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