Commit | Line | Data |
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3d1fc7fd | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
3d1fc7fd | 3 | * |
e92f3e28 MD |
4 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
5 | * | |
c0c0989a | 6 | * LTTng lib ring buffer client template. |
3d1fc7fd MD |
7 | */ |
8 | ||
9af5d97a | 9 | #include <limits.h> |
b4051ad8 | 10 | #include <stddef.h> |
9f3fdbc6 | 11 | #include <stdint.h> |
7753d283 MJ |
12 | |
13 | #include <ust-events-internal.h> | |
0950190a | 14 | #include <lttng/urcu/pointer.h> |
ae4b659d | 15 | #include "ust-bitfield.h" |
cd61d9bf | 16 | #include "ust-compat.h" |
b728d87e | 17 | #include "clock.h" |
cbbc1cda | 18 | #include "context-internal.h" |
7dd08bec | 19 | #include "lttng-tracer.h" |
9f3fdbc6 | 20 | #include "../libringbuffer/frontend_types.h" |
8936b6c0 | 21 | #include <urcu/tls-compat.h> |
3d1fc7fd | 22 | |
79dfbf42 MD |
23 | #define LTTNG_COMPACT_EVENT_BITS 5 |
24 | #define LTTNG_COMPACT_TSC_BITS 27 | |
25 | ||
ce7352a2 MD |
26 | enum app_ctx_mode { |
27 | APP_CTX_DISABLED, | |
28 | APP_CTX_ENABLED, | |
29 | }; | |
30 | ||
3d1fc7fd MD |
31 | /* |
32 | * Keep the natural field alignment for _each field_ within this structure if | |
33 | * you ever add/remove a field from this header. Packed attribute is not used | |
34 | * because gcc generates poor code on at least powerpc and mips. Don't ever | |
35 | * let gcc add padding between the structure elements. | |
36 | */ | |
37 | ||
38 | struct packet_header { | |
39 | /* Trace packet header */ | |
40 | uint32_t magic; /* | |
41 | * Trace magic number. | |
42 | * contains endianness information. | |
43 | */ | |
19d8b1b3 | 44 | uint8_t uuid[LTTNG_UST_UUID_LEN]; |
3d1fc7fd | 45 | uint32_t stream_id; |
2d94adc5 | 46 | uint64_t stream_instance_id; |
3d1fc7fd MD |
47 | |
48 | struct { | |
49 | /* Stream packet context */ | |
50 | uint64_t timestamp_begin; /* Cycle count at subbuffer start */ | |
51 | uint64_t timestamp_end; /* Cycle count at subbuffer end */ | |
0c00a107 MD |
52 | uint64_t content_size; /* Size of data in subbuffer */ |
53 | uint64_t packet_size; /* Subbuffer size (include padding) */ | |
1ff31389 | 54 | uint64_t packet_seq_num; /* Packet sequence number */ |
18fc8d71 | 55 | unsigned long events_discarded; /* |
3d1fc7fd MD |
56 | * Events lost in this subbuffer since |
57 | * the beginning of the trace. | |
58 | * (may overflow) | |
59 | */ | |
3d1fc7fd MD |
60 | uint32_t cpu_id; /* CPU id associated with stream */ |
61 | uint8_t header_end; /* End of header */ | |
62 | } ctx; | |
63 | }; | |
64 | ||
e56bb47c MD |
65 | struct lttng_client_ctx { |
66 | size_t packet_context_len; | |
67 | size_t event_context_len; | |
0950190a | 68 | struct lttng_ust_ctx *chan_ctx; |
a40b5b8c | 69 | struct lttng_ust_ctx *event_ctx; |
e56bb47c | 70 | }; |
3d1fc7fd | 71 | |
8936b6c0 MD |
72 | /* |
73 | * Indexed by lib_ring_buffer_nesting_count(). | |
74 | */ | |
75 | typedef struct lttng_ust_lib_ring_buffer_ctx_private private_ctx_stack_t[LIB_RING_BUFFER_MAX_NESTING]; | |
76 | static DEFINE_URCU_TLS(private_ctx_stack_t, private_ctx_stack); | |
77 | ||
78 | /* | |
79 | * Force a read (imply TLS fixup for dlopen) of TLS variables. | |
80 | */ | |
14e0a135 | 81 | void RING_BUFFER_MODE_TEMPLATE_TLS_FIXUP(void) |
8936b6c0 MD |
82 | { |
83 | asm volatile ("" : : "m" (URCU_TLS(private_ctx_stack))); | |
84 | } | |
85 | ||
2208d8b5 MJ |
86 | static inline uint64_t lib_ring_buffer_clock_read( |
87 | struct lttng_ust_lib_ring_buffer_channel *chan __attribute__((unused))) | |
3d1fc7fd MD |
88 | { |
89 | return trace_clock_read64(); | |
90 | } | |
91 | ||
92 | static inline | |
daacdbfc | 93 | size_t ctx_get_aligned_size(size_t offset, struct lttng_ust_ctx *ctx, |
e56bb47c | 94 | size_t ctx_len) |
3d1fc7fd | 95 | { |
3d1fc7fd MD |
96 | size_t orig_offset = offset; |
97 | ||
b5a3dfa5 | 98 | if (caa_likely(!ctx)) |
3d1fc7fd | 99 | return 0; |
3b8bedd8 | 100 | offset += lttng_ust_lib_ring_buffer_align(offset, ctx->largest_align); |
e56bb47c MD |
101 | offset += ctx_len; |
102 | return offset - orig_offset; | |
103 | } | |
104 | ||
105 | static inline | |
daacdbfc | 106 | void ctx_get_struct_size(struct lttng_ust_ctx *ctx, size_t *ctx_len, |
e56bb47c MD |
107 | enum app_ctx_mode mode) |
108 | { | |
109 | int i; | |
110 | size_t offset = 0; | |
111 | ||
112 | if (caa_likely(!ctx)) { | |
113 | *ctx_len = 0; | |
114 | return; | |
115 | } | |
ce7352a2 MD |
116 | for (i = 0; i < ctx->nr_fields; i++) { |
117 | if (mode == APP_CTX_ENABLED) { | |
4e48b5d2 | 118 | offset += ctx->fields[i].get_size(&ctx->fields[i], offset); |
ce7352a2 | 119 | } else { |
4e48b5d2 | 120 | if (lttng_context_is_app(ctx->fields[i].event_field->name)) { |
ce7352a2 MD |
121 | /* |
122 | * Before UST 2.8, we cannot use the | |
123 | * application context, because we | |
124 | * cannot trust that the handler used | |
125 | * for get_size is the same used for | |
126 | * ctx_record, which would result in | |
127 | * corrupted traces when tracing | |
128 | * concurrently with application context | |
129 | * register/unregister. | |
130 | */ | |
4e48b5d2 | 131 | offset += lttng_ust_dummy_get_size(&ctx->fields[i], offset); |
ce7352a2 | 132 | } else { |
4e48b5d2 | 133 | offset += ctx->fields[i].get_size(&ctx->fields[i], offset); |
ce7352a2 MD |
134 | } |
135 | } | |
136 | } | |
e56bb47c | 137 | *ctx_len = offset; |
3d1fc7fd MD |
138 | } |
139 | ||
140 | static inline | |
4cfec15c | 141 | void ctx_record(struct lttng_ust_lib_ring_buffer_ctx *bufctx, |
e7bc0ef6 | 142 | struct lttng_ust_channel_buffer *chan, |
daacdbfc | 143 | struct lttng_ust_ctx *ctx, |
ce7352a2 | 144 | enum app_ctx_mode mode) |
3d1fc7fd MD |
145 | { |
146 | int i; | |
147 | ||
b5a3dfa5 | 148 | if (caa_likely(!ctx)) |
3d1fc7fd | 149 | return; |
3b8bedd8 | 150 | lttng_ust_lib_ring_buffer_align_ctx(bufctx, ctx->largest_align); |
ce7352a2 MD |
151 | for (i = 0; i < ctx->nr_fields; i++) { |
152 | if (mode == APP_CTX_ENABLED) { | |
4e48b5d2 | 153 | ctx->fields[i].record(&ctx->fields[i], bufctx, chan); |
ce7352a2 | 154 | } else { |
4e48b5d2 | 155 | if (lttng_context_is_app(ctx->fields[i].event_field->name)) { |
ce7352a2 MD |
156 | /* |
157 | * Before UST 2.8, we cannot use the | |
158 | * application context, because we | |
159 | * cannot trust that the handler used | |
160 | * for get_size is the same used for | |
161 | * ctx_record, which would result in | |
162 | * corrupted traces when tracing | |
163 | * concurrently with application context | |
164 | * register/unregister. | |
165 | */ | |
4e48b5d2 | 166 | lttng_ust_dummy_record(&ctx->fields[i], bufctx, chan); |
ce7352a2 | 167 | } else { |
4e48b5d2 | 168 | ctx->fields[i].record(&ctx->fields[i], bufctx, chan); |
ce7352a2 MD |
169 | } |
170 | } | |
171 | } | |
3d1fc7fd MD |
172 | } |
173 | ||
174 | /* | |
175 | * record_header_size - Calculate the header size and padding necessary. | |
176 | * @config: ring buffer instance configuration | |
177 | * @chan: channel | |
178 | * @offset: offset in the write buffer | |
179 | * @pre_header_padding: padding to add before the header (output) | |
180 | * @ctx: reservation context | |
181 | * | |
182 | * Returns the event header size (including padding). | |
183 | * | |
184 | * The payload must itself determine its own alignment from the biggest type it | |
185 | * contains. | |
186 | */ | |
187 | static __inline__ | |
2208d8b5 MJ |
188 | size_t record_header_size( |
189 | const struct lttng_ust_lib_ring_buffer_config *config __attribute__((unused)), | |
190 | struct lttng_ust_lib_ring_buffer_channel *chan, | |
191 | size_t offset, | |
192 | size_t *pre_header_padding, | |
193 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
194 | struct lttng_client_ctx *client_ctx) | |
3d1fc7fd | 195 | { |
e7bc0ef6 | 196 | struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan); |
3d1fc7fd MD |
197 | size_t orig_offset = offset; |
198 | size_t padding; | |
199 | ||
e7bc0ef6 | 200 | switch (lttng_chan->priv->header_type) { |
3d1fc7fd | 201 | case 1: /* compact */ |
dc325c1d | 202 | padding = lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint32_t)); |
3d1fc7fd | 203 | offset += padding; |
8936b6c0 | 204 | if (!(ctx->priv->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
205 | offset += sizeof(uint32_t); /* id and timestamp */ |
206 | } else { | |
79dfbf42 MD |
207 | /* Minimum space taken by LTTNG_COMPACT_EVENT_BITS id */ |
208 | offset += (LTTNG_COMPACT_EVENT_BITS + CHAR_BIT - 1) / CHAR_BIT; | |
3d1fc7fd | 209 | /* Align extended struct on largest member */ |
dc325c1d | 210 | offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd | 211 | offset += sizeof(uint32_t); /* id */ |
dc325c1d | 212 | offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd MD |
213 | offset += sizeof(uint64_t); /* timestamp */ |
214 | } | |
215 | break; | |
216 | case 2: /* large */ | |
dc325c1d | 217 | padding = lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint16_t)); |
3d1fc7fd MD |
218 | offset += padding; |
219 | offset += sizeof(uint16_t); | |
8936b6c0 | 220 | if (!(ctx->priv->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
dc325c1d | 221 | offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint32_t)); |
3d1fc7fd MD |
222 | offset += sizeof(uint32_t); /* timestamp */ |
223 | } else { | |
224 | /* Align extended struct on largest member */ | |
dc325c1d | 225 | offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd | 226 | offset += sizeof(uint32_t); /* id */ |
dc325c1d | 227 | offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd MD |
228 | offset += sizeof(uint64_t); /* timestamp */ |
229 | } | |
230 | break; | |
231 | default: | |
9f3fdbc6 | 232 | padding = 0; |
3d1fc7fd MD |
233 | WARN_ON_ONCE(1); |
234 | } | |
0950190a | 235 | offset += ctx_get_aligned_size(offset, client_ctx->chan_ctx, |
2b7080aa | 236 | client_ctx->packet_context_len); |
a40b5b8c | 237 | offset += ctx_get_aligned_size(offset, client_ctx->event_ctx, |
2b7080aa | 238 | client_ctx->event_context_len); |
3d1fc7fd MD |
239 | *pre_header_padding = padding; |
240 | return offset - orig_offset; | |
241 | } | |
242 | ||
9f3fdbc6 | 243 | #include "../libringbuffer/api.h" |
82b9bde8 | 244 | #include "lttng-rb-clients.h" |
3d1fc7fd | 245 | |
9f3fdbc6 | 246 | static |
7dd08bec | 247 | void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 248 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
0950190a | 249 | struct lttng_client_ctx *client_ctx, |
3d1fc7fd MD |
250 | uint32_t event_id); |
251 | ||
252 | /* | |
7dd08bec | 253 | * lttng_write_event_header |
3d1fc7fd MD |
254 | * |
255 | * Writes the event header to the offset (already aligned on 32-bits). | |
256 | * | |
257 | * @config: ring buffer instance configuration | |
258 | * @ctx: reservation context | |
259 | * @event_id: event ID | |
260 | */ | |
261 | static __inline__ | |
7dd08bec | 262 | void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 263 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
0950190a | 264 | struct lttng_client_ctx *client_ctx, |
3d1fc7fd MD |
265 | uint32_t event_id) |
266 | { | |
8936b6c0 | 267 | struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->priv->chan); |
3d1fc7fd | 268 | |
8936b6c0 | 269 | if (caa_unlikely(ctx->priv->rflags)) |
3d1fc7fd MD |
270 | goto slow_path; |
271 | ||
e7bc0ef6 | 272 | switch (lttng_chan->priv->header_type) { |
3d1fc7fd MD |
273 | case 1: /* compact */ |
274 | { | |
275 | uint32_t id_time = 0; | |
276 | ||
79dfbf42 MD |
277 | bt_bitfield_write(&id_time, uint32_t, |
278 | 0, | |
279 | LTTNG_COMPACT_EVENT_BITS, | |
280 | event_id); | |
281 | bt_bitfield_write(&id_time, uint32_t, | |
282 | LTTNG_COMPACT_EVENT_BITS, | |
283 | LTTNG_COMPACT_TSC_BITS, | |
8936b6c0 | 284 | ctx->priv->tsc); |
3d1fc7fd MD |
285 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); |
286 | break; | |
287 | } | |
288 | case 2: /* large */ | |
289 | { | |
8936b6c0 | 290 | uint32_t timestamp = (uint32_t) ctx->priv->tsc; |
3d1fc7fd MD |
291 | uint16_t id = event_id; |
292 | ||
293 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
dc325c1d | 294 | lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint32_t)); |
3d1fc7fd MD |
295 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
296 | break; | |
297 | } | |
298 | default: | |
299 | WARN_ON_ONCE(1); | |
300 | } | |
301 | ||
0950190a | 302 | ctx_record(ctx, lttng_chan, client_ctx->chan_ctx, APP_CTX_ENABLED); |
a40b5b8c | 303 | ctx_record(ctx, lttng_chan, client_ctx->event_ctx, APP_CTX_ENABLED); |
3b8bedd8 | 304 | lttng_ust_lib_ring_buffer_align_ctx(ctx, ctx->largest_align); |
3d1fc7fd MD |
305 | |
306 | return; | |
307 | ||
308 | slow_path: | |
0950190a | 309 | lttng_write_event_header_slow(config, ctx, client_ctx, event_id); |
3d1fc7fd MD |
310 | } |
311 | ||
9f3fdbc6 | 312 | static |
7dd08bec | 313 | void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, |
4cfec15c | 314 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
0950190a | 315 | struct lttng_client_ctx *client_ctx, |
3d1fc7fd MD |
316 | uint32_t event_id) |
317 | { | |
8936b6c0 MD |
318 | struct lttng_ust_lib_ring_buffer_ctx_private *ctx_private = ctx->priv; |
319 | struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->priv->chan); | |
3d1fc7fd | 320 | |
e7bc0ef6 | 321 | switch (lttng_chan->priv->header_type) { |
3d1fc7fd | 322 | case 1: /* compact */ |
8936b6c0 | 323 | if (!(ctx_private->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
3d1fc7fd MD |
324 | uint32_t id_time = 0; |
325 | ||
79dfbf42 MD |
326 | bt_bitfield_write(&id_time, uint32_t, |
327 | 0, | |
328 | LTTNG_COMPACT_EVENT_BITS, | |
329 | event_id); | |
330 | bt_bitfield_write(&id_time, uint32_t, | |
331 | LTTNG_COMPACT_EVENT_BITS, | |
332 | LTTNG_COMPACT_TSC_BITS, | |
8936b6c0 | 333 | ctx_private->tsc); |
3d1fc7fd MD |
334 | lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); |
335 | } else { | |
336 | uint8_t id = 0; | |
8936b6c0 | 337 | uint64_t timestamp = ctx_private->tsc; |
3d1fc7fd | 338 | |
79dfbf42 MD |
339 | bt_bitfield_write(&id, uint8_t, |
340 | 0, | |
341 | LTTNG_COMPACT_EVENT_BITS, | |
342 | 31); | |
3d1fc7fd MD |
343 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); |
344 | /* Align extended struct on largest member */ | |
dc325c1d | 345 | lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd | 346 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
dc325c1d | 347 | lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd MD |
348 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
349 | } | |
350 | break; | |
351 | case 2: /* large */ | |
352 | { | |
8936b6c0 MD |
353 | if (!(ctx_private->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { |
354 | uint32_t timestamp = (uint32_t) ctx_private->tsc; | |
3d1fc7fd MD |
355 | uint16_t id = event_id; |
356 | ||
357 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
dc325c1d | 358 | lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint32_t)); |
3d1fc7fd MD |
359 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
360 | } else { | |
361 | uint16_t id = 65535; | |
8936b6c0 | 362 | uint64_t timestamp = ctx_private->tsc; |
3d1fc7fd MD |
363 | |
364 | lib_ring_buffer_write(config, ctx, &id, sizeof(id)); | |
365 | /* Align extended struct on largest member */ | |
dc325c1d | 366 | lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd | 367 | lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); |
dc325c1d | 368 | lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t)); |
3d1fc7fd MD |
369 | lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); |
370 | } | |
371 | break; | |
372 | } | |
373 | default: | |
374 | WARN_ON_ONCE(1); | |
375 | } | |
0950190a | 376 | ctx_record(ctx, lttng_chan, client_ctx->chan_ctx, APP_CTX_ENABLED); |
a40b5b8c | 377 | ctx_record(ctx, lttng_chan, client_ctx->event_ctx, APP_CTX_ENABLED); |
3b8bedd8 | 378 | lttng_ust_lib_ring_buffer_align_ctx(ctx, ctx->largest_align); |
3d1fc7fd MD |
379 | } |
380 | ||
4cfec15c | 381 | static const struct lttng_ust_lib_ring_buffer_config client_config; |
3d1fc7fd | 382 | |
5198080d | 383 | static uint64_t client_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan) |
3d1fc7fd MD |
384 | { |
385 | return lib_ring_buffer_clock_read(chan); | |
386 | } | |
387 | ||
388 | static | |
4cfec15c | 389 | size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, |
5198080d MJ |
390 | struct lttng_ust_lib_ring_buffer_channel *chan, |
391 | size_t offset, | |
3d1fc7fd | 392 | size_t *pre_header_padding, |
e56bb47c MD |
393 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
394 | void *client_ctx) | |
3d1fc7fd MD |
395 | { |
396 | return record_header_size(config, chan, offset, | |
e56bb47c | 397 | pre_header_padding, ctx, client_ctx); |
3d1fc7fd MD |
398 | } |
399 | ||
400 | /** | |
401 | * client_packet_header_size - called on buffer-switch to a new sub-buffer | |
402 | * | |
403 | * Return header size without padding after the structure. Don't use packed | |
404 | * structure because gcc generates inefficient code on some architectures | |
405 | * (powerpc, mips..) | |
406 | */ | |
407 | static size_t client_packet_header_size(void) | |
408 | { | |
409 | return offsetof(struct packet_header, ctx.header_end); | |
410 | } | |
411 | ||
23c8854a | 412 | static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc, |
1d498196 | 413 | unsigned int subbuf_idx, |
38fae1d3 | 414 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 415 | { |
5198080d | 416 | struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
417 | struct packet_header *header = |
418 | (struct packet_header *) | |
419 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
420 | subbuf_idx * chan->backend.subbuf_size, |
421 | handle); | |
e7bc0ef6 | 422 | struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan); |
1ff31389 | 423 | uint64_t cnt = shmp_index(handle, buf->backend.buf_cnt, subbuf_idx)->seq_cnt; |
3d1fc7fd | 424 | |
34daae3e MD |
425 | assert(header); |
426 | if (!header) | |
427 | return; | |
3d1fc7fd | 428 | header->magic = CTF_MAGIC_NUMBER; |
e7bc0ef6 MD |
429 | memcpy(header->uuid, lttng_chan->priv->uuid, sizeof(lttng_chan->priv->uuid)); |
430 | header->stream_id = lttng_chan->priv->id; | |
2d94adc5 | 431 | header->stream_instance_id = buf->backend.cpu; |
3d1fc7fd MD |
432 | header->ctx.timestamp_begin = tsc; |
433 | header->ctx.timestamp_end = 0; | |
0c00a107 MD |
434 | header->ctx.content_size = ~0ULL; /* for debugging */ |
435 | header->ctx.packet_size = ~0ULL; | |
1ff31389 | 436 | header->ctx.packet_seq_num = chan->backend.num_subbuf * cnt + subbuf_idx; |
3d1fc7fd | 437 | header->ctx.events_discarded = 0; |
3d1fc7fd MD |
438 | header->ctx.cpu_id = buf->backend.cpu; |
439 | } | |
440 | ||
441 | /* | |
442 | * offset is assumed to never be 0 here : never deliver a completely empty | |
443 | * subbuffer. data_size is between 1 and subbuf_size. | |
444 | */ | |
23c8854a | 445 | static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc, |
1d498196 | 446 | unsigned int subbuf_idx, unsigned long data_size, |
38fae1d3 | 447 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 448 | { |
5198080d | 449 | struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
450 | struct packet_header *header = |
451 | (struct packet_header *) | |
452 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
453 | subbuf_idx * chan->backend.subbuf_size, |
454 | handle); | |
3d1fc7fd MD |
455 | unsigned long records_lost = 0; |
456 | ||
34daae3e MD |
457 | assert(header); |
458 | if (!header) | |
459 | return; | |
3d1fc7fd | 460 | header->ctx.timestamp_end = tsc; |
b1830883 MD |
461 | header->ctx.content_size = |
462 | (uint64_t) data_size * CHAR_BIT; /* in bits */ | |
463 | header->ctx.packet_size = | |
b72687b8 | 464 | (uint64_t) LTTNG_UST_PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ |
04489ab4 MD |
465 | |
466 | records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf); | |
3d1fc7fd MD |
467 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); |
468 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
469 | header->ctx.events_discarded = records_lost; | |
470 | } | |
471 | ||
2208d8b5 MJ |
472 | static int client_buffer_create( |
473 | struct lttng_ust_lib_ring_buffer *buf __attribute__((unused)), | |
474 | void *priv __attribute__((unused)), | |
475 | int cpu __attribute__((unused)), | |
476 | const char *name __attribute__((unused)), | |
477 | struct lttng_ust_shm_handle *handle __attribute__((unused))) | |
3d1fc7fd MD |
478 | { |
479 | return 0; | |
480 | } | |
481 | ||
2208d8b5 MJ |
482 | static void client_buffer_finalize( |
483 | struct lttng_ust_lib_ring_buffer *buf __attribute__((unused)), | |
484 | void *priv __attribute__((unused)), | |
485 | int cpu __attribute__((unused)), | |
486 | struct lttng_ust_shm_handle *handle __attribute__((unused))) | |
3d1fc7fd MD |
487 | { |
488 | } | |
489 | ||
2208d8b5 MJ |
490 | static void client_content_size_field( |
491 | const struct lttng_ust_lib_ring_buffer_config *config __attribute__((unused)), | |
492 | size_t *offset, size_t *length) | |
a9ff648c MD |
493 | { |
494 | *offset = offsetof(struct packet_header, ctx.content_size); | |
495 | *length = sizeof(((struct packet_header *) NULL)->ctx.content_size); | |
496 | } | |
497 | ||
2208d8b5 MJ |
498 | static void client_packet_size_field( |
499 | const struct lttng_ust_lib_ring_buffer_config *config __attribute__((unused)), | |
500 | size_t *offset, size_t *length) | |
a9ff648c MD |
501 | { |
502 | *offset = offsetof(struct packet_header, ctx.packet_size); | |
503 | *length = sizeof(((struct packet_header *) NULL)->ctx.packet_size); | |
504 | } | |
505 | ||
b2f3252a JD |
506 | static struct packet_header *client_packet_header(struct lttng_ust_lib_ring_buffer *buf, |
507 | struct lttng_ust_shm_handle *handle) | |
508 | { | |
c4d6bd10 | 509 | return lib_ring_buffer_read_offset_address(&buf->backend, 0, handle); |
b2f3252a JD |
510 | } |
511 | ||
512 | static int client_timestamp_begin(struct lttng_ust_lib_ring_buffer *buf, | |
07539b34 | 513 | struct lttng_ust_lib_ring_buffer_channel *chan, |
b2f3252a JD |
514 | uint64_t *timestamp_begin) |
515 | { | |
07539b34 | 516 | struct lttng_ust_shm_handle *handle = chan->handle; |
b2f3252a JD |
517 | struct packet_header *header; |
518 | ||
519 | header = client_packet_header(buf, handle); | |
34daae3e MD |
520 | if (!header) |
521 | return -1; | |
b2f3252a JD |
522 | *timestamp_begin = header->ctx.timestamp_begin; |
523 | return 0; | |
524 | } | |
525 | ||
526 | static int client_timestamp_end(struct lttng_ust_lib_ring_buffer *buf, | |
07539b34 | 527 | struct lttng_ust_lib_ring_buffer_channel *chan, |
b2f3252a JD |
528 | uint64_t *timestamp_end) |
529 | { | |
07539b34 | 530 | struct lttng_ust_shm_handle *handle = chan->handle; |
b2f3252a JD |
531 | struct packet_header *header; |
532 | ||
533 | header = client_packet_header(buf, handle); | |
34daae3e MD |
534 | if (!header) |
535 | return -1; | |
b2f3252a JD |
536 | *timestamp_end = header->ctx.timestamp_end; |
537 | return 0; | |
538 | } | |
539 | ||
540 | static int client_events_discarded(struct lttng_ust_lib_ring_buffer *buf, | |
07539b34 | 541 | struct lttng_ust_lib_ring_buffer_channel *chan, |
b2f3252a JD |
542 | uint64_t *events_discarded) |
543 | { | |
07539b34 | 544 | struct lttng_ust_shm_handle *handle = chan->handle; |
b2f3252a JD |
545 | struct packet_header *header; |
546 | ||
547 | header = client_packet_header(buf, handle); | |
34daae3e MD |
548 | if (!header) |
549 | return -1; | |
b2f3252a JD |
550 | *events_discarded = header->ctx.events_discarded; |
551 | return 0; | |
552 | } | |
553 | ||
554 | static int client_content_size(struct lttng_ust_lib_ring_buffer *buf, | |
07539b34 | 555 | struct lttng_ust_lib_ring_buffer_channel *chan, |
b2f3252a JD |
556 | uint64_t *content_size) |
557 | { | |
07539b34 | 558 | struct lttng_ust_shm_handle *handle = chan->handle; |
b2f3252a JD |
559 | struct packet_header *header; |
560 | ||
561 | header = client_packet_header(buf, handle); | |
34daae3e MD |
562 | if (!header) |
563 | return -1; | |
b2f3252a JD |
564 | *content_size = header->ctx.content_size; |
565 | return 0; | |
566 | } | |
567 | ||
568 | static int client_packet_size(struct lttng_ust_lib_ring_buffer *buf, | |
07539b34 | 569 | struct lttng_ust_lib_ring_buffer_channel *chan, |
b2f3252a JD |
570 | uint64_t *packet_size) |
571 | { | |
07539b34 | 572 | struct lttng_ust_shm_handle *handle = chan->handle; |
b2f3252a JD |
573 | struct packet_header *header; |
574 | ||
575 | header = client_packet_header(buf, handle); | |
34daae3e MD |
576 | if (!header) |
577 | return -1; | |
b2f3252a JD |
578 | *packet_size = header->ctx.packet_size; |
579 | return 0; | |
580 | } | |
581 | ||
2208d8b5 | 582 | static int client_stream_id(struct lttng_ust_lib_ring_buffer *buf __attribute__((unused)), |
07539b34 | 583 | struct lttng_ust_lib_ring_buffer_channel *chan, |
b2f3252a JD |
584 | uint64_t *stream_id) |
585 | { | |
e7bc0ef6 | 586 | struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan); |
db95cf8b | 587 | |
e7bc0ef6 | 588 | *stream_id = lttng_chan->priv->id; |
b2f3252a | 589 | |
b2f3252a JD |
590 | return 0; |
591 | } | |
592 | ||
2208d8b5 MJ |
593 | static int client_current_timestamp( |
594 | struct lttng_ust_lib_ring_buffer *buf __attribute__((unused)), | |
07539b34 | 595 | struct lttng_ust_lib_ring_buffer_channel *chan, |
fca361e8 JD |
596 | uint64_t *ts) |
597 | { | |
fca361e8 JD |
598 | *ts = client_ring_buffer_clock_read(chan); |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
1ff31389 | 603 | static int client_sequence_number(struct lttng_ust_lib_ring_buffer *buf, |
07539b34 | 604 | struct lttng_ust_lib_ring_buffer_channel *chan, |
1ff31389 JD |
605 | uint64_t *seq) |
606 | { | |
07539b34 | 607 | struct lttng_ust_shm_handle *handle = chan->handle; |
1ff31389 JD |
608 | struct packet_header *header; |
609 | ||
610 | header = client_packet_header(buf, handle); | |
3e1db88d MD |
611 | if (!header) |
612 | return -1; | |
1ff31389 JD |
613 | *seq = header->ctx.packet_seq_num; |
614 | return 0; | |
615 | } | |
616 | ||
45a00b05 | 617 | static int client_instance_id(struct lttng_ust_lib_ring_buffer *buf, |
2208d8b5 | 618 | struct lttng_ust_lib_ring_buffer_channel *chan __attribute__((unused)), |
45a00b05 JD |
619 | uint64_t *id) |
620 | { | |
db95cf8b | 621 | *id = buf->backend.cpu; |
45a00b05 | 622 | |
45a00b05 JD |
623 | return 0; |
624 | } | |
625 | ||
82b9bde8 JD |
626 | static const |
627 | struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = { | |
628 | .parent = { | |
629 | .ring_buffer_clock_read = client_ring_buffer_clock_read, | |
630 | .record_header_size = client_record_header_size, | |
631 | .subbuffer_header_size = client_packet_header_size, | |
632 | .buffer_begin = client_buffer_begin, | |
633 | .buffer_end = client_buffer_end, | |
634 | .buffer_create = client_buffer_create, | |
635 | .buffer_finalize = client_buffer_finalize, | |
a9ff648c MD |
636 | .content_size_field = client_content_size_field, |
637 | .packet_size_field = client_packet_size_field, | |
82b9bde8 | 638 | }, |
b2f3252a JD |
639 | .timestamp_begin = client_timestamp_begin, |
640 | .timestamp_end = client_timestamp_end, | |
641 | .events_discarded = client_events_discarded, | |
642 | .content_size = client_content_size, | |
643 | .packet_size = client_packet_size, | |
644 | .stream_id = client_stream_id, | |
fca361e8 | 645 | .current_timestamp = client_current_timestamp, |
1ff31389 | 646 | .sequence_number = client_sequence_number, |
45a00b05 | 647 | .instance_id = client_instance_id, |
82b9bde8 JD |
648 | }; |
649 | ||
4cfec15c | 650 | static const struct lttng_ust_lib_ring_buffer_config client_config = { |
3d1fc7fd MD |
651 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, |
652 | .cb.record_header_size = client_record_header_size, | |
653 | .cb.subbuffer_header_size = client_packet_header_size, | |
654 | .cb.buffer_begin = client_buffer_begin, | |
655 | .cb.buffer_end = client_buffer_end, | |
656 | .cb.buffer_create = client_buffer_create, | |
657 | .cb.buffer_finalize = client_buffer_finalize, | |
a9ff648c MD |
658 | .cb.content_size_field = client_content_size_field, |
659 | .cb.packet_size_field = client_packet_size_field, | |
3d1fc7fd | 660 | |
79dfbf42 | 661 | .tsc_bits = LTTNG_COMPACT_TSC_BITS, |
3d1fc7fd | 662 | .alloc = RING_BUFFER_ALLOC_PER_CPU, |
5d61a504 | 663 | .sync = RING_BUFFER_SYNC_GLOBAL, |
3d1fc7fd MD |
664 | .mode = RING_BUFFER_MODE_TEMPLATE, |
665 | .backend = RING_BUFFER_PAGE, | |
5d61a504 | 666 | .output = RING_BUFFER_MMAP, |
3d1fc7fd | 667 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
5d61a504 | 668 | .ipi = RING_BUFFER_NO_IPI_BARRIER, |
34a91bdb | 669 | .wakeup = LTTNG_CLIENT_WAKEUP, |
c1fca457 | 670 | .client_type = LTTNG_CLIENT_TYPE, |
82b9bde8 JD |
671 | |
672 | .cb_ptr = &client_cb.parent, | |
3d1fc7fd MD |
673 | }; |
674 | ||
675 | static | |
e7bc0ef6 | 676 | struct lttng_ust_channel_buffer *_channel_create(const char *name, |
a3f61e7f | 677 | void *buf_addr, |
3d1fc7fd MD |
678 | size_t subbuf_size, size_t num_subbuf, |
679 | unsigned int switch_timer_interval, | |
193183fb | 680 | unsigned int read_timer_interval, |
6ca18e66 | 681 | unsigned char *uuid, |
a9ff648c | 682 | uint32_t chan_id, |
b2c5f61a MD |
683 | const int *stream_fds, int nr_stream_fds, |
684 | int64_t blocking_timeout) | |
3d1fc7fd | 685 | { |
f0fde1c3 | 686 | struct lttng_ust_abi_channel_config chan_priv_init; |
a3f61e7f | 687 | struct lttng_ust_shm_handle *handle; |
e7bc0ef6 | 688 | struct lttng_ust_channel_buffer *lttng_chan_buf; |
f0fde1c3 | 689 | |
e7bc0ef6 MD |
690 | lttng_chan_buf = lttng_ust_alloc_channel_buffer(); |
691 | if (!lttng_chan_buf) | |
f0fde1c3 | 692 | return NULL; |
e7bc0ef6 MD |
693 | memcpy(lttng_chan_buf->priv->uuid, uuid, LTTNG_UST_UUID_LEN); |
694 | lttng_chan_buf->priv->id = chan_id; | |
a3f61e7f | 695 | |
74d81a6c MD |
696 | memset(&chan_priv_init, 0, sizeof(chan_priv_init)); |
697 | memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN); | |
6ca18e66 | 698 | chan_priv_init.id = chan_id; |
f0fde1c3 | 699 | |
a3f61e7f | 700 | handle = channel_create(&client_config, name, |
f0fde1c3 MD |
701 | __alignof__(struct lttng_ust_abi_channel_config), |
702 | sizeof(struct lttng_ust_abi_channel_config), | |
74d81a6c | 703 | &chan_priv_init, |
e7bc0ef6 | 704 | lttng_chan_buf, buf_addr, subbuf_size, num_subbuf, |
a9ff648c | 705 | switch_timer_interval, read_timer_interval, |
b2c5f61a | 706 | stream_fds, nr_stream_fds, blocking_timeout); |
a3f61e7f | 707 | if (!handle) |
f0fde1c3 | 708 | goto error; |
07539b34 | 709 | lttng_chan_buf->priv->rb_chan = shmp(handle, handle->chan); |
e7bc0ef6 | 710 | return lttng_chan_buf; |
f0fde1c3 MD |
711 | |
712 | error: | |
e7bc0ef6 | 713 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
f0fde1c3 | 714 | return NULL; |
3d1fc7fd MD |
715 | } |
716 | ||
717 | static | |
e7bc0ef6 | 718 | void lttng_channel_destroy(struct lttng_ust_channel_buffer *lttng_chan_buf) |
3d1fc7fd | 719 | { |
07539b34 | 720 | channel_destroy(lttng_chan_buf->priv->rb_chan, lttng_chan_buf->priv->rb_chan->handle, 1); |
e7bc0ef6 | 721 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
3d1fc7fd MD |
722 | } |
723 | ||
724 | static | |
8936b6c0 | 725 | int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd | 726 | { |
8936b6c0 | 727 | struct lttng_ust_event_recorder *event_recorder = ctx->client_priv; |
07539b34 | 728 | struct lttng_ust_channel_buffer *lttng_chan = event_recorder->chan; |
e56bb47c | 729 | struct lttng_client_ctx client_ctx; |
8936b6c0 MD |
730 | int ret, nesting; |
731 | struct lttng_ust_lib_ring_buffer_ctx_private *private_ctx; | |
732 | uint32_t event_id; | |
3d1fc7fd | 733 | |
8936b6c0 | 734 | event_id = event_recorder->priv->id; |
0950190a | 735 | client_ctx.chan_ctx = lttng_ust_rcu_dereference(lttng_chan->priv->ctx); |
a40b5b8c | 736 | client_ctx.event_ctx = lttng_ust_rcu_dereference(event_recorder->priv->ctx); |
e56bb47c | 737 | /* Compute internal size of context structures. */ |
0950190a | 738 | ctx_get_struct_size(client_ctx.chan_ctx, &client_ctx.packet_context_len, |
2b7080aa | 739 | APP_CTX_ENABLED); |
a40b5b8c | 740 | ctx_get_struct_size(client_ctx.event_ctx, &client_ctx.event_context_len, |
2b7080aa | 741 | APP_CTX_ENABLED); |
e56bb47c | 742 | |
8936b6c0 MD |
743 | nesting = lib_ring_buffer_nesting_inc(&client_config); |
744 | if (nesting < 0) | |
3d1fc7fd | 745 | return -EPERM; |
3d1fc7fd | 746 | |
f37bd904 | 747 | private_ctx = &URCU_TLS(private_ctx_stack)[nesting]; |
8936b6c0 MD |
748 | memset(private_ctx, 0, sizeof(*private_ctx)); |
749 | private_ctx->pub = ctx; | |
750 | private_ctx->chan = lttng_chan->priv->rb_chan; | |
751 | ||
752 | ctx->priv = private_ctx; | |
753 | ||
e7bc0ef6 | 754 | switch (lttng_chan->priv->header_type) { |
3d1fc7fd MD |
755 | case 1: /* compact */ |
756 | if (event_id > 30) | |
8936b6c0 | 757 | private_ctx->rflags |= LTTNG_RFLAG_EXTENDED; |
3d1fc7fd MD |
758 | break; |
759 | case 2: /* large */ | |
760 | if (event_id > 65534) | |
8936b6c0 | 761 | private_ctx->rflags |= LTTNG_RFLAG_EXTENDED; |
3d1fc7fd MD |
762 | break; |
763 | default: | |
764 | WARN_ON_ONCE(1); | |
765 | } | |
766 | ||
e56bb47c | 767 | ret = lib_ring_buffer_reserve(&client_config, ctx, &client_ctx); |
630d6836 | 768 | if (caa_unlikely(ret)) |
3d1fc7fd | 769 | goto put; |
2b7080aa | 770 | if (lib_ring_buffer_backend_get_pages(&client_config, ctx, |
8936b6c0 | 771 | &private_ctx->backend_pages)) { |
2b7080aa MD |
772 | ret = -EPERM; |
773 | goto put; | |
a3492932 | 774 | } |
0950190a | 775 | lttng_write_event_header(&client_config, ctx, &client_ctx, event_id); |
3d1fc7fd MD |
776 | return 0; |
777 | put: | |
7489fcb4 | 778 | lib_ring_buffer_nesting_dec(&client_config); |
3d1fc7fd MD |
779 | return ret; |
780 | } | |
781 | ||
782 | static | |
7dd08bec | 783 | void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
784 | { |
785 | lib_ring_buffer_commit(&client_config, ctx); | |
7489fcb4 | 786 | lib_ring_buffer_nesting_dec(&client_config); |
3d1fc7fd MD |
787 | } |
788 | ||
789 | static | |
8936b6c0 MD |
790 | void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
791 | const void *src, size_t len, size_t alignment) | |
3d1fc7fd | 792 | { |
8936b6c0 | 793 | lttng_ust_lib_ring_buffer_align_ctx(ctx, alignment); |
3d1fc7fd MD |
794 | lib_ring_buffer_write(&client_config, ctx, src, len); |
795 | } | |
796 | ||
a44c74d9 | 797 | static |
8936b6c0 MD |
798 | void lttng_event_strcpy(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
799 | const char *src, size_t len) | |
a44c74d9 MD |
800 | { |
801 | lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#'); | |
802 | } | |
803 | ||
27927814 | 804 | static |
879f9b0a | 805 | void lttng_event_pstrcpy_pad(struct lttng_ust_lib_ring_buffer_ctx *ctx, |
8936b6c0 | 806 | const char *src, size_t len) |
27927814 | 807 | { |
879f9b0a | 808 | lib_ring_buffer_pstrcpy(&client_config, ctx, src, len, '\0'); |
27927814 MD |
809 | } |
810 | ||
3d1fc7fd | 811 | static |
07539b34 | 812 | int lttng_is_finalized(struct lttng_ust_channel_buffer *chan) |
3d1fc7fd | 813 | { |
07539b34 | 814 | struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan; |
3d1fc7fd | 815 | |
07539b34 | 816 | return lib_ring_buffer_channel_is_finalized(rb_chan); |
3d1fc7fd MD |
817 | } |
818 | ||
819 | static | |
07539b34 | 820 | int lttng_is_disabled(struct lttng_ust_channel_buffer *chan) |
3d1fc7fd | 821 | { |
07539b34 | 822 | struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan; |
3d1fc7fd | 823 | |
07539b34 | 824 | return lib_ring_buffer_channel_is_disabled(rb_chan); |
3d1fc7fd MD |
825 | } |
826 | ||
43861eab | 827 | static |
07539b34 | 828 | int lttng_flush_buffer(struct lttng_ust_channel_buffer *chan) |
43861eab | 829 | { |
07539b34 | 830 | struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan; |
4cfec15c | 831 | struct lttng_ust_lib_ring_buffer *buf; |
43861eab MD |
832 | int cpu; |
833 | ||
07539b34 | 834 | for_each_channel_cpu(cpu, rb_chan) { |
74d81a6c MD |
835 | int shm_fd, wait_fd, wakeup_fd; |
836 | uint64_t memory_map_size; | |
43861eab | 837 | |
07539b34 MD |
838 | buf = channel_get_ring_buffer(&client_config, rb_chan, |
839 | cpu, rb_chan->handle, &shm_fd, &wait_fd, | |
74d81a6c | 840 | &wakeup_fd, &memory_map_size); |
43861eab | 841 | lib_ring_buffer_switch(&client_config, buf, |
07539b34 | 842 | SWITCH_ACTIVE, rb_chan->handle); |
43861eab MD |
843 | } |
844 | return 0; | |
845 | } | |
846 | ||
7dd08bec | 847 | static struct lttng_transport lttng_relay_transport = { |
818173b9 | 848 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap", |
3d1fc7fd | 849 | .ops = { |
14b6f891 MD |
850 | .struct_size = sizeof(struct lttng_ust_channel_buffer_ops), |
851 | .priv = __LTTNG_COMPOUND_LITERAL(struct lttng_ust_channel_buffer_ops_private, { | |
a880bae5 MD |
852 | .pub = <tng_relay_transport.ops, |
853 | .channel_create = _channel_create, | |
854 | .channel_destroy = lttng_channel_destroy, | |
855 | .packet_avail_size = NULL, /* Would be racy anyway */ | |
856 | .is_finalized = lttng_is_finalized, | |
857 | .is_disabled = lttng_is_disabled, | |
858 | .flush_buffer = lttng_flush_buffer, | |
859 | }), | |
7dd08bec MD |
860 | .event_reserve = lttng_event_reserve, |
861 | .event_commit = lttng_event_commit, | |
862 | .event_write = lttng_event_write, | |
a44c74d9 | 863 | .event_strcpy = lttng_event_strcpy, |
879f9b0a | 864 | .event_pstrcpy_pad = lttng_event_pstrcpy_pad, |
3d1fc7fd | 865 | }, |
74d81a6c | 866 | .client_config = &client_config, |
3d1fc7fd MD |
867 | }; |
868 | ||
edaa1431 | 869 | void RING_BUFFER_MODE_TEMPLATE_INIT(void) |
3d1fc7fd | 870 | { |
34a91bdb MD |
871 | DBG("LTT : ltt ring buffer client \"%s\" init\n", |
872 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 873 | lttng_transport_register(<tng_relay_transport); |
3d1fc7fd MD |
874 | } |
875 | ||
edaa1431 | 876 | void RING_BUFFER_MODE_TEMPLATE_EXIT(void) |
3d1fc7fd | 877 | { |
34a91bdb MD |
878 | DBG("LTT : ltt ring buffer client \"%s\" exit\n", |
879 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 880 | lttng_transport_unregister(<tng_relay_transport); |
3d1fc7fd | 881 | } |