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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; | |
85 | memcpy(old_channel.padding, chops->padding, sizeof(old_channel.padding)); | |
86 | ||
87 | return ioctl(fd, LTTNG_KERNEL_OLD_METADATA, &old_channel); | |
88 | } | |
89 | ||
90 | channel.overwrite = chops->overwrite; | |
91 | channel.subbuf_size = chops->subbuf_size; | |
92 | channel.num_subbuf = chops->num_subbuf; | |
93 | channel.switch_timer_interval = chops->switch_timer_interval; | |
94 | channel.read_timer_interval = chops->read_timer_interval; | |
95 | channel.output = chops->output; | |
96 | memcpy(channel.padding, chops->padding, sizeof(channel.padding)); | |
97 | ||
98 | return ioctl(fd, LTTNG_KERNEL_METADATA, &channel); | |
f3ed775e DG |
99 | } |
100 | ||
101 | int kernctl_create_channel(int fd, struct lttng_channel_attr *chops) | |
16421f6e | 102 | { |
4dbc372b JD |
103 | struct lttng_kernel_channel channel; |
104 | ||
105 | if (lttng_kernel_use_old_abi) { | |
106 | struct lttng_kernel_old_channel old_channel; | |
107 | ||
108 | old_channel.overwrite = chops->overwrite; | |
109 | old_channel.subbuf_size = chops->subbuf_size; | |
110 | old_channel.num_subbuf = chops->num_subbuf; | |
111 | old_channel.switch_timer_interval = chops->switch_timer_interval; | |
112 | old_channel.read_timer_interval = chops->read_timer_interval; | |
113 | old_channel.output = chops->output; | |
114 | memcpy(old_channel.padding, chops->padding, sizeof(old_channel.padding)); | |
115 | ||
116 | return ioctl(fd, LTTNG_KERNEL_OLD_CHANNEL, &old_channel); | |
117 | } | |
118 | ||
119 | channel.overwrite = chops->overwrite; | |
120 | channel.subbuf_size = chops->subbuf_size; | |
121 | channel.num_subbuf = chops->num_subbuf; | |
122 | channel.switch_timer_interval = chops->switch_timer_interval; | |
123 | channel.read_timer_interval = chops->read_timer_interval; | |
124 | channel.output = chops->output; | |
125 | memcpy(channel.padding, chops->padding, sizeof(channel.padding)); | |
126 | ||
127 | return ioctl(fd, LTTNG_KERNEL_CHANNEL, &channel); | |
16421f6e DG |
128 | } |
129 | ||
964ccb60 | 130 | int kernctl_create_stream(int fd) |
16421f6e | 131 | { |
4dbc372b JD |
132 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM, |
133 | LTTNG_KERNEL_STREAM); | |
16421f6e DG |
134 | } |
135 | ||
964ccb60 | 136 | int kernctl_create_event(int fd, struct lttng_kernel_event *ev) |
16421f6e | 137 | { |
4dbc372b JD |
138 | if (lttng_kernel_use_old_abi) { |
139 | struct lttng_kernel_old_event old_event; | |
140 | ||
141 | memcpy(old_event.name, ev->name, sizeof(old_event.name)); | |
142 | old_event.instrumentation = ev->instrumentation; | |
143 | switch (ev->instrumentation) { | |
144 | case LTTNG_KERNEL_KPROBE: | |
145 | old_event.u.kprobe.addr = ev->u.kprobe.addr; | |
146 | old_event.u.kprobe.offset = ev->u.kprobe.offset; | |
147 | memcpy(old_event.u.kprobe.symbol_name, | |
148 | ev->u.kprobe.symbol_name, | |
149 | sizeof(old_event.u.kprobe.symbol_name)); | |
150 | break; | |
151 | case LTTNG_KERNEL_KRETPROBE: | |
152 | old_event.u.kretprobe.addr = ev->u.kretprobe.addr; | |
153 | old_event.u.kretprobe.offset = ev->u.kretprobe.offset; | |
154 | memcpy(old_event.u.kretprobe.symbol_name, | |
155 | ev->u.kretprobe.symbol_name, | |
156 | sizeof(old_event.u.kretprobe.symbol_name)); | |
157 | break; | |
158 | case LTTNG_KERNEL_FUNCTION: | |
159 | memcpy(old_event.u.ftrace.symbol_name, | |
160 | ev->u.ftrace.symbol_name, | |
161 | sizeof(old_event.u.ftrace.symbol_name)); | |
162 | break; | |
163 | default: | |
164 | break; | |
165 | } | |
166 | ||
167 | return ioctl(fd, LTTNG_KERNEL_OLD_EVENT, &old_event); | |
168 | } | |
964ccb60 | 169 | return ioctl(fd, LTTNG_KERNEL_EVENT, ev); |
16421f6e DG |
170 | } |
171 | ||
964ccb60 | 172 | int kernctl_add_context(int fd, struct lttng_kernel_context *ctx) |
16421f6e | 173 | { |
4dbc372b JD |
174 | if (lttng_kernel_use_old_abi) { |
175 | struct lttng_kernel_old_context old_ctx; | |
176 | ||
177 | old_ctx.ctx = ctx->ctx; | |
178 | /* only type that uses the union */ | |
179 | if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
180 | old_ctx.u.perf_counter.type = | |
181 | ctx->u.perf_counter.type; | |
182 | old_ctx.u.perf_counter.config = | |
183 | ctx->u.perf_counter.config; | |
184 | memcpy(old_ctx.u.perf_counter.name, | |
185 | ctx->u.perf_counter.name, | |
186 | sizeof(old_ctx.u.perf_counter.name)); | |
187 | } | |
188 | return ioctl(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx); | |
189 | } | |
964ccb60 | 190 | return ioctl(fd, LTTNG_KERNEL_CONTEXT, ctx); |
16421f6e DG |
191 | } |
192 | ||
964ccb60 | 193 | |
f3ed775e DG |
194 | /* Enable event, channel and session ioctl */ |
195 | int kernctl_enable(int fd) | |
196 | { | |
4dbc372b JD |
197 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE, |
198 | LTTNG_KERNEL_ENABLE); | |
f3ed775e DG |
199 | } |
200 | ||
201 | /* Disable event, channel and session ioctl */ | |
202 | int kernctl_disable(int fd) | |
203 | { | |
4dbc372b JD |
204 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE, |
205 | LTTNG_KERNEL_DISABLE); | |
f3ed775e DG |
206 | } |
207 | ||
964ccb60 | 208 | int kernctl_start_session(int fd) |
16421f6e | 209 | { |
4dbc372b JD |
210 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START, |
211 | LTTNG_KERNEL_SESSION_START); | |
964ccb60 MD |
212 | } |
213 | ||
214 | int kernctl_stop_session(int fd) | |
215 | { | |
4dbc372b JD |
216 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP, |
217 | LTTNG_KERNEL_SESSION_STOP); | |
16421f6e DG |
218 | } |
219 | ||
964ccb60 MD |
220 | int kernctl_tracepoint_list(int fd) |
221 | { | |
4dbc372b JD |
222 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST, |
223 | LTTNG_KERNEL_TRACEPOINT_LIST); | |
964ccb60 MD |
224 | } |
225 | ||
226 | int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v) | |
227 | { | |
4dbc372b JD |
228 | int ret; |
229 | ||
230 | if (lttng_kernel_use_old_abi == -1) { | |
231 | ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v); | |
232 | if (!ret) { | |
233 | lttng_kernel_use_old_abi = 0; | |
234 | goto end; | |
235 | } | |
236 | lttng_kernel_use_old_abi = 1; | |
237 | } | |
238 | if (lttng_kernel_use_old_abi) { | |
239 | struct lttng_kernel_old_tracer_version old_v; | |
240 | ||
241 | ret = ioctl(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v); | |
242 | if (ret) { | |
243 | goto end; | |
244 | } | |
245 | v->major = old_v.major; | |
246 | v->minor = old_v.minor; | |
247 | v->patchlevel = old_v.patchlevel; | |
248 | } else { | |
249 | ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v); | |
250 | } | |
251 | ||
252 | end: | |
253 | return ret; | |
964ccb60 MD |
254 | } |
255 | ||
256 | int kernctl_wait_quiescent(int fd) | |
257 | { | |
4dbc372b JD |
258 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT, |
259 | LTTNG_KERNEL_WAIT_QUIESCENT); | |
964ccb60 MD |
260 | } |
261 | ||
262 | int kernctl_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
263 | { | |
4dbc372b JD |
264 | int ret; |
265 | ||
266 | if (lttng_kernel_use_old_abi == -1) { | |
267 | ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate); | |
268 | if (!ret) { | |
269 | lttng_kernel_use_old_abi = 0; | |
270 | goto end; | |
271 | } | |
272 | lttng_kernel_use_old_abi = 1; | |
273 | } | |
274 | if (lttng_kernel_use_old_abi) { | |
275 | struct lttng_kernel_old_calibrate old_calibrate; | |
276 | ||
277 | old_calibrate.type = calibrate->type; | |
278 | ret = ioctl(fd, LTTNG_KERNEL_OLD_CALIBRATE, &old_calibrate); | |
279 | if (ret) { | |
280 | goto end; | |
281 | } | |
282 | calibrate->type = old_calibrate.type; | |
283 | } else { | |
284 | ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate); | |
285 | } | |
286 | ||
287 | end: | |
288 | return ret; | |
964ccb60 MD |
289 | } |
290 | ||
291 | ||
292 | int kernctl_buffer_flush(int fd) | |
293 | { | |
294 | return ioctl(fd, RING_BUFFER_FLUSH); | |
295 | } | |
296 | ||
297 | ||
298 | /* Buffer operations */ | |
299 | ||
300 | /* For mmap mode, readable without "get" operation */ | |
301 | ||
16421f6e DG |
302 | /* returns the length to mmap. */ |
303 | int kernctl_get_mmap_len(int fd, unsigned long *len) | |
304 | { | |
305 | return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len); | |
306 | } | |
307 | ||
964ccb60 MD |
308 | /* returns the maximum size for sub-buffers. */ |
309 | int kernctl_get_max_subbuf_size(int fd, unsigned long *len) | |
310 | { | |
311 | return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len); | |
312 | } | |
313 | ||
314 | /* | |
315 | * For mmap mode, operate on the current packet (between get/put or | |
316 | * get_next/put_next). | |
317 | */ | |
318 | ||
16421f6e DG |
319 | /* returns the offset of the subbuffer belonging to the mmap reader. */ |
320 | int kernctl_get_mmap_read_offset(int fd, unsigned long *off) | |
321 | { | |
322 | return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off); | |
323 | } | |
324 | ||
964ccb60 MD |
325 | /* returns the size of the current sub-buffer, without padding (for mmap). */ |
326 | int kernctl_get_subbuf_size(int fd, unsigned long *len) | |
16421f6e | 327 | { |
964ccb60 | 328 | return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len); |
16421f6e DG |
329 | } |
330 | ||
331 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
332 | int kernctl_get_padded_subbuf_size(int fd, unsigned long *len) | |
333 | { | |
334 | return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len); | |
335 | } | |
336 | ||
964ccb60 MD |
337 | /* Get exclusive read access to the next sub-buffer that can be read. */ |
338 | int kernctl_get_next_subbuf(int fd) | |
16421f6e | 339 | { |
964ccb60 | 340 | return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF); |
16421f6e DG |
341 | } |
342 | ||
d4a1283e | 343 | |
16421f6e DG |
344 | /* Release exclusive sub-buffer access, move consumer forward. */ |
345 | int kernctl_put_next_subbuf(int fd) | |
346 | { | |
347 | return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF); | |
348 | } | |
349 | ||
964ccb60 | 350 | /* snapshot */ |
16421f6e DG |
351 | |
352 | /* Get a snapshot of the current ring buffer producer and consumer positions */ | |
353 | int kernctl_snapshot(int fd) | |
354 | { | |
355 | return ioctl(fd, RING_BUFFER_SNAPSHOT); | |
356 | } | |
357 | ||
358 | /* Get the consumer position (iteration start) */ | |
359 | int kernctl_snapshot_get_consumed(int fd, unsigned long *pos) | |
360 | { | |
361 | return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos); | |
362 | } | |
363 | ||
364 | /* Get the producer position (iteration end) */ | |
365 | int kernctl_snapshot_get_produced(int fd, unsigned long *pos) | |
366 | { | |
367 | return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos); | |
368 | } | |
369 | ||
964ccb60 MD |
370 | /* Get exclusive read access to the specified sub-buffer position */ |
371 | int kernctl_get_subbuf(int fd, unsigned long *len) | |
f3ed775e | 372 | { |
964ccb60 | 373 | return ioctl(fd, RING_BUFFER_GET_SUBBUF, len); |
f3ed775e | 374 | } |
d0254c7c | 375 | |
964ccb60 MD |
376 | /* Release exclusive sub-buffer access */ |
377 | int kernctl_put_subbuf(int fd) | |
d0254c7c | 378 | { |
964ccb60 | 379 | return ioctl(fd, RING_BUFFER_PUT_SUBBUF); |
d0254c7c | 380 | } |