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323 lines · 6.9 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2009, Steven Rostedt <[email protected]>
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 <event-parse.h>
16
17static 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
40int 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
54int 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
68int 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
82unsigned long long
83raw_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
97unsigned long long read_size(struct tep_event *event, void *ptr, int size)
98{
99 return tep_read_number(event->tep, ptr, size);
100}
101
102void event_format__fprintf(const 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/*
120 * prev_state is of size long, which is 32 bits on 32 bit architectures.
121 * As it needs to have the same bits for both 32 bit and 64 bit architectures
122 * we can just assume that the flags we care about will all be within
123 * the 32 bits.
124 */
125#define MAX_STATE_BITS 32
126
127static const char *convert_sym(struct tep_print_flag_sym *sym)
128{
129 static char save_states[MAX_STATE_BITS + 1];
130
131 memset(save_states, 0, sizeof(save_states));
132
133 /* This is the flags for the prev_state_field, now make them into a string */
134 for (; sym; sym = sym->next) {
135 long bitmask = strtoul(sym->value, NULL, 0);
136 int i;
137
138 for (i = 0; !(bitmask & 1); i++)
139 bitmask >>= 1;
140
141 if (i >= MAX_STATE_BITS)
142 continue;
143
144 save_states[i] = sym->str[0];
145 }
146
147 return save_states;
148}
149
150static struct tep_print_arg_field *
151find_arg_field(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
152{
153 struct tep_print_arg_field *field;
154
155 if (!arg)
156 return NULL;
157
158 if (arg->type == TEP_PRINT_FIELD)
159 return &arg->field;
160
161 if (arg->type == TEP_PRINT_OP) {
162 field = find_arg_field(prev_state_field, arg->op.left);
163 if (field && field->field == prev_state_field)
164 return field;
165 field = find_arg_field(prev_state_field, arg->op.right);
166 if (field && field->field == prev_state_field)
167 return field;
168 }
169 return NULL;
170}
171
172static struct tep_print_flag_sym *
173test_flags(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
174{
175 struct tep_print_arg_field *field;
176
177 field = find_arg_field(prev_state_field, arg->flags.field);
178 if (!field)
179 return NULL;
180
181 return arg->flags.flags;
182}
183
184static struct tep_print_flag_sym *
185search_op(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
186{
187 struct tep_print_flag_sym *sym = NULL;
188
189 if (!arg)
190 return NULL;
191
192 if (arg->type == TEP_PRINT_OP) {
193 sym = search_op(prev_state_field, arg->op.left);
194 if (sym)
195 return sym;
196
197 sym = search_op(prev_state_field, arg->op.right);
198 if (sym)
199 return sym;
200 } else if (arg->type == TEP_PRINT_FLAGS) {
201 sym = test_flags(prev_state_field, arg);
202 }
203
204 return sym;
205}
206
207const char *parse_task_states(struct tep_format_field *state_field)
208{
209 struct tep_print_flag_sym *sym;
210 struct tep_print_arg *arg;
211 struct tep_event *event;
212
213 event = state_field->event;
214
215 /*
216 * Look at the event format fields, and search for where
217 * the prev_state is parsed via the format flags.
218 */
219 for (arg = event->print_fmt.args; arg; arg = arg->next) {
220 /*
221 * Currently, the __print_flags() for the prev_state
222 * is embedded in operations, so they too must be
223 * searched.
224 */
225 sym = search_op(state_field, arg);
226 if (sym)
227 return convert_sym(sym);
228 }
229 return NULL;
230}
231
232void parse_ftrace_printk(struct tep_handle *pevent,
233 char *file, unsigned int size __maybe_unused)
234{
235 unsigned long long addr;
236 char *printk;
237 char *line;
238 char *next = NULL;
239 char *addr_str;
240 char *fmt = NULL;
241
242 line = strtok_r(file, "\n", &next);
243 while (line) {
244 addr_str = strtok_r(line, ":", &fmt);
245 if (!addr_str) {
246 pr_warning("printk format with empty entry");
247 break;
248 }
249 addr = strtoull(addr_str, NULL, 16);
250 /* fmt still has a space, skip it */
251 printk = strdup(fmt+1);
252 line = strtok_r(NULL, "\n", &next);
253 tep_register_print_string(pevent, printk, addr);
254 free(printk);
255 }
256}
257
258void parse_saved_cmdline(struct tep_handle *pevent,
259 char *file, unsigned int size __maybe_unused)
260{
261 char comm[17]; /* Max comm length in the kernel is 16. */
262 char *line;
263 char *next = NULL;
264 int pid;
265
266 line = strtok_r(file, "\n", &next);
267 while (line) {
268 if (sscanf(line, "%d %16s", &pid, comm) == 2)
269 tep_register_comm(pevent, comm, pid);
270 line = strtok_r(NULL, "\n", &next);
271 }
272}
273
274int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
275{
276 return tep_parse_event(pevent, buf, size, "ftrace");
277}
278
279int parse_event_file(struct tep_handle *pevent,
280 char *buf, unsigned long size, char *sys)
281{
282 return tep_parse_event(pevent, buf, size, sys);
283}
284
285struct flag {
286 const char *name;
287 unsigned long long value;
288};
289
290static const struct flag flags[] = {
291 { "HI_SOFTIRQ", 0 },
292 { "TIMER_SOFTIRQ", 1 },
293 { "NET_TX_SOFTIRQ", 2 },
294 { "NET_RX_SOFTIRQ", 3 },
295 { "BLOCK_SOFTIRQ", 4 },
296 { "IRQ_POLL_SOFTIRQ", 5 },
297 { "TASKLET_SOFTIRQ", 6 },
298 { "SCHED_SOFTIRQ", 7 },
299 { "HRTIMER_SOFTIRQ", 8 },
300 { "RCU_SOFTIRQ", 9 },
301
302 { "HRTIMER_NORESTART", 0 },
303 { "HRTIMER_RESTART", 1 },
304};
305
306unsigned long long eval_flag(const char *flag)
307{
308 int i;
309
310 /*
311 * Some flags in the format files do not get converted.
312 * If the flag is not numeric, see if it is something that
313 * we already know about.
314 */
315 if (isdigit(flag[0]))
316 return strtoull(flag, NULL, 0);
317
318 for (i = 0; i < (int)(ARRAY_SIZE(flags)); i++)
319 if (strcmp(flags[i].name, flag) == 0)
320 return flags[i].value;
321
322 return 0;
323}