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    Subject[RFC PATCH v3 00/28] ACPI based system device hotplug framework
    The patchset is based on "5f3d2f2e1a63679cf1c4a4210f2f1cc2f335bef6"
    from git://
    And you pull the changeset from git:// acpihp

    Modern high-end server may support advanced hotplug features for system
    devices, including physical processor, memory board, IO extension board
    and/or computer node. The ACPI specifications have provided standard
    interfaces between firmware and OS to support device hotplug at runtime.
    This patch series provide an ACPI based hotplug framework to support system
    device hotplug at runtime, which will replace current existing ACPI device
    driver based CPU/memory/CONTAINER hotplug mechanism.

    The new ACPI system device hotplug framework has following design goals:
    1) Provide a mechanism to detect hotplug slots by checking ACPI _EJ0 method,
    ACPI PRCT (platform RAS capabilities table) and other platform specific
    2) Unify the way to enumerate ACPI based hotplug slots. All hotplug slots
    will be enumerated by the enumeration driver, instead of by ACPI device
    3) Unify the way to handle ACPI hotplug events. All ACPI hotplug events
    for system devices will be handled by a generic ACPI hotplug driver,
    instead of handled by ACPI device drivers.
    4) Solve dependencies among hotplug slots. You need first to remove the
    memory device before removing a physical processor if a hotpluggable memory
    device is connected to a hotpluggable physical processor.
    5) Provide better error handling and recover.
    6) Provide interface to cancel ongoing hotplug operations. It may take a
    very long time to remove a memory device, so provide interface to cancel
    the operation. This is important especially for memory hot-removal.
    7) Support new RAS features, such as socket/memory migration.
    8) Provide better user interfaces to the hotplug functionalities.
    9) Trigger hotplug events/operations by software. This feature is useful
    for hardware fault management and power saving.

    The new ACPI based hotplug framework is modelled after PCI hotplug
    architecture, which uses a hotplug driver to manage hotplug operations
    and different device drivers to manage individual devices.

    The new framework contains three main components as follow:
    1) ACPI system device hotplug slot enumerator, which enumerates all ACPI
    hotplug slots according to platform specific knowledges. And it also
    provides callbacks to control each slot, such as poweron, poweroff,
    get_status etc. Currently there are two built-in methods to detect
    hotplug slots.
    1.a) Detecting hotplug slot by checking _EJ0 method.
    1.b) Faking hotplug slot. Use "modprobe acpihp_slot fake_slot=0xnn",
    0x1 for CONTAINER, 0x2 for memory device, 0x4 for CPU and 0x8 PCI host
    bridge. The fake slot enumerator will treat each assigned ACPI device
    as a hotplug slot, so it could be used for testing on hardware platforms
    without hardware hotplug capabilities.
    2) ACPI system device hotplug driver, which implements a platform indenpendent
    state machine for hotplug slots and also provides sysfs based user
    3) Enhanced ACPI device drivers for CONTAINER, CPU, Memroy and PCI host bridge.
    All logic to handle hotplug events has been moved from these ACPI device
    driver into the hotplug driver. Now these ACPI device dirvers only take
    resposibilities configure/unconfigure corresponding system devices when
    hotplug happens.

    Now 1), 2) and part of 2) are ready, we still need to enhance mem_hotplug
    and pci_root drivers to support new hotplug framework.

    On my laptop with fake slot enumerator, we got:
    root@cat:/sys/devices/LNXSYSTM:00/acpihp# ls
    CPU00 CPU01 CPU02 CPU03 CPU04 CPU05 CPU06 CPU07 IOX00
    root@cat:/sys/devices/LNXSYSTM:00/acpihp# cd CPU07/
    root@cat:/sys/devices/LNXSYSTM:00/acpihp/CPU07# ls
    capabilities connect device object state subsystem uevent
    configure dependency enable power status type

    /* Hot-remove CPU07 */
    root@cat:/sys/devices/LNXSYSTM:00/acpihp/CPU07# echo 0 > enable
    /* Hot-add CPU07 */
    root@cat:/sys/devices/LNXSYSTM:00/acpihp/CPU07# echo 1 > configure

    V2->V3 changes:
    1) Fix minor bugs and refine code
    2) Implement fake slot enumerator for testing
    3) Enhance ACPI container driver to support new hotplug framework
    4) Enhance ACPI processor driver to support new hotplug framework
    5) Resolve dependencies among slots by evaluating _EDL method.
    1) Enhance ACPI mem_hotplug driver to support new hotplug framework
    2) Enhance ACPI pci_root driver to support new PCI host bridge hotplug
    based on Yinghai's work

    V1->V2 changes:
    1) implement the ACPI hotplug driver
    2) enhance ACPI container driver to support new hotplug framework
    1) handle ACPI hotplug events in ACPI hotplug driver
    2) handle dependencies among slots by evaluating ACPI _EDL
    3) enhance ACPI processor, memory and PCI root drivers to support new
    hotplug framework
    4) develop an ACPI driver for IOAPIC
    5) thorough tests:)

    Jiang Liu (28):
    ACPIHP: introduce a framework for ACPI based system device hotplug
    ACPIHP: ACPI system device hotplug slot enumerator driver
    ACPIHP: detect ACPI hotplug slots by checking ACPI _EJ0 method
    ACPIHP: implement a fake ACPI system device hotplug slot enumerator
    ACPI: introduce interfaces to manage ACPI device reference count
    ACPIHP: introduce interfaces to scan and walk ACPI devices connecting
    to a slot
    ACPIHP: use klist to manage ACPI devices connecting to a slot
    ACPIHP: add callbacks into acpi_device_ops to support new hotplug
    ACPIHP: provide interfaces to associate driver specific data with
    ACPIHP: implement utility functions to support system device hotplug
    ACPIHP: implement skeleton of ACPI system device hotplug driver
    ACPIHP: analyse dependencies among ACPI hotplug slots
    ACPIHP: provide interface to cancel inprogress hotplug operations
    ACPIHP: configure/unconfigure system devices connecting to a hotplug
    ACPIHP: implement the state machine for ACPI hotplug slots
    ACPIHP: implement sysfs interfaces for ACPI system device hotplug
    ACPIHP: block ACPI device driver unloading when executing hotplug
    ACPIHP/container: change ACPI container driver to support new hotplug
    ACPIHP/container: move container.c into drivers/acpi/hotplug
    ACPI/processor: remove dead code from processor_driver.c
    ACPIHP/processor: reorganize ACPI processor driver for new hotplug
    ACPIHP/processor: protect accesses to device->driver_data
    ACPIHP/processor: enhance processor driver to support new hotplug
    CPU: introduce busy flag to temporarily disable CPU online sysfs
    ACPIHP/processor: reject online/offline requests when doing processor
    ACPI/processor: save parsed APIC ID in processor driver data
    x86: simplify _acpi_map_lsapic()
    ACPI/processor: serialize call to acpi_map/unmap_lsapic

    arch/ia64/include/asm/cpu.h | 2 +-
    arch/ia64/kernel/acpi.c | 38 +-
    arch/ia64/kernel/topology.c | 15 +-
    arch/x86/include/asm/cpu.h | 2 +-
    arch/x86/include/asm/mpspec.h | 2 +-
    arch/x86/kernel/acpi/boot.c | 82 +---
    arch/x86/kernel/apic/apic.c | 8 +-
    arch/x86/kernel/topology.c | 10 +-
    drivers/acpi/Kconfig | 69 ++-
    drivers/acpi/Makefile | 3 +-
    drivers/acpi/bus.c | 22 +-
    drivers/acpi/container.c | 296 -----------
    drivers/acpi/hotplug/Makefile | 21 +
    drivers/acpi/hotplug/acpihp.h | 37 ++
    drivers/acpi/hotplug/acpihp_drv.h | 107 ++++
    drivers/acpi/hotplug/cancel.c | 174 +++++++
    drivers/acpi/hotplug/configure.c | 354 ++++++++++++++
    drivers/acpi/hotplug/container.c | 135 +++++
    drivers/acpi/hotplug/core.c | 842 ++++++++++++++++++++++++++++++++
    drivers/acpi/hotplug/dependency.c | 249 ++++++++++
    drivers/acpi/hotplug/device.c | 208 ++++++++
    drivers/acpi/hotplug/drv_main.c | 351 +++++++++++++
    drivers/acpi/hotplug/slot.c | 421 ++++++++++++++++
    drivers/acpi/hotplug/slot_ej0.c | 153 ++++++
    drivers/acpi/hotplug/slot_fake.c | 177 +++++++
    drivers/acpi/hotplug/state_machine.c | 631 ++++++++++++++++++++++++
    drivers/acpi/hotplug/sysfs.c | 245 ++++++++++
    drivers/acpi/internal.h | 7 +
    drivers/acpi/processor_core.c | 26 +-
    drivers/acpi/processor_driver.c | 557 ++++++++++-----------
    drivers/acpi/scan.c | 17 +-
    drivers/base/cpu.c | 22 +
    drivers/gpu/drm/i915/intel_opregion.c | 2 +
    drivers/gpu/drm/nouveau/nouveau_acpi.c | 1 +
    drivers/pci/hotplug/acpiphp_glue.c | 9 +-
    drivers/pci/hotplug/acpiphp_ibm.c | 5 +-
    drivers/pci/hotplug/sgi_hotplug.c | 6 +-
    drivers/platform/x86/thinkpad_acpi.c | 2 +
    drivers/pnp/pnpacpi/core.c | 23 +-
    drivers/xen/cpu_hotplug.c | 2 +-
    include/acpi/acpi_bus.h | 21 +-
    include/acpi/acpi_hotplug.h | 323 ++++++++++++
    include/acpi/container.h | 12 -
    include/acpi/processor.h | 3 +
    include/linux/acpi.h | 2 +-
    include/linux/cpu.h | 2 +
    46 files changed, 4923 insertions(+), 773 deletions(-)
    delete mode 100644 drivers/acpi/container.c
    create mode 100644 drivers/acpi/hotplug/Makefile
    create mode 100644 drivers/acpi/hotplug/acpihp.h
    create mode 100644 drivers/acpi/hotplug/acpihp_drv.h
    create mode 100644 drivers/acpi/hotplug/cancel.c
    create mode 100644 drivers/acpi/hotplug/configure.c
    create mode 100644 drivers/acpi/hotplug/container.c
    create mode 100644 drivers/acpi/hotplug/core.c
    create mode 100644 drivers/acpi/hotplug/dependency.c
    create mode 100644 drivers/acpi/hotplug/device.c
    create mode 100644 drivers/acpi/hotplug/drv_main.c
    create mode 100644 drivers/acpi/hotplug/slot.c
    create mode 100644 drivers/acpi/hotplug/slot_ej0.c
    create mode 100644 drivers/acpi/hotplug/slot_fake.c
    create mode 100644 drivers/acpi/hotplug/state_machine.c
    create mode 100644 drivers/acpi/hotplug/sysfs.c
    create mode 100644 include/acpi/acpi_hotplug.h
    delete mode 100644 include/acpi/container.h


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