| /* |
| * include/linux/ktime.h |
| * |
| * ktime_t - nanosecond-resolution time format. |
| * |
| * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> |
| * 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 <linux/time.h> |
| #include <linux/jiffies.h> |
| #include <asm/bug.h> |
| |
| /* Nanosecond scalar representation for kernel time values */ |
| typedef s64 ktime_t; |
| |
| /** |
| * 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 < 64 |
| extern 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 ms_to_ktime(u64 ms) |
| { |
| return ms * NSEC_PER_MSEC; |
| } |
| |
| # include <linux/timekeeping.h> |
| |
| #endif |