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   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <asm/cacheflush.h>
  19 #include <linux/fdtable.h>
  20 #include <linux/file.h>
  21 #include <linux/fs.h>
  22 #include <linux/list.h>
  23 #include <linux/miscdevice.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/mutex.h>
  27 #include <linux/nsproxy.h>
  28 #include <linux/poll.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/rbtree.h>
  31 #include <linux/sched.h>
  32 #include <linux/uaccess.h>
  33 #include <linux/vmalloc.h>
  34 #include "binder.h"
  35
  36 static DEFINE_MUTEX(binder_lock);
  37 static HLIST_HEAD(binder_procs);
  38 static struct binder_node *binder_context_mgr_node;
  39 static uid_t binder_context_mgr_uid = -1;
  40 static int binder_last_id;
  41 static struct proc_dir_entry *binder_proc_dir_entry_root;
  42 static struct proc_dir_entry *binder_proc_dir_entry_proc;
  43 static struct hlist_head binder_dead_nodes;
  44 static HLIST_HEAD(binder_deferred_list);
  45 static DEFINE_MUTEX(binder_deferred_lock);
  46
  47 static int binder_read_proc_proc(char *page, char **start, off_t off,
  48                                  int count, int *eof, void *data);
  49
  50 /* This is only defined in include/asm-arm/sizes.h */
  51 #ifndef SZ_1K
  52 #define SZ_1K                               0x400
  53 #endif
  54
  55 #ifndef SZ_4M
  56 #define SZ_4M                               0x400000
  57 #endif
  58
  59 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  60
  61 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  62
  63 enum {
  64         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  65         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  66         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  67         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  68         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  69         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
  70         BINDER_DEBUG_READ_WRITE             = 1U << 6,
  71         BINDER_DEBUG_USER_REFS              = 1U << 7,
  72         BINDER_DEBUG_THREADS                = 1U << 8,
  73         BINDER_DEBUG_TRANSACTION            = 1U << 9,
  74         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
  75         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
  76         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
  77         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
  78         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
  79         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
  80 };
  81 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
  82         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
  83 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
  84
  85 static int binder_debug_no_lock;
  86 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
  87
  88 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
  89 static int binder_stop_on_user_error;
  90
  91 static int binder_set_stop_on_user_error(const char *val,
  92                                          struct kernel_param *kp)
  93 {
  94         int ret;
  95         ret = param_set_int(val, kp);
  96         if (binder_stop_on_user_error < 2)
  97                 wake_up(&binder_user_error_wait);
  98         return ret;
  99 }
 100 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 101         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 102
 103 #define binder_debug(mask, x...) \
 104         do { \
 105                 if (binder_debug_mask & mask) \
 106                         printk(KERN_INFO x); \
 107         } while (0)
 108
 109 #define binder_user_error(x...) \
 110         do { \
 111                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 112                         printk(KERN_INFO x); \
 113                 if (binder_stop_on_user_error) \
 114                         binder_stop_on_user_error = 2; \
 115         } while (0)
 116
 117 enum {
 118         BINDER_STAT_PROC,
 119         BINDER_STAT_THREAD,
 120         BINDER_STAT_NODE,
 121         BINDER_STAT_REF,
 122         BINDER_STAT_DEATH,
 123         BINDER_STAT_TRANSACTION,
 124         BINDER_STAT_TRANSACTION_COMPLETE,
 125         BINDER_STAT_COUNT
 126 };
 127
 128 struct binder_stats {
 129         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 130         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 131         int obj_created[BINDER_STAT_COUNT];
 132         int obj_deleted[BINDER_STAT_COUNT];
 133 };
 134
 135 static struct binder_stats binder_stats;
 136
 137 struct binder_transaction_log_entry {
 138         int debug_id;
 139         int call_type;
 140         int from_proc;
 141         int from_thread;
 142         int target_handle;
 143         int to_proc;
 144         int to_thread;
 145         int to_node;
 146         int data_size;
 147         int offsets_size;
 148 };
 149 struct binder_transaction_log {
 150         int next;
 151         int full;
 152         struct binder_transaction_log_entry entry[32];
 153 };
 154 struct binder_transaction_log binder_transaction_log;
 155 struct binder_transaction_log binder_transaction_log_failed;
 156
 157 static struct binder_transaction_log_entry *binder_transaction_log_add(
 158         struct binder_transaction_log *log)
 159 {
 160         struct binder_transaction_log_entry *e;
 161         e = &log->entry[log->next];
 162         memset(e, 0, sizeof(*e));
 163         log->next++;
 164         if (log->next == ARRAY_SIZE(log->entry)) {
 165                 log->next = 0;
 166                 log->full = 1;
 167         }
 168         return e;
 169 }
 170
 171 struct binder_work {
 172         struct list_head entry;
 173         enum {
 174                 BINDER_WORK_TRANSACTION = 1,
 175                 BINDER_WORK_TRANSACTION_COMPLETE,
 176                 BINDER_WORK_NODE,
 177                 BINDER_WORK_DEAD_BINDER,
 178                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 179                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 180         } type;
 181 };
 182
 183 struct binder_node {
 184         int debug_id;
 185         struct binder_work work;
 186         union {
 187                 struct rb_node rb_node;
 188                 struct hlist_node dead_node;
 189         };
 190         struct binder_proc *proc;
 191         struct hlist_head refs;
 192         int internal_strong_refs;
 193         int local_weak_refs;
 194         int local_strong_refs;
 195         void __user *ptr;
 196         void __user *cookie;
 197         unsigned has_strong_ref:1;
 198         unsigned pending_strong_ref:1;
 199         unsigned has_weak_ref:1;
 200         unsigned pending_weak_ref:1;
 201         unsigned has_async_transaction:1;
 202         unsigned accept_fds:1;
 203         unsigned min_priority:8;
 204         struct list_head async_todo;
 205 };
 206
 207 struct binder_ref_death {
 208         struct binder_work work;
 209         void __user *cookie;
 210 };
 211
 212 struct binder_ref {
 213         /* Lookups needed: */
 214         /*   node + proc => ref (transaction) */
 215         /*   desc + proc => ref (transaction, inc/dec ref) */
 216         /*   node => refs + procs (proc exit) */
 217         int debug_id;
 218         struct rb_node rb_node_desc;
 219         struct rb_node rb_node_node;
 220         struct hlist_node node_entry;
 221         struct binder_proc *proc;
 222         struct binder_node *node;
 223         uint32_t desc;
 224         int strong;
 225         int weak;
 226         struct binder_ref_death *death;
 227 };
 228
 229 struct binder_buffer {
 230         struct list_head entry; /* free and allocated entries by addesss */
 231         struct rb_node rb_node; /* free entry by size or allocated entry */
 232                                 /* by address */
 233         unsigned free:1;
 234         unsigned allow_user_free:1;
 235         unsigned async_transaction:1;
 236         unsigned debug_id:29;
 237
 238         struct binder_transaction *transaction;
 239
 240         struct binder_node *target_node;
 241         size_t data_size;
 242         size_t offsets_size;
 243         uint8_t data[0];
 244 };
 245
 246 enum {
 247         BINDER_DEFERRED_PUT_FILES    = 0x01,
 248         BINDER_DEFERRED_FLUSH        = 0x02,
 249         BINDER_DEFERRED_RELEASE      = 0x04,
 250 };
 251
 252 struct binder_proc {
 253         struct hlist_node proc_node;
 254         struct rb_root threads;
 255         struct rb_root nodes;
 256         struct rb_root refs_by_desc;
 257         struct rb_root refs_by_node;
 258         int pid;
 259         struct vm_area_struct *vma;
 260         struct task_struct *tsk;
 261         struct files_struct *files;
 262         struct hlist_node deferred_work_node;
 263         int deferred_work;
 264         void *buffer;
 265         ptrdiff_t user_buffer_offset;
 266
 267         struct list_head buffers;
 268         struct rb_root free_buffers;
 269         struct rb_root allocated_buffers;
 270         size_t free_async_space;
 271
 272         struct page **pages;
 273         size_t buffer_size;
 274         uint32_t buffer_free;
 275         struct list_head todo;
 276         wait_queue_head_t wait;
 277         struct binder_stats stats;
 278         struct list_head delivered_death;
 279         int max_threads;
 280         int requested_threads;
 281         int requested_threads_started;
 282         int ready_threads;
 283         long default_priority;
 284 };
 285
 286 enum {
 287         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 288         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 289         BINDER_LOOPER_STATE_EXITED      = 0x04,
 290         BINDER_LOOPER_STATE_INVALID     = 0x08,
 291         BINDER_LOOPER_STATE_WAITING     = 0x10,
 292         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 293 };
 294
 295 struct binder_thread {
 296         struct binder_proc *proc;
 297         struct rb_node rb_node;
 298         int pid;
 299         int looper;
 300         struct binder_transaction *transaction_stack;
 301         struct list_head todo;
 302         uint32_t return_error; /* Write failed, return error code in read buf */
 303         uint32_t return_error2; /* Write failed, return error code in read */
 304                 /* buffer. Used when sending a reply to a dead process that */
 305                 /* we are also waiting on */
 306         wait_queue_head_t wait;
 307         struct binder_stats stats;
 308 };
 309
 310 struct binder_transaction {
 311         int debug_id;
 312         struct binder_work work;
 313         struct binder_thread *from;
 314         struct binder_transaction *from_parent;
 315         struct binder_proc *to_proc;
 316         struct binder_thread *to_thread;
 317         struct binder_transaction *to_parent;
 318         unsigned need_reply:1;
 319         /* unsigned is_dead:1; */       /* not used at the moment */
 320
 321         struct binder_buffer *buffer;
 322         unsigned int    code;
 323         unsigned int    flags;
 324         long    priority;
 325         long    saved_priority;
 326         uid_t   sender_euid;
 327 };
 328
 329 static void binder_defer_work(struct binder_proc *proc, int defer);
 330
 331 /*
 332  * copied from get_unused_fd_flags
 333  */
 334 int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 335 {
 336         struct files_struct *files = proc->files;
 337         int fd, error;
 338         struct fdtable *fdt;
 339         unsigned long rlim_cur;
 340         unsigned long irqs;
 341
 342         if (files == NULL)
 343                 return -ESRCH;
 344
 345         error = -EMFILE;
 346         spin_lock(&files->file_lock);
 347
 348 repeat:
 349         fdt = files_fdtable(files);
 350         fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
 351                                 files->next_fd);
 352
 353         /*
 354          * N.B. For clone tasks sharing a files structure, this test
 355          * will limit the total number of files that can be opened.
 356          */
 357         rlim_cur = 0;
 358         if (lock_task_sighand(proc->tsk, &irqs)) {
 359                 rlim_cur = proc->tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
 360                 unlock_task_sighand(proc->tsk, &irqs);
 361         }
 362         if (fd >= rlim_cur)
 363                 goto out;
 364
 365         /* Do we need to expand the fd array or fd set?  */
 366         error = expand_files(files, fd);
 367         if (error < 0)
 368                 goto out;
 369
 370         if (error) {
 371                 /*
 372                  * If we needed to expand the fs array we
 373                  * might have blocked - try again.
 374                  */
 375                 error = -EMFILE;
 376                 goto repeat;
 377         }
 378
 379         FD_SET(fd, fdt->open_fds);
 380         if (flags & O_CLOEXEC)
 381                 FD_SET(fd, fdt->close_on_exec);
 382         else
 383                 FD_CLR(fd, fdt->close_on_exec);
 384         files->next_fd = fd + 1;
 385 #if 1
 386         /* Sanity check */
 387         if (fdt->fd[fd] != NULL) {
 388                 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
 389                 fdt->fd[fd] = NULL;
 390         }
 391 #endif
 392         error = fd;
 393
 394 out:
 395         spin_unlock(&files->file_lock);
 396         return error;
 397 }
 398
 399 /*
 400  * copied from fd_install
 401  */
 402 static void task_fd_install(
 403         struct binder_proc *proc, unsigned int fd, struct file *file)
 404 {
 405         struct files_struct *files = proc->files;
 406         struct fdtable *fdt;
 407
 408         if (files == NULL)
 409                 return;
 410
 411         spin_lock(&files->file_lock);
 412         fdt = files_fdtable(files);
 413         BUG_ON(fdt->fd[fd] != NULL);
 414         rcu_assign_pointer(fdt->fd[fd], file);
 415         spin_unlock(&files->file_lock);
 416 }
 417
 418 /*
 419  * copied from __put_unused_fd in open.c
 420  */
 421 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 422 {
 423         struct fdtable *fdt = files_fdtable(files);
 424         __FD_CLR(fd, fdt->open_fds);
 425         if (fd < files->next_fd)
 426                 files->next_fd = fd;
 427 }
 428
 429 /*
 430  * copied from sys_close
 431  */
 432 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 433 {
 434         struct file *filp;
 435         struct files_struct *files = proc->files;
 436         struct fdtable *fdt;
 437         int retval;
 438
 439         if (files == NULL)
 440                 return -ESRCH;
 441
 442         spin_lock(&files->file_lock);
 443         fdt = files_fdtable(files);
 444         if (fd >= fdt->max_fds)
 445                 goto out_unlock;
 446         filp = fdt->fd[fd];
 447         if (!filp)
 448                 goto out_unlock;
 449         rcu_assign_pointer(fdt->fd[fd], NULL);
 450         FD_CLR(fd, fdt->close_on_exec);
 451         __put_unused_fd(files, fd);
 452         spin_unlock(&files->file_lock);
 453         retval = filp_close(filp, files);
 454
 455         /* can't restart close syscall because file table entry was cleared */
 456         if (unlikely(retval == -ERESTARTSYS ||
 457                      retval == -ERESTARTNOINTR ||
 458                      retval == -ERESTARTNOHAND ||
 459                      retval == -ERESTART_RESTARTBLOCK))
 460                 retval = -EINTR;
 461
 462         return retval;
 463
 464 out_unlock:
 465         spin_unlock(&files->file_lock);
 466         return -EBADF;
 467 }
 468
 469 static void binder_set_nice(long nice)
 470 {
 471         long min_nice;
 472         if (can_nice(current, nice)) {
 473                 set_user_nice(current, nice);
 474                 return;
 475         }
 476         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 477         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 478                      "binder: %d: nice value %ld not allowed use "
 479                      "%ld instead\n", current->pid, nice, min_nice);
 480         set_user_nice(current, min_nice);
 481         if (min_nice < 20)
 482                 return;
 483         binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
 484 }
 485
 486 static size_t binder_buffer_size(struct binder_proc *proc,
 487                                  struct binder_buffer *buffer)
 488 {
 489         if (list_is_last(&buffer->entry, &proc->buffers))
 490                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 491         else
 492                 return (size_t)list_entry(buffer->entry.next,
 493                         struct binder_buffer, entry) - (size_t)buffer->data;
 494 }
 495
 496 static void binder_insert_free_buffer(struct binder_proc *proc,
 497                                       struct binder_buffer *new_buffer)
 498 {
 499         struct rb_node **p = &proc->free_buffers.rb_node;
 500         struct rb_node *parent = NULL;
 501         struct binder_buffer *buffer;
 502         size_t buffer_size;
 503         size_t new_buffer_size;
 504
 505         BUG_ON(!new_buffer->free);
 506
 507         new_buffer_size = binder_buffer_size(proc, new_buffer);
 508
 509         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 510                      "binder: %d: add free buffer, size %zd, "
 511                      "at %p\n", proc->pid, new_buffer_size, new_buffer);
 512
 513         while (*p) {
 514                 parent = *p;
 515                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 516                 BUG_ON(!buffer->free);
 517
 518                 buffer_size = binder_buffer_size(proc, buffer);
 519
 520                 if (new_buffer_size < buffer_size)
 521                         p = &parent->rb_left;
 522                 else
 523                         p = &parent->rb_right;
 524         }
 525         rb_link_node(&new_buffer->rb_node, parent, p);
 526         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 527 }
 528
 529 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 530                                            struct binder_buffer *new_buffer)
 531 {
 532         struct rb_node **p = &proc->allocated_buffers.rb_node;
 533         struct rb_node *parent = NULL;
 534         struct binder_buffer *buffer;
 535
 536         BUG_ON(new_buffer->free);
 537
 538         while (*p) {
 539                 parent = *p;
 540                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 541                 BUG_ON(buffer->free);
 542
 543                 if (new_buffer < buffer)
 544                         p = &parent->rb_left;
 545                 else if (new_buffer > buffer)
 546                         p = &parent->rb_right;
 547                 else
 548                         BUG();
 549         }
 550         rb_link_node(&new_buffer->rb_node, parent, p);
 551         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 552 }
 553
 554 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 555                                                   void __user *user_ptr)
 556 {
 557         struct rb_node *n = proc->allocated_buffers.rb_node;
 558         struct binder_buffer *buffer;
 559         struct binder_buffer *kern_ptr;
 560
 561         kern_ptr = user_ptr - proc->user_buffer_offset
 562                 - offsetof(struct binder_buffer, data);
 563
 564         while (n) {
 565                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 566                 BUG_ON(buffer->free);
 567
 568                 if (kern_ptr < buffer)
 569                         n = n->rb_left;
 570                 else if (kern_ptr > buffer)
 571                         n = n->rb_right;
 572                 else
 573                         return buffer;
 574         }
 575         return NULL;
 576 }
 577
 578 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 579                                     void *start, void *end,
 580                                     struct vm_area_struct *vma)
 581 {
 582         void *page_addr;
 583         unsigned long user_page_addr;
 584         struct vm_struct tmp_area;
 585         struct page **page;
 586         struct mm_struct *mm;
 587
 588         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 589                      "binder: %d: %s pages %p-%p\n", proc->pid,
 590                      allocate ? "allocate" : "free", start, end);
 591
 592         if (end <= start)
 593                 return 0;
 594
 595         if (vma)
 596                 mm = NULL;
 597         else
 598                 mm = get_task_mm(proc->tsk);
 599
 600         if (mm) {
 601                 down_write(&mm->mmap_sem);
 602                 vma = proc->vma;
 603         }
 604
 605         if (allocate == 0)
 606                 goto free_range;
 607
 608         if (vma == NULL) {
 609                 printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
 610                        "map pages in userspace, no vma\n", proc->pid);
 611                 goto err_no_vma;
 612         }
 613
 614         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 615                 int ret;
 616                 struct page **page_array_ptr;
 617                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 618
 619                 BUG_ON(*page);
 620                 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 621                 if (*page == NULL) {
 622                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 623                                "for page at %p\n", proc->pid, page_addr);
 624                         goto err_alloc_page_failed;
 625                 }
 626                 tmp_area.addr = page_addr;
 627                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 628                 page_array_ptr = page;
 629                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 630                 if (ret) {
 631                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 632                                "to map page at %p in kernel\n",
 633                                proc->pid, page_addr);
 634                         goto err_map_kernel_failed;
 635                 }
 636                 user_page_addr =
 637                         (uintptr_t)page_addr + proc->user_buffer_offset;
 638                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 639                 if (ret) {
 640                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 641                                "to map page at %lx in userspace\n",
 642                                proc->pid, user_page_addr);
 643                         goto err_vm_insert_page_failed;
 644                 }
 645                 /* vm_insert_page does not seem to increment the refcount */
 646         }
 647         if (mm) {
 648                 up_write(&mm->mmap_sem);
 649                 mmput(mm);
 650         }
 651         return 0;
 652
 653 free_range:
 654         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 655              page_addr -= PAGE_SIZE) {
 656                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 657                 if (vma)
 658                         zap_page_range(vma, (uintptr_t)page_addr +
 659                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 660 err_vm_insert_page_failed:
 661                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 662 err_map_kernel_failed:
 663                 __free_page(*page);
 664                 *page = NULL;
 665 err_alloc_page_failed:
 666                 ;
 667         }
 668 err_no_vma:
 669         if (mm) {
 670                 up_write(&mm->mmap_sem);
 671                 mmput(mm);
 672         }
 673         return -ENOMEM;
 674 }
 675
 676 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 677                                               size_t data_size,
 678                                               size_t offsets_size, int is_async)
 679 {
 680         struct rb_node *n = proc->free_buffers.rb_node;
 681         struct binder_buffer *buffer;
 682         size_t buffer_size;
 683         struct rb_node *best_fit = NULL;
 684         void *has_page_addr;
 685         void *end_page_addr;
 686         size_t size;
 687
 688         if (proc->vma == NULL) {
 689                 printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n",
 690                        proc->pid);
 691                 return NULL;
 692         }
 693
 694         size = ALIGN(data_size, sizeof(void *)) +
 695                 ALIGN(offsets_size, sizeof(void *));
 696
 697         if (size < data_size || size < offsets_size) {
 698                 binder_user_error("binder: %d: got transaction with invalid "
 699                         "size %zd-%zd\n", proc->pid, data_size, offsets_size);
 700                 return NULL;
 701         }
 702
 703         if (is_async &&
 704             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 705                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 706                              "binder: %d: binder_alloc_buf size %zd"
 707                              "failed, no async space left\n", proc->pid, size);
 708                 return NULL;
 709         }
 710
 711         while (n) {
 712                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 713                 BUG_ON(!buffer->free);
 714                 buffer_size = binder_buffer_size(proc, buffer);
 715
 716                 if (size < buffer_size) {
 717                         best_fit = n;
 718                         n = n->rb_left;
 719                 } else if (size > buffer_size)
 720                         n = n->rb_right;
 721                 else {
 722                         best_fit = n;
 723                         break;
 724                 }
 725         }
 726         if (best_fit == NULL) {
 727                 printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, "
 728                        "no address space\n", proc->pid, size);
 729                 return NULL;
 730         }
 731         if (n == NULL) {
 732                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 733                 buffer_size = binder_buffer_size(proc, buffer);
 734         }
 735
 736         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 737                      "binder: %d: binder_alloc_buf size %zd got buff"
 738                      "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
 739
 740         has_page_addr =
 741                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 742         if (n == NULL) {
 743                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 744                         buffer_size = size; /* no room for other buffers */
 745                 else
 746                         buffer_size = size + sizeof(struct binder_buffer);
 747         }
 748         end_page_addr =
 749                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 750         if (end_page_addr > has_page_addr)
 751                 end_page_addr = has_page_addr;
 752         if (binder_update_page_range(proc, 1,
 753             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 754                 return NULL;
 755
 756         rb_erase(best_fit, &proc->free_buffers);
 757         buffer->free = 0;
 758         binder_insert_allocated_buffer(proc, buffer);
 759         if (buffer_size != size) {
 760                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 761                 list_add(&new_buffer->entry, &buffer->entry);
 762                 new_buffer->free = 1;
 763                 binder_insert_free_buffer(proc, new_buffer);
 764         }
 765         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 766                      "binder: %d: binder_alloc_buf size %zd got "
 767                      "%p\n", proc->pid, size, buffer);
 768         buffer->data_size = data_size;
 769         buffer->offsets_size = offsets_size;
 770         buffer->async_transaction = is_async;
 771         if (is_async) {
 772                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 773                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 774                              "binder: %d: binder_alloc_buf size %zd "
 775                              "async free %zd\n", proc->pid, size,
 776                              proc->free_async_space);
 777         }
 778
 779         return buffer;
 780 }
 781
 782 static void *buffer_start_page(struct binder_buffer *buffer)
 783 {
 784         return (void *)((uintptr_t)buffer & PAGE_MASK);
 785 }
 786
 787 static void *buffer_end_page(struct binder_buffer *buffer)
 788 {
 789         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 790 }
 791
 792 static void binder_delete_free_buffer(struct binder_proc *proc,
 793                                       struct binder_buffer *buffer)
 794 {
 795         struct binder_buffer *prev, *next = NULL;
 796         int free_page_end = 1;
 797         int free_page_start = 1;
 798
 799         BUG_ON(proc->buffers.next == &buffer->entry);
 800         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 801         BUG_ON(!prev->free);
 802         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 803                 free_page_start = 0;
 804                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 805                         free_page_end = 0;
 806                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 807                              "binder: %d: merge free, buffer %p "
 808                              "share page with %p\n", proc->pid, buffer, prev);
 809         }
 810
 811         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 812                 next = list_entry(buffer->entry.next,
 813                                   struct binder_buffer, entry);
 814                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 815                         free_page_end = 0;
 816                         if (buffer_start_page(next) ==
 817                             buffer_start_page(buffer))
 818                                 free_page_start = 0;
 819                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 820                                      "binder: %d: merge free, buffer"
 821                                      " %p share page with %p\n", proc->pid,
 822                                      buffer, prev);
 823                 }
 824         }
 825         list_del(&buffer->entry);
 826         if (free_page_start || free_page_end) {
 827                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 828                              "binder: %d: merge free, buffer %p do "
 829                              "not share page%s%s with with %p or %p\n",
 830                              proc->pid, buffer, free_page_start ? "" : " end",
 831                              free_page_end ? "" : " start", prev, next);
 832                 binder_update_page_range(proc, 0, free_page_start ?
 833                         buffer_start_page(buffer) : buffer_end_page(buffer),
 834                         (free_page_end ? buffer_end_page(buffer) :
 835                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 836         }
 837 }
 838
 839 static void binder_free_buf(struct binder_proc *proc,
 840                             struct binder_buffer *buffer)
 841 {
 842         size_t size, buffer_size;
 843
 844         buffer_size = binder_buffer_size(proc, buffer);
 845
 846         size = ALIGN(buffer->data_size, sizeof(void *)) +
 847                 ALIGN(buffer->offsets_size, sizeof(void *));
 848
 849         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 850                      "binder: %d: binder_free_buf %p size %zd buffer"
 851                      "_size %zd\n", proc->pid, buffer, size, buffer_size);
 852
 853         BUG_ON(buffer->free);
 854         BUG_ON(size > buffer_size);
 855         BUG_ON(buffer->transaction != NULL);
 856         BUG_ON((void *)buffer < proc->buffer);
 857         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 858
 859         if (buffer->async_transaction) {
 860                 proc->free_async_space += size + sizeof(struct binder_buffer);
 861
 862                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 863                              "binder: %d: binder_free_buf size %zd "
 864                              "async free %zd\n", proc->pid, size,
 865                              proc->free_async_space);
 866         }
 867
 868         binder_update_page_range(proc, 0,
 869                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 870                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 871                 NULL);
 872         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 873         buffer->free = 1;
 874         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 875                 struct binder_buffer *next = list_entry(buffer->entry.next,
 876                                                 struct binder_buffer, entry);
 877                 if (next->free) {
 878                         rb_erase(&next->rb_node, &proc->free_buffers);
 879                         binder_delete_free_buffer(proc, next);
 880                 }
 881         }
 882         if (proc->buffers.next != &buffer->entry) {
 883                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 884                                                 struct binder_buffer, entry);
 885                 if (prev->free) {
 886                         binder_delete_free_buffer(proc, buffer);
 887                         rb_erase(&prev->rb_node, &proc->free_buffers);
 888                         buffer = prev;
 889                 }
 890         }
 891         binder_insert_free_buffer(proc, buffer);
 892 }
 893
 894 static struct binder_node *binder_get_node(struct binder_proc *proc,
 895                                            void __user *ptr)
 896 {
 897         struct rb_node *n = proc->nodes.rb_node;
 898         struct binder_node *node;
 899
 900         while (n) {
 901                 node = rb_entry(n, struct binder_node, rb_node);
 902
 903                 if (ptr < node->ptr)
 904                         n = n->rb_left;
 905                 else if (ptr > node->ptr)
 906                         n = n->rb_right;
 907                 else
 908                         return node;
 909         }
 910         return NULL;
 911 }
 912
 913 static struct binder_node *binder_new_node(struct binder_proc *proc,
 914                                            void __user *ptr,
 915                                            void __user *cookie)
 916 {
 917         struct rb_node **p = &proc->nodes.rb_node;
 918         struct rb_node *parent = NULL;
 919         struct binder_node *node;
 920
 921         while (*p) {
 922                 parent = *p;
 923                 node = rb_entry(parent, struct binder_node, rb_node);
 924
 925                 if (ptr < node->ptr)
 926                         p = &(*p)->rb_left;
 927                 else if (ptr > node->ptr)
 928                         p = &(*p)->rb_right;
 929                 else
 930                         return NULL;
 931         }
 932
 933         node = kzalloc(sizeof(*node), GFP_KERNEL);
 934         if (node == NULL)
 935                 return NULL;
 936         binder_stats.obj_created[BINDER_STAT_NODE]++;
 937         rb_link_node(&node->rb_node, parent, p);
 938         rb_insert_color(&node->rb_node, &proc->nodes);
 939         node->debug_id = ++binder_last_id;
 940         node->proc = proc;
 941         node->ptr = ptr;
 942         node->cookie = cookie;
 943         node->work.type = BINDER_WORK_NODE;
 944         INIT_LIST_HEAD(&node->work.entry);
 945         INIT_LIST_HEAD(&node->async_todo);
 946         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 947                      "binder: %d:%d node %d u%p c%p created\n",
 948                      proc->pid, current->pid, node->debug_id,
 949                      node->ptr, node->cookie);
 950         return node;
 951 }
 952
 953 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 954                            struct list_head *target_list)
 955 {
 956         if (strong) {
 957                 if (internal) {
 958                         if (target_list == NULL &&
 959                             node->internal_strong_refs == 0 &&
 960                             !(node == binder_context_mgr_node &&
 961                             node->has_strong_ref)) {
 962                                 printk(KERN_ERR "binder: invalid inc strong "
 963                                         "node for %d\n", node->debug_id);
 964                                 return -EINVAL;
 965                         }
 966                         node->internal_strong_refs++;
 967                 } else
 968                         node->local_strong_refs++;
 969                 if (!node->has_strong_ref && target_list) {
 970                         list_del_init(&node->work.entry);
 971                         list_add_tail(&node->work.entry, target_list);
 972                 }
 973         } else {
 974                 if (!internal)
 975                         node->local_weak_refs++;
 976                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 977                         if (target_list == NULL) {
 978                                 printk(KERN_ERR "binder: invalid inc weak node "
 979                                         "for %d\n", node->debug_id);
 980                                 return -EINVAL;
 981                         }
 982                         list_add_tail(&node->work.entry, target_list);
 983                 }
 984         }
 985         return 0;
 986 }
 987
 988 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 989 {
 990         if (strong) {
 991                 if (internal)
 992                         node->internal_strong_refs--;
 993                 else
 994                         node->local_strong_refs--;
 995                 if (node->local_strong_refs || node->internal_strong_refs)
 996                         return 0;
 997         } else {
 998                 if (!internal)
 999                         node->local_weak_refs--;
1000                 if (node->local_weak_refs || !hlist_empty(&node->refs))
1001                         return 0;
1002         }
1003         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
1004                 if (list_empty(&node->work.entry)) {
1005                         list_add_tail(&node->work.entry, &node->proc->todo);
1006                         wake_up_interruptible(&node->proc->wait);
1007                 }
1008         } else {
1009                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1010                     !node->local_weak_refs) {
1011                         list_del_init(&node->work.entry);
1012                         if (node->proc) {
1013                                 rb_erase(&node->rb_node, &node->proc->nodes);
1014                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1015                                              "binder: refless node %d deleted\n",
1016                                              node->debug_id);
1017                         } else {
1018                                 hlist_del(&node->dead_node);
1019                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1020                                              "binder: dead node %d deleted\n",
1021                                              node->debug_id);
1022                         }
1023                         kfree(node);
1024                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
1025                 }
1026         }
1027
1028         return 0;
1029 }
1030
1031
1032 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1033                                          uint32_t desc)
1034 {
1035         struct rb_node *n = proc->refs_by_desc.rb_node;
1036         struct binder_ref *ref;
1037
1038         while (n) {
1039                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1040
1041                 if (desc < ref->desc)
1042                         n = n->rb_left;
1043                 else if (desc > ref->desc)
1044                         n = n->rb_right;
1045                 else
1046                         return ref;
1047         }
1048         return NULL;
1049 }
1050
1051 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1052                                                   struct binder_node *node)
1053 {
1054         struct rb_node *n;
1055         struct rb_node **p = &proc->refs_by_node.rb_node;
1056         struct rb_node *parent = NULL;
1057         struct binder_ref *ref, *new_ref;
1058
1059         while (*p) {
1060                 parent = *p;
1061                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1062
1063                 if (node < ref->node)
1064                         p = &(*p)->rb_left;
1065                 else if (node > ref->node)
1066                         p = &(*p)->rb_right;
1067                 else
1068                         return ref;
1069         }
1070         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1071         if (new_ref == NULL)
1072                 return NULL;
1073         binder_stats.obj_created[BINDER_STAT_REF]++;
1074         new_ref->debug_id = ++binder_last_id;
1075         new_ref->proc = proc;
1076         new_ref->node = node;
1077         rb_link_node(&new_ref->rb_node_node, parent, p);
1078         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1079
1080         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1081         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1082                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1083                 if (ref->desc > new_ref->desc)
1084                         break;
1085                 new_ref->desc = ref->desc + 1;
1086         }
1087
1088         p = &proc->refs_by_desc.rb_node;
1089         while (*p) {
1090                 parent = *p;
1091                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1092
1093                 if (new_ref->desc < ref->desc)
1094                         p = &(*p)->rb_left;
1095                 else if (new_ref->desc > ref->desc)
1096                         p = &(*p)->rb_right;
1097                 else
1098                         BUG();
1099         }
1100         rb_link_node(&new_ref->rb_node_desc, parent, p);
1101         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1102         if (node) {
1103                 hlist_add_head(&new_ref->node_entry, &node->refs);
1104
1105                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1106                              "binder: %d new ref %d desc %d for "
1107                              "node %d\n", proc->pid, new_ref->debug_id,
1108                              new_ref->desc, node->debug_id);
1109         } else {
1110                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1111                              "binder: %d new ref %d desc %d for "
1112                              "dead node\n", proc->pid, new_ref->debug_id,
1113                               new_ref->desc);
1114         }
1115         return new_ref;
1116 }
1117
1118 static void binder_delete_ref(struct binder_ref *ref)
1119 {
1120         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1121                      "binder: %d delete ref %d desc %d for "
1122                      "node %d\n", ref->proc->pid, ref->debug_id,
1123                      ref->desc, ref->node->debug_id);
1124
1125         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1126         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1127         if (ref->strong)
1128                 binder_dec_node(ref->node, 1, 1);
1129         hlist_del(&ref->node_entry);
1130         binder_dec_node(ref->node, 0, 1);
1131         if (ref->death) {
1132                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1133                              "binder: %d delete ref %d desc %d "
1134                              "has death notification\n", ref->proc->pid,
1135                              ref->debug_id, ref->desc);
1136                 list_del(&ref->death->work.entry);
1137                 kfree(ref->death);
1138                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
1139         }
1140         kfree(ref);
1141         binder_stats.obj_deleted[BINDER_STAT_REF]++;
1142 }
1143
1144 static int binder_inc_ref(struct binder_ref *ref, int strong,
1145                           struct list_head *target_list)
1146 {
1147         int ret;
1148         if (strong) {
1149                 if (ref->strong == 0) {
1150                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1151                         if (ret)
1152                                 return ret;
1153                 }
1154                 ref->strong++;
1155         } else {
1156                 if (ref->weak == 0) {
1157                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1158                         if (ret)
1159                                 return ret;
1160                 }
1161                 ref->weak++;
1162         }
1163         return 0;
1164 }
1165
1166
1167 static int binder_dec_ref(struct binder_ref *ref, int strong)
1168 {
1169         if (strong) {
1170                 if (ref->strong == 0) {
1171                         binder_user_error("binder: %d invalid dec strong, "
1172                                           "ref %d desc %d s %d w %d\n",
1173                                           ref->proc->pid, ref->debug_id,
1174                                           ref->desc, ref->strong, ref->weak);
1175                         return -EINVAL;
1176                 }
1177                 ref->strong--;
1178                 if (ref->strong == 0) {
1179                         int ret;
1180                         ret = binder_dec_node(ref->node, strong, 1);
1181                         if (ret)
1182                                 return ret;
1183                 }
1184         } else {
1185                 if (ref->weak == 0) {
1186                         binder_user_error("binder: %d invalid dec weak, "
1187                                           "ref %d desc %d s %d w %d\n",
1188                                           ref->proc->pid, ref->debug_id,
1189                                           ref->desc, ref->strong, ref->weak);
1190                         return -EINVAL;
1191                 }
1192                 ref->weak--;
1193         }
1194         if (ref->strong == 0 && ref->weak == 0)
1195                 binder_delete_ref(ref);
1196         return 0;
1197 }
1198
1199 static void binder_pop_transaction(struct binder_thread *target_thread,
1200                                    struct binder_transaction *t)
1201 {
1202         if (target_thread) {
1203                 BUG_ON(target_thread->transaction_stack != t);
1204                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1205                 target_thread->transaction_stack =
1206                         target_thread->transaction_stack->from_parent;
1207                 t->from = NULL;
1208         }
1209         t->need_reply = 0;
1210         if (t->buffer)
1211                 t->buffer->transaction = NULL;
1212         kfree(t);
1213         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1214 }
1215
1216 static void binder_send_failed_reply(struct binder_transaction *t,
1217                                      uint32_t error_code)
1218 {
1219         struct binder_thread *target_thread;
1220         BUG_ON(t->flags & TF_ONE_WAY);
1221         while (1) {
1222                 target_thread = t->from;
1223                 if (target_thread) {
1224                         if (target_thread->return_error != BR_OK &&
1225                            target_thread->return_error2 == BR_OK) {
1226                                 target_thread->return_error2 =
1227                                         target_thread->return_error;
1228                                 target_thread->return_error = BR_OK;
1229                         }
1230                         if (target_thread->return_error == BR_OK) {
1231                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1232                                              "binder: send failed reply for "
1233                                              "transaction %d to %d:%d\n",
1234                                               t->debug_id, target_thread->proc->pid,
1235                                               target_thread->pid);
1236
1237                                 binder_pop_transaction(target_thread, t);
1238                                 target_thread->return_error = error_code;
1239                                 wake_up_interruptible(&target_thread->wait);
1240                         } else {
1241                                 printk(KERN_ERR "binder: reply failed, target "
1242                                         "thread, %d:%d, has error code %d "
1243                                         "already\n", target_thread->proc->pid,
1244                                         target_thread->pid,
1245                                         target_thread->return_error);
1246                         }
1247                         return;
1248                 } else {
1249                         struct binder_transaction *next = t->from_parent;
1250
1251                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1252                                      "binder: send failed reply "
1253                                      "for transaction %d, target dead\n",
1254                                      t->debug_id);
1255
1256                         binder_pop_transaction(target_thread, t);
1257                         if (next == NULL) {
1258                                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1259                                              "binder: reply failed,"
1260                                              " no target thread at root\n");
1261                                 return;
1262                         }
1263                         t = next;
1264                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1265                                      "binder: reply failed, no target "
1266                                      "thread -- retry %d\n", t->debug_id);
1267                 }
1268         }
1269 }
1270
1271 static void binder_transaction_buffer_release(struct binder_proc *proc,
1272                                               struct binder_buffer *buffer,
1273                                               size_t *failed_at)
1274 {
1275         size_t *offp, *off_end;
1276         int debug_id = buffer->debug_id;
1277
1278         binder_debug(BINDER_DEBUG_TRANSACTION,
1279                      "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1280                      proc->pid, buffer->debug_id,
1281                      buffer->data_size, buffer->offsets_size, failed_at);
1282
1283         if (buffer->target_node)
1284                 binder_dec_node(buffer->target_node, 1, 0);
1285
1286         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1287         if (failed_at)
1288                 off_end = failed_at;
1289         else
1290                 off_end = (void *)offp + buffer->offsets_size;
1291         for (; offp < off_end; offp++) {
1292                 struct flat_binder_object *fp;
1293                 if (*offp > buffer->data_size - sizeof(*fp) ||
1294                     buffer->data_size < sizeof(*fp) ||
1295                     !IS_ALIGNED(*offp, sizeof(void *))) {
1296                         printk(KERN_ERR "binder: transaction release %d bad"
1297                                         "offset %zd, size %zd\n", debug_id, *offp, buffer->data_size);
1298                         continue;
1299                 }
1300                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1301                 switch (fp->type) {
1302                 case BINDER_TYPE_BINDER:
1303                 case BINDER_TYPE_WEAK_BINDER: {
1304                         struct binder_node *node = binder_get_node(proc, fp->binder);
1305                         if (node == NULL) {
1306                                 printk(KERN_ERR "binder: transaction release %d bad node %p\n", debug_id, fp->binder);
1307                                 break;
1308                         }
1309                         binder_debug(BINDER_DEBUG_TRANSACTION,
1310                                      "        node %d u%p\n",
1311                                      node->debug_id, node->ptr);
1312                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1313                 } break;
1314                 case BINDER_TYPE_HANDLE:
1315                 case BINDER_TYPE_WEAK_HANDLE: {
1316                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1317                         if (ref == NULL) {
1318                                 printk(KERN_ERR "binder: transaction release %d bad handle %ld\n", debug_id, fp->handle);
1319                                 break;
1320                         }
1321                         binder_debug(BINDER_DEBUG_TRANSACTION,
1322                                      "        ref %d desc %d (node %d)\n",
1323                                      ref->debug_id, ref->desc, ref->node->debug_id);
1324                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1325                 } break;
1326
1327                 case BINDER_TYPE_FD:
1328                         binder_debug(BINDER_DEBUG_TRANSACTION,
1329                                      "        fd %ld\n", fp->handle);
1330                         if (failed_at)
1331                                 task_close_fd(proc, fp->handle);
1332                         break;
1333
1334                 default:
1335                         printk(KERN_ERR "binder: transaction release %d bad object type %lx\n", debug_id, fp->type);
1336                         break;
1337                 }
1338         }
1339 }
1340
1341 static void binder_transaction(struct binder_proc *proc,
1342                                struct binder_thread *thread,
1343                                struct binder_transaction_data *tr, int reply)
1344 {
1345         struct binder_transaction *t;
1346         struct binder_work *tcomplete;
1347         size_t *offp, *off_end;
1348         struct binder_proc *target_proc;
1349         struct binder_thread *target_thread = NULL;
1350         struct binder_node *target_node = NULL;
1351         struct list_head *target_list;
1352         wait_queue_head_t *target_wait;
1353         struct binder_transaction *in_reply_to = NULL;
1354         struct binder_transaction_log_entry *e;
1355         uint32_t return_error;
1356
1357         e = binder_transaction_log_add(&binder_transaction_log);
1358         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1359         e->from_proc = proc->pid;
1360         e->from_thread = thread->pid;
1361         e->target_handle = tr->target.handle;
1362         e->data_size = tr->data_size;
1363         e->offsets_size = tr->offsets_size;
1364
1365         if (reply) {
1366                 in_reply_to = thread->transaction_stack;
1367                 if (in_reply_to == NULL) {
1368                         binder_user_error("binder: %d:%d got reply transaction "
1369                                           "with no transaction stack\n",
1370                                           proc->pid, thread->pid);
1371                         return_error = BR_FAILED_REPLY;
1372                         goto err_empty_call_stack;
1373                 }
1374                 binder_set_nice(in_reply_to->saved_priority);
1375                 if (in_reply_to->to_thread != thread) {
1376                         binder_user_error("binder: %d:%d got reply transaction "
1377                                 "with bad transaction stack,"
1378                                 " transaction %d has target %d:%d\n",
1379                                 proc->pid, thread->pid, in_reply_to->debug_id,
1380                                 in_reply_to->to_proc ?
1381                                 in_reply_to->to_proc->pid : 0,
1382                                 in_reply_to->to_thread ?
1383                                 in_reply_to->to_thread->pid : 0);
1384                         return_error = BR_FAILED_REPLY;
1385                         in_reply_to = NULL;
1386                         goto err_bad_call_stack;
1387                 }
1388                 thread->transaction_stack = in_reply_to->to_parent;
1389                 target_thread = in_reply_to->from;
1390                 if (target_thread == NULL) {
1391                         return_error = BR_DEAD_REPLY;
1392                         goto err_dead_binder;
1393                 }
1394                 if (target_thread->transaction_stack != in_reply_to) {
1395                         binder_user_error("binder: %d:%d got reply transaction "
1396                                 "with bad target transaction stack %d, "
1397                                 "expected %d\n",
1398                                 proc->pid, thread->pid,
1399                                 target_thread->transaction_stack ?
1400                                 target_thread->transaction_stack->debug_id : 0,
1401                                 in_reply_to->debug_id);
1402                         return_error = BR_FAILED_REPLY;
1403                         in_reply_to = NULL;
1404                         target_thread = NULL;
1405                         goto err_dead_binder;
1406                 }
1407                 target_proc = target_thread->proc;
1408         } else {
1409                 if (tr->target.handle) {
1410                         struct binder_ref *ref;
1411                         ref = binder_get_ref(proc, tr->target.handle);
1412                         if (ref == NULL) {
1413                                 binder_user_error("binder: %d:%d got "
1414                                         "transaction to invalid handle\n",
1415                                         proc->pid, thread->pid);
1416                                 return_error = BR_FAILED_REPLY;
1417                                 goto err_invalid_target_handle;
1418                         }
1419                         target_node = ref->node;
1420                 } else {
1421                         target_node = binder_context_mgr_node;
1422                         if (target_node == NULL) {
1423                                 return_error = BR_DEAD_REPLY;
1424                                 goto err_no_context_mgr_node;
1425                         }
1426                 }
1427                 e->to_node = target_node->debug_id;
1428                 target_proc = target_node->proc;
1429                 if (target_proc == NULL) {
1430                         return_error = BR_DEAD_REPLY;
1431                         goto err_dead_binder;
1432                 }
1433                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1434                         struct binder_transaction *tmp;
1435                         tmp = thread->transaction_stack;
1436                         if (tmp->to_thread != thread) {
1437                                 binder_user_error("binder: %d:%d got new "
1438                                         "transaction with bad transaction stack"
1439                                         ", transaction %d has target %d:%d\n",
1440                                         proc->pid, thread->pid, tmp->debug_id,
1441                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1442                                         tmp->to_thread ?
1443                                         tmp->to_thread->pid : 0);
1444                                 return_error = BR_FAILED_REPLY;
1445                                 goto err_bad_call_stack;
1446                         }
1447                         while (tmp) {
1448                                 if (tmp->from && tmp->from->proc == target_proc)
1449                                         target_thread = tmp->from;
1450                                 tmp = tmp->from_parent;
1451                         }
1452                 }
1453         }
1454         if (target_thread) {
1455                 e->to_thread = target_thread->pid;
1456                 target_list = &target_thread->todo;
1457                 target_wait = &target_thread->wait;
1458         } else {
1459                 target_list = &target_proc->todo;
1460                 target_wait = &target_proc->wait;
1461         }
1462         e->to_proc = target_proc->pid;
1463
1464         /* TODO: reuse incoming transaction for reply */
1465         t = kzalloc(sizeof(*t), GFP_KERNEL);
1466         if (t == NULL) {
1467                 return_error = BR_FAILED_REPLY;
1468                 goto err_alloc_t_failed;
1469         }
1470         binder_stats.obj_created[BINDER_STAT_TRANSACTION]++;
1471
1472         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1473         if (tcomplete == NULL) {
1474                 return_error = BR_FAILED_REPLY;
1475                 goto err_alloc_tcomplete_failed;
1476         }
1477         binder_stats.obj_created[BINDER_STAT_TRANSACTION_COMPLETE]++;
1478
1479         t->debug_id = ++binder_last_id;
1480         e->debug_id = t->debug_id;
1481
1482         if (reply)
1483                 binder_debug(BINDER_DEBUG_TRANSACTION,
1484                              "binder: %d:%d BC_REPLY %d -> %d:%d, "
1485                              "data %p-%p size %zd-%zd\n",
1486                              proc->pid, thread->pid, t->debug_id,
1487                              target_proc->pid, target_thread->pid,
1488                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1489                              tr->data_size, tr->offsets_size);
1490         else
1491                 binder_debug(BINDER_DEBUG_TRANSACTION,
1492                              "binder: %d:%d BC_TRANSACTION %d -> "
1493                              "%d - node %d, data %p-%p size %zd-%zd\n",
1494                              proc->pid, thread->pid, t->debug_id,
1495                              target_proc->pid, target_node->debug_id,
1496                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1497                              tr->data_size, tr->offsets_size);
1498
1499         if (!reply && !(tr->flags & TF_ONE_WAY))
1500                 t->from = thread;
1501         else
1502                 t->from = NULL;
1503         t->sender_euid = proc->tsk->cred->euid;
1504         t->to_proc = target_proc;
1505         t->to_thread = target_thread;
1506         t->code = tr->code;
1507         t->flags = tr->flags;
1508         t->priority = task_nice(current);
1509         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1510                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1511         if (t->buffer == NULL) {
1512                 return_error = BR_FAILED_REPLY;
1513                 goto err_binder_alloc_buf_failed;
1514         }
1515         t->buffer->allow_user_free = 0;
1516         t->buffer->debug_id = t->debug_id;
1517         t->buffer->transaction = t;
1518         t->buffer->target_node = target_node;
1519         if (target_node)
1520                 binder_inc_node(target_node, 1, 0, NULL);
1521
1522         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1523
1524         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1525                 binder_user_error("binder: %d:%d got transaction with invalid "
1526                         "data ptr\n", proc->pid, thread->pid);
1527                 return_error = BR_FAILED_REPLY;
1528                 goto err_copy_data_failed;
1529         }
1530         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1531                 binder_user_error("binder: %d:%d got transaction with invalid "
1532                         "offsets ptr\n", proc->pid, thread->pid);
1533                 return_error = BR_FAILED_REPLY;
1534                 goto err_copy_data_failed;
1535         }
1536         if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1537                 binder_user_error("binder: %d:%d got transaction with "
1538                         "invalid offsets size, %zd\n",
1539                         proc->pid, thread->pid, tr->offsets_size);
1540                 return_error = BR_FAILED_REPLY;
1541                 goto err_bad_offset;
1542         }
1543         off_end = (void *)offp + tr->offsets_size;
1544         for (; offp < off_end; offp++) {
1545                 struct flat_binder_object *fp;
1546                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1547                     t->buffer->data_size < sizeof(*fp) ||
1548                     !IS_ALIGNED(*offp, sizeof(void *))) {
1549                         binder_user_error("binder: %d:%d got transaction with "
1550                                 "invalid offset, %zd\n",
1551                                 proc->pid, thread->pid, *offp);
1552                         return_error = BR_FAILED_REPLY;
1553                         goto err_bad_offset;
1554                 }
1555                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1556                 switch (fp->type) {
1557                 case BINDER_TYPE_BINDER:
1558                 case BINDER_TYPE_WEAK_BINDER: {
1559                         struct binder_ref *ref;
1560                         struct binder_node *node = binder_get_node(proc, fp->binder);
1561                         if (node == NULL) {
1562                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1563                                 if (node == NULL) {
1564                                         return_error = BR_FAILED_REPLY;
1565                                         goto err_binder_new_node_failed;
1566                                 }
1567                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1568                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1569                         }
1570                         if (fp->cookie != node->cookie) {
1571                                 binder_user_error("binder: %d:%d sending u%p "
1572                                         "node %d, cookie mismatch %p != %p\n",
1573                                         proc->pid, thread->pid,
1574                                         fp->binder, node->debug_id,
1575                                         fp->cookie, node->cookie);
1576                                 goto err_binder_get_ref_for_node_failed;
1577                         }
1578                         ref = binder_get_ref_for_node(target_proc, node);
1579                         if (ref == NULL) {
1580                                 return_error = BR_FAILED_REPLY;
1581                                 goto err_binder_get_ref_for_node_failed;
1582                         }
1583                         if (fp->type == BINDER_TYPE_BINDER)
1584                                 fp->type = BINDER_TYPE_HANDLE;
1585                         else
1586                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1587                         fp->handle = ref->desc;
1588                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE, &thread->todo);
1589
1590                         binder_debug(BINDER_DEBUG_TRANSACTION,
1591                                      "        node %d u%p -> ref %d desc %d\n",
1592                                      node->debug_id, node->ptr, ref->debug_id,
1593                                      ref->desc);
1594                 } break;
1595                 case BINDER_TYPE_HANDLE:
1596                 case BINDER_TYPE_WEAK_HANDLE: {
1597                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1598                         if (ref == NULL) {
1599                                 binder_user_error("binder: %d:%d got "
1600                                         "transaction with invalid "
1601                                         "handle, %ld\n", proc->pid,
1602                                         thread->pid, fp->handle);
1603                                 return_error = BR_FAILED_REPLY;
1604                                 goto err_binder_get_ref_failed;
1605                         }
1606                         if (ref->node->proc == target_proc) {
1607                                 if (fp->type == BINDER_TYPE_HANDLE)
1608                                         fp->type = BINDER_TYPE_BINDER;
1609                                 else
1610                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1611                                 fp->binder = ref->node->ptr;
1612                                 fp->cookie = ref->node->cookie;
1613                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1614                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1615                                              "        ref %d desc %d -> node %d u%p\n",
1616                                              ref->debug_id, ref->desc, ref->node->debug_id,
1617                                              ref->node->ptr);
1618                         } else {
1619                                 struct binder_ref *new_ref;
1620                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1621                                 if (new_ref == NULL) {
1622                                         return_error = BR_FAILED_REPLY;
1623                                         goto err_binder_get_ref_for_node_failed;
1624                                 }
1625                                 fp->handle = new_ref->desc;
1626                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1627                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1628                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1629                                              ref->debug_id, ref->desc, new_ref->debug_id,
1630                                              new_ref->desc, ref->node->debug_id);
1631                         }
1632                 } break;
1633
1634                 case BINDER_TYPE_FD: {
1635                         int target_fd;
1636                         struct file *file;
1637
1638                         if (reply) {
1639                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1640                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1641                                                 proc->pid, thread->pid, fp->handle);
1642                                         return_error = BR_FAILED_REPLY;
1643                                         goto err_fd_not_allowed;
1644                                 }
1645                         } else if (!target_node->accept_fds) {
1646                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1647                                         proc->pid, thread->pid, fp->handle);
1648                                 return_error = BR_FAILED_REPLY;
1649                                 goto err_fd_not_allowed;
1650                         }
1651
1652                         file = fget(fp->handle);
1653                         if (file == NULL) {
1654                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1655                                         proc->pid, thread->pid, fp->handle);
1656                                 return_error = BR_FAILED_REPLY;
1657                                 goto err_fget_failed;
1658                         }
1659                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1660                         if (target_fd < 0) {
1661                                 fput(file);
1662                                 return_error = BR_FAILED_REPLY;
1663                                 goto err_get_unused_fd_failed;
1664                         }
1665                         task_fd_install(target_proc, target_fd, file);
1666                         binder_debug(BINDER_DEBUG_TRANSACTION,
1667                                      "        fd %ld -> %d\n", fp->handle, target_fd);
1668                         /* TODO: fput? */
1669                         fp->handle = target_fd;
1670                 } break;
1671
1672                 default:
1673                         binder_user_error("binder: %d:%d got transactio"
1674                                 "n with invalid object type, %lx\n",
1675                                 proc->pid, thread->pid, fp->type);
1676                         return_error = BR_FAILED_REPLY;
1677                         goto err_bad_object_type;
1678                 }
1679         }
1680         if (reply) {
1681                 BUG_ON(t->buffer->async_transaction != 0);
1682                 binder_pop_transaction(target_thread, in_reply_to);
1683         } else if (!(t->flags & TF_ONE_WAY)) {
1684                 BUG_ON(t->buffer->async_transaction != 0);
1685                 t->need_reply = 1;
1686                 t->from_parent = thread->transaction_stack;
1687                 thread->transaction_stack = t;
1688         } else {
1689                 BUG_ON(target_node == NULL);
1690                 BUG_ON(t->buffer->async_transaction != 1);
1691                 if (target_node->has_async_transaction) {
1692                         target_list = &target_node->async_todo;
1693                         target_wait = NULL;
1694                 } else
1695                         target_node->has_async_transaction = 1;
1696         }
1697         t->work.type = BINDER_WORK_TRANSACTION;
1698         list_add_tail(&t->work.entry, target_list);
1699         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1700         list_add_tail(&tcomplete->entry, &thread->todo);
1701         if (target_wait)
1702                 wake_up_interruptible(target_wait);
1703         return;
1704
1705 err_get_unused_fd_failed:
1706 err_fget_failed:
1707 err_fd_not_allowed:
1708 err_binder_get_ref_for_node_failed:
1709 err_binder_get_ref_failed:
1710 err_binder_new_node_failed:
1711 err_bad_object_type:
1712 err_bad_offset:
1713 err_copy_data_failed:
1714         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1715         t->buffer->transaction = NULL;
1716         binder_free_buf(target_proc, t->buffer);
1717 err_binder_alloc_buf_failed:
1718         kfree(tcomplete);
1719         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
1720 err_alloc_tcomplete_failed:
1721         kfree(t);
1722         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1723 err_alloc_t_failed:
1724 err_bad_call_stack:
1725 err_empty_call_stack:
1726 err_dead_binder:
1727 err_invalid_target_handle:
1728 err_no_context_mgr_node:
1729         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1730                      "binder: %d:%d transaction failed %d, size %zd-%zd\n",
1731                      proc->pid, thread->pid, return_error,
1732                      tr->data_size, tr->offsets_size);
1733
1734         {
1735                 struct binder_transaction_log_entry *fe;
1736                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1737                 *fe = *e;
1738         }
1739
1740         BUG_ON(thread->return_error != BR_OK);
1741         if (in_reply_to) {
1742                 thread->return_error = BR_TRANSACTION_COMPLETE;
1743                 binder_send_failed_reply(in_reply_to, return_error);
1744         } else
1745                 thread->return_error = return_error;
1746 }
1747
1748 int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1749                         void __user *buffer, int size, signed long *consumed)
1750 {
1751         uint32_t cmd;
1752         void __user *ptr = buffer + *consumed;
1753         void __user *end = buffer + size;
1754
1755         while (ptr < end && thread->return_error == BR_OK) {
1756                 if (get_user(cmd, (uint32_t __user *)ptr))
1757                         return -EFAULT;
1758                 ptr += sizeof(uint32_t);
1759                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1760                         binder_stats.bc[_IOC_NR(cmd)]++;
1761                         proc->stats.bc[_IOC_NR(cmd)]++;
1762                         thread->stats.bc[_IOC_NR(cmd)]++;
1763                 }
1764                 switch (cmd) {
1765                 case BC_INCREFS:
1766                 case BC_ACQUIRE:
1767                 case BC_RELEASE:
1768                 case BC_DECREFS: {
1769                         uint32_t target;
1770                         struct binder_ref *ref;
1771                         const char *debug_string;
1772
1773                         if (get_user(target, (uint32_t __user *)ptr))
1774                                 return -EFAULT;
1775                         ptr += sizeof(uint32_t);
1776                         if (target == 0 && binder_context_mgr_node &&
1777                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1778                                 ref = binder_get_ref_for_node(proc,
1779                                                binder_context_mgr_node);
1780                                 if (ref->desc != target) {
1781                                         binder_user_error("binder: %d:"
1782                                                 "%d tried to acquire "
1783                                                 "reference to desc 0, "
1784                                                 "got %d instead\n",
1785                                                 proc->pid, thread->pid,
1786                                                 ref->desc);
1787                                 }
1788                         } else
1789                                 ref = binder_get_ref(proc, target);
1790                         if (ref == NULL) {
1791                                 binder_user_error("binder: %d:%d refcou"
1792                                         "nt change on invalid ref %d\n",
1793                                         proc->pid, thread->pid, target);
1794                                 break;
1795                         }
1796                         switch (cmd) {
1797                         case BC_INCREFS:
1798                                 debug_string = "IncRefs";
1799                                 binder_inc_ref(ref, 0, NULL);
1800                                 break;
1801                         case BC_ACQUIRE:
1802                                 debug_string = "Acquire";
1803                                 binder_inc_ref(ref, 1, NULL);
1804                                 break;
1805                         case BC_RELEASE:
1806                                 debug_string = "Release";
1807                                 binder_dec_ref(ref, 1);
1808                                 break;
1809                         case BC_DECREFS:
1810                         default:
1811                                 debug_string = "DecRefs";
1812                                 binder_dec_ref(ref, 0);
1813                                 break;
1814                         }
1815                         binder_debug(BINDER_DEBUG_USER_REFS,
1816                                      "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1817                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1818                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1819                         break;
1820                 }
1821                 case BC_INCREFS_DONE:
1822                 case BC_ACQUIRE_DONE: {
1823                         void __user *node_ptr;
1824                         void *cookie;
1825                         struct binder_node *node;
1826
1827                         if (get_user(node_ptr, (void * __user *)ptr))
1828                                 return -EFAULT;
1829                         ptr += sizeof(void *);
1830                         if (get_user(cookie, (void * __user *)ptr))
1831                                 return -EFAULT;
1832                         ptr += sizeof(void *);
1833                         node = binder_get_node(proc, node_ptr);
1834                         if (node == NULL) {
1835                                 binder_user_error("binder: %d:%d "
1836                                         "%s u%p no match\n",
1837                                         proc->pid, thread->pid,
1838                                         cmd == BC_INCREFS_DONE ?
1839                                         "BC_INCREFS_DONE" :
1840                                         "BC_ACQUIRE_DONE",
1841                                         node_ptr);
1842                                 break;
1843                         }
1844                         if (cookie != node->cookie) {
1845                                 binder_user_error("binder: %d:%d %s u%p node %d"
1846                                         " cookie mismatch %p != %p\n",
1847                                         proc->pid, thread->pid,
1848                                         cmd == BC_INCREFS_DONE ?
1849                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1850                                         node_ptr, node->debug_id,
1851                                         cookie, node->cookie);
1852                                 break;
1853                         }
1854                         if (cmd == BC_ACQUIRE_DONE) {
1855                                 if (node->pending_strong_ref == 0) {
1856                                         binder_user_error("binder: %d:%d "
1857                                                 "BC_ACQUIRE_DONE node %d has "
1858                                                 "no pending acquire request\n",
1859                                                 proc->pid, thread->pid,
1860                                                 node->debug_id);
1861                                         break;
1862                                 }
1863                                 node->pending_strong_ref = 0;
1864                         } else {
1865                                 if (node->pending_weak_ref == 0) {
1866                                         binder_user_error("binder: %d:%d "
1867                                                 "BC_INCREFS_DONE node %d has "
1868                                                 "no pending increfs request\n",
1869                                                 proc->pid, thread->pid,
1870                                                 node->debug_id);
1871                                         break;
1872                                 }
1873                                 node->pending_weak_ref = 0;
1874                         }
1875                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1876                         binder_debug(BINDER_DEBUG_USER_REFS,
1877                                      "binder: %d:%d %s node %d ls %d lw %d\n",
1878                                      proc->pid, thread->pid,
1879                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1880                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1881                         break;
1882                 }
1883                 case BC_ATTEMPT_ACQUIRE:
1884                         printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported\n");
1885                         return -EINVAL;
1886                 case BC_ACQUIRE_RESULT:
1887                         printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported\n");
1888                         return -EINVAL;
1889
1890                 case BC_FREE_BUFFER: {
1891                         void __user *data_ptr;
1892                         struct binder_buffer *buffer;
1893
1894                         if (get_user(data_ptr, (void * __user *)ptr))
1895                                 return -EFAULT;
1896                         ptr += sizeof(void *);
1897
1898                         buffer = binder_buffer_lookup(proc, data_ptr);
1899                         if (buffer == NULL) {
1900                                 binder_user_error("binder: %d:%d "
1901                                         "BC_FREE_BUFFER u%p no match\n",
1902                                         proc->pid, thread->pid, data_ptr);
1903                                 break;
1904                         }
1905                         if (!buffer->allow_user_free) {
1906                                 binder_user_error("binder: %d:%d "
1907                                         "BC_FREE_BUFFER u%p matched "
1908                                         "unreturned buffer\n",
1909                                         proc->pid, thread->pid, data_ptr);
1910                                 break;
1911                         }
1912                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1913                                      "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1914                                      proc->pid, thread->pid, data_ptr, buffer->debug_id,
1915                                      buffer->transaction ? "active" : "finished");
1916
1917                         if (buffer->transaction) {
1918                                 buffer->transaction->buffer = NULL;
1919                                 buffer->transaction = NULL;
1920                         }
1921                         if (buffer->async_transaction && buffer->target_node) {
1922                                 BUG_ON(!buffer->target_node->has_async_transaction);
1923                                 if (list_empty(&buffer->target_node->async_todo))
1924                                         buffer->target_node->has_async_transaction = 0;
1925                                 else
1926                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1927                         }
1928                         binder_transaction_buffer_release(proc, buffer, NULL);
1929                         binder_free_buf(proc, buffer);
1930                         break;
1931                 }
1932
1933                 case BC_TRANSACTION:
1934                 case BC_REPLY: {
1935                         struct binder_transaction_data tr;
1936
1937                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1938                                 return -EFAULT;
1939                         ptr += sizeof(tr);
1940                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1941                         break;
1942                 }
1943
1944                 case BC_REGISTER_LOOPER:
1945                         binder_debug(BINDER_DEBUG_THREADS,
1946                                      "binder: %d:%d BC_REGISTER_LOOPER\n",
1947                                      proc->pid, thread->pid);
1948                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1949                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1950                                 binder_user_error("binder: %d:%d ERROR:"
1951                                         " BC_REGISTER_LOOPER called "
1952                                         "after BC_ENTER_LOOPER\n",
1953                                         proc->pid, thread->pid);
1954                         } else if (proc->requested_threads == 0) {
1955                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1956                                 binder_user_error("binder: %d:%d ERROR:"
1957                                         " BC_REGISTER_LOOPER called "
1958                                         "without request\n",
1959                                         proc->pid, thread->pid);
1960                         } else {
1961                                 proc->requested_threads--;
1962                                 proc->requested_threads_started++;
1963                         }
1964                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1965                         break;
1966                 case BC_ENTER_LOOPER:
1967                         binder_debug(BINDER_DEBUG_THREADS,
1968                                      "binder: %d:%d BC_ENTER_LOOPER\n",
1969                                      proc->pid, thread->pid);
1970                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1971                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1972                                 binder_user_error("binder: %d:%d ERROR:"
1973                                         " BC_ENTER_LOOPER called after "
1974                                         "BC_REGISTER_LOOPER\n",
1975                                         proc->pid, thread->pid);
1976                         }
1977                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1978                         break;
1979                 case BC_EXIT_LOOPER:
1980                         binder_debug(BINDER_DEBUG_THREADS,
1981                                      "binder: %d:%d BC_EXIT_LOOPER\n",
1982                                      proc->pid, thread->pid);
1983                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1984                         break;
1985
1986                 case BC_REQUEST_DEATH_NOTIFICATION:
1987                 case BC_CLEAR_DEATH_NOTIFICATION: {
1988                         uint32_t target;
1989                         void __user *cookie;
1990                         struct binder_ref *ref;
1991                         struct binder_ref_death *death;
1992
1993                         if (get_user(target, (uint32_t __user *)ptr))
1994                                 return -EFAULT;
1995                         ptr += sizeof(uint32_t);
1996                         if (get_user(cookie, (void __user * __user *)ptr))
1997                                 return -EFAULT;
1998                         ptr += sizeof(void *);
1999                         ref = binder_get_ref(proc, target);
2000                         if (ref == NULL) {
2001                                 binder_user_error("binder: %d:%d %s "
2002                                         "invalid ref %d\n",
2003                                         proc->pid, thread->pid,
2004                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2005                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2006                                         "BC_CLEAR_DEATH_NOTIFICATION",
2007                                         target);
2008                                 break;
2009                         }
2010
2011                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2012                                      "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
2013                                      proc->pid, thread->pid,
2014                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2015                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2016                                      "BC_CLEAR_DEATH_NOTIFICATION",
2017                                      cookie, ref->debug_id, ref->desc,
2018                                      ref->strong, ref->weak, ref->node->debug_id);
2019
2020                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2021                                 if (ref->death) {
2022                                         binder_user_error("binder: %d:%"
2023                                                 "d BC_REQUEST_DEATH_NOTI"
2024                                                 "FICATION death notific"
2025                                                 "ation already set\n",
2026                                                 proc->pid, thread->pid);
2027                                         break;
2028                                 }
2029                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2030                                 if (death == NULL) {
2031                                         thread->return_error = BR_ERROR;
2032                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2033                                                      "binder: %d:%d "
2034                                                      "BC_REQUEST_DEATH_NOTIFICATION failed\n",
2035                                                      proc->pid, thread->pid);
2036                                         break;
2037                                 }
2038                                 binder_stats.obj_created[BINDER_STAT_DEATH]++;
2039                                 INIT_LIST_HEAD(&death->work.entry);
2040                                 death->cookie = cookie;
2041                                 ref->death = death;
2042                                 if (ref->node->proc == NULL) {
2043                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2044                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2045                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2046                                         } else {
2047                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2048                                                 wake_up_interruptible(&proc->wait);
2049                                         }
2050                                 }
2051                         } else {
2052                                 if (ref->death == NULL) {
2053                                         binder_user_error("binder: %d:%"
2054                                                 "d BC_CLEAR_DEATH_NOTIFI"
2055                                                 "CATION death notificat"
2056                                                 "ion not active\n",
2057                                                 proc->pid, thread->pid);
2058                                         break;
2059                                 }
2060                                 death = ref->death;
2061                                 if (death->cookie != cookie) {
2062                                         binder_user_error("binder: %d:%"
2063                                                 "d BC_CLEAR_DEATH_NOTIFI"
2064                                                 "CATION death notificat"
2065                                                 "ion cookie mismatch "
2066                                                 "%p != %p\n",
2067                                                 proc->pid, thread->pid,
2068                                                 death->cookie, cookie);
2069                                         break;
2070                                 }
2071                                 ref->death = NULL;
2072                                 if (list_empty(&death->work.entry)) {
2073                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2074                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2075                                                 list_add_tail(&death->work.entry, &thread->todo);
2076                                         } else {
2077                                                 list_add_tail(&death->work.entry, &proc->todo);
2078                                                 wake_up_interruptible(&proc->wait);
2079                                         }
2080                                 } else {
2081                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2082                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2083                                 }
2084                         }
2085                 } break;
2086                 case BC_DEAD_BINDER_DONE: {
2087                         struct binder_work *w;
2088                         void __user *cookie;
2089                         struct binder_ref_death *death = NULL;
2090                         if (get_user(cookie, (void __user * __user *)ptr))
2091                                 return -EFAULT;
2092
2093                         ptr += sizeof(void *);
2094                         list_for_each_entry(w, &proc->delivered_death, entry) {
2095                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2096                                 if (tmp_death->cookie == cookie) {
2097                                         death = tmp_death;
2098                                         break;
2099                                 }
2100                         }
2101                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2102                                      "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2103                                      proc->pid, thread->pid, cookie, death);
2104                         if (death == NULL) {
2105                                 binder_user_error("binder: %d:%d BC_DEAD"
2106                                         "_BINDER_DONE %p not found\n",
2107                                         proc->pid, thread->pid, cookie);
2108                                 break;
2109                         }
2110
2111                         list_del_init(&death->work.entry);
2112                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2113                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2114                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2115                                         list_add_tail(&death->work.entry, &thread->todo);
2116                                 } else {
2117                                         list_add_tail(&death->work.entry, &proc->todo);
2118                                         wake_up_interruptible(&proc->wait);
2119                                 }
2120                         }
2121                 } break;
2122
2123                 default:
2124                         printk(KERN_ERR "binder: %d:%d unknown command %d\n",
2125                                proc->pid, thread->pid, cmd);
2126                         return -EINVAL;
2127                 }
2128                 *consumed = ptr - buffer;
2129         }
2130         return 0;
2131 }
2132
2133 void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2134                     uint32_t cmd)
2135 {
2136         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2137                 binder_stats.br[_IOC_NR(cmd)]++;
2138                 proc->stats.br[_IOC_NR(cmd)]++;
2139                 thread->stats.br[_IOC_NR(cmd)]++;
2140         }
2141 }
2142
2143 static int binder_has_proc_work(struct binder_proc *proc,
2144                                 struct binder_thread *thread)
2145 {
2146         return !list_empty(&proc->todo) ||
2147                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2148 }
2149
2150 static int binder_has_thread_work(struct binder_thread *thread)
2151 {
2152         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2153                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2154 }
2155
2156 static int binder_thread_read(struct binder_proc *proc,
2157                               struct binder_thread *thread,
2158                               void  __user *buffer, int size,
2159                               signed long *consumed, int non_block)
2160 {
2161         void __user *ptr = buffer + *consumed;
2162         void __user *end = buffer + size;
2163
2164         int ret = 0;
2165         int wait_for_proc_work;
2166
2167         if (*consumed == 0) {
2168                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2169                         return -EFAULT;
2170                 ptr += sizeof(uint32_t);
2171         }
2172
2173 retry:
2174         wait_for_proc_work = thread->transaction_stack == NULL &&
2175                                 list_empty(&thread->todo);
2176
2177         if (thread->return_error != BR_OK && ptr < end) {
2178                 if (thread->return_error2 != BR_OK) {
2179                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2180                                 return -EFAULT;
2181                         ptr += sizeof(uint32_t);
2182                         if (ptr == end)
2183                                 goto done;
2184                         thread->return_error2 = BR_OK;
2185                 }
2186                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2187                         return -EFAULT;
2188                 ptr += sizeof(uint32_t);
2189                 thread->return_error = BR_OK;
2190                 goto done;
2191         }
2192
2193
2194         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2195         if (wait_for_proc_work)
2196                 proc->ready_threads++;
2197         mutex_unlock(&binder_lock);
2198         if (wait_for_proc_work) {
2199                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2200                                         BINDER_LOOPER_STATE_ENTERED))) {
2201                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
2202                                 "for process work before calling BC_REGISTER_"
2203                                 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2204                                 proc->pid, thread->pid, thread->looper);
2205                         wait_event_interruptible(binder_user_error_wait,
2206                                                  binder_stop_on_user_error < 2);
2207                 }
2208                 binder_set_nice(proc->default_priority);
2209                 if (non_block) {
2210                         if (!binder_has_proc_work(proc, thread))
2211                                 ret = -EAGAIN;
2212                 } else
2213                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2214         } else {
2215                 if (non_block) {
2216                         if (!binder_has_thread_work(thread))
2217                                 ret = -EAGAIN;
2218                 } else
2219                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2220         }
2221         mutex_lock(&binder_lock);
2222         if (wait_for_proc_work)
2223                 proc->ready_threads--;
2224         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2225
2226         if (ret)
2227                 return ret;
2228
2229         while (1) {
2230                 uint32_t cmd;
2231                 struct binder_transaction_data tr;
2232                 struct binder_work *w;
2233                 struct binder_transaction *t = NULL;
2234
2235                 if (!list_empty(&thread->todo))
2236                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2237                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2238                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2239                 else {
2240                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2241                                 goto retry;
2242                         break;
2243                 }
2244
2245                 if (end - ptr < sizeof(tr) + 4)
2246                         break;
2247
2248                 switch (w->type) {
2249                 case BINDER_WORK_TRANSACTION: {
2250                         t = container_of(w, struct binder_transaction, work);
2251                 } break;
2252                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2253                         cmd = BR_TRANSACTION_COMPLETE;
2254                         if (put_user(cmd, (uint32_t __user *)ptr))
2255                                 return -EFAULT;
2256                         ptr += sizeof(uint32_t);
2257
2258                         binder_stat_br(proc, thread, cmd);
2259                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2260                                      "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2261                                      proc->pid, thread->pid);
2262
2263                         list_del(&w->entry);
2264                         kfree(w);
2265                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2266                 } break;
2267                 case BINDER_WORK_NODE: {
2268                         struct binder_node *node = container_of(w, struct binder_node, work);
2269                         uint32_t cmd = BR_NOOP;
2270                         const char *cmd_name;
2271                         int strong = node->internal_strong_refs || node->local_strong_refs;
2272                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2273                         if (weak && !node->has_weak_ref) {
2274                                 cmd = BR_INCREFS;
2275                                 cmd_name = "BR_INCREFS";
2276                                 node->has_weak_ref = 1;
2277                                 node->pending_weak_ref = 1;
2278                                 node->local_weak_refs++;
2279                         } else if (strong && !node->has_strong_ref) {
2280                                 cmd = BR_ACQUIRE;
2281                                 cmd_name = "BR_ACQUIRE";
2282                                 node->has_strong_ref = 1;
2283                                 node->pending_strong_ref = 1;
2284                                 node->local_strong_refs++;
2285                         } else if (!strong && node->has_strong_ref) {
2286                                 cmd = BR_RELEASE;
2287                                 cmd_name = "BR_RELEASE";
2288                                 node->has_strong_ref = 0;
2289                         } else if (!weak && node->has_weak_ref) {
2290                                 cmd = BR_DECREFS;
2291                                 cmd_name = "BR_DECREFS";
2292                                 node->has_weak_ref = 0;
2293                         }
2294                         if (cmd != BR_NOOP) {
2295                                 if (put_user(cmd, (uint32_t __user *)ptr))
2296                                         return -EFAULT;
2297                                 ptr += sizeof(uint32_t);
2298                                 if (put_user(node->ptr, (void * __user *)ptr))
2299                                         return -EFAULT;
2300                                 ptr += sizeof(void *);
2301                                 if (put_user(node->cookie, (void * __user *)ptr))
2302                                         return -EFAULT;
2303                                 ptr += sizeof(void *);
2304
2305                                 binder_stat_br(proc, thread, cmd);
2306                                 binder_debug(BINDER_DEBUG_USER_REFS,
2307                                              "binder: %d:%d %s %d u%p c%p\n",
2308                                              proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2309                         } else {
2310                                 list_del_init(&w->entry);
2311                                 if (!weak && !strong) {
2312                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2313                                                      "binder: %d:%d node %d u%p c%p deleted\n",
2314                                                      proc->pid, thread->pid, node->debug_id,
2315                                                      node->ptr, node->cookie);
2316                                         rb_erase(&node->rb_node, &proc->nodes);
2317                                         kfree(node);
2318                                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2319                                 } else {
2320                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2321                                                      "binder: %d:%d node %d u%p c%p state unchanged\n",
2322                                                      proc->pid, thread->pid, node->debug_id, node->ptr,
2323                                                      node->cookie);
2324                                 }
2325                         }
2326                 } break;
2327                 case BINDER_WORK_DEAD_BINDER:
2328                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2329                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2330                         struct binder_ref_death *death;
2331                         uint32_t cmd;
2332
2333                         death = container_of(w, struct binder_ref_death, work);
2334                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2335                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2336                         else
2337                                 cmd = BR_DEAD_BINDER;
2338                         if (put_user(cmd, (uint32_t __user *)ptr))
2339                                 return -EFAULT;
2340                         ptr += sizeof(uint32_t);
2341                         if (put_user(death->cookie, (void * __user *)ptr))
2342                                 return -EFAULT;
2343                         ptr += sizeof(void *);
2344                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2345                                      "binder: %d:%d %s %p\n",
2346                                       proc->pid, thread->pid,
2347                                       cmd == BR_DEAD_BINDER ?
2348                                       "BR_DEAD_BINDER" :
2349                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2350                                       death->cookie);
2351
2352                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2353                                 list_del(&w->entry);
2354                                 kfree(death);
2355                                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
2356                         } else
2357                                 list_move(&w->entry, &proc->delivered_death);
2358                         if (cmd == BR_DEAD_BINDER)
2359                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2360                 } break;
2361                 }
2362
2363                 if (!t)
2364                         continue;
2365
2366                 BUG_ON(t->buffer == NULL);
2367                 if (t->buffer->target_node) {
2368                         struct binder_node *target_node = t->buffer->target_node;
2369                         tr.target.ptr = target_node->ptr;
2370                         tr.cookie =  target_node->cookie;
2371                         t->saved_priority = task_nice(current);
2372                         if (t->priority < target_node->min_priority &&
2373                             !(t->flags & TF_ONE_WAY))
2374                                 binder_set_nice(t->priority);
2375                         else if (!(t->flags & TF_ONE_WAY) ||
2376                                  t->saved_priority > target_node->min_priority)
2377                                 binder_set_nice(target_node->min_priority);
2378                         cmd = BR_TRANSACTION;
2379                 } else {
2380                         tr.target.ptr = NULL;
2381                         tr.cookie = NULL;
2382                         cmd = BR_REPLY;
2383                 }
2384                 tr.code = t->code;
2385                 tr.flags = t->flags;
2386                 tr.sender_euid = t->sender_euid;
2387
2388                 if (t->from) {
2389                         struct task_struct *sender = t->from->proc->tsk;
2390                         tr.sender_pid = task_tgid_nr_ns(sender,
2391                                                         current->nsproxy->pid_ns);
2392                 } else {
2393                         tr.sender_pid = 0;
2394                 }
2395
2396                 tr.data_size = t->buffer->data_size;
2397                 tr.offsets_size = t->buffer->offsets_size;
2398                 tr.data.ptr.buffer = (void *)t->buffer->data +
2399                                         proc->user_buffer_offset;
2400                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2401                                         ALIGN(t->buffer->data_size,
2402                                             sizeof(void *));
2403
2404                 if (put_user(cmd, (uint32_t __user *)ptr))
2405                         return -EFAULT;
2406                 ptr += sizeof(uint32_t);
2407                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2408                         return -EFAULT;
2409                 ptr += sizeof(tr);
2410
2411                 binder_stat_br(proc, thread, cmd);
2412                 binder_debug(BINDER_DEBUG_TRANSACTION,
2413                              "binder: %d:%d %s %d %d:%d, cmd %d"
2414                              "size %zd-%zd ptr %p-%p\n",
2415                              proc->pid, thread->pid,
2416                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2417                              "BR_REPLY",
2418                              t->debug_id, t->from ? t->from->proc->pid : 0,
2419                              t->from ? t->from->pid : 0, cmd,
2420                              t->buffer->data_size, t->buffer->offsets_size,
2421                              tr.data.ptr.buffer, tr.data.ptr.offsets);
2422
2423                 list_del(&t->work.entry);
2424                 t->buffer->allow_user_free = 1;
2425                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2426                         t->to_parent = thread->transaction_stack;
2427                         t->to_thread = thread;
2428                         thread->transaction_stack = t;
2429                 } else {
2430                         t->buffer->transaction = NULL;
2431                         kfree(t);
2432                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
2433                 }
2434                 break;
2435         }
2436
2437 done:
2438
2439         *consumed = ptr - buffer;
2440         if (proc->requested_threads + proc->ready_threads == 0 &&
2441             proc->requested_threads_started < proc->max_threads &&
2442             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2443              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2444              /*spawn a new thread if we leave this out */) {
2445                 proc->requested_threads++;
2446                 binder_debug(BINDER_DEBUG_THREADS,
2447                              "binder: %d:%d BR_SPAWN_LOOPER\n",
2448                              proc->pid, thread->pid);
2449                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2450                         return -EFAULT;
2451         }
2452         return 0;
2453 }
2454
2455 static void binder_release_work(struct list_head *list)
2456 {
2457         struct binder_work *w;
2458         while (!list_empty(list)) {
2459                 w = list_first_entry(list, struct binder_work, entry);
2460                 list_del_init(&w->entry);
2461                 switch (w->type) {
2462                 case BINDER_WORK_TRANSACTION: {
2463                         struct binder_transaction *t;
2464
2465                         t = container_of(w, struct binder_transaction, work);
2466                         if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
2467                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2468                 } break;
2469                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2470                         kfree(w);
2471                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2472                 } break;
2473                 default:
2474                         break;
2475                 }
2476         }
2477
2478 }
2479
2480 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2481 {
2482         struct binder_thread *thread = NULL;
2483         struct rb_node *parent = NULL;
2484         struct rb_node **p = &proc->threads.rb_node;
2485
2486         while (*p) {
2487                 parent = *p;
2488                 thread = rb_entry(parent, struct binder_thread, rb_node);
2489
2490                 if (current->pid < thread->pid)
2491                         p = &(*p)->rb_left;
2492                 else if (current->pid > thread->pid)
2493                         p = &(*p)->rb_right;
2494                 else
2495                         break;
2496         }
2497         if (*p == NULL) {
2498                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2499                 if (thread == NULL)
2500                         return NULL;
2501                 binder_stats.obj_created[BINDER_STAT_THREAD]++;
2502                 thread->proc = proc;
2503                 thread->pid = current->pid;
2504                 init_waitqueue_head(&thread->wait);
2505                 INIT_LIST_HEAD(&thread->todo);
2506                 rb_link_node(&thread->rb_node, parent, p);
2507                 rb_insert_color(&thread->rb_node, &proc->threads);
2508                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2509                 thread->return_error = BR_OK;
2510                 thread->return_error2 = BR_OK;
2511         }
2512         return thread;
2513 }
2514
2515 static int binder_free_thread(struct binder_proc *proc,
2516                               struct binder_thread *thread)
2517 {
2518         struct binder_transaction *t;
2519         struct binder_transaction *send_reply = NULL;
2520         int active_transactions = 0;
2521
2522         rb_erase(&thread->rb_node, &proc->threads);
2523         t = thread->transaction_stack;
2524         if (t && t->to_thread == thread)
2525                 send_reply = t;
2526         while (t) {
2527                 active_transactions++;
2528                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2529                              "binder: release %d:%d transaction %d "
2530                              "%s, still active\n", proc->pid, thread->pid,
2531                              t->debug_id,
2532                              (t->to_thread == thread) ? "in" : "out");
2533
2534                 if (t->to_thread == thread) {
2535                         t->to_proc = NULL;
2536                         t->to_thread = NULL;
2537                         if (t->buffer) {
2538                                 t->buffer->transaction = NULL;
2539                                 t->buffer = NULL;
2540                         }
2541                         t = t->to_parent;
2542                 } else if (t->from == thread) {
2543                         t->from = NULL;
2544                         t = t->from_parent;
2545                 } else
2546                         BUG();
2547         }
2548         if (send_reply)
2549                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2550         binder_release_work(&thread->todo);
2551         kfree(thread);
2552         binder_stats.obj_deleted[BINDER_STAT_THREAD]++;
2553         return active_transactions;
2554 }
2555
2556 static unsigned int binder_poll(struct file *filp,
2557                                 struct poll_table_struct *wait)
2558 {
2559         struct binder_proc *proc = filp->private_data;
2560         struct binder_thread *thread = NULL;
2561         int wait_for_proc_work;
2562
2563         mutex_lock(&binder_lock);
2564         thread = binder_get_thread(proc);
2565
2566         wait_for_proc_work = thread->transaction_stack == NULL &&
2567                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2568         mutex_unlock(&binder_lock);
2569
2570         if (wait_for_proc_work) {
2571                 if (binder_has_proc_work(proc, thread))
2572                         return POLLIN;
2573                 poll_wait(filp, &proc->wait, wait);
2574                 if (binder_has_proc_work(proc, thread))
2575                         return POLLIN;
2576         } else {
2577                 if (binder_has_thread_work(thread))
2578                         return POLLIN;
2579                 poll_wait(filp, &thread->wait, wait);
2580                 if (binder_has_thread_work(thread))
2581                         return POLLIN;
2582         }
2583         return 0;
2584 }
2585
2586 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2587 {
2588         int ret;
2589         struct binder_proc *proc = filp->private_data;
2590         struct binder_thread *thread;
2591         unsigned int size = _IOC_SIZE(cmd);
2592         void __user *ubuf = (void __user *)arg;
2593
2594         /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2595
2596         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2597         if (ret)
2598                 return ret;
2599
2600         mutex_lock(&binder_lock);
2601         thread = binder_get_thread(proc);
2602         if (thread == NULL) {
2603                 ret = -ENOMEM;
2604                 goto err;
2605         }
2606
2607         switch (cmd) {
2608         case BINDER_WRITE_READ: {
2609                 struct binder_write_read bwr;
2610                 if (size != sizeof(struct binder_write_read)) {
2611                         ret = -EINVAL;
2612                         goto err;
2613                 }
2614                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2615                         ret = -EFAULT;
2616                         goto err;
2617                 }
2618                 binder_debug(BINDER_DEBUG_READ_WRITE,
2619                              "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2620                              proc->pid, thread->pid, bwr.write_size, bwr.write_buffer,
2621                              bwr.read_size, bwr.read_buffer);
2622
2623                 if (bwr.write_size > 0) {
2624                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2625                         if (ret < 0) {
2626                                 bwr.read_consumed = 0;
2627                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2628                                         ret = -EFAULT;
2629                                 goto err;
2630                         }
2631                 }
2632                 if (bwr.read_size > 0) {
2633                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2634                         if (!list_empty(&proc->todo))
2635                                 wake_up_interruptible(&proc->wait);
2636                         if (ret < 0) {
2637                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2638                                         ret = -EFAULT;
2639                                 goto err;
2640                         }
2641                 }
2642                 binder_debug(BINDER_DEBUG_READ_WRITE,
2643                              "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2644                              proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2645                              bwr.read_consumed, bwr.read_size);
2646                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2647                         ret = -EFAULT;
2648                         goto err;
2649                 }
2650                 break;
2651         }
2652         case BINDER_SET_MAX_THREADS:
2653                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2654                         ret = -EINVAL;
2655                         goto err;
2656                 }
2657                 break;
2658         case BINDER_SET_CONTEXT_MGR:
2659                 if (binder_context_mgr_node != NULL) {
2660                         printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set\n");
2661                         ret = -EBUSY;
2662                         goto err;
2663                 }
2664                 if (binder_context_mgr_uid != -1) {
2665                         if (binder_context_mgr_uid != current->cred->euid) {
2666                                 printk(KERN_ERR "binder: BINDER_SET_"
2667                                        "CONTEXT_MGR bad uid %d != %d\n",
2668                                        current->cred->euid,
2669                                        binder_context_mgr_uid);
2670                                 ret = -EPERM;
2671                                 goto err;
2672                         }
2673                 } else
2674                         binder_context_mgr_uid = current->cred->euid;
2675                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2676                 if (binder_context_mgr_node == NULL) {
2677                         ret = -ENOMEM;
2678                         goto err;
2679                 }
2680                 binder_context_mgr_node->local_weak_refs++;
2681                 binder_context_mgr_node->local_strong_refs++;
2682                 binder_context_mgr_node->has_strong_ref = 1;
2683                 binder_context_mgr_node->has_weak_ref = 1;
2684                 break;
2685         case BINDER_THREAD_EXIT:
2686                 binder_debug(BINDER_DEBUG_THREADS, "binder: %d:%d exit\n",
2687                              proc->pid, thread->pid);
2688                 binder_free_thread(proc, thread);
2689                 thread = NULL;
2690                 break;
2691         case BINDER_VERSION:
2692                 if (size != sizeof(struct binder_version)) {
2693                         ret = -EINVAL;
2694                         goto err;
2695                 }
2696                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2697                         ret = -EINVAL;
2698                         goto err;
2699                 }
2700                 break;
2701         default:
2702                 ret = -EINVAL;
2703                 goto err;
2704         }
2705         ret = 0;
2706 err:
2707         if (thread)
2708                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2709         mutex_unlock(&binder_lock);
2710         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2711         if (ret && ret != -ERESTARTSYS)
2712                 printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2713         return ret;
2714 }
2715
2716 static void binder_vma_open(struct vm_area_struct *vma)
2717 {
2718         struct binder_proc *proc = vma->vm_private_data;
2719         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2720                      "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2721                      proc->pid, vma->vm_start, vma->vm_end,
2722                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2723                      (unsigned long)pgprot_val(vma->vm_page_prot));
2724         dump_stack();
2725 }
2726
2727 static void binder_vma_close(struct vm_area_struct *vma)
2728 {
2729         struct binder_proc *proc = vma->vm_private_data;
2730         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2731                      "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2732                      proc->pid, vma->vm_start, vma->vm_end,
2733                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2734                      (unsigned long)pgprot_val(vma->vm_page_prot));
2735         proc->vma = NULL;
2736         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2737 }
2738
2739 static struct vm_operations_struct binder_vm_ops = {
2740         .open = binder_vma_open,
2741         .close = binder_vma_close,
2742 };
2743
2744 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2745 {
2746         int ret;
2747         struct vm_struct *area;
2748         struct binder_proc *proc = filp->private_data;
2749         const char *failure_string;
2750         struct binder_buffer *buffer;
2751
2752         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2753                 vma->vm_end = vma->vm_start + SZ_4M;
2754
2755         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2756                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2757                      proc->pid, vma->vm_start, vma->vm_end,
2758                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2759                      (unsigned long)pgprot_val(vma->vm_page_prot));
2760
2761         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2762                 ret = -EPERM;
2763                 failure_string = "bad vm_flags";
2764                 goto err_bad_arg;
2765         }
2766         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2767
2768         if (proc->buffer) {
2769                 ret = -EBUSY;
2770                 failure_string = "already mapped";
2771                 goto err_already_mapped;
2772         }
2773
2774         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2775         if (area == NULL) {
2776                 ret = -ENOMEM;
2777                 failure_string = "get_vm_area";
2778                 goto err_get_vm_area_failed;
2779         }
2780         proc->buffer = area->addr;
2781         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2782
2783 #ifdef CONFIG_CPU_CACHE_VIPT
2784         if (cache_is_vipt_aliasing()) {
2785                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2786                         printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2787                         vma->vm_start += PAGE_SIZE;
2788                 }
2789         }
2790 #endif
2791         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2792         if (proc->pages == NULL) {
2793                 ret = -ENOMEM;
2794                 failure_string = "alloc page array";
2795                 goto err_alloc_pages_failed;
2796         }
2797         proc->buffer_size = vma->vm_end - vma->vm_start;
2798
2799         vma->vm_ops = &binder_vm_ops;
2800         vma->vm_private_data = proc;
2801
2802         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2803                 ret = -ENOMEM;
2804                 failure_string = "alloc small buf";
2805                 goto err_alloc_small_buf_failed;
2806         }
2807         buffer = proc->buffer;
2808         INIT_LIST_HEAD(&proc->buffers);
2809         list_add(&buffer->entry, &proc->buffers);
2810         buffer->free = 1;
2811         binder_insert_free_buffer(proc, buffer);
2812         proc->free_async_space = proc->buffer_size / 2;
2813         barrier();
2814         proc->files = get_files_struct(current);
2815         proc->vma = vma;
2816
2817         /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n",
2818                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2819         return 0;
2820
2821 err_alloc_small_buf_failed:
2822         kfree(proc->pages);
2823         proc->pages = NULL;
2824 err_alloc_pages_failed:
2825         vfree(proc->buffer);
2826         proc->buffer = NULL;
2827 err_get_vm_area_failed:
2828 err_already_mapped:
2829 err_bad_arg:
2830         printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n",
2831                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2832         return ret;
2833 }
2834
2835 static int binder_open(struct inode *nodp, struct file *filp)
2836 {
2837         struct binder_proc *proc;
2838
2839         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2840                      current->group_leader->pid, current->pid);
2841
2842         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2843         if (proc == NULL)
2844                 return -ENOMEM;
2845         get_task_struct(current);
2846         proc->tsk = current;
2847         INIT_LIST_HEAD(&proc->todo);
2848         init_waitqueue_head(&proc->wait);
2849         proc->default_priority = task_nice(current);
2850         mutex_lock(&binder_lock);
2851         binder_stats.obj_created[BINDER_STAT_PROC]++;
2852         hlist_add_head(&proc->proc_node, &binder_procs);
2853         proc->pid = current->group_leader->pid;
2854         INIT_LIST_HEAD(&proc->delivered_death);
2855         filp->private_data = proc;
2856         mutex_unlock(&binder_lock);
2857
2858         if (binder_proc_dir_entry_proc) {
2859                 char strbuf[11];
2860                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2861                 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2862                 create_proc_read_entry(strbuf, S_IRUGO,
2863                                        binder_proc_dir_entry_proc,
2864                                        binder_read_proc_proc, proc);
2865         }
2866
2867         return 0;
2868 }
2869
2870 static int binder_flush(struct file *filp, fl_owner_t id)
2871 {
2872         struct binder_proc *proc = filp->private_data;
2873
2874         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2875
2876         return 0;
2877 }
2878
2879 static void binder_deferred_flush(struct binder_proc *proc)
2880 {
2881         struct rb_node *n;
2882         int wake_count = 0;
2883         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2884                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2885                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2886                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2887                         wake_up_interruptible(&thread->wait);
2888                         wake_count++;
2889                 }
2890         }
2891         wake_up_interruptible_all(&proc->wait);
2892
2893         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2894                      "binder_flush: %d woke %d threads\n", proc->pid,
2895                      wake_count);
2896 }
2897
2898 static int binder_release(struct inode *nodp, struct file *filp)
2899 {
2900         struct binder_proc *proc = filp->private_data;
2901         if (binder_proc_dir_entry_proc) {
2902                 char strbuf[11];
2903                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2904                 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2905         }
2906
2907         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2908
2909         return 0;
2910 }
2911
2912 static void binder_deferred_release(struct binder_proc *proc)
2913 {
2914         struct hlist_node *pos;
2915         struct binder_transaction *t;
2916         struct rb_node *n;
2917         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2918
2919         BUG_ON(proc->vma);
2920         BUG_ON(proc->files);
2921
2922         hlist_del(&proc->proc_node);
2923         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2924                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2925                              "binder_release: %d context_mgr_node gone\n",
2926                              proc->pid);
2927                 binder_context_mgr_node = NULL;
2928         }
2929
2930         threads = 0;
2931         active_transactions = 0;
2932         while ((n = rb_first(&proc->threads))) {
2933                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2934                 threads++;
2935                 active_transactions += binder_free_thread(proc, thread);
2936         }
2937         nodes = 0;
2938         incoming_refs = 0;
2939         while ((n = rb_first(&proc->nodes))) {
2940                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2941
2942                 nodes++;
2943                 rb_erase(&node->rb_node, &proc->nodes);
2944                 list_del_init(&node->work.entry);
2945                 if (hlist_empty(&node->refs)) {
2946                         kfree(node);
2947                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2948                 } else {
2949                         struct binder_ref *ref;
2950                         int death = 0;
2951
2952                         node->proc = NULL;
2953                         node->local_strong_refs = 0;
2954                         node->local_weak_refs = 0;
2955                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2956
2957                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2958                                 incoming_refs++;
2959                                 if (ref->death) {
2960                                         death++;
2961                                         if (list_empty(&ref->death->work.entry)) {
2962                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2963                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2964                                                 wake_up_interruptible(&ref->proc->wait);
2965                                         } else
2966                                                 BUG();
2967                                 }
2968                         }
2969                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2970                                      "binder: node %d now dead, "
2971                                      "refs %d, death %d\n", node->debug_id,
2972                                      incoming_refs, death);
2973                 }
2974         }
2975         outgoing_refs = 0;
2976         while ((n = rb_first(&proc->refs_by_desc))) {
2977                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
2978                                                   rb_node_desc);
2979                 outgoing_refs++;
2980                 binder_delete_ref(ref);
2981         }
2982         binder_release_work(&proc->todo);
2983         buffers = 0;
2984
2985         while ((n = rb_first(&proc->allocated_buffers))) {
2986                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
2987                                                         rb_node);
2988                 t = buffer->transaction;
2989                 if (t) {
2990                         t->buffer = NULL;
2991                         buffer->transaction = NULL;
2992                         printk(KERN_ERR "binder: release proc %d, "
2993                                "transaction %d, not freed\n",
2994                                proc->pid, t->debug_id);
2995                         /*BUG();*/
2996                 }
2997                 binder_free_buf(proc, buffer);
2998                 buffers++;
2999         }
3000
3001         binder_stats.obj_deleted[BINDER_STAT_PROC]++;
3002
3003         page_count = 0;
3004         if (proc->pages) {
3005                 int i;
3006                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3007                         if (proc->pages[i]) {
3008                                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3009                                              "binder_release: %d: "
3010                                              "page %d at %p not freed\n",
3011                                              proc->pid, i,
3012                                              proc->buffer + i * PAGE_SIZE);
3013                                 __free_page(proc->pages[i]);
3014                                 page_count++;
3015                         }
3016                 }
3017                 kfree(proc->pages);
3018                 vfree(proc->buffer);
3019         }
3020
3021         put_task_struct(proc->tsk);
3022
3023         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3024                      "binder_release: %d threads %d, nodes %d (ref %d), "
3025                      "refs %d, active transactions %d, buffers %d, "
3026                      "pages %d\n",
3027                      proc->pid, threads, nodes, incoming_refs, outgoing_refs,
3028                      active_transactions, buffers, page_count);
3029
3030         kfree(proc);
3031 }
3032
3033 static void binder_deferred_func(struct work_struct *work)
3034 {
3035         struct binder_proc *proc;
3036         struct files_struct *files;
3037
3038         int defer;
3039         do {
3040                 mutex_lock(&binder_lock);
3041                 mutex_lock(&binder_deferred_lock);
3042                 if (!hlist_empty(&binder_deferred_list)) {
3043                         proc = hlist_entry(binder_deferred_list.first,
3044                                         struct binder_proc, deferred_work_node);
3045                         hlist_del_init(&proc->deferred_work_node);
3046                         defer = proc->deferred_work;
3047                         proc->deferred_work = 0;
3048                 } else {
3049                         proc = NULL;
3050                         defer = 0;
3051                 }
3052                 mutex_unlock(&binder_deferred_lock);
3053
3054                 files = NULL;
3055                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3056                         files = proc->files;
3057                         if (files)
3058                                 proc->files = NULL;
3059                 }
3060
3061                 if (defer & BINDER_DEFERRED_FLUSH)
3062                         binder_deferred_flush(proc);
3063
3064                 if (defer & BINDER_DEFERRED_RELEASE)
3065                         binder_deferred_release(proc); /* frees proc */
3066
3067                 mutex_unlock(&binder_lock);
3068                 if (files)
3069                         put_files_struct(files);
3070         } while (proc);
3071 }
3072 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3073
3074 static void binder_defer_work(struct binder_proc *proc, int defer)
3075 {
3076         mutex_lock(&binder_deferred_lock);
3077         proc->deferred_work |= defer;
3078         if (hlist_unhashed(&proc->deferred_work_node)) {
3079                 hlist_add_head(&proc->deferred_work_node,
3080                                 &binder_deferred_list);
3081                 schedule_work(&binder_deferred_work);
3082         }
3083         mutex_unlock(&binder_deferred_lock);
3084 }
3085
3086 static char *print_binder_transaction(char *buf, char *end, const char *prefix,
3087                                       struct binder_transaction *t)
3088 {
3089         buf += snprintf(buf, end - buf,
3090                         "%s %d: %p from %d:%d to %d:%d code %x "
3091                         "flags %x pri %ld r%d",
3092                         prefix, t->debug_id, t,
3093                         t->from ? t->from->proc->pid : 0,
3094                         t->from ? t->from->pid : 0,
3095                         t->to_proc ? t->to_proc->pid : 0,
3096                         t->to_thread ? t->to_thread->pid : 0,
3097                         t->code, t->flags, t->priority, t->need_reply);
3098         if (buf >= end)
3099                 return buf;
3100         if (t->buffer == NULL) {
3101                 buf += snprintf(buf, end - buf, " buffer free\n");
3102                 return buf;
3103         }
3104         if (t->buffer->target_node) {
3105                 buf += snprintf(buf, end - buf, " node %d",
3106                                 t->buffer->target_node->debug_id);
3107                 if (buf >= end)
3108                         return buf;
3109         }
3110         buf += snprintf(buf, end - buf, " size %zd:%zd data %p\n",
3111                         t->buffer->data_size, t->buffer->offsets_size,
3112                         t->buffer->data);
3113         return buf;
3114 }
3115
3116 static char *print_binder_buffer(char *buf, char *end, const char *prefix,
3117                                  struct binder_buffer *buffer)
3118 {
3119         buf += snprintf(buf, end - buf, "%s %d: %p size %zd:%zd %s\n",
3120                         prefix, buffer->debug_id, buffer->data,
3121                         buffer->data_size, buffer->offsets_size,
3122                         buffer->transaction ? "active" : "delivered");
3123         return buf;
3124 }
3125
3126 static char *print_binder_work(char *buf, char *end, const char *prefix,
3127                                const char *transaction_prefix,
3128                                struct binder_work *w)
3129 {
3130         struct binder_node *node;
3131         struct binder_transaction *t;
3132
3133         switch (w->type) {
3134         case BINDER_WORK_TRANSACTION:
3135                 t = container_of(w, struct binder_transaction, work);
3136                 buf = print_binder_transaction(buf, end, transaction_prefix, t);
3137                 break;
3138         case BINDER_WORK_TRANSACTION_COMPLETE:
3139                 buf += snprintf(buf, end - buf,
3140                                 "%stransaction complete\n", prefix);
3141                 break;
3142         case BINDER_WORK_NODE:
3143                 node = container_of(w, struct binder_node, work);
3144                 buf += snprintf(buf, end - buf, "%snode work %d: u%p c%p\n",
3145                                 prefix, node->debug_id, node->ptr,
3146                                 node->cookie);
3147                 break;
3148         case BINDER_WORK_DEAD_BINDER:
3149                 buf += snprintf(buf, end - buf, "%shas dead binder\n", prefix);
3150                 break;
3151         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3152                 buf += snprintf(buf, end - buf,
3153                                 "%shas cleared dead binder\n", prefix);
3154                 break;
3155         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3156                 buf += snprintf(buf, end - buf,
3157                                 "%shas cleared death notification\n", prefix);
3158                 break;
3159         default:
3160                 buf += snprintf(buf, end - buf, "%sunknown work: type %d\n",
3161                                 prefix, w->type);
3162                 break;
3163         }
3164         return buf;
3165 }
3166
3167 static char *print_binder_thread(char *buf, char *end,
3168                                  struct binder_thread *thread,
3169                                  int print_always)
3170 {
3171         struct binder_transaction *t;
3172         struct binder_work *w;
3173         char *start_buf = buf;
3174         char *header_buf;
3175
3176         buf += snprintf(buf, end - buf, "  thread %d: l %02x\n",
3177                         thread->pid, thread->looper);
3178         header_buf = buf;
3179         t = thread->transaction_stack;
3180         while (t) {
3181                 if (buf >= end)
3182                         break;
3183                 if (t->from == thread) {
3184                         buf = print_binder_transaction(buf, end,
3185                                                 "    outgoing transaction", t);
3186                         t = t->from_parent;
3187                 } else if (t->to_thread == thread) {
3188                         buf = print_binder_transaction(buf, end,
3189                                                 "    incoming transaction", t);
3190                         t = t->to_parent;
3191                 } else {
3192                         buf = print_binder_transaction(buf, end,
3193                                                 "    bad transaction", t);
3194                         t = NULL;
3195                 }
3196         }
3197         list_for_each_entry(w, &thread->todo, entry) {
3198                 if (buf >= end)
3199                         break;
3200                 buf = print_binder_work(buf, end, "    ",
3201                                         "    pending transaction", w);
3202         }
3203         if (!print_always && buf == header_buf)
3204                 buf = start_buf;
3205         return buf;
3206 }
3207
3208 static char *print_binder_node(char *buf, char *end, struct binder_node *node)
3209 {
3210         struct binder_ref *ref;
3211         struct hlist_node *pos;
3212         struct binder_work *w;
3213         int count;
3214
3215         count = 0;
3216         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3217                 count++;
3218
3219         buf += snprintf(buf, end - buf,
3220                         "  node %d: u%p c%p hs %d hw %d ls %d lw %d "
3221                         "is %d iw %d",
3222                         node->debug_id, node->ptr, node->cookie,
3223                         node->has_strong_ref, node->has_weak_ref,
3224                         node->local_strong_refs, node->local_weak_refs,
3225                         node->internal_strong_refs, count);
3226         if (buf >= end)
3227                 return buf;
3228         if (count) {
3229                 buf += snprintf(buf, end - buf, " proc");
3230                 if (buf >= end)
3231                         return buf;
3232                 hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
3233                         buf += snprintf(buf, end - buf, " %d", ref->proc->pid);
3234                         if (buf >= end)
3235                                 return buf;
3236                 }
3237         }
3238         buf += snprintf(buf, end - buf, "\n");
3239         list_for_each_entry(w, &node->async_todo, entry) {
3240                 if (buf >= end)
3241                         break;
3242                 buf = print_binder_work(buf, end, "    ",
3243                                         "    pending async transaction", w);
3244         }
3245         return buf;
3246 }
3247
3248 static char *print_binder_ref(char *buf, char *end, struct binder_ref *ref)
3249 {
3250         buf += snprintf(buf, end - buf,
3251                         "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3252                         ref->debug_id, ref->desc,
3253                         ref->node->proc ? "" : "dead ", ref->node->debug_id,
3254                         ref->strong, ref->weak, ref->death);
3255         return buf;
3256 }
3257
3258 static char *print_binder_proc(char *buf, char *end,
3259                                struct binder_proc *proc, int print_all)
3260 {
3261         struct binder_work *w;
3262         struct rb_node *n;
3263         char *start_buf = buf;
3264         char *header_buf;
3265
3266         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3267         header_buf = buf;
3268
3269         for (n = rb_first(&proc->threads);
3270              n != NULL && buf < end;
3271              n = rb_next(n))
3272                 buf = print_binder_thread(buf, end,
3273                                           rb_entry(n, struct binder_thread,
3274                                                    rb_node), print_all);
3275         for (n = rb_first(&proc->nodes);
3276              n != NULL && buf < end;
3277              n = rb_next(n)) {
3278                 struct binder_node *node = rb_entry(n, struct binder_node,
3279                                                     rb_node);
3280                 if (print_all || node->has_async_transaction)
3281                         buf = print_binder_node(buf, end, node);
3282         }
3283         if (print_all) {
3284                 for (n = rb_first(&proc->refs_by_desc);
3285                      n != NULL && buf < end;
3286                      n = rb_next(n))
3287                         buf = print_binder_ref(buf, end,
3288                                                rb_entry(n, struct binder_ref,
3289                                                         rb_node_desc));
3290         }
3291         for (n = rb_first(&proc->allocated_buffers);
3292              n != NULL && buf < end;
3293              n = rb_next(n))
3294                 buf = print_binder_buffer(buf, end, "  buffer",
3295                                           rb_entry(n, struct binder_buffer,
3296                                                    rb_node));
3297         list_for_each_entry(w, &proc->todo, entry) {
3298                 if (buf >= end)
3299                         break;
3300                 buf = print_binder_work(buf, end, "  ",
3301                                         "  pending transaction", w);
3302         }
3303         list_for_each_entry(w, &proc->delivered_death, entry) {
3304                 if (buf >= end)
3305                         break;
3306                 buf += snprintf(buf, end - buf,
3307                                 "  has delivered dead binder\n");
3308                 break;
3309         }
3310         if (!print_all && buf == header_buf)
3311                 buf = start_buf;
3312         return buf;
3313 }
3314
3315 static const char *binder_return_strings[] = {
3316         "BR_ERROR",
3317         "BR_OK",
3318         "BR_TRANSACTION",
3319         "BR_REPLY",
3320         "BR_ACQUIRE_RESULT",
3321         "BR_DEAD_REPLY",
3322         "BR_TRANSACTION_COMPLETE",
3323         "BR_INCREFS",
3324         "BR_ACQUIRE",
3325         "BR_RELEASE",
3326         "BR_DECREFS",
3327         "BR_ATTEMPT_ACQUIRE",
3328         "BR_NOOP",
3329         "BR_SPAWN_LOOPER",
3330         "BR_FINISHED",
3331         "BR_DEAD_BINDER",
3332         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3333         "BR_FAILED_REPLY"
3334 };
3335
3336 static const char *binder_command_strings[] = {
3337         "BC_TRANSACTION",
3338         "BC_REPLY",
3339         "BC_ACQUIRE_RESULT",
3340         "BC_FREE_BUFFER",
3341         "BC_INCREFS",
3342         "BC_ACQUIRE",
3343         "BC_RELEASE",
3344         "BC_DECREFS",
3345         "BC_INCREFS_DONE",
3346         "BC_ACQUIRE_DONE",
3347         "BC_ATTEMPT_ACQUIRE",
3348         "BC_REGISTER_LOOPER",
3349         "BC_ENTER_LOOPER",
3350         "BC_EXIT_LOOPER",
3351         "BC_REQUEST_DEATH_NOTIFICATION",
3352         "BC_CLEAR_DEATH_NOTIFICATION",
3353         "BC_DEAD_BINDER_DONE"
3354 };
3355
3356 static const char *binder_objstat_strings[] = {
3357         "proc",
3358         "thread",
3359         "node",
3360         "ref",
3361         "death",
3362         "transaction",
3363         "transaction_complete"
3364 };
3365
3366 static char *print_binder_stats(char *buf, char *end, const char *prefix,
3367                                 struct binder_stats *stats)
3368 {
3369         int i;
3370
3371         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3372                         ARRAY_SIZE(binder_command_strings));
3373         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3374                 if (stats->bc[i])
3375                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3376                                         binder_command_strings[i],
3377                                         stats->bc[i]);
3378                 if (buf >= end)
3379                         return buf;
3380         }
3381
3382         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3383                         ARRAY_SIZE(binder_return_strings));
3384         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3385                 if (stats->br[i])
3386                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3387                                         binder_return_strings[i], stats->br[i]);
3388                 if (buf >= end)
3389                         return buf;
3390         }
3391
3392         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3393                         ARRAY_SIZE(binder_objstat_strings));
3394         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3395                         ARRAY_SIZE(stats->obj_deleted));
3396         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3397                 if (stats->obj_created[i] || stats->obj_deleted[i])
3398                         buf += snprintf(buf, end - buf,
3399                                         "%s%s: active %d total %d\n", prefix,
3400                                         binder_objstat_strings[i],
3401                                         stats->obj_created[i] -
3402                                                 stats->obj_deleted[i],
3403                                         stats->obj_created[i]);
3404                 if (buf >= end)
3405                         return buf;
3406         }
3407         return buf;
3408 }
3409
3410 static char *print_binder_proc_stats(char *buf, char *end,
3411                                      struct binder_proc *proc)
3412 {
3413         struct binder_work *w;
3414         struct rb_node *n;
3415         int count, strong, weak;
3416
3417         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3418         if (buf >= end)
3419                 return buf;
3420         count = 0;
3421         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3422                 count++;
3423         buf += snprintf(buf, end - buf, "  threads: %d\n", count);
3424         if (buf >= end)
3425                 return buf;
3426         buf += snprintf(buf, end - buf, "  requested threads: %d+%d/%d\n"
3427                         "  ready threads %d\n"
3428                         "  free async space %zd\n", proc->requested_threads,
3429                         proc->requested_threads_started, proc->max_threads,
3430                         proc->ready_threads, proc->free_async_space);
3431         if (buf >= end)
3432                 return buf;
3433         count = 0;
3434         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3435                 count++;
3436         buf += snprintf(buf, end - buf, "  nodes: %d\n", count);
3437         if (buf >= end)
3438                 return buf;
3439         count = 0;
3440         strong = 0;
3441         weak = 0;
3442         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3443                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3444                                                   rb_node_desc);
3445                 count++;
3446                 strong += ref->strong;
3447                 weak += ref->weak;
3448         }
3449         buf += snprintf(buf, end - buf, "  refs: %d s %d w %d\n",
3450                         count, strong, weak);
3451         if (buf >= end)
3452                 return buf;
3453
3454         count = 0;
3455         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3456                 count++;
3457         buf += snprintf(buf, end - buf, "  buffers: %d\n", count);
3458         if (buf >= end)
3459                 return buf;
3460
3461         count = 0;
3462         list_for_each_entry(w, &proc->todo, entry) {
3463                 switch (w->type) {
3464                 case BINDER_WORK_TRANSACTION:
3465                         count++;
3466                         break;
3467                 default:
3468                         break;
3469                 }
3470         }
3471         buf += snprintf(buf, end - buf, "  pending transactions: %d\n", count);
3472         if (buf >= end)
3473                 return buf;
3474
3475         buf = print_binder_stats(buf, end, "  ", &proc->stats);
3476
3477         return buf;
3478 }
3479
3480
3481 static int binder_read_proc_state(char *page, char **start, off_t off,
3482                                   int count, int *eof, void *data)
3483 {
3484         struct binder_proc *proc;
3485         struct hlist_node *pos;
3486         struct binder_node *node;
3487         int len = 0;
3488         char *buf = page;
3489         char *end = page + PAGE_SIZE;
3490         int do_lock = !binder_debug_no_lock;
3491
3492         if (off)
3493                 return 0;
3494
3495         if (do_lock)
3496                 mutex_lock(&binder_lock);
3497
3498         buf += snprintf(buf, end - buf, "binder state:\n");
3499
3500         if (!hlist_empty(&binder_dead_nodes))
3501                 buf += snprintf(buf, end - buf, "dead nodes:\n");
3502         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) {
3503                 if (buf >= end)
3504                         break;
3505                 buf = print_binder_node(buf, end, node);
3506         }
3507
3508         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3509                 if (buf >= end)
3510                         break;
3511                 buf = print_binder_proc(buf, end, proc, 1);
3512         }
3513         if (do_lock)
3514                 mutex_unlock(&binder_lock);
3515         if (buf > page + PAGE_SIZE)
3516                 buf = page + PAGE_SIZE;
3517
3518         *start = page + off;
3519
3520         len = buf - page;
3521         if (len > off)
3522                 len -= off;
3523         else
3524                 len = 0;
3525
3526         return len < count ? len  : count;
3527 }
3528
3529 static int binder_read_proc_stats(char *page, char **start, off_t off,
3530                                   int count, int *eof, void *data)
3531 {
3532         struct binder_proc *proc;
3533         struct hlist_node *pos;
3534         int len = 0;
3535         char *p = page;
3536         int do_lock = !binder_debug_no_lock;
3537
3538         if (off)
3539                 return 0;
3540
3541         if (do_lock)
3542                 mutex_lock(&binder_lock);
3543
3544         p += snprintf(p, PAGE_SIZE, "binder stats:\n");
3545
3546         p = print_binder_stats(p, page + PAGE_SIZE, "", &binder_stats);
3547
3548         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3549                 if (p >= page + PAGE_SIZE)
3550                         break;
3551                 p = print_binder_proc_stats(p, page + PAGE_SIZE, proc);
3552         }
3553         if (do_lock)
3554                 mutex_unlock(&binder_lock);
3555         if (p > page + PAGE_SIZE)
3556                 p = page + PAGE_SIZE;
3557
3558         *start = page + off;
3559
3560         len = p - page;
3561         if (len > off)
3562                 len -= off;
3563         else
3564                 len = 0;
3565
3566         return len < count ? len  : count;
3567 }
3568
3569 static int binder_read_proc_transactions(char *page, char **start, off_t off,
3570                                          int count, int *eof, void *data)
3571 {
3572         struct binder_proc *proc;
3573         struct hlist_node *pos;
3574         int len = 0;
3575         char *buf = page;
3576         char *end = page + PAGE_SIZE;
3577         int do_lock = !binder_debug_no_lock;
3578
3579         if (off)
3580                 return 0;
3581
3582         if (do_lock)
3583                 mutex_lock(&binder_lock);
3584
3585         buf += snprintf(buf, end - buf, "binder transactions:\n");
3586         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3587                 if (buf >= end)
3588                         break;
3589                 buf = print_binder_proc(buf, end, proc, 0);
3590         }
3591         if (do_lock)
3592                 mutex_unlock(&binder_lock);
3593         if (buf > page + PAGE_SIZE)
3594                 buf = page + PAGE_SIZE;
3595
3596         *start = page + off;
3597
3598         len = buf - page;
3599         if (len > off)
3600                 len -= off;
3601         else
3602                 len = 0;
3603
3604         return len < count ? len  : count;
3605 }
3606
3607 static int binder_read_proc_proc(char *page, char **start, off_t off,
3608                                  int count, int *eof, void *data)
3609 {
3610         struct binder_proc *proc = data;
3611         int len = 0;
3612         char *p = page;
3613         int do_lock = !binder_debug_no_lock;
3614
3615         if (off)
3616                 return 0;
3617
3618         if (do_lock)
3619                 mutex_lock(&binder_lock);
3620         p += snprintf(p, PAGE_SIZE, "binder proc state:\n");
3621         p = print_binder_proc(p, page + PAGE_SIZE, proc, 1);
3622         if (do_lock)
3623                 mutex_unlock(&binder_lock);
3624
3625         if (p > page + PAGE_SIZE)
3626                 p = page + PAGE_SIZE;
3627         *start = page + off;
3628
3629         len = p - page;
3630         if (len > off)
3631                 len -= off;
3632         else
3633                 len = 0;
3634
3635         return len < count ? len  : count;
3636 }
3637
3638 static char *print_binder_transaction_log_entry(char *buf, char *end,
3639                                         struct binder_transaction_log_entry *e)
3640 {
3641         buf += snprintf(buf, end - buf,
3642                         "%d: %s from %d:%d to %d:%d node %d handle %d "
3643                         "size %d:%d\n",
3644                         e->debug_id, (e->call_type == 2) ? "reply" :
3645                         ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3646                         e->from_thread, e->to_proc, e->to_thread, e->to_node,
3647                         e->target_handle, e->data_size, e->offsets_size);
3648         return buf;
3649 }
3650
3651 static int binder_read_proc_transaction_log(
3652         char *page, char **start, off_t off, int count, int *eof, void *data)
3653 {
3654         struct binder_transaction_log *log = data;
3655         int len = 0;
3656         int i;
3657         char *buf = page;
3658         char *end = page + PAGE_SIZE;
3659
3660         if (off)
3661                 return 0;
3662
3663         if (log->full) {
3664                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++) {
3665                         if (buf >= end)
3666                                 break;
3667                         buf = print_binder_transaction_log_entry(buf, end,
3668                                                                 &log->entry[i]);
3669                 }
3670         }
3671         for (i = 0; i < log->next; i++) {
3672                 if (buf >= end)
3673                         break;
3674                 buf = print_binder_transaction_log_entry(buf, end,
3675                                                          &log->entry[i]);
3676         }
3677
3678         *start = page + off;
3679
3680         len = buf - page;
3681         if (len > off)
3682                 len -= off;
3683         else
3684                 len = 0;
3685
3686         return len < count ? len  : count;
3687 }
3688
3689 static const struct file_operations binder_fops = {
3690         .owner = THIS_MODULE,
3691         .poll = binder_poll,
3692         .unlocked_ioctl = binder_ioctl,
3693         .mmap = binder_mmap,
3694         .open = binder_open,
3695         .flush = binder_flush,
3696         .release = binder_release,
3697 };
3698
3699 static struct miscdevice binder_miscdev = {
3700         .minor = MISC_DYNAMIC_MINOR,
3701         .name = "binder",
3702         .fops = &binder_fops
3703 };
3704
3705 static int __init binder_init(void)
3706 {
3707         int ret;
3708
3709         binder_proc_dir_entry_root = proc_mkdir("binder", NULL);
3710         if (binder_proc_dir_entry_root)
3711                 binder_proc_dir_entry_proc = proc_mkdir("proc",
3712                                                 binder_proc_dir_entry_root);
3713         ret = misc_register(&binder_miscdev);
3714         if (binder_proc_dir_entry_root) {
3715                 create_proc_read_entry("state",
3716                                        S_IRUGO,
3717                                        binder_proc_dir_entry_root,
3718                                        binder_read_proc_state,
3719                                        NULL);
3720                 create_proc_read_entry("stats",
3721                                        S_IRUGO,
3722                                        binder_proc_dir_entry_root,
3723                                        binder_read_proc_stats,
3724                                        NULL);
3725                 create_proc_read_entry("transactions",
3726                                        S_IRUGO,
3727                                        binder_proc_dir_entry_root,
3728                                        binder_read_proc_transactions,
3729                                        NULL);
3730                 create_proc_read_entry("transaction_log",
3731                                        S_IRUGO,
3732                                        binder_proc_dir_entry_root,
3733                                        binder_read_proc_transaction_log,
3734                                        &binder_transaction_log);
3735                 create_proc_read_entry("failed_transaction_log",
3736                                        S_IRUGO,
3737                                        binder_proc_dir_entry_root,
3738                                        binder_read_proc_transaction_log,
3739                                        &binder_transaction_log_failed);
3740         }
3741         return ret;
3742 }
3743
3744 device_initcall(binder_init);
3745
3746 MODULE_LICENSE("GPL v2");