Commit 08a10002 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'pm-cpufreq-sched' 

* pm-cpufreq-sched:
  cpufreq: schedutil: Always process remote callback with slow switching
  cpufreq: schedutil: Don't restrict kthread to related_cpus unnecessarily
  cpufreq: Return 0 from ->fast_switch() on errors
  cpufreq: Simplify cpufreq_can_do_remote_dvfs()
  cpufreq: Process remote callbacks from any CPU if the platform permits
  sched: cpufreq: Allow remote cpufreq callbacks
  cpufreq: schedutil: Use unsigned int for iowait boost
  cpufreq: schedutil: Make iowait boost more energy efficient
parents bd87c8fb c49cbc19

drivers/cpufreq/cpufreq-dt.c

+1 −0
Original line number Diff line number Diff line
@@ -274,6 +274,7 @@ static int cpufreq_init(struct cpufreq_policy *policy) 
		transition_latency = CPUFREQ_ETERNAL;



	policy->cpuinfo.transition_latency = transition_latency;

	policy->dvfs_possible_from_any_cpu = true;



	return 0;

drivers/cpufreq/cpufreq.c

+4 −3
Original line number Diff line number Diff line
@@ -1843,9 +1843,10 @@ EXPORT_SYMBOL(cpufreq_unregister_notifier); 
 * twice in parallel for the same policy and that it will never be called in

 * parallel with either ->target() or ->target_index() for the same policy.

 *

 * If CPUFREQ_ENTRY_INVALID is returned by the driver's ->fast_switch()

 * callback to indicate an error condition, the hardware configuration must be

 * preserved.

 * Returns the actual frequency set for the CPU.

 *

 * If 0 is returned by the driver's ->fast_switch() callback to indicate an

 * error condition, the hardware configuration must be preserved.

 */

unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,

					unsigned int target_freq)

drivers/cpufreq/cpufreq_governor.c

+3 −0
Original line number Diff line number Diff line
@@ -272,6 +272,9 @@ static void dbs_update_util_handler(struct update_util_data *data, u64 time, 
	struct policy_dbs_info *policy_dbs = cdbs->policy_dbs;

	u64 delta_ns, lst;



	if (!cpufreq_can_do_remote_dvfs(policy_dbs->policy))

		return;



	/*

	 * The work may not be allowed to be queued up right now.

	 * Possible reasons:

drivers/cpufreq/intel_pstate.c

+8 −0
Original line number Diff line number Diff line
@@ -1746,6 +1746,10 @@ static void intel_pstate_update_util_pid(struct update_util_data *data, 
	struct cpudata *cpu = container_of(data, struct cpudata, update_util);

	u64 delta_ns = time - cpu->sample.time;



	/* Don't allow remote callbacks */

	if (smp_processor_id() != cpu->cpu)

		return;



	if ((s64)delta_ns < pid_params.sample_rate_ns)

		return;
@@ -1763,6 +1767,10 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time, 
	struct cpudata *cpu = container_of(data, struct cpudata, update_util);

	u64 delta_ns;



	/* Don't allow remote callbacks */

	if (smp_processor_id() != cpu->cpu)

		return;



	if (flags & SCHED_CPUFREQ_IOWAIT) {

		cpu->iowait_boost = int_tofp(1);

	} else if (cpu->iowait_boost) {

include/linux/cpufreq.h

+20 −0
Original line number Diff line number Diff line
@@ -127,6 +127,15 @@ struct cpufreq_policy { 
	 */

	unsigned int		transition_delay_us;



	/*

	 * Remote DVFS flag (Not added to the driver structure as we don't want

	 * to access another structure from scheduler hotpath).

	 *

	 * Should be set if CPUs can do DVFS on behalf of other CPUs from

	 * different cpufreq policies.

	 */

	bool			dvfs_possible_from_any_cpu;



	 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */

	unsigned int cached_target_freq;

	int cached_resolved_idx;
@@ -562,6 +571,17 @@ struct governor_attr { 
			 size_t count);

};



static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy)

{

	/*

	 * Allow remote callbacks if:

	 * - dvfs_possible_from_any_cpu flag is set

	 * - the local and remote CPUs share cpufreq policy

	 */

	return policy->dvfs_possible_from_any_cpu ||

		cpumask_test_cpu(smp_processor_id(), policy->cpus);

}



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