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a72ca31a PMF |
1 | /* |
2 | * Code markup for dynamic and static tracing. | |
3 | * | |
4 | * See Documentation/marker.txt. | |
5 | * | |
6 | * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
59b161cd | 7 | * (C) Copyright 2009 Pierre-Marc Fournier <pierre-marc dot fournier at polymtl dot ca> |
a72ca31a | 8 | * |
8fc2d8db PMF |
9 | * This library is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
a72ca31a PMF |
22 | */ |
23 | ||
2288bf6d PMF |
24 | #ifndef _UST_MARKER_H |
25 | #define _UST_MARKER_H | |
e4621c7f | 26 | |
a72ca31a | 27 | #include <stdarg.h> |
59b161cd | 28 | //ust// #include <linux/types.h> |
93d0f2ea | 29 | #include <ust/immediate.h> |
59b161cd | 30 | //ust// #include <linux/ltt-channels.h> |
fbca6b62 | 31 | #include <ust/kernelcompat.h> |
769d0157 | 32 | #include <kcompat/list.h> |
2782fc4b | 33 | #include <ust/processor.h> |
59b161cd PMF |
34 | |
35 | //ust// struct module; | |
36 | //ust// struct task_struct; | |
a72ca31a PMF |
37 | struct marker; |
38 | ||
a4db742a PMF |
39 | /* To stringify the expansion of a define */ |
40 | #define XSTR(d) STR(d) | |
41 | #define STR(s) #s | |
42 | ||
a72ca31a PMF |
43 | /** |
44 | * marker_probe_func - Type of a marker probe function | |
45 | * @mdata: marker data | |
46 | * @probe_private: probe private data | |
47 | * @call_private: call site private data | |
48 | * @fmt: format string | |
49 | * @args: variable argument list pointer. Use a pointer to overcome C's | |
50 | * inability to pass this around as a pointer in a portable manner in | |
51 | * the callee otherwise. | |
52 | * | |
53 | * Type of marker probe functions. They receive the mdata and need to parse the | |
54 | * format string to recover the variable argument list. | |
55 | */ | |
56 | typedef void marker_probe_func(const struct marker *mdata, | |
75667d04 | 57 | void *probe_private, struct registers *regs, void *call_private, |
a72ca31a PMF |
58 | const char *fmt, va_list *args); |
59 | ||
60 | struct marker_probe_closure { | |
61 | marker_probe_func *func; /* Callback */ | |
62 | void *probe_private; /* Private probe data */ | |
63 | }; | |
64 | ||
65 | struct marker { | |
66 | const char *channel; /* Name of channel where to send data */ | |
67 | const char *name; /* Marker name */ | |
68 | const char *format; /* Marker format string, describing the | |
69 | * variable argument list. | |
70 | */ | |
59b161cd | 71 | DEFINE_IMV(char, state);/* Immediate value state. */ |
a72ca31a PMF |
72 | char ptype; /* probe type : 0 : single, 1 : multi */ |
73 | /* Probe wrapper */ | |
74 | u16 channel_id; /* Numeric channel identifier, dynamic */ | |
75 | u16 event_id; /* Numeric event identifier, dynamic */ | |
75667d04 | 76 | void (*call)(const struct marker *mdata, void *call_private, struct registers *regs, ...); |
a72ca31a PMF |
77 | struct marker_probe_closure single; |
78 | struct marker_probe_closure *multi; | |
79 | const char *tp_name; /* Optional tracepoint name */ | |
80 | void *tp_cb; /* Optional tracepoint callback */ | |
3ea1e2fc | 81 | void *location; /* Address of marker in code */ |
a72ca31a PMF |
82 | } __attribute__((aligned(8))); |
83 | ||
872037bb PMF |
84 | #define CONFIG_MARKERS |
85 | #ifdef CONFIG_MARKERS | |
a72ca31a | 86 | |
a4db742a PMF |
87 | #define _DEFINE_MARKER(channel, name, tp_name_str, tp_cb, format, unique) \ |
88 | static const char __old_mstrtab_##channel##_##name[] \ | |
89 | __attribute__((section("__old_markers_strings"))) \ | |
90 | = #channel "\0" #name "\0" format; \ | |
91 | struct registers regs; \ | |
92 | static struct marker *__pmark_##channel##_##name; \ | |
93 | static struct marker __old_mark_##channel##_##name \ | |
94 | __attribute__((section("__old_markers"), aligned(8))) = \ | |
95 | { __old_mstrtab_##channel##_##name, \ | |
96 | &__old_mstrtab_##channel##_##name[sizeof(#channel)], \ | |
97 | &__old_mstrtab_##channel##_##name[sizeof(#channel) + \ | |
98 | sizeof(#name)], \ | |
99 | 0, 0, 0, 0, marker_probe_cb, \ | |
100 | { __mark_empty_function, NULL}, \ | |
101 | NULL, tp_name_str, tp_cb, NULL }; \ | |
102 | \ | |
103 | /* This next asm has to be a basic inline asm (no input/output/clobber), \ | |
443addf6 PMF |
104 | because it must not require %-sign escaping, as we most certainly \ |
105 | have some %-signs in the format string. */ \ | |
a4db742a PMF |
106 | asm volatile ( \ |
107 | ".section __markers_strings,\"aw\",@progbits\n\t" \ | |
a4db742a PMF |
108 | "__mstrtab_" XSTR(channel) "_" XSTR(name) "_channel_" XSTR(unique) ":\n\t" \ |
109 | ".string \"" XSTR(channel) "\"\n\t" \ | |
110 | "__mstrtab_" XSTR(channel) "_" XSTR(name) "_name_" XSTR(unique) ":\n\t" \ | |
111 | ".string \"" XSTR(name) "\"\n\t" \ | |
112 | "__mstrtab_" XSTR(channel) "_" XSTR(name) "_format_" XSTR(unique) ":\n\t" \ | |
113 | ".string " XSTR(format) "\n\t" \ | |
114 | ".previous\n\t" \ | |
115 | ".section __markers,\"aw\",@progbits\n\t" \ | |
116 | ".align 8\n\t" \ | |
6b68d79d PMF |
117 | "__mark_struct_" XSTR(unique) ":\n\t" \ |
118 | _ASM_PTR "(__mstrtab_" XSTR(channel) "_" XSTR(name) "_channel_" XSTR(unique) ")\n\t" /* channel string */ \ | |
119 | _ASM_PTR "(__mstrtab_" XSTR(channel) "_" XSTR(name) "_name_" XSTR(unique) ")\n\t" /* name string */ \ | |
120 | _ASM_PTR "(__mstrtab_" XSTR(channel) "_" XSTR(name) "_format_" XSTR(unique) ")\n\t" /* format string */ \ | |
6793a8bf PMF |
121 | ".byte 0\n\t" /* state imv */ \ |
122 | ".byte 0\n\t" /* ptype */ \ | |
123 | ".word 0\n\t" /* channel_id */ \ | |
124 | ".word 0\n\t" /* event_id */ \ | |
125 | ".align " XSTR(__SIZEOF_POINTER__) "\n\t" /* alignment */ \ | |
126 | _ASM_PTR "(marker_probe_cb)\n\t" /* call */ \ | |
6b68d79d | 127 | _ASM_PTR "(__mark_empty_function)\n\t" /* marker_probe_closure single.field1 */ \ |
6793a8bf PMF |
128 | _ASM_PTR "0\n\t" /* marker_probe_closure single.field2 */ \ |
129 | _ASM_PTR "0\n\t" /* marker_probe_closure *multi */ \ | |
130 | _ASM_PTR "0\n\t" /* tp_name */ \ | |
131 | _ASM_PTR "0\n\t" /* tp_cb */ \ | |
132 | "__mark_location_" XSTR(unique) ":\n\t" \ | |
133 | _ASM_PTR "(1f)\n\t" /* location */ \ | |
134 | ".previous\n\t" \ | |
135 | "1:\n\t" \ | |
136 | ); \ | |
a4db742a | 137 | asm volatile ( \ |
6b68d79d PMF |
138 | "mov ""$__mark_struct_" XSTR(unique) ", %[pmark_struct]\n\t" \ |
139 | : [pmark_struct] "=r" (__pmark_##channel##_##name) :: "memory" \ | |
a4db742a PMF |
140 | ); \ |
141 | \ | |
3ea1e2fc PMF |
142 | save_registers(®s) |
143 | ||
144 | ||
a72ca31a | 145 | #define DEFINE_MARKER(channel, name, format) \ |
a4db742a | 146 | _DEFINE_MARKER(channel, name, NULL, NULL, format, __COUNTER__) |
a72ca31a PMF |
147 | |
148 | #define DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format) \ | |
a4db742a | 149 | _DEFINE_MARKER(channel, name, #tp_name, tp_cb, format, __COUNTER__) |
a72ca31a PMF |
150 | |
151 | /* | |
152 | * Make sure the alignment of the structure in the __markers section will | |
153 | * not add unwanted padding between the beginning of the section and the | |
154 | * structure. Force alignment to the same alignment as the section start. | |
155 | * | |
156 | * The "generic" argument controls which marker enabling mechanism must be used. | |
157 | * If generic is true, a variable read is used. | |
158 | * If generic is false, immediate values are used. | |
159 | */ | |
160 | #define __trace_mark(generic, channel, name, call_private, format, args...) \ | |
161 | do { \ | |
162 | DEFINE_MARKER(channel, name, format); \ | |
163 | __mark_check_format(format, ## args); \ | |
164 | if (!generic) { \ | |
165 | if (unlikely(imv_read( \ | |
a4db742a PMF |
166 | __pmark_##channel##_##name->state))) \ |
167 | (*__pmark_##channel##_##name->call) \ | |
168 | (__pmark_##channel##_##name, \ | |
75667d04 | 169 | call_private, ®s, ## args); \ |
a72ca31a PMF |
170 | } else { \ |
171 | if (unlikely(_imv_read( \ | |
a4db742a PMF |
172 | __pmark_##channel##_##name->state))) \ |
173 | (__pmark_##channel##_##name->call) \ | |
174 | (__pmark_##channel##_##name, \ | |
75667d04 | 175 | call_private, ®s, ## args); \ |
a72ca31a PMF |
176 | } \ |
177 | } while (0) | |
178 | ||
179 | #define __trace_mark_tp(channel, name, call_private, tp_name, tp_cb, \ | |
180 | format, args...) \ | |
181 | do { \ | |
182 | void __check_tp_type(void) \ | |
183 | { \ | |
184 | register_trace_##tp_name(tp_cb); \ | |
185 | } \ | |
186 | DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format);\ | |
187 | __mark_check_format(format, ## args); \ | |
188 | (*__mark_##channel##_##name.call)(&__mark_##channel##_##name, \ | |
75667d04 | 189 | call_private, ®s, ## args); \ |
a72ca31a PMF |
190 | } while (0) |
191 | ||
192 | extern void marker_update_probe_range(struct marker *begin, | |
193 | struct marker *end); | |
194 | ||
195 | #define GET_MARKER(channel, name) (__mark_##channel##_##name) | |
196 | ||
872037bb PMF |
197 | #else /* !CONFIG_MARKERS */ |
198 | #define DEFINE_MARKER(channel, name, tp_name, tp_cb, format) | |
199 | #define __trace_mark(generic, channel, name, call_private, format, args...) \ | |
200 | __mark_check_format(format, ## args) | |
201 | #define __trace_mark_tp(channel, name, call_private, tp_name, tp_cb, \ | |
202 | format, args...) \ | |
203 | do { \ | |
204 | void __check_tp_type(void) \ | |
205 | { \ | |
206 | register_trace_##tp_name(tp_cb); \ | |
207 | } \ | |
208 | __mark_check_format(format, ## args); \ | |
209 | } while (0) | |
210 | static inline void marker_update_probe_range(struct marker *begin, | |
211 | struct marker *end) | |
212 | { } | |
213 | #define GET_MARKER(channel, name) | |
214 | #endif /* CONFIG_MARKERS */ | |
a72ca31a PMF |
215 | |
216 | /** | |
217 | * trace_mark - Marker using code patching | |
218 | * @channel: marker channel (where to send the data), not quoted. | |
219 | * @name: marker name, not quoted. | |
220 | * @format: format string | |
221 | * @args...: variable argument list | |
222 | * | |
223 | * Places a marker using optimized code patching technique (imv_read()) | |
224 | * to be enabled when immediate values are present. | |
225 | */ | |
226 | #define trace_mark(channel, name, format, args...) \ | |
227 | __trace_mark(0, channel, name, NULL, format, ## args) | |
228 | ||
229 | /** | |
230 | * _trace_mark - Marker using variable read | |
231 | * @channel: marker channel (where to send the data), not quoted. | |
232 | * @name: marker name, not quoted. | |
233 | * @format: format string | |
234 | * @args...: variable argument list | |
235 | * | |
236 | * Places a marker using a standard memory read (_imv_read()) to be | |
237 | * enabled. Should be used for markers in code paths where instruction | |
238 | * modification based enabling is not welcome. (__init and __exit functions, | |
239 | * lockdep, some traps, printk). | |
240 | */ | |
241 | #define _trace_mark(channel, name, format, args...) \ | |
242 | __trace_mark(1, channel, name, NULL, format, ## args) | |
243 | ||
244 | /** | |
245 | * trace_mark_tp - Marker in a tracepoint callback | |
246 | * @channel: marker channel (where to send the data), not quoted. | |
247 | * @name: marker name, not quoted. | |
248 | * @tp_name: tracepoint name, not quoted. | |
249 | * @tp_cb: tracepoint callback. Should have an associated global symbol so it | |
250 | * is not optimized away by the compiler (should not be static). | |
251 | * @format: format string | |
252 | * @args...: variable argument list | |
253 | * | |
254 | * Places a marker in a tracepoint callback. | |
255 | */ | |
256 | #define trace_mark_tp(channel, name, tp_name, tp_cb, format, args...) \ | |
257 | __trace_mark_tp(channel, name, NULL, tp_name, tp_cb, format, ## args) | |
258 | ||
259 | /** | |
260 | * MARK_NOARGS - Format string for a marker with no argument. | |
261 | */ | |
262 | #define MARK_NOARGS " " | |
263 | ||
264 | extern void lock_markers(void); | |
265 | extern void unlock_markers(void); | |
266 | ||
267 | extern void markers_compact_event_ids(void); | |
268 | ||
269 | /* To be used for string format validity checking with gcc */ | |
270 | static inline void __printf(1, 2) ___mark_check_format(const char *fmt, ...) | |
271 | { | |
272 | } | |
273 | ||
274 | #define __mark_check_format(format, args...) \ | |
275 | do { \ | |
276 | if (0) \ | |
277 | ___mark_check_format(format, ## args); \ | |
278 | } while (0) | |
279 | ||
280 | extern marker_probe_func __mark_empty_function; | |
281 | ||
282 | extern void marker_probe_cb(const struct marker *mdata, | |
75667d04 | 283 | void *call_private, struct registers *regs, ...); |
a72ca31a PMF |
284 | |
285 | /* | |
286 | * Connect a probe to a marker. | |
287 | * private data pointer must be a valid allocated memory address, or NULL. | |
288 | */ | |
289 | extern int marker_probe_register(const char *channel, const char *name, | |
290 | const char *format, marker_probe_func *probe, void *probe_private); | |
291 | ||
292 | /* | |
293 | * Returns the private data given to marker_probe_register. | |
294 | */ | |
295 | extern int marker_probe_unregister(const char *channel, const char *name, | |
296 | marker_probe_func *probe, void *probe_private); | |
297 | /* | |
298 | * Unregister a marker by providing the registered private data. | |
299 | */ | |
300 | extern int marker_probe_unregister_private_data(marker_probe_func *probe, | |
301 | void *probe_private); | |
302 | ||
303 | extern void *marker_get_private_data(const char *channel, const char *name, | |
304 | marker_probe_func *probe, int num); | |
305 | ||
306 | /* | |
307 | * marker_synchronize_unregister must be called between the last marker probe | |
308 | * unregistration and the first one of | |
309 | * - the end of module exit function | |
310 | * - the free of any resource used by the probes | |
311 | * to ensure the code and data are valid for any possibly running probes. | |
312 | */ | |
313 | #define marker_synchronize_unregister() synchronize_sched() | |
314 | ||
315 | struct marker_iter { | |
98963de4 PMF |
316 | //ust// struct module *module; |
317 | struct lib *lib; | |
a72ca31a PMF |
318 | struct marker *marker; |
319 | }; | |
320 | ||
321 | extern void marker_iter_start(struct marker_iter *iter); | |
322 | extern void marker_iter_next(struct marker_iter *iter); | |
323 | extern void marker_iter_stop(struct marker_iter *iter); | |
324 | extern void marker_iter_reset(struct marker_iter *iter); | |
325 | extern int marker_get_iter_range(struct marker **marker, struct marker *begin, | |
326 | struct marker *end); | |
327 | ||
328 | extern void marker_update_process(void); | |
329 | extern int is_marker_enabled(const char *channel, const char *name); | |
330 | ||
59b161cd PMF |
331 | //ust// #ifdef CONFIG_MARKERS_USERSPACE |
332 | //ust// extern void exit_user_markers(struct task_struct *p); | |
333 | //ust// #else | |
334 | //ust// static inline void exit_user_markers(struct task_struct *p) | |
335 | //ust// { | |
336 | //ust// } | |
337 | //ust// #endif | |
a72ca31a | 338 | |
3ea1e2fc PMF |
339 | struct marker_addr { |
340 | struct marker *marker; | |
341 | void *addr; | |
342 | }; | |
98963de4 PMF |
343 | |
344 | struct lib { | |
345 | struct marker *markers_start; | |
defa46a7 | 346 | #ifdef CONFIG_UST_GDB_INTEGRATION |
3ea1e2fc | 347 | struct marker_addr *markers_addr_start; |
defa46a7 | 348 | #endif |
98963de4 PMF |
349 | int markers_count; |
350 | struct list_head list; | |
351 | }; | |
352 | ||
bf961c7e | 353 | extern int marker_register_lib(struct marker *markers_start, int markers_count); |
defa46a7 | 354 | |
55994a67 JB |
355 | #define MARKER_LIB \ |
356 | extern struct marker __start___markers[] __attribute__((weak, visibility("hidden"))); \ | |
357 | extern struct marker __stop___markers[] __attribute__((weak, visibility("hidden"))); \ | |
55994a67 JB |
358 | \ |
359 | static void __attribute__((constructor)) __markers__init(void) \ | |
360 | { \ | |
bf961c7e | 361 | marker_register_lib(__start___markers, (((long)__stop___markers)-((long)__start___markers))/sizeof(struct marker)); \ |
55994a67 | 362 | } |
98963de4 | 363 | |
064842c6 PMF |
364 | extern void marker_set_new_marker_cb(void (*cb)(struct marker *)); |
365 | extern void init_markers(void); | |
9160b4e4 | 366 | |
defa46a7 | 367 | #endif /* _UST_MARKER_H */ |