powerpc/time: Handle wrapping of decrementer

BugLink: http://bugs.launchpad.net/bugs/915926

commit 37fb9a0231ee43d42d069863bdfd567fca2b61af upstream.

When re-enabling interrupts we have code to handle edge sensitive
decrementers by resetting the decrementer to 1 whenever it is negative.
If interrupts were disabled long enough that the decrementer wrapped to
positive we do nothing. This means interrupts can be delayed for a long
time until it finally goes negative again.

While we hope interrupts are never be disabled long enough for the
decrementer to go positive, we have a very good test team that can
drive any kernel into the ground. The softlockup data we get back
from these fails could be seconds in the future, completely missing
the cause of the lockup.

We already keep track of the timebase of the next event so use that
to work out if we should trigger a decrementer exception.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Brad Figg <brad.figg@canonical.com>

2 files changed, 15 insertions, 9 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 5b428e30866..ca2987d939f 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -170,16 +170,13 @@ notrace void arch_local_irq_restore(unsigned long en)
          */
         local_paca->hard_enabled = en;
 
-#ifndef CONFIG_BOOKE
-        /* On server, re-trigger the decrementer if it went negative since
-         * some processors only trigger on edge transitions of the sign bit.
-         *
-         * BookE has a level sensitive decrementer (latches in TSR) so we
-         * don't need that
+        /*
+         * Trigger the decrementer if we have a pending event. Some processors
+         * only trigger on edge transitions of the sign bit. We might also
+         * have disabled interrupts long enough that the decrementer wrapped
+         * to positive.
          */
-        if ((int)mfspr(SPRN_DEC) < 0)
-                mtspr(SPRN_DEC, 1);
-#endif /* CONFIG_BOOKE */
+        decrementer_check_overflow();
 
         /*
          * Force the delivery of pending soft-disabled interrupts on PS3.
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 03b29a6759a..2de304af07a 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -889,6 +889,15 @@ static void __init clocksource_init(void)
                clock->name, clock->mult, clock->shift);
 }
 
+void decrementer_check_overflow(void)
+{
+        u64 now = get_tb_or_rtc();
+        struct decrementer_clock *decrementer = &__get_cpu_var(decrementers);
+
+        if (now >= decrementer->next_tb)
+                set_dec(1);
+}
+
 static int decrementer_set_next_event(unsigned long evt,
                                       struct clock_event_device *dev)
 {