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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-04-30 11:38:37 (GMT)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-04-30 11:38:44 (GMT)
commit1e489518da2a49604df2c3281034097274324be9 (patch)
treef0a6e5b9a19d2d3f8aef4ba1ad3a762e01d4e67a
parent0b18d318b80a7f350648ca8f7cc00a2f688104cb (diff)
downloadlinux-1e489518da2a49604df2c3281034097274324be9.tar.xz
[S390] Automatically detect added cpus.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/kernel/smp.c19
-rw-r--r--drivers/s390/char/sclp_config.c17
-rw-r--r--include/asm-s390/smp.h6
3 files changed, 36 insertions, 6 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 6bb5c05..0aeb290 100644
--- 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
--- 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
--- 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