Commit | Line | Data |
---|---|---|
3d1fc7fd | 1 | /* |
7dd08bec | 2 | * lttng-ring-buffer-client.h |
3d1fc7fd | 3 | * |
3d1fc7fd MD |
4 | * LTTng lib ring buffer client template. |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
3d1fc7fd MD |
21 | */ |
22 | ||
9f3fdbc6 | 23 | #include <stdint.h> |
4318ae1b MD |
24 | #include <lttng/ust-events.h> |
25 | #include "lttng/bitfield.h" | |
b728d87e | 26 | #include "clock.h" |
7dd08bec | 27 | #include "lttng-tracer.h" |
9f3fdbc6 | 28 | #include "../libringbuffer/frontend_types.h" |
3d1fc7fd | 29 | |
79dfbf42 MD |
30 | #define LTTNG_COMPACT_EVENT_BITS 5 |
31 | #define LTTNG_COMPACT_TSC_BITS 27 | |
32 | ||
3d1fc7fd MD |
33 | /* |
34 | * Keep the natural field alignment for _each field_ within this structure if | |
35 | * you ever add/remove a field from this header. Packed attribute is not used | |
36 | * because gcc generates poor code on at least powerpc and mips. Don't ever | |
37 | * let gcc add padding between the structure elements. | |
38 | */ | |
39 | ||
40 | struct packet_header { | |
41 | /* Trace packet header */ | |
42 | uint32_t magic; /* | |
43 | * Trace magic number. | |
44 | * contains endianness information. | |
45 | */ | |
19d8b1b3 | 46 | uint8_t uuid[LTTNG_UST_UUID_LEN]; |
3d1fc7fd MD |
47 | uint32_t stream_id; |
48 | ||
49 | struct { | |
50 | /* Stream packet context */ | |
51 | uint64_t timestamp_begin; /* Cycle count at subbuffer start */ | |
52 | uint64_t timestamp_end; /* Cycle count at subbuffer end */ | |
0c00a107 MD |
53 | uint64_t content_size; /* Size of data in subbuffer */ |
54 | uint64_t packet_size; /* Subbuffer size (include padding) */ | |
18fc8d71 | 55 | unsigned long events_discarded; /* |
3d1fc7fd MD |
56 | * Events lost in this subbuffer since |
57 | * the beginning of the trace. | |
58 | * (may overflow) | |
59 | */ | |
3d1fc7fd MD |
60 | uint32_t cpu_id; /* CPU id associated with stream */ |
61 | uint8_t header_end; /* End of header */ | |
62 | } ctx; | |
63 | }; | |
64 | ||
65 | ||
23c8854a | 66 | static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan) |
3d1fc7fd MD |
67 | { |
68 | return trace_clock_read64(); | |
69 | } | |
70 | ||
71 | static inline | |
72 | size_t ctx_get_size(size_t offset, struct lttng_ctx *ctx) | |
73 | { | |
74 | int i; | |
75 | size_t orig_offset = offset; | |
76 | ||
b5a3dfa5 | 77 | if (caa_likely(!ctx)) |
3d1fc7fd | 78 | return 0; |
b2cc986a | 79 | offset += lib_ring_buffer_align(offset, ctx->largest_align); |
3d1fc7fd MD |
80 | for (i = 0; i < ctx->nr_fields; i++) |
81 | offset += ctx->fields[i].get_size(offset); | |
82 | return offset - orig_offset; | |
83 | } | |
84 | ||
85 | static inline | |
4cfec15c | 86 | void ctx_record(struct lttng_ust_lib_ring_buffer_ctx *bufctx, |
7dd08bec | 87 | struct lttng_channel *chan, |
3d1fc7fd MD |
88 | struct lttng_ctx *ctx) |
89 | { | |
90 | int i; | |
91 | ||
b5a3dfa5 | 92 | if (caa_likely(!ctx)) |
3d1fc7fd | 93 | return; |
b2cc986a | 94 | lib_ring_buffer_align_ctx(bufctx, ctx->largest_align); |
3d1fc7fd MD |
95 | for (i = 0; i < ctx->nr_fields; i++) |
96 | ctx->fields[i].record(&ctx->fields[i], bufctx, chan); | |
97 | } | |
98 | ||
99 | /* | |
100 | * record_header_size - Calculate the header size and padding necessary. | |
101 | * @config: ring buffer instance configuration | |
102 | * @chan: channel | |
103 | * @offset: offset in the write buffer | |
104 | * @pre_header_padding: padding to add before the header (output) | |
105 | * @ctx: reservation context | |
106 | * | |
107 | * Returns the event header size (including padding). | |
108 | * | |
109 | * The payload must itself determine its own alignment from the biggest type it | |
110 | * contains. | |
111 | */ | |
112 | static __inline__ | |
4cfec15c | 113 | unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, |
3d1fc7fd MD |
114 | struct channel *chan, size_t offset, |
115 | size_t *pre_header_padding, | |
4cfec15c | 116 | struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd | 117 | { |
7dd08bec MD |
118 | struct lttng_channel *lttng_chan = channel_get_private(chan); |
119 | struct lttng_event *event = ctx->priv; | |
3d1fc7fd MD |
120 | size_t orig_offset = offset; |
121 | size_t padding; | |
122 | ||
7dd08bec | 123 | switch (lttng_chan->header_type) { |
3d1fc7fd | 124 | case 1: /* compact */ |
1dbfff0c | 125 | padding = lib_ring_buffer_align(offset, lttng_alignof(uint32_t)); |
3d1fc7fd | 126 | offset += padding; |
7dd08bec | 127 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
128 | offset += sizeof(uint32_t); /* id and timestamp */ |
129 | } else { | |
79dfbf42 MD |
130 | /* Minimum space taken by LTTNG_COMPACT_EVENT_BITS id */ |
131 | offset += (LTTNG_COMPACT_EVENT_BITS + CHAR_BIT - 1) / CHAR_BIT; | |
3d1fc7fd | 132 | /* Align extended struct on largest member */ |
1dbfff0c | 133 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd | 134 | offset += sizeof(uint32_t); /* id */ |
1dbfff0c | 135 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
136 | offset += sizeof(uint64_t); /* timestamp */ |
137 | } | |
138 | break; | |
139 | case 2: /* large */ | |
1dbfff0c | 140 | padding = lib_ring_buffer_align(offset, lttng_alignof(uint16_t)); |
3d1fc7fd MD |
141 | offset += padding; |
142 | offset += sizeof(uint16_t); | |
7dd08bec | 143 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
1dbfff0c | 144 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint32_t)); |
3d1fc7fd MD |
145 | offset += sizeof(uint32_t); /* timestamp */ |
146 | } else { | |
147 | /* Align extended struct on largest member */ | |
1dbfff0c | 148 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd | 149 | offset += sizeof(uint32_t); /* id */ |
1dbfff0c | 150 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
151 | offset += sizeof(uint64_t); /* timestamp */ |
152 | } | |
153 | break; | |
154 | default: | |
9f3fdbc6 | 155 | padding = 0; |
3d1fc7fd MD |
156 | WARN_ON_ONCE(1); |
157 | } | |
158 | offset += ctx_get_size(offset, event->ctx); | |
7dd08bec | 159 | offset += ctx_get_size(offset, lttng_chan->ctx); |
3d1fc7fd MD |
160 | |
161 | *pre_header_padding = padding; | |
162 | return offset - orig_offset; | |
163 | } | |
164 | ||
9f3fdbc6 | 165 | #include "../libringbuffer/api.h" |
82b9bde8 | 166 | #include "lttng-rb-clients.h" |
3d1fc7fd | 167 | |
9f3fdbc6 | 168 | static |
7dd08bec | 169 | void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 170 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
171 | uint32_t event_id); |
172 | ||
173 | /* | |
7dd08bec | 174 | * lttng_write_event_header |
3d1fc7fd MD |
175 | * |
176 | * Writes the event header to the offset (already aligned on 32-bits). | |
177 | * | |
178 | * @config: ring buffer instance configuration | |
179 | * @ctx: reservation context | |
180 | * @event_id: event ID | |
181 | */ | |
182 | static __inline__ | |
7dd08bec | 183 | void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 184 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
185 | uint32_t event_id) |
186 | { | |
7dd08bec MD |
187 | struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); |
188 | struct lttng_event *event = ctx->priv; | |
3d1fc7fd | 189 | |
b5a3dfa5 | 190 | if (caa_unlikely(ctx->rflags)) |
3d1fc7fd MD |
191 | goto slow_path; |
192 | ||
7dd08bec | 193 | switch (lttng_chan->header_type) { |
3d1fc7fd MD |
194 | case 1: /* compact */ |
195 | { | |
196 | uint32_t id_time = 0; | |
197 | ||
79dfbf42 MD |
198 | bt_bitfield_write(&id_time, uint32_t, |
199 | 0, | |
200 | LTTNG_COMPACT_EVENT_BITS, | |
201 | event_id); | |
202 | bt_bitfield_write(&id_time, uint32_t, | |
203 | LTTNG_COMPACT_EVENT_BITS, | |
204 | LTTNG_COMPACT_TSC_BITS, | |
205 | ctx->tsc); | |
3d1fc7fd MD |
206 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); |
207 | break; | |
208 | } | |
209 | case 2: /* large */ | |
210 | { | |
211 | uint32_t timestamp = (uint32_t) ctx->tsc; | |
212 | uint16_t id = event_id; | |
213 | ||
214 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
1dbfff0c | 215 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint32_t)); |
3d1fc7fd MD |
216 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
217 | break; | |
218 | } | |
219 | default: | |
220 | WARN_ON_ONCE(1); | |
221 | } | |
222 | ||
7dd08bec MD |
223 | ctx_record(ctx, lttng_chan, lttng_chan->ctx); |
224 | ctx_record(ctx, lttng_chan, event->ctx); | |
d3b2c3e0 | 225 | lib_ring_buffer_align_ctx(ctx, ctx->largest_align); |
3d1fc7fd MD |
226 | |
227 | return; | |
228 | ||
229 | slow_path: | |
7dd08bec | 230 | lttng_write_event_header_slow(config, ctx, event_id); |
3d1fc7fd MD |
231 | } |
232 | ||
9f3fdbc6 | 233 | static |
7dd08bec | 234 | void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 235 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
236 | uint32_t event_id) |
237 | { | |
7dd08bec MD |
238 | struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); |
239 | struct lttng_event *event = ctx->priv; | |
3d1fc7fd | 240 | |
7dd08bec | 241 | switch (lttng_chan->header_type) { |
3d1fc7fd | 242 | case 1: /* compact */ |
7dd08bec | 243 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
244 | uint32_t id_time = 0; |
245 | ||
79dfbf42 MD |
246 | bt_bitfield_write(&id_time, uint32_t, |
247 | 0, | |
248 | LTTNG_COMPACT_EVENT_BITS, | |
249 | event_id); | |
250 | bt_bitfield_write(&id_time, uint32_t, | |
251 | LTTNG_COMPACT_EVENT_BITS, | |
252 | LTTNG_COMPACT_TSC_BITS, | |
253 | ctx->tsc); | |
3d1fc7fd MD |
254 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); |
255 | } else { | |
256 | uint8_t id = 0; | |
257 | uint64_t timestamp = ctx->tsc; | |
258 | ||
79dfbf42 MD |
259 | bt_bitfield_write(&id, uint8_t, |
260 | 0, | |
261 | LTTNG_COMPACT_EVENT_BITS, | |
262 | 31); | |
3d1fc7fd MD |
263 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
264 | /* Align extended struct on largest member */ | |
1dbfff0c | 265 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd | 266 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
1dbfff0c | 267 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
268 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
269 | } | |
270 | break; | |
271 | case 2: /* large */ | |
272 | { | |
7dd08bec | 273 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
274 | uint32_t timestamp = (uint32_t) ctx->tsc; |
275 | uint16_t id = event_id; | |
276 | ||
277 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
1dbfff0c | 278 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint32_t)); |
3d1fc7fd MD |
279 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
280 | } else { | |
281 | uint16_t id = 65535; | |
282 | uint64_t timestamp = ctx->tsc; | |
283 | ||
284 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
285 | /* Align extended struct on largest member */ | |
1dbfff0c | 286 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd | 287 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
1dbfff0c | 288 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
289 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
290 | } | |
291 | break; | |
292 | } | |
293 | default: | |
294 | WARN_ON_ONCE(1); | |
295 | } | |
7dd08bec MD |
296 | ctx_record(ctx, lttng_chan, lttng_chan->ctx); |
297 | ctx_record(ctx, lttng_chan, event->ctx); | |
d3b2c3e0 | 298 | lib_ring_buffer_align_ctx(ctx, ctx->largest_align); |
3d1fc7fd MD |
299 | } |
300 | ||
4cfec15c | 301 | static const struct lttng_ust_lib_ring_buffer_config client_config; |
3d1fc7fd | 302 | |
23c8854a | 303 | static uint64_t client_ring_buffer_clock_read(struct channel *chan) |
3d1fc7fd MD |
304 | { |
305 | return lib_ring_buffer_clock_read(chan); | |
306 | } | |
307 | ||
308 | static | |
4cfec15c | 309 | size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, |
3d1fc7fd MD |
310 | struct channel *chan, size_t offset, |
311 | size_t *pre_header_padding, | |
4cfec15c | 312 | struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
313 | { |
314 | return record_header_size(config, chan, offset, | |
315 | pre_header_padding, ctx); | |
316 | } | |
317 | ||
318 | /** | |
319 | * client_packet_header_size - called on buffer-switch to a new sub-buffer | |
320 | * | |
321 | * Return header size without padding after the structure. Don't use packed | |
322 | * structure because gcc generates inefficient code on some architectures | |
323 | * (powerpc, mips..) | |
324 | */ | |
325 | static size_t client_packet_header_size(void) | |
326 | { | |
327 | return offsetof(struct packet_header, ctx.header_end); | |
328 | } | |
329 | ||
23c8854a | 330 | static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc, |
1d498196 | 331 | unsigned int subbuf_idx, |
38fae1d3 | 332 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 333 | { |
1d498196 | 334 | struct channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
335 | struct packet_header *header = |
336 | (struct packet_header *) | |
337 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
338 | subbuf_idx * chan->backend.subbuf_size, |
339 | handle); | |
7dd08bec | 340 | struct lttng_channel *lttng_chan = channel_get_private(chan); |
3d1fc7fd MD |
341 | |
342 | header->magic = CTF_MAGIC_NUMBER; | |
7dd08bec MD |
343 | memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid)); |
344 | header->stream_id = lttng_chan->id; | |
3d1fc7fd MD |
345 | header->ctx.timestamp_begin = tsc; |
346 | header->ctx.timestamp_end = 0; | |
0c00a107 MD |
347 | header->ctx.content_size = ~0ULL; /* for debugging */ |
348 | header->ctx.packet_size = ~0ULL; | |
3d1fc7fd | 349 | header->ctx.events_discarded = 0; |
3d1fc7fd MD |
350 | header->ctx.cpu_id = buf->backend.cpu; |
351 | } | |
352 | ||
353 | /* | |
354 | * offset is assumed to never be 0 here : never deliver a completely empty | |
355 | * subbuffer. data_size is between 1 and subbuf_size. | |
356 | */ | |
23c8854a | 357 | static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc, |
1d498196 | 358 | unsigned int subbuf_idx, unsigned long data_size, |
38fae1d3 | 359 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 360 | { |
1d498196 | 361 | struct channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
362 | struct packet_header *header = |
363 | (struct packet_header *) | |
364 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
365 | subbuf_idx * chan->backend.subbuf_size, |
366 | handle); | |
3d1fc7fd MD |
367 | unsigned long records_lost = 0; |
368 | ||
369 | header->ctx.timestamp_end = tsc; | |
b1830883 MD |
370 | header->ctx.content_size = |
371 | (uint64_t) data_size * CHAR_BIT; /* in bits */ | |
372 | header->ctx.packet_size = | |
373 | (uint64_t) PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
04489ab4 MD |
374 | |
375 | records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf); | |
3d1fc7fd MD |
376 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); |
377 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
378 | header->ctx.events_discarded = records_lost; | |
379 | } | |
380 | ||
4cfec15c | 381 | static int client_buffer_create(struct lttng_ust_lib_ring_buffer *buf, void *priv, |
38fae1d3 | 382 | int cpu, const char *name, struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
383 | { |
384 | return 0; | |
385 | } | |
386 | ||
4cfec15c | 387 | static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf, void *priv, int cpu, struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
388 | { |
389 | } | |
390 | ||
a9ff648c MD |
391 | static void client_content_size_field(const struct lttng_ust_lib_ring_buffer_config *config, |
392 | size_t *offset, size_t *length) | |
393 | { | |
394 | *offset = offsetof(struct packet_header, ctx.content_size); | |
395 | *length = sizeof(((struct packet_header *) NULL)->ctx.content_size); | |
396 | } | |
397 | ||
398 | static void client_packet_size_field(const struct lttng_ust_lib_ring_buffer_config *config, | |
399 | size_t *offset, size_t *length) | |
400 | { | |
401 | *offset = offsetof(struct packet_header, ctx.packet_size); | |
402 | *length = sizeof(((struct packet_header *) NULL)->ctx.packet_size); | |
403 | } | |
404 | ||
b2f3252a JD |
405 | static struct packet_header *client_packet_header(struct lttng_ust_lib_ring_buffer *buf, |
406 | struct lttng_ust_shm_handle *handle) | |
407 | { | |
c4d6bd10 | 408 | return lib_ring_buffer_read_offset_address(&buf->backend, 0, handle); |
b2f3252a JD |
409 | } |
410 | ||
411 | static int client_timestamp_begin(struct lttng_ust_lib_ring_buffer *buf, | |
412 | struct lttng_ust_shm_handle *handle, | |
413 | uint64_t *timestamp_begin) | |
414 | { | |
415 | struct packet_header *header; | |
416 | ||
417 | header = client_packet_header(buf, handle); | |
418 | *timestamp_begin = header->ctx.timestamp_begin; | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int client_timestamp_end(struct lttng_ust_lib_ring_buffer *buf, | |
423 | struct lttng_ust_shm_handle *handle, | |
424 | uint64_t *timestamp_end) | |
425 | { | |
426 | struct packet_header *header; | |
427 | ||
428 | header = client_packet_header(buf, handle); | |
429 | *timestamp_end = header->ctx.timestamp_end; | |
430 | return 0; | |
431 | } | |
432 | ||
433 | static int client_events_discarded(struct lttng_ust_lib_ring_buffer *buf, | |
434 | struct lttng_ust_shm_handle *handle, | |
435 | uint64_t *events_discarded) | |
436 | { | |
437 | struct packet_header *header; | |
438 | ||
439 | header = client_packet_header(buf, handle); | |
440 | *events_discarded = header->ctx.events_discarded; | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static int client_content_size(struct lttng_ust_lib_ring_buffer *buf, | |
445 | struct lttng_ust_shm_handle *handle, | |
446 | uint64_t *content_size) | |
447 | { | |
448 | struct packet_header *header; | |
449 | ||
450 | header = client_packet_header(buf, handle); | |
451 | *content_size = header->ctx.content_size; | |
452 | return 0; | |
453 | } | |
454 | ||
455 | static int client_packet_size(struct lttng_ust_lib_ring_buffer *buf, | |
456 | struct lttng_ust_shm_handle *handle, | |
457 | uint64_t *packet_size) | |
458 | { | |
459 | struct packet_header *header; | |
460 | ||
461 | header = client_packet_header(buf, handle); | |
462 | *packet_size = header->ctx.packet_size; | |
463 | return 0; | |
464 | } | |
465 | ||
466 | static int client_stream_id(struct lttng_ust_lib_ring_buffer *buf, | |
467 | struct lttng_ust_shm_handle *handle, | |
468 | uint64_t *stream_id) | |
469 | { | |
470 | struct packet_header *header; | |
471 | ||
472 | header = client_packet_header(buf, handle); | |
473 | *stream_id = header->stream_id; | |
474 | return 0; | |
475 | } | |
476 | ||
fca361e8 JD |
477 | static int client_current_timestamp(struct lttng_ust_lib_ring_buffer *buf, |
478 | struct lttng_ust_shm_handle *handle, | |
479 | uint64_t *ts) | |
480 | { | |
481 | struct channel *chan; | |
482 | ||
483 | chan = shmp(handle, handle->chan); | |
484 | *ts = client_ring_buffer_clock_read(chan); | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
82b9bde8 JD |
489 | static const |
490 | struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = { | |
491 | .parent = { | |
492 | .ring_buffer_clock_read = client_ring_buffer_clock_read, | |
493 | .record_header_size = client_record_header_size, | |
494 | .subbuffer_header_size = client_packet_header_size, | |
495 | .buffer_begin = client_buffer_begin, | |
496 | .buffer_end = client_buffer_end, | |
497 | .buffer_create = client_buffer_create, | |
498 | .buffer_finalize = client_buffer_finalize, | |
a9ff648c MD |
499 | .content_size_field = client_content_size_field, |
500 | .packet_size_field = client_packet_size_field, | |
82b9bde8 | 501 | }, |
b2f3252a JD |
502 | .timestamp_begin = client_timestamp_begin, |
503 | .timestamp_end = client_timestamp_end, | |
504 | .events_discarded = client_events_discarded, | |
505 | .content_size = client_content_size, | |
506 | .packet_size = client_packet_size, | |
507 | .stream_id = client_stream_id, | |
fca361e8 | 508 | .current_timestamp = client_current_timestamp, |
82b9bde8 JD |
509 | }; |
510 | ||
4cfec15c | 511 | static const struct lttng_ust_lib_ring_buffer_config client_config = { |
3d1fc7fd MD |
512 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, |
513 | .cb.record_header_size = client_record_header_size, | |
514 | .cb.subbuffer_header_size = client_packet_header_size, | |
515 | .cb.buffer_begin = client_buffer_begin, | |
516 | .cb.buffer_end = client_buffer_end, | |
517 | .cb.buffer_create = client_buffer_create, | |
518 | .cb.buffer_finalize = client_buffer_finalize, | |
a9ff648c MD |
519 | .cb.content_size_field = client_content_size_field, |
520 | .cb.packet_size_field = client_packet_size_field, | |
3d1fc7fd | 521 | |
79dfbf42 | 522 | .tsc_bits = LTTNG_COMPACT_TSC_BITS, |
3d1fc7fd | 523 | .alloc = RING_BUFFER_ALLOC_PER_CPU, |
5d61a504 | 524 | .sync = RING_BUFFER_SYNC_GLOBAL, |
3d1fc7fd MD |
525 | .mode = RING_BUFFER_MODE_TEMPLATE, |
526 | .backend = RING_BUFFER_PAGE, | |
5d61a504 | 527 | .output = RING_BUFFER_MMAP, |
3d1fc7fd | 528 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
5d61a504 | 529 | .ipi = RING_BUFFER_NO_IPI_BARRIER, |
34a91bdb | 530 | .wakeup = LTTNG_CLIENT_WAKEUP, |
c1fca457 | 531 | .client_type = LTTNG_CLIENT_TYPE, |
82b9bde8 JD |
532 | |
533 | .cb_ptr = &client_cb.parent, | |
3d1fc7fd MD |
534 | }; |
535 | ||
82b9bde8 | 536 | const struct lttng_ust_client_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_cb; |
c1fca457 | 537 | |
3d1fc7fd | 538 | static |
7dd08bec | 539 | struct lttng_channel *_channel_create(const char *name, |
a3f61e7f | 540 | void *buf_addr, |
3d1fc7fd MD |
541 | size_t subbuf_size, size_t num_subbuf, |
542 | unsigned int switch_timer_interval, | |
193183fb | 543 | unsigned int read_timer_interval, |
6ca18e66 | 544 | unsigned char *uuid, |
a9ff648c | 545 | uint32_t chan_id, |
5ea386c3 | 546 | const int *stream_fds, int nr_stream_fds) |
3d1fc7fd | 547 | { |
74d81a6c | 548 | struct lttng_channel chan_priv_init; |
a3f61e7f | 549 | struct lttng_ust_shm_handle *handle; |
74d81a6c MD |
550 | struct lttng_channel *lttng_chan; |
551 | void *priv; | |
a3f61e7f | 552 | |
74d81a6c MD |
553 | memset(&chan_priv_init, 0, sizeof(chan_priv_init)); |
554 | memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN); | |
6ca18e66 | 555 | chan_priv_init.id = chan_id; |
a3f61e7f | 556 | handle = channel_create(&client_config, name, |
8824f307 MD |
557 | &priv, __alignof__(struct lttng_channel), |
558 | sizeof(struct lttng_channel), | |
74d81a6c | 559 | &chan_priv_init, |
a3f61e7f | 560 | buf_addr, subbuf_size, num_subbuf, |
a9ff648c | 561 | switch_timer_interval, read_timer_interval, |
5ea386c3 | 562 | stream_fds, nr_stream_fds); |
a3f61e7f | 563 | if (!handle) |
afdf9825 | 564 | return NULL; |
7dd08bec MD |
565 | lttng_chan = priv; |
566 | lttng_chan->handle = handle; | |
74d81a6c | 567 | lttng_chan->chan = shmp(handle, handle->chan); |
7dd08bec | 568 | return lttng_chan; |
3d1fc7fd MD |
569 | } |
570 | ||
571 | static | |
74d81a6c | 572 | void lttng_channel_destroy(struct lttng_channel *chan) |
3d1fc7fd | 573 | { |
74d81a6c | 574 | channel_destroy(chan->chan, chan->handle, 1); |
3d1fc7fd MD |
575 | } |
576 | ||
577 | static | |
7dd08bec | 578 | int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
579 | uint32_t event_id) |
580 | { | |
7dd08bec | 581 | struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); |
3d1fc7fd MD |
582 | int ret, cpu; |
583 | ||
584 | cpu = lib_ring_buffer_get_cpu(&client_config); | |
585 | if (cpu < 0) | |
586 | return -EPERM; | |
587 | ctx->cpu = cpu; | |
588 | ||
7dd08bec | 589 | switch (lttng_chan->header_type) { |
3d1fc7fd MD |
590 | case 1: /* compact */ |
591 | if (event_id > 30) | |
7dd08bec | 592 | ctx->rflags |= LTTNG_RFLAG_EXTENDED; |
3d1fc7fd MD |
593 | break; |
594 | case 2: /* large */ | |
595 | if (event_id > 65534) | |
7dd08bec | 596 | ctx->rflags |= LTTNG_RFLAG_EXTENDED; |
3d1fc7fd MD |
597 | break; |
598 | default: | |
599 | WARN_ON_ONCE(1); | |
600 | } | |
601 | ||
602 | ret = lib_ring_buffer_reserve(&client_config, ctx); | |
603 | if (ret) | |
604 | goto put; | |
7dd08bec | 605 | lttng_write_event_header(&client_config, ctx, event_id); |
3d1fc7fd MD |
606 | return 0; |
607 | put: | |
608 | lib_ring_buffer_put_cpu(&client_config); | |
609 | return ret; | |
610 | } | |
611 | ||
612 | static | |
7dd08bec | 613 | void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
614 | { |
615 | lib_ring_buffer_commit(&client_config, ctx); | |
616 | lib_ring_buffer_put_cpu(&client_config); | |
617 | } | |
618 | ||
619 | static | |
7dd08bec | 620 | void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src, |
3d1fc7fd MD |
621 | size_t len) |
622 | { | |
623 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
624 | } | |
625 | ||
a44c74d9 MD |
626 | static |
627 | void lttng_event_strcpy(struct lttng_ust_lib_ring_buffer_ctx *ctx, const char *src, | |
628 | size_t len) | |
629 | { | |
630 | lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#'); | |
631 | } | |
632 | ||
9f3fdbc6 | 633 | #if 0 |
3d1fc7fd | 634 | static |
7dd08bec | 635 | wait_queue_head_t *lttng_get_reader_wait_queue(struct channel *chan) |
3d1fc7fd MD |
636 | { |
637 | return &chan->read_wait; | |
638 | } | |
639 | ||
640 | static | |
7dd08bec | 641 | wait_queue_head_t *lttng_get_hp_wait_queue(struct channel *chan) |
3d1fc7fd MD |
642 | { |
643 | return &chan->hp_wait; | |
644 | } | |
9f3fdbc6 | 645 | #endif //0 |
3d1fc7fd MD |
646 | |
647 | static | |
7dd08bec | 648 | int lttng_is_finalized(struct channel *chan) |
3d1fc7fd MD |
649 | { |
650 | return lib_ring_buffer_channel_is_finalized(chan); | |
651 | } | |
652 | ||
653 | static | |
7dd08bec | 654 | int lttng_is_disabled(struct channel *chan) |
3d1fc7fd MD |
655 | { |
656 | return lib_ring_buffer_channel_is_disabled(chan); | |
657 | } | |
658 | ||
43861eab | 659 | static |
7dd08bec | 660 | int lttng_flush_buffer(struct channel *chan, struct lttng_ust_shm_handle *handle) |
43861eab | 661 | { |
4cfec15c | 662 | struct lttng_ust_lib_ring_buffer *buf; |
43861eab MD |
663 | int cpu; |
664 | ||
665 | for_each_channel_cpu(cpu, chan) { | |
74d81a6c MD |
666 | int shm_fd, wait_fd, wakeup_fd; |
667 | uint64_t memory_map_size; | |
43861eab MD |
668 | |
669 | buf = channel_get_ring_buffer(&client_config, chan, | |
670 | cpu, handle, &shm_fd, &wait_fd, | |
74d81a6c | 671 | &wakeup_fd, &memory_map_size); |
43861eab MD |
672 | lib_ring_buffer_switch(&client_config, buf, |
673 | SWITCH_ACTIVE, handle); | |
674 | } | |
675 | return 0; | |
676 | } | |
677 | ||
7dd08bec | 678 | static struct lttng_transport lttng_relay_transport = { |
818173b9 | 679 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap", |
3d1fc7fd MD |
680 | .ops = { |
681 | .channel_create = _channel_create, | |
7dd08bec | 682 | .channel_destroy = lttng_channel_destroy, |
a44c74d9 | 683 | .u.has_strcpy = 1, |
7dd08bec MD |
684 | .event_reserve = lttng_event_reserve, |
685 | .event_commit = lttng_event_commit, | |
686 | .event_write = lttng_event_write, | |
3d1fc7fd | 687 | .packet_avail_size = NULL, /* Would be racy anyway */ |
7dd08bec MD |
688 | //.get_reader_wait_queue = lttng_get_reader_wait_queue, |
689 | //.get_hp_wait_queue = lttng_get_hp_wait_queue, | |
690 | .is_finalized = lttng_is_finalized, | |
691 | .is_disabled = lttng_is_disabled, | |
692 | .flush_buffer = lttng_flush_buffer, | |
a44c74d9 | 693 | .event_strcpy = lttng_event_strcpy, |
3d1fc7fd | 694 | }, |
74d81a6c | 695 | .client_config = &client_config, |
3d1fc7fd MD |
696 | }; |
697 | ||
edaa1431 | 698 | void RING_BUFFER_MODE_TEMPLATE_INIT(void) |
3d1fc7fd | 699 | { |
34a91bdb MD |
700 | DBG("LTT : ltt ring buffer client \"%s\" init\n", |
701 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 702 | lttng_transport_register(<tng_relay_transport); |
3d1fc7fd MD |
703 | } |
704 | ||
edaa1431 | 705 | void RING_BUFFER_MODE_TEMPLATE_EXIT(void) |
3d1fc7fd | 706 | { |
34a91bdb MD |
707 | DBG("LTT : ltt ring buffer client \"%s\" exit\n", |
708 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 709 | lttng_transport_unregister(<tng_relay_transport); |
3d1fc7fd | 710 | } |