Re: [v2 PATCH 2/9] crypto: api - Add crypto_tfm_ctx_dma

[Herbert Xu]

On Fri, Nov 25, 2022 at 11:31:56AM +0000, Catalin Marinas wrote:
> 
> Is the CRYPTO_DMA_PADDING used anywhere? I couldn't find it in this
> series and I'd rather drop it, together with CRYPTO_DMA_ALIGN (see
> below).

Yes it's used by caam which needs it in a struct initialiser.

> We have a generic dma_get_cache_alignment() function which currently is
> either 1 or ARCH_DMA_MINALIGN, if the latter is defined. My plan is to
> make eventually make this dynamic based on the actual cache line size
> (on most arm64 systems it would be 64 rather than 128). So could you use
> this instead of defining a CRYPTO_DMA_ALIGN? The only difference would
> be that dma_get_cache_alignment() returns 1 rather than
> ARCH_KMALLOC_MINALIGN if ARCH_DMA_MINALIGN is not defined, but I don't
> think that's an issue.

I'm trying to make the driver patches as robotic as possible.

We could always improve upon this with driver-specific patches
to change the struct initialiser to a run-time assignment to
improve things further.

Thanks,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
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