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

From: Jon Hunter <jonathanh@nvidia.com>
To: Marek Szyprowski <m.szyprowski@samsung.com>,
	Marc Zyngier <maz@kernel.org>
Cc: Sumit Garg <sumit.garg@linaro.org>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Russell King <linux@arm.linux.org.uk>,
	Jason Cooper <jason@lakedaemon.net>,
	Saravana Kannan <saravanak@google.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	linux-kernel@vger.kernel.org,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Valentin Schneider <Valentin.Schneider@arm.com>,
	Will Deacon <will@kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@vger.kernel.org>,
	linux-tegra <linux-tegra@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	kernel-team@android.com,
	Gregory Clement <gregory.clement@bootlin.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard interrupts
Date: Thu, 17 Sep 2020 15:53:07 +0100	[thread overview]
Message-ID: <ace68d00-f005-fee3-1f01-44522c180462@nvidia.com> (raw)
In-Reply-To: <4645f636-e7cc-6983-a3b7-897c20ec5096@samsung.com>

On 17/09/2020 09:54, Marek Szyprowski wrote:
> Hi Jon,
> 
> 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@kernel.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@linaro.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

OK, I have confirmed that on Tegra20 and Tegra30, that next-20200915 +
Marc's fix boots fine.

Tegra186 and Tegra194 are not booting, but I am wondering if this is yet
another issue that is not related. I have not actually bisected on these
boards, but I am now bisecting on Tegra186 to confirm.

Jon

-- 
nvpublic

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