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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
