buffers.rb_node;
 654         struct binder_buffer *buffer;
 655         size_t buffer_size;
 656         struct rb_node *best_fit = NULL;
 657         void *has_page_addr;
 658         void *end_page_addr;
 659         size_t size;
 660
 661         if (proc->vma == NULL) {
 662                 pr_err("%d: binder_alloc_buf, no vma\n",
 663                        proc->pid);
 664                 return NULL;
 665         }
 666
 667         size = ALIGN(data_size, sizeof(void *)) +
 668                 ALIGN(offsets_size, sizeof(void *));
 669
 670         if (size < data_size || size < offsets_size) {
 671                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 672                                 proc->pid, data_size, offsets_size);
 673                 return NULL;
 674         }
 675
 676         if (is_async &&
 677             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 678                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 679                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 680                               proc->pid, size);
 681                 return NULL;
 682         }
 683
 684         while (n) {
 685                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 686                 BUG_ON(!buffer->free);
 687                 buffer_size = binder_buffer_size(proc, buffer);
 688
 689                 if (size < buffer_size) {
 690                         best_fit = n;
 691                         n = n->rb_left;
 692                 } else if (size > buffer_size)
 693                         n = n->rb_right;
 694                 else {
 695                         best_fit = n;
 696                         break;
 697                 }
 698         }
 699         if (best_fit == NULL) {
 700                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 701                         proc->pid, size);
 702                 return NULL;
 703         }
 704         if (n == NULL) {
 705                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 706                 buffer_size = binder_buffer_size(proc, buffer);
 707         }
 708
 709         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 710                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 711                       proc->pid, size, buffer, buffer_size);
 712
 713         has_page_addr =
 714                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 715         if (n == NULL) {
 716                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 717                         buffer_size = size; /* no room for other buffers */
 718                 else
 719                         buffer_size = size + sizeof(struct binder_buffer);
 720         }
 721         end_page_addr =
 722                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 723         if (end_page_addr > has_page_addr)
 724                 end_page_addr = has_page_addr;
 725         if (binder_update_page_range(proc, 1,
 726             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 727                 return NULL;
 728
 729         rb_erase(best_fit, &proc->free_buffers);
 730         buffer->free = 0;
 731         binder_insert_allocated_buffer(proc, buffer);
 732         if (buffer_size != size) {
 733                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 734
 735                 list_add(&new_buffer->entry, &buffer->entry);
 736                 new_buffer->free = 1;
 737                 binder_insert_free_buffer(proc, new_buffer);
 738         }
 739         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 740                      "%d: binder_alloc_buf size %zd got %p\n",
 741                       proc->pid, size, buffer);
 742         buffer->data_size = data_size;
 743         buffer->offsets_size = offsets_size;
 744         buffer->async_transaction = is_async;
 745         if (is_async) {
 746                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 747                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 748                              "%d: binder_alloc_buf size %zd async free %zd\n",
 749                               proc->pid, size, proc->free_async_space);
 750         }
 751
 752         return buffer;
 753 }
 754
 755 static void *buffer_start_page(struct binder_buffer *buffer)
 756 {
 757         return (void *)((uintptr_t)buffer & PAGE_MASK);
 758 }
 759
 760 static void *buffer_end_page(struct binder_buffer *buffer)
 761 {
 762         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 763 }
 764
 765 static void binder_delete_free_buffer(struct binder_proc *proc,
 766                                       struct binder_buffer *buffer)
 767 {
 768         struct binder_buffer *prev, *next = NULL;
 769         int free_page_end = 1;
 770         int free_page_start = 1;
 771
 772         BUG_ON(proc->buffers.next == &buffer->entry);
 773         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 774         BUG_ON(!prev->free);
 775         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 776                 free_page_start = 0;
 777                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 778                         free_page_end = 0;
 779                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 780                              "%d: merge free, buffer %p share page with %p\n",
 781                               proc->pid, buffer, prev);
 782         }
 783
 784         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 785                 next = list_entry(buffer->entry.next,
 786                                   struct binder_buffer, entry);
 787                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 788                         free_page_end = 0;
 789                         if (buffer_start_page(next) ==
 790                             buffer_start_page(buffer))
 791                                 free_page_start = 0;
 792                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 793                                      "%d: merge free, buffer %p share page with %p\n",
 794                                       proc->pid, buffer, prev);
 795                 }
 796         }
 797         list_del(&buffer->entry);
 798         if (free_page_start || free_page_end) {
 799                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 800                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 801                              proc->pid, buffer, free_page_start ? "" : " end",
 802                              free_page_end ? "" : " start", prev, next);
 803                 binder_update_page_range(proc, 0, free_page_start ?
 804                         buffer_start_page(buffer) : buffer_end_page(buffer),
 805                         (free_page_end ? buffer_end_page(buffer) :
 806                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 807         }
 808 }
 809
 810 static void binder_free_buf(struct binder_proc *proc,
 811                             struct binder_buffer *buffer)
 812 {
 813         size_t size, buffer_size;
 814
 815         buffer_size = binder_buffer_size(proc, buffer);
 816
 817         size = ALIGN(buffer->data_size, sizeof(void *)) +
 818                 ALIGN(buffer->offsets_size, sizeof(void *));
 819
 820         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 821                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 822                       proc->pid, buffer, size, buffer_size);
 823
 824         BUG_ON(buffer->free);
 825         BUG_ON(size > buffer_size);
 826         BUG_ON(buffer->transaction != NULL);
 827         BUG_ON((void *)buffer < proc->buffer);
 828         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 829
 830         if (buffer->async_transaction) {
 831                 proc->free_async_space += size + sizeof(struct binder_buffer);
 832
 833                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 834                              "%d: binder_free_buf size %zd async free %zd\n",
 835                               proc->pid, size, proc->free_async_space);
 836         }
 837
 838         binder_update_page_range(proc, 0,
 839                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 840                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 841                 NULL);
 842         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 843         buffer->free = 1;
 844         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 845                 struct binder_buffer *next = list_entry(buffer->entry.next,
 846                                                 struct binder_buffer, entry);
 847
 848                 if (next->free) {
 849                         rb_erase(&next->rb_node, &proc->free_buffers);
 850                         binder_delete_free_buffer(proc, next);
 851                 }
 852         }
 853         if (proc->buffers.next != &buffer->entry) {
 854                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 855                                                 struct binder_buffer, entry);
 856
 857                 if (prev->free) {
 858                         binder_delete_free_buffer(proc, buffer);
 859                         rb_erase(&prev->rb_node, &proc->free_buffers);
 860                         buffer = prev;
 861                 }
 862         }
 863         binder_insert_free_buffer(proc, buffer);
 864 }
 865
 866 static struct binder_node *binder_get_node(struct binder_proc *proc,
 867                                            binder_uintptr_t ptr)
 868 {
 869         struct rb_node *n = proc->nodes.rb_node;
 870         struct binder_node *node;
 871
 872         while (n) {
 873                 node = rb_entry(n, struct binder_node, rb_node);
 874
 875                 if (ptr < node->ptr)
 876                         n = n->rb_left;
 877                 else if (ptr > node->ptr)
 878                         n = n->rb_right;
 879                 else
 880                         return node;
 881         }
 882         return NULL;
 883 }
 884
 885 static struct binder_node *binder_new_node(struct binder_proc *proc,
 886                                            binder_uintptr_t ptr,
 887                                            binder_uintptr_t cookie)
 888 {
 889         struct rb_node **p = &proc->nodes.rb_node;
 890         struct rb_node *parent = NULL;
 891         struct binder_node *node;
 892
 893         while (*p) {
 894                 parent = *p;
 895                 node = rb_entry(parent, struct binder_node, rb_node);
 896
 897                 if (ptr < node->ptr)
 898                         p = &(*p)->rb_left;
 899                 else if (ptr > node->ptr)
 900                         p = &(*p)->rb_right;
 901                 else
 902                         return NULL;
 903         }
 904
 905         node = kzalloc(sizeof(*node), GFP_KERNEL);
 906         if (node == NULL)
 907                 return NULL;
 908         binder_stats_created(BINDER_STAT_NODE);
 909         rb_link_node(&node->rb_node, parent, p);
 910         rb_insert_color(&node->rb_node, &proc->nodes);
 911         node->debug_id = ++binder_last_id;
 912         node->proc = proc;
 913         node->ptr = ptr;
 914         node->cookie = cookie;
 915         node->work.type = BINDER_WORK_NODE;
 916         INIT_LIST_HEAD(&node->work.entry);
 917         INIT_LIST_HEAD(&node->async_todo);
 918         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 919                      "%d:%d node %d u%016llx c%016llx created\n",
 920                      proc->pid, current->pid, node->debug_id,
 921                      (u64)node->ptr, (u64)node->cookie);
 922         return node;
 923 }
 924
 925 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 926                            struct list_head *target_list)
 927 {
 928         if (strong) {
 929                 if (internal) {
 930                         if (target_list == NULL &&
 931                             node->internal_strong_refs == 0 &&
 932                             !(node == binder_context_mgr_node &&
 933                             node->has_strong_ref)) {
 934                                 pr_err("invalid inc strong node for %d\n",
 935                                         node->debug_id);
 936                                 return -EINVAL;
 937                         }
 938                         node->internal_strong_refs++;
 939                 } else
 940                         node->local_strong_refs++;
 941                 if (!node->has_strong_ref && target_list) {
 942                         list_del_init(&node->work.entry);
 943                         list_add_tail(&node->work.entry, target_list);
 944                 }
 945         } else {
 946                 if (!internal)
 947                         node->local_weak_refs++;
 948                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 949                         if (target_list == NULL) {
 950                                 pr_err("invalid inc weak node for %d\n",
 951                                         node->debug_id);
 952                                 return -EINVAL;
 953                         }
 954                         list_add_tail(&node->work.entry, target_list);
 955                 }
 956         }
 957         return 0;
 958 }
 959
 960 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 961 {
 962         if (strong) {
 963                 if (internal)
 964                         node->internal_strong_refs--;
 965                 else
 966                         node->local_strong_refs--;
 967                 if (node->local_strong_refs || node->internal_strong_refs)
 968                         return 0;
 969         } else {
 970                 if (!internal)
 971                         node->local_weak_refs--;
 972                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 973                         return 0;
 974         }
 975         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 976                 if (list_empty(&node->work.entry)) {
 977                         list_add_tail(&node->work.entry, &node->proc->todo);
 978                         wake_up_interruptible(&node->proc->wait);
 979                 }
 980         } else {
 981                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 982                     !node->local_weak_refs) {
 983                         list_del_init(&node->work.entry);
 984                         if (node->proc) {
 985                                 rb_erase(&node->rb_node, &node->proc->nodes);
 986                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 987                                              "refless node %d deleted\n",
 988                                              node->debug_id);
 989                         } else {
 990                                 hlist_del(&node->dead_node);
 991                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 992                                              "dead node %d deleted\n",
 993                                              node->debug_id);
 994                         }
 995                         kfree(node);
 996                         binder_stats_deleted(BINDER_STAT_NODE);
 997                 }
 998         }
 999
1000         return 0;
1001 }
1002
1003
1004 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1005                                          u32 desc, bool need_strong_ref)
1006 {
1007         struct rb_node *n = proc->refs_by_desc.rb_node;
1008         struct binder_ref *ref;
1009
1010         while (n) {
1011                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1012
1013                 if (desc < ref->desc) {
1014                         n = n->rb_left;
1015                 } else if (desc > ref->desc) {
1016                         n = n->rb_right;
1017                 } else if (need_strong_ref && !ref->strong) {
1018                         binder_user_error("tried to use weak ref as strong ref\n");
1019                         return NULL;
1020                 } else {
1021                         return ref;
1022                 }
1023         }
1024         return NULL;
1025 }
1026
1027 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1028                                                   struct binder_node *node)
1029 {
1030         struct rb_node *n;
1031         struct rb_node **p = &proc->refs_by_node.rb_node;
1032         struct rb_node *parent = NULL;
1033         struct binder_ref *ref, *new_ref;
1034
1035         while (*p) {
1036                 parent = *p;
1037                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1038
1039                 if (node < ref->node)
1040                         p = &(*p)->rb_left;
1041                 else if (node > ref->node)
1042                         p = &(*p)->rb_right;
1043                 else
1044                         return ref;
1045         }
1046         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1047         if (new_ref == NULL)
1048                 return NULL;
1049         binder_stats_created(BINDER_STAT_REF);
1050         new_ref->debug_id = ++binder_last_id;
1051         new_ref->proc = proc;
1052         new_ref->node = node;
1053         rb_link_node(&new_ref->rb_node_node, parent, p);
1054         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1055
1056         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1057         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1058                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1059                 if (ref->desc > new_ref->desc)
1060                         break;
1061                 new_ref->desc = ref->desc + 1;
1062         }
1063
1064         p = &proc->refs_by_desc.rb_node;
1065         while (*p) {
1066                 parent = *p;
1067                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1068
1069                 if (new_ref->desc < ref->desc)
1070                         p = &(*p)->rb_left;
1071                 else if (new_ref->desc > ref->desc)
1072                         p = &(*p)->rb_right;
1073                 else
1074                         BUG();
1075         }
1076         rb_link_node(&new_ref->rb_node_desc, parent, p);
1077         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1078         if (node) {
1079                 hlist_add_head(&new_ref->node_entry, &node->refs);
1080
1081                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1082                              "%d new ref %d desc %d for node %d\n",
1083                               proc->pid, new_ref->debug_id, new_ref->desc,
1084                               node->debug_id);
1085         } else {
1086                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1087                              "%d new ref %d desc %d for dead node\n",
1088                               proc->pid, new_ref->debug_id, new_ref->desc);
1089         }
1090         return new_ref;
1091 }
1092
1093 static void binder_delete_ref(struct binder_ref *ref)
1094 {
1095         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1096                      "%d delete ref %d desc %d for node %d\n",
1097                       ref->proc->pid, ref->debug_id, ref->desc,
1098                       ref->node->debug_id);
1099
1100         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1101         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1102         if (ref->strong)
1103                 binder_dec_node(ref->node, 1, 1);
1104         hlist_del(&ref->node_entry);
1105         binder_dec_node(ref->node, 0, 1);
1106         if (ref->death) {
1107                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1108                              "%d delete ref %d desc %d has death notification\n",
1109                               ref->proc->pid, ref->debug_id, ref->desc);
1110                 list_del(&ref->death->work.entry);
1111                 kfree(ref->death);
1112                 binder_stats_deleted(BINDER_STAT_DEATH);
1113         }
1114         kfree(ref);
1115         binder_stats_deleted(BINDER_STAT_REF);
1116 }
1117
1118 static int binder_inc_ref(struct binder_ref *ref, int strong,
1119                           struct list_head *target_list)
1120 {
1121         int ret;
1122
1123         if (strong) {
1124                 if (ref->strong == 0) {
1125                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1126                         if (ret)
1127                                 return ret;
1128                 }
1129                 ref->strong++;
1130         } else {
1131                 if (ref->weak == 0) {
1132                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1133                         if (ret)
1134                                 return ret;
1135                 }
1136                 ref->weak++;
1137         }
1138         return 0;
1139 }
1140
1141
1142 static int binder_dec_ref(struct binder_ref *ref, int strong)
1143 {
1144         if (strong) {
1145                 if (ref->strong == 0) {
1146                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1147                                           ref->proc->pid, ref->debug_id,
1148                                           ref->desc, ref->strong, ref->weak);
1149                         return -EINVAL;
1150                 }
1151                 ref->strong--;
1152                 if (ref->strong == 0) {
1153                         int ret;
1154
1155                         ret = binder_dec_node(ref->node, strong, 1);
1156                         if (ret)
1157                                 return ret;
1158                 }
1159         } else {
1160                 if (ref->weak == 0) {
1161                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1162                                           ref->proc->pid, ref->debug_id,
1163                                           ref->desc, ref->strong, ref->weak);
1164                         return -EINVAL;
1165                 }
1166                 ref->weak--;
1167         }
1168         if (ref->strong == 0 && ref->weak == 0)
1169                 binder_delete_ref(ref);
1170         return 0;
1171 }
1172
1173 static void binder_pop_transaction(struct binder_thread *target_thread,
1174                                    struct binder_transaction *t)
1175 {
1176         if (target_thread) {
1177                 BUG_ON(target_thread->transaction_stack != t);
1178                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1179                 target_thread->transaction_stack =
1180                         target_thread->transaction_stack->from_parent;
1181                 t->from = NULL;
1182         }
1183         t->need_reply = 0;
1184         if (t->buffer)
1185                 t->buffer->transaction = NULL;
1186         kfree(t);
1187         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1188 }
1189
1190 static void binder_send_failed_reply(struct binder_transaction *t,
1191                                      uint32_t error_code)
1192 {
1193         struct binder_thread *target_thread;
1194         struct binder_transaction *next;
1195
1196         BUG_ON(t->flags & TF_ONE_WAY);
1197         while (1) {
1198                 target_thread = t->from;
1199                 if (target_thread) {
1200                         if (target_thread->return_error != BR_OK &&
1201                            target_thread->return_error2 == BR_OK) {
1202                                 target_thread->return_error2 =
1203                                         target_thread->return_error;
1204                                 target_thread->return_error = BR_OK;
1205                         }
1206                         if (target_thread->return_error == BR_OK) {
1207                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1208                                              "send failed reply for transaction %d to %d:%d\n",
1209                                               t->debug_id,
1210                                               target_thread->proc->pid,
1211                                               target_thread->pid);
1212
1213                                 binder_pop_transaction(target_thread, t);
1214                                 target_thread->return_error = error_code;
1215                                 wake_up_interruptible(&target_thread->wait);
1216                         } else {
1217                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1218                                         target_thread->proc->pid,
1219                                         target_thread->pid,
1220                                         target_thread->return_error);
1221                         }
1222                         return;
1223                 }
1224                 next = t->from_parent;
1225
1226                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1227                              "send failed reply for transaction %d, target dead\n",
1228                              t->debug_id);
1229
1230                 binder_pop_transaction(target_thread, t);
1231                 if (next == NULL) {
1232                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1233                                      "reply failed, no target thread at root\n");
1234                         return;
1235                 }
1236                 t = next;
1237                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1238                              "reply failed, no target thread -- retry %d\n",
1239                               t->debug_id);
1240         }
1241 }
1242
1243 static void binder_transaction_buffer_release(struct binder_proc *proc,
1244                                               struct binder_buffer *buffer,
1245                                               binder_size_t *failed_at)
1246 {
1247         binder_size_t *offp, *off_end;
1248         int debug_id = buffer->debug_id;
1249
1250         binder_debug(BINDER_DEBUG_TRANSACTION,
1251                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1252                      proc->pid, buffer->debug_id,
1253                      buffer->data_size, buffer->offsets_size, failed_at);
1254
1255         if (buffer->target_node)
1256                 binder_dec_node(buffer->target_node, 1, 0);
1257
1258         offp = (binder_size_t *)(buffer->data +
1259                                  ALIGN(buffer->data_size, sizeof(void *)));
1260         if (failed_at)
1261                 off_end = failed_at;
1262         else
1263                 off_end = (void *)offp + buffer->offsets_size;
1264         for (; offp < off_end; offp++) {
1265                 struct flat_binder_object *fp;
1266
1267                 if (*offp > buffer->data_size - sizeof(*fp) ||
1268                     buffer->data_size < sizeof(*fp) ||
1269                     !IS_ALIGNED(*offp, sizeof(u32))) {
1270                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1271                                debug_id, (u64)*offp, buffer->data_size);
1272                         continue;
1273                 }
1274                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1275                 switch (fp->type) {
1276                 case BINDER_TYPE_BINDER:
1277                 case BINDER_TYPE_WEAK_BINDER: {
1278                         struct binder_node *node = binder_get_node(proc, fp->binder);
1279
1280                         if (node == NULL) {
1281                                 pr_err("transaction release %d bad node %016llx\n",
1282                                        debug_id, (u64)fp->binder);
1283                                 break;
1284                         }
1285                         binder_debug(BINDER_DEBUG_TRANSACTION,
1286                                      "        node %d u%016llx\n",
1287                                      node->debug_id, (u64)node->ptr);
1288                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1289                 } break;
1290                 case BINDER_TYPE_HANDLE:
1291                 case BINDER_TYPE_WEAK_HANDLE: {
1292                         struct binder_ref *ref;
1293
1294                         ref = binder_get_ref(proc, fp->handle,
1295                                              fp->type == BINDER_TYPE_HANDLE);
1296
1297                         if (ref == NULL) {
1298                                 pr_err("transaction release %d bad handle %d\n",
1299                                  debug_id, fp->handle);
1300                                 break;
1301                         }
1302                         binder_debug(BINDER_DEBUG_TRANSACTION,
1303                                      "        ref %d desc %d (node %d)\n",
1304                                      ref->debug_id, ref->desc, ref->node->debug_id);
1305                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1306                 } break;
1307
1308                 case BINDER_TYPE_FD:
1309                         binder_debug(BINDER_DEBUG_TRANSACTION,
1310                                      "        fd %d\n", fp->handle);
1311                         if (failed_at)
1312                                 task_close_fd(proc, fp->handle);
1313                         break;
1314
1315                 default:
1316                         pr_err("transaction release %d bad object type %x\n",
1317                                 debug_id, fp->type);
1318                         break;
1319                 }
1320         }
1321 }
1322
1323 static void binder_transaction(struct binder_proc *proc,
1324                                struct binder_thread *thread,
1325                                struct binder_transaction_data *tr, int reply)
1326 {
1327         struct binder_transaction *t;
1328         struct binder_work *tcomplete;
1329         binder_size_t *offp, *off_end;
1330         binder_size_t off_min;
1331         struct binder_proc *target_proc;
1332         struct binder_thread *target_thread = NULL;
1333         struct binder_node *target_node = NULL;
1334         struct list_head *target_list;
1335         wait_queue_head_t *target_wait;
1336         struct binder_transaction *in_reply_to = NULL;
1337         struct binder_transaction_log_entry *e;
1338         uint32_t return_error;
1339
1340         e = binder_transaction_log_add(&binder_transaction_log);
1341         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1342         e->from_proc = proc->pid;
1343         e->from_thread = thread->pid;
1344         e->target_handle = tr->target.handle;
1345         e->data_size = tr->data_size;
1346         e->offsets_size = tr->offsets_size;
1347
1348         if (reply) {
1349                 in_reply_to = thread->transaction_stack;
1350                 if (in_reply_to == NULL) {
1351                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1352                                           proc->pid, thread->pid);
1353                         return_error = BR_FAILED_REPLY;
1354                         goto err_empty_call_stack;
1355                 }
1356                 binder_set_nice(in_reply_to->saved_priority);
1357                 if (in_reply_to->to_thread != thread) {
1358                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1359                                 proc->pid, thread->pid, in_reply_to->debug_id,
1360                                 in_reply_to->to_proc ?
1361                                 in_reply_to->to_proc->pid : 0,
1362                                 in_reply_to->to_thread ?
1363                                 in_reply_to->to_thread->pid : 0);
1364                         return_error = BR_FAILED_REPLY;
1365                         in_reply_to = NULL;
1366                         goto err_bad_call_stack;
1367                 }
1368                 thread->transaction_stack = in_reply_to->to_parent;
1369                 target_thread = in_reply_to->from;
1370                 if (target_thread == NULL) {
1371                         return_error = BR_DEAD_REPLY;
1372                         goto err_dead_binder;
1373                 }
1374                 if (target_thread->transaction_stack != in_reply_to) {
1375                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1376                                 proc->pid, thread->pid,
1377                                 target_thread->transaction_stack ?
1378                                 target_thread->transaction_stack->debug_id : 0,
1379                                 in_reply_to->debug_id);
1380                         return_error = BR_FAILED_REPLY;
1381                         in_reply_to = NULL;
1382                         target_thread = NULL;
1383                         goto err_dead_binder;
1384                 }
1385                 target_proc = target_thread->proc;
1386         } else {
1387                 if (tr->target.handle) {
1388                         struct binder_ref *ref;
1389
1390                         ref = binder_get_ref(proc, tr->target.handle, true);
1391                         if (ref == NULL) {
1392                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1393                                         proc->pid, thread->pid);
1394                                 return_error = BR_FAILED_REPLY;
1395                                 goto err_invalid_target_handle;
1396                         }
1397                         target_node = ref->node;
1398                 } else {
1399                         target_node = binder_context_mgr_node;
1400                         if (target_node == NULL) {
1401                                 return_error = BR_DEAD_REPLY;
1402                                 goto err_no_context_mgr_node;
1403                         }
1404                 }
1405                 e->to_node = target_node->debug_id;
1406                 target_proc = target_node->proc;
1407                 if (target_proc == NULL) {
1408                         return_error = BR_DEAD_REPLY;
1409                         goto err_dead_binder;
1410                 }
1411                 if (security_binder_transaction(proc->tsk,
1412                                                 target_proc->tsk) < 0) {
1413                         return_error = BR_FAILED_REPLY;
1414                         goto err_invalid_target_handle;
1415                 }
1416                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1417                         struct binder_transaction *tmp;
1418
1419                         tmp = thread->transaction_stack;
1420                         if (tmp->to_thread != thread) {
1421                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1422                                         proc->pid, thread->pid, tmp->debug_id,
1423                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1424                                         tmp->to_thread ?
1425                                         tmp->to_thread->pid : 0);
1426                                 return_error = BR_FAILED_REPLY;
1427                                 goto err_bad_call_stack;
1428                         }
1429                         while (tmp) {
1430                                 if (tmp->from && tmp->from->proc == target_proc)
1431                                         target_thread = tmp->from;
1432                                 tmp = tmp->from_parent;
1433                         }
1434                 }
1435         }
1436         if (target_thread) {
1437                 e->to_thread = target_thread->pid;
1438                 target_list = &target_thread->todo;
1439                 target_wait = &target_thread->wait;
1440         } else {
1441                 target_list = &target_proc->todo;
1442                 target_wait = &target_proc->wait;
1443         }
1444         e->to_proc = target_proc->pid;
1445
1446         /* TODO: reuse incoming transaction for reply */
1447         t = kzalloc(sizeof(*t), GFP_KERNEL);
1448         if (t == NULL) {
1449                 return_error = BR_FAILED_REPLY;
1450                 goto err_alloc_t_failed;
1451         }
1452         binder_stats_created(BINDER_STAT_TRANSACTION);
1453
1454         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1455         if (tcomplete == NULL) {
1456                 return_error = BR_FAILED_REPLY;
1457                 goto err_alloc_tcomplete_failed;
1458         }
1459         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1460
1461         t->debug_id = ++binder_last_id;
1462         e->debug_id = t->debug_id;
1463
1464         if (reply)
1465                 binder_debug(BINDER_DEBUG_TRANSACTION,
1466                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1467                              proc->pid, thread->pid, t->debug_id,
1468                              target_proc->pid, target_thread->pid,
1469                              (u64)tr->data.ptr.buffer,
1470                              (u64)tr->data.ptr.offsets,
1471                              (u64)tr->data_size, (u64)tr->offsets_size);
1472         else
1473                 binder_debug(BINDER_DEBUG_TRANSACTION,
1474                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1475                              proc->pid, thread->pid, t->debug_id,
1476                              target_proc->pid, target_node->debug_id,
1477                              (u64)tr->data.ptr.buffer,
1478                              (u64)tr->data.ptr.offsets,
1479                              (u64)tr->data_size, (u64)tr->offsets_size);
1480
1481         if (!reply && !(tr->flags & TF_ONE_WAY))
1482                 t->from = thread;
1483         else
1484                 t->from = NULL;
1485         t->sender_euid = task_euid(proc->tsk);
1486         t->to_proc = target_proc;
1487         t->to_thread = target_thread;
1488         t->code = tr->code;
1489         t->flags = tr->flags;
1490         t->priority = task_nice(current);
1491
1492         trace_binder_transaction(reply, t, target_node);
1493
1494         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1495                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1496         if (t->buffer == NULL) {
1497                 return_error = BR_FAILED_REPLY;
1498                 goto err_binder_alloc_buf_failed;
1499         }
1500         t->buffer->allow_user_free = 0;
1501         t->buffer->debug_id = t->debug_id;
1502         t->buffer->transaction = t;
1503         t->buffer->target_node = target_node;
1504         trace_binder_transaction_alloc_buf(t->buffer);
1505         if (target_node)
1506                 binder_inc_node(target_node, 1, 0, NULL);
1507
1508         offp = (binder_size_t *)(t->buffer->data +
1509                                  ALIGN(tr->data_size, sizeof(void *)));
1510
1511         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1512                            tr->data.ptr.buffer, tr->data_size)) {
1513                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1514                                 proc->pid, thread->pid);
1515                 return_error = BR_FAILED_REPLY;
1516                 goto err_copy_data_failed;
1517         }
1518         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1519                            tr->data.ptr.offsets, tr->offsets_size)) {
1520                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1521                                 proc->pid, thread->pid);
1522                 return_error = BR_FAILED_REPLY;
1523                 goto err_copy_data_failed;
1524         }
1525         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1526                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1527                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1528                 return_error = BR_FAILED_REPLY;
1529                 goto err_bad_offset;
1530         }
1531         off_end = (void *)offp + tr->offsets_size;
1532         off_min = 0;
1533         for (; offp < off_end; offp++) {
1534                 struct flat_binder_object *fp;
1535
1536                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1537                     *offp < off_min ||
1538                     t->buffer->data_size < sizeof(*fp) ||
1539                     !IS_ALIGNED(*offp, sizeof(u32))) {
1540                         binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
1541                                           proc->pid, thread->pid, (u64)*offp,
1542                                           (u64)off_min,
1543                                           (u64)(t->buffer->data_size -
1544                                           sizeof(*fp)));
1545                         return_error = BR_FAILED_REPLY;
1546                         goto err_bad_offset;
1547                 }
1548                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1549                 off_min = *offp + sizeof(struct flat_binder_object);
1550                 switch (fp->type) {
1551                 case BINDER_TYPE_BINDER:
1552                 case BINDER_TYPE_WEAK_BINDER: {
1553                         struct binder_ref *ref;
1554                         struct binder_node *node = binder_get_node(proc, fp->binder);
1555
1556                         if (node == NULL) {
1557                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1558                                 if (node == NULL) {
1559                                         return_error = BR_FAILED_REPLY;
1560                                         goto err_binder_new_node_failed;
1561                                 }
1562                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1563                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1564                         }
1565                         if (fp->cookie != node->cookie) {
1566                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1567                                         proc->pid, thread->pid,
1568                                         (u64)fp->binder, node->debug_id,
1569                                         (u64)fp->cookie, (u64)node->cookie);
1570                                 return_error = BR_FAILED_REPLY;
1571                                 goto err_binder_get_ref_for_node_failed;
1572                         }
1573                         if (security_binder_transfer_binder(proc->tsk,
1574                                                             target_proc->tsk)) {
1575                                 return_error = BR_FAILED_REPLY;
1576                                 goto err_binder_get_ref_for_node_failed;
1577                         }
1578                         ref = binder_get_ref_for_node(target_proc, node);
1579                         if (ref == NULL) {
1580                                 return_error = BR_FAILED_REPLY;
1581                                 goto err_binder_get_ref_for_node_failed;
1582                         }
1583                         if (fp->type == BINDER_TYPE_BINDER)
1584                                 fp->type = BINDER_TYPE_HANDLE;
1585                         else
1586                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1587                         fp->binder = 0;
1588                         fp->handle = ref->desc;
1589                         fp->cookie = 0;
1590                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1591                                        &thread->todo);
1592
1593                         trace_binder_transaction_node_to_ref(t, node, ref);
1594                         binder_debug(BINDER_DEBUG_TRANSACTION,
1595                                      "        node %d u%016llx -> ref %d desc %d\n",
1596                                      node->debug_id, (u64)node->ptr,
1597                                      ref->debug_id, ref->desc);
1598                 } break;
1599                 case BINDER_TYPE_HANDLE:
1600                 case BINDER_TYPE_WEAK_HANDLE: {
1601                         struct binder_ref *ref;
1602
1603                         ref = binder_get_ref(proc, fp->handle,
1604                                              fp->type == BINDER_TYPE_HANDLE);
1605
1606                         if (ref == NULL) {
1607                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1608                                                 proc->pid,
1609                                                 thread->pid, fp->handle);
1610                                 return_error = BR_FAILED_REPLY;
1611                                 goto err_binder_get_ref_failed;
1612                         }
1613                         if (security_binder_transfer_binder(proc->tsk,
1614                                                             target_proc->tsk)) {
1615                                 return_error = BR_FAILED_REPLY;
1616                                 goto err_binder_get_ref_failed;
1617                         }
1618                         if (ref->node->proc == target_proc) {
1619                                 if (fp->type == BINDER_TYPE_HANDLE)
1620                                         fp->type = BINDER_TYPE_BINDER;
1621                                 else
1622                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1623                                 fp->binder = ref->node->ptr;
1624                                 fp->cookie = ref->node->cookie;
1625                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1626                                 trace_binder_transaction_ref_to_node(t, ref);
1627                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1628                                              "        ref %d desc %d -> node %d u%016llx\n",
1629                                              ref->debug_id, ref->desc, ref->node->debug_id,
1630                                              (u64)ref->node->ptr);
1631                         } else {
1632                                 struct binder_ref *new_ref;
1633
1634                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1635                                 if (new_ref == NULL) {
1636                                         return_error = BR_FAILED_REPLY;
1637                                         goto err_binder_get_ref_for_node_failed;
1638                                 }
1639                                 fp->binder = 0;
1640                                 fp->handle = new_ref->desc;
1641                                 fp->cookie = 0;
1642                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1643                                 trace_binder_transaction_ref_to_ref(t, ref,
1644                                                                     new_ref);
1645                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1646                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1647                                              ref->debug_id, ref->desc, new_ref->debug_id,
1648                                              new_ref->desc, ref->node->debug_id);
1649                         }
1650                 } break;
1651
1652                 case BINDER_TYPE_FD: {
1653                         int target_fd;
1654                         struct file *file;
1655
1656                         if (reply) {
1657                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1658                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1659                                                 proc->pid, thread->pid, fp->handle);
1660                                         return_error = BR_FAILED_REPLY;
1661                                         goto err_fd_not_allowed;
1662                                 }
1663                         } else if (!target_node->accept_fds) {
1664                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1665                                         proc->pid, thread->pid, fp->handle);
1666                                 return_error = BR_FAILED_REPLY;
1667                                 goto err_fd_not_allowed;
1668                         }
1669
1670                         file = fget(fp->handle);
1671                         if (file == NULL) {
1672                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1673                                         proc->pid, thread->pid, fp->handle);
1674                                 return_error = BR_FAILED_REPLY;
1675                                 goto err_fget_failed;
1676                         }
1677                         if (security_binder_transfer_file(proc->tsk,
1678                                                           target_proc->tsk,
1679                                                           file) < 0) {
1680                                 fput(file);
1681                                 return_error = BR_FAILED_REPLY;
1682                                 goto err_get_unused_fd_failed;
1683                         }
1684                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1685                         if (target_fd < 0) {
1686                                 fput(file);
1687                                 return_error = BR_FAILED_REPLY;
1688                                 goto err_get_unused_fd_failed;
1689                         }
1690                         task_fd_install(target_proc, target_fd, file);
1691                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1692                         binder_debug(BINDER_DEBUG_TRANSACTION,
1693                                      "        fd %d -> %d\n", fp->handle, target_fd);
1694                         /* TODO: fput? */
1695                         fp->binder = 0;
1696                         fp->handle = target_fd;
1697                 } break;
1698
1699                 default:
1700                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1701                                 proc->pid, thread->pid, fp->type);
1702                         return_error = BR_FAILED_REPLY;
1703                         goto err_bad_object_type;
1704                 }
1705         }
1706         if (reply) {
1707                 BUG_ON(t->buffer->async_transaction != 0);
1708                 binder_pop_transaction(target_thread, in_reply_to);
1709         } else if (!(t->flags & TF_ONE_WAY)) {
1710                 BUG_ON(t->buffer->async_transaction != 0);
1711                 t->need_reply = 1;
1712                 t->from_parent = thread->transaction_stack;
1713                 thread->transaction_stack = t;
1714         } else {
1715                 BUG_ON(target_node == NULL);
1716                 BUG_ON(t->buffer->async_transaction != 1);
1717                 if (target_node->has_async_transaction) {
1718                         target_list = &target_node->async_todo;
1719                         target_wait = NULL;
1720                 } else
1721                         target_node->has_async_transaction = 1;
1722         }
1723         t->work.type = BINDER_WORK_TRANSACTION;
1724         list_add_tail(&t->work.entry, target_list);
1725         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1726         list_add_tail(&tcomplete->entry, &thread->todo);
1727         if (target_wait)
1728                 wake_up_interruptible(target_wait);
1729         return;
1730
1731 err_get_unused_fd_failed:
1732 err_fget_failed:
1733 err_fd_not_allowed:
1734 err_binder_get_ref_for_node_failed:
1735 err_binder_get_ref_failed:
1736 err_binder_new_node_failed:
1737 err_bad_object_type:
1738 err_bad_offset:
1739 err_copy_data_failed:
1740         trace_binder_transaction_failed_buffer_release(t->buffer);
1741         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1742         t->buffer->transaction = NULL;
1743         binder_free_buf(target_proc, t->buffer);
1744 err_binder_alloc_buf_failed:
1745         kfree(tcomplete);
1746         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1747 err_alloc_tcomplete_failed:
1748         kfree(t);
1749         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1750 err_alloc_t_failed:
1751 err_bad_call_stack:
1752 err_empty_call_stack:
1753 err_dead_binder:
1754 err_invalid_target_handle:
1755 err_no_context_mgr_node:
1756         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1757                      "%d:%d transaction failed %d, size %lld-%lld\n",
1758                      proc->pid, thread->pid, return_error,
1759                      (u64)tr->data_size, (u64)tr->offsets_size);
1760
1761         {
1762                 struct binder_transaction_log_entry *fe;
1763
1764                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1765                 *fe = *e;
1766         }
1767
1768         BUG_ON(thread->return_error != BR_OK);
1769         if (in_reply_to) {
1770                 thread->return_error = BR_TRANSACTION_COMPLETE;
1771                 binder_send_failed_reply(in_reply_to, return_error);
1772         } else
1773                 thread->return_error = return_error;
1774 }
1775
1776 static int binder_thread_write(struct binder_proc *proc,
1777                         struct binder_thread *thread,
1778                         binder_uintptr_t binder_buffer, size_t size,
1779                         binder_size_t *consumed)
1780 {
1781         uint32_t cmd;
1782         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1783         void __user *ptr = buffer + *consumed;
1784         void __user *end = buffer + size;
1785
1786         while (ptr < end && thread->return_error == BR_OK) {
1787                 if (get_user(cmd, (uint32_t __user *)ptr))
1788                         return -EFAULT;
1789                 ptr += sizeof(uint32_t);
1790                 trace_binder_command(cmd);
1791                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1792                         binder_stats.bc[_IOC_NR(cmd)]++;
1793                         proc->stats.bc[_IOC_NR(cmd)]++;
1794                         thread->stats.bc[_IOC_NR(cmd)]++;
1795                 }
1796                 switch (cmd) {
1797                 case BC_INCREFS:
1798                 case BC_ACQUIRE:
1799                 case BC_RELEASE:
1800                 case BC_DECREFS: {
1801                         uint32_t target;
1802                         struct binder_ref *ref;
1803                         const char *debug_string;
1804
1805                         if (get_user(target, (uint32_t __user *)ptr))
1806                                 return -EFAULT;
1807                         ptr += sizeof(uint32_t);
1808                         if (target == 0 && binder_context_mgr_node &&
1809                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1810                                 ref = binder_get_ref_for_node(proc,
1811                                                binder_context_mgr_node);
1812                                 if (ref->desc != target) {
1813                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1814                                                 proc->pid, thread->pid,
1815                                                 ref->desc);
1816                                 }
1817                         } else
1818                                 ref = binder_get_ref(proc, target,
1819                                                      cmd == BC_ACQUIRE ||
1820                                                      cmd == BC_RELEASE);
1821                         if (ref == NULL) {
1822                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1823                                         proc->pid, thread->pid, target);
1824                                 break;
1825                         }
1826                         switch (cmd) {
1827                         case BC_INCREFS:
1828                                 debug_string = "IncRefs";
1829                                 binder_inc_ref(ref, 0, NULL);
1830                                 break;
1831                         case BC_ACQUIRE:
1832                                 debug_string = "Acquire";
1833                                 binder_inc_ref(ref, 1, NULL);
1834                                 break;
1835                         case BC_RELEASE:
1836                                 debug_string = "Release";
1837                                 binder_dec_ref(ref, 1);
1838                                 break;
1839                         case BC_DECREFS:
1840                         default:
1841                                 debug_string = "DecRefs";
1842                                 binder_dec_ref(ref, 0);
1843                                 break;
1844                         }
1845                         binder_debug(BINDER_DEBUG_USER_REFS,
1846                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1847                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1848                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1849                         break;
1850                 }
1851                 case BC_INCREFS_DONE:
1852                 case BC_ACQUIRE_DONE: {
1853                         binder_uintptr_t node_ptr;
1854                         binder_uintptr_t cookie;
1855                         struct binder_node *node;
1856
1857                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1858                                 return -EFAULT;
1859                         ptr += sizeof(binder_uintptr_t);
1860                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1861                                 return -EFAULT;
1862                         ptr += sizeof(binder_uintptr_t);
1863                         node = binder_get_node(proc, node_ptr);
1864                         if (node == NULL) {
1865                                 binder_user_error("%d:%d %s u%016llx no match\n",
1866                                         proc->pid, thread->pid,
1867                                         cmd == BC_INCREFS_DONE ?
1868                                         "BC_INCREFS_DONE" :
1869                                         "BC_ACQUIRE_DONE",
1870                                         (u64)node_ptr);
1871                                 break;
1872                         }
1873                         if (cookie != node->cookie) {
1874                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1875                                         proc->pid, thread->pid,
1876                                         cmd == BC_INCREFS_DONE ?
1877                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1878                                         (u64)node_ptr, node->debug_id,
1879                                         (u64)cookie, (u64)node->cookie);
1880                                 break;
1881                         }
1882                         if (cmd == BC_ACQUIRE_DONE) {
1883                                 if (node->pending_strong_ref == 0) {
1884                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1885                                                 proc->pid, thread->pid,
1886                                                 node->debug_id);
1887                                         break;
1888                                 }
1889                                 node->pending_strong_ref = 0;
1890                         } else {
1891                                 if (node->pending_weak_ref == 0) {
1892                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1893                                                 proc->pid, thread->pid,
1894                                                 node->debug_id);
1895                                         break;
1896                                 }
1897                                 node->pending_weak_ref = 0;
1898                         }
1899                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1900                         binder_debug(BINDER_DEBUG_USER_REFS,
1901                                      "%d:%d %s node %d ls %d lw %d\n",
1902                                      proc->pid, thread->pid,
1903                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1904                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1905                         break;
1906                 }
1907                 case BC_ATTEMPT_ACQUIRE:
1908                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1909                         return -EINVAL;
1910                 case BC_ACQUIRE_RESULT:
1911                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1912                         return -EINVAL;
1913
1914                 case BC_FREE_BUFFER: {
1915                         binder_uintptr_t data_ptr;
1916                         struct binder_buffer *buffer;
1917
1918                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1919                                 return -EFAULT;
1920                         ptr += sizeof(binder_uintptr_t);
1921
1922                         buffer = binder_buffer_lookup(proc, data_ptr);
1923                         if (buffer == NULL) {
1924                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1925                                         proc->pid, thread->pid, (u64)data_ptr);
1926                                 break;
1927                         }
1928                         if (!buffer->allow_user_free) {
1929                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1930                                         proc->pid, thread->pid, (u64)data_ptr);
1931                                 break;
1932                         }
1933                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1934                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1935                                      proc->pid, thread->pid, (u64)data_ptr,
1936                                      buffer->debug_id,
1937                                      buffer->transaction ? "active" : "finished");
1938
1939                         if (buffer->transaction) {
1940                                 buffer->transaction->buffer = NULL;
1941                                 buffer->transaction = NULL;
1942                         }
1943                         if (buffer->async_transaction && buffer->target_node) {
1944                                 BUG_ON(!buffer->target_node->has_async_transaction);
1945                                 if (list_empty(&buffer->target_node->async_todo))
1946                                         buffer->target_node->has_async_transaction = 0;
1947                                 else
1948                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1949                         }
1950                         trace_binder_transaction_buffer_release(buffer);
1951                         binder_transaction_buffer_release(proc, buffer, NULL);
1952                         binder_free_buf(proc, buffer);
1953                         break;
1954                 }
1955
1956                 case BC_TRANSACTION:
1957                 case BC_REPLY: {
1958                         struct binder_transaction_data tr;
1959
1960                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1961                                 return -EFAULT;
1962                         ptr += sizeof(tr);
1963                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1964                         break;
1965                 }
1966
1967                 case BC_REGISTER_LOOPER:
1968                         binder_debug(BINDER_DEBUG_THREADS,
1969                                      "%d:%d BC_REGISTER_LOOPER\n",
1970                                      proc->pid, thread->pid);
1971                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1972                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1973                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1974                                         proc->pid, thread->pid);
1975                         } else if (proc->requested_threads == 0) {
1976                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1977                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1978                                         proc->pid, thread->pid);
1979                         } else {
1980                                 proc->requested_threads--;
1981                                 proc->requested_threads_started++;
1982                         }
1983                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1984                         break;
1985                 case BC_ENTER_LOOPER:
1986                         binder_debug(BINDER_DEBUG_THREADS,
1987                                      "%d:%d BC_ENTER_LOOPER\n",
1988                                      proc->pid, thread->pid);
1989                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1990                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1991                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1992                                         proc->pid, thread->pid);
1993                         }
1994                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1995                         break;
1996                 case BC_EXIT_LOOPER:
1997                         binder_debug(BINDER_DEBUG_THREADS,
1998                                      "%d:%d BC_EXIT_LOOPER\n",
1999                                      proc->pid, thread->pid);
2000                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
2001                         break;
2002
2003                 case BC_REQUEST_DEATH_NOTIFICATION:
2004                 case BC_CLEAR_DEATH_NOTIFICATION: {
2005                         uint32_t target;
2006                         binder_uintptr_t cookie;
2007                         struct binder_ref *ref;
2008                         struct binder_ref_death *death;
2009
2010                         if (get_user(target, (uint32_t __user *)ptr))
2011                                 return -EFAULT;
2012                         ptr += sizeof(uint32_t);
2013                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2014                                 return -EFAULT;
2015                         ptr += sizeof(binder_uintptr_t);
2016                         ref = binder_get_ref(proc, target, false);
2017                         if (ref == NULL) {
2018                                 binder_user_error("%d:%d %s invalid ref %d\n",
2019                                         proc->pid, thread->pid,
2020                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2021                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2022                                         "BC_CLEAR_DEATH_NOTIFICATION",
2023                                         target);
2024                                 break;
2025                         }
2026
2027                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2028                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2029                                      proc->pid, thread->pid,
2030                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2031                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2032                                      "BC_CLEAR_DEATH_NOTIFICATION",
2033                                      (u64)cookie, ref->debug_id, ref->desc,
2034                                      ref->strong, ref->weak, ref->node->debug_id);
2035
2036                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2037                                 if (ref->death) {
2038                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2039                                                 proc->pid, thread->pid);
2040                                         break;
2041                                 }
2042                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2043                                 if (death == NULL) {
2044                                         thread->return_error = BR_ERROR;
2045                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2046                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2047                                                      proc->pid, thread->pid);
2048                                         break;
2049                                 }
2050                                 binder_stats_created(BINDER_STAT_DEATH);
2051                                 INIT_LIST_HEAD(&death->work.entry);
2052                                 death->cookie = cookie;
2053                                 ref->death = death;
2054                                 if (ref->node->proc == NULL) {
2055                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2056                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2057                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2058                                         } else {
2059                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2060                                                 wake_up_interruptible(&proc->wait);
2061                                         }
2062                                 }
2063                         } else {
2064                                 if (ref->death == NULL) {
2065                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2066                                                 proc->pid, thread->pid);
2067                                         break;
2068                                 }
2069                                 death = ref->death;
2070                                 if (death->cookie != cookie) {
2071                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2072                                                 proc->pid, thread->pid,
2073                                                 (u64)death->cookie,
2074                                                 (u64)cookie);
2075                                         break;
2076                                 }
2077                                 ref->death = NULL;
2078                                 if (list_empty(&death->work.entry)) {
2079                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2080                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2081                                                 list_add_tail(&death->work.entry, &thread->todo);
2082                                         } else {
2083                                                 list_add_tail(&death->work.entry, &proc->todo);
2084                                                 wake_up_interruptible(&proc->wait);
2085                                         }
2086                                 } else {
2087                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2088                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2089                                 }
2090                         }
2091                 } break;
2092                 case BC_DEAD_BINDER_DONE: {
2093                         struct binder_work *w;
2094                         binder_uintptr_t cookie;
2095                         struct binder_ref_death *death = NULL;
2096
2097                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2098                                 return -EFAULT;
2099
2100                         ptr += sizeof(cookie);
2101                         list_for_each_entry(w, &proc->delivered_death, entry) {
2102                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2103
2104                                 if (tmp_death->cookie == cookie) {
2105                                         death = tmp_death;
2106                                         break;
2107                                 }
2108                         }
2109                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2110                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2111                                      proc->pid, thread->pid, (u64)cookie,
2112                                      death);
2113                         if (death == NULL) {
2114                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2115                                         proc->pid, thread->pid, (u64)cookie);
2116                                 break;
2117                         }
2118
2119                         list_del_init(&death->work.entry);
2120                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2121                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2122                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2123                                         list_add_tail(&death->work.entry, &thread->todo);
2124                                 } else {
2125                                         list_add_tail(&death->work.entry, &proc->todo);
2126                                         wake_up_interruptible(&proc->wait);
2127                                 }
2128                         }
2129                 } break;
2130
2131                 default:
2132                         pr_err("%d:%d unknown command %d\n",
2133                                proc->pid, thread->pid, cmd);
2134                         return -EINVAL;
2135                 }
2136                 *consumed = ptr - buffer;
2137         }
2138         return 0;
2139 }
2140
2141 static void binder_stat_br(struct binder_proc *proc,
2142                            struct binder_thread *thread, uint32_t cmd)
2143 {
2144         trace_binder_return(cmd);
2145         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2146                 binder_stats.br[_IOC_NR(cmd)]++;
2147                 proc->stats.br[_IOC_NR(cmd)]++;
2148                 thread->stats.br[_IOC_NR(cmd)]++;
2149         }
2150 }
2151
2152 static int binder_has_proc_work(struct binder_proc *proc,
2153                                 struct binder_thread *thread)
2154 {
2155         return !list_empty(&proc->todo) ||
2156                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2157 }
2158
2159 static int binder_has_thread_work(struct binder_thread *thread)
2160 {
2161         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2162                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2163 }
2164
2165 static int binder_thread_read(struct binder_proc *proc,
2166                               struct binder_thread *thread,
2167                               binder_uintptr_t binder_buffer, size_t size,
2168                               binder_size_t *consumed, int non_block)
2169 {
2170         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2171         void __user *ptr = buffer + *consumed;
2172         void __user *end = buffer + size;
2173
2174         int ret = 0;
2175         int wait_for_proc_work;
2176
2177         if (*consumed == 0) {
2178                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2179                         return -EFAULT;
2180                 ptr += sizeof(uint32_t);
2181         }
2182
2183 retry:
2184         wait_for_proc_work = thread->transaction_stack == NULL &&
2185                                 list_empty(&thread->todo);
2186
2187         if (thread->return_error != BR_OK && ptr < end) {
2188                 if (thread->return_error2 != BR_OK) {
2189                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2190                                 return -EFAULT;
2191                         ptr += sizeof(uint32_t);
2192                         binder_stat_br(proc, thread, thread->return_error2);
2193                         if (ptr == end)
2194                                 goto done;
2195                         thread->return_error2 = BR_OK;
2196                 }
2197                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2198                         return -EFAULT;
2199                 ptr += sizeof(uint32_t);
2200                 binder_stat_br(proc, thread, thread->return_error);
2201                 thread->return_error = BR_OK;
2202                 goto done;
2203         }
2204
2205
2206         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2207         if (wait_for_proc_work)
2208                 proc->ready_threads++;
2209
2210         binder_unlock(__func__);
2211
2212         trace_binder_wait_for_work(wait_for_proc_work,
2213                                    !!thread->transaction_stack,
2214                                    !list_empty(&thread->todo));
2215         if (wait_for_proc_work) {
2216                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2217                                         BINDER_LOOPER_STATE_ENTERED))) {
2218                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2219                                 proc->pid, thread->pid, thread->looper);
2220                         wait_event_interruptible(binder_user_error_wait,
2221                                                  binder_stop_on_user_error < 2);
2222                 }
2223                 binder_set_nice(proc->default_priority);
2224                 if (non_block) {
2225                         if (!binder_has_proc_work(proc, thread))
2226                                 ret = -EAGAIN;
2227                 } else
2228                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2229         } else {
2230                 if (non_block) {
2231                         if (!binder_has_thread_work(thread))
2232                                 ret = -EAGAIN;
2233                 } else
2234                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2235         }
2236
2237         binder_lock(__func__);
2238
2239         if (wait_for_proc_work)
2240                 proc->ready_threads--;
2241         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2242
2243         if (ret)
2244                 return ret;
2245
2246         while (1) {
2247                 uint32_t cmd;
2248                 struct binder_transaction_data tr;
2249                 struct binder_work *w;
2250                 struct binder_transaction *t = NULL;
2251
2252                 if (!list_empty(&thread->todo)) {
2253                         w = list_first_entry(&thread->todo, struct binder_work,
2254                                              entry);
2255                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2256                         w = list_first_entry(&proc->todo, struct binder_work,
2257                                              entry);
2258                 } else {
2259                         /* no data added */
2260                         if (ptr - buffer == 4 &&
2261                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2262                                 goto retry;
2263                         break;
2264                 }
2265
2266                 if (end - ptr < sizeof(tr) + 4)
2267                         break;
2268
2269                 switch (w->type) {
2270                 case BINDER_WORK_TRANSACTION: {
2271                         t = container_of(w, struct binder_transaction, work);
2272                 } break;
2273                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2274                         cmd = BR_TRANSACTION_COMPLETE;
2275                         if (put_user(cmd, (uint32_t __user *)ptr))
2276                                 return -EFAULT;
2277                         ptr += sizeof(uint32_t);
2278
2279                         binder_stat_br(proc, thread, cmd);
2280                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2281                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2282                                      proc->pid, thread->pid);
2283
2284                         list_del(&w->entry);
2285                         kfree(w);
2286                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2287                 } break;
2288                 case BINDER_WORK_NODE: {
2289                         struct binder_node *node = container_of(w, struct binder_node, work);
2290                         uint32_t cmd = BR_NOOP;
2291                         const char *cmd_name;
2292                         int strong = node->internal_strong_refs || node->local_strong_refs;
2293                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2294
2295                         if (weak && !node->has_weak_ref) {
2296                                 cmd = BR_INCREFS;
2297                                 cmd_name = "BR_INCREFS";
2298                                 node->has_weak_ref = 1;
2299                                 node->pending_weak_ref = 1;
2300                                 node->local_weak_refs++;
2301                         } else if (strong && !node->has_strong_ref) {
2302                                 cmd = BR_ACQUIRE;
2303                                 cmd_name = "BR_ACQUIRE";
2304                                 node->has_strong_ref = 1;
2305                                 node->pending_strong_ref = 1;
2306                                 node->local_strong_refs++;
2307                         } else if (!strong && node->has_strong_ref) {
2308                                 cmd = BR_RELEASE;
2309                                 cmd_name = "BR_RELEASE";
2310                                 node->has_strong_ref = 0;
2311                         } else if (!weak && node->has_weak_ref) {
2312                                 cmd = BR_DECREFS;
2313                                 cmd_name = "BR_DECREFS";
2314                                 node->has_weak_ref = 0;
2315                         }
2316                         if (cmd != BR_NOOP) {
2317                                 if (put_user(cmd, (uint32_t __user *)ptr))
2318                                         return -EFAULT;
2319                                 ptr += sizeof(uint32_t);
2320                                 if (put_user(node->ptr,
2321                                              (binder_uintptr_t __user *)ptr))
2322                                         return -EFAULT;
2323                                 ptr += sizeof(binder_uintptr_t);
2324                                 if (put_user(node->cookie,
2325                                              (binder_uintptr_t __user *)ptr))
2326                                         return -EFAULT;
2327                                 ptr += sizeof(binder_uintptr_t);
2328
2329                                 binder_stat_br(proc, thread, cmd);
2330                                 binder_debug(BINDER_DEBUG_USER_REFS,
2331                                              "%d:%d %s %d u%016llx c%016llx\n",
2332                                              proc->pid, thread->pid, cmd_name,
2333                                              node->debug_id,
2334                                              (u64)node->ptr, (u64)node->cookie);
2335                         } else {
2336                                 list_del_init(&w->entry);
2337                                 if (!weak && !strong) {
2338                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2339                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2340                                                      proc->pid, thread->pid,
2341                                                      node->debug_id,
2342                                                      (u64)node->ptr,
2343                                                      (u64)node->cookie);
2344                                         rb_erase(&node->rb_node, &proc->nodes);
2345                                         kfree(node);
2346                                         binder_stats_deleted(BINDER_STAT_NODE);
2347                                 } else {
2348                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2349                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2350                                                      proc->pid, thread->pid,
2351                                                      node->debug_id,
2352                                                      (u64)node->ptr,
2353                                                      (u64)node->cookie);
2354                                 }
2355                         }
2356                 } break;
2357                 case BINDER_WORK_DEAD_BINDER:
2358                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2359                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2360                         struct binder_ref_death *death;
2361                         uint32_t cmd;
2362
2363                         death = container_of(w, struct binder_ref_death, work);
2364                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2365                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2366                         else
2367                                 cmd = BR_DEAD_BINDER;
2368                         if (put_user(cmd, (uint32_t __user *)ptr))
2369                                 return -EFAULT;
2370                         ptr += sizeof(uint32_t);
2371                         if (put_user(death->cookie,
2372                                      (binder_uintptr_t __user *)ptr))
2373                                 return -EFAULT;
2374                         ptr += sizeof(binder_uintptr_t);
2375                         binder_stat_br(proc, thread, cmd);
2376                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2377                                      "%d:%d %s %016llx\n",
2378                                       proc->pid, thread->pid,
2379                                       cmd == BR_DEAD_BINDER ?
2380                                       "BR_DEAD_BINDER" :
2381                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2382                                       (u64)death->cookie);
2383
2384                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2385                                 list_del(&w->entry);
2386                                 kfree(death);
2387                                 binder_stats_deleted(BINDER_STAT_DEATH);
2388                         } else
2389                                 list_move(&w->entry, &proc->delivered_death);
2390                         if (cmd == BR_DEAD_BINDER)
2391                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2392                 } break;
2393                 }
2394
2395                 if (!t)
2396                         continue;
2397
2398                 BUG_ON(t->buffer == NULL);
2399                 if (t->buffer->target_node) {
2400                         struct binder_node *target_node = t->buffer->target_node;
2401
2402                         tr.target.ptr = target_node->ptr;
2403                         tr.cookie =  target_node->cookie;
2404                         t->saved_priority = task_nice(current);
2405                         if (t->priority < target_node->min_priority &&
2406                             !(t->flags & TF_ONE_WAY))
2407                                 binder_set_nice(t->priority);
2408                         else if (!(t->flags & TF_ONE_WAY) ||
2409                                  t->saved_priority > target_node->min_priority)
2410                                 binder_set_nice(target_node->min_priority);
2411                         cmd = BR_TRANSACTION;
2412                 } else {
2413                         tr.target.ptr = 0;
2414                         tr.cookie = 0;
2415                         cmd = BR_REPLY;
2416                 }
2417                 tr.code = t->code;
2418                 tr.flags = t->flags;
2419                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2420
2421                 if (t->from) {
2422                         struct task_struct *sender = t->from->proc->tsk;
2423
2424                         tr.sender_pid = task_tgid_nr_ns(sender,
2425                                                         task_active_pid_ns(current));
2426                 } else {
2427                         tr.sender_pid = 0;
2428                 }
2429
2430                 tr.data_size = t->buffer->data_size;
2431                 tr.offsets_size = t->buffer->offsets_size;
2432                 tr.data.ptr.buffer = (binder_uintptr_t)(
2433                                         (uintptr_t)t->buffer->data +
2434                                         proc->user_buffer_offset);
2435                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2436                                         ALIGN(t->buffer->data_size,
2437                                             sizeof(void *));
2438
2439                 if (put_user(cmd, (uint32_t __user *)ptr))
2440                         return -EFAULT;
2441                 ptr += sizeof(uint32_t);
2442                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2443                         return -EFAULT;
2444                 ptr += sizeof(tr);
2445
2446                 trace_binder_transaction_received(t);
2447                 binder_stat_br(proc, thread, cmd);
2448                 binder_debug(BINDER_DEBUG_TRANSACTION,
2449                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2450                              proc->pid, thread->pid,
2451                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2452                              "BR_REPLY",
2453                              t->debug_id, t->from ? t->from->proc->pid : 0,
2454                              t->from ? t->from->pid : 0, cmd,
2455                              t->buffer->data_size, t->buffer->offsets_size,
2456                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2457
2458                 list_del(&t->work.entry);
2459                 t->buffer->allow_user_free = 1;
2460                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2461                         t->to_parent = thread->transaction_stack;
2462                         t->to_thread = thread;
2463                         thread->transaction_stack = t;
2464                 } else {
2465                         t->buffer->transaction = NULL;
2466                         kfree(t);
2467                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2468                 }
2469                 break;
2470         }
2471
2472 done:
2473
2474         *consumed = ptr - buffer;
2475         if (proc->requested_threads + proc->ready_threads == 0 &&
2476             proc->requested_threads_started < proc->max_threads &&
2477             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2478              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2479              /*spawn a new thread if we leave this out */) {
2480                 proc->requested_threads++;
2481                 binder_debug(BINDER_DEBUG_THREADS,
2482                              "%d:%d BR_SPAWN_LOOPER\n",
2483                              proc->pid, thread->pid);
2484                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2485                         return -EFAULT;
2486                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2487         }
2488         return 0;
2489 }
2490
2491 static void binder_release_work(struct list_head *list)
2492 {
2493         struct binder_work *w;
2494
2495         while (!list_empty(list)) {
2496                 w = list_first_entry(list, struct binder_work, entry);
2497                 list_del_init(&w->entry);
2498                 switch (w->type) {
2499                 case BINDER_WORK_TRANSACTION: {
2500                         struct binder_transaction *t;
2501
2502                         t = container_of(w, struct binder_transaction, work);
2503                         if (t->buffer->target_node &&
2504                             !(t->flags & TF_ONE_WAY)) {
2505                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2506                         } else {
2507                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2508                                         "undelivered transaction %d\n",
2509                                         t->debug_id);
2510                                 t->buffer->transaction = NULL;
2511                                 kfree(t);
2512                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2513                         }
2514                 } break;
2515                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2516                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2517                                 "undelivered TRANSACTION_COMPLETE\n");
2518                         kfree(w);
2519                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2520                 } break;
2521                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2522                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2523                         struct binder_ref_death *death;
2524
2525                         death = container_of(w, struct binder_ref_death, work);
2526                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2527                                 "undelivered death notification, %016llx\n",
2528                                 (u64)death->cookie);
2529                         kfree(death);
2530                         binder_stats_deleted(BINDER_STAT_DEATH);
2531                 } break;
2532                 default:
2533                         pr_err("unexpected work type, %d, not freed\n",
2534                                w->type);
2535                         break;
2536                 }
2537         }
2538
2539 }
2540
2541 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2542 {
2543         struct binder_thread *thread = NULL;
2544         struct rb_node *parent = NULL;
2545         struct rb_node **p = &proc->threads.rb_node;
2546
2547         while (*p) {
2548                 parent = *p;
2549                 thread = rb_entry(parent, struct binder_thread, rb_node);
2550
2551                 if (current->pid < thread->pid)
2552                         p = &(*p)->rb_left;
2553                 else if (current->pid > thread->pid)
2554                         p = &(*p)->rb_right;
2555                 else
2556                         break;
2557         }
2558         if (*p == NULL) {
2559                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2560                 if (thread == NULL)
2561                         return NULL;
2562                 binder_stats_created(BINDER_STAT_THREAD);
2563                 thread->proc = proc;
2564                 thread->pid = current->pid;
2565                 init_waitqueue_head(&thread->wait);
2566                 INIT_LIST_HEAD(&thread->todo);
2567                 rb_link_node(&thread->rb_node, parent, p);
2568                 rb_insert_color(&thread->rb_node, &proc->threads);
2569                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2570                 thread->return_error = BR_OK;
2571                 thread->return_error2 = BR_OK;
2572         }
2573         return thread;
2574 }
2575
2576 static int binder_free_thread(struct binder_proc *proc,
2577                               struct binder_thread *thread)
2578 {
2579         struct binder_transaction *t;
2580         struct binder_transaction *send_reply = NULL;
2581         int active_transactions = 0;
2582
2583         rb_erase(&thread->rb_node, &proc->threads);
2584         t = thread->transaction_stack;
2585         if (t && t->to_thread == thread)
2586                 send_reply = t;
2587         while (t) {
2588                 active_transactions++;
2589                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2590                              "release %d:%d transaction %d %s, still active\n",
2591                               proc->pid, thread->pid,
2592                              t->debug_id,
2593                              (t->to_thread == thread) ? "in" : "out");
2594
2595                 if (t->to_thread == thread) {
2596                         t->to_proc = NULL;
2597                         t->to_thread = NULL;
2598                         if (t->buffer) {
2599                                 t->buffer->transaction = NULL;
2600                                 t->buffer = NULL;
2601                         }
2602                         t = t->to_parent;
2603                 } else if (t->from == thread) {
2604                         t->from = NULL;
2605                         t = t->from_parent;
2606                 } else
2607                         BUG();
2608         }
2609         if (send_reply)
2610                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2611         binder_release_work(&thread->todo);
2612         kfree(thread);
2613         binder_stats_deleted(BINDER_STAT_THREAD);
2614         return active_transactions;
2615 }
2616
2617 static unsigned int binder_poll(struct file *filp,
2618                                 struct poll_table_struct *wait)
2619 {
2620         struct binder_proc *proc = filp->private_data;
2621         struct binder_thread *thread = NULL;
2622         int wait_for_proc_work;
2623
2624         binder_lock(__func__);
2625
2626         thread = binder_get_thread(proc);
2627
2628         wait_for_proc_work = thread->transaction_stack == NULL &&
2629                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2630
2631         binder_unlock(__func__);
2632
2633         if (wait_for_proc_work) {
2634                 if (binder_has_proc_work(proc, thread))
2635                         return POLLIN;
2636                 poll_wait(filp, &proc->wait, wait);
2637                 if (binder_has_proc_work(proc, thread))
2638                         return POLLIN;
2639         } else {
2640                 if (binder_has_thread_work(thread))
2641                         return POLLIN;
2642                 poll_wait(filp, &thread->wait, wait);
2643                 if (binder_has_thread_work(thread))
2644                         return POLLIN;
2645         }
2646         return 0;
2647 }
2648
2649 static int binder_ioctl_write_read(struct file *filp,
2650                                 unsigned int cmd, unsigned long arg,
2651                                 struct binder_thread *thread)
2652 {
2653         int ret = 0;
2654         struct binder_proc *proc = filp->private_data;
2655         unsigned int size = _IOC_SIZE(cmd);
2656         void __user *ubuf = (void __user *)arg;
2657         struct binder_write_read bwr;
2658
2659         if (size != sizeof(struct binder_write_read)) {
2660                 ret = -EINVAL;
2661                 goto out;
2662         }
2663         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2664                 ret = -EFAULT;
2665                 goto out;
2666         }
2667         binder_debug(BINDER_DEBUG_READ_WRITE,
2668                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2669                      proc->pid, thread->pid,
2670                      (u64)bwr.write_size, (u64)bwr.write_buffer,
2671                      (u64)bwr.read_size, (u64)bwr.read_buffer);
2672
2673         if (bwr.write_size > 0) {
2674                 ret = binder_thread_write(proc, thread,
2675                                           bwr.write_buffer,
2676                                           bwr.write_size,
2677                                           &bwr.write_consumed);
2678                 trace_binder_write_done(ret);
2679                 if (ret < 0) {
2680                         bwr.read_consumed = 0;
2681                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2682                                 ret = -EFAULT;
2683                         goto out;
2684                 }
2685         }
2686         if (bwr.read_size > 0) {
2687                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2688                                          bwr.read_size,
2689                                          &bwr.read_consumed,
2690                                          filp->f_flags & O_NONBLOCK);
2691                 trace_binder_read_done(ret);
2692                 if (!list_empty(&proc->todo))
2693                         wake_up_interruptible(&proc->wait);
2694                 if (ret < 0) {
2695                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2696                                 ret = -EFAULT;
2697                         goto out;
2698                 }
2699         }
2700         binder_debug(BINDER_DEBUG_READ_WRITE,
2701                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2702                      proc->pid, thread->pid,
2703                      (u64)bwr.write_consumed, (u64)bwr.write_size,
2704                      (u64)bwr.read_consumed, (u64)bwr.read_size);
2705         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2706                 ret = -EFAULT;
2707                 goto out;
2708         }
2709 out:
2710         return ret;
2711 }
2712
2713 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2714 {
2715         int ret = 0;
2716         struct binder_proc *proc = filp->private_data;
2717         kuid_t curr_euid = current_euid();
2718
2719         if (binder_context_mgr_node != NULL) {
2720                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2721                 ret = -EBUSY;
2722                 goto out;
2723         }
2724         ret = security_binder_set_context_mgr(proc->tsk);
2725         if (ret < 0)
2726                 goto out;
2727         if (uid_valid(binder_context_mgr_uid)) {
2728                 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2729                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2730                                from_kuid(&init_user_ns, curr_euid),
2731                                from_kuid(&init_user_ns,
2732                                         binder_context_mgr_uid));
2733                         ret = -EPERM;
2734                         goto out;
2735                 }
2736         } else {
2737                 binder_context_mgr_uid = curr_euid;
2738         }
2739         binder_context_mgr_node = binder_new_node(proc, 0, 0);
2740         if (binder_context_mgr_node == NULL) {
2741                 ret = -ENOMEM;
2742                 goto out;
2743         }
2744         binder_context_mgr_node->local_weak_refs++;
2745         binder_context_mgr_node->local_strong_refs++;
2746         binder_context_mgr_node->has_strong_ref = 1;
2747         binder_context_mgr_node->has_weak_ref = 1;
2748 out:
2749         return ret;
2750 }
2751
2752 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2753 {
2754         int ret;
2755         struct binder_proc *proc = filp->private_data;
2756         struct binder_thread *thread;
2757         unsigned int size = _IOC_SIZE(cmd);
2758         void __user *ubuf = (void __user *)arg;
2759
2760         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2761                         proc->pid, current->pid, cmd, arg);*/
2762
2763         if (unlikely(current->mm != proc->vma_vm_mm)) {
2764                 pr_err("current mm mismatch proc mm\n");
2765                 return -EINVAL;
2766         }
2767         trace_binder_ioctl(cmd, arg);
2768
2769         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2770         if (ret)
2771                 goto err_unlocked;
2772
2773         binder_lock(__func__);
2774         thread = binder_get_thread(proc);
2775         if (thread == NULL) {
2776                 ret = -ENOMEM;
2777                 goto err;
2778         }
2779
2780         switch (cmd) {
2781         case BINDER_WRITE_READ:
2782                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2783                 if (ret)
2784                         goto err;
2785                 break;
2786         case BINDER_SET_MAX_THREADS:
2787                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2788                         ret = -EINVAL;
2789                         goto err;
2790                 }
2791                 break;
2792         case BINDER_SET_CONTEXT_MGR:
2793                 ret = binder_ioctl_set_ctx_mgr(filp);
2794                 if (ret)
2795                         goto err;
2796                 break;
2797         case BINDER_THREAD_EXIT:
2798                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2799                              proc->pid, thread->pid);
2800                 binder_free_thread(proc, thread);
2801                 thread = NULL;
2802                 break;
2803         case BINDER_VERSION: {
2804                 struct binder_version __user *ver = ubuf;
2805
2806                 if (size != sizeof(struct binder_version)) {
2807                         ret = -EINVAL;
2808                         goto err;
2809                 }
2810                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2811                              &ver->protocol_version)) {
2812                         ret = -EINVAL;
2813                         goto err;
2814                 }
2815                 break;
2816         }
2817         default:
2818                 ret = -EINVAL;
2819                 goto err;
2820         }
2821         ret = 0;
2822 err:
2823         if (thread)
2824                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2825         binder_unlock(__func__);
2826         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2827         if (ret && ret != -ERESTARTSYS)
2828                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2829 err_unlocked:
2830         trace_binder_ioctl_done(ret);
2831         return ret;
2832 }
2833
2834 static void binder_vma_open(struct vm_area_struct *vma)
2835 {
2836         struct binder_proc *proc = vma->vm_private_data;
2837
2838         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2839                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2840                      proc->pid, vma->vm_start, vma->vm_end,
2841                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2842                      (unsigned long)pgprot_val(vma->vm_page_prot));
2843 }
2844
2845 static void binder_vma_close(struct vm_area_struct *vma)
2846 {
2847         struct binder_proc *proc = vma->vm_private_data;
2848
2849         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2850                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2851                      proc->pid, vma->vm_start, vma->vm_end,
2852                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2853                      (unsigned long)pgprot_val(vma->vm_page_prot));
2854         proc->vma = NULL;
2855         proc->vma_vm_mm = NULL;
2856         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2857 }
2858
2859 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2860 {
2861         return VM_FAULT_SIGBUS;
2862 }
2863
2864 static const struct vm_operations_struct binder_vm_ops = {
2865         .open = binder_vma_open,
2866         .close = binder_vma_close,
2867         .fault = binder_vm_fault,
2868 };
2869
2870 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2871 {
2872         int ret;
2873         struct vm_struct *area;
2874         struct binder_proc *proc = filp->private_data;
2875         const char *failure_string;
2876         struct binder_buffer *buffer;
2877
2878         if (proc->tsk != current)
2879                 return -EINVAL;
2880
2881         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2882                 vma->vm_end = vma->vm_start + SZ_4M;
2883
2884         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2885                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2886                      proc->pid, vma->vm_start, vma->vm_end,
2887                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2888                      (unsigned long)pgprot_val(vma->vm_page_prot));
2889
2890         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2891                 ret = -EPERM;
2892                 failure_string = "bad vm_flags";
2893                 goto err_bad_arg;
2894         }
2895         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2896
2897         mutex_lock(&binder_mmap_lock);
2898         if (proc->buffer) {
2899                 ret = -EBUSY;
2900                 failure_string = "already mapped";
2901                 goto err_already_mapped;
2902         }
2903
2904         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2905         if (area == NULL) {
2906                 ret = -ENOMEM;
2907                 failure_string = "get_vm_area";
2908                 goto err_get_vm_area_failed;
2909         }
2910         proc->buffer = area->addr;
2911         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2912         mutex_unlock(&binder_mmap_lock);
2913
2914 #ifdef CONFIG_CPU_CACHE_VIPT
2915         if (cache_is_vipt_aliasing()) {
2916                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2917                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2918                         vma->vm_start += PAGE_SIZE;
2919                 }
2920         }
2921 #endif
2922         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2923         if (proc->pages == NULL) {
2924                 ret = -ENOMEM;
2925                 failure_string = "alloc page array";
2926                 goto err_alloc_pages_failed;
2927         }
2928         proc->buffer_size = vma->vm_end - vma->vm_start;
2929
2930         vma->vm_ops = &binder_vm_ops;
2931         vma->vm_private_data = proc;
2932
2933         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2934                 ret = -ENOMEM;
2935                 failure_string = "alloc small buf";
2936                 goto err_alloc_small_buf_failed;
2937         }
2938         buffer = proc->buffer;
2939         INIT_LIST_HEAD(&proc->buffers);
2940         list_add(&buffer->entry, &proc->buffers);
2941         buffer->free = 1;
2942         binder_insert_free_buffer(proc, buffer);
2943         proc->free_async_space = proc->buffer_size / 2;
2944         barrier();
2945         proc->files = get_files_struct(current);
2946         proc->vma = vma;
2947         proc->vma_vm_mm = vma->vm_mm;
2948
2949         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2950                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2951         return 0;
2952
2953 err_alloc_small_buf_failed:
2954         kfree(proc->pages);
2955         proc->pages = NULL;
2956 err_alloc_pages_failed:
2957         mutex_lock(&binder_mmap_lock);
2958         vfree(proc->buffer);
2959         proc->buffer = NULL;
2960 err_get_vm_area_failed:
2961 err_already_mapped:
2962         mutex_unlock(&binder_mmap_lock);
2963 err_bad_arg:
2964         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2965                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2966         return ret;
2967 }
2968
2969 static int binder_open(struct inode *nodp, struct file *filp)
2970 {
2971         struct binder_proc *proc;
2972
2973         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2974                      current->group_leader->pid, current->pid);
2975
2976         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2977         if (proc == NULL)
2978                 return -ENOMEM;
2979         get_task_struct(current);
2980         proc->tsk = current;
2981         proc->vma_vm_mm = current->mm;
2982         INIT_LIST_HEAD(&proc->todo);
2983         init_waitqueue_head(&proc->wait);
2984         proc->default_priority = task_nice(current);
2985
2986         binder_lock(__func__);
2987
2988         binder_stats_created(BINDER_STAT_PROC);
2989         hlist_add_head(&proc->proc_node, &binder_procs);
2990         proc->pid = current->group_leader->pid;
2991         INIT_LIST_HEAD(&proc->delivered_death);
2992         filp->private_data = proc;
2993
2994         binder_unlock(__func__);
2995
2996         if (binder_debugfs_dir_entry_proc) {
2997                 char strbuf[11];
2998
2999                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3000                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3001                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
3002         }
3003
3004         return 0;
3005 }
3006
3007 static int binder_flush(struct file *filp, fl_owner_t id)
3008 {
3009         struct binder_proc *proc = filp->private_data;
3010
3011         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3012
3013         return 0;
3014 }
3015
3016 static void binder_deferred_flush(struct binder_proc *proc)
3017 {
3018         struct rb_node *n;
3019         int wake_count = 0;
3020
3021         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3022                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3023
3024                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3025                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3026                         wake_up_interruptible(&thread->wait);
3027                         wake_count++;
3028                 }
3029         }
3030         wake_up_interruptible_all(&proc->wait);
3031
3032         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3033                      "binder_flush: %d woke %d threads\n", proc->pid,
3034                      wake_count);
3035 }
3036
3037 static int binder_release(struct inode *nodp, struct file *filp)
3038 {
3039         struct binder_proc *proc = filp->private_data;
3040
3041         debugfs_remove(proc->debugfs_entry);
3042         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3043
3044         return 0;
3045 }
3046
3047 static int binder_node_release(struct binder_node *node, int refs)
3048 {
3049         struct binder_ref *ref;
3050         int death = 0;
3051
3052         list_del_init(&node->work.entry);
3053         binder_release_work(&node->async_todo);
3054
3055         if (hlist_empty(&node->refs)) {
3056                 kfree(node);
3057                 binder_stats_deleted(BINDER_STAT_NODE);
3058
3059                 return refs;
3060         }
3061
3062         node->proc = NULL;
3063         node->local_strong_refs = 0;
3064         node->local_weak_refs = 0;
3065         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3066
3067         hlist_for_each_entry(ref, &node->refs, node_entry) {
3068                 refs++;
3069
3070                 if (!ref->death)
3071                         continue;
3072
3073                 death++;
3074
3075                 if (list_empty(&ref->death->work.entry)) {
3076                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3077                         list_add_tail(&ref->death->work.entry,
3078                                       &ref->proc->todo);
3079                         wake_up_interruptible(&ref->proc->wait);
3080                 } else
3081                         BUG();
3082         }
3083
3084         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3085                      "node %d now dead, refs %d, death %d\n",
3086                      node->debug_id, refs, death);
3087
3088         return refs;
3089 }
3090
3091 static void binder_deferred_release(struct binder_proc *proc)
3092 {
3093         struct binder_transaction *t;
3094         struct rb_node *n;
3095         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3096                 active_transactions, page_count;
3097
3098         BUG_ON(proc->vma);
3099         BUG_ON(proc->files);
3100
3101         hlist_del(&proc->proc_node);
3102
3103         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3104                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3105                              "%s: %d context_mgr_node gone\n",
3106                              __func__, proc->pid);
3107                 binder_context_mgr_node = NULL;
3108         }
3109
3110         threads = 0;
3111         active_transactions = 0;
3112         while ((n = rb_first(&proc->threads))) {
3113                 struct binder_thread *thread;
3114
3115                 thread = rb_entry(n, struct binder_thread, rb_node);
3116                 threads++;
3117                 active_transactions += binder_free_thread(proc, thread);
3118         }
3119
3120         nodes = 0;
3121         incoming_refs = 0;
3122         while ((n = rb_first(&proc->nodes))) {
3123                 struct binder_node *node;
3124
3125                 node = rb_entry(n, struct binder_node, rb_node);
3126                 nodes++;
3127                 rb_erase(&node->rb_node, &proc->nodes);
3128                 incoming_refs = binder_node_release(node, incoming_refs);
3129         }
3130
3131         outgoing_refs = 0;
3132         while ((n = rb_first(&proc->refs_by_desc))) {
3133                 struct binder_ref *ref;
3134
3135                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3136                 outgoing_refs++;
3137                 binder_delete_ref(ref);
3138         }
3139
3140         binder_release_work(&proc->todo);
3141         binder_release_work(&proc->delivered_death);
3142
3143         buffers = 0;
3144         while ((n = rb_first(&proc->allocated_buffers))) {
3145                 struct binder_buffer *buffer;
3146
3147                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3148
3149                 t = buffer->transaction;
3150                 if (t) {
3151                         t->buffer = NULL;
3152                         buffer->transaction = NULL;
3153                         pr_err("release proc %d, transaction %d, not freed\n",
3154                                proc->pid, t->debug_id);
3155                         /*BUG();*/
3156                 }
3157
3158                 binder_free_buf(proc, buffer);
3159                 buffers++;
3160         }
3161
3162         binder_stats_deleted(BINDER_STAT_PROC);
3163
3164         page_count = 0;
3165         if (proc->pages) {
3166                 int i;
3167
3168                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3169                         void *page_addr;
3170
3171                         if (!proc->pages[i])
3172                                 continue;
3173
3174                         page_addr = proc->buffer + i * PAGE_SIZE;
3175                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3176                                      "%s: %d: page %d at %p not freed\n",
3177                                      __func__, proc->pid, i, page_addr);
3178                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3179                         __free_page(proc->pages[i]);
3180                         page_count++;
3181                 }
3182                 kfree(proc->pages);
3183                 vfree(proc->buffer);
3184         }
3185
3186         put_task_struct(proc->tsk);
3187
3188         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3189                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3190                      __func__, proc->pid, threads, nodes, incoming_refs,
3191                      outgoing_refs, active_transactions, buffers, page_count);
3192
3193         kfree(proc);
3194 }
3195
3196 static void binder_deferred_func(struct work_struct *work)
3197 {
3198         struct binder_proc *proc;
3199         struct files_struct *files;
3200
3201         int defer;
3202
3203         do {
3204                 binder_lock(__func__);
3205                 mutex_lock(&binder_deferred_lock);
3206                 if (!hlist_empty(&binder_deferred_list)) {
3207                         proc = hlist_entry(binder_deferred_list.first,
3208                                         struct binder_proc, deferred_work_node);
3209                         hlist_del_init(&proc->deferred_work_node);
3210                         defer = proc->deferred_work;
3211                         proc->deferred_work = 0;
3212                 } else {
3213                         proc = NULL;
3214                         defer = 0;
3215                 }
3216                 mutex_unlock(&binder_deferred_lock);
3217
3218                 files = NULL;
3219                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3220                         files = proc->files;
3221                         if (files)
3222                                 proc->files = NULL;
3223                 }
3224
3225                 if (defer & BINDER_DEFERRED_FLUSH)
3226                         binder_deferred_flush(proc);
3227
3228                 if (defer & BINDER_DEFERRED_RELEASE)
3229                         binder_deferred_release(proc); /* frees proc */
3230
3231                 binder_unlock(__func__);
3232                 if (files)
3233                         put_files_struct(files);
3234         } while (proc);
3235 }
3236 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3237
3238 static void
3239 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3240 {
3241         mutex_lock(&binder_deferred_lock);
3242         proc->deferred_work |= defer;
3243         if (hlist_unhashed(&proc->deferred_work_node)) {
3244                 hlist_add_head(&proc->deferred_work_node,
3245                                 &binder_deferred_list);
3246                 schedule_work(&binder_deferred_work);
3247         }
3248         mutex_unlock(&binder_deferred_lock);
3249 }
3250
3251 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3252                                      struct binder_transaction *t)
3253 {
3254         seq_printf(m,
3255                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3256                    prefix, t->debug_id, t,
3257                    t->from ? t->from->proc->pid : 0,
3258                    t->from ? t->from->pid : 0,
3259                    t->to_proc ? t->to_proc->pid : 0,
3260                    t->to_thread ? t->to_thread->pid : 0,
3261                    t->code, t->flags, t->priority, t->need_reply);
3262         if (t->buffer == NULL) {
3263                 seq_puts(m, " buffer free\n");
3264                 return;
3265         }
3266         if (t->buffer->target_node)
3267                 seq_printf(m, " node %d",
3268                            t->buffer->target_node->debug_id);
3269         seq_printf(m, " size %zd:%zd data %p\n",
3270                    t->buffer->data_size, t->buffer->offsets_size,
3271                    t->buffer->data);
3272 }
3273
3274 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3275                                 struct binder_buffer *buffer)
3276 {
3277         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3278                    prefix, buffer->debug_id, buffer->data,
3279                    buffer->data_size, buffer->offsets_size,
3280                    buffer->transaction ? "active" : "delivered");
3281 }
3282
3283 static void print_binder_work(struct seq_file *m, const char *prefix,
3284                               const char *transaction_prefix,
3285                               struct binder_work *w)
3286 {
3287         struct binder_node *node;
3288         struct binder_transaction *t;
3289
3290         switch (w->type) {
3291         case BINDER_WORK_TRANSACTION:
3292                 t = container_of(w, struct binder_transaction, work);
3293                 print_binder_transaction(m, transaction_prefix, t);
3294                 break;
3295         case BINDER_WORK_TRANSACTION_COMPLETE:
3296                 seq_printf(m, "%stransaction complete\n", prefix);
3297                 break;
3298         case BINDER_WORK_NODE:
3299                 node = container_of(w, struct binder_node, work);
3300                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3301                            prefix, node->debug_id,
3302                            (u64)node->ptr, (u64)node->cookie);
3303                 break;
3304         case BINDER_WORK_DEAD_BINDER:
3305                 seq_printf(m, "%shas dead binder\n", prefix);
3306                 break;
3307         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3308                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3309                 break;
3310         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3311                 seq_printf(m, "%shas cleared death notification\n", prefix);
3312                 break;
3313         default:
3314                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3315                 break;
3316         }
3317 }
3318
3319 static void print_binder_thread(struct seq_file *m,
3320                                 struct binder_thread *thread,
3321                                 int print_always)
3322 {
3323         struct binder_transaction *t;
3324         struct binder_work *w;
3325         size_t start_pos = m->count;
3326         size_t header_pos;
3327
3328         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3329         header_pos = m->count;
3330         t = thread->transaction_stack;
3331         while (t) {
3332                 if (t->from == thread) {
3333                         print_binder_transaction(m,
3334                                                  "    outgoing transaction", t);
3335                         t = t->from_parent;
3336                 } else if (t->to_thread == thread) {
3337                         print_binder_transaction(m,
3338                                                  "    incoming transaction", t);
3339                         t = t->to_parent;
3340                 } else {
3341                         print_binder_transaction(m, "    bad transaction", t);
3342                         t = NULL;
3343                 }
3344         }
3345         list_for_each_entry(w, &thread->todo, entry) {
3346                 print_binder_work(m, "    ", "    pending transaction", w);
3347         }
3348         if (!print_always && m->count == header_pos)
3349                 m->count = start_pos;
3350 }
3351
3352 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3353 {
3354         struct binder_ref *ref;
3355         struct binder_work *w;
3356         int count;
3357
3358         count = 0;
3359         hlist_for_each_entry(ref, &node->refs, node_entry)
3360                 count++;
3361
3362         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3363                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3364                    node->has_strong_ref, node->has_weak_ref,
3365                    node->local_strong_refs, node->local_weak_refs,
3366                    node->internal_strong_refs, count);
3367         if (count) {
3368                 seq_puts(m, " proc");
3369                 hlist_for_each_entry(ref, &node->refs, node_entry)
3370                         seq_printf(m, " %d", ref->proc->pid);
3371         }
3372         seq_puts(m, "\n");
3373         list_for_each_entry(w, &node->async_todo, entry)
3374                 print_binder_work(m, "    ",
3375                                   "    pending async transaction", w);
3376 }
3377
3378 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3379 {
3380         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3381                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3382                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3383 }
3384
3385 static void print_binder_proc(struct seq_file *m,
3386                               struct binder_proc *proc, int print_all)
3387 {
3388         struct binder_work *w;
3389         struct rb_node *n;
3390         size_t start_pos = m->count;
3391         size_t header_pos;
3392
3393         seq_printf(m, "proc %d\n", proc->pid);
3394         header_pos = m->count;
3395
3396         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3397                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3398                                                 rb_node), print_all);
3399         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3400                 struct binder_node *node = rb_entry(n, struct binder_node,
3401                                                     rb_node);
3402                 if (print_all || node->has_async_transaction)
3403                         print_binder_node(m, node);
3404         }
3405         if (print_all) {
3406                 for (n = rb_first(&proc->refs_by_desc);
3407                      n != NULL;
3408                      n = rb_next(n))
3409                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3410                                                      rb_node_desc));
3411         }
3412         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3413                 print_binder_buffer(m, "  buffer",
3414                                     rb_entry(n, struct binder_buffer, rb_node));
3415         list_for_each_entry(w, &proc->todo, entry)
3416                 print_binder_work(m, "  ", "  pending transaction", w);
3417         list_for_each_entry(w, &proc->delivered_death, entry) {
3418                 seq_puts(m, "  has delivered dead binder\n");
3419                 break;
3420         }
3421         if (!print_all && m->count == header_pos)
3422                 m->count = start_pos;
3423 }
3424
3425 static const char * const binder_return_strings[] = {
3426         "BR_ERROR",
3427         "BR_OK",
3428         "BR_TRANSACTION",
3429         "BR_REPLY",
3430         "BR_ACQUIRE_RESULT",
3431         "BR_DEAD_REPLY",
3432         "BR_TRANSACTION_COMPLETE",
3433         "BR_INCREFS",
3434         "BR_ACQUIRE",
3435         "BR_RELEASE",
3436         "BR_DECREFS",
3437         "BR_ATTEMPT_ACQUIRE",
3438         "BR_NOOP",
3439         "BR_SPAWN_LOOPER",
3440         "BR_FINISHED",
3441         "BR_DEAD_BINDER",
3442         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3443         "BR_FAILED_REPLY"
3444 };
3445
3446 static const char * const binder_command_strings[] = {
3447         "BC_TRANSACTION",
3448         "BC_REPLY",
3449         "BC_ACQUIRE_RESULT",
3450         "BC_FREE_BUFFER",
3451         "BC_INCREFS",
3452         "BC_ACQUIRE",
3453         "BC_RELEASE",
3454         "BC_DECREFS",
3455         "BC_INCREFS_DONE",
3456         "BC_ACQUIRE_DONE",
3457         "BC_ATTEMPT_ACQUIRE",
3458         "BC_REGISTER_LOOPER",
3459         "BC_ENTER_LOOPER",
3460         "BC_EXIT_LOOPER",
3461         "BC_REQUEST_DEATH_NOTIFICATION",
3462         "BC_CLEAR_DEATH_NOTIFICATION",
3463         "BC_DEAD_BINDER_DONE"
3464 };
3465
3466 static const char * const binder_objstat_strings[] = {
3467         "proc",
3468         "thread",
3469         "node",
3470         "ref",
3471         "death",
3472         "transaction",
3473         "transaction_complete"
3474 };
3475
3476 static void print_binder_stats(struct seq_file *m, const char *prefix,
3477                                struct binder_stats *stats)
3478 {
3479         int i;
3480
3481         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3482                      ARRAY_SIZE(binder_command_strings));
3483         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3484                 if (stats->bc[i])
3485                         seq_printf(m, "%s%s: %d\n", prefix,
3486                                    binder_command_strings[i], stats->bc[i]);
3487         }
3488
3489         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3490                      ARRAY_SIZE(binder_return_strings));
3491         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3492                 if (stats->br[i])
3493                         seq_printf(m, "%s%s: %d\n", prefix,
3494                                    binder_return_strings[i], stats->br[i]);
3495         }
3496
3497         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3498                      ARRAY_SIZE(binder_objstat_strings));
3499         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3500                      ARRAY_SIZE(stats->obj_deleted));
3501         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3502                 if (stats->obj_created[i] || stats->obj_deleted[i])
3503                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3504                                 binder_objstat_strings[i],
3505                                 stats->obj_created[i] - stats->obj_deleted[i],
3506                                 stats->obj_created[i]);
3507         }
3508 }
3509
3510 static void print_binder_proc_stats(struct seq_file *m,
3511                                     struct binder_proc *proc)
3512 {
3513         struct binder_work *w;
3514         struct rb_node *n;
3515         int count, strong, weak;
3516
3517         seq_printf(m, "proc %d\n", proc->pid);
3518         count = 0;
3519         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3520                 count++;
3521         seq_printf(m, "  threads: %d\n", count);
3522         seq_printf(m, "  requested threads: %d+%d/%d\n"
3523                         "  ready threads %d\n"
3524                         "  free async space %zd\n", proc->requested_threads,
3525                         proc->requested_threads_started, proc->max_threads,
3526                         proc->ready_threads, proc->free_async_space);
3527         count = 0;
3528         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3529                 count++;
3530         seq_printf(m, "  nodes: %d\n", count);
3531         count = 0;
3532         strong = 0;
3533         weak = 0;
3534         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3535                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3536                                                   rb_node_desc);
3537                 count++;
3538                 strong += ref->strong;
3539                 weak += ref->weak;
3540         }
3541         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3542
3543         count = 0;
3544         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3545                 count++;
3546         seq_printf(m, "  buffers: %d\n", count);
3547
3548         count = 0;
3549         list_for_each_entry(w, &proc->todo, entry) {
3550                 switch (w->type) {
3551                 case BINDER_WORK_TRANSACTION:
3552                         count++;
3553                         break;
3554                 default:
3555                         break;
3556                 }
3557         }
3558         seq_printf(m, "  pending transactions: %d\n", count);
3559
3560         print_binder_stats(m, "  ", &proc->stats);
3561 }
3562
3563
3564 static int binder_state_show(struct seq_file *m, void *unused)
3565 {
3566         struct binder_proc *proc;
3567         struct binder_node *node;
3568         int do_lock = !binder_debug_no_lock;
3569
3570         if (do_lock)
3571                 binder_lock(__func__);
3572
3573         seq_puts(m, "binder state:\n");
3574
3575         if (!hlist_empty(&binder_dead_nodes))
3576                 seq_puts(m, "dead nodes:\n");
3577         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3578                 print_binder_node(m, node);
3579
3580         hlist_for_each_entry(proc, &binder_procs, proc_node)
3581                 print_binder_proc(m, proc, 1);
3582         if (do_lock)
3583                 binder_unlock(__func__);
3584         return 0;
3585 }
3586
3587 static int binder_stats_show(struct seq_file *m, void *unused)
3588 {
3589         struct binder_proc *proc;
3590         int do_lock = !binder_debug_no_lock;
3591
3592         if (do_lock)
3593                 binder_lock(__func__);
3594
3595         seq_puts(m, "binder stats:\n");
3596
3597         print_binder_stats(m, "", &binder_stats);
3598
3599         hlist_for_each_entry(proc, &binder_procs, proc_node)
3600                 print_binder_proc_stats(m, proc);
3601         if (do_lock)
3602                 binder_unlock(__func__);
3603         return 0;
3604 }
3605
3606 static int binder_transactions_show(struct seq_file *m, void *unused)
3607 {
3608         struct binder_proc *proc;
3609         int do_lock = !binder_debug_no_lock;
3610
3611         if (do_lock)
3612                 binder_lock(__func__);
3613
3614         seq_puts(m, "binder transactions:\n");
3615         hlist_for_each_entry(proc, &binder_procs, proc_node)
3616                 print_binder_proc(m, proc, 0);
3617         if (do_lock)
3618                 binder_unlock(__func__);
3619         return 0;
3620 }
3621
3622 static int binder_proc_show(struct seq_file *m, void *unused)
3623 {
3624         struct binder_proc *itr;
3625         struct binder_proc *proc = m->private;
3626         int do_lock = !binder_debug_no_lock;
3627         bool valid_proc = false;
3628
3629         if (do_lock)
3630                 binder_lock(__func__);
3631
3632         hlist_for_each_entry(itr, &binder_procs, proc_node) {
3633                 if (itr == proc) {
3634                         valid_proc = true;
3635                         break;
3636                 }
3637         }
3638         if (valid_proc) {
3639                 seq_puts(m, "binder proc state:\n");
3640                 print_binder_proc(m, proc, 1);
3641         }
3642         if (do_lock)
3643                 binder_unlock(__func__);
3644         return 0;
3645 }
3646
3647 static void print_binder_transaction_log_entry(struct seq_file *m,
3648                                         struct binder_transaction_log_entry *e)
3649 {
3650         seq_printf(m,
3651                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3652                    e->debug_id, (e->call_type == 2) ? "reply" :
3653                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3654                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3655                    e->target_handle, e->data_size, e->offsets_size);
3656 }
3657
3658 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3659 {
3660         struct binder_transaction_log *log = m->private;
3661         int i;
3662
3663         if (log->full) {
3664                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3665                         print_binder_transaction_log_entry(m, &log->entry[i]);
3666         }
3667         for (i = 0; i < log->next; i++)
3668                 print_binder_transaction_log_entry(m, &log->entry[i]);
3669         return 0;
3670 }
3671
3672 static const struct file_operations binder_fops = {
3673         .owner = THIS_MODULE,
3674         .poll = binder_poll,
3675         .unlocked_ioctl = binder_ioctl,
3676         .compat_ioctl = binder_ioctl,
3677         .mmap = binder_mmap,
3678         .open = binder_open,
3679         .flush = binder_flush,
3680         .release = binder_release,
3681 };
3682
3683 static struct miscdevice binder_miscdev = {
3684         .minor = MISC_DYNAMIC_MINOR,
3685         .name = "binder",
3686         .fops = &binder_fops
3687 };
3688
3689 BINDER_DEBUG_ENTRY(state);
3690 BINDER_DEBUG_ENTRY(stats);
3691 BINDER_DEBUG_ENTRY(transactions);
3692 BINDER_DEBUG_ENTRY(transaction_log);
3693
3694 static int __init binder_init(void)
3695 {
3696         int ret;
3697
3698         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3699         if (binder_debugfs_dir_entry_root)
3700                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3701                                                  binder_debugfs_dir_entry_root);
3702         ret = misc_register(&binder_miscdev);
3703         if (binder_debugfs_dir_entry_root) {
3704                 debugfs_create_file("state",
3705                                     S_IRUGO,
3706                                     binder_debugfs_dir_entry_root,
3707                                     NULL,
3708                                     &binder_state_fops);
3709                 debugfs_create_file("stats",
3710                                     S_IRUGO,
3711                                     binder_debugfs_dir_entry_root,
3712                                     NULL,
3713                                     &binder_stats_fops);
3714                 debugfs_create_file("transactions",
3715                                     S_IRUGO,
3716                                     binder_debugfs_dir_entry_root,
3717                                     NULL,
3718                                     &binder_transactions_fops);
3719                 debugfs_create_file("transaction_log",
3720                                     S_IRUGO,
3721                                     binder_debugfs_dir_entry_root,
3722                                     &binder_transaction_log,
3723                                     &binder_transaction_log_fops);
3724                 debugfs_create_file("failed_transaction_log",
3725                                     S_IRUGO,
3726                                     binder_debugfs_dir_entry_root,
3727                                     &binder_transaction_log_failed,
3728                                     &binder_transaction_log_fops);
3729         }
3730         return ret;
3731 }
3732
3733 device_initcall(binder_init);
3734
3735 #define CREATE_TRACE_POINTS
3736 #include "binder_trace.h"
3737
3738 MODULE_LICENSE("GPL v2");