| 1 | /* |
| 2 | * Copyright (C) 2005,2006,2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) |
| 3 | * Copyright (C) 2009 Pierre-Marc Fournier |
| 4 | * |
| 5 | * This contains the definitions for the Linux Trace Toolkit tracer. |
| 6 | * |
| 7 | * Ported to userspace by Pierre-Marc Fournier. |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | #ifndef _LTT_TRACER_H |
| 25 | #define _LTT_TRACER_H |
| 26 | |
| 27 | #include <sys/types.h> |
| 28 | #include <stdarg.h> |
| 29 | //#include "list.h" |
| 30 | #include "kernelcompat.h" |
| 31 | #include "buffer.h" |
| 32 | #include "relay.h" |
| 33 | #include "channels.h" |
| 34 | #include "tracercore.h" |
| 35 | #include "marker.h" |
| 36 | |
| 37 | /* Number of bytes to log with a read/write event */ |
| 38 | #define LTT_LOG_RW_SIZE 32L |
| 39 | |
| 40 | /* Interval (in jiffies) at which the LTT per-CPU timer fires */ |
| 41 | #define LTT_PERCPU_TIMER_INTERVAL 1 |
| 42 | |
| 43 | #ifndef LTT_ARCH_TYPE |
| 44 | #define LTT_ARCH_TYPE LTT_ARCH_TYPE_UNDEFINED |
| 45 | #endif |
| 46 | |
| 47 | #ifndef LTT_ARCH_VARIANT |
| 48 | #define LTT_ARCH_VARIANT LTT_ARCH_VARIANT_NONE |
| 49 | #endif |
| 50 | |
| 51 | struct ltt_active_marker; |
| 52 | |
| 53 | /* Maximum number of callbacks per marker */ |
| 54 | #define LTT_NR_CALLBACKS 10 |
| 55 | |
| 56 | struct ltt_serialize_closure; |
| 57 | struct ltt_probe_private_data; |
| 58 | |
| 59 | /* Serialization callback '%k' */ |
| 60 | typedef size_t (*ltt_serialize_cb)(struct rchan_buf *buf, size_t buf_offset, |
| 61 | struct ltt_serialize_closure *closure, |
| 62 | void *serialize_private, int *largest_align, |
| 63 | const char *fmt, va_list *args); |
| 64 | |
| 65 | struct ltt_serialize_closure { |
| 66 | ltt_serialize_cb *callbacks; |
| 67 | long cb_args[LTT_NR_CALLBACKS]; |
| 68 | unsigned int cb_idx; |
| 69 | }; |
| 70 | |
| 71 | extern size_t ltt_serialize_data(struct rchan_buf *buf, size_t buf_offset, |
| 72 | struct ltt_serialize_closure *closure, |
| 73 | void *serialize_private, |
| 74 | int *largest_align, const char *fmt, va_list *args); |
| 75 | |
| 76 | struct ltt_available_probe { |
| 77 | const char *name; /* probe name */ |
| 78 | const char *format; |
| 79 | marker_probe_func *probe_func; |
| 80 | ltt_serialize_cb callbacks[LTT_NR_CALLBACKS]; |
| 81 | struct list_head node; /* registered probes list */ |
| 82 | }; |
| 83 | |
| 84 | struct ltt_probe_private_data { |
| 85 | struct ltt_trace_struct *trace; /* |
| 86 | * Target trace, for metadata |
| 87 | * or statedump. |
| 88 | */ |
| 89 | ltt_serialize_cb serializer; /* |
| 90 | * Serialization function override. |
| 91 | */ |
| 92 | void *serialize_private; /* |
| 93 | * Private data for serialization |
| 94 | * functions. |
| 95 | */ |
| 96 | }; |
| 97 | |
| 98 | enum ltt_channels { |
| 99 | LTT_CHANNEL_METADATA, |
| 100 | LTT_CHANNEL_UST, |
| 101 | }; |
| 102 | |
| 103 | struct ltt_active_marker { |
| 104 | struct list_head node; /* active markers list */ |
| 105 | const char *channel; |
| 106 | const char *name; |
| 107 | const char *format; |
| 108 | struct ltt_available_probe *probe; |
| 109 | }; |
| 110 | |
| 111 | struct marker; //ust// |
| 112 | extern void ltt_vtrace(const struct marker *mdata, void *probe_data, |
| 113 | void *call_data, const char *fmt, va_list *args); |
| 114 | extern void ltt_trace(const struct marker *mdata, void *probe_data, |
| 115 | void *call_data, const char *fmt, ...); |
| 116 | |
| 117 | /* |
| 118 | * Unique ID assigned to each registered probe. |
| 119 | */ |
| 120 | enum marker_id { |
| 121 | MARKER_ID_SET_MARKER_ID = 0, /* Static IDs available (range 0-7) */ |
| 122 | MARKER_ID_SET_MARKER_FORMAT, |
| 123 | MARKER_ID_COMPACT, /* Compact IDs (range: 8-127) */ |
| 124 | MARKER_ID_DYNAMIC, /* Dynamic IDs (range: 128-65535) */ |
| 125 | }; |
| 126 | |
| 127 | /* static ids 0-1 reserved for internal use. */ |
| 128 | #define MARKER_CORE_IDS 2 |
| 129 | static inline enum marker_id marker_id_type(uint16_t id) |
| 130 | { |
| 131 | if (id < MARKER_CORE_IDS) |
| 132 | return (enum marker_id)id; |
| 133 | else |
| 134 | return MARKER_ID_DYNAMIC; |
| 135 | } |
| 136 | |
| 137 | struct user_dbg_data { |
| 138 | unsigned long avail_size; |
| 139 | unsigned long write; |
| 140 | unsigned long read; |
| 141 | }; |
| 142 | |
| 143 | struct ltt_trace_ops { |
| 144 | /* First 32 bytes cache-hot cacheline */ |
| 145 | int (*reserve_slot) (struct ltt_trace_struct *trace, |
| 146 | struct ltt_channel_struct *channel, |
| 147 | void **transport_data, size_t data_size, |
| 148 | size_t *slot_size, long *buf_offset, u64 *tsc, |
| 149 | unsigned int *rflags, |
| 150 | int largest_align); |
| 151 | //ust// void (*commit_slot) (struct ltt_channel_struct *channel, |
| 152 | //ust// void **transport_data, long buf_offset, |
| 153 | //ust// size_t slot_size); |
| 154 | void (*wakeup_channel) (struct ltt_channel_struct *ltt_channel); |
| 155 | int (*user_blocking) (struct ltt_trace_struct *trace, |
| 156 | unsigned int index, size_t data_size, |
| 157 | struct user_dbg_data *dbg); |
| 158 | /* End of first 32 bytes cacheline */ |
| 159 | int (*create_dirs) (struct ltt_trace_struct *new_trace); |
| 160 | void (*remove_dirs) (struct ltt_trace_struct *new_trace); |
| 161 | int (*create_channel) (const char *trace_name, |
| 162 | struct ltt_trace_struct *trace, |
| 163 | struct dentry *dir, const char *channel_name, |
| 164 | struct ltt_channel_struct *ltt_chan, |
| 165 | unsigned int subbuf_size, |
| 166 | unsigned int n_subbufs, int overwrite); |
| 167 | void (*finish_channel) (struct ltt_channel_struct *channel); |
| 168 | void (*remove_channel) (struct ltt_channel_struct *channel); |
| 169 | void (*user_errors) (struct ltt_trace_struct *trace, |
| 170 | unsigned int index, size_t data_size, |
| 171 | struct user_dbg_data *dbg); |
| 172 | } ____cacheline_aligned; |
| 173 | |
| 174 | struct ltt_transport { |
| 175 | char *name; |
| 176 | struct module *owner; |
| 177 | struct list_head node; |
| 178 | struct ltt_trace_ops ops; |
| 179 | }; |
| 180 | |
| 181 | enum trace_mode { LTT_TRACE_NORMAL, LTT_TRACE_FLIGHT, LTT_TRACE_HYBRID }; |
| 182 | |
| 183 | #define CHANNEL_FLAG_ENABLE (1U<<0) |
| 184 | #define CHANNEL_FLAG_OVERWRITE (1U<<1) |
| 185 | |
| 186 | /* Per-trace information - each trace/flight recorder represented by one */ |
| 187 | struct ltt_trace_struct { |
| 188 | /* First 32 bytes cache-hot cacheline */ |
| 189 | struct list_head list; |
| 190 | struct ltt_trace_ops *ops; |
| 191 | int active; |
| 192 | /* Second 32 bytes cache-hot cacheline */ |
| 193 | struct ltt_channel_struct *channels; |
| 194 | unsigned int nr_channels; |
| 195 | u32 freq_scale; |
| 196 | u64 start_freq; |
| 197 | u64 start_tsc; |
| 198 | unsigned long long start_monotonic; |
| 199 | struct timeval start_time; |
| 200 | struct ltt_channel_setting *settings; |
| 201 | struct { |
| 202 | struct dentry *trace_root; |
| 203 | } dentry; |
| 204 | struct kref kref; /* Each channel has a kref of the trace struct */ |
| 205 | struct ltt_transport *transport; |
| 206 | struct kref ltt_transport_kref; |
| 207 | char trace_name[NAME_MAX]; |
| 208 | } ____cacheline_aligned; |
| 209 | |
| 210 | /* Hardcoded event headers |
| 211 | * |
| 212 | * event header for a trace with active heartbeat : 27 bits timestamps |
| 213 | * |
| 214 | * headers are 32-bits aligned. In order to insure such alignment, a dynamic per |
| 215 | * trace alignment value must be done. |
| 216 | * |
| 217 | * Remember that the C compiler does align each member on the boundary |
| 218 | * equivalent to their own size. |
| 219 | * |
| 220 | * As relay subbuffers are aligned on pages, we are sure that they are 4 and 8 |
| 221 | * bytes aligned, so the buffer header and trace header are aligned. |
| 222 | * |
| 223 | * Event headers are aligned depending on the trace alignment option. |
| 224 | * |
| 225 | * Note using C structure bitfields for cross-endianness and portability |
| 226 | * concerns. |
| 227 | */ |
| 228 | |
| 229 | #define LTT_RESERVED_EVENTS 3 |
| 230 | #define LTT_EVENT_BITS 5 |
| 231 | #define LTT_FREE_EVENTS ((1 << LTT_EVENT_BITS) - LTT_RESERVED_EVENTS) |
| 232 | #define LTT_TSC_BITS 27 |
| 233 | #define LTT_TSC_MASK ((1 << LTT_TSC_BITS) - 1) |
| 234 | |
| 235 | struct ltt_event_header { |
| 236 | u32 id_time; /* 5 bits event id (MSB); 27 bits time (LSB) */ |
| 237 | }; |
| 238 | |
| 239 | /* Reservation flags */ |
| 240 | #define LTT_RFLAG_ID (1 << 0) |
| 241 | #define LTT_RFLAG_ID_SIZE (1 << 1) |
| 242 | #define LTT_RFLAG_ID_SIZE_TSC (1 << 2) |
| 243 | |
| 244 | /* |
| 245 | * We use asm/timex.h : cpu_khz/HZ variable in here : we might have to deal |
| 246 | * specifically with CPU frequency scaling someday, so using an interpolation |
| 247 | * between the start and end of buffer values is not flexible enough. Using an |
| 248 | * immediate frequency value permits to calculate directly the times for parts |
| 249 | * of a buffer that would be before a frequency change. |
| 250 | * |
| 251 | * Keep the natural field alignment for _each field_ within this structure if |
| 252 | * you ever add/remove a field from this header. Packed attribute is not used |
| 253 | * because gcc generates poor code on at least powerpc and mips. Don't ever |
| 254 | * let gcc add padding between the structure elements. |
| 255 | */ |
| 256 | struct ltt_subbuffer_header { |
| 257 | uint64_t cycle_count_begin; /* Cycle count at subbuffer start */ |
| 258 | uint64_t cycle_count_end; /* Cycle count at subbuffer end */ |
| 259 | uint32_t magic_number; /* |
| 260 | * Trace magic number. |
| 261 | * contains endianness information. |
| 262 | */ |
| 263 | uint8_t major_version; |
| 264 | uint8_t minor_version; |
| 265 | uint8_t arch_size; /* Architecture pointer size */ |
| 266 | uint8_t alignment; /* LTT data alignment */ |
| 267 | uint64_t start_time_sec; /* NTP-corrected start time */ |
| 268 | uint64_t start_time_usec; |
| 269 | uint64_t start_freq; /* |
| 270 | * Frequency at trace start, |
| 271 | * used all along the trace. |
| 272 | */ |
| 273 | uint32_t freq_scale; /* Frequency scaling (divisor) */ |
| 274 | uint32_t lost_size; /* Size unused at end of subbuffer */ |
| 275 | uint32_t buf_size; /* Size of this subbuffer */ |
| 276 | uint32_t events_lost; /* |
| 277 | * Events lost in this subbuffer since |
| 278 | * the beginning of the trace. |
| 279 | * (may overflow) |
| 280 | */ |
| 281 | uint32_t subbuf_corrupt; /* |
| 282 | * Corrupted (lost) subbuffers since |
| 283 | * the begginig of the trace. |
| 284 | * (may overflow) |
| 285 | */ |
| 286 | uint8_t header_end[0]; /* End of header */ |
| 287 | }; |
| 288 | |
| 289 | /** |
| 290 | * ltt_subbuffer_header_size - called on buffer-switch to a new sub-buffer |
| 291 | * |
| 292 | * Return header size without padding after the structure. Don't use packed |
| 293 | * structure because gcc generates inefficient code on some architectures |
| 294 | * (powerpc, mips..) |
| 295 | */ |
| 296 | static inline size_t ltt_subbuffer_header_size(void) |
| 297 | { |
| 298 | return offsetof(struct ltt_subbuffer_header, header_end); |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * ltt_get_header_size |
| 303 | * |
| 304 | * Calculate alignment offset to 32-bits. This is the alignment offset of the |
| 305 | * event header. |
| 306 | * |
| 307 | * Important note : |
| 308 | * The event header must be 32-bits. The total offset calculated here : |
| 309 | * |
| 310 | * Alignment of header struct on 32 bits (min arch size, header size) |
| 311 | * + sizeof(header struct) (32-bits) |
| 312 | * + (opt) u16 (ext. event id) |
| 313 | * + (opt) u16 (event_size) (if event_size == 0xFFFFUL, has ext. event size) |
| 314 | * + (opt) u32 (ext. event size) |
| 315 | * + (opt) u64 full TSC (aligned on min(64-bits, arch size)) |
| 316 | * |
| 317 | * The payload must itself determine its own alignment from the biggest type it |
| 318 | * contains. |
| 319 | * */ |
| 320 | static inline unsigned char ltt_get_header_size( |
| 321 | struct ltt_channel_struct *channel, |
| 322 | size_t offset, |
| 323 | size_t data_size, |
| 324 | size_t *before_hdr_pad, |
| 325 | unsigned int rflags) |
| 326 | { |
| 327 | size_t orig_offset = offset; |
| 328 | size_t padding; |
| 329 | |
| 330 | padding = ltt_align(offset, sizeof(struct ltt_event_header)); |
| 331 | offset += padding; |
| 332 | offset += sizeof(struct ltt_event_header); |
| 333 | |
| 334 | switch (rflags) { |
| 335 | case LTT_RFLAG_ID_SIZE_TSC: |
| 336 | offset += sizeof(u16) + sizeof(u16); |
| 337 | if (data_size >= 0xFFFFU) |
| 338 | offset += sizeof(u32); |
| 339 | offset += ltt_align(offset, sizeof(u64)); |
| 340 | offset += sizeof(u64); |
| 341 | break; |
| 342 | case LTT_RFLAG_ID_SIZE: |
| 343 | offset += sizeof(u16) + sizeof(u16); |
| 344 | if (data_size >= 0xFFFFU) |
| 345 | offset += sizeof(u32); |
| 346 | break; |
| 347 | case LTT_RFLAG_ID: |
| 348 | offset += sizeof(u16); |
| 349 | break; |
| 350 | } |
| 351 | |
| 352 | *before_hdr_pad = padding; |
| 353 | return offset - orig_offset; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * ltt_write_event_header |
| 358 | * |
| 359 | * Writes the event header to the offset (already aligned on 32-bits). |
| 360 | * |
| 361 | * @trace : trace to write to. |
| 362 | * @channel : pointer to the channel structure.. |
| 363 | * @buf : buffer to write to. |
| 364 | * @buf_offset : buffer offset to write to (aligned on 32 bits). |
| 365 | * @eID : event ID |
| 366 | * @event_size : size of the event, excluding the event header. |
| 367 | * @tsc : time stamp counter. |
| 368 | * @rflags : reservation flags. |
| 369 | * |
| 370 | * returns : offset where the event data must be written. |
| 371 | */ |
| 372 | static inline size_t ltt_write_event_header(struct ltt_trace_struct *trace, |
| 373 | struct ltt_channel_struct *channel, |
| 374 | struct rchan_buf *buf, long buf_offset, |
| 375 | u16 eID, size_t event_size, |
| 376 | u64 tsc, unsigned int rflags) |
| 377 | { |
| 378 | struct ltt_event_header header; |
| 379 | size_t small_size; |
| 380 | |
| 381 | switch (rflags) { |
| 382 | case LTT_RFLAG_ID_SIZE_TSC: |
| 383 | header.id_time = 29 << LTT_TSC_BITS; |
| 384 | break; |
| 385 | case LTT_RFLAG_ID_SIZE: |
| 386 | header.id_time = 30 << LTT_TSC_BITS; |
| 387 | break; |
| 388 | case LTT_RFLAG_ID: |
| 389 | header.id_time = 31 << LTT_TSC_BITS; |
| 390 | break; |
| 391 | default: |
| 392 | header.id_time = eID << LTT_TSC_BITS; |
| 393 | break; |
| 394 | } |
| 395 | header.id_time |= (u32)tsc & LTT_TSC_MASK; |
| 396 | ltt_relay_write(buf, buf_offset, &header, sizeof(header)); |
| 397 | buf_offset += sizeof(header); |
| 398 | |
| 399 | switch (rflags) { |
| 400 | case LTT_RFLAG_ID_SIZE_TSC: |
| 401 | small_size = min_t(size_t, event_size, 0xFFFFU); |
| 402 | ltt_relay_write(buf, buf_offset, |
| 403 | (u16[]){ (u16)eID }, sizeof(u16)); |
| 404 | buf_offset += sizeof(u16); |
| 405 | ltt_relay_write(buf, buf_offset, |
| 406 | (u16[]){ (u16)small_size }, sizeof(u16)); |
| 407 | buf_offset += sizeof(u16); |
| 408 | if (small_size == 0xFFFFU) { |
| 409 | ltt_relay_write(buf, buf_offset, |
| 410 | (u32[]){ (u32)event_size }, sizeof(u32)); |
| 411 | buf_offset += sizeof(u32); |
| 412 | } |
| 413 | buf_offset += ltt_align(buf_offset, sizeof(u64)); |
| 414 | ltt_relay_write(buf, buf_offset, |
| 415 | (u64[]){ (u64)tsc }, sizeof(u64)); |
| 416 | buf_offset += sizeof(u64); |
| 417 | break; |
| 418 | case LTT_RFLAG_ID_SIZE: |
| 419 | small_size = min_t(size_t, event_size, 0xFFFFU); |
| 420 | ltt_relay_write(buf, buf_offset, |
| 421 | (u16[]){ (u16)eID }, sizeof(u16)); |
| 422 | buf_offset += sizeof(u16); |
| 423 | ltt_relay_write(buf, buf_offset, |
| 424 | (u16[]){ (u16)small_size }, sizeof(u16)); |
| 425 | buf_offset += sizeof(u16); |
| 426 | if (small_size == 0xFFFFU) { |
| 427 | ltt_relay_write(buf, buf_offset, |
| 428 | (u32[]){ (u32)event_size }, sizeof(u32)); |
| 429 | buf_offset += sizeof(u32); |
| 430 | } |
| 431 | break; |
| 432 | case LTT_RFLAG_ID: |
| 433 | ltt_relay_write(buf, buf_offset, |
| 434 | (u16[]){ (u16)eID }, sizeof(u16)); |
| 435 | buf_offset += sizeof(u16); |
| 436 | break; |
| 437 | default: |
| 438 | break; |
| 439 | } |
| 440 | |
| 441 | return buf_offset; |
| 442 | } |
| 443 | |
| 444 | /* Lockless LTTng */ |
| 445 | |
| 446 | /* |
| 447 | * ltt_reserve_slot |
| 448 | * |
| 449 | * Atomic slot reservation in a LTTng buffer. It will take care of |
| 450 | * sub-buffer switching. |
| 451 | * |
| 452 | * Parameters: |
| 453 | * |
| 454 | * @trace : the trace structure to log to. |
| 455 | * @channel : the chanel to reserve space into. |
| 456 | * @transport_data : specific transport data. |
| 457 | * @data_size : size of the variable length data to log. |
| 458 | * @slot_size : pointer to total size of the slot (out) |
| 459 | * @buf_offset : pointer to reserve offset (out) |
| 460 | * @tsc : pointer to the tsc at the slot reservation (out) |
| 461 | * @rflags : reservation flags (header specificity) |
| 462 | * @cpu : cpu id |
| 463 | * |
| 464 | * Return : -ENOSPC if not enough space, else 0. |
| 465 | */ |
| 466 | static inline int ltt_reserve_slot( |
| 467 | struct ltt_trace_struct *trace, |
| 468 | struct ltt_channel_struct *channel, |
| 469 | void **transport_data, |
| 470 | size_t data_size, |
| 471 | size_t *slot_size, |
| 472 | long *buf_offset, |
| 473 | u64 *tsc, |
| 474 | unsigned int *rflags, |
| 475 | int largest_align) |
| 476 | { |
| 477 | return trace->ops->reserve_slot(trace, channel, transport_data, |
| 478 | data_size, slot_size, buf_offset, tsc, rflags, |
| 479 | largest_align); |
| 480 | } |
| 481 | |
| 482 | |
| 483 | ///* |
| 484 | // * ltt_commit_slot |
| 485 | // * |
| 486 | // * Atomic unordered slot commit. Increments the commit count in the |
| 487 | // * specified sub-buffer, and delivers it if necessary. |
| 488 | // * |
| 489 | // * Parameters: |
| 490 | // * |
| 491 | // * @channel : the chanel to reserve space into. |
| 492 | // * @transport_data : specific transport data. |
| 493 | // * @buf_offset : offset of beginning of reserved slot |
| 494 | // * @slot_size : size of the reserved slot. |
| 495 | // */ |
| 496 | //static inline void ltt_commit_slot( |
| 497 | // struct ltt_channel_struct *channel, |
| 498 | // void **transport_data, |
| 499 | // long buf_offset, |
| 500 | // size_t slot_size) |
| 501 | //{ |
| 502 | // struct ltt_trace_struct *trace = channel->trace; |
| 503 | // |
| 504 | // trace->ops->commit_slot(channel, transport_data, buf_offset, slot_size); |
| 505 | //} |
| 506 | |
| 507 | /* |
| 508 | * Control channels : |
| 509 | * control/metadata |
| 510 | * control/interrupts |
| 511 | * control/... |
| 512 | * |
| 513 | * cpu channel : |
| 514 | * cpu |
| 515 | */ |
| 516 | |
| 517 | #define LTT_METADATA_CHANNEL "metadata_state" |
| 518 | #define LTT_UST_CHANNEL "ust" |
| 519 | |
| 520 | #define LTT_FLIGHT_PREFIX "flight-" |
| 521 | |
| 522 | /* Tracer properties */ |
| 523 | //#define LTT_DEFAULT_SUBBUF_SIZE_LOW 134217728 |
| 524 | #define LTT_DEFAULT_SUBBUF_SIZE_LOW 65536 |
| 525 | //#define LTT_DEFAULT_SUBBUF_SIZE_LOW 4096 |
| 526 | #define LTT_DEFAULT_N_SUBBUFS_LOW 2 |
| 527 | //#define LTT_DEFAULT_SUBBUF_SIZE_MED 134217728 |
| 528 | #define LTT_DEFAULT_SUBBUF_SIZE_MED 262144 |
| 529 | //#define LTT_DEFAULT_SUBBUF_SIZE_MED 4096 |
| 530 | #define LTT_DEFAULT_N_SUBBUFS_MED 2 |
| 531 | //#define LTT_DEFAULT_SUBBUF_SIZE_HIGH 134217728 |
| 532 | #define LTT_DEFAULT_SUBBUF_SIZE_HIGH 1048576 |
| 533 | //#define LTT_DEFAULT_SUBBUF_SIZE_HIGH 4096 |
| 534 | #define LTT_DEFAULT_N_SUBBUFS_HIGH 2 |
| 535 | #define LTT_TRACER_MAGIC_NUMBER 0x00D6B7ED |
| 536 | #define LTT_TRACER_VERSION_MAJOR 2 |
| 537 | #define LTT_TRACER_VERSION_MINOR 3 |
| 538 | |
| 539 | /* |
| 540 | * Size reserved for high priority events (interrupts, NMI, BH) at the end of a |
| 541 | * nearly full buffer. User space won't use this last amount of space when in |
| 542 | * blocking mode. This space also includes the event header that would be |
| 543 | * written by this user space event. |
| 544 | */ |
| 545 | #define LTT_RESERVE_CRITICAL 4096 |
| 546 | |
| 547 | /* Register and unregister function pointers */ |
| 548 | |
| 549 | enum ltt_module_function { |
| 550 | LTT_FUNCTION_RUN_FILTER, |
| 551 | LTT_FUNCTION_FILTER_CONTROL, |
| 552 | LTT_FUNCTION_STATEDUMP |
| 553 | }; |
| 554 | |
| 555 | extern void ltt_transport_register(struct ltt_transport *transport); |
| 556 | extern void ltt_transport_unregister(struct ltt_transport *transport); |
| 557 | |
| 558 | /* Exported control function */ |
| 559 | |
| 560 | union ltt_control_args { |
| 561 | struct { |
| 562 | enum trace_mode mode; |
| 563 | unsigned int subbuf_size_low; |
| 564 | unsigned int n_subbufs_low; |
| 565 | unsigned int subbuf_size_med; |
| 566 | unsigned int n_subbufs_med; |
| 567 | unsigned int subbuf_size_high; |
| 568 | unsigned int n_subbufs_high; |
| 569 | } new_trace; |
| 570 | }; |
| 571 | |
| 572 | extern int _ltt_trace_setup(const char *trace_name); |
| 573 | extern int ltt_trace_setup(const char *trace_name); |
| 574 | extern struct ltt_trace_struct *_ltt_trace_find_setup(const char *trace_name); |
| 575 | extern int ltt_trace_set_type(const char *trace_name, const char *trace_type); |
| 576 | extern int ltt_trace_set_channel_subbufsize(const char *trace_name, |
| 577 | const char *channel_name, unsigned int size); |
| 578 | extern int ltt_trace_set_channel_subbufcount(const char *trace_name, |
| 579 | const char *channel_name, unsigned int cnt); |
| 580 | extern int ltt_trace_set_channel_enable(const char *trace_name, |
| 581 | const char *channel_name, unsigned int enable); |
| 582 | extern int ltt_trace_set_channel_overwrite(const char *trace_name, |
| 583 | const char *channel_name, unsigned int overwrite); |
| 584 | extern int ltt_trace_alloc(const char *trace_name); |
| 585 | extern int ltt_trace_destroy(const char *trace_name); |
| 586 | extern int ltt_trace_start(const char *trace_name); |
| 587 | extern int ltt_trace_stop(const char *trace_name); |
| 588 | |
| 589 | enum ltt_filter_control_msg { |
| 590 | LTT_FILTER_DEFAULT_ACCEPT, |
| 591 | LTT_FILTER_DEFAULT_REJECT |
| 592 | }; |
| 593 | |
| 594 | extern int ltt_filter_control(enum ltt_filter_control_msg msg, |
| 595 | const char *trace_name); |
| 596 | |
| 597 | extern struct dentry *get_filter_root(void); |
| 598 | |
| 599 | extern void ltt_write_trace_header(struct ltt_trace_struct *trace, |
| 600 | struct ltt_subbuffer_header *header); |
| 601 | extern void ltt_buffer_destroy(struct ltt_channel_struct *ltt_chan); |
| 602 | |
| 603 | extern void ltt_core_register(int (*function)(u8, void *)); |
| 604 | |
| 605 | extern void ltt_core_unregister(void); |
| 606 | |
| 607 | extern void ltt_release_trace(struct kref *kref); |
| 608 | extern void ltt_release_transport(struct kref *kref); |
| 609 | |
| 610 | extern int ltt_probe_register(struct ltt_available_probe *pdata); |
| 611 | extern int ltt_probe_unregister(struct ltt_available_probe *pdata); |
| 612 | extern int ltt_marker_connect(const char *channel, const char *mname, |
| 613 | const char *pname); |
| 614 | extern int ltt_marker_disconnect(const char *channel, const char *mname, |
| 615 | const char *pname); |
| 616 | extern void ltt_dump_marker_state(struct ltt_trace_struct *trace); |
| 617 | |
| 618 | extern void ltt_lock_traces(void); |
| 619 | extern void ltt_unlock_traces(void); |
| 620 | |
| 621 | extern struct ltt_trace_struct *_ltt_trace_find(const char *trace_name); |
| 622 | |
| 623 | #endif /* _LTT_TRACER_H */ |