linux-kernel - [tip:smp/hotplug] soc/fsl/qbman: Convert to hotplug state machine

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Date:   Thu, 1 Dec 2016 16:16:53 -0800
From:   tip-bot for Sebastian Andrzej Siewior <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, oss@...error.net, mingo@...nel.org,
        roy.pledge@....com, tglx@...utronix.de, claudiu.manoil@....com,
        bigeasy@...utronix.de, linux-kernel@...r.kernel.org
Subject: [tip:smp/hotplug] soc/fsl/qbman: Convert to hotplug state machine

Commit-ID:  fce77c3562eccdd8002c9c7947f00af70e00a375
Gitweb:     http://git.kernel.org/tip/fce77c3562eccdd8002c9c7947f00af70e00a375
Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate: Sun, 27 Nov 2016 00:13:47 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 2 Dec 2016 00:52:39 +0100

soc/fsl/qbman: Convert to hotplug state machine

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Scott Wood <oss@...error.net>
Cc: Claudiu Manoil <claudiu.manoil@....com>
Cc: rt@...utronix.de
Cc: Roy Pledge <roy.pledge@....com>
Link: http://lkml.kernel.org/r/20161126231350.10321-20-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 drivers/soc/fsl/qbman/bman_portal.c | 46 +++++++++++++------------------------
 1 file changed, 16 insertions(+), 30 deletions(-)

diff --git a/drivers/soc/fsl/qbman/bman_portal.c b/drivers/soc/fsl/qbman/bman_portal.c
index 6579cc1..986f646 100644
--- a/drivers/soc/fsl/qbman/bman_portal.c
+++ b/drivers/soc/fsl/qbman/bman_portal.c
@@ -53,58 +53,38 @@ static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)
 	return p;
 }
 
-static void bman_offline_cpu(unsigned int cpu)
+static int bman_offline_cpu(unsigned int cpu)
 {
 	struct bman_portal *p = affine_bportals[cpu];
 	const struct bm_portal_config *pcfg;
 
 	if (!p)
-		return;
+		return 0;
 
 	pcfg = bman_get_bm_portal_config(p);
 	if (!pcfg)
-		return;
+		return 0;
 
 	irq_set_affinity(pcfg->irq, cpumask_of(0));
+	return 0;
 }
 
-static void bman_online_cpu(unsigned int cpu)
+static int bman_online_cpu(unsigned int cpu)
 {
 	struct bman_portal *p = affine_bportals[cpu];
 	const struct bm_portal_config *pcfg;
 
 	if (!p)
-		return;
+		return 0;
 
 	pcfg = bman_get_bm_portal_config(p);
 	if (!pcfg)
-		return;
+		return 0;
 
 	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
+	return 0;
 }
 
-static int bman_hotplug_cpu_callback(struct notifier_block *nfb,
-				     unsigned long action, void *hcpu)
-{
-	unsigned int cpu = (unsigned long)hcpu;
-
-	switch (action) {
-	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
-		bman_online_cpu(cpu);
-		break;
-	case CPU_DOWN_PREPARE:
-	case CPU_DOWN_PREPARE_FROZEN:
-		bman_offline_cpu(cpu);
-	}
-
-	return NOTIFY_OK;
-}
-
-static struct notifier_block bman_hotplug_cpu_notifier = {
-	.notifier_call = bman_hotplug_cpu_callback,
-};
-
 static int bman_portal_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -210,8 +190,14 @@ static int __init bman_portal_driver_register(struct platform_driver *drv)
 	if (ret < 0)
 		return ret;
 
-	register_hotcpu_notifier(&bman_hotplug_cpu_notifier);
-
+	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
+					"soc/qbman_portal:online",
+					bman_online_cpu, bman_offline_cpu);
+	if (ret < 0) {
+		pr_err("bman: failed to register hotplug callbacks.\n");
+		platform_driver_unregister(drv);
+		return ret;
+	}
 	return 0;
 }