| Message ID | 1395163361-26380-2-git-send-email-dirk.j.brandewie@intel.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
On 18 March 2014 22:52, <dirk.brandewie@gmail.com> wrote: > From: Dirk Brandewie <dirk.j.brandewie@intel.com> > > 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> > --- > Documentation/cpu-freq/cpu-drivers.txt | 8 +++++++- > drivers/cpufreq/cpufreq.c | 3 ++- > include/linux/cpufreq.h | 1 + > 3 files changed, 10 insertions(+), 2 deletions(-) > > diff --git a/Documentation/cpu-freq/cpu-drivers.txt b/Documentation/cpu-freq/cpu-drivers.txt > index 8b1a445..79def80 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 - 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 > diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c > index cf485d9..6e6beae 100644 > --- a/drivers/cpufreq/cpufreq.c > +++ b/drivers/cpufreq/cpufreq.c > @@ -1336,7 +1336,8 @@ static int __cpufreq_remove_dev_prepare(struct device *dev, > __func__, new_cpu, cpu); > } > } > - } > + } else if (cpufreq_driver->stop) > + cpufreq_driver->stop(policy); > > return 0; > } > diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h > index 4d89e0e..ff8db19 100644 > --- a/include/linux/cpufreq.h > +++ b/include/linux/cpufreq.h > @@ -224,6 +224,7 @@ struct cpufreq_driver { > int (*bios_limit) (int cpu, unsigned int *limit); > > int (*exit) (struct cpufreq_policy *policy); > + int (*stop) (struct cpufreq_policy *policy); > int (*suspend) (struct cpufreq_policy *policy); > int (*resume) (struct cpufreq_policy *policy); > struct freq_attr **attr; Acked-by: Viresh Kumar <viresh.kumar@linaro.org> -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/cpu-freq/cpu-drivers.txt b/Documentation/cpu-freq/cpu-drivers.txt index 8b1a445..79def80 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 - 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 diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index cf485d9..6e6beae 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1336,7 +1336,8 @@ static int __cpufreq_remove_dev_prepare(struct device *dev, __func__, new_cpu, cpu); } } - } + } else if (cpufreq_driver->stop) + cpufreq_driver->stop(policy); return 0; } diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 4d89e0e..ff8db19 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -224,6 +224,7 @@ struct cpufreq_driver { int (*bios_limit) (int cpu, unsigned int *limit); int (*exit) (struct cpufreq_policy *policy); + int (*stop) (struct cpufreq_policy *policy); int (*suspend) (struct cpufreq_policy *policy); int (*resume) (struct cpufreq_policy *policy); struct freq_attr **attr;