linux-kernel - Re: [PATCH 1/3] powerpc/powernv: Move CHECK_HMI

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Date:	Thu, 17 Mar 2016 16:21:40 +1100
From:	Paul Mackerras <paulus@...abs.org>
To:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>
Cc:	mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	mahesh@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH 1/3] powerpc/powernv: Move CHECK_HMI_INTERRUPT to
 exception-64s header

On Mon, Feb 29, 2016 at 05:52:58PM +0530, Shreyas B. Prabhu wrote:
> CHECK_HMI_INTERRUPT is used to check for HMI's in reset vector. Move
> the macro to a common location (exception-64s.h)
> This patch does not change any functionality.

Comments below...

> diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
> index 93ae809fe5ea..0082290314eb 100644
> --- a/arch/powerpc/include/asm/exception-64s.h
> +++ b/arch/powerpc/include/asm/exception-64s.h
> @@ -254,6 +254,25 @@ do_kvm_##n:								\
>  #define KVM_HANDLER_SKIP(area, h, n)
>  #endif
>  
> +#define CHECK_HMI_INTERRUPT						\
> +	mfspr	r0,SPRN_SRR1;						\
> +BEGIN_FTR_SECTION_NESTED(66);						\
> +	rlwinm	r0,r0,45-31,0xf;  /* extract wake reason field (P8) */	\
> +FTR_SECTION_ELSE_NESTED(66);						\
> +	rlwinm	r0,r0,45-31,0xe;  /* P7 wake reason field is 3 bits */	\
> +ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66);		\
> +	cmpwi	r0,0xa;			/* Hypervisor maintenance ? */	\
> +	bne	20f;							\
> +	/* Invoke opal call to handle hmi */				\
> +	ld	r2,PACATOC(r13);					\
> +	ld	r1,PACAR1(r13);						\
> +	std	r3,ORIG_GPR3(r1);	/* Save original r3 */		\
> +	li	r0,OPAL_HANDLE_HMI;	/* Pass opal token argument*/	\
> +	bl	opal_call_realmode;					\
> +	ld	r3,ORIG_GPR3(r1);	/* Restore original r3 */	\
> +20:	nop;
> +
> +
>  #define NOTEST(n)

I'd rather keep NOTEST together with the definitions of KVMTEST etc.
I suggest you add this block at the end of exceptions-64s.h (just
before the final #endif).

Paul.