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9dad1eb8 PMF |
1 | /* |
2 | * Copyright (C) 2005,2006,2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) | |
e4621c7f | 3 | * Copyright (C) 2009 Pierre-Marc Fournier |
9dad1eb8 PMF |
4 | * |
5 | * This contains the definitions for the Linux Trace Toolkit tracer. | |
e4621c7f PMF |
6 | * |
7 | * Ported to userspace by Pierre-Marc Fournier. | |
8 | * | |
8fc2d8db PMF |
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 | |
9dad1eb8 PMF |
22 | */ |
23 | ||
24 | #ifndef _LTT_TRACER_H | |
25 | #define _LTT_TRACER_H | |
26 | ||
b6bf28ec | 27 | #include <sys/types.h> |
9dad1eb8 | 28 | #include <stdarg.h> |
769d0157 | 29 | //#include "list.h" |
fbca6b62 | 30 | #include <ust/kernelcompat.h> |
b5b073e2 | 31 | #include "buffers.h" |
b6bf28ec | 32 | #include "channels.h" |
bb07823d | 33 | #include "tracercore.h" |
93d0f2ea | 34 | #include <ust/marker.h> |
822f167a | 35 | #include <ust/probe.h> |
9dad1eb8 PMF |
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 | ||
9dad1eb8 PMF |
59 | struct ltt_serialize_closure { |
60 | ltt_serialize_cb *callbacks; | |
61 | long cb_args[LTT_NR_CALLBACKS]; | |
62 | unsigned int cb_idx; | |
63 | }; | |
64 | ||
b5b073e2 | 65 | extern size_t ltt_serialize_data(struct ust_buffer *buf, size_t buf_offset, |
9dad1eb8 PMF |
66 | struct ltt_serialize_closure *closure, |
67 | void *serialize_private, | |
68 | int *largest_align, const char *fmt, va_list *args); | |
69 | ||
9dad1eb8 PMF |
70 | struct ltt_probe_private_data { |
71 | struct ltt_trace_struct *trace; /* | |
72 | * Target trace, for metadata | |
73 | * or statedump. | |
74 | */ | |
75 | ltt_serialize_cb serializer; /* | |
76 | * Serialization function override. | |
77 | */ | |
78 | void *serialize_private; /* | |
79 | * Private data for serialization | |
80 | * functions. | |
81 | */ | |
82 | }; | |
83 | ||
84 | enum ltt_channels { | |
85 | LTT_CHANNEL_METADATA, | |
b6bf28ec | 86 | LTT_CHANNEL_UST, |
9dad1eb8 PMF |
87 | }; |
88 | ||
89 | struct ltt_active_marker { | |
90 | struct list_head node; /* active markers list */ | |
91 | const char *channel; | |
92 | const char *name; | |
93 | const char *format; | |
94 | struct ltt_available_probe *probe; | |
95 | }; | |
96 | ||
b6bf28ec | 97 | struct marker; //ust// |
9dad1eb8 | 98 | extern void ltt_vtrace(const struct marker *mdata, void *probe_data, |
75667d04 | 99 | struct registers *regs, void *call_data, const char *fmt, va_list *args); |
9dad1eb8 | 100 | extern void ltt_trace(const struct marker *mdata, void *probe_data, |
75667d04 | 101 | struct registers *regs, void *call_data, const char *fmt, ...); |
9dad1eb8 PMF |
102 | |
103 | /* | |
104 | * Unique ID assigned to each registered probe. | |
105 | */ | |
106 | enum marker_id { | |
107 | MARKER_ID_SET_MARKER_ID = 0, /* Static IDs available (range 0-7) */ | |
108 | MARKER_ID_SET_MARKER_FORMAT, | |
109 | MARKER_ID_COMPACT, /* Compact IDs (range: 8-127) */ | |
110 | MARKER_ID_DYNAMIC, /* Dynamic IDs (range: 128-65535) */ | |
111 | }; | |
112 | ||
113 | /* static ids 0-1 reserved for internal use. */ | |
114 | #define MARKER_CORE_IDS 2 | |
a2fd50ef | 115 | static __inline__ enum marker_id marker_id_type(uint16_t id) |
9dad1eb8 PMF |
116 | { |
117 | if (id < MARKER_CORE_IDS) | |
118 | return (enum marker_id)id; | |
119 | else | |
120 | return MARKER_ID_DYNAMIC; | |
121 | } | |
122 | ||
9dad1eb8 PMF |
123 | struct user_dbg_data { |
124 | unsigned long avail_size; | |
125 | unsigned long write; | |
126 | unsigned long read; | |
127 | }; | |
128 | ||
129 | struct ltt_trace_ops { | |
130 | /* First 32 bytes cache-hot cacheline */ | |
131 | int (*reserve_slot) (struct ltt_trace_struct *trace, | |
b5b073e2 | 132 | struct ust_channel *channel, |
9dad1eb8 PMF |
133 | void **transport_data, size_t data_size, |
134 | size_t *slot_size, long *buf_offset, u64 *tsc, | |
135 | unsigned int *rflags, | |
c1dea0b3 | 136 | int largest_align); |
8431032f PMF |
137 | //ust// void (*commit_slot) (struct ltt_channel_struct *channel, |
138 | //ust// void **transport_data, long buf_offset, | |
139 | //ust// size_t slot_size); | |
b5b073e2 | 140 | void (*wakeup_channel) (struct ust_channel *channel); |
bb07823d PMF |
141 | int (*user_blocking) (struct ltt_trace_struct *trace, |
142 | unsigned int index, size_t data_size, | |
143 | struct user_dbg_data *dbg); | |
b5b073e2 PMF |
144 | /* End of first 32 bytes cacheline */ |
145 | int (*create_dirs) (struct ltt_trace_struct *new_trace); | |
146 | void (*remove_dirs) (struct ltt_trace_struct *new_trace); | |
147 | int (*create_channel) (const char *trace_name, | |
148 | struct ltt_trace_struct *trace, | |
149 | const char *channel_name, | |
150 | struct ust_channel *channel, | |
151 | unsigned int subbuf_size, | |
152 | unsigned int n_subbufs, int overwrite); | |
153 | void (*finish_channel) (struct ust_channel *channel); | |
154 | void (*remove_channel) (struct ust_channel *channel); | |
155 | void (*user_errors) (struct ltt_trace_struct *trace, | |
156 | unsigned int index, size_t data_size, | |
157 | struct user_dbg_data *dbg); | |
9dad1eb8 PMF |
158 | } ____cacheline_aligned; |
159 | ||
160 | struct ltt_transport { | |
161 | char *name; | |
162 | struct module *owner; | |
163 | struct list_head node; | |
164 | struct ltt_trace_ops ops; | |
165 | }; | |
166 | ||
167 | enum trace_mode { LTT_TRACE_NORMAL, LTT_TRACE_FLIGHT, LTT_TRACE_HYBRID }; | |
168 | ||
169 | #define CHANNEL_FLAG_ENABLE (1U<<0) | |
170 | #define CHANNEL_FLAG_OVERWRITE (1U<<1) | |
171 | ||
172 | /* Per-trace information - each trace/flight recorder represented by one */ | |
173 | struct ltt_trace_struct { | |
174 | /* First 32 bytes cache-hot cacheline */ | |
175 | struct list_head list; | |
176 | struct ltt_trace_ops *ops; | |
177 | int active; | |
178 | /* Second 32 bytes cache-hot cacheline */ | |
b5b073e2 | 179 | struct ust_channel *channels; |
9dad1eb8 PMF |
180 | unsigned int nr_channels; |
181 | u32 freq_scale; | |
182 | u64 start_freq; | |
183 | u64 start_tsc; | |
184 | unsigned long long start_monotonic; | |
185 | struct timeval start_time; | |
186 | struct ltt_channel_setting *settings; | |
187 | struct { | |
188 | struct dentry *trace_root; | |
189 | } dentry; | |
9dad1eb8 PMF |
190 | struct kref kref; /* Each channel has a kref of the trace struct */ |
191 | struct ltt_transport *transport; | |
192 | struct kref ltt_transport_kref; | |
9dad1eb8 PMF |
193 | char trace_name[NAME_MAX]; |
194 | } ____cacheline_aligned; | |
195 | ||
196 | /* Hardcoded event headers | |
197 | * | |
198 | * event header for a trace with active heartbeat : 27 bits timestamps | |
199 | * | |
200 | * headers are 32-bits aligned. In order to insure such alignment, a dynamic per | |
201 | * trace alignment value must be done. | |
202 | * | |
203 | * Remember that the C compiler does align each member on the boundary | |
204 | * equivalent to their own size. | |
205 | * | |
206 | * As relay subbuffers are aligned on pages, we are sure that they are 4 and 8 | |
207 | * bytes aligned, so the buffer header and trace header are aligned. | |
208 | * | |
209 | * Event headers are aligned depending on the trace alignment option. | |
210 | * | |
211 | * Note using C structure bitfields for cross-endianness and portability | |
212 | * concerns. | |
213 | */ | |
214 | ||
215 | #define LTT_RESERVED_EVENTS 3 | |
216 | #define LTT_EVENT_BITS 5 | |
217 | #define LTT_FREE_EVENTS ((1 << LTT_EVENT_BITS) - LTT_RESERVED_EVENTS) | |
218 | #define LTT_TSC_BITS 27 | |
219 | #define LTT_TSC_MASK ((1 << LTT_TSC_BITS) - 1) | |
220 | ||
221 | struct ltt_event_header { | |
222 | u32 id_time; /* 5 bits event id (MSB); 27 bits time (LSB) */ | |
223 | }; | |
224 | ||
225 | /* Reservation flags */ | |
226 | #define LTT_RFLAG_ID (1 << 0) | |
227 | #define LTT_RFLAG_ID_SIZE (1 << 1) | |
228 | #define LTT_RFLAG_ID_SIZE_TSC (1 << 2) | |
229 | ||
230 | /* | |
231 | * We use asm/timex.h : cpu_khz/HZ variable in here : we might have to deal | |
232 | * specifically with CPU frequency scaling someday, so using an interpolation | |
233 | * between the start and end of buffer values is not flexible enough. Using an | |
234 | * immediate frequency value permits to calculate directly the times for parts | |
235 | * of a buffer that would be before a frequency change. | |
236 | * | |
237 | * Keep the natural field alignment for _each field_ within this structure if | |
238 | * you ever add/remove a field from this header. Packed attribute is not used | |
239 | * because gcc generates poor code on at least powerpc and mips. Don't ever | |
240 | * let gcc add padding between the structure elements. | |
241 | */ | |
242 | struct ltt_subbuffer_header { | |
243 | uint64_t cycle_count_begin; /* Cycle count at subbuffer start */ | |
244 | uint64_t cycle_count_end; /* Cycle count at subbuffer end */ | |
245 | uint32_t magic_number; /* | |
246 | * Trace magic number. | |
247 | * contains endianness information. | |
248 | */ | |
249 | uint8_t major_version; | |
250 | uint8_t minor_version; | |
251 | uint8_t arch_size; /* Architecture pointer size */ | |
252 | uint8_t alignment; /* LTT data alignment */ | |
253 | uint64_t start_time_sec; /* NTP-corrected start time */ | |
254 | uint64_t start_time_usec; | |
255 | uint64_t start_freq; /* | |
256 | * Frequency at trace start, | |
257 | * used all along the trace. | |
258 | */ | |
259 | uint32_t freq_scale; /* Frequency scaling (divisor) */ | |
260 | uint32_t lost_size; /* Size unused at end of subbuffer */ | |
261 | uint32_t buf_size; /* Size of this subbuffer */ | |
262 | uint32_t events_lost; /* | |
263 | * Events lost in this subbuffer since | |
264 | * the beginning of the trace. | |
265 | * (may overflow) | |
266 | */ | |
267 | uint32_t subbuf_corrupt; /* | |
268 | * Corrupted (lost) subbuffers since | |
269 | * the begginig of the trace. | |
270 | * (may overflow) | |
271 | */ | |
272 | uint8_t header_end[0]; /* End of header */ | |
273 | }; | |
274 | ||
275 | /** | |
276 | * ltt_subbuffer_header_size - called on buffer-switch to a new sub-buffer | |
277 | * | |
278 | * Return header size without padding after the structure. Don't use packed | |
279 | * structure because gcc generates inefficient code on some architectures | |
280 | * (powerpc, mips..) | |
281 | */ | |
a2fd50ef | 282 | static __inline__ size_t ltt_subbuffer_header_size(void) |
9dad1eb8 PMF |
283 | { |
284 | return offsetof(struct ltt_subbuffer_header, header_end); | |
285 | } | |
286 | ||
287 | /* | |
b5b073e2 | 288 | * ust_get_header_size |
9dad1eb8 PMF |
289 | * |
290 | * Calculate alignment offset to 32-bits. This is the alignment offset of the | |
291 | * event header. | |
292 | * | |
293 | * Important note : | |
294 | * The event header must be 32-bits. The total offset calculated here : | |
295 | * | |
296 | * Alignment of header struct on 32 bits (min arch size, header size) | |
297 | * + sizeof(header struct) (32-bits) | |
298 | * + (opt) u16 (ext. event id) | |
299 | * + (opt) u16 (event_size) (if event_size == 0xFFFFUL, has ext. event size) | |
300 | * + (opt) u32 (ext. event size) | |
301 | * + (opt) u64 full TSC (aligned on min(64-bits, arch size)) | |
302 | * | |
303 | * The payload must itself determine its own alignment from the biggest type it | |
304 | * contains. | |
305 | * */ | |
a2fd50ef | 306 | static __inline__ unsigned char ust_get_header_size( |
b5b073e2 | 307 | struct ust_channel *channel, |
9dad1eb8 PMF |
308 | size_t offset, |
309 | size_t data_size, | |
310 | size_t *before_hdr_pad, | |
311 | unsigned int rflags) | |
312 | { | |
313 | size_t orig_offset = offset; | |
314 | size_t padding; | |
315 | ||
9dad1eb8 PMF |
316 | padding = ltt_align(offset, sizeof(struct ltt_event_header)); |
317 | offset += padding; | |
318 | offset += sizeof(struct ltt_event_header); | |
319 | ||
320 | switch (rflags) { | |
321 | case LTT_RFLAG_ID_SIZE_TSC: | |
322 | offset += sizeof(u16) + sizeof(u16); | |
323 | if (data_size >= 0xFFFFU) | |
324 | offset += sizeof(u32); | |
325 | offset += ltt_align(offset, sizeof(u64)); | |
326 | offset += sizeof(u64); | |
327 | break; | |
328 | case LTT_RFLAG_ID_SIZE: | |
329 | offset += sizeof(u16) + sizeof(u16); | |
330 | if (data_size >= 0xFFFFU) | |
331 | offset += sizeof(u32); | |
332 | break; | |
333 | case LTT_RFLAG_ID: | |
334 | offset += sizeof(u16); | |
335 | break; | |
336 | } | |
337 | ||
338 | *before_hdr_pad = padding; | |
339 | return offset - orig_offset; | |
340 | } | |
341 | ||
342 | /* | |
343 | * ltt_write_event_header | |
344 | * | |
345 | * Writes the event header to the offset (already aligned on 32-bits). | |
346 | * | |
347 | * @trace : trace to write to. | |
348 | * @channel : pointer to the channel structure.. | |
349 | * @buf : buffer to write to. | |
350 | * @buf_offset : buffer offset to write to (aligned on 32 bits). | |
351 | * @eID : event ID | |
352 | * @event_size : size of the event, excluding the event header. | |
353 | * @tsc : time stamp counter. | |
354 | * @rflags : reservation flags. | |
355 | * | |
356 | * returns : offset where the event data must be written. | |
357 | */ | |
a2fd50ef | 358 | static __inline__ size_t ltt_write_event_header(struct ltt_trace_struct *trace, |
b5b073e2 | 359 | struct ust_buffer *buf, long buf_offset, |
9dad1eb8 PMF |
360 | u16 eID, size_t event_size, |
361 | u64 tsc, unsigned int rflags) | |
362 | { | |
363 | struct ltt_event_header header; | |
364 | size_t small_size; | |
365 | ||
366 | switch (rflags) { | |
367 | case LTT_RFLAG_ID_SIZE_TSC: | |
368 | header.id_time = 29 << LTT_TSC_BITS; | |
369 | break; | |
370 | case LTT_RFLAG_ID_SIZE: | |
371 | header.id_time = 30 << LTT_TSC_BITS; | |
372 | break; | |
373 | case LTT_RFLAG_ID: | |
374 | header.id_time = 31 << LTT_TSC_BITS; | |
375 | break; | |
376 | default: | |
377 | header.id_time = eID << LTT_TSC_BITS; | |
378 | break; | |
379 | } | |
380 | header.id_time |= (u32)tsc & LTT_TSC_MASK; | |
b5b073e2 | 381 | ust_buffers_write(buf, buf_offset, &header, sizeof(header)); |
9dad1eb8 PMF |
382 | buf_offset += sizeof(header); |
383 | ||
384 | switch (rflags) { | |
385 | case LTT_RFLAG_ID_SIZE_TSC: | |
386 | small_size = min_t(size_t, event_size, 0xFFFFU); | |
b5b073e2 | 387 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
388 | (u16[]){ (u16)eID }, sizeof(u16)); |
389 | buf_offset += sizeof(u16); | |
b5b073e2 | 390 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
391 | (u16[]){ (u16)small_size }, sizeof(u16)); |
392 | buf_offset += sizeof(u16); | |
393 | if (small_size == 0xFFFFU) { | |
b5b073e2 | 394 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
395 | (u32[]){ (u32)event_size }, sizeof(u32)); |
396 | buf_offset += sizeof(u32); | |
397 | } | |
398 | buf_offset += ltt_align(buf_offset, sizeof(u64)); | |
b5b073e2 | 399 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
400 | (u64[]){ (u64)tsc }, sizeof(u64)); |
401 | buf_offset += sizeof(u64); | |
402 | break; | |
403 | case LTT_RFLAG_ID_SIZE: | |
404 | small_size = min_t(size_t, event_size, 0xFFFFU); | |
b5b073e2 | 405 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
406 | (u16[]){ (u16)eID }, sizeof(u16)); |
407 | buf_offset += sizeof(u16); | |
b5b073e2 | 408 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
409 | (u16[]){ (u16)small_size }, sizeof(u16)); |
410 | buf_offset += sizeof(u16); | |
411 | if (small_size == 0xFFFFU) { | |
b5b073e2 | 412 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
413 | (u32[]){ (u32)event_size }, sizeof(u32)); |
414 | buf_offset += sizeof(u32); | |
415 | } | |
416 | break; | |
417 | case LTT_RFLAG_ID: | |
b5b073e2 | 418 | ust_buffers_write(buf, buf_offset, |
9dad1eb8 PMF |
419 | (u16[]){ (u16)eID }, sizeof(u16)); |
420 | buf_offset += sizeof(u16); | |
421 | break; | |
422 | default: | |
423 | break; | |
424 | } | |
425 | ||
426 | return buf_offset; | |
427 | } | |
428 | ||
429 | /* Lockless LTTng */ | |
430 | ||
9dad1eb8 PMF |
431 | /* |
432 | * ltt_reserve_slot | |
433 | * | |
434 | * Atomic slot reservation in a LTTng buffer. It will take care of | |
435 | * sub-buffer switching. | |
436 | * | |
437 | * Parameters: | |
438 | * | |
439 | * @trace : the trace structure to log to. | |
440 | * @channel : the chanel to reserve space into. | |
441 | * @transport_data : specific transport data. | |
442 | * @data_size : size of the variable length data to log. | |
443 | * @slot_size : pointer to total size of the slot (out) | |
444 | * @buf_offset : pointer to reserve offset (out) | |
445 | * @tsc : pointer to the tsc at the slot reservation (out) | |
446 | * @rflags : reservation flags (header specificity) | |
447 | * @cpu : cpu id | |
448 | * | |
449 | * Return : -ENOSPC if not enough space, else 0. | |
450 | */ | |
a2fd50ef | 451 | static __inline__ int ltt_reserve_slot( |
9dad1eb8 | 452 | struct ltt_trace_struct *trace, |
b5b073e2 | 453 | struct ust_channel *channel, |
9dad1eb8 PMF |
454 | void **transport_data, |
455 | size_t data_size, | |
456 | size_t *slot_size, | |
457 | long *buf_offset, | |
458 | u64 *tsc, | |
459 | unsigned int *rflags, | |
c1dea0b3 | 460 | int largest_align) |
9dad1eb8 PMF |
461 | { |
462 | return trace->ops->reserve_slot(trace, channel, transport_data, | |
463 | data_size, slot_size, buf_offset, tsc, rflags, | |
c1dea0b3 | 464 | largest_align); |
9dad1eb8 PMF |
465 | } |
466 | ||
467 | ||
8431032f PMF |
468 | ///* |
469 | // * ltt_commit_slot | |
470 | // * | |
471 | // * Atomic unordered slot commit. Increments the commit count in the | |
472 | // * specified sub-buffer, and delivers it if necessary. | |
473 | // * | |
474 | // * Parameters: | |
475 | // * | |
476 | // * @channel : the chanel to reserve space into. | |
477 | // * @transport_data : specific transport data. | |
478 | // * @buf_offset : offset of beginning of reserved slot | |
479 | // * @slot_size : size of the reserved slot. | |
480 | // */ | |
481 | //static inline void ltt_commit_slot( | |
482 | // struct ltt_channel_struct *channel, | |
483 | // void **transport_data, | |
484 | // long buf_offset, | |
485 | // size_t slot_size) | |
486 | //{ | |
487 | // struct ltt_trace_struct *trace = channel->trace; | |
488 | // | |
489 | // trace->ops->commit_slot(channel, transport_data, buf_offset, slot_size); | |
490 | //} | |
9dad1eb8 PMF |
491 | |
492 | /* | |
493 | * Control channels : | |
494 | * control/metadata | |
495 | * control/interrupts | |
496 | * control/... | |
497 | * | |
498 | * cpu channel : | |
499 | * cpu | |
500 | */ | |
9dad1eb8 PMF |
501 | |
502 | #define LTT_METADATA_CHANNEL "metadata_state" | |
b6bf28ec | 503 | #define LTT_UST_CHANNEL "ust" |
9dad1eb8 PMF |
504 | |
505 | #define LTT_FLIGHT_PREFIX "flight-" | |
506 | ||
507 | /* Tracer properties */ | |
32072f29 PMF |
508 | //#define LTT_DEFAULT_SUBBUF_SIZE_LOW 134217728 |
509 | #define LTT_DEFAULT_SUBBUF_SIZE_LOW 65536 | |
510 | //#define LTT_DEFAULT_SUBBUF_SIZE_LOW 4096 | |
9dad1eb8 | 511 | #define LTT_DEFAULT_N_SUBBUFS_LOW 2 |
32072f29 PMF |
512 | //#define LTT_DEFAULT_SUBBUF_SIZE_MED 134217728 |
513 | #define LTT_DEFAULT_SUBBUF_SIZE_MED 262144 | |
514 | //#define LTT_DEFAULT_SUBBUF_SIZE_MED 4096 | |
9dad1eb8 | 515 | #define LTT_DEFAULT_N_SUBBUFS_MED 2 |
32072f29 PMF |
516 | //#define LTT_DEFAULT_SUBBUF_SIZE_HIGH 134217728 |
517 | #define LTT_DEFAULT_SUBBUF_SIZE_HIGH 1048576 | |
518 | //#define LTT_DEFAULT_SUBBUF_SIZE_HIGH 4096 | |
9dad1eb8 PMF |
519 | #define LTT_DEFAULT_N_SUBBUFS_HIGH 2 |
520 | #define LTT_TRACER_MAGIC_NUMBER 0x00D6B7ED | |
521 | #define LTT_TRACER_VERSION_MAJOR 2 | |
522 | #define LTT_TRACER_VERSION_MINOR 3 | |
523 | ||
524 | /* | |
525 | * Size reserved for high priority events (interrupts, NMI, BH) at the end of a | |
526 | * nearly full buffer. User space won't use this last amount of space when in | |
527 | * blocking mode. This space also includes the event header that would be | |
528 | * written by this user space event. | |
529 | */ | |
530 | #define LTT_RESERVE_CRITICAL 4096 | |
531 | ||
532 | /* Register and unregister function pointers */ | |
533 | ||
534 | enum ltt_module_function { | |
535 | LTT_FUNCTION_RUN_FILTER, | |
536 | LTT_FUNCTION_FILTER_CONTROL, | |
537 | LTT_FUNCTION_STATEDUMP | |
538 | }; | |
539 | ||
064842c6 PMF |
540 | extern void ltt_transport_register(struct ltt_transport *transport); |
541 | extern void ltt_transport_unregister(struct ltt_transport *transport); | |
9dad1eb8 PMF |
542 | |
543 | /* Exported control function */ | |
544 | ||
9dad1eb8 PMF |
545 | union ltt_control_args { |
546 | struct { | |
547 | enum trace_mode mode; | |
548 | unsigned int subbuf_size_low; | |
549 | unsigned int n_subbufs_low; | |
550 | unsigned int subbuf_size_med; | |
551 | unsigned int n_subbufs_med; | |
552 | unsigned int subbuf_size_high; | |
553 | unsigned int n_subbufs_high; | |
554 | } new_trace; | |
555 | }; | |
556 | ||
064842c6 PMF |
557 | extern int _ltt_trace_setup(const char *trace_name); |
558 | extern int ltt_trace_setup(const char *trace_name); | |
559 | extern struct ltt_trace_struct *_ltt_trace_find_setup(const char *trace_name); | |
560 | extern int ltt_trace_set_type(const char *trace_name, const char *trace_type); | |
561 | extern int ltt_trace_set_channel_subbufsize(const char *trace_name, | |
9dad1eb8 | 562 | const char *channel_name, unsigned int size); |
064842c6 | 563 | extern int ltt_trace_set_channel_subbufcount(const char *trace_name, |
9dad1eb8 | 564 | const char *channel_name, unsigned int cnt); |
064842c6 | 565 | extern int ltt_trace_set_channel_enable(const char *trace_name, |
9dad1eb8 | 566 | const char *channel_name, unsigned int enable); |
064842c6 | 567 | extern int ltt_trace_set_channel_overwrite(const char *trace_name, |
9dad1eb8 | 568 | const char *channel_name, unsigned int overwrite); |
064842c6 PMF |
569 | extern int ltt_trace_alloc(const char *trace_name); |
570 | extern int ltt_trace_destroy(const char *trace_name); | |
571 | extern int ltt_trace_start(const char *trace_name); | |
572 | extern int ltt_trace_stop(const char *trace_name); | |
9dad1eb8 | 573 | |
9dad1eb8 PMF |
574 | enum ltt_filter_control_msg { |
575 | LTT_FILTER_DEFAULT_ACCEPT, | |
576 | LTT_FILTER_DEFAULT_REJECT | |
577 | }; | |
578 | ||
579 | extern int ltt_filter_control(enum ltt_filter_control_msg msg, | |
580 | const char *trace_name); | |
581 | ||
582 | extern struct dentry *get_filter_root(void); | |
583 | ||
064842c6 | 584 | extern void ltt_write_trace_header(struct ltt_trace_struct *trace, |
9dad1eb8 | 585 | struct ltt_subbuffer_header *header); |
b5b073e2 | 586 | extern void ltt_buffer_destroy(struct ust_channel *ltt_chan); |
9dad1eb8 | 587 | |
064842c6 | 588 | extern void ltt_core_register(int (*function)(u8, void *)); |
9dad1eb8 | 589 | |
064842c6 | 590 | extern void ltt_core_unregister(void); |
9dad1eb8 | 591 | |
064842c6 PMF |
592 | extern void ltt_release_trace(struct kref *kref); |
593 | extern void ltt_release_transport(struct kref *kref); | |
9dad1eb8 | 594 | |
9dad1eb8 PMF |
595 | extern void ltt_dump_marker_state(struct ltt_trace_struct *trace); |
596 | ||
064842c6 PMF |
597 | extern void ltt_lock_traces(void); |
598 | extern void ltt_unlock_traces(void); | |
9dad1eb8 | 599 | |
064842c6 | 600 | extern struct ltt_trace_struct *_ltt_trace_find(const char *trace_name); |
d0b5f2b9 | 601 | |
9dad1eb8 | 602 | #endif /* _LTT_TRACER_H */ |