1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (c) 2018-2021, Arm ltd.
28 	return (dev->bus == &cpu_subsys);  in _is_cpu_device()
39 	snprintf(name, sizeof(name), "ps:%lu", ps->frequency);  in em_debug_create_ps()
41 	/* Create per-ps directory */  in em_debug_create_ps()
43 	debugfs_create_ulong("frequency", 0444, d, &ps->frequency);  in em_debug_create_ps()
44 	debugfs_create_ulong("power", 0444, d, &ps->power);  in em_debug_create_ps()
45 	debugfs_create_ulong("cost", 0444, d, &ps->cost);  in em_debug_create_ps()
46 	debugfs_create_ulong("inefficient", 0444, d, &ps->flags);  in em_debug_create_ps()
51 	seq_printf(s, "%*pbl\n", cpumask_pr_args(to_cpumask(s->private)));  in em_debug_cpus_show()
59 	struct em_perf_domain *pd = s->private;  in em_debug_flags_show()
61 	seq_printf(s, "%#lx\n", pd->flags);  in em_debug_flags_show()
72 	/* Create the directory of the performance domain */  in em_debug_create_pd()
76 		debugfs_create_file("cpus", 0444, d, dev->em_pd->cpus,  in em_debug_create_pd()
79 	debugfs_create_file("flags", 0444, d, dev->em_pd,  in em_debug_create_pd()
82 	/* Create a sub-directory for each performance state */  in em_debug_create_pd()
83 	for (i = 0; i < dev->em_pd->nr_perf_states; i++)  in em_debug_create_pd()
84 		em_debug_create_ps(&dev->em_pd->table[i], d);  in em_debug_create_pd()
110 	unsigned long power, freq, prev_freq = 0, prev_cost = ULONG_MAX;  in em_create_perf_table()  local
117 		return -ENOMEM;  in em_create_perf_table()
119 	/* Build the list of performance states for this performance domain */  in em_create_perf_table()
120 	for (i = 0, freq = 0; i < nr_states; i++, freq++) {  in em_create_perf_table()
122 		 * active_power() is a driver callback which ceils 'freq' to  in em_create_perf_table()
123 		 * lowest performance state of 'dev' above 'freq' and updates  in em_create_perf_table()
124 		 * 'power' and 'freq' accordingly.  in em_create_perf_table()
126 		ret = cb->active_power(dev, &power, &freq);  in em_create_perf_table()
137 		if (freq <= prev_freq) {  in em_create_perf_table()
138 			dev_err(dev, "EM: non-increasing freq: %lu\n",  in em_create_perf_table()
139 				freq);  in em_create_perf_table()
154 		table[i].frequency = prev_freq = freq;  in em_create_perf_table()
158 	fmax = (u64) table[nr_states - 1].frequency;  in em_create_perf_table()
159 	for (i = nr_states - 1; i >= 0; i--) {  in em_create_perf_table()
163 			ret = cb->get_cost(dev, table[i].frequency, &cost);  in em_create_perf_table()
185 	pd->table = table;  in em_create_perf_table()
186 	pd->nr_perf_states = nr_states;  in em_create_perf_table()
192 	return -EINVAL;  in em_create_perf_table()
209 			return -EINVAL;  in em_create_pd()
214 			return -ENOMEM;  in em_create_pd()
220 			return -ENOMEM;  in em_create_pd()
232 			cpu_dev->em_pd = pd;  in em_create_pd()
235 	dev->em_pd = pd;  in em_create_pd()
242 	struct em_perf_domain *pd = dev->em_pd;  in em_cpufreq_update_efficiencies()
257 	table = pd->table;  in em_cpufreq_update_efficiencies()
259 	for (i = 0; i < pd->nr_perf_states; i++) {  in em_cpufreq_update_efficiencies()
276 	pd->flags |= EM_PERF_DOMAIN_SKIP_INEFFICIENCIES;  in em_cpufreq_update_efficiencies()
280  * em_pd_get() - Return the performance domain for a device
281  * @dev : Device to find the performance domain for
283  * Returns the performance domain to which @dev belongs, or NULL if it doesn't
291 	return dev->em_pd;  in em_pd_get()
296  * em_cpu_get() - Return the performance domain for a CPU
297  * @cpu : CPU to find the performance domain for
299  * Returns the performance domain to which @cpu belongs, or NULL if it doesn't
315  * em_dev_register_perf_domain() - Register the Energy Model (EM) for a device
320  *		obligatory. It can be taken from i.e. 'policy->cpus'. For other
322  * @microwatts	: Flag indicating that the power values are in micro-Watts or
325  * Create Energy Model tables for a performance domain using the callbacks
329  * sub-systems might rely on this flag and check if all devices in the EM are
332  * If multiple clients register the same performance domain, all but the first
346 		return -EINVAL;  in em_dev_register_perf_domain()
350 	 * let the driver-defined callback functions sleep.  in em_dev_register_perf_domain()
354 	if (dev->em_pd) {  in em_dev_register_perf_domain()
355 		ret = -EEXIST;  in em_dev_register_perf_domain()
362 			ret = -EINVAL;  in em_dev_register_perf_domain()
369 				ret = -EEXIST;  in em_dev_register_perf_domain()
373 			 * All CPUs of a domain must have the same  in em_dev_register_perf_domain()
374 			 * micro-architecture since they all share the same  in em_dev_register_perf_domain()
382 				ret = -EINVAL;  in em_dev_register_perf_domain()
391 	else if (cb->get_cost)  in em_dev_register_perf_domain()
398 	dev->em_pd->flags |= flags;  in em_dev_register_perf_domain()
403 	dev_info(dev, "EM: created perf domain\n");  in em_dev_register_perf_domain()
412  * em_dev_unregister_perf_domain() - Unregister Energy Model (EM) for a device
419 	if (IS_ERR_OR_NULL(dev) || !dev->em_pd)  in em_dev_unregister_perf_domain()
427 	 * from potential clean-up/setup issues in the debugfs directories.  in em_dev_unregister_perf_domain()
433 	kfree(dev->em_pd->table);  in em_dev_unregister_perf_domain()
434 	kfree(dev->em_pd);  in em_dev_unregister_perf_domain()
435 	dev->em_pd = NULL;  in em_dev_unregister_perf_domain()