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