Commit | Line | Data |
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881833e3 | 1 | /* |
a90917c3 | 2 | * lttng-ring-buffer-client.h |
881833e3 | 3 | * |
881833e3 MD |
4 | * LTTng lib ring buffer client template. |
5 | * | |
886d51a3 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 | |
881833e3 MD |
21 | */ |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/types.h> | |
25 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ | |
a90917c3 MD |
26 | #include "lttng-events.h" |
27 | #include "lttng-tracer.h" | |
881833e3 | 28 | |
dd5a0db3 MD |
29 | static struct lttng_transport lttng_relay_transport; |
30 | ||
881833e3 MD |
31 | struct metadata_packet_header { |
32 | uint32_t magic; /* 0x75D11D57 */ | |
1ec3f75a | 33 | uint8_t uuid[16]; /* Unique Universal Identifier */ |
881833e3 MD |
34 | uint32_t checksum; /* 0 if unused */ |
35 | uint32_t content_size; /* in bits */ | |
36 | uint32_t packet_size; /* in bits */ | |
37 | uint8_t compression_scheme; /* 0 if unused */ | |
38 | uint8_t encryption_scheme; /* 0 if unused */ | |
39 | uint8_t checksum_scheme; /* 0 if unused */ | |
4173df96 MD |
40 | uint8_t major; /* CTF spec major version number */ |
41 | uint8_t minor; /* CTF spec minor version number */ | |
881833e3 MD |
42 | uint8_t header_end[0]; |
43 | }; | |
44 | ||
45 | struct metadata_record_header { | |
46 | uint8_t header_end[0]; /* End of header */ | |
47 | }; | |
48 | ||
49 | static const struct lib_ring_buffer_config client_config; | |
50 | ||
51 | static inline | |
52 | u64 lib_ring_buffer_clock_read(struct channel *chan) | |
53 | { | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static inline | |
58 | unsigned char record_header_size(const struct lib_ring_buffer_config *config, | |
59 | struct channel *chan, size_t offset, | |
64c796d8 | 60 | size_t *pre_header_padding, |
881833e3 MD |
61 | struct lib_ring_buffer_ctx *ctx) |
62 | { | |
63 | return 0; | |
64 | } | |
65 | ||
66 | #include "wrapper/ringbuffer/api.h" | |
67 | ||
68 | static u64 client_ring_buffer_clock_read(struct channel *chan) | |
69 | { | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static | |
74 | size_t client_record_header_size(const struct lib_ring_buffer_config *config, | |
75 | struct channel *chan, size_t offset, | |
881833e3 | 76 | size_t *pre_header_padding, |
881833e3 MD |
77 | struct lib_ring_buffer_ctx *ctx) |
78 | { | |
79 | return 0; | |
80 | } | |
81 | ||
82 | /** | |
83 | * client_packet_header_size - called on buffer-switch to a new sub-buffer | |
84 | * | |
85 | * Return header size without padding after the structure. Don't use packed | |
86 | * structure because gcc generates inefficient code on some architectures | |
87 | * (powerpc, mips..) | |
88 | */ | |
89 | static size_t client_packet_header_size(void) | |
90 | { | |
91 | return offsetof(struct metadata_packet_header, header_end); | |
92 | } | |
93 | ||
94 | static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc, | |
95 | unsigned int subbuf_idx) | |
96 | { | |
97 | struct channel *chan = buf->backend.chan; | |
98 | struct metadata_packet_header *header = | |
99 | (struct metadata_packet_header *) | |
100 | lib_ring_buffer_offset_address(&buf->backend, | |
101 | subbuf_idx * chan->backend.subbuf_size); | |
a36580d5 MD |
102 | struct lttng_metadata_cache *metadata_cache = |
103 | channel_get_private(chan); | |
881833e3 MD |
104 | |
105 | header->magic = TSDL_MAGIC_NUMBER; | |
a36580d5 MD |
106 | memcpy(header->uuid, metadata_cache->uuid.b, |
107 | sizeof(metadata_cache->uuid)); | |
881833e3 MD |
108 | header->checksum = 0; /* 0 if unused */ |
109 | header->content_size = 0xFFFFFFFF; /* in bits, for debugging */ | |
110 | header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */ | |
111 | header->compression_scheme = 0; /* 0 if unused */ | |
112 | header->encryption_scheme = 0; /* 0 if unused */ | |
113 | header->checksum_scheme = 0; /* 0 if unused */ | |
4173df96 MD |
114 | header->major = CTF_SPEC_MAJOR; |
115 | header->minor = CTF_SPEC_MINOR; | |
881833e3 MD |
116 | } |
117 | ||
118 | /* | |
119 | * offset is assumed to never be 0 here : never deliver a completely empty | |
120 | * subbuffer. data_size is between 1 and subbuf_size. | |
121 | */ | |
122 | static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc, | |
123 | unsigned int subbuf_idx, unsigned long data_size) | |
124 | { | |
125 | struct channel *chan = buf->backend.chan; | |
d793d5e1 | 126 | struct metadata_packet_header *header = |
1ec3f75a | 127 | (struct metadata_packet_header *) |
881833e3 MD |
128 | lib_ring_buffer_offset_address(&buf->backend, |
129 | subbuf_idx * chan->backend.subbuf_size); | |
130 | unsigned long records_lost = 0; | |
131 | ||
132 | header->content_size = data_size * CHAR_BIT; /* in bits */ | |
133 | header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
71c1d843 MD |
134 | /* |
135 | * We do not care about the records lost count, because the metadata | |
136 | * channel waits and retry. | |
137 | */ | |
138 | (void) lib_ring_buffer_get_records_lost_full(&client_config, buf); | |
881833e3 MD |
139 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); |
140 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
141 | WARN_ON_ONCE(records_lost != 0); | |
142 | } | |
143 | ||
144 | static int client_buffer_create(struct lib_ring_buffer *buf, void *priv, | |
145 | int cpu, const char *name) | |
146 | { | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int cpu) | |
151 | { | |
152 | } | |
153 | ||
3b731ab1 JD |
154 | static int client_timestamp_begin(const struct lib_ring_buffer_config *config, |
155 | struct lib_ring_buffer *buf, uint64_t *timestamp_begin) | |
156 | { | |
157 | return -ENOSYS; | |
158 | } | |
159 | ||
160 | static int client_timestamp_end(const struct lib_ring_buffer_config *config, | |
161 | struct lib_ring_buffer *bufb, | |
162 | uint64_t *timestamp_end) | |
163 | { | |
164 | return -ENOSYS; | |
165 | } | |
166 | ||
167 | static int client_events_discarded(const struct lib_ring_buffer_config *config, | |
168 | struct lib_ring_buffer *bufb, | |
169 | uint64_t *events_discarded) | |
170 | { | |
171 | return -ENOSYS; | |
172 | } | |
173 | ||
2348ca17 JD |
174 | static int client_current_timestamp(const struct lib_ring_buffer_config *config, |
175 | struct lib_ring_buffer *bufb, | |
176 | uint64_t *ts) | |
177 | { | |
178 | return -ENOSYS; | |
179 | } | |
180 | ||
3b731ab1 JD |
181 | static int client_content_size(const struct lib_ring_buffer_config *config, |
182 | struct lib_ring_buffer *bufb, | |
183 | uint64_t *content_size) | |
184 | { | |
185 | return -ENOSYS; | |
186 | } | |
187 | ||
188 | static int client_packet_size(const struct lib_ring_buffer_config *config, | |
189 | struct lib_ring_buffer *bufb, | |
190 | uint64_t *packet_size) | |
191 | { | |
192 | return -ENOSYS; | |
193 | } | |
194 | ||
195 | static int client_stream_id(const struct lib_ring_buffer_config *config, | |
196 | struct lib_ring_buffer *bufb, | |
197 | uint64_t *stream_id) | |
198 | { | |
199 | return -ENOSYS; | |
200 | } | |
201 | ||
5b3cf4f9 JD |
202 | static int client_sequence_number(const struct lib_ring_buffer_config *config, |
203 | struct lib_ring_buffer *bufb, | |
204 | uint64_t *seq) | |
205 | { | |
206 | return -ENOSYS; | |
207 | } | |
208 | ||
881833e3 MD |
209 | static const struct lib_ring_buffer_config client_config = { |
210 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, | |
211 | .cb.record_header_size = client_record_header_size, | |
212 | .cb.subbuffer_header_size = client_packet_header_size, | |
213 | .cb.buffer_begin = client_buffer_begin, | |
214 | .cb.buffer_end = client_buffer_end, | |
215 | .cb.buffer_create = client_buffer_create, | |
216 | .cb.buffer_finalize = client_buffer_finalize, | |
217 | ||
218 | .tsc_bits = 0, | |
219 | .alloc = RING_BUFFER_ALLOC_GLOBAL, | |
220 | .sync = RING_BUFFER_SYNC_GLOBAL, | |
221 | .mode = RING_BUFFER_MODE_TEMPLATE, | |
222 | .backend = RING_BUFFER_PAGE, | |
2db1399a | 223 | .output = RING_BUFFER_OUTPUT_TEMPLATE, |
881833e3 MD |
224 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
225 | .ipi = RING_BUFFER_IPI_BARRIER, | |
226 | .wakeup = RING_BUFFER_WAKEUP_BY_TIMER, | |
227 | }; | |
228 | ||
dd5a0db3 MD |
229 | static |
230 | void release_priv_ops(void *priv_ops) | |
231 | { | |
232 | module_put(THIS_MODULE); | |
233 | } | |
234 | ||
235 | static | |
236 | void lttng_channel_destroy(struct channel *chan) | |
237 | { | |
238 | channel_destroy(chan); | |
239 | } | |
240 | ||
881833e3 MD |
241 | static |
242 | struct channel *_channel_create(const char *name, | |
a90917c3 | 243 | struct lttng_channel *lttng_chan, void *buf_addr, |
881833e3 MD |
244 | size_t subbuf_size, size_t num_subbuf, |
245 | unsigned int switch_timer_interval, | |
246 | unsigned int read_timer_interval) | |
247 | { | |
dd5a0db3 MD |
248 | struct channel *chan; |
249 | ||
a36580d5 MD |
250 | chan = channel_create(&client_config, name, |
251 | lttng_chan->session->metadata_cache, buf_addr, | |
881833e3 MD |
252 | subbuf_size, num_subbuf, switch_timer_interval, |
253 | read_timer_interval); | |
dd5a0db3 MD |
254 | if (chan) { |
255 | /* | |
256 | * Ensure this module is not unloaded before we finish | |
257 | * using lttng_relay_transport.ops. | |
258 | */ | |
259 | if (!try_module_get(THIS_MODULE)) { | |
260 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
261 | goto error; | |
262 | } | |
263 | chan->backend.priv_ops = <tng_relay_transport.ops; | |
264 | chan->backend.release_priv_ops = release_priv_ops; | |
265 | } | |
266 | return chan; | |
881833e3 | 267 | |
dd5a0db3 MD |
268 | error: |
269 | lttng_channel_destroy(chan); | |
270 | return NULL; | |
881833e3 MD |
271 | } |
272 | ||
273 | static | |
a90917c3 | 274 | struct lib_ring_buffer *lttng_buffer_read_open(struct channel *chan) |
881833e3 MD |
275 | { |
276 | struct lib_ring_buffer *buf; | |
881833e3 | 277 | |
cd4bd11f MD |
278 | buf = channel_get_ring_buffer(&client_config, chan, 0); |
279 | if (!lib_ring_buffer_open_read(buf)) | |
280 | return buf; | |
881833e3 MD |
281 | return NULL; |
282 | } | |
283 | ||
f71ecafa | 284 | static |
a90917c3 | 285 | int lttng_buffer_has_read_closed_stream(struct channel *chan) |
f71ecafa MD |
286 | { |
287 | struct lib_ring_buffer *buf; | |
288 | int cpu; | |
289 | ||
290 | for_each_channel_cpu(cpu, chan) { | |
291 | buf = channel_get_ring_buffer(&client_config, chan, cpu); | |
292 | if (!atomic_long_read(&buf->active_readers)) | |
293 | return 1; | |
294 | } | |
295 | return 0; | |
296 | } | |
297 | ||
881833e3 | 298 | static |
a90917c3 | 299 | void lttng_buffer_read_close(struct lib_ring_buffer *buf) |
881833e3 MD |
300 | { |
301 | lib_ring_buffer_release_read(buf); | |
881833e3 MD |
302 | } |
303 | ||
c099397a | 304 | static |
a90917c3 | 305 | int lttng_event_reserve(struct lib_ring_buffer_ctx *ctx, uint32_t event_id) |
881833e3 MD |
306 | { |
307 | return lib_ring_buffer_reserve(&client_config, ctx); | |
308 | } | |
309 | ||
c099397a | 310 | static |
a90917c3 | 311 | void lttng_event_commit(struct lib_ring_buffer_ctx *ctx) |
881833e3 MD |
312 | { |
313 | lib_ring_buffer_commit(&client_config, ctx); | |
314 | } | |
315 | ||
c099397a | 316 | static |
a90917c3 | 317 | void lttng_event_write(struct lib_ring_buffer_ctx *ctx, const void *src, |
881833e3 MD |
318 | size_t len) |
319 | { | |
320 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
321 | } | |
322 | ||
4ea00e4f | 323 | static |
a90917c3 | 324 | void lttng_event_write_from_user(struct lib_ring_buffer_ctx *ctx, |
4ea00e4f JD |
325 | const void __user *src, size_t len) |
326 | { | |
7b8ea3a5 | 327 | lib_ring_buffer_copy_from_user_inatomic(&client_config, ctx, src, len); |
4ea00e4f JD |
328 | } |
329 | ||
58aa5d24 | 330 | static |
a90917c3 | 331 | void lttng_event_memset(struct lib_ring_buffer_ctx *ctx, |
58aa5d24 MD |
332 | int c, size_t len) |
333 | { | |
334 | lib_ring_buffer_memset(&client_config, ctx, c, len); | |
335 | } | |
336 | ||
16f78f3a MD |
337 | static |
338 | void lttng_event_strcpy(struct lib_ring_buffer_ctx *ctx, const char *src, | |
339 | size_t len) | |
340 | { | |
341 | lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#'); | |
342 | } | |
343 | ||
1ec3f75a | 344 | static |
a90917c3 | 345 | size_t lttng_packet_avail_size(struct channel *chan) |
1ec3f75a MD |
346 | |
347 | { | |
348 | unsigned long o_begin; | |
349 | struct lib_ring_buffer *buf; | |
350 | ||
351 | buf = chan->backend.buf; /* Only for global buffer ! */ | |
352 | o_begin = v_read(&client_config, &buf->offset); | |
353 | if (subbuf_offset(o_begin, chan) != 0) { | |
354 | return chan->backend.subbuf_size - subbuf_offset(o_begin, chan); | |
355 | } else { | |
356 | return chan->backend.subbuf_size - subbuf_offset(o_begin, chan) | |
357 | - sizeof(struct metadata_packet_header); | |
358 | } | |
359 | } | |
360 | ||
c099397a | 361 | static |
a90917c3 | 362 | wait_queue_head_t *lttng_get_writer_buf_wait_queue(struct channel *chan, int cpu) |
c099397a | 363 | { |
71c1d843 MD |
364 | struct lib_ring_buffer *buf = channel_get_ring_buffer(&client_config, |
365 | chan, cpu); | |
366 | return &buf->write_wait; | |
24cedcfe MD |
367 | } |
368 | ||
369 | static | |
a90917c3 | 370 | wait_queue_head_t *lttng_get_hp_wait_queue(struct channel *chan) |
24cedcfe MD |
371 | { |
372 | return &chan->hp_wait; | |
373 | } | |
374 | ||
375 | static | |
a90917c3 | 376 | int lttng_is_finalized(struct channel *chan) |
24cedcfe MD |
377 | { |
378 | return lib_ring_buffer_channel_is_finalized(chan); | |
c099397a MD |
379 | } |
380 | ||
254ec7bc | 381 | static |
a90917c3 | 382 | int lttng_is_disabled(struct channel *chan) |
254ec7bc MD |
383 | { |
384 | return lib_ring_buffer_channel_is_disabled(chan); | |
385 | } | |
386 | ||
a90917c3 | 387 | static struct lttng_transport lttng_relay_transport = { |
881833e3 MD |
388 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING, |
389 | .owner = THIS_MODULE, | |
390 | .ops = { | |
391 | .channel_create = _channel_create, | |
a90917c3 MD |
392 | .channel_destroy = lttng_channel_destroy, |
393 | .buffer_read_open = lttng_buffer_read_open, | |
f71ecafa | 394 | .buffer_has_read_closed_stream = |
a90917c3 MD |
395 | lttng_buffer_has_read_closed_stream, |
396 | .buffer_read_close = lttng_buffer_read_close, | |
397 | .event_reserve = lttng_event_reserve, | |
398 | .event_commit = lttng_event_commit, | |
399 | .event_write_from_user = lttng_event_write_from_user, | |
400 | .event_memset = lttng_event_memset, | |
401 | .event_write = lttng_event_write, | |
16f78f3a | 402 | .event_strcpy = lttng_event_strcpy, |
a90917c3 MD |
403 | .packet_avail_size = lttng_packet_avail_size, |
404 | .get_writer_buf_wait_queue = lttng_get_writer_buf_wait_queue, | |
405 | .get_hp_wait_queue = lttng_get_hp_wait_queue, | |
406 | .is_finalized = lttng_is_finalized, | |
407 | .is_disabled = lttng_is_disabled, | |
67a80835 MD |
408 | .timestamp_begin = client_timestamp_begin, |
409 | .timestamp_end = client_timestamp_end, | |
410 | .events_discarded = client_events_discarded, | |
411 | .content_size = client_content_size, | |
412 | .packet_size = client_packet_size, | |
413 | .stream_id = client_stream_id, | |
414 | .current_timestamp = client_current_timestamp, | |
5b3cf4f9 | 415 | .sequence_number = client_sequence_number, |
881833e3 MD |
416 | }, |
417 | }; | |
418 | ||
a90917c3 | 419 | static int __init lttng_ring_buffer_client_init(void) |
881833e3 MD |
420 | { |
421 | /* | |
422 | * This vmalloc sync all also takes care of the lib ring buffer | |
423 | * vmalloc'd module pages when it is built as a module into LTTng. | |
424 | */ | |
425 | wrapper_vmalloc_sync_all(); | |
a90917c3 | 426 | lttng_transport_register(<tng_relay_transport); |
881833e3 MD |
427 | return 0; |
428 | } | |
429 | ||
a90917c3 | 430 | module_init(lttng_ring_buffer_client_init); |
881833e3 | 431 | |
a90917c3 | 432 | static void __exit lttng_ring_buffer_client_exit(void) |
881833e3 | 433 | { |
a90917c3 | 434 | lttng_transport_unregister(<tng_relay_transport); |
881833e3 MD |
435 | } |
436 | ||
a90917c3 | 437 | module_exit(lttng_ring_buffer_client_exit); |
881833e3 MD |
438 | |
439 | MODULE_LICENSE("GPL and additional rights"); | |
440 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
441 | MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING | |
442 | " client"); |