linux-kernel - [tip:smp/hotplug] irqchip/hip04: Convert to hotplug state machine

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Date:	Mon, 18 Jul 2016 23:59:31 -0700
From:	tip-bot for Richard Cochran <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jason@...edaemon.net, hpa@...or.com, tglx@...utronix.de,
	anna-maria@...utronix.de, mingo@...nel.org, marc.zyngier@....com,
	bigeasy@...utronix.de, rcochran@...utronix.de,
	peterz@...radead.org, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [tip:smp/hotplug] irqchip/hip04: Convert to hotplug state machine

Commit-ID:  6c034d1736384c23ea97509e36e84f35f4a9b23c
Gitweb:     http://git.kernel.org/tip/6c034d1736384c23ea97509e36e84f35f4a9b23c
Author:     Richard Cochran <rcochran@...utronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:06 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 14 Jul 2016 09:34:29 +0200

irqchip/hip04: Convert to hotplug state machine

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@...utronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...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/20160713153333.244546182@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/irqchip/irq-hip04.c | 25 +++++--------------------
 include/linux/cpuhotplug.h  |  1 +
 2 files changed, 6 insertions(+), 20 deletions(-)

diff --git a/drivers/irqchip/irq-hip04.c b/drivers/irqchip/irq-hip04.c
index 9e25d8c..021b0e0 100644
--- a/drivers/irqchip/irq-hip04.c
+++ b/drivers/irqchip/irq-hip04.c
@@ -342,26 +342,12 @@ static int hip04_irq_domain_xlate(struct irq_domain *d,
 	return ret;
 }
 
-#ifdef CONFIG_SMP
-static int hip04_irq_secondary_init(struct notifier_block *nfb,
-				    unsigned long action,
-				    void *hcpu)
+static int hip04_irq_starting_cpu(unsigned int cpu)
 {
-	if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
-		hip04_irq_cpu_init(&hip04_data);
-	return NOTIFY_OK;
+	hip04_irq_cpu_init(&hip04_data);
+	return 0;
 }
 
-/*
- * Notifier for enabling the INTC CPU interface. Set an arbitrarily high
- * priority because the GIC needs to be up before the ARM generic timers.
- */
-static struct notifier_block hip04_irq_cpu_notifier = {
-	.notifier_call	= hip04_irq_secondary_init,
-	.priority	= 100,
-};
-#endif
-
 static const struct irq_domain_ops hip04_irq_domain_ops = {
 	.map	= hip04_irq_domain_map,
 	.xlate	= hip04_irq_domain_xlate,
@@ -417,13 +403,12 @@ hip04_of_init(struct device_node *node, struct device_node *parent)
 
 #ifdef CONFIG_SMP
 	set_smp_cross_call(hip04_raise_softirq);
-	register_cpu_notifier(&hip04_irq_cpu_notifier);
 #endif
 	set_handle_irq(hip04_handle_irq);
 
 	hip04_irq_dist_init(&hip04_data);
-	hip04_irq_cpu_init(&hip04_data);
-
+	cpuhp_setup_state(CPUHP_AP_IRQ_HIP04_STARTING, "AP_IRQ_HIP04_STARTING",
+			  hip04_irq_starting_cpu, NULL);
 	return 0;
 }
 IRQCHIP_DECLARE(hip04_intc, "hisilicon,hip04-intc", hip04_of_init);
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index d6e4a06..62ab4ff 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -11,6 +11,7 @@ enum cpuhp_state {
 	CPUHP_AP_SCHED_STARTING,
 	CPUHP_AP_IRQ_GIC_STARTING,
 	CPUHP_AP_IRQ_GICV3_STARTING,
+	CPUHP_AP_IRQ_HIP04_STARTING,
 	CPUHP_AP_NOTIFY_STARTING,
 	CPUHP_AP_ONLINE,
 	CPUHP_TEARDOWN_CPU,