a97bbcd1c9ea3f9bbeead7dba687b804fdeef318
[linux-3.10.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 #include <linux/pid_namespace.h>
37
38 #include "binder.h"
39
40 static DEFINE_MUTEX(binder_lock);
41 static DEFINE_MUTEX(binder_deferred_lock);
42 static DEFINE_MUTEX(binder_mmap_lock);
43
44 static HLIST_HEAD(binder_procs);
45 static HLIST_HEAD(binder_deferred_list);
46 static HLIST_HEAD(binder_dead_nodes);
47
48 static struct dentry *binder_debugfs_dir_entry_root;
49 static struct dentry *binder_debugfs_dir_entry_proc;
50 static struct binder_node *binder_context_mgr_node;
51 static kuid_t binder_context_mgr_uid = INVALID_UID;
52 static int binder_last_id;
53 static struct workqueue_struct *binder_deferred_workqueue;
54
55 #define BINDER_DEBUG_ENTRY(name) \
56 static int binder_##name##_open(struct inode *inode, struct file *file) \
57 { \
58         return single_open(file, binder_##name##_show, inode->i_private); \
59 } \
60 \
61 static const struct file_operations binder_##name##_fops = { \
62         .owner = THIS_MODULE, \
63         .open = binder_##name##_open, \
64         .read = seq_read, \
65         .llseek = seq_lseek, \
66         .release = single_release, \
67 }
68
69 static int binder_proc_show(struct seq_file *m, void *unused);
70 BINDER_DEBUG_ENTRY(proc);
71
72 /* This is only defined in include/asm-arm/sizes.h */
73 #ifndef SZ_1K
74 #define SZ_1K                               0x400
75 #endif
76
77 #ifndef SZ_4M
78 #define SZ_4M                               0x400000
79 #endif
80
81 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
82
83 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
84
85 enum {
86         BINDER_DEBUG_USER_ERROR             = 1U << 0,
87         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
88         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
89         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
90         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
91         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
92         BINDER_DEBUG_READ_WRITE             = 1U << 6,
93         BINDER_DEBUG_USER_REFS              = 1U << 7,
94         BINDER_DEBUG_THREADS                = 1U << 8,
95         BINDER_DEBUG_TRANSACTION            = 1U << 9,
96         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
97         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
98         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
99         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
100         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
101         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
102 };
103 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
104         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
105 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
106
107 static bool binder_debug_no_lock;
108 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
109
110 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
111 static int binder_stop_on_user_error;
112
113 static int binder_set_stop_on_user_error(const char *val,
114                                          struct kernel_param *kp)
115 {
116         int ret;
117         ret = param_set_int(val, kp);
118         if (binder_stop_on_user_error < 2)
119                 wake_up(&binder_user_error_wait);
120         return ret;
121 }
122 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
123         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
124
125 #define binder_debug(mask, x...) \
126         do { \
127                 if (binder_debug_mask & mask) \
128                         pr_info(x); \
129         } while (0)
130
131 #define binder_user_error(x...) \
132         do { \
133                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
134                         pr_info(x); \
135                 if (binder_stop_on_user_error) \
136                         binder_stop_on_user_error = 2; \
137         } while (0)
138
139 enum binder_stat_types {
140         BINDER_STAT_PROC,
141         BINDER_STAT_THREAD,
142         BINDER_STAT_NODE,
143         BINDER_STAT_REF,
144         BINDER_STAT_DEATH,
145         BINDER_STAT_TRANSACTION,
146         BINDER_STAT_TRANSACTION_COMPLETE,
147         BINDER_STAT_COUNT
148 };
149
150 struct binder_stats {
151         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
152         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
153         int obj_created[BINDER_STAT_COUNT];
154         int obj_deleted[BINDER_STAT_COUNT];
155 };
156
157 static struct binder_stats binder_stats;
158
159 static inline void binder_stats_deleted(enum binder_stat_types type)
160 {
161         binder_stats.obj_deleted[type]++;
162 }
163
164 static inline void binder_stats_created(enum binder_stat_types type)
165 {
166         binder_stats.obj_created[type]++;
167 }
168
169 struct binder_transaction_log_entry {
170         int debug_id;
171         int call_type;
172         int from_proc;
173         int from_thread;
174         int target_handle;
175         int to_proc;
176         int to_thread;
177         int to_node;
178         int data_size;
179         int offsets_size;
180 };
181 struct binder_transaction_log {
182         int next;
183         int full;
184         struct binder_transaction_log_entry entry[32];
185 };
186 static struct binder_transaction_log binder_transaction_log;
187 static struct binder_transaction_log binder_transaction_log_failed;
188
189 static struct binder_transaction_log_entry *binder_transaction_log_add(
190         struct binder_transaction_log *log)
191 {
192         struct binder_transaction_log_entry *e;
193         e = &log->entry[log->next];
194         memset(e, 0, sizeof(*e));
195         log->next++;
196         if (log->next == ARRAY_SIZE(log->entry)) {
197                 log->next = 0;
198                 log->full = 1;
199         }
200         return e;
201 }
202
203 struct binder_work {
204         struct list_head entry;
205         enum {
206                 BINDER_WORK_TRANSACTION = 1,
207                 BINDER_WORK_TRANSACTION_COMPLETE,
208                 BINDER_WORK_NODE,
209                 BINDER_WORK_DEAD_BINDER,
210                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
211                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
212         } type;
213 };
214
215 struct binder_node {
216         int debug_id;
217         struct binder_work work;
218         union {
219                 struct rb_node rb_node;
220                 struct hlist_node dead_node;
221         };
222         struct binder_proc *proc;
223         struct hlist_head refs;
224         int internal_strong_refs;
225         int local_weak_refs;
226         int local_strong_refs;
227         void __user *ptr;
228         void __user *cookie;
229         unsigned has_strong_ref:1;
230         unsigned pending_strong_ref:1;
231         unsigned has_weak_ref:1;
232         unsigned pending_weak_ref:1;
233         unsigned has_async_transaction:1;
234         unsigned accept_fds:1;
235         unsigned min_priority:8;
236         struct list_head async_todo;
237 };
238
239 struct binder_ref_death {
240         struct binder_work work;
241         void __user *cookie;
242 };
243
244 struct binder_ref {
245         /* Lookups needed: */
246         /*   node + proc => ref (transaction) */
247         /*   desc + proc => ref (transaction, inc/dec ref) */
248         /*   node => refs + procs (proc exit) */
249         int debug_id;
250         struct rb_node rb_node_desc;
251         struct rb_node rb_node_node;
252         struct hlist_node node_entry;
253         struct binder_proc *proc;
254         struct binder_node *node;
255         uint32_t desc;
256         int strong;
257         int weak;
258         struct binder_ref_death *death;
259 };
260
261 struct binder_buffer {
262         struct list_head entry; /* free and allocated entries by address */
263         struct rb_node rb_node; /* free entry by size or allocated entry */
264                                 /* by address */
265         unsigned free:1;
266         unsigned allow_user_free:1;
267         unsigned async_transaction:1;
268         unsigned debug_id:29;
269
270         struct binder_transaction *transaction;
271
272         struct binder_node *target_node;
273         size_t data_size;
274         size_t offsets_size;
275         uint8_t data[0];
276 };
277
278 enum binder_deferred_state {
279         BINDER_DEFERRED_PUT_FILES    = 0x01,
280         BINDER_DEFERRED_FLUSH        = 0x02,
281         BINDER_DEFERRED_RELEASE      = 0x04,
282 };
283
284 struct binder_proc {
285         struct hlist_node proc_node;
286         struct rb_root threads;
287         struct rb_root nodes;
288         struct rb_root refs_by_desc;
289         struct rb_root refs_by_node;
290         int pid;
291         struct vm_area_struct *vma;
292         struct mm_struct *vma_vm_mm;
293         struct task_struct *tsk;
294         struct files_struct *files;
295         struct hlist_node deferred_work_node;
296         int deferred_work;
297         void *buffer;
298         ptrdiff_t user_buffer_offset;
299
300         struct list_head buffers;
301         struct rb_root free_buffers;
302         struct rb_root allocated_buffers;
303         size_t free_async_space;
304
305         struct page **pages;
306         size_t buffer_size;
307         uint32_t buffer_free;
308         struct list_head todo;
309         wait_queue_head_t wait;
310         struct binder_stats stats;
311         struct list_head delivered_death;
312         int max_threads;
313         int requested_threads;
314         int requested_threads_started;
315         int ready_threads;
316         long default_priority;
317         struct dentry *debugfs_entry;
318 };
319
320 enum {
321         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
322         BINDER_LOOPER_STATE_ENTERED     = 0x02,
323         BINDER_LOOPER_STATE_EXITED      = 0x04,
324         BINDER_LOOPER_STATE_INVALID     = 0x08,
325         BINDER_LOOPER_STATE_WAITING     = 0x10,
326         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
327 };
328
329 struct binder_thread {
330         struct binder_proc *proc;
331         struct rb_node rb_node;
332         int pid;
333         int looper;
334         struct binder_transaction *transaction_stack;
335         struct list_head todo;
336         uint32_t return_error; /* Write failed, return error code in read buf */
337         uint32_t return_error2; /* Write failed, return error code in read */
338                 /* buffer. Used when sending a reply to a dead process that */
339                 /* we are also waiting on */
340         wait_queue_head_t wait;
341         struct binder_stats stats;
342 };
343
344 struct binder_transaction {
345         int debug_id;
346         struct binder_work work;
347         struct binder_thread *from;
348         struct binder_transaction *from_parent;
349         struct binder_proc *to_proc;
350         struct binder_thread *to_thread;
351         struct binder_transaction *to_parent;
352         unsigned need_reply:1;
353         /* unsigned is_dead:1; */       /* not used at the moment */
354
355         struct binder_buffer *buffer;
356         unsigned int    code;
357         unsigned int    flags;
358         long    priority;
359         long    saved_priority;
360         kuid_t  sender_euid;
361 };
362
363 static void
364 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
365
366 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
367 {
368         struct files_struct *files = proc->files;
369         unsigned long rlim_cur;
370         unsigned long irqs;
371
372         if (files == NULL)
373                 return -ESRCH;
374
375         if (!lock_task_sighand(proc->tsk, &irqs))
376                 return -EMFILE;
377
378         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
379         unlock_task_sighand(proc->tsk, &irqs);
380
381         return __alloc_fd(files, 0, rlim_cur, flags);
382 }
383
384 /*
385  * copied from fd_install
386  */
387 static void task_fd_install(
388         struct binder_proc *proc, unsigned int fd, struct file *file)
389 {
390         if (proc->files)
391                 __fd_install(proc->files, fd, file);
392 }
393
394 /*
395  * copied from sys_close
396  */
397 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
398 {
399         int retval;
400
401         if (proc->files == NULL)
402                 return -ESRCH;
403
404         retval = __close_fd(proc->files, fd);
405         /* can't restart close syscall because file table entry was cleared */
406         if (unlikely(retval == -ERESTARTSYS ||
407                      retval == -ERESTARTNOINTR ||
408                      retval == -ERESTARTNOHAND ||
409                      retval == -ERESTART_RESTARTBLOCK))
410                 retval = -EINTR;
411
412         return retval;
413 }
414
415 static void binder_set_nice(long nice)
416 {
417         long min_nice;
418         if (can_nice(current, nice)) {
419                 set_user_nice(current, nice);
420                 return;
421         }
422         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
423         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
424                      "binder: %d: nice value %ld not allowed use "
425                      "%ld instead\n", current->pid, nice, min_nice);
426         set_user_nice(current, min_nice);
427         if (min_nice < 20)
428                 return;
429         binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
430 }
431
432 static size_t binder_buffer_size(struct binder_proc *proc,
433                                  struct binder_buffer *buffer)
434 {
435         if (list_is_last(&buffer->entry, &proc->buffers))
436                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
437         else
438                 return (size_t)list_entry(buffer->entry.next,
439                         struct binder_buffer, entry) - (size_t)buffer->data;
440 }
441
442 static void binder_insert_free_buffer(struct binder_proc *proc,
443                                       struct binder_buffer *new_buffer)
444 {
445         struct rb_node **p = &proc->free_buffers.rb_node;
446         struct rb_node *parent = NULL;
447         struct binder_buffer *buffer;
448         size_t buffer_size;
449         size_t new_buffer_size;
450
451         BUG_ON(!new_buffer->free);
452
453         new_buffer_size = binder_buffer_size(proc, new_buffer);
454
455         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
456                      "binder: %d: add free buffer, size %zd, "
457                      "at %p\n", proc->pid, new_buffer_size, new_buffer);
458
459         while (*p) {
460                 parent = *p;
461                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
462                 BUG_ON(!buffer->free);
463
464                 buffer_size = binder_buffer_size(proc, buffer);
465
466                 if (new_buffer_size < buffer_size)
467                         p = &parent->rb_left;
468                 else
469                         p = &parent->rb_right;
470         }
471         rb_link_node(&new_buffer->rb_node, parent, p);
472         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
473 }
474
475 static void binder_insert_allocated_buffer(struct binder_proc *proc,
476                                            struct binder_buffer *new_buffer)
477 {
478         struct rb_node **p = &proc->allocated_buffers.rb_node;
479         struct rb_node *parent = NULL;
480         struct binder_buffer *buffer;
481
482         BUG_ON(new_buffer->free);
483
484         while (*p) {
485                 parent = *p;
486                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
487                 BUG_ON(buffer->free);
488
489                 if (new_buffer < buffer)
490                         p = &parent->rb_left;
491                 else if (new_buffer > buffer)
492                         p = &parent->rb_right;
493                 else
494                         BUG();
495         }
496         rb_link_node(&new_buffer->rb_node, parent, p);
497         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
498 }
499
500 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
501                                                   void __user *user_ptr)
502 {
503         struct rb_node *n = proc->allocated_buffers.rb_node;
504         struct binder_buffer *buffer;
505         struct binder_buffer *kern_ptr;
506
507         kern_ptr = user_ptr - proc->user_buffer_offset
508                 - offsetof(struct binder_buffer, data);
509
510         while (n) {
511                 buffer = rb_entry(n, struct binder_buffer, rb_node);
512                 BUG_ON(buffer->free);
513
514                 if (kern_ptr < buffer)
515                         n = n->rb_left;
516                 else if (kern_ptr > buffer)
517                         n = n->rb_right;
518                 else
519                         return buffer;
520         }
521         return NULL;
522 }
523
524 static int binder_update_page_range(struct binder_proc *proc, int allocate,
525                                     void *start, void *end,
526                                     struct vm_area_struct *vma)
527 {
528         void *page_addr;
529         unsigned long user_page_addr;
530         struct vm_struct tmp_area;
531         struct page **page;
532         struct mm_struct *mm;
533
534         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
535                      "binder: %d: %s pages %p-%p\n", proc->pid,
536                      allocate ? "allocate" : "free", start, end);
537
538         if (end <= start)
539                 return 0;
540
541         if (vma)
542                 mm = NULL;
543         else
544                 mm = get_task_mm(proc->tsk);
545
546         if (mm) {
547                 down_write(&mm->mmap_sem);
548                 vma = proc->vma;
549                 if (vma && mm != proc->vma_vm_mm) {
550                         pr_err("binder: %d: vma mm and task mm mismatch\n",
551                                 proc->pid);
552                         vma = NULL;
553                 }
554         }
555
556         if (allocate == 0)
557                 goto free_range;
558
559         if (vma == NULL) {
560                 pr_err("binder: %d: binder_alloc_buf failed to "
561                        "map pages in userspace, no vma\n", proc->pid);
562                 goto err_no_vma;
563         }
564
565         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
566                 int ret;
567                 struct page **page_array_ptr;
568                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
569
570                 BUG_ON(*page);
571                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
572                 if (*page == NULL) {
573                         pr_err("binder: %d: binder_alloc_buf failed "
574                                "for page at %p\n", proc->pid, page_addr);
575                         goto err_alloc_page_failed;
576                 }
577                 tmp_area.addr = page_addr;
578                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
579                 page_array_ptr = page;
580                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
581                 if (ret) {
582                         pr_err("binder: %d: binder_alloc_buf failed "
583                                "to map page at %p in kernel\n",
584                                proc->pid, page_addr);
585                         goto err_map_kernel_failed;
586                 }
587                 user_page_addr =
588                         (uintptr_t)page_addr + proc->user_buffer_offset;
589                 ret = vm_insert_page(vma, user_page_addr, page[0]);
590                 if (ret) {
591                         pr_err("binder: %d: binder_alloc_buf failed "
592                                "to map page at %lx in userspace\n",
593                                proc->pid, user_page_addr);
594                         goto err_vm_insert_page_failed;
595                 }
596                 /* vm_insert_page does not seem to increment the refcount */
597         }
598         if (mm) {
599                 up_write(&mm->mmap_sem);
600                 mmput(mm);
601         }
602         return 0;
603
604 free_range:
605         for (page_addr = end - PAGE_SIZE; page_addr >= start;
606              page_addr -= PAGE_SIZE) {
607                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
608                 if (vma)
609                         zap_page_range(vma, (uintptr_t)page_addr +
610                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
611 err_vm_insert_page_failed:
612                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
613 err_map_kernel_failed:
614                 __free_page(*page);
615                 *page = NULL;
616 err_alloc_page_failed:
617                 ;
618         }
619 err_no_vma:
620         if (mm) {
621                 up_write(&mm->mmap_sem);
622                 mmput(mm);
623         }
624         return -ENOMEM;
625 }
626
627 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
628                                               size_t data_size,
629                                               size_t offsets_size, int is_async)
630 {
631         struct rb_node *n = proc->free_buffers.rb_node;
632         struct binder_buffer *buffer;
633         size_t buffer_size;
634         struct rb_node *best_fit = NULL;
635         void *has_page_addr;
636         void *end_page_addr;
637         size_t size;
638
639         if (proc->vma == NULL) {
640                 pr_err("binder: %d: binder_alloc_buf, no vma\n",
641                        proc->pid);
642                 return NULL;
643         }
644
645         size = ALIGN(data_size, sizeof(void *)) +
646                 ALIGN(offsets_size, sizeof(void *));
647
648         if (size < data_size || size < offsets_size) {
649                 binder_user_error("binder: %d: got transaction with invalid "
650                         "size %zd-%zd\n", proc->pid, data_size, offsets_size);
651                 return NULL;
652         }
653
654         if (is_async &&
655             proc->free_async_space < size + sizeof(struct binder_buffer)) {
656                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
657                              "binder: %d: binder_alloc_buf size %zd"
658                              "failed, no async space left\n", proc->pid, size);
659                 return NULL;
660         }
661
662         while (n) {
663                 buffer = rb_entry(n, struct binder_buffer, rb_node);
664                 BUG_ON(!buffer->free);
665                 buffer_size = binder_buffer_size(proc, buffer);
666
667                 if (size < buffer_size) {
668                         best_fit = n;
669                         n = n->rb_left;
670                 } else if (size > buffer_size)
671                         n = n->rb_right;
672                 else {
673                         best_fit = n;
674                         break;
675                 }
676         }
677         if (best_fit == NULL) {
678                 pr_err("binder: %d: binder_alloc_buf size %zd failed, "
679                        "no address space\n", proc->pid, size);
680                 return NULL;
681         }
682         if (n == NULL) {
683                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
684                 buffer_size = binder_buffer_size(proc, buffer);
685         }
686
687         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
688                      "binder: %d: binder_alloc_buf size %zd got buff"
689                      "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
690
691         has_page_addr =
692                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
693         if (n == NULL) {
694                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
695                         buffer_size = size; /* no room for other buffers */
696                 else
697                         buffer_size = size + sizeof(struct binder_buffer);
698         }
699         end_page_addr =
700                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
701         if (end_page_addr > has_page_addr)
702                 end_page_addr = has_page_addr;
703         if (binder_update_page_range(proc, 1,
704             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
705                 return NULL;
706
707         rb_erase(best_fit, &proc->free_buffers);
708         buffer->free = 0;
709         binder_insert_allocated_buffer(proc, buffer);
710         if (buffer_size != size) {
711                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
712                 list_add(&new_buffer->entry, &buffer->entry);
713                 new_buffer->free = 1;
714                 binder_insert_free_buffer(proc, new_buffer);
715         }
716         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
717                      "binder: %d: binder_alloc_buf size %zd got "
718                      "%p\n", proc->pid, size, buffer);
719         buffer->data_size = data_size;
720         buffer->offsets_size = offsets_size;
721         buffer->async_transaction = is_async;
722         if (is_async) {
723                 proc->free_async_space -= size + sizeof(struct binder_buffer);
724                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
725                              "binder: %d: binder_alloc_buf size %zd "
726                              "async free %zd\n", proc->pid, size,
727                              proc->free_async_space);
728         }
729
730         return buffer;
731 }
732
733 static void *buffer_start_page(struct binder_buffer *buffer)
734 {
735         return (void *)((uintptr_t)buffer & PAGE_MASK);
736 }
737
738 static void *buffer_end_page(struct binder_buffer *buffer)
739 {
740         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
741 }
742
743 static void binder_delete_free_buffer(struct binder_proc *proc,
744                                       struct binder_buffer *buffer)
745 {
746         struct binder_buffer *prev, *next = NULL;
747         int free_page_end = 1;
748         int free_page_start = 1;
749
750         BUG_ON(proc->buffers.next == &buffer->entry);
751         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
752         BUG_ON(!prev->free);
753         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
754                 free_page_start = 0;
755                 if (buffer_end_page(prev) == buffer_end_page(buffer))
756                         free_page_end = 0;
757                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
758                              "binder: %d: merge free, buffer %p "
759                              "share page with %p\n", proc->pid, buffer, prev);
760         }
761
762         if (!list_is_last(&buffer->entry, &proc->buffers)) {
763                 next = list_entry(buffer->entry.next,
764                                   struct binder_buffer, entry);
765                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
766                         free_page_end = 0;
767                         if (buffer_start_page(next) ==
768                             buffer_start_page(buffer))
769                                 free_page_start = 0;
770                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
771                                      "binder: %d: merge free, buffer"
772                                      " %p share page with %p\n", proc->pid,
773                                      buffer, prev);
774                 }
775         }
776         list_del(&buffer->entry);
777         if (free_page_start || free_page_end) {
778                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
779                              "binder: %d: merge free, buffer %p do "
780                              "not share page%s%s with with %p or %p\n",
781                              proc->pid, buffer, free_page_start ? "" : " end",
782                              free_page_end ? "" : " start", prev, next);
783                 binder_update_page_range(proc, 0, free_page_start ?
784                         buffer_start_page(buffer) : buffer_end_page(buffer),
785                         (free_page_end ? buffer_end_page(buffer) :
786                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
787         }
788 }
789
790 static void binder_free_buf(struct binder_proc *proc,
791                             struct binder_buffer *buffer)
792 {
793         size_t size, buffer_size;
794
795         buffer_size = binder_buffer_size(proc, buffer);
796
797         size = ALIGN(buffer->data_size, sizeof(void *)) +
798                 ALIGN(buffer->offsets_size, sizeof(void *));
799
800         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
801                      "binder: %d: binder_free_buf %p size %zd buffer"
802                      "_size %zd\n", proc->pid, buffer, size, buffer_size);
803
804         BUG_ON(buffer->free);
805         BUG_ON(size > buffer_size);
806         BUG_ON(buffer->transaction != NULL);
807         BUG_ON((void *)buffer < proc->buffer);
808         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
809
810         if (buffer->async_transaction) {
811                 proc->free_async_space += size + sizeof(struct binder_buffer);
812
813                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
814                              "binder: %d: binder_free_buf size %zd "
815                              "async free %zd\n", proc->pid, size,
816                              proc->free_async_space);
817         }
818
819         binder_update_page_range(proc, 0,
820                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
821                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
822                 NULL);
823         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
824         buffer->free = 1;
825         if (!list_is_last(&buffer->entry, &proc->buffers)) {
826                 struct binder_buffer *next = list_entry(buffer->entry.next,
827                                                 struct binder_buffer, entry);
828                 if (next->free) {
829                         rb_erase(&next->rb_node, &proc->free_buffers);
830                         binder_delete_free_buffer(proc, next);
831                 }
832         }
833         if (proc->buffers.next != &buffer->entry) {
834                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
835                                                 struct binder_buffer, entry);
836                 if (prev->free) {
837                         binder_delete_free_buffer(proc, buffer);
838                         rb_erase(&prev->rb_node, &proc->free_buffers);
839                         buffer = prev;
840                 }
841         }
842         binder_insert_free_buffer(proc, buffer);
843 }
844
845 static struct binder_node *binder_get_node(struct binder_proc *proc,
846                                            void __user *ptr)
847 {
848         struct rb_node *n = proc->nodes.rb_node;
849         struct binder_node *node;
850
851         while (n) {
852                 node = rb_entry(n, struct binder_node, rb_node);
853
854                 if (ptr < node->ptr)
855                         n = n->rb_left;
856                 else if (ptr > node->ptr)
857                         n = n->rb_right;
858                 else
859                         return node;
860         }
861         return NULL;
862 }
863
864 static struct binder_node *binder_new_node(struct binder_proc *proc,
865                                            void __user *ptr,
866                                            void __user *cookie)
867 {
868         struct rb_node **p = &proc->nodes.rb_node;
869         struct rb_node *parent = NULL;
870         struct binder_node *node;
871
872         while (*p) {
873                 parent = *p;
874                 node = rb_entry(parent, struct binder_node, rb_node);
875
876                 if (ptr < node->ptr)
877                         p = &(*p)->rb_left;
878                 else if (ptr > node->ptr)
879                         p = &(*p)->rb_right;
880                 else
881                         return NULL;
882         }
883
884         node = kzalloc(sizeof(*node), GFP_KERNEL);
885         if (node == NULL)
886                 return NULL;
887         binder_stats_created(BINDER_STAT_NODE);
888         rb_link_node(&node->rb_node, parent, p);
889         rb_insert_color(&node->rb_node, &proc->nodes);
890         node->debug_id = ++binder_last_id;
891         node->proc = proc;
892         node->ptr = ptr;
893         node->cookie = cookie;
894         node->work.type = BINDER_WORK_NODE;
895         INIT_LIST_HEAD(&node->work.entry);
896         INIT_LIST_HEAD(&node->async_todo);
897         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
898                      "binder: %d:%d node %d u%p c%p created\n",
899                      proc->pid, current->pid, node->debug_id,
900                      node->ptr, node->cookie);
901         return node;
902 }
903
904 static int binder_inc_node(struct binder_node *node, int strong, int internal,
905                            struct list_head *target_list)
906 {
907         if (strong) {
908                 if (internal) {
909                         if (target_list == NULL &&
910                             node->internal_strong_refs == 0 &&
911                             !(node == binder_context_mgr_node &&
912                             node->has_strong_ref)) {
913                                 pr_err("binder: invalid inc strong "
914                                         "node for %d\n", node->debug_id);
915                                 return -EINVAL;
916                         }
917                         node->internal_strong_refs++;
918                 } else
919                         node->local_strong_refs++;
920                 if (!node->has_strong_ref && target_list) {
921                         list_del_init(&node->work.entry);
922                         list_add_tail(&node->work.entry, target_list);
923                 }
924         } else {
925                 if (!internal)
926                         node->local_weak_refs++;
927                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
928                         if (target_list == NULL) {
929                                 pr_err("binder: invalid inc weak node "
930                                         "for %d\n", node->debug_id);
931                                 return -EINVAL;
932                         }
933                         list_add_tail(&node->work.entry, target_list);
934                 }
935         }
936         return 0;
937 }
938
939 static int binder_dec_node(struct binder_node *node, int strong, int internal)
940 {
941         if (strong) {
942                 if (internal)
943                         node->internal_strong_refs--;
944                 else
945                         node->local_strong_refs--;
946                 if (node->local_strong_refs || node->internal_strong_refs)
947                         return 0;
948         } else {
949                 if (!internal)
950                         node->local_weak_refs--;
951                 if (node->local_weak_refs || !hlist_empty(&node->refs))
952                         return 0;
953         }
954         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
955                 if (list_empty(&node->work.entry)) {
956                         list_add_tail(&node->work.entry, &node->proc->todo);
957                         wake_up_interruptible(&node->proc->wait);
958                 }
959         } else {
960                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
961                     !node->local_weak_refs) {
962                         list_del_init(&node->work.entry);
963                         if (node->proc) {
964                                 rb_erase(&node->rb_node, &node->proc->nodes);
965                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
966                                              "binder: refless node %d deleted\n",
967                                              node->debug_id);
968                         } else {
969                                 hlist_del(&node->dead_node);
970                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
971                                              "binder: dead node %d deleted\n",
972                                              node->debug_id);
973                         }
974                         kfree(node);
975                         binder_stats_deleted(BINDER_STAT_NODE);
976                 }
977         }
978
979         return 0;
980 }
981
982
983 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
984                                          uint32_t desc)
985 {
986         struct rb_node *n = proc->refs_by_desc.rb_node;
987         struct binder_ref *ref;
988
989         while (n) {
990                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
991
992                 if (desc < ref->desc)
993                         n = n->rb_left;
994                 else if (desc > ref->desc)
995                         n = n->rb_right;
996                 else
997                         return ref;
998         }
999         return NULL;
1000 }
1001
1002 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1003                                                   struct binder_node *node)
1004 {
1005         struct rb_node *n;
1006         struct rb_node **p = &proc->refs_by_node.rb_node;
1007         struct rb_node *parent = NULL;
1008         struct binder_ref *ref, *new_ref;
1009
1010         while (*p) {
1011                 parent = *p;
1012                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1013
1014                 if (node < ref->node)
1015                         p = &(*p)->rb_left;
1016                 else if (node > ref->node)
1017                         p = &(*p)->rb_right;
1018                 else
1019                         return ref;
1020         }
1021         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1022         if (new_ref == NULL)
1023                 return NULL;
1024         binder_stats_created(BINDER_STAT_REF);
1025         new_ref->debug_id = ++binder_last_id;
1026         new_ref->proc = proc;
1027         new_ref->node = node;
1028         rb_link_node(&new_ref->rb_node_node, parent, p);
1029         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1030
1031         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1032         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1033                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1034                 if (ref->desc > new_ref->desc)
1035                         break;
1036                 new_ref->desc = ref->desc + 1;
1037         }
1038
1039         p = &proc->refs_by_desc.rb_node;
1040         while (*p) {
1041                 parent = *p;
1042                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1043
1044                 if (new_ref->desc < ref->desc)
1045                         p = &(*p)->rb_left;
1046                 else if (new_ref->desc > ref->desc)
1047                         p = &(*p)->rb_right;
1048                 else
1049                         BUG();
1050         }
1051         rb_link_node(&new_ref->rb_node_desc, parent, p);
1052         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1053         if (node) {
1054                 hlist_add_head(&new_ref->node_entry, &node->refs);
1055
1056                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1057                              "binder: %d new ref %d desc %d for "
1058                              "node %d\n", proc->pid, new_ref->debug_id,
1059                              new_ref->desc, node->debug_id);
1060         } else {
1061                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1062                              "binder: %d new ref %d desc %d for "
1063                              "dead node\n", proc->pid, new_ref->debug_id,
1064                               new_ref->desc);
1065         }
1066         return new_ref;
1067 }
1068
1069 static void binder_delete_ref(struct binder_ref *ref)
1070 {
1071         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1072                      "binder: %d delete ref %d desc %d for "
1073                      "node %d\n", ref->proc->pid, ref->debug_id,
1074                      ref->desc, ref->node->debug_id);
1075
1076         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1077         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1078         if (ref->strong)
1079                 binder_dec_node(ref->node, 1, 1);
1080         hlist_del(&ref->node_entry);
1081         binder_dec_node(ref->node, 0, 1);
1082         if (ref->death) {
1083                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1084                              "binder: %d delete ref %d desc %d "
1085                              "has death notification\n", ref->proc->pid,
1086                              ref->debug_id, ref->desc);
1087                 list_del(&ref->death->work.entry);
1088                 kfree(ref->death);
1089                 binder_stats_deleted(BINDER_STAT_DEATH);
1090         }
1091         kfree(ref);
1092         binder_stats_deleted(BINDER_STAT_REF);
1093 }
1094
1095 static int binder_inc_ref(struct binder_ref *ref, int strong,
1096                           struct list_head *target_list)
1097 {
1098         int ret;
1099         if (strong) {
1100                 if (ref->strong == 0) {
1101                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1102                         if (ret)
1103                                 return ret;
1104                 }
1105                 ref->strong++;
1106         } else {
1107                 if (ref->weak == 0) {
1108                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1109                         if (ret)
1110                                 return ret;
1111                 }
1112                 ref->weak++;
1113         }
1114         return 0;
1115 }
1116
1117
1118 static int binder_dec_ref(struct binder_ref *ref, int strong)
1119 {
1120         if (strong) {
1121                 if (ref->strong == 0) {
1122                         binder_user_error("binder: %d invalid dec strong, "
1123                                           "ref %d desc %d s %d w %d\n",
1124                                           ref->proc->pid, ref->debug_id,
1125                                           ref->desc, ref->strong, ref->weak);
1126                         return -EINVAL;
1127                 }
1128                 ref->strong--;
1129                 if (ref->strong == 0) {
1130                         int ret;
1131                         ret = binder_dec_node(ref->node, strong, 1);
1132                         if (ret)
1133                                 return ret;
1134                 }
1135         } else {
1136                 if (ref->weak == 0) {
1137                         binder_user_error("binder: %d invalid dec weak, "
1138                                           "ref %d desc %d s %d w %d\n",
1139                                           ref->proc->pid, ref->debug_id,
1140                                           ref->desc, ref->strong, ref->weak);
1141                         return -EINVAL;
1142                 }
1143                 ref->weak--;
1144         }
1145         if (ref->strong == 0 && ref->weak == 0)
1146                 binder_delete_ref(ref);
1147         return 0;
1148 }
1149
1150 static void binder_pop_transaction(struct binder_thread *target_thread,
1151                                    struct binder_transaction *t)
1152 {
1153         if (target_thread) {
1154                 BUG_ON(target_thread->transaction_stack != t);
1155                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1156                 target_thread->transaction_stack =
1157                         target_thread->transaction_stack->from_parent;
1158                 t->from = NULL;
1159         }
1160         t->need_reply = 0;
1161         if (t->buffer)
1162                 t->buffer->transaction = NULL;
1163         kfree(t);
1164         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1165 }
1166
1167 static void binder_send_failed_reply(struct binder_transaction *t,
1168                                      uint32_t error_code)
1169 {
1170         struct binder_thread *target_thread;
1171         BUG_ON(t->flags & TF_ONE_WAY);
1172         while (1) {
1173                 target_thread = t->from;
1174                 if (target_thread) {
1175                         if (target_thread->return_error != BR_OK &&
1176                            target_thread->return_error2 == BR_OK) {
1177                                 target_thread->return_error2 =
1178                                         target_thread->return_error;
1179                                 target_thread->return_error = BR_OK;
1180                         }
1181                         if (target_thread->return_error == BR_OK) {
1182                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1183                                              "binder: send failed reply for "
1184                                              "transaction %d to %d:%d\n",
1185                                               t->debug_id, target_thread->proc->pid,
1186                                               target_thread->pid);
1187
1188                                 binder_pop_transaction(target_thread, t);
1189                                 target_thread->return_error = error_code;
1190                                 wake_up_interruptible(&target_thread->wait);
1191                         } else {
1192                                 pr_err("binder: reply failed, target "
1193                                         "thread, %d:%d, has error code %d "
1194                                         "already\n", target_thread->proc->pid,
1195                                         target_thread->pid,
1196                                         target_thread->return_error);
1197                         }
1198                         return;
1199                 } else {
1200                         struct binder_transaction *next = t->from_parent;
1201
1202                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1203                                      "binder: send failed reply "
1204                                      "for transaction %d, target dead\n",
1205                                      t->debug_id);
1206
1207                         binder_pop_transaction(target_thread, t);
1208                         if (next == NULL) {
1209                                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1210                                              "binder: reply failed,"
1211                                              " no target thread at root\n");
1212                                 return;
1213                         }
1214                         t = next;
1215                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1216                                      "binder: reply failed, no target "
1217                                      "thread -- retry %d\n", t->debug_id);
1218                 }
1219         }
1220 }
1221
1222 static void binder_transaction_buffer_release(struct binder_proc *proc,
1223                                               struct binder_buffer *buffer,
1224                                               size_t *failed_at)
1225 {
1226         size_t *offp, *off_end;
1227         int debug_id = buffer->debug_id;
1228
1229         binder_debug(BINDER_DEBUG_TRANSACTION,
1230                      "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1231                      proc->pid, buffer->debug_id,
1232                      buffer->data_size, buffer->offsets_size, failed_at);
1233
1234         if (buffer->target_node)
1235                 binder_dec_node(buffer->target_node, 1, 0);
1236
1237         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1238         if (failed_at)
1239                 off_end = failed_at;
1240         else
1241                 off_end = (void *)offp + buffer->offsets_size;
1242         for (; offp < off_end; offp++) {
1243                 struct flat_binder_object *fp;
1244                 if (*offp > buffer->data_size - sizeof(*fp) ||
1245                     buffer->data_size < sizeof(*fp) ||
1246                     !IS_ALIGNED(*offp, sizeof(void *))) {
1247                         pr_err("binder: transaction release %d bad"
1248                                         "offset %zd, size %zd\n", debug_id,
1249                                         *offp, buffer->data_size);
1250                         continue;
1251                 }
1252                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1253                 switch (fp->type) {
1254                 case BINDER_TYPE_BINDER:
1255                 case BINDER_TYPE_WEAK_BINDER: {
1256                         struct binder_node *node = binder_get_node(proc, fp->binder);
1257                         if (node == NULL) {
1258                                 pr_err("binder: transaction release %d"
1259                                        " bad node %p\n", debug_id, fp->binder);
1260                                 break;
1261                         }
1262                         binder_debug(BINDER_DEBUG_TRANSACTION,
1263                                      "        node %d u%p\n",
1264                                      node->debug_id, node->ptr);
1265                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1266                 } break;
1267                 case BINDER_TYPE_HANDLE:
1268                 case BINDER_TYPE_WEAK_HANDLE: {
1269                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1270                         if (ref == NULL) {
1271                                 pr_err("binder: transaction release %d"
1272                                        " bad handle %ld\n", debug_id,
1273                                        fp->handle);
1274                                 break;
1275                         }
1276                         binder_debug(BINDER_DEBUG_TRANSACTION,
1277                                      "        ref %d desc %d (node %d)\n",
1278                                      ref->debug_id, ref->desc, ref->node->debug_id);
1279                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1280                 } break;
1281
1282                 case BINDER_TYPE_FD:
1283                         binder_debug(BINDER_DEBUG_TRANSACTION,
1284                                      "        fd %ld\n", fp->handle);
1285                         if (failed_at)
1286                                 task_close_fd(proc, fp->handle);
1287                         break;
1288
1289                 default:
1290                         pr_err("binder: transaction release %d bad "
1291                                "object type %lx\n", debug_id, fp->type);
1292                         break;
1293                 }
1294         }
1295 }
1296
1297 static void binder_transaction(struct binder_proc *proc,
1298                                struct binder_thread *thread,
1299                                struct binder_transaction_data *tr, int reply)
1300 {
1301         struct binder_transaction *t;
1302         struct binder_work *tcomplete;
1303         size_t *offp, *off_end;
1304         struct binder_proc *target_proc;
1305         struct binder_thread *target_thread = NULL;
1306         struct binder_node *target_node = NULL;
1307         struct list_head *target_list;
1308         wait_queue_head_t *target_wait;
1309         struct binder_transaction *in_reply_to = NULL;
1310         struct binder_transaction_log_entry *e;
1311         uint32_t return_error;
1312
1313         e = binder_transaction_log_add(&binder_transaction_log);
1314         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1315         e->from_proc = proc->pid;
1316         e->from_thread = thread->pid;
1317         e->target_handle = tr->target.handle;
1318         e->data_size = tr->data_size;
1319         e->offsets_size = tr->offsets_size;
1320
1321         if (reply) {
1322                 in_reply_to = thread->transaction_stack;
1323                 if (in_reply_to == NULL) {
1324                         binder_user_error("binder: %d:%d got reply transaction "
1325                                           "with no transaction stack\n",
1326                                           proc->pid, thread->pid);
1327                         return_error = BR_FAILED_REPLY;
1328                         goto err_empty_call_stack;
1329                 }
1330                 binder_set_nice(in_reply_to->saved_priority);
1331                 if (in_reply_to->to_thread != thread) {
1332                         binder_user_error("binder: %d:%d got reply transaction "
1333                                 "with bad transaction stack,"
1334                                 " transaction %d has target %d:%d\n",
1335                                 proc->pid, thread->pid, in_reply_to->debug_id,
1336                                 in_reply_to->to_proc ?
1337                                 in_reply_to->to_proc->pid : 0,
1338                                 in_reply_to->to_thread ?
1339                                 in_reply_to->to_thread->pid : 0);
1340                         return_error = BR_FAILED_REPLY;
1341                         in_reply_to = NULL;
1342                         goto err_bad_call_stack;
1343                 }
1344                 thread->transaction_stack = in_reply_to->to_parent;
1345                 target_thread = in_reply_to->from;
1346                 if (target_thread == NULL) {
1347                         return_error = BR_DEAD_REPLY;
1348                         goto err_dead_binder;
1349                 }
1350                 if (target_thread->transaction_stack != in_reply_to) {
1351                         binder_user_error("binder: %d:%d got reply transaction "
1352                                 "with bad target transaction stack %d, "
1353                                 "expected %d\n",
1354                                 proc->pid, thread->pid,
1355                                 target_thread->transaction_stack ?
1356                                 target_thread->transaction_stack->debug_id : 0,
1357                                 in_reply_to->debug_id);
1358                         return_error = BR_FAILED_REPLY;
1359                         in_reply_to = NULL;
1360                         target_thread = NULL;
1361                         goto err_dead_binder;
1362                 }
1363                 target_proc = target_thread->proc;
1364         } else {
1365                 if (tr->target.handle) {
1366                         struct binder_ref *ref;
1367                         ref = binder_get_ref(proc, tr->target.handle);
1368                         if (ref == NULL) {
1369                                 binder_user_error("binder: %d:%d got "
1370                                         "transaction to invalid handle\n",
1371                                         proc->pid, thread->pid);
1372                                 return_error = BR_FAILED_REPLY;
1373                                 goto err_invalid_target_handle;
1374                         }
1375                         target_node = ref->node;
1376                 } else {
1377                         target_node = binder_context_mgr_node;
1378                         if (target_node == NULL) {
1379                                 return_error = BR_DEAD_REPLY;
1380                                 goto err_no_context_mgr_node;
1381                         }
1382                 }
1383                 e->to_node = target_node->debug_id;
1384                 target_proc = target_node->proc;
1385                 if (target_proc == NULL) {
1386                         return_error = BR_DEAD_REPLY;
1387                         goto err_dead_binder;
1388                 }
1389                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1390                         struct binder_transaction *tmp;
1391                         tmp = thread->transaction_stack;
1392                         if (tmp->to_thread != thread) {
1393                                 binder_user_error("binder: %d:%d got new "
1394                                         "transaction with bad transaction stack"
1395                                         ", transaction %d has target %d:%d\n",
1396                                         proc->pid, thread->pid, tmp->debug_id,
1397                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1398                                         tmp->to_thread ?
1399                                         tmp->to_thread->pid : 0);
1400                                 return_error = BR_FAILED_REPLY;
1401                                 goto err_bad_call_stack;
1402                         }
1403                         while (tmp) {
1404                                 if (tmp->from && tmp->from->proc == target_proc)
1405                                         target_thread = tmp->from;
1406                                 tmp = tmp->from_parent;
1407                         }
1408                 }
1409         }
1410         if (target_thread) {
1411                 e->to_thread = target_thread->pid;
1412                 target_list = &target_thread->todo;
1413                 target_wait = &target_thread->wait;
1414         } else {
1415                 target_list = &target_proc->todo;
1416                 target_wait = &target_proc->wait;
1417         }
1418         e->to_proc = target_proc->pid;
1419
1420         /* TODO: reuse incoming transaction for reply */
1421         t = kzalloc(sizeof(*t), GFP_KERNEL);
1422         if (t == NULL) {
1423                 return_error = BR_FAILED_REPLY;
1424                 goto err_alloc_t_failed;
1425         }
1426         binder_stats_created(BINDER_STAT_TRANSACTION);
1427
1428         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1429         if (tcomplete == NULL) {
1430                 return_error = BR_FAILED_REPLY;
1431                 goto err_alloc_tcomplete_failed;
1432         }
1433         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1434
1435         t->debug_id = ++binder_last_id;
1436         e->debug_id = t->debug_id;
1437
1438         if (reply)
1439                 binder_debug(BINDER_DEBUG_TRANSACTION,
1440                              "binder: %d:%d BC_REPLY %d -> %d:%d, "
1441                              "data %p-%p size %zd-%zd\n",
1442                              proc->pid, thread->pid, t->debug_id,
1443                              target_proc->pid, target_thread->pid,
1444                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1445                              tr->data_size, tr->offsets_size);
1446         else
1447                 binder_debug(BINDER_DEBUG_TRANSACTION,
1448                              "binder: %d:%d BC_TRANSACTION %d -> "
1449                              "%d - node %d, data %p-%p size %zd-%zd\n",
1450                              proc->pid, thread->pid, t->debug_id,
1451                              target_proc->pid, target_node->debug_id,
1452                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1453                              tr->data_size, tr->offsets_size);
1454
1455         if (!reply && !(tr->flags & TF_ONE_WAY))
1456                 t->from = thread;
1457         else
1458                 t->from = NULL;
1459         t->sender_euid = proc->tsk->cred->euid;
1460         t->to_proc = target_proc;
1461         t->to_thread = target_thread;
1462         t->code = tr->code;
1463         t->flags = tr->flags;
1464         t->priority = task_nice(current);
1465         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1466                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1467         if (t->buffer == NULL) {
1468                 return_error = BR_FAILED_REPLY;
1469                 goto err_binder_alloc_buf_failed;
1470         }
1471         t->buffer->allow_user_free = 0;
1472         t->buffer->debug_id = t->debug_id;
1473         t->buffer->transaction = t;
1474         t->buffer->target_node = target_node;
1475         if (target_node)
1476                 binder_inc_node(target_node, 1, 0, NULL);
1477
1478         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1479
1480         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1481                 binder_user_error("binder: %d:%d got transaction with invalid "
1482                         "data ptr\n", proc->pid, thread->pid);
1483                 return_error = BR_FAILED_REPLY;
1484                 goto err_copy_data_failed;
1485         }
1486         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1487                 binder_user_error("binder: %d:%d got transaction with invalid "
1488                         "offsets ptr\n", proc->pid, thread->pid);
1489                 return_error = BR_FAILED_REPLY;
1490                 goto err_copy_data_failed;
1491         }
1492         if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1493                 binder_user_error("binder: %d:%d got transaction with "
1494                         "invalid offsets size, %zd\n",
1495                         proc->pid, thread->pid, tr->offsets_size);
1496                 return_error = BR_FAILED_REPLY;
1497                 goto err_bad_offset;
1498         }
1499         off_end = (void *)offp + tr->offsets_size;
1500         for (; offp < off_end; offp++) {
1501                 struct flat_binder_object *fp;
1502                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1503                     t->buffer->data_size < sizeof(*fp) ||
1504                     !IS_ALIGNED(*offp, sizeof(void *))) {
1505                         binder_user_error("binder: %d:%d got transaction with "
1506                                 "invalid offset, %zd\n",
1507                                 proc->pid, thread->pid, *offp);
1508                         return_error = BR_FAILED_REPLY;
1509                         goto err_bad_offset;
1510                 }
1511                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1512                 switch (fp->type) {
1513                 case BINDER_TYPE_BINDER:
1514                 case BINDER_TYPE_WEAK_BINDER: {
1515                         struct binder_ref *ref;
1516                         struct binder_node *node = binder_get_node(proc, fp->binder);
1517                         if (node == NULL) {
1518                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1519                                 if (node == NULL) {
1520                                         return_error = BR_FAILED_REPLY;
1521                                         goto err_binder_new_node_failed;
1522                                 }
1523                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1524                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1525                         }
1526                         if (fp->cookie != node->cookie) {
1527                                 binder_user_error("binder: %d:%d sending u%p "
1528                                         "node %d, cookie mismatch %p != %p\n",
1529                                         proc->pid, thread->pid,
1530                                         fp->binder, node->debug_id,
1531                                         fp->cookie, node->cookie);
1532                                 goto err_binder_get_ref_for_node_failed;
1533                         }
1534                         ref = binder_get_ref_for_node(target_proc, node);
1535                         if (ref == NULL) {
1536                                 return_error = BR_FAILED_REPLY;
1537                                 goto err_binder_get_ref_for_node_failed;
1538                         }
1539                         if (fp->type == BINDER_TYPE_BINDER)
1540                                 fp->type = BINDER_TYPE_HANDLE;
1541                         else
1542                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1543                         fp->handle = ref->desc;
1544                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1545                                        &thread->todo);
1546
1547                         binder_debug(BINDER_DEBUG_TRANSACTION,
1548                                      "        node %d u%p -> ref %d desc %d\n",
1549                                      node->debug_id, node->ptr, ref->debug_id,
1550                                      ref->desc);
1551                 } break;
1552                 case BINDER_TYPE_HANDLE:
1553                 case BINDER_TYPE_WEAK_HANDLE: {
1554                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1555                         if (ref == NULL) {
1556                                 binder_user_error("binder: %d:%d got "
1557                                         "transaction with invalid "
1558                                         "handle, %ld\n", proc->pid,
1559                                         thread->pid, fp->handle);
1560                                 return_error = BR_FAILED_REPLY;
1561                                 goto err_binder_get_ref_failed;
1562                         }
1563                         if (ref->node->proc == target_proc) {
1564                                 if (fp->type == BINDER_TYPE_HANDLE)
1565                                         fp->type = BINDER_TYPE_BINDER;
1566                                 else
1567                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1568                                 fp->binder = ref->node->ptr;
1569                                 fp->cookie = ref->node->cookie;
1570                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1571                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1572                                              "        ref %d desc %d -> node %d u%p\n",
1573                                              ref->debug_id, ref->desc, ref->node->debug_id,
1574                                              ref->node->ptr);
1575                         } else {
1576                                 struct binder_ref *new_ref;
1577                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1578                                 if (new_ref == NULL) {
1579                                         return_error = BR_FAILED_REPLY;
1580                                         goto err_binder_get_ref_for_node_failed;
1581                                 }
1582                                 fp->handle = new_ref->desc;
1583                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1584                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1585                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1586                                              ref->debug_id, ref->desc, new_ref->debug_id,
1587                                              new_ref->desc, ref->node->debug_id);
1588                         }
1589                 } break;
1590
1591                 case BINDER_TYPE_FD: {
1592                         int target_fd;
1593                         struct file *file;
1594
1595                         if (reply) {
1596                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1597                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1598                                                 proc->pid, thread->pid, fp->handle);
1599                                         return_error = BR_FAILED_REPLY;
1600                                         goto err_fd_not_allowed;
1601                                 }
1602                         } else if (!target_node->accept_fds) {
1603                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1604                                         proc->pid, thread->pid, fp->handle);
1605                                 return_error = BR_FAILED_REPLY;
1606                                 goto err_fd_not_allowed;
1607                         }
1608
1609                         file = fget(fp->handle);
1610                         if (file == NULL) {
1611                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1612                                         proc->pid, thread->pid, fp->handle);
1613                                 return_error = BR_FAILED_REPLY;
1614                                 goto err_fget_failed;
1615                         }
1616                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1617                         if (target_fd < 0) {
1618                                 fput(file);
1619                                 return_error = BR_FAILED_REPLY;
1620                                 goto err_get_unused_fd_failed;
1621                         }
1622                         task_fd_install(target_proc, target_fd, file);
1623                         binder_debug(BINDER_DEBUG_TRANSACTION,
1624                                      "        fd %ld -> %d\n", fp->handle, target_fd);
1625                         /* TODO: fput? */
1626                         fp->handle = target_fd;
1627                 } break;
1628
1629                 default:
1630                         binder_user_error("binder: %d:%d got transactio"
1631                                 "n with invalid object type, %lx\n",
1632                                 proc->pid, thread->pid, fp->type);
1633                         return_error = BR_FAILED_REPLY;
1634                         goto err_bad_object_type;
1635                 }
1636         }
1637         if (reply) {
1638                 BUG_ON(t->buffer->async_transaction != 0);
1639                 binder_pop_transaction(target_thread, in_reply_to);
1640         } else if (!(t->flags & TF_ONE_WAY)) {
1641                 BUG_ON(t->buffer->async_transaction != 0);
1642                 t->need_reply = 1;
1643                 t->from_parent = thread->transaction_stack;
1644                 thread->transaction_stack = t;
1645         } else {
1646                 BUG_ON(target_node == NULL);
1647                 BUG_ON(t->buffer->async_transaction != 1);
1648                 if (target_node->has_async_transaction) {
1649                         target_list = &target_node->async_todo;
1650                         target_wait = NULL;
1651                 } else
1652                         target_node->has_async_transaction = 1;
1653         }
1654         t->work.type = BINDER_WORK_TRANSACTION;
1655         list_add_tail(&t->work.entry, target_list);
1656         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1657         list_add_tail(&tcomplete->entry, &thread->todo);
1658         if (target_wait)
1659                 wake_up_interruptible(target_wait);
1660         return;
1661
1662 err_get_unused_fd_failed:
1663 err_fget_failed:
1664 err_fd_not_allowed:
1665 err_binder_get_ref_for_node_failed:
1666 err_binder_get_ref_failed:
1667 err_binder_new_node_failed:
1668 err_bad_object_type:
1669 err_bad_offset:
1670 err_copy_data_failed:
1671         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1672         t->buffer->transaction = NULL;
1673         binder_free_buf(target_proc, t->buffer);
1674 err_binder_alloc_buf_failed:
1675         kfree(tcomplete);
1676         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1677 err_alloc_tcomplete_failed:
1678         kfree(t);
1679         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1680 err_alloc_t_failed:
1681 err_bad_call_stack:
1682 err_empty_call_stack:
1683 err_dead_binder:
1684 err_invalid_target_handle:
1685 err_no_context_mgr_node:
1686         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1687                      "binder: %d:%d transaction failed %d, size %zd-%zd\n",
1688                      proc->pid, thread->pid, return_error,
1689                      tr->data_size, tr->offsets_size);
1690
1691         {
1692                 struct binder_transaction_log_entry *fe;
1693                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1694                 *fe = *e;
1695         }
1696
1697         BUG_ON(thread->return_error != BR_OK);
1698         if (in_reply_to) {
1699                 thread->return_error = BR_TRANSACTION_COMPLETE;
1700                 binder_send_failed_reply(in_reply_to, return_error);
1701         } else
1702                 thread->return_error = return_error;
1703 }
1704
1705 int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1706                         void __user *buffer, int size, signed long *consumed)
1707 {
1708         uint32_t cmd;
1709         void __user *ptr = buffer + *consumed;
1710         void __user *end = buffer + size;
1711
1712         while (ptr < end && thread->return_error == BR_OK) {
1713                 if (get_user(cmd, (uint32_t __user *)ptr))
1714                         return -EFAULT;
1715                 ptr += sizeof(uint32_t);
1716                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1717                         binder_stats.bc[_IOC_NR(cmd)]++;
1718                         proc->stats.bc[_IOC_NR(cmd)]++;
1719                         thread->stats.bc[_IOC_NR(cmd)]++;
1720                 }
1721                 switch (cmd) {
1722                 case BC_INCREFS:
1723                 case BC_ACQUIRE:
1724                 case BC_RELEASE:
1725                 case BC_DECREFS: {
1726                         uint32_t target;
1727                         struct binder_ref *ref;
1728                         const char *debug_string;
1729
1730                         if (get_user(target, (uint32_t __user *)ptr))
1731                                 return -EFAULT;
1732                         ptr += sizeof(uint32_t);
1733                         if (target == 0 && binder_context_mgr_node &&
1734                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1735                                 ref = binder_get_ref_for_node(proc,
1736                                                binder_context_mgr_node);
1737                                 if (ref->desc != target) {
1738                                         binder_user_error("binder: %d:"
1739                                                 "%d tried to acquire "
1740                                                 "reference to desc 0, "
1741                                                 "got %d instead\n",
1742                                                 proc->pid, thread->pid,
1743                                                 ref->desc);
1744                                 }
1745                         } else
1746                                 ref = binder_get_ref(proc, target);
1747                         if (ref == NULL) {
1748                                 binder_user_error("binder: %d:%d refcou"
1749                                         "nt change on invalid ref %d\n",
1750                                         proc->pid, thread->pid, target);
1751                                 break;
1752                         }
1753                         switch (cmd) {
1754                         case BC_INCREFS:
1755                                 debug_string = "IncRefs";
1756                                 binder_inc_ref(ref, 0, NULL);
1757                                 break;
1758                         case BC_ACQUIRE:
1759                                 debug_string = "Acquire";
1760                                 binder_inc_ref(ref, 1, NULL);
1761                                 break;
1762                         case BC_RELEASE:
1763                                 debug_string = "Release";
1764                                 binder_dec_ref(ref, 1);
1765                                 break;
1766                         case BC_DECREFS:
1767                         default:
1768                                 debug_string = "DecRefs";
1769                                 binder_dec_ref(ref, 0);
1770                                 break;
1771                         }
1772                         binder_debug(BINDER_DEBUG_USER_REFS,
1773                                      "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1774                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1775                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1776                         break;
1777                 }
1778                 case BC_INCREFS_DONE:
1779                 case BC_ACQUIRE_DONE: {
1780                         void __user *node_ptr;
1781                         void *cookie;
1782                         struct binder_node *node;
1783
1784                         if (get_user(node_ptr, (void * __user *)ptr))
1785                                 return -EFAULT;
1786                         ptr += sizeof(void *);
1787                         if (get_user(cookie, (void * __user *)ptr))
1788                                 return -EFAULT;
1789                         ptr += sizeof(void *);
1790                         node = binder_get_node(proc, node_ptr);
1791                         if (node == NULL) {
1792                                 binder_user_error("binder: %d:%d "
1793                                         "%s u%p no match\n",
1794                                         proc->pid, thread->pid,
1795                                         cmd == BC_INCREFS_DONE ?
1796                                         "BC_INCREFS_DONE" :
1797                                         "BC_ACQUIRE_DONE",
1798                                         node_ptr);
1799                                 break;
1800                         }
1801                         if (cookie != node->cookie) {
1802                                 binder_user_error("binder: %d:%d %s u%p node %d"
1803                                         " cookie mismatch %p != %p\n",
1804                                         proc->pid, thread->pid,
1805                                         cmd == BC_INCREFS_DONE ?
1806                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1807                                         node_ptr, node->debug_id,
1808                                         cookie, node->cookie);
1809                                 break;
1810                         }
1811                         if (cmd == BC_ACQUIRE_DONE) {
1812                                 if (node->pending_strong_ref == 0) {
1813                                         binder_user_error("binder: %d:%d "
1814                                                 "BC_ACQUIRE_DONE node %d has "
1815                                                 "no pending acquire request\n",
1816                                                 proc->pid, thread->pid,
1817                                                 node->debug_id);
1818                                         break;
1819                                 }
1820                                 node->pending_strong_ref = 0;
1821                         } else {
1822                                 if (node->pending_weak_ref == 0) {
1823                                         binder_user_error("binder: %d:%d "
1824                                                 "BC_INCREFS_DONE node %d has "
1825                                                 "no pending increfs request\n",
1826                                                 proc->pid, thread->pid,
1827                                                 node->debug_id);
1828                                         break;
1829                                 }
1830                                 node->pending_weak_ref = 0;
1831                         }
1832                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1833                         binder_debug(BINDER_DEBUG_USER_REFS,
1834                                      "binder: %d:%d %s node %d ls %d lw %d\n",
1835                                      proc->pid, thread->pid,
1836                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1837                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1838                         break;
1839                 }
1840                 case BC_ATTEMPT_ACQUIRE:
1841                         pr_err("binder: BC_ATTEMPT_ACQUIRE not supported\n");
1842                         return -EINVAL;
1843                 case BC_ACQUIRE_RESULT:
1844                         pr_err("binder: BC_ACQUIRE_RESULT not supported\n");
1845                         return -EINVAL;
1846
1847                 case BC_FREE_BUFFER: {
1848                         void __user *data_ptr;
1849                         struct binder_buffer *buffer;
1850
1851                         if (get_user(data_ptr, (void * __user *)ptr))
1852                                 return -EFAULT;
1853                         ptr += sizeof(void *);
1854
1855                         buffer = binder_buffer_lookup(proc, data_ptr);
1856                         if (buffer == NULL) {
1857                                 binder_user_error("binder: %d:%d "
1858                                         "BC_FREE_BUFFER u%p no match\n",
1859                                         proc->pid, thread->pid, data_ptr);
1860                                 break;
1861                         }
1862                         if (!buffer->allow_user_free) {
1863                                 binder_user_error("binder: %d:%d "
1864                                         "BC_FREE_BUFFER u%p matched "
1865                                         "unreturned buffer\n",
1866                                         proc->pid, thread->pid, data_ptr);
1867                                 break;
1868                         }
1869                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1870                                      "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1871                                      proc->pid, thread->pid, data_ptr, buffer->debug_id,
1872                                      buffer->transaction ? "active" : "finished");
1873
1874                         if (buffer->transaction) {
1875                                 buffer->transaction->buffer = NULL;
1876                                 buffer->transaction = NULL;
1877                         }
1878                         if (buffer->async_transaction && buffer->target_node) {
1879                                 BUG_ON(!buffer->target_node->has_async_transaction);
1880                                 if (list_empty(&buffer->target_node->async_todo))
1881                                         buffer->target_node->has_async_transaction = 0;
1882                                 else
1883                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1884                         }
1885                         binder_transaction_buffer_release(proc, buffer, NULL);
1886                         binder_free_buf(proc, buffer);
1887                         break;
1888                 }
1889
1890                 case BC_TRANSACTION:
1891                 case BC_REPLY: {
1892                         struct binder_transaction_data tr;
1893
1894                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1895                                 return -EFAULT;
1896                         ptr += sizeof(tr);
1897                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1898                         break;
1899                 }
1900
1901                 case BC_REGISTER_LOOPER:
1902                         binder_debug(BINDER_DEBUG_THREADS,
1903                                      "binder: %d:%d BC_REGISTER_LOOPER\n",
1904                                      proc->pid, thread->pid);
1905                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1906                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1907                                 binder_user_error("binder: %d:%d ERROR:"
1908                                         " BC_REGISTER_LOOPER called "
1909                                         "after BC_ENTER_LOOPER\n",
1910                                         proc->pid, thread->pid);
1911                         } else if (proc->requested_threads == 0) {
1912                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1913                                 binder_user_error("binder: %d:%d ERROR:"
1914                                         " BC_REGISTER_LOOPER called "
1915                                         "without request\n",
1916                                         proc->pid, thread->pid);
1917                         } else {
1918                                 proc->requested_threads--;
1919                                 proc->requested_threads_started++;
1920                         }
1921                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1922                         break;
1923                 case BC_ENTER_LOOPER:
1924                         binder_debug(BINDER_DEBUG_THREADS,
1925                                      "binder: %d:%d BC_ENTER_LOOPER\n",
1926                                      proc->pid, thread->pid);
1927                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1928                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1929                                 binder_user_error("binder: %d:%d ERROR:"
1930                                         " BC_ENTER_LOOPER called after "
1931                                         "BC_REGISTER_LOOPER\n",
1932                                         proc->pid, thread->pid);
1933                         }
1934                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1935                         break;
1936                 case BC_EXIT_LOOPER:
1937                         binder_debug(BINDER_DEBUG_THREADS,
1938                                      "binder: %d:%d BC_EXIT_LOOPER\n",
1939                                      proc->pid, thread->pid);
1940                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1941                         break;
1942
1943                 case BC_REQUEST_DEATH_NOTIFICATION:
1944                 case BC_CLEAR_DEATH_NOTIFICATION: {
1945                         uint32_t target;
1946                         void __user *cookie;
1947                         struct binder_ref *ref;
1948                         struct binder_ref_death *death;
1949
1950                         if (get_user(target, (uint32_t __user *)ptr))
1951                                 return -EFAULT;
1952                         ptr += sizeof(uint32_t);
1953                         if (get_user(cookie, (void __user * __user *)ptr))
1954                                 return -EFAULT;
1955                         ptr += sizeof(void *);
1956                         ref = binder_get_ref(proc, target);
1957                         if (ref == NULL) {
1958                                 binder_user_error("binder: %d:%d %s "
1959                                         "invalid ref %d\n",
1960                                         proc->pid, thread->pid,
1961                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1962                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1963                                         "BC_CLEAR_DEATH_NOTIFICATION",
1964                                         target);
1965                                 break;
1966                         }
1967
1968                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1969                                      "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
1970                                      proc->pid, thread->pid,
1971                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1972                                      "BC_REQUEST_DEATH_NOTIFICATION" :
1973                                      "BC_CLEAR_DEATH_NOTIFICATION",
1974                                      cookie, ref->debug_id, ref->desc,
1975                                      ref->strong, ref->weak, ref->node->debug_id);
1976
1977                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1978                                 if (ref->death) {
1979                                         binder_user_error("binder: %d:%"
1980                                                 "d BC_REQUEST_DEATH_NOTI"
1981                                                 "FICATION death notific"
1982                                                 "ation already set\n",
1983                                                 proc->pid, thread->pid);
1984                                         break;
1985                                 }
1986                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
1987                                 if (death == NULL) {
1988                                         thread->return_error = BR_ERROR;
1989                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1990                                                      "binder: %d:%d "
1991                                                      "BC_REQUEST_DEATH_NOTIFICATION failed\n",
1992                                                      proc->pid, thread->pid);
1993                                         break;
1994                                 }
1995                                 binder_stats_created(BINDER_STAT_DEATH);
1996                                 INIT_LIST_HEAD(&death->work.entry);
1997                                 death->cookie = cookie;
1998                                 ref->death = death;
1999                                 if (ref->node->proc == NULL) {
2000                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2001                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2002                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2003                                         } else {
2004                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2005                                                 wake_up_interruptible(&proc->wait);
2006                                         }
2007                                 }
2008                         } else {
2009                                 if (ref->death == NULL) {
2010                                         binder_user_error("binder: %d:%"
2011                                                 "d BC_CLEAR_DEATH_NOTIFI"
2012                                                 "CATION death notificat"
2013                                                 "ion not active\n",
2014                                                 proc->pid, thread->pid);
2015                                         break;
2016                                 }
2017                                 death = ref->death;
2018                                 if (death->cookie != cookie) {
2019                                         binder_user_error("binder: %d:%"
2020                                                 "d BC_CLEAR_DEATH_NOTIFI"
2021                                                 "CATION death notificat"
2022                                                 "ion cookie mismatch "
2023                                                 "%p != %p\n",
2024                                                 proc->pid, thread->pid,
2025                                                 death->cookie, cookie);
2026                                         break;
2027                                 }
2028                                 ref->death = NULL;
2029                                 if (list_empty(&death->work.entry)) {
2030                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2031                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2032                                                 list_add_tail(&death->work.entry, &thread->todo);
2033                                         } else {
2034                                                 list_add_tail(&death->work.entry, &proc->todo);
2035                                                 wake_up_interruptible(&proc->wait);
2036                                         }
2037                                 } else {
2038                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2039                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2040                                 }
2041                         }
2042                 } break;
2043                 case BC_DEAD_BINDER_DONE: {
2044                         struct binder_work *w;
2045                         void __user *cookie;
2046                         struct binder_ref_death *death = NULL;
2047                         if (get_user(cookie, (void __user * __user *)ptr))
2048                                 return -EFAULT;
2049
2050                         ptr += sizeof(void *);
2051                         list_for_each_entry(w, &proc->delivered_death, entry) {
2052                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2053                                 if (tmp_death->cookie == cookie) {
2054                                         death = tmp_death;
2055                                         break;
2056                                 }
2057                         }
2058                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2059                                      "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2060                                      proc->pid, thread->pid, cookie, death);
2061                         if (death == NULL) {
2062                                 binder_user_error("binder: %d:%d BC_DEAD"
2063                                         "_BINDER_DONE %p not found\n",
2064                                         proc->pid, thread->pid, cookie);
2065                                 break;
2066                         }
2067
2068                         list_del_init(&death->work.entry);
2069                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2070                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2071                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2072                                         list_add_tail(&death->work.entry, &thread->todo);
2073                                 } else {
2074                                         list_add_tail(&death->work.entry, &proc->todo);
2075                                         wake_up_interruptible(&proc->wait);
2076                                 }
2077                         }
2078                 } break;
2079
2080                 default:
2081                         pr_err("binder: %d:%d unknown command %d\n",
2082                                proc->pid, thread->pid, cmd);
2083                         return -EINVAL;
2084                 }
2085                 *consumed = ptr - buffer;
2086         }
2087         return 0;
2088 }
2089
2090 void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2091                     uint32_t cmd)
2092 {
2093         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2094                 binder_stats.br[_IOC_NR(cmd)]++;
2095                 proc->stats.br[_IOC_NR(cmd)]++;
2096                 thread->stats.br[_IOC_NR(cmd)]++;
2097         }
2098 }
2099
2100 static int binder_has_proc_work(struct binder_proc *proc,
2101                                 struct binder_thread *thread)
2102 {
2103         return !list_empty(&proc->todo) ||
2104                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2105 }
2106
2107 static int binder_has_thread_work(struct binder_thread *thread)
2108 {
2109         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2110                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2111 }
2112
2113 static int binder_thread_read(struct binder_proc *proc,
2114                               struct binder_thread *thread,
2115                               void  __user *buffer, int size,
2116                               signed long *consumed, int non_block)
2117 {
2118         void __user *ptr = buffer + *consumed;
2119         void __user *end = buffer + size;
2120
2121         int ret = 0;
2122         int wait_for_proc_work;
2123
2124         if (*consumed == 0) {
2125                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2126                         return -EFAULT;
2127                 ptr += sizeof(uint32_t);
2128         }
2129
2130 retry:
2131         wait_for_proc_work = thread->transaction_stack == NULL &&
2132                                 list_empty(&thread->todo);
2133
2134         if (thread->return_error != BR_OK && ptr < end) {
2135                 if (thread->return_error2 != BR_OK) {
2136                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2137                                 return -EFAULT;
2138                         ptr += sizeof(uint32_t);
2139                         if (ptr == end)
2140                                 goto done;
2141                         thread->return_error2 = BR_OK;
2142                 }
2143                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2144                         return -EFAULT;
2145                 ptr += sizeof(uint32_t);
2146                 thread->return_error = BR_OK;
2147                 goto done;
2148         }
2149
2150
2151         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2152         if (wait_for_proc_work)
2153                 proc->ready_threads++;
2154         mutex_unlock(&binder_lock);
2155         if (wait_for_proc_work) {
2156                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2157                                         BINDER_LOOPER_STATE_ENTERED))) {
2158                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
2159                                 "for process work before calling BC_REGISTER_"
2160                                 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2161                                 proc->pid, thread->pid, thread->looper);
2162                         wait_event_interruptible(binder_user_error_wait,
2163                                                  binder_stop_on_user_error < 2);
2164                 }
2165                 binder_set_nice(proc->default_priority);
2166                 if (non_block) {
2167                         if (!binder_has_proc_work(proc, thread))
2168                                 ret = -EAGAIN;
2169                 } else
2170                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2171         } else {
2172                 if (non_block) {
2173                         if (!binder_has_thread_work(thread))
2174                                 ret = -EAGAIN;
2175                 } else
2176                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2177         }
2178         mutex_lock(&binder_lock);
2179         if (wait_for_proc_work)
2180                 proc->ready_threads--;
2181         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2182
2183         if (ret)
2184                 return ret;
2185
2186         while (1) {
2187                 uint32_t cmd;
2188                 struct binder_transaction_data tr;
2189                 struct binder_work *w;
2190                 struct binder_transaction *t = NULL;
2191
2192                 if (!list_empty(&thread->todo))
2193                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2194                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2195                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2196                 else {
2197                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2198                                 goto retry;
2199                         break;
2200                 }
2201
2202                 if (end - ptr < sizeof(tr) + 4)
2203                         break;
2204
2205                 switch (w->type) {
2206                 case BINDER_WORK_TRANSACTION: {
2207                         t = container_of(w, struct binder_transaction, work);
2208                 } break;
2209                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2210                         cmd = BR_TRANSACTION_COMPLETE;
2211                         if (put_user(cmd, (uint32_t __user *)ptr))
2212                                 return -EFAULT;
2213                         ptr += sizeof(uint32_t);
2214
2215                         binder_stat_br(proc, thread, cmd);
2216                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2217                                      "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2218                                      proc->pid, thread->pid);
2219
2220                         list_del(&w->entry);
2221                         kfree(w);
2222                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2223                 } break;
2224                 case BINDER_WORK_NODE: {
2225                         struct binder_node *node = container_of(w, struct binder_node, work);
2226                         uint32_t cmd = BR_NOOP;
2227                         const char *cmd_name;
2228                         int strong = node->internal_strong_refs || node->local_strong_refs;
2229                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2230                         if (weak && !node->has_weak_ref) {
2231                                 cmd = BR_INCREFS;
2232                                 cmd_name = "BR_INCREFS";
2233                                 node->has_weak_ref = 1;
2234                                 node->pending_weak_ref = 1;
2235                                 node->local_weak_refs++;
2236                         } else if (strong && !node->has_strong_ref) {
2237                                 cmd = BR_ACQUIRE;
2238                                 cmd_name = "BR_ACQUIRE";
2239                                 node->has_strong_ref = 1;
2240                                 node->pending_strong_ref = 1;
2241                                 node->local_strong_refs++;
2242                         } else if (!strong && node->has_strong_ref) {
2243                                 cmd = BR_RELEASE;
2244                                 cmd_name = "BR_RELEASE";
2245                                 node->has_strong_ref = 0;
2246                         } else if (!weak && node->has_weak_ref) {
2247                                 cmd = BR_DECREFS;
2248                                 cmd_name = "BR_DECREFS";
2249                                 node->has_weak_ref = 0;
2250                         }
2251                         if (cmd != BR_NOOP) {
2252                                 if (put_user(cmd, (uint32_t __user *)ptr))
2253                                         return -EFAULT;
2254                                 ptr += sizeof(uint32_t);
2255                                 if (put_user(node->ptr, (void * __user *)ptr))
2256                                         return -EFAULT;
2257                                 ptr += sizeof(void *);
2258                                 if (put_user(node->cookie, (void * __user *)ptr))
2259                                         return -EFAULT;
2260                                 ptr += sizeof(void *);
2261
2262                                 binder_stat_br(proc, thread, cmd);
2263                                 binder_debug(BINDER_DEBUG_USER_REFS,
2264                                              "binder: %d:%d %s %d u%p c%p\n",
2265                                              proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2266                         } else {
2267                                 list_del_init(&w->entry);
2268                                 if (!weak && !strong) {
2269                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2270                                                      "binder: %d:%d node %d u%p c%p deleted\n",
2271                                                      proc->pid, thread->pid, node->debug_id,
2272                                                      node->ptr, node->cookie);
2273                                         rb_erase(&node->rb_node, &proc->nodes);
2274                                         kfree(node);
2275                                         binder_stats_deleted(BINDER_STAT_NODE);
2276                                 } else {
2277                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2278                                                      "binder: %d:%d node %d u%p c%p state unchanged\n",
2279                                                      proc->pid, thread->pid, node->debug_id, node->ptr,
2280                                                      node->cookie);
2281                                 }
2282                         }
2283                 } break;
2284                 case BINDER_WORK_DEAD_BINDER:
2285                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2286                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2287                         struct binder_ref_death *death;
2288                         uint32_t cmd;
2289
2290                         death = container_of(w, struct binder_ref_death, work);
2291                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2292                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2293                         else
2294                                 cmd = BR_DEAD_BINDER;
2295                         if (put_user(cmd, (uint32_t __user *)ptr))
2296                                 return -EFAULT;
2297                         ptr += sizeof(uint32_t);
2298                         if (put_user(death->cookie, (void * __user *)ptr))
2299                                 return -EFAULT;
2300                         ptr += sizeof(void *);
2301                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2302                                      "binder: %d:%d %s %p\n",
2303                                       proc->pid, thread->pid,
2304                                       cmd == BR_DEAD_BINDER ?
2305                                       "BR_DEAD_BINDER" :
2306                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2307                                       death->cookie);
2308
2309                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2310                                 list_del(&w->entry);
2311                                 kfree(death);
2312                                 binder_stats_deleted(BINDER_STAT_DEATH);
2313                         } else
2314                                 list_move(&w->entry, &proc->delivered_death);
2315                         if (cmd == BR_DEAD_BINDER)
2316                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2317                 } break;
2318                 }
2319
2320                 if (!t)
2321                         continue;
2322
2323                 BUG_ON(t->buffer == NULL);
2324                 if (t->buffer->target_node) {
2325                         struct binder_node *target_node = t->buffer->target_node;
2326                         tr.target.ptr = target_node->ptr;
2327                         tr.cookie =  target_node->cookie;
2328                         t->saved_priority = task_nice(current);
2329                         if (t->priority < target_node->min_priority &&
2330                             !(t->flags & TF_ONE_WAY))
2331                                 binder_set_nice(t->priority);
2332                         else if (!(t->flags & TF_ONE_WAY) ||
2333                                  t->saved_priority > target_node->min_priority)
2334                                 binder_set_nice(target_node->min_priority);
2335                         cmd = BR_TRANSACTION;
2336                 } else {
2337                         tr.target.ptr = NULL;
2338                         tr.cookie = NULL;
2339                         cmd = BR_REPLY;
2340                 }
2341                 tr.code = t->code;
2342                 tr.flags = t->flags;
2343                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2344
2345                 if (t->from) {
2346                         struct task_struct *sender = t->from->proc->tsk;
2347                         tr.sender_pid = task_tgid_nr_ns(sender,
2348                                                         task_active_pid_ns(current));
2349                 } else {
2350                         tr.sender_pid = 0;
2351                 }
2352
2353                 tr.data_size = t->buffer->data_size;
2354                 tr.offsets_size = t->buffer->offsets_size;
2355                 tr.data.ptr.buffer = (void *)t->buffer->data +
2356                                         proc->user_buffer_offset;
2357                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2358                                         ALIGN(t->buffer->data_size,
2359                                             sizeof(void *));
2360
2361                 if (put_user(cmd, (uint32_t __user *)ptr))
2362                         return -EFAULT;
2363                 ptr += sizeof(uint32_t);
2364                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2365                         return -EFAULT;
2366                 ptr += sizeof(tr);
2367
2368                 binder_stat_br(proc, thread, cmd);
2369                 binder_debug(BINDER_DEBUG_TRANSACTION,
2370                              "binder: %d:%d %s %d %d:%d, cmd %d"
2371                              "size %zd-%zd ptr %p-%p\n",
2372                              proc->pid, thread->pid,
2373                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2374                              "BR_REPLY",
2375                              t->debug_id, t->from ? t->from->proc->pid : 0,
2376                              t->from ? t->from->pid : 0, cmd,
2377                              t->buffer->data_size, t->buffer->offsets_size,
2378                              tr.data.ptr.buffer, tr.data.ptr.offsets);
2379
2380                 list_del(&t->work.entry);
2381                 t->buffer->allow_user_free = 1;
2382                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2383                         t->to_parent = thread->transaction_stack;
2384                         t->to_thread = thread;
2385                         thread->transaction_stack = t;
2386                 } else {
2387                         t->buffer->transaction = NULL;
2388                         kfree(t);
2389                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2390                 }
2391                 break;
2392         }
2393
2394 done:
2395
2396         *consumed = ptr - buffer;
2397         if (proc->requested_threads + proc->ready_threads == 0 &&
2398             proc->requested_threads_started < proc->max_threads &&
2399             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2400              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2401              /*spawn a new thread if we leave this out */) {
2402                 proc->requested_threads++;
2403                 binder_debug(BINDER_DEBUG_THREADS,
2404                              "binder: %d:%d BR_SPAWN_LOOPER\n",
2405                              proc->pid, thread->pid);
2406                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2407                         return -EFAULT;
2408         }
2409         return 0;
2410 }
2411
2412 static void binder_release_work(struct list_head *list)
2413 {
2414         struct binder_work *w;
2415         while (!list_empty(list)) {
2416                 w = list_first_entry(list, struct binder_work, entry);
2417                 list_del_init(&w->entry);
2418                 switch (w->type) {
2419                 case BINDER_WORK_TRANSACTION: {
2420                         struct binder_transaction *t;
2421
2422                         t = container_of(w, struct binder_transaction, work);
2423                         if (t->buffer->target_node &&
2424                             !(t->flags & TF_ONE_WAY)) {
2425                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2426                         } else {
2427                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2428                                         "binder: undelivered transaction %d\n",
2429                                         t->debug_id);
2430                                 t->buffer->transaction = NULL;
2431                                 kfree(t);
2432                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2433                         }
2434                 } break;
2435                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2436                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2437                                 "binder: undelivered TRANSACTION_COMPLETE\n");
2438                         kfree(w);
2439                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2440                 } break;
2441                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2442                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2443                         struct binder_ref_death *death;
2444
2445                         death = container_of(w, struct binder_ref_death, work);
2446                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2447                                 "binder: undelivered death notification, %p\n",
2448                                 death->cookie);
2449                         kfree(death);
2450                         binder_stats_deleted(BINDER_STAT_DEATH);
2451                 } break;
2452                 default:
2453                         pr_err("binder: unexpected work type, %d, not freed\n",
2454                                w->type);
2455                         break;
2456                 }
2457         }
2458
2459 }
2460
2461 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2462 {
2463         struct binder_thread *thread = NULL;
2464         struct rb_node *parent = NULL;
2465         struct rb_node **p = &proc->threads.rb_node;
2466
2467         while (*p) {
2468                 parent = *p;
2469                 thread = rb_entry(parent, struct binder_thread, rb_node);
2470
2471                 if (current->pid < thread->pid)
2472                         p = &(*p)->rb_left;
2473                 else if (current->pid > thread->pid)
2474                         p = &(*p)->rb_right;
2475                 else
2476                         break;
2477         }
2478         if (*p == NULL) {
2479                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2480                 if (thread == NULL)
2481                         return NULL;
2482                 binder_stats_created(BINDER_STAT_THREAD);
2483                 thread->proc = proc;
2484                 thread->pid = current->pid;
2485                 init_waitqueue_head(&thread->wait);
2486                 INIT_LIST_HEAD(&thread->todo);
2487                 rb_link_node(&thread->rb_node, parent, p);
2488                 rb_insert_color(&thread->rb_node, &proc->threads);
2489                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2490                 thread->return_error = BR_OK;
2491                 thread->return_error2 = BR_OK;
2492         }
2493         return thread;
2494 }
2495
2496 static int binder_free_thread(struct binder_proc *proc,
2497                               struct binder_thread *thread)
2498 {
2499         struct binder_transaction *t;
2500         struct binder_transaction *send_reply = NULL;
2501         int active_transactions = 0;
2502
2503         rb_erase(&thread->rb_node, &proc->threads);
2504         t = thread->transaction_stack;
2505         if (t && t->to_thread == thread)
2506                 send_reply = t;
2507         while (t) {
2508                 active_transactions++;
2509                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2510                              "binder: release %d:%d transaction %d "
2511                              "%s, still active\n", proc->pid, thread->pid,
2512                              t->debug_id,
2513                              (t->to_thread == thread) ? "in" : "out");
2514
2515                 if (t->to_thread == thread) {
2516                         t->to_proc = NULL;
2517                         t->to_thread = NULL;
2518                         if (t->buffer) {
2519                                 t->buffer->transaction = NULL;
2520                                 t->buffer = NULL;
2521                         }
2522                         t = t->to_parent;
2523                 } else if (t->from == thread) {
2524                         t->from = NULL;
2525                         t = t->from_parent;
2526                 } else
2527                         BUG();
2528         }
2529         if (send_reply)
2530                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2531         binder_release_work(&thread->todo);
2532         kfree(thread);
2533         binder_stats_deleted(BINDER_STAT_THREAD);
2534         return active_transactions;
2535 }
2536
2537 static unsigned int binder_poll(struct file *filp,
2538                                 struct poll_table_struct *wait)
2539 {
2540         struct binder_proc *proc = filp->private_data;
2541         struct binder_thread *thread = NULL;
2542         int wait_for_proc_work;
2543
2544         mutex_lock(&binder_lock);
2545         thread = binder_get_thread(proc);
2546
2547         wait_for_proc_work = thread->transaction_stack == NULL &&
2548                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2549         mutex_unlock(&binder_lock);
2550
2551         if (wait_for_proc_work) {
2552                 if (binder_has_proc_work(proc, thread))
2553                         return POLLIN;
2554                 poll_wait(filp, &proc->wait, wait);
2555                 if (binder_has_proc_work(proc, thread))
2556                         return POLLIN;
2557         } else {
2558                 if (binder_has_thread_work(thread))
2559                         return POLLIN;
2560                 poll_wait(filp, &thread->wait, wait);
2561                 if (binder_has_thread_work(thread))
2562                         return POLLIN;
2563         }
2564         return 0;
2565 }
2566
2567 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2568 {
2569         int ret;
2570         struct binder_proc *proc = filp->private_data;
2571         struct binder_thread *thread;
2572         unsigned int size = _IOC_SIZE(cmd);
2573         void __user *ubuf = (void __user *)arg;
2574
2575         /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2576
2577         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2578         if (ret)
2579                 return ret;
2580
2581         mutex_lock(&binder_lock);
2582         thread = binder_get_thread(proc);
2583         if (thread == NULL) {
2584                 ret = -ENOMEM;
2585                 goto err;
2586         }
2587
2588         switch (cmd) {
2589         case BINDER_WRITE_READ: {
2590                 struct binder_write_read bwr;
2591                 if (size != sizeof(struct binder_write_read)) {
2592                         ret = -EINVAL;
2593                         goto err;
2594                 }
2595                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2596                         ret = -EFAULT;
2597                         goto err;
2598                 }
2599                 binder_debug(BINDER_DEBUG_READ_WRITE,
2600                              "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2601                              proc->pid, thread->pid, bwr.write_size, bwr.write_buffer,
2602                              bwr.read_size, bwr.read_buffer);
2603
2604                 if (bwr.write_size > 0) {
2605                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2606                         if (ret < 0) {
2607                                 bwr.read_consumed = 0;
2608                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2609                                         ret = -EFAULT;
2610                                 goto err;
2611                         }
2612                 }
2613                 if (bwr.read_size > 0) {
2614                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2615                         if (!list_empty(&proc->todo))
2616                                 wake_up_interruptible(&proc->wait);
2617                         if (ret < 0) {
2618                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2619                                         ret = -EFAULT;
2620                                 goto err;
2621                         }
2622                 }
2623                 binder_debug(BINDER_DEBUG_READ_WRITE,
2624                              "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2625                              proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2626                              bwr.read_consumed, bwr.read_size);
2627                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2628                         ret = -EFAULT;
2629                         goto err;
2630                 }
2631                 break;
2632         }
2633         case BINDER_SET_MAX_THREADS:
2634                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2635                         ret = -EINVAL;
2636                         goto err;
2637                 }
2638                 break;
2639         case BINDER_SET_CONTEXT_MGR:
2640                 if (binder_context_mgr_node != NULL) {
2641                         pr_err("binder: BINDER_SET_CONTEXT_MGR already set\n");
2642                         ret = -EBUSY;
2643                         goto err;
2644                 }
2645                 if (uid_valid(binder_context_mgr_uid)) {
2646                         if (!uid_eq(binder_context_mgr_uid, current->cred->euid)) {
2647                                 pr_err("binder: BINDER_SET_"
2648                                        "CONTEXT_MGR bad uid %d != %d\n",
2649                                        from_kuid(&init_user_ns, current->cred->euid),
2650                                        from_kuid(&init_user_ns, binder_context_mgr_uid));
2651                                 ret = -EPERM;
2652                                 goto err;
2653                         }
2654                 } else
2655                         binder_context_mgr_uid = current->cred->euid;
2656                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2657                 if (binder_context_mgr_node == NULL) {
2658                         ret = -ENOMEM;
2659                         goto err;
2660                 }
2661                 binder_context_mgr_node->local_weak_refs++;
2662                 binder_context_mgr_node->local_strong_refs++;
2663                 binder_context_mgr_node->has_strong_ref = 1;
2664                 binder_context_mgr_node->has_weak_ref = 1;
2665                 break;
2666         case BINDER_THREAD_EXIT:
2667                 binder_debug(BINDER_DEBUG_THREADS, "binder: %d:%d exit\n",
2668                              proc->pid, thread->pid);
2669                 binder_free_thread(proc, thread);
2670                 thread = NULL;
2671                 break;
2672         case BINDER_VERSION:
2673                 if (size != sizeof(struct binder_version)) {
2674                         ret = -EINVAL;
2675                         goto err;
2676                 }
2677                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2678                         ret = -EINVAL;
2679                         goto err;
2680                 }
2681                 break;
2682         default:
2683                 ret = -EINVAL;
2684                 goto err;
2685         }
2686         ret = 0;
2687 err:
2688         if (thread)
2689                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2690         mutex_unlock(&binder_lock);
2691         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2692         if (ret && ret != -ERESTARTSYS)
2693                 pr_info("binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2694         return ret;
2695 }
2696
2697 static void binder_vma_open(struct vm_area_struct *vma)
2698 {
2699         struct binder_proc *proc = vma->vm_private_data;
2700         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2701                      "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2702                      proc->pid, vma->vm_start, vma->vm_end,
2703                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2704                      (unsigned long)pgprot_val(vma->vm_page_prot));
2705 }
2706
2707 static void binder_vma_close(struct vm_area_struct *vma)
2708 {
2709         struct binder_proc *proc = vma->vm_private_data;
2710         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2711                      "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2712                      proc->pid, vma->vm_start, vma->vm_end,
2713                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2714                      (unsigned long)pgprot_val(vma->vm_page_prot));
2715         proc->vma = NULL;
2716         proc->vma_vm_mm = NULL;
2717         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2718 }
2719
2720 static struct vm_operations_struct binder_vm_ops = {
2721         .open = binder_vma_open,
2722         .close = binder_vma_close,
2723 };
2724
2725 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2726 {
2727         int ret;
2728         struct vm_struct *area;
2729         struct binder_proc *proc = filp->private_data;
2730         const char *failure_string;
2731         struct binder_buffer *buffer;
2732
2733         if (proc->tsk != current)
2734                 return -EINVAL;
2735
2736         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2737                 vma->vm_end = vma->vm_start + SZ_4M;
2738
2739         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2740                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2741                      proc->pid, vma->vm_start, vma->vm_end,
2742                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2743                      (unsigned long)pgprot_val(vma->vm_page_prot));
2744
2745         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2746                 ret = -EPERM;
2747                 failure_string = "bad vm_flags";
2748                 goto err_bad_arg;
2749         }
2750         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2751
2752         mutex_lock(&binder_mmap_lock);
2753         if (proc->buffer) {
2754                 ret = -EBUSY;
2755                 failure_string = "already mapped";
2756                 goto err_already_mapped;
2757         }
2758
2759         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2760         if (area == NULL) {
2761                 ret = -ENOMEM;
2762                 failure_string = "get_vm_area";
2763                 goto err_get_vm_area_failed;
2764         }
2765         proc->buffer = area->addr;
2766         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2767         mutex_unlock(&binder_mmap_lock);
2768
2769 #ifdef CONFIG_CPU_CACHE_VIPT
2770         if (cache_is_vipt_aliasing()) {
2771                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2772                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2773                         vma->vm_start += PAGE_SIZE;
2774                 }
2775         }
2776 #endif
2777         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2778         if (proc->pages == NULL) {
2779                 ret = -ENOMEM;
2780                 failure_string = "alloc page array";
2781                 goto err_alloc_pages_failed;
2782         }
2783         proc->buffer_size = vma->vm_end - vma->vm_start;
2784
2785         vma->vm_ops = &binder_vm_ops;
2786         vma->vm_private_data = proc;
2787
2788         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2789                 ret = -ENOMEM;
2790                 failure_string = "alloc small buf";
2791                 goto err_alloc_small_buf_failed;
2792         }
2793         buffer = proc->buffer;
2794         INIT_LIST_HEAD(&proc->buffers);
2795         list_add(&buffer->entry, &proc->buffers);
2796         buffer->free = 1;
2797         binder_insert_free_buffer(proc, buffer);
2798         proc->free_async_space = proc->buffer_size / 2;
2799         barrier();
2800         proc->files = get_files_struct(current);
2801         proc->vma = vma;
2802         proc->vma_vm_mm = vma->vm_mm;
2803
2804         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2805                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2806         return 0;
2807
2808 err_alloc_small_buf_failed:
2809         kfree(proc->pages);
2810         proc->pages = NULL;
2811 err_alloc_pages_failed:
2812         mutex_lock(&binder_mmap_lock);
2813         vfree(proc->buffer);
2814         proc->buffer = NULL;
2815 err_get_vm_area_failed:
2816 err_already_mapped:
2817         mutex_unlock(&binder_mmap_lock);
2818 err_bad_arg:
2819         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2820                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2821         return ret;
2822 }
2823
2824 static int binder_open(struct inode *nodp, struct file *filp)
2825 {
2826         struct binder_proc *proc;
2827
2828         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2829                      current->group_leader->pid, current->pid);
2830
2831         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2832         if (proc == NULL)
2833                 return -ENOMEM;
2834         get_task_struct(current);
2835         proc->tsk = current;
2836         INIT_LIST_HEAD(&proc->todo);
2837         init_waitqueue_head(&proc->wait);
2838         proc->default_priority = task_nice(current);
2839         mutex_lock(&binder_lock);
2840         binder_stats_created(BINDER_STAT_PROC);
2841         hlist_add_head(&proc->proc_node, &binder_procs);
2842         proc->pid = current->group_leader->pid;
2843         INIT_LIST_HEAD(&proc->delivered_death);
2844         filp->private_data = proc;
2845         mutex_unlock(&binder_lock);
2846
2847         if (binder_debugfs_dir_entry_proc) {
2848                 char strbuf[11];
2849                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2850                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2851                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2852         }
2853
2854         return 0;
2855 }
2856
2857 static int binder_flush(struct file *filp, fl_owner_t id)
2858 {
2859         struct binder_proc *proc = filp->private_data;
2860
2861         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2862
2863         return 0;
2864 }
2865
2866 static void binder_deferred_flush(struct binder_proc *proc)
2867 {
2868         struct rb_node *n;
2869         int wake_count = 0;
2870         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2871                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2872                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2873                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2874                         wake_up_interruptible(&thread->wait);
2875                         wake_count++;
2876                 }
2877         }
2878         wake_up_interruptible_all(&proc->wait);
2879
2880         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2881                      "binder_flush: %d woke %d threads\n", proc->pid,
2882                      wake_count);
2883 }
2884
2885 static int binder_release(struct inode *nodp, struct file *filp)
2886 {
2887         struct binder_proc *proc = filp->private_data;
2888         debugfs_remove(proc->debugfs_entry);
2889         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2890
2891         return 0;
2892 }
2893
2894 static void binder_deferred_release(struct binder_proc *proc)
2895 {
2896         struct hlist_node *pos;
2897         struct binder_transaction *t;
2898         struct rb_node *n;
2899         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2900
2901         BUG_ON(proc->vma);
2902         BUG_ON(proc->files);
2903
2904         hlist_del(&proc->proc_node);
2905         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2906                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2907                              "binder_release: %d context_mgr_node gone\n",
2908                              proc->pid);
2909                 binder_context_mgr_node = NULL;
2910         }
2911
2912         threads = 0;
2913         active_transactions = 0;
2914         while ((n = rb_first(&proc->threads))) {
2915                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2916                 threads++;
2917                 active_transactions += binder_free_thread(proc, thread);
2918         }
2919         nodes = 0;
2920         incoming_refs = 0;
2921         while ((n = rb_first(&proc->nodes))) {
2922                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2923
2924                 nodes++;
2925                 rb_erase(&node->rb_node, &proc->nodes);
2926                 list_del_init(&node->work.entry);
2927                 binder_release_work(&node->async_todo);
2928                 if (hlist_empty(&node->refs)) {
2929                         kfree(node);
2930                         binder_stats_deleted(BINDER_STAT_NODE);
2931                 } else {
2932                         struct binder_ref *ref;
2933                         int death = 0;
2934
2935                         node->proc = NULL;
2936                         node->local_strong_refs = 0;
2937                         node->local_weak_refs = 0;
2938                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2939
2940                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2941                                 incoming_refs++;
2942                                 if (ref->death) {
2943                                         death++;
2944                                         if (list_empty(&ref->death->work.entry)) {
2945                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2946                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2947                                                 wake_up_interruptible(&ref->proc->wait);
2948                                         } else
2949                                                 BUG();
2950                                 }
2951                         }
2952                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2953                                      "binder: node %d now dead, "
2954                                      "refs %d, death %d\n", node->debug_id,
2955                                      incoming_refs, death);
2956                 }
2957         }
2958         outgoing_refs = 0;
2959         while ((n = rb_first(&proc->refs_by_desc))) {
2960                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
2961                                                   rb_node_desc);
2962                 outgoing_refs++;
2963                 binder_delete_ref(ref);
2964         }
2965         binder_release_work(&proc->todo);
2966         binder_release_work(&proc->delivered_death);
2967         buffers = 0;
2968
2969         while ((n = rb_first(&proc->allocated_buffers))) {
2970                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
2971                                                         rb_node);
2972                 t = buffer->transaction;
2973                 if (t) {
2974                         t->buffer = NULL;
2975                         buffer->transaction = NULL;
2976                         pr_err("binder: release proc %d, "
2977                                "transaction %d, not freed\n",
2978                                proc->pid, t->debug_id);
2979                         /*BUG();*/
2980                 }
2981                 binder_free_buf(proc, buffer);
2982                 buffers++;
2983         }
2984
2985         binder_stats_deleted(BINDER_STAT_PROC);
2986
2987         page_count = 0;
2988         if (proc->pages) {
2989                 int i;
2990                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
2991                         if (proc->pages[i]) {
2992                                 void *page_addr = proc->buffer + i * PAGE_SIZE;
2993                                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
2994                                              "binder_release: %d: "
2995                                              "page %d at %p not freed\n",
2996                                              proc->pid, i,
2997                                              page_addr);
2998                                 unmap_kernel_range((unsigned long)page_addr,
2999                                         PAGE_SIZE);
3000                                 __free_page(proc->pages[i]);
3001                                 page_count++;
3002                         }
3003                 }
3004                 kfree(proc->pages);
3005                 vfree(proc->buffer);
3006         }
3007
3008         put_task_struct(proc->tsk);
3009
3010         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3011                      "binder_release: %d threads %d, nodes %d (ref %d), "
3012                      "refs %d, active transactions %d, buffers %d, "
3013                      "pages %d\n",
3014                      proc->pid, threads, nodes, incoming_refs, outgoing_refs,
3015                      active_transactions, buffers, page_count);
3016
3017         kfree(proc);
3018 }
3019
3020 static void binder_deferred_func(struct work_struct *work)
3021 {
3022         struct binder_proc *proc;
3023         struct files_struct *files;
3024
3025         int defer;
3026         do {
3027                 mutex_lock(&binder_lock);
3028                 mutex_lock(&binder_deferred_lock);
3029                 if (!hlist_empty(&binder_deferred_list)) {
3030                         proc = hlist_entry(binder_deferred_list.first,
3031                                         struct binder_proc, deferred_work_node);
3032                         hlist_del_init(&proc->deferred_work_node);
3033                         defer = proc->deferred_work;
3034                         proc->deferred_work = 0;
3035                 } else {
3036                         proc = NULL;
3037                         defer = 0;
3038                 }
3039                 mutex_unlock(&binder_deferred_lock);
3040
3041                 files = NULL;
3042                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3043                         files = proc->files;
3044                         if (files)
3045                                 proc->files = NULL;
3046                 }
3047
3048                 if (defer & BINDER_DEFERRED_FLUSH)
3049                         binder_deferred_flush(proc);
3050
3051                 if (defer & BINDER_DEFERRED_RELEASE)
3052                         binder_deferred_release(proc); /* frees proc */
3053
3054                 mutex_unlock(&binder_lock);
3055                 if (files)
3056                         put_files_struct(files);
3057         } while (proc);
3058 }
3059 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3060
3061 static void
3062 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3063 {
3064         mutex_lock(&binder_deferred_lock);
3065         proc->deferred_work |= defer;
3066         if (hlist_unhashed(&proc->deferred_work_node)) {
3067                 hlist_add_head(&proc->deferred_work_node,
3068                                 &binder_deferred_list);
3069                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3070         }
3071         mutex_unlock(&binder_deferred_lock);
3072 }
3073
3074 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3075                                      struct binder_transaction *t)
3076 {
3077         seq_printf(m,
3078                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3079                    prefix, t->debug_id, t,
3080                    t->from ? t->from->proc->pid : 0,
3081                    t->from ? t->from->pid : 0,
3082                    t->to_proc ? t->to_proc->pid : 0,
3083                    t->to_thread ? t->to_thread->pid : 0,
3084                    t->code, t->flags, t->priority, t->need_reply);
3085         if (t->buffer == NULL) {
3086                 seq_puts(m, " buffer free\n");
3087                 return;
3088         }
3089         if (t->buffer->target_node)
3090                 seq_printf(m, " node %d",
3091                            t->buffer->target_node->debug_id);
3092         seq_printf(m, " size %zd:%zd data %p\n",
3093                    t->buffer->data_size, t->buffer->offsets_size,
3094                    t->buffer->data);
3095 }
3096
3097 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3098                                 struct binder_buffer *buffer)
3099 {
3100         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3101                    prefix, buffer->debug_id, buffer->data,
3102                    buffer->data_size, buffer->offsets_size,
3103                    buffer->transaction ? "active" : "delivered");
3104 }
3105
3106 static void print_binder_work(struct seq_file *m, const char *prefix,
3107                               const char *transaction_prefix,
3108                               struct binder_work *w)
3109 {
3110         struct binder_node *node;
3111         struct binder_transaction *t;
3112
3113         switch (w->type) {
3114         case BINDER_WORK_TRANSACTION:
3115                 t = container_of(w, struct binder_transaction, work);
3116                 print_binder_transaction(m, transaction_prefix, t);
3117                 break;
3118         case BINDER_WORK_TRANSACTION_COMPLETE:
3119                 seq_printf(m, "%stransaction complete\n", prefix);
3120                 break;
3121         case BINDER_WORK_NODE:
3122                 node = container_of(w, struct binder_node, work);
3123                 seq_printf(m, "%snode work %d: u%p c%p\n",
3124                            prefix, node->debug_id, node->ptr, node->cookie);
3125                 break;
3126         case BINDER_WORK_DEAD_BINDER:
3127                 seq_printf(m, "%shas dead binder\n", prefix);
3128                 break;
3129         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3130                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3131                 break;
3132         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3133                 seq_printf(m, "%shas cleared death notification\n", prefix);
3134                 break;
3135         default:
3136                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3137                 break;
3138         }
3139 }
3140
3141 static void print_binder_thread(struct seq_file *m,
3142                                 struct binder_thread *thread,
3143                                 int print_always)
3144 {
3145         struct binder_transaction *t;
3146         struct binder_work *w;
3147         size_t start_pos = m->count;
3148         size_t header_pos;
3149
3150         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3151         header_pos = m->count;
3152         t = thread->transaction_stack;
3153         while (t) {
3154                 if (t->from == thread) {
3155                         print_binder_transaction(m,
3156                                                  "    outgoing transaction", t);
3157                         t = t->from_parent;
3158                 } else if (t->to_thread == thread) {
3159                         print_binder_transaction(m,
3160                                                  "    incoming transaction", t);
3161                         t = t->to_parent;
3162                 } else {
3163                         print_binder_transaction(m, "    bad transaction", t);
3164                         t = NULL;
3165                 }
3166         }
3167         list_for_each_entry(w, &thread->todo, entry) {
3168                 print_binder_work(m, "    ", "    pending transaction", w);
3169         }
3170         if (!print_always && m->count == header_pos)
3171                 m->count = start_pos;
3172 }
3173
3174 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3175 {
3176         struct binder_ref *ref;
3177         struct hlist_node *pos;
3178         struct binder_work *w;
3179         int count;
3180
3181         count = 0;
3182         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3183                 count++;
3184
3185         seq_printf(m, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3186                    node->debug_id, node->ptr, node->cookie,
3187                    node->has_strong_ref, node->has_weak_ref,
3188                    node->local_strong_refs, node->local_weak_refs,
3189                    node->internal_strong_refs, count);
3190         if (count) {
3191                 seq_puts(m, " proc");
3192                 hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3193                         seq_printf(m, " %d", ref->proc->pid);
3194         }
3195         seq_puts(m, "\n");
3196         list_for_each_entry(w, &node->async_todo, entry)
3197                 print_binder_work(m, "    ",
3198                                   "    pending async transaction", w);
3199 }
3200
3201 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3202 {
3203         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3204                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3205                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3206 }
3207
3208 static void print_binder_proc(struct seq_file *m,
3209                               struct binder_proc *proc, int print_all)
3210 {
3211         struct binder_work *w;
3212         struct rb_node *n;
3213         size_t start_pos = m->count;
3214         size_t header_pos;
3215
3216         seq_printf(m, "proc %d\n", proc->pid);
3217         header_pos = m->count;
3218
3219         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3220                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3221                                                 rb_node), print_all);
3222         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3223                 struct binder_node *node = rb_entry(n, struct binder_node,
3224                                                     rb_node);
3225                 if (print_all || node->has_async_transaction)
3226                         print_binder_node(m, node);
3227         }
3228         if (print_all) {
3229                 for (n = rb_first(&proc->refs_by_desc);
3230                      n != NULL;
3231                      n = rb_next(n))
3232                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3233                                                      rb_node_desc));
3234         }
3235         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3236                 print_binder_buffer(m, "  buffer",
3237                                     rb_entry(n, struct binder_buffer, rb_node));
3238         list_for_each_entry(w, &proc->todo, entry)
3239                 print_binder_work(m, "  ", "  pending transaction", w);
3240         list_for_each_entry(w, &proc->delivered_death, entry) {
3241                 seq_puts(m, "  has delivered dead binder\n");
3242                 break;
3243         }
3244         if (!print_all && m->count == header_pos)
3245                 m->count = start_pos;
3246 }
3247
3248 static const char *binder_return_strings[] = {
3249         "BR_ERROR",
3250         "BR_OK",
3251         "BR_TRANSACTION",
3252         "BR_REPLY",
3253         "BR_ACQUIRE_RESULT",
3254         "BR_DEAD_REPLY",
3255         "BR_TRANSACTION_COMPLETE",
3256         "BR_INCREFS",
3257         "BR_ACQUIRE",
3258         "BR_RELEASE",
3259         "BR_DECREFS",
3260         "BR_ATTEMPT_ACQUIRE",
3261         "BR_NOOP",
3262         "BR_SPAWN_LOOPER",
3263         "BR_FINISHED",
3264         "BR_DEAD_BINDER",
3265         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3266         "BR_FAILED_REPLY"
3267 };
3268
3269 static const char *binder_command_strings[] = {
3270         "BC_TRANSACTION",
3271         "BC_REPLY",
3272         "BC_ACQUIRE_RESULT",
3273         "BC_FREE_BUFFER",
3274         "BC_INCREFS",
3275         "BC_ACQUIRE",
3276         "BC_RELEASE",
3277         "BC_DECREFS",
3278         "BC_INCREFS_DONE",
3279         "BC_ACQUIRE_DONE",
3280         "BC_ATTEMPT_ACQUIRE",
3281         "BC_REGISTER_LOOPER",
3282         "BC_ENTER_LOOPER",
3283         "BC_EXIT_LOOPER",
3284         "BC_REQUEST_DEATH_NOTIFICATION",
3285         "BC_CLEAR_DEATH_NOTIFICATION",
3286         "BC_DEAD_BINDER_DONE"
3287 };
3288
3289 static const char *binder_objstat_strings[] = {
3290         "proc",
3291         "thread",
3292         "node",
3293         "ref",
3294         "death",
3295         "transaction",
3296         "transaction_complete"
3297 };
3298
3299 static void print_binder_stats(struct seq_file *m, const char *prefix,
3300                                struct binder_stats *stats)
3301 {
3302         int i;
3303
3304         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3305                      ARRAY_SIZE(binder_command_strings));
3306         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3307                 if (stats->bc[i])
3308                         seq_printf(m, "%s%s: %d\n", prefix,
3309                                    binder_command_strings[i], stats->bc[i]);
3310         }
3311
3312         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3313                      ARRAY_SIZE(binder_return_strings));
3314         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3315                 if (stats->br[i])
3316                         seq_printf(m, "%s%s: %d\n", prefix,
3317                                    binder_return_strings[i], stats->br[i]);
3318         }
3319
3320         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3321                      ARRAY_SIZE(binder_objstat_strings));
3322         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3323                      ARRAY_SIZE(stats->obj_deleted));
3324         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3325                 if (stats->obj_created[i] || stats->obj_deleted[i])
3326                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3327                                 binder_objstat_strings[i],
3328                                 stats->obj_created[i] - stats->obj_deleted[i],
3329                                 stats->obj_created[i]);
3330         }
3331 }
3332
3333 static void print_binder_proc_stats(struct seq_file *m,
3334                                     struct binder_proc *proc)
3335 {
3336         struct binder_work *w;
3337         struct rb_node *n;
3338         int count, strong, weak;
3339
3340         seq_printf(m, "proc %d\n", proc->pid);
3341         count = 0;
3342         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3343                 count++;
3344         seq_printf(m, "  threads: %d\n", count);
3345         seq_printf(m, "  requested threads: %d+%d/%d\n"
3346                         "  ready threads %d\n"
3347                         "  free async space %zd\n", proc->requested_threads,
3348                         proc->requested_threads_started, proc->max_threads,
3349                         proc->ready_threads, proc->free_async_space);
3350         count = 0;
3351         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3352                 count++;
3353         seq_printf(m, "  nodes: %d\n", count);
3354         count = 0;
3355         strong = 0;
3356         weak = 0;
3357         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3358                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3359                                                   rb_node_desc);
3360                 count++;
3361                 strong += ref->strong;
3362                 weak += ref->weak;
3363         }
3364         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3365
3366         count = 0;
3367         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3368                 count++;
3369         seq_printf(m, "  buffers: %d\n", count);
3370
3371         count = 0;
3372         list_for_each_entry(w, &proc->todo, entry) {
3373                 switch (w->type) {
3374                 case BINDER_WORK_TRANSACTION:
3375                         count++;
3376                         break;
3377                 default:
3378                         break;
3379                 }
3380         }
3381         seq_printf(m, "  pending transactions: %d\n", count);
3382
3383         print_binder_stats(m, "  ", &proc->stats);
3384 }
3385
3386
3387 static int binder_state_show(struct seq_file *m, void *unused)
3388 {
3389         struct binder_proc *proc;
3390         struct hlist_node *pos;
3391         struct binder_node *node;
3392         int do_lock = !binder_debug_no_lock;
3393
3394         if (do_lock)
3395                 mutex_lock(&binder_lock);
3396
3397         seq_puts(m, "binder state:\n");
3398
3399         if (!hlist_empty(&binder_dead_nodes))
3400                 seq_puts(m, "dead nodes:\n");
3401         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node)
3402                 print_binder_node(m, node);
3403
3404         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3405                 print_binder_proc(m, proc, 1);
3406         if (do_lock)
3407                 mutex_unlock(&binder_lock);
3408         return 0;
3409 }
3410
3411 static int binder_stats_show(struct seq_file *m, void *unused)
3412 {
3413         struct binder_proc *proc;
3414         struct hlist_node *pos;
3415         int do_lock = !binder_debug_no_lock;
3416
3417         if (do_lock)
3418                 mutex_lock(&binder_lock);
3419
3420         seq_puts(m, "binder stats:\n");
3421
3422         print_binder_stats(m, "", &binder_stats);
3423
3424         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3425                 print_binder_proc_stats(m, proc);
3426         if (do_lock)
3427                 mutex_unlock(&binder_lock);
3428         return 0;
3429 }
3430
3431 static int binder_transactions_show(struct seq_file *m, void *unused)
3432 {
3433         struct binder_proc *proc;
3434         struct hlist_node *pos;
3435         int do_lock = !binder_debug_no_lock;
3436
3437         if (do_lock)
3438                 mutex_lock(&binder_lock);
3439
3440         seq_puts(m, "binder transactions:\n");
3441         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3442                 print_binder_proc(m, proc, 0);
3443         if (do_lock)
3444                 mutex_unlock(&binder_lock);
3445         return 0;
3446 }
3447
3448 static int binder_proc_show(struct seq_file *m, void *unused)
3449 {
3450         struct binder_proc *proc = m->private;
3451         int do_lock = !binder_debug_no_lock;
3452
3453         if (do_lock)
3454                 mutex_lock(&binder_lock);
3455         seq_puts(m, "binder proc state:\n");
3456         print_binder_proc(m, proc, 1);
3457         if (do_lock)
3458                 mutex_unlock(&binder_lock);
3459         return 0;
3460 }
3461
3462 static void print_binder_transaction_log_entry(struct seq_file *m,
3463                                         struct binder_transaction_log_entry *e)
3464 {
3465         seq_printf(m,
3466                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3467                    e->debug_id, (e->call_type == 2) ? "reply" :
3468                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3469                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3470                    e->target_handle, e->data_size, e->offsets_size);
3471 }
3472
3473 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3474 {
3475         struct binder_transaction_log *log = m->private;
3476         int i;
3477
3478         if (log->full) {
3479                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3480                         print_binder_transaction_log_entry(m, &log->entry[i]);
3481         }
3482         for (i = 0; i < log->next; i++)
3483                 print_binder_transaction_log_entry(m, &log->entry[i]);
3484         return 0;
3485 }
3486
3487 static const struct file_operations binder_fops = {
3488         .owner = THIS_MODULE,
3489         .poll = binder_poll,
3490         .unlocked_ioctl = binder_ioctl,
3491         .mmap = binder_mmap,
3492         .open = binder_open,
3493         .flush = binder_flush,
3494         .release = binder_release,
3495 };
3496
3497 static struct miscdevice binder_miscdev = {
3498         .minor = MISC_DYNAMIC_MINOR,
3499         .name = "binder",
3500         .fops = &binder_fops
3501 };
3502
3503 BINDER_DEBUG_ENTRY(state);
3504 BINDER_DEBUG_ENTRY(stats);
3505 BINDER_DEBUG_ENTRY(transactions);
3506 BINDER_DEBUG_ENTRY(transaction_log);
3507
3508 static int __init binder_init(void)
3509 {
3510         int ret;
3511
3512         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3513         if (!binder_deferred_workqueue)
3514                 return -ENOMEM;
3515
3516         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3517         if (binder_debugfs_dir_entry_root)
3518                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3519                                                  binder_debugfs_dir_entry_root);
3520         ret = misc_register(&binder_miscdev);
3521         if (binder_debugfs_dir_entry_root) {
3522                 debugfs_create_file("state",
3523                                     S_IRUGO,
3524                                     binder_debugfs_dir_entry_root,
3525                                     NULL,
3526                                     &binder_state_fops);
3527                 debugfs_create_file("stats",
3528                                     S_IRUGO,
3529                                     binder_debugfs_dir_entry_root,
3530                                     NULL,
3531                                     &binder_stats_fops);
3532                 debugfs_create_file("transactions",
3533                                     S_IRUGO,
3534                                     binder_debugfs_dir_entry_root,
3535                                     NULL,
3536                                     &binder_transactions_fops);
3537                 debugfs_create_file("transaction_log",
3538                                     S_IRUGO,
3539                                     binder_debugfs_dir_entry_root,
3540                                     &binder_transaction_log,
3541                                     &binder_transaction_log_fops);
3542                 debugfs_create_file("failed_transaction_log",
3543                                     S_IRUGO,
3544                                     binder_debugfs_dir_entry_root,
3545                                     &binder_transaction_log_failed,
3546                                     &binder_transaction_log_fops);
3547         }
3548         return ret;
3549 }
3550
3551 device_initcall(binder_init);
3552
3553 MODULE_LICENSE("GPL v2");