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

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Message-ID: <20140210111710.GC17766@mudshark.cambridge.arm.com>
Date:	Mon, 10 Feb 2014 11:17:10 +0000
From:	Will Deacon <will.deacon@....com>
To:	Fabrice Gasnier <fabrice.gasnier@...com>
Cc:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
	Jonathan Austin <Jonathan.Austin@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"nico@...aro.org" <nico@...aro.org>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"ben.dooks@...ethink.co.uk" <ben.dooks@...ethink.co.uk>,
	"vgupta@...opsys.com" <vgupta@...opsys.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"maxime.coquelin@...com" <maxime.coquelin@...com>
Subject: Re: [RFC PATCH] ARM: Add imprecise abort enable/disable macro

On Mon, Feb 10, 2014 at 08:50:16AM +0000, Fabrice Gasnier wrote:
> On 02/07/2014 06:09 PM, Will Deacon wrote:
> > On Fri, Feb 07, 2014 at 04:19:15PM +0000, Fabrice GASNIER wrote:
> >> 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();
> > Surely we want to enable this as early as possible? Now, putting this into
> > head.S is ugly, as it duplicating it across all the proc*.S files, so why
> > not setup_arch?
> Sorry, I'm not sure to understand your last comment.
> At least, I need it enabled before probing drivers (PCIe bus)
> I've added imprecise abort enable code in traps.c, following Russel 
> King's advice, please see:
> http://archive.arm.linux.org.uk/lurker/message/20140131.170827.d752a1cc.en.html
> As abort bit is local to a cpu, i've also added it in smp.c, but this 
> may not be the right place ?
> 
> Please elaborate,

I was just suggesting that we move your local_abt_enable() call to
setup_arch, since that's called before early_trap_init on the primary CPU.

Will
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