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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PERF_TARGET_H
3 #define _PERF_TARGET_H
4 
5 #include <stdbool.h>
6 #include <sys/types.h>
7 
8 struct target {
9 	const char   *pid;
10 	const char   *tid;
11 	const char   *cpu_list;
12 	const char   *uid_str;
13 	const char   *bpf_str;
14 	uid_t	     uid;
15 	bool	     system_wide;
16 	bool	     uses_mmap;
17 	bool	     default_per_cpu;
18 	bool	     per_thread;
19 	bool	     use_bpf;
20 	int	     initial_delay;
21 	const char   *attr_map;
22 };
23 
24 enum target_errno {
25 	TARGET_ERRNO__SUCCESS		= 0,
26 
27 	/*
28 	 * Choose an arbitrary negative big number not to clash with standard
29 	 * errno since SUS requires the errno has distinct positive values.
30 	 * See 'Issue 6' in the link below.
31 	 *
32 	 * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
33 	 */
34 	__TARGET_ERRNO__START		= -10000,
35 
36 	/* for target__validate() */
37 	TARGET_ERRNO__PID_OVERRIDE_CPU	= __TARGET_ERRNO__START,
38 	TARGET_ERRNO__PID_OVERRIDE_UID,
39 	TARGET_ERRNO__UID_OVERRIDE_CPU,
40 	TARGET_ERRNO__PID_OVERRIDE_SYSTEM,
41 	TARGET_ERRNO__UID_OVERRIDE_SYSTEM,
42 	TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD,
43 	TARGET_ERRNO__BPF_OVERRIDE_CPU,
44 	TARGET_ERRNO__BPF_OVERRIDE_PID,
45 	TARGET_ERRNO__BPF_OVERRIDE_UID,
46 	TARGET_ERRNO__BPF_OVERRIDE_THREAD,
47 
48 	/* for target__parse_uid() */
49 	TARGET_ERRNO__INVALID_UID,
50 	TARGET_ERRNO__USER_NOT_FOUND,
51 
52 	__TARGET_ERRNO__END,
53 };
54 
55 enum target_errno target__validate(struct target *target);
56 enum target_errno target__parse_uid(struct target *target);
57 
58 int target__strerror(struct target *target, int errnum, char *buf, size_t buflen);
59 
target__has_task(struct target * target)60 static inline bool target__has_task(struct target *target)
61 {
62 	return target->tid || target->pid || target->uid_str;
63 }
64 
target__has_cpu(struct target * target)65 static inline bool target__has_cpu(struct target *target)
66 {
67 	return target->system_wide || target->cpu_list;
68 }
69 
target__none(struct target * target)70 static inline bool target__none(struct target *target)
71 {
72 	return !target__has_task(target) && !target__has_cpu(target);
73 }
74 
target__enable_on_exec(struct target * target)75 static inline bool target__enable_on_exec(struct target *target)
76 {
77 	/*
78 	 * Normally enable_on_exec should be set if:
79 	 *  1) The tracee process is forked (not attaching to existed task or cpu).
80 	 *  2) And initial_delay is not configured.
81 	 * Otherwise, we enable tracee events manually.
82 	 */
83 	return target__none(target) && !target->initial_delay;
84 }
85 
target__has_per_thread(struct target * target)86 static inline bool target__has_per_thread(struct target *target)
87 {
88 	return target->system_wide && target->per_thread;
89 }
90 
target__uses_dummy_map(struct target * target)91 static inline bool target__uses_dummy_map(struct target *target)
92 {
93 	bool use_dummy = false;
94 
95 	if (target->default_per_cpu)
96 		use_dummy = target->per_thread ? true : false;
97 	else if (target__has_task(target) ||
98 	         (!target__has_cpu(target) && !target->uses_mmap))
99 		use_dummy = true;
100 	else if (target__has_per_thread(target))
101 		use_dummy = true;
102 
103 	return use_dummy;
104 }
105 
106 #endif /* _PERF_TARGET_H */
107