linux-kernel - [RFC 10/10] fsl_qman: Add HOTPLUG

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Message-ID: <1423061322-16059-11-git-send-email-Emilian.Medve@Freescale.com>
Date:	Wed, 4 Feb 2015 08:48:42 -0600
From:	Emil Medve <Emilian.Medve@...escale.com>
To:	<devel@...verdev.osuosl.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
CC:	Hai-Ying Wang <Haiying.Wang@...escale.com>
Subject: [RFC 10/10] fsl_qman: Add HOTPLUG_CPU support

From: Hai-Ying Wang <Haiying.Wang@...escale.com>

Change-Id: Ica4d1b2b0fd3c3ae5e043663febd9f4cb7c762cf
Signed-off-by: Hai-Ying Wang <Haiying.Wang@...escale.com>
---
 drivers/staging/fsl_qbman/qman_driver.c | 45 +++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/staging/fsl_qbman/qman_driver.c b/drivers/staging/fsl_qbman/qman_driver.c
index 5ca6221..7cd23bc 100644
--- a/drivers/staging/fsl_qbman/qman_driver.c
+++ b/drivers/staging/fsl_qbman/qman_driver.c
@@ -30,6 +30,9 @@
  */
 
 #include "qman_private.h"
+#ifdef CONFIG_HOTPLUG_CPU
+#include <linux/cpu.h>
+#endif
 
 /* Global variable containing revision id (even on non-control plane systems
  * where CCSR isn't available) */
@@ -381,6 +384,45 @@ static void qman_offline_cpu(unsigned int cpu)
 	}
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
+static void qman_online_cpu(unsigned int cpu)
+{
+	struct qman_portal *p;
+	const struct qm_portal_config *pcfg;
+	p = (struct qman_portal *)affine_portals[cpu];
+	if (p) {
+		pcfg = qman_get_qm_portal_config(p);
+		if (pcfg) {
+			irq_set_affinity(pcfg->public_cfg.irq, cpumask_of(cpu));
+			qman_portal_update_sdest(pcfg, cpu);
+		}
+	}
+}
+
+static int __cpuinit qman_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:
+		qman_online_cpu(cpu);
+		break;
+	case CPU_DOWN_PREPARE:
+	case CPU_DOWN_PREPARE_FROZEN:
+		qman_offline_cpu(cpu);
+	default:
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block qman_hotplug_cpu_notifier = {
+	.notifier_call = qman_hotplug_cpu_callback,
+};
+#endif /* CONFIG_HOTPLUG_CPU */
+
 __init int qman_init(void)
 {
 	struct cpumask slave_cpus;
@@ -499,5 +541,8 @@ __init int qman_init(void)
 	cpumask_andnot(&offline_cpus, cpu_possible_mask, cpu_online_mask);
 	for_each_cpu(cpu, &offline_cpus)
 		qman_offline_cpu(cpu);
+#ifdef CONFIG_HOTPLUG_CPU
+	register_hotcpu_notifier(&qman_hotplug_cpu_notifier);
+#endif
 	return 0;
 }
-- 
2.2.2
--
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