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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 binder_deferred_state {
 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
 330 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 331
 332 /*
 333  * copied from get_unused_fd_flags
 334  */
 335 int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 336 {
 337         struct files_struct *files = proc->files;
 338         int fd, error;
 339         struct fdtable *fdt;
 340         unsigned long rlim_cur;
 341         unsigned long irqs;
 342
 343         if (files == NULL)
 344                 return -ESRCH;
 345
 346         error = -EMFILE;
 347         spin_lock(&files->file_lock);
 348
 349 repeat:
 350         fdt = files_fdtable(files);
 351         fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
 352                                 files->next_fd);
 353
 354         /*
 355          * N.B. For clone tasks sharing a files structure, this test
 356          * will limit the total number of files that can be opened.
 357          */
 358         rlim_cur = 0;
 359         if (lock_task_sighand(proc->tsk, &irqs)) {
 360                 rlim_cur = proc->tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
 361                 unlock_task_sighand(proc->tsk, &irqs);
 362         }
 363         if (fd >= rlim_cur)
 364                 goto out;
 365
 366         /* Do we need to expand the fd array or fd set?  */
 367         error = expand_files(files, fd);
 368         if (error < 0)
 369                 goto out;
 370
 371         if (error) {
 372                 /*
 373                  * If we needed to expand the fs array we
 374                  * might have blocked - try again.
 375                  */
 376                 error = -EMFILE;
 377                 goto repeat;
 378         }
 379
 380         FD_SET(fd, fdt->open_fds);
 381         if (flags & O_CLOEXEC)
 382                 FD_SET(fd, fdt->close_on_exec);
 383         else
 384                 FD_CLR(fd, fdt->close_on_exec);
 385         files->next_fd = fd + 1;
 386 #if 1
 387         /* Sanity check */
 388         if (fdt->fd[fd] != NULL) {
 389                 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
 390                 fdt->fd[fd] = NULL;
 391         }
 392 #endif
 393         error = fd;
 394
 395 out:
 396         spin_unlock(&files->file_lock);
 397         return error;
 398 }
 399
 400 /*
 401  * copied from fd_install
 402  */
 403 static void task_fd_install(
 404         struct binder_proc *proc, unsigned int fd, struct file *file)
 405 {
 406         struct files_struct *files = proc->files;
 407         struct fdtable *fdt;
 408
 409         if (files == NULL)
 410                 return;
 411
 412         spin_lock(&files->file_lock);
 413         fdt = files_fdtable(files);
 414         BUG_ON(fdt->fd[fd] != NULL);
 415         rcu_assign_pointer(fdt->fd[fd], file);
 416         spin_unlock(&files->file_lock);
 417 }
 418
 419 /*
 420  * copied from __put_unused_fd in open.c
 421  */
 422 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 423 {
 424         struct fdtable *fdt = files_fdtable(files);
 425         __FD_CLR(fd, fdt->open_fds);
 426         if (fd < files->next_fd)
 427                 files->next_fd = fd;
 428 }
 429
 430 /*
 431  * copied from sys_close
 432  */
 433 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 434 {
 435         struct file *filp;
 436         struct files_struct *files = proc->files;
 437         struct fdtable *fdt;
 438         int retval;
 439
 440         if (files == NULL)
 441                 return -ESRCH;
 442
 443         spin_lock(&files->file_lock);
 444         fdt = files_fdtable(files);
 445         if (fd >= fdt->max_fds)
 446                 goto out_unlock;
 447         filp = fdt->fd[fd];
 448         if (!filp)
 449                 goto out_unlock;
 450         rcu_assign_pointer(fdt->fd[fd], NULL);
 451         FD_CLR(fd, fdt->close_on_exec);
 452         __put_unused_fd(files, fd);
 453         spin_unlock(&files->file_lock);
 454         retval = filp_close(filp, files);
 455
 456         /* can't restart close syscall because file table entry was cleared */
 457         if (unlikely(retval == -ERESTARTSYS ||
 458                      retval == -ERESTARTNOINTR ||
 459                      retval == -ERESTARTNOHAND ||
 460                      retval == -ERESTART_RESTARTBLOCK))
 461                 retval = -EINTR;
 462
 463         return retval;
 464
 465 out_unlock:
 466         spin_unlock(&files->file_lock);
 467         return -EBADF;
 468 }
 469
 470 static void binder_set_nice(long nice)
 471 {
 472         long min_nice;
 473         if (can_nice(current, nice)) {
 474                 set_user_nice(current, nice);
 475                 return;
 476         }
 477         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
 478         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 479                      "binder: %d: nice value %ld not allowed use "
 480                      "%ld instead\n", current->pid, nice, min_nice);
 481         set_user_nice(current, min_nice);
 482         if (min_nice < 20)
 483                 return;
 484         binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
 485 }
 486
 487 static size_t binder_buffer_size(struct binder_proc *proc,
 488                                  struct binder_buffer *buffer)
 489 {
 490         if (list_is_last(&buffer->entry, &proc->buffers))
 491                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 492         else
 493                 return (size_t)list_entry(buffer->entry.next,
 494                         struct binder_buffer, entry) - (size_t)buffer->data;
 495 }
 496
 497 static void binder_insert_free_buffer(struct binder_proc *proc,
 498                                       struct binder_buffer *new_buffer)
 499 {
 500         struct rb_node **p = &proc->free_buffers.rb_node;
 501         struct rb_node *parent = NULL;
 502         struct binder_buffer *buffer;
 503         size_t buffer_size;
 504         size_t new_buffer_size;
 505
 506         BUG_ON(!new_buffer->free);
 507
 508         new_buffer_size = binder_buffer_size(proc, new_buffer);
 509
 510         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 511                      "binder: %d: add free buffer, size %zd, "
 512                      "at %p\n", proc->pid, new_buffer_size, new_buffer);
 513
 514         while (*p) {
 515                 parent = *p;
 516                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 517                 BUG_ON(!buffer->free);
 518
 519                 buffer_size = binder_buffer_size(proc, buffer);
 520
 521                 if (new_buffer_size < buffer_size)
 522                         p = &parent->rb_left;
 523                 else
 524                         p = &parent->rb_right;
 525         }
 526         rb_link_node(&new_buffer->rb_node, parent, p);
 527         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 528 }
 529
 530 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 531                                            struct binder_buffer *new_buffer)
 532 {
 533         struct rb_node **p = &proc->allocated_buffers.rb_node;
 534         struct rb_node *parent = NULL;
 535         struct binder_buffer *buffer;
 536
 537         BUG_ON(new_buffer->free);
 538
 539         while (*p) {
 540                 parent = *p;
 541                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 542                 BUG_ON(buffer->free);
 543
 544                 if (new_buffer < buffer)
 545                         p = &parent->rb_left;
 546                 else if (new_buffer > buffer)
 547                         p = &parent->rb_right;
 548                 else
 549                         BUG();
 550         }
 551         rb_link_node(&new_buffer->rb_node, parent, p);
 552         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 553 }
 554
 555 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 556                                                   void __user *user_ptr)
 557 {
 558         struct rb_node *n = proc->allocated_buffers.rb_node;
 559         struct binder_buffer *buffer;
 560         struct binder_buffer *kern_ptr;
 561
 562         kern_ptr = user_ptr - proc->user_buffer_offset
 563                 - offsetof(struct binder_buffer, data);
 564
 565         while (n) {
 566                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 567                 BUG_ON(buffer->free);
 568
 569                 if (kern_ptr < buffer)
 570                         n = n->rb_left;
 571                 else if (kern_ptr > buffer)
 572                         n = n->rb_right;
 573                 else
 574                         return buffer;
 575         }
 576         return NULL;
 577 }
 578
 579 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 580                                     void *start, void *end,
 581                                     struct vm_area_struct *vma)
 582 {
 583         void *page_addr;
 584         unsigned long user_page_addr;
 585         struct vm_struct tmp_area;
 586         struct page **page;
 587         struct mm_struct *mm;
 588
 589         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 590                      "binder: %d: %s pages %p-%p\n", proc->pid,
 591                      allocate ? "allocate" : "free", start, end);
 592
 593         if (end <= start)
 594                 return 0;
 595
 596         if (vma)
 597                 mm = NULL;
 598         else
 599                 mm = get_task_mm(proc->tsk);
 600
 601         if (mm) {
 602                 down_write(&mm->mmap_sem);
 603                 vma = proc->vma;
 604         }
 605
 606         if (allocate == 0)
 607                 goto free_range;
 608
 609         if (vma == NULL) {
 610                 printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
 611                        "map pages in userspace, no vma\n", proc->pid);
 612                 goto err_no_vma;
 613         }
 614
 615         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 616                 int ret;
 617                 struct page **page_array_ptr;
 618                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 619
 620                 BUG_ON(*page);
 621                 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 622                 if (*page == NULL) {
 623                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 624                                "for page at %p\n", proc->pid, page_addr);
 625                         goto err_alloc_page_failed;
 626                 }
 627                 tmp_area.addr = page_addr;
 628                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
 629                 page_array_ptr = page;
 630                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
 631                 if (ret) {
 632                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 633                                "to map page at %p in kernel\n",
 634                                proc->pid, page_addr);
 635                         goto err_map_kernel_failed;
 636                 }
 637                 user_page_addr =
 638                         (uintptr_t)page_addr + proc->user_buffer_offset;
 639                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 640                 if (ret) {
 641                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 642                                "to map page at %lx in userspace\n",
 643                                proc->pid, user_page_addr);
 644                         goto err_vm_insert_page_failed;
 645                 }
 646                 /* vm_insert_page does not seem to increment the refcount */
 647         }
 648         if (mm) {
 649                 up_write(&mm->mmap_sem);
 650                 mmput(mm);
 651         }
 652         return 0;
 653
 654 free_range:
 655         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 656              page_addr -= PAGE_SIZE) {
 657                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 658                 if (vma)
 659                         zap_page_range(vma, (uintptr_t)page_addr +
 660                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 661 err_vm_insert_page_failed:
 662                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 663 err_map_kernel_failed:
 664                 __free_page(*page);
 665                 *page = NULL;
 666 err_alloc_page_failed:
 667                 ;
 668         }
 669 err_no_vma:
 670         if (mm) {
 671                 up_write(&mm->mmap_sem);
 672                 mmput(mm);
 673         }
 674         return -ENOMEM;
 675 }
 676
 677 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 678                                               size_t data_size,
 679                                               size_t offsets_size, int is_async)
 680 {
 681         struct rb_node *n = proc->free_buffers.rb_node;
 682         struct binder_buffer *buffer;
 683         size_t buffer_size;
 684         struct rb_node *best_fit = NULL;
 685         void *has_page_addr;
 686         void *end_page_addr;
 687         size_t size;
 688
 689         if (proc->vma == NULL) {
 690                 printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n",
 691                        proc->pid);
 692                 return NULL;
 693         }
 694
 695         size = ALIGN(data_size, sizeof(void *)) +
 696                 ALIGN(offsets_size, sizeof(void *));
 697
 698         if (size < data_size || size < offsets_size) {
 699                 binder_user_error("binder: %d: got transaction with invalid "
 700                         "size %zd-%zd\n", proc->pid, data_size, offsets_size);
 701                 return NULL;
 702         }
 703
 704         if (is_async &&
 705             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 706                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 707                              "binder: %d: binder_alloc_buf size %zd"
 708                              "failed, no async space left\n", proc->pid, size);
 709                 return NULL;
 710         }
 711
 712         while (n) {
 713                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 714                 BUG_ON(!buffer->free);
 715                 buffer_size = binder_buffer_size(proc, buffer);
 716
 717                 if (size < buffer_size) {
 718                         best_fit = n;
 719                         n = n->rb_left;
 720                 } else if (size > buffer_size)
 721                         n = n->rb_right;
 722                 else {
 723                         best_fit = n;
 724                         break;
 725                 }
 726         }
 727         if (best_fit == NULL) {
 728                 printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, "
 729                        "no address space\n", proc->pid, size);
 730                 return NULL;
 731         }
 732         if (n == NULL) {
 733                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 734                 buffer_size = binder_buffer_size(proc, buffer);
 735         }
 736
 737         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 738                      "binder: %d: binder_alloc_buf size %zd got buff"
 739                      "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
 740
 741         has_page_addr =
 742                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 743         if (n == NULL) {
 744                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 745                         buffer_size = size; /* no room for other buffers */
 746                 else
 747                         buffer_size = size + sizeof(struct binder_buffer);
 748         }
 749         end_page_addr =
 750                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 751         if (end_page_addr > has_page_addr)
 752                 end_page_addr = has_page_addr;
 753         if (binder_update_page_range(proc, 1,
 754             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 755                 return NULL;
 756
 757         rb_erase(best_fit, &proc->free_buffers);
 758         buffer->free = 0;
 759         binder_insert_allocated_buffer(proc, buffer);
 760         if (buffer_size != size) {
 761                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 762                 list_add(&new_buffer->entry, &buffer->entry);
 763                 new_buffer->free = 1;
 764                 binder_insert_free_buffer(proc, new_buffer);
 765         }
 766         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 767                      "binder: %d: binder_alloc_buf size %zd got "
 768                      "%p\n", proc->pid, size, buffer);
 769         buffer->data_size = data_size;
 770         buffer->offsets_size = offsets_size;
 771         buffer->async_transaction = is_async;
 772         if (is_async) {
 773                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 774                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 775                              "binder: %d: binder_alloc_buf size %zd "
 776                              "async free %zd\n", proc->pid, size,
 777                              proc->free_async_space);
 778         }
 779
 780         return buffer;
 781 }
 782
 783 static void *buffer_start_page(struct binder_buffer *buffer)
 784 {
 785         return (void *)((uintptr_t)buffer & PAGE_MASK);
 786 }
 787
 788 static void *buffer_end_page(struct binder_buffer *buffer)
 789 {
 790         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 791 }
 792
 793 static void binder_delete_free_buffer(struct binder_proc *proc,
 794                                       struct binder_buffer *buffer)
 795 {
 796         struct binder_buffer *prev, *next = NULL;
 797         int free_page_end = 1;
 798         int free_page_start = 1;
 799
 800         BUG_ON(proc->buffers.next == &buffer->entry);
 801         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 802         BUG_ON(!prev->free);
 803         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 804                 free_page_start = 0;
 805                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 806                         free_page_end = 0;
 807                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 808                              "binder: %d: merge free, buffer %p "
 809                              "share page with %p\n", proc->pid, buffer, prev);
 810         }
 811
 812         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 813                 next = list_entry(buffer->entry.next,
 814                                   struct binder_buffer, entry);
 815                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 816                         free_page_end = 0;
 817                         if (buffer_start_page(next) ==
 818                             buffer_start_page(buffer))
 819                                 free_page_start = 0;
 820                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 821                                      "binder: %d: merge free, buffer"
 822                                      " %p share page with %p\n", proc->pid,
 823                                      buffer, prev);
 824                 }
 825         }
 826         list_del(&buffer->entry);
 827         if (free_page_start || free_page_end) {
 828                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 829                              "binder: %d: merge free, buffer %p do "
 830                              "not share page%s%s with with %p or %p\n",
 831                              proc->pid, buffer, free_page_start ? "" : " end",
 832                              free_page_end ? "" : " start", prev, next);
 833                 binder_update_page_range(proc, 0, free_page_start ?
 834                         buffer_start_page(buffer) : buffer_end_page(buffer),
 835                         (free_page_end ? buffer_end_page(buffer) :
 836                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 837         }
 838 }
 839
 840 static void binder_free_buf(struct binder_proc *proc,
 841                             struct binder_buffer *buffer)
 842 {
 843         size_t size, buffer_size;
 844
 845         buffer_size = binder_buffer_size(proc, buffer);
 846
 847         size = ALIGN(buffer->data_size, sizeof(void *)) +
 848                 ALIGN(buffer->offsets_size, sizeof(void *));
 849
 850         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 851                      "binder: %d: binder_free_buf %p size %zd buffer"
 852                      "_size %zd\n", proc->pid, buffer, size, buffer_size);
 853
 854         BUG_ON(buffer->free);
 855         BUG_ON(size > buffer_size);
 856         BUG_ON(buffer->transaction != NULL);
 857         BUG_ON((void *)buffer < proc->buffer);
 858         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 859
 860         if (buffer->async_transaction) {
 861                 proc->free_async_space += size + sizeof(struct binder_buffer);
 862
 863                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 864                              "binder: %d: binder_free_buf size %zd "
 865                              "async free %zd\n", proc->pid, size,
 866                              proc->free_async_space);
 867         }
 868
 869         binder_update_page_range(proc, 0,
 870                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 871                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 872                 NULL);
 873         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 874         buffer->free = 1;
 875         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 876                 struct binder_buffer *next = list_entry(buffer->entry.next,
 877                                                 struct binder_buffer, entry);
 878                 if (next->free) {
 879                         rb_erase(&next->rb_node, &proc->free_buffers);
 880                         binder_delete_free_buffer(proc, next);
 881                 }
 882         }
 883         if (proc->buffers.next != &buffer->entry) {
 884                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 885                                                 struct binder_buffer, entry);
 886                 if (prev->free) {
 887                         binder_delete_free_buffer(proc, buffer);
 888                         rb_erase(&prev->rb_node, &proc->free_buffers);
 889                         buffer = prev;
 890                 }
 891         }
 892         binder_insert_free_buffer(proc, buffer);
 893 }
 894
 895 static struct binder_node *binder_get_node(struct binder_proc *proc,
 896                                            void __user *ptr)
 897 {
 898         struct rb_node *n = proc->nodes.rb_node;
 899         struct binder_node *node;
 900
 901         while (n) {
 902                 node = rb_entry(n, struct binder_node, rb_node);
 903
 904                 if (ptr < node->ptr)
 905                         n = n->rb_left;
 906                 else if (ptr > node->ptr)
 907                         n = n->rb_right;
 908                 else
 909                         return node;
 910         }
 911         return NULL;
 912 }
 913
 914 static struct binder_node *binder_new_node(struct binder_proc *proc,
 915                                            void __user *ptr,
 916                                            void __user *cookie)
 917 {
 918         struct rb_node **p = &proc->nodes.rb_node;
 919         struct rb_node *parent = NULL;
 920         struct binder_node *node;
 921
 922         while (*p) {
 923                 parent = *p;
 924                 node = rb_entry(parent, struct binder_node, rb_node);
 925
 926                 if (ptr < node->ptr)
 927                         p = &(*p)->rb_left;
 928                 else if (ptr > node->ptr)
 929                         p = &(*p)->rb_right;
 930                 else
 931                         return NULL;
 932         }
 933
 934         node = kzalloc(sizeof(*node), GFP_KERNEL);
 935         if (node == NULL)
 936                 return NULL;
 937         binder_stats.obj_created[BINDER_STAT_NODE]++;
 938         rb_link_node(&node->rb_node, parent, p);
 939         rb_insert_color(&node->rb_node, &proc->nodes);
 940         node->debug_id = ++binder_last_id;
 941         node->proc = proc;
 942         node->ptr = ptr;
 943         node->cookie = cookie;
 944         node->work.type = BINDER_WORK_NODE;
 945         INIT_LIST_HEAD(&node->work.entry);
 946         INIT_LIST_HEAD(&node->async_todo);
 947         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 948                      "binder: %d:%d node %d u%p c%p created\n",
 949                      proc->pid, current->pid, node->debug_id,
 950                      node->ptr, node->cookie);
 951         return node;
 952 }
 953
 954 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 955                            struct list_head *target_list)
 956 {
 957         if (strong) {
 958                 if (internal) {
 959                         if (target_list == NULL &&
 960                             node->internal_strong_refs == 0 &&
 961                             !(node == binder_context_mgr_node &&
 962                             node->has_strong_ref)) {
 963                                 printk(KERN_ERR "binder: invalid inc strong "
 964                                         "node for %d\n", node->debug_id);
 965                                 return -EINVAL;
 966                         }
 967                         node->internal_strong_refs++;
 968                 } else
 969                         node->local_strong_refs++;
 970                 if (!node->has_strong_ref && target_list) {
 971                         list_del_init(&node->work.entry);
 972                         list_add_tail(&node->work.entry, target_list);
 973                 }
 974         } else {
 975                 if (!internal)
 976                         node->local_weak_refs++;
 977                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 978                         if (target_list == NULL) {
 979                                 printk(KERN_ERR "binder: invalid inc weak node "
 980                                         "for %d\n", node->debug_id);
 981                                 return -EINVAL;
 982                         }
 983                         list_add_tail(&node->work.entry, target_list);
 984                 }
 985         }
 986         return 0;
 987 }
 988
 989 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 990 {
 991         if (strong) {
 992                 if (internal)
 993                         node->internal_strong_refs--;
 994                 else
 995                         node->local_strong_refs--;
 996                 if (node->local_strong_refs || node->internal_strong_refs)
 997                         return 0;
 998         } else {
 999                 if (!internal)
1000                         node->local_weak_refs--;
1001                 if (node->local_weak_refs || !hlist_empty(&node->refs))
1002                         return 0;
1003         }
1004         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
1005                 if (list_empty(&node->work.entry)) {
1006                         list_add_tail(&node->work.entry, &node->proc->todo);
1007                         wake_up_interruptible(&node->proc->wait);
1008                 }
1009         } else {
1010                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1011                     !node->local_weak_refs) {
1012                         list_del_init(&node->work.entry);
1013                         if (node->proc) {
1014                                 rb_erase(&node->rb_node, &node->proc->nodes);
1015                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1016                                              "binder: refless node %d deleted\n",
1017                                              node->debug_id);
1018                         } else {
1019                                 hlist_del(&node->dead_node);
1020                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1021                                              "binder: dead node %d deleted\n",
1022                                              node->debug_id);
1023                         }
1024                         kfree(node);
1025                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
1026                 }
1027         }
1028
1029         return 0;
1030 }
1031
1032
1033 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1034                                          uint32_t desc)
1035 {
1036         struct rb_node *n = proc->refs_by_desc.rb_node;
1037         struct binder_ref *ref;
1038
1039         while (n) {
1040                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1041
1042                 if (desc < ref->desc)
1043                         n = n->rb_left;
1044                 else if (desc > ref->desc)
1045                         n = n->rb_right;
1046                 else
1047                         return ref;
1048         }
1049         return NULL;
1050 }
1051
1052 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1053                                                   struct binder_node *node)
1054 {
1055         struct rb_node *n;
1056         struct rb_node **p = &proc->refs_by_node.rb_node;
1057         struct rb_node *parent = NULL;
1058         struct binder_ref *ref, *new_ref;
1059
1060         while (*p) {
1061                 parent = *p;
1062                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1063
1064                 if (node < ref->node)
1065                         p = &(*p)->rb_left;
1066                 else if (node > ref->node)
1067                         p = &(*p)->rb_right;
1068                 else
1069                         return ref;
1070         }
1071         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1072         if (new_ref == NULL)
1073                 return NULL;
1074         binder_stats.obj_created[BINDER_STAT_REF]++;
1075         new_ref->debug_id = ++binder_last_id;
1076         new_ref->proc = proc;
1077         new_ref->node = node;
1078         rb_link_node(&new_ref->rb_node_node, parent, p);
1079         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1080
1081         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1082         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1083                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1084                 if (ref->desc > new_ref->desc)
1085                         break;
1086                 new_ref->desc = ref->desc + 1;
1087         }
1088
1089         p = &proc->refs_by_desc.rb_node;
1090         while (*p) {
1091                 parent = *p;
1092                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1093
1094                 if (new_ref->desc < ref->desc)
1095                         p = &(*p)->rb_left;
1096                 else if (new_ref->desc > ref->desc)
1097                         p = &(*p)->rb_right;
1098                 else
1099                         BUG();
1100         }
1101         rb_link_node(&new_ref->rb_node_desc, parent, p);
1102         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1103         if (node) {
1104                 hlist_add_head(&new_ref->node_entry, &node->refs);
1105
1106                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1107                              "binder: %d new ref %d desc %d for "
1108                              "node %d\n", proc->pid, new_ref->debug_id,
1109                              new_ref->desc, node->debug_id);
1110         } else {
1111                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1112                              "binder: %d new ref %d desc %d for "
1113                              "dead node\n", proc->pid, new_ref->debug_id,
1114                               new_ref->desc);
1115         }
1116         return new_ref;
1117 }
1118
1119 static void binder_delete_ref(struct binder_ref *ref)
1120 {
1121         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1122                      "binder: %d delete ref %d desc %d for "
1123                      "node %d\n", ref->proc->pid, ref->debug_id,
1124                      ref->desc, ref->node->debug_id);
1125
1126         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1127         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1128         if (ref->strong)
1129                 binder_dec_node(ref->node, 1, 1);
1130         hlist_del(&ref->node_entry);
1131         binder_dec_node(ref->node, 0, 1);
1132         if (ref->death) {
1133                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1134                              "binder: %d delete ref %d desc %d "
1135                              "has death notification\n", ref->proc->pid,
1136                              ref->debug_id, ref->desc);
1137                 list_del(&ref->death->work.entry);
1138                 kfree(ref->death);
1139                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
1140         }
1141         kfree(ref);
1142         binder_stats.obj_deleted[BINDER_STAT_REF]++;
1143 }
1144
1145 static int binder_inc_ref(struct binder_ref *ref, int strong,
1146                           struct list_head *target_list)
1147 {
1148         int ret;
1149         if (strong) {
1150                 if (ref->strong == 0) {
1151                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1152                         if (ret)
1153                                 return ret;
1154                 }
1155                 ref->strong++;
1156         } else {
1157                 if (ref->weak == 0) {
1158                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1159                         if (ret)
1160                                 return ret;
1161                 }
1162                 ref->weak++;
1163         }
1164         return 0;
1165 }
1166
1167
1168 static int binder_dec_ref(struct binder_ref *ref, int strong)
1169 {
1170         if (strong) {
1171                 if (ref->strong == 0) {
1172                         binder_user_error("binder: %d invalid dec strong, "
1173                                           "ref %d desc %d s %d w %d\n",
1174                                           ref->proc->pid, ref->debug_id,
1175                                           ref->desc, ref->strong, ref->weak);
1176                         return -EINVAL;
1177                 }
1178                 ref->strong--;
1179                 if (ref->strong == 0) {
1180                         int ret;
1181                         ret = binder_dec_node(ref->node, strong, 1);
1182                         if (ret)
1183                                 return ret;
1184                 }
1185         } else {
1186                 if (ref->weak == 0) {
1187                         binder_user_error("binder: %d invalid dec weak, "
1188                                           "ref %d desc %d s %d w %d\n",
1189                                           ref->proc->pid, ref->debug_id,
1190                                           ref->desc, ref->strong, ref->weak);
1191                         return -EINVAL;
1192                 }
1193                 ref->weak--;
1194         }
1195         if (ref->strong == 0 && ref->weak == 0)
1196                 binder_delete_ref(ref);
1197         return 0;
1198 }
1199
1200 static void binder_pop_transaction(struct binder_thread *target_thread,
1201                                    struct binder_transaction *t)
1202 {
1203         if (target_thread) {
1204                 BUG_ON(target_thread->transaction_stack != t);
1205                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1206                 target_thread->transaction_stack =
1207                         target_thread->transaction_stack->from_parent;
1208                 t->from = NULL;
1209         }
1210         t->need_reply = 0;
1211         if (t->buffer)
1212                 t->buffer->transaction = NULL;
1213         kfree(t);
1214         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1215 }
1216
1217 static void binder_send_failed_reply(struct binder_transaction *t,
1218                                      uint32_t error_code)
1219 {
1220         struct binder_thread *target_thread;
1221         BUG_ON(t->flags & TF_ONE_WAY);
1222         while (1) {
1223                 target_thread = t->from;
1224                 if (target_thread) {
1225                         if (target_thread->return_error != BR_OK &&
1226                            target_thread->return_error2 == BR_OK) {
1227                                 target_thread->return_error2 =
1228                                         target_thread->return_error;
1229                                 target_thread->return_error = BR_OK;
1230                         }
1231                         if (target_thread->return_error == BR_OK) {
1232                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1233                                              "binder: send failed reply for "
1234                                              "transaction %d to %d:%d\n",
1235                                               t->debug_id, target_thread->proc->pid,
1236                                               target_thread->pid);
1237
1238                                 binder_pop_transaction(target_thread, t);
1239                                 target_thread->return_error = error_code;
1240                                 wake_up_interruptible(&target_thread->wait);
1241                         } else {
1242                                 printk(KERN_ERR "binder: reply failed, target "
1243                                         "thread, %d:%d, has error code %d "
1244                                         "already\n", target_thread->proc->pid,
1245                                         target_thread->pid,
1246                                         target_thread->return_error);
1247                         }
1248                         return;
1249                 } else {
1250                         struct binder_transaction *next = t->from_parent;
1251
1252                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1253                                      "binder: send failed reply "
1254                                      "for transaction %d, target dead\n",
1255                                      t->debug_id);
1256
1257                         binder_pop_transaction(target_thread, t);
1258                         if (next == NULL) {
1259                                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1260                                              "binder: reply failed,"
1261                                              " no target thread at root\n");
1262                                 return;
1263                         }
1264                         t = next;
1265                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1266                                      "binder: reply failed, no target "
1267                                      "thread -- retry %d\n", t->debug_id);
1268                 }
1269         }
1270 }
1271
1272 static void binder_transaction_buffer_release(struct binder_proc *proc,
1273                                               struct binder_buffer *buffer,
1274                                               size_t *failed_at)
1275 {
1276         size_t *offp, *off_end;
1277         int debug_id = buffer->debug_id;
1278
1279         binder_debug(BINDER_DEBUG_TRANSACTION,
1280                      "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1281                      proc->pid, buffer->debug_id,
1282                      buffer->data_size, buffer->offsets_size, failed_at);
1283
1284         if (buffer->target_node)
1285                 binder_dec_node(buffer->target_node, 1, 0);
1286
1287         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1288         if (failed_at)
1289                 off_end = failed_at;
1290         else
1291                 off_end = (void *)offp + buffer->offsets_size;
1292         for (; offp < off_end; offp++) {
1293                 struct flat_binder_object *fp;
1294                 if (*offp > buffer->data_size - sizeof(*fp) ||
1295                     buffer->data_size < sizeof(*fp) ||
1296                     !IS_ALIGNED(*offp, sizeof(void *))) {
1297                         printk(KERN_ERR "binder: transaction release %d bad"
1298                                         "offset %zd, size %zd\n", debug_id, *offp, buffer->data_size);
1299                         continue;
1300                 }
1301                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1302                 switch (fp->type) {
1303                 case BINDER_TYPE_BINDER:
1304                 case BINDER_TYPE_WEAK_BINDER: {
1305                         struct binder_node *node = binder_get_node(proc, fp->binder);
1306                         if (node == NULL) {
1307                                 printk(KERN_ERR "binder: transaction release %d bad node %p\n", debug_id, fp->binder);
1308                                 break;
1309                         }
1310                         binder_debug(BINDER_DEBUG_TRANSACTION,
1311                                      "        node %d u%p\n",
1312                                      node->debug_id, node->ptr);
1313                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1314                 } break;
1315                 case BINDER_TYPE_HANDLE:
1316                 case BINDER_TYPE_WEAK_HANDLE: {
1317                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1318                         if (ref == NULL) {
1319                                 printk(KERN_ERR "binder: transaction release %d bad handle %ld\n", debug_id, fp->handle);
1320                                 break;
1321                         }
1322                         binder_debug(BINDER_DEBUG_TRANSACTION,
1323                                      "        ref %d desc %d (node %d)\n",
1324                                      ref->debug_id, ref->desc, ref->node->debug_id);
1325                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1326                 } break;
1327
1328                 case BINDER_TYPE_FD:
1329                         binder_debug(BINDER_DEBUG_TRANSACTION,
1330                                      "        fd %ld\n", fp->handle);
1331                         if (failed_at)
1332                                 task_close_fd(proc, fp->handle);
1333                         break;
1334
1335                 default:
1336                         printk(KERN_ERR "binder: transaction release %d bad object type %lx\n", debug_id, fp->type);
1337                         break;
1338                 }
1339         }
1340 }
1341
1342 static void binder_transaction(struct binder_proc *proc,
1343                                struct binder_thread *thread,
1344                                struct binder_transaction_data *tr, int reply)
1345 {
1346         struct binder_transaction *t;
1347         struct binder_work *tcomplete;
1348         size_t *offp, *off_end;
1349         struct binder_proc *target_proc;
1350         struct binder_thread *target_thread = NULL;
1351         struct binder_node *target_node = NULL;
1352         struct list_head *target_list;
1353         wait_queue_head_t *target_wait;
1354         struct binder_transaction *in_reply_to = NULL;
1355         struct binder_transaction_log_entry *e;
1356         uint32_t return_error;
1357
1358         e = binder_transaction_log_add(&binder_transaction_log);
1359         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1360         e->from_proc = proc->pid;
1361         e->from_thread = thread->pid;
1362         e->target_handle = tr->target.handle;
1363         e->data_size = tr->data_size;
1364         e->offsets_size = tr->offsets_size;
1365
1366         if (reply) {
1367                 in_reply_to = thread->transaction_stack;
1368                 if (in_reply_to == NULL) {
1369                         binder_user_error("binder: %d:%d got reply transaction "
1370                                           "with no transaction stack\n",
1371                                           proc->pid, thread->pid);
1372                         return_error = BR_FAILED_REPLY;
1373                         goto err_empty_call_stack;
1374                 }
1375                 binder_set_nice(in_reply_to->saved_priority);
1376                 if (in_reply_to->to_thread != thread) {
1377                         binder_user_error("binder: %d:%d got reply transaction "
1378                                 "with bad transaction stack,"
1379                                 " transaction %d has target %d:%d\n",
1380                                 proc->pid, thread->pid, in_reply_to->debug_id,
1381                                 in_reply_to->to_proc ?
1382                                 in_reply_to->to_proc->pid : 0,
1383                                 in_reply_to->to_thread ?
1384                                 in_reply_to->to_thread->pid : 0);
1385                         return_error = BR_FAILED_REPLY;
1386                         in_reply_to = NULL;
1387                         goto err_bad_call_stack;
1388                 }
1389                 thread->transaction_stack = in_reply_to->to_parent;
1390                 target_thread = in_reply_to->from;
1391                 if (target_thread == NULL) {
1392                         return_error = BR_DEAD_REPLY;
1393                         goto err_dead_binder;
1394                 }
1395                 if (target_thread->transaction_stack != in_reply_to) {
1396                         binder_user_error("binder: %d:%d got reply transaction "
1397                                 "with bad target transaction stack %d, "
1398                                 "expected %d\n",
1399                                 proc->pid, thread->pid,
1400                                 target_thread->transaction_stack ?
1401                                 target_thread->transaction_stack->debug_id : 0,
1402                                 in_reply_to->debug_id);
1403                         return_error = BR_FAILED_REPLY;
1404                         in_reply_to = NULL;
1405                         target_thread = NULL;
1406                         goto err_dead_binder;
1407                 }
1408                 target_proc = target_thread->proc;
1409         } else {
1410                 if (tr->target.handle) {
1411                         struct binder_ref *ref;
1412                         ref = binder_get_ref(proc, tr->target.handle);
1413                         if (ref == NULL) {
1414                                 binder_user_error("binder: %d:%d got "
1415                                         "transaction to invalid handle\n",
1416                                         proc->pid, thread->pid);
1417                                 return_error = BR_FAILED_REPLY;
1418                                 goto err_invalid_target_handle;
1419                         }
1420                         target_node = ref->node;
1421                 } else {
1422                         target_node = binder_context_mgr_node;
1423                         if (target_node == NULL) {
1424                                 return_error = BR_DEAD_REPLY;
1425                                 goto err_no_context_mgr_node;
1426                         }
1427                 }
1428                 e->to_node = target_node->debug_id;
1429                 target_proc = target_node->proc;
1430                 if (target_proc == NULL) {
1431                         return_error = BR_DEAD_REPLY;
1432                         goto err_dead_binder;
1433                 }
1434                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1435                         struct binder_transaction *tmp;
1436                         tmp = thread->transaction_stack;
1437                         if (tmp->to_thread != thread) {
1438                                 binder_user_error("binder: %d:%d got new "
1439                                         "transaction with bad transaction stack"
1440                                         ", transaction %d has target %d:%d\n",
1441                                         proc->pid, thread->pid, tmp->debug_id,
1442                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1443                                         tmp->to_thread ?
1444                                         tmp->to_thread->pid : 0);
1445                                 return_error = BR_FAILED_REPLY;
1446                                 goto err_bad_call_stack;
1447                         }
1448                         while (tmp) {
1449                                 if (tmp->from && tmp->from->proc == target_proc)
1450                                         target_thread = tmp->from;
1451                                 tmp = tmp->from_parent;
1452                         }
1453                 }
1454         }
1455         if (target_thread) {
1456                 e->to_thread = target_thread->pid;
1457                 target_list = &target_thread->todo;
1458                 target_wait = &target_thread->wait;
1459         } else {
1460                 target_list = &target_proc->todo;
1461                 target_wait = &target_proc->wait;
1462         }
1463         e->to_proc = target_proc->pid;
1464
1465         /* TODO: reuse incoming transaction for reply */
1466         t = kzalloc(sizeof(*t), GFP_KERNEL);
1467         if (t == NULL) {
1468                 return_error = BR_FAILED_REPLY;
1469                 goto err_alloc_t_failed;
1470         }
1471         binder_stats.obj_created[BINDER_STAT_TRANSACTION]++;
1472
1473         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1474         if (tcomplete == NULL) {
1475                 return_error = BR_FAILED_REPLY;
1476                 goto err_alloc_tcomplete_failed;
1477         }
1478         binder_stats.obj_created[BINDER_STAT_TRANSACTION_COMPLETE]++;
1479
1480         t->debug_id = ++binder_last_id;
1481         e->debug_id = t->debug_id;
1482
1483         if (reply)
1484                 binder_debug(BINDER_DEBUG_TRANSACTION,
1485                              "binder: %d:%d BC_REPLY %d -> %d:%d, "
1486                              "data %p-%p size %zd-%zd\n",
1487                              proc->pid, thread->pid, t->debug_id,
1488                              target_proc->pid, target_thread->pid,
1489                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1490                              tr->data_size, tr->offsets_size);
1491         else
1492                 binder_debug(BINDER_DEBUG_TRANSACTION,
1493                              "binder: %d:%d BC_TRANSACTION %d -> "
1494                              "%d - node %d, data %p-%p size %zd-%zd\n",
1495                              proc->pid, thread->pid, t->debug_id,
1496                              target_proc->pid, target_node->debug_id,
1497                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1498                              tr->data_size, tr->offsets_size);
1499
1500         if (!reply && !(tr->flags & TF_ONE_WAY))
1501                 t->from = thread;
1502         else
1503                 t->from = NULL;
1504         t->sender_euid = proc->tsk->cred->euid;
1505         t->to_proc = target_proc;
1506         t->to_thread = target_thread;
1507         t->code = tr->code;
1508         t->flags = tr->flags;
1509         t->priority = task_nice(current);
1510         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1511                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1512         if (t->buffer == NULL) {
1513                 return_error = BR_FAILED_REPLY;
1514                 goto err_binder_alloc_buf_failed;
1515         }
1516         t->buffer->allow_user_free = 0;
1517         t->buffer->debug_id = t->debug_id;
1518         t->buffer->transaction = t;
1519         t->buffer->target_node = target_node;
1520         if (target_node)
1521                 binder_inc_node(target_node, 1, 0, NULL);
1522
1523         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1524
1525         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1526                 binder_user_error("binder: %d:%d got transaction with invalid "
1527                         "data ptr\n", proc->pid, thread->pid);
1528                 return_error = BR_FAILED_REPLY;
1529                 goto err_copy_data_failed;
1530         }
1531         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1532                 binder_user_error("binder: %d:%d got transaction with invalid "
1533                         "offsets ptr\n", proc->pid, thread->pid);
1534                 return_error = BR_FAILED_REPLY;
1535                 goto err_copy_data_failed;
1536         }
1537         if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1538                 binder_user_error("binder: %d:%d got transaction with "
1539                         "invalid offsets size, %zd\n",
1540                         proc->pid, thread->pid, tr->offsets_size);
1541                 return_error = BR_FAILED_REPLY;
1542                 goto err_bad_offset;
1543         }
1544         off_end = (void *)offp + tr->offsets_size;
1545         for (; offp < off_end; offp++) {
1546                 struct flat_binder_object *fp;
1547                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1548                     t->buffer->data_size < sizeof(*fp) ||
1549                     !IS_ALIGNED(*offp, sizeof(void *))) {
1550                         binder_user_error("binder: %d:%d got transaction with "
1551                                 "invalid offset, %zd\n",
1552                                 proc->pid, thread->pid, *offp);
1553                         return_error = BR_FAILED_REPLY;
1554                         goto err_bad_offset;
1555                 }
1556                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1557                 switch (fp->type) {
1558                 case BINDER_TYPE_BINDER:
1559                 case BINDER_TYPE_WEAK_BINDER: {
1560                         struct binder_ref *ref;
1561                         struct binder_node *node = binder_get_node(proc, fp->binder);
1562                         if (node == NULL) {
1563                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1564                                 if (node == NULL) {
1565                                         return_error = BR_FAILED_REPLY;
1566                                         goto err_binder_new_node_failed;
1567                                 }
1568                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1569                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1570                         }
1571                         if (fp->cookie != node->cookie) {
1572                                 binder_user_error("binder: %d:%d sending u%p "
1573                                         "node %d, cookie mismatch %p != %p\n",
1574                                         proc->pid, thread->pid,
1575                                         fp->binder, node->debug_id,
1576                                         fp->cookie, node->cookie);
1577                                 goto err_binder_get_ref_for_node_failed;
1578                         }
1579                         ref = binder_get_ref_for_node(target_proc, node);
1580                         if (ref == NULL) {
1581                                 return_error = BR_FAILED_REPLY;
1582                                 goto err_binder_get_ref_for_node_failed;
1583                         }
1584                         if (fp->type == BINDER_TYPE_BINDER)
1585                                 fp->type = BINDER_TYPE_HANDLE;
1586                         else
1587                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1588                         fp->handle = ref->desc;
1589                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE, &thread->todo);
1590
1591                         binder_debug(BINDER_DEBUG_TRANSACTION,
1592                                      "        node %d u%p -> ref %d desc %d\n",
1593                                      node->debug_id, node->ptr, ref->debug_id,
1594                                      ref->desc);
1595                 } break;
1596                 case BINDER_TYPE_HANDLE:
1597                 case BINDER_TYPE_WEAK_HANDLE: {
1598                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1599                         if (ref == NULL) {
1600                                 binder_user_error("binder: %d:%d got "
1601                                         "transaction with invalid "
1602                                         "handle, %ld\n", proc->pid,
1603                                         thread->pid, fp->handle);
1604                                 return_error = BR_FAILED_REPLY;
1605                                 goto err_binder_get_ref_failed;
1606                         }
1607                         if (ref->node->proc == target_proc) {
1608                                 if (fp->type == BINDER_TYPE_HANDLE)
1609                                         fp->type = BINDER_TYPE_BINDER;
1610                                 else
1611                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1612                                 fp->binder = ref->node->ptr;
1613                                 fp->cookie = ref->node->cookie;
1614                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1615                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1616                                              "        ref %d desc %d -> node %d u%p\n",
1617                                              ref->debug_id, ref->desc, ref->node->debug_id,
1618                                              ref->node->ptr);
1619                         } else {
1620                                 struct binder_ref *new_ref;
1621                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1622                                 if (new_ref == NULL) {
1623                                         return_error = BR_FAILED_REPLY;
1624                                         goto err_binder_get_ref_for_node_failed;
1625                                 }
1626                                 fp->handle = new_ref->desc;
1627                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1628                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1629                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1630                                              ref->debug_id, ref->desc, new_ref->debug_id,
1631                                              new_ref->desc, ref->node->debug_id);
1632                         }
1633                 } break;
1634
1635                 case BINDER_TYPE_FD: {
1636                         int target_fd;
1637                         struct file *file;
1638
1639                         if (reply) {
1640                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1641                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1642                                                 proc->pid, thread->pid, fp->handle);
1643                                         return_error = BR_FAILED_REPLY;
1644                                         goto err_fd_not_allowed;
1645                                 }
1646                         } else if (!target_node->accept_fds) {
1647                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1648                                         proc->pid, thread->pid, fp->handle);
1649                                 return_error = BR_FAILED_REPLY;
1650                                 goto err_fd_not_allowed;
1651                         }
1652
1653                         file = fget(fp->handle);
1654                         if (file == NULL) {
1655                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1656                                         proc->pid, thread->pid, fp->handle);
1657                                 return_error = BR_FAILED_REPLY;
1658                                 goto err_fget_failed;
1659                         }
1660                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1661                         if (target_fd < 0) {
1662                                 fput(file);
1663                                 return_error = BR_FAILED_REPLY;
1664                                 goto err_get_unused_fd_failed;
1665                         }
1666                         task_fd_install(target_proc, target_fd, file);
1667                         binder_debug(BINDER_DEBUG_TRANSACTION,
1668                                      "        fd %ld -> %d\n", fp->handle, target_fd);
1669                         /* TODO: fput? */
1670                         fp->handle = target_fd;
1671                 } break;
1672
1673                 default:
1674                         binder_user_error("binder: %d:%d got transactio"
1675                                 "n with invalid object type, %lx\n",
1676                                 proc->pid, thread->pid, fp->type);
1677                         return_error = BR_FAILED_REPLY;
1678                         goto err_bad_object_type;
1679                 }
1680         }
1681         if (reply) {
1682                 BUG_ON(t->buffer->async_transaction != 0);
1683                 binder_pop_transaction(target_thread, in_reply_to);
1684         } else if (!(t->flags & TF_ONE_WAY)) {
1685                 BUG_ON(t->buffer->async_transaction != 0);
1686                 t->need_reply = 1;
1687                 t->from_parent = thread->transaction_stack;
1688                 thread->transaction_stack = t;
1689         } else {
1690                 BUG_ON(target_node == NULL);
1691                 BUG_ON(t->buffer->async_transaction != 1);
1692                 if (target_node->has_async_transaction) {
1693                         target_list = &target_node->async_todo;
1694                         target_wait = NULL;
1695                 } else
1696                         target_node->has_async_transaction = 1;
1697         }
1698         t->work.type = BINDER_WORK_TRANSACTION;
1699         list_add_tail(&t->work.entry, target_list);
1700         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1701         list_add_tail(&tcomplete->entry, &thread->todo);
1702         if (target_wait)
1703                 wake_up_interruptible(target_wait);
1704         return;
1705
1706 err_get_unused_fd_failed:
1707 err_fget_failed:
1708 err_fd_not_allowed:
1709 err_binder_get_ref_for_node_failed:
1710 err_binder_get_ref_failed:
1711 err_binder_new_node_failed:
1712 err_bad_object_type:
1713 err_bad_offset:
1714 err_copy_data_failed:
1715         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1716         t->buffer->transaction = NULL;
1717         binder_free_buf(target_proc, t->buffer);
1718 err_binder_alloc_buf_failed:
1719         kfree(tcomplete);
1720         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
1721 err_alloc_tcomplete_failed:
1722         kfree(t);
1723         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
1724 err_alloc_t_failed:
1725 err_bad_call_stack:
1726 err_empty_call_stack:
1727 err_dead_binder:
1728 err_invalid_target_handle:
1729 err_no_context_mgr_node:
1730         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1731                      "binder: %d:%d transaction failed %d, size %zd-%zd\n",
1732                      proc->pid, thread->pid, return_error,
1733                      tr->data_size, tr->offsets_size);
1734
1735         {
1736                 struct binder_transaction_log_entry *fe;
1737                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1738                 *fe = *e;
1739         }
1740
1741         BUG_ON(thread->return_error != BR_OK);
1742         if (in_reply_to) {
1743                 thread->return_error = BR_TRANSACTION_COMPLETE;
1744                 binder_send_failed_reply(in_reply_to, return_error);
1745         } else
1746                 thread->return_error = return_error;
1747 }
1748
1749 int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1750                         void __user *buffer, int size, signed long *consumed)
1751 {
1752         uint32_t cmd;
1753         void __user *ptr = buffer + *consumed;
1754         void __user *end = buffer + size;
1755
1756         while (ptr < end && thread->return_error == BR_OK) {
1757                 if (get_user(cmd, (uint32_t __user *)ptr))
1758                         return -EFAULT;
1759                 ptr += sizeof(uint32_t);
1760                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1761                         binder_stats.bc[_IOC_NR(cmd)]++;
1762                         proc->stats.bc[_IOC_NR(cmd)]++;
1763                         thread->stats.bc[_IOC_NR(cmd)]++;
1764                 }
1765                 switch (cmd) {
1766                 case BC_INCREFS:
1767                 case BC_ACQUIRE:
1768                 case BC_RELEASE:
1769                 case BC_DECREFS: {
1770                         uint32_t target;
1771                         struct binder_ref *ref;
1772                         const char *debug_string;
1773
1774                         if (get_user(target, (uint32_t __user *)ptr))
1775                                 return -EFAULT;
1776                         ptr += sizeof(uint32_t);
1777                         if (target == 0 && binder_context_mgr_node &&
1778                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1779                                 ref = binder_get_ref_for_node(proc,
1780                                                binder_context_mgr_node);
1781                                 if (ref->desc != target) {
1782                                         binder_user_error("binder: %d:"
1783                                                 "%d tried to acquire "
1784                                                 "reference to desc 0, "
1785                                                 "got %d instead\n",
1786                                                 proc->pid, thread->pid,
1787                                                 ref->desc);
1788                                 }
1789                         } else
1790                                 ref = binder_get_ref(proc, target);
1791                         if (ref == NULL) {
1792                                 binder_user_error("binder: %d:%d refcou"
1793                                         "nt change on invalid ref %d\n",
1794                                         proc->pid, thread->pid, target);
1795                                 break;
1796                         }
1797                         switch (cmd) {
1798                         case BC_INCREFS:
1799                                 debug_string = "IncRefs";
1800                                 binder_inc_ref(ref, 0, NULL);
1801                                 break;
1802                         case BC_ACQUIRE:
1803                                 debug_string = "Acquire";
1804                                 binder_inc_ref(ref, 1, NULL);
1805                                 break;
1806                         case BC_RELEASE:
1807                                 debug_string = "Release";
1808                                 binder_dec_ref(ref, 1);
1809                                 break;
1810                         case BC_DECREFS:
1811                         default:
1812                                 debug_string = "DecRefs";
1813                                 binder_dec_ref(ref, 0);
1814                                 break;
1815                         }
1816                         binder_debug(BINDER_DEBUG_USER_REFS,
1817                                      "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1818                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1819                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1820                         break;
1821                 }
1822                 case BC_INCREFS_DONE:
1823                 case BC_ACQUIRE_DONE: {
1824                         void __user *node_ptr;
1825                         void *cookie;
1826                         struct binder_node *node;
1827
1828                         if (get_user(node_ptr, (void * __user *)ptr))
1829                                 return -EFAULT;
1830                         ptr += sizeof(void *);
1831                         if (get_user(cookie, (void * __user *)ptr))
1832                                 return -EFAULT;
1833                         ptr += sizeof(void *);
1834                         node = binder_get_node(proc, node_ptr);
1835                         if (node == NULL) {
1836                                 binder_user_error("binder: %d:%d "
1837                                         "%s u%p no match\n",
1838                                         proc->pid, thread->pid,
1839                                         cmd == BC_INCREFS_DONE ?
1840                                         "BC_INCREFS_DONE" :
1841                                         "BC_ACQUIRE_DONE",
1842                                         node_ptr);
1843                                 break;
1844                         }
1845                         if (cookie != node->cookie) {
1846                                 binder_user_error("binder: %d:%d %s u%p node %d"
1847                                         " cookie mismatch %p != %p\n",
1848                                         proc->pid, thread->pid,
1849                                         cmd == BC_INCREFS_DONE ?
1850                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1851                                         node_ptr, node->debug_id,
1852                                         cookie, node->cookie);
1853                                 break;
1854                         }
1855                         if (cmd == BC_ACQUIRE_DONE) {
1856                                 if (node->pending_strong_ref == 0) {
1857                                         binder_user_error("binder: %d:%d "
1858                                                 "BC_ACQUIRE_DONE node %d has "
1859                                                 "no pending acquire request\n",
1860                                                 proc->pid, thread->pid,
1861                                                 node->debug_id);
1862                                         break;
1863                                 }
1864                                 node->pending_strong_ref = 0;
1865                         } else {
1866                                 if (node->pending_weak_ref == 0) {
1867                                         binder_user_error("binder: %d:%d "
1868                                                 "BC_INCREFS_DONE node %d has "
1869                                                 "no pending increfs request\n",
1870                                                 proc->pid, thread->pid,
1871                                                 node->debug_id);
1872                                         break;
1873                                 }
1874                                 node->pending_weak_ref = 0;
1875                         }
1876                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1877                         binder_debug(BINDER_DEBUG_USER_REFS,
1878                                      "binder: %d:%d %s node %d ls %d lw %d\n",
1879                                      proc->pid, thread->pid,
1880                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1881                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1882                         break;
1883                 }
1884                 case BC_ATTEMPT_ACQUIRE:
1885                         printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported\n");
1886                         return -EINVAL;
1887                 case BC_ACQUIRE_RESULT:
1888                         printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported\n");
1889                         return -EINVAL;
1890
1891                 case BC_FREE_BUFFER: {
1892                         void __user *data_ptr;
1893                         struct binder_buffer *buffer;
1894
1895                         if (get_user(data_ptr, (void * __user *)ptr))
1896                                 return -EFAULT;
1897                         ptr += sizeof(void *);
1898
1899                         buffer = binder_buffer_lookup(proc, data_ptr);
1900                         if (buffer == NULL) {
1901                                 binder_user_error("binder: %d:%d "
1902                                         "BC_FREE_BUFFER u%p no match\n",
1903                                         proc->pid, thread->pid, data_ptr);
1904                                 break;
1905                         }
1906                         if (!buffer->allow_user_free) {
1907                                 binder_user_error("binder: %d:%d "
1908                                         "BC_FREE_BUFFER u%p matched "
1909                                         "unreturned buffer\n",
1910                                         proc->pid, thread->pid, data_ptr);
1911                                 break;
1912                         }
1913                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1914                                      "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1915                                      proc->pid, thread->pid, data_ptr, buffer->debug_id,
1916                                      buffer->transaction ? "active" : "finished");
1917
1918                         if (buffer->transaction) {
1919                                 buffer->transaction->buffer = NULL;
1920                                 buffer->transaction = NULL;
1921                         }
1922                         if (buffer->async_transaction && buffer->target_node) {
1923                                 BUG_ON(!buffer->target_node->has_async_transaction);
1924                                 if (list_empty(&buffer->target_node->async_todo))
1925                                         buffer->target_node->has_async_transaction = 0;
1926                                 else
1927                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1928                         }
1929                         binder_transaction_buffer_release(proc, buffer, NULL);
1930                         binder_free_buf(proc, buffer);
1931                         break;
1932                 }
1933
1934                 case BC_TRANSACTION:
1935                 case BC_REPLY: {
1936                         struct binder_transaction_data tr;
1937
1938                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1939                                 return -EFAULT;
1940                         ptr += sizeof(tr);
1941                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1942                         break;
1943                 }
1944
1945                 case BC_REGISTER_LOOPER:
1946                         binder_debug(BINDER_DEBUG_THREADS,
1947                                      "binder: %d:%d BC_REGISTER_LOOPER\n",
1948                                      proc->pid, thread->pid);
1949                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1950                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1951                                 binder_user_error("binder: %d:%d ERROR:"
1952                                         " BC_REGISTER_LOOPER called "
1953                                         "after BC_ENTER_LOOPER\n",
1954                                         proc->pid, thread->pid);
1955                         } else if (proc->requested_threads == 0) {
1956                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1957                                 binder_user_error("binder: %d:%d ERROR:"
1958                                         " BC_REGISTER_LOOPER called "
1959                                         "without request\n",
1960                                         proc->pid, thread->pid);
1961                         } else {
1962                                 proc->requested_threads--;
1963                                 proc->requested_threads_started++;
1964                         }
1965                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1966                         break;
1967                 case BC_ENTER_LOOPER:
1968                         binder_debug(BINDER_DEBUG_THREADS,
1969                                      "binder: %d:%d BC_ENTER_LOOPER\n",
1970                                      proc->pid, thread->pid);
1971                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1972                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1973                                 binder_user_error("binder: %d:%d ERROR:"
1974                                         " BC_ENTER_LOOPER called after "
1975                                         "BC_REGISTER_LOOPER\n",
1976                                         proc->pid, thread->pid);
1977                         }
1978                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1979                         break;
1980                 case BC_EXIT_LOOPER:
1981                         binder_debug(BINDER_DEBUG_THREADS,
1982                                      "binder: %d:%d BC_EXIT_LOOPER\n",
1983                                      proc->pid, thread->pid);
1984                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1985                         break;
1986
1987                 case BC_REQUEST_DEATH_NOTIFICATION:
1988                 case BC_CLEAR_DEATH_NOTIFICATION: {
1989                         uint32_t target;
1990                         void __user *cookie;
1991                         struct binder_ref *ref;
1992                         struct binder_ref_death *death;
1993
1994                         if (get_user(target, (uint32_t __user *)ptr))
1995                                 return -EFAULT;
1996                         ptr += sizeof(uint32_t);
1997                         if (get_user(cookie, (void __user * __user *)ptr))
1998                                 return -EFAULT;
1999                         ptr += sizeof(void *);
2000                         ref = binder_get_ref(proc, target);
2001                         if (ref == NULL) {
2002                                 binder_user_error("binder: %d:%d %s "
2003                                         "invalid ref %d\n",
2004                                         proc->pid, thread->pid,
2005                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2006                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2007                                         "BC_CLEAR_DEATH_NOTIFICATION",
2008                                         target);
2009                                 break;
2010                         }
2011
2012                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2013                                      "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
2014                                      proc->pid, thread->pid,
2015                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2016                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2017                                      "BC_CLEAR_DEATH_NOTIFICATION",
2018                                      cookie, ref->debug_id, ref->desc,
2019                                      ref->strong, ref->weak, ref->node->debug_id);
2020
2021                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2022                                 if (ref->death) {
2023                                         binder_user_error("binder: %d:%"
2024                                                 "d BC_REQUEST_DEATH_NOTI"
2025                                                 "FICATION death notific"
2026                                                 "ation already set\n",
2027                                                 proc->pid, thread->pid);
2028                                         break;
2029                                 }
2030                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2031                                 if (death == NULL) {
2032                                         thread->return_error = BR_ERROR;
2033                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2034                                                      "binder: %d:%d "
2035                                                      "BC_REQUEST_DEATH_NOTIFICATION failed\n",
2036                                                      proc->pid, thread->pid);
2037                                         break;
2038                                 }
2039                                 binder_stats.obj_created[BINDER_STAT_DEATH]++;
2040                                 INIT_LIST_HEAD(&death->work.entry);
2041                                 death->cookie = cookie;
2042                                 ref->death = death;
2043                                 if (ref->node->proc == NULL) {
2044                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2045                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2046                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2047                                         } else {
2048                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2049                                                 wake_up_interruptible(&proc->wait);
2050                                         }
2051                                 }
2052                         } else {
2053                                 if (ref->death == NULL) {
2054                                         binder_user_error("binder: %d:%"
2055                                                 "d BC_CLEAR_DEATH_NOTIFI"
2056                                                 "CATION death notificat"
2057                                                 "ion not active\n",
2058                                                 proc->pid, thread->pid);
2059                                         break;
2060                                 }
2061                                 death = ref->death;
2062                                 if (death->cookie != cookie) {
2063                                         binder_user_error("binder: %d:%"
2064                                                 "d BC_CLEAR_DEATH_NOTIFI"
2065                                                 "CATION death notificat"
2066                                                 "ion cookie mismatch "
2067                                                 "%p != %p\n",
2068                                                 proc->pid, thread->pid,
2069                                                 death->cookie, cookie);
2070                                         break;
2071                                 }
2072                                 ref->death = NULL;
2073                                 if (list_empty(&death->work.entry)) {
2074                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2075                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2076                                                 list_add_tail(&death->work.entry, &thread->todo);
2077                                         } else {
2078                                                 list_add_tail(&death->work.entry, &proc->todo);
2079                                                 wake_up_interruptible(&proc->wait);
2080                                         }
2081                                 } else {
2082                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2083                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2084                                 }
2085                         }
2086                 } break;
2087                 case BC_DEAD_BINDER_DONE: {
2088                         struct binder_work *w;
2089                         void __user *cookie;
2090                         struct binder_ref_death *death = NULL;
2091                         if (get_user(cookie, (void __user * __user *)ptr))
2092                                 return -EFAULT;
2093
2094                         ptr += sizeof(void *);
2095                         list_for_each_entry(w, &proc->delivered_death, entry) {
2096                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2097                                 if (tmp_death->cookie == cookie) {
2098                                         death = tmp_death;
2099                                         break;
2100                                 }
2101                         }
2102                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2103                                      "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2104                                      proc->pid, thread->pid, cookie, death);
2105                         if (death == NULL) {
2106                                 binder_user_error("binder: %d:%d BC_DEAD"
2107                                         "_BINDER_DONE %p not found\n",
2108                                         proc->pid, thread->pid, cookie);
2109                                 break;
2110                         }
2111
2112                         list_del_init(&death->work.entry);
2113                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2114                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2115                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2116                                         list_add_tail(&death->work.entry, &thread->todo);
2117                                 } else {
2118                                         list_add_tail(&death->work.entry, &proc->todo);
2119                                         wake_up_interruptible(&proc->wait);
2120                                 }
2121                         }
2122                 } break;
2123
2124                 default:
2125                         printk(KERN_ERR "binder: %d:%d unknown command %d\n",
2126                                proc->pid, thread->pid, cmd);
2127                         return -EINVAL;
2128                 }
2129                 *consumed = ptr - buffer;
2130         }
2131         return 0;
2132 }
2133
2134 void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2135                     uint32_t cmd)
2136 {
2137         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2138                 binder_stats.br[_IOC_NR(cmd)]++;
2139                 proc->stats.br[_IOC_NR(cmd)]++;
2140                 thread->stats.br[_IOC_NR(cmd)]++;
2141         }
2142 }
2143
2144 static int binder_has_proc_work(struct binder_proc *proc,
2145                                 struct binder_thread *thread)
2146 {
2147         return !list_empty(&proc->todo) ||
2148                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2149 }
2150
2151 static int binder_has_thread_work(struct binder_thread *thread)
2152 {
2153         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2154                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2155 }
2156
2157 static int binder_thread_read(struct binder_proc *proc,
2158                               struct binder_thread *thread,
2159                               void  __user *buffer, int size,
2160                               signed long *consumed, int non_block)
2161 {
2162         void __user *ptr = buffer + *consumed;
2163         void __user *end = buffer + size;
2164
2165         int ret = 0;
2166         int wait_for_proc_work;
2167
2168         if (*consumed == 0) {
2169                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2170                         return -EFAULT;
2171                 ptr += sizeof(uint32_t);
2172         }
2173
2174 retry:
2175         wait_for_proc_work = thread->transaction_stack == NULL &&
2176                                 list_empty(&thread->todo);
2177
2178         if (thread->return_error != BR_OK && ptr < end) {
2179                 if (thread->return_error2 != BR_OK) {
2180                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2181                                 return -EFAULT;
2182                         ptr += sizeof(uint32_t);
2183                         if (ptr == end)
2184                                 goto done;
2185                         thread->return_error2 = BR_OK;
2186                 }
2187                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2188                         return -EFAULT;
2189                 ptr += sizeof(uint32_t);
2190                 thread->return_error = BR_OK;
2191                 goto done;
2192         }
2193
2194
2195         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2196         if (wait_for_proc_work)
2197                 proc->ready_threads++;
2198         mutex_unlock(&binder_lock);
2199         if (wait_for_proc_work) {
2200                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2201                                         BINDER_LOOPER_STATE_ENTERED))) {
2202                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
2203                                 "for process work before calling BC_REGISTER_"
2204                                 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2205                                 proc->pid, thread->pid, thread->looper);
2206                         wait_event_interruptible(binder_user_error_wait,
2207                                                  binder_stop_on_user_error < 2);
2208                 }
2209                 binder_set_nice(proc->default_priority);
2210                 if (non_block) {
2211                         if (!binder_has_proc_work(proc, thread))
2212                                 ret = -EAGAIN;
2213                 } else
2214                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2215         } else {
2216                 if (non_block) {
2217                         if (!binder_has_thread_work(thread))
2218                                 ret = -EAGAIN;
2219                 } else
2220                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2221         }
2222         mutex_lock(&binder_lock);
2223         if (wait_for_proc_work)
2224                 proc->ready_threads--;
2225         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2226
2227         if (ret)
2228                 return ret;
2229
2230         while (1) {
2231                 uint32_t cmd;
2232                 struct binder_transaction_data tr;
2233                 struct binder_work *w;
2234                 struct binder_transaction *t = NULL;
2235
2236                 if (!list_empty(&thread->todo))
2237                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2238                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2239                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2240                 else {
2241                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2242                                 goto retry;
2243                         break;
2244                 }
2245
2246                 if (end - ptr < sizeof(tr) + 4)
2247                         break;
2248
2249                 switch (w->type) {
2250                 case BINDER_WORK_TRANSACTION: {
2251                         t = container_of(w, struct binder_transaction, work);
2252                 } break;
2253                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2254                         cmd = BR_TRANSACTION_COMPLETE;
2255                         if (put_user(cmd, (uint32_t __user *)ptr))
2256                                 return -EFAULT;
2257                         ptr += sizeof(uint32_t);
2258
2259                         binder_stat_br(proc, thread, cmd);
2260                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2261                                      "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2262                                      proc->pid, thread->pid);
2263
2264                         list_del(&w->entry);
2265                         kfree(w);
2266                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2267                 } break;
2268                 case BINDER_WORK_NODE: {
2269                         struct binder_node *node = container_of(w, struct binder_node, work);
2270                         uint32_t cmd = BR_NOOP;
2271                         const char *cmd_name;
2272                         int strong = node->internal_strong_refs || node->local_strong_refs;
2273                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2274                         if (weak && !node->has_weak_ref) {
2275                                 cmd = BR_INCREFS;
2276                                 cmd_name = "BR_INCREFS";
2277                                 node->has_weak_ref = 1;
2278                                 node->pending_weak_ref = 1;
2279                                 node->local_weak_refs++;
2280                         } else if (strong && !node->has_strong_ref) {
2281                                 cmd = BR_ACQUIRE;
2282                                 cmd_name = "BR_ACQUIRE";
2283                                 node->has_strong_ref = 1;
2284                                 node->pending_strong_ref = 1;
2285                                 node->local_strong_refs++;
2286                         } else if (!strong && node->has_strong_ref) {
2287                                 cmd = BR_RELEASE;
2288                                 cmd_name = "BR_RELEASE";
2289                                 node->has_strong_ref = 0;
2290                         } else if (!weak && node->has_weak_ref) {
2291                                 cmd = BR_DECREFS;
2292                                 cmd_name = "BR_DECREFS";
2293                                 node->has_weak_ref = 0;
2294                         }
2295                         if (cmd != BR_NOOP) {
2296                                 if (put_user(cmd, (uint32_t __user *)ptr))
2297                                         return -EFAULT;
2298                                 ptr += sizeof(uint32_t);
2299                                 if (put_user(node->ptr, (void * __user *)ptr))
2300                                         return -EFAULT;
2301                                 ptr += sizeof(void *);
2302                                 if (put_user(node->cookie, (void * __user *)ptr))
2303                                         return -EFAULT;
2304                                 ptr += sizeof(void *);
2305
2306                                 binder_stat_br(proc, thread, cmd);
2307                                 binder_debug(BINDER_DEBUG_USER_REFS,
2308                                              "binder: %d:%d %s %d u%p c%p\n",
2309                                              proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2310                         } else {
2311                                 list_del_init(&w->entry);
2312                                 if (!weak && !strong) {
2313                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2314                                                      "binder: %d:%d node %d u%p c%p deleted\n",
2315                                                      proc->pid, thread->pid, node->debug_id,
2316                                                      node->ptr, node->cookie);
2317                                         rb_erase(&node->rb_node, &proc->nodes);
2318                                         kfree(node);
2319                                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2320                                 } else {
2321                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2322                                                      "binder: %d:%d node %d u%p c%p state unchanged\n",
2323                                                      proc->pid, thread->pid, node->debug_id, node->ptr,
2324                                                      node->cookie);
2325                                 }
2326                         }
2327                 } break;
2328                 case BINDER_WORK_DEAD_BINDER:
2329                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2330                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2331                         struct binder_ref_death *death;
2332                         uint32_t cmd;
2333
2334                         death = container_of(w, struct binder_ref_death, work);
2335                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2336                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2337                         else
2338                                 cmd = BR_DEAD_BINDER;
2339                         if (put_user(cmd, (uint32_t __user *)ptr))
2340                                 return -EFAULT;
2341                         ptr += sizeof(uint32_t);
2342                         if (put_user(death->cookie, (void * __user *)ptr))
2343                                 return -EFAULT;
2344                         ptr += sizeof(void *);
2345                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2346                                      "binder: %d:%d %s %p\n",
2347                                       proc->pid, thread->pid,
2348                                       cmd == BR_DEAD_BINDER ?
2349                                       "BR_DEAD_BINDER" :
2350                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2351                                       death->cookie);
2352
2353                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2354                                 list_del(&w->entry);
2355                                 kfree(death);
2356                                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
2357                         } else
2358                                 list_move(&w->entry, &proc->delivered_death);
2359                         if (cmd == BR_DEAD_BINDER)
2360                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2361                 } break;
2362                 }
2363
2364                 if (!t)
2365                         continue;
2366
2367                 BUG_ON(t->buffer == NULL);
2368                 if (t->buffer->target_node) {
2369                         struct binder_node *target_node = t->buffer->target_node;
2370                         tr.target.ptr = target_node->ptr;
2371                         tr.cookie =  target_node->cookie;
2372                         t->saved_priority = task_nice(current);
2373                         if (t->priority < target_node->min_priority &&
2374                             !(t->flags & TF_ONE_WAY))
2375                                 binder_set_nice(t->priority);
2376                         else if (!(t->flags & TF_ONE_WAY) ||
2377                                  t->saved_priority > target_node->min_priority)
2378                                 binder_set_nice(target_node->min_priority);
2379                         cmd = BR_TRANSACTION;
2380                 } else {
2381                         tr.target.ptr = NULL;
2382                         tr.cookie = NULL;
2383                         cmd = BR_REPLY;
2384                 }
2385                 tr.code = t->code;
2386                 tr.flags = t->flags;
2387                 tr.sender_euid = t->sender_euid;
2388
2389                 if (t->from) {
2390                         struct task_struct *sender = t->from->proc->tsk;
2391                         tr.sender_pid = task_tgid_nr_ns(sender,
2392                                                         current->nsproxy->pid_ns);
2393                 } else {
2394                         tr.sender_pid = 0;
2395                 }
2396
2397                 tr.data_size = t->buffer->data_size;
2398                 tr.offsets_size = t->buffer->offsets_size;
2399                 tr.data.ptr.buffer = (void *)t->buffer->data +
2400                                         proc->user_buffer_offset;
2401                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2402                                         ALIGN(t->buffer->data_size,
2403                                             sizeof(void *));
2404
2405                 if (put_user(cmd, (uint32_t __user *)ptr))
2406                         return -EFAULT;
2407                 ptr += sizeof(uint32_t);
2408                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2409                         return -EFAULT;
2410                 ptr += sizeof(tr);
2411
2412                 binder_stat_br(proc, thread, cmd);
2413                 binder_debug(BINDER_DEBUG_TRANSACTION,
2414                              "binder: %d:%d %s %d %d:%d, cmd %d"
2415                              "size %zd-%zd ptr %p-%p\n",
2416                              proc->pid, thread->pid,
2417                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2418                              "BR_REPLY",
2419                              t->debug_id, t->from ? t->from->proc->pid : 0,
2420                              t->from ? t->from->pid : 0, cmd,
2421                              t->buffer->data_size, t->buffer->offsets_size,
2422                              tr.data.ptr.buffer, tr.data.ptr.offsets);
2423
2424                 list_del(&t->work.entry);
2425                 t->buffer->allow_user_free = 1;
2426                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2427                         t->to_parent = thread->transaction_stack;
2428                         t->to_thread = thread;
2429                         thread->transaction_stack = t;
2430                 } else {
2431                         t->buffer->transaction = NULL;
2432                         kfree(t);
2433                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
2434                 }
2435                 break;
2436         }
2437
2438 done:
2439
2440         *consumed = ptr - buffer;
2441         if (proc->requested_threads + proc->ready_threads == 0 &&
2442             proc->requested_threads_started < proc->max_threads &&
2443             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2444              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2445              /*spawn a new thread if we leave this out */) {
2446                 proc->requested_threads++;
2447                 binder_debug(BINDER_DEBUG_THREADS,
2448                              "binder: %d:%d BR_SPAWN_LOOPER\n",
2449                              proc->pid, thread->pid);
2450                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2451                         return -EFAULT;
2452         }
2453         return 0;
2454 }
2455
2456 static void binder_release_work(struct list_head *list)
2457 {
2458         struct binder_work *w;
2459         while (!list_empty(list)) {
2460                 w = list_first_entry(list, struct binder_work, entry);
2461                 list_del_init(&w->entry);
2462                 switch (w->type) {
2463                 case BINDER_WORK_TRANSACTION: {
2464                         struct binder_transaction *t;
2465
2466                         t = container_of(w, struct binder_transaction, work);
2467                         if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
2468                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2469                 } break;
2470                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2471                         kfree(w);
2472                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
2473                 } break;
2474                 default:
2475                         break;
2476                 }
2477         }
2478
2479 }
2480
2481 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2482 {
2483         struct binder_thread *thread = NULL;
2484         struct rb_node *parent = NULL;
2485         struct rb_node **p = &proc->threads.rb_node;
2486
2487         while (*p) {
2488                 parent = *p;
2489                 thread = rb_entry(parent, struct binder_thread, rb_node);
2490
2491                 if (current->pid < thread->pid)
2492                         p = &(*p)->rb_left;
2493                 else if (current->pid > thread->pid)
2494                         p = &(*p)->rb_right;
2495                 else
2496                         break;
2497         }
2498         if (*p == NULL) {
2499                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2500                 if (thread == NULL)
2501                         return NULL;
2502                 binder_stats.obj_created[BINDER_STAT_THREAD]++;
2503                 thread->proc = proc;
2504                 thread->pid = current->pid;
2505                 init_waitqueue_head(&thread->wait);
2506                 INIT_LIST_HEAD(&thread->todo);
2507                 rb_link_node(&thread->rb_node, parent, p);
2508                 rb_insert_color(&thread->rb_node, &proc->threads);
2509                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2510                 thread->return_error = BR_OK;
2511                 thread->return_error2 = BR_OK;
2512         }
2513         return thread;
2514 }
2515
2516 static int binder_free_thread(struct binder_proc *proc,
2517                               struct binder_thread *thread)
2518 {
2519         struct binder_transaction *t;
2520         struct binder_transaction *send_reply = NULL;
2521         int active_transactions = 0;
2522
2523         rb_erase(&thread->rb_node, &proc->threads);
2524         t = thread->transaction_stack;
2525         if (t && t->to_thread == thread)
2526                 send_reply = t;
2527         while (t) {
2528                 active_transactions++;
2529                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2530                              "binder: release %d:%d transaction %d "
2531                              "%s, still active\n", proc->pid, thread->pid,
2532                              t->debug_id,
2533                              (t->to_thread == thread) ? "in" : "out");
2534
2535                 if (t->to_thread == thread) {
2536                         t->to_proc = NULL;
2537                         t->to_thread = NULL;
2538                         if (t->buffer) {
2539                                 t->buffer->transaction = NULL;
2540                                 t->buffer = NULL;
2541                         }
2542                         t = t->to_parent;
2543                 } else if (t->from == thread) {
2544                         t->from = NULL;
2545                         t = t->from_parent;
2546                 } else
2547                         BUG();
2548         }
2549         if (send_reply)
2550                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2551         binder_release_work(&thread->todo);
2552         kfree(thread);
2553         binder_stats.obj_deleted[BINDER_STAT_THREAD]++;
2554         return active_transactions;
2555 }
2556
2557 static unsigned int binder_poll(struct file *filp,
2558                                 struct poll_table_struct *wait)
2559 {
2560         struct binder_proc *proc = filp->private_data;
2561         struct binder_thread *thread = NULL;
2562         int wait_for_proc_work;
2563
2564         mutex_lock(&binder_lock);
2565         thread = binder_get_thread(proc);
2566
2567         wait_for_proc_work = thread->transaction_stack == NULL &&
2568                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2569         mutex_unlock(&binder_lock);
2570
2571         if (wait_for_proc_work) {
2572                 if (binder_has_proc_work(proc, thread))
2573                         return POLLIN;
2574                 poll_wait(filp, &proc->wait, wait);
2575                 if (binder_has_proc_work(proc, thread))
2576                         return POLLIN;
2577         } else {
2578                 if (binder_has_thread_work(thread))
2579                         return POLLIN;
2580                 poll_wait(filp, &thread->wait, wait);
2581                 if (binder_has_thread_work(thread))
2582                         return POLLIN;
2583         }
2584         return 0;
2585 }
2586
2587 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2588 {
2589         int ret;
2590         struct binder_proc *proc = filp->private_data;
2591         struct binder_thread *thread;
2592         unsigned int size = _IOC_SIZE(cmd);
2593         void __user *ubuf = (void __user *)arg;
2594
2595         /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2596
2597         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2598         if (ret)
2599                 return ret;
2600
2601         mutex_lock(&binder_lock);
2602         thread = binder_get_thread(proc);
2603         if (thread == NULL) {
2604                 ret = -ENOMEM;
2605                 goto err;
2606         }
2607
2608         switch (cmd) {
2609         case BINDER_WRITE_READ: {
2610                 struct binder_write_read bwr;
2611                 if (size != sizeof(struct binder_write_read)) {
2612                         ret = -EINVAL;
2613                         goto err;
2614                 }
2615                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2616                         ret = -EFAULT;
2617                         goto err;
2618                 }
2619                 binder_debug(BINDER_DEBUG_READ_WRITE,
2620                              "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2621                              proc->pid, thread->pid, bwr.write_size, bwr.write_buffer,
2622                              bwr.read_size, bwr.read_buffer);
2623
2624                 if (bwr.write_size > 0) {
2625                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2626                         if (ret < 0) {
2627                                 bwr.read_consumed = 0;
2628                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2629                                         ret = -EFAULT;
2630                                 goto err;
2631                         }
2632                 }
2633                 if (bwr.read_size > 0) {
2634                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2635                         if (!list_empty(&proc->todo))
2636                                 wake_up_interruptible(&proc->wait);
2637                         if (ret < 0) {
2638                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2639                                         ret = -EFAULT;
2640                                 goto err;
2641                         }
2642                 }
2643                 binder_debug(BINDER_DEBUG_READ_WRITE,
2644                              "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2645                              proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2646                              bwr.read_consumed, bwr.read_size);
2647                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2648                         ret = -EFAULT;
2649                         goto err;
2650                 }
2651                 break;
2652         }
2653         case BINDER_SET_MAX_THREADS:
2654                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2655                         ret = -EINVAL;
2656                         goto err;
2657                 }
2658                 break;
2659         case BINDER_SET_CONTEXT_MGR:
2660                 if (binder_context_mgr_node != NULL) {
2661                         printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set\n");
2662                         ret = -EBUSY;
2663                         goto err;
2664                 }
2665                 if (binder_context_mgr_uid != -1) {
2666                         if (binder_context_mgr_uid != current->cred->euid) {
2667                                 printk(KERN_ERR "binder: BINDER_SET_"
2668                                        "CONTEXT_MGR bad uid %d != %d\n",
2669                                        current->cred->euid,
2670                                        binder_context_mgr_uid);
2671                                 ret = -EPERM;
2672                                 goto err;
2673                         }
2674                 } else
2675                         binder_context_mgr_uid = current->cred->euid;
2676                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2677                 if (binder_context_mgr_node == NULL) {
2678                         ret = -ENOMEM;
2679                         goto err;
2680                 }
2681                 binder_context_mgr_node->local_weak_refs++;
2682                 binder_context_mgr_node->local_strong_refs++;
2683                 binder_context_mgr_node->has_strong_ref = 1;
2684                 binder_context_mgr_node->has_weak_ref = 1;
2685                 break;
2686         case BINDER_THREAD_EXIT:
2687                 binder_debug(BINDER_DEBUG_THREADS, "binder: %d:%d exit\n",
2688                              proc->pid, thread->pid);
2689                 binder_free_thread(proc, thread);
2690                 thread = NULL;
2691                 break;
2692         case BINDER_VERSION:
2693                 if (size != sizeof(struct binder_version)) {
2694                         ret = -EINVAL;
2695                         goto err;
2696                 }
2697                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2698                         ret = -EINVAL;
2699                         goto err;
2700                 }
2701                 break;
2702         default:
2703                 ret = -EINVAL;
2704                 goto err;
2705         }
2706         ret = 0;
2707 err:
2708         if (thread)
2709                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2710         mutex_unlock(&binder_lock);
2711         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2712         if (ret && ret != -ERESTARTSYS)
2713                 printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2714         return ret;
2715 }
2716
2717 static void binder_vma_open(struct vm_area_struct *vma)
2718 {
2719         struct binder_proc *proc = vma->vm_private_data;
2720         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2721                      "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2722                      proc->pid, vma->vm_start, vma->vm_end,
2723                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2724                      (unsigned long)pgprot_val(vma->vm_page_prot));
2725         dump_stack();
2726 }
2727
2728 static void binder_vma_close(struct vm_area_struct *vma)
2729 {
2730         struct binder_proc *proc = vma->vm_private_data;
2731         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2732                      "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2733                      proc->pid, vma->vm_start, vma->vm_end,
2734                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2735                      (unsigned long)pgprot_val(vma->vm_page_prot));
2736         proc->vma = NULL;
2737         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2738 }
2739
2740 static struct vm_operations_struct binder_vm_ops = {
2741         .open = binder_vma_open,
2742         .close = binder_vma_close,
2743 };
2744
2745 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2746 {
2747         int ret;
2748         struct vm_struct *area;
2749         struct binder_proc *proc = filp->private_data;
2750         const char *failure_string;
2751         struct binder_buffer *buffer;
2752
2753         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2754                 vma->vm_end = vma->vm_start + SZ_4M;
2755
2756         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2757                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2758                      proc->pid, vma->vm_start, vma->vm_end,
2759                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2760                      (unsigned long)pgprot_val(vma->vm_page_prot));
2761
2762         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2763                 ret = -EPERM;
2764                 failure_string = "bad vm_flags";
2765                 goto err_bad_arg;
2766         }
2767         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2768
2769         if (proc->buffer) {
2770                 ret = -EBUSY;
2771                 failure_string = "already mapped";
2772                 goto err_already_mapped;
2773         }
2774
2775         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2776         if (area == NULL) {
2777                 ret = -ENOMEM;
2778                 failure_string = "get_vm_area";
2779                 goto err_get_vm_area_failed;
2780         }
2781         proc->buffer = area->addr;
2782         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2783
2784 #ifdef CONFIG_CPU_CACHE_VIPT
2785         if (cache_is_vipt_aliasing()) {
2786                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2787                         printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2788                         vma->vm_start += PAGE_SIZE;
2789                 }
2790         }
2791 #endif
2792         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2793         if (proc->pages == NULL) {
2794                 ret = -ENOMEM;
2795                 failure_string = "alloc page array";
2796                 goto err_alloc_pages_failed;
2797         }
2798         proc->buffer_size = vma->vm_end - vma->vm_start;
2799
2800         vma->vm_ops = &binder_vm_ops;
2801         vma->vm_private_data = proc;
2802
2803         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2804                 ret = -ENOMEM;
2805                 failure_string = "alloc small buf";
2806                 goto err_alloc_small_buf_failed;
2807         }
2808         buffer = proc->buffer;
2809         INIT_LIST_HEAD(&proc->buffers);
2810         list_add(&buffer->entry, &proc->buffers);
2811         buffer->free = 1;
2812         binder_insert_free_buffer(proc, buffer);
2813         proc->free_async_space = proc->buffer_size / 2;
2814         barrier();
2815         proc->files = get_files_struct(current);
2816         proc->vma = vma;
2817
2818         /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n",
2819                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2820         return 0;
2821
2822 err_alloc_small_buf_failed:
2823         kfree(proc->pages);
2824         proc->pages = NULL;
2825 err_alloc_pages_failed:
2826         vfree(proc->buffer);
2827         proc->buffer = NULL;
2828 err_get_vm_area_failed:
2829 err_already_mapped:
2830 err_bad_arg:
2831         printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n",
2832                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2833         return ret;
2834 }
2835
2836 static int binder_open(struct inode *nodp, struct file *filp)
2837 {
2838         struct binder_proc *proc;
2839
2840         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2841                      current->group_leader->pid, current->pid);
2842
2843         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2844         if (proc == NULL)
2845                 return -ENOMEM;
2846         get_task_struct(current);
2847         proc->tsk = current;
2848         INIT_LIST_HEAD(&proc->todo);
2849         init_waitqueue_head(&proc->wait);
2850         proc->default_priority = task_nice(current);
2851         mutex_lock(&binder_lock);
2852         binder_stats.obj_created[BINDER_STAT_PROC]++;
2853         hlist_add_head(&proc->proc_node, &binder_procs);
2854         proc->pid = current->group_leader->pid;
2855         INIT_LIST_HEAD(&proc->delivered_death);
2856         filp->private_data = proc;
2857         mutex_unlock(&binder_lock);
2858
2859         if (binder_proc_dir_entry_proc) {
2860                 char strbuf[11];
2861                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2862                 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2863                 create_proc_read_entry(strbuf, S_IRUGO,
2864                                        binder_proc_dir_entry_proc,
2865                                        binder_read_proc_proc, proc);
2866         }
2867
2868         return 0;
2869 }
2870
2871 static int binder_flush(struct file *filp, fl_owner_t id)
2872 {
2873         struct binder_proc *proc = filp->private_data;
2874
2875         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2876
2877         return 0;
2878 }
2879
2880 static void binder_deferred_flush(struct binder_proc *proc)
2881 {
2882         struct rb_node *n;
2883         int wake_count = 0;
2884         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2885                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2886                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2887                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2888                         wake_up_interruptible(&thread->wait);
2889                         wake_count++;
2890                 }
2891         }
2892         wake_up_interruptible_all(&proc->wait);
2893
2894         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2895                      "binder_flush: %d woke %d threads\n", proc->pid,
2896                      wake_count);
2897 }
2898
2899 static int binder_release(struct inode *nodp, struct file *filp)
2900 {
2901         struct binder_proc *proc = filp->private_data;
2902         if (binder_proc_dir_entry_proc) {
2903                 char strbuf[11];
2904                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2905                 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2906         }
2907
2908         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2909
2910         return 0;
2911 }
2912
2913 static void binder_deferred_release(struct binder_proc *proc)
2914 {
2915         struct hlist_node *pos;
2916         struct binder_transaction *t;
2917         struct rb_node *n;
2918         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2919
2920         BUG_ON(proc->vma);
2921         BUG_ON(proc->files);
2922
2923         hlist_del(&proc->proc_node);
2924         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2925                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2926                              "binder_release: %d context_mgr_node gone\n",
2927                              proc->pid);
2928                 binder_context_mgr_node = NULL;
2929         }
2930
2931         threads = 0;
2932         active_transactions = 0;
2933         while ((n = rb_first(&proc->threads))) {
2934                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2935                 threads++;
2936                 active_transactions += binder_free_thread(proc, thread);
2937         }
2938         nodes = 0;
2939         incoming_refs = 0;
2940         while ((n = rb_first(&proc->nodes))) {
2941                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2942
2943                 nodes++;
2944                 rb_erase(&node->rb_node, &proc->nodes);
2945                 list_del_init(&node->work.entry);
2946                 if (hlist_empty(&node->refs)) {
2947                         kfree(node);
2948                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
2949                 } else {
2950                         struct binder_ref *ref;
2951                         int death = 0;
2952
2953                         node->proc = NULL;
2954                         node->local_strong_refs = 0;
2955                         node->local_weak_refs = 0;
2956                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2957
2958                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2959                                 incoming_refs++;
2960                                 if (ref->death) {
2961                                         death++;
2962                                         if (list_empty(&ref->death->work.entry)) {
2963                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2964                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2965                                                 wake_up_interruptible(&ref->proc->wait);
2966                                         } else
2967                                                 BUG();
2968                                 }
2969                         }
2970                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2971                                      "binder: node %d now dead, "
2972                                      "refs %d, death %d\n", node->debug_id,
2973                                      incoming_refs, death);
2974                 }
2975         }
2976         outgoing_refs = 0;
2977         while ((n = rb_first(&proc->refs_by_desc))) {
2978                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
2979                                                   rb_node_desc);
2980                 outgoing_refs++;
2981                 binder_delete_ref(ref);
2982         }
2983         binder_release_work(&proc->todo);
2984         buffers = 0;
2985
2986         while ((n = rb_first(&proc->allocated_buffers))) {
2987                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
2988                                                         rb_node);
2989                 t = buffer->transaction;
2990                 if (t) {
2991                         t->buffer = NULL;
2992                         buffer->transaction = NULL;
2993                         printk(KERN_ERR "binder: release proc %d, "
2994                                "transaction %d, not freed\n",
2995                                proc->pid, t->debug_id);
2996                         /*BUG();*/
2997                 }
2998                 binder_free_buf(proc, buffer);
2999                 buffers++;
3000         }
3001
3002         binder_stats.obj_deleted[BINDER_STAT_PROC]++;
3003
3004         page_count = 0;
3005         if (proc->pages) {
3006                 int i;
3007                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3008                         if (proc->pages[i]) {
3009                                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3010                                              "binder_release: %d: "
3011                                              "page %d at %p not freed\n",
3012                                              proc->pid, i,
3013                                              proc->buffer + i * PAGE_SIZE);
3014                                 __free_page(proc->pages[i]);
3015                                 page_count++;
3016                         }
3017                 }
3018                 kfree(proc->pages);
3019                 vfree(proc->buffer);
3020         }
3021
3022         put_task_struct(proc->tsk);
3023
3024         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3025                      "binder_release: %d threads %d, nodes %d (ref %d), "
3026                      "refs %d, active transactions %d, buffers %d, "
3027                      "pages %d\n",
3028                      proc->pid, threads, nodes, incoming_refs, outgoing_refs,
3029                      active_transactions, buffers, page_count);
3030
3031         kfree(proc);
3032 }
3033
3034 static void binder_deferred_func(struct work_struct *work)
3035 {
3036         struct binder_proc *proc;
3037         struct files_struct *files;
3038
3039         int defer;
3040         do {
3041                 mutex_lock(&binder_lock);
3042                 mutex_lock(&binder_deferred_lock);
3043                 if (!hlist_empty(&binder_deferred_list)) {
3044                         proc = hlist_entry(binder_deferred_list.first,
3045                                         struct binder_proc, deferred_work_node);
3046                         hlist_del_init(&proc->deferred_work_node);
3047                         defer = proc->deferred_work;
3048                         proc->deferred_work = 0;
3049                 } else {
3050                         proc = NULL;
3051                         defer = 0;
3052                 }
3053                 mutex_unlock(&binder_deferred_lock);
3054
3055                 files = NULL;
3056                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3057                         files = proc->files;
3058                         if (files)
3059                                 proc->files = NULL;
3060                 }
3061
3062                 if (defer & BINDER_DEFERRED_FLUSH)
3063                         binder_deferred_flush(proc);
3064
3065                 if (defer & BINDER_DEFERRED_RELEASE)
3066                         binder_deferred_release(proc); /* frees proc */
3067
3068                 mutex_unlock(&binder_lock);
3069                 if (files)
3070                         put_files_struct(files);
3071         } while (proc);
3072 }
3073 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3074
3075 static void
3076 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3077 {
3078         mutex_lock(&binder_deferred_lock);
3079         proc->deferred_work |= defer;
3080         if (hlist_unhashed(&proc->deferred_work_node)) {
3081                 hlist_add_head(&proc->deferred_work_node,
3082                                 &binder_deferred_list);
3083                 schedule_work(&binder_deferred_work);
3084         }
3085         mutex_unlock(&binder_deferred_lock);
3086 }
3087
3088 static char *print_binder_transaction(char *buf, char *end, const char *prefix,
3089                                       struct binder_transaction *t)
3090 {
3091         buf += snprintf(buf, end - buf,
3092                         "%s %d: %p from %d:%d to %d:%d code %x "
3093                         "flags %x pri %ld r%d",
3094                         prefix, t->debug_id, t,
3095                         t->from ? t->from->proc->pid : 0,
3096                         t->from ? t->from->pid : 0,
3097                         t->to_proc ? t->to_proc->pid : 0,
3098                         t->to_thread ? t->to_thread->pid : 0,
3099                         t->code, t->flags, t->priority, t->need_reply);
3100         if (buf >= end)
3101                 return buf;
3102         if (t->buffer == NULL) {
3103                 buf += snprintf(buf, end - buf, " buffer free\n");
3104                 return buf;
3105         }
3106         if (t->buffer->target_node) {
3107                 buf += snprintf(buf, end - buf, " node %d",
3108                                 t->buffer->target_node->debug_id);
3109                 if (buf >= end)
3110                         return buf;
3111         }
3112         buf += snprintf(buf, end - buf, " size %zd:%zd data %p\n",
3113                         t->buffer->data_size, t->buffer->offsets_size,
3114                         t->buffer->data);
3115         return buf;
3116 }
3117
3118 static char *print_binder_buffer(char *buf, char *end, const char *prefix,
3119                                  struct binder_buffer *buffer)
3120 {
3121         buf += snprintf(buf, end - buf, "%s %d: %p size %zd:%zd %s\n",
3122                         prefix, buffer->debug_id, buffer->data,
3123                         buffer->data_size, buffer->offsets_size,
3124                         buffer->transaction ? "active" : "delivered");
3125         return buf;
3126 }
3127
3128 static char *print_binder_work(char *buf, char *end, const char *prefix,
3129                                const char *transaction_prefix,
3130                                struct binder_work *w)
3131 {
3132         struct binder_node *node;
3133         struct binder_transaction *t;
3134
3135         switch (w->type) {
3136         case BINDER_WORK_TRANSACTION:
3137                 t = container_of(w, struct binder_transaction, work);
3138                 buf = print_binder_transaction(buf, end, transaction_prefix, t);
3139                 break;
3140         case BINDER_WORK_TRANSACTION_COMPLETE:
3141                 buf += snprintf(buf, end - buf,
3142                                 "%stransaction complete\n", prefix);
3143                 break;
3144         case BINDER_WORK_NODE:
3145                 node = container_of(w, struct binder_node, work);
3146                 buf += snprintf(buf, end - buf, "%snode work %d: u%p c%p\n",
3147                                 prefix, node->debug_id, node->ptr,
3148                                 node->cookie);
3149                 break;
3150         case BINDER_WORK_DEAD_BINDER:
3151                 buf += snprintf(buf, end - buf, "%shas dead binder\n", prefix);
3152                 break;
3153         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3154                 buf += snprintf(buf, end - buf,
3155                                 "%shas cleared dead binder\n", prefix);
3156                 break;
3157         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3158                 buf += snprintf(buf, end - buf,
3159                                 "%shas cleared death notification\n", prefix);
3160                 break;
3161         default:
3162                 buf += snprintf(buf, end - buf, "%sunknown work: type %d\n",
3163                                 prefix, w->type);
3164                 break;
3165         }
3166         return buf;
3167 }
3168
3169 static char *print_binder_thread(char *buf, char *end,
3170                                  struct binder_thread *thread,
3171                                  int print_always)
3172 {
3173         struct binder_transaction *t;
3174         struct binder_work *w;
3175         char *start_buf = buf;
3176         char *header_buf;
3177
3178         buf += snprintf(buf, end - buf, "  thread %d: l %02x\n",
3179                         thread->pid, thread->looper);
3180         header_buf = buf;
3181         t = thread->transaction_stack;
3182         while (t) {
3183                 if (buf >= end)
3184                         break;
3185                 if (t->from == thread) {
3186                         buf = print_binder_transaction(buf, end,
3187                                                 "    outgoing transaction", t);
3188                         t = t->from_parent;
3189                 } else if (t->to_thread == thread) {
3190                         buf = print_binder_transaction(buf, end,
3191                                                 "    incoming transaction", t);
3192                         t = t->to_parent;
3193                 } else {
3194                         buf = print_binder_transaction(buf, end,
3195                                                 "    bad transaction", t);
3196                         t = NULL;
3197                 }
3198         }
3199         list_for_each_entry(w, &thread->todo, entry) {
3200                 if (buf >= end)
3201                         break;
3202                 buf = print_binder_work(buf, end, "    ",
3203                                         "    pending transaction", w);
3204         }
3205         if (!print_always && buf == header_buf)
3206                 buf = start_buf;
3207         return buf;
3208 }
3209
3210 static char *print_binder_node(char *buf, char *end, struct binder_node *node)
3211 {
3212         struct binder_ref *ref;
3213         struct hlist_node *pos;
3214         struct binder_work *w;
3215         int count;
3216
3217         count = 0;
3218         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3219                 count++;
3220
3221         buf += snprintf(buf, end - buf,
3222                         "  node %d: u%p c%p hs %d hw %d ls %d lw %d "
3223                         "is %d iw %d",
3224                         node->debug_id, node->ptr, node->cookie,
3225                         node->has_strong_ref, node->has_weak_ref,
3226                         node->local_strong_refs, node->local_weak_refs,
3227                         node->internal_strong_refs, count);
3228         if (buf >= end)
3229                 return buf;
3230         if (count) {
3231                 buf += snprintf(buf, end - buf, " proc");
3232                 if (buf >= end)
3233                         return buf;
3234                 hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
3235                         buf += snprintf(buf, end - buf, " %d", ref->proc->pid);
3236                         if (buf >= end)
3237                                 return buf;
3238                 }
3239         }
3240         buf += snprintf(buf, end - buf, "\n");
3241         list_for_each_entry(w, &node->async_todo, entry) {
3242                 if (buf >= end)
3243                         break;
3244                 buf = print_binder_work(buf, end, "    ",
3245                                         "    pending async transaction", w);
3246         }
3247         return buf;
3248 }
3249
3250 static char *print_binder_ref(char *buf, char *end, struct binder_ref *ref)
3251 {
3252         buf += snprintf(buf, end - buf,
3253                         "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3254                         ref->debug_id, ref->desc,
3255                         ref->node->proc ? "" : "dead ", ref->node->debug_id,
3256                         ref->strong, ref->weak, ref->death);
3257         return buf;
3258 }
3259
3260 static char *print_binder_proc(char *buf, char *end,
3261                                struct binder_proc *proc, int print_all)
3262 {
3263         struct binder_work *w;
3264         struct rb_node *n;
3265         char *start_buf = buf;
3266         char *header_buf;
3267
3268         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3269         header_buf = buf;
3270
3271         for (n = rb_first(&proc->threads);
3272              n != NULL && buf < end;
3273              n = rb_next(n))
3274                 buf = print_binder_thread(buf, end,
3275                                           rb_entry(n, struct binder_thread,
3276                                                    rb_node), print_all);
3277         for (n = rb_first(&proc->nodes);
3278              n != NULL && buf < end;
3279              n = rb_next(n)) {
3280                 struct binder_node *node = rb_entry(n, struct binder_node,
3281                                                     rb_node);
3282                 if (print_all || node->has_async_transaction)
3283                         buf = print_binder_node(buf, end, node);
3284         }
3285         if (print_all) {
3286                 for (n = rb_first(&proc->refs_by_desc);
3287                      n != NULL && buf < end;
3288                      n = rb_next(n))
3289                         buf = print_binder_ref(buf, end,
3290                                                rb_entry(n, struct binder_ref,
3291                                                         rb_node_desc));
3292         }
3293         for (n = rb_first(&proc->allocated_buffers);
3294              n != NULL && buf < end;
3295              n = rb_next(n))
3296                 buf = print_binder_buffer(buf, end, "  buffer",
3297                                           rb_entry(n, struct binder_buffer,
3298                                                    rb_node));
3299         list_for_each_entry(w, &proc->todo, entry) {
3300                 if (buf >= end)
3301                         break;
3302                 buf = print_binder_work(buf, end, "  ",
3303                                         "  pending transaction", w);
3304         }
3305         list_for_each_entry(w, &proc->delivered_death, entry) {
3306                 if (buf >= end)
3307                         break;
3308                 buf += snprintf(buf, end - buf,
3309                                 "  has delivered dead binder\n");
3310                 break;
3311         }
3312         if (!print_all && buf == header_buf)
3313                 buf = start_buf;
3314         return buf;
3315 }
3316
3317 static const char *binder_return_strings[] = {
3318         "BR_ERROR",
3319         "BR_OK",
3320         "BR_TRANSACTION",
3321         "BR_REPLY",
3322         "BR_ACQUIRE_RESULT",
3323         "BR_DEAD_REPLY",
3324         "BR_TRANSACTION_COMPLETE",
3325         "BR_INCREFS",
3326         "BR_ACQUIRE",
3327         "BR_RELEASE",
3328         "BR_DECREFS",
3329         "BR_ATTEMPT_ACQUIRE",
3330         "BR_NOOP",
3331         "BR_SPAWN_LOOPER",
3332         "BR_FINISHED",
3333         "BR_DEAD_BINDER",
3334         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3335         "BR_FAILED_REPLY"
3336 };
3337
3338 static const char *binder_command_strings[] = {
3339         "BC_TRANSACTION",
3340         "BC_REPLY",
3341         "BC_ACQUIRE_RESULT",
3342         "BC_FREE_BUFFER",
3343         "BC_INCREFS",
3344         "BC_ACQUIRE",
3345         "BC_RELEASE",
3346         "BC_DECREFS",
3347         "BC_INCREFS_DONE",
3348         "BC_ACQUIRE_DONE",
3349         "BC_ATTEMPT_ACQUIRE",
3350         "BC_REGISTER_LOOPER",
3351         "BC_ENTER_LOOPER",
3352         "BC_EXIT_LOOPER",
3353         "BC_REQUEST_DEATH_NOTIFICATION",
3354         "BC_CLEAR_DEATH_NOTIFICATION",
3355         "BC_DEAD_BINDER_DONE"
3356 };
3357
3358 static const char *binder_objstat_strings[] = {
3359         "proc",
3360         "thread",
3361         "node",
3362         "ref",
3363         "death",
3364         "transaction",
3365         "transaction_complete"
3366 };
3367
3368 static char *print_binder_stats(char *buf, char *end, const char *prefix,
3369                                 struct binder_stats *stats)
3370 {
3371         int i;
3372
3373         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3374                         ARRAY_SIZE(binder_command_strings));
3375         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3376                 if (stats->bc[i])
3377                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3378                                         binder_command_strings[i],
3379                                         stats->bc[i]);
3380                 if (buf >= end)
3381                         return buf;
3382         }
3383
3384         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3385                         ARRAY_SIZE(binder_return_strings));
3386         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3387                 if (stats->br[i])
3388                         buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3389                                         binder_return_strings[i], stats->br[i]);
3390                 if (buf >= end)
3391                         return buf;
3392         }
3393
3394         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3395                         ARRAY_SIZE(binder_objstat_strings));
3396         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3397                         ARRAY_SIZE(stats->obj_deleted));
3398         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3399                 if (stats->obj_created[i] || stats->obj_deleted[i])
3400                         buf += snprintf(buf, end - buf,
3401                                         "%s%s: active %d total %d\n", prefix,
3402                                         binder_objstat_strings[i],
3403                                         stats->obj_created[i] -
3404                                                 stats->obj_deleted[i],
3405                                         stats->obj_created[i]);
3406                 if (buf >= end)
3407                         return buf;
3408         }
3409         return buf;
3410 }
3411
3412 static char *print_binder_proc_stats(char *buf, char *end,
3413                                      struct binder_proc *proc)
3414 {
3415         struct binder_work *w;
3416         struct rb_node *n;
3417         int count, strong, weak;
3418
3419         buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3420         if (buf >= end)
3421                 return buf;
3422         count = 0;
3423         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3424                 count++;
3425         buf += snprintf(buf, end - buf, "  threads: %d\n", count);
3426         if (buf >= end)
3427                 return buf;
3428         buf += snprintf(buf, end - buf, "  requested threads: %d+%d/%d\n"
3429                         "  ready threads %d\n"
3430                         "  free async space %zd\n", proc->requested_threads,
3431                         proc->requested_threads_started, proc->max_threads,
3432                         proc->ready_threads, proc->free_async_space);
3433         if (buf >= end)
3434                 return buf;
3435         count = 0;
3436         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3437                 count++;
3438         buf += snprintf(buf, end - buf, "  nodes: %d\n", count);
3439         if (buf >= end)
3440                 return buf;
3441         count = 0;
3442         strong = 0;
3443         weak = 0;
3444         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3445                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3446                                                   rb_node_desc);
3447                 count++;
3448                 strong += ref->strong;
3449                 weak += ref->weak;
3450         }
3451         buf += snprintf(buf, end - buf, "  refs: %d s %d w %d\n",
3452                         count, strong, weak);
3453         if (buf >= end)
3454                 return buf;
3455
3456         count = 0;
3457         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3458                 count++;
3459         buf += snprintf(buf, end - buf, "  buffers: %d\n", count);
3460         if (buf >= end)
3461                 return buf;
3462
3463         count = 0;
3464         list_for_each_entry(w, &proc->todo, entry) {
3465                 switch (w->type) {
3466                 case BINDER_WORK_TRANSACTION:
3467                         count++;
3468                         break;
3469                 default:
3470                         break;
3471                 }
3472         }
3473         buf += snprintf(buf, end - buf, "  pending transactions: %d\n", count);
3474         if (buf >= end)
3475                 return buf;
3476
3477         buf = print_binder_stats(buf, end, "  ", &proc->stats);
3478
3479         return buf;
3480 }
3481
3482
3483 static int binder_read_proc_state(char *page, char **start, off_t off,
3484                                   int count, int *eof, void *data)
3485 {
3486         struct binder_proc *proc;
3487         struct hlist_node *pos;
3488         struct binder_node *node;
3489         int len = 0;
3490         char *buf = page;
3491         char *end = page + PAGE_SIZE;
3492         int do_lock = !binder_debug_no_lock;
3493
3494         if (off)
3495                 return 0;
3496
3497         if (do_lock)
3498                 mutex_lock(&binder_lock);
3499
3500         buf += snprintf(buf, end - buf, "binder state:\n");
3501
3502         if (!hlist_empty(&binder_dead_nodes))
3503                 buf += snprintf(buf, end - buf, "dead nodes:\n");
3504         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) {
3505                 if (buf >= end)
3506                         break;
3507                 buf = print_binder_node(buf, end, node);
3508         }
3509
3510         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3511                 if (buf >= end)
3512                         break;
3513                 buf = print_binder_proc(buf, end, proc, 1);
3514         }
3515         if (do_lock)
3516                 mutex_unlock(&binder_lock);
3517         if (buf > page + PAGE_SIZE)
3518                 buf = page + PAGE_SIZE;
3519
3520         *start = page + off;
3521
3522         len = buf - page;
3523         if (len > off)
3524                 len -= off;
3525         else
3526                 len = 0;
3527
3528         return len < count ? len  : count;
3529 }
3530
3531 static int binder_read_proc_stats(char *page, char **start, off_t off,
3532                                   int count, int *eof, void *data)
3533 {
3534         struct binder_proc *proc;
3535         struct hlist_node *pos;
3536         int len = 0;
3537         char *p = page;
3538         int do_lock = !binder_debug_no_lock;
3539
3540         if (off)
3541                 return 0;
3542
3543         if (do_lock)
3544                 mutex_lock(&binder_lock);
3545
3546         p += snprintf(p, PAGE_SIZE, "binder stats:\n");
3547
3548         p = print_binder_stats(p, page + PAGE_SIZE, "", &binder_stats);
3549
3550         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3551                 if (p >= page + PAGE_SIZE)
3552                         break;
3553                 p = print_binder_proc_stats(p, page + PAGE_SIZE, proc);
3554         }
3555         if (do_lock)
3556                 mutex_unlock(&binder_lock);
3557         if (p > page + PAGE_SIZE)
3558                 p = page + PAGE_SIZE;
3559
3560         *start = page + off;
3561
3562         len = p - page;
3563         if (len > off)
3564                 len -= off;
3565         else
3566                 len = 0;
3567
3568         return len < count ? len  : count;
3569 }
3570
3571 static int binder_read_proc_transactions(char *page, char **start, off_t off,
3572                                          int count, int *eof, void *data)
3573 {
3574         struct binder_proc *proc;
3575         struct hlist_node *pos;
3576         int len = 0;
3577         char *buf = page;
3578         char *end = page + PAGE_SIZE;
3579         int do_lock = !binder_debug_no_lock;
3580
3581         if (off)
3582                 return 0;
3583
3584         if (do_lock)
3585                 mutex_lock(&binder_lock);
3586
3587         buf += snprintf(buf, end - buf, "binder transactions:\n");
3588         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3589                 if (buf >= end)
3590                         break;
3591                 buf = print_binder_proc(buf, end, proc, 0);
3592         }
3593         if (do_lock)
3594                 mutex_unlock(&binder_lock);
3595         if (buf > page + PAGE_SIZE)
3596                 buf = page + PAGE_SIZE;
3597
3598         *start = page + off;
3599
3600         len = buf - page;
3601         if (len > off)
3602                 len -= off;
3603         else
3604                 len = 0;
3605
3606         return len < count ? len  : count;
3607 }
3608
3609 static int binder_read_proc_proc(char *page, char **start, off_t off,
3610                                  int count, int *eof, void *data)
3611 {
3612         struct binder_proc *proc = data;
3613         int len = 0;
3614         char *p = page;
3615         int do_lock = !binder_debug_no_lock;
3616
3617         if (off)
3618                 return 0;
3619
3620         if (do_lock)
3621                 mutex_lock(&binder_lock);
3622         p += snprintf(p, PAGE_SIZE, "binder proc state:\n");
3623         p = print_binder_proc(p, page + PAGE_SIZE, proc, 1);
3624         if (do_lock)
3625                 mutex_unlock(&binder_lock);
3626
3627         if (p > page + PAGE_SIZE)
3628                 p = page + PAGE_SIZE;
3629         *start = page + off;
3630
3631         len = p - page;
3632         if (len > off)
3633                 len -= off;
3634         else
3635                 len = 0;
3636
3637         return len < count ? len  : count;
3638 }
3639
3640 static char *print_binder_transaction_log_entry(char *buf, char *end,
3641                                         struct binder_transaction_log_entry *e)
3642 {
3643         buf += snprintf(buf, end - buf,
3644                         "%d: %s from %d:%d to %d:%d node %d handle %d "
3645                         "size %d:%d\n",
3646                         e->debug_id, (e->call_type == 2) ? "reply" :
3647                         ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3648                         e->from_thread, e->to_proc, e->to_thread, e->to_node,
3649                         e->target_handle, e->data_size, e->offsets_size);
3650         return buf;
3651 }
3652
3653 static int binder_read_proc_transaction_log(
3654         char *page, char **start, off_t off, int count, int *eof, void *data)
3655 {
3656         struct binder_transaction_log *log = data;
3657         int len = 0;
3658         int i;
3659         char *buf = page;
3660         char *end = page + PAGE_SIZE;
3661
3662         if (off)
3663                 return 0;
3664
3665         if (log->full) {
3666                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++) {
3667                         if (buf >= end)
3668                                 break;
3669                         buf = print_binder_transaction_log_entry(buf, end,
3670                                                                 &log->entry[i]);
3671                 }
3672         }
3673         for (i = 0; i < log->next; i++) {
3674                 if (buf >= end)
3675                         break;
3676                 buf = print_binder_transaction_log_entry(buf, end,
3677                                                          &log->entry[i]);
3678         }
3679
3680         *start = page + off;
3681
3682         len = buf - page;
3683         if (len > off)
3684                 len -= off;
3685         else
3686                 len = 0;
3687
3688         return len < count ? len  : count;
3689 }
3690
3691 static const struct file_operations binder_fops = {
3692         .owner = THIS_MODULE,
3693         .poll = binder_poll,
3694         .unlocked_ioctl = binder_ioctl,
3695         .mmap = binder_mmap,
3696         .open = binder_open,
3697         .flush = binder_flush,
3698         .release = binder_release,
3699 };
3700
3701 static struct miscdevice binder_miscdev = {
3702         .minor = MISC_DYNAMIC_MINOR,
3703         .name = "binder",
3704         .fops = &binder_fops
3705 };
3706
3707 static int __init binder_init(void)
3708 {
3709         int ret;
3710
3711         binder_proc_dir_entry_root = proc_mkdir("binder", NULL);
3712         if (binder_proc_dir_entry_root)
3713                 binder_proc_dir_entry_proc = proc_mkdir("proc",
3714                                                 binder_proc_dir_entry_root);
3715         ret = misc_register(&binder_miscdev);
3716         if (binder_proc_dir_entry_root) {
3717                 create_proc_read_entry("state",
3718                                        S_IRUGO,
3719                                        binder_proc_dir_entry_root,
3720                                        binder_read_proc_state,
3721                                        NULL);
3722                 create_proc_read_entry("stats",
3723                                        S_IRUGO,
3724                                        binder_proc_dir_entry_root,
3725                                        binder_read_proc_stats,
3726                                        NULL);
3727                 create_proc_read_entry("transactions",
3728                                        S_IRUGO,
3729                                        binder_proc_dir_entry_root,
3730                                        binder_read_proc_transactions,
3731                                        NULL);
3732                 create_proc_read_entry("transaction_log",
3733                                        S_IRUGO,
3734                                        binder_proc_dir_entry_root,
3735                                        binder_read_proc_transaction_log,
3736                                        &binder_transaction_log);
3737                 create_proc_read_entry("failed_transaction_log",
3738                                        S_IRUGO,
3739                                        binder_proc_dir_entry_root,
3740                                        binder_read_proc_transaction_log,
3741                                        &binder_transaction_log_failed);
3742         }
3743         return ret;
3744 }
3745
3746 device_initcall(binder_init);
3747
3748 MODULE_LICENSE("GPL v2");