linux-kernel - Re: [PATCH v4 09/20] irqchip/gic-v4.1: Plumb set_vcpu

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Date:   Thu, 20 Feb 2020 11:37:00 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     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 09/20] irqchip/gic-v4.1: Plumb set_vcpu_affinity SGI
 callbacks

Hi Marc,

On 2020/2/14 22:57, Marc Zyngier wrote:
> As for VLPIs, there is a number of configuration bits that cannot

As for vSGIs,

> be directly communicated through the normal irqchip API, and we
> have to use our good old friend set_vcpu_affinity.
> 
> This is used to configure group and priority for a given vSGI.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>

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

> ---
>   drivers/irqchip/irq-gic-v3-its.c   | 18 ++++++++++++++++++
>   include/linux/irqchip/arm-gic-v4.h |  5 +++++
>   2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index a9753435c4ff..a2e824eae43f 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -3969,6 +3969,23 @@ static int its_sgi_get_irqchip_state(struct irq_data *d,
>   	return 0;
>   }
>   
> +static int its_sgi_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
> +{
> +	struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
> +	struct its_cmd_info *info = vcpu_info;
> +
> +	switch (info->cmd_type) {
> +	case PROP_UPDATE_SGI:
> +		vpe->sgi_config[d->hwirq].priority = info->priority;
> +		vpe->sgi_config[d->hwirq].group = info->group;
> +		its_configure_sgi(d, false);
> +		return 0;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
>   static struct irq_chip its_sgi_irq_chip = {
>   	.name			= "GICv4.1-sgi",
>   	.irq_mask		= its_sgi_mask_irq,
> @@ -3976,6 +3993,7 @@ static struct irq_chip its_sgi_irq_chip = {
>   	.irq_set_affinity	= its_sgi_set_affinity,
>   	.irq_set_irqchip_state	= its_sgi_set_irqchip_state,
>   	.irq_get_irqchip_state	= its_sgi_get_irqchip_state,
> +	.irq_set_vcpu_affinity	= its_sgi_set_vcpu_affinity,
>   };
>   
>   static int its_sgi_irq_domain_alloc(struct irq_domain *domain,
> diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h
> index 30b4855bf766..a1a9d40266f5 100644
> --- a/include/linux/irqchip/arm-gic-v4.h
> +++ b/include/linux/irqchip/arm-gic-v4.h
> @@ -98,6 +98,7 @@ enum its_vcpu_info_cmd_type {
>   	SCHEDULE_VPE,
>   	DESCHEDULE_VPE,
>   	INVALL_VPE,
> +	PROP_UPDATE_SGI,

Maybe better to use 'PROP_UPDATE_VSGI'?


Thanks,
Zenghui

>   };
>   
>   struct its_cmd_info {
> @@ -110,6 +111,10 @@ struct its_cmd_info {
>   			bool		g0en;
>   			bool		g1en;
>   		};
> +		struct {
> +			u8		priority;
> +			bool		group;
> +		};
>   	};
>   };
>   
>