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

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