xref: /linux/tools/perf/util/bpf_counter.h (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __PERF_BPF_COUNTER_H
3 #define __PERF_BPF_COUNTER_H 1
4 
5 #include <linux/list.h>
6 #include <sys/resource.h>
7 
8 #ifdef HAVE_LIBBPF_SUPPORT
9 #include <bpf/bpf.h>
10 #include <bpf/btf.h>
11 #include <bpf/libbpf.h>
12 #endif
13 
14 struct evsel;
15 struct target;
16 struct bpf_counter;
17 
18 typedef int (*bpf_counter_evsel_op)(struct evsel *evsel);
19 typedef int (*bpf_counter_evsel_target_op)(struct evsel *evsel,
20 					   struct target *target);
21 typedef int (*bpf_counter_evsel_install_pe_op)(struct evsel *evsel,
22 					       int cpu_map_idx,
23 					       int fd);
24 
25 struct bpf_counter_ops {
26 	bpf_counter_evsel_target_op load;
27 	bpf_counter_evsel_op enable;
28 	bpf_counter_evsel_op disable;
29 	bpf_counter_evsel_op read;
30 	bpf_counter_evsel_op destroy;
31 	bpf_counter_evsel_install_pe_op install_pe;
32 };
33 
34 struct bpf_counter {
35 	void *skel;
36 	struct list_head list;
37 };
38 
39 #ifdef HAVE_BPF_SKEL
40 
41 int bpf_counter__load(struct evsel *evsel, struct target *target);
42 int bpf_counter__enable(struct evsel *evsel);
43 int bpf_counter__disable(struct evsel *evsel);
44 int bpf_counter__read(struct evsel *evsel);
45 void bpf_counter__destroy(struct evsel *evsel);
46 int bpf_counter__install_pe(struct evsel *evsel, int cpu_map_idx, int fd);
47 
48 #else /* HAVE_BPF_SKEL */
49 
50 #include <linux/err.h>
51 
bpf_counter__load(struct evsel * evsel __maybe_unused,struct target * target __maybe_unused)52 static inline int bpf_counter__load(struct evsel *evsel __maybe_unused,
53 				    struct target *target __maybe_unused)
54 {
55 	return 0;
56 }
57 
bpf_counter__enable(struct evsel * evsel __maybe_unused)58 static inline int bpf_counter__enable(struct evsel *evsel __maybe_unused)
59 {
60 	return 0;
61 }
62 
bpf_counter__disable(struct evsel * evsel __maybe_unused)63 static inline int bpf_counter__disable(struct evsel *evsel __maybe_unused)
64 {
65 	return 0;
66 }
67 
bpf_counter__read(struct evsel * evsel __maybe_unused)68 static inline int bpf_counter__read(struct evsel *evsel __maybe_unused)
69 {
70 	return -EAGAIN;
71 }
72 
bpf_counter__destroy(struct evsel * evsel __maybe_unused)73 static inline void bpf_counter__destroy(struct evsel *evsel __maybe_unused)
74 {
75 }
76 
bpf_counter__install_pe(struct evsel * evsel __maybe_unused,int cpu __maybe_unused,int fd __maybe_unused)77 static inline int bpf_counter__install_pe(struct evsel *evsel __maybe_unused,
78 					  int cpu __maybe_unused,
79 					  int fd __maybe_unused)
80 {
81 	return 0;
82 }
83 
84 #endif /* HAVE_BPF_SKEL */
85 
set_max_rlimit(void)86 static inline void set_max_rlimit(void)
87 {
88 	struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
89 
90 	setrlimit(RLIMIT_MEMLOCK, &rinf);
91 }
92 
93 #ifdef HAVE_BPF_SKEL
94 
bpf_link_get_id(int fd)95 static inline __u32 bpf_link_get_id(int fd)
96 {
97 	struct bpf_link_info link_info = { .id = 0, };
98 	__u32 link_info_len = sizeof(link_info);
99 
100 	bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
101 	return link_info.id;
102 }
103 
bpf_link_get_prog_id(int fd)104 static inline __u32 bpf_link_get_prog_id(int fd)
105 {
106 	struct bpf_link_info link_info = { .id = 0, };
107 	__u32 link_info_len = sizeof(link_info);
108 
109 	bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
110 	return link_info.prog_id;
111 }
112 
bpf_map_get_id(int fd)113 static inline __u32 bpf_map_get_id(int fd)
114 {
115 	struct bpf_map_info map_info = { .id = 0, };
116 	__u32 map_info_len = sizeof(map_info);
117 
118 	bpf_obj_get_info_by_fd(fd, &map_info, &map_info_len);
119 	return map_info.id;
120 }
121 
122 /* trigger the leader program on a cpu */
bperf_trigger_reading(int prog_fd,int cpu)123 static inline int bperf_trigger_reading(int prog_fd, int cpu)
124 {
125 	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
126 			    .ctx_in = NULL,
127 			    .ctx_size_in = 0,
128 			    .flags = BPF_F_TEST_RUN_ON_CPU,
129 			    .cpu = cpu,
130 			    .retval = 0,
131 		);
132 
133 	return bpf_prog_test_run_opts(prog_fd, &opts);
134 }
135 #endif /* HAVE_BPF_SKEL */
136 
137 #endif /* __PERF_BPF_COUNTER_H */
138