linux-kernel - Re: [v2 PATCH] crypto: stm32 - Save and restore between each request

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Date:   Sun, 26 Feb 2023 00:15:27 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Lionel Debieve <lionel.debieve@...s.st.com>,
        Li kunyu <kunyu@...china.com>, davem@...emloft.net,
        linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com, mcoquelin.stm32@...il.com
Subject: Re: [v2 PATCH] crypto: stm32 - Save and restore between each request

On Sat, Feb 25, 2023 at 1:01 AM Linus Walleij <linus.walleij@...aro.org> wrote:

> I tested this on the Ux500 and sadly this happens
> already in probe():
(...)
> [    2.828815] stm32-hash a03c2000.hash: Algo 0 : 0 failed
> [    2.834144] stm32-hash: probe of a03c2000.hash failed with error -22

It turns out that this is because this:

-       /* Export Context */
-       u32                     *hw_context;
+       /* hash state */
+       u32                     hw_context[3 + HASH_CSR_REGISTER_NUMBER];

Makes struct stm32_hash_request_ctx 580 bytes
and that fails sanity check in ahash.c because
HASH_MAX_STATESIZE is 512.

I don't know the story behind why HASH_MAX_STATESIZE
is 512, the stm32 hash state contains a buffer of 256 bytes
so I guess either that buffer is a bit big or
HASH_MAX_STATESIZE is a bit small?

I'm happy to try to change either to make this fit.

Yours,
Linus Walleij