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ext4: fix undefined behavior in ext4_fill_flex_info()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / android / binder.c
blob99010d4b3044b2c33c9d709e334b5be7871b9599
1 /* binder.c
2 *
3 * Android IPC Subsystem
4 *
5 * Copyright (C) 2007-2008 Google, Inc.
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #include <asm/cacheflush.h>
19 #include <linux/fdtable.h>
20 #include <linux/file.h>
21 #include <linux/fs.h>
22 #include <linux/list.h>
23 #include <linux/miscdevice.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/mutex.h>
27 #include <linux/nsproxy.h>
28 #include <linux/poll.h>
29 #include <linux/proc_fs.h>
30 #include <linux/rbtree.h>
31 #include <linux/sched.h>
32 #include <linux/uaccess.h>
33 #include <linux/vmalloc.h>
34
35 #include "binder.h"
36
37 static DEFINE_MUTEX(binder_lock);
38 static DEFINE_MUTEX(binder_deferred_lock);
39
40 static HLIST_HEAD(binder_procs);
41 static HLIST_HEAD(binder_deferred_list);
42 static HLIST_HEAD(binder_dead_nodes);
43
44 static struct proc_dir_entry *binder_proc_dir_entry_root;
45 static struct proc_dir_entry *binder_proc_dir_entry_proc;
46 static struct binder_node *binder_context_mgr_node;
47 static uid_t binder_context_mgr_uid = -1;
48 static int binder_last_id;
49
50 static int binder_read_proc_proc(char *page, char **start, off_t off,
51 int count, int *eof, void *data);
52
53 /* This is only defined in include/asm-arm/sizes.h */
54 #ifndef SZ_1K
55 #define SZ_1K 0x400
56 #endif
57
58 #ifndef SZ_4M
59 #define SZ_4M 0x400000
60 #endif
61
62 #define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
63
64 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
65
66 enum {
67 BINDER_DEBUG_USER_ERROR = 1U << 0,
68 BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
69 BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
70 BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
71 BINDER_DEBUG_DEAD_BINDER = 1U << 4,
72 BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
73 BINDER_DEBUG_READ_WRITE = 1U << 6,
74 BINDER_DEBUG_USER_REFS = 1U << 7,
75 BINDER_DEBUG_THREADS = 1U << 8,
76 BINDER_DEBUG_TRANSACTION = 1U << 9,
77 BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
78 BINDER_DEBUG_FREE_BUFFER = 1U << 11,
79 BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
80 BINDER_DEBUG_BUFFER_ALLOC = 1U << 13,
81 BINDER_DEBUG_PRIORITY_CAP = 1U << 14,
82 BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 15,
83 };
84 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
85 BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
86 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
87
88 static int binder_debug_no_lock;
89 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
90
91 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
92 static int binder_stop_on_user_error;
93
94 static int binder_set_stop_on_user_error(const char *val,
95 struct kernel_param *kp)
96 {
97 int ret;
98 ret = param_set_int(val, kp);
99 if (binder_stop_on_user_error < 2)
100 wake_up(&binder_user_error_wait);
101 return ret;
102 }
103 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
104 param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
105
106 #define binder_debug(mask, x...) \
107 do { \
108 if (binder_debug_mask & mask) \
109 printk(KERN_INFO x); \
110 } while (0)
111
112 #define binder_user_error(x...) \
113 do { \
114 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
115 printk(KERN_INFO x); \
116 if (binder_stop_on_user_error) \
117 binder_stop_on_user_error = 2; \
118 } while (0)
119
120 enum binder_stat_types {
121 BINDER_STAT_PROC,
122 BINDER_STAT_THREAD,
123 BINDER_STAT_NODE,
124 BINDER_STAT_REF,
125 BINDER_STAT_DEATH,
126 BINDER_STAT_TRANSACTION,
127 BINDER_STAT_TRANSACTION_COMPLETE,
128 BINDER_STAT_COUNT
129 };
130
131 struct binder_stats {
132 int br[_IOC_NR(BR_FAILED_REPLY) + 1];
133 int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
134 int obj_created[BINDER_STAT_COUNT];
135 int obj_deleted[BINDER_STAT_COUNT];
136 };
137
138 static struct binder_stats binder_stats;
139
140 static inline void binder_stats_deleted(enum binder_stat_types type)
141 {
142 binder_stats.obj_deleted[type]++;
143 }
144
145 static inline void binder_stats_created(enum binder_stat_types type)
146 {
147 binder_stats.obj_created[type]++;
148 }
149
150 struct binder_transaction_log_entry {
151 int debug_id;
152 int call_type;
153 int from_proc;
154 int from_thread;
155 int target_handle;
156 int to_proc;
157 int to_thread;
158 int to_node;
159 int data_size;
160 int offsets_size;
161 };
162 struct binder_transaction_log {
163 int next;
164 int full;
165 struct binder_transaction_log_entry entry[32];
166 };
167 static struct binder_transaction_log binder_transaction_log;
168 static struct binder_transaction_log binder_transaction_log_failed;
169
170 static struct binder_transaction_log_entry *binder_transaction_log_add(
171 struct binder_transaction_log *log)
172 {
173 struct binder_transaction_log_entry *e;
174 e = &log->entry[log->next];
175 memset(e, 0, sizeof(*e));
176 log->next++;
177 if (log->next == ARRAY_SIZE(log->entry)) {
178 log->next = 0;
179 log->full = 1;
180 }
181 return e;
182 }
183
184 struct binder_work {
185 struct list_head entry;
186 enum {
187 BINDER_WORK_TRANSACTION = 1,
188 BINDER_WORK_TRANSACTION_COMPLETE,
189 BINDER_WORK_NODE,
190 BINDER_WORK_DEAD_BINDER,
191 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
192 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
193 } type;
194 };
195
196 struct binder_node {
197 int debug_id;
198 struct binder_work work;
199 union {
200 struct rb_node rb_node;
201 struct hlist_node dead_node;
202 };
203 struct binder_proc *proc;
204 struct hlist_head refs;
205 int internal_strong_refs;
206 int local_weak_refs;
207 int local_strong_refs;
208 void __user *ptr;
209 void __user *cookie;
210 unsigned has_strong_ref:1;
211 unsigned pending_strong_ref:1;
212 unsigned has_weak_ref:1;
213 unsigned pending_weak_ref:1;
214 unsigned has_async_transaction:1;
215 unsigned accept_fds:1;
216 unsigned min_priority:8;
217 struct list_head async_todo;
218 };
219
220 struct binder_ref_death {
221 struct binder_work work;
222 void __user *cookie;
223 };
224
225 struct binder_ref {
226 /* Lookups needed: */
227 /* node + proc => ref (transaction) */
228 /* desc + proc => ref (transaction, inc/dec ref) */
229 /* node => refs + procs (proc exit) */
230 int debug_id;
231 struct rb_node rb_node_desc;
232 struct rb_node rb_node_node;
233 struct hlist_node node_entry;
234 struct binder_proc *proc;
235 struct binder_node *node;
236 uint32_t desc;
237 int strong;
238 int weak;
239 struct binder_ref_death *death;
240 };
241
242 struct binder_buffer {
243 struct list_head entry; /* free and allocated entries by addesss */
244 struct rb_node rb_node; /* free entry by size or allocated entry */
245 /* by address */
246 unsigned free:1;
247 unsigned allow_user_free:1;
248 unsigned async_transaction:1;
249 unsigned debug_id:29;
250
251 struct binder_transaction *transaction;
252
253 struct binder_node *target_node;
254 size_t data_size;
255 size_t offsets_size;
256 uint8_t data[0];
257 };
258
259 enum binder_deferred_state {
260 BINDER_DEFERRED_PUT_FILES = 0x01,
261 BINDER_DEFERRED_FLUSH = 0x02,
262 BINDER_DEFERRED_RELEASE = 0x04,
263 };
264
265 struct binder_proc {
266 struct hlist_node proc_node;
267 struct rb_root threads;
268 struct rb_root nodes;
269 struct rb_root refs_by_desc;
270 struct rb_root refs_by_node;
271 int pid;
272 struct vm_area_struct *vma;
273 struct task_struct *tsk;
274 struct files_struct *files;
275 struct hlist_node deferred_work_node;
276 int deferred_work;
277 void *buffer;
278 ptrdiff_t user_buffer_offset;
279
280 struct list_head buffers;
281 struct rb_root free_buffers;
282 struct rb_root allocated_buffers;
283 size_t free_async_space;
284
285 struct page **pages;
286 size_t buffer_size;
287 uint32_t buffer_free;
288 struct list_head todo;
289 wait_queue_head_t wait;
290 struct binder_stats stats;
291 struct list_head delivered_death;
292 int max_threads;
293 int requested_threads;
294 int requested_threads_started;
295 int ready_threads;
296 long default_priority;
297 };
298
299 enum {
300 BINDER_LOOPER_STATE_REGISTERED = 0x01,
301 BINDER_LOOPER_STATE_ENTERED = 0x02,
302 BINDER_LOOPER_STATE_EXITED = 0x04,
303 BINDER_LOOPER_STATE_INVALID = 0x08,
304 BINDER_LOOPER_STATE_WAITING = 0x10,
305 BINDER_LOOPER_STATE_NEED_RETURN = 0x20
306 };
307
308 struct binder_thread {
309 struct binder_proc *proc;
310 struct rb_node rb_node;
311 int pid;
312 int looper;
313 struct binder_transaction *transaction_stack;
314 struct list_head todo;
315 uint32_t return_error; /* Write failed, return error code in read buf */
316 uint32_t return_error2; /* Write failed, return error code in read */
317 /* buffer. Used when sending a reply to a dead process that */
318 /* we are also waiting on */
319 wait_queue_head_t wait;
320 struct binder_stats stats;
321 };
322
323 struct binder_transaction {
324 int debug_id;
325 struct binder_work work;
326 struct binder_thread *from;
327 struct binder_transaction *from_parent;
328 struct binder_proc *to_proc;
329 struct binder_thread *to_thread;
330 struct binder_transaction *to_parent;
331 unsigned need_reply:1;
332 /* unsigned is_dead:1; */ /* not used at the moment */
333
334 struct binder_buffer *buffer;
335 unsigned int code;
336 unsigned int flags;
337 long priority;
338 long saved_priority;
339 uid_t sender_euid;
340 };
341
342 static void
343 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
344
345 /*
346 * copied from get_unused_fd_flags
347 */
348 int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
349 {
350 struct files_struct *files = proc->files;
351 int fd, error;
352 struct fdtable *fdt;
353 unsigned long rlim_cur;
354 unsigned long irqs;
355
356 if (files == NULL)
357 return -ESRCH;
358
359 error = -EMFILE;
360 spin_lock(&files->file_lock);
361
362 repeat:
363 fdt = files_fdtable(files);
364 fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
365 files->next_fd);
366
367 /*
368 * N.B. For clone tasks sharing a files structure, this test
369 * will limit the total number of files that can be opened.
370 */
371 rlim_cur = 0;
372 if (lock_task_sighand(proc->tsk, &irqs)) {
373 rlim_cur = proc->tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
374 unlock_task_sighand(proc->tsk, &irqs);
375 }
376 if (fd >= rlim_cur)
377 goto out;
378
379 /* Do we need to expand the fd array or fd set? */
380 error = expand_files(files, fd);
381 if (error < 0)
382 goto out;
383
384 if (error) {
385 /*
386 * If we needed to expand the fs array we
387 * might have blocked - try again.
388 */
389 error = -EMFILE;
390 goto repeat;
391 }
392
393 FD_SET(fd, fdt->open_fds);
394 if (flags & O_CLOEXEC)
395 FD_SET(fd, fdt->close_on_exec);
396 else
397 FD_CLR(fd, fdt->close_on_exec);
398 files->next_fd = fd + 1;
399 #if 1
400 /* Sanity check */
401 if (fdt->fd[fd] != NULL) {
402 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
403 fdt->fd[fd] = NULL;
404 }
405 #endif
406 error = fd;
407
408 out:
409 spin_unlock(&files->file_lock);
410 return error;
411 }
412
413 /*
414 * copied from fd_install
415 */
416 static void task_fd_install(
417 struct binder_proc *proc, unsigned int fd, struct file *file)
418 {
419 struct files_struct *files = proc->files;
420 struct fdtable *fdt;
421
422 if (files == NULL)
423 return;
424
425 spin_lock(&files->file_lock);
426 fdt = files_fdtable(files);
427 BUG_ON(fdt->fd[fd] != NULL);
428 rcu_assign_pointer(fdt->fd[fd], file);
429 spin_unlock(&files->file_lock);
430 }
431
432 /*
433 * copied from __put_unused_fd in open.c
434 */
435 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
436 {
437 struct fdtable *fdt = files_fdtable(files);
438 __FD_CLR(fd, fdt->open_fds);
439 if (fd < files->next_fd)
440 files->next_fd = fd;
441 }
442
443 /*
444 * copied from sys_close
445 */
446 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
447 {
448 struct file *filp;
449 struct files_struct *files = proc->files;
450 struct fdtable *fdt;
451 int retval;
452
453 if (files == NULL)
454 return -ESRCH;
455
456 spin_lock(&files->file_lock);
457 fdt = files_fdtable(files);
458 if (fd >= fdt->max_fds)
459 goto out_unlock;
460 filp = fdt->fd[fd];
461 if (!filp)
462 goto out_unlock;
463 rcu_assign_pointer(fdt->fd[fd], NULL);
464 FD_CLR(fd, fdt->close_on_exec);
465 __put_unused_fd(files, fd);
466 spin_unlock(&files->file_lock);
467 retval = filp_close(filp, files);
468
469 /* can't restart close syscall because file table entry was cleared */
470 if (unlikely(retval == -ERESTARTSYS ||
471 retval == -ERESTARTNOINTR ||
472 retval == -ERESTARTNOHAND ||
473 retval == -ERESTART_RESTARTBLOCK))
474 retval = -EINTR;
475
476 return retval;
477
478 out_unlock:
479 spin_unlock(&files->file_lock);
480 return -EBADF;
481 }
482
483 static void binder_set_nice(long nice)
484 {
485 long min_nice;
486 if (can_nice(current, nice)) {
487 set_user_nice(current, nice);
488 return;
489 }
490 min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
491 binder_debug(BINDER_DEBUG_PRIORITY_CAP,
492 "binder: %d: nice value %ld not allowed use "
493 "%ld instead\n", current->pid, nice, min_nice);
494 set_user_nice(current, min_nice);
495 if (min_nice < 20)
496 return;
497 binder_user_error("binder: %d RLIMIT_NICE not set\n", current->pid);
498 }
499
500 static size_t binder_buffer_size(struct binder_proc *proc,
501 struct binder_buffer *buffer)
502 {
503 if (list_is_last(&buffer->entry, &proc->buffers))
504 return proc->buffer + proc->buffer_size - (void *)buffer->data;
505 else
506 return (size_t)list_entry(buffer->entry.next,
507 struct binder_buffer, entry) - (size_t)buffer->data;
508 }
509
510 static void binder_insert_free_buffer(struct binder_proc *proc,
511 struct binder_buffer *new_buffer)
512 {
513 struct rb_node **p = &proc->free_buffers.rb_node;
514 struct rb_node *parent = NULL;
515 struct binder_buffer *buffer;
516 size_t buffer_size;
517 size_t new_buffer_size;
518
519 BUG_ON(!new_buffer->free);
520
521 new_buffer_size = binder_buffer_size(proc, new_buffer);
522
523 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
524 "binder: %d: add free buffer, size %zd, "
525 "at %p\n", proc->pid, new_buffer_size, new_buffer);
526
527 while (*p) {
528 parent = *p;
529 buffer = rb_entry(parent, struct binder_buffer, rb_node);
530 BUG_ON(!buffer->free);
531
532 buffer_size = binder_buffer_size(proc, buffer);
533
534 if (new_buffer_size < buffer_size)
535 p = &parent->rb_left;
536 else
537 p = &parent->rb_right;
538 }
539 rb_link_node(&new_buffer->rb_node, parent, p);
540 rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
541 }
542
543 static void binder_insert_allocated_buffer(struct binder_proc *proc,
544 struct binder_buffer *new_buffer)
545 {
546 struct rb_node **p = &proc->allocated_buffers.rb_node;
547 struct rb_node *parent = NULL;
548 struct binder_buffer *buffer;
549
550 BUG_ON(new_buffer->free);
551
552 while (*p) {
553 parent = *p;
554 buffer = rb_entry(parent, struct binder_buffer, rb_node);
555 BUG_ON(buffer->free);
556
557 if (new_buffer < buffer)
558 p = &parent->rb_left;
559 else if (new_buffer > buffer)
560 p = &parent->rb_right;
561 else
562 BUG();
563 }
564 rb_link_node(&new_buffer->rb_node, parent, p);
565 rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
566 }
567
568 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
569 void __user *user_ptr)
570 {
571 struct rb_node *n = proc->allocated_buffers.rb_node;
572 struct binder_buffer *buffer;
573 struct binder_buffer *kern_ptr;
574
575 kern_ptr = user_ptr - proc->user_buffer_offset
576 - offsetof(struct binder_buffer, data);
577
578 while (n) {
579 buffer = rb_entry(n, struct binder_buffer, rb_node);
580 BUG_ON(buffer->free);
581
582 if (kern_ptr < buffer)
583 n = n->rb_left;
584 else if (kern_ptr > buffer)
585 n = n->rb_right;
586 else
587 return buffer;
588 }
589 return NULL;
590 }
591
592 static int binder_update_page_range(struct binder_proc *proc, int allocate,
593 void *start, void *end,
594 struct vm_area_struct *vma)
595 {
596 void *page_addr;
597 unsigned long user_page_addr;
598 struct vm_struct tmp_area;
599 struct page **page;
600 struct mm_struct *mm;
601
602 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
603 "binder: %d: %s pages %p-%p\n", proc->pid,
604 allocate ? "allocate" : "free", start, end);
605
606 if (end <= start)
607 return 0;
608
609 if (vma)
610 mm = NULL;
611 else
612 mm = get_task_mm(proc->tsk);
613
614 if (mm) {
615 down_write(&mm->mmap_sem);
616 vma = proc->vma;
617 }
618
619 if (allocate == 0)
620 goto free_range;
621
622 if (vma == NULL) {
623 printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
624 "map pages in userspace, no vma\n", proc->pid);
625 goto err_no_vma;
626 }
627
628 for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
629 int ret;
630 struct page **page_array_ptr;
631 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
632
633 BUG_ON(*page);
634 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
635 if (*page == NULL) {
636 printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
637 "for page at %p\n", proc->pid, page_addr);
638 goto err_alloc_page_failed;
639 }
640 tmp_area.addr = page_addr;
641 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
642 page_array_ptr = page;
643 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
644 if (ret) {
645 printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
646 "to map page at %p in kernel\n",
647 proc->pid, page_addr);
648 goto err_map_kernel_failed;
649 }
650 user_page_addr =
651 (uintptr_t)page_addr + proc->user_buffer_offset;
652 ret = vm_insert_page(vma, user_page_addr, page[0]);
653 if (ret) {
654 printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
655 "to map page at %lx in userspace\n",
656 proc->pid, user_page_addr);
657 goto err_vm_insert_page_failed;
658 }
659 /* vm_insert_page does not seem to increment the refcount */
660 }
661 if (mm) {
662 up_write(&mm->mmap_sem);
663 mmput(mm);
664 }
665 return 0;
666
667 free_range:
668 for (page_addr = end - PAGE_SIZE; page_addr >= start;
669 page_addr -= PAGE_SIZE) {
670 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
671 if (vma)
672 zap_page_range(vma, (uintptr_t)page_addr +
673 proc->user_buffer_offset, PAGE_SIZE, NULL);
674 err_vm_insert_page_failed:
675 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
676 err_map_kernel_failed:
677 __free_page(*page);
678 *page = NULL;
679 err_alloc_page_failed:
680 ;
681 }
682 err_no_vma:
683 if (mm) {
684 up_write(&mm->mmap_sem);
685 mmput(mm);
686 }
687 return -ENOMEM;
688 }
689
690 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
691 size_t data_size,
692 size_t offsets_size, int is_async)
693 {
694 struct rb_node *n = proc->free_buffers.rb_node;
695 struct binder_buffer *buffer;
696 size_t buffer_size;
697 struct rb_node *best_fit = NULL;
698 void *has_page_addr;
699 void *end_page_addr;
700 size_t size;
701
702 if (proc->vma == NULL) {
703 printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma\n",
704 proc->pid);
705 return NULL;
706 }
707
708 size = ALIGN(data_size, sizeof(void *)) +
709 ALIGN(offsets_size, sizeof(void *));
710
711 if (size < data_size || size < offsets_size) {
712 binder_user_error("binder: %d: got transaction with invalid "
713 "size %zd-%zd\n", proc->pid, data_size, offsets_size);
714 return NULL;
715 }
716
717 if (is_async &&
718 proc->free_async_space < size + sizeof(struct binder_buffer)) {
719 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
720 "binder: %d: binder_alloc_buf size %zd"
721 "failed, no async space left\n", proc->pid, size);
722 return NULL;
723 }
724
725 while (n) {
726 buffer = rb_entry(n, struct binder_buffer, rb_node);
727 BUG_ON(!buffer->free);
728 buffer_size = binder_buffer_size(proc, buffer);
729
730 if (size < buffer_size) {
731 best_fit = n;
732 n = n->rb_left;
733 } else if (size > buffer_size)
734 n = n->rb_right;
735 else {
736 best_fit = n;
737 break;
738 }
739 }
740 if (best_fit == NULL) {
741 printk(KERN_ERR "binder: %d: binder_alloc_buf size %zd failed, "
742 "no address space\n", proc->pid, size);
743 return NULL;
744 }
745 if (n == NULL) {
746 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
747 buffer_size = binder_buffer_size(proc, buffer);
748 }
749
750 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
751 "binder: %d: binder_alloc_buf size %zd got buff"
752 "er %p size %zd\n", proc->pid, size, buffer, buffer_size);
753
754 has_page_addr =
755 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
756 if (n == NULL) {
757 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
758 buffer_size = size; /* no room for other buffers */
759 else
760 buffer_size = size + sizeof(struct binder_buffer);
761 }
762 end_page_addr =
763 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
764 if (end_page_addr > has_page_addr)
765 end_page_addr = has_page_addr;
766 if (binder_update_page_range(proc, 1,
767 (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
768 return NULL;
769
770 rb_erase(best_fit, &proc->free_buffers);
771 buffer->free = 0;
772 binder_insert_allocated_buffer(proc, buffer);
773 if (buffer_size != size) {
774 struct binder_buffer *new_buffer = (void *)buffer->data + size;
775 list_add(&new_buffer->entry, &buffer->entry);
776 new_buffer->free = 1;
777 binder_insert_free_buffer(proc, new_buffer);
778 }
779 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
780 "binder: %d: binder_alloc_buf size %zd got "
781 "%p\n", proc->pid, size, buffer);
782 buffer->data_size = data_size;
783 buffer->offsets_size = offsets_size;
784 buffer->async_transaction = is_async;
785 if (is_async) {
786 proc->free_async_space -= size + sizeof(struct binder_buffer);
787 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
788 "binder: %d: binder_alloc_buf size %zd "
789 "async free %zd\n", proc->pid, size,
790 proc->free_async_space);
791 }
792
793 return buffer;
794 }
795
796 static void *buffer_start_page(struct binder_buffer *buffer)
797 {
798 return (void *)((uintptr_t)buffer & PAGE_MASK);
799 }
800
801 static void *buffer_end_page(struct binder_buffer *buffer)
802 {
803 return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
804 }
805
806 static void binder_delete_free_buffer(struct binder_proc *proc,
807 struct binder_buffer *buffer)
808 {
809 struct binder_buffer *prev, *next = NULL;
810 int free_page_end = 1;
811 int free_page_start = 1;
812
813 BUG_ON(proc->buffers.next == &buffer->entry);
814 prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
815 BUG_ON(!prev->free);
816 if (buffer_end_page(prev) == buffer_start_page(buffer)) {
817 free_page_start = 0;
818 if (buffer_end_page(prev) == buffer_end_page(buffer))
819 free_page_end = 0;
820 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
821 "binder: %d: merge free, buffer %p "
822 "share page with %p\n", proc->pid, buffer, prev);
823 }
824
825 if (!list_is_last(&buffer->entry, &proc->buffers)) {
826 next = list_entry(buffer->entry.next,
827 struct binder_buffer, entry);
828 if (buffer_start_page(next) == buffer_end_page(buffer)) {
829 free_page_end = 0;
830 if (buffer_start_page(next) ==
831 buffer_start_page(buffer))
832 free_page_start = 0;
833 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
834 "binder: %d: merge free, buffer"
835 " %p share page with %p\n", proc->pid,
836 buffer, prev);
837 }
838 }
839 list_del(&buffer->entry);
840 if (free_page_start || free_page_end) {
841 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
842 "binder: %d: merge free, buffer %p do "
843 "not share page%s%s with with %p or %p\n",
844 proc->pid, buffer, free_page_start ? "" : " end",
845 free_page_end ? "" : " start", prev, next);
846 binder_update_page_range(proc, 0, free_page_start ?
847 buffer_start_page(buffer) : buffer_end_page(buffer),
848 (free_page_end ? buffer_end_page(buffer) :
849 buffer_start_page(buffer)) + PAGE_SIZE, NULL);
850 }
851 }
852
853 static void binder_free_buf(struct binder_proc *proc,
854 struct binder_buffer *buffer)
855 {
856 size_t size, buffer_size;
857
858 buffer_size = binder_buffer_size(proc, buffer);
859
860 size = ALIGN(buffer->data_size, sizeof(void *)) +
861 ALIGN(buffer->offsets_size, sizeof(void *));
862
863 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
864 "binder: %d: binder_free_buf %p size %zd buffer"
865 "_size %zd\n", proc->pid, buffer, size, buffer_size);
866
867 BUG_ON(buffer->free);
868 BUG_ON(size > buffer_size);
869 BUG_ON(buffer->transaction != NULL);
870 BUG_ON((void *)buffer < proc->buffer);
871 BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
872
873 if (buffer->async_transaction) {
874 proc->free_async_space += size + sizeof(struct binder_buffer);
875
876 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
877 "binder: %d: binder_free_buf size %zd "
878 "async free %zd\n", proc->pid, size,
879 proc->free_async_space);
880 }
881
882 binder_update_page_range(proc, 0,
883 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
884 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
885 NULL);
886 rb_erase(&buffer->rb_node, &proc->allocated_buffers);
887 buffer->free = 1;
888 if (!list_is_last(&buffer->entry, &proc->buffers)) {
889 struct binder_buffer *next = list_entry(buffer->entry.next,
890 struct binder_buffer, entry);
891 if (next->free) {
892 rb_erase(&next->rb_node, &proc->free_buffers);
893 binder_delete_free_buffer(proc, next);
894 }
895 }
896 if (proc->buffers.next != &buffer->entry) {
897 struct binder_buffer *prev = list_entry(buffer->entry.prev,
898 struct binder_buffer, entry);
899 if (prev->free) {
900 binder_delete_free_buffer(proc, buffer);
901 rb_erase(&prev->rb_node, &proc->free_buffers);
902 buffer = prev;
903 }
904 }
905 binder_insert_free_buffer(proc, buffer);
906 }
907
908 static struct binder_node *binder_get_node(struct binder_proc *proc,
909 void __user *ptr)
910 {
911 struct rb_node *n = proc->nodes.rb_node;
912 struct binder_node *node;
913
914 while (n) {
915 node = rb_entry(n, struct binder_node, rb_node);
916
917 if (ptr < node->ptr)
918 n = n->rb_left;
919 else if (ptr > node->ptr)
920 n = n->rb_right;
921 else
922 return node;
923 }
924 return NULL;
925 }
926
927 static struct binder_node *binder_new_node(struct binder_proc *proc,
928 void __user *ptr,
929 void __user *cookie)
930 {
931 struct rb_node **p = &proc->nodes.rb_node;
932 struct rb_node *parent = NULL;
933 struct binder_node *node;
934
935 while (*p) {
936 parent = *p;
937 node = rb_entry(parent, struct binder_node, rb_node);
938
939 if (ptr < node->ptr)
940 p = &(*p)->rb_left;
941 else if (ptr > node->ptr)
942 p = &(*p)->rb_right;
943 else
944 return NULL;
945 }
946
947 node = kzalloc(sizeof(*node), GFP_KERNEL);
948 if (node == NULL)
949 return NULL;
950 binder_stats_created(BINDER_STAT_NODE);
951 rb_link_node(&node->rb_node, parent, p);
952 rb_insert_color(&node->rb_node, &proc->nodes);
953 node->debug_id = ++binder_last_id;
954 node->proc = proc;
955 node->ptr = ptr;
956 node->cookie = cookie;
957 node->work.type = BINDER_WORK_NODE;
958 INIT_LIST_HEAD(&node->work.entry);
959 INIT_LIST_HEAD(&node->async_todo);
960 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
961 "binder: %d:%d node %d u%p c%p created\n",
962 proc->pid, current->pid, node->debug_id,
963 node->ptr, node->cookie);
964 return node;
965 }
966
967 static int binder_inc_node(struct binder_node *node, int strong, int internal,
968 struct list_head *target_list)
969 {
970 if (strong) {
971 if (internal) {
972 if (target_list == NULL &&
973 node->internal_strong_refs == 0 &&
974 !(node == binder_context_mgr_node &&
975 node->has_strong_ref)) {
976 printk(KERN_ERR "binder: invalid inc strong "
977 "node for %d\n", node->debug_id);
978 return -EINVAL;
979 }
980 node->internal_strong_refs++;
981 } else
982 node->local_strong_refs++;
983 if (!node->has_strong_ref && target_list) {
984 list_del_init(&node->work.entry);
985 list_add_tail(&node->work.entry, target_list);
986 }
987 } else {
988 if (!internal)
989 node->local_weak_refs++;
990 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
991 if (target_list == NULL) {
992 printk(KERN_ERR "binder: invalid inc weak node "
993 "for %d\n", node->debug_id);
994 return -EINVAL;
995 }
996 list_add_tail(&node->work.entry, target_list);
997 }
998 }
999 return 0;
1000 }
1001
1002 static int binder_dec_node(struct binder_node *node, int strong, int internal)
1003 {
1004 if (strong) {
1005 if (internal)
1006 node->internal_strong_refs--;
1007 else
1008 node->local_strong_refs--;
1009 if (node->local_strong_refs || node->internal_strong_refs)
1010 return 0;
1011 } else {
1012 if (!internal)
1013 node->local_weak_refs--;
1014 if (node->local_weak_refs || !hlist_empty(&node->refs))
1015 return 0;
1016 }
1017 if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
1018 if (list_empty(&node->work.entry)) {
1019 list_add_tail(&node->work.entry, &node->proc->todo);
1020 wake_up_interruptible(&node->proc->wait);
1021 }
1022 } else {
1023 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1024 !node->local_weak_refs) {
1025 list_del_init(&node->work.entry);
1026 if (node->proc) {
1027 rb_erase(&node->rb_node, &node->proc->nodes);
1028 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1029 "binder: refless node %d deleted\n",
1030 node->debug_id);
1031 } else {
1032 hlist_del(&node->dead_node);
1033 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1034 "binder: dead node %d deleted\n",
1035 node->debug_id);
1036 }
1037 kfree(node);
1038 binder_stats_deleted(BINDER_STAT_NODE);
1039 }
1040 }
1041
1042 return 0;
1043 }
1044
1045
1046 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1047 uint32_t desc)
1048 {
1049 struct rb_node *n = proc->refs_by_desc.rb_node;
1050 struct binder_ref *ref;
1051
1052 while (n) {
1053 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1054
1055 if (desc < ref->desc)
1056 n = n->rb_left;
1057 else if (desc > ref->desc)
1058 n = n->rb_right;
1059 else
1060 return ref;
1061 }
1062 return NULL;
1063 }
1064
1065 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1066 struct binder_node *node)
1067 {
1068 struct rb_node *n;
1069 struct rb_node **p = &proc->refs_by_node.rb_node;
1070 struct rb_node *parent = NULL;
1071 struct binder_ref *ref, *new_ref;
1072
1073 while (*p) {
1074 parent = *p;
1075 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1076
1077 if (node < ref->node)
1078 p = &(*p)->rb_left;
1079 else if (node > ref->node)
1080 p = &(*p)->rb_right;
1081 else
1082 return ref;
1083 }
1084 new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1085 if (new_ref == NULL)
1086 return NULL;
1087 binder_stats_created(BINDER_STAT_REF);
1088 new_ref->debug_id = ++binder_last_id;
1089 new_ref->proc = proc;
1090 new_ref->node = node;
1091 rb_link_node(&new_ref->rb_node_node, parent, p);
1092 rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1093
1094 new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1095 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1096 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1097 if (ref->desc > new_ref->desc)
1098 break;
1099 new_ref->desc = ref->desc + 1;
1100 }
1101
1102 p = &proc->refs_by_desc.rb_node;
1103 while (*p) {
1104 parent = *p;
1105 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1106
1107 if (new_ref->desc < ref->desc)
1108 p = &(*p)->rb_left;
1109 else if (new_ref->desc > ref->desc)
1110 p = &(*p)->rb_right;
1111 else
1112 BUG();
1113 }
1114 rb_link_node(&new_ref->rb_node_desc, parent, p);
1115 rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1116 if (node) {
1117 hlist_add_head(&new_ref->node_entry, &node->refs);
1118
1119 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1120 "binder: %d new ref %d desc %d for "
1121 "node %d\n", proc->pid, new_ref->debug_id,
1122 new_ref->desc, node->debug_id);
1123 } else {
1124 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1125 "binder: %d new ref %d desc %d for "
1126 "dead node\n", proc->pid, new_ref->debug_id,
1127 new_ref->desc);
1128 }
1129 return new_ref;
1130 }
1131
1132 static void binder_delete_ref(struct binder_ref *ref)
1133 {
1134 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1135 "binder: %d delete ref %d desc %d for "
1136 "node %d\n", ref->proc->pid, ref->debug_id,
1137 ref->desc, ref->node->debug_id);
1138
1139 rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1140 rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1141 if (ref->strong)
1142 binder_dec_node(ref->node, 1, 1);
1143 hlist_del(&ref->node_entry);
1144 binder_dec_node(ref->node, 0, 1);
1145 if (ref->death) {
1146 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1147 "binder: %d delete ref %d desc %d "
1148 "has death notification\n", ref->proc->pid,
1149 ref->debug_id, ref->desc);
1150 list_del(&ref->death->work.entry);
1151 kfree(ref->death);
1152 binder_stats_deleted(BINDER_STAT_DEATH);
1153 }
1154 kfree(ref);
1155 binder_stats_deleted(BINDER_STAT_REF);
1156 }
1157
1158 static int binder_inc_ref(struct binder_ref *ref, int strong,
1159 struct list_head *target_list)
1160 {
1161 int ret;
1162 if (strong) {
1163 if (ref->strong == 0) {
1164 ret = binder_inc_node(ref->node, 1, 1, target_list);
1165 if (ret)
1166 return ret;
1167 }
1168 ref->strong++;
1169 } else {
1170 if (ref->weak == 0) {
1171 ret = binder_inc_node(ref->node, 0, 1, target_list);
1172 if (ret)
1173 return ret;
1174 }
1175 ref->weak++;
1176 }
1177 return 0;
1178 }
1179
1180
1181 static int binder_dec_ref(struct binder_ref *ref, int strong)
1182 {
1183 if (strong) {
1184 if (ref->strong == 0) {
1185 binder_user_error("binder: %d invalid dec strong, "
1186 "ref %d desc %d s %d w %d\n",
1187 ref->proc->pid, ref->debug_id,
1188 ref->desc, ref->strong, ref->weak);
1189 return -EINVAL;
1190 }
1191 ref->strong--;
1192 if (ref->strong == 0) {
1193 int ret;
1194 ret = binder_dec_node(ref->node, strong, 1);
1195 if (ret)
1196 return ret;
1197 }
1198 } else {
1199 if (ref->weak == 0) {
1200 binder_user_error("binder: %d invalid dec weak, "
1201 "ref %d desc %d s %d w %d\n",
1202 ref->proc->pid, ref->debug_id,
1203 ref->desc, ref->strong, ref->weak);
1204 return -EINVAL;
1205 }
1206 ref->weak--;
1207 }
1208 if (ref->strong == 0 && ref->weak == 0)
1209 binder_delete_ref(ref);
1210 return 0;
1211 }
1212
1213 static void binder_pop_transaction(struct binder_thread *target_thread,
1214 struct binder_transaction *t)
1215 {
1216 if (target_thread) {
1217 BUG_ON(target_thread->transaction_stack != t);
1218 BUG_ON(target_thread->transaction_stack->from != target_thread);
1219 target_thread->transaction_stack =
1220 target_thread->transaction_stack->from_parent;
1221 t->from = NULL;
1222 }
1223 t->need_reply = 0;
1224 if (t->buffer)
1225 t->buffer->transaction = NULL;
1226 kfree(t);
1227 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1228 }
1229
1230 static void binder_send_failed_reply(struct binder_transaction *t,
1231 uint32_t error_code)
1232 {
1233 struct binder_thread *target_thread;
1234 BUG_ON(t->flags & TF_ONE_WAY);
1235 while (1) {
1236 target_thread = t->from;
1237 if (target_thread) {
1238 if (target_thread->return_error != BR_OK &&
1239 target_thread->return_error2 == BR_OK) {
1240 target_thread->return_error2 =
1241 target_thread->return_error;
1242 target_thread->return_error = BR_OK;
1243 }
1244 if (target_thread->return_error == BR_OK) {
1245 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1246 "binder: send failed reply for "
1247 "transaction %d to %d:%d\n",
1248 t->debug_id, target_thread->proc->pid,
1249 target_thread->pid);
1250
1251 binder_pop_transaction(target_thread, t);
1252 target_thread->return_error = error_code;
1253 wake_up_interruptible(&target_thread->wait);
1254 } else {
1255 printk(KERN_ERR "binder: reply failed, target "
1256 "thread, %d:%d, has error code %d "
1257 "already\n", target_thread->proc->pid,
1258 target_thread->pid,
1259 target_thread->return_error);
1260 }
1261 return;
1262 } else {
1263 struct binder_transaction *next = t->from_parent;
1264
1265 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1266 "binder: send failed reply "
1267 "for transaction %d, target dead\n",
1268 t->debug_id);
1269
1270 binder_pop_transaction(target_thread, t);
1271 if (next == NULL) {
1272 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1273 "binder: reply failed,"
1274 " no target thread at root\n");
1275 return;
1276 }
1277 t = next;
1278 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1279 "binder: reply failed, no target "
1280 "thread -- retry %d\n", t->debug_id);
1281 }
1282 }
1283 }
1284
1285 static void binder_transaction_buffer_release(struct binder_proc *proc,
1286 struct binder_buffer *buffer,
1287 size_t *failed_at)
1288 {
1289 size_t *offp, *off_end;
1290 int debug_id = buffer->debug_id;
1291
1292 binder_debug(BINDER_DEBUG_TRANSACTION,
1293 "binder: %d buffer release %d, size %zd-%zd, failed at %p\n",
1294 proc->pid, buffer->debug_id,
1295 buffer->data_size, buffer->offsets_size, failed_at);
1296
1297 if (buffer->target_node)
1298 binder_dec_node(buffer->target_node, 1, 0);
1299
1300 offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
1301 if (failed_at)
1302 off_end = failed_at;
1303 else
1304 off_end = (void *)offp + buffer->offsets_size;
1305 for (; offp < off_end; offp++) {
1306 struct flat_binder_object *fp;
1307 if (*offp > buffer->data_size - sizeof(*fp) ||
1308 buffer->data_size < sizeof(*fp) ||
1309 !IS_ALIGNED(*offp, sizeof(void *))) {
1310 printk(KERN_ERR "binder: transaction release %d bad"
1311 "offset %zd, size %zd\n", debug_id,
1312 *offp, buffer->data_size);
1313 continue;
1314 }
1315 fp = (struct flat_binder_object *)(buffer->data + *offp);
1316 switch (fp->type) {
1317 case BINDER_TYPE_BINDER:
1318 case BINDER_TYPE_WEAK_BINDER: {
1319 struct binder_node *node = binder_get_node(proc, fp->binder);
1320 if (node == NULL) {
1321 printk(KERN_ERR "binder: transaction release %d"
1322 " bad node %p\n", debug_id, fp->binder);
1323 break;
1324 }
1325 binder_debug(BINDER_DEBUG_TRANSACTION,
1326 " node %d u%p\n",
1327 node->debug_id, node->ptr);
1328 binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1329 } break;
1330 case BINDER_TYPE_HANDLE:
1331 case BINDER_TYPE_WEAK_HANDLE: {
1332 struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1333 if (ref == NULL) {
1334 printk(KERN_ERR "binder: transaction release %d"
1335 " bad handle %ld\n", debug_id,
1336 fp->handle);
1337 break;
1338 }
1339 binder_debug(BINDER_DEBUG_TRANSACTION,
1340 " ref %d desc %d (node %d)\n",
1341 ref->debug_id, ref->desc, ref->node->debug_id);
1342 binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1343 } break;
1344
1345 case BINDER_TYPE_FD:
1346 binder_debug(BINDER_DEBUG_TRANSACTION,
1347 " fd %ld\n", fp->handle);
1348 if (failed_at)
1349 task_close_fd(proc, fp->handle);
1350 break;
1351
1352 default:
1353 printk(KERN_ERR "binder: transaction release %d bad "
1354 "object type %lx\n", debug_id, fp->type);
1355 break;
1356 }
1357 }
1358 }
1359
1360 static void binder_transaction(struct binder_proc *proc,
1361 struct binder_thread *thread,
1362 struct binder_transaction_data *tr, int reply)
1363 {
1364 struct binder_transaction *t;
1365 struct binder_work *tcomplete;
1366 size_t *offp, *off_end;
1367 struct binder_proc *target_proc;
1368 struct binder_thread *target_thread = NULL;
1369 struct binder_node *target_node = NULL;
1370 struct list_head *target_list;
1371 wait_queue_head_t *target_wait;
1372 struct binder_transaction *in_reply_to = NULL;
1373 struct binder_transaction_log_entry *e;
1374 uint32_t return_error;
1375
1376 e = binder_transaction_log_add(&binder_transaction_log);
1377 e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1378 e->from_proc = proc->pid;
1379 e->from_thread = thread->pid;
1380 e->target_handle = tr->target.handle;
1381 e->data_size = tr->data_size;
1382 e->offsets_size = tr->offsets_size;
1383
1384 if (reply) {
1385 in_reply_to = thread->transaction_stack;
1386 if (in_reply_to == NULL) {
1387 binder_user_error("binder: %d:%d got reply transaction "
1388 "with no transaction stack\n",
1389 proc->pid, thread->pid);
1390 return_error = BR_FAILED_REPLY;
1391 goto err_empty_call_stack;
1392 }
1393 binder_set_nice(in_reply_to->saved_priority);
1394 if (in_reply_to->to_thread != thread) {
1395 binder_user_error("binder: %d:%d got reply transaction "
1396 "with bad transaction stack,"
1397 " transaction %d has target %d:%d\n",
1398 proc->pid, thread->pid, in_reply_to->debug_id,
1399 in_reply_to->to_proc ?
1400 in_reply_to->to_proc->pid : 0,
1401 in_reply_to->to_thread ?
1402 in_reply_to->to_thread->pid : 0);
1403 return_error = BR_FAILED_REPLY;
1404 in_reply_to = NULL;
1405 goto err_bad_call_stack;
1406 }
1407 thread->transaction_stack = in_reply_to->to_parent;
1408 target_thread = in_reply_to->from;
1409 if (target_thread == NULL) {
1410 return_error = BR_DEAD_REPLY;
1411 goto err_dead_binder;
1412 }
1413 if (target_thread->transaction_stack != in_reply_to) {
1414 binder_user_error("binder: %d:%d got reply transaction "
1415 "with bad target transaction stack %d, "
1416 "expected %d\n",
1417 proc->pid, thread->pid,
1418 target_thread->transaction_stack ?
1419 target_thread->transaction_stack->debug_id : 0,
1420 in_reply_to->debug_id);
1421 return_error = BR_FAILED_REPLY;
1422 in_reply_to = NULL;
1423 target_thread = NULL;
1424 goto err_dead_binder;
1425 }
1426 target_proc = target_thread->proc;
1427 } else {
1428 if (tr->target.handle) {
1429 struct binder_ref *ref;
1430 ref = binder_get_ref(proc, tr->target.handle);
1431 if (ref == NULL) {
1432 binder_user_error("binder: %d:%d got "
1433 "transaction to invalid handle\n",
1434 proc->pid, thread->pid);
1435 return_error = BR_FAILED_REPLY;
1436 goto err_invalid_target_handle;
1437 }
1438 target_node = ref->node;
1439 } else {
1440 target_node = binder_context_mgr_node;
1441 if (target_node == NULL) {
1442 return_error = BR_DEAD_REPLY;
1443 goto err_no_context_mgr_node;
1444 }
1445 }
1446 e->to_node = target_node->debug_id;
1447 target_proc = target_node->proc;
1448 if (target_proc == NULL) {
1449 return_error = BR_DEAD_REPLY;
1450 goto err_dead_binder;
1451 }
1452 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1453 struct binder_transaction *tmp;
1454 tmp = thread->transaction_stack;
1455 if (tmp->to_thread != thread) {
1456 binder_user_error("binder: %d:%d got new "
1457 "transaction with bad transaction stack"
1458 ", transaction %d has target %d:%d\n",
1459 proc->pid, thread->pid, tmp->debug_id,
1460 tmp->to_proc ? tmp->to_proc->pid : 0,
1461 tmp->to_thread ?
1462 tmp->to_thread->pid : 0);
1463 return_error = BR_FAILED_REPLY;
1464 goto err_bad_call_stack;
1465 }
1466 while (tmp) {
1467 if (tmp->from && tmp->from->proc == target_proc)
1468 target_thread = tmp->from;
1469 tmp = tmp->from_parent;
1470 }
1471 }
1472 }
1473 if (target_thread) {
1474 e->to_thread = target_thread->pid;
1475 target_list = &target_thread->todo;
1476 target_wait = &target_thread->wait;
1477 } else {
1478 target_list = &target_proc->todo;
1479 target_wait = &target_proc->wait;
1480 }
1481 e->to_proc = target_proc->pid;
1482
1483 /* TODO: reuse incoming transaction for reply */
1484 t = kzalloc(sizeof(*t), GFP_KERNEL);
1485 if (t == NULL) {
1486 return_error = BR_FAILED_REPLY;
1487 goto err_alloc_t_failed;
1488 }
1489 binder_stats_created(BINDER_STAT_TRANSACTION);
1490
1491 tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1492 if (tcomplete == NULL) {
1493 return_error = BR_FAILED_REPLY;
1494 goto err_alloc_tcomplete_failed;
1495 }
1496 binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1497
1498 t->debug_id = ++binder_last_id;
1499 e->debug_id = t->debug_id;
1500
1501 if (reply)
1502 binder_debug(BINDER_DEBUG_TRANSACTION,
1503 "binder: %d:%d BC_REPLY %d -> %d:%d, "
1504 "data %p-%p size %zd-%zd\n",
1505 proc->pid, thread->pid, t->debug_id,
1506 target_proc->pid, target_thread->pid,
1507 tr->data.ptr.buffer, tr->data.ptr.offsets,
1508 tr->data_size, tr->offsets_size);
1509 else
1510 binder_debug(BINDER_DEBUG_TRANSACTION,
1511 "binder: %d:%d BC_TRANSACTION %d -> "
1512 "%d - node %d, data %p-%p size %zd-%zd\n",
1513 proc->pid, thread->pid, t->debug_id,
1514 target_proc->pid, target_node->debug_id,
1515 tr->data.ptr.buffer, tr->data.ptr.offsets,
1516 tr->data_size, tr->offsets_size);
1517
1518 if (!reply && !(tr->flags & TF_ONE_WAY))
1519 t->from = thread;
1520 else
1521 t->from = NULL;
1522 t->sender_euid = proc->tsk->cred->euid;
1523 t->to_proc = target_proc;
1524 t->to_thread = target_thread;
1525 t->code = tr->code;
1526 t->flags = tr->flags;
1527 t->priority = task_nice(current);
1528 t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1529 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1530 if (t->buffer == NULL) {
1531 return_error = BR_FAILED_REPLY;
1532 goto err_binder_alloc_buf_failed;
1533 }
1534 t->buffer->allow_user_free = 0;
1535 t->buffer->debug_id = t->debug_id;
1536 t->buffer->transaction = t;
1537 t->buffer->target_node = target_node;
1538 if (target_node)
1539 binder_inc_node(target_node, 1, 0, NULL);
1540
1541 offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
1542
1543 if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
1544 binder_user_error("binder: %d:%d got transaction with invalid "
1545 "data ptr\n", proc->pid, thread->pid);
1546 return_error = BR_FAILED_REPLY;
1547 goto err_copy_data_failed;
1548 }
1549 if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
1550 binder_user_error("binder: %d:%d got transaction with invalid "
1551 "offsets ptr\n", proc->pid, thread->pid);
1552 return_error = BR_FAILED_REPLY;
1553 goto err_copy_data_failed;
1554 }
1555 if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
1556 binder_user_error("binder: %d:%d got transaction with "
1557 "invalid offsets size, %zd\n",
1558 proc->pid, thread->pid, tr->offsets_size);
1559 return_error = BR_FAILED_REPLY;
1560 goto err_bad_offset;
1561 }
1562 off_end = (void *)offp + tr->offsets_size;
1563 for (; offp < off_end; offp++) {
1564 struct flat_binder_object *fp;
1565 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1566 t->buffer->data_size < sizeof(*fp) ||
1567 !IS_ALIGNED(*offp, sizeof(void *))) {
1568 binder_user_error("binder: %d:%d got transaction with "
1569 "invalid offset, %zd\n",
1570 proc->pid, thread->pid, *offp);
1571 return_error = BR_FAILED_REPLY;
1572 goto err_bad_offset;
1573 }
1574 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1575 switch (fp->type) {
1576 case BINDER_TYPE_BINDER:
1577 case BINDER_TYPE_WEAK_BINDER: {
1578 struct binder_ref *ref;
1579 struct binder_node *node = binder_get_node(proc, fp->binder);
1580 if (node == NULL) {
1581 node = binder_new_node(proc, fp->binder, fp->cookie);
1582 if (node == NULL) {
1583 return_error = BR_FAILED_REPLY;
1584 goto err_binder_new_node_failed;
1585 }
1586 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1587 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1588 }
1589 if (fp->cookie != node->cookie) {
1590 binder_user_error("binder: %d:%d sending u%p "
1591 "node %d, cookie mismatch %p != %p\n",
1592 proc->pid, thread->pid,
1593 fp->binder, node->debug_id,
1594 fp->cookie, node->cookie);
1595 goto err_binder_get_ref_for_node_failed;
1596 }
1597 ref = binder_get_ref_for_node(target_proc, node);
1598 if (ref == NULL) {
1599 return_error = BR_FAILED_REPLY;
1600 goto err_binder_get_ref_for_node_failed;
1601 }
1602 if (fp->type == BINDER_TYPE_BINDER)
1603 fp->type = BINDER_TYPE_HANDLE;
1604 else
1605 fp->type = BINDER_TYPE_WEAK_HANDLE;
1606 fp->handle = ref->desc;
1607 binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1608 &thread->todo);
1609
1610 binder_debug(BINDER_DEBUG_TRANSACTION,
1611 " node %d u%p -> ref %d desc %d\n",
1612 node->debug_id, node->ptr, ref->debug_id,
1613 ref->desc);
1614 } break;
1615 case BINDER_TYPE_HANDLE:
1616 case BINDER_TYPE_WEAK_HANDLE: {
1617 struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1618 if (ref == NULL) {
1619 binder_user_error("binder: %d:%d got "
1620 "transaction with invalid "
1621 "handle, %ld\n", proc->pid,
1622 thread->pid, fp->handle);
1623 return_error = BR_FAILED_REPLY;
1624 goto err_binder_get_ref_failed;
1625 }
1626 if (ref->node->proc == target_proc) {
1627 if (fp->type == BINDER_TYPE_HANDLE)
1628 fp->type = BINDER_TYPE_BINDER;
1629 else
1630 fp->type = BINDER_TYPE_WEAK_BINDER;
1631 fp->binder = ref->node->ptr;
1632 fp->cookie = ref->node->cookie;
1633 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1634 binder_debug(BINDER_DEBUG_TRANSACTION,
1635 " ref %d desc %d -> node %d u%p\n",
1636 ref->debug_id, ref->desc, ref->node->debug_id,
1637 ref->node->ptr);
1638 } else {
1639 struct binder_ref *new_ref;
1640 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1641 if (new_ref == NULL) {
1642 return_error = BR_FAILED_REPLY;
1643 goto err_binder_get_ref_for_node_failed;
1644 }
1645 fp->handle = new_ref->desc;
1646 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1647 binder_debug(BINDER_DEBUG_TRANSACTION,
1648 " ref %d desc %d -> ref %d desc %d (node %d)\n",
1649 ref->debug_id, ref->desc, new_ref->debug_id,
1650 new_ref->desc, ref->node->debug_id);
1651 }
1652 } break;
1653
1654 case BINDER_TYPE_FD: {
1655 int target_fd;
1656 struct file *file;
1657
1658 if (reply) {
1659 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1660 binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds\n",
1661 proc->pid, thread->pid, fp->handle);
1662 return_error = BR_FAILED_REPLY;
1663 goto err_fd_not_allowed;
1664 }
1665 } else if (!target_node->accept_fds) {
1666 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds\n",
1667 proc->pid, thread->pid, fp->handle);
1668 return_error = BR_FAILED_REPLY;
1669 goto err_fd_not_allowed;
1670 }
1671
1672 file = fget(fp->handle);
1673 if (file == NULL) {
1674 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld\n",
1675 proc->pid, thread->pid, fp->handle);
1676 return_error = BR_FAILED_REPLY;
1677 goto err_fget_failed;
1678 }
1679 target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1680 if (target_fd < 0) {
1681 fput(file);
1682 return_error = BR_FAILED_REPLY;
1683 goto err_get_unused_fd_failed;
1684 }
1685 task_fd_install(target_proc, target_fd, file);
1686 binder_debug(BINDER_DEBUG_TRANSACTION,
1687 " fd %ld -> %d\n", fp->handle, target_fd);
1688 /* TODO: fput? */
1689 fp->handle = target_fd;
1690 } break;
1691
1692 default:
1693 binder_user_error("binder: %d:%d got transactio"
1694 "n with invalid object type, %lx\n",
1695 proc->pid, thread->pid, fp->type);
1696 return_error = BR_FAILED_REPLY;
1697 goto err_bad_object_type;
1698 }
1699 }
1700 if (reply) {
1701 BUG_ON(t->buffer->async_transaction != 0);
1702 binder_pop_transaction(target_thread, in_reply_to);
1703 } else if (!(t->flags & TF_ONE_WAY)) {
1704 BUG_ON(t->buffer->async_transaction != 0);
1705 t->need_reply = 1;
1706 t->from_parent = thread->transaction_stack;
1707 thread->transaction_stack = t;
1708 } else {
1709 BUG_ON(target_node == NULL);
1710 BUG_ON(t->buffer->async_transaction != 1);
1711 if (target_node->has_async_transaction) {
1712 target_list = &target_node->async_todo;
1713 target_wait = NULL;
1714 } else
1715 target_node->has_async_transaction = 1;
1716 }
1717 t->work.type = BINDER_WORK_TRANSACTION;
1718 list_add_tail(&t->work.entry, target_list);
1719 tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1720 list_add_tail(&tcomplete->entry, &thread->todo);
1721 if (target_wait)
1722 wake_up_interruptible(target_wait);
1723 return;
1724
1725 err_get_unused_fd_failed:
1726 err_fget_failed:
1727 err_fd_not_allowed:
1728 err_binder_get_ref_for_node_failed:
1729 err_binder_get_ref_failed:
1730 err_binder_new_node_failed:
1731 err_bad_object_type:
1732 err_bad_offset:
1733 err_copy_data_failed:
1734 binder_transaction_buffer_release(target_proc, t->buffer, offp);
1735 t->buffer->transaction = NULL;
1736 binder_free_buf(target_proc, t->buffer);
1737 err_binder_alloc_buf_failed:
1738 kfree(tcomplete);
1739 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1740 err_alloc_tcomplete_failed:
1741 kfree(t);
1742 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1743 err_alloc_t_failed:
1744 err_bad_call_stack:
1745 err_empty_call_stack:
1746 err_dead_binder:
1747 err_invalid_target_handle:
1748 err_no_context_mgr_node:
1749 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1750 "binder: %d:%d transaction failed %d, size %zd-%zd\n",
1751 proc->pid, thread->pid, return_error,
1752 tr->data_size, tr->offsets_size);
1753
1754 {
1755 struct binder_transaction_log_entry *fe;
1756 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1757 *fe = *e;
1758 }
1759
1760 BUG_ON(thread->return_error != BR_OK);
1761 if (in_reply_to) {
1762 thread->return_error = BR_TRANSACTION_COMPLETE;
1763 binder_send_failed_reply(in_reply_to, return_error);
1764 } else
1765 thread->return_error = return_error;
1766 }
1767
1768 int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
1769 void __user *buffer, int size, signed long *consumed)
1770 {
1771 uint32_t cmd;
1772 void __user *ptr = buffer + *consumed;
1773 void __user *end = buffer + size;
1774
1775 while (ptr < end && thread->return_error == BR_OK) {
1776 if (get_user(cmd, (uint32_t __user *)ptr))
1777 return -EFAULT;
1778 ptr += sizeof(uint32_t);
1779 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1780 binder_stats.bc[_IOC_NR(cmd)]++;
1781 proc->stats.bc[_IOC_NR(cmd)]++;
1782 thread->stats.bc[_IOC_NR(cmd)]++;
1783 }
1784 switch (cmd) {
1785 case BC_INCREFS:
1786 case BC_ACQUIRE:
1787 case BC_RELEASE:
1788 case BC_DECREFS: {
1789 uint32_t target;
1790 struct binder_ref *ref;
1791 const char *debug_string;
1792
1793 if (get_user(target, (uint32_t __user *)ptr))
1794 return -EFAULT;
1795 ptr += sizeof(uint32_t);
1796 if (target == 0 && binder_context_mgr_node &&
1797 (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1798 ref = binder_get_ref_for_node(proc,
1799 binder_context_mgr_node);
1800 if (ref->desc != target) {
1801 binder_user_error("binder: %d:"
1802 "%d tried to acquire "
1803 "reference to desc 0, "
1804 "got %d instead\n",
1805 proc->pid, thread->pid,
1806 ref->desc);
1807 }
1808 } else
1809 ref = binder_get_ref(proc, target);
1810 if (ref == NULL) {
1811 binder_user_error("binder: %d:%d refcou"
1812 "nt change on invalid ref %d\n",
1813 proc->pid, thread->pid, target);
1814 break;
1815 }
1816 switch (cmd) {
1817 case BC_INCREFS:
1818 debug_string = "IncRefs";
1819 binder_inc_ref(ref, 0, NULL);
1820 break;
1821 case BC_ACQUIRE:
1822 debug_string = "Acquire";
1823 binder_inc_ref(ref, 1, NULL);
1824 break;
1825 case BC_RELEASE:
1826 debug_string = "Release";
1827 binder_dec_ref(ref, 1);
1828 break;
1829 case BC_DECREFS:
1830 default:
1831 debug_string = "DecRefs";
1832 binder_dec_ref(ref, 0);
1833 break;
1834 }
1835 binder_debug(BINDER_DEBUG_USER_REFS,
1836 "binder: %d:%d %s ref %d desc %d s %d w %d for node %d\n",
1837 proc->pid, thread->pid, debug_string, ref->debug_id,
1838 ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1839 break;
1840 }
1841 case BC_INCREFS_DONE:
1842 case BC_ACQUIRE_DONE: {
1843 void __user *node_ptr;
1844 void *cookie;
1845 struct binder_node *node;
1846
1847 if (get_user(node_ptr, (void * __user *)ptr))
1848 return -EFAULT;
1849 ptr += sizeof(void *);
1850 if (get_user(cookie, (void * __user *)ptr))
1851 return -EFAULT;
1852 ptr += sizeof(void *);
1853 node = binder_get_node(proc, node_ptr);
1854 if (node == NULL) {
1855 binder_user_error("binder: %d:%d "
1856 "%s u%p no match\n",
1857 proc->pid, thread->pid,
1858 cmd == BC_INCREFS_DONE ?
1859 "BC_INCREFS_DONE" :
1860 "BC_ACQUIRE_DONE",
1861 node_ptr);
1862 break;
1863 }
1864 if (cookie != node->cookie) {
1865 binder_user_error("binder: %d:%d %s u%p node %d"
1866 " cookie mismatch %p != %p\n",
1867 proc->pid, thread->pid,
1868 cmd == BC_INCREFS_DONE ?
1869 "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1870 node_ptr, node->debug_id,
1871 cookie, node->cookie);
1872 break;
1873 }
1874 if (cmd == BC_ACQUIRE_DONE) {
1875 if (node->pending_strong_ref == 0) {
1876 binder_user_error("binder: %d:%d "
1877 "BC_ACQUIRE_DONE node %d has "
1878 "no pending acquire request\n",
1879 proc->pid, thread->pid,
1880 node->debug_id);
1881 break;
1882 }
1883 node->pending_strong_ref = 0;
1884 } else {
1885 if (node->pending_weak_ref == 0) {
1886 binder_user_error("binder: %d:%d "
1887 "BC_INCREFS_DONE node %d has "
1888 "no pending increfs request\n",
1889 proc->pid, thread->pid,
1890 node->debug_id);
1891 break;
1892 }
1893 node->pending_weak_ref = 0;
1894 }
1895 binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1896 binder_debug(BINDER_DEBUG_USER_REFS,
1897 "binder: %d:%d %s node %d ls %d lw %d\n",
1898 proc->pid, thread->pid,
1899 cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1900 node->debug_id, node->local_strong_refs, node->local_weak_refs);
1901 break;
1902 }
1903 case BC_ATTEMPT_ACQUIRE:
1904 printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported\n");
1905 return -EINVAL;
1906 case BC_ACQUIRE_RESULT:
1907 printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported\n");
1908 return -EINVAL;
1909
1910 case BC_FREE_BUFFER: {
1911 void __user *data_ptr;
1912 struct binder_buffer *buffer;
1913
1914 if (get_user(data_ptr, (void * __user *)ptr))
1915 return -EFAULT;
1916 ptr += sizeof(void *);
1917
1918 buffer = binder_buffer_lookup(proc, data_ptr);
1919 if (buffer == NULL) {
1920 binder_user_error("binder: %d:%d "
1921 "BC_FREE_BUFFER u%p no match\n",
1922 proc->pid, thread->pid, data_ptr);
1923 break;
1924 }
1925 if (!buffer->allow_user_free) {
1926 binder_user_error("binder: %d:%d "
1927 "BC_FREE_BUFFER u%p matched "
1928 "unreturned buffer\n",
1929 proc->pid, thread->pid, data_ptr);
1930 break;
1931 }
1932 binder_debug(BINDER_DEBUG_FREE_BUFFER,
1933 "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction\n",
1934 proc->pid, thread->pid, data_ptr, buffer->debug_id,
1935 buffer->transaction ? "active" : "finished");
1936
1937 if (buffer->transaction) {
1938 buffer->transaction->buffer = NULL;
1939 buffer->transaction = NULL;
1940 }
1941 if (buffer->async_transaction && buffer->target_node) {
1942 BUG_ON(!buffer->target_node->has_async_transaction);
1943 if (list_empty(&buffer->target_node->async_todo))
1944 buffer->target_node->has_async_transaction = 0;
1945 else
1946 list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1947 }
1948 binder_transaction_buffer_release(proc, buffer, NULL);
1949 binder_free_buf(proc, buffer);
1950 break;
1951 }
1952
1953 case BC_TRANSACTION:
1954 case BC_REPLY: {
1955 struct binder_transaction_data tr;
1956
1957 if (copy_from_user(&tr, ptr, sizeof(tr)))
1958 return -EFAULT;
1959 ptr += sizeof(tr);
1960 binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1961 break;
1962 }
1963
1964 case BC_REGISTER_LOOPER:
1965 binder_debug(BINDER_DEBUG_THREADS,
1966 "binder: %d:%d BC_REGISTER_LOOPER\n",
1967 proc->pid, thread->pid);
1968 if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1969 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1970 binder_user_error("binder: %d:%d ERROR:"
1971 " BC_REGISTER_LOOPER called "
1972 "after BC_ENTER_LOOPER\n",
1973 proc->pid, thread->pid);
1974 } else if (proc->requested_threads == 0) {
1975 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1976 binder_user_error("binder: %d:%d ERROR:"
1977 " BC_REGISTER_LOOPER called "
1978 "without request\n",
1979 proc->pid, thread->pid);
1980 } else {
1981 proc->requested_threads--;
1982 proc->requested_threads_started++;
1983 }
1984 thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1985 break;
1986 case BC_ENTER_LOOPER:
1987 binder_debug(BINDER_DEBUG_THREADS,
1988 "binder: %d:%d BC_ENTER_LOOPER\n",
1989 proc->pid, thread->pid);
1990 if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1991 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1992 binder_user_error("binder: %d:%d ERROR:"
1993 " BC_ENTER_LOOPER called after "
1994 "BC_REGISTER_LOOPER\n",
1995 proc->pid, thread->pid);
1996 }
1997 thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1998 break;
1999 case BC_EXIT_LOOPER:
2000 binder_debug(BINDER_DEBUG_THREADS,
2001 "binder: %d:%d BC_EXIT_LOOPER\n",
2002 proc->pid, thread->pid);
2003 thread->looper |= BINDER_LOOPER_STATE_EXITED;
2004 break;
2005
2006 case BC_REQUEST_DEATH_NOTIFICATION:
2007 case BC_CLEAR_DEATH_NOTIFICATION: {
2008 uint32_t target;
2009 void __user *cookie;
2010 struct binder_ref *ref;
2011 struct binder_ref_death *death;
2012
2013 if (get_user(target, (uint32_t __user *)ptr))
2014 return -EFAULT;
2015 ptr += sizeof(uint32_t);
2016 if (get_user(cookie, (void __user * __user *)ptr))
2017 return -EFAULT;
2018 ptr += sizeof(void *);
2019 ref = binder_get_ref(proc, target);
2020 if (ref == NULL) {
2021 binder_user_error("binder: %d:%d %s "
2022 "invalid ref %d\n",
2023 proc->pid, thread->pid,
2024 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2025 "BC_REQUEST_DEATH_NOTIFICATION" :
2026 "BC_CLEAR_DEATH_NOTIFICATION",
2027 target);
2028 break;
2029 }
2030
2031 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2032 "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d\n",
2033 proc->pid, thread->pid,
2034 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2035 "BC_REQUEST_DEATH_NOTIFICATION" :
2036 "BC_CLEAR_DEATH_NOTIFICATION",
2037 cookie, ref->debug_id, ref->desc,
2038 ref->strong, ref->weak, ref->node->debug_id);
2039
2040 if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2041 if (ref->death) {
2042 binder_user_error("binder: %d:%"
2043 "d BC_REQUEST_DEATH_NOTI"
2044 "FICATION death notific"
2045 "ation already set\n",
2046 proc->pid, thread->pid);
2047 break;
2048 }
2049 death = kzalloc(sizeof(*death), GFP_KERNEL);
2050 if (death == NULL) {
2051 thread->return_error = BR_ERROR;
2052 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2053 "binder: %d:%d "
2054 "BC_REQUEST_DEATH_NOTIFICATION failed\n",
2055 proc->pid, thread->pid);
2056 break;
2057 }
2058 binder_stats_created(BINDER_STAT_DEATH);
2059 INIT_LIST_HEAD(&death->work.entry);
2060 death->cookie = cookie;
2061 ref->death = death;
2062 if (ref->node->proc == NULL) {
2063 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2064 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2065 list_add_tail(&ref->death->work.entry, &thread->todo);
2066 } else {
2067 list_add_tail(&ref->death->work.entry, &proc->todo);
2068 wake_up_interruptible(&proc->wait);
2069 }
2070 }
2071 } else {
2072 if (ref->death == NULL) {
2073 binder_user_error("binder: %d:%"
2074 "d BC_CLEAR_DEATH_NOTIFI"
2075 "CATION death notificat"
2076 "ion not active\n",
2077 proc->pid, thread->pid);
2078 break;
2079 }
2080 death = ref->death;
2081 if (death->cookie != cookie) {
2082 binder_user_error("binder: %d:%"
2083 "d BC_CLEAR_DEATH_NOTIFI"
2084 "CATION death notificat"
2085 "ion cookie mismatch "
2086 "%p != %p\n",
2087 proc->pid, thread->pid,
2088 death->cookie, cookie);
2089 break;
2090 }
2091 ref->death = NULL;
2092 if (list_empty(&death->work.entry)) {
2093 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2094 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2095 list_add_tail(&death->work.entry, &thread->todo);
2096 } else {
2097 list_add_tail(&death->work.entry, &proc->todo);
2098 wake_up_interruptible(&proc->wait);
2099 }
2100 } else {
2101 BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2102 death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2103 }
2104 }
2105 } break;
2106 case BC_DEAD_BINDER_DONE: {
2107 struct binder_work *w;
2108 void __user *cookie;
2109 struct binder_ref_death *death = NULL;
2110 if (get_user(cookie, (void __user * __user *)ptr))
2111 return -EFAULT;
2112
2113 ptr += sizeof(void *);
2114 list_for_each_entry(w, &proc->delivered_death, entry) {
2115 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2116 if (tmp_death->cookie == cookie) {
2117 death = tmp_death;
2118 break;
2119 }
2120 }
2121 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2122 "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p\n",
2123 proc->pid, thread->pid, cookie, death);
2124 if (death == NULL) {
2125 binder_user_error("binder: %d:%d BC_DEAD"
2126 "_BINDER_DONE %p not found\n",
2127 proc->pid, thread->pid, cookie);
2128 break;
2129 }
2130
2131 list_del_init(&death->work.entry);
2132 if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2133 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2134 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2135 list_add_tail(&death->work.entry, &thread->todo);
2136 } else {
2137 list_add_tail(&death->work.entry, &proc->todo);
2138 wake_up_interruptible(&proc->wait);
2139 }
2140 }
2141 } break;
2142
2143 default:
2144 printk(KERN_ERR "binder: %d:%d unknown command %d\n",
2145 proc->pid, thread->pid, cmd);
2146 return -EINVAL;
2147 }
2148 *consumed = ptr - buffer;
2149 }
2150 return 0;
2151 }
2152
2153 void binder_stat_br(struct binder_proc *proc, struct binder_thread *thread,
2154 uint32_t cmd)
2155 {
2156 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2157 binder_stats.br[_IOC_NR(cmd)]++;
2158 proc->stats.br[_IOC_NR(cmd)]++;
2159 thread->stats.br[_IOC_NR(cmd)]++;
2160 }
2161 }
2162
2163 static int binder_has_proc_work(struct binder_proc *proc,
2164 struct binder_thread *thread)
2165 {
2166 return !list_empty(&proc->todo) ||
2167 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2168 }
2169
2170 static int binder_has_thread_work(struct binder_thread *thread)
2171 {
2172 return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2173 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2174 }
2175
2176 static int binder_thread_read(struct binder_proc *proc,
2177 struct binder_thread *thread,
2178 void __user *buffer, int size,
2179 signed long *consumed, int non_block)
2180 {
2181 void __user *ptr = buffer + *consumed;
2182 void __user *end = buffer + size;
2183
2184 int ret = 0;
2185 int wait_for_proc_work;
2186
2187 if (*consumed == 0) {
2188 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2189 return -EFAULT;
2190 ptr += sizeof(uint32_t);
2191 }
2192
2193 retry:
2194 wait_for_proc_work = thread->transaction_stack == NULL &&
2195 list_empty(&thread->todo);
2196
2197 if (thread->return_error != BR_OK && ptr < end) {
2198 if (thread->return_error2 != BR_OK) {
2199 if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2200 return -EFAULT;
2201 ptr += sizeof(uint32_t);
2202 if (ptr == end)
2203 goto done;
2204 thread->return_error2 = BR_OK;
2205 }
2206 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2207 return -EFAULT;
2208 ptr += sizeof(uint32_t);
2209 thread->return_error = BR_OK;
2210 goto done;
2211 }
2212
2213
2214 thread->looper |= BINDER_LOOPER_STATE_WAITING;
2215 if (wait_for_proc_work)
2216 proc->ready_threads++;
2217 mutex_unlock(&binder_lock);
2218 if (wait_for_proc_work) {
2219 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2220 BINDER_LOOPER_STATE_ENTERED))) {
2221 binder_user_error("binder: %d:%d ERROR: Thread waiting "
2222 "for process work before calling BC_REGISTER_"
2223 "LOOPER or BC_ENTER_LOOPER (state %x)\n",
2224 proc->pid, thread->pid, thread->looper);
2225 wait_event_interruptible(binder_user_error_wait,
2226 binder_stop_on_user_error < 2);
2227 }
2228 binder_set_nice(proc->default_priority);
2229 if (non_block) {
2230 if (!binder_has_proc_work(proc, thread))
2231 ret = -EAGAIN;
2232 } else
2233 ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2234 } else {
2235 if (non_block) {
2236 if (!binder_has_thread_work(thread))
2237 ret = -EAGAIN;
2238 } else
2239 ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
2240 }
2241 mutex_lock(&binder_lock);
2242 if (wait_for_proc_work)
2243 proc->ready_threads--;
2244 thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2245
2246 if (ret)
2247 return ret;
2248
2249 while (1) {
2250 uint32_t cmd;
2251 struct binder_transaction_data tr;
2252 struct binder_work *w;
2253 struct binder_transaction *t = NULL;
2254
2255 if (!list_empty(&thread->todo))
2256 w = list_first_entry(&thread->todo, struct binder_work, entry);
2257 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2258 w = list_first_entry(&proc->todo, struct binder_work, entry);
2259 else {
2260 if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2261 goto retry;
2262 break;
2263 }
2264
2265 if (end - ptr < sizeof(tr) + 4)
2266 break;
2267
2268 switch (w->type) {
2269 case BINDER_WORK_TRANSACTION: {
2270 t = container_of(w, struct binder_transaction, work);
2271 } break;
2272 case BINDER_WORK_TRANSACTION_COMPLETE: {
2273 cmd = BR_TRANSACTION_COMPLETE;
2274 if (put_user(cmd, (uint32_t __user *)ptr))
2275 return -EFAULT;
2276 ptr += sizeof(uint32_t);
2277
2278 binder_stat_br(proc, thread, cmd);
2279 binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2280 "binder: %d:%d BR_TRANSACTION_COMPLETE\n",
2281 proc->pid, thread->pid);
2282
2283 list_del(&w->entry);
2284 kfree(w);
2285 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2286 } break;
2287 case BINDER_WORK_NODE: {
2288 struct binder_node *node = container_of(w, struct binder_node, work);
2289 uint32_t cmd = BR_NOOP;
2290 const char *cmd_name;
2291 int strong = node->internal_strong_refs || node->local_strong_refs;
2292 int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2293 if (weak && !node->has_weak_ref) {
2294 cmd = BR_INCREFS;
2295 cmd_name = "BR_INCREFS";
2296 node->has_weak_ref = 1;
2297 node->pending_weak_ref = 1;
2298 node->local_weak_refs++;
2299 } else if (strong && !node->has_strong_ref) {
2300 cmd = BR_ACQUIRE;
2301 cmd_name = "BR_ACQUIRE";
2302 node->has_strong_ref = 1;
2303 node->pending_strong_ref = 1;
2304 node->local_strong_refs++;
2305 } else if (!strong && node->has_strong_ref) {
2306 cmd = BR_RELEASE;
2307 cmd_name = "BR_RELEASE";
2308 node->has_strong_ref = 0;
2309 } else if (!weak && node->has_weak_ref) {
2310 cmd = BR_DECREFS;
2311 cmd_name = "BR_DECREFS";
2312 node->has_weak_ref = 0;
2313 }
2314 if (cmd != BR_NOOP) {
2315 if (put_user(cmd, (uint32_t __user *)ptr))
2316 return -EFAULT;
2317 ptr += sizeof(uint32_t);
2318 if (put_user(node->ptr, (void * __user *)ptr))
2319 return -EFAULT;
2320 ptr += sizeof(void *);
2321 if (put_user(node->cookie, (void * __user *)ptr))
2322 return -EFAULT;
2323 ptr += sizeof(void *);
2324
2325 binder_stat_br(proc, thread, cmd);
2326 binder_debug(BINDER_DEBUG_USER_REFS,
2327 "binder: %d:%d %s %d u%p c%p\n",
2328 proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
2329 } else {
2330 list_del_init(&w->entry);
2331 if (!weak && !strong) {
2332 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2333 "binder: %d:%d node %d u%p c%p deleted\n",
2334 proc->pid, thread->pid, node->debug_id,
2335 node->ptr, node->cookie);
2336 rb_erase(&node->rb_node, &proc->nodes);
2337 kfree(node);
2338 binder_stats_deleted(BINDER_STAT_NODE);
2339 } else {
2340 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2341 "binder: %d:%d node %d u%p c%p state unchanged\n",
2342 proc->pid, thread->pid, node->debug_id, node->ptr,
2343 node->cookie);
2344 }
2345 }
2346 } break;
2347 case BINDER_WORK_DEAD_BINDER:
2348 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2349 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2350 struct binder_ref_death *death;
2351 uint32_t cmd;
2352
2353 death = container_of(w, struct binder_ref_death, work);
2354 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2355 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2356 else
2357 cmd = BR_DEAD_BINDER;
2358 if (put_user(cmd, (uint32_t __user *)ptr))
2359 return -EFAULT;
2360 ptr += sizeof(uint32_t);
2361 if (put_user(death->cookie, (void * __user *)ptr))
2362 return -EFAULT;
2363 ptr += sizeof(void *);
2364 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2365 "binder: %d:%d %s %p\n",
2366 proc->pid, thread->pid,
2367 cmd == BR_DEAD_BINDER ?
2368 "BR_DEAD_BINDER" :
2369 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2370 death->cookie);
2371
2372 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2373 list_del(&w->entry);
2374 kfree(death);
2375 binder_stats_deleted(BINDER_STAT_DEATH);
2376 } else
2377 list_move(&w->entry, &proc->delivered_death);
2378 if (cmd == BR_DEAD_BINDER)
2379 goto done; /* DEAD_BINDER notifications can cause transactions */
2380 } break;
2381 }
2382
2383 if (!t)
2384 continue;
2385
2386 BUG_ON(t->buffer == NULL);
2387 if (t->buffer->target_node) {
2388 struct binder_node *target_node = t->buffer->target_node;
2389 tr.target.ptr = target_node->ptr;
2390 tr.cookie = target_node->cookie;
2391 t->saved_priority = task_nice(current);
2392 if (t->priority < target_node->min_priority &&
2393 !(t->flags & TF_ONE_WAY))
2394 binder_set_nice(t->priority);
2395 else if (!(t->flags & TF_ONE_WAY) ||
2396 t->saved_priority > target_node->min_priority)
2397 binder_set_nice(target_node->min_priority);
2398 cmd = BR_TRANSACTION;
2399 } else {
2400 tr.target.ptr = NULL;
2401 tr.cookie = NULL;
2402 cmd = BR_REPLY;
2403 }
2404 tr.code = t->code;
2405 tr.flags = t->flags;
2406 tr.sender_euid = t->sender_euid;
2407
2408 if (t->from) {
2409 struct task_struct *sender = t->from->proc->tsk;
2410 tr.sender_pid = task_tgid_nr_ns(sender,
2411 current->nsproxy->pid_ns);
2412 } else {
2413 tr.sender_pid = 0;
2414 }
2415
2416 tr.data_size = t->buffer->data_size;
2417 tr.offsets_size = t->buffer->offsets_size;
2418 tr.data.ptr.buffer = (void *)t->buffer->data +
2419 proc->user_buffer_offset;
2420 tr.data.ptr.offsets = tr.data.ptr.buffer +
2421 ALIGN(t->buffer->data_size,
2422 sizeof(void *));
2423
2424 if (put_user(cmd, (uint32_t __user *)ptr))
2425 return -EFAULT;
2426 ptr += sizeof(uint32_t);
2427 if (copy_to_user(ptr, &tr, sizeof(tr)))
2428 return -EFAULT;
2429 ptr += sizeof(tr);
2430
2431 binder_stat_br(proc, thread, cmd);
2432 binder_debug(BINDER_DEBUG_TRANSACTION,
2433 "binder: %d:%d %s %d %d:%d, cmd %d"
2434 "size %zd-%zd ptr %p-%p\n",
2435 proc->pid, thread->pid,
2436 (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2437 "BR_REPLY",
2438 t->debug_id, t->from ? t->from->proc->pid : 0,
2439 t->from ? t->from->pid : 0, cmd,
2440 t->buffer->data_size, t->buffer->offsets_size,
2441 tr.data.ptr.buffer, tr.data.ptr.offsets);
2442
2443 list_del(&t->work.entry);
2444 t->buffer->allow_user_free = 1;
2445 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2446 t->to_parent = thread->transaction_stack;
2447 t->to_thread = thread;
2448 thread->transaction_stack = t;
2449 } else {
2450 t->buffer->transaction = NULL;
2451 kfree(t);
2452 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2453 }
2454 break;
2455 }
2456
2457 done:
2458
2459 *consumed = ptr - buffer;
2460 if (proc->requested_threads + proc->ready_threads == 0 &&
2461 proc->requested_threads_started < proc->max_threads &&
2462 (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2463 BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2464 /*spawn a new thread if we leave this out */) {
2465 proc->requested_threads++;
2466 binder_debug(BINDER_DEBUG_THREADS,
2467 "binder: %d:%d BR_SPAWN_LOOPER\n",
2468 proc->pid, thread->pid);
2469 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2470 return -EFAULT;
2471 }
2472 return 0;
2473 }
2474
2475 static void binder_release_work(struct list_head *list)
2476 {
2477 struct binder_work *w;
2478 while (!list_empty(list)) {
2479 w = list_first_entry(list, struct binder_work, entry);
2480 list_del_init(&w->entry);
2481 switch (w->type) {
2482 case BINDER_WORK_TRANSACTION: {
2483 struct binder_transaction *t;
2484
2485 t = container_of(w, struct binder_transaction, work);
2486 if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
2487 binder_send_failed_reply(t, BR_DEAD_REPLY);
2488 } break;
2489 case BINDER_WORK_TRANSACTION_COMPLETE: {
2490 kfree(w);
2491 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2492 } break;
2493 default:
2494 break;
2495 }
2496 }
2497
2498 }
2499
2500 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2501 {
2502 struct binder_thread *thread = NULL;
2503 struct rb_node *parent = NULL;
2504 struct rb_node **p = &proc->threads.rb_node;
2505
2506 while (*p) {
2507 parent = *p;
2508 thread = rb_entry(parent, struct binder_thread, rb_node);
2509
2510 if (current->pid < thread->pid)
2511 p = &(*p)->rb_left;
2512 else if (current->pid > thread->pid)
2513 p = &(*p)->rb_right;
2514 else
2515 break;
2516 }
2517 if (*p == NULL) {
2518 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2519 if (thread == NULL)
2520 return NULL;
2521 binder_stats_created(BINDER_STAT_THREAD);
2522 thread->proc = proc;
2523 thread->pid = current->pid;
2524 init_waitqueue_head(&thread->wait);
2525 INIT_LIST_HEAD(&thread->todo);
2526 rb_link_node(&thread->rb_node, parent, p);
2527 rb_insert_color(&thread->rb_node, &proc->threads);
2528 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2529 thread->return_error = BR_OK;
2530 thread->return_error2 = BR_OK;
2531 }
2532 return thread;
2533 }
2534
2535 static int binder_free_thread(struct binder_proc *proc,
2536 struct binder_thread *thread)
2537 {
2538 struct binder_transaction *t;
2539 struct binder_transaction *send_reply = NULL;
2540 int active_transactions = 0;
2541
2542 rb_erase(&thread->rb_node, &proc->threads);
2543 t = thread->transaction_stack;
2544 if (t && t->to_thread == thread)
2545 send_reply = t;
2546 while (t) {
2547 active_transactions++;
2548 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2549 "binder: release %d:%d transaction %d "
2550 "%s, still active\n", proc->pid, thread->pid,
2551 t->debug_id,
2552 (t->to_thread == thread) ? "in" : "out");
2553
2554 if (t->to_thread == thread) {
2555 t->to_proc = NULL;
2556 t->to_thread = NULL;
2557 if (t->buffer) {
2558 t->buffer->transaction = NULL;
2559 t->buffer = NULL;
2560 }
2561 t = t->to_parent;
2562 } else if (t->from == thread) {
2563 t->from = NULL;
2564 t = t->from_parent;
2565 } else
2566 BUG();
2567 }
2568 if (send_reply)
2569 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2570 binder_release_work(&thread->todo);
2571 kfree(thread);
2572 binder_stats_deleted(BINDER_STAT_THREAD);
2573 return active_transactions;
2574 }
2575
2576 static unsigned int binder_poll(struct file *filp,
2577 struct poll_table_struct *wait)
2578 {
2579 struct binder_proc *proc = filp->private_data;
2580 struct binder_thread *thread = NULL;
2581 int wait_for_proc_work;
2582
2583 mutex_lock(&binder_lock);
2584 thread = binder_get_thread(proc);
2585
2586 wait_for_proc_work = thread->transaction_stack == NULL &&
2587 list_empty(&thread->todo) && thread->return_error == BR_OK;
2588 mutex_unlock(&binder_lock);
2589
2590 if (wait_for_proc_work) {
2591 if (binder_has_proc_work(proc, thread))
2592 return POLLIN;
2593 poll_wait(filp, &proc->wait, wait);
2594 if (binder_has_proc_work(proc, thread))
2595 return POLLIN;
2596 } else {
2597 if (binder_has_thread_work(thread))
2598 return POLLIN;
2599 poll_wait(filp, &thread->wait, wait);
2600 if (binder_has_thread_work(thread))
2601 return POLLIN;
2602 }
2603 return 0;
2604 }
2605
2606 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2607 {
2608 int ret;
2609 struct binder_proc *proc = filp->private_data;
2610 struct binder_thread *thread;
2611 unsigned int size = _IOC_SIZE(cmd);
2612 void __user *ubuf = (void __user *)arg;
2613
2614 /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
2615
2616 ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2617 if (ret)
2618 return ret;
2619
2620 mutex_lock(&binder_lock);
2621 thread = binder_get_thread(proc);
2622 if (thread == NULL) {
2623 ret = -ENOMEM;
2624 goto err;
2625 }
2626
2627 switch (cmd) {
2628 case BINDER_WRITE_READ: {
2629 struct binder_write_read bwr;
2630 if (size != sizeof(struct binder_write_read)) {
2631 ret = -EINVAL;
2632 goto err;
2633 }
2634 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2635 ret = -EFAULT;
2636 goto err;
2637 }
2638 binder_debug(BINDER_DEBUG_READ_WRITE,
2639 "binder: %d:%d write %ld at %08lx, read %ld at %08lx\n",
2640 proc->pid, thread->pid, bwr.write_size, bwr.write_buffer,
2641 bwr.read_size, bwr.read_buffer);
2642
2643 if (bwr.write_size > 0) {
2644 ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
2645 if (ret < 0) {
2646 bwr.read_consumed = 0;
2647 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2648 ret = -EFAULT;
2649 goto err;
2650 }
2651 }
2652 if (bwr.read_size > 0) {
2653 ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
2654 if (!list_empty(&proc->todo))
2655 wake_up_interruptible(&proc->wait);
2656 if (ret < 0) {
2657 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2658 ret = -EFAULT;
2659 goto err;
2660 }
2661 }
2662 binder_debug(BINDER_DEBUG_READ_WRITE,
2663 "binder: %d:%d wrote %ld of %ld, read return %ld of %ld\n",
2664 proc->pid, thread->pid, bwr.write_consumed, bwr.write_size,
2665 bwr.read_consumed, bwr.read_size);
2666 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2667 ret = -EFAULT;
2668 goto err;
2669 }
2670 break;
2671 }
2672 case BINDER_SET_MAX_THREADS:
2673 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2674 ret = -EINVAL;
2675 goto err;
2676 }
2677 break;
2678 case BINDER_SET_CONTEXT_MGR:
2679 if (binder_context_mgr_node != NULL) {
2680 printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set\n");
2681 ret = -EBUSY;
2682 goto err;
2683 }
2684 if (binder_context_mgr_uid != -1) {
2685 if (binder_context_mgr_uid != current->cred->euid) {
2686 printk(KERN_ERR "binder: BINDER_SET_"
2687 "CONTEXT_MGR bad uid %d != %d\n",
2688 current->cred->euid,
2689 binder_context_mgr_uid);
2690 ret = -EPERM;
2691 goto err;
2692 }
2693 } else
2694 binder_context_mgr_uid = current->cred->euid;
2695 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
2696 if (binder_context_mgr_node == NULL) {
2697 ret = -ENOMEM;
2698 goto err;
2699 }
2700 binder_context_mgr_node->local_weak_refs++;
2701 binder_context_mgr_node->local_strong_refs++;
2702 binder_context_mgr_node->has_strong_ref = 1;
2703 binder_context_mgr_node->has_weak_ref = 1;
2704 break;
2705 case BINDER_THREAD_EXIT:
2706 binder_debug(BINDER_DEBUG_THREADS, "binder: %d:%d exit\n",
2707 proc->pid, thread->pid);
2708 binder_free_thread(proc, thread);
2709 thread = NULL;
2710 break;
2711 case BINDER_VERSION:
2712 if (size != sizeof(struct binder_version)) {
2713 ret = -EINVAL;
2714 goto err;
2715 }
2716 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
2717 ret = -EINVAL;
2718 goto err;
2719 }
2720 break;
2721 default:
2722 ret = -EINVAL;
2723 goto err;
2724 }
2725 ret = 0;
2726 err:
2727 if (thread)
2728 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2729 mutex_unlock(&binder_lock);
2730 wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2731 if (ret && ret != -ERESTARTSYS)
2732 printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2733 return ret;
2734 }
2735
2736 static void binder_vma_open(struct vm_area_struct *vma)
2737 {
2738 struct binder_proc *proc = vma->vm_private_data;
2739 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2740 "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2741 proc->pid, vma->vm_start, vma->vm_end,
2742 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2743 (unsigned long)pgprot_val(vma->vm_page_prot));
2744 dump_stack();
2745 }
2746
2747 static void binder_vma_close(struct vm_area_struct *vma)
2748 {
2749 struct binder_proc *proc = vma->vm_private_data;
2750 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2751 "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2752 proc->pid, vma->vm_start, vma->vm_end,
2753 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2754 (unsigned long)pgprot_val(vma->vm_page_prot));
2755 proc->vma = NULL;
2756 binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2757 }
2758
2759 static struct vm_operations_struct binder_vm_ops = {
2760 .open = binder_vma_open,
2761 .close = binder_vma_close,
2762 };
2763
2764 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2765 {
2766 int ret;
2767 struct vm_struct *area;
2768 struct binder_proc *proc = filp->private_data;
2769 const char *failure_string;
2770 struct binder_buffer *buffer;
2771
2772 if ((vma->vm_end - vma->vm_start) > SZ_4M)
2773 vma->vm_end = vma->vm_start + SZ_4M;
2774
2775 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2776 "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2777 proc->pid, vma->vm_start, vma->vm_end,
2778 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2779 (unsigned long)pgprot_val(vma->vm_page_prot));
2780
2781 if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2782 ret = -EPERM;
2783 failure_string = "bad vm_flags";
2784 goto err_bad_arg;
2785 }
2786 vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2787
2788 if (proc->buffer) {
2789 ret = -EBUSY;
2790 failure_string = "already mapped";
2791 goto err_already_mapped;
2792 }
2793
2794 area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2795 if (area == NULL) {
2796 ret = -ENOMEM;
2797 failure_string = "get_vm_area";
2798 goto err_get_vm_area_failed;
2799 }
2800 proc->buffer = area->addr;
2801 proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2802
2803 #ifdef CONFIG_CPU_CACHE_VIPT
2804 if (cache_is_vipt_aliasing()) {
2805 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2806 printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2807 vma->vm_start += PAGE_SIZE;
2808 }
2809 }
2810 #endif
2811 proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2812 if (proc->pages == NULL) {
2813 ret = -ENOMEM;
2814 failure_string = "alloc page array";
2815 goto err_alloc_pages_failed;
2816 }
2817 proc->buffer_size = vma->vm_end - vma->vm_start;
2818
2819 vma->vm_ops = &binder_vm_ops;
2820 vma->vm_private_data = proc;
2821
2822 if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2823 ret = -ENOMEM;
2824 failure_string = "alloc small buf";
2825 goto err_alloc_small_buf_failed;
2826 }
2827 buffer = proc->buffer;
2828 INIT_LIST_HEAD(&proc->buffers);
2829 list_add(&buffer->entry, &proc->buffers);
2830 buffer->free = 1;
2831 binder_insert_free_buffer(proc, buffer);
2832 proc->free_async_space = proc->buffer_size / 2;
2833 barrier();
2834 proc->files = get_files_struct(current);
2835 proc->vma = vma;
2836
2837 /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p\n",
2838 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2839 return 0;
2840
2841 err_alloc_small_buf_failed:
2842 kfree(proc->pages);
2843 proc->pages = NULL;
2844 err_alloc_pages_failed:
2845 vfree(proc->buffer);
2846 proc->buffer = NULL;
2847 err_get_vm_area_failed:
2848 err_already_mapped:
2849 err_bad_arg:
2850 printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n",
2851 proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2852 return ret;
2853 }
2854
2855 static int binder_open(struct inode *nodp, struct file *filp)
2856 {
2857 struct binder_proc *proc;
2858
2859 binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2860 current->group_leader->pid, current->pid);
2861
2862 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2863 if (proc == NULL)
2864 return -ENOMEM;
2865 get_task_struct(current);
2866 proc->tsk = current;
2867 INIT_LIST_HEAD(&proc->todo);
2868 init_waitqueue_head(&proc->wait);
2869 proc->default_priority = task_nice(current);
2870 mutex_lock(&binder_lock);
2871 binder_stats_created(BINDER_STAT_PROC);
2872 hlist_add_head(&proc->proc_node, &binder_procs);
2873 proc->pid = current->group_leader->pid;
2874 INIT_LIST_HEAD(&proc->delivered_death);
2875 filp->private_data = proc;
2876 mutex_unlock(&binder_lock);
2877
2878 if (binder_proc_dir_entry_proc) {
2879 char strbuf[11];
2880 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2881 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2882 create_proc_read_entry(strbuf, S_IRUGO,
2883 binder_proc_dir_entry_proc,
2884 binder_read_proc_proc, proc);
2885 }
2886
2887 return 0;
2888 }
2889
2890 static int binder_flush(struct file *filp, fl_owner_t id)
2891 {
2892 struct binder_proc *proc = filp->private_data;
2893
2894 binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2895
2896 return 0;
2897 }
2898
2899 static void binder_deferred_flush(struct binder_proc *proc)
2900 {
2901 struct rb_node *n;
2902 int wake_count = 0;
2903 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2904 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2905 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2906 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2907 wake_up_interruptible(&thread->wait);
2908 wake_count++;
2909 }
2910 }
2911 wake_up_interruptible_all(&proc->wait);
2912
2913 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2914 "binder_flush: %d woke %d threads\n", proc->pid,
2915 wake_count);
2916 }
2917
2918 static int binder_release(struct inode *nodp, struct file *filp)
2919 {
2920 struct binder_proc *proc = filp->private_data;
2921 if (binder_proc_dir_entry_proc) {
2922 char strbuf[11];
2923 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2924 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
2925 }
2926
2927 binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2928
2929 return 0;
2930 }
2931
2932 static void binder_deferred_release(struct binder_proc *proc)
2933 {
2934 struct hlist_node *pos;
2935 struct binder_transaction *t;
2936 struct rb_node *n;
2937 int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
2938
2939 BUG_ON(proc->vma);
2940 BUG_ON(proc->files);
2941
2942 hlist_del(&proc->proc_node);
2943 if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
2944 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2945 "binder_release: %d context_mgr_node gone\n",
2946 proc->pid);
2947 binder_context_mgr_node = NULL;
2948 }
2949
2950 threads = 0;
2951 active_transactions = 0;
2952 while ((n = rb_first(&proc->threads))) {
2953 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2954 threads++;
2955 active_transactions += binder_free_thread(proc, thread);
2956 }
2957 nodes = 0;
2958 incoming_refs = 0;
2959 while ((n = rb_first(&proc->nodes))) {
2960 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
2961
2962 nodes++;
2963 rb_erase(&node->rb_node, &proc->nodes);
2964 list_del_init(&node->work.entry);
2965 if (hlist_empty(&node->refs)) {
2966 kfree(node);
2967 binder_stats_deleted(BINDER_STAT_NODE);
2968 } else {
2969 struct binder_ref *ref;
2970 int death = 0;
2971
2972 node->proc = NULL;
2973 node->local_strong_refs = 0;
2974 node->local_weak_refs = 0;
2975 hlist_add_head(&node->dead_node, &binder_dead_nodes);
2976
2977 hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
2978 incoming_refs++;
2979 if (ref->death) {
2980 death++;
2981 if (list_empty(&ref->death->work.entry)) {
2982 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2983 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
2984 wake_up_interruptible(&ref->proc->wait);
2985 } else
2986 BUG();
2987 }
2988 }
2989 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2990 "binder: node %d now dead, "
2991 "refs %d, death %d\n", node->debug_id,
2992 incoming_refs, death);
2993 }
2994 }
2995 outgoing_refs = 0;
2996 while ((n = rb_first(&proc->refs_by_desc))) {
2997 struct binder_ref *ref = rb_entry(n, struct binder_ref,
2998 rb_node_desc);
2999 outgoing_refs++;
3000 binder_delete_ref(ref);
3001 }
3002 binder_release_work(&proc->todo);
3003 buffers = 0;
3004
3005 while ((n = rb_first(&proc->allocated_buffers))) {
3006 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer,
3007 rb_node);
3008 t = buffer->transaction;
3009 if (t) {
3010 t->buffer = NULL;
3011 buffer->transaction = NULL;
3012 printk(KERN_ERR "binder: release proc %d, "
3013 "transaction %d, not freed\n",
3014 proc->pid, t->debug_id);
3015 /*BUG();*/
3016 }
3017 binder_free_buf(proc, buffer);
3018 buffers++;
3019 }
3020
3021 binder_stats_deleted(BINDER_STAT_PROC);
3022
3023 page_count = 0;
3024 if (proc->pages) {
3025 int i;
3026 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3027 if (proc->pages[i]) {
3028 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3029 "binder_release: %d: "
3030 "page %d at %p not freed\n",
3031 proc->pid, i,
3032 proc->buffer + i * PAGE_SIZE);
3033 __free_page(proc->pages[i]);
3034 page_count++;
3035 }
3036 }
3037 kfree(proc->pages);
3038 vfree(proc->buffer);
3039 }
3040
3041 put_task_struct(proc->tsk);
3042
3043 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3044 "binder_release: %d threads %d, nodes %d (ref %d), "
3045 "refs %d, active transactions %d, buffers %d, "
3046 "pages %d\n",
3047 proc->pid, threads, nodes, incoming_refs, outgoing_refs,
3048 active_transactions, buffers, page_count);
3049
3050 kfree(proc);
3051 }
3052
3053 static void binder_deferred_func(struct work_struct *work)
3054 {
3055 struct binder_proc *proc;
3056 struct files_struct *files;
3057
3058 int defer;
3059 do {
3060 mutex_lock(&binder_lock);
3061 mutex_lock(&binder_deferred_lock);
3062 if (!hlist_empty(&binder_deferred_list)) {
3063 proc = hlist_entry(binder_deferred_list.first,
3064 struct binder_proc, deferred_work_node);
3065 hlist_del_init(&proc->deferred_work_node);
3066 defer = proc->deferred_work;
3067 proc->deferred_work = 0;
3068 } else {
3069 proc = NULL;
3070 defer = 0;
3071 }
3072 mutex_unlock(&binder_deferred_lock);
3073
3074 files = NULL;
3075 if (defer & BINDER_DEFERRED_PUT_FILES) {
3076 files = proc->files;
3077 if (files)
3078 proc->files = NULL;
3079 }
3080
3081 if (defer & BINDER_DEFERRED_FLUSH)
3082 binder_deferred_flush(proc);
3083
3084 if (defer & BINDER_DEFERRED_RELEASE)
3085 binder_deferred_release(proc); /* frees proc */
3086
3087 mutex_unlock(&binder_lock);
3088 if (files)
3089 put_files_struct(files);
3090 } while (proc);
3091 }
3092 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3093
3094 static void
3095 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3096 {
3097 mutex_lock(&binder_deferred_lock);
3098 proc->deferred_work |= defer;
3099 if (hlist_unhashed(&proc->deferred_work_node)) {
3100 hlist_add_head(&proc->deferred_work_node,
3101 &binder_deferred_list);
3102 schedule_work(&binder_deferred_work);
3103 }
3104 mutex_unlock(&binder_deferred_lock);
3105 }
3106
3107 static char *print_binder_transaction(char *buf, char *end, const char *prefix,
3108 struct binder_transaction *t)
3109 {
3110 buf += snprintf(buf, end - buf,
3111 "%s %d: %p from %d:%d to %d:%d code %x "
3112 "flags %x pri %ld r%d",
3113 prefix, t->debug_id, t,
3114 t->from ? t->from->proc->pid : 0,
3115 t->from ? t->from->pid : 0,
3116 t->to_proc ? t->to_proc->pid : 0,
3117 t->to_thread ? t->to_thread->pid : 0,
3118 t->code, t->flags, t->priority, t->need_reply);
3119 if (buf >= end)
3120 return buf;
3121 if (t->buffer == NULL) {
3122 buf += snprintf(buf, end - buf, " buffer free\n");
3123 return buf;
3124 }
3125 if (t->buffer->target_node) {
3126 buf += snprintf(buf, end - buf, " node %d",
3127 t->buffer->target_node->debug_id);
3128 if (buf >= end)
3129 return buf;
3130 }
3131 buf += snprintf(buf, end - buf, " size %zd:%zd data %p\n",
3132 t->buffer->data_size, t->buffer->offsets_size,
3133 t->buffer->data);
3134 return buf;
3135 }
3136
3137 static char *print_binder_buffer(char *buf, char *end, const char *prefix,
3138 struct binder_buffer *buffer)
3139 {
3140 buf += snprintf(buf, end - buf, "%s %d: %p size %zd:%zd %s\n",
3141 prefix, buffer->debug_id, buffer->data,
3142 buffer->data_size, buffer->offsets_size,
3143 buffer->transaction ? "active" : "delivered");
3144 return buf;
3145 }
3146
3147 static char *print_binder_work(char *buf, char *end, const char *prefix,
3148 const char *transaction_prefix,
3149 struct binder_work *w)
3150 {
3151 struct binder_node *node;
3152 struct binder_transaction *t;
3153
3154 switch (w->type) {
3155 case BINDER_WORK_TRANSACTION:
3156 t = container_of(w, struct binder_transaction, work);
3157 buf = print_binder_transaction(buf, end, transaction_prefix, t);
3158 break;
3159 case BINDER_WORK_TRANSACTION_COMPLETE:
3160 buf += snprintf(buf, end - buf,
3161 "%stransaction complete\n", prefix);
3162 break;
3163 case BINDER_WORK_NODE:
3164 node = container_of(w, struct binder_node, work);
3165 buf += snprintf(buf, end - buf, "%snode work %d: u%p c%p\n",
3166 prefix, node->debug_id, node->ptr,
3167 node->cookie);
3168 break;
3169 case BINDER_WORK_DEAD_BINDER:
3170 buf += snprintf(buf, end - buf, "%shas dead binder\n", prefix);
3171 break;
3172 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3173 buf += snprintf(buf, end - buf,
3174 "%shas cleared dead binder\n", prefix);
3175 break;
3176 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3177 buf += snprintf(buf, end - buf,
3178 "%shas cleared death notification\n", prefix);
3179 break;
3180 default:
3181 buf += snprintf(buf, end - buf, "%sunknown work: type %d\n",
3182 prefix, w->type);
3183 break;
3184 }
3185 return buf;
3186 }
3187
3188 static char *print_binder_thread(char *buf, char *end,
3189 struct binder_thread *thread,
3190 int print_always)
3191 {
3192 struct binder_transaction *t;
3193 struct binder_work *w;
3194 char *start_buf = buf;
3195 char *header_buf;
3196
3197 buf += snprintf(buf, end - buf, " thread %d: l %02x\n",
3198 thread->pid, thread->looper);
3199 header_buf = buf;
3200 t = thread->transaction_stack;
3201 while (t) {
3202 if (buf >= end)
3203 break;
3204 if (t->from == thread) {
3205 buf = print_binder_transaction(buf, end,
3206 " outgoing transaction", t);
3207 t = t->from_parent;
3208 } else if (t->to_thread == thread) {
3209 buf = print_binder_transaction(buf, end,
3210 " incoming transaction", t);
3211 t = t->to_parent;
3212 } else {
3213 buf = print_binder_transaction(buf, end,
3214 " bad transaction", t);
3215 t = NULL;
3216 }
3217 }
3218 list_for_each_entry(w, &thread->todo, entry) {
3219 if (buf >= end)
3220 break;
3221 buf = print_binder_work(buf, end, " ",
3222 " pending transaction", w);
3223 }
3224 if (!print_always && buf == header_buf)
3225 buf = start_buf;
3226 return buf;
3227 }
3228
3229 static char *print_binder_node(char *buf, char *end, struct binder_node *node)
3230 {
3231 struct binder_ref *ref;
3232 struct hlist_node *pos;
3233 struct binder_work *w;
3234 int count;
3235
3236 count = 0;
3237 hlist_for_each_entry(ref, pos, &node->refs, node_entry)
3238 count++;
3239
3240 buf += snprintf(buf, end - buf,
3241 " node %d: u%p c%p hs %d hw %d ls %d lw %d "
3242 "is %d iw %d",
3243 node->debug_id, node->ptr, node->cookie,
3244 node->has_strong_ref, node->has_weak_ref,
3245 node->local_strong_refs, node->local_weak_refs,
3246 node->internal_strong_refs, count);
3247 if (buf >= end)
3248 return buf;
3249 if (count) {
3250 buf += snprintf(buf, end - buf, " proc");
3251 if (buf >= end)
3252 return buf;
3253 hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
3254 buf += snprintf(buf, end - buf, " %d", ref->proc->pid);
3255 if (buf >= end)
3256 return buf;
3257 }
3258 }
3259 buf += snprintf(buf, end - buf, "\n");
3260 list_for_each_entry(w, &node->async_todo, entry) {
3261 if (buf >= end)
3262 break;
3263 buf = print_binder_work(buf, end, " ",
3264 " pending async transaction", w);
3265 }
3266 return buf;
3267 }
3268
3269 static char *print_binder_ref(char *buf, char *end, struct binder_ref *ref)
3270 {
3271 buf += snprintf(buf, end - buf,
3272 " ref %d: desc %d %snode %d s %d w %d d %p\n",
3273 ref->debug_id, ref->desc,
3274 ref->node->proc ? "" : "dead ", ref->node->debug_id,
3275 ref->strong, ref->weak, ref->death);
3276 return buf;
3277 }
3278
3279 static char *print_binder_proc(char *buf, char *end,
3280 struct binder_proc *proc, int print_all)
3281 {
3282 struct binder_work *w;
3283 struct rb_node *n;
3284 char *start_buf = buf;
3285 char *header_buf;
3286
3287 buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3288 header_buf = buf;
3289
3290 for (n = rb_first(&proc->threads);
3291 n != NULL && buf < end;
3292 n = rb_next(n))
3293 buf = print_binder_thread(buf, end,
3294 rb_entry(n, struct binder_thread,
3295 rb_node), print_all);
3296 for (n = rb_first(&proc->nodes);
3297 n != NULL && buf < end;
3298 n = rb_next(n)) {
3299 struct binder_node *node = rb_entry(n, struct binder_node,
3300 rb_node);
3301 if (print_all || node->has_async_transaction)
3302 buf = print_binder_node(buf, end, node);
3303 }
3304 if (print_all) {
3305 for (n = rb_first(&proc->refs_by_desc);
3306 n != NULL && buf < end;
3307 n = rb_next(n))
3308 buf = print_binder_ref(buf, end,
3309 rb_entry(n, struct binder_ref,
3310 rb_node_desc));
3311 }
3312 for (n = rb_first(&proc->allocated_buffers);
3313 n != NULL && buf < end;
3314 n = rb_next(n))
3315 buf = print_binder_buffer(buf, end, " buffer",
3316 rb_entry(n, struct binder_buffer,
3317 rb_node));
3318 list_for_each_entry(w, &proc->todo, entry) {
3319 if (buf >= end)
3320 break;
3321 buf = print_binder_work(buf, end, " ",
3322 " pending transaction", w);
3323 }
3324 list_for_each_entry(w, &proc->delivered_death, entry) {
3325 if (buf >= end)
3326 break;
3327 buf += snprintf(buf, end - buf,
3328 " has delivered dead binder\n");
3329 break;
3330 }
3331 if (!print_all && buf == header_buf)
3332 buf = start_buf;
3333 return buf;
3334 }
3335
3336 static const char *binder_return_strings[] = {
3337 "BR_ERROR",
3338 "BR_OK",
3339 "BR_TRANSACTION",
3340 "BR_REPLY",
3341 "BR_ACQUIRE_RESULT",
3342 "BR_DEAD_REPLY",
3343 "BR_TRANSACTION_COMPLETE",
3344 "BR_INCREFS",
3345 "BR_ACQUIRE",
3346 "BR_RELEASE",
3347 "BR_DECREFS",
3348 "BR_ATTEMPT_ACQUIRE",
3349 "BR_NOOP",
3350 "BR_SPAWN_LOOPER",
3351 "BR_FINISHED",
3352 "BR_DEAD_BINDER",
3353 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3354 "BR_FAILED_REPLY"
3355 };
3356
3357 static const char *binder_command_strings[] = {
3358 "BC_TRANSACTION",
3359 "BC_REPLY",
3360 "BC_ACQUIRE_RESULT",
3361 "BC_FREE_BUFFER",
3362 "BC_INCREFS",
3363 "BC_ACQUIRE",
3364 "BC_RELEASE",
3365 "BC_DECREFS",
3366 "BC_INCREFS_DONE",
3367 "BC_ACQUIRE_DONE",
3368 "BC_ATTEMPT_ACQUIRE",
3369 "BC_REGISTER_LOOPER",
3370 "BC_ENTER_LOOPER",
3371 "BC_EXIT_LOOPER",
3372 "BC_REQUEST_DEATH_NOTIFICATION",
3373 "BC_CLEAR_DEATH_NOTIFICATION",
3374 "BC_DEAD_BINDER_DONE"
3375 };
3376
3377 static const char *binder_objstat_strings[] = {
3378 "proc",
3379 "thread",
3380 "node",
3381 "ref",
3382 "death",
3383 "transaction",
3384 "transaction_complete"
3385 };
3386
3387 static char *print_binder_stats(char *buf, char *end, const char *prefix,
3388 struct binder_stats *stats)
3389 {
3390 int i;
3391
3392 BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3393 ARRAY_SIZE(binder_command_strings));
3394 for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3395 if (stats->bc[i])
3396 buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3397 binder_command_strings[i],
3398 stats->bc[i]);
3399 if (buf >= end)
3400 return buf;
3401 }
3402
3403 BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3404 ARRAY_SIZE(binder_return_strings));
3405 for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3406 if (stats->br[i])
3407 buf += snprintf(buf, end - buf, "%s%s: %d\n", prefix,
3408 binder_return_strings[i], stats->br[i]);
3409 if (buf >= end)
3410 return buf;
3411 }
3412
3413 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3414 ARRAY_SIZE(binder_objstat_strings));
3415 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3416 ARRAY_SIZE(stats->obj_deleted));
3417 for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3418 if (stats->obj_created[i] || stats->obj_deleted[i])
3419 buf += snprintf(buf, end - buf,
3420 "%s%s: active %d total %d\n", prefix,
3421 binder_objstat_strings[i],
3422 stats->obj_created[i] -
3423 stats->obj_deleted[i],
3424 stats->obj_created[i]);
3425 if (buf >= end)
3426 return buf;
3427 }
3428 return buf;
3429 }
3430
3431 static char *print_binder_proc_stats(char *buf, char *end,
3432 struct binder_proc *proc)
3433 {
3434 struct binder_work *w;
3435 struct rb_node *n;
3436 int count, strong, weak;
3437
3438 buf += snprintf(buf, end - buf, "proc %d\n", proc->pid);
3439 if (buf >= end)
3440 return buf;
3441 count = 0;
3442 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3443 count++;
3444 buf += snprintf(buf, end - buf, " threads: %d\n", count);
3445 if (buf >= end)
3446 return buf;
3447 buf += snprintf(buf, end - buf, " requested threads: %d+%d/%d\n"
3448 " ready threads %d\n"
3449 " free async space %zd\n", proc->requested_threads,
3450 proc->requested_threads_started, proc->max_threads,
3451 proc->ready_threads, proc->free_async_space);
3452 if (buf >= end)
3453 return buf;
3454 count = 0;
3455 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3456 count++;
3457 buf += snprintf(buf, end - buf, " nodes: %d\n", count);
3458 if (buf >= end)
3459 return buf;
3460 count = 0;
3461 strong = 0;
3462 weak = 0;
3463 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3464 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3465 rb_node_desc);
3466 count++;
3467 strong += ref->strong;
3468 weak += ref->weak;
3469 }
3470 buf += snprintf(buf, end - buf, " refs: %d s %d w %d\n",
3471 count, strong, weak);
3472 if (buf >= end)
3473 return buf;
3474
3475 count = 0;
3476 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3477 count++;
3478 buf += snprintf(buf, end - buf, " buffers: %d\n", count);
3479 if (buf >= end)
3480 return buf;
3481
3482 count = 0;
3483 list_for_each_entry(w, &proc->todo, entry) {
3484 switch (w->type) {
3485 case BINDER_WORK_TRANSACTION:
3486 count++;
3487 break;
3488 default:
3489 break;
3490 }
3491 }
3492 buf += snprintf(buf, end - buf, " pending transactions: %d\n", count);
3493 if (buf >= end)
3494 return buf;
3495
3496 buf = print_binder_stats(buf, end, " ", &proc->stats);
3497
3498 return buf;
3499 }
3500
3501
3502 static int binder_read_proc_state(char *page, char **start, off_t off,
3503 int count, int *eof, void *data)
3504 {
3505 struct binder_proc *proc;
3506 struct hlist_node *pos;
3507 struct binder_node *node;
3508 int len = 0;
3509 char *buf = page;
3510 char *end = page + PAGE_SIZE;
3511 int do_lock = !binder_debug_no_lock;
3512
3513 if (off)
3514 return 0;
3515
3516 if (do_lock)
3517 mutex_lock(&binder_lock);
3518
3519 buf += snprintf(buf, end - buf, "binder state:\n");
3520
3521 if (!hlist_empty(&binder_dead_nodes))
3522 buf += snprintf(buf, end - buf, "dead nodes:\n");
3523 hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) {
3524 if (buf >= end)
3525 break;
3526 buf = print_binder_node(buf, end, node);
3527 }
3528
3529 hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3530 if (buf >= end)
3531 break;
3532 buf = print_binder_proc(buf, end, proc, 1);
3533 }
3534 if (do_lock)
3535 mutex_unlock(&binder_lock);
3536 if (buf > page + PAGE_SIZE)
3537 buf = page + PAGE_SIZE;
3538
3539 *start = page + off;
3540
3541 len = buf - page;
3542 if (len > off)
3543 len -= off;
3544 else
3545 len = 0;
3546
3547 return len < count ? len : count;
3548 }
3549
3550 static int binder_read_proc_stats(char *page, char **start, off_t off,
3551 int count, int *eof, void *data)
3552 {
3553 struct binder_proc *proc;
3554 struct hlist_node *pos;
3555 int len = 0;
3556 char *p = page;
3557 int do_lock = !binder_debug_no_lock;
3558
3559 if (off)
3560 return 0;
3561
3562 if (do_lock)
3563 mutex_lock(&binder_lock);
3564
3565 p += snprintf(p, PAGE_SIZE, "binder stats:\n");
3566
3567 p = print_binder_stats(p, page + PAGE_SIZE, "", &binder_stats);
3568
3569 hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3570 if (p >= page + PAGE_SIZE)
3571 break;
3572 p = print_binder_proc_stats(p, page + PAGE_SIZE, proc);
3573 }
3574 if (do_lock)
3575 mutex_unlock(&binder_lock);
3576 if (p > page + PAGE_SIZE)
3577 p = page + PAGE_SIZE;
3578
3579 *start = page + off;
3580
3581 len = p - page;
3582 if (len > off)
3583 len -= off;
3584 else
3585 len = 0;
3586
3587 return len < count ? len : count;
3588 }
3589
3590 static int binder_read_proc_transactions(char *page, char **start, off_t off,
3591 int count, int *eof, void *data)
3592 {
3593 struct binder_proc *proc;
3594 struct hlist_node *pos;
3595 int len = 0;
3596 char *buf = page;
3597 char *end = page + PAGE_SIZE;
3598 int do_lock = !binder_debug_no_lock;
3599
3600 if (off)
3601 return 0;
3602
3603 if (do_lock)
3604 mutex_lock(&binder_lock);
3605
3606 buf += snprintf(buf, end - buf, "binder transactions:\n");
3607 hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
3608 if (buf >= end)
3609 break;
3610 buf = print_binder_proc(buf, end, proc, 0);
3611 }
3612 if (do_lock)
3613 mutex_unlock(&binder_lock);
3614 if (buf > page + PAGE_SIZE)
3615 buf = page + PAGE_SIZE;
3616
3617 *start = page + off;
3618
3619 len = buf - page;
3620 if (len > off)
3621 len -= off;
3622 else
3623 len = 0;
3624
3625 return len < count ? len : count;
3626 }
3627
3628 static int binder_read_proc_proc(char *page, char **start, off_t off,
3629 int count, int *eof, void *data)
3630 {
3631 struct binder_proc *proc = data;
3632 int len = 0;
3633 char *p = page;
3634 int do_lock = !binder_debug_no_lock;
3635
3636 if (off)
3637 return 0;
3638
3639 if (do_lock)
3640 mutex_lock(&binder_lock);
3641 p += snprintf(p, PAGE_SIZE, "binder proc state:\n");
3642 p = print_binder_proc(p, page + PAGE_SIZE, proc, 1);
3643 if (do_lock)
3644 mutex_unlock(&binder_lock);
3645
3646 if (p > page + PAGE_SIZE)
3647 p = page + PAGE_SIZE;
3648 *start = page + off;
3649
3650 len = p - page;
3651 if (len > off)
3652 len -= off;
3653 else
3654 len = 0;
3655
3656 return len < count ? len : count;
3657 }
3658
3659 static char *print_binder_transaction_log_entry(char *buf, char *end,
3660 struct binder_transaction_log_entry *e)
3661 {
3662 buf += snprintf(buf, end - buf,
3663 "%d: %s from %d:%d to %d:%d node %d handle %d "
3664 "size %d:%d\n",
3665 e->debug_id, (e->call_type == 2) ? "reply" :
3666 ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3667 e->from_thread, e->to_proc, e->to_thread, e->to_node,
3668 e->target_handle, e->data_size, e->offsets_size);
3669 return buf;
3670 }
3671
3672 static int binder_read_proc_transaction_log(
3673 char *page, char **start, off_t off, int count, int *eof, void *data)
3674 {
3675 struct binder_transaction_log *log = data;
3676 int len = 0;
3677 int i;
3678 char *buf = page;
3679 char *end = page + PAGE_SIZE;
3680
3681 if (off)
3682 return 0;
3683
3684 if (log->full) {
3685 for (i = log->next; i < ARRAY_SIZE(log->entry); i++) {
3686 if (buf >= end)
3687 break;
3688 buf = print_binder_transaction_log_entry(buf, end,
3689 &log->entry[i]);
3690 }
3691 }
3692 for (i = 0; i < log->next; i++) {
3693 if (buf >= end)
3694 break;
3695 buf = print_binder_transaction_log_entry(buf, end,
3696 &log->entry[i]);
3697 }
3698
3699 *start = page + off;
3700
3701 len = buf - page;
3702 if (len > off)
3703 len -= off;
3704 else
3705 len = 0;
3706
3707 return len < count ? len : count;
3708 }
3709
3710 static const struct file_operations binder_fops = {
3711 .owner = THIS_MODULE,
3712 .poll = binder_poll,
3713 .unlocked_ioctl = binder_ioctl,
3714 .mmap = binder_mmap,
3715 .open = binder_open,
3716 .flush = binder_flush,
3717 .release = binder_release,
3718 };
3719
3720 static struct miscdevice binder_miscdev = {
3721 .minor = MISC_DYNAMIC_MINOR,
3722 .name = "binder",
3723 .fops = &binder_fops
3724 };
3725
3726 static int __init binder_init(void)
3727 {
3728 int ret;
3729
3730 binder_proc_dir_entry_root = proc_mkdir("binder", NULL);
3731 if (binder_proc_dir_entry_root)
3732 binder_proc_dir_entry_proc = proc_mkdir("proc",
3733 binder_proc_dir_entry_root);
3734 ret = misc_register(&binder_miscdev);
3735 if (binder_proc_dir_entry_root) {
3736 create_proc_read_entry("state",
3737 S_IRUGO,
3738 binder_proc_dir_entry_root,
3739 binder_read_proc_state,
3740 NULL);
3741 create_proc_read_entry("stats",
3742 S_IRUGO,
3743 binder_proc_dir_entry_root,
3744 binder_read_proc_stats,
3745 NULL);
3746 create_proc_read_entry("transactions",
3747 S_IRUGO,
3748 binder_proc_dir_entry_root,
3749 binder_read_proc_transactions,
3750 NULL);
3751 create_proc_read_entry("transaction_log",
3752 S_IRUGO,
3753 binder_proc_dir_entry_root,
3754 binder_read_proc_transaction_log,
3755 &binder_transaction_log);
3756 create_proc_read_entry("failed_transaction_log",
3757 S_IRUGO,
3758 binder_proc_dir_entry_root,
3759 binder_read_proc_transaction_log,
3760 &binder_transaction_log_failed);
3761 }
3762 return ret;
3763 }
3764
3765 device_initcall(binder_init);
3766
3767 MODULE_LICENSE("GPL v2");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree