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: | |
1b2e041f | 140 | padding = 0; |
64c796d8 | 141 | WARN_ON_ONCE(1); |
881833e3 | 142 | } |
f1676205 MD |
143 | offset += ctx_get_size(offset, event->ctx); |
144 | offset += ctx_get_size(offset, ltt_chan->ctx); | |
881833e3 MD |
145 | |
146 | *pre_header_padding = padding; | |
147 | return offset - orig_offset; | |
148 | } | |
149 | ||
150 | #include "wrapper/ringbuffer/api.h" | |
151 | ||
152 | extern | |
153 | void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, | |
154 | struct lib_ring_buffer_ctx *ctx, | |
64c796d8 | 155 | uint32_t event_id); |
881833e3 MD |
156 | |
157 | /* | |
158 | * ltt_write_event_header | |
159 | * | |
160 | * Writes the event header to the offset (already aligned on 32-bits). | |
161 | * | |
162 | * @config: ring buffer instance configuration | |
163 | * @ctx: reservation context | |
4e1f08f4 | 164 | * @event_id: event ID |
881833e3 MD |
165 | */ |
166 | static __inline__ | |
167 | void ltt_write_event_header(const struct lib_ring_buffer_config *config, | |
168 | struct lib_ring_buffer_ctx *ctx, | |
64c796d8 | 169 | uint32_t event_id) |
881833e3 | 170 | { |
9115fbdc | 171 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
f1676205 | 172 | struct ltt_event *event = ctx->priv; |
881833e3 MD |
173 | |
174 | if (unlikely(ctx->rflags)) | |
175 | goto slow_path; | |
176 | ||
9115fbdc MD |
177 | switch (ltt_chan->header_type) { |
178 | case 1: /* compact */ | |
179 | { | |
180 | uint32_t id_time = 0; | |
181 | ||
4e1f08f4 | 182 | bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); |
9115fbdc MD |
183 | bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); |
184 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); | |
185 | break; | |
186 | } | |
187 | case 2: /* large */ | |
188 | { | |
9115fbdc | 189 | uint32_t timestamp = (uint32_t) ctx->tsc; |
7e855749 | 190 | uint16_t id = event_id; |
9115fbdc | 191 | |
7e855749 | 192 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
9115fbdc MD |
193 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); |
194 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
195 | break; | |
196 | } | |
197 | default: | |
64c796d8 | 198 | WARN_ON_ONCE(1); |
9115fbdc | 199 | } |
f1676205 MD |
200 | |
201 | ctx_record(ctx, ltt_chan, event->ctx); | |
202 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); | |
f1676205 | 203 | |
9115fbdc | 204 | return; |
881833e3 MD |
205 | |
206 | slow_path: | |
4e1f08f4 | 207 | ltt_write_event_header_slow(config, ctx, event_id); |
881833e3 MD |
208 | } |
209 | ||
881833e3 | 210 | void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, |
64c796d8 MD |
211 | struct lib_ring_buffer_ctx *ctx, |
212 | uint32_t event_id) | |
881833e3 | 213 | { |
9115fbdc | 214 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
f1676205 | 215 | struct ltt_event *event = ctx->priv; |
9115fbdc MD |
216 | |
217 | switch (ltt_chan->header_type) { | |
218 | case 1: /* compact */ | |
64c796d8 | 219 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
220 | uint32_t id_time = 0; |
221 | ||
4e1f08f4 | 222 | bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); |
9115fbdc MD |
223 | bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); |
224 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); | |
225 | } else { | |
226 | uint8_t id = 0; | |
9115fbdc MD |
227 | uint64_t timestamp = ctx->tsc; |
228 | ||
229 | bt_bitfield_write(&id, uint8_t, 0, 5, 31); | |
230 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
231 | /* Align extended struct on largest member */ | |
232 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
233 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); | |
234 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
235 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
236 | } | |
881833e3 | 237 | break; |
9115fbdc MD |
238 | case 2: /* large */ |
239 | { | |
64c796d8 | 240 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc | 241 | uint32_t timestamp = (uint32_t) ctx->tsc; |
7e855749 | 242 | uint16_t id = event_id; |
9115fbdc | 243 | |
7e855749 | 244 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
9115fbdc MD |
245 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); |
246 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
247 | } else { | |
64c796d8 | 248 | uint16_t id = 65535; |
9115fbdc MD |
249 | uint64_t timestamp = ctx->tsc; |
250 | ||
64c796d8 | 251 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
9115fbdc MD |
252 | /* Align extended struct on largest member */ |
253 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
64c796d8 | 254 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
9115fbdc MD |
255 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); |
256 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
257 | } | |
881833e3 | 258 | break; |
881833e3 | 259 | } |
9115fbdc | 260 | default: |
64c796d8 | 261 | WARN_ON_ONCE(1); |
881833e3 | 262 | } |
f1676205 MD |
263 | ctx_record(ctx, ltt_chan, event->ctx); |
264 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); | |
881833e3 MD |
265 | } |
266 | ||
7514523f MD |
267 | static const struct lib_ring_buffer_config client_config; |
268 | ||
269 | static u64 client_ring_buffer_clock_read(struct channel *chan) | |
270 | { | |
271 | return lib_ring_buffer_clock_read(chan); | |
272 | } | |
273 | ||
1e2015dc | 274 | static |
7514523f MD |
275 | size_t client_record_header_size(const struct lib_ring_buffer_config *config, |
276 | struct channel *chan, size_t offset, | |
7514523f | 277 | size_t *pre_header_padding, |
7514523f MD |
278 | struct lib_ring_buffer_ctx *ctx) |
279 | { | |
64c796d8 MD |
280 | return record_header_size(config, chan, offset, |
281 | pre_header_padding, ctx); | |
7514523f MD |
282 | } |
283 | ||
284 | /** | |
1c25284c | 285 | * client_packet_header_size - called on buffer-switch to a new sub-buffer |
7514523f MD |
286 | * |
287 | * Return header size without padding after the structure. Don't use packed | |
288 | * structure because gcc generates inefficient code on some architectures | |
289 | * (powerpc, mips..) | |
290 | */ | |
1c25284c | 291 | static size_t client_packet_header_size(void) |
7514523f | 292 | { |
9115fbdc | 293 | return offsetof(struct packet_header, ctx.header_end); |
7514523f MD |
294 | } |
295 | ||
296 | static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc, | |
297 | unsigned int subbuf_idx) | |
298 | { | |
299 | struct channel *chan = buf->backend.chan; | |
1c25284c MD |
300 | struct packet_header *header = |
301 | (struct packet_header *) | |
7514523f MD |
302 | lib_ring_buffer_offset_address(&buf->backend, |
303 | subbuf_idx * chan->backend.subbuf_size); | |
9115fbdc MD |
304 | struct ltt_channel *ltt_chan = channel_get_private(chan); |
305 | struct ltt_session *session = ltt_chan->session; | |
7514523f | 306 | |
d793d5e1 | 307 | header->magic = CTF_MAGIC_NUMBER; |
1ec3f75a | 308 | memcpy(header->uuid, session->uuid.b, sizeof(session->uuid)); |
9115fbdc MD |
309 | header->stream_id = ltt_chan->id; |
310 | header->ctx.timestamp_begin = tsc; | |
311 | header->ctx.timestamp_end = 0; | |
312 | header->ctx.events_discarded = 0; | |
313 | header->ctx.content_size = 0xFFFFFFFF; /* for debugging */ | |
314 | header->ctx.packet_size = 0xFFFFFFFF; | |
315 | header->ctx.cpu_id = buf->backend.cpu; | |
7514523f MD |
316 | } |
317 | ||
318 | /* | |
319 | * offset is assumed to never be 0 here : never deliver a completely empty | |
320 | * subbuffer. data_size is between 1 and subbuf_size. | |
321 | */ | |
322 | static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc, | |
323 | unsigned int subbuf_idx, unsigned long data_size) | |
324 | { | |
325 | struct channel *chan = buf->backend.chan; | |
1c25284c MD |
326 | struct packet_header *header = |
327 | (struct packet_header *) | |
7514523f MD |
328 | lib_ring_buffer_offset_address(&buf->backend, |
329 | subbuf_idx * chan->backend.subbuf_size); | |
330 | unsigned long records_lost = 0; | |
331 | ||
9115fbdc | 332 | header->ctx.timestamp_end = tsc; |
05d32c64 MD |
333 | header->ctx.content_size = data_size * CHAR_BIT; /* in bits */ |
334 | header->ctx.packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
7514523f MD |
335 | records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf); |
336 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); | |
337 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
9115fbdc | 338 | header->ctx.events_discarded = records_lost; |
7514523f MD |
339 | } |
340 | ||
341 | static int client_buffer_create(struct lib_ring_buffer *buf, void *priv, | |
342 | int cpu, const char *name) | |
343 | { | |
1c25284c | 344 | return 0; |
7514523f MD |
345 | } |
346 | ||
347 | static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int cpu) | |
348 | { | |
7514523f MD |
349 | } |
350 | ||
351 | static const struct lib_ring_buffer_config client_config = { | |
352 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, | |
353 | .cb.record_header_size = client_record_header_size, | |
1c25284c | 354 | .cb.subbuffer_header_size = client_packet_header_size, |
7514523f MD |
355 | .cb.buffer_begin = client_buffer_begin, |
356 | .cb.buffer_end = client_buffer_end, | |
357 | .cb.buffer_create = client_buffer_create, | |
358 | .cb.buffer_finalize = client_buffer_finalize, | |
359 | ||
360 | .tsc_bits = 32, | |
361 | .alloc = RING_BUFFER_ALLOC_PER_CPU, | |
362 | .sync = RING_BUFFER_SYNC_PER_CPU, | |
3d084699 | 363 | .mode = RING_BUFFER_MODE_TEMPLATE, |
7514523f | 364 | .backend = RING_BUFFER_PAGE, |
2db1399a | 365 | .output = RING_BUFFER_OUTPUT_TEMPLATE, |
7514523f MD |
366 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
367 | .ipi = RING_BUFFER_IPI_BARRIER, | |
368 | .wakeup = RING_BUFFER_WAKEUP_BY_TIMER, | |
369 | }; | |
370 | ||
1e2015dc | 371 | static |
1c25284c | 372 | struct channel *_channel_create(const char *name, |
9115fbdc | 373 | struct ltt_channel *ltt_chan, void *buf_addr, |
1c25284c MD |
374 | size_t subbuf_size, size_t num_subbuf, |
375 | unsigned int switch_timer_interval, | |
376 | unsigned int read_timer_interval) | |
7514523f | 377 | { |
9115fbdc | 378 | return channel_create(&client_config, name, ltt_chan, buf_addr, |
7514523f MD |
379 | subbuf_size, num_subbuf, switch_timer_interval, |
380 | read_timer_interval); | |
7514523f MD |
381 | } |
382 | ||
1e2015dc | 383 | static |
7514523f MD |
384 | void ltt_channel_destroy(struct channel *chan) |
385 | { | |
7514523f | 386 | channel_destroy(chan); |
7514523f MD |
387 | } |
388 | ||
ad1c05e1 MD |
389 | static |
390 | struct lib_ring_buffer *ltt_buffer_read_open(struct channel *chan) | |
391 | { | |
392 | struct lib_ring_buffer *buf; | |
393 | int cpu; | |
394 | ||
1c25284c MD |
395 | for_each_channel_cpu(cpu, chan) { |
396 | buf = channel_get_ring_buffer(&client_config, chan, cpu); | |
ad1c05e1 MD |
397 | if (!lib_ring_buffer_open_read(buf)) |
398 | return buf; | |
399 | } | |
400 | return NULL; | |
401 | } | |
402 | ||
f71ecafa MD |
403 | static |
404 | int ltt_buffer_has_read_closed_stream(struct channel *chan) | |
405 | { | |
406 | struct lib_ring_buffer *buf; | |
407 | int cpu; | |
408 | ||
409 | for_each_channel_cpu(cpu, chan) { | |
410 | buf = channel_get_ring_buffer(&client_config, chan, cpu); | |
411 | if (!atomic_long_read(&buf->active_readers)) | |
412 | return 1; | |
413 | } | |
414 | return 0; | |
415 | } | |
416 | ||
ad1c05e1 | 417 | static |
1c25284c | 418 | void ltt_buffer_read_close(struct lib_ring_buffer *buf) |
ad1c05e1 MD |
419 | { |
420 | lib_ring_buffer_release_read(buf); | |
1c25284c MD |
421 | } |
422 | ||
c099397a | 423 | static |
4e1f08f4 | 424 | int ltt_event_reserve(struct lib_ring_buffer_ctx *ctx, |
64c796d8 | 425 | uint32_t event_id) |
1c25284c | 426 | { |
64c796d8 | 427 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
1c25284c MD |
428 | int ret, cpu; |
429 | ||
430 | cpu = lib_ring_buffer_get_cpu(&client_config); | |
431 | if (cpu < 0) | |
432 | return -EPERM; | |
433 | ctx->cpu = cpu; | |
434 | ||
64c796d8 MD |
435 | switch (ltt_chan->header_type) { |
436 | case 1: /* compact */ | |
437 | if (event_id > 30) | |
438 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
439 | break; | |
440 | case 2: /* large */ | |
441 | if (event_id > 65534) | |
442 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
443 | break; | |
444 | default: | |
445 | WARN_ON_ONCE(1); | |
446 | } | |
447 | ||
1c25284c MD |
448 | ret = lib_ring_buffer_reserve(&client_config, ctx); |
449 | if (ret) | |
450 | goto put; | |
4e1f08f4 MD |
451 | ltt_write_event_header(&client_config, ctx, event_id); |
452 | return 0; | |
1c25284c MD |
453 | put: |
454 | lib_ring_buffer_put_cpu(&client_config); | |
455 | return ret; | |
ad1c05e1 MD |
456 | } |
457 | ||
c099397a | 458 | static |
1c25284c MD |
459 | void ltt_event_commit(struct lib_ring_buffer_ctx *ctx) |
460 | { | |
461 | lib_ring_buffer_commit(&client_config, ctx); | |
462 | lib_ring_buffer_put_cpu(&client_config); | |
463 | } | |
464 | ||
c099397a | 465 | static |
e763dbf5 MD |
466 | void ltt_event_write(struct lib_ring_buffer_ctx *ctx, const void *src, |
467 | size_t len) | |
468 | { | |
469 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
470 | } | |
1c25284c | 471 | |
c099397a | 472 | static |
24cedcfe | 473 | wait_queue_head_t *ltt_get_reader_wait_queue(struct channel *chan) |
c099397a | 474 | { |
24cedcfe MD |
475 | return &chan->read_wait; |
476 | } | |
477 | ||
478 | static | |
479 | wait_queue_head_t *ltt_get_hp_wait_queue(struct channel *chan) | |
480 | { | |
481 | return &chan->hp_wait; | |
482 | } | |
483 | ||
484 | static | |
485 | int ltt_is_finalized(struct channel *chan) | |
486 | { | |
487 | return lib_ring_buffer_channel_is_finalized(chan); | |
c099397a MD |
488 | } |
489 | ||
254ec7bc MD |
490 | static |
491 | int ltt_is_disabled(struct channel *chan) | |
492 | { | |
493 | return lib_ring_buffer_channel_is_disabled(chan); | |
494 | } | |
495 | ||
7514523f | 496 | static struct ltt_transport ltt_relay_transport = { |
3d084699 | 497 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING, |
7514523f MD |
498 | .owner = THIS_MODULE, |
499 | .ops = { | |
1c25284c MD |
500 | .channel_create = _channel_create, |
501 | .channel_destroy = ltt_channel_destroy, | |
ad1c05e1 | 502 | .buffer_read_open = ltt_buffer_read_open, |
f71ecafa MD |
503 | .buffer_has_read_closed_stream = |
504 | ltt_buffer_has_read_closed_stream, | |
ad1c05e1 | 505 | .buffer_read_close = ltt_buffer_read_close, |
1c25284c MD |
506 | .event_reserve = ltt_event_reserve, |
507 | .event_commit = ltt_event_commit, | |
e763dbf5 | 508 | .event_write = ltt_event_write, |
1ec3f75a | 509 | .packet_avail_size = NULL, /* Would be racy anyway */ |
c099397a | 510 | .get_reader_wait_queue = ltt_get_reader_wait_queue, |
24cedcfe MD |
511 | .get_hp_wait_queue = ltt_get_hp_wait_queue, |
512 | .is_finalized = ltt_is_finalized, | |
254ec7bc | 513 | .is_disabled = ltt_is_disabled, |
7514523f MD |
514 | }, |
515 | }; | |
516 | ||
3d084699 | 517 | static int __init ltt_ring_buffer_client_init(void) |
7514523f | 518 | { |
a509e133 MD |
519 | /* |
520 | * This vmalloc sync all also takes care of the lib ring buffer | |
521 | * vmalloc'd module pages when it is built as a module into LTTng. | |
522 | */ | |
6d2a620c | 523 | wrapper_vmalloc_sync_all(); |
7514523f MD |
524 | ltt_transport_register(<t_relay_transport); |
525 | return 0; | |
526 | } | |
527 | ||
1c25284c MD |
528 | module_init(ltt_ring_buffer_client_init); |
529 | ||
3d084699 | 530 | static void __exit ltt_ring_buffer_client_exit(void) |
7514523f | 531 | { |
7514523f MD |
532 | ltt_transport_unregister(<t_relay_transport); |
533 | } | |
534 | ||
1c25284c MD |
535 | module_exit(ltt_ring_buffer_client_exit); |
536 | ||
7514523f MD |
537 | MODULE_LICENSE("GPL and additional rights"); |
538 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
3d084699 MD |
539 | MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING |
540 | " client"); |