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-rw-r--r--arch/x86/include/asm/vgtod.h1
-rw-r--r--arch/x86/kernel/i8253.c19
-rw-r--r--arch/x86/kernel/rtc.c5
-rw-r--r--arch/x86/kernel/tsc.c14
-rw-r--r--arch/x86/kernel/vsyscall_64.c1
-rw-r--r--arch/x86/vdso/vclock_gettime.c39
6 files changed, 52 insertions, 27 deletions
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index dc27a69e5d2..3d61e204826 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -21,6 +21,7 @@ struct vsyscall_gtod_data {
u32 shift;
} clock;
struct timespec wall_to_monotonic;
+ struct timespec wall_time_coarse;
};
extern struct vsyscall_gtod_data __vsyscall_gtod_data
__section_vsyscall_gtod_data;
diff --git a/arch/x86/kernel/i8253.c b/arch/x86/kernel/i8253.c
index 5cf36c053ac..23c167925a5 100644
--- a/arch/x86/kernel/i8253.c
+++ b/arch/x86/kernel/i8253.c
@@ -19,12 +19,6 @@
DEFINE_SPINLOCK(i8253_lock);
EXPORT_SYMBOL(i8253_lock);
-#ifdef CONFIG_X86_32
-static void pit_disable_clocksource(void);
-#else
-static inline void pit_disable_clocksource(void) { }
-#endif
-
/*
* HPET replaces the PIT, when enabled. So we need to know, which of
* the two timers is used
@@ -57,12 +51,10 @@ static void init_pit_timer(enum clock_event_mode mode,
outb_pit(0, PIT_CH0);
outb_pit(0, PIT_CH0);
}
- pit_disable_clocksource();
break;
case CLOCK_EVT_MODE_ONESHOT:
/* One shot setup */
- pit_disable_clocksource();
outb_pit(0x38, PIT_MODE);
break;
@@ -200,17 +192,6 @@ static struct clocksource pit_cs = {
.shift = 20,
};
-static void pit_disable_clocksource(void)
-{
- /*
- * Use mult to check whether it is registered or not
- */
- if (pit_cs.mult) {
- clocksource_unregister(&pit_cs);
- pit_cs.mult = 0;
- }
-}
-
static int __init init_pit_clocksource(void)
{
/*
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 5d465b207e7..bf67dcb4a44 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -178,7 +178,7 @@ static int set_rtc_mmss(unsigned long nowtime)
}
/* not static: needed by APM */
-unsigned long read_persistent_clock(void)
+void read_persistent_clock(struct timespec *ts)
{
unsigned long retval, flags;
@@ -186,7 +186,8 @@ unsigned long read_persistent_clock(void)
retval = get_wallclock();
spin_unlock_irqrestore(&rtc_lock, flags);
- return retval;
+ ts->tv_sec = retval;
+ ts->tv_nsec = 0;
}
int update_persistent_clock(struct timespec now)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 71f4368b357..fc3672a303d 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -744,10 +744,16 @@ static cycle_t __vsyscall_fn vread_tsc(void)
}
#endif
+static void resume_tsc(void)
+{
+ clocksource_tsc.cycle_last = 0;
+}
+
static struct clocksource clocksource_tsc = {
.name = "tsc",
.rating = 300,
.read = read_tsc,
+ .resume = resume_tsc,
.mask = CLOCKSOURCE_MASK(64),
.shift = 22,
.flags = CLOCK_SOURCE_IS_CONTINUOUS |
@@ -761,12 +767,14 @@ void mark_tsc_unstable(char *reason)
{
if (!tsc_unstable) {
tsc_unstable = 1;
- printk("Marking TSC unstable due to %s\n", reason);
+ printk(KERN_INFO "Marking TSC unstable due to %s\n", reason);
/* Change only the rating, when not registered */
if (clocksource_tsc.mult)
- clocksource_change_rating(&clocksource_tsc, 0);
- else
+ clocksource_mark_unstable(&clocksource_tsc);
+ else {
+ clocksource_tsc.flags |= CLOCK_SOURCE_UNSTABLE;
clocksource_tsc.rating = 0;
+ }
}
}
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 25ee06a80aa..cf53a78e2dc 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -87,6 +87,7 @@ void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
vsyscall_gtod_data.wall_to_monotonic = wall_to_monotonic;
+ vsyscall_gtod_data.wall_time_coarse = __current_kernel_time();
write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
}
diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 6a40b78b46a..ee55754cc3c 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -86,14 +86,47 @@ notrace static noinline int do_monotonic(struct timespec *ts)
return 0;
}
+notrace static noinline int do_realtime_coarse(struct timespec *ts)
+{
+ unsigned long seq;
+ do {
+ seq = read_seqbegin(&gtod->lock);
+ ts->tv_sec = gtod->wall_time_coarse.tv_sec;
+ ts->tv_nsec = gtod->wall_time_coarse.tv_nsec;
+ } while (unlikely(read_seqretry(&gtod->lock, seq)));
+ return 0;
+}
+
+notrace static noinline int do_monotonic_coarse(struct timespec *ts)
+{
+ unsigned long seq, ns, secs;
+ do {
+ seq = read_seqbegin(&gtod->lock);
+ secs = gtod->wall_time_coarse.tv_sec;
+ ns = gtod->wall_time_coarse.tv_nsec;
+ secs += gtod->wall_to_monotonic.tv_sec;
+ ns += gtod->wall_to_monotonic.tv_nsec;
+ } while (unlikely(read_seqretry(&gtod->lock, seq)));
+ vset_normalized_timespec(ts, secs, ns);
+ return 0;
+}
+
notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
{
- if (likely(gtod->sysctl_enabled && gtod->clock.vread))
+ if (likely(gtod->sysctl_enabled))
switch (clock) {
case CLOCK_REALTIME:
- return do_realtime(ts);
+ if (likely(gtod->clock.vread))
+ return do_realtime(ts);
+ break;
case CLOCK_MONOTONIC:
- return do_monotonic(ts);
+ if (likely(gtod->clock.vread))
+ return do_monotonic(ts);
+ break;
+ case CLOCK_REALTIME_COARSE:
+ return do_realtime_coarse(ts);
+ case CLOCK_MONOTONIC_COARSE:
+ return do_monotonic_coarse(ts);
}
return vdso_fallback_gettime(clock, ts);
}