drivers/staging/android/binder.c

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