mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
183912d352
This patch moves the generalized implementation of of_get_cpu_node from PowerPC to DT core library, thereby adding support for retrieving cpu node for a given logical cpu index on any architecture. The CPU subsystem can now use this function to assign of_node in the cpu device while registering CPUs. It is recommended to use these helper function only in pre-SMP/early initialisation stages to retrieve CPU device node pointers in logical ordering. Once the cpu devices are registered, it can be retrieved easily from cpu device of_node which avoids unnecessary parsing and matching. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Grant Likely <grant.likely@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
235 lines
7.1 KiB
C
235 lines
7.1 KiB
C
/*
|
|
* 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 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 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);
|
|
|
|
#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;
|
|
|
|
#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
|
|
extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env);
|
|
extern ssize_t arch_print_cpu_modalias(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *bufptr);
|
|
#endif
|
|
|
|
/*
|
|
* 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,
|
|
/* 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 */
|
|
|
|
/* 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); \
|
|
}
|
|
#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);
|
|
extern void cpu_hotplug_disable(void);
|
|
extern void cpu_hotplug_enable(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)
|
|
void clear_tasks_mm_cpumask(int cpu);
|
|
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 cpu_hotplug_disable() do { } while (0)
|
|
#define cpu_hotplug_enable() 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 */
|
|
|
|
enum cpuhp_state {
|
|
CPUHP_OFFLINE,
|
|
CPUHP_ONLINE,
|
|
};
|
|
|
|
void cpu_startup_entry(enum cpuhp_state state);
|
|
void cpu_idle(void);
|
|
|
|
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);
|
|
|
|
#endif /* _LINUX_CPU_H_ */
|