linux-kernel - Re: [PATCH v2 19/36] irqchip/gic-v4.1: Add VPE INVALL callback

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Message-ID: <28e29c2d-a35a-6a67-c65d-7ab61d33b21b@huawei.com>
Date:   Fri, 1 Nov 2019 19:51:54 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>, <kvmarm@...ts.cs.columbia.edu>,
        <linux-kernel@...r.kernel.org>
CC:     Eric Auger <eric.auger@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Andrew Murray" <Andrew.Murray@....com>,
        Jayachandran C <jnair@...vell.com>,
        "Robert Richter" <rrichter@...vell.com>
Subject: Re: [PATCH v2 19/36] irqchip/gic-v4.1: Add VPE INVALL callback

Hi Marc,

On 2019/10/27 22:42, Marc Zyngier wrote:
> GICv4.1 redistributors have a VPE-aware INVALL register. Progress!
> We can now emulate a guest-requested INVALL without emiting a
> VINVALL command.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>

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

> ---
>   drivers/irqchip/irq-gic-v3-its.c   | 14 ++++++++++++++
>   include/linux/irqchip/arm-gic-v3.h |  3 +++
>   2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index f7effd453729..10bd156aa042 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -3511,6 +3511,19 @@ static void its_vpe_4_1_deschedule(struct its_vpe *vpe,
>   	}
>   }
>   
> +static void its_vpe_4_1_invall(struct its_vpe *vpe)
> +{
> +	void __iomem *rdbase;
> +	u64 val;
> +
> +	val  = GICR_INVLPIR_V;
> +	val |= FIELD_PREP(GICR_INVLPIR_VPEID, vpe->vpe_id);

Can we use GICR_INVALL_V/VPEID instead, and ...

> +
> +	/* Target the redistributor this vPE is currently known on */
> +	rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
> +	gic_write_lpir(val, rdbase + GICR_INVALLR);
> +}
> +
>   static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
>   {
>   	struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
> @@ -3526,6 +3539,7 @@ static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
>   		return 0;
>   
>   	case INVALL_VPE:
> +		its_vpe_4_1_invall(vpe);
>   		return 0;
>   
>   	default:
> diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
> index 6fd89d77b2b2..b69f60792554 100644
> --- a/include/linux/irqchip/arm-gic-v3.h
> +++ b/include/linux/irqchip/arm-gic-v3.h
> @@ -247,6 +247,9 @@
>   #define GICR_TYPER_COMMON_LPI_AFF	GENMASK_ULL(25, 24)
>   #define GICR_TYPER_AFFINITY		GENMASK_ULL(63, 32)
>   
> +#define GICR_INVLPIR_VPEID		GENMASK_ULL(47, 32)
> +#define GICR_INVLPIR_V			GENMASK_ULL(63, 63)
> +

... define them here:

#define GICR_INVALL_VPEID		GICR_INVLPIR_VPEID
#define GICR_INVALL_V			GICR_INVLPIR_V


Thanks,
Zenghui

>   #define GIC_V3_REDIST_SIZE		0x20000
>   
>   #define LPI_PROP_GROUP1			(1 << 1)
>