1 files changed, 77 insertions, 0 deletions
diff --git a/kernel/drivers/s390/char/sclp_config.c b/kernel/drivers/s390/char/sclp_config.c
new file mode 100644
index 000000000..944156207
--- /dev/null
+++ b/kernel/drivers/s390/char/sclp_config.c
@@ -0,0 +1,77 @@
+/*
+ *    Copyright IBM Corp. 2007
+ *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ */
+
+#define KMSG_COMPONENT "sclp_config"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/cpu.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+#include <asm/smp.h>
+
+#include "sclp.h"
+
+struct conf_mgm_data {
+	u8 reserved;
+	u8 ev_qualifier;
+} __attribute__((packed));
+
+#define EV_QUAL_CPU_CHANGE	1
+#define EV_QUAL_CAP_CHANGE	3
+
+static struct work_struct sclp_cpu_capability_work;
+static struct work_struct sclp_cpu_change_work;
+
+static void sclp_cpu_capability_notify(struct work_struct *work)
+{
+	int cpu;
+	struct device *dev;
+
+	s390_adjust_jiffies();
+	pr_info("CPU capability may have changed\n");
+	get_online_cpus();
+	for_each_online_cpu(cpu) {
+		dev = get_cpu_device(cpu);
+		kobject_uevent(&dev->kobj, KOBJ_CHANGE);
+	}
+	put_online_cpus();
+}
+
+static void __ref sclp_cpu_change_notify(struct work_struct *work)
+{
+	smp_rescan_cpus();
+}
+
+static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
+{
+	struct conf_mgm_data *cdata;
+
+	cdata = (struct conf_mgm_data *)(evbuf + 1);
+	switch (cdata->ev_qualifier) {
+	case EV_QUAL_CPU_CHANGE:
+		schedule_work(&sclp_cpu_change_work);
+		break;
+	case EV_QUAL_CAP_CHANGE:
+		schedule_work(&sclp_cpu_capability_work);
+		break;
+	}
+}
+
+static struct sclp_register sclp_conf_register =
+{
+	.receive_mask = EVTYP_CONFMGMDATA_MASK,
+	.receiver_fn  = sclp_conf_receiver_fn,
+};
+
+static int __init sclp_conf_init(void)
+{
+	INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
+	INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
+	return sclp_register(&sclp_conf_register);
+}
+
+__initcall(sclp_conf_init);