linux-kernel - Re: [PATCH v2] ARM: Add imprecise abort enable/disable macro

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Message-ID: <1416245856.2734.4.camel@pengutronix.de>
Date:	Mon, 17 Nov 2014 18:37:36 +0100
From:	Lucas Stach <l.stach@...gutronix.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Fabrice GASNIER <fabrice.gasnier@...com>,
	u.kleine-koenig@...gutronix.de, jonathan.austin@....com,
	catalin.marinas@....com, will.deacon@....com, nico@...aro.org,
	sboyd@...eaurora.org, marc.zyngier@....com,
	ben.dooks@...ethink.co.uk, vgupta@...opsys.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	maxime.coquelin@...com
Subject: Re: [PATCH v2] ARM: Add imprecise abort enable/disable macro

Russell,

can you please revisit this patch? It got stuck in February after you
questioned if it works on anything but ARMv7M. Fabrice responded with an
E-Mail that showed that the logic in this patch is supposedly right and
it should work.

Do you still see anything wrong with this patch? It is a prerequisite
for proper PCI abort handling on a number of SoCs and I would like to
see this moving forward.

Thanks,
Lucas

Am Montag, den 10.02.2014, 17:45 +0100 schrieb Fabrice GASNIER:
> This patch adds imprecise abort enable/disable macros.
> It also enables imprecise aborts when starting kernel.
> 
> Changes in v2:
> Only ARMv6 and later have CPSR.A bit. On earlier CPUs,
> and ARMv7M this should be a no-op.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
> ---
>  arch/arm/include/asm/irqflags.h |   10 ++++++++++
>  arch/arm/kernel/smp.c           |    1 +
>  arch/arm/kernel/traps.c         |    4 ++++
>  3 files changed, 15 insertions(+)
> 
> diff --git a/arch/arm/include/asm/irqflags.h b/arch/arm/include/asm/irqflags.h
> index 3b763d6..8301f87 100644
> --- a/arch/arm/include/asm/irqflags.h
> +++ b/arch/arm/include/asm/irqflags.h
> @@ -51,6 +51,14 @@ static inline void arch_local_irq_disable(void)
>  
>  #define local_fiq_enable()  __asm__("cpsie f	@ __stf" : : : "memory", "cc")
>  #define local_fiq_disable() __asm__("cpsid f	@ __clf" : : : "memory", "cc")
> +
> +#ifndef CONFIG_CPU_V7M
> +#define local_abt_enable()  __asm__("cpsie a	@ __sta" : : : "memory", "cc")
> +#define local_abt_disable() __asm__("cpsid a	@ __cla" : : : "memory", "cc")
> +#else
> +#define local_abt_enable()	do { } while (0)
> +#define local_abt_disable()	do { } while (0)
> +#endif
>  #else
>  
>  /*
> @@ -130,6 +138,8 @@ static inline void arch_local_irq_disable(void)
>  	: "memory", "cc");					\
>  	})
>  
> +#define local_abt_enable()	do { } while (0)
> +#define local_abt_disable()	do { } while (0)
>  #endif
>  
>  /*
> diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
> index dc894ab..c2093cb 100644
> --- a/arch/arm/kernel/smp.c
> +++ b/arch/arm/kernel/smp.c
> @@ -377,6 +377,7 @@ asmlinkage void secondary_start_kernel(void)
>  
>  	local_irq_enable();
>  	local_fiq_enable();
> +	local_abt_enable();
>  
>  	/*
>  	 * OK, it's off to the idle thread for us
> diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
> index 4636d56..ef15709 100644
> --- a/arch/arm/kernel/traps.c
> +++ b/arch/arm/kernel/traps.c
> @@ -900,6 +900,10 @@ void __init early_trap_init(void *vectors_base)
>  
>  	flush_icache_range(vectors, vectors + PAGE_SIZE * 2);
>  	modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
> +
> +	/* Enable imprecise aborts */
> +	local_abt_enable();
> +
>  #else /* ifndef CONFIG_CPU_V7M */
>  	/*
>  	 * on V7-M there is no need to copy the vector table to a dedicated

-- 
Pengutronix e.K.             | Lucas Stach                 |
Industrial Linux Solutions   | http://www.pengutronix.de/  |

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