linux-kernel - [tip:smp/hotplug] irqchip/armada-370-xp: Convert to hotplug state machine

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Date:	Tue, 19 Jul 2016 00:00:01 -0700
From:	tip-bot for Richard Cochran <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	marc.zyngier@....com, rcochran@...utronix.de, peterz@...radead.org,
	torvalds@...ux-foundation.org, mingo@...nel.org,
	anna-maria@...utronix.de, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, hpa@...or.com, jason@...edaemon.net
Subject: [tip:smp/hotplug] irqchip/armada-370-xp: Convert to hotplug state
 machine

Commit-ID:  cb5ff2d245c1023f1004eca73038b2cae87bcc6a
Gitweb:     http://git.kernel.org/tip/cb5ff2d245c1023f1004eca73038b2cae87bcc6a
Author:     Richard Cochran <rcochran@...utronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:07 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 14 Jul 2016 09:34:29 +0200

irqchip/armada-370-xp: Convert to hotplug state machine

Install the callbacks via the state machine.

Signed-off-by: Richard Cochran <rcochran@...utronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
Acked-by: Jason Cooper <jason@...edaemon.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: rt@...utronix.de
Link: http://lkml.kernel.org/r/20160713153333.330661455@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/irqchip/irq-armada-370-xp.c | 44 +++++++++++++------------------------
 include/linux/cpuhotplug.h          |  2 ++
 2 files changed, 17 insertions(+), 29 deletions(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index e7dc6cb..e2b8fee 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -344,40 +344,22 @@ static void armada_mpic_send_doorbell(const struct cpumask *mask,
 	writel((map << 8) | irq, main_int_base +
 		ARMADA_370_XP_SW_TRIG_INT_OFFS);
 }
+#endif
 
-static int armada_xp_mpic_secondary_init(struct notifier_block *nfb,
-					 unsigned long action, void *hcpu)
+static int armada_xp_mpic_starting_cpu(unsigned int cpu)
 {
-	if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) {
-		armada_xp_mpic_perf_init();
-		armada_xp_mpic_smp_cpu_init();
-	}
-
-	return NOTIFY_OK;
+	armada_xp_mpic_perf_init();
+	armada_xp_mpic_smp_cpu_init();
+	return 0;
 }
 
-static struct notifier_block armada_370_xp_mpic_cpu_notifier = {
-	.notifier_call = armada_xp_mpic_secondary_init,
-	.priority = 100,
-};
-
-static int mpic_cascaded_secondary_init(struct notifier_block *nfb,
-					unsigned long action, void *hcpu)
+static int mpic_cascaded_starting_cpu(unsigned int cpu)
 {
-	if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) {
-		armada_xp_mpic_perf_init();
-		enable_percpu_irq(parent_irq, IRQ_TYPE_NONE);
-	}
-
-	return NOTIFY_OK;
+	armada_xp_mpic_perf_init();
+	enable_percpu_irq(parent_irq, IRQ_TYPE_NONE);
+	return 0;
 }
 
-static struct notifier_block mpic_cascaded_cpu_notifier = {
-	.notifier_call = mpic_cascaded_secondary_init,
-	.priority = 100,
-};
-#endif /* CONFIG_SMP */
-
 static const struct irq_domain_ops armada_370_xp_mpic_irq_ops = {
 	.map = armada_370_xp_mpic_irq_map,
 	.xlate = irq_domain_xlate_onecell,
@@ -595,11 +577,15 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node,
 		set_handle_irq(armada_370_xp_handle_irq);
 #ifdef CONFIG_SMP
 		set_smp_cross_call(armada_mpic_send_doorbell);
-		register_cpu_notifier(&armada_370_xp_mpic_cpu_notifier);
+		cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
+					  "AP_IRQ_ARMADA_XP_STARTING",
+					  armada_xp_mpic_starting_cpu, NULL);
 #endif
 	} else {
 #ifdef CONFIG_SMP
-		register_cpu_notifier(&mpic_cascaded_cpu_notifier);
+		cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_CASC_STARTING,
+					  "AP_IRQ_ARMADA_CASC_STARTING",
+					  mpic_cascaded_starting_cpu, NULL);
 #endif
 		irq_set_chained_handler(parent_irq,
 					armada_370_xp_mpic_handle_cascade_irq);
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 62ab4ff..3a08ab9 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -12,6 +12,8 @@ enum cpuhp_state {
 	CPUHP_AP_IRQ_GIC_STARTING,
 	CPUHP_AP_IRQ_GICV3_STARTING,
 	CPUHP_AP_IRQ_HIP04_STARTING,
+	CPUHP_AP_IRQ_ARMADA_XP_STARTING,
+	CPUHP_AP_IRQ_ARMADA_CASC_STARTING,
 	CPUHP_AP_NOTIFY_STARTING,
 	CPUHP_AP_ONLINE,
 	CPUHP_TEARDOWN_CPU,