Commit | Line | Data |
---|---|---|
7514523f | 1 | /* |
3d084699 | 2 | * ltt-ring-buffer-client.h |
7514523f MD |
3 | * |
4 | * Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
3d084699 | 6 | * LTTng lib ring buffer client template. |
7514523f MD |
7 | * |
8 | * Dual LGPL v2.1/GPL v2 license. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
c0e31d2e | 12 | #include <linux/types.h> |
9115fbdc | 13 | #include "lib/bitfield.h" |
b13f3ebe | 14 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
f3bc08c5 | 15 | #include "wrapper/trace-clock.h" |
c0e31d2e | 16 | #include "ltt-events.h" |
7514523f | 17 | #include "ltt-tracer.h" |
9115fbdc | 18 | #include "wrapper/ringbuffer/frontend_types.h" |
7514523f | 19 | |
d793d5e1 MD |
20 | /* |
21 | * Keep the natural field alignment for _each field_ within this structure if | |
22 | * you ever add/remove a field from this header. Packed attribute is not used | |
23 | * because gcc generates poor code on at least powerpc and mips. Don't ever | |
24 | * let gcc add padding between the structure elements. | |
25 | */ | |
9115fbdc | 26 | |
d793d5e1 | 27 | struct packet_header { |
9115fbdc | 28 | /* Trace packet header */ |
d793d5e1 MD |
29 | uint32_t magic; /* |
30 | * Trace magic number. | |
31 | * contains endianness information. | |
32 | */ | |
1ec3f75a | 33 | uint8_t uuid[16]; |
d793d5e1 | 34 | uint32_t stream_id; |
9115fbdc MD |
35 | |
36 | struct { | |
37 | /* Stream packet context */ | |
38 | uint64_t timestamp_begin; /* Cycle count at subbuffer start */ | |
39 | uint64_t timestamp_end; /* Cycle count at subbuffer end */ | |
40 | uint32_t events_discarded; /* | |
41 | * Events lost in this subbuffer since | |
42 | * the beginning of the trace. | |
43 | * (may overflow) | |
44 | */ | |
45 | uint32_t content_size; /* Size of data in subbuffer */ | |
46 | uint32_t packet_size; /* Subbuffer size (include padding) */ | |
47 | uint32_t cpu_id; /* CPU id associated with stream */ | |
48 | uint8_t header_end; /* End of header */ | |
49 | } ctx; | |
d793d5e1 MD |
50 | }; |
51 | ||
52 | ||
881833e3 MD |
53 | static inline notrace u64 lib_ring_buffer_clock_read(struct channel *chan) |
54 | { | |
55 | return trace_clock_read64(); | |
56 | } | |
57 | ||
f1676205 MD |
58 | static inline |
59 | size_t ctx_get_size(size_t offset, struct lttng_ctx *ctx) | |
60 | { | |
61 | int i; | |
62 | size_t orig_offset = offset; | |
63 | ||
64 | if (likely(!ctx)) | |
65 | return 0; | |
66 | for (i = 0; i < ctx->nr_fields; i++) | |
67 | offset += ctx->fields[i].get_size(offset); | |
68 | return offset - orig_offset; | |
69 | } | |
70 | ||
71 | static inline | |
72 | void ctx_record(struct lib_ring_buffer_ctx *bufctx, | |
73 | struct ltt_channel *chan, | |
74 | struct lttng_ctx *ctx) | |
75 | { | |
76 | int i; | |
77 | ||
78 | if (likely(!ctx)) | |
79 | return; | |
80 | for (i = 0; i < ctx->nr_fields; i++) | |
81 | ctx->fields[i].record(&ctx->fields[i], bufctx, chan); | |
82 | } | |
83 | ||
881833e3 MD |
84 | /* |
85 | * record_header_size - Calculate the header size and padding necessary. | |
86 | * @config: ring buffer instance configuration | |
87 | * @chan: channel | |
88 | * @offset: offset in the write buffer | |
881833e3 | 89 | * @pre_header_padding: padding to add before the header (output) |
881833e3 MD |
90 | * @ctx: reservation context |
91 | * | |
92 | * Returns the event header size (including padding). | |
93 | * | |
881833e3 MD |
94 | * The payload must itself determine its own alignment from the biggest type it |
95 | * contains. | |
96 | */ | |
97 | static __inline__ | |
98 | unsigned char record_header_size(const struct lib_ring_buffer_config *config, | |
99 | struct channel *chan, size_t offset, | |
64c796d8 | 100 | size_t *pre_header_padding, |
881833e3 MD |
101 | struct lib_ring_buffer_ctx *ctx) |
102 | { | |
9115fbdc | 103 | struct ltt_channel *ltt_chan = channel_get_private(chan); |
f1676205 | 104 | struct ltt_event *event = ctx->priv; |
881833e3 MD |
105 | size_t orig_offset = offset; |
106 | size_t padding; | |
107 | ||
9115fbdc MD |
108 | switch (ltt_chan->header_type) { |
109 | case 1: /* compact */ | |
110 | padding = lib_ring_buffer_align(offset, ltt_alignof(uint32_t)); | |
111 | offset += padding; | |
64c796d8 | 112 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
113 | offset += sizeof(uint32_t); /* id and timestamp */ |
114 | } else { | |
115 | /* Minimum space taken by 5-bit id */ | |
116 | offset += sizeof(uint8_t); | |
117 | /* Align extended struct on largest member */ | |
118 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
119 | offset += sizeof(uint32_t); /* id */ | |
120 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
121 | offset += sizeof(uint64_t); /* timestamp */ | |
122 | } | |
123 | break; | |
124 | case 2: /* large */ | |
125 | padding = lib_ring_buffer_align(offset, ltt_alignof(uint16_t)); | |
126 | offset += padding; | |
127 | offset += sizeof(uint16_t); | |
64c796d8 | 128 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
129 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint32_t)); |
130 | offset += sizeof(uint32_t); /* timestamp */ | |
131 | } else { | |
132 | /* Align extended struct on largest member */ | |
133 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
134 | offset += sizeof(uint32_t); /* id */ | |
135 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
136 | offset += sizeof(uint64_t); /* timestamp */ | |
881833e3 | 137 | } |
9115fbdc MD |
138 | break; |
139 | default: | |
64c796d8 | 140 | WARN_ON_ONCE(1); |
881833e3 | 141 | } |
f1676205 MD |
142 | offset += ctx_get_size(offset, event->ctx); |
143 | offset += ctx_get_size(offset, ltt_chan->ctx); | |
881833e3 MD |
144 | |
145 | *pre_header_padding = padding; | |
146 | return offset - orig_offset; | |
147 | } | |
148 | ||
149 | #include "wrapper/ringbuffer/api.h" | |
150 | ||
151 | extern | |
152 | void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, | |
153 | struct lib_ring_buffer_ctx *ctx, | |
64c796d8 | 154 | uint32_t event_id); |
881833e3 MD |
155 | |
156 | /* | |
157 | * ltt_write_event_header | |
158 | * | |
159 | * Writes the event header to the offset (already aligned on 32-bits). | |
160 | * | |
161 | * @config: ring buffer instance configuration | |
162 | * @ctx: reservation context | |
4e1f08f4 | 163 | * @event_id: event ID |
881833e3 MD |
164 | */ |
165 | static __inline__ | |
166 | void ltt_write_event_header(const struct lib_ring_buffer_config *config, | |
167 | struct lib_ring_buffer_ctx *ctx, | |
64c796d8 | 168 | uint32_t event_id) |
881833e3 | 169 | { |
9115fbdc | 170 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
f1676205 | 171 | struct ltt_event *event = ctx->priv; |
881833e3 MD |
172 | |
173 | if (unlikely(ctx->rflags)) | |
174 | goto slow_path; | |
175 | ||
9115fbdc MD |
176 | switch (ltt_chan->header_type) { |
177 | case 1: /* compact */ | |
178 | { | |
179 | uint32_t id_time = 0; | |
180 | ||
4e1f08f4 | 181 | bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); |
9115fbdc MD |
182 | bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); |
183 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); | |
184 | break; | |
185 | } | |
186 | case 2: /* large */ | |
187 | { | |
9115fbdc MD |
188 | uint32_t timestamp = (uint32_t) ctx->tsc; |
189 | ||
190 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); | |
191 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); | |
192 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
193 | break; | |
194 | } | |
195 | default: | |
64c796d8 | 196 | WARN_ON_ONCE(1); |
9115fbdc | 197 | } |
f1676205 MD |
198 | |
199 | ctx_record(ctx, ltt_chan, event->ctx); | |
200 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); | |
f1676205 | 201 | |
9115fbdc | 202 | return; |
881833e3 MD |
203 | |
204 | slow_path: | |
4e1f08f4 | 205 | ltt_write_event_header_slow(config, ctx, event_id); |
881833e3 MD |
206 | } |
207 | ||
881833e3 | 208 | void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, |
64c796d8 MD |
209 | struct lib_ring_buffer_ctx *ctx, |
210 | uint32_t event_id) | |
881833e3 | 211 | { |
9115fbdc | 212 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
f1676205 | 213 | struct ltt_event *event = ctx->priv; |
9115fbdc MD |
214 | |
215 | switch (ltt_chan->header_type) { | |
216 | case 1: /* compact */ | |
64c796d8 | 217 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
218 | uint32_t id_time = 0; |
219 | ||
4e1f08f4 | 220 | bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); |
9115fbdc MD |
221 | bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); |
222 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); | |
223 | } else { | |
224 | uint8_t id = 0; | |
9115fbdc MD |
225 | uint64_t timestamp = ctx->tsc; |
226 | ||
227 | bt_bitfield_write(&id, uint8_t, 0, 5, 31); | |
228 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
229 | /* Align extended struct on largest member */ | |
230 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
231 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); | |
232 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
233 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
234 | } | |
881833e3 | 235 | break; |
9115fbdc MD |
236 | case 2: /* large */ |
237 | { | |
64c796d8 | 238 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
239 | uint32_t timestamp = (uint32_t) ctx->tsc; |
240 | ||
241 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); | |
242 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); | |
243 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
244 | } else { | |
64c796d8 | 245 | uint16_t id = 65535; |
9115fbdc MD |
246 | uint64_t timestamp = ctx->tsc; |
247 | ||
64c796d8 | 248 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
9115fbdc MD |
249 | /* Align extended struct on largest member */ |
250 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
64c796d8 | 251 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
9115fbdc MD |
252 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); |
253 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
254 | } | |
881833e3 | 255 | break; |
881833e3 | 256 | } |
9115fbdc | 257 | default: |
64c796d8 | 258 | WARN_ON_ONCE(1); |
881833e3 | 259 | } |
f1676205 MD |
260 | ctx_record(ctx, ltt_chan, event->ctx); |
261 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); | |
881833e3 MD |
262 | } |
263 | ||
7514523f MD |
264 | static const struct lib_ring_buffer_config client_config; |
265 | ||
266 | static u64 client_ring_buffer_clock_read(struct channel *chan) | |
267 | { | |
268 | return lib_ring_buffer_clock_read(chan); | |
269 | } | |
270 | ||
1e2015dc | 271 | static |
7514523f MD |
272 | size_t client_record_header_size(const struct lib_ring_buffer_config *config, |
273 | struct channel *chan, size_t offset, | |
7514523f | 274 | size_t *pre_header_padding, |
7514523f MD |
275 | struct lib_ring_buffer_ctx *ctx) |
276 | { | |
64c796d8 MD |
277 | return record_header_size(config, chan, offset, |
278 | pre_header_padding, ctx); | |
7514523f MD |
279 | } |
280 | ||
281 | /** | |
1c25284c | 282 | * client_packet_header_size - called on buffer-switch to a new sub-buffer |
7514523f MD |
283 | * |
284 | * Return header size without padding after the structure. Don't use packed | |
285 | * structure because gcc generates inefficient code on some architectures | |
286 | * (powerpc, mips..) | |
287 | */ | |
1c25284c | 288 | static size_t client_packet_header_size(void) |
7514523f | 289 | { |
9115fbdc | 290 | return offsetof(struct packet_header, ctx.header_end); |
7514523f MD |
291 | } |
292 | ||
293 | static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc, | |
294 | unsigned int subbuf_idx) | |
295 | { | |
296 | struct channel *chan = buf->backend.chan; | |
1c25284c MD |
297 | struct packet_header *header = |
298 | (struct packet_header *) | |
7514523f MD |
299 | lib_ring_buffer_offset_address(&buf->backend, |
300 | subbuf_idx * chan->backend.subbuf_size); | |
9115fbdc MD |
301 | struct ltt_channel *ltt_chan = channel_get_private(chan); |
302 | struct ltt_session *session = ltt_chan->session; | |
7514523f | 303 | |
d793d5e1 | 304 | header->magic = CTF_MAGIC_NUMBER; |
1ec3f75a | 305 | memcpy(header->uuid, session->uuid.b, sizeof(session->uuid)); |
9115fbdc MD |
306 | header->stream_id = ltt_chan->id; |
307 | header->ctx.timestamp_begin = tsc; | |
308 | header->ctx.timestamp_end = 0; | |
309 | header->ctx.events_discarded = 0; | |
310 | header->ctx.content_size = 0xFFFFFFFF; /* for debugging */ | |
311 | header->ctx.packet_size = 0xFFFFFFFF; | |
312 | header->ctx.cpu_id = buf->backend.cpu; | |
7514523f MD |
313 | } |
314 | ||
315 | /* | |
316 | * offset is assumed to never be 0 here : never deliver a completely empty | |
317 | * subbuffer. data_size is between 1 and subbuf_size. | |
318 | */ | |
319 | static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc, | |
320 | unsigned int subbuf_idx, unsigned long data_size) | |
321 | { | |
322 | struct channel *chan = buf->backend.chan; | |
1c25284c MD |
323 | struct packet_header *header = |
324 | (struct packet_header *) | |
7514523f MD |
325 | lib_ring_buffer_offset_address(&buf->backend, |
326 | subbuf_idx * chan->backend.subbuf_size); | |
327 | unsigned long records_lost = 0; | |
328 | ||
9115fbdc | 329 | header->ctx.timestamp_end = tsc; |
05d32c64 MD |
330 | header->ctx.content_size = data_size * CHAR_BIT; /* in bits */ |
331 | header->ctx.packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
7514523f MD |
332 | records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf); |
333 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); | |
334 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
9115fbdc | 335 | header->ctx.events_discarded = records_lost; |
7514523f MD |
336 | } |
337 | ||
338 | static int client_buffer_create(struct lib_ring_buffer *buf, void *priv, | |
339 | int cpu, const char *name) | |
340 | { | |
1c25284c | 341 | return 0; |
7514523f MD |
342 | } |
343 | ||
344 | static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int cpu) | |
345 | { | |
7514523f MD |
346 | } |
347 | ||
348 | static const struct lib_ring_buffer_config client_config = { | |
349 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, | |
350 | .cb.record_header_size = client_record_header_size, | |
1c25284c | 351 | .cb.subbuffer_header_size = client_packet_header_size, |
7514523f MD |
352 | .cb.buffer_begin = client_buffer_begin, |
353 | .cb.buffer_end = client_buffer_end, | |
354 | .cb.buffer_create = client_buffer_create, | |
355 | .cb.buffer_finalize = client_buffer_finalize, | |
356 | ||
357 | .tsc_bits = 32, | |
358 | .alloc = RING_BUFFER_ALLOC_PER_CPU, | |
359 | .sync = RING_BUFFER_SYNC_PER_CPU, | |
3d084699 | 360 | .mode = RING_BUFFER_MODE_TEMPLATE, |
7514523f MD |
361 | .backend = RING_BUFFER_PAGE, |
362 | .output = RING_BUFFER_SPLICE, | |
363 | .oops = RING_BUFFER_OOPS_CONSISTENCY, | |
364 | .ipi = RING_BUFFER_IPI_BARRIER, | |
365 | .wakeup = RING_BUFFER_WAKEUP_BY_TIMER, | |
366 | }; | |
367 | ||
1e2015dc | 368 | static |
1c25284c | 369 | struct channel *_channel_create(const char *name, |
9115fbdc | 370 | struct ltt_channel *ltt_chan, void *buf_addr, |
1c25284c MD |
371 | size_t subbuf_size, size_t num_subbuf, |
372 | unsigned int switch_timer_interval, | |
373 | unsigned int read_timer_interval) | |
7514523f | 374 | { |
9115fbdc | 375 | return channel_create(&client_config, name, ltt_chan, buf_addr, |
7514523f MD |
376 | subbuf_size, num_subbuf, switch_timer_interval, |
377 | read_timer_interval); | |
7514523f MD |
378 | } |
379 | ||
1e2015dc | 380 | static |
7514523f MD |
381 | void ltt_channel_destroy(struct channel *chan) |
382 | { | |
7514523f | 383 | channel_destroy(chan); |
7514523f MD |
384 | } |
385 | ||
ad1c05e1 MD |
386 | static |
387 | struct lib_ring_buffer *ltt_buffer_read_open(struct channel *chan) | |
388 | { | |
389 | struct lib_ring_buffer *buf; | |
390 | int cpu; | |
391 | ||
1c25284c MD |
392 | for_each_channel_cpu(cpu, chan) { |
393 | buf = channel_get_ring_buffer(&client_config, chan, cpu); | |
ad1c05e1 MD |
394 | if (!lib_ring_buffer_open_read(buf)) |
395 | return buf; | |
396 | } | |
397 | return NULL; | |
398 | } | |
399 | ||
400 | static | |
1c25284c | 401 | void ltt_buffer_read_close(struct lib_ring_buffer *buf) |
ad1c05e1 MD |
402 | { |
403 | lib_ring_buffer_release_read(buf); | |
1c25284c MD |
404 | } |
405 | ||
c099397a | 406 | static |
4e1f08f4 | 407 | int ltt_event_reserve(struct lib_ring_buffer_ctx *ctx, |
64c796d8 | 408 | uint32_t event_id) |
1c25284c | 409 | { |
64c796d8 | 410 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
1c25284c MD |
411 | int ret, cpu; |
412 | ||
413 | cpu = lib_ring_buffer_get_cpu(&client_config); | |
414 | if (cpu < 0) | |
415 | return -EPERM; | |
416 | ctx->cpu = cpu; | |
417 | ||
64c796d8 MD |
418 | switch (ltt_chan->header_type) { |
419 | case 1: /* compact */ | |
420 | if (event_id > 30) | |
421 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
422 | break; | |
423 | case 2: /* large */ | |
424 | if (event_id > 65534) | |
425 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
426 | break; | |
427 | default: | |
428 | WARN_ON_ONCE(1); | |
429 | } | |
430 | ||
1c25284c MD |
431 | ret = lib_ring_buffer_reserve(&client_config, ctx); |
432 | if (ret) | |
433 | goto put; | |
4e1f08f4 MD |
434 | ltt_write_event_header(&client_config, ctx, event_id); |
435 | return 0; | |
1c25284c MD |
436 | put: |
437 | lib_ring_buffer_put_cpu(&client_config); | |
438 | return ret; | |
ad1c05e1 MD |
439 | } |
440 | ||
c099397a | 441 | static |
1c25284c MD |
442 | void ltt_event_commit(struct lib_ring_buffer_ctx *ctx) |
443 | { | |
444 | lib_ring_buffer_commit(&client_config, ctx); | |
445 | lib_ring_buffer_put_cpu(&client_config); | |
446 | } | |
447 | ||
c099397a | 448 | static |
e763dbf5 MD |
449 | void ltt_event_write(struct lib_ring_buffer_ctx *ctx, const void *src, |
450 | size_t len) | |
451 | { | |
452 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
453 | } | |
1c25284c | 454 | |
c099397a MD |
455 | static |
456 | wait_queue_head_t *ltt_get_reader_wait_queue(struct ltt_channel *chan) | |
457 | { | |
458 | return &chan->chan->read_wait; | |
459 | } | |
460 | ||
7514523f | 461 | static struct ltt_transport ltt_relay_transport = { |
3d084699 | 462 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING, |
7514523f MD |
463 | .owner = THIS_MODULE, |
464 | .ops = { | |
1c25284c MD |
465 | .channel_create = _channel_create, |
466 | .channel_destroy = ltt_channel_destroy, | |
ad1c05e1 MD |
467 | .buffer_read_open = ltt_buffer_read_open, |
468 | .buffer_read_close = ltt_buffer_read_close, | |
1c25284c MD |
469 | .event_reserve = ltt_event_reserve, |
470 | .event_commit = ltt_event_commit, | |
e763dbf5 | 471 | .event_write = ltt_event_write, |
1ec3f75a | 472 | .packet_avail_size = NULL, /* Would be racy anyway */ |
c099397a | 473 | .get_reader_wait_queue = ltt_get_reader_wait_queue, |
7514523f MD |
474 | }, |
475 | }; | |
476 | ||
3d084699 | 477 | static int __init ltt_ring_buffer_client_init(void) |
7514523f | 478 | { |
a509e133 MD |
479 | /* |
480 | * This vmalloc sync all also takes care of the lib ring buffer | |
481 | * vmalloc'd module pages when it is built as a module into LTTng. | |
482 | */ | |
6d2a620c | 483 | wrapper_vmalloc_sync_all(); |
7514523f MD |
484 | printk(KERN_INFO "LTT : ltt ring buffer client init\n"); |
485 | ltt_transport_register(<t_relay_transport); | |
486 | return 0; | |
487 | } | |
488 | ||
1c25284c MD |
489 | module_init(ltt_ring_buffer_client_init); |
490 | ||
3d084699 | 491 | static void __exit ltt_ring_buffer_client_exit(void) |
7514523f MD |
492 | { |
493 | printk(KERN_INFO "LTT : ltt ring buffer client exit\n"); | |
494 | ltt_transport_unregister(<t_relay_transport); | |
495 | } | |
496 | ||
1c25284c MD |
497 | module_exit(ltt_ring_buffer_client_exit); |
498 | ||
7514523f MD |
499 | MODULE_LICENSE("GPL and additional rights"); |
500 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
3d084699 MD |
501 | MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING |
502 | " client"); |