| 1 | #include <lttng.h> |
| 2 | #include <lttng-types.h> |
| 3 | #include <linux/debugfs.h> |
| 4 | #include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
| 5 | #include "../wrapper/ringbuffer/frontend_types.h" |
| 6 | #include "../ltt-events.h" |
| 7 | #include "../ltt-tracer-core.h" |
| 8 | |
| 9 | struct lttng_event_field { |
| 10 | const char *name; |
| 11 | const struct lttng_type type; |
| 12 | }; |
| 13 | |
| 14 | struct lttng_event_desc { |
| 15 | const struct lttng_event_field *fields; |
| 16 | const char *name; |
| 17 | void *probe_callback; |
| 18 | unsigned int nr_fields; |
| 19 | }; |
| 20 | |
| 21 | /* |
| 22 | * Macro declarations used for all stages. |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | * DECLARE_EVENT_CLASS can be used to add a generic function |
| 27 | * handlers for events. That is, if all events have the same |
| 28 | * parameters and just have distinct trace points. |
| 29 | * Each tracepoint can be defined with DEFINE_EVENT and that |
| 30 | * will map the DECLARE_EVENT_CLASS to the tracepoint. |
| 31 | * |
| 32 | * TRACE_EVENT is a one to one mapping between tracepoint and template. |
| 33 | */ |
| 34 | |
| 35 | #undef TRACE_EVENT |
| 36 | #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \ |
| 37 | DECLARE_EVENT_CLASS(name, \ |
| 38 | PARAMS(proto), \ |
| 39 | PARAMS(args), \ |
| 40 | PARAMS(tstruct), \ |
| 41 | PARAMS(assign), \ |
| 42 | PARAMS(print)) \ |
| 43 | DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args)) |
| 44 | |
| 45 | #undef DEFINE_EVENT_PRINT |
| 46 | #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ |
| 47 | DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) |
| 48 | |
| 49 | /* Callbacks are meaningless to LTTng. */ |
| 50 | #undef TRACE_EVENT_FN |
| 51 | #define TRACE_EVENT_FN(name, proto, args, tstruct, \ |
| 52 | assign, print, reg, unreg) \ |
| 53 | TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \ |
| 54 | PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \ |
| 55 | |
| 56 | /* |
| 57 | * Stage 1 of the trace events. |
| 58 | * |
| 59 | * Create event field type metadata section. |
| 60 | * Each event produce an array of fields. |
| 61 | */ |
| 62 | |
| 63 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 64 | |
| 65 | /* Named field types must be defined in lttng-types.h */ |
| 66 | |
| 67 | #undef __field |
| 68 | #define __field(_type, _item) \ |
| 69 | { .name = #_item, .type = { .atype = atype_integer, .name = #_type} }, |
| 70 | |
| 71 | #undef __field_ext |
| 72 | #define __field_ext(_type, _item, _filter_type) __field(_type, _item) |
| 73 | |
| 74 | #undef __array |
| 75 | #define __array(_type, _item, _length) \ |
| 76 | { \ |
| 77 | .name = #_item, \ |
| 78 | .type = { \ |
| 79 | .atype = atype_array, \ |
| 80 | .name = NULL, \ |
| 81 | .u.array.elem_type = #_type, \ |
| 82 | .u.array.length = _length, \ |
| 83 | }, \ |
| 84 | }, |
| 85 | |
| 86 | #undef __dynamic_array |
| 87 | #define __dynamic_array(_type, _item, _length) \ |
| 88 | { \ |
| 89 | .name = #_item, \ |
| 90 | .type = { \ |
| 91 | .atype = atype_sequence, \ |
| 92 | .name = NULL, \ |
| 93 | .u.sequence.elem_type = #_type, \ |
| 94 | .u.sequence.length_type = "u32", \ |
| 95 | }, \ |
| 96 | }, |
| 97 | |
| 98 | #undef __string |
| 99 | #define __string(_item, _src) \ |
| 100 | { \ |
| 101 | .name = #_item, \ |
| 102 | .type = { \ |
| 103 | .atype = atype_string, \ |
| 104 | .name = NULL, \ |
| 105 | .u.string.encoding = lttng_encode_UTF8, \ |
| 106 | }, \ |
| 107 | }, |
| 108 | |
| 109 | #undef TP_STRUCT__entry |
| 110 | #define TP_STRUCT__entry(args...) args /* Only one used in this phase */ |
| 111 | |
| 112 | #undef DECLARE_EVENT_CLASS |
| 113 | #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ |
| 114 | static const struct lttng_event_field __event_fields___##_name[] = { \ |
| 115 | _tstruct \ |
| 116 | }; |
| 117 | |
| 118 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 119 | |
| 120 | /* |
| 121 | * Stage 1.1 of the trace events. |
| 122 | * |
| 123 | * Create probe callback prototypes. |
| 124 | */ |
| 125 | |
| 126 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 127 | |
| 128 | #undef TP_PROTO |
| 129 | #define TP_PROTO(args...) args |
| 130 | |
| 131 | #undef DECLARE_EVENT_CLASS |
| 132 | #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ |
| 133 | static void __event_probe__##_name(void *__data, _proto); |
| 134 | |
| 135 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 136 | |
| 137 | /* |
| 138 | * Stage 2 of the trace events. |
| 139 | * |
| 140 | * Create an array of events. |
| 141 | */ |
| 142 | |
| 143 | /* Named field types must be defined in lttng-types.h */ |
| 144 | |
| 145 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 146 | |
| 147 | #undef DEFINE_EVENT |
| 148 | #define DEFINE_EVENT(_template, _name, _proto, _args) \ |
| 149 | { \ |
| 150 | .fields = __event_fields___##_template, \ |
| 151 | .name = #_name, \ |
| 152 | .probe_callback = (void *) &__event_probe__##_template,\ |
| 153 | .nr_fields = ARRAY_SIZE(__event_fields___##_template), \ |
| 154 | }, |
| 155 | |
| 156 | #define TP_ID1(_token, _system) _token##_system |
| 157 | #define TP_ID(_token, _system) TP_ID1(_token, _system) |
| 158 | |
| 159 | static const struct lttng_event_desc TP_ID(__event_desc___, TRACE_SYSTEM)[] = { |
| 160 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 161 | }; |
| 162 | |
| 163 | #undef TP_ID1 |
| 164 | #undef TP_ID |
| 165 | |
| 166 | /* |
| 167 | * Stage 3 of the trace events. |
| 168 | * |
| 169 | * Create seq file metadata output. |
| 170 | */ |
| 171 | |
| 172 | #define TP_ID1(_token, _system) _token##_system |
| 173 | #define TP_ID(_token, _system) TP_ID1(_token, _system) |
| 174 | |
| 175 | static void *TP_ID(__lttng_seq_start__, TRACE_SYSTEM)(struct seq_file *m, |
| 176 | loff_t *pos) |
| 177 | { |
| 178 | const struct lttng_event_desc *desc = |
| 179 | &TP_ID(__event_desc___, TRACE_SYSTEM)[*pos]; |
| 180 | |
| 181 | if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM) |
| 182 | [ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1]) |
| 183 | return NULL; |
| 184 | return (void *) desc; |
| 185 | } |
| 186 | |
| 187 | static void *TP_ID(__lttng_seq_next__, TRACE_SYSTEM)(struct seq_file *m, |
| 188 | void *p, loff_t *ppos) |
| 189 | { |
| 190 | const struct lttng_event_desc *desc = |
| 191 | &TP_ID(__event_desc___, TRACE_SYSTEM)[++(*ppos)]; |
| 192 | |
| 193 | if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM) |
| 194 | [ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1]) |
| 195 | return NULL; |
| 196 | return (void *) desc; |
| 197 | } |
| 198 | |
| 199 | static void TP_ID(__lttng_seq_stop__, TRACE_SYSTEM)(struct seq_file *m, |
| 200 | void *p) |
| 201 | { |
| 202 | } |
| 203 | |
| 204 | static int TP_ID(__lttng_seq_show__, TRACE_SYSTEM)(struct seq_file *m, |
| 205 | void *p) |
| 206 | { |
| 207 | const struct lttng_event_desc *desc = p; |
| 208 | int i; |
| 209 | |
| 210 | seq_printf(m, "event {\n" |
| 211 | "\tname = %s;\n" |
| 212 | "\tid = UNKNOWN;\n" |
| 213 | "\tstream = UNKNOWN;\n" |
| 214 | "\tfields = {\n", |
| 215 | desc->name); |
| 216 | for (i = 0; i < desc->nr_fields; i++) { |
| 217 | if (desc->fields[i].type.name) /* Named type */ |
| 218 | seq_printf(m, "\t\t%s", |
| 219 | desc->fields[i].type.name); |
| 220 | else /* Nameless type */ |
| 221 | lttng_print_event_type(m, 2, &desc->fields[i].type); |
| 222 | seq_printf(m, " %s;\n", desc->fields[i].name); |
| 223 | } |
| 224 | seq_printf(m, "\t};\n"); |
| 225 | seq_printf(m, "};\n"); |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | static const |
| 230 | struct seq_operations TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM) = { |
| 231 | .start = TP_ID(__lttng_seq_start__, TRACE_SYSTEM), |
| 232 | .next = TP_ID(__lttng_seq_next__, TRACE_SYSTEM), |
| 233 | .stop = TP_ID(__lttng_seq_stop__, TRACE_SYSTEM), |
| 234 | .show = TP_ID(__lttng_seq_show__, TRACE_SYSTEM), |
| 235 | }; |
| 236 | |
| 237 | static int |
| 238 | TP_ID(__lttng_types_open__, TRACE_SYSTEM)(struct inode *inode, struct file *file) |
| 239 | { |
| 240 | return seq_open(file, &TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM)); |
| 241 | } |
| 242 | |
| 243 | static const |
| 244 | struct file_operations TP_ID(__lttng_types_fops__, TRACE_SYSTEM) = { |
| 245 | .open = TP_ID(__lttng_types_open__, TRACE_SYSTEM), |
| 246 | .read = seq_read, |
| 247 | .llseek = seq_lseek, |
| 248 | .release = seq_release_private, |
| 249 | }; |
| 250 | |
| 251 | static struct dentry *TP_ID(__lttng_types_dentry__, TRACE_SYSTEM); |
| 252 | |
| 253 | static int TP_ID(__lttng_types_init__, TRACE_SYSTEM)(void) |
| 254 | { |
| 255 | int ret = 0; |
| 256 | |
| 257 | TP_ID(__lttng_types_dentry__, TRACE_SYSTEM) = |
| 258 | debugfs_create_file("lttng-events-" __stringify(TRACE_SYSTEM), |
| 259 | S_IWUSR, NULL, NULL, |
| 260 | &TP_ID(__lttng_types_fops__, TRACE_SYSTEM)); |
| 261 | if (IS_ERR(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)) |
| 262 | || !TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)) { |
| 263 | printk(KERN_ERR "Error creating LTTng type export file\n"); |
| 264 | ret = -ENOMEM; |
| 265 | goto error; |
| 266 | } |
| 267 | error: |
| 268 | return ret; |
| 269 | } |
| 270 | |
| 271 | static void TP_ID(__lttng_types_exit__, TRACE_SYSTEM)(void) |
| 272 | { |
| 273 | debugfs_remove(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)); |
| 274 | } |
| 275 | |
| 276 | #undef TP_ID1 |
| 277 | #undef TP_ID |
| 278 | |
| 279 | /* |
| 280 | * Stage 4 of the trace events. |
| 281 | * |
| 282 | * Create static inline function that calculates event size. |
| 283 | */ |
| 284 | |
| 285 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 286 | |
| 287 | /* Named field types must be defined in lttng-types.h */ |
| 288 | |
| 289 | #undef __field |
| 290 | #define __field(_type, _item) \ |
| 291 | __event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \ |
| 292 | __event_len += sizeof(_type); |
| 293 | |
| 294 | #undef __field_ext |
| 295 | #define __field_ext(_type, _item, _filter_type) __field(_type, _item) |
| 296 | |
| 297 | #undef __array |
| 298 | #define __array(_type, _item, _length) \ |
| 299 | __event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \ |
| 300 | __event_len += sizeof(_type) * (_length); |
| 301 | |
| 302 | #undef __dynamic_array |
| 303 | #define __dynamic_array(_type, _item, _length) \ |
| 304 | __event_len += lib_ring_buffer_align(__event_len, __alignof__(u32)); \ |
| 305 | __event_len += sizeof(u32); \ |
| 306 | __event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \ |
| 307 | __event_len += sizeof(_type) * (_length); |
| 308 | |
| 309 | #undef __string |
| 310 | #define __string(_item, _src) \ |
| 311 | __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1; |
| 312 | |
| 313 | #undef TP_PROTO |
| 314 | #define TP_PROTO(args...) args |
| 315 | |
| 316 | #undef TP_STRUCT__entry |
| 317 | #define TP_STRUCT__entry(args...) args |
| 318 | |
| 319 | #undef DECLARE_EVENT_CLASS |
| 320 | #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ |
| 321 | static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \ |
| 322 | { \ |
| 323 | size_t __event_len = 0; \ |
| 324 | unsigned int __dynamic_len_idx = 0; \ |
| 325 | \ |
| 326 | if (0) \ |
| 327 | (void) __dynamic_len_idx; /* don't warn if unused */ \ |
| 328 | _tstruct \ |
| 329 | return __event_len; \ |
| 330 | } |
| 331 | |
| 332 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 333 | |
| 334 | |
| 335 | |
| 336 | /* |
| 337 | * Stage 5 of the trace events. |
| 338 | * |
| 339 | * Create static inline function that calculates event payload alignment. |
| 340 | */ |
| 341 | |
| 342 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 343 | |
| 344 | /* Named field types must be defined in lttng-types.h */ |
| 345 | |
| 346 | #undef __field |
| 347 | #define __field(_type, _item) \ |
| 348 | __event_align = max_t(size_t, __event_align, __alignof__(_type)); |
| 349 | |
| 350 | #undef __field_ext |
| 351 | #define __field_ext(_type, _item, _filter_type) __field(_type, _item) |
| 352 | |
| 353 | #undef __array |
| 354 | #define __array(_type, _item, _length) \ |
| 355 | __event_align = max_t(size_t, __event_align, __alignof__(_type)); |
| 356 | |
| 357 | #undef __dynamic_array |
| 358 | #define __dynamic_array(_type, _item, _length) \ |
| 359 | __event_align = max_t(size_t, __event_align, __alignof__(u32)); \ |
| 360 | __event_align = max_t(size_t, __event_align, __alignof__(_type)); |
| 361 | |
| 362 | #undef __string |
| 363 | #define __string(_item, _src) |
| 364 | |
| 365 | #undef TP_PROTO |
| 366 | #define TP_PROTO(args...) args |
| 367 | |
| 368 | #undef TP_STRUCT__entry |
| 369 | #define TP_STRUCT__entry(args...) args |
| 370 | |
| 371 | #undef DECLARE_EVENT_CLASS |
| 372 | #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ |
| 373 | static inline size_t __event_get_align__##_name(_proto) \ |
| 374 | { \ |
| 375 | size_t __event_align = 1; \ |
| 376 | _tstruct \ |
| 377 | return __event_align; \ |
| 378 | } |
| 379 | |
| 380 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 381 | |
| 382 | |
| 383 | /* |
| 384 | * Stage 6 of the trace events. |
| 385 | * |
| 386 | * Create structure declaration that allows the "assign" macros to access the |
| 387 | * field types. |
| 388 | */ |
| 389 | |
| 390 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 391 | |
| 392 | /* Named field types must be defined in lttng-types.h */ |
| 393 | |
| 394 | #undef __field |
| 395 | #define __field(_type, _item) _type _item; |
| 396 | |
| 397 | #undef __field_ext |
| 398 | #define __field_ext(_type, _item, _filter_type) __field(_type, _item) |
| 399 | |
| 400 | #undef __array |
| 401 | #define __array(_type, _item, _length) _type _item; |
| 402 | |
| 403 | #undef __dynamic_array |
| 404 | #define __dynamic_array(_type, _item, _length) _type _item; |
| 405 | |
| 406 | #undef __string |
| 407 | #define __string(_item, _src) char _item; |
| 408 | |
| 409 | #undef TP_STRUCT__entry |
| 410 | #define TP_STRUCT__entry(args...) args |
| 411 | |
| 412 | #undef DECLARE_EVENT_CLASS |
| 413 | #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ |
| 414 | struct __event_typemap__##_name { \ |
| 415 | _tstruct \ |
| 416 | }; |
| 417 | |
| 418 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 419 | |
| 420 | |
| 421 | /* |
| 422 | * Stage 7 of the trace events. |
| 423 | * |
| 424 | * Create the probe function : call even size calculation and write event data |
| 425 | * into the buffer. |
| 426 | * |
| 427 | * We use both the field and assignment macros to write the fields in the order |
| 428 | * defined in the field declaration. The field declarations control the |
| 429 | * execution order, jumping to the appropriate assignment block. |
| 430 | */ |
| 431 | |
| 432 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 433 | |
| 434 | #undef __field |
| 435 | #define __field(_type, _item) \ |
| 436 | goto __assign_##_item; \ |
| 437 | __end_field_##_item: |
| 438 | |
| 439 | #undef __field_ext |
| 440 | #define __field_ext(_type, _item, _filter_type) __field(_type, _item) |
| 441 | |
| 442 | #undef __array |
| 443 | #define __array(_type, _item, _length) \ |
| 444 | goto __assign_##_item; \ |
| 445 | __end_field_##_item: |
| 446 | |
| 447 | #undef __dynamic_array |
| 448 | #define __dynamic_array(_type, _item, _length) \ |
| 449 | goto __assign_##_item##_1; \ |
| 450 | __end_field_##_item##_1: \ |
| 451 | goto __assign_##_item##_2; \ |
| 452 | __end_field_##_item##_2: |
| 453 | |
| 454 | #undef __string |
| 455 | #define __string(_item, _src) \ |
| 456 | goto __assign_##_item; \ |
| 457 | __end_field_##_item: |
| 458 | |
| 459 | /* |
| 460 | * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to |
| 461 | * strcpy(). |
| 462 | */ |
| 463 | #undef tp_assign |
| 464 | #define tp_assign(dest, src) \ |
| 465 | __assign_##dest: \ |
| 466 | { \ |
| 467 | __typeof__(__typemap.dest) __tmp = (src); \ |
| 468 | lib_ring_buffer_align_ctx(&ctx, __alignof__(__tmp)); \ |
| 469 | __chan->ops->event_write(&ctx, &__tmp, sizeof(__tmp)); \ |
| 470 | } \ |
| 471 | goto __end_field_##dest; |
| 472 | |
| 473 | #undef tp_memcpy |
| 474 | #define tp_memcpy(dest, src, len) \ |
| 475 | __assign_##dest: \ |
| 476 | lib_ring_buffer_align_ctx(&ctx, __alignof__(__typemap.dest)); \ |
| 477 | __chan->ops->event_write(&ctx, src, len); \ |
| 478 | goto __end_field_##dest; |
| 479 | |
| 480 | #undef tp_memcpy_dyn |
| 481 | #define tp_memcpy_dyn(dest, src, len) \ |
| 482 | __assign_##dest##_1: \ |
| 483 | { \ |
| 484 | u32 __tmpl = (len); \ |
| 485 | lib_ring_buffer_align_ctx(&ctx, __alignof__(u32)); \ |
| 486 | __chan->ops->event_write(&ctx, &__tmpl, sizeof(u32)); \ |
| 487 | } \ |
| 488 | goto __end_field_##dest##_1; \ |
| 489 | __assign_##dest##_2: \ |
| 490 | lib_ring_buffer_align_ctx(&ctx, __alignof__(__typemap.dest)); \ |
| 491 | __chan->ops->event_write(&ctx, src, len); \ |
| 492 | goto __end_field_##dest##_2; |
| 493 | |
| 494 | #undef tp_strcpy |
| 495 | #define tp_strcpy(dest, src) \ |
| 496 | tp_memcpy(dest, src, __get_dynamic_array_len(dest)) |
| 497 | |
| 498 | /* Named field types must be defined in lttng-types.h */ |
| 499 | |
| 500 | #undef __get_str |
| 501 | #define __get_str(field) field |
| 502 | |
| 503 | #undef __get_dynamic_array |
| 504 | #define __get_dynamic_array(field) field |
| 505 | |
| 506 | /* Beware: this get len actually consumes the len value */ |
| 507 | #undef __get_dynamic_array_len |
| 508 | #define __get_dynamic_array_len(field) __dynamic_len[__dynamic_len_idx++] |
| 509 | |
| 510 | #undef TP_PROTO |
| 511 | #define TP_PROTO(args...) args |
| 512 | |
| 513 | #undef TP_ARGS |
| 514 | #define TP_ARGS(args...) args |
| 515 | |
| 516 | #undef TP_STRUCT__entry |
| 517 | #define TP_STRUCT__entry(args...) args |
| 518 | |
| 519 | #undef TP_fast_assign |
| 520 | #define TP_fast_assign(args...) args |
| 521 | |
| 522 | #undef DECLARE_EVENT_CLASS |
| 523 | #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ |
| 524 | static void __event_probe__##_name(void *__data, _proto) \ |
| 525 | { \ |
| 526 | struct ltt_event *__event = __data; \ |
| 527 | struct ltt_channel *__chan = __event->chan; \ |
| 528 | struct lib_ring_buffer_ctx ctx; \ |
| 529 | size_t __event_len, __event_align; \ |
| 530 | size_t __dynamic_len_idx = 0; \ |
| 531 | size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)]; \ |
| 532 | struct __event_typemap__##_name __typemap; \ |
| 533 | int __ret; \ |
| 534 | \ |
| 535 | if (0) \ |
| 536 | (void) __dynamic_len_idx; /* don't warn if unused */ \ |
| 537 | if (!ACCESS_ONCE(__chan->session->active)) \ |
| 538 | return; \ |
| 539 | __event_len = __event_get_size__##_name(__dynamic_len, _args); \ |
| 540 | __event_align = __event_get_align__##_name(_args); \ |
| 541 | lib_ring_buffer_ctx_init(&ctx, __chan->chan, NULL, __event_len, \ |
| 542 | __event_align, -1); \ |
| 543 | __ret = __chan->ops->event_reserve(&ctx); \ |
| 544 | if (__ret < 0) \ |
| 545 | return; \ |
| 546 | /* Control code (field ordering) */ \ |
| 547 | _tstruct \ |
| 548 | __chan->ops->event_commit(&ctx); \ |
| 549 | return; \ |
| 550 | /* Copy code, steered by control code */ \ |
| 551 | _assign \ |
| 552 | } |
| 553 | |
| 554 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 555 | |
| 556 | /* |
| 557 | * Stage 8 of the trace events. |
| 558 | * |
| 559 | * Register/unregister probes at module load/unload. |
| 560 | */ |
| 561 | |
| 562 | #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ |
| 563 | |
| 564 | #define TP_ID1(_token, _system) _token##_system |
| 565 | #define TP_ID(_token, _system) TP_ID1(_token, _system) |
| 566 | #define module_init_eval1(_token, _system) module_init(_token##_system) |
| 567 | #define module_init_eval(_token, _system) module_init_eval1(_token, _system) |
| 568 | #define module_exit_eval1(_token, _system) module_exit(_token##_system) |
| 569 | #define module_exit_eval(_token, _system) module_exit_eval1(_token, _system) |
| 570 | |
| 571 | static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void) |
| 572 | { |
| 573 | int ret; |
| 574 | int i; |
| 575 | |
| 576 | wrapper_vmalloc_sync_all(); |
| 577 | ret = TP_ID(__lttng_types_init__, TRACE_SYSTEM)(); |
| 578 | if (ret) |
| 579 | return ret; |
| 580 | for (i = 0; i < ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)); i++) { |
| 581 | const struct lttng_event_desc *event_desc; |
| 582 | |
| 583 | event_desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[i]; |
| 584 | ret = ltt_probe_register(event_desc->name, |
| 585 | event_desc->probe_callback); |
| 586 | if (ret) |
| 587 | goto error; |
| 588 | } |
| 589 | return 0; |
| 590 | |
| 591 | error: |
| 592 | for (i--; i >= 0; i--) { |
| 593 | const struct lttng_event_desc *event_desc; |
| 594 | |
| 595 | event_desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[i]; |
| 596 | ltt_probe_unregister(event_desc->name); |
| 597 | } |
| 598 | return ret; |
| 599 | } |
| 600 | |
| 601 | module_init_eval(__lttng_events_init__, TRACE_SYSTEM); |
| 602 | |
| 603 | static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void) |
| 604 | { |
| 605 | int i; |
| 606 | |
| 607 | for (i = 0; i < ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)); i++) { |
| 608 | const struct lttng_event_desc *event_desc; |
| 609 | |
| 610 | event_desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[i]; |
| 611 | ltt_probe_unregister(event_desc->name); |
| 612 | } |
| 613 | TP_ID(__lttng_types_exit__, TRACE_SYSTEM)(); |
| 614 | } |
| 615 | |
| 616 | module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM); |
| 617 | |
| 618 | #undef module_init_eval |
| 619 | #undef module_exit_eval |
| 620 | #undef TP_ID1 |
| 621 | #undef TP_ID |