Re: [Xen-devel] [PATCH] xen: arm: increase priority of SGIs used as IPIs

[Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>]

Hello, all.

I tested this patch (with debug patch) when I was looking for solution
to fix "simultaneous cross-interrupts" (see 1.1):
http://lists.xenproject.org/archives/html/xen-devel/2014-01/msg02685.html
This patch didn't fix my issue.
When the solution was founded I forgot about this patch)

Now I am using next solution:
http://marc.info/?l=xen-devel&m=139153089412362&w=2

But anyway, your patch works and looks good and I don't mind it.
Thank you.

Oleksandr Tyshchenko | Embedded Developer
GlobalLogic
www.globallogic.com

On Thu, Mar 13, 2014 at 2:56 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> On 03/13/2014 12:45 PM, Ian Campbell wrote:
>> On Thu, 2014-03-13 at 12:33 +0000, Julien Grall wrote:
>>> Hi Ian,
>>>
>>> On 01/28/2014 04:51 PM, Ian Campbell wrote:
>>>>      /* Set PPI and SGI priorities */
>>>> -    for (i = 0; i < 32; i += 4)
>>>> -        GICD[GICD_IPRIORITYR + i / 4] = 0xa0a0a0a0;
>>>> +    for (i = 0; i < 16; i += 4)
>>>> +        GICD[GICD_IPRIORITYR + i / 4] =
>>>> +            GIC_PRI_IPI<<24 | GIC_PRI_IPI<<16 | GIC_PRI_IPI<<8 | 
>>>> GIC_PRI_IPI;
>>>> +    for (i = 16; i < 32; i += 4)
>>>> +        GICD[GICD_IPRIORITYR + i / 4] =
>>>> +            GIC_PRI_IRQ<<24 | GIC_PRI_IRQ<<16 | GIC_PRI_IRQ<<8 | 
>>>> GIC_PRI_IRQ;
>>>
>>> I'm wondering if it's necessary to set the priority for PPIs. It will be
>>> overridden later when the interrupt will be setup. Until that time, the
>>> interrupt is not enabled.
>>
>> Strictly speaking probably not, but there isn't much harm in setting a
>> sane default I suppose.
>
> Right, I didn't see that we also do that for SPIs.
>
> I have a minor change to request, can you divide the comment "Set PPI
> and SGI priorities" in 2 to reflect was does each loop?
>
> Except that:
>
> Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
>
> Regards,
>
> --
> Julien Grall



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