Commit | Line | Data |
---|---|---|
ee0326c0 | 1 | /* |
16421f6e DG |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
ee0326c0 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
ee0326c0 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
ee0326c0 | 17 | */ |
16421f6e | 18 | |
95ba0f2f | 19 | #define __USE_LINUX_IOCTL_DEFS |
16421f6e | 20 | #include <sys/ioctl.h> |
4dbc372b | 21 | #include <string.h> |
16421f6e | 22 | |
10a8a223 | 23 | #include "kernel-ctl.h" |
16421f6e | 24 | #include "kernel-ioctl.h" |
16421f6e | 25 | |
4dbc372b JD |
26 | /* |
27 | * This flag indicates which version of the kernel ABI to use. The old | |
28 | * ABI (namespace _old) does not support a 32-bit user-space when the | |
29 | * kernel is 64-bit. The old ABI is kept here for compatibility but is | |
30 | * deprecated and will be removed eventually. | |
31 | */ | |
32 | static int lttng_kernel_use_old_abi = -1; | |
33 | ||
34 | /* | |
35 | * Execute the new or old ioctl depending on the ABI version. | |
36 | * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1), | |
37 | * this function tests if the new ABI is available and otherwise fallbacks | |
38 | * on the old one. | |
39 | * This function takes the fd on which the ioctl must be executed and the old | |
40 | * and new request codes. | |
41 | * It returns the return value of the ioctl executed. | |
42 | */ | |
43 | static inline int compat_ioctl_no_arg(int fd, unsigned long oldname, | |
44 | unsigned long newname) | |
45 | { | |
46 | int ret; | |
47 | ||
48 | if (lttng_kernel_use_old_abi == -1) { | |
49 | ret = ioctl(fd, newname); | |
50 | if (!ret) { | |
51 | lttng_kernel_use_old_abi = 0; | |
52 | goto end; | |
53 | } | |
54 | lttng_kernel_use_old_abi = 1; | |
55 | } | |
56 | if (lttng_kernel_use_old_abi) { | |
57 | ret = ioctl(fd, oldname); | |
58 | } else { | |
59 | ret = ioctl(fd, newname); | |
60 | } | |
61 | ||
62 | end: | |
63 | return ret; | |
64 | } | |
65 | ||
964ccb60 | 66 | int kernctl_create_session(int fd) |
d65106b1 | 67 | { |
4dbc372b JD |
68 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION, |
69 | LTTNG_KERNEL_SESSION); | |
d65106b1 DG |
70 | } |
71 | ||
964ccb60 MD |
72 | /* open the metadata global channel */ |
73 | int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops) | |
f3ed775e | 74 | { |
4dbc372b JD |
75 | struct lttng_kernel_old_channel old_channel; |
76 | struct lttng_kernel_channel channel; | |
77 | ||
78 | if (lttng_kernel_use_old_abi) { | |
79 | old_channel.overwrite = chops->overwrite; | |
80 | old_channel.subbuf_size = chops->subbuf_size; | |
81 | old_channel.num_subbuf = chops->num_subbuf; | |
82 | old_channel.switch_timer_interval = chops->switch_timer_interval; | |
83 | old_channel.read_timer_interval = chops->read_timer_interval; | |
84 | old_channel.output = chops->output; | |
f853c53a DG |
85 | |
86 | memset(old_channel.padding, 0, sizeof(old_channel.padding)); | |
87 | /* | |
88 | * The new channel padding is smaller than the old ABI so we use the | |
89 | * new ABI padding size for the memcpy. | |
90 | */ | |
91 | memcpy(old_channel.padding, chops->padding, sizeof(chops->padding)); | |
4dbc372b JD |
92 | |
93 | return ioctl(fd, LTTNG_KERNEL_OLD_METADATA, &old_channel); | |
94 | } | |
95 | ||
96 | channel.overwrite = chops->overwrite; | |
97 | channel.subbuf_size = chops->subbuf_size; | |
98 | channel.num_subbuf = chops->num_subbuf; | |
99 | channel.switch_timer_interval = chops->switch_timer_interval; | |
100 | channel.read_timer_interval = chops->read_timer_interval; | |
101 | channel.output = chops->output; | |
ea207e3b | 102 | memcpy(channel.padding, chops->padding, sizeof(chops->padding)); |
4dbc372b JD |
103 | |
104 | return ioctl(fd, LTTNG_KERNEL_METADATA, &channel); | |
f3ed775e DG |
105 | } |
106 | ||
107 | int kernctl_create_channel(int fd, struct lttng_channel_attr *chops) | |
16421f6e | 108 | { |
4dbc372b JD |
109 | struct lttng_kernel_channel channel; |
110 | ||
111 | if (lttng_kernel_use_old_abi) { | |
112 | struct lttng_kernel_old_channel old_channel; | |
113 | ||
114 | old_channel.overwrite = chops->overwrite; | |
115 | old_channel.subbuf_size = chops->subbuf_size; | |
116 | old_channel.num_subbuf = chops->num_subbuf; | |
117 | old_channel.switch_timer_interval = chops->switch_timer_interval; | |
118 | old_channel.read_timer_interval = chops->read_timer_interval; | |
119 | old_channel.output = chops->output; | |
f853c53a DG |
120 | |
121 | memset(old_channel.padding, 0, sizeof(old_channel.padding)); | |
122 | /* | |
123 | * The new channel padding is smaller than the old ABI so we use the | |
124 | * new ABI padding size for the memcpy. | |
125 | */ | |
126 | memcpy(old_channel.padding, chops->padding, sizeof(chops->padding)); | |
4dbc372b JD |
127 | |
128 | return ioctl(fd, LTTNG_KERNEL_OLD_CHANNEL, &old_channel); | |
129 | } | |
130 | ||
131 | channel.overwrite = chops->overwrite; | |
132 | channel.subbuf_size = chops->subbuf_size; | |
133 | channel.num_subbuf = chops->num_subbuf; | |
134 | channel.switch_timer_interval = chops->switch_timer_interval; | |
135 | channel.read_timer_interval = chops->read_timer_interval; | |
136 | channel.output = chops->output; | |
ea207e3b | 137 | memcpy(channel.padding, chops->padding, sizeof(chops->padding)); |
4dbc372b JD |
138 | |
139 | return ioctl(fd, LTTNG_KERNEL_CHANNEL, &channel); | |
16421f6e DG |
140 | } |
141 | ||
6e911cad MD |
142 | int kernctl_enable_syscall(int fd, const char *syscall_name) |
143 | { | |
144 | struct lttng_kernel_event event; | |
145 | ||
146 | memset(&event, 0, sizeof(event)); | |
147 | strncpy(event.name, syscall_name, sizeof(event.name)); | |
148 | event.name[sizeof(event.name) - 1] = '\0'; | |
149 | event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
150 | event.u.syscall.disable = 0; | |
151 | return ioctl(fd, LTTNG_KERNEL_EVENT, &event); | |
152 | } | |
153 | ||
154 | int kernctl_disable_syscall(int fd, const char *syscall_name) | |
155 | { | |
156 | struct lttng_kernel_event event; | |
157 | ||
158 | memset(&event, 0, sizeof(event)); | |
159 | strncpy(event.name, syscall_name, sizeof(event.name)); | |
160 | event.name[sizeof(event.name) - 1] = '\0'; | |
161 | event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
162 | event.u.syscall.disable = 1; | |
163 | return ioctl(fd, LTTNG_KERNEL_EVENT, &event); | |
164 | } | |
165 | ||
964ccb60 | 166 | int kernctl_create_stream(int fd) |
16421f6e | 167 | { |
4dbc372b JD |
168 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM, |
169 | LTTNG_KERNEL_STREAM); | |
16421f6e DG |
170 | } |
171 | ||
964ccb60 | 172 | int kernctl_create_event(int fd, struct lttng_kernel_event *ev) |
16421f6e | 173 | { |
4dbc372b JD |
174 | if (lttng_kernel_use_old_abi) { |
175 | struct lttng_kernel_old_event old_event; | |
176 | ||
177 | memcpy(old_event.name, ev->name, sizeof(old_event.name)); | |
178 | old_event.instrumentation = ev->instrumentation; | |
179 | switch (ev->instrumentation) { | |
180 | case LTTNG_KERNEL_KPROBE: | |
181 | old_event.u.kprobe.addr = ev->u.kprobe.addr; | |
182 | old_event.u.kprobe.offset = ev->u.kprobe.offset; | |
183 | memcpy(old_event.u.kprobe.symbol_name, | |
184 | ev->u.kprobe.symbol_name, | |
185 | sizeof(old_event.u.kprobe.symbol_name)); | |
186 | break; | |
187 | case LTTNG_KERNEL_KRETPROBE: | |
188 | old_event.u.kretprobe.addr = ev->u.kretprobe.addr; | |
189 | old_event.u.kretprobe.offset = ev->u.kretprobe.offset; | |
190 | memcpy(old_event.u.kretprobe.symbol_name, | |
191 | ev->u.kretprobe.symbol_name, | |
192 | sizeof(old_event.u.kretprobe.symbol_name)); | |
193 | break; | |
194 | case LTTNG_KERNEL_FUNCTION: | |
195 | memcpy(old_event.u.ftrace.symbol_name, | |
196 | ev->u.ftrace.symbol_name, | |
197 | sizeof(old_event.u.ftrace.symbol_name)); | |
198 | break; | |
199 | default: | |
200 | break; | |
201 | } | |
202 | ||
203 | return ioctl(fd, LTTNG_KERNEL_OLD_EVENT, &old_event); | |
204 | } | |
964ccb60 | 205 | return ioctl(fd, LTTNG_KERNEL_EVENT, ev); |
16421f6e DG |
206 | } |
207 | ||
964ccb60 | 208 | int kernctl_add_context(int fd, struct lttng_kernel_context *ctx) |
16421f6e | 209 | { |
4dbc372b JD |
210 | if (lttng_kernel_use_old_abi) { |
211 | struct lttng_kernel_old_context old_ctx; | |
212 | ||
213 | old_ctx.ctx = ctx->ctx; | |
214 | /* only type that uses the union */ | |
aa3514e9 | 215 | if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) { |
4dbc372b JD |
216 | old_ctx.u.perf_counter.type = |
217 | ctx->u.perf_counter.type; | |
218 | old_ctx.u.perf_counter.config = | |
219 | ctx->u.perf_counter.config; | |
220 | memcpy(old_ctx.u.perf_counter.name, | |
221 | ctx->u.perf_counter.name, | |
222 | sizeof(old_ctx.u.perf_counter.name)); | |
223 | } | |
224 | return ioctl(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx); | |
225 | } | |
964ccb60 | 226 | return ioctl(fd, LTTNG_KERNEL_CONTEXT, ctx); |
16421f6e DG |
227 | } |
228 | ||
964ccb60 | 229 | |
f3ed775e DG |
230 | /* Enable event, channel and session ioctl */ |
231 | int kernctl_enable(int fd) | |
232 | { | |
4dbc372b JD |
233 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE, |
234 | LTTNG_KERNEL_ENABLE); | |
f3ed775e DG |
235 | } |
236 | ||
237 | /* Disable event, channel and session ioctl */ | |
238 | int kernctl_disable(int fd) | |
239 | { | |
4dbc372b JD |
240 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE, |
241 | LTTNG_KERNEL_DISABLE); | |
f3ed775e DG |
242 | } |
243 | ||
964ccb60 | 244 | int kernctl_start_session(int fd) |
16421f6e | 245 | { |
4dbc372b JD |
246 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START, |
247 | LTTNG_KERNEL_SESSION_START); | |
964ccb60 MD |
248 | } |
249 | ||
250 | int kernctl_stop_session(int fd) | |
251 | { | |
4dbc372b JD |
252 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP, |
253 | LTTNG_KERNEL_SESSION_STOP); | |
16421f6e DG |
254 | } |
255 | ||
964ccb60 MD |
256 | int kernctl_tracepoint_list(int fd) |
257 | { | |
4dbc372b JD |
258 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST, |
259 | LTTNG_KERNEL_TRACEPOINT_LIST); | |
964ccb60 MD |
260 | } |
261 | ||
d02666a9 MD |
262 | int kernctl_syscall_list(int fd) |
263 | { | |
264 | return ioctl(fd, LTTNG_KERNEL_SYSCALL_LIST); | |
265 | } | |
266 | ||
964ccb60 MD |
267 | int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v) |
268 | { | |
4dbc372b JD |
269 | int ret; |
270 | ||
271 | if (lttng_kernel_use_old_abi == -1) { | |
272 | ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v); | |
273 | if (!ret) { | |
274 | lttng_kernel_use_old_abi = 0; | |
275 | goto end; | |
276 | } | |
277 | lttng_kernel_use_old_abi = 1; | |
278 | } | |
279 | if (lttng_kernel_use_old_abi) { | |
280 | struct lttng_kernel_old_tracer_version old_v; | |
281 | ||
282 | ret = ioctl(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v); | |
283 | if (ret) { | |
284 | goto end; | |
285 | } | |
286 | v->major = old_v.major; | |
287 | v->minor = old_v.minor; | |
288 | v->patchlevel = old_v.patchlevel; | |
289 | } else { | |
290 | ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v); | |
291 | } | |
292 | ||
293 | end: | |
294 | return ret; | |
964ccb60 MD |
295 | } |
296 | ||
297 | int kernctl_wait_quiescent(int fd) | |
298 | { | |
4dbc372b JD |
299 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT, |
300 | LTTNG_KERNEL_WAIT_QUIESCENT); | |
964ccb60 MD |
301 | } |
302 | ||
303 | int kernctl_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
304 | { | |
4dbc372b JD |
305 | int ret; |
306 | ||
307 | if (lttng_kernel_use_old_abi == -1) { | |
308 | ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate); | |
309 | if (!ret) { | |
310 | lttng_kernel_use_old_abi = 0; | |
311 | goto end; | |
312 | } | |
313 | lttng_kernel_use_old_abi = 1; | |
314 | } | |
315 | if (lttng_kernel_use_old_abi) { | |
316 | struct lttng_kernel_old_calibrate old_calibrate; | |
317 | ||
318 | old_calibrate.type = calibrate->type; | |
319 | ret = ioctl(fd, LTTNG_KERNEL_OLD_CALIBRATE, &old_calibrate); | |
320 | if (ret) { | |
321 | goto end; | |
322 | } | |
323 | calibrate->type = old_calibrate.type; | |
324 | } else { | |
325 | ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate); | |
326 | } | |
327 | ||
328 | end: | |
329 | return ret; | |
964ccb60 MD |
330 | } |
331 | ||
332 | ||
333 | int kernctl_buffer_flush(int fd) | |
334 | { | |
335 | return ioctl(fd, RING_BUFFER_FLUSH); | |
336 | } | |
337 | ||
338 | ||
339 | /* Buffer operations */ | |
340 | ||
341 | /* For mmap mode, readable without "get" operation */ | |
342 | ||
16421f6e DG |
343 | /* returns the length to mmap. */ |
344 | int kernctl_get_mmap_len(int fd, unsigned long *len) | |
345 | { | |
346 | return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len); | |
347 | } | |
348 | ||
964ccb60 MD |
349 | /* returns the maximum size for sub-buffers. */ |
350 | int kernctl_get_max_subbuf_size(int fd, unsigned long *len) | |
351 | { | |
352 | return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len); | |
353 | } | |
354 | ||
355 | /* | |
356 | * For mmap mode, operate on the current packet (between get/put or | |
357 | * get_next/put_next). | |
358 | */ | |
359 | ||
16421f6e DG |
360 | /* returns the offset of the subbuffer belonging to the mmap reader. */ |
361 | int kernctl_get_mmap_read_offset(int fd, unsigned long *off) | |
362 | { | |
363 | return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off); | |
364 | } | |
365 | ||
964ccb60 MD |
366 | /* returns the size of the current sub-buffer, without padding (for mmap). */ |
367 | int kernctl_get_subbuf_size(int fd, unsigned long *len) | |
16421f6e | 368 | { |
964ccb60 | 369 | return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len); |
16421f6e DG |
370 | } |
371 | ||
372 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
373 | int kernctl_get_padded_subbuf_size(int fd, unsigned long *len) | |
374 | { | |
375 | return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len); | |
376 | } | |
377 | ||
964ccb60 MD |
378 | /* Get exclusive read access to the next sub-buffer that can be read. */ |
379 | int kernctl_get_next_subbuf(int fd) | |
16421f6e | 380 | { |
964ccb60 | 381 | return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF); |
16421f6e DG |
382 | } |
383 | ||
d4a1283e | 384 | |
16421f6e DG |
385 | /* Release exclusive sub-buffer access, move consumer forward. */ |
386 | int kernctl_put_next_subbuf(int fd) | |
387 | { | |
388 | return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF); | |
389 | } | |
390 | ||
964ccb60 | 391 | /* snapshot */ |
16421f6e DG |
392 | |
393 | /* Get a snapshot of the current ring buffer producer and consumer positions */ | |
394 | int kernctl_snapshot(int fd) | |
395 | { | |
396 | return ioctl(fd, RING_BUFFER_SNAPSHOT); | |
397 | } | |
398 | ||
399 | /* Get the consumer position (iteration start) */ | |
400 | int kernctl_snapshot_get_consumed(int fd, unsigned long *pos) | |
401 | { | |
402 | return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos); | |
403 | } | |
404 | ||
405 | /* Get the producer position (iteration end) */ | |
406 | int kernctl_snapshot_get_produced(int fd, unsigned long *pos) | |
407 | { | |
408 | return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos); | |
409 | } | |
410 | ||
964ccb60 MD |
411 | /* Get exclusive read access to the specified sub-buffer position */ |
412 | int kernctl_get_subbuf(int fd, unsigned long *len) | |
f3ed775e | 413 | { |
964ccb60 | 414 | return ioctl(fd, RING_BUFFER_GET_SUBBUF, len); |
f3ed775e | 415 | } |
d0254c7c | 416 | |
964ccb60 MD |
417 | /* Release exclusive sub-buffer access */ |
418 | int kernctl_put_subbuf(int fd) | |
d0254c7c | 419 | { |
964ccb60 | 420 | return ioctl(fd, RING_BUFFER_PUT_SUBBUF); |
d0254c7c | 421 | } |
309167d2 JD |
422 | |
423 | /* Returns the timestamp begin of the current sub-buffer. */ | |
424 | int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin) | |
425 | { | |
426 | return ioctl(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN, timestamp_begin); | |
427 | } | |
428 | ||
429 | /* Returns the timestamp end of the current sub-buffer. */ | |
430 | int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end) | |
431 | { | |
432 | return ioctl(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END, timestamp_end); | |
433 | } | |
434 | ||
435 | /* Returns the number of discarded events in the current sub-buffer. */ | |
436 | int kernctl_get_events_discarded(int fd, uint64_t *events_discarded) | |
437 | { | |
438 | return ioctl(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED, events_discarded); | |
439 | } | |
440 | ||
441 | /* Returns the content size in the current sub-buffer. */ | |
442 | int kernctl_get_content_size(int fd, uint64_t *content_size) | |
443 | { | |
444 | return ioctl(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE, content_size); | |
445 | } | |
446 | ||
447 | /* Returns the packet size in the current sub-buffer. */ | |
448 | int kernctl_get_packet_size(int fd, uint64_t *packet_size) | |
449 | { | |
450 | return ioctl(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE, packet_size); | |
451 | } | |
452 | ||
453 | /* Returns the stream id of the current sub-buffer. */ | |
454 | int kernctl_get_stream_id(int fd, uint64_t *stream_id) | |
455 | { | |
456 | return ioctl(fd, LTTNG_RING_BUFFER_GET_STREAM_ID, stream_id); | |
457 | } | |
d3e2ba59 JD |
458 | |
459 | /* Returns the current timestamp. */ | |
460 | int kernctl_get_current_timestamp(int fd, uint64_t *ts) | |
461 | { | |
462 | return ioctl(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP, ts); | |
463 | } |