[S390] Processor degradation notification.

Generate uevents for all cpus if cpu capability changes. This can
happen e.g. because the cpus are overheating. The cpu capability can
be read via /sys/devices/system/cpu/cpuN/capability.

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

6 files changed, 140 insertions, 6 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 7c0143fdf710..2c5de92958dd 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -821,19 +821,57 @@ int setup_profiling_timer(unsigned int multiplier)
 
 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 
+static ssize_t show_capability(struct sys_device *dev, char *buf)
+{
+        unsigned int capability;
+        int rc;
+
+        rc = get_cpu_capability(&capability);
+        if (rc)
+                return rc;
+        return sprintf(buf, "%u\n", capability);
+}
+static SYSDEV_ATTR(capability, 0444, show_capability, NULL);
+
+static int __cpuinit smp_cpu_notify(struct notifier_block *self,
+                                    unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (unsigned int)(long)hcpu;
+        struct cpu *c = &per_cpu(cpu_devices, cpu);
+        struct sys_device *s = &c->sysdev;
+
+        switch (action) {
+        case CPU_ONLINE:
+                if (sysdev_create_file(s, &attr_capability))
+                        return NOTIFY_BAD;
+                break;
+        case CPU_DEAD:
+                sysdev_remove_file(s, &attr_capability);
+                break;
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata smp_cpu_nb = {
+        .notifier_call  = smp_cpu_notify,
+};
+
 static int __init topology_init(void)
 {
         int cpu;
-        int ret;
+
+        register_cpu_notifier(&smp_cpu_nb);
 
         for_each_possible_cpu(cpu) {
                 struct cpu *c = &per_cpu(cpu_devices, cpu);
+                struct sys_device *s = &c->sysdev;
 
                 c->hotpluggable = 1;
-                ret = register_cpu(c, cpu);
-                if (ret)
-                        printk(KERN_WARNING "topology_init: register_cpu %d "
-                               "failed (%d)\n", cpu, ret);
+                register_cpu(c, cpu);
+                if (!cpu_online(cpu))
+                        continue;
+                s = &c->sysdev;
+                sysdev_create_file(s, &attr_capability);
         }
         return 0;
 }
diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index a0f6db21855a..c210784bdf46 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -3,7 +3,7 @@
 #
 
 obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
-         sclp_info.o sclp_chp.o
+         sclp_info.o sclp_config.o sclp_chp.o
 
 obj-$(CONFIG_TN3270) += raw3270.o
 obj-$(CONFIG_TN3270_CONSOLE) += con3270.o
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index e03dcf4c5fca..87ac4a3ad49d 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -27,6 +27,7 @@
 #define EVTYP_CNTLPROGIDENT     0x0B
 #define EVTYP_SIGQUIESCE        0x1D
 #define EVTYP_VT220MSG          0x1A
+#define EVTYP_CONFMGMDATA       0x04
 #define EVTYP_SDIAS             0x1C
 
 #define EVTYP_OPCMD_MASK        0x80000000
@@ -37,6 +38,7 @@
 #define EVTYP_CTLPROGIDENT_MASK 0x00200000
 #define EVTYP_SIGQUIESCE_MASK   0x00000008
 #define EVTYP_VT220MSG_MASK     0x00000040
+#define EVTYP_CONFMGMDATA_MASK  0x10000000
 #define EVTYP_SDIAS_MASK        0x00000010
 
 #define GNRLMSGFLGS_DOM         0x8000
diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
new file mode 100644
index 000000000000..5322e5e54a98
--- /dev/null
+++ b/drivers/s390/char/sclp_config.c
@@ -0,0 +1,75 @@
+/*
+ *  drivers/s390/char/sclp_config.c
+ *
+ *    Copyright IBM Corp. 2007
+ *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ */
+
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/cpu.h>
+#include <linux/sysdev.h>
+#include <linux/workqueue.h>
+#include "sclp.h"
+
+#define TAG     "sclp_config: "
+
+struct conf_mgm_data {
+        u8 reserved;
+        u8 ev_qualifier;
+} __attribute__((packed));
+
+#define EV_QUAL_CAP_CHANGE      3
+
+static struct work_struct sclp_cpu_capability_work;
+
+static void sclp_cpu_capability_notify(struct work_struct *work)
+{
+        int cpu;
+        struct sys_device *sysdev;
+
+        printk(KERN_WARNING TAG "cpu capability changed.\n");
+        lock_cpu_hotplug();
+        for_each_online_cpu(cpu) {
+                sysdev = get_cpu_sysdev(cpu);
+                kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
+        }
+        unlock_cpu_hotplug();
+}
+
+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)
+                schedule_work(&sclp_cpu_capability_work);
+}
+
+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)
+{
+        int rc;
+
+        INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
+
+        rc = sclp_register(&sclp_conf_register);
+        if (rc) {
+                printk(KERN_ERR TAG "failed to register (%d).\n", rc);
+                return rc;
+        }
+
+        if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK)) {
+                printk(KERN_WARNING TAG "no configuration management.\n");
+                sclp_unregister(&sclp_conf_register);
+                rc = -ENOSYS;
+        }
+        return rc;
+}
+
+__initcall(sclp_conf_init);
diff --git a/drivers/s390/sysinfo.c b/drivers/s390/sysinfo.c
index 090743d2f914..19343f9675c3 100644
--- a/drivers/s390/sysinfo.c
+++ b/drivers/s390/sysinfo.c
@@ -357,6 +357,24 @@ static __init int create_proc_sysinfo(void)
 
 __initcall(create_proc_sysinfo);
 
+int get_cpu_capability(unsigned int *capability)
+{
+        struct sysinfo_1_2_2 *info;
+        int rc;
+
+        info = (void *) get_zeroed_page(GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+        rc = stsi(info, 1, 2, 2);
+        if (rc == -ENOSYS)
+                goto out;
+        rc = 0;
+        *capability = info->capability;
+out:
+        free_page((unsigned long) info);
+        return rc;
+}
+
 /*
  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
  */
diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index 96a6f80953a9..e0fcea8c64c3 100644
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -57,6 +57,7 @@ struct cpuinfo_S390
 
 extern void s390_adjust_jiffies(void);
 extern void print_cpu_info(struct cpuinfo_S390 *);
+extern int get_cpu_capability(unsigned int *);
 
 /* Lazy FPU handling on uni-processor */
 extern struct task_struct *last_task_used_math;