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xtensa/perf: Convert the hotplug notifier to state machine callbacks 

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: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-xtensa@linux-xtensa.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153334.852575891@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2016-07-13 17:16:26 +00:00 committed by Ingo Molnar
parent fdc15a36d8
commit 25a77b55e7
2 changed files with 10 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/xtensa/kernel/perf_event.c
View File

@ -404,7 +404,7 @@ static struct pmu xtensa_pmu = {
.read = xtensa_pmu_read,
};
static void xtensa_pmu_setup(void)
static int xtensa_pmu_setup(int cpu)
{
unsigned i;
@ -413,21 +413,7 @@ static void xtensa_pmu_setup(void)
set_er(0, XTENSA_PMU_PMCTRL(i));
set_er(get_er(XTENSA_PMU_PMSTAT(i)), XTENSA_PMU_PMSTAT(i));
}
}
static int xtensa_pmu_notifier(struct notifier_block *self,
unsigned long action, void *data)
{
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
xtensa_pmu_setup();
break;
default:
break;
}
return NOTIFY_OK;
return 0;
}
static int __init xtensa_pmu_init(void)
@ -435,7 +421,13 @@ static int __init xtensa_pmu_init(void)
int ret;
int irq = irq_create_mapping(NULL, XCHAL_PROFILING_INTERRUPT);
perf_cpu_notifier(xtensa_pmu_notifier);
ret = cpuhp_setup_state(CPUHP_AP_PERF_XTENSA_STARTING,
"AP_PERF_XTENSA_STARTING", xtensa_pmu_setup,
NULL);
if (ret) {
pr_err("xtensa_pmu: failed to register CPU-hotplug.\n");
return ret;
}
#if XTENSA_FAKE_NMI
enable_irq(irq);
#else

1
include/linux/cpuhotplug.h
View File

@ -30,6 +30,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
CPUHP_AP_PERF_X86_CQM_STARTING,
CPUHP_AP_PERF_X86_CSTATE_STARTING,
CPUHP_AP_PERF_XTENSA_STARTING,
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
CPUHP_TEARDOWN_CPU,