linux-kernel - Re: [PATCH v5 2/2] arm64: Work around Falkor erratum 1009

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Date:   Tue, 31 Jan 2017 11:17:03 -0500
From:   Christopher Covington <cov@...eaurora.org>
To:     Will Deacon <will.deacon@....com>
Cc:     Jonathan Corbet <corbet@....net>,
        Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, shankerd@...eaurora.org,
        timur@...eaurora.org, Mark Langsdorf <mlangsdo@...hat.com>,
        Mark Salter <msalter@...hat.com>, Jon Masters <jcm@...hat.com>,
        Neil Leeder <nleeder@...eaurora.org>
Subject: Re: [PATCH v5 2/2] arm64: Work around Falkor erratum 1009

On 01/31/2017 09:38 AM, Will Deacon wrote:
> On Mon, Jan 30, 2017 at 06:08:17PM -0500, Christopher Covington wrote:
>> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
>> index deab52374119..fc434f421c7b 100644
>> --- a/arch/arm64/include/asm/tlbflush.h
>> +++ b/arch/arm64/include/asm/tlbflush.h
>> @@ -36,9 +36,21 @@
>>   * not. The macros handles invoking the asm with or without the
>>   * register argument as appropriate.
>>   */
>> -#define __TLBI_0(op, arg)		asm ("tlbi " #op)
>> -#define __TLBI_1(op, arg)		asm ("tlbi " #op ", %0" : : "r" (arg))
>> -#define __TLBI_N(op, arg, n, ...)	__TLBI_##n(op, arg)
>> +#define __TLBI_0(op, arg) asm volatile ("tlbi " #op "\n"		       \
>> +			    ALTERNATIVE("nop\n		nop",		       \
>> +					"dsb ish\n	tlbi " #op,	       \
>> +					ARM64_WORKAROUND_REPEAT_TLBI,	       \
>> +					CONFIG_QCOM_FALKOR_ERRATUM_1009)       \
>> +			    : : )
>> +
>> +#define __TLBI_1(op, arg) asm volatile ("tlbi " #op ", %0\n"		       \
>> +			    ALTERNATIVE("nop\n		nop",		       \
>> +					"dsb ish\n	tlbi " #op ", %0",     \
>> +					ARM64_WORKAROUND_REPEAT_TLBI,	       \
>> +					CONFIG_QCOM_FALKOR_ERRATUM_1009)       \
>> +			    : : "r" (arg))
>> +
> 
> Why are these now volatile? I asked the same question on the previous
> version but didn't get a response:
> 
> http://lists.infradead.org/pipermail/linux-arm-kernel/2017-January/483579.html

D'oh! Will fix in v6. Sorry about that.

Cov

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