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 | |
12 | struct 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 | |
36 | static 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 | |
55 | static 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 | |
68 | int 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(clk_id: opts->clockid, res_ns: &opts->clockid_res_ns); |
92 | |
93 | /* allow a "CLOCK_" prefix to the name */ |
94 | if (!strncasecmp(s1: str, s2: "CLOCK_" , n: 6)) |
95 | str += 6; |
96 | |
97 | for (cm = clockids; cm->name; cm++) { |
98 | if (!strcasecmp(s1: str, s2: cm->name)) { |
99 | opts->clockid = cm->clockid; |
100 | return get_clockid_res(clk_id: opts->clockid, |
101 | res_ns: &opts->clockid_res_ns); |
102 | } |
103 | } |
104 | |
105 | opts->use_clockid = false; |
106 | ui__warning(format: "unknown clockid %s, check man page\n" , ostr); |
107 | return -1; |
108 | } |
109 | |
110 | const 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 | } |
120 | |