linux-kernel - Re: [PATCH 00/16] Divorcing irqdomain and device

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Message-ID: <561CBFC0.60206@arm.com>
Date:	Tue, 13 Oct 2015 09:24:32 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>,
	Jake Oshins <jakeo@...rosoft.com>
Subject: Re: [PATCH 00/16] Divorcing irqdomain and device_node

On 12/10/15 21:38, Rafael J. Wysocki wrote:
> On Sunday, October 11, 2015 11:01:17 PM Thomas Gleixner wrote:
>> On Tue, 6 Oct 2015, Marc Zyngier wrote:
>>> [This patch series used to be called "Making the generic ACPI GSI
>>> layer irqdomain aware", but as I've radically changed my approach to
>>> this problem, I've decided to reset the counters...]
>>>
>>> The irqdomain code is not entierely ACPI friendly, as it has some
>>> built-in knowledge of the device-tree. Nothing too harmful, but enough
>>> to scare the ARM ACPI developpers which end up with their own version
>>> of the square wheel. And some of the ramifications actually run deeper
>>> than initially expected.
>>>
>>> This series adapts the irqdomain code to use 'struct fwnode_handle'
>>> instead of 'struct device_node' as the identifier for a domain
>>> (compatibility interfaces are of course added). It also introduces a
>>> generic IRQ specifier that firmware interfaces (DT or ACPI) can
>>> directly use to configure interrupts, and allow the ACPI GSI code to
>>> be plugged into this.
>>>
>>> As examples, we convert the ARM GIC ACPI support to use irqdomains as
>>> originally intended, and rework the MSI code to also move away from
>>> using device nodes when using irqdomains.
>>>
>>> Overall, this gives us a way to use irqdomains on both DT and ACPI
>>> enabled platforms, having very little changes made to the actual
>>> drivers (other than the probing infrastructure). Because we keep the
>>> flow of information between the various layers identical between ACPI
>>> and DT, we immediately benefit from the existing infrastructure.
>>>
>>> This has been test-booted on Juno, is based on 4.3-rc4, and available at:
>>>
>>> git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/irq-domain-fwnode-v1
>>>
>>> Marc Zyngier (16):
>>>   irqdomain: Use an accessor for the of_node field
>>>   irqdomain: Convert irqdomain->of_node to fwnode
>>>   irqdomain: Allow irq domain lookup by fwnode
>>>   irqdomain: Introduce a firmware-specific IRQ specifier structure
>>>   irqchip: Convert all alloc/xlate users from of_node to fwnode
>>>   irqdomain: Introduce irq_create_fwspec_mapping
>>>   irqdomain: Introduce irq_domain_create_{linear,tree}
>>>   irqdomain: Add a fwnode_handle allocator
>>>   acpi/gsi: Always perform an irq domain lookup
>>>   acpi/gsi: Add acpi_set_irq_model to initialize the GSI layer
>>>   irqchip/gic: Get rid of gic_init_bases()
>>>   irqchip/gic: Switch ACPI support to stacked domains
>>>   irqchip/gic: Kill the xlate method
>>>   acpi/gsi: Cleanup acpi_register_gsi
>>>   irqdomain: Introduce irq_domain_create_hierarchy
>>>   irqdomain/msi: Use fwnode instead of of_node
>>
>> I really like this one way better than the previous attempts and I
>> couldn't find any real issue when going through them with a fine comb.
>>
>> I'd like to get that into 4.4, so I have to ask for the opinion of
>> ACPI folks. Having an ack on those patches would be nice.
> 
> I've ACKed the generic ones, please let me know if I missed any of them.
> 
> The rest seems to be ARM-specific ...

Thanks a lot Rafael.

I'll repost the series today with a couple of fixes so that Thomas can
stick it into -next.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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