linux-kernel - Re: [RFC PATCH v2 00/15] ACPI IORT ARM SMMU v3 support

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Date:	Tue, 21 Jun 2016 15:27:04 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	iommu@...ts.linux-foundation.org,
	Will Deacon <will.deacon@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Tomasz Nowicki <tn@...ihalf.com>, Jon Masters <jcm@...hat.com>,
	Sinan Kaya <okaya@...eaurora.org>, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linuxarm@...wei.com
Subject: Re: [RFC PATCH v2 00/15] ACPI IORT ARM SMMU v3 support

Hi Hanjun,

On Tue, Jun 21, 2016 at 06:37:17PM +0800, Hanjun Guo wrote:
> Hi Lorenzo,
> 
> On 2016/6/7 21:30, Lorenzo Pieralisi wrote:
> >This RFC patch series is v2 of a previous posting:
> >
> >https://lkml.org/lkml/2016/4/14/702
> >
> >v1 -> v2:
> >	- Rebased on top of dependencies series [1][2][3](v4.7-rc1)
> >	- Removed IOMMU fwnode generalization
> >	- Implemented ARM SMMU v3 ACPI probing instead of ARM SMMU v2
> >	  owing to patch series dependencies [1]
> >	- Moved platform device creation logic to IORT code to
> >	  generalize its usage for ARM SMMU v1-v2-v3 components
> >	- Removed reliance on ACPI early device probing
> >	- Created IORT specific iommu_xlate() translation hook leaving
> >	  OF code unchanged according to v1 reviews
> >
> >The ACPI IORT table provides information that allows instantiating
> >ARM SMMU devices and carrying out id mappings between components on
> >ARM based systems (devices, IOMMUs, interrupt controllers).
> >
> >http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf
> >
> >Building on basic IORT support, available through [2]:
> >
> >this patchset enables ARM SMMU v3 support on ACPI systems.
> 
> I'm trying to test your patches on D03 (SMMUv3 based) but ...

What do you mean by "I am trying.." :), have you actually tested
this series ?

> [...]
> >[1] R.Murphy "Generic DT bindings for PCI and ARM SMMU v3"
> >    http://marc.info/?l=linux-arm-kernel&m=146497432413816&w=2
> 
> ...This patch set is still in discussion and seems not work
> for non-PCI devices.

Can you be more specific please ? Yes, both series are work
in progress.

> >[2] T.Nowicki "Introduce ACPI world to ITS irqchip" v5
> >    http://marc.info/?l=linux-acpi&m=146469369703684&w=2
> 
> Tomasz sent out the v7 and included patches in your series.
> 
> I think a updated version before the test makes sense, what
> do you think? Let me know your thoughts.

I am working with Robin so that the xlate() mechanism works
properly and seamlessly for both DT and ACPI, given the
dependencies I think it makes more sense to wait for Tomasz
and Robin patches to get merged or at least stabilize before
doing anything else, I am curently working on a v3.

Thanks,
Lorenzo