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

[Yasuaki Ishimatsu]

(2014/09/24 17:10), Jiang Liu wrote:
> 
> 
> On 2014/9/24 15:59, Yasuaki Ishimatsu wrote:
>> (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
> Hi Yasuaki,
> 
> Do these help?
> http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg729924.html
> https://lkml.org/lkml/2014/8/1/67

Thank you for the information. I'll read it.

Thanks,
Yasuaki Ishimatsu

> 
> Regards!
> Gerry
> 
>>
>> 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(-)
>>>
>>
>>