linux-kernel - [tip:smp/hotplug] powerpc/perf: Convert book3s notifier to state machine callbacks

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Date:	Tue, 19 Jul 2016 00:06:28 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com,
	maddy@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
	mingo@...nel.org, anna-maria@...utronix.de,
	torvalds@...ux-foundation.org, paulus@...ba.org,
	sukadev@...ux.vnet.ibm.com, mpe@...erman.id.au,
	peterz@...radead.org, tglx@...utronix.de, bigeasy@...utronix.de,
	benh@...nel.crashing.org
Subject: [tip:smp/hotplug] powerpc/perf: Convert book3s notifier to state
 machine callbacks

Commit-ID:  57ecde42cc7493fb74029918d0a8f97aec854876
Gitweb:     http://git.kernel.org/tip/57ecde42cc7493fb74029918d0a8f97aec854876
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:20 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 14 Jul 2016 09:34:37 +0200

powerpc/perf: Convert book3s 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: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: rt@...utronix.de
Link: http://lkml.kernel.org/r/20160713153334.345786236@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/powerpc/perf/core-book3s.c | 30 +++++++-----------------------
 include/linux/cpuhotplug.h      |  1 +
 2 files changed, 8 insertions(+), 23 deletions(-)

diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 97a1d40..ffd61d5 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -2158,31 +2158,15 @@ static void perf_event_interrupt(struct pt_regs *regs)
 		irq_exit();
 }
 
-static void power_pmu_setup(int cpu)
+int power_pmu_prepare_cpu(unsigned int cpu)
 {
 	struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
 
-	if (!ppmu)
-		return;
-	memset(cpuhw, 0, sizeof(*cpuhw));
-	cpuhw->mmcr[0] = MMCR0_FC;
-}
-
-static int
-power_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:
-		power_pmu_setup(cpu);
-		break;
-
-	default:
-		break;
+	if (ppmu) {
+		memset(cpuhw, 0, sizeof(*cpuhw));
+		cpuhw->mmcr[0] = MMCR0_FC;
 	}
-
-	return NOTIFY_OK;
+	return 0;
 }
 
 int register_power_pmu(struct power_pmu *pmu)
@@ -2205,7 +2189,7 @@ int register_power_pmu(struct power_pmu *pmu)
 #endif /* CONFIG_PPC64 */
 
 	perf_pmu_register(&power_pmu, "cpu", PERF_TYPE_RAW);
-	perf_cpu_notifier(power_pmu_notifier);
-
+	cpuhp_setup_state(CPUHP_PERF_POWER, "PERF_POWER",
+			  power_pmu_prepare_cpu, NULL);
 	return 0;
 }
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index d54973e..b265e99 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -10,6 +10,7 @@ enum cpuhp_state {
 	CPUHP_PERF_X86_AMD_UNCORE_PREP,
 	CPUHP_PERF_X86_RAPL_PREP,
 	CPUHP_PERF_BFIN,
+	CPUHP_PERF_POWER,
 	CPUHP_NOTIFY_PREPARE,
 	CPUHP_BRINGUP_CPU,
 	CPUHP_AP_IDLE_DEAD,