drivers/staging/android/binder.c

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