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TOMOYO Linux Cross Reference
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 bpf_object;
 47 struct parse_events_term;
 48 #define PERF_BPF_PROBE_GROUP "perf_bpf_probe"
 49 
 50 typedef int (*bpf_prog_iter_callback_t)(const char *group, const char *event,
 51                                         int fd, void *arg);
 52 
 53 #ifdef HAVE_LIBBPF_SUPPORT
 54 struct bpf_object *bpf__prepare_load(const char *filename, bool source);
 55 int bpf__strerror_prepare_load(const char *filename, bool source,
 56                                int err, char *buf, size_t size);
 57 
 58 struct bpf_object *bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz,
 59                                             const char *name);
 60 
 61 void bpf__clear(void);
 62 
 63 int bpf__probe(struct bpf_object *obj);
 64 int bpf__unprobe(struct bpf_object *obj);
 65 int bpf__strerror_probe(struct bpf_object *obj, int err,
 66                         char *buf, size_t size);
 67 
 68 int bpf__load(struct bpf_object *obj);
 69 int bpf__strerror_load(struct bpf_object *obj, int err,
 70                        char *buf, size_t size);
 71 int bpf__foreach_event(struct bpf_object *obj,
 72                        bpf_prog_iter_callback_t func, void *arg);
 73 
 74 int bpf__config_obj(struct bpf_object *obj, struct parse_events_term *term,
 75                     struct perf_evlist *evlist, int *error_pos);
 76 int bpf__strerror_config_obj(struct bpf_object *obj,
 77                              struct parse_events_term *term,
 78                              struct perf_evlist *evlist,
 79                              int *error_pos, int err, char *buf,
 80                              size_t size);
 81 int bpf__apply_obj_config(void);
 82 int bpf__strerror_apply_obj_config(int err, char *buf, size_t size);
 83 
 84 int bpf__setup_stdout(struct perf_evlist *evlist);
 85 int bpf__strerror_setup_stdout(struct perf_evlist *evlist, int err,
 86                                char *buf, size_t size);
 87 
 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 int
142 __bpf_strerror(char *buf, size_t size)
143 {
144         if (!size)
145                 return 0;
146         strncpy(buf,
147                 "ERROR: eBPF object loading is disabled during compiling.\n",
148                 size);
149         buf[size - 1] = '\0';
150         return 0;
151 }
152 
153 static inline
154 int bpf__strerror_prepare_load(const char *filename __maybe_unused,
155                                bool source __maybe_unused,
156                                int err __maybe_unused,
157                                char *buf, size_t size)
158 {
159         return __bpf_strerror(buf, size);
160 }
161 
162 static inline int
163 bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
164                     int err __maybe_unused,
165                     char *buf, size_t size)
166 {
167         return __bpf_strerror(buf, size);
168 }
169 
170 static inline int bpf__strerror_load(struct bpf_object *obj __maybe_unused,
171                                      int err __maybe_unused,
172                                      char *buf, size_t size)
173 {
174         return __bpf_strerror(buf, size);
175 }
176 
177 static inline int
178 bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
179                          struct parse_events_term *term __maybe_unused,
180                          struct perf_evlist *evlist __maybe_unused,
181                          int *error_pos __maybe_unused,
182                          int err __maybe_unused,
183                          char *buf, size_t size)
184 {
185         return __bpf_strerror(buf, size);
186 }
187 
188 static inline int
189 bpf__strerror_apply_obj_config(int err __maybe_unused,
190                                char *buf, size_t size)
191 {
192         return __bpf_strerror(buf, size);
193 }
194 
195 static inline int
196 bpf__strerror_setup_stdout(struct perf_evlist *evlist __maybe_unused,
197                            int err __maybe_unused, char *buf,
198                            size_t size)
199 {
200         return __bpf_strerror(buf, size);
201 }
202 #endif
203 #endif
204 

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