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x86/x2apic: Convert to CPU hotplug state machine

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Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Len Brown <len.brown@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153337.736898691@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2016-07-13 17:17:00 +00:00 committed by Ingo Molnar
parent e722d8daaf
commit 6b2c28471d
2 changed files with 30 additions and 49 deletions
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78
arch/x86/kernel/apic/x2apic_cluster.c
View file

@ -152,68 +152,48 @@ static void init_x2apic_ldr(void)
}
}
/*
* At CPU state changes, update the x2apic cluster sibling info.
*/
static int
update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
/*
* At CPU state changes, update the x2apic cluster sibling info.
*/
int x2apic_prepare_cpu(unsigned int cpu)
{
unsigned int this_cpu = (unsigned long)hcpu;
unsigned int cpu;
int err = 0;
if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL))
return -ENOMEM;
switch (action) {
case CPU_UP_PREPARE:
if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, this_cpu),
GFP_KERNEL)) {
err = -ENOMEM;
} else if (!zalloc_cpumask_var(&per_cpu(ipi_mask, this_cpu),
GFP_KERNEL)) {
free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
err = -ENOMEM;
}
break;
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
for_each_online_cpu(cpu) {
if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
continue;
cpumask_clear_cpu(this_cpu, per_cpu(cpus_in_cluster, cpu));
cpumask_clear_cpu(cpu, per_cpu(cpus_in_cluster, this_cpu));
}
free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
free_cpumask_var(per_cpu(ipi_mask, this_cpu));
break;
if (!zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL)) {
free_cpumask_var(per_cpu(cpus_in_cluster, cpu));
return -ENOMEM;
}
return notifier_from_errno(err);
return 0;
}
static struct notifier_block x2apic_cpu_notifier = {
.notifier_call = update_clusterinfo,
};
static int x2apic_init_cpu_notifier(void)
int x2apic_dead_cpu(unsigned int this_cpu)
{
int cpu = smp_processor_id();
int cpu;
zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL);
BUG_ON(!per_cpu(cpus_in_cluster, cpu) || !per_cpu(ipi_mask, cpu));
cpumask_set_cpu(cpu, per_cpu(cpus_in_cluster, cpu));
register_hotcpu_notifier(&x2apic_cpu_notifier);
return 1;
for_each_online_cpu(cpu) {
if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
continue;
cpumask_clear_cpu(this_cpu, per_cpu(cpus_in_cluster, cpu));
cpumask_clear_cpu(cpu, per_cpu(cpus_in_cluster, this_cpu));
}
free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
free_cpumask_var(per_cpu(ipi_mask, this_cpu));
return 0;
}
static int x2apic_cluster_probe(void)
{
if (x2apic_mode)
return x2apic_init_cpu_notifier();
else
int cpu = smp_processor_id();
if (!x2apic_mode)
return 0;
cpumask_set_cpu(cpu, per_cpu(cpus_in_cluster, cpu));
cpuhp_setup_state(CPUHP_X2APIC_PREPARE, "X2APIC_PREPARE",
x2apic_prepare_cpu, x2apic_dead_cpu);
return 1;
}
static const struct cpumask *x2apic_cluster_target_cpus(void)

1
include/linux/cpuhotplug.h
View file

@ -17,6 +17,7 @@ enum cpuhp_state {
CPUHP_WORKQUEUE_PREP,
CPUHP_HRTIMERS_PREPARE,
CPUHP_PROFILE_PREPARE,
CPUHP_X2APIC_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_NOTIFY_PREPARE,
CPUHP_BRINGUP_CPU,