linux-kernel - Re: [RFC PATCH 23/33] irqchip/gic-v3-its: Add VPENDBASER/VPROPBASER accessors

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Message-ID: <155b4430-60ba-66bd-3843-469bb2509ad5@redhat.com>
Date:   Thu, 16 Mar 2017 22:03:56 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <marc.zyngier@....com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [RFC PATCH 23/33] irqchip/gic-v3-its: Add VPENDBASER/VPROPBASER
 accessors

Hi,

On 17/01/2017 11:20, Marc Zyngier wrote:
> V{PEND,PROP}BASER being 64bit registers, they need some ad-hoc
> accessors on 32bit, specially given that VPENDBASER contains
> a Valid bit, making the access a bit convoluted.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Eric
> ---
>  arch/arm/include/asm/arch_gicv3.h   | 28 ++++++++++++++++++++++++++++
>  arch/arm64/include/asm/arch_gicv3.h |  5 +++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/arch/arm/include/asm/arch_gicv3.h b/arch/arm/include/asm/arch_gicv3.h
> index 2747590..3f18832 100644
> --- a/arch/arm/include/asm/arch_gicv3.h
> +++ b/arch/arm/include/asm/arch_gicv3.h
> @@ -291,5 +291,33 @@ static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
>   */
>  #define gits_write_cwriter(v, c)	__gic_writeq_nonatomic(v, c)
>  
> +/*
> + * GITS_VPROPBASER - hi and lo bits may be accessed independently.
> + */
> +#define gits_write_vpropbaser(v, c)	__gic_writeq_nonatomic(v, c)
> +
> +/*
> + * GITS_VPENDBASER - the Valid bit must be cleared before changing
> + * anything else.
> + */
> +static inline void gits_write_vpendbaser(u64 val, void * __iomem addr)
> +{
> +	u32 tmp;
> +
> +	tmp = readl_relaxed(addr + 4);
> +	if (tmp & GICR_PENDBASER_Valid) {
> +		tmp &= ~GICR_PENDBASER_Valid;
> +		writel_relaxed(tmp, addr + 4);
> +	}
> +
> +	/*
> +	 * Use the fact that __gic_writeq_nonatomic writes the second
> +	 * half of the 64bit quantity after the first.
> +	 */
> +	__gic_writeq_nonatomic(val, addr);
> +}
> +
> +#define gits_read_vpendbaser(c)		__gic_readq_nonatomic(c)
> +
>  #endif /* !__ASSEMBLY__ */
>  #endif /* !__ASM_ARCH_GICV3_H */
> diff --git a/arch/arm64/include/asm/arch_gicv3.h b/arch/arm64/include/asm/arch_gicv3.h
> index f37e3a2..9420b7a 100644
> --- a/arch/arm64/include/asm/arch_gicv3.h
> +++ b/arch/arm64/include/asm/arch_gicv3.h
> @@ -188,5 +188,10 @@ static inline void gic_write_bpr1(u32 val)
>  #define gicr_write_pendbaser(v, c)	writeq_relaxed(v, c)
>  #define gicr_read_pendbaser(c)		readq_relaxed(c)
>  
> +#define gits_write_vpropbaser(v, c)	writeq_relaxed(v, c)
> +
> +#define gits_write_vpendbaser(v, c)	writeq_relaxed(v, c)
> +#define gits_read_vpendbaser(c)		readq_relaxed(c)
> +
>  #endif /* __ASSEMBLY__ */
>  #endif /* __ASM_ARCH_GICV3_H */
>