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