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 | 12 | |
8cd08025 MJ |
13 | #include <urcu/tls-compat.h> |
14 | ||
9d315d6d MJ |
15 | #include "common/bitfield.h" |
16 | #include "common/align.h" | |
8cd08025 MJ |
17 | #include "common/events.h" |
18 | #include "common/tracer.h" | |
e4db8f98 | 19 | #include "common/ringbuffer/frontend_types.h" |
3d1fc7fd MD |
20 | |
21 | struct metadata_packet_header { | |
22 | uint32_t magic; /* 0x75D11D57 */ | |
19d8b1b3 | 23 | uint8_t uuid[LTTNG_UST_UUID_LEN]; /* Unique Universal Identifier */ |
3d1fc7fd MD |
24 | uint32_t checksum; /* 0 if unused */ |
25 | uint32_t content_size; /* in bits */ | |
26 | uint32_t packet_size; /* in bits */ | |
27 | uint8_t compression_scheme; /* 0 if unused */ | |
28 | uint8_t encryption_scheme; /* 0 if unused */ | |
29 | uint8_t checksum_scheme; /* 0 if unused */ | |
8a98a75d MD |
30 | uint8_t major; /* CTF spec major version number */ |
31 | uint8_t minor; /* CTF spec minor version number */ | |
3d1fc7fd MD |
32 | uint8_t header_end[0]; |
33 | }; | |
34 | ||
35 | struct metadata_record_header { | |
36 | uint8_t header_end[0]; /* End of header */ | |
37 | }; | |
38 | ||
b5457df5 | 39 | static const struct lttng_ust_ring_buffer_config client_config; |
3d1fc7fd | 40 | |
8936b6c0 | 41 | /* No nested use supported for metadata ring buffer. */ |
b5457df5 | 42 | static DEFINE_URCU_TLS(struct lttng_ust_ring_buffer_ctx_private, private_ctx); |
8936b6c0 | 43 | |
2208d8b5 | 44 | static inline uint64_t lib_ring_buffer_clock_read( |
b5457df5 | 45 | struct lttng_ust_ring_buffer_channel *chan __attribute__((unused))) |
3d1fc7fd MD |
46 | { |
47 | return 0; | |
48 | } | |
49 | ||
50 | static inline | |
2208d8b5 | 51 | size_t record_header_size( |
b5457df5 MD |
52 | const struct lttng_ust_ring_buffer_config *config __attribute__((unused)), |
53 | struct lttng_ust_ring_buffer_channel *chan __attribute__((unused)), | |
2208d8b5 MJ |
54 | size_t offset __attribute__((unused)), |
55 | size_t *pre_header_padding __attribute__((unused)), | |
b5457df5 | 56 | struct lttng_ust_ring_buffer_ctx *ctx __attribute__((unused)), |
2208d8b5 | 57 | void *client_ctx __attribute__((unused))) |
3d1fc7fd MD |
58 | { |
59 | return 0; | |
60 | } | |
61 | ||
e4db8f98 | 62 | #include "common/ringbuffer/api.h" |
8cd08025 | 63 | #include "common/ringbuffer-clients/clients.h" |
3d1fc7fd | 64 | |
2208d8b5 | 65 | static uint64_t client_ring_buffer_clock_read( |
b5457df5 | 66 | struct lttng_ust_ring_buffer_channel *chan __attribute__((unused))) |
3d1fc7fd MD |
67 | { |
68 | return 0; | |
69 | } | |
70 | ||
71 | static | |
2208d8b5 | 72 | size_t client_record_header_size( |
b5457df5 MD |
73 | const struct lttng_ust_ring_buffer_config *config __attribute__((unused)), |
74 | struct lttng_ust_ring_buffer_channel *chan __attribute__((unused)), | |
2208d8b5 MJ |
75 | size_t offset __attribute__((unused)), |
76 | size_t *pre_header_padding __attribute__((unused)), | |
b5457df5 | 77 | struct lttng_ust_ring_buffer_ctx *ctx __attribute__((unused)), |
2208d8b5 | 78 | void *client_ctx __attribute__((unused))) |
3d1fc7fd MD |
79 | { |
80 | return 0; | |
81 | } | |
82 | ||
83 | /** | |
84 | * client_packet_header_size - called on buffer-switch to a new sub-buffer | |
85 | * | |
86 | * Return header size without padding after the structure. Don't use packed | |
87 | * structure because gcc generates inefficient code on some architectures | |
88 | * (powerpc, mips..) | |
89 | */ | |
90 | static size_t client_packet_header_size(void) | |
91 | { | |
92 | return offsetof(struct metadata_packet_header, header_end); | |
93 | } | |
94 | ||
b5457df5 | 95 | static void client_buffer_begin(struct lttng_ust_ring_buffer *buf, |
2208d8b5 MJ |
96 | uint64_t tsc __attribute__((unused)), |
97 | unsigned int subbuf_idx, | |
98 | struct lttng_ust_shm_handle *handle) | |
3d1fc7fd | 99 | { |
b5457df5 | 100 | struct lttng_ust_ring_buffer_channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
101 | struct metadata_packet_header *header = |
102 | (struct metadata_packet_header *) | |
103 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
104 | subbuf_idx * chan->backend.subbuf_size, |
105 | handle); | |
e7bc0ef6 | 106 | struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan); |
3d1fc7fd | 107 | |
34daae3e MD |
108 | assert(header); |
109 | if (!header) | |
110 | return; | |
3d1fc7fd | 111 | header->magic = TSDL_MAGIC_NUMBER; |
e7bc0ef6 | 112 | memcpy(header->uuid, lttng_chan->priv->uuid, sizeof(lttng_chan->priv->uuid)); |
3d1fc7fd MD |
113 | header->checksum = 0; /* 0 if unused */ |
114 | header->content_size = 0xFFFFFFFF; /* in bits, for debugging */ | |
115 | header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */ | |
116 | header->compression_scheme = 0; /* 0 if unused */ | |
117 | header->encryption_scheme = 0; /* 0 if unused */ | |
118 | header->checksum_scheme = 0; /* 0 if unused */ | |
8a98a75d MD |
119 | header->major = CTF_SPEC_MAJOR; |
120 | header->minor = CTF_SPEC_MINOR; | |
3d1fc7fd MD |
121 | } |
122 | ||
123 | /* | |
124 | * offset is assumed to never be 0 here : never deliver a completely empty | |
125 | * subbuffer. data_size is between 1 and subbuf_size. | |
126 | */ | |
b5457df5 | 127 | static void client_buffer_end(struct lttng_ust_ring_buffer *buf, |
2208d8b5 MJ |
128 | uint64_t tsc __attribute__((unused)), |
129 | unsigned int subbuf_idx, unsigned long data_size, | |
25f62b0a MD |
130 | struct lttng_ust_shm_handle *handle, |
131 | const struct lttng_ust_ring_buffer_ctx *ctx) | |
3d1fc7fd | 132 | { |
b5457df5 | 133 | struct lttng_ust_ring_buffer_channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
134 | struct metadata_packet_header *header = |
135 | (struct metadata_packet_header *) | |
136 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
137 | subbuf_idx * chan->backend.subbuf_size, |
138 | handle); | |
3d1fc7fd MD |
139 | unsigned long records_lost = 0; |
140 | ||
34daae3e MD |
141 | assert(header); |
142 | if (!header) | |
143 | return; | |
3d1fc7fd | 144 | header->content_size = data_size * CHAR_BIT; /* in bits */ |
b72687b8 | 145 | header->packet_size = LTTNG_UST_PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ |
04489ab4 MD |
146 | /* |
147 | * We do not care about the records lost count, because the metadata | |
148 | * channel waits and retry. | |
149 | */ | |
25f62b0a MD |
150 | (void) lib_ring_buffer_get_records_lost_full(&client_config, ctx); |
151 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, ctx); | |
152 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, ctx); | |
3d1fc7fd MD |
153 | WARN_ON_ONCE(records_lost != 0); |
154 | } | |
155 | ||
2208d8b5 | 156 | static int client_buffer_create( |
b5457df5 | 157 | struct lttng_ust_ring_buffer *buf __attribute__((unused)), |
2208d8b5 MJ |
158 | void *priv __attribute__((unused)), |
159 | int cpu __attribute__((unused)), | |
160 | const char *name __attribute__((unused)), | |
161 | struct lttng_ust_shm_handle *handle __attribute__((unused))) | |
3d1fc7fd MD |
162 | { |
163 | return 0; | |
164 | } | |
165 | ||
2208d8b5 | 166 | static void client_buffer_finalize( |
b5457df5 | 167 | struct lttng_ust_ring_buffer *buf __attribute__((unused)), |
2208d8b5 MJ |
168 | void *priv __attribute__((unused)), |
169 | int cpu __attribute__((unused)), | |
170 | struct lttng_ust_shm_handle *handle __attribute__((unused))) | |
3d1fc7fd MD |
171 | { |
172 | } | |
173 | ||
82b9bde8 JD |
174 | static const |
175 | struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = { | |
176 | .parent = { | |
177 | .ring_buffer_clock_read = client_ring_buffer_clock_read, | |
178 | .record_header_size = client_record_header_size, | |
179 | .subbuffer_header_size = client_packet_header_size, | |
180 | .buffer_begin = client_buffer_begin, | |
181 | .buffer_end = client_buffer_end, | |
182 | .buffer_create = client_buffer_create, | |
183 | .buffer_finalize = client_buffer_finalize, | |
184 | }, | |
185 | }; | |
186 | ||
b5457df5 | 187 | static const struct lttng_ust_ring_buffer_config client_config = { |
3d1fc7fd MD |
188 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, |
189 | .cb.record_header_size = client_record_header_size, | |
190 | .cb.subbuffer_header_size = client_packet_header_size, | |
191 | .cb.buffer_begin = client_buffer_begin, | |
192 | .cb.buffer_end = client_buffer_end, | |
193 | .cb.buffer_create = client_buffer_create, | |
194 | .cb.buffer_finalize = client_buffer_finalize, | |
195 | ||
196 | .tsc_bits = 0, | |
197 | .alloc = RING_BUFFER_ALLOC_GLOBAL, | |
198 | .sync = RING_BUFFER_SYNC_GLOBAL, | |
199 | .mode = RING_BUFFER_MODE_TEMPLATE, | |
200 | .backend = RING_BUFFER_PAGE, | |
5d61a504 | 201 | .output = RING_BUFFER_MMAP, |
3d1fc7fd | 202 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
5d61a504 MD |
203 | .ipi = RING_BUFFER_NO_IPI_BARRIER, |
204 | .wakeup = RING_BUFFER_WAKEUP_BY_WRITER, | |
c1fca457 | 205 | .client_type = LTTNG_CLIENT_TYPE, |
82b9bde8 JD |
206 | |
207 | .cb_ptr = &client_cb.parent, | |
3d1fc7fd MD |
208 | }; |
209 | ||
210 | static | |
e7bc0ef6 | 211 | struct lttng_ust_channel_buffer *_channel_create(const char *name, |
a3f61e7f | 212 | void *buf_addr, |
3d1fc7fd MD |
213 | size_t subbuf_size, size_t num_subbuf, |
214 | unsigned int switch_timer_interval, | |
193183fb | 215 | unsigned int read_timer_interval, |
6ca18e66 | 216 | unsigned char *uuid, |
a9ff648c | 217 | uint32_t chan_id, |
b2c5f61a MD |
218 | const int *stream_fds, int nr_stream_fds, |
219 | int64_t blocking_timeout) | |
3d1fc7fd | 220 | { |
f0fde1c3 | 221 | struct lttng_ust_abi_channel_config chan_priv_init; |
a3f61e7f | 222 | struct lttng_ust_shm_handle *handle; |
e7bc0ef6 | 223 | struct lttng_ust_channel_buffer *lttng_chan_buf; |
f0fde1c3 | 224 | |
e7bc0ef6 MD |
225 | lttng_chan_buf = lttng_ust_alloc_channel_buffer(); |
226 | if (!lttng_chan_buf) | |
f0fde1c3 | 227 | return NULL; |
e7bc0ef6 MD |
228 | memcpy(lttng_chan_buf->priv->uuid, uuid, LTTNG_UST_UUID_LEN); |
229 | lttng_chan_buf->priv->id = chan_id; | |
a3f61e7f | 230 | |
74d81a6c MD |
231 | memset(&chan_priv_init, 0, sizeof(chan_priv_init)); |
232 | memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN); | |
6ca18e66 | 233 | chan_priv_init.id = chan_id; |
f0fde1c3 | 234 | |
a3f61e7f | 235 | handle = channel_create(&client_config, name, |
e7bc0ef6 MD |
236 | __alignof__(struct lttng_ust_channel_buffer), |
237 | sizeof(struct lttng_ust_channel_buffer), | |
74d81a6c | 238 | &chan_priv_init, |
e7bc0ef6 | 239 | lttng_chan_buf, buf_addr, subbuf_size, num_subbuf, |
a9ff648c | 240 | switch_timer_interval, read_timer_interval, |
b2c5f61a | 241 | stream_fds, nr_stream_fds, blocking_timeout); |
a3f61e7f | 242 | if (!handle) |
f0fde1c3 | 243 | goto error; |
07539b34 | 244 | lttng_chan_buf->priv->rb_chan = shmp(handle, handle->chan); |
e7bc0ef6 | 245 | return lttng_chan_buf; |
f0fde1c3 MD |
246 | |
247 | error: | |
e7bc0ef6 | 248 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
f0fde1c3 | 249 | return NULL; |
3d1fc7fd MD |
250 | } |
251 | ||
252 | static | |
e7bc0ef6 | 253 | void lttng_channel_destroy(struct lttng_ust_channel_buffer *lttng_chan_buf) |
3d1fc7fd | 254 | { |
07539b34 | 255 | channel_destroy(lttng_chan_buf->priv->rb_chan, lttng_chan_buf->priv->rb_chan->handle, 1); |
e7bc0ef6 | 256 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
3d1fc7fd MD |
257 | } |
258 | ||
259 | static | |
b5457df5 | 260 | int lttng_event_reserve(struct lttng_ust_ring_buffer_ctx *ctx) |
3d1fc7fd | 261 | { |
a3492932 MD |
262 | int ret; |
263 | ||
b5457df5 | 264 | memset(&URCU_TLS(private_ctx), 0, sizeof(struct lttng_ust_ring_buffer_ctx_private)); |
f37bd904 MD |
265 | URCU_TLS(private_ctx).pub = ctx; |
266 | URCU_TLS(private_ctx).chan = ctx->client_priv; | |
267 | ctx->priv = &URCU_TLS(private_ctx); | |
e56bb47c | 268 | ret = lib_ring_buffer_reserve(&client_config, ctx, NULL); |
a3492932 MD |
269 | if (ret) |
270 | return ret; | |
2b7080aa | 271 | if (lib_ring_buffer_backend_get_pages(&client_config, ctx, |
8936b6c0 | 272 | &ctx->priv->backend_pages)) |
2b7080aa | 273 | return -EPERM; |
a3492932 | 274 | return 0; |
3d1fc7fd MD |
275 | } |
276 | ||
277 | static | |
b5457df5 | 278 | void lttng_event_commit(struct lttng_ust_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
279 | { |
280 | lib_ring_buffer_commit(&client_config, ctx); | |
281 | } | |
282 | ||
283 | static | |
b5457df5 | 284 | void lttng_event_write(struct lttng_ust_ring_buffer_ctx *ctx, |
8936b6c0 | 285 | const void *src, size_t len, size_t alignment) |
3d1fc7fd | 286 | { |
b5457df5 | 287 | lttng_ust_ring_buffer_align_ctx(ctx, alignment); |
3d1fc7fd MD |
288 | lib_ring_buffer_write(&client_config, ctx, src, len); |
289 | } | |
290 | ||
291 | static | |
07539b34 | 292 | size_t lttng_packet_avail_size(struct lttng_ust_channel_buffer *chan) |
3d1fc7fd | 293 | { |
b5457df5 | 294 | struct lttng_ust_ring_buffer_channel *rb_chan = chan->priv->rb_chan; |
3d1fc7fd | 295 | unsigned long o_begin; |
b5457df5 | 296 | struct lttng_ust_ring_buffer *buf; |
3d1fc7fd | 297 | |
07539b34 | 298 | buf = shmp(rb_chan->handle, rb_chan->backend.buf[0].shmp); /* Only for global buffer ! */ |
3d1fc7fd | 299 | o_begin = v_read(&client_config, &buf->offset); |
07539b34 MD |
300 | if (subbuf_offset(o_begin, rb_chan) != 0) { |
301 | return rb_chan->backend.subbuf_size - subbuf_offset(o_begin, rb_chan); | |
3d1fc7fd | 302 | } else { |
07539b34 | 303 | return rb_chan->backend.subbuf_size - subbuf_offset(o_begin, rb_chan) |
3d1fc7fd MD |
304 | - sizeof(struct metadata_packet_header); |
305 | } | |
306 | } | |
307 | ||
308 | static | |
07539b34 | 309 | int lttng_is_finalized(struct lttng_ust_channel_buffer *chan) |
3d1fc7fd | 310 | { |
b5457df5 | 311 | struct lttng_ust_ring_buffer_channel *rb_chan = chan->priv->rb_chan; |
3d1fc7fd | 312 | |
07539b34 | 313 | return lib_ring_buffer_channel_is_finalized(rb_chan); |
3d1fc7fd MD |
314 | } |
315 | ||
316 | static | |
07539b34 | 317 | int lttng_is_disabled(struct lttng_ust_channel_buffer *chan) |
3d1fc7fd | 318 | { |
b5457df5 | 319 | struct lttng_ust_ring_buffer_channel *rb_chan = chan->priv->rb_chan; |
3d1fc7fd | 320 | |
07539b34 | 321 | return lib_ring_buffer_channel_is_disabled(rb_chan); |
3d1fc7fd MD |
322 | } |
323 | ||
43861eab | 324 | static |
07539b34 | 325 | int lttng_flush_buffer(struct lttng_ust_channel_buffer *chan) |
43861eab | 326 | { |
b5457df5 MD |
327 | struct lttng_ust_ring_buffer_channel *rb_chan = chan->priv->rb_chan; |
328 | struct lttng_ust_ring_buffer *buf; | |
74d81a6c MD |
329 | int shm_fd, wait_fd, wakeup_fd; |
330 | uint64_t memory_map_size; | |
434897ee | 331 | void *memory_map_addr; |
43861eab | 332 | |
07539b34 MD |
333 | buf = channel_get_ring_buffer(&client_config, rb_chan, |
334 | 0, rb_chan->handle, &shm_fd, &wait_fd, &wakeup_fd, | |
434897ee | 335 | &memory_map_size, &memory_map_addr); |
43861eab | 336 | lib_ring_buffer_switch(&client_config, buf, |
07539b34 | 337 | SWITCH_ACTIVE, rb_chan->handle); |
43861eab MD |
338 | return 0; |
339 | } | |
340 | ||
7dd08bec | 341 | static struct lttng_transport lttng_relay_transport = { |
818173b9 | 342 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap", |
3d1fc7fd | 343 | .ops = { |
14b6f891 | 344 | .struct_size = sizeof(struct lttng_ust_channel_buffer_ops), |
49926dbd | 345 | |
5defa774 | 346 | .priv = LTTNG_UST_COMPOUND_LITERAL(struct lttng_ust_channel_buffer_ops_private, { |
a880bae5 MD |
347 | .pub = <tng_relay_transport.ops, |
348 | .channel_create = _channel_create, | |
349 | .channel_destroy = lttng_channel_destroy, | |
350 | .packet_avail_size = lttng_packet_avail_size, | |
351 | .is_finalized = lttng_is_finalized, | |
352 | .is_disabled = lttng_is_disabled, | |
353 | .flush_buffer = lttng_flush_buffer, | |
354 | }), | |
7dd08bec MD |
355 | .event_reserve = lttng_event_reserve, |
356 | .event_commit = lttng_event_commit, | |
357 | .event_write = lttng_event_write, | |
3d1fc7fd | 358 | }, |
74d81a6c | 359 | .client_config = &client_config, |
3d1fc7fd MD |
360 | }; |
361 | ||
edaa1431 | 362 | void RING_BUFFER_MODE_TEMPLATE_INIT(void) |
3d1fc7fd | 363 | { |
34a91bdb MD |
364 | DBG("LTT : ltt ring buffer client \"%s\" init\n", |
365 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 366 | lttng_transport_register(<tng_relay_transport); |
3d1fc7fd MD |
367 | } |
368 | ||
edaa1431 | 369 | void RING_BUFFER_MODE_TEMPLATE_EXIT(void) |
3d1fc7fd | 370 | { |
34a91bdb MD |
371 | DBG("LTT : ltt ring buffer client \"%s\" exit\n", |
372 | "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap"); | |
7dd08bec | 373 | lttng_transport_unregister(<tng_relay_transport); |
3d1fc7fd | 374 | } |