[PATCH V5 0/7] cpufreq: Use QoS layer to manage freq-constraints

[Viresh Kumar]

Hello,

This patchset attempts to manage CPU frequency constraints using the PM
QoS framework. It only does the basic stuff right now and moves the
userspace constraints to use the QoS infrastructure.

Todo:
- Migrate all users to the QoS framework and get rid of cpufreq specific
  notifiers.
- Make PM QoS learn about the relation of CPUs in a policy, so a single
  list of constraints is managed for all of them instead of per-cpu
  constraints.

V4->V5:
- A new patch added, 6/7.

V3->V4:
- Few commit logs updated as suggested during reviews.
- Separate commit (2/6) to create resume-latency specific routines
- Reused earlier work ("update") for notifiers as well.
- Kept Reviewed-by tags as is as the patches normally got better only.
  Please take them back if you find any issues.

V2->V3:
- Add a comment in cpufreq.c as suggested by Qais.
- Rebased on latest pm/linux-next.

V1->V2:
- The previous version introduced a completely new framework, this one
  moves to PM QoS instead.
- Lots of changes because of this.

--
viresh

[1] http://lore.kernel.org/lkml/cover.1560999838.git.viresh.kumar@xxxxxxxxxx


Viresh Kumar (7):
  PM / QOS: Pass request type to dev_pm_qos_{add|remove}_notifier()
  PM / QOS: Rename __dev_pm_qos_read_value() and
    dev_pm_qos_raw_read_value()
  PM / QOS: Pass request type to dev_pm_qos_read_value()
  PM / QoS: Add support for MIN/MAX frequency constraints
  cpufreq: Register notifiers with the PM QoS framework
  cpufreq: intel_pstate: Reuse refresh_frequency_limits()
  cpufreq: Add QoS requests for userspace constraints

 Documentation/power/pm_qos_interface.txt |  12 +-
 drivers/base/power/domain.c              |   8 +-
 drivers/base/power/domain_governor.c     |   4 +-
 drivers/base/power/qos.c                 | 135 +++++++++++++--
 drivers/base/power/runtime.c             |   2 +-
 drivers/cpufreq/cpufreq.c                | 201 ++++++++++++++++-------
 drivers/cpufreq/intel_pstate.c           |   7 +-
 drivers/cpuidle/governor.c               |   2 +-
 include/linux/cpufreq.h                  |  12 +-
 include/linux/pm_qos.h                   |  48 ++++--
 10 files changed, 320 insertions(+), 111 deletions(-)

-- 
2.21.0.rc0.269.g1a574e7a288b