[S390] Automatically detect added cpus.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 6bb5c05..0aeb290 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -505,7 +505,7 @@ out:
        return rc;
 }
 
-static int smp_rescan_cpus(void)
+static int __smp_rescan_cpus(void)
 {
        cpumask_t avail;
 
@@ -570,7 +570,7 @@ out:
        kfree(info);
        printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus);
        get_online_cpus();
-       smp_rescan_cpus();
+       __smp_rescan_cpus();
        put_online_cpus();
 }
 
@@ -1088,8 +1088,8 @@ out:
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-static ssize_t __ref rescan_store(struct sys_device *dev,
-                                 const char *buf, size_t count)
+
+int smp_rescan_cpus(void)
 {
        cpumask_t newcpus;
        int cpu;
@@ -1098,7 +1098,7 @@ static ssize_t __ref rescan_store(struct sys_device *dev,
        get_online_cpus();
        mutex_lock(&smp_cpu_state_mutex);
        newcpus = cpu_present_map;
-       rc = smp_rescan_cpus();
+       rc = __smp_rescan_cpus();
        if (rc)
                goto out;
        cpus_andnot(newcpus, cpu_present_map, newcpus);
@@ -1113,6 +1113,15 @@ out:
        put_online_cpus();
        if (!cpus_empty(newcpus))
                topology_schedule_update();
+       return rc;
+}
+
+static ssize_t __ref rescan_store(struct sys_device *dev, const char *buf,
+                                 size_t count)
+{
+       int rc;
+
+       rc = smp_rescan_cpus();
        return rc ? rc : count;
 }
 static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store);

diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
index b8f35bc..9e784d5 100644 (file)
--- a/drivers/s390/char/sclp_config.c
+++ b/drivers/s390/char/sclp_config.c
@@ -10,6 +10,7 @@
 #include <linux/cpu.h>
 #include <linux/sysdev.h>
 #include <linux/workqueue.h>
+#include <asm/smp.h>
 #include "sclp.h"
 
 #define TAG    "sclp_config: "
@@ -19,9 +20,11 @@ struct conf_mgm_data {
        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)
 {
@@ -37,13 +40,24 @@ static void sclp_cpu_capability_notify(struct work_struct *work)
        put_online_cpus();
 }
 
+static void 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);
-       if (cdata->ev_qualifier == EV_QUAL_CAP_CHANGE)
+       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 =
@@ -57,6 +71,7 @@ static int __init sclp_conf_init(void)
        int rc;
 
        INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
+       INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
 
        rc = sclp_register(&sclp_conf_register);
        if (rc) {

diff --git a/include/asm-s390/smp.h b/include/asm-s390/smp.h
index 6f3821a..8376b19 100644 (file)
--- a/include/asm-s390/smp.h
+++ b/include/asm-s390/smp.h
@@ -108,5 +108,11 @@ static inline void smp_send_stop(void)
 #define smp_cpu_not_running(cpu)       1
 #endif
 
+#ifdef CONFIG_HOTPLUG_CPU
+extern int smp_rescan_cpus(void);
+#else
+static inline int smp_rescan_cpus(void) { return 0; }
+#endif
+
 extern union save_area *zfcpdump_save_areas[NR_CPUS + 1];
 #endif