[PATCH v3 00/27] x86, irq: support ioapic device hotplug

[Yinghai Lu]

Hi,

Intel cpu (from IVB) include cpu, mem controller, and IIO.
When hotadd cpu physically, it will involve cpu hotplug, mem hotplug,
and pci root hotplug.

IIO includes pci host bridge, ioapic controller and iommu.
pci devices will need to use ioapic and iommu.
So to make pci root bus hotplug working, we need to add ioapic hotplug support.

Now ioapics are with ACPI MADT table. During booting, kernel will parse
MADT and put info into ioapic arrays.
Also Bjorn added one pci device based driver, but it is not wired in yet,
as it need to call acpi_register_ioapic, and that is TBD.

This patchset will
1. extend genirq to support reserve/realloc method.
   because we want irqs for one ioapic controller to be linear mapping
   to the gsi range.
2. change ioapic array operation code so we could insert new ioapic and
   remove one leave the blank slot.
3. record irq_base in gsi_config in ioapic struct, and use it to convert gsi
   to irq for pci device using that ioapic controller
4. make static ioapic path (from MADT) use same code as hot-add path,
   with reserve/realloc.
5. change ioapic add/removing to use acpi way, as that is only needed when
   pci root bus hotplug. Also make it support the case that ioapic
   controller is hiding in pci config space or ioapic address is not
   managed by pci reallocation subsys.

Also include some cleanups
1. print MSI-X clearly in /proc/interrupts and dmesg.
2. convert irq_2_pin to be generic list.

It is based on linus's tree of 2013/06/07 aka v3.10-rc3+.

could get them from:
        git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-x86-irq

-v3: split last patch to 4 patches per request from Bjorn.
     drop one patch that will put pci device name in proc/interrupts
     update changelog.

Yinghai Lu (27):
  x86, irq: Change irq_remap_modify_chip_defaults to static
  x86, irq: Modify irq chip once for irq remapping
  x86, irq: Print out MSI/MSI-X clearly
  x86, irq: Show MSI-X in /proc/interrupt
  x86, irq: Make dmar_msi/hpet_msi irq_chip name consistent
  ia64, irq: Add dummy create_irq_nr()
  iommu, irq: Allocate irq_desc for dmar_msi with local node
  x86, irq: kill create_irq()
  x86, irq: Convert irq_2_pin list to generic list
  genirq: Split __irq_reserve_irqs from irq_alloc_descs
  x86, irq: Add realloc_irq_and_cfg_at()
  x86, irq: Move down arch_early_irq_init()
  x86, irq: Split out alloc_ioapic_save_registers()
  xen, irq: call irq_realloc_desc_at() at first
  x86, irq: pre-reserve irq range/realloc for booting path
  x86, irq: Add ioapic_gsi_to_irq
  genirq: Bail out early in free_desc()
  x86, irq: More strict checking about registering ioapic
  x86, irq: Make mp_register_ioapic handle hot-added ioapic
  x86, irq: Add mp_unregister_ioapic to handle hot-remove ioapic
  x86, irq: Make ioapics loop skip blank slots
  x86, ioapic: Find usable ioapic id for 64bit.
  x86: Move declaration for mp_register_ioapic()
  PCI, x86: Make ioapic hotplug support built-in
  PCI, x86, ACPI: Link acpi ioapic register to ioapic
  PCI, x86, ACPI: Enable ioapic hotplug support with acpi host bridge.
  PCI, x86, ACPI: get ioapic address from acpi device

 arch/ia64/kernel/irq_ia64.c          |  10 +
 arch/x86/include/asm/hw_irq.h        |   2 +-
 arch/x86/include/asm/io_apic.h       |   7 +
 arch/x86/include/asm/irq_remapping.h |   6 -
 arch/x86/include/asm/mpspec.h        |  21 +-
 arch/x86/kernel/acpi/boot.c          |  32 +--
 arch/x86/kernel/apic/apic.c          |   9 +-
 arch/x86/kernel/apic/io_apic.c       | 441 ++++++++++++++++++++++++++---------
 drivers/acpi/pci_root.c              |   4 +
 drivers/iommu/dmar.c                 |   2 +-
 drivers/iommu/irq_remapping.c        |  16 +-
 drivers/pci/Kconfig                  |   3 +-
 drivers/pci/ioapic.c                 | 232 ++++++++++++------
 drivers/xen/events.c                 |   8 +-
 include/linux/irq.h                  |   6 +
 include/linux/pci-acpi.h             |   8 +
 kernel/irq/irqdesc.c                 |  83 +++++--
 17 files changed, 650 insertions(+), 240 deletions(-)

-- 
1.8.1.4

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