linux-kernel - Re: [PATCH 3/8] powerpc: add hvcalls for 24x7 and gpci (get performance counter info)

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Message-Id: <20140201055806.A25152C00B2@ozlabs.org>
Date:	Sat,  1 Feb 2014 16:58:06 +1100 (EST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Linux PPC <linuxppc-dev@...ts.ozlabs.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: Re: [PATCH 3/8] powerpc: add hvcalls for 24x7 and gpci (get performance counter info)

On Thu, 2014-16-01 at 23:53:49 UTC, Cody P Schafer wrote:
> Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
> ---
>  arch/powerpc/include/asm/hvcall.h | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
> index d8b600b..48d6efa 100644
> --- a/arch/powerpc/include/asm/hvcall.h
> +++ b/arch/powerpc/include/asm/hvcall.h
> @@ -269,11 +269,15 @@
>  #define H_COP			0x304
>  #define H_GET_MPP_X		0x314
>  #define H_SET_MODE		0x31C
> -#define MAX_HCALL_OPCODE	H_SET_MODE
> +#define H_GET_24X7_CATALOG_PAGE 0xF078
> +#define H_GET_24X7_DATA		0xF07C
> +#define H_GET_PERF_COUNTER_INFO 0xF080

Ugh, why the hell did they put them up there.

> +#define MAX_HCALL_OPCODE	H_GET_PERF_COUNTER_INFO

We have an array which is sized based on this, which is unpleasant.

I think you're better off putting these below in the platform specific section,
and leaving MAX_HCALL_OPCODE alone. The only downside is you can't use the
hcall tracing to see them.

>  /* Platform specific hcalls, used by KVM */
>  #define H_RTAS			0xf000


cheers
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