Logo Search packages:      
Sourcecode: linux-fsl-imx51 version File versions  Download package

binder.c

/* binder.c
 *
 * Android IPC Subsystem
 *
 * Copyright (C) 2007-2008 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <asm/cacheflush.h>
#include <linux/fdtable.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/nsproxy.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include "binder.h"

static DEFINE_MUTEX(binder_lock);
static HLIST_HEAD(binder_procs);
static struct binder_node *binder_context_mgr_node;
static uid_t binder_context_mgr_uid = -1;
static int binder_last_id;
static struct proc_dir_entry *binder_proc_dir_entry_root;
static struct proc_dir_entry *binder_proc_dir_entry_proc;
static struct hlist_head binder_dead_nodes;
static HLIST_HEAD(binder_deferred_list);
static DEFINE_MUTEX(binder_deferred_lock);

static int binder_read_proc_proc(char *page, char **start, off_t off,
                         int count, int *eof, void *data);

/* This is only defined in include/asm-arm/sizes.h */
#ifndef SZ_1K
#define SZ_1K                               0x400
#endif

#ifndef SZ_4M
#define SZ_4M                               0x400000
#endif

#define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)

#define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)

enum {
      BINDER_DEBUG_USER_ERROR             = 1U << 0,
      BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
      BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
      BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
      BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
      BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
      BINDER_DEBUG_READ_WRITE             = 1U << 6,
      BINDER_DEBUG_USER_REFS              = 1U << 7,
      BINDER_DEBUG_THREADS                = 1U << 8,
      BINDER_DEBUG_TRANSACTION            = 1U << 9,
      BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
      BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
      BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
      BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
      BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
      BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
};
static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
      BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);

static int binder_debug_no_lock;
module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);

static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
static int binder_stop_on_user_error;

static int binder_set_stop_on_user_error(const char *val,
                               struct kernel_param *kp)
{
      int ret;
      ret = param_set_int(val, kp);
      if (binder_stop_on_user_error < 2)
            wake_up(&binder_user_error_wait);
      return ret;
}
module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
      param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);

#define binder_user_error(x...) \
      do { \
            if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
                  printk(KERN_INFO x); \
            if (binder_stop_on_user_error) \
                  binder_stop_on_user_error = 2; \
      } while (0)

enum {
      BINDER_STAT_PROC,
      BINDER_STAT_THREAD,
      BINDER_STAT_NODE,
      BINDER_STAT_REF,
      BINDER_STAT_DEATH,
      BINDER_STAT_TRANSACTION,
      BINDER_STAT_TRANSACTION_COMPLETE,
      BINDER_STAT_COUNT
};

00122 struct binder_stats {
      int br[_IOC_NR(BR_FAILED_REPLY) + 1];
      int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
      int obj_created[BINDER_STAT_COUNT];
      int obj_deleted[BINDER_STAT_COUNT];
};

static struct binder_stats binder_stats;

00131 struct binder_transaction_log_entry {
      int debug_id;
      int call_type;
      int from_proc;
      int from_thread;
      int target_handle;
      int to_proc;
      int to_thread;
      int to_node;
      int data_size;
      int offsets_size;
};
00143 struct binder_transaction_log {
      int next;
      int full;
      struct binder_transaction_log_entry entry[32];
};
struct binder_transaction_log binder_transaction_log;
struct binder_transaction_log binder_transaction_log_failed;

static struct binder_transaction_log_entry *binder_transaction_log_add(
      struct binder_transaction_log *log)
{
      struct binder_transaction_log_entry *e;
      e = &log->entry[log->next];
      memset(e, 0, sizeof(*e));
      log->next++;
      if (log->next == ARRAY_SIZE(log->entry)) {
            log->next = 0;
            log->full = 1;
      }
      return e;
}

00165 struct binder_work {
      struct list_head entry;
      enum {
            BINDER_WORK_TRANSACTION = 1,
            BINDER_WORK_TRANSACTION_COMPLETE,
            BINDER_WORK_NODE,
            BINDER_WORK_DEAD_BINDER,
            BINDER_WORK_DEAD_BINDER_AND_CLEAR,
            BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
      } type;
};

00177 struct binder_node {
      int debug_id;
      struct binder_work work;
      union {
            struct rb_node rb_node;
            struct hlist_node dead_node;
      };
      struct binder_proc *proc;
      struct hlist_head refs;
      int internal_strong_refs;
      int local_weak_refs;
      int local_strong_refs;
      void __user *ptr;
      void __user *cookie;
      unsigned has_strong_ref:1;
      unsigned pending_strong_ref:1;
      unsigned has_weak_ref:1;
      unsigned pending_weak_ref:1;
      unsigned has_async_transaction:1;
      unsigned accept_fds:1;
      unsigned min_priority:8;
      struct list_head async_todo;
};

00201 struct binder_ref_death {
      struct binder_work work;
      void __user *cookie;
};

00206 struct binder_ref {
      /* Lookups needed: */
      /*   node + proc => ref (transaction) */
      /*   desc + proc => ref (transaction, inc/dec ref) */
      /*   node => refs + procs (proc exit) */
      int debug_id;
      struct rb_node rb_node_desc;
      struct rb_node rb_node_node;
      struct hlist_node node_entry;
      struct binder_proc *proc;
      struct binder_node *node;
      uint32_t desc;
      int strong;
      int weak;
      struct binder_ref_death *death;
};

00223 struct binder_buffer {
      struct list_head entry; /* free and allocated entries by addesss */
      struct rb_node rb_node; /* free entry by size or allocated entry */
                        /* by address */
      unsigned free:1;
      unsigned allow_user_free:1;
      unsigned async_transaction:1;
      unsigned debug_id:29;

      struct binder_transaction *transaction;

      struct binder_node *target_node;
      size_t data_size;
      size_t offsets_size;
      uint8_t data[0];
};

enum {
      BINDER_DEFERRED_PUT_FILES    = 0x01,
      BINDER_DEFERRED_FLUSH        = 0x02,
      BINDER_DEFERRED_RELEASE      = 0x04,
};

00246 struct binder_proc {
      struct hlist_node proc_node;
      struct rb_root threads;
      struct rb_root nodes;
      struct rb_root refs_by_desc;
      struct rb_root refs_by_node;
      int pid;
      struct vm_area_struct *vma;
      struct task_struct *tsk;
      struct files_struct *files;
      struct hlist_node deferred_work_node;
      int deferred_work;
      void *buffer;
      ptrdiff_t user_buffer_offset;

      struct list_head buffers;
      struct rb_root free_buffers;
      struct rb_root allocated_buffers;
      size_t free_async_space;

      struct page **pages;
      size_t buffer_size;
      uint32_t buffer_free;
      struct list_head todo;
      wait_queue_head_t wait;
      struct binder_stats stats;
      struct list_head delivered_death;
      int max_threads;
      int requested_threads;
      int requested_threads_started;
      int ready_threads;
      long default_priority;
};

enum {
      BINDER_LOOPER_STATE_REGISTERED  = 0x01,
      BINDER_LOOPER_STATE_ENTERED     = 0x02,
      BINDER_LOOPER_STATE_EXITED      = 0x04,
      BINDER_LOOPER_STATE_INVALID     = 0x08,
      BINDER_LOOPER_STATE_WAITING     = 0x10,
      BINDER_LOOPER_STATE_NEED_RETURN = 0x20
};

00289 struct binder_thread {
      struct binder_proc *proc;
      struct rb_node rb_node;
      int pid;
      int looper;
      struct binder_transaction *transaction_stack;
      struct list_head todo;
      uint32_t return_error; /* Write failed, return error code in read buf */
      uint32_t return_error2; /* Write failed, return error code in read */
            /* buffer. Used when sending a reply to a dead process that */
            /* we are also waiting on */
      wait_queue_head_t wait;
      struct binder_stats stats;
};

00304 struct binder_transaction {
      int debug_id;
      struct binder_work work;
      struct binder_thread *from;
      struct binder_transaction *from_parent;
      struct binder_proc *to_proc;
      struct binder_thread *to_thread;
      struct binder_transaction *to_parent;
      unsigned need_reply:1;
      /* unsigned is_dead:1; */     /* not used at the moment */

      struct binder_buffer *buffer;
      unsigned int      code;
      unsigned int      flags;
      long  priority;
      long  saved_priority;
      uid_t sender_euid;
};

static void binder_defer_work(struct binder_proc *proc, int defer);

/*
 * copied from get_unused_fd_flags
 */
int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
{
      struct files_struct *files = proc->files;
      int fd, error;
      struct fdtable *fdt;
      unsigned long rlim_cur;
      unsigned long irqs;

      if (files == NULL)
            return -ESRCH;

      error = -EMFILE;
      spin_lock(&files->file_lock);

repeat:
      fdt = files_fdtable(files);
      fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
                        files->next_fd);

      /*
       * N.B. For clone tasks sharing a files structure, this test
       * will limit the total number of files that can be opened.
       */
      rlim_cur = 0;
      if (lock_task_sighand(proc->tsk, &irqs)) {
            rlim_cur = proc->tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
            unlock_task_sighand(proc->tsk, &irqs);
      }
      if (fd >= rlim_cur)
            goto out;

      /* Do we need to expand the fd array or fd set?  */
      error = expand_files(files, fd);
      if (error < 0)
            goto out;

      if (error) {
            /*
             * If we needed to expand the fs array we
             * might have blocked - try again.
             */
            error = -EMFILE;
            goto repeat;
      }

      FD_SET(fd, fdt->open_fds);
      if (flags & O_CLOEXEC)
            FD_SET(fd, fdt->close_on_exec);
      else
            FD_CLR(fd, fdt->close_on_exec);
      files->next_fd = fd + 1;
#if 1
      /* Sanity check */
      if (fdt->fd[fd] != NULL) {
            printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
            fdt->fd[fd] = NULL;
      }
#endif
      error = fd;

out:
      spin_unlock(&files->file_lock);
      return error;
}

/*
 * copied from fd_install
 */
static void task_fd_install(
      struct binder_proc *proc, unsigned int fd, struct file *file)
{
      struct files_struct *files = proc->files;
      struct fdtable *fdt;

      if (files == NULL)
            return;

      spin_lock(&files->file_lock);
      fdt = files_fdtable(files);
      BUG_ON(fdt->fd[fd] != NULL);
      rcu_assign_pointer(fdt->fd[fd], file);
      spin_unlock(&files->file_lock);
}

/*
 * copied from __put_unused_fd in open.c
 */
static void __put_unused_fd(struct files_struct *files, unsigned int fd)
{
      struct fdtable *fdt = files_fdtable(files);
      __FD_CLR(fd, fdt->open_fds);
      if (fd < files->next_fd)
            files->next_fd = fd;
}

/*
 * copied from sys_close
 */
static long task_close_fd(struct binder_proc *proc, unsigned int fd)
{
      struct file *filp;
      struct files_struct *files = proc->files;
      struct fdtable *fdt;
      int retval;

      if (files == NULL)
            return -ESRCH;

      spin_lock(&files->file_lock);
      fdt = files_fdtable(files);
      if (fd >= fdt->max_fds)
            goto out_unlock;
      filp = fdt->fd[fd];
      if (!filp)
            goto out_unlock;
      rcu_assign_pointer(fdt->fd[fd], NULL);
      FD_CLR(fd, fdt->close_on_exec);
      __put_unused_fd(files, fd);
      spin_unlock(&files->file_lock);
      retval = filp_close(filp, files);

      /* can't restart close syscall because file table entry was cleared */
      if (unlikely(retval == -ERESTARTSYS ||
                 retval == -ERESTARTNOINTR ||
                 retval == -ERESTARTNOHAND ||
                 retval == -ERESTART_RESTARTBLOCK))
            retval = -EINTR;

      return retval;

out_unlock:
      spin_unlock(&files->file_lock);
      return -EBADF;
}

static void binder_set_nice(long nice)
{
      long min_nice;
      if (can_nice(current, nice)) {
            set_user_nice(current, nice);
            return;
      }
      min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
      if (binder_debug_mask & BINDER_DEBUG_PRIORITY_CAP)
            printk(KERN_INFO "binder: %d: nice value %ld not allowed use "
                   "%ld instead\n", current->pid, nice, min_nice);
      set_user_nice(current, min_nice);
      if (min_nice < 20)
            return;
      binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
}

static size_t binder_buffer_size(struct binder_proc *proc,
                         struct binder_buffer *buffer)
{
      if (list_is_last(&buffer->entry, &proc->buffers))
            return proc->buffer + proc->buffer_size - (void *)buffer->data;
      else
            return (size_t)list_entry(buffer->entry.next,
                  struct binder_buffer, entry) - (size_t)buffer->data;
}

static void binder_insert_free_buffer(struct binder_proc *proc,
                              struct binder_buffer *new_buffer)
{
      struct rb_node **p = &proc->free_buffers.rb_node;
      struct rb_node *parent = NULL;
      struct binder_buffer *buffer;
      size_t buffer_size;
      size_t new_buffer_size;

      BUG_ON(!new_buffer->free);

      new_buffer_size = binder_buffer_size(proc, new_buffer);

      if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
            printk(KERN_INFO "binder: %d: add free buffer, size %zd, "
                   "at %p\n", proc->pid, new_buffer_size, new_buffer);

      while (*p) {
            parent = *p;
            buffer = rb_entry(parent, struct binder_buffer, rb_node);
            BUG_ON(!buffer->free);

            buffer_size = binder_buffer_size(proc, buffer);

            if (new_buffer_size < buffer_size)
                  p = &parent->rb_left;
            else
                  p = &parent->rb_right;
      }
      rb_link_node(&new_buffer->rb_node, parent, p);
      rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
}

static void binder_insert_allocated_buffer(struct binder_proc *proc,
                                 struct binder_buffer *new_buffer)
{
      struct rb_node **p = &proc->allocated_buffers.rb_node;
      struct rb_node *parent = NULL;
      struct binder_buffer *buffer;

      BUG_ON(new_buffer->free);

      while (*p) {
            parent = *p;
            buffer = rb_entry(parent, struct binder_buffer, rb_node);
            BUG_ON(buffer->free);

            if (new_buffer < buffer)
                  p = &parent->rb_left;
            else if (new_buffer > buffer)
                  p = &parent->rb_right;
            else
                  BUG();
      }
      rb_link_node(&new_buffer->rb_node, parent, p);
      rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
}

static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
                                      void __user *user_ptr)
{
      struct rb_node *n = proc->allocated_buffers.rb_node;
      struct binder_buffer *buffer;
      struct binder_buffer *kern_ptr;

      kern_ptr = user_ptr - proc->user_buffer_offset
            - offsetof(struct binder_buffer, data);

      while (n) {
            buffer = rb_entry(n, struct binder_buffer, rb_node);
            BUG_ON(buffer->free);

            if (kern_ptr < buffer)
                  n = n->rb_left;
            else if (kern_ptr > buffer)
                  n = n->rb_right;
            else
                  return buffer;
      }
      return NULL;
}

static int binder_update_page_range(struct binder_proc *proc, int allocate,
                            void *start, void *end,
                            struct vm_area_struct *vma)
{
      void *page_addr;
      unsigned long user_page_addr;
      struct vm_struct tmp_area;
      struct page **page;
      struct mm_struct *mm;

      if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
            printk(KERN_INFO "binder: %d: %s pages %p-%p\n",
                   proc->pid, allocate ? "allocate" : "free", start, end);

      if (end <= start)
            return 0;

      if (vma)
            mm = NULL;
      else
            mm = get_task_mm(proc->tsk);

      if (mm) {
            down_write(&mm->mmap_sem);
            vma = proc->vma;
      }

      if (allocate == 0)
            goto free_range;

      if (vma == NULL) {
            printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
                   "map pages in userspace, no vma\n", proc->pid);
            goto err_no_vma;
      }

      for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
            int ret;
            struct page **page_array_ptr;
            page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];

            BUG_ON(*page);
            *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
            if (*page == NULL) {
                  printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
                         "for page at %p\n", proc->pid, page_addr);
                  goto err_alloc_page_failed;
            }
            tmp_area.addr = page_addr;
            tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
            page_array_ptr = page;
            ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
            if (ret) {
                  printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
                         "to map page at %p in kernel\n",
                         proc->pid, page_addr);
                  goto err_map_kernel_failed;
            }
            user_page_addr =
                  (uintptr_t)page_addr + proc->user_buffer_offset;
            ret = vm_insert_page(vma, user_page_addr, page[0]);
            if (ret) {
                  printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
                         "to map page at %lx in userspace\n",
                         proc->pid, user_page_addr);
                  goto err_vm_insert_page_failed;
            }
            /* vm_insert_page does not seem to increment the refcount */
      }
      if (mm) {
            up_write(&mm->mmap_sem);
            mmput(mm);
      }
      return 0;

free_range:
      for (page_addr = end - PAGE_SIZE; page_addr >= start;
           page_addr -= PAGE_SIZE) {
            page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
            if (vma)
                  zap_page_range(vma, (uintptr_t)page_addr +
                        proc->user_buffer_offset, PAGE_SIZE, NULL);
err_vm_insert_page_failed:
            unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
err_map_kernel_failed:
            __free_page(*page);
            *page = NULL;
err_alloc_page_failed:
            ;
      }
err_no_vma:
      if (mm) {
            up_write(&mm->mmap_sem);
            mmput(mm);
      }
      return -ENOMEM;
}

static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
                                    size_t data_size,
                                    size_t offsets_size, int is_async)
{
      struct rb_node *n = proc->free_buffers.rb_node;
      struct binder_buffer *buffer;
      size_t buffer_size;
      struct rb_node *best_fit = NULL;
      void *has_page_addr;
      void *end_page_addr;
      size_t size;

      if (proc->vma == NULL) {
            printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n",
                   proc->pid);
            return NULL;
      }

      size = ALIGN(data_size, sizeof(void *)) +
            ALIGN(offsets_size, sizeof(void *));

      if (size < data_size || size < offsets_size) {
            binder_user_error("binder: %d: got transaction with invalid "
                  "size %zd-%zd\n", proc->pid, data_size, offsets_size);
            return NULL;
      }

      if (is_async &&
          proc->free_async_space < size + sizeof(struct binder_buffer)) {
            if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                  printk(KERN_ERR
                         "binder: %d: binder_alloc_buf size %zd failed, "
                         "no async space left\n", proc->pid, size);
            return NULL;
      }

      while (n) {
            buffer = rb_entry(n, struct binder_buffer, rb_node);
            BUG_ON(!buffer->free);
            buffer_size = binder_buffer_size(proc, buffer);

            if (size < buffer_size) {
                  best_fit = n;
                  n = n->rb_left;
            } else if (size > buffer_size)
                  n = n->rb_right;
            else {
                  best_fit = n;
                  break;
            }
      }
      if (best_fit == NULL) {
            printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, "
                   "no address space\n", proc->pid, size);
            return NULL;
      }
      if (n == NULL) {
            buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
            buffer_size = binder_buffer_size(proc, buffer);
      }
      if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
            printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd got buff"
                   "er %p size %zd\n", proc->pid, size, buffer, buffer_size);

      has_page_addr =
            (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
      if (n == NULL) {
            if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
                  buffer_size = size; /* no room for other buffers */
            else
                  buffer_size = size + sizeof(struct binder_buffer);
      }
      end_page_addr =
            (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
      if (end_page_addr > has_page_addr)
            end_page_addr = has_page_addr;
      if (binder_update_page_range(proc, 1,
          (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
            return NULL;

      rb_erase(best_fit, &proc->free_buffers);
      buffer->free = 0;
      binder_insert_allocated_buffer(proc, buffer);
      if (buffer_size != size) {
            struct binder_buffer *new_buffer = (void *)buffer->data + size;
            list_add(&new_buffer->entry, &buffer->entry);
            new_buffer->free = 1;
            binder_insert_free_buffer(proc, new_buffer);
      }
      if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
            printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd got "
                   "%p\n", proc->pid, size, buffer);
      buffer->data_size = data_size;
      buffer->offsets_size = offsets_size;
      buffer->async_transaction = is_async;
      if (is_async) {
            proc->free_async_space -= size + sizeof(struct binder_buffer);
            if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
                  printk(KERN_INFO "binder: %d: binder_alloc_buf size %zd "
                         "async free %zd\n", proc->pid, size,
                         proc->free_async_space);
      }

      return buffer;
}

static void *buffer_start_page(struct binder_buffer *buffer)
{
      return (void *)((uintptr_t)buffer & PAGE_MASK);
}

static void *buffer_end_page(struct binder_buffer *buffer)
{
      return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
}

static void binder_delete_free_buffer(struct binder_proc *proc,
                              struct binder_buffer *buffer)
{
      struct binder_buffer *prev, *next = NULL;
      int free_page_end = 1;
      int free_page_start = 1;

      BUG_ON(proc->buffers.next == &buffer->entry);
      prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
      BUG_ON(!prev->free);
      if (buffer_end_page(prev) == buffer_start_page(buffer)) {
            free_page_start = 0;
            if (buffer_end_page(prev) == buffer_end_page(buffer))
                  free_page_end = 0;
            if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                  printk(KERN_INFO "binder: %d: merge free, buffer %p "
                         "share page with %p\n", proc->pid, buffer, prev);
      }

      if (!list_is_last(&buffer->entry, &proc->buffers)) {
            next = list_entry(buffer->entry.next,
                          struct binder_buffer, entry);
            if (buffer_start_page(next) == buffer_end_page(buffer)) {
                  free_page_end = 0;
                  if (buffer_start_page(next) ==
                      buffer_start_page(buffer))
                        free_page_start = 0;
                  if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                        printk(KERN_INFO "binder: %d: merge free, "
                               "buffer %p share page with %p\n",
                               proc->pid, buffer, prev);
            }
      }
      list_del(&buffer->entry);
      if (free_page_start || free_page_end) {
            if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                  printk(KERN_INFO "binder: %d: merge free, buffer %p do "
                         "not share page%s%s with with %p or %p\n",
                         proc->pid, buffer, free_page_start ? "" : " end",
                         free_page_end ? "" : " start", prev, next);
            binder_update_page_range(proc, 0, free_page_start ?
                  buffer_start_page(buffer) : buffer_end_page(buffer),
                  (free_page_end ? buffer_end_page(buffer) :
                  buffer_start_page(buffer)) + PAGE_SIZE, NULL);
      }
}

static void binder_free_buf(struct binder_proc *proc,
                      struct binder_buffer *buffer)
{
      size_t size, buffer_size;

      buffer_size = binder_buffer_size(proc, buffer);

      size = ALIGN(buffer->data_size, sizeof(void *)) +
            ALIGN(buffer->offsets_size, sizeof(void *));
      if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
            printk(KERN_INFO "binder: %d: binder_free_buf %p size %zd buffer"
                   "_size %zd\n", proc->pid, buffer, size, buffer_size);

      BUG_ON(buffer->free);
      BUG_ON(size > buffer_size);
      BUG_ON(buffer->transaction != NULL);
      BUG_ON((void *)buffer < proc->buffer);
      BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);

      if (buffer->async_transaction) {
            proc->free_async_space += size + sizeof(struct binder_buffer);
            if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
                  printk(KERN_INFO "binder: %d: binder_free_buf size %zd "
                         "async free %zd\n", proc->pid, size,
                         proc->free_async_space);
      }

      binder_update_page_range(proc, 0,
            (void *)PAGE_ALIGN((uintptr_t)buffer->data),
            (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
            NULL);
      rb_erase(&buffer->rb_node, &proc->allocated_buffers);
      buffer->free = 1;
      if (!list_is_last(&buffer->entry, &proc->buffers)) {
            struct binder_buffer *next = list_entry(buffer->entry.next,
                                    struct binder_buffer, entry);
            if (next->free) {
                  rb_erase(&next->rb_node, &proc->free_buffers);
                  binder_delete_free_buffer(proc, next);
            }
      }
      if (proc->buffers.next != &buffer->entry) {
            struct binder_buffer *prev = list_entry(buffer->entry.prev,
                                    struct binder_buffer, entry);
            if (prev->free) {
                  binder_delete_free_buffer(proc, buffer);
                  rb_erase(&prev->rb_node, &proc->free_buffers);
                  buffer = prev;
            }
      }
      binder_insert_free_buffer(proc, buffer);
}

static struct binder_node *binder_get_node(struct binder_proc *proc,
                                 void __user *ptr)
{
      struct rb_node *n = proc->nodes.rb_node;
      struct binder_node *node;

      while (n) {
            node = rb_entry(n, struct binder_node, rb_node);

            if (ptr < node->ptr)
                  n = n->rb_left;
            else if (ptr > node->ptr)
                  n = n->rb_right;
            else
                  return node;
      }
      return NULL;
}

static struct binder_node *binder_new_node(struct binder_proc *proc,
                                 void __user *ptr,
                                 void __user *cookie)
{
      struct rb_node **p = &proc->nodes.rb_node;
      struct rb_node *parent = NULL;
      struct binder_node *node;

      while (*p) {
            parent = *p;
            node = rb_entry(parent, struct binder_node, rb_node);

            if (ptr < node->ptr)
                  p = &(*p)->rb_left;
            else if (ptr > node->ptr)
                  p = &(*p)->rb_right;
            else
                  return NULL;
      }

      node = kzalloc(sizeof(*node), GFP_KERNEL);
      if (node == NULL)
            return NULL;
      binder_stats.obj_created[BINDER_STAT_NODE]++;
      rb_link_node(&node->rb_node, parent, p);
      rb_insert_color(&node->rb_node, &proc->nodes);
      node->debug_id = ++binder_last_id;
      node->proc = proc;
      node->ptr = ptr;
      node->cookie = cookie;
      node->work.type = BINDER_WORK_NODE;
      INIT_LIST_HEAD(&node->work.entry);
      INIT_LIST_HEAD(&node->async_todo);
      if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
            printk(KERN_INFO "binder: %d:%d node %d u%p c%p created\n",
                   proc->pid, current->pid, node->debug_id,
                   node->ptr, node->cookie);
      return node;
}

static int binder_inc_node(struct binder_node *node, int strong, int internal,
                     struct list_head *target_list)
{
      if (strong) {
            if (internal) {
                  if (target_list == NULL &&
                      node->internal_strong_refs == 0 &&
                      !(node == binder_context_mgr_node &&
                      node->has_strong_ref)) {
                        printk(KERN_ERR "binder: invalid inc strong "
                              "node for %d\n", node->debug_id);
                        return -EINVAL;
                  }
                  node->internal_strong_refs++;
            } else
                  node->local_strong_refs++;
            if (!node->has_strong_ref && target_list) {
                  list_del_init(&node->work.entry);
                  list_add_tail(&node->work.entry, target_list);
            }
      } else {
            if (!internal)
                  node->local_weak_refs++;
            if (!node->has_weak_ref && list_empty(&node->work.entry)) {
                  if (target_list == NULL) {
                        printk(KERN_ERR "binder: invalid inc weak node "
                              "for %d\n", node->debug_id);
                        return -EINVAL;
                  }
                  list_add_tail(&node->work.entry, target_list);
            }
      }
      return 0;
}

static int binder_dec_node(struct binder_node *node, int strong, int internal)
{
      if (strong) {
            if (internal)
                  node->internal_strong_refs--;
            else
                  node->local_strong_refs--;
            if (node->local_strong_refs || node->internal_strong_refs)
                  return 0;
      } else {
            if (!internal)
                  node->local_weak_refs--;
            if (node->local_weak_refs || !hlist_empty(&node->refs))
                  return 0;
      }
      if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
            if (list_empty(&node->work.entry)) {
                  list_add_tail(&node->work.entry, &node->proc->todo);
                  wake_up_interruptible(&node->proc->wait);
            }
      } else {
            if (hlist_empty(&node->refs) && !node->local_strong_refs &&
                !node->local_weak_refs) {
                  list_del_init(&node->work.entry);
                  if (node->proc) {
                        rb_erase(&node->rb_node, &node->proc->nodes);
                        if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                              printk(KERN_INFO "binder: refless node %d deleted\n", node->debug_id);
                  } else {
                        hlist_del(&node->dead_node);
                        if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                              printk(KERN_INFO "binder: dead node %d deleted\n", node->debug_id);
                  }
                  kfree(node);
                  binder_stats.obj_deleted[BINDER_STAT_NODE]++;
            }
      }

      return 0;
}


static struct binder_ref *binder_get_ref(struct binder_proc *proc,
                               uint32_t desc)
{
      struct rb_node *n = proc->refs_by_desc.rb_node;
      struct binder_ref *ref;

      while (n) {
            ref = rb_entry(n, struct binder_ref, rb_node_desc);

            if (desc < ref->desc)
                  n = n->rb_left;
            else if (desc > ref->desc)
                  n = n->rb_right;
            else
                  return ref;
      }
      return NULL;
}

static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
                                      struct binder_node *node)
{
      struct rb_node *n;
      struct rb_node **p = &proc->refs_by_node.rb_node;
      struct rb_node *parent = NULL;
      struct binder_ref *ref, *new_ref;

      while (*p) {
            parent = *p;
            ref = rb_entry(parent, struct binder_ref, rb_node_node);

            if (node < ref->node)
                  p = &(*p)->rb_left;
            else if (node > ref->node)
                  p = &(*p)->rb_right;
            else
                  return ref;
      }
      new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
      if (new_ref == NULL)
            return NULL;
      binder_stats.obj_created[BINDER_STAT_REF]++;
      new_ref->debug_id = ++binder_last_id;
      new_ref->proc = proc;
      new_ref->node = node;
      rb_link_node(&new_ref->rb_node_node, parent, p);
      rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);

      new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
      for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
            ref = rb_entry(n, struct binder_ref, rb_node_desc);
            if (ref->desc > new_ref->desc)
                  break;
            new_ref->desc = ref->desc + 1;
      }

      p = &proc->refs_by_desc.rb_node;
      while (*p) {
            parent = *p;
            ref = rb_entry(parent, struct binder_ref, rb_node_desc);

            if (new_ref->desc < ref->desc)
                  p = &(*p)->rb_left;
            else if (new_ref->desc > ref->desc)
                  p = &(*p)->rb_right;
            else
                  BUG();
      }
      rb_link_node(&new_ref->rb_node_desc, parent, p);
      rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
      if (node) {
            hlist_add_head(&new_ref->node_entry, &node->refs);
            if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                  printk(KERN_INFO "binder: %d new ref %d desc %d for "
                        "node %d\n", proc->pid, new_ref->debug_id,
                        new_ref->desc, node->debug_id);
      } else {
            if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                  printk(KERN_INFO "binder: %d new ref %d desc %d for "
                        "dead node\n", proc->pid, new_ref->debug_id,
                        new_ref->desc);
      }
      return new_ref;
}

static void binder_delete_ref(struct binder_ref *ref)
{
      if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
            printk(KERN_INFO "binder: %d delete ref %d desc %d for "
                  "node %d\n", ref->proc->pid, ref->debug_id,
                  ref->desc, ref->node->debug_id);
      rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
      rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
      if (ref->strong)
            binder_dec_node(ref->node, 1, 1);
      hlist_del(&ref->node_entry);
      binder_dec_node(ref->node, 0, 1);
      if (ref->death) {
            if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                  printk(KERN_INFO "binder: %d delete ref %d desc %d "
                        "has death notification\n", ref->proc->pid,
                        ref->debug_id, ref->desc);
            list_del(&ref->death->work.entry);
            kfree(ref->death);
            binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
      }
      kfree(ref);
      binder_stats.obj_deleted[BINDER_STAT_REF]++;
}

static int binder_inc_ref(struct binder_ref *ref, int strong,
                    struct list_head *target_list)
{
      int ret;
      if (strong) {
            if (ref->strong == 0) {
                  ret = binder_inc_node(ref->node, 1, 1, target_list);
                  if (ret)
                        return ret;
            }
            ref->strong++;
      } else {
            if (ref->weak == 0) {
                  ret = binder_inc_node(ref->node, 0, 1, target_list);
                  if (ret)
                        return ret;
            }
            ref->weak++;
      }
      return 0;
}


static int binder_dec_ref(struct binder_ref *ref, int strong)
{
      if (strong) {
            if (ref->strong == 0) {
                  binder_user_error("binder: %d invalid dec strong, "
                                "ref %d desc %d s %d w %d\n",
                                ref->proc->pid, ref->debug_id,
                                ref->desc, ref->strong, ref->weak);
                  return -EINVAL;
            }
            ref->strong--;
            if (ref->strong == 0) {
                  int ret;
                  ret = binder_dec_node(ref->node, strong, 1);
                  if (ret)
                        return ret;
            }
      } else {
            if (ref->weak == 0) {
                  binder_user_error("binder: %d invalid dec weak, "
                                "ref %d desc %d s %d w %d\n",
                                ref->proc->pid, ref->debug_id,
                                ref->desc, ref->strong, ref->weak);
                  return -EINVAL;
            }
            ref->weak--;
      }
      if (ref->strong == 0 && ref->weak == 0)
            binder_delete_ref(ref);
      return 0;
}

static void binder_pop_transaction(struct binder_thread *target_thread,
                           struct binder_transaction *t)
{
      if (target_thread) {
            BUG_ON(target_thread->transaction_stack != t);
            BUG_ON(target_thread->transaction_stack->from != target_thread);
            target_thread->transaction_stack =
                  target_thread->transaction_stack->from_parent;
            t->from = NULL;
      }
      t->need_reply = 0;
      if (t->buffer)
            t->buffer->transaction = NULL;
      kfree(t);
      binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
}

static void binder_send_failed_reply(struct binder_transaction *t,
                             uint32_t error_code)
{
      struct binder_thread *target_thread;
      BUG_ON(t->flags & TF_ONE_WAY);
      while (1) {
            target_thread = t->from;
            if (target_thread) {
                  if (target_thread->return_error != BR_OK &&
                     target_thread->return_error2 == BR_OK) {
                        target_thread->return_error2 =
                              target_thread->return_error;
                        target_thread->return_error = BR_OK;
                  }
                  if (target_thread->return_error == BR_OK) {
                        if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
                              printk(KERN_INFO "binder: send failed reply for transaction %d to %d:%d\n",
                                     t->debug_id, target_thread->proc->pid, target_thread->pid);

                        binder_pop_transaction(target_thread, t);
                        target_thread->return_error = error_code;
                        wake_up_interruptible(&target_thread->wait);
                  } else {
                        printk(KERN_ERR "binder: reply failed, target "
                              "thread, %d:%d, has error code %d "
                              "already\n", target_thread->proc->pid,
                              target_thread->pid,
                              target_thread->return_error);
                  }
                  return;
            } else {
                  struct binder_transaction *next = t->from_parent;

                  if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
                        printk(KERN_INFO "binder: send failed reply "
                              "for transaction %d, target dead\n",
                              t->debug_id);

                  binder_pop_transaction(target_thread, t);
                  if (next == NULL) {
                        if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                              printk(KERN_INFO "binder: reply failed,"
                                    " no target thread at root\n");
                        return;
                  }
                  t = next;
                  if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                        printk(KERN_INFO "binder: reply failed, no targ"
                              "et thread -- retry %d\n", t->debug_id);
            }
      }
}

static void binder_transaction_buffer_release(struct binder_proc *proc,
                                    struct binder_buffer *buffer,
                                    size_t *failed_at);

static void binder_transaction(struct binder_proc *proc,
                         struct binder_thread *thread,
                         struct binder_transaction_data *tr, int reply)
{
      struct binder_transaction *t;
      struct binder_work *tcomplete;
      size_t *offp, *off_end;
      struct binder_proc *target_proc;
      struct binder_thread *target_thread = NULL;
      struct binder_node *target_node = NULL;
      struct list_head *target_list;
      wait_queue_head_t *target_wait;
      struct binder_transaction *in_reply_to = NULL;
      struct binder_transaction_log_entry *e;
      uint32_t return_error;

      e = binder_transaction_log_add(&binder_transaction_log);
      e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
      e->from_proc = proc->pid;
      e->from_thread = thread->pid;
      e->target_handle = tr->target.handle;
      e->data_size = tr->data_size;
      e->offsets_size = tr->offsets_size;

      if (reply) {
            in_reply_to = thread->transaction_stack;
            if (in_reply_to == NULL) {
                  binder_user_error("binder: %d:%d got reply transaction "
                                "with no transaction stack\n",
                                proc->pid, thread->pid);
                  return_error = BR_FAILED_REPLY;
                  goto err_empty_call_stack;
            }
            binder_set_nice(in_reply_to->saved_priority);
            if (in_reply_to->to_thread != thread) {
                  binder_user_error("binder: %d:%d got reply transaction "
                        "with bad transaction stack,"
                        " transaction %d has target %d:%d\n",
                        proc->pid, thread->pid, in_reply_to->debug_id,
                        in_reply_to->to_proc ?
                        in_reply_to->to_proc->pid : 0,
                        in_reply_to->to_thread ?
                        in_reply_to->to_thread->pid : 0);
                  return_error = BR_FAILED_REPLY;
                  in_reply_to = NULL;
                  goto err_bad_call_stack;
            }
            thread->transaction_stack = in_reply_to->to_parent;
            target_thread = in_reply_to->from;
            if (target_thread == NULL) {
                  return_error = BR_DEAD_REPLY;
                  goto err_dead_binder;
            }
            if (target_thread->transaction_stack != in_reply_to) {
                  binder_user_error("binder: %d:%d got reply transaction "
                        "with bad target transaction stack %d, "
                        "expected %d\n",
                        proc->pid, thread->pid,
                        target_thread->transaction_stack ?
                        target_thread->transaction_stack->debug_id : 0,
                        in_reply_to->debug_id);
                  return_error = BR_FAILED_REPLY;
                  in_reply_to = NULL;
                  target_thread = NULL;
                  goto err_dead_binder;
            }
            target_proc = target_thread->proc;
      } else {
            if (tr->target.handle) {
                  struct binder_ref *ref;
                  ref = binder_get_ref(proc, tr->target.handle);
                  if (ref == NULL) {
                        binder_user_error("binder: %d:%d got "
                              "transaction to invalid handle\n",
                              proc->pid, thread->pid);
                        return_error = BR_FAILED_REPLY;
                        goto err_invalid_target_handle;
                  }
                  target_node = ref->node;
            } else {
                  target_node = binder_context_mgr_node;
                  if (target_node == NULL) {
                        return_error = BR_DEAD_REPLY;
                        goto err_no_context_mgr_node;
                  }
            }
            e->to_node = target_node->debug_id;
            target_proc = target_node->proc;
            if (target_proc == NULL) {
                  return_error = BR_DEAD_REPLY;
                  goto err_dead_binder;
            }
            if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
                  struct binder_transaction *tmp;
                  tmp = thread->transaction_stack;
                  if (tmp->to_thread != thread) {
                        binder_user_error("binder: %d:%d got new "
                              "transaction with bad transaction stack"
                              ", transaction %d has target %d:%d\n",
                              proc->pid, thread->pid, tmp->debug_id,
                              tmp->to_proc ? tmp->to_proc->pid : 0,
                              tmp->to_thread ?
                              tmp->to_thread->pid : 0);
                        return_error = BR_FAILED_REPLY;
                        goto err_bad_call_stack;
                  }
                  while (tmp) {
                        if (tmp->from && tmp->from->proc == target_proc)
                              target_thread = tmp->from;
                        tmp = tmp->from_parent;
                  }
            }
      }
      if (target_thread) {
            e->to_thread = target_thread->pid;
            target_list = &target_thread->todo;
            target_wait = &target_thread->wait;
      } else {
            target_list = &target_proc->todo;
            target_wait = &target_proc->wait;
      }
      e->to_proc = target_proc->pid;

      /* TODO: reuse incoming transaction for reply */
      t = kzalloc(sizeof(*t), GFP_KERNEL);
      if (t == NULL) {
            return_error = BR_FAILED_REPLY;
            goto err_alloc_t_failed;
      }
      binder_stats.obj_created[BINDER_STAT_TRANSACTION]++;

      tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
      if (tcomplete == NULL) {
            return_error = BR_FAILED_REPLY;
            goto err_alloc_tcomplete_failed;
      }
      binder_stats.obj_created[BINDER_STAT_TRANSACTION_COMPLETE]++;

      t->debug_id = ++binder_last_id;
      e->debug_id = t->debug_id;

      if (binder_debug_mask & BINDER_DEBUG_TRANSACTION) {
            if (reply)
                  printk(KERN_INFO "binder: %d:%d BC_REPLY %d -> %d:%d, "
                         "data %p-%p size %zd-%zd\n",
                         proc->pid, thread->pid, t->debug_id,
                         target_proc->pid, target_thread->pid,
                         tr->data.ptr.buffer, tr->data.ptr.offsets,
                         tr->data_size, tr->offsets_size);
            else
                  printk(KERN_INFO "binder: %d:%d BC_TRANSACTION %d -> "
                         "%d - node %d, data %p-%p size %zd-%zd\n",
                         proc->pid, thread->pid, t->debug_id,
                         target_proc->pid, target_node->debug_id,
                         tr->data.ptr.buffer, tr->data.ptr.offsets,
                         tr->data_size, tr->offsets_size);
      }

      if (!reply && !(tr->flags & TF_ONE_WAY))
            t->from = thread;
      else
            t->from = NULL;
      t->sender_euid = proc->tsk->cred->euid;
      t->to_proc = target_proc;
      t->to_thread = target_thread;
      t->code = tr->code;
      t->flags = tr->flags;
      t->priority = task_nice(current);
      t->buffer = binder_alloc_buf(target_proc, tr->data_size,
            tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
      if (t->buffer == NULL) {
            return_error = BR_FAILED_REPLY;
            goto err_binder_alloc_buf_failed;
      }
      t->buffer->allow_user_free = 0;
      t->buffer->debug_id = t->debug_id;
      t->buffer->transaction = t;
      t->buffer->target_node = target_node;
      if (target_node)
            binder_inc_node(target_node, 1, 0, NULL);

      offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));

      if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
            binder_user_error("binder: %d:%d got transaction with invalid "
                  "data ptr\n", proc->pid, thread->pid);
            return_error = BR_FAILED_REPLY;
            goto err_copy_data_failed;
      }
      if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
            binder_user_error("binder: %d:%d got transaction with invalid "
                  "offsets ptr\n", proc->pid, thread->pid);
            return_error = BR_FAILED_REPLY;
            goto err_copy_data_failed;
      }
      if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
            binder_user_error("binder: %d:%d got transaction with "
                  "invalid offsets size, %zd\n",
                  proc->pid, thread->pid, tr->offsets_size);
            return_error = BR_FAILED_REPLY;
            goto err_bad_offset;
      }
      off_end = (void *)offp + tr->offsets_size;
      for (; offp < off_end; offp++) {
            struct flat_binder_object *fp;
            if (*offp > t->buffer->data_size - sizeof(*fp) ||
                t->buffer->data_size < sizeof(*fp) ||
                !IS_ALIGNED(*offp, sizeof(void *))) {
                  binder_user_error("binder: %d:%d got transaction with "
                        "invalid offset, %zd\n",
                        proc->pid, thread->pid, *offp);
                  return_error = BR_FAILED_REPLY;
                  goto err_bad_offset;
            }
            fp = (struct flat_binder_object *)(t->buffer->data + *offp);
            switch (fp->type) {
            case BINDER_TYPE_BINDER:
            case BINDER_TYPE_WEAK_BINDER: {
                  struct binder_ref *ref;
                  struct binder_node *node = binder_get_node(proc, fp->binder);
                  if (node == NULL) {
                        node = binder_new_node(proc, fp->binder, fp->cookie);
                        if (node == NULL) {
                              return_error = BR_FAILED_REPLY;
                              goto err_binder_new_node_failed;
                        }
                        node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
                        node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
                  }
                  if (fp->cookie != node->cookie) {
                        binder_user_error("binder: %d:%d sending u%p "
                              "node %d, cookie mismatch %p != %p\n",
                              proc->pid, thread->pid,
                              fp->binder, node->debug_id,
                              fp->cookie, node->cookie);
                        goto err_binder_get_ref_for_node_failed;
                  }
                  ref = binder_get_ref_for_node(target_proc, node);
                  if (ref == NULL) {
                        return_error = BR_FAILED_REPLY;
                        goto err_binder_get_ref_for_node_failed;
                  }
                  if (fp->type == BINDER_TYPE_BINDER)
                        fp->type = BINDER_TYPE_HANDLE;
                  else
                        fp->type = BINDER_TYPE_WEAK_HANDLE;
                  fp->handle = ref->desc;
                  binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE, &thread->todo);
                  if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                        printk(KERN_INFO "        node %d u%p -> ref %d desc %d\n",
                               node->debug_id, node->ptr, ref->debug_id, ref->desc);
            } break;
            case BINDER_TYPE_HANDLE:
            case BINDER_TYPE_WEAK_HANDLE: {
                  struct binder_ref *ref = binder_get_ref(proc, fp->handle);
                  if (ref == NULL) {
                        binder_user_error("binder: %d:%d got "
                              "transaction with invalid "
                              "handle, %ld\n", proc->pid,
                              thread->pid, fp->handle);
                        return_error = BR_FAILED_REPLY;
                        goto err_binder_get_ref_failed;
                  }
                  if (ref->node->proc == target_proc) {
                        if (fp->type == BINDER_TYPE_HANDLE)
                              fp->type = BINDER_TYPE_BINDER;
                        else
                              fp->type = BINDER_TYPE_WEAK_BINDER;
                        fp->binder = ref->node->ptr;
                        fp->cookie = ref->node->cookie;
                        binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
                        if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                              printk(KERN_INFO "        ref %d desc %d -> node %d u%p\n",
                                     ref->debug_id, ref->desc, ref->node->debug_id, ref->node->ptr);
                  } else {
                        struct binder_ref *new_ref;
                        new_ref = binder_get_ref_for_node(target_proc, ref->node);
                        if (new_ref == NULL) {
                              return_error = BR_FAILED_REPLY;
                              goto err_binder_get_ref_for_node_failed;
                        }
                        fp->handle = new_ref->desc;
                        binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
                        if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                              printk(KERN_INFO "        ref %d desc %d -> ref %d desc %d (node %d)\n",
                                     ref->debug_id, ref->desc, new_ref->debug_id, new_ref->desc, ref->node->debug_id);
                  }
            } break;

            case BINDER_TYPE_FD: {
                  int target_fd;
                  struct file *file;

                  if (reply) {
                        if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
                              binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
                                    proc->pid, thread->pid, fp->handle);
                              return_error = BR_FAILED_REPLY;
                              goto err_fd_not_allowed;
                        }
                  } else if (!target_node->accept_fds) {
                        binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
                              proc->pid, thread->pid, fp->handle);
                        return_error = BR_FAILED_REPLY;
                        goto err_fd_not_allowed;
                  }

                  file = fget(fp->handle);
                  if (file == NULL) {
                        binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
                              proc->pid, thread->pid, fp->handle);
                        return_error = BR_FAILED_REPLY;
                        goto err_fget_failed;
                  }
                  target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
                  if (target_fd < 0) {
                        fput(file);
                        return_error = BR_FAILED_REPLY;
                        goto err_get_unused_fd_failed;
                  }
                  task_fd_install(target_proc, target_fd, file);
                  if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                        printk(KERN_INFO "        fd %ld -> %d\n", fp->handle, target_fd);
                  /* TODO: fput? */
                  fp->handle = target_fd;
            } break;

            default:
                  binder_user_error("binder: %d:%d got transactio"
                        "n with invalid object type, %lx\n",
                        proc->pid, thread->pid, fp->type);
                  return_error = BR_FAILED_REPLY;
                  goto err_bad_object_type;
            }
      }
      if (reply) {
            BUG_ON(t->buffer->async_transaction != 0);
            binder_pop_transaction(target_thread, in_reply_to);
      } else if (!(t->flags & TF_ONE_WAY)) {
            BUG_ON(t->buffer->async_transaction != 0);
            t->need_reply = 1;
            t->from_parent = thread->transaction_stack;
            thread->transaction_stack = t;
      } else {
            BUG_ON(target_node == NULL);
            BUG_ON(t->buffer->async_transaction != 1);
            if (target_node->has_async_transaction) {
                  target_list = &target_node->async_todo;
                  target_wait = NULL;
            } else
                  target_node->has_async_transaction = 1;
      }
      t->work.type = BINDER_WORK_TRANSACTION;
      list_add_tail(&t->work.entry, target_list);
      tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
      list_add_tail(&tcomplete->entry, &thread->todo);
      if (target_wait)
            wake_up_interruptible(target_wait);
      return;

err_get_unused_fd_failed:
err_fget_failed:
err_fd_not_allowed:
err_binder_get_ref_for_node_failed:
err_binder_get_ref_failed:
err_binder_new_node_failed:
err_bad_object_type:
err_bad_offset:
err_copy_data_failed:
      binder_transaction_buffer_release(target_proc, t->buffer, offp);
      t->buffer->transaction = NULL;
      binder_free_buf(target_proc, t->buffer);
err_binder_alloc_buf_failed:
      kfree(tcomplete);
      binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
err_alloc_tcomplete_failed:
      kfree(t);
      binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
err_alloc_t_failed:
err_bad_call_stack:
err_empty_call_stack:
err_dead_binder:
err_invalid_target_handle:
err_no_context_mgr_node:
      if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
            printk(KERN_INFO "binder: %d:%d transaction failed %d, size"
                        "%zd-%zd\n",
                     proc->pid, thread->pid, return_error,
                     tr->data_size, tr->offsets_size);

      {
            struct binder_transaction_log_entry *fe;
            fe = binder_transaction_log_add(&binder_transaction_log_failed);
            *fe = *e;
      }

      BUG_ON(thread->return_error != BR_OK);
      if (in_reply_to) {
            thread->return_error = BR_TRANSACTION_COMPLETE;
            binder_send_failed_reply(in_reply_to, return_error);
      } else
            thread->return_error = return_error;
}

static void binder_transaction_buffer_release(struct binder_proc *proc,
                                    struct binder_buffer *buffer,
                                    size_t *failed_at)
{
      size_t *offp, *off_end;
      int debug_id = buffer->debug_id;

      if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
            printk(KERN_INFO "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
                     proc->pid, buffer->debug_id,
                     buffer->data_size, buffer->offsets_size, failed_at);

      if (buffer->target_node)
            binder_dec_node(buffer->target_node, 1, 0);

      offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
      if (failed_at)
            off_end = failed_at;
      else
            off_end = (void *)offp + buffer->offsets_size;
      for (; offp < off_end; offp++) {
            struct flat_binder_object *fp;
            if (*offp > buffer->data_size - sizeof(*fp) ||
                buffer->data_size < sizeof(*fp) ||
                !IS_ALIGNED(*offp, sizeof(void *))) {
                  printk(KERN_ERR "binder: transaction release %d bad"
                              "offset %zd, size %zd\n", debug_id, *offp, buffer->data_size);
                  continue;
            }
            fp = (struct flat_binder_object *)(buffer->data + *offp);
            switch (fp->type) {
            case BINDER_TYPE_BINDER:
            case BINDER_TYPE_WEAK_BINDER: {
                  struct binder_node *node = binder_get_node(proc, fp->binder);
                  if (node == NULL) {
                        printk(KERN_ERR "binder: transaction release %d bad node %p\n", debug_id, fp->binder);
                        break;
                  }
                  if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                        printk(KERN_INFO "        node %d u%p\n",
                               node->debug_id, node->ptr);
                  binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
            } break;
            case BINDER_TYPE_HANDLE:
            case BINDER_TYPE_WEAK_HANDLE: {
                  struct binder_ref *ref = binder_get_ref(proc, fp->handle);
                  if (ref == NULL) {
                        printk(KERN_ERR "binder: transaction release %d bad handle %ld\n", debug_id, fp->handle);
                        break;
                  }
                  if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                        printk(KERN_INFO "        ref %d desc %d (node %d)\n",
                               ref->debug_id, ref->desc, ref->node->debug_id);
                  binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
            } break;

            case BINDER_TYPE_FD:
                  if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                        printk(KERN_INFO "        fd %ld\n", fp->handle);
                  if (failed_at)
                        task_close_fd(proc, fp->handle);
                  break;

            default:
                  printk(KERN_ERR "binder: transaction release %d bad object type %lx\n", debug_id, fp->type);
                  break;
            }
      }
}

int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
                  void __user *buffer, int size, signed long *consumed)
{
      uint32_t cmd;
      void __user *ptr = buffer + *consumed;
      void __user *end = buffer + size;

      while (ptr < end && thread->return_error == BR_OK) {
            if (get_user(cmd, (uint32_t __user *)ptr))
                  return -EFAULT;
            ptr += sizeof(uint32_t);
            if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
                  binder_stats.bc[_IOC_NR(cmd)]++;
                  proc->stats.bc[_IOC_NR(cmd)]++;
                  thread->stats.bc[_IOC_NR(cmd)]++;
            }
            switch (cmd) {
            case BC_INCREFS:
            case BC_ACQUIRE:
            case BC_RELEASE:
            case BC_DECREFS: {
                  uint32_t target;
                  struct binder_ref *ref;
                  const char *debug_string;

                  if (get_user(target, (uint32_t __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(uint32_t);
                  if (target == 0 && binder_context_mgr_node &&
                      (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
                        ref = binder_get_ref_for_node(proc,
                                     binder_context_mgr_node);
                        if (ref->desc != target) {
                              binder_user_error("binder: %d:"
                                    "%d tried to acquire "
                                    "reference to desc 0, "
                                    "got %d instead\n",
                                    proc->pid, thread->pid,
                                    ref->desc);
                        }
                  } else
                        ref = binder_get_ref(proc, target);
                  if (ref == NULL) {
                        binder_user_error("binder: %d:%d refcou"
                              "nt change on invalid ref %d\n",
                              proc->pid, thread->pid, target);
                        break;
                  }
                  switch (cmd) {
                  case BC_INCREFS:
                        debug_string = "IncRefs";
                        binder_inc_ref(ref, 0, NULL);
                        break;
                  case BC_ACQUIRE:
                        debug_string = "Acquire";
                        binder_inc_ref(ref, 1, NULL);
                        break;
                  case BC_RELEASE:
                        debug_string = "Release";
                        binder_dec_ref(ref, 1);
                        break;
                  case BC_DECREFS:
                  default:
                        debug_string = "DecRefs";
                        binder_dec_ref(ref, 0);
                        break;
                  }
                  if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
                        printk(KERN_INFO "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
                               proc->pid, thread->pid, debug_string, ref->debug_id, ref->desc, ref->strong, ref->weak, ref->node->debug_id);
                  break;
            }
            case BC_INCREFS_DONE:
            case BC_ACQUIRE_DONE: {
                  void __user *node_ptr;
                  void *cookie;
                  struct binder_node *node;

                  if (get_user(node_ptr, (void * __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(void *);
                  if (get_user(cookie, (void * __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(void *);
                  node = binder_get_node(proc, node_ptr);
                  if (node == NULL) {
                        binder_user_error("binder: %d:%d "
                              "%s u%p no match\n",
                              proc->pid, thread->pid,
                              cmd == BC_INCREFS_DONE ?
                              "BC_INCREFS_DONE" :
                              "BC_ACQUIRE_DONE",
                              node_ptr);
                        break;
                  }
                  if (cookie != node->cookie) {
                        binder_user_error("binder: %d:%d %s u%p node %d"
                              " cookie mismatch %p != %p\n",
                              proc->pid, thread->pid,
                              cmd == BC_INCREFS_DONE ?
                              "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
                              node_ptr, node->debug_id,
                              cookie, node->cookie);
                        break;
                  }
                  if (cmd == BC_ACQUIRE_DONE) {
                        if (node->pending_strong_ref == 0) {
                              binder_user_error("binder: %d:%d "
                                    "BC_ACQUIRE_DONE node %d has "
                                    "no pending acquire request\n",
                                    proc->pid, thread->pid,
                                    node->debug_id);
                              break;
                        }
                        node->pending_strong_ref = 0;
                  } else {
                        if (node->pending_weak_ref == 0) {
                              binder_user_error("binder: %d:%d "
                                    "BC_INCREFS_DONE node %d has "
                                    "no pending increfs request\n",
                                    proc->pid, thread->pid,
                                    node->debug_id);
                              break;
                        }
                        node->pending_weak_ref = 0;
                  }
                  binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
                  if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
                        printk(KERN_INFO "binder: %d:%d %s node %d ls %d lw %d\n",
                               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);
                  break;
            }
            case BC_ATTEMPT_ACQUIRE:
                  printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported\n");
                  return -EINVAL;
            case BC_ACQUIRE_RESULT:
                  printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported\n");
                  return -EINVAL;

            case BC_FREE_BUFFER: {
                  void __user *data_ptr;
                  struct binder_buffer *buffer;

                  if (get_user(data_ptr, (void * __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(void *);

                  buffer = binder_buffer_lookup(proc, data_ptr);
                  if (buffer == NULL) {
                        binder_user_error("binder: %d:%d "
                              "BC_FREE_BUFFER u%p no match\n",
                              proc->pid, thread->pid, data_ptr);
                        break;
                  }
                  if (!buffer->allow_user_free) {
                        binder_user_error("binder: %d:%d "
                              "BC_FREE_BUFFER u%p matched "
                              "unreturned buffer\n",
                              proc->pid, thread->pid, data_ptr);
                        break;
                  }
                  if (binder_debug_mask & BINDER_DEBUG_FREE_BUFFER)
                        printk(KERN_INFO "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
                               proc->pid, thread->pid, data_ptr, buffer->debug_id,
                               buffer->transaction ? "active" : "finished");

                  if (buffer->transaction) {
                        buffer->transaction->buffer = NULL;
                        buffer->transaction = NULL;
                  }
                  if (buffer->async_transaction && buffer->target_node) {
                        BUG_ON(!buffer->target_node->has_async_transaction);
                        if (list_empty(&buffer->target_node->async_todo))
                              buffer->target_node->has_async_transaction = 0;
                        else
                              list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
                  }
                  binder_transaction_buffer_release(proc, buffer, NULL);
                  binder_free_buf(proc, buffer);
                  break;
            }

            case BC_TRANSACTION:
            case BC_REPLY: {
                  struct binder_transaction_data tr;

                  if (copy_from_user(&tr, ptr, sizeof(tr)))
                        return -EFAULT;
                  ptr += sizeof(tr);
                  binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
                  break;
            }

            case BC_REGISTER_LOOPER:
                  if (binder_debug_mask & BINDER_DEBUG_THREADS)
                        printk(KERN_INFO "binder: %d:%d BC_REGISTER_LOOPER\n",
                               proc->pid, thread->pid);
                  if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
                        thread->looper |= BINDER_LOOPER_STATE_INVALID;
                        binder_user_error("binder: %d:%d ERROR:"
                              " BC_REGISTER_LOOPER called "
                              "after BC_ENTER_LOOPER\n",
                              proc->pid, thread->pid);
                  } else if (proc->requested_threads == 0) {
                        thread->looper |= BINDER_LOOPER_STATE_INVALID;
                        binder_user_error("binder: %d:%d ERROR:"
                              " BC_REGISTER_LOOPER called "
                              "without request\n",
                              proc->pid, thread->pid);
                  } else {
                        proc->requested_threads--;
                        proc->requested_threads_started++;
                  }
                  thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
                  break;
            case BC_ENTER_LOOPER:
                  if (binder_debug_mask & BINDER_DEBUG_THREADS)
                        printk(KERN_INFO "binder: %d:%d BC_ENTER_LOOPER\n",
                               proc->pid, thread->pid);
                  if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
                        thread->looper |= BINDER_LOOPER_STATE_INVALID;
                        binder_user_error("binder: %d:%d ERROR:"
                              " BC_ENTER_LOOPER called after "
                              "BC_REGISTER_LOOPER\n",
                              proc->pid, thread->pid);
                  }
                  thread->looper |= BINDER_LOOPER_STATE_ENTERED;
                  break;
            case BC_EXIT_LOOPER:
                  if (binder_debug_mask & BINDER_DEBUG_THREADS)
                        printk(KERN_INFO "binder: %d:%d BC_EXIT_LOOPER\n",
                               proc->pid, thread->pid);
                  thread->looper |= BINDER_LOOPER_STATE_EXITED;
                  break;

            case BC_REQUEST_DEATH_NOTIFICATION:
            case BC_CLEAR_DEATH_NOTIFICATION: {
                  uint32_t target;
                  void __user *cookie;
                  struct binder_ref *ref;
                  struct binder_ref_death *death;

                  if (get_user(target, (uint32_t __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(uint32_t);
                  if (get_user(cookie, (void __user * __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(void *);
                  ref = binder_get_ref(proc, target);
                  if (ref == NULL) {
                        binder_user_error("binder: %d:%d %s "
                              "invalid ref %d\n",
                              proc->pid, thread->pid,
                              cmd == BC_REQUEST_DEATH_NOTIFICATION ?
                              "BC_REQUEST_DEATH_NOTIFICATION" :
                              "BC_CLEAR_DEATH_NOTIFICATION",
                              target);
                        break;
                  }

                  if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
                        printk(KERN_INFO "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
                               proc->pid, thread->pid,
                               cmd == BC_REQUEST_DEATH_NOTIFICATION ?
                               "BC_REQUEST_DEATH_NOTIFICATION" :
                               "BC_CLEAR_DEATH_NOTIFICATION",
                               cookie, ref->debug_id, ref->desc,
                               ref->strong, ref->weak, ref->node->debug_id);

                  if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
                        if (ref->death) {
                              binder_user_error("binder: %d:%"
                                    "d BC_REQUEST_DEATH_NOTI"
                                    "FICATION death notific"
                                    "ation already set\n",
                                    proc->pid, thread->pid);
                              break;
                        }
                        death = kzalloc(sizeof(*death), GFP_KERNEL);
                        if (death == NULL) {
                              thread->return_error = BR_ERROR;
                              if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
                                    printk(KERN_INFO "binder: %d:%d "
                                          "BC_REQUEST_DEATH_NOTIFICATION failed\n",
                                          proc->pid, thread->pid);
                              break;
                        }
                        binder_stats.obj_created[BINDER_STAT_DEATH]++;
                        INIT_LIST_HEAD(&death->work.entry);
                        death->cookie = cookie;
                        ref->death = death;
                        if (ref->node->proc == NULL) {
                              ref->death->work.type = BINDER_WORK_DEAD_BINDER;
                              if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
                                    list_add_tail(&ref->death->work.entry, &thread->todo);
                              } else {
                                    list_add_tail(&ref->death->work.entry, &proc->todo);
                                    wake_up_interruptible(&proc->wait);
                              }
                        }
                  } else {
                        if (ref->death == NULL) {
                              binder_user_error("binder: %d:%"
                                    "d BC_CLEAR_DEATH_NOTIFI"
                                    "CATION death notificat"
                                    "ion not active\n",
                                    proc->pid, thread->pid);
                              break;
                        }
                        death = ref->death;
                        if (death->cookie != cookie) {
                              binder_user_error("binder: %d:%"
                                    "d BC_CLEAR_DEATH_NOTIFI"
                                    "CATION death notificat"
                                    "ion cookie mismatch "
                                    "%p != %p\n",
                                    proc->pid, thread->pid,
                                    death->cookie, cookie);
                              break;
                        }
                        ref->death = NULL;
                        if (list_empty(&death->work.entry)) {
                              death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
                              if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
                                    list_add_tail(&death->work.entry, &thread->todo);
                              } else {
                                    list_add_tail(&death->work.entry, &proc->todo);
                                    wake_up_interruptible(&proc->wait);
                              }
                        } else {
                              BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
                              death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
                        }
                  }
            } break;
            case BC_DEAD_BINDER_DONE: {
                  struct binder_work *w;
                  void __user *cookie;
                  struct binder_ref_death *death = NULL;
                  if (get_user(cookie, (void __user * __user *)ptr))
                        return -EFAULT;

                  ptr += sizeof(void *);
                  list_for_each_entry(w, &proc->delivered_death, entry) {
                        struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
                        if (tmp_death->cookie == cookie) {
                              death = tmp_death;
                              break;
                        }
                  }
                  if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                        printk(KERN_INFO "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
                               proc->pid, thread->pid, cookie, death);
                  if (death == NULL) {
                        binder_user_error("binder: %d:%d BC_DEAD"
                              "_BINDER_DONE %p not found\n",
                              proc->pid, thread->pid, cookie);
                        break;
                  }

                  list_del_init(&death->work.entry);
                  if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
                        death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
                        if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
                              list_add_tail(&death->work.entry, &thread->todo);
                        } else {
                              list_add_tail(&death->work.entry, &proc->todo);
                              wake_up_interruptible(&proc->wait);
                        }
                  }
            } break;

            default:
                  printk(KERN_ERR "binder: %d:%d unknown command %d\n",
                         proc->pid, thread->pid, cmd);
                  return -EINVAL;
            }
            *consumed = ptr - buffer;
      }
      return 0;
}

void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
                uint32_t cmd)
{
      if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
            binder_stats.br[_IOC_NR(cmd)]++;
            proc->stats.br[_IOC_NR(cmd)]++;
            thread->stats.br[_IOC_NR(cmd)]++;
      }
}

static int binder_has_proc_work(struct binder_proc *proc,
                        struct binder_thread *thread)
{
      return !list_empty(&proc->todo) ||
            (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
}

static int binder_has_thread_work(struct binder_thread *thread)
{
      return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
            (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
}

static int binder_thread_read(struct binder_proc *proc,
                        struct binder_thread *thread,
                        void  __user *buffer, int size,
                        signed long *consumed, int non_block)
{
      void __user *ptr = buffer + *consumed;
      void __user *end = buffer + size;

      int ret = 0;
      int wait_for_proc_work;

      if (*consumed == 0) {
            if (put_user(BR_NOOP, (uint32_t __user *)ptr))
                  return -EFAULT;
            ptr += sizeof(uint32_t);
      }

retry:
      wait_for_proc_work = thread->transaction_stack == NULL &&
                        list_empty(&thread->todo);

      if (thread->return_error != BR_OK && ptr < end) {
            if (thread->return_error2 != BR_OK) {
                  if (put_user(thread->return_error2, (uint32_t __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(uint32_t);
                  if (ptr == end)
                        goto done;
                  thread->return_error2 = BR_OK;
            }
            if (put_user(thread->return_error, (uint32_t __user *)ptr))
                  return -EFAULT;
            ptr += sizeof(uint32_t);
            thread->return_error = BR_OK;
            goto done;
      }


      thread->looper |= BINDER_LOOPER_STATE_WAITING;
      if (wait_for_proc_work)
            proc->ready_threads++;
      mutex_unlock(&binder_lock);
      if (wait_for_proc_work) {
            if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
                              BINDER_LOOPER_STATE_ENTERED))) {
                  binder_user_error("binder: %d:%d ERROR: Thread waiting "
                        "for process work before calling BC_REGISTER_"
                        "LOOPER or BC_ENTER_LOOPER (state %x)\n",
                        proc->pid, thread->pid, thread->looper);
                  wait_event_interruptible(binder_user_error_wait,
                                     binder_stop_on_user_error < 2);
            }
            binder_set_nice(proc->default_priority);
            if (non_block) {
                  if (!binder_has_proc_work(proc, thread))
                        ret = -EAGAIN;
            } else
                  ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
      } else {
            if (non_block) {
                  if (!binder_has_thread_work(thread))
                        ret = -EAGAIN;
            } else
                  ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
      }
      mutex_lock(&binder_lock);
      if (wait_for_proc_work)
            proc->ready_threads--;
      thread->looper &= ~BINDER_LOOPER_STATE_WAITING;

      if (ret)
            return ret;

      while (1) {
            uint32_t cmd;
            struct binder_transaction_data tr;
            struct binder_work *w;
            struct binder_transaction *t = NULL;

            if (!list_empty(&thread->todo))
                  w = list_first_entry(&thread->todo, struct binder_work, entry);
            else if (!list_empty(&proc->todo) && wait_for_proc_work)
                  w = list_first_entry(&proc->todo, struct binder_work, entry);
            else {
                  if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
                        goto retry;
                  break;
            }

            if (end - ptr < sizeof(tr) + 4)
                  break;

            switch (w->type) {
            case BINDER_WORK_TRANSACTION: {
                  t = container_of(w, struct binder_transaction, work);
            } break;
            case BINDER_WORK_TRANSACTION_COMPLETE: {
                  cmd = BR_TRANSACTION_COMPLETE;
                  if (put_user(cmd, (uint32_t __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(uint32_t);

                  binder_stat_br(proc, thread, cmd);
                  if (binder_debug_mask & BINDER_DEBUG_TRANSACTION_COMPLETE)
                        printk(KERN_INFO "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
                               proc->pid, thread->pid);

                  list_del(&w->entry);
                  kfree(w);
                  binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
            } break;
            case BINDER_WORK_NODE: {
                  struct binder_node *node = container_of(w, struct binder_node, work);
                  uint32_t cmd = BR_NOOP;
                  const char *cmd_name;
                  int strong = node->internal_strong_refs || node->local_strong_refs;
                  int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
                  if (weak && !node->has_weak_ref) {
                        cmd = BR_INCREFS;
                        cmd_name = "BR_INCREFS";
                        node->has_weak_ref = 1;
                        node->pending_weak_ref = 1;
                        node->local_weak_refs++;
                  } else if (strong && !node->has_strong_ref) {
                        cmd = BR_ACQUIRE;
                        cmd_name = "BR_ACQUIRE";
                        node->has_strong_ref = 1;
                        node->pending_strong_ref = 1;
                        node->local_strong_refs++;
                  } else if (!strong && node->has_strong_ref) {
                        cmd = BR_RELEASE;
                        cmd_name = "BR_RELEASE";
                        node->has_strong_ref = 0;
                  } else if (!weak && node->has_weak_ref) {
                        cmd = BR_DECREFS;
                        cmd_name = "BR_DECREFS";
                        node->has_weak_ref = 0;
                  }
                  if (cmd != BR_NOOP) {
                        if (put_user(cmd, (uint32_t __user *)ptr))
                              return -EFAULT;
                        ptr += sizeof(uint32_t);
                        if (put_user(node->ptr, (void * __user *)ptr))
                              return -EFAULT;
                        ptr += sizeof(void *);
                        if (put_user(node->cookie, (void * __user *)ptr))
                              return -EFAULT;
                        ptr += sizeof(void *);

                        binder_stat_br(proc, thread, cmd);
                        if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
                              printk(KERN_INFO "binder: %d:%d %s %d u%p c%p\n",
                                     proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
                  } else {
                        list_del_init(&w->entry);
                        if (!weak && !strong) {
                              if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                                    printk(KERN_INFO "binder: %d:%d node %d u%p c%p deleted\n",
                                           proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
                              rb_erase(&node->rb_node, &proc->nodes);
                              kfree(node);
                              binder_stats.obj_deleted[BINDER_STAT_NODE]++;
                        } else {
                              if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                                    printk(KERN_INFO "binder: %d:%d node %d u%p c%p state unchanged\n",
                                           proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
                        }
                  }
            } break;
            case BINDER_WORK_DEAD_BINDER:
            case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
            case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
                  struct binder_ref_death *death;
                  uint32_t cmd;

                  death = container_of(w, struct binder_ref_death, work);
                  if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
                        cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
                  else
                        cmd = BR_DEAD_BINDER;
                  if (put_user(cmd, (uint32_t __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(uint32_t);
                  if (put_user(death->cookie, (void * __user *)ptr))
                        return -EFAULT;
                  ptr += sizeof(void *);
                  if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
                        printk(KERN_INFO "binder: %d:%d %s %p\n",
                               proc->pid, thread->pid,
                               cmd == BR_DEAD_BINDER ?
                               "BR_DEAD_BINDER" :
                               "BR_CLEAR_DEATH_NOTIFICATION_DONE",
                               death->cookie);

                  if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
                        list_del(&w->entry);
                        kfree(death);
                        binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
                  } else
                        list_move(&w->entry, &proc->delivered_death);
                  if (cmd == BR_DEAD_BINDER)
                        goto done; /* DEAD_BINDER notifications can cause transactions */
            } break;
            }

            if (!t)
                  continue;

            BUG_ON(t->buffer == NULL);
            if (t->buffer->target_node) {
                  struct binder_node *target_node = t->buffer->target_node;
                  tr.target.ptr = target_node->ptr;
                  tr.cookie =  target_node->cookie;
                  t->saved_priority = task_nice(current);
                  if (t->priority < target_node->min_priority &&
                      !(t->flags & TF_ONE_WAY))
                        binder_set_nice(t->priority);
                  else if (!(t->flags & TF_ONE_WAY) ||
                         t->saved_priority > target_node->min_priority)
                        binder_set_nice(target_node->min_priority);
                  cmd = BR_TRANSACTION;
            } else {
                  tr.target.ptr = NULL;
                  tr.cookie = NULL;
                  cmd = BR_REPLY;
            }
            tr.code = t->code;
            tr.flags = t->flags;
            tr.sender_euid = t->sender_euid;

            if (t->from) {
                  struct task_struct *sender = t->from->proc->tsk;
                  tr.sender_pid = task_tgid_nr_ns(sender,
                                          current->nsproxy->pid_ns);
            } else {
                  tr.sender_pid = 0;
            }

            tr.data_size = t->buffer->data_size;
            tr.offsets_size = t->buffer->offsets_size;
            tr.data.ptr.buffer = (void *)t->buffer->data +
                              proc->user_buffer_offset;
            tr.data.ptr.offsets = tr.data.ptr.buffer +
                              ALIGN(t->buffer->data_size,
                                  sizeof(void *));

            if (put_user(cmd, (uint32_t __user *)ptr))
                  return -EFAULT;
            ptr += sizeof(uint32_t);
            if (copy_to_user(ptr, &tr, sizeof(tr)))
                  return -EFAULT;
            ptr += sizeof(tr);

            binder_stat_br(proc, thread, cmd);
            if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                  printk(KERN_INFO "binder: %d:%d %s %d %d:%d, cmd %d"
                        "size %zd-%zd ptr %p-%p\n",
                         proc->pid, thread->pid,
                         (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
                                           "BR_REPLY",
                         t->debug_id, t->from ? t->from->proc->pid : 0,
                         t->from ? t->from->pid : 0, cmd,
                         t->buffer->data_size, t->buffer->offsets_size,
                         tr.data.ptr.buffer, tr.data.ptr.offsets);

            list_del(&t->work.entry);
            t->buffer->allow_user_free = 1;
            if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
                  t->to_parent = thread->transaction_stack;
                  t->to_thread = thread;
                  thread->transaction_stack = t;
            } else {
                  t->buffer->transaction = NULL;
                  kfree(t);
                  binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
            }
            break;
      }

done:

      *consumed = ptr - buffer;
      if (proc->requested_threads + proc->ready_threads == 0 &&
          proc->requested_threads_started < proc->max_threads &&
          (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
           BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
           /*spawn a new thread if we leave this out */) {
            proc->requested_threads++;
            if (binder_debug_mask & BINDER_DEBUG_THREADS)
                  printk(KERN_INFO "binder: %d:%d BR_SPAWN_LOOPER\n",
                         proc->pid, thread->pid);
            if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
                  return -EFAULT;
      }
      return 0;
}

static void binder_release_work(struct list_head *list)
{
      struct binder_work *w;
      while (!list_empty(list)) {
            w = list_first_entry(list, struct binder_work, entry);
            list_del_init(&w->entry);
            switch (w->type) {
            case BINDER_WORK_TRANSACTION: {
                  struct binder_transaction *t;

                  t = container_of(w, struct binder_transaction, work);
                  if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
                        binder_send_failed_reply(t, BR_DEAD_REPLY);
            } break;
            case BINDER_WORK_TRANSACTION_COMPLETE: {
                  kfree(w);
                  binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
            } break;
            default:
                  break;
            }
      }

}

static struct binder_thread *binder_get_thread(struct binder_proc *proc)
{
      struct binder_thread *thread = NULL;
      struct rb_node *parent = NULL;
      struct rb_node **p = &proc->threads.rb_node;

      while (*p) {
            parent = *p;
            thread = rb_entry(parent, struct binder_thread, rb_node);

            if (current->pid < thread->pid)
                  p = &(*p)->rb_left;
            else if (current->pid > thread->pid)
                  p = &(*p)->rb_right;
            else
                  break;
      }
      if (*p == NULL) {
            thread = kzalloc(sizeof(*thread), GFP_KERNEL);
            if (thread == NULL)
                  return NULL;
            binder_stats.obj_created[BINDER_STAT_THREAD]++;
            thread->proc = proc;
            thread->pid = current->pid;
            init_waitqueue_head(&thread->wait);
            INIT_LIST_HEAD(&thread->todo);
            rb_link_node(&thread->rb_node, parent, p);
            rb_insert_color(&thread->rb_node, &proc->threads);
            thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
            thread->return_error = BR_OK;
            thread->return_error2 = BR_OK;
      }
      return thread;
}

static int binder_free_thread(struct binder_proc *proc,
                        struct binder_thread *thread)
{
      struct binder_transaction *t;
      struct binder_transaction *send_reply = NULL;
      int active_transactions = 0;

      rb_erase(&thread->rb_node, &proc->threads);
      t = thread->transaction_stack;
      if (t && t->to_thread == thread)
            send_reply = t;
      while (t) {
            active_transactions++;
            if (binder_debug_mask & BINDER_DEBUG_DEAD_TRANSACTION)
                  printk(KERN_INFO "binder: release %d:%d transaction %d "
                         "%s, still active\n", proc->pid, thread->pid,
                         t->debug_id,
                         (t->to_thread == thread) ? "in" : "out");
            if (t->to_thread == thread) {
                  t->to_proc = NULL;
                  t->to_thread = NULL;
                  if (t->buffer) {
                        t->buffer->transaction = NULL;
                        t->buffer = NULL;
                  }
                  t = t->to_parent;
            } else if (t->from == thread) {
                  t->from = NULL;
                  t = t->from_parent;
            } else
                  BUG();
      }
      if (send_reply)
            binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
      binder_release_work(&thread->todo);
      kfree(thread);
      binder_stats.obj_deleted[BINDER_STAT_THREAD]++;
      return active_transactions;
}

static unsigned int binder_poll(struct file *filp,
                        struct poll_table_struct *wait)
{
      struct binder_proc *proc = filp->private_data;
      struct binder_thread *thread = NULL;
      int wait_for_proc_work;

      mutex_lock(&binder_lock);
      thread = binder_get_thread(proc);

      wait_for_proc_work = thread->transaction_stack == NULL &&
            list_empty(&thread->todo) && thread->return_error == BR_OK;
      mutex_unlock(&binder_lock);

      if (wait_for_proc_work) {
            if (binder_has_proc_work(proc, thread))
                  return POLLIN;
            poll_wait(filp, &proc->wait, wait);
            if (binder_has_proc_work(proc, thread))
                  return POLLIN;
      } else {
            if (binder_has_thread_work(thread))
                  return POLLIN;
            poll_wait(filp, &thread->wait, wait);
            if (binder_has_thread_work(thread))
                  return POLLIN;
      }
      return 0;
}

static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
      int ret;
      struct binder_proc *proc = filp->private_data;
      struct binder_thread *thread;
      unsigned int size = _IOC_SIZE(cmd);
      void __user *ubuf = (void __user *)arg;

      /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/

      ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
      if (ret)
            return ret;

      mutex_lock(&binder_lock);
      thread = binder_get_thread(proc);
      if (thread == NULL) {
            ret = -ENOMEM;
            goto err;
      }

      switch (cmd) {
      case BINDER_WRITE_READ: {
            struct binder_write_read bwr;
            if (size != sizeof(struct binder_write_read)) {
                  ret = -EINVAL;
                  goto err;
            }
            if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
                  ret = -EFAULT;
                  goto err;
            }
            if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
                  printk(KERN_INFO "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
                         proc->pid, thread->pid, bwr.write_size, bwr.write_buffer, bwr.read_size, bwr.read_buffer);
            if (bwr.write_size > 0) {
                  ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
                  if (ret < 0) {
                        bwr.read_consumed = 0;
                        if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
                              ret = -EFAULT;
                        goto err;
                  }
            }
            if (bwr.read_size > 0) {
                  ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
                  if (!list_empty(&proc->todo))
                        wake_up_interruptible(&proc->wait);
                  if (ret < 0) {
                        if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
                              ret = -EFAULT;
                        goto err;
                  }
            }
            if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
                  printk(KERN_INFO "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
                         proc->pid, thread->pid, bwr.write_consumed, bwr.write_size, bwr.read_consumed, bwr.read_size);
            if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
                  ret = -EFAULT;
                  goto err;
            }
            break;
      }
      case BINDER_SET_MAX_THREADS:
            if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
                  ret = -EINVAL;
                  goto err;
            }
            break;
      case BINDER_SET_CONTEXT_MGR:
            if (binder_context_mgr_node != NULL) {
                  printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set\n");
                  ret = -EBUSY;
                  goto err;
            }
            if (binder_context_mgr_uid != -1) {
                  if (binder_context_mgr_uid != current->cred->euid) {
                        printk(KERN_ERR "binder: BINDER_SET_"
                               "CONTEXT_MGR bad uid %d != %d\n",
                               current->cred->euid,
                               binder_context_mgr_uid);
                        ret = -EPERM;
                        goto err;
                  }
            } else
                  binder_context_mgr_uid = current->cred->euid;
            binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
            if (binder_context_mgr_node == NULL) {
                  ret = -ENOMEM;
                  goto err;
            }
            binder_context_mgr_node->local_weak_refs++;
            binder_context_mgr_node->local_strong_refs++;
            binder_context_mgr_node->has_strong_ref = 1;
            binder_context_mgr_node->has_weak_ref = 1;
            break;
      case BINDER_THREAD_EXIT:
            if (binder_debug_mask & BINDER_DEBUG_THREADS)
                  printk(KERN_INFO "binder: %d:%d exit\n",
                         proc->pid, thread->pid);
            binder_free_thread(proc, thread);
            thread = NULL;
            break;
      case BINDER_VERSION:
            if (size != sizeof(struct binder_version)) {
                  ret = -EINVAL;
                  goto err;
            }
            if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
                  ret = -EINVAL;
                  goto err;
            }
            break;
      default:
            ret = -EINVAL;
            goto err;
      }
      ret = 0;
err:
      if (thread)
            thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
      mutex_unlock(&binder_lock);
      wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
      if (ret && ret != -ERESTARTSYS)
            printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
      return ret;
}

static void binder_vma_open(struct vm_area_struct *vma)
{
      struct binder_proc *proc = vma->vm_private_data;
      if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
            printk(KERN_INFO
                  "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
                  proc->pid, vma->vm_start, vma->vm_end,
                  (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
                  (unsigned long)pgprot_val(vma->vm_page_prot));
      dump_stack();
}

static void binder_vma_close(struct vm_area_struct *vma)
{
      struct binder_proc *proc = vma->vm_private_data;
      if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
            printk(KERN_INFO
                  "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
                  proc->pid, vma->vm_start, vma->vm_end,
                  (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
                  (unsigned long)pgprot_val(vma->vm_page_prot));
      proc->vma = NULL;
      binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
}

static struct vm_operations_struct binder_vm_ops = {
      .open = binder_vma_open,
      .close = binder_vma_close,
};

static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
{
      int ret;
      struct vm_struct *area;
      struct binder_proc *proc = filp->private_data;
      const char *failure_string;
      struct binder_buffer *buffer;

      if ((vma->vm_end - vma->vm_start) > SZ_4M)
            vma->vm_end = vma->vm_start + SZ_4M;

      if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
            printk(KERN_INFO
                  "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
                  proc->pid, vma->vm_start, vma->vm_end,
                  (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
                  (unsigned long)pgprot_val(vma->vm_page_prot));

      if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
            ret = -EPERM;
            failure_string = "bad vm_flags";
            goto err_bad_arg;
      }
      vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;

      if (proc->buffer) {
            ret = -EBUSY;
            failure_string = "already mapped";
            goto err_already_mapped;
      }

      area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
      if (area == NULL) {
            ret = -ENOMEM;
            failure_string = "get_vm_area";
            goto err_get_vm_area_failed;
      }
      proc->buffer = area->addr;
      proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;

#ifdef CONFIG_CPU_CACHE_VIPT
      if (cache_is_vipt_aliasing()) {
            while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
                  printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
                  vma->vm_start += PAGE_SIZE;
            }
      }
#endif
      proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
      if (proc->pages == NULL) {
            ret = -ENOMEM;
            failure_string = "alloc page array";
            goto err_alloc_pages_failed;
      }
      proc->buffer_size = vma->vm_end - vma->vm_start;

      vma->vm_ops = &binder_vm_ops;
      vma->vm_private_data = proc;

      if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
            ret = -ENOMEM;
            failure_string = "alloc small buf";
            goto err_alloc_small_buf_failed;
      }
      buffer = proc->buffer;
      INIT_LIST_HEAD(&proc->buffers);
      list_add(&buffer->entry, &proc->buffers);
      buffer->free = 1;
      binder_insert_free_buffer(proc, buffer);
      proc->free_async_space = proc->buffer_size / 2;
      barrier();
      proc->files = get_files_struct(current);
      proc->vma = vma;

      /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n",
             proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
      return 0;

err_alloc_small_buf_failed:
      kfree(proc->pages);
      proc->pages = NULL;
err_alloc_pages_failed:
      vfree(proc->buffer);
      proc->buffer = NULL;
err_get_vm_area_failed:
err_already_mapped:
err_bad_arg:
      printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n",
             proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
      return ret;
}

static int binder_open(struct inode *nodp, struct file *filp)
{
      struct binder_proc *proc;

      if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
            printk(KERN_INFO "binder_open: %d:%d\n",
                   current->group_leader->pid, current->pid);

      proc = kzalloc(sizeof(*proc), GFP_KERNEL);
      if (proc == NULL)
            return -ENOMEM;
      get_task_struct(current);
      proc->tsk = current;
      INIT_LIST_HEAD(&proc->todo);
      init_waitqueue_head(&proc->wait);
      proc->default_priority = task_nice(current);
      mutex_lock(&binder_lock);
      binder_stats.obj_created[BINDER_STAT_PROC]++;
      hlist_add_head(&proc->proc_node, &binder_procs);
      proc->pid = current->group_leader->pid;
      INIT_LIST_HEAD(&proc->delivered_death);
      filp->private_data = proc;
      mutex_unlock(&binder_lock);

      if (binder_proc_dir_entry_proc) {
            char strbuf[11];
            snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
            remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
            create_proc_read_entry(strbuf, S_IRUGO,
                               binder_proc_dir_entry_proc,
                               binder_read_proc_proc, proc);
      }

      return 0;
}

static int binder_flush(struct file *filp, fl_owner_t id)
{
      struct binder_proc *proc = filp->private_data;

      binder_defer_work(proc, BINDER_DEFERRED_FLUSH);

      return 0;
}

static void binder_deferred_flush(struct binder_proc *proc)
{
      struct rb_node *n;
      int wake_count = 0;
      for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
            struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
            thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
            if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
                  wake_up_interruptible(&thread->wait);
                  wake_count++;
            }
      }
      wake_up_interruptible_all(&proc->wait);

      if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
            printk(KERN_INFO "binder_flush: %d woke %d threads\n", proc->pid, wake_count);
}

static int binder_release(struct inode *nodp, struct file *filp)
{
      struct binder_proc *proc = filp->private_data;
      if (binder_proc_dir_entry_proc) {
            char strbuf[11];
            snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
            remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
      }

      binder_defer_work(proc, BINDER_DEFERRED_RELEASE);

      return 0;
}

static void binder_deferred_release(struct binder_proc *proc)
{
      struct hlist_node *pos;
      struct binder_transaction *t;
      struct rb_node *n;
      int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;

      BUG_ON(proc->vma);
      BUG_ON(proc->files);

      hlist_del(&proc->proc_node);
      if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
            if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                  printk(KERN_INFO "binder_release: %d context_mgr_node gone\n", proc->pid);
            binder_context_mgr_node = NULL;
      }

      threads = 0;
      active_transactions = 0;
      while ((n = rb_first(&proc->threads))) {
            struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
            threads++;
            active_transactions += binder_free_thread(proc, thread);
      }
      nodes = 0;
      incoming_refs = 0;
      while ((n = rb_first(&proc->nodes))) {
            struct binder_node *node = rb_entry(n, struct binder_node, rb_node);

            nodes++;
            rb_erase(&node->rb_node, &proc->nodes);
            list_del_init(&node->work.entry);
            if (hlist_empty(&node->refs)) {
                  kfree(node);
                  binder_stats.obj_deleted[BINDER_STAT_NODE]++;
            } else {
                  struct binder_ref *ref;
                  int death = 0;

                  node->proc = NULL;
                  node->local_strong_refs = 0;
                  node->local_weak_refs = 0;
                  hlist_add_head(&node->dead_node, &binder_dead_nodes);

                  hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
                        incoming_refs++;
                        if (ref->death) {
                              death++;
                              if (list_empty(&ref->death->work.entry)) {
                                    ref->death->work.type = BINDER_WORK_DEAD_BINDER;
                                    list_add_tail(&ref->death->work.entry, &ref->proc->todo);
                                    wake_up_interruptible(&ref->proc->wait);
                              } else
                                    BUG();
                        }
                  }
                  if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                        printk(KERN_INFO "binder: node %d now dead, "
                               "refs %d, death %d\n", node->debug_id,
                               incoming_refs, death);
            }
      }
      outgoing_refs = 0;
      while ((n = rb_first(&proc->refs_by_desc))) {
            struct binder_ref *ref = rb_entry(n, struct binder_ref,
                                      rb_node_desc);
            outgoing_refs++;
            binder_delete_ref(ref);
      }
      binder_release_work(&proc->todo);
      buffers = 0;

      while ((n = rb_first(&proc->allocated_buffers))) {
            struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
                                          rb_node);
            t = buffer->transaction;
            if (t) {
                  t->buffer = NULL;
                  buffer->transaction = NULL;
                  printk(KERN_ERR "binder: release proc %d, "
                         "transaction %d, not freed\n",
                         proc->pid, t->debug_id);
                  /*BUG();*/
            }
            binder_free_buf(proc, buffer);
            buffers++;
      }

      binder_stats.obj_deleted[BINDER_STAT_PROC]++;

      page_count = 0;
      if (proc->pages) {
            int i;
            for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
                  if (proc->pages[i]) {
                        if (binder_debug_mask &
                            BINDER_DEBUG_BUFFER_ALLOC)
                              printk(KERN_INFO
                                     "binder_release: %d: "
                                     "page %d at %p not freed\n",
                                     proc->pid, i,
                                     proc->buffer + i * PAGE_SIZE);
                        __free_page(proc->pages[i]);
                        page_count++;
                  }
            }
            kfree(proc->pages);
            vfree(proc->buffer);
      }

      put_task_struct(proc->tsk);

      if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
            printk(KERN_INFO
                   "binder_release: %d threads %d, nodes %d (ref %d), "
                   "refs %d, active transactions %d, buffers %d, "
                   "pages %d\n",
                   proc->pid, threads, nodes, incoming_refs, outgoing_refs,
                   active_transactions, buffers, page_count);

      kfree(proc);
}

static void binder_deferred_func(struct work_struct *work)
{
      struct binder_proc *proc;
      struct files_struct *files;

      int defer;
      do {
            mutex_lock(&binder_lock);
            mutex_lock(&binder_deferred_lock);
            if (!hlist_empty(&binder_deferred_list)) {
                  proc = hlist_entry(binder_deferred_list.first,
                              struct binder_proc, deferred_work_node);
                  hlist_del_init(&proc->deferred_work_node);
                  defer = proc->deferred_work;
                  proc->deferred_work = 0;
            } else {
                  proc = NULL;
                  defer = 0;
            }
            mutex_unlock(&binder_deferred_lock);

            files = NULL;
            if (defer & BINDER_DEFERRED_PUT_FILES) {
                  files = proc->files;
                  if (files)
                        proc->files = NULL;
            }

            if (defer & BINDER_DEFERRED_FLUSH)
                  binder_deferred_flush(proc);

            if (defer & BINDER_DEFERRED_RELEASE)
                  binder_deferred_release(proc); /* frees proc */

            mutex_unlock(&binder_lock);
            if (files)
                  put_files_struct(files);
      } while (proc);
}
static DECLARE_WORK(binder_deferred_work, binder_deferred_func);

static void binder_defer_work(struct binder_proc *proc, int defer)
{
      mutex_lock(&binder_deferred_lock);
      proc->deferred_work |= defer;
      if (hlist_unhashed(&proc->deferred_work_node)) {
            hlist_add_head(&proc->deferred_work_node,
                        &binder_deferred_list);
            schedule_work(&binder_deferred_work);
      }
      mutex_unlock(&binder_deferred_lock);
}

static char *print_binder_transaction(char *buf, char *end, const char *prefix,
                              struct binder_transaction *t)
{
      buf += snprintf(buf, end - buf,
                  "%s %d: %p from %d:%d to %d:%d code %x "
                  "flags %x pri %ld r%d",
                  prefix, t->debug_id, t,
                  t->from ? t->from->proc->pid : 0,
                  t->from ? t->from->pid : 0,
                  t->to_proc ? t->to_proc->pid : 0,
                  t->to_thread ? t->to_thread->pid : 0,
                  t->code, t->flags, t->priority, t->need_reply);
      if (buf >= end)
            return buf;
      if (t->buffer == NULL) {
            buf += snprintf(buf, end - buf, " buffer free\n");
            return buf;
      }
      if (t->buffer->target_node) {
            buf += snprintf(buf, end - buf, " node %d",
                        t->buffer->target_node->debug_id);
            if (buf >= end)
                  return buf;
      }
      buf += snprintf(buf, end - buf, " size %zd:%zd data %p\n",
                  t->buffer->data_size, t->buffer->offsets_size,
                  t->buffer->data);
      return buf;
}

static char *print_binder_buffer(char *buf, char *end, const char *prefix,
                         struct binder_buffer *buffer)
{
      buf += snprintf(buf, end - buf, "%s %d: %p size %zd:%zd %s\n",
                  prefix, buffer->debug_id, buffer->data,
                  buffer->data_size, buffer->offsets_size,
                  buffer->transaction ? "active" : "delivered");
      return buf;
}

static char *print_binder_work(char *buf, char *end, const char *prefix,
                         const char *transaction_prefix,
                         struct binder_work *w)
{
      struct binder_node *node;
      struct binder_transaction *t;

      switch (w->type) {
      case BINDER_WORK_TRANSACTION:
            t = container_of(w, struct binder_transaction, work);
            buf = print_binder_transaction(buf, end, transaction_prefix, t);
            break;
      case BINDER_WORK_TRANSACTION_COMPLETE:
            buf += snprintf(buf, end - buf,
                        "%stransaction complete\n", prefix);
            break;
      case BINDER_WORK_NODE:
            node = container_of(w, struct binder_node, work);
            buf += snprintf(buf, end - buf, "%snode work %d: u%p c%p\n",
                        prefix, node->debug_id, node->ptr,
                        node->cookie);
            break;
      case BINDER_WORK_DEAD_BINDER:
            buf += snprintf(buf, end - buf, "%shas dead binder\n", prefix);
            break;
      case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
            buf += snprintf(buf, end - buf,
                        "%shas cleared dead binder\n", prefix);
            break;
      case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
            buf += snprintf(buf, end - buf,
                        "%shas cleared death notification\n", prefix);
            break;
      default:
            buf += snprintf(buf, end - buf, "%sunknown work: type %d\n",
                        prefix, w->type);
            break;
      }
      return buf;
}

static char *print_binder_thread(char *buf, char *end,
                         struct binder_thread *thread,
                         int print_always)
{
      struct binder_transaction *t;
      struct binder_work *w;
      char *start_buf = buf;
      char *header_buf;

      buf += snprintf(buf, end - buf, "  thread %d: l %02x\n",
                  thread->pid, thread->looper);
      header_buf = buf;
      t = thread->transaction_stack;
      while (t) {
            if (buf >= end)
                  break;
            if (t->from == thread) {
                  buf = print_binder_transaction(buf, end,
                                    "    outgoing transaction", t);
                  t = t->from_parent;
            } else if (t->to_thread == thread) {
                  buf = print_binder_transaction(buf, end,
                                    "    incoming transaction", t);
                  t = t->to_parent;
            } else {
                  buf = print_binder_transaction(buf, end,
                                    "    bad transaction", t);
                  t = NULL;
            }
      }
      list_for_each_entry(w, &thread->todo, entry) {
            if (buf >= end)
                  break;
            buf = print_binder_work(buf, end, "    ",
                              "    pending transaction", w);
      }
      if (!print_always && buf == header_buf)
            buf = start_buf;
      return buf;
}

static char *print_binder_node(char *buf, char *end, struct binder_node *node)
{
      struct binder_ref *ref;
      struct hlist_node *pos;
      struct binder_work *w;
      int count;

      count = 0;
      hlist_for_each_entry(ref, pos, &node->refs, node_entry)
            count++;

      buf += snprintf(buf, end - buf,
                  "  node %d: u%p c%p hs %d hw %d ls %d lw %d "
                  "is %d iw %d",
                  node->debug_id, node->ptr, node->cookie,
                  node->has_strong_ref, node->has_weak_ref,
                  node->local_strong_refs, node->local_weak_refs,
                  node->internal_strong_refs, count);
      if (buf >= end)
            return buf;
      if (count) {
            buf += snprintf(buf, end - buf, " proc");
            if (buf >= end)
                  return buf;
            hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
                  buf += snprintf(buf, end - buf, " %d", ref->proc->pid);
                  if (buf >= end)
                        return buf;
            }
      }
      buf += snprintf(buf, end - buf, "\n");
      list_for_each_entry(w, &node->async_todo, entry) {
            if (buf >= end)
                  break;
            buf = print_binder_work(buf, end, "    ",
                              "    pending async transaction", w);
      }
      return buf;
}

static char *print_binder_ref(char *buf, char *end, struct binder_ref *ref)
{
      buf += snprintf(buf, end - buf,
                  "  ref %d: desc %d %snode %d s %d w %d d %p\n",
                  ref->debug_id, ref->desc,
                  ref->node->proc ? "" : "dead ", ref->node->debug_id,
                  ref->strong, ref->weak, ref->death);
      return buf;
}

static char *print_binder_proc(char *buf, char *end,
                         struct binder_proc *proc, int print_all)
{
      struct binder_work *w;
      struct rb_node *n;
      char *start_buf = buf;
      char *header_buf;

      buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
      header_buf = buf;

      for (n = rb_first(&proc->threads);
           n != NULL && buf < end;
           n = rb_next(n))
            buf = print_binder_thread(buf, end,
                                rb_entry(n, struct binder_thread,
                                       rb_node), print_all);
      for (n = rb_first(&proc->nodes);
           n != NULL && buf < end;
           n = rb_next(n)) {
            struct binder_node *node = rb_entry(n, struct binder_node,
                                        rb_node);
            if (print_all || node->has_async_transaction)
                  buf = print_binder_node(buf, end, node);
      }
      if (print_all) {
            for (n = rb_first(&proc->refs_by_desc);
                 n != NULL && buf < end;
                 n = rb_next(n))
                  buf = print_binder_ref(buf, end,
                                     rb_entry(n, struct binder_ref,
                                          rb_node_desc));
      }
      for (n = rb_first(&proc->allocated_buffers);
           n != NULL && buf < end;
           n = rb_next(n))
            buf = print_binder_buffer(buf, end, "  buffer",
                                rb_entry(n, struct binder_buffer,
                                       rb_node));
      list_for_each_entry(w, &proc->todo, entry) {
            if (buf >= end)
                  break;
            buf = print_binder_work(buf, end, "  ",
                              "  pending transaction", w);
      }
      list_for_each_entry(w, &proc->delivered_death, entry) {
            if (buf >= end)
                  break;
            buf += snprintf(buf, end - buf,
                        "  has delivered dead binder\n");
            break;
      }
      if (!print_all && buf == header_buf)
            buf = start_buf;
      return buf;
}

static const char *binder_return_strings[] = {
      "BR_ERROR",
      "BR_OK",
      "BR_TRANSACTION",
      "BR_REPLY",
      "BR_ACQUIRE_RESULT",
      "BR_DEAD_REPLY",
      "BR_TRANSACTION_COMPLETE",
      "BR_INCREFS",
      "BR_ACQUIRE",
      "BR_RELEASE",
      "BR_DECREFS",
      "BR_ATTEMPT_ACQUIRE",
      "BR_NOOP",
      "BR_SPAWN_LOOPER",
      "BR_FINISHED",
      "BR_DEAD_BINDER",
      "BR_CLEAR_DEATH_NOTIFICATION_DONE",
      "BR_FAILED_REPLY"
};

static const char *binder_command_strings[] = {
      "BC_TRANSACTION",
      "BC_REPLY",
      "BC_ACQUIRE_RESULT",
      "BC_FREE_BUFFER",
      "BC_INCREFS",
      "BC_ACQUIRE",
      "BC_RELEASE",
      "BC_DECREFS",
      "BC_INCREFS_DONE",
      "BC_ACQUIRE_DONE",
      "BC_ATTEMPT_ACQUIRE",
      "BC_REGISTER_LOOPER",
      "BC_ENTER_LOOPER",
      "BC_EXIT_LOOPER",
      "BC_REQUEST_DEATH_NOTIFICATION",
      "BC_CLEAR_DEATH_NOTIFICATION",
      "BC_DEAD_BINDER_DONE"
};

static const char *binder_objstat_strings[] = {
      "proc",
      "thread",
      "node",
      "ref",
      "death",
      "transaction",
      "transaction_complete"
};

static char *print_binder_stats(char *buf, char *end, const char *prefix,
                        struct binder_stats *stats)
{
      int i;

      BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
                  ARRAY_SIZE(binder_command_strings));
      for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
            if (stats->bc[i])
                  buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
                              binder_command_strings[i],
                              stats->bc[i]);
            if (buf >= end)
                  return buf;
      }

      BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
                  ARRAY_SIZE(binder_return_strings));
      for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
            if (stats->br[i])
                  buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
                              binder_return_strings[i], stats->br[i]);
            if (buf >= end)
                  return buf;
      }

      BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
                  ARRAY_SIZE(binder_objstat_strings));
      BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
                  ARRAY_SIZE(stats->obj_deleted));
      for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
            if (stats->obj_created[i] || stats->obj_deleted[i])
                  buf += snprintf(buf, end - buf,
                              "%s%s: active %d total %d\n", prefix,
                              binder_objstat_strings[i],
                              stats->obj_created[i] -
                                    stats->obj_deleted[i],
                              stats->obj_created[i]);
            if (buf >= end)
                  return buf;
      }
      return buf;
}

static char *print_binder_proc_stats(char *buf, char *end,
                             struct binder_proc *proc)
{
      struct binder_work *w;
      struct rb_node *n;
      int count, strong, weak;

      buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
      if (buf >= end)
            return buf;
      count = 0;
      for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
            count++;
      buf += snprintf(buf, end - buf, "  threads: %d\n", count);
      if (buf >= end)
            return buf;
      buf += snprintf(buf, end - buf, "  requested threads: %d+%d/%d\n"
                  "  ready threads %d\n"
                  "  free async space %zd\n", proc->requested_threads,
                  proc->requested_threads_started, proc->max_threads,
                  proc->ready_threads, proc->free_async_space);
      if (buf >= end)
            return buf;
      count = 0;
      for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
            count++;
      buf += snprintf(buf, end - buf, "  nodes: %d\n", count);
      if (buf >= end)
            return buf;
      count = 0;
      strong = 0;
      weak = 0;
      for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
            struct binder_ref *ref = rb_entry(n, struct binder_ref,
                                      rb_node_desc);
            count++;
            strong += ref->strong;
            weak += ref->weak;
      }
      buf += snprintf(buf, end - buf, "  refs: %d s %d w %d\n",
                  count, strong, weak);
      if (buf >= end)
            return buf;

      count = 0;
      for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
            count++;
      buf += snprintf(buf, end - buf, "  buffers: %d\n", count);
      if (buf >= end)
            return buf;

      count = 0;
      list_for_each_entry(w, &proc->todo, entry) {
            switch (w->type) {
            case BINDER_WORK_TRANSACTION:
                  count++;
                  break;
            default:
                  break;
            }
      }
      buf += snprintf(buf, end - buf, "  pending transactions: %d\n", count);
      if (buf >= end)
            return buf;

      buf = print_binder_stats(buf, end, "  ", &proc->stats);

      return buf;
}


static int binder_read_proc_state(char *page, char **start, off_t off,
                          int count, int *eof, void *data)
{
      struct binder_proc *proc;
      struct hlist_node *pos;
      struct binder_node *node;
      int len = 0;
      char *buf = page;
      char *end = page + PAGE_SIZE;
      int do_lock = !binder_debug_no_lock;

      if (off)
            return 0;

      if (do_lock)
            mutex_lock(&binder_lock);

      buf += snprintf(buf, end - buf, "binder state:\n");

      if (!hlist_empty(&binder_dead_nodes))
            buf += snprintf(buf, end - buf, "dead nodes:\n");
      hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) {
            if (buf >= end)
                  break;
            buf = print_binder_node(buf, end, node);
      }

      hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
            if (buf >= end)
                  break;
            buf = print_binder_proc(buf, end, proc, 1);
      }
      if (do_lock)
            mutex_unlock(&binder_lock);
      if (buf > page + PAGE_SIZE)
            buf = page + PAGE_SIZE;

      *start = page + off;

      len = buf - page;
      if (len > off)
            len -= off;
      else
            len = 0;

      return len < count ? len  : count;
}

static int binder_read_proc_stats(char *page, char **start, off_t off,
                          int count, int *eof, void *data)
{
      struct binder_proc *proc;
      struct hlist_node *pos;
      int len = 0;
      char *p = page;
      int do_lock = !binder_debug_no_lock;

      if (off)
            return 0;

      if (do_lock)
            mutex_lock(&binder_lock);

      p += snprintf(p, PAGE_SIZE, "binder stats:\n");

      p = print_binder_stats(p, page + PAGE_SIZE, "", &binder_stats);

      hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
            if (p >= page + PAGE_SIZE)
                  break;
            p = print_binder_proc_stats(p, page + PAGE_SIZE, proc);
      }
      if (do_lock)
            mutex_unlock(&binder_lock);
      if (p > page + PAGE_SIZE)
            p = page + PAGE_SIZE;

      *start = page + off;

      len = p - page;
      if (len > off)
            len -= off;
      else
            len = 0;

      return len < count ? len  : count;
}

static int binder_read_proc_transactions(char *page, char **start, off_t off,
                               int count, int *eof, void *data)
{
      struct binder_proc *proc;
      struct hlist_node *pos;
      int len = 0;
      char *buf = page;
      char *end = page + PAGE_SIZE;
      int do_lock = !binder_debug_no_lock;

      if (off)
            return 0;

      if (do_lock)
            mutex_lock(&binder_lock);

      buf += snprintf(buf, end - buf, "binder transactions:\n");
      hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
            if (buf >= end)
                  break;
            buf = print_binder_proc(buf, end, proc, 0);
      }
      if (do_lock)
            mutex_unlock(&binder_lock);
      if (buf > page + PAGE_SIZE)
            buf = page + PAGE_SIZE;

      *start = page + off;

      len = buf - page;
      if (len > off)
            len -= off;
      else
            len = 0;

      return len < count ? len  : count;
}

static int binder_read_proc_proc(char *page, char **start, off_t off,
                         int count, int *eof, void *data)
{
      struct binder_proc *proc = data;
      int len = 0;
      char *p = page;
      int do_lock = !binder_debug_no_lock;

      if (off)
            return 0;

      if (do_lock)
            mutex_lock(&binder_lock);
      p += snprintf(p, PAGE_SIZE, "binder proc state:\n");
      p = print_binder_proc(p, page + PAGE_SIZE, proc, 1);
      if (do_lock)
            mutex_unlock(&binder_lock);

      if (p > page + PAGE_SIZE)
            p = page + PAGE_SIZE;
      *start = page + off;

      len = p - page;
      if (len > off)
            len -= off;
      else
            len = 0;

      return len < count ? len  : count;
}

static char *print_binder_transaction_log_entry(char *buf, char *end,
                              struct binder_transaction_log_entry *e)
{
      buf += snprintf(buf, end - buf,
                  "%d: %s from %d:%d to %d:%d node %d handle %d "
                  "size %d:%d\n",
                  e->debug_id, (e->call_type == 2) ? "reply" :
                  ((e->call_type == 1) ? "async" : "call "), e->from_proc,
                  e->from_thread, e->to_proc, e->to_thread, e->to_node,
                  e->target_handle, e->data_size, e->offsets_size);
      return buf;
}

static int binder_read_proc_transaction_log(
      char *page, char **start, off_t off, int count, int *eof, void *data)
{
      struct binder_transaction_log *log = data;
      int len = 0;
      int i;
      char *buf = page;
      char *end = page + PAGE_SIZE;

      if (off)
            return 0;

      if (log->full) {
            for (i = log->next; i < ARRAY_SIZE(log->entry); i++) {
                  if (buf >= end)
                        break;
                  buf = print_binder_transaction_log_entry(buf, end,
                                                &log->entry[i]);
            }
      }
      for (i = 0; i < log->next; i++) {
            if (buf >= end)
                  break;
            buf = print_binder_transaction_log_entry(buf, end,
                                           &log->entry[i]);
      }

      *start = page + off;

      len = buf - page;
      if (len > off)
            len -= off;
      else
            len = 0;

      return len < count ? len  : count;
}

static const struct file_operations binder_fops = {
      .owner = THIS_MODULE,
      .poll = binder_poll,
      .unlocked_ioctl = binder_ioctl,
      .mmap = binder_mmap,
      .open = binder_open,
      .flush = binder_flush,
      .release = binder_release,
};

static struct miscdevice binder_miscdev = {
      .minor = MISC_DYNAMIC_MINOR,
      .name = "binder",
      .fops = &binder_fops
};

static int __init binder_init(void)
{
      int ret;

      binder_proc_dir_entry_root = proc_mkdir("binder", NULL);
      if (binder_proc_dir_entry_root)
            binder_proc_dir_entry_proc = proc_mkdir("proc",
                                    binder_proc_dir_entry_root);
      ret = misc_register(&binder_miscdev);
      if (binder_proc_dir_entry_root) {
            create_proc_read_entry("state",
                               S_IRUGO,
                               binder_proc_dir_entry_root,
                               binder_read_proc_state,
                               NULL);
            create_proc_read_entry("stats",
                               S_IRUGO,
                               binder_proc_dir_entry_root,
                               binder_read_proc_stats,
                               NULL);
            create_proc_read_entry("transactions",
                               S_IRUGO,
                               binder_proc_dir_entry_root,
                               binder_read_proc_transactions,
                               NULL);
            create_proc_read_entry("transaction_log",
                               S_IRUGO,
                               binder_proc_dir_entry_root,
                               binder_read_proc_transaction_log,
                               &binder_transaction_log);
            create_proc_read_entry("failed_transaction_log",
                               S_IRUGO,
                               binder_proc_dir_entry_root,
                               binder_read_proc_transaction_log,
                               &binder_transaction_log_failed);
      }
      return ret;
}

device_initcall(binder_init);

MODULE_LICENSE("GPL v2");

Generated by  Doxygen 1.6.0   Back to index