1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
4  */
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <string.h>
8 #include <errno.h>
9 
10 #include "debug.h"
11 #include "trace-event.h"
12 
13 #include <linux/ctype.h>
14 #include <linux/kernel.h>
15 #include <traceevent/event-parse.h>
16 
17 static int get_common_field(struct scripting_context *context,
18 			    int *offset, int *size, const char *type)
19 {
20 	struct tep_handle *pevent = context->pevent;
21 	struct tep_event *event;
22 	struct tep_format_field *field;
23 
24 	if (!*size) {
25 
26 		event = tep_get_first_event(pevent);
27 		if (!event)
28 			return 0;
29 
30 		field = tep_find_common_field(event, type);
31 		if (!field)
32 			return 0;
33 		*offset = field->offset;
34 		*size = field->size;
35 	}
36 
37 	return tep_read_number(pevent, context->event_data + *offset, *size);
38 }
39 
40 int common_lock_depth(struct scripting_context *context)
41 {
42 	static int offset;
43 	static int size;
44 	int ret;
45 
46 	ret = get_common_field(context, &size, &offset,
47 			       "common_lock_depth");
48 	if (ret < 0)
49 		return -1;
50 
51 	return ret;
52 }
53 
54 int common_flags(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_flags");
62 	if (ret < 0)
63 		return -1;
64 
65 	return ret;
66 }
67 
68 int common_pc(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_preempt_count");
76 	if (ret < 0)
77 		return -1;
78 
79 	return ret;
80 }
81 
82 unsigned long long
83 raw_field_value(struct tep_event *event, const char *name, void *data)
84 {
85 	struct tep_format_field *field;
86 	unsigned long long val;
87 
88 	field = tep_find_any_field(event, name);
89 	if (!field)
90 		return 0ULL;
91 
92 	tep_read_number_field(field, data, &val);
93 
94 	return val;
95 }
96 
97 unsigned long long read_size(struct tep_event *event, void *ptr, int size)
98 {
99 	return tep_read_number(event->tep, ptr, size);
100 }
101 
102 void event_format__fprintf(struct tep_event *event,
103 			   int cpu, void *data, int size, FILE *fp)
104 {
105 	struct tep_record record;
106 	struct trace_seq s;
107 
108 	memset(&record, 0, sizeof(record));
109 	record.cpu = cpu;
110 	record.size = size;
111 	record.data = data;
112 
113 	trace_seq_init(&s);
114 	tep_print_event(event->tep, &s, &record, "%s", TEP_PRINT_INFO);
115 	trace_seq_do_fprintf(&s, fp);
116 	trace_seq_destroy(&s);
117 }
118 
119 void event_format__print(struct tep_event *event,
120 			 int cpu, void *data, int size)
121 {
122 	return event_format__fprintf(event, cpu, data, size, stdout);
123 }
124 
125 void parse_ftrace_printk(struct tep_handle *pevent,
126 			 char *file, unsigned int size __maybe_unused)
127 {
128 	unsigned long long addr;
129 	char *printk;
130 	char *line;
131 	char *next = NULL;
132 	char *addr_str;
133 	char *fmt = NULL;
134 
135 	line = strtok_r(file, "\n", &next);
136 	while (line) {
137 		addr_str = strtok_r(line, ":", &fmt);
138 		if (!addr_str) {
139 			pr_warning("printk format with empty entry");
140 			break;
141 		}
142 		addr = strtoull(addr_str, NULL, 16);
143 		/* fmt still has a space, skip it */
144 		printk = strdup(fmt+1);
145 		line = strtok_r(NULL, "\n", &next);
146 		tep_register_print_string(pevent, printk, addr);
147 		free(printk);
148 	}
149 }
150 
151 void parse_saved_cmdline(struct tep_handle *pevent,
152 			 char *file, unsigned int size __maybe_unused)
153 {
154 	char comm[17]; /* Max comm length in the kernel is 16. */
155 	char *line;
156 	char *next = NULL;
157 	int pid;
158 
159 	line = strtok_r(file, "\n", &next);
160 	while (line) {
161 		if (sscanf(line, "%d %16s", &pid, comm) == 2)
162 			tep_register_comm(pevent, comm, pid);
163 		line = strtok_r(NULL, "\n", &next);
164 	}
165 }
166 
167 int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
168 {
169 	return tep_parse_event(pevent, buf, size, "ftrace");
170 }
171 
172 int parse_event_file(struct tep_handle *pevent,
173 		     char *buf, unsigned long size, char *sys)
174 {
175 	return tep_parse_event(pevent, buf, size, sys);
176 }
177 
178 struct flag {
179 	const char *name;
180 	unsigned long long value;
181 };
182 
183 static const struct flag flags[] = {
184 	{ "HI_SOFTIRQ", 0 },
185 	{ "TIMER_SOFTIRQ", 1 },
186 	{ "NET_TX_SOFTIRQ", 2 },
187 	{ "NET_RX_SOFTIRQ", 3 },
188 	{ "BLOCK_SOFTIRQ", 4 },
189 	{ "IRQ_POLL_SOFTIRQ", 5 },
190 	{ "TASKLET_SOFTIRQ", 6 },
191 	{ "SCHED_SOFTIRQ", 7 },
192 	{ "HRTIMER_SOFTIRQ", 8 },
193 	{ "RCU_SOFTIRQ", 9 },
194 
195 	{ "HRTIMER_NORESTART", 0 },
196 	{ "HRTIMER_RESTART", 1 },
197 };
198 
199 unsigned long long eval_flag(const char *flag)
200 {
201 	int i;
202 
203 	/*
204 	 * Some flags in the format files do not get converted.
205 	 * If the flag is not numeric, see if it is something that
206 	 * we already know about.
207 	 */
208 	if (isdigit(flag[0]))
209 		return strtoull(flag, NULL, 0);
210 
211 	for (i = 0; i < (int)(ARRAY_SIZE(flags)); i++)
212 		if (strcmp(flags[i].name, flag) == 0)
213 			return flags[i].value;
214 
215 	return 0;
216 }
217