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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-03-26 14:15:13 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-04-02 00:43:05 +0300
commit5a25e3f7cc538fb49e11267c1e41c54ccf83835e (patch)
treee964c1948f3065cc885e0c36fe1b061c3d5ffd45 /include/linux/cpufreq.h
parent79a3aaa7b82e3106be97842dedfd8429248896e6 (diff)
downloadlinux-5a25e3f7cc538fb49e11267c1e41c54ccf83835e.tar.xz
cpufreq: intel_pstate: Driver-specific handling of _PPC updates
In some cases, the platform firmware disables or enables turbo frequencies for all CPUs globally before triggering a _PPC change notification for one of them. Obviously, that global change affects all CPUs, not just the notified one, and it needs to be acted upon by cpufreq. The intel_pstate driver is able to detect such global changes of the settings, but it also needs to update policy limits for all CPUs if that happens, in particular if turbo frequencies are enabled globally - to allow them to be used. For this reason, introduce a new cpufreq driver callback to be invoked on _PPC notifications, if present, instead of simply calling cpufreq_update_policy() for the notified CPU and make intel_pstate use it to trigger policy updates for all CPUs in the system if global settings change. Link: https://bugzilla.kernel.org/show_bug.cgi?id=200759 Reported-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'include/linux/cpufreq.h')
-rw-r--r--include/linux/cpufreq.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index b160e98076e3..5005ea40364f 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -195,6 +195,7 @@ void disable_cpufreq(void);
u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
void cpufreq_update_policy(unsigned int cpu);
+void cpufreq_update_limits(unsigned int cpu);
bool have_governor_per_policy(void);
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
@@ -322,6 +323,9 @@ struct cpufreq_driver {
/* should be defined, if possible */
unsigned int (*get)(unsigned int cpu);
+ /* Called to update policy limits on firmware notifications. */
+ void (*update_limits)(unsigned int cpu);
+
/* optional */
int (*bios_limit)(int cpu, unsigned int *limit);