1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __TRACE_AGENT_H__
3 #define __TRACE_AGENT_H__
4 #include <pthread.h>
5 #include <stdbool.h>
6 
7 #define MAX_CPUS	256
8 #define PIPE_INIT       (1024*1024)
9 
10 /*
11  * agent_info - structure managing total information of guest agent
12  * @pipe_size:	size of pipe (default 1MB)
13  * @use_stdout:	set to true when o option is added (default false)
14  * @cpus:	total number of CPUs
15  * @ctl_fd:	fd of control path, /dev/virtio-ports/agent-ctl-path
16  * @rw_ti:	structure managing information of read/write threads
17  */
18 struct agent_info {
19 	unsigned long pipe_size;
20 	bool use_stdout;
21 	int cpus;
22 	int ctl_fd;
23 	struct rw_thread_info *rw_ti[MAX_CPUS];
24 };
25 
26 /*
27  * rw_thread_info - structure managing a read/write thread a cpu
28  * @cpu_num:	cpu number operating this read/write thread
29  * @in_fd:	fd of reading trace data path in cpu_num
30  * @out_fd:	fd of writing trace data path in cpu_num
31  * @read_pipe:	fd of read pipe
32  * @write_pipe:	fd of write pipe
33  * @pipe_size:	size of pipe (default 1MB)
34  */
35 struct rw_thread_info {
36 	int cpu_num;
37 	int in_fd;
38 	int out_fd;
39 	int read_pipe;
40 	int write_pipe;
41 	unsigned long pipe_size;
42 };
43 
44 /* use for stopping rw threads */
45 extern bool global_sig_receive;
46 
47 /* use for notification */
48 extern bool global_run_operation;
49 extern pthread_mutex_t mutex_notify;
50 extern pthread_cond_t cond_wakeup;
51 
52 /* for controller of read/write threads */
53 extern int rw_ctl_init(const char *ctl_path);
54 extern void *rw_ctl_loop(int ctl_fd);
55 
56 /* for trace read/write thread */
57 extern void *rw_thread_info_new(void);
58 extern void *rw_thread_init(int cpu, const char *in_path, const char *out_path,
59 			bool stdout_flag, unsigned long pipe_size,
60 			struct rw_thread_info *rw_ti);
61 extern pthread_t rw_thread_run(struct rw_thread_info *rw_ti);
62 
zalloc(size_t size)63 static inline void *zalloc(size_t size)
64 {
65 	return calloc(1, size);
66 }
67 
68 #define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
69 #define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
70 #ifdef DEBUG
71 #define pr_debug(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
72 #else
73 #define pr_debug(format, ...) do {} while (0)
74 #endif
75 
76 #endif /*__TRACE_AGENT_H__*/
77