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   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 #include <asm/cacheflush.h>
  19 #include <linux/fdtable.h>
  20 #include <linux/file.h>
  21 #include <linux/fs.h>
  22 #include <linux/list.h>
  23 #include <linux/miscdevice.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/mutex.h>
  27 #include <linux/nsproxy.h>
  28 #include <linux/poll.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/rbtree.h>
  31 #include <linux/sched.h>
  32 #include <linux/uaccess.h>
  33 #include <linux/vmalloc.h>
  34 #include "binder.h"
  35
  36 static DEFINE_MUTEX(binder_lock);
  37 static HLIST_HEAD(binder_procs);
  38 static struct binder_node *binder_context_mgr_node;
  39 static uid_t binder_context_mgr_uid = -1;
  40 static int binder_last_id;
  41 static struct proc_dir_entry *binder_proc_dir_entry_root;
  42 static struct proc_dir_entry *binder_proc_dir_entry_proc;
  43 static struct hlist_head binder_dead_nodes;
  44
  45 static int binder_read_proc_proc(
  46         char *page, char **start, off_t off, int count, int *eof, void *data);
  47
  48 /* This is only defined in include/asm-arm/sizes.h */
  49 #ifndef SZ_1K
  50 #define SZ_1K                               0x400
  51 #endif
  52
  53 #ifndef SZ_4M
  54 #define SZ_4M                               0x400000
  55 #endif
  56
  57 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  58
  59 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  60
  61 enum {
  62         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  63         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  64         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  65         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  66         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  67         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
  68         BINDER_DEBUG_READ_WRITE             = 1U << 6,
  69         BINDER_DEBUG_USER_REFS              = 1U << 7,
  70         BINDER_DEBUG_THREADS                = 1U << 8,
  71         BINDER_DEBUG_TRANSACTION            = 1U << 9,
  72         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
  73         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
  74         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
  75         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
  76         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
  77         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
  78 };
  79 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
  80         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
  81 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
  82 static int binder_debug_no_lock;
  83 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
  84 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
  85 static int binder_stop_on_user_error;
  86 static int binder_set_stop_on_user_error(
  87         const char *val, struct kernel_param *kp)
  88 {
  89         int ret;
  90         ret = param_set_int(val, kp);
  91         if (binder_stop_on_user_error < 2)
  92                 wake_up(&binder_user_error_wait);
  93         return ret;
  94 }
  95 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
  96         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
  97
  98 #define binder_user_error(x...) \
  99         do { \
 100                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 101                         printk(KERN_INFO x); \
 102                 if (binder_stop_on_user_error) \
 103                         binder_stop_on_user_error = 2; \
 104         } while (0)
 105
 106 enum {
 107         BINDER_STAT_PROC,
 108         BINDER_STAT_THREAD,
 109         BINDER_STAT_NODE,
 110         BINDER_STAT_REF,
 111         BINDER_STAT_DEATH,
 112         BINDER_STAT_TRANSACTION,
 113         BINDER_STAT_TRANSACTION_COMPLETE,
 114         BINDER_STAT_COUNT
 115 };
 116
 117 struct binder_stats {
 118         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 119         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 120         int obj_created[BINDER_STAT_COUNT];
 121         int obj_deleted[BINDER_STAT_COUNT];
 122 };
 123
 124 static struct binder_stats binder_stats;
 125
 126 struct binder_transaction_log_entry {
 127         int debug_id;
 128         int call_type;
 129         int from_proc;
 130         int from_thread;
 131         int target_handle;
 132         int to_proc;
 133         int to_thread;
 134         int to_node;
 135         int data_size;
 136         int offsets_size;
 137 };
 138 struct binder_transaction_log {
 139         int next;
 140         int full;
 141         struct binder_transaction_log_entry entry[32];
 142 };
 143 struct binder_transaction_log binder_transaction_log;
 144 struct binder_transaction_log binder_transaction_log_failed;
 145
 146 static struct binder_transaction_log_entry *binder_transaction_log_add(
 147         struct binder_transaction_log *log)
 148 {
 149         struct binder_transaction_log_entry *e;
 150         e = &log->entry[log->next];
 151         memset(e, 0, sizeof(*e));
 152         log->next++;
 153         if (log->next == ARRAY_SIZE(log->entry)) {
 154                 log->next = 0;
 155                 log->full = 1;
 156         }
 157         return e;
 158 }
 159
 160 struct binder_work {
 161         struct list_head entry;
 162         enum {
 163                 BINDER_WORK_TRANSACTION = 1,
 164                 BINDER_WORK_TRANSACTION_COMPLETE,
 165                 BINDER_WORK_NODE,
 166                 BINDER_WORK_DEAD_BINDER,
 167                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 168                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 169         } type;
 170 };
 171
 172 struct binder_node {
 173         int debug_id;
 174         struct binder_work work;
 175         union {
 176                 struct rb_node rb_node;
 177                 struct hlist_node dead_node;
 178         };
 179         struct binder_proc *proc;
 180         struct hlist_head refs;
 181         int internal_strong_refs;
 182         int local_weak_refs;
 183         int local_strong_refs;
 184         void __user *ptr;
 185         void __user *cookie;
 186         unsigned has_strong_ref : 1;
 187         unsigned pending_strong_ref : 1;
 188         unsigned has_weak_ref : 1;
 189         unsigned pending_weak_ref : 1;
 190         unsigned has_async_transaction : 1;
 191         unsigned accept_fds : 1;
 192         int min_priority : 8;
 193         struct list_head async_todo;
 194 };
 195
 196 struct binder_ref_death {
 197         struct binder_work work;
 198         void __user *cookie;
 199 };
 200
 201 struct binder_ref {
 202         /* Lookups needed: */
 203         /*   node + proc => ref (transaction) */
 204         /*   desc + proc => ref (transaction, inc/dec ref) */
 205         /*   node => refs + procs (proc exit) */
 206         int debug_id;
 207         struct rb_node rb_node_desc;
 208         struct rb_node rb_node_node;
 209         struct hlist_node node_entry;
 210         struct binder_proc *proc;
 211         struct binder_node *node;
 212         uint32_t desc;
 213         int strong;
 214         int weak;
 215         struct binder_ref_death *death;
 216 };
 217
 218 struct binder_buffer {
 219         struct list_head entry; /* free and allocated entries by addesss */
 220         struct rb_node rb_node; /* free entry by size or allocated entry */
 221                                 /* by address */
 222         unsigned free : 1;
 223         unsigned allow_user_free : 1;
 224         unsigned async_transaction : 1;
 225         unsigned debug_id : 29;
 226
 227         struct binder_transaction *transaction;
 228
 229         struct binder_node *target_node;
 230         size_t data_size;
 231         size_t offsets_size;
 232         uint8_t data[0];
 233 };
 234
 235 struct binder_proc {
 236         struct hlist_node proc_node;
 237         struct rb_root threads;
 238         struct rb_root nodes;
 239         struct rb_root refs_by_desc;
 240         struct rb_root refs_by_node;
 241         int pid;
 242         struct vm_area_struct *vma;
 243         struct task_struct *tsk;
 244         void *buffer;
 245         size_t user_buffer_offset;
 246
 247         struct list_head buffers;
 248         struct rb_root free_buffers;
 249         struct rb_root allocated_buffers;
 250         size_t free_async_space;
 251
 252         struct page **pages;
 253         size_t buffer_size;
 254         uint32_t buffer_free;
 255         struct list_head todo;
 256         wait_queue_head_t wait;
 257         struct binder_stats stats;
 258         struct list_head delivered_death;
 259         int max_threads;
 260         int requested_threads;
 261         int requested_threads_started;
 262         int ready_threads;
 263         long default_priority;
 264 };
 265
 266 enum {
 267         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 268         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 269         BINDER_LOOPER_STATE_EXITED      = 0x04,
 270         BINDER_LOOPER_STATE_INVALID     = 0x08,
 271         BINDER_LOOPER_STATE_WAITING     = 0x10,
 272         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 273 };
 274
 275 struct binder_thread {
 276         struct binder_proc *proc;
 277         struct rb_node rb_node;
 278         int pid;
 279         int looper;
 280         struct binder_transaction *transaction_stack;
 281         struct list_head todo;
 282         uint32_t return_error; /* Write failed, return error code in read buf */
 283         uint32_t return_error2; /* Write failed, return error code in read */
 284                 /* buffer. Used when sending a reply to a dead process that */
 285                 /* we are also waiting on */
 286         wait_queue_head_t wait;
 287         struct binder_stats stats;
 288 };
 289
 290 struct binder_transaction {
 291         int debug_id;
 292         struct binder_work work;
 293         struct binder_thread *from;
 294         struct binder_transaction *from_parent;
 295         struct binder_proc *to_proc;
 296         struct binder_thread *to_thread;
 297         struct binder_transaction *to_parent;
 298         unsigned need_reply : 1;
 299         /*unsigned is_dead : 1;*/ /* not used at the moment */
 300
 301         struct binder_buffer *buffer;
 302         unsigned int    code;
 303         unsigned int    flags;
 304         long    priority;
 305         long    saved_priority;
 306         uid_t   sender_euid;
 307 };
 308
 309 /*
 310  * copied from get_unused_fd_flags
 311  */
 312 int task_get_unused_fd_flags(struct task_struct *tsk, int flags)
 313 {
 314         struct files_struct *files = get_files_struct(tsk);
 315         int fd, error;
 316         struct fdtable *fdt;
 317         unsigned long rlim_cur;
 318         unsigned long irqs;
 319
 320         if (files == NULL)
 321                 return -ESRCH;
 322
 323         error = -EMFILE;
 324         spin_lock(&files->file_lock);
 325
 326 repeat:
 327         fdt = files_fdtable(files);
 328         fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
 329                                 files->next_fd);
 330
 331         /*
 332          * N.B. For clone tasks sharing a files structure, this test
 333          * will limit the total number of files that can be opened.
 334          */
 335         rlim_cur = 0;
 336         if (lock_task_sighand(tsk, &irqs)) {
 337                 rlim_cur = tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
 338                 unlock_task_sighand(tsk, &irqs);
 339         }
 340         if (fd >= rlim_cur)
 341                 goto out;
 342
 343         /* Do we need to expand the fd array or fd set?  */
 344         error = expand_files(files, fd);
 345         if (error < 0)
 346                 goto out;
 347
 348         if (error) {
 349                 /*
 350                  * If we needed to expand the fs array we
 351                  * might have blocked - try again.
 352                  */
 353                 error = -EMFILE;
 354                 goto repeat;
 355         }
 356
 357         FD_SET(fd, fdt->open_fds);
 358         if (flags & O_CLOEXEC)
 359                 FD_SET(fd, fdt->close_on_exec);
 360         else
 361                 FD_CLR(fd, fdt->close_on_exec);
 362         files->next_fd = fd + 1;
 363 #if 1
 364         /* Sanity check */
 365         if (fdt->fd[fd] != NULL) {
 366                 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
 367                 fdt->fd[fd] = NULL;
 368         }
 369 #endif
 370         error = fd;
 371
 372 out:
 373         spin_unlock(&files->file_lock);
 374         put_files_struct(files);
 375         return error;
 376 }
 377
 378 /*
 379  * copied from fd_install
 380  */
 381 static void task_fd_install(
 382         struct task_struct *tsk, unsigned int fd, struct file *file)
 383 {
 384         struct files_struct *files = get_files_struct(tsk);
 385         struct fdtable *fdt;
 386
 387         if (files == NULL)
 388                 return;
 389
 390         spin_lock(&files->file_lock);
 391         fdt = files_fdtable(files);
 392         BUG_ON(fdt->fd[fd] != NULL);
 393         rcu_assign_pointer(fdt->fd[fd], file);
 394         spin_unlock(&files->file_lock);
 395         put_files_struct(files);
 396 }
 397
 398 /*
 399  * copied from __put_unused_fd in open.c
 400  */
 401 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 402 {
 403         struct fdtable *fdt = files_fdtable(files);
 404         __FD_CLR(fd, fdt->open_fds);
 405         if (fd < files->next_fd)
 406                 files->next_fd = fd;
 407 }
 408
 409 /*
 410  * copied from sys_close
 411  */
 412 static long task_close_fd(struct task_struct *tsk, unsigned int fd)
 413 {
 414         struct file *filp;
 415         struct files_struct *files = get_files_struct(tsk);
 416         struct fdtable *fdt;
 417         int retval;
 418
 419         if (files == NULL)
 420                 return -ESRCH;
 421
 422         spin_lock(&files->file_lock);
 423         fdt = files_fdtable(files);
 424         if (fd >= fdt->max_fds)
 425                 goto out_unlock;
 426         filp = fdt->fd[fd];
 427         if (!filp)
 428                 goto out_unlock;
 429         rcu_assign_pointer(fdt->fd[fd], NULL);
 430         FD_CLR(fd, fdt->close_on_exec);
 431         __put_unused_fd(files, fd);
 432         spin_unlock(&files->file_lock);
 433         retval = filp_close(filp, files);
 434
 435         /* can't restart close syscall because file table entry was cleared */
 436         if (unlikely(retval == -ERESTARTSYS ||
 437                      retval == -ERESTARTNOINTR ||
 438                      retval == -ERESTARTNOHAND ||
 439                      retval == -ERESTART_RESTARTBLOCK))
 440                 retval = -EINTR;
 441
 442         put_files_struct(files);
 443         return retval;
 444
 445 out_unlock:
 446         spin_unlock(&files->file_lock);
 447         put_files_struct(files);
 448         return -EBADF;
 449 }
 450
 451 static void binder_set_nice(long nice)
 452 {
 453         long min_nice;
 454         if (can_nice(current, nice)) {
 455                 set_user_nice(current, nice);
 456                 return;
 457         }
 458         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 459         if (binder_debug_mask & BINDER_DEBUG_PRIORITY_CAP)
 460                 printk(KERN_INFO "binder: %d: nice value %ld not allowed use "
 461                        "%ld instead\n", current->pid, nice, min_nice);
 462         set_user_nice(current, min_nice);
 463         if (min_nice < 20)
 464                 return;
 465         binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
 466 }
 467
 468 static size_t binder_buffer_size(
 469         struct binder_proc *proc, struct binder_buffer *buffer)
 470 {
 471         if (list_is_last(&buffer->entry, &proc->buffers))
 472                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 473         else
 474                 return (size_t)list_entry(buffer->entry.next,
 475                         struct binder_buffer, entry) - (size_t)buffer->data;
 476 }
 477
 478 static void binder_insert_free_buffer(
 479         struct binder_proc *proc, struct binder_buffer *new_buffer)
 480 {
 481         struct rb_node **p = &proc->free_buffers.rb_node;
 482         struct rb_node *parent = NULL;
 483         struct binder_buffer *buffer;
 484         size_t buffer_size;
 485         size_t new_buffer_size;
 486
 487         BUG_ON(!new_buffer->free);
 488
 489         new_buffer_size = binder_buffer_size(proc, new_buffer);
 490
 491         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 492                 printk(KERN_INFO "binder: %d: add free buffer, size %zd, "
 493                        "at %p\n", proc->pid, new_buffer_size, new_buffer);
 494
 495         while (*p) {
 496                 parent = *p;
 497                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 498                 BUG_ON(!buffer->free);
 499
 500                 buffer_size = binder_buffer_size(proc, buffer);
 501
 502                 if (new_buffer_size < buffer_size)
 503                         p = &parent->rb_left;
 504                 else
 505                         p = &parent->rb_right;
 506         }
 507         rb_link_node(&new_buffer->rb_node, parent, p);
 508         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 509 }
 510
 511 static void binder_insert_allocated_buffer(
 512         struct binder_proc *proc, struct binder_buffer *new_buffer)
 513 {
 514         struct rb_node **p = &proc->allocated_buffers.rb_node;
 515         struct rb_node *parent = NULL;
 516         struct binder_buffer *buffer;
 517
 518         BUG_ON(new_buffer->free);
 519
 520         while (*p) {
 521                 parent = *p;
 522                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 523                 BUG_ON(buffer->free);
 524
 525                 if (new_buffer < buffer)
 526                         p = &parent->rb_left;
 527                 else if (new_buffer > buffer)
 528                         p = &parent->rb_right;
 529                 else
 530                         BUG();
 531         }
 532         rb_link_node(&new_buffer->rb_node, parent, p);
 533         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 534 }
 535
 536 static struct binder_buffer *binder_buffer_lookup(
 537         struct binder_proc *proc, void __user *user_ptr)
 538 {
 539         struct rb_node *n = proc->allocated_buffers.rb_node;
 540         struct binder_buffer *buffer;
 541         struct binder_buffer *kern_ptr;
 542
 543         kern_ptr = user_ptr - proc->user_buffer_offset
 544                 - offsetof(struct binder_buffer, data);
 545
 546         while (n) {
 547                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 548                 BUG_ON(buffer->free);
 549
 550                 if (kern_ptr < buffer)
 551                         n = n->rb_left;
 552                 else if (kern_ptr > buffer)
 553                         n = n->rb_right;
 554                 else
 555                         return buffer;
 556         }
 557         return NULL;
 558 }
 559
 560 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 561         void *start, void *end, struct vm_area_struct *vma)
 562 {
 563         void *page_addr;
 564         unsigned long user_page_addr;
 565         struct vm_struct tmp_area;
 566         struct page **page;
 567         struct mm_struct *mm;
 568
 569         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 570                 printk(KERN_INFO "binder: %d: %s pages %p-%p\n",
 571                        proc->pid, allocate ? "allocate" : "free", start, end);
 572
 573         if (end <= start)
 574                 return 0;
 575
 576         if (vma)
 577                 mm = NULL;
 578         else
 579                 mm = get_task_mm(proc->tsk);
 580
 581         if (mm) {
 582                 down_write(&mm->mmap_sem);
 583                 vma = proc->vma;
 584         }
 585
 586         if (allocate == 0)
 587                 goto free_range;
 588
 589         if (vma == NULL) {
 590                 printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
 591                        "map pages in userspace, no vma\n", proc->pid);
 592                 goto err_no_vma;
 593         }
 594
 595         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 596                 int ret;
 597                 struct page **page_array_ptr;
 598                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 599
 600                 BUG_ON(*page);
 601                 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 602                 if (*page == NULL) {
 603                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 604                                "for page at %p\n", proc->pid, page_addr);
 605                         goto err_alloc_page_failed;
 606                 }
 607                 tmp_area.addr = page_addr;
 608                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 609                 page_array_ptr = page;
 610                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 611                 if (ret) {
 612                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 613                                "to map page at %p in kernel\n",
 614                                proc->pid, page_addr);
 615                         goto err_map_kernel_failed;
 616                 }
 617                 user_page_addr = (size_t)page_addr + proc->user_buffer_offset;
 618                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 619                 if (ret) {
 620                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 621                                "to map page at %lx in userspace\n",
 622                                proc->pid, user_page_addr);
 623                         goto err_vm_insert_page_failed;
 624                 }
 625                 /* vm_insert_page does not seem to increment the refcount */
 626         }
 627         if (mm) {
 628                 up_write(&mm->mmap_sem);
 629                 mmput(mm);
 630         }
 631         return 0;
 632
 633 free_range:
 634         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 635              page_addr -= PAGE_SIZE) {
 636                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 637                 if (vma)
 638                         zap_page_range(vma, (size_t)page_addr +
 639                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 640 err_vm_insert_page_failed:
 641                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 642 err_map_kernel_failed:
 643                 __free_page(*page);
 644                 *page = NULL;
 645 err_alloc_page_failed:
 646                 ;
 647         }
 648 err_no_vma:
 649         if (mm) {
 650                 up_write(&mm->mmap_sem);
 651                 mmput(mm);
 652         }
 653         return -ENOMEM;
 654 }
 655
 656 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 657         size_t data_size, size_t offsets_size, int is_async)
 658 {
 659         struct rb_node *n = proc->free_buffers.rb_node;
 660         struct binder_buffer *buffer;
 661         size_t buffer_size;
 662         struct rb_node *best_fit = NULL;
 663         void *has_page_addr;
 664         void *end_page_addr;
 665         size_t size;
 666
 667         if (proc->vma == NULL) {
 668                 printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n",
 669                        proc->pid);
 670                 return NULL;
 671         }
 672
 673         size = ALIGN(data_size, sizeof(void *)) +
 674                 ALIGN(offsets_size, sizeof(void *));
 675
 676         if (size < data_size || size < offsets_size) {
 677                 binder_user_error("binder: %d: got transaction with invalid "
 678                         "size %zd-%zd\n", proc->pid, data_size, offsets_size);
 679                 return NULL;
 680         }
 681
 682         if (is_async &&
 683             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 684                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 685                         printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd f"
 686                                "ailed, no async space left\n", proc->pid, size);
 687                 return NULL;
 688         }
 689
 690         while (n) {
 691                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 692                 BUG_ON(!buffer->free);
 693                 buffer_size = binder_buffer_size(proc, buffer);
 694
 695                 if (size < buffer_size) {
 696                         best_fit = n;
 697                         n = n->rb_left;
 698                 } else if (size > buffer_size)
 699                         n = n->rb_right;
 700                 else {
 701                         best_fit = n;
 702                         break;
 703                 }
 704         }
 705         if (best_fit == NULL) {
 706                 printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, "
 707                        "no address space\n", proc->pid, size);
 708                 return NULL;
 709         }
 710         if (n == NULL) {
 711                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 712                 buffer_size = binder_buffer_size(proc, buffer);
 713         }
 714         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 715                 printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd got buff"
 716                        "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
 717
 718         has_page_addr =
 719                 (void *)(((size_t)buffer->data + buffer_size) & PAGE_MASK);
 720         if (n == NULL) {
 721                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 722                         buffer_size = size; /* no room for other buffers */
 723                 else
 724                         buffer_size = size + sizeof(struct binder_buffer);
 725         }
 726         end_page_addr = (void *)PAGE_ALIGN((size_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((size_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                 list_add(&new_buffer->entry, &buffer->entry);
 739                 new_buffer->free = 1;
 740                 binder_insert_free_buffer(proc, new_buffer);
 741         }
 742         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 743                 printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd got "
 744                        "%p\n", proc->pid, size, buffer);
 745         buffer->data_size = data_size;
 746         buffer->offsets_size = offsets_size;
 747         buffer->async_transaction = is_async;
 748         if (is_async) {
 749                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 750                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
 751                         printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd "
 752                                "async free %zd\n", proc->pid, size,
 753                                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 *)((size_t)buffer & PAGE_MASK);
 762 }
 763
 764 static void *buffer_end_page(struct binder_buffer *buffer)
 765 {
 766         return (void *)(((size_t)(buffer + 1) - 1) & PAGE_MASK);
 767 }
 768
 769 static void binder_delete_free_buffer(
 770         struct binder_proc *proc, 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                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 784                         printk(KERN_INFO "binder: %d: merge free, buffer %p "
 785                                "share page with %p\n", 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                         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 797                                 printk(KERN_INFO "binder: %d: merge free, "
 798                                        "buffer %p share page with %p\n",
 799                                        proc->pid, buffer, prev);
 800                 }
 801         }
 802         list_del(&buffer->entry);
 803         if (free_page_start || free_page_end) {
 804                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 805                         printk(KERN_INFO "binder: %d: merge free, buffer %p do "
 806                                "not share page%s%s with with %p or %p\n",
 807                                proc->pid, buffer, free_page_start ? "" : " end",
 808                                free_page_end ? "" : " start", prev, next);
 809                 binder_update_page_range(proc, 0, free_page_start ?
 810                         buffer_start_page(buffer) : buffer_end_page(buffer),
 811                         (free_page_end ? buffer_end_page(buffer) :
 812                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 813         }
 814 }
 815
 816 static void binder_free_buf(
 817         struct binder_proc *proc, struct binder_buffer *buffer)
 818 {
 819         size_t size, buffer_size;
 820
 821         buffer_size = binder_buffer_size(proc, buffer);
 822
 823         size = ALIGN(buffer->data_size, sizeof(void *)) +
 824                 ALIGN(buffer->offsets_size, sizeof(void *));
 825         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 826                 printk(KERN_INFO "binder: %d: binder_free_buf %p size %zd buffer"
 827                        "_size %zd\n", proc->pid, buffer, size, buffer_size);
 828
 829         BUG_ON(buffer->free);
 830         BUG_ON(size > buffer_size);
 831         BUG_ON(buffer->transaction != NULL);
 832         BUG_ON((void *)buffer < proc->buffer);
 833         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 834
 835         if (buffer->async_transaction) {
 836                 proc->free_async_space += size + sizeof(struct binder_buffer);
 837                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
 838                         printk(KERN_INFO "binder: %d: binder_free_buf size %zd "
 839                                "async free %zd\n", proc->pid, size,
 840                                proc->free_async_space);
 841         }
 842
 843         binder_update_page_range(proc, 0,
 844                 (void *)PAGE_ALIGN((size_t)buffer->data),
 845                 (void *)(((size_t)buffer->data + buffer_size) & PAGE_MASK),
 846                 NULL);
 847         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 848         buffer->free = 1;
 849         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 850                 struct binder_buffer *next = list_entry(buffer->entry.next,
 851                                                 struct binder_buffer, entry);
 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                 if (prev->free) {
 861                         binder_delete_free_buffer(proc, buffer);
 862                         rb_erase(&prev->rb_node, &proc->free_buffers);
 863                         buffer = prev;
 864                 }
 865         }
 866         binder_insert_free_buffer(proc, buffer);
 867 }
 868
 869 static struct binder_node *
 870 binder_get_node(struct binder_proc *proc, void __user *ptr)
 871 {
 872         struct rb_node *n = proc->nodes.rb_node;
 873         struct binder_node *node;
 874
 875         while (n) {
 876                 node = rb_entry(n, struct binder_node, rb_node);
 877
 878                 if (ptr < node->ptr)
 879                         n = n->rb_left;
 880                 else if (ptr > node->ptr)
 881                         n = n->rb_right;
 882                 else
 883                         return node;
 884         }
 885         return NULL;
 886 }
 887
 888 static struct binder_node *
 889 binder_new_node(struct binder_proc *proc, void __user *ptr, void __user *cookie)
 890 {
 891         struct rb_node **p = &proc->nodes.rb_node;
 892         struct rb_node *parent = NULL;
 893         struct binder_node *node;
 894
 895         while (*p) {
 896                 parent = *p;
 897                 node = rb_entry(parent, struct binder_node, rb_node);
 898
 899                 if (ptr < node->ptr)
 900                         p = &(*p)->rb_left;
 901                 else if (ptr > node->ptr)
 902                         p = &(*p)->rb_right;
 903                 else
 904                         return NULL;
 905         }
 906
 907         node = kzalloc(sizeof(*node), GFP_KERNEL);
 908         if (node == NULL)
 909                 return NULL;
 910         binder_stats.obj_created[BINDER_STAT_NODE]++;
 911         rb_link_node(&node->rb_node, parent, p);
 912         rb_insert_color(&node->rb_node, &proc->nodes);
 913         node->debug_id = ++binder_last_id;
 914         node->proc = proc;
 915         node->ptr = ptr;
 916         node->cookie = cookie;
 917         node->work.type = BINDER_WORK_NODE;
 918         INIT_LIST_HEAD(&node->work.entry);
 919         INIT_LIST_HEAD(&node->async_todo);
 920         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
 921                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p created\n",
 922                        proc->pid, current->pid, node->debug_id,
 923                        node->ptr, node->cookie);
 924         return node;
 925 }
 926
 927 static int
 928 binder_inc_node(struct binder_node *node, int strong, int internal,
 929                 struct list_head *target_list)
 930 {
 931         if (strong) {
 932                 if (internal) {
 933                         if (target_list == NULL &&
 934                             node->internal_strong_refs == 0 &&
 935                             !(node == binder_context_mgr_node &&
 936                             node->has_strong_ref)) {
 937                                 printk(KERN_ERR "binder: invalid inc strong "
 938                                         "node for %d\n", node->debug_id);
 939                                 return -EINVAL;
 940                         }
 941                         node->internal_strong_refs++;
 942                 } else
 943                         node->local_strong_refs++;
 944                 if (!node->has_strong_ref && target_list) {
 945                         list_del_init(&node->work.entry);
 946                         list_add_tail(&node->work.entry, target_list);
 947                 }
 948         } else {
 949                 if (!internal)
 950                         node->local_weak_refs++;
 951                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 952                         if (target_list == NULL) {
 953                                 printk(KERN_ERR "binder: invalid inc weak node "
 954                                         "for %d\n", node->debug_id);
 955                                 return -EINVAL;
 956                         }
 957                         list_add_tail(&node->work.entry, target_list);
 958                 }
 959         }
 960         return 0;
 961 }
 962
 963 static int
 964 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                                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
 991                                         printk(KERN_INFO "binder: refless node %d deleted\n", node->debug_id);
 992                         } else {
 993                                 hlist_del(&node->dead_node);
 994                                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
 995                                         printk(KERN_INFO "binder: dead node %d deleted\n", node->debug_id);
 996                         }
 997                         kfree(node);
 998                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
 999                 }
1000         }
1001
1002         return 0;
1003 }
1004
1005
1006 static struct binder_ref *
1007 binder_get_ref(struct binder_proc *proc, uint32_t desc)
1008 {
1009         struct rb_node *n = proc->refs_by_desc.rb_node;
1010         struct binder_ref *ref;
1011
1012         while (n) {
1013                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1014
1015                 if (desc < ref->desc)
1016                         n = n->rb_left;
1017                 else if (desc > ref->desc)
1018                         n = n->rb_right;
1019                 else
1020                         return ref;
1021         }
1022         return NULL;
1023 }
1024
1025 static struct binder_ref *
1026 binder_get_ref_for_node(struct binder_proc *proc, struct binder_node *node)
1027 {
1028         struct rb_node *n;
1029         struct rb_node **p = &proc->refs_by_node.rb_node;
1030         struct rb_node *parent = NULL;
1031         struct binder_ref *ref, *new_ref;
1032
1033         while (*p) {
1034                 parent = *p;
1035                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1036
1037                 if (node < ref->node)
1038                         p = &(*p)->rb_left;
1039                 else if (node > ref->node)
1040                         p = &(*p)->rb_right;
1041                 else
1042                         return ref;
1043         }
1044         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1045         if (new_ref == NULL)
1046                 return NULL;
1047         binder_stats.obj_created[BINDER_STAT_REF]++;
1048         new_ref->debug_id = ++binder_last_id;
1049         new_ref->proc = proc;
1050         new_ref->node = node;
1051         rb_link_node(&new_ref->rb_node_node, parent, p);
1052         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1053
1054         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1055         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1056                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1057                 if (ref->desc > new_ref->desc)
1058                         break;
1059                 new_ref->desc = ref->desc + 1;
1060         }
1061
1062         p = &proc->refs_by_desc.rb_node;
1063         while (*p) {
1064                 parent = *p;
1065                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1066
1067                 if (new_ref->desc < ref->desc)
1068                         p = &(*p)->rb_left;
1069                 else if (new_ref->desc > ref->desc)
1070                         p = &(*p)->rb_right;
1071                 else
1072                         BUG();
1073         }
1074         rb_link_node(&new_ref->rb_node_desc, parent, p);
1075         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1076         if (node) {
1077                 hlist_add_head(&new_ref->node_entry, &node->refs);
1078                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
1079                         printk(KERN_INFO "binder: %d new ref %d desc %d for "
1080                                 "node %d\n", proc->pid, new_ref->debug_id,
1081                                 new_ref->desc, node->debug_id);
1082         } else {
1083                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
1084                         printk(KERN_INFO "binder: %d new ref %d desc %d for "
1085                                 "dead node\n", proc->pid, new_ref->debug_id,
1086                                 new_ref->desc);
1087         }
1088         return new_ref;
1089 }
1090
1091 static void
1092 binder_delete_ref(struct binder_ref *ref)
1093 {
1094         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
1095                 printk(KERN_INFO "binder: %d delete ref %d desc %d for "
1096                         "node %d\n", ref->proc->pid, ref->debug_id,
1097                         ref->desc, ref->node->debug_id);
1098         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1099         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1100         if (ref->strong)
1101                 binder_dec_node(ref->node, 1, 1);
1102         hlist_del(&ref->node_entry);
1103         binder_dec_node(ref->node, 0, 1);
1104         if (ref->death) {
1105                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
1106                         printk(KERN_INFO "binder: %d delete ref %d desc %d "
1107                                 "has death notification\n", ref->proc->pid,
1108                                 ref->debug_id, ref->desc);
1109                 list_del(&ref->death->work.entry);
1110                 kfree(ref->death);
1111                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
1112         }
1113         kfree(ref);
1114         binder_stats.obj_deleted[BINDER_STAT_REF]++;
1115 }
1116
1117 static int
1118 binder_inc_ref(
1119         struct binder_ref *ref, int strong, struct list_head *target_list)
1120 {
1121         int ret;
1122         if (strong) {
1123                 if (ref->strong == 0) {
1124                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1125                         if (ret)
1126                                 return ret;
1127                 }
1128                 ref->strong++;
1129         } else {
1130                 if (ref->weak == 0) {
1131                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1132                         if (ret)
1133                                 return ret;
1134                 }
1135                 ref->weak++;
1136         }
1137         return 0;
1138 }
1139
1140
1141 static int
1142 binder_dec_ref(struct binder_ref *ref, int strong)
1143 {
1144         if (strong) {
1145                 if (ref->strong == 0) {
1146                         binder_user_error("binder: %d invalid dec strong, "
1147                                           "ref %d desc %d s %d w %d\n",
1148                                           ref->proc->pid, ref->debug_id,
1149                                           ref->desc, ref->strong, ref->weak);
1150                         return -EINVAL;
1151                 }
1152                 ref->strong--;
1153                 if (ref->strong == 0) {
1154                         int ret;
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("binder: %d invalid dec weak, "
1162                                           "ref %d desc %d s %d w %d\n",
1163                                           ref->proc->pid, ref->debug_id,
1164                                           ref->desc, ref->strong, ref->weak);
1165                         return -EINVAL;
1166                 }
1167                 ref->weak--;
1168         }
1169         if (ref->strong == 0 && ref->weak == 0)
1170                 binder_delete_ref(ref);
1171         return 0;
1172 }
1173
1174 static void
1175 binder_pop_transaction(
1176         struct binder_thread *target_thread, struct binder_transaction *t)
1177 {
1178         if (target_thread) {
1179                 BUG_ON(target_thread->transaction_stack != t);
1180                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1181                 target_thread->transaction_stack =
1182                         target_thread->transaction_stack->from_parent;
1183                 t->from = NULL;
1184         }
1185         t->need_reply = 0;
1186         if (t->buffer)
1187                 t->buffer->transaction = NULL;
1188         kfree(t);
1189         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1190 }
1191
1192 static void
1193 binder_send_failed_reply(struct binder_transaction *t, uint32_t error_code)
1194 {
1195         struct binder_thread *target_thread;
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                                 if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1208                                         printk(KERN_INFO "binder: send failed reply for transaction %d to %d:%d\n",
1209                                                t->debug_id, target_thread->proc->pid, target_thread->pid);
1210
1211                                 binder_pop_transaction(target_thread, t);
1212                                 target_thread->return_error = error_code;
1213                                 wake_up_interruptible(&target_thread->wait);
1214                         } else {
1215                                 printk(KERN_ERR "binder: reply failed, target "
1216                                         "thread, %d:%d, has error code %d "
1217                                         "already\n", target_thread->proc->pid,
1218                                         target_thread->pid,
1219                                         target_thread->return_error);
1220                         }
1221                         return;
1222                 } else {
1223                         struct binder_transaction *next = t->from_parent;
1224
1225                         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1226                                 printk(KERN_INFO "binder: send failed reply "
1227                                         "for transaction %d, target dead\n",
1228                                         t->debug_id);
1229
1230                         binder_pop_transaction(target_thread, t);
1231                         if (next == NULL) {
1232                                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
1233                                         printk(KERN_INFO "binder: reply failed,"
1234                                                 " no target thread at root\n");
1235                                 return;
1236                         }
1237                         t = next;
1238                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
1239                                 printk(KERN_INFO "binder: reply failed, no targ"
1240                                         "et thread -- retry %d\n", t->debug_id);
1241                 }
1242         }
1243 }
1244
1245 static void
1246 binder_transaction_buffer_release(struct binder_proc *proc,
1247                         struct binder_buffer *buffer, size_t *failed_at);
1248
1249 static void
1250 binder_transaction(struct binder_proc *proc, struct binder_thread *thread,
1251         struct binder_transaction_data *tr, int reply)
1252 {
1253         struct binder_transaction *t;
1254         struct binder_work *tcomplete;
1255         size_t *offp, *off_end;
1256         struct binder_proc *target_proc;
1257         struct binder_thread *target_thread = NULL;
1258         struct binder_node *target_node = NULL;
1259         struct list_head *target_list;
1260         wait_queue_head_t *target_wait;
1261         struct binder_transaction *in_reply_to = NULL;
1262         struct binder_transaction_log_entry *e;
1263         uint32_t return_error;
1264
1265         e = binder_transaction_log_add(&binder_transaction_log);
1266         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1267         e->from_proc = proc->pid;
1268         e->from_thread = thread->pid;
1269         e->target_handle = tr->target.handle;
1270         e->data_size = tr->data_size;
1271         e->offsets_size = tr->offsets_size;
1272
1273         if (reply) {
1274                 in_reply_to = thread->transaction_stack;
1275                 if (in_reply_to == NULL) {
1276                         binder_user_error("binder: %d:%d got reply transaction "
1277                                           "with no transaction stack\n",
1278                                           proc->pid, thread->pid);
1279                         return_error = BR_FAILED_REPLY;
1280                         goto err_empty_call_stack;
1281                 }
1282                 binder_set_nice(in_reply_to->saved_priority);
1283                 if (in_reply_to->to_thread != thread) {
1284                         binder_user_error("binder: %d:%d got reply transaction "
1285                                 "with bad transaction stack,"
1286                                 " transaction %d has target %d:%d\n",
1287                                 proc->pid, thread->pid, in_reply_to->debug_id,
1288                                 in_reply_to->to_proc ?
1289                                 in_reply_to->to_proc->pid : 0,
1290                                 in_reply_to->to_thread ?
1291                                 in_reply_to->to_thread->pid : 0);
1292                         return_error = BR_FAILED_REPLY;
1293                         in_reply_to = NULL;
1294                         goto err_bad_call_stack;
1295                 }
1296                 thread->transaction_stack = in_reply_to->to_parent;
1297                 target_thread = in_reply_to->from;
1298                 if (target_thread == NULL) {
1299                         return_error = BR_DEAD_REPLY;
1300                         goto err_dead_binder;
1301                 }
1302                 if (target_thread->transaction_stack != in_reply_to) {
1303                         binder_user_error("binder: %d:%d got reply transaction "
1304                                 "with bad target transaction stack %d, "
1305                                 "expected %d\n",
1306                                 proc->pid, thread->pid,
1307                                 target_thread->transaction_stack ?
1308                                 target_thread->transaction_stack->debug_id : 0,
1309                                 in_reply_to->debug_id);
1310                         return_error = BR_FAILED_REPLY;
1311                         in_reply_to = NULL;
1312                         target_thread = NULL;
1313                         goto err_dead_binder;
1314                 }
1315                 target_proc = target_thread->proc;
1316         } else {
1317                 if (tr->target.handle) {
1318                         struct binder_ref *ref;
1319                         ref = binder_get_ref(proc, tr->target.handle);
1320                         if (ref == NULL) {
1321                                 binder_user_error("binder: %d:%d got "
1322                                         "transaction to invalid handle\n",
1323                                         proc->pid, thread->pid);
1324                                 return_error = BR_FAILED_REPLY;
1325                                 goto err_invalid_target_handle;
1326                         }
1327                         target_node = ref->node;
1328                 } else {
1329                         target_node = binder_context_mgr_node;
1330                         if (target_node == NULL) {
1331                                 return_error = BR_DEAD_REPLY;
1332                                 goto err_no_context_mgr_node;
1333                         }
1334                 }
1335                 e->to_node = target_node->debug_id;
1336                 target_proc = target_node->proc;
1337                 if (target_proc == NULL) {
1338                         return_error = BR_DEAD_REPLY;
1339                         goto err_dead_binder;
1340                 }
1341                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1342                         struct binder_transaction *tmp;
1343                         tmp = thread->transaction_stack;
1344                         while (tmp) {
1345                                 if (tmp->from && tmp->from->proc == target_proc)
1346                                         target_thread = tmp->from;
1347                                 tmp = tmp->from_parent;
1348                         }
1349                 }
1350         }
1351         if (target_thread) {
1352                 e->to_thread = target_thread->pid;
1353                 target_list = &target_thread->todo;
1354                 target_wait = &target_thread->wait;
1355         } else {
1356                 target_list = &target_proc->todo;
1357                 target_wait = &target_proc->wait;
1358         }
1359         e->to_proc = target_proc->pid;
1360
1361         /* TODO: reuse incoming transaction for reply */
1362         t = kzalloc(sizeof(*t), GFP_KERNEL);
1363         if (t == NULL) {
1364                 return_error = BR_FAILED_REPLY;
1365                 goto err_alloc_t_failed;
1366         }
1367         binder_stats.obj_created[BINDER_STAT_TRANSACTION]++;
1368
1369         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1370         if (tcomplete == NULL) {
1371                 return_error = BR_FAILED_REPLY;
1372                 goto err_alloc_tcomplete_failed;
1373         }
1374         binder_stats.obj_created[BINDER_STAT_TRANSACTION_COMPLETE]++;
1375
1376         t->debug_id = ++binder_last_id;
1377         e->debug_id = t->debug_id;
1378
1379         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION) {
1380                 if (reply)
1381                         printk(KERN_INFO "binder: %d:%d BC_REPLY %d -> %d:%d, "
1382                                "data %p-%p size %zd-%zd\n",
1383                                proc->pid, thread->pid, t->debug_id,
1384                                target_proc->pid, target_thread->pid,
1385                                tr->data.ptr.buffer, tr->data.ptr.offsets,
1386                                tr->data_size, tr->offsets_size);
1387                 else
1388                         printk(KERN_INFO "binder: %d:%d BC_TRANSACTION %d -> "
1389                                "%d - node %d, data %p-%p size %zd-%zd\n",
1390                                proc->pid, thread->pid, t->debug_id,
1391                                target_proc->pid, target_node->debug_id,
1392                                tr->data.ptr.buffer, tr->data.ptr.offsets,
1393                                tr->data_size, tr->offsets_size);
1394         }
1395
1396         if (!reply && !(tr->flags & TF_ONE_WAY))
1397                 t->from = thread;
1398         else
1399                 t->from = NULL;
1400         t->sender_euid = proc->tsk->cred->euid;
1401         t->to_proc = target_proc;
1402         t->to_thread = target_thread;
1403         t->code = tr->code;
1404         t->flags = tr->flags;
1405         t->priority = task_nice(current);
1406         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1407                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1408         if (t->buffer == NULL) {
1409                 return_error = BR_FAILED_REPLY;
1410                 goto err_binder_alloc_buf_failed;
1411         }
1412         t->buffer->allow_user_free = 0;
1413         t->buffer->debug_id = t->debug_id;
1414         t->buffer->transaction = t;
1415         t->buffer->target_node = target_node;
1416         if (target_node)
1417                 binder_inc_node(target_node, 1, 0, NULL);
1418
1419         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1420
1421         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1422                 binder_user_error("binder: %d:%d got transaction with invalid "
1423                         "data ptr\n", proc->pid, thread->pid);
1424                 return_error = BR_FAILED_REPLY;
1425                 goto err_copy_data_failed;
1426         }
1427         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1428                 binder_user_error("binder: %d:%d got transaction with invalid "
1429                         "offsets ptr\n", proc->pid, thread->pid);
1430                 return_error = BR_FAILED_REPLY;
1431                 goto err_copy_data_failed;
1432         }
1433         off_end = (void *)offp + tr->offsets_size;
1434         for (; offp < off_end; offp++) {
1435                 struct flat_binder_object *fp;
1436                 if (*offp > t->buffer->data_size - sizeof(*fp)) {
1437                         binder_user_error("binder: %d:%d got transaction with "
1438                                 "invalid offset, %zd\n",
1439                                 proc->pid, thread->pid, *offp);
1440                         return_error = BR_FAILED_REPLY;
1441                         goto err_bad_offset;
1442                 }
1443                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1444                 switch (fp->type) {
1445                 case BINDER_TYPE_BINDER:
1446                 case BINDER_TYPE_WEAK_BINDER: {
1447                         struct binder_ref *ref;
1448                         struct binder_node *node = binder_get_node(proc, fp->binder);
1449                         if (node == NULL) {
1450                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1451                                 if (node == NULL) {
1452                                         return_error = BR_FAILED_REPLY;
1453                                         goto err_binder_new_node_failed;
1454                                 }
1455                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1456                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1457                         }
1458                         if (fp->cookie != node->cookie) {
1459                                 binder_user_error("binder: %d:%d sending u%p "
1460                                         "node %d, cookie mismatch %p != %p\n",
1461                                         proc->pid, thread->pid,
1462                                         fp->binder, node->debug_id,
1463                                         fp->cookie, node->cookie);
1464                                 goto err_binder_get_ref_for_node_failed;
1465                         }
1466                         ref = binder_get_ref_for_node(target_proc, node);
1467                         if (ref == NULL) {
1468                                 return_error = BR_FAILED_REPLY;
1469                                 goto err_binder_get_ref_for_node_failed;
1470                         }
1471                         if (fp->type == BINDER_TYPE_BINDER)
1472                                 fp->type = BINDER_TYPE_HANDLE;
1473                         else
1474                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1475                         fp->handle = ref->desc;
1476                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE, &thread->todo);
1477                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1478                                 printk(KERN_INFO "        node %d u%p -> ref %d desc %d\n",
1479                                        node->debug_id, node->ptr, ref->debug_id, ref->desc);
1480                 } break;
1481                 case BINDER_TYPE_HANDLE:
1482                 case BINDER_TYPE_WEAK_HANDLE: {
1483                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1484                         if (ref == NULL) {
1485                                 binder_user_error("binder: %d:%d got "
1486                                         "transaction with invalid "
1487                                         "handle, %ld\n", proc->pid,
1488                                         thread->pid, fp->handle);
1489                                 return_error = BR_FAILED_REPLY;
1490                                 goto err_binder_get_ref_failed;
1491                         }
1492                         if (ref->node->proc == target_proc) {
1493                                 if (fp->type == BINDER_TYPE_HANDLE)
1494                                         fp->type = BINDER_TYPE_BINDER;
1495                                 else
1496                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1497                                 fp->binder = ref->node->ptr;
1498                                 fp->cookie = ref->node->cookie;
1499                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1500                                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1501                                         printk(KERN_INFO "        ref %d desc %d -> node %d u%p\n",
1502                                                ref->debug_id, ref->desc, ref->node->debug_id, ref->node->ptr);
1503                         } else {
1504                                 struct binder_ref *new_ref;
1505                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1506                                 if (new_ref == NULL) {
1507                                         return_error = BR_FAILED_REPLY;
1508                                         goto err_binder_get_ref_for_node_failed;
1509                                 }
1510                                 fp->handle = new_ref->desc;
1511                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1512                                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1513                                         printk(KERN_INFO "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1514                                                ref->debug_id, ref->desc, new_ref->debug_id, new_ref->desc, ref->node->debug_id);
1515                         }
1516                 } break;
1517
1518                 case BINDER_TYPE_FD: {
1519                         int target_fd;
1520                         struct file *file;
1521
1522                         if (reply) {
1523                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1524                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1525                                                 proc->pid, thread->pid, fp->handle);
1526                                         return_error = BR_FAILED_REPLY;
1527                                         goto err_fd_not_allowed;
1528                                 }
1529                         } else if (!target_node->accept_fds) {
1530                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1531                                         proc->pid, thread->pid, fp->handle);
1532                                 return_error = BR_FAILED_REPLY;
1533                                 goto err_fd_not_allowed;
1534                         }
1535
1536                         file = fget(fp->handle);
1537                         if (file == NULL) {
1538                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1539                                         proc->pid, thread->pid, fp->handle);
1540                                 return_error = BR_FAILED_REPLY;
1541                                 goto err_fget_failed;
1542                         }
1543                         target_fd = task_get_unused_fd_flags(target_proc->tsk, O_CLOEXEC);
1544                         if (target_fd < 0) {
1545                                 fput(file);
1546                                 return_error = BR_FAILED_REPLY;
1547                                 goto err_get_unused_fd_failed;
1548                         }
1549                         task_fd_install(target_proc->tsk, target_fd, file);
1550                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1551                                 printk(KERN_INFO "        fd %ld -> %d\n", fp->handle, target_fd);
1552                         /* TODO: fput? */
1553                         fp->handle = target_fd;
1554                 } break;
1555
1556                 default:
1557                         binder_user_error("binder: %d:%d got transactio"
1558                                 "n with invalid object type, %lx\n",
1559                                 proc->pid, thread->pid, fp->type);
1560                         return_error = BR_FAILED_REPLY;
1561                         goto err_bad_object_type;
1562                 }
1563         }
1564         if (reply) {
1565                 BUG_ON(t->buffer->async_transaction != 0);
1566                 binder_pop_transaction(target_thread, in_reply_to);
1567         } else if (!(t->flags & TF_ONE_WAY)) {
1568                 BUG_ON(t->buffer->async_transaction != 0);
1569                 t->need_reply = 1;
1570                 t->from_parent = thread->transaction_stack;
1571                 thread->transaction_stack = t;
1572         } else {
1573                 BUG_ON(target_node == NULL);
1574                 BUG_ON(t->buffer->async_transaction != 1);
1575                 if (target_node->has_async_transaction) {
1576                         target_list = &target_node->async_todo;
1577                         target_wait = NULL;
1578                 } else
1579                         target_node->has_async_transaction = 1;
1580         }
1581         t->work.type = BINDER_WORK_TRANSACTION;
1582         list_add_tail(&t->work.entry, target_list);
1583         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1584         list_add_tail(&tcomplete->entry, &thread->todo);
1585         if (target_wait)
1586                 wake_up_interruptible(target_wait);
1587         return;
1588
1589 err_get_unused_fd_failed:
1590 err_fget_failed:
1591 err_fd_not_allowed:
1592 err_binder_get_ref_for_node_failed:
1593 err_binder_get_ref_failed:
1594 err_binder_new_node_failed:
1595 err_bad_object_type:
1596 err_bad_offset:
1597 err_copy_data_failed:
1598         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1599         t->buffer->transaction = NULL;
1600         binder_free_buf(target_proc, t->buffer);
1601 err_binder_alloc_buf_failed:
1602         kfree(tcomplete);
1603         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
1604 err_alloc_tcomplete_failed:
1605         kfree(t);
1606         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1607 err_alloc_t_failed:
1608 err_bad_call_stack:
1609 err_empty_call_stack:
1610 err_dead_binder:
1611 err_invalid_target_handle:
1612 err_no_context_mgr_node:
1613         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1614                 printk(KERN_INFO "binder: %d:%d transaction failed %d, size"
1615                                 "%zd-%zd\n",
1616                            proc->pid, thread->pid, return_error,
1617                            tr->data_size, tr->offsets_size);
1618
1619         {
1620                 struct binder_transaction_log_entry *fe;
1621                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1622                 *fe = *e;
1623         }
1624
1625         BUG_ON(thread->return_error != BR_OK);
1626         if (in_reply_to) {
1627                 thread->return_error = BR_TRANSACTION_COMPLETE;
1628                 binder_send_failed_reply(in_reply_to, return_error);
1629         } else
1630                 thread->return_error = return_error;
1631 }
1632
1633 static void
1634 binder_transaction_buffer_release(struct binder_proc *proc, struct binder_buffer *buffer, size_t *failed_at)
1635 {
1636         size_t *offp, *off_end;
1637         int debug_id = buffer->debug_id;
1638
1639         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1640                 printk(KERN_INFO "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1641                            proc->pid, buffer->debug_id,
1642                            buffer->data_size, buffer->offsets_size, failed_at);
1643
1644         if (buffer->target_node)
1645                 binder_dec_node(buffer->target_node, 1, 0);
1646
1647         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1648         if (failed_at)
1649                 off_end = failed_at;
1650         else
1651                 off_end = (void *)offp + buffer->offsets_size;
1652         for (; offp < off_end; offp++) {
1653                 struct flat_binder_object *fp;
1654                 if (*offp > buffer->data_size - sizeof(*fp)) {
1655                         printk(KERN_ERR "binder: transaction release %d bad"
1656                                         "offset %zd, size %zd\n", debug_id, *offp, buffer->data_size);
1657                         continue;
1658                 }
1659                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1660                 switch (fp->type) {
1661                 case BINDER_TYPE_BINDER:
1662                 case BINDER_TYPE_WEAK_BINDER: {
1663                         struct binder_node *node = binder_get_node(proc, fp->binder);
1664                         if (node == NULL) {
1665                                 printk(KERN_ERR "binder: transaction release %d bad node %p\n", debug_id, fp->binder);
1666                                 break;
1667                         }
1668                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1669                                 printk(KERN_INFO "        node %d u%p\n",
1670                                        node->debug_id, node->ptr);
1671                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1672                 } break;
1673                 case BINDER_TYPE_HANDLE:
1674                 case BINDER_TYPE_WEAK_HANDLE: {
1675                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1676                         if (ref == NULL) {
1677                                 printk(KERN_ERR "binder: transaction release %d bad handle %ld\n", debug_id, fp->handle);
1678                                 break;
1679                         }
1680                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1681                                 printk(KERN_INFO "        ref %d desc %d (node %d)\n",
1682                                        ref->debug_id, ref->desc, ref->node->debug_id);
1683                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1684                 } break;
1685
1686                 case BINDER_TYPE_FD:
1687                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1688                                 printk(KERN_INFO "        fd %ld\n", fp->handle);
1689                         if (failed_at)
1690                                 task_close_fd(proc->tsk, fp->handle);
1691                         break;
1692
1693                 default:
1694                         printk(KERN_ERR "binder: transaction release %d bad object type %lx\n", debug_id, fp->type);
1695                         break;
1696                 }
1697         }
1698 }
1699
1700 int
1701 binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1702                     void __user *buffer, int size, signed long *consumed)
1703 {
1704         uint32_t cmd;
1705         void __user *ptr = buffer + *consumed;
1706         void __user *end = buffer + size;
1707
1708         while (ptr < end && thread->return_error == BR_OK) {
1709                 if (get_user(cmd, (uint32_t __user *)ptr))
1710                         return -EFAULT;
1711                 ptr += sizeof(uint32_t);
1712                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1713                         binder_stats.bc[_IOC_NR(cmd)]++;
1714                         proc->stats.bc[_IOC_NR(cmd)]++;
1715                         thread->stats.bc[_IOC_NR(cmd)]++;
1716                 }
1717                 switch (cmd) {
1718                 case BC_INCREFS:
1719                 case BC_ACQUIRE:
1720                 case BC_RELEASE:
1721                 case BC_DECREFS: {
1722                         uint32_t target;
1723                         struct binder_ref *ref;
1724                         const char *debug_string;
1725
1726                         if (get_user(target, (uint32_t __user *)ptr))
1727                                 return -EFAULT;
1728                         ptr += sizeof(uint32_t);
1729                         if (target == 0 && binder_context_mgr_node &&
1730                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1731                                 ref = binder_get_ref_for_node(proc,
1732                                                binder_context_mgr_node);
1733                                 if (ref->desc != target) {
1734                                         binder_user_error("binder: %d:"
1735                                                 "%d tried to acquire "
1736                                                 "reference to desc 0, "
1737                                                 "got %d instead\n",
1738                                                 proc->pid, thread->pid,
1739                                                 ref->desc);
1740                                 }
1741                         } else
1742                                 ref = binder_get_ref(proc, target);
1743                         if (ref == NULL) {
1744                                 binder_user_error("binder: %d:%d refcou"
1745                                         "nt change on invalid ref %d\n",
1746                                         proc->pid, thread->pid, target);
1747                                 break;
1748                         }
1749                         switch (cmd) {
1750                         case BC_INCREFS:
1751                                 debug_string = "IncRefs";
1752                                 binder_inc_ref(ref, 0, NULL);
1753                                 break;
1754                         case BC_ACQUIRE:
1755                                 debug_string = "Acquire";
1756                                 binder_inc_ref(ref, 1, NULL);
1757                                 break;
1758                         case BC_RELEASE:
1759                                 debug_string = "Release";
1760                                 binder_dec_ref(ref, 1);
1761                                 break;
1762                         case BC_DECREFS:
1763                         default:
1764                                 debug_string = "DecRefs";
1765                                 binder_dec_ref(ref, 0);
1766                                 break;
1767                         }
1768                         if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
1769                                 printk(KERN_INFO "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1770                                        proc->pid, thread->pid, debug_string, ref->debug_id, ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1771                         break;
1772                 }
1773                 case BC_INCREFS_DONE:
1774                 case BC_ACQUIRE_DONE: {
1775                         void __user *node_ptr;
1776                         void *cookie;
1777                         struct binder_node *node;
1778
1779                         if (get_user(node_ptr, (void * __user *)ptr))
1780                                 return -EFAULT;
1781                         ptr += sizeof(void *);
1782                         if (get_user(cookie, (void * __user *)ptr))
1783                                 return -EFAULT;
1784                         ptr += sizeof(void *);
1785                         node = binder_get_node(proc, node_ptr);
1786                         if (node == NULL) {
1787                                 binder_user_error("binder: %d:%d "
1788                                         "%s u%p no match\n",
1789                                         proc->pid, thread->pid,
1790                                         cmd == BC_INCREFS_DONE ?
1791                                         "BC_INCREFS_DONE" :
1792                                         "BC_ACQUIRE_DONE",
1793                                         node_ptr);
1794                                 break;
1795                         }
1796                         if (cookie != node->cookie) {
1797                                 binder_user_error("binder: %d:%d %s u%p node %d"
1798                                         " cookie mismatch %p != %p\n",
1799                                         proc->pid, thread->pid,
1800                                         cmd == BC_INCREFS_DONE ?
1801                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1802                                         node_ptr, node->debug_id,
1803                                         cookie, node->cookie);
1804                                 break;
1805                         }
1806                         if (cmd == BC_ACQUIRE_DONE) {
1807                                 if (node->pending_strong_ref == 0) {
1808                                         binder_user_error("binder: %d:%d "
1809                                                 "BC_ACQUIRE_DONE node %d has "
1810                                                 "no pending acquire request\n",
1811                                                 proc->pid, thread->pid,
1812                                                 node->debug_id);
1813                                         break;
1814                                 }
1815                                 node->pending_strong_ref = 0;
1816                         } else {
1817                                 if (node->pending_weak_ref == 0) {
1818                                         binder_user_error("binder: %d:%d "
1819                                                 "BC_INCREFS_DONE node %d has "
1820                                                 "no pending increfs request\n",
1821                                                 proc->pid, thread->pid,
1822                                                 node->debug_id);
1823                                         break;
1824                                 }
1825                                 node->pending_weak_ref = 0;
1826                         }
1827                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1828                         if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
1829                                 printk(KERN_INFO "binder: %d:%d %s node %d ls %d lw %d\n",
1830                                        proc->pid, thread->pid, cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE", node->debug_id, node->local_strong_refs, node->local_weak_refs);
1831                         break;
1832                 }
1833                 case BC_ATTEMPT_ACQUIRE:
1834                         printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported\n");
1835                         return -EINVAL;
1836                 case BC_ACQUIRE_RESULT:
1837                         printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported\n");
1838                         return -EINVAL;
1839
1840                 case BC_FREE_BUFFER: {
1841                         void __user *data_ptr;
1842                         struct binder_buffer *buffer;
1843
1844                         if (get_user(data_ptr, (void * __user *)ptr))
1845                                 return -EFAULT;
1846                         ptr += sizeof(void *);
1847
1848                         buffer = binder_buffer_lookup(proc, data_ptr);
1849                         if (buffer == NULL) {
1850                                 binder_user_error("binder: %d:%d "
1851                                         "BC_FREE_BUFFER u%p no match\n",
1852                                         proc->pid, thread->pid, data_ptr);
1853                                 break;
1854                         }
1855                         if (!buffer->allow_user_free) {
1856                                 binder_user_error("binder: %d:%d "
1857                                         "BC_FREE_BUFFER u%p matched "
1858                                         "unreturned buffer\n",
1859                                         proc->pid, thread->pid, data_ptr);
1860                                 break;
1861                         }
1862                         if (binder_debug_mask & BINDER_DEBUG_FREE_BUFFER)
1863                                 printk(KERN_INFO "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1864                                        proc->pid, thread->pid, data_ptr, buffer->debug_id,
1865                                        buffer->transaction ? "active" : "finished");
1866
1867                         if (buffer->transaction) {
1868                                 buffer->transaction->buffer = NULL;
1869                                 buffer->transaction = NULL;
1870                         }
1871                         if (buffer->async_transaction && buffer->target_node) {
1872                                 BUG_ON(!buffer->target_node->has_async_transaction);
1873                                 if (list_empty(&buffer->target_node->async_todo))
1874                                         buffer->target_node->has_async_transaction = 0;
1875                                 else
1876                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1877                         }
1878                         binder_transaction_buffer_release(proc, buffer, NULL);
1879                         binder_free_buf(proc, buffer);
1880                         break;
1881                 }
1882
1883                 case BC_TRANSACTION:
1884                 case BC_REPLY: {
1885                         struct binder_transaction_data tr;
1886
1887                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1888                                 return -EFAULT;
1889                         ptr += sizeof(tr);
1890                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1891                         break;
1892                 }
1893
1894                 case BC_REGISTER_LOOPER:
1895                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
1896                                 printk(KERN_INFO "binder: %d:%d BC_REGISTER_LOOPER\n",
1897                                        proc->pid, thread->pid);
1898                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1899                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1900                                 binder_user_error("binder: %d:%d ERROR:"
1901                                         " BC_REGISTER_LOOPER called "
1902                                         "after BC_ENTER_LOOPER\n",
1903                                         proc->pid, thread->pid);
1904                         } else if (proc->requested_threads == 0) {
1905                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1906                                 binder_user_error("binder: %d:%d ERROR:"
1907                                         " BC_REGISTER_LOOPER called "
1908                                         "without request\n",
1909                                         proc->pid, thread->pid);
1910                         } else {
1911                                 proc->requested_threads--;
1912                                 proc->requested_threads_started++;
1913                         }
1914                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1915                         break;
1916                 case BC_ENTER_LOOPER:
1917                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
1918                                 printk(KERN_INFO "binder: %d:%d BC_ENTER_LOOPER\n",
1919                                        proc->pid, thread->pid);
1920                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1921                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1922                                 binder_user_error("binder: %d:%d ERROR:"
1923                                         " BC_ENTER_LOOPER called after "
1924                                         "BC_REGISTER_LOOPER\n",
1925                                         proc->pid, thread->pid);
1926                         }
1927                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1928                         break;
1929                 case BC_EXIT_LOOPER:
1930                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
1931                                 printk(KERN_INFO "binder: %d:%d BC_EXIT_LOOPER\n",
1932                                        proc->pid, thread->pid);
1933                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1934                         break;
1935
1936                 case BC_REQUEST_DEATH_NOTIFICATION:
1937                 case BC_CLEAR_DEATH_NOTIFICATION: {
1938                         uint32_t target;
1939                         void __user *cookie;
1940                         struct binder_ref *ref;
1941                         struct binder_ref_death *death;
1942
1943                         if (get_user(target, (uint32_t __user *)ptr))
1944                                 return -EFAULT;
1945                         ptr += sizeof(uint32_t);
1946                         if (get_user(cookie, (void __user * __user *)ptr))
1947                                 return -EFAULT;
1948                         ptr += sizeof(void *);
1949                         ref = binder_get_ref(proc, target);
1950                         if (ref == NULL) {
1951                                 binder_user_error("binder: %d:%d %s "
1952                                         "invalid ref %d\n",
1953                                         proc->pid, thread->pid,
1954                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1955                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1956                                         "BC_CLEAR_DEATH_NOTIFICATION",
1957                                         target);
1958                                 break;
1959                         }
1960
1961                         if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
1962                                 printk(KERN_INFO "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
1963                                        proc->pid, thread->pid,
1964                                        cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1965                                        "BC_REQUEST_DEATH_NOTIFICATION" :
1966                                        "BC_CLEAR_DEATH_NOTIFICATION",
1967                                        cookie, ref->debug_id, ref->desc,
1968                                        ref->strong, ref->weak, ref->node->debug_id);
1969
1970                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1971                                 if (ref->death) {
1972                                         binder_user_error("binder: %d:%"
1973                                                 "d BC_REQUEST_DEATH_NOTI"
1974                                                 "FICATION death notific"
1975                                                 "ation already set\n",
1976                                                 proc->pid, thread->pid);
1977                                         break;
1978                                 }
1979                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
1980                                 if (death == NULL) {
1981                                         thread->return_error = BR_ERROR;
1982                                         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1983                                                 printk(KERN_INFO "binder: %d:%d "
1984                                                         "BC_REQUEST_DEATH_NOTIFICATION failed\n",
1985                                                         proc->pid, thread->pid);
1986                                         break;
1987                                 }
1988                                 binder_stats.obj_created[BINDER_STAT_DEATH]++;
1989                                 INIT_LIST_HEAD(&death->work.entry);
1990                                 death->cookie = cookie;
1991                                 ref->death = death;
1992                                 if (ref->node->proc == NULL) {
1993                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
1994                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1995                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
1996                                         } else {
1997                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
1998                                                 wake_up_interruptible(&proc->wait);
1999                                         }
2000                                 }
2001                         } else {
2002                                 if (ref->death == NULL) {
2003                                         binder_user_error("binder: %d:%"
2004                                                 "d BC_CLEAR_DEATH_NOTIFI"
2005                                                 "CATION death notificat"
2006                                                 "ion not active\n",
2007                                                 proc->pid, thread->pid);
2008                                         break;
2009                                 }
2010                                 death = ref->death;
2011                                 if (death->cookie != cookie) {
2012                                         binder_user_error("binder: %d:%"
2013                                                 "d BC_CLEAR_DEATH_NOTIFI"
2014                                                 "CATION death notificat"
2015                                                 "ion cookie mismatch "
2016                                                 "%p != %p\n",
2017                                                 proc->pid, thread->pid,
2018                                                 death->cookie, cookie);
2019                                         break;
2020                                 }
2021                                 ref->death = NULL;
2022                                 if (list_empty(&death->work.entry)) {
2023                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2024                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2025                                                 list_add_tail(&death->work.entry, &thread->todo);
2026                                         } else {
2027                                                 list_add_tail(&death->work.entry, &proc->todo);
2028                                                 wake_up_interruptible(&proc->wait);
2029                                         }
2030                                 } else {
2031                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2032                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2033                                 }
2034                         }
2035                 } break;
2036                 case BC_DEAD_BINDER_DONE: {
2037                         struct binder_work *w;
2038                         void __user *cookie;
2039                         struct binder_ref_death *death = NULL;
2040                         if (get_user(cookie, (void __user * __user *)ptr))
2041                                 return -EFAULT;
2042
2043                         ptr += sizeof(void *);
2044                         list_for_each_entry(w, &proc->delivered_death, entry) {
2045                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2046                                 if (tmp_death->cookie == cookie) {
2047                                         death = tmp_death;
2048                                         break;
2049                                 }
2050                         }
2051                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
2052                                 printk(KERN_INFO "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2053                                        proc->pid, thread->pid, cookie, death);
2054                         if (death == NULL) {
2055                                 binder_user_error("binder: %d:%d BC_DEAD"
2056                                         "_BINDER_DONE %p not found\n",
2057                                         proc->pid, thread->pid, cookie);
2058                                 break;
2059                         }
2060
2061                         list_del_init(&death->work.entry);
2062                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2063                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2064                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2065                                         list_add_tail(&death->work.entry, &thread->todo);
2066                                 } else {
2067                                         list_add_tail(&death->work.entry, &proc->todo);
2068                                         wake_up_interruptible(&proc->wait);
2069                                 }
2070                         }
2071                 } break;
2072
2073                 default:
2074                         printk(KERN_ERR "binder: %d:%d unknown command %d\n", proc->pid, thread->pid, cmd);
2075                         return -EINVAL;
2076                 }
2077                 *consumed = ptr - buffer;
2078         }
2079         return 0;
2080 }
2081
2082 void
2083 binder_stat_br(struct binder_proc *proc, struct binder_thread *thread, uint32_t cmd)
2084 {
2085         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2086                 binder_stats.br[_IOC_NR(cmd)]++;
2087                 proc->stats.br[_IOC_NR(cmd)]++;
2088                 thread->stats.br[_IOC_NR(cmd)]++;
2089         }
2090 }
2091
2092 static int
2093 binder_has_proc_work(struct binder_proc *proc, struct binder_thread *thread)
2094 {
2095         return !list_empty(&proc->todo) || (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2096 }
2097
2098 static int
2099 binder_has_thread_work(struct binder_thread *thread)
2100 {
2101         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2102                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2103 }
2104
2105 static int
2106 binder_thread_read(struct binder_proc *proc, struct binder_thread *thread,
2107         void  __user *buffer, int size, signed long *consumed, int non_block)
2108 {
2109         void __user *ptr = buffer + *consumed;
2110         void __user *end = buffer + size;
2111
2112         int ret = 0;
2113         int wait_for_proc_work;
2114
2115         if (*consumed == 0) {
2116                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2117                         return -EFAULT;
2118                 ptr += sizeof(uint32_t);
2119         }
2120
2121 retry:
2122         wait_for_proc_work = thread->transaction_stack == NULL && list_empty(&thread->todo);
2123
2124         if (thread->return_error != BR_OK && ptr < end) {
2125                 if (thread->return_error2 != BR_OK) {
2126                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2127                                 return -EFAULT;
2128                         ptr += sizeof(uint32_t);
2129                         if (ptr == end)
2130                                 goto done;
2131                         thread->return_error2 = BR_OK;
2132                 }
2133                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2134                         return -EFAULT;
2135                 ptr += sizeof(uint32_t);
2136                 thread->return_error = BR_OK;
2137                 goto done;
2138         }
2139
2140
2141         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2142         if (wait_for_proc_work)
2143                 proc->ready_threads++;
2144         mutex_unlock(&binder_lock);
2145         if (wait_for_proc_work) {
2146                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2147                                         BINDER_LOOPER_STATE_ENTERED))) {
2148                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
2149                                 "for process work before calling BC_REGISTER_"
2150                                 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2151                                 proc->pid, thread->pid, thread->looper);
2152                         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2153                 }
2154                 binder_set_nice(proc->default_priority);
2155                 if (non_block) {
2156                         if (!binder_has_proc_work(proc, thread))
2157                                 ret = -EAGAIN;
2158                 } else
2159                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2160         } else {
2161                 if (non_block) {
2162                         if (!binder_has_thread_work(thread))
2163                                 ret = -EAGAIN;
2164                 } else
2165                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2166         }
2167         mutex_lock(&binder_lock);
2168         if (wait_for_proc_work)
2169                 proc->ready_threads--;
2170         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2171
2172         if (ret)
2173                 return ret;
2174
2175         while (1) {
2176                 uint32_t cmd;
2177                 struct binder_transaction_data tr;
2178                 struct binder_work *w;
2179                 struct binder_transaction *t = NULL;
2180
2181                 if (!list_empty(&thread->todo))
2182                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2183                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2184                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2185                 else {
2186                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2187                                 goto retry;
2188                         break;
2189                 }
2190
2191                 if (end - ptr < sizeof(tr) + 4)
2192                         break;
2193
2194                 switch (w->type) {
2195                 case BINDER_WORK_TRANSACTION: {
2196                         t = container_of(w, struct binder_transaction, work);
2197                 } break;
2198                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2199                         cmd = BR_TRANSACTION_COMPLETE;
2200                         if (put_user(cmd, (uint32_t __user *)ptr))
2201                                 return -EFAULT;
2202                         ptr += sizeof(uint32_t);
2203
2204                         binder_stat_br(proc, thread, cmd);
2205                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION_COMPLETE)
2206                                 printk(KERN_INFO "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2207                                        proc->pid, thread->pid);
2208
2209                         list_del(&w->entry);
2210                         kfree(w);
2211                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2212                 } break;
2213                 case BINDER_WORK_NODE: {
2214                         struct binder_node *node = container_of(w, struct binder_node, work);
2215                         uint32_t cmd = BR_NOOP;
2216                         const char *cmd_name;
2217                         int strong = node->internal_strong_refs || node->local_strong_refs;
2218                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2219                         if (weak && !node->has_weak_ref) {
2220                                 cmd = BR_INCREFS;
2221                                 cmd_name = "BR_INCREFS";
2222                                 node->has_weak_ref = 1;
2223                                 node->pending_weak_ref = 1;
2224                                 node->local_weak_refs++;
2225                         } else if (strong && !node->has_strong_ref) {
2226                                 cmd = BR_ACQUIRE;
2227                                 cmd_name = "BR_ACQUIRE";
2228                                 node->has_strong_ref = 1;
2229                                 node->pending_strong_ref = 1;
2230                                 node->local_strong_refs++;
2231                         } else if (!strong && node->has_strong_ref) {
2232                                 cmd = BR_RELEASE;
2233                                 cmd_name = "BR_RELEASE";
2234                                 node->has_strong_ref = 0;
2235                         } else if (!weak && node->has_weak_ref) {
2236                                 cmd = BR_DECREFS;
2237                                 cmd_name = "BR_DECREFS";
2238                                 node->has_weak_ref = 0;
2239                         }
2240                         if (cmd != BR_NOOP) {
2241                                 if (put_user(cmd, (uint32_t __user *)ptr))
2242                                         return -EFAULT;
2243                                 ptr += sizeof(uint32_t);
2244                                 if (put_user(node->ptr, (void * __user *)ptr))
2245                                         return -EFAULT;
2246                                 ptr += sizeof(void *);
2247                                 if (put_user(node->cookie, (void * __user *)ptr))
2248                                         return -EFAULT;
2249                                 ptr += sizeof(void *);
2250
2251                                 binder_stat_br(proc, thread, cmd);
2252                                 if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
2253                                         printk(KERN_INFO "binder: %d:%d %s %d u%p c%p\n",
2254                                                proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2255                         } else {
2256                                 list_del_init(&w->entry);
2257                                 if (!weak && !strong) {
2258                                         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
2259                                                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p deleted\n",
2260                                                        proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
2261                                         rb_erase(&node->rb_node, &proc->nodes);
2262                                         kfree(node);
2263                                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2264                                 } else {
2265                                         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
2266                                                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p state unchanged\n",
2267                                                        proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
2268                                 }
2269                         }
2270                 } break;
2271                 case BINDER_WORK_DEAD_BINDER:
2272                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2273                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2274                         struct binder_ref_death *death = container_of(w, struct binder_ref_death, work);
2275                         uint32_t cmd;
2276                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2277                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2278                         else
2279                                 cmd = BR_DEAD_BINDER;
2280                         if (put_user(cmd, (uint32_t __user *)ptr))
2281                                 return -EFAULT;
2282                         ptr += sizeof(uint32_t);
2283                         if (put_user(death->cookie, (void * __user *)ptr))
2284                                 return -EFAULT;
2285                         ptr += sizeof(void *);
2286                         if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
2287                                 printk(KERN_INFO "binder: %d:%d %s %p\n",
2288                                        proc->pid, thread->pid,
2289                                        cmd == BR_DEAD_BINDER ?
2290                                        "BR_DEAD_BINDER" :
2291                                        "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2292                                        death->cookie);
2293
2294                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2295                                 list_del(&w->entry);
2296                                 kfree(death);
2297                                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
2298                         } else
2299                                 list_move(&w->entry, &proc->delivered_death);
2300                         if (cmd == BR_DEAD_BINDER)
2301                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2302                 } break;
2303                 }
2304
2305                 if (!t)
2306                         continue;
2307
2308                 BUG_ON(t->buffer == NULL);
2309                 if (t->buffer->target_node) {
2310                         struct binder_node *target_node = t->buffer->target_node;
2311                         tr.target.ptr = target_node->ptr;
2312                         tr.cookie =  target_node->cookie;
2313                         t->saved_priority = task_nice(current);
2314                         if (t->priority < target_node->min_priority &&
2315                             !(t->flags & TF_ONE_WAY))
2316                                 binder_set_nice(t->priority);
2317                         else if (!(t->flags & TF_ONE_WAY) ||
2318                                  t->saved_priority > target_node->min_priority)
2319                                 binder_set_nice(target_node->min_priority);
2320                         cmd = BR_TRANSACTION;
2321                 } else {
2322                         tr.target.ptr = NULL;
2323                         tr.cookie = NULL;
2324                         cmd = BR_REPLY;
2325                 }
2326                 tr.code = t->code;
2327                 tr.flags = t->flags;
2328                 tr.sender_euid = t->sender_euid;
2329
2330                 if (t->from) {
2331                         struct task_struct *sender = t->from->proc->tsk;
2332                         tr.sender_pid = task_tgid_nr_ns(sender, current->nsproxy->pid_ns);
2333                 } else {
2334                         tr.sender_pid = 0;
2335                 }
2336
2337                 tr.data_size = t->buffer->data_size;
2338                 tr.offsets_size = t->buffer->offsets_size;
2339                 tr.data.ptr.buffer = (void *)((void *)t->buffer->data + proc->user_buffer_offset);
2340                 tr.data.ptr.offsets = tr.data.ptr.buffer + ALIGN(t->buffer->data_size, sizeof(void *));
2341
2342                 if (put_user(cmd, (uint32_t __user *)ptr))
2343                         return -EFAULT;
2344                 ptr += sizeof(uint32_t);
2345                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2346                         return -EFAULT;
2347                 ptr += sizeof(tr);
2348
2349                 binder_stat_br(proc, thread, cmd);
2350                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
2351                         printk(KERN_INFO "binder: %d:%d %s %d %d:%d, cmd %d"
2352                                 "size %zd-%zd ptr %p-%p\n",
2353                                proc->pid, thread->pid,
2354                                (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" : "BR_REPLY",
2355                                t->debug_id, t->from ? t->from->proc->pid : 0,
2356                                t->from ? t->from->pid : 0, cmd,
2357                                t->buffer->data_size, t->buffer->offsets_size,
2358                                tr.data.ptr.buffer, tr.data.ptr.offsets);
2359
2360                 list_del(&t->work.entry);
2361                 t->buffer->allow_user_free = 1;
2362                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2363                         t->to_parent = thread->transaction_stack;
2364                         t->to_thread = thread;
2365                         thread->transaction_stack = t;
2366                 } else {
2367                         t->buffer->transaction = NULL;
2368                         kfree(t);
2369                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
2370                 }
2371                 break;
2372         }
2373
2374 done:
2375
2376         *consumed = ptr - buffer;
2377         if (proc->requested_threads + proc->ready_threads == 0 &&
2378             proc->requested_threads_started < proc->max_threads &&
2379             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2380              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2381              /*spawn a new thread if we leave this out */) {
2382                 proc->requested_threads++;
2383                 if (binder_debug_mask & BINDER_DEBUG_THREADS)
2384                         printk(KERN_INFO "binder: %d:%d BR_SPAWN_LOOPER\n",
2385                                proc->pid, thread->pid);
2386                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2387                         return -EFAULT;
2388         }
2389         return 0;
2390 }
2391
2392 static void binder_release_work(struct list_head *list)
2393 {
2394         struct binder_work *w;
2395         while (!list_empty(list)) {
2396                 w = list_first_entry(list, struct binder_work, entry);
2397                 list_del_init(&w->entry);
2398                 switch (w->type) {
2399                 case BINDER_WORK_TRANSACTION: {
2400                         struct binder_transaction *t = container_of(w, struct binder_transaction, work);
2401                         if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
2402                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2403                 } break;
2404                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2405                         kfree(w);
2406                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2407                 } break;
2408                 default:
2409                         break;
2410                 }
2411         }
2412
2413 }
2414
2415 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2416 {
2417         struct binder_thread *thread = NULL;
2418         struct rb_node *parent = NULL;
2419         struct rb_node **p = &proc->threads.rb_node;
2420
2421         while (*p) {
2422                 parent = *p;
2423                 thread = rb_entry(parent, struct binder_thread, rb_node);
2424
2425                 if (current->pid < thread->pid)
2426                         p = &(*p)->rb_left;
2427                 else if (current->pid > thread->pid)
2428                         p = &(*p)->rb_right;
2429                 else
2430                         break;
2431         }
2432         if (*p == NULL) {
2433                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2434                 if (thread == NULL)
2435                         return NULL;
2436                 binder_stats.obj_created[BINDER_STAT_THREAD]++;
2437                 thread->proc = proc;
2438                 thread->pid = current->pid;
2439                 init_waitqueue_head(&thread->wait);
2440                 INIT_LIST_HEAD(&thread->todo);
2441                 rb_link_node(&thread->rb_node, parent, p);
2442                 rb_insert_color(&thread->rb_node, &proc->threads);
2443                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2444                 thread->return_error = BR_OK;
2445                 thread->return_error2 = BR_OK;
2446         }
2447         return thread;
2448 }
2449
2450 static int binder_free_thread(struct binder_proc *proc, struct binder_thread *thread)
2451 {
2452         struct binder_transaction *t;
2453         struct binder_transaction *send_reply = NULL;
2454         int active_transactions = 0;
2455
2456         rb_erase(&thread->rb_node, &proc->threads);
2457         t = thread->transaction_stack;
2458         if (t && t->to_thread == thread)
2459                 send_reply = t;
2460         while (t) {
2461                 active_transactions++;
2462                 if (binder_debug_mask & BINDER_DEBUG_DEAD_TRANSACTION)
2463                         printk(KERN_INFO "binder: release %d:%d transaction %d %s, still active\n",
2464                                proc->pid, thread->pid, t->debug_id, (t->to_thread == thread) ? "in" : "out");
2465                 if (t->to_thread == thread) {
2466                         t->to_proc = NULL;
2467                         t->to_thread = NULL;
2468                         if (t->buffer) {
2469                                 t->buffer->transaction = NULL;
2470                                 t->buffer = NULL;
2471                         }
2472                         t = t->to_parent;
2473                 } else if (t->from == thread) {
2474                         t->from = NULL;
2475                         t = t->from_parent;
2476                 } else
2477                         BUG();
2478         }
2479         if (send_reply)
2480                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2481         binder_release_work(&thread->todo);
2482         kfree(thread);
2483         binder_stats.obj_deleted[BINDER_STAT_THREAD]++;
2484         return active_transactions;
2485 }
2486
2487 static unsigned int binder_poll(struct file *filp, struct poll_table_struct *wait)
2488 {
2489         struct binder_proc *proc = filp->private_data;
2490         struct binder_thread *thread = NULL;
2491         int wait_for_proc_work;
2492
2493         mutex_lock(&binder_lock);
2494         thread = binder_get_thread(proc);
2495
2496         wait_for_proc_work = thread->transaction_stack == NULL &&
2497                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2498         mutex_unlock(&binder_lock);
2499
2500         if (wait_for_proc_work) {
2501                 if (binder_has_proc_work(proc, thread))
2502                         return POLLIN;
2503                 poll_wait(filp, &proc->wait, wait);
2504                 if (binder_has_proc_work(proc, thread))
2505                         return POLLIN;
2506         } else {
2507                 if (binder_has_thread_work(thread))
2508                         return POLLIN;
2509                 poll_wait(filp, &thread->wait, wait);
2510                 if (binder_has_thread_work(thread))
2511                         return POLLIN;
2512         }
2513         return 0;
2514 }
2515
2516 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2517 {
2518         int ret;
2519         struct binder_proc *proc = filp->private_data;
2520         struct binder_thread *thread;
2521         unsigned int size = _IOC_SIZE(cmd);
2522         void __user *ubuf = (void __user *)arg;
2523
2524         /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2525
2526         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2527         if (ret)
2528                 return ret;
2529
2530         mutex_lock(&binder_lock);
2531         thread = binder_get_thread(proc);
2532         if (thread == NULL) {
2533                 ret = -ENOMEM;
2534                 goto err;
2535         }
2536
2537         switch (cmd) {
2538         case BINDER_WRITE_READ: {
2539                 struct binder_write_read bwr;
2540                 if (size != sizeof(struct binder_write_read)) {
2541                         ret = -EINVAL;
2542                         goto err;
2543                 }
2544                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2545                         ret = -EFAULT;
2546                         goto err;
2547                 }
2548                 if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
2549                         printk(KERN_INFO "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2550                                proc->pid, thread->pid, bwr.write_size, bwr.write_buffer, bwr.read_size, bwr.read_buffer);
2551                 if (bwr.write_size > 0) {
2552                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2553                         if (ret < 0) {
2554                                 bwr.read_consumed = 0;
2555                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2556                                         ret = -EFAULT;
2557                                 goto err;
2558                         }
2559                 }
2560                 if (bwr.read_size > 0) {
2561                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2562                         if (!list_empty(&proc->todo))
2563                                 wake_up_interruptible(&proc->wait);
2564                         if (ret < 0) {
2565                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2566                                         ret = -EFAULT;
2567                                 goto err;
2568                         }
2569                 }
2570                 if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
2571                         printk(KERN_INFO "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2572                                proc->pid, thread->pid, bwr.write_consumed, bwr.write_size, bwr.read_consumed, bwr.read_size);
2573                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2574                         ret = -EFAULT;
2575                         goto err;
2576                 }
2577                 break;
2578         }
2579         case BINDER_SET_MAX_THREADS:
2580                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2581                         ret = -EINVAL;
2582                         goto err;
2583                 }
2584                 break;
2585         case BINDER_SET_CONTEXT_MGR:
2586                 if (binder_context_mgr_node != NULL) {
2587                         printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set\n");
2588                         ret = -EBUSY;
2589                         goto err;
2590                 }
2591                 if (binder_context_mgr_uid != -1) {
2592                         if (binder_context_mgr_uid != current->cred->euid) {
2593                                 printk(KERN_ERR "binder: BINDER_SET_"
2594                                        "CONTEXT_MGR bad uid %d != %d\n",
2595                                        current->cred->euid,
2596                                        binder_context_mgr_uid);
2597                                 ret = -EPERM;
2598                                 goto err;
2599                         }
2600                 } else
2601                         binder_context_mgr_uid = current->cred->euid;
2602                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2603                 if (binder_context_mgr_node == NULL) {
2604                         ret = -ENOMEM;
2605                         goto err;
2606                 }
2607                 binder_context_mgr_node->local_weak_refs++;
2608                 binder_context_mgr_node->local_strong_refs++;
2609                 binder_context_mgr_node->has_strong_ref = 1;
2610                 binder_context_mgr_node->has_weak_ref = 1;
2611                 break;
2612         case BINDER_THREAD_EXIT:
2613                 if (binder_debug_mask & BINDER_DEBUG_THREADS)
2614                         printk(KERN_INFO "binder: %d:%d exit\n",
2615                                proc->pid, thread->pid);
2616                 binder_free_thread(proc, thread);
2617                 thread = NULL;
2618                 break;
2619         case BINDER_VERSION:
2620                 if (size != sizeof(struct binder_version)) {
2621                         ret = -EINVAL;
2622                         goto err;
2623                 }
2624                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2625                         ret = -EINVAL;
2626                         goto err;
2627                 }
2628                 break;
2629         default:
2630                 ret = -EINVAL;
2631                 goto err;
2632         }
2633         ret = 0;
2634 err:
2635         if (thread)
2636                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2637         mutex_unlock(&binder_lock);
2638         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2639         if (ret && ret != -ERESTARTSYS)
2640                 printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2641         return ret;
2642 }
2643
2644 static void binder_vma_open(struct vm_area_struct *vma)
2645 {
2646         struct binder_proc *proc = vma->vm_private_data;
2647         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2648                 printk(KERN_INFO
2649                         "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2650                         proc->pid, vma->vm_start, vma->vm_end,
2651                         (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2652                         (unsigned long)pgprot_val(vma->vm_page_prot));
2653         dump_stack();
2654 }
2655 static void binder_vma_close(struct vm_area_struct *vma)
2656 {
2657         struct binder_proc *proc = vma->vm_private_data;
2658         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2659                 printk(KERN_INFO
2660                         "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2661                         proc->pid, vma->vm_start, vma->vm_end,
2662                         (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2663                         (unsigned long)pgprot_val(vma->vm_page_prot));
2664         proc->vma = NULL;
2665 }
2666
2667 static struct vm_operations_struct binder_vm_ops = {
2668         .open = binder_vma_open,
2669         .close = binder_vma_close,
2670 };
2671
2672 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2673 {
2674         int ret;
2675         struct vm_struct *area;
2676         struct binder_proc *proc = filp->private_data;
2677         const char *failure_string;
2678         struct binder_buffer *buffer;
2679
2680         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2681                 vma->vm_end = vma->vm_start + SZ_4M;
2682
2683         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2684                 printk(KERN_INFO
2685                         "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2686                         proc->pid, vma->vm_start, vma->vm_end,
2687                         (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2688                         (unsigned long)pgprot_val(vma->vm_page_prot));
2689
2690         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2691                 ret = -EPERM;
2692                 failure_string = "bad vm_flags";
2693                 goto err_bad_arg;
2694         }
2695         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2696
2697         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2698         if (area == NULL) {
2699                 ret = -ENOMEM;
2700                 failure_string = "get_vm_area";
2701                 goto err_get_vm_area_failed;
2702         }
2703         proc->buffer = area->addr;
2704         proc->user_buffer_offset = vma->vm_start - (size_t)proc->buffer;
2705
2706 #ifdef CONFIG_CPU_CACHE_VIPT
2707         if (cache_is_vipt_aliasing()) {
2708                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2709                         printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2710                         vma->vm_start += PAGE_SIZE;
2711                 }
2712         }
2713 #endif
2714         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2715         if (proc->pages == NULL) {
2716                 ret = -ENOMEM;
2717                 failure_string = "alloc page array";
2718                 goto err_alloc_pages_failed;
2719         }
2720         proc->buffer_size = vma->vm_end - vma->vm_start;
2721
2722         vma->vm_ops = &binder_vm_ops;
2723         vma->vm_private_data = proc;
2724
2725         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2726                 ret = -ENOMEM;
2727                 failure_string = "alloc small buf";
2728                 goto err_alloc_small_buf_failed;
2729         }
2730         buffer = proc->buffer;
2731         INIT_LIST_HEAD(&proc->buffers);
2732         list_add(&buffer->entry, &proc->buffers);
2733         buffer->free = 1;
2734         binder_insert_free_buffer(proc, buffer);
2735         proc->free_async_space = proc->buffer_size / 2;
2736         barrier();
2737         proc->vma = vma;
2738
2739         /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2740         return 0;
2741
2742 err_alloc_small_buf_failed:
2743         kfree(proc->pages);
2744 err_alloc_pages_failed:
2745         vfree(proc->buffer);
2746 err_get_vm_area_failed:
2747         mutex_unlock(&binder_lock);
2748 err_bad_arg:
2749         printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n", proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2750         return ret;
2751 }
2752
2753 static int binder_open(struct inode *nodp, struct file *filp)
2754 {
2755         struct binder_proc *proc;
2756
2757         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2758                 printk(KERN_INFO "binder_open: %d:%d\n", current->group_leader->pid, current->pid);
2759
2760         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2761         if (proc == NULL)
2762                 return -ENOMEM;
2763         get_task_struct(current);
2764         proc->tsk = current;
2765         INIT_LIST_HEAD(&proc->todo);
2766         init_waitqueue_head(&proc->wait);
2767         proc->default_priority = task_nice(current);
2768         mutex_lock(&binder_lock);
2769         binder_stats.obj_created[BINDER_STAT_PROC]++;
2770         hlist_add_head(&proc->proc_node, &binder_procs);
2771         proc->pid = current->group_leader->pid;
2772         INIT_LIST_HEAD(&proc->delivered_death);
2773         filp->private_data = proc;
2774         mutex_unlock(&binder_lock);
2775
2776         if (binder_proc_dir_entry_proc) {
2777                 char strbuf[11];
2778                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2779                 create_proc_read_entry(strbuf, S_IRUGO, binder_proc_dir_entry_proc, binder_read_proc_proc, proc);
2780         }
2781
2782         return 0;
2783 }
2784
2785 static int binder_flush(struct file *filp, fl_owner_t id)
2786 {
2787         struct rb_node *n;
2788         struct binder_proc *proc = filp->private_data;
2789         int wake_count = 0;
2790
2791         mutex_lock(&binder_lock);
2792         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2793                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2794                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2795                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2796                         wake_up_interruptible(&thread->wait);
2797                         wake_count++;
2798                 }
2799         }
2800         wake_up_interruptible_all(&proc->wait);
2801         mutex_unlock(&binder_lock);
2802
2803         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2804                 printk(KERN_INFO "binder_flush: %d woke %d threads\n", proc->pid, wake_count);
2805
2806         return 0;
2807 }
2808
2809 static int binder_release(struct inode *nodp, struct file *filp)
2810 {
2811         struct hlist_node *pos;
2812         struct binder_transaction *t;
2813         struct rb_node *n;
2814         struct binder_proc *proc = filp->private_data;
2815         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2816
2817         if (binder_proc_dir_entry_proc) {
2818                 char strbuf[11];
2819                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2820                 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2821         }
2822         mutex_lock(&binder_lock);
2823         hlist_del(&proc->proc_node);
2824         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2825                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
2826                         printk(KERN_INFO "binder_release: %d context_mgr_node gone\n", proc->pid);
2827                 binder_context_mgr_node = NULL;
2828         }
2829
2830         threads = 0;
2831         active_transactions = 0;
2832         while ((n = rb_first(&proc->threads))) {
2833                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2834                 threads++;
2835                 active_transactions += binder_free_thread(proc, thread);
2836         }
2837         nodes = 0;
2838         incoming_refs = 0;
2839         while ((n = rb_first(&proc->nodes))) {
2840                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2841
2842                 nodes++;
2843                 rb_erase(&node->rb_node, &proc->nodes);
2844                 list_del_init(&node->work.entry);
2845                 if (hlist_empty(&node->refs)) {
2846                         kfree(node);
2847                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2848                 } else {
2849                         struct binder_ref *ref;
2850                         int death = 0;
2851
2852                         node->proc = NULL;
2853                         node->local_strong_refs = 0;
2854                         node->local_weak_refs = 0;
2855                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2856
2857                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2858                                 incoming_refs++;
2859                                 if (ref->death) {
2860                                         death++;
2861                                         if (list_empty(&ref->death->work.entry)) {
2862                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2863                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2864                                                 wake_up_interruptible(&ref->proc->wait);
2865                                         } else
2866                                                 BUG();
2867                                 }
2868                         }
2869                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
2870                                 printk(KERN_INFO "binder: node %d now dead, refs %d, death %d\n", node->debug_id, incoming_refs, death);
2871                 }
2872         }
2873         outgoing_refs = 0;
2874         while ((n = rb_first(&proc->refs_by_desc))) {
2875                 struct binder_ref *ref = rb_entry(n, struct binder_ref, rb_node_desc);
2876                 outgoing_refs++;
2877                 binder_delete_ref(ref);
2878         }
2879         binder_release_work(&proc->todo);
2880         buffers = 0;
2881
2882         while ((n = rb_first(&proc->allocated_buffers))) {
2883                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer, rb_node);
2884                 t = buffer->transaction;
2885                 if (t) {
2886                         t->buffer = NULL;
2887                         buffer->transaction = NULL;
2888                         printk(KERN_ERR "binder: release proc %d, transaction %d, not freed\n", proc->pid, t->debug_id);
2889                         /*BUG();*/
2890                 }
2891                 binder_free_buf(proc, buffer);
2892                 buffers++;
2893         }
2894
2895         binder_stats.obj_deleted[BINDER_STAT_PROC]++;
2896         mutex_unlock(&binder_lock);
2897
2898         page_count = 0;
2899         if (proc->pages) {
2900                 int i;
2901                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
2902                         if (proc->pages[i]) {
2903                                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
2904                                         printk(KERN_INFO "binder_release: %d: page %d at %p not freed\n", proc->pid, i, proc->buffer + i * PAGE_SIZE);
2905                                 __free_page(proc->pages[i]);
2906                                 page_count++;
2907                         }
2908                 }
2909                 kfree(proc->pages);
2910                 vfree(proc->buffer);
2911         }
2912
2913         put_task_struct(proc->tsk);
2914
2915         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2916                 printk(KERN_INFO "binder_release: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
2917                        proc->pid, threads, nodes, incoming_refs, outgoing_refs, active_transactions, buffers, page_count);
2918
2919         kfree(proc);
2920         return 0;
2921 }
2922
2923 static char *print_binder_transaction(char *buf, char *end, const char *prefix, struct binder_transaction *t)
2924 {
2925         buf += snprintf(buf, end - buf, "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
2926                         prefix, t->debug_id, t, t->from ? t->from->proc->pid : 0,
2927                         t->from ? t->from->pid : 0,
2928                         t->to_proc ? t->to_proc->pid : 0,
2929                         t->to_thread ? t->to_thread->pid : 0,
2930                         t->code, t->flags, t->priority, t->need_reply);
2931         if (buf >= end)
2932                 return buf;
2933         if (t->buffer == NULL) {
2934                 buf += snprintf(buf, end - buf, " buffer free\n");
2935                 return buf;
2936         }
2937         if (t->buffer->target_node) {
2938                 buf += snprintf(buf, end - buf, " node %d",
2939                                 t->buffer->target_node->debug_id);
2940                 if (buf >= end)
2941                         return buf;
2942         }
2943         buf += snprintf(buf, end - buf, " size %zd:%zd data %p\n",
2944                         t->buffer->data_size, t->buffer->offsets_size,
2945                         t->buffer->data);
2946         return buf;
2947 }
2948
2949 static char *print_binder_buffer(char *buf, char *end, const char *prefix, struct binder_buffer *buffer)
2950 {
2951         buf += snprintf(buf, end - buf, "%s %d: %p size %zd:%zd %s\n",
2952                         prefix, buffer->debug_id, buffer->data,
2953                         buffer->data_size, buffer->offsets_size,
2954                         buffer->transaction ? "active" : "delivered");
2955         return buf;
2956 }
2957
2958 static char *print_binder_work(char *buf, char *end, const char *prefix,
2959         const char *transaction_prefix, struct binder_work *w)
2960 {
2961         struct binder_node *node;
2962         struct binder_transaction *t;
2963
2964         switch (w->type) {
2965         case BINDER_WORK_TRANSACTION:
2966                 t = container_of(w, struct binder_transaction, work);
2967                 buf = print_binder_transaction(buf, end, transaction_prefix, t);
2968                 break;
2969         case BINDER_WORK_TRANSACTION_COMPLETE:
2970                 buf += snprintf(buf, end - buf,
2971                                 "%stransaction complete\n", prefix);
2972                 break;
2973         case BINDER_WORK_NODE:
2974                 node = container_of(w, struct binder_node, work);
2975                 buf += snprintf(buf, end - buf, "%snode work %d: u%p c%p\n",
2976                                 prefix, node->debug_id, node->ptr, node->cookie);
2977                 break;
2978         case BINDER_WORK_DEAD_BINDER:
2979                 buf += snprintf(buf, end - buf, "%shas dead binder\n", prefix);
2980                 break;
2981         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2982                 buf += snprintf(buf, end - buf,
2983                                 "%shas cleared dead binder\n", prefix);
2984                 break;
2985         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
2986                 buf += snprintf(buf, end - buf,
2987                                 "%shas cleared death notification\n", prefix);
2988                 break;
2989         default:
2990                 buf += snprintf(buf, end - buf, "%sunknown work: type %d\n",
2991                                 prefix, w->type);
2992                 break;
2993         }
2994         return buf;
2995 }
2996
2997 static char *print_binder_thread(char *buf, char *end, struct binder_thread *thread, int print_always)
2998 {
2999         struct binder_transaction *t;
3000         struct binder_work *w;
3001         char *start_buf = buf;
3002         char *header_buf;
3003
3004         buf += snprintf(buf, end - buf, "  thread %d: l %02x\n", thread->pid, thread->looper);
3005         header_buf = buf;
3006         t = thread->transaction_stack;
3007         while (t) {
3008                 if (buf >= end)
3009                         break;
3010                 if (t->from == thread) {
3011                         buf = print_binder_transaction(buf, end, "    outgoing transaction", t);
3012                         t = t->from_parent;
3013                 } else if (t->to_thread == thread) {
3014                         buf = print_binder_transaction(buf, end, "    incoming transaction", t);
3015                         t = t->to_parent;
3016                 } else {
3017                         buf = print_binder_transaction(buf, end, "    bad transaction", t);
3018                         t = NULL;
3019                 }
3020         }
3021         list_for_each_entry(w, &thread->todo, entry) {
3022                 if (buf >= end)
3023                         break;
3024                 buf = print_binder_work(buf, end, "    ",
3025                                         "    pending transaction", w);
3026         }
3027         if (!print_always && buf == header_buf)
3028                 buf = start_buf;
3029         return buf;
3030 }
3031
3032 static char *print_binder_node(char *buf, char *end, struct binder_node *node)
3033 {
3034         struct binder_ref *ref;
3035         struct hlist_node *pos;
3036         struct binder_work *w;
3037         int count;
3038         count = 0;
3039         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3040                 count++;
3041
3042         buf += snprintf(buf, end - buf, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3043                         node->debug_id, node->ptr, node->cookie,
3044                         node->has_strong_ref, node->has_weak_ref,
3045                         node->local_strong_refs, node->local_weak_refs,
3046                         node->internal_strong_refs, count);
3047         if (buf >= end)
3048                 return buf;
3049         if (count) {
3050                 buf += snprintf(buf, end - buf, " proc");
3051                 if (buf >= end)
3052                         return buf;
3053                 hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
3054                         buf += snprintf(buf, end - buf, " %d", ref->proc->pid);
3055                         if (buf >= end)
3056                                 return buf;
3057                 }
3058         }
3059         buf += snprintf(buf, end - buf, "\n");
3060         list_for_each_entry(w, &node->async_todo, entry) {
3061                 if (buf >= end)
3062                         break;
3063                 buf = print_binder_work(buf, end, "    ",
3064                                         "    pending async transaction", w);
3065         }
3066         return buf;
3067 }
3068
3069 static char *print_binder_ref(char *buf, char *end, struct binder_ref *ref)
3070 {
3071         buf += snprintf(buf, end - buf, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3072                         ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3073                         ref->node->debug_id, ref->strong, ref->weak, ref->death);
3074         return buf;
3075 }
3076
3077 static char *print_binder_proc(char *buf, char *end, struct binder_proc *proc, int print_all)
3078 {
3079         struct binder_work *w;
3080         struct rb_node *n;
3081         char *start_buf = buf;
3082         char *header_buf;
3083
3084         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3085         header_buf = buf;
3086
3087         for (n = rb_first(&proc->threads); n != NULL && buf < end; n = rb_next(n))
3088                 buf = print_binder_thread(buf, end, rb_entry(n, struct binder_thread, rb_node), print_all);
3089         for (n = rb_first(&proc->nodes); n != NULL && buf < end; n = rb_next(n)) {
3090                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
3091                 if (print_all || node->has_async_transaction)
3092                         buf = print_binder_node(buf, end, node);
3093         }
3094         if (print_all) {
3095                 for (n = rb_first(&proc->refs_by_desc); n != NULL && buf < end; n = rb_next(n))
3096                         buf = print_binder_ref(buf, end, rb_entry(n, struct binder_ref, rb_node_desc));
3097         }
3098         for (n = rb_first(&proc->allocated_buffers); n != NULL && buf < end; n = rb_next(n))
3099                 buf = print_binder_buffer(buf, end, "  buffer", rb_entry(n, struct binder_buffer, rb_node));
3100         list_for_each_entry(w, &proc->todo, entry) {
3101                 if (buf >= end)
3102                         break;
3103                 buf = print_binder_work(buf, end, "  ",
3104                                         "  pending transaction", w);
3105         }
3106         list_for_each_entry(w, &proc->delivered_death, entry) {
3107                 if (buf >= end)
3108                         break;
3109                 buf += snprintf(buf, end - buf, "  has delivered dead binder\n");
3110                 break;
3111         }
3112         if (!print_all && buf == header_buf)
3113                 buf = start_buf;
3114         return buf;
3115 }
3116
3117 static const char *binder_return_strings[] = {
3118         "BR_ERROR",
3119         "BR_OK",
3120         "BR_TRANSACTION",
3121         "BR_REPLY",
3122         "BR_ACQUIRE_RESULT",
3123         "BR_DEAD_REPLY",
3124         "BR_TRANSACTION_COMPLETE",
3125         "BR_INCREFS",
3126         "BR_ACQUIRE",
3127         "BR_RELEASE",
3128         "BR_DECREFS",
3129         "BR_ATTEMPT_ACQUIRE",
3130         "BR_NOOP",
3131         "BR_SPAWN_LOOPER",
3132         "BR_FINISHED",
3133         "BR_DEAD_BINDER",
3134         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3135         "BR_FAILED_REPLY"
3136 };
3137
3138 static const char *binder_command_strings[] = {
3139         "BC_TRANSACTION",
3140         "BC_REPLY",
3141         "BC_ACQUIRE_RESULT",
3142         "BC_FREE_BUFFER",
3143         "BC_INCREFS",
3144         "BC_ACQUIRE",
3145         "BC_RELEASE",
3146         "BC_DECREFS",
3147         "BC_INCREFS_DONE",
3148         "BC_ACQUIRE_DONE",
3149         "BC_ATTEMPT_ACQUIRE",
3150         "BC_REGISTER_LOOPER",
3151         "BC_ENTER_LOOPER",
3152         "BC_EXIT_LOOPER",
3153         "BC_REQUEST_DEATH_NOTIFICATION",
3154         "BC_CLEAR_DEATH_NOTIFICATION",
3155         "BC_DEAD_BINDER_DONE"
3156 };
3157
3158 static const char *binder_objstat_strings[] = {
3159         "proc",
3160         "thread",
3161         "node",
3162         "ref",
3163         "death",
3164         "transaction",
3165         "transaction_complete"
3166 };
3167
3168 static char *print_binder_stats(char *buf, char *end, const char *prefix, struct binder_stats *stats)
3169 {
3170         int i;
3171
3172         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) != ARRAY_SIZE(binder_command_strings));
3173         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3174                 if (stats->bc[i])
3175                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3176                                         binder_command_strings[i], stats->bc[i]);
3177                 if (buf >= end)
3178                         return buf;
3179         }
3180
3181         BUILD_BUG_ON(ARRAY_SIZE(stats->br) != ARRAY_SIZE(binder_return_strings));
3182         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3183                 if (stats->br[i])
3184                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3185                                         binder_return_strings[i], stats->br[i]);
3186                 if (buf >= end)
3187                         return buf;
3188         }
3189
3190         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != ARRAY_SIZE(binder_objstat_strings));
3191         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != ARRAY_SIZE(stats->obj_deleted));
3192         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3193                 if (stats->obj_created[i] || stats->obj_deleted[i])
3194                         buf += snprintf(buf, end - buf, "%s%s: active %d total %d\n", prefix,
3195                                         binder_objstat_strings[i],
3196                                         stats->obj_created[i] - stats->obj_deleted[i],
3197                                         stats->obj_created[i]);
3198                 if (buf >= end)
3199                         return buf;
3200         }
3201         return buf;
3202 }
3203
3204 static char *print_binder_proc_stats(char *buf, char *end, struct binder_proc *proc)
3205 {
3206         struct binder_work *w;
3207         struct rb_node *n;
3208         int count, strong, weak;
3209
3210         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3211         if (buf >= end)
3212                 return buf;
3213         count = 0;
3214         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3215                 count++;
3216         buf += snprintf(buf, end - buf, "  threads: %d\n", count);
3217         if (buf >= end)
3218                 return buf;
3219         buf += snprintf(buf, end - buf, "  requested threads: %d+%d/%d\n"
3220                         "  ready threads %d\n"
3221                         "  free async space %zd\n", proc->requested_threads,
3222                         proc->requested_threads_started, proc->max_threads,
3223                         proc->ready_threads, proc->free_async_space);
3224         if (buf >= end)
3225                 return buf;
3226         count = 0;
3227         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3228                 count++;
3229         buf += snprintf(buf, end - buf, "  nodes: %d\n", count);
3230         if (buf >= end)
3231                 return buf;
3232         count = 0;
3233         strong = 0;
3234         weak = 0;
3235         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3236                 struct binder_ref *ref = rb_entry(n, struct binder_ref, rb_node_desc);
3237                 count++;
3238                 strong += ref->strong;
3239                 weak += ref->weak;
3240         }
3241         buf += snprintf(buf, end - buf, "  refs: %d s %d w %d\n", count, strong, weak);
3242         if (buf >= end)
3243                 return buf;
3244
3245         count = 0;
3246         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3247                 count++;
3248         buf += snprintf(buf, end - buf, "  buffers: %d\n", count);
3249         if (buf >= end)
3250                 return buf;
3251
3252         count = 0;
3253         list_for_each_entry(w, &proc->todo, entry) {
3254                 switch (w->type) {
3255                 case BINDER_WORK_TRANSACTION:
3256                         count++;
3257                         break;
3258                 default:
3259                         break;
3260                 }
3261         }
3262         buf += snprintf(buf, end - buf, "  pending transactions: %d\n", count);
3263         if (buf >= end)
3264                 return buf;
3265
3266         buf = print_binder_stats(buf, end, "  ", &proc->stats);
3267
3268         return buf;
3269 }
3270
3271
3272 static int binder_read_proc_state(
3273         char *page, char **start, off_t off, int count, int *eof, void *data)
3274 {
3275         struct binder_proc *proc;
3276         struct hlist_node *pos;
3277         struct binder_node *node;
3278         int len = 0;
3279         char *buf = page;
3280         char *end = page + PAGE_SIZE;
3281         int do_lock = !binder_debug_no_lock;
3282
3283         if (off)
3284                 return 0;
3285
3286         if (do_lock)
3287                 mutex_lock(&binder_lock);
3288
3289         buf += snprintf(buf, end - buf, "binder state:\n");
3290
3291         if (!hlist_empty(&binder_dead_nodes))
3292                 buf += snprintf(buf, end - buf, "dead nodes:\n");
3293         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) {
3294                 if (buf >= end)
3295                         break;
3296                 buf = print_binder_node(buf, end, node);
3297         }
3298
3299         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3300                 if (buf >= end)
3301                         break;
3302                 buf = print_binder_proc(buf, end, proc, 1);
3303         }
3304         if (do_lock)
3305                 mutex_unlock(&binder_lock);
3306         if (buf > page + PAGE_SIZE)
3307                 buf = page + PAGE_SIZE;
3308
3309         *start = page + off;
3310
3311         len = buf - page;
3312         if (len > off)
3313                 len -= off;
3314         else
3315                 len = 0;
3316
3317         return len < count ? len  : count;
3318 }
3319
3320 static int binder_read_proc_stats(
3321         char *page, char **start, off_t off, int count, int *eof, void *data)
3322 {
3323         struct binder_proc *proc;
3324         struct hlist_node *pos;
3325         int len = 0;
3326         char *p = page;
3327         int do_lock = !binder_debug_no_lock;
3328
3329         if (off)
3330                 return 0;
3331
3332         if (do_lock)
3333                 mutex_lock(&binder_lock);
3334
3335         p += snprintf(p, PAGE_SIZE, "binder stats:\n");
3336
3337         p = print_binder_stats(p, page + PAGE_SIZE, "", &binder_stats);
3338
3339         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3340                 if (p >= page + PAGE_SIZE)
3341                         break;
3342                 p = print_binder_proc_stats(p, page + PAGE_SIZE, proc);
3343         }
3344         if (do_lock)
3345                 mutex_unlock(&binder_lock);
3346         if (p > page + PAGE_SIZE)
3347                 p = page + PAGE_SIZE;
3348
3349         *start = page + off;
3350
3351         len = p - page;
3352         if (len > off)
3353                 len -= off;
3354         else
3355                 len = 0;
3356
3357         return len < count ? len  : count;
3358 }
3359
3360 static int binder_read_proc_transactions(
3361         char *page, char **start, off_t off, int count, int *eof, void *data)
3362 {
3363         struct binder_proc *proc;
3364         struct hlist_node *pos;
3365         int len = 0;
3366         char *buf = page;
3367         char *end = page + PAGE_SIZE;
3368         int do_lock = !binder_debug_no_lock;
3369
3370         if (off)
3371                 return 0;
3372
3373         if (do_lock)
3374                 mutex_lock(&binder_lock);
3375
3376         buf += snprintf(buf, end - buf, "binder transactions:\n");
3377         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3378                 if (buf >= end)
3379                         break;
3380                 buf = print_binder_proc(buf, end, proc, 0);
3381         }
3382         if (do_lock)
3383                 mutex_unlock(&binder_lock);
3384         if (buf > page + PAGE_SIZE)
3385                 buf = page + PAGE_SIZE;
3386
3387         *start = page + off;
3388
3389         len = buf - page;
3390         if (len > off)
3391                 len -= off;
3392         else
3393                 len = 0;
3394
3395         return len < count ? len  : count;
3396 }
3397
3398 static int binder_read_proc_proc(
3399         char *page, char **start, off_t off, int count, int *eof, void *data)
3400 {
3401         struct binder_proc *proc = data;
3402         int len = 0;
3403         char *p = page;
3404         int do_lock = !binder_debug_no_lock;
3405
3406         if (off)
3407                 return 0;
3408
3409         if (do_lock)
3410                 mutex_lock(&binder_lock);
3411         p += snprintf(p, PAGE_SIZE, "binder proc state:\n");
3412         p = print_binder_proc(p, page + PAGE_SIZE, proc, 1);
3413         if (do_lock)
3414                 mutex_unlock(&binder_lock);
3415
3416         if (p > page + PAGE_SIZE)
3417                 p = page + PAGE_SIZE;
3418         *start = page + off;
3419
3420         len = p - page;
3421         if (len > off)
3422                 len -= off;
3423         else
3424                 len = 0;
3425
3426         return len < count ? len  : count;
3427 }
3428
3429 static char *print_binder_transaction_log_entry(char *buf, char *end, struct binder_transaction_log_entry *e)
3430 {
3431         buf += snprintf(buf, end - buf, "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3432                         e->debug_id, (e->call_type == 2) ? "reply" :
3433                         ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3434                         e->from_thread, e->to_proc, e->to_thread, e->to_node,
3435                         e->target_handle, e->data_size, e->offsets_size);
3436         return buf;
3437 }
3438
3439 static int binder_read_proc_transaction_log(
3440         char *page, char **start, off_t off, int count, int *eof, void *data)
3441 {
3442         struct binder_transaction_log *log = data;
3443         int len = 0;
3444         int i;
3445         char *buf = page;
3446         char *end = page + PAGE_SIZE;
3447
3448         if (off)
3449                 return 0;
3450
3451         if (log->full) {
3452                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++) {
3453                         if (buf >= end)
3454                                 break;
3455                         buf = print_binder_transaction_log_entry(buf, end, &log->entry[i]);
3456                 }
3457         }
3458         for (i = 0; i < log->next; i++) {
3459                 if (buf >= end)
3460                         break;
3461                 buf = print_binder_transaction_log_entry(buf, end, &log->entry[i]);
3462         }
3463
3464         *start = page + off;
3465
3466         len = buf - page;
3467         if (len > off)
3468                 len -= off;
3469         else
3470                 len = 0;
3471
3472         return len < count ? len  : count;
3473 }
3474
3475 static struct file_operations binder_fops = {
3476         .owner = THIS_MODULE,
3477         .poll = binder_poll,
3478         .unlocked_ioctl = binder_ioctl,
3479         .mmap = binder_mmap,
3480         .open = binder_open,
3481         .flush = binder_flush,
3482         .release = binder_release,
3483 };
3484
3485 static struct miscdevice binder_miscdev = {
3486         .minor = MISC_DYNAMIC_MINOR,
3487         .name = "binder",
3488         .fops = &binder_fops
3489 };
3490
3491 static int __init binder_init(void)
3492 {
3493         int ret;
3494
3495         binder_proc_dir_entry_root = proc_mkdir("binder", NULL);
3496         if (binder_proc_dir_entry_root)
3497                 binder_proc_dir_entry_proc = proc_mkdir("proc", binder_proc_dir_entry_root);
3498         ret = misc_register(&binder_miscdev);
3499         if (binder_proc_dir_entry_root) {
3500                 create_proc_read_entry("state", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_state, NULL);
3501                 create_proc_read_entry("stats", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_stats, NULL);
3502                 create_proc_read_entry("transactions", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transactions, NULL);
3503                 create_proc_read_entry("transaction_log", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transaction_log, &binder_transaction_log);
3504                 create_proc_read_entry("failed_transaction_log", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transaction_log, &binder_transaction_log_failed);
3505         }
3506         return ret;
3507 }
3508
3509 device_initcall(binder_init);
3510
3511 MODULE_LICENSE("GPL v2");