mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 20:26:46 +07:00
e545a6140b
Right now, there is no notifier that is called on a new cpu, before the new cpu begins processing interrupts/softirqs. Various kernel function would need that notification, e.g. kvm works around by calling smp_call_function_single(), rcu polls cpu_online_map. The patch adds a CPU_STARTING notification. It also adds a helper function that sends the message to all cpu_chain handlers. Tested on x86-64. All other archs are untested. Especially on sparc, I'm not sure if I got it right. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
155 lines
4.1 KiB
C
155 lines
4.1 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
|
|
* and system devices are handled in drivers/base/sys.c.
|
|
*
|
|
* CPUs are exported via sysfs in the class/cpu/devices/
|
|
* directory.
|
|
*
|
|
* Per-cpu interfaces can be implemented using a struct device_interface.
|
|
* See the following for how to do this:
|
|
* - drivers/base/intf.c
|
|
* - Documentation/driver-model/interface.txt
|
|
*/
|
|
#ifndef _LINUX_CPU_H_
|
|
#define _LINUX_CPU_H_
|
|
|
|
#include <linux/sysdev.h>
|
|
#include <linux/node.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/mutex.h>
|
|
|
|
struct cpu {
|
|
int node_id; /* The node which contains the CPU */
|
|
int hotpluggable; /* creates sysfs control file if hotpluggable */
|
|
struct sys_device sysdev;
|
|
};
|
|
|
|
extern int register_cpu(struct cpu *cpu, int num);
|
|
extern struct sys_device *get_cpu_sysdev(unsigned cpu);
|
|
|
|
extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
|
|
extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
|
|
|
|
extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
|
|
extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
|
|
|
|
extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void unregister_cpu(struct cpu *cpu);
|
|
#endif
|
|
struct notifier_block;
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Need to know about CPUs going up/down? */
|
|
#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_hotplug_init(void);
|
|
extern void cpu_maps_update_begin(void);
|
|
extern void cpu_maps_update_done(void);
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
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_hotplug_init(void)
|
|
{
|
|
}
|
|
|
|
static inline void cpu_maps_update_begin(void)
|
|
{
|
|
}
|
|
|
|
static inline void cpu_maps_update_done(void)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
extern struct sysdev_class cpu_sysdev_class;
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
/* Stop CPUs going up and down. */
|
|
|
|
static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
|
|
{
|
|
mutex_lock(cpu_hp_mutex);
|
|
}
|
|
|
|
static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
|
|
{
|
|
mutex_unlock(cpu_hp_mutex);
|
|
}
|
|
|
|
extern void get_online_cpus(void);
|
|
extern void put_online_cpus(void);
|
|
#define hotcpu_notifier(fn, pri) { \
|
|
static struct notifier_block fn##_nb __cpuinitdata = \
|
|
{ .notifier_call = fn, .priority = pri }; \
|
|
register_cpu_notifier(&fn##_nb); \
|
|
}
|
|
#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
|
|
#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
|
|
int cpu_down(unsigned int cpu);
|
|
|
|
#else /* CONFIG_HOTPLUG_CPU */
|
|
|
|
static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
|
|
{ }
|
|
static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
|
|
{ }
|
|
|
|
#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 suspend_cpu_hotplug;
|
|
|
|
extern int disable_nonboot_cpus(void);
|
|
extern void enable_nonboot_cpus(void);
|
|
#else /* !CONFIG_PM_SLEEP_SMP */
|
|
#define suspend_cpu_hotplug 0
|
|
|
|
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_ */
|