Staging: android: binder: Fix crashes when sharing a binder file between processes
[linux-2.6.git] / drivers / staging / android / binder.c
1 /* binder.c
2  *
3  * Android IPC Subsystem
4  *
5  * Copyright (C) 2007-2008 Google, Inc.
6  *
7  * This software is licensed under the terms of the GNU General Public
8  * License version 2, as published by the Free Software Foundation, and
9  * may be copied, distributed, and modified under those terms.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  */
17
18 #include <asm/cacheflush.h>
19 #include <linux/fdtable.h>
20 #include <linux/file.h>
21 #include <linux/fs.h>
22 #include <linux/list.h>
23 #include <linux/miscdevice.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/mutex.h>
27 #include <linux/nsproxy.h>
28 #include <linux/poll.h>
29 #include <linux/debugfs.h>
30 #include <linux/rbtree.h>
31 #include <linux/sched.h>
32 #include <linux/seq_file.h>
33 #include <linux/uaccess.h>
34 #include <linux/vmalloc.h>
35 #include <linux/slab.h>
36
37 #include "binder.h"
38
39 static DEFINE_MUTEX(binder_lock);
40 static DEFINE_MUTEX(binder_deferred_lock);
41 static DEFINE_MUTEX(binder_mmap_lock);
42
43 static HLIST_HEAD(binder_procs);
44 static HLIST_HEAD(binder_deferred_list);
45 static HLIST_HEAD(binder_dead_nodes);
46
47 static struct dentry *binder_debugfs_dir_entry_root;
48 static struct dentry *binder_debugfs_dir_entry_proc;
49 static struct binder_node *binder_context_mgr_node;
50 static uid_t binder_context_mgr_uid = -1;
51 static int binder_last_id;
52 static struct workqueue_struct *binder_deferred_workqueue;
53
54 #define BINDER_DEBUG_ENTRY(name) \
55 static int binder_##name##_open(struct inode *inode, struct file *file) \
56 { \
57         return single_open(file, binder_##name##_show, inode->i_private); \
58 } \
59 \
60 static const struct file_operations binder_##name##_fops = { \
61         .owner = THIS_MODULE, \
62         .open = binder_##name##_open, \
63         .read = seq_read, \
64         .llseek = seq_lseek, \
65         .release = single_release, \
66 }
67
68 static int binder_proc_show(struct seq_file *m, void *unused);
69 BINDER_DEBUG_ENTRY(proc);
70
71 /* This is only defined in include/asm-arm/sizes.h */
72 #ifndef SZ_1K
73 #define SZ_1K                               0x400
74 #endif
75
76 #ifndef SZ_4M
77 #define SZ_4M                               0x400000
78 #endif
79
80 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
81
82 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
83
84 enum {
85         BINDER_DEBUG_USER_ERROR             = 1U << 0,
86         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
87         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
88         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
89         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
90         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
91         BINDER_DEBUG_READ_WRITE             = 1U << 6,
92         BINDER_DEBUG_USER_REFS              = 1U << 7,
93         BINDER_DEBUG_THREADS                = 1U << 8,
94         BINDER_DEBUG_TRANSACTION            = 1U << 9,
95         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
96         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
97         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
98         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
99         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
100         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
101 };
102 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
103         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
104 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
105
106 static int binder_debug_no_lock;
107 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
108
109 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
110 static int binder_stop_on_user_error;
111
112 static int binder_set_stop_on_user_error(const char *val,
113                                          struct kernel_param *kp)
114 {
115         int ret;
116         ret = param_set_int(val, kp);
117         if (binder_stop_on_user_error < 2)
118                 wake_up(&binder_user_error_wait);
119         return ret;
120 }
121 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
122         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
123
124 #define binder_debug(mask, x...) \
125         do { \
126                 if (binder_debug_mask & mask) \
127                         printk(KERN_INFO x); \
128         } while (0)
129
130 #define binder_user_error(x...) \
131         do { \
132                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
133                         printk(KERN_INFO x); \
134                 if (binder_stop_on_user_error) \
135                         binder_stop_on_user_error = 2; \
136         } while (0)
137
138 enum binder_stat_types {
139         BINDER_STAT_PROC,
140         BINDER_STAT_THREAD,
141         BINDER_STAT_NODE,
142         BINDER_STAT_REF,
143         BINDER_STAT_DEATH,
144         BINDER_STAT_TRANSACTION,
145         BINDER_STAT_TRANSACTION_COMPLETE,
146         BINDER_STAT_COUNT
147 };
148
149 struct binder_stats {
150         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
151         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
152         int obj_created[BINDER_STAT_COUNT];
153         int obj_deleted[BINDER_STAT_COUNT];
154 };
155
156 static struct binder_stats binder_stats;
157
158 static inline void binder_stats_deleted(enum binder_stat_types type)
159 {
160         binder_stats.obj_deleted[type]++;
161 }
162
163 static inline void binder_stats_created(enum binder_stat_types type)
164 {
165         binder_stats.obj_created[type]++;
166 }
167
168 struct binder_transaction_log_entry {
169         int debug_id;
170         int call_type;
171         int from_proc;
172         int from_thread;
173         int target_handle;
174         int to_proc;
175         int to_thread;
176         int to_node;
177         int data_size;
178         int offsets_size;
179 };
180 struct binder_transaction_log {
181         int next;
182         int full;
183         struct binder_transaction_log_entry entry[32];
184 };
185 static struct binder_transaction_log binder_transaction_log;
186 static struct binder_transaction_log binder_transaction_log_failed;
187
188 static struct binder_transaction_log_entry *binder_transaction_log_add(
189         struct binder_transaction_log *log)
190 {
191         struct binder_transaction_log_entry *e;
192         e = &log->entry[log->next];
193         memset(e, 0, sizeof(*e));
194         log->next++;
195         if (log->next == ARRAY_SIZE(log->entry)) {
196                 log->next = 0;
197                 log->full = 1;
198         }
199         return e;
200 }
201
202 struct binder_work {
203         struct list_head entry;
204         enum {
205                 BINDER_WORK_TRANSACTION = 1,
206                 BINDER_WORK_TRANSACTION_COMPLETE,
207                 BINDER_WORK_NODE,
208                 BINDER_WORK_DEAD_BINDER,
209                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
210                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
211         } type;
212 };
213
214 struct binder_node {
215         int debug_id;
216         struct binder_work work;
217         union {
218                 struct rb_node rb_node;
219                 struct hlist_node dead_node;
220         };
221         struct binder_proc *proc;
222         struct hlist_head refs;
223         int internal_strong_refs;
224         int local_weak_refs;
225         int local_strong_refs;
226         void __user *ptr;
227         void __user *cookie;
228         unsigned has_strong_ref:1;
229         unsigned pending_strong_ref:1;
230         unsigned has_weak_ref:1;
231         unsigned pending_weak_ref:1;
232         unsigned has_async_transaction:1;
233         unsigned accept_fds:1;
234         unsigned min_priority:8;
235         struct list_head async_todo;
236 };
237
238 struct binder_ref_death {
239         struct binder_work work;
240         void __user *cookie;
241 };
242
243 struct binder_ref {
244         /* Lookups needed: */
245         /*   node + proc => ref (transaction) */
246         /*   desc + proc => ref (transaction, inc/dec ref) */
247         /*   node => refs + procs (proc exit) */
248         int debug_id;
249         struct rb_node rb_node_desc;
250         struct rb_node rb_node_node;
251         struct hlist_node node_entry;
252         struct binder_proc *proc;
253         struct binder_node *node;
254         uint32_t desc;
255         int strong;
256         int weak;
257         struct binder_ref_death *death;
258 };
259
260 struct binder_buffer {
261         struct list_head entry; /* free and allocated entries by addesss */
262         struct rb_node rb_node; /* free entry by size or allocated entry */
263                                 /* by address */
264         unsigned free:1;
265         unsigned allow_user_free:1;
266         unsigned async_transaction:1;
267         unsigned debug_id:29;
268
269         struct binder_transaction *transaction;
270
271         struct binder_node *target_node;
272         size_t data_size;
273         size_t offsets_size;
274         uint8_t data[0];
275 };
276
277 enum binder_deferred_state {
278         BINDER_DEFERRED_PUT_FILES    = 0x01,
279         BINDER_DEFERRED_FLUSH        = 0x02,
280         BINDER_DEFERRED_RELEASE      = 0x04,
281 };
282
283 struct binder_proc {
284         struct hlist_node proc_node;
285         struct rb_root threads;
286         struct rb_root nodes;
287         struct rb_root refs_by_desc;
288         struct rb_root refs_by_node;
289         int pid;
290         struct vm_area_struct *vma;
291         struct task_struct *tsk;
292         struct files_struct *files;
293         struct hlist_node deferred_work_node;
294         int deferred_work;
295         void *buffer;
296         ptrdiff_t user_buffer_offset;
297
298         struct list_head buffers;
299         struct rb_root free_buffers;
300         struct rb_root allocated_buffers;
301         size_t free_async_space;
302
303         struct page **pages;
304         size_t buffer_size;
305         uint32_t buffer_free;
306         struct list_head todo;
307         wait_queue_head_t wait;
308         struct binder_stats stats;
309         struct list_head delivered_death;
310         int max_threads;
311         int requested_threads;
312         int requested_threads_started;
313         int ready_threads;
314         long default_priority;
315         struct dentry *debugfs_entry;
316 };
317
318 enum {
319         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
320         BINDER_LOOPER_STATE_ENTERED     = 0x02,
321         BINDER_LOOPER_STATE_EXITED      = 0x04,
322         BINDER_LOOPER_STATE_INVALID     = 0x08,
323         BINDER_LOOPER_STATE_WAITING     = 0x10,
324         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
325 };
326
327 struct binder_thread {
328         struct binder_proc *proc;
329         struct rb_node rb_node;
330         int pid;
331         int looper;
332         struct binder_transaction *transaction_stack;
333         struct list_head todo;
334         uint32_t return_error; /* Write failed, return error code in read buf */
335         uint32_t return_error2; /* Write failed, return error code in read */
336                 /* buffer. Used when sending a reply to a dead process that */
337                 /* we are also waiting on */
338         wait_queue_head_t wait;
339         struct binder_stats stats;
340 };
341
342 struct binder_transaction {
343         int debug_id;
344         struct binder_work work;
345         struct binder_thread *from;
346         struct binder_transaction *from_parent;
347         struct binder_proc *to_proc;
348         struct binder_thread *to_thread;
349         struct binder_transaction *to_parent;
350         unsigned need_reply:1;
351         /* unsigned is_dead:1; */       /* not used at the moment */
352
353         struct binder_buffer *buffer;
354         unsigned int    code;
355         unsigned int    flags;
356         long    priority;
357         long    saved_priority;
358         uid_t   sender_euid;
359 };
360
361 static void
362 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
363
364 /*
365  * copied from get_unused_fd_flags
366  */
367 int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
368 {
369         struct files_struct *files = proc->files;
370         int fd, error;
371         struct fdtable *fdt;
372         unsigned long rlim_cur;
373         unsigned long irqs;
374
375         if (files == NULL)
376                 return -ESRCH;
377
378         error = -EMFILE;
379         spin_lock(&files->file_lock);
380
381 repeat:
382         fdt = files_fdtable(files);
383         fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
384                                 files->next_fd);
385
386         /*
387          * N.B. For clone tasks sharing a files structure, this test
388          * will limit the total number of files that can be opened.
389          */
390         rlim_cur = 0;
391         if (lock_task_sighand(proc->tsk, &irqs)) {
392                 rlim_cur = proc->tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
393                 unlock_task_sighand(proc->tsk, &irqs);
394         }
395         if (fd >= rlim_cur)
396                 goto out;
397
398         /* Do we need to expand the fd array or fd set?  */
399         error = expand_files(files, fd);
400         if (error < 0)
401                 goto out;
402
403         if (error) {
404                 /*
405                  * If we needed to expand the fs array we
406                  * might have blocked - try again.
407                  */
408                 error = -EMFILE;
409                 goto repeat;
410         }
411
412         FD_SET(fd, fdt->open_fds);
413         if (flags & O_CLOEXEC)
414                 FD_SET(fd, fdt->close_on_exec);
415         else
416                 FD_CLR(fd, fdt->close_on_exec);
417         files->next_fd = fd + 1;
418 #if 1
419         /* Sanity check */
420         if (fdt->fd[fd] != NULL) {
421                 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
422                 fdt->fd[fd] = NULL;
423         }
424 #endif
425         error = fd;
426
427 out:
428         spin_unlock(&files->file_lock);
429         return error;
430 }
431
432 /*
433  * copied from fd_install
434  */
435 static void task_fd_install(
436         struct binder_proc *proc, unsigned int fd, struct file *file)
437 {
438         struct files_struct *files = proc->files;
439         struct fdtable *fdt;
440
441         if (files == NULL)
442                 return;
443
444         spin_lock(&files->file_lock);
445         fdt = files_fdtable(files);
446         BUG_ON(fdt->fd[fd] != NULL);
447         rcu_assign_pointer(fdt->fd[fd], file);
448         spin_unlock(&files->file_lock);
449 }
450
451 /*
452  * copied from __put_unused_fd in open.c
453  */
454 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
455 {
456         struct fdtable *fdt = files_fdtable(files);
457         __FD_CLR(fd, fdt->open_fds);
458         if (fd < files->next_fd)
459                 files->next_fd = fd;
460 }
461
462 /*
463  * copied from sys_close
464  */
465 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
466 {
467         struct file *filp;
468         struct files_struct *files = proc->files;
469         struct fdtable *fdt;
470         int retval;
471
472         if (files == NULL)
473                 return -ESRCH;
474
475         spin_lock(&files->file_lock);
476         fdt = files_fdtable(files);
477         if (fd >= fdt->max_fds)
478                 goto out_unlock;
479         filp = fdt->fd[fd];
480         if (!filp)
481                 goto out_unlock;
482         rcu_assign_pointer(fdt->fd[fd], NULL);
483         FD_CLR(fd, fdt->close_on_exec);
484         __put_unused_fd(files, fd);
485         spin_unlock(&files->file_lock);
486         retval = filp_close(filp, files);
487
488         /* can't restart close syscall because file table entry was cleared */
489         if (unlikely(retval == -ERESTARTSYS ||
490                      retval == -ERESTARTNOINTR ||
491                      retval == -ERESTARTNOHAND ||
492                      retval == -ERESTART_RESTARTBLOCK))
493                 retval = -EINTR;
494
495         return retval;
496
497 out_unlock:
498         spin_unlock(&files->file_lock);
499         return -EBADF;
500 }
501
502 static void binder_set_nice(long nice)
503 {
504         long min_nice;
505         if (can_nice(current, nice)) {
506                 set_user_nice(current, nice);
507                 return;
508         }
509         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
510         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
511                      "binder: %d: nice value %ld not allowed use "
512                      "%ld instead\n", current->pid, nice, min_nice);
513         set_user_nice(current, min_nice);
514         if (min_nice < 20)
515                 return;
516         binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
517 }
518
519 static size_t binder_buffer_size(struct binder_proc *proc,
520                                  struct binder_buffer *buffer)
521 {
522         if (list_is_last(&buffer->entry, &proc->buffers))
523                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
524         else
525                 return (size_t)list_entry(buffer->entry.next,
526                         struct binder_buffer, entry) - (size_t)buffer->data;
527 }
528
529 static void binder_insert_free_buffer(struct binder_proc *proc,
530                                       struct binder_buffer *new_buffer)
531 {
532         struct rb_node **p = &proc->free_buffers.rb_node;
533         struct rb_node *parent = NULL;
534         struct binder_buffer *buffer;
535         size_t buffer_size;
536         size_t new_buffer_size;
537
538         BUG_ON(!new_buffer->free);
539
540         new_buffer_size = binder_buffer_size(proc, new_buffer);
541
542         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
543                      "binder: %d: add free buffer, size %zd, "
544                      "at %p\n", proc->pid, new_buffer_size, new_buffer);
545
546         while (*p) {
547                 parent = *p;
548                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
549                 BUG_ON(!buffer->free);
550
551                 buffer_size = binder_buffer_size(proc, buffer);
552
553                 if (new_buffer_size < buffer_size)
554                         p = &parent->rb_left;
555                 else
556                         p = &parent->rb_right;
557         }
558         rb_link_node(&new_buffer->rb_node, parent, p);
559         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
560 }
561
562 static void binder_insert_allocated_buffer(struct binder_proc *proc,
563                                            struct binder_buffer *new_buffer)
564 {
565         struct rb_node **p = &proc->allocated_buffers.rb_node;
566         struct rb_node *parent = NULL;
567         struct binder_buffer *buffer;
568
569         BUG_ON(new_buffer->free);
570
571         while (*p) {
572                 parent = *p;
573                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
574                 BUG_ON(buffer->free);
575
576                 if (new_buffer < buffer)
577                         p = &parent->rb_left;
578                 else if (new_buffer > buffer)
579                         p = &parent->rb_right;
580                 else
581                         BUG();
582         }
583         rb_link_node(&new_buffer->rb_node, parent, p);
584         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
585 }
586
587 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
588                                                   void __user *user_ptr)
589 {
590         struct rb_node *n = proc->allocated_buffers.rb_node;
591         struct binder_buffer *buffer;
592         struct binder_buffer *kern_ptr;
593
594         kern_ptr = user_ptr - proc->user_buffer_offset
595                 - offsetof(struct binder_buffer, data);
596
597         while (n) {
598                 buffer = rb_entry(n, struct binder_buffer, rb_node);
599                 BUG_ON(buffer->free);
600
601                 if (kern_ptr < buffer)
602                         n = n->rb_left;
603                 else if (kern_ptr > buffer)
604                         n = n->rb_right;
605                 else
606                         return buffer;
607         }
608         return NULL;
609 }
610
611 static int binder_update_page_range(struct binder_proc *proc, int allocate,
612                                     void *start, void *end,
613                                     struct vm_area_struct *vma)
614 {
615         void *page_addr;
616         unsigned long user_page_addr;
617         struct vm_struct tmp_area;
618         struct page **page;
619         struct mm_struct *mm;
620
621         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
622                      "binder: %d: %s pages %p-%p\n", proc->pid,
623                      allocate ? "allocate" : "free", start, end);
624
625         if (end <= start)
626                 return 0;
627
628         if (vma)
629                 mm = NULL;
630         else
631                 mm = get_task_mm(proc->tsk);
632
633         if (mm) {
634                 down_write(&mm->mmap_sem);
635                 vma = proc->vma;
636                 if (vma && mm != vma->vm_mm) {
637                         pr_err("binder: %d: vma mm and task mm mismatch\n",
638                                 proc->pid);
639                         vma = NULL;
640                 }
641         }
642
643         if (allocate == 0)
644                 goto free_range;
645
646         if (vma == NULL) {
647                 printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
648                        "map pages in userspace, no vma\n", proc->pid);
649                 goto err_no_vma;
650         }
651
652         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
653                 int ret;
654                 struct page **page_array_ptr;
655                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
656
657                 BUG_ON(*page);
658                 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
659                 if (*page == NULL) {
660                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
661                                "for page at %p\n", proc->pid, page_addr);
662                         goto err_alloc_page_failed;
663                 }
664                 tmp_area.addr = page_addr;
665                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
666                 page_array_ptr = page;
667                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
668                 if (ret) {
669                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
670                                "to map page at %p in kernel\n",
671                                proc->pid, page_addr);
672                         goto err_map_kernel_failed;
673                 }
674                 user_page_addr =
675                         (uintptr_t)page_addr + proc->user_buffer_offset;
676                 ret = vm_insert_page(vma, user_page_addr, page[0]);
677                 if (ret) {
678                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
679                                "to map page at %lx in userspace\n",
680                                proc->pid, user_page_addr);
681                         goto err_vm_insert_page_failed;
682                 }
683                 /* vm_insert_page does not seem to increment the refcount */
684         }
685         if (mm) {
686                 up_write(&mm->mmap_sem);
687                 mmput(mm);
688         }
689         return 0;
690
691 free_range:
692         for (page_addr = end - PAGE_SIZE; page_addr >= start;
693              page_addr -= PAGE_SIZE) {
694                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
695                 if (vma)
696                         zap_page_range(vma, (uintptr_t)page_addr +
697                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
698 err_vm_insert_page_failed:
699                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
700 err_map_kernel_failed:
701                 __free_page(*page);
702                 *page = NULL;
703 err_alloc_page_failed:
704                 ;
705         }
706 err_no_vma:
707         if (mm) {
708                 up_write(&mm->mmap_sem);
709                 mmput(mm);
710         }
711         return -ENOMEM;
712 }
713
714 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
715                                               size_t data_size,
716                                               size_t offsets_size, int is_async)
717 {
718         struct rb_node *n = proc->free_buffers.rb_node;
719         struct binder_buffer *buffer;
720         size_t buffer_size;
721         struct rb_node *best_fit = NULL;
722         void *has_page_addr;
723         void *end_page_addr;
724         size_t size;
725
726         if (proc->vma == NULL) {
727                 printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n",
728                        proc->pid);
729                 return NULL;
730         }
731
732         size = ALIGN(data_size, sizeof(void *)) +
733                 ALIGN(offsets_size, sizeof(void *));
734
735         if (size < data_size || size < offsets_size) {
736                 binder_user_error("binder: %d: got transaction with invalid "
737                         "size %zd-%zd\n", proc->pid, data_size, offsets_size);
738                 return NULL;
739         }
740
741         if (is_async &&
742             proc->free_async_space < size + sizeof(struct binder_buffer)) {
743                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
744                              "binder: %d: binder_alloc_buf size %zd"
745                              "failed, no async space left\n", proc->pid, size);
746                 return NULL;
747         }
748
749         while (n) {
750                 buffer = rb_entry(n, struct binder_buffer, rb_node);
751                 BUG_ON(!buffer->free);
752                 buffer_size = binder_buffer_size(proc, buffer);
753
754                 if (size < buffer_size) {
755                         best_fit = n;
756                         n = n->rb_left;
757                 } else if (size > buffer_size)
758                         n = n->rb_right;
759                 else {
760                         best_fit = n;
761                         break;
762                 }
763         }
764         if (best_fit == NULL) {
765                 printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, "
766                        "no address space\n", proc->pid, size);
767                 return NULL;
768         }
769         if (n == NULL) {
770                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
771                 buffer_size = binder_buffer_size(proc, buffer);
772         }
773
774         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
775                      "binder: %d: binder_alloc_buf size %zd got buff"
776                      "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
777
778         has_page_addr =
779                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
780         if (n == NULL) {
781                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
782                         buffer_size = size; /* no room for other buffers */
783                 else
784                         buffer_size = size + sizeof(struct binder_buffer);
785         }
786         end_page_addr =
787                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
788         if (end_page_addr > has_page_addr)
789                 end_page_addr = has_page_addr;
790         if (binder_update_page_range(proc, 1,
791             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
792                 return NULL;
793
794         rb_erase(best_fit, &proc->free_buffers);
795         buffer->free = 0;
796         binder_insert_allocated_buffer(proc, buffer);
797         if (buffer_size != size) {
798                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
799                 list_add(&new_buffer->entry, &buffer->entry);
800                 new_buffer->free = 1;
801                 binder_insert_free_buffer(proc, new_buffer);
802         }
803         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
804                      "binder: %d: binder_alloc_buf size %zd got "
805                      "%p\n", proc->pid, size, buffer);
806         buffer->data_size = data_size;
807         buffer->offsets_size = offsets_size;
808         buffer->async_transaction = is_async;
809         if (is_async) {
810                 proc->free_async_space -= size + sizeof(struct binder_buffer);
811                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
812                              "binder: %d: binder_alloc_buf size %zd "
813                              "async free %zd\n", proc->pid, size,
814                              proc->free_async_space);
815         }
816
817         return buffer;
818 }
819
820 static void *buffer_start_page(struct binder_buffer *buffer)
821 {
822         return (void *)((uintptr_t)buffer & PAGE_MASK);
823 }
824
825 static void *buffer_end_page(struct binder_buffer *buffer)
826 {
827         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
828 }
829
830 static void binder_delete_free_buffer(struct binder_proc *proc,
831                                       struct binder_buffer *buffer)
832 {
833         struct binder_buffer *prev, *next = NULL;
834         int free_page_end = 1;
835         int free_page_start = 1;
836
837         BUG_ON(proc->buffers.next == &buffer->entry);
838         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
839         BUG_ON(!prev->free);
840         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
841                 free_page_start = 0;
842                 if (buffer_end_page(prev) == buffer_end_page(buffer))
843                         free_page_end = 0;
844                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
845                              "binder: %d: merge free, buffer %p "
846                              "share page with %p\n", proc->pid, buffer, prev);
847         }
848
849         if (!list_is_last(&buffer->entry, &proc->buffers)) {
850                 next = list_entry(buffer->entry.next,
851                                   struct binder_buffer, entry);
852                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
853                         free_page_end = 0;
854                         if (buffer_start_page(next) ==
855                             buffer_start_page(buffer))
856                                 free_page_start = 0;
857                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
858                                      "binder: %d: merge free, buffer"
859                                      " %p share page with %p\n", proc->pid,
860                                      buffer, prev);
861                 }
862         }
863         list_del(&buffer->entry);
864         if (free_page_start || free_page_end) {
865                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
866                              "binder: %d: merge free, buffer %p do "
867                              "not share page%s%s with with %p or %p\n",
868                              proc->pid, buffer, free_page_start ? "" : " end",
869                              free_page_end ? "" : " start", prev, next);
870                 binder_update_page_range(proc, 0, free_page_start ?
871                         buffer_start_page(buffer) : buffer_end_page(buffer),
872                         (free_page_end ? buffer_end_page(buffer) :
873                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
874         }
875 }
876
877 static void binder_free_buf(struct binder_proc *proc,
878                             struct binder_buffer *buffer)
879 {
880         size_t size, buffer_size;
881
882         buffer_size = binder_buffer_size(proc, buffer);
883
884         size = ALIGN(buffer->data_size, sizeof(void *)) +
885                 ALIGN(buffer->offsets_size, sizeof(void *));
886
887         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
888                      "binder: %d: binder_free_buf %p size %zd buffer"
889                      "_size %zd\n", proc->pid, buffer, size, buffer_size);
890
891         BUG_ON(buffer->free);
892         BUG_ON(size > buffer_size);
893         BUG_ON(buffer->transaction != NULL);
894         BUG_ON((void *)buffer < proc->buffer);
895         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
896
897         if (buffer->async_transaction) {
898                 proc->free_async_space += size + sizeof(struct binder_buffer);
899
900                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
901                              "binder: %d: binder_free_buf size %zd "
902                              "async free %zd\n", proc->pid, size,
903                              proc->free_async_space);
904         }
905
906         binder_update_page_range(proc, 0,
907                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
908                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
909                 NULL);
910         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
911         buffer->free = 1;
912         if (!list_is_last(&buffer->entry, &proc->buffers)) {
913                 struct binder_buffer *next = list_entry(buffer->entry.next,
914                                                 struct binder_buffer, entry);
915                 if (next->free) {
916                         rb_erase(&next->rb_node, &proc->free_buffers);
917                         binder_delete_free_buffer(proc, next);
918                 }
919         }
920         if (proc->buffers.next != &buffer->entry) {
921                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
922                                                 struct binder_buffer, entry);
923                 if (prev->free) {
924                         binder_delete_free_buffer(proc, buffer);
925                         rb_erase(&prev->rb_node, &proc->free_buffers);
926                         buffer = prev;
927                 }
928         }
929         binder_insert_free_buffer(proc, buffer);
930 }
931
932 static struct binder_node *binder_get_node(struct binder_proc *proc,
933                                            void __user *ptr)
934 {
935         struct rb_node *n = proc->nodes.rb_node;
936         struct binder_node *node;
937
938         while (n) {
939                 node = rb_entry(n, struct binder_node, rb_node);
940
941                 if (ptr < node->ptr)
942                         n = n->rb_left;
943                 else if (ptr > node->ptr)
944                         n = n->rb_right;
945                 else
946                         return node;
947         }
948         return NULL;
949 }
950
951 static struct binder_node *binder_new_node(struct binder_proc *proc,
952                                            void __user *ptr,
953                                            void __user *cookie)
954 {
955         struct rb_node **p = &proc->nodes.rb_node;
956         struct rb_node *parent = NULL;
957         struct binder_node *node;
958
959         while (*p) {
960                 parent = *p;
961                 node = rb_entry(parent, struct binder_node, rb_node);
962
963                 if (ptr < node->ptr)
964                         p = &(*p)->rb_left;
965                 else if (ptr > node->ptr)
966                         p = &(*p)->rb_right;
967                 else
968                         return NULL;
969         }
970
971         node = kzalloc(sizeof(*node), GFP_KERNEL);
972         if (node == NULL)
973                 return NULL;
974         binder_stats_created(BINDER_STAT_NODE);
975         rb_link_node(&node->rb_node, parent, p);
976         rb_insert_color(&node->rb_node, &proc->nodes);
977         node->debug_id = ++binder_last_id;
978         node->proc = proc;
979         node->ptr = ptr;
980         node->cookie = cookie;
981         node->work.type = BINDER_WORK_NODE;
982         INIT_LIST_HEAD(&node->work.entry);
983         INIT_LIST_HEAD(&node->async_todo);
984         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
985                      "binder: %d:%d node %d u%p c%p created\n",
986                      proc->pid, current->pid, node->debug_id,
987                      node->ptr, node->cookie);
988         return node;
989 }
990
991 static int binder_inc_node(struct binder_node *node, int strong, int internal,
992                            struct list_head *target_list)
993 {
994         if (strong) {
995                 if (internal) {
996                         if (target_list == NULL &&
997                             node->internal_strong_refs == 0 &&
998                             !(node == binder_context_mgr_node &&
999                             node->has_strong_ref)) {
1000                                 printk(KERN_ERR "binder: invalid inc strong "
1001                                         "node for %d\n", node->debug_id);
1002                                 return -EINVAL;
1003                         }
1004                         node->internal_strong_refs++;
1005                 } else
1006                         node->local_strong_refs++;
1007                 if (!node->has_strong_ref && target_list) {
1008                         list_del_init(&node->work.entry);
1009                         list_add_tail(&node->work.entry, target_list);
1010                 }
1011         } else {
1012                 if (!internal)
1013                         node->local_weak_refs++;
1014                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
1015                         if (target_list == NULL) {
1016                                 printk(KERN_ERR "binder: invalid inc weak node "
1017                                         "for %d\n", node->debug_id);
1018                                 return -EINVAL;
1019                         }
1020                         list_add_tail(&node->work.entry, target_list);
1021                 }
1022         }
1023         return 0;
1024 }
1025
1026 static int binder_dec_node(struct binder_node *node, int strong, int internal)
1027 {
1028         if (strong) {
1029                 if (internal)
1030                         node->internal_strong_refs--;
1031                 else
1032                         node->local_strong_refs--;
1033                 if (node->local_strong_refs || node->internal_strong_refs)
1034                         return 0;
1035         } else {
1036                 if (!internal)
1037                         node->local_weak_refs--;
1038                 if (node->local_weak_refs || !hlist_empty(&node->refs))
1039                         return 0;
1040         }
1041         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
1042                 if (list_empty(&node->work.entry)) {
1043                         list_add_tail(&node->work.entry, &node->proc->todo);
1044                         wake_up_interruptible(&node->proc->wait);
1045                 }
1046         } else {
1047                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1048                     !node->local_weak_refs) {
1049                         list_del_init(&node->work.entry);
1050                         if (node->proc) {
1051                                 rb_erase(&node->rb_node, &node->proc->nodes);
1052                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1053                                              "binder: refless node %d deleted\n",
1054                                              node->debug_id);
1055                         } else {
1056                                 hlist_del(&node->dead_node);
1057                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1058                                              "binder: dead node %d deleted\n",
1059                                              node->debug_id);
1060                         }
1061                         kfree(node);
1062                         binder_stats_deleted(BINDER_STAT_NODE);
1063                 }
1064         }
1065
1066         return 0;
1067 }
1068
1069
1070 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1071                                          uint32_t desc)
1072 {
1073         struct rb_node *n = proc->refs_by_desc.rb_node;
1074         struct binder_ref *ref;
1075
1076         while (n) {
1077                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1078
1079                 if (desc < ref->desc)
1080                         n = n->rb_left;
1081                 else if (desc > ref->desc)
1082                         n = n->rb_right;
1083                 else
1084                         return ref;
1085         }
1086         return NULL;
1087 }
1088
1089 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1090                                                   struct binder_node *node)
1091 {
1092         struct rb_node *n;
1093         struct rb_node **p = &proc->refs_by_node.rb_node;
1094         struct rb_node *parent = NULL;
1095         struct binder_ref *ref, *new_ref;
1096
1097         while (*p) {
1098                 parent = *p;
1099                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1100
1101                 if (node < ref->node)
1102                         p = &(*p)->rb_left;
1103                 else if (node > ref->node)
1104                         p = &(*p)->rb_right;
1105                 else
1106                         return ref;
1107         }
1108         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1109         if (new_ref == NULL)
1110                 return NULL;
1111         binder_stats_created(BINDER_STAT_REF);
1112         new_ref->debug_id = ++binder_last_id;
1113         new_ref->proc = proc;
1114         new_ref->node = node;
1115         rb_link_node(&new_ref->rb_node_node, parent, p);
1116         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1117
1118         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1119         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1120                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1121                 if (ref->desc > new_ref->desc)
1122                         break;
1123                 new_ref->desc = ref->desc + 1;
1124         }
1125
1126         p = &proc->refs_by_desc.rb_node;
1127         while (*p) {
1128                 parent = *p;
1129                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1130
1131                 if (new_ref->desc < ref->desc)
1132                         p = &(*p)->rb_left;
1133                 else if (new_ref->desc > ref->desc)
1134                         p = &(*p)->rb_right;
1135                 else
1136                         BUG();
1137         }
1138         rb_link_node(&new_ref->rb_node_desc, parent, p);
1139         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1140         if (node) {
1141                 hlist_add_head(&new_ref->node_entry, &node->refs);
1142
1143                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1144                              "binder: %d new ref %d desc %d for "
1145                              "node %d\n", proc->pid, new_ref->debug_id,
1146                              new_ref->desc, node->debug_id);
1147         } else {
1148                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1149                              "binder: %d new ref %d desc %d for "
1150                              "dead node\n", proc->pid, new_ref->debug_id,
1151                               new_ref->desc);
1152         }
1153         return new_ref;
1154 }
1155
1156 static void binder_delete_ref(struct binder_ref *ref)
1157 {
1158         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1159                      "binder: %d delete ref %d desc %d for "
1160                      "node %d\n", ref->proc->pid, ref->debug_id,
1161                      ref->desc, ref->node->debug_id);
1162
1163         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1164         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1165         if (ref->strong)
1166                 binder_dec_node(ref->node, 1, 1);
1167         hlist_del(&ref->node_entry);
1168         binder_dec_node(ref->node, 0, 1);
1169         if (ref->death) {
1170                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1171                              "binder: %d delete ref %d desc %d "
1172                              "has death notification\n", ref->proc->pid,
1173                              ref->debug_id, ref->desc);
1174                 list_del(&ref->death->work.entry);
1175                 kfree(ref->death);
1176                 binder_stats_deleted(BINDER_STAT_DEATH);
1177         }
1178         kfree(ref);
1179         binder_stats_deleted(BINDER_STAT_REF);
1180 }
1181
1182 static int binder_inc_ref(struct binder_ref *ref, int strong,
1183                           struct list_head *target_list)
1184 {
1185         int ret;
1186         if (strong) {
1187                 if (ref->strong == 0) {
1188                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1189                         if (ret)
1190                                 return ret;
1191                 }
1192                 ref->strong++;
1193         } else {
1194                 if (ref->weak == 0) {
1195                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1196                         if (ret)
1197                                 return ret;
1198                 }
1199                 ref->weak++;
1200         }
1201         return 0;
1202 }
1203
1204
1205 static int binder_dec_ref(struct binder_ref *ref, int strong)
1206 {
1207         if (strong) {
1208                 if (ref->strong == 0) {
1209                         binder_user_error("binder: %d invalid dec strong, "
1210                                           "ref %d desc %d s %d w %d\n",
1211                                           ref->proc->pid, ref->debug_id,
1212                                           ref->desc, ref->strong, ref->weak);
1213                         return -EINVAL;
1214                 }
1215                 ref->strong--;
1216                 if (ref->strong == 0) {
1217                         int ret;
1218                         ret = binder_dec_node(ref->node, strong, 1);
1219                         if (ret)
1220                                 return ret;
1221                 }
1222         } else {
1223                 if (ref->weak == 0) {
1224                         binder_user_error("binder: %d invalid dec weak, "
1225                                           "ref %d desc %d s %d w %d\n",
1226                                           ref->proc->pid, ref->debug_id,
1227                                           ref->desc, ref->strong, ref->weak);
1228                         return -EINVAL;
1229                 }
1230                 ref->weak--;
1231         }
1232         if (ref->strong == 0 && ref->weak == 0)
1233                 binder_delete_ref(ref);
1234         return 0;
1235 }
1236
1237 static void binder_pop_transaction(struct binder_thread *target_thread,
1238                                    struct binder_transaction *t)
1239 {
1240         if (target_thread) {
1241                 BUG_ON(target_thread->transaction_stack != t);
1242                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1243                 target_thread->transaction_stack =
1244                         target_thread->transaction_stack->from_parent;
1245                 t->from = NULL;
1246         }
1247         t->need_reply = 0;
1248         if (t->buffer)
1249                 t->buffer->transaction = NULL;
1250         kfree(t);
1251         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1252 }
1253
1254 static void binder_send_failed_reply(struct binder_transaction *t,
1255                                      uint32_t error_code)
1256 {
1257         struct binder_thread *target_thread;
1258         BUG_ON(t->flags & TF_ONE_WAY);
1259         while (1) {
1260                 target_thread = t->from;
1261                 if (target_thread) {
1262                         if (target_thread->return_error != BR_OK &&
1263                            target_thread->return_error2 == BR_OK) {
1264                                 target_thread->return_error2 =
1265                                         target_thread->return_error;
1266                                 target_thread->return_error = BR_OK;
1267                         }
1268                         if (target_thread->return_error == BR_OK) {
1269                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1270                                              "binder: send failed reply for "
1271                                              "transaction %d to %d:%d\n",
1272                                               t->debug_id, target_thread->proc->pid,
1273                                               target_thread->pid);
1274
1275                                 binder_pop_transaction(target_thread, t);
1276                                 target_thread->return_error = error_code;
1277                                 wake_up_interruptible(&target_thread->wait);
1278                         } else {
1279                                 printk(KERN_ERR "binder: reply failed, target "
1280                                         "thread, %d:%d, has error code %d "
1281                                         "already\n", target_thread->proc->pid,
1282                                         target_thread->pid,
1283                                         target_thread->return_error);
1284                         }
1285                         return;
1286                 } else {
1287                         struct binder_transaction *next = t->from_parent;
1288
1289                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1290                                      "binder: send failed reply "
1291                                      "for transaction %d, target dead\n",
1292                                      t->debug_id);
1293
1294                         binder_pop_transaction(target_thread, t);
1295                         if (next == NULL) {
1296                                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1297                                              "binder: reply failed,"
1298                                              " no target thread at root\n");
1299                                 return;
1300                         }
1301                         t = next;
1302                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1303                                      "binder: reply failed, no target "
1304                                      "thread -- retry %d\n", t->debug_id);
1305                 }
1306         }
1307 }
1308
1309 static void binder_transaction_buffer_release(struct binder_proc *proc,
1310                                               struct binder_buffer *buffer,
1311                                               size_t *failed_at)
1312 {
1313         size_t *offp, *off_end;
1314         int debug_id = buffer->debug_id;
1315
1316         binder_debug(BINDER_DEBUG_TRANSACTION,
1317                      "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1318                      proc->pid, buffer->debug_id,
1319                      buffer->data_size, buffer->offsets_size, failed_at);
1320
1321         if (buffer->target_node)
1322                 binder_dec_node(buffer->target_node, 1, 0);
1323
1324         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1325         if (failed_at)
1326                 off_end = failed_at;
1327         else
1328                 off_end = (void *)offp + buffer->offsets_size;
1329         for (; offp < off_end; offp++) {
1330                 struct flat_binder_object *fp;
1331                 if (*offp > buffer->data_size - sizeof(*fp) ||
1332                     buffer->data_size < sizeof(*fp) ||
1333                     !IS_ALIGNED(*offp, sizeof(void *))) {
1334                         printk(KERN_ERR "binder: transaction release %d bad"
1335                                         "offset %zd, size %zd\n", debug_id,
1336                                         *offp, buffer->data_size);
1337                         continue;
1338                 }
1339                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1340                 switch (fp->type) {
1341                 case BINDER_TYPE_BINDER:
1342                 case BINDER_TYPE_WEAK_BINDER: {
1343                         struct binder_node *node = binder_get_node(proc, fp->binder);
1344                         if (node == NULL) {
1345                                 printk(KERN_ERR "binder: transaction release %d"
1346                                        " bad node %p\n", debug_id, fp->binder);
1347                                 break;
1348                         }
1349                         binder_debug(BINDER_DEBUG_TRANSACTION,
1350                                      "        node %d u%p\n",
1351                                      node->debug_id, node->ptr);
1352                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1353                 } break;
1354                 case BINDER_TYPE_HANDLE:
1355                 case BINDER_TYPE_WEAK_HANDLE: {
1356                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1357                         if (ref == NULL) {
1358                                 printk(KERN_ERR "binder: transaction release %d"
1359                                        " bad handle %ld\n", debug_id,
1360                                        fp->handle);
1361                                 break;
1362                         }
1363                         binder_debug(BINDER_DEBUG_TRANSACTION,
1364                                      "        ref %d desc %d (node %d)\n",
1365                                      ref->debug_id, ref->desc, ref->node->debug_id);
1366                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1367                 } break;
1368
1369                 case BINDER_TYPE_FD:
1370                         binder_debug(BINDER_DEBUG_TRANSACTION,
1371                                      "        fd %ld\n", fp->handle);
1372                         if (failed_at)
1373                                 task_close_fd(proc, fp->handle);
1374                         break;
1375
1376                 default:
1377                         printk(KERN_ERR "binder: transaction release %d bad "
1378                                "object type %lx\n", debug_id, fp->type);
1379                         break;
1380                 }
1381         }
1382 }
1383
1384 static void binder_transaction(struct binder_proc *proc,
1385                                struct binder_thread *thread,
1386                                struct binder_transaction_data *tr, int reply)
1387 {
1388         struct binder_transaction *t;
1389         struct binder_work *tcomplete;
1390         size_t *offp, *off_end;
1391         struct binder_proc *target_proc;
1392         struct binder_thread *target_thread = NULL;
1393         struct binder_node *target_node = NULL;
1394         struct list_head *target_list;
1395         wait_queue_head_t *target_wait;
1396         struct binder_transaction *in_reply_to = NULL;
1397         struct binder_transaction_log_entry *e;
1398         uint32_t return_error;
1399
1400         e = binder_transaction_log_add(&binder_transaction_log);
1401         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1402         e->from_proc = proc->pid;
1403         e->from_thread = thread->pid;
1404         e->target_handle = tr->target.handle;
1405         e->data_size = tr->data_size;
1406         e->offsets_size = tr->offsets_size;
1407
1408         if (reply) {
1409                 in_reply_to = thread->transaction_stack;
1410                 if (in_reply_to == NULL) {
1411                         binder_user_error("binder: %d:%d got reply transaction "
1412                                           "with no transaction stack\n",
1413                                           proc->pid, thread->pid);
1414                         return_error = BR_FAILED_REPLY;
1415                         goto err_empty_call_stack;
1416                 }
1417                 binder_set_nice(in_reply_to->saved_priority);
1418                 if (in_reply_to->to_thread != thread) {
1419                         binder_user_error("binder: %d:%d got reply transaction "
1420                                 "with bad transaction stack,"
1421                                 " transaction %d has target %d:%d\n",
1422                                 proc->pid, thread->pid, in_reply_to->debug_id,
1423                                 in_reply_to->to_proc ?
1424                                 in_reply_to->to_proc->pid : 0,
1425                                 in_reply_to->to_thread ?
1426                                 in_reply_to->to_thread->pid : 0);
1427                         return_error = BR_FAILED_REPLY;
1428                         in_reply_to = NULL;
1429                         goto err_bad_call_stack;
1430                 }
1431                 thread->transaction_stack = in_reply_to->to_parent;
1432                 target_thread = in_reply_to->from;
1433                 if (target_thread == NULL) {
1434                         return_error = BR_DEAD_REPLY;
1435                         goto err_dead_binder;
1436                 }
1437                 if (target_thread->transaction_stack != in_reply_to) {
1438                         binder_user_error("binder: %d:%d got reply transaction "
1439                                 "with bad target transaction stack %d, "
1440                                 "expected %d\n",
1441                                 proc->pid, thread->pid,
1442                                 target_thread->transaction_stack ?
1443                                 target_thread->transaction_stack->debug_id : 0,
1444                                 in_reply_to->debug_id);
1445                         return_error = BR_FAILED_REPLY;
1446                         in_reply_to = NULL;
1447                         target_thread = NULL;
1448                         goto err_dead_binder;
1449                 }
1450                 target_proc = target_thread->proc;
1451         } else {
1452                 if (tr->target.handle) {
1453                         struct binder_ref *ref;
1454                         ref = binder_get_ref(proc, tr->target.handle);
1455                         if (ref == NULL) {
1456                                 binder_user_error("binder: %d:%d got "
1457                                         "transaction to invalid handle\n",
1458                                         proc->pid, thread->pid);
1459                                 return_error = BR_FAILED_REPLY;
1460                                 goto err_invalid_target_handle;
1461                         }
1462                         target_node = ref->node;
1463                 } else {
1464                         target_node = binder_context_mgr_node;
1465                         if (target_node == NULL) {
1466                                 return_error = BR_DEAD_REPLY;
1467                                 goto err_no_context_mgr_node;
1468                         }
1469                 }
1470                 e->to_node = target_node->debug_id;
1471                 target_proc = target_node->proc;
1472                 if (target_proc == NULL) {
1473                         return_error = BR_DEAD_REPLY;
1474                         goto err_dead_binder;
1475                 }
1476                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1477                         struct binder_transaction *tmp;
1478                         tmp = thread->transaction_stack;
1479                         if (tmp->to_thread != thread) {
1480                                 binder_user_error("binder: %d:%d got new "
1481                                         "transaction with bad transaction stack"
1482                                         ", transaction %d has target %d:%d\n",
1483                                         proc->pid, thread->pid, tmp->debug_id,
1484                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1485                                         tmp->to_thread ?
1486                                         tmp->to_thread->pid : 0);
1487                                 return_error = BR_FAILED_REPLY;
1488                                 goto err_bad_call_stack;
1489                         }
1490                         while (tmp) {
1491                                 if (tmp->from && tmp->from->proc == target_proc)
1492                                         target_thread = tmp->from;
1493                                 tmp = tmp->from_parent;
1494                         }
1495                 }
1496         }
1497         if (target_thread) {
1498                 e->to_thread = target_thread->pid;
1499                 target_list = &target_thread->todo;
1500                 target_wait = &target_thread->wait;
1501         } else {
1502                 target_list = &target_proc->todo;
1503                 target_wait = &target_proc->wait;
1504         }
1505         e->to_proc = target_proc->pid;
1506
1507         /* TODO: reuse incoming transaction for reply */
1508         t = kzalloc(sizeof(*t), GFP_KERNEL);
1509         if (t == NULL) {
1510                 return_error = BR_FAILED_REPLY;
1511                 goto err_alloc_t_failed;
1512         }
1513         binder_stats_created(BINDER_STAT_TRANSACTION);
1514
1515         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1516         if (tcomplete == NULL) {
1517                 return_error = BR_FAILED_REPLY;
1518                 goto err_alloc_tcomplete_failed;
1519         }
1520         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1521
1522         t->debug_id = ++binder_last_id;
1523         e->debug_id = t->debug_id;
1524
1525         if (reply)
1526                 binder_debug(BINDER_DEBUG_TRANSACTION,
1527                              "binder: %d:%d BC_REPLY %d -> %d:%d, "
1528                              "data %p-%p size %zd-%zd\n",
1529                              proc->pid, thread->pid, t->debug_id,
1530                              target_proc->pid, target_thread->pid,
1531                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1532                              tr->data_size, tr->offsets_size);
1533         else
1534                 binder_debug(BINDER_DEBUG_TRANSACTION,
1535                              "binder: %d:%d BC_TRANSACTION %d -> "
1536                              "%d - node %d, data %p-%p size %zd-%zd\n",
1537                              proc->pid, thread->pid, t->debug_id,
1538                              target_proc->pid, target_node->debug_id,
1539                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1540                              tr->data_size, tr->offsets_size);
1541
1542         if (!reply && !(tr->flags & TF_ONE_WAY))
1543                 t->from = thread;
1544         else
1545                 t->from = NULL;
1546         t->sender_euid = proc->tsk->cred->euid;
1547         t->to_proc = target_proc;
1548         t->to_thread = target_thread;
1549         t->code = tr->code;
1550         t->flags = tr->flags;
1551         t->priority = task_nice(current);
1552         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1553                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1554         if (t->buffer == NULL) {
1555                 return_error = BR_FAILED_REPLY;
1556                 goto err_binder_alloc_buf_failed;
1557         }
1558         t->buffer->allow_user_free = 0;
1559         t->buffer->debug_id = t->debug_id;
1560         t->buffer->transaction = t;
1561         t->buffer->target_node = target_node;
1562         if (target_node)
1563                 binder_inc_node(target_node, 1, 0, NULL);
1564
1565         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1566
1567         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1568                 binder_user_error("binder: %d:%d got transaction with invalid "
1569                         "data ptr\n", proc->pid, thread->pid);
1570                 return_error = BR_FAILED_REPLY;
1571                 goto err_copy_data_failed;
1572         }
1573         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1574                 binder_user_error("binder: %d:%d got transaction with invalid "
1575                         "offsets ptr\n", proc->pid, thread->pid);
1576                 return_error = BR_FAILED_REPLY;
1577                 goto err_copy_data_failed;
1578         }
1579         if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1580                 binder_user_error("binder: %d:%d got transaction with "
1581                         "invalid offsets size, %zd\n",
1582                         proc->pid, thread->pid, tr->offsets_size);
1583                 return_error = BR_FAILED_REPLY;
1584                 goto err_bad_offset;
1585         }
1586         off_end = (void *)offp + tr->offsets_size;
1587         for (; offp < off_end; offp++) {
1588                 struct flat_binder_object *fp;
1589                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1590                     t->buffer->data_size < sizeof(*fp) ||
1591                     !IS_ALIGNED(*offp, sizeof(void *))) {
1592                         binder_user_error("binder: %d:%d got transaction with "
1593                                 "invalid offset, %zd\n",
1594                                 proc->pid, thread->pid, *offp);
1595                         return_error = BR_FAILED_REPLY;
1596                         goto err_bad_offset;
1597                 }
1598                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1599                 switch (fp->type) {
1600                 case BINDER_TYPE_BINDER:
1601                 case BINDER_TYPE_WEAK_BINDER: {
1602                         struct binder_ref *ref;
1603                         struct binder_node *node = binder_get_node(proc, fp->binder);
1604                         if (node == NULL) {
1605                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1606                                 if (node == NULL) {
1607                                         return_error = BR_FAILED_REPLY;
1608                                         goto err_binder_new_node_failed;
1609                                 }
1610                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1611                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1612                         }
1613                         if (fp->cookie != node->cookie) {
1614                                 binder_user_error("binder: %d:%d sending u%p "
1615                                         "node %d, cookie mismatch %p != %p\n",
1616                                         proc->pid, thread->pid,
1617                                         fp->binder, node->debug_id,
1618                                         fp->cookie, node->cookie);
1619                                 goto err_binder_get_ref_for_node_failed;
1620                         }
1621                         ref = binder_get_ref_for_node(target_proc, node);
1622                         if (ref == NULL) {
1623                                 return_error = BR_FAILED_REPLY;
1624                                 goto err_binder_get_ref_for_node_failed;
1625                         }
1626                         if (fp->type == BINDER_TYPE_BINDER)
1627                                 fp->type = BINDER_TYPE_HANDLE;
1628                         else
1629                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1630                         fp->handle = ref->desc;
1631                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1632                                        &thread->todo);
1633
1634                         binder_debug(BINDER_DEBUG_TRANSACTION,
1635                                      "        node %d u%p -> ref %d desc %d\n",
1636                                      node->debug_id, node->ptr, ref->debug_id,
1637                                      ref->desc);
1638                 } break;
1639                 case BINDER_TYPE_HANDLE:
1640                 case BINDER_TYPE_WEAK_HANDLE: {
1641                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1642                         if (ref == NULL) {
1643                                 binder_user_error("binder: %d:%d got "
1644                                         "transaction with invalid "
1645                                         "handle, %ld\n", proc->pid,
1646                                         thread->pid, fp->handle);
1647                                 return_error = BR_FAILED_REPLY;
1648                                 goto err_binder_get_ref_failed;
1649                         }
1650                         if (ref->node->proc == target_proc) {
1651                                 if (fp->type == BINDER_TYPE_HANDLE)
1652                                         fp->type = BINDER_TYPE_BINDER;
1653                                 else
1654                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1655                                 fp->binder = ref->node->ptr;
1656                                 fp->cookie = ref->node->cookie;
1657                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1658                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1659                                              "        ref %d desc %d -> node %d u%p\n",
1660                                              ref->debug_id, ref->desc, ref->node->debug_id,
1661                                              ref->node->ptr);
1662                         } else {
1663                                 struct binder_ref *new_ref;
1664                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1665                                 if (new_ref == NULL) {
1666                                         return_error = BR_FAILED_REPLY;
1667                                         goto err_binder_get_ref_for_node_failed;
1668                                 }
1669                                 fp->handle = new_ref->desc;
1670                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1671                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1672                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1673                                              ref->debug_id, ref->desc, new_ref->debug_id,
1674                                              new_ref->desc, ref->node->debug_id);
1675                         }
1676                 } break;
1677
1678                 case BINDER_TYPE_FD: {
1679                         int target_fd;
1680                         struct file *file;
1681
1682                         if (reply) {
1683                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1684                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1685                                                 proc->pid, thread->pid, fp->handle);
1686                                         return_error = BR_FAILED_REPLY;
1687                                         goto err_fd_not_allowed;
1688                                 }
1689                         } else if (!target_node->accept_fds) {
1690                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1691                                         proc->pid, thread->pid, fp->handle);
1692                                 return_error = BR_FAILED_REPLY;
1693                                 goto err_fd_not_allowed;
1694                         }
1695
1696                         file = fget(fp->handle);
1697                         if (file == NULL) {
1698                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1699                                         proc->pid, thread->pid, fp->handle);
1700                                 return_error = BR_FAILED_REPLY;
1701                                 goto err_fget_failed;
1702                         }
1703                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1704                         if (target_fd < 0) {
1705                                 fput(file);
1706                                 return_error = BR_FAILED_REPLY;
1707                                 goto err_get_unused_fd_failed;
1708                         }
1709                         task_fd_install(target_proc, target_fd, file);
1710                         binder_debug(BINDER_DEBUG_TRANSACTION,
1711                                      "        fd %ld -> %d\n", fp->handle, target_fd);
1712                         /* TODO: fput? */
1713                         fp->handle = target_fd;
1714                 } break;
1715
1716                 default:
1717                         binder_user_error("binder: %d:%d got transactio"
1718                                 "n with invalid object type, %lx\n",
1719                                 proc->pid, thread->pid, fp->type);
1720                         return_error = BR_FAILED_REPLY;
1721                         goto err_bad_object_type;
1722                 }
1723         }
1724         if (reply) {
1725                 BUG_ON(t->buffer->async_transaction != 0);
1726                 binder_pop_transaction(target_thread, in_reply_to);
1727         } else if (!(t->flags & TF_ONE_WAY)) {
1728                 BUG_ON(t->buffer->async_transaction != 0);
1729                 t->need_reply = 1;
1730                 t->from_parent = thread->transaction_stack;
1731                 thread->transaction_stack = t;
1732         } else {
1733                 BUG_ON(target_node == NULL);
1734                 BUG_ON(t->buffer->async_transaction != 1);
1735                 if (target_node->has_async_transaction) {
1736                         target_list = &target_node->async_todo;
1737                         target_wait = NULL;
1738                 } else
1739                         target_node->has_async_transaction = 1;
1740         }
1741         t->work.type = BINDER_WORK_TRANSACTION;
1742         list_add_tail(&t->work.entry, target_list);
1743         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1744         list_add_tail(&tcomplete->entry, &thread->todo);
1745         if (target_wait)
1746                 wake_up_interruptible(target_wait);
1747         return;
1748
1749 err_get_unused_fd_failed:
1750 err_fget_failed:
1751 err_fd_not_allowed:
1752 err_binder_get_ref_for_node_failed:
1753 err_binder_get_ref_failed:
1754 err_binder_new_node_failed:
1755 err_bad_object_type:
1756 err_bad_offset:
1757 err_copy_data_failed:
1758         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1759         t->buffer->transaction = NULL;
1760         binder_free_buf(target_proc, t->buffer);
1761 err_binder_alloc_buf_failed:
1762         kfree(tcomplete);
1763         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1764 err_alloc_tcomplete_failed:
1765         kfree(t);
1766         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1767 err_alloc_t_failed:
1768 err_bad_call_stack:
1769 err_empty_call_stack:
1770 err_dead_binder:
1771 err_invalid_target_handle:
1772 err_no_context_mgr_node:
1773         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1774                      "binder: %d:%d transaction failed %d, size %zd-%zd\n",
1775                      proc->pid, thread->pid, return_error,
1776                      tr->data_size, tr->offsets_size);
1777
1778         {
1779                 struct binder_transaction_log_entry *fe;
1780                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1781                 *fe = *e;
1782         }
1783
1784         BUG_ON(thread->return_error != BR_OK);
1785         if (in_reply_to) {
1786                 thread->return_error = BR_TRANSACTION_COMPLETE;
1787                 binder_send_failed_reply(in_reply_to, return_error);
1788         } else
1789                 thread->return_error = return_error;
1790 }
1791
1792 int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1793                         void __user *buffer, int size, signed long *consumed)
1794 {
1795         uint32_t cmd;
1796         void __user *ptr = buffer + *consumed;
1797         void __user *end = buffer + size;
1798
1799         while (ptr < end && thread->return_error == BR_OK) {
1800                 if (get_user(cmd, (uint32_t __user *)ptr))
1801                         return -EFAULT;
1802                 ptr += sizeof(uint32_t);
1803                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1804                         binder_stats.bc[_IOC_NR(cmd)]++;
1805                         proc->stats.bc[_IOC_NR(cmd)]++;
1806                         thread->stats.bc[_IOC_NR(cmd)]++;
1807                 }
1808                 switch (cmd) {
1809                 case BC_INCREFS:
1810                 case BC_ACQUIRE:
1811                 case BC_RELEASE:
1812                 case BC_DECREFS: {
1813                         uint32_t target;
1814                         struct binder_ref *ref;
1815                         const char *debug_string;
1816
1817                         if (get_user(target, (uint32_t __user *)ptr))
1818                                 return -EFAULT;
1819                         ptr += sizeof(uint32_t);
1820                         if (target == 0 && binder_context_mgr_node &&
1821                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1822                                 ref = binder_get_ref_for_node(proc,
1823                                                binder_context_mgr_node);
1824                                 if (ref->desc != target) {
1825                                         binder_user_error("binder: %d:"
1826                                                 "%d tried to acquire "
1827                                                 "reference to desc 0, "
1828                                                 "got %d instead\n",
1829                                                 proc->pid, thread->pid,
1830                                                 ref->desc);
1831                                 }
1832                         } else
1833                                 ref = binder_get_ref(proc, target);
1834                         if (ref == NULL) {
1835                                 binder_user_error("binder: %d:%d refcou"
1836                                         "nt change on invalid ref %d\n",
1837                                         proc->pid, thread->pid, target);
1838                                 break;
1839                         }
1840                         switch (cmd) {
1841                         case BC_INCREFS:
1842                                 debug_string = "IncRefs";
1843                                 binder_inc_ref(ref, 0, NULL);
1844                                 break;
1845                         case BC_ACQUIRE:
1846                                 debug_string = "Acquire";
1847                                 binder_inc_ref(ref, 1, NULL);
1848                                 break;
1849                         case BC_RELEASE:
1850                                 debug_string = "Release";
1851                                 binder_dec_ref(ref, 1);
1852                                 break;
1853                         case BC_DECREFS:
1854                         default:
1855                                 debug_string = "DecRefs";
1856                                 binder_dec_ref(ref, 0);
1857                                 break;
1858                         }
1859                         binder_debug(BINDER_DEBUG_USER_REFS,
1860                                      "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1861                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1862                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1863                         break;
1864                 }
1865                 case BC_INCREFS_DONE:
1866                 case BC_ACQUIRE_DONE: {
1867                         void __user *node_ptr;
1868                         void *cookie;
1869                         struct binder_node *node;
1870
1871                         if (get_user(node_ptr, (void * __user *)ptr))
1872                                 return -EFAULT;
1873                         ptr += sizeof(void *);
1874                         if (get_user(cookie, (void * __user *)ptr))
1875                                 return -EFAULT;
1876                         ptr += sizeof(void *);
1877                         node = binder_get_node(proc, node_ptr);
1878                         if (node == NULL) {
1879                                 binder_user_error("binder: %d:%d "
1880                                         "%s u%p no match\n",
1881                                         proc->pid, thread->pid,
1882                                         cmd == BC_INCREFS_DONE ?
1883                                         "BC_INCREFS_DONE" :
1884                                         "BC_ACQUIRE_DONE",
1885                                         node_ptr);
1886                                 break;
1887                         }
1888                         if (cookie != node->cookie) {
1889                                 binder_user_error("binder: %d:%d %s u%p node %d"
1890                                         " cookie mismatch %p != %p\n",
1891                                         proc->pid, thread->pid,
1892                                         cmd == BC_INCREFS_DONE ?
1893                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1894                                         node_ptr, node->debug_id,
1895                                         cookie, node->cookie);
1896                                 break;
1897                         }
1898                         if (cmd == BC_ACQUIRE_DONE) {
1899                                 if (node->pending_strong_ref == 0) {
1900                                         binder_user_error("binder: %d:%d "
1901                                                 "BC_ACQUIRE_DONE node %d has "
1902                                                 "no pending acquire request\n",
1903                                                 proc->pid, thread->pid,
1904                                                 node->debug_id);
1905                                         break;
1906                                 }
1907                                 node->pending_strong_ref = 0;
1908                         } else {
1909                                 if (node->pending_weak_ref == 0) {
1910                                         binder_user_error("binder: %d:%d "
1911                                                 "BC_INCREFS_DONE node %d has "
1912                                                 "no pending increfs request\n",
1913                                                 proc->pid, thread->pid,
1914                                                 node->debug_id);
1915                                         break;
1916                                 }
1917                                 node->pending_weak_ref = 0;
1918                         }
1919                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1920                         binder_debug(BINDER_DEBUG_USER_REFS,
1921                                      "binder: %d:%d %s node %d ls %d lw %d\n",
1922                                      proc->pid, thread->pid,
1923                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1924                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1925                         break;
1926                 }
1927                 case BC_ATTEMPT_ACQUIRE:
1928                         printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported\n");
1929                         return -EINVAL;
1930                 case BC_ACQUIRE_RESULT:
1931                         printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported\n");
1932                         return -EINVAL;
1933
1934                 case BC_FREE_BUFFER: {
1935                         void __user *data_ptr;
1936                         struct binder_buffer *buffer;
1937
1938                         if (get_user(data_ptr, (void * __user *)ptr))
1939                                 return -EFAULT;
1940                         ptr += sizeof(void *);
1941
1942                         buffer = binder_buffer_lookup(proc, data_ptr);
1943                         if (buffer == NULL) {
1944                                 binder_user_error("binder: %d:%d "
1945                                         "BC_FREE_BUFFER u%p no match\n",
1946                                         proc->pid, thread->pid, data_ptr);
1947                                 break;
1948                         }
1949                         if (!buffer->allow_user_free) {
1950                                 binder_user_error("binder: %d:%d "
1951                                         "BC_FREE_BUFFER u%p matched "
1952                                         "unreturned buffer\n",
1953                                         proc->pid, thread->pid, data_ptr);
1954                                 break;
1955                         }
1956                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1957                                      "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1958                                      proc->pid, thread->pid, data_ptr, buffer->debug_id,
1959                                      buffer->transaction ? "active" : "finished");
1960
1961                         if (buffer->transaction) {
1962                                 buffer->transaction->buffer = NULL;
1963                                 buffer->transaction = NULL;
1964                         }
1965                         if (buffer->async_transaction && buffer->target_node) {
1966                                 BUG_ON(!buffer->target_node->has_async_transaction);
1967                                 if (list_empty(&buffer->target_node->async_todo))
1968                                         buffer->target_node->has_async_transaction = 0;
1969                                 else
1970                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1971                         }
1972                         binder_transaction_buffer_release(proc, buffer, NULL);
1973                         binder_free_buf(proc, buffer);
1974                         break;
1975                 }
1976
1977                 case BC_TRANSACTION:
1978                 case BC_REPLY: {
1979                         struct binder_transaction_data tr;
1980
1981                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1982                                 return -EFAULT;
1983                         ptr += sizeof(tr);
1984                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1985                         break;
1986                 }
1987
1988                 case BC_REGISTER_LOOPER:
1989                         binder_debug(BINDER_DEBUG_THREADS,
1990                                      "binder: %d:%d BC_REGISTER_LOOPER\n",
1991                                      proc->pid, thread->pid);
1992                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1993                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1994                                 binder_user_error("binder: %d:%d ERROR:"
1995                                         " BC_REGISTER_LOOPER called "
1996                                         "after BC_ENTER_LOOPER\n",
1997                                         proc->pid, thread->pid);
1998                         } else if (proc->requested_threads == 0) {
1999                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2000                                 binder_user_error("binder: %d:%d ERROR:"
2001                                         " BC_REGISTER_LOOPER called "
2002                                         "without request\n",
2003                                         proc->pid, thread->pid);
2004                         } else {
2005                                 proc->requested_threads--;
2006                                 proc->requested_threads_started++;
2007                         }
2008                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
2009                         break;
2010                 case BC_ENTER_LOOPER:
2011                         binder_debug(BINDER_DEBUG_THREADS,
2012                                      "binder: %d:%d BC_ENTER_LOOPER\n",
2013                                      proc->pid, thread->pid);
2014                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
2015                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2016                                 binder_user_error("binder: %d:%d ERROR:"
2017                                         " BC_ENTER_LOOPER called after "
2018                                         "BC_REGISTER_LOOPER\n",
2019                                         proc->pid, thread->pid);
2020                         }
2021                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
2022                         break;
2023                 case BC_EXIT_LOOPER:
2024                         binder_debug(BINDER_DEBUG_THREADS,
2025                                      "binder: %d:%d BC_EXIT_LOOPER\n",
2026                                      proc->pid, thread->pid);
2027                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
2028                         break;
2029
2030                 case BC_REQUEST_DEATH_NOTIFICATION:
2031                 case BC_CLEAR_DEATH_NOTIFICATION: {
2032                         uint32_t target;
2033                         void __user *cookie;
2034                         struct binder_ref *ref;
2035                         struct binder_ref_death *death;
2036
2037                         if (get_user(target, (uint32_t __user *)ptr))
2038                                 return -EFAULT;
2039                         ptr += sizeof(uint32_t);
2040                         if (get_user(cookie, (void __user * __user *)ptr))
2041                                 return -EFAULT;
2042                         ptr += sizeof(void *);
2043                         ref = binder_get_ref(proc, target);
2044                         if (ref == NULL) {
2045                                 binder_user_error("binder: %d:%d %s "
2046                                         "invalid ref %d\n",
2047                                         proc->pid, thread->pid,
2048                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2049                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2050                                         "BC_CLEAR_DEATH_NOTIFICATION",
2051                                         target);
2052                                 break;
2053                         }
2054
2055                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2056                                      "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
2057                                      proc->pid, thread->pid,
2058                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2059                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2060                                      "BC_CLEAR_DEATH_NOTIFICATION",
2061                                      cookie, ref->debug_id, ref->desc,
2062                                      ref->strong, ref->weak, ref->node->debug_id);
2063
2064                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2065                                 if (ref->death) {
2066                                         binder_user_error("binder: %d:%"
2067                                                 "d BC_REQUEST_DEATH_NOTI"
2068                                                 "FICATION death notific"
2069                                                 "ation already set\n",
2070                                                 proc->pid, thread->pid);
2071                                         break;
2072                                 }
2073                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2074                                 if (death == NULL) {
2075                                         thread->return_error = BR_ERROR;
2076                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2077                                                      "binder: %d:%d "
2078                                                      "BC_REQUEST_DEATH_NOTIFICATION failed\n",
2079                                                      proc->pid, thread->pid);
2080                                         break;
2081                                 }
2082                                 binder_stats_created(BINDER_STAT_DEATH);
2083                                 INIT_LIST_HEAD(&death->work.entry);
2084                                 death->cookie = cookie;
2085                                 ref->death = death;
2086                                 if (ref->node->proc == NULL) {
2087                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2088                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2089                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2090                                         } else {
2091                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2092                                                 wake_up_interruptible(&proc->wait);
2093                                         }
2094                                 }
2095                         } else {
2096                                 if (ref->death == NULL) {
2097                                         binder_user_error("binder: %d:%"
2098                                                 "d BC_CLEAR_DEATH_NOTIFI"
2099                                                 "CATION death notificat"
2100                                                 "ion not active\n",
2101                                                 proc->pid, thread->pid);
2102                                         break;
2103                                 }
2104                                 death = ref->death;
2105                                 if (death->cookie != cookie) {
2106                                         binder_user_error("binder: %d:%"
2107                                                 "d BC_CLEAR_DEATH_NOTIFI"
2108                                                 "CATION death notificat"
2109                                                 "ion cookie mismatch "
2110                                                 "%p != %p\n",
2111                                                 proc->pid, thread->pid,
2112                                                 death->cookie, cookie);
2113                                         break;
2114                                 }
2115                                 ref->death = NULL;
2116                                 if (list_empty(&death->work.entry)) {
2117                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2118                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2119                                                 list_add_tail(&death->work.entry, &thread->todo);
2120                                         } else {
2121                                                 list_add_tail(&death->work.entry, &proc->todo);
2122                                                 wake_up_interruptible(&proc->wait);
2123                                         }
2124                                 } else {
2125                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2126                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2127                                 }
2128                         }
2129                 } break;
2130                 case BC_DEAD_BINDER_DONE: {
2131                         struct binder_work *w;
2132                         void __user *cookie;
2133                         struct binder_ref_death *death = NULL;
2134                         if (get_user(cookie, (void __user * __user *)ptr))
2135                                 return -EFAULT;
2136
2137                         ptr += sizeof(void *);
2138                         list_for_each_entry(w, &proc->delivered_death, entry) {
2139                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2140                                 if (tmp_death->cookie == cookie) {
2141                                         death = tmp_death;
2142                                         break;
2143                                 }
2144                         }
2145                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2146                                      "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2147                                      proc->pid, thread->pid, cookie, death);
2148                         if (death == NULL) {
2149                                 binder_user_error("binder: %d:%d BC_DEAD"
2150                                         "_BINDER_DONE %p not found\n",
2151                                         proc->pid, thread->pid, cookie);
2152                                 break;
2153                         }
2154
2155                         list_del_init(&death->work.entry);
2156                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2157                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2158                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2159                                         list_add_tail(&death->work.entry, &thread->todo);
2160                                 } else {
2161                                         list_add_tail(&death->work.entry, &proc->todo);
2162                                         wake_up_interruptible(&proc->wait);
2163                                 }
2164                         }
2165                 } break;
2166
2167                 default:
2168                         printk(KERN_ERR "binder: %d:%d unknown command %d\n",
2169                                proc->pid, thread->pid, cmd);
2170                         return -EINVAL;
2171                 }
2172                 *consumed = ptr - buffer;
2173         }
2174         return 0;
2175 }
2176
2177 void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2178                     uint32_t cmd)
2179 {
2180         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2181                 binder_stats.br[_IOC_NR(cmd)]++;
2182                 proc->stats.br[_IOC_NR(cmd)]++;
2183                 thread->stats.br[_IOC_NR(cmd)]++;
2184         }
2185 }
2186
2187 static int binder_has_proc_work(struct binder_proc *proc,
2188                                 struct binder_thread *thread)
2189 {
2190         return !list_empty(&proc->todo) ||
2191                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2192 }
2193
2194 static int binder_has_thread_work(struct binder_thread *thread)
2195 {
2196         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2197                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2198 }
2199
2200 static int binder_thread_read(struct binder_proc *proc,
2201                               struct binder_thread *thread,
2202                               void  __user *buffer, int size,
2203                               signed long *consumed, int non_block)
2204 {
2205         void __user *ptr = buffer + *consumed;
2206         void __user *end = buffer + size;
2207
2208         int ret = 0;
2209         int wait_for_proc_work;
2210
2211         if (*consumed == 0) {
2212                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2213                         return -EFAULT;
2214                 ptr += sizeof(uint32_t);
2215         }
2216
2217 retry:
2218         wait_for_proc_work = thread->transaction_stack == NULL &&
2219                                 list_empty(&thread->todo);
2220
2221         if (thread->return_error != BR_OK && ptr < end) {
2222                 if (thread->return_error2 != BR_OK) {
2223                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2224                                 return -EFAULT;
2225                         ptr += sizeof(uint32_t);
2226                         if (ptr == end)
2227                                 goto done;
2228                         thread->return_error2 = BR_OK;
2229                 }
2230                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2231                         return -EFAULT;
2232                 ptr += sizeof(uint32_t);
2233                 thread->return_error = BR_OK;
2234                 goto done;
2235         }
2236
2237
2238         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2239         if (wait_for_proc_work)
2240                 proc->ready_threads++;
2241         mutex_unlock(&binder_lock);
2242         if (wait_for_proc_work) {
2243                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2244                                         BINDER_LOOPER_STATE_ENTERED))) {
2245                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
2246                                 "for process work before calling BC_REGISTER_"
2247                                 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2248                                 proc->pid, thread->pid, thread->looper);
2249                         wait_event_interruptible(binder_user_error_wait,
2250                                                  binder_stop_on_user_error < 2);
2251                 }
2252                 binder_set_nice(proc->default_priority);
2253                 if (non_block) {
2254                         if (!binder_has_proc_work(proc, thread))
2255                                 ret = -EAGAIN;
2256                 } else
2257                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2258         } else {
2259                 if (non_block) {
2260                         if (!binder_has_thread_work(thread))
2261                                 ret = -EAGAIN;
2262                 } else
2263                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2264         }
2265         mutex_lock(&binder_lock);
2266         if (wait_for_proc_work)
2267                 proc->ready_threads--;
2268         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2269
2270         if (ret)
2271                 return ret;
2272
2273         while (1) {
2274                 uint32_t cmd;
2275                 struct binder_transaction_data tr;
2276                 struct binder_work *w;
2277                 struct binder_transaction *t = NULL;
2278
2279                 if (!list_empty(&thread->todo))
2280                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2281                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2282                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2283                 else {
2284                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2285                                 goto retry;
2286                         break;
2287                 }
2288
2289                 if (end - ptr < sizeof(tr) + 4)
2290                         break;
2291
2292                 switch (w->type) {
2293                 case BINDER_WORK_TRANSACTION: {
2294                         t = container_of(w, struct binder_transaction, work);
2295                 } break;
2296                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2297                         cmd = BR_TRANSACTION_COMPLETE;
2298                         if (put_user(cmd, (uint32_t __user *)ptr))
2299                                 return -EFAULT;
2300                         ptr += sizeof(uint32_t);
2301
2302                         binder_stat_br(proc, thread, cmd);
2303                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2304                                      "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2305                                      proc->pid, thread->pid);
2306
2307                         list_del(&w->entry);
2308                         kfree(w);
2309                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2310                 } break;
2311                 case BINDER_WORK_NODE: {
2312                         struct binder_node *node = container_of(w, struct binder_node, work);
2313                         uint32_t cmd = BR_NOOP;
2314                         const char *cmd_name;
2315                         int strong = node->internal_strong_refs || node->local_strong_refs;
2316                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2317                         if (weak && !node->has_weak_ref) {
2318                                 cmd = BR_INCREFS;
2319                                 cmd_name = "BR_INCREFS";
2320                                 node->has_weak_ref = 1;
2321                                 node->pending_weak_ref = 1;
2322                                 node->local_weak_refs++;
2323                         } else if (strong && !node->has_strong_ref) {
2324                                 cmd = BR_ACQUIRE;
2325                                 cmd_name = "BR_ACQUIRE";
2326                                 node->has_strong_ref = 1;
2327                                 node->pending_strong_ref = 1;
2328                                 node->local_strong_refs++;
2329                         } else if (!strong && node->has_strong_ref) {
2330                                 cmd = BR_RELEASE;
2331                                 cmd_name = "BR_RELEASE";
2332                                 node->has_strong_ref = 0;
2333                         } else if (!weak && node->has_weak_ref) {
2334                                 cmd = BR_DECREFS;
2335                                 cmd_name = "BR_DECREFS";
2336                                 node->has_weak_ref = 0;
2337                         }
2338                         if (cmd != BR_NOOP) {
2339                                 if (put_user(cmd, (uint32_t __user *)ptr))
2340                                         return -EFAULT;
2341                                 ptr += sizeof(uint32_t);
2342                                 if (put_user(node->ptr, (void * __user *)ptr))
2343                                         return -EFAULT;
2344                                 ptr += sizeof(void *);
2345                                 if (put_user(node->cookie, (void * __user *)ptr))
2346                                         return -EFAULT;
2347                                 ptr += sizeof(void *);
2348
2349                                 binder_stat_br(proc, thread, cmd);
2350                                 binder_debug(BINDER_DEBUG_USER_REFS,
2351                                              "binder: %d:%d %s %d u%p c%p\n",
2352                                              proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2353                         } else {
2354                                 list_del_init(&w->entry);
2355                                 if (!weak && !strong) {
2356                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2357                                                      "binder: %d:%d node %d u%p c%p deleted\n",
2358                                                      proc->pid, thread->pid, node->debug_id,
2359                                                      node->ptr, node->cookie);
2360                                         rb_erase(&node->rb_node, &proc->nodes);
2361                                         kfree(node);
2362                                         binder_stats_deleted(BINDER_STAT_NODE);
2363                                 } else {
2364                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2365                                                      "binder: %d:%d node %d u%p c%p state unchanged\n",
2366                                                      proc->pid, thread->pid, node->debug_id, node->ptr,
2367                                                      node->cookie);
2368                                 }
2369                         }
2370                 } break;
2371                 case BINDER_WORK_DEAD_BINDER:
2372                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2373                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2374                         struct binder_ref_death *death;
2375                         uint32_t cmd;
2376
2377                         death = container_of(w, struct binder_ref_death, work);
2378                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2379                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2380                         else
2381                                 cmd = BR_DEAD_BINDER;
2382                         if (put_user(cmd, (uint32_t __user *)ptr))
2383                                 return -EFAULT;
2384                         ptr += sizeof(uint32_t);
2385                         if (put_user(death->cookie, (void * __user *)ptr))
2386                                 return -EFAULT;
2387                         ptr += sizeof(void *);
2388                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2389                                      "binder: %d:%d %s %p\n",
2390                                       proc->pid, thread->pid,
2391                                       cmd == BR_DEAD_BINDER ?
2392                                       "BR_DEAD_BINDER" :
2393                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2394                                       death->cookie);
2395
2396                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2397                                 list_del(&w->entry);
2398                                 kfree(death);
2399                                 binder_stats_deleted(BINDER_STAT_DEATH);
2400                         } else
2401                                 list_move(&w->entry, &proc->delivered_death);
2402                         if (cmd == BR_DEAD_BINDER)
2403                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2404                 } break;
2405                 }
2406
2407                 if (!t)
2408                         continue;
2409
2410                 BUG_ON(t->buffer == NULL);
2411                 if (t->buffer->target_node) {
2412                         struct binder_node *target_node = t->buffer->target_node;
2413                         tr.target.ptr = target_node->ptr;
2414                         tr.cookie =  target_node->cookie;
2415                         t->saved_priority = task_nice(current);
2416                         if (t->priority < target_node->min_priority &&
2417                             !(t->flags & TF_ONE_WAY))
2418                                 binder_set_nice(t->priority);
2419                         else if (!(t->flags & TF_ONE_WAY) ||
2420                                  t->saved_priority > target_node->min_priority)
2421                                 binder_set_nice(target_node->min_priority);
2422                         cmd = BR_TRANSACTION;
2423                 } else {
2424                         tr.target.ptr = NULL;
2425                         tr.cookie = NULL;
2426                         cmd = BR_REPLY;
2427                 }
2428                 tr.code = t->code;
2429                 tr.flags = t->flags;
2430                 tr.sender_euid = t->sender_euid;
2431
2432                 if (t->from) {
2433                         struct task_struct *sender = t->from->proc->tsk;
2434                         tr.sender_pid = task_tgid_nr_ns(sender,
2435                                                         current->nsproxy->pid_ns);
2436                 } else {
2437                         tr.sender_pid = 0;
2438                 }
2439
2440                 tr.data_size = t->buffer->data_size;
2441                 tr.offsets_size = t->buffer->offsets_size;
2442                 tr.data.ptr.buffer = (void *)t->buffer->data +
2443                                         proc->user_buffer_offset;
2444                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2445                                         ALIGN(t->buffer->data_size,
2446                                             sizeof(void *));
2447
2448                 if (put_user(cmd, (uint32_t __user *)ptr))
2449                         return -EFAULT;
2450                 ptr += sizeof(uint32_t);
2451                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2452                         return -EFAULT;
2453                 ptr += sizeof(tr);
2454
2455                 binder_stat_br(proc, thread, cmd);
2456                 binder_debug(BINDER_DEBUG_TRANSACTION,
2457                              "binder: %d:%d %s %d %d:%d, cmd %d"
2458                              "size %zd-%zd ptr %p-%p\n",
2459                              proc->pid, thread->pid,
2460                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2461                              "BR_REPLY",
2462                              t->debug_id, t->from ? t->from->proc->pid : 0,
2463                              t->from ? t->from->pid : 0, cmd,
2464                              t->buffer->data_size, t->buffer->offsets_size,
2465                              tr.data.ptr.buffer, tr.data.ptr.offsets);
2466
2467                 list_del(&t->work.entry);
2468                 t->buffer->allow_user_free = 1;
2469                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2470                         t->to_parent = thread->transaction_stack;
2471                         t->to_thread = thread;
2472                         thread->transaction_stack = t;
2473                 } else {
2474                         t->buffer->transaction = NULL;
2475                         kfree(t);
2476                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2477                 }
2478                 break;
2479         }
2480
2481 done:
2482
2483         *consumed = ptr - buffer;
2484         if (proc->requested_threads + proc->ready_threads == 0 &&
2485             proc->requested_threads_started < proc->max_threads &&
2486             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2487              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2488              /*spawn a new thread if we leave this out */) {
2489                 proc->requested_threads++;
2490                 binder_debug(BINDER_DEBUG_THREADS,
2491                              "binder: %d:%d BR_SPAWN_LOOPER\n",
2492                              proc->pid, thread->pid);
2493                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2494                         return -EFAULT;
2495         }
2496         return 0;
2497 }
2498
2499 static void binder_release_work(struct list_head *list)
2500 {
2501         struct binder_work *w;
2502         while (!list_empty(list)) {
2503                 w = list_first_entry(list, struct binder_work, entry);
2504                 list_del_init(&w->entry);
2505                 switch (w->type) {
2506                 case BINDER_WORK_TRANSACTION: {
2507                         struct binder_transaction *t;
2508
2509                         t = container_of(w, struct binder_transaction, work);
2510                         if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
2511                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2512                 } break;
2513                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2514                         kfree(w);
2515                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2516                 } break;
2517                 default:
2518                         break;
2519                 }
2520         }
2521
2522 }
2523
2524 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2525 {
2526         struct binder_thread *thread = NULL;
2527         struct rb_node *parent = NULL;
2528         struct rb_node **p = &proc->threads.rb_node;
2529
2530         while (*p) {
2531                 parent = *p;
2532                 thread = rb_entry(parent, struct binder_thread, rb_node);
2533
2534                 if (current->pid < thread->pid)
2535                         p = &(*p)->rb_left;
2536                 else if (current->pid > thread->pid)
2537                         p = &(*p)->rb_right;
2538                 else
2539                         break;
2540         }
2541         if (*p == NULL) {
2542                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2543                 if (thread == NULL)
2544                         return NULL;
2545                 binder_stats_created(BINDER_STAT_THREAD);
2546                 thread->proc = proc;
2547                 thread->pid = current->pid;
2548                 init_waitqueue_head(&thread->wait);
2549                 INIT_LIST_HEAD(&thread->todo);
2550                 rb_link_node(&thread->rb_node, parent, p);
2551                 rb_insert_color(&thread->rb_node, &proc->threads);
2552                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2553                 thread->return_error = BR_OK;
2554                 thread->return_error2 = BR_OK;
2555         }
2556         return thread;
2557 }
2558
2559 static int binder_free_thread(struct binder_proc *proc,
2560                               struct binder_thread *thread)
2561 {
2562         struct binder_transaction *t;
2563         struct binder_transaction *send_reply = NULL;
2564         int active_transactions = 0;
2565
2566         rb_erase(&thread->rb_node, &proc->threads);
2567         t = thread->transaction_stack;
2568         if (t && t->to_thread == thread)
2569                 send_reply = t;
2570         while (t) {
2571                 active_transactions++;
2572                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2573                              "binder: release %d:%d transaction %d "
2574                              "%s, still active\n", proc->pid, thread->pid,
2575                              t->debug_id,
2576                              (t->to_thread == thread) ? "in" : "out");
2577
2578                 if (t->to_thread == thread) {
2579                         t->to_proc = NULL;
2580                         t->to_thread = NULL;
2581                         if (t->buffer) {
2582                                 t->buffer->transaction = NULL;
2583                                 t->buffer = NULL;
2584                         }
2585                         t = t->to_parent;
2586                 } else if (t->from == thread) {
2587                         t->from = NULL;
2588                         t = t->from_parent;
2589                 } else
2590                         BUG();
2591         }
2592         if (send_reply)
2593                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2594         binder_release_work(&thread->todo);
2595         kfree(thread);
2596         binder_stats_deleted(BINDER_STAT_THREAD);
2597         return active_transactions;
2598 }
2599
2600 static unsigned int binder_poll(struct file *filp,
2601                                 struct poll_table_struct *wait)
2602 {
2603         struct binder_proc *proc = filp->private_data;
2604         struct binder_thread *thread = NULL;
2605         int wait_for_proc_work;
2606
2607         mutex_lock(&binder_lock);
2608         thread = binder_get_thread(proc);
2609
2610         wait_for_proc_work = thread->transaction_stack == NULL &&
2611                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2612         mutex_unlock(&binder_lock);
2613
2614         if (wait_for_proc_work) {
2615                 if (binder_has_proc_work(proc, thread))
2616                         return POLLIN;
2617                 poll_wait(filp, &proc->wait, wait);
2618                 if (binder_has_proc_work(proc, thread))
2619                         return POLLIN;
2620         } else {
2621                 if (binder_has_thread_work(thread))
2622                         return POLLIN;
2623                 poll_wait(filp, &thread->wait, wait);
2624                 if (binder_has_thread_work(thread))
2625                         return POLLIN;
2626         }
2627         return 0;
2628 }
2629
2630 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2631 {
2632         int ret;
2633         struct binder_proc *proc = filp->private_data;
2634         struct binder_thread *thread;
2635         unsigned int size = _IOC_SIZE(cmd);
2636         void __user *ubuf = (void __user *)arg;
2637
2638         /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2639
2640         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2641         if (ret)
2642                 return ret;
2643
2644         mutex_lock(&binder_lock);
2645         thread = binder_get_thread(proc);
2646         if (thread == NULL) {
2647                 ret = -ENOMEM;
2648                 goto err;
2649         }
2650
2651         switch (cmd) {
2652         case BINDER_WRITE_READ: {
2653                 struct binder_write_read bwr;
2654                 if (size != sizeof(struct binder_write_read)) {
2655                         ret = -EINVAL;
2656                         goto err;
2657                 }
2658                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2659                         ret = -EFAULT;
2660                         goto err;
2661                 }
2662                 binder_debug(BINDER_DEBUG_READ_WRITE,
2663                              "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2664                              proc->pid, thread->pid, bwr.write_size, bwr.write_buffer,
2665                              bwr.read_size, bwr.read_buffer);
2666
2667                 if (bwr.write_size > 0) {
2668                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2669                         if (ret < 0) {
2670                                 bwr.read_consumed = 0;
2671                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2672                                         ret = -EFAULT;
2673                                 goto err;
2674                         }
2675                 }
2676                 if (bwr.read_size > 0) {
2677                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2678                         if (!list_empty(&proc->todo))
2679                                 wake_up_interruptible(&proc->wait);
2680                         if (ret < 0) {
2681                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2682                                         ret = -EFAULT;
2683                                 goto err;
2684                         }
2685                 }
2686                 binder_debug(BINDER_DEBUG_READ_WRITE,
2687                              "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2688                              proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2689                              bwr.read_consumed, bwr.read_size);
2690                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2691                         ret = -EFAULT;
2692                         goto err;
2693                 }
2694                 break;
2695         }
2696         case BINDER_SET_MAX_THREADS:
2697                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2698                         ret = -EINVAL;
2699                         goto err;
2700                 }
2701                 break;
2702         case BINDER_SET_CONTEXT_MGR:
2703                 if (binder_context_mgr_node != NULL) {
2704                         printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set\n");
2705                         ret = -EBUSY;
2706                         goto err;
2707                 }
2708                 if (binder_context_mgr_uid != -1) {
2709                         if (binder_context_mgr_uid != current->cred->euid) {
2710                                 printk(KERN_ERR "binder: BINDER_SET_"
2711                                        "CONTEXT_MGR bad uid %d != %d\n",
2712                                        current->cred->euid,
2713                                        binder_context_mgr_uid);
2714                                 ret = -EPERM;
2715                                 goto err;
2716                         }
2717                 } else
2718                         binder_context_mgr_uid = current->cred->euid;
2719                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2720                 if (binder_context_mgr_node == NULL) {
2721                         ret = -ENOMEM;
2722                         goto err;
2723                 }
2724                 binder_context_mgr_node->local_weak_refs++;
2725                 binder_context_mgr_node->local_strong_refs++;
2726                 binder_context_mgr_node->has_strong_ref = 1;
2727                 binder_context_mgr_node->has_weak_ref = 1;
2728                 break;
2729         case BINDER_THREAD_EXIT:
2730                 binder_debug(BINDER_DEBUG_THREADS, "binder: %d:%d exit\n",
2731                              proc->pid, thread->pid);
2732                 binder_free_thread(proc, thread);
2733                 thread = NULL;
2734                 break;
2735         case BINDER_VERSION:
2736                 if (size != sizeof(struct binder_version)) {
2737                         ret = -EINVAL;
2738                         goto err;
2739                 }
2740                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2741                         ret = -EINVAL;
2742                         goto err;
2743                 }
2744                 break;
2745         default:
2746                 ret = -EINVAL;
2747                 goto err;
2748         }
2749         ret = 0;
2750 err:
2751         if (thread)
2752                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2753         mutex_unlock(&binder_lock);
2754         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2755         if (ret && ret != -ERESTARTSYS)
2756                 printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2757         return ret;
2758 }
2759
2760 static void binder_vma_open(struct vm_area_struct *vma)
2761 {
2762         struct binder_proc *proc = vma->vm_private_data;
2763         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2764                      "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2765                      proc->pid, vma->vm_start, vma->vm_end,
2766                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2767                      (unsigned long)pgprot_val(vma->vm_page_prot));
2768 }
2769
2770 static void binder_vma_close(struct vm_area_struct *vma)
2771 {
2772         struct binder_proc *proc = vma->vm_private_data;
2773         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2774                      "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2775                      proc->pid, vma->vm_start, vma->vm_end,
2776                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2777                      (unsigned long)pgprot_val(vma->vm_page_prot));
2778         proc->vma = NULL;
2779         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2780 }
2781
2782 static struct vm_operations_struct binder_vm_ops = {
2783         .open = binder_vma_open,
2784         .close = binder_vma_close,
2785 };
2786
2787 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2788 {
2789         int ret;
2790         struct vm_struct *area;
2791         struct binder_proc *proc = filp->private_data;
2792         const char *failure_string;
2793         struct binder_buffer *buffer;
2794
2795         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2796                 vma->vm_end = vma->vm_start + SZ_4M;
2797
2798         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2799                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2800                      proc->pid, vma->vm_start, vma->vm_end,
2801                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2802                      (unsigned long)pgprot_val(vma->vm_page_prot));
2803
2804         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2805                 ret = -EPERM;
2806                 failure_string = "bad vm_flags";
2807                 goto err_bad_arg;
2808         }
2809         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2810
2811         mutex_lock(&binder_mmap_lock);
2812         if (proc->buffer) {
2813                 ret = -EBUSY;
2814                 failure_string = "already mapped";
2815                 goto err_already_mapped;
2816         }
2817
2818         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2819         if (area == NULL) {
2820                 ret = -ENOMEM;
2821                 failure_string = "get_vm_area";
2822                 goto err_get_vm_area_failed;
2823         }
2824         proc->buffer = area->addr;
2825         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2826         mutex_unlock(&binder_mmap_lock);
2827
2828 #ifdef CONFIG_CPU_CACHE_VIPT
2829         if (cache_is_vipt_aliasing()) {
2830                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2831                         printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2832                         vma->vm_start += PAGE_SIZE;
2833                 }
2834         }
2835 #endif
2836         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2837         if (proc->pages == NULL) {
2838                 ret = -ENOMEM;
2839                 failure_string = "alloc page array";
2840                 goto err_alloc_pages_failed;
2841         }
2842         proc->buffer_size = vma->vm_end - vma->vm_start;
2843
2844         vma->vm_ops = &binder_vm_ops;
2845         vma->vm_private_data = proc;
2846
2847         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2848                 ret = -ENOMEM;
2849                 failure_string = "alloc small buf";
2850                 goto err_alloc_small_buf_failed;
2851         }
2852         buffer = proc->buffer;
2853         INIT_LIST_HEAD(&proc->buffers);
2854         list_add(&buffer->entry, &proc->buffers);
2855         buffer->free = 1;
2856         binder_insert_free_buffer(proc, buffer);
2857         proc->free_async_space = proc->buffer_size / 2;
2858         barrier();
2859         proc->files = get_files_struct(proc->tsk);
2860         proc->vma = vma;
2861
2862         /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n",
2863                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2864         return 0;
2865
2866 err_alloc_small_buf_failed:
2867         kfree(proc->pages);
2868         proc->pages = NULL;
2869 err_alloc_pages_failed:
2870         mutex_lock(&binder_mmap_lock);
2871         vfree(proc->buffer);
2872         proc->buffer = NULL;
2873 err_get_vm_area_failed:
2874 err_already_mapped:
2875         mutex_unlock(&binder_mmap_lock);
2876 err_bad_arg:
2877         printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n",
2878                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2879         return ret;
2880 }
2881
2882 static int binder_open(struct inode *nodp, struct file *filp)
2883 {
2884         struct binder_proc *proc;
2885
2886         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2887                      current->group_leader->pid, current->pid);
2888
2889         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2890         if (proc == NULL)
2891                 return -ENOMEM;
2892         get_task_struct(current);
2893         proc->tsk = current;
2894         INIT_LIST_HEAD(&proc->todo);
2895         init_waitqueue_head(&proc->wait);
2896         proc->default_priority = task_nice(current);
2897         mutex_lock(&binder_lock);
2898         binder_stats_created(BINDER_STAT_PROC);
2899         hlist_add_head(&proc->proc_node, &binder_procs);
2900         proc->pid = current->group_leader->pid;
2901         INIT_LIST_HEAD(&proc->delivered_death);
2902         filp->private_data = proc;
2903         mutex_unlock(&binder_lock);
2904
2905         if (binder_debugfs_dir_entry_proc) {
2906                 char strbuf[11];
2907                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2908                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2909                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2910         }
2911
2912         return 0;
2913 }
2914
2915 static int binder_flush(struct file *filp, fl_owner_t id)
2916 {
2917         struct binder_proc *proc = filp->private_data;
2918
2919         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2920
2921         return 0;
2922 }
2923
2924 static void binder_deferred_flush(struct binder_proc *proc)
2925 {
2926         struct rb_node *n;
2927         int wake_count = 0;
2928         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2929                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2930                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2931                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2932                         wake_up_interruptible(&thread->wait);
2933                         wake_count++;
2934                 }
2935         }
2936         wake_up_interruptible_all(&proc->wait);
2937
2938         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2939                      "binder_flush: %d woke %d threads\n", proc->pid,
2940                      wake_count);
2941 }
2942
2943 static int binder_release(struct inode *nodp, struct file *filp)
2944 {
2945         struct binder_proc *proc = filp->private_data;
2946         debugfs_remove(proc->debugfs_entry);
2947         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2948
2949         return 0;
2950 }
2951
2952 static void binder_deferred_release(struct binder_proc *proc)
2953 {
2954         struct hlist_node *pos;
2955         struct binder_transaction *t;
2956         struct rb_node *n;
2957         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2958
2959         BUG_ON(proc->vma);
2960         BUG_ON(proc->files);
2961
2962         hlist_del(&proc->proc_node);
2963         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2964                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2965                              "binder_release: %d context_mgr_node gone\n",
2966                              proc->pid);
2967                 binder_context_mgr_node = NULL;
2968         }
2969
2970         threads = 0;
2971         active_transactions = 0;
2972         while ((n = rb_first(&proc->threads))) {
2973                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2974                 threads++;
2975                 active_transactions += binder_free_thread(proc, thread);
2976         }
2977         nodes = 0;
2978         incoming_refs = 0;
2979         while ((n = rb_first(&proc->nodes))) {
2980                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2981
2982                 nodes++;
2983                 rb_erase(&node->rb_node, &proc->nodes);
2984                 list_del_init(&node->work.entry);
2985                 if (hlist_empty(&node->refs)) {
2986                         kfree(node);
2987                         binder_stats_deleted(BINDER_STAT_NODE);
2988                 } else {
2989                         struct binder_ref *ref;
2990                         int death = 0;
2991
2992                         node->proc = NULL;
2993                         node->local_strong_refs = 0;
2994                         node->local_weak_refs = 0;
2995                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2996
2997                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2998                                 incoming_refs++;
2999                                 if (ref->death) {
3000                                         death++;
3001                                         if (list_empty(&ref->death->work.entry)) {
3002                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3003                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
3004                                                 wake_up_interruptible(&ref->proc->wait);
3005                                         } else
3006                                                 BUG();
3007                                 }
3008                         }
3009                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3010                                      "binder: node %d now dead, "
3011                                      "refs %d, death %d\n", node->debug_id,
3012                                      incoming_refs, death);
3013                 }
3014         }
3015         outgoing_refs = 0;
3016         while ((n = rb_first(&proc->refs_by_desc))) {
3017                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3018                                                   rb_node_desc);
3019                 outgoing_refs++;
3020                 binder_delete_ref(ref);
3021         }
3022         binder_release_work(&proc->todo);
3023         buffers = 0;
3024
3025         while ((n = rb_first(&proc->allocated_buffers))) {
3026                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
3027                                                         rb_node);
3028                 t = buffer->transaction;
3029                 if (t) {
3030                         t->buffer = NULL;
3031                         buffer->transaction = NULL;
3032                         printk(KERN_ERR "binder: release proc %d, "
3033                                "transaction %d, not freed\n",
3034                                proc->pid, t->debug_id);
3035                         /*BUG();*/
3036                 }
3037                 binder_free_buf(proc, buffer);
3038                 buffers++;
3039         }
3040
3041         binder_stats_deleted(BINDER_STAT_PROC);
3042
3043         page_count = 0;
3044         if (proc->pages) {
3045                 int i;
3046                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3047                         if (proc->pages[i]) {
3048                                 void *page_addr = proc->buffer + i * PAGE_SIZE;
3049                                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3050                                              "binder_release: %d: "
3051                                              "page %d at %p not freed\n",
3052                                              proc->pid, i,
3053                                              page_addr);
3054                                 unmap_kernel_range((unsigned long)page_addr,
3055                                         PAGE_SIZE);
3056                                 __free_page(proc->pages[i]);
3057                                 page_count++;
3058                         }
3059                 }
3060                 kfree(proc->pages);
3061                 vfree(proc->buffer);
3062         }
3063
3064         put_task_struct(proc->tsk);
3065
3066         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3067                      "binder_release: %d threads %d, nodes %d (ref %d), "
3068                      "refs %d, active transactions %d, buffers %d, "
3069                      "pages %d\n",
3070                      proc->pid, threads, nodes, incoming_refs, outgoing_refs,
3071                      active_transactions, buffers, page_count);
3072
3073         kfree(proc);
3074 }
3075
3076 static void binder_deferred_func(struct work_struct *work)
3077 {
3078         struct binder_proc *proc;
3079         struct files_struct *files;
3080
3081         int defer;
3082         do {
3083                 mutex_lock(&binder_lock);
3084                 mutex_lock(&binder_deferred_lock);
3085                 if (!hlist_empty(&binder_deferred_list)) {
3086                         proc = hlist_entry(binder_deferred_list.first,
3087                                         struct binder_proc, deferred_work_node);
3088                         hlist_del_init(&proc->deferred_work_node);
3089                         defer = proc->deferred_work;
3090                         proc->deferred_work = 0;
3091                 } else {
3092                         proc = NULL;
3093                         defer = 0;
3094                 }
3095                 mutex_unlock(&binder_deferred_lock);
3096
3097                 files = NULL;
3098                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3099                         files = proc->files;
3100                         if (files)
3101                                 proc->files = NULL;
3102                 }
3103
3104                 if (defer & BINDER_DEFERRED_FLUSH)
3105                         binder_deferred_flush(proc);
3106
3107                 if (defer & BINDER_DEFERRED_RELEASE)
3108                         binder_deferred_release(proc); /* frees proc */
3109
3110                 mutex_unlock(&binder_lock);
3111                 if (files)
3112                         put_files_struct(files);
3113         } while (proc);
3114 }
3115 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3116
3117 static void
3118 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3119 {
3120         mutex_lock(&binder_deferred_lock);
3121         proc->deferred_work |= defer;
3122         if (hlist_unhashed(&proc->deferred_work_node)) {
3123                 hlist_add_head(&proc->deferred_work_node,
3124                                 &binder_deferred_list);
3125                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3126         }
3127         mutex_unlock(&binder_deferred_lock);
3128 }
3129
3130 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3131                                      struct binder_transaction *t)
3132 {
3133         seq_printf(m,
3134                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3135                    prefix, t->debug_id, t,
3136                    t->from ? t->from->proc->pid : 0,
3137                    t->from ? t->from->pid : 0,
3138                    t->to_proc ? t->to_proc->pid : 0,
3139                    t->to_thread ? t->to_thread->pid : 0,
3140                    t->code, t->flags, t->priority, t->need_reply);
3141         if (t->buffer == NULL) {
3142                 seq_puts(m, " buffer free\n");
3143                 return;
3144         }
3145         if (t->buffer->target_node)
3146                 seq_printf(m, " node %d",
3147                            t->buffer->target_node->debug_id);
3148         seq_printf(m, " size %zd:%zd data %p\n",
3149                    t->buffer->data_size, t->buffer->offsets_size,
3150                    t->buffer->data);
3151 }
3152
3153 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3154                                 struct binder_buffer *buffer)
3155 {
3156         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3157                    prefix, buffer->debug_id, buffer->data,
3158                    buffer->data_size, buffer->offsets_size,
3159                    buffer->transaction ? "active" : "delivered");
3160 }
3161
3162 static void print_binder_work(struct seq_file *m, const char *prefix,
3163                               const char *transaction_prefix,
3164                               struct binder_work *w)
3165 {
3166         struct binder_node *node;
3167         struct binder_transaction *t;
3168
3169         switch (w->type) {
3170         case BINDER_WORK_TRANSACTION:
3171                 t = container_of(w, struct binder_transaction, work);
3172                 print_binder_transaction(m, transaction_prefix, t);
3173                 break;
3174         case BINDER_WORK_TRANSACTION_COMPLETE:
3175                 seq_printf(m, "%stransaction complete\n", prefix);
3176                 break;
3177         case BINDER_WORK_NODE:
3178                 node = container_of(w, struct binder_node, work);
3179                 seq_printf(m, "%snode work %d: u%p c%p\n",
3180                            prefix, node->debug_id, node->ptr, node->cookie);
3181                 break;
3182         case BINDER_WORK_DEAD_BINDER:
3183                 seq_printf(m, "%shas dead binder\n", prefix);
3184                 break;
3185         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3186                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3187                 break;
3188         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3189                 seq_printf(m, "%shas cleared death notification\n", prefix);
3190                 break;
3191         default:
3192                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3193                 break;
3194         }
3195 }
3196
3197 static void print_binder_thread(struct seq_file *m,
3198                                 struct binder_thread *thread,
3199                                 int print_always)
3200 {
3201         struct binder_transaction *t;
3202         struct binder_work *w;
3203         size_t start_pos = m->count;
3204         size_t header_pos;
3205
3206         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3207         header_pos = m->count;
3208         t = thread->transaction_stack;
3209         while (t) {
3210                 if (t->from == thread) {
3211                         print_binder_transaction(m,
3212                                                  "    outgoing transaction", t);
3213                         t = t->from_parent;
3214                 } else if (t->to_thread == thread) {
3215                         print_binder_transaction(m,
3216                                                  "    incoming transaction", t);
3217                         t = t->to_parent;
3218                 } else {
3219                         print_binder_transaction(m, "    bad transaction", t);
3220                         t = NULL;
3221                 }
3222         }
3223         list_for_each_entry(w, &thread->todo, entry) {
3224                 print_binder_work(m, "    ", "    pending transaction", w);
3225         }
3226         if (!print_always && m->count == header_pos)
3227                 m->count = start_pos;
3228 }
3229
3230 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3231 {
3232         struct binder_ref *ref;
3233         struct hlist_node *pos;
3234         struct binder_work *w;
3235         int count;
3236
3237         count = 0;
3238         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3239                 count++;
3240
3241         seq_printf(m, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3242                    node->debug_id, node->ptr, node->cookie,
3243                    node->has_strong_ref, node->has_weak_ref,
3244                    node->local_strong_refs, node->local_weak_refs,
3245                    node->internal_strong_refs, count);
3246         if (count) {
3247                 seq_puts(m, " proc");
3248                 hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3249                         seq_printf(m, " %d", ref->proc->pid);
3250         }
3251         seq_puts(m, "\n");
3252         list_for_each_entry(w, &node->async_todo, entry)
3253                 print_binder_work(m, "    ",
3254                                   "    pending async transaction", w);
3255 }
3256
3257 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3258 {
3259         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3260                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3261                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3262 }
3263
3264 static void print_binder_proc(struct seq_file *m,
3265                               struct binder_proc *proc, int print_all)
3266 {
3267         struct binder_work *w;
3268         struct rb_node *n;
3269         size_t start_pos = m->count;
3270         size_t header_pos;
3271
3272         seq_printf(m, "proc %d\n", proc->pid);
3273         header_pos = m->count;
3274
3275         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3276                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3277                                                 rb_node), print_all);
3278         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3279                 struct binder_node *node = rb_entry(n, struct binder_node,
3280                                                     rb_node);
3281                 if (print_all || node->has_async_transaction)
3282                         print_binder_node(m, node);
3283         }
3284         if (print_all) {
3285                 for (n = rb_first(&proc->refs_by_desc);
3286                      n != NULL;
3287                      n = rb_next(n))
3288                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3289                                                      rb_node_desc));
3290         }
3291         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3292                 print_binder_buffer(m, "  buffer",
3293                                     rb_entry(n, struct binder_buffer, rb_node));
3294         list_for_each_entry(w, &proc->todo, entry)
3295                 print_binder_work(m, "  ", "  pending transaction", w);
3296         list_for_each_entry(w, &proc->delivered_death, entry) {
3297                 seq_puts(m, "  has delivered dead binder\n");
3298                 break;
3299         }
3300         if (!print_all && m->count == header_pos)
3301                 m->count = start_pos;
3302 }
3303
3304 static const char *binder_return_strings[] = {
3305         "BR_ERROR",
3306         "BR_OK",
3307         "BR_TRANSACTION",
3308         "BR_REPLY",
3309         "BR_ACQUIRE_RESULT",
3310         "BR_DEAD_REPLY",
3311         "BR_TRANSACTION_COMPLETE",
3312         "BR_INCREFS",
3313         "BR_ACQUIRE",
3314         "BR_RELEASE",
3315         "BR_DECREFS",
3316         "BR_ATTEMPT_ACQUIRE",
3317         "BR_NOOP",
3318         "BR_SPAWN_LOOPER",
3319         "BR_FINISHED",
3320         "BR_DEAD_BINDER",
3321         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3322         "BR_FAILED_REPLY"
3323 };
3324
3325 static const char *binder_command_strings[] = {
3326         "BC_TRANSACTION",
3327         "BC_REPLY",
3328         "BC_ACQUIRE_RESULT",
3329         "BC_FREE_BUFFER",
3330         "BC_INCREFS",
3331         "BC_ACQUIRE",
3332         "BC_RELEASE",
3333         "BC_DECREFS",
3334         "BC_INCREFS_DONE",
3335         "BC_ACQUIRE_DONE",
3336         "BC_ATTEMPT_ACQUIRE",
3337         "BC_REGISTER_LOOPER",
3338         "BC_ENTER_LOOPER",
3339         "BC_EXIT_LOOPER",
3340         "BC_REQUEST_DEATH_NOTIFICATION",
3341         "BC_CLEAR_DEATH_NOTIFICATION",
3342         "BC_DEAD_BINDER_DONE"
3343 };
3344
3345 static const char *binder_objstat_strings[] = {
3346         "proc",
3347         "thread",
3348         "node",
3349         "ref",
3350         "death",
3351         "transaction",
3352         "transaction_complete"
3353 };
3354
3355 static void print_binder_stats(struct seq_file *m, const char *prefix,
3356                                struct binder_stats *stats)
3357 {
3358         int i;
3359
3360         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3361                      ARRAY_SIZE(binder_command_strings));
3362         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3363                 if (stats->bc[i])
3364                         seq_printf(m, "%s%s: %d\n", prefix,
3365                                    binder_command_strings[i], stats->bc[i]);
3366         }
3367
3368         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3369                      ARRAY_SIZE(binder_return_strings));
3370         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3371                 if (stats->br[i])
3372                         seq_printf(m, "%s%s: %d\n", prefix,
3373                                    binder_return_strings[i], stats->br[i]);
3374         }
3375
3376         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3377                      ARRAY_SIZE(binder_objstat_strings));
3378         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3379                      ARRAY_SIZE(stats->obj_deleted));
3380         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3381                 if (stats->obj_created[i] || stats->obj_deleted[i])
3382                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3383                                 binder_objstat_strings[i],
3384                                 stats->obj_created[i] - stats->obj_deleted[i],
3385                                 stats->obj_created[i]);
3386         }
3387 }
3388
3389 static void print_binder_proc_stats(struct seq_file *m,
3390                                     struct binder_proc *proc)
3391 {
3392         struct binder_work *w;
3393         struct rb_node *n;
3394         int count, strong, weak;
3395
3396         seq_printf(m, "proc %d\n", proc->pid);
3397         count = 0;
3398         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3399                 count++;
3400         seq_printf(m, "  threads: %d\n", count);
3401         seq_printf(m, "  requested threads: %d+%d/%d\n"
3402                         "  ready threads %d\n"
3403                         "  free async space %zd\n", proc->requested_threads,
3404                         proc->requested_threads_started, proc->max_threads,
3405                         proc->ready_threads, proc->free_async_space);
3406         count = 0;
3407         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3408                 count++;
3409         seq_printf(m, "  nodes: %d\n", count);
3410         count = 0;
3411         strong = 0;
3412         weak = 0;
3413         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3414                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3415                                                   rb_node_desc);
3416                 count++;
3417                 strong += ref->strong;
3418                 weak += ref->weak;
3419         }
3420         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3421
3422         count = 0;
3423         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3424                 count++;
3425         seq_printf(m, "  buffers: %d\n", count);
3426
3427         count = 0;
3428         list_for_each_entry(w, &proc->todo, entry) {
3429                 switch (w->type) {
3430                 case BINDER_WORK_TRANSACTION:
3431                         count++;
3432                         break;
3433                 default:
3434                         break;
3435                 }
3436         }
3437         seq_printf(m, "  pending transactions: %d\n", count);
3438
3439         print_binder_stats(m, "  ", &proc->stats);
3440 }
3441
3442
3443 static int binder_state_show(struct seq_file *m, void *unused)
3444 {
3445         struct binder_proc *proc;
3446         struct hlist_node *pos;
3447         struct binder_node *node;
3448         int do_lock = !binder_debug_no_lock;
3449
3450         if (do_lock)
3451                 mutex_lock(&binder_lock);
3452
3453         seq_puts(m, "binder state:\n");
3454
3455         if (!hlist_empty(&binder_dead_nodes))
3456                 seq_puts(m, "dead nodes:\n");
3457         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node)
3458                 print_binder_node(m, node);
3459
3460         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3461                 print_binder_proc(m, proc, 1);
3462         if (do_lock)
3463                 mutex_unlock(&binder_lock);
3464         return 0;
3465 }
3466
3467 static int binder_stats_show(struct seq_file *m, void *unused)
3468 {
3469         struct binder_proc *proc;
3470         struct hlist_node *pos;
3471         int do_lock = !binder_debug_no_lock;
3472
3473         if (do_lock)
3474                 mutex_lock(&binder_lock);
3475
3476         seq_puts(m, "binder stats:\n");
3477
3478         print_binder_stats(m, "", &binder_stats);
3479
3480         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3481                 print_binder_proc_stats(m, proc);
3482         if (do_lock)
3483                 mutex_unlock(&binder_lock);
3484         return 0;
3485 }
3486
3487 static int binder_transactions_show(struct seq_file *m, void *unused)
3488 {
3489         struct binder_proc *proc;
3490         struct hlist_node *pos;
3491         int do_lock = !binder_debug_no_lock;
3492
3493         if (do_lock)
3494                 mutex_lock(&binder_lock);
3495
3496         seq_puts(m, "binder transactions:\n");
3497         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3498                 print_binder_proc(m, proc, 0);
3499         if (do_lock)
3500                 mutex_unlock(&binder_lock);
3501         return 0;
3502 }
3503
3504 static int binder_proc_show(struct seq_file *m, void *unused)
3505 {
3506         struct binder_proc *proc = m->private;
3507         int do_lock = !binder_debug_no_lock;
3508
3509         if (do_lock)
3510                 mutex_lock(&binder_lock);
3511         seq_puts(m, "binder proc state:\n");
3512         print_binder_proc(m, proc, 1);
3513         if (do_lock)
3514                 mutex_unlock(&binder_lock);
3515         return 0;
3516 }
3517
3518 static void print_binder_transaction_log_entry(struct seq_file *m,
3519                                         struct binder_transaction_log_entry *e)
3520 {
3521         seq_printf(m,
3522                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3523                    e->debug_id, (e->call_type == 2) ? "reply" :
3524                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3525                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3526                    e->target_handle, e->data_size, e->offsets_size);
3527 }
3528
3529 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3530 {
3531         struct binder_transaction_log *log = m->private;
3532         int i;
3533
3534         if (log->full) {
3535                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3536                         print_binder_transaction_log_entry(m, &log->entry[i]);
3537         }
3538         for (i = 0; i < log->next; i++)
3539                 print_binder_transaction_log_entry(m, &log->entry[i]);
3540         return 0;
3541 }
3542
3543 static const struct file_operations binder_fops = {
3544         .owner = THIS_MODULE,
3545         .poll = binder_poll,
3546         .unlocked_ioctl = binder_ioctl,
3547         .mmap = binder_mmap,
3548         .open = binder_open,
3549         .flush = binder_flush,
3550         .release = binder_release,
3551 };
3552
3553 static struct miscdevice binder_miscdev = {
3554         .minor = MISC_DYNAMIC_MINOR,
3555         .name = "binder",
3556         .fops = &binder_fops
3557 };
3558
3559 BINDER_DEBUG_ENTRY(state);
3560 BINDER_DEBUG_ENTRY(stats);
3561 BINDER_DEBUG_ENTRY(transactions);
3562 BINDER_DEBUG_ENTRY(transaction_log);
3563
3564 static int __init binder_init(void)
3565 {
3566         int ret;
3567
3568         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3569         if (!binder_deferred_workqueue)
3570                 return -ENOMEM;
3571
3572         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3573         if (binder_debugfs_dir_entry_root)
3574                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3575                                                  binder_debugfs_dir_entry_root);
3576         ret = misc_register(&binder_miscdev);
3577         if (binder_debugfs_dir_entry_root) {
3578                 debugfs_create_file("state",
3579                                     S_IRUGO,
3580                                     binder_debugfs_dir_entry_root,
3581                                     NULL,
3582                                     &binder_state_fops);
3583                 debugfs_create_file("stats",
3584                                     S_IRUGO,
3585                                     binder_debugfs_dir_entry_root,
3586                                     NULL,
3587                                     &binder_stats_fops);
3588                 debugfs_create_file("transactions",
3589                                     S_IRUGO,
3590                                     binder_debugfs_dir_entry_root,
3591                                     NULL,
3592                                     &binder_transactions_fops);
3593                 debugfs_create_file("transaction_log",
3594                                     S_IRUGO,
3595                                     binder_debugfs_dir_entry_root,
3596                                     &binder_transaction_log,
3597                                     &binder_transaction_log_fops);
3598                 debugfs_create_file("failed_transaction_log",
3599                                     S_IRUGO,
3600                                     binder_debugfs_dir_entry_root,
3601                                     &binder_transaction_log_failed,
3602                                     &binder_transaction_log_fops);
3603         }
3604         return ret;
3605 }
3606
3607 device_initcall(binder_init);
3608
3609 MODULE_LICENSE("GPL v2");