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Subject[tip:smp/hotplug] xtensa/perf: Convert the hotplug notifier to state machine callbacks
Commit-ID:  25a77b55e74c46c79f838a97e782a45c33588ca6
Gitweb: http://git.kernel.org/tip/25a77b55e74c46c79f838a97e782a45c33588ca6
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:26 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jul 2016 09:34:41 +0200

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>
---
arch/xtensa/kernel/perf_event.c | 26 +++++++++-----------------
include/linux/cpuhotplug.h | 1 +
2 files changed, 10 insertions(+), 17 deletions(-)

diff --git a/arch/xtensa/kernel/perf_event.c b/arch/xtensa/kernel/perf_event.c
index ef90479..0fecc8a 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
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 2ee3c0e..f187c46 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -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,
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