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/rtmutex.h>
  30 #include <linux/mutex.h>
  31 #include <linux/nsproxy.h>
  32 #include <linux/poll.h>
  33 #include <linux/debugfs.h>
  34 #include <linux/rbtree.h>
  35 #include <linux/sched.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/slab.h>
  40 #include <linux/pid_namespace.h>
  41 #include <linux/security.h>
  42
  43 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  44 #define BINDER_IPC_32BIT 1
  45 #endif
  46
  47 #include <uapi/linux/android/binder.h>
  48 #include "binder_trace.h"
  49
  50 static DEFINE_RT_MUTEX(binder_main_lock);
  51 static DEFINE_MUTEX(binder_deferred_lock);
  52 static DEFINE_MUTEX(binder_mmap_lock);
  53
  54 static HLIST_HEAD(binder_procs);
  55 static HLIST_HEAD(binder_deferred_list);
  56 static HLIST_HEAD(binder_dead_nodes);
  57
  58 static struct dentry *binder_debugfs_dir_entry_root;
  59 static struct dentry *binder_debugfs_dir_entry_proc;
  60 static struct binder_node *binder_context_mgr_node;
  61 static kuid_t binder_context_mgr_uid = INVALID_UID;
  62 static int binder_last_id;
  63 static struct workqueue_struct *binder_deferred_workqueue;
  64
  65 #define BINDER_DEBUG_ENTRY(name) \
  66 static int binder_##name##_open(struct inode *inode, struct file *file) \
  67 { \
  68         return single_open(file, binder_##name##_show, inode->i_private); \
  69 } \
  70 \
  71 static const struct file_operations binder_##name##_fops = { \
  72         .owner = THIS_MODULE, \
  73         .open = binder_##name##_open, \
  74         .read = seq_read, \
  75         .llseek = seq_lseek, \
  76         .release = single_release, \
  77 }
  78
  79 static int binder_proc_show(struct seq_file *m, void *unused);
  80 BINDER_DEBUG_ENTRY(proc);
  81
  82 /* This is only defined in include/asm-arm/sizes.h */
  83 #ifndef SZ_1K
  84 #define SZ_1K                               0x400
  85 #endif
  86
  87 #ifndef SZ_4M
  88 #define SZ_4M                               0x400000
  89 #endif
  90
  91 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  92
  93 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  94
  95 enum {
  96         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  97         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  98         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  99         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
 100         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
 101         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 102         BINDER_DEBUG_READ_WRITE             = 1U << 6,
 103         BINDER_DEBUG_USER_REFS              = 1U << 7,
 104         BINDER_DEBUG_THREADS                = 1U << 8,
 105         BINDER_DEBUG_TRANSACTION            = 1U << 9,
 106         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 107         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 108         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 109         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 110         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 111         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 112 };
 113 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 114         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 115 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 116
 117 static bool binder_debug_no_lock;
 118 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 119
 120 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 121 static int binder_stop_on_user_error;
 122
 123 static int binder_set_stop_on_user_error(const char *val,
 124                                          struct kernel_param *kp)
 125 {
 126         int ret;
 127
 128         ret = param_set_int(val, kp);
 129         if (binder_stop_on_user_error < 2)
 130                 wake_up(&binder_user_error_wait);
 131         return ret;
 132 }
 133 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 134         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 135
 136 #define binder_debug(mask, x...) \
 137         do { \
 138                 if (binder_debug_mask & mask) \
 139                         pr_info(x); \
 140         } while (0)
 141
 142 #define binder_user_error(x...) \
 143         do { \
 144                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 145                         pr_info(x); \
 146                 if (binder_stop_on_user_error) \
 147                         binder_stop_on_user_error = 2; \
 148         } while (0)
 149
 150 enum binder_stat_types {
 151         BINDER_STAT_PROC,
 152         BINDER_STAT_THREAD,
 153         BINDER_STAT_NODE,
 154         BINDER_STAT_REF,
 155         BINDER_STAT_DEATH,
 156         BINDER_STAT_TRANSACTION,
 157         BINDER_STAT_TRANSACTION_COMPLETE,
 158         BINDER_STAT_COUNT
 159 };
 160
 161 struct binder_stats {
 162         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 163         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 164         int obj_created[BINDER_STAT_COUNT];
 165         int obj_deleted[BINDER_STAT_COUNT];
 166 };
 167
 168 static struct binder_stats binder_stats;
 169
 170 static inline void binder_stats_deleted(enum binder_stat_types type)
 171 {
 172         binder_stats.obj_deleted[type]++;
 173 }
 174
 175 static inline void binder_stats_created(enum binder_stat_types type)
 176 {
 177         binder_stats.obj_created[type]++;
 178 }
 179
 180 struct binder_transaction_log_entry {
 181         int debug_id;
 182         int call_type;
 183         int from_proc;
 184         int from_thread;
 185         int target_handle;
 186         int to_proc;
 187         int to_thread;
 188         int to_node;
 189         int data_size;
 190         int offsets_size;
 191 };
 192 struct binder_transaction_log {
 193         int next;
 194         int full;
 195         struct binder_transaction_log_entry entry[32];
 196 };
 197 static struct binder_transaction_log binder_transaction_log;
 198 static struct binder_transaction_log binder_transaction_log_failed;
 199
 200 static struct binder_transaction_log_entry *binder_transaction_log_add(
 201         struct binder_transaction_log *log)
 202 {
 203         struct binder_transaction_log_entry *e;
 204
 205         e = &log->entry[log->next];
 206         memset(e, 0, sizeof(*e));
 207         log->next++;
 208         if (log->next == ARRAY_SIZE(log->entry)) {
 209                 log->next = 0;
 210                 log->full = 1;
 211         }
 212         return e;
 213 }
 214
 215 struct binder_work {
 216         struct list_head entry;
 217         enum {
 218                 BINDER_WORK_TRANSACTION = 1,
 219                 BINDER_WORK_TRANSACTION_COMPLETE,
 220                 BINDER_WORK_NODE,
 221                 BINDER_WORK_DEAD_BINDER,
 222                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 223                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 224         } type;
 225 };
 226
 227 struct binder_node {
 228         int debug_id;
 229         struct binder_work work;
 230         union {
 231                 struct rb_node rb_node;
 232                 struct hlist_node dead_node;
 233         };
 234         struct binder_proc *proc;
 235         struct hlist_head refs;
 236         int internal_strong_refs;
 237         int local_weak_refs;
 238         int local_strong_refs;
 239         binder_uintptr_t ptr;
 240         binder_uintptr_t cookie;
 241         unsigned has_strong_ref:1;
 242         unsigned pending_strong_ref:1;
 243         unsigned has_weak_ref:1;
 244         unsigned pending_weak_ref:1;
 245         unsigned has_async_transaction:1;
 246         unsigned accept_fds:1;
 247         unsigned min_priority:8;
 248         struct list_head async_todo;
 249 };
 250
 251 struct binder_ref_death {
 252         struct binder_work work;
 253         binder_uintptr_t cookie;
 254 };
 255
 256 struct binder_ref {
 257         /* Lookups needed: */
 258         /*   node + proc => ref (transaction) */
 259         /*   desc + proc => ref (transaction, inc/dec ref) */
 260         /*   node => refs + procs (proc exit) */
 261         int debug_id;
 262         struct rb_node rb_node_desc;
 263         struct rb_node rb_node_node;
 264         struct hlist_node node_entry;
 265         struct binder_proc *proc;
 266         struct binder_node *node;
 267         uint32_t desc;
 268         int strong;
 269         int weak;
 270         struct binder_ref_death *death;
 271 };
 272
 273 struct binder_buffer {
 274         struct list_head entry; /* free and allocated entries by address */
 275         struct rb_node rb_node; /* free entry by size or allocated entry */
 276                                 /* by address */
 277         unsigned free:1;
 278         unsigned allow_user_free:1;
 279         unsigned async_transaction:1;
 280         unsigned debug_id:29;
 281
 282         struct binder_transaction *transaction;
 283
 284         struct binder_node *target_node;
 285         size_t data_size;
 286         size_t offsets_size;
 287         uint8_t data[0];
 288 };
 289
 290 enum binder_deferred_state {
 291         BINDER_DEFERRED_PUT_FILES    = 0x01,
 292         BINDER_DEFERRED_FLUSH        = 0x02,
 293         BINDER_DEFERRED_RELEASE      = 0x04,
 294 };
 295
 296 struct binder_proc {
 297         struct hlist_node proc_node;
 298         struct rb_root threads;
 299         struct rb_root nodes;
 300         struct rb_root refs_by_desc;
 301         struct rb_root refs_by_node;
 302         int pid;
 303         struct vm_area_struct *vma;
 304         struct mm_struct *vma_vm_mm;
 305         struct task_struct *tsk;
 306         struct files_struct *files;
 307         struct hlist_node deferred_work_node;
 308         int deferred_work;
 309         void *buffer;
 310         ptrdiff_t user_buffer_offset;
 311
 312         struct list_head buffers;
 313         struct rb_root free_buffers;
 314         struct rb_root allocated_buffers;
 315         size_t free_async_space;
 316
 317         struct page **pages;
 318         size_t buffer_size;
 319         uint32_t buffer_free;
 320         struct list_head todo;
 321         wait_queue_head_t wait;
 322         struct binder_stats stats;
 323         struct list_head delivered_death;
 324         int max_threads;
 325         int requested_threads;
 326         int requested_threads_started;
 327         int ready_threads;
 328         long default_priority;
 329         struct dentry *debugfs_entry;
 330 };
 331
 332 enum {
 333         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 334         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 335         BINDER_LOOPER_STATE_EXITED      = 0x04,
 336         BINDER_LOOPER_STATE_INVALID     = 0x08,
 337         BINDER_LOOPER_STATE_WAITING     = 0x10,
 338         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 339 };
 340
 341 struct binder_thread {
 342         struct binder_proc *proc;
 343         struct rb_node rb_node;
 344         int pid;
 345         int looper;
 346         struct binder_transaction *transaction_stack;
 347         struct list_head todo;
 348         uint32_t return_error; /* Write failed, return error code in read buf */
 349         uint32_t return_error2; /* Write failed, return error code in read */
 350                 /* buffer. Used when sending a reply to a dead process that */
 351                 /* we are also waiting on */
 352         wait_queue_head_t wait;
 353         struct binder_stats stats;
 354 };
 355
 356 struct binder_transaction {
 357         int debug_id;
 358         struct binder_work work;
 359         struct binder_thread *from;
 360         struct binder_transaction *from_parent;
 361         struct binder_proc *to_proc;
 362         struct binder_thread *to_thread;
 363         struct binder_transaction *to_parent;
 364         unsigned need_reply:1;
 365         /* unsigned is_dead:1; */       /* not used at the moment */
 366
 367         struct binder_buffer *buffer;
 368         unsigned int    code;
 369         unsigned int    flags;
 370         long    priority;
 371         long    saved_priority;
 372         kuid_t  sender_euid;
 373 };
 374
 375 static void
 376 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 377
 378 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 379 {
 380         struct files_struct *files = proc->files;
 381         unsigned long rlim_cur;
 382         unsigned long irqs;
 383
 384         if (files == NULL)
 385                 return -ESRCH;
 386
 387         if (!lock_task_sighand(proc->tsk, &irqs))
 388                 return -EMFILE;
 389
 390         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 391         unlock_task_sighand(proc->tsk, &irqs);
 392
 393         return __alloc_fd(files, 0, rlim_cur, flags);
 394 }
 395
 396 /*
 397  * copied from fd_install
 398  */
 399 static void task_fd_install(
 400         struct binder_proc *proc, unsigned int fd, struct file *file)
 401 {
 402         if (proc->files)
 403                 __fd_install(proc->files, fd, file);
 404 }
 405
 406 /*
 407  * copied from sys_close
 408  */
 409 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 410 {
 411         int retval;
 412
 413         if (proc->files == NULL)
 414                 return -ESRCH;
 415
 416         retval = __close_fd(proc->files, fd);
 417         /* can't restart close syscall because file table entry was cleared */
 418         if (unlikely(retval == -ERESTARTSYS ||
 419                      retval == -ERESTARTNOINTR ||
 420                      retval == -ERESTARTNOHAND ||
 421                      retval == -ERESTART_RESTARTBLOCK))
 422                 retval = -EINTR;
 423
 424         return retval;
 425 }
 426
 427 static inline void binder_lock(const char *tag)
 428 {
 429         trace_binder_lock(tag);
 430         rt_mutex_lock(&binder_main_lock);
 431         trace_binder_locked(tag);
 432 }
 433
 434 static inline void binder_unlock(const char *tag)
 435 {
 436         trace_binder_unlock(tag);
 437         rt_mutex_unlock(&binder_main_lock);
 438 }
 439
 440 static void binder_set_nice(long nice)
 441 {
 442         long min_nice;
 443
 444         if (can_nice(current, nice)) {
 445                 set_user_nice(current, nice);
 446                 return;
 447         }
 448         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 449         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 450                      "%d: nice value %ld not allowed use %ld instead\n",
 451                       current->pid, nice, min_nice);
 452         set_user_nice(current, min_nice);
 453         if (min_nice < 20)
 454                 return;
 455         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 456 }
 457
 458 static size_t binder_buffer_size(struct binder_proc *proc,
 459                                  struct binder_buffer *buffer)
 460 {
 461         if (list_is_last(&buffer->entry, &proc->buffers))
 462                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 463         return (size_t)list_entry(buffer->entry.next,
 464                           struct binder_buffer, entry) - (size_t)buffer->data;
 465 }
 466
 467 static void binder_insert_free_buffer(struct binder_proc *proc,
 468                                       struct binder_buffer *new_buffer)
 469 {
 470         struct rb_node **p = &proc->free_buffers.rb_node;
 471         struct rb_node *parent = NULL;
 472         struct binder_buffer *buffer;
 473         size_t buffer_size;
 474         size_t new_buffer_size;
 475
 476         BUG_ON(!new_buffer->free);
 477
 478         new_buffer_size = binder_buffer_size(proc, new_buffer);
 479
 480         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 481                      "%d: add free buffer, size %zd, at %p\n",
 482                       proc->pid, new_buffer_size, new_buffer);
 483
 484         while (*p) {
 485                 parent = *p;
 486                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 487                 BUG_ON(!buffer->free);
 488
 489                 buffer_size = binder_buffer_size(proc, buffer);
 490
 491                 if (new_buffer_size < buffer_size)
 492                         p = &parent->rb_left;
 493                 else
 494                         p = &parent->rb_right;
 495         }
 496         rb_link_node(&new_buffer->rb_node, parent, p);
 497         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 498 }
 499
 500 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 501                                            struct binder_buffer *new_buffer)
 502 {
 503         struct rb_node **p = &proc->allocated_buffers.rb_node;
 504         struct rb_node *parent = NULL;
 505         struct binder_buffer *buffer;
 506
 507         BUG_ON(new_buffer->free);
 508
 509         while (*p) {
 510                 parent = *p;
 511                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 512                 BUG_ON(buffer->free);
 513
 514                 if (new_buffer < buffer)
 515                         p = &parent->rb_left;
 516                 else if (new_buffer > buffer)
 517                         p = &parent->rb_right;
 518                 else
 519                         BUG();
 520         }
 521         rb_link_node(&new_buffer->rb_node, parent, p);
 522         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 523 }
 524
 525 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 526                                                   uintptr_t user_ptr)
 527 {
 528         struct rb_node *n = proc->allocated_buffers.rb_node;
 529         struct binder_buffer *buffer;
 530         struct binder_buffer *kern_ptr;
 531
 532         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 533                 - offsetof(struct binder_buffer, data));
 534
 535         while (n) {
 536                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 537                 BUG_ON(buffer->free);
 538
 539                 if (kern_ptr < buffer)
 540                         n = n->rb_left;
 541                 else if (kern_ptr > buffer)
 542                         n = n->rb_right;
 543                 else
 544                         return buffer;
 545         }
 546         return NULL;
 547 }
 548
 549 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 550                                     void *start, void *end,
 551                                     struct vm_area_struct *vma)
 552 {
 553         void *page_addr;
 554         unsigned long user_page_addr;
 555         struct vm_struct tmp_area;
 556         struct page **page;
 557         struct mm_struct *mm;
 558
 559         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 560                      "%d: %s pages %p-%p\n", proc->pid,
 561                      allocate ? "allocate" : "free", start, end);
 562
 563         if (end <= start)
 564                 return 0;
 565
 566         trace_binder_update_page_range(proc, allocate, start, end);
 567
 568         if (vma)
 569                 mm = NULL;
 570         else
 571                 mm = get_task_mm(proc->tsk);
 572
 573         if (mm) {
 574                 down_write(&mm->mmap_sem);
 575                 vma = proc->vma;
 576                 if (vma && mm != proc->vma_vm_mm) {
 577                         pr_err("%d: vma mm and task mm mismatch\n",
 578                                 proc->pid);
 579                         vma = NULL;
 580                 }
 581         }
 582
 583         if (allocate == 0)
 584                 goto free_range;
 585
 586         if (vma == NULL) {
 587                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 588                         proc->pid);
 589                 goto err_no_vma;
 590         }
 591
 592         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 593                 int ret;
 594                 struct page **page_array_ptr;
 595
 596                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 597
 598                 BUG_ON(*page);
 599                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 600                 if (*page == NULL) {
 601                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 602                                 proc->pid, page_addr);
 603                         goto err_alloc_page_failed;
 604                 }
 605                 tmp_area.addr = page_addr;
 606                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 607                 page_array_ptr = page;
 608                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 609                 if (ret) {
 610                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 611                                proc->pid, page_addr);
 612                         goto err_map_kernel_failed;
 613                 }
 614                 user_page_addr =
 615                         (uintptr_t)page_addr + proc->user_buffer_offset;
 616                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 617                 if (ret) {
 618                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 619                                proc->pid, user_page_addr);
 620                         goto err_vm_insert_page_failed;
 621                 }
 622                 /* vm_insert_page does not seem to increment the refcount */
 623         }
 624         if (mm) {
 625                 up_write(&mm->mmap_sem);
 626                 mmput(mm);
 627         }
 628         return 0;
 629
 630 free_range:
 631         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 632              page_addr -= PAGE_SIZE) {
 633                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 634                 if (vma)
 635                         zap_page_range(vma, (uintptr_t)page_addr +
 636                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 637 err_vm_insert_page_failed:
 638                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 639 err_map_kernel_failed:
 640                 __free_page(*page);
 641                 *page = NULL;
 642 err_alloc_page_failed:
 643                 ;
 644         }
 645 err_no_vma:
 646         if (mm) {
 647                 up_write(&mm->mmap_sem);
 648                 mmput(mm);
 649         }
 650         return -ENOMEM;
 651 }
 652
 653 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 654                                               size_t data_size,
 655                                               size_t offsets_size, int is_async)
 656 {
 657         struct rb_node *n = proc->free_buffers.rb_node;
 658         struct binder_buffer *buffer;
 659         size_t buffer_size;
 660         struct rb_node *best_fit = NULL;
 661         void *has_page_addr;
 662         void *end_page_addr;
 663         size_t size;
 664
 665         if (proc->vma == NULL) {
 666                 pr_err("%d: binder_alloc_buf, no vma\n",
 667                        proc->pid);
 668                 return NULL;
 669         }
 670
 671         size = ALIGN(data_size, sizeof(void *)) +
 672                 ALIGN(offsets_size, sizeof(void *));
 673
 674         if (size < data_size || size < offsets_size) {
 675                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 676                                 proc->pid, data_size, offsets_size);
 677                 return NULL;
 678         }
 679
 680         if (is_async &&
 681             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 682                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 683                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 684                               proc->pid, size);
 685                 return NULL;
 686         }
 687
 688         while (n) {
 689                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 690                 BUG_ON(!buffer->free);
 691                 buffer_size = binder_buffer_size(proc, buffer);
 692
 693                 if (size < buffer_size) {
 694                         best_fit = n;
 695                         n = n->rb_left;
 696                 } else if (size > buffer_size)
 697                         n = n->rb_right;
 698                 else {
 699                         best_fit = n;
 700                         break;
 701                 }
 702         }
 703         if (best_fit == NULL) {
 704                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 705                         proc->pid, size);
 706                 return NULL;
 707         }
 708         if (n == NULL) {
 709                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 710                 buffer_size = binder_buffer_size(proc, buffer);
 711         }
 712
 713         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 714                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 715                       proc->pid, size, buffer, buffer_size);
 716
 717         has_page_addr =
 718                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 719         if (n == NULL) {
 720                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 721                         buffer_size = size; /* no room for other buffers */
 722                 else
 723                         buffer_size = size + sizeof(struct binder_buffer);
 724         }
 725         end_page_addr =
 726                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 727         if (end_page_addr > has_page_addr)
 728                 end_page_addr = has_page_addr;
 729         if (binder_update_page_range(proc, 1,
 730             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 731                 return NULL;
 732
 733         rb_erase(best_fit, &proc->free_buffers);
 734         buffer->free = 0;
 735         binder_insert_allocated_buffer(proc, buffer);
 736         if (buffer_size != size) {
 737                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 738
 739                 list_add(&new_buffer->entry, &buffer->entry);
 740                 new_buffer->free = 1;
 741                 binder_insert_free_buffer(proc, new_buffer);
 742         }
 743         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 744                      "%d: binder_alloc_buf size %zd got %p\n",
 745                       proc->pid, size, buffer);
 746         buffer->data_size = data_size;
 747         buffer->offsets_size = offsets_size;
 748         buffer->async_transaction = is_async;
 749         if (is_async) {
 750                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 751                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 752                              "%d: binder_alloc_buf size %zd async free %zd\n",
 753                               proc->pid, size, proc->free_async_space);
 754         }
 755
 756         return buffer;
 757 }
 758
 759 static void *buffer_start_page(struct binder_buffer *buffer)
 760 {
 761         return (void *)((uintptr_t)buffer & PAGE_MASK);
 762 }
 763
 764 static void *buffer_end_page(struct binder_buffer *buffer)
 765 {
 766         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 767 }
 768
 769 static void binder_delete_free_buffer(struct binder_proc *proc,
 770                                       struct binder_buffer *buffer)
 771 {
 772         struct binder_buffer *prev, *next = NULL;
 773         int free_page_end = 1;
 774         int free_page_start = 1;
 775
 776         BUG_ON(proc->buffers.next == &buffer->entry);
 777         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 778         BUG_ON(!prev->free);
 779         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 780                 free_page_start = 0;
 781                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 782                         free_page_end = 0;
 783                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 784                              "%d: merge free, buffer %p share page with %p\n",
 785                               proc->pid, buffer, prev);
 786         }
 787
 788         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 789                 next = list_entry(buffer->entry.next,
 790                                   struct binder_buffer, entry);
 791                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 792                         free_page_end = 0;
 793                         if (buffer_start_page(next) ==
 794                             buffer_start_page(buffer))
 795                                 free_page_start = 0;
 796                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 797                                      "%d: merge free, buffer %p share page with %p\n",
 798                                       proc->pid, buffer, prev);
 799                 }
 800         }
 801         list_del(&buffer->entry);
 802         if (free_page_start || free_page_end) {
 803                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 804                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 805                              proc->pid, buffer, free_page_start ? "" : " end",
 806                              free_page_end ? "" : " start", prev, next);
 807                 binder_update_page_range(proc, 0, free_page_start ?
 808                         buffer_start_page(buffer) : buffer_end_page(buffer),
 809                         (free_page_end ? buffer_end_page(buffer) :
 810                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 811         }
 812 }
 813
 814 static void binder_free_buf(struct binder_proc *proc,
 815                             struct binder_buffer *buffer)
 816 {
 817         size_t size, buffer_size;
 818
 819         buffer_size = binder_buffer_size(proc, buffer);
 820
 821         size = ALIGN(buffer->data_size, sizeof(void *)) +
 822                 ALIGN(buffer->offsets_size, sizeof(void *));
 823
 824         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 825                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 826                       proc->pid, buffer, size, buffer_size);
 827
 828         BUG_ON(buffer->free);
 829         BUG_ON(size > buffer_size);
 830         BUG_ON(buffer->transaction != NULL);
 831         BUG_ON((void *)buffer < proc->buffer);
 832         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 833
 834         if (buffer->async_transaction) {
 835                 proc->free_async_space += size + sizeof(struct binder_buffer);
 836
 837                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 838                              "%d: binder_free_buf size %zd async free %zd\n",
 839                               proc->pid, size, proc->free_async_space);
 840         }
 841
 842         binder_update_page_range(proc, 0,
 843                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 844                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 845                 NULL);
 846         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 847         buffer->free = 1;
 848         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 849                 struct binder_buffer *next = list_entry(buffer->entry.next,
 850                                                 struct binder_buffer, entry);
 851
 852                 if (next->free) {
 853                         rb_erase(&next->rb_node, &proc->free_buffers);
 854                         binder_delete_free_buffer(proc, next);
 855                 }
 856         }
 857         if (proc->buffers.next != &buffer->entry) {
 858                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 859                                                 struct binder_buffer, entry);
 860
 861                 if (prev->free) {
 862                         binder_delete_free_buffer(proc, buffer);
 863                         rb_erase(&prev->rb_node, &proc->free_buffers);
 864                         buffer = prev;
 865                 }
 866         }
 867         binder_insert_free_buffer(proc, buffer);
 868 }
 869
 870 static struct binder_node *binder_get_node(struct binder_proc *proc,
 871                                            binder_uintptr_t ptr)
 872 {
 873         struct rb_node *n = proc->nodes.rb_node;
 874         struct binder_node *node;
 875
 876         while (n) {
 877                 node = rb_entry(n, struct binder_node, rb_node);
 878
 879                 if (ptr < node->ptr)
 880                         n = n->rb_left;
 881                 else if (ptr > node->ptr)
 882                         n = n->rb_right;
 883                 else
 884                         return node;
 885         }
 886         return NULL;
 887 }
 888
 889 static struct binder_node *binder_new_node(struct binder_proc *proc,
 890                                            binder_uintptr_t ptr,
 891                                            binder_uintptr_t cookie)
 892 {
 893         struct rb_node **p = &proc->nodes.rb_node;
 894         struct rb_node *parent = NULL;
 895         struct binder_node *node;
 896
 897         while (*p) {
 898                 parent = *p;
 899                 node = rb_entry(parent, struct binder_node, rb_node);
 900
 901                 if (ptr < node->ptr)
 902                         p = &(*p)->rb_left;
 903                 else if (ptr > node->ptr)
 904                         p = &(*p)->rb_right;
 905                 else
 906                         return NULL;
 907         }
 908
 909         node = kzalloc(sizeof(*node), GFP_KERNEL);
 910         if (node == NULL)
 911                 return NULL;
 912         binder_stats_created(BINDER_STAT_NODE);
 913         rb_link_node(&node->rb_node, parent, p);
 914         rb_insert_color(&node->rb_node, &proc->nodes);
 915         node->debug_id = ++binder_last_id;
 916         node->proc = proc;
 917         node->ptr = ptr;
 918         node->cookie = cookie;
 919         node->work.type = BINDER_WORK_NODE;
 920         INIT_LIST_HEAD(&node->work.entry);
 921         INIT_LIST_HEAD(&node->async_todo);
 922         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 923                      "%d:%d node %d u%016llx c%016llx created\n",
 924                      proc->pid, current->pid, node->debug_id,
 925                      (u64)node->ptr, (u64)node->cookie);
 926         return node;
 927 }
 928
 929 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 930                            struct list_head *target_list)
 931 {
 932         if (strong) {
 933                 if (internal) {
 934                         if (target_list == NULL &&
 935                             node->internal_strong_refs == 0 &&
 936                             !(node == binder_context_mgr_node &&
 937                             node->has_strong_ref)) {
 938                                 pr_err("invalid inc strong node for %d\n",
 939                                         node->debug_id);
 940                                 return -EINVAL;
 941                         }
 942                         node->internal_strong_refs++;
 943                 } else
 944                         node->local_strong_refs++;
 945                 if (!node->has_strong_ref && target_list) {
 946                         list_del_init(&node->work.entry);
 947                         list_add_tail(&node->work.entry, target_list);
 948                 }
 949         } else {
 950                 if (!internal)
 951                         node->local_weak_refs++;
 952                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 953                         if (target_list == NULL) {
 954                                 pr_err("invalid inc weak node for %d\n",
 955                                         node->debug_id);
 956                                 return -EINVAL;
 957                         }
 958                         list_add_tail(&node->work.entry, target_list);
 959                 }
 960         }
 961         return 0;
 962 }
 963
 964 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 965 {
 966         if (strong) {
 967                 if (internal)
 968                         node->internal_strong_refs--;
 969                 else
 970                         node->local_strong_refs--;
 971                 if (node->local_strong_refs || node->internal_strong_refs)
 972                         return 0;
 973         } else {
 974                 if (!internal)
 975                         node->local_weak_refs--;
 976                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 977                         return 0;
 978         }
 979         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 980                 if (list_empty(&node->work.entry)) {
 981                         list_add_tail(&node->work.entry, &node->proc->todo);
 982                         wake_up_interruptible(&node->proc->wait);
 983                 }
 984         } else {
 985                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 986                     !node->local_weak_refs) {
 987                         list_del_init(&node->work.entry);
 988                         if (node->proc) {
 989                                 rb_erase(&node->rb_node, &node->proc->nodes);
 990                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 991                                              "refless node %d deleted\n",
 992                                              node->debug_id);
 993                         } else {
 994                                 hlist_del(&node->dead_node);
 995                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 996                                              "dead node %d deleted\n",
 997                                              node->debug_id);
 998                         }
 999                         kfree(node);
1000                         binder_stats_deleted(BINDER_STAT_NODE);
1001                 }
1002         }
1003
1004         return 0;
1005 }
1006
1007
1008 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1009                                          uint32_t desc)
1010 {
1011         struct rb_node *n = proc->refs_by_desc.rb_node;
1012         struct binder_ref *ref;
1013
1014         while (n) {
1015                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1016
1017                 if (desc < ref->desc)
1018                         n = n->rb_left;
1019                 else if (desc > ref->desc)
1020                         n = n->rb_right;
1021                 else
1022                         return ref;
1023         }
1024         return NULL;
1025 }
1026
1027 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1028                                                   struct binder_node *node)
1029 {
1030         struct rb_node *n;
1031         struct rb_node **p = &proc->refs_by_node.rb_node;
1032         struct rb_node *parent = NULL;
1033         struct binder_ref *ref, *new_ref;
1034
1035         while (*p) {
1036                 parent = *p;
1037                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1038
1039                 if (node < ref->node)
1040                         p = &(*p)->rb_left;
1041                 else if (node > ref->node)
1042                         p = &(*p)->rb_right;
1043                 else
1044                         return ref;
1045         }
1046         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1047         if (new_ref == NULL)
1048                 return NULL;
1049         binder_stats_created(BINDER_STAT_REF);
1050         new_ref->debug_id = ++binder_last_id;
1051         new_ref->proc = proc;
1052         new_ref->node = node;
1053         rb_link_node(&new_ref->rb_node_node, parent, p);
1054         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1055
1056         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1057         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1058                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1059                 if (ref->desc > new_ref->desc)
1060                         break;
1061                 new_ref->desc = ref->desc + 1;
1062         }
1063
1064         p = &proc->refs_by_desc.rb_node;
1065         while (*p) {
1066                 parent = *p;
1067                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1068
1069                 if (new_ref->desc < ref->desc)
1070                         p = &(*p)->rb_left;
1071                 else if (new_ref->desc > ref->desc)
1072                         p = &(*p)->rb_right;
1073                 else
1074                         BUG();
1075         }
1076         rb_link_node(&new_ref->rb_node_desc, parent, p);
1077         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1078         if (node) {
1079                 hlist_add_head(&new_ref->node_entry, &node->refs);
1080
1081                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1082                              "%d new ref %d desc %d for node %d\n",
1083                               proc->pid, new_ref->debug_id, new_ref->desc,
1084                               node->debug_id);
1085         } else {
1086                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1087                              "%d new ref %d desc %d for dead node\n",
1088                               proc->pid, new_ref->debug_id, new_ref->desc);
1089         }
1090         return new_ref;
1091 }
1092
1093 static void binder_delete_ref(struct binder_ref *ref)
1094 {
1095         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1096                      "%d delete ref %d desc %d for node %d\n",
1097                       ref->proc->pid, ref->debug_id, ref->desc,
1098                       ref->node->debug_id);
1099
1100         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1101         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1102         if (ref->strong)
1103                 binder_dec_node(ref->node, 1, 1);
1104         hlist_del(&ref->node_entry);
1105         binder_dec_node(ref->node, 0, 1);
1106         if (ref->death) {
1107                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1108                              "%d delete ref %d desc %d has death notification\n",
1109                               ref->proc->pid, ref->debug_id, ref->desc);
1110                 list_del(&ref->death->work.entry);
1111                 kfree(ref->death);
1112                 binder_stats_deleted(BINDER_STAT_DEATH);
1113         }
1114         kfree(ref);
1115         binder_stats_deleted(BINDER_STAT_REF);
1116 }
1117
1118 static int binder_inc_ref(struct binder_ref *ref, int strong,
1119                           struct list_head *target_list)
1120 {
1121         int ret;
1122
1123         if (strong) {
1124                 if (ref->strong == 0) {
1125                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1126                         if (ret)
1127                                 return ret;
1128                 }
1129                 ref->strong++;
1130         } else {
1131                 if (ref->weak == 0) {
1132                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1133                         if (ret)
1134                                 return ret;
1135                 }
1136                 ref->weak++;
1137         }
1138         return 0;
1139 }
1140
1141
1142 static int binder_dec_ref(struct binder_ref *ref, int strong)
1143 {
1144         if (strong) {
1145                 if (ref->strong == 0) {
1146                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1147                                           ref->proc->pid, ref->debug_id,
1148                                           ref->desc, ref->strong, ref->weak);
1149                         return -EINVAL;
1150                 }
1151                 ref->strong--;
1152                 if (ref->strong == 0) {
1153                         int ret;
1154
1155                         ret = binder_dec_node(ref->node, strong, 1);
1156                         if (ret)
1157                                 return ret;
1158                 }
1159         } else {
1160                 if (ref->weak == 0) {
1161                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1162                                           ref->proc->pid, ref->debug_id,
1163                                           ref->desc, ref->strong, ref->weak);
1164                         return -EINVAL;
1165                 }
1166                 ref->weak--;
1167         }
1168         if (ref->strong == 0 && ref->weak == 0)
1169                 binder_delete_ref(ref);
1170         return 0;
1171 }
1172
1173 static void binder_pop_transaction(struct binder_thread *target_thread,
1174                                    struct binder_transaction *t)
1175 {
1176         if (target_thread) {
1177                 BUG_ON(target_thread->transaction_stack != t);
1178                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1179                 target_thread->transaction_stack =
1180                         target_thread->transaction_stack->from_parent;
1181                 t->from = NULL;
1182         }
1183         t->need_reply = 0;
1184         if (t->buffer)
1185                 t->buffer->transaction = NULL;
1186         kfree(t);
1187         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1188 }
1189
1190 static void binder_send_failed_reply(struct binder_transaction *t,
1191                                      uint32_t error_code)
1192 {
1193         struct binder_thread *target_thread;
1194         struct binder_transaction *next;
1195
1196         BUG_ON(t->flags & TF_ONE_WAY);
1197         while (1) {
1198                 target_thread = t->from;
1199                 if (target_thread) {
1200                         if (target_thread->return_error != BR_OK &&
1201                            target_thread->return_error2 == BR_OK) {
1202                                 target_thread->return_error2 =
1203                                         target_thread->return_error;
1204                                 target_thread->return_error = BR_OK;
1205                         }
1206                         if (target_thread->return_error == BR_OK) {
1207                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1208                                              "send failed reply for transaction %d to %d:%d\n",
1209                                               t->debug_id,
1210                                               target_thread->proc->pid,
1211                                               target_thread->pid);
1212
1213                                 binder_pop_transaction(target_thread, t);
1214                                 target_thread->return_error = error_code;
1215                                 wake_up_interruptible(&target_thread->wait);
1216                         } else {
1217                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1218                                         target_thread->proc->pid,
1219                                         target_thread->pid,
1220                                         target_thread->return_error);
1221                         }
1222                         return;
1223                 }
1224                 next = t->from_parent;
1225
1226                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1227                              "send failed reply for transaction %d, target dead\n",
1228                              t->debug_id);
1229
1230                 binder_pop_transaction(target_thread, t);
1231                 if (next == NULL) {
1232                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1233                                      "reply failed, no target thread at root\n");
1234                         return;
1235                 }
1236                 t = next;
1237                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1238                              "reply failed, no target thread -- retry %d\n",
1239                               t->debug_id);
1240         }
1241 }
1242
1243 static void binder_transaction_buffer_release(struct binder_proc *proc,
1244                                               struct binder_buffer *buffer,
1245                                               binder_size_t *failed_at)
1246 {
1247         binder_size_t *offp, *off_end;
1248         int debug_id = buffer->debug_id;
1249
1250         binder_debug(BINDER_DEBUG_TRANSACTION,
1251                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1252                      proc->pid, buffer->debug_id,
1253                      buffer->data_size, buffer->offsets_size, failed_at);
1254
1255         if (buffer->target_node)
1256                 binder_dec_node(buffer->target_node, 1, 0);
1257
1258         offp = (binder_size_t *)(buffer->data +
1259                                  ALIGN(buffer->data_size, sizeof(void *)));
1260         if (failed_at)
1261                 off_end = failed_at;
1262         else
1263                 off_end = (void *)offp + buffer->offsets_size;
1264         for (; offp < off_end; offp++) {
1265                 struct flat_binder_object *fp;
1266
1267                 if (*offp > buffer->data_size - sizeof(*fp) ||
1268                     buffer->data_size < sizeof(*fp) ||
1269                     !IS_ALIGNED(*offp, sizeof(u32))) {
1270                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1271                                debug_id, (u64)*offp, buffer->data_size);
1272                         continue;
1273                 }
1274                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1275                 switch (fp->type) {
1276                 case BINDER_TYPE_BINDER:
1277                 case BINDER_TYPE_WEAK_BINDER: {
1278                         struct binder_node *node = binder_get_node(proc, fp->binder);
1279
1280                         if (node == NULL) {
1281                                 pr_err("transaction release %d bad node %016llx\n",
1282                                        debug_id, (u64)fp->binder);
1283                                 break;
1284                         }
1285                         binder_debug(BINDER_DEBUG_TRANSACTION,
1286                                      "        node %d u%016llx\n",
1287                                      node->debug_id, (u64)node->ptr);
1288                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1289                 } break;
1290                 case BINDER_TYPE_HANDLE:
1291                 case BINDER_TYPE_WEAK_HANDLE: {
1292                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1293
1294                         if (ref == NULL) {
1295                                 pr_err("transaction release %d bad handle %d\n",
1296                                  debug_id, fp->handle);
1297                                 break;
1298                         }
1299                         binder_debug(BINDER_DEBUG_TRANSACTION,
1300                                      "        ref %d desc %d (node %d)\n",
1301                                      ref->debug_id, ref->desc, ref->node->debug_id);
1302                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1303                 } break;
1304
1305                 case BINDER_TYPE_FD:
1306                         binder_debug(BINDER_DEBUG_TRANSACTION,
1307                                      "        fd %d\n", fp->handle);
1308                         if (failed_at)
1309                                 task_close_fd(proc, fp->handle);
1310                         break;
1311
1312                 default:
1313                         pr_err("transaction release %d bad object type %x\n",
1314                                 debug_id, fp->type);
1315                         break;
1316                 }
1317         }
1318 }
1319
1320 static void binder_transaction(struct binder_proc *proc,
1321                                struct binder_thread *thread,
1322                                struct binder_transaction_data *tr, int reply)
1323 {
1324         struct binder_transaction *t;
1325         struct binder_work *tcomplete;
1326         binder_size_t *offp, *off_end;
1327         binder_size_t off_min;
1328         struct binder_proc *target_proc;
1329         struct binder_thread *target_thread = NULL;
1330         struct binder_node *target_node = NULL;
1331         struct list_head *target_list;
1332         wait_queue_head_t *target_wait;
1333         struct binder_transaction *in_reply_to = NULL;
1334         struct binder_transaction_log_entry *e;
1335         uint32_t return_error;
1336
1337         e = binder_transaction_log_add(&binder_transaction_log);
1338         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1339         e->from_proc = proc->pid;
1340         e->from_thread = thread->pid;
1341         e->target_handle = tr->target.handle;
1342         e->data_size = tr->data_size;
1343         e->offsets_size = tr->offsets_size;
1344
1345         if (reply) {
1346                 in_reply_to = thread->transaction_stack;
1347                 if (in_reply_to == NULL) {
1348                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1349                                           proc->pid, thread->pid);
1350                         return_error = BR_FAILED_REPLY;
1351                         goto err_empty_call_stack;
1352                 }
1353                 binder_set_nice(in_reply_to->saved_priority);
1354                 if (in_reply_to->to_thread != thread) {
1355                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1356                                 proc->pid, thread->pid, in_reply_to->debug_id,
1357                                 in_reply_to->to_proc ?
1358                                 in_reply_to->to_proc->pid : 0,
1359                                 in_reply_to->to_thread ?
1360                                 in_reply_to->to_thread->pid : 0);
1361                         return_error = BR_FAILED_REPLY;
1362                         in_reply_to = NULL;
1363                         goto err_bad_call_stack;
1364                 }
1365                 thread->transaction_stack = in_reply_to->to_parent;
1366                 target_thread = in_reply_to->from;
1367                 if (target_thread == NULL) {
1368                         return_error = BR_DEAD_REPLY;
1369                         goto err_dead_binder;
1370                 }
1371                 if (target_thread->transaction_stack != in_reply_to) {
1372                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1373                                 proc->pid, thread->pid,
1374                                 target_thread->transaction_stack ?
1375                                 target_thread->transaction_stack->debug_id : 0,
1376                                 in_reply_to->debug_id);
1377                         return_error = BR_FAILED_REPLY;
1378                         in_reply_to = NULL;
1379                         target_thread = NULL;
1380                         goto err_dead_binder;
1381                 }
1382                 target_proc = target_thread->proc;
1383         } else {
1384                 if (tr->target.handle) {
1385                         struct binder_ref *ref;
1386
1387                         ref = binder_get_ref(proc, tr->target.handle);
1388                         if (ref == NULL) {
1389                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1390                                         proc->pid, thread->pid);
1391                                 return_error = BR_FAILED_REPLY;
1392                                 goto err_invalid_target_handle;
1393                         }
1394                         target_node = ref->node;
1395                 } else {
1396                         target_node = binder_context_mgr_node;
1397                         if (target_node == NULL) {
1398                                 return_error = BR_DEAD_REPLY;
1399                                 goto err_no_context_mgr_node;
1400                         }
1401                 }
1402                 e->to_node = target_node->debug_id;
1403                 target_proc = target_node->proc;
1404                 if (target_proc == NULL) {
1405                         return_error = BR_DEAD_REPLY;
1406                         goto err_dead_binder;
1407                 }
1408                 if (security_binder_transaction(proc->tsk, target_proc->tsk) < 0) {
1409                         return_error = BR_FAILED_REPLY;
1410                         goto err_invalid_target_handle;
1411                 }
1412                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1413                         struct binder_transaction *tmp;
1414
1415                         tmp = thread->transaction_stack;
1416                         if (tmp->to_thread != thread) {
1417                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1418                                         proc->pid, thread->pid, tmp->debug_id,
1419                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1420                                         tmp->to_thread ?
1421                                         tmp->to_thread->pid : 0);
1422                                 return_error = BR_FAILED_REPLY;
1423                                 goto err_bad_call_stack;
1424                         }
1425                         while (tmp) {
1426                                 if (tmp->from && tmp->from->proc == target_proc)
1427                                         target_thread = tmp->from;
1428                                 tmp = tmp->from_parent;
1429                         }
1430                 }
1431         }
1432         if (target_thread) {
1433                 e->to_thread = target_thread->pid;
1434                 target_list = &target_thread->todo;
1435                 target_wait = &target_thread->wait;
1436         } else {
1437                 target_list = &target_proc->todo;
1438                 target_wait = &target_proc->wait;
1439         }
1440         e->to_proc = target_proc->pid;
1441
1442         /* TODO: reuse incoming transaction for reply */
1443         t = kzalloc(sizeof(*t), GFP_KERNEL);
1444         if (t == NULL) {
1445                 return_error = BR_FAILED_REPLY;
1446                 goto err_alloc_t_failed;
1447         }
1448         binder_stats_created(BINDER_STAT_TRANSACTION);
1449
1450         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1451         if (tcomplete == NULL) {
1452                 return_error = BR_FAILED_REPLY;
1453                 goto err_alloc_tcomplete_failed;
1454         }
1455         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1456
1457         t->debug_id = ++binder_last_id;
1458         e->debug_id = t->debug_id;
1459
1460         if (reply)
1461                 binder_debug(BINDER_DEBUG_TRANSACTION,
1462                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1463                              proc->pid, thread->pid, t->debug_id,
1464                              target_proc->pid, target_thread->pid,
1465                              (u64)tr->data.ptr.buffer,
1466                              (u64)tr->data.ptr.offsets,
1467                              (u64)tr->data_size, (u64)tr->offsets_size);
1468         else
1469                 binder_debug(BINDER_DEBUG_TRANSACTION,
1470                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1471                              proc->pid, thread->pid, t->debug_id,
1472                              target_proc->pid, target_node->debug_id,
1473                              (u64)tr->data.ptr.buffer,
1474                              (u64)tr->data.ptr.offsets,
1475                              (u64)tr->data_size, (u64)tr->offsets_size);
1476
1477         if (!reply && !(tr->flags & TF_ONE_WAY))
1478                 t->from = thread;
1479         else
1480                 t->from = NULL;
1481         t->sender_euid = task_euid(proc->tsk);
1482         t->to_proc = target_proc;
1483         t->to_thread = target_thread;
1484         t->code = tr->code;
1485         t->flags = tr->flags;
1486         t->priority = task_nice(current);
1487
1488         trace_binder_transaction(reply, t, target_node);
1489
1490         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1491                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1492         if (t->buffer == NULL) {
1493                 return_error = BR_FAILED_REPLY;
1494                 goto err_binder_alloc_buf_failed;
1495         }
1496         t->buffer->allow_user_free = 0;
1497         t->buffer->debug_id = t->debug_id;
1498         t->buffer->transaction = t;
1499         t->buffer->target_node = target_node;
1500         trace_binder_transaction_alloc_buf(t->buffer);
1501         if (target_node)
1502                 binder_inc_node(target_node, 1, 0, NULL);
1503
1504         offp = (binder_size_t *)(t->buffer->data +
1505                                  ALIGN(tr->data_size, sizeof(void *)));
1506
1507         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1508                            tr->data.ptr.buffer, tr->data_size)) {
1509                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1510                                 proc->pid, thread->pid);
1511                 return_error = BR_FAILED_REPLY;
1512                 goto err_copy_data_failed;
1513         }
1514         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1515                            tr->data.ptr.offsets, tr->offsets_size)) {
1516                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1517                                 proc->pid, thread->pid);
1518                 return_error = BR_FAILED_REPLY;
1519                 goto err_copy_data_failed;
1520         }
1521         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1522                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1523                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1524                 return_error = BR_FAILED_REPLY;
1525                 goto err_bad_offset;
1526         }
1527         off_end = (void *)offp + tr->offsets_size;
1528         off_min = 0;
1529         for (; offp < off_end; offp++) {
1530                 struct flat_binder_object *fp;
1531
1532                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1533                     *offp < off_min ||
1534                     t->buffer->data_size < sizeof(*fp) ||
1535                     !IS_ALIGNED(*offp, sizeof(u32))) {
1536                         binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
1537                                           proc->pid, thread->pid, (u64)*offp,
1538                                           (u64)off_min,
1539                                           (u64)(t->buffer->data_size -
1540                                           sizeof(*fp)));
1541                         return_error = BR_FAILED_REPLY;
1542                         goto err_bad_offset;
1543                 }
1544                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1545                 off_min = *offp + sizeof(struct flat_binder_object);
1546                 switch (fp->type) {
1547                 case BINDER_TYPE_BINDER:
1548                 case BINDER_TYPE_WEAK_BINDER: {
1549                         struct binder_ref *ref;
1550                         struct binder_node *node = binder_get_node(proc, fp->binder);
1551
1552                         if (node == NULL) {
1553                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1554                                 if (node == NULL) {
1555                                         return_error = BR_FAILED_REPLY;
1556                                         goto err_binder_new_node_failed;
1557                                 }
1558                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1559                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1560                         }
1561                         if (fp->cookie != node->cookie) {
1562                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1563                                         proc->pid, thread->pid,
1564                                         (u64)fp->binder, node->debug_id,
1565                                         (u64)fp->cookie, (u64)node->cookie);
1566                                 return_error = BR_FAILED_REPLY;
1567                                 goto err_binder_get_ref_for_node_failed;
1568                         }
1569                         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) {
1570                                 return_error = BR_FAILED_REPLY;
1571                                 goto err_binder_get_ref_for_node_failed;
1572                         }
1573                         ref = binder_get_ref_for_node(target_proc, node);
1574                         if (ref == NULL) {
1575                                 return_error = BR_FAILED_REPLY;
1576                                 goto err_binder_get_ref_for_node_failed;
1577                         }
1578                         if (fp->type == BINDER_TYPE_BINDER)
1579                                 fp->type = BINDER_TYPE_HANDLE;
1580                         else
1581                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1582                         fp->handle = ref->desc;
1583                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1584                                        &thread->todo);
1585
1586                         trace_binder_transaction_node_to_ref(t, node, ref);
1587                         binder_debug(BINDER_DEBUG_TRANSACTION,
1588                                      "        node %d u%016llx -> ref %d desc %d\n",
1589                                      node->debug_id, (u64)node->ptr,
1590                                      ref->debug_id, ref->desc);
1591                 } break;
1592                 case BINDER_TYPE_HANDLE:
1593                 case BINDER_TYPE_WEAK_HANDLE: {
1594                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1595
1596                         if (ref == NULL) {
1597                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1598                                                 proc->pid,
1599                                                 thread->pid, fp->handle);
1600                                 return_error = BR_FAILED_REPLY;
1601                                 goto err_binder_get_ref_failed;
1602                         }
1603                         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) {
1604                                 return_error = BR_FAILED_REPLY;
1605                                 goto err_binder_get_ref_failed;
1606                         }
1607                         if (ref->node->proc == target_proc) {
1608                                 if (fp->type == BINDER_TYPE_HANDLE)
1609                                         fp->type = BINDER_TYPE_BINDER;
1610                                 else
1611                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1612                                 fp->binder = ref->node->ptr;
1613                                 fp->cookie = ref->node->cookie;
1614                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1615                                 trace_binder_transaction_ref_to_node(t, ref);
1616                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1617                                              "        ref %d desc %d -> node %d u%016llx\n",
1618                                              ref->debug_id, ref->desc, ref->node->debug_id,
1619                                              (u64)ref->node->ptr);
1620                         } else {
1621                                 struct binder_ref *new_ref;
1622
1623                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1624                                 if (new_ref == NULL) {
1625                                         return_error = BR_FAILED_REPLY;
1626                                         goto err_binder_get_ref_for_node_failed;
1627                                 }
1628                                 fp->handle = new_ref->desc;
1629                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1630                                 trace_binder_transaction_ref_to_ref(t, ref,
1631                                                                     new_ref);
1632                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1633                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1634                                              ref->debug_id, ref->desc, new_ref->debug_id,
1635                                              new_ref->desc, ref->node->debug_id);
1636                         }
1637                 } break;
1638
1639                 case BINDER_TYPE_FD: {
1640                         int target_fd;
1641                         struct file *file;
1642
1643                         if (reply) {
1644                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1645                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1646                                                 proc->pid, thread->pid, fp->handle);
1647                                         return_error = BR_FAILED_REPLY;
1648                                         goto err_fd_not_allowed;
1649                                 }
1650                         } else if (!target_node->accept_fds) {
1651                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1652                                         proc->pid, thread->pid, fp->handle);
1653                                 return_error = BR_FAILED_REPLY;
1654                                 goto err_fd_not_allowed;
1655                         }
1656
1657                         file = fget(fp->handle);
1658                         if (file == NULL) {
1659                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1660                                         proc->pid, thread->pid, fp->handle);
1661                                 return_error = BR_FAILED_REPLY;
1662                                 goto err_fget_failed;
1663                         }
1664                         if (security_binder_transfer_file(proc->tsk, target_proc->tsk, file) < 0) {
1665                                 fput(file);
1666                                 return_error = BR_FAILED_REPLY;
1667                                 goto err_get_unused_fd_failed;
1668                         }
1669                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1670                         if (target_fd < 0) {
1671                                 fput(file);
1672                                 return_error = BR_FAILED_REPLY;
1673                                 goto err_get_unused_fd_failed;
1674                         }
1675                         task_fd_install(target_proc, target_fd, file);
1676                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1677                         binder_debug(BINDER_DEBUG_TRANSACTION,
1678                                      "        fd %d -> %d\n", fp->handle, target_fd);
1679                         /* TODO: fput? */
1680                         fp->handle = target_fd;
1681                 } break;
1682
1683                 default:
1684                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1685                                 proc->pid, thread->pid, fp->type);
1686                         return_error = BR_FAILED_REPLY;
1687                         goto err_bad_object_type;
1688                 }
1689         }
1690         if (reply) {
1691                 BUG_ON(t->buffer->async_transaction != 0);
1692                 binder_pop_transaction(target_thread, in_reply_to);
1693         } else if (!(t->flags & TF_ONE_WAY)) {
1694                 BUG_ON(t->buffer->async_transaction != 0);
1695                 t->need_reply = 1;
1696                 t->from_parent = thread->transaction_stack;
1697                 thread->transaction_stack = t;
1698         } else {
1699                 BUG_ON(target_node == NULL);
1700                 BUG_ON(t->buffer->async_transaction != 1);
1701                 if (target_node->has_async_transaction) {
1702                         target_list = &target_node->async_todo;
1703                         target_wait = NULL;
1704                 } else
1705                         target_node->has_async_transaction = 1;
1706         }
1707         t->work.type = BINDER_WORK_TRANSACTION;
1708         list_add_tail(&t->work.entry, target_list);
1709         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1710         list_add_tail(&tcomplete->entry, &thread->todo);
1711         if (target_wait)
1712                 wake_up_interruptible(target_wait);
1713         return;
1714
1715 err_get_unused_fd_failed:
1716 err_fget_failed:
1717 err_fd_not_allowed:
1718 err_binder_get_ref_for_node_failed:
1719 err_binder_get_ref_failed:
1720 err_binder_new_node_failed:
1721 err_bad_object_type:
1722 err_bad_offset:
1723 err_copy_data_failed:
1724         trace_binder_transaction_failed_buffer_release(t->buffer);
1725         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1726         t->buffer->transaction = NULL;
1727         binder_free_buf(target_proc, t->buffer);
1728 err_binder_alloc_buf_failed:
1729         kfree(tcomplete);
1730         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1731 err_alloc_tcomplete_failed:
1732         kfree(t);
1733         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1734 err_alloc_t_failed:
1735 err_bad_call_stack:
1736 err_empty_call_stack:
1737 err_dead_binder:
1738 err_invalid_target_handle:
1739 err_no_context_mgr_node:
1740         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1741                      "%d:%d transaction failed %d, size %lld-%lld\n",
1742                      proc->pid, thread->pid, return_error,
1743                      (u64)tr->data_size, (u64)tr->offsets_size);
1744
1745         {
1746                 struct binder_transaction_log_entry *fe;
1747
1748                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1749                 *fe = *e;
1750         }
1751
1752         BUG_ON(thread->return_error != BR_OK);
1753         if (in_reply_to) {
1754                 thread->return_error = BR_TRANSACTION_COMPLETE;
1755                 binder_send_failed_reply(in_reply_to, return_error);
1756         } else
1757                 thread->return_error = return_error;
1758 }
1759
1760 static int binder_thread_write(struct binder_proc *proc,
1761                         struct binder_thread *thread,
1762                         binder_uintptr_t binder_buffer, size_t size,
1763                         binder_size_t *consumed)
1764 {
1765         uint32_t cmd;
1766         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1767         void __user *ptr = buffer + *consumed;
1768         void __user *end = buffer + size;
1769
1770         while (ptr < end && thread->return_error == BR_OK) {
1771                 if (get_user(cmd, (uint32_t __user *)ptr))
1772                         return -EFAULT;
1773                 ptr += sizeof(uint32_t);
1774                 trace_binder_command(cmd);
1775                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1776                         binder_stats.bc[_IOC_NR(cmd)]++;
1777                         proc->stats.bc[_IOC_NR(cmd)]++;
1778                         thread->stats.bc[_IOC_NR(cmd)]++;
1779                 }
1780                 switch (cmd) {
1781                 case BC_INCREFS:
1782                 case BC_ACQUIRE:
1783                 case BC_RELEASE:
1784                 case BC_DECREFS: {
1785                         uint32_t target;
1786                         struct binder_ref *ref;
1787                         const char *debug_string;
1788
1789                         if (get_user(target, (uint32_t __user *)ptr))
1790                                 return -EFAULT;
1791                         ptr += sizeof(uint32_t);
1792                         if (target == 0 && binder_context_mgr_node &&
1793                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1794                                 ref = binder_get_ref_for_node(proc,
1795                                                binder_context_mgr_node);
1796                                 if (ref->desc != target) {
1797                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1798                                                 proc->pid, thread->pid,
1799                                                 ref->desc);
1800                                 }
1801                         } else
1802                                 ref = binder_get_ref(proc, target);
1803                         if (ref == NULL) {
1804                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1805                                         proc->pid, thread->pid, target);
1806                                 break;
1807                         }
1808                         switch (cmd) {
1809                         case BC_INCREFS:
1810                                 debug_string = "IncRefs";
1811                                 binder_inc_ref(ref, 0, NULL);
1812                                 break;
1813                         case BC_ACQUIRE:
1814                                 debug_string = "Acquire";
1815                                 binder_inc_ref(ref, 1, NULL);
1816                                 break;
1817                         case BC_RELEASE:
1818                                 debug_string = "Release";
1819                                 binder_dec_ref(ref, 1);
1820                                 break;
1821                         case BC_DECREFS:
1822                         default:
1823                                 debug_string = "DecRefs";
1824                                 binder_dec_ref(ref, 0);
1825                                 break;
1826                         }
1827                         binder_debug(BINDER_DEBUG_USER_REFS,
1828                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1829                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1830                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1831                         break;
1832                 }
1833                 case BC_INCREFS_DONE:
1834                 case BC_ACQUIRE_DONE: {
1835                         binder_uintptr_t node_ptr;
1836                         binder_uintptr_t cookie;
1837                         struct binder_node *node;
1838
1839                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1840                                 return -EFAULT;
1841                         ptr += sizeof(binder_uintptr_t);
1842                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1843                                 return -EFAULT;
1844                         ptr += sizeof(binder_uintptr_t);
1845                         node = binder_get_node(proc, node_ptr);
1846                         if (node == NULL) {
1847                                 binder_user_error("%d:%d %s u%016llx no match\n",
1848                                         proc->pid, thread->pid,
1849                                         cmd == BC_INCREFS_DONE ?
1850                                         "BC_INCREFS_DONE" :
1851                                         "BC_ACQUIRE_DONE",
1852                                         (u64)node_ptr);
1853                                 break;
1854                         }
1855                         if (cookie != node->cookie) {
1856                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1857                                         proc->pid, thread->pid,
1858                                         cmd == BC_INCREFS_DONE ?
1859                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1860                                         (u64)node_ptr, node->debug_id,
1861                                         (u64)cookie, (u64)node->cookie);
1862                                 break;
1863                         }
1864                         if (cmd == BC_ACQUIRE_DONE) {
1865                                 if (node->pending_strong_ref == 0) {
1866                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1867                                                 proc->pid, thread->pid,
1868                                                 node->debug_id);
1869                                         break;
1870                                 }
1871                                 node->pending_strong_ref = 0;
1872                         } else {
1873                                 if (node->pending_weak_ref == 0) {
1874                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1875                                                 proc->pid, thread->pid,
1876                                                 node->debug_id);
1877                                         break;
1878                                 }
1879                                 node->pending_weak_ref = 0;
1880                         }
1881                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1882                         binder_debug(BINDER_DEBUG_USER_REFS,
1883                                      "%d:%d %s node %d ls %d lw %d\n",
1884                                      proc->pid, thread->pid,
1885                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1886                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1887                         break;
1888                 }
1889                 case BC_ATTEMPT_ACQUIRE:
1890                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1891                         return -EINVAL;
1892                 case BC_ACQUIRE_RESULT:
1893                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1894                         return -EINVAL;
1895
1896                 case BC_FREE_BUFFER: {
1897                         binder_uintptr_t data_ptr;
1898                         struct binder_buffer *buffer;
1899
1900                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1901                                 return -EFAULT;
1902                         ptr += sizeof(binder_uintptr_t);
1903
1904                         buffer = binder_buffer_lookup(proc, data_ptr);
1905                         if (buffer == NULL) {
1906                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1907                                         proc->pid, thread->pid, (u64)data_ptr);
1908                                 break;
1909                         }
1910                         if (!buffer->allow_user_free) {
1911                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1912                                         proc->pid, thread->pid, (u64)data_ptr);
1913                                 break;
1914                         }
1915                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1916                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1917                                      proc->pid, thread->pid, (u64)data_ptr,
1918                                      buffer->debug_id,
1919                                      buffer->transaction ? "active" : "finished");
1920
1921                         if (buffer->transaction) {
1922                                 buffer->transaction->buffer = NULL;
1923                                 buffer->transaction = NULL;
1924                         }
1925                         if (buffer->async_transaction && buffer->target_node) {
1926                                 BUG_ON(!buffer->target_node->has_async_transaction);
1927                                 if (list_empty(&buffer->target_node->async_todo))
1928                                         buffer->target_node->has_async_transaction = 0;
1929                                 else
1930                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1931                         }
1932                         trace_binder_transaction_buffer_release(buffer);
1933                         binder_transaction_buffer_release(proc, buffer, NULL);
1934                         binder_free_buf(proc, buffer);
1935                         break;
1936                 }
1937
1938                 case BC_TRANSACTION:
1939                 case BC_REPLY: {
1940                         struct binder_transaction_data tr;
1941
1942                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1943                                 return -EFAULT;
1944                         ptr += sizeof(tr);
1945                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1946                         break;
1947                 }
1948
1949                 case BC_REGISTER_LOOPER:
1950                         binder_debug(BINDER_DEBUG_THREADS,
1951                                      "%d:%d BC_REGISTER_LOOPER\n",
1952                                      proc->pid, thread->pid);
1953                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1954                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1955                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1956                                         proc->pid, thread->pid);
1957                         } else if (proc->requested_threads == 0) {
1958                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1959                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1960                                         proc->pid, thread->pid);
1961                         } else {
1962                                 proc->requested_threads--;
1963                                 proc->requested_threads_started++;
1964                         }
1965                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1966                         break;
1967                 case BC_ENTER_LOOPER:
1968                         binder_debug(BINDER_DEBUG_THREADS,
1969                                      "%d:%d BC_ENTER_LOOPER\n",
1970                                      proc->pid, thread->pid);
1971                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1972                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1973                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1974                                         proc->pid, thread->pid);
1975                         }
1976                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1977                         break;
1978                 case BC_EXIT_LOOPER:
1979                         binder_debug(BINDER_DEBUG_THREADS,
1980                                      "%d:%d BC_EXIT_LOOPER\n",
1981                                      proc->pid, thread->pid);
1982                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1983                         break;
1984
1985                 case BC_REQUEST_DEATH_NOTIFICATION:
1986                 case BC_CLEAR_DEATH_NOTIFICATION: {
1987                         uint32_t target;
1988                         binder_uintptr_t cookie;
1989                         struct binder_ref *ref;
1990                         struct binder_ref_death *death;
1991
1992                         if (get_user(target, (uint32_t __user *)ptr))
1993                                 return -EFAULT;
1994                         ptr += sizeof(uint32_t);
1995                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1996                                 return -EFAULT;
1997                         ptr += sizeof(binder_uintptr_t);
1998                         ref = binder_get_ref(proc, target);
1999                         if (ref == NULL) {
2000                                 binder_user_error("%d:%d %s invalid ref %d\n",
2001                                         proc->pid, thread->pid,
2002                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2003                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2004                                         "BC_CLEAR_DEATH_NOTIFICATION",
2005                                         target);
2006                                 break;
2007                         }
2008
2009                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2010                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2011                                      proc->pid, thread->pid,
2012                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2013                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2014                                      "BC_CLEAR_DEATH_NOTIFICATION",
2015                                      (u64)cookie, ref->debug_id, ref->desc,
2016                                      ref->strong, ref->weak, ref->node->debug_id);
2017
2018                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2019                                 if (ref->death) {
2020                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2021                                                 proc->pid, thread->pid);
2022                                         break;
2023                                 }
2024                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2025                                 if (death == NULL) {
2026                                         thread->return_error = BR_ERROR;
2027                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2028                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2029                                                      proc->pid, thread->pid);
2030                                         break;
2031                                 }
2032                                 binder_stats_created(BINDER_STAT_DEATH);
2033                                 INIT_LIST_HEAD(&death->work.entry);
2034                                 death->cookie = cookie;
2035                                 ref->death = death;
2036                                 if (ref->node->proc == NULL) {
2037                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2038                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2039                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2040                                         } else {
2041                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2042                                                 wake_up_interruptible(&proc->wait);
2043                                         }
2044                                 }
2045                         } else {
2046                                 if (ref->death == NULL) {
2047                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2048                                                 proc->pid, thread->pid);
2049                                         break;
2050                                 }
2051                                 death = ref->death;
2052                                 if (death->cookie != cookie) {
2053                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2054                                                 proc->pid, thread->pid,
2055                                                 (u64)death->cookie,
2056                                                 (u64)cookie);
2057                                         break;
2058                                 }
2059                                 ref->death = NULL;
2060                                 if (list_empty(&death->work.entry)) {
2061                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2062                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2063                                                 list_add_tail(&death->work.entry, &thread->todo);
2064                                         } else {
2065                                                 list_add_tail(&death->work.entry, &proc->todo);
2066                                                 wake_up_interruptible(&proc->wait);
2067                                         }
2068                                 } else {
2069                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2070                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2071                                 }
2072                         }
2073                 } break;
2074                 case BC_DEAD_BINDER_DONE: {
2075                         struct binder_work *w;
2076                         binder_uintptr_t cookie;
2077                         struct binder_ref_death *death = NULL;
2078
2079                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2080                                 return -EFAULT;
2081
2082                         ptr += sizeof(void *);
2083                         list_for_each_entry(w, &proc->delivered_death, entry) {
2084                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2085
2086                                 if (tmp_death->cookie == cookie) {
2087                                         death = tmp_death;
2088                                         break;
2089                                 }
2090                         }
2091                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2092                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2093                                      proc->pid, thread->pid, (u64)cookie,
2094                                      death);
2095                         if (death == NULL) {
2096                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2097                                         proc->pid, thread->pid, (u64)cookie);
2098                                 break;
2099                         }
2100
2101                         list_del_init(&death->work.entry);
2102                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2103                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2104                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2105                                         list_add_tail(&death->work.entry, &thread->todo);
2106                                 } else {
2107                                         list_add_tail(&death->work.entry, &proc->todo);
2108                                         wake_up_interruptible(&proc->wait);
2109                                 }
2110                         }
2111                 } break;
2112
2113                 default:
2114                         pr_err("%d:%d unknown command %d\n",
2115                                proc->pid, thread->pid, cmd);
2116                         return -EINVAL;
2117                 }
2118                 *consumed = ptr - buffer;
2119         }
2120         return 0;
2121 }
2122
2123 static void binder_stat_br(struct binder_proc *proc,
2124                            struct binder_thread *thread, uint32_t cmd)
2125 {
2126         trace_binder_return(cmd);
2127         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2128                 binder_stats.br[_IOC_NR(cmd)]++;
2129                 proc->stats.br[_IOC_NR(cmd)]++;
2130                 thread->stats.br[_IOC_NR(cmd)]++;
2131         }
2132 }
2133
2134 static int binder_has_proc_work(struct binder_proc *proc,
2135                                 struct binder_thread *thread)
2136 {
2137         return !list_empty(&proc->todo) ||
2138                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2139 }
2140
2141 static int binder_has_thread_work(struct binder_thread *thread)
2142 {
2143         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2144                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2145 }
2146
2147 static int binder_thread_read(struct binder_proc *proc,
2148                               struct binder_thread *thread,
2149                               binder_uintptr_t binder_buffer, size_t size,
2150                               binder_size_t *consumed, int non_block)
2151 {
2152         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2153         void __user *ptr = buffer + *consumed;
2154         void __user *end = buffer + size;
2155
2156         int ret = 0;
2157         int wait_for_proc_work;
2158
2159         if (*consumed == 0) {
2160                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2161                         return -EFAULT;
2162                 ptr += sizeof(uint32_t);
2163         }
2164
2165 retry:
2166         wait_for_proc_work = thread->transaction_stack == NULL &&
2167                                 list_empty(&thread->todo);
2168
2169         if (thread->return_error != BR_OK && ptr < end) {
2170                 if (thread->return_error2 != BR_OK) {
2171                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2172                                 return -EFAULT;
2173                         ptr += sizeof(uint32_t);
2174                         binder_stat_br(proc, thread, thread->return_error2);
2175                         if (ptr == end)
2176                                 goto done;
2177                         thread->return_error2 = BR_OK;
2178                 }
2179                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2180                         return -EFAULT;
2181                 ptr += sizeof(uint32_t);
2182                 binder_stat_br(proc, thread, thread->return_error);
2183                 thread->return_error = BR_OK;
2184                 goto done;
2185         }
2186
2187
2188         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2189         if (wait_for_proc_work)
2190                 proc->ready_threads++;
2191
2192         binder_unlock(__func__);
2193
2194         trace_binder_wait_for_work(wait_for_proc_work,
2195                                    !!thread->transaction_stack,
2196                                    !list_empty(&thread->todo));
2197         if (wait_for_proc_work) {
2198                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2199                                         BINDER_LOOPER_STATE_ENTERED))) {
2200                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2201                                 proc->pid, thread->pid, thread->looper);
2202                         wait_event_interruptible(binder_user_error_wait,
2203                                                  binder_stop_on_user_error < 2);
2204                 }
2205                 binder_set_nice(proc->default_priority);
2206                 if (non_block) {
2207                         if (!binder_has_proc_work(proc, thread))
2208                                 ret = -EAGAIN;
2209                 } else
2210                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2211         } else {
2212                 if (non_block) {
2213                         if (!binder_has_thread_work(thread))
2214                                 ret = -EAGAIN;
2215                 } else
2216                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2217         }
2218
2219         binder_lock(__func__);
2220
2221         if (wait_for_proc_work)
2222                 proc->ready_threads--;
2223         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2224
2225         if (ret)
2226                 return ret;
2227
2228         while (1) {
2229                 uint32_t cmd;
2230                 struct binder_transaction_data tr;
2231                 struct binder_work *w;
2232                 struct binder_transaction *t = NULL;
2233
2234                 if (!list_empty(&thread->todo)) {
2235                         w = list_first_entry(&thread->todo, struct binder_work,
2236                                              entry);
2237                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2238                         w = list_first_entry(&proc->todo, struct binder_work,
2239                                              entry);
2240                 } else {
2241                         /* no data added */
2242                         if (ptr - buffer == 4 &&
2243                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2244                                 goto retry;
2245                         break;
2246                 }
2247
2248                 if (end - ptr < sizeof(tr) + 4)
2249                         break;
2250
2251                 switch (w->type) {
2252                 case BINDER_WORK_TRANSACTION: {
2253                         t = container_of(w, struct binder_transaction, work);
2254                 } break;
2255                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2256                         cmd = BR_TRANSACTION_COMPLETE;
2257                         if (put_user(cmd, (uint32_t __user *)ptr))
2258                                 return -EFAULT;
2259                         ptr += sizeof(uint32_t);
2260
2261                         binder_stat_br(proc, thread, cmd);
2262                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2263                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2264                                      proc->pid, thread->pid);
2265
2266                         list_del(&w->entry);
2267                         kfree(w);
2268                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2269                 } break;
2270                 case BINDER_WORK_NODE: {
2271                         struct binder_node *node = container_of(w, struct binder_node, work);
2272                         uint32_t cmd = BR_NOOP;
2273                         const char *cmd_name;
2274                         int strong = node->internal_strong_refs || node->local_strong_refs;
2275                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2276
2277                         if (weak && !node->has_weak_ref) {
2278                                 cmd = BR_INCREFS;
2279                                 cmd_name = "BR_INCREFS";
2280                                 node->has_weak_ref = 1;
2281                                 node->pending_weak_ref = 1;
2282                                 node->local_weak_refs++;
2283                         } else if (strong && !node->has_strong_ref) {
2284                                 cmd = BR_ACQUIRE;
2285                                 cmd_name = "BR_ACQUIRE";
2286                                 node->has_strong_ref = 1;
2287                                 node->pending_strong_ref = 1;
2288                                 node->local_strong_refs++;
2289                         } else if (!strong && node->has_strong_ref) {
2290                                 cmd = BR_RELEASE;
2291                                 cmd_name = "BR_RELEASE";
2292                                 node->has_strong_ref = 0;
2293                         } else if (!weak && node->has_weak_ref) {
2294                                 cmd = BR_DECREFS;
2295                                 cmd_name = "BR_DECREFS";
2296                                 node->has_weak_ref = 0;
2297                         }
2298                         if (cmd != BR_NOOP) {
2299                                 if (put_user(cmd, (uint32_t __user *)ptr))
2300                                         return -EFAULT;
2301                                 ptr += sizeof(uint32_t);
2302                                 if (put_user(node->ptr,
2303                                              (binder_uintptr_t __user *)ptr))
2304                                         return -EFAULT;
2305                                 ptr += sizeof(binder_uintptr_t);
2306                                 if (put_user(node->cookie,
2307                                              (binder_uintptr_t __user *)ptr))
2308                                         return -EFAULT;
2309                                 ptr += sizeof(binder_uintptr_t);
2310
2311                                 binder_stat_br(proc, thread, cmd);
2312                                 binder_debug(BINDER_DEBUG_USER_REFS,
2313                                              "%d:%d %s %d u%016llx c%016llx\n",
2314                                              proc->pid, thread->pid, cmd_name,
2315                                              node->debug_id,
2316                                              (u64)node->ptr, (u64)node->cookie);
2317                         } else {
2318                                 list_del_init(&w->entry);
2319                                 if (!weak && !strong) {
2320                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2321                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2322                                                      proc->pid, thread->pid,
2323                                                      node->debug_id,
2324                                                      (u64)node->ptr,
2325                                                      (u64)node->cookie);
2326                                         rb_erase(&node->rb_node, &proc->nodes);
2327                                         kfree(node);
2328                                         binder_stats_deleted(BINDER_STAT_NODE);
2329                                 } else {
2330                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2331                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2332                                                      proc->pid, thread->pid,
2333                                                      node->debug_id,
2334                                                      (u64)node->ptr,
2335                                                      (u64)node->cookie);
2336                                 }
2337                         }
2338                 } break;
2339                 case BINDER_WORK_DEAD_BINDER:
2340                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2341                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2342                         struct binder_ref_death *death;
2343                         uint32_t cmd;
2344
2345                         death = container_of(w, struct binder_ref_death, work);
2346                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2347                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2348                         else
2349                                 cmd = BR_DEAD_BINDER;
2350                         if (put_user(cmd, (uint32_t __user *)ptr))
2351                                 return -EFAULT;
2352                         ptr += sizeof(uint32_t);
2353                         if (put_user(death->cookie,
2354                                      (binder_uintptr_t __user *)ptr))
2355                                 return -EFAULT;
2356                         ptr += sizeof(binder_uintptr_t);
2357                         binder_stat_br(proc, thread, cmd);
2358                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2359                                      "%d:%d %s %016llx\n",
2360                                       proc->pid, thread->pid,
2361                                       cmd == BR_DEAD_BINDER ?
2362                                       "BR_DEAD_BINDER" :
2363                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2364                                       (u64)death->cookie);
2365
2366                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2367                                 list_del(&w->entry);
2368                                 kfree(death);
2369                                 binder_stats_deleted(BINDER_STAT_DEATH);
2370                         } else
2371                                 list_move(&w->entry, &proc->delivered_death);
2372                         if (cmd == BR_DEAD_BINDER)
2373                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2374                 } break;
2375                 }
2376
2377                 if (!t)
2378                         continue;
2379
2380                 BUG_ON(t->buffer == NULL);
2381                 if (t->buffer->target_node) {
2382                         struct binder_node *target_node = t->buffer->target_node;
2383
2384                         tr.target.ptr = target_node->ptr;
2385                         tr.cookie =  target_node->cookie;
2386                         t->saved_priority = task_nice(current);
2387                         if (t->priority < target_node->min_priority &&
2388                             !(t->flags & TF_ONE_WAY))
2389                                 binder_set_nice(t->priority);
2390                         else if (!(t->flags & TF_ONE_WAY) ||
2391                                  t->saved_priority > target_node->min_priority)
2392                                 binder_set_nice(target_node->min_priority);
2393                         cmd = BR_TRANSACTION;
2394                 } else {
2395                         tr.target.ptr = 0;
2396                         tr.cookie = 0;
2397                         cmd = BR_REPLY;
2398                 }
2399                 tr.code = t->code;
2400                 tr.flags = t->flags;
2401                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2402
2403                 if (t->from) {
2404                         struct task_struct *sender = t->from->proc->tsk;
2405
2406                         tr.sender_pid = task_tgid_nr_ns(sender,
2407                                                         task_active_pid_ns(current));
2408                 } else {
2409                         tr.sender_pid = 0;
2410                 }
2411
2412                 tr.data_size = t->buffer->data_size;
2413                 tr.offsets_size = t->buffer->offsets_size;
2414                 tr.data.ptr.buffer = (binder_uintptr_t)(
2415                                         (uintptr_t)t->buffer->data +
2416                                         proc->user_buffer_offset);
2417                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2418                                         ALIGN(t->buffer->data_size,
2419                                             sizeof(void *));
2420
2421                 if (put_user(cmd, (uint32_t __user *)ptr))
2422                         return -EFAULT;
2423                 ptr += sizeof(uint32_t);
2424                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2425                         return -EFAULT;
2426                 ptr += sizeof(tr);
2427
2428                 trace_binder_transaction_received(t);
2429                 binder_stat_br(proc, thread, cmd);
2430                 binder_debug(BINDER_DEBUG_TRANSACTION,
2431                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2432                              proc->pid, thread->pid,
2433                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2434                              "BR_REPLY",
2435                              t->debug_id, t->from ? t->from->proc->pid : 0,
2436                              t->from ? t->from->pid : 0, cmd,
2437                              t->buffer->data_size, t->buffer->offsets_size,
2438                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2439
2440                 list_del(&t->work.entry);
2441                 t->buffer->allow_user_free = 1;
2442                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2443                         t->to_parent = thread->transaction_stack;
2444                         t->to_thread = thread;
2445                         thread->transaction_stack = t;
2446                 } else {
2447                         t->buffer->transaction = NULL;
2448                         kfree(t);
2449                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2450                 }
2451                 break;
2452         }
2453
2454 done:
2455
2456         *consumed = ptr - buffer;
2457         if (proc->requested_threads + proc->ready_threads == 0 &&
2458             proc->requested_threads_started < proc->max_threads &&
2459             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2460              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2461              /*spawn a new thread if we leave this out */) {
2462                 proc->requested_threads++;
2463                 binder_debug(BINDER_DEBUG_THREADS,
2464                              "%d:%d BR_SPAWN_LOOPER\n",
2465                              proc->pid, thread->pid);
2466                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2467                         return -EFAULT;
2468                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2469         }
2470         return 0;
2471 }
2472
2473 static void binder_release_work(struct list_head *list)
2474 {
2475         struct binder_work *w;
2476
2477         while (!list_empty(list)) {
2478                 w = list_first_entry(list, struct binder_work, entry);
2479                 list_del_init(&w->entry);
2480                 switch (w->type) {
2481                 case BINDER_WORK_TRANSACTION: {
2482                         struct binder_transaction *t;
2483
2484                         t = container_of(w, struct binder_transaction, work);
2485                         if (t->buffer->target_node &&
2486                             !(t->flags & TF_ONE_WAY)) {
2487                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2488                         } else {
2489                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2490                                         "undelivered transaction %d\n",
2491                                         t->debug_id);
2492                                 t->buffer->transaction = NULL;
2493                                 kfree(t);
2494                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2495                         }
2496                 } break;
2497                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2498                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2499                                 "undelivered TRANSACTION_COMPLETE\n");
2500                         kfree(w);
2501                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2502                 } break;
2503                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2504                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2505                         struct binder_ref_death *death;
2506
2507                         death = container_of(w, struct binder_ref_death, work);
2508                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2509                                 "undelivered death notification, %016llx\n",
2510                                 (u64)death->cookie);
2511                         kfree(death);
2512                         binder_stats_deleted(BINDER_STAT_DEATH);
2513                 } break;
2514                 default:
2515                         pr_err("unexpected work type, %d, not freed\n",
2516                                w->type);
2517                         break;
2518                 }
2519         }
2520
2521 }
2522
2523 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2524 {
2525         struct binder_thread *thread = NULL;
2526         struct rb_node *parent = NULL;
2527         struct rb_node **p = &proc->threads.rb_node;
2528
2529         while (*p) {
2530                 parent = *p;
2531                 thread = rb_entry(parent, struct binder_thread, rb_node);
2532
2533                 if (current->pid < thread->pid)
2534                         p = &(*p)->rb_left;
2535                 else if (current->pid > thread->pid)
2536                         p = &(*p)->rb_right;
2537                 else
2538                         break;
2539         }
2540         if (*p == NULL) {
2541                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2542                 if (thread == NULL)
2543                         return NULL;
2544                 binder_stats_created(BINDER_STAT_THREAD);
2545                 thread->proc = proc;
2546                 thread->pid = current->pid;
2547                 init_waitqueue_head(&thread->wait);
2548                 INIT_LIST_HEAD(&thread->todo);
2549                 rb_link_node(&thread->rb_node, parent, p);
2550                 rb_insert_color(&thread->rb_node, &proc->threads);
2551                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2552                 thread->return_error = BR_OK;
2553                 thread->return_error2 = BR_OK;
2554         }
2555         return thread;
2556 }
2557
2558 static int binder_free_thread(struct binder_proc *proc,
2559                               struct binder_thread *thread)
2560 {
2561         struct binder_transaction *t;
2562         struct binder_transaction *send_reply = NULL;
2563         int active_transactions = 0;
2564
2565         rb_erase(&thread->rb_node, &proc->threads);
2566         t = thread->transaction_stack;
2567         if (t && t->to_thread == thread)
2568                 send_reply = t;
2569         while (t) {
2570                 active_transactions++;
2571                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2572                              "release %d:%d transaction %d %s, still active\n",
2573                               proc->pid, thread->pid,
2574                              t->debug_id,
2575                              (t->to_thread == thread) ? "in" : "out");
2576
2577                 if (t->to_thread == thread) {
2578                         t->to_proc = NULL;
2579                         t->to_thread = NULL;
2580                         if (t->buffer) {
2581                                 t->buffer->transaction = NULL;
2582                                 t->buffer = NULL;
2583                         }
2584                         t = t->to_parent;
2585                 } else if (t->from == thread) {
2586                         t->from = NULL;
2587                         t = t->from_parent;
2588                 } else
2589                         BUG();
2590         }
2591         if (send_reply)
2592                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2593         binder_release_work(&thread->todo);
2594         kfree(thread);
2595         binder_stats_deleted(BINDER_STAT_THREAD);
2596         return active_transactions;
2597 }
2598
2599 static unsigned int binder_poll(struct file *filp,
2600                                 struct poll_table_struct *wait)
2601 {
2602         struct binder_proc *proc = filp->private_data;
2603         struct binder_thread *thread = NULL;
2604         int wait_for_proc_work;
2605
2606         binder_lock(__func__);
2607
2608         thread = binder_get_thread(proc);
2609
2610         wait_for_proc_work = thread->transaction_stack == NULL &&
2611                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2612
2613         binder_unlock(__func__);
2614
2615         if (wait_for_proc_work) {
2616                 if (binder_has_proc_work(proc, thread))
2617                         return POLLIN;
2618                 poll_wait(filp, &proc->wait, wait);
2619                 if (binder_has_proc_work(proc, thread))
2620                         return POLLIN;
2621         } else {
2622                 if (binder_has_thread_work(thread))
2623                         return POLLIN;
2624                 poll_wait(filp, &thread->wait, wait);
2625                 if (binder_has_thread_work(thread))
2626                         return POLLIN;
2627         }
2628         return 0;
2629 }
2630
2631 static int binder_ioctl_write_read(struct file *filp,
2632                                 unsigned int cmd, unsigned long arg,
2633                                 struct binder_thread *thread)
2634 {
2635         int ret = 0;
2636         struct binder_proc *proc = filp->private_data;
2637         unsigned int size = _IOC_SIZE(cmd);
2638         void __user *ubuf = (void __user *)arg;
2639         struct binder_write_read bwr;
2640
2641         if (size != sizeof(struct binder_write_read)) {
2642                 ret = -EINVAL;
2643                 goto out;
2644         }
2645         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2646                 ret = -EFAULT;
2647                 goto out;
2648         }
2649         binder_debug(BINDER_DEBUG_READ_WRITE,
2650                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2651                      proc->pid, thread->pid,
2652                      (u64)bwr.write_size, (u64)bwr.write_buffer,
2653                      (u64)bwr.read_size, (u64)bwr.read_buffer);
2654
2655         if (bwr.write_size > 0) {
2656                 ret = binder_thread_write(proc, thread,
2657                                           bwr.write_buffer,
2658                                           bwr.write_size,
2659                                           &bwr.write_consumed);
2660                 trace_binder_write_done(ret);
2661                 if (ret < 0) {
2662                         bwr.read_consumed = 0;
2663                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2664                                 ret = -EFAULT;
2665                         goto out;
2666                 }
2667         }
2668         if (bwr.read_size > 0) {
2669                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2670                                          bwr.read_size,
2671                                          &bwr.read_consumed,
2672                                          filp->f_flags & O_NONBLOCK);
2673                 trace_binder_read_done(ret);
2674                 if (!list_empty(&proc->todo))
2675                         wake_up_interruptible(&proc->wait);
2676                 if (ret < 0) {
2677                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2678                                 ret = -EFAULT;
2679                         goto out;
2680                 }
2681         }
2682         binder_debug(BINDER_DEBUG_READ_WRITE,
2683                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2684                      proc->pid, thread->pid,
2685                      (u64)bwr.write_consumed, (u64)bwr.write_size,
2686                      (u64)bwr.read_consumed, (u64)bwr.read_size);
2687         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2688                 ret = -EFAULT;
2689                 goto out;
2690         }
2691 out:
2692         return ret;
2693 }
2694
2695 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2696 {
2697         int ret = 0;
2698         struct binder_proc *proc = filp->private_data;
2699         kuid_t curr_euid = current_euid();
2700
2701         if (binder_context_mgr_node != NULL) {
2702                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2703                 ret = -EBUSY;
2704                 goto out;
2705         }
2706         ret = security_binder_set_context_mgr(proc->tsk);
2707         if (ret < 0)
2708                 goto out;
2709         if (uid_valid(binder_context_mgr_uid)) {
2710                 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2711                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2712                                from_kuid(&init_user_ns, curr_euid),
2713                                from_kuid(&init_user_ns,
2714                                         binder_context_mgr_uid));
2715                         ret = -EPERM;
2716                         goto out;
2717                 }
2718         } else {
2719                 binder_context_mgr_uid = curr_euid;
2720         }
2721         binder_context_mgr_node = binder_new_node(proc, 0, 0);
2722         if (binder_context_mgr_node == NULL) {
2723                 ret = -ENOMEM;
2724                 goto out;
2725         }
2726         binder_context_mgr_node->local_weak_refs++;
2727         binder_context_mgr_node->local_strong_refs++;
2728         binder_context_mgr_node->has_strong_ref = 1;
2729         binder_context_mgr_node->has_weak_ref = 1;
2730 out:
2731         return ret;
2732 }
2733
2734 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2735 {
2736         int ret;
2737         struct binder_proc *proc = filp->private_data;
2738         struct binder_thread *thread;
2739         unsigned int size = _IOC_SIZE(cmd);
2740         void __user *ubuf = (void __user *)arg;
2741
2742         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2743                         proc->pid, current->pid, cmd, arg);*/
2744
2745         trace_binder_ioctl(cmd, arg);
2746
2747         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2748         if (ret)
2749                 goto err_unlocked;
2750
2751         binder_lock(__func__);
2752         thread = binder_get_thread(proc);
2753         if (thread == NULL) {
2754                 ret = -ENOMEM;
2755                 goto err;
2756         }
2757
2758         switch (cmd) {
2759         case BINDER_WRITE_READ:
2760                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2761                 if (ret)
2762                         goto err;
2763                 break;
2764         case BINDER_SET_MAX_THREADS:
2765                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2766                         ret = -EINVAL;
2767                         goto err;
2768                 }
2769                 break;
2770         case BINDER_SET_CONTEXT_MGR:
2771                 ret = binder_ioctl_set_ctx_mgr(filp);
2772                 if (ret)
2773                         goto err;
2774                 break;
2775         case BINDER_THREAD_EXIT:
2776                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2777                              proc->pid, thread->pid);
2778                 binder_free_thread(proc, thread);
2779                 thread = NULL;
2780                 break;
2781         case BINDER_VERSION: {
2782                 struct binder_version __user *ver = ubuf;
2783
2784                 if (size != sizeof(struct binder_version)) {
2785                         ret = -EINVAL;
2786                         goto err;
2787                 }
2788                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2789                              &ver->protocol_version)) {
2790                         ret = -EINVAL;
2791                         goto err;
2792                 }
2793                 break;
2794         }
2795         default:
2796                 ret = -EINVAL;
2797                 goto err;
2798         }
2799         ret = 0;
2800 err:
2801         if (thread)
2802                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2803         binder_unlock(__func__);
2804         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2805         if (ret && ret != -ERESTARTSYS)
2806                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2807 err_unlocked:
2808         trace_binder_ioctl_done(ret);
2809         return ret;
2810 }
2811
2812 static void binder_vma_open(struct vm_area_struct *vma)
2813 {
2814         struct binder_proc *proc = vma->vm_private_data;
2815
2816         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2817                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2818                      proc->pid, vma->vm_start, vma->vm_end,
2819                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2820                      (unsigned long)pgprot_val(vma->vm_page_prot));
2821 }
2822
2823 static void binder_vma_close(struct vm_area_struct *vma)
2824 {
2825         struct binder_proc *proc = vma->vm_private_data;
2826
2827         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2828                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2829                      proc->pid, vma->vm_start, vma->vm_end,
2830                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2831                      (unsigned long)pgprot_val(vma->vm_page_prot));
2832         proc->vma = NULL;
2833         proc->vma_vm_mm = NULL;
2834         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2835 }
2836
2837 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2838 {
2839         return VM_FAULT_SIGBUS;
2840 }
2841
2842 static struct vm_operations_struct binder_vm_ops = {
2843         .open = binder_vma_open,
2844         .close = binder_vma_close,
2845         .fault = binder_vm_fault,
2846 };
2847
2848 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2849 {
2850         int ret;
2851         struct vm_struct *area;
2852         struct binder_proc *proc = filp->private_data;
2853         const char *failure_string;
2854         struct binder_buffer *buffer;
2855
2856         if (proc->tsk != current)
2857                 return -EINVAL;
2858
2859         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2860                 vma->vm_end = vma->vm_start + SZ_4M;
2861
2862         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2863                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2864                      proc->pid, vma->vm_start, vma->vm_end,
2865                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2866                      (unsigned long)pgprot_val(vma->vm_page_prot));
2867
2868         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2869                 ret = -EPERM;
2870                 failure_string = "bad vm_flags";
2871                 goto err_bad_arg;
2872         }
2873         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2874
2875         mutex_lock(&binder_mmap_lock);
2876         if (proc->buffer) {
2877                 ret = -EBUSY;
2878                 failure_string = "already mapped";
2879                 goto err_already_mapped;
2880         }
2881
2882         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2883         if (area == NULL) {
2884                 ret = -ENOMEM;
2885                 failure_string = "get_vm_area";
2886                 goto err_get_vm_area_failed;
2887         }
2888         proc->buffer = area->addr;
2889         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2890         mutex_unlock(&binder_mmap_lock);
2891
2892 #ifdef CONFIG_CPU_CACHE_VIPT
2893         if (cache_is_vipt_aliasing()) {
2894                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2895                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2896                         vma->vm_start += PAGE_SIZE;
2897                 }
2898         }
2899 #endif
2900         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2901         if (proc->pages == NULL) {
2902                 ret = -ENOMEM;
2903                 failure_string = "alloc page array";
2904                 goto err_alloc_pages_failed;
2905         }
2906         proc->buffer_size = vma->vm_end - vma->vm_start;
2907
2908         vma->vm_ops = &binder_vm_ops;
2909         vma->vm_private_data = proc;
2910
2911         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2912                 ret = -ENOMEM;
2913                 failure_string = "alloc small buf";
2914                 goto err_alloc_small_buf_failed;
2915         }
2916         buffer = proc->buffer;
2917         INIT_LIST_HEAD(&proc->buffers);
2918         list_add(&buffer->entry, &proc->buffers);
2919         buffer->free = 1;
2920         binder_insert_free_buffer(proc, buffer);
2921         proc->free_async_space = proc->buffer_size / 2;
2922         barrier();
2923         proc->files = get_files_struct(current);
2924         proc->vma = vma;
2925         proc->vma_vm_mm = vma->vm_mm;
2926
2927         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2928                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2929         return 0;
2930
2931 err_alloc_small_buf_failed:
2932         kfree(proc->pages);
2933         proc->pages = NULL;
2934 err_alloc_pages_failed:
2935         mutex_lock(&binder_mmap_lock);
2936         vfree(proc->buffer);
2937         proc->buffer = NULL;
2938 err_get_vm_area_failed:
2939 err_already_mapped:
2940         mutex_unlock(&binder_mmap_lock);
2941 err_bad_arg:
2942         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2943                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2944         return ret;
2945 }
2946
2947 static int binder_open(struct inode *nodp, struct file *filp)
2948 {
2949         struct binder_proc *proc;
2950
2951         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2952                      current->group_leader->pid, current->pid);
2953
2954         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2955         if (proc == NULL)
2956                 return -ENOMEM;
2957         get_task_struct(current);
2958         proc->tsk = current;
2959         INIT_LIST_HEAD(&proc->todo);
2960         init_waitqueue_head(&proc->wait);
2961         proc->default_priority = task_nice(current);
2962
2963         binder_lock(__func__);
2964
2965         binder_stats_created(BINDER_STAT_PROC);
2966         hlist_add_head(&proc->proc_node, &binder_procs);
2967         proc->pid = current->group_leader->pid;
2968         INIT_LIST_HEAD(&proc->delivered_death);
2969         filp->private_data = proc;
2970
2971         binder_unlock(__func__);
2972
2973         if (binder_debugfs_dir_entry_proc) {
2974                 char strbuf[11];
2975
2976                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2977                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2978                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2979         }
2980
2981         return 0;
2982 }
2983
2984 static int binder_flush(struct file *filp, fl_owner_t id)
2985 {
2986         struct binder_proc *proc = filp->private_data;
2987
2988         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2989
2990         return 0;
2991 }
2992
2993 static void binder_deferred_flush(struct binder_proc *proc)
2994 {
2995         struct rb_node *n;
2996         int wake_count = 0;
2997
2998         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2999                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3000
3001                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3002                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3003                         wake_up_interruptible(&thread->wait);
3004                         wake_count++;
3005                 }
3006         }
3007         wake_up_interruptible_all(&proc->wait);
3008
3009         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3010                      "binder_flush: %d woke %d threads\n", proc->pid,
3011                      wake_count);
3012 }
3013
3014 static int binder_release(struct inode *nodp, struct file *filp)
3015 {
3016         struct binder_proc *proc = filp->private_data;
3017
3018         debugfs_remove(proc->debugfs_entry);
3019         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3020
3021         return 0;
3022 }
3023
3024 static int binder_node_release(struct binder_node *node, int refs)
3025 {
3026         struct binder_ref *ref;
3027         int death = 0;
3028
3029         list_del_init(&node->work.entry);
3030         binder_release_work(&node->async_todo);
3031
3032         if (hlist_empty(&node->refs)) {
3033                 kfree(node);
3034                 binder_stats_deleted(BINDER_STAT_NODE);
3035
3036                 return refs;
3037         }
3038
3039         node->proc = NULL;
3040         node->local_strong_refs = 0;
3041         node->local_weak_refs = 0;
3042         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3043
3044         hlist_for_each_entry(ref, &node->refs, node_entry) {
3045                 refs++;
3046
3047                 if (!ref->death)
3048                         continue;
3049
3050                 death++;
3051
3052                 if (list_empty(&ref->death->work.entry)) {
3053                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3054                         list_add_tail(&ref->death->work.entry,
3055                                       &ref->proc->todo);
3056                         wake_up_interruptible(&ref->proc->wait);
3057                 } else
3058                         BUG();
3059         }
3060
3061         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3062                      "node %d now dead, refs %d, death %d\n",
3063                      node->debug_id, refs, death);
3064
3065         return refs;
3066 }
3067
3068 static void binder_deferred_release(struct binder_proc *proc)
3069 {
3070         struct binder_transaction *t;
3071         struct rb_node *n;
3072         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3073                 active_transactions, page_count;
3074
3075         BUG_ON(proc->vma);
3076         BUG_ON(proc->files);
3077
3078         hlist_del(&proc->proc_node);
3079
3080         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3081                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3082                              "%s: %d context_mgr_node gone\n",
3083                              __func__, proc->pid);
3084                 binder_context_mgr_node = NULL;
3085         }
3086
3087         threads = 0;
3088         active_transactions = 0;
3089         while ((n = rb_first(&proc->threads))) {
3090                 struct binder_thread *thread;
3091
3092                 thread = rb_entry(n, struct binder_thread, rb_node);
3093                 threads++;
3094                 active_transactions += binder_free_thread(proc, thread);
3095         }
3096
3097         nodes = 0;
3098         incoming_refs = 0;
3099         while ((n = rb_first(&proc->nodes))) {
3100                 struct binder_node *node;
3101
3102                 node = rb_entry(n, struct binder_node, rb_node);
3103                 nodes++;
3104                 rb_erase(&node->rb_node, &proc->nodes);
3105                 incoming_refs = binder_node_release(node, incoming_refs);
3106         }
3107
3108         outgoing_refs = 0;
3109         while ((n = rb_first(&proc->refs_by_desc))) {
3110                 struct binder_ref *ref;
3111
3112                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3113                 outgoing_refs++;
3114                 binder_delete_ref(ref);
3115         }
3116
3117         binder_release_work(&proc->todo);
3118         binder_release_work(&proc->delivered_death);
3119
3120         buffers = 0;
3121         while ((n = rb_first(&proc->allocated_buffers))) {
3122                 struct binder_buffer *buffer;
3123
3124                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3125
3126                 t = buffer->transaction;
3127                 if (t) {
3128                         t->buffer = NULL;
3129                         buffer->transaction = NULL;
3130                         pr_err("release proc %d, transaction %d, not freed\n",
3131                                proc->pid, t->debug_id);
3132                         /*BUG();*/
3133                 }
3134
3135                 binder_free_buf(proc, buffer);
3136                 buffers++;
3137         }
3138
3139         binder_stats_deleted(BINDER_STAT_PROC);
3140
3141         page_count = 0;
3142         if (proc->pages) {
3143                 int i;
3144
3145                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3146                         void *page_addr;
3147
3148                         if (!proc->pages[i])
3149                                 continue;
3150
3151                         page_addr = proc->buffer + i * PAGE_SIZE;
3152                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3153                                      "%s: %d: page %d at %p not freed\n",
3154                                      __func__, proc->pid, i, page_addr);
3155                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3156                         __free_page(proc->pages[i]);
3157                         page_count++;
3158                 }
3159                 kfree(proc->pages);
3160                 vfree(proc->buffer);
3161         }
3162
3163         put_task_struct(proc->tsk);
3164
3165         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3166                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3167                      __func__, proc->pid, threads, nodes, incoming_refs,
3168                      outgoing_refs, active_transactions, buffers, page_count);
3169
3170         kfree(proc);
3171 }
3172
3173 static void binder_deferred_func(struct work_struct *work)
3174 {
3175         struct binder_proc *proc;
3176         struct files_struct *files;
3177
3178         int defer;
3179
3180         do {
3181                 binder_lock(__func__);
3182                 mutex_lock(&binder_deferred_lock);
3183                 if (!hlist_empty(&binder_deferred_list)) {
3184                         proc = hlist_entry(binder_deferred_list.first,
3185                                         struct binder_proc, deferred_work_node);
3186                         hlist_del_init(&proc->deferred_work_node);
3187                         defer = proc->deferred_work;
3188                         proc->deferred_work = 0;
3189                 } else {
3190                         proc = NULL;
3191                         defer = 0;
3192                 }
3193                 mutex_unlock(&binder_deferred_lock);
3194
3195                 files = NULL;
3196                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3197                         files = proc->files;
3198                         if (files)
3199                                 proc->files = NULL;
3200                 }
3201
3202                 if (defer & BINDER_DEFERRED_FLUSH)
3203                         binder_deferred_flush(proc);
3204
3205                 if (defer & BINDER_DEFERRED_RELEASE)
3206                         binder_deferred_release(proc); /* frees proc */
3207
3208                 binder_unlock(__func__);
3209                 if (files)
3210                         put_files_struct(files);
3211         } while (proc);
3212 }
3213 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3214
3215 static void
3216 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3217 {
3218         mutex_lock(&binder_deferred_lock);
3219         proc->deferred_work |= defer;
3220         if (hlist_unhashed(&proc->deferred_work_node)) {
3221                 hlist_add_head(&proc->deferred_work_node,
3222                                 &binder_deferred_list);
3223                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3224         }
3225         mutex_unlock(&binder_deferred_lock);
3226 }
3227
3228 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3229                                      struct binder_transaction *t)
3230 {
3231         seq_printf(m,
3232                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3233                    prefix, t->debug_id, t,
3234                    t->from ? t->from->proc->pid : 0,
3235                    t->from ? t->from->pid : 0,
3236                    t->to_proc ? t->to_proc->pid : 0,
3237                    t->to_thread ? t->to_thread->pid : 0,
3238                    t->code, t->flags, t->priority, t->need_reply);
3239         if (t->buffer == NULL) {
3240                 seq_puts(m, " buffer free\n");
3241                 return;
3242         }
3243         if (t->buffer->target_node)
3244                 seq_printf(m, " node %d",
3245                            t->buffer->target_node->debug_id);
3246         seq_printf(m, " size %zd:%zd data %p\n",
3247                    t->buffer->data_size, t->buffer->offsets_size,
3248                    t->buffer->data);
3249 }
3250
3251 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3252                                 struct binder_buffer *buffer)
3253 {
3254         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3255                    prefix, buffer->debug_id, buffer->data,
3256                    buffer->data_size, buffer->offsets_size,
3257                    buffer->transaction ? "active" : "delivered");
3258 }
3259
3260 static void print_binder_work(struct seq_file *m, const char *prefix,
3261                               const char *transaction_prefix,
3262                               struct binder_work *w)
3263 {
3264         struct binder_node *node;
3265         struct binder_transaction *t;
3266
3267         switch (w->type) {
3268         case BINDER_WORK_TRANSACTION:
3269                 t = container_of(w, struct binder_transaction, work);
3270                 print_binder_transaction(m, transaction_prefix, t);
3271                 break;
3272         case BINDER_WORK_TRANSACTION_COMPLETE:
3273                 seq_printf(m, "%stransaction complete\n", prefix);
3274                 break;
3275         case BINDER_WORK_NODE:
3276                 node = container_of(w, struct binder_node, work);
3277                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3278                            prefix, node->debug_id,
3279                            (u64)node->ptr, (u64)node->cookie);
3280                 break;
3281         case BINDER_WORK_DEAD_BINDER:
3282                 seq_printf(m, "%shas dead binder\n", prefix);
3283                 break;
3284         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3285                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3286                 break;
3287         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3288                 seq_printf(m, "%shas cleared death notification\n", prefix);
3289                 break;
3290         default:
3291                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3292                 break;
3293         }
3294 }
3295
3296 static void print_binder_thread(struct seq_file *m,
3297                                 struct binder_thread *thread,
3298                                 int print_always)
3299 {
3300         struct binder_transaction *t;
3301         struct binder_work *w;
3302         size_t start_pos = m->count;
3303         size_t header_pos;
3304
3305         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3306         header_pos = m->count;
3307         t = thread->transaction_stack;
3308         while (t) {
3309                 if (t->from == thread) {
3310                         print_binder_transaction(m,
3311                                                  "    outgoing transaction", t);
3312                         t = t->from_parent;
3313                 } else if (t->to_thread == thread) {
3314                         print_binder_transaction(m,
3315                                                  "    incoming transaction", t);
3316                         t = t->to_parent;
3317                 } else {
3318                         print_binder_transaction(m, "    bad transaction", t);
3319                         t = NULL;
3320                 }
3321         }
3322         list_for_each_entry(w, &thread->todo, entry) {
3323                 print_binder_work(m, "    ", "    pending transaction", w);
3324         }
3325         if (!print_always && m->count == header_pos)
3326                 m->count = start_pos;
3327 }
3328
3329 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3330 {
3331         struct binder_ref *ref;
3332         struct binder_work *w;
3333         int count;
3334
3335         count = 0;
3336         hlist_for_each_entry(ref, &node->refs, node_entry)
3337                 count++;
3338
3339         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3340                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3341                    node->has_strong_ref, node->has_weak_ref,
3342                    node->local_strong_refs, node->local_weak_refs,
3343                    node->internal_strong_refs, count);
3344         if (count) {
3345                 seq_puts(m, " proc");
3346                 hlist_for_each_entry(ref, &node->refs, node_entry)
3347                         seq_printf(m, " %d", ref->proc->pid);
3348         }
3349         seq_puts(m, "\n");
3350         list_for_each_entry(w, &node->async_todo, entry)
3351                 print_binder_work(m, "    ",
3352                                   "    pending async transaction", w);
3353 }
3354
3355 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3356 {
3357         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3358                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3359                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3360 }
3361
3362 static void print_binder_proc(struct seq_file *m,
3363                               struct binder_proc *proc, int print_all)
3364 {
3365         struct binder_work *w;
3366         struct rb_node *n;
3367         size_t start_pos = m->count;
3368         size_t header_pos;
3369
3370         seq_printf(m, "proc %d\n", proc->pid);
3371         header_pos = m->count;
3372
3373         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3374                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3375                                                 rb_node), print_all);
3376         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3377                 struct binder_node *node = rb_entry(n, struct binder_node,
3378                                                     rb_node);
3379                 if (print_all || node->has_async_transaction)
3380                         print_binder_node(m, node);
3381         }
3382         if (print_all) {
3383                 for (n = rb_first(&proc->refs_by_desc);
3384                      n != NULL;
3385                      n = rb_next(n))
3386                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3387                                                      rb_node_desc));
3388         }
3389         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3390                 print_binder_buffer(m, "  buffer",
3391                                     rb_entry(n, struct binder_buffer, rb_node));
3392         list_for_each_entry(w, &proc->todo, entry)
3393                 print_binder_work(m, "  ", "  pending transaction", w);
3394         list_for_each_entry(w, &proc->delivered_death, entry) {
3395                 seq_puts(m, "  has delivered dead binder\n");
3396                 break;
3397         }
3398         if (!print_all && m->count == header_pos)
3399                 m->count = start_pos;
3400 }
3401
3402 static const char * const binder_return_strings[] = {
3403         "BR_ERROR",
3404         "BR_OK",
3405         "BR_TRANSACTION",
3406         "BR_REPLY",
3407         "BR_ACQUIRE_RESULT",
3408         "BR_DEAD_REPLY",
3409         "BR_TRANSACTION_COMPLETE",
3410         "BR_INCREFS",
3411         "BR_ACQUIRE",
3412         "BR_RELEASE",
3413         "BR_DECREFS",
3414         "BR_ATTEMPT_ACQUIRE",
3415         "BR_NOOP",
3416         "BR_SPAWN_LOOPER",
3417         "BR_FINISHED",
3418         "BR_DEAD_BINDER",
3419         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3420         "BR_FAILED_REPLY"
3421 };
3422
3423 static const char * const binder_command_strings[] = {
3424         "BC_TRANSACTION",
3425         "BC_REPLY",
3426         "BC_ACQUIRE_RESULT",
3427         "BC_FREE_BUFFER",
3428         "BC_INCREFS",
3429         "BC_ACQUIRE",
3430         "BC_RELEASE",
3431         "BC_DECREFS",
3432         "BC_INCREFS_DONE",
3433         "BC_ACQUIRE_DONE",
3434         "BC_ATTEMPT_ACQUIRE",
3435         "BC_REGISTER_LOOPER",
3436         "BC_ENTER_LOOPER",
3437         "BC_EXIT_LOOPER",
3438         "BC_REQUEST_DEATH_NOTIFICATION",
3439         "BC_CLEAR_DEATH_NOTIFICATION",
3440         "BC_DEAD_BINDER_DONE"
3441 };
3442
3443 static const char * const binder_objstat_strings[] = {
3444         "proc",
3445         "thread",
3446         "node",
3447         "ref",
3448         "death",
3449         "transaction",
3450         "transaction_complete"
3451 };
3452
3453 static void print_binder_stats(struct seq_file *m, const char *prefix,
3454                                struct binder_stats *stats)
3455 {
3456         int i;
3457
3458         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3459                      ARRAY_SIZE(binder_command_strings));
3460         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3461                 if (stats->bc[i])
3462                         seq_printf(m, "%s%s: %d\n", prefix,
3463                                    binder_command_strings[i], stats->bc[i]);
3464         }
3465
3466         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3467                      ARRAY_SIZE(binder_return_strings));
3468         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3469                 if (stats->br[i])
3470                         seq_printf(m, "%s%s: %d\n", prefix,
3471                                    binder_return_strings[i], stats->br[i]);
3472         }
3473
3474         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3475                      ARRAY_SIZE(binder_objstat_strings));
3476         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3477                      ARRAY_SIZE(stats->obj_deleted));
3478         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3479                 if (stats->obj_created[i] || stats->obj_deleted[i])
3480                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3481                                 binder_objstat_strings[i],
3482                                 stats->obj_created[i] - stats->obj_deleted[i],
3483                                 stats->obj_created[i]);
3484         }
3485 }
3486
3487 static void print_binder_proc_stats(struct seq_file *m,
3488                                     struct binder_proc *proc)
3489 {
3490         struct binder_work *w;
3491         struct rb_node *n;
3492         int count, strong, weak;
3493
3494         seq_printf(m, "proc %d\n", proc->pid);
3495         count = 0;
3496         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3497                 count++;
3498         seq_printf(m, "  threads: %d\n", count);
3499         seq_printf(m, "  requested threads: %d+%d/%d\n"
3500                         "  ready threads %d\n"
3501                         "  free async space %zd\n", proc->requested_threads,
3502                         proc->requested_threads_started, proc->max_threads,
3503                         proc->ready_threads, proc->free_async_space);
3504         count = 0;
3505         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3506                 count++;
3507         seq_printf(m, "  nodes: %d\n", count);
3508         count = 0;
3509         strong = 0;
3510         weak = 0;
3511         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3512                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3513                                                   rb_node_desc);
3514                 count++;
3515                 strong += ref->strong;
3516                 weak += ref->weak;
3517         }
3518         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3519
3520         count = 0;
3521         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3522                 count++;
3523         seq_printf(m, "  buffers: %d\n", count);
3524
3525         count = 0;
3526         list_for_each_entry(w, &proc->todo, entry) {
3527                 switch (w->type) {
3528                 case BINDER_WORK_TRANSACTION:
3529                         count++;
3530                         break;
3531                 default:
3532                         break;
3533                 }
3534         }
3535         seq_printf(m, "  pending transactions: %d\n", count);
3536
3537         print_binder_stats(m, "  ", &proc->stats);
3538 }
3539
3540
3541 static int binder_state_show(struct seq_file *m, void *unused)
3542 {
3543         struct binder_proc *proc;
3544         struct binder_node *node;
3545         int do_lock = !binder_debug_no_lock;
3546
3547         if (do_lock)
3548                 binder_lock(__func__);
3549
3550         seq_puts(m, "binder state:\n");
3551
3552         if (!hlist_empty(&binder_dead_nodes))
3553                 seq_puts(m, "dead nodes:\n");
3554         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3555                 print_binder_node(m, node);
3556
3557         hlist_for_each_entry(proc, &binder_procs, proc_node)
3558                 print_binder_proc(m, proc, 1);
3559         if (do_lock)
3560                 binder_unlock(__func__);
3561         return 0;
3562 }
3563
3564 static int binder_stats_show(struct seq_file *m, void *unused)
3565 {
3566         struct binder_proc *proc;
3567         int do_lock = !binder_debug_no_lock;
3568
3569         if (do_lock)
3570                 binder_lock(__func__);
3571
3572         seq_puts(m, "binder stats:\n");
3573
3574         print_binder_stats(m, "", &binder_stats);
3575
3576         hlist_for_each_entry(proc, &binder_procs, proc_node)
3577                 print_binder_proc_stats(m, proc);
3578         if (do_lock)
3579                 binder_unlock(__func__);
3580         return 0;
3581 }
3582
3583 static int binder_transactions_show(struct seq_file *m, void *unused)
3584 {
3585         struct binder_proc *proc;
3586         int do_lock = !binder_debug_no_lock;
3587
3588         if (do_lock)
3589                 binder_lock(__func__);
3590
3591         seq_puts(m, "binder transactions:\n");
3592         hlist_for_each_entry(proc, &binder_procs, proc_node)
3593                 print_binder_proc(m, proc, 0);
3594         if (do_lock)
3595                 binder_unlock(__func__);
3596         return 0;
3597 }
3598
3599 static int binder_proc_show(struct seq_file *m, void *unused)
3600 {
3601         struct binder_proc *proc = m->private;
3602         int do_lock = !binder_debug_no_lock;
3603
3604         if (do_lock)
3605                 binder_lock(__func__);
3606         seq_puts(m, "binder proc state:\n");
3607         print_binder_proc(m, proc, 1);
3608         if (do_lock)
3609                 binder_unlock(__func__);
3610         return 0;
3611 }
3612
3613 static void print_binder_transaction_log_entry(struct seq_file *m,
3614                                         struct binder_transaction_log_entry *e)
3615 {
3616         seq_printf(m,
3617                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3618                    e->debug_id, (e->call_type == 2) ? "reply" :
3619                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3620                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3621                    e->target_handle, e->data_size, e->offsets_size);
3622 }
3623
3624 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3625 {
3626         struct binder_transaction_log *log = m->private;
3627         int i;
3628
3629         if (log->full) {
3630                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3631                         print_binder_transaction_log_entry(m, &log->entry[i]);
3632         }
3633         for (i = 0; i < log->next; i++)
3634                 print_binder_transaction_log_entry(m, &log->entry[i]);
3635         return 0;
3636 }
3637
3638 static const struct file_operations binder_fops = {
3639         .owner = THIS_MODULE,
3640         .poll = binder_poll,
3641         .unlocked_ioctl = binder_ioctl,
3642         .compat_ioctl = binder_ioctl,
3643         .mmap = binder_mmap,
3644         .open = binder_open,
3645         .flush = binder_flush,
3646         .release = binder_release,
3647 };
3648
3649 static struct miscdevice binder_miscdev = {
3650         .minor = MISC_DYNAMIC_MINOR,
3651         .name = "binder",
3652         .fops = &binder_fops
3653 };
3654
3655 BINDER_DEBUG_ENTRY(state);
3656 BINDER_DEBUG_ENTRY(stats);
3657 BINDER_DEBUG_ENTRY(transactions);
3658 BINDER_DEBUG_ENTRY(transaction_log);
3659
3660 static int __init binder_init(void)
3661 {
3662         int ret;
3663
3664         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3665         if (!binder_deferred_workqueue)
3666                 return -ENOMEM;
3667
3668         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3669         if (binder_debugfs_dir_entry_root)
3670                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3671                                                  binder_debugfs_dir_entry_root);
3672         ret = misc_register(&binder_miscdev);
3673         if (binder_debugfs_dir_entry_root) {
3674                 debugfs_create_file("state",
3675                                     S_IRUGO,
3676                                     binder_debugfs_dir_entry_root,
3677                                     NULL,
3678                                     &binder_state_fops);
3679                 debugfs_create_file("stats",
3680                                     S_IRUGO,
3681                                     binder_debugfs_dir_entry_root,
3682                                     NULL,
3683                                     &binder_stats_fops);
3684                 debugfs_create_file("transactions",
3685                                     S_IRUGO,
3686                                     binder_debugfs_dir_entry_root,
3687                                     NULL,
3688                                     &binder_transactions_fops);
3689                 debugfs_create_file("transaction_log",
3690                                     S_IRUGO,
3691                                     binder_debugfs_dir_entry_root,
3692                                     &binder_transaction_log,
3693                                     &binder_transaction_log_fops);
3694                 debugfs_create_file("failed_transaction_log",
3695                                     S_IRUGO,
3696                                     binder_debugfs_dir_entry_root,
3697                                     &binder_transaction_log_failed,
3698                                     &binder_transaction_log_fops);
3699         }
3700         return ret;
3701 }
3702
3703 device_initcall(binder_init);
3704
3705 #define CREATE_TRACE_POINTS
3706 #include "binder_trace.h"
3707
3708 MODULE_LICENSE("GPL v2");