linux-kernel - Re: [PATCH v3 10/18] powerpc/vas, nx-842: Define and use chip_to_vas

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Date:   Wed, 22 Nov 2017 22:56:56 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Josh Boyer <jwboyer@...oraproject.org>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Neuling <mikey@...ling.org>, hbabu@...ibm.com,
        nicholas.piggin@...il.com,
        linuxppc-dev list <linuxppc-dev@...abs.org>,
        "Linux-Kernel\@Vger. Kernel. Org" <linux-kernel@...r.kernel.org>,
        "kernel-team\@fedoraproject.org" <kernel-team@...oraproject.org>
Subject: Re: [PATCH v3 10/18] powerpc/vas, nx-842: Define and use chip_to_vas_id()

Josh Boyer <jwboyer@...oraproject.org> writes:

> On Tue, Nov 7, 2017 at 9:23 PM, Sukadev Bhattiprolu
> <sukadev@...ux.vnet.ibm.com> wrote:
...
>> diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
>> index abb7090..cd9a733 100644
>> --- a/arch/powerpc/platforms/powernv/vas.c
>> +++ b/arch/powerpc/platforms/powernv/vas.c
>> @@ -123,6 +123,17 @@ struct vas_instance *find_vas_instance(int vasid)
>>         return NULL;
>>  }
>>
>> +int chip_to_vas_id(int chipid)
>> +{
>> +       int cpu;
>> +
>> +       for_each_possible_cpu(cpu) {
>> +               if (cpu_to_chip_id(cpu) == chipid)
>> +                       return per_cpu(cpu_vas_id, cpu);
>> +       }
>> +       return -1;
>> +}
>> +
>
> Likely need an EXPORT_SYMBOL here?

Yep.

>> diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c
>> index 874ddf5..eb221ed 100644
>> --- a/drivers/crypto/nx/nx-842-powernv.c
>> +++ b/drivers/crypto/nx/nx-842-powernv.c
>
> Did anyone test this driver built as a module with this commit included?

Clearly not.

I build allmodconfig:

  http://kisskb.ellerman.id.au/kisskb/buildresult/13207275/

Which was green.

But that doesn't enable this driver because it depends on PPC_VAS, which
depends on PPC_64K_PAGES, and allmodconfig chooses 4K pages because
that's the default in Kconfig.

I've added a config with allmodconfig + 64K pages to catch this in
future:

  http://kisskb.ellerman.id.au/kisskb/buildresult/13213014/

And we should probably flip 64K pages to be the default for 64-bit
Book3S as well, all contemporary CPUs are designed for it.

cheers