1 files changed, 81 insertions, 2 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 5448aa87fa23..d1e8e8a3fb66 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -68,7 +68,9 @@ enum s390_cpu_state {
 };
 
 DEFINE_MUTEX(smp_cpu_state_mutex);
+int smp_cpu_polarization[NR_CPUS];
 static int smp_cpu_state[NR_CPUS];
+static int cpu_management;
 
 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
@@ -454,6 +456,7 @@ static int smp_rescan_cpus_sigp(cpumask_t avail)
                 if (cpu_known(cpu_id))
                         continue;
                 __cpu_logical_map[logical_cpu] = cpu_id;
+                smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
                 if (!cpu_stopped(logical_cpu))
                         continue;
                 cpu_set(logical_cpu, cpu_present_map);
@@ -487,6 +490,7 @@ static int smp_rescan_cpus_sclp(cpumask_t avail)
                 if (cpu_known(cpu_id))
                         continue;
                 __cpu_logical_map[logical_cpu] = cpu_id;
+                smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
                 cpu_set(logical_cpu, cpu_present_map);
                 if (cpu >= info->configured)
                         smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY;
@@ -844,6 +848,7 @@ void __init smp_prepare_boot_cpu(void)
         S390_lowcore.percpu_offset = __per_cpu_offset[0];
         current_set[0] = current;
         smp_cpu_state[0] = CPU_STATE_CONFIGURED;
+        smp_cpu_polarization[0] = POLARIZATION_UNKNWN;
         spin_lock_init(&(&__get_cpu_var(s390_idle))->lock);
 }
 
@@ -895,15 +900,19 @@ static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
         case 0:
                 if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) {
                         rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]);
-                        if (!rc)
+                        if (!rc) {
                                 smp_cpu_state[cpu] = CPU_STATE_STANDBY;
+                                smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
+                        }
                 }
                 break;
         case 1:
                 if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) {
                         rc = sclp_cpu_configure(__cpu_logical_map[cpu]);
-                        if (!rc)
+                        if (!rc) {
                                 smp_cpu_state[cpu] = CPU_STATE_CONFIGURED;
+                                smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
+                        }
                 }
                 break;
         default:
@@ -917,6 +926,34 @@ out:
 static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
 #endif /* CONFIG_HOTPLUG_CPU */
 
+static ssize_t cpu_polarization_show(struct sys_device *dev, char *buf)
+{
+        int cpu = dev->id;
+        ssize_t count;
+
+        mutex_lock(&smp_cpu_state_mutex);
+        switch (smp_cpu_polarization[cpu]) {
+        case POLARIZATION_HRZ:
+                count = sprintf(buf, "horizontal\n");
+                break;
+        case POLARIZATION_VL:
+                count = sprintf(buf, "vertical:low\n");
+                break;
+        case POLARIZATION_VM:
+                count = sprintf(buf, "vertical:medium\n");
+                break;
+        case POLARIZATION_VH:
+                count = sprintf(buf, "vertical:high\n");
+                break;
+        default:
+                count = sprintf(buf, "unknown\n");
+                break;
+        }
+        mutex_unlock(&smp_cpu_state_mutex);
+        return count;
+}
+static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL);
+
 static ssize_t show_cpu_address(struct sys_device *dev, char *buf)
 {
         return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]);
@@ -929,6 +966,7 @@ static struct attribute *cpu_common_attrs[] = {
         &attr_configure.attr,
 #endif
         &attr_address.attr,
+        &attr_polarization.attr,
         NULL,
 };
 
@@ -1073,11 +1111,48 @@ static ssize_t __ref rescan_store(struct sys_device *dev,
 out:
         put_online_cpus();
         mutex_unlock(&smp_cpu_state_mutex);
+        if (!cpus_empty(newcpus))
+                topology_schedule_update();
         return rc ? rc : count;
 }
 static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store);
 #endif /* CONFIG_HOTPLUG_CPU */
 
+static ssize_t dispatching_show(struct sys_device *dev, char *buf)
+{
+        ssize_t count;
+
+        mutex_lock(&smp_cpu_state_mutex);
+        count = sprintf(buf, "%d\n", cpu_management);
+        mutex_unlock(&smp_cpu_state_mutex);
+        return count;
+}
+
+static ssize_t dispatching_store(struct sys_device *dev, const char *buf,
+                                 size_t count)
+{
+        int val, rc;
+        char delim;
+
+        if (sscanf(buf, "%d %c", &val, &delim) != 1)
+                return -EINVAL;
+        if (val != 0 && val != 1)
+                return -EINVAL;
+        rc = 0;
+        mutex_lock(&smp_cpu_state_mutex);
+        get_online_cpus();
+        if (cpu_management == val)
+                goto out;
+        rc = topology_set_cpu_management(val);
+        if (!rc)
+                cpu_management = val;
+out:
+        put_online_cpus();
+        mutex_unlock(&smp_cpu_state_mutex);
+        return rc ? rc : count;
+}
+static SYSDEV_ATTR(dispatching, 0644, dispatching_show, dispatching_store);
+
 static int __init topology_init(void)
 {
         int cpu;
@@ -1091,6 +1166,10 @@ static int __init topology_init(void)
         if (rc)
                 return rc;
 #endif
+        rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+                               &attr_dispatching.attr);
+        if (rc)
+                return rc;
         for_each_present_cpu(cpu) {
                 rc = smp_add_present_cpu(cpu);
                 if (rc)