1 // SPDX-License-Identifier: GPL-2.0
3  * Arch specific cpu topology information
11 #include <linux/cpu.h>
36 void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)  in topology_set_cpu_scale()  argument
38 	per_cpu(cpu_scale, cpu) = capacity;  in topology_set_cpu_scale()
45 	struct cpu *cpu = container_of(dev, struct cpu, dev);  in cpu_capacity_show()  local
47 	return sprintf(buf, "%lu\n", topology_get_cpu_scale(NULL, cpu->dev.id));  in cpu_capacity_show()
55 	struct cpu *cpu = container_of(dev, struct cpu, dev);  in cpu_capacity_store()  local
56 	int this_cpu = cpu->dev.id;  in cpu_capacity_store()
68 		return -EINVAL;  in cpu_capacity_store()
83 	struct device *cpu;  in register_cpu_capacity_sysctl()  local
86 		cpu = get_cpu_device(i);  in register_cpu_capacity_sysctl()
87 		if (!cpu) {  in register_cpu_capacity_sysctl()
88 			pr_err("%s: too early to get CPU%d device!\n",  in register_cpu_capacity_sysctl()
92 		device_create_file(cpu, &dev_attr_cpu_capacity);  in register_cpu_capacity_sysctl()
112 	u64 capacity;  in topology_normalize_cpu_scale()  local
113 	int cpu;  in topology_normalize_cpu_scale()  local
120 	for_each_possible_cpu(cpu) {  in topology_normalize_cpu_scale()
121 		pr_debug("cpu_capacity: cpu=%d raw_capacity=%u\n",  in topology_normalize_cpu_scale()
122 			 cpu, raw_capacity[cpu]);  in topology_normalize_cpu_scale()
123 		capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)  in topology_normalize_cpu_scale()
125 		topology_set_cpu_scale(cpu, capacity);  in topology_normalize_cpu_scale()
126 		pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",  in topology_normalize_cpu_scale()
127 			cpu, topology_get_cpu_scale(NULL, cpu));  in topology_normalize_cpu_scale()
132 bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)  in topology_parse_cpu_capacity()  argument
141 	ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",  in topology_parse_cpu_capacity()
155 		raw_capacity[cpu] = cpu_capacity;  in topology_parse_cpu_capacity()
157 			cpu_node, raw_capacity[cpu]);  in topology_parse_cpu_capacity()
160 			pr_err("cpu_capacity: missing %pOF raw capacity\n",  in topology_parse_cpu_capacity()
182 	int cpu;  in init_cpu_capacity_callback()  local
190 	pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",  in init_cpu_capacity_callback()
191 		 cpumask_pr_args(policy->related_cpus),  in init_cpu_capacity_callback()
194 	cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);  in init_cpu_capacity_callback()
196 	for_each_cpu(cpu, policy->related_cpus) {  in init_cpu_capacity_callback()
197 		raw_capacity[cpu] = topology_get_cpu_scale(NULL, cpu) *  in init_cpu_capacity_callback()
198 				    policy->cpuinfo.max_freq / 1000UL;  in init_cpu_capacity_callback()
199 		capacity_scale = max(raw_capacity[cpu], capacity_scale);  in init_cpu_capacity_callback()
221 	 * on ACPI-based systems we need to use the default cpu capacity  in register_cpufreq_notifier()
222 	 * until we have the necessary code to parse the cpu capacity, so  in register_cpufreq_notifier()
226 		return -EINVAL;  in register_cpufreq_notifier()
230 		return -ENOMEM;  in register_cpufreq_notifier()