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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /include/linux/cpu.h
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'include/linux/cpu.h')
-rw-r--r--include/linux/cpu.h207
1 files changed, 207 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
new file mode 100644
index 00000000000..1f6587590a1
--- /dev/null
+++ b/include/linux/cpu.h
@@ -0,0 +1,207 @@
+/*
+ * include/linux/cpu.h - generic cpu definition
+ *
+ * This is mainly for topological representation. We define the
+ * basic 'struct cpu' here, which can be embedded in per-arch
+ * definitions of processors.
+ *
+ * Basic handling of the devices is done in drivers/base/cpu.c
+ * and system devices are handled in drivers/base/sys.c.
+ *
+ * CPUs are exported via sysfs in the class/cpu/devices/
+ * directory.
+ */
+#ifndef _LINUX_CPU_H_
+#define _LINUX_CPU_H_
+
+#include <linux/device.h>
+#include <linux/node.h>
+#include <linux/compiler.h>
+#include <linux/cpumask.h>
+
+struct cpu {
+ int node_id; /* The node which contains the CPU */
+ int hotpluggable; /* creates sysfs control file if hotpluggable */
+ struct device dev;
+};
+
+extern int register_cpu(struct cpu *cpu, int num);
+extern struct device *get_cpu_device(unsigned cpu);
+extern bool cpu_is_hotpluggable(unsigned cpu);
+
+extern int cpu_add_dev_attr(struct device_attribute *attr);
+extern void cpu_remove_dev_attr(struct device_attribute *attr);
+
+extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
+extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
+
+extern int sched_create_sysfs_power_savings_entries(struct device *dev);
+
+#ifdef CONFIG_HOTPLUG_CPU
+extern void unregister_cpu(struct cpu *cpu);
+extern ssize_t arch_cpu_probe(const char *, size_t);
+extern ssize_t arch_cpu_release(const char *, size_t);
+#endif
+struct notifier_block;
+
+/*
+ * CPU notifier priorities.
+ */
+enum {
+ /*
+ * SCHED_ACTIVE marks a cpu which is coming up active during
+ * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
+ * notifier. CPUSET_ACTIVE adjusts cpuset according to
+ * cpu_active mask right after SCHED_ACTIVE. During
+ * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
+ * ordered in the similar way.
+ *
+ * This ordering guarantees consistent cpu_active mask and
+ * migration behavior to all cpu notifiers.
+ */
+ CPU_PRI_SCHED_ACTIVE = INT_MAX,
+ CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
+ CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
+ CPU_PRI_CPUSET_INACTIVE = INT_MIN,
+
+ /* migration should happen before other stuff but after perf */
+ CPU_PRI_PERF = 20,
+ CPU_PRI_MIGRATION = 10,
+ /* prepare workqueues for other notifiers */
+ CPU_PRI_WORKQUEUE = 5,
+};
+
+#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
+#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
+#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
+#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
+#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
+#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
+#define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
+ * not handling interrupts, soon dead.
+ * Called on the dying cpu, interrupts
+ * are already disabled. Must not
+ * sleep, must not fail */
+#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
+ * lock is dropped */
+#define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
+ * Called on the new cpu, just before
+ * enabling interrupts. Must not sleep,
+ * must not fail */
+
+/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
+ * operation in progress
+ */
+#define CPU_TASKS_FROZEN 0x0010
+
+#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
+#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
+#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
+#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
+#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
+#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
+#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
+#define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
+
+
+#ifdef CONFIG_SMP
+/* Need to know about CPUs going up/down? */
+#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
+#define cpu_notifier(fn, pri) { \
+ static struct notifier_block fn##_nb __cpuinitdata = \
+ { .notifier_call = fn, .priority = pri }; \
+ register_cpu_notifier(&fn##_nb); \
+}
+#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
+#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
+#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
+#ifdef CONFIG_HOTPLUG_CPU
+extern int register_cpu_notifier(struct notifier_block *nb);
+extern void unregister_cpu_notifier(struct notifier_block *nb);
+#else
+
+#ifndef MODULE
+extern int register_cpu_notifier(struct notifier_block *nb);
+#else
+static inline int register_cpu_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+#endif
+
+static inline void unregister_cpu_notifier(struct notifier_block *nb)
+{
+}
+#endif
+
+int cpu_up(unsigned int cpu);
+void notify_cpu_starting(unsigned int cpu);
+extern void cpu_maps_update_begin(void);
+extern void cpu_maps_update_done(void);
+
+#else /* CONFIG_SMP */
+
+#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
+
+static inline int register_cpu_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline void unregister_cpu_notifier(struct notifier_block *nb)
+{
+}
+
+static inline void cpu_maps_update_begin(void)
+{
+}
+
+static inline void cpu_maps_update_done(void)
+{
+}
+
+#endif /* CONFIG_SMP */
+extern struct bus_type cpu_subsys;
+
+#ifdef CONFIG_HOTPLUG_CPU
+/* Stop CPUs going up and down. */
+
+extern void get_online_cpus(void);
+extern void put_online_cpus(void);
+#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
+#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
+#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
+int cpu_down(unsigned int cpu);
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+extern void cpu_hotplug_driver_lock(void);
+extern void cpu_hotplug_driver_unlock(void);
+#else
+static inline void cpu_hotplug_driver_lock(void)
+{
+}
+
+static inline void cpu_hotplug_driver_unlock(void)
+{
+}
+#endif
+
+#else /* CONFIG_HOTPLUG_CPU */
+
+#define get_online_cpus() do { } while (0)
+#define put_online_cpus() do { } while (0)
+#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
+/* These aren't inline functions due to a GCC bug. */
+#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
+#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
+#endif /* CONFIG_HOTPLUG_CPU */
+
+#ifdef CONFIG_PM_SLEEP_SMP
+extern int disable_nonboot_cpus(void);
+extern void enable_nonboot_cpus(void);
+#else /* !CONFIG_PM_SLEEP_SMP */
+static inline int disable_nonboot_cpus(void) { return 0; }
+static inline void enable_nonboot_cpus(void) {}
+#endif /* !CONFIG_PM_SLEEP_SMP */
+
+#endif /* _LINUX_CPU_H_ */