1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TIME64_H 3 #define _LINUX_TIME64_H 4 5 #include <uapi/linux/time.h> 6 #include <linux/math64.h> 7 8 typedef __s64 time64_t; 9 typedef __u64 timeu64_t; 10 11 #if __BITS_PER_LONG == 64 12 /* this trick allows us to optimize out timespec64_to_timespec */ 13 # define timespec64 timespec 14 #define itimerspec64 itimerspec 15 #else 16 struct timespec64 { 17 time64_t tv_sec; /* seconds */ 18 long tv_nsec; /* nanoseconds */ 19 }; 20 21 struct itimerspec64 { 22 struct timespec64 it_interval; 23 struct timespec64 it_value; 24 }; 25 26 #endif 27 28 /* Parameters used to convert the timespec values: */ 29 #define MSEC_PER_SEC 1000L 30 #define USEC_PER_MSEC 1000L 31 #define NSEC_PER_USEC 1000L 32 #define NSEC_PER_MSEC 1000000L 33 #define USEC_PER_SEC 1000000L 34 #define NSEC_PER_SEC 1000000000L 35 #define FSEC_PER_SEC 1000000000000000LL 36 37 /* Located here for timespec[64]_valid_strict */ 38 #define TIME64_MAX ((s64)~((u64)1 << 63)) 39 #define KTIME_MAX ((s64)~((u64)1 << 63)) 40 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 41 42 static inline int timespec64_equal(const struct timespec64 *a, 43 const struct timespec64 *b) 44 { 45 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 46 } 47 48 /* 49 * lhs < rhs: return <0 50 * lhs == rhs: return 0 51 * lhs > rhs: return >0 52 */ 53 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 54 { 55 if (lhs->tv_sec < rhs->tv_sec) 56 return -1; 57 if (lhs->tv_sec > rhs->tv_sec) 58 return 1; 59 return lhs->tv_nsec - rhs->tv_nsec; 60 } 61 62 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 63 64 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 65 struct timespec64 rhs) 66 { 67 struct timespec64 ts_delta; 68 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 69 lhs.tv_nsec + rhs.tv_nsec); 70 return ts_delta; 71 } 72 73 /* 74 * sub = lhs - rhs, in normalized form 75 */ 76 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 77 struct timespec64 rhs) 78 { 79 struct timespec64 ts_delta; 80 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 81 lhs.tv_nsec - rhs.tv_nsec); 82 return ts_delta; 83 } 84 85 /* 86 * Returns true if the timespec64 is norm, false if denorm: 87 */ 88 static inline bool timespec64_valid(const struct timespec64 *ts) 89 { 90 /* Dates before 1970 are bogus */ 91 if (ts->tv_sec < 0) 92 return false; 93 /* Can't have more nanoseconds then a second */ 94 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 95 return false; 96 return true; 97 } 98 99 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 100 { 101 if (!timespec64_valid(ts)) 102 return false; 103 /* Disallow values that could overflow ktime_t */ 104 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 105 return false; 106 return true; 107 } 108 109 /** 110 * timespec64_to_ns - Convert timespec64 to nanoseconds 111 * @ts: pointer to the timespec64 variable to be converted 112 * 113 * Returns the scalar nanosecond representation of the timespec64 114 * parameter. 115 */ 116 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 117 { 118 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 119 } 120 121 /** 122 * ns_to_timespec64 - Convert nanoseconds to timespec64 123 * @nsec: the nanoseconds value to be converted 124 * 125 * Returns the timespec64 representation of the nsec parameter. 126 */ 127 extern struct timespec64 ns_to_timespec64(const s64 nsec); 128 129 /** 130 * timespec64_add_ns - Adds nanoseconds to a timespec64 131 * @a: pointer to timespec64 to be incremented 132 * @ns: unsigned nanoseconds value to be added 133 * 134 * This must always be inlined because its used from the x86-64 vdso, 135 * which cannot call other kernel functions. 136 */ 137 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 138 { 139 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 140 a->tv_nsec = ns; 141 } 142 143 /* 144 * timespec64_add_safe assumes both values are positive and checks for 145 * overflow. It will return TIME64_MAX in case of overflow. 146 */ 147 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 148 const struct timespec64 rhs); 149 150 #endif /* _LINUX_TIME64_H */ 151