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

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Message-ID: <52F0086F.60103@linux.vnet.ibm.com>
Date:	Mon, 03 Feb 2014 13:21:51 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Michael Ellerman <mpe@...erman.id.au>,
	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>
Subject: Re: [PATCH 3/8] powerpc: add hvcalls for 24x7 and gpci (get performance
 counter info)

On 01/31/2014 09:58 PM, Michael Ellerman wrote:
> 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.

Ya, I'm aware. I've got them up there as I did want to trace them :) . I 
don't see a big issue with moving them out of that section, though.

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


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