From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@citrix.com>
Subject: Re: [RFC PATCH v2 13/22] xen/arm: its: Add virtual ITS
 command support
Date: Thu, 30 Apr 2015 15:29:24 +0100
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To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Vijay Kilari <vijay.kilari@gmail.com>
Cc: Ian Campbell <ian.campbell@citrix.com>, Prasun Kapoor <Prasun.Kapoor@caviumnetworks.com>, Vijaya Kumar K <vijaya.kumar@caviumnetworks.com>, Julien Grall <julien.grall@linaro.org>, Tim Deegan <tim@xen.org>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Julien Grall <julien.grall@citrix.com>, Stefano Stabellini <stefano.stabellini@citrix.com>, manish.jaggi@caviumnetworks.com
List-Id: xen-devel@lists.xenproject.org

Hi,

On 30/04/15 14:47, Stefano Stabellini wrote:
>>>>
>>>> If the devid is not within this range, the ITS won't recognize the value and
>>>> won't be able to send the interrupt.
>>>>
>>>> So this is clearly not the right value.
>>>
>>> Sure, in that case the maximum value allowed by GITS_TYPER.Devbits.
>>> Vijay, what is the value of GITS_TYPER.Devbits on your platform?
>>
>> It is 21 bits
> 
> I would imagine that 21 bits would be plenty to find an unused devid.
>
> Alternatively we could use an inexistent function of a real device, such
> as 00:00.1 (function 1 of the host bridge).

As discussed IRL, this idea sounds good to me.

Although I would be happy with any other way which ensure the devid is free.

Regards,

-- 
Julien Grall