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

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Date:	Mon, 12 Oct 2015 22:38:45 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Marc Zyngier <marc.zyngier@....com>,
	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 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,
Rafael

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