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