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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238/* * include/linux/ktime.h * * ktime_t - nanosecond-resolution time format. * * Copyright(C) 2005, Linutronix GmbH, Thomas Gleixner <tglx@kernel.org> * Copyright(C) 2005, Red Hat, Inc., Ingo Molnar * * data type definitions, declarations, prototypes and macros. * * Started by: Thomas Gleixner and Ingo Molnar * * Credits: * * Roman Zippel provided the ideas and primary code snippets of * the ktime_t union and further simplifications of the original * code. * * For licencing details see kernel-base/COPYING */#ifndef _LINUX_KTIME_H#define _LINUX_KTIME_H
#include <asm/bug.h>#include <linux/jiffies.h>#include <linux/time.h>#include <linux/types.h>
/** * ktime_set - Set a ktime_t variable from a seconds/nanoseconds value * @secs: seconds to set * @nsecs: nanoseconds to set * * Return: The ktime_t representation of the value. */static inline ktime_t ktime_set(const s64 secs, const unsigned long nsecs){ if (unlikely(secs >= KTIME_SEC_MAX)) return KTIME_MAX;
return secs * NSEC_PER_SEC + (s64)nsecs;}
/* Subtract two ktime_t variables. rem = lhs -rhs: */#define ktime_sub(lhs, rhs) ((lhs) - (rhs))
/* Add two ktime_t variables. res = lhs + rhs: */#define ktime_add(lhs, rhs) ((lhs) + (rhs))
/* * Same as ktime_add(), but avoids undefined behaviour on overflow; however, * this means that you must check the result for overflow yourself. */#define ktime_add_unsafe(lhs, rhs) ((u64) (lhs) + (rhs))
/* * Add a ktime_t variable and a scalar nanosecond value. * res = kt + nsval: */#define ktime_add_ns(kt, nsval) ((kt) + (nsval))
/* * Subtract a scalar nanosecod from a ktime_t variable * res = kt - nsval: */#define ktime_sub_ns(kt, nsval) ((kt) - (nsval))
/* convert a timespec64 to ktime_t format: */static inline ktime_t timespec64_to_ktime(struct timespec64 ts){ return ktime_set(ts.tv_sec, ts.tv_nsec);}
/* Map the ktime_t to timespec conversion to ns_to_timespec function */#define ktime_to_timespec64(kt) ns_to_timespec64((kt))
/* Convert ktime_t to nanoseconds */static inline s64 ktime_to_ns(const ktime_t kt){ return kt;}
/** * ktime_compare - Compares two ktime_t variables for less, greater or equal * @cmp1: comparable1 * @cmp2: comparable2 * * Return: ... * cmp1 < cmp2: return <0 * cmp1 == cmp2: return 0 * cmp1 > cmp2: return >0 */static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2){ if (cmp1 < cmp2) return -1; if (cmp1 > cmp2) return 1; return 0;}
/** * ktime_after - Compare if a ktime_t value is bigger than another one. * @cmp1: comparable1 * @cmp2: comparable2 * * Return: true if cmp1 happened after cmp2. */static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2){ return ktime_compare(cmp1, cmp2) > 0;}
/** * ktime_before - Compare if a ktime_t value is smaller than another one. * @cmp1: comparable1 * @cmp2: comparable2 * * Return: true if cmp1 happened before cmp2. */static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2){ return ktime_compare(cmp1, cmp2) < 0;}
#if BITS_PER_LONG < 64extern s64 __ktime_divns(const ktime_t kt, s64 div);static inline s64 ktime_divns(const ktime_t kt, s64 div){ /* * Negative divisors could cause an inf loop, * so bug out here. */ BUG_ON(div < 0); if (__builtin_constant_p(div) && !(div >> 32)) { s64 ns = kt; u64 tmp = ns < 0 ? -ns : ns;
do_div(tmp, div); return ns < 0 ? -tmp : tmp; } else { return __ktime_divns(kt, div); }}#else /* BITS_PER_LONG < 64 */static inline s64 ktime_divns(const ktime_t kt, s64 div){ /* * 32-bit implementation cannot handle negative divisors, * so catch them on 64bit as well. */ WARN_ON(div < 0); return kt / div;}#endif
static inline s64 ktime_to_us(const ktime_t kt){ return ktime_divns(kt, NSEC_PER_USEC);}
static inline s64 ktime_to_ms(const ktime_t kt){ return ktime_divns(kt, NSEC_PER_MSEC);}
static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier){ return ktime_to_us(ktime_sub(later, earlier));}
static inline s64 ktime_ms_delta(const ktime_t later, const ktime_t earlier){ return ktime_to_ms(ktime_sub(later, earlier));}
static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec){ return ktime_add_ns(kt, usec * NSEC_PER_USEC);}
static inline ktime_t ktime_add_ms(const ktime_t kt, const u64 msec){ return ktime_add_ns(kt, msec * NSEC_PER_MSEC);}
static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec){ return ktime_sub_ns(kt, usec * NSEC_PER_USEC);}
static inline ktime_t ktime_sub_ms(const ktime_t kt, const u64 msec){ return ktime_sub_ns(kt, msec * NSEC_PER_MSEC);}
extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
/** * ktime_to_timespec64_cond - convert a ktime_t variable to timespec64 * format only if the variable contains data * @kt: the ktime_t variable to convert * @ts: the timespec variable to store the result in * * Return: %true if there was a successful conversion, %false if kt was 0. */static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt, struct timespec64 *ts){ if (kt) { *ts = ktime_to_timespec64(kt); return true; } else { return false; }}
#include <vdso/ktime.h>
static inline ktime_t ns_to_ktime(u64 ns){ return ns;}
static inline ktime_t us_to_ktime(u64 us){ return us * NSEC_PER_USEC;}
static inline ktime_t ms_to_ktime(u64 ms){ return ms * NSEC_PER_MSEC;}
# include <linux/timekeeping.h>
#endif