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arm64/cpuinfo: Convert to hotplug state machine
Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: rt@linutronix.de Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20161126231350.10321-17-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -227,7 +227,7 @@ static struct attribute_group cpuregs_attr_group = {
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.name = "identification"
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};
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static int cpuid_add_regs(int cpu)
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static int cpuid_cpu_online(unsigned int cpu)
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{
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int rc;
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struct device *dev;
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@ -248,7 +248,7 @@ out:
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return rc;
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}
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static int cpuid_remove_regs(int cpu)
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static int cpuid_cpu_offline(unsigned int cpu)
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{
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struct device *dev;
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struct cpuinfo_arm64 *info = &per_cpu(cpu_data, cpu);
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@ -264,41 +264,22 @@ static int cpuid_remove_regs(int cpu)
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return 0;
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}
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static int cpuid_callback(struct notifier_block *nb,
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unsigned long action, void *hcpu)
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{
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int rc = 0;
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unsigned long cpu = (unsigned long)hcpu;
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switch (action & ~CPU_TASKS_FROZEN) {
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case CPU_ONLINE:
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case CPU_DOWN_FAILED:
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rc = cpuid_add_regs(cpu);
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break;
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case CPU_DOWN_PREPARE:
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rc = cpuid_remove_regs(cpu);
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break;
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}
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return notifier_from_errno(rc);
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}
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static int __init cpuinfo_regs_init(void)
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{
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int cpu;
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cpu_notifier_register_begin();
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int cpu, ret;
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for_each_possible_cpu(cpu) {
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struct cpuinfo_arm64 *info = &per_cpu(cpu_data, cpu);
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kobject_init(&info->kobj, &cpuregs_kobj_type);
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if (cpu_online(cpu))
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cpuid_add_regs(cpu);
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}
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__hotcpu_notifier(cpuid_callback, 0);
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cpu_notifier_register_done();
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ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm64/cpuinfo:online",
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cpuid_cpu_online, cpuid_cpu_offline);
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if (ret < 0) {
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pr_err("cpuinfo: failed to register hotplug callbacks.\n");
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return ret;
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}
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return 0;
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}
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static void cpuinfo_detect_icache_policy(struct cpuinfo_arm64 *info)
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