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author | Ingo Molnar <mingo@elte.hu> | 2008-07-21 14:45:56 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-21 14:45:56 (GMT) |
commit | 2e2dcc7631e331cf2e8396ce452e7f01e35f1182 (patch) | |
tree | 5a02c9602db66bc8c8db9660899c0c4455d7464f /drivers | |
parent | acee709cab689ec7703770e8b8cb5cc3a4abcb31 (diff) | |
parent | 1c29dd9a9e2f83ffb02e50bb3619c3b9db8fd526 (diff) | |
download | linux-2e2dcc7631e331cf2e8396ce452e7f01e35f1182.tar.xz |
Merge branch 'x86/paravirt-spinlocks' into x86/for-linus
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/xen/events.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 332dd637..0e0c285 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; |