[RFC Part2 v1 00/21] Enable hierarchy irqdomian on x86 platforms

Yasuaki Ishimatsu
2014-09-24T07:59:12Z

(2014/09/11 23:03), Jiang Liu wrote:
> We plan to restructure x86 interrupt code based on hierarchy irqdomain,
> that is to build irqdomains for CPU vector, interrupt remapping unit,
> IOAPIC, MSI and HPET etc and organize those irqdomains in hierarchy mode.
> Each irqdomain manages corresponding interrupt controller and talks to
> parent interrupt controller through public irqdomain interfaces. We also
> support stacked irq_chip based on hierarchy irqdomain. It will make the
> x86 interrupt architecture much more clear and more easy to maintain
> with hierarchy irqdomain and stacked irq_chip. It may also help ARM
> interrupt management architecture too.

Do you have a documentation which more detailed information is written?
I'm interested in this feature. And I want to know more detailed information.

I cannot imagine why the feature makes x86 irq architecture much more clear
and more easy to maintain in this description. Of course, I have read the
following threads:

https://lkml.org/lkml/2014/9/11/101

Thanks,
Yasuaki Ishimatsu

>
> This is the second patch set to enable support of hierarchy irqdomain
> on x86 platforms. It depends on the first part at:
> https://lkml.org/lkml/2014/9/11/101
> And you may access it at:
> https://github.com/jiangliu/linux.git irqdomain/p2v1
>
> And there will be a third patch set to convert IOAPIC driver to support
> hierarchy irqdomain and clean up code.
>
> The first patch extends irqdomain interfaces to support hierarchy
> irqdomain. Hope this interface could be used by other architectures too,
> such as ARM/ARM64.
> The second patch introduces two helper functions to support stacked
> irq_chip.
> Patch 3-9 implements an irqdomain to manange CPU interrupt vectors, and
> it's the root irqdomain for x86 platforms.
> Patch 10-13 converts Intel and AMD interrupt remapping drivers to
> support hierarchy irqdomain.
> Patch 14-17 converts HPET, MSI and HT_IRQ drivers to support hierarchy
> irqdomain.
> Patch 18-21 cleans up unsued code in x86 arch and interrupt remapping
> drivers.
>
> We have tested this patchset on Intel 32-bit and 64-bit systems. But we
> have only done compilation tests for HT_IRQ and AMD interrupt remapping
> drivers due to hardware resource limitation. Tests on AMD platforms are
> warmly welcomed!
>
> Jiang Liu (21):
> irqdomain: Introduce new interfaces to support hierarchy irqdomains
> genirq: Introduce helper functions to support stacked irq_chip
> x86, irq: Save destination CPU ID in irq_cfg
> x86, irq: Use hierarchy irqdomain to manage CPU interrupt vectors
> x86, hpet: Use new irqdomain interfaces to allocate/free IRQ
> x86, MSI: Use new irqdomain interfaces to allocate/free IRQ
> x86, uv: Use new irqdomain interfaces to allocate/free IRQ
> x86, htirq: Use new irqdomain interfaces to allocate/free IRQ
> x86, dmar: Use new irqdomain interfaces to allocate/free IRQ
> x86: irq_remapping: Introduce new interfaces to support hierarchy
> irqdomain
> iommu/vt-d: Change prototypes to prepare for enabling hierarchy
> irqdomain
> iommu/vt-d: Enhance Intel IR driver to suppport hierarchy irqdomain
> iommu/amd: Enhance AMD IR driver to suppport hierarchy irqdomain
> x86, hpet: Enhance HPET IRQ to support hierarchy irqdomain
> x86, MSI: Use hierarchy irqdomain to manage MSI interrupts
> x86, irq: Directly call native_compose_msi_msg() for DMAR IRQ
> x86, htirq: Use hierarchy irqdomain to manage Hypertransport
> interrupts
> iommu/vt-d: Clean up unused MSI related code
> iommu/amd: Clean up unused MSI related code
> x86: irq_remapping: Clean up unused MSI related code
> x86, irq: Clean up unused MSI related code and interfaces
>
> arch/x86/Kconfig | 3 +-
> arch/x86/include/asm/hpet.h | 16 +-
> arch/x86/include/asm/hw_irq.h | 64 +++++
> arch/x86/include/asm/irq_remapping.h | 66 +++--
> arch/x86/include/asm/pci.h | 5 -
> arch/x86/include/asm/x86_init.h | 4 -
> arch/x86/kernel/apic/htirq.c | 179 +++++++++----
> arch/x86/kernel/apic/io_apic.c | 3 -
> arch/x86/kernel/apic/msi.c | 430 +++++++++++++++++++++++--------
> arch/x86/kernel/apic/vector.c | 158 +++++++++++-
> arch/x86/kernel/hpet.c | 57 ++---
> arch/x86/kernel/x86_init.c | 2 -
> arch/x86/platform/uv/uv_irq.c | 27 +-
> drivers/iommu/amd_iommu.c | 385 ++++++++++++++++++++++------
> drivers/iommu/amd_iommu_init.c | 4 +
> drivers/iommu/amd_iommu_proto.h | 9 +
> drivers/iommu/amd_iommu_types.h | 5 +
> drivers/iommu/intel_irq_remapping.c | 468 +++++++++++++++++++++++-----------
> drivers/iommu/irq_remapping.c | 221 ++++++----------
> drivers/iommu/irq_remapping.h | 22 +-
> drivers/pci/htirq.c | 48 +---
> include/linux/htirq.h | 22 +-
> include/linux/intel-iommu.h | 4 +
> include/linux/irq.h | 8 +
> include/linux/irqdomain.h | 60 +++++
> kernel/irq/Kconfig | 3 +
> kernel/irq/chip.c | 21 ++
> kernel/irq/irqdomain.c | 349 ++++++++++++++++++++++++-
> 28 files changed, 1934 insertions(+), 709 deletions(-)
>