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MIPS/Loongson-3: Convert oprofile to hotplug state machine

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

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <rric@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Cc: oprofile-list@lists.sf.net
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153337.054827168@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Richard Cochran 2016-07-13 17:16:53 +00:00 committed by Ingo Molnar
parent 4761adb6f4
commit 65264e3bc3
2 changed files with 15 additions and 21 deletions
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35
arch/mips/oprofile/op_model_loongson3.c
View file

@ -168,33 +168,26 @@ static int loongson3_perfcount_handler(void)
return handled;
}
static int loongson3_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
static int loongson3_starting_cpu(unsigned int cpu)
{
switch (action) {
case CPU_STARTING:
case CPU_STARTING_FROZEN:
write_c0_perflo1(reg.control1);
write_c0_perflo2(reg.control2);
break;
case CPU_DYING:
case CPU_DYING_FROZEN:
write_c0_perflo1(0xc0000000);
write_c0_perflo2(0x40000000);
break;
}
return NOTIFY_OK;
write_c0_perflo1(reg.control1);
write_c0_perflo2(reg.control2);
return 0;
}
static struct notifier_block loongson3_notifier_block = {
.notifier_call = loongson3_cpu_callback
};
static int loongson3_dying_cpu(unsigned int cpu)
{
write_c0_perflo1(0xc0000000);
write_c0_perflo2(0x40000000);
return 0;
}
static int __init loongson3_init(void)
{
on_each_cpu(reset_counters, NULL, 1);
register_hotcpu_notifier(&loongson3_notifier_block);
cpuhp_setup_state_nocalls(CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
"AP_MIPS_OP_LOONGSON3_STARTING",
loongson3_starting_cpu, loongson3_dying_cpu);
save_perf_irq = perf_irq;
perf_irq = loongson3_perfcount_handler;
@ -204,7 +197,7 @@ static int __init loongson3_init(void)
static void loongson3_exit(void)
{
on_each_cpu(reset_counters, NULL, 1);
unregister_hotcpu_notifier(&loongson3_notifier_block);
cpuhp_remove_state_nocalls(CPUHP_AP_MIPS_OP_LOONGSON3_STARTING);
perf_irq = save_perf_irq;
}

1
include/linux/cpuhotplug.h
View file

@ -35,6 +35,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_X86_CSTATE_STARTING,
CPUHP_AP_PERF_XTENSA_STARTING,
CPUHP_AP_PERF_METAG_STARTING,
CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
CPUHP_AP_ARM_VFP_STARTING,
CPUHP_AP_PERF_ARM_STARTING,
CPUHP_AP_ARM_L2X0_STARTING,