Initial import

1 files changed, 294 insertions, 0 deletions

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
new file mode 100644
index 000000000..c0fb6b1b4
--- /dev/null
+++ b/include/linux/cpu.h
@@ -0,0 +1,294 @@
+/*
+ * 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
+ *
+ * CPUs are exported via sysfs in the devices/system/cpu
+ * directory. 
+ */
+#ifndef _LINUX_CPU_H_
+#define _LINUX_CPU_H_
+
+#include <linux/node.h>
+#include <linux/compiler.h>
+#include <linux/cpumask.h>
+
+struct device;
+struct device_node;
+struct attribute_group;
+
+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 bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
+extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
+					      int cpu, unsigned int *thread);
+
+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 struct device *cpu_device_create(struct device *parent, void *drvdata,
+					const struct attribute_group **groups,
+					const char *fmt, ...);
+#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,
+	CPU_PRI_SMPBOOT		= 9,
+	/* bring up workqueues before normal notifiers and down after */
+	CPU_PRI_WORKQUEUE_UP	= 5,
+	CPU_PRI_WORKQUEUE_DOWN	= -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 */
+#define CPU_DYING_IDLE		0x000B /* CPU (unsigned)v dying, reached
+					* idle loop. */
+#define CPU_BROKEN		0x000C /* CPU (unsigned)v did not die properly,
+					* perhaps due to preemption. */
+
+/* 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 =			\
+		{ .notifier_call = fn, .priority = pri };	\
+	register_cpu_notifier(&fn##_nb);			\
+}
+
+#define __cpu_notifier(fn, pri) {				\
+	static struct notifier_block fn##_nb =			\
+		{ .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)
+#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 int __register_cpu_notifier(struct notifier_block *nb);
+extern void unregister_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);
+extern int __register_cpu_notifier(struct notifier_block *nb);
+#else
+static inline int register_cpu_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+
+static inline int __register_cpu_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+#endif
+
+static inline void unregister_cpu_notifier(struct notifier_block *nb)
+{
+}
+
+static inline void __unregister_cpu_notifier(struct notifier_block *nb)
+{
+}
+#endif
+
+void smpboot_thread_init(void);
+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);
+
+#define cpu_notifier_register_begin	cpu_maps_update_begin
+#define cpu_notifier_register_done	cpu_maps_update_done
+
+#else	/* CONFIG_SMP */
+
+#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
+#define __cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
+
+static inline int register_cpu_notifier(struct notifier_block *nb)
+{
+	return 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 __unregister_cpu_notifier(struct notifier_block *nb)
+{
+}
+
+static inline void cpu_maps_update_begin(void)
+{
+}
+
+static inline void cpu_maps_update_done(void)
+{
+}
+
+static inline void cpu_notifier_register_begin(void)
+{
+}
+
+static inline void cpu_notifier_register_done(void)
+{
+}
+
+static inline void smpboot_thread_init(void)
+{
+}
+
+#endif /* CONFIG_SMP */
+extern struct bus_type cpu_subsys;
+
+#ifdef CONFIG_HOTPLUG_CPU
+/* Stop CPUs going up and down. */
+
+extern void cpu_hotplug_begin(void);
+extern void cpu_hotplug_done(void);
+extern void get_online_cpus(void);
+extern bool try_get_online_cpus(void);
+extern void put_online_cpus(void);
+extern void cpu_hotplug_disable(void);
+extern void cpu_hotplug_enable(void);
+#define hotcpu_notifier(fn, pri)	cpu_notifier(fn, pri)
+#define __hotcpu_notifier(fn, pri)	__cpu_notifier(fn, pri)
+#define register_hotcpu_notifier(nb)	register_cpu_notifier(nb)
+#define __register_hotcpu_notifier(nb)	__register_cpu_notifier(nb)
+#define unregister_hotcpu_notifier(nb)	unregister_cpu_notifier(nb)
+#define __unregister_hotcpu_notifier(nb)	__unregister_cpu_notifier(nb)
+void clear_tasks_mm_cpumask(int cpu);
+int cpu_down(unsigned int cpu);
+
+#else		/* CONFIG_HOTPLUG_CPU */
+
+static inline void cpu_hotplug_begin(void) {}
+static inline void cpu_hotplug_done(void) {}
+#define get_online_cpus()	do { } while (0)
+#define try_get_online_cpus()	true
+#define put_online_cpus()	do { } while (0)
+#define cpu_hotplug_disable()	do { } while (0)
+#define cpu_hotplug_enable()	do { } while (0)
+#define hotcpu_notifier(fn, pri)	do { (void)(fn); } 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 __register_hotcpu_notifier(nb)	({ (void)(nb); 0; })
+#define unregister_hotcpu_notifier(nb)	({ (void)(nb); })
+#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 */
+
+enum cpuhp_state {
+	CPUHP_OFFLINE,
+	CPUHP_ONLINE,
+};
+
+void cpu_startup_entry(enum cpuhp_state state);
+
+void cpu_idle_poll_ctrl(bool enable);
+
+void arch_cpu_idle(void);
+void arch_cpu_idle_prepare(void);
+void arch_cpu_idle_enter(void);
+void arch_cpu_idle_exit(void);
+void arch_cpu_idle_dead(void);
+
+DECLARE_PER_CPU(bool, cpu_dead_idle);
+
+int cpu_report_state(int cpu);
+int cpu_check_up_prepare(int cpu);
+void cpu_set_state_online(int cpu);
+#ifdef CONFIG_HOTPLUG_CPU
+bool cpu_wait_death(unsigned int cpu, int seconds);
+bool cpu_report_death(void);
+#endif /* #ifdef CONFIG_HOTPLUG_CPU */
+
+#endif /* _LINUX_CPU_H_ */