From c7c2c3a28657cfdcef50c02b18ccca3761209e17 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Mon, 8 Nov 2010 14:26:36 -0500 Subject: 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 --- drivers/xen/events.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/xen') diff --git a/drivers/xen/events.c b/drivers/xen/events.c index ac0e22826357..0ac7a149e7f2 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -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; -- cgit v1.2.3-59-g8ed1b