1 /*
2  * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
3  *
4  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License (not later!)
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18  *
19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20  */
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <errno.h>
26 
27 #include "../perf.h"
28 #include "util.h"
29 #include "trace-event.h"
30 
31 int header_page_size_size;
32 int header_page_ts_size;
33 int header_page_data_offset;
34 
35 bool latency_format;
36 
37 struct pevent *read_trace_init(int file_bigendian, int host_bigendian)
38 {
39 	struct pevent *pevent = pevent_alloc();
40 
41 	if (pevent != NULL) {
42 		pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
43 		pevent_set_file_bigendian(pevent, file_bigendian);
44 		pevent_set_host_bigendian(pevent, host_bigendian);
45 	}
46 
47 	return pevent;
48 }
49 
50 static int get_common_field(struct scripting_context *context,
51 			    int *offset, int *size, const char *type)
52 {
53 	struct pevent *pevent = context->pevent;
54 	struct event_format *event;
55 	struct format_field *field;
56 
57 	if (!*size) {
58 		if (!pevent->events)
59 			return 0;
60 
61 		event = pevent->events[0];
62 		field = pevent_find_common_field(event, type);
63 		if (!field)
64 			return 0;
65 		*offset = field->offset;
66 		*size = field->size;
67 	}
68 
69 	return pevent_read_number(pevent, context->event_data + *offset, *size);
70 }
71 
72 int common_lock_depth(struct scripting_context *context)
73 {
74 	static int offset;
75 	static int size;
76 	int ret;
77 
78 	ret = get_common_field(context, &size, &offset,
79 			       "common_lock_depth");
80 	if (ret < 0)
81 		return -1;
82 
83 	return ret;
84 }
85 
86 int common_flags(struct scripting_context *context)
87 {
88 	static int offset;
89 	static int size;
90 	int ret;
91 
92 	ret = get_common_field(context, &size, &offset,
93 			       "common_flags");
94 	if (ret < 0)
95 		return -1;
96 
97 	return ret;
98 }
99 
100 int common_pc(struct scripting_context *context)
101 {
102 	static int offset;
103 	static int size;
104 	int ret;
105 
106 	ret = get_common_field(context, &size, &offset,
107 			       "common_preempt_count");
108 	if (ret < 0)
109 		return -1;
110 
111 	return ret;
112 }
113 
114 unsigned long long
115 raw_field_value(struct event_format *event, const char *name, void *data)
116 {
117 	struct format_field *field;
118 	unsigned long long val;
119 
120 	field = pevent_find_any_field(event, name);
121 	if (!field)
122 		return 0ULL;
123 
124 	pevent_read_number_field(field, data, &val);
125 
126 	return val;
127 }
128 
129 void *raw_field_ptr(struct event_format *event, const char *name, void *data)
130 {
131 	struct format_field *field;
132 
133 	field = pevent_find_any_field(event, name);
134 	if (!field)
135 		return NULL;
136 
137 	if (field->flags & FIELD_IS_DYNAMIC) {
138 		int offset;
139 
140 		offset = *(int *)(data + field->offset);
141 		offset &= 0xffff;
142 
143 		return data + offset;
144 	}
145 
146 	return data + field->offset;
147 }
148 
149 int trace_parse_common_type(struct pevent *pevent, void *data)
150 {
151 	struct pevent_record record;
152 
153 	record.data = data;
154 	return pevent_data_type(pevent, &record);
155 }
156 
157 int trace_parse_common_pid(struct pevent *pevent, void *data)
158 {
159 	struct pevent_record record;
160 
161 	record.data = data;
162 	return pevent_data_pid(pevent, &record);
163 }
164 
165 unsigned long long read_size(struct event_format *event, void *ptr, int size)
166 {
167 	return pevent_read_number(event->pevent, ptr, size);
168 }
169 
170 void event_format__print(struct event_format *event,
171 			 int cpu, void *data, int size)
172 {
173 	struct pevent_record record;
174 	struct trace_seq s;
175 
176 	memset(&record, 0, sizeof(record));
177 	record.cpu = cpu;
178 	record.size = size;
179 	record.data = data;
180 
181 	trace_seq_init(&s);
182 	pevent_event_info(&s, event, &record);
183 	trace_seq_do_printf(&s);
184 }
185 
186 void print_trace_event(struct pevent *pevent, int cpu, void *data, int size)
187 {
188 	int type = trace_parse_common_type(pevent, data);
189 	struct event_format *event = pevent_find_event(pevent, type);
190 
191 	if (!event) {
192 		warning("ug! no event found for type %d", type);
193 		return;
194 	}
195 
196 	event_format__print(event, cpu, data, size);
197 }
198 
199 void print_event(struct pevent *pevent, int cpu, void *data, int size,
200 		 unsigned long long nsecs, char *comm)
201 {
202 	struct pevent_record record;
203 	struct trace_seq s;
204 	int pid;
205 
206 	pevent->latency_format = latency_format;
207 
208 	record.ts = nsecs;
209 	record.cpu = cpu;
210 	record.size = size;
211 	record.data = data;
212 	pid = pevent_data_pid(pevent, &record);
213 
214 	if (!pevent_pid_is_registered(pevent, pid))
215 		pevent_register_comm(pevent, comm, pid);
216 
217 	trace_seq_init(&s);
218 	pevent_print_event(pevent, &s, &record);
219 	trace_seq_do_printf(&s);
220 	printf("\n");
221 }
222 
223 void parse_proc_kallsyms(struct pevent *pevent,
224 			 char *file, unsigned int size __maybe_unused)
225 {
226 	unsigned long long addr;
227 	char *func;
228 	char *line;
229 	char *next = NULL;
230 	char *addr_str;
231 	char *mod;
232 	char ch;
233 
234 	line = strtok_r(file, "\n", &next);
235 	while (line) {
236 		mod = NULL;
237 		sscanf(line, "%as %c %as\t[%as",
238 		       (float *)(void *)&addr_str, /* workaround gcc warning */
239 		       &ch, (float *)(void *)&func, (float *)(void *)&mod);
240 		addr = strtoull(addr_str, NULL, 16);
241 		free(addr_str);
242 
243 		/* truncate the extra ']' */
244 		if (mod)
245 			mod[strlen(mod) - 1] = 0;
246 
247 		pevent_register_function(pevent, func, addr, mod);
248 		free(func);
249 		free(mod);
250 
251 		line = strtok_r(NULL, "\n", &next);
252 	}
253 }
254 
255 void parse_ftrace_printk(struct pevent *pevent,
256 			 char *file, unsigned int size __maybe_unused)
257 {
258 	unsigned long long addr;
259 	char *printk;
260 	char *line;
261 	char *next = NULL;
262 	char *addr_str;
263 	char *fmt;
264 
265 	line = strtok_r(file, "\n", &next);
266 	while (line) {
267 		addr_str = strtok_r(line, ":", &fmt);
268 		if (!addr_str) {
269 			warning("printk format with empty entry");
270 			break;
271 		}
272 		addr = strtoull(addr_str, NULL, 16);
273 		/* fmt still has a space, skip it */
274 		printk = strdup(fmt+1);
275 		line = strtok_r(NULL, "\n", &next);
276 		pevent_register_print_string(pevent, printk, addr);
277 	}
278 }
279 
280 int parse_ftrace_file(struct pevent *pevent, char *buf, unsigned long size)
281 {
282 	return pevent_parse_event(pevent, buf, size, "ftrace");
283 }
284 
285 int parse_event_file(struct pevent *pevent,
286 		     char *buf, unsigned long size, char *sys)
287 {
288 	return pevent_parse_event(pevent, buf, size, sys);
289 }
290 
291 struct event_format *trace_find_next_event(struct pevent *pevent,
292 					   struct event_format *event)
293 {
294 	static int idx;
295 
296 	if (!pevent || !pevent->events)
297 		return NULL;
298 
299 	if (!event) {
300 		idx = 0;
301 		return pevent->events[0];
302 	}
303 
304 	if (idx < pevent->nr_events && event == pevent->events[idx]) {
305 		idx++;
306 		if (idx == pevent->nr_events)
307 			return NULL;
308 		return pevent->events[idx];
309 	}
310 
311 	for (idx = 1; idx < pevent->nr_events; idx++) {
312 		if (event == pevent->events[idx - 1])
313 			return pevent->events[idx];
314 	}
315 	return NULL;
316 }
317 
318 struct flag {
319 	const char *name;
320 	unsigned long long value;
321 };
322 
323 static const struct flag flags[] = {
324 	{ "HI_SOFTIRQ", 0 },
325 	{ "TIMER_SOFTIRQ", 1 },
326 	{ "NET_TX_SOFTIRQ", 2 },
327 	{ "NET_RX_SOFTIRQ", 3 },
328 	{ "BLOCK_SOFTIRQ", 4 },
329 	{ "BLOCK_IOPOLL_SOFTIRQ", 5 },
330 	{ "TASKLET_SOFTIRQ", 6 },
331 	{ "SCHED_SOFTIRQ", 7 },
332 	{ "HRTIMER_SOFTIRQ", 8 },
333 	{ "RCU_SOFTIRQ", 9 },
334 
335 	{ "HRTIMER_NORESTART", 0 },
336 	{ "HRTIMER_RESTART", 1 },
337 };
338 
339 unsigned long long eval_flag(const char *flag)
340 {
341 	int i;
342 
343 	/*
344 	 * Some flags in the format files do not get converted.
345 	 * If the flag is not numeric, see if it is something that
346 	 * we already know about.
347 	 */
348 	if (isdigit(flag[0]))
349 		return strtoull(flag, NULL, 0);
350 
351 	for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
352 		if (strcmp(flags[i].name, flag) == 0)
353 			return flags[i].value;
354 
355 	return 0;
356 }
357