140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
#ifndef __LINUX_SMP_H
|
|
#define __LINUX_SMP_H
|
|
|
|
/*
|
|
* Generic SMP support
|
|
* Alan Cox. <alan@redhat.com>
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
|
|
extern void cpu_idle(void);
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#include <linux/preempt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/thread_info.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/bug.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
|
|
*/
|
|
extern int smp_call_function (void (*func) (void *info), void *info,
|
|
int retry, int wait);
|
|
|
|
/*
|
|
* Call a function on all processors
|
|
*/
|
|
static inline int on_each_cpu(void (*func) (void *info), void *info,
|
|
int retry, int wait)
|
|
{
|
|
int ret = 0;
|
|
|
|
preempt_disable();
|
|
ret = smp_call_function(func, info, retry, wait);
|
|
func(info);
|
|
preempt_enable();
|
|
return ret;
|
|
}
|
|
|
|
#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);
|
|
|
|
#else /* !SMP */
|
|
|
|
/*
|
|
* These macros fold the SMP functionality into a single CPU system
|
|
*/
|
|
|
|
#if !defined(__smp_processor_id) || !defined(CONFIG_PREEMPT)
|
|
# define smp_processor_id() 0
|
|
#endif
|
|
#define hard_smp_processor_id() 0
|
|
#define smp_call_function(func,info,retry,wait) ({ 0; })
|
|
#define on_each_cpu(func,info,retry,wait) ({ func(info); 0; })
|
|
static inline void smp_send_reschedule(int cpu) { }
|
|
#define num_booting_cpus() 1
|
|
#define smp_prepare_boot_cpu() do {} while (0)
|
|
|
|
#endif /* !SMP */
|
|
|
|
/*
|
|
* DEBUG_PREEMPT support: check whether smp_processor_id() is being
|
|
* used in a preemption-safe way.
|
|
*
|
|
* An architecture has to enable this debugging code explicitly.
|
|
* It can do so by renaming the smp_processor_id() macro to
|
|
* __smp_processor_id(). This should only be done after some minimal
|
|
* testing, because usually there are a number of false positives
|
|
* that an architecture will trigger.
|
|
*
|
|
* To fix a false positive (i.e. smp_processor_id() use that the
|
|
* debugging code reports but which use for some reason is legal),
|
|
* change the smp_processor_id() reference to _smp_processor_id(),
|
|
* which is the nondebug variant. NOTE: don't use this to hack around
|
|
* real bugs.
|
|
*/
|
|
#ifdef __smp_processor_id
|
|
# if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT)
|
|
extern unsigned int smp_processor_id(void);
|
|
# else
|
|
# define smp_processor_id() __smp_processor_id()
|
|
# endif
|
|
# define _smp_processor_id() __smp_processor_id()
|
|
#else
|
|
# define _smp_processor_id() 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()
|
|
|
|
#endif /* __LINUX_SMP_H */
|