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blackfin/perf: Convert hotplug notifier to state machine

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Install the callback via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Miao <realmz6@gmail.com>
Cc: adi-buildroot-devel@lists.sourceforge.net
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153334.265797537@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2016-07-13 17:16:19 +00:00 • committed by Ingo Molnar
parent 77c34ef1c3
commit a409f5ee29
2 changed files with 6 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

26
arch/blackfin/kernel/perf_event.c
View file

@ -453,29 +453,13 @@ static struct pmu pmu = {
.read = bfin_pmu_read, .read = bfin_pmu_read,
}; };
static void bfin_pmu_setup(int cpu) static int bfin_pmu_prepare_cpu(unsigned int cpu)
{ {
struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu); struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
bfin_write_PFCTL(0);
memset(cpuhw, 0, sizeof(struct cpu_hw_events)); memset(cpuhw, 0, sizeof(struct cpu_hw_events));
} return 0;
static int
bfin_pmu_notifier(struct notifier_block *self, unsigned long action, void *hcpu)
{
unsigned int cpu = (long)hcpu;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_UP_PREPARE:
bfin_write_PFCTL(0);
bfin_pmu_setup(cpu);
break;
default:
break;
}
return NOTIFY_OK;
} }
static int __init bfin_pmu_init(void) static int __init bfin_pmu_init(void)
@ -491,8 +475,8 @@ static int __init bfin_pmu_init(void)
ret = perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW); ret = perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW);
if (!ret) if (!ret)
perf_cpu_notifier(bfin_pmu_notifier); cpuhp_setup_state(CPUHP_PERF_BFIN, "PERF_BFIN",
bfin_pmu_prepare_cpu, NULL);
return ret; return ret;
} }
early_initcall(bfin_pmu_init); early_initcall(bfin_pmu_init);

1
include/linux/cpuhotplug.h
View file

@ -9,6 +9,7 @@ enum cpuhp_state {
CPUHP_PERF_X86_UNCORE_PREP, CPUHP_PERF_X86_UNCORE_PREP,
CPUHP_PERF_X86_AMD_UNCORE_PREP, CPUHP_PERF_X86_AMD_UNCORE_PREP,
CPUHP_PERF_X86_RAPL_PREP, CPUHP_PERF_X86_RAPL_PREP,
CPUHP_PERF_BFIN,
CPUHP_NOTIFY_PREPARE, CPUHP_NOTIFY_PREPARE,
CPUHP_BRINGUP_CPU, CPUHP_BRINGUP_CPU,
CPUHP_AP_IDLE_DEAD, CPUHP_AP_IDLE_DEAD,