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

[Marc Zyngier]

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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2.0.4