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9dad1eb8 PMF |
1 | /* |
2 | * ltt/ltt-tracer.c | |
3 | * | |
4 | * (C) Copyright 2005-2008 - | |
5 | * Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) | |
6 | * | |
34e4b7db PMF |
7 | * This library is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with this library; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | * | |
9dad1eb8 PMF |
21 | * Tracing management internal kernel API. Trace buffer allocation/free, tracing |
22 | * start/stop. | |
23 | * | |
24 | * Author: | |
25 | * Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) | |
26 | * | |
27 | * Inspired from LTT : | |
28 | * Karim Yaghmour (karim@opersys.com) | |
29 | * Tom Zanussi (zanussi@us.ibm.com) | |
30 | * Bob Wisniewski (bob@watson.ibm.com) | |
31 | * And from K42 : | |
32 | * Bob Wisniewski (bob@watson.ibm.com) | |
33 | * | |
34 | * Changelog: | |
35 | * 22/09/06, Move to the marker/probes mechanism. | |
36 | * 19/10/05, Complete lockless mechanism. | |
37 | * 27/05/05, Modular redesign and rewrite. | |
38 | */ | |
39 | ||
b6bf28ec PMF |
40 | //ust// #include <linux/time.h> |
41 | //ust// #include <linux/ltt-tracer.h> | |
42 | //ust// #include <linux/module.h> | |
43 | //ust// #include <linux/string.h> | |
44 | //ust// #include <linux/slab.h> | |
45 | //ust// #include <linux/init.h> | |
46 | //ust// #include <linux/rcupdate.h> | |
47 | //ust// #include <linux/sched.h> | |
48 | //ust// #include <linux/bitops.h> | |
49 | //ust// #include <linux/fs.h> | |
50 | //ust// #include <linux/cpu.h> | |
51 | //ust// #include <linux/kref.h> | |
52 | //ust// #include <linux/delay.h> | |
53 | //ust// #include <linux/vmalloc.h> | |
54 | //ust// #include <asm/atomic.h> | |
b7ea1a1c | 55 | #include <urcu/rculist.h> |
4268fdcd | 56 | |
1ae7f074 | 57 | #include "kernelcompat.h" |
b6bf28ec PMF |
58 | #include "tracercore.h" |
59 | #include "tracer.h" | |
b6bf28ec PMF |
60 | #include "usterr.h" |
61 | ||
62 | //ust// static void async_wakeup(unsigned long data); | |
63 | //ust// | |
64 | //ust// static DEFINE_TIMER(ltt_async_wakeup_timer, async_wakeup, 0, 0); | |
9dad1eb8 PMF |
65 | |
66 | /* Default callbacks for modules */ | |
67 | notrace int ltt_filter_control_default(enum ltt_filter_control_msg msg, | |
68 | struct ltt_trace_struct *trace) | |
69 | { | |
70 | return 0; | |
71 | } | |
72 | ||
73 | int ltt_statedump_default(struct ltt_trace_struct *trace) | |
74 | { | |
75 | return 0; | |
76 | } | |
77 | ||
78 | /* Callbacks for registered modules */ | |
79 | ||
80 | int (*ltt_filter_control_functor) | |
81 | (enum ltt_filter_control_msg msg, struct ltt_trace_struct *trace) = | |
82 | ltt_filter_control_default; | |
83 | struct module *ltt_filter_control_owner; | |
84 | ||
85 | /* These function pointers are protected by a trace activation check */ | |
86 | struct module *ltt_run_filter_owner; | |
87 | int (*ltt_statedump_functor)(struct ltt_trace_struct *trace) = | |
88 | ltt_statedump_default; | |
89 | struct module *ltt_statedump_owner; | |
90 | ||
91 | struct chan_info_struct { | |
92 | const char *name; | |
93 | unsigned int def_subbufsize; | |
94 | unsigned int def_subbufcount; | |
95 | } chan_infos[] = { | |
96 | [LTT_CHANNEL_METADATA] = { | |
97 | LTT_METADATA_CHANNEL, | |
98 | LTT_DEFAULT_SUBBUF_SIZE_LOW, | |
99 | LTT_DEFAULT_N_SUBBUFS_LOW, | |
100 | }, | |
b6bf28ec PMF |
101 | [LTT_CHANNEL_UST] = { |
102 | LTT_UST_CHANNEL, | |
9dad1eb8 PMF |
103 | LTT_DEFAULT_SUBBUF_SIZE_HIGH, |
104 | LTT_DEFAULT_N_SUBBUFS_HIGH, | |
105 | }, | |
9dad1eb8 PMF |
106 | }; |
107 | ||
108 | static enum ltt_channels get_channel_type_from_name(const char *name) | |
109 | { | |
110 | int i; | |
111 | ||
112 | if (!name) | |
b6bf28ec | 113 | return LTT_CHANNEL_UST; |
9dad1eb8 PMF |
114 | |
115 | for (i = 0; i < ARRAY_SIZE(chan_infos); i++) | |
116 | if (chan_infos[i].name && !strcmp(name, chan_infos[i].name)) | |
117 | return (enum ltt_channels)i; | |
118 | ||
b6bf28ec | 119 | return LTT_CHANNEL_UST; |
9dad1eb8 PMF |
120 | } |
121 | ||
122 | /** | |
123 | * ltt_module_register - LTT module registration | |
124 | * @name: module type | |
125 | * @function: callback to register | |
126 | * @owner: module which owns the callback | |
127 | * | |
128 | * The module calling this registration function must ensure that no | |
129 | * trap-inducing code will be executed by "function". E.g. vmalloc_sync_all() | |
130 | * must be called between a vmalloc and the moment the memory is made visible to | |
131 | * "function". This registration acts as a vmalloc_sync_all. Therefore, only if | |
132 | * the module allocates virtual memory after its registration must it | |
133 | * synchronize the TLBs. | |
134 | */ | |
b6bf28ec PMF |
135 | //ust// int ltt_module_register(enum ltt_module_function name, void *function, |
136 | //ust// struct module *owner) | |
137 | //ust// { | |
138 | //ust// int ret = 0; | |
139 | //ust// | |
140 | //ust// /* | |
141 | //ust// * Make sure no page fault can be triggered by the module about to be | |
142 | //ust// * registered. We deal with this here so we don't have to call | |
143 | //ust// * vmalloc_sync_all() in each module's init. | |
144 | //ust// */ | |
145 | //ust// vmalloc_sync_all(); | |
146 | //ust// | |
147 | //ust// switch (name) { | |
148 | //ust// case LTT_FUNCTION_RUN_FILTER: | |
149 | //ust// if (ltt_run_filter_owner != NULL) { | |
150 | //ust// ret = -EEXIST; | |
151 | //ust// goto end; | |
152 | //ust// } | |
153 | //ust// ltt_filter_register((ltt_run_filter_functor)function); | |
154 | //ust// ltt_run_filter_owner = owner; | |
155 | //ust// break; | |
156 | //ust// case LTT_FUNCTION_FILTER_CONTROL: | |
157 | //ust// if (ltt_filter_control_owner != NULL) { | |
158 | //ust// ret = -EEXIST; | |
159 | //ust// goto end; | |
160 | //ust// } | |
161 | //ust// ltt_filter_control_functor = | |
162 | //ust// (int (*)(enum ltt_filter_control_msg, | |
163 | //ust// struct ltt_trace_struct *))function; | |
164 | //ust// ltt_filter_control_owner = owner; | |
165 | //ust// break; | |
166 | //ust// case LTT_FUNCTION_STATEDUMP: | |
167 | //ust// if (ltt_statedump_owner != NULL) { | |
168 | //ust// ret = -EEXIST; | |
169 | //ust// goto end; | |
170 | //ust// } | |
171 | //ust// ltt_statedump_functor = | |
172 | //ust// (int (*)(struct ltt_trace_struct *))function; | |
173 | //ust// ltt_statedump_owner = owner; | |
174 | //ust// break; | |
175 | //ust// } | |
176 | //ust// | |
177 | //ust// end: | |
178 | //ust// | |
179 | //ust// return ret; | |
180 | //ust// } | |
181 | //ust// EXPORT_SYMBOL_GPL(ltt_module_register); | |
9dad1eb8 PMF |
182 | |
183 | /** | |
184 | * ltt_module_unregister - LTT module unregistration | |
185 | * @name: module type | |
186 | */ | |
b6bf28ec PMF |
187 | //ust// void ltt_module_unregister(enum ltt_module_function name) |
188 | //ust// { | |
189 | //ust// switch (name) { | |
190 | //ust// case LTT_FUNCTION_RUN_FILTER: | |
191 | //ust// ltt_filter_unregister(); | |
192 | //ust// ltt_run_filter_owner = NULL; | |
193 | //ust// /* Wait for preempt sections to finish */ | |
194 | //ust// synchronize_sched(); | |
195 | //ust// break; | |
196 | //ust// case LTT_FUNCTION_FILTER_CONTROL: | |
197 | //ust// ltt_filter_control_functor = ltt_filter_control_default; | |
198 | //ust// ltt_filter_control_owner = NULL; | |
199 | //ust// break; | |
200 | //ust// case LTT_FUNCTION_STATEDUMP: | |
201 | //ust// ltt_statedump_functor = ltt_statedump_default; | |
202 | //ust// ltt_statedump_owner = NULL; | |
203 | //ust// break; | |
204 | //ust// } | |
205 | //ust// | |
206 | //ust// } | |
207 | //ust// EXPORT_SYMBOL_GPL(ltt_module_unregister); | |
9dad1eb8 PMF |
208 | |
209 | static LIST_HEAD(ltt_transport_list); | |
210 | ||
211 | /** | |
212 | * ltt_transport_register - LTT transport registration | |
213 | * @transport: transport structure | |
214 | * | |
215 | * Registers a transport which can be used as output to extract the data out of | |
216 | * LTTng. The module calling this registration function must ensure that no | |
217 | * trap-inducing code will be executed by the transport functions. E.g. | |
218 | * vmalloc_sync_all() must be called between a vmalloc and the moment the memory | |
219 | * is made visible to the transport function. This registration acts as a | |
220 | * vmalloc_sync_all. Therefore, only if the module allocates virtual memory | |
221 | * after its registration must it synchronize the TLBs. | |
222 | */ | |
5f54827b PMF |
223 | void ltt_transport_register(struct ltt_transport *transport) |
224 | { | |
225 | /* | |
226 | * Make sure no page fault can be triggered by the module about to be | |
227 | * registered. We deal with this here so we don't have to call | |
228 | * vmalloc_sync_all() in each module's init. | |
229 | */ | |
bb07823d | 230 | //ust// vmalloc_sync_all(); |
5f54827b PMF |
231 | |
232 | ltt_lock_traces(); | |
233 | list_add_tail(&transport->node, <t_transport_list); | |
234 | ltt_unlock_traces(); | |
235 | } | |
b6bf28ec | 236 | //ust// EXPORT_SYMBOL_GPL(ltt_transport_register); |
9dad1eb8 PMF |
237 | |
238 | /** | |
239 | * ltt_transport_unregister - LTT transport unregistration | |
240 | * @transport: transport structure | |
241 | */ | |
bb07823d PMF |
242 | void ltt_transport_unregister(struct ltt_transport *transport) |
243 | { | |
244 | ltt_lock_traces(); | |
245 | list_del(&transport->node); | |
246 | ltt_unlock_traces(); | |
247 | } | |
b6bf28ec | 248 | //ust// EXPORT_SYMBOL_GPL(ltt_transport_unregister); |
9dad1eb8 PMF |
249 | |
250 | static inline int is_channel_overwrite(enum ltt_channels chan, | |
251 | enum trace_mode mode) | |
252 | { | |
253 | switch (mode) { | |
254 | case LTT_TRACE_NORMAL: | |
255 | return 0; | |
256 | case LTT_TRACE_FLIGHT: | |
257 | switch (chan) { | |
258 | case LTT_CHANNEL_METADATA: | |
259 | return 0; | |
260 | default: | |
261 | return 1; | |
262 | } | |
263 | case LTT_TRACE_HYBRID: | |
264 | switch (chan) { | |
b6bf28ec | 265 | case LTT_CHANNEL_METADATA: |
9dad1eb8 | 266 | return 0; |
b6bf28ec PMF |
267 | default: |
268 | return 1; | |
9dad1eb8 PMF |
269 | } |
270 | default: | |
271 | return 0; | |
272 | } | |
273 | } | |
274 | ||
275 | /** | |
276 | * ltt_write_trace_header - Write trace header | |
277 | * @trace: Trace information | |
278 | * @header: Memory address where the information must be written to | |
279 | */ | |
280 | void notrace ltt_write_trace_header(struct ltt_trace_struct *trace, | |
281 | struct ltt_subbuffer_header *header) | |
282 | { | |
283 | header->magic_number = LTT_TRACER_MAGIC_NUMBER; | |
284 | header->major_version = LTT_TRACER_VERSION_MAJOR; | |
285 | header->minor_version = LTT_TRACER_VERSION_MINOR; | |
286 | header->arch_size = sizeof(void *); | |
287 | header->alignment = ltt_get_alignment(); | |
288 | header->start_time_sec = trace->start_time.tv_sec; | |
289 | header->start_time_usec = trace->start_time.tv_usec; | |
290 | header->start_freq = trace->start_freq; | |
291 | header->freq_scale = trace->freq_scale; | |
292 | } | |
b6bf28ec | 293 | //ust// EXPORT_SYMBOL_GPL(ltt_write_trace_header); |
9dad1eb8 PMF |
294 | |
295 | static void trace_async_wakeup(struct ltt_trace_struct *trace) | |
296 | { | |
297 | int i; | |
298 | struct ltt_channel_struct *chan; | |
299 | ||
300 | /* Must check each channel for pending read wakeup */ | |
301 | for (i = 0; i < trace->nr_channels; i++) { | |
302 | chan = &trace->channels[i]; | |
303 | if (chan->active) | |
304 | trace->ops->wakeup_channel(chan); | |
305 | } | |
306 | } | |
307 | ||
b6bf28ec PMF |
308 | //ust// /* Timer to send async wakeups to the readers */ |
309 | //ust// static void async_wakeup(unsigned long data) | |
310 | //ust// { | |
311 | //ust// struct ltt_trace_struct *trace; | |
312 | //ust// | |
313 | //ust// /* | |
314 | //ust// * PREEMPT_RT does not allow spinlocks to be taken within preempt | |
315 | //ust// * disable sections (spinlock taken in wake_up). However, mainline won't | |
316 | //ust// * allow mutex to be taken in interrupt context. Ugly. | |
317 | //ust// * A proper way to do this would be to turn the timer into a | |
318 | //ust// * periodically woken up thread, but it adds to the footprint. | |
319 | //ust// */ | |
320 | //ust// #ifndef CONFIG_PREEMPT_RT | |
321 | //ust// rcu_read_lock_sched(); | |
322 | //ust// #else | |
323 | //ust// ltt_lock_traces(); | |
324 | //ust// #endif | |
325 | //ust// list_for_each_entry_rcu(trace, <t_traces.head, list) { | |
326 | //ust// trace_async_wakeup(trace); | |
327 | //ust// } | |
328 | //ust// #ifndef CONFIG_PREEMPT_RT | |
329 | //ust// rcu_read_unlock_sched(); | |
330 | //ust// #else | |
331 | //ust// ltt_unlock_traces(); | |
332 | //ust// #endif | |
333 | //ust// | |
334 | //ust// mod_timer(<t_async_wakeup_timer, jiffies + LTT_PERCPU_TIMER_INTERVAL); | |
335 | //ust// } | |
9dad1eb8 PMF |
336 | |
337 | /** | |
338 | * _ltt_trace_find - find a trace by given name. | |
339 | * trace_name: trace name | |
340 | * | |
341 | * Returns a pointer to the trace structure, NULL if not found. | |
342 | */ | |
9c67dc50 | 343 | struct ltt_trace_struct *_ltt_trace_find(const char *trace_name) |
9dad1eb8 PMF |
344 | { |
345 | struct ltt_trace_struct *trace; | |
346 | ||
347 | list_for_each_entry(trace, <t_traces.head, list) | |
348 | if (!strncmp(trace->trace_name, trace_name, NAME_MAX)) | |
349 | return trace; | |
350 | ||
351 | return NULL; | |
352 | } | |
353 | ||
354 | /* _ltt_trace_find_setup : | |
355 | * find a trace in setup list by given name. | |
356 | * | |
357 | * Returns a pointer to the trace structure, NULL if not found. | |
358 | */ | |
359 | struct ltt_trace_struct *_ltt_trace_find_setup(const char *trace_name) | |
360 | { | |
361 | struct ltt_trace_struct *trace; | |
362 | ||
363 | list_for_each_entry(trace, <t_traces.setup_head, list) | |
364 | if (!strncmp(trace->trace_name, trace_name, NAME_MAX)) | |
365 | return trace; | |
366 | ||
367 | return NULL; | |
368 | } | |
b6bf28ec | 369 | //ust// EXPORT_SYMBOL_GPL(_ltt_trace_find_setup); |
9dad1eb8 PMF |
370 | |
371 | /** | |
372 | * ltt_release_transport - Release an LTT transport | |
373 | * @kref : reference count on the transport | |
374 | */ | |
375 | void ltt_release_transport(struct kref *kref) | |
376 | { | |
772030fe PMF |
377 | //ust// struct ltt_trace_struct *trace = container_of(kref, |
378 | //ust// struct ltt_trace_struct, ltt_transport_kref); | |
379 | //ust// trace->ops->remove_dirs(trace); | |
9dad1eb8 | 380 | } |
b6bf28ec | 381 | //ust// EXPORT_SYMBOL_GPL(ltt_release_transport); |
9dad1eb8 PMF |
382 | |
383 | /** | |
384 | * ltt_release_trace - Release a LTT trace | |
385 | * @kref : reference count on the trace | |
386 | */ | |
387 | void ltt_release_trace(struct kref *kref) | |
388 | { | |
389 | struct ltt_trace_struct *trace = container_of(kref, | |
390 | struct ltt_trace_struct, kref); | |
391 | ltt_channels_trace_free(trace->channels); | |
392 | kfree(trace); | |
393 | } | |
b6bf28ec | 394 | //ust// EXPORT_SYMBOL_GPL(ltt_release_trace); |
9dad1eb8 PMF |
395 | |
396 | static inline void prepare_chan_size_num(unsigned int *subbuf_size, | |
397 | unsigned int *n_subbufs) | |
398 | { | |
399 | *subbuf_size = 1 << get_count_order(*subbuf_size); | |
400 | *n_subbufs = 1 << get_count_order(*n_subbufs); | |
401 | ||
402 | /* Subbuf size and number must both be power of two */ | |
403 | WARN_ON(hweight32(*subbuf_size) != 1); | |
404 | WARN_ON(hweight32(*n_subbufs) != 1); | |
405 | } | |
406 | ||
407 | int _ltt_trace_setup(const char *trace_name) | |
408 | { | |
409 | int err = 0; | |
410 | struct ltt_trace_struct *new_trace = NULL; | |
411 | int metadata_index; | |
412 | unsigned int chan; | |
413 | enum ltt_channels chantype; | |
414 | ||
415 | if (_ltt_trace_find_setup(trace_name)) { | |
416 | printk(KERN_ERR "LTT : Trace name %s already used.\n", | |
417 | trace_name); | |
418 | err = -EEXIST; | |
419 | goto traces_error; | |
420 | } | |
421 | ||
422 | if (_ltt_trace_find(trace_name)) { | |
423 | printk(KERN_ERR "LTT : Trace name %s already used.\n", | |
424 | trace_name); | |
425 | err = -EEXIST; | |
426 | goto traces_error; | |
427 | } | |
428 | ||
429 | new_trace = kzalloc(sizeof(struct ltt_trace_struct), GFP_KERNEL); | |
430 | if (!new_trace) { | |
431 | printk(KERN_ERR | |
432 | "LTT : Unable to allocate memory for trace %s\n", | |
433 | trace_name); | |
434 | err = -ENOMEM; | |
435 | goto traces_error; | |
436 | } | |
437 | strncpy(new_trace->trace_name, trace_name, NAME_MAX); | |
438 | new_trace->channels = ltt_channels_trace_alloc(&new_trace->nr_channels, | |
439 | 0, 1); | |
440 | if (!new_trace->channels) { | |
441 | printk(KERN_ERR | |
442 | "LTT : Unable to allocate memory for chaninfo %s\n", | |
443 | trace_name); | |
444 | err = -ENOMEM; | |
445 | goto trace_free; | |
446 | } | |
447 | ||
448 | /* | |
449 | * Force metadata channel to active, no overwrite. | |
450 | */ | |
451 | metadata_index = ltt_channels_get_index_from_name("metadata"); | |
452 | WARN_ON(metadata_index < 0); | |
453 | new_trace->channels[metadata_index].overwrite = 0; | |
454 | new_trace->channels[metadata_index].active = 1; | |
455 | ||
456 | /* | |
457 | * Set hardcoded tracer defaults for some channels | |
458 | */ | |
459 | for (chan = 0; chan < new_trace->nr_channels; chan++) { | |
460 | if (!(new_trace->channels[chan].active)) | |
461 | continue; | |
462 | ||
463 | chantype = get_channel_type_from_name( | |
464 | ltt_channels_get_name_from_index(chan)); | |
465 | new_trace->channels[chan].subbuf_size = | |
466 | chan_infos[chantype].def_subbufsize; | |
467 | new_trace->channels[chan].subbuf_cnt = | |
468 | chan_infos[chantype].def_subbufcount; | |
469 | } | |
470 | ||
471 | list_add(&new_trace->list, <t_traces.setup_head); | |
472 | return 0; | |
473 | ||
474 | trace_free: | |
475 | kfree(new_trace); | |
476 | traces_error: | |
477 | return err; | |
478 | } | |
b6bf28ec | 479 | //ust// EXPORT_SYMBOL_GPL(_ltt_trace_setup); |
9dad1eb8 PMF |
480 | |
481 | ||
482 | int ltt_trace_setup(const char *trace_name) | |
483 | { | |
484 | int ret; | |
485 | ltt_lock_traces(); | |
486 | ret = _ltt_trace_setup(trace_name); | |
487 | ltt_unlock_traces(); | |
488 | return ret; | |
489 | } | |
b6bf28ec | 490 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_setup); |
9dad1eb8 PMF |
491 | |
492 | /* must be called from within a traces lock. */ | |
493 | static void _ltt_trace_free(struct ltt_trace_struct *trace) | |
494 | { | |
495 | list_del(&trace->list); | |
496 | kfree(trace); | |
497 | } | |
498 | ||
499 | int ltt_trace_set_type(const char *trace_name, const char *trace_type) | |
500 | { | |
501 | int err = 0; | |
502 | struct ltt_trace_struct *trace; | |
503 | struct ltt_transport *tran_iter, *transport = NULL; | |
504 | ||
505 | ltt_lock_traces(); | |
506 | ||
507 | trace = _ltt_trace_find_setup(trace_name); | |
508 | if (!trace) { | |
509 | printk(KERN_ERR "LTT : Trace not found %s\n", trace_name); | |
510 | err = -ENOENT; | |
511 | goto traces_error; | |
512 | } | |
513 | ||
514 | list_for_each_entry(tran_iter, <t_transport_list, node) { | |
515 | if (!strcmp(tran_iter->name, trace_type)) { | |
516 | transport = tran_iter; | |
517 | break; | |
518 | } | |
519 | } | |
520 | if (!transport) { | |
521 | printk(KERN_ERR "LTT : Transport %s is not present.\n", | |
522 | trace_type); | |
523 | err = -EINVAL; | |
524 | goto traces_error; | |
525 | } | |
526 | ||
527 | trace->transport = transport; | |
528 | ||
529 | traces_error: | |
530 | ltt_unlock_traces(); | |
531 | return err; | |
532 | } | |
b6bf28ec | 533 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_set_type); |
9dad1eb8 PMF |
534 | |
535 | int ltt_trace_set_channel_subbufsize(const char *trace_name, | |
536 | const char *channel_name, unsigned int size) | |
537 | { | |
538 | int err = 0; | |
539 | struct ltt_trace_struct *trace; | |
540 | int index; | |
541 | ||
542 | ltt_lock_traces(); | |
543 | ||
544 | trace = _ltt_trace_find_setup(trace_name); | |
545 | if (!trace) { | |
546 | printk(KERN_ERR "LTT : Trace not found %s\n", trace_name); | |
547 | err = -ENOENT; | |
548 | goto traces_error; | |
549 | } | |
550 | ||
551 | index = ltt_channels_get_index_from_name(channel_name); | |
552 | if (index < 0) { | |
553 | printk(KERN_ERR "LTT : Channel %s not found\n", channel_name); | |
554 | err = -ENOENT; | |
555 | goto traces_error; | |
556 | } | |
557 | trace->channels[index].subbuf_size = size; | |
558 | ||
559 | traces_error: | |
560 | ltt_unlock_traces(); | |
561 | return err; | |
562 | } | |
b6bf28ec | 563 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_set_channel_subbufsize); |
9dad1eb8 PMF |
564 | |
565 | int ltt_trace_set_channel_subbufcount(const char *trace_name, | |
566 | const char *channel_name, unsigned int cnt) | |
567 | { | |
568 | int err = 0; | |
569 | struct ltt_trace_struct *trace; | |
570 | int index; | |
571 | ||
572 | ltt_lock_traces(); | |
573 | ||
574 | trace = _ltt_trace_find_setup(trace_name); | |
575 | if (!trace) { | |
576 | printk(KERN_ERR "LTT : Trace not found %s\n", trace_name); | |
577 | err = -ENOENT; | |
578 | goto traces_error; | |
579 | } | |
580 | ||
581 | index = ltt_channels_get_index_from_name(channel_name); | |
582 | if (index < 0) { | |
583 | printk(KERN_ERR "LTT : Channel %s not found\n", channel_name); | |
584 | err = -ENOENT; | |
585 | goto traces_error; | |
586 | } | |
587 | trace->channels[index].subbuf_cnt = cnt; | |
588 | ||
589 | traces_error: | |
590 | ltt_unlock_traces(); | |
591 | return err; | |
592 | } | |
b6bf28ec | 593 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_set_channel_subbufcount); |
9dad1eb8 PMF |
594 | |
595 | int ltt_trace_set_channel_enable(const char *trace_name, | |
596 | const char *channel_name, unsigned int enable) | |
597 | { | |
598 | int err = 0; | |
599 | struct ltt_trace_struct *trace; | |
600 | int index; | |
601 | ||
602 | ltt_lock_traces(); | |
603 | ||
604 | trace = _ltt_trace_find_setup(trace_name); | |
605 | if (!trace) { | |
606 | printk(KERN_ERR "LTT : Trace not found %s\n", trace_name); | |
607 | err = -ENOENT; | |
608 | goto traces_error; | |
609 | } | |
610 | ||
611 | /* | |
612 | * Datas in metadata channel(marker info) is necessary to be able to | |
613 | * read the trace, we always enable this channel. | |
614 | */ | |
615 | if (!enable && !strcmp(channel_name, "metadata")) { | |
616 | printk(KERN_ERR "LTT : Trying to disable metadata channel\n"); | |
617 | err = -EINVAL; | |
618 | goto traces_error; | |
619 | } | |
620 | ||
621 | index = ltt_channels_get_index_from_name(channel_name); | |
622 | if (index < 0) { | |
623 | printk(KERN_ERR "LTT : Channel %s not found\n", channel_name); | |
624 | err = -ENOENT; | |
625 | goto traces_error; | |
626 | } | |
627 | ||
628 | trace->channels[index].active = enable; | |
629 | ||
630 | traces_error: | |
631 | ltt_unlock_traces(); | |
632 | return err; | |
633 | } | |
b6bf28ec | 634 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_set_channel_enable); |
9dad1eb8 PMF |
635 | |
636 | int ltt_trace_set_channel_overwrite(const char *trace_name, | |
637 | const char *channel_name, unsigned int overwrite) | |
638 | { | |
639 | int err = 0; | |
640 | struct ltt_trace_struct *trace; | |
641 | int index; | |
642 | ||
643 | ltt_lock_traces(); | |
644 | ||
645 | trace = _ltt_trace_find_setup(trace_name); | |
646 | if (!trace) { | |
647 | printk(KERN_ERR "LTT : Trace not found %s\n", trace_name); | |
648 | err = -ENOENT; | |
649 | goto traces_error; | |
650 | } | |
651 | ||
652 | /* | |
653 | * Always put the metadata channel in non-overwrite mode : | |
654 | * This is a very low traffic channel and it can't afford to have its | |
655 | * data overwritten : this data (marker info) is necessary to be | |
656 | * able to read the trace. | |
657 | */ | |
658 | if (overwrite && !strcmp(channel_name, "metadata")) { | |
659 | printk(KERN_ERR "LTT : Trying to set metadata channel to " | |
660 | "overwrite mode\n"); | |
661 | err = -EINVAL; | |
662 | goto traces_error; | |
663 | } | |
664 | ||
665 | index = ltt_channels_get_index_from_name(channel_name); | |
666 | if (index < 0) { | |
667 | printk(KERN_ERR "LTT : Channel %s not found\n", channel_name); | |
668 | err = -ENOENT; | |
669 | goto traces_error; | |
670 | } | |
671 | ||
672 | trace->channels[index].overwrite = overwrite; | |
673 | ||
674 | traces_error: | |
675 | ltt_unlock_traces(); | |
676 | return err; | |
677 | } | |
b6bf28ec | 678 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_set_channel_overwrite); |
9dad1eb8 PMF |
679 | |
680 | int ltt_trace_alloc(const char *trace_name) | |
681 | { | |
682 | int err = 0; | |
683 | struct ltt_trace_struct *trace; | |
c697d411 | 684 | unsigned int subbuf_size, subbuf_cnt; |
772030fe | 685 | //ust// unsigned long flags; |
9dad1eb8 PMF |
686 | int chan; |
687 | const char *channel_name; | |
688 | ||
689 | ltt_lock_traces(); | |
690 | ||
691 | trace = _ltt_trace_find_setup(trace_name); | |
692 | if (!trace) { | |
693 | printk(KERN_ERR "LTT : Trace not found %s\n", trace_name); | |
694 | err = -ENOENT; | |
695 | goto traces_error; | |
696 | } | |
697 | ||
698 | kref_init(&trace->kref); | |
699 | kref_init(&trace->ltt_transport_kref); | |
b6bf28ec | 700 | //ust// init_waitqueue_head(&trace->kref_wq); |
9dad1eb8 | 701 | trace->active = 0; |
b6bf28ec | 702 | //ust// get_trace_clock(); |
9dad1eb8 PMF |
703 | trace->freq_scale = trace_clock_freq_scale(); |
704 | ||
705 | if (!trace->transport) { | |
706 | printk(KERN_ERR "LTT : Transport is not set.\n"); | |
707 | err = -EINVAL; | |
708 | goto transport_error; | |
709 | } | |
b6bf28ec PMF |
710 | //ust// if (!try_module_get(trace->transport->owner)) { |
711 | //ust// printk(KERN_ERR "LTT : Can't lock transport module.\n"); | |
712 | //ust// err = -ENODEV; | |
713 | //ust// goto transport_error; | |
714 | //ust// } | |
9dad1eb8 PMF |
715 | trace->ops = &trace->transport->ops; |
716 | ||
b6bf28ec PMF |
717 | //ust// err = trace->ops->create_dirs(trace); |
718 | //ust// if (err) { | |
719 | //ust// printk(KERN_ERR "LTT : Can't create dir for trace %s.\n", | |
720 | //ust// trace_name); | |
721 | //ust// goto dirs_error; | |
722 | //ust// } | |
9dad1eb8 | 723 | |
b6bf28ec | 724 | //ust// local_irq_save(flags); |
9dad1eb8 PMF |
725 | trace->start_freq = trace_clock_frequency(); |
726 | trace->start_tsc = trace_clock_read64(); | |
b6bf28ec PMF |
727 | gettimeofday(&trace->start_time, NULL); //ust// changed |
728 | //ust// local_irq_restore(flags); | |
9dad1eb8 PMF |
729 | |
730 | for (chan = 0; chan < trace->nr_channels; chan++) { | |
731 | if (!(trace->channels[chan].active)) | |
732 | continue; | |
733 | ||
734 | channel_name = ltt_channels_get_name_from_index(chan); | |
735 | WARN_ON(!channel_name); | |
736 | subbuf_size = trace->channels[chan].subbuf_size; | |
737 | subbuf_cnt = trace->channels[chan].subbuf_cnt; | |
738 | prepare_chan_size_num(&subbuf_size, &subbuf_cnt); | |
739 | err = trace->ops->create_channel(trace_name, trace, | |
740 | trace->dentry.trace_root, | |
741 | channel_name, | |
742 | &trace->channels[chan], | |
743 | subbuf_size, | |
744 | subbuf_cnt, | |
745 | trace->channels[chan].overwrite); | |
746 | if (err != 0) { | |
747 | printk(KERN_ERR "LTT : Can't create channel %s.\n", | |
748 | channel_name); | |
749 | goto create_channel_error; | |
750 | } | |
751 | } | |
752 | ||
753 | list_del(&trace->list); | |
b6bf28ec PMF |
754 | //ust// if (list_empty(<t_traces.head)) { |
755 | //ust// mod_timer(<t_async_wakeup_timer, | |
756 | //ust// jiffies + LTT_PERCPU_TIMER_INTERVAL); | |
757 | //ust// set_kernel_trace_flag_all_tasks(); | |
758 | //ust// } | |
8d938dbd | 759 | list_add_rcu(&trace->list, <t_traces.head); |
b6bf28ec | 760 | //ust// synchronize_sched(); |
9dad1eb8 PMF |
761 | |
762 | ltt_unlock_traces(); | |
763 | ||
764 | return 0; | |
765 | ||
766 | create_channel_error: | |
767 | for (chan--; chan >= 0; chan--) | |
768 | if (trace->channels[chan].active) | |
769 | trace->ops->remove_channel(&trace->channels[chan]); | |
770 | ||
772030fe | 771 | //ust// dirs_error: |
b6bf28ec | 772 | //ust// module_put(trace->transport->owner); |
9dad1eb8 | 773 | transport_error: |
b6bf28ec | 774 | //ust// put_trace_clock(); |
9dad1eb8 PMF |
775 | traces_error: |
776 | ltt_unlock_traces(); | |
777 | return err; | |
778 | } | |
b6bf28ec | 779 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_alloc); |
9dad1eb8 PMF |
780 | |
781 | /* | |
782 | * It is worked as a wrapper for current version of ltt_control.ko. | |
783 | * We will make a new ltt_control based on debugfs, and control each channel's | |
784 | * buffer. | |
785 | */ | |
772030fe PMF |
786 | //ust// static int ltt_trace_create(const char *trace_name, const char *trace_type, |
787 | //ust// enum trace_mode mode, | |
788 | //ust// unsigned int subbuf_size_low, unsigned int n_subbufs_low, | |
789 | //ust// unsigned int subbuf_size_med, unsigned int n_subbufs_med, | |
790 | //ust// unsigned int subbuf_size_high, unsigned int n_subbufs_high) | |
791 | //ust// { | |
792 | //ust// int err = 0; | |
793 | //ust// | |
794 | //ust// err = ltt_trace_setup(trace_name); | |
795 | //ust// if (IS_ERR_VALUE(err)) | |
796 | //ust// return err; | |
797 | //ust// | |
798 | //ust// err = ltt_trace_set_type(trace_name, trace_type); | |
799 | //ust// if (IS_ERR_VALUE(err)) | |
800 | //ust// return err; | |
801 | //ust// | |
802 | //ust// err = ltt_trace_alloc(trace_name); | |
803 | //ust// if (IS_ERR_VALUE(err)) | |
804 | //ust// return err; | |
805 | //ust// | |
806 | //ust// return err; | |
807 | //ust// } | |
9dad1eb8 PMF |
808 | |
809 | /* Must be called while sure that trace is in the list. */ | |
99b72dc0 | 810 | static int _ltt_trace_destroy(struct ltt_trace_struct *trace) |
9dad1eb8 PMF |
811 | { |
812 | int err = -EPERM; | |
813 | ||
814 | if (trace == NULL) { | |
815 | err = -ENOENT; | |
816 | goto traces_error; | |
817 | } | |
818 | if (trace->active) { | |
819 | printk(KERN_ERR | |
820 | "LTT : Can't destroy trace %s : tracer is active\n", | |
821 | trace->trace_name); | |
822 | err = -EBUSY; | |
823 | goto active_error; | |
824 | } | |
825 | /* Everything went fine */ | |
a3272941 PMF |
826 | list_del_rcu(&trace->list); |
827 | synchronize_rcu(); | |
9dad1eb8 | 828 | if (list_empty(<t_traces.head)) { |
b6bf28ec | 829 | //ust// clear_kernel_trace_flag_all_tasks(); |
9dad1eb8 PMF |
830 | /* |
831 | * We stop the asynchronous delivery of reader wakeup, but | |
832 | * we must make one last check for reader wakeups pending | |
833 | * later in __ltt_trace_destroy. | |
834 | */ | |
b6bf28ec | 835 | //ust// del_timer_sync(<t_async_wakeup_timer); |
9dad1eb8 PMF |
836 | } |
837 | return 0; | |
838 | ||
839 | /* error handling */ | |
840 | active_error: | |
841 | traces_error: | |
842 | return err; | |
843 | } | |
844 | ||
845 | /* Sleepable part of the destroy */ | |
846 | static void __ltt_trace_destroy(struct ltt_trace_struct *trace) | |
847 | { | |
848 | int i; | |
849 | struct ltt_channel_struct *chan; | |
850 | ||
851 | for (i = 0; i < trace->nr_channels; i++) { | |
852 | chan = &trace->channels[i]; | |
853 | if (chan->active) | |
854 | trace->ops->finish_channel(chan); | |
855 | } | |
856 | ||
98963de4 | 857 | return; /* FIXME: temporary for ust */ |
b6bf28ec | 858 | //ust// flush_scheduled_work(); |
9dad1eb8 PMF |
859 | |
860 | /* | |
861 | * The currently destroyed trace is not in the trace list anymore, | |
862 | * so it's safe to call the async wakeup ourself. It will deliver | |
863 | * the last subbuffers. | |
864 | */ | |
865 | trace_async_wakeup(trace); | |
866 | ||
867 | for (i = 0; i < trace->nr_channels; i++) { | |
868 | chan = &trace->channels[i]; | |
869 | if (chan->active) | |
870 | trace->ops->remove_channel(chan); | |
871 | } | |
872 | ||
873 | kref_put(&trace->ltt_transport_kref, ltt_release_transport); | |
874 | ||
b6bf28ec | 875 | //ust// module_put(trace->transport->owner); |
9dad1eb8 PMF |
876 | |
877 | /* | |
878 | * Wait for lttd readers to release the files, therefore making sure | |
879 | * the last subbuffers have been read. | |
880 | */ | |
b6bf28ec PMF |
881 | //ust// if (atomic_read(&trace->kref.refcount) > 1) { |
882 | //ust// int ret = 0; | |
883 | //ust// __wait_event_interruptible(trace->kref_wq, | |
884 | //ust// (atomic_read(&trace->kref.refcount) == 1), ret); | |
885 | //ust// } | |
9dad1eb8 PMF |
886 | kref_put(&trace->kref, ltt_release_trace); |
887 | } | |
888 | ||
889 | int ltt_trace_destroy(const char *trace_name) | |
890 | { | |
891 | int err = 0; | |
892 | struct ltt_trace_struct *trace; | |
893 | ||
894 | ltt_lock_traces(); | |
895 | ||
896 | trace = _ltt_trace_find(trace_name); | |
897 | if (trace) { | |
898 | err = _ltt_trace_destroy(trace); | |
899 | if (err) | |
900 | goto error; | |
901 | ||
902 | ltt_unlock_traces(); | |
903 | ||
904 | __ltt_trace_destroy(trace); | |
b6bf28ec | 905 | //ust// put_trace_clock(); |
9dad1eb8 PMF |
906 | |
907 | return 0; | |
908 | } | |
909 | ||
910 | trace = _ltt_trace_find_setup(trace_name); | |
911 | if (trace) { | |
912 | _ltt_trace_free(trace); | |
913 | ltt_unlock_traces(); | |
914 | return 0; | |
915 | } | |
916 | ||
917 | err = -ENOENT; | |
918 | ||
919 | /* Error handling */ | |
920 | error: | |
921 | ltt_unlock_traces(); | |
922 | return err; | |
923 | } | |
b6bf28ec | 924 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_destroy); |
9dad1eb8 PMF |
925 | |
926 | /* must be called from within a traces lock. */ | |
927 | static int _ltt_trace_start(struct ltt_trace_struct *trace) | |
928 | { | |
929 | int err = 0; | |
930 | ||
931 | if (trace == NULL) { | |
932 | err = -ENOENT; | |
933 | goto traces_error; | |
934 | } | |
935 | if (trace->active) | |
936 | printk(KERN_INFO "LTT : Tracing already active for trace %s\n", | |
937 | trace->trace_name); | |
b6bf28ec PMF |
938 | //ust// if (!try_module_get(ltt_run_filter_owner)) { |
939 | //ust// err = -ENODEV; | |
940 | //ust// printk(KERN_ERR "LTT : Can't lock filter module.\n"); | |
941 | //ust// goto get_ltt_run_filter_error; | |
942 | //ust// } | |
9dad1eb8 PMF |
943 | trace->active = 1; |
944 | /* Read by trace points without protection : be careful */ | |
945 | ltt_traces.num_active_traces++; | |
946 | return err; | |
947 | ||
948 | /* error handling */ | |
772030fe | 949 | //ust// get_ltt_run_filter_error: |
9dad1eb8 PMF |
950 | traces_error: |
951 | return err; | |
952 | } | |
953 | ||
954 | int ltt_trace_start(const char *trace_name) | |
955 | { | |
956 | int err = 0; | |
957 | struct ltt_trace_struct *trace; | |
958 | ||
959 | ltt_lock_traces(); | |
960 | ||
961 | trace = _ltt_trace_find(trace_name); | |
962 | err = _ltt_trace_start(trace); | |
963 | if (err) | |
964 | goto no_trace; | |
965 | ||
966 | ltt_unlock_traces(); | |
967 | ||
968 | /* | |
969 | * Call the kernel state dump. | |
970 | * Events will be mixed with real kernel events, it's ok. | |
971 | * Notice that there is no protection on the trace : that's exactly | |
972 | * why we iterate on the list and check for trace equality instead of | |
973 | * directly using this trace handle inside the logging function. | |
974 | */ | |
975 | ||
9c67dc50 | 976 | ltt_dump_marker_state(trace); |
9dad1eb8 | 977 | |
b6bf28ec PMF |
978 | //ust// if (!try_module_get(ltt_statedump_owner)) { |
979 | //ust// err = -ENODEV; | |
980 | //ust// printk(KERN_ERR | |
981 | //ust// "LTT : Can't lock state dump module.\n"); | |
982 | //ust// } else { | |
9dad1eb8 | 983 | ltt_statedump_functor(trace); |
b6bf28ec PMF |
984 | //ust// module_put(ltt_statedump_owner); |
985 | //ust// } | |
9dad1eb8 PMF |
986 | |
987 | return err; | |
988 | ||
989 | /* Error handling */ | |
990 | no_trace: | |
991 | ltt_unlock_traces(); | |
992 | return err; | |
993 | } | |
b6bf28ec | 994 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_start); |
9dad1eb8 PMF |
995 | |
996 | /* must be called from within traces lock */ | |
997 | static int _ltt_trace_stop(struct ltt_trace_struct *trace) | |
998 | { | |
999 | int err = -EPERM; | |
1000 | ||
1001 | if (trace == NULL) { | |
1002 | err = -ENOENT; | |
1003 | goto traces_error; | |
1004 | } | |
1005 | if (!trace->active) | |
1006 | printk(KERN_INFO "LTT : Tracing not active for trace %s\n", | |
1007 | trace->trace_name); | |
1008 | if (trace->active) { | |
1009 | trace->active = 0; | |
1010 | ltt_traces.num_active_traces--; | |
b6bf28ec | 1011 | //ust// synchronize_sched(); /* Wait for each tracing to be finished */ |
9dad1eb8 | 1012 | } |
b6bf28ec | 1013 | //ust// module_put(ltt_run_filter_owner); |
9dad1eb8 PMF |
1014 | /* Everything went fine */ |
1015 | return 0; | |
1016 | ||
1017 | /* Error handling */ | |
1018 | traces_error: | |
1019 | return err; | |
1020 | } | |
1021 | ||
1022 | int ltt_trace_stop(const char *trace_name) | |
1023 | { | |
1024 | int err = 0; | |
1025 | struct ltt_trace_struct *trace; | |
1026 | ||
1027 | ltt_lock_traces(); | |
1028 | trace = _ltt_trace_find(trace_name); | |
1029 | err = _ltt_trace_stop(trace); | |
1030 | ltt_unlock_traces(); | |
1031 | return err; | |
1032 | } | |
b6bf28ec | 1033 | //ust// EXPORT_SYMBOL_GPL(ltt_trace_stop); |
9dad1eb8 PMF |
1034 | |
1035 | /** | |
1036 | * ltt_control - Trace control in-kernel API | |
1037 | * @msg: Action to perform | |
1038 | * @trace_name: Trace on which the action must be done | |
1039 | * @trace_type: Type of trace (normal, flight, hybrid) | |
1040 | * @args: Arguments specific to the action | |
1041 | */ | |
b6bf28ec PMF |
1042 | //ust// int ltt_control(enum ltt_control_msg msg, const char *trace_name, |
1043 | //ust// const char *trace_type, union ltt_control_args args) | |
1044 | //ust// { | |
1045 | //ust// int err = -EPERM; | |
1046 | //ust// | |
1047 | //ust// printk(KERN_ALERT "ltt_control : trace %s\n", trace_name); | |
1048 | //ust// switch (msg) { | |
1049 | //ust// case LTT_CONTROL_START: | |
1050 | //ust// printk(KERN_DEBUG "Start tracing %s\n", trace_name); | |
1051 | //ust// err = ltt_trace_start(trace_name); | |
1052 | //ust// break; | |
1053 | //ust// case LTT_CONTROL_STOP: | |
1054 | //ust// printk(KERN_DEBUG "Stop tracing %s\n", trace_name); | |
1055 | //ust// err = ltt_trace_stop(trace_name); | |
1056 | //ust// break; | |
1057 | //ust// case LTT_CONTROL_CREATE_TRACE: | |
1058 | //ust// printk(KERN_DEBUG "Creating trace %s\n", trace_name); | |
1059 | //ust// err = ltt_trace_create(trace_name, trace_type, | |
1060 | //ust// args.new_trace.mode, | |
1061 | //ust// args.new_trace.subbuf_size_low, | |
1062 | //ust// args.new_trace.n_subbufs_low, | |
1063 | //ust// args.new_trace.subbuf_size_med, | |
1064 | //ust// args.new_trace.n_subbufs_med, | |
1065 | //ust// args.new_trace.subbuf_size_high, | |
1066 | //ust// args.new_trace.n_subbufs_high); | |
1067 | //ust// break; | |
1068 | //ust// case LTT_CONTROL_DESTROY_TRACE: | |
1069 | //ust// printk(KERN_DEBUG "Destroying trace %s\n", trace_name); | |
1070 | //ust// err = ltt_trace_destroy(trace_name); | |
1071 | //ust// break; | |
1072 | //ust// } | |
1073 | //ust// return err; | |
1074 | //ust// } | |
1075 | //ust// EXPORT_SYMBOL_GPL(ltt_control); | |
9dad1eb8 PMF |
1076 | |
1077 | /** | |
1078 | * ltt_filter_control - Trace filter control in-kernel API | |
1079 | * @msg: Action to perform on the filter | |
1080 | * @trace_name: Trace on which the action must be done | |
1081 | */ | |
1082 | int ltt_filter_control(enum ltt_filter_control_msg msg, const char *trace_name) | |
1083 | { | |
1084 | int err; | |
1085 | struct ltt_trace_struct *trace; | |
1086 | ||
1087 | printk(KERN_DEBUG "ltt_filter_control : trace %s\n", trace_name); | |
1088 | ltt_lock_traces(); | |
1089 | trace = _ltt_trace_find(trace_name); | |
1090 | if (trace == NULL) { | |
1091 | printk(KERN_ALERT | |
1092 | "Trace does not exist. Cannot proxy control request\n"); | |
1093 | err = -ENOENT; | |
1094 | goto trace_error; | |
1095 | } | |
b6bf28ec PMF |
1096 | //ust// if (!try_module_get(ltt_filter_control_owner)) { |
1097 | //ust// err = -ENODEV; | |
1098 | //ust// goto get_module_error; | |
1099 | //ust// } | |
9dad1eb8 PMF |
1100 | switch (msg) { |
1101 | case LTT_FILTER_DEFAULT_ACCEPT: | |
1102 | printk(KERN_DEBUG | |
1103 | "Proxy filter default accept %s\n", trace_name); | |
1104 | err = (*ltt_filter_control_functor)(msg, trace); | |
1105 | break; | |
1106 | case LTT_FILTER_DEFAULT_REJECT: | |
1107 | printk(KERN_DEBUG | |
1108 | "Proxy filter default reject %s\n", trace_name); | |
1109 | err = (*ltt_filter_control_functor)(msg, trace); | |
1110 | break; | |
1111 | default: | |
1112 | err = -EPERM; | |
1113 | } | |
b6bf28ec | 1114 | //ust// module_put(ltt_filter_control_owner); |
9dad1eb8 | 1115 | |
772030fe | 1116 | //ust// get_module_error: |
9dad1eb8 PMF |
1117 | trace_error: |
1118 | ltt_unlock_traces(); | |
1119 | return err; | |
1120 | } | |
b6bf28ec PMF |
1121 | //ust// EXPORT_SYMBOL_GPL(ltt_filter_control); |
1122 | ||
1123 | //ust// int __init ltt_init(void) | |
1124 | //ust// { | |
1125 | //ust// /* Make sure no page fault can be triggered by this module */ | |
1126 | //ust// vmalloc_sync_all(); | |
1127 | //ust// return 0; | |
1128 | //ust// } | |
1129 | ||
1130 | //ust// module_init(ltt_init) | |
1131 | ||
1132 | //ust// static void __exit ltt_exit(void) | |
1133 | //ust// { | |
1134 | //ust// struct ltt_trace_struct *trace; | |
1135 | //ust// struct list_head *pos, *n; | |
1136 | //ust// | |
1137 | //ust// ltt_lock_traces(); | |
1138 | //ust// /* Stop each trace, currently being read by RCU read-side */ | |
1139 | //ust// list_for_each_entry_rcu(trace, <t_traces.head, list) | |
1140 | //ust// _ltt_trace_stop(trace); | |
1141 | //ust// /* Wait for quiescent state. Readers have preemption disabled. */ | |
1142 | //ust// synchronize_sched(); | |
1143 | //ust// /* Safe iteration is now permitted. It does not have to be RCU-safe | |
1144 | //ust// * because no readers are left. */ | |
1145 | //ust// list_for_each_safe(pos, n, <t_traces.head) { | |
1146 | //ust// trace = container_of(pos, struct ltt_trace_struct, list); | |
1147 | //ust// /* _ltt_trace_destroy does a synchronize_sched() */ | |
1148 | //ust// _ltt_trace_destroy(trace); | |
1149 | //ust// __ltt_trace_destroy(trace); | |
1150 | //ust// } | |
1151 | //ust// /* free traces in pre-alloc status */ | |
1152 | //ust// list_for_each_safe(pos, n, <t_traces.setup_head) { | |
1153 | //ust// trace = container_of(pos, struct ltt_trace_struct, list); | |
1154 | //ust// _ltt_trace_free(trace); | |
1155 | //ust// } | |
1156 | //ust// | |
1157 | //ust// ltt_unlock_traces(); | |
1158 | //ust// } | |
1159 | ||
1160 | //ust// module_exit(ltt_exit) | |
1161 | ||
1162 | //ust// MODULE_LICENSE("GPL"); | |
1163 | //ust// MODULE_AUTHOR("Mathieu Desnoyers"); | |
1164 | //ust// MODULE_DESCRIPTION("Linux Trace Toolkit Next Generation Tracer Kernel API"); |