linux-kernel - Re: [PATCH v2 04/12] irqchip/gic-v3: Add ESPI range support

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Date:   Mon, 19 Aug 2019 22:25:33 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lokesh Vutla <lokeshvutla@...com>,
        John Garry <john.garry@...wei.com>,
        <linux-kernel@...r.kernel.org>,
        "Shameerali Kolothum Thodi" <shameerali.kolothum.thodi@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 04/12] irqchip/gic-v3: Add ESPI range support

Hi Marc,

On 2019/8/6 18:01, Marc Zyngier wrote:
> Add the required support for the ESPI range, which behave exactly like
> the SPIs of old, only with new funky INTIDs.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>   drivers/irqchip/irq-gic-v3.c       | 85 ++++++++++++++++++++++++------
>   include/linux/irqchip/arm-gic-v3.h | 17 +++++-
>   2 files changed, 85 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index db3bdedd7241..1ca4dde32034 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -51,13 +51,16 @@ struct gic_chip_data {
>   	u32			nr_redist_regions;
>   	u64			flags;
>   	bool			has_rss;
> -	unsigned int		irq_nr;
>   	struct partition_desc	*ppi_descs[16];
>   };
>   
>   static struct gic_chip_data gic_data __read_mostly;
>   static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
>   
> +#define GIC_ID_NR	(1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
> +#define GIC_LINE_NR	GICD_TYPER_SPIS(gic_data.rdists.gicd_typer)

This indicates the maximum SPI INTID that the GIC implementation
supports, should we restrict it to no more than 1020?

ITLinesNumber can be '11111', and I saw the following info on my host:
     "GICv3: 992 SPIs implemented"


Thanks,
zenghui