linux-kernel - Re: [PATCH v5 12/23] irqchip/gic-v4.1: Plumb set_vcpu

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Message-ID: <2f981328-92e8-7554-ccf7-962c79add0c3@redhat.com>
Date:   Tue, 17 Mar 2020 11:35:11 +0100
From:   Auger Eric <eric.auger@...hat.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>,
        Zenghui Yu <yuzenghui@...wei.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v5 12/23] irqchip/gic-v4.1: Plumb set_vcpu_affinity SGI
 callbacks

Hi Marc,

On 3/4/20 9:33 PM, Marc Zyngier wrote:
> Just like for vLPIs, there is some configuration information that cannot
> be directly communicated through the normal irqchip API, and we have to
> use our good old friend set_vcpu_affinity as a side-band communication
> mechanism.
> 
> 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 fb2b836c31ff..effb0e0b0c9d 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4033,6 +4033,23 @@ 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:
PROP_UPDATE_VSGI directly?
> +		vpe->sgi_config[d->hwirq].priority = info->priority;
> +		vpe->sgi_config[d->hwirq].group = info->group;
> +		its_configure_sgi(d, false);
> +		return 0;
> +
extra line
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
>  static struct irq_chip its_sgi_irq_chip = {
>  	.name			= "GICv4.1-sgi",
>  	.irq_mask		= its_sgi_mask_irq,
> @@ -4040,6 +4057,7 @@ 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 44e8c19e3d56..b4dbf899460b 100644
> --- a/include/linux/irqchip/arm-gic-v4.h
> +++ b/include/linux/irqchip/arm-gic-v4.h
> @@ -103,6 +103,7 @@ enum its_vcpu_info_cmd_type {
>  	SCHEDULE_VPE,
>  	DESCHEDULE_VPE,
>  	INVALL_VPE,
> +	PROP_UPDATE_SGI,
>  };
>  
>  struct its_cmd_info {
> @@ -115,6 +116,10 @@ struct its_cmd_info {
>  			bool		g0en;
>  			bool		g1en;
>  		};
> +		struct {
> +			u8		priority;
> +			bool		group;
> +		};
>  	};
>  };
>  
> 
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Eric