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 <errno.h>
25 
26 #include "../perf.h"
27 #include "debug.h"
28 #include "trace-event.h"
29 
30 #include "sane_ctype.h"
31 
32 static int get_common_field(struct scripting_context *context,
33 			    int *offset, int *size, const char *type)
34 {
35 	struct pevent *pevent = context->pevent;
36 	struct event_format *event;
37 	struct format_field *field;
38 
39 	if (!*size) {
40 		if (!pevent->events)
41 			return 0;
42 
43 		event = pevent->events[0];
44 		field = pevent_find_common_field(event, type);
45 		if (!field)
46 			return 0;
47 		*offset = field->offset;
48 		*size = field->size;
49 	}
50 
51 	return pevent_read_number(pevent, context->event_data + *offset, *size);
52 }
53 
54 int common_lock_depth(struct scripting_context *context)
55 {
56 	static int offset;
57 	static int size;
58 	int ret;
59 
60 	ret = get_common_field(context, &size, &offset,
61 			       "common_lock_depth");
62 	if (ret < 0)
63 		return -1;
64 
65 	return ret;
66 }
67 
68 int common_flags(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_flags");
76 	if (ret < 0)
77 		return -1;
78 
79 	return ret;
80 }
81 
82 int common_pc(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_preempt_count");
90 	if (ret < 0)
91 		return -1;
92 
93 	return ret;
94 }
95 
96 unsigned long long
97 raw_field_value(struct event_format *event, const char *name, void *data)
98 {
99 	struct format_field *field;
100 	unsigned long long val;
101 
102 	field = pevent_find_any_field(event, name);
103 	if (!field)
104 		return 0ULL;
105 
106 	pevent_read_number_field(field, data, &val);
107 
108 	return val;
109 }
110 
111 unsigned long long read_size(struct event_format *event, void *ptr, int size)
112 {
113 	return pevent_read_number(event->pevent, ptr, size);
114 }
115 
116 void event_format__fprintf(struct event_format *event,
117 			   int cpu, void *data, int size, FILE *fp)
118 {
119 	struct pevent_record record;
120 	struct trace_seq s;
121 
122 	memset(&record, 0, sizeof(record));
123 	record.cpu = cpu;
124 	record.size = size;
125 	record.data = data;
126 
127 	trace_seq_init(&s);
128 	pevent_event_info(&s, event, &record);
129 	trace_seq_do_fprintf(&s, fp);
130 	trace_seq_destroy(&s);
131 }
132 
133 void event_format__print(struct event_format *event,
134 			 int cpu, void *data, int size)
135 {
136 	return event_format__fprintf(event, cpu, data, size, stdout);
137 }
138 
139 void parse_ftrace_printk(struct pevent *pevent,
140 			 char *file, unsigned int size __maybe_unused)
141 {
142 	unsigned long long addr;
143 	char *printk;
144 	char *line;
145 	char *next = NULL;
146 	char *addr_str;
147 	char *fmt = NULL;
148 
149 	line = strtok_r(file, "\n", &next);
150 	while (line) {
151 		addr_str = strtok_r(line, ":", &fmt);
152 		if (!addr_str) {
153 			pr_warning("printk format with empty entry");
154 			break;
155 		}
156 		addr = strtoull(addr_str, NULL, 16);
157 		/* fmt still has a space, skip it */
158 		printk = strdup(fmt+1);
159 		line = strtok_r(NULL, "\n", &next);
160 		pevent_register_print_string(pevent, printk, addr);
161 	}
162 }
163 
164 void parse_saved_cmdline(struct pevent *pevent,
165 			 char *file, unsigned int size __maybe_unused)
166 {
167 	char *comm;
168 	char *line;
169 	char *next = NULL;
170 	int pid;
171 
172 	line = strtok_r(file, "\n", &next);
173 	while (line) {
174 		sscanf(line, "%d %ms", &pid, &comm);
175 		pevent_register_comm(pevent, comm, pid);
176 		free(comm);
177 		line = strtok_r(NULL, "\n", &next);
178 	}
179 }
180 
181 int parse_ftrace_file(struct pevent *pevent, char *buf, unsigned long size)
182 {
183 	return pevent_parse_event(pevent, buf, size, "ftrace");
184 }
185 
186 int parse_event_file(struct pevent *pevent,
187 		     char *buf, unsigned long size, char *sys)
188 {
189 	return pevent_parse_event(pevent, buf, size, sys);
190 }
191 
192 struct event_format *trace_find_next_event(struct pevent *pevent,
193 					   struct event_format *event)
194 {
195 	static int idx;
196 
197 	if (!pevent || !pevent->events)
198 		return NULL;
199 
200 	if (!event) {
201 		idx = 0;
202 		return pevent->events[0];
203 	}
204 
205 	if (idx < pevent->nr_events && event == pevent->events[idx]) {
206 		idx++;
207 		if (idx == pevent->nr_events)
208 			return NULL;
209 		return pevent->events[idx];
210 	}
211 
212 	for (idx = 1; idx < pevent->nr_events; idx++) {
213 		if (event == pevent->events[idx - 1])
214 			return pevent->events[idx];
215 	}
216 	return NULL;
217 }
218 
219 struct flag {
220 	const char *name;
221 	unsigned long long value;
222 };
223 
224 static const struct flag flags[] = {
225 	{ "HI_SOFTIRQ", 0 },
226 	{ "TIMER_SOFTIRQ", 1 },
227 	{ "NET_TX_SOFTIRQ", 2 },
228 	{ "NET_RX_SOFTIRQ", 3 },
229 	{ "BLOCK_SOFTIRQ", 4 },
230 	{ "IRQ_POLL_SOFTIRQ", 5 },
231 	{ "TASKLET_SOFTIRQ", 6 },
232 	{ "SCHED_SOFTIRQ", 7 },
233 	{ "HRTIMER_SOFTIRQ", 8 },
234 	{ "RCU_SOFTIRQ", 9 },
235 
236 	{ "HRTIMER_NORESTART", 0 },
237 	{ "HRTIMER_RESTART", 1 },
238 };
239 
240 unsigned long long eval_flag(const char *flag)
241 {
242 	int i;
243 
244 	/*
245 	 * Some flags in the format files do not get converted.
246 	 * If the flag is not numeric, see if it is something that
247 	 * we already know about.
248 	 */
249 	if (isdigit(flag[0]))
250 		return strtoull(flag, NULL, 0);
251 
252 	for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
253 		if (strcmp(flags[i].name, flag) == 0)
254 			return flags[i].value;
255 
256 	return 0;
257 }
258