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

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Message-ID: <20120719233045.GA944@phenom.dumpdata.com>
Date:	Thu, 19 Jul 2012 19:30:45 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"Tim (Xen.org)" <tim@....org>
Subject: Re: [PATCH WIP 6/6] xen/arm: enable evtchn irqs

> > OK, please include those questions/answers in the git commit and
> > repost.

I seem to be missing the rest of the patches. I see the drivers/xen/events also
has the  xen_init_IRQ_arm... is there a git tree with the base patches?
> 
> ---
> 
> xen/arm: enable evtchn irqs
> 
> On ARM Linux irqs are not enabled by default:
> 
> - call enable_percpu_irq for IRQ_EVTCHN_CALLBACK (drivers are supposed
> to call enable_irq after request_irq);
> 
> - 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.
> This is needed because IRQ_NOAUTOEN is set by set_irq_flags on ARM.
> If IRQ_NOAUTOEN is set __setup_irq doesn't call irq_startup that is
> responsible for calling irq_unmask at startup time.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> index eae0d0b..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
> @@ -824,6 +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);
> @@ -1748,6 +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);
--
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