linux-kernel - Re: [PATCH 1/2] acpi: arm64: add iort support for PMCG

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Message-ID: <a8cd5d9c-3443-9864-48aa-c9c56d010fad@codeaurora.org>
Date:   Mon, 7 Aug 2017 16:52:02 -0400
From:   "Leeder, Neil" <nleeder@...eaurora.org>
To:     Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>
Cc:     Mark Langsdorf <mlangsdo@...hat.com>, Jon Masters <jcm@...hat.com>,
        Timur Tabi <timur@...eaurora.org>,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Mark Salter <msalter@...hat.com>,
        linux-arm-kernel@...ts.infradead.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH 1/2] acpi: arm64: add iort support for PMCG

Hi Robin,
Thank you for the review.

On 8/7/2017 7:17 AM, Robin Murphy wrote:
> Hi Neil,
> 
> On 04/08/17 20:59, Neil Leeder wrote:
[...]
>> +	res[1].start = pmcg->base_address + SZ_64K;
> 
> Ugh, I see there's a nasty spec hole here - IORT only defines one base
> address, but SMMUv3 says *both* pages have imp-def base addresses. I
> guess this assumption of them being in consecutive 64K regions holds for
> your platform, but as things stand it doesn't appear possible to rely on
> it generally :(
> 
> I'll follow up internally to see if we need to get IORT and/or SBSA
> updated or clarified.
> 
Thanks. I'll wait for the outcome before submitting a new patch.

[...]
>> diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
>> index 707dda74..2169b6f 100644
>> --- a/include/acpi/actbl2.h
>> +++ b/include/acpi/actbl2.h
> 
> Hopefully these changes are merely here for reference, but just in case
> it needs to be said, they should go as a separate patch via ACPICA
> (presumably there's also some corresponding iASL stuff to compile PMCG
> nodes in the first place).
> 
Yes, I'll submit this to ACPICA once the IORT addresses get figured out.

Neil
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