Time for which the hrtimer is started for decrementer emulation is calculated
using tb_ticks_per_usec. While hrtimer uses the clockevent for DEC
reprogramming (if needed) and which calculate timebase ticks using the
multiplier and shifter mechanism implemented within clockevent layer. It was
observed that this conversion (timebase->time->timebase) are not correct
because the mechanism are not consistent. In our setup it adds 2% jitter.
With this patch clockevent multiplier and shifter mechanism are used when
starting hrtimer for decrementer emulation. Now the jitter is < 0.5%.
Signed-off-by: Bharat Bhushan <bharat.bhus...@freescale.com>
---
v4:
- Added comment in emulate.c
arch/powerpc/include/asm/time.h | 1 +
arch/powerpc/kernel/time.c | 3 ++-
arch/powerpc/kvm/emulate.c | 9 +++++++--
3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index 7eb10fb..b3c7959 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -28,6 +28,7 @@
extern unsigned long tb_ticks_per_jiffy;
extern unsigned long tb_ticks_per_usec;
extern unsigned long tb_ticks_per_sec;
+extern struct clock_event_device decrementer_clockevent;
struct rtc_time;
extern void to_tm(int tim, struct rtc_time * tm);
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 567dd7c..4f7a285 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -105,7 +105,7 @@ static int decrementer_set_next_event(unsigned long evt,
static void decrementer_set_mode(enum clock_event_mode mode,
struct clock_event_device *dev);
-static struct clock_event_device decrementer_clockevent = {
+struct clock_event_device decrementer_clockevent = {
.name = "decrementer",
.rating = 200,
.irq = 0,
@@ -113,6 +113,7 @@ static struct clock_event_device decrementer_clockevent = {
.set_mode = decrementer_set_mode,
.features = CLOCK_EVT_FEAT_ONESHOT,
};
+EXPORT_SYMBOL(decrementer_clockevent);
DEFINE_PER_CPU(u64, decrementers_next_tb);
static DEFINE_PER_CPU(struct clock_event_device, decrementers);
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index afc9154..550a058 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -23,6 +23,7 @@
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm_host.h>
+#include <linux/clockchips.h>
#include <asm/reg.h>
#include <asm/time.h>
@@ -104,8 +105,12 @@ void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
*/
dec_time = vcpu->arch.dec;
- dec_time *= 1000;
- do_div(dec_time, tb_ticks_per_usec);
+ /*
+ * Guest timebase ticks at the same frequency as host decrementer.
+ * So use the host decrementer calculations for decrementer emulation.
+ */
+ dec_time = dec_time << decrementer_clockevent.shift;
+ do_div(dec_time, decrementer_clockevent.mult);
dec_nsec = do_div(dec_time, NSEC_PER_SEC);
hrtimer_start(&vcpu->arch.dec_timer,
ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
--
1.7.0.4
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