#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); 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_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() /* * 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 */