linux-kernel - Re: [PATCH v6 10/23] drivers: crypto: meson: avoid kzalloc in engine thread

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Date: Fri, 5 Apr 2024 14:55:48 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Alexey Romanov <avromanov@...utedevices.com>
Cc: neil.armstrong@...aro.org, clabbe@...libre.com, davem@...emloft.net,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, khilman@...libre.com, jbrunet@...libre.com,
	martin.blumenstingl@...glemail.com, vadim.fedorenko@...ux.dev,
	linux-crypto@...r.kernel.org, linux-amlogic@...ts.infradead.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...utedevices.com
Subject: Re: [PATCH v6 10/23] drivers: crypto: meson: avoid kzalloc in engine
 thread

On Tue, Mar 26, 2024 at 06:32:06PM +0300, Alexey Romanov wrote:
>
>  /*
>   * struct meson_cipher_tfm_ctx - context for a skcipher TFM
> - * @key:		pointer to key data
> + * @keyiv:		key data
>   * @keylen:		len of the key
>   * @keymode:		The keymode(type and size of key) associated with this TFM
>   * @mc:			pointer to the private data of driver handling this TFM
>   * @fallback_tfm:	pointer to the fallback TFM
>   */
>  struct meson_cipher_tfm_ctx {
> -	u32 *key;
> -	u32 keylen;
> +	u8 keyiv[AES_MAX_KEY_SIZE + AES_BLOCK_SIZE] ____cacheline_aligned;
> +	u32 keylen ____cacheline_aligned;

This doesn't do anything to guarantee that tfm_ctx is aligned.

You either need to align this by hand, or you could use the
crypto_skcipher_ctx_dma helper if DMA alignment is what you're
actually looking for.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt