1 // SPDX-License-Identifier: GPL-2.0
20  * struct cpuidle_cooling_device - data for the idle cooling device
21  * @ii_dev: an atomic to keep track of the last task exiting the idle cycle
22  * @state: a normalized integer giving the state of the cooling device
26 	unsigned long state;  member
32  * cpuidle_cooling_runtime - Running time computation
33  * @idle_duration_us: CPU idle time to inject in microseconds
34  * @state: a percentile based number
36  * The running duration is computed from the idle injection duration
37  * which is fixed. If we reach 100% of idle injection ratio, that
39  * injection, that means we have equal duration for idle and for
44  *  running = idle x ((100 / ratio) - 1)
48  *  running = (idle x 100) / ratio - idle
51  * with 10ms of idle injection and 10ms of running duration.
56 					    unsigned long state)  in cpuidle_cooling_runtime()  argument
58 	if (!state)  in cpuidle_cooling_runtime()
61 	return ((idle_duration_us * 100) / state) - idle_duration_us;  in cpuidle_cooling_runtime()
65  * cpuidle_cooling_get_max_state - Get the maximum state
67  * @state : a pointer to the state variable to be filled
75 					 unsigned long *state)  in cpuidle_cooling_get_max_state()  argument
79 	 * cycle and the idle cycle could be different. We want to  in cpuidle_cooling_get_max_state()
80 	 * unify that to an 0..100 interval, so the set state  in cpuidle_cooling_get_max_state()
83 	 * The state 100% will make the cluster 100% ... idle. A 0%  in cpuidle_cooling_get_max_state()
84 	 * injection ratio means no idle injection at all and 50%  in cpuidle_cooling_get_max_state()
85 	 * means for 10ms of idle injection, we have 10ms of running  in cpuidle_cooling_get_max_state()
88 	*state = 100;  in cpuidle_cooling_get_max_state()
94  * cpuidle_cooling_get_cur_state - Get the current cooling state
96  * @state: a pointer to the state
98  * The function just copies  the state value from the private thermal
99  * cooling device structure, the mapping is 1 <-> 1.
104 					 unsigned long *state)  in cpuidle_cooling_get_cur_state()  argument
106 	struct cpuidle_cooling_device *idle_cdev = cdev->devdata;  in cpuidle_cooling_get_cur_state()
108 	*state = idle_cdev->state;  in cpuidle_cooling_get_cur_state()
114  * cpuidle_cooling_set_cur_state - Set the current cooling state
116  * @state: the target state
119  * in turn wakes up all the idle injection tasks belonging to the idle
120  * cooling device. In any case, it updates the internal state for the
126 					 unsigned long state)  in cpuidle_cooling_set_cur_state()  argument
128 	struct cpuidle_cooling_device *idle_cdev = cdev->devdata;  in cpuidle_cooling_set_cur_state()
129 	struct idle_inject_device *ii_dev = idle_cdev->ii_dev;  in cpuidle_cooling_set_cur_state()
130 	unsigned long current_state = idle_cdev->state;  in cpuidle_cooling_set_cur_state()
133 	idle_cdev->state = state;  in cpuidle_cooling_set_cur_state()
137 	runtime_us = cpuidle_cooling_runtime(idle_duration_us, state);  in cpuidle_cooling_set_cur_state()
141 	if (current_state == 0 && state > 0) {  in cpuidle_cooling_set_cur_state()
143 	} else if (current_state > 0 && !state)  {  in cpuidle_cooling_set_cur_state()
151  * cpuidle_cooling_ops - thermal cooling device ops
165  * structure, the idle injection, initialize them and register the
184 		ret = -ENOMEM;  in __cpuidle_cooling_register()
194 	ii_dev = idle_inject_register(drv->cpumask);  in __cpuidle_cooling_register()
196 		ret = -EINVAL;  in __cpuidle_cooling_register()
200 	of_property_read_u32(np, "duration-us", &idle_duration_us);  in __cpuidle_cooling_register()
201 	of_property_read_u32(np, "exit-latency-us", &latency_us);  in __cpuidle_cooling_register()
206 	idle_cdev->ii_dev = ii_dev;  in __cpuidle_cooling_register()
208 	snprintf(dev_name, sizeof(dev_name), "thermal-idle-%d", id);  in __cpuidle_cooling_register()
217 	pr_debug("%s: Idle injection set with idle duration=%u, latency=%u\n",  in __cpuidle_cooling_register()
233  * cpuidle_cooling_register - Idle cooling device initialization function
248 	for_each_cpu(cpu, drv->cpumask) {  in cpuidle_cooling_register()
252 		cooling_node = of_get_child_by_name(cpu_node, "thermal-idle");  in cpuidle_cooling_register()
257 			pr_debug("'thermal-idle' node not found for cpu%d\n", cpu);  in cpuidle_cooling_register()