linux-kernel - Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu

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Date:	Mon, 25 Jul 2016 10:21:10 -0500
From:	Rob Herring <robh@...nel.org>
To:	Robin Murphy <robin.murphy@....com>
Cc:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	Joerg Roedel <joro@...tes.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Sinan Kaya <okaya@...eaurora.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Tomasz Nowicki <tn@...ihalf.com>, Jon Masters <jcm@...hat.com>
Subject: Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF agnostic

On Mon, Jul 25, 2016 at 10:09 AM, Robin Murphy <robin.murphy@....com> wrote:
> Hi Lorenzo,
>
> On 20/07/16 12:23, Lorenzo Pieralisi wrote:
>> The iommu_fwspec structure, used to hold per device iommu configuration
>> data is not OF specific and therefore can be moved to a generic
>> and OF independent compilation unit.
>>
>> In particular, the iommu_fwspec handling hinges on the device_node
>> pointer to identify the IOMMU device associated with the iommu_fwspec
>> structure, that is easily converted to a more generic fwnode_handle
>> pointer that can cater for OF and non-OF (ie ACPI) systems.
>>
>> Create the files and related Kconfig entry to decouple iommu_fwspec
>> structure from the OF iommu kernel layer.
>>
>> Given that the current iommu_fwspec implementation relies on
>> the arch specific struct device.archdata.iommu field in its
>> implementation, by making the code standalone and independent
>> of the OF layer this patch makes sure that the iommu_fwspec
>> kernel code can be selected only on arches implementing the
>> struct device.archdata.iommu field by adding an explicit
>> arch dependency in its config entry.
>>
>> Current drivers using the iommu_fwspec for streamid translation
>> are converted to the new iommu_fwspec API by simply converting
>> the device_node to its fwnode_handle pointer.
>>
>> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>> Cc: Will Deacon <will.deacon@....com>
>> Cc: Hanjun Guo <hanjun.guo@...aro.org>
>> Cc: Robin Murphy <robin.murphy@....com>
>> Cc: Joerg Roedel <joro@...tes.org>
>> ---
>>  drivers/iommu/Kconfig        |   4 ++
>>  drivers/iommu/Makefile       |   1 +
>>  drivers/iommu/arm-smmu-v3.c  |  13 +++--
>>  drivers/iommu/iommu-fwspec.c | 114 +++++++++++++++++++++++++++++++++++++++++++
>>  drivers/iommu/of_iommu.c     |  52 --------------------
>>  include/linux/iommu-fwspec.h |  60 +++++++++++++++++++++++
>>  include/linux/of_iommu.h     |  24 +++------
>>  7 files changed, 196 insertions(+), 72 deletions(-)
>>  create mode 100644 drivers/iommu/iommu-fwspec.c
>>  create mode 100644 include/linux/iommu-fwspec.h
>>
>> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
>> index d1c66af..2b26bfb 100644
>> --- a/drivers/iommu/Kconfig
>> +++ b/drivers/iommu/Kconfig
>> @@ -67,6 +67,10 @@ config OF_IOMMU
>>         def_bool y
>>         depends on OF && IOMMU_API
>>
>> +config IOMMU_FWSPEC
>> +       def_bool y
>> +       depends on ARM64 && IOMMU_API
>
> I think that could be at least (ARM || ARM64).

Why any arch dependency?

Seems like OF_IOMMU (and ACPI?) should select this.

Rob