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path: root/drivers/s390/char/sclp_config.c
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Diffstat (limited to 'drivers/s390/char/sclp_config.c')
-rw-r--r--drivers/s390/char/sclp_config.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
new file mode 100644
index 000000000..944156207
--- /dev/null
+++ b/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);