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

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Message-ID: <54318b15-cfa4-1460-1e8b-049da2ab2bda@samsung.com>
Date:   Thu, 17 Sep 2020 11:13:37 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Jon Hunter <jonathanh@...dia.com>, Marc Zyngier <maz@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        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

Hi Jon,

On 17.09.2020 11:09, Jon Hunter wrote:
> On 17/09/2020 09:54, Marek Szyprowski wrote:
>> On 17.09.2020 10:49, Jon Hunter wrote:
>>> 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:
>>>>>> 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.
>> next-20200916 completely broken on ARM and ARM64. Please check
>> next-20200915 + the mentioned fix or just check
>> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=irq/ipi-as-irq
> Ah thanks! Any idea what is causing the other failure on next-20200916?
>
> Yes we have noticed that now everything fails next-20200916 so not just
> this issue.

The issue is caused by commit c999bd436fe9 ("mm/cma: make number of CMA 
areas dynamic, remove CONFIG_CMA_AREAS")

https://lore.kernel.org/linux-arm-kernel/20200915205703.34572-1-mike.kravetz@oracle.com/

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland