u32 shift;
} clock;
- /* open coded 'struct timespec' */
- u64 monotonic_time_snsec;
- time_t monotonic_time_sec;
+ u64 boot_ns;
+ u64 nsec_base;
};
static struct pvclock_gtod_data pvclock_gtod_data;
static void update_pvclock_gtod(struct timekeeper *tk)
{
struct pvclock_gtod_data *vdata = &pvclock_gtod_data;
+ u64 boot_ns;
+
+ boot_ns = ktime_to_ns(ktime_add(tk->tkr.base_mono, tk->offs_boot));
write_seqcount_begin(&vdata->seq);
/* copy pvclock gtod data */
- vdata->clock.vclock_mode = tk->clock->archdata.vclock_mode;
- vdata->clock.cycle_last = tk->clock->cycle_last;
- vdata->clock.mask = tk->clock->mask;
- vdata->clock.mult = tk->mult;
- vdata->clock.shift = tk->shift;
-
- vdata->monotonic_time_sec = tk->xtime_sec
- + tk->wall_to_monotonic.tv_sec;
- vdata->monotonic_time_snsec = tk->xtime_nsec
- + (tk->wall_to_monotonic.tv_nsec
- << tk->shift);
- while (vdata->monotonic_time_snsec >=
- (((u64)NSEC_PER_SEC) << tk->shift)) {
- vdata->monotonic_time_snsec -=
- ((u64)NSEC_PER_SEC) << tk->shift;
- vdata->monotonic_time_sec++;
- }
+ vdata->clock.vclock_mode = tk->tkr.clock->archdata.vclock_mode;
+ vdata->clock.cycle_last = tk->tkr.cycle_last;
+ vdata->clock.mask = tk->tkr.mask;
+ vdata->clock.mult = tk->tkr.mult;
+ vdata->clock.shift = tk->tkr.shift;
+
+ vdata->boot_ns = boot_ns;
+ vdata->nsec_base = tk->tkr.xtime_nsec;
write_seqcount_end(&vdata->seq);
}
static inline u64 get_kernel_ns(void)
{
- struct timespec ts;
-
- ktime_get_ts(&ts);
- monotonic_to_bootbased(&ts);
- return timespec_to_ns(&ts);
+ return ktime_get_boot_ns();
}
#ifdef CONFIG_X86_64
return v * gtod->clock.mult;
}
-static int do_monotonic(struct timespec *ts, cycle_t *cycle_now)
+static int do_monotonic_boot(s64 *t, cycle_t *cycle_now)
{
+ struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
unsigned long seq;
- u64 ns;
int mode;
- struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
+ u64 ns;
- ts->tv_nsec = 0;
do {
seq = read_seqcount_begin(>od->seq);
mode = gtod->clock.vclock_mode;
- ts->tv_sec = gtod->monotonic_time_sec;
- ns = gtod->monotonic_time_snsec;
+ ns = gtod->nsec_base;
ns += vgettsc(cycle_now);
ns >>= gtod->clock.shift;
+ ns += gtod->boot_ns;
} while (unlikely(read_seqcount_retry(>od->seq, seq)));
- timespec_add_ns(ts, ns);
+ *t = ns;
return mode;
}
/* returns true if host is using tsc clocksource */
static bool kvm_get_time_and_clockread(s64 *kernel_ns, cycle_t *cycle_now)
{
- struct timespec ts;
-
/* checked again under seqlock below */
if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC)
return false;
- if (do_monotonic(&ts, cycle_now) != VCLOCK_TSC)
- return false;
-
- monotonic_to_bootbased(&ts);
- *kernel_ns = timespec_to_ns(&ts);
-
- return true;
+ return do_monotonic_boot(kernel_ns, cycle_now) == VCLOCK_TSC;
}
#endif