Commit | Line | Data |
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3d1fc7fd MD |
1 | /* |
2 | * ltt-ring-buffer-client.h | |
3 | * | |
4 | * Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * LTTng lib ring buffer client template. | |
7 | * | |
8 | * Dual LGPL v2.1/GPL v2 license. | |
9 | */ | |
10 | ||
9f3fdbc6 | 11 | #include <stdint.h> |
f4681817 | 12 | #include <ust/lttng-events.h> |
9f3fdbc6 | 13 | #include "ust/bitfield.h" |
3d1fc7fd | 14 | #include "ltt-tracer.h" |
9f3fdbc6 | 15 | #include "../libringbuffer/frontend_types.h" |
3d1fc7fd MD |
16 | |
17 | struct metadata_packet_header { | |
18 | uint32_t magic; /* 0x75D11D57 */ | |
19 | uint8_t uuid[16]; /* Unique Universal Identifier */ | |
20 | uint32_t checksum; /* 0 if unused */ | |
21 | uint32_t content_size; /* in bits */ | |
22 | uint32_t packet_size; /* in bits */ | |
23 | uint8_t compression_scheme; /* 0 if unused */ | |
24 | uint8_t encryption_scheme; /* 0 if unused */ | |
25 | uint8_t checksum_scheme; /* 0 if unused */ | |
8a98a75d MD |
26 | uint8_t major; /* CTF spec major version number */ |
27 | uint8_t minor; /* CTF spec minor version number */ | |
3d1fc7fd MD |
28 | uint8_t header_end[0]; |
29 | }; | |
30 | ||
31 | struct metadata_record_header { | |
32 | uint8_t header_end[0]; /* End of header */ | |
33 | }; | |
34 | ||
4cfec15c | 35 | static const struct lttng_ust_lib_ring_buffer_config client_config; |
3d1fc7fd MD |
36 | |
37 | static inline | |
38 | u64 lib_ring_buffer_clock_read(struct channel *chan) | |
39 | { | |
40 | return 0; | |
41 | } | |
42 | ||
43 | static inline | |
4cfec15c | 44 | unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, |
3d1fc7fd MD |
45 | struct channel *chan, size_t offset, |
46 | size_t *pre_header_padding, | |
4cfec15c | 47 | struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
48 | { |
49 | return 0; | |
50 | } | |
51 | ||
9f3fdbc6 | 52 | #include "../libringbuffer/api.h" |
3d1fc7fd MD |
53 | |
54 | static u64 client_ring_buffer_clock_read(struct channel *chan) | |
55 | { | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static | |
4cfec15c | 60 | size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, |
3d1fc7fd MD |
61 | struct channel *chan, size_t offset, |
62 | size_t *pre_header_padding, | |
4cfec15c | 63 | struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
64 | { |
65 | return 0; | |
66 | } | |
67 | ||
68 | /** | |
69 | * client_packet_header_size - called on buffer-switch to a new sub-buffer | |
70 | * | |
71 | * Return header size without padding after the structure. Don't use packed | |
72 | * structure because gcc generates inefficient code on some architectures | |
73 | * (powerpc, mips..) | |
74 | */ | |
75 | static size_t client_packet_header_size(void) | |
76 | { | |
77 | return offsetof(struct metadata_packet_header, header_end); | |
78 | } | |
79 | ||
4cfec15c | 80 | static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, u64 tsc, |
1d498196 | 81 | unsigned int subbuf_idx, |
38fae1d3 | 82 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 83 | { |
1d498196 | 84 | struct channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
85 | struct metadata_packet_header *header = |
86 | (struct metadata_packet_header *) | |
87 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
88 | subbuf_idx * chan->backend.subbuf_size, |
89 | handle); | |
3d1fc7fd MD |
90 | struct ltt_channel *ltt_chan = channel_get_private(chan); |
91 | struct ltt_session *session = ltt_chan->session; | |
92 | ||
93 | header->magic = TSDL_MAGIC_NUMBER; | |
9f3fdbc6 | 94 | memcpy(header->uuid, session->uuid, sizeof(session->uuid)); |
3d1fc7fd MD |
95 | header->checksum = 0; /* 0 if unused */ |
96 | header->content_size = 0xFFFFFFFF; /* in bits, for debugging */ | |
97 | header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */ | |
98 | header->compression_scheme = 0; /* 0 if unused */ | |
99 | header->encryption_scheme = 0; /* 0 if unused */ | |
100 | header->checksum_scheme = 0; /* 0 if unused */ | |
8a98a75d MD |
101 | header->major = CTF_SPEC_MAJOR; |
102 | header->minor = CTF_SPEC_MINOR; | |
103 | ||
3d1fc7fd MD |
104 | } |
105 | ||
106 | /* | |
107 | * offset is assumed to never be 0 here : never deliver a completely empty | |
108 | * subbuffer. data_size is between 1 and subbuf_size. | |
109 | */ | |
4cfec15c | 110 | static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, u64 tsc, |
1d498196 | 111 | unsigned int subbuf_idx, unsigned long data_size, |
38fae1d3 | 112 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 113 | { |
1d498196 | 114 | struct channel *chan = shmp(handle, buf->backend.chan); |
3d1fc7fd MD |
115 | struct metadata_packet_header *header = |
116 | (struct metadata_packet_header *) | |
117 | lib_ring_buffer_offset_address(&buf->backend, | |
1d498196 MD |
118 | subbuf_idx * chan->backend.subbuf_size, |
119 | handle); | |
3d1fc7fd MD |
120 | unsigned long records_lost = 0; |
121 | ||
122 | header->content_size = data_size * CHAR_BIT; /* in bits */ | |
123 | header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */ | |
124 | records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf); | |
125 | records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf); | |
126 | records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf); | |
127 | WARN_ON_ONCE(records_lost != 0); | |
128 | } | |
129 | ||
4cfec15c | 130 | static int client_buffer_create(struct lttng_ust_lib_ring_buffer *buf, void *priv, |
1d498196 | 131 | int cpu, const char *name, |
38fae1d3 | 132 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
133 | { |
134 | return 0; | |
135 | } | |
136 | ||
4cfec15c | 137 | static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf, |
1d498196 | 138 | void *priv, int cpu, |
38fae1d3 | 139 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
140 | { |
141 | } | |
142 | ||
4cfec15c | 143 | static const struct lttng_ust_lib_ring_buffer_config client_config = { |
3d1fc7fd MD |
144 | .cb.ring_buffer_clock_read = client_ring_buffer_clock_read, |
145 | .cb.record_header_size = client_record_header_size, | |
146 | .cb.subbuffer_header_size = client_packet_header_size, | |
147 | .cb.buffer_begin = client_buffer_begin, | |
148 | .cb.buffer_end = client_buffer_end, | |
149 | .cb.buffer_create = client_buffer_create, | |
150 | .cb.buffer_finalize = client_buffer_finalize, | |
151 | ||
152 | .tsc_bits = 0, | |
153 | .alloc = RING_BUFFER_ALLOC_GLOBAL, | |
154 | .sync = RING_BUFFER_SYNC_GLOBAL, | |
155 | .mode = RING_BUFFER_MODE_TEMPLATE, | |
156 | .backend = RING_BUFFER_PAGE, | |
5d61a504 | 157 | .output = RING_BUFFER_MMAP, |
3d1fc7fd | 158 | .oops = RING_BUFFER_OOPS_CONSISTENCY, |
5d61a504 MD |
159 | .ipi = RING_BUFFER_NO_IPI_BARRIER, |
160 | .wakeup = RING_BUFFER_WAKEUP_BY_WRITER, | |
3d1fc7fd MD |
161 | }; |
162 | ||
163 | static | |
1d498196 | 164 | struct ltt_channel *_channel_create(const char *name, |
3d1fc7fd MD |
165 | struct ltt_channel *ltt_chan, void *buf_addr, |
166 | size_t subbuf_size, size_t num_subbuf, | |
167 | unsigned int switch_timer_interval, | |
193183fb MD |
168 | unsigned int read_timer_interval, |
169 | int *shm_fd, int *wait_fd, | |
170 | uint64_t *memory_map_size) | |
3d1fc7fd | 171 | { |
1d498196 | 172 | ltt_chan->handle = channel_create(&client_config, name, ltt_chan, buf_addr, |
3d1fc7fd | 173 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb MD |
174 | read_timer_interval, shm_fd, wait_fd, |
175 | memory_map_size); | |
1b2c2540 MD |
176 | if (!ltt_chan->handle) |
177 | return NULL; | |
178 | ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan); | |
1d498196 | 179 | return ltt_chan; |
3d1fc7fd MD |
180 | } |
181 | ||
182 | static | |
1d498196 | 183 | void ltt_channel_destroy(struct ltt_channel *ltt_chan) |
3d1fc7fd | 184 | { |
824f40b8 | 185 | channel_destroy(ltt_chan->chan, ltt_chan->handle, 0); |
3d1fc7fd MD |
186 | } |
187 | ||
188 | static | |
4cfec15c | 189 | struct lttng_ust_lib_ring_buffer *ltt_buffer_read_open(struct channel *chan, |
38fae1d3 | 190 | struct lttng_ust_shm_handle *handle, |
381c0f1e MD |
191 | int *shm_fd, int *wait_fd, |
192 | uint64_t *memory_map_size) | |
3d1fc7fd | 193 | { |
4cfec15c | 194 | struct lttng_ust_lib_ring_buffer *buf; |
3d1fc7fd | 195 | |
381c0f1e MD |
196 | buf = channel_get_ring_buffer(&client_config, chan, |
197 | 0, handle, shm_fd, wait_fd, memory_map_size); | |
824f40b8 | 198 | if (!lib_ring_buffer_open_read(buf, handle, 0)) |
3d1fc7fd MD |
199 | return buf; |
200 | return NULL; | |
201 | } | |
202 | ||
203 | static | |
4cfec15c | 204 | void ltt_buffer_read_close(struct lttng_ust_lib_ring_buffer *buf, |
38fae1d3 | 205 | struct lttng_ust_shm_handle *handle) |
3d1fc7fd | 206 | { |
824f40b8 | 207 | lib_ring_buffer_release_read(buf, handle, 0); |
3d1fc7fd MD |
208 | } |
209 | ||
210 | static | |
4cfec15c | 211 | int ltt_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id) |
3d1fc7fd MD |
212 | { |
213 | return lib_ring_buffer_reserve(&client_config, ctx); | |
214 | } | |
215 | ||
216 | static | |
4cfec15c | 217 | void ltt_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx) |
3d1fc7fd MD |
218 | { |
219 | lib_ring_buffer_commit(&client_config, ctx); | |
220 | } | |
221 | ||
222 | static | |
4cfec15c | 223 | void ltt_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src, |
3d1fc7fd MD |
224 | size_t len) |
225 | { | |
226 | lib_ring_buffer_write(&client_config, ctx, src, len); | |
227 | } | |
228 | ||
229 | static | |
38fae1d3 | 230 | size_t ltt_packet_avail_size(struct channel *chan, struct lttng_ust_shm_handle *handle) |
3d1fc7fd MD |
231 | |
232 | { | |
233 | unsigned long o_begin; | |
4cfec15c | 234 | struct lttng_ust_lib_ring_buffer *buf; |
3d1fc7fd | 235 | |
1d498196 | 236 | buf = shmp(handle, chan->backend.buf[0].shmp); /* Only for global buffer ! */ |
3d1fc7fd MD |
237 | o_begin = v_read(&client_config, &buf->offset); |
238 | if (subbuf_offset(o_begin, chan) != 0) { | |
239 | return chan->backend.subbuf_size - subbuf_offset(o_begin, chan); | |
240 | } else { | |
241 | return chan->backend.subbuf_size - subbuf_offset(o_begin, chan) | |
242 | - sizeof(struct metadata_packet_header); | |
243 | } | |
244 | } | |
245 | ||
9f3fdbc6 | 246 | #if 0 |
3d1fc7fd MD |
247 | static |
248 | wait_queue_head_t *ltt_get_reader_wait_queue(struct channel *chan) | |
249 | { | |
250 | return &chan->read_wait; | |
251 | } | |
252 | ||
253 | static | |
254 | wait_queue_head_t *ltt_get_hp_wait_queue(struct channel *chan) | |
255 | { | |
256 | return &chan->hp_wait; | |
257 | } | |
9f3fdbc6 | 258 | #endif //0 |
3d1fc7fd MD |
259 | |
260 | static | |
261 | int ltt_is_finalized(struct channel *chan) | |
262 | { | |
263 | return lib_ring_buffer_channel_is_finalized(chan); | |
264 | } | |
265 | ||
266 | static | |
267 | int ltt_is_disabled(struct channel *chan) | |
268 | { | |
269 | return lib_ring_buffer_channel_is_disabled(chan); | |
270 | } | |
271 | ||
43861eab | 272 | static |
38fae1d3 | 273 | int ltt_flush_buffer(struct channel *chan, struct lttng_ust_shm_handle *handle) |
43861eab | 274 | { |
4cfec15c | 275 | struct lttng_ust_lib_ring_buffer *buf; |
43861eab MD |
276 | int shm_fd, wait_fd; |
277 | uint64_t memory_map_size; | |
278 | ||
279 | buf = channel_get_ring_buffer(&client_config, chan, | |
280 | 0, handle, &shm_fd, &wait_fd, | |
281 | &memory_map_size); | |
282 | lib_ring_buffer_switch(&client_config, buf, | |
283 | SWITCH_ACTIVE, handle); | |
284 | return 0; | |
285 | } | |
286 | ||
3d1fc7fd | 287 | static struct ltt_transport ltt_relay_transport = { |
818173b9 | 288 | .name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap", |
3d1fc7fd MD |
289 | .ops = { |
290 | .channel_create = _channel_create, | |
291 | .channel_destroy = ltt_channel_destroy, | |
292 | .buffer_read_open = ltt_buffer_read_open, | |
293 | .buffer_read_close = ltt_buffer_read_close, | |
294 | .event_reserve = ltt_event_reserve, | |
295 | .event_commit = ltt_event_commit, | |
296 | .event_write = ltt_event_write, | |
297 | .packet_avail_size = ltt_packet_avail_size, | |
9f3fdbc6 MD |
298 | //.get_reader_wait_queue = ltt_get_reader_wait_queue, |
299 | //.get_hp_wait_queue = ltt_get_hp_wait_queue, | |
3d1fc7fd MD |
300 | .is_finalized = ltt_is_finalized, |
301 | .is_disabled = ltt_is_disabled, | |
43d330a4 | 302 | .flush_buffer = ltt_flush_buffer, |
3d1fc7fd MD |
303 | }, |
304 | }; | |
305 | ||
edaa1431 | 306 | void RING_BUFFER_MODE_TEMPLATE_INIT(void) |
3d1fc7fd | 307 | { |
18c1cd87 | 308 | DBG("LTT : ltt ring buffer client init\n"); |
3d1fc7fd | 309 | ltt_transport_register(<t_relay_transport); |
3d1fc7fd MD |
310 | } |
311 | ||
edaa1431 | 312 | void RING_BUFFER_MODE_TEMPLATE_EXIT(void) |
3d1fc7fd | 313 | { |
18c1cd87 | 314 | DBG("LTT : ltt ring buffer client exit\n"); |
3d1fc7fd MD |
315 | ltt_transport_unregister(<t_relay_transport); |
316 | } |