drivers/thermal/cpuidle_cooling.c

1 // SPDX-License-Identifier: GPL-2.0
21  * struct cpuidle_cooling_device - data for the idle cooling device
31  * cpuidle_cooling_runtime - Running time computation
35  * The running duration is computed from the idle injection duration
37  * means the running duration is zero. If we have a 50% ratio
39  * running duration.
43  *  running = idle x ((100 / ratio) - 1)
47  *  running = (idle x 100) / ratio - idle
50  * with 10ms of idle injection and 10ms of running duration.
60 	return ((idle_duration_us * 100) / state) - idle_duration_us;  in cpuidle_cooling_runtime()
64  * cpuidle_cooling_get_max_state - Get the maximum state
68  * The function always returns 100 as the injection ratio. It is
71  * Return: The function can not fail, it is always zero
77 	 * Depending on the configuration or the hardware, the running  in cpuidle_cooling_get_max_state()
84 	 * means for 10ms of idle injection, we have 10ms of running  in cpuidle_cooling_get_max_state()
93  * cpuidle_cooling_get_cur_state - Get the current cooling state
98  * cooling device structure, the mapping is 1 <-> 1.
100  * Return: The function can not fail, it is always zero
105 	struct cpuidle_cooling_device *idle_cdev = cdev->devdata;  in cpuidle_cooling_get_cur_state()
107 	*state = idle_cdev->state;  in cpuidle_cooling_get_cur_state()
113  * cpuidle_cooling_set_cur_state - Set the current cooling state
122  * Return: The function can not fail, it is always zero
127 	struct cpuidle_cooling_device *idle_cdev = cdev->devdata;  in cpuidle_cooling_set_cur_state()
128 	struct idle_inject_device *ii_dev = idle_cdev->ii_dev;  in cpuidle_cooling_set_cur_state()
129 	unsigned long current_state = idle_cdev->state;  in cpuidle_cooling_set_cur_state()
132 	idle_cdev->state = state;  in cpuidle_cooling_set_cur_state()
150  * cpuidle_cooling_ops - thermal cooling device ops
184 		ret = -ENOMEM;  in __cpuidle_cooling_register()
188 	ii_dev = idle_inject_register(drv->cpumask);  in __cpuidle_cooling_register()
190 		ret = -EINVAL;  in __cpuidle_cooling_register()
194 	of_property_read_u32(np, "duration-us", &idle_duration_us);  in __cpuidle_cooling_register()
195 	of_property_read_u32(np, "exit-latency-us", &latency_us);  in __cpuidle_cooling_register()
200 	idle_cdev->ii_dev = ii_dev;  in __cpuidle_cooling_register()
202 	dev = get_cpu_device(cpumask_first(drv->cpumask));  in __cpuidle_cooling_register()
204 	name = kasprintf(GFP_KERNEL, "idle-%s", dev_name(dev));  in __cpuidle_cooling_register()
206 		ret = -ENOMEM;  in __cpuidle_cooling_register()
235  * cpuidle_cooling_register - Idle cooling device initialization function
247 	for_each_cpu(cpu, drv->cpumask) {  in cpuidle_cooling_register()
251 		cooling_node = of_get_child_by_name(cpu_node, "thermal-idle");  in cpuidle_cooling_register()
256 			pr_debug("'thermal-idle' node not found for cpu%d\n", cpu);  in cpuidle_cooling_register()