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
16struct 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 */
32struct 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 */
45struct 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 */
64struct 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
74extern const struct file_operations binder_fops;
75
76extern char *binder_devices_param;
77
78#ifdef CONFIG_ANDROID_BINDERFS
79extern bool is_binderfs_device(const struct inode *inode);
80extern struct dentry *binderfs_create_file(struct dentry *dir, const char *name,
81					   const struct file_operations *fops,
82					   void *data);
83extern void binderfs_remove_file(struct dentry *dentry);
84#else
85static inline bool is_binderfs_device(const struct inode *inode)
86{
87	return false;
88}
89static 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}
96static inline void binderfs_remove_file(struct dentry *dentry) {}
97#endif
98
99#ifdef CONFIG_ANDROID_BINDERFS
100extern int __init init_binderfs(void);
101#else
102static inline int __init init_binderfs(void)
103{
104	return 0;
105}
106#endif
107
108int binder_stats_show(struct seq_file *m, void *unused);
109DEFINE_SHOW_ATTRIBUTE(binder_stats);
110
111int binder_state_show(struct seq_file *m, void *unused);
112DEFINE_SHOW_ATTRIBUTE(binder_state);
113
114int binder_transactions_show(struct seq_file *m, void *unused);
115DEFINE_SHOW_ATTRIBUTE(binder_transactions);
116
117int binder_transaction_log_show(struct seq_file *m, void *unused);
118DEFINE_SHOW_ATTRIBUTE(binder_transaction_log);
119
120struct 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
138struct binder_transaction_log {
139	atomic_t cur;
140	bool full;
141	struct binder_transaction_log_entry entry[32];
142};
143
144extern struct binder_transaction_log binder_transaction_log;
145extern struct binder_transaction_log binder_transaction_log_failed;
146#endif /* _LINUX_BINDER_INTERNAL_H */
147