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 /* 12 * This wants to go into uapi/linux/time.h once we agreed about the 13 * userspace interfaces. 14 */ 15 #if __BITS_PER_LONG == 64 16 # define timespec64 timespec 17 #define itimerspec64 itimerspec 18 #else 19 struct timespec64 { 20 time64_t tv_sec; /* seconds */ 21 long tv_nsec; /* nanoseconds */ 22 }; 23 24 struct itimerspec64 { 25 struct timespec64 it_interval; 26 struct timespec64 it_value; 27 }; 28 29 #endif 30 31 /* Parameters used to convert the timespec values: */ 32 #define MSEC_PER_SEC 1000L 33 #define USEC_PER_MSEC 1000L 34 #define NSEC_PER_USEC 1000L 35 #define NSEC_PER_MSEC 1000000L 36 #define USEC_PER_SEC 1000000L 37 #define NSEC_PER_SEC 1000000000L 38 #define FSEC_PER_SEC 1000000000000000LL 39 40 /* Located here for timespec[64]_valid_strict */ 41 #define TIME64_MAX ((s64)~((u64)1 << 63)) 42 #define KTIME_MAX ((s64)~((u64)1 << 63)) 43 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 44 45 #if __BITS_PER_LONG == 64 46 47 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 48 { 49 return ts64; 50 } 51 52 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 53 { 54 return ts; 55 } 56 57 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) 58 { 59 return *its64; 60 } 61 62 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) 63 { 64 return *its; 65 } 66 67 # define timespec64_equal timespec_equal 68 # define timespec64_compare timespec_compare 69 # define set_normalized_timespec64 set_normalized_timespec 70 # define timespec64_add timespec_add 71 # define timespec64_sub timespec_sub 72 # define timespec64_valid timespec_valid 73 # define timespec64_valid_strict timespec_valid_strict 74 # define timespec64_to_ns timespec_to_ns 75 # define ns_to_timespec64 ns_to_timespec 76 # define timespec64_add_ns timespec_add_ns 77 78 #else 79 80 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 81 { 82 struct timespec ret; 83 84 ret.tv_sec = (time_t)ts64.tv_sec; 85 ret.tv_nsec = ts64.tv_nsec; 86 return ret; 87 } 88 89 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 90 { 91 struct timespec64 ret; 92 93 ret.tv_sec = ts.tv_sec; 94 ret.tv_nsec = ts.tv_nsec; 95 return ret; 96 } 97 98 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) 99 { 100 struct itimerspec ret; 101 102 ret.it_interval = timespec64_to_timespec(its64->it_interval); 103 ret.it_value = timespec64_to_timespec(its64->it_value); 104 return ret; 105 } 106 107 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) 108 { 109 struct itimerspec64 ret; 110 111 ret.it_interval = timespec_to_timespec64(its->it_interval); 112 ret.it_value = timespec_to_timespec64(its->it_value); 113 return ret; 114 } 115 116 static inline int timespec64_equal(const struct timespec64 *a, 117 const struct timespec64 *b) 118 { 119 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 120 } 121 122 /* 123 * lhs < rhs: return <0 124 * lhs == rhs: return 0 125 * lhs > rhs: return >0 126 */ 127 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 128 { 129 if (lhs->tv_sec < rhs->tv_sec) 130 return -1; 131 if (lhs->tv_sec > rhs->tv_sec) 132 return 1; 133 return lhs->tv_nsec - rhs->tv_nsec; 134 } 135 136 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 137 138 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 139 struct timespec64 rhs) 140 { 141 struct timespec64 ts_delta; 142 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 143 lhs.tv_nsec + rhs.tv_nsec); 144 return ts_delta; 145 } 146 147 /* 148 * sub = lhs - rhs, in normalized form 149 */ 150 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 151 struct timespec64 rhs) 152 { 153 struct timespec64 ts_delta; 154 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 155 lhs.tv_nsec - rhs.tv_nsec); 156 return ts_delta; 157 } 158 159 /* 160 * Returns true if the timespec64 is norm, false if denorm: 161 */ 162 static inline bool timespec64_valid(const struct timespec64 *ts) 163 { 164 /* Dates before 1970 are bogus */ 165 if (ts->tv_sec < 0) 166 return false; 167 /* Can't have more nanoseconds then a second */ 168 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 169 return false; 170 return true; 171 } 172 173 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 174 { 175 if (!timespec64_valid(ts)) 176 return false; 177 /* Disallow values that could overflow ktime_t */ 178 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 179 return false; 180 return true; 181 } 182 183 /** 184 * timespec64_to_ns - Convert timespec64 to nanoseconds 185 * @ts: pointer to the timespec64 variable to be converted 186 * 187 * Returns the scalar nanosecond representation of the timespec64 188 * parameter. 189 */ 190 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 191 { 192 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 193 } 194 195 /** 196 * ns_to_timespec64 - Convert nanoseconds to timespec64 197 * @nsec: the nanoseconds value to be converted 198 * 199 * Returns the timespec64 representation of the nsec parameter. 200 */ 201 extern struct timespec64 ns_to_timespec64(const s64 nsec); 202 203 /** 204 * timespec64_add_ns - Adds nanoseconds to a timespec64 205 * @a: pointer to timespec64 to be incremented 206 * @ns: unsigned nanoseconds value to be added 207 * 208 * This must always be inlined because its used from the x86-64 vdso, 209 * which cannot call other kernel functions. 210 */ 211 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 212 { 213 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 214 a->tv_nsec = ns; 215 } 216 217 #endif 218 219 /* 220 * timespec64_add_safe assumes both values are positive and checks for 221 * overflow. It will return TIME64_MAX in case of overflow. 222 */ 223 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 224 const struct timespec64 rhs); 225 226 #endif /* _LINUX_TIME64_H */ 227