summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/trace-event-parse.c
blob: f0332bd3a501ea4e3881178d62246a576b6ef875 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "debug.h"
#include "trace-event.h"

#include <linux/ctype.h>
#include <linux/kernel.h>
#include <traceevent/event-parse.h>

static int get_common_field(struct scripting_context *context,
			    int *offset, int *size, const char *type)
{
	struct tep_handle *pevent = context->pevent;
	struct tep_event *event;
	struct tep_format_field *field;

	if (!*size) {

		event = tep_get_first_event(pevent);
		if (!event)
			return 0;

		field = tep_find_common_field(event, type);
		if (!field)
			return 0;
		*offset = field->offset;
		*size = field->size;
	}

	return tep_read_number(pevent, context->event_data + *offset, *size);
}

int common_lock_depth(struct scripting_context *context)
{
	static int offset;
	static int size;
	int ret;

	ret = get_common_field(context, &size, &offset,
			       "common_lock_depth");
	if (ret < 0)
		return -1;

	return ret;
}

int common_flags(struct scripting_context *context)
{
	static int offset;
	static int size;
	int ret;

	ret = get_common_field(context, &size, &offset,
			       "common_flags");
	if (ret < 0)
		return -1;

	return ret;
}

int common_pc(struct scripting_context *context)
{
	static int offset;
	static int size;
	int ret;

	ret = get_common_field(context, &size, &offset,
			       "common_preempt_count");
	if (ret < 0)
		return -1;

	return ret;
}

unsigned long long
raw_field_value(struct tep_event *event, const char *name, void *data)
{
	struct tep_format_field *field;
	unsigned long long val;

	field = tep_find_any_field(event, name);
	if (!field)
		return 0ULL;

	tep_read_number_field(field, data, &val);

	return val;
}

unsigned long long read_size(struct tep_event *event, void *ptr, int size)
{
	return tep_read_number(event->tep, ptr, size);
}

void event_format__fprintf(struct tep_event *event,
			   int cpu, void *data, int size, FILE *fp)
{
	struct tep_record record;
	struct trace_seq s;

	memset(&record, 0, sizeof(record));
	record.cpu = cpu;
	record.size = size;
	record.data = data;

	trace_seq_init(&s);
	tep_print_event(event->tep, &s, &record, "%s", TEP_PRINT_INFO);
	trace_seq_do_fprintf(&s, fp);
	trace_seq_destroy(&s);
}

void event_format__print(struct tep_event *event,
			 int cpu, void *data, int size)
{
	return event_format__fprintf(event, cpu, data, size, stdout);
}

/*
 * prev_state is of size long, which is 32 bits on 32 bit architectures.
 * As it needs to have the same bits for both 32 bit and 64 bit architectures
 * we can just assume that the flags we care about will all be within
 * the 32 bits.
 */
#define MAX_STATE_BITS 32

static const char *convert_sym(struct tep_print_flag_sym *sym)
{
	static char save_states[MAX_STATE_BITS + 1];

	memset(save_states, 0, sizeof(save_states));

	/* This is the flags for the prev_state_field, now make them into a string */
	for (; sym; sym = sym->next) {
		long bitmask = strtoul(sym->value, NULL, 0);
		int i;

		for (i = 0; !(bitmask & 1); i++)
			bitmask >>= 1;

		if (i >= MAX_STATE_BITS)
			continue;

		save_states[i] = sym->str[0];
	}

	return save_states;
}

static struct tep_print_arg_field *
find_arg_field(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
{
	struct tep_print_arg_field *field;

	if (!arg)
		return NULL;

	if (arg->type == TEP_PRINT_FIELD)
		return &arg->field;

	if (arg->type == TEP_PRINT_OP) {
		field = find_arg_field(prev_state_field, arg->op.left);
		if (field && field->field == prev_state_field)
			return field;
		field = find_arg_field(prev_state_field, arg->op.right);
		if (field && field->field == prev_state_field)
			return field;
	}
	return NULL;
}

static struct tep_print_flag_sym *
test_flags(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
{
	struct tep_print_arg_field *field;

	field = find_arg_field(prev_state_field, arg->flags.field);
	if (!field)
		return NULL;

	return arg->flags.flags;
}

static struct tep_print_flag_sym *
search_op(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
{
	struct tep_print_flag_sym *sym = NULL;

	if (!arg)
		return NULL;

	if (arg->type == TEP_PRINT_OP) {
		sym = search_op(prev_state_field, arg->op.left);
		if (sym)
			return sym;

		sym = search_op(prev_state_field, arg->op.right);
		if (sym)
			return sym;
	} else if (arg->type == TEP_PRINT_FLAGS) {
		sym = test_flags(prev_state_field, arg);
	}

	return sym;
}

const char *parse_task_states(struct tep_format_field *state_field)
{
	struct tep_print_flag_sym *sym;
	struct tep_print_arg *arg;
	struct tep_event *event;

	event = state_field->event;

	/*
	 * Look at the event format fields, and search for where
	 * the prev_state is parsed via the format flags.
	 */
	for (arg = event->print_fmt.args; arg; arg = arg->next) {
		/*
		 * Currently, the __print_flags() for the prev_state
		 * is embedded in operations, so they too must be
		 * searched.
		 */
		sym = search_op(state_field, arg);
		if (sym)
			return convert_sym(sym);
	}
	return NULL;
}

void parse_ftrace_printk(struct tep_handle *pevent,
			 char *file, unsigned int size __maybe_unused)
{
	unsigned long long addr;
	char *printk;
	char *line;
	char *next = NULL;
	char *addr_str;
	char *fmt = NULL;

	line = strtok_r(file, "\n", &next);
	while (line) {
		addr_str = strtok_r(line, ":", &fmt);
		if (!addr_str) {
			pr_warning("printk format with empty entry");
			break;
		}
		addr = strtoull(addr_str, NULL, 16);
		/* fmt still has a space, skip it */
		printk = strdup(fmt+1);
		line = strtok_r(NULL, "\n", &next);
		tep_register_print_string(pevent, printk, addr);
		free(printk);
	}
}

void parse_saved_cmdline(struct tep_handle *pevent,
			 char *file, unsigned int size __maybe_unused)
{
	char comm[17]; /* Max comm length in the kernel is 16. */
	char *line;
	char *next = NULL;
	int pid;

	line = strtok_r(file, "\n", &next);
	while (line) {
		if (sscanf(line, "%d %16s", &pid, comm) == 2)
			tep_register_comm(pevent, comm, pid);
		line = strtok_r(NULL, "\n", &next);
	}
}

int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
{
	return tep_parse_event(pevent, buf, size, "ftrace");
}

int parse_event_file(struct tep_handle *pevent,
		     char *buf, unsigned long size, char *sys)
{
	return tep_parse_event(pevent, buf, size, sys);
}

struct flag {
	const char *name;
	unsigned long long value;
};

static const struct flag flags[] = {
	{ "HI_SOFTIRQ", 0 },
	{ "TIMER_SOFTIRQ", 1 },
	{ "NET_TX_SOFTIRQ", 2 },
	{ "NET_RX_SOFTIRQ", 3 },
	{ "BLOCK_SOFTIRQ", 4 },
	{ "IRQ_POLL_SOFTIRQ", 5 },
	{ "TASKLET_SOFTIRQ", 6 },
	{ "SCHED_SOFTIRQ", 7 },
	{ "HRTIMER_SOFTIRQ", 8 },
	{ "RCU_SOFTIRQ", 9 },

	{ "HRTIMER_NORESTART", 0 },
	{ "HRTIMER_RESTART", 1 },
};

unsigned long long eval_flag(const char *flag)
{
	int i;

	/*
	 * Some flags in the format files do not get converted.
	 * If the flag is not numeric, see if it is something that
	 * we already know about.
	 */
	if (isdigit(flag[0]))
		return strtoull(flag, NULL, 0);

	for (i = 0; i < (int)(ARRAY_SIZE(flags)); i++)
		if (strcmp(flags[i].name, flag) == 0)
			return flags[i].value;

	return 0;
}