linux-kernel - [PATCH WIP 6/6] xen/arm: enable evtchn irqs

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Date:	Fri, 22 Jun 2012 17:14:45 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<xen-devel@...ts.xensource.com>,
	<Stefano.Stabellini@...citrix.com>, <Ian.Campbell@...rix.com>,
	<tim@....org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: [PATCH WIP 6/6] xen/arm: enable evtchn irqs

On ARM irqs are not enabled by default:

- call enable_percpu_irq for IRQ_EVTCHN_CALLBACK;

- set the IRQF_VALID flag for the other irqs bound to evtchns. It causes
IRQ_NOAUTOEN to be set and as a consequence irq_unmask is going to be
called when a xenbus driver calls request_irq.

Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
---
 drivers/xen/events.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 0132505..ca92755 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -53,6 +53,7 @@
 #include <xen/interface/hvm/params.h>
 #include <xen/interface/physdev.h>
 #include <xen/interface/sched.h>
+#include <asm/hw_irq.h>
 
 /*
  * This lock protects updates to the following mapping and reference-count
@@ -827,6 +828,7 @@ int bind_evtchn_to_irq(unsigned int evtchn)
 
 		xen_irq_info_evtchn_init(irq, evtchn);
 	}
+	set_irq_flags(irq, IRQF_VALID);
 
 out:
 	mutex_unlock(&irq_mapping_update_lock);
@@ -1751,6 +1753,7 @@ int __init xen_init_IRQ_arm(void)
 	if (rc) {
 		printk(KERN_ERR "Error requesting IRQ %d\n", IRQ_EVTCHN_CALLBACK);
 	}
+	enable_percpu_irq(IRQ_EVTCHN_CALLBACK, 0);
 	return rc;
 }
 core_initcall(xen_init_IRQ_arm);
-- 
1.7.2.5

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