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