drivers/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <asm/cacheflush.h>
  21 #include <linux/fdtable.h>
  22 #include <linux/file.h>
  23 #include <linux/freezer.h>
  24 #include <linux/fs.h>
  25 #include <linux/list.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/nsproxy.h>
  31 #include <linux/poll.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/rbtree.h>
  34 #include <linux/sched.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/pid_namespace.h>
  40 #include <linux/security.h>
  41
  42 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  43 #define BINDER_IPC_32BIT 1
  44 #endif
  45
  46 #include <uapi/linux/android/binder.h>
  47 #include "binder_trace.h"
  48
  49 static DEFINE_MUTEX(binder_main_lock);
  50 static DEFINE_MUTEX(binder_deferred_lock);
  51 static DEFINE_MUTEX(binder_mmap_lock);
  52
  53 static HLIST_HEAD(binder_procs);
  54 static HLIST_HEAD(binder_deferred_list);
  55 static HLIST_HEAD(binder_dead_nodes);
  56
  57 static struct dentry *binder_debugfs_dir_entry_root;
  58 static struct dentry *binder_debugfs_dir_entry_proc;
  59 static struct binder_node *binder_context_mgr_node;
  60 static kuid_t binder_context_mgr_uid = INVALID_UID;
  61 static int binder_last_id;
  62
  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 mutex files_lock;
 306         const struct cred *cred;
 307         struct hlist_node deferred_work_node;
 308         int deferred_work;
 309         void *buffer;
 310         ptrdiff_t user_buffer_offset;
 311
 312         struct list_head buffers;
 313         struct rb_root free_buffers;
 314         struct rb_root allocated_buffers;
 315         size_t free_async_space;
 316
 317         struct page **pages;
 318         size_t buffer_size;
 319         uint32_t buffer_free;
 320         struct list_head todo;
 321         wait_queue_head_t wait;
 322         struct binder_stats stats;
 323         struct list_head delivered_death;
 324         int max_threads;
 325         int requested_threads;
 326         int requested_threads_started;
 327         int ready_threads;
 328         long default_priority;
 329         struct dentry *debugfs_entry;
 330 };
 331
 332 enum {
 333         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 334         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 335         BINDER_LOOPER_STATE_EXITED      = 0x04,
 336         BINDER_LOOPER_STATE_INVALID     = 0x08,
 337         BINDER_LOOPER_STATE_WAITING     = 0x10,
 338         BINDER_LOOPER_STATE_NEED_RETURN = 0x20,
 339         BINDER_LOOPER_STATE_POLL        = 0x40,
 340 };
 341
 342 struct binder_thread {
 343         struct binder_proc *proc;
 344         struct rb_node rb_node;
 345         int pid;
 346         int looper;
 347         struct binder_transaction *transaction_stack;
 348         struct list_head todo;
 349         uint32_t return_error; /* Write failed, return error code in read buf */
 350         uint32_t return_error2; /* Write failed, return error code in read */
 351                 /* buffer. Used when sending a reply to a dead process that */
 352                 /* we are also waiting on */
 353         wait_queue_head_t wait;
 354         struct binder_stats stats;
 355 };
 356
 357 struct binder_transaction {
 358         int debug_id;
 359         struct binder_work work;
 360         struct binder_thread *from;
 361         struct binder_transaction *from_parent;
 362         struct binder_proc *to_proc;
 363         struct binder_thread *to_thread;
 364         struct binder_transaction *to_parent;
 365         unsigned need_reply:1;
 366         /* unsigned is_dead:1; */       /* not used at the moment */
 367
 368         struct binder_buffer *buffer;
 369         unsigned int    code;
 370         unsigned int    flags;
 371         long    priority;
 372         long    saved_priority;
 373         kuid_t  sender_euid;
 374 };
 375
 376 static void
 377 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 378
 379 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 380 {
 381         unsigned long rlim_cur;
 382         unsigned long irqs;
 383         int ret;
 384
 385         mutex_lock(&proc->files_lock);
 386         if (proc->files == NULL) {
 387                 ret = -ESRCH;
 388                 goto err;
 389         }
 390         if (!lock_task_sighand(proc->tsk, &irqs)) {
 391                 ret = -EMFILE;
 392                 goto err;
 393         }
 394         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 395         unlock_task_sighand(proc->tsk, &irqs);
 396
 397         ret = __alloc_fd(proc->files, 0, rlim_cur, flags);
 398 err:
 399         mutex_unlock(&proc->files_lock);
 400         return ret;
 401 }
 402
 403 /*
 404  * copied from fd_install
 405  */
 406 static void task_fd_install(
 407         struct binder_proc *proc, unsigned int fd, struct file *file)
 408 {
 409         mutex_lock(&proc->files_lock);
 410         if (proc->files)
 411                 __fd_install(proc->files, fd, file);
 412         mutex_unlock(&proc->files_lock);
 413 }
 414
 415 /*
 416  * copied from sys_close
 417  */
 418 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 419 {
 420         int retval;
 421
 422         mutex_lock(&proc->files_lock);
 423         if (proc->files == NULL) {
 424                 retval = -ESRCH;
 425                 goto err;
 426         }
 427         retval = __close_fd(proc->files, fd);
 428         /* can't restart close syscall because file table entry was cleared */
 429         if (unlikely(retval == -ERESTARTSYS ||
 430                      retval == -ERESTARTNOINTR ||
 431                      retval == -ERESTARTNOHAND ||
 432                      retval == -ERESTART_RESTARTBLOCK))
 433                 retval = -EINTR;
 434 err:
 435         mutex_unlock(&proc->files_lock);
 436         return retval;
 437 }
 438
 439 static inline void binder_lock(const char *tag)
 440 {
 441         trace_binder_lock(tag);
 442         mutex_lock(&binder_main_lock);
 443         trace_binder_locked(tag);
 444 }
 445
 446 static inline void binder_unlock(const char *tag)
 447 {
 448         trace_binder_unlock(tag);
 449         mutex_unlock(&binder_main_lock);
 450 }
 451
 452 static void binder_set_nice(long nice)
 453 {
 454         long min_nice;
 455
 456         if (can_nice(current, nice)) {
 457                 set_user_nice(current, nice);
 458                 return;
 459         }
 460         min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 461         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 462                      "%d: nice value %ld not allowed use %ld instead\n",
 463                       current->pid, nice, min_nice);
 464         set_user_nice(current, min_nice);
 465         if (min_nice <= MAX_NICE)
 466                 return;
 467         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 468 }
 469
 470 static size_t binder_buffer_size(struct binder_proc *proc,
 471                                  struct binder_buffer *buffer)
 472 {
 473         if (list_is_last(&buffer->entry, &proc->buffers))
 474                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 475         return (size_t)list_entry(buffer->entry.next,
 476                           struct binder_buffer, entry) - (size_t)buffer->data;
 477 }
 478
 479 static void binder_insert_free_buffer(struct binder_proc *proc,
 480                                       struct binder_buffer *new_buffer)
 481 {
 482         struct rb_node **p = &proc->free_buffers.rb_node;
 483         struct rb_node *parent = NULL;
 484         struct binder_buffer *buffer;
 485         size_t buffer_size;
 486         size_t new_buffer_size;
 487
 488         BUG_ON(!new_buffer->free);
 489
 490         new_buffer_size = binder_buffer_size(proc, new_buffer);
 491
 492         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 493                      "%d: add free buffer, size %zd, at %pK\n",
 494                       proc->pid, new_buffer_size, new_buffer);
 495
 496         while (*p) {
 497                 parent = *p;
 498                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 499                 BUG_ON(!buffer->free);
 500
 501                 buffer_size = binder_buffer_size(proc, buffer);
 502
 503                 if (new_buffer_size < buffer_size)
 504                         p = &parent->rb_left;
 505                 else
 506                         p = &parent->rb_right;
 507         }
 508         rb_link_node(&new_buffer->rb_node, parent, p);
 509         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 510 }
 511
 512 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 513                                            struct binder_buffer *new_buffer)
 514 {
 515         struct rb_node **p = &proc->allocated_buffers.rb_node;
 516         struct rb_node *parent = NULL;
 517         struct binder_buffer *buffer;
 518
 519         BUG_ON(new_buffer->free);
 520
 521         while (*p) {
 522                 parent = *p;
 523                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 524                 BUG_ON(buffer->free);
 525
 526                 if (new_buffer < buffer)
 527                         p = &parent->rb_left;
 528                 else if (new_buffer > buffer)
 529                         p = &parent->rb_right;
 530                 else
 531                         BUG();
 532         }
 533         rb_link_node(&new_buffer->rb_node, parent, p);
 534         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 535 }
 536
 537 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 538                                                   uintptr_t user_ptr)
 539 {
 540         struct rb_node *n = proc->allocated_buffers.rb_node;
 541         struct binder_buffer *buffer;
 542         struct binder_buffer *kern_ptr;
 543
 544         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 545                 - offsetof(struct binder_buffer, data));
 546
 547         while (n) {
 548                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 549                 BUG_ON(buffer->free);
 550
 551                 if (kern_ptr < buffer)
 552                         n = n->rb_left;
 553                 else if (kern_ptr > buffer)
 554                         n = n->rb_right;
 555                 else
 556                         return buffer;
 557         }
 558         return NULL;
 559 }
 560
 561 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 562                                     void *start, void *end,
 563                                     struct vm_area_struct *vma)
 564 {
 565         void *page_addr;
 566         unsigned long user_page_addr;
 567         struct page **page;
 568         struct mm_struct *mm;
 569
 570         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 571                      "%d: %s pages %pK-%pK\n", proc->pid,
 572                      allocate ? "allocate" : "free", start, end);
 573
 574         if (end <= start)
 575                 return 0;
 576
 577         trace_binder_update_page_range(proc, allocate, start, end);
 578
 579         if (vma)
 580                 mm = NULL;
 581         else
 582                 mm = get_task_mm(proc->tsk);
 583
 584         if (mm) {
 585                 down_write(&mm->mmap_sem);
 586                 if (!mmget_still_valid(mm)) {
 587                         if (allocate == 0)
 588                                 goto free_range;
 589                         goto err_no_vma;
 590                 }
 591
 592                 vma = proc->vma;
 593                 if (vma && mm != proc->vma_vm_mm) {
 594                         pr_err("%d: vma mm and task mm mismatch\n",
 595                                 proc->pid);
 596                         vma = NULL;
 597                 }
 598         }
 599
 600         if (allocate == 0)
 601                 goto free_range;
 602
 603         if (vma == NULL) {
 604                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 605                         proc->pid);
 606                 goto err_no_vma;
 607         }
 608
 609         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 610                 int ret;
 611
 612                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 613
 614                 BUG_ON(*page);
 615                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 616                 if (*page == NULL) {
 617                         pr_err("%d: binder_alloc_buf failed for page at %pK\n",
 618                                 proc->pid, page_addr);
 619                         goto err_alloc_page_failed;
 620                 }
 621                 ret = map_kernel_range_noflush((unsigned long)page_addr,
 622                                         PAGE_SIZE, PAGE_KERNEL, page);
 623                 flush_cache_vmap((unsigned long)page_addr,
 624                                 (unsigned long)page_addr + PAGE_SIZE);
 625                 if (ret != 1) {
 626                         pr_err("%d: binder_alloc_buf failed to map page at %pK in kernel\n",
 627                                proc->pid, page_addr);
 628                         goto err_map_kernel_failed;
 629                 }
 630                 user_page_addr =
 631                         (uintptr_t)page_addr + proc->user_buffer_offset;
 632                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 633                 if (ret) {
 634                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 635                                proc->pid, user_page_addr);
 636                         goto err_vm_insert_page_failed;
 637                 }
 638                 /* vm_insert_page does not seem to increment the refcount */
 639         }
 640         if (mm) {
 641                 up_write(&mm->mmap_sem);
 642                 mmput(mm);
 643         }
 644         return 0;
 645
 646 free_range:
 647         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 648              page_addr -= PAGE_SIZE) {
 649                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 650                 if (vma)
 651                         zap_page_range(vma, (uintptr_t)page_addr +
 652                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 653 err_vm_insert_page_failed:
 654                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 655 err_map_kernel_failed:
 656                 __free_page(*page);
 657                 *page = NULL;
 658 err_alloc_page_failed:
 659                 ;
 660         }
 661 err_no_vma:
 662         if (mm) {
 663                 up_write(&mm->mmap_sem);
 664                 mmput(mm);
 665         }
 666         return -ENOMEM;
 667 }
 668
 669 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 670                                               size_t data_size,
 671                                               size_t offsets_size, int is_async)
 672 {
 673         struct rb_node *n = proc->free_buffers.rb_node;
 674         struct binder_buffer *buffer;
 675         size_t buffer_size;
 676         struct rb_node *best_fit = NULL;
 677         void *has_page_addr;
 678         void *end_page_addr;
 679         size_t size;
 680
 681         if (proc->vma == NULL) {
 682                 pr_err("%d: binder_alloc_buf, no vma\n",
 683                        proc->pid);
 684                 return NULL;
 685         }
 686
 687         size = ALIGN(data_size, sizeof(void *)) +
 688                 ALIGN(offsets_size, sizeof(void *));
 689
 690         if (size < data_size || size < offsets_size) {
 691                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 692                                 proc->pid, data_size, offsets_size);
 693                 return NULL;
 694         }
 695
 696         if (is_async &&
 697             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 698                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 699                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 700                               proc->pid, size);
 701                 return NULL;
 702         }
 703
 704         while (n) {
 705                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 706                 BUG_ON(!buffer->free);
 707                 buffer_size = binder_buffer_size(proc, buffer);
 708
 709                 if (size < buffer_size) {
 710                         best_fit = n;
 711                         n = n->rb_left;
 712                 } else if (size > buffer_size)
 713                         n = n->rb_right;
 714                 else {
 715                         best_fit = n;
 716                         break;
 717                 }
 718         }
 719         if (best_fit == NULL) {
 720                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 721                         proc->pid, size);
 722                 return NULL;
 723         }
 724         if (n == NULL) {
 725                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 726                 buffer_size = binder_buffer_size(proc, buffer);
 727         }
 728
 729         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 730                      "%d: binder_alloc_buf size %zd got buffer %pK size %zd\n",
 731                       proc->pid, size, buffer, buffer_size);
 732
 733         has_page_addr =
 734                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 735         if (n == NULL) {
 736                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 737                         buffer_size = size; /* no room for other buffers */
 738                 else
 739                         buffer_size = size + sizeof(struct binder_buffer);
 740         }
 741         end_page_addr =
 742                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 743         if (end_page_addr > has_page_addr)
 744                 end_page_addr = has_page_addr;
 745         if (binder_update_page_range(proc, 1,
 746             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 747                 return NULL;
 748
 749         rb_erase(best_fit, &proc->free_buffers);
 750         buffer->free = 0;
 751         binder_insert_allocated_buffer(proc, buffer);
 752         if (buffer_size != size) {
 753                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 754
 755                 list_add(&new_buffer->entry, &buffer->entry);
 756                 new_buffer->free = 1;
 757                 binder_insert_free_buffer(proc, new_buffer);
 758         }
 759         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 760                      "%d: binder_alloc_buf size %zd got %pK\n",
 761                       proc->pid, size, buffer);
 762         buffer->data_size = data_size;
 763         buffer->offsets_size = offsets_size;
 764         buffer->async_transaction = is_async;
 765         if (is_async) {
 766                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 767                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 768                              "%d: binder_alloc_buf size %zd async free %zd\n",
 769                               proc->pid, size, proc->free_async_space);
 770         }
 771
 772         return buffer;
 773 }
 774
 775 static void *buffer_start_page(struct binder_buffer *buffer)
 776 {
 777         return (void *)((uintptr_t)buffer & PAGE_MASK);
 778 }
 779
 780 static void *buffer_end_page(struct binder_buffer *buffer)
 781 {
 782         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 783 }
 784
 785 static void binder_delete_free_buffer(struct binder_proc *proc,
 786                                       struct binder_buffer *buffer)
 787 {
 788         struct binder_buffer *prev, *next = NULL;
 789         int free_page_end = 1;
 790         int free_page_start = 1;
 791
 792         BUG_ON(proc->buffers.next == &buffer->entry);
 793         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 794         BUG_ON(!prev->free);
 795         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 796                 free_page_start = 0;
 797                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 798                         free_page_end = 0;
 799                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 800                              "%d: merge free, buffer %pK share page with %pK\n",
 801                               proc->pid, buffer, prev);
 802         }
 803
 804         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 805                 next = list_entry(buffer->entry.next,
 806                                   struct binder_buffer, entry);
 807                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 808                         free_page_end = 0;
 809                         if (buffer_start_page(next) ==
 810                             buffer_start_page(buffer))
 811                                 free_page_start = 0;
 812                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 813                                      "%d: merge free, buffer %pK share page with %pK\n",
 814                                       proc->pid, buffer, prev);
 815                 }
 816         }
 817         list_del(&buffer->entry);
 818         if (free_page_start || free_page_end) {
 819                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 820                              "%d: merge free, buffer %pK do not share page%s%s with %pK or %pK\n",
 821                              proc->pid, buffer, free_page_start ? "" : " end",
 822                              free_page_end ? "" : " start", prev, next);
 823                 binder_update_page_range(proc, 0, free_page_start ?
 824                         buffer_start_page(buffer) : buffer_end_page(buffer),
 825                         (free_page_end ? buffer_end_page(buffer) :
 826                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 827         }
 828 }
 829
 830 static void binder_free_buf(struct binder_proc *proc,
 831                             struct binder_buffer *buffer)
 832 {
 833         size_t size, buffer_size;
 834
 835         buffer_size = binder_buffer_size(proc, buffer);
 836
 837         size = ALIGN(buffer->data_size, sizeof(void *)) +
 838                 ALIGN(buffer->offsets_size, sizeof(void *));
 839
 840         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 841                      "%d: binder_free_buf %pK size %zd buffer_size %zd\n",
 842                       proc->pid, buffer, size, buffer_size);
 843
 844         BUG_ON(buffer->free);
 845         BUG_ON(size > buffer_size);
 846         BUG_ON(buffer->transaction != NULL);
 847         BUG_ON((void *)buffer < proc->buffer);
 848         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 849
 850         if (buffer->async_transaction) {
 851                 proc->free_async_space += size + sizeof(struct binder_buffer);
 852
 853                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 854                              "%d: binder_free_buf size %zd async free %zd\n",
 855                               proc->pid, size, proc->free_async_space);
 856         }
 857
 858         binder_update_page_range(proc, 0,
 859                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 860                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 861                 NULL);
 862         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 863         buffer->free = 1;
 864         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 865                 struct binder_buffer *next = list_entry(buffer->entry.next,
 866                                                 struct binder_buffer, entry);
 867
 868                 if (next->free) {
 869                         rb_erase(&next->rb_node, &proc->free_buffers);
 870                         binder_delete_free_buffer(proc, next);
 871                 }
 872         }
 873         if (proc->buffers.next != &buffer->entry) {
 874                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 875                                                 struct binder_buffer, entry);
 876
 877                 if (prev->free) {
 878                         binder_delete_free_buffer(proc, buffer);
 879                         rb_erase(&prev->rb_node, &proc->free_buffers);
 880                         buffer = prev;
 881                 }
 882         }
 883         binder_insert_free_buffer(proc, buffer);
 884 }
 885
 886 static struct binder_node *binder_get_node(struct binder_proc *proc,
 887                                            binder_uintptr_t ptr)
 888 {
 889         struct rb_node *n = proc->nodes.rb_node;
 890         struct binder_node *node;
 891
 892         while (n) {
 893                 node = rb_entry(n, struct binder_node, rb_node);
 894
 895                 if (ptr < node->ptr)
 896                         n = n->rb_left;
 897                 else if (ptr > node->ptr)
 898                         n = n->rb_right;
 899                 else
 900                         return node;
 901         }
 902         return NULL;
 903 }
 904
 905 static struct binder_node *binder_new_node(struct binder_proc *proc,
 906                                            binder_uintptr_t ptr,
 907                                            binder_uintptr_t cookie)
 908 {
 909         struct rb_node **p = &proc->nodes.rb_node;
 910         struct rb_node *parent = NULL;
 911         struct binder_node *node;
 912
 913         while (*p) {
 914                 parent = *p;
 915                 node = rb_entry(parent, struct binder_node, rb_node);
 916
 917                 if (ptr < node->ptr)
 918                         p = &(*p)->rb_left;
 919                 else if (ptr > node->ptr)
 920                         p = &(*p)->rb_right;
 921                 else
 922                         return NULL;
 923         }
 924
 925         node = kzalloc(sizeof(*node), GFP_KERNEL);
 926         if (node == NULL)
 927                 return NULL;
 928         binder_stats_created(BINDER_STAT_NODE);
 929         rb_link_node(&node->rb_node, parent, p);
 930         rb_insert_color(&node->rb_node, &proc->nodes);
 931         node->debug_id = ++binder_last_id;
 932         node->proc = proc;
 933         node->ptr = ptr;
 934         node->cookie = cookie;
 935         node->work.type = BINDER_WORK_NODE;
 936         INIT_LIST_HEAD(&node->work.entry);
 937         INIT_LIST_HEAD(&node->async_todo);
 938         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 939                      "%d:%d node %d u%016llx c%016llx created\n",
 940                      proc->pid, current->pid, node->debug_id,
 941                      (u64)node->ptr, (u64)node->cookie);
 942         return node;
 943 }
 944
 945 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 946                            struct list_head *target_list)
 947 {
 948         if (strong) {
 949                 if (internal) {
 950                         if (target_list == NULL &&
 951                             node->internal_strong_refs == 0 &&
 952                             !(node == binder_context_mgr_node &&
 953                             node->has_strong_ref)) {
 954                                 pr_err("invalid inc strong node for %d\n",
 955                                         node->debug_id);
 956                                 return -EINVAL;
 957                         }
 958                         node->internal_strong_refs++;
 959                 } else
 960                         node->local_strong_refs++;
 961                 if (!node->has_strong_ref && target_list) {
 962                         list_del_init(&node->work.entry);
 963                         list_add_tail(&node->work.entry, target_list);
 964                 }
 965         } else {
 966                 if (!internal)
 967                         node->local_weak_refs++;
 968                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 969                         if (target_list == NULL) {
 970                                 pr_err("invalid inc weak node for %d\n",
 971                                         node->debug_id);
 972                                 return -EINVAL;
 973                         }
 974                         list_add_tail(&node->work.entry, target_list);
 975                 }
 976         }
 977         return 0;
 978 }
 979
 980 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 981 {
 982         if (strong) {
 983                 if (internal)
 984                         node->internal_strong_refs--;
 985                 else
 986                         node->local_strong_refs--;
 987                 if (node->local_strong_refs || node->internal_strong_refs)
 988                         return 0;
 989         } else {
 990                 if (!internal)
 991                         node->local_weak_refs--;
 992                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 993                         return 0;
 994         }
 995         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 996                 if (list_empty(&node->work.entry)) {
 997                         list_add_tail(&node->work.entry, &node->proc->todo);
 998                         wake_up_interruptible(&node->proc->wait);
 999                 }
1000         } else {
1001                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1002                     !node->local_weak_refs) {
1003                         list_del_init(&node->work.entry);
1004                         if (node->proc) {
1005                                 rb_erase(&node->rb_node, &node->proc->nodes);
1006                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1007                                              "refless node %d deleted\n",
1008                                              node->debug_id);
1009                         } else {
1010                                 hlist_del(&node->dead_node);
1011                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1012                                              "dead node %d deleted\n",
1013                                              node->debug_id);
1014                         }
1015                         kfree(node);
1016                         binder_stats_deleted(BINDER_STAT_NODE);
1017                 }
1018         }
1019
1020         return 0;
1021 }
1022
1023
1024 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1025                                          u32 desc, bool need_strong_ref)
1026 {
1027         struct rb_node *n = proc->refs_by_desc.rb_node;
1028         struct binder_ref *ref;
1029
1030         while (n) {
1031                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1032
1033                 if (desc < ref->desc) {
1034                         n = n->rb_left;
1035                 } else if (desc > ref->desc) {
1036                         n = n->rb_right;
1037                 } else if (need_strong_ref && !ref->strong) {
1038                         binder_user_error("tried to use weak ref as strong ref\n");
1039                         return NULL;
1040                 } else {
1041                         return ref;
1042                 }
1043         }
1044         return NULL;
1045 }
1046
1047 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1048                                                   struct binder_node *node)
1049 {
1050         struct rb_node *n;
1051         struct rb_node **p = &proc->refs_by_node.rb_node;
1052         struct rb_node *parent = NULL;
1053         struct binder_ref *ref, *new_ref;
1054
1055         while (*p) {
1056                 parent = *p;
1057                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1058
1059                 if (node < ref->node)
1060                         p = &(*p)->rb_left;
1061                 else if (node > ref->node)
1062                         p = &(*p)->rb_right;
1063                 else
1064                         return ref;
1065         }
1066         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1067         if (new_ref == NULL)
1068                 return NULL;
1069         binder_stats_created(BINDER_STAT_REF);
1070         new_ref->debug_id = ++binder_last_id;
1071         new_ref->proc = proc;
1072         new_ref->node = node;
1073         rb_link_node(&new_ref->rb_node_node, parent, p);
1074         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1075
1076         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1077         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1078                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1079                 if (ref->desc > new_ref->desc)
1080                         break;
1081                 new_ref->desc = ref->desc + 1;
1082         }
1083
1084         p = &proc->refs_by_desc.rb_node;
1085         while (*p) {
1086                 parent = *p;
1087                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1088
1089                 if (new_ref->desc < ref->desc)
1090                         p = &(*p)->rb_left;
1091                 else if (new_ref->desc > ref->desc)
1092                         p = &(*p)->rb_right;
1093                 else
1094                         BUG();
1095         }
1096         rb_link_node(&new_ref->rb_node_desc, parent, p);
1097         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1098         if (node) {
1099                 hlist_add_head(&new_ref->node_entry, &node->refs);
1100
1101                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1102                              "%d new ref %d desc %d for node %d\n",
1103                               proc->pid, new_ref->debug_id, new_ref->desc,
1104                               node->debug_id);
1105         } else {
1106                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1107                              "%d new ref %d desc %d for dead node\n",
1108                               proc->pid, new_ref->debug_id, new_ref->desc);
1109         }
1110         return new_ref;
1111 }
1112
1113 static void binder_delete_ref(struct binder_ref *ref)
1114 {
1115         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1116                      "%d delete ref %d desc %d for node %d\n",
1117                       ref->proc->pid, ref->debug_id, ref->desc,
1118                       ref->node->debug_id);
1119
1120         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1121         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1122         if (ref->strong)
1123                 binder_dec_node(ref->node, 1, 1);
1124         hlist_del(&ref->node_entry);
1125         binder_dec_node(ref->node, 0, 1);
1126         if (ref->death) {
1127                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1128                              "%d delete ref %d desc %d has death notification\n",
1129                               ref->proc->pid, ref->debug_id, ref->desc);
1130                 list_del(&ref->death->work.entry);
1131                 kfree(ref->death);
1132                 binder_stats_deleted(BINDER_STAT_DEATH);
1133         }
1134         kfree(ref);
1135         binder_stats_deleted(BINDER_STAT_REF);
1136 }
1137
1138 static int binder_inc_ref(struct binder_ref *ref, int strong,
1139                           struct list_head *target_list)
1140 {
1141         int ret;
1142
1143         if (strong) {
1144                 if (ref->strong == 0) {
1145                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1146                         if (ret)
1147                                 return ret;
1148                 }
1149                 ref->strong++;
1150         } else {
1151                 if (ref->weak == 0) {
1152                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1153                         if (ret)
1154                                 return ret;
1155                 }
1156                 ref->weak++;
1157         }
1158         return 0;
1159 }
1160
1161
1162 static int binder_dec_ref(struct binder_ref *ref, int strong)
1163 {
1164         if (strong) {
1165                 if (ref->strong == 0) {
1166                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1167                                           ref->proc->pid, ref->debug_id,
1168                                           ref->desc, ref->strong, ref->weak);
1169                         return -EINVAL;
1170                 }
1171                 ref->strong--;
1172                 if (ref->strong == 0) {
1173                         int ret;
1174
1175                         ret = binder_dec_node(ref->node, strong, 1);
1176                         if (ret)
1177                                 return ret;
1178                 }
1179         } else {
1180                 if (ref->weak == 0) {
1181                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1182                                           ref->proc->pid, ref->debug_id,
1183                                           ref->desc, ref->strong, ref->weak);
1184                         return -EINVAL;
1185                 }
1186                 ref->weak--;
1187         }
1188         if (ref->strong == 0 && ref->weak == 0)
1189                 binder_delete_ref(ref);
1190         return 0;
1191 }
1192
1193 static void binder_pop_transaction(struct binder_thread *target_thread,
1194                                    struct binder_transaction *t)
1195 {
1196         if (target_thread) {
1197                 BUG_ON(target_thread->transaction_stack != t);
1198                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1199                 target_thread->transaction_stack =
1200                         target_thread->transaction_stack->from_parent;
1201                 t->from = NULL;
1202         }
1203         t->need_reply = 0;
1204         if (t->buffer)
1205                 t->buffer->transaction = NULL;
1206         kfree(t);
1207         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1208 }
1209
1210 static void binder_send_failed_reply(struct binder_transaction *t,
1211                                      uint32_t error_code)
1212 {
1213         struct binder_thread *target_thread;
1214         struct binder_transaction *next;
1215
1216         BUG_ON(t->flags & TF_ONE_WAY);
1217         while (1) {
1218                 target_thread = t->from;
1219                 if (target_thread) {
1220                         if (target_thread->return_error != BR_OK &&
1221                            target_thread->return_error2 == BR_OK) {
1222                                 target_thread->return_error2 =
1223                                         target_thread->return_error;
1224                                 target_thread->return_error = BR_OK;
1225                         }
1226                         if (target_thread->return_error == BR_OK) {
1227                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1228                                              "send failed reply for transaction %d to %d:%d\n",
1229                                               t->debug_id,
1230                                               target_thread->proc->pid,
1231                                               target_thread->pid);
1232
1233                                 binder_pop_transaction(target_thread, t);
1234                                 target_thread->return_error = error_code;
1235                                 wake_up_interruptible(&target_thread->wait);
1236                         } else {
1237                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1238                                         target_thread->proc->pid,
1239                                         target_thread->pid,
1240                                         target_thread->return_error);
1241                         }
1242                         return;
1243                 }
1244                 next = t->from_parent;
1245
1246                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1247                              "send failed reply for transaction %d, target dead\n",
1248                              t->debug_id);
1249
1250                 binder_pop_transaction(target_thread, t);
1251                 if (next == NULL) {
1252                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1253                                      "reply failed, no target thread at root\n");
1254                         return;
1255                 }
1256                 t = next;
1257                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1258                              "reply failed, no target thread -- retry %d\n",
1259                               t->debug_id);
1260         }
1261 }
1262
1263 static void binder_transaction_buffer_release(struct binder_proc *proc,
1264                                               struct binder_buffer *buffer,
1265                                               binder_size_t *failed_at)
1266 {
1267         binder_size_t *offp, *off_end;
1268         int debug_id = buffer->debug_id;
1269
1270         binder_debug(BINDER_DEBUG_TRANSACTION,
1271                      "%d buffer release %d, size %zd-%zd, failed at %pK\n",
1272                      proc->pid, buffer->debug_id,
1273                      buffer->data_size, buffer->offsets_size, failed_at);
1274
1275         if (buffer->target_node)
1276                 binder_dec_node(buffer->target_node, 1, 0);
1277
1278         offp = (binder_size_t *)(buffer->data +
1279                                  ALIGN(buffer->data_size, sizeof(void *)));
1280         if (failed_at)
1281                 off_end = failed_at;
1282         else
1283                 off_end = (void *)offp + buffer->offsets_size;
1284         for (; offp < off_end; offp++) {
1285                 struct flat_binder_object *fp;
1286
1287                 if (*offp > buffer->data_size - sizeof(*fp) ||
1288                     buffer->data_size < sizeof(*fp) ||
1289                     !IS_ALIGNED(*offp, sizeof(u32))) {
1290                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1291                                debug_id, (u64)*offp, buffer->data_size);
1292                         continue;
1293                 }
1294                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1295                 switch (fp->type) {
1296                 case BINDER_TYPE_BINDER:
1297                 case BINDER_TYPE_WEAK_BINDER: {
1298                         struct binder_node *node = binder_get_node(proc, fp->binder);
1299
1300                         if (node == NULL) {
1301                                 pr_err("transaction release %d bad node %016llx\n",
1302                                        debug_id, (u64)fp->binder);
1303                                 break;
1304                         }
1305                         binder_debug(BINDER_DEBUG_TRANSACTION,
1306                                      "        node %d u%016llx\n",
1307                                      node->debug_id, (u64)node->ptr);
1308                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1309                 } break;
1310                 case BINDER_TYPE_HANDLE:
1311                 case BINDER_TYPE_WEAK_HANDLE: {
1312                         struct binder_ref *ref;
1313
1314                         ref = binder_get_ref(proc, fp->handle,
1315                                              fp->type == BINDER_TYPE_HANDLE);
1316
1317                         if (ref == NULL) {
1318                                 pr_err("transaction release %d bad handle %d\n",
1319                                  debug_id, fp->handle);
1320                                 break;
1321                         }
1322                         binder_debug(BINDER_DEBUG_TRANSACTION,
1323                                      "        ref %d desc %d (node %d)\n",
1324                                      ref->debug_id, ref->desc, ref->node->debug_id);
1325                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1326                 } break;
1327
1328                 case BINDER_TYPE_FD:
1329                         binder_debug(BINDER_DEBUG_TRANSACTION,
1330                                      "        fd %d\n", fp->handle);
1331                         if (failed_at)
1332                                 task_close_fd(proc, fp->handle);
1333                         break;
1334
1335                 default:
1336                         pr_err("transaction release %d bad object type %x\n",
1337                                 debug_id, fp->type);
1338                         break;
1339                 }
1340         }
1341 }
1342
1343 static void binder_transaction(struct binder_proc *proc,
1344                                struct binder_thread *thread,
1345                                struct binder_transaction_data *tr, int reply)
1346 {
1347         struct binder_transaction *t;
1348         struct binder_work *tcomplete;
1349         binder_size_t *offp, *off_end;
1350         binder_size_t off_min;
1351         struct binder_proc *target_proc;
1352         struct binder_thread *target_thread = NULL;
1353         struct binder_node *target_node = NULL;
1354         struct list_head *target_list;
1355         wait_queue_head_t *target_wait;
1356         struct binder_transaction *in_reply_to = NULL;
1357         struct binder_transaction_log_entry *e;
1358         uint32_t return_error;
1359
1360         e = binder_transaction_log_add(&binder_transaction_log);
1361         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1362         e->from_proc = proc->pid;
1363         e->from_thread = thread->pid;
1364         e->target_handle = tr->target.handle;
1365         e->data_size = tr->data_size;
1366         e->offsets_size = tr->offsets_size;
1367
1368         if (reply) {
1369                 in_reply_to = thread->transaction_stack;
1370                 if (in_reply_to == NULL) {
1371                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1372                                           proc->pid, thread->pid);
1373                         return_error = BR_FAILED_REPLY;
1374                         goto err_empty_call_stack;
1375                 }
1376                 binder_set_nice(in_reply_to->saved_priority);
1377                 if (in_reply_to->to_thread != thread) {
1378                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1379                                 proc->pid, thread->pid, in_reply_to->debug_id,
1380                                 in_reply_to->to_proc ?
1381                                 in_reply_to->to_proc->pid : 0,
1382                                 in_reply_to->to_thread ?
1383                                 in_reply_to->to_thread->pid : 0);
1384                         return_error = BR_FAILED_REPLY;
1385                         in_reply_to = NULL;
1386                         goto err_bad_call_stack;
1387                 }
1388                 thread->transaction_stack = in_reply_to->to_parent;
1389                 target_thread = in_reply_to->from;
1390                 if (target_thread == NULL) {
1391                         return_error = BR_DEAD_REPLY;
1392                         goto err_dead_binder;
1393                 }
1394                 if (target_thread->transaction_stack != in_reply_to) {
1395                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1396                                 proc->pid, thread->pid,
1397                                 target_thread->transaction_stack ?
1398                                 target_thread->transaction_stack->debug_id : 0,
1399                                 in_reply_to->debug_id);
1400                         return_error = BR_FAILED_REPLY;
1401                         in_reply_to = NULL;
1402                         target_thread = NULL;
1403                         goto err_dead_binder;
1404                 }
1405                 target_proc = target_thread->proc;
1406         } else {
1407                 if (tr->target.handle) {
1408                         struct binder_ref *ref;
1409
1410                         ref = binder_get_ref(proc, tr->target.handle, true);
1411                         if (ref == NULL) {
1412                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1413                                         proc->pid, thread->pid);
1414                                 return_error = BR_FAILED_REPLY;
1415                                 goto err_invalid_target_handle;
1416                         }
1417                         target_node = ref->node;
1418                 } else {
1419                         target_node = binder_context_mgr_node;
1420                         if (target_node == NULL) {
1421                                 return_error = BR_DEAD_REPLY;
1422                                 goto err_no_context_mgr_node;
1423                         }
1424                 }
1425                 e->to_node = target_node->debug_id;
1426                 target_proc = target_node->proc;
1427                 if (target_proc == NULL) {
1428                         return_error = BR_DEAD_REPLY;
1429                         goto err_dead_binder;
1430                 }
1431                 if (WARN_ON(proc == target_proc)) {
1432                         return_error = BR_FAILED_REPLY;
1433                         goto err_invalid_target_handle;
1434                 }
1435                 if (security_binder_transaction(proc->cred,
1436                                                 target_proc->cred) < 0) {
1437                         return_error = BR_FAILED_REPLY;
1438                         goto err_invalid_target_handle;
1439                 }
1440                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1441                         struct binder_transaction *tmp;
1442
1443                         tmp = thread->transaction_stack;
1444                         if (tmp->to_thread != thread) {
1445                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1446                                         proc->pid, thread->pid, tmp->debug_id,
1447                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1448                                         tmp->to_thread ?
1449                                         tmp->to_thread->pid : 0);
1450                                 return_error = BR_FAILED_REPLY;
1451                                 goto err_bad_call_stack;
1452                         }
1453                         while (tmp) {
1454                                 if (tmp->from && tmp->from->proc == target_proc)
1455                                         target_thread = tmp->from;
1456                                 tmp = tmp->from_parent;
1457                         }
1458                 }
1459         }
1460         if (target_thread) {
1461                 e->to_thread = target_thread->pid;
1462                 target_list = &target_thread->todo;
1463                 target_wait = &target_thread->wait;
1464         } else {
1465                 target_list = &target_proc->todo;
1466                 target_wait = &target_proc->wait;
1467         }
1468         e->to_proc = target_proc->pid;
1469
1470         /* TODO: reuse incoming transaction for reply */
1471         t = kzalloc(sizeof(*t), GFP_KERNEL);
1472         if (t == NULL) {
1473                 return_error = BR_FAILED_REPLY;
1474                 goto err_alloc_t_failed;
1475         }
1476         binder_stats_created(BINDER_STAT_TRANSACTION);
1477
1478         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1479         if (tcomplete == NULL) {
1480                 return_error = BR_FAILED_REPLY;
1481                 goto err_alloc_tcomplete_failed;
1482         }
1483         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1484
1485         t->debug_id = ++binder_last_id;
1486         e->debug_id = t->debug_id;
1487
1488         if (reply)
1489                 binder_debug(BINDER_DEBUG_TRANSACTION,
1490                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1491                              proc->pid, thread->pid, t->debug_id,
1492                              target_proc->pid, target_thread->pid,
1493                              (u64)tr->data.ptr.buffer,
1494                              (u64)tr->data.ptr.offsets,
1495                              (u64)tr->data_size, (u64)tr->offsets_size);
1496         else
1497                 binder_debug(BINDER_DEBUG_TRANSACTION,
1498                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1499                              proc->pid, thread->pid, t->debug_id,
1500                              target_proc->pid, target_node->debug_id,
1501                              (u64)tr->data.ptr.buffer,
1502                              (u64)tr->data.ptr.offsets,
1503                              (u64)tr->data_size, (u64)tr->offsets_size);
1504
1505         if (!reply && !(tr->flags & TF_ONE_WAY))
1506                 t->from = thread;
1507         else
1508                 t->from = NULL;
1509         t->sender_euid = task_euid(proc->tsk);
1510         t->to_proc = target_proc;
1511         t->to_thread = target_thread;
1512         t->code = tr->code;
1513         t->flags = tr->flags;
1514         t->priority = task_nice(current);
1515
1516         trace_binder_transaction(reply, t, target_node);
1517
1518         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1519                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1520         if (t->buffer == NULL) {
1521                 return_error = BR_FAILED_REPLY;
1522                 goto err_binder_alloc_buf_failed;
1523         }
1524         t->buffer->allow_user_free = 0;
1525         t->buffer->debug_id = t->debug_id;
1526         t->buffer->transaction = t;
1527         t->buffer->target_node = target_node;
1528         trace_binder_transaction_alloc_buf(t->buffer);
1529         if (target_node)
1530                 binder_inc_node(target_node, 1, 0, NULL);
1531
1532         offp = (binder_size_t *)(t->buffer->data +
1533                                  ALIGN(tr->data_size, sizeof(void *)));
1534
1535         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1536                            tr->data.ptr.buffer, tr->data_size)) {
1537                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1538                                 proc->pid, thread->pid);
1539                 return_error = BR_FAILED_REPLY;
1540                 goto err_copy_data_failed;
1541         }
1542         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1543                            tr->data.ptr.offsets, tr->offsets_size)) {
1544                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1545                                 proc->pid, thread->pid);
1546                 return_error = BR_FAILED_REPLY;
1547                 goto err_copy_data_failed;
1548         }
1549         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1550                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1551                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1552                 return_error = BR_FAILED_REPLY;
1553                 goto err_bad_offset;
1554         }
1555         off_end = (void *)offp + tr->offsets_size;
1556         off_min = 0;
1557         for (; offp < off_end; offp++) {
1558                 struct flat_binder_object *fp;
1559
1560                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1561                     *offp < off_min ||
1562                     t->buffer->data_size < sizeof(*fp) ||
1563                     !IS_ALIGNED(*offp, sizeof(u32))) {
1564                         binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
1565                                           proc->pid, thread->pid, (u64)*offp,
1566                                           (u64)off_min,
1567                                           (u64)(t->buffer->data_size -
1568                                           sizeof(*fp)));
1569                         return_error = BR_FAILED_REPLY;
1570                         goto err_bad_offset;
1571                 }
1572                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1573                 off_min = *offp + sizeof(struct flat_binder_object);
1574                 switch (fp->type) {
1575                 case BINDER_TYPE_BINDER:
1576                 case BINDER_TYPE_WEAK_BINDER: {
1577                         struct binder_ref *ref;
1578                         struct binder_node *node = binder_get_node(proc, fp->binder);
1579
1580                         if (node == NULL) {
1581                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1582                                 if (node == NULL) {
1583                                         return_error = BR_FAILED_REPLY;
1584                                         goto err_binder_new_node_failed;
1585                                 }
1586                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1587                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1588                         }
1589                         if (fp->cookie != node->cookie) {
1590                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1591                                         proc->pid, thread->pid,
1592                                         (u64)fp->binder, node->debug_id,
1593                                         (u64)fp->cookie, (u64)node->cookie);
1594                                 return_error = BR_FAILED_REPLY;
1595                                 goto err_binder_get_ref_for_node_failed;
1596                         }
1597                         if (security_binder_transfer_binder(proc->cred,
1598                                                             target_proc->cred)) {
1599                                 return_error = BR_FAILED_REPLY;
1600                                 goto err_binder_get_ref_for_node_failed;
1601                         }
1602                         ref = binder_get_ref_for_node(target_proc, node);
1603                         if (ref == NULL) {
1604                                 return_error = BR_FAILED_REPLY;
1605                                 goto err_binder_get_ref_for_node_failed;
1606                         }
1607                         if (fp->type == BINDER_TYPE_BINDER)
1608                                 fp->type = BINDER_TYPE_HANDLE;
1609                         else
1610                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1611                         fp->binder = 0;
1612                         fp->handle = ref->desc;
1613                         fp->cookie = 0;
1614                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1615                                        &thread->todo);
1616
1617                         trace_binder_transaction_node_to_ref(t, node, ref);
1618                         binder_debug(BINDER_DEBUG_TRANSACTION,
1619                                      "        node %d u%016llx -> ref %d desc %d\n",
1620                                      node->debug_id, (u64)node->ptr,
1621                                      ref->debug_id, ref->desc);
1622                 } break;
1623                 case BINDER_TYPE_HANDLE:
1624                 case BINDER_TYPE_WEAK_HANDLE: {
1625                         struct binder_ref *ref;
1626
1627                         ref = binder_get_ref(proc, fp->handle,
1628                                              fp->type == BINDER_TYPE_HANDLE);
1629
1630                         if (ref == NULL) {
1631                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1632                                                 proc->pid,
1633                                                 thread->pid, fp->handle);
1634                                 return_error = BR_FAILED_REPLY;
1635                                 goto err_binder_get_ref_failed;
1636                         }
1637                         if (security_binder_transfer_binder(proc->cred,
1638                                                             target_proc->cred)) {
1639                                 return_error = BR_FAILED_REPLY;
1640                                 goto err_binder_get_ref_failed;
1641                         }
1642                         if (ref->node->proc == target_proc) {
1643                                 if (fp->type == BINDER_TYPE_HANDLE)
1644                                         fp->type = BINDER_TYPE_BINDER;
1645                                 else
1646                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1647                                 fp->binder = ref->node->ptr;
1648                                 fp->cookie = ref->node->cookie;
1649                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1650                                 trace_binder_transaction_ref_to_node(t, ref);
1651                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1652                                              "        ref %d desc %d -> node %d u%016llx\n",
1653                                              ref->debug_id, ref->desc, ref->node->debug_id,
1654                                              (u64)ref->node->ptr);
1655                         } else {
1656                                 struct binder_ref *new_ref;
1657
1658                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1659                                 if (new_ref == NULL) {
1660                                         return_error = BR_FAILED_REPLY;
1661                                         goto err_binder_get_ref_for_node_failed;
1662                                 }
1663                                 fp->binder = 0;
1664                                 fp->handle = new_ref->desc;
1665                                 fp->cookie = 0;
1666                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1667                                 trace_binder_transaction_ref_to_ref(t, ref,
1668                                                                     new_ref);
1669                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1670                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1671                                              ref->debug_id, ref->desc, new_ref->debug_id,
1672                                              new_ref->desc, ref->node->debug_id);
1673                         }
1674                 } break;
1675
1676                 case BINDER_TYPE_FD: {
1677                         int target_fd;
1678                         struct file *file;
1679
1680                         if (reply) {
1681                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1682                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1683                                                 proc->pid, thread->pid, fp->handle);
1684                                         return_error = BR_FAILED_REPLY;
1685                                         goto err_fd_not_allowed;
1686                                 }
1687                         } else if (!target_node->accept_fds) {
1688                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1689                                         proc->pid, thread->pid, fp->handle);
1690                                 return_error = BR_FAILED_REPLY;
1691                                 goto err_fd_not_allowed;
1692                         }
1693
1694                         file = fget(fp->handle);
1695                         if (file == NULL) {
1696                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1697                                         proc->pid, thread->pid, fp->handle);
1698                                 return_error = BR_FAILED_REPLY;
1699                                 goto err_fget_failed;
1700                         }
1701                         if (security_binder_transfer_file(proc->cred,
1702                                                           target_proc->cred,
1703                                                           file) < 0) {
1704                                 fput(file);
1705                                 return_error = BR_FAILED_REPLY;
1706                                 goto err_get_unused_fd_failed;
1707                         }
1708                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1709                         if (target_fd < 0) {
1710                                 fput(file);
1711                                 return_error = BR_FAILED_REPLY;
1712                                 goto err_get_unused_fd_failed;
1713                         }
1714                         task_fd_install(target_proc, target_fd, file);
1715                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1716                         binder_debug(BINDER_DEBUG_TRANSACTION,
1717                                      "        fd %d -> %d\n", fp->handle, target_fd);
1718                         /* TODO: fput? */
1719                         fp->binder = 0;
1720                         fp->handle = target_fd;
1721                 } break;
1722
1723                 default:
1724                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1725                                 proc->pid, thread->pid, fp->type);
1726                         return_error = BR_FAILED_REPLY;
1727                         goto err_bad_object_type;
1728                 }
1729         }
1730         if (reply) {
1731                 BUG_ON(t->buffer->async_transaction != 0);
1732                 binder_pop_transaction(target_thread, in_reply_to);
1733         } else if (!(t->flags & TF_ONE_WAY)) {
1734                 BUG_ON(t->buffer->async_transaction != 0);
1735                 t->need_reply = 1;
1736                 t->from_parent = thread->transaction_stack;
1737                 thread->transaction_stack = t;
1738         } else {
1739                 BUG_ON(target_node == NULL);
1740                 BUG_ON(t->buffer->async_transaction != 1);
1741                 if (target_node->has_async_transaction) {
1742                         target_list = &target_node->async_todo;
1743                         target_wait = NULL;
1744                 } else
1745                         target_node->has_async_transaction = 1;
1746         }
1747         t->work.type = BINDER_WORK_TRANSACTION;
1748         list_add_tail(&t->work.entry, target_list);
1749         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1750         list_add_tail(&tcomplete->entry, &thread->todo);
1751         if (target_wait) {
1752                 if (reply || !(t->flags & TF_ONE_WAY))
1753                         wake_up_interruptible_sync(target_wait);
1754                 else
1755                         wake_up_interruptible(target_wait);
1756         }
1757         return;
1758
1759 err_get_unused_fd_failed:
1760 err_fget_failed:
1761 err_fd_not_allowed:
1762 err_binder_get_ref_for_node_failed:
1763 err_binder_get_ref_failed:
1764 err_binder_new_node_failed:
1765 err_bad_object_type:
1766 err_bad_offset:
1767 err_copy_data_failed:
1768         trace_binder_transaction_failed_buffer_release(t->buffer);
1769         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1770         t->buffer->transaction = NULL;
1771         binder_free_buf(target_proc, t->buffer);
1772 err_binder_alloc_buf_failed:
1773         kfree(tcomplete);
1774         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1775 err_alloc_tcomplete_failed:
1776         kfree(t);
1777         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1778 err_alloc_t_failed:
1779 err_bad_call_stack:
1780 err_empty_call_stack:
1781 err_dead_binder:
1782 err_invalid_target_handle:
1783 err_no_context_mgr_node:
1784         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1785                      "%d:%d transaction failed %d, size %lld-%lld\n",
1786                      proc->pid, thread->pid, return_error,
1787                      (u64)tr->data_size, (u64)tr->offsets_size);
1788
1789         {
1790                 struct binder_transaction_log_entry *fe;
1791
1792                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1793                 *fe = *e;
1794         }
1795
1796         BUG_ON(thread->return_error != BR_OK);
1797         if (in_reply_to) {
1798                 thread->return_error = BR_TRANSACTION_COMPLETE;
1799                 binder_send_failed_reply(in_reply_to, return_error);
1800         } else
1801                 thread->return_error = return_error;
1802 }
1803
1804 static int binder_thread_write(struct binder_proc *proc,
1805                         struct binder_thread *thread,
1806                         binder_uintptr_t binder_buffer, size_t size,
1807                         binder_size_t *consumed)
1808 {
1809         uint32_t cmd;
1810         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1811         void __user *ptr = buffer + *consumed;
1812         void __user *end = buffer + size;
1813
1814         while (ptr < end && thread->return_error == BR_OK) {
1815                 if (get_user(cmd, (uint32_t __user *)ptr))
1816                         return -EFAULT;
1817                 ptr += sizeof(uint32_t);
1818                 trace_binder_command(cmd);
1819                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1820                         binder_stats.bc[_IOC_NR(cmd)]++;
1821                         proc->stats.bc[_IOC_NR(cmd)]++;
1822                         thread->stats.bc[_IOC_NR(cmd)]++;
1823                 }
1824                 switch (cmd) {
1825                 case BC_INCREFS:
1826                 case BC_ACQUIRE:
1827                 case BC_RELEASE:
1828                 case BC_DECREFS: {
1829                         uint32_t target;
1830                         struct binder_ref *ref;
1831                         const char *debug_string;
1832
1833                         if (get_user(target, (uint32_t __user *)ptr))
1834                                 return -EFAULT;
1835                         ptr += sizeof(uint32_t);
1836                         if (target == 0 && binder_context_mgr_node &&
1837                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1838                                 if (binder_context_mgr_node->proc == proc) {
1839                                         binder_user_error("%d:%d context manager tried to acquire desc 0\n",
1840                                                           proc->pid, thread->pid);
1841                                         return -EINVAL;
1842                                 }
1843                                 ref = binder_get_ref_for_node(proc,
1844                                                binder_context_mgr_node);
1845                                 if (ref->desc != target) {
1846                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1847                                                 proc->pid, thread->pid,
1848                                                 ref->desc);
1849                                 }
1850                         } else
1851                                 ref = binder_get_ref(proc, target,
1852                                                      cmd == BC_ACQUIRE ||
1853                                                      cmd == BC_RELEASE);
1854                         if (ref == NULL) {
1855                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1856                                         proc->pid, thread->pid, target);
1857                                 break;
1858                         }
1859                         switch (cmd) {
1860                         case BC_INCREFS:
1861                                 debug_string = "IncRefs";
1862                                 binder_inc_ref(ref, 0, NULL);
1863                                 break;
1864                         case BC_ACQUIRE:
1865                                 debug_string = "Acquire";
1866                                 binder_inc_ref(ref, 1, NULL);
1867                                 break;
1868                         case BC_RELEASE:
1869                                 debug_string = "Release";
1870                                 binder_dec_ref(ref, 1);
1871                                 break;
1872                         case BC_DECREFS:
1873                         default:
1874                                 debug_string = "DecRefs";
1875                                 binder_dec_ref(ref, 0);
1876                                 break;
1877                         }
1878                         binder_debug(BINDER_DEBUG_USER_REFS,
1879                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1880                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1881                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1882                         break;
1883                 }
1884                 case BC_INCREFS_DONE:
1885                 case BC_ACQUIRE_DONE: {
1886                         binder_uintptr_t node_ptr;
1887                         binder_uintptr_t cookie;
1888                         struct binder_node *node;
1889
1890                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1891                                 return -EFAULT;
1892                         ptr += sizeof(binder_uintptr_t);
1893                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1894                                 return -EFAULT;
1895                         ptr += sizeof(binder_uintptr_t);
1896                         node = binder_get_node(proc, node_ptr);
1897                         if (node == NULL) {
1898                                 binder_user_error("%d:%d %s u%016llx no match\n",
1899                                         proc->pid, thread->pid,
1900                                         cmd == BC_INCREFS_DONE ?
1901                                         "BC_INCREFS_DONE" :
1902                                         "BC_ACQUIRE_DONE",
1903                                         (u64)node_ptr);
1904                                 break;
1905                         }
1906                         if (cookie != node->cookie) {
1907                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1908                                         proc->pid, thread->pid,
1909                                         cmd == BC_INCREFS_DONE ?
1910                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1911                                         (u64)node_ptr, node->debug_id,
1912                                         (u64)cookie, (u64)node->cookie);
1913                                 break;
1914                         }
1915                         if (cmd == BC_ACQUIRE_DONE) {
1916                                 if (node->pending_strong_ref == 0) {
1917                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1918                                                 proc->pid, thread->pid,
1919                                                 node->debug_id);
1920                                         break;
1921                                 }
1922                                 node->pending_strong_ref = 0;
1923                         } else {
1924                                 if (node->pending_weak_ref == 0) {
1925                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1926                                                 proc->pid, thread->pid,
1927                                                 node->debug_id);
1928                                         break;
1929                                 }
1930                                 node->pending_weak_ref = 0;
1931                         }
1932                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1933                         binder_debug(BINDER_DEBUG_USER_REFS,
1934                                      "%d:%d %s node %d ls %d lw %d\n",
1935                                      proc->pid, thread->pid,
1936                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1937                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1938                         break;
1939                 }
1940                 case BC_ATTEMPT_ACQUIRE:
1941                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1942                         return -EINVAL;
1943                 case BC_ACQUIRE_RESULT:
1944                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1945                         return -EINVAL;
1946
1947                 case BC_FREE_BUFFER: {
1948                         binder_uintptr_t data_ptr;
1949                         struct binder_buffer *buffer;
1950
1951                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1952                                 return -EFAULT;
1953                         ptr += sizeof(binder_uintptr_t);
1954
1955                         buffer = binder_buffer_lookup(proc, data_ptr);
1956                         if (buffer == NULL) {
1957                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1958                                         proc->pid, thread->pid, (u64)data_ptr);
1959                                 break;
1960                         }
1961                         if (!buffer->allow_user_free) {
1962                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1963                                         proc->pid, thread->pid, (u64)data_ptr);
1964                                 break;
1965                         }
1966                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1967                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1968                                      proc->pid, thread->pid, (u64)data_ptr,
1969                                      buffer->debug_id,
1970                                      buffer->transaction ? "active" : "finished");
1971
1972                         if (buffer->transaction) {
1973                                 buffer->transaction->buffer = NULL;
1974                                 buffer->transaction = NULL;
1975                         }
1976                         if (buffer->async_transaction && buffer->target_node) {
1977                                 BUG_ON(!buffer->target_node->has_async_transaction);
1978                                 if (list_empty(&buffer->target_node->async_todo))
1979                                         buffer->target_node->has_async_transaction = 0;
1980                                 else
1981                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1982                         }
1983                         trace_binder_transaction_buffer_release(buffer);
1984                         binder_transaction_buffer_release(proc, buffer, NULL);
1985                         binder_free_buf(proc, buffer);
1986                         break;
1987                 }
1988
1989                 case BC_TRANSACTION:
1990                 case BC_REPLY: {
1991                         struct binder_transaction_data tr;
1992
1993                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1994                                 return -EFAULT;
1995                         ptr += sizeof(tr);
1996                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1997                         break;
1998                 }
1999
2000                 case BC_REGISTER_LOOPER:
2001                         binder_debug(BINDER_DEBUG_THREADS,
2002                                      "%d:%d BC_REGISTER_LOOPER\n",
2003                                      proc->pid, thread->pid);
2004                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
2005                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2006                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
2007                                         proc->pid, thread->pid);
2008                         } else if (proc->requested_threads == 0) {
2009                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2010                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
2011                                         proc->pid, thread->pid);
2012                         } else {
2013                                 proc->requested_threads--;
2014                                 proc->requested_threads_started++;
2015                         }
2016                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
2017                         break;
2018                 case BC_ENTER_LOOPER:
2019                         binder_debug(BINDER_DEBUG_THREADS,
2020                                      "%d:%d BC_ENTER_LOOPER\n",
2021                                      proc->pid, thread->pid);
2022                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
2023                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2024                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
2025                                         proc->pid, thread->pid);
2026                         }
2027                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
2028                         break;
2029                 case BC_EXIT_LOOPER:
2030                         binder_debug(BINDER_DEBUG_THREADS,
2031                                      "%d:%d BC_EXIT_LOOPER\n",
2032                                      proc->pid, thread->pid);
2033                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
2034                         break;
2035
2036                 case BC_REQUEST_DEATH_NOTIFICATION:
2037                 case BC_CLEAR_DEATH_NOTIFICATION: {
2038                         uint32_t target;
2039                         binder_uintptr_t cookie;
2040                         struct binder_ref *ref;
2041                         struct binder_ref_death *death;
2042
2043                         if (get_user(target, (uint32_t __user *)ptr))
2044                                 return -EFAULT;
2045                         ptr += sizeof(uint32_t);
2046                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2047                                 return -EFAULT;
2048                         ptr += sizeof(binder_uintptr_t);
2049                         ref = binder_get_ref(proc, target, false);
2050                         if (ref == NULL) {
2051                                 binder_user_error("%d:%d %s invalid ref %d\n",
2052                                         proc->pid, thread->pid,
2053                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2054                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2055                                         "BC_CLEAR_DEATH_NOTIFICATION",
2056                                         target);
2057                                 break;
2058                         }
2059
2060                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2061                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2062                                      proc->pid, thread->pid,
2063                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2064                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2065                                      "BC_CLEAR_DEATH_NOTIFICATION",
2066                                      (u64)cookie, ref->debug_id, ref->desc,
2067                                      ref->strong, ref->weak, ref->node->debug_id);
2068
2069                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2070                                 if (ref->death) {
2071                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2072                                                 proc->pid, thread->pid);
2073                                         break;
2074                                 }
2075                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2076                                 if (death == NULL) {
2077                                         thread->return_error = BR_ERROR;
2078                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2079                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2080                                                      proc->pid, thread->pid);
2081                                         break;
2082                                 }
2083                                 binder_stats_created(BINDER_STAT_DEATH);
2084                                 INIT_LIST_HEAD(&death->work.entry);
2085                                 death->cookie = cookie;
2086                                 ref->death = death;
2087                                 if (ref->node->proc == NULL) {
2088                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2089                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2090                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2091                                         } else {
2092                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2093                                                 wake_up_interruptible(&proc->wait);
2094                                         }
2095                                 }
2096                         } else {
2097                                 if (ref->death == NULL) {
2098                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2099                                                 proc->pid, thread->pid);
2100                                         break;
2101                                 }
2102                                 death = ref->death;
2103                                 if (death->cookie != cookie) {
2104                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2105                                                 proc->pid, thread->pid,
2106                                                 (u64)death->cookie,
2107                                                 (u64)cookie);
2108                                         break;
2109                                 }
2110                                 ref->death = NULL;
2111                                 if (list_empty(&death->work.entry)) {
2112                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2113                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2114                                                 list_add_tail(&death->work.entry, &thread->todo);
2115                                         } else {
2116                                                 list_add_tail(&death->work.entry, &proc->todo);
2117                                                 wake_up_interruptible(&proc->wait);
2118                                         }
2119                                 } else {
2120                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2121                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2122                                 }
2123                         }
2124                 } break;
2125                 case BC_DEAD_BINDER_DONE: {
2126                         struct binder_work *w;
2127                         binder_uintptr_t cookie;
2128                         struct binder_ref_death *death = NULL;
2129
2130                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2131                                 return -EFAULT;
2132
2133                         ptr += sizeof(cookie);
2134                         list_for_each_entry(w, &proc->delivered_death, entry) {
2135                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2136
2137                                 if (tmp_death->cookie == cookie) {
2138                                         death = tmp_death;
2139                                         break;
2140                                 }
2141                         }
2142                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2143                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n",
2144                                      proc->pid, thread->pid, (u64)cookie,
2145                                      death);
2146                         if (death == NULL) {
2147                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2148                                         proc->pid, thread->pid, (u64)cookie);
2149                                 break;
2150                         }
2151
2152                         list_del_init(&death->work.entry);
2153                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2154                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2155                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2156                                         list_add_tail(&death->work.entry, &thread->todo);
2157                                 } else {
2158                                         list_add_tail(&death->work.entry, &proc->todo);
2159                                         wake_up_interruptible(&proc->wait);
2160                                 }
2161                         }
2162                 } break;
2163
2164                 default:
2165                         pr_err("%d:%d unknown command %d\n",
2166                                proc->pid, thread->pid, cmd);
2167                         return -EINVAL;
2168                 }
2169                 *consumed = ptr - buffer;
2170         }
2171         return 0;
2172 }
2173
2174 static void binder_stat_br(struct binder_proc *proc,
2175                            struct binder_thread *thread, uint32_t cmd)
2176 {
2177         trace_binder_return(cmd);
2178         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2179                 binder_stats.br[_IOC_NR(cmd)]++;
2180                 proc->stats.br[_IOC_NR(cmd)]++;
2181                 thread->stats.br[_IOC_NR(cmd)]++;
2182         }
2183 }
2184
2185 static int binder_has_proc_work(struct binder_proc *proc,
2186                                 struct binder_thread *thread)
2187 {
2188         return !list_empty(&proc->todo) ||
2189                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2190 }
2191
2192 static int binder_has_thread_work(struct binder_thread *thread)
2193 {
2194         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2195                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2196 }
2197
2198 static int binder_thread_read(struct binder_proc *proc,
2199                               struct binder_thread *thread,
2200                               binder_uintptr_t binder_buffer, size_t size,
2201                               binder_size_t *consumed, int non_block)
2202 {
2203         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2204         void __user *ptr = buffer + *consumed;
2205         void __user *end = buffer + size;
2206
2207         int ret = 0;
2208         int wait_for_proc_work;
2209
2210         if (*consumed == 0) {
2211                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2212                         return -EFAULT;
2213                 ptr += sizeof(uint32_t);
2214         }
2215
2216 retry:
2217         wait_for_proc_work = thread->transaction_stack == NULL &&
2218                                 list_empty(&thread->todo);
2219
2220         if (thread->return_error != BR_OK && ptr < end) {
2221                 if (thread->return_error2 != BR_OK) {
2222                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2223                                 return -EFAULT;
2224                         ptr += sizeof(uint32_t);
2225                         binder_stat_br(proc, thread, thread->return_error2);
2226                         if (ptr == end)
2227                                 goto done;
2228                         thread->return_error2 = BR_OK;
2229                 }
2230                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2231                         return -EFAULT;
2232                 ptr += sizeof(uint32_t);
2233                 binder_stat_br(proc, thread, thread->return_error);
2234                 thread->return_error = BR_OK;
2235                 goto done;
2236         }
2237
2238
2239         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2240         if (wait_for_proc_work)
2241                 proc->ready_threads++;
2242
2243         binder_unlock(__func__);
2244
2245         trace_binder_wait_for_work(wait_for_proc_work,
2246                                    !!thread->transaction_stack,
2247                                    !list_empty(&thread->todo));
2248         if (wait_for_proc_work) {
2249                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2250                                         BINDER_LOOPER_STATE_ENTERED))) {
2251                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2252                                 proc->pid, thread->pid, thread->looper);
2253                         wait_event_interruptible(binder_user_error_wait,
2254                                                  binder_stop_on_user_error < 2);
2255                 }
2256                 binder_set_nice(proc->default_priority);
2257                 if (non_block) {
2258                         if (!binder_has_proc_work(proc, thread))
2259                                 ret = -EAGAIN;
2260                 } else
2261                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2262         } else {
2263                 if (non_block) {
2264                         if (!binder_has_thread_work(thread))
2265                                 ret = -EAGAIN;
2266                 } else
2267                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2268         }
2269
2270         binder_lock(__func__);
2271
2272         if (wait_for_proc_work)
2273                 proc->ready_threads--;
2274         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2275
2276         if (ret)
2277                 return ret;
2278
2279         while (1) {
2280                 uint32_t cmd;
2281                 struct binder_transaction_data tr;
2282                 struct binder_work *w;
2283                 struct binder_transaction *t = NULL;
2284
2285                 if (!list_empty(&thread->todo)) {
2286                         w = list_first_entry(&thread->todo, struct binder_work,
2287                                              entry);
2288                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2289                         w = list_first_entry(&proc->todo, struct binder_work,
2290                                              entry);
2291                 } else {
2292                         /* no data added */
2293                         if (ptr - buffer == 4 &&
2294                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2295                                 goto retry;
2296                         break;
2297                 }
2298
2299                 if (end - ptr < sizeof(tr) + 4)
2300                         break;
2301
2302                 switch (w->type) {
2303                 case BINDER_WORK_TRANSACTION: {
2304                         t = container_of(w, struct binder_transaction, work);
2305                 } break;
2306                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2307                         cmd = BR_TRANSACTION_COMPLETE;
2308                         if (put_user(cmd, (uint32_t __user *)ptr))
2309                                 return -EFAULT;
2310                         ptr += sizeof(uint32_t);
2311
2312                         binder_stat_br(proc, thread, cmd);
2313                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2314                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2315                                      proc->pid, thread->pid);
2316
2317                         list_del(&w->entry);
2318                         kfree(w);
2319                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2320                 } break;
2321                 case BINDER_WORK_NODE: {
2322                         struct binder_node *node = container_of(w, struct binder_node, work);
2323                         uint32_t cmd = BR_NOOP;
2324                         const char *cmd_name;
2325                         int strong = node->internal_strong_refs || node->local_strong_refs;
2326                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2327
2328                         if (weak && !node->has_weak_ref) {
2329                                 cmd = BR_INCREFS;
2330                                 cmd_name = "BR_INCREFS";
2331                                 node->has_weak_ref = 1;
2332                                 node->pending_weak_ref = 1;
2333                                 node->local_weak_refs++;
2334                         } else if (strong && !node->has_strong_ref) {
2335                                 cmd = BR_ACQUIRE;
2336                                 cmd_name = "BR_ACQUIRE";
2337                                 node->has_strong_ref = 1;
2338                                 node->pending_strong_ref = 1;
2339                                 node->local_strong_refs++;
2340                         } else if (!strong && node->has_strong_ref) {
2341                                 cmd = BR_RELEASE;
2342                                 cmd_name = "BR_RELEASE";
2343                                 node->has_strong_ref = 0;
2344                         } else if (!weak && node->has_weak_ref) {
2345                                 cmd = BR_DECREFS;
2346                                 cmd_name = "BR_DECREFS";
2347                                 node->has_weak_ref = 0;
2348                         }
2349                         if (cmd != BR_NOOP) {
2350                                 if (put_user(cmd, (uint32_t __user *)ptr))
2351                                         return -EFAULT;
2352                                 ptr += sizeof(uint32_t);
2353                                 if (put_user(node->ptr,
2354                                              (binder_uintptr_t __user *)ptr))
2355                                         return -EFAULT;
2356                                 ptr += sizeof(binder_uintptr_t);
2357                                 if (put_user(node->cookie,
2358                                              (binder_uintptr_t __user *)ptr))
2359                                         return -EFAULT;
2360                                 ptr += sizeof(binder_uintptr_t);
2361
2362                                 binder_stat_br(proc, thread, cmd);
2363                                 binder_debug(BINDER_DEBUG_USER_REFS,
2364                                              "%d:%d %s %d u%016llx c%016llx\n",
2365                                              proc->pid, thread->pid, cmd_name,
2366                                              node->debug_id,
2367                                              (u64)node->ptr, (u64)node->cookie);
2368                         } else {
2369                                 list_del_init(&w->entry);
2370                                 if (!weak && !strong) {
2371                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2372                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2373                                                      proc->pid, thread->pid,
2374                                                      node->debug_id,
2375                                                      (u64)node->ptr,
2376                                                      (u64)node->cookie);
2377                                         rb_erase(&node->rb_node, &proc->nodes);
2378                                         kfree(node);
2379                                         binder_stats_deleted(BINDER_STAT_NODE);
2380                                 } else {
2381                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2382                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2383                                                      proc->pid, thread->pid,
2384                                                      node->debug_id,
2385                                                      (u64)node->ptr,
2386                                                      (u64)node->cookie);
2387                                 }
2388                         }
2389                 } break;
2390                 case BINDER_WORK_DEAD_BINDER:
2391                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2392                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2393                         struct binder_ref_death *death;
2394                         uint32_t cmd;
2395
2396                         death = container_of(w, struct binder_ref_death, work);
2397                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2398                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2399                         else
2400                                 cmd = BR_DEAD_BINDER;
2401                         if (put_user(cmd, (uint32_t __user *)ptr))
2402                                 return -EFAULT;
2403                         ptr += sizeof(uint32_t);
2404                         if (put_user(death->cookie,
2405                                      (binder_uintptr_t __user *)ptr))
2406                                 return -EFAULT;
2407                         ptr += sizeof(binder_uintptr_t);
2408                         binder_stat_br(proc, thread, cmd);
2409                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2410                                      "%d:%d %s %016llx\n",
2411                                       proc->pid, thread->pid,
2412                                       cmd == BR_DEAD_BINDER ?
2413                                       "BR_DEAD_BINDER" :
2414                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2415                                       (u64)death->cookie);
2416
2417                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2418                                 list_del(&w->entry);
2419                                 kfree(death);
2420                                 binder_stats_deleted(BINDER_STAT_DEATH);
2421                         } else
2422                                 list_move(&w->entry, &proc->delivered_death);
2423                         if (cmd == BR_DEAD_BINDER)
2424                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2425                 } break;
2426                 }
2427
2428                 if (!t)
2429                         continue;
2430
2431                 BUG_ON(t->buffer == NULL);
2432                 if (t->buffer->target_node) {
2433                         struct binder_node *target_node = t->buffer->target_node;
2434
2435                         tr.target.ptr = target_node->ptr;
2436                         tr.cookie =  target_node->cookie;
2437                         t->saved_priority = task_nice(current);
2438                         if (t->priority < target_node->min_priority &&
2439                             !(t->flags & TF_ONE_WAY))
2440                                 binder_set_nice(t->priority);
2441                         else if (!(t->flags & TF_ONE_WAY) ||
2442                                  t->saved_priority > target_node->min_priority)
2443                                 binder_set_nice(target_node->min_priority);
2444                         cmd = BR_TRANSACTION;
2445                 } else {
2446                         tr.target.ptr = 0;
2447                         tr.cookie = 0;
2448                         cmd = BR_REPLY;
2449                 }
2450                 tr.code = t->code;
2451                 tr.flags = t->flags;
2452                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2453
2454                 if (t->from) {
2455                         struct task_struct *sender = t->from->proc->tsk;
2456
2457                         tr.sender_pid = task_tgid_nr_ns(sender,
2458                                                         task_active_pid_ns(current));
2459                 } else {
2460                         tr.sender_pid = 0;
2461                 }
2462
2463                 tr.data_size = t->buffer->data_size;
2464                 tr.offsets_size = t->buffer->offsets_size;
2465                 tr.data.ptr.buffer = (binder_uintptr_t)(
2466                                         (uintptr_t)t->buffer->data +
2467                                         proc->user_buffer_offset);
2468                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2469                                         ALIGN(t->buffer->data_size,
2470                                             sizeof(void *));
2471
2472                 if (put_user(cmd, (uint32_t __user *)ptr))
2473                         return -EFAULT;
2474                 ptr += sizeof(uint32_t);
2475                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2476                         return -EFAULT;
2477                 ptr += sizeof(tr);
2478
2479                 trace_binder_transaction_received(t);
2480                 binder_stat_br(proc, thread, cmd);
2481                 binder_debug(BINDER_DEBUG_TRANSACTION,
2482                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2483                              proc->pid, thread->pid,
2484                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2485                              "BR_REPLY",
2486                              t->debug_id, t->from ? t->from->proc->pid : 0,
2487                              t->from ? t->from->pid : 0, cmd,
2488                              t->buffer->data_size, t->buffer->offsets_size,
2489                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2490
2491                 list_del(&t->work.entry);
2492                 t->buffer->allow_user_free = 1;
2493                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2494                         t->to_parent = thread->transaction_stack;
2495                         t->to_thread = thread;
2496                         thread->transaction_stack = t;
2497                 } else {
2498                         t->buffer->transaction = NULL;
2499                         kfree(t);
2500                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2501                 }
2502                 break;
2503         }
2504
2505 done:
2506
2507         *consumed = ptr - buffer;
2508         if (proc->requested_threads + proc->ready_threads == 0 &&
2509             proc->requested_threads_started < proc->max_threads &&
2510             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2511              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2512              /*spawn a new thread if we leave this out */) {
2513                 proc->requested_threads++;
2514                 binder_debug(BINDER_DEBUG_THREADS,
2515                              "%d:%d BR_SPAWN_LOOPER\n",
2516                              proc->pid, thread->pid);
2517                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2518                         return -EFAULT;
2519                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2520         }
2521         return 0;
2522 }
2523
2524 static void binder_release_work(struct list_head *list)
2525 {
2526         struct binder_work *w;
2527
2528         while (!list_empty(list)) {
2529                 w = list_first_entry(list, struct binder_work, entry);
2530                 list_del_init(&w->entry);
2531                 switch (w->type) {
2532                 case BINDER_WORK_TRANSACTION: {
2533                         struct binder_transaction *t;
2534
2535                         t = container_of(w, struct binder_transaction, work);
2536                         if (t->buffer->target_node &&
2537                             !(t->flags & TF_ONE_WAY)) {
2538                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2539                         } else {
2540                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2541                                         "undelivered transaction %d\n",
2542                                         t->debug_id);
2543                                 t->buffer->transaction = NULL;
2544                                 kfree(t);
2545                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2546                         }
2547                 } break;
2548                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2549                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2550                                 "undelivered TRANSACTION_COMPLETE\n");
2551                         kfree(w);
2552                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2553                 } break;
2554                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2555                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2556                         struct binder_ref_death *death;
2557
2558                         death = container_of(w, struct binder_ref_death, work);
2559                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2560                                 "undelivered death notification, %016llx\n",
2561                                 (u64)death->cookie);
2562                         kfree(death);
2563                         binder_stats_deleted(BINDER_STAT_DEATH);
2564                 } break;
2565                 default:
2566                         pr_err("unexpected work type, %d, not freed\n",
2567                                w->type);
2568                         break;
2569                 }
2570         }
2571
2572 }
2573
2574 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2575 {
2576         struct binder_thread *thread = NULL;
2577         struct rb_node *parent = NULL;
2578         struct rb_node **p = &proc->threads.rb_node;
2579
2580         while (*p) {
2581                 parent = *p;
2582                 thread = rb_entry(parent, struct binder_thread, rb_node);
2583
2584                 if (current->pid < thread->pid)
2585                         p = &(*p)->rb_left;
2586                 else if (current->pid > thread->pid)
2587                         p = &(*p)->rb_right;
2588                 else
2589                         break;
2590         }
2591         if (*p == NULL) {
2592                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2593                 if (thread == NULL)
2594                         return NULL;
2595                 binder_stats_created(BINDER_STAT_THREAD);
2596                 thread->proc = proc;
2597                 thread->pid = current->pid;
2598                 init_waitqueue_head(&thread->wait);
2599                 INIT_LIST_HEAD(&thread->todo);
2600                 rb_link_node(&thread->rb_node, parent, p);
2601                 rb_insert_color(&thread->rb_node, &proc->threads);
2602                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2603                 thread->return_error = BR_OK;
2604                 thread->return_error2 = BR_OK;
2605         }
2606         return thread;
2607 }
2608
2609 static int binder_free_thread(struct binder_proc *proc,
2610                               struct binder_thread *thread)
2611 {
2612         struct binder_transaction *t;
2613         struct binder_transaction *send_reply = NULL;
2614         int active_transactions = 0;
2615
2616         rb_erase(&thread->rb_node, &proc->threads);
2617         t = thread->transaction_stack;
2618         if (t && t->to_thread == thread)
2619                 send_reply = t;
2620         while (t) {
2621                 active_transactions++;
2622                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2623                              "release %d:%d transaction %d %s, still active\n",
2624                               proc->pid, thread->pid,
2625                              t->debug_id,
2626                              (t->to_thread == thread) ? "in" : "out");
2627
2628                 if (t->to_thread == thread) {
2629                         t->to_proc = NULL;
2630                         t->to_thread = NULL;
2631                         if (t->buffer) {
2632                                 t->buffer->transaction = NULL;
2633                                 t->buffer = NULL;
2634                         }
2635                         t = t->to_parent;
2636                 } else if (t->from == thread) {
2637                         t->from = NULL;
2638                         t = t->from_parent;
2639                 } else
2640                         BUG();
2641         }
2642
2643         /*
2644          * If this thread used poll, make sure we remove the waitqueue from any
2645          * poll data structures holding it.
2646          */
2647         if (thread->looper & BINDER_LOOPER_STATE_POLL)
2648                 wake_up_pollfree(&thread->wait);
2649
2650         /*
2651          * This is needed to avoid races between wake_up_pollfree() above and
2652          * someone else removing the last entry from the queue for other reasons
2653          * (e.g. ep_remove_wait_queue() being called due to an epoll file
2654          * descriptor being closed).  Such other users hold an RCU read lock, so
2655          * we can be sure they're done after we call synchronize_rcu().
2656          */
2657         if (thread->looper & BINDER_LOOPER_STATE_POLL)
2658                 synchronize_rcu();
2659
2660         if (send_reply)
2661                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2662         binder_release_work(&thread->todo);
2663         kfree(thread);
2664         binder_stats_deleted(BINDER_STAT_THREAD);
2665         return active_transactions;
2666 }
2667
2668 static unsigned int binder_poll(struct file *filp,
2669                                 struct poll_table_struct *wait)
2670 {
2671         struct binder_proc *proc = filp->private_data;
2672         struct binder_thread *thread = NULL;
2673         int wait_for_proc_work;
2674
2675         binder_lock(__func__);
2676
2677         thread = binder_get_thread(proc);
2678         if (!thread) {
2679                 binder_unlock(__func__);
2680                 return POLLERR;
2681         }
2682
2683         thread->looper |= BINDER_LOOPER_STATE_POLL;
2684
2685         wait_for_proc_work = thread->transaction_stack == NULL &&
2686                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2687
2688         binder_unlock(__func__);
2689
2690         if (wait_for_proc_work) {
2691                 if (binder_has_proc_work(proc, thread))
2692                         return POLLIN;
2693                 poll_wait(filp, &proc->wait, wait);
2694                 if (binder_has_proc_work(proc, thread))
2695                         return POLLIN;
2696         } else {
2697                 if (binder_has_thread_work(thread))
2698                         return POLLIN;
2699                 poll_wait(filp, &thread->wait, wait);
2700                 if (binder_has_thread_work(thread))
2701                         return POLLIN;
2702         }
2703         return 0;
2704 }
2705
2706 static int binder_ioctl_write_read(struct file *filp,
2707                                 unsigned int cmd, unsigned long arg,
2708                                 struct binder_thread *thread)
2709 {
2710         int ret = 0;
2711         struct binder_proc *proc = filp->private_data;
2712         unsigned int size = _IOC_SIZE(cmd);
2713         void __user *ubuf = (void __user *)arg;
2714         struct binder_write_read bwr;
2715
2716         if (size != sizeof(struct binder_write_read)) {
2717                 ret = -EINVAL;
2718                 goto out;
2719         }
2720         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2721                 ret = -EFAULT;
2722                 goto out;
2723         }
2724         binder_debug(BINDER_DEBUG_READ_WRITE,
2725                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2726                      proc->pid, thread->pid,
2727                      (u64)bwr.write_size, (u64)bwr.write_buffer,
2728                      (u64)bwr.read_size, (u64)bwr.read_buffer);
2729
2730         if (bwr.write_size > 0) {
2731                 ret = binder_thread_write(proc, thread,
2732                                           bwr.write_buffer,
2733                                           bwr.write_size,
2734                                           &bwr.write_consumed);
2735                 trace_binder_write_done(ret);
2736                 if (ret < 0) {
2737                         bwr.read_consumed = 0;
2738                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2739                                 ret = -EFAULT;
2740                         goto out;
2741                 }
2742         }
2743         if (bwr.read_size > 0) {
2744                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2745                                          bwr.read_size,
2746                                          &bwr.read_consumed,
2747                                          filp->f_flags & O_NONBLOCK);
2748                 trace_binder_read_done(ret);
2749                 if (!list_empty(&proc->todo))
2750                         wake_up_interruptible(&proc->wait);
2751                 if (ret < 0) {
2752                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2753                                 ret = -EFAULT;
2754                         goto out;
2755                 }
2756         }
2757         binder_debug(BINDER_DEBUG_READ_WRITE,
2758                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2759                      proc->pid, thread->pid,
2760                      (u64)bwr.write_consumed, (u64)bwr.write_size,
2761                      (u64)bwr.read_consumed, (u64)bwr.read_size);
2762         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2763                 ret = -EFAULT;
2764                 goto out;
2765         }
2766 out:
2767         return ret;
2768 }
2769
2770 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2771 {
2772         int ret = 0;
2773         struct binder_proc *proc = filp->private_data;
2774         kuid_t curr_euid = current_euid();
2775
2776         if (binder_context_mgr_node != NULL) {
2777                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2778                 ret = -EBUSY;
2779                 goto out;
2780         }
2781         ret = security_binder_set_context_mgr(proc->cred);
2782         if (ret < 0)
2783                 goto out;
2784         if (uid_valid(binder_context_mgr_uid)) {
2785                 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2786                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2787                                from_kuid(&init_user_ns, curr_euid),
2788                                from_kuid(&init_user_ns,
2789                                         binder_context_mgr_uid));
2790                         ret = -EPERM;
2791                         goto out;
2792                 }
2793         } else {
2794                 binder_context_mgr_uid = curr_euid;
2795         }
2796         binder_context_mgr_node = binder_new_node(proc, 0, 0);
2797         if (binder_context_mgr_node == NULL) {
2798                 ret = -ENOMEM;
2799                 goto out;
2800         }
2801         binder_context_mgr_node->local_weak_refs++;
2802         binder_context_mgr_node->local_strong_refs++;
2803         binder_context_mgr_node->has_strong_ref = 1;
2804         binder_context_mgr_node->has_weak_ref = 1;
2805 out:
2806         return ret;
2807 }
2808
2809 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2810 {
2811         int ret;
2812         struct binder_proc *proc = filp->private_data;
2813         struct binder_thread *thread;
2814         unsigned int size = _IOC_SIZE(cmd);
2815         void __user *ubuf = (void __user *)arg;
2816
2817         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2818                         proc->pid, current->pid, cmd, arg);*/
2819
2820         trace_binder_ioctl(cmd, arg);
2821
2822         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2823         if (ret)
2824                 goto err_unlocked;
2825
2826         binder_lock(__func__);
2827         thread = binder_get_thread(proc);
2828         if (thread == NULL) {
2829                 ret = -ENOMEM;
2830                 goto err;
2831         }
2832
2833         switch (cmd) {
2834         case BINDER_WRITE_READ:
2835                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2836                 if (ret)
2837                         goto err;
2838                 break;
2839         case BINDER_SET_MAX_THREADS:
2840                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2841                         ret = -EINVAL;
2842                         goto err;
2843                 }
2844                 break;
2845         case BINDER_SET_CONTEXT_MGR:
2846                 ret = binder_ioctl_set_ctx_mgr(filp);
2847                 if (ret)
2848                         goto err;
2849                 break;
2850         case BINDER_THREAD_EXIT:
2851                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2852                              proc->pid, thread->pid);
2853                 binder_free_thread(proc, thread);
2854                 thread = NULL;
2855                 break;
2856         case BINDER_VERSION: {
2857                 struct binder_version __user *ver = ubuf;
2858
2859                 if (size != sizeof(struct binder_version)) {
2860                         ret = -EINVAL;
2861                         goto err;
2862                 }
2863                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2864                              &ver->protocol_version)) {
2865                         ret = -EINVAL;
2866                         goto err;
2867                 }
2868                 break;
2869         }
2870         default:
2871                 ret = -EINVAL;
2872                 goto err;
2873         }
2874         ret = 0;
2875 err:
2876         if (thread)
2877                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2878         binder_unlock(__func__);
2879         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2880         if (ret && ret != -ERESTARTSYS)
2881                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2882 err_unlocked:
2883         trace_binder_ioctl_done(ret);
2884         return ret;
2885 }
2886
2887 static void binder_vma_open(struct vm_area_struct *vma)
2888 {
2889         struct binder_proc *proc = vma->vm_private_data;
2890
2891         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2892                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2893                      proc->pid, vma->vm_start, vma->vm_end,
2894                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2895                      (unsigned long)pgprot_val(vma->vm_page_prot));
2896 }
2897
2898 static void binder_vma_close(struct vm_area_struct *vma)
2899 {
2900         struct binder_proc *proc = vma->vm_private_data;
2901
2902         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2903                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2904                      proc->pid, vma->vm_start, vma->vm_end,
2905                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2906                      (unsigned long)pgprot_val(vma->vm_page_prot));
2907         proc->vma = NULL;
2908         proc->vma_vm_mm = NULL;
2909         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2910 }
2911
2912 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2913 {
2914         return VM_FAULT_SIGBUS;
2915 }
2916
2917 static const struct vm_operations_struct binder_vm_ops = {
2918         .open = binder_vma_open,
2919         .close = binder_vma_close,
2920         .fault = binder_vm_fault,
2921 };
2922
2923 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2924 {
2925         int ret;
2926         struct vm_struct *area;
2927         struct binder_proc *proc = filp->private_data;
2928         const char *failure_string;
2929         struct binder_buffer *buffer;
2930
2931         if (proc->tsk != current->group_leader)
2932                 return -EINVAL;
2933
2934         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2935                 vma->vm_end = vma->vm_start + SZ_4M;
2936
2937         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2938                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2939                      proc->pid, vma->vm_start, vma->vm_end,
2940                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2941                      (unsigned long)pgprot_val(vma->vm_page_prot));
2942
2943         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2944                 ret = -EPERM;
2945                 failure_string = "bad vm_flags";
2946                 goto err_bad_arg;
2947         }
2948         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2949
2950         mutex_lock(&binder_mmap_lock);
2951         if (proc->buffer) {
2952                 ret = -EBUSY;
2953                 failure_string = "already mapped";
2954                 goto err_already_mapped;
2955         }
2956
2957         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2958         if (area == NULL) {
2959                 ret = -ENOMEM;
2960                 failure_string = "get_vm_area";
2961                 goto err_get_vm_area_failed;
2962         }
2963         proc->buffer = area->addr;
2964         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2965         mutex_unlock(&binder_mmap_lock);
2966
2967 #ifdef CONFIG_CPU_CACHE_VIPT
2968         if (cache_is_vipt_aliasing()) {
2969                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2970                         pr_info("binder_mmap: %d %lx-%lx maps %pK bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2971                         vma->vm_start += PAGE_SIZE;
2972                 }
2973         }
2974 #endif
2975         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2976         if (proc->pages == NULL) {
2977                 ret = -ENOMEM;
2978                 failure_string = "alloc page array";
2979                 goto err_alloc_pages_failed;
2980         }
2981         proc->buffer_size = vma->vm_end - vma->vm_start;
2982
2983         vma->vm_ops = &binder_vm_ops;
2984         vma->vm_private_data = proc;
2985
2986         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2987                 ret = -ENOMEM;
2988                 failure_string = "alloc small buf";
2989                 goto err_alloc_small_buf_failed;
2990         }
2991         buffer = proc->buffer;
2992         INIT_LIST_HEAD(&proc->buffers);
2993         list_add(&buffer->entry, &proc->buffers);
2994         buffer->free = 1;
2995         binder_insert_free_buffer(proc, buffer);
2996         proc->free_async_space = proc->buffer_size / 2;
2997         barrier();
2998         mutex_lock(&proc->files_lock);
2999         proc->files = get_files_struct(current);
3000         mutex_unlock(&proc->files_lock);
3001         proc->vma = vma;
3002         proc->vma_vm_mm = vma->vm_mm;
3003
3004         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
3005                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
3006         return 0;
3007
3008 err_alloc_small_buf_failed:
3009         kfree(proc->pages);
3010         proc->pages = NULL;
3011 err_alloc_pages_failed:
3012         mutex_lock(&binder_mmap_lock);
3013         vfree(proc->buffer);
3014         proc->buffer = NULL;
3015 err_get_vm_area_failed:
3016 err_already_mapped:
3017         mutex_unlock(&binder_mmap_lock);
3018 err_bad_arg:
3019         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
3020                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
3021         return ret;
3022 }
3023
3024 static int binder_open(struct inode *nodp, struct file *filp)
3025 {
3026         struct binder_proc *proc;
3027
3028         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
3029                      current->group_leader->pid, current->pid);
3030
3031         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
3032         if (proc == NULL)
3033                 return -ENOMEM;
3034         get_task_struct(current->group_leader);
3035         proc->tsk = current->group_leader;
3036         mutex_init(&proc->files_lock);
3037         proc->cred = get_cred(filp->f_cred);
3038         INIT_LIST_HEAD(&proc->todo);
3039         init_waitqueue_head(&proc->wait);
3040         proc->default_priority = task_nice(current);
3041
3042         binder_lock(__func__);
3043
3044         binder_stats_created(BINDER_STAT_PROC);
3045         hlist_add_head(&proc->proc_node, &binder_procs);
3046         proc->pid = current->group_leader->pid;
3047         INIT_LIST_HEAD(&proc->delivered_death);
3048         filp->private_data = proc;
3049
3050         binder_unlock(__func__);
3051
3052         if (binder_debugfs_dir_entry_proc) {
3053                 char strbuf[11];
3054
3055                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3056                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3057                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
3058         }
3059
3060         return 0;
3061 }
3062
3063 static int binder_flush(struct file *filp, fl_owner_t id)
3064 {
3065         struct binder_proc *proc = filp->private_data;
3066
3067         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3068
3069         return 0;
3070 }
3071
3072 static void binder_deferred_flush(struct binder_proc *proc)
3073 {
3074         struct rb_node *n;
3075         int wake_count = 0;
3076
3077         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3078                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3079
3080                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3081                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3082                         wake_up_interruptible(&thread->wait);
3083                         wake_count++;
3084                 }
3085         }
3086         wake_up_interruptible_all(&proc->wait);
3087
3088         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3089                      "binder_flush: %d woke %d threads\n", proc->pid,
3090                      wake_count);
3091 }
3092
3093 static int binder_release(struct inode *nodp, struct file *filp)
3094 {
3095         struct binder_proc *proc = filp->private_data;
3096
3097         debugfs_remove(proc->debugfs_entry);
3098         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3099
3100         return 0;
3101 }
3102
3103 static int binder_node_release(struct binder_node *node, int refs)
3104 {
3105         struct binder_ref *ref;
3106         int death = 0;
3107
3108         list_del_init(&node->work.entry);
3109         binder_release_work(&node->async_todo);
3110
3111         if (hlist_empty(&node->refs)) {
3112                 kfree(node);
3113                 binder_stats_deleted(BINDER_STAT_NODE);
3114
3115                 return refs;
3116         }
3117
3118         node->proc = NULL;
3119         node->local_strong_refs = 0;
3120         node->local_weak_refs = 0;
3121         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3122
3123         hlist_for_each_entry(ref, &node->refs, node_entry) {
3124                 refs++;
3125
3126                 if (!ref->death)
3127                         continue;
3128
3129                 death++;
3130
3131                 if (list_empty(&ref->death->work.entry)) {
3132                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3133                         list_add_tail(&ref->death->work.entry,
3134                                       &ref->proc->todo);
3135                         wake_up_interruptible(&ref->proc->wait);
3136                 } else
3137                         BUG();
3138         }
3139
3140         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3141                      "node %d now dead, refs %d, death %d\n",
3142                      node->debug_id, refs, death);
3143
3144         return refs;
3145 }
3146
3147 static void binder_deferred_release(struct binder_proc *proc)
3148 {
3149         struct binder_transaction *t;
3150         struct rb_node *n;
3151         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3152                 active_transactions, page_count;
3153
3154         BUG_ON(proc->vma);
3155         BUG_ON(proc->files);
3156
3157         hlist_del(&proc->proc_node);
3158
3159         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3160                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3161                              "%s: %d context_mgr_node gone\n",
3162                              __func__, proc->pid);
3163                 binder_context_mgr_node = NULL;
3164         }
3165
3166         threads = 0;
3167         active_transactions = 0;
3168         while ((n = rb_first(&proc->threads))) {
3169                 struct binder_thread *thread;
3170
3171                 thread = rb_entry(n, struct binder_thread, rb_node);
3172                 threads++;
3173                 active_transactions += binder_free_thread(proc, thread);
3174         }
3175
3176         nodes = 0;
3177         incoming_refs = 0;
3178         while ((n = rb_first(&proc->nodes))) {
3179                 struct binder_node *node;
3180
3181                 node = rb_entry(n, struct binder_node, rb_node);
3182                 nodes++;
3183                 rb_erase(&node->rb_node, &proc->nodes);
3184                 incoming_refs = binder_node_release(node, incoming_refs);
3185         }
3186
3187         outgoing_refs = 0;
3188         while ((n = rb_first(&proc->refs_by_desc))) {
3189                 struct binder_ref *ref;
3190
3191                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3192                 outgoing_refs++;
3193                 binder_delete_ref(ref);
3194         }
3195
3196         binder_release_work(&proc->todo);
3197         binder_release_work(&proc->delivered_death);
3198
3199         buffers = 0;
3200         while ((n = rb_first(&proc->allocated_buffers))) {
3201                 struct binder_buffer *buffer;
3202
3203                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3204
3205                 t = buffer->transaction;
3206                 if (t) {
3207                         t->buffer = NULL;
3208                         buffer->transaction = NULL;
3209                         pr_err("release proc %d, transaction %d, not freed\n",
3210                                proc->pid, t->debug_id);
3211                         /*BUG();*/
3212                 }
3213
3214                 binder_free_buf(proc, buffer);
3215                 buffers++;
3216         }
3217
3218         binder_stats_deleted(BINDER_STAT_PROC);
3219
3220         page_count = 0;
3221         if (proc->pages) {
3222                 int i;
3223
3224                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3225                         void *page_addr;
3226
3227                         if (!proc->pages[i])
3228                                 continue;
3229
3230                         page_addr = proc->buffer + i * PAGE_SIZE;
3231                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3232                                      "%s: %d: page %d at %pK not freed\n",
3233                                      __func__, proc->pid, i, page_addr);
3234                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3235                         __free_page(proc->pages[i]);
3236                         page_count++;
3237                 }
3238                 kfree(proc->pages);
3239                 vfree(proc->buffer);
3240         }
3241
3242         put_task_struct(proc->tsk);
3243         put_cred(proc->cred);
3244
3245         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3246                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3247                      __func__, proc->pid, threads, nodes, incoming_refs,
3248                      outgoing_refs, active_transactions, buffers, page_count);
3249
3250         kfree(proc);
3251 }
3252
3253 static void binder_deferred_func(struct work_struct *work)
3254 {
3255         struct binder_proc *proc;
3256         struct files_struct *files;
3257
3258         int defer;
3259
3260         do {
3261                 binder_lock(__func__);
3262                 mutex_lock(&binder_deferred_lock);
3263                 if (!hlist_empty(&binder_deferred_list)) {
3264                         proc = hlist_entry(binder_deferred_list.first,
3265                                         struct binder_proc, deferred_work_node);
3266                         hlist_del_init(&proc->deferred_work_node);
3267                         defer = proc->deferred_work;
3268                         proc->deferred_work = 0;
3269                 } else {
3270                         proc = NULL;
3271                         defer = 0;
3272                 }
3273                 mutex_unlock(&binder_deferred_lock);
3274
3275                 files = NULL;
3276                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3277                         mutex_lock(&proc->files_lock);
3278                         files = proc->files;
3279                         if (files)
3280                                 proc->files = NULL;
3281                         mutex_unlock(&proc->files_lock);
3282                 }
3283
3284                 if (defer & BINDER_DEFERRED_FLUSH)
3285                         binder_deferred_flush(proc);
3286
3287                 if (defer & BINDER_DEFERRED_RELEASE)
3288                         binder_deferred_release(proc); /* frees proc */
3289
3290                 binder_unlock(__func__);
3291                 if (files)
3292                         put_files_struct(files);
3293         } while (proc);
3294 }
3295 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3296
3297 static void
3298 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3299 {
3300         mutex_lock(&binder_deferred_lock);
3301         proc->deferred_work |= defer;
3302         if (hlist_unhashed(&proc->deferred_work_node)) {
3303                 hlist_add_head(&proc->deferred_work_node,
3304                                 &binder_deferred_list);
3305                 schedule_work(&binder_deferred_work);
3306         }
3307         mutex_unlock(&binder_deferred_lock);
3308 }
3309
3310 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3311                                      struct binder_transaction *t)
3312 {
3313         seq_printf(m,
3314                    "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3315                    prefix, t->debug_id, t,
3316                    t->from ? t->from->proc->pid : 0,
3317                    t->from ? t->from->pid : 0,
3318                    t->to_proc ? t->to_proc->pid : 0,
3319                    t->to_thread ? t->to_thread->pid : 0,
3320                    t->code, t->flags, t->priority, t->need_reply);
3321         if (t->buffer == NULL) {
3322                 seq_puts(m, " buffer free\n");
3323                 return;
3324         }
3325         if (t->buffer->target_node)
3326                 seq_printf(m, " node %d",
3327                            t->buffer->target_node->debug_id);
3328         seq_printf(m, " size %zd:%zd data %pK\n",
3329                    t->buffer->data_size, t->buffer->offsets_size,
3330                    t->buffer->data);
3331 }
3332
3333 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3334                                 struct binder_buffer *buffer)
3335 {
3336         seq_printf(m, "%s %d: %pK size %zd:%zd %s\n",
3337                    prefix, buffer->debug_id, buffer->data,
3338                    buffer->data_size, buffer->offsets_size,
3339                    buffer->transaction ? "active" : "delivered");
3340 }
3341
3342 static void print_binder_work(struct seq_file *m, const char *prefix,
3343                               const char *transaction_prefix,
3344                               struct binder_work *w)
3345 {
3346         struct binder_node *node;
3347         struct binder_transaction *t;
3348
3349         switch (w->type) {
3350         case BINDER_WORK_TRANSACTION:
3351                 t = container_of(w, struct binder_transaction, work);
3352                 print_binder_transaction(m, transaction_prefix, t);
3353                 break;
3354         case BINDER_WORK_TRANSACTION_COMPLETE:
3355                 seq_printf(m, "%stransaction complete\n", prefix);
3356                 break;
3357         case BINDER_WORK_NODE:
3358                 node = container_of(w, struct binder_node, work);
3359                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3360                            prefix, node->debug_id,
3361                            (u64)node->ptr, (u64)node->cookie);
3362                 break;
3363         case BINDER_WORK_DEAD_BINDER:
3364                 seq_printf(m, "%shas dead binder\n", prefix);
3365                 break;
3366         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3367                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3368                 break;
3369         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3370                 seq_printf(m, "%shas cleared death notification\n", prefix);
3371                 break;
3372         default:
3373                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3374                 break;
3375         }
3376 }
3377
3378 static void print_binder_thread(struct seq_file *m,
3379                                 struct binder_thread *thread,
3380                                 int print_always)
3381 {
3382         struct binder_transaction *t;
3383         struct binder_work *w;
3384         size_t start_pos = m->count;
3385         size_t header_pos;
3386
3387         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3388         header_pos = m->count;
3389         t = thread->transaction_stack;
3390         while (t) {
3391                 if (t->from == thread) {
3392                         print_binder_transaction(m,
3393                                                  "    outgoing transaction", t);
3394                         t = t->from_parent;
3395                 } else if (t->to_thread == thread) {
3396                         print_binder_transaction(m,
3397                                                  "    incoming transaction", t);
3398                         t = t->to_parent;
3399                 } else {
3400                         print_binder_transaction(m, "    bad transaction", t);
3401                         t = NULL;
3402                 }
3403         }
3404         list_for_each_entry(w, &thread->todo, entry) {
3405                 print_binder_work(m, "    ", "    pending transaction", w);
3406         }
3407         if (!print_always && m->count == header_pos)
3408                 m->count = start_pos;
3409 }
3410
3411 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3412 {
3413         struct binder_ref *ref;
3414         struct binder_work *w;
3415         int count;
3416
3417         count = 0;
3418         hlist_for_each_entry(ref, &node->refs, node_entry)
3419                 count++;
3420
3421         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3422                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3423                    node->has_strong_ref, node->has_weak_ref,
3424                    node->local_strong_refs, node->local_weak_refs,
3425                    node->internal_strong_refs, count);
3426         if (count) {
3427                 seq_puts(m, " proc");
3428                 hlist_for_each_entry(ref, &node->refs, node_entry)
3429                         seq_printf(m, " %d", ref->proc->pid);
3430         }
3431         seq_puts(m, "\n");
3432         list_for_each_entry(w, &node->async_todo, entry)
3433                 print_binder_work(m, "    ",
3434                                   "    pending async transaction", w);
3435 }
3436
3437 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3438 {
3439         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %pK\n",
3440                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3441                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3442 }
3443
3444 static void print_binder_proc(struct seq_file *m,
3445                               struct binder_proc *proc, int print_all)
3446 {
3447         struct binder_work *w;
3448         struct rb_node *n;
3449         size_t start_pos = m->count;
3450         size_t header_pos;
3451
3452         seq_printf(m, "proc %d\n", proc->pid);
3453         header_pos = m->count;
3454
3455         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3456                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3457                                                 rb_node), print_all);
3458         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3459                 struct binder_node *node = rb_entry(n, struct binder_node,
3460                                                     rb_node);
3461                 if (print_all || node->has_async_transaction)
3462                         print_binder_node(m, node);
3463         }
3464         if (print_all) {
3465                 for (n = rb_first(&proc->refs_by_desc);
3466                      n != NULL;
3467                      n = rb_next(n))
3468                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3469                                                      rb_node_desc));
3470         }
3471         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3472                 print_binder_buffer(m, "  buffer",
3473                                     rb_entry(n, struct binder_buffer, rb_node));
3474         list_for_each_entry(w, &proc->todo, entry)
3475                 print_binder_work(m, "  ", "  pending transaction", w);
3476         list_for_each_entry(w, &proc->delivered_death, entry) {
3477                 seq_puts(m, "  has delivered dead binder\n");
3478                 break;
3479         }
3480         if (!print_all && m->count == header_pos)
3481                 m->count = start_pos;
3482 }
3483
3484 static const char * const binder_return_strings[] = {
3485         "BR_ERROR",
3486         "BR_OK",
3487         "BR_TRANSACTION",
3488         "BR_REPLY",
3489         "BR_ACQUIRE_RESULT",
3490         "BR_DEAD_REPLY",
3491         "BR_TRANSACTION_COMPLETE",
3492         "BR_INCREFS",
3493         "BR_ACQUIRE",
3494         "BR_RELEASE",
3495         "BR_DECREFS",
3496         "BR_ATTEMPT_ACQUIRE",
3497         "BR_NOOP",
3498         "BR_SPAWN_LOOPER",
3499         "BR_FINISHED",
3500         "BR_DEAD_BINDER",
3501         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3502         "BR_FAILED_REPLY"
3503 };
3504
3505 static const char * const binder_command_strings[] = {
3506         "BC_TRANSACTION",
3507         "BC_REPLY",
3508         "BC_ACQUIRE_RESULT",
3509         "BC_FREE_BUFFER",
3510         "BC_INCREFS",
3511         "BC_ACQUIRE",
3512         "BC_RELEASE",
3513         "BC_DECREFS",
3514         "BC_INCREFS_DONE",
3515         "BC_ACQUIRE_DONE",
3516         "BC_ATTEMPT_ACQUIRE",
3517         "BC_REGISTER_LOOPER",
3518         "BC_ENTER_LOOPER",
3519         "BC_EXIT_LOOPER",
3520         "BC_REQUEST_DEATH_NOTIFICATION",
3521         "BC_CLEAR_DEATH_NOTIFICATION",
3522         "BC_DEAD_BINDER_DONE"
3523 };
3524
3525 static const char * const binder_objstat_strings[] = {
3526         "proc",
3527         "thread",
3528         "node",
3529         "ref",
3530         "death",
3531         "transaction",
3532         "transaction_complete"
3533 };
3534
3535 static void print_binder_stats(struct seq_file *m, const char *prefix,
3536                                struct binder_stats *stats)
3537 {
3538         int i;
3539
3540         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3541                      ARRAY_SIZE(binder_command_strings));
3542         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3543                 if (stats->bc[i])
3544                         seq_printf(m, "%s%s: %d\n", prefix,
3545                                    binder_command_strings[i], stats->bc[i]);
3546         }
3547
3548         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3549                      ARRAY_SIZE(binder_return_strings));
3550         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3551                 if (stats->br[i])
3552                         seq_printf(m, "%s%s: %d\n", prefix,
3553                                    binder_return_strings[i], stats->br[i]);
3554         }
3555
3556         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3557                      ARRAY_SIZE(binder_objstat_strings));
3558         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3559                      ARRAY_SIZE(stats->obj_deleted));
3560         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3561                 if (stats->obj_created[i] || stats->obj_deleted[i])
3562                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3563                                 binder_objstat_strings[i],
3564                                 stats->obj_created[i] - stats->obj_deleted[i],
3565                                 stats->obj_created[i]);
3566         }
3567 }
3568
3569 static void print_binder_proc_stats(struct seq_file *m,
3570                                     struct binder_proc *proc)
3571 {
3572         struct binder_work *w;
3573         struct rb_node *n;
3574         int count, strong, weak;
3575
3576         seq_printf(m, "proc %d\n", proc->pid);
3577         count = 0;
3578         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3579                 count++;
3580         seq_printf(m, "  threads: %d\n", count);
3581         seq_printf(m, "  requested threads: %d+%d/%d\n"
3582                         "  ready threads %d\n"
3583                         "  free async space %zd\n", proc->requested_threads,
3584                         proc->requested_threads_started, proc->max_threads,
3585                         proc->ready_threads, proc->free_async_space);
3586         count = 0;
3587         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3588                 count++;
3589         seq_printf(m, "  nodes: %d\n", count);
3590         count = 0;
3591         strong = 0;
3592         weak = 0;
3593         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3594                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3595                                                   rb_node_desc);
3596                 count++;
3597                 strong += ref->strong;
3598                 weak += ref->weak;
3599         }
3600         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3601
3602         count = 0;
3603         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3604                 count++;
3605         seq_printf(m, "  buffers: %d\n", count);
3606
3607         count = 0;
3608         list_for_each_entry(w, &proc->todo, entry) {
3609                 switch (w->type) {
3610                 case BINDER_WORK_TRANSACTION:
3611                         count++;
3612                         break;
3613                 default:
3614                         break;
3615                 }
3616         }
3617         seq_printf(m, "  pending transactions: %d\n", count);
3618
3619         print_binder_stats(m, "  ", &proc->stats);
3620 }
3621
3622
3623 static int binder_state_show(struct seq_file *m, void *unused)
3624 {
3625         struct binder_proc *proc;
3626         struct binder_node *node;
3627         int do_lock = !binder_debug_no_lock;
3628
3629         if (do_lock)
3630                 binder_lock(__func__);
3631
3632         seq_puts(m, "binder state:\n");
3633
3634         if (!hlist_empty(&binder_dead_nodes))
3635                 seq_puts(m, "dead nodes:\n");
3636         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3637                 print_binder_node(m, node);
3638
3639         hlist_for_each_entry(proc, &binder_procs, proc_node)
3640                 print_binder_proc(m, proc, 1);
3641         if (do_lock)
3642                 binder_unlock(__func__);
3643         return 0;
3644 }
3645
3646 static int binder_stats_show(struct seq_file *m, void *unused)
3647 {
3648         struct binder_proc *proc;
3649         int do_lock = !binder_debug_no_lock;
3650
3651         if (do_lock)
3652                 binder_lock(__func__);
3653
3654         seq_puts(m, "binder stats:\n");
3655
3656         print_binder_stats(m, "", &binder_stats);
3657
3658         hlist_for_each_entry(proc, &binder_procs, proc_node)
3659                 print_binder_proc_stats(m, proc);
3660         if (do_lock)
3661                 binder_unlock(__func__);
3662         return 0;
3663 }
3664
3665 static int binder_transactions_show(struct seq_file *m, void *unused)
3666 {
3667         struct binder_proc *proc;
3668         int do_lock = !binder_debug_no_lock;
3669
3670         if (do_lock)
3671                 binder_lock(__func__);
3672
3673         seq_puts(m, "binder transactions:\n");
3674         hlist_for_each_entry(proc, &binder_procs, proc_node)
3675                 print_binder_proc(m, proc, 0);
3676         if (do_lock)
3677                 binder_unlock(__func__);
3678         return 0;
3679 }
3680
3681 static int binder_proc_show(struct seq_file *m, void *unused)
3682 {
3683         struct binder_proc *itr;
3684         struct binder_proc *proc = m->private;
3685         int do_lock = !binder_debug_no_lock;
3686         bool valid_proc = false;
3687
3688         if (do_lock)
3689                 binder_lock(__func__);
3690
3691         hlist_for_each_entry(itr, &binder_procs, proc_node) {
3692                 if (itr == proc) {
3693                         valid_proc = true;
3694                         break;
3695                 }
3696         }
3697         if (valid_proc) {
3698                 seq_puts(m, "binder proc state:\n");
3699                 print_binder_proc(m, proc, 1);
3700         }
3701         if (do_lock)
3702                 binder_unlock(__func__);
3703         return 0;
3704 }
3705
3706 static void print_binder_transaction_log_entry(struct seq_file *m,
3707                                         struct binder_transaction_log_entry *e)
3708 {
3709         seq_printf(m,
3710                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3711                    e->debug_id, (e->call_type == 2) ? "reply" :
3712                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3713                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3714                    e->target_handle, e->data_size, e->offsets_size);
3715 }
3716
3717 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3718 {
3719         struct binder_transaction_log *log = m->private;
3720         int i;
3721
3722         if (log->full) {
3723                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3724                         print_binder_transaction_log_entry(m, &log->entry[i]);
3725         }
3726         for (i = 0; i < log->next; i++)
3727                 print_binder_transaction_log_entry(m, &log->entry[i]);
3728         return 0;
3729 }
3730
3731 static const struct file_operations binder_fops = {
3732         .owner = THIS_MODULE,
3733         .poll = binder_poll,
3734         .unlocked_ioctl = binder_ioctl,
3735         .compat_ioctl = binder_ioctl,
3736         .mmap = binder_mmap,
3737         .open = binder_open,
3738         .flush = binder_flush,
3739         .release = binder_release,
3740 };
3741
3742 static struct miscdevice binder_miscdev = {
3743         .minor = MISC_DYNAMIC_MINOR,
3744         .name = "binder",
3745         .fops = &binder_fops
3746 };
3747
3748 BINDER_DEBUG_ENTRY(state);
3749 BINDER_DEBUG_ENTRY(stats);
3750 BINDER_DEBUG_ENTRY(transactions);
3751 BINDER_DEBUG_ENTRY(transaction_log);
3752
3753 static int __init binder_init(void)
3754 {
3755         int ret;
3756
3757         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3758         if (binder_debugfs_dir_entry_root)
3759                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3760                                                  binder_debugfs_dir_entry_root);
3761         ret = misc_register(&binder_miscdev);
3762         if (binder_debugfs_dir_entry_root) {
3763                 debugfs_create_file("state",
3764                                     S_IRUGO,
3765                                     binder_debugfs_dir_entry_root,
3766                                     NULL,
3767                                     &binder_state_fops);
3768                 debugfs_create_file("stats",
3769                                     S_IRUGO,
3770                                     binder_debugfs_dir_entry_root,
3771                                     NULL,
3772                                     &binder_stats_fops);
3773                 debugfs_create_file("transactions",
3774                                     S_IRUGO,
3775                                     binder_debugfs_dir_entry_root,
3776                                     NULL,
3777                                     &binder_transactions_fops);
3778                 debugfs_create_file("transaction_log",
3779                                     S_IRUGO,
3780                                     binder_debugfs_dir_entry_root,
3781                                     &binder_transaction_log,
3782                                     &binder_transaction_log_fops);
3783                 debugfs_create_file("failed_transaction_log",
3784                                     S_IRUGO,
3785                                     binder_debugfs_dir_entry_root,
3786                                     &binder_transaction_log_failed,
3787                                     &binder_transaction_log_fops);
3788         }
3789         return ret;
3790 }
3791
3792 device_initcall(binder_init);
3793
3794 #define CREATE_TRACE_POINTS
3795 #include "binder_trace.h"
3796
3797 MODULE_LICENSE("GPL v2");