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