git.oblomov.eu Git - linux-2.6/blob - drivers/staging/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #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 #ifndef __i386__
  58 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE | VM_EXEC)
  59 #else
  60 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  61 #endif
  62
  63 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  64
  65 enum {
  66         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  67         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  68         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  69         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  70         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  71         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
  72         BINDER_DEBUG_READ_WRITE             = 1U << 6,
  73         BINDER_DEBUG_USER_REFS              = 1U << 7,
  74         BINDER_DEBUG_THREADS                = 1U << 8,
  75         BINDER_DEBUG_TRANSACTION            = 1U << 9,
  76         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
  77         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
  78         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
  79         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
  80         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
  81         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
  82 };
  83 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
  84         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
  85 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
  86 static int binder_debug_no_lock;
  87 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
  88 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
  89 static int binder_stop_on_user_error;
  90 static int binder_set_stop_on_user_error(
  91         const char *val, struct kernel_param *kp)
  92 {
  93         int ret;
  94         ret = param_set_int(val, kp);
  95         if (binder_stop_on_user_error < 2)
  96                 wake_up(&binder_user_error_wait);
  97         return ret;
  98 }
  99 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 100         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 101
 102 #define binder_user_error(x...) \
 103         do { \
 104                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 105                         printk(KERN_INFO x); \
 106                 if (binder_stop_on_user_error) \
 107                         binder_stop_on_user_error = 2; \
 108         } while (0)
 109
 110 enum {
 111         BINDER_STAT_PROC,
 112         BINDER_STAT_THREAD,
 113         BINDER_STAT_NODE,
 114         BINDER_STAT_REF,
 115         BINDER_STAT_DEATH,
 116         BINDER_STAT_TRANSACTION,
 117         BINDER_STAT_TRANSACTION_COMPLETE,
 118         BINDER_STAT_COUNT
 119 };
 120
 121 struct binder_stats {
 122         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 123         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 124         int obj_created[BINDER_STAT_COUNT];
 125         int obj_deleted[BINDER_STAT_COUNT];
 126 };
 127
 128 static struct binder_stats binder_stats;
 129
 130 struct binder_transaction_log_entry {
 131         int debug_id;
 132         int call_type;
 133         int from_proc;
 134         int from_thread;
 135         int target_handle;
 136         int to_proc;
 137         int to_thread;
 138         int to_node;
 139         int data_size;
 140         int offsets_size;
 141 };
 142 struct binder_transaction_log {
 143         int next;
 144         int full;
 145         struct binder_transaction_log_entry entry[32];
 146 };
 147 struct binder_transaction_log binder_transaction_log;
 148 struct binder_transaction_log binder_transaction_log_failed;
 149
 150 static struct binder_transaction_log_entry *binder_transaction_log_add(
 151         struct binder_transaction_log *log)
 152 {
 153         struct binder_transaction_log_entry *e;
 154         e = &log->entry[log->next];
 155         memset(e, 0, sizeof(*e));
 156         log->next++;
 157         if (log->next == ARRAY_SIZE(log->entry)) {
 158                 log->next = 0;
 159                 log->full = 1;
 160         }
 161         return e;
 162 }
 163
 164 struct binder_work {
 165         struct list_head entry;
 166         enum {
 167                 BINDER_WORK_TRANSACTION = 1,
 168                 BINDER_WORK_TRANSACTION_COMPLETE,
 169                 BINDER_WORK_NODE,
 170                 BINDER_WORK_DEAD_BINDER,
 171                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 172                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 173         } type;
 174 };
 175
 176 struct binder_node {
 177         int debug_id;
 178         struct binder_work work;
 179         union {
 180                 struct rb_node rb_node;
 181                 struct hlist_node dead_node;
 182         };
 183         struct binder_proc *proc;
 184         struct hlist_head refs;
 185         int internal_strong_refs;
 186         int local_weak_refs;
 187         int local_strong_refs;
 188         void __user *ptr;
 189         void __user *cookie;
 190         unsigned has_strong_ref : 1;
 191         unsigned pending_strong_ref : 1;
 192         unsigned has_weak_ref : 1;
 193         unsigned pending_weak_ref : 1;
 194         unsigned has_async_transaction : 1;
 195         unsigned accept_fds : 1;
 196         int min_priority : 8;
 197         struct list_head async_todo;
 198 };
 199
 200 struct binder_ref_death {
 201         struct binder_work work;
 202         void __user *cookie;
 203 };
 204
 205 struct binder_ref {
 206         /* Lookups needed: */
 207         /*   node + proc => ref (transaction) */
 208         /*   desc + proc => ref (transaction, inc/dec ref) */
 209         /*   node => refs + procs (proc exit) */
 210         int debug_id;
 211         struct rb_node rb_node_desc;
 212         struct rb_node rb_node_node;
 213         struct hlist_node node_entry;
 214         struct binder_proc *proc;
 215         struct binder_node *node;
 216         uint32_t desc;
 217         int strong;
 218         int weak;
 219         struct binder_ref_death *death;
 220 };
 221
 222 struct binder_buffer {
 223         struct list_head entry; /* free and allocated entries by addesss */
 224         struct rb_node rb_node; /* free entry by size or allocated entry */
 225                                 /* by address */
 226         unsigned free : 1;
 227         unsigned allow_user_free : 1;
 228         unsigned async_transaction : 1;
 229         unsigned debug_id : 29;
 230
 231         struct binder_transaction *transaction;
 232
 233         struct binder_node *target_node;
 234         size_t data_size;
 235         size_t offsets_size;
 236         uint8_t data[0];
 237 };
 238
 239 struct binder_proc {
 240         struct hlist_node proc_node;
 241         struct rb_root threads;
 242         struct rb_root nodes;
 243         struct rb_root refs_by_desc;
 244         struct rb_root refs_by_node;
 245         int pid;
 246         struct vm_area_struct *vma;
 247         struct task_struct *tsk;
 248         void *buffer;
 249         size_t user_buffer_offset;
 250
 251         struct list_head buffers;
 252         struct rb_root free_buffers;
 253         struct rb_root allocated_buffers;
 254         size_t free_async_space;
 255
 256         struct page **pages;
 257         size_t buffer_size;
 258         uint32_t buffer_free;
 259         struct list_head todo;
 260         wait_queue_head_t wait;
 261         struct binder_stats stats;
 262         struct list_head delivered_death;
 263         int max_threads;
 264         int requested_threads;
 265         int requested_threads_started;
 266         int ready_threads;
 267         long default_priority;
 268 };
 269
 270 enum {
 271         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 272         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 273         BINDER_LOOPER_STATE_EXITED      = 0x04,
 274         BINDER_LOOPER_STATE_INVALID     = 0x08,
 275         BINDER_LOOPER_STATE_WAITING     = 0x10,
 276         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 277 };
 278
 279 struct binder_thread {
 280         struct binder_proc *proc;
 281         struct rb_node rb_node;
 282         int pid;
 283         int looper;
 284         struct binder_transaction *transaction_stack;
 285         struct list_head todo;
 286         uint32_t return_error; /* Write failed, return error code in read buf */
 287         uint32_t return_error2; /* Write failed, return error code in read */
 288                 /* buffer. Used when sending a reply to a dead process that */
 289                 /* we are also waiting on */
 290         wait_queue_head_t wait;
 291         struct binder_stats stats;
 292 };
 293
 294 struct binder_transaction {
 295         int debug_id;
 296         struct binder_work work;
 297         struct binder_thread *from;
 298         struct binder_transaction *from_parent;
 299         struct binder_proc *to_proc;
 300         struct binder_thread *to_thread;
 301         struct binder_transaction *to_parent;
 302         unsigned need_reply : 1;
 303         /*unsigned is_dead : 1;*/ /* not used at the moment */
 304
 305         struct binder_buffer *buffer;
 306         unsigned int    code;
 307         unsigned int    flags;
 308         long    priority;
 309         long    saved_priority;
 310         uid_t   sender_euid;
 311 };
 312
 313 /*
 314  * copied from get_unused_fd_flags
 315  */
 316 int task_get_unused_fd_flags(struct task_struct *tsk, int flags)
 317 {
 318         struct files_struct *files = get_files_struct(tsk);
 319         int fd, error;
 320         struct fdtable *fdt;
 321         unsigned long rlim_cur;
 322
 323         if (files == NULL)
 324                 return -ESRCH;
 325
 326         error = -EMFILE;
 327         spin_lock(&files->file_lock);
 328
 329 repeat:
 330         fdt = files_fdtable(files);
 331         fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
 332                                 files->next_fd);
 333
 334         /*
 335          * N.B. For clone tasks sharing a files structure, this test
 336          * will limit the total number of files that can be opened.
 337          */
 338         rcu_read_lock();
 339         if (tsk->signal)
 340                 rlim_cur = tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
 341         else
 342                 rlim_cur = 0;
 343         rcu_read_unlock();
 344         if (fd >= rlim_cur)
 345                 goto out;
 346
 347         /* Do we need to expand the fd array or fd set?  */
 348         error = expand_files(files, fd);
 349         if (error < 0)
 350                 goto out;
 351
 352         if (error) {
 353                 /*
 354                  * If we needed to expand the fs array we
 355                  * might have blocked - try again.
 356                  */
 357                 error = -EMFILE;
 358                 goto repeat;
 359         }
 360
 361         FD_SET(fd, fdt->open_fds);
 362         if (flags & O_CLOEXEC)
 363                 FD_SET(fd, fdt->close_on_exec);
 364         else
 365                 FD_CLR(fd, fdt->close_on_exec);
 366         files->next_fd = fd + 1;
 367 #if 1
 368         /* Sanity check */
 369         if (fdt->fd[fd] != NULL) {
 370                 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
 371                 fdt->fd[fd] = NULL;
 372         }
 373 #endif
 374         error = fd;
 375
 376 out:
 377         spin_unlock(&files->file_lock);
 378         put_files_struct(files);
 379         return error;
 380 }
 381
 382 /*
 383  * copied from fd_install
 384  */
 385 static void task_fd_install(
 386         struct task_struct *tsk, unsigned int fd, struct file *file)
 387 {
 388         struct files_struct *files = get_files_struct(tsk);
 389         struct fdtable *fdt;
 390
 391         if (files == NULL)
 392                 return;
 393
 394         spin_lock(&files->file_lock);
 395         fdt = files_fdtable(files);
 396         BUG_ON(fdt->fd[fd] != NULL);
 397         rcu_assign_pointer(fdt->fd[fd], file);
 398         spin_unlock(&files->file_lock);
 399         put_files_struct(files);
 400 }
 401
 402 /*
 403  * copied from __put_unused_fd in open.c
 404  */
 405 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 406 {
 407         struct fdtable *fdt = files_fdtable(files);
 408         __FD_CLR(fd, fdt->open_fds);
 409         if (fd < files->next_fd)
 410                 files->next_fd = fd;
 411 }
 412
 413 /*
 414  * copied from sys_close
 415  */
 416 static long task_close_fd(struct task_struct *tsk, unsigned int fd)
 417 {
 418         struct file *filp;
 419         struct files_struct *files = get_files_struct(tsk);
 420         struct fdtable *fdt;
 421         int retval;
 422
 423         if (files == NULL)
 424                 return -ESRCH;
 425
 426         spin_lock(&files->file_lock);
 427         fdt = files_fdtable(files);
 428         if (fd >= fdt->max_fds)
 429                 goto out_unlock;
 430         filp = fdt->fd[fd];
 431         if (!filp)
 432                 goto out_unlock;
 433         rcu_assign_pointer(fdt->fd[fd], NULL);
 434         FD_CLR(fd, fdt->close_on_exec);
 435         __put_unused_fd(files, fd);
 436         spin_unlock(&files->file_lock);
 437         retval = filp_close(filp, files);
 438
 439         /* can't restart close syscall because file table entry was cleared */
 440         if (unlikely(retval == -ERESTARTSYS ||
 441                      retval == -ERESTARTNOINTR ||
 442                      retval == -ERESTARTNOHAND ||
 443                      retval == -ERESTART_RESTARTBLOCK))
 444                 retval = -EINTR;
 445
 446         put_files_struct(files);
 447         return retval;
 448
 449 out_unlock:
 450         spin_unlock(&files->file_lock);
 451         put_files_struct(files);
 452         return -EBADF;
 453 }
 454
 455 static void binder_set_nice(long nice)
 456 {
 457         long min_nice;
 458         if (can_nice(current, nice)) {
 459                 set_user_nice(current, nice);
 460                 return;
 461         }
 462         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 463         if (binder_debug_mask & BINDER_DEBUG_PRIORITY_CAP)
 464                 printk(KERN_INFO "binder: %d: nice value %ld not allowed use "
 465                        "%ld instead\n", current->pid, nice, min_nice);
 466         set_user_nice(current, min_nice);
 467         if (min_nice < 20)
 468                 return;
 469         binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
 470 }
 471
 472 static size_t binder_buffer_size(
 473         struct binder_proc *proc, struct binder_buffer *buffer)
 474 {
 475         if (list_is_last(&buffer->entry, &proc->buffers))
 476                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 477         else
 478                 return (size_t)list_entry(buffer->entry.next,
 479                         struct binder_buffer, entry) - (size_t)buffer->data;
 480 }
 481
 482 static void binder_insert_free_buffer(
 483         struct binder_proc *proc, struct binder_buffer *new_buffer)
 484 {
 485         struct rb_node **p = &proc->free_buffers.rb_node;
 486         struct rb_node *parent = NULL;
 487         struct binder_buffer *buffer;
 488         size_t buffer_size;
 489         size_t new_buffer_size;
 490
 491         BUG_ON(!new_buffer->free);
 492
 493         new_buffer_size = binder_buffer_size(proc, new_buffer);
 494
 495         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 496                 printk(KERN_INFO "binder: %d: add free buffer, size %zd, "
 497                        "at %p\n", proc->pid, new_buffer_size, new_buffer);
 498
 499         while (*p) {
 500                 parent = *p;
 501                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 502                 BUG_ON(!buffer->free);
 503
 504                 buffer_size = binder_buffer_size(proc, buffer);
 505
 506                 if (new_buffer_size < buffer_size)
 507                         p = &parent->rb_left;
 508                 else
 509                         p = &parent->rb_right;
 510         }
 511         rb_link_node(&new_buffer->rb_node, parent, p);
 512         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 513 }
 514
 515 static void binder_insert_allocated_buffer(
 516         struct binder_proc *proc, struct binder_buffer *new_buffer)
 517 {
 518         struct rb_node **p = &proc->allocated_buffers.rb_node;
 519         struct rb_node *parent = NULL;
 520         struct binder_buffer *buffer;
 521
 522         BUG_ON(new_buffer->free);
 523
 524         while (*p) {
 525                 parent = *p;
 526                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 527                 BUG_ON(buffer->free);
 528
 529                 if (new_buffer < buffer)
 530                         p = &parent->rb_left;
 531                 else if (new_buffer > buffer)
 532                         p = &parent->rb_right;
 533                 else
 534                         BUG();
 535         }
 536         rb_link_node(&new_buffer->rb_node, parent, p);
 537         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 538 }
 539
 540 static struct binder_buffer *binder_buffer_lookup(
 541         struct binder_proc *proc, void __user *user_ptr)
 542 {
 543         struct rb_node *n = proc->allocated_buffers.rb_node;
 544         struct binder_buffer *buffer;
 545         struct binder_buffer *kern_ptr;
 546
 547         kern_ptr = user_ptr - proc->user_buffer_offset
 548                 - offsetof(struct binder_buffer, data);
 549
 550         while (n) {
 551                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 552                 BUG_ON(buffer->free);
 553
 554                 if (kern_ptr < buffer)
 555                         n = n->rb_left;
 556                 else if (kern_ptr > buffer)
 557                         n = n->rb_right;
 558                 else
 559                         return buffer;
 560         }
 561         return NULL;
 562 }
 563
 564 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 565         void *start, void *end, struct vm_area_struct *vma)
 566 {
 567         void *page_addr;
 568         unsigned long user_page_addr;
 569         struct vm_struct tmp_area;
 570         struct page **page;
 571         struct mm_struct *mm;
 572
 573         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 574                 printk(KERN_INFO "binder: %d: %s pages %p-%p\n",
 575                        proc->pid, allocate ? "allocate" : "free", start, end);
 576
 577         if (end <= start)
 578                 return 0;
 579
 580         if (vma)
 581                 mm = NULL;
 582         else
 583                 mm = get_task_mm(proc->tsk);
 584
 585         if (mm) {
 586                 down_write(&mm->mmap_sem);
 587                 vma = proc->vma;
 588         }
 589
 590         if (allocate == 0)
 591                 goto free_range;
 592
 593         if (vma == NULL) {
 594                 printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
 595                        "map pages in userspace, no vma\n", proc->pid);
 596                 goto err_no_vma;
 597         }
 598
 599         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 600                 int ret;
 601                 struct page **page_array_ptr;
 602                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 603
 604                 BUG_ON(*page);
 605                 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 606                 if (*page == NULL) {
 607                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 608                                "for page at %p\n", proc->pid, page_addr);
 609                         goto err_alloc_page_failed;
 610                 }
 611                 tmp_area.addr = page_addr;
 612                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 613                 page_array_ptr = page;
 614                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 615                 if (ret) {
 616                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 617                                "to map page at %p in kernel\n",
 618                                proc->pid, page_addr);
 619                         goto err_map_kernel_failed;
 620                 }
 621                 user_page_addr = (size_t)page_addr + proc->user_buffer_offset;
 622                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 623                 if (ret) {
 624                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 625                                "to map page at %lx in userspace\n",
 626                                proc->pid, user_page_addr);
 627                         goto err_vm_insert_page_failed;
 628                 }
 629                 /* vm_insert_page does not seem to increment the refcount */
 630         }
 631         if (mm) {
 632                 up_write(&mm->mmap_sem);
 633                 mmput(mm);
 634         }
 635         return 0;
 636
 637 free_range:
 638         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 639              page_addr -= PAGE_SIZE) {
 640                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 641                 if (vma)
 642                         zap_page_range(vma, (size_t)page_addr +
 643                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 644 err_vm_insert_page_failed:
 645                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 646 err_map_kernel_failed:
 647                 __free_page(*page);
 648                 *page = NULL;
 649 err_alloc_page_failed:
 650                 ;
 651         }
 652 err_no_vma:
 653         if (mm) {
 654                 up_write(&mm->mmap_sem);
 655                 mmput(mm);
 656         }
 657         return -ENOMEM;
 658 }
 659
 660 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 661         size_t data_size, size_t offsets_size, int is_async)
 662 {
 663         struct rb_node *n = proc->free_buffers.rb_node;
 664         struct binder_buffer *buffer;
 665         size_t buffer_size;
 666         struct rb_node *best_fit = NULL;
 667         void *has_page_addr;
 668         void *end_page_addr;
 669         size_t size;
 670
 671         if (proc->vma == NULL) {
 672                 printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n",
 673                        proc->pid);
 674                 return NULL;
 675         }
 676
 677         size = ALIGN(data_size, sizeof(void *)) +
 678                 ALIGN(offsets_size, sizeof(void *));
 679
 680         if (size < data_size || size < offsets_size) {
 681                 binder_user_error("binder: %d: got transaction with invalid "
 682                         "size %zd-%zd\n", proc->pid, data_size, offsets_size);
 683                 return NULL;
 684         }
 685
 686         if (is_async &&
 687             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 688                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 689                         printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd f"
 690                                "ailed, no async space left\n", proc->pid, size);
 691                 return NULL;
 692         }
 693
 694         while (n) {
 695                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 696                 BUG_ON(!buffer->free);
 697                 buffer_size = binder_buffer_size(proc, buffer);
 698
 699                 if (size < buffer_size) {
 700                         best_fit = n;
 701                         n = n->rb_left;
 702                 } else if (size > buffer_size)
 703                         n = n->rb_right;
 704                 else {
 705                         best_fit = n;
 706                         break;
 707                 }
 708         }
 709         if (best_fit == NULL) {
 710                 printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, "
 711                        "no address space\n", proc->pid, size);
 712                 return NULL;
 713         }
 714         if (n == NULL) {
 715                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 716                 buffer_size = binder_buffer_size(proc, buffer);
 717         }
 718         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 719                 printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd got buff"
 720                        "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
 721
 722         has_page_addr =
 723                 (void *)(((size_t)buffer->data + buffer_size) & PAGE_MASK);
 724         if (n == NULL) {
 725                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 726                         buffer_size = size; /* no room for other buffers */
 727                 else
 728                         buffer_size = size + sizeof(struct binder_buffer);
 729         }
 730         end_page_addr = (void *)PAGE_ALIGN((size_t)buffer->data + buffer_size);
 731         if (end_page_addr > has_page_addr)
 732                 end_page_addr = has_page_addr;
 733         if (binder_update_page_range(proc, 1,
 734             (void *)PAGE_ALIGN((size_t)buffer->data), end_page_addr, NULL))
 735                 return NULL;
 736
 737         rb_erase(best_fit, &proc->free_buffers);
 738         buffer->free = 0;
 739         binder_insert_allocated_buffer(proc, buffer);
 740         if (buffer_size != size) {
 741                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 742                 list_add(&new_buffer->entry, &buffer->entry);
 743                 new_buffer->free = 1;
 744                 binder_insert_free_buffer(proc, new_buffer);
 745         }
 746         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 747                 printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd got "
 748                        "%p\n", proc->pid, size, buffer);
 749         buffer->data_size = data_size;
 750         buffer->offsets_size = offsets_size;
 751         buffer->async_transaction = is_async;
 752         if (is_async) {
 753                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 754                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
 755                         printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd "
 756                                "async free %zd\n", proc->pid, size,
 757                                proc->free_async_space);
 758         }
 759
 760         return buffer;
 761 }
 762
 763 static void *buffer_start_page(struct binder_buffer *buffer)
 764 {
 765         return (void *)((size_t)buffer & PAGE_MASK);
 766 }
 767
 768 static void *buffer_end_page(struct binder_buffer *buffer)
 769 {
 770         return (void *)(((size_t)(buffer + 1) - 1) & PAGE_MASK);
 771 }
 772
 773 static void binder_delete_free_buffer(
 774         struct binder_proc *proc, struct binder_buffer *buffer)
 775 {
 776         struct binder_buffer *prev, *next = NULL;
 777         int free_page_end = 1;
 778         int free_page_start = 1;
 779
 780         BUG_ON(proc->buffers.next == &buffer->entry);
 781         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 782         BUG_ON(!prev->free);
 783         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 784                 free_page_start = 0;
 785                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 786                         free_page_end = 0;
 787                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 788                         printk(KERN_INFO "binder: %d: merge free, buffer %p "
 789                                "share page with %p\n", proc->pid, buffer, prev);
 790         }
 791
 792         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 793                 next = list_entry(buffer->entry.next,
 794                                   struct binder_buffer, entry);
 795                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 796                         free_page_end = 0;
 797                         if (buffer_start_page(next) ==
 798                             buffer_start_page(buffer))
 799                                 free_page_start = 0;
 800                         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 801                                 printk(KERN_INFO "binder: %d: merge free, "
 802                                        "buffer %p share page with %p\n",
 803                                        proc->pid, buffer, prev);
 804                 }
 805         }
 806         list_del(&buffer->entry);
 807         if (free_page_start || free_page_end) {
 808                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 809                         printk(KERN_INFO "binder: %d: merge free, buffer %p do "
 810                                "not share page%s%s with with %p or %p\n",
 811                                proc->pid, buffer, free_page_start ? "" : " end",
 812                                free_page_end ? "" : " start", prev, next);
 813                 binder_update_page_range(proc, 0, free_page_start ?
 814                         buffer_start_page(buffer) : buffer_end_page(buffer),
 815                         (free_page_end ? buffer_end_page(buffer) :
 816                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 817         }
 818 }
 819
 820 static void binder_free_buf(
 821         struct binder_proc *proc, struct binder_buffer *buffer)
 822 {
 823         size_t size, buffer_size;
 824
 825         buffer_size = binder_buffer_size(proc, buffer);
 826
 827         size = ALIGN(buffer->data_size, sizeof(void *)) +
 828                 ALIGN(buffer->offsets_size, sizeof(void *));
 829         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
 830                 printk(KERN_INFO "binder: %d: binder_free_buf %p size %zd buffer"
 831                        "_size %zd\n", proc->pid, buffer, size, buffer_size);
 832
 833         BUG_ON(buffer->free);
 834         BUG_ON(size > buffer_size);
 835         BUG_ON(buffer->transaction != NULL);
 836         BUG_ON((void *)buffer < proc->buffer);
 837         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 838
 839         if (buffer->async_transaction) {
 840                 proc->free_async_space += size + sizeof(struct binder_buffer);
 841                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
 842                         printk(KERN_INFO "binder: %d: binder_free_buf size %zd "
 843                                "async free %zd\n", proc->pid, size,
 844                                proc->free_async_space);
 845         }
 846
 847         binder_update_page_range(proc, 0,
 848                 (void *)PAGE_ALIGN((size_t)buffer->data),
 849                 (void *)(((size_t)buffer->data + buffer_size) & PAGE_MASK),
 850                 NULL);
 851         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 852         buffer->free = 1;
 853         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 854                 struct binder_buffer *next = list_entry(buffer->entry.next,
 855                                                 struct binder_buffer, entry);
 856                 if (next->free) {
 857                         rb_erase(&next->rb_node, &proc->free_buffers);
 858                         binder_delete_free_buffer(proc, next);
 859                 }
 860         }
 861         if (proc->buffers.next != &buffer->entry) {
 862                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 863                                                 struct binder_buffer, entry);
 864                 if (prev->free) {
 865                         binder_delete_free_buffer(proc, buffer);
 866                         rb_erase(&prev->rb_node, &proc->free_buffers);
 867                         buffer = prev;
 868                 }
 869         }
 870         binder_insert_free_buffer(proc, buffer);
 871 }
 872
 873 static struct binder_node *
 874 binder_get_node(struct binder_proc *proc, void __user *ptr)
 875 {
 876         struct rb_node *n = proc->nodes.rb_node;
 877         struct binder_node *node;
 878
 879         while (n) {
 880                 node = rb_entry(n, struct binder_node, rb_node);
 881
 882                 if (ptr < node->ptr)
 883                         n = n->rb_left;
 884                 else if (ptr > node->ptr)
 885                         n = n->rb_right;
 886                 else
 887                         return node;
 888         }
 889         return NULL;
 890 }
 891
 892 static struct binder_node *
 893 binder_new_node(struct binder_proc *proc, void __user *ptr, void __user *cookie)
 894 {
 895         struct rb_node **p = &proc->nodes.rb_node;
 896         struct rb_node *parent = NULL;
 897         struct binder_node *node;
 898
 899         while (*p) {
 900                 parent = *p;
 901                 node = rb_entry(parent, struct binder_node, rb_node);
 902
 903                 if (ptr < node->ptr)
 904                         p = &(*p)->rb_left;
 905                 else if (ptr > node->ptr)
 906                         p = &(*p)->rb_right;
 907                 else
 908                         return NULL;
 909         }
 910
 911         node = kzalloc(sizeof(*node), GFP_KERNEL);
 912         if (node == NULL)
 913                 return NULL;
 914         binder_stats.obj_created[BINDER_STAT_NODE]++;
 915         rb_link_node(&node->rb_node, parent, p);
 916         rb_insert_color(&node->rb_node, &proc->nodes);
 917         node->debug_id = ++binder_last_id;
 918         node->proc = proc;
 919         node->ptr = ptr;
 920         node->cookie = cookie;
 921         node->work.type = BINDER_WORK_NODE;
 922         INIT_LIST_HEAD(&node->work.entry);
 923         INIT_LIST_HEAD(&node->async_todo);
 924         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
 925                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p created\n",
 926                        proc->pid, current->pid, node->debug_id,
 927                        node->ptr, node->cookie);
 928         return node;
 929 }
 930
 931 static int
 932 binder_inc_node(struct binder_node *node, int strong, int internal,
 933                 struct list_head *target_list)
 934 {
 935         if (strong) {
 936                 if (internal) {
 937                         if (target_list == NULL &&
 938                             node->internal_strong_refs == 0 &&
 939                             !(node == binder_context_mgr_node &&
 940                             node->has_strong_ref)) {
 941                                 printk(KERN_ERR "binder: invalid inc strong "
 942                                         "node for %d\n", node->debug_id);
 943                                 return -EINVAL;
 944                         }
 945                         node->internal_strong_refs++;
 946                 } else
 947                         node->local_strong_refs++;
 948                 if (!node->has_strong_ref && target_list) {
 949                         list_del_init(&node->work.entry);
 950                         list_add_tail(&node->work.entry, target_list);
 951                 }
 952         } else {
 953                 if (!internal)
 954                         node->local_weak_refs++;
 955                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 956                         if (target_list == NULL) {
 957                                 printk(KERN_ERR "binder: invalid inc weak node "
 958                                         "for %d\n", node->debug_id);
 959                                 return -EINVAL;
 960                         }
 961                         list_add_tail(&node->work.entry, target_list);
 962                 }
 963         }
 964         return 0;
 965 }
 966
 967 static int
 968 binder_dec_node(struct binder_node *node, int strong, int internal)
 969 {
 970         if (strong) {
 971                 if (internal)
 972                         node->internal_strong_refs--;
 973                 else
 974                         node->local_strong_refs--;
 975                 if (node->local_strong_refs || node->internal_strong_refs)
 976                         return 0;
 977         } else {
 978                 if (!internal)
 979                         node->local_weak_refs--;
 980                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 981                         return 0;
 982         }
 983         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 984                 if (list_empty(&node->work.entry)) {
 985                         list_add_tail(&node->work.entry, &node->proc->todo);
 986                         wake_up_interruptible(&node->proc->wait);
 987                 }
 988         } else {
 989                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 990                     !node->local_weak_refs) {
 991                         list_del_init(&node->work.entry);
 992                         if (node->proc) {
 993                                 rb_erase(&node->rb_node, &node->proc->nodes);
 994                                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
 995                                         printk(KERN_INFO "binder: refless node %d deleted\n", node->debug_id);
 996                         } else {
 997                                 hlist_del(&node->dead_node);
 998                                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
 999                                         printk(KERN_INFO "binder: dead node %d deleted\n", node->debug_id);
1000                         }
1001                         kfree(node);
1002                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
1003                 }
1004         }
1005
1006         return 0;
1007 }
1008
1009
1010 static struct binder_ref *
1011 binder_get_ref(struct binder_proc *proc, uint32_t desc)
1012 {
1013         struct rb_node *n = proc->refs_by_desc.rb_node;
1014         struct binder_ref *ref;
1015
1016         while (n) {
1017                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1018
1019                 if (desc < ref->desc)
1020                         n = n->rb_left;
1021                 else if (desc > ref->desc)
1022                         n = n->rb_right;
1023                 else
1024                         return ref;
1025         }
1026         return NULL;
1027 }
1028
1029 static struct binder_ref *
1030 binder_get_ref_for_node(struct binder_proc *proc, struct binder_node *node)
1031 {
1032         struct rb_node *n;
1033         struct rb_node **p = &proc->refs_by_node.rb_node;
1034         struct rb_node *parent = NULL;
1035         struct binder_ref *ref, *new_ref;
1036
1037         while (*p) {
1038                 parent = *p;
1039                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1040
1041                 if (node < ref->node)
1042                         p = &(*p)->rb_left;
1043                 else if (node > ref->node)
1044                         p = &(*p)->rb_right;
1045                 else
1046                         return ref;
1047         }
1048         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1049         if (new_ref == NULL)
1050                 return NULL;
1051         binder_stats.obj_created[BINDER_STAT_REF]++;
1052         new_ref->debug_id = ++binder_last_id;
1053         new_ref->proc = proc;
1054         new_ref->node = node;
1055         rb_link_node(&new_ref->rb_node_node, parent, p);
1056         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1057
1058         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1059         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1060                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1061                 if (ref->desc > new_ref->desc)
1062                         break;
1063                 new_ref->desc = ref->desc + 1;
1064         }
1065
1066         p = &proc->refs_by_desc.rb_node;
1067         while (*p) {
1068                 parent = *p;
1069                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1070
1071                 if (new_ref->desc < ref->desc)
1072                         p = &(*p)->rb_left;
1073                 else if (new_ref->desc > ref->desc)
1074                         p = &(*p)->rb_right;
1075                 else
1076                         BUG();
1077         }
1078         rb_link_node(&new_ref->rb_node_desc, parent, p);
1079         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1080         if (node) {
1081                 hlist_add_head(&new_ref->node_entry, &node->refs);
1082                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
1083                         printk(KERN_INFO "binder: %d new ref %d desc %d for "
1084                                 "node %d\n", proc->pid, new_ref->debug_id,
1085                                 new_ref->desc, node->debug_id);
1086         } else {
1087                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
1088                         printk(KERN_INFO "binder: %d new ref %d desc %d for "
1089                                 "dead node\n", proc->pid, new_ref->debug_id,
1090                                 new_ref->desc);
1091         }
1092         return new_ref;
1093 }
1094
1095 static void
1096 binder_delete_ref(struct binder_ref *ref)
1097 {
1098         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
1099                 printk(KERN_INFO "binder: %d delete ref %d desc %d for "
1100                         "node %d\n", ref->proc->pid, ref->debug_id,
1101                         ref->desc, ref->node->debug_id);
1102         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1103         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1104         if (ref->strong)
1105                 binder_dec_node(ref->node, 1, 1);
1106         hlist_del(&ref->node_entry);
1107         binder_dec_node(ref->node, 0, 1);
1108         if (ref->death) {
1109                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
1110                         printk(KERN_INFO "binder: %d delete ref %d desc %d "
1111                                 "has death notification\n", ref->proc->pid,
1112                                 ref->debug_id, ref->desc);
1113                 list_del(&ref->death->work.entry);
1114                 kfree(ref->death);
1115                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
1116         }
1117         kfree(ref);
1118         binder_stats.obj_deleted[BINDER_STAT_REF]++;
1119 }
1120
1121 static int
1122 binder_inc_ref(
1123         struct binder_ref *ref, int strong, struct list_head *target_list)
1124 {
1125         int ret;
1126         if (strong) {
1127                 if (ref->strong == 0) {
1128                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1129                         if (ret)
1130                                 return ret;
1131                 }
1132                 ref->strong++;
1133         } else {
1134                 if (ref->weak == 0) {
1135                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1136                         if (ret)
1137                                 return ret;
1138                 }
1139                 ref->weak++;
1140         }
1141         return 0;
1142 }
1143
1144
1145 static int
1146 binder_dec_ref(struct binder_ref *ref, int strong)
1147 {
1148         if (strong) {
1149                 if (ref->strong == 0) {
1150                         binder_user_error("binder: %d invalid dec strong, "
1151                                           "ref %d desc %d s %d w %d\n",
1152                                           ref->proc->pid, ref->debug_id,
1153                                           ref->desc, ref->strong, ref->weak);
1154                         return -EINVAL;
1155                 }
1156                 ref->strong--;
1157                 if (ref->strong == 0) {
1158                         int ret;
1159                         ret = binder_dec_node(ref->node, strong, 1);
1160                         if (ret)
1161                                 return ret;
1162                 }
1163         } else {
1164                 if (ref->weak == 0) {
1165                         binder_user_error("binder: %d invalid dec weak, "
1166                                           "ref %d desc %d s %d w %d\n",
1167                                           ref->proc->pid, ref->debug_id,
1168                                           ref->desc, ref->strong, ref->weak);
1169                         return -EINVAL;
1170                 }
1171                 ref->weak--;
1172         }
1173         if (ref->strong == 0 && ref->weak == 0)
1174                 binder_delete_ref(ref);
1175         return 0;
1176 }
1177
1178 static void
1179 binder_pop_transaction(
1180         struct binder_thread *target_thread, struct binder_transaction *t)
1181 {
1182         if (target_thread) {
1183                 BUG_ON(target_thread->transaction_stack != t);
1184                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1185                 target_thread->transaction_stack =
1186                         target_thread->transaction_stack->from_parent;
1187                 t->from = NULL;
1188         }
1189         t->need_reply = 0;
1190         if (t->buffer)
1191                 t->buffer->transaction = NULL;
1192         kfree(t);
1193         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1194 }
1195
1196 static void
1197 binder_send_failed_reply(struct binder_transaction *t, uint32_t error_code)
1198 {
1199         struct binder_thread *target_thread;
1200         BUG_ON(t->flags & TF_ONE_WAY);
1201         while (1) {
1202                 target_thread = t->from;
1203                 if (target_thread) {
1204                         if (target_thread->return_error != BR_OK &&
1205                            target_thread->return_error2 == BR_OK) {
1206                                 target_thread->return_error2 =
1207                                         target_thread->return_error;
1208                                 target_thread->return_error = BR_OK;
1209                         }
1210                         if (target_thread->return_error == BR_OK) {
1211                                 if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1212                                         printk(KERN_INFO "binder: send failed reply for transaction %d to %d:%d\n",
1213                                                t->debug_id, target_thread->proc->pid, target_thread->pid);
1214
1215                                 binder_pop_transaction(target_thread, t);
1216                                 target_thread->return_error = error_code;
1217                                 wake_up_interruptible(&target_thread->wait);
1218                         } else {
1219                                 printk(KERN_ERR "binder: reply failed, target "
1220                                         "thread, %d:%d, has error code %d "
1221                                         "already\n", target_thread->proc->pid,
1222                                         target_thread->pid,
1223                                         target_thread->return_error);
1224                         }
1225                         return;
1226                 } else {
1227                         struct binder_transaction *next = t->from_parent;
1228
1229                         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1230                                 printk(KERN_INFO "binder: send failed reply "
1231                                         "for transaction %d, target dead\n",
1232                                         t->debug_id);
1233
1234                         binder_pop_transaction(target_thread, t);
1235                         if (next == NULL) {
1236                                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
1237                                         printk(KERN_INFO "binder: reply failed,"
1238                                                 " no target thread at root\n");
1239                                 return;
1240                         }
1241                         t = next;
1242                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
1243                                 printk(KERN_INFO "binder: reply failed, no targ"
1244                                         "et thread -- retry %d\n", t->debug_id);
1245                 }
1246         }
1247 }
1248
1249 static void
1250 binder_transaction_buffer_release(struct binder_proc *proc,
1251                         struct binder_buffer *buffer, size_t *failed_at);
1252
1253 static void
1254 binder_transaction(struct binder_proc *proc, struct binder_thread *thread,
1255         struct binder_transaction_data *tr, int reply)
1256 {
1257         struct binder_transaction *t;
1258         struct binder_work *tcomplete;
1259         size_t *offp, *off_end;
1260         struct binder_proc *target_proc;
1261         struct binder_thread *target_thread = NULL;
1262         struct binder_node *target_node = NULL;
1263         struct list_head *target_list;
1264         wait_queue_head_t *target_wait;
1265         struct binder_transaction *in_reply_to = NULL;
1266         struct binder_transaction_log_entry *e;
1267         uint32_t return_error;
1268
1269         e = binder_transaction_log_add(&binder_transaction_log);
1270         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1271         e->from_proc = proc->pid;
1272         e->from_thread = thread->pid;
1273         e->target_handle = tr->target.handle;
1274         e->data_size = tr->data_size;
1275         e->offsets_size = tr->offsets_size;
1276
1277         if (reply) {
1278                 in_reply_to = thread->transaction_stack;
1279                 if (in_reply_to == NULL) {
1280                         binder_user_error("binder: %d:%d got reply transaction "
1281                                           "with no transaction stack\n",
1282                                           proc->pid, thread->pid);
1283                         return_error = BR_FAILED_REPLY;
1284                         goto err_empty_call_stack;
1285                 }
1286                 binder_set_nice(in_reply_to->saved_priority);
1287                 if (in_reply_to->to_thread != thread) {
1288                         binder_user_error("binder: %d:%d got reply transaction "
1289                                 "with bad transaction stack,"
1290                                 " transaction %d has target %d:%d\n",
1291                                 proc->pid, thread->pid, in_reply_to->debug_id,
1292                                 in_reply_to->to_proc ?
1293                                 in_reply_to->to_proc->pid : 0,
1294                                 in_reply_to->to_thread ?
1295                                 in_reply_to->to_thread->pid : 0);
1296                         return_error = BR_FAILED_REPLY;
1297                         in_reply_to = NULL;
1298                         goto err_bad_call_stack;
1299                 }
1300                 thread->transaction_stack = in_reply_to->to_parent;
1301                 target_thread = in_reply_to->from;
1302                 if (target_thread == NULL) {
1303                         return_error = BR_DEAD_REPLY;
1304                         goto err_dead_binder;
1305                 }
1306                 if (target_thread->transaction_stack != in_reply_to) {
1307                         binder_user_error("binder: %d:%d got reply transaction "
1308                                 "with bad target transaction stack %d, "
1309                                 "expected %d\n",
1310                                 proc->pid, thread->pid,
1311                                 target_thread->transaction_stack ?
1312                                 target_thread->transaction_stack->debug_id : 0,
1313                                 in_reply_to->debug_id);
1314                         return_error = BR_FAILED_REPLY;
1315                         in_reply_to = NULL;
1316                         target_thread = NULL;
1317                         goto err_dead_binder;
1318                 }
1319                 target_proc = target_thread->proc;
1320         } else {
1321                 if (tr->target.handle) {
1322                         struct binder_ref *ref;
1323                         ref = binder_get_ref(proc, tr->target.handle);
1324                         if (ref == NULL) {
1325                                 binder_user_error("binder: %d:%d got "
1326                                         "transaction to invalid handle\n",
1327                                         proc->pid, thread->pid);
1328                                 return_error = BR_FAILED_REPLY;
1329                                 goto err_invalid_target_handle;
1330                         }
1331                         target_node = ref->node;
1332                 } else {
1333                         target_node = binder_context_mgr_node;
1334                         if (target_node == NULL) {
1335                                 return_error = BR_DEAD_REPLY;
1336                                 goto err_no_context_mgr_node;
1337                         }
1338                 }
1339                 e->to_node = target_node->debug_id;
1340                 target_proc = target_node->proc;
1341                 if (target_proc == NULL) {
1342                         return_error = BR_DEAD_REPLY;
1343                         goto err_dead_binder;
1344                 }
1345                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1346                         struct binder_transaction *tmp;
1347                         tmp = thread->transaction_stack;
1348                         while (tmp) {
1349                                 if (tmp->from && tmp->from->proc == target_proc)
1350                                         target_thread = tmp->from;
1351                                 tmp = tmp->from_parent;
1352                         }
1353                 }
1354         }
1355         if (target_thread) {
1356                 e->to_thread = target_thread->pid;
1357                 target_list = &target_thread->todo;
1358                 target_wait = &target_thread->wait;
1359         } else {
1360                 target_list = &target_proc->todo;
1361                 target_wait = &target_proc->wait;
1362         }
1363         e->to_proc = target_proc->pid;
1364
1365         /* TODO: reuse incoming transaction for reply */
1366         t = kzalloc(sizeof(*t), GFP_KERNEL);
1367         if (t == NULL) {
1368                 return_error = BR_FAILED_REPLY;
1369                 goto err_alloc_t_failed;
1370         }
1371         binder_stats.obj_created[BINDER_STAT_TRANSACTION]++;
1372
1373         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1374         if (tcomplete == NULL) {
1375                 return_error = BR_FAILED_REPLY;
1376                 goto err_alloc_tcomplete_failed;
1377         }
1378         binder_stats.obj_created[BINDER_STAT_TRANSACTION_COMPLETE]++;
1379
1380         t->debug_id = ++binder_last_id;
1381         e->debug_id = t->debug_id;
1382
1383         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION) {
1384                 if (reply)
1385                         printk(KERN_INFO "binder: %d:%d BC_REPLY %d -> %d:%d, "
1386                                "data %p-%p size %zd-%zd\n",
1387                                proc->pid, thread->pid, t->debug_id,
1388                                target_proc->pid, target_thread->pid,
1389                                tr->data.ptr.buffer, tr->data.ptr.offsets,
1390                                tr->data_size, tr->offsets_size);
1391                 else
1392                         printk(KERN_INFO "binder: %d:%d BC_TRANSACTION %d -> "
1393                                "%d - node %d, data %p-%p size %zd-%zd\n",
1394                                proc->pid, thread->pid, t->debug_id,
1395                                target_proc->pid, target_node->debug_id,
1396                                tr->data.ptr.buffer, tr->data.ptr.offsets,
1397                                tr->data_size, tr->offsets_size);
1398         }
1399
1400         if (!reply && !(tr->flags & TF_ONE_WAY))
1401                 t->from = thread;
1402         else
1403                 t->from = NULL;
1404         t->sender_euid = proc->tsk->cred->euid;
1405         t->to_proc = target_proc;
1406         t->to_thread = target_thread;
1407         t->code = tr->code;
1408         t->flags = tr->flags;
1409         t->priority = task_nice(current);
1410         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1411                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1412         if (t->buffer == NULL) {
1413                 return_error = BR_FAILED_REPLY;
1414                 goto err_binder_alloc_buf_failed;
1415         }
1416         t->buffer->allow_user_free = 0;
1417         t->buffer->debug_id = t->debug_id;
1418         t->buffer->transaction = t;
1419         t->buffer->target_node = target_node;
1420         if (target_node)
1421                 binder_inc_node(target_node, 1, 0, NULL);
1422
1423         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1424
1425         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1426                 binder_user_error("binder: %d:%d got transaction with invalid "
1427                         "data ptr\n", proc->pid, thread->pid);
1428                 return_error = BR_FAILED_REPLY;
1429                 goto err_copy_data_failed;
1430         }
1431         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1432                 binder_user_error("binder: %d:%d got transaction with invalid "
1433                         "offsets ptr\n", proc->pid, thread->pid);
1434                 return_error = BR_FAILED_REPLY;
1435                 goto err_copy_data_failed;
1436         }
1437         off_end = (void *)offp + tr->offsets_size;
1438         for (; offp < off_end; offp++) {
1439                 struct flat_binder_object *fp;
1440                 if (*offp > t->buffer->data_size - sizeof(*fp)) {
1441                         binder_user_error("binder: %d:%d got transaction with "
1442                                 "invalid offset, %zd\n",
1443                                 proc->pid, thread->pid, *offp);
1444                         return_error = BR_FAILED_REPLY;
1445                         goto err_bad_offset;
1446                 }
1447                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1448                 switch (fp->type) {
1449                 case BINDER_TYPE_BINDER:
1450                 case BINDER_TYPE_WEAK_BINDER: {
1451                         struct binder_ref *ref;
1452                         struct binder_node *node = binder_get_node(proc, fp->binder);
1453                         if (node == NULL) {
1454                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1455                                 if (node == NULL) {
1456                                         return_error = BR_FAILED_REPLY;
1457                                         goto err_binder_new_node_failed;
1458                                 }
1459                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1460                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1461                         }
1462                         if (fp->cookie != node->cookie) {
1463                                 binder_user_error("binder: %d:%d sending u%p "
1464                                         "node %d, cookie mismatch %p != %p\n",
1465                                         proc->pid, thread->pid,
1466                                         fp->binder, node->debug_id,
1467                                         fp->cookie, node->cookie);
1468                                 goto err_binder_get_ref_for_node_failed;
1469                         }
1470                         ref = binder_get_ref_for_node(target_proc, node);
1471                         if (ref == NULL) {
1472                                 return_error = BR_FAILED_REPLY;
1473                                 goto err_binder_get_ref_for_node_failed;
1474                         }
1475                         if (fp->type == BINDER_TYPE_BINDER)
1476                                 fp->type = BINDER_TYPE_HANDLE;
1477                         else
1478                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1479                         fp->handle = ref->desc;
1480                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE, &thread->todo);
1481                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1482                                 printk(KERN_INFO "        node %d u%p -> ref %d desc %d\n",
1483                                        node->debug_id, node->ptr, ref->debug_id, ref->desc);
1484                 } break;
1485                 case BINDER_TYPE_HANDLE:
1486                 case BINDER_TYPE_WEAK_HANDLE: {
1487                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1488                         if (ref == NULL) {
1489                                 binder_user_error("binder: %d:%d got "
1490                                         "transaction with invalid "
1491                                         "handle, %ld\n", proc->pid,
1492                                         thread->pid, fp->handle);
1493                                 return_error = BR_FAILED_REPLY;
1494                                 goto err_binder_get_ref_failed;
1495                         }
1496                         if (ref->node->proc == target_proc) {
1497                                 if (fp->type == BINDER_TYPE_HANDLE)
1498                                         fp->type = BINDER_TYPE_BINDER;
1499                                 else
1500                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1501                                 fp->binder = ref->node->ptr;
1502                                 fp->cookie = ref->node->cookie;
1503                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1504                                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1505                                         printk(KERN_INFO "        ref %d desc %d -> node %d u%p\n",
1506                                                ref->debug_id, ref->desc, ref->node->debug_id, ref->node->ptr);
1507                         } else {
1508                                 struct binder_ref *new_ref;
1509                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1510                                 if (new_ref == NULL) {
1511                                         return_error = BR_FAILED_REPLY;
1512                                         goto err_binder_get_ref_for_node_failed;
1513                                 }
1514                                 fp->handle = new_ref->desc;
1515                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1516                                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1517                                         printk(KERN_INFO "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1518                                                ref->debug_id, ref->desc, new_ref->debug_id, new_ref->desc, ref->node->debug_id);
1519                         }
1520                 } break;
1521
1522                 case BINDER_TYPE_FD: {
1523                         int target_fd;
1524                         struct file *file;
1525
1526                         if (reply) {
1527                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1528                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1529                                                 proc->pid, thread->pid, fp->handle);
1530                                         return_error = BR_FAILED_REPLY;
1531                                         goto err_fd_not_allowed;
1532                                 }
1533                         } else if (!target_node->accept_fds) {
1534                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1535                                         proc->pid, thread->pid, fp->handle);
1536                                 return_error = BR_FAILED_REPLY;
1537                                 goto err_fd_not_allowed;
1538                         }
1539
1540                         file = fget(fp->handle);
1541                         if (file == NULL) {
1542                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1543                                         proc->pid, thread->pid, fp->handle);
1544                                 return_error = BR_FAILED_REPLY;
1545                                 goto err_fget_failed;
1546                         }
1547                         target_fd = task_get_unused_fd_flags(target_proc->tsk, O_CLOEXEC);
1548                         if (target_fd < 0) {
1549                                 fput(file);
1550                                 return_error = BR_FAILED_REPLY;
1551                                 goto err_get_unused_fd_failed;
1552                         }
1553                         task_fd_install(target_proc->tsk, target_fd, file);
1554                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1555                                 printk(KERN_INFO "        fd %ld -> %d\n", fp->handle, target_fd);
1556                         /* TODO: fput? */
1557                         fp->handle = target_fd;
1558                 } break;
1559
1560                 default:
1561                         binder_user_error("binder: %d:%d got transactio"
1562                                 "n with invalid object type, %lx\n",
1563                                 proc->pid, thread->pid, fp->type);
1564                         return_error = BR_FAILED_REPLY;
1565                         goto err_bad_object_type;
1566                 }
1567         }
1568         if (reply) {
1569                 BUG_ON(t->buffer->async_transaction != 0);
1570                 binder_pop_transaction(target_thread, in_reply_to);
1571         } else if (!(t->flags & TF_ONE_WAY)) {
1572                 BUG_ON(t->buffer->async_transaction != 0);
1573                 t->need_reply = 1;
1574                 t->from_parent = thread->transaction_stack;
1575                 thread->transaction_stack = t;
1576         } else {
1577                 BUG_ON(target_node == NULL);
1578                 BUG_ON(t->buffer->async_transaction != 1);
1579                 if (target_node->has_async_transaction) {
1580                         target_list = &target_node->async_todo;
1581                         target_wait = NULL;
1582                 } else
1583                         target_node->has_async_transaction = 1;
1584         }
1585         t->work.type = BINDER_WORK_TRANSACTION;
1586         list_add_tail(&t->work.entry, target_list);
1587         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1588         list_add_tail(&tcomplete->entry, &thread->todo);
1589         if (target_wait)
1590                 wake_up_interruptible(target_wait);
1591         return;
1592
1593 err_get_unused_fd_failed:
1594 err_fget_failed:
1595 err_fd_not_allowed:
1596 err_binder_get_ref_for_node_failed:
1597 err_binder_get_ref_failed:
1598 err_binder_new_node_failed:
1599 err_bad_object_type:
1600 err_bad_offset:
1601 err_copy_data_failed:
1602         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1603         t->buffer->transaction = NULL;
1604         binder_free_buf(target_proc, t->buffer);
1605 err_binder_alloc_buf_failed:
1606         kfree(tcomplete);
1607         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
1608 err_alloc_tcomplete_failed:
1609         kfree(t);
1610         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1611 err_alloc_t_failed:
1612 err_bad_call_stack:
1613 err_empty_call_stack:
1614 err_dead_binder:
1615 err_invalid_target_handle:
1616 err_no_context_mgr_node:
1617         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1618                 printk(KERN_INFO "binder: %d:%d transaction failed %d, size"
1619                                 "%zd-%zd\n",
1620                            proc->pid, thread->pid, return_error,
1621                            tr->data_size, tr->offsets_size);
1622
1623         {
1624                 struct binder_transaction_log_entry *fe;
1625                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1626                 *fe = *e;
1627         }
1628
1629         BUG_ON(thread->return_error != BR_OK);
1630         if (in_reply_to) {
1631                 thread->return_error = BR_TRANSACTION_COMPLETE;
1632                 binder_send_failed_reply(in_reply_to, return_error);
1633         } else
1634                 thread->return_error = return_error;
1635 }
1636
1637 static void
1638 binder_transaction_buffer_release(struct binder_proc *proc, struct binder_buffer *buffer, size_t *failed_at)
1639 {
1640         size_t *offp, *off_end;
1641         int debug_id = buffer->debug_id;
1642
1643         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1644                 printk(KERN_INFO "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1645                            proc->pid, buffer->debug_id,
1646                            buffer->data_size, buffer->offsets_size, failed_at);
1647
1648         if (buffer->target_node)
1649                 binder_dec_node(buffer->target_node, 1, 0);
1650
1651         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1652         if (failed_at)
1653                 off_end = failed_at;
1654         else
1655                 off_end = (void *)offp + buffer->offsets_size;
1656         for (; offp < off_end; offp++) {
1657                 struct flat_binder_object *fp;
1658                 if (*offp > buffer->data_size - sizeof(*fp)) {
1659                         printk(KERN_ERR "binder: transaction release %d bad"
1660                                         "offset %zd, size %zd\n", debug_id, *offp, buffer->data_size);
1661                         continue;
1662                 }
1663                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1664                 switch (fp->type) {
1665                 case BINDER_TYPE_BINDER:
1666                 case BINDER_TYPE_WEAK_BINDER: {
1667                         struct binder_node *node = binder_get_node(proc, fp->binder);
1668                         if (node == NULL) {
1669                                 printk(KERN_ERR "binder: transaction release %d bad node %p\n", debug_id, fp->binder);
1670                                 break;
1671                         }
1672                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1673                                 printk(KERN_INFO "        node %d u%p\n",
1674                                        node->debug_id, node->ptr);
1675                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1676                 } break;
1677                 case BINDER_TYPE_HANDLE:
1678                 case BINDER_TYPE_WEAK_HANDLE: {
1679                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1680                         if (ref == NULL) {
1681                                 printk(KERN_ERR "binder: transaction release %d bad handle %ld\n", debug_id, fp->handle);
1682                                 break;
1683                         }
1684                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1685                                 printk(KERN_INFO "        ref %d desc %d (node %d)\n",
1686                                        ref->debug_id, ref->desc, ref->node->debug_id);
1687                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1688                 } break;
1689
1690                 case BINDER_TYPE_FD:
1691                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
1692                                 printk(KERN_INFO "        fd %ld\n", fp->handle);
1693                         if (failed_at)
1694                                 task_close_fd(proc->tsk, fp->handle);
1695                         break;
1696
1697                 default:
1698                         printk(KERN_ERR "binder: transaction release %d bad object type %lx\n", debug_id, fp->type);
1699                         break;
1700                 }
1701         }
1702 }
1703
1704 int
1705 binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1706                     void __user *buffer, int size, signed long *consumed)
1707 {
1708         uint32_t cmd;
1709         void __user *ptr = buffer + *consumed;
1710         void __user *end = buffer + size;
1711
1712         while (ptr < end && thread->return_error == BR_OK) {
1713                 if (get_user(cmd, (uint32_t __user *)ptr))
1714                         return -EFAULT;
1715                 ptr += sizeof(uint32_t);
1716                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1717                         binder_stats.bc[_IOC_NR(cmd)]++;
1718                         proc->stats.bc[_IOC_NR(cmd)]++;
1719                         thread->stats.bc[_IOC_NR(cmd)]++;
1720                 }
1721                 switch (cmd) {
1722                 case BC_INCREFS:
1723                 case BC_ACQUIRE:
1724                 case BC_RELEASE:
1725                 case BC_DECREFS: {
1726                         uint32_t target;
1727                         struct binder_ref *ref;
1728                         const char *debug_string;
1729
1730                         if (get_user(target, (uint32_t __user *)ptr))
1731                                 return -EFAULT;
1732                         ptr += sizeof(uint32_t);
1733                         if (target == 0 && binder_context_mgr_node &&
1734                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1735                                 ref = binder_get_ref_for_node(proc,
1736                                                binder_context_mgr_node);
1737                                 if (ref->desc != target) {
1738                                         binder_user_error("binder: %d:"
1739                                                 "%d tried to acquire "
1740                                                 "reference to desc 0, "
1741                                                 "got %d instead\n",
1742                                                 proc->pid, thread->pid,
1743                                                 ref->desc);
1744                                 }
1745                         } else
1746                                 ref = binder_get_ref(proc, target);
1747                         if (ref == NULL) {
1748                                 binder_user_error("binder: %d:%d refcou"
1749                                         "nt change on invalid ref %d\n",
1750                                         proc->pid, thread->pid, target);
1751                                 break;
1752                         }
1753                         switch (cmd) {
1754                         case BC_INCREFS:
1755                                 debug_string = "IncRefs";
1756                                 binder_inc_ref(ref, 0, NULL);
1757                                 break;
1758                         case BC_ACQUIRE:
1759                                 debug_string = "Acquire";
1760                                 binder_inc_ref(ref, 1, NULL);
1761                                 break;
1762                         case BC_RELEASE:
1763                                 debug_string = "Release";
1764                                 binder_dec_ref(ref, 1);
1765                                 break;
1766                         case BC_DECREFS:
1767                         default:
1768                                 debug_string = "DecRefs";
1769                                 binder_dec_ref(ref, 0);
1770                                 break;
1771                         }
1772                         if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
1773                                 printk(KERN_INFO "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1774                                        proc->pid, thread->pid, debug_string, ref->debug_id, ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1775                         break;
1776                 }
1777                 case BC_INCREFS_DONE:
1778                 case BC_ACQUIRE_DONE: {
1779                         void __user *node_ptr;
1780                         void *cookie;
1781                         struct binder_node *node;
1782
1783                         if (get_user(node_ptr, (void * __user *)ptr))
1784                                 return -EFAULT;
1785                         ptr += sizeof(void *);
1786                         if (get_user(cookie, (void * __user *)ptr))
1787                                 return -EFAULT;
1788                         ptr += sizeof(void *);
1789                         node = binder_get_node(proc, node_ptr);
1790                         if (node == NULL) {
1791                                 binder_user_error("binder: %d:%d "
1792                                         "%s u%p no match\n",
1793                                         proc->pid, thread->pid,
1794                                         cmd == BC_INCREFS_DONE ?
1795                                         "BC_INCREFS_DONE" :
1796                                         "BC_ACQUIRE_DONE",
1797                                         node_ptr);
1798                                 break;
1799                         }
1800                         if (cookie != node->cookie) {
1801                                 binder_user_error("binder: %d:%d %s u%p node %d"
1802                                         " cookie mismatch %p != %p\n",
1803                                         proc->pid, thread->pid,
1804                                         cmd == BC_INCREFS_DONE ?
1805                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1806                                         node_ptr, node->debug_id,
1807                                         cookie, node->cookie);
1808                                 break;
1809                         }
1810                         if (cmd == BC_ACQUIRE_DONE) {
1811                                 if (node->pending_strong_ref == 0) {
1812                                         binder_user_error("binder: %d:%d "
1813                                                 "BC_ACQUIRE_DONE node %d has "
1814                                                 "no pending acquire request\n",
1815                                                 proc->pid, thread->pid,
1816                                                 node->debug_id);
1817                                         break;
1818                                 }
1819                                 node->pending_strong_ref = 0;
1820                         } else {
1821                                 if (node->pending_weak_ref == 0) {
1822                                         binder_user_error("binder: %d:%d "
1823                                                 "BC_INCREFS_DONE node %d has "
1824                                                 "no pending increfs request\n",
1825                                                 proc->pid, thread->pid,
1826                                                 node->debug_id);
1827                                         break;
1828                                 }
1829                                 node->pending_weak_ref = 0;
1830                         }
1831                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1832                         if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
1833                                 printk(KERN_INFO "binder: %d:%d %s node %d ls %d lw %d\n",
1834                                        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);
1835                         break;
1836                 }
1837                 case BC_ATTEMPT_ACQUIRE:
1838                         printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported\n");
1839                         return -EINVAL;
1840                 case BC_ACQUIRE_RESULT:
1841                         printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported\n");
1842                         return -EINVAL;
1843
1844                 case BC_FREE_BUFFER: {
1845                         void __user *data_ptr;
1846                         struct binder_buffer *buffer;
1847
1848                         if (get_user(data_ptr, (void * __user *)ptr))
1849                                 return -EFAULT;
1850                         ptr += sizeof(void *);
1851
1852                         buffer = binder_buffer_lookup(proc, data_ptr);
1853                         if (buffer == NULL) {
1854                                 binder_user_error("binder: %d:%d "
1855                                         "BC_FREE_BUFFER u%p no match\n",
1856                                         proc->pid, thread->pid, data_ptr);
1857                                 break;
1858                         }
1859                         if (!buffer->allow_user_free) {
1860                                 binder_user_error("binder: %d:%d "
1861                                         "BC_FREE_BUFFER u%p matched "
1862                                         "unreturned buffer\n",
1863                                         proc->pid, thread->pid, data_ptr);
1864                                 break;
1865                         }
1866                         if (binder_debug_mask & BINDER_DEBUG_FREE_BUFFER)
1867                                 printk(KERN_INFO "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1868                                        proc->pid, thread->pid, data_ptr, buffer->debug_id,
1869                                        buffer->transaction ? "active" : "finished");
1870
1871                         if (buffer->transaction) {
1872                                 buffer->transaction->buffer = NULL;
1873                                 buffer->transaction = NULL;
1874                         }
1875                         if (buffer->async_transaction && buffer->target_node) {
1876                                 BUG_ON(!buffer->target_node->has_async_transaction);
1877                                 if (list_empty(&buffer->target_node->async_todo))
1878                                         buffer->target_node->has_async_transaction = 0;
1879                                 else
1880                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1881                         }
1882                         binder_transaction_buffer_release(proc, buffer, NULL);
1883                         binder_free_buf(proc, buffer);
1884                         break;
1885                 }
1886
1887                 case BC_TRANSACTION:
1888                 case BC_REPLY: {
1889                         struct binder_transaction_data tr;
1890
1891                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1892                                 return -EFAULT;
1893                         ptr += sizeof(tr);
1894                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1895                         break;
1896                 }
1897
1898                 case BC_REGISTER_LOOPER:
1899                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
1900                                 printk(KERN_INFO "binder: %d:%d BC_REGISTER_LOOPER\n",
1901                                        proc->pid, thread->pid);
1902                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1903                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1904                                 binder_user_error("binder: %d:%d ERROR:"
1905                                         " BC_REGISTER_LOOPER called "
1906                                         "after BC_ENTER_LOOPER\n",
1907                                         proc->pid, thread->pid);
1908                         } else if (proc->requested_threads == 0) {
1909                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1910                                 binder_user_error("binder: %d:%d ERROR:"
1911                                         " BC_REGISTER_LOOPER called "
1912                                         "without request\n",
1913                                         proc->pid, thread->pid);
1914                         } else {
1915                                 proc->requested_threads--;
1916                                 proc->requested_threads_started++;
1917                         }
1918                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1919                         break;
1920                 case BC_ENTER_LOOPER:
1921                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
1922                                 printk(KERN_INFO "binder: %d:%d BC_ENTER_LOOPER\n",
1923                                        proc->pid, thread->pid);
1924                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1925                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1926                                 binder_user_error("binder: %d:%d ERROR:"
1927                                         " BC_ENTER_LOOPER called after "
1928                                         "BC_REGISTER_LOOPER\n",
1929                                         proc->pid, thread->pid);
1930                         }
1931                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1932                         break;
1933                 case BC_EXIT_LOOPER:
1934                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
1935                                 printk(KERN_INFO "binder: %d:%d BC_EXIT_LOOPER\n",
1936                                        proc->pid, thread->pid);
1937                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1938                         break;
1939
1940                 case BC_REQUEST_DEATH_NOTIFICATION:
1941                 case BC_CLEAR_DEATH_NOTIFICATION: {
1942                         uint32_t target;
1943                         void __user *cookie;
1944                         struct binder_ref *ref;
1945                         struct binder_ref_death *death;
1946
1947                         if (get_user(target, (uint32_t __user *)ptr))
1948                                 return -EFAULT;
1949                         ptr += sizeof(uint32_t);
1950                         if (get_user(cookie, (void __user * __user *)ptr))
1951                                 return -EFAULT;
1952                         ptr += sizeof(void *);
1953                         ref = binder_get_ref(proc, target);
1954                         if (ref == NULL) {
1955                                 binder_user_error("binder: %d:%d %s "
1956                                         "invalid ref %d\n",
1957                                         proc->pid, thread->pid,
1958                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1959                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1960                                         "BC_CLEAR_DEATH_NOTIFICATION",
1961                                         target);
1962                                 break;
1963                         }
1964
1965                         if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
1966                                 printk(KERN_INFO "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
1967                                        proc->pid, thread->pid,
1968                                        cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1969                                        "BC_REQUEST_DEATH_NOTIFICATION" :
1970                                        "BC_CLEAR_DEATH_NOTIFICATION",
1971                                        cookie, ref->debug_id, ref->desc,
1972                                        ref->strong, ref->weak, ref->node->debug_id);
1973
1974                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1975                                 if (ref->death) {
1976                                         binder_user_error("binder: %d:%"
1977                                                 "d BC_REQUEST_DEATH_NOTI"
1978                                                 "FICATION death notific"
1979                                                 "ation already set\n",
1980                                                 proc->pid, thread->pid);
1981                                         break;
1982                                 }
1983                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
1984                                 if (death == NULL) {
1985                                         thread->return_error = BR_ERROR;
1986                                         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
1987                                                 printk(KERN_INFO "binder: %d:%d "
1988                                                         "BC_REQUEST_DEATH_NOTIFICATION failed\n",
1989                                                         proc->pid, thread->pid);
1990                                         break;
1991                                 }
1992                                 binder_stats.obj_created[BINDER_STAT_DEATH]++;
1993                                 INIT_LIST_HEAD(&death->work.entry);
1994                                 death->cookie = cookie;
1995                                 ref->death = death;
1996                                 if (ref->node->proc == NULL) {
1997                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
1998                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1999                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2000                                         } else {
2001                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2002                                                 wake_up_interruptible(&proc->wait);
2003                                         }
2004                                 }
2005                         } else {
2006                                 if (ref->death == NULL) {
2007                                         binder_user_error("binder: %d:%"
2008                                                 "d BC_CLEAR_DEATH_NOTIFI"
2009                                                 "CATION death notificat"
2010                                                 "ion not active\n",
2011                                                 proc->pid, thread->pid);
2012                                         break;
2013                                 }
2014                                 death = ref->death;
2015                                 if (death->cookie != cookie) {
2016                                         binder_user_error("binder: %d:%"
2017                                                 "d BC_CLEAR_DEATH_NOTIFI"
2018                                                 "CATION death notificat"
2019                                                 "ion cookie mismatch "
2020                                                 "%p != %p\n",
2021                                                 proc->pid, thread->pid,
2022                                                 death->cookie, cookie);
2023                                         break;
2024                                 }
2025                                 ref->death = NULL;
2026                                 if (list_empty(&death->work.entry)) {
2027                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2028                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2029                                                 list_add_tail(&death->work.entry, &thread->todo);
2030                                         } else {
2031                                                 list_add_tail(&death->work.entry, &proc->todo);
2032                                                 wake_up_interruptible(&proc->wait);
2033                                         }
2034                                 } else {
2035                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2036                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2037                                 }
2038                         }
2039                 } break;
2040                 case BC_DEAD_BINDER_DONE: {
2041                         struct binder_work *w;
2042                         void __user *cookie;
2043                         struct binder_ref_death *death = NULL;
2044                         if (get_user(cookie, (void __user * __user *)ptr))
2045                                 return -EFAULT;
2046
2047                         ptr += sizeof(void *);
2048                         list_for_each_entry(w, &proc->delivered_death, entry) {
2049                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2050                                 if (tmp_death->cookie == cookie) {
2051                                         death = tmp_death;
2052                                         break;
2053                                 }
2054                         }
2055                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
2056                                 printk(KERN_INFO "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2057                                        proc->pid, thread->pid, cookie, death);
2058                         if (death == NULL) {
2059                                 binder_user_error("binder: %d:%d BC_DEAD"
2060                                         "_BINDER_DONE %p not found\n",
2061                                         proc->pid, thread->pid, cookie);
2062                                 break;
2063                         }
2064
2065                         list_del_init(&death->work.entry);
2066                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2067                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2068                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2069                                         list_add_tail(&death->work.entry, &thread->todo);
2070                                 } else {
2071                                         list_add_tail(&death->work.entry, &proc->todo);
2072                                         wake_up_interruptible(&proc->wait);
2073                                 }
2074                         }
2075                 } break;
2076
2077                 default:
2078                         printk(KERN_ERR "binder: %d:%d unknown command %d\n", proc->pid, thread->pid, cmd);
2079                         return -EINVAL;
2080                 }
2081                 *consumed = ptr - buffer;
2082         }
2083         return 0;
2084 }
2085
2086 void
2087 binder_stat_br(struct binder_proc *proc, struct binder_thread *thread, uint32_t cmd)
2088 {
2089         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2090                 binder_stats.br[_IOC_NR(cmd)]++;
2091                 proc->stats.br[_IOC_NR(cmd)]++;
2092                 thread->stats.br[_IOC_NR(cmd)]++;
2093         }
2094 }
2095
2096 static int
2097 binder_has_proc_work(struct binder_proc *proc, struct binder_thread *thread)
2098 {
2099         return !list_empty(&proc->todo) || (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2100 }
2101
2102 static int
2103 binder_has_thread_work(struct binder_thread *thread)
2104 {
2105         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2106                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2107 }
2108
2109 static int
2110 binder_thread_read(struct binder_proc *proc, struct binder_thread *thread,
2111         void  __user *buffer, int size, signed long *consumed, int non_block)
2112 {
2113         void __user *ptr = buffer + *consumed;
2114         void __user *end = buffer + size;
2115
2116         int ret = 0;
2117         int wait_for_proc_work;
2118
2119         if (*consumed == 0) {
2120                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2121                         return -EFAULT;
2122                 ptr += sizeof(uint32_t);
2123         }
2124
2125 retry:
2126         wait_for_proc_work = thread->transaction_stack == NULL && list_empty(&thread->todo);
2127
2128         if (thread->return_error != BR_OK && ptr < end) {
2129                 if (thread->return_error2 != BR_OK) {
2130                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2131                                 return -EFAULT;
2132                         ptr += sizeof(uint32_t);
2133                         if (ptr == end)
2134                                 goto done;
2135                         thread->return_error2 = BR_OK;
2136                 }
2137                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2138                         return -EFAULT;
2139                 ptr += sizeof(uint32_t);
2140                 thread->return_error = BR_OK;
2141                 goto done;
2142         }
2143
2144
2145         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2146         if (wait_for_proc_work)
2147                 proc->ready_threads++;
2148         mutex_unlock(&binder_lock);
2149         if (wait_for_proc_work) {
2150                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2151                                         BINDER_LOOPER_STATE_ENTERED))) {
2152                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
2153                                 "for process work before calling BC_REGISTER_"
2154                                 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2155                                 proc->pid, thread->pid, thread->looper);
2156                         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2157                 }
2158                 binder_set_nice(proc->default_priority);
2159                 if (non_block) {
2160                         if (!binder_has_proc_work(proc, thread))
2161                                 ret = -EAGAIN;
2162                 } else
2163                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2164         } else {
2165                 if (non_block) {
2166                         if (!binder_has_thread_work(thread))
2167                                 ret = -EAGAIN;
2168                 } else
2169                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2170         }
2171         mutex_lock(&binder_lock);
2172         if (wait_for_proc_work)
2173                 proc->ready_threads--;
2174         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2175
2176         if (ret)
2177                 return ret;
2178
2179         while (1) {
2180                 uint32_t cmd;
2181                 struct binder_transaction_data tr;
2182                 struct binder_work *w;
2183                 struct binder_transaction *t = NULL;
2184
2185                 if (!list_empty(&thread->todo))
2186                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2187                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2188                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2189                 else {
2190                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2191                                 goto retry;
2192                         break;
2193                 }
2194
2195                 if (end - ptr < sizeof(tr) + 4)
2196                         break;
2197
2198                 switch (w->type) {
2199                 case BINDER_WORK_TRANSACTION: {
2200                         t = container_of(w, struct binder_transaction, work);
2201                 } break;
2202                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2203                         cmd = BR_TRANSACTION_COMPLETE;
2204                         if (put_user(cmd, (uint32_t __user *)ptr))
2205                                 return -EFAULT;
2206                         ptr += sizeof(uint32_t);
2207
2208                         binder_stat_br(proc, thread, cmd);
2209                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION_COMPLETE)
2210                                 printk(KERN_INFO "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2211                                        proc->pid, thread->pid);
2212
2213                         list_del(&w->entry);
2214                         kfree(w);
2215                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2216                 } break;
2217                 case BINDER_WORK_NODE: {
2218                         struct binder_node *node = container_of(w, struct binder_node, work);
2219                         uint32_t cmd = BR_NOOP;
2220                         const char *cmd_name;
2221                         int strong = node->internal_strong_refs || node->local_strong_refs;
2222                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2223                         if (weak && !node->has_weak_ref) {
2224                                 cmd = BR_INCREFS;
2225                                 cmd_name = "BR_INCREFS";
2226                                 node->has_weak_ref = 1;
2227                                 node->pending_weak_ref = 1;
2228                                 node->local_weak_refs++;
2229                         } else if (strong && !node->has_strong_ref) {
2230                                 cmd = BR_ACQUIRE;
2231                                 cmd_name = "BR_ACQUIRE";
2232                                 node->has_strong_ref = 1;
2233                                 node->pending_strong_ref = 1;
2234                                 node->local_strong_refs++;
2235                         } else if (!strong && node->has_strong_ref) {
2236                                 cmd = BR_RELEASE;
2237                                 cmd_name = "BR_RELEASE";
2238                                 node->has_strong_ref = 0;
2239                         } else if (!weak && node->has_weak_ref) {
2240                                 cmd = BR_DECREFS;
2241                                 cmd_name = "BR_DECREFS";
2242                                 node->has_weak_ref = 0;
2243                         }
2244                         if (cmd != BR_NOOP) {
2245                                 if (put_user(cmd, (uint32_t __user *)ptr))
2246                                         return -EFAULT;
2247                                 ptr += sizeof(uint32_t);
2248                                 if (put_user(node->ptr, (void * __user *)ptr))
2249                                         return -EFAULT;
2250                                 ptr += sizeof(void *);
2251                                 if (put_user(node->cookie, (void * __user *)ptr))
2252                                         return -EFAULT;
2253                                 ptr += sizeof(void *);
2254
2255                                 binder_stat_br(proc, thread, cmd);
2256                                 if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
2257                                         printk(KERN_INFO "binder: %d:%d %s %d u%p c%p\n",
2258                                                proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2259                         } else {
2260                                 list_del_init(&w->entry);
2261                                 if (!weak && !strong) {
2262                                         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
2263                                                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p deleted\n",
2264                                                        proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
2265                                         rb_erase(&node->rb_node, &proc->nodes);
2266                                         kfree(node);
2267                                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2268                                 } else {
2269                                         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
2270                                                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p state unchanged\n",
2271                                                        proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
2272                                 }
2273                         }
2274                 } break;
2275                 case BINDER_WORK_DEAD_BINDER:
2276                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2277                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2278                         struct binder_ref_death *death = container_of(w, struct binder_ref_death, work);
2279                         uint32_t cmd;
2280                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2281                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2282                         else
2283                                 cmd = BR_DEAD_BINDER;
2284                         if (put_user(cmd, (uint32_t __user *)ptr))
2285                                 return -EFAULT;
2286                         ptr += sizeof(uint32_t);
2287                         if (put_user(death->cookie, (void * __user *)ptr))
2288                                 return -EFAULT;
2289                         ptr += sizeof(void *);
2290                         if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
2291                                 printk(KERN_INFO "binder: %d:%d %s %p\n",
2292                                        proc->pid, thread->pid,
2293                                        cmd == BR_DEAD_BINDER ?
2294                                        "BR_DEAD_BINDER" :
2295                                        "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2296                                        death->cookie);
2297
2298                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2299                                 list_del(&w->entry);
2300                                 kfree(death);
2301                                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
2302                         } else
2303                                 list_move(&w->entry, &proc->delivered_death);
2304                         if (cmd == BR_DEAD_BINDER)
2305                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2306                 } break;
2307                 }
2308
2309                 if (!t)
2310                         continue;
2311
2312                 BUG_ON(t->buffer == NULL);
2313                 if (t->buffer->target_node) {
2314                         struct binder_node *target_node = t->buffer->target_node;
2315                         tr.target.ptr = target_node->ptr;
2316                         tr.cookie =  target_node->cookie;
2317                         t->saved_priority = task_nice(current);
2318                         if (t->priority < target_node->min_priority &&
2319                             !(t->flags & TF_ONE_WAY))
2320                                 binder_set_nice(t->priority);
2321                         else if (!(t->flags & TF_ONE_WAY) ||
2322                                  t->saved_priority > target_node->min_priority)
2323                                 binder_set_nice(target_node->min_priority);
2324                         cmd = BR_TRANSACTION;
2325                 } else {
2326                         tr.target.ptr = NULL;
2327                         tr.cookie = NULL;
2328                         cmd = BR_REPLY;
2329                 }
2330                 tr.code = t->code;
2331                 tr.flags = t->flags;
2332                 tr.sender_euid = t->sender_euid;
2333
2334                 if (t->from) {
2335                         struct task_struct *sender = t->from->proc->tsk;
2336                         tr.sender_pid = task_tgid_nr_ns(sender, current->nsproxy->pid_ns);
2337                 } else {
2338                         tr.sender_pid = 0;
2339                 }
2340
2341                 tr.data_size = t->buffer->data_size;
2342                 tr.offsets_size = t->buffer->offsets_size;
2343                 tr.data.ptr.buffer = (void *)((void *)t->buffer->data + proc->user_buffer_offset);
2344                 tr.data.ptr.offsets = tr.data.ptr.buffer + ALIGN(t->buffer->data_size, sizeof(void *));
2345
2346                 if (put_user(cmd, (uint32_t __user *)ptr))
2347                         return -EFAULT;
2348                 ptr += sizeof(uint32_t);
2349                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2350                         return -EFAULT;
2351                 ptr += sizeof(tr);
2352
2353                 binder_stat_br(proc, thread, cmd);
2354                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
2355                         printk(KERN_INFO "binder: %d:%d %s %d %d:%d, cmd %d"
2356                                 "size %zd-%zd ptr %p-%p\n",
2357                                proc->pid, thread->pid,
2358                                (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" : "BR_REPLY",
2359                                t->debug_id, t->from ? t->from->proc->pid : 0,
2360                                t->from ? t->from->pid : 0, cmd,
2361                                t->buffer->data_size, t->buffer->offsets_size,
2362                                tr.data.ptr.buffer, tr.data.ptr.offsets);
2363
2364                 list_del(&t->work.entry);
2365                 t->buffer->allow_user_free = 1;
2366                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2367                         t->to_parent = thread->transaction_stack;
2368                         t->to_thread = thread;
2369                         thread->transaction_stack = t;
2370                 } else {
2371                         t->buffer->transaction = NULL;
2372                         kfree(t);
2373                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
2374                 }
2375                 break;
2376         }
2377
2378 done:
2379
2380         *consumed = ptr - buffer;
2381         if (proc->requested_threads + proc->ready_threads == 0 &&
2382             proc->requested_threads_started < proc->max_threads &&
2383             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2384              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2385              /*spawn a new thread if we leave this out */) {
2386                 proc->requested_threads++;
2387                 if (binder_debug_mask & BINDER_DEBUG_THREADS)
2388                         printk(KERN_INFO "binder: %d:%d BR_SPAWN_LOOPER\n",
2389                                proc->pid, thread->pid);
2390                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2391                         return -EFAULT;
2392         }
2393         return 0;
2394 }
2395
2396 static void binder_release_work(struct list_head *list)
2397 {
2398         struct binder_work *w;
2399         while (!list_empty(list)) {
2400                 w = list_first_entry(list, struct binder_work, entry);
2401                 list_del_init(&w->entry);
2402                 switch (w->type) {
2403                 case BINDER_WORK_TRANSACTION: {
2404                         struct binder_transaction *t = container_of(w, struct binder_transaction, work);
2405                         if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
2406                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2407                 } break;
2408                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2409                         kfree(w);
2410                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2411                 } break;
2412                 default:
2413                         break;
2414                 }
2415         }
2416
2417 }
2418
2419 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2420 {
2421         struct binder_thread *thread = NULL;
2422         struct rb_node *parent = NULL;
2423         struct rb_node **p = &proc->threads.rb_node;
2424
2425         while (*p) {
2426                 parent = *p;
2427                 thread = rb_entry(parent, struct binder_thread, rb_node);
2428
2429                 if (current->pid < thread->pid)
2430                         p = &(*p)->rb_left;
2431                 else if (current->pid > thread->pid)
2432                         p = &(*p)->rb_right;
2433                 else
2434                         break;
2435         }
2436         if (*p == NULL) {
2437                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2438                 if (thread == NULL)
2439                         return NULL;
2440                 binder_stats.obj_created[BINDER_STAT_THREAD]++;
2441                 thread->proc = proc;
2442                 thread->pid = current->pid;
2443                 init_waitqueue_head(&thread->wait);
2444                 INIT_LIST_HEAD(&thread->todo);
2445                 rb_link_node(&thread->rb_node, parent, p);
2446                 rb_insert_color(&thread->rb_node, &proc->threads);
2447                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2448                 thread->return_error = BR_OK;
2449                 thread->return_error2 = BR_OK;
2450         }
2451         return thread;
2452 }
2453
2454 static int binder_free_thread(struct binder_proc *proc, struct binder_thread *thread)
2455 {
2456         struct binder_transaction *t;
2457         struct binder_transaction *send_reply = NULL;
2458         int active_transactions = 0;
2459
2460         rb_erase(&thread->rb_node, &proc->threads);
2461         t = thread->transaction_stack;
2462         if (t && t->to_thread == thread)
2463                 send_reply = t;
2464         while (t) {
2465                 active_transactions++;
2466                 if (binder_debug_mask & BINDER_DEBUG_DEAD_TRANSACTION)
2467                         printk(KERN_INFO "binder: release %d:%d transaction %d %s, still active\n",
2468                                proc->pid, thread->pid, t->debug_id, (t->to_thread == thread) ? "in" : "out");
2469                 if (t->to_thread == thread) {
2470                         t->to_proc = NULL;
2471                         t->to_thread = NULL;
2472                         if (t->buffer) {
2473                                 t->buffer->transaction = NULL;
2474                                 t->buffer = NULL;
2475                         }
2476                         t = t->to_parent;
2477                 } else if (t->from == thread) {
2478                         t->from = NULL;
2479                         t = t->from_parent;
2480                 } else
2481                         BUG();
2482         }
2483         if (send_reply)
2484                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2485         binder_release_work(&thread->todo);
2486         kfree(thread);
2487         binder_stats.obj_deleted[BINDER_STAT_THREAD]++;
2488         return active_transactions;
2489 }
2490
2491 static unsigned int binder_poll(struct file *filp, struct poll_table_struct *wait)
2492 {
2493         struct binder_proc *proc = filp->private_data;
2494         struct binder_thread *thread = NULL;
2495         int wait_for_proc_work;
2496
2497         mutex_lock(&binder_lock);
2498         thread = binder_get_thread(proc);
2499
2500         wait_for_proc_work = thread->transaction_stack == NULL &&
2501                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2502         mutex_unlock(&binder_lock);
2503
2504         if (wait_for_proc_work) {
2505                 if (binder_has_proc_work(proc, thread))
2506                         return POLLIN;
2507                 poll_wait(filp, &proc->wait, wait);
2508                 if (binder_has_proc_work(proc, thread))
2509                         return POLLIN;
2510         } else {
2511                 if (binder_has_thread_work(thread))
2512                         return POLLIN;
2513                 poll_wait(filp, &thread->wait, wait);
2514                 if (binder_has_thread_work(thread))
2515                         return POLLIN;
2516         }
2517         return 0;
2518 }
2519
2520 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2521 {
2522         int ret;
2523         struct binder_proc *proc = filp->private_data;
2524         struct binder_thread *thread;
2525         unsigned int size = _IOC_SIZE(cmd);
2526         void __user *ubuf = (void __user *)arg;
2527
2528         /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2529
2530         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2531         if (ret)
2532                 return ret;
2533
2534         mutex_lock(&binder_lock);
2535         thread = binder_get_thread(proc);
2536         if (thread == NULL) {
2537                 ret = -ENOMEM;
2538                 goto err;
2539         }
2540
2541         switch (cmd) {
2542         case BINDER_WRITE_READ: {
2543                 struct binder_write_read bwr;
2544                 if (size != sizeof(struct binder_write_read)) {
2545                         ret = -EINVAL;
2546                         goto err;
2547                 }
2548                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2549                         ret = -EFAULT;
2550                         goto err;
2551                 }
2552                 if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
2553                         printk(KERN_INFO "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2554                                proc->pid, thread->pid, bwr.write_size, bwr.write_buffer, bwr.read_size, bwr.read_buffer);
2555                 if (bwr.write_size > 0) {
2556                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2557                         if (ret < 0) {
2558                                 bwr.read_consumed = 0;
2559                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2560                                         ret = -EFAULT;
2561                                 goto err;
2562                         }
2563                 }
2564                 if (bwr.read_size > 0) {
2565                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2566                         if (!list_empty(&proc->todo))
2567                                 wake_up_interruptible(&proc->wait);
2568                         if (ret < 0) {
2569                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2570                                         ret = -EFAULT;
2571                                 goto err;
2572                         }
2573                 }
2574                 if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
2575                         printk(KERN_INFO "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2576                                proc->pid, thread->pid, bwr.write_consumed, bwr.write_size, bwr.read_consumed, bwr.read_size);
2577                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2578                         ret = -EFAULT;
2579                         goto err;
2580                 }
2581                 break;
2582         }
2583         case BINDER_SET_MAX_THREADS:
2584                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2585                         ret = -EINVAL;
2586                         goto err;
2587                 }
2588                 break;
2589         case BINDER_SET_CONTEXT_MGR:
2590                 if (binder_context_mgr_node != NULL) {
2591                         printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set\n");
2592                         ret = -EBUSY;
2593                         goto err;
2594                 }
2595                 if (binder_context_mgr_uid != -1) {
2596                         if (binder_context_mgr_uid != current->cred->euid) {
2597                                 printk(KERN_ERR "binder: BINDER_SET_"
2598                                        "CONTEXT_MGR bad uid %d != %d\n",
2599                                        current->cred->euid,
2600                                        binder_context_mgr_uid);
2601                                 ret = -EPERM;
2602                                 goto err;
2603                         }
2604                 } else
2605                         binder_context_mgr_uid = current->cred->euid;
2606                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2607                 if (binder_context_mgr_node == NULL) {
2608                         ret = -ENOMEM;
2609                         goto err;
2610                 }
2611                 binder_context_mgr_node->local_weak_refs++;
2612                 binder_context_mgr_node->local_strong_refs++;
2613                 binder_context_mgr_node->has_strong_ref = 1;
2614                 binder_context_mgr_node->has_weak_ref = 1;
2615                 break;
2616         case BINDER_THREAD_EXIT:
2617                 if (binder_debug_mask & BINDER_DEBUG_THREADS)
2618                         printk(KERN_INFO "binder: %d:%d exit\n",
2619                                proc->pid, thread->pid);
2620                 binder_free_thread(proc, thread);
2621                 thread = NULL;
2622                 break;
2623         case BINDER_VERSION:
2624                 if (size != sizeof(struct binder_version)) {
2625                         ret = -EINVAL;
2626                         goto err;
2627                 }
2628                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2629                         ret = -EINVAL;
2630                         goto err;
2631                 }
2632                 break;
2633         default:
2634                 ret = -EINVAL;
2635                 goto err;
2636         }
2637         ret = 0;
2638 err:
2639         if (thread)
2640                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2641         mutex_unlock(&binder_lock);
2642         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2643         if (ret && ret != -ERESTARTSYS)
2644                 printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2645         return ret;
2646 }
2647
2648 static void binder_vma_open(struct vm_area_struct *vma)
2649 {
2650         struct binder_proc *proc = vma->vm_private_data;
2651         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2652                 printk(KERN_INFO "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, vma->vm_page_prot.pgprot);
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 "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, vma->vm_page_prot.pgprot);
2660         proc->vma = NULL;
2661 }
2662
2663 static struct vm_operations_struct binder_vm_ops = {
2664         .open = binder_vma_open,
2665         .close = binder_vma_close,
2666 };
2667
2668 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2669 {
2670         int ret;
2671         struct vm_struct *area;
2672         struct binder_proc *proc = filp->private_data;
2673         const char *failure_string;
2674         struct binder_buffer *buffer;
2675
2676         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2677                 vma->vm_end = vma->vm_start + SZ_4M;
2678
2679         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2680                 printk(KERN_INFO "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, vma->vm_page_prot.pgprot);
2681
2682         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2683                 ret = -EPERM;
2684                 failure_string = "bad vm_flags";
2685                 goto err_bad_arg;
2686         }
2687         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2688
2689         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2690         if (area == NULL) {
2691                 ret = -ENOMEM;
2692                 failure_string = "get_vm_area";
2693                 goto err_get_vm_area_failed;
2694         }
2695         proc->buffer = area->addr;
2696         proc->user_buffer_offset = vma->vm_start - (size_t)proc->buffer;
2697
2698 #ifdef CONFIG_CPU_CACHE_VIPT
2699         if (cache_is_vipt_aliasing()) {
2700                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2701                         printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2702                         vma->vm_start += PAGE_SIZE;
2703                 }
2704         }
2705 #endif
2706         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2707         if (proc->pages == NULL) {
2708                 ret = -ENOMEM;
2709                 failure_string = "alloc page array";
2710                 goto err_alloc_pages_failed;
2711         }
2712         proc->buffer_size = vma->vm_end - vma->vm_start;
2713
2714         vma->vm_ops = &binder_vm_ops;
2715         vma->vm_private_data = proc;
2716
2717         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2718                 ret = -ENOMEM;
2719                 failure_string = "alloc small buf";
2720                 goto err_alloc_small_buf_failed;
2721         }
2722         buffer = proc->buffer;
2723         INIT_LIST_HEAD(&proc->buffers);
2724         list_add(&buffer->entry, &proc->buffers);
2725         buffer->free = 1;
2726         binder_insert_free_buffer(proc, buffer);
2727         proc->free_async_space = proc->buffer_size / 2;
2728         barrier();
2729         proc->vma = vma;
2730
2731         /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2732         return 0;
2733
2734 err_alloc_small_buf_failed:
2735         kfree(proc->pages);
2736 err_alloc_pages_failed:
2737         vfree(proc->buffer);
2738 err_get_vm_area_failed:
2739         mutex_unlock(&binder_lock);
2740 err_bad_arg:
2741         printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n", proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2742         return ret;
2743 }
2744
2745 static int binder_open(struct inode *nodp, struct file *filp)
2746 {
2747         struct binder_proc *proc;
2748
2749         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2750                 printk(KERN_INFO "binder_open: %d:%d\n", current->group_leader->pid, current->pid);
2751
2752         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2753         if (proc == NULL)
2754                 return -ENOMEM;
2755         get_task_struct(current);
2756         proc->tsk = current;
2757         INIT_LIST_HEAD(&proc->todo);
2758         init_waitqueue_head(&proc->wait);
2759         proc->default_priority = task_nice(current);
2760         mutex_lock(&binder_lock);
2761         binder_stats.obj_created[BINDER_STAT_PROC]++;
2762         hlist_add_head(&proc->proc_node, &binder_procs);
2763         proc->pid = current->group_leader->pid;
2764         INIT_LIST_HEAD(&proc->delivered_death);
2765         filp->private_data = proc;
2766         mutex_unlock(&binder_lock);
2767
2768         if (binder_proc_dir_entry_proc) {
2769                 char strbuf[11];
2770                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2771                 create_proc_read_entry(strbuf, S_IRUGO, binder_proc_dir_entry_proc, binder_read_proc_proc, proc);
2772         }
2773
2774         return 0;
2775 }
2776
2777 static int binder_flush(struct file *filp, fl_owner_t id)
2778 {
2779         struct rb_node *n;
2780         struct binder_proc *proc = filp->private_data;
2781         int wake_count = 0;
2782
2783         mutex_lock(&binder_lock);
2784         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2785                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2786                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2787                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2788                         wake_up_interruptible(&thread->wait);
2789                         wake_count++;
2790                 }
2791         }
2792         wake_up_interruptible_all(&proc->wait);
2793         mutex_unlock(&binder_lock);
2794
2795         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2796                 printk(KERN_INFO "binder_flush: %d woke %d threads\n", proc->pid, wake_count);
2797
2798         return 0;
2799 }
2800
2801 static int binder_release(struct inode *nodp, struct file *filp)
2802 {
2803         struct hlist_node *pos;
2804         struct binder_transaction *t;
2805         struct rb_node *n;
2806         struct binder_proc *proc = filp->private_data;
2807         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2808
2809         if (binder_proc_dir_entry_proc) {
2810                 char strbuf[11];
2811                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2812                 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2813         }
2814         mutex_lock(&binder_lock);
2815         hlist_del(&proc->proc_node);
2816         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2817                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
2818                         printk(KERN_INFO "binder_release: %d context_mgr_node gone\n", proc->pid);
2819                 binder_context_mgr_node = NULL;
2820         }
2821
2822         threads = 0;
2823         active_transactions = 0;
2824         while ((n = rb_first(&proc->threads))) {
2825                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2826                 threads++;
2827                 active_transactions += binder_free_thread(proc, thread);
2828         }
2829         nodes = 0;
2830         incoming_refs = 0;
2831         while ((n = rb_first(&proc->nodes))) {
2832                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2833
2834                 nodes++;
2835                 rb_erase(&node->rb_node, &proc->nodes);
2836                 list_del_init(&node->work.entry);
2837                 if (hlist_empty(&node->refs)) {
2838                         kfree(node);
2839                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2840                 } else {
2841                         struct binder_ref *ref;
2842                         int death = 0;
2843
2844                         node->proc = NULL;
2845                         node->local_strong_refs = 0;
2846                         node->local_weak_refs = 0;
2847                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2848
2849                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2850                                 incoming_refs++;
2851                                 if (ref->death) {
2852                                         death++;
2853                                         if (list_empty(&ref->death->work.entry)) {
2854                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2855                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2856                                                 wake_up_interruptible(&ref->proc->wait);
2857                                         } else
2858                                                 BUG();
2859                                 }
2860                         }
2861                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
2862                                 printk(KERN_INFO "binder: node %d now dead, refs %d, death %d\n", node->debug_id, incoming_refs, death);
2863                 }
2864         }
2865         outgoing_refs = 0;
2866         while ((n = rb_first(&proc->refs_by_desc))) {
2867                 struct binder_ref *ref = rb_entry(n, struct binder_ref, rb_node_desc);
2868                 outgoing_refs++;
2869                 binder_delete_ref(ref);
2870         }
2871         binder_release_work(&proc->todo);
2872         buffers = 0;
2873
2874         while ((n = rb_first(&proc->allocated_buffers))) {
2875                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer, rb_node);
2876                 t = buffer->transaction;
2877                 if (t) {
2878                         t->buffer = NULL;
2879                         buffer->transaction = NULL;
2880                         printk(KERN_ERR "binder: release proc %d, transaction %d, not freed\n", proc->pid, t->debug_id);
2881                         /*BUG();*/
2882                 }
2883                 binder_free_buf(proc, buffer);
2884                 buffers++;
2885         }
2886
2887         binder_stats.obj_deleted[BINDER_STAT_PROC]++;
2888         mutex_unlock(&binder_lock);
2889
2890         page_count = 0;
2891         if (proc->pages) {
2892                 int i;
2893                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
2894                         if (proc->pages[i]) {
2895                                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
2896                                         printk(KERN_INFO "binder_release: %d: page %d at %p not freed\n", proc->pid, i, proc->buffer + i * PAGE_SIZE);
2897                                 __free_page(proc->pages[i]);
2898                                 page_count++;
2899                         }
2900                 }
2901                 kfree(proc->pages);
2902                 vfree(proc->buffer);
2903         }
2904
2905         put_task_struct(proc->tsk);
2906
2907         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
2908                 printk(KERN_INFO "binder_release: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
2909                        proc->pid, threads, nodes, incoming_refs, outgoing_refs, active_transactions, buffers, page_count);
2910
2911         kfree(proc);
2912         return 0;
2913 }
2914
2915 static char *print_binder_transaction(char *buf, char *end, const char *prefix, struct binder_transaction *t)
2916 {
2917         buf += snprintf(buf, end - buf, "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
2918                         prefix, t->debug_id, t, t->from ? t->from->proc->pid : 0,
2919                         t->from ? t->from->pid : 0,
2920                         t->to_proc ? t->to_proc->pid : 0,
2921                         t->to_thread ? t->to_thread->pid : 0,
2922                         t->code, t->flags, t->priority, t->need_reply);
2923         if (buf >= end)
2924                 return buf;
2925         if (t->buffer == NULL) {
2926                 buf += snprintf(buf, end - buf, " buffer free\n");
2927                 return buf;
2928         }
2929         if (t->buffer->target_node) {
2930                 buf += snprintf(buf, end - buf, " node %d",
2931                                 t->buffer->target_node->debug_id);
2932                 if (buf >= end)
2933                         return buf;
2934         }
2935         buf += snprintf(buf, end - buf, " size %zd:%zd data %p\n",
2936                         t->buffer->data_size, t->buffer->offsets_size,
2937                         t->buffer->data);
2938         return buf;
2939 }
2940
2941 static char *print_binder_buffer(char *buf, char *end, const char *prefix, struct binder_buffer *buffer)
2942 {
2943         buf += snprintf(buf, end - buf, "%s %d: %p size %zd:%zd %s\n",
2944                         prefix, buffer->debug_id, buffer->data,
2945                         buffer->data_size, buffer->offsets_size,
2946                         buffer->transaction ? "active" : "delivered");
2947         return buf;
2948 }
2949
2950 static char *print_binder_work(char *buf, char *end, const char *prefix,
2951         const char *transaction_prefix, struct binder_work *w)
2952 {
2953         struct binder_node *node;
2954         struct binder_transaction *t;
2955
2956         switch (w->type) {
2957         case BINDER_WORK_TRANSACTION:
2958                 t = container_of(w, struct binder_transaction, work);
2959                 buf = print_binder_transaction(buf, end, transaction_prefix, t);
2960                 break;
2961         case BINDER_WORK_TRANSACTION_COMPLETE:
2962                 buf += snprintf(buf, end - buf,
2963                                 "%stransaction complete\n", prefix);
2964                 break;
2965         case BINDER_WORK_NODE:
2966                 node = container_of(w, struct binder_node, work);
2967                 buf += snprintf(buf, end - buf, "%snode work %d: u%p c%p\n",
2968                                 prefix, node->debug_id, node->ptr, node->cookie);
2969                 break;
2970         case BINDER_WORK_DEAD_BINDER:
2971                 buf += snprintf(buf, end - buf, "%shas dead binder\n", prefix);
2972                 break;
2973         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2974                 buf += snprintf(buf, end - buf,
2975                                 "%shas cleared dead binder\n", prefix);
2976                 break;
2977         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
2978                 buf += snprintf(buf, end - buf,
2979                                 "%shas cleared death notification\n", prefix);
2980                 break;
2981         default:
2982                 buf += snprintf(buf, end - buf, "%sunknown work: type %d\n",
2983                                 prefix, w->type);
2984                 break;
2985         }
2986         return buf;
2987 }
2988
2989 static char *print_binder_thread(char *buf, char *end, struct binder_thread *thread, int print_always)
2990 {
2991         struct binder_transaction *t;
2992         struct binder_work *w;
2993         char *start_buf = buf;
2994         char *header_buf;
2995
2996         buf += snprintf(buf, end - buf, "  thread %d: l %02x\n", thread->pid, thread->looper);
2997         header_buf = buf;
2998         t = thread->transaction_stack;
2999         while (t) {
3000                 if (buf >= end)
3001                         break;
3002                 if (t->from == thread) {
3003                         buf = print_binder_transaction(buf, end, "    outgoing transaction", t);
3004                         t = t->from_parent;
3005                 } else if (t->to_thread == thread) {
3006                         buf = print_binder_transaction(buf, end, "    incoming transaction", t);
3007                         t = t->to_parent;
3008                 } else {
3009                         buf = print_binder_transaction(buf, end, "    bad transaction", t);
3010                         t = NULL;
3011                 }
3012         }
3013         list_for_each_entry(w, &thread->todo, entry) {
3014                 if (buf >= end)
3015                         break;
3016                 buf = print_binder_work(buf, end, "    ",
3017                                         "    pending transaction", w);
3018         }
3019         if (!print_always && buf == header_buf)
3020                 buf = start_buf;
3021         return buf;
3022 }
3023
3024 static char *print_binder_node(char *buf, char *end, struct binder_node *node)
3025 {
3026         struct binder_ref *ref;
3027         struct hlist_node *pos;
3028         struct binder_work *w;
3029         int count;
3030         count = 0;
3031         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3032                 count++;
3033
3034         buf += snprintf(buf, end - buf, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3035                         node->debug_id, node->ptr, node->cookie,
3036                         node->has_strong_ref, node->has_weak_ref,
3037                         node->local_strong_refs, node->local_weak_refs,
3038                         node->internal_strong_refs, count);
3039         if (buf >= end)
3040                 return buf;
3041         if (count) {
3042                 buf += snprintf(buf, end - buf, " proc");
3043                 if (buf >= end)
3044                         return buf;
3045                 hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
3046                         buf += snprintf(buf, end - buf, " %d", ref->proc->pid);
3047                         if (buf >= end)
3048                                 return buf;
3049                 }
3050         }
3051         buf += snprintf(buf, end - buf, "\n");
3052         list_for_each_entry(w, &node->async_todo, entry) {
3053                 if (buf >= end)
3054                         break;
3055                 buf = print_binder_work(buf, end, "    ",
3056                                         "    pending async transaction", w);
3057         }
3058         return buf;
3059 }
3060
3061 static char *print_binder_ref(char *buf, char *end, struct binder_ref *ref)
3062 {
3063         buf += snprintf(buf, end - buf, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3064                         ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3065                         ref->node->debug_id, ref->strong, ref->weak, ref->death);
3066         return buf;
3067 }
3068
3069 static char *print_binder_proc(char *buf, char *end, struct binder_proc *proc, int print_all)
3070 {
3071         struct binder_work *w;
3072         struct rb_node *n;
3073         char *start_buf = buf;
3074         char *header_buf;
3075
3076         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3077         header_buf = buf;
3078
3079         for (n = rb_first(&proc->threads); n != NULL && buf < end; n = rb_next(n))
3080                 buf = print_binder_thread(buf, end, rb_entry(n, struct binder_thread, rb_node), print_all);
3081         for (n = rb_first(&proc->nodes); n != NULL && buf < end; n = rb_next(n)) {
3082                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
3083                 if (print_all || node->has_async_transaction)
3084                         buf = print_binder_node(buf, end, node);
3085         }
3086         if (print_all) {
3087                 for (n = rb_first(&proc->refs_by_desc); n != NULL && buf < end; n = rb_next(n))
3088                         buf = print_binder_ref(buf, end, rb_entry(n, struct binder_ref, rb_node_desc));
3089         }
3090         for (n = rb_first(&proc->allocated_buffers); n != NULL && buf < end; n = rb_next(n))
3091                 buf = print_binder_buffer(buf, end, "  buffer", rb_entry(n, struct binder_buffer, rb_node));
3092         list_for_each_entry(w, &proc->todo, entry) {
3093                 if (buf >= end)
3094                         break;
3095                 buf = print_binder_work(buf, end, "  ",
3096                                         "  pending transaction", w);
3097         }
3098         list_for_each_entry(w, &proc->delivered_death, entry) {
3099                 if (buf >= end)
3100                         break;
3101                 buf += snprintf(buf, end - buf, "  has delivered dead binder\n");
3102                 break;
3103         }
3104         if (!print_all && buf == header_buf)
3105                 buf = start_buf;
3106         return buf;
3107 }
3108
3109 static const char *binder_return_strings[] = {
3110         "BR_ERROR",
3111         "BR_OK",
3112         "BR_TRANSACTION",
3113         "BR_REPLY",
3114         "BR_ACQUIRE_RESULT",
3115         "BR_DEAD_REPLY",
3116         "BR_TRANSACTION_COMPLETE",
3117         "BR_INCREFS",
3118         "BR_ACQUIRE",
3119         "BR_RELEASE",
3120         "BR_DECREFS",
3121         "BR_ATTEMPT_ACQUIRE",
3122         "BR_NOOP",
3123         "BR_SPAWN_LOOPER",
3124         "BR_FINISHED",
3125         "BR_DEAD_BINDER",
3126         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3127         "BR_FAILED_REPLY"
3128 };
3129
3130 static const char *binder_command_strings[] = {
3131         "BC_TRANSACTION",
3132         "BC_REPLY",
3133         "BC_ACQUIRE_RESULT",
3134         "BC_FREE_BUFFER",
3135         "BC_INCREFS",
3136         "BC_ACQUIRE",
3137         "BC_RELEASE",
3138         "BC_DECREFS",
3139         "BC_INCREFS_DONE",
3140         "BC_ACQUIRE_DONE",
3141         "BC_ATTEMPT_ACQUIRE",
3142         "BC_REGISTER_LOOPER",
3143         "BC_ENTER_LOOPER",
3144         "BC_EXIT_LOOPER",
3145         "BC_REQUEST_DEATH_NOTIFICATION",
3146         "BC_CLEAR_DEATH_NOTIFICATION",
3147         "BC_DEAD_BINDER_DONE"
3148 };
3149
3150 static const char *binder_objstat_strings[] = {
3151         "proc",
3152         "thread",
3153         "node",
3154         "ref",
3155         "death",
3156         "transaction",
3157         "transaction_complete"
3158 };
3159
3160 static char *print_binder_stats(char *buf, char *end, const char *prefix, struct binder_stats *stats)
3161 {
3162         int i;
3163
3164         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) != ARRAY_SIZE(binder_command_strings));
3165         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3166                 if (stats->bc[i])
3167                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3168                                         binder_command_strings[i], stats->bc[i]);
3169                 if (buf >= end)
3170                         return buf;
3171         }
3172
3173         BUILD_BUG_ON(ARRAY_SIZE(stats->br) != ARRAY_SIZE(binder_return_strings));
3174         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3175                 if (stats->br[i])
3176                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3177                                         binder_return_strings[i], stats->br[i]);
3178                 if (buf >= end)
3179                         return buf;
3180         }
3181
3182         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != ARRAY_SIZE(binder_objstat_strings));
3183         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != ARRAY_SIZE(stats->obj_deleted));
3184         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3185                 if (stats->obj_created[i] || stats->obj_deleted[i])
3186                         buf += snprintf(buf, end - buf, "%s%s: active %d total %d\n", prefix,
3187                                         binder_objstat_strings[i],
3188                                         stats->obj_created[i] - stats->obj_deleted[i],
3189                                         stats->obj_created[i]);
3190                 if (buf >= end)
3191                         return buf;
3192         }
3193         return buf;
3194 }
3195
3196 static char *print_binder_proc_stats(char *buf, char *end, struct binder_proc *proc)
3197 {
3198         struct binder_work *w;
3199         struct rb_node *n;
3200         int count, strong, weak;
3201
3202         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3203         if (buf >= end)
3204                 return buf;
3205         count = 0;
3206         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3207                 count++;
3208         buf += snprintf(buf, end - buf, "  threads: %d\n", count);
3209         if (buf >= end)
3210                 return buf;
3211         buf += snprintf(buf, end - buf, "  requested threads: %d+%d/%d\n"
3212                         "  ready threads %d\n"
3213                         "  free async space %zd\n", proc->requested_threads,
3214                         proc->requested_threads_started, proc->max_threads,
3215                         proc->ready_threads, proc->free_async_space);
3216         if (buf >= end)
3217                 return buf;
3218         count = 0;
3219         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3220                 count++;
3221         buf += snprintf(buf, end - buf, "  nodes: %d\n", count);
3222         if (buf >= end)
3223                 return buf;
3224         count = 0;
3225         strong = 0;
3226         weak = 0;
3227         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3228                 struct binder_ref *ref = rb_entry(n, struct binder_ref, rb_node_desc);
3229                 count++;
3230                 strong += ref->strong;
3231                 weak += ref->weak;
3232         }
3233         buf += snprintf(buf, end - buf, "  refs: %d s %d w %d\n", count, strong, weak);
3234         if (buf >= end)
3235                 return buf;
3236
3237         count = 0;
3238         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3239                 count++;
3240         buf += snprintf(buf, end - buf, "  buffers: %d\n", count);
3241         if (buf >= end)
3242                 return buf;
3243
3244         count = 0;
3245         list_for_each_entry(w, &proc->todo, entry) {
3246                 switch (w->type) {
3247                 case BINDER_WORK_TRANSACTION:
3248                         count++;
3249                         break;
3250                 default:
3251                         break;
3252                 }
3253         }
3254         buf += snprintf(buf, end - buf, "  pending transactions: %d\n", count);
3255         if (buf >= end)
3256                 return buf;
3257
3258         buf = print_binder_stats(buf, end, "  ", &proc->stats);
3259
3260         return buf;
3261 }
3262
3263
3264 static int binder_read_proc_state(
3265         char *page, char **start, off_t off, int count, int *eof, void *data)
3266 {
3267         struct binder_proc *proc;
3268         struct hlist_node *pos;
3269         struct binder_node *node;
3270         int len = 0;
3271         char *buf = page;
3272         char *end = page + PAGE_SIZE;
3273         int do_lock = !binder_debug_no_lock;
3274
3275         if (off)
3276                 return 0;
3277
3278         if (do_lock)
3279                 mutex_lock(&binder_lock);
3280
3281         buf += snprintf(buf, end - buf, "binder state:\n");
3282
3283         if (!hlist_empty(&binder_dead_nodes))
3284                 buf += snprintf(buf, end - buf, "dead nodes:\n");
3285         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) {
3286                 if (buf >= end)
3287                         break;
3288                 buf = print_binder_node(buf, end, node);
3289         }
3290
3291         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3292                 if (buf >= end)
3293                         break;
3294                 buf = print_binder_proc(buf, end, proc, 1);
3295         }
3296         if (do_lock)
3297                 mutex_unlock(&binder_lock);
3298         if (buf > page + PAGE_SIZE)
3299                 buf = page + PAGE_SIZE;
3300
3301         *start = page + off;
3302
3303         len = buf - page;
3304         if (len > off)
3305                 len -= off;
3306         else
3307                 len = 0;
3308
3309         return len < count ? len  : count;
3310 }
3311
3312 static int binder_read_proc_stats(
3313         char *page, char **start, off_t off, int count, int *eof, void *data)
3314 {
3315         struct binder_proc *proc;
3316         struct hlist_node *pos;
3317         int len = 0;
3318         char *p = page;
3319         int do_lock = !binder_debug_no_lock;
3320
3321         if (off)
3322                 return 0;
3323
3324         if (do_lock)
3325                 mutex_lock(&binder_lock);
3326
3327         p += snprintf(p, PAGE_SIZE, "binder stats:\n");
3328
3329         p = print_binder_stats(p, page + PAGE_SIZE, "", &binder_stats);
3330
3331         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3332                 if (p >= page + PAGE_SIZE)
3333                         break;
3334                 p = print_binder_proc_stats(p, page + PAGE_SIZE, proc);
3335         }
3336         if (do_lock)
3337                 mutex_unlock(&binder_lock);
3338         if (p > page + PAGE_SIZE)
3339                 p = page + PAGE_SIZE;
3340
3341         *start = page + off;
3342
3343         len = p - page;
3344         if (len > off)
3345                 len -= off;
3346         else
3347                 len = 0;
3348
3349         return len < count ? len  : count;
3350 }
3351
3352 static int binder_read_proc_transactions(
3353         char *page, char **start, off_t off, int count, int *eof, void *data)
3354 {
3355         struct binder_proc *proc;
3356         struct hlist_node *pos;
3357         int len = 0;
3358         char *buf = page;
3359         char *end = page + PAGE_SIZE;
3360         int do_lock = !binder_debug_no_lock;
3361
3362         if (off)
3363                 return 0;
3364
3365         if (do_lock)
3366                 mutex_lock(&binder_lock);
3367
3368         buf += snprintf(buf, end - buf, "binder transactions:\n");
3369         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3370                 if (buf >= end)
3371                         break;
3372                 buf = print_binder_proc(buf, end, proc, 0);
3373         }
3374         if (do_lock)
3375                 mutex_unlock(&binder_lock);
3376         if (buf > page + PAGE_SIZE)
3377                 buf = page + PAGE_SIZE;
3378
3379         *start = page + off;
3380
3381         len = buf - page;
3382         if (len > off)
3383                 len -= off;
3384         else
3385                 len = 0;
3386
3387         return len < count ? len  : count;
3388 }
3389
3390 static int binder_read_proc_proc(
3391         char *page, char **start, off_t off, int count, int *eof, void *data)
3392 {
3393         struct binder_proc *proc = data;
3394         int len = 0;
3395         char *p = page;
3396         int do_lock = !binder_debug_no_lock;
3397
3398         if (off)
3399                 return 0;
3400
3401         if (do_lock)
3402                 mutex_lock(&binder_lock);
3403         p += snprintf(p, PAGE_SIZE, "binder proc state:\n");
3404         p = print_binder_proc(p, page + PAGE_SIZE, proc, 1);
3405         if (do_lock)
3406                 mutex_unlock(&binder_lock);
3407
3408         if (p > page + PAGE_SIZE)
3409                 p = page + PAGE_SIZE;
3410         *start = page + off;
3411
3412         len = p - page;
3413         if (len > off)
3414                 len -= off;
3415         else
3416                 len = 0;
3417
3418         return len < count ? len  : count;
3419 }
3420
3421 static char *print_binder_transaction_log_entry(char *buf, char *end, struct binder_transaction_log_entry *e)
3422 {
3423         buf += snprintf(buf, end - buf, "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3424                         e->debug_id, (e->call_type == 2) ? "reply" :
3425                         ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3426                         e->from_thread, e->to_proc, e->to_thread, e->to_node,
3427                         e->target_handle, e->data_size, e->offsets_size);
3428         return buf;
3429 }
3430
3431 static int binder_read_proc_transaction_log(
3432         char *page, char **start, off_t off, int count, int *eof, void *data)
3433 {
3434         struct binder_transaction_log *log = data;
3435         int len = 0;
3436         int i;
3437         char *buf = page;
3438         char *end = page + PAGE_SIZE;
3439
3440         if (off)
3441                 return 0;
3442
3443         if (log->full) {
3444                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++) {
3445                         if (buf >= end)
3446                                 break;
3447                         buf = print_binder_transaction_log_entry(buf, end, &log->entry[i]);
3448                 }
3449         }
3450         for (i = 0; i < log->next; i++) {
3451                 if (buf >= end)
3452                         break;
3453                 buf = print_binder_transaction_log_entry(buf, end, &log->entry[i]);
3454         }
3455
3456         *start = page + off;
3457
3458         len = buf - page;
3459         if (len > off)
3460                 len -= off;
3461         else
3462                 len = 0;
3463
3464         return len < count ? len  : count;
3465 }
3466
3467 static struct file_operations binder_fops = {
3468         .owner = THIS_MODULE,
3469         .poll = binder_poll,
3470         .unlocked_ioctl = binder_ioctl,
3471         .mmap = binder_mmap,
3472         .open = binder_open,
3473         .flush = binder_flush,
3474         .release = binder_release,
3475 };
3476
3477 static struct miscdevice binder_miscdev = {
3478         .minor = MISC_DYNAMIC_MINOR,
3479         .name = "binder",
3480         .fops = &binder_fops
3481 };
3482
3483 static int __init binder_init(void)
3484 {
3485         int ret;
3486
3487         binder_proc_dir_entry_root = proc_mkdir("binder", NULL);
3488         if (binder_proc_dir_entry_root)
3489                 binder_proc_dir_entry_proc = proc_mkdir("proc", binder_proc_dir_entry_root);
3490         ret = misc_register(&binder_miscdev);
3491         if (binder_proc_dir_entry_root) {
3492                 create_proc_read_entry("state", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_state, NULL);
3493                 create_proc_read_entry("stats", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_stats, NULL);
3494                 create_proc_read_entry("transactions", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transactions, NULL);
3495                 create_proc_read_entry("transaction_log", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transaction_log, &binder_transaction_log);
3496                 create_proc_read_entry("failed_transaction_log", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transaction_log, &binder_transaction_log_failed);
3497         }
3498         return ret;
3499 }
3500
3501 device_initcall(binder_init);
3502
3503 MODULE_LICENSE("GPL v2");