Pileus Git - ~andy/linux/blob - drivers/staging/android/binder.c

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