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Linux/tools/perf/util/bpf-loader.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
  4  * Copyright (C) 2015, Huawei Inc.
  5  */
  6 #ifndef __BPF_LOADER_H
  7 #define __BPF_LOADER_H
  8 
  9 #include <linux/compiler.h>
 10 #include <linux/err.h>
 11 #include <string.h>
 12 #include <bpf/libbpf.h>
 13 #include "probe-event.h"
 14 #include "evlist.h"
 15 #include "debug.h"
 16 
 17 enum bpf_loader_errno {
 18         __BPF_LOADER_ERRNO__START = __LIBBPF_ERRNO__START - 100,
 19         /* Invalid config string */
 20         BPF_LOADER_ERRNO__CONFIG = __BPF_LOADER_ERRNO__START,
 21         BPF_LOADER_ERRNO__GROUP,        /* Invalid group name */
 22         BPF_LOADER_ERRNO__EVENTNAME,    /* Event name is missing */
 23         BPF_LOADER_ERRNO__INTERNAL,     /* BPF loader internal error */
 24         BPF_LOADER_ERRNO__COMPILE,      /* Error when compiling BPF scriptlet */
 25         BPF_LOADER_ERRNO__PROGCONF_TERM,/* Invalid program config term in config string */
 26         BPF_LOADER_ERRNO__PROLOGUE,     /* Failed to generate prologue */
 27         BPF_LOADER_ERRNO__PROLOGUE2BIG, /* Prologue too big for program */
 28         BPF_LOADER_ERRNO__PROLOGUEOOB,  /* Offset out of bound for prologue */
 29         BPF_LOADER_ERRNO__OBJCONF_OPT,  /* Invalid object config option */
 30         BPF_LOADER_ERRNO__OBJCONF_CONF, /* Config value not set (lost '=')) */
 31         BPF_LOADER_ERRNO__OBJCONF_MAP_OPT,      /* Invalid object map config option */
 32         BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST, /* Target map not exist */
 33         BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE,    /* Incorrect value type for map */
 34         BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,     /* Incorrect map type */
 35         BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE,  /* Incorrect map key size */
 36         BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE,/* Incorrect map value size */
 37         BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT,    /* Event not found for map setting */
 38         BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE,  /* Invalid map size for event setting */
 39         BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,   /* Event dimension too large */
 40         BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,   /* Doesn't support inherit event */
 41         BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,  /* Wrong event type for map */
 42         BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG,  /* Index too large */
 43         __BPF_LOADER_ERRNO__END,
 44 };
 45 
 46 struct perf_evsel;
 47 struct bpf_object;
 48 struct parse_events_term;
 49 #define PERF_BPF_PROBE_GROUP "perf_bpf_probe"
 50 
 51 typedef int (*bpf_prog_iter_callback_t)(const char *group, const char *event,
 52                                         int fd, void *arg);
 53 
 54 #ifdef HAVE_LIBBPF_SUPPORT
 55 struct bpf_object *bpf__prepare_load(const char *filename, bool source);
 56 int bpf__strerror_prepare_load(const char *filename, bool source,
 57                                int err, char *buf, size_t size);
 58 
 59 struct bpf_object *bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz,
 60                                             const char *name);
 61 
 62 void bpf__clear(void);
 63 
 64 int bpf__probe(struct bpf_object *obj);
 65 int bpf__unprobe(struct bpf_object *obj);
 66 int bpf__strerror_probe(struct bpf_object *obj, int err,
 67                         char *buf, size_t size);
 68 
 69 int bpf__load(struct bpf_object *obj);
 70 int bpf__strerror_load(struct bpf_object *obj, int err,
 71                        char *buf, size_t size);
 72 int bpf__foreach_event(struct bpf_object *obj,
 73                        bpf_prog_iter_callback_t func, void *arg);
 74 
 75 int bpf__config_obj(struct bpf_object *obj, struct parse_events_term *term,
 76                     struct perf_evlist *evlist, int *error_pos);
 77 int bpf__strerror_config_obj(struct bpf_object *obj,
 78                              struct parse_events_term *term,
 79                              struct perf_evlist *evlist,
 80                              int *error_pos, int err, char *buf,
 81                              size_t size);
 82 int bpf__apply_obj_config(void);
 83 int bpf__strerror_apply_obj_config(int err, char *buf, size_t size);
 84 
 85 int bpf__setup_stdout(struct perf_evlist *evlist);
 86 struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const char *name);
 87 int bpf__strerror_setup_output_event(struct perf_evlist *evlist, int err, char *buf, size_t size);
 88 #else
 89 #include <errno.h>
 90 
 91 static inline struct bpf_object *
 92 bpf__prepare_load(const char *filename __maybe_unused,
 93                   bool source __maybe_unused)
 94 {
 95         pr_debug("ERROR: eBPF object loading is disabled during compiling.\n");
 96         return ERR_PTR(-ENOTSUP);
 97 }
 98 
 99 static inline struct bpf_object *
100 bpf__prepare_load_buffer(void *obj_buf __maybe_unused,
101                                            size_t obj_buf_sz __maybe_unused)
102 {
103         return ERR_PTR(-ENOTSUP);
104 }
105 
106 static inline void bpf__clear(void) { }
107 
108 static inline int bpf__probe(struct bpf_object *obj __maybe_unused) { return 0;}
109 static inline int bpf__unprobe(struct bpf_object *obj __maybe_unused) { return 0;}
110 static inline int bpf__load(struct bpf_object *obj __maybe_unused) { return 0; }
111 
112 static inline int
113 bpf__foreach_event(struct bpf_object *obj __maybe_unused,
114                    bpf_prog_iter_callback_t func __maybe_unused,
115                    void *arg __maybe_unused)
116 {
117         return 0;
118 }
119 
120 static inline int
121 bpf__config_obj(struct bpf_object *obj __maybe_unused,
122                 struct parse_events_term *term __maybe_unused,
123                 struct perf_evlist *evlist __maybe_unused,
124                 int *error_pos __maybe_unused)
125 {
126         return 0;
127 }
128 
129 static inline int
130 bpf__apply_obj_config(void)
131 {
132         return 0;
133 }
134 
135 static inline int
136 bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
137 {
138         return 0;
139 }
140 
141 static inline struct perf_evsel *
142 bpf__setup_output_event(struct perf_evlist *evlist __maybe_unused, const char *name __maybe_unused)
143 {
144         return NULL;
145 }
146 
147 static inline int
148 __bpf_strerror(char *buf, size_t size)
149 {
150         if (!size)
151                 return 0;
152         strncpy(buf,
153                 "ERROR: eBPF object loading is disabled during compiling.\n",
154                 size);
155         buf[size - 1] = '\0';
156         return 0;
157 }
158 
159 static inline
160 int bpf__strerror_prepare_load(const char *filename __maybe_unused,
161                                bool source __maybe_unused,
162                                int err __maybe_unused,
163                                char *buf, size_t size)
164 {
165         return __bpf_strerror(buf, size);
166 }
167 
168 static inline int
169 bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
170                     int err __maybe_unused,
171                     char *buf, size_t size)
172 {
173         return __bpf_strerror(buf, size);
174 }
175 
176 static inline int bpf__strerror_load(struct bpf_object *obj __maybe_unused,
177                                      int err __maybe_unused,
178                                      char *buf, size_t size)
179 {
180         return __bpf_strerror(buf, size);
181 }
182 
183 static inline int
184 bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
185                          struct parse_events_term *term __maybe_unused,
186                          struct perf_evlist *evlist __maybe_unused,
187                          int *error_pos __maybe_unused,
188                          int err __maybe_unused,
189                          char *buf, size_t size)
190 {
191         return __bpf_strerror(buf, size);
192 }
193 
194 static inline int
195 bpf__strerror_apply_obj_config(int err __maybe_unused,
196                                char *buf, size_t size)
197 {
198         return __bpf_strerror(buf, size);
199 }
200 
201 static inline int
202 bpf__strerror_setup_output_event(struct perf_evlist *evlist __maybe_unused,
203                                  int err __maybe_unused, char *buf, size_t size)
204 {
205         return __bpf_strerror(buf, size);
206 }
207 
208 #endif
209 
210 static inline int bpf__strerror_setup_stdout(struct perf_evlist *evlist, int err, char *buf, size_t size)
211 {
212         return bpf__strerror_setup_output_event(evlist, err, buf, size);
213 }
214 #endif
215 

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