/*
* ktime_t:
*
- * On 64-bit CPUs a single 64-bit variable is used to store the hrtimers
+ * A single 64-bit variable is used to store the hrtimers
* internal representation of time values in scalar nanoseconds. The
* design plays out best on 64-bit CPUs, where most conversions are
* NOPs and most arithmetic ktime_t operations are plain arithmetic
* operations.
*
- * On 32-bit CPUs an optimized representation of the timespec structure
- * is used to avoid expensive conversions from and to timespecs. The
- * endian-aware order of the tv struct members is chosen to allow
- * mathematical operations on the tv64 member of the union too, which
- * for certain operations produces better code.
- *
- * For architectures with efficient support for 64/32-bit conversions the
- * plain scalar nanosecond based representation can be selected by the
- * config switch CONFIG_KTIME_SCALAR.
*/
union ktime {
s64 tv64;
-#if BITS_PER_LONG != 64 && !defined(CONFIG_KTIME_SCALAR)
- struct {
-# ifdef __BIG_ENDIAN
- s32 sec, nsec;
-# else
- s32 nsec, sec;
-# endif
- } tv;
-#endif
};
typedef union ktime ktime_t; /* Kill this */
-/*
- * ktime_t definitions when using the 64-bit scalar representation:
- */
-
-#if (BITS_PER_LONG == 64) || defined(CONFIG_KTIME_SCALAR)
-
/**
* ktime_set - Set a ktime_t variable from a seconds/nanoseconds value
* @secs: seconds to set
*
* Return: The ktime_t representation of the value.
*/
-static inline ktime_t ktime_set(const long secs, const unsigned long nsecs)
+static inline ktime_t ktime_set(const s64 secs, const unsigned long nsecs)
{
-#if (BITS_PER_LONG == 64)
if (unlikely(secs >= KTIME_SEC_MAX))
return (ktime_t){ .tv64 = KTIME_MAX };
-#endif
- return (ktime_t) { .tv64 = (s64)secs * NSEC_PER_SEC + (s64)nsecs };
+
+ return (ktime_t) { .tv64 = secs * NSEC_PER_SEC + (s64)nsecs };
}
/* Subtract two ktime_t variables. rem = lhs -rhs: */
return ktime_set(ts.tv_sec, ts.tv_nsec);
}
+/* 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);
+}
+
/* convert a timeval to ktime_t format: */
static inline ktime_t timeval_to_ktime(struct timeval tv)
{
/* Map the ktime_t to timespec conversion to ns_to_timespec function */
#define ktime_to_timespec(kt) ns_to_timespec((kt).tv64)
+/* Map the ktime_t to timespec conversion to ns_to_timespec function */
+#define ktime_to_timespec64(kt) ns_to_timespec64((kt).tv64)
+
/* Map the ktime_t to timeval conversion to ns_to_timeval function */
#define ktime_to_timeval(kt) ns_to_timeval((kt).tv64)
/* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */
#define ktime_to_ns(kt) ((kt).tv64)
-#else /* !((BITS_PER_LONG == 64) || defined(CONFIG_KTIME_SCALAR)) */
-
-/*
- * Helper macros/inlines to get the ktime_t math right in the timespec
- * representation. The macros are sometimes ugly - their actual use is
- * pretty okay-ish, given the circumstances. We do all this for
- * performance reasons. The pure scalar nsec_t based code was nice and
- * simple, but created too many 64-bit / 32-bit conversions and divisions.
- *
- * Be especially aware that negative values are represented in a way
- * that the tv.sec field is negative and the tv.nsec field is greater
- * or equal to zero but less than nanoseconds per second. This is the
- * same representation which is used by timespecs.
- *
- * tv.sec < 0 and 0 >= tv.nsec < NSEC_PER_SEC
- */
-
-/* Set a ktime_t variable to a value in sec/nsec representation: */
-static inline ktime_t ktime_set(const long secs, const unsigned long nsecs)
-{
- return (ktime_t) { .tv = { .sec = secs, .nsec = nsecs } };
-}
-
-/**
- * ktime_sub - subtract two ktime_t variables
- * @lhs: minuend
- * @rhs: subtrahend
- *
- * Return: The remainder of the subtraction.
- */
-static inline ktime_t ktime_sub(const ktime_t lhs, const ktime_t rhs)
-{
- ktime_t res;
-
- res.tv64 = lhs.tv64 - rhs.tv64;
- if (res.tv.nsec < 0)
- res.tv.nsec += NSEC_PER_SEC;
-
- return res;
-}
-
-/**
- * ktime_add - add two ktime_t variables
- * @add1: addend1
- * @add2: addend2
- *
- * Return: The sum of @add1 and @add2.
- */
-static inline ktime_t ktime_add(const ktime_t add1, const ktime_t add2)
-{
- ktime_t res;
-
- res.tv64 = add1.tv64 + add2.tv64;
- /*
- * performance trick: the (u32) -NSEC gives 0x00000000Fxxxxxxx
- * so we subtract NSEC_PER_SEC and add 1 to the upper 32 bit.
- *
- * it's equivalent to:
- * tv.nsec -= NSEC_PER_SEC
- * tv.sec ++;
- */
- if (res.tv.nsec >= NSEC_PER_SEC)
- res.tv64 += (u32)-NSEC_PER_SEC;
-
- return res;
-}
-
-/**
- * ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable
- * @kt: addend
- * @nsec: the scalar nsec value to add
- *
- * Return: The sum of @kt and @nsec in ktime_t format.
- */
-extern ktime_t ktime_add_ns(const ktime_t kt, u64 nsec);
-
-/**
- * ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable
- * @kt: minuend
- * @nsec: the scalar nsec value to subtract
- *
- * Return: The subtraction of @nsec from @kt in ktime_t format.
- */
-extern ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec);
-
-/**
- * timespec_to_ktime - convert a timespec to ktime_t format
- * @ts: the timespec variable to convert
- *
- * Return: A ktime_t variable with the converted timespec value.
- */
-static inline ktime_t timespec_to_ktime(const struct timespec ts)
-{
- return (ktime_t) { .tv = { .sec = (s32)ts.tv_sec,
- .nsec = (s32)ts.tv_nsec } };
-}
-
-/**
- * timeval_to_ktime - convert a timeval to ktime_t format
- * @tv: the timeval variable to convert
- *
- * Return: A ktime_t variable with the converted timeval value.
- */
-static inline ktime_t timeval_to_ktime(const struct timeval tv)
-{
- return (ktime_t) { .tv = { .sec = (s32)tv.tv_sec,
- .nsec = (s32)(tv.tv_usec *
- NSEC_PER_USEC) } };
-}
-
-/**
- * ktime_to_timespec - convert a ktime_t variable to timespec format
- * @kt: the ktime_t variable to convert
- *
- * Return: The timespec representation of the ktime value.
- */
-static inline struct timespec ktime_to_timespec(const ktime_t kt)
-{
- return (struct timespec) { .tv_sec = (time_t) kt.tv.sec,
- .tv_nsec = (long) kt.tv.nsec };
-}
-
-/**
- * ktime_to_timeval - convert a ktime_t variable to timeval format
- * @kt: the ktime_t variable to convert
- *
- * Return: The timeval representation of the ktime value.
- */
-static inline struct timeval ktime_to_timeval(const ktime_t kt)
-{
- return (struct timeval) {
- .tv_sec = (time_t) kt.tv.sec,
- .tv_usec = (suseconds_t) (kt.tv.nsec / NSEC_PER_USEC) };
-}
-
-/**
- * ktime_to_ns - convert a ktime_t variable to scalar nanoseconds
- * @kt: the ktime_t variable to convert
- *
- * Return: The scalar nanoseconds representation of @kt.
- */
-static inline s64 ktime_to_ns(const ktime_t kt)
-{
- return (s64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec;
-}
-
-#endif /* !((BITS_PER_LONG == 64) || defined(CONFIG_KTIME_SCALAR)) */
/**
* ktime_equal - Compares two ktime_t variables to see if they are equal
return ktime_compare(cmp1, cmp2) < 0;
}
+#if BITS_PER_LONG < 64
+extern u64 ktime_divns(const ktime_t kt, s64 div);
+#else /* BITS_PER_LONG < 64 */
+# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
+#endif
+
static inline s64 ktime_to_us(const ktime_t kt)
{
- struct timeval tv = ktime_to_timeval(kt);
- return (s64) tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
+ return ktime_divns(kt, NSEC_PER_USEC);
}
static inline s64 ktime_to_ms(const ktime_t kt)
{
- struct timeval tv = ktime_to_timeval(kt);
- return (s64) tv.tv_sec * MSEC_PER_SEC + tv.tv_usec / USEC_PER_MSEC;
+ return ktime_divns(kt, NSEC_PER_MSEC);
}
static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
}
}
+/**
+ * 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.tv64) {
+ *ts = ktime_to_timespec64(kt);
+ return true;
+ } else {
+ return false;
+ }
+}
+
/*
* The resolution of the clocks. The resolution value is returned in
* the clock_getres() system call to give application programmers an
#define LOW_RES_NSEC TICK_NSEC
#define KTIME_LOW_RES (ktime_t){ .tv64 = LOW_RES_NSEC }
-/* Get the monotonic time in timespec format: */
-extern void ktime_get_ts(struct timespec *ts);
-
-/* Get the real (wall-) time in timespec format: */
-#define ktime_get_real_ts(ts) getnstimeofday(ts)
-
static inline ktime_t ns_to_ktime(u64 ns)
{
static const ktime_t ktime_zero = { .tv64 = 0 };
return ktime_add_ms(ktime_zero, ms);
}
+# include <linux/timekeeping.h>
+
#endif
git.openpandora.org / pandora-kernel.git / blobdiff