lkml.org 
[lkml]   [2014]   [Mar]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v4 0/2] Add stop callback to the cpufreq_driver interface.
Date
From: Dirk Brandewie <dirk.j.brandewie@intel.com>

Changes:
v3->v4
Change to only call ->stop() callback for drivers exposing the
->set_policy() callback.

v2->v3
Changed the calling of the ->stop() callback to be conditional on the
core being the last core controlled by a given policy.

v1->2
Change name of callback function added to cpufreq_driver interface.

Some drivers (intel_pstate) need to modify state on a core before it
is completely offline. The ->exit() callback is executed during the
CPU_POST_DEAD phase of the cpu offline process which is too late to
change the state of the core.

Patch 1 adds an optional callback function to the cpufreq_driver
interface which is called by the core during the CPU_DOWN_PREPARE
phase of cpu offline in __cpufreq_remove_dev_prepare().

Patch 2 changes intel_pstate to use the ->stop callback to do
its cleanup during cpu offline.

Dirk Brandewie (2):
cpufreq: Add exit_prepare callback to cpufreq_driver interface
intel_pstate: Set core to min P state during core offline

Documentation/cpu-freq/cpu-drivers.txt | 8 +++++++-
drivers/cpufreq/cpufreq.c | 3 +++
drivers/cpufreq/intel_pstate.c | 20 +++++++++++++-------
include/linux/cpufreq.h | 1 +
4 files changed, 24 insertions(+), 8 deletions(-)

--
1.8.3.1



\
 
 \ /
  Last update: 2014-03-19 17:01    [W:0.075 / U:26.852 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site