tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
fork
Configure Feed
Select the types of activity you want to include in your feed.
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
15static 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
38int 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
52int 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
66int 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
80unsigned long long
81raw_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
95unsigned long long read_size(struct tep_event *event, void *ptr, int size)
96{
97 return tep_read_number(event->tep, ptr, size);
98}
99
100void 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
117void 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
123void 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
149void 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
165int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
166{
167 return tep_parse_event(pevent, buf, size, "ftrace");
168}
169
170int 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
176struct 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
207struct flag {
208 const char *name;
209 unsigned long long value;
210};
211
212static 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
228unsigned 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}