drivers/android/binder_internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef _LINUX_BINDER_INTERNAL_H
   4 #define _LINUX_BINDER_INTERNAL_H
   5
   6 #include <linux/export.h>
   7 #include <linux/fs.h>
   8 #include <linux/list.h>
   9 #include <linux/miscdevice.h>
  10 #include <linux/mutex.h>
  11 #include <linux/refcount.h>
  12 #include <linux/stddef.h>
  13 #include <linux/types.h>
  14 #include <linux/uidgid.h>
  15
  16 struct binder_context {
  17         struct binder_node *binder_context_mgr_node;
  18         struct mutex context_mgr_node_lock;
  19         kuid_t binder_context_mgr_uid;
  20         const char *name;
  21 };
  22
  23 /**
  24  * struct binder_device - information about a binder device node
  25  * @hlist:          list of binder devices (only used for devices requested via
  26  *                  CONFIG_ANDROID_BINDER_DEVICES)
  27  * @miscdev:        information about a binder character device node
  28  * @context:        binder context information
  29  * @binderfs_inode: This is the inode of the root dentry of the super block
  30  *                  belonging to a binderfs mount.
  31  */
  32 struct binder_device {
  33         struct hlist_node hlist;
  34         struct miscdevice miscdev;
  35         struct binder_context context;
  36         struct inode *binderfs_inode;
  37         refcount_t ref;
  38 };
  39
  40 /**
  41  * binderfs_mount_opts - mount options for binderfs
  42  * @max: maximum number of allocatable binderfs binder devices
  43  * @stats_mode: enable binder stats in binderfs.
  44  */
  45 struct binderfs_mount_opts {
  46         int max;
  47         int stats_mode;
  48 };
  49
  50 /**
  51  * binderfs_info - information about a binderfs mount
  52  * @ipc_ns:         The ipc namespace the binderfs mount belongs to.
  53  * @control_dentry: This records the dentry of this binderfs mount
  54  *                  binder-control device.
  55  * @root_uid:       uid that needs to be used when a new binder device is
  56  *                  created.
  57  * @root_gid:       gid that needs to be used when a new binder device is
  58  *                  created.
  59  * @mount_opts:     The mount options in use.
  60  * @device_count:   The current number of allocated binder devices.
  61  * @proc_log_dir:   Pointer to the directory dentry containing process-specific
  62  *                  logs.
  63  */
  64 struct binderfs_info {
  65         struct ipc_namespace *ipc_ns;
  66         struct dentry *control_dentry;
  67         kuid_t root_uid;
  68         kgid_t root_gid;
  69         struct binderfs_mount_opts mount_opts;
  70         int device_count;
  71         struct dentry *proc_log_dir;
  72 };
  73
  74 extern const struct file_operations binder_fops;
  75
  76 extern char *binder_devices_param;
  77
  78 #ifdef CONFIG_ANDROID_BINDERFS
  79 extern bool is_binderfs_device(const struct inode *inode);
  80 extern struct dentry *binderfs_create_file(struct dentry *dir, const char *name,
  81                                            const struct file_operations *fops,
  82                                            void *data);
  83 extern void binderfs_remove_file(struct dentry *dentry);
  84 #else
  85 static inline bool is_binderfs_device(const struct inode *inode)
  86 {
  87         return false;
  88 }
  89 static inline struct dentry *binderfs_create_file(struct dentry *dir,
  90                                            const char *name,
  91                                            const struct file_operations *fops,
  92                                            void *data)
  93 {
  94         return NULL;
  95 }
  96 static inline void binderfs_remove_file(struct dentry *dentry) {}
  97 #endif
  98
  99 #ifdef CONFIG_ANDROID_BINDERFS
 100 extern int __init init_binderfs(void);
 101 #else
 102 static inline int __init init_binderfs(void)
 103 {
 104         return 0;
 105 }
 106 #endif
 107
 108 int binder_stats_show(struct seq_file *m, void *unused);
 109 DEFINE_SHOW_ATTRIBUTE(binder_stats);
 110
 111 int binder_state_show(struct seq_file *m, void *unused);
 112 DEFINE_SHOW_ATTRIBUTE(binder_state);
 113
 114 int binder_transactions_show(struct seq_file *m, void *unused);
 115 DEFINE_SHOW_ATTRIBUTE(binder_transactions);
 116
 117 int binder_transaction_log_show(struct seq_file *m, void *unused);
 118 DEFINE_SHOW_ATTRIBUTE(binder_transaction_log);
 119
 120 struct binder_transaction_log_entry {
 121         int debug_id;
 122         int debug_id_done;
 123         int call_type;
 124         int from_proc;
 125         int from_thread;
 126         int target_handle;
 127         int to_proc;
 128         int to_thread;
 129         int to_node;
 130         int data_size;
 131         int offsets_size;
 132         int return_error_line;
 133         uint32_t return_error;
 134         uint32_t return_error_param;
 135         char context_name[BINDERFS_MAX_NAME + 1];
 136 };
 137
 138 struct binder_transaction_log {
 139         atomic_t cur;
 140         bool full;
 141         struct binder_transaction_log_entry entry[32];
 142 };
 143
 144 extern struct binder_transaction_log binder_transaction_log;
 145 extern struct binder_transaction_log binder_transaction_log_failed;
 146 #endif /* _LINUX_BINDER_INTERNAL_H */