首页 > 代码库 > 第6课第2节_Binder系统_驱动情景分析_打印数据交互过程
第6课第2节_Binder系统_驱动情景分析_打印数据交互过程
添加宏：
功能：把NAME(n) 中的n作为字符串返回，eg:BR_NOOP作为字符串返回
BR开头：Binder--->IPC
BC开头：IPC------>Binder
#define NAME(n) case n: return #n const char *binder_cmd_name(uint32_t cmd) { switch(cmd) { NAME(BR_NOOP); NAME(BR_TRANSACTION_COMPLETE); NAME(BR_INCREFS); NAME(BR_ACQUIRE); NAME(BR_RELEASE); NAME(BR_DECREFS); NAME(BR_TRANSACTION); NAME(BR_REPLY); NAME(BR_FAILED_REPLY); NAME(BR_DEAD_REPLY); NAME(BR_DEAD_BINDER); NAME(BC_TRANSACTION); NAME(BC_REPLY); NAME(BC_ACQUIRE_RESULT); NAME(BC_FREE_BUFFER); NAME(BC_INCREFS); NAME(BC_ACQUIRE); NAME(BC_RELEASE); NAME(BC_DECREFS); NAME(BC_INCREFS_DONE); NAME(BC_ACQUIRE_DONE); NAME(BC_ATTEMPT_ACQUIRE); NAME(BC_REGISTER_LOOPER); NAME(BC_ENTER_LOOPER); NAME(BC_EXIT_LOOPER); NAME(BC_REQUEST_DEATH_NOTIFICATION); NAME(BC_CLEAR_DEATH_NOTIFICATION); NAME(BC_DEAD_BINDER_DONE); default: 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)
这个函数里面：
put_user 前面都加入：
/* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(BR_NOOP));
static void hexdump(void *_data, size_t len) { unsigned char *data =http://www.mamicode.com/ _data; size_t count; for (count = 0; count < len; count++) { if ((count & 15) == 0) printk("%04zu:", count); printk(" %02x %c", *data, (*data < 32) || (*data > 126) ? ‘.‘ : *data); data++; if ((count & 15) == 15) printk("\n"); } if ((count & 15) != 0) printk("\n"); }
2. IPC数据交互过程
源码下载方法
第一次:
git clone https://github.com/weidongshan/DRV_0003_Binder.git
更新:
git pull origin
取出指定版本:
git checkout v1 // 添加打印信息
binder.c
/* binder.c * * Android IPC Subsystem * * Copyright (C) 2007-2008 Google, Inc. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <asm/cacheflush.h> #include <linux/fdtable.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/list.h> #include <linux/miscdevice.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/rtmutex.h> #include <linux/mutex.h> #include <linux/nsproxy.h> #include <linux/poll.h> #include <linux/debugfs.h> #include <linux/rbtree.h> #include <linux/sched.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/vmalloc.h> #include <linux/security.h> #include "binder.h" #define NAME(n) case n: return #n const char *binder_cmd_name(uint32_t cmd) { switch(cmd) { NAME(BR_NOOP); NAME(BR_TRANSACTION_COMPLETE); NAME(BR_INCREFS); NAME(BR_ACQUIRE); NAME(BR_RELEASE); NAME(BR_DECREFS); NAME(BR_TRANSACTION); NAME(BR_REPLY); NAME(BR_FAILED_REPLY); NAME(BR_DEAD_REPLY); NAME(BR_DEAD_BINDER); NAME(BC_TRANSACTION); NAME(BC_REPLY); NAME(BC_ACQUIRE_RESULT); NAME(BC_FREE_BUFFER); NAME(BC_INCREFS); NAME(BC_ACQUIRE); NAME(BC_RELEASE); NAME(BC_DECREFS); NAME(BC_INCREFS_DONE); NAME(BC_ACQUIRE_DONE); NAME(BC_ATTEMPT_ACQUIRE); NAME(BC_REGISTER_LOOPER); NAME(BC_ENTER_LOOPER); NAME(BC_EXIT_LOOPER); NAME(BC_REQUEST_DEATH_NOTIFICATION); NAME(BC_CLEAR_DEATH_NOTIFICATION); NAME(BC_DEAD_BINDER_DONE); default: return "???"; } } static void hexdump(void *_data, size_t len) { unsigned char *data =http://www.mamicode.com/ _data; size_t count; for (count = 0; count < len; count++) { if ((count & 15) == 0) printk("%04zu:", count); printk(" %02x %c", *data, (*data < 32) || (*data > 126) ? ‘.‘ : *data); data++; if ((count & 15) == 15) printk("\n"); } if ((count & 15) != 0) printk("\n"); } static DEFINE_RT_MUTEX(binder_main_lock); static DEFINE_MUTEX(binder_deferred_lock); static DEFINE_MUTEX(binder_mmap_lock); static HLIST_HEAD(binder_procs); static HLIST_HEAD(binder_deferred_list); static HLIST_HEAD(binder_dead_nodes); static struct dentry *binder_debugfs_dir_entry_root; static struct dentry *binder_debugfs_dir_entry_proc; static struct binder_node *binder_context_mgr_node; static uid_t binder_context_mgr_uid = -1; static int binder_last_id; static struct workqueue_struct *binder_deferred_workqueue; #define BINDER_DEBUG_ENTRY(name) static int binder_##name##_open(struct inode *inode, struct file *file) { return single_open(file, binder_##name##_show, inode->i_private); } static const struct file_operations binder_##name##_fops = { .owner = THIS_MODULE, .open = binder_##name##_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, } static int binder_proc_show(struct seq_file *m, void *unused); BINDER_DEBUG_ENTRY(proc); /* This is only defined in include/asm-arm/sizes.h */ #ifndef SZ_1K #define SZ_1K 0x400 #endif #ifndef SZ_4M #define SZ_4M 0x400000 #endif #define FORBIDDEN_MMAP_FLAGS (VM_WRITE) #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64) enum { BINDER_DEBUG_USER_ERROR = 1U << 0, BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1, BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2, BINDER_DEBUG_OPEN_CLOSE = 1U << 3, BINDER_DEBUG_DEAD_BINDER = 1U << 4, BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5, BINDER_DEBUG_READ_WRITE = 1U << 6, BINDER_DEBUG_USER_REFS = 1U << 7, BINDER_DEBUG_THREADS = 1U << 8, BINDER_DEBUG_TRANSACTION = 1U << 9, BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10, BINDER_DEBUG_FREE_BUFFER = 1U << 11, BINDER_DEBUG_INTERNAL_REFS = 1U << 12, BINDER_DEBUG_BUFFER_ALLOC = 1U << 13, BINDER_DEBUG_PRIORITY_CAP = 1U << 14, BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 15, }; static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR | BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION; module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO); static int binder_debug_no_lock; module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO); static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait); static int binder_stop_on_user_error; static int binder_set_stop_on_user_error(const char *val, struct kernel_param *kp) { int ret; ret = param_set_int(val, kp); if (binder_stop_on_user_error < 2) wake_up(&binder_user_error_wait); return ret; } module_param_call(stop_on_user_error, binder_set_stop_on_user_error, param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO); #define binder_debug(mask, x...) do { if (binder_debug_mask & mask) printk(KERN_INFO x); } while (0) #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_types { 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; static inline void binder_stats_deleted(enum binder_stat_types type) { binder_stats.obj_deleted[type]++; } static inline void binder_stats_created(enum binder_stat_types type) { binder_stats.obj_created[type]++; } 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]; }; static struct binder_transaction_log binder_transaction_log; static 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; unsigned 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]; }; enum binder_deferred_state { BINDER_DEFERRED_PUT_FILES = 0x01, BINDER_DEFERRED_FLUSH = 0x02, BINDER_DEFERRED_RELEASE = 0x04, }; 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 mm_struct *vma_vm_mm; struct task_struct *tsk; struct files_struct *files; struct hlist_node deferred_work_node; int deferred_work; void *buffer; ptrdiff_t user_buffer_offset; struct list_head buffers; struct rb_root free_buffers; struct rb_root allocated_buffers; size_t free_async_space; struct page **pages; size_t buffer_size; uint32_t buffer_free; struct list_head todo; wait_queue_head_t wait; struct binder_stats stats; struct list_head delivered_death; int max_threads; int requested_threads; int requested_threads_started; int ready_threads; long default_priority; struct dentry *debugfs_entry; }; 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; }; static void binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer); /* * copied from get_unused_fd_flags */ int task_get_unused_fd_flags(struct binder_proc *proc, int flags) { struct files_struct *files = proc->files; int fd, error; struct fdtable *fdt; unsigned long rlim_cur; unsigned long irqs; if (files == NULL) return -ESRCH; error = -EMFILE; spin_lock(&files->file_lock); repeat: fdt = files_fdtable(files); fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds, files->next_fd); /* * N.B. For clone tasks sharing a files structure, this test * will limit the total number of files that can be opened. */ rlim_cur = 0; if (lock_task_sighand(proc->tsk, &irqs)) { rlim_cur = proc->tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur; unlock_task_sighand(proc->tsk, &irqs); } if (fd >= rlim_cur) goto out; /* Do we need to expand the fd array or fd set? */ error = expand_files(files, fd); if (error < 0) goto out; if (error) { /* * If we needed to expand the fs array we * might have blocked - try again. */ error = -EMFILE; goto repeat; } FD_SET(fd, fdt->open_fds); if (flags & O_CLOEXEC) FD_SET(fd, fdt->close_on_exec); else FD_CLR(fd, fdt->close_on_exec); files->next_fd = fd + 1; #if 1 /* Sanity check */ if (fdt->fd[fd] != NULL) { printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd); fdt->fd[fd] = NULL; } #endif error = fd; out: spin_unlock(&files->file_lock); return error; } /* * copied from fd_install */ static void task_fd_install( struct binder_proc *proc, unsigned int fd, struct file *file) { struct files_struct *files = proc->files; struct fdtable *fdt; if (files == NULL) return; spin_lock(&files->file_lock); fdt = files_fdtable(files); BUG_ON(fdt->fd[fd] != NULL); rcu_assign_pointer(fdt->fd[fd], file); spin_unlock(&files->file_lock); } /* * copied from __put_unused_fd in open.c */ static void __put_unused_fd(struct files_struct *files, unsigned int fd) { struct fdtable *fdt = files_fdtable(files); __FD_CLR(fd, fdt->open_fds); if (fd < files->next_fd) files->next_fd = fd; } /* * copied from sys_close */ static long task_close_fd(struct binder_proc *proc, unsigned int fd) { struct file *filp; struct files_struct *files = proc->files; struct fdtable *fdt; int retval; if (files == NULL) return -ESRCH; spin_lock(&files->file_lock); fdt = files_fdtable(files); if (fd >= fdt->max_fds) goto out_unlock; filp = fdt->fd[fd]; if (!filp) goto out_unlock; rcu_assign_pointer(fdt->fd[fd], NULL); FD_CLR(fd, fdt->close_on_exec); __put_unused_fd(files, fd); spin_unlock(&files->file_lock); retval = filp_close(filp, files); /* can‘t restart close syscall because file table entry was cleared */ if (unlikely(retval == -ERESTARTSYS || retval == -ERESTARTNOINTR || retval == -ERESTARTNOHAND || retval == -ERESTART_RESTARTBLOCK)) retval = -EINTR; return retval; out_unlock: spin_unlock(&files->file_lock); return -EBADF; } static inline void binder_lock(const char *tag) { rt_mutex_lock(&binder_main_lock); } static inline void binder_unlock(const char *tag) { rt_mutex_unlock(&binder_main_lock); } 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; binder_debug(BINDER_DEBUG_PRIORITY_CAP, "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); binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "binder: %d: add free buffer, size %zd, " "at %p\n", proc->pid, new_buffer_size, new_buffer); while (*p) { parent = *p; buffer = rb_entry(parent, struct binder_buffer, rb_node); BUG_ON(!buffer->free); buffer_size = binder_buffer_size(proc, buffer); if (new_buffer_size < buffer_size) p = &parent->rb_left; else p = &parent->rb_right; } rb_link_node(&new_buffer->rb_node, parent, p); rb_insert_color(&new_buffer->rb_node, &proc->free_buffers); } static void binder_insert_allocated_buffer(struct binder_proc *proc, struct binder_buffer *new_buffer) { struct rb_node **p = &proc->allocated_buffers.rb_node; struct rb_node *parent = NULL; struct binder_buffer *buffer; BUG_ON(new_buffer->free); while (*p) { parent = *p; buffer = rb_entry(parent, struct binder_buffer, rb_node); BUG_ON(buffer->free); if (new_buffer < buffer) p = &parent->rb_left; else if (new_buffer > buffer) p = &parent->rb_right; else BUG(); } rb_link_node(&new_buffer->rb_node, parent, p); rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers); } static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc, void __user *user_ptr) { struct rb_node *n = proc->allocated_buffers.rb_node; struct binder_buffer *buffer; struct binder_buffer *kern_ptr; kern_ptr = user_ptr - proc->user_buffer_offset - offsetof(struct binder_buffer, data); while (n) { buffer = rb_entry(n, struct binder_buffer, rb_node); BUG_ON(buffer->free); if (kern_ptr < buffer) n = n->rb_left; else if (kern_ptr > buffer) n = n->rb_right; else return buffer; } return NULL; } static int binder_update_page_range(struct binder_proc *proc, int allocate, void *start, void *end, struct vm_area_struct *vma) { void *page_addr; unsigned long user_page_addr; struct vm_struct tmp_area; struct page **page; struct mm_struct *mm; binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "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 (vma && mm != proc->vma_vm_mm) { pr_err("binder: %d: vma mm and task mm mismatch\n", proc->pid); vma = NULL; } } 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_HIGHMEM | __GFP_ZERO); if (*page == NULL) { printk(KERN_ERR "binder: %d: binder_alloc_buf failed " "for page at %p\n", proc->pid, page_addr); goto err_alloc_page_failed; } tmp_area.addr = page_addr; tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */; page_array_ptr = page; ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr); if (ret) { printk(KERN_ERR "binder: %d: binder_alloc_buf failed " "to map page at %p in kernel\n", proc->pid, page_addr); goto err_map_kernel_failed; } user_page_addr = (uintptr_t)page_addr + proc->user_buffer_offset; ret = vm_insert_page(vma, user_page_addr, page[0]); if (ret) { printk(KERN_ERR "binder: %d: binder_alloc_buf failed " "to map page at %lx in userspace\n", proc->pid, user_page_addr); goto err_vm_insert_page_failed; } /* vm_insert_page does not seem to increment the refcount */ } if (mm) { up_write(&mm->mmap_sem); mmput(mm); } return 0; free_range: for (page_addr = end - PAGE_SIZE; page_addr >= start; page_addr -= PAGE_SIZE) { page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE]; if (vma) zap_page_range(vma, (uintptr_t)page_addr + proc->user_buffer_offset, PAGE_SIZE, NULL); err_vm_insert_page_failed: unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE); err_map_kernel_failed: __free_page(*page); *page = NULL; err_alloc_page_failed: ; } err_no_vma: if (mm) { up_write(&mm->mmap_sem); mmput(mm); } return -ENOMEM; } static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc, size_t data_size, size_t offsets_size, int is_async) { struct rb_node *n = proc->free_buffers.rb_node; struct binder_buffer *buffer; size_t buffer_size; struct rb_node *best_fit = NULL; void *has_page_addr; void *end_page_addr; size_t size; if (proc->vma == NULL) { printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n", proc->pid); return NULL; } size = ALIGN(data_size, sizeof(void *)) + ALIGN(offsets_size, sizeof(void *)); if (size < data_size || size < offsets_size) { binder_user_error("binder: %d: got transaction with invalid " "size %zd-%zd\n", proc->pid, data_size, offsets_size); return NULL; } if (is_async && proc->free_async_space < size + sizeof(struct binder_buffer)) { binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "binder: %d: binder_alloc_buf size %zd" "failed, no async space left\n", proc->pid, size); return NULL; } while (n) { buffer = rb_entry(n, struct binder_buffer, rb_node); BUG_ON(!buffer->free); buffer_size = binder_buffer_size(proc, buffer); if (size < buffer_size) { best_fit = n; n = n->rb_left; } else if (size > buffer_size) n = n->rb_right; else { best_fit = n; break; } } if (best_fit == NULL) { printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, " "no address space\n", proc->pid, size); return NULL; } if (n == NULL) { buffer = rb_entry(best_fit, struct binder_buffer, rb_node); buffer_size = binder_buffer_size(proc, buffer); } binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "binder: %d: binder_alloc_buf size %zd got buff" "er %p size %zd\n", proc->pid, size, buffer, buffer_size); has_page_addr = (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK); if (n == NULL) { if (size + sizeof(struct binder_buffer) + 4 >= buffer_size) buffer_size = size; /* no room for other buffers */ else buffer_size = size + sizeof(struct binder_buffer); } end_page_addr = (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size); if (end_page_addr > has_page_addr) end_page_addr = has_page_addr; if (binder_update_page_range(proc, 1, (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL)) return NULL; rb_erase(best_fit, &proc->free_buffers); buffer->free = 0; binder_insert_allocated_buffer(proc, buffer); if (buffer_size != size) { struct binder_buffer *new_buffer = (void *)buffer->data + size; list_add(&new_buffer->entry, &buffer->entry); new_buffer->free = 1; binder_insert_free_buffer(proc, new_buffer); } binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "binder: %d: binder_alloc_buf size %zd got " "%p\n", proc->pid, size, buffer); buffer->data_size = data_size; buffer->offsets_size = offsets_size; buffer->async_transaction = is_async; if (is_async) { proc->free_async_space -= size + sizeof(struct binder_buffer); binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC, "binder: %d: binder_alloc_buf size %zd " "async free %zd\n", proc->pid, size, proc->free_async_space); } return buffer; } static void *buffer_start_page(struct binder_buffer *buffer) { return (void *)((uintptr_t)buffer & PAGE_MASK); } static void *buffer_end_page(struct binder_buffer *buffer) { return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK); } static void binder_delete_free_buffer(struct binder_proc *proc, struct binder_buffer *buffer) { struct binder_buffer *prev, *next = NULL; int free_page_end = 1; int free_page_start = 1; BUG_ON(proc->buffers.next == &buffer->entry); prev = list_entry(buffer->entry.prev, struct binder_buffer, entry); BUG_ON(!prev->free); if (buffer_end_page(prev) == buffer_start_page(buffer)) { free_page_start = 0; if (buffer_end_page(prev) == buffer_end_page(buffer)) free_page_end = 0; binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "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; binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "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) { binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "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 *)); binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "binder: %d: binder_free_buf %p size %zd buffer" "_size %zd\n", proc->pid, buffer, size, buffer_size); BUG_ON(buffer->free); BUG_ON(size > buffer_size); BUG_ON(buffer->transaction != NULL); BUG_ON((void *)buffer < proc->buffer); BUG_ON((void *)buffer > proc->buffer + proc->buffer_size); if (buffer->async_transaction) { proc->free_async_space += size + sizeof(struct binder_buffer); binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC, "binder: %d: binder_free_buf size %zd " "async free %zd\n", proc->pid, size, proc->free_async_space); } binder_update_page_range(proc, 0, (void *)PAGE_ALIGN((uintptr_t)buffer->data), (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK), NULL); rb_erase(&buffer->rb_node, &proc->allocated_buffers); buffer->free = 1; if (!list_is_last(&buffer->entry, &proc->buffers)) { struct binder_buffer *next = list_entry(buffer->entry.next, struct binder_buffer, entry); if (next->free) { rb_erase(&next->rb_node, &proc->free_buffers); binder_delete_free_buffer(proc, next); } } if (proc->buffers.next != &buffer->entry) { struct binder_buffer *prev = list_entry(buffer->entry.prev, struct binder_buffer, entry); if (prev->free) { binder_delete_free_buffer(proc, buffer); rb_erase(&prev->rb_node, &proc->free_buffers); buffer = prev; } } binder_insert_free_buffer(proc, buffer); } static struct binder_node *binder_get_node(struct binder_proc *proc, void __user *ptr) { struct rb_node *n = proc->nodes.rb_node; struct binder_node *node; while (n) { node = rb_entry(n, struct binder_node, rb_node); if (ptr < node->ptr) n = n->rb_left; else if (ptr > node->ptr) n = n->rb_right; else return node; } return NULL; } static struct binder_node *binder_new_node(struct binder_proc *proc, void __user *ptr, void __user *cookie) { struct rb_node **p = &proc->nodes.rb_node; struct rb_node *parent = NULL; struct binder_node *node; while (*p) { parent = *p; node = rb_entry(parent, struct binder_node, rb_node); if (ptr < node->ptr) p = &(*p)->rb_left; else if (ptr > node->ptr) p = &(*p)->rb_right; else return NULL; } node = kzalloc(sizeof(*node), GFP_KERNEL); if (node == NULL) return NULL; binder_stats_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); binder_debug(BINDER_DEBUG_INTERNAL_REFS, "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); binder_debug(BINDER_DEBUG_INTERNAL_REFS, "binder: refless node %d deleted\n", node->debug_id); } else { hlist_del(&node->dead_node); binder_debug(BINDER_DEBUG_INTERNAL_REFS, "binder: dead node %d deleted\n", node->debug_id); } kfree(node); binder_stats_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_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); binder_debug(BINDER_DEBUG_INTERNAL_REFS, "binder: %d new ref %d desc %d for " "node %d\n", proc->pid, new_ref->debug_id, new_ref->desc, node->debug_id); } else { binder_debug(BINDER_DEBUG_INTERNAL_REFS, "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) { binder_debug(BINDER_DEBUG_INTERNAL_REFS, "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) { binder_debug(BINDER_DEBUG_DEAD_BINDER, "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_deleted(BINDER_STAT_DEATH); } kfree(ref); binder_stats_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_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) { binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, "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; binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, "binder: send failed reply " "for transaction %d, target dead\n", t->debug_id); binder_pop_transaction(target_thread, t); if (next == NULL) { binder_debug(BINDER_DEBUG_DEAD_BINDER, "binder: reply failed," " no target thread at root\n"); return; } t = next; binder_debug(BINDER_DEBUG_DEAD_BINDER, "binder: reply failed, no target " "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) { size_t *offp, *off_end; int debug_id = buffer->debug_id; binder_debug(BINDER_DEBUG_TRANSACTION, "binder: %d buffer release %d, size %zd-%zd, failed at %p\n", proc->pid, buffer->debug_id, buffer->data_size, buffer->offsets_size, failed_at); if (buffer->target_node) binder_dec_node(buffer->target_node, 1, 0); offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *))); if (failed_at) off_end = failed_at; else off_end = (void *)offp + buffer->offsets_size; for (; offp < off_end; offp++) { struct flat_binder_object *fp; if (*offp > buffer->data_size - sizeof(*fp) || buffer->data_size < sizeof(*fp) || !IS_ALIGNED(*offp, sizeof(void *))) { printk(KERN_ERR "binder: transaction release %d bad" "offset %zd, size %zd\n", debug_id, *offp, buffer->data_size); continue; } fp = (struct flat_binder_object *)(buffer->data + *offp); switch (fp->type) { case BINDER_TYPE_BINDER: case BINDER_TYPE_WEAK_BINDER: { struct binder_node *node = binder_get_node(proc, fp->binder); if (node == NULL) { printk(KERN_ERR "binder: transaction release %d" " bad node %p\n", debug_id, fp->binder); break; } binder_debug(BINDER_DEBUG_TRANSACTION, " 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; } binder_debug(BINDER_DEBUG_TRANSACTION, " 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: binder_debug(BINDER_DEBUG_TRANSACTION, " fd %ld\n", fp->handle); if (failed_at) task_close_fd(proc, fp->handle); break; default: printk(KERN_ERR "binder: transaction release %d bad " "object type %lx\n", debug_id, fp->type); break; } } } 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; size_t off_min; 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 = BR_OK; 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 (security_binder_transaction(proc->tsk, target_proc->tsk) < 0) { return_error = BR_FAILED_REPLY; goto err_invalid_target_handle; } if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) { struct binder_transaction *tmp; tmp = thread->transaction_stack; if (tmp->to_thread != thread) { binder_user_error("binder: %d:%d got new " "transaction with bad transaction stack" ", transaction %d has target %d:%d\n", proc->pid, thread->pid, tmp->debug_id, tmp->to_proc ? tmp->to_proc->pid : 0, tmp->to_thread ? tmp->to_thread->pid : 0); return_error = BR_FAILED_REPLY; goto err_bad_call_stack; } while (tmp) { if (tmp->from && tmp->from->proc == target_proc) target_thread = tmp->from; tmp = tmp->from_parent; } } } if (target_thread) { e->to_thread = target_thread->pid; target_list = &target_thread->todo; target_wait = &target_thread->wait; } else { target_list = &target_proc->todo; target_wait = &target_proc->wait; } e->to_proc = target_proc->pid; /* TODO: reuse incoming transaction for reply */ t = kzalloc(sizeof(*t), GFP_KERNEL); if (t == NULL) { return_error = BR_FAILED_REPLY; goto err_alloc_t_failed; } binder_stats_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_created(BINDER_STAT_TRANSACTION_COMPLETE); t->debug_id = ++binder_last_id; e->debug_id = t->debug_id; if (reply) printk("binder: %d:%d BC_REPLY %d -> %d:%d, " "data %p-%p size %zd-%zd\n", proc->pid, thread->pid, t->debug_id, target_proc->pid, target_thread->pid, tr->data.ptr.buffer, tr->data.ptr.offsets, tr->data_size, tr->offsets_size); else printk("binder: %d:%d BC_TRANSACTION %d -> " "%d - node %d, data %p-%p size %zd-%zd\n", proc->pid, thread->pid, t->debug_id, target_proc->pid, target_node->debug_id, tr->data.ptr.buffer, tr->data.ptr.offsets, tr->data_size, tr->offsets_size); if (!reply && !(tr->flags & TF_ONE_WAY)) t->from = thread; else t->from = NULL; #if defined(CONFIG_MACH_P4NOTE) || defined(CONFIG_MACH_SP7160LTE) || defined(CONFIG_MACH_TAB3) || defined(CONFIG_MACH_KONA) /* workaround code for invalid binder proc */ if (!proc->tsk) { binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, "binder: %d:%d invalid proc\n", proc->pid, thread->pid); return_error = BR_FAILED_REPLY; goto err_binder_alloc_buf_failed; } #endif t->sender_euid = proc->tsk->cred->euid; t->to_proc = target_proc; t->to_thread = target_thread; t->code = tr->code; t->flags = tr->flags; t->priority = task_nice(current); t->buffer = binder_alloc_buf(target_proc, tr->data_size, tr->offsets_size, !reply && (t->flags & TF_ONE_WAY)); if (t->buffer == NULL) { return_error = BR_FAILED_REPLY; goto err_binder_alloc_buf_failed; } t->buffer->allow_user_free = 0; t->buffer->debug_id = t->debug_id; t->buffer->transaction = t; t->buffer->target_node = target_node; if (target_node) binder_inc_node(target_node, 1, 0, NULL); offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *))); if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) { binder_user_error("binder: %d:%d got transaction with invalid " "data ptr\n", proc->pid, thread->pid); return_error = BR_FAILED_REPLY; goto err_copy_data_failed; } /* print data: */ printk("%s (%d, %d), %s , print data :\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__); hexdump(t->buffer->data, tr->data_size); if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) { binder_user_error("binder: %d:%d got transaction with invalid " "offsets ptr\n", proc->pid, thread->pid); return_error = BR_FAILED_REPLY; goto err_copy_data_failed; } if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) { binder_user_error("binder: %d:%d got transaction with " "invalid offsets size, %zd\n", proc->pid, thread->pid, tr->offsets_size); return_error = BR_FAILED_REPLY; goto err_bad_offset; } off_end = (void *)offp + tr->offsets_size; off_min = 0; for (; offp < off_end; offp++) { struct flat_binder_object *fp; if (*offp > t->buffer->data_size - sizeof(*fp) || *offp < off_min || t->buffer->data_size < sizeof(*fp) || !IS_ALIGNED(*offp, sizeof(void *))) { binder_user_error("%d:%d got transaction with invalid offset, %zd (min %zd, max %zd)\n", proc->pid, thread->pid, *offp, off_min, (t->buffer->data_size - sizeof(*fp))); return_error = BR_FAILED_REPLY; goto err_bad_offset; } fp = (struct flat_binder_object *)(t->buffer->data + *offp); off_min = *offp + sizeof(struct flat_binder_object); 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; } if (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) { return_error = BR_FAILED_REPLY; 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); binder_debug(BINDER_DEBUG_TRANSACTION, " 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 (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) { 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); binder_debug(BINDER_DEBUG_TRANSACTION, " 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); binder_debug(BINDER_DEBUG_TRANSACTION, " 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; } if (security_binder_transfer_file(proc->tsk, target_proc->tsk, file) < 0) { fput(file); return_error = BR_FAILED_REPLY; goto err_get_unused_fd_failed; } target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC); if (target_fd < 0) { fput(file); return_error = BR_FAILED_REPLY; goto err_get_unused_fd_failed; } task_fd_install(target_proc, target_fd, file); binder_debug(BINDER_DEBUG_TRANSACTION, " 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_deleted(BINDER_STAT_TRANSACTION_COMPLETE); err_alloc_tcomplete_failed: kfree(t); binder_stats_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: binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, "binder: %d:%d transaction failed %d, size %zd-%zd\n", proc->pid, thread->pid, return_error, tr->data_size, tr->offsets_size); { struct binder_transaction_log_entry *fe; fe = binder_transaction_log_add(&binder_transaction_log_failed); *fe = *e; } BUG_ON(thread->return_error != BR_OK); if (in_reply_to) { thread->return_error = BR_TRANSACTION_COMPLETE; binder_send_failed_reply(in_reply_to, return_error); } else thread->return_error = return_error; } 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)]++; } /* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(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; } binder_debug(BINDER_DEBUG_USER_REFS, "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); binder_debug(BINDER_DEBUG_USER_REFS, "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; } binder_debug(BINDER_DEBUG_FREE_BUFFER, "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: binder_debug(BINDER_DEBUG_THREADS, "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: binder_debug(BINDER_DEBUG_THREADS, "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: binder_debug(BINDER_DEBUG_THREADS, "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; } binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION, "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; binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, "binder: %d:%d " "BC_REQUEST_DEATH_NOTIFICATION failed\n", proc->pid, thread->pid); break; } binder_stats_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; } } binder_debug(BINDER_DEBUG_DEAD_BINDER, "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) { /* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(BR_NOOP)); 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++; binder_unlock(__func__); 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)); } binder_lock(__func__); 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; /* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(cmd)); if (put_user(cmd, (uint32_t __user *)ptr)) return -EFAULT; ptr += sizeof(uint32_t); binder_stat_br(proc, thread, cmd); binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE, "binder: %d:%d BR_TRANSACTION_COMPLETE\n", proc->pid, thread->pid); list_del(&w->entry); kfree(w); binder_stats_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) { /* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(cmd)); 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); binder_debug(BINDER_DEBUG_USER_REFS, "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) { binder_debug(BINDER_DEBUG_INTERNAL_REFS, "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_deleted(BINDER_STAT_NODE); } else { binder_debug(BINDER_DEBUG_INTERNAL_REFS, "binder: %d:%d node %d u%p c%p state unchanged\n", proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie); } } } break; case BINDER_WORK_DEAD_BINDER: case BINDER_WORK_DEAD_BINDER_AND_CLEAR: case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: { struct binder_ref_death *death; uint32_t cmd; death = container_of(w, struct binder_ref_death, work); if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE; else cmd = BR_DEAD_BINDER; /* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(cmd)); 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 *); binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION, "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_deleted(BINDER_STAT_DEATH); } else list_move(&w->entry, &proc->delivered_death); if (cmd == BR_DEAD_BINDER) goto done; /* DEAD_BINDER notifications can cause transactions */ } break; } if (!t) continue; BUG_ON(t->buffer == NULL); if (t->buffer->target_node) { struct binder_node *target_node = t->buffer->target_node; tr.target.ptr = target_node->ptr; tr.cookie = target_node->cookie; t->saved_priority = task_nice(current); if (t->priority < target_node->min_priority && !(t->flags & TF_ONE_WAY)) binder_set_nice(t->priority); else if (!(t->flags & TF_ONE_WAY) || t->saved_priority > target_node->min_priority) binder_set_nice(target_node->min_priority); cmd = BR_TRANSACTION; } else { tr.target.ptr = NULL; tr.cookie = NULL; cmd = BR_REPLY; } tr.code = t->code; tr.flags = t->flags; tr.sender_euid = t->sender_euid; if (t->from) { struct task_struct *sender = t->from->proc->tsk; tr.sender_pid = task_tgid_nr_ns(sender, current->nsproxy->pid_ns); } else { tr.sender_pid = 0; } tr.data_size = t->buffer->data_size; tr.offsets_size = t->buffer->offsets_size; tr.data.ptr.buffer = (void *)t->buffer->data + proc->user_buffer_offset; tr.data.ptr.offsets = tr.data.ptr.buffer + ALIGN(t->buffer->data_size, sizeof(void *)); /* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(cmd)); /* print data: */ printk("%s (%d, %d), %s , print data :\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__); hexdump(t->buffer->data, tr.data_size); 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); binder_debug(BINDER_DEBUG_TRANSACTION, "binder: %d:%d %s %d %d:%d, cmd %d" "size %zd-%zd ptr %p-%p\n", proc->pid, thread->pid, (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" : "BR_REPLY", t->debug_id, t->from ? t->from->proc->pid : 0, t->from ? t->from->pid : 0, cmd, t->buffer->data_size, t->buffer->offsets_size, tr.data.ptr.buffer, tr.data.ptr.offsets); list_del(&t->work.entry); t->buffer->allow_user_free = 1; if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) { t->to_parent = thread->transaction_stack; t->to_thread = thread; thread->transaction_stack = t; } else { t->buffer->transaction = NULL; kfree(t); binder_stats_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++; binder_debug(BINDER_DEBUG_THREADS, "binder: %d:%d BR_SPAWN_LOOPER\n", proc->pid, thread->pid); /* print info: proc‘name, proc id, thread id, cmd‘name */ printk("%s (%d, %d), %s : %s\n", proc->tsk->comm, proc->pid, thread->pid, __FUNCTION__, binder_cmd_name(BR_SPAWN_LOOPER)); if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer)) return -EFAULT; } return 0; } static void binder_release_work(struct list_head *list) { struct binder_work *w; while (!list_empty(list)) { w = list_first_entry(list, struct binder_work, entry); list_del_init(&w->entry); switch (w->type) { case BINDER_WORK_TRANSACTION: { struct binder_transaction *t; t = container_of(w, struct binder_transaction, work); if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) { binder_send_failed_reply(t, BR_DEAD_REPLY); } else { binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, "binder: undelivered transaction %d\n", t->debug_id); t->buffer->transaction = NULL; kfree(t); binder_stats_deleted(BINDER_STAT_TRANSACTION); } } break; case BINDER_WORK_TRANSACTION_COMPLETE: { binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, "binder: undelivered TRANSACTION_COMPLETE\n"); kfree(w); binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); } break; case BINDER_WORK_DEAD_BINDER_AND_CLEAR: case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: { struct binder_ref_death *death; death = container_of(w, struct binder_ref_death, work); binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, "binder: undelivered death notification, %p\n", death->cookie); kfree(death); binder_stats_deleted(BINDER_STAT_DEATH); } break; default: pr_err("binder: unexpected work type, %d, not freed\n", w->type); 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_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++; binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, "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_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; binder_lock(__func__); thread = binder_get_thread(proc); wait_for_proc_work = thread->transaction_stack == NULL && list_empty(&thread->todo) && thread->return_error == BR_OK; binder_unlock(__func__); 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; binder_lock(__func__); 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; } binder_debug(BINDER_DEBUG_READ_WRITE, "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; } } binder_debug(BINDER_DEBUG_READ_WRITE, "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; } ret = security_binder_set_context_mgr(proc->tsk); if (ret < 0) goto err; if (binder_context_mgr_uid != -1) { if (binder_context_mgr_uid != current->cred->euid) { printk(KERN_ERR "binder: BINDER_SET_" "CONTEXT_MGR bad uid %d != %d\n", current->cred->euid, binder_context_mgr_uid); ret = -EPERM; goto err; } } else binder_context_mgr_uid = current->cred->euid; binder_context_mgr_node = binder_new_node(proc, NULL, NULL); if (binder_context_mgr_node == NULL) { ret = -ENOMEM; goto err; } binder_context_mgr_node->local_weak_refs++; binder_context_mgr_node->local_strong_refs++; binder_context_mgr_node->has_strong_ref = 1; binder_context_mgr_node->has_weak_ref = 1; break; case BINDER_THREAD_EXIT: binder_debug(BINDER_DEBUG_THREADS, "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; binder_unlock(__func__); 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; binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, (unsigned long)pgprot_val(vma->vm_page_prot)); } static void binder_vma_close(struct vm_area_struct *vma) { struct binder_proc *proc = vma->vm_private_data; binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, (unsigned long)pgprot_val(vma->vm_page_prot)); proc->vma = NULL; proc->vma_vm_mm = NULL; binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES); } static struct vm_operations_struct binder_vm_ops = { .open = binder_vma_open, .close = binder_vma_close, }; static int binder_mmap(struct file *filp, struct vm_area_struct *vma) { int ret; struct vm_struct *area; struct binder_proc *proc = filp->private_data; const char *failure_string; struct binder_buffer *buffer; if ((vma->vm_end - vma->vm_start) > SZ_4M) vma->vm_end = vma->vm_start + SZ_4M; binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, (unsigned long)pgprot_val(vma->vm_page_prot)); if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) { ret = -EPERM; failure_string = "bad vm_flags"; goto err_bad_arg; } vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE; mutex_lock(&binder_mmap_lock); if (proc->buffer) { ret = -EBUSY; failure_string = "already mapped"; goto err_already_mapped; } area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP); if (area == NULL) { ret = -ENOMEM; failure_string = "get_vm_area"; goto err_get_vm_area_failed; } proc->buffer = area->addr; proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer; mutex_unlock(&binder_mmap_lock); #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 =http://www.mamicode.com/ proc; if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) { ret = -ENOMEM; failure_string = "alloc small buf"; goto err_alloc_small_buf_failed; } buffer = proc->buffer; INIT_LIST_HEAD(&proc->buffers); list_add(&buffer->entry, &proc->buffers); buffer->free = 1; binder_insert_free_buffer(proc, buffer); proc->free_async_space = proc->buffer_size / 2; barrier(); proc->files = get_files_struct(proc->tsk); proc->vma = vma; proc->vma_vm_mm = vma->vm_mm; /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/ return 0; err_alloc_small_buf_failed: kfree(proc->pages); proc->pages = NULL; err_alloc_pages_failed: mutex_lock(&binder_mmap_lock); vfree(proc->buffer); proc->buffer = NULL; err_get_vm_area_failed: err_already_mapped: mutex_unlock(&binder_mmap_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; binder_debug(BINDER_DEBUG_OPEN_CLOSE, "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); binder_lock(__func__); binder_stats_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 =http://www.mamicode.com/ proc; binder_unlock(__func__); if (binder_debugfs_dir_entry_proc) { char strbuf[11]; snprintf(strbuf, sizeof(strbuf), "%u", proc->pid); proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO, binder_debugfs_dir_entry_proc, proc, &binder_proc_fops); } return 0; } static int binder_flush(struct file *filp, fl_owner_t id) { struct binder_proc *proc = filp->private_data; binder_defer_work(proc, BINDER_DEFERRED_FLUSH); return 0; } static void binder_deferred_flush(struct binder_proc *proc) { struct rb_node *n; int wake_count = 0; for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) { struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node); thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN; if (thread->looper & BINDER_LOOPER_STATE_WAITING) { wake_up_interruptible(&thread->wait); wake_count++; } } wake_up_interruptible_all(&proc->wait); binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_flush: %d woke %d threads\n", proc->pid, wake_count); } static int binder_release(struct inode *nodp, struct file *filp) { struct binder_proc *proc = filp->private_data; debugfs_remove(proc->debugfs_entry); binder_defer_work(proc, BINDER_DEFERRED_RELEASE); return 0; } static void binder_deferred_release(struct binder_proc *proc) { struct hlist_node *pos; struct binder_transaction *t; struct rb_node *n; int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count; BUG_ON(proc->vma); BUG_ON(proc->files); hlist_del(&proc->proc_node); if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) { binder_debug(BINDER_DEBUG_DEAD_BINDER, "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); binder_release_work(&node->async_todo); if (hlist_empty(&node->refs)) { kfree(node); binder_stats_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(); } } binder_debug(BINDER_DEBUG_DEAD_BINDER, "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); binder_release_work(&proc->delivered_death); 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_deleted(BINDER_STAT_PROC); page_count = 0; if (proc->pages) { int i; for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) { if (proc->pages[i]) { void *page_addr = proc->buffer + i * PAGE_SIZE; unsigned long page_ptr = (unsigned long)proc->pages[i]; binder_debug(BINDER_DEBUG_BUFFER_ALLOC, "binder_release: %d: " "page %d at %p not freed\n", proc->pid, i, page_addr); unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE); if (unlikely(!IS_ALIGNED(page_ptr, 4) || page_ptr < PAGE_OFFSET || page_ptr >= (unsigned long)high_memory)) printk(KERN_ERR "binder_release: %d: " "page %d addr %p is invalid\n", proc->pid, i, proc->pages[i]); else { __free_page(proc->pages[i]); page_count++; } } } kfree(proc->pages); vfree(proc->buffer); } put_task_struct(proc->tsk); binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_release: %d threads %d, nodes %d (ref %d), " "refs %d, active transactions %d, buffers %d, " "pages %d\n", proc->pid, threads, nodes, incoming_refs, outgoing_refs, active_transactions, buffers, page_count); kfree(proc); } static void binder_deferred_func(struct work_struct *work) { struct binder_proc *proc; struct files_struct *files; int defer; do { binder_lock(__func__); mutex_lock(&binder_deferred_lock); if (!hlist_empty(&binder_deferred_list)) { proc = hlist_entry(binder_deferred_list.first, struct binder_proc, deferred_work_node); hlist_del_init(&proc->deferred_work_node); defer = proc->deferred_work; proc->deferred_work = 0; } else { proc = NULL; defer = 0; } mutex_unlock(&binder_deferred_lock); files = NULL; if (defer & BINDER_DEFERRED_PUT_FILES) { files = proc->files; if (files) proc->files = NULL; } if (defer & BINDER_DEFERRED_FLUSH) binder_deferred_flush(proc); if (defer & BINDER_DEFERRED_RELEASE) binder_deferred_release(proc); /* frees proc */ binder_unlock(__func__); if (files) put_files_struct(files); } while (proc); } static DECLARE_WORK(binder_deferred_work, binder_deferred_func); static void binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer) { mutex_lock(&binder_deferred_lock); proc->deferred_work |= defer; if (hlist_unhashed(&proc->deferred_work_node)) { hlist_add_head(&proc->deferred_work_node, &binder_deferred_list); queue_work(binder_deferred_workqueue, &binder_deferred_work); } mutex_unlock(&binder_deferred_lock); } static void print_binder_transaction(struct seq_file *m, const char *prefix, struct binder_transaction *t) { seq_printf(m, "%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 (t->buffer == NULL) { seq_puts(m, " buffer free\n"); return; } if (t->buffer->target_node) seq_printf(m, " node %d", t->buffer->target_node->debug_id); seq_printf(m, " size %zd:%zd data %p\n", t->buffer->data_size, t->buffer->offsets_size, t->buffer->data); } static void print_binder_buffer(struct seq_file *m, const char *prefix, struct binder_buffer *buffer) { seq_printf(m, "%s %d: %p size %zd:%zd %s\n", prefix, buffer->debug_id, buffer->data, buffer->data_size, buffer->offsets_size, buffer->transaction ? "active" : "delivered"); } static void print_binder_work(struct seq_file *m, 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); print_binder_transaction(m, transaction_prefix, t); break; case BINDER_WORK_TRANSACTION_COMPLETE: seq_printf(m, "%stransaction complete\n", prefix); break; case BINDER_WORK_NODE: node = container_of(w, struct binder_node, work); seq_printf(m, "%snode work %d: u%p c%p\n", prefix, node->debug_id, node->ptr, node->cookie); break; case BINDER_WORK_DEAD_BINDER: seq_printf(m, "%shas dead binder\n", prefix); break; case BINDER_WORK_DEAD_BINDER_AND_CLEAR: seq_printf(m, "%shas cleared dead binder\n", prefix); break; case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: seq_printf(m, "%shas cleared death notification\n", prefix); break; default: seq_printf(m, "%sunknown work: type %d\n", prefix, w->type); break; } } static void print_binder_thread(struct seq_file *m, struct binder_thread *thread, int print_always) { struct binder_transaction *t; struct binder_work *w; size_t start_pos = m->count; size_t header_pos; seq_printf(m, " thread %d: l %02x\n", thread->pid, thread->looper); header_pos = m->count; t = thread->transaction_stack; while (t) { if (t->from == thread) { print_binder_transaction(m, " outgoing transaction", t); t = t->from_parent; } else if (t->to_thread == thread) { print_binder_transaction(m, " incoming transaction", t); t = t->to_parent; } else { print_binder_transaction(m, " bad transaction", t); t = NULL; } } list_for_each_entry(w, &thread->todo, entry) { print_binder_work(m, " ", " pending transaction", w); } if (!print_always && m->count == header_pos) m->count = start_pos; } static void print_binder_node(struct seq_file *m, 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++; seq_printf(m, " 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 (count) { seq_puts(m, " proc"); hlist_for_each_entry(ref, pos, &node->refs, node_entry) seq_printf(m, " %d", ref->proc->pid); } seq_puts(m, "\n"); list_for_each_entry(w, &node->async_todo, entry) print_binder_work(m, " ", " pending async transaction", w); } static void print_binder_ref(struct seq_file *m, struct binder_ref *ref) { seq_printf(m, " 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); } static void print_binder_proc(struct seq_file *m, struct binder_proc *proc, int print_all) { struct binder_work *w; struct rb_node *n; size_t start_pos = m->count; size_t header_pos; seq_printf(m, "proc %d\n", proc->pid); header_pos = m->count; for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) print_binder_thread(m, rb_entry(n, struct binder_thread, rb_node), print_all); for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) { struct binder_node *node = rb_entry(n, struct binder_node, rb_node); if (print_all || node->has_async_transaction) print_binder_node(m, node); } if (print_all) { for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) print_binder_ref(m, rb_entry(n, struct binder_ref, rb_node_desc)); } for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n)) print_binder_buffer(m, " buffer", rb_entry(n, struct binder_buffer, rb_node)); list_for_each_entry(w, &proc->todo, entry) print_binder_work(m, " ", " pending transaction", w); list_for_each_entry(w, &proc->delivered_death, entry) { seq_puts(m, " has delivered dead binder\n"); break; } if (!print_all && m->count == header_pos) m->count = start_pos; } 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 void print_binder_stats(struct seq_file *m, 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]) seq_printf(m, "%s%s: %d\n", prefix, binder_command_strings[i], stats->bc[i]); } 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]) seq_printf(m, "%s%s: %d\n", prefix, binder_return_strings[i], stats->br[i]); } 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]) seq_printf(m, "%s%s: active %d total %d\n", prefix, binder_objstat_strings[i], stats->obj_created[i] - stats->obj_deleted[i], stats->obj_created[i]); } } static void print_binder_proc_stats(struct seq_file *m, struct binder_proc *proc) { struct binder_work *w; struct rb_node *n; int count, strong, weak; seq_printf(m, "proc %d\n", proc->pid); count = 0; for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) count++; seq_printf(m, " threads: %d\n", count); seq_printf(m, " requested threads: %d+%d/%d\n" " ready threads %d\n" " free async space %zd\n", proc->requested_threads, proc->requested_threads_started, proc->max_threads, proc->ready_threads, proc->free_async_space); count = 0; for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) count++; seq_printf(m, " nodes: %d\n", count); 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; } seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak); count = 0; for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n)) count++; seq_printf(m, " buffers: %d\n", count); count = 0; list_for_each_entry(w, &proc->todo, entry) { switch (w->type) { case BINDER_WORK_TRANSACTION: count++; break; default: break; } } seq_printf(m, " pending transactions: %d\n", count); print_binder_stats(m, " ", &proc->stats); } static int binder_state_show(struct seq_file *m, void *unused) { struct binder_proc *proc; struct hlist_node *pos; struct binder_node *node; int do_lock = !binder_debug_no_lock; if (do_lock) binder_lock(__func__); seq_puts(m, "binder state:\n"); if (!hlist_empty(&binder_dead_nodes)) seq_puts(m, "dead nodes:\n"); hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) print_binder_node(m, node); hlist_for_each_entry(proc, pos, &binder_procs, proc_node) print_binder_proc(m, proc, 1); if (do_lock) binder_unlock(__func__); return 0; } static int binder_stats_show(struct seq_file *m, void *unused) { struct binder_proc *proc; struct hlist_node *pos; int do_lock = !binder_debug_no_lock; if (do_lock) binder_lock(__func__); seq_puts(m, "binder stats:\n"); print_binder_stats(m, "", &binder_stats); hlist_for_each_entry(proc, pos, &binder_procs, proc_node) print_binder_proc_stats(m, proc); if (do_lock) binder_unlock(__func__); return 0; } static int binder_transactions_show(struct seq_file *m, void *unused) { struct binder_proc *proc; struct hlist_node *pos; int do_lock = !binder_debug_no_lock; if (do_lock) binder_lock(__func__); seq_puts(m, "binder transactions:\n"); hlist_for_each_entry(proc, pos, &binder_procs, proc_node) print_binder_proc(m, proc, 0); if (do_lock) binder_unlock(__func__); return 0; } static int binder_proc_show(struct seq_file *m, void *unused) { struct binder_proc *proc = m->private; int do_lock = !binder_debug_no_lock; if (do_lock) binder_lock(__func__); seq_puts(m, "binder proc state:\n"); print_binder_proc(m, proc, 1); if (do_lock) binder_unlock(__func__); return 0; } static void print_binder_transaction_log_entry(struct seq_file *m, struct binder_transaction_log_entry *e) { seq_printf(m, "%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); } static int binder_transaction_log_show(struct seq_file *m, void *unused) { struct binder_transaction_log *log = m->private; int i; if (log->full) { for (i = log->next; i < ARRAY_SIZE(log->entry); i++) print_binder_transaction_log_entry(m, &log->entry[i]); } for (i = 0; i < log->next; i++) print_binder_transaction_log_entry(m, &log->entry[i]); return 0; } static const struct file_operations binder_fops = { .owner = THIS_MODULE, .poll = binder_poll, .unlocked_ioctl = binder_ioctl, .mmap = binder_mmap, .open = binder_open, .flush = binder_flush, .release = binder_release, }; static struct miscdevice binder_miscdev = { .minor = MISC_DYNAMIC_MINOR, .name = "binder", .fops = &binder_fops }; BINDER_DEBUG_ENTRY(state); BINDER_DEBUG_ENTRY(stats); BINDER_DEBUG_ENTRY(transactions); BINDER_DEBUG_ENTRY(transaction_log); static int __init binder_init(void) { int ret; binder_deferred_workqueue = create_singlethread_workqueue("binder"); if (!binder_deferred_workqueue) return -ENOMEM; binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL); if (binder_debugfs_dir_entry_root) binder_debugfs_dir_entry_proc = debugfs_create_dir("proc", binder_debugfs_dir_entry_root); ret = misc_register(&binder_miscdev); if (binder_debugfs_dir_entry_root) { debugfs_create_file("state", S_IRUGO, binder_debugfs_dir_entry_root, NULL, &binder_state_fops); debugfs_create_file("stats", S_IRUGO, binder_debugfs_dir_entry_root, NULL, &binder_stats_fops); debugfs_create_file("transactions", S_IRUGO, binder_debugfs_dir_entry_root, NULL, &binder_transactions_fops); debugfs_create_file("transaction_log", S_IRUGO, binder_debugfs_dir_entry_root, &binder_transaction_log, &binder_transaction_log_fops); debugfs_create_file("failed_transaction_log", S_IRUGO, binder_debugfs_dir_entry_root, &binder_transaction_log_failed, &binder_transaction_log_fops); } return ret; } device_initcall(binder_init); MODULE_LICENSE("GPL v2");
第6课第2节_Binder系统_驱动情景分析_打印数据交互过程
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