drivers/cpufreq/cpufreq.c

677  * cpufreq_parse_governor - parse a governor string only for has_target()
800 	else if (policy->governor)
801 		return sysfs_emit(buf, "%s\n", policy->governor->name);
919 	if (!policy->governor || !policy->governor->store_setspeed)
926 	policy->governor->store_setspeed(policy, freq);
933 	if (!policy->governor || !policy->governor->show_setspeed)
936 	return policy->governor->show_setspeed(policy, buf);
1123 		/* Update policy governor to the one used before hotplug. */
1126 			pr_debug("Restoring governor %s for cpu %d\n",
1145 			 * In case the default governor is neither "performance"
1182 			pr_err("%s: Failed to start governor\n", __func__);
1193 		cpufreq_set_policy(policy, policy->governor, policy->policy);
1392 	policy->governor = NULL;
1687 		/* Start the governor again for the active policy. */
1691 				pr_err("%s: Failed to start governor\n", __func__);
1698 		strscpy(policy->last_governor, policy->governor->name,
2037 				pr_err("%s: Failed to start governor for CPU%u's policy\n",
2417 	/* Don't start any governor operations if we are entering suspend */
2424 	if (!policy->governor)
2428 	if (policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING &&
2433 			pr_warn("Can't use %s governor as dynamic switching is disallowed. Fallback to %s governor\n",
2434 				policy->governor->name, gov->name);
2435 			policy->governor = gov;
2441 	if (!try_module_get(policy->governor->owner))
2446 	if (policy->governor->init) {
2447 		ret = policy->governor->init(policy);
2449 			module_put(policy->governor->owner);
2454 	policy->strict_target = !!(policy->governor->flags & CPUFREQ_GOV_STRICT_TARGET);
2461 	if (cpufreq_suspended || !policy->governor)
2466 	if (policy->governor->exit)
2467 		policy->governor->exit(policy);
2469 	module_put(policy->governor->owner);
2479 	if (!policy->governor)
2486 	if (policy->governor->start) {
2487 		ret = policy->governor->start(policy);
2492 	if (policy->governor->limits)
2493 		policy->governor->limits(policy);
2500 	if (cpufreq_suspended || !policy->governor)
2505 	if (policy->governor->stop)
2506 		policy->governor->stop(policy);
2511 	if (cpufreq_suspended || !policy->governor)
2516 	if (policy->governor->limits)
2517 		policy->governor->limits(policy);
2520 int cpufreq_register_governor(struct cpufreq_governor *governor)
2524 	if (!governor)
2533 	if (!find_governor(governor->name)) {
2535 		list_add(&governor->governor_list, &cpufreq_governor_list);
2543 void cpufreq_unregister_governor(struct cpufreq_governor *governor)
2548 	if (!governor)
2557 		if (!strcmp(policy->last_governor, governor->name)) {
2558 			policy->governor = NULL;
2565 	list_del(&governor->governor_list);
2612  * @new_gov: Policy governor pointer.
2618  * carry out a governor update for @policy.  That is, run the current governor's
2620  * @policy) or replace the governor for @policy with @new_gov.
2684 	if (new_gov == policy->governor) {
2685 		pr_debug("governor limits update\n");
2690 	pr_debug("governor switch\n");
2693 	old_gov = policy->governor;
2694 	/* end old governor */
2700 	/* start new governor */
2701 	policy->governor = new_gov;
2706 			pr_debug("governor change\n");
2712 	/* new governor failed, so re-start old one */
2713 	pr_debug("starting governor %s failed\n", policy->governor->name);
2715 		policy->governor = old_gov;
2717 			policy->governor = NULL;
2720 			policy->governor = NULL;