linux-kernel - Re: [PATCH v2 4/4] crypto: starfive

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Date:   Mon, 13 Feb 2023 22:12:08 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     JiaJie Ho <jiajie.ho@...rfivetech.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Conor Dooley <conor.dooley@...rochip.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v2 4/4] crypto: starfive - Add hash and HMAC support

On Thu, Feb 09, 2023 at 09:33:06AM +0000, JiaJie Ho wrote:
> > Why do you copy everything before you feed it to the hardware?
> > If the issue is alignment then surely you should only to copy a small amount
> > of header (and perhaps trailer) for that?
> > 
> 
> The DMA can only support 32-bit addressing.
> So, I am copying everything in case kernel allocated memory region >32-bit for a user app.

The DMA API takes care of that.