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 /*
126 * prev_state is of size long, which is 32 bits on 32 bit architectures.
127 * As it needs to have the same bits for both 32 bit and 64 bit architectures
128 * we can just assume that the flags we care about will all be within
129 * the 32 bits.
130 */
131 #define MAX_STATE_BITS 32
132
133 static const char *convert_sym(struct tep_print_flag_sym *sym)
134 {
135 static char save_states[MAX_STATE_BITS + 1];
136
137 memset(save_states, 0, sizeof(save_states));
138
139 /* This is the flags for the prev_state_field, now make them into a string */
140 for (; sym; sym = sym->next) {
141 long bitmask = strtoul(sym->value, NULL, 0);
142 int i;
143
144 for (i = 0; !(bitmask & 1); i++)
145 bitmask >>= 1;
146
147 if (i >= MAX_STATE_BITS)
148 continue;
149
150 save_states[i] = sym->str[0];
151 }
152
153 return save_states;
154 }
155
156 static struct tep_print_arg_field *
157 find_arg_field(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
158 {
159 struct tep_print_arg_field *field;
160
161 if (!arg)
162 return NULL;
163
164 if (arg->type == TEP_PRINT_FIELD)
165 return &arg->field;
166
167 if (arg->type == TEP_PRINT_OP) {
168 field = find_arg_field(prev_state_field, arg->op.left);
169 if (field && field->field == prev_state_field)
170 return field;
171 field = find_arg_field(prev_state_field, arg->op.right);
172 if (field && field->field == prev_state_field)
173 return field;
174 }
175 return NULL;
176 }
177
178 static struct tep_print_flag_sym *
179 test_flags(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
180 {
181 struct tep_print_arg_field *field;
182
183 field = find_arg_field(prev_state_field, arg->flags.field);
184 if (!field)
185 return NULL;
186
187 return arg->flags.flags;
188 }
189
190 static struct tep_print_flag_sym *
191 search_op(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
192 {
193 struct tep_print_flag_sym *sym = NULL;
194
195 if (!arg)
196 return NULL;
197
198 if (arg->type == TEP_PRINT_OP) {
199 sym = search_op(prev_state_field, arg->op.left);
200 if (sym)
201 return sym;
202
203 sym = search_op(prev_state_field, arg->op.right);
204 if (sym)
205 return sym;
206 } else if (arg->type == TEP_PRINT_FLAGS) {
207 sym = test_flags(prev_state_field, arg);
208 }
209
210 return sym;
211 }
212
213 const char *parse_task_states(struct tep_format_field *state_field)
214 {
215 struct tep_print_flag_sym *sym;
216 struct tep_print_arg *arg;
217 struct tep_event *event;
218
219 event = state_field->event;
220
221 /*
222 * Look at the event format fields, and search for where
223 * the prev_state is parsed via the format flags.
224 */
225 for (arg = event->print_fmt.args; arg; arg = arg->next) {
226 /*
227 * Currently, the __print_flags() for the prev_state
228 * is embedded in operations, so they too must be
229 * searched.
230 */
231 sym = search_op(state_field, arg);
232 if (sym)
233 return convert_sym(sym);
234 }
235 return NULL;
236 }
237
238 void parse_ftrace_printk(struct tep_handle *pevent,
239 char *file, unsigned int size __maybe_unused)
240 {
241 unsigned long long addr;
242 char *printk;
243 char *line;
244 char *next = NULL;
245 char *addr_str;
246 char *fmt = NULL;
247
248 line = strtok_r(file, "\n", &next);
249 while (line) {
250 addr_str = strtok_r(line, ":", &fmt);
251 if (!addr_str) {
252 pr_warning("printk format with empty entry");
253 break;
254 }
255 addr = strtoull(addr_str, NULL, 16);
256 /* fmt still has a space, skip it */
257 printk = strdup(fmt+1);
258 line = strtok_r(NULL, "\n", &next);
259 tep_register_print_string(pevent, printk, addr);
260 free(printk);
261 }
262 }
263
264 void parse_saved_cmdline(struct tep_handle *pevent,
265 char *file, unsigned int size __maybe_unused)
266 {
267 char comm[17]; /* Max comm length in the kernel is 16. */
268 char *line;
269 char *next = NULL;
270 int pid;
271
272 line = strtok_r(file, "\n", &next);
273 while (line) {
274 if (sscanf(line, "%d %16s", &pid, comm) == 2)
275 tep_register_comm(pevent, comm, pid);
276 line = strtok_r(NULL, "\n", &next);
277 }
278 }
279
280 int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
281 {
282 return tep_parse_event(pevent, buf, size, "ftrace");
283 }
284
285 int parse_event_file(struct tep_handle *pevent,
286 char *buf, unsigned long size, char *sys)
287 {
288 return tep_parse_event(pevent, buf, size, sys);
289 }
290
291 struct flag {
292 const char *name;
293 unsigned long long value;
294 };
295
296 static const struct flag flags[] = {
297 { "HI_SOFTIRQ", 0 },
298 { "TIMER_SOFTIRQ", 1 },
299 { "NET_TX_SOFTIRQ", 2 },
300 { "NET_RX_SOFTIRQ", 3 },
301 { "BLOCK_SOFTIRQ", 4 },
302 { "IRQ_POLL_SOFTIRQ", 5 },
303 { "TASKLET_SOFTIRQ", 6 },
304 { "SCHED_SOFTIRQ", 7 },
305 { "HRTIMER_SOFTIRQ", 8 },
306 { "RCU_SOFTIRQ", 9 },
307
308 { "HRTIMER_NORESTART", 0 },
309 { "HRTIMER_RESTART", 1 },
310 };
311
312 unsigned long long eval_flag(const char *flag)
313 {
314 int i;
315
316 /*
317 * Some flags in the format files do not get converted.
318 * If the flag is not numeric, see if it is something that
319 * we already know about.
320 */
321 if (isdigit(flag[0]))
322 return strtoull(flag, NULL, 0);
323
324 for (i = 0; i < (int)(ARRAY_SIZE(flags)); i++)
325 if (strcmp(flags[i].name, flag) == 0)
326 return flags[i].value;
327
328 return 0;
329 }
330
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.