1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TIME64_H 3 #define _LINUX_TIME64_H 4 5 #include <linux/math64.h> 6 7 typedef __s64 time64_t; 8 typedef __u64 timeu64_t; 9 10 #include <uapi/linux/time.h> 11 12 struct timespec64 { 13 time64_t tv_sec; /* seconds */ 14 long tv_nsec; /* nanoseconds */ 15 }; 16 17 struct itimerspec64 { 18 struct timespec64 it_interval; 19 struct timespec64 it_value; 20 }; 21 22 /* Parameters used to convert the timespec values: */ 23 #define MSEC_PER_SEC 1000L 24 #define USEC_PER_MSEC 1000L 25 #define NSEC_PER_USEC 1000L 26 #define NSEC_PER_MSEC 1000000L 27 #define USEC_PER_SEC 1000000L 28 #define NSEC_PER_SEC 1000000000L 29 #define FSEC_PER_SEC 1000000000000000LL 30 31 /* Located here for timespec[64]_valid_strict */ 32 #define TIME64_MAX ((s64)~((u64)1 << 63)) 33 #define KTIME_MAX ((s64)~((u64)1 << 63)) 34 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 35 36 static inline int timespec64_equal(const struct timespec64 *a, 37 const struct timespec64 *b) 38 { 39 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 40 } 41 42 /* 43 * lhs < rhs: return <0 44 * lhs == rhs: return 0 45 * lhs > rhs: return >0 46 */ 47 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 48 { 49 if (lhs->tv_sec < rhs->tv_sec) 50 return -1; 51 if (lhs->tv_sec > rhs->tv_sec) 52 return 1; 53 return lhs->tv_nsec - rhs->tv_nsec; 54 } 55 56 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 57 58 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 59 struct timespec64 rhs) 60 { 61 struct timespec64 ts_delta; 62 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 63 lhs.tv_nsec + rhs.tv_nsec); 64 return ts_delta; 65 } 66 67 /* 68 * sub = lhs - rhs, in normalized form 69 */ 70 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 71 struct timespec64 rhs) 72 { 73 struct timespec64 ts_delta; 74 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 75 lhs.tv_nsec - rhs.tv_nsec); 76 return ts_delta; 77 } 78 79 /* 80 * Returns true if the timespec64 is norm, false if denorm: 81 */ 82 static inline bool timespec64_valid(const struct timespec64 *ts) 83 { 84 /* Dates before 1970 are bogus */ 85 if (ts->tv_sec < 0) 86 return false; 87 /* Can't have more nanoseconds then a second */ 88 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 89 return false; 90 return true; 91 } 92 93 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 94 { 95 if (!timespec64_valid(ts)) 96 return false; 97 /* Disallow values that could overflow ktime_t */ 98 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 99 return false; 100 return true; 101 } 102 103 /** 104 * timespec64_to_ns - Convert timespec64 to nanoseconds 105 * @ts: pointer to the timespec64 variable to be converted 106 * 107 * Returns the scalar nanosecond representation of the timespec64 108 * parameter. 109 */ 110 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 111 { 112 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 113 } 114 115 /** 116 * ns_to_timespec64 - Convert nanoseconds to timespec64 117 * @nsec: the nanoseconds value to be converted 118 * 119 * Returns the timespec64 representation of the nsec parameter. 120 */ 121 extern struct timespec64 ns_to_timespec64(const s64 nsec); 122 123 /** 124 * timespec64_add_ns - Adds nanoseconds to a timespec64 125 * @a: pointer to timespec64 to be incremented 126 * @ns: unsigned nanoseconds value to be added 127 * 128 * This must always be inlined because its used from the x86-64 vdso, 129 * which cannot call other kernel functions. 130 */ 131 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 132 { 133 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 134 a->tv_nsec = ns; 135 } 136 137 /* 138 * timespec64_add_safe assumes both values are positive and checks for 139 * overflow. It will return TIME64_MAX in case of overflow. 140 */ 141 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 142 const struct timespec64 rhs); 143 144 #endif /* _LINUX_TIME64_H */ 145