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