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257 lines
5.4 KiB
257 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2020 Linaro Limited |
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* |
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* Author: Daniel Lezcano <[email protected]> |
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* |
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* The DTPM CPU is based on the energy model. It hooks the CPU in the |
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* DTPM tree which in turns update the power number by propagating the |
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* power number from the CPU energy model information to the parents. |
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* |
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* The association between the power and the performance state, allows |
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* to set the power of the CPU at the OPP granularity. |
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* |
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* The CPU hotplug is supported and the power numbers will be updated |
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* if a CPU is hot plugged / unplugged. |
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*/ |
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#include <linux/cpumask.h> |
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#include <linux/cpufreq.h> |
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#include <linux/cpuhotplug.h> |
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#include <linux/dtpm.h> |
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#include <linux/energy_model.h> |
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#include <linux/pm_qos.h> |
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#include <linux/slab.h> |
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#include <linux/units.h> |
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static struct dtpm *__parent; |
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static DEFINE_PER_CPU(struct dtpm *, dtpm_per_cpu); |
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struct dtpm_cpu { |
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struct freq_qos_request qos_req; |
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int cpu; |
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}; |
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/* |
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* When a new CPU is inserted at hotplug or boot time, add the power |
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* contribution and update the dtpm tree. |
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*/ |
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static int power_add(struct dtpm *dtpm, struct em_perf_domain *em) |
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{ |
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u64 power_min, power_max; |
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power_min = em->table[0].power; |
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power_min *= MICROWATT_PER_MILLIWATT; |
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power_min += dtpm->power_min; |
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power_max = em->table[em->nr_perf_states - 1].power; |
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power_max *= MICROWATT_PER_MILLIWATT; |
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power_max += dtpm->power_max; |
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return dtpm_update_power(dtpm, power_min, power_max); |
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} |
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/* |
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* When a CPU is unplugged, remove its power contribution from the |
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* dtpm tree. |
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*/ |
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static int power_sub(struct dtpm *dtpm, struct em_perf_domain *em) |
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{ |
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u64 power_min, power_max; |
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power_min = em->table[0].power; |
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power_min *= MICROWATT_PER_MILLIWATT; |
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power_min = dtpm->power_min - power_min; |
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power_max = em->table[em->nr_perf_states - 1].power; |
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power_max *= MICROWATT_PER_MILLIWATT; |
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power_max = dtpm->power_max - power_max; |
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return dtpm_update_power(dtpm, power_min, power_max); |
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} |
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static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit) |
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{ |
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struct dtpm_cpu *dtpm_cpu = dtpm->private; |
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struct em_perf_domain *pd; |
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struct cpumask cpus; |
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unsigned long freq; |
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u64 power; |
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int i, nr_cpus; |
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pd = em_cpu_get(dtpm_cpu->cpu); |
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cpumask_and(&cpus, cpu_online_mask, to_cpumask(pd->cpus)); |
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nr_cpus = cpumask_weight(&cpus); |
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for (i = 0; i < pd->nr_perf_states; i++) { |
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power = pd->table[i].power * MICROWATT_PER_MILLIWATT * nr_cpus; |
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if (power > power_limit) |
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break; |
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} |
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freq = pd->table[i - 1].frequency; |
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freq_qos_update_request(&dtpm_cpu->qos_req, freq); |
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power_limit = pd->table[i - 1].power * |
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MICROWATT_PER_MILLIWATT * nr_cpus; |
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return power_limit; |
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} |
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static u64 get_pd_power_uw(struct dtpm *dtpm) |
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{ |
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struct dtpm_cpu *dtpm_cpu = dtpm->private; |
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struct em_perf_domain *pd; |
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struct cpumask cpus; |
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unsigned long freq; |
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int i, nr_cpus; |
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pd = em_cpu_get(dtpm_cpu->cpu); |
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freq = cpufreq_quick_get(dtpm_cpu->cpu); |
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cpumask_and(&cpus, cpu_online_mask, to_cpumask(pd->cpus)); |
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nr_cpus = cpumask_weight(&cpus); |
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for (i = 0; i < pd->nr_perf_states; i++) { |
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if (pd->table[i].frequency < freq) |
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continue; |
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return pd->table[i].power * |
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MICROWATT_PER_MILLIWATT * nr_cpus; |
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} |
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return 0; |
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} |
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static void pd_release(struct dtpm *dtpm) |
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{ |
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struct dtpm_cpu *dtpm_cpu = dtpm->private; |
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if (freq_qos_request_active(&dtpm_cpu->qos_req)) |
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freq_qos_remove_request(&dtpm_cpu->qos_req); |
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kfree(dtpm_cpu); |
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} |
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static struct dtpm_ops dtpm_ops = { |
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.set_power_uw = set_pd_power_limit, |
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.get_power_uw = get_pd_power_uw, |
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.release = pd_release, |
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}; |
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static int cpuhp_dtpm_cpu_offline(unsigned int cpu) |
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{ |
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struct cpufreq_policy *policy; |
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struct em_perf_domain *pd; |
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struct dtpm *dtpm; |
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policy = cpufreq_cpu_get(cpu); |
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if (!policy) |
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return 0; |
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pd = em_cpu_get(cpu); |
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if (!pd) |
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return -EINVAL; |
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dtpm = per_cpu(dtpm_per_cpu, cpu); |
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power_sub(dtpm, pd); |
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if (cpumask_weight(policy->cpus) != 1) |
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return 0; |
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for_each_cpu(cpu, policy->related_cpus) |
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per_cpu(dtpm_per_cpu, cpu) = NULL; |
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dtpm_unregister(dtpm); |
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return 0; |
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} |
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static int cpuhp_dtpm_cpu_online(unsigned int cpu) |
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{ |
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struct dtpm *dtpm; |
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struct dtpm_cpu *dtpm_cpu; |
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struct cpufreq_policy *policy; |
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struct em_perf_domain *pd; |
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char name[CPUFREQ_NAME_LEN]; |
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int ret = -ENOMEM; |
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policy = cpufreq_cpu_get(cpu); |
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if (!policy) |
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return 0; |
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pd = em_cpu_get(cpu); |
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if (!pd) |
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return -EINVAL; |
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dtpm = per_cpu(dtpm_per_cpu, cpu); |
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if (dtpm) |
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return power_add(dtpm, pd); |
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dtpm = dtpm_alloc(&dtpm_ops); |
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if (!dtpm) |
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return -EINVAL; |
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dtpm_cpu = kzalloc(sizeof(*dtpm_cpu), GFP_KERNEL); |
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if (!dtpm_cpu) |
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goto out_kfree_dtpm; |
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dtpm->private = dtpm_cpu; |
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dtpm_cpu->cpu = cpu; |
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for_each_cpu(cpu, policy->related_cpus) |
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per_cpu(dtpm_per_cpu, cpu) = dtpm; |
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sprintf(name, "cpu%d", dtpm_cpu->cpu); |
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ret = dtpm_register(name, dtpm, __parent); |
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if (ret) |
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goto out_kfree_dtpm_cpu; |
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ret = power_add(dtpm, pd); |
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if (ret) |
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goto out_dtpm_unregister; |
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ret = freq_qos_add_request(&policy->constraints, |
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&dtpm_cpu->qos_req, FREQ_QOS_MAX, |
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pd->table[pd->nr_perf_states - 1].frequency); |
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if (ret) |
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goto out_power_sub; |
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return 0; |
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out_power_sub: |
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power_sub(dtpm, pd); |
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out_dtpm_unregister: |
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dtpm_unregister(dtpm); |
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dtpm_cpu = NULL; |
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dtpm = NULL; |
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out_kfree_dtpm_cpu: |
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for_each_cpu(cpu, policy->related_cpus) |
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per_cpu(dtpm_per_cpu, cpu) = NULL; |
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kfree(dtpm_cpu); |
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out_kfree_dtpm: |
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kfree(dtpm); |
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return ret; |
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} |
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int dtpm_register_cpu(struct dtpm *parent) |
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{ |
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__parent = parent; |
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return cpuhp_setup_state(CPUHP_AP_DTPM_CPU_ONLINE, |
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"dtpm_cpu:online", |
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cpuhp_dtpm_cpu_online, |
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cpuhp_dtpm_cpu_offline); |
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}
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