[PATCH v4 0/6] ACPI: Add _OST support for ACPI hotplug

[Toshi Kani]

This patchset supports ACPI OSPM Status Indication (_OST) method for
ACPI CPU/memory/container hotplug operations and sysfs eject. After
an ACPI hotplug operation has completed, OSPM calls _OST to indicate
the result of the operation to the platform. If a platform does not
support _OST, this patchset has no effect on the platform.

This _OST support is enabled when all relevant ACPI hotplug operations,
such as CPU, memory and container hotplug, are enabled. This assures
consistent behavior among the hotplug operations with regarding the
_OST support.

Some platforms may require the OS to support _OST in order to support
ACPI hotplug operations. For example, if a platform has the management
console where user can request a hotplug operation from, this _OST
support would be required for the management console to show the result
of the hotplug request to user.

The _OST definition can be found in section 6.3.5 of ACPI 5.0 spec.
The HPPF spec below also describes hotplug flows with _OST.

  DIG64 Hot-Plug & Partitioning Flow (HPPF) Specification R1.0
  http://www.dig64.org/home/DIG64_HPPF_R1_0.pdf

The changes have been tested with simulated _OST methods.

v4:
 - Removed CONFIG_ACPI_HOTPLUG_OST option.

v3:
 - Added more descriptions to the change logs.

v2:
 - Added CONFIG_ACPI_HOTPLUG_OST option. 
 - Added _OST support for container hotplug and sysfs eject.
 - Reordered patchset to enable _OST support bit of _OSC in the 
   last patch.

---
Toshi Kani (6):
 ACPI: Add an interface to evaluate _OST
 ACPI: Add _OST support for sysfs eject
 ACPI: Add _OST support for ACPI CPU hotplug
 ACPI: Add _OST support for ACPI memory hotplug
 ACPI: Add _OST support for ACPI container hotplug
 ACPI: Set hotplug _OST support bit to _OSC

 drivers/acpi/acpi_memhotplug.c  |   43 +++++++++++++++++++++-------
 drivers/acpi/bus.c              |    4 +++
 drivers/acpi/container.c        |   43 +++++++++++++++++++----------
 drivers/acpi/processor_driver.c |   28 +++++++++++++-----
 drivers/acpi/scan.c             |   58 +++++++++++++++++++++++++++++++++------
 drivers/acpi/utils.c            |   42 ++++++++++++++++++++++++++++
 include/acpi/acpi_bus.h         |   12 +++++++-
 include/linux/acpi.h            |   40 ++++++++++++++++++++++++++-
 8 files changed, 225 insertions(+), 45 deletions(-)

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