linux-kernel - Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard interrupts

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Message-ID: <e317b2fe-52e3-8ce7-ba77-43d2708d660f@nvidia.com>
Date:   Thu, 17 Sep 2020 09:49:06 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Sumit Garg <sumit.garg@...aro.org>,
        <kernel-team@...roid.com>, Florian Fainelli <f.fainelli@...il.com>,
        "Russell King" <linux@....linux.org.uk>,
        Jason Cooper <jason@...edaemon.net>,
        "Saravana Kannan" <saravanak@...gle.com>,
        Andrew Lunn <andrew@...n.ch>,
        Catalin Marinas <catalin.marinas@....com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        "Valentin Schneider" <Valentin.Schneider@....com>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard
 interrupts


On 17/09/2020 09:45, Marc Zyngier wrote:
> On 2020-09-17 08:54, Jon Hunter wrote:
>> On 17/09/2020 08:50, Marc Zyngier wrote:
>>> Hi Linus,
>>>
>>> On 2020-09-17 08:40, Linus Walleij wrote:
>>>> On Wed, Sep 16, 2020 at 5:11 PM Marc Zyngier <maz@...nel.org> wrote:
>>>>
>>>>> Can you try the patch below and let me know?
>>>>
>>>> I tried this patch and now Ux500 WORKS. So this patch is definitely
>>>> something you should apply.
>>>>
>>>>> -                       if (is_frankengic())
>>>>> -                               set_sgi_intid(irqstat);
>>>>> +                       this_cpu_write(sgi_intid, intid);
>>>>
>>>> This needs changing to irqstat to compile as pointed out by Jon.
>>>>
>>>> With that:
>>>> Tested-by: Linus Walleij <linus.walleij@...aro.org>
>>>
>>> Thanks a lot for that.
>>>
>>> Still need to understand why some of Jon's systems are left unbootable,
>>> despite having similar GIC implementations (Tegra194 and Tegra210 use
>>> the same GIC-400, and yet only one of the two boots correctly...).
>>
>> So far, I have only tested this patch on Tegra20. Let me try the other
>> failing boards this morning and see if those still fail.
> 
> Tegra20 (if I remember well) is a dual A9 with the same GIC implementation
> as Ux500, hence requiring the source CPU bits to be written back. So this
> patch should have cured it, but didn't...
> 
> /me puzzled.

Me too. Maybe there just happens to be something else also going wrong
in next. I am doing a bit more testing to see if applying the fix
directly on top of this change fixes it to try and eliminate anything
else in -next.

Linus, what -next are you testing on? I am using next-20200916.

Jon

-- 
nvpublic