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xen/events: introduce test_and_set_mask() 

In preparation for adding event channel port ops, add
test_and_set_mask().

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Wei Liu 2013-03-07 15:50:27 +00:00 committed by Konrad Rzeszutek Wilk
parent fc087e1073
commit 3f70fa8282
1 changed files with 8 additions and 3 deletions
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11
drivers/xen/events.c
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@ -352,6 +352,12 @@ static inline int test_evtchn(int port)
return sync_test_bit(port, BM(&s->evtchn_pending[0]));
}
static inline int test_and_set_mask(int port)
{
struct shared_info *s = HYPERVISOR_shared_info;
return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0]));
}
/**
* notify_remote_via_irq - send event to remote end of event channel via irq
@ -1493,7 +1499,6 @@ void rebind_evtchn_irq(int evtchn, int irq)
/* Rebind an evtchn so that it gets delivered to a specific cpu */
static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
{
struct shared_info *s = HYPERVISOR_shared_info;
struct evtchn_bind_vcpu bind_vcpu;
int evtchn = evtchn_from_irq(irq);
int masked;
@ -1516,7 +1521,7 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
* Mask the event while changing the VCPU binding to prevent
* it being delivered on an unexpected VCPU.
*/
masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
masked = test_and_set_mask(evtchn);
/*
* If this fails, it usually just indicates that we're dealing with a
@ -1548,7 +1553,7 @@ static int retrigger_evtchn(int evtchn)
if (!VALID_EVTCHN(evtchn))
return 0;
masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
masked = test_and_set_mask(evtchn);
sync_set_bit(evtchn, BM(s->evtchn_pending));
if (!masked)
unmask_evtchn(evtchn);