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