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From:   Heiko =?ISO-8859-1?Q?St=FCbner?= <heiko@sntech.de>
To:     palmer@dabbelt.com, paul.walmsley@sifive.com
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        wefu@redhat.com, guoren@kernel.org, cmuellner@linux.com,
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        atishp@atishpatra.org, anup@brainfault.org, mick@ics.forth.gr,
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        drew@beagleboard.org, rdunlap@infradead.org,
        Atish Patra <atish.patra@wdc.com>
Subject: Re: [PATCH v7 3/4] riscv: Add support for non-coherent devices using zicbom extension
Date:   Thu, 07 Jul 2022 10:40:57 +0200
Message-ID: <1729939.VLH7GnMWUR@diego>
In-Reply-To: <20220706231536.2041855-4-heiko@sntech.de>
References: <20220706231536.2041855-1-heiko@sntech.de> <20220706231536.2041855-4-heiko@sntech.de>
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Am Donnerstag, 7. Juli 2022, 01:15:35 CEST schrieb Heiko Stuebner:
> The Zicbom ISA-extension was ratified in november 2021
> and introduces instructions for dcache invalidate, clean
> and flush operations.
> 
> Implement cache management operations for non-coherent devices
> based on them.
> 
> Of course not all cores will support this, so implement an
> alternative-based mechanism that replaces empty instructions
> with ones done around Zicbom instructions.
> 
> As discussed in previous versions, assume the platform
> being coherent by default so that non-coherent devices need
> to get marked accordingly by firmware.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Atish Patra <atish.patra@wdc.com>
> Cc: Guo Ren <guoren@kernel.org>
> Cc: Anup Patel <anup@brainfault.org>

Over in v6 Guo provided [0] a

Reviewed-by: Guo Ren <guoren@kernel.org>


[0] https://lore.kernel.org/r/CAJF2gTRN1J3edjbt5L9ELLtMzXKWUABQb=QxDA90uY7mj=O0rw@mail.gmail.com