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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / drivers / staging / android / binder.c
blobeaec1dab7fe489fbbc9d171a4acdf5f78d765df6
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/freezer.h>
24 #include <linux/fs.h>
25 #include <linux/list.h>
26 #include <linux/miscdevice.h>
27 #include <linux/mm.h>
28 #include <linux/module.h>
29 #include <linux/mutex.h>
30 #include <linux/nsproxy.h>
31 #include <linux/poll.h>
32 #include <linux/debugfs.h>
33 #include <linux/rbtree.h>
34 #include <linux/sched.h>
35 #include <linux/seq_file.h>
36 #include <linux/uaccess.h>
37 #include <linux/vmalloc.h>
38 #include <linux/slab.h>
39 #include <linux/pid_namespace.h>
40
41 #include "binder.h"
42 #include "binder_trace.h"
43
44 static DEFINE_MUTEX(binder_main_lock);
45 static DEFINE_MUTEX(binder_deferred_lock);
46 static DEFINE_MUTEX(binder_mmap_lock);
47
48 static HLIST_HEAD(binder_procs);
49 static HLIST_HEAD(binder_deferred_list);
50 static HLIST_HEAD(binder_dead_nodes);
51
52 static struct dentry *binder_debugfs_dir_entry_root;
53 static struct dentry *binder_debugfs_dir_entry_proc;
54 static struct binder_node *binder_context_mgr_node;
55 static kuid_t binder_context_mgr_uid = INVALID_UID;
56 static int binder_last_id;
57 static struct workqueue_struct *binder_deferred_workqueue;
58
59 #define BINDER_DEBUG_ENTRY(name) \
60 static int binder_##name##_open(struct inode *inode, struct file *file) \
61 { \
62 return single_open(file, binder_##name##_show, inode->i_private); \
63 } \
64 \
65 static const struct file_operations binder_##name##_fops = { \
66 .owner = THIS_MODULE, \
67 .open = binder_##name##_open, \
68 .read = seq_read, \
69 .llseek = seq_lseek, \
70 .release = single_release, \
71 }
72
73 static int binder_proc_show(struct seq_file *m, void *unused);
74 BINDER_DEBUG_ENTRY(proc);
75
76 /* This is only defined in include/asm-arm/sizes.h */
77 #ifndef SZ_1K
78 #define SZ_1K 0x400
79 #endif
80
81 #ifndef SZ_4M
82 #define SZ_4M 0x400000
83 #endif
84
85 #define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
86
87 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
88
89 enum {
90 BINDER_DEBUG_USER_ERROR = 1U << 0,
91 BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
92 BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
93 BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
94 BINDER_DEBUG_DEAD_BINDER = 1U << 4,
95 BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
96 BINDER_DEBUG_READ_WRITE = 1U << 6,
97 BINDER_DEBUG_USER_REFS = 1U << 7,
98 BINDER_DEBUG_THREADS = 1U << 8,
99 BINDER_DEBUG_TRANSACTION = 1U << 9,
100 BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
101 BINDER_DEBUG_FREE_BUFFER = 1U << 11,
102 BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
103 BINDER_DEBUG_BUFFER_ALLOC = 1U << 13,
104 BINDER_DEBUG_PRIORITY_CAP = 1U << 14,
105 BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 15,
106 };
107 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
108 BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
109 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
110
111 static bool binder_debug_no_lock;
112 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
113
114 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
115 static int binder_stop_on_user_error;
116
117 static int binder_set_stop_on_user_error(const char *val,
118 struct kernel_param *kp)
119 {
120 int ret;
121 ret = param_set_int(val, kp);
122 if (binder_stop_on_user_error < 2)
123 wake_up(&binder_user_error_wait);
124 return ret;
125 }
126 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
127 param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
128
129 #define binder_debug(mask, x...) \
130 do { \
131 if (binder_debug_mask & mask) \
132 pr_info(x); \
133 } while (0)
134
135 #define binder_user_error(x...) \
136 do { \
137 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
138 pr_info(x); \
139 if (binder_stop_on_user_error) \
140 binder_stop_on_user_error = 2; \
141 } while (0)
142
143 enum binder_stat_types {
144 BINDER_STAT_PROC,
145 BINDER_STAT_THREAD,
146 BINDER_STAT_NODE,
147 BINDER_STAT_REF,
148 BINDER_STAT_DEATH,
149 BINDER_STAT_TRANSACTION,
150 BINDER_STAT_TRANSACTION_COMPLETE,
151 BINDER_STAT_COUNT
152 };
153
154 struct binder_stats {
155 int br[_IOC_NR(BR_FAILED_REPLY) + 1];
156 int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
157 int obj_created[BINDER_STAT_COUNT];
158 int obj_deleted[BINDER_STAT_COUNT];
159 };
160
161 static struct binder_stats binder_stats;
162
163 static inline void binder_stats_deleted(enum binder_stat_types type)
164 {
165 binder_stats.obj_deleted[type]++;
166 }
167
168 static inline void binder_stats_created(enum binder_stat_types type)
169 {
170 binder_stats.obj_created[type]++;
171 }
172
173 struct binder_transaction_log_entry {
174 int debug_id;
175 int call_type;
176 int from_proc;
177 int from_thread;
178 int target_handle;
179 int to_proc;
180 int to_thread;
181 int to_node;
182 int data_size;
183 int offsets_size;
184 };
185 struct binder_transaction_log {
186 int next;
187 int full;
188 struct binder_transaction_log_entry entry[32];
189 };
190 static struct binder_transaction_log binder_transaction_log;
191 static struct binder_transaction_log binder_transaction_log_failed;
192
193 static struct binder_transaction_log_entry *binder_transaction_log_add(
194 struct binder_transaction_log *log)
195 {
196 struct binder_transaction_log_entry *e;
197 e = &log->entry[log->next];
198 memset(e, 0, sizeof(*e));
199 log->next++;
200 if (log->next == ARRAY_SIZE(log->entry)) {
201 log->next = 0;
202 log->full = 1;
203 }
204 return e;
205 }
206
207 struct binder_work {
208 struct list_head entry;
209 enum {
210 BINDER_WORK_TRANSACTION = 1,
211 BINDER_WORK_TRANSACTION_COMPLETE,
212 BINDER_WORK_NODE,
213 BINDER_WORK_DEAD_BINDER,
214 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
215 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
216 } type;
217 };
218
219 struct binder_node {
220 int debug_id;
221 struct binder_work work;
222 union {
223 struct rb_node rb_node;
224 struct hlist_node dead_node;
225 };
226 struct binder_proc *proc;
227 struct hlist_head refs;
228 int internal_strong_refs;
229 int local_weak_refs;
230 int local_strong_refs;
231 void __user *ptr;
232 void __user *cookie;
233 unsigned has_strong_ref:1;
234 unsigned pending_strong_ref:1;
235 unsigned has_weak_ref:1;
236 unsigned pending_weak_ref:1;
237 unsigned has_async_transaction:1;
238 unsigned accept_fds:1;
239 unsigned min_priority:8;
240 struct list_head async_todo;
241 };
242
243 struct binder_ref_death {
244 struct binder_work work;
245 void __user *cookie;
246 };
247
248 struct binder_ref {
249 /* Lookups needed: */
250 /* node + proc => ref (transaction) */
251 /* desc + proc => ref (transaction, inc/dec ref) */
252 /* node => refs + procs (proc exit) */
253 int debug_id;
254 struct rb_node rb_node_desc;
255 struct rb_node rb_node_node;
256 struct hlist_node node_entry;
257 struct binder_proc *proc;
258 struct binder_node *node;
259 uint32_t desc;
260 int strong;
261 int weak;
262 struct binder_ref_death *death;
263 };
264
265 struct binder_buffer {
266 struct list_head entry; /* free and allocated entries by address */
267 struct rb_node rb_node; /* free entry by size or allocated entry */
268 /* by address */
269 unsigned free:1;
270 unsigned allow_user_free:1;
271 unsigned async_transaction:1;
272 unsigned debug_id:29;
273
274 struct binder_transaction *transaction;
275
276 struct binder_node *target_node;
277 size_t data_size;
278 size_t offsets_size;
279 uint8_t data[0];
280 };
281
282 enum binder_deferred_state {
283 BINDER_DEFERRED_PUT_FILES = 0x01,
284 BINDER_DEFERRED_FLUSH = 0x02,
285 BINDER_DEFERRED_RELEASE = 0x04,
286 };
287
288 struct binder_proc {
289 struct hlist_node proc_node;
290 struct rb_root threads;
291 struct rb_root nodes;
292 struct rb_root refs_by_desc;
293 struct rb_root refs_by_node;
294 int pid;
295 struct vm_area_struct *vma;
296 struct mm_struct *vma_vm_mm;
297 struct task_struct *tsk;
298 struct files_struct *files;
299 struct hlist_node deferred_work_node;
300 int deferred_work;
301 void *buffer;
302 ptrdiff_t user_buffer_offset;
303
304 struct list_head buffers;
305 struct rb_root free_buffers;
306 struct rb_root allocated_buffers;
307 size_t free_async_space;
308
309 struct page **pages;
310 size_t buffer_size;
311 uint32_t buffer_free;
312 struct list_head todo;
313 wait_queue_head_t wait;
314 struct binder_stats stats;
315 struct list_head delivered_death;
316 int max_threads;
317 int requested_threads;
318 int requested_threads_started;
319 int ready_threads;
320 long default_priority;
321 struct dentry *debugfs_entry;
322 };
323
324 enum {
325 BINDER_LOOPER_STATE_REGISTERED = 0x01,
326 BINDER_LOOPER_STATE_ENTERED = 0x02,
327 BINDER_LOOPER_STATE_EXITED = 0x04,
328 BINDER_LOOPER_STATE_INVALID = 0x08,
329 BINDER_LOOPER_STATE_WAITING = 0x10,
330 BINDER_LOOPER_STATE_NEED_RETURN = 0x20
331 };
332
333 struct binder_thread {
334 struct binder_proc *proc;
335 struct rb_node rb_node;
336 int pid;
337 int looper;
338 struct binder_transaction *transaction_stack;
339 struct list_head todo;
340 uint32_t return_error; /* Write failed, return error code in read buf */
341 uint32_t return_error2; /* Write failed, return error code in read */
342 /* buffer. Used when sending a reply to a dead process that */
343 /* we are also waiting on */
344 wait_queue_head_t wait;
345 struct binder_stats stats;
346 };
347
348 struct binder_transaction {
349 int debug_id;
350 struct binder_work work;
351 struct binder_thread *from;
352 struct binder_transaction *from_parent;
353 struct binder_proc *to_proc;
354 struct binder_thread *to_thread;
355 struct binder_transaction *to_parent;
356 unsigned need_reply:1;
357 /* unsigned is_dead:1; */ /* not used at the moment */
358
359 struct binder_buffer *buffer;
360 unsigned int code;
361 unsigned int flags;
362 long priority;
363 long saved_priority;
364 kuid_t sender_euid;
365 };
366
367 static void
368 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
369
370 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
371 {
372 struct files_struct *files = proc->files;
373 unsigned long rlim_cur;
374 unsigned long irqs;
375
376 if (files == NULL)
377 return -ESRCH;
378
379 if (!lock_task_sighand(proc->tsk, &irqs))
380 return -EMFILE;
381
382 rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
383 unlock_task_sighand(proc->tsk, &irqs);
384
385 return __alloc_fd(files, 0, rlim_cur, flags);
386 }
387
388 /*
389 * copied from fd_install
390 */
391 static void task_fd_install(
392 struct binder_proc *proc, unsigned int fd, struct file *file)
393 {
394 if (proc->files)
395 __fd_install(proc->files, fd, file);
396 }
397
398 /*
399 * copied from sys_close
400 */
401 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
402 {
403 int retval;
404
405 if (proc->files == NULL)
406 return -ESRCH;
407
408 retval = __close_fd(proc->files, fd);
409 /* can't restart close syscall because file table entry was cleared */
410 if (unlikely(retval == -ERESTARTSYS ||
411 retval == -ERESTARTNOINTR ||
412 retval == -ERESTARTNOHAND ||
413 retval == -ERESTART_RESTARTBLOCK))
414 retval = -EINTR;
415
416 return retval;
417 }
418
419 static inline void binder_lock(const char *tag)
420 {
421 trace_binder_lock(tag);
422 mutex_lock(&binder_main_lock);
423 trace_binder_locked(tag);
424 }
425
426 static inline void binder_unlock(const char *tag)
427 {
428 trace_binder_unlock(tag);
429 mutex_unlock(&binder_main_lock);
430 }
431
432 static void binder_set_nice(long nice)
433 {
434 long min_nice;
435 if (can_nice(current, nice)) {
436 set_user_nice(current, nice);
437 return;
438 }
439 min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
440 binder_debug(BINDER_DEBUG_PRIORITY_CAP,
441 "%d: nice value %ld not allowed use %ld instead\n",
442 current->pid, nice, min_nice);
443 set_user_nice(current, min_nice);
444 if (min_nice < 20)
445 return;
446 binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
447 }
448
449 static size_t binder_buffer_size(struct binder_proc *proc,
450 struct binder_buffer *buffer)
451 {
452 if (list_is_last(&buffer->entry, &proc->buffers))
453 return proc->buffer + proc->buffer_size - (void *)buffer->data;
454 else
455 return (size_t)list_entry(buffer->entry.next,
456 struct binder_buffer, entry) - (size_t)buffer->data;
457 }
458
459 static void binder_insert_free_buffer(struct binder_proc *proc,
460 struct binder_buffer *new_buffer)
461 {
462 struct rb_node **p = &proc->free_buffers.rb_node;
463 struct rb_node *parent = NULL;
464 struct binder_buffer *buffer;
465 size_t buffer_size;
466 size_t new_buffer_size;
467
468 BUG_ON(!new_buffer->free);
469
470 new_buffer_size = binder_buffer_size(proc, new_buffer);
471
472 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
473 "%d: add free buffer, size %zd, at %p\n",
474 proc->pid, new_buffer_size, new_buffer);
475
476 while (*p) {
477 parent = *p;
478 buffer = rb_entry(parent, struct binder_buffer, rb_node);
479 BUG_ON(!buffer->free);
480
481 buffer_size = binder_buffer_size(proc, buffer);
482
483 if (new_buffer_size < buffer_size)
484 p = &parent->rb_left;
485 else
486 p = &parent->rb_right;
487 }
488 rb_link_node(&new_buffer->rb_node, parent, p);
489 rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
490 }
491
492 static void binder_insert_allocated_buffer(struct binder_proc *proc,
493 struct binder_buffer *new_buffer)
494 {
495 struct rb_node **p = &proc->allocated_buffers.rb_node;
496 struct rb_node *parent = NULL;
497 struct binder_buffer *buffer;
498
499 BUG_ON(new_buffer->free);
500
501 while (*p) {
502 parent = *p;
503 buffer = rb_entry(parent, struct binder_buffer, rb_node);
504 BUG_ON(buffer->free);
505
506 if (new_buffer < buffer)
507 p = &parent->rb_left;
508 else if (new_buffer > buffer)
509 p = &parent->rb_right;
510 else
511 BUG();
512 }
513 rb_link_node(&new_buffer->rb_node, parent, p);
514 rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
515 }
516
517 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
518 void __user *user_ptr)
519 {
520 struct rb_node *n = proc->allocated_buffers.rb_node;
521 struct binder_buffer *buffer;
522 struct binder_buffer *kern_ptr;
523
524 kern_ptr = user_ptr - proc->user_buffer_offset
525 - offsetof(struct binder_buffer, data);
526
527 while (n) {
528 buffer = rb_entry(n, struct binder_buffer, rb_node);
529 BUG_ON(buffer->free);
530
531 if (kern_ptr < buffer)
532 n = n->rb_left;
533 else if (kern_ptr > buffer)
534 n = n->rb_right;
535 else
536 return buffer;
537 }
538 return NULL;
539 }
540
541 static int binder_update_page_range(struct binder_proc *proc, int allocate,
542 void *start, void *end,
543 struct vm_area_struct *vma)
544 {
545 void *page_addr;
546 unsigned long user_page_addr;
547 struct vm_struct tmp_area;
548 struct page **page;
549 struct mm_struct *mm;
550
551 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
552 "%d: %s pages %p-%p\n", proc->pid,
553 allocate ? "allocate" : "free", start, end);
554
555 if (end <= start)
556 return 0;
557
558 trace_binder_update_page_range(proc, allocate, start, end);
559
560 if (vma)
561 mm = NULL;
562 else
563 mm = get_task_mm(proc->tsk);
564
565 if (mm) {
566 down_write(&mm->mmap_sem);
567 vma = proc->vma;
568 if (vma && mm != proc->vma_vm_mm) {
569 pr_err("%d: vma mm and task mm mismatch\n",
570 proc->pid);
571 vma = NULL;
572 }
573 }
574
575 if (allocate == 0)
576 goto free_range;
577
578 if (vma == NULL) {
579 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
580 proc->pid);
581 goto err_no_vma;
582 }
583
584 for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
585 int ret;
586 struct page **page_array_ptr;
587 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
588
589 BUG_ON(*page);
590 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
591 if (*page == NULL) {
592 pr_err("%d: binder_alloc_buf failed for page at %p\n",
593 proc->pid, page_addr);
594 goto err_alloc_page_failed;
595 }
596 tmp_area.addr = page_addr;
597 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
598 page_array_ptr = page;
599 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
600 if (ret) {
601 pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
602 proc->pid, page_addr);
603 goto err_map_kernel_failed;
604 }
605 user_page_addr =
606 (uintptr_t)page_addr + proc->user_buffer_offset;
607 ret = vm_insert_page(vma, user_page_addr, page[0]);
608 if (ret) {
609 pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
610 proc->pid, user_page_addr);
611 goto err_vm_insert_page_failed;
612 }
613 /* vm_insert_page does not seem to increment the refcount */
614 }
615 if (mm) {
616 up_write(&mm->mmap_sem);
617 mmput(mm);
618 }
619 return 0;
620
621 free_range:
622 for (page_addr = end - PAGE_SIZE; page_addr >= start;
623 page_addr -= PAGE_SIZE) {
624 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
625 if (vma)
626 zap_page_range(vma, (uintptr_t)page_addr +
627 proc->user_buffer_offset, PAGE_SIZE, NULL);
628 err_vm_insert_page_failed:
629 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
630 err_map_kernel_failed:
631 __free_page(*page);
632 *page = NULL;
633 err_alloc_page_failed:
634 ;
635 }
636 err_no_vma:
637 if (mm) {
638 up_write(&mm->mmap_sem);
639 mmput(mm);
640 }
641 return -ENOMEM;
642 }
643
644 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
645 size_t data_size,
646 size_t offsets_size, int is_async)
647 {
648 struct rb_node *n = proc->free_buffers.rb_node;
649 struct binder_buffer *buffer;
650 size_t buffer_size;
651 struct rb_node *best_fit = NULL;
652 void *has_page_addr;
653 void *end_page_addr;
654 size_t size;
655
656 if (proc->vma == NULL) {
657 pr_err("%d: binder_alloc_buf, no vma\n",
658 proc->pid);
659 return NULL;
660 }
661
662 size = ALIGN(data_size, sizeof(void *)) +
663 ALIGN(offsets_size, sizeof(void *));
664
665 if (size < data_size || size < offsets_size) {
666 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
667 proc->pid, data_size, offsets_size);
668 return NULL;
669 }
670
671 if (is_async &&
672 proc->free_async_space < size + sizeof(struct binder_buffer)) {
673 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
674 "%d: binder_alloc_buf size %zd failed, no async space left\n",
675 proc->pid, size);
676 return NULL;
677 }
678
679 while (n) {
680 buffer = rb_entry(n, struct binder_buffer, rb_node);
681 BUG_ON(!buffer->free);
682 buffer_size = binder_buffer_size(proc, buffer);
683
684 if (size < buffer_size) {
685 best_fit = n;
686 n = n->rb_left;
687 } else if (size > buffer_size)
688 n = n->rb_right;
689 else {
690 best_fit = n;
691 break;
692 }
693 }
694 if (best_fit == NULL) {
695 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
696 proc->pid, size);
697 return NULL;
698 }
699 if (n == NULL) {
700 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
701 buffer_size = binder_buffer_size(proc, buffer);
702 }
703
704 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
705 "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
706 proc->pid, size, buffer, buffer_size);
707
708 has_page_addr =
709 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
710 if (n == NULL) {
711 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
712 buffer_size = size; /* no room for other buffers */
713 else
714 buffer_size = size + sizeof(struct binder_buffer);
715 }
716 end_page_addr =
717 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
718 if (end_page_addr > has_page_addr)
719 end_page_addr = has_page_addr;
720 if (binder_update_page_range(proc, 1,
721 (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
722 return NULL;
723
724 rb_erase(best_fit, &proc->free_buffers);
725 buffer->free = 0;
726 binder_insert_allocated_buffer(proc, buffer);
727 if (buffer_size != size) {
728 struct binder_buffer *new_buffer = (void *)buffer->data + size;
729 list_add(&new_buffer->entry, &buffer->entry);
730 new_buffer->free = 1;
731 binder_insert_free_buffer(proc, new_buffer);
732 }
733 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
734 "%d: binder_alloc_buf size %zd got %p\n",
735 proc->pid, size, buffer);
736 buffer->data_size = data_size;
737 buffer->offsets_size = offsets_size;
738 buffer->async_transaction = is_async;
739 if (is_async) {
740 proc->free_async_space -= size + sizeof(struct binder_buffer);
741 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
742 "%d: binder_alloc_buf size %zd async free %zd\n",
743 proc->pid, size, proc->free_async_space);
744 }
745
746 return buffer;
747 }
748
749 static void *buffer_start_page(struct binder_buffer *buffer)
750 {
751 return (void *)((uintptr_t)buffer & PAGE_MASK);
752 }
753
754 static void *buffer_end_page(struct binder_buffer *buffer)
755 {
756 return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
757 }
758
759 static void binder_delete_free_buffer(struct binder_proc *proc,
760 struct binder_buffer *buffer)
761 {
762 struct binder_buffer *prev, *next = NULL;
763 int free_page_end = 1;
764 int free_page_start = 1;
765
766 BUG_ON(proc->buffers.next == &buffer->entry);
767 prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
768 BUG_ON(!prev->free);
769 if (buffer_end_page(prev) == buffer_start_page(buffer)) {
770 free_page_start = 0;
771 if (buffer_end_page(prev) == buffer_end_page(buffer))
772 free_page_end = 0;
773 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
774 "%d: merge free, buffer %p share page with %p\n",
775 proc->pid, buffer, prev);
776 }
777
778 if (!list_is_last(&buffer->entry, &proc->buffers)) {
779 next = list_entry(buffer->entry.next,
780 struct binder_buffer, entry);
781 if (buffer_start_page(next) == buffer_end_page(buffer)) {
782 free_page_end = 0;
783 if (buffer_start_page(next) ==
784 buffer_start_page(buffer))
785 free_page_start = 0;
786 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
787 "%d: merge free, buffer %p share page with %p\n",
788 proc->pid, buffer, prev);
789 }
790 }
791 list_del(&buffer->entry);
792 if (free_page_start || free_page_end) {
793 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
794 "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
795 proc->pid, buffer, free_page_start ? "" : " end",
796 free_page_end ? "" : " start", prev, next);
797 binder_update_page_range(proc, 0, free_page_start ?
798 buffer_start_page(buffer) : buffer_end_page(buffer),
799 (free_page_end ? buffer_end_page(buffer) :
800 buffer_start_page(buffer)) + PAGE_SIZE, NULL);
801 }
802 }
803
804 static void binder_free_buf(struct binder_proc *proc,
805 struct binder_buffer *buffer)
806 {
807 size_t size, buffer_size;
808
809 buffer_size = binder_buffer_size(proc, buffer);
810
811 size = ALIGN(buffer->data_size, sizeof(void *)) +
812 ALIGN(buffer->offsets_size, sizeof(void *));
813
814 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
815 "%d: binder_free_buf %p size %zd buffer_size %zd\n",
816 proc->pid, buffer, size, buffer_size);
817
818 BUG_ON(buffer->free);
819 BUG_ON(size > buffer_size);
820 BUG_ON(buffer->transaction != NULL);
821 BUG_ON((void *)buffer < proc->buffer);
822 BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
823
824 if (buffer->async_transaction) {
825 proc->free_async_space += size + sizeof(struct binder_buffer);
826
827 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
828 "%d: binder_free_buf size %zd async free %zd\n",
829 proc->pid, size, proc->free_async_space);
830 }
831
832 binder_update_page_range(proc, 0,
833 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
834 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
835 NULL);
836 rb_erase(&buffer->rb_node, &proc->allocated_buffers);
837 buffer->free = 1;
838 if (!list_is_last(&buffer->entry, &proc->buffers)) {
839 struct binder_buffer *next = list_entry(buffer->entry.next,
840 struct binder_buffer, entry);
841 if (next->free) {
842 rb_erase(&next->rb_node, &proc->free_buffers);
843 binder_delete_free_buffer(proc, next);
844 }
845 }
846 if (proc->buffers.next != &buffer->entry) {
847 struct binder_buffer *prev = list_entry(buffer->entry.prev,
848 struct binder_buffer, entry);
849 if (prev->free) {
850 binder_delete_free_buffer(proc, buffer);
851 rb_erase(&prev->rb_node, &proc->free_buffers);
852 buffer = prev;
853 }
854 }
855 binder_insert_free_buffer(proc, buffer);
856 }
857
858 static struct binder_node *binder_get_node(struct binder_proc *proc,
859 void __user *ptr)
860 {
861 struct rb_node *n = proc->nodes.rb_node;
862 struct binder_node *node;
863
864 while (n) {
865 node = rb_entry(n, struct binder_node, rb_node);
866
867 if (ptr < node->ptr)
868 n = n->rb_left;
869 else if (ptr > node->ptr)
870 n = n->rb_right;
871 else
872 return node;
873 }
874 return NULL;
875 }
876
877 static struct binder_node *binder_new_node(struct binder_proc *proc,
878 void __user *ptr,
879 void __user *cookie)
880 {
881 struct rb_node **p = &proc->nodes.rb_node;
882 struct rb_node *parent = NULL;
883 struct binder_node *node;
884
885 while (*p) {
886 parent = *p;
887 node = rb_entry(parent, struct binder_node, rb_node);
888
889 if (ptr < node->ptr)
890 p = &(*p)->rb_left;
891 else if (ptr > node->ptr)
892 p = &(*p)->rb_right;
893 else
894 return NULL;
895 }
896
897 node = kzalloc(sizeof(*node), GFP_KERNEL);
898 if (node == NULL)
899 return NULL;
900 binder_stats_created(BINDER_STAT_NODE);
901 rb_link_node(&node->rb_node, parent, p);
902 rb_insert_color(&node->rb_node, &proc->nodes);
903 node->debug_id = ++binder_last_id;
904 node->proc = proc;
905 node->ptr = ptr;
906 node->cookie = cookie;
907 node->work.type = BINDER_WORK_NODE;
908 INIT_LIST_HEAD(&node->work.entry);
909 INIT_LIST_HEAD(&node->async_todo);
910 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
911 "%d:%d node %d u%p c%p created\n",
912 proc->pid, current->pid, node->debug_id,
913 node->ptr, node->cookie);
914 return node;
915 }
916
917 static int binder_inc_node(struct binder_node *node, int strong, int internal,
918 struct list_head *target_list)
919 {
920 if (strong) {
921 if (internal) {
922 if (target_list == NULL &&
923 node->internal_strong_refs == 0 &&
924 !(node == binder_context_mgr_node &&
925 node->has_strong_ref)) {
926 pr_err("invalid inc strong node for %d\n",
927 node->debug_id);
928 return -EINVAL;
929 }
930 node->internal_strong_refs++;
931 } else
932 node->local_strong_refs++;
933 if (!node->has_strong_ref && target_list) {
934 list_del_init(&node->work.entry);
935 list_add_tail(&node->work.entry, target_list);
936 }
937 } else {
938 if (!internal)
939 node->local_weak_refs++;
940 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
941 if (target_list == NULL) {
942 pr_err("invalid inc weak node for %d\n",
943 node->debug_id);
944 return -EINVAL;
945 }
946 list_add_tail(&node->work.entry, target_list);
947 }
948 }
949 return 0;
950 }
951
952 static int binder_dec_node(struct binder_node *node, int strong, int internal)
953 {
954 if (strong) {
955 if (internal)
956 node->internal_strong_refs--;
957 else
958 node->local_strong_refs--;
959 if (node->local_strong_refs || node->internal_strong_refs)
960 return 0;
961 } else {
962 if (!internal)
963 node->local_weak_refs--;
964 if (node->local_weak_refs || !hlist_empty(&node->refs))
965 return 0;
966 }
967 if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
968 if (list_empty(&node->work.entry)) {
969 list_add_tail(&node->work.entry, &node->proc->todo);
970 wake_up_interruptible(&node->proc->wait);
971 }
972 } else {
973 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
974 !node->local_weak_refs) {
975 list_del_init(&node->work.entry);
976 if (node->proc) {
977 rb_erase(&node->rb_node, &node->proc->nodes);
978 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
979 "refless node %d deleted\n",
980 node->debug_id);
981 } else {
982 hlist_del(&node->dead_node);
983 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
984 "dead node %d deleted\n",
985 node->debug_id);
986 }
987 kfree(node);
988 binder_stats_deleted(BINDER_STAT_NODE);
989 }
990 }
991
992 return 0;
993 }
994
995
996 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
997 uint32_t desc)
998 {
999 struct rb_node *n = proc->refs_by_desc.rb_node;
1000 struct binder_ref *ref;
1001
1002 while (n) {
1003 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1004
1005 if (desc < ref->desc)
1006 n = n->rb_left;
1007 else if (desc > ref->desc)
1008 n = n->rb_right;
1009 else
1010 return ref;
1011 }
1012 return NULL;
1013 }
1014
1015 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1016 struct binder_node *node)
1017 {
1018 struct rb_node *n;
1019 struct rb_node **p = &proc->refs_by_node.rb_node;
1020 struct rb_node *parent = NULL;
1021 struct binder_ref *ref, *new_ref;
1022
1023 while (*p) {
1024 parent = *p;
1025 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1026
1027 if (node < ref->node)
1028 p = &(*p)->rb_left;
1029 else if (node > ref->node)
1030 p = &(*p)->rb_right;
1031 else
1032 return ref;
1033 }
1034 new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1035 if (new_ref == NULL)
1036 return NULL;
1037 binder_stats_created(BINDER_STAT_REF);
1038 new_ref->debug_id = ++binder_last_id;
1039 new_ref->proc = proc;
1040 new_ref->node = node;
1041 rb_link_node(&new_ref->rb_node_node, parent, p);
1042 rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1043
1044 new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1045 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1046 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1047 if (ref->desc > new_ref->desc)
1048 break;
1049 new_ref->desc = ref->desc + 1;
1050 }
1051
1052 p = &proc->refs_by_desc.rb_node;
1053 while (*p) {
1054 parent = *p;
1055 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1056
1057 if (new_ref->desc < ref->desc)
1058 p = &(*p)->rb_left;
1059 else if (new_ref->desc > ref->desc)
1060 p = &(*p)->rb_right;
1061 else
1062 BUG();
1063 }
1064 rb_link_node(&new_ref->rb_node_desc, parent, p);
1065 rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1066 if (node) {
1067 hlist_add_head(&new_ref->node_entry, &node->refs);
1068
1069 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1070 "%d new ref %d desc %d for node %d\n",
1071 proc->pid, new_ref->debug_id, new_ref->desc,
1072 node->debug_id);
1073 } else {
1074 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1075 "%d new ref %d desc %d for dead node\n",
1076 proc->pid, new_ref->debug_id, new_ref->desc);
1077 }
1078 return new_ref;
1079 }
1080
1081 static void binder_delete_ref(struct binder_ref *ref)
1082 {
1083 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1084 "%d delete ref %d desc %d for node %d\n",
1085 ref->proc->pid, ref->debug_id, ref->desc,
1086 ref->node->debug_id);
1087
1088 rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1089 rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1090 if (ref->strong)
1091 binder_dec_node(ref->node, 1, 1);
1092 hlist_del(&ref->node_entry);
1093 binder_dec_node(ref->node, 0, 1);
1094 if (ref->death) {
1095 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1096 "%d delete ref %d desc %d has death notification\n",
1097 ref->proc->pid, ref->debug_id, ref->desc);
1098 list_del(&ref->death->work.entry);
1099 kfree(ref->death);
1100 binder_stats_deleted(BINDER_STAT_DEATH);
1101 }
1102 kfree(ref);
1103 binder_stats_deleted(BINDER_STAT_REF);
1104 }
1105
1106 static int binder_inc_ref(struct binder_ref *ref, int strong,
1107 struct list_head *target_list)
1108 {
1109 int ret;
1110 if (strong) {
1111 if (ref->strong == 0) {
1112 ret = binder_inc_node(ref->node, 1, 1, target_list);
1113 if (ret)
1114 return ret;
1115 }
1116 ref->strong++;
1117 } else {
1118 if (ref->weak == 0) {
1119 ret = binder_inc_node(ref->node, 0, 1, target_list);
1120 if (ret)
1121 return ret;
1122 }
1123 ref->weak++;
1124 }
1125 return 0;
1126 }
1127
1128
1129 static int binder_dec_ref(struct binder_ref *ref, int strong)
1130 {
1131 if (strong) {
1132 if (ref->strong == 0) {
1133 binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1134 ref->proc->pid, ref->debug_id,
1135 ref->desc, ref->strong, ref->weak);
1136 return -EINVAL;
1137 }
1138 ref->strong--;
1139 if (ref->strong == 0) {
1140 int ret;
1141 ret = binder_dec_node(ref->node, strong, 1);
1142 if (ret)
1143 return ret;
1144 }
1145 } else {
1146 if (ref->weak == 0) {
1147 binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1148 ref->proc->pid, ref->debug_id,
1149 ref->desc, ref->strong, ref->weak);
1150 return -EINVAL;
1151 }
1152 ref->weak--;
1153 }
1154 if (ref->strong == 0 && ref->weak == 0)
1155 binder_delete_ref(ref);
1156 return 0;
1157 }
1158
1159 static void binder_pop_transaction(struct binder_thread *target_thread,
1160 struct binder_transaction *t)
1161 {
1162 if (target_thread) {
1163 BUG_ON(target_thread->transaction_stack != t);
1164 BUG_ON(target_thread->transaction_stack->from != target_thread);
1165 target_thread->transaction_stack =
1166 target_thread->transaction_stack->from_parent;
1167 t->from = NULL;
1168 }
1169 t->need_reply = 0;
1170 if (t->buffer)
1171 t->buffer->transaction = NULL;
1172 kfree(t);
1173 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1174 }
1175
1176 static void binder_send_failed_reply(struct binder_transaction *t,
1177 uint32_t error_code)
1178 {
1179 struct binder_thread *target_thread;
1180 BUG_ON(t->flags & TF_ONE_WAY);
1181 while (1) {
1182 target_thread = t->from;
1183 if (target_thread) {
1184 if (target_thread->return_error != BR_OK &&
1185 target_thread->return_error2 == BR_OK) {
1186 target_thread->return_error2 =
1187 target_thread->return_error;
1188 target_thread->return_error = BR_OK;
1189 }
1190 if (target_thread->return_error == BR_OK) {
1191 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1192 "send failed reply for transaction %d to %d:%d\n",
1193 t->debug_id, target_thread->proc->pid,
1194 target_thread->pid);
1195
1196 binder_pop_transaction(target_thread, t);
1197 target_thread->return_error = error_code;
1198 wake_up_interruptible(&target_thread->wait);
1199 } else {
1200 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1201 target_thread->proc->pid,
1202 target_thread->pid,
1203 target_thread->return_error);
1204 }
1205 return;
1206 } else {
1207 struct binder_transaction *next = t->from_parent;
1208
1209 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1210 "send failed reply for transaction %d, target dead\n",
1211 t->debug_id);
1212
1213 binder_pop_transaction(target_thread, t);
1214 if (next == NULL) {
1215 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1216 "reply failed, no target thread at root\n");
1217 return;
1218 }
1219 t = next;
1220 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1221 "reply failed, no target thread -- retry %d\n",
1222 t->debug_id);
1223 }
1224 }
1225 }
1226
1227 static void binder_transaction_buffer_release(struct binder_proc *proc,
1228 struct binder_buffer *buffer,
1229 size_t *failed_at)
1230 {
1231 size_t *offp, *off_end;
1232 int debug_id = buffer->debug_id;
1233
1234 binder_debug(BINDER_DEBUG_TRANSACTION,
1235 "%d buffer release %d, size %zd-%zd, failed at %p\n",
1236 proc->pid, buffer->debug_id,
1237 buffer->data_size, buffer->offsets_size, failed_at);
1238
1239 if (buffer->target_node)
1240 binder_dec_node(buffer->target_node, 1, 0);
1241
1242 offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1243 if (failed_at)
1244 off_end = failed_at;
1245 else
1246 off_end = (void *)offp + buffer->offsets_size;
1247 for (; offp < off_end; offp++) {
1248 struct flat_binder_object *fp;
1249 if (*offp > buffer->data_size - sizeof(*fp) ||
1250 buffer->data_size < sizeof(*fp) ||
1251 !IS_ALIGNED(*offp, sizeof(u32))) {
1252 pr_err("transaction release %d bad offset %zd, size %zd\n",
1253 debug_id, *offp, buffer->data_size);
1254 continue;
1255 }
1256 fp = (struct flat_binder_object *)(buffer->data + *offp);
1257 switch (fp->type) {
1258 case BINDER_TYPE_BINDER:
1259 case BINDER_TYPE_WEAK_BINDER: {
1260 struct binder_node *node = binder_get_node(proc, fp->binder);
1261 if (node == NULL) {
1262 pr_err("transaction release %d bad node %p\n",
1263 debug_id, fp->binder);
1264 break;
1265 }
1266 binder_debug(BINDER_DEBUG_TRANSACTION,
1267 " node %d u%p\n",
1268 node->debug_id, node->ptr);
1269 binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1270 } break;
1271 case BINDER_TYPE_HANDLE:
1272 case BINDER_TYPE_WEAK_HANDLE: {
1273 struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1274 if (ref == NULL) {
1275 pr_err("transaction release %d bad handle %d\n",
1276 debug_id, fp->handle);
1277 break;
1278 }
1279 binder_debug(BINDER_DEBUG_TRANSACTION,
1280 " ref %d desc %d (node %d)\n",
1281 ref->debug_id, ref->desc, ref->node->debug_id);
1282 binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1283 } break;
1284
1285 case BINDER_TYPE_FD:
1286 binder_debug(BINDER_DEBUG_TRANSACTION,
1287 " fd %d\n", fp->handle);
1288 if (failed_at)
1289 task_close_fd(proc, fp->handle);
1290 break;
1291
1292 default:
1293 pr_err("transaction release %d bad object type %x\n",
1294 debug_id, fp->type);
1295 break;
1296 }
1297 }
1298 }
1299
1300 static void binder_transaction(struct binder_proc *proc,
1301 struct binder_thread *thread,
1302 struct binder_transaction_data *tr, int reply)
1303 {
1304 struct binder_transaction *t;
1305 struct binder_work *tcomplete;
1306 size_t *offp, *off_end;
1307 struct binder_proc *target_proc;
1308 struct binder_thread *target_thread = NULL;
1309 struct binder_node *target_node = NULL;
1310 struct list_head *target_list;
1311 wait_queue_head_t *target_wait;
1312 struct binder_transaction *in_reply_to = NULL;
1313 struct binder_transaction_log_entry *e;
1314 uint32_t return_error;
1315
1316 e = binder_transaction_log_add(&binder_transaction_log);
1317 e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1318 e->from_proc = proc->pid;
1319 e->from_thread = thread->pid;
1320 e->target_handle = tr->target.handle;
1321 e->data_size = tr->data_size;
1322 e->offsets_size = tr->offsets_size;
1323
1324 if (reply) {
1325 in_reply_to = thread->transaction_stack;
1326 if (in_reply_to == NULL) {
1327 binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1328 proc->pid, thread->pid);
1329 return_error = BR_FAILED_REPLY;
1330 goto err_empty_call_stack;
1331 }
1332 binder_set_nice(in_reply_to->saved_priority);
1333 if (in_reply_to->to_thread != thread) {
1334 binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1335 proc->pid, thread->pid, in_reply_to->debug_id,
1336 in_reply_to->to_proc ?
1337 in_reply_to->to_proc->pid : 0,
1338 in_reply_to->to_thread ?
1339 in_reply_to->to_thread->pid : 0);
1340 return_error = BR_FAILED_REPLY;
1341 in_reply_to = NULL;
1342 goto err_bad_call_stack;
1343 }
1344 thread->transaction_stack = in_reply_to->to_parent;
1345 target_thread = in_reply_to->from;
1346 if (target_thread == NULL) {
1347 return_error = BR_DEAD_REPLY;
1348 goto err_dead_binder;
1349 }
1350 if (target_thread->transaction_stack != in_reply_to) {
1351 binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1352 proc->pid, thread->pid,
1353 target_thread->transaction_stack ?
1354 target_thread->transaction_stack->debug_id : 0,
1355 in_reply_to->debug_id);
1356 return_error = BR_FAILED_REPLY;
1357 in_reply_to = NULL;
1358 target_thread = NULL;
1359 goto err_dead_binder;
1360 }
1361 target_proc = target_thread->proc;
1362 } else {
1363 if (tr->target.handle) {
1364 struct binder_ref *ref;
1365 ref = binder_get_ref(proc, tr->target.handle);
1366 if (ref == NULL) {
1367 binder_user_error("%d:%d got transaction to invalid handle\n",
1368 proc->pid, thread->pid);
1369 return_error = BR_FAILED_REPLY;
1370 goto err_invalid_target_handle;
1371 }
1372 target_node = ref->node;
1373 } else {
1374 target_node = binder_context_mgr_node;
1375 if (target_node == NULL) {
1376 return_error = BR_DEAD_REPLY;
1377 goto err_no_context_mgr_node;
1378 }
1379 }
1380 e->to_node = target_node->debug_id;
1381 target_proc = target_node->proc;
1382 if (target_proc == NULL) {
1383 return_error = BR_DEAD_REPLY;
1384 goto err_dead_binder;
1385 }
1386 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1387 struct binder_transaction *tmp;
1388 tmp = thread->transaction_stack;
1389 if (tmp->to_thread != thread) {
1390 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1391 proc->pid, thread->pid, tmp->debug_id,
1392 tmp->to_proc ? tmp->to_proc->pid : 0,
1393 tmp->to_thread ?
1394 tmp->to_thread->pid : 0);
1395 return_error = BR_FAILED_REPLY;
1396 goto err_bad_call_stack;
1397 }
1398 while (tmp) {
1399 if (tmp->from && tmp->from->proc == target_proc)
1400 target_thread = tmp->from;
1401 tmp = tmp->from_parent;
1402 }
1403 }
1404 }
1405 if (target_thread) {
1406 e->to_thread = target_thread->pid;
1407 target_list = &target_thread->todo;
1408 target_wait = &target_thread->wait;
1409 } else {
1410 target_list = &target_proc->todo;
1411 target_wait = &target_proc->wait;
1412 }
1413 e->to_proc = target_proc->pid;
1414
1415 /* TODO: reuse incoming transaction for reply */
1416 t = kzalloc(sizeof(*t), GFP_KERNEL);
1417 if (t == NULL) {
1418 return_error = BR_FAILED_REPLY;
1419 goto err_alloc_t_failed;
1420 }
1421 binder_stats_created(BINDER_STAT_TRANSACTION);
1422
1423 tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1424 if (tcomplete == NULL) {
1425 return_error = BR_FAILED_REPLY;
1426 goto err_alloc_tcomplete_failed;
1427 }
1428 binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1429
1430 t->debug_id = ++binder_last_id;
1431 e->debug_id = t->debug_id;
1432
1433 if (reply)
1434 binder_debug(BINDER_DEBUG_TRANSACTION,
1435 "%d:%d BC_REPLY %d -> %d:%d, data %p-%p size %zd-%zd\n",
1436 proc->pid, thread->pid, t->debug_id,
1437 target_proc->pid, target_thread->pid,
1438 tr->data.ptr.buffer, tr->data.ptr.offsets,
1439 tr->data_size, tr->offsets_size);
1440 else
1441 binder_debug(BINDER_DEBUG_TRANSACTION,
1442 "%d:%d BC_TRANSACTION %d -> %d - node %d, data %p-%p size %zd-%zd\n",
1443 proc->pid, thread->pid, t->debug_id,
1444 target_proc->pid, target_node->debug_id,
1445 tr->data.ptr.buffer, tr->data.ptr.offsets,
1446 tr->data_size, tr->offsets_size);
1447
1448 if (!reply && !(tr->flags & TF_ONE_WAY))
1449 t->from = thread;
1450 else
1451 t->from = NULL;
1452 t->sender_euid = proc->tsk->cred->euid;
1453 t->to_proc = target_proc;
1454 t->to_thread = target_thread;
1455 t->code = tr->code;
1456 t->flags = tr->flags;
1457 t->priority = task_nice(current);
1458
1459 trace_binder_transaction(reply, t, target_node);
1460
1461 t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1462 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1463 if (t->buffer == NULL) {
1464 return_error = BR_FAILED_REPLY;
1465 goto err_binder_alloc_buf_failed;
1466 }
1467 t->buffer->allow_user_free = 0;
1468 t->buffer->debug_id = t->debug_id;
1469 t->buffer->transaction = t;
1470 t->buffer->target_node = target_node;
1471 trace_binder_transaction_alloc_buf(t->buffer);
1472 if (target_node)
1473 binder_inc_node(target_node, 1, 0, NULL);
1474
1475 offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1476
1477 if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1478 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1479 proc->pid, thread->pid);
1480 return_error = BR_FAILED_REPLY;
1481 goto err_copy_data_failed;
1482 }
1483 if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1484 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1485 proc->pid, thread->pid);
1486 return_error = BR_FAILED_REPLY;
1487 goto err_copy_data_failed;
1488 }
1489 if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1490 binder_user_error("%d:%d got transaction with invalid offsets size, %zd\n",
1491 proc->pid, thread->pid, tr->offsets_size);
1492 return_error = BR_FAILED_REPLY;
1493 goto err_bad_offset;
1494 }
1495 off_end = (void *)offp + tr->offsets_size;
1496 for (; offp < off_end; offp++) {
1497 struct flat_binder_object *fp;
1498 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1499 t->buffer->data_size < sizeof(*fp) ||
1500 !IS_ALIGNED(*offp, sizeof(u32))) {
1501 binder_user_error("%d:%d got transaction with invalid offset, %zd\n",
1502 proc->pid, thread->pid, *offp);
1503 return_error = BR_FAILED_REPLY;
1504 goto err_bad_offset;
1505 }
1506 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1507 switch (fp->type) {
1508 case BINDER_TYPE_BINDER:
1509 case BINDER_TYPE_WEAK_BINDER: {
1510 struct binder_ref *ref;
1511 struct binder_node *node = binder_get_node(proc, fp->binder);
1512 if (node == NULL) {
1513 node = binder_new_node(proc, fp->binder, fp->cookie);
1514 if (node == NULL) {
1515 return_error = BR_FAILED_REPLY;
1516 goto err_binder_new_node_failed;
1517 }
1518 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1519 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1520 }
1521 if (fp->cookie != node->cookie) {
1522 binder_user_error("%d:%d sending u%p node %d, cookie mismatch %p != %p\n",
1523 proc->pid, thread->pid,
1524 fp->binder, node->debug_id,
1525 fp->cookie, node->cookie);
1526 goto err_binder_get_ref_for_node_failed;
1527 }
1528 ref = binder_get_ref_for_node(target_proc, node);
1529 if (ref == NULL) {
1530 return_error = BR_FAILED_REPLY;
1531 goto err_binder_get_ref_for_node_failed;
1532 }
1533 if (fp->type == BINDER_TYPE_BINDER)
1534 fp->type = BINDER_TYPE_HANDLE;
1535 else
1536 fp->type = BINDER_TYPE_WEAK_HANDLE;
1537 fp->handle = ref->desc;
1538 binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1539 &thread->todo);
1540
1541 trace_binder_transaction_node_to_ref(t, node, ref);
1542 binder_debug(BINDER_DEBUG_TRANSACTION,
1543 " node %d u%p -> ref %d desc %d\n",
1544 node->debug_id, node->ptr, ref->debug_id,
1545 ref->desc);
1546 } break;
1547 case BINDER_TYPE_HANDLE:
1548 case BINDER_TYPE_WEAK_HANDLE: {
1549 struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1550 if (ref == NULL) {
1551 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1552 proc->pid,
1553 thread->pid, fp->handle);
1554 return_error = BR_FAILED_REPLY;
1555 goto err_binder_get_ref_failed;
1556 }
1557 if (ref->node->proc == target_proc) {
1558 if (fp->type == BINDER_TYPE_HANDLE)
1559 fp->type = BINDER_TYPE_BINDER;
1560 else
1561 fp->type = BINDER_TYPE_WEAK_BINDER;
1562 fp->binder = ref->node->ptr;
1563 fp->cookie = ref->node->cookie;
1564 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1565 trace_binder_transaction_ref_to_node(t, ref);
1566 binder_debug(BINDER_DEBUG_TRANSACTION,
1567 " ref %d desc %d -> node %d u%p\n",
1568 ref->debug_id, ref->desc, ref->node->debug_id,
1569 ref->node->ptr);
1570 } else {
1571 struct binder_ref *new_ref;
1572 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1573 if (new_ref == NULL) {
1574 return_error = BR_FAILED_REPLY;
1575 goto err_binder_get_ref_for_node_failed;
1576 }
1577 fp->handle = new_ref->desc;
1578 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1579 trace_binder_transaction_ref_to_ref(t, ref,
1580 new_ref);
1581 binder_debug(BINDER_DEBUG_TRANSACTION,
1582 " ref %d desc %d -> ref %d desc %d (node %d)\n",
1583 ref->debug_id, ref->desc, new_ref->debug_id,
1584 new_ref->desc, ref->node->debug_id);
1585 }
1586 } break;
1587
1588 case BINDER_TYPE_FD: {
1589 int target_fd;
1590 struct file *file;
1591
1592 if (reply) {
1593 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1594 binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1595 proc->pid, thread->pid, fp->handle);
1596 return_error = BR_FAILED_REPLY;
1597 goto err_fd_not_allowed;
1598 }
1599 } else if (!target_node->accept_fds) {
1600 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1601 proc->pid, thread->pid, fp->handle);
1602 return_error = BR_FAILED_REPLY;
1603 goto err_fd_not_allowed;
1604 }
1605
1606 file = fget(fp->handle);
1607 if (file == NULL) {
1608 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1609 proc->pid, thread->pid, fp->handle);
1610 return_error = BR_FAILED_REPLY;
1611 goto err_fget_failed;
1612 }
1613 target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1614 if (target_fd < 0) {
1615 fput(file);
1616 return_error = BR_FAILED_REPLY;
1617 goto err_get_unused_fd_failed;
1618 }
1619 task_fd_install(target_proc, target_fd, file);
1620 trace_binder_transaction_fd(t, fp->handle, target_fd);
1621 binder_debug(BINDER_DEBUG_TRANSACTION,
1622 " fd %d -> %d\n", fp->handle, target_fd);
1623 /* TODO: fput? */
1624 fp->handle = target_fd;
1625 } break;
1626
1627 default:
1628 binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1629 proc->pid, thread->pid, fp->type);
1630 return_error = BR_FAILED_REPLY;
1631 goto err_bad_object_type;
1632 }
1633 }
1634 if (reply) {
1635 BUG_ON(t->buffer->async_transaction != 0);
1636 binder_pop_transaction(target_thread, in_reply_to);
1637 } else if (!(t->flags & TF_ONE_WAY)) {
1638 BUG_ON(t->buffer->async_transaction != 0);
1639 t->need_reply = 1;
1640 t->from_parent = thread->transaction_stack;
1641 thread->transaction_stack = t;
1642 } else {
1643 BUG_ON(target_node == NULL);
1644 BUG_ON(t->buffer->async_transaction != 1);
1645 if (target_node->has_async_transaction) {
1646 target_list = &target_node->async_todo;
1647 target_wait = NULL;
1648 } else
1649 target_node->has_async_transaction = 1;
1650 }
1651 t->work.type = BINDER_WORK_TRANSACTION;
1652 list_add_tail(&t->work.entry, target_list);
1653 tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1654 list_add_tail(&tcomplete->entry, &thread->todo);
1655 if (target_wait)
1656 wake_up_interruptible(target_wait);
1657 return;
1658
1659 err_get_unused_fd_failed:
1660 err_fget_failed:
1661 err_fd_not_allowed:
1662 err_binder_get_ref_for_node_failed:
1663 err_binder_get_ref_failed:
1664 err_binder_new_node_failed:
1665 err_bad_object_type:
1666 err_bad_offset:
1667 err_copy_data_failed:
1668 trace_binder_transaction_failed_buffer_release(t->buffer);
1669 binder_transaction_buffer_release(target_proc, t->buffer, offp);
1670 t->buffer->transaction = NULL;
1671 binder_free_buf(target_proc, t->buffer);
1672 err_binder_alloc_buf_failed:
1673 kfree(tcomplete);
1674 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1675 err_alloc_tcomplete_failed:
1676 kfree(t);
1677 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1678 err_alloc_t_failed:
1679 err_bad_call_stack:
1680 err_empty_call_stack:
1681 err_dead_binder:
1682 err_invalid_target_handle:
1683 err_no_context_mgr_node:
1684 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1685 "%d:%d transaction failed %d, size %zd-%zd\n",
1686 proc->pid, thread->pid, return_error,
1687 tr->data_size, tr->offsets_size);
1688
1689 {
1690 struct binder_transaction_log_entry *fe;
1691 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1692 *fe = *e;
1693 }
1694
1695 BUG_ON(thread->return_error != BR_OK);
1696 if (in_reply_to) {
1697 thread->return_error = BR_TRANSACTION_COMPLETE;
1698 binder_send_failed_reply(in_reply_to, return_error);
1699 } else
1700 thread->return_error = return_error;
1701 }
1702
1703 static int binder_thread_write(struct binder_proc *proc,
1704 struct binder_thread *thread,
1705 void __user *buffer, size_t size, size_t *consumed)
1706 {
1707 uint32_t cmd;
1708 void __user *ptr = buffer + *consumed;
1709 void __user *end = buffer + size;
1710
1711 while (ptr < end && thread->return_error == BR_OK) {
1712 if (get_user(cmd, (uint32_t __user *)ptr))
1713 return -EFAULT;
1714 ptr += sizeof(uint32_t);
1715 trace_binder_command(cmd);
1716 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1717 binder_stats.bc[_IOC_NR(cmd)]++;
1718 proc->stats.bc[_IOC_NR(cmd)]++;
1719 thread->stats.bc[_IOC_NR(cmd)]++;
1720 }
1721 switch (cmd) {
1722 case BC_INCREFS:
1723 case BC_ACQUIRE:
1724 case BC_RELEASE:
1725 case BC_DECREFS: {
1726 uint32_t target;
1727 struct binder_ref *ref;
1728 const char *debug_string;
1729
1730 if (get_user(target, (uint32_t __user *)ptr))
1731 return -EFAULT;
1732 ptr += sizeof(uint32_t);
1733 if (target == 0 && binder_context_mgr_node &&
1734 (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1735 ref = binder_get_ref_for_node(proc,
1736 binder_context_mgr_node);
1737 if (ref->desc != target) {
1738 binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1739 proc->pid, thread->pid,
1740 ref->desc);
1741 }
1742 } else
1743 ref = binder_get_ref(proc, target);
1744 if (ref == NULL) {
1745 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1746 proc->pid, thread->pid, target);
1747 break;
1748 }
1749 switch (cmd) {
1750 case BC_INCREFS:
1751 debug_string = "IncRefs";
1752 binder_inc_ref(ref, 0, NULL);
1753 break;
1754 case BC_ACQUIRE:
1755 debug_string = "Acquire";
1756 binder_inc_ref(ref, 1, NULL);
1757 break;
1758 case BC_RELEASE:
1759 debug_string = "Release";
1760 binder_dec_ref(ref, 1);
1761 break;
1762 case BC_DECREFS:
1763 default:
1764 debug_string = "DecRefs";
1765 binder_dec_ref(ref, 0);
1766 break;
1767 }
1768 binder_debug(BINDER_DEBUG_USER_REFS,
1769 "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1770 proc->pid, thread->pid, debug_string, ref->debug_id,
1771 ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1772 break;
1773 }
1774 case BC_INCREFS_DONE:
1775 case BC_ACQUIRE_DONE: {
1776 void __user *node_ptr;
1777 void __user *cookie;
1778 struct binder_node *node;
1779
1780 if (get_user(node_ptr, (void * __user *)ptr))
1781 return -EFAULT;
1782 ptr += sizeof(void *);
1783 if (get_user(cookie, (void * __user *)ptr))
1784 return -EFAULT;
1785 ptr += sizeof(void *);
1786 node = binder_get_node(proc, node_ptr);
1787 if (node == NULL) {
1788 binder_user_error("%d:%d %s u%p no match\n",
1789 proc->pid, thread->pid,
1790 cmd == BC_INCREFS_DONE ?
1791 "BC_INCREFS_DONE" :
1792 "BC_ACQUIRE_DONE",
1793 node_ptr);
1794 break;
1795 }
1796 if (cookie != node->cookie) {
1797 binder_user_error("%d:%d %s u%p node %d cookie mismatch %p != %p\n",
1798 proc->pid, thread->pid,
1799 cmd == BC_INCREFS_DONE ?
1800 "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1801 node_ptr, node->debug_id,
1802 cookie, node->cookie);
1803 break;
1804 }
1805 if (cmd == BC_ACQUIRE_DONE) {
1806 if (node->pending_strong_ref == 0) {
1807 binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1808 proc->pid, thread->pid,
1809 node->debug_id);
1810 break;
1811 }
1812 node->pending_strong_ref = 0;
1813 } else {
1814 if (node->pending_weak_ref == 0) {
1815 binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1816 proc->pid, thread->pid,
1817 node->debug_id);
1818 break;
1819 }
1820 node->pending_weak_ref = 0;
1821 }
1822 binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1823 binder_debug(BINDER_DEBUG_USER_REFS,
1824 "%d:%d %s node %d ls %d lw %d\n",
1825 proc->pid, thread->pid,
1826 cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1827 node->debug_id, node->local_strong_refs, node->local_weak_refs);
1828 break;
1829 }
1830 case BC_ATTEMPT_ACQUIRE:
1831 pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1832 return -EINVAL;
1833 case BC_ACQUIRE_RESULT:
1834 pr_err("BC_ACQUIRE_RESULT not supported\n");
1835 return -EINVAL;
1836
1837 case BC_FREE_BUFFER: {
1838 void __user *data_ptr;
1839 struct binder_buffer *buffer;
1840
1841 if (get_user(data_ptr, (void * __user *)ptr))
1842 return -EFAULT;
1843 ptr += sizeof(void *);
1844
1845 buffer = binder_buffer_lookup(proc, data_ptr);
1846 if (buffer == NULL) {
1847 binder_user_error("%d:%d BC_FREE_BUFFER u%p no match\n",
1848 proc->pid, thread->pid, data_ptr);
1849 break;
1850 }
1851 if (!buffer->allow_user_free) {
1852 binder_user_error("%d:%d BC_FREE_BUFFER u%p matched unreturned buffer\n",
1853 proc->pid, thread->pid, data_ptr);
1854 break;
1855 }
1856 binder_debug(BINDER_DEBUG_FREE_BUFFER,
1857 "%d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1858 proc->pid, thread->pid, data_ptr, buffer->debug_id,
1859 buffer->transaction ? "active" : "finished");
1860
1861 if (buffer->transaction) {
1862 buffer->transaction->buffer = NULL;
1863 buffer->transaction = NULL;
1864 }
1865 if (buffer->async_transaction && buffer->target_node) {
1866 BUG_ON(!buffer->target_node->has_async_transaction);
1867 if (list_empty(&buffer->target_node->async_todo))
1868 buffer->target_node->has_async_transaction = 0;
1869 else
1870 list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1871 }
1872 trace_binder_transaction_buffer_release(buffer);
1873 binder_transaction_buffer_release(proc, buffer, NULL);
1874 binder_free_buf(proc, buffer);
1875 break;
1876 }
1877
1878 case BC_TRANSACTION:
1879 case BC_REPLY: {
1880 struct binder_transaction_data tr;
1881
1882 if (copy_from_user(&tr, ptr, sizeof(tr)))
1883 return -EFAULT;
1884 ptr += sizeof(tr);
1885 binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1886 break;
1887 }
1888
1889 case BC_REGISTER_LOOPER:
1890 binder_debug(BINDER_DEBUG_THREADS,
1891 "%d:%d BC_REGISTER_LOOPER\n",
1892 proc->pid, thread->pid);
1893 if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1894 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1895 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1896 proc->pid, thread->pid);
1897 } else if (proc->requested_threads == 0) {
1898 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1899 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1900 proc->pid, thread->pid);
1901 } else {
1902 proc->requested_threads--;
1903 proc->requested_threads_started++;
1904 }
1905 thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1906 break;
1907 case BC_ENTER_LOOPER:
1908 binder_debug(BINDER_DEBUG_THREADS,
1909 "%d:%d BC_ENTER_LOOPER\n",
1910 proc->pid, thread->pid);
1911 if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1912 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1913 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1914 proc->pid, thread->pid);
1915 }
1916 thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1917 break;
1918 case BC_EXIT_LOOPER:
1919 binder_debug(BINDER_DEBUG_THREADS,
1920 "%d:%d BC_EXIT_LOOPER\n",
1921 proc->pid, thread->pid);
1922 thread->looper |= BINDER_LOOPER_STATE_EXITED;
1923 break;
1924
1925 case BC_REQUEST_DEATH_NOTIFICATION:
1926 case BC_CLEAR_DEATH_NOTIFICATION: {
1927 uint32_t target;
1928 void __user *cookie;
1929 struct binder_ref *ref;
1930 struct binder_ref_death *death;
1931
1932 if (get_user(target, (uint32_t __user *)ptr))
1933 return -EFAULT;
1934 ptr += sizeof(uint32_t);
1935 if (get_user(cookie, (void __user * __user *)ptr))
1936 return -EFAULT;
1937 ptr += sizeof(void *);
1938 ref = binder_get_ref(proc, target);
1939 if (ref == NULL) {
1940 binder_user_error("%d:%d %s invalid ref %d\n",
1941 proc->pid, thread->pid,
1942 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1943 "BC_REQUEST_DEATH_NOTIFICATION" :
1944 "BC_CLEAR_DEATH_NOTIFICATION",
1945 target);
1946 break;
1947 }
1948
1949 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1950 "%d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
1951 proc->pid, thread->pid,
1952 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1953 "BC_REQUEST_DEATH_NOTIFICATION" :
1954 "BC_CLEAR_DEATH_NOTIFICATION",
1955 cookie, ref->debug_id, ref->desc,
1956 ref->strong, ref->weak, ref->node->debug_id);
1957
1958 if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1959 if (ref->death) {
1960 binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
1961 proc->pid, thread->pid);
1962 break;
1963 }
1964 death = kzalloc(sizeof(*death), GFP_KERNEL);
1965 if (death == NULL) {
1966 thread->return_error = BR_ERROR;
1967 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1968 "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
1969 proc->pid, thread->pid);
1970 break;
1971 }
1972 binder_stats_created(BINDER_STAT_DEATH);
1973 INIT_LIST_HEAD(&death->work.entry);
1974 death->cookie = cookie;
1975 ref->death = death;
1976 if (ref->node->proc == NULL) {
1977 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
1978 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
1979 list_add_tail(&ref->death->work.entry, &thread->todo);
1980 } else {
1981 list_add_tail(&ref->death->work.entry, &proc->todo);
1982 wake_up_interruptible(&proc->wait);
1983 }
1984 }
1985 } else {
1986 if (ref->death == NULL) {
1987 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
1988 proc->pid, thread->pid);
1989 break;
1990 }
1991 death = ref->death;
1992 if (death->cookie != cookie) {
1993 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %p != %p\n",
1994 proc->pid, thread->pid,
1995 death->cookie, cookie);
1996 break;
1997 }
1998 ref->death = NULL;
1999 if (list_empty(&death->work.entry)) {
2000 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2001 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2002 list_add_tail(&death->work.entry, &thread->todo);
2003 } else {
2004 list_add_tail(&death->work.entry, &proc->todo);
2005 wake_up_interruptible(&proc->wait);
2006 }
2007 } else {
2008 BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2009 death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2010 }
2011 }
2012 } break;
2013 case BC_DEAD_BINDER_DONE: {
2014 struct binder_work *w;
2015 void __user *cookie;
2016 struct binder_ref_death *death = NULL;
2017 if (get_user(cookie, (void __user * __user *)ptr))
2018 return -EFAULT;
2019
2020 ptr += sizeof(void *);
2021 list_for_each_entry(w, &proc->delivered_death, entry) {
2022 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2023 if (tmp_death->cookie == cookie) {
2024 death = tmp_death;
2025 break;
2026 }
2027 }
2028 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2029 "%d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2030 proc->pid, thread->pid, cookie, death);
2031 if (death == NULL) {
2032 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %p not found\n",
2033 proc->pid, thread->pid, cookie);
2034 break;
2035 }
2036
2037 list_del_init(&death->work.entry);
2038 if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2039 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2040 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2041 list_add_tail(&death->work.entry, &thread->todo);
2042 } else {
2043 list_add_tail(&death->work.entry, &proc->todo);
2044 wake_up_interruptible(&proc->wait);
2045 }
2046 }
2047 } break;
2048
2049 default:
2050 pr_err("%d:%d unknown command %d\n",
2051 proc->pid, thread->pid, cmd);
2052 return -EINVAL;
2053 }
2054 *consumed = ptr - buffer;
2055 }
2056 return 0;
2057 }
2058
2059 static void binder_stat_br(struct binder_proc *proc,
2060 struct binder_thread *thread, uint32_t cmd)
2061 {
2062 trace_binder_return(cmd);
2063 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2064 binder_stats.br[_IOC_NR(cmd)]++;
2065 proc->stats.br[_IOC_NR(cmd)]++;
2066 thread->stats.br[_IOC_NR(cmd)]++;
2067 }
2068 }
2069
2070 static int binder_has_proc_work(struct binder_proc *proc,
2071 struct binder_thread *thread)
2072 {
2073 return !list_empty(&proc->todo) ||
2074 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2075 }
2076
2077 static int binder_has_thread_work(struct binder_thread *thread)
2078 {
2079 return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2080 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2081 }
2082
2083 static int binder_thread_read(struct binder_proc *proc,
2084 struct binder_thread *thread,
2085 void __user *buffer, size_t size,
2086 size_t *consumed, int non_block)
2087 {
2088 void __user *ptr = buffer + *consumed;
2089 void __user *end = buffer + size;
2090
2091 int ret = 0;
2092 int wait_for_proc_work;
2093
2094 if (*consumed == 0) {
2095 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2096 return -EFAULT;
2097 ptr += sizeof(uint32_t);
2098 }
2099
2100 retry:
2101 wait_for_proc_work = thread->transaction_stack == NULL &&
2102 list_empty(&thread->todo);
2103
2104 if (thread->return_error != BR_OK && ptr < end) {
2105 if (thread->return_error2 != BR_OK) {
2106 if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2107 return -EFAULT;
2108 ptr += sizeof(uint32_t);
2109 binder_stat_br(proc, thread, thread->return_error2);
2110 if (ptr == end)
2111 goto done;
2112 thread->return_error2 = BR_OK;
2113 }
2114 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2115 return -EFAULT;
2116 ptr += sizeof(uint32_t);
2117 binder_stat_br(proc, thread, thread->return_error);
2118 thread->return_error = BR_OK;
2119 goto done;
2120 }
2121
2122
2123 thread->looper |= BINDER_LOOPER_STATE_WAITING;
2124 if (wait_for_proc_work)
2125 proc->ready_threads++;
2126
2127 binder_unlock(__func__);
2128
2129 trace_binder_wait_for_work(wait_for_proc_work,
2130 !!thread->transaction_stack,
2131 !list_empty(&thread->todo));
2132 if (wait_for_proc_work) {
2133 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2134 BINDER_LOOPER_STATE_ENTERED))) {
2135 binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2136 proc->pid, thread->pid, thread->looper);
2137 wait_event_interruptible(binder_user_error_wait,
2138 binder_stop_on_user_error < 2);
2139 }
2140 binder_set_nice(proc->default_priority);
2141 if (non_block) {
2142 if (!binder_has_proc_work(proc, thread))
2143 ret = -EAGAIN;
2144 } else
2145 ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2146 } else {
2147 if (non_block) {
2148 if (!binder_has_thread_work(thread))
2149 ret = -EAGAIN;
2150 } else
2151 ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2152 }
2153
2154 binder_lock(__func__);
2155
2156 if (wait_for_proc_work)
2157 proc->ready_threads--;
2158 thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2159
2160 if (ret)
2161 return ret;
2162
2163 while (1) {
2164 uint32_t cmd;
2165 struct binder_transaction_data tr;
2166 struct binder_work *w;
2167 struct binder_transaction *t = NULL;
2168
2169 if (!list_empty(&thread->todo))
2170 w = list_first_entry(&thread->todo, struct binder_work, entry);
2171 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2172 w = list_first_entry(&proc->todo, struct binder_work, entry);
2173 else {
2174 if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2175 goto retry;
2176 break;
2177 }
2178
2179 if (end - ptr < sizeof(tr) + 4)
2180 break;
2181
2182 switch (w->type) {
2183 case BINDER_WORK_TRANSACTION: {
2184 t = container_of(w, struct binder_transaction, work);
2185 } break;
2186 case BINDER_WORK_TRANSACTION_COMPLETE: {
2187 cmd = BR_TRANSACTION_COMPLETE;
2188 if (put_user(cmd, (uint32_t __user *)ptr))
2189 return -EFAULT;
2190 ptr += sizeof(uint32_t);
2191
2192 binder_stat_br(proc, thread, cmd);
2193 binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2194 "%d:%d BR_TRANSACTION_COMPLETE\n",
2195 proc->pid, thread->pid);
2196
2197 list_del(&w->entry);
2198 kfree(w);
2199 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2200 } break;
2201 case BINDER_WORK_NODE: {
2202 struct binder_node *node = container_of(w, struct binder_node, work);
2203 uint32_t cmd = BR_NOOP;
2204 const char *cmd_name;
2205 int strong = node->internal_strong_refs || node->local_strong_refs;
2206 int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2207 if (weak && !node->has_weak_ref) {
2208 cmd = BR_INCREFS;
2209 cmd_name = "BR_INCREFS";
2210 node->has_weak_ref = 1;
2211 node->pending_weak_ref = 1;
2212 node->local_weak_refs++;
2213 } else if (strong && !node->has_strong_ref) {
2214 cmd = BR_ACQUIRE;
2215 cmd_name = "BR_ACQUIRE";
2216 node->has_strong_ref = 1;
2217 node->pending_strong_ref = 1;
2218 node->local_strong_refs++;
2219 } else if (!strong && node->has_strong_ref) {
2220 cmd = BR_RELEASE;
2221 cmd_name = "BR_RELEASE";
2222 node->has_strong_ref = 0;
2223 } else if (!weak && node->has_weak_ref) {
2224 cmd = BR_DECREFS;
2225 cmd_name = "BR_DECREFS";
2226 node->has_weak_ref = 0;
2227 }
2228 if (cmd != BR_NOOP) {
2229 if (put_user(cmd, (uint32_t __user *)ptr))
2230 return -EFAULT;
2231 ptr += sizeof(uint32_t);
2232 if (put_user(node->ptr, (void * __user *)ptr))
2233 return -EFAULT;
2234 ptr += sizeof(void *);
2235 if (put_user(node->cookie, (void * __user *)ptr))
2236 return -EFAULT;
2237 ptr += sizeof(void *);
2238
2239 binder_stat_br(proc, thread, cmd);
2240 binder_debug(BINDER_DEBUG_USER_REFS,
2241 "%d:%d %s %d u%p c%p\n",
2242 proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2243 } else {
2244 list_del_init(&w->entry);
2245 if (!weak && !strong) {
2246 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2247 "%d:%d node %d u%p c%p deleted\n",
2248 proc->pid, thread->pid, node->debug_id,
2249 node->ptr, node->cookie);
2250 rb_erase(&node->rb_node, &proc->nodes);
2251 kfree(node);
2252 binder_stats_deleted(BINDER_STAT_NODE);
2253 } else {
2254 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2255 "%d:%d node %d u%p c%p state unchanged\n",
2256 proc->pid, thread->pid, node->debug_id, node->ptr,
2257 node->cookie);
2258 }
2259 }
2260 } break;
2261 case BINDER_WORK_DEAD_BINDER:
2262 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2263 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2264 struct binder_ref_death *death;
2265 uint32_t cmd;
2266
2267 death = container_of(w, struct binder_ref_death, work);
2268 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2269 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2270 else
2271 cmd = BR_DEAD_BINDER;
2272 if (put_user(cmd, (uint32_t __user *)ptr))
2273 return -EFAULT;
2274 ptr += sizeof(uint32_t);
2275 if (put_user(death->cookie, (void * __user *)ptr))
2276 return -EFAULT;
2277 ptr += sizeof(void *);
2278 binder_stat_br(proc, thread, cmd);
2279 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2280 "%d:%d %s %p\n",
2281 proc->pid, thread->pid,
2282 cmd == BR_DEAD_BINDER ?
2283 "BR_DEAD_BINDER" :
2284 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2285 death->cookie);
2286
2287 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2288 list_del(&w->entry);
2289 kfree(death);
2290 binder_stats_deleted(BINDER_STAT_DEATH);
2291 } else
2292 list_move(&w->entry, &proc->delivered_death);
2293 if (cmd == BR_DEAD_BINDER)
2294 goto done; /* DEAD_BINDER notifications can cause transactions */
2295 } break;
2296 }
2297
2298 if (!t)
2299 continue;
2300
2301 BUG_ON(t->buffer == NULL);
2302 if (t->buffer->target_node) {
2303 struct binder_node *target_node = t->buffer->target_node;
2304 tr.target.ptr = target_node->ptr;
2305 tr.cookie = target_node->cookie;
2306 t->saved_priority = task_nice(current);
2307 if (t->priority < target_node->min_priority &&
2308 !(t->flags & TF_ONE_WAY))
2309 binder_set_nice(t->priority);
2310 else if (!(t->flags & TF_ONE_WAY) ||
2311 t->saved_priority > target_node->min_priority)
2312 binder_set_nice(target_node->min_priority);
2313 cmd = BR_TRANSACTION;
2314 } else {
2315 tr.target.ptr = NULL;
2316 tr.cookie = NULL;
2317 cmd = BR_REPLY;
2318 }
2319 tr.code = t->code;
2320 tr.flags = t->flags;
2321 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2322
2323 if (t->from) {
2324 struct task_struct *sender = t->from->proc->tsk;
2325 tr.sender_pid = task_tgid_nr_ns(sender,
2326 task_active_pid_ns(current));
2327 } else {
2328 tr.sender_pid = 0;
2329 }
2330
2331 tr.data_size = t->buffer->data_size;
2332 tr.offsets_size = t->buffer->offsets_size;
2333 tr.data.ptr.buffer = (void *)t->buffer->data +
2334 proc->user_buffer_offset;
2335 tr.data.ptr.offsets = tr.data.ptr.buffer +
2336 ALIGN(t->buffer->data_size,
2337 sizeof(void *));
2338
2339 if (put_user(cmd, (uint32_t __user *)ptr))
2340 return -EFAULT;
2341 ptr += sizeof(uint32_t);
2342 if (copy_to_user(ptr, &tr, sizeof(tr)))
2343 return -EFAULT;
2344 ptr += sizeof(tr);
2345
2346 trace_binder_transaction_received(t);
2347 binder_stat_br(proc, thread, cmd);
2348 binder_debug(BINDER_DEBUG_TRANSACTION,
2349 "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %p-%p\n",
2350 proc->pid, thread->pid,
2351 (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2352 "BR_REPLY",
2353 t->debug_id, t->from ? t->from->proc->pid : 0,
2354 t->from ? t->from->pid : 0, cmd,
2355 t->buffer->data_size, t->buffer->offsets_size,
2356 tr.data.ptr.buffer, tr.data.ptr.offsets);
2357
2358 list_del(&t->work.entry);
2359 t->buffer->allow_user_free = 1;
2360 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2361 t->to_parent = thread->transaction_stack;
2362 t->to_thread = thread;
2363 thread->transaction_stack = t;
2364 } else {
2365 t->buffer->transaction = NULL;
2366 kfree(t);
2367 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2368 }
2369 break;
2370 }
2371
2372 done:
2373
2374 *consumed = ptr - buffer;
2375 if (proc->requested_threads + proc->ready_threads == 0 &&
2376 proc->requested_threads_started < proc->max_threads &&
2377 (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2378 BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2379 /*spawn a new thread if we leave this out */) {
2380 proc->requested_threads++;
2381 binder_debug(BINDER_DEBUG_THREADS,
2382 "%d:%d BR_SPAWN_LOOPER\n",
2383 proc->pid, thread->pid);
2384 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2385 return -EFAULT;
2386 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2387 }
2388 return 0;
2389 }
2390
2391 static void binder_release_work(struct list_head *list)
2392 {
2393 struct binder_work *w;
2394 while (!list_empty(list)) {
2395 w = list_first_entry(list, struct binder_work, entry);
2396 list_del_init(&w->entry);
2397 switch (w->type) {
2398 case BINDER_WORK_TRANSACTION: {
2399 struct binder_transaction *t;
2400
2401 t = container_of(w, struct binder_transaction, work);
2402 if (t->buffer->target_node &&
2403 !(t->flags & TF_ONE_WAY)) {
2404 binder_send_failed_reply(t, BR_DEAD_REPLY);
2405 } else {
2406 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2407 "undelivered transaction %d\n",
2408 t->debug_id);
2409 t->buffer->transaction = NULL;
2410 kfree(t);
2411 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2412 }
2413 } break;
2414 case BINDER_WORK_TRANSACTION_COMPLETE: {
2415 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2416 "undelivered TRANSACTION_COMPLETE\n");
2417 kfree(w);
2418 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2419 } break;
2420 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2421 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2422 struct binder_ref_death *death;
2423
2424 death = container_of(w, struct binder_ref_death, work);
2425 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2426 "undelivered death notification, %p\n",
2427 death->cookie);
2428 kfree(death);
2429 binder_stats_deleted(BINDER_STAT_DEATH);
2430 } break;
2431 default:
2432 pr_err("unexpected work type, %d, not freed\n",
2433 w->type);
2434 break;
2435 }
2436 }
2437
2438 }
2439
2440 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2441 {
2442 struct binder_thread *thread = NULL;
2443 struct rb_node *parent = NULL;
2444 struct rb_node **p = &proc->threads.rb_node;
2445
2446 while (*p) {
2447 parent = *p;
2448 thread = rb_entry(parent, struct binder_thread, rb_node);
2449
2450 if (current->pid < thread->pid)
2451 p = &(*p)->rb_left;
2452 else if (current->pid > thread->pid)
2453 p = &(*p)->rb_right;
2454 else
2455 break;
2456 }
2457 if (*p == NULL) {
2458 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2459 if (thread == NULL)
2460 return NULL;
2461 binder_stats_created(BINDER_STAT_THREAD);
2462 thread->proc = proc;
2463 thread->pid = current->pid;
2464 init_waitqueue_head(&thread->wait);
2465 INIT_LIST_HEAD(&thread->todo);
2466 rb_link_node(&thread->rb_node, parent, p);
2467 rb_insert_color(&thread->rb_node, &proc->threads);
2468 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2469 thread->return_error = BR_OK;
2470 thread->return_error2 = BR_OK;
2471 }
2472 return thread;
2473 }
2474
2475 static int binder_free_thread(struct binder_proc *proc,
2476 struct binder_thread *thread)
2477 {
2478 struct binder_transaction *t;
2479 struct binder_transaction *send_reply = NULL;
2480 int active_transactions = 0;
2481
2482 rb_erase(&thread->rb_node, &proc->threads);
2483 t = thread->transaction_stack;
2484 if (t && t->to_thread == thread)
2485 send_reply = t;
2486 while (t) {
2487 active_transactions++;
2488 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2489 "release %d:%d transaction %d %s, still active\n",
2490 proc->pid, thread->pid,
2491 t->debug_id,
2492 (t->to_thread == thread) ? "in" : "out");
2493
2494 if (t->to_thread == thread) {
2495 t->to_proc = NULL;
2496 t->to_thread = NULL;
2497 if (t->buffer) {
2498 t->buffer->transaction = NULL;
2499 t->buffer = NULL;
2500 }
2501 t = t->to_parent;
2502 } else if (t->from == thread) {
2503 t->from = NULL;
2504 t = t->from_parent;
2505 } else
2506 BUG();
2507 }
2508 if (send_reply)
2509 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2510 binder_release_work(&thread->todo);
2511 kfree(thread);
2512 binder_stats_deleted(BINDER_STAT_THREAD);
2513 return active_transactions;
2514 }
2515
2516 static unsigned int binder_poll(struct file *filp,
2517 struct poll_table_struct *wait)
2518 {
2519 struct binder_proc *proc = filp->private_data;
2520 struct binder_thread *thread = NULL;
2521 int wait_for_proc_work;
2522
2523 binder_lock(__func__);
2524
2525 thread = binder_get_thread(proc);
2526
2527 wait_for_proc_work = thread->transaction_stack == NULL &&
2528 list_empty(&thread->todo) && thread->return_error == BR_OK;
2529
2530 binder_unlock(__func__);
2531
2532 if (wait_for_proc_work) {
2533 if (binder_has_proc_work(proc, thread))
2534 return POLLIN;
2535 poll_wait(filp, &proc->wait, wait);
2536 if (binder_has_proc_work(proc, thread))
2537 return POLLIN;
2538 } else {
2539 if (binder_has_thread_work(thread))
2540 return POLLIN;
2541 poll_wait(filp, &thread->wait, wait);
2542 if (binder_has_thread_work(thread))
2543 return POLLIN;
2544 }
2545 return 0;
2546 }
2547
2548 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2549 {
2550 int ret;
2551 struct binder_proc *proc = filp->private_data;
2552 struct binder_thread *thread;
2553 unsigned int size = _IOC_SIZE(cmd);
2554 void __user *ubuf = (void __user *)arg;
2555
2556 /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2557
2558 trace_binder_ioctl(cmd, arg);
2559
2560 ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2561 if (ret)
2562 goto err_unlocked;
2563
2564 binder_lock(__func__);
2565 thread = binder_get_thread(proc);
2566 if (thread == NULL) {
2567 ret = -ENOMEM;
2568 goto err;
2569 }
2570
2571 switch (cmd) {
2572 case BINDER_WRITE_READ: {
2573 struct binder_write_read bwr;
2574 if (size != sizeof(struct binder_write_read)) {
2575 ret = -EINVAL;
2576 goto err;
2577 }
2578 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2579 ret = -EFAULT;
2580 goto err;
2581 }
2582 binder_debug(BINDER_DEBUG_READ_WRITE,
2583 "%d:%d write %zd at %016lx, read %zd at %016lx\n",
2584 proc->pid, thread->pid, bwr.write_size,
2585 bwr.write_buffer, bwr.read_size, bwr.read_buffer);
2586
2587 if (bwr.write_size > 0) {
2588 ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2589 trace_binder_write_done(ret);
2590 if (ret < 0) {
2591 bwr.read_consumed = 0;
2592 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2593 ret = -EFAULT;
2594 goto err;
2595 }
2596 }
2597 if (bwr.read_size > 0) {
2598 ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2599 trace_binder_read_done(ret);
2600 if (!list_empty(&proc->todo))
2601 wake_up_interruptible(&proc->wait);
2602 if (ret < 0) {
2603 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2604 ret = -EFAULT;
2605 goto err;
2606 }
2607 }
2608 binder_debug(BINDER_DEBUG_READ_WRITE,
2609 "%d:%d wrote %zd of %zd, read return %zd of %zd\n",
2610 proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2611 bwr.read_consumed, bwr.read_size);
2612 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2613 ret = -EFAULT;
2614 goto err;
2615 }
2616 break;
2617 }
2618 case BINDER_SET_MAX_THREADS:
2619 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2620 ret = -EINVAL;
2621 goto err;
2622 }
2623 break;
2624 case BINDER_SET_CONTEXT_MGR:
2625 if (binder_context_mgr_node != NULL) {
2626 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2627 ret = -EBUSY;
2628 goto err;
2629 }
2630 if (uid_valid(binder_context_mgr_uid)) {
2631 if (!uid_eq(binder_context_mgr_uid, current->cred->euid)) {
2632 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2633 from_kuid(&init_user_ns, current->cred->euid),
2634 from_kuid(&init_user_ns, binder_context_mgr_uid));
2635 ret = -EPERM;
2636 goto err;
2637 }
2638 } else
2639 binder_context_mgr_uid = current->cred->euid;
2640 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2641 if (binder_context_mgr_node == NULL) {
2642 ret = -ENOMEM;
2643 goto err;
2644 }
2645 binder_context_mgr_node->local_weak_refs++;
2646 binder_context_mgr_node->local_strong_refs++;
2647 binder_context_mgr_node->has_strong_ref = 1;
2648 binder_context_mgr_node->has_weak_ref = 1;
2649 break;
2650 case BINDER_THREAD_EXIT:
2651 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2652 proc->pid, thread->pid);
2653 binder_free_thread(proc, thread);
2654 thread = NULL;
2655 break;
2656 case BINDER_VERSION:
2657 if (size != sizeof(struct binder_version)) {
2658 ret = -EINVAL;
2659 goto err;
2660 }
2661 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2662 ret = -EINVAL;
2663 goto err;
2664 }
2665 break;
2666 default:
2667 ret = -EINVAL;
2668 goto err;
2669 }
2670 ret = 0;
2671 err:
2672 if (thread)
2673 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2674 binder_unlock(__func__);
2675 wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2676 if (ret && ret != -ERESTARTSYS)
2677 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2678 err_unlocked:
2679 trace_binder_ioctl_done(ret);
2680 return ret;
2681 }
2682
2683 static void binder_vma_open(struct vm_area_struct *vma)
2684 {
2685 struct binder_proc *proc = vma->vm_private_data;
2686 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2687 "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2688 proc->pid, vma->vm_start, vma->vm_end,
2689 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2690 (unsigned long)pgprot_val(vma->vm_page_prot));
2691 }
2692
2693 static void binder_vma_close(struct vm_area_struct *vma)
2694 {
2695 struct binder_proc *proc = vma->vm_private_data;
2696 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2697 "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2698 proc->pid, vma->vm_start, vma->vm_end,
2699 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2700 (unsigned long)pgprot_val(vma->vm_page_prot));
2701 proc->vma = NULL;
2702 proc->vma_vm_mm = NULL;
2703 binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2704 }
2705
2706 static struct vm_operations_struct binder_vm_ops = {
2707 .open = binder_vma_open,
2708 .close = binder_vma_close,
2709 };
2710
2711 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2712 {
2713 int ret;
2714 struct vm_struct *area;
2715 struct binder_proc *proc = filp->private_data;
2716 const char *failure_string;
2717 struct binder_buffer *buffer;
2718
2719 if (proc->tsk != current)
2720 return -EINVAL;
2721
2722 if ((vma->vm_end - vma->vm_start) > SZ_4M)
2723 vma->vm_end = vma->vm_start + SZ_4M;
2724
2725 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2726 "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2727 proc->pid, vma->vm_start, vma->vm_end,
2728 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2729 (unsigned long)pgprot_val(vma->vm_page_prot));
2730
2731 if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2732 ret = -EPERM;
2733 failure_string = "bad vm_flags";
2734 goto err_bad_arg;
2735 }
2736 vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2737
2738 mutex_lock(&binder_mmap_lock);
2739 if (proc->buffer) {
2740 ret = -EBUSY;
2741 failure_string = "already mapped";
2742 goto err_already_mapped;
2743 }
2744
2745 area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2746 if (area == NULL) {
2747 ret = -ENOMEM;
2748 failure_string = "get_vm_area";
2749 goto err_get_vm_area_failed;
2750 }
2751 proc->buffer = area->addr;
2752 proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2753 mutex_unlock(&binder_mmap_lock);
2754
2755 #ifdef CONFIG_CPU_CACHE_VIPT
2756 if (cache_is_vipt_aliasing()) {
2757 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2758 pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2759 vma->vm_start += PAGE_SIZE;
2760 }
2761 }
2762 #endif
2763 proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2764 if (proc->pages == NULL) {
2765 ret = -ENOMEM;
2766 failure_string = "alloc page array";
2767 goto err_alloc_pages_failed;
2768 }
2769 proc->buffer_size = vma->vm_end - vma->vm_start;
2770
2771 vma->vm_ops = &binder_vm_ops;
2772 vma->vm_private_data = proc;
2773
2774 if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2775 ret = -ENOMEM;
2776 failure_string = "alloc small buf";
2777 goto err_alloc_small_buf_failed;
2778 }
2779 buffer = proc->buffer;
2780 INIT_LIST_HEAD(&proc->buffers);
2781 list_add(&buffer->entry, &proc->buffers);
2782 buffer->free = 1;
2783 binder_insert_free_buffer(proc, buffer);
2784 proc->free_async_space = proc->buffer_size / 2;
2785 barrier();
2786 proc->files = get_files_struct(current);
2787 proc->vma = vma;
2788 proc->vma_vm_mm = vma->vm_mm;
2789
2790 /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2791 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2792 return 0;
2793
2794 err_alloc_small_buf_failed:
2795 kfree(proc->pages);
2796 proc->pages = NULL;
2797 err_alloc_pages_failed:
2798 mutex_lock(&binder_mmap_lock);
2799 vfree(proc->buffer);
2800 proc->buffer = NULL;
2801 err_get_vm_area_failed:
2802 err_already_mapped:
2803 mutex_unlock(&binder_mmap_lock);
2804 err_bad_arg:
2805 pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2806 proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2807 return ret;
2808 }
2809
2810 static int binder_open(struct inode *nodp, struct file *filp)
2811 {
2812 struct binder_proc *proc;
2813
2814 binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2815 current->group_leader->pid, current->pid);
2816
2817 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2818 if (proc == NULL)
2819 return -ENOMEM;
2820 get_task_struct(current);
2821 proc->tsk = current;
2822 INIT_LIST_HEAD(&proc->todo);
2823 init_waitqueue_head(&proc->wait);
2824 proc->default_priority = task_nice(current);
2825
2826 binder_lock(__func__);
2827
2828 binder_stats_created(BINDER_STAT_PROC);
2829 hlist_add_head(&proc->proc_node, &binder_procs);
2830 proc->pid = current->group_leader->pid;
2831 INIT_LIST_HEAD(&proc->delivered_death);
2832 filp->private_data = proc;
2833
2834 binder_unlock(__func__);
2835
2836 if (binder_debugfs_dir_entry_proc) {
2837 char strbuf[11];
2838 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2839 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2840 binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2841 }
2842
2843 return 0;
2844 }
2845
2846 static int binder_flush(struct file *filp, fl_owner_t id)
2847 {
2848 struct binder_proc *proc = filp->private_data;
2849
2850 binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2851
2852 return 0;
2853 }
2854
2855 static void binder_deferred_flush(struct binder_proc *proc)
2856 {
2857 struct rb_node *n;
2858 int wake_count = 0;
2859 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2860 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2861 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2862 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2863 wake_up_interruptible(&thread->wait);
2864 wake_count++;
2865 }
2866 }
2867 wake_up_interruptible_all(&proc->wait);
2868
2869 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2870 "binder_flush: %d woke %d threads\n", proc->pid,
2871 wake_count);
2872 }
2873
2874 static int binder_release(struct inode *nodp, struct file *filp)
2875 {
2876 struct binder_proc *proc = filp->private_data;
2877 debugfs_remove(proc->debugfs_entry);
2878 binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2879
2880 return 0;
2881 }
2882
2883 static int binder_node_release(struct binder_node *node, int refs)
2884 {
2885 struct binder_ref *ref;
2886 int death = 0;
2887
2888 list_del_init(&node->work.entry);
2889 binder_release_work(&node->async_todo);
2890
2891 if (hlist_empty(&node->refs)) {
2892 kfree(node);
2893 binder_stats_deleted(BINDER_STAT_NODE);
2894
2895 return refs;
2896 }
2897
2898 node->proc = NULL;
2899 node->local_strong_refs = 0;
2900 node->local_weak_refs = 0;
2901 hlist_add_head(&node->dead_node, &binder_dead_nodes);
2902
2903 hlist_for_each_entry(ref, &node->refs, node_entry) {
2904 refs++;
2905
2906 if (!ref->death)
2907 goto out;
2908
2909 death++;
2910
2911 if (list_empty(&ref->death->work.entry)) {
2912 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2913 list_add_tail(&ref->death->work.entry,
2914 &ref->proc->todo);
2915 wake_up_interruptible(&ref->proc->wait);
2916 } else
2917 BUG();
2918 }
2919
2920 out:
2921 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2922 "node %d now dead, refs %d, death %d\n",
2923 node->debug_id, refs, death);
2924
2925 return refs;
2926 }
2927
2928 static void binder_deferred_release(struct binder_proc *proc)
2929 {
2930 struct binder_transaction *t;
2931 struct rb_node *n;
2932 int threads, nodes, incoming_refs, outgoing_refs, buffers,
2933 active_transactions, page_count;
2934
2935 BUG_ON(proc->vma);
2936 BUG_ON(proc->files);
2937
2938 hlist_del(&proc->proc_node);
2939
2940 if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2941 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2942 "%s: %d context_mgr_node gone\n",
2943 __func__, proc->pid);
2944 binder_context_mgr_node = NULL;
2945 }
2946
2947 threads = 0;
2948 active_transactions = 0;
2949 while ((n = rb_first(&proc->threads))) {
2950 struct binder_thread *thread;
2951
2952 thread = rb_entry(n, struct binder_thread, rb_node);
2953 threads++;
2954 active_transactions += binder_free_thread(proc, thread);
2955 }
2956
2957 nodes = 0;
2958 incoming_refs = 0;
2959 while ((n = rb_first(&proc->nodes))) {
2960 struct binder_node *node;
2961
2962 node = rb_entry(n, struct binder_node, rb_node);
2963 nodes++;
2964 rb_erase(&node->rb_node, &proc->nodes);
2965 incoming_refs = binder_node_release(node, incoming_refs);
2966 }
2967
2968 outgoing_refs = 0;
2969 while ((n = rb_first(&proc->refs_by_desc))) {
2970 struct binder_ref *ref;
2971
2972 ref = rb_entry(n, struct binder_ref, rb_node_desc);
2973 outgoing_refs++;
2974 binder_delete_ref(ref);
2975 }
2976
2977 binder_release_work(&proc->todo);
2978 binder_release_work(&proc->delivered_death);
2979
2980 buffers = 0;
2981 while ((n = rb_first(&proc->allocated_buffers))) {
2982 struct binder_buffer *buffer;
2983
2984 buffer = rb_entry(n, struct binder_buffer, rb_node);
2985
2986 t = buffer->transaction;
2987 if (t) {
2988 t->buffer = NULL;
2989 buffer->transaction = NULL;
2990 pr_err("release proc %d, transaction %d, not freed\n",
2991 proc->pid, t->debug_id);
2992 /*BUG();*/
2993 }
2994
2995 binder_free_buf(proc, buffer);
2996 buffers++;
2997 }
2998
2999 binder_stats_deleted(BINDER_STAT_PROC);
3000
3001 page_count = 0;
3002 if (proc->pages) {
3003 int i;
3004
3005 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3006 void *page_addr;
3007
3008 if (!proc->pages[i])
3009 continue;
3010
3011 page_addr = proc->buffer + i * PAGE_SIZE;
3012 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3013 "%s: %d: page %d at %p not freed\n",
3014 __func__, proc->pid, i, page_addr);
3015 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3016 __free_page(proc->pages[i]);
3017 page_count++;
3018 }
3019 kfree(proc->pages);
3020 vfree(proc->buffer);
3021 }
3022
3023 put_task_struct(proc->tsk);
3024
3025 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3026 "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3027 __func__, proc->pid, threads, nodes, incoming_refs,
3028 outgoing_refs, active_transactions, buffers, page_count);
3029
3030 kfree(proc);
3031 }
3032
3033 static void binder_deferred_func(struct work_struct *work)
3034 {
3035 struct binder_proc *proc;
3036 struct files_struct *files;
3037
3038 int defer;
3039 do {
3040 binder_lock(__func__);
3041 mutex_lock(&binder_deferred_lock);
3042 if (!hlist_empty(&binder_deferred_list)) {
3043 proc = hlist_entry(binder_deferred_list.first,
3044 struct binder_proc, deferred_work_node);
3045 hlist_del_init(&proc->deferred_work_node);
3046 defer = proc->deferred_work;
3047 proc->deferred_work = 0;
3048 } else {
3049 proc = NULL;
3050 defer = 0;
3051 }
3052 mutex_unlock(&binder_deferred_lock);
3053
3054 files = NULL;
3055 if (defer & BINDER_DEFERRED_PUT_FILES) {
3056 files = proc->files;
3057 if (files)
3058 proc->files = NULL;
3059 }
3060
3061 if (defer & BINDER_DEFERRED_FLUSH)
3062 binder_deferred_flush(proc);
3063
3064 if (defer & BINDER_DEFERRED_RELEASE)
3065 binder_deferred_release(proc); /* frees proc */
3066
3067 binder_unlock(__func__);
3068 if (files)
3069 put_files_struct(files);
3070 } while (proc);
3071 }
3072 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3073
3074 static void
3075 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3076 {
3077 mutex_lock(&binder_deferred_lock);
3078 proc->deferred_work |= defer;
3079 if (hlist_unhashed(&proc->deferred_work_node)) {
3080 hlist_add_head(&proc->deferred_work_node,
3081 &binder_deferred_list);
3082 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3083 }
3084 mutex_unlock(&binder_deferred_lock);
3085 }
3086
3087 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3088 struct binder_transaction *t)
3089 {
3090 seq_printf(m,
3091 "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3092 prefix, t->debug_id, t,
3093 t->from ? t->from->proc->pid : 0,
3094 t->from ? t->from->pid : 0,
3095 t->to_proc ? t->to_proc->pid : 0,
3096 t->to_thread ? t->to_thread->pid : 0,
3097 t->code, t->flags, t->priority, t->need_reply);
3098 if (t->buffer == NULL) {
3099 seq_puts(m, " buffer free\n");
3100 return;
3101 }
3102 if (t->buffer->target_node)
3103 seq_printf(m, " node %d",
3104 t->buffer->target_node->debug_id);
3105 seq_printf(m, " size %zd:%zd data %p\n",
3106 t->buffer->data_size, t->buffer->offsets_size,
3107 t->buffer->data);
3108 }
3109
3110 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3111 struct binder_buffer *buffer)
3112 {
3113 seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3114 prefix, buffer->debug_id, buffer->data,
3115 buffer->data_size, buffer->offsets_size,
3116 buffer->transaction ? "active" : "delivered");
3117 }
3118
3119 static void print_binder_work(struct seq_file *m, const char *prefix,
3120 const char *transaction_prefix,
3121 struct binder_work *w)
3122 {
3123 struct binder_node *node;
3124 struct binder_transaction *t;
3125
3126 switch (w->type) {
3127 case BINDER_WORK_TRANSACTION:
3128 t = container_of(w, struct binder_transaction, work);
3129 print_binder_transaction(m, transaction_prefix, t);
3130 break;
3131 case BINDER_WORK_TRANSACTION_COMPLETE:
3132 seq_printf(m, "%stransaction complete\n", prefix);
3133 break;
3134 case BINDER_WORK_NODE:
3135 node = container_of(w, struct binder_node, work);
3136 seq_printf(m, "%snode work %d: u%p c%p\n",
3137 prefix, node->debug_id, node->ptr, node->cookie);
3138 break;
3139 case BINDER_WORK_DEAD_BINDER:
3140 seq_printf(m, "%shas dead binder\n", prefix);
3141 break;
3142 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3143 seq_printf(m, "%shas cleared dead binder\n", prefix);
3144 break;
3145 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3146 seq_printf(m, "%shas cleared death notification\n", prefix);
3147 break;
3148 default:
3149 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3150 break;
3151 }
3152 }
3153
3154 static void print_binder_thread(struct seq_file *m,
3155 struct binder_thread *thread,
3156 int print_always)
3157 {
3158 struct binder_transaction *t;
3159 struct binder_work *w;
3160 size_t start_pos = m->count;
3161 size_t header_pos;
3162
3163 seq_printf(m, " thread %d: l %02x\n", thread->pid, thread->looper);
3164 header_pos = m->count;
3165 t = thread->transaction_stack;
3166 while (t) {
3167 if (t->from == thread) {
3168 print_binder_transaction(m,
3169 " outgoing transaction", t);
3170 t = t->from_parent;
3171 } else if (t->to_thread == thread) {
3172 print_binder_transaction(m,
3173 " incoming transaction", t);
3174 t = t->to_parent;
3175 } else {
3176 print_binder_transaction(m, " bad transaction", t);
3177 t = NULL;
3178 }
3179 }
3180 list_for_each_entry(w, &thread->todo, entry) {
3181 print_binder_work(m, " ", " pending transaction", w);
3182 }
3183 if (!print_always && m->count == header_pos)
3184 m->count = start_pos;
3185 }
3186
3187 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3188 {
3189 struct binder_ref *ref;
3190 struct binder_work *w;
3191 int count;
3192
3193 count = 0;
3194 hlist_for_each_entry(ref, &node->refs, node_entry)
3195 count++;
3196
3197 seq_printf(m, " node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
3198 node->debug_id, node->ptr, node->cookie,
3199 node->has_strong_ref, node->has_weak_ref,
3200 node->local_strong_refs, node->local_weak_refs,
3201 node->internal_strong_refs, count);
3202 if (count) {
3203 seq_puts(m, " proc");
3204 hlist_for_each_entry(ref, &node->refs, node_entry)
3205 seq_printf(m, " %d", ref->proc->pid);
3206 }
3207 seq_puts(m, "\n");
3208 list_for_each_entry(w, &node->async_todo, entry)
3209 print_binder_work(m, " ",
3210 " pending async transaction", w);
3211 }
3212
3213 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3214 {
3215 seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %p\n",
3216 ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3217 ref->node->debug_id, ref->strong, ref->weak, ref->death);
3218 }
3219
3220 static void print_binder_proc(struct seq_file *m,
3221 struct binder_proc *proc, int print_all)
3222 {
3223 struct binder_work *w;
3224 struct rb_node *n;
3225 size_t start_pos = m->count;
3226 size_t header_pos;
3227
3228 seq_printf(m, "proc %d\n", proc->pid);
3229 header_pos = m->count;
3230
3231 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3232 print_binder_thread(m, rb_entry(n, struct binder_thread,
3233 rb_node), print_all);
3234 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3235 struct binder_node *node = rb_entry(n, struct binder_node,
3236 rb_node);
3237 if (print_all || node->has_async_transaction)
3238 print_binder_node(m, node);
3239 }
3240 if (print_all) {
3241 for (n = rb_first(&proc->refs_by_desc);
3242 n != NULL;
3243 n = rb_next(n))
3244 print_binder_ref(m, rb_entry(n, struct binder_ref,
3245 rb_node_desc));
3246 }
3247 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3248 print_binder_buffer(m, " buffer",
3249 rb_entry(n, struct binder_buffer, rb_node));
3250 list_for_each_entry(w, &proc->todo, entry)
3251 print_binder_work(m, " ", " pending transaction", w);
3252 list_for_each_entry(w, &proc->delivered_death, entry) {
3253 seq_puts(m, " has delivered dead binder\n");
3254 break;
3255 }
3256 if (!print_all && m->count == header_pos)
3257 m->count = start_pos;
3258 }
3259
3260 static const char * const binder_return_strings[] = {
3261 "BR_ERROR",
3262 "BR_OK",
3263 "BR_TRANSACTION",
3264 "BR_REPLY",
3265 "BR_ACQUIRE_RESULT",
3266 "BR_DEAD_REPLY",
3267 "BR_TRANSACTION_COMPLETE",
3268 "BR_INCREFS",
3269 "BR_ACQUIRE",
3270 "BR_RELEASE",
3271 "BR_DECREFS",
3272 "BR_ATTEMPT_ACQUIRE",
3273 "BR_NOOP",
3274 "BR_SPAWN_LOOPER",
3275 "BR_FINISHED",
3276 "BR_DEAD_BINDER",
3277 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3278 "BR_FAILED_REPLY"
3279 };
3280
3281 static const char * const binder_command_strings[] = {
3282 "BC_TRANSACTION",
3283 "BC_REPLY",
3284 "BC_ACQUIRE_RESULT",
3285 "BC_FREE_BUFFER",
3286 "BC_INCREFS",
3287 "BC_ACQUIRE",
3288 "BC_RELEASE",
3289 "BC_DECREFS",
3290 "BC_INCREFS_DONE",
3291 "BC_ACQUIRE_DONE",
3292 "BC_ATTEMPT_ACQUIRE",
3293 "BC_REGISTER_LOOPER",
3294 "BC_ENTER_LOOPER",
3295 "BC_EXIT_LOOPER",
3296 "BC_REQUEST_DEATH_NOTIFICATION",
3297 "BC_CLEAR_DEATH_NOTIFICATION",
3298 "BC_DEAD_BINDER_DONE"
3299 };
3300
3301 static const char * const binder_objstat_strings[] = {
3302 "proc",
3303 "thread",
3304 "node",
3305 "ref",
3306 "death",
3307 "transaction",
3308 "transaction_complete"
3309 };
3310
3311 static void print_binder_stats(struct seq_file *m, const char *prefix,
3312 struct binder_stats *stats)
3313 {
3314 int i;
3315
3316 BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3317 ARRAY_SIZE(binder_command_strings));
3318 for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3319 if (stats->bc[i])
3320 seq_printf(m, "%s%s: %d\n", prefix,
3321 binder_command_strings[i], stats->bc[i]);
3322 }
3323
3324 BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3325 ARRAY_SIZE(binder_return_strings));
3326 for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3327 if (stats->br[i])
3328 seq_printf(m, "%s%s: %d\n", prefix,
3329 binder_return_strings[i], stats->br[i]);
3330 }
3331
3332 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3333 ARRAY_SIZE(binder_objstat_strings));
3334 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3335 ARRAY_SIZE(stats->obj_deleted));
3336 for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3337 if (stats->obj_created[i] || stats->obj_deleted[i])
3338 seq_printf(m, "%s%s: active %d total %d\n", prefix,
3339 binder_objstat_strings[i],
3340 stats->obj_created[i] - stats->obj_deleted[i],
3341 stats->obj_created[i]);
3342 }
3343 }
3344
3345 static void print_binder_proc_stats(struct seq_file *m,
3346 struct binder_proc *proc)
3347 {
3348 struct binder_work *w;
3349 struct rb_node *n;
3350 int count, strong, weak;
3351
3352 seq_printf(m, "proc %d\n", proc->pid);
3353 count = 0;
3354 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3355 count++;
3356 seq_printf(m, " threads: %d\n", count);
3357 seq_printf(m, " requested threads: %d+%d/%d\n"
3358 " ready threads %d\n"
3359 " free async space %zd\n", proc->requested_threads,
3360 proc->requested_threads_started, proc->max_threads,
3361 proc->ready_threads, proc->free_async_space);
3362 count = 0;
3363 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3364 count++;
3365 seq_printf(m, " nodes: %d\n", count);
3366 count = 0;
3367 strong = 0;
3368 weak = 0;
3369 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3370 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3371 rb_node_desc);
3372 count++;
3373 strong += ref->strong;
3374 weak += ref->weak;
3375 }
3376 seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak);
3377
3378 count = 0;
3379 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3380 count++;
3381 seq_printf(m, " buffers: %d\n", count);
3382
3383 count = 0;
3384 list_for_each_entry(w, &proc->todo, entry) {
3385 switch (w->type) {
3386 case BINDER_WORK_TRANSACTION:
3387 count++;
3388 break;
3389 default:
3390 break;
3391 }
3392 }
3393 seq_printf(m, " pending transactions: %d\n", count);
3394
3395 print_binder_stats(m, " ", &proc->stats);
3396 }
3397
3398
3399 static int binder_state_show(struct seq_file *m, void *unused)
3400 {
3401 struct binder_proc *proc;
3402 struct binder_node *node;
3403 int do_lock = !binder_debug_no_lock;
3404
3405 if (do_lock)
3406 binder_lock(__func__);
3407
3408 seq_puts(m, "binder state:\n");
3409
3410 if (!hlist_empty(&binder_dead_nodes))
3411 seq_puts(m, "dead nodes:\n");
3412 hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3413 print_binder_node(m, node);
3414
3415 hlist_for_each_entry(proc, &binder_procs, proc_node)
3416 print_binder_proc(m, proc, 1);
3417 if (do_lock)
3418 binder_unlock(__func__);
3419 return 0;
3420 }
3421
3422 static int binder_stats_show(struct seq_file *m, void *unused)
3423 {
3424 struct binder_proc *proc;
3425 int do_lock = !binder_debug_no_lock;
3426
3427 if (do_lock)
3428 binder_lock(__func__);
3429
3430 seq_puts(m, "binder stats:\n");
3431
3432 print_binder_stats(m, "", &binder_stats);
3433
3434 hlist_for_each_entry(proc, &binder_procs, proc_node)
3435 print_binder_proc_stats(m, proc);
3436 if (do_lock)
3437 binder_unlock(__func__);
3438 return 0;
3439 }
3440
3441 static int binder_transactions_show(struct seq_file *m, void *unused)
3442 {
3443 struct binder_proc *proc;
3444 int do_lock = !binder_debug_no_lock;
3445
3446 if (do_lock)
3447 binder_lock(__func__);
3448
3449 seq_puts(m, "binder transactions:\n");
3450 hlist_for_each_entry(proc, &binder_procs, proc_node)
3451 print_binder_proc(m, proc, 0);
3452 if (do_lock)
3453 binder_unlock(__func__);
3454 return 0;
3455 }
3456
3457 static int binder_proc_show(struct seq_file *m, void *unused)
3458 {
3459 struct binder_proc *proc = m->private;
3460 int do_lock = !binder_debug_no_lock;
3461
3462 if (do_lock)
3463 binder_lock(__func__);
3464 seq_puts(m, "binder proc state:\n");
3465 print_binder_proc(m, proc, 1);
3466 if (do_lock)
3467 binder_unlock(__func__);
3468 return 0;
3469 }
3470
3471 static void print_binder_transaction_log_entry(struct seq_file *m,
3472 struct binder_transaction_log_entry *e)
3473 {
3474 seq_printf(m,
3475 "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3476 e->debug_id, (e->call_type == 2) ? "reply" :
3477 ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3478 e->from_thread, e->to_proc, e->to_thread, e->to_node,
3479 e->target_handle, e->data_size, e->offsets_size);
3480 }
3481
3482 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3483 {
3484 struct binder_transaction_log *log = m->private;
3485 int i;
3486
3487 if (log->full) {
3488 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3489 print_binder_transaction_log_entry(m, &log->entry[i]);
3490 }
3491 for (i = 0; i < log->next; i++)
3492 print_binder_transaction_log_entry(m, &log->entry[i]);
3493 return 0;
3494 }
3495
3496 static const struct file_operations binder_fops = {
3497 .owner = THIS_MODULE,
3498 .poll = binder_poll,
3499 .unlocked_ioctl = binder_ioctl,
3500 .mmap = binder_mmap,
3501 .open = binder_open,
3502 .flush = binder_flush,
3503 .release = binder_release,
3504 };
3505
3506 static struct miscdevice binder_miscdev = {
3507 .minor = MISC_DYNAMIC_MINOR,
3508 .name = "binder",
3509 .fops = &binder_fops
3510 };
3511
3512 BINDER_DEBUG_ENTRY(state);
3513 BINDER_DEBUG_ENTRY(stats);
3514 BINDER_DEBUG_ENTRY(transactions);
3515 BINDER_DEBUG_ENTRY(transaction_log);
3516
3517 static int __init binder_init(void)
3518 {
3519 int ret;
3520
3521 binder_deferred_workqueue = create_singlethread_workqueue("binder");
3522 if (!binder_deferred_workqueue)
3523 return -ENOMEM;
3524
3525 binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3526 if (binder_debugfs_dir_entry_root)
3527 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3528 binder_debugfs_dir_entry_root);
3529 ret = misc_register(&binder_miscdev);
3530 if (binder_debugfs_dir_entry_root) {
3531 debugfs_create_file("state",
3532 S_IRUGO,
3533 binder_debugfs_dir_entry_root,
3534 NULL,
3535 &binder_state_fops);
3536 debugfs_create_file("stats",
3537 S_IRUGO,
3538 binder_debugfs_dir_entry_root,
3539 NULL,
3540 &binder_stats_fops);
3541 debugfs_create_file("transactions",
3542 S_IRUGO,
3543 binder_debugfs_dir_entry_root,
3544 NULL,
3545 &binder_transactions_fops);
3546 debugfs_create_file("transaction_log",
3547 S_IRUGO,
3548 binder_debugfs_dir_entry_root,
3549 &binder_transaction_log,
3550 &binder_transaction_log_fops);
3551 debugfs_create_file("failed_transaction_log",
3552 S_IRUGO,
3553 binder_debugfs_dir_entry_root,
3554 &binder_transaction_log_failed,
3555 &binder_transaction_log_fops);
3556 }
3557 return ret;
3558 }
3559
3560 device_initcall(binder_init);
3561
3562 #define CREATE_TRACE_POINTS
3563 #include "binder_trace.h"
3564
3565 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support