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