drivers/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <asm/cacheflush.h>
  21 #include <linux/fdtable.h>
  22 #include <linux/file.h>
  23 #include <linux/freezer.h>
  24 #include <linux/fs.h>
  25 #include <linux/list.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/nsproxy.h>
  31 #include <linux/poll.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/rbtree.h>
  34 #include <linux/sched.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/pid_namespace.h>
  40 #include <linux/security.h>
  41
  42 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  43 #define BINDER_IPC_32BIT 1
  44 #endif
  45
  46 #include <uapi/linux/android/binder.h>
  47 #include "binder_trace.h"
  48
  49 static DEFINE_MUTEX(binder_main_lock);
  50 static DEFINE_MUTEX(binder_deferred_lock);
  51 static DEFINE_MUTEX(binder_mmap_lock);
  52
  53 static HLIST_HEAD(binder_procs);
  54 static HLIST_HEAD(binder_deferred_list);
  55 static HLIST_HEAD(binder_dead_nodes);
  56
  57 static struct dentry *binder_debugfs_dir_entry_root;
  58 static struct dentry *binder_debugfs_dir_entry_proc;
  59 static struct binder_node *binder_context_mgr_node;
  60 static kuid_t binder_context_mgr_uid = INVALID_UID;
  61 static int binder_last_id;
  62 static struct workqueue_struct *binder_deferred_workqueue;
  63
  64 #define BINDER_DEBUG_ENTRY(name) \
  65 static int binder_##name##_open(struct inode *inode, struct file *file) \
  66 { \
  67         return single_open(file, binder_##name##_show, inode->i_private); \
  68 } \
  69 \
  70 static const struct file_operations binder_##name##_fops = { \
  71         .owner = THIS_MODULE, \
  72         .open = binder_##name##_open, \
  73         .read = seq_read, \
  74         .llseek = seq_lseek, \
  75         .release = single_release, \
  76 }
  77
  78 static int binder_proc_show(struct seq_file *m, void *unused);
  79 BINDER_DEBUG_ENTRY(proc);
  80
  81 /* This is only defined in include/asm-arm/sizes.h */
  82 #ifndef SZ_1K
  83 #define SZ_1K                               0x400
  84 #endif
  85
  86 #ifndef SZ_4M
  87 #define SZ_4M                               0x400000
  88 #endif
  89
  90 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  91
  92 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  93
  94 enum {
  95         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  96         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  97         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  98         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  99         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
 100         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 101         BINDER_DEBUG_READ_WRITE             = 1U << 6,
 102         BINDER_DEBUG_USER_REFS              = 1U << 7,
 103         BINDER_DEBUG_THREADS                = 1U << 8,
 104         BINDER_DEBUG_TRANSACTION            = 1U << 9,
 105         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 106         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 107         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 108         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 109         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 110         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 111 };
 112 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 113         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 114 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 115
 116 static bool binder_debug_no_lock;
 117 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 118
 119 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 120 static int binder_stop_on_user_error;
 121
 122 static int binder_set_stop_on_user_error(const char *val,
 123                                          struct kernel_param *kp)
 124 {
 125         int ret;
 126
 127         ret = param_set_int(val, kp);
 128         if (binder_stop_on_user_error < 2)
 129                 wake_up(&binder_user_error_wait);
 130         return ret;
 131 }
 132 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 133         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 134
 135 #define binder_debug(mask, x...) \
 136         do { \
 137                 if (binder_debug_mask & mask) \
 138                         pr_info(x); \
 139         } while (0)
 140
 141 #define binder_user_error(x...) \
 142         do { \
 143                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 144                         pr_info(x); \
 145                 if (binder_stop_on_user_error) \
 146                         binder_stop_on_user_error = 2; \
 147         } while (0)
 148
 149 enum binder_stat_types {
 150         BINDER_STAT_PROC,
 151         BINDER_STAT_THREAD,
 152         BINDER_STAT_NODE,
 153         BINDER_STAT_REF,
 154         BINDER_STAT_DEATH,
 155         BINDER_STAT_TRANSACTION,
 156         BINDER_STAT_TRANSACTION_COMPLETE,
 157         BINDER_STAT_COUNT
 158 };
 159
 160 struct binder_stats {
 161         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 162         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 163         int obj_created[BINDER_STAT_COUNT];
 164         int obj_deleted[BINDER_STAT_COUNT];
 165 };
 166
 167 static struct binder_stats binder_stats;
 168
 169 static inline void binder_stats_deleted(enum binder_stat_types type)
 170 {
 171         binder_stats.obj_deleted[type]++;
 172 }
 173
 174 static inline void binder_stats_created(enum binder_stat_types type)
 175 {
 176         binder_stats.obj_created[type]++;
 177 }
 178
 179 struct binder_transaction_log_entry {
 180         int debug_id;
 181         int call_type;
 182         int from_proc;
 183         int from_thread;
 184         int target_handle;
 185         int to_proc;
 186         int to_thread;
 187         int to_node;
 188         int data_size;
 189         int offsets_size;
 190 };
 191 struct binder_transaction_log {
 192         int next;
 193         int full;
 194         struct binder_transaction_log_entry entry[32];
 195 };
 196 static struct binder_transaction_log binder_transaction_log;
 197 static struct binder_transaction_log binder_transaction_log_failed;
 198
 199 static struct binder_transaction_log_entry *binder_transaction_log_add(
 200         struct binder_transaction_log *log)
 201 {
 202         struct binder_transaction_log_entry *e;
 203
 204         e = &log->entry[log->next];
 205         memset(e, 0, sizeof(*e));
 206         log->next++;
 207         if (log->next == ARRAY_SIZE(log->entry)) {
 208                 log->next = 0;
 209                 log->full = 1;
 210         }
 211         return e;
 212 }
 213
 214 struct binder_work {
 215         struct list_head entry;
 216         enum {
 217                 BINDER_WORK_TRANSACTION = 1,
 218                 BINDER_WORK_TRANSACTION_COMPLETE,
 219                 BINDER_WORK_NODE,
 220                 BINDER_WORK_DEAD_BINDER,
 221                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 222                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 223         } type;
 224 };
 225
 226 struct binder_node {
 227         int debug_id;
 228         struct binder_work work;
 229         union {
 230                 struct rb_node rb_node;
 231                 struct hlist_node dead_node;
 232         };
 233         struct binder_proc *proc;
 234         struct hlist_head refs;
 235         int internal_strong_refs;
 236         int local_weak_refs;
 237         int local_strong_refs;
 238         binder_uintptr_t ptr;
 239         binder_uintptr_t cookie;
 240         unsigned has_strong_ref:1;
 241         unsigned pending_strong_ref:1;
 242         unsigned has_weak_ref:1;
 243         unsigned pending_weak_ref:1;
 244         unsigned has_async_transaction:1;
 245         unsigned accept_fds:1;
 246         unsigned min_priority:8;
 247         struct list_head async_todo;
 248 };
 249
 250 struct binder_ref_death {
 251         struct binder_work work;
 252         binder_uintptr_t cookie;
 253 };
 254
 255 struct binder_ref {
 256         /* Lookups needed: */
 257         /*   node + proc => ref (transaction) */
 258         /*   desc + proc => ref (transaction, inc/dec ref) */
 259         /*   node => refs + procs (proc exit) */
 260         int debug_id;
 261         struct rb_node rb_node_desc;
 262         struct rb_node rb_node_node;
 263         struct hlist_node node_entry;
 264         struct binder_proc *proc;
 265         struct binder_node *node;
 266         uint32_t desc;
 267         int strong;
 268         int weak;
 269         struct binder_ref_death *death;
 270 };
 271
 272 struct binder_buffer {
 273         struct list_head entry; /* free and allocated entries by address */
 274         struct rb_node rb_node; /* free entry by size or allocated entry */
 275                                 /* by address */
 276         unsigned free:1;
 277         unsigned allow_user_free:1;
 278         unsigned async_transaction:1;
 279         unsigned debug_id:29;
 280
 281         struct binder_transaction *transaction;
 282
 283         struct binder_node *target_node;
 284         size_t data_size;
 285         size_t offsets_size;
 286         uint8_t data[0];
 287 };
 288
 289 enum binder_deferred_state {
 290         BINDER_DEFERRED_PUT_FILES    = 0x01,
 291         BINDER_DEFERRED_FLUSH        = 0x02,
 292         BINDER_DEFERRED_RELEASE      = 0x04,
 293 };
 294
 295 struct binder_proc {
 296         struct hlist_node proc_node;
 297         struct rb_root threads;
 298         struct rb_root nodes;
 299         struct rb_root refs_by_desc;
 300         struct rb_root refs_by_node;
 301         int pid;
 302         struct vm_area_struct *vma;
 303         struct mm_struct *vma_vm_mm;
 304         struct task_struct *tsk;
 305         struct files_struct *files;
 306         const struct cred *cred;
 307         struct hlist_node deferred_work_node;
 308         int deferred_work;
 309         void *buffer;
 310         ptrdiff_t user_buffer_offset;
 311
 312         struct list_head buffers;
 313         struct rb_root free_buffers;
 314         struct rb_root allocated_buffers;
 315         size_t free_async_space;
 316
 317         struct page **pages;
 318         size_t buffer_size;
 319         uint32_t buffer_free;
 320         struct list_head todo;
 321         wait_queue_head_t wait;
 322         struct binder_stats stats;
 323         struct list_head delivered_death;
 324         int max_threads;
 325         int requested_threads;
 326         int requested_threads_started;
 327         int ready_threads;
 328         long default_priority;
 329         struct dentry *debugfs_entry;
 330 };
 331
 332 enum {
 333         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 334         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 335         BINDER_LOOPER_STATE_EXITED      = 0x04,
 336         BINDER_LOOPER_STATE_INVALID     = 0x08,
 337         BINDER_LOOPER_STATE_WAITING     = 0x10,
 338         BINDER_LOOPER_STATE_NEED_RETURN = 0x20,
 339         BINDER_LOOPER_STATE_POLL        = 0x40,
 340 };
 341
 342 struct binder_thread {
 343         struct binder_proc *proc;
 344         struct rb_node rb_node;
 345         int pid;
 346         int looper;
 347         struct binder_transaction *transaction_stack;
 348         struct list_head todo;
 349         uint32_t return_error; /* Write failed, return error code in read buf */
 350         uint32_t return_error2; /* Write failed, return error code in read */
 351                 /* buffer. Used when sending a reply to a dead process that */
 352                 /* we are also waiting on */
 353         wait_queue_head_t wait;
 354         struct binder_stats stats;
 355 };
 356
 357 struct binder_transaction {
 358         int debug_id;
 359         struct binder_work work;
 360         struct binder_thread *from;
 361         struct binder_transaction *from_parent;
 362         struct binder_proc *to_proc;
 363         struct binder_thread *to_thread;
 364         struct binder_transaction *to_parent;
 365         unsigned need_reply:1;
 366         /* unsigned is_dead:1; */       /* not used at the moment */
 367
 368         struct binder_buffer *buffer;
 369         unsigned int    code;
 370         unsigned int    flags;
 371         long    priority;
 372         long    saved_priority;
 373         kuid_t  sender_euid;
 374 };
 375
 376 static void
 377 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 378
 379 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 380 {
 381         struct files_struct *files = proc->files;
 382         unsigned long rlim_cur;
 383         unsigned long irqs;
 384
 385         if (files == NULL)
 386                 return -ESRCH;
 387
 388         if (!lock_task_sighand(proc->tsk, &irqs))
 389                 return -EMFILE;
 390
 391         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 392         unlock_task_sighand(proc->tsk, &irqs);
 393
 394         return __alloc_fd(files, 0, rlim_cur, flags);
 395 }
 396
 397 /*
 398  * copied from fd_install
 399  */
 400 static void task_fd_install(
 401         struct binder_proc *proc, unsigned int fd, struct file *file)
 402 {
 403         if (proc->files)
 404                 __fd_install(proc->files, fd, file);
 405 }
 406
 407 /*
 408  * copied from sys_close
 409  */
 410 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 411 {
 412         int retval;
 413
 414         if (proc->files == NULL)
 415                 return -ESRCH;
 416
 417         retval = __close_fd(proc->files, fd);
 418         /* can't restart close syscall because file table entry was cleared */
 419         if (unlikely(retval == -ERESTARTSYS ||
 420                      retval == -ERESTARTNOINTR ||
 421                      retval == -ERESTARTNOHAND ||
 422                      retval == -ERESTART_RESTARTBLOCK))
 423                 retval = -EINTR;
 424
 425         return retval;
 426 }
 427
 428 static inline void binder_lock(const char *tag)
 429 {
 430         trace_binder_lock(tag);
 431         mutex_lock(&binder_main_lock);
 432         trace_binder_locked(tag);
 433 }
 434
 435 static inline void binder_unlock(const char *tag)
 436 {
 437         trace_binder_unlock(tag);
 438         mutex_unlock(&binder_main_lock);
 439 }
 440
 441 static void binder_set_nice(long nice)
 442 {
 443         long min_nice;
 444
 445         if (can_nice(current, nice)) {
 446                 set_user_nice(current, nice);
 447                 return;
 448         }
 449         min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 450         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 451                      "%d: nice value %ld not allowed use %ld instead\n",
 452                       current->pid, nice, min_nice);
 453         set_user_nice(current, min_nice);
 454         if (min_nice <= MAX_NICE)
 455                 return;
 456         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 457 }
 458
 459 static size_t binder_buffer_size(struct binder_proc *proc,
 460                                  struct binder_buffer *buffer)
 461 {
 462         if (list_is_last(&buffer->entry, &proc->buffers))
 463                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 464         return (size_t)list_entry(buffer->entry.next,
 465                           struct binder_buffer, entry) - (size_t)buffer->data;
 466 }
 467
 468 static void binder_insert_free_buffer(struct binder_proc *proc,
 469                                       struct binder_buffer *new_buffer)
 470 {
 471         struct rb_node **p = &proc->free_buffers.rb_node;
 472         struct rb_node *parent = NULL;
 473         struct binder_buffer *buffer;
 474         size_t buffer_size;
 475         size_t new_buffer_size;
 476
 477         BUG_ON(!new_buffer->free);
 478
 479         new_buffer_size = binder_buffer_size(proc, new_buffer);
 480
 481         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 482                      "%d: add free buffer, size %zd, at %pK\n",
 483                       proc->pid, new_buffer_size, new_buffer);
 484
 485         while (*p) {
 486                 parent = *p;
 487                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 488                 BUG_ON(!buffer->free);
 489
 490                 buffer_size = binder_buffer_size(proc, buffer);
 491
 492                 if (new_buffer_size < buffer_size)
 493                         p = &parent->rb_left;
 494                 else
 495                         p = &parent->rb_right;
 496         }
 497         rb_link_node(&new_buffer->rb_node, parent, p);
 498         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 499 }
 500
 501 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 502                                            struct binder_buffer *new_buffer)
 503 {
 504         struct rb_node **p = &proc->allocated_buffers.rb_node;
 505         struct rb_node *parent = NULL;
 506         struct binder_buffer *buffer;
 507
 508         BUG_ON(new_buffer->free);
 509
 510         while (*p) {
 511                 parent = *p;
 512                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 513                 BUG_ON(buffer->free);
 514
 515                 if (new_buffer < buffer)
 516                         p = &parent->rb_left;
 517                 else if (new_buffer > buffer)
 518                         p = &parent->rb_right;
 519                 else
 520                         BUG();
 521         }
 522         rb_link_node(&new_buffer->rb_node, parent, p);
 523         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 524 }
 525
 526 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 527                                                   uintptr_t user_ptr)
 528 {
 529         struct rb_node *n = proc->allocated_buffers.rb_node;
 530         struct binder_buffer *buffer;
 531         struct binder_buffer *kern_ptr;
 532
 533         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 534                 - offsetof(struct binder_buffer, data));
 535
 536         while (n) {
 537                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 538                 BUG_ON(buffer->free);
 539
 540                 if (kern_ptr < buffer)
 541                         n = n->rb_left;
 542                 else if (kern_ptr > buffer)
 543                         n = n->rb_right;
 544                 else
 545                         return buffer;
 546         }
 547         return NULL;
 548 }
 549
 550 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 551                                     void *start, void *end,
 552                                     struct vm_area_struct *vma)
 553 {
 554         void *page_addr;
 555         unsigned long user_page_addr;
 556         struct page **page;
 557         struct mm_struct *mm;
 558
 559         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 560                      "%d: %s pages %pK-%pK\n", proc->pid,
 561                      allocate ? "allocate" : "free", start, end);
 562
 563         if (end <= start)
 564                 return 0;
 565
 566         trace_binder_update_page_range(proc, allocate, start, end);
 567
 568         if (vma)
 569                 mm = NULL;
 570         else
 571                 mm = get_task_mm(proc->tsk);
 572
 573         if (mm) {
 574                 down_write(&mm->mmap_sem);
 575                 if (!mmget_still_valid(mm)) {
 576                         if (allocate == 0)
 577                                 goto free_range;
 578                         goto err_no_vma;
 579                 }
 580
 581                 vma = proc->vma;
 582                 if (vma && mm != proc->vma_vm_mm) {
 583                         pr_err("%d: vma mm and task mm mismatch\n",
 584                                 proc->pid);
 585                         vma = NULL;
 586                 }
 587         }
 588
 589         if (allocate == 0)
 590                 goto free_range;
 591
 592         if (vma == NULL) {
 593                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 594                         proc->pid);
 595                 goto err_no_vma;
 596         }
 597
 598         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 599                 int ret;
 600
 601                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 602
 603                 BUG_ON(*page);
 604                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 605                 if (*page == NULL) {
 606                         pr_err("%d: binder_alloc_buf failed for page at %pK\n",
 607                                 proc->pid, page_addr);
 608                         goto err_alloc_page_failed;
 609                 }
 610                 ret = map_kernel_range_noflush((unsigned long)page_addr,
 611                                         PAGE_SIZE, PAGE_KERNEL, page);
 612                 flush_cache_vmap((unsigned long)page_addr,
 613                                 (unsigned long)page_addr + PAGE_SIZE);
 614                 if (ret != 1) {
 615                         pr_err("%d: binder_alloc_buf failed to map page at %pK in kernel\n",
 616                                proc->pid, page_addr);
 617                         goto err_map_kernel_failed;
 618                 }
 619                 user_page_addr =
 620                         (uintptr_t)page_addr + proc->user_buffer_offset;
 621                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 622                 if (ret) {
 623                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 624                                proc->pid, user_page_addr);
 625                         goto err_vm_insert_page_failed;
 626                 }
 627                 /* vm_insert_page does not seem to increment the refcount */
 628         }
 629         if (mm) {
 630                 up_write(&mm->mmap_sem);
 631                 mmput(mm);
 632         }
 633         return 0;
 634
 635 free_range:
 636         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 637              page_addr -= PAGE_SIZE) {
 638                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 639                 if (vma)
 640                         zap_page_range(vma, (uintptr_t)page_addr +
 641                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 642 err_vm_insert_page_failed:
 643                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 644 err_map_kernel_failed:
 645                 __free_page(*page);
 646                 *page = NULL;
 647 err_alloc_page_failed:
 648                 ;
 649         }
 650 err_no_vma:
 651         if (mm) {
 652                 up_write(&mm->mmap_sem);
 653                 mmput(mm);
 654         }
 655         return -ENOMEM;
 656 }
 657
 658 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 659                                               size_t data_size,
 660                                               size_t offsets_size, int is_async)
 661 {
 662         struct rb_node *n = proc->free_buffers.rb_node;
 663         struct binder_buffer *buffer;
 664         size_t buffer_size;
 665         struct rb_node *best_fit = NULL;
 666         void *has_page_addr;
 667         void *end_page_addr;
 668         size_t size;
 669
 670         if (proc->vma == NULL) {
 671                 pr_err("%d: binder_alloc_buf, no vma\n",
 672                        proc->pid);
 673                 return NULL;
 674         }
 675
 676         size = ALIGN(data_size, sizeof(void *)) +
 677                 ALIGN(offsets_size, sizeof(void *));
 678
 679         if (size < data_size || size < offsets_size) {
 680                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 681                                 proc->pid, data_size, offsets_size);
 682                 return NULL;
 683         }
 684
 685         if (is_async &&
 686             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 687                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 688                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 689                               proc->pid, size);
 690                 return NULL;
 691         }
 692
 693         while (n) {
 694                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 695                 BUG_ON(!buffer->free);
 696                 buffer_size = binder_buffer_size(proc, buffer);
 697
 698                 if (size < buffer_size) {
 699                         best_fit = n;
 700                         n = n->rb_left;
 701                 } else if (size > buffer_size)
 702                         n = n->rb_right;
 703                 else {
 704                         best_fit = n;
 705                         break;
 706                 }
 707         }
 708         if (best_fit == NULL) {
 709                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 710                         proc->pid, size);
 711                 return NULL;
 712         }
 713         if (n == NULL) {
 714                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 715                 buffer_size = binder_buffer_size(proc, buffer);
 716         }
 717
 718         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 719                      "%d: binder_alloc_buf size %zd got buffer %pK size %zd\n",
 720                       proc->pid, size, buffer, buffer_size);
 721
 722         has_page_addr =
 723                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 724         if (n == NULL) {
 725                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 726                         buffer_size = size; /* no room for other buffers */
 727                 else
 728                         buffer_size = size + sizeof(struct binder_buffer);
 729         }
 730         end_page_addr =
 731                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 732         if (end_page_addr > has_page_addr)
 733                 end_page_addr = has_page_addr;
 734         if (binder_update_page_range(proc, 1,
 735             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 736                 return NULL;
 737
 738         rb_erase(best_fit, &proc->free_buffers);
 739         buffer->free = 0;
 740         binder_insert_allocated_buffer(proc, buffer);
 741         if (buffer_size != size) {
 742                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 743
 744                 list_add(&new_buffer->entry, &buffer->entry);
 745                 new_buffer->free = 1;
 746                 binder_insert_free_buffer(proc, new_buffer);
 747         }
 748         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 749                      "%d: binder_alloc_buf size %zd got %pK\n",
 750                       proc->pid, size, buffer);
 751         buffer->data_size = data_size;
 752         buffer->offsets_size = offsets_size;
 753         buffer->async_transaction = is_async;
 754         if (is_async) {
 755                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 756                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 757                              "%d: binder_alloc_buf size %zd async free %zd\n",
 758                               proc->pid, size, proc->free_async_space);
 759         }
 760
 761         return buffer;
 762 }
 763
 764 static void *buffer_start_page(struct binder_buffer *buffer)
 765 {
 766         return (void *)((uintptr_t)buffer & PAGE_MASK);
 767 }
 768
 769 static void *buffer_end_page(struct binder_buffer *buffer)
 770 {
 771         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 772 }
 773
 774 static void binder_delete_free_buffer(struct binder_proc *proc,
 775                                       struct binder_buffer *buffer)
 776 {
 777         struct binder_buffer *prev, *next = NULL;
 778         int free_page_end = 1;
 779         int free_page_start = 1;
 780
 781         BUG_ON(proc->buffers.next == &buffer->entry);
 782         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 783         BUG_ON(!prev->free);
 784         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 785                 free_page_start = 0;
 786                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 787                         free_page_end = 0;
 788                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 789                              "%d: merge free, buffer %pK share page with %pK\n",
 790                               proc->pid, buffer, prev);
 791         }
 792
 793         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 794                 next = list_entry(buffer->entry.next,
 795                                   struct binder_buffer, entry);
 796                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 797                         free_page_end = 0;
 798                         if (buffer_start_page(next) ==
 799                             buffer_start_page(buffer))
 800                                 free_page_start = 0;
 801                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 802                                      "%d: merge free, buffer %pK share page with %pK\n",
 803                                       proc->pid, buffer, prev);
 804                 }
 805         }
 806         list_del(&buffer->entry);
 807         if (free_page_start || free_page_end) {
 808                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 809                              "%d: merge free, buffer %pK do not share page%s%s with %pK or %pK\n",
 810                              proc->pid, buffer, free_page_start ? "" : " end",
 811                              free_page_end ? "" : " start", prev, next);
 812                 binder_update_page_range(proc, 0, free_page_start ?
 813                         buffer_start_page(buffer) : buffer_end_page(buffer),
 814                         (free_page_end ? buffer_end_page(buffer) :
 815                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 816         }
 817 }
 818
 819 static void binder_free_buf(struct binder_proc *proc,
 820                             struct binder_buffer *buffer)
 821 {
 822         size_t size, buffer_size;
 823
 824         buffer_size = binder_buffer_size(proc, buffer);
 825
 826         size = ALIGN(buffer->data_size, sizeof(void *)) +
 827                 ALIGN(buffer->offsets_size, sizeof(void *));
 828
 829         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 830                      "%d: binder_free_buf %pK size %zd buffer_size %zd\n",
 831                       proc->pid, buffer, size, buffer_size);
 832
 833         BUG_ON(buffer->free);
 834         BUG_ON(size > buffer_size);
 835         BUG_ON(buffer->transaction != NULL);
 836         BUG_ON((void *)buffer < proc->buffer);
 837         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 838
 839         if (buffer->async_transaction) {
 840                 proc->free_async_space += size + sizeof(struct binder_buffer);
 841
 842                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 843                              "%d: binder_free_buf size %zd async free %zd\n",
 844                               proc->pid, size, proc->free_async_space);
 845         }
 846
 847         binder_update_page_range(proc, 0,
 848                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 849                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 850                 NULL);
 851         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 852         buffer->free = 1;
 853         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 854                 struct binder_buffer *next = list_entry(buffer->entry.next,
 855                                                 struct binder_buffer, entry);
 856
 857                 if (next->free) {
 858                         rb_erase(&next->rb_node, &proc->free_buffers);
 859                         binder_delete_free_buffer(proc, next);
 860                 }
 861         }
 862         if (proc->buffers.next != &buffer->entry) {
 863                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 864                                                 struct binder_buffer, entry);
 865
 866                 if (prev->free) {
 867                         binder_delete_free_buffer(proc, buffer);
 868                         rb_erase(&prev->rb_node, &proc->free_buffers);
 869                         buffer = prev;
 870                 }
 871         }
 872         binder_insert_free_buffer(proc, buffer);
 873 }
 874
 875 static struct binder_node *binder_get_node(struct binder_proc *proc,
 876                                            binder_uintptr_t ptr)
 877 {
 878         struct rb_node *n = proc->nodes.rb_node;
 879         struct binder_node *node;
 880
 881         while (n) {
 882                 node = rb_entry(n, struct binder_node, rb_node);
 883
 884                 if (ptr < node->ptr)
 885                         n = n->rb_left;
 886                 else if (ptr > node->ptr)
 887                         n = n->rb_right;
 888                 else
 889                         return node;
 890         }
 891         return NULL;
 892 }
 893
 894 static struct binder_node *binder_new_node(struct binder_proc *proc,
 895                                            binder_uintptr_t ptr,
 896                                            binder_uintptr_t cookie)
 897 {
 898         struct rb_node **p = &proc->nodes.rb_node;
 899         struct rb_node *parent = NULL;
 900         struct binder_node *node;
 901
 902         while (*p) {
 903                 parent = *p;
 904                 node = rb_entry(parent, struct binder_node, rb_node);
 905
 906                 if (ptr < node->ptr)
 907                         p = &(*p)->rb_left;
 908                 else if (ptr > node->ptr)
 909                         p = &(*p)->rb_right;
 910                 else
 911                         return NULL;
 912         }
 913
 914         node = kzalloc(sizeof(*node), GFP_KERNEL);
 915         if (node == NULL)
 916                 return NULL;
 917         binder_stats_created(BINDER_STAT_NODE);
 918         rb_link_node(&node->rb_node, parent, p);
 919         rb_insert_color(&node->rb_node, &proc->nodes);
 920         node->debug_id = ++binder_last_id;
 921         node->proc = proc;
 922         node->ptr = ptr;
 923         node->cookie = cookie;
 924         node->work.type = BINDER_WORK_NODE;
 925         INIT_LIST_HEAD(&node->work.entry);
 926         INIT_LIST_HEAD(&node->async_todo);
 927         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 928                      "%d:%d node %d u%016llx c%016llx created\n",
 929                      proc->pid, current->pid, node->debug_id,
 930                      (u64)node->ptr, (u64)node->cookie);
 931         return node;
 932 }
 933
 934 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 935                            struct list_head *target_list)
 936 {
 937         if (strong) {
 938                 if (internal) {
 939                         if (target_list == NULL &&
 940                             node->internal_strong_refs == 0 &&
 941                             !(node == binder_context_mgr_node &&
 942                             node->has_strong_ref)) {
 943                                 pr_err("invalid inc strong node for %d\n",
 944                                         node->debug_id);
 945                                 return -EINVAL;
 946                         }
 947                         node->internal_strong_refs++;
 948                 } else
 949                         node->local_strong_refs++;
 950                 if (!node->has_strong_ref && target_list) {
 951                         list_del_init(&node->work.entry);
 952                         list_add_tail(&node->work.entry, target_list);
 953                 }
 954         } else {
 955                 if (!internal)
 956                         node->local_weak_refs++;
 957                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 958                         if (target_list == NULL) {
 959                                 pr_err("invalid inc weak node for %d\n",
 960                                         node->debug_id);
 961                                 return -EINVAL;
 962                         }
 963                         list_add_tail(&node->work.entry, target_list);
 964                 }
 965         }
 966         return 0;
 967 }
 968
 969 static int binder_dec_node(struct binder_node *node, int strong, int internal)
 970 {
 971         if (strong) {
 972                 if (internal)
 973                         node->internal_strong_refs--;
 974                 else
 975                         node->local_strong_refs--;
 976                 if (node->local_strong_refs || node->internal_strong_refs)
 977                         return 0;
 978         } else {
 979                 if (!internal)
 980                         node->local_weak_refs--;
 981                 if (node->local_weak_refs || !hlist_empty(&node->refs))
 982                         return 0;
 983         }
 984         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 985                 if (list_empty(&node->work.entry)) {
 986                         list_add_tail(&node->work.entry, &node->proc->todo);
 987                         wake_up_interruptible(&node->proc->wait);
 988                 }
 989         } else {
 990                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 991                     !node->local_weak_refs) {
 992                         list_del_init(&node->work.entry);
 993                         if (node->proc) {
 994                                 rb_erase(&node->rb_node, &node->proc->nodes);
 995                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 996                                              "refless node %d deleted\n",
 997                                              node->debug_id);
 998                         } else {
 999                                 hlist_del(&node->dead_node);
1000                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1001                                              "dead node %d deleted\n",
1002                                              node->debug_id);
1003                         }
1004                         kfree(node);
1005                         binder_stats_deleted(BINDER_STAT_NODE);
1006                 }
1007         }
1008
1009         return 0;
1010 }
1011
1012
1013 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1014                                          u32 desc, bool need_strong_ref)
1015 {
1016         struct rb_node *n = proc->refs_by_desc.rb_node;
1017         struct binder_ref *ref;
1018
1019         while (n) {
1020                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1021
1022                 if (desc < ref->desc) {
1023                         n = n->rb_left;
1024                 } else if (desc > ref->desc) {
1025                         n = n->rb_right;
1026                 } else if (need_strong_ref && !ref->strong) {
1027                         binder_user_error("tried to use weak ref as strong ref\n");
1028                         return NULL;
1029                 } else {
1030                         return ref;
1031                 }
1032         }
1033         return NULL;
1034 }
1035
1036 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1037                                                   struct binder_node *node)
1038 {
1039         struct rb_node *n;
1040         struct rb_node **p = &proc->refs_by_node.rb_node;
1041         struct rb_node *parent = NULL;
1042         struct binder_ref *ref, *new_ref;
1043
1044         while (*p) {
1045                 parent = *p;
1046                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1047
1048                 if (node < ref->node)
1049                         p = &(*p)->rb_left;
1050                 else if (node > ref->node)
1051                         p = &(*p)->rb_right;
1052                 else
1053                         return ref;
1054         }
1055         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1056         if (new_ref == NULL)
1057                 return NULL;
1058         binder_stats_created(BINDER_STAT_REF);
1059         new_ref->debug_id = ++binder_last_id;
1060         new_ref->proc = proc;
1061         new_ref->node = node;
1062         rb_link_node(&new_ref->rb_node_node, parent, p);
1063         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1064
1065         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1066         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1067                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1068                 if (ref->desc > new_ref->desc)
1069                         break;
1070                 new_ref->desc = ref->desc + 1;
1071         }
1072
1073         p = &proc->refs_by_desc.rb_node;
1074         while (*p) {
1075                 parent = *p;
1076                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1077
1078                 if (new_ref->desc < ref->desc)
1079                         p = &(*p)->rb_left;
1080                 else if (new_ref->desc > ref->desc)
1081                         p = &(*p)->rb_right;
1082                 else
1083                         BUG();
1084         }
1085         rb_link_node(&new_ref->rb_node_desc, parent, p);
1086         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1087         if (node) {
1088                 hlist_add_head(&new_ref->node_entry, &node->refs);
1089
1090                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1091                              "%d new ref %d desc %d for node %d\n",
1092                               proc->pid, new_ref->debug_id, new_ref->desc,
1093                               node->debug_id);
1094         } else {
1095                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1096                              "%d new ref %d desc %d for dead node\n",
1097                               proc->pid, new_ref->debug_id, new_ref->desc);
1098         }
1099         return new_ref;
1100 }
1101
1102 static void binder_delete_ref(struct binder_ref *ref)
1103 {
1104         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1105                      "%d delete ref %d desc %d for node %d\n",
1106                       ref->proc->pid, ref->debug_id, ref->desc,
1107                       ref->node->debug_id);
1108
1109         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1110         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1111         if (ref->strong)
1112                 binder_dec_node(ref->node, 1, 1);
1113         hlist_del(&ref->node_entry);
1114         binder_dec_node(ref->node, 0, 1);
1115         if (ref->death) {
1116                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1117                              "%d delete ref %d desc %d has death notification\n",
1118                               ref->proc->pid, ref->debug_id, ref->desc);
1119                 list_del(&ref->death->work.entry);
1120                 kfree(ref->death);
1121                 binder_stats_deleted(BINDER_STAT_DEATH);
1122         }
1123         kfree(ref);
1124         binder_stats_deleted(BINDER_STAT_REF);
1125 }
1126
1127 static int binder_inc_ref(struct binder_ref *ref, int strong,
1128                           struct list_head *target_list)
1129 {
1130         int ret;
1131
1132         if (strong) {
1133                 if (ref->strong == 0) {
1134                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1135                         if (ret)
1136                                 return ret;
1137                 }
1138                 ref->strong++;
1139         } else {
1140                 if (ref->weak == 0) {
1141                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1142                         if (ret)
1143                                 return ret;
1144                 }
1145                 ref->weak++;
1146         }
1147         return 0;
1148 }
1149
1150
1151 static int binder_dec_ref(struct binder_ref *ref, int strong)
1152 {
1153         if (strong) {
1154                 if (ref->strong == 0) {
1155                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1156                                           ref->proc->pid, ref->debug_id,
1157                                           ref->desc, ref->strong, ref->weak);
1158                         return -EINVAL;
1159                 }
1160                 ref->strong--;
1161                 if (ref->strong == 0) {
1162                         int ret;
1163
1164                         ret = binder_dec_node(ref->node, strong, 1);
1165                         if (ret)
1166                                 return ret;
1167                 }
1168         } else {
1169                 if (ref->weak == 0) {
1170                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1171                                           ref->proc->pid, ref->debug_id,
1172                                           ref->desc, ref->strong, ref->weak);
1173                         return -EINVAL;
1174                 }
1175                 ref->weak--;
1176         }
1177         if (ref->strong == 0 && ref->weak == 0)
1178                 binder_delete_ref(ref);
1179         return 0;
1180 }
1181
1182 static void binder_pop_transaction(struct binder_thread *target_thread,
1183                                    struct binder_transaction *t)
1184 {
1185         if (target_thread) {
1186                 BUG_ON(target_thread->transaction_stack != t);
1187                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1188                 target_thread->transaction_stack =
1189                         target_thread->transaction_stack->from_parent;
1190                 t->from = NULL;
1191         }
1192         t->need_reply = 0;
1193         if (t->buffer)
1194                 t->buffer->transaction = NULL;
1195         kfree(t);
1196         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1197 }
1198
1199 static void binder_send_failed_reply(struct binder_transaction *t,
1200                                      uint32_t error_code)
1201 {
1202         struct binder_thread *target_thread;
1203         struct binder_transaction *next;
1204
1205         BUG_ON(t->flags & TF_ONE_WAY);
1206         while (1) {
1207                 target_thread = t->from;
1208                 if (target_thread) {
1209                         if (target_thread->return_error != BR_OK &&
1210                            target_thread->return_error2 == BR_OK) {
1211                                 target_thread->return_error2 =
1212                                         target_thread->return_error;
1213                                 target_thread->return_error = BR_OK;
1214                         }
1215                         if (target_thread->return_error == BR_OK) {
1216                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1217                                              "send failed reply for transaction %d to %d:%d\n",
1218                                               t->debug_id,
1219                                               target_thread->proc->pid,
1220                                               target_thread->pid);
1221
1222                                 binder_pop_transaction(target_thread, t);
1223                                 target_thread->return_error = error_code;
1224                                 wake_up_interruptible(&target_thread->wait);
1225                         } else {
1226                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1227                                         target_thread->proc->pid,
1228                                         target_thread->pid,
1229                                         target_thread->return_error);
1230                         }
1231                         return;
1232                 }
1233                 next = t->from_parent;
1234
1235                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1236                              "send failed reply for transaction %d, target dead\n",
1237                              t->debug_id);
1238
1239                 binder_pop_transaction(target_thread, t);
1240                 if (next == NULL) {
1241                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1242                                      "reply failed, no target thread at root\n");
1243                         return;
1244                 }
1245                 t = next;
1246                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1247                              "reply failed, no target thread -- retry %d\n",
1248                               t->debug_id);
1249         }
1250 }
1251
1252 static void binder_transaction_buffer_release(struct binder_proc *proc,
1253                                               struct binder_buffer *buffer,
1254                                               binder_size_t *failed_at)
1255 {
1256         binder_size_t *offp, *off_end;
1257         int debug_id = buffer->debug_id;
1258
1259         binder_debug(BINDER_DEBUG_TRANSACTION,
1260                      "%d buffer release %d, size %zd-%zd, failed at %pK\n",
1261                      proc->pid, buffer->debug_id,
1262                      buffer->data_size, buffer->offsets_size, failed_at);
1263
1264         if (buffer->target_node)
1265                 binder_dec_node(buffer->target_node, 1, 0);
1266
1267         offp = (binder_size_t *)(buffer->data +
1268                                  ALIGN(buffer->data_size, sizeof(void *)));
1269         if (failed_at)
1270                 off_end = failed_at;
1271         else
1272                 off_end = (void *)offp + buffer->offsets_size;
1273         for (; offp < off_end; offp++) {
1274                 struct flat_binder_object *fp;
1275
1276                 if (*offp > buffer->data_size - sizeof(*fp) ||
1277                     buffer->data_size < sizeof(*fp) ||
1278                     !IS_ALIGNED(*offp, sizeof(u32))) {
1279                         pr_err("transaction release %d bad offset %lld, size %zd\n",
1280                                debug_id, (u64)*offp, buffer->data_size);
1281                         continue;
1282                 }
1283                 fp = (struct flat_binder_object *)(buffer->data + *offp);
1284                 switch (fp->type) {
1285                 case BINDER_TYPE_BINDER:
1286                 case BINDER_TYPE_WEAK_BINDER: {
1287                         struct binder_node *node = binder_get_node(proc, fp->binder);
1288
1289                         if (node == NULL) {
1290                                 pr_err("transaction release %d bad node %016llx\n",
1291                                        debug_id, (u64)fp->binder);
1292                                 break;
1293                         }
1294                         binder_debug(BINDER_DEBUG_TRANSACTION,
1295                                      "        node %d u%016llx\n",
1296                                      node->debug_id, (u64)node->ptr);
1297                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1298                 } break;
1299                 case BINDER_TYPE_HANDLE:
1300                 case BINDER_TYPE_WEAK_HANDLE: {
1301                         struct binder_ref *ref;
1302
1303                         ref = binder_get_ref(proc, fp->handle,
1304                                              fp->type == BINDER_TYPE_HANDLE);
1305
1306                         if (ref == NULL) {
1307                                 pr_err("transaction release %d bad handle %d\n",
1308                                  debug_id, fp->handle);
1309                                 break;
1310                         }
1311                         binder_debug(BINDER_DEBUG_TRANSACTION,
1312                                      "        ref %d desc %d (node %d)\n",
1313                                      ref->debug_id, ref->desc, ref->node->debug_id);
1314                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1315                 } break;
1316
1317                 case BINDER_TYPE_FD:
1318                         binder_debug(BINDER_DEBUG_TRANSACTION,
1319                                      "        fd %d\n", fp->handle);
1320                         if (failed_at)
1321                                 task_close_fd(proc, fp->handle);
1322                         break;
1323
1324                 default:
1325                         pr_err("transaction release %d bad object type %x\n",
1326                                 debug_id, fp->type);
1327                         break;
1328                 }
1329         }
1330 }
1331
1332 static void binder_transaction(struct binder_proc *proc,
1333                                struct binder_thread *thread,
1334                                struct binder_transaction_data *tr, int reply)
1335 {
1336         struct binder_transaction *t;
1337         struct binder_work *tcomplete;
1338         binder_size_t *offp, *off_end;
1339         struct binder_proc *target_proc;
1340         struct binder_thread *target_thread = NULL;
1341         struct binder_node *target_node = NULL;
1342         struct list_head *target_list;
1343         wait_queue_head_t *target_wait;
1344         struct binder_transaction *in_reply_to = NULL;
1345         struct binder_transaction_log_entry *e;
1346         uint32_t return_error;
1347
1348         e = binder_transaction_log_add(&binder_transaction_log);
1349         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1350         e->from_proc = proc->pid;
1351         e->from_thread = thread->pid;
1352         e->target_handle = tr->target.handle;
1353         e->data_size = tr->data_size;
1354         e->offsets_size = tr->offsets_size;
1355
1356         if (reply) {
1357                 in_reply_to = thread->transaction_stack;
1358                 if (in_reply_to == NULL) {
1359                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1360                                           proc->pid, thread->pid);
1361                         return_error = BR_FAILED_REPLY;
1362                         goto err_empty_call_stack;
1363                 }
1364                 binder_set_nice(in_reply_to->saved_priority);
1365                 if (in_reply_to->to_thread != thread) {
1366                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1367                                 proc->pid, thread->pid, in_reply_to->debug_id,
1368                                 in_reply_to->to_proc ?
1369                                 in_reply_to->to_proc->pid : 0,
1370                                 in_reply_to->to_thread ?
1371                                 in_reply_to->to_thread->pid : 0);
1372                         return_error = BR_FAILED_REPLY;
1373                         in_reply_to = NULL;
1374                         goto err_bad_call_stack;
1375                 }
1376                 thread->transaction_stack = in_reply_to->to_parent;
1377                 target_thread = in_reply_to->from;
1378                 if (target_thread == NULL) {
1379                         return_error = BR_DEAD_REPLY;
1380                         goto err_dead_binder;
1381                 }
1382                 if (target_thread->transaction_stack != in_reply_to) {
1383                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1384                                 proc->pid, thread->pid,
1385                                 target_thread->transaction_stack ?
1386                                 target_thread->transaction_stack->debug_id : 0,
1387                                 in_reply_to->debug_id);
1388                         return_error = BR_FAILED_REPLY;
1389                         in_reply_to = NULL;
1390                         target_thread = NULL;
1391                         goto err_dead_binder;
1392                 }
1393                 target_proc = target_thread->proc;
1394         } else {
1395                 if (tr->target.handle) {
1396                         struct binder_ref *ref;
1397
1398                         ref = binder_get_ref(proc, tr->target.handle, true);
1399                         if (ref == NULL) {
1400                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1401                                         proc->pid, thread->pid);
1402                                 return_error = BR_FAILED_REPLY;
1403                                 goto err_invalid_target_handle;
1404                         }
1405                         target_node = ref->node;
1406                 } else {
1407                         target_node = binder_context_mgr_node;
1408                         if (target_node == NULL) {
1409                                 return_error = BR_DEAD_REPLY;
1410                                 goto err_no_context_mgr_node;
1411                         }
1412                 }
1413                 e->to_node = target_node->debug_id;
1414                 target_proc = target_node->proc;
1415                 if (target_proc == NULL) {
1416                         return_error = BR_DEAD_REPLY;
1417                         goto err_dead_binder;
1418                 }
1419                 if (WARN_ON(proc == target_proc)) {
1420                         return_error = BR_FAILED_REPLY;
1421                         goto err_invalid_target_handle;
1422                 }
1423                 if (security_binder_transaction(proc->cred,
1424                                                 target_proc->cred) < 0) {
1425                         return_error = BR_FAILED_REPLY;
1426                         goto err_invalid_target_handle;
1427                 }
1428                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1429                         struct binder_transaction *tmp;
1430
1431                         tmp = thread->transaction_stack;
1432                         if (tmp->to_thread != thread) {
1433                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1434                                         proc->pid, thread->pid, tmp->debug_id,
1435                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1436                                         tmp->to_thread ?
1437                                         tmp->to_thread->pid : 0);
1438                                 return_error = BR_FAILED_REPLY;
1439                                 goto err_bad_call_stack;
1440                         }
1441                         while (tmp) {
1442                                 if (tmp->from && tmp->from->proc == target_proc)
1443                                         target_thread = tmp->from;
1444                                 tmp = tmp->from_parent;
1445                         }
1446                 }
1447         }
1448         if (target_thread) {
1449                 e->to_thread = target_thread->pid;
1450                 target_list = &target_thread->todo;
1451                 target_wait = &target_thread->wait;
1452         } else {
1453                 target_list = &target_proc->todo;
1454                 target_wait = &target_proc->wait;
1455         }
1456         e->to_proc = target_proc->pid;
1457
1458         /* TODO: reuse incoming transaction for reply */
1459         t = kzalloc(sizeof(*t), GFP_KERNEL);
1460         if (t == NULL) {
1461                 return_error = BR_FAILED_REPLY;
1462                 goto err_alloc_t_failed;
1463         }
1464         binder_stats_created(BINDER_STAT_TRANSACTION);
1465
1466         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1467         if (tcomplete == NULL) {
1468                 return_error = BR_FAILED_REPLY;
1469                 goto err_alloc_tcomplete_failed;
1470         }
1471         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1472
1473         t->debug_id = ++binder_last_id;
1474         e->debug_id = t->debug_id;
1475
1476         if (reply)
1477                 binder_debug(BINDER_DEBUG_TRANSACTION,
1478                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1479                              proc->pid, thread->pid, t->debug_id,
1480                              target_proc->pid, target_thread->pid,
1481                              (u64)tr->data.ptr.buffer,
1482                              (u64)tr->data.ptr.offsets,
1483                              (u64)tr->data_size, (u64)tr->offsets_size);
1484         else
1485                 binder_debug(BINDER_DEBUG_TRANSACTION,
1486                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1487                              proc->pid, thread->pid, t->debug_id,
1488                              target_proc->pid, target_node->debug_id,
1489                              (u64)tr->data.ptr.buffer,
1490                              (u64)tr->data.ptr.offsets,
1491                              (u64)tr->data_size, (u64)tr->offsets_size);
1492
1493         if (!reply && !(tr->flags & TF_ONE_WAY))
1494                 t->from = thread;
1495         else
1496                 t->from = NULL;
1497         t->sender_euid = task_euid(proc->tsk);
1498         t->to_proc = target_proc;
1499         t->to_thread = target_thread;
1500         t->code = tr->code;
1501         t->flags = tr->flags;
1502         t->priority = task_nice(current);
1503
1504         trace_binder_transaction(reply, t, target_node);
1505
1506         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1507                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1508         if (t->buffer == NULL) {
1509                 return_error = BR_FAILED_REPLY;
1510                 goto err_binder_alloc_buf_failed;
1511         }
1512         t->buffer->allow_user_free = 0;
1513         t->buffer->debug_id = t->debug_id;
1514         t->buffer->transaction = t;
1515         t->buffer->target_node = target_node;
1516         trace_binder_transaction_alloc_buf(t->buffer);
1517         if (target_node)
1518                 binder_inc_node(target_node, 1, 0, NULL);
1519
1520         offp = (binder_size_t *)(t->buffer->data +
1521                                  ALIGN(tr->data_size, sizeof(void *)));
1522
1523         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1524                            tr->data.ptr.buffer, tr->data_size)) {
1525                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1526                                 proc->pid, thread->pid);
1527                 return_error = BR_FAILED_REPLY;
1528                 goto err_copy_data_failed;
1529         }
1530         if (copy_from_user(offp, (const void __user *)(uintptr_t)
1531                            tr->data.ptr.offsets, tr->offsets_size)) {
1532                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1533                                 proc->pid, thread->pid);
1534                 return_error = BR_FAILED_REPLY;
1535                 goto err_copy_data_failed;
1536         }
1537         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1538                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1539                                 proc->pid, thread->pid, (u64)tr->offsets_size);
1540                 return_error = BR_FAILED_REPLY;
1541                 goto err_bad_offset;
1542         }
1543         off_end = (void *)offp + tr->offsets_size;
1544         for (; offp < off_end; offp++) {
1545                 struct flat_binder_object *fp;
1546
1547                 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1548                     t->buffer->data_size < sizeof(*fp) ||
1549                     !IS_ALIGNED(*offp, sizeof(u32))) {
1550                         binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
1551                                           proc->pid, thread->pid, (u64)*offp);
1552                         return_error = BR_FAILED_REPLY;
1553                         goto err_bad_offset;
1554                 }
1555                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1556                 switch (fp->type) {
1557                 case BINDER_TYPE_BINDER:
1558                 case BINDER_TYPE_WEAK_BINDER: {
1559                         struct binder_ref *ref;
1560                         struct binder_node *node = binder_get_node(proc, fp->binder);
1561
1562                         if (node == NULL) {
1563                                 node = binder_new_node(proc, fp->binder, fp->cookie);
1564                                 if (node == NULL) {
1565                                         return_error = BR_FAILED_REPLY;
1566                                         goto err_binder_new_node_failed;
1567                                 }
1568                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1569                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1570                         }
1571                         if (fp->cookie != node->cookie) {
1572                                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1573                                         proc->pid, thread->pid,
1574                                         (u64)fp->binder, node->debug_id,
1575                                         (u64)fp->cookie, (u64)node->cookie);
1576                                 return_error = BR_FAILED_REPLY;
1577                                 goto err_binder_get_ref_for_node_failed;
1578                         }
1579                         if (security_binder_transfer_binder(proc->cred,
1580                                                             target_proc->cred)) {
1581                                 return_error = BR_FAILED_REPLY;
1582                                 goto err_binder_get_ref_for_node_failed;
1583                         }
1584                         ref = binder_get_ref_for_node(target_proc, node);
1585                         if (ref == NULL) {
1586                                 return_error = BR_FAILED_REPLY;
1587                                 goto err_binder_get_ref_for_node_failed;
1588                         }
1589                         if (fp->type == BINDER_TYPE_BINDER)
1590                                 fp->type = BINDER_TYPE_HANDLE;
1591                         else
1592                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
1593                         fp->binder = 0;
1594                         fp->handle = ref->desc;
1595                         fp->cookie = 0;
1596                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1597                                        &thread->todo);
1598
1599                         trace_binder_transaction_node_to_ref(t, node, ref);
1600                         binder_debug(BINDER_DEBUG_TRANSACTION,
1601                                      "        node %d u%016llx -> ref %d desc %d\n",
1602                                      node->debug_id, (u64)node->ptr,
1603                                      ref->debug_id, ref->desc);
1604                 } break;
1605                 case BINDER_TYPE_HANDLE:
1606                 case BINDER_TYPE_WEAK_HANDLE: {
1607                         struct binder_ref *ref;
1608
1609                         ref = binder_get_ref(proc, fp->handle,
1610                                              fp->type == BINDER_TYPE_HANDLE);
1611
1612                         if (ref == NULL) {
1613                                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1614                                                 proc->pid,
1615                                                 thread->pid, fp->handle);
1616                                 return_error = BR_FAILED_REPLY;
1617                                 goto err_binder_get_ref_failed;
1618                         }
1619                         if (security_binder_transfer_binder(proc->cred,
1620                                                             target_proc->cred)) {
1621                                 return_error = BR_FAILED_REPLY;
1622                                 goto err_binder_get_ref_failed;
1623                         }
1624                         if (ref->node->proc == target_proc) {
1625                                 if (fp->type == BINDER_TYPE_HANDLE)
1626                                         fp->type = BINDER_TYPE_BINDER;
1627                                 else
1628                                         fp->type = BINDER_TYPE_WEAK_BINDER;
1629                                 fp->binder = ref->node->ptr;
1630                                 fp->cookie = ref->node->cookie;
1631                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1632                                 trace_binder_transaction_ref_to_node(t, ref);
1633                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1634                                              "        ref %d desc %d -> node %d u%016llx\n",
1635                                              ref->debug_id, ref->desc, ref->node->debug_id,
1636                                              (u64)ref->node->ptr);
1637                         } else {
1638                                 struct binder_ref *new_ref;
1639
1640                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1641                                 if (new_ref == NULL) {
1642                                         return_error = BR_FAILED_REPLY;
1643                                         goto err_binder_get_ref_for_node_failed;
1644                                 }
1645                                 fp->binder = 0;
1646                                 fp->handle = new_ref->desc;
1647                                 fp->cookie = 0;
1648                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1649                                 trace_binder_transaction_ref_to_ref(t, ref,
1650                                                                     new_ref);
1651                                 binder_debug(BINDER_DEBUG_TRANSACTION,
1652                                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1653                                              ref->debug_id, ref->desc, new_ref->debug_id,
1654                                              new_ref->desc, ref->node->debug_id);
1655                         }
1656                 } break;
1657
1658                 case BINDER_TYPE_FD: {
1659                         int target_fd;
1660                         struct file *file;
1661
1662                         if (reply) {
1663                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1664                                         binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1665                                                 proc->pid, thread->pid, fp->handle);
1666                                         return_error = BR_FAILED_REPLY;
1667                                         goto err_fd_not_allowed;
1668                                 }
1669                         } else if (!target_node->accept_fds) {
1670                                 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1671                                         proc->pid, thread->pid, fp->handle);
1672                                 return_error = BR_FAILED_REPLY;
1673                                 goto err_fd_not_allowed;
1674                         }
1675
1676                         file = fget(fp->handle);
1677                         if (file == NULL) {
1678                                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1679                                         proc->pid, thread->pid, fp->handle);
1680                                 return_error = BR_FAILED_REPLY;
1681                                 goto err_fget_failed;
1682                         }
1683                         if (security_binder_transfer_file(proc->cred,
1684                                                           target_proc->cred,
1685                                                           file) < 0) {
1686                                 fput(file);
1687                                 return_error = BR_FAILED_REPLY;
1688                                 goto err_get_unused_fd_failed;
1689                         }
1690                         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1691                         if (target_fd < 0) {
1692                                 fput(file);
1693                                 return_error = BR_FAILED_REPLY;
1694                                 goto err_get_unused_fd_failed;
1695                         }
1696                         task_fd_install(target_proc, target_fd, file);
1697                         trace_binder_transaction_fd(t, fp->handle, target_fd);
1698                         binder_debug(BINDER_DEBUG_TRANSACTION,
1699                                      "        fd %d -> %d\n", fp->handle, target_fd);
1700                         /* TODO: fput? */
1701                         fp->binder = 0;
1702                         fp->handle = target_fd;
1703                 } break;
1704
1705                 default:
1706                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1707                                 proc->pid, thread->pid, fp->type);
1708                         return_error = BR_FAILED_REPLY;
1709                         goto err_bad_object_type;
1710                 }
1711         }
1712         if (reply) {
1713                 BUG_ON(t->buffer->async_transaction != 0);
1714                 binder_pop_transaction(target_thread, in_reply_to);
1715         } else if (!(t->flags & TF_ONE_WAY)) {
1716                 BUG_ON(t->buffer->async_transaction != 0);
1717                 t->need_reply = 1;
1718                 t->from_parent = thread->transaction_stack;
1719                 thread->transaction_stack = t;
1720         } else {
1721                 BUG_ON(target_node == NULL);
1722                 BUG_ON(t->buffer->async_transaction != 1);
1723                 if (target_node->has_async_transaction) {
1724                         target_list = &target_node->async_todo;
1725                         target_wait = NULL;
1726                 } else
1727                         target_node->has_async_transaction = 1;
1728         }
1729         t->work.type = BINDER_WORK_TRANSACTION;
1730         list_add_tail(&t->work.entry, target_list);
1731         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1732         list_add_tail(&tcomplete->entry, &thread->todo);
1733         if (target_wait) {
1734                 if (reply || !(t->flags & TF_ONE_WAY))
1735                         wake_up_interruptible_sync(target_wait);
1736                 else
1737                         wake_up_interruptible(target_wait);
1738         }
1739         return;
1740
1741 err_get_unused_fd_failed:
1742 err_fget_failed:
1743 err_fd_not_allowed:
1744 err_binder_get_ref_for_node_failed:
1745 err_binder_get_ref_failed:
1746 err_binder_new_node_failed:
1747 err_bad_object_type:
1748 err_bad_offset:
1749 err_copy_data_failed:
1750         trace_binder_transaction_failed_buffer_release(t->buffer);
1751         binder_transaction_buffer_release(target_proc, t->buffer, offp);
1752         t->buffer->transaction = NULL;
1753         binder_free_buf(target_proc, t->buffer);
1754 err_binder_alloc_buf_failed:
1755         kfree(tcomplete);
1756         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1757 err_alloc_tcomplete_failed:
1758         kfree(t);
1759         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1760 err_alloc_t_failed:
1761 err_bad_call_stack:
1762 err_empty_call_stack:
1763 err_dead_binder:
1764 err_invalid_target_handle:
1765 err_no_context_mgr_node:
1766         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1767                      "%d:%d transaction failed %d, size %lld-%lld\n",
1768                      proc->pid, thread->pid, return_error,
1769                      (u64)tr->data_size, (u64)tr->offsets_size);
1770
1771         {
1772                 struct binder_transaction_log_entry *fe;
1773
1774                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1775                 *fe = *e;
1776         }
1777
1778         BUG_ON(thread->return_error != BR_OK);
1779         if (in_reply_to) {
1780                 thread->return_error = BR_TRANSACTION_COMPLETE;
1781                 binder_send_failed_reply(in_reply_to, return_error);
1782         } else
1783                 thread->return_error = return_error;
1784 }
1785
1786 static int binder_thread_write(struct binder_proc *proc,
1787                         struct binder_thread *thread,
1788                         binder_uintptr_t binder_buffer, size_t size,
1789                         binder_size_t *consumed)
1790 {
1791         uint32_t cmd;
1792         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1793         void __user *ptr = buffer + *consumed;
1794         void __user *end = buffer + size;
1795
1796         while (ptr < end && thread->return_error == BR_OK) {
1797                 if (get_user(cmd, (uint32_t __user *)ptr))
1798                         return -EFAULT;
1799                 ptr += sizeof(uint32_t);
1800                 trace_binder_command(cmd);
1801                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1802                         binder_stats.bc[_IOC_NR(cmd)]++;
1803                         proc->stats.bc[_IOC_NR(cmd)]++;
1804                         thread->stats.bc[_IOC_NR(cmd)]++;
1805                 }
1806                 switch (cmd) {
1807                 case BC_INCREFS:
1808                 case BC_ACQUIRE:
1809                 case BC_RELEASE:
1810                 case BC_DECREFS: {
1811                         uint32_t target;
1812                         struct binder_ref *ref;
1813                         const char *debug_string;
1814
1815                         if (get_user(target, (uint32_t __user *)ptr))
1816                                 return -EFAULT;
1817                         ptr += sizeof(uint32_t);
1818                         if (target == 0 && binder_context_mgr_node &&
1819                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1820                                 if (binder_context_mgr_node->proc == proc) {
1821                                         binder_user_error("%d:%d context manager tried to acquire desc 0\n",
1822                                                           proc->pid, thread->pid);
1823                                         return -EINVAL;
1824                                 }
1825                                 ref = binder_get_ref_for_node(proc,
1826                                                binder_context_mgr_node);
1827                                 if (ref->desc != target) {
1828                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1829                                                 proc->pid, thread->pid,
1830                                                 ref->desc);
1831                                 }
1832                         } else
1833                                 ref = binder_get_ref(proc, target,
1834                                                      cmd == BC_ACQUIRE ||
1835                                                      cmd == BC_RELEASE);
1836                         if (ref == NULL) {
1837                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1838                                         proc->pid, thread->pid, target);
1839                                 break;
1840                         }
1841                         switch (cmd) {
1842                         case BC_INCREFS:
1843                                 debug_string = "IncRefs";
1844                                 binder_inc_ref(ref, 0, NULL);
1845                                 break;
1846                         case BC_ACQUIRE:
1847                                 debug_string = "Acquire";
1848                                 binder_inc_ref(ref, 1, NULL);
1849                                 break;
1850                         case BC_RELEASE:
1851                                 debug_string = "Release";
1852                                 binder_dec_ref(ref, 1);
1853                                 break;
1854                         case BC_DECREFS:
1855                         default:
1856                                 debug_string = "DecRefs";
1857                                 binder_dec_ref(ref, 0);
1858                                 break;
1859                         }
1860                         binder_debug(BINDER_DEBUG_USER_REFS,
1861                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1862                                      proc->pid, thread->pid, debug_string, ref->debug_id,
1863                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1864                         break;
1865                 }
1866                 case BC_INCREFS_DONE:
1867                 case BC_ACQUIRE_DONE: {
1868                         binder_uintptr_t node_ptr;
1869                         binder_uintptr_t cookie;
1870                         struct binder_node *node;
1871
1872                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1873                                 return -EFAULT;
1874                         ptr += sizeof(binder_uintptr_t);
1875                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1876                                 return -EFAULT;
1877                         ptr += sizeof(binder_uintptr_t);
1878                         node = binder_get_node(proc, node_ptr);
1879                         if (node == NULL) {
1880                                 binder_user_error("%d:%d %s u%016llx no match\n",
1881                                         proc->pid, thread->pid,
1882                                         cmd == BC_INCREFS_DONE ?
1883                                         "BC_INCREFS_DONE" :
1884                                         "BC_ACQUIRE_DONE",
1885                                         (u64)node_ptr);
1886                                 break;
1887                         }
1888                         if (cookie != node->cookie) {
1889                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1890                                         proc->pid, thread->pid,
1891                                         cmd == BC_INCREFS_DONE ?
1892                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1893                                         (u64)node_ptr, node->debug_id,
1894                                         (u64)cookie, (u64)node->cookie);
1895                                 break;
1896                         }
1897                         if (cmd == BC_ACQUIRE_DONE) {
1898                                 if (node->pending_strong_ref == 0) {
1899                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1900                                                 proc->pid, thread->pid,
1901                                                 node->debug_id);
1902                                         break;
1903                                 }
1904                                 node->pending_strong_ref = 0;
1905                         } else {
1906                                 if (node->pending_weak_ref == 0) {
1907                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1908                                                 proc->pid, thread->pid,
1909                                                 node->debug_id);
1910                                         break;
1911                                 }
1912                                 node->pending_weak_ref = 0;
1913                         }
1914                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1915                         binder_debug(BINDER_DEBUG_USER_REFS,
1916                                      "%d:%d %s node %d ls %d lw %d\n",
1917                                      proc->pid, thread->pid,
1918                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1919                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
1920                         break;
1921                 }
1922                 case BC_ATTEMPT_ACQUIRE:
1923                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1924                         return -EINVAL;
1925                 case BC_ACQUIRE_RESULT:
1926                         pr_err("BC_ACQUIRE_RESULT not supported\n");
1927                         return -EINVAL;
1928
1929                 case BC_FREE_BUFFER: {
1930                         binder_uintptr_t data_ptr;
1931                         struct binder_buffer *buffer;
1932
1933                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1934                                 return -EFAULT;
1935                         ptr += sizeof(binder_uintptr_t);
1936
1937                         buffer = binder_buffer_lookup(proc, data_ptr);
1938                         if (buffer == NULL) {
1939                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1940                                         proc->pid, thread->pid, (u64)data_ptr);
1941                                 break;
1942                         }
1943                         if (!buffer->allow_user_free) {
1944                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1945                                         proc->pid, thread->pid, (u64)data_ptr);
1946                                 break;
1947                         }
1948                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
1949                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1950                                      proc->pid, thread->pid, (u64)data_ptr,
1951                                      buffer->debug_id,
1952                                      buffer->transaction ? "active" : "finished");
1953
1954                         if (buffer->transaction) {
1955                                 buffer->transaction->buffer = NULL;
1956                                 buffer->transaction = NULL;
1957                         }
1958                         if (buffer->async_transaction && buffer->target_node) {
1959                                 BUG_ON(!buffer->target_node->has_async_transaction);
1960                                 if (list_empty(&buffer->target_node->async_todo))
1961                                         buffer->target_node->has_async_transaction = 0;
1962                                 else
1963                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1964                         }
1965                         trace_binder_transaction_buffer_release(buffer);
1966                         binder_transaction_buffer_release(proc, buffer, NULL);
1967                         binder_free_buf(proc, buffer);
1968                         break;
1969                 }
1970
1971                 case BC_TRANSACTION:
1972                 case BC_REPLY: {
1973                         struct binder_transaction_data tr;
1974
1975                         if (copy_from_user(&tr, ptr, sizeof(tr)))
1976                                 return -EFAULT;
1977                         ptr += sizeof(tr);
1978                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1979                         break;
1980                 }
1981
1982                 case BC_REGISTER_LOOPER:
1983                         binder_debug(BINDER_DEBUG_THREADS,
1984                                      "%d:%d BC_REGISTER_LOOPER\n",
1985                                      proc->pid, thread->pid);
1986                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1987                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1988                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1989                                         proc->pid, thread->pid);
1990                         } else if (proc->requested_threads == 0) {
1991                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1992                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1993                                         proc->pid, thread->pid);
1994                         } else {
1995                                 proc->requested_threads--;
1996                                 proc->requested_threads_started++;
1997                         }
1998                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1999                         break;
2000                 case BC_ENTER_LOOPER:
2001                         binder_debug(BINDER_DEBUG_THREADS,
2002                                      "%d:%d BC_ENTER_LOOPER\n",
2003                                      proc->pid, thread->pid);
2004                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
2005                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2006                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
2007                                         proc->pid, thread->pid);
2008                         }
2009                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
2010                         break;
2011                 case BC_EXIT_LOOPER:
2012                         binder_debug(BINDER_DEBUG_THREADS,
2013                                      "%d:%d BC_EXIT_LOOPER\n",
2014                                      proc->pid, thread->pid);
2015                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
2016                         break;
2017
2018                 case BC_REQUEST_DEATH_NOTIFICATION:
2019                 case BC_CLEAR_DEATH_NOTIFICATION: {
2020                         uint32_t target;
2021                         binder_uintptr_t cookie;
2022                         struct binder_ref *ref;
2023                         struct binder_ref_death *death;
2024
2025                         if (get_user(target, (uint32_t __user *)ptr))
2026                                 return -EFAULT;
2027                         ptr += sizeof(uint32_t);
2028                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2029                                 return -EFAULT;
2030                         ptr += sizeof(binder_uintptr_t);
2031                         ref = binder_get_ref(proc, target, false);
2032                         if (ref == NULL) {
2033                                 binder_user_error("%d:%d %s invalid ref %d\n",
2034                                         proc->pid, thread->pid,
2035                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2036                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2037                                         "BC_CLEAR_DEATH_NOTIFICATION",
2038                                         target);
2039                                 break;
2040                         }
2041
2042                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2043                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2044                                      proc->pid, thread->pid,
2045                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2046                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2047                                      "BC_CLEAR_DEATH_NOTIFICATION",
2048                                      (u64)cookie, ref->debug_id, ref->desc,
2049                                      ref->strong, ref->weak, ref->node->debug_id);
2050
2051                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2052                                 if (ref->death) {
2053                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2054                                                 proc->pid, thread->pid);
2055                                         break;
2056                                 }
2057                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2058                                 if (death == NULL) {
2059                                         thread->return_error = BR_ERROR;
2060                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2061                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2062                                                      proc->pid, thread->pid);
2063                                         break;
2064                                 }
2065                                 binder_stats_created(BINDER_STAT_DEATH);
2066                                 INIT_LIST_HEAD(&death->work.entry);
2067                                 death->cookie = cookie;
2068                                 ref->death = death;
2069                                 if (ref->node->proc == NULL) {
2070                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2071                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2072                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2073                                         } else {
2074                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2075                                                 wake_up_interruptible(&proc->wait);
2076                                         }
2077                                 }
2078                         } else {
2079                                 if (ref->death == NULL) {
2080                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2081                                                 proc->pid, thread->pid);
2082                                         break;
2083                                 }
2084                                 death = ref->death;
2085                                 if (death->cookie != cookie) {
2086                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2087                                                 proc->pid, thread->pid,
2088                                                 (u64)death->cookie,
2089                                                 (u64)cookie);
2090                                         break;
2091                                 }
2092                                 ref->death = NULL;
2093                                 if (list_empty(&death->work.entry)) {
2094                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2095                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2096                                                 list_add_tail(&death->work.entry, &thread->todo);
2097                                         } else {
2098                                                 list_add_tail(&death->work.entry, &proc->todo);
2099                                                 wake_up_interruptible(&proc->wait);
2100                                         }
2101                                 } else {
2102                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2103                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2104                                 }
2105                         }
2106                 } break;
2107                 case BC_DEAD_BINDER_DONE: {
2108                         struct binder_work *w;
2109                         binder_uintptr_t cookie;
2110                         struct binder_ref_death *death = NULL;
2111
2112                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2113                                 return -EFAULT;
2114
2115                         ptr += sizeof(cookie);
2116                         list_for_each_entry(w, &proc->delivered_death, entry) {
2117                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2118
2119                                 if (tmp_death->cookie == cookie) {
2120                                         death = tmp_death;
2121                                         break;
2122                                 }
2123                         }
2124                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2125                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n",
2126                                      proc->pid, thread->pid, (u64)cookie,
2127                                      death);
2128                         if (death == NULL) {
2129                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2130                                         proc->pid, thread->pid, (u64)cookie);
2131                                 break;
2132                         }
2133
2134                         list_del_init(&death->work.entry);
2135                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2136                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2137                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2138                                         list_add_tail(&death->work.entry, &thread->todo);
2139                                 } else {
2140                                         list_add_tail(&death->work.entry, &proc->todo);
2141                                         wake_up_interruptible(&proc->wait);
2142                                 }
2143                         }
2144                 } break;
2145
2146                 default:
2147                         pr_err("%d:%d unknown command %d\n",
2148                                proc->pid, thread->pid, cmd);
2149                         return -EINVAL;
2150                 }
2151                 *consumed = ptr - buffer;
2152         }
2153         return 0;
2154 }
2155
2156 static void binder_stat_br(struct binder_proc *proc,
2157                            struct binder_thread *thread, uint32_t cmd)
2158 {
2159         trace_binder_return(cmd);
2160         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2161                 binder_stats.br[_IOC_NR(cmd)]++;
2162                 proc->stats.br[_IOC_NR(cmd)]++;
2163                 thread->stats.br[_IOC_NR(cmd)]++;
2164         }
2165 }
2166
2167 static int binder_has_proc_work(struct binder_proc *proc,
2168                                 struct binder_thread *thread)
2169 {
2170         return !list_empty(&proc->todo) ||
2171                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2172 }
2173
2174 static int binder_has_thread_work(struct binder_thread *thread)
2175 {
2176         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2177                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2178 }
2179
2180 static int binder_thread_read(struct binder_proc *proc,
2181                               struct binder_thread *thread,
2182                               binder_uintptr_t binder_buffer, size_t size,
2183                               binder_size_t *consumed, int non_block)
2184 {
2185         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2186         void __user *ptr = buffer + *consumed;
2187         void __user *end = buffer + size;
2188
2189         int ret = 0;
2190         int wait_for_proc_work;
2191
2192         if (*consumed == 0) {
2193                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2194                         return -EFAULT;
2195                 ptr += sizeof(uint32_t);
2196         }
2197
2198 retry:
2199         wait_for_proc_work = thread->transaction_stack == NULL &&
2200                                 list_empty(&thread->todo);
2201
2202         if (thread->return_error != BR_OK && ptr < end) {
2203                 if (thread->return_error2 != BR_OK) {
2204                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2205                                 return -EFAULT;
2206                         ptr += sizeof(uint32_t);
2207                         binder_stat_br(proc, thread, thread->return_error2);
2208                         if (ptr == end)
2209                                 goto done;
2210                         thread->return_error2 = BR_OK;
2211                 }
2212                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2213                         return -EFAULT;
2214                 ptr += sizeof(uint32_t);
2215                 binder_stat_br(proc, thread, thread->return_error);
2216                 thread->return_error = BR_OK;
2217                 goto done;
2218         }
2219
2220
2221         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2222         if (wait_for_proc_work)
2223                 proc->ready_threads++;
2224
2225         binder_unlock(__func__);
2226
2227         trace_binder_wait_for_work(wait_for_proc_work,
2228                                    !!thread->transaction_stack,
2229                                    !list_empty(&thread->todo));
2230         if (wait_for_proc_work) {
2231                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2232                                         BINDER_LOOPER_STATE_ENTERED))) {
2233                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2234                                 proc->pid, thread->pid, thread->looper);
2235                         wait_event_interruptible(binder_user_error_wait,
2236                                                  binder_stop_on_user_error < 2);
2237                 }
2238                 binder_set_nice(proc->default_priority);
2239                 if (non_block) {
2240                         if (!binder_has_proc_work(proc, thread))
2241                                 ret = -EAGAIN;
2242                 } else
2243                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2244         } else {
2245                 if (non_block) {
2246                         if (!binder_has_thread_work(thread))
2247                                 ret = -EAGAIN;
2248                 } else
2249                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2250         }
2251
2252         binder_lock(__func__);
2253
2254         if (wait_for_proc_work)
2255                 proc->ready_threads--;
2256         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2257
2258         if (ret)
2259                 return ret;
2260
2261         while (1) {
2262                 uint32_t cmd;
2263                 struct binder_transaction_data tr;
2264                 struct binder_work *w;
2265                 struct binder_transaction *t = NULL;
2266
2267                 if (!list_empty(&thread->todo)) {
2268                         w = list_first_entry(&thread->todo, struct binder_work,
2269                                              entry);
2270                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2271                         w = list_first_entry(&proc->todo, struct binder_work,
2272                                              entry);
2273                 } else {
2274                         /* no data added */
2275                         if (ptr - buffer == 4 &&
2276                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2277                                 goto retry;
2278                         break;
2279                 }
2280
2281                 if (end - ptr < sizeof(tr) + 4)
2282                         break;
2283
2284                 switch (w->type) {
2285                 case BINDER_WORK_TRANSACTION: {
2286                         t = container_of(w, struct binder_transaction, work);
2287                 } break;
2288                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2289                         cmd = BR_TRANSACTION_COMPLETE;
2290                         if (put_user(cmd, (uint32_t __user *)ptr))
2291                                 return -EFAULT;
2292                         ptr += sizeof(uint32_t);
2293
2294                         binder_stat_br(proc, thread, cmd);
2295                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2296                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2297                                      proc->pid, thread->pid);
2298
2299                         list_del(&w->entry);
2300                         kfree(w);
2301                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2302                 } break;
2303                 case BINDER_WORK_NODE: {
2304                         struct binder_node *node = container_of(w, struct binder_node, work);
2305                         uint32_t cmd = BR_NOOP;
2306                         const char *cmd_name;
2307                         int strong = node->internal_strong_refs || node->local_strong_refs;
2308                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2309
2310                         if (weak && !node->has_weak_ref) {
2311                                 cmd = BR_INCREFS;
2312                                 cmd_name = "BR_INCREFS";
2313                                 node->has_weak_ref = 1;
2314                                 node->pending_weak_ref = 1;
2315                                 node->local_weak_refs++;
2316                         } else if (strong && !node->has_strong_ref) {
2317                                 cmd = BR_ACQUIRE;
2318                                 cmd_name = "BR_ACQUIRE";
2319                                 node->has_strong_ref = 1;
2320                                 node->pending_strong_ref = 1;
2321                                 node->local_strong_refs++;
2322                         } else if (!strong && node->has_strong_ref) {
2323                                 cmd = BR_RELEASE;
2324                                 cmd_name = "BR_RELEASE";
2325                                 node->has_strong_ref = 0;
2326                         } else if (!weak && node->has_weak_ref) {
2327                                 cmd = BR_DECREFS;
2328                                 cmd_name = "BR_DECREFS";
2329                                 node->has_weak_ref = 0;
2330                         }
2331                         if (cmd != BR_NOOP) {
2332                                 if (put_user(cmd, (uint32_t __user *)ptr))
2333                                         return -EFAULT;
2334                                 ptr += sizeof(uint32_t);
2335                                 if (put_user(node->ptr,
2336                                              (binder_uintptr_t __user *)ptr))
2337                                         return -EFAULT;
2338                                 ptr += sizeof(binder_uintptr_t);
2339                                 if (put_user(node->cookie,
2340                                              (binder_uintptr_t __user *)ptr))
2341                                         return -EFAULT;
2342                                 ptr += sizeof(binder_uintptr_t);
2343
2344                                 binder_stat_br(proc, thread, cmd);
2345                                 binder_debug(BINDER_DEBUG_USER_REFS,
2346                                              "%d:%d %s %d u%016llx c%016llx\n",
2347                                              proc->pid, thread->pid, cmd_name,
2348                                              node->debug_id,
2349                                              (u64)node->ptr, (u64)node->cookie);
2350                         } else {
2351                                 list_del_init(&w->entry);
2352                                 if (!weak && !strong) {
2353                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2354                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2355                                                      proc->pid, thread->pid,
2356                                                      node->debug_id,
2357                                                      (u64)node->ptr,
2358                                                      (u64)node->cookie);
2359                                         rb_erase(&node->rb_node, &proc->nodes);
2360                                         kfree(node);
2361                                         binder_stats_deleted(BINDER_STAT_NODE);
2362                                 } else {
2363                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2364                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2365                                                      proc->pid, thread->pid,
2366                                                      node->debug_id,
2367                                                      (u64)node->ptr,
2368                                                      (u64)node->cookie);
2369                                 }
2370                         }
2371                 } break;
2372                 case BINDER_WORK_DEAD_BINDER:
2373                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2374                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2375                         struct binder_ref_death *death;
2376                         uint32_t cmd;
2377
2378                         death = container_of(w, struct binder_ref_death, work);
2379                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2380                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2381                         else
2382                                 cmd = BR_DEAD_BINDER;
2383                         if (put_user(cmd, (uint32_t __user *)ptr))
2384                                 return -EFAULT;
2385                         ptr += sizeof(uint32_t);
2386                         if (put_user(death->cookie,
2387                                      (binder_uintptr_t __user *)ptr))
2388                                 return -EFAULT;
2389                         ptr += sizeof(binder_uintptr_t);
2390                         binder_stat_br(proc, thread, cmd);
2391                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2392                                      "%d:%d %s %016llx\n",
2393                                       proc->pid, thread->pid,
2394                                       cmd == BR_DEAD_BINDER ?
2395                                       "BR_DEAD_BINDER" :
2396                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2397                                       (u64)death->cookie);
2398
2399                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2400                                 list_del(&w->entry);
2401                                 kfree(death);
2402                                 binder_stats_deleted(BINDER_STAT_DEATH);
2403                         } else
2404                                 list_move(&w->entry, &proc->delivered_death);
2405                         if (cmd == BR_DEAD_BINDER)
2406                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2407                 } break;
2408                 }
2409
2410                 if (!t)
2411                         continue;
2412
2413                 BUG_ON(t->buffer == NULL);
2414                 if (t->buffer->target_node) {
2415                         struct binder_node *target_node = t->buffer->target_node;
2416
2417                         tr.target.ptr = target_node->ptr;
2418                         tr.cookie =  target_node->cookie;
2419                         t->saved_priority = task_nice(current);
2420                         if (t->priority < target_node->min_priority &&
2421                             !(t->flags & TF_ONE_WAY))
2422                                 binder_set_nice(t->priority);
2423                         else if (!(t->flags & TF_ONE_WAY) ||
2424                                  t->saved_priority > target_node->min_priority)
2425                                 binder_set_nice(target_node->min_priority);
2426                         cmd = BR_TRANSACTION;
2427                 } else {
2428                         tr.target.ptr = 0;
2429                         tr.cookie = 0;
2430                         cmd = BR_REPLY;
2431                 }
2432                 tr.code = t->code;
2433                 tr.flags = t->flags;
2434                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2435
2436                 if (t->from) {
2437                         struct task_struct *sender = t->from->proc->tsk;
2438
2439                         tr.sender_pid = task_tgid_nr_ns(sender,
2440                                                         task_active_pid_ns(current));
2441                 } else {
2442                         tr.sender_pid = 0;
2443                 }
2444
2445                 tr.data_size = t->buffer->data_size;
2446                 tr.offsets_size = t->buffer->offsets_size;
2447                 tr.data.ptr.buffer = (binder_uintptr_t)(
2448                                         (uintptr_t)t->buffer->data +
2449                                         proc->user_buffer_offset);
2450                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2451                                         ALIGN(t->buffer->data_size,
2452                                             sizeof(void *));
2453
2454                 if (put_user(cmd, (uint32_t __user *)ptr))
2455                         return -EFAULT;
2456                 ptr += sizeof(uint32_t);
2457                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2458                         return -EFAULT;
2459                 ptr += sizeof(tr);
2460
2461                 trace_binder_transaction_received(t);
2462                 binder_stat_br(proc, thread, cmd);
2463                 binder_debug(BINDER_DEBUG_TRANSACTION,
2464                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2465                              proc->pid, thread->pid,
2466                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2467                              "BR_REPLY",
2468                              t->debug_id, t->from ? t->from->proc->pid : 0,
2469                              t->from ? t->from->pid : 0, cmd,
2470                              t->buffer->data_size, t->buffer->offsets_size,
2471                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2472
2473                 list_del(&t->work.entry);
2474                 t->buffer->allow_user_free = 1;
2475                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2476                         t->to_parent = thread->transaction_stack;
2477                         t->to_thread = thread;
2478                         thread->transaction_stack = t;
2479                 } else {
2480                         t->buffer->transaction = NULL;
2481                         kfree(t);
2482                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2483                 }
2484                 break;
2485         }
2486
2487 done:
2488
2489         *consumed = ptr - buffer;
2490         if (proc->requested_threads + proc->ready_threads == 0 &&
2491             proc->requested_threads_started < proc->max_threads &&
2492             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2493              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2494              /*spawn a new thread if we leave this out */) {
2495                 proc->requested_threads++;
2496                 binder_debug(BINDER_DEBUG_THREADS,
2497                              "%d:%d BR_SPAWN_LOOPER\n",
2498                              proc->pid, thread->pid);
2499                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2500                         return -EFAULT;
2501                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2502         }
2503         return 0;
2504 }
2505
2506 static void binder_release_work(struct list_head *list)
2507 {
2508         struct binder_work *w;
2509
2510         while (!list_empty(list)) {
2511                 w = list_first_entry(list, struct binder_work, entry);
2512                 list_del_init(&w->entry);
2513                 switch (w->type) {
2514                 case BINDER_WORK_TRANSACTION: {
2515                         struct binder_transaction *t;
2516
2517                         t = container_of(w, struct binder_transaction, work);
2518                         if (t->buffer->target_node &&
2519                             !(t->flags & TF_ONE_WAY)) {
2520                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2521                         } else {
2522                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2523                                         "undelivered transaction %d\n",
2524                                         t->debug_id);
2525                                 t->buffer->transaction = NULL;
2526                                 kfree(t);
2527                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2528                         }
2529                 } break;
2530                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2531                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2532                                 "undelivered TRANSACTION_COMPLETE\n");
2533                         kfree(w);
2534                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2535                 } break;
2536                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2537                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2538                         struct binder_ref_death *death;
2539
2540                         death = container_of(w, struct binder_ref_death, work);
2541                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2542                                 "undelivered death notification, %016llx\n",
2543                                 (u64)death->cookie);
2544                         kfree(death);
2545                         binder_stats_deleted(BINDER_STAT_DEATH);
2546                 } break;
2547                 default:
2548                         pr_err("unexpected work type, %d, not freed\n",
2549                                w->type);
2550                         break;
2551                 }
2552         }
2553
2554 }
2555
2556 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2557 {
2558         struct binder_thread *thread = NULL;
2559         struct rb_node *parent = NULL;
2560         struct rb_node **p = &proc->threads.rb_node;
2561
2562         while (*p) {
2563                 parent = *p;
2564                 thread = rb_entry(parent, struct binder_thread, rb_node);
2565
2566                 if (current->pid < thread->pid)
2567                         p = &(*p)->rb_left;
2568                 else if (current->pid > thread->pid)
2569                         p = &(*p)->rb_right;
2570                 else
2571                         break;
2572         }
2573         if (*p == NULL) {
2574                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2575                 if (thread == NULL)
2576                         return NULL;
2577                 binder_stats_created(BINDER_STAT_THREAD);
2578                 thread->proc = proc;
2579                 thread->pid = current->pid;
2580                 init_waitqueue_head(&thread->wait);
2581                 INIT_LIST_HEAD(&thread->todo);
2582                 rb_link_node(&thread->rb_node, parent, p);
2583                 rb_insert_color(&thread->rb_node, &proc->threads);
2584                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2585                 thread->return_error = BR_OK;
2586                 thread->return_error2 = BR_OK;
2587         }
2588         return thread;
2589 }
2590
2591 static int binder_free_thread(struct binder_proc *proc,
2592                               struct binder_thread *thread)
2593 {
2594         struct binder_transaction *t;
2595         struct binder_transaction *send_reply = NULL;
2596         int active_transactions = 0;
2597
2598         rb_erase(&thread->rb_node, &proc->threads);
2599         t = thread->transaction_stack;
2600         if (t && t->to_thread == thread)
2601                 send_reply = t;
2602         while (t) {
2603                 active_transactions++;
2604                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2605                              "release %d:%d transaction %d %s, still active\n",
2606                               proc->pid, thread->pid,
2607                              t->debug_id,
2608                              (t->to_thread == thread) ? "in" : "out");
2609
2610                 if (t->to_thread == thread) {
2611                         t->to_proc = NULL;
2612                         t->to_thread = NULL;
2613                         if (t->buffer) {
2614                                 t->buffer->transaction = NULL;
2615                                 t->buffer = NULL;
2616                         }
2617                         t = t->to_parent;
2618                 } else if (t->from == thread) {
2619                         t->from = NULL;
2620                         t = t->from_parent;
2621                 } else
2622                         BUG();
2623         }
2624
2625         /*
2626          * If this thread used poll, make sure we remove the waitqueue from any
2627          * poll data structures holding it.
2628          */
2629         if (thread->looper & BINDER_LOOPER_STATE_POLL)
2630                 wake_up_pollfree(&thread->wait);
2631
2632         /*
2633          * This is needed to avoid races between wake_up_pollfree() above and
2634          * someone else removing the last entry from the queue for other reasons
2635          * (e.g. ep_remove_wait_queue() being called due to an epoll file
2636          * descriptor being closed).  Such other users hold an RCU read lock, so
2637          * we can be sure they're done after we call synchronize_rcu().
2638          */
2639         if (thread->looper & BINDER_LOOPER_STATE_POLL)
2640                 synchronize_rcu();
2641
2642         if (send_reply)
2643                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2644         binder_release_work(&thread->todo);
2645         kfree(thread);
2646         binder_stats_deleted(BINDER_STAT_THREAD);
2647         return active_transactions;
2648 }
2649
2650 static unsigned int binder_poll(struct file *filp,
2651                                 struct poll_table_struct *wait)
2652 {
2653         struct binder_proc *proc = filp->private_data;
2654         struct binder_thread *thread = NULL;
2655         int wait_for_proc_work;
2656
2657         binder_lock(__func__);
2658
2659         thread = binder_get_thread(proc);
2660         if (!thread) {
2661                 binder_unlock(__func__);
2662                 return POLLERR;
2663         }
2664
2665         thread->looper |= BINDER_LOOPER_STATE_POLL;
2666
2667         wait_for_proc_work = thread->transaction_stack == NULL &&
2668                 list_empty(&thread->todo) && thread->return_error == BR_OK;
2669
2670         binder_unlock(__func__);
2671
2672         if (wait_for_proc_work) {
2673                 if (binder_has_proc_work(proc, thread))
2674                         return POLLIN;
2675                 poll_wait(filp, &proc->wait, wait);
2676                 if (binder_has_proc_work(proc, thread))
2677                         return POLLIN;
2678         } else {
2679                 if (binder_has_thread_work(thread))
2680                         return POLLIN;
2681                 poll_wait(filp, &thread->wait, wait);
2682                 if (binder_has_thread_work(thread))
2683                         return POLLIN;
2684         }
2685         return 0;
2686 }
2687
2688 static int binder_ioctl_write_read(struct file *filp,
2689                                 unsigned int cmd, unsigned long arg,
2690                                 struct binder_thread *thread)
2691 {
2692         int ret = 0;
2693         struct binder_proc *proc = filp->private_data;
2694         unsigned int size = _IOC_SIZE(cmd);
2695         void __user *ubuf = (void __user *)arg;
2696         struct binder_write_read bwr;
2697
2698         if (size != sizeof(struct binder_write_read)) {
2699                 ret = -EINVAL;
2700                 goto out;
2701         }
2702         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2703                 ret = -EFAULT;
2704                 goto out;
2705         }
2706         binder_debug(BINDER_DEBUG_READ_WRITE,
2707                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2708                      proc->pid, thread->pid,
2709                      (u64)bwr.write_size, (u64)bwr.write_buffer,
2710                      (u64)bwr.read_size, (u64)bwr.read_buffer);
2711
2712         if (bwr.write_size > 0) {
2713                 ret = binder_thread_write(proc, thread,
2714                                           bwr.write_buffer,
2715                                           bwr.write_size,
2716                                           &bwr.write_consumed);
2717                 trace_binder_write_done(ret);
2718                 if (ret < 0) {
2719                         bwr.read_consumed = 0;
2720                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2721                                 ret = -EFAULT;
2722                         goto out;
2723                 }
2724         }
2725         if (bwr.read_size > 0) {
2726                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2727                                          bwr.read_size,
2728                                          &bwr.read_consumed,
2729                                          filp->f_flags & O_NONBLOCK);
2730                 trace_binder_read_done(ret);
2731                 if (!list_empty(&proc->todo))
2732                         wake_up_interruptible(&proc->wait);
2733                 if (ret < 0) {
2734                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2735                                 ret = -EFAULT;
2736                         goto out;
2737                 }
2738         }
2739         binder_debug(BINDER_DEBUG_READ_WRITE,
2740                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2741                      proc->pid, thread->pid,
2742                      (u64)bwr.write_consumed, (u64)bwr.write_size,
2743                      (u64)bwr.read_consumed, (u64)bwr.read_size);
2744         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2745                 ret = -EFAULT;
2746                 goto out;
2747         }
2748 out:
2749         return ret;
2750 }
2751
2752 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2753 {
2754         int ret = 0;
2755         struct binder_proc *proc = filp->private_data;
2756         kuid_t curr_euid = current_euid();
2757
2758         if (binder_context_mgr_node != NULL) {
2759                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2760                 ret = -EBUSY;
2761                 goto out;
2762         }
2763         ret = security_binder_set_context_mgr(proc->cred);
2764         if (ret < 0)
2765                 goto out;
2766         if (uid_valid(binder_context_mgr_uid)) {
2767                 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2768                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2769                                from_kuid(&init_user_ns, curr_euid),
2770                                from_kuid(&init_user_ns,
2771                                         binder_context_mgr_uid));
2772                         ret = -EPERM;
2773                         goto out;
2774                 }
2775         } else {
2776                 binder_context_mgr_uid = curr_euid;
2777         }
2778         binder_context_mgr_node = binder_new_node(proc, 0, 0);
2779         if (binder_context_mgr_node == NULL) {
2780                 ret = -ENOMEM;
2781                 goto out;
2782         }
2783         binder_context_mgr_node->local_weak_refs++;
2784         binder_context_mgr_node->local_strong_refs++;
2785         binder_context_mgr_node->has_strong_ref = 1;
2786         binder_context_mgr_node->has_weak_ref = 1;
2787 out:
2788         return ret;
2789 }
2790
2791 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2792 {
2793         int ret;
2794         struct binder_proc *proc = filp->private_data;
2795         struct binder_thread *thread;
2796         unsigned int size = _IOC_SIZE(cmd);
2797         void __user *ubuf = (void __user *)arg;
2798
2799         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2800                         proc->pid, current->pid, cmd, arg);*/
2801
2802         trace_binder_ioctl(cmd, arg);
2803
2804         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2805         if (ret)
2806                 goto err_unlocked;
2807
2808         binder_lock(__func__);
2809         thread = binder_get_thread(proc);
2810         if (thread == NULL) {
2811                 ret = -ENOMEM;
2812                 goto err;
2813         }
2814
2815         switch (cmd) {
2816         case BINDER_WRITE_READ:
2817                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2818                 if (ret)
2819                         goto err;
2820                 break;
2821         case BINDER_SET_MAX_THREADS:
2822                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2823                         ret = -EINVAL;
2824                         goto err;
2825                 }
2826                 break;
2827         case BINDER_SET_CONTEXT_MGR:
2828                 ret = binder_ioctl_set_ctx_mgr(filp);
2829                 if (ret)
2830                         goto err;
2831                 break;
2832         case BINDER_THREAD_EXIT:
2833                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2834                              proc->pid, thread->pid);
2835                 binder_free_thread(proc, thread);
2836                 thread = NULL;
2837                 break;
2838         case BINDER_VERSION: {
2839                 struct binder_version __user *ver = ubuf;
2840
2841                 if (size != sizeof(struct binder_version)) {
2842                         ret = -EINVAL;
2843                         goto err;
2844                 }
2845                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2846                              &ver->protocol_version)) {
2847                         ret = -EINVAL;
2848                         goto err;
2849                 }
2850                 break;
2851         }
2852         default:
2853                 ret = -EINVAL;
2854                 goto err;
2855         }
2856         ret = 0;
2857 err:
2858         if (thread)
2859                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2860         binder_unlock(__func__);
2861         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2862         if (ret && ret != -ERESTARTSYS)
2863                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2864 err_unlocked:
2865         trace_binder_ioctl_done(ret);
2866         return ret;
2867 }
2868
2869 static void binder_vma_open(struct vm_area_struct *vma)
2870 {
2871         struct binder_proc *proc = vma->vm_private_data;
2872
2873         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2874                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2875                      proc->pid, vma->vm_start, vma->vm_end,
2876                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2877                      (unsigned long)pgprot_val(vma->vm_page_prot));
2878 }
2879
2880 static void binder_vma_close(struct vm_area_struct *vma)
2881 {
2882         struct binder_proc *proc = vma->vm_private_data;
2883
2884         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2885                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2886                      proc->pid, vma->vm_start, vma->vm_end,
2887                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2888                      (unsigned long)pgprot_val(vma->vm_page_prot));
2889         proc->vma = NULL;
2890         proc->vma_vm_mm = NULL;
2891         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2892 }
2893
2894 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2895 {
2896         return VM_FAULT_SIGBUS;
2897 }
2898
2899 static const struct vm_operations_struct binder_vm_ops = {
2900         .open = binder_vma_open,
2901         .close = binder_vma_close,
2902         .fault = binder_vm_fault,
2903 };
2904
2905 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2906 {
2907         int ret;
2908         struct vm_struct *area;
2909         struct binder_proc *proc = filp->private_data;
2910         const char *failure_string;
2911         struct binder_buffer *buffer;
2912
2913         if (proc->tsk != current->group_leader)
2914                 return -EINVAL;
2915
2916         if ((vma->vm_end - vma->vm_start) > SZ_4M)
2917                 vma->vm_end = vma->vm_start + SZ_4M;
2918
2919         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2920                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2921                      proc->pid, vma->vm_start, vma->vm_end,
2922                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2923                      (unsigned long)pgprot_val(vma->vm_page_prot));
2924
2925         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2926                 ret = -EPERM;
2927                 failure_string = "bad vm_flags";
2928                 goto err_bad_arg;
2929         }
2930         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2931
2932         mutex_lock(&binder_mmap_lock);
2933         if (proc->buffer) {
2934                 ret = -EBUSY;
2935                 failure_string = "already mapped";
2936                 goto err_already_mapped;
2937         }
2938
2939         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2940         if (area == NULL) {
2941                 ret = -ENOMEM;
2942                 failure_string = "get_vm_area";
2943                 goto err_get_vm_area_failed;
2944         }
2945         proc->buffer = area->addr;
2946         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2947         mutex_unlock(&binder_mmap_lock);
2948
2949 #ifdef CONFIG_CPU_CACHE_VIPT
2950         if (cache_is_vipt_aliasing()) {
2951                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2952                         pr_info("binder_mmap: %d %lx-%lx maps %pK bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2953                         vma->vm_start += PAGE_SIZE;
2954                 }
2955         }
2956 #endif
2957         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2958         if (proc->pages == NULL) {
2959                 ret = -ENOMEM;
2960                 failure_string = "alloc page array";
2961                 goto err_alloc_pages_failed;
2962         }
2963         proc->buffer_size = vma->vm_end - vma->vm_start;
2964
2965         vma->vm_ops = &binder_vm_ops;
2966         vma->vm_private_data = proc;
2967
2968         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2969                 ret = -ENOMEM;
2970                 failure_string = "alloc small buf";
2971                 goto err_alloc_small_buf_failed;
2972         }
2973         buffer = proc->buffer;
2974         INIT_LIST_HEAD(&proc->buffers);
2975         list_add(&buffer->entry, &proc->buffers);
2976         buffer->free = 1;
2977         binder_insert_free_buffer(proc, buffer);
2978         proc->free_async_space = proc->buffer_size / 2;
2979         barrier();
2980         proc->files = get_files_struct(current);
2981         proc->vma = vma;
2982         proc->vma_vm_mm = vma->vm_mm;
2983
2984         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2985                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2986         return 0;
2987
2988 err_alloc_small_buf_failed:
2989         kfree(proc->pages);
2990         proc->pages = NULL;
2991 err_alloc_pages_failed:
2992         mutex_lock(&binder_mmap_lock);
2993         vfree(proc->buffer);
2994         proc->buffer = NULL;
2995 err_get_vm_area_failed:
2996 err_already_mapped:
2997         mutex_unlock(&binder_mmap_lock);
2998 err_bad_arg:
2999         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
3000                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
3001         return ret;
3002 }
3003
3004 static int binder_open(struct inode *nodp, struct file *filp)
3005 {
3006         struct binder_proc *proc;
3007
3008         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
3009                      current->group_leader->pid, current->pid);
3010
3011         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
3012         if (proc == NULL)
3013                 return -ENOMEM;
3014         get_task_struct(current->group_leader);
3015         proc->tsk = current->group_leader;
3016         proc->cred = get_cred(filp->f_cred);
3017         INIT_LIST_HEAD(&proc->todo);
3018         init_waitqueue_head(&proc->wait);
3019         proc->default_priority = task_nice(current);
3020
3021         binder_lock(__func__);
3022
3023         binder_stats_created(BINDER_STAT_PROC);
3024         hlist_add_head(&proc->proc_node, &binder_procs);
3025         proc->pid = current->group_leader->pid;
3026         INIT_LIST_HEAD(&proc->delivered_death);
3027         filp->private_data = proc;
3028
3029         binder_unlock(__func__);
3030
3031         if (binder_debugfs_dir_entry_proc) {
3032                 char strbuf[11];
3033
3034                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3035                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3036                         binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
3037         }
3038
3039         return 0;
3040 }
3041
3042 static int binder_flush(struct file *filp, fl_owner_t id)
3043 {
3044         struct binder_proc *proc = filp->private_data;
3045
3046         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3047
3048         return 0;
3049 }
3050
3051 static void binder_deferred_flush(struct binder_proc *proc)
3052 {
3053         struct rb_node *n;
3054         int wake_count = 0;
3055
3056         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3057                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3058
3059                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3060                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3061                         wake_up_interruptible(&thread->wait);
3062                         wake_count++;
3063                 }
3064         }
3065         wake_up_interruptible_all(&proc->wait);
3066
3067         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3068                      "binder_flush: %d woke %d threads\n", proc->pid,
3069                      wake_count);
3070 }
3071
3072 static int binder_release(struct inode *nodp, struct file *filp)
3073 {
3074         struct binder_proc *proc = filp->private_data;
3075
3076         debugfs_remove(proc->debugfs_entry);
3077         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3078
3079         return 0;
3080 }
3081
3082 static int binder_node_release(struct binder_node *node, int refs)
3083 {
3084         struct binder_ref *ref;
3085         int death = 0;
3086
3087         list_del_init(&node->work.entry);
3088         binder_release_work(&node->async_todo);
3089
3090         if (hlist_empty(&node->refs)) {
3091                 kfree(node);
3092                 binder_stats_deleted(BINDER_STAT_NODE);
3093
3094                 return refs;
3095         }
3096
3097         node->proc = NULL;
3098         node->local_strong_refs = 0;
3099         node->local_weak_refs = 0;
3100         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3101
3102         hlist_for_each_entry(ref, &node->refs, node_entry) {
3103                 refs++;
3104
3105                 if (!ref->death)
3106                         continue;
3107
3108                 death++;
3109
3110                 if (list_empty(&ref->death->work.entry)) {
3111                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3112                         list_add_tail(&ref->death->work.entry,
3113                                       &ref->proc->todo);
3114                         wake_up_interruptible(&ref->proc->wait);
3115                 } else
3116                         BUG();
3117         }
3118
3119         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3120                      "node %d now dead, refs %d, death %d\n",
3121                      node->debug_id, refs, death);
3122
3123         return refs;
3124 }
3125
3126 static void binder_deferred_release(struct binder_proc *proc)
3127 {
3128         struct binder_transaction *t;
3129         struct rb_node *n;
3130         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3131                 active_transactions, page_count;
3132
3133         BUG_ON(proc->vma);
3134         BUG_ON(proc->files);
3135
3136         hlist_del(&proc->proc_node);
3137
3138         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3139                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3140                              "%s: %d context_mgr_node gone\n",
3141                              __func__, proc->pid);
3142                 binder_context_mgr_node = NULL;
3143         }
3144
3145         threads = 0;
3146         active_transactions = 0;
3147         while ((n = rb_first(&proc->threads))) {
3148                 struct binder_thread *thread;
3149
3150                 thread = rb_entry(n, struct binder_thread, rb_node);
3151                 threads++;
3152                 active_transactions += binder_free_thread(proc, thread);
3153         }
3154
3155         nodes = 0;
3156         incoming_refs = 0;
3157         while ((n = rb_first(&proc->nodes))) {
3158                 struct binder_node *node;
3159
3160                 node = rb_entry(n, struct binder_node, rb_node);
3161                 nodes++;
3162                 rb_erase(&node->rb_node, &proc->nodes);
3163                 incoming_refs = binder_node_release(node, incoming_refs);
3164         }
3165
3166         outgoing_refs = 0;
3167         while ((n = rb_first(&proc->refs_by_desc))) {
3168                 struct binder_ref *ref;
3169
3170                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3171                 outgoing_refs++;
3172                 binder_delete_ref(ref);
3173         }
3174
3175         binder_release_work(&proc->todo);
3176         binder_release_work(&proc->delivered_death);
3177
3178         buffers = 0;
3179         while ((n = rb_first(&proc->allocated_buffers))) {
3180                 struct binder_buffer *buffer;
3181
3182                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3183
3184                 t = buffer->transaction;
3185                 if (t) {
3186                         t->buffer = NULL;
3187                         buffer->transaction = NULL;
3188                         pr_err("release proc %d, transaction %d, not freed\n",
3189                                proc->pid, t->debug_id);
3190                         /*BUG();*/
3191                 }
3192
3193                 binder_free_buf(proc, buffer);
3194                 buffers++;
3195         }
3196
3197         binder_stats_deleted(BINDER_STAT_PROC);
3198
3199         page_count = 0;
3200         if (proc->pages) {
3201                 int i;
3202
3203                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3204                         void *page_addr;
3205
3206                         if (!proc->pages[i])
3207                                 continue;
3208
3209                         page_addr = proc->buffer + i * PAGE_SIZE;
3210                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3211                                      "%s: %d: page %d at %pK not freed\n",
3212                                      __func__, proc->pid, i, page_addr);
3213                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3214                         __free_page(proc->pages[i]);
3215                         page_count++;
3216                 }
3217                 kfree(proc->pages);
3218                 vfree(proc->buffer);
3219         }
3220
3221         put_task_struct(proc->tsk);
3222         put_cred(proc->cred);
3223
3224         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3225                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3226                      __func__, proc->pid, threads, nodes, incoming_refs,
3227                      outgoing_refs, active_transactions, buffers, page_count);
3228
3229         kfree(proc);
3230 }
3231
3232 static void binder_deferred_func(struct work_struct *work)
3233 {
3234         struct binder_proc *proc;
3235         struct files_struct *files;
3236
3237         int defer;
3238
3239         do {
3240                 binder_lock(__func__);
3241                 mutex_lock(&binder_deferred_lock);
3242                 if (!hlist_empty(&binder_deferred_list)) {
3243                         proc = hlist_entry(binder_deferred_list.first,
3244                                         struct binder_proc, deferred_work_node);
3245                         hlist_del_init(&proc->deferred_work_node);
3246                         defer = proc->deferred_work;
3247                         proc->deferred_work = 0;
3248                 } else {
3249                         proc = NULL;
3250                         defer = 0;
3251                 }
3252                 mutex_unlock(&binder_deferred_lock);
3253
3254                 files = NULL;
3255                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3256                         files = proc->files;
3257                         if (files)
3258                                 proc->files = NULL;
3259                 }
3260
3261                 if (defer & BINDER_DEFERRED_FLUSH)
3262                         binder_deferred_flush(proc);
3263
3264                 if (defer & BINDER_DEFERRED_RELEASE)
3265                         binder_deferred_release(proc); /* frees proc */
3266
3267                 binder_unlock(__func__);
3268                 if (files)
3269                         put_files_struct(files);
3270         } while (proc);
3271 }
3272 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3273
3274 static void
3275 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3276 {
3277         mutex_lock(&binder_deferred_lock);
3278         proc->deferred_work |= defer;
3279         if (hlist_unhashed(&proc->deferred_work_node)) {
3280                 hlist_add_head(&proc->deferred_work_node,
3281                                 &binder_deferred_list);
3282                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3283         }
3284         mutex_unlock(&binder_deferred_lock);
3285 }
3286
3287 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3288                                      struct binder_transaction *t)
3289 {
3290         seq_printf(m,
3291                    "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3292                    prefix, t->debug_id, t,
3293                    t->from ? t->from->proc->pid : 0,
3294                    t->from ? t->from->pid : 0,
3295                    t->to_proc ? t->to_proc->pid : 0,
3296                    t->to_thread ? t->to_thread->pid : 0,
3297                    t->code, t->flags, t->priority, t->need_reply);
3298         if (t->buffer == NULL) {
3299                 seq_puts(m, " buffer free\n");
3300                 return;
3301         }
3302         if (t->buffer->target_node)
3303                 seq_printf(m, " node %d",
3304                            t->buffer->target_node->debug_id);
3305         seq_printf(m, " size %zd:%zd data %pK\n",
3306                    t->buffer->data_size, t->buffer->offsets_size,
3307                    t->buffer->data);
3308 }
3309
3310 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3311                                 struct binder_buffer *buffer)
3312 {
3313         seq_printf(m, "%s %d: %pK size %zd:%zd %s\n",
3314                    prefix, buffer->debug_id, buffer->data,
3315                    buffer->data_size, buffer->offsets_size,
3316                    buffer->transaction ? "active" : "delivered");
3317 }
3318
3319 static void print_binder_work(struct seq_file *m, const char *prefix,
3320                               const char *transaction_prefix,
3321                               struct binder_work *w)
3322 {
3323         struct binder_node *node;
3324         struct binder_transaction *t;
3325
3326         switch (w->type) {
3327         case BINDER_WORK_TRANSACTION:
3328                 t = container_of(w, struct binder_transaction, work);
3329                 print_binder_transaction(m, transaction_prefix, t);
3330                 break;
3331         case BINDER_WORK_TRANSACTION_COMPLETE:
3332                 seq_printf(m, "%stransaction complete\n", prefix);
3333                 break;
3334         case BINDER_WORK_NODE:
3335                 node = container_of(w, struct binder_node, work);
3336                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3337                            prefix, node->debug_id,
3338                            (u64)node->ptr, (u64)node->cookie);
3339                 break;
3340         case BINDER_WORK_DEAD_BINDER:
3341                 seq_printf(m, "%shas dead binder\n", prefix);
3342                 break;
3343         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3344                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3345                 break;
3346         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3347                 seq_printf(m, "%shas cleared death notification\n", prefix);
3348                 break;
3349         default:
3350                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3351                 break;
3352         }
3353 }
3354
3355 static void print_binder_thread(struct seq_file *m,
3356                                 struct binder_thread *thread,
3357                                 int print_always)
3358 {
3359         struct binder_transaction *t;
3360         struct binder_work *w;
3361         size_t start_pos = m->count;
3362         size_t header_pos;
3363
3364         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3365         header_pos = m->count;
3366         t = thread->transaction_stack;
3367         while (t) {
3368                 if (t->from == thread) {
3369                         print_binder_transaction(m,
3370                                                  "    outgoing transaction", t);
3371                         t = t->from_parent;
3372                 } else if (t->to_thread == thread) {
3373                         print_binder_transaction(m,
3374                                                  "    incoming transaction", t);
3375                         t = t->to_parent;
3376                 } else {
3377                         print_binder_transaction(m, "    bad transaction", t);
3378                         t = NULL;
3379                 }
3380         }
3381         list_for_each_entry(w, &thread->todo, entry) {
3382                 print_binder_work(m, "    ", "    pending transaction", w);
3383         }
3384         if (!print_always && m->count == header_pos)
3385                 m->count = start_pos;
3386 }
3387
3388 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3389 {
3390         struct binder_ref *ref;
3391         struct binder_work *w;
3392         int count;
3393
3394         count = 0;
3395         hlist_for_each_entry(ref, &node->refs, node_entry)
3396                 count++;
3397
3398         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3399                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3400                    node->has_strong_ref, node->has_weak_ref,
3401                    node->local_strong_refs, node->local_weak_refs,
3402                    node->internal_strong_refs, count);
3403         if (count) {
3404                 seq_puts(m, " proc");
3405                 hlist_for_each_entry(ref, &node->refs, node_entry)
3406                         seq_printf(m, " %d", ref->proc->pid);
3407         }
3408         seq_puts(m, "\n");
3409         list_for_each_entry(w, &node->async_todo, entry)
3410                 print_binder_work(m, "    ",
3411                                   "    pending async transaction", w);
3412 }
3413
3414 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3415 {
3416         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %pK\n",
3417                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3418                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3419 }
3420
3421 static void print_binder_proc(struct seq_file *m,
3422                               struct binder_proc *proc, int print_all)
3423 {
3424         struct binder_work *w;
3425         struct rb_node *n;
3426         size_t start_pos = m->count;
3427         size_t header_pos;
3428
3429         seq_printf(m, "proc %d\n", proc->pid);
3430         header_pos = m->count;
3431
3432         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3433                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3434                                                 rb_node), print_all);
3435         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3436                 struct binder_node *node = rb_entry(n, struct binder_node,
3437                                                     rb_node);
3438                 if (print_all || node->has_async_transaction)
3439                         print_binder_node(m, node);
3440         }
3441         if (print_all) {
3442                 for (n = rb_first(&proc->refs_by_desc);
3443                      n != NULL;
3444                      n = rb_next(n))
3445                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3446                                                      rb_node_desc));
3447         }
3448         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3449                 print_binder_buffer(m, "  buffer",
3450                                     rb_entry(n, struct binder_buffer, rb_node));
3451         list_for_each_entry(w, &proc->todo, entry)
3452                 print_binder_work(m, "  ", "  pending transaction", w);
3453         list_for_each_entry(w, &proc->delivered_death, entry) {
3454                 seq_puts(m, "  has delivered dead binder\n");
3455                 break;
3456         }
3457         if (!print_all && m->count == header_pos)
3458                 m->count = start_pos;
3459 }
3460
3461 static const char * const binder_return_strings[] = {
3462         "BR_ERROR",
3463         "BR_OK",
3464         "BR_TRANSACTION",
3465         "BR_REPLY",
3466         "BR_ACQUIRE_RESULT",
3467         "BR_DEAD_REPLY",
3468         "BR_TRANSACTION_COMPLETE",
3469         "BR_INCREFS",
3470         "BR_ACQUIRE",
3471         "BR_RELEASE",
3472         "BR_DECREFS",
3473         "BR_ATTEMPT_ACQUIRE",
3474         "BR_NOOP",
3475         "BR_SPAWN_LOOPER",
3476         "BR_FINISHED",
3477         "BR_DEAD_BINDER",
3478         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3479         "BR_FAILED_REPLY"
3480 };
3481
3482 static const char * const binder_command_strings[] = {
3483         "BC_TRANSACTION",
3484         "BC_REPLY",
3485         "BC_ACQUIRE_RESULT",
3486         "BC_FREE_BUFFER",
3487         "BC_INCREFS",
3488         "BC_ACQUIRE",
3489         "BC_RELEASE",
3490         "BC_DECREFS",
3491         "BC_INCREFS_DONE",
3492         "BC_ACQUIRE_DONE",
3493         "BC_ATTEMPT_ACQUIRE",
3494         "BC_REGISTER_LOOPER",
3495         "BC_ENTER_LOOPER",
3496         "BC_EXIT_LOOPER",
3497         "BC_REQUEST_DEATH_NOTIFICATION",
3498         "BC_CLEAR_DEATH_NOTIFICATION",
3499         "BC_DEAD_BINDER_DONE"
3500 };
3501
3502 static const char * const binder_objstat_strings[] = {
3503         "proc",
3504         "thread",
3505         "node",
3506         "ref",
3507         "death",
3508         "transaction",
3509         "transaction_complete"
3510 };
3511
3512 static void print_binder_stats(struct seq_file *m, const char *prefix,
3513                                struct binder_stats *stats)
3514 {
3515         int i;
3516
3517         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3518                      ARRAY_SIZE(binder_command_strings));
3519         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3520                 if (stats->bc[i])
3521                         seq_printf(m, "%s%s: %d\n", prefix,
3522                                    binder_command_strings[i], stats->bc[i]);
3523         }
3524
3525         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3526                      ARRAY_SIZE(binder_return_strings));
3527         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3528                 if (stats->br[i])
3529                         seq_printf(m, "%s%s: %d\n", prefix,
3530                                    binder_return_strings[i], stats->br[i]);
3531         }
3532
3533         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3534                      ARRAY_SIZE(binder_objstat_strings));
3535         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3536                      ARRAY_SIZE(stats->obj_deleted));
3537         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3538                 if (stats->obj_created[i] || stats->obj_deleted[i])
3539                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
3540                                 binder_objstat_strings[i],
3541                                 stats->obj_created[i] - stats->obj_deleted[i],
3542                                 stats->obj_created[i]);
3543         }
3544 }
3545
3546 static void print_binder_proc_stats(struct seq_file *m,
3547                                     struct binder_proc *proc)
3548 {
3549         struct binder_work *w;
3550         struct rb_node *n;
3551         int count, strong, weak;
3552
3553         seq_printf(m, "proc %d\n", proc->pid);
3554         count = 0;
3555         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3556                 count++;
3557         seq_printf(m, "  threads: %d\n", count);
3558         seq_printf(m, "  requested threads: %d+%d/%d\n"
3559                         "  ready threads %d\n"
3560                         "  free async space %zd\n", proc->requested_threads,
3561                         proc->requested_threads_started, proc->max_threads,
3562                         proc->ready_threads, proc->free_async_space);
3563         count = 0;
3564         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3565                 count++;
3566         seq_printf(m, "  nodes: %d\n", count);
3567         count = 0;
3568         strong = 0;
3569         weak = 0;
3570         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3571                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3572                                                   rb_node_desc);
3573                 count++;
3574                 strong += ref->strong;
3575                 weak += ref->weak;
3576         }
3577         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3578
3579         count = 0;
3580         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3581                 count++;
3582         seq_printf(m, "  buffers: %d\n", count);
3583
3584         count = 0;
3585         list_for_each_entry(w, &proc->todo, entry) {
3586                 switch (w->type) {
3587                 case BINDER_WORK_TRANSACTION:
3588                         count++;
3589                         break;
3590                 default:
3591                         break;
3592                 }
3593         }
3594         seq_printf(m, "  pending transactions: %d\n", count);
3595
3596         print_binder_stats(m, "  ", &proc->stats);
3597 }
3598
3599
3600 static int binder_state_show(struct seq_file *m, void *unused)
3601 {
3602         struct binder_proc *proc;
3603         struct binder_node *node;
3604         int do_lock = !binder_debug_no_lock;
3605
3606         if (do_lock)
3607                 binder_lock(__func__);
3608
3609         seq_puts(m, "binder state:\n");
3610
3611         if (!hlist_empty(&binder_dead_nodes))
3612                 seq_puts(m, "dead nodes:\n");
3613         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3614                 print_binder_node(m, node);
3615
3616         hlist_for_each_entry(proc, &binder_procs, proc_node)
3617                 print_binder_proc(m, proc, 1);
3618         if (do_lock)
3619                 binder_unlock(__func__);
3620         return 0;
3621 }
3622
3623 static int binder_stats_show(struct seq_file *m, void *unused)
3624 {
3625         struct binder_proc *proc;
3626         int do_lock = !binder_debug_no_lock;
3627
3628         if (do_lock)
3629                 binder_lock(__func__);
3630
3631         seq_puts(m, "binder stats:\n");
3632
3633         print_binder_stats(m, "", &binder_stats);
3634
3635         hlist_for_each_entry(proc, &binder_procs, proc_node)
3636                 print_binder_proc_stats(m, proc);
3637         if (do_lock)
3638                 binder_unlock(__func__);
3639         return 0;
3640 }
3641
3642 static int binder_transactions_show(struct seq_file *m, void *unused)
3643 {
3644         struct binder_proc *proc;
3645         int do_lock = !binder_debug_no_lock;
3646
3647         if (do_lock)
3648                 binder_lock(__func__);
3649
3650         seq_puts(m, "binder transactions:\n");
3651         hlist_for_each_entry(proc, &binder_procs, proc_node)
3652                 print_binder_proc(m, proc, 0);
3653         if (do_lock)
3654                 binder_unlock(__func__);
3655         return 0;
3656 }
3657
3658 static int binder_proc_show(struct seq_file *m, void *unused)
3659 {
3660         struct binder_proc *proc = m->private;
3661         int do_lock = !binder_debug_no_lock;
3662
3663         if (do_lock)
3664                 binder_lock(__func__);
3665         seq_puts(m, "binder proc state:\n");
3666         print_binder_proc(m, proc, 1);
3667         if (do_lock)
3668                 binder_unlock(__func__);
3669         return 0;
3670 }
3671
3672 static void print_binder_transaction_log_entry(struct seq_file *m,
3673                                         struct binder_transaction_log_entry *e)
3674 {
3675         seq_printf(m,
3676                    "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3677                    e->debug_id, (e->call_type == 2) ? "reply" :
3678                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3679                    e->from_thread, e->to_proc, e->to_thread, e->to_node,
3680                    e->target_handle, e->data_size, e->offsets_size);
3681 }
3682
3683 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3684 {
3685         struct binder_transaction_log *log = m->private;
3686         int i;
3687
3688         if (log->full) {
3689                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3690                         print_binder_transaction_log_entry(m, &log->entry[i]);
3691         }
3692         for (i = 0; i < log->next; i++)
3693                 print_binder_transaction_log_entry(m, &log->entry[i]);
3694         return 0;
3695 }
3696
3697 static const struct file_operations binder_fops = {
3698         .owner = THIS_MODULE,
3699         .poll = binder_poll,
3700         .unlocked_ioctl = binder_ioctl,
3701         .compat_ioctl = binder_ioctl,
3702         .mmap = binder_mmap,
3703         .open = binder_open,
3704         .flush = binder_flush,
3705         .release = binder_release,
3706 };
3707
3708 static struct miscdevice binder_miscdev = {
3709         .minor = MISC_DYNAMIC_MINOR,
3710         .name = "binder",
3711         .fops = &binder_fops
3712 };
3713
3714 BINDER_DEBUG_ENTRY(state);
3715 BINDER_DEBUG_ENTRY(stats);
3716 BINDER_DEBUG_ENTRY(transactions);
3717 BINDER_DEBUG_ENTRY(transaction_log);
3718
3719 static int __init binder_init(void)
3720 {
3721         int ret;
3722
3723         binder_deferred_workqueue = create_singlethread_workqueue("binder");
3724         if (!binder_deferred_workqueue)
3725                 return -ENOMEM;
3726
3727         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3728         if (binder_debugfs_dir_entry_root)
3729                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3730                                                  binder_debugfs_dir_entry_root);
3731         ret = misc_register(&binder_miscdev);
3732         if (binder_debugfs_dir_entry_root) {
3733                 debugfs_create_file("state",
3734                                     S_IRUGO,
3735                                     binder_debugfs_dir_entry_root,
3736                                     NULL,
3737                                     &binder_state_fops);
3738                 debugfs_create_file("stats",
3739                                     S_IRUGO,
3740                                     binder_debugfs_dir_entry_root,
3741                                     NULL,
3742                                     &binder_stats_fops);
3743                 debugfs_create_file("transactions",
3744                                     S_IRUGO,
3745                                     binder_debugfs_dir_entry_root,
3746                                     NULL,
3747                                     &binder_transactions_fops);
3748                 debugfs_create_file("transaction_log",
3749                                     S_IRUGO,
3750                                     binder_debugfs_dir_entry_root,
3751                                     &binder_transaction_log,
3752                                     &binder_transaction_log_fops);
3753                 debugfs_create_file("failed_transaction_log",
3754                                     S_IRUGO,
3755                                     binder_debugfs_dir_entry_root,
3756                                     &binder_transaction_log_failed,
3757                                     &binder_transaction_log_fops);
3758         }
3759         return ret;
3760 }
3761
3762 device_initcall(binder_init);
3763
3764 #define CREATE_TRACE_POINTS
3765 #include "binder_trace.h"
3766
3767 MODULE_LICENSE("GPL v2");