Merge branch 'for-3.8/drivers' of git://git.kernel.dk/linux-block
[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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <asm/cacheflush.h>
21 #include <linux/fdtable.h>
22 #include <linux/file.h>
23 #include <linux/fs.h>
24 #include <linux/list.h>
25 #include <linux/miscdevice.h>
26 #include <linux/mm.h>
27 #include <linux/module.h>
28 #include <linux/mutex.h>
29 #include <linux/nsproxy.h>
30 #include <linux/poll.h>
31 #include <linux/debugfs.h>
32 #include <linux/rbtree.h>
33 #include <linux/sched.h>
34 #include <linux/seq_file.h>
35 #include <linux/uaccess.h>
36 #include <linux/vmalloc.h>
37 #include <linux/slab.h>
38
39 #include "binder.h"
40 #include "binder_trace.h"
41
42 static DEFINE_MUTEX(binder_main_lock);
43 static DEFINE_MUTEX(binder_deferred_lock);
44 static DEFINE_MUTEX(binder_mmap_lock);
45
46 static HLIST_HEAD(binder_procs);
47 static HLIST_HEAD(binder_deferred_list);
48 static HLIST_HEAD(binder_dead_nodes);
49
50 static struct dentry *binder_debugfs_dir_entry_root;
51 static struct dentry *binder_debugfs_dir_entry_proc;
52 static struct binder_node *binder_context_mgr_node;
53 static kuid_t binder_context_mgr_uid = INVALID_UID;
54 static int binder_last_id;
55 static struct workqueue_struct *binder_deferred_workqueue;
56
57 #define BINDER_DEBUG_ENTRY(name) \
58 static int binder_##name##_open(struct inode *inode, struct file *file) \
59 { \
60         return single_open(file, binder_##name##_show, inode->i_private); \
61 } \
62 \
63 static const struct file_operations binder_##name##_fops = { \
64         .owner = THIS_MODULE, \
65         .open = binder_##name##_open, \
66         .read = seq_read, \
67         .llseek = seq_lseek, \
68         .release = single_release, \
69 }
70
71 static int binder_proc_show(struct seq_file *m, void *unused);
72 BINDER_DEBUG_ENTRY(proc);
73
74 /* This is only defined in include/asm-arm/sizes.h */
75 #ifndef SZ_1K
76 #define SZ_1K                               0x400
77 #endif
78
79 #ifndef SZ_4M
80 #define SZ_4M                               0x400000
81 #endif
82
83 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
84
85 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
86
87 enum {
88         BINDER_DEBUG_USER_ERROR             = 1U << 0,
89         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
90         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
91         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
92         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
93         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
94         BINDER_DEBUG_READ_WRITE             = 1U << 6,
95         BINDER_DEBUG_USER_REFS              = 1U << 7,
96         BINDER_DEBUG_THREADS                = 1U << 8,
97         BINDER_DEBUG_TRANSACTION            = 1U << 9,
98         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
99         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
100         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
101         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
102         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
103         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
104 };
105 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
106         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
107 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
108
109 static bool binder_debug_no_lock;
110 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
111
112 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
113 static int binder_stop_on_user_error;
114
115 static int binder_set_stop_on_user_error(const char *val,
116                                          struct kernel_param *kp)
117 {
118         int ret;
119         ret = param_set_int(val, kp);
120         if (binder_stop_on_user_error < 2)
121                 wake_up(&binder_user_error_wait);
122         return ret;
123 }
124 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
125         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
126
127 #define binder_debug(mask, x...) \
128         do { \
129                 if (binder_debug_mask & mask) \
130                         pr_info(x); \
131         } while (0)
132
133 #define binder_user_error(x...) \
134         do { \
135                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
136                         pr_info(x); \
137                 if (binder_stop_on_user_error) \
138                         binder_stop_on_user_error = 2; \
139         } while (0)
140
141 enum binder_stat_types {
142         BINDER_STAT_PROC,
143         BINDER_STAT_THREAD,
144         BINDER_STAT_NODE,
145         BINDER_STAT_REF,
146         BINDER_STAT_DEATH,
147         BINDER_STAT_TRANSACTION,
148         BINDER_STAT_TRANSACTION_COMPLETE,
149         BINDER_STAT_COUNT
150 };
151
152 struct binder_stats {
153         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
154         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
155         int obj_created[BINDER_STAT_COUNT];
156         int obj_deleted[BINDER_STAT_COUNT];
157 };
158
159 static struct binder_stats binder_stats;
160
161 static inline void binder_stats_deleted(enum binder_stat_types type)
162 {
163         binder_stats.obj_deleted[type]++;
164 }
165
166 static inline void binder_stats_created(enum binder_stat_types type)
167 {
168         binder_stats.obj_created[type]++;
169 }
170
171 struct binder_transaction_log_entry {
172         int debug_id;
173         int call_type;
174         int from_proc;
175         int from_thread;
176         int target_handle;
177         int to_proc;
178         int to_thread;
179         int to_node;
180         int data_size;
181         int offsets_size;
182 };
183 struct binder_transaction_log {
184         int next;
185         int full;
186         struct binder_transaction_log_entry entry[32];
187 };
188 static struct binder_transaction_log binder_transaction_log;
189 static struct binder_transaction_log binder_transaction_log_failed;
190
191 static struct binder_transaction_log_entry *binder_transaction_log_add(
192         struct binder_transaction_log *log)
193 {
194         struct binder_transaction_log_entry *e;
195         e = &log->entry[log->next];
196         memset(e, 0, sizeof(*e));
197         log->next++;
198         if (log->next == ARRAY_SIZE(log->entry)) {
199                 log->next = 0;
200                 log->full = 1;
201         }
202         return e;
203 }
204
205 struct binder_work {
206         struct list_head entry;
207         enum {
208                 BINDER_WORK_TRANSACTION = 1,
209                 BINDER_WORK_TRANSACTION_COMPLETE,
210                 BINDER_WORK_NODE,
211                 BINDER_WORK_DEAD_BINDER,
212                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
213                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
214         } type;
215 };
216
217 struct binder_node {
218         int debug_id;
219         struct binder_work work;
220         union {
221                 struct rb_node rb_node;
222                 struct hlist_node dead_node;
223         };
224         struct binder_proc *proc;
225         struct hlist_head refs;
226         int internal_strong_refs;
227         int local_weak_refs;
228         int local_strong_refs;
229         void __user *ptr;
230         void __user *cookie;
231         unsigned has_strong_ref:1;
232         unsigned pending_strong_ref:1;
233         unsigned has_weak_ref:1;
234         unsigned pending_weak_ref:1;
235         unsigned has_async_transaction:1;
236         unsigned accept_fds:1;
237         unsigned min_priority:8;
238         struct list_head async_todo;
239 };
240
241 struct binder_ref_death {
242         struct binder_work work;
243         void __user *cookie;
244 };
245
246 struct binder_ref {
247         /* Lookups needed: */
248         /*   node + proc => ref (transaction) */
249         /*   desc + proc => ref (transaction, inc/dec ref) */
250         /*   node => refs + procs (proc exit) */
251         int debug_id;
252         struct rb_node rb_node_desc;
253         struct rb_node rb_node_node;
254         struct hlist_node node_entry;
255         struct binder_proc *proc;
256         struct binder_node *node;
257         uint32_t desc;
258         int strong;
259         int weak;
260         struct binder_ref_death *death;
261 };
262
263 struct binder_buffer {
264         struct list_head entry; /* free and allocated entries by address */
265         struct rb_node rb_node; /* free entry by size or allocated entry */
266                                 /* by address */
267         unsigned free:1;
268         unsigned allow_user_free:1;
269         unsigned async_transaction:1;
270         unsigned debug_id:29;
271
272         struct binder_transaction *transaction;
273
274         struct binder_node *target_node;
275         size_t data_size;
276         size_t offsets_size;
277         uint8_t data[0];
278 };
279
280 enum binder_deferred_state {
281         BINDER_DEFERRED_PUT_FILES    = 0x01,
282         BINDER_DEFERRED_FLUSH        = 0x02,
283         BINDER_DEFERRED_RELEASE      = 0x04,
284 };
285
286 struct binder_proc {
287         struct hlist_node proc_node;
288         struct rb_root threads;
289         struct rb_root nodes;
290         struct rb_root refs_by_desc;
291         struct rb_root refs_by_node;
292         int pid;
293         struct vm_area_struct *vma;
294         struct mm_struct *vma_vm_mm;
295         struct task_struct *tsk;
296         struct files_struct *files;
297         struct hlist_node deferred_work_node;
298         int deferred_work;
299         void *buffer;
300         ptrdiff_t user_buffer_offset;
301
302         struct list_head buffers;
303         struct rb_root free_buffers;
304         struct rb_root allocated_buffers;
305         size_t free_async_space;
306
307         struct page **pages;
308         size_t buffer_size;
309         uint32_t buffer_free;
310         struct list_head todo;
311         wait_queue_head_t wait;
312         struct binder_stats stats;
313         struct list_head delivered_death;
314         int max_threads;
315         int requested_threads;
316         int requested_threads_started;
317         int ready_threads;
318         long default_priority;
319         struct dentry *debugfs_entry;
320 };
321
322 enum {
323         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
324         BINDER_LOOPER_STATE_ENTERED     = 0x02,
325         BINDER_LOOPER_STATE_EXITED      = 0x04,
326         BINDER_LOOPER_STATE_INVALID     = 0x08,
327         BINDER_LOOPER_STATE_WAITING     = 0x10,
328         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
329 };
330
331 struct binder_thread {
332         struct binder_proc *proc;
333         struct rb_node rb_node;
334         int pid;
335         int looper;
336         struct binder_transaction *transaction_stack;
337         struct list_head todo;
338         uint32_t return_error; /* Write failed, return error code in read buf */
339         uint32_t return_error2; /* Write failed, return error code in read */
340                 /* buffer. Used when sending a reply to a dead process that */
341                 /* we are also waiting on */
342         wait_queue_head_t wait;
343         struct binder_stats stats;
344 };
345
346 struct binder_transaction {
347         int debug_id;
348         struct binder_work work;
349         struct binder_thread *from;
350         struct binder_transaction *from_parent;
351         struct binder_proc *to_proc;
352         struct binder_thread *to_thread;
353         struct binder_transaction *to_parent;
354         unsigned need_reply:1;
355         /* unsigned is_dead:1; */       /* not used at the moment */
356
357         struct binder_buffer *buffer;
358         unsigned int    code;
359         unsigned int    flags;
360         long    priority;
361         long    saved_priority;
362         kuid_t  sender_euid;
363 };
364
365 static void
366 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
367
368 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
369 {
370         struct files_struct *files = proc->files;
371         unsigned long rlim_cur;
372         unsigned long irqs;
373
374         if (files == NULL)
375                 return -ESRCH;
376
377         if (!lock_task_sighand(proc->tsk, &irqs))
378                 return -EMFILE;
379
380         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
381         unlock_task_sighand(proc->tsk, &irqs);
382
383         return __alloc_fd(files, 0, rlim_cur, flags);
384 }
385
386 /*
387  * copied from fd_install
388  */
389 static void task_fd_install(
390         struct binder_proc *proc, unsigned int fd, struct file *file)
391 {
392         if (proc->files)
393                 __fd_install(proc->files, fd, file);
394 }
395
396 /*
397  * copied from sys_close
398  */
399 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
400 {
401         int retval;
402
403         if (proc->files == NULL)
404                 return -ESRCH;
405
406         retval = __close_fd(proc->files, fd);
407         /* can't restart close syscall because file table entry was cleared */
408         if (unlikely(retval == -ERESTARTSYS ||
409                      retval == -ERESTARTNOINTR ||
410                      retval == -ERESTARTNOHAND ||
411                      retval == -ERESTART_RESTARTBLOCK))
412                 retval = -EINTR;
413
414         return retval;
415 }
416
417 static inline void binder_lock(const char *tag)
418 {
419         trace_binder_lock(tag);
420         mutex_lock(&binder_main_lock);
421         trace_binder_locked(tag);
422 }
423
424 static inline void binder_unlock(const char *tag)
425 {
426         trace_binder_unlock(tag);
427         mutex_unlock(&binder_main_lock);
428 }
429
430 static void binder_set_nice(long nice)
431 {
432         long min_nice;
433         if (can_nice(current, nice)) {
434                 set_user_nice(current, nice);
435                 return;
436         }
437         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
438         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
439                      "%d: nice value %ld not allowed use %ld instead\n",
440                       current->pid, nice, min_nice);
441         set_user_nice(current, min_nice);
442         if (min_nice < 20)
443                 return;
444         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
445 }
446
447 static size_t binder_buffer_size(struct binder_proc *proc,
448                                  struct binder_buffer *buffer)
449 {
450         if (list_is_last(&buffer->entry, &proc->buffers))
451                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
452         else
453                 return (size_t)list_entry(buffer->entry.next,
454                         struct binder_buffer, entry) - (size_t)buffer->data;
455 }
456
457 static void binder_insert_free_buffer(struct binder_proc *proc,
458                                       struct binder_buffer *new_buffer)
459 {
460         struct rb_node **p = &proc->free_buffers.rb_node;
461         struct rb_node *parent = NULL;
462         struct binder_buffer *buffer;
463         size_t buffer_size;
464         size_t new_buffer_size;
465
466         BUG_ON(!new_buffer->free);
467
468         new_buffer_size = binder_buffer_size(proc, new_buffer);
469
470         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
471                      "%d: add free buffer, size %zd, at %p\n",
472                       proc->pid, new_buffer_size, new_buffer);
473
474         while (*p) {
475                 parent = *p;
476                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
477                 BUG_ON(!buffer->free);
478
479                 buffer_size = binder_buffer_size(proc, buffer);
480
481                 if (new_buffer_size < buffer_size)
482                         p = &parent->rb_left;
483                 else
484                         p = &parent->rb_right;
485         }
486         rb_link_node(&new_buffer->rb_node, parent, p);
487         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
488 }
489
490 static void binder_insert_allocated_buffer(struct binder_proc *proc,
491                                            struct binder_buffer *new_buffer)
492 {
493         struct rb_node **p = &proc->allocated_buffers.rb_node;
494         struct rb_node *parent = NULL;
495         struct binder_buffer *buffer;
496
497         BUG_ON(new_buffer->free);
498
499         while (*p) {
500                 parent = *p;
501                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
502                 BUG_ON(buffer->free);
503
504                 if (new_buffer < buffer)
505                         p = &parent->rb_left;
506                 else if (new_buffer > buffer)
507                         p = &parent->rb_right;
508                 else
509                         BUG();
510         }
511         rb_link_node(&new_buffer->rb_node, parent, p);
512         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
513 }
514
515 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
516                                                   void __user *user_ptr)
517 {
518         struct rb_node *n = proc->allocated_buffers.rb_node;
519         struct binder_buffer *buffer;
520         struct binder_buffer *kern_ptr;
521
522         kern_ptr = user_ptr - proc->user_buffer_offset
523                 - offsetof(struct binder_buffer, data);
524
525         while (n) {
526                 buffer = rb_entry(n, struct binder_buffer, rb_node);
527                 BUG_ON(buffer->free);
528
529                 if (kern_ptr < buffer)
530                         n = n->rb_left;
531                 else if (kern_ptr > buffer)
532                         n = n->rb_right;
533                 else
534                         return buffer;
535         }
536         return NULL;
537 }
538
539 static int binder_update_page_range(struct binder_proc *proc, int allocate,
540                                     void *start, void *end,
541                                     struct vm_area_struct *vma)
542 {
543         void *page_addr;
544         unsigned long user_page_addr;
545         struct vm_struct tmp_area;
546         struct page **page;
547         struct mm_struct *mm;
548
549         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
550                      "%d: %s pages %p-%p\n", proc->pid,
551                      allocate ? "allocate" : "free", start, end);
552
553         if (end <= start)
554                 return 0;
555
556         trace_binder_update_page_range(proc, allocate, start, end);
557
558         if (vma)
559                 mm = NULL;
560         else
561                 mm = get_task_mm(proc->tsk);
562
563         if (mm) {
564                 down_write(&mm->mmap_sem);
565                 vma = proc->vma;
566                 if (vma && mm != proc->vma_vm_mm) {
567                         pr_err("%d: vma mm and task mm mismatch\n",
568                                 proc->pid);
569                         vma = NULL;
570                 }
571         }
572
573         if (allocate == 0)
574                 goto free_range;
575
576         if (vma == NULL) {
577                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
578                         proc->pid);
579                 goto err_no_vma;
580         }
581
582         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
583                 int ret;
584                 struct page **page_array_ptr;
585                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
586
587                 BUG_ON(*page);
588                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
589                 if (*page == NULL) {
590                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
591                                 proc->pid, page_addr);
592                         goto err_alloc_page_failed;
593                 }
594                 tmp_area.addr = page_addr;
595                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
596                 page_array_ptr = page;
597                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
598                 if (ret) {
599                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
600                                proc->pid, page_addr);
601                         goto err_map_kernel_failed;
602                 }
603                 user_page_addr =
604                         (uintptr_t)page_addr + proc->user_buffer_offset;
605                 ret = vm_insert_page(vma, user_page_addr, page[0]);
606                 if (ret) {
607                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
608                                proc->pid, user_page_addr);
609                         goto err_vm_insert_page_failed;
610                 }
611                 /* vm_insert_page does not seem to increment the refcount */
612         }
613         if (mm) {
614                 up_write(&mm->mmap_sem);
615                 mmput(mm);
616         }
617         return 0;
618
619 free_range:
620         for (page_addr = end - PAGE_SIZE; page_addr >= start;
621              page_addr -= PAGE_SIZE) {
622                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
623                 if (vma)
624                         zap_page_range(vma, (uintptr_t)page_addr +
625                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
626 err_vm_insert_page_failed:
627                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
628 err_map_kernel_failed:
629                 __free_page(*page);
630                 *page = NULL;
631 err_alloc_page_failed:
632                 ;
633         }
634 err_no_vma:
635         if (mm) {
636                 up_write(&mm->mmap_sem);
637                 mmput(mm);
638         }
639         return -ENOMEM;
640 }
641
642 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
643                                               size_t data_size,
644                                               size_t offsets_size, int is_async)
645 {
646         struct rb_node *n = proc->free_buffers.rb_node;
647         struct binder_buffer *buffer;
648         size_t buffer_size;
649         struct rb_node *best_fit = NULL;
650         void *has_page_addr;
651         void *end_page_addr;
652         size_t size;
653
654         if (proc->vma == NULL) {
655                 pr_err("%d: binder_alloc_buf, no vma\n",
656                        proc->pid);
657                 return NULL;
658         }
659
660         size = ALIGN(data_size, sizeof(void *)) +
661                 ALIGN(offsets_size, sizeof(void *));
662
663         if (size < data_size || size < offsets_size) {
664                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
665                                 proc->pid, data_size, offsets_size);
666                 return NULL;
667         }
668
669         if (is_async &&
670             proc->free_async_space < size + sizeof(struct binder_buffer)) {
671                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
672                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
673                               proc->pid, size);
674                 return NULL;
675         }
676
677         while (n) {
678                 buffer = rb_entry(n, struct binder_buffer, rb_node);
679                 BUG_ON(!buffer->free);
680                 buffer_size = binder_buffer_size(proc, buffer);
681
682                 if (size < buffer_size) {
683                         best_fit = n;
684                         n = n->rb_left;
685                 } else if (size > buffer_size)
686                         n = n->rb_right;
687                 else {
688                         best_fit = n;
689                         break;
690                 }
691         }
692         if (best_fit == NULL) {
693                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
694                         proc->pid, size);
695                 return NULL;
696         }
697         if (n == NULL) {
698                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
699                 buffer_size = binder_buffer_size(proc, buffer);
700         }
701
702         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
703                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
704                       proc->pid, size, buffer, buffer_size);
705
706         has_page_addr =
707                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
708         if (n == NULL) {
709                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
710                         buffer_size = size; /* no room for other buffers */
711                 else
712                         buffer_size = size + sizeof(struct binder_buffer);
713         }
714         end_page_addr =
715                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
716         if (end_page_addr > has_page_addr)
717                 end_page_addr = has_page_addr;
718         if (binder_update_page_range(proc, 1,
719             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
720                 return NULL;
721
722         rb_erase(best_fit, &proc->free_buffers);
723         buffer->free = 0;
724         binder_insert_allocated_buffer(proc, buffer);
725         if (buffer_size != size) {
726                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
727                 list_add(&new_buffer->entry, &buffer->entry);
728                 new_buffer->free = 1;
729                 binder_insert_free_buffer(proc, new_buffer);
730         }
731         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
732                      "%d: binder_alloc_buf size %zd got %p\n",
733                       proc->pid, size, buffer);
734         buffer->data_size = data_size;
735         buffer->offsets_size = offsets_size;
736         buffer->async_transaction = is_async;
737         if (is_async) {
738                 proc->free_async_space -= size + sizeof(struct binder_buffer);
739                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
740                              "%d: binder_alloc_buf size %zd async free %zd\n",
741                               proc->pid, size, proc->free_async_space);
742         }
743
744         return buffer;
745 }
746
747 static void *buffer_start_page(struct binder_buffer *buffer)
748 {
749         return (void *)((uintptr_t)buffer & PAGE_MASK);
750 }
751
752 static void *buffer_end_page(struct binder_buffer *buffer)
753 {
754         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
755 }
756
757 static void binder_delete_free_buffer(struct binder_proc *proc,
758                                       struct binder_buffer *buffer)
759 {
760         struct binder_buffer *prev, *next = NULL;
761         int free_page_end = 1;
762         int free_page_start = 1;
763
764         BUG_ON(proc->buffers.next == &buffer->entry);
765         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
766         BUG_ON(!prev->free);
767         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
768                 free_page_start = 0;
769                 if (buffer_end_page(prev) == buffer_end_page(buffer))
770                         free_page_end = 0;
771                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
772                              "%d: merge free, buffer %p share page with %p\n",
773                               proc->pid, buffer, prev);
774         }
775
776         if (!list_is_last(&buffer->entry, &proc->buffers)) {
777                 next = list_entry(buffer->entry.next,
778                                   struct binder_buffer, entry);
779                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
780                         free_page_end = 0;
781                         if (buffer_start_page(next) ==
782                             buffer_start_page(buffer))
783                                 free_page_start = 0;
784                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
785                                      "%d: merge free, buffer %p share page with %p\n",
786                                       proc->pid, buffer, prev);
787                 }
788         }
789         list_del(&buffer->entry);
790         if (free_page_start || free_page_end) {
791                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
792                              "%d: merge free, buffer %p do not share page%s%s with with %p or %p\n",
793                              proc->pid, buffer, free_page_start ? "" : " end",
794                              free_page_end ? "" : " start", prev, next);
795                 binder_update_page_range(proc, 0, free_page_start ?
796                         buffer_start_page(buffer) : buffer_end_page(buffer),
797                         (free_page_end ? buffer_end_page(buffer) :
798                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
799         }
800 }
801
802 static void binder_free_buf(struct binder_proc *proc,
803                             struct binder_buffer *buffer)
804 {
805         size_t size, buffer_size;
806
807         buffer_size = binder_buffer_size(proc, buffer);
808
809         size = ALIGN(buffer->data_size, sizeof(void *)) +
810                 ALIGN(buffer->offsets_size, sizeof(void *));
811
812         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
813                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
814                       proc->pid, buffer, size, buffer_size);
815
816         BUG_ON(buffer->free);
817         BUG_ON(size > buffer_size);
818         BUG_ON(buffer->transaction != NULL);
819         BUG_ON((void *)buffer < proc->buffer);
820         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
821
822         if (buffer->async_transaction) {
823                 proc->free_async_space += size + sizeof(struct binder_buffer);
824
825                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
826                              "%d: binder_free_buf size %zd async free %zd\n",
827                               proc->pid, size, proc->free_async_space);
828         }
829
830         binder_update_page_range(proc, 0,
831                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
832                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
833                 NULL);
834         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
835         buffer->free = 1;
836         if (!list_is_last(&buffer->entry, &proc->buffers)) {
837                 struct binder_buffer *next = list_entry(buffer->entry.next,
838                                                 struct binder_buffer, entry);
839                 if (next->free) {
840                         rb_erase(&next->rb_node, &proc->free_buffers);
841                         binder_delete_free_buffer(proc, next);
842                 }
843         }
844         if (proc->buffers.next != &buffer->entry) {
845                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
846                                                 struct binder_buffer, entry);
847                 if (prev->free) {
848                         binder_delete_free_buffer(proc, buffer);
849                         rb_erase(&prev->rb_node, &proc->free_buffers);
850                         buffer = prev;
851                 }
852         }
853         binder_insert_free_buffer(proc, buffer);
854 }
855
856 static struct binder_node *binder_get_node(struct binder_proc *proc,
857                                            void __user *ptr)
858 {
859         struct rb_node *n = proc->nodes.rb_node;
860         struct binder_node *node;
861
862         while (n) {
863                 node = rb_entry(n, struct binder_node, rb_node);
864
865                 if (ptr < node->ptr)
866                         n = n->rb_left;
867                 else if (ptr > node->ptr)
868                         n = n->rb_right;
869                 else
870                         return node;
871         }
872         return NULL;
873 }
874
875 static struct binder_node *binder_new_node(struct binder_proc *proc,
876                                            void __user *ptr,
877                                            void __user *cookie)
878 {
879         struct rb_node **p = &proc->nodes.rb_node;
880         struct rb_node *parent = NULL;
881         struct binder_node *node;
882
883         while (*p) {
884                 parent = *p;
885                 node = rb_entry(parent, struct binder_node, rb_node);
886
887                 if (ptr < node->ptr)
888                         p = &(*p)->rb_left;
889                 else if (ptr > node->ptr)
890                         p = &(*p)->rb_right;
891                 else
892                         return NULL;
893         }
894
895         node = kzalloc(sizeof(*node), GFP_KERNEL);
896         if (node == NULL)
897                 return NULL;
898         binder_stats_created(BINDER_STAT_NODE);
899         rb_link_node(&node->rb_node, parent, p);
900         rb_insert_color(&node->rb_node, &proc->nodes);
901         node->debug_id = ++binder_last_id;
902         node->proc = proc;
903         node->ptr = ptr;
904         node->cookie = cookie;
905         node->work.type = BINDER_WORK_NODE;
906         INIT_LIST_HEAD(&node->work.entry);
907         INIT_LIST_HEAD(&node->async_todo);
908         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
909                      "%d:%d node %d u%p c%p created\n",
910                      proc->pid, current->pid, node->debug_id,
911                      node->ptr, node->cookie);
912         return node;
913 }
914
915 static int binder_inc_node(struct binder_node *node, int strong, int internal,
916                            struct list_head *target_list)
917 {
918         if (strong) {
919                 if (internal) {
920                         if (target_list == NULL &&
921                             node->internal_strong_refs == 0 &&
922                             !(node == binder_context_mgr_node &&
923                             node->has_strong_ref)) {
924                                 pr_err("invalid inc strong node for %d\n",
925                                         node->debug_id);
926                                 return -EINVAL;
927                         }
928                         node->internal_strong_refs++;
929                 } else
930                         node->local_strong_refs++;
931                 if (!node->has_strong_ref && target_list) {
932                         list_del_init(&node->work.entry);
933                         list_add_tail(&node->work.entry, target_list);
934                 }
935         } else {
936                 if (!internal)
937                         node->local_weak_refs++;
938                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
939                         if (target_list == NULL) {
940                                 pr_err("invalid inc weak node for %d\n",
941                                         node->debug_id);
942                                 return -EINVAL;
943                         }
944                         list_add_tail(&node->work.entry, target_list);
945                 }
946         }
947         return 0;
948 }
949
950 static int binder_dec_node(struct binder_node *node, int strong, int internal)
951 {
952         if (strong) {
953                 if (internal)
954                         node->internal_strong_refs--;
955                 else
956                         node->local_strong_refs--;
957                 if (node->local_strong_refs || node->internal_strong_refs)
958                         return 0;
959         } else {
960                 if (!internal)
961                         node->local_weak_refs--;
962                 if (node->local_weak_refs || !hlist_empty(&node->refs))
963                         return 0;
964         }
965         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
966                 if (list_empty(&node->work.entry)) {
967                         list_add_tail(&node->work.entry, &node->proc->todo);
968                         wake_up_interruptible(&node->proc->wait);
969                 }
970         } else {
971                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
972                     !node->local_weak_refs) {
973                         list_del_init(&node->work.entry);
974                         if (node->proc) {
975                                 rb_erase(&node->rb_node, &node->proc->nodes);
976                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
977                                              "refless node %d deleted\n",
978                                              node->debug_id);
979                         } else {
980                                 hlist_del(&node->dead_node);
981                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
982                                              "dead node %d deleted\n",
983                                              node->debug_id);
984                         }
985                         kfree(node);
986                         binder_stats_deleted(BINDER_STAT_NODE);
987                 }
988         }
989
990         return 0;
991 }
992
993
994 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
995                                          uint32_t desc)
996 {
997         struct rb_node *n = proc->refs_by_desc.rb_node;
998         struct binder_ref *ref;
999
1000         while (n) {
1001                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1002
1003                 if (desc < ref->desc)
1004                         n = n->rb_left;
1005                 else if (desc > ref->desc)
1006                         n = n->rb_right;
1007                 else
1008                         return ref;
1009         }
1010         return NULL;
1011 }
1012
1013 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1014                                                   struct binder_node *node)
1015 {
1016         struct rb_node *n;
1017         struct rb_node **p = &proc->refs_by_node.rb_node;
1018         struct rb_node *parent = NULL;
1019         struct binder_ref *ref, *new_ref;
1020
1021         while (*p) {
1022                 parent = *p;
1023                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1024
1025                 if (node < ref->node)
1026                         p = &(*p)->rb_left;
1027                 else if (node > ref->node)
1028                         p = &(*p)->rb_right;
1029                 else
1030                         return ref;
1031         }
1032         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1033         if (new_ref == NULL)
1034                 return NULL;
1035         binder_stats_created(BINDER_STAT_REF);
1036         new_ref->debug_id = ++binder_last_id;
1037         new_ref->proc = proc;
1038         new_ref->node = node;
1039         rb_link_node(&new_ref->rb_node_node, parent, p);
1040         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1041
1042         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1043         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1044                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1045                 if (ref->desc > new_ref->desc)
1046                         break;
1047                 new_ref->desc = ref->desc + 1;
1048         }
1049
1050         p = &proc->refs_by_desc.rb_node;
1051         while (*p) {
1052                 parent = *p;
1053                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1054
1055                 if (new_ref->desc < ref->desc)
1056                         p = &(*p)->rb_left;
1057                 else if (new_ref->desc > ref->desc)
1058                         p = &(*p)->rb_right;
1059                 else
1060                         BUG();
1061         }
1062         rb_link_node(&new_ref->rb_node_desc, parent, p);
1063         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1064         if (node) {
1065                 hlist_add_head(&new_ref->node_entry, &node->refs);
1066
1067                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1068                              "%d new ref %d desc %d for node %d\n",
1069                               proc->pid, new_ref->debug_id, new_ref->desc,
1070                               node->debug_id);
1071         } else {
1072                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1073                              "%d new ref %d desc %d for dead node\n",
1074                               proc->pid, new_ref->debug_id, new_ref->desc);
1075         }
1076         return new_ref;
1077 }
1078
1079 static void binder_delete_ref(struct binder_ref *ref)
1080 {
1081         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1082                      "%d delete ref %d desc %d for node %d\n",
1083                       ref->proc->pid, ref->debug_id, ref->desc,
1084                       ref->node->debug_id);
1085
1086         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1087         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1088         if (ref->strong)
1089                 binder_dec_node(ref->node, 1, 1);
1090         hlist_del(&ref->node_entry);
1091         binder_dec_node(ref->node, 0, 1);
1092         if (ref->death) {
1093                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1094                              "%d delete ref %d desc %d has death notification\n",
1095                               ref->proc->pid, ref->debug_id, ref->desc);
1096                 list_del(&ref->death->work.entry);
1097                 kfree(ref->death);
1098                 binder_stats_deleted(BINDER_STAT_DEATH);
1099         }
1100         kfree(ref);
1101         binder_stats_deleted(BINDER_STAT_REF);
1102 }
1103
1104 static int binder_inc_ref(struct binder_ref *ref, int strong,
1105                           struct list_head *target_list)
1106 {
1107         int ret;
1108         if (strong) {
1109                 if (ref->strong == 0) {
1110                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1111                         if (ret)
1112                                 return ret;
1113                 }
1114                 ref->strong++;
1115         } else {
1116                 if (ref->weak == 0) {
1117                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1118                         if (ret)
1119                                 return ret;
1120                 }
1121                 ref->weak++;
1122         }
1123         return 0;
1124 }
1125
1126
1127 static int binder_dec_ref(struct binder_ref *ref, int strong)
1128 {
1129         if (strong) {
1130                 if (ref->strong == 0) {
1131                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1132                                           ref->proc->pid, ref->debug_id,
1133                                           ref->desc, ref->strong, ref->weak);
1134                         return -EINVAL;
1135                 }
1136                 ref->strong--;
1137                 if (ref->strong == 0) {
1138                         int ret;
1139                         ret = binder_dec_node(ref->node, strong, 1);
1140                         if (ret)
1141                                 return ret;
1142                 }
1143         } else {
1144                 if (ref->weak == 0) {
1145                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1146                                           ref->proc->pid, ref->debug_id,
1147                                           ref->desc, ref->strong, ref->weak);
1148                         return -EINVAL;
1149                 }
1150                 ref->weak--;
1151         }
1152         if (ref->strong == 0 && ref->weak == 0)
1153                 binder_delete_ref(ref);
1154         return 0;
1155 }
1156
1157 static void binder_pop_transaction(struct binder_thread *target_thread,
1158                                    struct binder_transaction *t)
1159 {
1160         if (target_thread) {
1161                 BUG_ON(target_thread->transaction_stack != t);
1162                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1163                 target_thread->transaction_stack =
1164                         target_thread->transaction_stack->from_parent;
1165                 t->from = NULL;
1166         }
1167         t->need_reply = 0;
1168         if (t->buffer)
1169                 t->buffer->transaction = NULL;
1170         kfree(t);
1171         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1172 }
1173
1174 static void binder_send_failed_reply(struct binder_transaction *t,
1175                                      uint32_t error_code)
1176 {
1177         struct binder_thread *target_thread;
1178         BUG_ON(t->flags & TF_ONE_WAY);
1179         while (1) {
1180                 target_thread = t->from;
1181                 if (target_thread) {
1182                         if (target_thread->return_error != BR_OK &&
1183                            target_thread->return_error2 == BR_OK) {
1184                                 target_thread->return_error2 =
1185                                         target_thread->return_error;
1186                                 target_thread->return_error = BR_OK;
1187                         }
1188                         if (target_thread->return_error == BR_OK) {
1189                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1190                                              "send failed reply for transaction %d to %d:%d\n",
1191                                               t->debug_id, target_thread->proc->pid,
1192                                               target_thread->pid);
1193
1194                                 binder_pop_transaction(target_thread, t);
1195                                 target_thread->return_error = error_code;
1196                                 wake_up_interruptible(&target_thread->wait);
1197                         } else {
1198                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1199                                         target_thread->proc->pid,
1200                                         target_thread->pid,
1201                                         target_thread->return_error);
1202                         }
1203                         return;
1204                 } else {
1205                         struct binder_transaction *next = t->from_parent;
1206
1207                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1208                                      "send failed reply for transaction %d, target dead\n",
1209                                      t->debug_id);
1210
1211                         binder_pop_transaction(target_thread, t);
1212                         if (next == NULL) {
1213                                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1214                                              "reply failed, no target thread at root\n");
1215                                 return;
1216                         }
1217                         t = next;
1218                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1219                                      "reply failed, no target thread -- retry %d\n",
1220                                       t->debug_id);
1221                 }
1222         }
1223 }
1224
1225 static void binder_transaction_buffer_release(struct binder_proc *proc,
1226                                               struct binder_buffer *buffer,
1227                                               size_t *failed_at)
1228 {
1229         size_t *offp, *off_end;
1230         int debug_id = buffer->debug_id;
1231
1232         binder_debug(BINDER_DEBUG_TRANSACTION,
1233                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1234                      proc->pid, buffer->debug_id,
1235                      buffer->data_size, buffer->offsets_size, failed_at);
1236
1237         if (buffer->target_node)
1238                 binder_dec_node(buffer->target_node, 1, 0);
1239
1240         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1241         if (failed_at)
1242                 off_end = failed_at;
1243         else
1244                 off_end = (void *)offp + buffer->offsets_size;
1245         for (; offp < off_end; offp++) {
1246                 struct flat_binder_object *fp;
1247                 if (*offp > buffer->data_size - sizeof(*fp) ||
1248                     buffer->data_size < sizeof(*fp) ||
1249                     !IS_ALIGNED(*offp, sizeof(void *))) {
1250                         pr_err("transaction release %d bad offset %zd, size %zd\n",
1251                          debug_id, *offp, buffer->data_size);
1252                         continue;
1253                 }
1254                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1255                 switch (fp->type) {
1256                 case BINDER_TYPE_BINDER:
1257                 case BINDER_TYPE_WEAK_BINDER: {
1258                         struct binder_node *node = binder_get_node(proc, fp->binder);
1259                         if (node == NULL) {
1260                                 pr_err("transaction release %d bad node %p\n",
1261                                         debug_id, fp->binder);
1262                                 break;
1263                         }
1264                         binder_debug(BINDER_DEBUG_TRANSACTION,
1265                                      "        node %d u%p\n",
1266                                      node->debug_id, node->ptr);
1267                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1268                 } break;
1269                 case BINDER_TYPE_HANDLE:
1270                 case BINDER_TYPE_WEAK_HANDLE: {
1271                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1272                         if (ref == NULL) {
1273                                 pr_err("transaction release %d bad handle %ld\n",
1274                                  debug_id, fp->handle);
1275                                 break;
1276                         }
1277                         binder_debug(BINDER_DEBUG_TRANSACTION,
1278                                      "        ref %d desc %d (node %d)\n",
1279                                      ref->debug_id, ref->desc, ref->node->debug_id);
1280                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1281                 } break;
1282
1283                 case BINDER_TYPE_FD:
1284                         binder_debug(BINDER_DEBUG_TRANSACTION,
1285                                      "        fd %ld\n", fp->handle);
1286                         if (failed_at)
1287                                 task_close_fd(proc, fp->handle);
1288                         break;
1289
1290                 default:
1291                         pr_err("transaction release %d bad object type %lx\n",
1292                                 debug_id, fp->type);
1293                         break;
1294                 }
1295         }
1296 }
1297
1298 static void binder_transaction(struct binder_proc *proc,
1299                                struct binder_thread *thread,
1300                                struct binder_transaction_data *tr, int reply)
1301 {
1302         struct binder_transaction *t;
1303         struct binder_work *tcomplete;
1304         size_t *offp, *off_end;
1305         struct binder_proc *target_proc;
1306         struct binder_thread *target_thread = NULL;
1307         struct binder_node *target_node = NULL;
1308         struct list_head *target_list;
1309         wait_queue_head_t *target_wait;
1310         struct binder_transaction *in_reply_to = NULL;
1311         struct binder_transaction_log_entry *e;
1312         uint32_t return_error;
1313
1314         e = binder_transaction_log_add(&binder_transaction_log);
1315         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1316         e->from_proc = proc->pid;
1317         e->from_thread = thread->pid;
1318         e->target_handle = tr->target.handle;
1319         e->data_size = tr->data_size;
1320         e->offsets_size = tr->offsets_size;
1321
1322         if (reply) {
1323                 in_reply_to = thread->transaction_stack;
1324                 if (in_reply_to == NULL) {
1325                         binder_user_error("%d:%d got reply transaction 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("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1333                                 proc->pid, thread->pid, in_reply_to->debug_id,
1334                                 in_reply_to->to_proc ?
1335                                 in_reply_to->to_proc->pid : 0,
1336                                 in_reply_to->to_thread ?
1337                                 in_reply_to->to_thread->pid : 0);
1338                         return_error = BR_FAILED_REPLY;
1339                         in_reply_to = NULL;
1340                         goto err_bad_call_stack;
1341                 }
1342                 thread->transaction_stack = in_reply_to->to_parent;
1343                 target_thread = in_reply_to->from;
1344                 if (target_thread == NULL) {
1345                         return_error = BR_DEAD_REPLY;
1346                         goto err_dead_binder;
1347                 }
1348                 if (target_thread->transaction_stack != in_reply_to) {
1349                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1350                                 proc->pid, thread->pid,
1351                                 target_thread->transaction_stack ?
1352                                 target_thread->transaction_stack->debug_id : 0,
1353                                 in_reply_to->debug_id);
1354                         return_error = BR_FAILED_REPLY;
1355                         in_reply_to = NULL;
1356                         target_thread = NULL;
1357                         goto err_dead_binder;
1358                 }
1359                 target_proc = target_thread->proc;
1360         } else {
1361                 if (tr->target.handle) {
1362                         struct binder_ref *ref;
1363                         ref = binder_get_ref(proc, tr->target.handle);
1364                         if (ref == NULL) {
1365                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1366                                         proc->pid, thread->pid);
1367                                 return_error = BR_FAILED_REPLY;
1368                                 goto err_invalid_target_handle;
1369                         }
1370                         target_node = ref->node;
1371                 } else {
1372                         target_node = binder_context_mgr_node;
1373                         if (target_node == NULL) {
1374                                 return_error = BR_DEAD_REPLY;
1375                                 goto err_no_context_mgr_node;
1376                         }
1377                 }
1378                 e->to_node = target_node->debug_id;
1379                 target_proc = target_node->proc;
1380                 if (target_proc == NULL) {
1381                         return_error = BR_DEAD_REPLY;
1382                         goto err_dead_binder;
1383                 }
1384                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1385                         struct binder_transaction *tmp;
1386                         tmp = thread->transaction_stack;
1387                         if (tmp->to_thread != thread) {
1388                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1389                                         proc->pid, thread->pid, tmp->debug_id,
1390                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1391                                         tmp->to_thread ?
1392                                         tmp->to_thread->pid : 0);
1393                                 return_error = BR_FAILED_REPLY;
1394                                 goto err_bad_call_stack;
1395                         }
1396                         while (tmp) {
1397                                 if (tmp->from && tmp->from->proc == target_proc)
1398                                         target_thread = tmp->from;
1399                                 tmp = tmp->from_parent;
1400                         }
1401                 }
1402         }
1403         if (target_thread) {
1404                 e->to_thread = target_thread->pid;
1405                 target_list = &target_thread->todo;
1406                 target_wait = &target_thread->wait;
1407         } else {
1408                 target_list = &target_proc->todo;
1409                 target_wait = &target_proc->wait;
1410         }
1411         e->to_proc = target_proc->pid;
1412
1413         /* TODO: reuse incoming transaction for reply */
1414         t = kzalloc(sizeof(*t), GFP_KERNEL);
1415         if (t == NULL) {
1416                 return_error = BR_FAILED_REPLY;
1417                 goto err_alloc_t_failed;
1418         }
1419         binder_stats_created(BINDER_STAT_TRANSACTION);
1420
1421         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1422         if (tcomplete == NULL) {
1423                 return_error = BR_FAILED_REPLY;
1424                 goto err_alloc_tcomplete_failed;
1425         }
1426         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1427
1428         t->debug_id = ++binder_last_id;
1429         e->debug_id = t->debug_id;
1430
1431         if (reply)
1432                 binder_debug(BINDER_DEBUG_TRANSACTION,
1433                              "%d:%d BC_REPLY %d -> %d:%d, data %p-%p size %zd-%zd\n",
1434                              proc->pid, thread->pid, t->debug_id,
1435                              target_proc->pid, target_thread->pid,
1436                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1437                              tr->data_size, tr->offsets_size);
1438         else
1439                 binder_debug(BINDER_DEBUG_TRANSACTION,
1440                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %p-%p size %zd-%zd\n",
1441                              proc->pid, thread->pid, t->debug_id,
1442                              target_proc->pid, target_node->debug_id,
1443                              tr->data.ptr.buffer, tr->data.ptr.offsets,
1444                              tr->data_size, tr->offsets_size);
1445
1446         if (!reply && !(tr->flags & TF_ONE_WAY))
1447                 t->from = thread;
1448         else
1449                 t->from = NULL;
1450         t->sender_euid = proc->tsk->cred->euid;
1451         t->to_proc = target_proc;
1452         t->to_thread = target_thread;
1453         t->code = tr->code;
1454         t->flags = tr->flags;
1455         t->priority = task_nice(current);
1456
1457         trace_binder_transaction(reply, t, target_node);
1458
1459         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1460                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1461         if (t->buffer == NULL) {
1462                 return_error = BR_FAILED_REPLY;
1463                 goto err_binder_alloc_buf_failed;
1464         }
1465         t->buffer->allow_user_free = 0;
1466         t->buffer->debug_id = t->debug_id;
1467         t->buffer->transaction = t;
1468         t->buffer->target_node = target_node;
1469         trace_binder_transaction_alloc_buf(t->buffer);
1470         if (target_node)
1471                 binder_inc_node(target_node, 1, 0, NULL);
1472
1473         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1474
1475         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1476                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1477                                 proc->pid, thread->pid);
1478                 return_error = BR_FAILED_REPLY;
1479                 goto err_copy_data_failed;
1480         }
1481         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1482                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1483                                 proc->pid, thread->pid);
1484                 return_error = BR_FAILED_REPLY;
1485                 goto err_copy_data_failed;
1486         }
1487         if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1488                 binder_user_error("%d:%d got transaction with invalid offsets size, %zd\n",
1489                                 proc->pid, thread->pid, tr->offsets_size);
1490                 return_error = BR_FAILED_REPLY;
1491                 goto err_bad_offset;
1492         }
1493         off_end = (void *)offp + tr->offsets_size;
1494         for (; offp < off_end; offp++) {
1495                 struct flat_binder_object *fp;
1496                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1497                     t->buffer->data_size < sizeof(*fp) ||
1498                     !IS_ALIGNED(*offp, sizeof(void *))) {
1499                         binder_user_error("%d:%d got transaction with invalid offset, %zd\n",
1500                                         proc->pid, thread->pid, *offp);
1501                         return_error = BR_FAILED_REPLY;
1502                         goto err_bad_offset;
1503                 }
1504                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1505                 switch (fp->type) {
1506                 case BINDER_TYPE_BINDER:
1507                 case BINDER_TYPE_WEAK_BINDER: {
1508                         struct binder_ref *ref;
1509                         struct binder_node *node = binder_get_node(proc, fp->binder);
1510                         if (node == NULL) {
1511                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1512                                 if (node == NULL) {
1513                                         return_error = BR_FAILED_REPLY;
1514                                         goto err_binder_new_node_failed;
1515                                 }
1516                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1517                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1518                         }
1519                         if (fp->cookie != node->cookie) {
1520                                 binder_user_error("%d:%d sending u%p node %d, cookie mismatch %p != %p\n",
1521                                         proc->pid, thread->pid,
1522                                         fp->binder, node->debug_id,
1523                                         fp->cookie, node->cookie);
1524                                 goto err_binder_get_ref_for_node_failed;
1525                         }
1526                         ref = binder_get_ref_for_node(target_proc, node);
1527                         if (ref == NULL) {
1528                                 return_error = BR_FAILED_REPLY;
1529                                 goto err_binder_get_ref_for_node_failed;
1530                         }
1531                         if (fp->type == BINDER_TYPE_BINDER)
1532                                 fp->type = BINDER_TYPE_HANDLE;
1533                         else
1534                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1535                         fp->handle = ref->desc;
1536                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1537                                        &thread->todo);
1538
1539                         trace_binder_transaction_node_to_ref(t, node, ref);
1540                         binder_debug(BINDER_DEBUG_TRANSACTION,
1541                                      "        node %d u%p -> ref %d desc %d\n",
1542                                      node->debug_id, node->ptr, ref->debug_id,
1543                                      ref->desc);
1544                 } break;
1545                 case BINDER_TYPE_HANDLE:
1546                 case BINDER_TYPE_WEAK_HANDLE: {
1547                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1548                         if (ref == NULL) {
1549                                 binder_user_error("%d:%d got transaction with invalid handle, %ld\n",
1550                                                 proc->pid,
1551                                                 thread->pid, fp->handle);
1552                                 return_error = BR_FAILED_REPLY;
1553                                 goto err_binder_get_ref_failed;
1554                         }
1555                         if (ref->node->proc == target_proc) {
1556                                 if (fp->type == BINDER_TYPE_HANDLE)
1557                                         fp->type = BINDER_TYPE_BINDER;
1558                                 else
1559                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1560                                 fp->binder = ref->node->ptr;
1561                                 fp->cookie = ref->node->cookie;
1562                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1563                                 trace_binder_transaction_ref_to_node(t, ref);
1564                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1565                                              "        ref %d desc %d -> node %d u%p\n",
1566                                              ref->debug_id, ref->desc, ref->node->debug_id,
1567                                              ref->node->ptr);
1568                         } else {
1569                                 struct binder_ref *new_ref;
1570                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1571                                 if (new_ref == NULL) {
1572                                         return_error = BR_FAILED_REPLY;
1573                                         goto err_binder_get_ref_for_node_failed;
1574                                 }
1575                                 fp->handle = new_ref->desc;
1576                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1577                                 trace_binder_transaction_ref_to_ref(t, ref,
1578                                                                     new_ref);
1579                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1580                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1581                                              ref->debug_id, ref->desc, new_ref->debug_id,
1582                                              new_ref->desc, ref->node->debug_id);
1583                         }
1584                 } break;
1585
1586                 case BINDER_TYPE_FD: {
1587                         int target_fd;
1588                         struct file *file;
1589
1590                         if (reply) {
1591                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1592                                         binder_user_error("%d:%d got reply with fd, %ld, but target does not allow fds\n",
1593                                                 proc->pid, thread->pid, fp->handle);
1594                                         return_error = BR_FAILED_REPLY;
1595                                         goto err_fd_not_allowed;
1596                                 }
1597                         } else if (!target_node->accept_fds) {
1598                                 binder_user_error("%d:%d got transaction with fd, %ld, but target does not allow fds\n",
1599                                         proc->pid, thread->pid, fp->handle);
1600                                 return_error = BR_FAILED_REPLY;
1601                                 goto err_fd_not_allowed;
1602                         }
1603
1604                         file = fget(fp->handle);
1605                         if (file == NULL) {
1606                                 binder_user_error("%d:%d got transaction with invalid fd, %ld\n",
1607                                         proc->pid, thread->pid, fp->handle);
1608                                 return_error = BR_FAILED_REPLY;
1609                                 goto err_fget_failed;
1610                         }
1611                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1612                         if (target_fd < 0) {
1613                                 fput(file);
1614                                 return_error = BR_FAILED_REPLY;
1615                                 goto err_get_unused_fd_failed;
1616                         }
1617                         task_fd_install(target_proc, target_fd, file);
1618                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1619                         binder_debug(BINDER_DEBUG_TRANSACTION,
1620                                      "        fd %ld -> %d\n", fp->handle, target_fd);
1621                         /* TODO: fput? */
1622                         fp->handle = target_fd;
1623                 } break;
1624
1625                 default:
1626                         binder_user_error("%d:%d got transaction with invalid object type, %lx\n",
1627                                 proc->pid, thread->pid, fp->type);
1628                         return_error = BR_FAILED_REPLY;
1629                         goto err_bad_object_type;
1630                 }
1631         }
1632         if (reply) {
1633                 BUG_ON(t->buffer->async_transaction != 0);
1634                 binder_pop_transaction(target_thread, in_reply_to);
1635         } else if (!(t->flags & TF_ONE_WAY)) {
1636                 BUG_ON(t->buffer->async_transaction != 0);
1637                 t->need_reply = 1;
1638                 t->from_parent = thread->transaction_stack;
1639                 thread->transaction_stack = t;
1640         } else {
1641                 BUG_ON(target_node == NULL);
1642                 BUG_ON(t->buffer->async_transaction != 1);
1643                 if (target_node->has_async_transaction) {
1644                         target_list = &target_node->async_todo;
1645                         target_wait = NULL;
1646                 } else
1647                         target_node->has_async_transaction = 1;
1648         }
1649         t->work.type = BINDER_WORK_TRANSACTION;
1650         list_add_tail(&t->work.entry, target_list);
1651         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1652         list_add_tail(&tcomplete->entry, &thread->todo);
1653         if (target_wait)
1654                 wake_up_interruptible(target_wait);
1655         return;
1656
1657 err_get_unused_fd_failed:
1658 err_fget_failed:
1659 err_fd_not_allowed:
1660 err_binder_get_ref_for_node_failed:
1661 err_binder_get_ref_failed:
1662 err_binder_new_node_failed:
1663 err_bad_object_type:
1664 err_bad_offset:
1665 err_copy_data_failed:
1666         trace_binder_transaction_failed_buffer_release(t->buffer);
1667         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1668         t->buffer->transaction = NULL;
1669         binder_free_buf(target_proc, t->buffer);
1670 err_binder_alloc_buf_failed:
1671         kfree(tcomplete);
1672         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1673 err_alloc_tcomplete_failed:
1674         kfree(t);
1675         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1676 err_alloc_t_failed:
1677 err_bad_call_stack:
1678 err_empty_call_stack:
1679 err_dead_binder:
1680 err_invalid_target_handle:
1681 err_no_context_mgr_node:
1682         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1683                      "%d:%d transaction failed %d, size %zd-%zd\n",
1684                      proc->pid, thread->pid, return_error,
1685                      tr->data_size, tr->offsets_size);
1686
1687         {
1688                 struct binder_transaction_log_entry *fe;
1689                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1690                 *fe = *e;
1691         }
1692
1693         BUG_ON(thread->return_error != BR_OK);
1694         if (in_reply_to) {
1695                 thread->return_error = BR_TRANSACTION_COMPLETE;
1696                 binder_send_failed_reply(in_reply_to, return_error);
1697         } else
1698                 thread->return_error = return_error;
1699 }
1700
1701 int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1702                         void __user *buffer, int size, signed long *consumed)
1703 {
1704         uint32_t cmd;
1705         void __user *ptr = buffer + *consumed;
1706         void __user *end = buffer + size;
1707
1708         while (ptr < end && thread->return_error == BR_OK) {
1709                 if (get_user(cmd, (uint32_t __user *)ptr))
1710                         return -EFAULT;
1711                 ptr += sizeof(uint32_t);
1712                 trace_binder_command(cmd);
1713                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1714                         binder_stats.bc[_IOC_NR(cmd)]++;
1715                         proc->stats.bc[_IOC_NR(cmd)]++;
1716                         thread->stats.bc[_IOC_NR(cmd)]++;
1717                 }
1718                 switch (cmd) {
1719                 case BC_INCREFS:
1720                 case BC_ACQUIRE:
1721                 case BC_RELEASE:
1722                 case BC_DECREFS: {
1723                         uint32_t target;
1724                         struct binder_ref *ref;
1725                         const char *debug_string;
1726
1727                         if (get_user(target, (uint32_t __user *)ptr))
1728                                 return -EFAULT;
1729                         ptr += sizeof(uint32_t);
1730                         if (target == 0 && binder_context_mgr_node &&
1731                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1732                                 ref = binder_get_ref_for_node(proc,
1733                                                binder_context_mgr_node);
1734                                 if (ref->desc != target) {
1735                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1736                                                 proc->pid, thread->pid,
1737                                                 ref->desc);
1738                                 }
1739                         } else
1740                                 ref = binder_get_ref(proc, target);
1741                         if (ref == NULL) {
1742                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1743                                         proc->pid, thread->pid, target);
1744                                 break;
1745                         }
1746                         switch (cmd) {
1747                         case BC_INCREFS:
1748                                 debug_string = "IncRefs";
1749                                 binder_inc_ref(ref, 0, NULL);
1750                                 break;
1751                         case BC_ACQUIRE:
1752                                 debug_string = "Acquire";
1753                                 binder_inc_ref(ref, 1, NULL);
1754                                 break;
1755                         case BC_RELEASE:
1756                                 debug_string = "Release";
1757                                 binder_dec_ref(ref, 1);
1758                                 break;
1759                         case BC_DECREFS:
1760                         default:
1761                                 debug_string = "DecRefs";
1762                                 binder_dec_ref(ref, 0);
1763                                 break;
1764                         }
1765                         binder_debug(BINDER_DEBUG_USER_REFS,
1766                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1767                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1768                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1769                         break;
1770                 }
1771                 case BC_INCREFS_DONE:
1772                 case BC_ACQUIRE_DONE: {
1773                         void __user *node_ptr;
1774                         void *cookie;
1775                         struct binder_node *node;
1776
1777                         if (get_user(node_ptr, (void * __user *)ptr))
1778                                 return -EFAULT;
1779                         ptr += sizeof(void *);
1780                         if (get_user(cookie, (void * __user *)ptr))
1781                                 return -EFAULT;
1782                         ptr += sizeof(void *);
1783                         node = binder_get_node(proc, node_ptr);
1784                         if (node == NULL) {
1785                                 binder_user_error("%d:%d %s u%p no match\n",
1786                                         proc->pid, thread->pid,
1787                                         cmd == BC_INCREFS_DONE ?
1788                                         "BC_INCREFS_DONE" :
1789                                         "BC_ACQUIRE_DONE",
1790                                         node_ptr);
1791                                 break;
1792                         }
1793                         if (cookie != node->cookie) {
1794                                 binder_user_error("%d:%d %s u%p node %d cookie mismatch %p != %p\n",
1795                                         proc->pid, thread->pid,
1796                                         cmd == BC_INCREFS_DONE ?
1797                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1798                                         node_ptr, node->debug_id,
1799                                         cookie, node->cookie);
1800                                 break;
1801                         }
1802                         if (cmd == BC_ACQUIRE_DONE) {
1803                                 if (node->pending_strong_ref == 0) {
1804                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1805                                                 proc->pid, thread->pid,
1806                                                 node->debug_id);
1807                                         break;
1808                                 }
1809                                 node->pending_strong_ref = 0;
1810                         } else {
1811                                 if (node->pending_weak_ref == 0) {
1812                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1813                                                 proc->pid, thread->pid,
1814                                                 node->debug_id);
1815                                         break;
1816                                 }
1817                                 node->pending_weak_ref = 0;
1818                         }
1819                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1820                         binder_debug(BINDER_DEBUG_USER_REFS,
1821                                      "%d:%d %s node %d ls %d lw %d\n",
1822                                      proc->pid, thread->pid,
1823                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1824                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1825                         break;
1826                 }
1827                 case BC_ATTEMPT_ACQUIRE:
1828                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1829                         return -EINVAL;
1830                 case BC_ACQUIRE_RESULT:
1831                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1832                         return -EINVAL;
1833
1834                 case BC_FREE_BUFFER: {
1835                         void __user *data_ptr;
1836                         struct binder_buffer *buffer;
1837
1838                         if (get_user(data_ptr, (void * __user *)ptr))
1839                                 return -EFAULT;
1840                         ptr += sizeof(void *);
1841
1842                         buffer = binder_buffer_lookup(proc, data_ptr);
1843                         if (buffer == NULL) {
1844                                 binder_user_error("%d:%d BC_FREE_BUFFER u%p no match\n",
1845                                         proc->pid, thread->pid, data_ptr);
1846                                 break;
1847                         }
1848                         if (!buffer->allow_user_free) {
1849                                 binder_user_error("%d:%d BC_FREE_BUFFER u%p matched unreturned buffer\n",
1850                                         proc->pid, thread->pid, data_ptr);
1851                                 break;
1852                         }
1853                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1854                                      "%d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1855                                      proc->pid, thread->pid, data_ptr, buffer->debug_id,
1856                                      buffer->transaction ? "active" : "finished");
1857
1858                         if (buffer->transaction) {
1859                                 buffer->transaction->buffer = NULL;
1860                                 buffer->transaction = NULL;
1861                         }
1862                         if (buffer->async_transaction && buffer->target_node) {
1863                                 BUG_ON(!buffer->target_node->has_async_transaction);
1864                                 if (list_empty(&buffer->target_node->async_todo))
1865                                         buffer->target_node->has_async_transaction = 0;
1866                                 else
1867                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1868                         }
1869                         trace_binder_transaction_buffer_release(buffer);
1870                         binder_transaction_buffer_release(proc, buffer, NULL);
1871                         binder_free_buf(proc, buffer);
1872                         break;
1873                 }
1874
1875                 case BC_TRANSACTION:
1876                 case BC_REPLY: {
1877                         struct binder_transaction_data tr;
1878
1879                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1880                                 return -EFAULT;
1881                         ptr += sizeof(tr);
1882                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1883                         break;
1884                 }
1885
1886                 case BC_REGISTER_LOOPER:
1887                         binder_debug(BINDER_DEBUG_THREADS,
1888                                      "%d:%d BC_REGISTER_LOOPER\n",
1889                                      proc->pid, thread->pid);
1890                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1891                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1892                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1893                                         proc->pid, thread->pid);
1894                         } else if (proc->requested_threads == 0) {
1895                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1896                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1897                                         proc->pid, thread->pid);
1898                         } else {
1899                                 proc->requested_threads--;
1900                                 proc->requested_threads_started++;
1901                         }
1902                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1903                         break;
1904                 case BC_ENTER_LOOPER:
1905                         binder_debug(BINDER_DEBUG_THREADS,
1906                                      "%d:%d BC_ENTER_LOOPER\n",
1907                                      proc->pid, thread->pid);
1908                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1909                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1910                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1911                                         proc->pid, thread->pid);
1912                         }
1913                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1914                         break;
1915                 case BC_EXIT_LOOPER:
1916                         binder_debug(BINDER_DEBUG_THREADS,
1917                                      "%d:%d BC_EXIT_LOOPER\n",
1918                                      proc->pid, thread->pid);
1919                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1920                         break;
1921
1922                 case BC_REQUEST_DEATH_NOTIFICATION:
1923                 case BC_CLEAR_DEATH_NOTIFICATION: {
1924                         uint32_t target;
1925                         void __user *cookie;
1926                         struct binder_ref *ref;
1927                         struct binder_ref_death *death;
1928
1929                         if (get_user(target, (uint32_t __user *)ptr))
1930                                 return -EFAULT;
1931                         ptr += sizeof(uint32_t);
1932                         if (get_user(cookie, (void __user * __user *)ptr))
1933                                 return -EFAULT;
1934                         ptr += sizeof(void *);
1935                         ref = binder_get_ref(proc, target);
1936                         if (ref == NULL) {
1937                                 binder_user_error("%d:%d %s invalid ref %d\n",
1938                                         proc->pid, thread->pid,
1939                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1940                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1941                                         "BC_CLEAR_DEATH_NOTIFICATION",
1942                                         target);
1943                                 break;
1944                         }
1945
1946                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1947                                      "%d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
1948                                      proc->pid, thread->pid,
1949                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1950                                      "BC_REQUEST_DEATH_NOTIFICATION" :
1951                                      "BC_CLEAR_DEATH_NOTIFICATION",
1952                                      cookie, ref->debug_id, ref->desc,
1953                                      ref->strong, ref->weak, ref->node->debug_id);
1954
1955                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1956                                 if (ref->death) {
1957                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
1958                                                 proc->pid, thread->pid);
1959                                         break;
1960                                 }
1961                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
1962                                 if (death == NULL) {
1963                                         thread->return_error = BR_ERROR;
1964                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1965                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
1966                                                      proc->pid, thread->pid);
1967                                         break;
1968                                 }
1969                                 binder_stats_created(BINDER_STAT_DEATH);
1970                                 INIT_LIST_HEAD(&death->work.entry);
1971                                 death->cookie = cookie;
1972                                 ref->death = death;
1973                                 if (ref->node->proc == NULL) {
1974                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
1975                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1976                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
1977                                         } else {
1978                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
1979                                                 wake_up_interruptible(&proc->wait);
1980                                         }
1981                                 }
1982                         } else {
1983                                 if (ref->death == NULL) {
1984                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
1985                                                 proc->pid, thread->pid);
1986                                         break;
1987                                 }
1988                                 death = ref->death;
1989                                 if (death->cookie != cookie) {
1990                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %p != %p\n",
1991                                                 proc->pid, thread->pid,
1992                                                 death->cookie, cookie);
1993                                         break;
1994                                 }
1995                                 ref->death = NULL;
1996                                 if (list_empty(&death->work.entry)) {
1997                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
1998                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1999                                                 list_add_tail(&death->work.entry, &thread->todo);
2000                                         } else {
2001                                                 list_add_tail(&death->work.entry, &proc->todo);
2002                                                 wake_up_interruptible(&proc->wait);
2003                                         }
2004                                 } else {
2005                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2006                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2007                                 }
2008                         }
2009                 } break;
2010                 case BC_DEAD_BINDER_DONE: {
2011                         struct binder_work *w;
2012                         void __user *cookie;
2013                         struct binder_ref_death *death = NULL;
2014                         if (get_user(cookie, (void __user * __user *)ptr))
2015                                 return -EFAULT;
2016
2017                         ptr += sizeof(void *);
2018                         list_for_each_entry(w, &proc->delivered_death, entry) {
2019                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2020                                 if (tmp_death->cookie == cookie) {
2021                                         death = tmp_death;
2022                                         break;
2023                                 }
2024                         }
2025                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2026                                      "%d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2027                                      proc->pid, thread->pid, cookie, death);
2028                         if (death == NULL) {
2029                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %p not found\n",
2030                                         proc->pid, thread->pid, cookie);
2031                                 break;
2032                         }
2033
2034                         list_del_init(&death->work.entry);
2035                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2036                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2037                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2038                                         list_add_tail(&death->work.entry, &thread->todo);
2039                                 } else {
2040                                         list_add_tail(&death->work.entry, &proc->todo);
2041                                         wake_up_interruptible(&proc->wait);
2042                                 }
2043                         }
2044                 } break;
2045
2046                 default:
2047                         pr_err("%d:%d unknown command %d\n",
2048                                proc->pid, thread->pid, cmd);
2049                         return -EINVAL;
2050                 }
2051                 *consumed = ptr - buffer;
2052         }
2053         return 0;
2054 }
2055
2056 void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2057                     uint32_t cmd)
2058 {
2059         trace_binder_return(cmd);
2060         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2061                 binder_stats.br[_IOC_NR(cmd)]++;
2062                 proc->stats.br[_IOC_NR(cmd)]++;
2063                 thread->stats.br[_IOC_NR(cmd)]++;
2064         }
2065 }
2066
2067 static int binder_has_proc_work(struct binder_proc *proc,
2068                                 struct binder_thread *thread)
2069 {
2070         return !list_empty(&proc->todo) ||
2071                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2072 }
2073
2074 static int binder_has_thread_work(struct binder_thread *thread)
2075 {
2076         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2077                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2078 }
2079
2080 static int binder_thread_read(struct binder_proc *proc,
2081                               struct binder_thread *thread,
2082                               void  __user *buffer, int size,
2083                               signed long *consumed, int non_block)
2084 {
2085         void __user *ptr = buffer + *consumed;
2086         void __user *end = buffer + size;
2087
2088         int ret = 0;
2089         int wait_for_proc_work;
2090
2091         if (*consumed == 0) {
2092                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2093                         return -EFAULT;
2094                 ptr += sizeof(uint32_t);
2095         }
2096
2097 retry:
2098         wait_for_proc_work = thread->transaction_stack == NULL &&
2099                                 list_empty(&thread->todo);
2100
2101         if (thread->return_error != BR_OK && ptr < end) {
2102                 if (thread->return_error2 != BR_OK) {
2103                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2104                                 return -EFAULT;
2105                         ptr += sizeof(uint32_t);
2106                         binder_stat_br(proc, thread, thread->return_error2);
2107                         if (ptr == end)
2108                                 goto done;
2109                         thread->return_error2 = BR_OK;
2110                 }
2111                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2112                         return -EFAULT;
2113                 ptr += sizeof(uint32_t);
2114                 binder_stat_br(proc, thread, thread->return_error);
2115                 thread->return_error = BR_OK;
2116                 goto done;
2117         }
2118
2119
2120         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2121         if (wait_for_proc_work)
2122                 proc->ready_threads++;
2123
2124         binder_unlock(__func__);
2125
2126         trace_binder_wait_for_work(wait_for_proc_work,
2127                                    !!thread->transaction_stack,
2128                                    !list_empty(&thread->todo));
2129         if (wait_for_proc_work) {
2130                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2131                                         BINDER_LOOPER_STATE_ENTERED))) {
2132                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2133                                 proc->pid, thread->pid, thread->looper);
2134                         wait_event_interruptible(binder_user_error_wait,
2135                                                  binder_stop_on_user_error < 2);
2136                 }
2137                 binder_set_nice(proc->default_priority);
2138                 if (non_block) {
2139                         if (!binder_has_proc_work(proc, thread))
2140                                 ret = -EAGAIN;
2141                 } else
2142                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2143         } else {
2144                 if (non_block) {
2145                         if (!binder_has_thread_work(thread))
2146                                 ret = -EAGAIN;
2147                 } else
2148                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2149         }
2150
2151         binder_lock(__func__);
2152
2153         if (wait_for_proc_work)
2154                 proc->ready_threads--;
2155         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2156
2157         if (ret)
2158                 return ret;
2159
2160         while (1) {
2161                 uint32_t cmd;
2162                 struct binder_transaction_data tr;
2163                 struct binder_work *w;
2164                 struct binder_transaction *t = NULL;
2165
2166                 if (!list_empty(&thread->todo))
2167                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2168                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2169                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2170                 else {
2171                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2172                                 goto retry;
2173                         break;
2174                 }
2175
2176                 if (end - ptr < sizeof(tr) + 4)
2177                         break;
2178
2179                 switch (w->type) {
2180                 case BINDER_WORK_TRANSACTION: {
2181                         t = container_of(w, struct binder_transaction, work);
2182                 } break;
2183                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2184                         cmd = BR_TRANSACTION_COMPLETE;
2185                         if (put_user(cmd, (uint32_t __user *)ptr))
2186                                 return -EFAULT;
2187                         ptr += sizeof(uint32_t);
2188
2189                         binder_stat_br(proc, thread, cmd);
2190                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2191                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2192                                      proc->pid, thread->pid);
2193
2194                         list_del(&w->entry);
2195                         kfree(w);
2196                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2197                 } break;
2198                 case BINDER_WORK_NODE: {
2199                         struct binder_node *node = container_of(w, struct binder_node, work);
2200                         uint32_t cmd = BR_NOOP;
2201                         const char *cmd_name;
2202                         int strong = node->internal_strong_refs || node->local_strong_refs;
2203                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2204                         if (weak && !node->has_weak_ref) {
2205                                 cmd = BR_INCREFS;
2206                                 cmd_name = "BR_INCREFS";
2207                                 node->has_weak_ref = 1;
2208                                 node->pending_weak_ref = 1;
2209                                 node->local_weak_refs++;
2210                         } else if (strong && !node->has_strong_ref) {
2211                                 cmd = BR_ACQUIRE;
2212                                 cmd_name = "BR_ACQUIRE";
2213                                 node->has_strong_ref = 1;
2214                                 node->pending_strong_ref = 1;
2215                                 node->local_strong_refs++;
2216                         } else if (!strong && node->has_strong_ref) {
2217                                 cmd = BR_RELEASE;
2218                                 cmd_name = "BR_RELEASE";
2219                                 node->has_strong_ref = 0;
2220                         } else if (!weak && node->has_weak_ref) {
2221                                 cmd = BR_DECREFS;
2222                                 cmd_name = "BR_DECREFS";
2223                                 node->has_weak_ref = 0;
2224                         }
2225                         if (cmd != BR_NOOP) {
2226                                 if (put_user(cmd, (uint32_t __user *)ptr))
2227                                         return -EFAULT;
2228                                 ptr += sizeof(uint32_t);
2229                                 if (put_user(node->ptr, (void * __user *)ptr))
2230                                         return -EFAULT;
2231                                 ptr += sizeof(void *);
2232                                 if (put_user(node->cookie, (void * __user *)ptr))
2233                                         return -EFAULT;
2234                                 ptr += sizeof(void *);
2235
2236                                 binder_stat_br(proc, thread, cmd);
2237                                 binder_debug(BINDER_DEBUG_USER_REFS,
2238                                              "%d:%d %s %d u%p c%p\n",
2239                                              proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2240                         } else {
2241                                 list_del_init(&w->entry);
2242                                 if (!weak && !strong) {
2243                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2244                                                      "%d:%d node %d u%p c%p deleted\n",
2245                                                      proc->pid, thread->pid, node->debug_id,
2246                                                      node->ptr, node->cookie);
2247                                         rb_erase(&node->rb_node, &proc->nodes);
2248                                         kfree(node);
2249                                         binder_stats_deleted(BINDER_STAT_NODE);
2250                                 } else {
2251                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2252                                                      "%d:%d node %d u%p c%p state unchanged\n",
2253                                                      proc->pid, thread->pid, node->debug_id, node->ptr,
2254                                                      node->cookie);
2255                                 }
2256                         }
2257                 } break;
2258                 case BINDER_WORK_DEAD_BINDER:
2259                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2260                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2261                         struct binder_ref_death *death;
2262                         uint32_t cmd;
2263
2264                         death = container_of(w, struct binder_ref_death, work);
2265                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2266                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2267                         else
2268                                 cmd = BR_DEAD_BINDER;
2269                         if (put_user(cmd, (uint32_t __user *)ptr))
2270                                 return -EFAULT;
2271                         ptr += sizeof(uint32_t);
2272                         if (put_user(death->cookie, (void * __user *)ptr))
2273                                 return -EFAULT;
2274                         ptr += sizeof(void *);
2275                         binder_stat_br(proc, thread, cmd);
2276                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2277                                      "%d:%d %s %p\n",
2278                                       proc->pid, thread->pid,
2279                                       cmd == BR_DEAD_BINDER ?
2280                                       "BR_DEAD_BINDER" :
2281                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2282                                       death->cookie);
2283
2284                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2285                                 list_del(&w->entry);
2286                                 kfree(death);
2287                                 binder_stats_deleted(BINDER_STAT_DEATH);
2288                         } else
2289                                 list_move(&w->entry, &proc->delivered_death);
2290                         if (cmd == BR_DEAD_BINDER)
2291                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2292                 } break;
2293                 }
2294
2295                 if (!t)
2296                         continue;
2297
2298                 BUG_ON(t->buffer == NULL);
2299                 if (t->buffer->target_node) {
2300                         struct binder_node *target_node = t->buffer->target_node;
2301                         tr.target.ptr = target_node->ptr;
2302                         tr.cookie =  target_node->cookie;
2303                         t->saved_priority = task_nice(current);
2304                         if (t->priority < target_node->min_priority &&
2305                             !(t->flags & TF_ONE_WAY))
2306                                 binder_set_nice(t->priority);
2307                         else if (!(t->flags & TF_ONE_WAY) ||
2308                                  t->saved_priority > target_node->min_priority)
2309                                 binder_set_nice(target_node->min_priority);
2310                         cmd = BR_TRANSACTION;
2311                 } else {
2312                         tr.target.ptr = NULL;
2313                         tr.cookie = NULL;
2314                         cmd = BR_REPLY;
2315                 }
2316                 tr.code = t->code;
2317                 tr.flags = t->flags;
2318                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2319
2320                 if (t->from) {
2321                         struct task_struct *sender = t->from->proc->tsk;
2322                         tr.sender_pid = task_tgid_nr_ns(sender,
2323                                                         current->nsproxy->pid_ns);
2324                 } else {
2325                         tr.sender_pid = 0;
2326                 }
2327
2328                 tr.data_size = t->buffer->data_size;
2329                 tr.offsets_size = t->buffer->offsets_size;
2330                 tr.data.ptr.buffer = (void *)t->buffer->data +
2331                                         proc->user_buffer_offset;
2332                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2333                                         ALIGN(t->buffer->data_size,
2334                                             sizeof(void *));
2335
2336                 if (put_user(cmd, (uint32_t __user *)ptr))
2337                         return -EFAULT;
2338                 ptr += sizeof(uint32_t);
2339                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2340                         return -EFAULT;
2341                 ptr += sizeof(tr);
2342
2343                 trace_binder_transaction_received(t);
2344                 binder_stat_br(proc, thread, cmd);
2345                 binder_debug(BINDER_DEBUG_TRANSACTION,
2346                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %p-%p\n",
2347                              proc->pid, thread->pid,
2348                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2349                              "BR_REPLY",
2350                              t->debug_id, t->from ? t->from->proc->pid : 0,
2351                              t->from ? t->from->pid : 0, cmd,
2352                              t->buffer->data_size, t->buffer->offsets_size,
2353                              tr.data.ptr.buffer, tr.data.ptr.offsets);
2354
2355                 list_del(&t->work.entry);
2356                 t->buffer->allow_user_free = 1;
2357                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2358                         t->to_parent = thread->transaction_stack;
2359                         t->to_thread = thread;
2360                         thread->transaction_stack = t;
2361                 } else {
2362                         t->buffer->transaction = NULL;
2363                         kfree(t);
2364                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2365                 }
2366                 break;
2367         }
2368
2369 done:
2370
2371         *consumed = ptr - buffer;
2372         if (proc->requested_threads + proc->ready_threads == 0 &&
2373             proc->requested_threads_started < proc->max_threads &&
2374             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2375              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2376              /*spawn a new thread if we leave this out */) {
2377                 proc->requested_threads++;
2378                 binder_debug(BINDER_DEBUG_THREADS,
2379                              "%d:%d BR_SPAWN_LOOPER\n",
2380                              proc->pid, thread->pid);
2381                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2382                         return -EFAULT;
2383                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2384         }
2385         return 0;
2386 }
2387
2388 static void binder_release_work(struct list_head *list)
2389 {
2390         struct binder_work *w;
2391         while (!list_empty(list)) {
2392                 w = list_first_entry(list, struct binder_work, entry);
2393                 list_del_init(&w->entry);
2394                 switch (w->type) {
2395                 case BINDER_WORK_TRANSACTION: {
2396                         struct binder_transaction *t;
2397
2398                         t = container_of(w, struct binder_transaction, work);
2399                         if (t->buffer->target_node &&
2400                             !(t->flags & TF_ONE_WAY)) {
2401                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2402                         } else {
2403                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2404                                         "undelivered transaction %d\n",
2405                                         t->debug_id);
2406                                 t->buffer->transaction = NULL;
2407                                 kfree(t);
2408                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2409                         }
2410                 } break;
2411                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2412                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2413                                 "undelivered TRANSACTION_COMPLETE\n");
2414                         kfree(w);
2415                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2416                 } break;
2417                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2418                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2419                         struct binder_ref_death *death;
2420
2421                         death = container_of(w, struct binder_ref_death, work);
2422                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2423                                 "undelivered death notification, %p\n",
2424                                 death->cookie);
2425                         kfree(death);
2426                         binder_stats_deleted(BINDER_STAT_DEATH);
2427                 } break;
2428                 default:
2429                         pr_err("unexpected work type, %d, not freed\n",
2430                                w->type);
2431                         break;
2432                 }
2433         }
2434
2435 }
2436
2437 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2438 {
2439         struct binder_thread *thread = NULL;
2440         struct rb_node *parent = NULL;
2441         struct rb_node **p = &proc->threads.rb_node;
2442
2443         while (*p) {
2444                 parent = *p;
2445                 thread = rb_entry(parent, struct binder_thread, rb_node);
2446
2447                 if (current->pid < thread->pid)
2448                         p = &(*p)->rb_left;
2449                 else if (current->pid > thread->pid)
2450                         p = &(*p)->rb_right;
2451                 else
2452                         break;
2453         }
2454         if (*p == NULL) {
2455                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2456                 if (thread == NULL)
2457                         return NULL;
2458                 binder_stats_created(BINDER_STAT_THREAD);
2459                 thread->proc = proc;
2460                 thread->pid = current->pid;
2461                 init_waitqueue_head(&thread->wait);
2462                 INIT_LIST_HEAD(&thread->todo);
2463                 rb_link_node(&thread->rb_node, parent, p);
2464                 rb_insert_color(&thread->rb_node, &proc->threads);
2465                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2466                 thread->return_error = BR_OK;
2467                 thread->return_error2 = BR_OK;
2468         }
2469         return thread;
2470 }
2471
2472 static int binder_free_thread(struct binder_proc *proc,
2473                               struct binder_thread *thread)
2474 {
2475         struct binder_transaction *t;
2476         struct binder_transaction *send_reply = NULL;
2477         int active_transactions = 0;
2478
2479         rb_erase(&thread->rb_node, &proc->threads);
2480         t = thread->transaction_stack;
2481         if (t && t->to_thread == thread)
2482                 send_reply = t;
2483         while (t) {
2484                 active_transactions++;
2485                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2486                              "release %d:%d transaction %d %s, still active\n",
2487                               proc->pid, thread->pid,
2488                              t->debug_id,
2489                              (t->to_thread == thread) ? "in" : "out");
2490
2491                 if (t->to_thread == thread) {
2492                         t->to_proc = NULL;
2493                         t->to_thread = NULL;
2494                         if (t->buffer) {
2495                                 t->buffer->transaction = NULL;
2496                                 t->buffer = NULL;
2497                         }
2498                         t = t->to_parent;
2499                 } else if (t->from == thread) {
2500                         t->from = NULL;
2501                         t = t->from_parent;
2502                 } else
2503                         BUG();
2504         }
2505         if (send_reply)
2506                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2507         binder_release_work(&thread->todo);
2508         kfree(thread);
2509         binder_stats_deleted(BINDER_STAT_THREAD);
2510         return active_transactions;
2511 }
2512
2513 static unsigned int binder_poll(struct file *filp,
2514                                 struct poll_table_struct *wait)
2515 {
2516         struct binder_proc *proc = filp->private_data;
2517         struct binder_thread *thread = NULL;
2518         int wait_for_proc_work;
2519
2520         binder_lock(__func__);
2521
2522         thread = binder_get_thread(proc);
2523
2524         wait_for_proc_work = thread->transaction_stack == NULL &&
2525                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2526
2527         binder_unlock(__func__);
2528
2529         if (wait_for_proc_work) {
2530                 if (binder_has_proc_work(proc, thread))
2531                         return POLLIN;
2532                 poll_wait(filp, &proc->wait, wait);
2533                 if (binder_has_proc_work(proc, thread))
2534                         return POLLIN;
2535         } else {
2536                 if (binder_has_thread_work(thread))
2537                         return POLLIN;
2538                 poll_wait(filp, &thread->wait, wait);
2539                 if (binder_has_thread_work(thread))
2540                         return POLLIN;
2541         }
2542         return 0;
2543 }
2544
2545 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2546 {
2547         int ret;
2548         struct binder_proc *proc = filp->private_data;
2549         struct binder_thread *thread;
2550         unsigned int size = _IOC_SIZE(cmd);
2551         void __user *ubuf = (void __user *)arg;
2552
2553         /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2554
2555         trace_binder_ioctl(cmd, arg);
2556
2557         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2558         if (ret)
2559                 goto err_unlocked;
2560
2561         binder_lock(__func__);
2562         thread = binder_get_thread(proc);
2563         if (thread == NULL) {
2564                 ret = -ENOMEM;
2565                 goto err;
2566         }
2567
2568         switch (cmd) {
2569         case BINDER_WRITE_READ: {
2570                 struct binder_write_read bwr;
2571                 if (size != sizeof(struct binder_write_read)) {
2572                         ret = -EINVAL;
2573                         goto err;
2574                 }
2575                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2576                         ret = -EFAULT;
2577                         goto err;
2578                 }
2579                 binder_debug(BINDER_DEBUG_READ_WRITE,
2580                              "%d:%d write %ld at %08lx, read %ld at %08lx\n",
2581                              proc->pid, thread->pid, bwr.write_size,
2582                              bwr.write_buffer, bwr.read_size, bwr.read_buffer);
2583
2584                 if (bwr.write_size > 0) {
2585                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2586                         trace_binder_write_done(ret);
2587                         if (ret < 0) {
2588                                 bwr.read_consumed = 0;
2589                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2590                                         ret = -EFAULT;
2591                                 goto err;
2592                         }
2593                 }
2594                 if (bwr.read_size > 0) {
2595                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2596                         trace_binder_read_done(ret);
2597                         if (!list_empty(&proc->todo))
2598                                 wake_up_interruptible(&proc->wait);
2599                         if (ret < 0) {
2600                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2601                                         ret = -EFAULT;
2602                                 goto err;
2603                         }
2604                 }
2605                 binder_debug(BINDER_DEBUG_READ_WRITE,
2606                              "%d:%d wrote %ld of %ld, read return %ld of %ld\n",
2607                              proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2608                              bwr.read_consumed, bwr.read_size);
2609                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2610                         ret = -EFAULT;
2611                         goto err;
2612                 }
2613                 break;
2614         }
2615         case BINDER_SET_MAX_THREADS:
2616                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2617                         ret = -EINVAL;
2618                         goto err;
2619                 }
2620                 break;
2621         case BINDER_SET_CONTEXT_MGR:
2622                 if (binder_context_mgr_node != NULL) {
2623                         pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2624                         ret = -EBUSY;
2625                         goto err;
2626                 }
2627                 if (uid_valid(binder_context_mgr_uid)) {
2628                         if (!uid_eq(binder_context_mgr_uid, current->cred->euid)) {
2629                                 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2630                                        from_kuid(&init_user_ns, current->cred->euid),
2631                                        from_kuid(&init_user_ns, binder_context_mgr_uid));
2632                                 ret = -EPERM;
2633                                 goto err;
2634                         }
2635                 } else
2636                         binder_context_mgr_uid = current->cred->euid;
2637                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2638                 if (binder_context_mgr_node == NULL) {
2639                         ret = -ENOMEM;
2640                         goto err;
2641                 }
2642                 binder_context_mgr_node->local_weak_refs++;
2643                 binder_context_mgr_node->local_strong_refs++;
2644                 binder_context_mgr_node->has_strong_ref = 1;
2645                 binder_context_mgr_node->has_weak_ref = 1;
2646                 break;
2647         case BINDER_THREAD_EXIT:
2648                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2649                              proc->pid, thread->pid);
2650                 binder_free_thread(proc, thread);
2651                 thread = NULL;
2652                 break;
2653         case BINDER_VERSION:
2654                 if (size != sizeof(struct binder_version)) {
2655                         ret = -EINVAL;
2656                         goto err;
2657                 }
2658                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2659                         ret = -EINVAL;
2660                         goto err;
2661                 }
2662                 break;
2663         default:
2664                 ret = -EINVAL;
2665                 goto err;
2666         }
2667         ret = 0;
2668 err:
2669         if (thread)
2670                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2671         binder_unlock(__func__);
2672         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2673         if (ret && ret != -ERESTARTSYS)
2674                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2675 err_unlocked:
2676         trace_binder_ioctl_done(ret);
2677         return ret;
2678 }
2679
2680 static void binder_vma_open(struct vm_area_struct *vma)
2681 {
2682         struct binder_proc *proc = vma->vm_private_data;
2683         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2684                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2685                      proc->pid, vma->vm_start, vma->vm_end,
2686                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2687                      (unsigned long)pgprot_val(vma->vm_page_prot));
2688 }
2689
2690 static void binder_vma_close(struct vm_area_struct *vma)
2691 {
2692         struct binder_proc *proc = vma->vm_private_data;
2693         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2694                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2695                      proc->pid, vma->vm_start, vma->vm_end,
2696                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2697                      (unsigned long)pgprot_val(vma->vm_page_prot));
2698         proc->vma = NULL;
2699         proc->vma_vm_mm = NULL;
2700         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2701 }
2702
2703 static struct vm_operations_struct binder_vm_ops = {
2704         .open = binder_vma_open,
2705         .close = binder_vma_close,
2706 };
2707
2708 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2709 {
2710         int ret;
2711         struct vm_struct *area;
2712         struct binder_proc *proc = filp->private_data;
2713         const char *failure_string;
2714         struct binder_buffer *buffer;
2715
2716         if (proc->tsk != current)
2717                 return -EINVAL;
2718
2719         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2720                 vma->vm_end = vma->vm_start + SZ_4M;
2721
2722         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2723                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2724                      proc->pid, vma->vm_start, vma->vm_end,
2725                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2726                      (unsigned long)pgprot_val(vma->vm_page_prot));
2727
2728         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2729                 ret = -EPERM;
2730                 failure_string = "bad vm_flags";
2731                 goto err_bad_arg;
2732         }
2733         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2734
2735         mutex_lock(&binder_mmap_lock);
2736         if (proc->buffer) {
2737                 ret = -EBUSY;
2738                 failure_string = "already mapped";
2739                 goto err_already_mapped;
2740         }
2741
2742         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2743         if (area == NULL) {
2744                 ret = -ENOMEM;
2745                 failure_string = "get_vm_area";
2746                 goto err_get_vm_area_failed;
2747         }
2748         proc->buffer = area->addr;
2749         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2750         mutex_unlock(&binder_mmap_lock);
2751
2752 #ifdef CONFIG_CPU_CACHE_VIPT
2753         if (cache_is_vipt_aliasing()) {
2754                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2755                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2756                         vma->vm_start += PAGE_SIZE;
2757                 }
2758         }
2759 #endif
2760         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2761         if (proc->pages == NULL) {
2762                 ret = -ENOMEM;
2763                 failure_string = "alloc page array";
2764                 goto err_alloc_pages_failed;
2765         }
2766         proc->buffer_size = vma->vm_end - vma->vm_start;
2767
2768         vma->vm_ops = &binder_vm_ops;
2769         vma->vm_private_data = proc;
2770
2771         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2772                 ret = -ENOMEM;
2773                 failure_string = "alloc small buf";
2774                 goto err_alloc_small_buf_failed;
2775         }
2776         buffer = proc->buffer;
2777         INIT_LIST_HEAD(&proc->buffers);
2778         list_add(&buffer->entry, &proc->buffers);
2779         buffer->free = 1;
2780         binder_insert_free_buffer(proc, buffer);
2781         proc->free_async_space = proc->buffer_size / 2;
2782         barrier();
2783         proc->files = get_files_struct(current);
2784         proc->vma = vma;
2785         proc->vma_vm_mm = vma->vm_mm;
2786
2787         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2788                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2789         return 0;
2790
2791 err_alloc_small_buf_failed:
2792         kfree(proc->pages);
2793         proc->pages = NULL;
2794 err_alloc_pages_failed:
2795         mutex_lock(&binder_mmap_lock);
2796         vfree(proc->buffer);
2797         proc->buffer = NULL;
2798 err_get_vm_area_failed:
2799 err_already_mapped:
2800         mutex_unlock(&binder_mmap_lock);
2801 err_bad_arg:
2802         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2803                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2804         return ret;
2805 }
2806
2807 static int binder_open(struct inode *nodp, struct file *filp)
2808 {
2809         struct binder_proc *proc;
2810
2811         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2812                      current->group_leader->pid, current->pid);
2813
2814         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2815         if (proc == NULL)
2816                 return -ENOMEM;
2817         get_task_struct(current);
2818         proc->tsk = current;
2819         INIT_LIST_HEAD(&proc->todo);
2820         init_waitqueue_head(&proc->wait);
2821         proc->default_priority = task_nice(current);
2822
2823         binder_lock(__func__);
2824
2825         binder_stats_created(BINDER_STAT_PROC);
2826         hlist_add_head(&proc->proc_node, &binder_procs);
2827         proc->pid = current->group_leader->pid;
2828         INIT_LIST_HEAD(&proc->delivered_death);
2829         filp->private_data = proc;
2830
2831         binder_unlock(__func__);
2832
2833         if (binder_debugfs_dir_entry_proc) {
2834                 char strbuf[11];
2835                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2836                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2837                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2838         }
2839
2840         return 0;
2841 }
2842
2843 static int binder_flush(struct file *filp, fl_owner_t id)
2844 {
2845         struct binder_proc *proc = filp->private_data;
2846
2847         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2848
2849         return 0;
2850 }
2851
2852 static void binder_deferred_flush(struct binder_proc *proc)
2853 {
2854         struct rb_node *n;
2855         int wake_count = 0;
2856         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2857                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2858                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2859                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2860                         wake_up_interruptible(&thread->wait);
2861                         wake_count++;
2862                 }
2863         }
2864         wake_up_interruptible_all(&proc->wait);
2865
2866         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2867                      "binder_flush: %d woke %d threads\n", proc->pid,
2868                      wake_count);
2869 }
2870
2871 static int binder_release(struct inode *nodp, struct file *filp)
2872 {
2873         struct binder_proc *proc = filp->private_data;
2874         debugfs_remove(proc->debugfs_entry);
2875         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2876
2877         return 0;
2878 }
2879
2880 static void binder_deferred_release(struct binder_proc *proc)
2881 {
2882         struct hlist_node *pos;
2883         struct binder_transaction *t;
2884         struct rb_node *n;
2885         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2886
2887         BUG_ON(proc->vma);
2888         BUG_ON(proc->files);
2889
2890         hlist_del(&proc->proc_node);
2891         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2892                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2893                              "binder_release: %d context_mgr_node gone\n",
2894                              proc->pid);
2895                 binder_context_mgr_node = NULL;
2896         }
2897
2898         threads = 0;
2899         active_transactions = 0;
2900         while ((n = rb_first(&proc->threads))) {
2901                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2902                 threads++;
2903                 active_transactions += binder_free_thread(proc, thread);
2904         }
2905         nodes = 0;
2906         incoming_refs = 0;
2907         while ((n = rb_first(&proc->nodes))) {
2908                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2909
2910                 nodes++;
2911                 rb_erase(&node->rb_node, &proc->nodes);
2912                 list_del_init(&node->work.entry);
2913                 binder_release_work(&node->async_todo);
2914                 if (hlist_empty(&node->refs)) {
2915                         kfree(node);
2916                         binder_stats_deleted(BINDER_STAT_NODE);
2917                 } else {
2918                         struct binder_ref *ref;
2919                         int death = 0;
2920
2921                         node->proc = NULL;
2922                         node->local_strong_refs = 0;
2923                         node->local_weak_refs = 0;
2924                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
2925
2926                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2927                                 incoming_refs++;
2928                                 if (ref->death) {
2929                                         death++;
2930                                         if (list_empty(&ref->death->work.entry)) {
2931                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2932                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2933                                                 wake_up_interruptible(&ref->proc->wait);
2934                                         } else
2935                                                 BUG();
2936                                 }
2937                         }
2938                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2939                                      "node %d now dead, refs %d, death %d\n",
2940                                       node->debug_id, incoming_refs, death);
2941                 }
2942         }
2943         outgoing_refs = 0;
2944         while ((n = rb_first(&proc->refs_by_desc))) {
2945                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
2946                                                   rb_node_desc);
2947                 outgoing_refs++;
2948                 binder_delete_ref(ref);
2949         }
2950         binder_release_work(&proc->todo);
2951         binder_release_work(&proc->delivered_death);
2952         buffers = 0;
2953
2954         while ((n = rb_first(&proc->allocated_buffers))) {
2955                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
2956                                                         rb_node);
2957                 t = buffer->transaction;
2958                 if (t) {
2959                         t->buffer = NULL;
2960                         buffer->transaction = NULL;
2961                         pr_err("release proc %d, transaction %d, not freed\n",
2962                                proc->pid, t->debug_id);
2963                         /*BUG();*/
2964                 }
2965                 binder_free_buf(proc, buffer);
2966                 buffers++;
2967         }
2968
2969         binder_stats_deleted(BINDER_STAT_PROC);
2970
2971         page_count = 0;
2972         if (proc->pages) {
2973                 int i;
2974                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
2975                         if (proc->pages[i]) {
2976                                 void *page_addr = proc->buffer + i * PAGE_SIZE;
2977                                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
2978                                              "binder_release: %d: page %d at %p not freed\n",
2979                                              proc->pid, i,
2980                                              page_addr);
2981                                 unmap_kernel_range((unsigned long)page_addr,
2982                                         PAGE_SIZE);
2983                                 __free_page(proc->pages[i]);
2984                                 page_count++;
2985                         }
2986                 }
2987                 kfree(proc->pages);
2988                 vfree(proc->buffer);
2989         }
2990
2991         put_task_struct(proc->tsk);
2992
2993         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2994                      "binder_release: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
2995                      proc->pid, threads, nodes, incoming_refs, outgoing_refs,
2996                      active_transactions, buffers, page_count);
2997
2998         kfree(proc);
2999 }
3000
3001 static void binder_deferred_func(struct work_struct *work)
3002 {
3003         struct binder_proc *proc;
3004         struct files_struct *files;
3005
3006         int defer;
3007         do {
3008                 binder_lock(__func__);
3009                 mutex_lock(&binder_deferred_lock);
3010                 if (!hlist_empty(&binder_deferred_list)) {
3011                         proc = hlist_entry(binder_deferred_list.first,
3012                                         struct binder_proc, deferred_work_node);
3013                         hlist_del_init(&proc->deferred_work_node);
3014                         defer = proc->deferred_work;
3015                         proc->deferred_work = 0;
3016                 } else {
3017                         proc = NULL;
3018                         defer = 0;
3019                 }
3020                 mutex_unlock(&binder_deferred_lock);
3021
3022                 files = NULL;
3023                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3024                         files = proc->files;
3025                         if (files)
3026                                 proc->files = NULL;
3027                 }
3028
3029                 if (defer & BINDER_DEFERRED_FLUSH)
3030                         binder_deferred_flush(proc);
3031
3032                 if (defer & BINDER_DEFERRED_RELEASE)
3033                         binder_deferred_release(proc); /* frees proc */
3034
3035                 binder_unlock(__func__);
3036                 if (files)
3037                         put_files_struct(files);
3038         } while (proc);
3039 }
3040 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3041
3042 static void
3043 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3044 {
3045         mutex_lock(&binder_deferred_lock);
3046         proc->deferred_work |= defer;
3047         if (hlist_unhashed(&proc->deferred_work_node)) {
3048                 hlist_add_head(&proc->deferred_work_node,
3049                                 &binder_deferred_list);
3050                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3051         }
3052         mutex_unlock(&binder_deferred_lock);
3053 }
3054
3055 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3056                                      struct binder_transaction *t)
3057 {
3058         seq_printf(m,
3059                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3060                    prefix, t->debug_id, t,
3061                    t->from ? t->from->proc->pid : 0,
3062                    t->from ? t->from->pid : 0,
3063                    t->to_proc ? t->to_proc->pid : 0,
3064                    t->to_thread ? t->to_thread->pid : 0,
3065                    t->code, t->flags, t->priority, t->need_reply);
3066         if (t->buffer == NULL) {
3067                 seq_puts(m, " buffer free\n");
3068                 return;
3069         }
3070         if (t->buffer->target_node)
3071                 seq_printf(m, " node %d",
3072                            t->buffer->target_node->debug_id);
3073         seq_printf(m, " size %zd:%zd data %p\n",
3074                    t->buffer->data_size, t->buffer->offsets_size,
3075                    t->buffer->data);
3076 }
3077
3078 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3079                                 struct binder_buffer *buffer)
3080 {
3081         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3082                    prefix, buffer->debug_id, buffer->data,
3083                    buffer->data_size, buffer->offsets_size,
3084                    buffer->transaction ? "active" : "delivered");
3085 }
3086
3087 static void print_binder_work(struct seq_file *m, const char *prefix,
3088                               const char *transaction_prefix,
3089                               struct binder_work *w)
3090 {
3091         struct binder_node *node;
3092         struct binder_transaction *t;
3093
3094         switch (w->type) {
3095         case BINDER_WORK_TRANSACTION:
3096                 t = container_of(w, struct binder_transaction, work);
3097                 print_binder_transaction(m, transaction_prefix, t);
3098                 break;
3099         case BINDER_WORK_TRANSACTION_COMPLETE:
3100                 seq_printf(m, "%stransaction complete\n", prefix);
3101                 break;
3102         case BINDER_WORK_NODE:
3103                 node = container_of(w, struct binder_node, work);
3104                 seq_printf(m, "%snode work %d: u%p c%p\n",
3105                            prefix, node->debug_id, node->ptr, node->cookie);
3106                 break;
3107         case BINDER_WORK_DEAD_BINDER:
3108                 seq_printf(m, "%shas dead binder\n", prefix);
3109                 break;
3110         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3111                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3112                 break;
3113         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3114                 seq_printf(m, "%shas cleared death notification\n", prefix);
3115                 break;
3116         default:
3117                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3118                 break;
3119         }
3120 }
3121
3122 static void print_binder_thread(struct seq_file *m,
3123                                 struct binder_thread *thread,
3124                                 int print_always)
3125 {
3126         struct binder_transaction *t;
3127         struct binder_work *w;
3128         size_t start_pos = m->count;
3129         size_t header_pos;
3130
3131         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3132         header_pos = m->count;
3133         t = thread->transaction_stack;
3134         while (t) {
3135                 if (t->from == thread) {
3136                         print_binder_transaction(m,
3137                                                  "    outgoing transaction", t);
3138                         t = t->from_parent;
3139                 } else if (t->to_thread == thread) {
3140                         print_binder_transaction(m,
3141                                                  "    incoming transaction", t);
3142                         t = t->to_parent;
3143                 } else {
3144                         print_binder_transaction(m, "    bad transaction", t);
3145                         t = NULL;
3146                 }
3147         }
3148         list_for_each_entry(w, &thread->todo, entry) {
3149                 print_binder_work(m, "    ", "    pending transaction", w);
3150         }
3151         if (!print_always && m->count == header_pos)
3152                 m->count = start_pos;
3153 }
3154
3155 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3156 {
3157         struct binder_ref *ref;
3158         struct hlist_node *pos;
3159         struct binder_work *w;
3160         int count;
3161
3162         count = 0;
3163         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3164                 count++;
3165
3166         seq_printf(m, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3167                    node->debug_id, node->ptr, node->cookie,
3168                    node->has_strong_ref, node->has_weak_ref,
3169                    node->local_strong_refs, node->local_weak_refs,
3170                    node->internal_strong_refs, count);
3171         if (count) {
3172                 seq_puts(m, " proc");
3173                 hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3174                         seq_printf(m, " %d", ref->proc->pid);
3175         }
3176         seq_puts(m, "\n");
3177         list_for_each_entry(w, &node->async_todo, entry)
3178                 print_binder_work(m, "    ",
3179                                   "    pending async transaction", w);
3180 }
3181
3182 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3183 {
3184         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3185                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3186                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3187 }
3188
3189 static void print_binder_proc(struct seq_file *m,
3190                               struct binder_proc *proc, int print_all)
3191 {
3192         struct binder_work *w;
3193         struct rb_node *n;
3194         size_t start_pos = m->count;
3195         size_t header_pos;
3196
3197         seq_printf(m, "proc %d\n", proc->pid);
3198         header_pos = m->count;
3199
3200         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3201                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3202                                                 rb_node), print_all);
3203         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3204                 struct binder_node *node = rb_entry(n, struct binder_node,
3205                                                     rb_node);
3206                 if (print_all || node->has_async_transaction)
3207                         print_binder_node(m, node);
3208         }
3209         if (print_all) {
3210                 for (n = rb_first(&proc->refs_by_desc);
3211                      n != NULL;
3212                      n = rb_next(n))
3213                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3214                                                      rb_node_desc));
3215         }
3216         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3217                 print_binder_buffer(m, "  buffer",
3218                                     rb_entry(n, struct binder_buffer, rb_node));
3219         list_for_each_entry(w, &proc->todo, entry)
3220                 print_binder_work(m, "  ", "  pending transaction", w);
3221         list_for_each_entry(w, &proc->delivered_death, entry) {
3222                 seq_puts(m, "  has delivered dead binder\n");
3223                 break;
3224         }
3225         if (!print_all && m->count == header_pos)
3226                 m->count = start_pos;
3227 }
3228
3229 static const char *binder_return_strings[] = {
3230         "BR_ERROR",
3231         "BR_OK",
3232         "BR_TRANSACTION",
3233         "BR_REPLY",
3234         "BR_ACQUIRE_RESULT",
3235         "BR_DEAD_REPLY",
3236         "BR_TRANSACTION_COMPLETE",
3237         "BR_INCREFS",
3238         "BR_ACQUIRE",
3239         "BR_RELEASE",
3240         "BR_DECREFS",
3241         "BR_ATTEMPT_ACQUIRE",
3242         "BR_NOOP",
3243         "BR_SPAWN_LOOPER",
3244         "BR_FINISHED",
3245         "BR_DEAD_BINDER",
3246         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3247         "BR_FAILED_REPLY"
3248 };
3249
3250 static const char *binder_command_strings[] = {
3251         "BC_TRANSACTION",
3252         "BC_REPLY",
3253         "BC_ACQUIRE_RESULT",
3254         "BC_FREE_BUFFER",
3255         "BC_INCREFS",
3256         "BC_ACQUIRE",
3257         "BC_RELEASE",
3258         "BC_DECREFS",
3259         "BC_INCREFS_DONE",
3260         "BC_ACQUIRE_DONE",
3261         "BC_ATTEMPT_ACQUIRE",
3262         "BC_REGISTER_LOOPER",
3263         "BC_ENTER_LOOPER",
3264         "BC_EXIT_LOOPER",
3265         "BC_REQUEST_DEATH_NOTIFICATION",
3266         "BC_CLEAR_DEATH_NOTIFICATION",
3267         "BC_DEAD_BINDER_DONE"
3268 };
3269
3270 static const char *binder_objstat_strings[] = {
3271         "proc",
3272         "thread",
3273         "node",
3274         "ref",
3275         "death",
3276         "transaction",
3277         "transaction_complete"
3278 };
3279
3280 static void print_binder_stats(struct seq_file *m, const char *prefix,
3281                                struct binder_stats *stats)
3282 {
3283         int i;
3284
3285         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3286                      ARRAY_SIZE(binder_command_strings));
3287         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3288                 if (stats->bc[i])
3289                         seq_printf(m, "%s%s: %d\n", prefix,
3290                                    binder_command_strings[i], stats->bc[i]);
3291         }
3292
3293         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3294                      ARRAY_SIZE(binder_return_strings));
3295         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3296                 if (stats->br[i])
3297                         seq_printf(m, "%s%s: %d\n", prefix,
3298                                    binder_return_strings[i], stats->br[i]);
3299         }
3300
3301         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3302                      ARRAY_SIZE(binder_objstat_strings));
3303         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3304                      ARRAY_SIZE(stats->obj_deleted));
3305         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3306                 if (stats->obj_created[i] || stats->obj_deleted[i])
3307                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3308                                 binder_objstat_strings[i],
3309                                 stats->obj_created[i] - stats->obj_deleted[i],
3310                                 stats->obj_created[i]);
3311         }
3312 }
3313
3314 static void print_binder_proc_stats(struct seq_file *m,
3315                                     struct binder_proc *proc)
3316 {
3317         struct binder_work *w;
3318         struct rb_node *n;
3319         int count, strong, weak;
3320
3321         seq_printf(m, "proc %d\n", proc->pid);
3322         count = 0;
3323         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3324                 count++;
3325         seq_printf(m, "  threads: %d\n", count);
3326         seq_printf(m, "  requested threads: %d+%d/%d\n"
3327                         "  ready threads %d\n"
3328                         "  free async space %zd\n", proc->requested_threads,
3329                         proc->requested_threads_started, proc->max_threads,
3330                         proc->ready_threads, proc->free_async_space);
3331         count = 0;
3332         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3333                 count++;
3334         seq_printf(m, "  nodes: %d\n", count);
3335         count = 0;
3336         strong = 0;
3337         weak = 0;
3338         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3339                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3340                                                   rb_node_desc);
3341                 count++;
3342                 strong += ref->strong;
3343                 weak += ref->weak;
3344         }
3345         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3346
3347         count = 0;
3348         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3349                 count++;
3350         seq_printf(m, "  buffers: %d\n", count);
3351
3352         count = 0;
3353         list_for_each_entry(w, &proc->todo, entry) {
3354                 switch (w->type) {
3355                 case BINDER_WORK_TRANSACTION:
3356                         count++;
3357                         break;
3358                 default:
3359                         break;
3360                 }
3361         }
3362         seq_printf(m, "  pending transactions: %d\n", count);
3363
3364         print_binder_stats(m, "  ", &proc->stats);
3365 }
3366
3367
3368 static int binder_state_show(struct seq_file *m, void *unused)
3369 {
3370         struct binder_proc *proc;
3371         struct hlist_node *pos;
3372         struct binder_node *node;
3373         int do_lock = !binder_debug_no_lock;
3374
3375         if (do_lock)
3376                 binder_lock(__func__);
3377
3378         seq_puts(m, "binder state:\n");
3379
3380         if (!hlist_empty(&binder_dead_nodes))
3381                 seq_puts(m, "dead nodes:\n");
3382         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node)
3383                 print_binder_node(m, node);
3384
3385         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3386                 print_binder_proc(m, proc, 1);
3387         if (do_lock)
3388                 binder_unlock(__func__);
3389         return 0;
3390 }
3391
3392 static int binder_stats_show(struct seq_file *m, void *unused)
3393 {
3394         struct binder_proc *proc;
3395         struct hlist_node *pos;
3396         int do_lock = !binder_debug_no_lock;
3397
3398         if (do_lock)
3399                 binder_lock(__func__);
3400
3401         seq_puts(m, "binder stats:\n");
3402
3403         print_binder_stats(m, "", &binder_stats);
3404
3405         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3406                 print_binder_proc_stats(m, proc);
3407         if (do_lock)
3408                 binder_unlock(__func__);
3409         return 0;
3410 }
3411
3412 static int binder_transactions_show(struct seq_file *m, void *unused)
3413 {
3414         struct binder_proc *proc;
3415         struct hlist_node *pos;
3416         int do_lock = !binder_debug_no_lock;
3417
3418         if (do_lock)
3419                 binder_lock(__func__);
3420
3421         seq_puts(m, "binder transactions:\n");
3422         hlist_for_each_entry(proc, pos, &binder_procs, proc_node)
3423                 print_binder_proc(m, proc, 0);
3424         if (do_lock)
3425                 binder_unlock(__func__);
3426         return 0;
3427 }
3428
3429 static int binder_proc_show(struct seq_file *m, void *unused)
3430 {
3431         struct binder_proc *proc = m->private;
3432         int do_lock = !binder_debug_no_lock;
3433
3434         if (do_lock)
3435                 binder_lock(__func__);
3436         seq_puts(m, "binder proc state:\n");
3437         print_binder_proc(m, proc, 1);
3438         if (do_lock)
3439                 binder_unlock(__func__);
3440         return 0;
3441 }
3442
3443 static void print_binder_transaction_log_entry(struct seq_file *m,
3444                                         struct binder_transaction_log_entry *e)
3445 {
3446         seq_printf(m,
3447                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3448                    e->debug_id, (e->call_type == 2) ? "reply" :
3449                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3450                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3451                    e->target_handle, e->data_size, e->offsets_size);
3452 }
3453
3454 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3455 {
3456         struct binder_transaction_log *log = m->private;
3457         int i;
3458
3459         if (log->full) {
3460                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3461                         print_binder_transaction_log_entry(m, &log->entry[i]);
3462         }
3463         for (i = 0; i < log->next; i++)
3464                 print_binder_transaction_log_entry(m, &log->entry[i]);
3465         return 0;
3466 }
3467
3468 static const struct file_operations binder_fops = {
3469         .owner = THIS_MODULE,
3470         .poll = binder_poll,
3471         .unlocked_ioctl = binder_ioctl,
3472         .mmap = binder_mmap,
3473         .open = binder_open,
3474         .flush = binder_flush,
3475         .release = binder_release,
3476 };
3477
3478 static struct miscdevice binder_miscdev = {
3479         .minor = MISC_DYNAMIC_MINOR,
3480         .name = "binder",
3481         .fops = &binder_fops
3482 };
3483
3484 BINDER_DEBUG_ENTRY(state);
3485 BINDER_DEBUG_ENTRY(stats);
3486 BINDER_DEBUG_ENTRY(transactions);
3487 BINDER_DEBUG_ENTRY(transaction_log);
3488
3489 static int __init binder_init(void)
3490 {
3491         int ret;
3492
3493         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3494         if (!binder_deferred_workqueue)
3495                 return -ENOMEM;
3496
3497         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3498         if (binder_debugfs_dir_entry_root)
3499                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3500                                                  binder_debugfs_dir_entry_root);
3501         ret = misc_register(&binder_miscdev);
3502         if (binder_debugfs_dir_entry_root) {
3503                 debugfs_create_file("state",
3504                                     S_IRUGO,
3505                                     binder_debugfs_dir_entry_root,
3506                                     NULL,
3507                                     &binder_state_fops);
3508                 debugfs_create_file("stats",
3509                                     S_IRUGO,
3510                                     binder_debugfs_dir_entry_root,
3511                                     NULL,
3512                                     &binder_stats_fops);
3513                 debugfs_create_file("transactions",
3514                                     S_IRUGO,
3515                                     binder_debugfs_dir_entry_root,
3516                                     NULL,
3517                                     &binder_transactions_fops);
3518                 debugfs_create_file("transaction_log",
3519                                     S_IRUGO,
3520                                     binder_debugfs_dir_entry_root,
3521                                     &binder_transaction_log,
3522                                     &binder_transaction_log_fops);
3523                 debugfs_create_file("failed_transaction_log",
3524                                     S_IRUGO,
3525                                     binder_debugfs_dir_entry_root,
3526                                     &binder_transaction_log_failed,
3527                                     &binder_transaction_log_fops);
3528         }
3529         return ret;
3530 }
3531
3532 device_initcall(binder_init);
3533
3534 #define CREATE_TRACE_POINTS
3535 #include "binder_trace.h"
3536
3537 MODULE_LICENSE("GPL v2");