[PATCH v8 0/3] Xen/ACPI: support sleep state entering on hardware reduced systems

[Ben Guthro]

In version 3.4 acpi_os_prepare_sleep() got introduced in parallel with
reduced hardware sleep support, and the two changes didn't get
synchronized: The new code doesn't call the hook function (if so
requested). Fix this, requiring a new callback to be added to acpica
to be called back during this reduced hardware sleep.

This requires adjusting TXT, but the adjustments only go as far as
failing the extended mode call (since, looking at the TXT interface,
there doesn't even appear to be precautions to deal with that
alternative interface).

The xen hypervisor change underlying this is commit 62d1a69 ("ACPI: support
v5 (reduced HW) sleep interface") on the master branch of
git://xenbits.xen.org/xen.git.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Ben Guthro <benjamin.guthro@xxxxxxxxxx>
Cc: Richard L Maliszewski <richard.l.maliszewski@xxxxxxxxx>
Cc: Gang Wei <gang.wei@xxxxxxxxx>
Cc: Shane Wang <shane.wang@xxxxxxxxx>
Cc: Bob Moore <robert.moore@xxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
Cc: tboot-devel@xxxxxxxxxxxxxxxxxxxxx 

v2: Extend description to include reference to hypervisor side change
v3: Split into multiple patches, separating subsystems
    Remove bool parameters, in favor of u8
v4: Remove linux/acpi.h dependencies
    Further patch split to break out acpica from OSL
    More bool vs u8 fixes
v5: Fix build of consumers of acpi_os_prepare_sleep() interface change,
    so intermediate builds of partial patch series will not fail.
v6: Rebased to linux-pm linux-next branch
    Added warning in tboot early return code
    Added Reviewed-by lines
v7: Add separate acpi_os_prepare_extended_sleep() interface
    Remove OSL acpica changes introduced in v4
v8: Return meaningful error code in tboot error path

Ben Guthro (3):
  x86/acpi: Introduce acpi_os_prepare_extended_sleep callback for
    extended sleep path
  x86/tboot: Fail extended mode reduced hardware sleep
  xen/acpi: notify xen when reduced hardware sleep is available

 arch/x86/kernel/tboot.c          |   12 +++++++++++
 drivers/acpi/acpica/hwesleep.c   |    9 +++++++++
 drivers/acpi/osl.c               |   24 ++++++++++++++++++++++
 drivers/xen/acpi.c               |   41 ++++++++++++++++++++++++++------------
 include/linux/acpi.h             |    7 +++++++
 include/xen/acpi.h               |    8 ++++++--
 include/xen/interface/platform.h |    7 ++++---
 7 files changed, 90 insertions(+), 18 deletions(-)

-- 
1.7.9.5

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