linux-kernel - Re: [PATCH v2 10/11] powerpc/perf: add kconfig option for hypervisor provided counters

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Date:	Mon, 17 Feb 2014 11:41:26 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Michael Ellerman <mpe@...erman.id.au>
CC:	Scott Wood <scottwood@...escale.com>,
	Paul Bolle <pebolle@...cali.nl>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Tang Yuantian <yuantian.tang@...escale.com>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Priyanka Jain <Priyanka.Jain@...escale.com>,
	Lijun Pan <Lijun.Pan@...escale.com>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	Linux PPC <linuxppc-dev@...ts.ozlabs.org>,
	Anton Blanchard <anton@...ba.org>
Subject: Re: [PATCH v2 10/11] powerpc/perf: add kconfig option for hypervisor
 provided counters

On 02/16/2014 11:11 PM, Michael Ellerman wrote:
> On Fri, 2014-02-14 at 16:25 -0800, Cody P Schafer wrote:
>> On Fri, Feb 14, 2014 at 04:32:13PM -0600, Scott Wood wrote:
>>> On Fri, 2014-02-14 at 14:02 -0800, Cody P Schafer wrote:
>>>> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
>>>> index 434fda3..dcc67cd 100644
>>>> --- a/arch/powerpc/platforms/Kconfig.cputype
>>>> +++ b/arch/powerpc/platforms/Kconfig.cputype
>>>> @@ -364,6 +364,12 @@ config PPC_PERF_CTRS
>>>>          help
>>>>            This enables the powerpc-specific perf_event back-end.
>>>>
>>>> +config HV_PERF_CTRS
>>>> +       def_bool y
>>>> +       depends on PERF_EVENTS && PPC_HAVE_PMU_SUPPORT
>>>> +       help
>>>> +         Enable access to perf counters provided by the hypervisor
>>>
>>> Please don't add default-y stuff that is platform-specific, and
>>> definitely point out that platform dependency in the config description
>>> -- I have to look elsewhere in the patchset to determine that this is
>>> for "Power Hypervisor".  PPC_HAVE_PMU_SUPPORT is enabled by all 6xx
>>> builds, even for hardware like e300 that doesn't have PMU at all (it has
>>> the FSL embedded perfmon instead), much less this hv interface.
>>>
>>> And yes, PPC_PERF_CTRS has the same problem and should be fixed. :-)
>>
>> Yep, I just based this one on what PPC_PERF_CTRS was doing.
>>
>> How about the following:
>>
>> +config HV_PERF_CTRS
>> +       bool "Perf Hypervisor supplied counters"
>
> "Support for Hypervisor supplied PMU events (24x7 & GPCI)" ?

Sounds good to me.

>
>> +       default y
>> +       depends on PERF_EVENTS && PPC_HAVE_PMU_SUPPORT && PPC_PSERIES
>
> I think you just want:
>
> 	depends on PERF_EVENTS && PPC_PSERIES
>
>
> Because you're adding two completely new PMUs, they're not a "struct power_pmu"
> backend for the existing powerpc PMU implementation.
>

Ack. I'll fix this up in v3

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