Re: [PATCH 00/15] arm64: PCI/MSI: GICv3 ITS support (stacked domain edition)

From: Jiang Liu
Date: Tue Nov 11 2014 - 11:11:17 EST


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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