regcache: Make sure we sync register 0 in an rbtree cache
[linux-2.6.git] / drivers / base / cpu.c
index 1f745f1..251acea 100644 (file)
 #include <linux/topology.h>
 #include <linux/device.h>
 #include <linux/node.h>
+#include <linux/gfp.h>
 
 #include "base.h"
 
+static struct sysdev_class_attribute *cpu_sysdev_class_attrs[];
+
 struct sysdev_class cpu_sysdev_class = {
-       set_kset_name("cpu"),
+       .name = "cpu",
+       .attrs = cpu_sysdev_class_attrs,
 };
 EXPORT_SYMBOL(cpu_sysdev_class);
 
-static struct sys_device *cpu_sys_devices[NR_CPUS];
+static DEFINE_PER_CPU(struct sys_device *, cpu_sys_devices);
 
 #ifdef CONFIG_HOTPLUG_CPU
-static ssize_t show_online(struct sys_device *dev, char *buf)
+static ssize_t show_online(struct sys_device *dev, struct sysdev_attribute *attr,
+                          char *buf)
 {
        struct cpu *cpu = container_of(dev, struct cpu, sysdev);
 
        return sprintf(buf, "%u\n", !!cpu_online(cpu->sysdev.id));
 }
 
-static ssize_t store_online(struct sys_device *dev, const char *buf,
-                           size_t count)
+static ssize_t __ref store_online(struct sys_device *dev, struct sysdev_attribute *attr,
+                                const char *buf, size_t count)
 {
        struct cpu *cpu = container_of(dev, struct cpu, sysdev);
        ssize_t ret;
 
+       cpu_hotplug_driver_lock();
        switch (buf[0]) {
        case '0':
                ret = cpu_down(cpu->sysdev.id);
@@ -48,14 +54,15 @@ static ssize_t store_online(struct sys_device *dev, const char *buf,
        default:
                ret = -EINVAL;
        }
+       cpu_hotplug_driver_unlock();
 
        if (ret >= 0)
                ret = count;
        return ret;
 }
-static SYSDEV_ATTR(online, 0600, show_online, store_online);
+static SYSDEV_ATTR(online, 0644, show_online, store_online);
 
-static void __devinit register_cpu_control(struct cpu *cpu)
+static void __cpuinit register_cpu_control(struct cpu *cpu)
 {
        sysdev_create_file(&cpu->sysdev, &attr_online);
 }
@@ -68,9 +75,31 @@ void unregister_cpu(struct cpu *cpu)
        sysdev_remove_file(&cpu->sysdev, &attr_online);
 
        sysdev_unregister(&cpu->sysdev);
-       cpu_sys_devices[logical_cpu] = NULL;
+       per_cpu(cpu_sys_devices, logical_cpu) = NULL;
        return;
 }
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+static ssize_t cpu_probe_store(struct sysdev_class *class,
+                              struct sysdev_class_attribute *attr,
+                              const char *buf,
+                              size_t count)
+{
+       return arch_cpu_probe(buf, count);
+}
+
+static ssize_t cpu_release_store(struct sysdev_class *class,
+                                struct sysdev_class_attribute *attr,
+                                const char *buf,
+                                size_t count)
+{
+       return arch_cpu_release(buf, count);
+}
+
+static SYSDEV_CLASS_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
+static SYSDEV_CLASS_ATTR(release, S_IWUSR, NULL, cpu_release_store);
+#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
+
 #else /* ... !CONFIG_HOTPLUG_CPU */
 static inline void register_cpu_control(struct cpu *cpu)
 {
@@ -80,7 +109,8 @@ static inline void register_cpu_control(struct cpu *cpu)
 #ifdef CONFIG_KEXEC
 #include <linux/kexec.h>
 
-static ssize_t show_crash_notes(struct sys_device *dev, char *buf)
+static ssize_t show_crash_notes(struct sys_device *dev, struct sysdev_attribute *attr,
+                               char *buf)
 {
        struct cpu *cpu = container_of(dev, struct cpu, sysdev);
        ssize_t rc;
@@ -95,7 +125,7 @@ static ssize_t show_crash_notes(struct sys_device *dev, char *buf)
         * boot up and this data does not change there after. Hence this
         * operation should be safe. No locking required.
         */
-       addr = __pa(per_cpu_ptr(crash_notes, cpunum));
+       addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
        rc = sprintf(buf, "%Lx\n", addr);
        return rc;
 }
@@ -103,14 +133,89 @@ static SYSDEV_ATTR(crash_notes, 0400, show_crash_notes, NULL);
 #endif
 
 /*
- * register_cpu - Setup a driverfs device for a CPU.
- * @cpu - Callers can set the cpu->no_control field to 1, to indicate not to
- *               generate a control file in sysfs for this CPU.
+ * Print cpu online, possible, present, and system maps
+ */
+
+struct cpu_attr {
+       struct sysdev_class_attribute attr;
+       const struct cpumask *const * const map;
+};
+
+static ssize_t show_cpus_attr(struct sysdev_class *class,
+                             struct sysdev_class_attribute *attr,
+                             char *buf)
+{
+       struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
+       int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map));
+
+       buf[n++] = '\n';
+       buf[n] = '\0';
+       return n;
+}
+
+#define _CPU_ATTR(name, map)                                           \
+       { _SYSDEV_CLASS_ATTR(name, 0444, show_cpus_attr, NULL), map }
+
+/* Keep in sync with cpu_sysdev_class_attrs */
+static struct cpu_attr cpu_attrs[] = {
+       _CPU_ATTR(online, &cpu_online_mask),
+       _CPU_ATTR(possible, &cpu_possible_mask),
+       _CPU_ATTR(present, &cpu_present_mask),
+};
+
+/*
+ * Print values for NR_CPUS and offlined cpus
+ */
+static ssize_t print_cpus_kernel_max(struct sysdev_class *class,
+                                    struct sysdev_class_attribute *attr, char *buf)
+{
+       int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
+       return n;
+}
+static SYSDEV_CLASS_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
+
+/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
+unsigned int total_cpus;
+
+static ssize_t print_cpus_offline(struct sysdev_class *class,
+                                 struct sysdev_class_attribute *attr, char *buf)
+{
+       int n = 0, len = PAGE_SIZE-2;
+       cpumask_var_t offline;
+
+       /* display offline cpus < nr_cpu_ids */
+       if (!alloc_cpumask_var(&offline, GFP_KERNEL))
+               return -ENOMEM;
+       cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
+       n = cpulist_scnprintf(buf, len, offline);
+       free_cpumask_var(offline);
+
+       /* display offline cpus >= nr_cpu_ids */
+       if (total_cpus && nr_cpu_ids < total_cpus) {
+               if (n && n < len)
+                       buf[n++] = ',';
+
+               if (nr_cpu_ids == total_cpus-1)
+                       n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
+               else
+                       n += snprintf(&buf[n], len - n, "%d-%d",
+                                                     nr_cpu_ids, total_cpus-1);
+       }
+
+       n += snprintf(&buf[n], len - n, "\n");
+       return n;
+}
+static SYSDEV_CLASS_ATTR(offline, 0444, print_cpus_offline, NULL);
+
+/*
+ * register_cpu - Setup a sysfs device for a CPU.
+ * @cpu - cpu->hotpluggable field set to 1 will generate a control file in
+ *       sysfs for this CPU.
  * @num - CPU number to use when creating the device.
  *
  * Initialize and register the CPU device.
  */
-int __devinit register_cpu(struct cpu *cpu, int num)
+int __cpuinit register_cpu(struct cpu *cpu, int num)
 {
        int error;
        cpu->node_id = cpu_to_node(num);
@@ -119,10 +224,10 @@ int __devinit register_cpu(struct cpu *cpu, int num)
 
        error = sysdev_register(&cpu->sysdev);
 
-       if (!error && !cpu->no_control)
+       if (!error && cpu->hotpluggable)
                register_cpu_control(cpu);
        if (!error)
-               cpu_sys_devices[num] = &cpu->sysdev;
+               per_cpu(cpu_sys_devices, num) = &cpu->sysdev;
        if (!error)
                register_cpu_under_node(num, cpu_to_node(num));
 
@@ -135,8 +240,8 @@ int __devinit register_cpu(struct cpu *cpu, int num)
 
 struct sys_device *get_cpu_sysdev(unsigned cpu)
 {
-       if (cpu < NR_CPUS)
-               return cpu_sys_devices[cpu];
+       if (cpu < nr_cpu_ids && cpu_possible(cpu))
+               return per_cpu(cpu_sys_devices, cpu);
        else
                return NULL;
 }
@@ -154,3 +259,16 @@ int __init cpu_dev_init(void)
 
        return err;
 }
+
+static struct sysdev_class_attribute *cpu_sysdev_class_attrs[] = {
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+       &attr_probe,
+       &attr_release,
+#endif
+       &cpu_attrs[0].attr,
+       &cpu_attrs[1].attr,
+       &cpu_attrs[2].attr,
+       &attr_kernel_max,
+       &attr_offline,
+       NULL
+};