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(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 } 109 110 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