linux-kernel - Re: [PATCH] Remove POWER10_CPU dependency and move PPC_MODULE_FEATURE

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Message-ID: <87wn2g9b9l.fsf@mpe.ellerman.id.au>
Date:   Thu, 13 Apr 2023 23:12:22 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Danny Tsen <dtsen@...ux.ibm.com>, linux-crypto@...r.kernel.org
Cc:     herbert@...dor.apana.org.au, leitao@...ian.org,
        nayna@...ux.ibm.com, appro@...ptogams.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        ltcgcw@...ux.vnet.ibm.com, dtsen@...ibm.com,
        Danny Tsen <dtsen@...ux.ibm.com>
Subject: Re: [PATCH] Remove POWER10_CPU dependency and move
 PPC_MODULE_FEATURE_P10.

Danny Tsen <dtsen@...ux.ibm.com> writes:
> Remove Power10 dependency in Kconfig and detect Power10 feature at runtime.
> Move PPC_MODULE_FEATURE_P10 definition to be in
> arch/powerpc/include/asm/cpufeature.h.

This should be two patches, one for the Kconfig change and one moving
the feature flag.

Also don't you need a cpu feature check in p10_init()? Otherwise the
driver can be loaded on non-P10 CPUs, either by being built-in, or
manually.

cheers

> Signed-off-by: Danny Tsen <dtsen@...ux.ibm.com>
> ---
>  arch/powerpc/crypto/Kconfig            | 2 +-
>  arch/powerpc/crypto/aes-gcm-p10-glue.c | 1 -
>  arch/powerpc/include/asm/cpufeature.h  | 1 +
>  3 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/crypto/Kconfig b/arch/powerpc/crypto/Kconfig
> index 1f8f02b494e1..7113f9355165 100644
> --- a/arch/powerpc/crypto/Kconfig
> +++ b/arch/powerpc/crypto/Kconfig
> @@ -96,7 +96,7 @@ config CRYPTO_AES_PPC_SPE
>  
>  config CRYPTO_AES_GCM_P10
>  	tristate "Stitched AES/GCM acceleration support on P10 or later CPU (PPC)"
> -	depends on PPC64 && POWER10_CPU && CPU_LITTLE_ENDIAN
> +	depends on PPC64 && CPU_LITTLE_ENDIAN
>  	select CRYPTO_LIB_AES
>  	select CRYPTO_ALGAPI
>  	select CRYPTO_AEAD
> diff --git a/arch/powerpc/crypto/aes-gcm-p10-glue.c b/arch/powerpc/crypto/aes-gcm-p10-glue.c
> index 1533c8cdd26f..bd3475f5348d 100644
> --- a/arch/powerpc/crypto/aes-gcm-p10-glue.c
> +++ b/arch/powerpc/crypto/aes-gcm-p10-glue.c
> @@ -22,7 +22,6 @@
>  #include <linux/module.h>
>  #include <linux/types.h>
>  
> -#define PPC_MODULE_FEATURE_P10	(32 + ilog2(PPC_FEATURE2_ARCH_3_1))
>  #define	PPC_ALIGN		16
>  #define GCM_IV_SIZE		12
>  
> diff --git a/arch/powerpc/include/asm/cpufeature.h b/arch/powerpc/include/asm/cpufeature.h
> index f6f790a90367..2dcc66225e7f 100644
> --- a/arch/powerpc/include/asm/cpufeature.h
> +++ b/arch/powerpc/include/asm/cpufeature.h
> @@ -22,6 +22,7 @@
>   */
>  
>  #define PPC_MODULE_FEATURE_VEC_CRYPTO			(32 + ilog2(PPC_FEATURE2_VEC_CRYPTO))
> +#define PPC_MODULE_FEATURE_P10				(32 + ilog2(PPC_FEATURE2_ARCH_3_1))
>  
>  #define cpu_feature(x)		(x)
>  
> -- 
> 2.31.1