*
* 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
* plain scalar nanosecond based representation can be selected by the
* config switch CONFIG_KTIME_SCALAR.
*/
-typedef union {
+union ktime {
s64 tv64;
#if BITS_PER_LONG != 64 && !defined(CONFIG_KTIME_SCALAR)
struct {
# endif
} tv;
#endif
-} ktime_t;
+};
-#define KTIME_MAX (~((u64)1 << 63))
+typedef union ktime ktime_t; /* Kill this */
+
+#define KTIME_MAX ((s64)~((u64)1 << 63))
+#if (BITS_PER_LONG == 64)
+# define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
+#else
+# define KTIME_SEC_MAX LONG_MAX
+#endif
/*
* ktime_t definitions when using the 64-bit scalar representation:
#if (BITS_PER_LONG == 64) || defined(CONFIG_KTIME_SCALAR)
-/* Define a ktime_t variable and initialize it to zero: */
-#define DEFINE_KTIME(kt) ktime_t kt = { .tv64 = 0 }
-
/**
* ktime_set - Set a ktime_t variable from a seconds/nanoseconds value
- *
* @secs: seconds to set
* @nsecs: nanoseconds to set
*
*/
static inline ktime_t ktime_set(const long 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 };
}
#define ktime_add_ns(kt, nsval) \
({ (ktime_t){ .tv64 = (kt).tv64 + (nsval) }; })
+/*
+ * Subtract a scalar nanosecod from a ktime_t variable
+ * res = kt - nsval:
+ */
+#define ktime_sub_ns(kt, nsval) \
+ ({ (ktime_t){ .tv64 = (kt).tv64 - (nsval) }; })
+
/* convert a timespec to ktime_t format: */
-#define timespec_to_ktime(ts) ktime_set((ts).tv_sec, (ts).tv_nsec)
+static inline ktime_t timespec_to_ktime(struct timespec ts)
+{
+ return ktime_set(ts.tv_sec, ts.tv_nsec);
+}
/* convert a timeval to ktime_t format: */
-#define timeval_to_ktime(tv) ktime_set((tv).tv_sec, (tv).tv_usec * 1000)
+static inline ktime_t timeval_to_ktime(struct timeval tv)
+{
+ return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC);
+}
/* 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 timeval conversion to ns_to_timeval function */
#define ktime_to_timeval(kt) ns_to_timeval((kt).tv64)
-/* Map the ktime_t to clock_t conversion to the inline in jiffies.h: */
-#define ktime_to_clock_t(kt) nsec_to_clock_t((kt).tv64)
-
/* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */
#define ktime_to_ns(kt) ((kt).tv64)
* tv.sec < 0 and 0 >= tv.nsec < NSEC_PER_SEC
*/
-/* Define a ktime_t variable and initialize it to zero: */
-#define DEFINE_KTIME(kt) ktime_t kt = { .tv64 = 0 }
-
/* 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)
{
/**
* ktime_sub - subtract two ktime_t variables
- *
* @lhs: minuend
* @rhs: subtrahend
*
/**
* ktime_add - add two ktime_t variables
- *
* @add1: addend1
* @add2: addend2
*
- * Returns the sum of addend1 and addend2
+ * Returns the sum of @add1 and @add2.
*/
static inline ktime_t ktime_add(const ktime_t add1, const ktime_t add2)
{
/**
* ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable
- *
* @kt: addend
* @nsec: the scalar nsec value to add
*
- * Returns the sum of kt and nsec in ktime_t format
+ * Returns the sum of @kt and @nsec in ktime_t format
*/
extern ktime_t ktime_add_ns(const ktime_t kt, u64 nsec);
/**
- * timespec_to_ktime - convert a timespec to ktime_t format
+ * ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable
+ * @kt: minuend
+ * @nsec: the scalar nsec value to subtract
*
+ * Returns 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
*
* Returns a ktime_t variable with the converted timespec value
/**
* timeval_to_ktime - convert a timeval to ktime_t format
- *
* @tv: the timeval variable to convert
*
* Returns a ktime_t variable with the converted timeval value
/**
* ktime_to_timespec - convert a ktime_t variable to timespec format
- *
* @kt: the ktime_t variable to convert
*
* Returns the timespec representation of the ktime value
/**
* ktime_to_timeval - convert a ktime_t variable to timeval format
- *
* @kt: the ktime_t variable to convert
*
* Returns the timeval representation of the ktime value
}
/**
- * ktime_to_clock_t - convert a ktime_t variable to clock_t format
+ * ktime_to_ns - convert a ktime_t variable to scalar nanoseconds
* @kt: the ktime_t variable to convert
*
- * Returns a clock_t variable with the converted value
+ * Returns the scalar nanoseconds representation of @kt
*/
-static inline clock_t ktime_to_clock_t(const ktime_t kt)
+static inline s64 ktime_to_ns(const ktime_t kt)
{
- return nsec_to_clock_t( (u64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec);
+ return (s64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec;
}
+#endif
+
/**
- * ktime_to_ns - convert a ktime_t variable to scalar nanoseconds
- * @kt: the ktime_t variable to convert
+ * ktime_equal - Compares two ktime_t variables to see if they are equal
+ * @cmp1: comparable1
+ * @cmp2: comparable2
*
- * Returns the scalar nanoseconds representation of kt
+ * Compare two ktime_t variables, returns 1 if equal
*/
-static inline u64 ktime_to_ns(const ktime_t kt)
+static inline int ktime_equal(const ktime_t cmp1, const ktime_t cmp2)
{
- return (u64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec;
+ return cmp1.tv64 == cmp2.tv64;
}
-#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;
+}
+
+static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
+{
+ return ktime_to_us(ktime_sub(later, earlier));
+}
+
+static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)
+{
+ return ktime_add_ns(kt, usec * 1000);
+}
+
+static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)
+{
+ return ktime_sub_ns(kt, usec * 1000);
+}
+
+extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
+
+/*
+ * The resolution of the clocks. The resolution value is returned in
+ * the clock_getres() system call to give application programmers an
+ * idea of the (in)accuracy of timers. Timer values are rounded up to
+ * this resolution values.
+ */
+#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_ns(ktime_zero, ns);
+}
#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff