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SubjectRe: [PATCH v11 0/2] irqchip: add support for GICv2m MSI controller
On Tue, Nov 25, 2014 at 06:47:21PM +0000, Marc Zyngier wrote:
> GICv2m is a very simple addition to the standard GICv2 interrupt
> controller, offering a way to convert writes from a device to a
> "wire-like" interrupt. Basically what we need to support MSI on the
> GIC.
>
> The v2m widget exposes a "frame", containing a read-only register
> describing the range of interrupts that are MSI-capable, as well as a
> doorbell that the device can kick to generate the interrupt. All the
> rest of the infrastructure is provided by the GIC itself (enabling,
> routing, ack/eoi...). This makes an ideal case for stacked irq
> domains.
>
> These patches were originally written by Suravee, but I've converted
> them to the stacked irq domains. As this turned out to be quite a
> sizeable rewrite of the original code, please blame me for any issue
> in this code, and not Suravee.
>
> Unsurprisingly, there is quite a long dependency chain here. You need:
> - Jiang's stacked domain patches, from tip/irq/irqdomain
> - The first patch in my GICv3 ITS series:
> https://lkml.org/lkml/2014/11/24/409
> - The first patch in Yingjoe's sysirq series:
> https://lkml.org/lkml/2014/11/25/130
>
> For everyone's convenience, I have a branch containing all that, and
> much more:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/v2m
>
> This has been fairly heavily tested on an arm64 platform driving a
> pair of igb interfaces.
>
> From v10:
> - Rewrote the driver to solely rely on irq domains, and not the
> setup_irq/teardown_irq methods that were used before (similar to what
> has been done for the GICv3 ITS).
>
> Suravee Suthikulpanit (2):
> irqchip: gicv2m: Add support for ARM GICv2m MSI(-X) doorbell
> irqchip: gicv2m: Add DT bindings for GICv2m
>
> Documentation/devicetree/bindings/arm/gic.txt | 53 ++++
> arch/arm64/Kconfig | 1 +
> drivers/irqchip/Kconfig | 6 +
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-gic-v2m.c | 333 ++++++++++++++++++++++++++
> drivers/irqchip/irq-gic.c | 4 +
> include/linux/irqchip/arm-gic.h | 2 +
> 7 files changed, 400 insertions(+)
> create mode 100644 drivers/irqchip/irq-gic-v2m.c

Both added to irqchip/core

thx,

Jason.


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