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, target_thread->proc->pid,
1202                                               target_thread->pid);
1203
1204                                 binder_pop_transaction(target_thread, t);
1205                                 target_thread->return_error = error_code;
1206                                 wake_up_interruptible(&target_thread->wait);
1207                         } else {
1208                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1209                                         target_thread->proc->pid,
1210                                         target_thread->pid,
1211                                         target_thread->return_error);
1212                         }
1213                         return;
1214                 }
1215                 next = t->from_parent;
1216
1217                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1218                              "send failed reply for transaction %d, target dead\n",
1219                              t->debug_id);
1220
1221                 binder_pop_transaction(target_thread, t);
1222                 if (next == NULL) {
1223                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1224                                      "reply failed, no target thread at root\n");
1225                         return;
1226                 }
1227                 t = next;
1228                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1229                              "reply failed, no target thread -- retry %d\n",
1230                               t->debug_id);
1231         }
1232 }
1233
1234 static void binder_transaction_buffer_release(struct binder_proc *proc,
1235                                               struct binder_buffer *buffer,
1236                                               binder_size_t *failed_at)
1237 {
1238         binder_size_t *offp, *off_end;
1239         int debug_id = buffer->debug_id;
1240
1241         binder_debug(BINDER_DEBUG_TRANSACTION,
1242                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1243                      proc->pid, buffer->debug_id,
1244                      buffer->data_size, buffer->offsets_size, failed_at);
1245
1246         if (buffer->target_node)
1247                 binder_dec_node(buffer->target_node, 1, 0);
1248
1249         offp = (binder_size_t *)(buffer->data +
1250                                  ALIGN(buffer->data_size, sizeof(void *)));
1251         if (failed_at)
1252                 off_end = failed_at;
1253         else
1254                 off_end = (void *)offp + buffer->offsets_size;
1255         for (; offp < off_end; offp++) {
1256                 struct flat_binder_object *fp;
1257
1258                 if (*offp > buffer->data_size - sizeof(*fp) ||
1259                     buffer->data_size < sizeof(*fp) ||
1260                     !IS_ALIGNED(*offp, sizeof(u32))) {
1261                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1262                                debug_id, (u64)*offp, buffer->data_size);
1263                         continue;
1264                 }
1265                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1266                 switch (fp->type) {
1267                 case BINDER_TYPE_BINDER:
1268                 case BINDER_TYPE_WEAK_BINDER: {
1269                         struct binder_node *node = binder_get_node(proc, fp->binder);
1270
1271                         if (node == NULL) {
1272                                 pr_err("transaction release %d bad node %016llx\n",
1273                                        debug_id, (u64)fp->binder);
1274                                 break;
1275                         }
1276                         binder_debug(BINDER_DEBUG_TRANSACTION,
1277                                      "        node %d u%016llx\n",
1278                                      node->debug_id, (u64)node->ptr);
1279                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1280                 } break;
1281                 case BINDER_TYPE_HANDLE:
1282                 case BINDER_TYPE_WEAK_HANDLE: {
1283                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1284
1285                         if (ref == NULL) {
1286                                 pr_err("transaction release %d bad handle %d\n",
1287                                  debug_id, fp->handle);
1288                                 break;
1289                         }
1290                         binder_debug(BINDER_DEBUG_TRANSACTION,
1291                                      "        ref %d desc %d (node %d)\n",
1292                                      ref->debug_id, ref->desc, ref->node->debug_id);
1293                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1294                 } break;
1295
1296                 case BINDER_TYPE_FD:
1297                         binder_debug(BINDER_DEBUG_TRANSACTION,
1298                                      "        fd %d\n", fp->handle);
1299                         if (failed_at)
1300                                 task_close_fd(proc, fp->handle);
1301                         break;
1302
1303                 default:
1304                         pr_err("transaction release %d bad object type %x\n",
1305                                 debug_id, fp->type);
1306                         break;
1307                 }
1308         }
1309 }
1310
1311 static void binder_transaction(struct binder_proc *proc,
1312                                struct binder_thread *thread,
1313                                struct binder_transaction_data *tr, int reply)
1314 {
1315         struct binder_transaction *t;
1316         struct binder_work *tcomplete;
1317         binder_size_t *offp, *off_end;
1318         struct binder_proc *target_proc;
1319         struct binder_thread *target_thread = NULL;
1320         struct binder_node *target_node = NULL;
1321         struct list_head *target_list;
1322         wait_queue_head_t *target_wait;
1323         struct binder_transaction *in_reply_to = NULL;
1324         struct binder_transaction_log_entry *e;
1325         uint32_t return_error;
1326
1327         e = binder_transaction_log_add(&binder_transaction_log);
1328         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1329         e->from_proc = proc->pid;
1330         e->from_thread = thread->pid;
1331         e->target_handle = tr->target.handle;
1332         e->data_size = tr->data_size;
1333         e->offsets_size = tr->offsets_size;
1334
1335         if (reply) {
1336                 in_reply_to = thread->transaction_stack;
1337                 if (in_reply_to == NULL) {
1338                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1339                                           proc->pid, thread->pid);
1340                         return_error = BR_FAILED_REPLY;
1341                         goto err_empty_call_stack;
1342                 }
1343                 binder_set_nice(in_reply_to->saved_priority);
1344                 if (in_reply_to->to_thread != thread) {
1345                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1346                                 proc->pid, thread->pid, in_reply_to->debug_id,
1347                                 in_reply_to->to_proc ?
1348                                 in_reply_to->to_proc->pid : 0,
1349                                 in_reply_to->to_thread ?
1350                                 in_reply_to->to_thread->pid : 0);
1351                         return_error = BR_FAILED_REPLY;
1352                         in_reply_to = NULL;
1353                         goto err_bad_call_stack;
1354                 }
1355                 thread->transaction_stack = in_reply_to->to_parent;
1356                 target_thread = in_reply_to->from;
1357                 if (target_thread == NULL) {
1358                         return_error = BR_DEAD_REPLY;
1359                         goto err_dead_binder;
1360                 }
1361                 if (target_thread->transaction_stack != in_reply_to) {
1362                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1363                                 proc->pid, thread->pid,
1364                                 target_thread->transaction_stack ?
1365                                 target_thread->transaction_stack->debug_id : 0,
1366                                 in_reply_to->debug_id);
1367                         return_error = BR_FAILED_REPLY;
1368                         in_reply_to = NULL;
1369                         target_thread = NULL;
1370                         goto err_dead_binder;
1371                 }
1372                 target_proc = target_thread->proc;
1373         } else {
1374                 if (tr->target.handle) {
1375                         struct binder_ref *ref;
1376
1377                         ref = binder_get_ref(proc, tr->target.handle);
1378                         if (ref == NULL) {
1379                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1380                                         proc->pid, thread->pid);
1381                                 return_error = BR_FAILED_REPLY;
1382                                 goto err_invalid_target_handle;
1383                         }
1384                         target_node = ref->node;
1385                 } else {
1386                         target_node = binder_context_mgr_node;
1387                         if (target_node == NULL) {
1388                                 return_error = BR_DEAD_REPLY;
1389                                 goto err_no_context_mgr_node;
1390                         }
1391                 }
1392                 e->to_node = target_node->debug_id;
1393                 target_proc = target_node->proc;
1394                 if (target_proc == NULL) {
1395                         return_error = BR_DEAD_REPLY;
1396                         goto err_dead_binder;
1397                 }
1398                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1399                         struct binder_transaction *tmp;
1400
1401                         tmp = thread->transaction_stack;
1402                         if (tmp->to_thread != thread) {
1403                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1404                                         proc->pid, thread->pid, tmp->debug_id,
1405                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1406                                         tmp->to_thread ?
1407                                         tmp->to_thread->pid : 0);
1408                                 return_error = BR_FAILED_REPLY;
1409                                 goto err_bad_call_stack;
1410                         }
1411                         while (tmp) {
1412                                 if (tmp->from && tmp->from->proc == target_proc)
1413                                         target_thread = tmp->from;
1414                                 tmp = tmp->from_parent;
1415                         }
1416                 }
1417         }
1418         if (target_thread) {
1419                 e->to_thread = target_thread->pid;
1420                 target_list = &target_thread->todo;
1421                 target_wait = &target_thread->wait;
1422         } else {
1423                 target_list = &target_proc->todo;
1424                 target_wait = &target_proc->wait;
1425         }
1426         e->to_proc = target_proc->pid;
1427
1428         /* TODO: reuse incoming transaction for reply */
1429         t = kzalloc(sizeof(*t), GFP_KERNEL);
1430         if (t == NULL) {
1431                 return_error = BR_FAILED_REPLY;
1432                 goto err_alloc_t_failed;
1433         }
1434         binder_stats_created(BINDER_STAT_TRANSACTION);
1435
1436         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1437         if (tcomplete == NULL) {
1438                 return_error = BR_FAILED_REPLY;
1439                 goto err_alloc_tcomplete_failed;
1440         }
1441         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1442
1443         t->debug_id = ++binder_last_id;
1444         e->debug_id = t->debug_id;
1445
1446         if (reply)
1447                 binder_debug(BINDER_DEBUG_TRANSACTION,
1448                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1449                              proc->pid, thread->pid, t->debug_id,
1450                              target_proc->pid, target_thread->pid,
1451                              (u64)tr->data.ptr.buffer,
1452                              (u64)tr->data.ptr.offsets,
1453                              (u64)tr->data_size, (u64)tr->offsets_size);
1454         else
1455                 binder_debug(BINDER_DEBUG_TRANSACTION,
1456                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1457                              proc->pid, thread->pid, t->debug_id,
1458                              target_proc->pid, target_node->debug_id,
1459                              (u64)tr->data.ptr.buffer,
1460                              (u64)tr->data.ptr.offsets,
1461                              (u64)tr->data_size, (u64)tr->offsets_size);
1462
1463         if (!reply && !(tr->flags & TF_ONE_WAY))
1464                 t->from = thread;
1465         else
1466                 t->from = NULL;
1467         t->sender_euid = task_euid(proc->tsk);
1468         t->to_proc = target_proc;
1469         t->to_thread = target_thread;
1470         t->code = tr->code;
1471         t->flags = tr->flags;
1472         t->priority = task_nice(current);
1473
1474         trace_binder_transaction(reply, t, target_node);
1475
1476         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1477                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1478         if (t->buffer == NULL) {
1479                 return_error = BR_FAILED_REPLY;
1480                 goto err_binder_alloc_buf_failed;
1481         }
1482         t->buffer->allow_user_free = 0;
1483         t->buffer->debug_id = t->debug_id;
1484         t->buffer->transaction = t;
1485         t->buffer->target_node = target_node;
1486         trace_binder_transaction_alloc_buf(t->buffer);
1487         if (target_node)
1488                 binder_inc_node(target_node, 1, 0, NULL);
1489
1490         offp = (binder_size_t *)(t->buffer->data +
1491                                  ALIGN(tr->data_size, sizeof(void *)));
1492
1493         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1494                            tr->data.ptr.buffer, tr->data_size)) {
1495                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1496                                 proc->pid, thread->pid);
1497                 return_error = BR_FAILED_REPLY;
1498                 goto err_copy_data_failed;
1499         }
1500         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1501                            tr->data.ptr.offsets, tr->offsets_size)) {
1502                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1503                                 proc->pid, thread->pid);
1504                 return_error = BR_FAILED_REPLY;
1505                 goto err_copy_data_failed;
1506         }
1507         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1508                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1509                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1510                 return_error = BR_FAILED_REPLY;
1511                 goto err_bad_offset;
1512         }
1513         off_end = (void *)offp + tr->offsets_size;
1514         for (; offp < off_end; offp++) {
1515                 struct flat_binder_object *fp;
1516
1517                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1518                     t->buffer->data_size < sizeof(*fp) ||
1519                     !IS_ALIGNED(*offp, sizeof(u32))) {
1520                         binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
1521                                           proc->pid, thread->pid, (u64)*offp);
1522                         return_error = BR_FAILED_REPLY;
1523                         goto err_bad_offset;
1524                 }
1525                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1526                 switch (fp->type) {
1527                 case BINDER_TYPE_BINDER:
1528                 case BINDER_TYPE_WEAK_BINDER: {
1529                         struct binder_ref *ref;
1530                         struct binder_node *node = binder_get_node(proc, fp->binder);
1531
1532                         if (node == NULL) {
1533                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1534                                 if (node == NULL) {
1535                                         return_error = BR_FAILED_REPLY;
1536                                         goto err_binder_new_node_failed;
1537                                 }
1538                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1539                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1540                         }
1541                         if (fp->cookie != node->cookie) {
1542                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1543                                         proc->pid, thread->pid,
1544                                         (u64)fp->binder, node->debug_id,
1545                                         (u64)fp->cookie, (u64)node->cookie);
1546                                 return_error = BR_FAILED_REPLY;
1547                                 goto err_binder_get_ref_for_node_failed;
1548                         }
1549                         ref = binder_get_ref_for_node(target_proc, node);
1550                         if (ref == NULL) {
1551                                 return_error = BR_FAILED_REPLY;
1552                                 goto err_binder_get_ref_for_node_failed;
1553                         }
1554                         if (fp->type == BINDER_TYPE_BINDER)
1555                                 fp->type = BINDER_TYPE_HANDLE;
1556                         else
1557                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1558                         fp->handle = ref->desc;
1559                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1560                                        &thread->todo);
1561
1562                         trace_binder_transaction_node_to_ref(t, node, ref);
1563                         binder_debug(BINDER_DEBUG_TRANSACTION,
1564                                      "        node %d u%016llx -> ref %d desc %d\n",
1565                                      node->debug_id, (u64)node->ptr,
1566                                      ref->debug_id, ref->desc);
1567                 } break;
1568                 case BINDER_TYPE_HANDLE:
1569                 case BINDER_TYPE_WEAK_HANDLE: {
1570                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1571
1572                         if (ref == NULL) {
1573                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1574                                                 proc->pid,
1575                                                 thread->pid, fp->handle);
1576                                 return_error = BR_FAILED_REPLY;
1577                                 goto err_binder_get_ref_failed;
1578                         }
1579                         if (ref->node->proc == target_proc) {
1580                                 if (fp->type == BINDER_TYPE_HANDLE)
1581                                         fp->type = BINDER_TYPE_BINDER;
1582                                 else
1583                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1584                                 fp->binder = ref->node->ptr;
1585                                 fp->cookie = ref->node->cookie;
1586                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1587                                 trace_binder_transaction_ref_to_node(t, ref);
1588                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1589                                              "        ref %d desc %d -> node %d u%016llx\n",
1590                                              ref->debug_id, ref->desc, ref->node->debug_id,
1591                                              (u64)ref->node->ptr);
1592                         } else {
1593                                 struct binder_ref *new_ref;
1594
1595                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1596                                 if (new_ref == NULL) {
1597                                         return_error = BR_FAILED_REPLY;
1598                                         goto err_binder_get_ref_for_node_failed;
1599                                 }
1600                                 fp->handle = new_ref->desc;
1601                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1602                                 trace_binder_transaction_ref_to_ref(t, ref,
1603                                                                     new_ref);
1604                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1605                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1606                                              ref->debug_id, ref->desc, new_ref->debug_id,
1607                                              new_ref->desc, ref->node->debug_id);
1608                         }
1609                 } break;
1610
1611                 case BINDER_TYPE_FD: {
1612                         int target_fd;
1613                         struct file *file;
1614
1615                         if (reply) {
1616                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1617                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1618                                                 proc->pid, thread->pid, fp->handle);
1619                                         return_error = BR_FAILED_REPLY;
1620                                         goto err_fd_not_allowed;
1621                                 }
1622                         } else if (!target_node->accept_fds) {
1623                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1624                                         proc->pid, thread->pid, fp->handle);
1625                                 return_error = BR_FAILED_REPLY;
1626                                 goto err_fd_not_allowed;
1627                         }
1628
1629                         file = fget(fp->handle);
1630                         if (file == NULL) {
1631                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1632                                         proc->pid, thread->pid, fp->handle);
1633                                 return_error = BR_FAILED_REPLY;
1634                                 goto err_fget_failed;
1635                         }
1636                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1637                         if (target_fd < 0) {
1638                                 fput(file);
1639                                 return_error = BR_FAILED_REPLY;
1640                                 goto err_get_unused_fd_failed;
1641                         }
1642                         task_fd_install(target_proc, target_fd, file);
1643                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1644                         binder_debug(BINDER_DEBUG_TRANSACTION,
1645                                      "        fd %d -> %d\n", fp->handle, target_fd);
1646                         /* TODO: fput? */
1647                         fp->handle = target_fd;
1648                 } break;
1649
1650                 default:
1651                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1652                                 proc->pid, thread->pid, fp->type);
1653                         return_error = BR_FAILED_REPLY;
1654                         goto err_bad_object_type;
1655                 }
1656         }
1657         if (reply) {
1658                 BUG_ON(t->buffer->async_transaction != 0);
1659                 binder_pop_transaction(target_thread, in_reply_to);
1660         } else if (!(t->flags & TF_ONE_WAY)) {
1661                 BUG_ON(t->buffer->async_transaction != 0);
1662                 t->need_reply = 1;
1663                 t->from_parent = thread->transaction_stack;
1664                 thread->transaction_stack = t;
1665         } else {
1666                 BUG_ON(target_node == NULL);
1667                 BUG_ON(t->buffer->async_transaction != 1);
1668                 if (target_node->has_async_transaction) {
1669                         target_list = &target_node->async_todo;
1670                         target_wait = NULL;
1671                 } else
1672                         target_node->has_async_transaction = 1;
1673         }
1674         t->work.type = BINDER_WORK_TRANSACTION;
1675         list_add_tail(&t->work.entry, target_list);
1676         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1677         list_add_tail(&tcomplete->entry, &thread->todo);
1678         if (target_wait)
1679                 wake_up_interruptible(target_wait);
1680         return;
1681
1682 err_get_unused_fd_failed:
1683 err_fget_failed:
1684 err_fd_not_allowed:
1685 err_binder_get_ref_for_node_failed:
1686 err_binder_get_ref_failed:
1687 err_binder_new_node_failed:
1688 err_bad_object_type:
1689 err_bad_offset:
1690 err_copy_data_failed:
1691         trace_binder_transaction_failed_buffer_release(t->buffer);
1692         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1693         t->buffer->transaction = NULL;
1694         binder_free_buf(target_proc, t->buffer);
1695 err_binder_alloc_buf_failed:
1696         kfree(tcomplete);
1697         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1698 err_alloc_tcomplete_failed:
1699         kfree(t);
1700         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1701 err_alloc_t_failed:
1702 err_bad_call_stack:
1703 err_empty_call_stack:
1704 err_dead_binder:
1705 err_invalid_target_handle:
1706 err_no_context_mgr_node:
1707         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1708                      "%d:%d transaction failed %d, size %lld-%lld\n",
1709                      proc->pid, thread->pid, return_error,
1710                      (u64)tr->data_size, (u64)tr->offsets_size);
1711
1712         {
1713                 struct binder_transaction_log_entry *fe;
1714
1715                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1716                 *fe = *e;
1717         }
1718
1719         BUG_ON(thread->return_error != BR_OK);
1720         if (in_reply_to) {
1721                 thread->return_error = BR_TRANSACTION_COMPLETE;
1722                 binder_send_failed_reply(in_reply_to, return_error);
1723         } else
1724                 thread->return_error = return_error;
1725 }
1726
1727 static int binder_thread_write(struct binder_proc *proc,
1728                         struct binder_thread *thread,
1729                         binder_uintptr_t binder_buffer, size_t size,
1730                         binder_size_t *consumed)
1731 {
1732         uint32_t cmd;
1733         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1734         void __user *ptr = buffer + *consumed;
1735         void __user *end = buffer + size;
1736
1737         while (ptr < end && thread->return_error == BR_OK) {
1738                 if (get_user(cmd, (uint32_t __user *)ptr))
1739                         return -EFAULT;
1740                 ptr += sizeof(uint32_t);
1741                 trace_binder_command(cmd);
1742                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1743                         binder_stats.bc[_IOC_NR(cmd)]++;
1744                         proc->stats.bc[_IOC_NR(cmd)]++;
1745                         thread->stats.bc[_IOC_NR(cmd)]++;
1746                 }
1747                 switch (cmd) {
1748                 case BC_INCREFS:
1749                 case BC_ACQUIRE:
1750                 case BC_RELEASE:
1751                 case BC_DECREFS: {
1752                         uint32_t target;
1753                         struct binder_ref *ref;
1754                         const char *debug_string;
1755
1756                         if (get_user(target, (uint32_t __user *)ptr))
1757                                 return -EFAULT;
1758                         ptr += sizeof(uint32_t);
1759                         if (target == 0 && binder_context_mgr_node &&
1760                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1761                                 ref = binder_get_ref_for_node(proc,
1762                                                binder_context_mgr_node);
1763                                 if (ref->desc != target) {
1764                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1765                                                 proc->pid, thread->pid,
1766                                                 ref->desc);
1767                                 }
1768                         } else
1769                                 ref = binder_get_ref(proc, target);
1770                         if (ref == NULL) {
1771                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1772                                         proc->pid, thread->pid, target);
1773                                 break;
1774                         }
1775                         switch (cmd) {
1776                         case BC_INCREFS:
1777                                 debug_string = "IncRefs";
1778                                 binder_inc_ref(ref, 0, NULL);
1779                                 break;
1780                         case BC_ACQUIRE:
1781                                 debug_string = "Acquire";
1782                                 binder_inc_ref(ref, 1, NULL);
1783                                 break;
1784                         case BC_RELEASE:
1785                                 debug_string = "Release";
1786                                 binder_dec_ref(ref, 1);
1787                                 break;
1788                         case BC_DECREFS:
1789                         default:
1790                                 debug_string = "DecRefs";
1791                                 binder_dec_ref(ref, 0);
1792                                 break;
1793                         }
1794                         binder_debug(BINDER_DEBUG_USER_REFS,
1795                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1796                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1797                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1798                         break;
1799                 }
1800                 case BC_INCREFS_DONE:
1801                 case BC_ACQUIRE_DONE: {
1802                         binder_uintptr_t node_ptr;
1803                         binder_uintptr_t cookie;
1804                         struct binder_node *node;
1805
1806                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1807                                 return -EFAULT;
1808                         ptr += sizeof(binder_uintptr_t);
1809                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1810                                 return -EFAULT;
1811                         ptr += sizeof(binder_uintptr_t);
1812                         node = binder_get_node(proc, node_ptr);
1813                         if (node == NULL) {
1814                                 binder_user_error("%d:%d %s u%016llx no match\n",
1815                                         proc->pid, thread->pid,
1816                                         cmd == BC_INCREFS_DONE ?
1817                                         "BC_INCREFS_DONE" :
1818                                         "BC_ACQUIRE_DONE",
1819                                         (u64)node_ptr);
1820                                 break;
1821                         }
1822                         if (cookie != node->cookie) {
1823                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1824                                         proc->pid, thread->pid,
1825                                         cmd == BC_INCREFS_DONE ?
1826                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1827                                         (u64)node_ptr, node->debug_id,
1828                                         (u64)cookie, (u64)node->cookie);
1829                                 break;
1830                         }
1831                         if (cmd == BC_ACQUIRE_DONE) {
1832                                 if (node->pending_strong_ref == 0) {
1833                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1834                                                 proc->pid, thread->pid,
1835                                                 node->debug_id);
1836                                         break;
1837                                 }
1838                                 node->pending_strong_ref = 0;
1839                         } else {
1840                                 if (node->pending_weak_ref == 0) {
1841                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1842                                                 proc->pid, thread->pid,
1843                                                 node->debug_id);
1844                                         break;
1845                                 }
1846                                 node->pending_weak_ref = 0;
1847                         }
1848                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1849                         binder_debug(BINDER_DEBUG_USER_REFS,
1850                                      "%d:%d %s node %d ls %d lw %d\n",
1851                                      proc->pid, thread->pid,
1852                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1853                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1854                         break;
1855                 }
1856                 case BC_ATTEMPT_ACQUIRE:
1857                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1858                         return -EINVAL;
1859                 case BC_ACQUIRE_RESULT:
1860                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1861                         return -EINVAL;
1862
1863                 case BC_FREE_BUFFER: {
1864                         binder_uintptr_t data_ptr;
1865                         struct binder_buffer *buffer;
1866
1867                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1868                                 return -EFAULT;
1869                         ptr += sizeof(binder_uintptr_t);
1870
1871                         buffer = binder_buffer_lookup(proc, data_ptr);
1872                         if (buffer == NULL) {
1873                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1874                                         proc->pid, thread->pid, (u64)data_ptr);
1875                                 break;
1876                         }
1877                         if (!buffer->allow_user_free) {
1878                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1879                                         proc->pid, thread->pid, (u64)data_ptr);
1880                                 break;
1881                         }
1882                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1883                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1884                                      proc->pid, thread->pid, (u64)data_ptr,
1885                                      buffer->debug_id,
1886                                      buffer->transaction ? "active" : "finished");
1887
1888                         if (buffer->transaction) {
1889                                 buffer->transaction->buffer = NULL;
1890                                 buffer->transaction = NULL;
1891                         }
1892                         if (buffer->async_transaction && buffer->target_node) {
1893                                 BUG_ON(!buffer->target_node->has_async_transaction);
1894                                 if (list_empty(&buffer->target_node->async_todo))
1895                                         buffer->target_node->has_async_transaction = 0;
1896                                 else
1897                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1898                         }
1899                         trace_binder_transaction_buffer_release(buffer);
1900                         binder_transaction_buffer_release(proc, buffer, NULL);
1901                         binder_free_buf(proc, buffer);
1902                         break;
1903                 }
1904
1905                 case BC_TRANSACTION:
1906                 case BC_REPLY: {
1907                         struct binder_transaction_data tr;
1908
1909                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1910                                 return -EFAULT;
1911                         ptr += sizeof(tr);
1912                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1913                         break;
1914                 }
1915
1916                 case BC_REGISTER_LOOPER:
1917                         binder_debug(BINDER_DEBUG_THREADS,
1918                                      "%d:%d BC_REGISTER_LOOPER\n",
1919                                      proc->pid, thread->pid);
1920                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1921                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1922                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1923                                         proc->pid, thread->pid);
1924                         } else if (proc->requested_threads == 0) {
1925                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1926                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1927                                         proc->pid, thread->pid);
1928                         } else {
1929                                 proc->requested_threads--;
1930                                 proc->requested_threads_started++;
1931                         }
1932                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1933                         break;
1934                 case BC_ENTER_LOOPER:
1935                         binder_debug(BINDER_DEBUG_THREADS,
1936                                      "%d:%d BC_ENTER_LOOPER\n",
1937                                      proc->pid, thread->pid);
1938                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1939                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1940                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1941                                         proc->pid, thread->pid);
1942                         }
1943                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1944                         break;
1945                 case BC_EXIT_LOOPER:
1946                         binder_debug(BINDER_DEBUG_THREADS,
1947                                      "%d:%d BC_EXIT_LOOPER\n",
1948                                      proc->pid, thread->pid);
1949                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
1950                         break;
1951
1952                 case BC_REQUEST_DEATH_NOTIFICATION:
1953                 case BC_CLEAR_DEATH_NOTIFICATION: {
1954                         uint32_t target;
1955                         binder_uintptr_t cookie;
1956                         struct binder_ref *ref;
1957                         struct binder_ref_death *death;
1958
1959                         if (get_user(target, (uint32_t __user *)ptr))
1960                                 return -EFAULT;
1961                         ptr += sizeof(uint32_t);
1962                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1963                                 return -EFAULT;
1964                         ptr += sizeof(binder_uintptr_t);
1965                         ref = binder_get_ref(proc, target);
1966                         if (ref == NULL) {
1967                                 binder_user_error("%d:%d %s invalid ref %d\n",
1968                                         proc->pid, thread->pid,
1969                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1970                                         "BC_REQUEST_DEATH_NOTIFICATION" :
1971                                         "BC_CLEAR_DEATH_NOTIFICATION",
1972                                         target);
1973                                 break;
1974                         }
1975
1976                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
1977                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
1978                                      proc->pid, thread->pid,
1979                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1980                                      "BC_REQUEST_DEATH_NOTIFICATION" :
1981                                      "BC_CLEAR_DEATH_NOTIFICATION",
1982                                      (u64)cookie, ref->debug_id, ref->desc,
1983                                      ref->strong, ref->weak, ref->node->debug_id);
1984
1985                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
1986                                 if (ref->death) {
1987                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
1988                                                 proc->pid, thread->pid);
1989                                         break;
1990                                 }
1991                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
1992                                 if (death == NULL) {
1993                                         thread->return_error = BR_ERROR;
1994                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1995                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
1996                                                      proc->pid, thread->pid);
1997                                         break;
1998                                 }
1999                                 binder_stats_created(BINDER_STAT_DEATH);
2000                                 INIT_LIST_HEAD(&death->work.entry);
2001                                 death->cookie = cookie;
2002                                 ref->death = death;
2003                                 if (ref->node->proc == NULL) {
2004                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2005                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2006                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2007                                         } else {
2008                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2009                                                 wake_up_interruptible(&proc->wait);
2010                                         }
2011                                 }
2012                         } else {
2013                                 if (ref->death == NULL) {
2014                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2015                                                 proc->pid, thread->pid);
2016                                         break;
2017                                 }
2018                                 death = ref->death;
2019                                 if (death->cookie != cookie) {
2020                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2021                                                 proc->pid, thread->pid,
2022                                                 (u64)death->cookie,
2023                                                 (u64)cookie);
2024                                         break;
2025                                 }
2026                                 ref->death = NULL;
2027                                 if (list_empty(&death->work.entry)) {
2028                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2029                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2030                                                 list_add_tail(&death->work.entry, &thread->todo);
2031                                         } else {
2032                                                 list_add_tail(&death->work.entry, &proc->todo);
2033                                                 wake_up_interruptible(&proc->wait);
2034                                         }
2035                                 } else {
2036                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2037                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2038                                 }
2039                         }
2040                 } break;
2041                 case BC_DEAD_BINDER_DONE: {
2042                         struct binder_work *w;
2043                         binder_uintptr_t cookie;
2044                         struct binder_ref_death *death = NULL;
2045
2046                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2047                                 return -EFAULT;
2048
2049                         ptr += sizeof(void *);
2050                         list_for_each_entry(w, &proc->delivered_death, entry) {
2051                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2052
2053                                 if (tmp_death->cookie == cookie) {
2054                                         death = tmp_death;
2055                                         break;
2056                                 }
2057                         }
2058                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2059                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2060                                      proc->pid, thread->pid, (u64)cookie,
2061                                      death);
2062                         if (death == NULL) {
2063                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2064                                         proc->pid, thread->pid, (u64)cookie);
2065                                 break;
2066                         }
2067
2068                         list_del_init(&death->work.entry);
2069                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2070                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2071                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2072                                         list_add_tail(&death->work.entry, &thread->todo);
2073                                 } else {
2074                                         list_add_tail(&death->work.entry, &proc->todo);
2075                                         wake_up_interruptible(&proc->wait);
2076                                 }
2077                         }
2078                 } break;
2079
2080                 default:
2081                         pr_err("%d:%d unknown command %d\n",
2082                                proc->pid, thread->pid, cmd);
2083                         return -EINVAL;
2084                 }
2085                 *consumed = ptr - buffer;
2086         }
2087         return 0;
2088 }
2089
2090 static void binder_stat_br(struct binder_proc *proc,
2091                            struct binder_thread *thread, uint32_t cmd)
2092 {
2093         trace_binder_return(cmd);
2094         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2095                 binder_stats.br[_IOC_NR(cmd)]++;
2096                 proc->stats.br[_IOC_NR(cmd)]++;
2097                 thread->stats.br[_IOC_NR(cmd)]++;
2098         }
2099 }
2100
2101 static int binder_has_proc_work(struct binder_proc *proc,
2102                                 struct binder_thread *thread)
2103 {
2104         return !list_empty(&proc->todo) ||
2105                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2106 }
2107
2108 static int binder_has_thread_work(struct binder_thread *thread)
2109 {
2110         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2111                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2112 }
2113
2114 static int binder_thread_read(struct binder_proc *proc,
2115                               struct binder_thread *thread,
2116                               binder_uintptr_t binder_buffer, size_t size,
2117                               binder_size_t *consumed, int non_block)
2118 {
2119         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2120         void __user *ptr = buffer + *consumed;
2121         void __user *end = buffer + size;
2122
2123         int ret = 0;
2124         int wait_for_proc_work;
2125
2126         if (*consumed == 0) {
2127                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2128                         return -EFAULT;
2129                 ptr += sizeof(uint32_t);
2130         }
2131
2132 retry:
2133         wait_for_proc_work = thread->transaction_stack == NULL &&
2134                                 list_empty(&thread->todo);
2135
2136         if (thread->return_error != BR_OK && ptr < end) {
2137                 if (thread->return_error2 != BR_OK) {
2138                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2139                                 return -EFAULT;
2140                         ptr += sizeof(uint32_t);
2141                         binder_stat_br(proc, thread, thread->return_error2);
2142                         if (ptr == end)
2143                                 goto done;
2144                         thread->return_error2 = BR_OK;
2145                 }
2146                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2147                         return -EFAULT;
2148                 ptr += sizeof(uint32_t);
2149                 binder_stat_br(proc, thread, thread->return_error);
2150                 thread->return_error = BR_OK;
2151                 goto done;
2152         }
2153
2154
2155         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2156         if (wait_for_proc_work)
2157                 proc->ready_threads++;
2158
2159         binder_unlock(__func__);
2160
2161         trace_binder_wait_for_work(wait_for_proc_work,
2162                                    !!thread->transaction_stack,
2163                                    !list_empty(&thread->todo));
2164         if (wait_for_proc_work) {
2165                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2166                                         BINDER_LOOPER_STATE_ENTERED))) {
2167                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2168                                 proc->pid, thread->pid, thread->looper);
2169                         wait_event_interruptible(binder_user_error_wait,
2170                                                  binder_stop_on_user_error < 2);
2171                 }
2172                 binder_set_nice(proc->default_priority);
2173                 if (non_block) {
2174                         if (!binder_has_proc_work(proc, thread))
2175                                 ret = -EAGAIN;
2176                 } else
2177                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2178         } else {
2179                 if (non_block) {
2180                         if (!binder_has_thread_work(thread))
2181                                 ret = -EAGAIN;
2182                 } else
2183                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2184         }
2185
2186         binder_lock(__func__);
2187
2188         if (wait_for_proc_work)
2189                 proc->ready_threads--;
2190         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2191
2192         if (ret)
2193                 return ret;
2194
2195         while (1) {
2196                 uint32_t cmd;
2197                 struct binder_transaction_data tr;
2198                 struct binder_work *w;
2199                 struct binder_transaction *t = NULL;
2200
2201                 if (!list_empty(&thread->todo))
2202                         w = list_first_entry(&thread->todo, struct binder_work, entry);
2203                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
2204                         w = list_first_entry(&proc->todo, struct binder_work, entry);
2205                 else {
2206                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
2207                                 goto retry;
2208                         break;
2209                 }
2210
2211                 if (end - ptr < sizeof(tr) + 4)
2212                         break;
2213
2214                 switch (w->type) {
2215                 case BINDER_WORK_TRANSACTION: {
2216                         t = container_of(w, struct binder_transaction, work);
2217                 } break;
2218                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2219                         cmd = BR_TRANSACTION_COMPLETE;
2220                         if (put_user(cmd, (uint32_t __user *)ptr))
2221                                 return -EFAULT;
2222                         ptr += sizeof(uint32_t);
2223
2224                         binder_stat_br(proc, thread, cmd);
2225                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2226                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2227                                      proc->pid, thread->pid);
2228
2229                         list_del(&w->entry);
2230                         kfree(w);
2231                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2232                 } break;
2233                 case BINDER_WORK_NODE: {
2234                         struct binder_node *node = container_of(w, struct binder_node, work);
2235                         uint32_t cmd = BR_NOOP;
2236                         const char *cmd_name;
2237                         int strong = node->internal_strong_refs || node->local_strong_refs;
2238                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2239
2240                         if (weak && !node->has_weak_ref) {
2241                                 cmd = BR_INCREFS;
2242                                 cmd_name = "BR_INCREFS";
2243                                 node->has_weak_ref = 1;
2244                                 node->pending_weak_ref = 1;
2245                                 node->local_weak_refs++;
2246                         } else if (strong && !node->has_strong_ref) {
2247                                 cmd = BR_ACQUIRE;
2248                                 cmd_name = "BR_ACQUIRE";
2249                                 node->has_strong_ref = 1;
2250                                 node->pending_strong_ref = 1;
2251                                 node->local_strong_refs++;
2252                         } else if (!strong && node->has_strong_ref) {
2253                                 cmd = BR_RELEASE;
2254                                 cmd_name = "BR_RELEASE";
2255                                 node->has_strong_ref = 0;
2256                         } else if (!weak && node->has_weak_ref) {
2257                                 cmd = BR_DECREFS;
2258                                 cmd_name = "BR_DECREFS";
2259                                 node->has_weak_ref = 0;
2260                         }
2261                         if (cmd != BR_NOOP) {
2262                                 if (put_user(cmd, (uint32_t __user *)ptr))
2263                                         return -EFAULT;
2264                                 ptr += sizeof(uint32_t);
2265                                 if (put_user(node->ptr,
2266                                              (binder_uintptr_t __user *)ptr))
2267                                         return -EFAULT;
2268                                 ptr += sizeof(binder_uintptr_t);
2269                                 if (put_user(node->cookie,
2270                                              (binder_uintptr_t __user *)ptr))
2271                                         return -EFAULT;
2272                                 ptr += sizeof(binder_uintptr_t);
2273
2274                                 binder_stat_br(proc, thread, cmd);
2275                                 binder_debug(BINDER_DEBUG_USER_REFS,
2276                                              "%d:%d %s %d u%016llx c%016llx\n",
2277                                              proc->pid, thread->pid, cmd_name,
2278                                              node->debug_id,
2279                                              (u64)node->ptr, (u64)node->cookie);
2280                         } else {
2281                                 list_del_init(&w->entry);
2282                                 if (!weak && !strong) {
2283                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2284                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2285                                                      proc->pid, thread->pid,
2286                                                      node->debug_id,
2287                                                      (u64)node->ptr,
2288                                                      (u64)node->cookie);
2289                                         rb_erase(&node->rb_node, &proc->nodes);
2290                                         kfree(node);
2291                                         binder_stats_deleted(BINDER_STAT_NODE);
2292                                 } else {
2293                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2294                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2295                                                      proc->pid, thread->pid,
2296                                                      node->debug_id,
2297                                                      (u64)node->ptr,
2298                                                      (u64)node->cookie);
2299                                 }
2300                         }
2301                 } break;
2302                 case BINDER_WORK_DEAD_BINDER:
2303                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2304                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2305                         struct binder_ref_death *death;
2306                         uint32_t cmd;
2307
2308                         death = container_of(w, struct binder_ref_death, work);
2309                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2310                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2311                         else
2312                                 cmd = BR_DEAD_BINDER;
2313                         if (put_user(cmd, (uint32_t __user *)ptr))
2314                                 return -EFAULT;
2315                         ptr += sizeof(uint32_t);
2316                         if (put_user(death->cookie,
2317                                      (binder_uintptr_t __user *)ptr))
2318                                 return -EFAULT;
2319                         ptr += sizeof(binder_uintptr_t);
2320                         binder_stat_br(proc, thread, cmd);
2321                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2322                                      "%d:%d %s %016llx\n",
2323                                       proc->pid, thread->pid,
2324                                       cmd == BR_DEAD_BINDER ?
2325                                       "BR_DEAD_BINDER" :
2326                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2327                                       (u64)death->cookie);
2328
2329                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2330                                 list_del(&w->entry);
2331                                 kfree(death);
2332                                 binder_stats_deleted(BINDER_STAT_DEATH);
2333                         } else
2334                                 list_move(&w->entry, &proc->delivered_death);
2335                         if (cmd == BR_DEAD_BINDER)
2336                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2337                 } break;
2338                 }
2339
2340                 if (!t)
2341                         continue;
2342
2343                 BUG_ON(t->buffer == NULL);
2344                 if (t->buffer->target_node) {
2345                         struct binder_node *target_node = t->buffer->target_node;
2346
2347                         tr.target.ptr = target_node->ptr;
2348                         tr.cookie =  target_node->cookie;
2349                         t->saved_priority = task_nice(current);
2350                         if (t->priority < target_node->min_priority &&
2351                             !(t->flags & TF_ONE_WAY))
2352                                 binder_set_nice(t->priority);
2353                         else if (!(t->flags & TF_ONE_WAY) ||
2354                                  t->saved_priority > target_node->min_priority)
2355                                 binder_set_nice(target_node->min_priority);
2356                         cmd = BR_TRANSACTION;
2357                 } else {
2358                         tr.target.ptr = 0;
2359                         tr.cookie = 0;
2360                         cmd = BR_REPLY;
2361                 }
2362                 tr.code = t->code;
2363                 tr.flags = t->flags;
2364                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2365
2366                 if (t->from) {
2367                         struct task_struct *sender = t->from->proc->tsk;
2368
2369                         tr.sender_pid = task_tgid_nr_ns(sender,
2370                                                         task_active_pid_ns(current));
2371                 } else {
2372                         tr.sender_pid = 0;
2373                 }
2374
2375                 tr.data_size = t->buffer->data_size;
2376                 tr.offsets_size = t->buffer->offsets_size;
2377                 tr.data.ptr.buffer = (binder_uintptr_t)(
2378                                         (uintptr_t)t->buffer->data +
2379                                         proc->user_buffer_offset);
2380                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2381                                         ALIGN(t->buffer->data_size,
2382                                             sizeof(void *));
2383
2384                 if (put_user(cmd, (uint32_t __user *)ptr))
2385                         return -EFAULT;
2386                 ptr += sizeof(uint32_t);
2387                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2388                         return -EFAULT;
2389                 ptr += sizeof(tr);
2390
2391                 trace_binder_transaction_received(t);
2392                 binder_stat_br(proc, thread, cmd);
2393                 binder_debug(BINDER_DEBUG_TRANSACTION,
2394                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2395                              proc->pid, thread->pid,
2396                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2397                              "BR_REPLY",
2398                              t->debug_id, t->from ? t->from->proc->pid : 0,
2399                              t->from ? t->from->pid : 0, cmd,
2400                              t->buffer->data_size, t->buffer->offsets_size,
2401                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2402
2403                 list_del(&t->work.entry);
2404                 t->buffer->allow_user_free = 1;
2405                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2406                         t->to_parent = thread->transaction_stack;
2407                         t->to_thread = thread;
2408                         thread->transaction_stack = t;
2409                 } else {
2410                         t->buffer->transaction = NULL;
2411                         kfree(t);
2412                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2413                 }
2414                 break;
2415         }
2416
2417 done:
2418
2419         *consumed = ptr - buffer;
2420         if (proc->requested_threads + proc->ready_threads == 0 &&
2421             proc->requested_threads_started < proc->max_threads &&
2422             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2423              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2424              /*spawn a new thread if we leave this out */) {
2425                 proc->requested_threads++;
2426                 binder_debug(BINDER_DEBUG_THREADS,
2427                              "%d:%d BR_SPAWN_LOOPER\n",
2428                              proc->pid, thread->pid);
2429                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2430                         return -EFAULT;
2431                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2432         }
2433         return 0;
2434 }
2435
2436 static void binder_release_work(struct list_head *list)
2437 {
2438         struct binder_work *w;
2439
2440         while (!list_empty(list)) {
2441                 w = list_first_entry(list, struct binder_work, entry);
2442                 list_del_init(&w->entry);
2443                 switch (w->type) {
2444                 case BINDER_WORK_TRANSACTION: {
2445                         struct binder_transaction *t;
2446
2447                         t = container_of(w, struct binder_transaction, work);
2448                         if (t->buffer->target_node &&
2449                             !(t->flags & TF_ONE_WAY)) {
2450                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2451                         } else {
2452                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2453                                         "undelivered transaction %d\n",
2454                                         t->debug_id);
2455                                 t->buffer->transaction = NULL;
2456                                 kfree(t);
2457                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2458                         }
2459                 } break;
2460                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2461                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2462                                 "undelivered TRANSACTION_COMPLETE\n");
2463                         kfree(w);
2464                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2465                 } break;
2466                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2467                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2468                         struct binder_ref_death *death;
2469
2470                         death = container_of(w, struct binder_ref_death, work);
2471                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2472                                 "undelivered death notification, %016llx\n",
2473                                 (u64)death->cookie);
2474                         kfree(death);
2475                         binder_stats_deleted(BINDER_STAT_DEATH);
2476                 } break;
2477                 default:
2478                         pr_err("unexpected work type, %d, not freed\n",
2479                                w->type);
2480                         break;
2481                 }
2482         }
2483
2484 }
2485
2486 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2487 {
2488         struct binder_thread *thread = NULL;
2489         struct rb_node *parent = NULL;
2490         struct rb_node **p = &proc->threads.rb_node;
2491
2492         while (*p) {
2493                 parent = *p;
2494                 thread = rb_entry(parent, struct binder_thread, rb_node);
2495
2496                 if (current->pid < thread->pid)
2497                         p = &(*p)->rb_left;
2498                 else if (current->pid > thread->pid)
2499                         p = &(*p)->rb_right;
2500                 else
2501                         break;
2502         }
2503         if (*p == NULL) {
2504                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2505                 if (thread == NULL)
2506                         return NULL;
2507                 binder_stats_created(BINDER_STAT_THREAD);
2508                 thread->proc = proc;
2509                 thread->pid = current->pid;
2510                 init_waitqueue_head(&thread->wait);
2511                 INIT_LIST_HEAD(&thread->todo);
2512                 rb_link_node(&thread->rb_node, parent, p);
2513                 rb_insert_color(&thread->rb_node, &proc->threads);
2514                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2515                 thread->return_error = BR_OK;
2516                 thread->return_error2 = BR_OK;
2517         }
2518         return thread;
2519 }
2520
2521 static int binder_free_thread(struct binder_proc *proc,
2522                               struct binder_thread *thread)
2523 {
2524         struct binder_transaction *t;
2525         struct binder_transaction *send_reply = NULL;
2526         int active_transactions = 0;
2527
2528         rb_erase(&thread->rb_node, &proc->threads);
2529         t = thread->transaction_stack;
2530         if (t && t->to_thread == thread)
2531                 send_reply = t;
2532         while (t) {
2533                 active_transactions++;
2534                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2535                              "release %d:%d transaction %d %s, still active\n",
2536                               proc->pid, thread->pid,
2537                              t->debug_id,
2538                              (t->to_thread == thread) ? "in" : "out");
2539
2540                 if (t->to_thread == thread) {
2541                         t->to_proc = NULL;
2542                         t->to_thread = NULL;
2543                         if (t->buffer) {
2544                                 t->buffer->transaction = NULL;
2545                                 t->buffer = NULL;
2546                         }
2547                         t = t->to_parent;
2548                 } else if (t->from == thread) {
2549                         t->from = NULL;
2550                         t = t->from_parent;
2551                 } else
2552                         BUG();
2553         }
2554         if (send_reply)
2555                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2556         binder_release_work(&thread->todo);
2557         kfree(thread);
2558         binder_stats_deleted(BINDER_STAT_THREAD);
2559         return active_transactions;
2560 }
2561
2562 static unsigned int binder_poll(struct file *filp,
2563                                 struct poll_table_struct *wait)
2564 {
2565         struct binder_proc *proc = filp->private_data;
2566         struct binder_thread *thread = NULL;
2567         int wait_for_proc_work;
2568
2569         binder_lock(__func__);
2570
2571         thread = binder_get_thread(proc);
2572
2573         wait_for_proc_work = thread->transaction_stack == NULL &&
2574                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2575
2576         binder_unlock(__func__);
2577
2578         if (wait_for_proc_work) {
2579                 if (binder_has_proc_work(proc, thread))
2580                         return POLLIN;
2581                 poll_wait(filp, &proc->wait, wait);
2582                 if (binder_has_proc_work(proc, thread))
2583                         return POLLIN;
2584         } else {
2585                 if (binder_has_thread_work(thread))
2586                         return POLLIN;
2587                 poll_wait(filp, &thread->wait, wait);
2588                 if (binder_has_thread_work(thread))
2589                         return POLLIN;
2590         }
2591         return 0;
2592 }
2593
2594 static int binder_ioctl_write_read(struct file *filp,
2595                                 unsigned int cmd, unsigned long arg,
2596                                 struct binder_thread *thread)
2597 {
2598         int ret = 0;
2599         struct binder_proc *proc = filp->private_data;
2600         unsigned int size = _IOC_SIZE(cmd);
2601         void __user *ubuf = (void __user *)arg;
2602         struct binder_write_read bwr;
2603
2604         if (size != sizeof(struct binder_write_read)) {
2605                 ret = -EINVAL;
2606                 goto out;
2607         }
2608         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2609                 ret = -EFAULT;
2610                 goto out;
2611         }
2612         binder_debug(BINDER_DEBUG_READ_WRITE,
2613                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2614                      proc->pid, thread->pid,
2615                      (u64)bwr.write_size, (u64)bwr.write_buffer,
2616                      (u64)bwr.read_size, (u64)bwr.read_buffer);
2617
2618         if (bwr.write_size > 0) {
2619                 ret = binder_thread_write(proc, thread,
2620                                           bwr.write_buffer,
2621                                           bwr.write_size,
2622                                           &bwr.write_consumed);
2623                 trace_binder_write_done(ret);
2624                 if (ret < 0) {
2625                         bwr.read_consumed = 0;
2626                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2627                                 ret = -EFAULT;
2628                         goto out;
2629                 }
2630         }
2631         if (bwr.read_size > 0) {
2632                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2633                                          bwr.read_size,
2634                                          &bwr.read_consumed,
2635                                          filp->f_flags & O_NONBLOCK);
2636                 trace_binder_read_done(ret);
2637                 if (!list_empty(&proc->todo))
2638                         wake_up_interruptible(&proc->wait);
2639                 if (ret < 0) {
2640                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2641                                 ret = -EFAULT;
2642                         goto out;
2643                 }
2644         }
2645         binder_debug(BINDER_DEBUG_READ_WRITE,
2646                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2647                      proc->pid, thread->pid,
2648                      (u64)bwr.write_consumed, (u64)bwr.write_size,
2649                      (u64)bwr.read_consumed, (u64)bwr.read_size);
2650         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2651                 ret = -EFAULT;
2652                 goto out;
2653         }
2654 out:
2655         return ret;
2656 }
2657
2658 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2659 {
2660         int ret = 0;
2661         struct binder_proc *proc = filp->private_data;
2662         kuid_t curr_euid = current_euid();
2663
2664         if (binder_context_mgr_node != NULL) {
2665                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2666                 ret = -EBUSY;
2667                 goto out;
2668         }
2669         if (uid_valid(binder_context_mgr_uid)) {
2670                 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2671                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2672                                from_kuid(&init_user_ns, curr_euid),
2673                                from_kuid(&init_user_ns,
2674                                         binder_context_mgr_uid));
2675                         ret = -EPERM;
2676                         goto out;
2677                 }
2678         } else {
2679                 binder_context_mgr_uid = curr_euid;
2680         }
2681         binder_context_mgr_node = binder_new_node(proc, 0, 0);
2682         if (binder_context_mgr_node == NULL) {
2683                 ret = -ENOMEM;
2684                 goto out;
2685         }
2686         binder_context_mgr_node->local_weak_refs++;
2687         binder_context_mgr_node->local_strong_refs++;
2688         binder_context_mgr_node->has_strong_ref = 1;
2689         binder_context_mgr_node->has_weak_ref = 1;
2690 out:
2691         return ret;
2692 }
2693
2694 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2695 {
2696         int ret;
2697         struct binder_proc *proc = filp->private_data;
2698         struct binder_thread *thread;
2699         unsigned int size = _IOC_SIZE(cmd);
2700         void __user *ubuf = (void __user *)arg;
2701
2702         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2703                         proc->pid, current->pid, cmd, arg);*/
2704
2705         trace_binder_ioctl(cmd, arg);
2706
2707         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2708         if (ret)
2709                 goto err_unlocked;
2710
2711         binder_lock(__func__);
2712         thread = binder_get_thread(proc);
2713         if (thread == NULL) {
2714                 ret = -ENOMEM;
2715                 goto err;
2716         }
2717
2718         switch (cmd) {
2719         case BINDER_WRITE_READ:
2720                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2721                 if (ret)
2722                         goto err;
2723                 break;
2724         case BINDER_SET_MAX_THREADS:
2725                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2726                         ret = -EINVAL;
2727                         goto err;
2728                 }
2729                 break;
2730         case BINDER_SET_CONTEXT_MGR:
2731                 ret = binder_ioctl_set_ctx_mgr(filp);
2732                 if (ret)
2733                         goto err;
2734                 break;
2735         case BINDER_THREAD_EXIT:
2736                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2737                              proc->pid, thread->pid);
2738                 binder_free_thread(proc, thread);
2739                 thread = NULL;
2740                 break;
2741         case BINDER_VERSION: {
2742                 struct binder_version __user *ver = ubuf;
2743
2744                 if (size != sizeof(struct binder_version)) {
2745                         ret = -EINVAL;
2746                         goto err;
2747                 }
2748                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2749                              &ver->protocol_version)) {
2750                         ret = -EINVAL;
2751                         goto err;
2752                 }
2753                 break;
2754         }
2755         default:
2756                 ret = -EINVAL;
2757                 goto err;
2758         }
2759         ret = 0;
2760 err:
2761         if (thread)
2762                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2763         binder_unlock(__func__);
2764         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2765         if (ret && ret != -ERESTARTSYS)
2766                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2767 err_unlocked:
2768         trace_binder_ioctl_done(ret);
2769         return ret;
2770 }
2771
2772 static void binder_vma_open(struct vm_area_struct *vma)
2773 {
2774         struct binder_proc *proc = vma->vm_private_data;
2775
2776         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2777                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2778                      proc->pid, vma->vm_start, vma->vm_end,
2779                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2780                      (unsigned long)pgprot_val(vma->vm_page_prot));
2781 }
2782
2783 static void binder_vma_close(struct vm_area_struct *vma)
2784 {
2785         struct binder_proc *proc = vma->vm_private_data;
2786
2787         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2788                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2789                      proc->pid, vma->vm_start, vma->vm_end,
2790                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2791                      (unsigned long)pgprot_val(vma->vm_page_prot));
2792         proc->vma = NULL;
2793         proc->vma_vm_mm = NULL;
2794         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2795 }
2796
2797 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2798 {
2799         return VM_FAULT_SIGBUS;
2800 }
2801
2802 static struct vm_operations_struct binder_vm_ops = {
2803         .open = binder_vma_open,
2804         .close = binder_vma_close,
2805         .fault = binder_vm_fault,
2806 };
2807
2808 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2809 {
2810         int ret;
2811         struct vm_struct *area;
2812         struct binder_proc *proc = filp->private_data;
2813         const char *failure_string;
2814         struct binder_buffer *buffer;
2815
2816         if (proc->tsk != current)
2817                 return -EINVAL;
2818
2819         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2820                 vma->vm_end = vma->vm_start + SZ_4M;
2821
2822         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2823                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2824                      proc->pid, vma->vm_start, vma->vm_end,
2825                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2826                      (unsigned long)pgprot_val(vma->vm_page_prot));
2827
2828         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2829                 ret = -EPERM;
2830                 failure_string = "bad vm_flags";
2831                 goto err_bad_arg;
2832         }
2833         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2834
2835         mutex_lock(&binder_mmap_lock);
2836         if (proc->buffer) {
2837                 ret = -EBUSY;
2838                 failure_string = "already mapped";
2839                 goto err_already_mapped;
2840         }
2841
2842         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2843         if (area == NULL) {
2844                 ret = -ENOMEM;
2845                 failure_string = "get_vm_area";
2846                 goto err_get_vm_area_failed;
2847         }
2848         proc->buffer = area->addr;
2849         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2850         mutex_unlock(&binder_mmap_lock);
2851
2852 #ifdef CONFIG_CPU_CACHE_VIPT
2853         if (cache_is_vipt_aliasing()) {
2854                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2855                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2856                         vma->vm_start += PAGE_SIZE;
2857                 }
2858         }
2859 #endif
2860         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2861         if (proc->pages == NULL) {
2862                 ret = -ENOMEM;
2863                 failure_string = "alloc page array";
2864                 goto err_alloc_pages_failed;
2865         }
2866         proc->buffer_size = vma->vm_end - vma->vm_start;
2867
2868         vma->vm_ops = &binder_vm_ops;
2869         vma->vm_private_data = proc;
2870
2871         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2872                 ret = -ENOMEM;
2873                 failure_string = "alloc small buf";
2874                 goto err_alloc_small_buf_failed;
2875         }
2876         buffer = proc->buffer;
2877         INIT_LIST_HEAD(&proc->buffers);
2878         list_add(&buffer->entry, &proc->buffers);
2879         buffer->free = 1;
2880         binder_insert_free_buffer(proc, buffer);
2881         proc->free_async_space = proc->buffer_size / 2;
2882         barrier();
2883         proc->files = get_files_struct(current);
2884         proc->vma = vma;
2885         proc->vma_vm_mm = vma->vm_mm;
2886
2887         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2888                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2889         return 0;
2890
2891 err_alloc_small_buf_failed:
2892         kfree(proc->pages);
2893         proc->pages = NULL;
2894 err_alloc_pages_failed:
2895         mutex_lock(&binder_mmap_lock);
2896         vfree(proc->buffer);
2897         proc->buffer = NULL;
2898 err_get_vm_area_failed:
2899 err_already_mapped:
2900         mutex_unlock(&binder_mmap_lock);
2901 err_bad_arg:
2902         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2903                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2904         return ret;
2905 }
2906
2907 static int binder_open(struct inode *nodp, struct file *filp)
2908 {
2909         struct binder_proc *proc;
2910
2911         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2912                      current->group_leader->pid, current->pid);
2913
2914         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2915         if (proc == NULL)
2916                 return -ENOMEM;
2917         get_task_struct(current);
2918         proc->tsk = current;
2919         INIT_LIST_HEAD(&proc->todo);
2920         init_waitqueue_head(&proc->wait);
2921         proc->default_priority = task_nice(current);
2922
2923         binder_lock(__func__);
2924
2925         binder_stats_created(BINDER_STAT_PROC);
2926         hlist_add_head(&proc->proc_node, &binder_procs);
2927         proc->pid = current->group_leader->pid;
2928         INIT_LIST_HEAD(&proc->delivered_death);
2929         filp->private_data = proc;
2930
2931         binder_unlock(__func__);
2932
2933         if (binder_debugfs_dir_entry_proc) {
2934                 char strbuf[11];
2935
2936                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2937                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2938                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2939         }
2940
2941         return 0;
2942 }
2943
2944 static int binder_flush(struct file *filp, fl_owner_t id)
2945 {
2946         struct binder_proc *proc = filp->private_data;
2947
2948         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2949
2950         return 0;
2951 }
2952
2953 static void binder_deferred_flush(struct binder_proc *proc)
2954 {
2955         struct rb_node *n;
2956         int wake_count = 0;
2957
2958         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2959                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2960
2961                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2962                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2963                         wake_up_interruptible(&thread->wait);
2964                         wake_count++;
2965                 }
2966         }
2967         wake_up_interruptible_all(&proc->wait);
2968
2969         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2970                      "binder_flush: %d woke %d threads\n", proc->pid,
2971                      wake_count);
2972 }
2973
2974 static int binder_release(struct inode *nodp, struct file *filp)
2975 {
2976         struct binder_proc *proc = filp->private_data;
2977
2978         debugfs_remove(proc->debugfs_entry);
2979         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
2980
2981         return 0;
2982 }
2983
2984 static int binder_node_release(struct binder_node *node, int refs)
2985 {
2986         struct binder_ref *ref;
2987         int death = 0;
2988
2989         list_del_init(&node->work.entry);
2990         binder_release_work(&node->async_todo);
2991
2992         if (hlist_empty(&node->refs)) {
2993                 kfree(node);
2994                 binder_stats_deleted(BINDER_STAT_NODE);
2995
2996                 return refs;
2997         }
2998
2999         node->proc = NULL;
3000         node->local_strong_refs = 0;
3001         node->local_weak_refs = 0;
3002         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3003
3004         hlist_for_each_entry(ref, &node->refs, node_entry) {
3005                 refs++;
3006
3007                 if (!ref->death)
3008                         continue;
3009
3010                 death++;
3011
3012                 if (list_empty(&ref->death->work.entry)) {
3013                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3014                         list_add_tail(&ref->death->work.entry,
3015                                       &ref->proc->todo);
3016                         wake_up_interruptible(&ref->proc->wait);
3017                 } else
3018                         BUG();
3019         }
3020
3021         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3022                      "node %d now dead, refs %d, death %d\n",
3023                      node->debug_id, refs, death);
3024
3025         return refs;
3026 }
3027
3028 static void binder_deferred_release(struct binder_proc *proc)
3029 {
3030         struct binder_transaction *t;
3031         struct rb_node *n;
3032         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3033                 active_transactions, page_count;
3034
3035         BUG_ON(proc->vma);
3036         BUG_ON(proc->files);
3037
3038         hlist_del(&proc->proc_node);
3039
3040         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3041                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3042                              "%s: %d context_mgr_node gone\n",
3043                              __func__, proc->pid);
3044                 binder_context_mgr_node = NULL;
3045         }
3046
3047         threads = 0;
3048         active_transactions = 0;
3049         while ((n = rb_first(&proc->threads))) {
3050                 struct binder_thread *thread;
3051
3052                 thread = rb_entry(n, struct binder_thread, rb_node);
3053                 threads++;
3054                 active_transactions += binder_free_thread(proc, thread);
3055         }
3056
3057         nodes = 0;
3058         incoming_refs = 0;
3059         while ((n = rb_first(&proc->nodes))) {
3060                 struct binder_node *node;
3061
3062                 node = rb_entry(n, struct binder_node, rb_node);
3063                 nodes++;
3064                 rb_erase(&node->rb_node, &proc->nodes);
3065                 incoming_refs = binder_node_release(node, incoming_refs);
3066         }
3067
3068         outgoing_refs = 0;
3069         while ((n = rb_first(&proc->refs_by_desc))) {
3070                 struct binder_ref *ref;
3071
3072                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3073                 outgoing_refs++;
3074                 binder_delete_ref(ref);
3075         }
3076
3077         binder_release_work(&proc->todo);
3078         binder_release_work(&proc->delivered_death);
3079
3080         buffers = 0;
3081         while ((n = rb_first(&proc->allocated_buffers))) {
3082                 struct binder_buffer *buffer;
3083
3084                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3085
3086                 t = buffer->transaction;
3087                 if (t) {
3088                         t->buffer = NULL;
3089                         buffer->transaction = NULL;
3090                         pr_err("release proc %d, transaction %d, not freed\n",
3091                                proc->pid, t->debug_id);
3092                         /*BUG();*/
3093                 }
3094
3095                 binder_free_buf(proc, buffer);
3096                 buffers++;
3097         }
3098
3099         binder_stats_deleted(BINDER_STAT_PROC);
3100
3101         page_count = 0;
3102         if (proc->pages) {
3103                 int i;
3104
3105                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3106                         void *page_addr;
3107
3108                         if (!proc->pages[i])
3109                                 continue;
3110
3111                         page_addr = proc->buffer + i * PAGE_SIZE;
3112                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3113                                      "%s: %d: page %d at %p not freed\n",
3114                                      __func__, proc->pid, i, page_addr);
3115                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3116                         __free_page(proc->pages[i]);
3117                         page_count++;
3118                 }
3119                 kfree(proc->pages);
3120                 vfree(proc->buffer);
3121         }
3122
3123         put_task_struct(proc->tsk);
3124
3125         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3126                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3127                      __func__, proc->pid, threads, nodes, incoming_refs,
3128                      outgoing_refs, active_transactions, buffers, page_count);
3129
3130         kfree(proc);
3131 }
3132
3133 static void binder_deferred_func(struct work_struct *work)
3134 {
3135         struct binder_proc *proc;
3136         struct files_struct *files;
3137
3138         int defer;
3139
3140         do {
3141                 binder_lock(__func__);
3142                 mutex_lock(&binder_deferred_lock);
3143                 if (!hlist_empty(&binder_deferred_list)) {
3144                         proc = hlist_entry(binder_deferred_list.first,
3145                                         struct binder_proc, deferred_work_node);
3146                         hlist_del_init(&proc->deferred_work_node);
3147                         defer = proc->deferred_work;
3148                         proc->deferred_work = 0;
3149                 } else {
3150                         proc = NULL;
3151                         defer = 0;
3152                 }
3153                 mutex_unlock(&binder_deferred_lock);
3154
3155                 files = NULL;
3156                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3157                         files = proc->files;
3158                         if (files)
3159                                 proc->files = NULL;
3160                 }
3161
3162                 if (defer & BINDER_DEFERRED_FLUSH)
3163                         binder_deferred_flush(proc);
3164
3165                 if (defer & BINDER_DEFERRED_RELEASE)
3166                         binder_deferred_release(proc); /* frees proc */
3167
3168                 binder_unlock(__func__);
3169                 if (files)
3170                         put_files_struct(files);
3171         } while (proc);
3172 }
3173 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3174
3175 static void
3176 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3177 {
3178         mutex_lock(&binder_deferred_lock);
3179         proc->deferred_work |= defer;
3180         if (hlist_unhashed(&proc->deferred_work_node)) {
3181                 hlist_add_head(&proc->deferred_work_node,
3182                                 &binder_deferred_list);
3183                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3184         }
3185         mutex_unlock(&binder_deferred_lock);
3186 }
3187
3188 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3189                                      struct binder_transaction *t)
3190 {
3191         seq_printf(m,
3192                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3193                    prefix, t->debug_id, t,
3194                    t->from ? t->from->proc->pid : 0,
3195                    t->from ? t->from->pid : 0,
3196                    t->to_proc ? t->to_proc->pid : 0,
3197                    t->to_thread ? t->to_thread->pid : 0,
3198                    t->code, t->flags, t->priority, t->need_reply);
3199         if (t->buffer == NULL) {
3200                 seq_puts(m, " buffer free\n");
3201                 return;
3202         }
3203         if (t->buffer->target_node)
3204                 seq_printf(m, " node %d",
3205                            t->buffer->target_node->debug_id);
3206         seq_printf(m, " size %zd:%zd data %p\n",
3207                    t->buffer->data_size, t->buffer->offsets_size,
3208                    t->buffer->data);
3209 }
3210
3211 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3212                                 struct binder_buffer *buffer)
3213 {
3214         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3215                    prefix, buffer->debug_id, buffer->data,
3216                    buffer->data_size, buffer->offsets_size,
3217                    buffer->transaction ? "active" : "delivered");
3218 }
3219
3220 static void print_binder_work(struct seq_file *m, const char *prefix,
3221                               const char *transaction_prefix,
3222                               struct binder_work *w)
3223 {
3224         struct binder_node *node;
3225         struct binder_transaction *t;
3226
3227         switch (w->type) {
3228         case BINDER_WORK_TRANSACTION:
3229                 t = container_of(w, struct binder_transaction, work);
3230                 print_binder_transaction(m, transaction_prefix, t);
3231                 break;
3232         case BINDER_WORK_TRANSACTION_COMPLETE:
3233                 seq_printf(m, "%stransaction complete\n", prefix);
3234                 break;
3235         case BINDER_WORK_NODE:
3236                 node = container_of(w, struct binder_node, work);
3237                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3238                            prefix, node->debug_id,
3239                            (u64)node->ptr, (u64)node->cookie);
3240                 break;
3241         case BINDER_WORK_DEAD_BINDER:
3242                 seq_printf(m, "%shas dead binder\n", prefix);
3243                 break;
3244         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3245                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3246                 break;
3247         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3248                 seq_printf(m, "%shas cleared death notification\n", prefix);
3249                 break;
3250         default:
3251                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3252                 break;
3253         }
3254 }
3255
3256 static void print_binder_thread(struct seq_file *m,
3257                                 struct binder_thread *thread,
3258                                 int print_always)
3259 {
3260         struct binder_transaction *t;
3261         struct binder_work *w;
3262         size_t start_pos = m->count;
3263         size_t header_pos;
3264
3265         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3266         header_pos = m->count;
3267         t = thread->transaction_stack;
3268         while (t) {
3269                 if (t->from == thread) {
3270                         print_binder_transaction(m,
3271                                                  "    outgoing transaction", t);
3272                         t = t->from_parent;
3273                 } else if (t->to_thread == thread) {
3274                         print_binder_transaction(m,
3275                                                  "    incoming transaction", t);
3276                         t = t->to_parent;
3277                 } else {
3278                         print_binder_transaction(m, "    bad transaction", t);
3279                         t = NULL;
3280                 }
3281         }
3282         list_for_each_entry(w, &thread->todo, entry) {
3283                 print_binder_work(m, "    ", "    pending transaction", w);
3284         }
3285         if (!print_always && m->count == header_pos)
3286                 m->count = start_pos;
3287 }
3288
3289 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3290 {
3291         struct binder_ref *ref;
3292         struct binder_work *w;
3293         int count;
3294
3295         count = 0;
3296         hlist_for_each_entry(ref, &node->refs, node_entry)
3297                 count++;
3298
3299         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3300                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3301                    node->has_strong_ref, node->has_weak_ref,
3302                    node->local_strong_refs, node->local_weak_refs,
3303                    node->internal_strong_refs, count);
3304         if (count) {
3305                 seq_puts(m, " proc");
3306                 hlist_for_each_entry(ref, &node->refs, node_entry)
3307                         seq_printf(m, " %d", ref->proc->pid);
3308         }
3309         seq_puts(m, "\n");
3310         list_for_each_entry(w, &node->async_todo, entry)
3311                 print_binder_work(m, "    ",
3312                                   "    pending async transaction", w);
3313 }
3314
3315 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3316 {
3317         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3318                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3319                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3320 }
3321
3322 static void print_binder_proc(struct seq_file *m,
3323                               struct binder_proc *proc, int print_all)
3324 {
3325         struct binder_work *w;
3326         struct rb_node *n;
3327         size_t start_pos = m->count;
3328         size_t header_pos;
3329
3330         seq_printf(m, "proc %d\n", proc->pid);
3331         header_pos = m->count;
3332
3333         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3334                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3335                                                 rb_node), print_all);
3336         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3337                 struct binder_node *node = rb_entry(n, struct binder_node,
3338                                                     rb_node);
3339                 if (print_all || node->has_async_transaction)
3340                         print_binder_node(m, node);
3341         }
3342         if (print_all) {
3343                 for (n = rb_first(&proc->refs_by_desc);
3344                      n != NULL;
3345                      n = rb_next(n))
3346                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3347                                                      rb_node_desc));
3348         }
3349         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3350                 print_binder_buffer(m, "  buffer",
3351                                     rb_entry(n, struct binder_buffer, rb_node));
3352         list_for_each_entry(w, &proc->todo, entry)
3353                 print_binder_work(m, "  ", "  pending transaction", w);
3354         list_for_each_entry(w, &proc->delivered_death, entry) {
3355                 seq_puts(m, "  has delivered dead binder\n");
3356                 break;
3357         }
3358         if (!print_all && m->count == header_pos)
3359                 m->count = start_pos;
3360 }
3361
3362 static const char * const binder_return_strings[] = {
3363         "BR_ERROR",
3364         "BR_OK",
3365         "BR_TRANSACTION",
3366         "BR_REPLY",
3367         "BR_ACQUIRE_RESULT",
3368         "BR_DEAD_REPLY",
3369         "BR_TRANSACTION_COMPLETE",
3370         "BR_INCREFS",
3371         "BR_ACQUIRE",
3372         "BR_RELEASE",
3373         "BR_DECREFS",
3374         "BR_ATTEMPT_ACQUIRE",
3375         "BR_NOOP",
3376         "BR_SPAWN_LOOPER",
3377         "BR_FINISHED",
3378         "BR_DEAD_BINDER",
3379         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3380         "BR_FAILED_REPLY"
3381 };
3382
3383 static const char * const binder_command_strings[] = {
3384         "BC_TRANSACTION",
3385         "BC_REPLY",
3386         "BC_ACQUIRE_RESULT",
3387         "BC_FREE_BUFFER",
3388         "BC_INCREFS",
3389         "BC_ACQUIRE",
3390         "BC_RELEASE",
3391         "BC_DECREFS",
3392         "BC_INCREFS_DONE",
3393         "BC_ACQUIRE_DONE",
3394         "BC_ATTEMPT_ACQUIRE",
3395         "BC_REGISTER_LOOPER",
3396         "BC_ENTER_LOOPER",
3397         "BC_EXIT_LOOPER",
3398         "BC_REQUEST_DEATH_NOTIFICATION",
3399         "BC_CLEAR_DEATH_NOTIFICATION",
3400         "BC_DEAD_BINDER_DONE"
3401 };
3402
3403 static const char * const binder_objstat_strings[] = {
3404         "proc",
3405         "thread",
3406         "node",
3407         "ref",
3408         "death",
3409         "transaction",
3410         "transaction_complete"
3411 };
3412
3413 static void print_binder_stats(struct seq_file *m, const char *prefix,
3414                                struct binder_stats *stats)
3415 {
3416         int i;
3417
3418         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3419                      ARRAY_SIZE(binder_command_strings));
3420         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3421                 if (stats->bc[i])
3422                         seq_printf(m, "%s%s: %d\n", prefix,
3423                                    binder_command_strings[i], stats->bc[i]);
3424         }
3425
3426         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3427                      ARRAY_SIZE(binder_return_strings));
3428         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3429                 if (stats->br[i])
3430                         seq_printf(m, "%s%s: %d\n", prefix,
3431                                    binder_return_strings[i], stats->br[i]);
3432         }
3433
3434         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3435                      ARRAY_SIZE(binder_objstat_strings));
3436         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3437                      ARRAY_SIZE(stats->obj_deleted));
3438         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3439                 if (stats->obj_created[i] || stats->obj_deleted[i])
3440                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3441                                 binder_objstat_strings[i],
3442                                 stats->obj_created[i] - stats->obj_deleted[i],
3443                                 stats->obj_created[i]);
3444         }
3445 }
3446
3447 static void print_binder_proc_stats(struct seq_file *m,
3448                                     struct binder_proc *proc)
3449 {
3450         struct binder_work *w;
3451         struct rb_node *n;
3452         int count, strong, weak;
3453
3454         seq_printf(m, "proc %d\n", proc->pid);
3455         count = 0;
3456         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3457                 count++;
3458         seq_printf(m, "  threads: %d\n", count);
3459         seq_printf(m, "  requested threads: %d+%d/%d\n"
3460                         "  ready threads %d\n"
3461                         "  free async space %zd\n", proc->requested_threads,
3462                         proc->requested_threads_started, proc->max_threads,
3463                         proc->ready_threads, proc->free_async_space);
3464         count = 0;
3465         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3466                 count++;
3467         seq_printf(m, "  nodes: %d\n", count);
3468         count = 0;
3469         strong = 0;
3470         weak = 0;
3471         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3472                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3473                                                   rb_node_desc);
3474                 count++;
3475                 strong += ref->strong;
3476                 weak += ref->weak;
3477         }
3478         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3479
3480         count = 0;
3481         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3482                 count++;
3483         seq_printf(m, "  buffers: %d\n", count);
3484
3485         count = 0;
3486         list_for_each_entry(w, &proc->todo, entry) {
3487                 switch (w->type) {
3488                 case BINDER_WORK_TRANSACTION:
3489                         count++;
3490                         break;
3491                 default:
3492                         break;
3493                 }
3494         }
3495         seq_printf(m, "  pending transactions: %d\n", count);
3496
3497         print_binder_stats(m, "  ", &proc->stats);
3498 }
3499
3500
3501 static int binder_state_show(struct seq_file *m, void *unused)
3502 {
3503         struct binder_proc *proc;
3504         struct binder_node *node;
3505         int do_lock = !binder_debug_no_lock;
3506
3507         if (do_lock)
3508                 binder_lock(__func__);
3509
3510         seq_puts(m, "binder state:\n");
3511
3512         if (!hlist_empty(&binder_dead_nodes))
3513                 seq_puts(m, "dead nodes:\n");
3514         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3515                 print_binder_node(m, node);
3516
3517         hlist_for_each_entry(proc, &binder_procs, proc_node)
3518                 print_binder_proc(m, proc, 1);
3519         if (do_lock)
3520                 binder_unlock(__func__);
3521         return 0;
3522 }
3523
3524 static int binder_stats_show(struct seq_file *m, void *unused)
3525 {
3526         struct binder_proc *proc;
3527         int do_lock = !binder_debug_no_lock;
3528
3529         if (do_lock)
3530                 binder_lock(__func__);
3531
3532         seq_puts(m, "binder stats:\n");
3533
3534         print_binder_stats(m, "", &binder_stats);
3535
3536         hlist_for_each_entry(proc, &binder_procs, proc_node)
3537                 print_binder_proc_stats(m, proc);
3538         if (do_lock)
3539                 binder_unlock(__func__);
3540         return 0;
3541 }
3542
3543 static int binder_transactions_show(struct seq_file *m, void *unused)
3544 {
3545         struct binder_proc *proc;
3546         int do_lock = !binder_debug_no_lock;
3547
3548         if (do_lock)
3549                 binder_lock(__func__);
3550
3551         seq_puts(m, "binder transactions:\n");
3552         hlist_for_each_entry(proc, &binder_procs, proc_node)
3553                 print_binder_proc(m, proc, 0);
3554         if (do_lock)
3555                 binder_unlock(__func__);
3556         return 0;
3557 }
3558
3559 static int binder_proc_show(struct seq_file *m, void *unused)
3560 {
3561         struct binder_proc *proc = m->private;
3562         int do_lock = !binder_debug_no_lock;
3563
3564         if (do_lock)
3565                 binder_lock(__func__);
3566         seq_puts(m, "binder proc state:\n");
3567         print_binder_proc(m, proc, 1);
3568         if (do_lock)
3569                 binder_unlock(__func__);
3570         return 0;
3571 }
3572
3573 static void print_binder_transaction_log_entry(struct seq_file *m,
3574                                         struct binder_transaction_log_entry *e)
3575 {
3576         seq_printf(m,
3577                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3578                    e->debug_id, (e->call_type == 2) ? "reply" :
3579                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3580                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3581                    e->target_handle, e->data_size, e->offsets_size);
3582 }
3583
3584 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3585 {
3586         struct binder_transaction_log *log = m->private;
3587         int i;
3588
3589         if (log->full) {
3590                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3591                         print_binder_transaction_log_entry(m, &log->entry[i]);
3592         }
3593         for (i = 0; i < log->next; i++)
3594                 print_binder_transaction_log_entry(m, &log->entry[i]);
3595         return 0;
3596 }
3597
3598 static const struct file_operations binder_fops = {
3599         .owner = THIS_MODULE,
3600         .poll = binder_poll,
3601         .unlocked_ioctl = binder_ioctl,
3602         .compat_ioctl = binder_ioctl,
3603         .mmap = binder_mmap,
3604         .open = binder_open,
3605         .flush = binder_flush,
3606         .release = binder_release,
3607 };
3608
3609 static struct miscdevice binder_miscdev = {
3610         .minor = MISC_DYNAMIC_MINOR,
3611         .name = "binder",
3612         .fops = &binder_fops
3613 };
3614
3615 BINDER_DEBUG_ENTRY(state);
3616 BINDER_DEBUG_ENTRY(stats);
3617 BINDER_DEBUG_ENTRY(transactions);
3618 BINDER_DEBUG_ENTRY(transaction_log);
3619
3620 static int __init binder_init(void)
3621 {
3622         int ret;
3623
3624         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3625         if (!binder_deferred_workqueue)
3626                 return -ENOMEM;
3627
3628         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3629         if (binder_debugfs_dir_entry_root)
3630                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3631                                                  binder_debugfs_dir_entry_root);
3632         ret = misc_register(&binder_miscdev);
3633         if (binder_debugfs_dir_entry_root) {
3634                 debugfs_create_file("state",
3635                                     S_IRUGO,
3636                                     binder_debugfs_dir_entry_root,
3637                                     NULL,
3638                                     &binder_state_fops);
3639                 debugfs_create_file("stats",
3640                                     S_IRUGO,
3641                                     binder_debugfs_dir_entry_root,
3642                                     NULL,
3643                                     &binder_stats_fops);
3644                 debugfs_create_file("transactions",
3645                                     S_IRUGO,
3646                                     binder_debugfs_dir_entry_root,
3647                                     NULL,
3648                                     &binder_transactions_fops);
3649                 debugfs_create_file("transaction_log",
3650                                     S_IRUGO,
3651                                     binder_debugfs_dir_entry_root,
3652                                     &binder_transaction_log,
3653                                     &binder_transaction_log_fops);
3654                 debugfs_create_file("failed_transaction_log",
3655                                     S_IRUGO,
3656                                     binder_debugfs_dir_entry_root,
3657                                     &binder_transaction_log_failed,
3658                                     &binder_transaction_log_fops);
3659         }
3660         return ret;
3661 }
3662
3663 device_initcall(binder_init);
3664
3665 #define CREATE_TRACE_POINTS
3666 #include "binder_trace.h"
3667
3668 MODULE_LICENSE("GPL v2");