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authorIngo Molnar <mingo@elte.hu>2008-07-21 18:45:56 +0400
committerIngo Molnar <mingo@elte.hu>2008-07-21 18:45:56 +0400
commit2e2dcc7631e331cf2e8396ce452e7f01e35f1182 (patch)
tree5a02c9602db66bc8c8db9660899c0c4455d7464f /drivers/xen
parentacee709cab689ec7703770e8b8cb5cc3a4abcb31 (diff)
parent1c29dd9a9e2f83ffb02e50bb3619c3b9db8fd526 (diff)
downloadlinux-2e2dcc7631e331cf2e8396ce452e7f01e35f1182.tar.xz
Merge branch 'x86/paravirt-spinlocks' into x86/for-linus
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/events.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 332dd63750a0..0e0c28574af8 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -734,6 +734,33 @@ static void restore_cpu_ipis(unsigned int cpu)
}
}
+/* Clear an irq's pending state, in preparation for polling on it */
+void xen_clear_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn))
+ clear_evtchn(evtchn);
+}
+
+/* Poll waiting for an irq to become pending. In the usual case, the
+ irq will be disabled so it won't deliver an interrupt. */
+void xen_poll_irq(int irq)
+{
+ evtchn_port_t evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn)) {
+ struct sched_poll poll;
+
+ poll.nr_ports = 1;
+ poll.timeout = 0;
+ poll.ports = &evtchn;
+
+ if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
+ BUG();
+ }
+}
+
void xen_irq_resume(void)
{
unsigned int cpu, irq, evtchn;