linux-kernel - Re: [PATCH v2 2/5] arm64: Work around Falkor erratum 1003

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Message-ID: <20170103155502.GA14183@leverpostej>
Date:   Tue, 3 Jan 2017 15:55:02 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Christopher Covington <cov@...eaurora.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, shankerd@...eaurora.org,
        timur@...eaurora.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 2/5] arm64: Work around Falkor erratum 1003

Hi,

On Thu, Dec 29, 2016 at 05:43:32PM -0500, Christopher Covington wrote:
> +config QCOM_FALKOR_E1003_RESERVED_ASID
> +	int
> +	default 1
> +	depends on QCOM_FALKOR_ERRATUM_1003
> +

I don't think this needs to be configurable, so let's drop this into a
header, e.g. drop:

#define FALKOR_RESERVED_ASID	1

... in <asm/mmu_context.h>, protecting the rest with an ifndef
__ASSEMBLY__ guard.

[...]

> +#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
> +alternative_if ARM64_WORKAROUND_QCOM_FALKOR_E1003
> +	mrs     x2, ttbr0_el1                   // get cuurent TTBR0_EL1
> +	mov     x3, #CONFIG_QCOM_FALKOR_ERRATUM_1003	// reserved ASID

Wrong macro? That's not the ASID.

Thanks,
Mark.