kernel/drivers/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <asm/cacheflush.h>
  21 #include <linux/fdtable.h>
  22 #include <linux/file.h>
  23 #include <linux/freezer.h>
  24 #include <linux/fs.h>
  25 #include <linux/list.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/nsproxy.h>
  31 #include <linux/poll.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/rbtree.h>
  34 #include <linux/sched.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/pid_namespace.h>
  40 #include <linux/security.h>
  41
  42 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  43 #define BINDER_IPC_32BIT 1
  44 #endif
  45
  46 #include <uapi/linux/android/binder.h>
  47 #include "binder_trace.h"
  48
  49 static DEFINE_MUTEX(binder_main_lock);
  50 static DEFINE_MUTEX(binder_deferred_lock);
  51 static DEFINE_MUTEX(binder_mmap_lock);
  52
  53 static HLIST_HEAD(binder_procs);
  54 static HLIST_HEAD(binder_deferred_list);
  55 static HLIST_HEAD(binder_dead_nodes);
  56
  57 static struct dentry *binder_debugfs_dir_entry_root;
  58 static struct dentry *binder_debugfs_dir_entry_proc;
  59 static struct binder_node *binder_context_mgr_node;
  60 static kuid_t binder_context_mgr_uid = INVALID_UID;
  61 static int binder_last_id;
  62 static struct workqueue_struct *binder_deferred_workqueue;
  63
  64 #define BINDER_DEBUG_ENTRY(name) \
  65 static int binder_##name##_open(struct inode *inode, struct file *file) \
  66 { \
  67         return single_open(file, binder_##name##_show, inode->i_private); \
  68 } \
  69 \
  70 static const struct file_operations binder_##name##_fops = { \
  71         .owner = THIS_MODULE, \
  72         .open = binder_##name##_open, \
  73         .read = seq_read, \
  74         .llseek = seq_lseek, \
  75         .release = single_release, \
  76 }
  77
  78 static int binder_proc_show(struct seq_file *m, void *unused);
  79 BINDER_DEBUG_ENTRY(proc);
  80
  81 /* This is only defined in include/asm-arm/sizes.h */
  82 #ifndef SZ_1K
  83 #define SZ_1K                               0x400
  84 #endif
  85
  86 #ifndef SZ_4M
  87 #define SZ_4M                               0x400000
  88 #endif
  89
  90 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  91
  92 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  93
  94 enum {
  95         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  96         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  97         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  98         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  99         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
 100         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 101         BINDER_DEBUG_READ_WRITE             = 1U << 6,
 102         BINDER_DEBUG_USER_REFS              = 1U << 7,
 103         BINDER_DEBUG_THREADS                = 1U << 8,
 104         BINDER_DEBUG_TRANSACTION            = 1U << 9,
 105         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 106         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 107         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 108         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 109         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 110         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 111 };
 112 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 113         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 114 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 115
 116 static bool binder_debug_no_lock;
 117 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 118
 119 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 120 static int binder_stop_on_user_error;
 121
 122 static int binder_set_stop_on_user_error(const char *val,
 123                                          struct kernel_param *kp)
 124 {
 125         int ret;
 126
 127         ret = param_set_int(val, kp);
 128         if (binder_stop_on_user_error < 2)
 129                 wake_up(&binder_user_error_wait);
 130         return ret;
 131 }
 132 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 133         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 134
 135 #define binder_debug(mask, x...) \
 136         do { \
 137                 if (binder_debug_mask & mask) \
 138                         pr_info(x); \
 139         } while (0)
 140
 141 #define binder_user_error(x...) \
 142         do { \
 143                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 144                         pr_info(x); \
 145                 if (binder_stop_on_user_error) \
 146                         binder_stop_on_user_error = 2; \
 147         } while (0)
 148
 149 enum binder_stat_types {
 150         BINDER_STAT_PROC,
 151         BINDER_STAT_THREAD,
 152         BINDER_STAT_NODE,
 153         BINDER_STAT_REF,
 154         BINDER_STAT_DEATH,
 155         BINDER_STAT_TRANSACTION,
 156         BINDER_STAT_TRANSACTION_COMPLETE,
 157         BINDER_STAT_COUNT
 158 };
 159
 160 struct binder_stats {
 161         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 162         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 163         int obj_created[BINDER_STAT_COUNT];
 164         int obj_deleted[BINDER_STAT_COUNT];
 165 };
 166
 167 static struct binder_stats binder_stats;
 168
 169 static inline void binder_stats_deleted(enum binder_stat_types type)
 170 {
 171         binder_stats.obj_deleted[type]++;
 172 }
 173
 174 static inline void binder_stats_created(enum binder_stat_types type)
 175 {
 176         binder_stats.obj_created[type]++;
 177 }
 178
 179 struct binder_transaction_log_entry {
 180         int debug_id;
 181         int call_type;
 182         int from_proc;
 183         int from_thread;
 184         int target_handle;
 185         int to_proc;
 186         int to_thread;
 187         int to_node;
 188         int data_size;
 189         int offsets_size;
 190 };
 191 struct binder_transaction_log {
 192         int next;
 193         int full;
 194         struct binder_transaction_log_entry entry[32];
 195 };
 196 static struct binder_transaction_log binder_transaction_log;
 197 static struct binder_transaction_log binder_transaction_log_failed;
 198
 199 static struct binder_transaction_log_entry *binder_transaction_log_add(
 200         struct binder_transaction_log *log)
 201 {
 202         struct binder_transaction_log_entry *e;
 203
 204         e = &log->entry[log->next];
 205         memset(e, 0, sizeof(*e));
 206         log->next++;
 207         if (log->next == ARRAY_SIZE(log->entry)) {
 208                 log->next = 0;
 209                 log->full = 1;
 210         }
 211         return e;
 212 }
 213
 214 struct binder_work {
 215         struct list_head entry;
 216         enum {
 217                 BINDER_WORK_TRANSACTION = 1,
 218                 BINDER_WORK_TRANSACTION_COMPLETE,
 219                 BINDER_WORK_NODE,
 220                 BINDER_WORK_DEAD_BINDER,
 221                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 222                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 223         } type;
 224 };
 225
 226 struct binder_node {
 227         int debug_id;
 228         struct binder_work work;
 229         union {
 230                 struct rb_node rb_node;
 231                 struct hlist_node dead_node;
 232         };
 233         struct binder_proc *proc;
 234         struct hlist_head refs;
 235         int internal_strong_refs;
 236         int local_weak_refs;
 237         int local_strong_refs;
 238         binder_uintptr_t ptr;
 239         binder_uintptr_t cookie;
 240         unsigned has_strong_ref:1;
 241         unsigned pending_strong_ref:1;
 242         unsigned has_weak_ref:1;
 243         unsigned pending_weak_ref:1;
 244         unsigned has_async_transaction:1;
 245         unsigned accept_fds:1;
 246         unsigned min_priority:8;
 247         struct list_head async_todo;
 248 };
 249
 250 struct binder_ref_death {
 251         struct binder_work work;
 252         binder_uintptr_t cookie;
 253 };
 254
 255 struct binder_ref {
 256         /* Lookups needed: */
 257         /*   node + proc => ref (transaction) */
 258         /*   desc + proc => ref (transaction, inc/dec ref) */
 259         /*   node => refs + procs (proc exit) */
 260         int debug_id;
 261         struct rb_node rb_node_desc;
 262         struct rb_node rb_node_node;
 263         struct hlist_node node_entry;
 264         struct binder_proc *proc;
 265         struct binder_node *node;
 266         uint32_t desc;
 267         int strong;
 268         int weak;
 269         struct binder_ref_death *death;
 270 };
 271
 272 struct binder_buffer {
 273         struct list_head entry; /* free and allocated entries by address */
 274         struct rb_node rb_node; /* free entry by size or allocated entry */
 275                                 /* by address */
 276         unsigned free:1;
 277         unsigned allow_user_free:1;
 278         unsigned async_transaction:1;
 279         unsigned debug_id:29;
 280
 281         struct binder_transaction *transaction;
 282
 283         struct binder_node *target_node;
 284         size_t data_size;
 285         size_t offsets_size;
 286         uint8_t data[0];
 287 };
 288
 289 enum binder_deferred_state {
 290         BINDER_DEFERRED_PUT_FILES    = 0x01,
 291         BINDER_DEFERRED_FLUSH        = 0x02,
 292         BINDER_DEFERRED_RELEASE      = 0x04,
 293 };
 294
 295 struct binder_proc {
 296         struct hlist_node proc_node;
 297         struct rb_root threads;
 298         struct rb_root nodes;
 299         struct rb_root refs_by_desc;
 300         struct rb_root refs_by_node;
 301         int pid;
 302         struct vm_area_struct *vma;
 303         struct mm_struct *vma_vm_mm;
 304         struct task_struct *tsk;
 305         struct files_struct *files;
 306         struct hlist_node deferred_work_node;
 307         int deferred_work;
 308         void *buffer;
 309         ptrdiff_t user_buffer_offset;
 310
 311         struct list_head buffers;
 312         struct rb_root free_buffers;
 313         struct rb_root allocated_buffers;
 314         size_t free_async_space;
 315
 316         struct page **pages;
 317         size_t buffer_size;
 318         uint32_t buffer_free;
 319         struct list_head todo;
 320         wait_queue_head_t wait;
 321         struct binder_stats stats;
 322         struct list_head delivered_death;
 323         int max_threads;
 324         int requested_threads;
 325         int requested_threads_started;
 326         int ready_threads;
 327         long default_priority;
 328         struct dentry *debugfs_entry;
 329 };
 330
 331 enum {
 332         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 333         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 334         BINDER_LOOPER_STATE_EXITED      = 0x04,
 335         BINDER_LOOPER_STATE_INVALID     = 0x08,
 336         BINDER_LOOPER_STATE_WAITING     = 0x10,
 337         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 338 };
 339
 340 struct binder_thread {
 341         struct binder_proc *proc;
 342         struct rb_node rb_node;
 343         int pid;
 344         int looper;
 345         struct binder_transaction *transaction_stack;
 346         struct list_head todo;
 347         uint32_t return_error; /* Write failed, return error code in read buf */
 348         uint32_t return_error2; /* Write failed, return error code in read */
 349                 /* buffer. Used when sending a reply to a dead process that */
 350                 /* we are also waiting on */
 351         wait_queue_head_t wait;
 352         struct binder_stats stats;
 353 };
 354
 355 struct binder_transaction {
 356         int debug_id;
 357         struct binder_work work;
 358         struct binder_thread *from;
 359         struct binder_transaction *from_parent;
 360         struct binder_proc *to_proc;
 361         struct binder_thread *to_thread;
 362         struct binder_transaction *to_parent;
 363         unsigned need_reply:1;
 364         /* unsigned is_dead:1; */       /* not used at the moment */
 365
 366         struct binder_buffer *buffer;
 367         unsigned int    code;
 368         unsigned int    flags;
 369         long    priority;
 370         long    saved_priority;
 371         kuid_t  sender_euid;
 372 };
 373
 374 static void
 375 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 376
 377 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 378 {
 379         struct files_struct *files = proc->files;
 380         unsigned long rlim_cur;
 381         unsigned long irqs;
 382
 383         if (files == NULL)
 384                 return -ESRCH;
 385
 386         if (!lock_task_sighand(proc->tsk, &irqs))
 387                 return -EMFILE;
 388
 389         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 390         unlock_task_sighand(proc->tsk, &irqs);
 391
 392         return __alloc_fd(files, 0, rlim_cur, flags);
 393 }
 394
 395 /*
 396  * copied from fd_install
 397  */
 398 static void task_fd_install(
 399         struct binder_proc *proc, unsigned int fd, struct file *file)
 400 {
 401         if (proc->files)
 402                 __fd_install(proc->files, fd, file);
 403 }
 404
 405 /*
 406  * copied from sys_close
 407  */
 408 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 409 {
 410         int retval;
 411
 412         if (proc->files == NULL)
 413                 return -ESRCH;
 414
 415         retval = __close_fd(proc->files, fd);
 416         /* can't restart close syscall because file table entry was cleared */
 417         if (unlikely(retval == -ERESTARTSYS ||
 418                      retval == -ERESTARTNOINTR ||
 419                      retval == -ERESTARTNOHAND ||
 420                      retval == -ERESTART_RESTARTBLOCK))
 421                 retval = -EINTR;
 422
 423         return retval;
 424 }
 425
 426 static inline void binder_lock(const char *tag)
 427 {
 428         trace_binder_lock(tag);
 429         mutex_lock(&binder_main_lock);
 430         trace_binder_locked(tag);
 431 }
 432
 433 static inline void binder_unlock(const char *tag)
 434 {
 435         trace_binder_unlock(tag);
 436         mutex_unlock(&binder_main_lock);
 437 }
 438
 439 static void binder_set_nice(long nice)
 440 {
 441         long min_nice;
 442
 443         if (can_nice(current, nice)) {
 444                 set_user_nice(current, nice);
 445                 return;
 446         }
 447         min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 448         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 449                      "%d: nice value %ld not allowed use %ld instead\n",
 450                       current->pid, nice, min_nice);
 451         set_user_nice(current, min_nice);
 452         if (min_nice <= MAX_NICE)
 453                 return;
 454         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 455 }
 456
 457 static size_t binder_buffer_size(struct binder_proc *proc,
 458                                  struct binder_buffer *buffer)
 459 {
 460         if (list_is_last(&buffer->entry, &proc->buffers))
 461                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 462         return (size_t)list_entry(buffer->entry.next,
 463                           struct binder_buffer, entry) - (size_t)buffer->data;
 464 }
 465
 466 static void binder_insert_free_buffer(struct binder_proc *proc,
 467                                       struct binder_buffer *new_buffer)
 468 {
 469         struct rb_node **p = &proc->free_buffers.rb_node;
 470         struct rb_node *parent = NULL;
 471         struct binder_buffer *buffer;
 472         size_t buffer_size;
 473         size_t new_buffer_size;
 474
 475         BUG_ON(!new_buffer->free);
 476
 477         new_buffer_size = binder_buffer_size(proc, new_buffer);
 478
 479         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 480                      "%d: add free buffer, size %zd, at %p\n",
 481                       proc->pid, new_buffer_size, new_buffer);
 482
 483         while (*p) {
 484                 parent = *p;
 485                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 486                 BUG_ON(!buffer->free);
 487
 488                 buffer_size = binder_buffer_size(proc, buffer);
 489
 490                 if (new_buffer_size < buffer_size)
 491                         p = &parent->rb_left;
 492                 else
 493                         p = &parent->rb_right;
 494         }
 495         rb_link_node(&new_buffer->rb_node, parent, p);
 496         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 497 }
 498
 499 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 500                                            struct binder_buffer *new_buffer)
 501 {
 502         struct rb_node **p = &proc->allocated_buffers.rb_node;
 503         struct rb_node *parent = NULL;
 504         struct binder_buffer *buffer;
 505
 506         BUG_ON(new_buffer->free);
 507
 508         while (*p) {
 509                 parent = *p;
 510                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 511                 BUG_ON(buffer->free);
 512
 513                 if (new_buffer < buffer)
 514                         p = &parent->rb_left;
 515                 else if (new_buffer > buffer)
 516                         p = &parent->rb_right;
 517                 else
 518                         BUG();
 519         }
 520         rb_link_node(&new_buffer->rb_node, parent, p);
 521         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 522 }
 523
 524 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 525                                                   uintptr_t user_ptr)
 526 {
 527         struct rb_node *n = proc->allocated_buffers.rb_node;
 528         struct binder_buffer *buffer;
 529         struct binder_buffer *kern_ptr;
 530
 531         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 532                 - offsetof(struct binder_buffer, data));
 533
 534         while (n) {
 535                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 536                 BUG_ON(buffer->free);
 537
 538                 if (kern_ptr < buffer)
 539                         n = n->rb_left;
 540                 else if (kern_ptr > buffer)
 541                         n = n->rb_right;
 542                 else
 543                         return buffer;
 544         }
 545         return NULL;
 546 }
 547
 548 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 549                                     void *start, void *end,
 550                                     struct vm_area_struct *vma)
 551 {
 552         void *page_addr;
 553         unsigned long user_page_addr;
 554         struct page **page;
 555         struct mm_struct *mm;
 556
 557         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 558                      "%d: %s pages %p-%p\n", proc->pid,
 559                      allocate ? "allocate" : "free", start, end);
 560
 561         if (end <= start)
 562                 return 0;
 563
 564         trace_binder_update_page_range(proc, allocate, start, end);
 565
 566         if (vma)
 567                 mm = NULL;
 568         else
 569                 mm = get_task_mm(proc->tsk);
 570
 571         if (mm) {
 572                 down_write(&mm->mmap_sem);
 573                 vma = proc->vma;
 574                 if (vma && mm != proc->vma_vm_mm) {
 575                         pr_err("%d: vma mm and task mm mismatch\n",
 576                                 proc->pid);
 577                         vma = NULL;
 578                 }
 579         }
 580
 581         if (allocate == 0)
 582                 goto free_range;
 583
 584         if (vma == NULL) {
 585                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 586                         proc->pid);
 587                 goto err_no_vma;
 588         }
 589
 590         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 591                 int ret;
 592
 593                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 594
 595                 BUG_ON(*page);
 596                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 597                 if (*page == NULL) {
 598                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 599                                 proc->pid, page_addr);
 600                         goto err_alloc_page_failed;
 601                 }
 602                 ret = map_kernel_range_noflush((unsigned long)page_addr,
 603                                         PAGE_SIZE, PAGE_KERNEL, page);
 604                 flush_cache_vmap((unsigned long)page_addr,
 605                                 (unsigned long)page_addr + PAGE_SIZE);
 606                 if (ret != 1) {
 607                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 608                                proc->pid, page_addr);
 609                         goto err_map_kernel_failed;
 610                 }
 611                 user_page_addr =
 612                         (uintptr_t)page_addr + proc->user_buffer_offset;
 613                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 614                 if (ret) {
 615                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 616                                proc->pid, user_page_addr);
 617                         goto err_vm_insert_page_failed;
 618                 }
 619                 /* vm_insert_page does not seem to increment the refcount */
 620         }
 621         if (mm) {
 622                 up_write(&mm->mmap_sem);
 623                 mmput(mm);
 624         }
 625         return 0;
 626
 627 free_range:
 628         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 629              page_addr -= PAGE_SIZE) {
 630                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 631                 if (vma)
 632                         zap_page_range(vma, (uintptr_t)page_addr +
 633                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 634 err_vm_insert_page_failed:
 635                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 636 err_map_kernel_failed:
 637                 __free_page(*page);
 638                 *page = NULL;
 639 err_alloc_page_failed:
 640                 ;
 641         }
 642 err_no_vma:
 643         if (mm) {
 644                 up_write(&mm->mmap_sem);
 645                 mmput(mm);
 646         }
 647         return -ENOMEM;
 648 }
 649
 650 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 651                                               size_t data_size,
 652                                               size_t offsets_size, int is_async)
 653 {
 654         struct rb_node *n = proc->free_buffers.rb_node;
 655         struct binder_buffer *buffer;
 656         size_t buffer_size;
 657         struct rb_node *best_fit = NULL;
 658         void *has_page_addr;
 659         void *end_page_addr;
 660         size_t size;
 661
 662         if (proc->vma == NULL) {
 663                 pr_err("%d: binder_alloc_buf, no vma\n",
 664                        proc->pid);
 665                 return NULL;
 666         }
 667
 668         size = ALIGN(data_size, sizeof(void *)) +
 669                 ALIGN(offsets_size, sizeof(void *));
 670
 671         if (size < data_size || size < offsets_size) {
 672                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 673                                 proc->pid, data_size, offsets_size);
 674                 return NULL;
 675         }
 676
 677         if (is_async &&
 678             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 679                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 680                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 681                               proc->pid, size);
 682                 return NULL;
 683         }
 684
 685         while (n) {
 686                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 687                 BUG_ON(!buffer->free);
 688                 buffer_size = binder_buffer_size(proc, buffer);
 689
 690                 if (size < buffer_size) {
 691                         best_fit = n;
 692                         n = n->rb_left;
 693                 } else if (size > buffer_size)
 694                         n = n->rb_right;
 695                 else {
 696                         best_fit = n;
 697                         break;
 698                 }
 699         }
 700         if (best_fit == NULL) {
 701                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 702                         proc->pid, size);
 703                 return NULL;
 704         }
 705         if (n == NULL) {
 706                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 707                 buffer_size = binder_buffer_size(proc, buffer);
 708         }
 709
 710         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 711                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 712                       proc->pid, size, buffer, buffer_size);
 713
 714         has_page_addr =
 715                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 716         if (n == NULL) {
 717                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 718                         buffer_size = size; /* no room for other buffers */
 719                 else
 720                         buffer_size = size + sizeof(struct binder_buffer);
 721         }
 722         end_page_addr =
 723                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 724         if (end_page_addr > has_page_addr)
 725                 end_page_addr = has_page_addr;
 726         if (binder_update_page_range(proc, 1,
 727             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 728                 return NULL;
 729
 730         rb_erase(best_fit, &proc->free_buffers);
 731         buffer->free = 0;
 732         binder_insert_allocated_buffer(proc, buffer);
 733         if (buffer_size != size) {
 734                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 735
 736                 list_add(&new_buffer->entry, &buffer->entry);
 737                 new_buffer->free = 1;
 738                 binder_insert_free_buffer(proc, new_buffer);
 739         }
 740         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 741                      "%d: binder_alloc_buf size %zd got %p\n",
 742                       proc->pid, size, buffer);
 743         buffer->data_size = data_size;
 744         buffer->offsets_size = offsets_size;
 745         buffer->async_transaction = is_async;
 746         if (is_async) {
 747                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 748                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 749                              "%d: binder_alloc_buf size %zd async free %zd\n",
 750                               proc->pid, size, proc->free_async_space);
 751         }
 752
 753         return buffer;
 754 }
 755
 756 static void *buffer_start_page(struct binder_buffer *buffer)
 757 {
 758         return (void *)((uintptr_t)buffer & PAGE_MASK);
 759 }
 760
 761 static void *buffer_end_page(struct binder_buffer *buffer)
 762 {
 763         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 764 }
 765
 766 static void binder_delete_free_buffer(struct binder_proc *proc,
 767                                       struct binder_buffer *buffer)
 768 {
 769         struct binder_buffer *prev, *next = NULL;
 770         int free_page_end = 1;
 771         int free_page_start = 1;
 772
 773         BUG_ON(proc->buffers.next == &buffer->entry);
 774         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 775         BUG_ON(!prev->free);
 776         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 777                 free_page_start = 0;
 778                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 779                         free_page_end = 0;
 780                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 781                              "%d: merge free, buffer %p share page with %p\n",
 782                               proc->pid, buffer, prev);
 783         }
 784
 785         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 786                 next = list_entry(buffer->entry.next,
 787                                   struct binder_buffer, entry);
 788                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 789                         free_page_end = 0;
 790                         if (buffer_start_page(next) ==
 791                             buffer_start_page(buffer))
 792                                 free_page_start = 0;
 793                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 794                                      "%d: merge free, buffer %p share page with %p\n",
 795                                       proc->pid, buffer, prev);
 796                 }
 797         }
 798         list_del(&buffer->entry);
 799         if (free_page_start || free_page_end) {
 800                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 801                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 802                              proc->pid, buffer, free_page_start ? "" : " end",
 803                              free_page_end ? "" : " start", prev, next);
 804                 binder_update_page_range(proc, 0, free_page_start ?
 805                         buffer_start_page(buffer) : buffer_end_page(buffer),
 806                         (free_page_end ? buffer_end_page(buffer) :
 807                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 808         }
 809 }
 810
 811 static void binder_free_buf(struct binder_proc *proc,
 812                             struct binder_buffer *buffer)
 813 {
 814         size_t size, buffer_size;
 815
 816         buffer_size = binder_buffer_size(proc, buffer);
 817
 818         size = ALIGN(buffer->data_size, sizeof(void *)) +
 819                 ALIGN(buffer->offsets_size, sizeof(void *));
 820
 821         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 822                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 823                       proc->pid, buffer, size, buffer_size);
 824
 825         BUG_ON(buffer->free);
 826         BUG_ON(size > buffer_size);
 827         BUG_ON(buffer->transaction != NULL);
 828         BUG_ON((void *)buffer < proc->buffer);
 829         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 830
 831         if (buffer->async_transaction) {
 832                 proc->free_async_space += size + sizeof(struct binder_buffer);
 833
 834                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 835                              "%d: binder_free_buf size %zd async free %zd\n",
 836                               proc->pid, size, proc->free_async_space);
 837         }
 838
 839         binder_update_page_range(proc, 0,
 840                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 841                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 842                 NULL);
 843         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 844         buffer->free = 1;
 845         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 846                 struct binder_buffer *next = list_entry(buffer->entry.next,
 847                                                 struct binder_buffer, entry);
 848
 849                 if (next->free) {
 850                         rb_erase(&next->rb_node, &proc->free_buffers);
 851                         binder_delete_free_buffer(proc, next);
 852                 }
 853         }
 854         if (proc->buffers.next != &buffer->entry) {
 855                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 856                                                 struct binder_buffer, entry);
 857
 858                 if (prev->free) {
 859                         binder_delete_free_buffer(proc, buffer);
 860                         rb_erase(&prev->rb_node, &proc->free_buffers);
 861                         buffer = prev;
 862                 }
 863         }
 864         binder_insert_free_buffer(proc, buffer);
 865 }
 866
 867 static struct binder_node *binder_get_node(struct binder_proc *proc,
 868                                            binder_uintptr_t ptr)
 869 {
 870         struct rb_node *n = proc->nodes.rb_node;
 871         struct binder_node *node;
 872
 873         while (n) {
 874                 node = rb_entry(n, struct binder_node, rb_node);
 875
 876                 if (ptr < node->ptr)
 877                         n = n->rb_left;
 878                 else if (ptr > node->ptr)
 879                         n = n->rb_right;
 880                 else
 881                         return node;
 882         }
 883         return NULL;
 884 }
 885
 886 static struct binder_node *binder_new_node(struct binder_proc *proc,
 887                                            binder_uintptr_t ptr,
 888                                            binder_uintptr_t cookie)
 889 {
 890         struct rb_node **p = &proc->nodes.rb_node;
 891         struct rb_node *parent = NULL;
 892         struct binder_node *node;
 893
 894         while (*p) {
 895                 parent = *p;
 896                 node = rb_entry(parent, struct binder_node, rb_node);
 897
 898                 if (ptr < node->ptr)
 899                         p = &(*p)->rb_left;
 900                 else if (ptr > node->ptr)
 901                         p = &(*p)->rb_right;
 902                 else
 903                         return NULL;
 904         }
 905
 906         node = kzalloc(sizeof(*node), GFP_KERNEL);
 907         if (node == NULL)
 908                 return NULL;
 909         binder_stats_created(BINDER_STAT_NODE);
 910         rb_link_node(&node->rb_node, parent, p);
 911         rb_insert_color(&node->rb_node, &proc->nodes);
 912         node->debug_id = ++binder_last_id;
 913         node->proc = proc;
 914         node->ptr = ptr;
 915         node->cookie = cookie;
 916         node->work.type = BINDER_WORK_NODE;
 917         INIT_LIST_HEAD(&node->work.entry);
 918         INIT_LIST_HEAD(&node->async_todo);
 919         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 920                      "%d:%d node %d u%016llx c%016llx created\n",
 921                      proc->pid, current->pid, node->debug_id,
 922                      (u64)node->ptr, (u64)node->cookie);
 923         return node;
 924 }
 925
 926 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 927                            struct list_head *target_list)
 928 {
 929         if (strong) {
 930                 if (internal) {
 931                         if (target_list == NULL &&
 932                             node->internal_strong_refs == 0 &&
 933                             !(node == binder_context_mgr_node &&
 934                             node->has_strong_ref)) {
 935                                 pr_err("invalid inc strong node for %d\n",
 936                                         node->debug_id);
 937                                 return -EINVAL;
 938                         }
 939                         node->internal_strong_refs++;
 940                 } else
 941                         node->local_strong_refs++;
 942                 if (!node->has_strong_ref && target_list) {
 943                         list_del_init(&node->work.entry);
 944                         list_add_tail(&node->work.entry, target_list);
 945                 }
 946         } else {
 947                 if (!internal)
 948                         node->local_weak_refs++;
 949                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 950                         if (target_list == NULL) {
 951                                 pr_err("invalid inc weak node for %d\n",
 952                                         node->debug_id);
 953                                 return -EINVAL;
 954                         }
 955                         list_add_tail(&node->work.entry, target_list);
 956                 }
 957         }
 958         return 0;
 959 }
 960
 961 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 962 {
 963         if (strong) {
 964                 if (internal)
 965                         node->internal_strong_refs--;
 966                 else
 967                         node->local_strong_refs--;
 968                 if (node->local_strong_refs || node->internal_strong_refs)
 969                         return 0;
 970         } else {
 971                 if (!internal)
 972                         node->local_weak_refs--;
 973                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 974                         return 0;
 975         }
 976         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 977                 if (list_empty(&node->work.entry)) {
 978                         list_add_tail(&node->work.entry, &node->proc->todo);
 979                         wake_up_interruptible(&node->proc->wait);
 980                 }
 981         } else {
 982                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 983                     !node->local_weak_refs) {
 984                         list_del_init(&node->work.entry);
 985                         if (node->proc) {
 986                                 rb_erase(&node->rb_node, &node->proc->nodes);
 987                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 988                                              "refless node %d deleted\n",
 989                                              node->debug_id);
 990                         } else {
 991                                 hlist_del(&node->dead_node);
 992                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 993                                              "dead node %d deleted\n",
 994                                              node->debug_id);
 995                         }
 996                         kfree(node);
 997                         binder_stats_deleted(BINDER_STAT_NODE);
 998                 }
 999         }
1000
1001         return 0;
1002 }
1003
1004
1005 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1006                                          u32 desc, bool need_strong_ref)
1007 {
1008         struct rb_node *n = proc->refs_by_desc.rb_node;
1009         struct binder_ref *ref;
1010
1011         while (n) {
1012                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1013
1014                 if (desc < ref->desc) {
1015                         n = n->rb_left;
1016                 } else if (desc > ref->desc) {
1017                         n = n->rb_right;
1018                 } else if (need_strong_ref && !ref->strong) {
1019                         binder_user_error("tried to use weak ref as strong ref\n");
1020                         return NULL;
1021                 } else {
1022                         return ref;
1023                 }
1024         }
1025         return NULL;
1026 }
1027
1028 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1029                                                   struct binder_node *node)
1030 {
1031         struct rb_node *n;
1032         struct rb_node **p = &proc->refs_by_node.rb_node;
1033         struct rb_node *parent = NULL;
1034         struct binder_ref *ref, *new_ref;
1035
1036         while (*p) {
1037                 parent = *p;
1038                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1039
1040                 if (node < ref->node)
1041                         p = &(*p)->rb_left;
1042                 else if (node > ref->node)
1043                         p = &(*p)->rb_right;
1044                 else
1045                         return ref;
1046         }
1047         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1048         if (new_ref == NULL)
1049                 return NULL;
1050         binder_stats_created(BINDER_STAT_REF);
1051         new_ref->debug_id = ++binder_last_id;
1052         new_ref->proc = proc;
1053         new_ref->node = node;
1054         rb_link_node(&new_ref->rb_node_node, parent, p);
1055         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1056
1057         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1058         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1059                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1060                 if (ref->desc > new_ref->desc)
1061                         break;
1062                 new_ref->desc = ref->desc + 1;
1063         }
1064
1065         p = &proc->refs_by_desc.rb_node;
1066         while (*p) {
1067                 parent = *p;
1068                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1069
1070                 if (new_ref->desc < ref->desc)
1071                         p = &(*p)->rb_left;
1072                 else if (new_ref->desc > ref->desc)
1073                         p = &(*p)->rb_right;
1074                 else
1075                         BUG();
1076         }
1077         rb_link_node(&new_ref->rb_node_desc, parent, p);
1078         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1079         if (node) {
1080                 hlist_add_head(&new_ref->node_entry, &node->refs);
1081
1082                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1083                              "%d new ref %d desc %d for node %d\n",
1084                               proc->pid, new_ref->debug_id, new_ref->desc,
1085                               node->debug_id);
1086         } else {
1087                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1088                              "%d new ref %d desc %d for dead node\n",
1089                               proc->pid, new_ref->debug_id, new_ref->desc);
1090         }
1091         return new_ref;
1092 }
1093
1094 static void binder_delete_ref(struct binder_ref *ref)
1095 {
1096         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1097                      "%d delete ref %d desc %d for node %d\n",
1098                       ref->proc->pid, ref->debug_id, ref->desc,
1099                       ref->node->debug_id);
1100
1101         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1102         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1103         if (ref->strong)
1104                 binder_dec_node(ref->node, 1, 1);
1105         hlist_del(&ref->node_entry);
1106         binder_dec_node(ref->node, 0, 1);
1107         if (ref->death) {
1108                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1109                              "%d delete ref %d desc %d has death notification\n",
1110                               ref->proc->pid, ref->debug_id, ref->desc);
1111                 list_del(&ref->death->work.entry);
1112                 kfree(ref->death);
1113                 binder_stats_deleted(BINDER_STAT_DEATH);
1114         }
1115         kfree(ref);
1116         binder_stats_deleted(BINDER_STAT_REF);
1117 }
1118
1119 static int binder_inc_ref(struct binder_ref *ref, int strong,
1120                           struct list_head *target_list)
1121 {
1122         int ret;
1123
1124         if (strong) {
1125                 if (ref->strong == 0) {
1126                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1127                         if (ret)
1128                                 return ret;
1129                 }
1130                 ref->strong++;
1131         } else {
1132                 if (ref->weak == 0) {
1133                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1134                         if (ret)
1135                                 return ret;
1136                 }
1137                 ref->weak++;
1138         }
1139         return 0;
1140 }
1141
1142
1143 static int binder_dec_ref(struct binder_ref *ref, int strong)
1144 {
1145         if (strong) {
1146                 if (ref->strong == 0) {
1147                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1148                                           ref->proc->pid, ref->debug_id,
1149                                           ref->desc, ref->strong, ref->weak);
1150                         return -EINVAL;
1151                 }
1152                 ref->strong--;
1153                 if (ref->strong == 0) {
1154                         int ret;
1155
1156                         ret = binder_dec_node(ref->node, strong, 1);
1157                         if (ret)
1158                                 return ret;
1159                 }
1160         } else {
1161                 if (ref->weak == 0) {
1162                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1163                                           ref->proc->pid, ref->debug_id,
1164                                           ref->desc, ref->strong, ref->weak);
1165                         return -EINVAL;
1166                 }
1167                 ref->weak--;
1168         }
1169         if (ref->strong == 0 && ref->weak == 0)
1170                 binder_delete_ref(ref);
1171         return 0;
1172 }
1173
1174 static void binder_pop_transaction(struct binder_thread *target_thread,
1175                                    struct binder_transaction *t)
1176 {
1177         if (target_thread) {
1178                 BUG_ON(target_thread->transaction_stack != t);
1179                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1180                 target_thread->transaction_stack =
1181                         target_thread->transaction_stack->from_parent;
1182                 t->from = NULL;
1183         }
1184         t->need_reply = 0;
1185         if (t->buffer)
1186                 t->buffer->transaction = NULL;
1187         kfree(t);
1188         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1189 }
1190
1191 static void binder_send_failed_reply(struct binder_transaction *t,
1192                                      uint32_t error_code)
1193 {
1194         struct binder_thread *target_thread;
1195         struct binder_transaction *next;
1196
1197         BUG_ON(t->flags & TF_ONE_WAY);
1198         while (1) {
1199                 target_thread = t->from;
1200                 if (target_thread) {
1201                         if (target_thread->return_error != BR_OK &&
1202                            target_thread->return_error2 == BR_OK) {
1203                                 target_thread->return_error2 =
1204                                         target_thread->return_error;
1205                                 target_thread->return_error = BR_OK;
1206                         }
1207                         if (target_thread->return_error == BR_OK) {
1208                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1209                                              "send failed reply for transaction %d to %d:%d\n",
1210                                               t->debug_id,
1211                                               target_thread->proc->pid,
1212                                               target_thread->pid);
1213
1214                                 binder_pop_transaction(target_thread, t);
1215                                 target_thread->return_error = error_code;
1216                                 wake_up_interruptible(&target_thread->wait);
1217                         } else {
1218                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1219                                         target_thread->proc->pid,
1220                                         target_thread->pid,
1221                                         target_thread->return_error);
1222                         }
1223                         return;
1224                 }
1225                 next = t->from_parent;
1226
1227                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1228                              "send failed reply for transaction %d, target dead\n",
1229                              t->debug_id);
1230
1231                 binder_pop_transaction(target_thread, t);
1232                 if (next == NULL) {
1233                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1234                                      "reply failed, no target thread at root\n");
1235                         return;
1236                 }
1237                 t = next;
1238                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1239                              "reply failed, no target thread -- retry %d\n",
1240                               t->debug_id);
1241         }
1242 }
1243
1244 static void binder_transaction_buffer_release(struct binder_proc *proc,
1245                                               struct binder_buffer *buffer,
1246                                               binder_size_t *failed_at)
1247 {
1248         binder_size_t *offp, *off_end;
1249         int debug_id = buffer->debug_id;
1250
1251         binder_debug(BINDER_DEBUG_TRANSACTION,
1252                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1253                      proc->pid, buffer->debug_id,
1254                      buffer->data_size, buffer->offsets_size, failed_at);
1255
1256         if (buffer->target_node)
1257                 binder_dec_node(buffer->target_node, 1, 0);
1258
1259         offp = (binder_size_t *)(buffer->data +
1260                                  ALIGN(buffer->data_size, sizeof(void *)));
1261         if (failed_at)
1262                 off_end = failed_at;
1263         else
1264                 off_end = (void *)offp + buffer->offsets_size;
1265         for (; offp < off_end; offp++) {
1266                 struct flat_binder_object *fp;
1267
1268                 if (*offp > buffer->data_size - sizeof(*fp) ||
1269                     buffer->data_size < sizeof(*fp) ||
1270                     !IS_ALIGNED(*offp, sizeof(u32))) {
1271                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1272                                debug_id, (u64)*offp, buffer->data_size);
1273                         continue;
1274                 }
1275                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1276                 switch (fp->type) {
1277                 case BINDER_TYPE_BINDER:
1278                 case BINDER_TYPE_WEAK_BINDER: {
1279                         struct binder_node *node = binder_get_node(proc, fp->binder);
1280
1281                         if (node == NULL) {
1282                                 pr_err("transaction release %d bad node %016llx\n",
1283                                        debug_id, (u64)fp->binder);
1284                                 break;
1285                         }
1286                         binder_debug(BINDER_DEBUG_TRANSACTION,
1287                                      "        node %d u%016llx\n",
1288                                      node->debug_id, (u64)node->ptr);
1289                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1290                 } break;
1291                 case BINDER_TYPE_HANDLE:
1292                 case BINDER_TYPE_WEAK_HANDLE: {
1293                         struct binder_ref *ref;
1294
1295                         ref = binder_get_ref(proc, fp->handle,
1296                                              fp->type == BINDER_TYPE_HANDLE);
1297
1298                         if (ref == NULL) {
1299                                 pr_err("transaction release %d bad handle %d\n",
1300                                  debug_id, fp->handle);
1301                                 break;
1302                         }
1303                         binder_debug(BINDER_DEBUG_TRANSACTION,
1304                                      "        ref %d desc %d (node %d)\n",
1305                                      ref->debug_id, ref->desc, ref->node->debug_id);
1306                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1307                 } break;
1308
1309                 case BINDER_TYPE_FD:
1310                         binder_debug(BINDER_DEBUG_TRANSACTION,
1311                                      "        fd %d\n", fp->handle);
1312                         if (failed_at)
1313                                 task_close_fd(proc, fp->handle);
1314                         break;
1315
1316                 default:
1317                         pr_err("transaction release %d bad object type %x\n",
1318                                 debug_id, fp->type);
1319                         break;
1320                 }
1321         }
1322 }
1323
1324 static void binder_transaction(struct binder_proc *proc,
1325                                struct binder_thread *thread,
1326                                struct binder_transaction_data *tr, int reply)
1327 {
1328         struct binder_transaction *t;
1329         struct binder_work *tcomplete;
1330         binder_size_t *offp, *off_end;
1331         struct binder_proc *target_proc;
1332         struct binder_thread *target_thread = NULL;
1333         struct binder_node *target_node = NULL;
1334         struct list_head *target_list;
1335         wait_queue_head_t *target_wait;
1336         struct binder_transaction *in_reply_to = NULL;
1337         struct binder_transaction_log_entry *e;
1338         uint32_t return_error;
1339
1340         e = binder_transaction_log_add(&binder_transaction_log);
1341         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1342         e->from_proc = proc->pid;
1343         e->from_thread = thread->pid;
1344         e->target_handle = tr->target.handle;
1345         e->data_size = tr->data_size;
1346         e->offsets_size = tr->offsets_size;
1347
1348         if (reply) {
1349                 in_reply_to = thread->transaction_stack;
1350                 if (in_reply_to == NULL) {
1351                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1352                                           proc->pid, thread->pid);
1353                         return_error = BR_FAILED_REPLY;
1354                         goto err_empty_call_stack;
1355                 }
1356                 binder_set_nice(in_reply_to->saved_priority);
1357                 if (in_reply_to->to_thread != thread) {
1358                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1359                                 proc->pid, thread->pid, in_reply_to->debug_id,
1360                                 in_reply_to->to_proc ?
1361                                 in_reply_to->to_proc->pid : 0,
1362                                 in_reply_to->to_thread ?
1363                                 in_reply_to->to_thread->pid : 0);
1364                         return_error = BR_FAILED_REPLY;
1365                         in_reply_to = NULL;
1366                         goto err_bad_call_stack;
1367                 }
1368                 thread->transaction_stack = in_reply_to->to_parent;
1369                 target_thread = in_reply_to->from;
1370                 if (target_thread == NULL) {
1371                         return_error = BR_DEAD_REPLY;
1372                         goto err_dead_binder;
1373                 }
1374                 if (target_thread->transaction_stack != in_reply_to) {
1375                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1376                                 proc->pid, thread->pid,
1377                                 target_thread->transaction_stack ?
1378                                 target_thread->transaction_stack->debug_id : 0,
1379                                 in_reply_to->debug_id);
1380                         return_error = BR_FAILED_REPLY;
1381                         in_reply_to = NULL;
1382                         target_thread = NULL;
1383                         goto err_dead_binder;
1384                 }
1385                 target_proc = target_thread->proc;
1386         } else {
1387                 if (tr->target.handle) {
1388                         struct binder_ref *ref;
1389
1390                         ref = binder_get_ref(proc, tr->target.handle, true);
1391                         if (ref == NULL) {
1392                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1393                                         proc->pid, thread->pid);
1394                                 return_error = BR_FAILED_REPLY;
1395                                 goto err_invalid_target_handle;
1396                         }
1397                         target_node = ref->node;
1398                 } else {
1399                         target_node = binder_context_mgr_node;
1400                         if (target_node == NULL) {
1401                                 return_error = BR_DEAD_REPLY;
1402                                 goto err_no_context_mgr_node;
1403                         }
1404                 }
1405                 e->to_node = target_node->debug_id;
1406                 target_proc = target_node->proc;
1407                 if (target_proc == NULL) {
1408                         return_error = BR_DEAD_REPLY;
1409                         goto err_dead_binder;
1410                 }
1411                 if (security_binder_transaction(proc->tsk,
1412                                                 target_proc->tsk) < 0) {
1413                         return_error = BR_FAILED_REPLY;
1414                         goto err_invalid_target_handle;
1415                 }
1416                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1417                         struct binder_transaction *tmp;
1418
1419                         tmp = thread->transaction_stack;
1420                         if (tmp->to_thread != thread) {
1421                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1422                                         proc->pid, thread->pid, tmp->debug_id,
1423                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1424                                         tmp->to_thread ?
1425                                         tmp->to_thread->pid : 0);
1426                                 return_error = BR_FAILED_REPLY;
1427                                 goto err_bad_call_stack;
1428                         }
1429                         while (tmp) {
1430                                 if (tmp->from && tmp->from->proc == target_proc)
1431                                         target_thread = tmp->from;
1432                                 tmp = tmp->from_parent;
1433                         }
1434                 }
1435         }
1436         if (target_thread) {
1437                 e->to_thread = target_thread->pid;
1438                 target_list = &target_thread->todo;
1439                 target_wait = &target_thread->wait;
1440         } else {
1441                 target_list = &target_proc->todo;
1442                 target_wait = &target_proc->wait;
1443         }
1444         e->to_proc = target_proc->pid;
1445
1446         /* TODO: reuse incoming transaction for reply */
1447         t = kzalloc(sizeof(*t), GFP_KERNEL);
1448         if (t == NULL) {
1449                 return_error = BR_FAILED_REPLY;
1450                 goto err_alloc_t_failed;
1451         }
1452         binder_stats_created(BINDER_STAT_TRANSACTION);
1453
1454         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1455         if (tcomplete == NULL) {
1456                 return_error = BR_FAILED_REPLY;
1457                 goto err_alloc_tcomplete_failed;
1458         }
1459         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1460
1461         t->debug_id = ++binder_last_id;
1462         e->debug_id = t->debug_id;
1463
1464         if (reply)
1465                 binder_debug(BINDER_DEBUG_TRANSACTION,
1466                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1467                              proc->pid, thread->pid, t->debug_id,
1468                              target_proc->pid, target_thread->pid,
1469                              (u64)tr->data.ptr.buffer,
1470                              (u64)tr->data.ptr.offsets,
1471                              (u64)tr->data_size, (u64)tr->offsets_size);
1472         else
1473                 binder_debug(BINDER_DEBUG_TRANSACTION,
1474                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1475                              proc->pid, thread->pid, t->debug_id,
1476                              target_proc->pid, target_node->debug_id,
1477                              (u64)tr->data.ptr.buffer,
1478                              (u64)tr->data.ptr.offsets,
1479                              (u64)tr->data_size, (u64)tr->offsets_size);
1480
1481         if (!reply && !(tr->flags & TF_ONE_WAY))
1482                 t->from = thread;
1483         else
1484                 t->from = NULL;
1485         t->sender_euid = task_euid(proc->tsk);
1486         t->to_proc = target_proc;
1487         t->to_thread = target_thread;
1488         t->code = tr->code;
1489         t->flags = tr->flags;
1490         t->priority = task_nice(current);
1491
1492         trace_binder_transaction(reply, t, target_node);
1493
1494         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1495                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1496         if (t->buffer == NULL) {
1497                 return_error = BR_FAILED_REPLY;
1498                 goto err_binder_alloc_buf_failed;
1499         }
1500         t->buffer->allow_user_free = 0;
1501         t->buffer->debug_id = t->debug_id;
1502         t->buffer->transaction = t;
1503         t->buffer->target_node = target_node;
1504         trace_binder_transaction_alloc_buf(t->buffer);
1505         if (target_node)
1506                 binder_inc_node(target_node, 1, 0, NULL);
1507
1508         offp = (binder_size_t *)(t->buffer->data +
1509                                  ALIGN(tr->data_size, sizeof(void *)));
1510
1511         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1512                            tr->data.ptr.buffer, tr->data_size)) {
1513                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1514                                 proc->pid, thread->pid);
1515                 return_error = BR_FAILED_REPLY;
1516                 goto err_copy_data_failed;
1517         }
1518         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1519                            tr->data.ptr.offsets, tr->offsets_size)) {
1520                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1521                                 proc->pid, thread->pid);
1522                 return_error = BR_FAILED_REPLY;
1523                 goto err_copy_data_failed;
1524         }
1525         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1526                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1527                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1528                 return_error = BR_FAILED_REPLY;
1529                 goto err_bad_offset;
1530         }
1531         off_end = (void *)offp + tr->offsets_size;
1532         for (; offp < off_end; offp++) {
1533                 struct flat_binder_object *fp;
1534
1535                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1536                     t->buffer->data_size < sizeof(*fp) ||
1537                     !IS_ALIGNED(*offp, sizeof(u32))) {
1538                         binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
1539                                           proc->pid, thread->pid, (u64)*offp);
1540                         return_error = BR_FAILED_REPLY;
1541                         goto err_bad_offset;
1542                 }
1543                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1544                 switch (fp->type) {
1545                 case BINDER_TYPE_BINDER:
1546                 case BINDER_TYPE_WEAK_BINDER: {
1547                         struct binder_ref *ref;
1548                         struct binder_node *node = binder_get_node(proc, fp->binder);
1549
1550                         if (node == NULL) {
1551                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1552                                 if (node == NULL) {
1553                                         return_error = BR_FAILED_REPLY;
1554                                         goto err_binder_new_node_failed;
1555                                 }
1556                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1557                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1558                         }
1559                         if (fp->cookie != node->cookie) {
1560                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1561                                         proc->pid, thread->pid,
1562                                         (u64)fp->binder, node->debug_id,
1563                                         (u64)fp->cookie, (u64)node->cookie);
1564                                 return_error = BR_FAILED_REPLY;
1565                                 goto err_binder_get_ref_for_node_failed;
1566                         }
1567                         if (security_binder_transfer_binder(proc->tsk,
1568                                                             target_proc->tsk)) {
1569                                 return_error = BR_FAILED_REPLY;
1570                                 goto err_binder_get_ref_for_node_failed;
1571                         }
1572                         ref = binder_get_ref_for_node(target_proc, node);
1573                         if (ref == NULL) {
1574                                 return_error = BR_FAILED_REPLY;
1575                                 goto err_binder_get_ref_for_node_failed;
1576                         }
1577                         if (fp->type == BINDER_TYPE_BINDER)
1578                                 fp->type = BINDER_TYPE_HANDLE;
1579                         else
1580                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1581                         fp->binder = 0;
1582                         fp->handle = ref->desc;
1583                         fp->cookie = 0;
1584                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1585                                        &thread->todo);
1586
1587                         trace_binder_transaction_node_to_ref(t, node, ref);
1588                         binder_debug(BINDER_DEBUG_TRANSACTION,
1589                                      "        node %d u%016llx -> ref %d desc %d\n",
1590                                      node->debug_id, (u64)node->ptr,
1591                                      ref->debug_id, ref->desc);
1592                 } break;
1593                 case BINDER_TYPE_HANDLE:
1594                 case BINDER_TYPE_WEAK_HANDLE: {
1595                         struct binder_ref *ref;
1596
1597                         ref = binder_get_ref(proc, fp->handle,
1598                                              fp->type == BINDER_TYPE_HANDLE);
1599
1600                         if (ref == NULL) {
1601                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1602                                                 proc->pid,
1603                                                 thread->pid, fp->handle);
1604                                 return_error = BR_FAILED_REPLY;
1605                                 goto err_binder_get_ref_failed;
1606                         }
1607                         if (security_binder_transfer_binder(proc->tsk,
1608                                                             target_proc->tsk)) {
1609                                 return_error = BR_FAILED_REPLY;
1610                                 goto err_binder_get_ref_failed;
1611                         }
1612                         if (ref->node->proc == target_proc) {
1613                                 if (fp->type == BINDER_TYPE_HANDLE)
1614                                         fp->type = BINDER_TYPE_BINDER;
1615                                 else
1616                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1617                                 fp->binder = ref->node->ptr;
1618                                 fp->cookie = ref->node->cookie;
1619                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1620                                 trace_binder_transaction_ref_to_node(t, ref);
1621                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1622                                              "        ref %d desc %d -> node %d u%016llx\n",
1623                                              ref->debug_id, ref->desc, ref->node->debug_id,
1624                                              (u64)ref->node->ptr);
1625                         } else {
1626                                 struct binder_ref *new_ref;
1627
1628                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1629                                 if (new_ref == NULL) {
1630                                         return_error = BR_FAILED_REPLY;
1631                                         goto err_binder_get_ref_for_node_failed;
1632                                 }
1633                                 fp->binder = 0;
1634                                 fp->handle = new_ref->desc;
1635                                 fp->cookie = 0;
1636                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1637                                 trace_binder_transaction_ref_to_ref(t, ref,
1638                                                                     new_ref);
1639                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1640                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1641                                              ref->debug_id, ref->desc, new_ref->debug_id,
1642                                              new_ref->desc, ref->node->debug_id);
1643                         }
1644                 } break;
1645
1646                 case BINDER_TYPE_FD: {
1647                         int target_fd;
1648                         struct file *file;
1649
1650                         if (reply) {
1651                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1652                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1653                                                 proc->pid, thread->pid, fp->handle);
1654                                         return_error = BR_FAILED_REPLY;
1655                                         goto err_fd_not_allowed;
1656                                 }
1657                         } else if (!target_node->accept_fds) {
1658                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1659                                         proc->pid, thread->pid, fp->handle);
1660                                 return_error = BR_FAILED_REPLY;
1661                                 goto err_fd_not_allowed;
1662                         }
1663
1664                         file = fget(fp->handle);
1665                         if (file == NULL) {
1666                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1667                                         proc->pid, thread->pid, fp->handle);
1668                                 return_error = BR_FAILED_REPLY;
1669                                 goto err_fget_failed;
1670                         }
1671                         if (security_binder_transfer_file(proc->tsk,
1672                                                           target_proc->tsk,
1673                                                           file) < 0) {
1674                                 fput(file);
1675                                 return_error = BR_FAILED_REPLY;
1676                                 goto err_get_unused_fd_failed;
1677                         }
1678                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1679                         if (target_fd < 0) {
1680                                 fput(file);
1681                                 return_error = BR_FAILED_REPLY;
1682                                 goto err_get_unused_fd_failed;
1683                         }
1684                         task_fd_install(target_proc, target_fd, file);
1685                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1686                         binder_debug(BINDER_DEBUG_TRANSACTION,
1687                                      "        fd %d -> %d\n", fp->handle, target_fd);
1688                         /* TODO: fput? */
1689                         fp->binder = 0;
1690                         fp->handle = target_fd;
1691                 } break;
1692
1693                 default:
1694                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1695                                 proc->pid, thread->pid, fp->type);
1696                         return_error = BR_FAILED_REPLY;
1697                         goto err_bad_object_type;
1698                 }
1699         }
1700         if (reply) {
1701                 BUG_ON(t->buffer->async_transaction != 0);
1702                 binder_pop_transaction(target_thread, in_reply_to);
1703         } else if (!(t->flags & TF_ONE_WAY)) {
1704                 BUG_ON(t->buffer->async_transaction != 0);
1705                 t->need_reply = 1;
1706                 t->from_parent = thread->transaction_stack;
1707                 thread->transaction_stack = t;
1708         } else {
1709                 BUG_ON(target_node == NULL);
1710                 BUG_ON(t->buffer->async_transaction != 1);
1711                 if (target_node->has_async_transaction) {
1712                         target_list = &target_node->async_todo;
1713                         target_wait = NULL;
1714                 } else
1715                         target_node->has_async_transaction = 1;
1716         }
1717         t->work.type = BINDER_WORK_TRANSACTION;
1718         list_add_tail(&t->work.entry, target_list);
1719         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1720         list_add_tail(&tcomplete->entry, &thread->todo);
1721         if (target_wait)
1722                 wake_up_interruptible(target_wait);
1723         return;
1724
1725 err_get_unused_fd_failed:
1726 err_fget_failed:
1727 err_fd_not_allowed:
1728 err_binder_get_ref_for_node_failed:
1729 err_binder_get_ref_failed:
1730 err_binder_new_node_failed:
1731 err_bad_object_type:
1732 err_bad_offset:
1733 err_copy_data_failed:
1734         trace_binder_transaction_failed_buffer_release(t->buffer);
1735         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1736         t->buffer->transaction = NULL;
1737         binder_free_buf(target_proc, t->buffer);
1738 err_binder_alloc_buf_failed:
1739         kfree(tcomplete);
1740         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1741 err_alloc_tcomplete_failed:
1742         kfree(t);
1743         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1744 err_alloc_t_failed:
1745 err_bad_call_stack:
1746 err_empty_call_stack:
1747 err_dead_binder:
1748 err_invalid_target_handle:
1749 err_no_context_mgr_node:
1750         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1751                      "%d:%d transaction failed %d, size %lld-%lld\n",
1752                      proc->pid, thread->pid, return_error,
1753                      (u64)tr->data_size, (u64)tr->offsets_size);
1754
1755         {
1756                 struct binder_transaction_log_entry *fe;
1757
1758                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1759                 *fe = *e;
1760         }
1761
1762         BUG_ON(thread->return_error != BR_OK);
1763         if (in_reply_to) {
1764                 thread->return_error = BR_TRANSACTION_COMPLETE;
1765                 binder_send_failed_reply(in_reply_to, return_error);
1766         } else
1767                 thread->return_error = return_error;
1768 }
1769
1770 static int binder_thread_write(struct binder_proc *proc,
1771                         struct binder_thread *thread,
1772                         binder_uintptr_t binder_buffer, size_t size,
1773                         binder_size_t *consumed)
1774 {
1775         uint32_t cmd;
1776         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1777         void __user *ptr = buffer + *consumed;
1778         void __user *end = buffer + size;
1779
1780         while (ptr < end && thread->return_error == BR_OK) {
1781                 if (get_user(cmd, (uint32_t __user *)ptr))
1782                         return -EFAULT;
1783                 ptr += sizeof(uint32_t);
1784                 trace_binder_command(cmd);
1785                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1786                         binder_stats.bc[_IOC_NR(cmd)]++;
1787                         proc->stats.bc[_IOC_NR(cmd)]++;
1788                         thread->stats.bc[_IOC_NR(cmd)]++;
1789                 }
1790                 switch (cmd) {
1791                 case BC_INCREFS:
1792                 case BC_ACQUIRE:
1793                 case BC_RELEASE:
1794                 case BC_DECREFS: {
1795                         uint32_t target;
1796                         struct binder_ref *ref;
1797                         const char *debug_string;
1798
1799                         if (get_user(target, (uint32_t __user *)ptr))
1800                                 return -EFAULT;
1801                         ptr += sizeof(uint32_t);
1802                         if (target == 0 && binder_context_mgr_node &&
1803                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1804                                 ref = binder_get_ref_for_node(proc,
1805                                                binder_context_mgr_node);
1806                                 if (ref->desc != target) {
1807                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1808                                                 proc->pid, thread->pid,
1809                                                 ref->desc);
1810                                 }
1811                         } else
1812                                 ref = binder_get_ref(proc, target,
1813                                                      cmd == BC_ACQUIRE ||
1814                                                      cmd == BC_RELEASE);
1815                         if (ref == NULL) {
1816                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1817                                         proc->pid, thread->pid, target);
1818                                 break;
1819                         }
1820                         switch (cmd) {
1821                         case BC_INCREFS:
1822                                 debug_string = "IncRefs";
1823                                 binder_inc_ref(ref, 0, NULL);
1824                                 break;
1825                         case BC_ACQUIRE:
1826                                 debug_string = "Acquire";
1827                                 binder_inc_ref(ref, 1, NULL);
1828                                 break;
1829                         case BC_RELEASE:
1830                                 debug_string = "Release";
1831                                 binder_dec_ref(ref, 1);
1832                                 break;
1833                         case BC_DECREFS:
1834                         default:
1835                                 debug_string = "DecRefs";
1836                                 binder_dec_ref(ref, 0);
1837                                 break;
1838                         }
1839                         binder_debug(BINDER_DEBUG_USER_REFS,
1840                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1841                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1842                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1843                         break;
1844                 }
1845                 case BC_INCREFS_DONE:
1846                 case BC_ACQUIRE_DONE: {
1847                         binder_uintptr_t node_ptr;
1848                         binder_uintptr_t cookie;
1849                         struct binder_node *node;
1850
1851                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1852                                 return -EFAULT;
1853                         ptr += sizeof(binder_uintptr_t);
1854                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1855                                 return -EFAULT;
1856                         ptr += sizeof(binder_uintptr_t);
1857                         node = binder_get_node(proc, node_ptr);
1858                         if (node == NULL) {
1859                                 binder_user_error("%d:%d %s u%016llx no match\n",
1860                                         proc->pid, thread->pid,
1861                                         cmd == BC_INCREFS_DONE ?
1862                                         "BC_INCREFS_DONE" :
1863                                         "BC_ACQUIRE_DONE",
1864                                         (u64)node_ptr);
1865                                 break;
1866                         }
1867                         if (cookie != node->cookie) {
1868                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1869                                         proc->pid, thread->pid,
1870                                         cmd == BC_INCREFS_DONE ?
1871                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1872                                         (u64)node_ptr, node->debug_id,
1873                                         (u64)cookie, (u64)node->cookie);
1874                                 break;
1875                         }
1876                         if (cmd == BC_ACQUIRE_DONE) {
1877                                 if (node->pending_strong_ref == 0) {
1878                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1879                                                 proc->pid, thread->pid,
1880                                                 node->debug_id);
1881                                         break;
1882                                 }
1883                                 node->pending_strong_ref = 0;
1884                         } else {
1885                                 if (node->pending_weak_ref == 0) {
1886                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1887                                                 proc->pid, thread->pid,
1888                                                 node->debug_id);
1889                                         break;
1890                                 }
1891                                 node->pending_weak_ref = 0;
1892                         }
1893                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1894                         binder_debug(BINDER_DEBUG_USER_REFS,
1895                                      "%d:%d %s node %d ls %d lw %d\n",
1896                                      proc->pid, thread->pid,
1897                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1898                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1899                         break;
1900                 }
1901                 case BC_ATTEMPT_ACQUIRE:
1902                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1903                         return -EINVAL;
1904                 case BC_ACQUIRE_RESULT:
1905                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1906                         return -EINVAL;
1907
1908                 case BC_FREE_BUFFER: {
1909                         binder_uintptr_t data_ptr;
1910                         struct binder_buffer *buffer;
1911
1912                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1913                                 return -EFAULT;
1914                         ptr += sizeof(binder_uintptr_t);
1915
1916                         buffer = binder_buffer_lookup(proc, data_ptr);
1917                         if (buffer == NULL) {
1918                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1919                                         proc->pid, thread->pid, (u64)data_ptr);
1920                                 break;
1921                         }
1922                         if (!buffer->allow_user_free) {
1923                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1924                                         proc->pid, thread->pid, (u64)data_ptr);
1925                                 break;
1926                         }
1927                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1928                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1929                                      proc->pid, thread->pid, (u64)data_ptr,
1930                                      buffer->debug_id,
1931                                      buffer->transaction ? "active" : "finished");
1932
1933                         if (buffer->transaction) {
1934                                 buffer->transaction->buffer = NULL;
1935                                 buffer->transaction = NULL;
1936                         }
1937                         if (buffer->async_transaction && buffer->target_node) {
1938                                 BUG_ON(!buffer->target_node->has_async_transaction);
1939                                 if (list_empty(&buffer->target_node->async_todo))
1940                                         buffer->target_node->has_async_transaction = 0;
1941                                 else
1942                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1943                         }
1944                         trace_binder_transaction_buffer_release(buffer);
1945                         binder_transaction_buffer_release(proc, buffer, NULL);
1946                         binder_free_buf(proc, buffer);
1947                         break;
1948                 }
1949
1950                 case BC_TRANSACTION:
1951                 case BC_REPLY: {
1952                         struct binder_transaction_data tr;
1953
1954                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1955                                 return -EFAULT;
1956                         ptr += sizeof(tr);
1957                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1958                         break;
1959                 }
1960
1961                 case BC_REGISTER_LOOPER:
1962                         binder_debug(BINDER_DEBUG_THREADS,
1963                                      "%d:%d BC_REGISTER_LOOPER\n",
1964                                      proc->pid, thread->pid);
1965                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1966                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1967                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1968                                         proc->pid, thread->pid);
1969                         } else if (proc->requested_threads == 0) {
1970                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1971                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1972                                         proc->pid, thread->pid);
1973                         } else {
1974                                 proc->requested_threads--;
1975                                 proc->requested_threads_started++;
1976                         }
1977                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1978                         break;
1979                 case BC_ENTER_LOOPER:
1980                         binder_debug(BINDER_DEBUG_THREADS,
1981                                      "%d:%d BC_ENTER_LOOPER\n",
1982                                      proc->pid, thread->pid);
1983                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1984                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1985                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1986                                         proc->pid, thread->pid);
1987                         }
1988                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1989                         break;
1990                 case BC_EXIT_LOOPER:
1991                         binder_debug(BINDER_DEBUG_THREADS,
1992                                      "%d:%d BC_EXIT_LOOPER\n",
1993                                      proc->pid, thread->pid);
1994                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1995                         break;
1996
1997                 case BC_REQUEST_DEATH_NOTIFICATION:
1998                 case BC_CLEAR_DEATH_NOTIFICATION: {
1999                         uint32_t target;
2000                         binder_uintptr_t cookie;
2001                         struct binder_ref *ref;
2002                         struct binder_ref_death *death;
2003
2004                         if (get_user(target, (uint32_t __user *)ptr))
2005                                 return -EFAULT;
2006                         ptr += sizeof(uint32_t);
2007                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2008                                 return -EFAULT;
2009                         ptr += sizeof(binder_uintptr_t);
2010                         ref = binder_get_ref(proc, target, false);
2011                         if (ref == NULL) {
2012                                 binder_user_error("%d:%d %s invalid ref %d\n",
2013                                         proc->pid, thread->pid,
2014                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2015                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2016                                         "BC_CLEAR_DEATH_NOTIFICATION",
2017                                         target);
2018                                 break;
2019                         }
2020
2021                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2022                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2023                                      proc->pid, thread->pid,
2024                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2025                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2026                                      "BC_CLEAR_DEATH_NOTIFICATION",
2027                                      (u64)cookie, ref->debug_id, ref->desc,
2028                                      ref->strong, ref->weak, ref->node->debug_id);
2029
2030                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2031                                 if (ref->death) {
2032                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2033                                                 proc->pid, thread->pid);
2034                                         break;
2035                                 }
2036                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2037                                 if (death == NULL) {
2038                                         thread->return_error = BR_ERROR;
2039                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2040                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2041                                                      proc->pid, thread->pid);
2042                                         break;
2043                                 }
2044                                 binder_stats_created(BINDER_STAT_DEATH);
2045                                 INIT_LIST_HEAD(&death->work.entry);
2046                                 death->cookie = cookie;
2047                                 ref->death = death;
2048                                 if (ref->node->proc == NULL) {
2049                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2050                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2051                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2052                                         } else {
2053                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2054                                                 wake_up_interruptible(&proc->wait);
2055                                         }
2056                                 }
2057                         } else {
2058                                 if (ref->death == NULL) {
2059                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2060                                                 proc->pid, thread->pid);
2061                                         break;
2062                                 }
2063                                 death = ref->death;
2064                                 if (death->cookie != cookie) {
2065                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2066                                                 proc->pid, thread->pid,
2067                                                 (u64)death->cookie,
2068                                                 (u64)cookie);
2069                                         break;
2070                                 }
2071                                 ref->death = NULL;
2072                                 if (list_empty(&death->work.entry)) {
2073                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2074                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2075                                                 list_add_tail(&death->work.entry, &thread->todo);
2076                                         } else {
2077                                                 list_add_tail(&death->work.entry, &proc->todo);
2078                                                 wake_up_interruptible(&proc->wait);
2079                                         }
2080                                 } else {
2081                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2082                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2083                                 }
2084                         }
2085                 } break;
2086                 case BC_DEAD_BINDER_DONE: {
2087                         struct binder_work *w;
2088                         binder_uintptr_t cookie;
2089                         struct binder_ref_death *death = NULL;
2090
2091                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2092                                 return -EFAULT;
2093
2094                         ptr += sizeof(cookie);
2095                         list_for_each_entry(w, &proc->delivered_death, entry) {
2096                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2097
2098                                 if (tmp_death->cookie == cookie) {
2099                                         death = tmp_death;
2100                                         break;
2101                                 }
2102                         }
2103                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2104                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2105                                      proc->pid, thread->pid, (u64)cookie,
2106                                      death);
2107                         if (death == NULL) {
2108                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2109                                         proc->pid, thread->pid, (u64)cookie);
2110                                 break;
2111                         }
2112
2113                         list_del_init(&death->work.entry);
2114                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2115                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2116                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2117                                         list_add_tail(&death->work.entry, &thread->todo);
2118                                 } else {
2119                                         list_add_tail(&death->work.entry, &proc->todo);
2120                                         wake_up_interruptible(&proc->wait);
2121                                 }
2122                         }
2123                 } break;
2124
2125                 default:
2126                         pr_err("%d:%d unknown command %d\n",
2127                                proc->pid, thread->pid, cmd);
2128                         return -EINVAL;
2129                 }
2130                 *consumed = ptr - buffer;
2131         }
2132         return 0;
2133 }
2134
2135 static void binder_stat_br(struct binder_proc *proc,
2136                            struct binder_thread *thread, uint32_t cmd)
2137 {
2138         trace_binder_return(cmd);
2139         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2140                 binder_stats.br[_IOC_NR(cmd)]++;
2141                 proc->stats.br[_IOC_NR(cmd)]++;
2142                 thread->stats.br[_IOC_NR(cmd)]++;
2143         }
2144 }
2145
2146 static int binder_has_proc_work(struct binder_proc *proc,
2147                                 struct binder_thread *thread)
2148 {
2149         return !list_empty(&proc->todo) ||
2150                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2151 }
2152
2153 static int binder_has_thread_work(struct binder_thread *thread)
2154 {
2155         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2156                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2157 }
2158
2159 static int binder_thread_read(struct binder_proc *proc,
2160                               struct binder_thread *thread,
2161                               binder_uintptr_t binder_buffer, size_t size,
2162                               binder_size_t *consumed, int non_block)
2163 {
2164         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2165         void __user *ptr = buffer + *consumed;
2166         void __user *end = buffer + size;
2167
2168         int ret = 0;
2169         int wait_for_proc_work;
2170
2171         if (*consumed == 0) {
2172                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2173                         return -EFAULT;
2174                 ptr += sizeof(uint32_t);
2175         }
2176
2177 retry:
2178         wait_for_proc_work = thread->transaction_stack == NULL &&
2179                                 list_empty(&thread->todo);
2180
2181         if (thread->return_error != BR_OK && ptr < end) {
2182                 if (thread->return_error2 != BR_OK) {
2183                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2184                                 return -EFAULT;
2185                         ptr += sizeof(uint32_t);
2186                         binder_stat_br(proc, thread, thread->return_error2);
2187                         if (ptr == end)
2188                                 goto done;
2189                         thread->return_error2 = BR_OK;
2190                 }
2191                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2192                         return -EFAULT;
2193                 ptr += sizeof(uint32_t);
2194                 binder_stat_br(proc, thread, thread->return_error);
2195                 thread->return_error = BR_OK;
2196                 goto done;
2197         }
2198
2199
2200         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2201         if (wait_for_proc_work)
2202                 proc->ready_threads++;
2203
2204         binder_unlock(__func__);
2205
2206         trace_binder_wait_for_work(wait_for_proc_work,
2207                                    !!thread->transaction_stack,
2208                                    !list_empty(&thread->todo));
2209         if (wait_for_proc_work) {
2210                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2211                                         BINDER_LOOPER_STATE_ENTERED))) {
2212                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2213                                 proc->pid, thread->pid, thread->looper);
2214                         wait_event_interruptible(binder_user_error_wait,
2215                                                  binder_stop_on_user_error < 2);
2216                 }
2217                 binder_set_nice(proc->default_priority);
2218                 if (non_block) {
2219                         if (!binder_has_proc_work(proc, thread))
2220                                 ret = -EAGAIN;
2221                 } else
2222                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2223         } else {
2224                 if (non_block) {
2225                         if (!binder_has_thread_work(thread))
2226                                 ret = -EAGAIN;
2227                 } else
2228                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2229         }
2230
2231         binder_lock(__func__);
2232
2233         if (wait_for_proc_work)
2234                 proc->ready_threads--;
2235         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2236
2237         if (ret)
2238                 return ret;
2239
2240         while (1) {
2241                 uint32_t cmd;
2242                 struct binder_transaction_data tr;
2243                 struct binder_work *w;
2244                 struct binder_transaction *t = NULL;
2245
2246                 if (!list_empty(&thread->todo)) {
2247                         w = list_first_entry(&thread->todo, struct binder_work,
2248                                              entry);
2249                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2250                         w = list_first_entry(&proc->todo, struct binder_work,
2251                                              entry);
2252                 } else {
2253                         /* no data added */
2254                         if (ptr - buffer == 4 &&
2255                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2256                                 goto retry;
2257                         break;
2258                 }
2259
2260                 if (end - ptr < sizeof(tr) + 4)
2261                         break;
2262
2263                 switch (w->type) {
2264                 case BINDER_WORK_TRANSACTION: {
2265                         t = container_of(w, struct binder_transaction, work);
2266                 } break;
2267                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2268                         cmd = BR_TRANSACTION_COMPLETE;
2269                         if (put_user(cmd, (uint32_t __user *)ptr))
2270                                 return -EFAULT;
2271                         ptr += sizeof(uint32_t);
2272
2273                         binder_stat_br(proc, thread, cmd);
2274                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2275                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2276                                      proc->pid, thread->pid);
2277
2278                         list_del(&w->entry);
2279                         kfree(w);
2280                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2281                 } break;
2282                 case BINDER_WORK_NODE: {
2283                         struct binder_node *node = container_of(w, struct binder_node, work);
2284                         uint32_t cmd = BR_NOOP;
2285                         const char *cmd_name;
2286                         int strong = node->internal_strong_refs || node->local_strong_refs;
2287                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2288
2289                         if (weak && !node->has_weak_ref) {
2290                                 cmd = BR_INCREFS;
2291                                 cmd_name = "BR_INCREFS";
2292                                 node->has_weak_ref = 1;
2293                                 node->pending_weak_ref = 1;
2294                                 node->local_weak_refs++;
2295                         } else if (strong && !node->has_strong_ref) {
2296                                 cmd = BR_ACQUIRE;
2297                                 cmd_name = "BR_ACQUIRE";
2298                                 node->has_strong_ref = 1;
2299                                 node->pending_strong_ref = 1;
2300                                 node->local_strong_refs++;
2301                         } else if (!strong && node->has_strong_ref) {
2302                                 cmd = BR_RELEASE;
2303                                 cmd_name = "BR_RELEASE";
2304                                 node->has_strong_ref = 0;
2305                         } else if (!weak && node->has_weak_ref) {
2306                                 cmd = BR_DECREFS;
2307                                 cmd_name = "BR_DECREFS";
2308                                 node->has_weak_ref = 0;
2309                         }
2310                         if (cmd != BR_NOOP) {
2311                                 if (put_user(cmd, (uint32_t __user *)ptr))
2312                                         return -EFAULT;
2313                                 ptr += sizeof(uint32_t);
2314                                 if (put_user(node->ptr,
2315                                              (binder_uintptr_t __user *)ptr))
2316                                         return -EFAULT;
2317                                 ptr += sizeof(binder_uintptr_t);
2318                                 if (put_user(node->cookie,
2319                                              (binder_uintptr_t __user *)ptr))
2320                                         return -EFAULT;
2321                                 ptr += sizeof(binder_uintptr_t);
2322
2323                                 binder_stat_br(proc, thread, cmd);
2324                                 binder_debug(BINDER_DEBUG_USER_REFS,
2325                                              "%d:%d %s %d u%016llx c%016llx\n",
2326                                              proc->pid, thread->pid, cmd_name,
2327                                              node->debug_id,
2328                                              (u64)node->ptr, (u64)node->cookie);
2329                         } else {
2330                                 list_del_init(&w->entry);
2331                                 if (!weak && !strong) {
2332                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2333                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2334                                                      proc->pid, thread->pid,
2335                                                      node->debug_id,
2336                                                      (u64)node->ptr,
2337                                                      (u64)node->cookie);
2338                                         rb_erase(&node->rb_node, &proc->nodes);
2339                                         kfree(node);
2340                                         binder_stats_deleted(BINDER_STAT_NODE);
2341                                 } else {
2342                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2343                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2344                                                      proc->pid, thread->pid,
2345                                                      node->debug_id,
2346                                                      (u64)node->ptr,
2347                                                      (u64)node->cookie);
2348                                 }
2349                         }
2350                 } break;
2351                 case BINDER_WORK_DEAD_BINDER:
2352                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2353                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2354                         struct binder_ref_death *death;
2355                         uint32_t cmd;
2356
2357                         death = container_of(w, struct binder_ref_death, work);
2358                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2359                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2360                         else
2361                                 cmd = BR_DEAD_BINDER;
2362                         if (put_user(cmd, (uint32_t __user *)ptr))
2363                                 return -EFAULT;
2364                         ptr += sizeof(uint32_t);
2365                         if (put_user(death->cookie,
2366                                      (binder_uintptr_t __user *)ptr))
2367                                 return -EFAULT;
2368                         ptr += sizeof(binder_uintptr_t);
2369                         binder_stat_br(proc, thread, cmd);
2370                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2371                                      "%d:%d %s %016llx\n",
2372                                       proc->pid, thread->pid,
2373                                       cmd == BR_DEAD_BINDER ?
2374                                       "BR_DEAD_BINDER" :
2375                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2376                                       (u64)death->cookie);
2377
2378                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2379                                 list_del(&w->entry);
2380                                 kfree(death);
2381                                 binder_stats_deleted(BINDER_STAT_DEATH);
2382                         } else
2383                                 list_move(&w->entry, &proc->delivered_death);
2384                         if (cmd == BR_DEAD_BINDER)
2385                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2386                 } break;
2387                 }
2388
2389                 if (!t)
2390                         continue;
2391
2392                 BUG_ON(t->buffer == NULL);
2393                 if (t->buffer->target_node) {
2394                         struct binder_node *target_node = t->buffer->target_node;
2395
2396                         tr.target.ptr = target_node->ptr;
2397                         tr.cookie =  target_node->cookie;
2398                         t->saved_priority = task_nice(current);
2399                         if (t->priority < target_node->min_priority &&
2400                             !(t->flags & TF_ONE_WAY))
2401                                 binder_set_nice(t->priority);
2402                         else if (!(t->flags & TF_ONE_WAY) ||
2403                                  t->saved_priority > target_node->min_priority)
2404                                 binder_set_nice(target_node->min_priority);
2405                         cmd = BR_TRANSACTION;
2406                 } else {
2407                         tr.target.ptr = 0;
2408                         tr.cookie = 0;
2409                         cmd = BR_REPLY;
2410                 }
2411                 tr.code = t->code;
2412                 tr.flags = t->flags;
2413                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2414
2415                 if (t->from) {
2416                         struct task_struct *sender = t->from->proc->tsk;
2417
2418                         tr.sender_pid = task_tgid_nr_ns(sender,
2419                                                         task_active_pid_ns(current));
2420                 } else {
2421                         tr.sender_pid = 0;
2422                 }
2423
2424                 tr.data_size = t->buffer->data_size;
2425                 tr.offsets_size = t->buffer->offsets_size;
2426                 tr.data.ptr.buffer = (binder_uintptr_t)(
2427                                         (uintptr_t)t->buffer->data +
2428                                         proc->user_buffer_offset);
2429                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2430                                         ALIGN(t->buffer->data_size,
2431                                             sizeof(void *));
2432
2433                 if (put_user(cmd, (uint32_t __user *)ptr))
2434                         return -EFAULT;
2435                 ptr += sizeof(uint32_t);
2436                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2437                         return -EFAULT;
2438                 ptr += sizeof(tr);
2439
2440                 trace_binder_transaction_received(t);
2441                 binder_stat_br(proc, thread, cmd);
2442                 binder_debug(BINDER_DEBUG_TRANSACTION,
2443                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2444                              proc->pid, thread->pid,
2445                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2446                              "BR_REPLY",
2447                              t->debug_id, t->from ? t->from->proc->pid : 0,
2448                              t->from ? t->from->pid : 0, cmd,
2449                              t->buffer->data_size, t->buffer->offsets_size,
2450                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2451
2452                 list_del(&t->work.entry);
2453                 t->buffer->allow_user_free = 1;
2454                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2455                         t->to_parent = thread->transaction_stack;
2456                         t->to_thread = thread;
2457                         thread->transaction_stack = t;
2458                 } else {
2459                         t->buffer->transaction = NULL;
2460                         kfree(t);
2461                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2462                 }
2463                 break;
2464         }
2465
2466 done:
2467
2468         *consumed = ptr - buffer;
2469         if (proc->requested_threads + proc->ready_threads == 0 &&
2470             proc->requested_threads_started < proc->max_threads &&
2471             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2472              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2473              /*spawn a new thread if we leave this out */) {
2474                 proc->requested_threads++;
2475                 binder_debug(BINDER_DEBUG_THREADS,
2476                              "%d:%d BR_SPAWN_LOOPER\n",
2477                              proc->pid, thread->pid);
2478                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2479                         return -EFAULT;
2480                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2481         }
2482         return 0;
2483 }
2484
2485 static void binder_release_work(struct list_head *list)
2486 {
2487         struct binder_work *w;
2488
2489         while (!list_empty(list)) {
2490                 w = list_first_entry(list, struct binder_work, entry);
2491                 list_del_init(&w->entry);
2492                 switch (w->type) {
2493                 case BINDER_WORK_TRANSACTION: {
2494                         struct binder_transaction *t;
2495
2496                         t = container_of(w, struct binder_transaction, work);
2497                         if (t->buffer->target_node &&
2498                             !(t->flags & TF_ONE_WAY)) {
2499                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2500                         } else {
2501                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2502                                         "undelivered transaction %d\n",
2503                                         t->debug_id);
2504                                 t->buffer->transaction = NULL;
2505                                 kfree(t);
2506                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2507                         }
2508                 } break;
2509                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2510                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2511                                 "undelivered TRANSACTION_COMPLETE\n");
2512                         kfree(w);
2513                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2514                 } break;
2515                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2516                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2517                         struct binder_ref_death *death;
2518
2519                         death = container_of(w, struct binder_ref_death, work);
2520                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2521                                 "undelivered death notification, %016llx\n",
2522                                 (u64)death->cookie);
2523                         kfree(death);
2524                         binder_stats_deleted(BINDER_STAT_DEATH);
2525                 } break;
2526                 default:
2527                         pr_err("unexpected work type, %d, not freed\n",
2528                                w->type);
2529                         break;
2530                 }
2531         }
2532
2533 }
2534
2535 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2536 {
2537         struct binder_thread *thread = NULL;
2538         struct rb_node *parent = NULL;
2539         struct rb_node **p = &proc->threads.rb_node;
2540
2541         while (*p) {
2542                 parent = *p;
2543                 thread = rb_entry(parent, struct binder_thread, rb_node);
2544
2545                 if (current->pid < thread->pid)
2546                         p = &(*p)->rb_left;
2547                 else if (current->pid > thread->pid)
2548                         p = &(*p)->rb_right;
2549                 else
2550                         break;
2551         }
2552         if (*p == NULL) {
2553                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2554                 if (thread == NULL)
2555                         return NULL;
2556                 binder_stats_created(BINDER_STAT_THREAD);
2557                 thread->proc = proc;
2558                 thread->pid = current->pid;
2559                 init_waitqueue_head(&thread->wait);
2560                 INIT_LIST_HEAD(&thread->todo);
2561                 rb_link_node(&thread->rb_node, parent, p);
2562                 rb_insert_color(&thread->rb_node, &proc->threads);
2563                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2564                 thread->return_error = BR_OK;
2565                 thread->return_error2 = BR_OK;
2566         }
2567         return thread;
2568 }
2569
2570 static int binder_free_thread(struct binder_proc *proc,
2571                               struct binder_thread *thread)
2572 {
2573         struct binder_transaction *t;
2574         struct binder_transaction *send_reply = NULL;
2575         int active_transactions = 0;
2576
2577         rb_erase(&thread->rb_node, &proc->threads);
2578         t = thread->transaction_stack;
2579         if (t && t->to_thread == thread)
2580                 send_reply = t;
2581         while (t) {
2582                 active_transactions++;
2583                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2584                              "release %d:%d transaction %d %s, still active\n",
2585                               proc->pid, thread->pid,
2586                              t->debug_id,
2587                              (t->to_thread == thread) ? "in" : "out");
2588
2589                 if (t->to_thread == thread) {
2590                         t->to_proc = NULL;
2591                         t->to_thread = NULL;
2592                         if (t->buffer) {
2593                                 t->buffer->transaction = NULL;
2594                                 t->buffer = NULL;
2595                         }
2596                         t = t->to_parent;
2597                 } else if (t->from == thread) {
2598                         t->from = NULL;
2599                         t = t->from_parent;
2600                 } else
2601                         BUG();
2602         }
2603         if (send_reply)
2604                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2605         binder_release_work(&thread->todo);
2606         kfree(thread);
2607         binder_stats_deleted(BINDER_STAT_THREAD);
2608         return active_transactions;
2609 }
2610
2611 static unsigned int binder_poll(struct file *filp,
2612                                 struct poll_table_struct *wait)
2613 {
2614         struct binder_proc *proc = filp->private_data;
2615         struct binder_thread *thread = NULL;
2616         int wait_for_proc_work;
2617
2618         binder_lock(__func__);
2619
2620         thread = binder_get_thread(proc);
2621
2622         wait_for_proc_work = thread->transaction_stack == NULL &&
2623                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2624
2625         binder_unlock(__func__);
2626
2627         if (wait_for_proc_work) {
2628                 if (binder_has_proc_work(proc, thread))
2629                         return POLLIN;
2630                 poll_wait(filp, &proc->wait, wait);
2631                 if (binder_has_proc_work(proc, thread))
2632                         return POLLIN;
2633         } else {
2634                 if (binder_has_thread_work(thread))
2635                         return POLLIN;
2636                 poll_wait(filp, &thread->wait, wait);
2637                 if (binder_has_thread_work(thread))
2638                         return POLLIN;
2639         }
2640         return 0;
2641 }
2642
2643 static int binder_ioctl_write_read(struct file *filp,
2644                                 unsigned int cmd, unsigned long arg,
2645                                 struct binder_thread *thread)
2646 {
2647         int ret = 0;
2648         struct binder_proc *proc = filp->private_data;
2649         unsigned int size = _IOC_SIZE(cmd);
2650         void __user *ubuf = (void __user *)arg;
2651         struct binder_write_read bwr;
2652
2653         if (size != sizeof(struct binder_write_read)) {
2654                 ret = -EINVAL;
2655                 goto out;
2656         }
2657         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2658                 ret = -EFAULT;
2659                 goto out;
2660         }
2661         binder_debug(BINDER_DEBUG_READ_WRITE,
2662                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2663                      proc->pid, thread->pid,
2664                      (u64)bwr.write_size, (u64)bwr.write_buffer,
2665                      (u64)bwr.read_size, (u64)bwr.read_buffer);
2666
2667         if (bwr.write_size > 0) {
2668                 ret = binder_thread_write(proc, thread,
2669                                           bwr.write_buffer,
2670                                           bwr.write_size,
2671                                           &bwr.write_consumed);
2672                 trace_binder_write_done(ret);
2673                 if (ret < 0) {
2674                         bwr.read_consumed = 0;
2675                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2676                                 ret = -EFAULT;
2677                         goto out;
2678                 }
2679         }
2680         if (bwr.read_size > 0) {
2681                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2682                                          bwr.read_size,
2683                                          &bwr.read_consumed,
2684                                          filp->f_flags & O_NONBLOCK);
2685                 trace_binder_read_done(ret);
2686                 if (!list_empty(&proc->todo))
2687                         wake_up_interruptible(&proc->wait);
2688                 if (ret < 0) {
2689                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2690                                 ret = -EFAULT;
2691                         goto out;
2692                 }
2693         }
2694         binder_debug(BINDER_DEBUG_READ_WRITE,
2695                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2696                      proc->pid, thread->pid,
2697                      (u64)bwr.write_consumed, (u64)bwr.write_size,
2698                      (u64)bwr.read_consumed, (u64)bwr.read_size);
2699         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2700                 ret = -EFAULT;
2701                 goto out;
2702         }
2703 out:
2704         return ret;
2705 }
2706
2707 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2708 {
2709         int ret = 0;
2710         struct binder_proc *proc = filp->private_data;
2711         kuid_t curr_euid = current_euid();
2712
2713         if (binder_context_mgr_node != NULL) {
2714                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2715                 ret = -EBUSY;
2716                 goto out;
2717         }
2718         ret = security_binder_set_context_mgr(proc->tsk);
2719         if (ret < 0)
2720                 goto out;
2721         if (uid_valid(binder_context_mgr_uid)) {
2722                 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2723                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2724                                from_kuid(&init_user_ns, curr_euid),
2725                                from_kuid(&init_user_ns,
2726                                         binder_context_mgr_uid));
2727                         ret = -EPERM;
2728                         goto out;
2729                 }
2730         } else {
2731                 binder_context_mgr_uid = curr_euid;
2732         }
2733         binder_context_mgr_node = binder_new_node(proc, 0, 0);
2734         if (binder_context_mgr_node == NULL) {
2735                 ret = -ENOMEM;
2736                 goto out;
2737         }
2738         binder_context_mgr_node->local_weak_refs++;
2739         binder_context_mgr_node->local_strong_refs++;
2740         binder_context_mgr_node->has_strong_ref = 1;
2741         binder_context_mgr_node->has_weak_ref = 1;
2742 out:
2743         return ret;
2744 }
2745
2746 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2747 {
2748         int ret;
2749         struct binder_proc *proc = filp->private_data;
2750         struct binder_thread *thread;
2751         unsigned int size = _IOC_SIZE(cmd);
2752         void __user *ubuf = (void __user *)arg;
2753
2754         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2755                         proc->pid, current->pid, cmd, arg);*/
2756
2757         trace_binder_ioctl(cmd, arg);
2758
2759         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2760         if (ret)
2761                 goto err_unlocked;
2762
2763         binder_lock(__func__);
2764         thread = binder_get_thread(proc);
2765         if (thread == NULL) {
2766                 ret = -ENOMEM;
2767                 goto err;
2768         }
2769
2770         switch (cmd) {
2771         case BINDER_WRITE_READ:
2772                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2773                 if (ret)
2774                         goto err;
2775                 break;
2776         case BINDER_SET_MAX_THREADS:
2777                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2778                         ret = -EINVAL;
2779                         goto err;
2780                 }
2781                 break;
2782         case BINDER_SET_CONTEXT_MGR:
2783                 ret = binder_ioctl_set_ctx_mgr(filp);
2784                 if (ret)
2785                         goto err;
2786                 break;
2787         case BINDER_THREAD_EXIT:
2788                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2789                              proc->pid, thread->pid);
2790                 binder_free_thread(proc, thread);
2791                 thread = NULL;
2792                 break;
2793         case BINDER_VERSION: {
2794                 struct binder_version __user *ver = ubuf;
2795
2796                 if (size != sizeof(struct binder_version)) {
2797                         ret = -EINVAL;
2798                         goto err;
2799                 }
2800                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2801                              &ver->protocol_version)) {
2802                         ret = -EINVAL;
2803                         goto err;
2804                 }
2805                 break;
2806         }
2807         default:
2808                 ret = -EINVAL;
2809                 goto err;
2810         }
2811         ret = 0;
2812 err:
2813         if (thread)
2814                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2815         binder_unlock(__func__);
2816         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2817         if (ret && ret != -ERESTARTSYS)
2818                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2819 err_unlocked:
2820         trace_binder_ioctl_done(ret);
2821         return ret;
2822 }
2823
2824 static void binder_vma_open(struct vm_area_struct *vma)
2825 {
2826         struct binder_proc *proc = vma->vm_private_data;
2827
2828         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2829                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2830                      proc->pid, vma->vm_start, vma->vm_end,
2831                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2832                      (unsigned long)pgprot_val(vma->vm_page_prot));
2833 }
2834
2835 static void binder_vma_close(struct vm_area_struct *vma)
2836 {
2837         struct binder_proc *proc = vma->vm_private_data;
2838
2839         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2840                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2841                      proc->pid, vma->vm_start, vma->vm_end,
2842                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2843                      (unsigned long)pgprot_val(vma->vm_page_prot));
2844         proc->vma = NULL;
2845         proc->vma_vm_mm = NULL;
2846         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2847 }
2848
2849 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2850 {
2851         return VM_FAULT_SIGBUS;
2852 }
2853
2854 static const struct vm_operations_struct binder_vm_ops = {
2855         .open = binder_vma_open,
2856         .close = binder_vma_close,
2857         .fault = binder_vm_fault,
2858 };
2859
2860 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2861 {
2862         int ret;
2863         struct vm_struct *area;
2864         struct binder_proc *proc = filp->private_data;
2865         const char *failure_string;
2866         struct binder_buffer *buffer;
2867
2868         if (proc->tsk != current)
2869                 return -EINVAL;
2870
2871         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2872                 vma->vm_end = vma->vm_start + SZ_4M;
2873
2874         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2875                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2876                      proc->pid, vma->vm_start, vma->vm_end,
2877                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2878                      (unsigned long)pgprot_val(vma->vm_page_prot));
2879
2880         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2881                 ret = -EPERM;
2882                 failure_string = "bad vm_flags";
2883                 goto err_bad_arg;
2884         }
2885         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2886
2887         mutex_lock(&binder_mmap_lock);
2888         if (proc->buffer) {
2889                 ret = -EBUSY;
2890                 failure_string = "already mapped";
2891                 goto err_already_mapped;
2892         }
2893
2894         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2895         if (area == NULL) {
2896                 ret = -ENOMEM;
2897                 failure_string = "get_vm_area";
2898                 goto err_get_vm_area_failed;
2899         }
2900         proc->buffer = area->addr;
2901         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2902         mutex_unlock(&binder_mmap_lock);
2903
2904 #ifdef CONFIG_CPU_CACHE_VIPT
2905         if (cache_is_vipt_aliasing()) {
2906                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2907                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2908                         vma->vm_start += PAGE_SIZE;
2909                 }
2910         }
2911 #endif
2912         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2913         if (proc->pages == NULL) {
2914                 ret = -ENOMEM;
2915                 failure_string = "alloc page array";
2916                 goto err_alloc_pages_failed;
2917         }
2918         proc->buffer_size = vma->vm_end - vma->vm_start;
2919
2920         vma->vm_ops = &binder_vm_ops;
2921         vma->vm_private_data = proc;
2922
2923         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2924                 ret = -ENOMEM;
2925                 failure_string = "alloc small buf";
2926                 goto err_alloc_small_buf_failed;
2927         }
2928         buffer = proc->buffer;
2929         INIT_LIST_HEAD(&proc->buffers);
2930         list_add(&buffer->entry, &proc->buffers);
2931         buffer->free = 1;
2932         binder_insert_free_buffer(proc, buffer);
2933         proc->free_async_space = proc->buffer_size / 2;
2934         barrier();
2935         proc->files = get_files_struct(current);
2936         proc->vma = vma;
2937         proc->vma_vm_mm = vma->vm_mm;
2938
2939         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2940                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2941         return 0;
2942
2943 err_alloc_small_buf_failed:
2944         kfree(proc->pages);
2945         proc->pages = NULL;
2946 err_alloc_pages_failed:
2947         mutex_lock(&binder_mmap_lock);
2948         vfree(proc->buffer);
2949         proc->buffer = NULL;
2950 err_get_vm_area_failed:
2951 err_already_mapped:
2952         mutex_unlock(&binder_mmap_lock);
2953 err_bad_arg:
2954         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2955                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2956         return ret;
2957 }
2958
2959 static int binder_open(struct inode *nodp, struct file *filp)
2960 {
2961         struct binder_proc *proc;
2962
2963         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2964                      current->group_leader->pid, current->pid);
2965
2966         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2967         if (proc == NULL)
2968                 return -ENOMEM;
2969         get_task_struct(current);
2970         proc->tsk = current;
2971         INIT_LIST_HEAD(&proc->todo);
2972         init_waitqueue_head(&proc->wait);
2973         proc->default_priority = task_nice(current);
2974
2975         binder_lock(__func__);
2976
2977         binder_stats_created(BINDER_STAT_PROC);
2978         hlist_add_head(&proc->proc_node, &binder_procs);
2979         proc->pid = current->group_leader->pid;
2980         INIT_LIST_HEAD(&proc->delivered_death);
2981         filp->private_data = proc;
2982
2983         binder_unlock(__func__);
2984
2985         if (binder_debugfs_dir_entry_proc) {
2986                 char strbuf[11];
2987
2988                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2989                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2990                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2991         }
2992
2993         return 0;
2994 }
2995
2996 static int binder_flush(struct file *filp, fl_owner_t id)
2997 {
2998         struct binder_proc *proc = filp->private_data;
2999
3000         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3001
3002         return 0;
3003 }
3004
3005 static void binder_deferred_flush(struct binder_proc *proc)
3006 {
3007         struct rb_node *n;
3008         int wake_count = 0;
3009
3010         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3011                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3012
3013                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3014                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3015                         wake_up_interruptible(&thread->wait);
3016                         wake_count++;
3017                 }
3018         }
3019         wake_up_interruptible_all(&proc->wait);
3020
3021         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3022                      "binder_flush: %d woke %d threads\n", proc->pid,
3023                      wake_count);
3024 }
3025
3026 static int binder_release(struct inode *nodp, struct file *filp)
3027 {
3028         struct binder_proc *proc = filp->private_data;
3029
3030         debugfs_remove(proc->debugfs_entry);
3031         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3032
3033         return 0;
3034 }
3035
3036 static int binder_node_release(struct binder_node *node, int refs)
3037 {
3038         struct binder_ref *ref;
3039         int death = 0;
3040
3041         list_del_init(&node->work.entry);
3042         binder_release_work(&node->async_todo);
3043
3044         if (hlist_empty(&node->refs)) {
3045                 kfree(node);
3046                 binder_stats_deleted(BINDER_STAT_NODE);
3047
3048                 return refs;
3049         }
3050
3051         node->proc = NULL;
3052         node->local_strong_refs = 0;
3053         node->local_weak_refs = 0;
3054         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3055
3056         hlist_for_each_entry(ref, &node->refs, node_entry) {
3057                 refs++;
3058
3059                 if (!ref->death)
3060                         continue;
3061
3062                 death++;
3063
3064                 if (list_empty(&ref->death->work.entry)) {
3065                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3066                         list_add_tail(&ref->death->work.entry,
3067                                       &ref->proc->todo);
3068                         wake_up_interruptible(&ref->proc->wait);
3069                 } else
3070                         BUG();
3071         }
3072
3073         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3074                      "node %d now dead, refs %d, death %d\n",
3075                      node->debug_id, refs, death);
3076
3077         return refs;
3078 }
3079
3080 static void binder_deferred_release(struct binder_proc *proc)
3081 {
3082         struct binder_transaction *t;
3083         struct rb_node *n;
3084         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3085                 active_transactions, page_count;
3086
3087         BUG_ON(proc->vma);
3088         BUG_ON(proc->files);
3089
3090         hlist_del(&proc->proc_node);
3091
3092         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3093                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3094                              "%s: %d context_mgr_node gone\n",
3095                              __func__, proc->pid);
3096                 binder_context_mgr_node = NULL;
3097         }
3098
3099         threads = 0;
3100         active_transactions = 0;
3101         while ((n = rb_first(&proc->threads))) {
3102                 struct binder_thread *thread;
3103
3104                 thread = rb_entry(n, struct binder_thread, rb_node);
3105                 threads++;
3106                 active_transactions += binder_free_thread(proc, thread);
3107         }
3108
3109         nodes = 0;
3110         incoming_refs = 0;
3111         while ((n = rb_first(&proc->nodes))) {
3112                 struct binder_node *node;
3113
3114                 node = rb_entry(n, struct binder_node, rb_node);
3115                 nodes++;
3116                 rb_erase(&node->rb_node, &proc->nodes);
3117                 incoming_refs = binder_node_release(node, incoming_refs);
3118         }
3119
3120         outgoing_refs = 0;
3121         while ((n = rb_first(&proc->refs_by_desc))) {
3122                 struct binder_ref *ref;
3123
3124                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3125                 outgoing_refs++;
3126                 binder_delete_ref(ref);
3127         }
3128
3129         binder_release_work(&proc->todo);
3130         binder_release_work(&proc->delivered_death);
3131
3132         buffers = 0;
3133         while ((n = rb_first(&proc->allocated_buffers))) {
3134                 struct binder_buffer *buffer;
3135
3136                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3137
3138                 t = buffer->transaction;
3139                 if (t) {
3140                         t->buffer = NULL;
3141                         buffer->transaction = NULL;
3142                         pr_err("release proc %d, transaction %d, not freed\n",
3143                                proc->pid, t->debug_id);
3144                         /*BUG();*/
3145                 }
3146
3147                 binder_free_buf(proc, buffer);
3148                 buffers++;
3149         }
3150
3151         binder_stats_deleted(BINDER_STAT_PROC);
3152
3153         page_count = 0;
3154         if (proc->pages) {
3155                 int i;
3156
3157                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3158                         void *page_addr;
3159
3160                         if (!proc->pages[i])
3161                                 continue;
3162
3163                         page_addr = proc->buffer + i * PAGE_SIZE;
3164                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3165                                      "%s: %d: page %d at %p not freed\n",
3166                                      __func__, proc->pid, i, page_addr);
3167                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3168                         __free_page(proc->pages[i]);
3169                         page_count++;
3170                 }
3171                 kfree(proc->pages);
3172                 vfree(proc->buffer);
3173         }
3174
3175         put_task_struct(proc->tsk);
3176
3177         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3178                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3179                      __func__, proc->pid, threads, nodes, incoming_refs,
3180                      outgoing_refs, active_transactions, buffers, page_count);
3181
3182         kfree(proc);
3183 }
3184
3185 static void binder_deferred_func(struct work_struct *work)
3186 {
3187         struct binder_proc *proc;
3188         struct files_struct *files;
3189
3190         int defer;
3191
3192         do {
3193                 binder_lock(__func__);
3194                 mutex_lock(&binder_deferred_lock);
3195                 if (!hlist_empty(&binder_deferred_list)) {
3196                         proc = hlist_entry(binder_deferred_list.first,
3197                                         struct binder_proc, deferred_work_node);
3198                         hlist_del_init(&proc->deferred_work_node);
3199                         defer = proc->deferred_work;
3200                         proc->deferred_work = 0;
3201                 } else {
3202                         proc = NULL;
3203                         defer = 0;
3204                 }
3205                 mutex_unlock(&binder_deferred_lock);
3206
3207                 files = NULL;
3208                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3209                         files = proc->files;
3210                         if (files)
3211                                 proc->files = NULL;
3212                 }
3213
3214                 if (defer & BINDER_DEFERRED_FLUSH)
3215                         binder_deferred_flush(proc);
3216
3217                 if (defer & BINDER_DEFERRED_RELEASE)
3218                         binder_deferred_release(proc); /* frees proc */
3219
3220                 binder_unlock(__func__);
3221                 if (files)
3222                         put_files_struct(files);
3223         } while (proc);
3224 }
3225 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3226
3227 static void
3228 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3229 {
3230         mutex_lock(&binder_deferred_lock);
3231         proc->deferred_work |= defer;
3232         if (hlist_unhashed(&proc->deferred_work_node)) {
3233                 hlist_add_head(&proc->deferred_work_node,
3234                                 &binder_deferred_list);
3235                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3236         }
3237         mutex_unlock(&binder_deferred_lock);
3238 }
3239
3240 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3241                                      struct binder_transaction *t)
3242 {
3243         seq_printf(m,
3244                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3245                    prefix, t->debug_id, t,
3246                    t->from ? t->from->proc->pid : 0,
3247                    t->from ? t->from->pid : 0,
3248                    t->to_proc ? t->to_proc->pid : 0,
3249                    t->to_thread ? t->to_thread->pid : 0,
3250                    t->code, t->flags, t->priority, t->need_reply);
3251         if (t->buffer == NULL) {
3252                 seq_puts(m, " buffer free\n");
3253                 return;
3254         }
3255         if (t->buffer->target_node)
3256                 seq_printf(m, " node %d",
3257                            t->buffer->target_node->debug_id);
3258         seq_printf(m, " size %zd:%zd data %p\n",
3259                    t->buffer->data_size, t->buffer->offsets_size,
3260                    t->buffer->data);
3261 }
3262
3263 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3264                                 struct binder_buffer *buffer)
3265 {
3266         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3267                    prefix, buffer->debug_id, buffer->data,
3268                    buffer->data_size, buffer->offsets_size,
3269                    buffer->transaction ? "active" : "delivered");
3270 }
3271
3272 static void print_binder_work(struct seq_file *m, const char *prefix,
3273                               const char *transaction_prefix,
3274                               struct binder_work *w)
3275 {
3276         struct binder_node *node;
3277         struct binder_transaction *t;
3278
3279         switch (w->type) {
3280         case BINDER_WORK_TRANSACTION:
3281                 t = container_of(w, struct binder_transaction, work);
3282                 print_binder_transaction(m, transaction_prefix, t);
3283                 break;
3284         case BINDER_WORK_TRANSACTION_COMPLETE:
3285                 seq_printf(m, "%stransaction complete\n", prefix);
3286                 break;
3287         case BINDER_WORK_NODE:
3288                 node = container_of(w, struct binder_node, work);
3289                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3290                            prefix, node->debug_id,
3291                            (u64)node->ptr, (u64)node->cookie);
3292                 break;
3293         case BINDER_WORK_DEAD_BINDER:
3294                 seq_printf(m, "%shas dead binder\n", prefix);
3295                 break;
3296         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3297                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3298                 break;
3299         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3300                 seq_printf(m, "%shas cleared death notification\n", prefix);
3301                 break;
3302         default:
3303                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3304                 break;
3305         }
3306 }
3307
3308 static void print_binder_thread(struct seq_file *m,
3309                                 struct binder_thread *thread,
3310                                 int print_always)
3311 {
3312         struct binder_transaction *t;
3313         struct binder_work *w;
3314         size_t start_pos = m->count;
3315         size_t header_pos;
3316
3317         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3318         header_pos = m->count;
3319         t = thread->transaction_stack;
3320         while (t) {
3321                 if (t->from == thread) {
3322                         print_binder_transaction(m,
3323                                                  "    outgoing transaction", t);
3324                         t = t->from_parent;
3325                 } else if (t->to_thread == thread) {
3326                         print_binder_transaction(m,
3327                                                  "    incoming transaction", t);
3328                         t = t->to_parent;
3329                 } else {
3330                         print_binder_transaction(m, "    bad transaction", t);
3331                         t = NULL;
3332                 }
3333         }
3334         list_for_each_entry(w, &thread->todo, entry) {
3335                 print_binder_work(m, "    ", "    pending transaction", w);
3336         }
3337         if (!print_always && m->count == header_pos)
3338                 m->count = start_pos;
3339 }
3340
3341 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3342 {
3343         struct binder_ref *ref;
3344         struct binder_work *w;
3345         int count;
3346
3347         count = 0;
3348         hlist_for_each_entry(ref, &node->refs, node_entry)
3349                 count++;
3350
3351         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3352                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3353                    node->has_strong_ref, node->has_weak_ref,
3354                    node->local_strong_refs, node->local_weak_refs,
3355                    node->internal_strong_refs, count);
3356         if (count) {
3357                 seq_puts(m, " proc");
3358                 hlist_for_each_entry(ref, &node->refs, node_entry)
3359                         seq_printf(m, " %d", ref->proc->pid);
3360         }
3361         seq_puts(m, "\n");
3362         list_for_each_entry(w, &node->async_todo, entry)
3363                 print_binder_work(m, "    ",
3364                                   "    pending async transaction", w);
3365 }
3366
3367 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3368 {
3369         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3370                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3371                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3372 }
3373
3374 static void print_binder_proc(struct seq_file *m,
3375                               struct binder_proc *proc, int print_all)
3376 {
3377         struct binder_work *w;
3378         struct rb_node *n;
3379         size_t start_pos = m->count;
3380         size_t header_pos;
3381
3382         seq_printf(m, "proc %d\n", proc->pid);
3383         header_pos = m->count;
3384
3385         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3386                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3387                                                 rb_node), print_all);
3388         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3389                 struct binder_node *node = rb_entry(n, struct binder_node,
3390                                                     rb_node);
3391                 if (print_all || node->has_async_transaction)
3392                         print_binder_node(m, node);
3393         }
3394         if (print_all) {
3395                 for (n = rb_first(&proc->refs_by_desc);
3396                      n != NULL;
3397                      n = rb_next(n))
3398                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3399                                                      rb_node_desc));
3400         }
3401         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3402                 print_binder_buffer(m, "  buffer",
3403                                     rb_entry(n, struct binder_buffer, rb_node));
3404         list_for_each_entry(w, &proc->todo, entry)
3405                 print_binder_work(m, "  ", "  pending transaction", w);
3406         list_for_each_entry(w, &proc->delivered_death, entry) {
3407                 seq_puts(m, "  has delivered dead binder\n");
3408                 break;
3409         }
3410         if (!print_all && m->count == header_pos)
3411                 m->count = start_pos;
3412 }
3413
3414 static const char * const binder_return_strings[] = {
3415         "BR_ERROR",
3416         "BR_OK",
3417         "BR_TRANSACTION",
3418         "BR_REPLY",
3419         "BR_ACQUIRE_RESULT",
3420         "BR_DEAD_REPLY",
3421         "BR_TRANSACTION_COMPLETE",
3422         "BR_INCREFS",
3423         "BR_ACQUIRE",
3424         "BR_RELEASE",
3425         "BR_DECREFS",
3426         "BR_ATTEMPT_ACQUIRE",
3427         "BR_NOOP",
3428         "BR_SPAWN_LOOPER",
3429         "BR_FINISHED",
3430         "BR_DEAD_BINDER",
3431         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3432         "BR_FAILED_REPLY"
3433 };
3434
3435 static const char * const binder_command_strings[] = {
3436         "BC_TRANSACTION",
3437         "BC_REPLY",
3438         "BC_ACQUIRE_RESULT",
3439         "BC_FREE_BUFFER",
3440         "BC_INCREFS",
3441         "BC_ACQUIRE",
3442         "BC_RELEASE",
3443         "BC_DECREFS",
3444         "BC_INCREFS_DONE",
3445         "BC_ACQUIRE_DONE",
3446         "BC_ATTEMPT_ACQUIRE",
3447         "BC_REGISTER_LOOPER",
3448         "BC_ENTER_LOOPER",
3449         "BC_EXIT_LOOPER",
3450         "BC_REQUEST_DEATH_NOTIFICATION",
3451         "BC_CLEAR_DEATH_NOTIFICATION",
3452         "BC_DEAD_BINDER_DONE"
3453 };
3454
3455 static const char * const binder_objstat_strings[] = {
3456         "proc",
3457         "thread",
3458         "node",
3459         "ref",
3460         "death",
3461         "transaction",
3462         "transaction_complete"
3463 };
3464
3465 static void print_binder_stats(struct seq_file *m, const char *prefix,
3466                                struct binder_stats *stats)
3467 {
3468         int i;
3469
3470         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3471                      ARRAY_SIZE(binder_command_strings));
3472         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3473                 if (stats->bc[i])
3474                         seq_printf(m, "%s%s: %d\n", prefix,
3475                                    binder_command_strings[i], stats->bc[i]);
3476         }
3477
3478         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3479                      ARRAY_SIZE(binder_return_strings));
3480         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3481                 if (stats->br[i])
3482                         seq_printf(m, "%s%s: %d\n", prefix,
3483                                    binder_return_strings[i], stats->br[i]);
3484         }
3485
3486         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3487                      ARRAY_SIZE(binder_objstat_strings));
3488         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3489                      ARRAY_SIZE(stats->obj_deleted));
3490         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3491                 if (stats->obj_created[i] || stats->obj_deleted[i])
3492                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3493                                 binder_objstat_strings[i],
3494                                 stats->obj_created[i] - stats->obj_deleted[i],
3495                                 stats->obj_created[i]);
3496         }
3497 }
3498
3499 static void print_binder_proc_stats(struct seq_file *m,
3500                                     struct binder_proc *proc)
3501 {
3502         struct binder_work *w;
3503         struct rb_node *n;
3504         int count, strong, weak;
3505
3506         seq_printf(m, "proc %d\n", proc->pid);
3507         count = 0;
3508         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3509                 count++;
3510         seq_printf(m, "  threads: %d\n", count);
3511         seq_printf(m, "  requested threads: %d+%d/%d\n"
3512                         "  ready threads %d\n"
3513                         "  free async space %zd\n", proc->requested_threads,
3514                         proc->requested_threads_started, proc->max_threads,
3515                         proc->ready_threads, proc->free_async_space);
3516         count = 0;
3517         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3518                 count++;
3519         seq_printf(m, "  nodes: %d\n", count);
3520         count = 0;
3521         strong = 0;
3522         weak = 0;
3523         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3524                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3525                                                   rb_node_desc);
3526                 count++;
3527                 strong += ref->strong;
3528                 weak += ref->weak;
3529         }
3530         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3531
3532         count = 0;
3533         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3534                 count++;
3535         seq_printf(m, "  buffers: %d\n", count);
3536
3537         count = 0;
3538         list_for_each_entry(w, &proc->todo, entry) {
3539                 switch (w->type) {
3540                 case BINDER_WORK_TRANSACTION:
3541                         count++;
3542                         break;
3543                 default:
3544                         break;
3545                 }
3546         }
3547         seq_printf(m, "  pending transactions: %d\n", count);
3548
3549         print_binder_stats(m, "  ", &proc->stats);
3550 }
3551
3552
3553 static int binder_state_show(struct seq_file *m, void *unused)
3554 {
3555         struct binder_proc *proc;
3556         struct binder_node *node;
3557         int do_lock = !binder_debug_no_lock;
3558
3559         if (do_lock)
3560                 binder_lock(__func__);
3561
3562         seq_puts(m, "binder state:\n");
3563
3564         if (!hlist_empty(&binder_dead_nodes))
3565                 seq_puts(m, "dead nodes:\n");
3566         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3567                 print_binder_node(m, node);
3568
3569         hlist_for_each_entry(proc, &binder_procs, proc_node)
3570                 print_binder_proc(m, proc, 1);
3571         if (do_lock)
3572                 binder_unlock(__func__);
3573         return 0;
3574 }
3575
3576 static int binder_stats_show(struct seq_file *m, void *unused)
3577 {
3578         struct binder_proc *proc;
3579         int do_lock = !binder_debug_no_lock;
3580
3581         if (do_lock)
3582                 binder_lock(__func__);
3583
3584         seq_puts(m, "binder stats:\n");
3585
3586         print_binder_stats(m, "", &binder_stats);
3587
3588         hlist_for_each_entry(proc, &binder_procs, proc_node)
3589                 print_binder_proc_stats(m, proc);
3590         if (do_lock)
3591                 binder_unlock(__func__);
3592         return 0;
3593 }
3594
3595 static int binder_transactions_show(struct seq_file *m, void *unused)
3596 {
3597         struct binder_proc *proc;
3598         int do_lock = !binder_debug_no_lock;
3599
3600         if (do_lock)
3601                 binder_lock(__func__);
3602
3603         seq_puts(m, "binder transactions:\n");
3604         hlist_for_each_entry(proc, &binder_procs, proc_node)
3605                 print_binder_proc(m, proc, 0);
3606         if (do_lock)
3607                 binder_unlock(__func__);
3608         return 0;
3609 }
3610
3611 static int binder_proc_show(struct seq_file *m, void *unused)
3612 {
3613         struct binder_proc *proc = m->private;
3614         int do_lock = !binder_debug_no_lock;
3615
3616         if (do_lock)
3617                 binder_lock(__func__);
3618         seq_puts(m, "binder proc state:\n");
3619         print_binder_proc(m, proc, 1);
3620         if (do_lock)
3621                 binder_unlock(__func__);
3622         return 0;
3623 }
3624
3625 static void print_binder_transaction_log_entry(struct seq_file *m,
3626                                         struct binder_transaction_log_entry *e)
3627 {
3628         seq_printf(m,
3629                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3630                    e->debug_id, (e->call_type == 2) ? "reply" :
3631                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3632                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3633                    e->target_handle, e->data_size, e->offsets_size);
3634 }
3635
3636 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3637 {
3638         struct binder_transaction_log *log = m->private;
3639         int i;
3640
3641         if (log->full) {
3642                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3643                         print_binder_transaction_log_entry(m, &log->entry[i]);
3644         }
3645         for (i = 0; i < log->next; i++)
3646                 print_binder_transaction_log_entry(m, &log->entry[i]);
3647         return 0;
3648 }
3649
3650 static const struct file_operations binder_fops = {
3651         .owner = THIS_MODULE,
3652         .poll = binder_poll,
3653         .unlocked_ioctl = binder_ioctl,
3654         .compat_ioctl = binder_ioctl,
3655         .mmap = binder_mmap,
3656         .open = binder_open,
3657         .flush = binder_flush,
3658         .release = binder_release,
3659 };
3660
3661 static struct miscdevice binder_miscdev = {
3662         .minor = MISC_DYNAMIC_MINOR,
3663         .name = "binder",
3664         .fops = &binder_fops
3665 };
3666
3667 BINDER_DEBUG_ENTRY(state);
3668 BINDER_DEBUG_ENTRY(stats);
3669 BINDER_DEBUG_ENTRY(transactions);
3670 BINDER_DEBUG_ENTRY(transaction_log);
3671
3672 static int __init binder_init(void)
3673 {
3674         int ret;
3675
3676         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3677         if (!binder_deferred_workqueue)
3678                 return -ENOMEM;
3679
3680         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3681         if (binder_debugfs_dir_entry_root)
3682                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3683                                                  binder_debugfs_dir_entry_root);
3684         ret = misc_register(&binder_miscdev);
3685         if (binder_debugfs_dir_entry_root) {
3686                 debugfs_create_file("state",
3687                                     S_IRUGO,
3688                                     binder_debugfs_dir_entry_root,
3689                                     NULL,
3690                                     &binder_state_fops);
3691                 debugfs_create_file("stats",
3692                                     S_IRUGO,
3693                                     binder_debugfs_dir_entry_root,
3694                                     NULL,
3695                                     &binder_stats_fops);
3696                 debugfs_create_file("transactions",
3697                                     S_IRUGO,
3698                                     binder_debugfs_dir_entry_root,
3699                                     NULL,
3700                                     &binder_transactions_fops);
3701                 debugfs_create_file("transaction_log",
3702                                     S_IRUGO,
3703                                     binder_debugfs_dir_entry_root,
3704                                     &binder_transaction_log,
3705                                     &binder_transaction_log_fops);
3706                 debugfs_create_file("failed_transaction_log",
3707                                     S_IRUGO,
3708                                     binder_debugfs_dir_entry_root,
3709                                     &binder_transaction_log_failed,
3710                                     &binder_transaction_log_fops);
3711         }
3712         return ret;
3713 }
3714
3715 device_initcall(binder_init);
3716
3717 #define CREATE_TRACE_POINTS
3718 #include "binder_trace.h"
3719
3720 MODULE_LICENSE("GPL v2");