linux-kernel - Re: [PATCH-WIP 07/13] xen/arm: receive xen events on arm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.00.1202241221440.23091@kaball-desktop>
Date:	Fri, 24 Feb 2012 12:23:33 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: Re: [PATCH-WIP 07/13] xen/arm: receive xen events on arm

On Fri, 24 Feb 2012, David Vrabel wrote:
> On 23/02/12 17:48, Stefano Stabellini wrote:
> > Compile events.c and use IRQ 32 to receive events notifications.
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> > +#ifdef CONFIG_ARM
> > +#define IRQ_EVTCHN_CALLBACK 63
> > +irqreturn_t xen_arm_callback(int irq, void *arg)
> > +{
> > +	__xen_evtchn_do_upcall();
> > +	return 0;
> > +}
> > +
> > +int __init xen_init_IRQ_arm(void)
> > +{
> > +	int rc;
> > +	xen_init_IRQ();
> > +	rc = request_irq(IRQ_EVTCHN_CALLBACK, xen_arm_callback,
> > +			IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
> > +			"events", "events");	
> > +	if (rc) {
> > +		printk(KERN_ERR "Error requesting IRQ %d\n", IRQ_EVTCHN_CALLBACK);
> > +	}
> > +	return rc;
> > +}
> > +core_initcall(xen_init_IRQ_arm);
> > +#endif
> 
> You should (eventually) have a device tree binding for the event channel
> and use a OF (device tree) device driver instead of this core_initcall()
> to register the handler etc.
 
Yes, that is the idea, once we have better device tree support in Xen.
We should also pass the IRQ number to be used as event injection
mechanism through the device tree.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/