Commit | Line | Data |
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3d1fc7fd MD |
1 | /* |
2 | * ltt-ring-buffer-client.h | |
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" |
3d1fc7fd | 27 | #include "ltt-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 | */ | |
578ce73a | 46 | uint8_t uuid[16]; |
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 */ | |
53 | uint32_t events_discarded; /* | |
54 | * Events lost in this subbuffer since | |
55 | * the beginning of the trace. | |
56 | * (may overflow) | |
57 | */ | |
58 | uint32_t content_size; /* Size of data in subbuffer */ | |
59 | uint32_t packet_size; /* Subbuffer size (include padding) */ | |
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, |
3d1fc7fd MD |
86 | struct ltt_channel *chan, |
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 MD |
115 | { |
116 | struct ltt_channel *ltt_chan = channel_get_private(chan); | |
117 | struct ltt_event *event = ctx->priv; | |
118 | size_t orig_offset = offset; | |
119 | size_t padding; | |
120 | ||
121 | switch (ltt_chan->header_type) { | |
122 | case 1: /* compact */ | |
1dbfff0c | 123 | padding = lib_ring_buffer_align(offset, lttng_alignof(uint32_t)); |
3d1fc7fd MD |
124 | offset += padding; |
125 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { | |
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); | |
141 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_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); | |
157 | offset += ctx_get_size(offset, ltt_chan->ctx); | |
158 | ||
159 | *pre_header_padding = padding; | |
160 | return offset - orig_offset; | |
161 | } | |
162 | ||
9f3fdbc6 | 163 | #include "../libringbuffer/api.h" |
3d1fc7fd | 164 | |
9f3fdbc6 | 165 | static |
4cfec15c MD |
166 | void ltt_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
167 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
3d1fc7fd MD |
168 | uint32_t event_id); |
169 | ||
170 | /* | |
171 | * ltt_write_event_header | |
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__ | |
4cfec15c MD |
180 | void ltt_write_event_header(const struct lttng_ust_lib_ring_buffer_config *config, |
181 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
3d1fc7fd MD |
182 | uint32_t event_id) |
183 | { | |
184 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); | |
185 | struct ltt_event *event = ctx->priv; | |
186 | ||
b5a3dfa5 | 187 | if (caa_unlikely(ctx->rflags)) |
3d1fc7fd MD |
188 | goto slow_path; |
189 | ||
190 | switch (ltt_chan->header_type) { | |
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 | ||
3d1fc7fd | 220 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); |
1ea172a1 | 221 | ctx_record(ctx, ltt_chan, event->ctx); |
d3b2c3e0 | 222 | lib_ring_buffer_align_ctx(ctx, ctx->largest_align); |
3d1fc7fd MD |
223 | |
224 | return; | |
225 | ||
226 | slow_path: | |
227 | ltt_write_event_header_slow(config, ctx, event_id); | |
228 | } | |
229 | ||
9f3fdbc6 | 230 | static |
4cfec15c MD |
231 | void ltt_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
232 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
3d1fc7fd MD |
233 | uint32_t event_id) |
234 | { | |
235 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); | |
236 | struct ltt_event *event = ctx->priv; | |
237 | ||
238 | switch (ltt_chan->header_type) { | |
239 | case 1: /* compact */ | |
240 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { | |
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 | { | |
270 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { | |
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 | } | |
3d1fc7fd | 293 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); |
1ea172a1 | 294 | ctx_record(ctx, ltt_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); | |
3d1fc7fd | 337 | struct ltt_channel *ltt_chan = channel_get_private(chan); |
3d1fc7fd MD |
338 | |
339 | header->magic = CTF_MAGIC_NUMBER; | |
a3f61e7f | 340 | memcpy(header->uuid, ltt_chan->uuid, sizeof(ltt_chan->uuid)); |
3d1fc7fd MD |
341 | header->stream_id = ltt_chan->id; |
342 | header->ctx.timestamp_begin = tsc; | |
343 | header->ctx.timestamp_end = 0; | |
344 | header->ctx.events_discarded = 0; | |
345 | header->ctx.content_size = 0xFFFFFFFF; /* for debugging */ | |
346 | header->ctx.packet_size = 0xFFFFFFFF; | |
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; | |
367 | header->ctx.content_size = data_size * CHAR_BIT; /* in bits */ | |
368 | header->ctx.packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
9dcb02ef MD |
369 | /* |
370 | * We do not care about the records lost count, because the metadata | |
371 | * channel waits and retry. | |
372 | */ | |
373 | (void) lib_ring_buffer_get_records_lost_full(&client_config, buf); | |
3d1fc7fd MD |
374 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); |
375 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
376 | header->ctx.events_discarded = records_lost; | |
377 | } | |
378 | ||
4cfec15c | 379 | static int client_buffer_create(struct lttng_ust_lib_ring_buffer *buf, void *priv, |
38fae1d3 | 380 | int cpu, const char *name, struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
381 | { |
382 | return 0; | |
383 | } | |
384 | ||
4cfec15c | 385 | static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf, void *priv, int cpu, struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
386 | { |
387 | } | |
388 | ||
4cfec15c | 389 | static const struct lttng_ust_lib_ring_buffer_config client_config = { |
3d1fc7fd MD |
390 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, |
391 | .cb.record_header_size = client_record_header_size, | |
392 | .cb.subbuffer_header_size = client_packet_header_size, | |
393 | .cb.buffer_begin = client_buffer_begin, | |
394 | .cb.buffer_end = client_buffer_end, | |
395 | .cb.buffer_create = client_buffer_create, | |
396 | .cb.buffer_finalize = client_buffer_finalize, | |
397 | ||
79dfbf42 | 398 | .tsc_bits = LTTNG_COMPACT_TSC_BITS, |
3d1fc7fd | 399 | .alloc = RING_BUFFER_ALLOC_PER_CPU, |
5d61a504 | 400 | .sync = RING_BUFFER_SYNC_GLOBAL, |
3d1fc7fd MD |
401 | .mode = RING_BUFFER_MODE_TEMPLATE, |
402 | .backend = RING_BUFFER_PAGE, | |
5d61a504 | 403 | .output = RING_BUFFER_MMAP, |
3d1fc7fd | 404 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
5d61a504 MD |
405 | .ipi = RING_BUFFER_NO_IPI_BARRIER, |
406 | .wakeup = RING_BUFFER_WAKEUP_BY_WRITER, | |
c1fca457 | 407 | .client_type = LTTNG_CLIENT_TYPE, |
3d1fc7fd MD |
408 | }; |
409 | ||
7a784989 | 410 | const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb; |
c1fca457 | 411 | |
3d1fc7fd | 412 | static |
1d498196 | 413 | struct ltt_channel *_channel_create(const char *name, |
a3f61e7f | 414 | void *buf_addr, |
3d1fc7fd MD |
415 | size_t subbuf_size, size_t num_subbuf, |
416 | unsigned int switch_timer_interval, | |
193183fb | 417 | unsigned int read_timer_interval, |
ef9ff354 MD |
418 | int **shm_fd, int **wait_fd, |
419 | uint64_t **memory_map_size, | |
d028eddb | 420 | struct ltt_channel *chan_priv_init) |
3d1fc7fd | 421 | { |
a3f61e7f MD |
422 | void *priv; |
423 | struct ltt_channel *ltt_chan = NULL; | |
424 | struct lttng_ust_shm_handle *handle; | |
425 | ||
426 | handle = channel_create(&client_config, name, | |
427 | &priv, __alignof__(*ltt_chan), sizeof(*ltt_chan), | |
d028eddb | 428 | chan_priv_init, |
a3f61e7f MD |
429 | buf_addr, subbuf_size, num_subbuf, |
430 | switch_timer_interval, read_timer_interval, | |
431 | shm_fd, wait_fd, memory_map_size); | |
432 | if (!handle) | |
afdf9825 | 433 | return NULL; |
a3f61e7f MD |
434 | ltt_chan = priv; |
435 | ltt_chan->handle = handle; | |
dc613eb9 | 436 | ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan); |
1d498196 | 437 | return ltt_chan; |
3d1fc7fd MD |
438 | } |
439 | ||
440 | static | |
1d498196 | 441 | void ltt_channel_destroy(struct ltt_channel *ltt_chan) |
3d1fc7fd | 442 | { |
824f40b8 | 443 | channel_destroy(ltt_chan->chan, ltt_chan->handle, 0); |
3d1fc7fd MD |
444 | } |
445 | ||
446 | static | |
4cfec15c | 447 | struct lttng_ust_lib_ring_buffer *ltt_buffer_read_open(struct channel *chan, |
38fae1d3 | 448 | struct lttng_ust_shm_handle *handle, |
ef9ff354 MD |
449 | int **shm_fd, int **wait_fd, |
450 | uint64_t **memory_map_size) | |
3d1fc7fd | 451 | { |
4cfec15c | 452 | struct lttng_ust_lib_ring_buffer *buf; |
3d1fc7fd MD |
453 | int cpu; |
454 | ||
455 | for_each_channel_cpu(cpu, chan) { | |
381c0f1e MD |
456 | buf = channel_get_ring_buffer(&client_config, chan, |
457 | cpu, handle, shm_fd, wait_fd, | |
458 | memory_map_size); | |
824f40b8 | 459 | if (!lib_ring_buffer_open_read(buf, handle, 0)) |
3d1fc7fd MD |
460 | return buf; |
461 | } | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | static | |
4cfec15c | 466 | void ltt_buffer_read_close(struct lttng_ust_lib_ring_buffer *buf, |
38fae1d3 | 467 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 468 | { |
824f40b8 | 469 | lib_ring_buffer_release_read(buf, handle, 0); |
3d1fc7fd MD |
470 | } |
471 | ||
472 | static | |
4cfec15c | 473 | int ltt_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
3d1fc7fd MD |
474 | uint32_t event_id) |
475 | { | |
476 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); | |
477 | int ret, cpu; | |
478 | ||
479 | cpu = lib_ring_buffer_get_cpu(&client_config); | |
480 | if (cpu < 0) | |
481 | return -EPERM; | |
482 | ctx->cpu = cpu; | |
483 | ||
484 | switch (ltt_chan->header_type) { | |
485 | case 1: /* compact */ | |
486 | if (event_id > 30) | |
487 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
488 | break; | |
489 | case 2: /* large */ | |
490 | if (event_id > 65534) | |
491 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
492 | break; | |
493 | default: | |
494 | WARN_ON_ONCE(1); | |
495 | } | |
496 | ||
497 | ret = lib_ring_buffer_reserve(&client_config, ctx); | |
498 | if (ret) | |
499 | goto put; | |
500 | ltt_write_event_header(&client_config, ctx, event_id); | |
501 | return 0; | |
502 | put: | |
503 | lib_ring_buffer_put_cpu(&client_config); | |
504 | return ret; | |
505 | } | |
506 | ||
507 | static | |
4cfec15c | 508 | void ltt_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
509 | { |
510 | lib_ring_buffer_commit(&client_config, ctx); | |
511 | lib_ring_buffer_put_cpu(&client_config); | |
512 | } | |
513 | ||
514 | static | |
4cfec15c | 515 | void ltt_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src, |
3d1fc7fd MD |
516 | size_t len) |
517 | { | |
518 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
519 | } | |
520 | ||
9f3fdbc6 | 521 | #if 0 |
3d1fc7fd MD |
522 | static |
523 | wait_queue_head_t *ltt_get_reader_wait_queue(struct channel *chan) | |
524 | { | |
525 | return &chan->read_wait; | |
526 | } | |
527 | ||
528 | static | |
529 | wait_queue_head_t *ltt_get_hp_wait_queue(struct channel *chan) | |
530 | { | |
531 | return &chan->hp_wait; | |
532 | } | |
9f3fdbc6 | 533 | #endif //0 |
3d1fc7fd MD |
534 | |
535 | static | |
536 | int ltt_is_finalized(struct channel *chan) | |
537 | { | |
538 | return lib_ring_buffer_channel_is_finalized(chan); | |
539 | } | |
540 | ||
541 | static | |
542 | int ltt_is_disabled(struct channel *chan) | |
543 | { | |
544 | return lib_ring_buffer_channel_is_disabled(chan); | |
545 | } | |
546 | ||
43861eab | 547 | static |
38fae1d3 | 548 | int ltt_flush_buffer(struct channel *chan, struct lttng_ust_shm_handle *handle) |
43861eab | 549 | { |
4cfec15c | 550 | struct lttng_ust_lib_ring_buffer *buf; |
43861eab MD |
551 | int cpu; |
552 | ||
553 | for_each_channel_cpu(cpu, chan) { | |
ef9ff354 MD |
554 | int *shm_fd, *wait_fd; |
555 | uint64_t *memory_map_size; | |
43861eab MD |
556 | |
557 | buf = channel_get_ring_buffer(&client_config, chan, | |
558 | cpu, handle, &shm_fd, &wait_fd, | |
559 | &memory_map_size); | |
560 | lib_ring_buffer_switch(&client_config, buf, | |
561 | SWITCH_ACTIVE, handle); | |
562 | } | |
563 | return 0; | |
564 | } | |
565 | ||
3d1fc7fd | 566 | static struct ltt_transport ltt_relay_transport = { |
818173b9 | 567 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap", |
3d1fc7fd MD |
568 | .ops = { |
569 | .channel_create = _channel_create, | |
570 | .channel_destroy = ltt_channel_destroy, | |
571 | .buffer_read_open = ltt_buffer_read_open, | |
572 | .buffer_read_close = ltt_buffer_read_close, | |
573 | .event_reserve = ltt_event_reserve, | |
574 | .event_commit = ltt_event_commit, | |
575 | .event_write = ltt_event_write, | |
576 | .packet_avail_size = NULL, /* Would be racy anyway */ | |
9f3fdbc6 MD |
577 | //.get_reader_wait_queue = ltt_get_reader_wait_queue, |
578 | //.get_hp_wait_queue = ltt_get_hp_wait_queue, | |
3d1fc7fd MD |
579 | .is_finalized = ltt_is_finalized, |
580 | .is_disabled = ltt_is_disabled, | |
43d330a4 | 581 | .flush_buffer = ltt_flush_buffer, |
3d1fc7fd MD |
582 | }, |
583 | }; | |
584 | ||
edaa1431 | 585 | void RING_BUFFER_MODE_TEMPLATE_INIT(void) |
3d1fc7fd | 586 | { |
18c1cd87 | 587 | DBG("LTT : ltt ring buffer client init\n"); |
3d1fc7fd | 588 | ltt_transport_register(<t_relay_transport); |
3d1fc7fd MD |
589 | } |
590 | ||
edaa1431 | 591 | void RING_BUFFER_MODE_TEMPLATE_EXIT(void) |
3d1fc7fd | 592 | { |
18c1cd87 | 593 | DBG("LTT : ltt ring buffer client exit\n"); |
3d1fc7fd MD |
594 | ltt_transport_unregister(<t_relay_transport); |
595 | } |