linux-kernel - Re: [PATCH v3 00/13] arm64: PCI/MSI: GICv3 ITS support (stacked domain edition)

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Date:	Wed, 26 Nov 2014 03:06:36 -0500
From:	Jason Cooper <jason@...edaemon.net>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Will Deacon <will.deacon@....com>,
	Catalin marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Robert Richter <robert.richter@...iumnetworks.com>,
	"Yun Wu (Abel)" <wuyun.wu@...wei.com>
Subject: Re: [PATCH v3 00/13] arm64: PCI/MSI: GICv3 ITS support (stacked
 domain edition)

Marc,

On Mon, Nov 24, 2014 at 02:35:07PM +0000, 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 as now merged in tip/irq/irqdomain:
> 
> - patch 1 imports the new asm-generic/msi.h file into arch/arm64
> - patches 2 to 13 are the bulk of the ITS driver.
> 
> This has been tested on arm64 with an FVP model, and is based on
> tip/irq/irqdomain. The whole thing is available at:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/gicv3-its
> 
> Unless someone screams murder, I consider this to be ready for merge.
> 
> 	M.
> 
> From v2 [2]:
> - rebased on top of the stable version of tip/irq/irqdomain
> - use irq_domain_reset_irq_data instead of
>   irq_domain_set_hwirq_and_chip on the free path
> - use pci_msi_mask_irq instead of mask_msi_irq
> - use host_data to pass the ITS structure around
> - top-level MSI domain is now indentified by the ITS of_node
> 
> From v1 [1]:
> - rebased on top of tip/irq/irqdomain
> - dropped the arm64-specific implementation of arch_setup_msi_irqs and co.
> - reworked the whole ITS/MSI setup to use the new MSI/PCI split
> 
> [1]: http://lwn.net/Articles/619788/
> [2]: https://lkml.org/lkml/2014/11/18/825
> 
> Marc Zyngier (13):
>   arm64: PCI/MSI: Use asm-generic/msi.h
>   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/Kbuild                    |    1 +
>  drivers/irqchip/Kconfig                          |    5 +
>  drivers/irqchip/Makefile                         |    1 +
>  drivers/irqchip/irq-gic-v3-its.c                 | 1402 ++++++++++++++++++++++
>  drivers/irqchip/irq-gic-v3.c                     |  156 ++-
>  include/linux/irqchip/arm-gic-v3.h               |  128 ++
>  8 files changed, 1693 insertions(+), 40 deletions(-)
>  create mode 100644 drivers/irqchip/irq-gic-v3-its.c

Applied to irqchip/core with a dependency on tip/irq/irqdomain

thx,

Jason.
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