linux-kernel - Re: [PATCH v4 06/20] irqchip/gic-v4.1: Add initial SGI configuration

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Date:   Thu, 20 Feb 2020 11:25:41 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>,
        "Robert Richter" <rrichter@...vell.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Eric Auger" <eric.auger@...hat.com>,
        James Morse <james.morse@....com>,
        "Julien Thierry" <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v4 06/20] irqchip/gic-v4.1: Add initial SGI configuration

Hi Marc,

On 2020/2/18 17:46, Marc Zyngier wrote:
> Hi Zenghui,
> 
> On 2020-02-18 07:25, Zenghui Yu wrote:
>> Hi Marc,
> 
> [...]
> 
>>>     static void its_sgi_irq_domain_deactivate(struct irq_domain *domain,
>>>                         struct irq_data *d)
>>>   {
>>> -    /* Nothing to do */
>>> +    struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
>>> +
>>> +    vpe->sgi_config[d->hwirq].enabled = false;
>>> +    its_configure_sgi(d, true);
>>
>> The spec says, when C==1, VSGI clears the pending state of the vSGI,
>> leaving the configuration unchanged.  So should we first clear the
>> pending state and then disable vSGI (let E==0)?
> 
> Right you are again. We need two commands, not just one (the pseudocode is
> pretty explicit).

With that change,

Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>


Thanks