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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2010-11-08 14:26:36 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-04-14 11:17:54 -0400
commitc7c2c3a28657cfdcef50c02b18ccca3761209e17 (patch)
treefc2a2c0652a61d9b0f582c33cfa4c75b3bd8a654 /drivers
parentbeafbdc1df02877612dc9039c1de0639921fddec (diff)
downloadop-kernel-dev-c7c2c3a28657cfdcef50c02b18ccca3761209e17.zip
op-kernel-dev-c7c2c3a28657cfdcef50c02b18ccca3761209e17.tar.gz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/xen/events.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index ac0e228..0ac7a14 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;
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