| 1 | /* |
| 2 | * Copyright (C) 2005,2006,2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) |
| 3 | * |
| 4 | * This contains the definitions for the Linux Trace Toolkit tracer. |
| 5 | * |
| 6 | * Dual LGPL v2.1/GPL v2 license. |
| 7 | */ |
| 8 | |
| 9 | #ifndef _LTT_TRACER_H |
| 10 | #define _LTT_TRACER_H |
| 11 | |
| 12 | #include <stdarg.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/limits.h> |
| 15 | #include <linux/list.h> |
| 16 | #include <linux/cache.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/timex.h> |
| 19 | #include <linux/wait.h> |
| 20 | #include <linux/marker.h> |
| 21 | #include <linux/trace-clock.h> |
| 22 | #include <linux/ltt-channels.h> |
| 23 | #include <asm/atomic.h> |
| 24 | #include <asm/local.h> |
| 25 | |
| 26 | #include "ltt-tracer-core.h" |
| 27 | #include "ltt-relay.h" |
| 28 | |
| 29 | /* Number of bytes to log with a read/write event */ |
| 30 | #define LTT_LOG_RW_SIZE 32L |
| 31 | |
| 32 | /* Interval (in jiffies) at which the LTT per-CPU timer fires */ |
| 33 | #define LTT_PERCPU_TIMER_INTERVAL 1 |
| 34 | |
| 35 | #ifndef LTT_ARCH_TYPE |
| 36 | #define LTT_ARCH_TYPE LTT_ARCH_TYPE_UNDEFINED |
| 37 | #endif |
| 38 | |
| 39 | #ifndef LTT_ARCH_VARIANT |
| 40 | #define LTT_ARCH_VARIANT LTT_ARCH_VARIANT_NONE |
| 41 | #endif |
| 42 | |
| 43 | struct ltt_active_marker; |
| 44 | |
| 45 | /* Maximum number of callbacks per marker */ |
| 46 | #define LTT_NR_CALLBACKS 10 |
| 47 | |
| 48 | struct ltt_serialize_closure { |
| 49 | ltt_serialize_cb *callbacks; |
| 50 | long cb_args[LTT_NR_CALLBACKS]; |
| 51 | unsigned int cb_idx; |
| 52 | }; |
| 53 | |
| 54 | size_t ltt_serialize_data(struct ltt_chanbuf *buf, size_t buf_offset, |
| 55 | struct ltt_serialize_closure *closure, |
| 56 | void *serialize_private, unsigned int stack_pos_ctx, |
| 57 | int *largest_align, const char *fmt, va_list *args); |
| 58 | |
| 59 | struct ltt_available_probe { |
| 60 | const char *name; /* probe name */ |
| 61 | const char *format; |
| 62 | marker_probe_func *probe_func; |
| 63 | ltt_serialize_cb callbacks[LTT_NR_CALLBACKS]; |
| 64 | struct list_head node; /* registered probes list */ |
| 65 | }; |
| 66 | |
| 67 | enum ltt_channels { |
| 68 | LTT_CHANNEL_METADATA, |
| 69 | LTT_CHANNEL_FD_STATE, |
| 70 | LTT_CHANNEL_GLOBAL_STATE, |
| 71 | LTT_CHANNEL_IRQ_STATE, |
| 72 | LTT_CHANNEL_MODULE_STATE, |
| 73 | LTT_CHANNEL_NETIF_STATE, |
| 74 | LTT_CHANNEL_SOFTIRQ_STATE, |
| 75 | LTT_CHANNEL_SWAP_STATE, |
| 76 | LTT_CHANNEL_SYSCALL_STATE, |
| 77 | LTT_CHANNEL_TASK_STATE, |
| 78 | LTT_CHANNEL_VM_STATE, |
| 79 | LTT_CHANNEL_FS, |
| 80 | LTT_CHANNEL_INPUT, |
| 81 | LTT_CHANNEL_IPC, |
| 82 | LTT_CHANNEL_KERNEL, |
| 83 | LTT_CHANNEL_MM, |
| 84 | LTT_CHANNEL_RCU, |
| 85 | LTT_CHANNEL_DEFAULT, |
| 86 | }; |
| 87 | |
| 88 | struct ltt_active_marker { |
| 89 | struct list_head node; /* active markers list */ |
| 90 | const char *channel; |
| 91 | const char *name; |
| 92 | const char *format; |
| 93 | struct ltt_available_probe *probe; |
| 94 | }; |
| 95 | |
| 96 | extern void ltt_vtrace(const struct marker *mdata, void *probe_data, |
| 97 | void *call_data, const char *fmt, va_list *args); |
| 98 | extern void ltt_trace(const struct marker *mdata, void *probe_data, |
| 99 | void *call_data, const char *fmt, ...); |
| 100 | |
| 101 | size_t ltt_serialize_printf(struct ltt_chanbuf *buf, unsigned long buf_offset, |
| 102 | size_t *msg_size, char *output, size_t outlen, |
| 103 | const char *fmt); |
| 104 | |
| 105 | /* |
| 106 | * Unique ID assigned to each registered probe. |
| 107 | */ |
| 108 | enum marker_id { |
| 109 | MARKER_ID_SET_MARKER_ID = 0, /* Static IDs available (range 0-7) */ |
| 110 | MARKER_ID_SET_MARKER_FORMAT, |
| 111 | MARKER_ID_COMPACT, /* Compact IDs (range: 8-127) */ |
| 112 | MARKER_ID_DYNAMIC, /* Dynamic IDs (range: 128-65535) */ |
| 113 | }; |
| 114 | |
| 115 | /* static ids 0-1 reserved for internal use. */ |
| 116 | #define MARKER_CORE_IDS 2 |
| 117 | static __inline__ enum marker_id marker_id_type(uint16_t id) |
| 118 | { |
| 119 | if (id < MARKER_CORE_IDS) |
| 120 | return (enum marker_id)id; |
| 121 | else |
| 122 | return MARKER_ID_DYNAMIC; |
| 123 | } |
| 124 | |
| 125 | struct user_dbg_data { |
| 126 | unsigned long avail_size; |
| 127 | unsigned long write; |
| 128 | unsigned long read; |
| 129 | }; |
| 130 | |
| 131 | struct ltt_trace_ops { |
| 132 | /* First 32 bytes cache-hot cacheline */ |
| 133 | void (*wakeup_channel) (struct ltt_chan *chan); |
| 134 | int (*user_blocking) (struct ltt_trace *trace, unsigned int index, |
| 135 | size_t data_size, struct user_dbg_data *dbg); |
| 136 | /* End of first 32 bytes cacheline */ |
| 137 | int (*create_dirs) (struct ltt_trace *new_trace); |
| 138 | void (*remove_dirs) (struct ltt_trace *new_trace); |
| 139 | int (*create_channel) (const char *channel_name, struct ltt_chan *chan, |
| 140 | struct dentry *parent, size_t sb_size, |
| 141 | size_t n_sb, int overwrite, |
| 142 | struct ltt_trace *trace); |
| 143 | void (*finish_channel) (struct ltt_chan *chan); |
| 144 | void (*remove_channel) (struct kref *kref); |
| 145 | void (*remove_channel_files) (struct ltt_chan *chan); |
| 146 | void (*user_errors) (struct ltt_trace *trace, unsigned int index, |
| 147 | size_t data_size, struct user_dbg_data *dbg, |
| 148 | int cpu); |
| 149 | void (*start_switch_timer) (struct ltt_chan *chan); |
| 150 | void (*stop_switch_timer) (struct ltt_chan *chan); |
| 151 | #ifdef CONFIG_HOTPLUG_CPU |
| 152 | int (*handle_cpuhp) (struct notifier_block *nb, unsigned long action, |
| 153 | void *hcpu, struct ltt_trace *trace); |
| 154 | #endif |
| 155 | }; |
| 156 | |
| 157 | struct ltt_transport { |
| 158 | char *name; |
| 159 | struct module *owner; |
| 160 | struct list_head node; |
| 161 | struct ltt_trace_ops ops; |
| 162 | }; |
| 163 | |
| 164 | enum trace_mode { LTT_TRACE_NORMAL, LTT_TRACE_FLIGHT, LTT_TRACE_HYBRID }; |
| 165 | |
| 166 | #define CHANNEL_FLAG_ENABLE (1U<<0) |
| 167 | #define CHANNEL_FLAG_OVERWRITE (1U<<1) |
| 168 | |
| 169 | /* Per-trace information - each trace/flight recorder represented by one */ |
| 170 | struct ltt_trace { |
| 171 | /* First 32 bytes cache-hot cacheline */ |
| 172 | struct list_head list; |
| 173 | struct ltt_chan *channels; |
| 174 | unsigned int nr_channels; |
| 175 | int active; |
| 176 | /* Second 32 bytes cache-hot cacheline */ |
| 177 | struct ltt_trace_ops *ops; |
| 178 | u32 freq_scale; |
| 179 | u64 start_freq; |
| 180 | u64 start_tsc; |
| 181 | unsigned long long start_monotonic; |
| 182 | struct timeval start_time; |
| 183 | struct ltt_channel_setting *settings; |
| 184 | struct { |
| 185 | struct dentry *trace_root; |
| 186 | struct dentry *ascii_root; |
| 187 | } dentry; |
| 188 | struct kref kref; /* Each channel has a kref of the trace struct */ |
| 189 | struct ltt_transport *transport; |
| 190 | struct kref ltt_transport_kref; |
| 191 | wait_queue_head_t kref_wq; /* Place for ltt_trace_destroy to sleep */ |
| 192 | char trace_name[NAME_MAX]; |
| 193 | } ____cacheline_aligned; |
| 194 | |
| 195 | /* Hardcoded event headers |
| 196 | * |
| 197 | * event header for a trace with active heartbeat : 27 bits timestamps |
| 198 | * |
| 199 | * headers are 32-bits aligned. In order to insure such alignment, a dynamic per |
| 200 | * trace alignment value must be done. |
| 201 | * |
| 202 | * Remember that the C compiler does align each member on the boundary |
| 203 | * equivalent to their own size. |
| 204 | * |
| 205 | * As relay subbuffers are aligned on pages, we are sure that they are 4 and 8 |
| 206 | * bytes aligned, so the buffer header and trace header are aligned. |
| 207 | * |
| 208 | * Event headers are aligned depending on the trace alignment option. |
| 209 | * |
| 210 | * Note using C structure bitfields for cross-endianness and portability |
| 211 | * concerns. |
| 212 | */ |
| 213 | |
| 214 | #define LTT_RESERVED_EVENTS 3 |
| 215 | #define LTT_EVENT_BITS 5 |
| 216 | #define LTT_FREE_EVENTS ((1 << LTT_EVENT_BITS) - LTT_RESERVED_EVENTS) |
| 217 | #define LTT_TSC_BITS 27 |
| 218 | #define LTT_TSC_MASK ((1 << LTT_TSC_BITS) - 1) |
| 219 | |
| 220 | struct ltt_event_header { |
| 221 | u32 id_time; /* 5 bits event id (MSB); 27 bits time (LSB) */ |
| 222 | }; |
| 223 | |
| 224 | /* Reservation flags */ |
| 225 | #define LTT_RFLAG_ID (1 << 0) |
| 226 | #define LTT_RFLAG_ID_SIZE (1 << 1) |
| 227 | #define LTT_RFLAG_ID_SIZE_TSC (1 << 2) |
| 228 | |
| 229 | #define LTT_MAX_SMALL_SIZE 0xFFFFU |
| 230 | |
| 231 | /* |
| 232 | * We use asm/timex.h : cpu_khz/HZ variable in here : we might have to deal |
| 233 | * specifically with CPU frequency scaling someday, so using an interpolation |
| 234 | * between the start and end of buffer values is not flexible enough. Using an |
| 235 | * immediate frequency value permits to calculate directly the times for parts |
| 236 | * of a buffer that would be before a frequency change. |
| 237 | * |
| 238 | * Keep the natural field alignment for _each field_ within this structure if |
| 239 | * you ever add/remove a field from this header. Packed attribute is not used |
| 240 | * because gcc generates poor code on at least powerpc and mips. Don't ever |
| 241 | * let gcc add padding between the structure elements. |
| 242 | */ |
| 243 | struct ltt_subbuffer_header { |
| 244 | uint64_t cycle_count_begin; /* Cycle count at subbuffer start */ |
| 245 | uint64_t cycle_count_end; /* Cycle count at subbuffer end */ |
| 246 | uint32_t magic_number; /* |
| 247 | * Trace magic number. |
| 248 | * contains endianness information. |
| 249 | */ |
| 250 | uint8_t major_version; |
| 251 | uint8_t minor_version; |
| 252 | uint8_t arch_size; /* Architecture pointer size */ |
| 253 | uint8_t alignment; /* LTT data alignment */ |
| 254 | uint64_t start_time_sec; /* NTP-corrected start time */ |
| 255 | uint64_t start_time_usec; |
| 256 | uint64_t start_freq; /* |
| 257 | * Frequency at trace start, |
| 258 | * used all along the trace. |
| 259 | */ |
| 260 | uint32_t freq_scale; /* Frequency scaling (divisor) */ |
| 261 | uint32_t data_size; /* Size of data in subbuffer */ |
| 262 | uint32_t sb_size; /* Subbuffer size (include padding) */ |
| 263 | uint32_t events_lost; /* |
| 264 | * Events lost in this subbuffer since |
| 265 | * the beginning of the trace. |
| 266 | * (may overflow) |
| 267 | */ |
| 268 | uint32_t subbuf_corrupt; /* |
| 269 | * Corrupted (lost) subbuffers since |
| 270 | * the begginig of the trace. |
| 271 | * (may overflow) |
| 272 | */ |
| 273 | uint8_t header_end[0]; /* End of header */ |
| 274 | }; |
| 275 | |
| 276 | /** |
| 277 | * ltt_sb_header_size - called on buffer-switch to a new sub-buffer |
| 278 | * |
| 279 | * Return header size without padding after the structure. Don't use packed |
| 280 | * structure because gcc generates inefficient code on some architectures |
| 281 | * (powerpc, mips..) |
| 282 | */ |
| 283 | static __inline__ size_t ltt_sb_header_size(void) |
| 284 | { |
| 285 | return offsetof(struct ltt_subbuffer_header, header_end); |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * ltt_get_header_size |
| 290 | * |
| 291 | * Calculate alignment offset to 32-bits. This is the alignment offset of the |
| 292 | * event header. |
| 293 | * |
| 294 | * Important note : |
| 295 | * The event header must be 32-bits. The total offset calculated here : |
| 296 | * |
| 297 | * Alignment of header struct on 32 bits (min arch size, header size) |
| 298 | * + sizeof(header struct) (32-bits) |
| 299 | * + (opt) u16 (ext. event id) |
| 300 | * + (opt) u16 (event_size) |
| 301 | * (if event_size == LTT_MAX_SMALL_SIZE, has ext. event size) |
| 302 | * + (opt) u32 (ext. event size) |
| 303 | * + (opt) u64 full TSC (aligned on min(64-bits, arch size)) |
| 304 | * |
| 305 | * The payload must itself determine its own alignment from the biggest type it |
| 306 | * contains. |
| 307 | * */ |
| 308 | static __inline__ |
| 309 | unsigned char ltt_get_header_size(struct ltt_chan *chan, size_t offset, |
| 310 | size_t data_size, size_t *before_hdr_pad, |
| 311 | unsigned int rflags) |
| 312 | { |
| 313 | size_t orig_offset = offset; |
| 314 | size_t padding; |
| 315 | |
| 316 | BUILD_BUG_ON(sizeof(struct ltt_event_header) != sizeof(u32)); |
| 317 | |
| 318 | padding = ltt_align(offset, sizeof(struct ltt_event_header)); |
| 319 | offset += padding; |
| 320 | offset += sizeof(struct ltt_event_header); |
| 321 | |
| 322 | if (unlikely(rflags)) { |
| 323 | switch (rflags) { |
| 324 | case LTT_RFLAG_ID_SIZE_TSC: |
| 325 | offset += sizeof(u16) + sizeof(u16); |
| 326 | if (data_size >= LTT_MAX_SMALL_SIZE) |
| 327 | offset += sizeof(u32); |
| 328 | offset += ltt_align(offset, sizeof(u64)); |
| 329 | offset += sizeof(u64); |
| 330 | break; |
| 331 | case LTT_RFLAG_ID_SIZE: |
| 332 | offset += sizeof(u16) + sizeof(u16); |
| 333 | if (data_size >= LTT_MAX_SMALL_SIZE) |
| 334 | offset += sizeof(u32); |
| 335 | break; |
| 336 | case LTT_RFLAG_ID: |
| 337 | offset += sizeof(u16); |
| 338 | break; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | *before_hdr_pad = padding; |
| 343 | return offset - orig_offset; |
| 344 | } |
| 345 | |
| 346 | extern |
| 347 | size_t ltt_write_event_header_slow(struct ltt_chanbuf_alloc *bufa, |
| 348 | struct ltt_chan_alloc *chana, |
| 349 | long buf_offset, u16 eID, u32 event_size, |
| 350 | u64 tsc, unsigned int rflags); |
| 351 | |
| 352 | /* |
| 353 | * ltt_write_event_header |
| 354 | * |
| 355 | * Writes the event header to the offset (already aligned on 32-bits). |
| 356 | * |
| 357 | * @buf : buffer to write to. |
| 358 | * @chan : pointer to the channel structure.. |
| 359 | * @buf_offset : buffer offset to write to (aligned on 32 bits). |
| 360 | * @eID : event ID |
| 361 | * @event_size : size of the event, excluding the event header. |
| 362 | * @tsc : time stamp counter. |
| 363 | * @rflags : reservation flags. |
| 364 | * |
| 365 | * returns : offset where the event data must be written. |
| 366 | */ |
| 367 | static __inline__ |
| 368 | size_t ltt_write_event_header(struct ltt_chanbuf_alloc *bufa, |
| 369 | struct ltt_chan_alloc *chana, |
| 370 | long buf_offset, u16 eID, u32 event_size, u64 tsc, |
| 371 | unsigned int rflags) |
| 372 | { |
| 373 | struct ltt_event_header header; |
| 374 | |
| 375 | if (unlikely(rflags)) |
| 376 | goto slow_path; |
| 377 | |
| 378 | header.id_time = eID << LTT_TSC_BITS; |
| 379 | header.id_time |= (u32)tsc & LTT_TSC_MASK; |
| 380 | ltt_relay_write(bufa, chana, buf_offset, &header, sizeof(header)); |
| 381 | buf_offset += sizeof(header); |
| 382 | |
| 383 | return buf_offset; |
| 384 | |
| 385 | slow_path: |
| 386 | return ltt_write_event_header_slow(bufa, chana, buf_offset, |
| 387 | eID, event_size, tsc, rflags); |
| 388 | } |
| 389 | |
| 390 | /* |
| 391 | * ltt_read_event_header |
| 392 | * buf_offset must aligned on 32 bits |
| 393 | */ |
| 394 | static __inline__ |
| 395 | size_t ltt_read_event_header(struct ltt_chanbuf_alloc *bufa, long buf_offset, |
| 396 | u64 *tsc, u32 *event_size, u16 *eID, |
| 397 | unsigned int *rflags) |
| 398 | { |
| 399 | struct ltt_event_header header; |
| 400 | u16 small_size; |
| 401 | |
| 402 | ltt_relay_read(bufa, buf_offset, &header, sizeof(header)); |
| 403 | buf_offset += sizeof(header); |
| 404 | |
| 405 | *event_size = INT_MAX; |
| 406 | *eID = header.id_time >> LTT_TSC_BITS; |
| 407 | *tsc = header.id_time & LTT_TSC_MASK; |
| 408 | |
| 409 | switch (*eID) { |
| 410 | case 29: |
| 411 | *rflags = LTT_RFLAG_ID_SIZE_TSC; |
| 412 | ltt_relay_read(bufa, buf_offset, eID, sizeof(u16)); |
| 413 | buf_offset += sizeof(u16); |
| 414 | ltt_relay_read(bufa, buf_offset, &small_size, sizeof(u16)); |
| 415 | buf_offset += sizeof(u16); |
| 416 | if (small_size == LTT_MAX_SMALL_SIZE) { |
| 417 | ltt_relay_read(bufa, buf_offset, event_size, |
| 418 | sizeof(u32)); |
| 419 | buf_offset += sizeof(u32); |
| 420 | } else |
| 421 | *event_size = small_size; |
| 422 | buf_offset += ltt_align(buf_offset, sizeof(u64)); |
| 423 | ltt_relay_read(bufa, buf_offset, tsc, sizeof(u64)); |
| 424 | buf_offset += sizeof(u64); |
| 425 | break; |
| 426 | case 30: |
| 427 | *rflags = LTT_RFLAG_ID_SIZE; |
| 428 | ltt_relay_read(bufa, buf_offset, eID, sizeof(u16)); |
| 429 | buf_offset += sizeof(u16); |
| 430 | ltt_relay_read(bufa, buf_offset, &small_size, sizeof(u16)); |
| 431 | buf_offset += sizeof(u16); |
| 432 | if (small_size == LTT_MAX_SMALL_SIZE) { |
| 433 | ltt_relay_read(bufa, buf_offset, event_size, |
| 434 | sizeof(u32)); |
| 435 | buf_offset += sizeof(u32); |
| 436 | } else |
| 437 | *event_size = small_size; |
| 438 | break; |
| 439 | case 31: |
| 440 | *rflags = LTT_RFLAG_ID; |
| 441 | ltt_relay_read(bufa, buf_offset, eID, sizeof(u16)); |
| 442 | buf_offset += sizeof(u16); |
| 443 | break; |
| 444 | default: |
| 445 | *rflags = 0; |
| 446 | break; |
| 447 | } |
| 448 | |
| 449 | return buf_offset; |
| 450 | } |
| 451 | |
| 452 | /* Lockless LTTng */ |
| 453 | |
| 454 | /* Buffer offset macros */ |
| 455 | |
| 456 | /* |
| 457 | * BUFFER_TRUNC zeroes the subbuffer offset and the subbuffer number parts of |
| 458 | * the offset, which leaves only the buffer number. |
| 459 | */ |
| 460 | #define BUFFER_TRUNC(offset, chan) \ |
| 461 | ((offset) & (~((chan)->a.buf_size - 1))) |
| 462 | #define BUFFER_OFFSET(offset, chan) ((offset) & ((chan)->a.buf_size - 1)) |
| 463 | #define SUBBUF_OFFSET(offset, chan) ((offset) & ((chan)->a.sb_size - 1)) |
| 464 | #define SUBBUF_ALIGN(offset, chan) \ |
| 465 | (((offset) + (chan)->a.sb_size) & (~((chan)->a.sb_size - 1))) |
| 466 | #define SUBBUF_TRUNC(offset, chan) \ |
| 467 | ((offset) & (~((chan)->a.sb_size - 1))) |
| 468 | #define SUBBUF_INDEX(offset, chan) \ |
| 469 | (BUFFER_OFFSET((offset), chan) >> (chan)->a.sb_size_order) |
| 470 | |
| 471 | /* |
| 472 | * Control channels : |
| 473 | * control/metadata |
| 474 | * control/interrupts |
| 475 | * control/... |
| 476 | * |
| 477 | * cpu channel : |
| 478 | * cpu |
| 479 | */ |
| 480 | #define LTT_RELAY_ROOT "ltt" |
| 481 | #define LTT_RELAY_LOCKED_ROOT "ltt-locked" |
| 482 | |
| 483 | #define LTT_METADATA_CHANNEL "metadata_state" |
| 484 | #define LTT_FD_STATE_CHANNEL "fd_state" |
| 485 | #define LTT_GLOBAL_STATE_CHANNEL "global_state" |
| 486 | #define LTT_IRQ_STATE_CHANNEL "irq_state" |
| 487 | #define LTT_MODULE_STATE_CHANNEL "module_state" |
| 488 | #define LTT_NETIF_STATE_CHANNEL "netif_state" |
| 489 | #define LTT_SOFTIRQ_STATE_CHANNEL "softirq_state" |
| 490 | #define LTT_SWAP_STATE_CHANNEL "swap_state" |
| 491 | #define LTT_SYSCALL_STATE_CHANNEL "syscall_state" |
| 492 | #define LTT_TASK_STATE_CHANNEL "task_state" |
| 493 | #define LTT_VM_STATE_CHANNEL "vm_state" |
| 494 | #define LTT_FS_CHANNEL "fs" |
| 495 | #define LTT_INPUT_CHANNEL "input" |
| 496 | #define LTT_IPC_CHANNEL "ipc" |
| 497 | #define LTT_KERNEL_CHANNEL "kernel" |
| 498 | #define LTT_MM_CHANNEL "mm" |
| 499 | #define LTT_RCU_CHANNEL "rcu" |
| 500 | |
| 501 | #define LTT_FLIGHT_PREFIX "flight-" |
| 502 | |
| 503 | #define LTT_ASCII "ascii" |
| 504 | |
| 505 | /* Tracer properties */ |
| 506 | #define LTT_DEFAULT_SUBBUF_SIZE_LOW 65536 |
| 507 | #define LTT_DEFAULT_N_SUBBUFS_LOW 2 |
| 508 | #define LTT_DEFAULT_SUBBUF_SIZE_MED 262144 |
| 509 | #define LTT_DEFAULT_N_SUBBUFS_MED 2 |
| 510 | #define LTT_DEFAULT_SUBBUF_SIZE_HIGH 1048576 |
| 511 | #define LTT_DEFAULT_N_SUBBUFS_HIGH 2 |
| 512 | #define LTT_TRACER_MAGIC_NUMBER 0x00D6B7ED |
| 513 | #define LTT_TRACER_VERSION_MAJOR 2 |
| 514 | #define LTT_TRACER_VERSION_MINOR 6 |
| 515 | |
| 516 | /** |
| 517 | * ltt_write_trace_header - Write trace header |
| 518 | * @trace: Trace information |
| 519 | * @header: Memory address where the information must be written to |
| 520 | */ |
| 521 | static __inline__ |
| 522 | void ltt_write_trace_header(struct ltt_trace *trace, |
| 523 | struct ltt_subbuffer_header *header) |
| 524 | { |
| 525 | header->magic_number = LTT_TRACER_MAGIC_NUMBER; |
| 526 | header->major_version = LTT_TRACER_VERSION_MAJOR; |
| 527 | header->minor_version = LTT_TRACER_VERSION_MINOR; |
| 528 | header->arch_size = sizeof(void *); |
| 529 | header->alignment = ltt_get_alignment(); |
| 530 | header->start_time_sec = trace->start_time.tv_sec; |
| 531 | header->start_time_usec = trace->start_time.tv_usec; |
| 532 | header->start_freq = trace->start_freq; |
| 533 | header->freq_scale = trace->freq_scale; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Size reserved for high priority events (interrupts, NMI, BH) at the end of a |
| 538 | * nearly full buffer. User space won't use this last amount of space when in |
| 539 | * blocking mode. This space also includes the event header that would be |
| 540 | * written by this user space event. |
| 541 | */ |
| 542 | #define LTT_RESERVE_CRITICAL 4096 |
| 543 | |
| 544 | /* Register and unregister function pointers */ |
| 545 | |
| 546 | enum ltt_module_function { |
| 547 | LTT_FUNCTION_RUN_FILTER, |
| 548 | LTT_FUNCTION_FILTER_CONTROL, |
| 549 | LTT_FUNCTION_STATEDUMP |
| 550 | }; |
| 551 | |
| 552 | extern int ltt_module_register(enum ltt_module_function name, void *function, |
| 553 | struct module *owner); |
| 554 | extern void ltt_module_unregister(enum ltt_module_function name); |
| 555 | |
| 556 | void ltt_transport_register(struct ltt_transport *transport); |
| 557 | void ltt_transport_unregister(struct ltt_transport *transport); |
| 558 | |
| 559 | /* Exported control function */ |
| 560 | |
| 561 | enum ltt_control_msg { |
| 562 | LTT_CONTROL_START, |
| 563 | LTT_CONTROL_STOP, |
| 564 | LTT_CONTROL_CREATE_TRACE, |
| 565 | LTT_CONTROL_DESTROY_TRACE |
| 566 | }; |
| 567 | |
| 568 | union ltt_control_args { |
| 569 | struct { |
| 570 | enum trace_mode mode; |
| 571 | unsigned int subbuf_size_low; |
| 572 | unsigned int n_subbufs_low; |
| 573 | unsigned int subbuf_size_med; |
| 574 | unsigned int n_subbufs_med; |
| 575 | unsigned int subbuf_size_high; |
| 576 | unsigned int n_subbufs_high; |
| 577 | } new_trace; |
| 578 | }; |
| 579 | |
| 580 | int _ltt_trace_setup(const char *trace_name); |
| 581 | int ltt_trace_setup(const char *trace_name); |
| 582 | struct ltt_trace *_ltt_trace_find_setup(const char *trace_name); |
| 583 | int ltt_trace_set_type(const char *trace_name, const char *trace_type); |
| 584 | int ltt_trace_set_channel_subbufsize(const char *trace_name, |
| 585 | const char *channel_name, |
| 586 | unsigned int size); |
| 587 | int ltt_trace_set_channel_subbufcount(const char *trace_name, |
| 588 | const char *channel_name, |
| 589 | unsigned int cnt); |
| 590 | int ltt_trace_set_channel_switch_timer(const char *trace_name, |
| 591 | const char *channel_name, |
| 592 | unsigned long interval); |
| 593 | int ltt_trace_set_channel_enable(const char *trace_name, |
| 594 | const char *channel_name, |
| 595 | unsigned int enable); |
| 596 | int ltt_trace_set_channel_overwrite(const char *trace_name, |
| 597 | const char *channel_name, |
| 598 | unsigned int overwrite); |
| 599 | int ltt_trace_alloc(const char *trace_name); |
| 600 | int ltt_trace_destroy(const char *trace_name); |
| 601 | int ltt_trace_start(const char *trace_name); |
| 602 | int ltt_trace_stop(const char *trace_name); |
| 603 | |
| 604 | extern int ltt_control(enum ltt_control_msg msg, const char *trace_name, |
| 605 | const char *trace_type, union ltt_control_args args); |
| 606 | |
| 607 | enum ltt_filter_control_msg { |
| 608 | LTT_FILTER_DEFAULT_ACCEPT, |
| 609 | LTT_FILTER_DEFAULT_REJECT |
| 610 | }; |
| 611 | |
| 612 | extern int ltt_filter_control(enum ltt_filter_control_msg msg, |
| 613 | const char *trace_name); |
| 614 | |
| 615 | extern struct dentry *get_filter_root(void); |
| 616 | |
| 617 | void ltt_core_register(int (*function)(u8, void *)); |
| 618 | |
| 619 | void ltt_core_unregister(void); |
| 620 | |
| 621 | void ltt_release_trace(struct kref *kref); |
| 622 | void ltt_release_transport(struct kref *kref); |
| 623 | |
| 624 | extern int ltt_probe_register(struct ltt_available_probe *pdata); |
| 625 | extern int ltt_probe_unregister(struct ltt_available_probe *pdata); |
| 626 | extern int ltt_marker_connect(const char *channel, const char *mname, |
| 627 | const char *pname); |
| 628 | extern int ltt_marker_disconnect(const char *channel, const char *mname, |
| 629 | const char *pname); |
| 630 | extern void ltt_dump_marker_state(struct ltt_trace *trace); |
| 631 | |
| 632 | void ltt_lock_traces(void); |
| 633 | void ltt_unlock_traces(void); |
| 634 | |
| 635 | extern int ltt_ascii_create_dir(struct ltt_trace *new_trace); |
| 636 | extern void ltt_ascii_remove_dir(struct ltt_trace *trace); |
| 637 | extern int ltt_ascii_create(struct ltt_chan *chan); |
| 638 | extern void ltt_ascii_remove(struct ltt_chan *chan); |
| 639 | |
| 640 | extern |
| 641 | void ltt_statedump_register_kprobes_dump(void (*callback)(void *call_data)); |
| 642 | extern |
| 643 | void ltt_statedump_unregister_kprobes_dump(void (*callback)(void *call_data)); |
| 644 | |
| 645 | extern void ltt_dump_softirq_vec(void *call_data); |
| 646 | |
| 647 | #ifdef CONFIG_HAVE_LTT_DUMP_TABLES |
| 648 | extern void ltt_dump_sys_call_table(void *call_data); |
| 649 | extern void ltt_dump_idt_table(void *call_data); |
| 650 | #else |
| 651 | static inline void ltt_dump_sys_call_table(void *call_data) |
| 652 | { |
| 653 | } |
| 654 | |
| 655 | static inline void ltt_dump_idt_table(void *call_data) |
| 656 | { |
| 657 | } |
| 658 | #endif |
| 659 | |
| 660 | /* Relay IOCTL */ |
| 661 | |
| 662 | /* Get the next sub-buffer that can be read. */ |
| 663 | #define RELAY_GET_SB _IOR(0xF5, 0x00, __u32) |
| 664 | /* Release the oldest reserved (by "get") sub-buffer. */ |
| 665 | #define RELAY_PUT_SB _IOW(0xF5, 0x01, __u32) |
| 666 | /* returns the number of sub-buffers in the per cpu channel. */ |
| 667 | #define RELAY_GET_N_SB _IOR(0xF5, 0x02, __u32) |
| 668 | /* returns the size of the current sub-buffer. */ |
| 669 | #define RELAY_GET_SB_SIZE _IOR(0xF5, 0x03, __u32) |
| 670 | /* returns the maximum size for sub-buffers. */ |
| 671 | #define RELAY_GET_MAX_SB_SIZE _IOR(0xF5, 0x04, __u32) |
| 672 | |
| 673 | #endif /* _LTT_TRACER_H */ |