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 bool latency_format;
32 
33 struct pevent *read_trace_init(int file_bigendian, int host_bigendian)
34 {
35 	struct pevent *pevent = pevent_alloc();
36 
37 	if (pevent != NULL) {
38 		pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
39 		pevent_set_file_bigendian(pevent, file_bigendian);
40 		pevent_set_host_bigendian(pevent, host_bigendian);
41 	}
42 
43 	return pevent;
44 }
45 
46 static int get_common_field(struct scripting_context *context,
47 			    int *offset, int *size, const char *type)
48 {
49 	struct pevent *pevent = context->pevent;
50 	struct event_format *event;
51 	struct format_field *field;
52 
53 	if (!*size) {
54 		if (!pevent->events)
55 			return 0;
56 
57 		event = pevent->events[0];
58 		field = pevent_find_common_field(event, type);
59 		if (!field)
60 			return 0;
61 		*offset = field->offset;
62 		*size = field->size;
63 	}
64 
65 	return pevent_read_number(pevent, context->event_data + *offset, *size);
66 }
67 
68 int common_lock_depth(struct scripting_context *context)
69 {
70 	static int offset;
71 	static int size;
72 	int ret;
73 
74 	ret = get_common_field(context, &size, &offset,
75 			       "common_lock_depth");
76 	if (ret < 0)
77 		return -1;
78 
79 	return ret;
80 }
81 
82 int common_flags(struct scripting_context *context)
83 {
84 	static int offset;
85 	static int size;
86 	int ret;
87 
88 	ret = get_common_field(context, &size, &offset,
89 			       "common_flags");
90 	if (ret < 0)
91 		return -1;
92 
93 	return ret;
94 }
95 
96 int common_pc(struct scripting_context *context)
97 {
98 	static int offset;
99 	static int size;
100 	int ret;
101 
102 	ret = get_common_field(context, &size, &offset,
103 			       "common_preempt_count");
104 	if (ret < 0)
105 		return -1;
106 
107 	return ret;
108 }
109 
110 unsigned long long
111 raw_field_value(struct event_format *event, const char *name, void *data)
112 {
113 	struct format_field *field;
114 	unsigned long long val;
115 
116 	field = pevent_find_any_field(event, name);
117 	if (!field)
118 		return 0ULL;
119 
120 	pevent_read_number_field(field, data, &val);
121 
122 	return val;
123 }
124 
125 void *raw_field_ptr(struct event_format *event, const char *name, void *data)
126 {
127 	struct format_field *field;
128 
129 	field = pevent_find_any_field(event, name);
130 	if (!field)
131 		return NULL;
132 
133 	if (field->flags & FIELD_IS_DYNAMIC) {
134 		int offset;
135 
136 		offset = *(int *)(data + field->offset);
137 		offset &= 0xffff;
138 
139 		return data + offset;
140 	}
141 
142 	return data + field->offset;
143 }
144 
145 int trace_parse_common_type(struct pevent *pevent, void *data)
146 {
147 	struct pevent_record record;
148 
149 	record.data = data;
150 	return pevent_data_type(pevent, &record);
151 }
152 
153 int trace_parse_common_pid(struct pevent *pevent, void *data)
154 {
155 	struct pevent_record record;
156 
157 	record.data = data;
158 	return pevent_data_pid(pevent, &record);
159 }
160 
161 unsigned long long read_size(struct event_format *event, void *ptr, int size)
162 {
163 	return pevent_read_number(event->pevent, ptr, size);
164 }
165 
166 void event_format__print(struct event_format *event,
167 			 int cpu, void *data, int size)
168 {
169 	struct pevent_record record;
170 	struct trace_seq s;
171 
172 	memset(&record, 0, sizeof(record));
173 	record.cpu = cpu;
174 	record.size = size;
175 	record.data = data;
176 
177 	trace_seq_init(&s);
178 	pevent_event_info(&s, event, &record);
179 	trace_seq_do_printf(&s);
180 }
181 
182 void parse_proc_kallsyms(struct pevent *pevent,
183 			 char *file, unsigned int size __maybe_unused)
184 {
185 	unsigned long long addr;
186 	char *func;
187 	char *line;
188 	char *next = NULL;
189 	char *addr_str;
190 	char *mod;
191 	char *fmt;
192 
193 	line = strtok_r(file, "\n", &next);
194 	while (line) {
195 		mod = NULL;
196 		addr_str = strtok_r(line, " ", &fmt);
197 		addr = strtoull(addr_str, NULL, 16);
198 		/* skip character */
199 		strtok_r(NULL, " ", &fmt);
200 		func = strtok_r(NULL, "\t", &fmt);
201 		mod = strtok_r(NULL, "]", &fmt);
202 		/* truncate the extra '[' */
203 		if (mod)
204 			mod = mod + 1;
205 
206 		pevent_register_function(pevent, func, addr, mod);
207 
208 		line = strtok_r(NULL, "\n", &next);
209 	}
210 }
211 
212 void parse_ftrace_printk(struct pevent *pevent,
213 			 char *file, unsigned int size __maybe_unused)
214 {
215 	unsigned long long addr;
216 	char *printk;
217 	char *line;
218 	char *next = NULL;
219 	char *addr_str;
220 	char *fmt;
221 
222 	line = strtok_r(file, "\n", &next);
223 	while (line) {
224 		addr_str = strtok_r(line, ":", &fmt);
225 		if (!addr_str) {
226 			warning("printk format with empty entry");
227 			break;
228 		}
229 		addr = strtoull(addr_str, NULL, 16);
230 		/* fmt still has a space, skip it */
231 		printk = strdup(fmt+1);
232 		line = strtok_r(NULL, "\n", &next);
233 		pevent_register_print_string(pevent, printk, addr);
234 	}
235 }
236 
237 int parse_ftrace_file(struct pevent *pevent, char *buf, unsigned long size)
238 {
239 	return pevent_parse_event(pevent, buf, size, "ftrace");
240 }
241 
242 int parse_event_file(struct pevent *pevent,
243 		     char *buf, unsigned long size, char *sys)
244 {
245 	return pevent_parse_event(pevent, buf, size, sys);
246 }
247 
248 struct event_format *trace_find_next_event(struct pevent *pevent,
249 					   struct event_format *event)
250 {
251 	static int idx;
252 
253 	if (!pevent || !pevent->events)
254 		return NULL;
255 
256 	if (!event) {
257 		idx = 0;
258 		return pevent->events[0];
259 	}
260 
261 	if (idx < pevent->nr_events && event == pevent->events[idx]) {
262 		idx++;
263 		if (idx == pevent->nr_events)
264 			return NULL;
265 		return pevent->events[idx];
266 	}
267 
268 	for (idx = 1; idx < pevent->nr_events; idx++) {
269 		if (event == pevent->events[idx - 1])
270 			return pevent->events[idx];
271 	}
272 	return NULL;
273 }
274 
275 struct flag {
276 	const char *name;
277 	unsigned long long value;
278 };
279 
280 static const struct flag flags[] = {
281 	{ "HI_SOFTIRQ", 0 },
282 	{ "TIMER_SOFTIRQ", 1 },
283 	{ "NET_TX_SOFTIRQ", 2 },
284 	{ "NET_RX_SOFTIRQ", 3 },
285 	{ "BLOCK_SOFTIRQ", 4 },
286 	{ "BLOCK_IOPOLL_SOFTIRQ", 5 },
287 	{ "TASKLET_SOFTIRQ", 6 },
288 	{ "SCHED_SOFTIRQ", 7 },
289 	{ "HRTIMER_SOFTIRQ", 8 },
290 	{ "RCU_SOFTIRQ", 9 },
291 
292 	{ "HRTIMER_NORESTART", 0 },
293 	{ "HRTIMER_RESTART", 1 },
294 };
295 
296 unsigned long long eval_flag(const char *flag)
297 {
298 	int i;
299 
300 	/*
301 	 * Some flags in the format files do not get converted.
302 	 * If the flag is not numeric, see if it is something that
303 	 * we already know about.
304 	 */
305 	if (isdigit(flag[0]))
306 		return strtoull(flag, NULL, 0);
307 
308 	for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
309 		if (strcmp(flags[i].name, flag) == 0)
310 			return flags[i].value;
311 
312 	return 0;
313 }
314