| 1 | #ifndef _LTTNG_TRACEPOINT_H |
| 2 | #define _LTTNG_TRACEPOINT_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | * |
| 7 | * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED |
| 8 | * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. |
| 9 | * |
| 10 | * Permission is hereby granted to use or copy this program |
| 11 | * for any purpose, provided the above notices are retained on all copies. |
| 12 | * Permission to modify the code and to distribute modified code is granted, |
| 13 | * provided the above notices are retained, and a notice that the code was |
| 14 | * modified is included with the above copyright notice. |
| 15 | */ |
| 16 | |
| 17 | #include <lttng/tracepoint-types.h> |
| 18 | #include <lttng/tracepoint-rcu.h> |
| 19 | #include <urcu/compiler.h> |
| 20 | #include <dlfcn.h> /* for dlopen */ |
| 21 | #include <string.h> /* for memset */ |
| 22 | #include <assert.h> |
| 23 | #include <lttng/ust-config.h> /* for sdt */ |
| 24 | |
| 25 | #ifdef LTTNG_UST_HAVE_SDT_INTEGRATION |
| 26 | #define SDT_USE_VARIADIC |
| 27 | #include <sys/sdt.h> |
| 28 | #else |
| 29 | #define STAP_PROBEV(...) |
| 30 | #endif |
| 31 | |
| 32 | #ifdef __cplusplus |
| 33 | extern "C" { |
| 34 | #endif |
| 35 | |
| 36 | #define tracepoint(provider, name, ...) \ |
| 37 | do { \ |
| 38 | STAP_PROBEV(provider, name ## __VA_ARGS__); \ |
| 39 | if (caa_unlikely(__tracepoint_##provider##___##name.state)) \ |
| 40 | __tracepoint_cb_##provider##___##name(__VA_ARGS__); \ |
| 41 | } while (0) |
| 42 | |
| 43 | #define TP_ARGS(...) __VA_ARGS__ |
| 44 | |
| 45 | /* |
| 46 | * TP_ARGS takes tuples of type, argument separated by a comma. |
| 47 | * It can take up to 10 tuples (which means that less than 10 tuples is |
| 48 | * fine too). |
| 49 | * Each tuple is also separated by a comma. |
| 50 | */ |
| 51 | #define __TP_COMBINE_TOKENS(_tokena, _tokenb) \ |
| 52 | _tokena##_tokenb |
| 53 | #define _TP_COMBINE_TOKENS(_tokena, _tokenb) \ |
| 54 | __TP_COMBINE_TOKENS(_tokena, _tokenb) |
| 55 | #define __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \ |
| 56 | _tokena##_tokenb##_tokenc |
| 57 | #define _TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \ |
| 58 | __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) |
| 59 | #define __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \ |
| 60 | _tokena##_tokenb##_tokenc##_tokend |
| 61 | #define _TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \ |
| 62 | __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) |
| 63 | |
| 64 | /* _TP_EXVAR* extract the var names. */ |
| 65 | #define _TP_EXVAR0() |
| 66 | #define _TP_EXVAR2(a,b) b |
| 67 | #define _TP_EXVAR4(a,b,c,d) b,d |
| 68 | #define _TP_EXVAR6(a,b,c,d,e,f) b,d,f |
| 69 | #define _TP_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h |
| 70 | #define _TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j |
| 71 | #define _TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l |
| 72 | #define _TP_EXVAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) b,d,f,h,j,l,n |
| 73 | #define _TP_EXVAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) b,d,f,h,j,l,n,p |
| 74 | #define _TP_EXVAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) b,d,f,h,j,l,n,p,r |
| 75 | #define _TP_EXVAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) b,d,f,h,j,l,n,p,r,t |
| 76 | |
| 77 | #define _TP_EXDATA_VAR0() __tp_data |
| 78 | #define _TP_EXDATA_VAR2(a,b) __tp_data,b |
| 79 | #define _TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d |
| 80 | #define _TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f |
| 81 | #define _TP_EXDATA_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h |
| 82 | #define _TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j |
| 83 | #define _TP_EXDATA_VAR12(a,b,c,d,e,f,g,h,i,j,k,l) __tp_data,b,d,f,h,j,l |
| 84 | #define _TP_EXDATA_VAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) __tp_data,b,d,f,h,j,l,n |
| 85 | #define _TP_EXDATA_VAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) __tp_data,b,d,f,h,j,l,n,p |
| 86 | #define _TP_EXDATA_VAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) __tp_data,b,d,f,h,j,l,n,p,r |
| 87 | #define _TP_EXDATA_VAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) __tp_data,b,d,f,h,j,l,n,p,r,t |
| 88 | |
| 89 | /* _TP_EXPROTO* extract tuples of type, var */ |
| 90 | #define _TP_EXPROTO0() |
| 91 | #define _TP_EXPROTO2(a,b) a b |
| 92 | #define _TP_EXPROTO4(a,b,c,d) a b,c d |
| 93 | #define _TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f |
| 94 | #define _TP_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h |
| 95 | #define _TP_EXPROTO10(a,b,c,d,e,f,g,h,i,j) a b,c d,e f,g h,i j |
| 96 | #define _TP_EXPROTO12(a,b,c,d,e,f,g,h,i,j,k,l) a b,c d,e f,g h,i j,k l |
| 97 | #define _TP_EXPROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) a b,c d,e f,g h,i j,k l,m n |
| 98 | #define _TP_EXPROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) a b,c d,e f,g h,i j,k l,m n,o p |
| 99 | #define _TP_EXPROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) a b,c d,e f,g h,i j,k l,m n,o p,q r |
| 100 | #define _TP_EXPROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) a b,c d,e f,g h,i j,k l,m n,o p,q r,s t |
| 101 | |
| 102 | #define _TP_EXDATA_PROTO0() void *__tp_data |
| 103 | #define _TP_EXDATA_PROTO2(a,b) void *__tp_data,a b |
| 104 | #define _TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d |
| 105 | #define _TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f |
| 106 | #define _TP_EXDATA_PROTO8(a,b,c,d,e,f,g,h) void *__tp_data,a b,c d,e f,g h |
| 107 | #define _TP_EXDATA_PROTO10(a,b,c,d,e,f,g,h,i,j) void *__tp_data,a b,c d,e f,g h,i j |
| 108 | #define _TP_EXDATA_PROTO12(a,b,c,d,e,f,g,h,i,j,k,l) void *__tp_data,a b,c d,e f,g h,i j,k l |
| 109 | #define _TP_EXDATA_PROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) void *__tp_data,a b,c d,e f,g h,i j,k l,m n |
| 110 | #define _TP_EXDATA_PROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p |
| 111 | #define _TP_EXDATA_PROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r |
| 112 | #define _TP_EXDATA_PROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r,s t |
| 113 | |
| 114 | /* Preprocessor trick to count arguments. Inspired from sdt.h. */ |
| 115 | #define _TP_NARGS(...) __TP_NARGS(__VA_ARGS__, 20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0) |
| 116 | #define __TP_NARGS(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20, N, ...) N |
| 117 | #define _TP_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXPROTO, N)(__VA_ARGS__)) |
| 118 | #define _TP_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXVAR, N)(__VA_ARGS__)) |
| 119 | #define _TP_DATA_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_PROTO, N)(__VA_ARGS__)) |
| 120 | #define _TP_DATA_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_VAR, N)(__VA_ARGS__)) |
| 121 | #define _TP_ARGS_PROTO(...) _TP_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
| 122 | #define _TP_ARGS_VAR(...) _TP_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
| 123 | #define _TP_ARGS_DATA_PROTO(...) _TP_DATA_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
| 124 | #define _TP_ARGS_DATA_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
| 125 | #define _TP_PARAMS(...) __VA_ARGS__ |
| 126 | |
| 127 | #define _DECLARE_TRACEPOINT(_provider, _name, ...) \ |
| 128 | extern struct tracepoint __tracepoint_##_provider##___##_name; \ |
| 129 | static inline void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \ |
| 130 | { \ |
| 131 | struct tracepoint_probe *__tp_probe; \ |
| 132 | \ |
| 133 | if (!TP_RCU_LINK_TEST()) \ |
| 134 | return; \ |
| 135 | tp_rcu_read_lock_bp(); \ |
| 136 | __tp_probe = tp_rcu_dereference_bp(__tracepoint_##_provider##___##_name.probes); \ |
| 137 | if (caa_unlikely(!__tp_probe)) \ |
| 138 | goto end; \ |
| 139 | do { \ |
| 140 | void *__tp_cb = __tp_probe->func; \ |
| 141 | void *__tp_data = __tp_probe->data; \ |
| 142 | \ |
| 143 | URCU_FORCE_CAST(void (*)(_TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \ |
| 144 | (_TP_ARGS_DATA_VAR(__VA_ARGS__)); \ |
| 145 | } while ((++__tp_probe)->func); \ |
| 146 | end: \ |
| 147 | tp_rcu_read_unlock_bp(); \ |
| 148 | } \ |
| 149 | static inline void __tracepoint_register_##_provider##___##_name(char *name, \ |
| 150 | void *func, void *data) \ |
| 151 | { \ |
| 152 | __tracepoint_probe_register(name, func, data); \ |
| 153 | } \ |
| 154 | static inline void __tracepoint_unregister_##_provider##___##_name(char *name, \ |
| 155 | void *func, void *data) \ |
| 156 | { \ |
| 157 | __tracepoint_probe_unregister(name, func, data); \ |
| 158 | } |
| 159 | |
| 160 | extern int __tracepoint_probe_register(const char *name, void *func, void *data); |
| 161 | extern int __tracepoint_probe_unregister(const char *name, void *func, void *data); |
| 162 | |
| 163 | /* |
| 164 | * tracepoint dynamic linkage handling (callbacks). Hidden visibility: |
| 165 | * shared across objects in a module/main executable. |
| 166 | */ |
| 167 | struct tracepoint_dlopen { |
| 168 | void *liblttngust_handle; |
| 169 | |
| 170 | int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start, |
| 171 | int tracepoints_count); |
| 172 | int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start); |
| 173 | #ifndef _LGPL_SOURCE |
| 174 | void (*rcu_read_lock_sym_bp)(void); |
| 175 | void (*rcu_read_unlock_sym_bp)(void); |
| 176 | void *(*rcu_dereference_sym_bp)(void *p); |
| 177 | #endif |
| 178 | }; |
| 179 | |
| 180 | extern struct tracepoint_dlopen tracepoint_dlopen; |
| 181 | |
| 182 | #ifdef TRACEPOINT_DEFINE |
| 183 | |
| 184 | /* |
| 185 | * When TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a |
| 186 | * unresolved symbol that requires the provider to be linked in. When |
| 187 | * TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an |
| 188 | * unresolved symbol that depends on having the provider linked in, |
| 189 | * otherwise the linker complains. This deals with use of static |
| 190 | * libraries, ensuring that the linker does not remove the provider |
| 191 | * object from the executable. |
| 192 | */ |
| 193 | #ifdef TRACEPOINT_PROBE_DYNAMIC_LINKAGE |
| 194 | #define _TRACEPOINT_UNDEFINED_REF(provider) |
| 195 | #else /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */ |
| 196 | #define _TRACEPOINT_UNDEFINED_REF(provider) \ |
| 197 | &__tracepoint_provider_##provider, |
| 198 | #endif /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */ |
| 199 | |
| 200 | /* |
| 201 | * Note: to allow PIC code, we need to allow the linker to update the pointers |
| 202 | * in the __tracepoints_ptrs section. |
| 203 | * Therefore, this section is _not_ const (read-only). |
| 204 | */ |
| 205 | #define _DEFINE_TRACEPOINT(provider, name) \ |
| 206 | extern int __tracepoint_provider_##provider; \ |
| 207 | static const char __tp_strtab_##provider##___##name[] \ |
| 208 | __attribute__((section("__tracepoints_strings"))) = \ |
| 209 | #provider ":" #name; \ |
| 210 | struct tracepoint __tracepoint_##provider##___##name \ |
| 211 | __attribute__((section("__tracepoints"))) = \ |
| 212 | { __tp_strtab_##provider##___##name, 0, NULL, _TRACEPOINT_UNDEFINED_REF(provider) }; \ |
| 213 | static struct tracepoint * __tracepoint_ptr_##provider##___##name \ |
| 214 | __attribute__((used, section("__tracepoints_ptrs"))) = \ |
| 215 | &__tracepoint_##provider##___##name; |
| 216 | |
| 217 | /* |
| 218 | * These weak symbols, the constructor, and destructor take care of |
| 219 | * registering only _one_ instance of the tracepoints per shared-ojbect |
| 220 | * (or for the whole main program). |
| 221 | */ |
| 222 | extern struct tracepoint * const __start___tracepoints_ptrs[] |
| 223 | __attribute__((weak, visibility("hidden"))); |
| 224 | extern struct tracepoint * const __stop___tracepoints_ptrs[] |
| 225 | __attribute__((weak, visibility("hidden"))); |
| 226 | int __tracepoint_registered |
| 227 | __attribute__((weak, visibility("hidden"))); |
| 228 | struct tracepoint_dlopen tracepoint_dlopen |
| 229 | __attribute__((weak, visibility("hidden"))); |
| 230 | |
| 231 | static void __attribute__((constructor)) __tracepoints__init(void) |
| 232 | { |
| 233 | if (__tracepoint_registered++) |
| 234 | return; |
| 235 | |
| 236 | tracepoint_dlopen.liblttngust_handle = |
| 237 | dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL); |
| 238 | if (!tracepoint_dlopen.liblttngust_handle) |
| 239 | return; |
| 240 | tracepoint_dlopen.tracepoint_register_lib = |
| 241 | URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int), |
| 242 | dlsym(tracepoint_dlopen.liblttngust_handle, |
| 243 | "tracepoint_register_lib")); |
| 244 | tracepoint_dlopen.tracepoint_unregister_lib = |
| 245 | URCU_FORCE_CAST(int (*)(struct tracepoint * const *), |
| 246 | dlsym(tracepoint_dlopen.liblttngust_handle, |
| 247 | "tracepoint_unregister_lib")); |
| 248 | #ifndef _LGPL_SOURCE |
| 249 | tracepoint_dlopen.rcu_read_lock_sym_bp = |
| 250 | URCU_FORCE_CAST(void (*)(void), |
| 251 | dlsym(tracepoint_dlopen.liblttngust_handle, |
| 252 | "tp_rcu_read_lock_bp")); |
| 253 | tracepoint_dlopen.rcu_read_unlock_sym_bp = |
| 254 | URCU_FORCE_CAST(void (*)(void), |
| 255 | dlsym(tracepoint_dlopen.liblttngust_handle, |
| 256 | "tp_rcu_read_unlock_bp")); |
| 257 | tracepoint_dlopen.rcu_dereference_sym_bp = |
| 258 | URCU_FORCE_CAST(void *(*)(void *p), |
| 259 | dlsym(tracepoint_dlopen.liblttngust_handle, |
| 260 | "tp_rcu_dereference_sym_bp")); |
| 261 | #endif |
| 262 | tracepoint_dlopen.tracepoint_register_lib(__start___tracepoints_ptrs, |
| 263 | __stop___tracepoints_ptrs - |
| 264 | __start___tracepoints_ptrs); |
| 265 | } |
| 266 | |
| 267 | static void __attribute__((destructor)) __tracepoints__destroy(void) |
| 268 | { |
| 269 | int ret; |
| 270 | |
| 271 | if (--__tracepoint_registered) |
| 272 | return; |
| 273 | if (tracepoint_dlopen.tracepoint_unregister_lib) |
| 274 | tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs); |
| 275 | if (tracepoint_dlopen.liblttngust_handle) { |
| 276 | ret = dlclose(tracepoint_dlopen.liblttngust_handle); |
| 277 | assert(!ret); |
| 278 | memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen)); |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | #else /* TRACEPOINT_DEFINE */ |
| 283 | |
| 284 | #define _DEFINE_TRACEPOINT(provider, name) |
| 285 | |
| 286 | #endif /* #else TRACEPOINT_DEFINE */ |
| 287 | |
| 288 | #ifdef __cplusplus |
| 289 | } |
| 290 | #endif |
| 291 | |
| 292 | #endif /* _LTTNG_TRACEPOINT_H */ |
| 293 | |
| 294 | /* The following declarations must be outside re-inclusion protection. */ |
| 295 | |
| 296 | #ifndef TRACEPOINT_EVENT |
| 297 | |
| 298 | /* |
| 299 | * How to use the TRACEPOINT_EVENT macro: |
| 300 | * |
| 301 | * An example: |
| 302 | * |
| 303 | * TRACEPOINT_EVENT(someproject_component, event_name, |
| 304 | * |
| 305 | * * TP_ARGS takes from 0 to 10 "type, field_name" pairs * |
| 306 | * |
| 307 | * TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen, |
| 308 | * long *, arg4, size_t, arg4_len), |
| 309 | * |
| 310 | * * TP_FIELDS describes the event payload layout in the trace * |
| 311 | * |
| 312 | * TP_FIELDS( |
| 313 | * * Integer, printed in base 10 * |
| 314 | * ctf_integer(int, field_a, arg0) |
| 315 | * |
| 316 | * * Integer, printed with 0x base 16 * |
| 317 | * ctf_integer_hex(unsigned long, field_d, arg1) |
| 318 | * |
| 319 | * * Array Sequence, printed as UTF8-encoded array of bytes * |
| 320 | * ctf_array_text(char, field_b, string, FIXED_LEN) |
| 321 | * ctf_sequence_text(char, field_c, string, size_t, strlen) |
| 322 | * |
| 323 | * * String, printed as UTF8-encoded string * |
| 324 | * ctf_string(field_e, string) |
| 325 | * |
| 326 | * * Array sequence of signed integer values * |
| 327 | * ctf_array(long, field_f, arg4, FIXED_LEN4) |
| 328 | * ctf_sequence(long, field_g, arg4, size_t, arg4_len) |
| 329 | * ) |
| 330 | * ) |
| 331 | * |
| 332 | * More detailed explanation: |
| 333 | * |
| 334 | * The name of the tracepoint is expressed as a tuple with the provider |
| 335 | * and name arguments. |
| 336 | * |
| 337 | * The provider and name should be a proper C99 identifier. |
| 338 | * The "provider" and "name" MUST follow these rules to ensure no |
| 339 | * namespace clash occurs: |
| 340 | * |
| 341 | * For projects (applications and libraries) for which an entity |
| 342 | * specific to the project controls the source code and thus its |
| 343 | * tracepoints (typically with a scope larger than a single company): |
| 344 | * |
| 345 | * either: |
| 346 | * project_component, event |
| 347 | * or: |
| 348 | * project, event |
| 349 | * |
| 350 | * Where "project" is the name of the project, |
| 351 | * "component" is the name of the project component (which may |
| 352 | * include several levels of sub-components, e.g. |
| 353 | * ...component_subcomponent_...) where the tracepoint is located |
| 354 | * (optional), |
| 355 | * "event" is the name of the tracepoint event. |
| 356 | * |
| 357 | * For projects issued from a single company wishing to advertise that |
| 358 | * the company controls the source code and thus the tracepoints, the |
| 359 | * "com_" prefix should be used: |
| 360 | * |
| 361 | * either: |
| 362 | * com_company_project_component, event |
| 363 | * or: |
| 364 | * com_company_project, event |
| 365 | * |
| 366 | * Where "company" is the name of the company, |
| 367 | * "project" is the name of the project, |
| 368 | * "component" is the name of the project component (which may |
| 369 | * include several levels of sub-components, e.g. |
| 370 | * ...component_subcomponent_...) where the tracepoint is located |
| 371 | * (optional), |
| 372 | * "event" is the name of the tracepoint event. |
| 373 | * |
| 374 | * the provider:event identifier is limited to 127 characters. |
| 375 | */ |
| 376 | |
| 377 | #define TRACEPOINT_EVENT(provider, name, args, fields) \ |
| 378 | _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \ |
| 379 | _DEFINE_TRACEPOINT(provider, name) |
| 380 | |
| 381 | #define TRACEPOINT_EVENT_CLASS(provider, name, args, fields) |
| 382 | |
| 383 | #define TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \ |
| 384 | _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \ |
| 385 | _DEFINE_TRACEPOINT(provider, name) |
| 386 | |
| 387 | #endif /* #ifndef TRACEPOINT_EVENT */ |
| 388 | |
| 389 | #ifndef TRACEPOINT_LOGLEVEL |
| 390 | |
| 391 | /* |
| 392 | * Tracepoint Loglevels |
| 393 | * |
| 394 | * Typical use of these loglevels: |
| 395 | * |
| 396 | * The loglevels go from 0 to 14. Higher numbers imply the most |
| 397 | * verbosity (higher event throughput expected. |
| 398 | * |
| 399 | * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels |
| 400 | * semantic. Loglevels 7 through 13 offer more fine-grained selection of |
| 401 | * debug information. |
| 402 | * |
| 403 | * TRACE_EMERG 0 |
| 404 | * system is unusable |
| 405 | * |
| 406 | * TRACE_ALERT 1 |
| 407 | * action must be taken immediately |
| 408 | * |
| 409 | * TRACE_CRIT 2 |
| 410 | * critical conditions |
| 411 | * |
| 412 | * TRACE_ERR 3 |
| 413 | * error conditions |
| 414 | * |
| 415 | * TRACE_WARNING 4 |
| 416 | * warning conditions |
| 417 | * |
| 418 | * TRACE_NOTICE 5 |
| 419 | * normal, but significant, condition |
| 420 | * |
| 421 | * TRACE_INFO 6 |
| 422 | * informational message |
| 423 | * |
| 424 | * TRACE_DEBUG_SYSTEM 7 |
| 425 | * debug information with system-level scope (set of programs) |
| 426 | * |
| 427 | * TRACE_DEBUG_PROGRAM 8 |
| 428 | * debug information with program-level scope (set of processes) |
| 429 | * |
| 430 | * TRACE_DEBUG_PROCESS 9 |
| 431 | * debug information with process-level scope (set of modules) |
| 432 | * |
| 433 | * TRACE_DEBUG_MODULE 10 |
| 434 | * debug information with module (executable/library) scope (set of units) |
| 435 | * |
| 436 | * TRACE_DEBUG_UNIT 11 |
| 437 | * debug information with compilation unit scope (set of functions) |
| 438 | * |
| 439 | * TRACE_DEBUG_FUNCTION 12 |
| 440 | * debug information with function-level scope |
| 441 | * |
| 442 | * TRACE_DEBUG_LINE 13 |
| 443 | * debug information with line-level scope (TRACEPOINT_EVENT default) |
| 444 | * |
| 445 | * TRACE_DEBUG 14 |
| 446 | * debug-level message (trace_printf default) |
| 447 | * |
| 448 | * Declare tracepoint loglevels for tracepoints. A TRACEPOINT_EVENT |
| 449 | * should be declared prior to the the TRACEPOINT_LOGLEVEL for a given |
| 450 | * tracepoint name. The first field is the name of the tracepoint, the |
| 451 | * second field is the loglevel name. |
| 452 | * |
| 453 | * TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >, |
| 454 | * < loglevel_name >) |
| 455 | * |
| 456 | * The TRACEPOINT_PROVIDER must be already declared before declaring a |
| 457 | * TRACEPOINT_LOGLEVEL. |
| 458 | */ |
| 459 | |
| 460 | enum { |
| 461 | TRACE_EMERG = 0, |
| 462 | TRACE_ALERT = 1, |
| 463 | TRACE_CRIT = 2, |
| 464 | TRACE_ERR = 3, |
| 465 | TRACE_WARNING = 4, |
| 466 | TRACE_NOTICE = 5, |
| 467 | TRACE_INFO = 6, |
| 468 | TRACE_DEBUG_SYSTEM = 7, |
| 469 | TRACE_DEBUG_PROGRAM = 8, |
| 470 | TRACE_DEBUG_PROCESS = 9, |
| 471 | TRACE_DEBUG_MODULE = 10, |
| 472 | TRACE_DEBUG_UNIT = 11, |
| 473 | TRACE_DEBUG_FUNCTION = 12, |
| 474 | TRACE_DEBUG_LINE = 13, |
| 475 | TRACE_DEBUG = 14, |
| 476 | }; |
| 477 | |
| 478 | #define TRACEPOINT_LOGLEVEL(provider, name, loglevel) |
| 479 | |
| 480 | #endif /* #ifndef TRACEPOINT_LOGLEVEL */ |