linux-kernel - Re: [PATCH v8 05/10] powerpc/perf: IMC pmu cpumask and cpuhotplug support

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Message-Id: <42effb3a-e747-97bf-2f78-255e94bbcf47@linux.vnet.ibm.com>
Date:   Fri, 12 May 2017 09:11:51 +0530
From:   Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:     Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>, mpe@...erman.id.au
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        ego@...ux.vnet.ibm.com, bsingharora@...il.com, anton@...ba.org,
        sukadev@...ux.vnet.ibm.com, mikey@...ling.org, eranian@...gle.com,
        hemant@...ux.vnet.ibm.com
Subject: Re: [PATCH v8 05/10] powerpc/perf: IMC pmu cpumask and cpuhotplug
 support



On Friday 12 May 2017 07:48 AM, Stewart Smith wrote:
> Madhavan Srinivasan <maddy@...ux.vnet.ibm.com> writes:
>>>       * in patch 9 should opal_imc_counters_init return something other
>>>         than OPAL_SUCCESS in the case on invalid arguments? Maybe
>>>         OPAL_PARAMETER? (I think you fix this in a later patch anyway?)
>> So, init call will return OPAL_PARAMETER for the unsupported
>> domains (core and nest are supported). And if the init operation
>> fails for any reason, it would return OPAL_HARDWARE. And this is
>> documented.
> (I'll comment on the skiboot one too), but I think that if the class
> exists but init is a no-op, then OPAL_IMC_COUNTERS_INIT should return
> OPAL_SUCCESS and just do nothing. This future proofs everything, and the
> API is that one *must* call _INIT before start.
Hi stewart,

Yes. mpe did mention this in his review. And i have made the same in the v11
of the opal patchset. Currently we return OPAL_SUCCESS from _INIT
incase of type "Nest". Additionally i have also added a message to be 
printed
  but i guess we can get away with that.

Maddy

>