191 lines
4.8 KiB
C
191 lines
4.8 KiB
C
#ifndef __LINUX_SMP_H
|
|
#define __LINUX_SMP_H
|
|
|
|
/*
|
|
* Generic SMP support
|
|
* Alan Cox. <alan@redhat.com>
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <linux/cpumask.h>
|
|
|
|
extern void cpu_idle(void);
|
|
|
|
struct call_single_data {
|
|
struct list_head list;
|
|
void (*func) (void *info);
|
|
void *info;
|
|
u16 flags;
|
|
u16 priv;
|
|
};
|
|
|
|
/* total number of cpus in this system (may exceed NR_CPUS) */
|
|
extern unsigned int total_cpus;
|
|
|
|
int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
|
|
int wait);
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#include <linux/preempt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/thread_info.h>
|
|
#include <asm/smp.h>
|
|
|
|
/*
|
|
* main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
|
|
* (defined in asm header):
|
|
*/
|
|
|
|
/*
|
|
* stops all CPUs but the current one:
|
|
*/
|
|
extern void smp_send_stop(void);
|
|
|
|
/*
|
|
* sends a 'reschedule' event to another CPU:
|
|
*/
|
|
extern void smp_send_reschedule(int cpu);
|
|
|
|
|
|
/*
|
|
* Prepare machine for booting other CPUs.
|
|
*/
|
|
extern void smp_prepare_cpus(unsigned int max_cpus);
|
|
|
|
/*
|
|
* Bring a CPU up
|
|
*/
|
|
extern int __cpu_up(unsigned int cpunum);
|
|
|
|
/*
|
|
* Final polishing of CPUs
|
|
*/
|
|
extern void smp_cpus_done(unsigned int max_cpus);
|
|
|
|
/*
|
|
* Call a function on all other processors
|
|
*/
|
|
int smp_call_function(void(*func)(void *info), void *info, int wait);
|
|
void smp_call_function_many(const struct cpumask *mask,
|
|
void (*func)(void *info), void *info, bool wait);
|
|
|
|
/* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */
|
|
static inline int
|
|
smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
|
|
int wait)
|
|
{
|
|
smp_call_function_many(&mask, func, info, wait);
|
|
return 0;
|
|
}
|
|
|
|
void __smp_call_function_single(int cpuid, struct call_single_data *data,
|
|
int wait);
|
|
|
|
/*
|
|
* Generic and arch helpers
|
|
*/
|
|
#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
|
|
void generic_smp_call_function_single_interrupt(void);
|
|
void generic_smp_call_function_interrupt(void);
|
|
void ipi_call_lock(void);
|
|
void ipi_call_unlock(void);
|
|
void ipi_call_lock_irq(void);
|
|
void ipi_call_unlock_irq(void);
|
|
#endif
|
|
|
|
/*
|
|
* Call a function on all processors
|
|
*/
|
|
int on_each_cpu(void (*func) (void *info), void *info, int wait);
|
|
|
|
#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
|
|
#define MSG_ALL 0x8001
|
|
|
|
#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
|
|
#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
|
|
* when rebooting
|
|
*/
|
|
#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
|
|
#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
|
|
|
|
/*
|
|
* Mark the boot cpu "online" so that it can call console drivers in
|
|
* printk() and can access its per-cpu storage.
|
|
*/
|
|
void smp_prepare_boot_cpu(void);
|
|
|
|
extern unsigned int setup_max_cpus;
|
|
|
|
#else /* !SMP */
|
|
|
|
static inline void smp_send_stop(void) { }
|
|
|
|
/*
|
|
* These macros fold the SMP functionality into a single CPU system
|
|
*/
|
|
#define raw_smp_processor_id() 0
|
|
static inline int up_smp_call_function(void (*func)(void *), void *info)
|
|
{
|
|
return 0;
|
|
}
|
|
#define smp_call_function(func, info, wait) \
|
|
(up_smp_call_function(func, info))
|
|
#define on_each_cpu(func,info,wait) \
|
|
({ \
|
|
local_irq_disable(); \
|
|
func(info); \
|
|
local_irq_enable(); \
|
|
0; \
|
|
})
|
|
static inline void smp_send_reschedule(int cpu) { }
|
|
#define num_booting_cpus() 1
|
|
#define smp_prepare_boot_cpu() do {} while (0)
|
|
#define smp_call_function_mask(mask, func, info, wait) \
|
|
(up_smp_call_function(func, info))
|
|
#define smp_call_function_many(mask, func, info, wait) \
|
|
(up_smp_call_function(func, info))
|
|
static inline void init_call_single_data(void)
|
|
{
|
|
}
|
|
#endif /* !SMP */
|
|
|
|
/*
|
|
* smp_processor_id(): get the current CPU ID.
|
|
*
|
|
* if DEBUG_PREEMPT is enabled the we check whether it is
|
|
* used in a preemption-safe way. (smp_processor_id() is safe
|
|
* if it's used in a preemption-off critical section, or in
|
|
* a thread that is bound to the current CPU.)
|
|
*
|
|
* NOTE: raw_smp_processor_id() is for internal use only
|
|
* (smp_processor_id() is the preferred variant), but in rare
|
|
* instances it might also be used to turn off false positives
|
|
* (i.e. smp_processor_id() use that the debugging code reports but
|
|
* which use for some reason is legal). Don't use this to hack around
|
|
* the warning message, as your code might not work under PREEMPT.
|
|
*/
|
|
#ifdef CONFIG_DEBUG_PREEMPT
|
|
extern unsigned int debug_smp_processor_id(void);
|
|
# define smp_processor_id() debug_smp_processor_id()
|
|
#else
|
|
# define smp_processor_id() raw_smp_processor_id()
|
|
#endif
|
|
|
|
#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
|
|
#define put_cpu() preempt_enable()
|
|
#define put_cpu_no_resched() preempt_enable_no_resched()
|
|
|
|
/*
|
|
* Callback to arch code if there's nosmp or maxcpus=0 on the
|
|
* boot command line:
|
|
*/
|
|
extern void arch_disable_smp_support(void);
|
|
|
|
void smp_setup_processor_id(void);
|
|
|
|
#endif /* __LINUX_SMP_H */
|