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Commit 547ecd3b authored by Pavankumar Kondeti's avatar Pavankumar Kondeti Committed by Gerrit - the friendly Code Review server
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drivers: thermal: cpu_cooling: Add a notifier for max level transitions 



Add a blocking notifier to send a notification when a CPU enters or
leaves the max cooling level state. Also add an API to retrieve
the cpumask that contains all CPUs that are in max cooling state.

Interested clients like core_ctl subscribe to these notifications
and manage CPUs accordingly.

Change-Id: I4828ed572fa965b5bfce8184ef813fddfb246cb1
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
[satyap@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent eee86f2a

drivers/thermal/cpu_cooling.c

+25 −0
Original line number Diff line number Diff line
@@ -129,6 +129,24 @@ static DEFINE_IDA(cpufreq_ida); 
static DEFINE_MUTEX(cooling_list_lock);

static LIST_HEAD(cpufreq_cdev_list);



static struct cpumask cpus_in_max_cooling_level;

static BLOCKING_NOTIFIER_HEAD(cpu_max_cooling_level_notifer);



void cpu_cooling_max_level_notifier_register(struct notifier_block *n)

{

	blocking_notifier_chain_register(&cpu_max_cooling_level_notifer, n);

}



void cpu_cooling_max_level_notifier_unregister(struct notifier_block *n)

{

	blocking_notifier_chain_unregister(&cpu_max_cooling_level_notifer, n);

}



const struct cpumask *cpu_cooling_get_max_level_cpumask(void)

{

	return &cpus_in_max_cooling_level;

}



/* Below code defines functions to be used for cpufreq as cooling device */



/**
@@ -621,6 +639,9 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, 
				cpumask_clear_cpu(cpu,

					&cpus_isolated_by_thermal);

		}

		cpumask_set_cpu(cpu, &cpus_in_max_cooling_level);

		blocking_notifier_call_chain(&cpu_max_cooling_level_notifer,

					     1, (void *)(long)cpu);

		return ret;

	} else if ((prev_state == cpufreq_cdev->max_level)

			&& (state < cpufreq_cdev->max_level)) {
@@ -634,6 +655,9 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, 
			&cpus_isolated_by_thermal)) {

			sched_unisolate_cpu(cpu);

		}

		cpumask_clear_cpu(cpu, &cpus_in_max_cooling_level);

		blocking_notifier_call_chain(&cpu_max_cooling_level_notifer,

					     0, (void *)(long)cpu);

	}

update_frequency:

	clip_freq = cpufreq_cdev->freq_table[state].frequency;
@@ -990,6 +1014,7 @@ __cpufreq_cooling_register(struct device_node *np, 
		register_pm_notifier(&cpufreq_cooling_pm_nb);

		cpumask_clear(&cpus_pending_online);

		cpumask_clear(&cpus_isolated_by_thermal);

		cpumask_clear(&cpus_in_max_cooling_level);

		INIT_WORK(&cpuhp_register_work, register_cdev);

		queue_work(system_wq, &cpuhp_register_work);

	}

include/linux/cpu_cooling.h

+18 −0
Original line number Diff line number Diff line
@@ -54,6 +54,9 @@ cpufreq_platform_cooling_register(const struct cpumask *clip_cpus, 
 */

void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);



extern void cpu_cooling_max_level_notifier_register(struct notifier_block *n);

extern void cpu_cooling_max_level_notifier_unregister(struct notifier_block *n);

extern const struct cpumask *cpu_cooling_get_max_level_cpumask(void);

#else /* !CONFIG_CPU_THERMAL */

static inline struct thermal_cooling_device *

cpufreq_cooling_register(struct cpufreq_policy *policy)
@@ -88,6 +91,21 @@ cpufreq_platform_cooling_register(const struct cpumask *clip_cpus, 
{

	return NULL;

}



static inline

void cpu_cooling_max_level_notifier_register(struct notifier_block *n)

{

}



static inline

void cpu_cooling_max_level_notifier_unregister(struct notifier_block *n)

{

}



static inline const struct cpumask *cpu_cooling_get_max_level_cpumask(void)

{

	return cpu_none_mask;

}

#endif /* defined(CONFIG_THERMAL_OF) && defined(CONFIG_CPU_THERMAL) */



#endif /* __CPU_COOLING_H__ */