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. | |
fcf74578 MD |
25 | * |
26 | * The guarantee we have with timestamps is that all the events in a | |
27 | * packet are included (inclusive) within the begin/end timestamps of | |
28 | * the packet. Another guarantee we have is that the "timestamp begin", | |
29 | * as well as the event timestamps, are monotonically increasing (never | |
30 | * decrease) when moving forward in a stream (physically). But this | |
31 | * guarantee does not apply to "timestamp end", because it is sampled at | |
32 | * commit time, which is not ordered with respect to space reservation. | |
d793d5e1 | 33 | */ |
9115fbdc | 34 | |
d793d5e1 | 35 | struct packet_header { |
9115fbdc | 36 | /* Trace packet header */ |
d793d5e1 MD |
37 | uint32_t magic; /* |
38 | * Trace magic number. | |
39 | * contains endianness information. | |
40 | */ | |
1ec3f75a | 41 | uint8_t uuid[16]; |
d793d5e1 | 42 | uint32_t stream_id; |
9115fbdc MD |
43 | |
44 | struct { | |
45 | /* Stream packet context */ | |
46 | uint64_t timestamp_begin; /* Cycle count at subbuffer start */ | |
47 | uint64_t timestamp_end; /* Cycle count at subbuffer end */ | |
48 | uint32_t events_discarded; /* | |
49 | * Events lost in this subbuffer since | |
50 | * the beginning of the trace. | |
51 | * (may overflow) | |
52 | */ | |
53 | uint32_t content_size; /* Size of data in subbuffer */ | |
54 | uint32_t packet_size; /* Subbuffer size (include padding) */ | |
55 | uint32_t cpu_id; /* CPU id associated with stream */ | |
56 | uint8_t header_end; /* End of header */ | |
57 | } ctx; | |
d793d5e1 MD |
58 | }; |
59 | ||
60 | ||
881833e3 MD |
61 | static inline notrace u64 lib_ring_buffer_clock_read(struct channel *chan) |
62 | { | |
63 | return trace_clock_read64(); | |
64 | } | |
65 | ||
f1676205 MD |
66 | static inline |
67 | size_t ctx_get_size(size_t offset, struct lttng_ctx *ctx) | |
68 | { | |
69 | int i; | |
70 | size_t orig_offset = offset; | |
71 | ||
72 | if (likely(!ctx)) | |
73 | return 0; | |
74 | for (i = 0; i < ctx->nr_fields; i++) | |
75 | offset += ctx->fields[i].get_size(offset); | |
76 | return offset - orig_offset; | |
77 | } | |
78 | ||
79 | static inline | |
80 | void ctx_record(struct lib_ring_buffer_ctx *bufctx, | |
81 | struct ltt_channel *chan, | |
82 | struct lttng_ctx *ctx) | |
83 | { | |
84 | int i; | |
85 | ||
86 | if (likely(!ctx)) | |
87 | return; | |
88 | for (i = 0; i < ctx->nr_fields; i++) | |
89 | ctx->fields[i].record(&ctx->fields[i], bufctx, chan); | |
90 | } | |
91 | ||
881833e3 MD |
92 | /* |
93 | * record_header_size - Calculate the header size and padding necessary. | |
94 | * @config: ring buffer instance configuration | |
95 | * @chan: channel | |
96 | * @offset: offset in the write buffer | |
881833e3 | 97 | * @pre_header_padding: padding to add before the header (output) |
881833e3 MD |
98 | * @ctx: reservation context |
99 | * | |
100 | * Returns the event header size (including padding). | |
101 | * | |
881833e3 MD |
102 | * The payload must itself determine its own alignment from the biggest type it |
103 | * contains. | |
104 | */ | |
105 | static __inline__ | |
106 | unsigned char record_header_size(const struct lib_ring_buffer_config *config, | |
107 | struct channel *chan, size_t offset, | |
64c796d8 | 108 | size_t *pre_header_padding, |
881833e3 MD |
109 | struct lib_ring_buffer_ctx *ctx) |
110 | { | |
9115fbdc | 111 | struct ltt_channel *ltt_chan = channel_get_private(chan); |
f1676205 | 112 | struct ltt_event *event = ctx->priv; |
881833e3 MD |
113 | size_t orig_offset = offset; |
114 | size_t padding; | |
115 | ||
9115fbdc MD |
116 | switch (ltt_chan->header_type) { |
117 | case 1: /* compact */ | |
118 | padding = lib_ring_buffer_align(offset, ltt_alignof(uint32_t)); | |
119 | offset += padding; | |
64c796d8 | 120 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
121 | offset += sizeof(uint32_t); /* id and timestamp */ |
122 | } else { | |
123 | /* Minimum space taken by 5-bit id */ | |
124 | offset += sizeof(uint8_t); | |
125 | /* Align extended struct on largest member */ | |
126 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
127 | offset += sizeof(uint32_t); /* id */ | |
128 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
129 | offset += sizeof(uint64_t); /* timestamp */ | |
130 | } | |
131 | break; | |
132 | case 2: /* large */ | |
133 | padding = lib_ring_buffer_align(offset, ltt_alignof(uint16_t)); | |
134 | offset += padding; | |
135 | offset += sizeof(uint16_t); | |
64c796d8 | 136 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
137 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint32_t)); |
138 | offset += sizeof(uint32_t); /* timestamp */ | |
139 | } else { | |
140 | /* Align extended struct on largest member */ | |
141 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
142 | offset += sizeof(uint32_t); /* id */ | |
143 | offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); | |
144 | offset += sizeof(uint64_t); /* timestamp */ | |
881833e3 | 145 | } |
9115fbdc MD |
146 | break; |
147 | default: | |
1b2e041f | 148 | padding = 0; |
64c796d8 | 149 | WARN_ON_ONCE(1); |
881833e3 | 150 | } |
f1676205 MD |
151 | offset += ctx_get_size(offset, event->ctx); |
152 | offset += ctx_get_size(offset, ltt_chan->ctx); | |
881833e3 MD |
153 | |
154 | *pre_header_padding = padding; | |
155 | return offset - orig_offset; | |
156 | } | |
157 | ||
158 | #include "wrapper/ringbuffer/api.h" | |
159 | ||
eb9a7857 | 160 | static |
881833e3 MD |
161 | void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, |
162 | struct lib_ring_buffer_ctx *ctx, | |
64c796d8 | 163 | uint32_t event_id); |
881833e3 MD |
164 | |
165 | /* | |
166 | * ltt_write_event_header | |
167 | * | |
168 | * Writes the event header to the offset (already aligned on 32-bits). | |
169 | * | |
170 | * @config: ring buffer instance configuration | |
171 | * @ctx: reservation context | |
4e1f08f4 | 172 | * @event_id: event ID |
881833e3 MD |
173 | */ |
174 | static __inline__ | |
175 | void ltt_write_event_header(const struct lib_ring_buffer_config *config, | |
176 | struct lib_ring_buffer_ctx *ctx, | |
64c796d8 | 177 | uint32_t event_id) |
881833e3 | 178 | { |
9115fbdc | 179 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
f1676205 | 180 | struct ltt_event *event = ctx->priv; |
881833e3 MD |
181 | |
182 | if (unlikely(ctx->rflags)) | |
183 | goto slow_path; | |
184 | ||
9115fbdc MD |
185 | switch (ltt_chan->header_type) { |
186 | case 1: /* compact */ | |
187 | { | |
188 | uint32_t id_time = 0; | |
189 | ||
4e1f08f4 | 190 | bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); |
9115fbdc MD |
191 | bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); |
192 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); | |
193 | break; | |
194 | } | |
195 | case 2: /* large */ | |
196 | { | |
9115fbdc | 197 | uint32_t timestamp = (uint32_t) ctx->tsc; |
7e855749 | 198 | uint16_t id = event_id; |
9115fbdc | 199 | |
7e855749 | 200 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
9115fbdc MD |
201 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); |
202 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
203 | break; | |
204 | } | |
205 | default: | |
64c796d8 | 206 | WARN_ON_ONCE(1); |
9115fbdc | 207 | } |
f1676205 | 208 | |
f1676205 | 209 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); |
da4e2332 | 210 | ctx_record(ctx, ltt_chan, event->ctx); |
f1676205 | 211 | |
9115fbdc | 212 | return; |
881833e3 MD |
213 | |
214 | slow_path: | |
4e1f08f4 | 215 | ltt_write_event_header_slow(config, ctx, event_id); |
881833e3 MD |
216 | } |
217 | ||
eb9a7857 | 218 | static |
881833e3 | 219 | void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, |
64c796d8 MD |
220 | struct lib_ring_buffer_ctx *ctx, |
221 | uint32_t event_id) | |
881833e3 | 222 | { |
9115fbdc | 223 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
f1676205 | 224 | struct ltt_event *event = ctx->priv; |
9115fbdc MD |
225 | |
226 | switch (ltt_chan->header_type) { | |
227 | case 1: /* compact */ | |
64c796d8 | 228 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc MD |
229 | uint32_t id_time = 0; |
230 | ||
4e1f08f4 | 231 | bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); |
9115fbdc MD |
232 | bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); |
233 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); | |
234 | } else { | |
235 | uint8_t id = 0; | |
9115fbdc MD |
236 | uint64_t timestamp = ctx->tsc; |
237 | ||
238 | bt_bitfield_write(&id, uint8_t, 0, 5, 31); | |
239 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
240 | /* Align extended struct on largest member */ | |
241 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
242 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); | |
243 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
244 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
245 | } | |
881833e3 | 246 | break; |
9115fbdc MD |
247 | case 2: /* large */ |
248 | { | |
64c796d8 | 249 | if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { |
9115fbdc | 250 | uint32_t timestamp = (uint32_t) ctx->tsc; |
7e855749 | 251 | uint16_t id = event_id; |
9115fbdc | 252 | |
7e855749 | 253 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
9115fbdc MD |
254 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); |
255 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
256 | } else { | |
64c796d8 | 257 | uint16_t id = 65535; |
9115fbdc MD |
258 | uint64_t timestamp = ctx->tsc; |
259 | ||
64c796d8 | 260 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
9115fbdc MD |
261 | /* Align extended struct on largest member */ |
262 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); | |
64c796d8 | 263 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
9115fbdc MD |
264 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); |
265 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); | |
266 | } | |
881833e3 | 267 | break; |
881833e3 | 268 | } |
9115fbdc | 269 | default: |
64c796d8 | 270 | WARN_ON_ONCE(1); |
881833e3 | 271 | } |
f1676205 | 272 | ctx_record(ctx, ltt_chan, ltt_chan->ctx); |
da4e2332 | 273 | ctx_record(ctx, ltt_chan, event->ctx); |
881833e3 MD |
274 | } |
275 | ||
7514523f MD |
276 | static const struct lib_ring_buffer_config client_config; |
277 | ||
278 | static u64 client_ring_buffer_clock_read(struct channel *chan) | |
279 | { | |
280 | return lib_ring_buffer_clock_read(chan); | |
281 | } | |
282 | ||
1e2015dc | 283 | static |
7514523f MD |
284 | size_t client_record_header_size(const struct lib_ring_buffer_config *config, |
285 | struct channel *chan, size_t offset, | |
7514523f | 286 | size_t *pre_header_padding, |
7514523f MD |
287 | struct lib_ring_buffer_ctx *ctx) |
288 | { | |
64c796d8 MD |
289 | return record_header_size(config, chan, offset, |
290 | pre_header_padding, ctx); | |
7514523f MD |
291 | } |
292 | ||
293 | /** | |
1c25284c | 294 | * client_packet_header_size - called on buffer-switch to a new sub-buffer |
7514523f MD |
295 | * |
296 | * Return header size without padding after the structure. Don't use packed | |
297 | * structure because gcc generates inefficient code on some architectures | |
298 | * (powerpc, mips..) | |
299 | */ | |
1c25284c | 300 | static size_t client_packet_header_size(void) |
7514523f | 301 | { |
9115fbdc | 302 | return offsetof(struct packet_header, ctx.header_end); |
7514523f MD |
303 | } |
304 | ||
305 | static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc, | |
306 | unsigned int subbuf_idx) | |
307 | { | |
308 | struct channel *chan = buf->backend.chan; | |
1c25284c MD |
309 | struct packet_header *header = |
310 | (struct packet_header *) | |
7514523f MD |
311 | lib_ring_buffer_offset_address(&buf->backend, |
312 | subbuf_idx * chan->backend.subbuf_size); | |
9115fbdc MD |
313 | struct ltt_channel *ltt_chan = channel_get_private(chan); |
314 | struct ltt_session *session = ltt_chan->session; | |
7514523f | 315 | |
d793d5e1 | 316 | header->magic = CTF_MAGIC_NUMBER; |
1ec3f75a | 317 | memcpy(header->uuid, session->uuid.b, sizeof(session->uuid)); |
9115fbdc MD |
318 | header->stream_id = ltt_chan->id; |
319 | header->ctx.timestamp_begin = tsc; | |
320 | header->ctx.timestamp_end = 0; | |
321 | header->ctx.events_discarded = 0; | |
322 | header->ctx.content_size = 0xFFFFFFFF; /* for debugging */ | |
323 | header->ctx.packet_size = 0xFFFFFFFF; | |
324 | header->ctx.cpu_id = buf->backend.cpu; | |
7514523f MD |
325 | } |
326 | ||
327 | /* | |
328 | * offset is assumed to never be 0 here : never deliver a completely empty | |
329 | * subbuffer. data_size is between 1 and subbuf_size. | |
330 | */ | |
331 | static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc, | |
332 | unsigned int subbuf_idx, unsigned long data_size) | |
333 | { | |
334 | struct channel *chan = buf->backend.chan; | |
1c25284c MD |
335 | struct packet_header *header = |
336 | (struct packet_header *) | |
7514523f MD |
337 | lib_ring_buffer_offset_address(&buf->backend, |
338 | subbuf_idx * chan->backend.subbuf_size); | |
339 | unsigned long records_lost = 0; | |
340 | ||
9115fbdc | 341 | header->ctx.timestamp_end = tsc; |
05d32c64 MD |
342 | header->ctx.content_size = data_size * CHAR_BIT; /* in bits */ |
343 | header->ctx.packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
7514523f MD |
344 | records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf); |
345 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); | |
346 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
9115fbdc | 347 | header->ctx.events_discarded = records_lost; |
7514523f MD |
348 | } |
349 | ||
350 | static int client_buffer_create(struct lib_ring_buffer *buf, void *priv, | |
351 | int cpu, const char *name) | |
352 | { | |
1c25284c | 353 | return 0; |
7514523f MD |
354 | } |
355 | ||
356 | static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int cpu) | |
357 | { | |
7514523f MD |
358 | } |
359 | ||
360 | static const struct lib_ring_buffer_config client_config = { | |
361 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, | |
362 | .cb.record_header_size = client_record_header_size, | |
1c25284c | 363 | .cb.subbuffer_header_size = client_packet_header_size, |
7514523f MD |
364 | .cb.buffer_begin = client_buffer_begin, |
365 | .cb.buffer_end = client_buffer_end, | |
366 | .cb.buffer_create = client_buffer_create, | |
367 | .cb.buffer_finalize = client_buffer_finalize, | |
368 | ||
369 | .tsc_bits = 32, | |
370 | .alloc = RING_BUFFER_ALLOC_PER_CPU, | |
371 | .sync = RING_BUFFER_SYNC_PER_CPU, | |
3d084699 | 372 | .mode = RING_BUFFER_MODE_TEMPLATE, |
7514523f | 373 | .backend = RING_BUFFER_PAGE, |
2db1399a | 374 | .output = RING_BUFFER_OUTPUT_TEMPLATE, |
7514523f MD |
375 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
376 | .ipi = RING_BUFFER_IPI_BARRIER, | |
377 | .wakeup = RING_BUFFER_WAKEUP_BY_TIMER, | |
378 | }; | |
379 | ||
1e2015dc | 380 | static |
1c25284c | 381 | struct channel *_channel_create(const char *name, |
9115fbdc | 382 | struct ltt_channel *ltt_chan, void *buf_addr, |
1c25284c MD |
383 | size_t subbuf_size, size_t num_subbuf, |
384 | unsigned int switch_timer_interval, | |
385 | unsigned int read_timer_interval) | |
7514523f | 386 | { |
9115fbdc | 387 | return channel_create(&client_config, name, ltt_chan, buf_addr, |
7514523f MD |
388 | subbuf_size, num_subbuf, switch_timer_interval, |
389 | read_timer_interval); | |
7514523f MD |
390 | } |
391 | ||
1e2015dc | 392 | static |
7514523f MD |
393 | void ltt_channel_destroy(struct channel *chan) |
394 | { | |
7514523f | 395 | channel_destroy(chan); |
7514523f MD |
396 | } |
397 | ||
ad1c05e1 MD |
398 | static |
399 | struct lib_ring_buffer *ltt_buffer_read_open(struct channel *chan) | |
400 | { | |
401 | struct lib_ring_buffer *buf; | |
402 | int cpu; | |
403 | ||
1c25284c MD |
404 | for_each_channel_cpu(cpu, chan) { |
405 | buf = channel_get_ring_buffer(&client_config, chan, cpu); | |
ad1c05e1 MD |
406 | if (!lib_ring_buffer_open_read(buf)) |
407 | return buf; | |
408 | } | |
409 | return NULL; | |
410 | } | |
411 | ||
f71ecafa MD |
412 | static |
413 | int ltt_buffer_has_read_closed_stream(struct channel *chan) | |
414 | { | |
415 | struct lib_ring_buffer *buf; | |
416 | int cpu; | |
417 | ||
418 | for_each_channel_cpu(cpu, chan) { | |
419 | buf = channel_get_ring_buffer(&client_config, chan, cpu); | |
420 | if (!atomic_long_read(&buf->active_readers)) | |
421 | return 1; | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
ad1c05e1 | 426 | static |
1c25284c | 427 | void ltt_buffer_read_close(struct lib_ring_buffer *buf) |
ad1c05e1 MD |
428 | { |
429 | lib_ring_buffer_release_read(buf); | |
1c25284c MD |
430 | } |
431 | ||
c099397a | 432 | static |
4e1f08f4 | 433 | int ltt_event_reserve(struct lib_ring_buffer_ctx *ctx, |
64c796d8 | 434 | uint32_t event_id) |
1c25284c | 435 | { |
64c796d8 | 436 | struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); |
1c25284c MD |
437 | int ret, cpu; |
438 | ||
439 | cpu = lib_ring_buffer_get_cpu(&client_config); | |
440 | if (cpu < 0) | |
441 | return -EPERM; | |
442 | ctx->cpu = cpu; | |
443 | ||
64c796d8 MD |
444 | switch (ltt_chan->header_type) { |
445 | case 1: /* compact */ | |
446 | if (event_id > 30) | |
447 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
448 | break; | |
449 | case 2: /* large */ | |
450 | if (event_id > 65534) | |
451 | ctx->rflags |= LTT_RFLAG_EXTENDED; | |
452 | break; | |
453 | default: | |
454 | WARN_ON_ONCE(1); | |
455 | } | |
456 | ||
1c25284c MD |
457 | ret = lib_ring_buffer_reserve(&client_config, ctx); |
458 | if (ret) | |
459 | goto put; | |
4e1f08f4 MD |
460 | ltt_write_event_header(&client_config, ctx, event_id); |
461 | return 0; | |
1c25284c MD |
462 | put: |
463 | lib_ring_buffer_put_cpu(&client_config); | |
464 | return ret; | |
ad1c05e1 MD |
465 | } |
466 | ||
c099397a | 467 | static |
1c25284c MD |
468 | void ltt_event_commit(struct lib_ring_buffer_ctx *ctx) |
469 | { | |
470 | lib_ring_buffer_commit(&client_config, ctx); | |
471 | lib_ring_buffer_put_cpu(&client_config); | |
472 | } | |
473 | ||
c099397a | 474 | static |
e763dbf5 MD |
475 | void ltt_event_write(struct lib_ring_buffer_ctx *ctx, const void *src, |
476 | size_t len) | |
477 | { | |
478 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
479 | } | |
1c25284c | 480 | |
c099397a | 481 | static |
71c1d843 | 482 | wait_queue_head_t *ltt_get_writer_buf_wait_queue(struct channel *chan, int cpu) |
c099397a | 483 | { |
71c1d843 MD |
484 | struct lib_ring_buffer *buf = channel_get_ring_buffer(&client_config, |
485 | chan, cpu); | |
486 | return &buf->write_wait; | |
24cedcfe MD |
487 | } |
488 | ||
489 | static | |
490 | wait_queue_head_t *ltt_get_hp_wait_queue(struct channel *chan) | |
491 | { | |
492 | return &chan->hp_wait; | |
493 | } | |
494 | ||
495 | static | |
496 | int ltt_is_finalized(struct channel *chan) | |
497 | { | |
498 | return lib_ring_buffer_channel_is_finalized(chan); | |
c099397a MD |
499 | } |
500 | ||
254ec7bc MD |
501 | static |
502 | int ltt_is_disabled(struct channel *chan) | |
503 | { | |
504 | return lib_ring_buffer_channel_is_disabled(chan); | |
505 | } | |
506 | ||
7514523f | 507 | static struct ltt_transport ltt_relay_transport = { |
3d084699 | 508 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING, |
7514523f MD |
509 | .owner = THIS_MODULE, |
510 | .ops = { | |
1c25284c MD |
511 | .channel_create = _channel_create, |
512 | .channel_destroy = ltt_channel_destroy, | |
ad1c05e1 | 513 | .buffer_read_open = ltt_buffer_read_open, |
f71ecafa MD |
514 | .buffer_has_read_closed_stream = |
515 | ltt_buffer_has_read_closed_stream, | |
ad1c05e1 | 516 | .buffer_read_close = ltt_buffer_read_close, |
1c25284c MD |
517 | .event_reserve = ltt_event_reserve, |
518 | .event_commit = ltt_event_commit, | |
e763dbf5 | 519 | .event_write = ltt_event_write, |
1ec3f75a | 520 | .packet_avail_size = NULL, /* Would be racy anyway */ |
71c1d843 | 521 | .get_writer_buf_wait_queue = ltt_get_writer_buf_wait_queue, |
24cedcfe MD |
522 | .get_hp_wait_queue = ltt_get_hp_wait_queue, |
523 | .is_finalized = ltt_is_finalized, | |
254ec7bc | 524 | .is_disabled = ltt_is_disabled, |
7514523f MD |
525 | }, |
526 | }; | |
527 | ||
3d084699 | 528 | static int __init ltt_ring_buffer_client_init(void) |
7514523f | 529 | { |
a509e133 MD |
530 | /* |
531 | * This vmalloc sync all also takes care of the lib ring buffer | |
532 | * vmalloc'd module pages when it is built as a module into LTTng. | |
533 | */ | |
6d2a620c | 534 | wrapper_vmalloc_sync_all(); |
7514523f MD |
535 | ltt_transport_register(<t_relay_transport); |
536 | return 0; | |
537 | } | |
538 | ||
1c25284c MD |
539 | module_init(ltt_ring_buffer_client_init); |
540 | ||
3d084699 | 541 | static void __exit ltt_ring_buffer_client_exit(void) |
7514523f | 542 | { |
7514523f MD |
543 | ltt_transport_unregister(<t_relay_transport); |
544 | } | |
545 | ||
1c25284c MD |
546 | module_exit(ltt_ring_buffer_client_exit); |
547 | ||
7514523f MD |
548 | MODULE_LICENSE("GPL and additional rights"); |
549 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
3d084699 MD |
550 | MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING |
551 | " client"); |