linux-kernel - Re: [PATCH v7 3/4] riscv: Add support for non-coherent devices using zicbom extension

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Date:   Thu, 07 Jul 2022 10:40:57 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     palmer@...belt.com, paul.walmsley@...ive.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wefu@...hat.com, guoren@...nel.org, cmuellner@...ux.com,
        philipp.tomsich@...ll.eu, hch@....de, samuel@...lland.org,
        atishp@...shpatra.org, anup@...infault.org, mick@....forth.gr,
        robh+dt@...nel.org, krzk+dt@...nel.org, devicetree@...r.kernel.org,
        drew@...gleboard.org, rdunlap@...radead.org,
        Atish Patra <atish.patra@....com>
Subject: Re: [PATCH v7 3/4] riscv: Add support for non-coherent devices using zicbom extension

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@....de>
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Atish Patra <atish.patra@....com>
> Cc: Guo Ren <guoren@...nel.org>
> Cc: Anup Patel <anup@...infault.org>

Over in v6 Guo provided [0] a

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



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