Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1417989

[PATCH v2 0/5] Add suspend-to-idle validation for Intel SoCs

Show all headers | View raw

From: Derek Basehore <dbasehore@chromium.org>

This patch set adds support for catching errors when entering freeze
on Intel Skylake SoCs. Support for this can be added to newer SoCs in
later patches.

Verification is done by waking up the CPU up to 1000 seconds later
based on base 10 exponential backoff from 1 second to check the
residency of S0ix. This can't be verified before attempting to enter
S0ix through mwait, so we have to repeatedly verify entry into that
state. Successfully entering S0ix is no guarantee that it will be
entered on the next attempt, so we have to schedule another check.
This has a minimal average power impact of ~3uW on Skylake systems.
This leaves plenty of room for additional overhead based on changes
to the system.

This relies on the recently added patch "platform/x86: Add PMC Driver
for Intel Core SoC"

Changes for v2:
- Moved to exponential backoff for the freeze duration with a max of
  1000 seconds
- Changed to make the feature default off
- Add module parameter for enabling/disabling the feature instead of
  a debugfs entry

Derek Basehore (5):
  x86: stub out pmc function
  clockevents: Add timed freeze
  x86, apic: Add timed freeze support
  freeze: Add error reporting
  intel_idle: Add S0ix validation

 arch/x86/include/asm/pmc_core.h |   6 +-
 arch/x86/kernel/apic/apic.c     |  25 ++++++-
 drivers/acpi/processor_idle.c   |  10 ++-
 drivers/cpuidle/cpuidle.c       |  31 ++++++--
 drivers/idle/intel_idle.c       | 161 +++++++++++++++++++++++++++++++++++++---
 include/linux/clockchips.h      |  10 +++
 include/linux/cpuidle.h         |  10 ++-
 include/linux/suspend.h         |  10 +++
 kernel/power/suspend.c          |  11 ++-
 kernel/time/clockevents.c       | 117 +++++++++++++++++++++++++++++
 10 files changed, 361 insertions(+), 30 deletions(-)

-- 
2.8.0.rc3.226.g39d4020

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 0/5] Add suspend-to-idle validation for Intel SoCs dbasehore@chromium.org - 2016-06-09 02:50 +0200
  [PATCH v2 3/5] x86, apic: Add timed freeze support dbasehore@chromium.org - 2016-06-09 02:50 +0200
  [PATCH v2 1/5] x86: stub out pmc function dbasehore@chromium.org - 2016-06-09 02:50 +0200
  [PATCH v2 4/5] freeze: Add error reporting dbasehore@chromium.org - 2016-06-09 02:50 +0200

csiph-web