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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2016-07-13 20:16:26 +0300
committerIngo Molnar <mingo@kernel.org>2016-07-14 10:34:41 +0300
commit25a77b55e74c46c79f838a97e782a45c33588ca6 (patch)
tree36101813df1709267fb9bc93d4d78a82022d19b7 /arch/xtensa
parentfdc15a36d84eeb52f58b907f03fd8f77f5648235 (diff)
downloadlinux-25a77b55e74c46c79f838a97e782a45c33588ca6.tar.xz
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>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/kernel/perf_event.c26
1 files changed, 9 insertions, 17 deletions
diff --git a/arch/xtensa/kernel/perf_event.c b/arch/xtensa/kernel/perf_event.c
index ef90479e0397..0fecc8a2c0b5 100644
--- a/arch/xtensa/kernel/perf_event.c
+++ b/arch/xtensa/kernel/perf_event.c
@@ -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