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Re: [Xen-devel] [GSoC-2019] About the crossbar and xen
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Denis Obrezkov <denisobrezkov@xxxxxxxxx>
- Date: Wed, 10 Jul 2019 22:43:37 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Hunyue Yau <hy-gsoc@xxxxxxxxxxxxxxx>, Iain Hunter <drhunter95@xxxxxxxxx>
- Delivery-date: Wed, 10 Jul 2019 20:43:49 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
Hi,
On 7/10/19 10:17 PM, Stefano Stabellini wrote:
> On Wed, 10 Jul 2019, Denis Obrezkov wrote:
>> Hi,
>>
>> On 7/10/19 9:49 PM, Stefano Stabellini wrote:
>>
>>>
>>> phandle = <0x00000002>;
>>>
>>> I think that means that interrupts go to the GIC via Crossbar; i.e. the
>>> parent interrupt controller of Crossbar is the GIC.
>>>
>> But the crossbar's interrupt-parent node is 0x00000008 and phandle value
>> 0x00000008 belongs to
>> interrupt-controller@48281000 {
>> compatible = "ti,omap5-wugen-mpu", "ti,omap4-wugen-mpu";
>>
>> For me it looks like interrupts from crossbar goes to wugen and the from
>> wugen to GIC. But I don't quite understand it.
>
> Hi Denis,
>
> I only read your email and got a partial picture. I read the full device
> tree now and the hierarchy is as follow:
>
> - crossbar routes to phandle 8
> - phandle 8 is omap5-wugen-mpu and routes to phandle 2
> - phandle 2 is the GIC
>
> So:
>
> crossbar -> omap5-wugen-mpu -> GIC
>
I am interested whether we should do something with omap5-wugen-mpu. I
found that crossbar is connected to GIC. And on some schemes in trm it
is connected via omap5-wugen-mpu. So, it is not clear for me whether it
should be handled in xen.
--
Regards, Denis Obrezkov
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