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| author |   Ingo Molnar <mingo@elte.hu> | 2008-07-21 16:45:56 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-21 16:45:56 +0200 |
| commit | 2e2dcc7631e331cf2e8396ce452e7f01e35f1182 (patch) | |
| tree | 5a02c9602db66bc8c8db9660899c0c4455d7464f /drivers/xen | |
| parent | Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus (diff) | |
| parent | Merge branch 'linus' into x86/paravirt-spinlocks (diff) | |
| download | linux-dev-2e2dcc7631e331cf2e8396ce452e7f01e35f1182.tar.xz linux-dev-2e2dcc7631e331cf2e8396ce452e7f01e35f1182.zip | |
Merge branch 'x86/paravirt-spinlocks' into x86/for-linus
Diffstat (limited to 'drivers/xen')
| -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 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; |