Messages in this thread | | | From | JiaJie Ho <> | Subject | RE: [PATCH v2 4/4] crypto: starfive - Add hash and HMAC support | Date | Tue, 14 Feb 2023 07:11:02 +0000 |
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> -----Original Message----- > From: Christoph Hellwig <hch@infradead.org> > Sent: 14 February, 2023 2:13 PM > To: Herbert Xu <herbert@gondor.apana.org.au> > Cc: JiaJie Ho <jiajie.ho@starfivetech.com>; David S . Miller > <davem@davemloft.net>; Rob Herring <robh+dt@kernel.org>; Krzysztof > Kozlowski <krzysztof.kozlowski+dt@linaro.org>; Emil Renner Berthing > <kernel@esmil.dk>; Conor Dooley <conor.dooley@microchip.com>; linux- > crypto@vger.kernel.org; devicetree@vger.kernel.org; linux- > kernel@vger.kernel.org; linux-riscv@lists.infradead.org > Subject: Re: [PATCH v2 4/4] crypto: starfive - Add hash and HMAC support > > On Thu, Feb 09, 2023 at 05:43:34PM +0800, Herbert Xu wrote: > > On Thu, Feb 09, 2023 at 09:33:06AM +0000, JiaJie Ho wrote: > > > > > > 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. > > > > Does your hardware support scatter-and-gather? If so you should at > > least allocate individual pages rather than one contiguous buffer. > > > > Then you can allocate them on-demand rather than before-hand. > > > > It would also be nice to not do the copy if the input you were given > > was in low memory (and contiguous if your hardware doesn't do SG). > > All of that is done by the DMA API, or more specifically swiotlb and does not > need to be duplicated in individual drivers.
I'll update the driver accordingly. Thanks Christoph and Herbert for the pointers.
Regards Jia Jie
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