1 #ifndef _LINUX_TIME64_H 2 #define _LINUX_TIME64_H 3 4 #include <uapi/linux/time.h> 5 #include <linux/math64.h> 6 7 typedef __s64 time64_t; 8 9 /* 10 * This wants to go into uapi/linux/time.h once we agreed about the 11 * userspace interfaces. 12 */ 13 #if __BITS_PER_LONG == 64 14 # define timespec64 timespec 15 #else 16 struct timespec64 { 17 time64_t tv_sec; /* seconds */ 18 long tv_nsec; /* nanoseconds */ 19 }; 20 #endif 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 #if __BITS_PER_LONG == 64 37 38 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 39 { 40 return ts64; 41 } 42 43 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 44 { 45 return ts; 46 } 47 48 # define timespec64_equal timespec_equal 49 # define timespec64_compare timespec_compare 50 # define set_normalized_timespec64 set_normalized_timespec 51 # define timespec64_add_safe timespec_add_safe 52 # define timespec64_add timespec_add 53 # define timespec64_sub timespec_sub 54 # define timespec64_valid timespec_valid 55 # define timespec64_valid_strict timespec_valid_strict 56 # define timespec64_to_ns timespec_to_ns 57 # define ns_to_timespec64 ns_to_timespec 58 # define timespec64_add_ns timespec_add_ns 59 60 #else 61 62 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 63 { 64 struct timespec ret; 65 66 ret.tv_sec = (time_t)ts64.tv_sec; 67 ret.tv_nsec = ts64.tv_nsec; 68 return ret; 69 } 70 71 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 72 { 73 struct timespec64 ret; 74 75 ret.tv_sec = ts.tv_sec; 76 ret.tv_nsec = ts.tv_nsec; 77 return ret; 78 } 79 80 static inline int timespec64_equal(const struct timespec64 *a, 81 const struct timespec64 *b) 82 { 83 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 84 } 85 86 /* 87 * lhs < rhs: return <0 88 * lhs == rhs: return 0 89 * lhs > rhs: return >0 90 */ 91 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 92 { 93 if (lhs->tv_sec < rhs->tv_sec) 94 return -1; 95 if (lhs->tv_sec > rhs->tv_sec) 96 return 1; 97 return lhs->tv_nsec - rhs->tv_nsec; 98 } 99 100 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 101 102 /* 103 * timespec64_add_safe assumes both values are positive and checks for 104 * overflow. It will return TIME_T_MAX if the returned value would be 105 * smaller then either of the arguments. 106 */ 107 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 108 const struct timespec64 rhs); 109 110 111 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 112 struct timespec64 rhs) 113 { 114 struct timespec64 ts_delta; 115 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 116 lhs.tv_nsec + rhs.tv_nsec); 117 return ts_delta; 118 } 119 120 /* 121 * sub = lhs - rhs, in normalized form 122 */ 123 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 124 struct timespec64 rhs) 125 { 126 struct timespec64 ts_delta; 127 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 128 lhs.tv_nsec - rhs.tv_nsec); 129 return ts_delta; 130 } 131 132 /* 133 * Returns true if the timespec64 is norm, false if denorm: 134 */ 135 static inline bool timespec64_valid(const struct timespec64 *ts) 136 { 137 /* Dates before 1970 are bogus */ 138 if (ts->tv_sec < 0) 139 return false; 140 /* Can't have more nanoseconds then a second */ 141 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 142 return false; 143 return true; 144 } 145 146 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 147 { 148 if (!timespec64_valid(ts)) 149 return false; 150 /* Disallow values that could overflow ktime_t */ 151 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 152 return false; 153 return true; 154 } 155 156 /** 157 * timespec64_to_ns - Convert timespec64 to nanoseconds 158 * @ts: pointer to the timespec64 variable to be converted 159 * 160 * Returns the scalar nanosecond representation of the timespec64 161 * parameter. 162 */ 163 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 164 { 165 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 166 } 167 168 /** 169 * ns_to_timespec64 - Convert nanoseconds to timespec64 170 * @nsec: the nanoseconds value to be converted 171 * 172 * Returns the timespec64 representation of the nsec parameter. 173 */ 174 extern struct timespec64 ns_to_timespec64(const s64 nsec); 175 176 /** 177 * timespec64_add_ns - Adds nanoseconds to a timespec64 178 * @a: pointer to timespec64 to be incremented 179 * @ns: unsigned nanoseconds value to be added 180 * 181 * This must always be inlined because its used from the x86-64 vdso, 182 * which cannot call other kernel functions. 183 */ 184 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 185 { 186 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 187 a->tv_nsec = ns; 188 } 189 190 #endif 191 192 #endif /* _LINUX_TIME64_H */ 193