linux-kernel - Re: [PATCH v6] arm64: Add support for new control bits CTR_EL0.DIC and CTR

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Date:   Wed, 7 Mar 2018 10:04:20 +0000
From:   Will Deacon <will.deacon@....com>
To:     Shanker Donthineni <shankerd@...eaurora.org>
Cc:     Philip Elcan <pelcan@...eaurora.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Robin Murphy <robin.murphy@....com>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6] arm64: Add support for new control bits CTR_EL0.DIC
 and CTR_EL0.IDC

On Tue, Mar 06, 2018 at 01:33:00PM -0600, Shanker Donthineni wrote:
> > I also confirmed with Thomas Speier, we can skip __flush_icache_all() if DIC=1.

Thanks,

> Planning to patch __flush_icache_all() itself instead of changing the callers. This
> way we can avoid "ic ialluis" completely. Is this okay for you? 
> 
> static inline void __flush_icache_all(void)
> {
>        /* Instruction cache invalidation is not required for I/D coherence? */
>       if (!cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) {
>                asm("ic ialluis");
>                dsb(ish);
>        }
> }

Yup, that's what I meant, cheers.

Will