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s390/perf: Convert the hotplug notifier to state machine callbacks (Sampling)

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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: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-s390@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153334.518084858@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2016-07-13 17:16:22 +00:00 committed by Ingo Molnar
parent 4f0f8217e6
commit e3d617fe6a
2 changed files with 19 additions and 25 deletions
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43
arch/s390/kernel/perf_cpum_sf.c
View File

@ -1506,37 +1506,28 @@ static void cpumf_measurement_alert(struct ext_code ext_code,
sf_disable();
}
}
static int cpumf_pmu_notifier(struct notifier_block *self,
unsigned long action, void *hcpu)
static int cpusf_pmu_setup(unsigned int cpu, int flags)
{
int flags;
/* Ignore the notification if no events are scheduled on the PMU.
* This might be racy...
*/
if (!atomic_read(&num_events))
return NOTIFY_OK;
return 0;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_ONLINE:
case CPU_DOWN_FAILED:
flags = PMC_INIT;
local_irq_disable();
setup_pmc_cpu(&flags);
local_irq_enable();
break;
case CPU_DOWN_PREPARE:
flags = PMC_RELEASE;
local_irq_disable();
setup_pmc_cpu(&flags);
local_irq_enable();
break;
default:
break;
}
local_irq_disable();
setup_pmc_cpu(&flags);
local_irq_enable();
return 0;
}
return NOTIFY_OK;
static int s390_pmu_sf_online_cpu(unsigned int cpu)
{
return cpusf_pmu_setup(cpu, PMC_INIT);
}
static int s390_pmu_sf_offline_cpu(unsigned int cpu)
{
return cpusf_pmu_setup(cpu, PMC_RELEASE);
}
static int param_get_sfb_size(char *buffer, const struct kernel_param *kp)
@ -1636,7 +1627,9 @@ static int __init init_cpum_sampling_pmu(void)
cpumf_measurement_alert);
goto out;
}
perf_cpu_notifier(cpumf_pmu_notifier);
cpuhp_setup_state(CPUHP_AP_PERF_S390_SF_ONLINE, "AP_PERF_S390_SF_ONLINE",
s390_pmu_sf_online_cpu, s390_pmu_sf_offline_cpu);
out:
return err;
}

1
include/linux/cpuhotplug.h
View File

@ -43,6 +43,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_X86_CQM_ONLINE,
CPUHP_AP_PERF_X86_CSTATE_ONLINE,
CPUHP_AP_PERF_S390_CF_ONLINE,
CPUHP_AP_PERF_S390_SF_ONLINE,
CPUHP_AP_NOTIFY_ONLINE,
CPUHP_AP_ONLINE_DYN,
CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30,