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xen/irq: Add support to check if IRQ line is shared with other domains. 

We do this via the PHYSDEVOP_irq_status_query support hypervisor call.
We will get a positive value if another domain has binded its
PIRQ to the specified GSI (IRQ line).

[v2: Deal with v2.6.37-rc1 rebase fallout]
[v3: Deal with stable/irq.cleanup fallout]
[v4: xen_ignore_irq->xen_test_irq_shared]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2010-11-08 14:26:36 -05:00
parent beafbdc1df
commit c7c2c3a286
2 changed files with 15 additions and 0 deletions
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12
drivers/xen/events.c
View File

@ -1508,6 +1508,18 @@ void xen_poll_irq(int irq)
xen_poll_irq_timeout(irq, 0 /* no timeout */);
}
/* Check whether the IRQ line is shared with other guests. */
int xen_test_irq_shared(int irq)
{
struct irq_info *info = info_for_irq(irq);
struct physdev_irq_status_query irq_status = { .irq = info->u.pirq.pirq };
if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
return 0;
return !(irq_status.flags & XENIRQSTAT_shared);
}
EXPORT_SYMBOL_GPL(xen_test_irq_shared);
void xen_irq_resume(void)
{
unsigned int cpu, evtchn;

3
include/xen/events.h
View File

@ -95,4 +95,7 @@ int xen_destroy_irq(int irq);
/* Return irq from pirq */
int xen_irq_from_pirq(unsigned pirq);
/* Determine whether to ignore this IRQ if it is passed to a guest. */
int xen_test_irq_shared(int irq);
#endif /* _XEN_EVENTS_H */