Messages in this thread | | | Date | Wed, 12 Nov 2014 00:10:34 +0800 | From | Jiang Liu <> | Subject | Re: [PATCH 00/15] arm64: PCI/MSI: GICv3 ITS support (stacked domain edition) |
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Hi Marc, Sorry for the late notification. I have heavily reworked the interfaces for MSI irqdomain support based on review comments. Please refer to https://lkml.org/lkml/2014/11/9/88, please give your comments on the new interfaces:) Regards! Gerry
On 2014/11/11 23:47, Marc Zyngier wrote: > The GICv3 architecture provides a way to implement support for > MSI/MSI-X using a specific block called the ITS (Interrupt Translation > Service). > > The ITS can be accurately described as "page tables for > interrupts". If you think this sounds scary, you're spot on. It uses a > set of opaque memory tables that are manipulated through commands > (software almost never touches the tables directly). In order to make > it slightly easier to digest, the code has been split into (mostly) > logical units. > > To make things more fun, this relies on Jiang Liu's stacked domain > patch series [1]. In order to make this work, the first three patches > introduce support for stacked MSI domain on arm64 (the first patch is > just a version of a existing patch by Yingjoe Chen, and is only > included here for reference; the following two are the actual > implementation). > > I'd welcome some guidance of this stacked domain support, as this goes > into a slightly different direction compared to what we've had on > 32bit ARM so far (using the setup_irq/teardown_irq methods). > > This has been tested on arm64 with an FVP model, and is based on > 3.18-rc4 + Jiang's p2v5 series + a number of arm64-specific PCI > patches. The whole thing is available at: > > git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/stacked-its > > M. > > [1]: http://lwn.net/Articles/619388/ > > Marc Zyngier (15): > genirq: Add a few more helper funtions to support stacked irq_chip > PCI/MSI: genirq: allow architecture-specific override of flow handler > arm64: MSI: Add support for stacked MSI domain > irqchip: GICv3: Convert to domain hierarchy > irqchip: GICv3: rework redistributor structure > irqchip: GICv3: ITS command queue > irqchip: GICv3: ITS: irqchip implementation > irqchip: GICv3: ITS: LPI allocator > irqchip: GICv3: ITS: tables allocators > irqchip: GICv3: ITS: device allocation and configuration > irqchip: GICv3: ITS: MSI support > irqchip: GICv3: ITS: DT probing and initialization > irqchip: GICv3: ITS: plug ITS init into main GICv3 code > irqchip: GICv3: ITS: enable compilation of the ITS driver > irqchip: GICv3: Binding updates for ITS > > Documentation/devicetree/bindings/arm/gic-v3.txt | 39 + > arch/arm64/Kconfig | 1 + > arch/arm64/include/asm/msi.h | 26 + > arch/arm64/kernel/Makefile | 1 + > arch/arm64/kernel/msi.c | 80 ++ > drivers/irqchip/Kconfig | 5 + > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-gic-v3-its.c | 1343 ++++++++++++++++++++++ > drivers/irqchip/irq-gic-v3.c | 163 ++- > drivers/pci/msi.c | 7 +- > include/linux/irq.h | 6 + > include/linux/irqchip/arm-gic-v3.h | 128 +++ > kernel/irq/chip.c | 31 + > 13 files changed, 1790 insertions(+), 41 deletions(-) > create mode 100644 arch/arm64/include/asm/msi.h > create mode 100644 arch/arm64/kernel/msi.c > create mode 100644 drivers/irqchip/irq-gic-v3-its.c >
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