1// SPDX-License-Identifier: GPL-2.0
  2
  3#include <subcmd/parse-options.h>
  4#include <stdio.h>
  5#include <time.h>
  6#include <strings.h>
  7#include <linux/time64.h>
  8#include "debug.h"
  9#include "clockid.h"
 10#include "record.h"
 11
 12struct clockid_map {
 13	const char *name;
 14	int clockid;
 15};
 16
 17#define CLOCKID_MAP(n, c)	\
 18	{ .name = n, .clockid = (c), }
 19
 20#define CLOCKID_END	{ .name = NULL, }
 21
 22
 23/*
 24 * Add the missing ones, we need to build on many distros...
 25 */
 26#ifndef CLOCK_MONOTONIC_RAW
 27#define CLOCK_MONOTONIC_RAW 4
 28#endif
 29#ifndef CLOCK_BOOTTIME
 30#define CLOCK_BOOTTIME 7
 31#endif
 32#ifndef CLOCK_TAI
 33#define CLOCK_TAI 11
 34#endif
 35
 36static const struct clockid_map clockids[] = {
 37	/* available for all events, NMI safe */
 38	CLOCKID_MAP("monotonic", CLOCK_MONOTONIC),
 39	CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW),
 40
 41	/* available for some events */
 42	CLOCKID_MAP("realtime", CLOCK_REALTIME),
 43	CLOCKID_MAP("boottime", CLOCK_BOOTTIME),
 44	CLOCKID_MAP("tai", CLOCK_TAI),
 45
 46	/* available for the lazy */
 47	CLOCKID_MAP("mono", CLOCK_MONOTONIC),
 48	CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW),
 49	CLOCKID_MAP("real", CLOCK_REALTIME),
 50	CLOCKID_MAP("boot", CLOCK_BOOTTIME),
 51
 52	CLOCKID_END,
 53};
 54
 55static int get_clockid_res(clockid_t clk_id, u64 *res_ns)
 56{
 57	struct timespec res;
 58
 59	*res_ns = 0;
 60	if (!clock_getres(clk_id, &res))
 61		*res_ns = res.tv_nsec + res.tv_sec * NSEC_PER_SEC;
 62	else
 63		pr_warning("WARNING: Failed to determine specified clock resolution.\n");
 64
 65	return 0;
 66}
 67
 68int parse_clockid(const struct option *opt, const char *str, int unset)
 69{
 70	struct record_opts *opts = (struct record_opts *)opt->value;
 71	const struct clockid_map *cm;
 72	const char *ostr = str;
 73
 74	if (unset) {
 75		opts->use_clockid = 0;
 76		return 0;
 77	}
 78
 79	/* no arg passed */
 80	if (!str)
 81		return 0;
 82
 83	/* no setting it twice */
 84	if (opts->use_clockid)
 85		return -1;
 86
 87	opts->use_clockid = true;
 88
 89	/* if its a number, we're done */
 90	if (sscanf(str, "%d", &opts->clockid) == 1)
 91		return get_clockid_res(opts->clockid, &opts->clockid_res_ns);
 92
 93	/* allow a "CLOCK_" prefix to the name */
 94	if (!strncasecmp(str, "CLOCK_", 6))
 95		str += 6;
 96
 97	for (cm = clockids; cm->name; cm++) {
 98		if (!strcasecmp(str, cm->name)) {
 99			opts->clockid = cm->clockid;
100			return get_clockid_res(opts->clockid,
101					       &opts->clockid_res_ns);
102		}
103	}
104
105	opts->use_clockid = false;
106	ui__warning("unknown clockid %s, check man page\n", ostr);
107	return -1;
108}
109
110const char *clockid_name(clockid_t clk_id)
111{
112	const struct clockid_map *cm;
113
114	for (cm = clockids; cm->name; cm++) {
115		if (cm->clockid == clk_id)
116			return cm->name;
117	}
118	return "(not found)";
119}