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 
15 static int get_common_field(struct scripting_context *context,
16 			    int *offset, int *size, const char *type)
17 {
18 	struct tep_handle *pevent = context->pevent;
19 	struct tep_event *event;
20 	struct tep_format_field *field;
21 
22 	if (!*size) {
23 
24 		event = tep_get_first_event(pevent);
25 		if (!event)
26 			return 0;
27 
28 		field = tep_find_common_field(event, type);
29 		if (!field)
30 			return 0;
31 		*offset = field->offset;
32 		*size = field->size;
33 	}
34 
35 	return tep_read_number(pevent, context->event_data + *offset, *size);
36 }
37 
38 int common_lock_depth(struct scripting_context *context)
39 {
40 	static int offset;
41 	static int size;
42 	int ret;
43 
44 	ret = get_common_field(context, &size, &offset,
45 			       "common_lock_depth");
46 	if (ret < 0)
47 		return -1;
48 
49 	return ret;
50 }
51 
52 int common_flags(struct scripting_context *context)
53 {
54 	static int offset;
55 	static int size;
56 	int ret;
57 
58 	ret = get_common_field(context, &size, &offset,
59 			       "common_flags");
60 	if (ret < 0)
61 		return -1;
62 
63 	return ret;
64 }
65 
66 int common_pc(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_preempt_count");
74 	if (ret < 0)
75 		return -1;
76 
77 	return ret;
78 }
79 
80 unsigned long long
81 raw_field_value(struct tep_event *event, const char *name, void *data)
82 {
83 	struct tep_format_field *field;
84 	unsigned long long val;
85 
86 	field = tep_find_any_field(event, name);
87 	if (!field)
88 		return 0ULL;
89 
90 	tep_read_number_field(field, data, &val);
91 
92 	return val;
93 }
94 
95 unsigned long long read_size(struct tep_event *event, void *ptr, int size)
96 {
97 	return tep_read_number(event->tep, ptr, size);
98 }
99 
100 void event_format__fprintf(struct tep_event *event,
101 			   int cpu, void *data, int size, FILE *fp)
102 {
103 	struct tep_record record;
104 	struct trace_seq s;
105 
106 	memset(&record, 0, sizeof(record));
107 	record.cpu = cpu;
108 	record.size = size;
109 	record.data = data;
110 
111 	trace_seq_init(&s);
112 	tep_print_event(event->tep, &s, &record, "%s", TEP_PRINT_INFO);
113 	trace_seq_do_fprintf(&s, fp);
114 	trace_seq_destroy(&s);
115 }
116 
117 void event_format__print(struct tep_event *event,
118 			 int cpu, void *data, int size)
119 {
120 	return event_format__fprintf(event, cpu, data, size, stdout);
121 }
122 
123 void parse_ftrace_printk(struct tep_handle *pevent,
124 			 char *file, unsigned int size __maybe_unused)
125 {
126 	unsigned long long addr;
127 	char *printk;
128 	char *line;
129 	char *next = NULL;
130 	char *addr_str;
131 	char *fmt = NULL;
132 
133 	line = strtok_r(file, "\n", &next);
134 	while (line) {
135 		addr_str = strtok_r(line, ":", &fmt);
136 		if (!addr_str) {
137 			pr_warning("printk format with empty entry");
138 			break;
139 		}
140 		addr = strtoull(addr_str, NULL, 16);
141 		/* fmt still has a space, skip it */
142 		printk = strdup(fmt+1);
143 		line = strtok_r(NULL, "\n", &next);
144 		tep_register_print_string(pevent, printk, addr);
145 		free(printk);
146 	}
147 }
148 
149 void parse_saved_cmdline(struct tep_handle *pevent,
150 			 char *file, unsigned int size __maybe_unused)
151 {
152 	char comm[17]; /* Max comm length in the kernel is 16. */
153 	char *line;
154 	char *next = NULL;
155 	int pid;
156 
157 	line = strtok_r(file, "\n", &next);
158 	while (line) {
159 		if (sscanf(line, "%d %16s", &pid, comm) == 2)
160 			tep_register_comm(pevent, comm, pid);
161 		line = strtok_r(NULL, "\n", &next);
162 	}
163 }
164 
165 int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
166 {
167 	return tep_parse_event(pevent, buf, size, "ftrace");
168 }
169 
170 int parse_event_file(struct tep_handle *pevent,
171 		     char *buf, unsigned long size, char *sys)
172 {
173 	return tep_parse_event(pevent, buf, size, sys);
174 }
175 
176 struct tep_event *trace_find_next_event(struct tep_handle *pevent,
177 					struct tep_event *event)
178 {
179 	static int idx;
180 	int events_count;
181 	struct tep_event *all_events;
182 
183 	all_events = tep_get_first_event(pevent);
184 	events_count = tep_get_events_count(pevent);
185 	if (!pevent || !all_events || events_count < 1)
186 		return NULL;
187 
188 	if (!event) {
189 		idx = 0;
190 		return all_events;
191 	}
192 
193 	if (idx < events_count && event == (all_events + idx)) {
194 		idx++;
195 		if (idx == events_count)
196 			return NULL;
197 		return (all_events + idx);
198 	}
199 
200 	for (idx = 1; idx < events_count; idx++) {
201 		if (event == (all_events + (idx - 1)))
202 			return (all_events + idx);
203 	}
204 	return NULL;
205 }
206 
207 struct flag {
208 	const char *name;
209 	unsigned long long value;
210 };
211 
212 static const struct flag flags[] = {
213 	{ "HI_SOFTIRQ", 0 },
214 	{ "TIMER_SOFTIRQ", 1 },
215 	{ "NET_TX_SOFTIRQ", 2 },
216 	{ "NET_RX_SOFTIRQ", 3 },
217 	{ "BLOCK_SOFTIRQ", 4 },
218 	{ "IRQ_POLL_SOFTIRQ", 5 },
219 	{ "TASKLET_SOFTIRQ", 6 },
220 	{ "SCHED_SOFTIRQ", 7 },
221 	{ "HRTIMER_SOFTIRQ", 8 },
222 	{ "RCU_SOFTIRQ", 9 },
223 
224 	{ "HRTIMER_NORESTART", 0 },
225 	{ "HRTIMER_RESTART", 1 },
226 };
227 
228 unsigned long long eval_flag(const char *flag)
229 {
230 	int i;
231 
232 	/*
233 	 * Some flags in the format files do not get converted.
234 	 * If the flag is not numeric, see if it is something that
235 	 * we already know about.
236 	 */
237 	if (isdigit(flag[0]))
238 		return strtoull(flag, NULL, 0);
239 
240 	for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
241 		if (strcmp(flags[i].name, flag) == 0)
242 			return flags[i].value;
243 
244 	return 0;
245 }
246