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| author | Dirk Brandewie <dirk.j.brandewie@intel.com> | 2014-03-19 08:45:53 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-03-20 03:50:12 +0100 |
| commit | 367dc4aa932bfb33a3189064d33f7890a8ec1ca8 (patch) | |
| tree | fde9bd6004ff7852da144a373dd1c0536521efef /Documentation/cpu-freq | |
| parent | bda9f552f9826313ef8a477fc8e4891de9ae5e73 (diff) | |
| download | lwn-367dc4aa932bfb33a3189064d33f7890a8ec1ca8.tar.gz lwn-367dc4aa932bfb33a3189064d33f7890a8ec1ca8.zip | |
cpufreq: Add stop CPU callback to cpufreq_driver interface
This callback allows the driver to do clean up before the CPU is
completely down and its state cannot be modified. This is used
by the intel_pstate driver to reduce the requested P state prior to
the core going away. This is required because the requested P state
of the offline core is used to select the package P state. This
effectively sets the floor package P state to the requested P state on
the offline core.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
[rjw: Minor modifications]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/cpu-freq')
| -rw-r--r-- | Documentation/cpu-freq/cpu-drivers.txt | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/cpu-freq/cpu-drivers.txt b/Documentation/cpu-freq/cpu-drivers.txt index 8b1a4451422e..48da5fdcb9f1 100644 --- a/Documentation/cpu-freq/cpu-drivers.txt +++ b/Documentation/cpu-freq/cpu-drivers.txt @@ -61,7 +61,13 @@ target_index - See below on the differences. And optionally -cpufreq_driver.exit - A pointer to a per-CPU cleanup function. +cpufreq_driver.exit - A pointer to a per-CPU cleanup + function called during CPU_POST_DEAD + phase of cpu hotplug process. + +cpufreq_driver.stop_cpu - A pointer to a per-CPU stop function + called during CPU_DOWN_PREPARE phase of + cpu hotplug process. cpufreq_driver.resume - A pointer to a per-CPU resume function which is called with interrupts disabled |