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

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Message-Id: <6bb74c36-854f-3be7-203f-fbf3ccad6909@linux.vnet.ibm.com>
Date:   Fri, 12 May 2017 09:20:35 +0530
From:   Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>
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 09:03 AM, Michael Ellerman wrote:
> Stewart Smith <stewart@...ux.vnet.ibm.com> writes:
>
>> 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.
> Yes, 100%.
>
> That's what I described in my replies to a previous version, if it
> doesn't do that we need to fix it.
Hi mpe,

Yes, as you suggested in the opal v11 patchset, we return OPAL_SUCCESS
from _INIT for type "Nest". Have also added a prerror message logging
for debug, but can get away with it or make it as a prlog.

Maddy
>
> cheers
>