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 MD |
78 | return 0; |
79 | for (i = 0; i < ctx->nr_fields; i++) | |
80 | offset += ctx->fields[i].get_size(offset); | |
81 | return offset - orig_offset; | |
82 | } | |
83 | ||
84 | static inline | |
4cfec15c | 85 | void ctx_record(struct lttng_ust_lib_ring_buffer_ctx *bufctx, |
7dd08bec | 86 | struct lttng_channel *chan, |
3d1fc7fd MD |
87 | struct lttng_ctx *ctx) |
88 | { | |
89 | int i; | |
90 | ||
b5a3dfa5 | 91 | if (caa_likely(!ctx)) |
3d1fc7fd MD |
92 | return; |
93 | for (i = 0; i < ctx->nr_fields; i++) | |
94 | ctx->fields[i].record(&ctx->fields[i], bufctx, chan); | |
95 | } | |
96 | ||
97 | /* | |
98 | * record_header_size - Calculate the header size and padding necessary. | |
99 | * @config: ring buffer instance configuration | |
100 | * @chan: channel | |
101 | * @offset: offset in the write buffer | |
102 | * @pre_header_padding: padding to add before the header (output) | |
103 | * @ctx: reservation context | |
104 | * | |
105 | * Returns the event header size (including padding). | |
106 | * | |
107 | * The payload must itself determine its own alignment from the biggest type it | |
108 | * contains. | |
109 | */ | |
110 | static __inline__ | |
4cfec15c | 111 | unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, |
3d1fc7fd MD |
112 | struct channel *chan, size_t offset, |
113 | size_t *pre_header_padding, | |
4cfec15c | 114 | struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd | 115 | { |
7dd08bec MD |
116 | struct lttng_channel *lttng_chan = channel_get_private(chan); |
117 | struct lttng_event *event = ctx->priv; | |
3d1fc7fd MD |
118 | size_t orig_offset = offset; |
119 | size_t padding; | |
120 | ||
7dd08bec | 121 | switch (lttng_chan->header_type) { |
3d1fc7fd | 122 | case 1: /* compact */ |
1dbfff0c | 123 | padding = lib_ring_buffer_align(offset, lttng_alignof(uint32_t)); |
3d1fc7fd | 124 | offset += padding; |
7dd08bec | 125 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
126 | offset += sizeof(uint32_t); /* id and timestamp */ |
127 | } else { | |
79dfbf42 MD |
128 | /* Minimum space taken by LTTNG_COMPACT_EVENT_BITS id */ |
129 | offset += (LTTNG_COMPACT_EVENT_BITS + CHAR_BIT - 1) / CHAR_BIT; | |
3d1fc7fd | 130 | /* Align extended struct on largest member */ |
1dbfff0c | 131 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd | 132 | offset += sizeof(uint32_t); /* id */ |
1dbfff0c | 133 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
134 | offset += sizeof(uint64_t); /* timestamp */ |
135 | } | |
136 | break; | |
137 | case 2: /* large */ | |
1dbfff0c | 138 | padding = lib_ring_buffer_align(offset, lttng_alignof(uint16_t)); |
3d1fc7fd MD |
139 | offset += padding; |
140 | offset += sizeof(uint16_t); | |
7dd08bec | 141 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
1dbfff0c | 142 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint32_t)); |
3d1fc7fd MD |
143 | offset += sizeof(uint32_t); /* timestamp */ |
144 | } else { | |
145 | /* Align extended struct on largest member */ | |
1dbfff0c | 146 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd | 147 | offset += sizeof(uint32_t); /* id */ |
1dbfff0c | 148 | offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
149 | offset += sizeof(uint64_t); /* timestamp */ |
150 | } | |
151 | break; | |
152 | default: | |
9f3fdbc6 | 153 | padding = 0; |
3d1fc7fd MD |
154 | WARN_ON_ONCE(1); |
155 | } | |
156 | offset += ctx_get_size(offset, event->ctx); | |
7dd08bec | 157 | offset += ctx_get_size(offset, lttng_chan->ctx); |
3d1fc7fd MD |
158 | |
159 | *pre_header_padding = padding; | |
160 | return offset - orig_offset; | |
161 | } | |
162 | ||
9f3fdbc6 | 163 | #include "../libringbuffer/api.h" |
3d1fc7fd | 164 | |
9f3fdbc6 | 165 | static |
7dd08bec | 166 | void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 167 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
168 | uint32_t event_id); |
169 | ||
170 | /* | |
7dd08bec | 171 | * lttng_write_event_header |
3d1fc7fd MD |
172 | * |
173 | * Writes the event header to the offset (already aligned on 32-bits). | |
174 | * | |
175 | * @config: ring buffer instance configuration | |
176 | * @ctx: reservation context | |
177 | * @event_id: event ID | |
178 | */ | |
179 | static __inline__ | |
7dd08bec | 180 | void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 181 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
182 | uint32_t event_id) |
183 | { | |
7dd08bec MD |
184 | struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); |
185 | struct lttng_event *event = ctx->priv; | |
3d1fc7fd | 186 | |
b5a3dfa5 | 187 | if (caa_unlikely(ctx->rflags)) |
3d1fc7fd MD |
188 | goto slow_path; |
189 | ||
7dd08bec | 190 | switch (lttng_chan->header_type) { |
3d1fc7fd MD |
191 | case 1: /* compact */ |
192 | { | |
193 | uint32_t id_time = 0; | |
194 | ||
79dfbf42 MD |
195 | bt_bitfield_write(&id_time, uint32_t, |
196 | 0, | |
197 | LTTNG_COMPACT_EVENT_BITS, | |
198 | event_id); | |
199 | bt_bitfield_write(&id_time, uint32_t, | |
200 | LTTNG_COMPACT_EVENT_BITS, | |
201 | LTTNG_COMPACT_TSC_BITS, | |
202 | ctx->tsc); | |
3d1fc7fd MD |
203 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); |
204 | break; | |
205 | } | |
206 | case 2: /* large */ | |
207 | { | |
208 | uint32_t timestamp = (uint32_t) ctx->tsc; | |
209 | uint16_t id = event_id; | |
210 | ||
211 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
1dbfff0c | 212 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint32_t)); |
3d1fc7fd MD |
213 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
214 | break; | |
215 | } | |
216 | default: | |
217 | WARN_ON_ONCE(1); | |
218 | } | |
219 | ||
7dd08bec MD |
220 | ctx_record(ctx, lttng_chan, lttng_chan->ctx); |
221 | ctx_record(ctx, lttng_chan, event->ctx); | |
d3b2c3e0 | 222 | lib_ring_buffer_align_ctx(ctx, ctx->largest_align); |
3d1fc7fd MD |
223 | |
224 | return; | |
225 | ||
226 | slow_path: | |
7dd08bec | 227 | lttng_write_event_header_slow(config, ctx, event_id); |
3d1fc7fd MD |
228 | } |
229 | ||
9f3fdbc6 | 230 | static |
7dd08bec | 231 | void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 232 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
233 | uint32_t event_id) |
234 | { | |
7dd08bec MD |
235 | struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); |
236 | struct lttng_event *event = ctx->priv; | |
3d1fc7fd | 237 | |
7dd08bec | 238 | switch (lttng_chan->header_type) { |
3d1fc7fd | 239 | case 1: /* compact */ |
7dd08bec | 240 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
241 | uint32_t id_time = 0; |
242 | ||
79dfbf42 MD |
243 | bt_bitfield_write(&id_time, uint32_t, |
244 | 0, | |
245 | LTTNG_COMPACT_EVENT_BITS, | |
246 | event_id); | |
247 | bt_bitfield_write(&id_time, uint32_t, | |
248 | LTTNG_COMPACT_EVENT_BITS, | |
249 | LTTNG_COMPACT_TSC_BITS, | |
250 | ctx->tsc); | |
3d1fc7fd MD |
251 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); |
252 | } else { | |
253 | uint8_t id = 0; | |
254 | uint64_t timestamp = ctx->tsc; | |
255 | ||
79dfbf42 MD |
256 | bt_bitfield_write(&id, uint8_t, |
257 | 0, | |
258 | LTTNG_COMPACT_EVENT_BITS, | |
259 | 31); | |
3d1fc7fd MD |
260 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
261 | /* Align extended struct on largest member */ | |
1dbfff0c | 262 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd | 263 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
1dbfff0c | 264 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
265 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
266 | } | |
267 | break; | |
268 | case 2: /* large */ | |
269 | { | |
7dd08bec | 270 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
271 | uint32_t timestamp = (uint32_t) ctx->tsc; |
272 | uint16_t id = event_id; | |
273 | ||
274 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
1dbfff0c | 275 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint32_t)); |
3d1fc7fd MD |
276 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
277 | } else { | |
278 | uint16_t id = 65535; | |
279 | uint64_t timestamp = ctx->tsc; | |
280 | ||
281 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
282 | /* Align extended struct on largest member */ | |
1dbfff0c | 283 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd | 284 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
1dbfff0c | 285 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); |
3d1fc7fd MD |
286 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
287 | } | |
288 | break; | |
289 | } | |
290 | default: | |
291 | WARN_ON_ONCE(1); | |
292 | } | |
7dd08bec MD |
293 | ctx_record(ctx, lttng_chan, lttng_chan->ctx); |
294 | ctx_record(ctx, lttng_chan, event->ctx); | |
d3b2c3e0 | 295 | lib_ring_buffer_align_ctx(ctx, ctx->largest_align); |
3d1fc7fd MD |
296 | } |
297 | ||
4cfec15c | 298 | static const struct lttng_ust_lib_ring_buffer_config client_config; |
3d1fc7fd | 299 | |
23c8854a | 300 | static uint64_t client_ring_buffer_clock_read(struct channel *chan) |
3d1fc7fd MD |
301 | { |
302 | return lib_ring_buffer_clock_read(chan); | |
303 | } | |
304 | ||
305 | static | |
4cfec15c | 306 | size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, |
3d1fc7fd MD |
307 | struct channel *chan, size_t offset, |
308 | size_t *pre_header_padding, | |
4cfec15c | 309 | struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
310 | { |
311 | return record_header_size(config, chan, offset, | |
312 | pre_header_padding, ctx); | |
313 | } | |
314 | ||
315 | /** | |
316 | * client_packet_header_size - called on buffer-switch to a new sub-buffer | |
317 | * | |
318 | * Return header size without padding after the structure. Don't use packed | |
319 | * structure because gcc generates inefficient code on some architectures | |
320 | * (powerpc, mips..) | |
321 | */ | |
322 | static size_t client_packet_header_size(void) | |
323 | { | |
324 | return offsetof(struct packet_header, ctx.header_end); | |
325 | } | |
326 | ||
23c8854a | 327 | static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc, |
1d498196 | 328 | unsigned int subbuf_idx, |
38fae1d3 | 329 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 330 | { |
1d498196 | 331 | struct channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
332 | struct packet_header *header = |
333 | (struct packet_header *) | |
334 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
335 | subbuf_idx * chan->backend.subbuf_size, |
336 | handle); | |
7dd08bec | 337 | struct lttng_channel *lttng_chan = channel_get_private(chan); |
3d1fc7fd MD |
338 | |
339 | header->magic = CTF_MAGIC_NUMBER; | |
7dd08bec MD |
340 | memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid)); |
341 | header->stream_id = lttng_chan->id; | |
3d1fc7fd MD |
342 | header->ctx.timestamp_begin = tsc; |
343 | header->ctx.timestamp_end = 0; | |
0c00a107 MD |
344 | header->ctx.content_size = ~0ULL; /* for debugging */ |
345 | header->ctx.packet_size = ~0ULL; | |
3d1fc7fd | 346 | header->ctx.events_discarded = 0; |
3d1fc7fd MD |
347 | header->ctx.cpu_id = buf->backend.cpu; |
348 | } | |
349 | ||
350 | /* | |
351 | * offset is assumed to never be 0 here : never deliver a completely empty | |
352 | * subbuffer. data_size is between 1 and subbuf_size. | |
353 | */ | |
23c8854a | 354 | static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc, |
1d498196 | 355 | unsigned int subbuf_idx, unsigned long data_size, |
38fae1d3 | 356 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 357 | { |
1d498196 | 358 | struct channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
359 | struct packet_header *header = |
360 | (struct packet_header *) | |
361 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
362 | subbuf_idx * chan->backend.subbuf_size, |
363 | handle); | |
3d1fc7fd MD |
364 | unsigned long records_lost = 0; |
365 | ||
366 | header->ctx.timestamp_end = tsc; | |
b1830883 MD |
367 | header->ctx.content_size = |
368 | (uint64_t) data_size * CHAR_BIT; /* in bits */ | |
369 | header->ctx.packet_size = | |
370 | (uint64_t) PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
04489ab4 MD |
371 | |
372 | records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf); | |
3d1fc7fd MD |
373 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); |
374 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
375 | header->ctx.events_discarded = records_lost; | |
376 | } | |
377 | ||
4cfec15c | 378 | static int client_buffer_create(struct lttng_ust_lib_ring_buffer *buf, void *priv, |
38fae1d3 | 379 | int cpu, const char *name, struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
380 | { |
381 | return 0; | |
382 | } | |
383 | ||
4cfec15c | 384 | static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf, void *priv, int cpu, struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
385 | { |
386 | } | |
387 | ||
4cfec15c | 388 | static const struct lttng_ust_lib_ring_buffer_config client_config = { |
3d1fc7fd MD |
389 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, |
390 | .cb.record_header_size = client_record_header_size, | |
391 | .cb.subbuffer_header_size = client_packet_header_size, | |
392 | .cb.buffer_begin = client_buffer_begin, | |
393 | .cb.buffer_end = client_buffer_end, | |
394 | .cb.buffer_create = client_buffer_create, | |
395 | .cb.buffer_finalize = client_buffer_finalize, | |
396 | ||
79dfbf42 | 397 | .tsc_bits = LTTNG_COMPACT_TSC_BITS, |
3d1fc7fd | 398 | .alloc = RING_BUFFER_ALLOC_PER_CPU, |
5d61a504 | 399 | .sync = RING_BUFFER_SYNC_GLOBAL, |
3d1fc7fd MD |
400 | .mode = RING_BUFFER_MODE_TEMPLATE, |
401 | .backend = RING_BUFFER_PAGE, | |
5d61a504 | 402 | .output = RING_BUFFER_MMAP, |
3d1fc7fd | 403 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
5d61a504 | 404 | .ipi = RING_BUFFER_NO_IPI_BARRIER, |
34a91bdb | 405 | .wakeup = LTTNG_CLIENT_WAKEUP, |
c1fca457 | 406 | .client_type = LTTNG_CLIENT_TYPE, |
3d1fc7fd MD |
407 | }; |
408 | ||
7a784989 | 409 | const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb; |
c1fca457 | 410 | |
3d1fc7fd | 411 | static |
7dd08bec | 412 | struct lttng_channel *_channel_create(const char *name, |
a3f61e7f | 413 | void *buf_addr, |
3d1fc7fd MD |
414 | size_t subbuf_size, size_t num_subbuf, |
415 | unsigned int switch_timer_interval, | |
193183fb | 416 | unsigned int read_timer_interval, |
6ca18e66 MD |
417 | unsigned char *uuid, |
418 | uint32_t chan_id) | |
3d1fc7fd | 419 | { |
74d81a6c | 420 | struct lttng_channel chan_priv_init; |
a3f61e7f | 421 | struct lttng_ust_shm_handle *handle; |
74d81a6c MD |
422 | struct lttng_channel *lttng_chan; |
423 | void *priv; | |
a3f61e7f | 424 | |
74d81a6c MD |
425 | memset(&chan_priv_init, 0, sizeof(chan_priv_init)); |
426 | memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN); | |
6ca18e66 | 427 | chan_priv_init.id = chan_id; |
a3f61e7f | 428 | handle = channel_create(&client_config, name, |
8824f307 MD |
429 | &priv, __alignof__(struct lttng_channel), |
430 | sizeof(struct lttng_channel), | |
74d81a6c | 431 | &chan_priv_init, |
a3f61e7f | 432 | buf_addr, subbuf_size, num_subbuf, |
74d81a6c | 433 | switch_timer_interval, read_timer_interval); |
a3f61e7f | 434 | if (!handle) |
afdf9825 | 435 | return NULL; |
7dd08bec MD |
436 | lttng_chan = priv; |
437 | lttng_chan->handle = handle; | |
74d81a6c | 438 | lttng_chan->chan = shmp(handle, handle->chan); |
7dd08bec | 439 | return lttng_chan; |
3d1fc7fd MD |
440 | } |
441 | ||
442 | static | |
74d81a6c | 443 | void lttng_channel_destroy(struct lttng_channel *chan) |
3d1fc7fd | 444 | { |
74d81a6c | 445 | channel_destroy(chan->chan, chan->handle, 1); |
3d1fc7fd MD |
446 | } |
447 | ||
448 | static | |
7dd08bec | 449 | int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
450 | uint32_t event_id) |
451 | { | |
7dd08bec | 452 | struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); |
3d1fc7fd MD |
453 | int ret, cpu; |
454 | ||
455 | cpu = lib_ring_buffer_get_cpu(&client_config); | |
456 | if (cpu < 0) | |
457 | return -EPERM; | |
458 | ctx->cpu = cpu; | |
459 | ||
7dd08bec | 460 | switch (lttng_chan->header_type) { |
3d1fc7fd MD |
461 | case 1: /* compact */ |
462 | if (event_id > 30) | |
7dd08bec | 463 | ctx->rflags |= LTTNG_RFLAG_EXTENDED; |
3d1fc7fd MD |
464 | break; |
465 | case 2: /* large */ | |
466 | if (event_id > 65534) | |
7dd08bec | 467 | ctx->rflags |= LTTNG_RFLAG_EXTENDED; |
3d1fc7fd MD |
468 | break; |
469 | default: | |
470 | WARN_ON_ONCE(1); | |
471 | } | |
472 | ||
473 | ret = lib_ring_buffer_reserve(&client_config, ctx); | |
474 | if (ret) | |
475 | goto put; | |
7dd08bec | 476 | lttng_write_event_header(&client_config, ctx, event_id); |
3d1fc7fd MD |
477 | return 0; |
478 | put: | |
479 | lib_ring_buffer_put_cpu(&client_config); | |
480 | return ret; | |
481 | } | |
482 | ||
483 | static | |
7dd08bec | 484 | void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
485 | { |
486 | lib_ring_buffer_commit(&client_config, ctx); | |
487 | lib_ring_buffer_put_cpu(&client_config); | |
488 | } | |
489 | ||
490 | static | |
7dd08bec | 491 | void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src, |
3d1fc7fd MD |
492 | size_t len) |
493 | { | |
494 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
495 | } | |
496 | ||
9f3fdbc6 | 497 | #if 0 |
3d1fc7fd | 498 | static |
7dd08bec | 499 | wait_queue_head_t *lttng_get_reader_wait_queue(struct channel *chan) |
3d1fc7fd MD |
500 | { |
501 | return &chan->read_wait; | |
502 | } | |
503 | ||
504 | static | |
7dd08bec | 505 | wait_queue_head_t *lttng_get_hp_wait_queue(struct channel *chan) |
3d1fc7fd MD |
506 | { |
507 | return &chan->hp_wait; | |
508 | } | |
9f3fdbc6 | 509 | #endif //0 |
3d1fc7fd MD |
510 | |
511 | static | |
7dd08bec | 512 | int lttng_is_finalized(struct channel *chan) |
3d1fc7fd MD |
513 | { |
514 | return lib_ring_buffer_channel_is_finalized(chan); | |
515 | } | |
516 | ||
517 | static | |
7dd08bec | 518 | int lttng_is_disabled(struct channel *chan) |
3d1fc7fd MD |
519 | { |
520 | return lib_ring_buffer_channel_is_disabled(chan); | |
521 | } | |
522 | ||
43861eab | 523 | static |
7dd08bec | 524 | int lttng_flush_buffer(struct channel *chan, struct lttng_ust_shm_handle *handle) |
43861eab | 525 | { |
4cfec15c | 526 | struct lttng_ust_lib_ring_buffer *buf; |
43861eab MD |
527 | int cpu; |
528 | ||
529 | for_each_channel_cpu(cpu, chan) { | |
74d81a6c MD |
530 | int shm_fd, wait_fd, wakeup_fd; |
531 | uint64_t memory_map_size; | |
43861eab MD |
532 | |
533 | buf = channel_get_ring_buffer(&client_config, chan, | |
534 | cpu, handle, &shm_fd, &wait_fd, | |
74d81a6c | 535 | &wakeup_fd, &memory_map_size); |
43861eab MD |
536 | lib_ring_buffer_switch(&client_config, buf, |
537 | SWITCH_ACTIVE, handle); | |
538 | } | |
539 | return 0; | |
540 | } | |
541 | ||
7dd08bec | 542 | static struct lttng_transport lttng_relay_transport = { |
818173b9 | 543 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap", |
3d1fc7fd MD |
544 | .ops = { |
545 | .channel_create = _channel_create, | |
7dd08bec | 546 | .channel_destroy = lttng_channel_destroy, |
7dd08bec MD |
547 | .event_reserve = lttng_event_reserve, |
548 | .event_commit = lttng_event_commit, | |
549 | .event_write = lttng_event_write, | |
3d1fc7fd | 550 | .packet_avail_size = NULL, /* Would be racy anyway */ |
7dd08bec MD |
551 | //.get_reader_wait_queue = lttng_get_reader_wait_queue, |
552 | //.get_hp_wait_queue = lttng_get_hp_wait_queue, | |
553 | .is_finalized = lttng_is_finalized, | |
554 | .is_disabled = lttng_is_disabled, | |
555 | .flush_buffer = lttng_flush_buffer, | |
3d1fc7fd | 556 | }, |
74d81a6c | 557 | .client_config = &client_config, |
3d1fc7fd MD |
558 | }; |
559 | ||
edaa1431 | 560 | void RING_BUFFER_MODE_TEMPLATE_INIT(void) |
3d1fc7fd | 561 | { |
34a91bdb MD |
562 | DBG("LTT : ltt ring buffer client \"%s\" init\n", |
563 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 564 | lttng_transport_register(<tng_relay_transport); |
3d1fc7fd MD |
565 | } |
566 | ||
edaa1431 | 567 | void RING_BUFFER_MODE_TEMPLATE_EXIT(void) |
3d1fc7fd | 568 | { |
34a91bdb MD |
569 | DBG("LTT : ltt ring buffer client \"%s\" exit\n", |
570 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 571 | lttng_transport_unregister(<tng_relay_transport); |
3d1fc7fd | 572 | } |