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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-07-13 19:16:26 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-14 09:34:41 +0200 |
| commit | 25a77b55e74c46c79f838a97e782a45c33588ca6 (patch) | |
| tree | 36101813df1709267fb9bc93d4d78a82022d19b7 /arch/xtensa | |
| parent | bus/arm-ccn: Convert to hotplug statemachine (diff) | |
| download | linux-25a77b55e74c46c79f838a97e782a45c33588ca6.tar.xz linux-25a77b55e74c46c79f838a97e782a45c33588ca6.zip | |
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.c | 26 |
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 |