linux-kernel - Re: [PATCH 3/5] irqchip/bcm2836: Make IPIs use handle_percpu_devid

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Message-ID: <dff83a32c64bad6e3880dba8804cea6c@kernel.org>
Date:   Tue, 15 Dec 2020 15:46:55 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Andrew Lunn <andrew@...n.ch>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Scott Branden <sbranden@...adcom.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 3/5] irqchip/bcm2836: Make IPIs use
 handle_percpu_devid_irq()

On 2020-12-15 15:39, Guenter Roeck wrote:
> On 12/15/20 7:26 AM, Marc Zyngier wrote:
>> On 2020-12-15 15:21, Guenter Roeck wrote:
>>> Hi Marc,
>>> 
>>> On 12/15/20 2:19 AM, Marc Zyngier wrote:
>>>> Hi Gunter,
>>>> 
>>>> On 2020-12-15 00:21, Guenter Roeck wrote:
>>>>> On Mon, Nov 09, 2020 at 09:41:19AM +0000, Valentin Schneider wrote:
>>>>>> As done for the Arm GIC irqchips, move IPIs to 
>>>>>> handle_percpu_devid_irq() as
>>>>>> handle_percpu_devid_fasteoi_ipi() isn't actually required.
>>>>>> 
>>>>>> Signed-off-by: Valentin Schneider <valentin.schneider@....com>
>>>>> 
>>>>> This patch results in boot failures (silent stall) for the qemu
>>>>> raspi2 emulation. Unfortunately it can not be reverted because
>>>>> handle_percpu_devid_fasteoi_ipi no longer exists in next-20201214,
>>>>> so I don't know if it is the only problem.
>>>> 
>>>> This is odd. This works just fine for me on both the RPi2 and 3
>>>> emulation, running a full Debian userspace. Could this be caused
>>>> by the version of QEMU you are using? Here's what I have:
>>>> 
>>>> $ qemu-system-arm --version
>>>> QEMU emulator version 5.1.0 (Debian 1:5.1+dfsg-4+b1)
>>>> 
>>> 
>>> I used qemu 5.0 which - up to now - worked fine. Let me try with
>>> 5.1 and 5.2. Sorry, I should have tried first before bothering you.
>> 
>> No bother at all. If this works for you on more recent versions of
>> QEMU, that'd be an interesting data point. I'm also interested in
>> the result of the patch either way.
>> 
> 
> It doesn't work for me with qemu 5.1, nor with qemu 5.2. My userspace
> is generated with buildroot, busybox-based, and very basic.

OK, so something is definitely different between our setups.
Mind pointing me to your config and your QEMU invocation?

> 
> Your patch fixes the problem for me, though, so feel free to add
> 
> Tested-by: Guenter Roeck <linux@...ck-us.net>
> 
> if/when you submit it.

Thanks for that.

         M.
-- 
Jazz is not dead. It just smells funny...