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Message-ID: <542279D0.1040603@jp.fujitsu.com> Date: Wed, 24 Sep 2014 16:59:12 +0900 From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com> To: Jiang Liu <jiang.liu@...ux.intel.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Bjorn Helgaas <bhelgaas@...gle.com>, Randy Dunlap <rdunlap@...radead.org>, Yinghai Lu <yinghai@...nel.org>, Borislav Petkov <bp@...en8.de>, Grant Likely <grant.likely@...aro.org>, Marc Zyngier <marc.zyngier@....com> CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, Tony Luck <tony.luck@...el.com>, Joerg Roedel <joro@...tes.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, <x86@...nel.org>, <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>, <linux-acpi@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org> Subject: Re: [RFC Part2 v1 00/21] Enable hierarchy irqdomian on x86 platforms (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(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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