linux-kernel - Re: [PATCH 1/6] x86: Add support for the pcommit instruction

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Date:	Wed, 12 Nov 2014 19:25:37 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-kernel@...r.kernel.org
CC:	H Peter Anvin <h.peter.anvin@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, x86@...nel.org
Subject: Re: [PATCH 1/6] x86: Add support for the pcommit instruction

On 11/11/2014 10:43 AM, Ross Zwisler wrote:
> Add support for the new pcommit instruction.  This instruction was
> announced in the document "Intel Architecture Instruction Set Extensions
> Programming Reference" with reference number 319433-022.
> 
> https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf
> 
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Cc: H Peter Anvin <h.peter.anvin@...el.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: x86@...nel.org
> ---
>  arch/x86/include/asm/cpufeature.h    | 1 +
>  arch/x86/include/asm/special_insns.h | 6 ++++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
> index 0bb1335..b3e6b89 100644
> --- a/arch/x86/include/asm/cpufeature.h
> +++ b/arch/x86/include/asm/cpufeature.h
> @@ -225,6 +225,7 @@
>  #define X86_FEATURE_RDSEED	( 9*32+18) /* The RDSEED instruction */
>  #define X86_FEATURE_ADX		( 9*32+19) /* The ADCX and ADOX instructions */
>  #define X86_FEATURE_SMAP	( 9*32+20) /* Supervisor Mode Access Prevention */
> +#define X86_FEATURE_PCOMMIT	( 9*32+22) /* PCOMMIT instruction */
>  #define X86_FEATURE_CLFLUSHOPT	( 9*32+23) /* CLFLUSHOPT instruction */
>  #define X86_FEATURE_AVX512PF	( 9*32+26) /* AVX-512 Prefetch */
>  #define X86_FEATURE_AVX512ER	( 9*32+27) /* AVX-512 Exponential and Reciprocal */
> diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
> index e820c08..1709a2e 100644
> --- a/arch/x86/include/asm/special_insns.h
> +++ b/arch/x86/include/asm/special_insns.h
> @@ -199,6 +199,12 @@ static inline void clflushopt(volatile void *__p)
>  		       "+m" (*(volatile char __force *)__p));
>  }
>  
> +static inline void pcommit(void)
> +{
> +	alternative(ASM_NOP4, ".byte 0x66, 0x0f, 0xae, 0xf8",
> +		    X86_FEATURE_PCOMMIT);
> +}
> +

Should this patch add the feature bit and cpuinfo entry to go with it?

--Andy
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