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authorJeremy Fitzhardinge <jeremy@goop.org>2008-05-26 18:31:23 -0400
committerThomas Gleixner <tglx@linutronix.de>2008-05-27 04:11:37 -0400
commiteb1e305f4ef201e549ffd475b7dcbcd4ec36d7dc (patch)
tree078c5acb7d6ca6e3f24b45c5d4a660abcdc75202 /drivers/xen/events.c
parentd5edbc1f75420935b1ec7e65df10c8f81cea82de (diff)
xen: add rebind_evtchn_irq
Add rebind_evtchn_irq(), which will rebind an device driver's existing irq to a new event channel on restore. Since the new event channel will be masked and bound to vcpu0, we update the state accordingly and unmask the irq once everything is set up. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/xen/events.c')
-rw-r--r--drivers/xen/events.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 4f0f22b020ea..f64e9798129c 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -557,6 +557,33 @@ out:
557 put_cpu(); 557 put_cpu();
558} 558}
559 559
560/* Rebind a new event channel to an existing irq. */
561void rebind_evtchn_irq(int evtchn, int irq)
562{
563 /* Make sure the irq is masked, since the new event channel
564 will also be masked. */
565 disable_irq(irq);
566
567 spin_lock(&irq_mapping_update_lock);
568
569 /* After resume the irq<->evtchn mappings are all cleared out */
570 BUG_ON(evtchn_to_irq[evtchn] != -1);
571 /* Expect irq to have been bound before,
572 so the bindcount should be non-0 */
573 BUG_ON(irq_bindcount[irq] == 0);
574
575 evtchn_to_irq[evtchn] = irq;
576 irq_info[irq] = mk_irq_info(IRQT_EVTCHN, 0, evtchn);
577
578 spin_unlock(&irq_mapping_update_lock);
579
580 /* new event channels are always bound to cpu 0 */
581 irq_set_affinity(irq, cpumask_of_cpu(0));
582
583 /* Unmask the event channel. */
584 enable_irq(irq);
585}
586
560/* Rebind an evtchn so that it gets delivered to a specific cpu */ 587/* Rebind an evtchn so that it gets delivered to a specific cpu */
561static void rebind_irq_to_cpu(unsigned irq, unsigned tcpu) 588static void rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
562{ 589{