libtracing/tracer.h

   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
   7 #ifndef _LTT_TRACER_H
   8 #define _LTT_TRACER_H
   9
  10 //ust// #include <stdarg.h>
  11 //ust// #include <linux/types.h>
  12 //ust// #include <linux/limits.h>
  13 //ust// #include <linux/list.h>
  14 //ust// #include <linux/cache.h>
  15 //ust// #include <linux/kernel.h>
  16 //ust// #include <linux/timex.h>
  17 //ust// #include <linux/wait.h>
  18 //ust// #include <linux/ltt-relay.h>
  19 //ust// #include <linux/ltt-channels.h>
  20 //ust// #include <linux/ltt-core.h>
  21 //ust// #include <linux/marker.h>
  22 //ust// #include <linux/trace-clock.h>
  23 //ust// #include <asm/atomic.h>
  24 //ust// #include <asm/local.h>
  25 #include <sys/types.h>
  26 #include <stdarg.h>
  27 #include "relay.h"
  28 #include "list.h"
  29 #include "kernelcompat.h"
  30 #include "channels.h"
  31 #include "tracercore.h"
  32 #include "marker.h"
  33
  34 /* Number of bytes to log with a read/write event */
  35 #define LTT_LOG_RW_SIZE                 32L
  36
  37 /* Interval (in jiffies) at which the LTT per-CPU timer fires */
  38 #define LTT_PERCPU_TIMER_INTERVAL       1
  39
  40 #ifndef LTT_ARCH_TYPE
  41 #define LTT_ARCH_TYPE                   LTT_ARCH_TYPE_UNDEFINED
  42 #endif
  43
  44 #ifndef LTT_ARCH_VARIANT
  45 #define LTT_ARCH_VARIANT                LTT_ARCH_VARIANT_NONE
  46 #endif
  47
  48 struct ltt_active_marker;
  49
  50 /* Maximum number of callbacks per marker */
  51 #define LTT_NR_CALLBACKS        10
  52
  53 struct ltt_serialize_closure;
  54 struct ltt_probe_private_data;
  55
  56 /* Serialization callback '%k' */
  57 typedef size_t (*ltt_serialize_cb)(struct rchan_buf *buf, size_t buf_offset,
  58                         struct ltt_serialize_closure *closure,
  59                         void *serialize_private, int *largest_align,
  60                         const char *fmt, va_list *args);
  61
  62 struct ltt_serialize_closure {
  63         ltt_serialize_cb *callbacks;
  64         long cb_args[LTT_NR_CALLBACKS];
  65         unsigned int cb_idx;
  66 };
  67
  68 size_t ltt_serialize_data(struct rchan_buf *buf, size_t buf_offset,
  69                         struct ltt_serialize_closure *closure,
  70                         void *serialize_private,
  71                         int *largest_align, const char *fmt, va_list *args);
  72
  73 struct ltt_available_probe {
  74         const char *name;               /* probe name */
  75         const char *format;
  76         marker_probe_func *probe_func;
  77         ltt_serialize_cb callbacks[LTT_NR_CALLBACKS];
  78         struct list_head node;          /* registered probes list */
  79 };
  80
  81 struct ltt_probe_private_data {
  82         struct ltt_trace_struct *trace; /*
  83                                          * Target trace, for metadata
  84                                          * or statedump.
  85                                          */
  86         ltt_serialize_cb serializer;    /*
  87                                          * Serialization function override.
  88                                          */
  89         void *serialize_private;        /*
  90                                          * Private data for serialization
  91                                          * functions.
  92                                          */
  93 };
  94
  95 enum ltt_channels {
  96         LTT_CHANNEL_METADATA,
  97         LTT_CHANNEL_UST,
  98 };
  99
 100 struct ltt_active_marker {
 101         struct list_head node;          /* active markers list */
 102         const char *channel;
 103         const char *name;
 104         const char *format;
 105         struct ltt_available_probe *probe;
 106 };
 107
 108 struct marker; //ust//
 109 extern void ltt_vtrace(const struct marker *mdata, void *probe_data,
 110         void *call_data, const char *fmt, va_list *args);
 111 extern void ltt_trace(const struct marker *mdata, void *probe_data,
 112         void *call_data, const char *fmt, ...);
 113
 114 /*
 115  * Unique ID assigned to each registered probe.
 116  */
 117 enum marker_id {
 118         MARKER_ID_SET_MARKER_ID = 0,    /* Static IDs available (range 0-7) */
 119         MARKER_ID_SET_MARKER_FORMAT,
 120         MARKER_ID_COMPACT,              /* Compact IDs (range: 8-127)       */
 121         MARKER_ID_DYNAMIC,              /* Dynamic IDs (range: 128-65535)   */
 122 };
 123
 124 /* static ids 0-1 reserved for internal use. */
 125 #define MARKER_CORE_IDS         2
 126 static inline enum marker_id marker_id_type(uint16_t id)
 127 {
 128         if (id < MARKER_CORE_IDS)
 129                 return (enum marker_id)id;
 130         else
 131                 return MARKER_ID_DYNAMIC;
 132 }
 133
 134 //ust// #ifdef CONFIG_LTT
 135
 136 struct user_dbg_data {
 137         unsigned long avail_size;
 138         unsigned long write;
 139         unsigned long read;
 140 };
 141
 142 struct ltt_trace_ops {
 143         /* First 32 bytes cache-hot cacheline */
 144         int (*reserve_slot) (struct ltt_trace_struct *trace,
 145                                 struct ltt_channel_struct *channel,
 146                                 void **transport_data, size_t data_size,
 147                                 size_t *slot_size, long *buf_offset, u64 *tsc,
 148                                 unsigned int *rflags,
 149                                 int largest_align,
 150                                 int cpu);
 151         void (*commit_slot) (struct ltt_channel_struct *channel,
 152                                 void **transport_data, long buf_offset,
 153                                 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, int cpu);
 172 //ust// #ifdef CONFIG_HOTPLUG_CPU
 173 //ust//         int (*handle_cpuhp) (struct notifier_block *nb,
 174 //ust//                                 unsigned long action, void *hcpu,
 175 //ust//                                 struct ltt_trace_struct *trace);
 176 //ust// #endif
 177 } ____cacheline_aligned;
 178
 179 struct ltt_transport {
 180         char *name;
 181         struct module *owner;
 182         struct list_head node;
 183         struct ltt_trace_ops ops;
 184 };
 185
 186 enum trace_mode { LTT_TRACE_NORMAL, LTT_TRACE_FLIGHT, LTT_TRACE_HYBRID };
 187
 188 #define CHANNEL_FLAG_ENABLE     (1U<<0)
 189 #define CHANNEL_FLAG_OVERWRITE  (1U<<1)
 190
 191 /* Per-trace information - each trace/flight recorder represented by one */
 192 struct ltt_trace_struct {
 193         /* First 32 bytes cache-hot cacheline */
 194         struct list_head list;
 195         struct ltt_trace_ops *ops;
 196         int active;
 197         /* Second 32 bytes cache-hot cacheline */
 198         struct ltt_channel_struct *channels;
 199         unsigned int nr_channels;
 200         u32 freq_scale;
 201         u64 start_freq;
 202         u64 start_tsc;
 203         unsigned long long start_monotonic;
 204         struct timeval          start_time;
 205         struct ltt_channel_setting *settings;
 206         struct {
 207                 struct dentry                   *trace_root;
 208         } dentry;
 209 //ust// struct rchan_callbacks callbacks;
 210         struct kref kref; /* Each channel has a kref of the trace struct */
 211         struct ltt_transport *transport;
 212         struct kref ltt_transport_kref;
 213 //ust// wait_queue_head_t kref_wq; /* Place for ltt_trace_destroy to sleep */
 214         char trace_name[NAME_MAX];
 215 } ____cacheline_aligned;
 216
 217 /* Hardcoded event headers
 218  *
 219  * event header for a trace with active heartbeat : 27 bits timestamps
 220  *
 221  * headers are 32-bits aligned. In order to insure such alignment, a dynamic per
 222  * trace alignment value must be done.
 223  *
 224  * Remember that the C compiler does align each member on the boundary
 225  * equivalent to their own size.
 226  *
 227  * As relay subbuffers are aligned on pages, we are sure that they are 4 and 8
 228  * bytes aligned, so the buffer header and trace header are aligned.
 229  *
 230  * Event headers are aligned depending on the trace alignment option.
 231  *
 232  * Note using C structure bitfields for cross-endianness and portability
 233  * concerns.
 234  */
 235
 236 #define LTT_RESERVED_EVENTS     3
 237 #define LTT_EVENT_BITS          5
 238 #define LTT_FREE_EVENTS         ((1 << LTT_EVENT_BITS) - LTT_RESERVED_EVENTS)
 239 #define LTT_TSC_BITS            27
 240 #define LTT_TSC_MASK            ((1 << LTT_TSC_BITS) - 1)
 241
 242 struct ltt_event_header {
 243         u32 id_time;            /* 5 bits event id (MSB); 27 bits time (LSB) */
 244 };
 245
 246 /* Reservation flags */
 247 #define LTT_RFLAG_ID                    (1 << 0)
 248 #define LTT_RFLAG_ID_SIZE               (1 << 1)
 249 #define LTT_RFLAG_ID_SIZE_TSC           (1 << 2)
 250
 251 /*
 252  * We use asm/timex.h : cpu_khz/HZ variable in here : we might have to deal
 253  * specifically with CPU frequency scaling someday, so using an interpolation
 254  * between the start and end of buffer values is not flexible enough. Using an
 255  * immediate frequency value permits to calculate directly the times for parts
 256  * of a buffer that would be before a frequency change.
 257  *
 258  * Keep the natural field alignment for _each field_ within this structure if
 259  * you ever add/remove a field from this header. Packed attribute is not used
 260  * because gcc generates poor code on at least powerpc and mips. Don't ever
 261  * let gcc add padding between the structure elements.
 262  */
 263 struct ltt_subbuffer_header {
 264         uint64_t cycle_count_begin;     /* Cycle count at subbuffer start */
 265         uint64_t cycle_count_end;       /* Cycle count at subbuffer end */
 266         uint32_t magic_number;          /*
 267                                          * Trace magic number.
 268                                          * contains endianness information.
 269                                          */
 270         uint8_t major_version;
 271         uint8_t minor_version;
 272         uint8_t arch_size;              /* Architecture pointer size */
 273         uint8_t alignment;              /* LTT data alignment */
 274         uint64_t start_time_sec;        /* NTP-corrected start time */
 275         uint64_t start_time_usec;
 276         uint64_t start_freq;            /*
 277                                          * Frequency at trace start,
 278                                          * used all along the trace.
 279                                          */
 280         uint32_t freq_scale;            /* Frequency scaling (divisor) */
 281         uint32_t lost_size;             /* Size unused at end of subbuffer */
 282         uint32_t buf_size;              /* Size of this subbuffer */
 283         uint32_t events_lost;           /*
 284                                          * Events lost in this subbuffer since
 285                                          * the beginning of the trace.
 286                                          * (may overflow)
 287                                          */
 288         uint32_t subbuf_corrupt;        /*
 289                                          * Corrupted (lost) subbuffers since
 290                                          * the begginig of the trace.
 291                                          * (may overflow)
 292                                          */
 293         uint8_t header_end[0];          /* End of header */
 294 };
 295
 296 /**
 297  * ltt_subbuffer_header_size - called on buffer-switch to a new sub-buffer
 298  *
 299  * Return header size without padding after the structure. Don't use packed
 300  * structure because gcc generates inefficient code on some architectures
 301  * (powerpc, mips..)
 302  */
 303 static inline size_t ltt_subbuffer_header_size(void)
 304 {
 305         return offsetof(struct ltt_subbuffer_header, header_end);
 306 }
 307
 308 /*
 309  * ltt_get_header_size
 310  *
 311  * Calculate alignment offset to 32-bits. This is the alignment offset of the
 312  * event header.
 313  *
 314  * Important note :
 315  * The event header must be 32-bits. The total offset calculated here :
 316  *
 317  * Alignment of header struct on 32 bits (min arch size, header size)
 318  * + sizeof(header struct)  (32-bits)
 319  * + (opt) u16 (ext. event id)
 320  * + (opt) u16 (event_size) (if event_size == 0xFFFFUL, has ext. event size)
 321  * + (opt) u32 (ext. event size)
 322  * + (opt) u64 full TSC (aligned on min(64-bits, arch size))
 323  *
 324  * The payload must itself determine its own alignment from the biggest type it
 325  * contains.
 326  * */
 327 static inline unsigned char ltt_get_header_size(
 328                 struct ltt_channel_struct *channel,
 329                 size_t offset,
 330                 size_t data_size,
 331                 size_t *before_hdr_pad,
 332                 unsigned int rflags)
 333 {
 334         size_t orig_offset = offset;
 335         size_t padding;
 336
 337 //ust// BUILD_BUG_ON(sizeof(struct ltt_event_header) != sizeof(u32));
 338
 339         padding = ltt_align(offset, sizeof(struct ltt_event_header));
 340         offset += padding;
 341         offset += sizeof(struct ltt_event_header);
 342
 343         switch (rflags) {
 344         case LTT_RFLAG_ID_SIZE_TSC:
 345                 offset += sizeof(u16) + sizeof(u16);
 346                 if (data_size >= 0xFFFFU)
 347                         offset += sizeof(u32);
 348                 offset += ltt_align(offset, sizeof(u64));
 349                 offset += sizeof(u64);
 350                 break;
 351         case LTT_RFLAG_ID_SIZE:
 352                 offset += sizeof(u16) + sizeof(u16);
 353                 if (data_size >= 0xFFFFU)
 354                         offset += sizeof(u32);
 355                 break;
 356         case LTT_RFLAG_ID:
 357                 offset += sizeof(u16);
 358                 break;
 359         }
 360
 361         *before_hdr_pad = padding;
 362         return offset - orig_offset;
 363 }
 364
 365 /*
 366  * ltt_write_event_header
 367  *
 368  * Writes the event header to the offset (already aligned on 32-bits).
 369  *
 370  * @trace : trace to write to.
 371  * @channel : pointer to the channel structure..
 372  * @buf : buffer to write to.
 373  * @buf_offset : buffer offset to write to (aligned on 32 bits).
 374  * @eID : event ID
 375  * @event_size : size of the event, excluding the event header.
 376  * @tsc : time stamp counter.
 377  * @rflags : reservation flags.
 378  *
 379  * returns : offset where the event data must be written.
 380  */
 381 static inline size_t ltt_write_event_header(struct ltt_trace_struct *trace,
 382                 struct ltt_channel_struct *channel,
 383                 struct rchan_buf *buf, long buf_offset,
 384                 u16 eID, size_t event_size,
 385                 u64 tsc, unsigned int rflags)
 386 {
 387         struct ltt_event_header header;
 388         size_t small_size;
 389
 390         switch (rflags) {
 391         case LTT_RFLAG_ID_SIZE_TSC:
 392                 header.id_time = 29 << LTT_TSC_BITS;
 393                 break;
 394         case LTT_RFLAG_ID_SIZE:
 395                 header.id_time = 30 << LTT_TSC_BITS;
 396                 break;
 397         case LTT_RFLAG_ID:
 398                 header.id_time = 31 << LTT_TSC_BITS;
 399                 break;
 400         default:
 401                 header.id_time = eID << LTT_TSC_BITS;
 402                 break;
 403         }
 404         header.id_time |= (u32)tsc & LTT_TSC_MASK;
 405         ltt_relay_write(buf, buf_offset, &header, sizeof(header));
 406         buf_offset += sizeof(header);
 407
 408         switch (rflags) {
 409         case LTT_RFLAG_ID_SIZE_TSC:
 410                 small_size = min_t(size_t, event_size, 0xFFFFU);
 411                 ltt_relay_write(buf, buf_offset,
 412                         (u16[]){ (u16)eID }, sizeof(u16));
 413                 buf_offset += sizeof(u16);
 414                 ltt_relay_write(buf, buf_offset,
 415                         (u16[]){ (u16)small_size }, sizeof(u16));
 416                 buf_offset += sizeof(u16);
 417                 if (small_size == 0xFFFFU) {
 418                         ltt_relay_write(buf, buf_offset,
 419                                 (u32[]){ (u32)event_size }, sizeof(u32));
 420                         buf_offset += sizeof(u32);
 421                 }
 422                 buf_offset += ltt_align(buf_offset, sizeof(u64));
 423                 ltt_relay_write(buf, buf_offset,
 424                         (u64[]){ (u64)tsc }, sizeof(u64));
 425                 buf_offset += sizeof(u64);
 426                 break;
 427         case LTT_RFLAG_ID_SIZE:
 428                 small_size = min_t(size_t, event_size, 0xFFFFU);
 429                 ltt_relay_write(buf, buf_offset,
 430                         (u16[]){ (u16)eID }, sizeof(u16));
 431                 buf_offset += sizeof(u16);
 432                 ltt_relay_write(buf, buf_offset,
 433                         (u16[]){ (u16)small_size }, sizeof(u16));
 434                 buf_offset += sizeof(u16);
 435                 if (small_size == 0xFFFFU) {
 436                         ltt_relay_write(buf, buf_offset,
 437                                 (u32[]){ (u32)event_size }, sizeof(u32));
 438                         buf_offset += sizeof(u32);
 439                 }
 440                 break;
 441         case LTT_RFLAG_ID:
 442                 ltt_relay_write(buf, buf_offset,
 443                         (u16[]){ (u16)eID }, sizeof(u16));
 444                 buf_offset += sizeof(u16);
 445                 break;
 446         default:
 447                 break;
 448         }
 449
 450         return buf_offset;
 451 }
 452
 453 /* Lockless LTTng */
 454
 455 /* Buffer offset macros */
 456
 457 /*
 458  * BUFFER_TRUNC zeroes the subbuffer offset and the subbuffer number parts of
 459  * the offset, which leaves only the buffer number.
 460  */
 461 #define BUFFER_TRUNC(offset, chan) \
 462         ((offset) & (~((chan)->alloc_size-1)))
 463 #define BUFFER_OFFSET(offset, chan) ((offset) & ((chan)->alloc_size - 1))
 464 #define SUBBUF_OFFSET(offset, chan) ((offset) & ((chan)->subbuf_size - 1))
 465 #define SUBBUF_ALIGN(offset, chan) \
 466         (((offset) + (chan)->subbuf_size) & (~((chan)->subbuf_size - 1)))
 467 #define SUBBUF_TRUNC(offset, chan) \
 468         ((offset) & (~((chan)->subbuf_size - 1)))
 469 #define SUBBUF_INDEX(offset, chan) \
 470         (BUFFER_OFFSET((offset), chan) >> (chan)->subbuf_size_order)
 471
 472 /*
 473  * ltt_reserve_slot
 474  *
 475  * Atomic slot reservation in a LTTng buffer. It will take care of
 476  * sub-buffer switching.
 477  *
 478  * Parameters:
 479  *
 480  * @trace : the trace structure to log to.
 481  * @channel : the chanel to reserve space into.
 482  * @transport_data : specific transport data.
 483  * @data_size : size of the variable length data to log.
 484  * @slot_size : pointer to total size of the slot (out)
 485  * @buf_offset : pointer to reserve offset (out)
 486  * @tsc : pointer to the tsc at the slot reservation (out)
 487  * @rflags : reservation flags (header specificity)
 488  * @cpu : cpu id
 489  *
 490  * Return : -ENOSPC if not enough space, else 0.
 491  */
 492 static inline int ltt_reserve_slot(
 493                 struct ltt_trace_struct *trace,
 494                 struct ltt_channel_struct *channel,
 495                 void **transport_data,
 496                 size_t data_size,
 497                 size_t *slot_size,
 498                 long *buf_offset,
 499                 u64 *tsc,
 500                 unsigned int *rflags,
 501                 int largest_align,
 502                 int cpu)
 503 {
 504         return trace->ops->reserve_slot(trace, channel, transport_data,
 505                         data_size, slot_size, buf_offset, tsc, rflags,
 506                         largest_align, cpu);
 507 }
 508
 509
 510 /*
 511  * ltt_commit_slot
 512  *
 513  * Atomic unordered slot commit. Increments the commit count in the
 514  * specified sub-buffer, and delivers it if necessary.
 515  *
 516  * Parameters:
 517  *
 518  * @channel : the chanel to reserve space into.
 519  * @transport_data : specific transport data.
 520  * @buf_offset : offset of beginning of reserved slot
 521  * @slot_size : size of the reserved slot.
 522  */
 523 static inline void ltt_commit_slot(
 524                 struct ltt_channel_struct *channel,
 525                 void **transport_data,
 526                 long buf_offset,
 527                 size_t slot_size)
 528 {
 529         struct ltt_trace_struct *trace = channel->trace;
 530
 531         trace->ops->commit_slot(channel, transport_data, buf_offset, slot_size);
 532 }
 533
 534 /*
 535  * Control channels :
 536  * control/metadata
 537  * control/interrupts
 538  * control/...
 539  *
 540  * cpu channel :
 541  * cpu
 542  */
 543 //ust// #define LTT_RELAY_ROOT          "ltt"
 544 //ust// #define LTT_RELAY_LOCKED_ROOT   "ltt-locked"
 545
 546 #define LTT_METADATA_CHANNEL            "metadata_state"
 547 #define LTT_UST_CHANNEL                 "ust"
 548
 549 #define LTT_FLIGHT_PREFIX       "flight-"
 550
 551 /* Tracer properties */
 552 #define LTT_DEFAULT_SUBBUF_SIZE_LOW     65536
 553 #define LTT_DEFAULT_N_SUBBUFS_LOW       2
 554 #define LTT_DEFAULT_SUBBUF_SIZE_MED     262144
 555 #define LTT_DEFAULT_N_SUBBUFS_MED       2
 556 #define LTT_DEFAULT_SUBBUF_SIZE_HIGH    1048576
 557 #define LTT_DEFAULT_N_SUBBUFS_HIGH      2
 558 #define LTT_TRACER_MAGIC_NUMBER         0x00D6B7ED
 559 #define LTT_TRACER_VERSION_MAJOR        2
 560 #define LTT_TRACER_VERSION_MINOR        3
 561
 562 /*
 563  * Size reserved for high priority events (interrupts, NMI, BH) at the end of a
 564  * nearly full buffer. User space won't use this last amount of space when in
 565  * blocking mode. This space also includes the event header that would be
 566  * written by this user space event.
 567  */
 568 #define LTT_RESERVE_CRITICAL            4096
 569
 570 /* Register and unregister function pointers */
 571
 572 enum ltt_module_function {
 573         LTT_FUNCTION_RUN_FILTER,
 574         LTT_FUNCTION_FILTER_CONTROL,
 575         LTT_FUNCTION_STATEDUMP
 576 };
 577
 578 //ust// extern int ltt_module_register(enum ltt_module_function name, void *function,
 579 //ust//                 struct module *owner);
 580 //ust// extern void ltt_module_unregister(enum ltt_module_function name);
 581
 582 void ltt_transport_register(struct ltt_transport *transport);
 583 void ltt_transport_unregister(struct ltt_transport *transport);
 584
 585 /* Exported control function */
 586
 587 //ust// enum ltt_control_msg {
 588 //ust//         LTT_CONTROL_START,
 589 //ust//         LTT_CONTROL_STOP,
 590 //ust//         LTT_CONTROL_CREATE_TRACE,
 591 //ust//         LTT_CONTROL_DESTROY_TRACE
 592 //ust// };
 593
 594 union ltt_control_args {
 595         struct {
 596                 enum trace_mode mode;
 597                 unsigned int subbuf_size_low;
 598                 unsigned int n_subbufs_low;
 599                 unsigned int subbuf_size_med;
 600                 unsigned int n_subbufs_med;
 601                 unsigned int subbuf_size_high;
 602                 unsigned int n_subbufs_high;
 603         } new_trace;
 604 };
 605
 606 int _ltt_trace_setup(const char *trace_name);
 607 int ltt_trace_setup(const char *trace_name);
 608 struct ltt_trace_struct *_ltt_trace_find_setup(const char *trace_name);
 609 int ltt_trace_set_type(const char *trace_name, const char *trace_type);
 610 int ltt_trace_set_channel_subbufsize(const char *trace_name,
 611                 const char *channel_name, unsigned int size);
 612 int ltt_trace_set_channel_subbufcount(const char *trace_name,
 613                 const char *channel_name, unsigned int cnt);
 614 int ltt_trace_set_channel_enable(const char *trace_name,
 615                 const char *channel_name, unsigned int enable);
 616 int ltt_trace_set_channel_overwrite(const char *trace_name,
 617                 const char *channel_name, unsigned int overwrite);
 618 int ltt_trace_alloc(const char *trace_name);
 619 int ltt_trace_destroy(const char *trace_name);
 620 int ltt_trace_start(const char *trace_name);
 621 int ltt_trace_stop(const char *trace_name);
 622
 623 //ust// extern int ltt_control(enum ltt_control_msg msg, const char *trace_name,
 624 //ust//                 const char *trace_type, union ltt_control_args args);
 625
 626 enum ltt_filter_control_msg {
 627         LTT_FILTER_DEFAULT_ACCEPT,
 628         LTT_FILTER_DEFAULT_REJECT
 629 };
 630
 631 extern int ltt_filter_control(enum ltt_filter_control_msg msg,
 632                 const char *trace_name);
 633
 634 extern struct dentry *get_filter_root(void);
 635
 636 void ltt_write_trace_header(struct ltt_trace_struct *trace,
 637                 struct ltt_subbuffer_header *header);
 638 extern void ltt_buffer_destroy(struct ltt_channel_struct *ltt_chan);
 639
 640 void ltt_core_register(int (*function)(u8, void *));
 641
 642 void ltt_core_unregister(void);
 643
 644 void ltt_release_trace(struct kref *kref);
 645 void ltt_release_transport(struct kref *kref);
 646
 647 extern int ltt_probe_register(struct ltt_available_probe *pdata);
 648 extern int ltt_probe_unregister(struct ltt_available_probe *pdata);
 649 extern int ltt_marker_connect(const char *channel, const char *mname,
 650                 const char *pname);
 651 extern int ltt_marker_disconnect(const char *channel, const char *mname,
 652                 const char *pname);
 653 extern void ltt_dump_marker_state(struct ltt_trace_struct *trace);
 654
 655 void ltt_lock_traces(void);
 656 void ltt_unlock_traces(void);
 657
 658 //ust// extern void ltt_dump_softirq_vec(void *call_data);
 659 //ust//
 660 //ust// #ifdef CONFIG_HAVE_LTT_DUMP_TABLES
 661 //ust// extern void ltt_dump_sys_call_table(void *call_data);
 662 //ust// extern void ltt_dump_idt_table(void *call_data);
 663 //ust// #else
 664 //ust// static inline void ltt_dump_sys_call_table(void *call_data)
 665 //ust// {
 666 //ust// }
 667 //ust//
 668 //ust// static inline void ltt_dump_idt_table(void *call_data)
 669 //ust// {
 670 //ust// }
 671 //ust// #endif
 672
 673 //ust// #ifdef CONFIG_LTT_KPROBES
 674 //ust// extern void ltt_dump_kprobes_table(void *call_data);
 675 //ust// #else
 676 //ust// static inline void ltt_dump_kprobes_table(void *call_data)
 677 //ust// {
 678 //ust// }
 679 //ust// #endif
 680
 681 //ust// /* Relay IOCTL */
 682 //ust//
 683 //ust// /* Get the next sub buffer that can be read. */
 684 //ust// #define RELAY_GET_SUBBUF                _IOR(0xF5, 0x00, __u32)
 685 //ust// /* Release the oldest reserved (by "get") sub buffer. */
 686 //ust// #define RELAY_PUT_SUBBUF                _IOW(0xF5, 0x01, __u32)
 687 //ust// /* returns the number of sub buffers in the per cpu channel. */
 688 //ust// #define RELAY_GET_N_SUBBUFS             _IOR(0xF5, 0x02, __u32)
 689 //ust// /* returns the size of the sub buffers. */
 690 //ust// #define RELAY_GET_SUBBUF_SIZE           _IOR(0xF5, 0x03, __u32)
 691
 692 //ust// #endif /* CONFIG_LTT */
 693
 694 #endif /* _LTT_TRACER_H */