binder
/* drivers/misc/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
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
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 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
#ifndef __i386__
#define FORBIDDEN_MMAP_FLAGS (VM_WRITE | VM_EXEC)
#else
#define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
#endif
#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
};
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;
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;
};
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;
}
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;
};
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;
int min_priority : 8;
struct list_head async_todo;
};
struct binder_ref_death {
struct binder_work work;
void __user *cookie;
};
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;
};
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];
};
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;
void *buffer;
size_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
};
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;
};
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;
};
/*
* copied from get_unused_fd_flags
*/
int task_get_unused_fd_flags(struct task_struct *tsk, int flags)
{
struct files_struct *files = get_files_struct(tsk);
int fd, error;
struct fdtable *fdt;
unsigned long rlim_cur;
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.
*/
rcu_read_lock();
if (tsk->signal)
rlim_cur = tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
else
rlim_cur = 0;
rcu_read_unlock();
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);
put_files_struct(files);
return error;
}
/*
* copied from fd_install
*/
static void task_fd_install(
struct task_struct *tsk, unsigned int fd, struct file *file)
{
struct files_struct *files = get_files_struct(tsk);
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);
put_files_struct(files);
}
/*
* 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 task_struct *tsk, unsigned int fd)
{
struct file *filp;
struct files_struct *files = get_files_struct(tsk);
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;
put_files_struct(files);
return retval;
out_unlock:
spin_unlock(&files->file_lock);
put_files_struct(files);
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 %d, "
"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 = (size_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, (size_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 %d-%d/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 %d f"
"ailed, 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 %d 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 %d got buff"
"er %p size %d/n", proc->pid, size, buffer, buffer_size);
has_page_addr =
(void *)(((size_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((size_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((size_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 %d 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 %d "
"async free %d/n", proc->pid, size,
proc->free_async_space);
}
return buffer;
}
static void *buffer_start_page(struct binder_buffer *buffer)
{
return (void *)((size_t)buffer & PAGE_MASK);
}
static void *buffer_end_page(struct binder_buffer *buffer)
{
return (void *)(((size_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 %d buffer"
"_size %d/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 %d "
"async free %d/n", proc->pid, size,
proc->free_async_space);
}
binder_update_page_range(proc, 0,
(void *)PAGE_ALIGN((size_t)buffer->data),
(void *)(((size_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;
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 %d-%d/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 %d-%d/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 = task_euid(proc->tsk);
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;
}
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)) {
binder_user_error("binder: %d:%d got transaction with "
"invalid offset, %d/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->tsk, O_CLOEXEC);
if (target_fd < 0) {
fput(file);
return_error = BR_FAILED_REPLY;
goto err_get_unused_fd_failed;
}
task_fd_install(target_proc->tsk, 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 %d-%d/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 %d-%d, 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)) {
printk(KERN_ERR "binder: transaction release %d bad offset %d, size %d/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->tsk, 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 = container_of(w, struct binder_ref_death, work);
uint32_t cmd;
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 *)((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 %d-%d 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 = 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_euid()) {
printk(KERN_ERR "binder: BINDER_SET_"
"CONTEXT_MGR bad uid %d != %d/n",
current_euid(),
binder_context_mgr_uid);
ret = -EPERM;
goto err;
}
} else
binder_context_mgr_uid = current_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, 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, vma->vm_page_prot);
proc->vma = NULL;
}
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, 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;
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 - (size_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->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);
err_alloc_pages_failed:
vfree(proc->buffer);
err_get_vm_area_failed:
mutex_unlock(&binder_lock);
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);
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 rb_node *n;
struct binder_proc *proc = filp->private_data;
int wake_count = 0;
mutex_lock(&binder_lock);
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);
mutex_unlock(&binder_lock);
if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
printk(KERN_INFO "binder_flush: %d woke %d threads/n", proc->pid, wake_count);
return 0;
}
static int binder_release(struct inode *nodp, struct file *filp)
{
struct hlist_node *pos;
struct binder_transaction *t;
struct rb_node *n;
struct binder_proc *proc = filp->private_data;
int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
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);
}
mutex_lock(&binder_lock);
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]++;
mutex_unlock(&binder_lock);
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);
return 0;
}
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 %d:%d 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 %d:%d %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 %d/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 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);
nder