1#ifndef __LINUX_SMP_H 2#define __LINUX_SMP_H 3 4/* 5 * Generic SMP support 6 * Alan Cox. <alan@redhat.com> 7 */ 8 9#include <linux/errno.h> 10#include <linux/types.h> 11#include <linux/list.h> 12#include <linux/cpumask.h> 13 14extern void cpu_idle(void); 15 16struct call_single_data { 17 struct list_head list; 18 void (*func) (void *info); 19 void *info; 20 u16 flags; 21 u16 priv; 22}; 23 24/* total number of cpus in this system (may exceed NR_CPUS) */ 25extern unsigned int total_cpus; 26 27int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 28 int wait); 29 30#ifdef CONFIG_SMP 31 32#include <linux/preempt.h> 33#include <linux/kernel.h> 34#include <linux/compiler.h> 35#include <linux/thread_info.h> 36#include <asm/smp.h> 37 38/* 39 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 40 * (defined in asm header): 41 */ 42 43/* 44 * stops all CPUs but the current one: 45 */ 46extern void smp_send_stop(void); 47 48/* 49 * sends a 'reschedule' event to another CPU: 50 */ 51extern void smp_send_reschedule(int cpu); 52 53 54/* 55 * Prepare machine for booting other CPUs. 56 */ 57extern void smp_prepare_cpus(unsigned int max_cpus); 58 59/* 60 * Bring a CPU up 61 */ 62extern int __cpu_up(unsigned int cpunum); 63 64/* 65 * Final polishing of CPUs 66 */ 67extern void smp_cpus_done(unsigned int max_cpus); 68 69/* 70 * Call a function on all other processors 71 */ 72int smp_call_function(void(*func)(void *info), void *info, int wait); 73void smp_call_function_many(const struct cpumask *mask, 74 void (*func)(void *info), void *info, bool wait); 75 76void __smp_call_function_single(int cpuid, struct call_single_data *data, 77 int wait); 78 79int smp_call_function_any(const struct cpumask *mask, 80 void (*func)(void *info), void *info, int wait); 81 82/* 83 * Generic and arch helpers 84 */ 85#ifdef CONFIG_USE_GENERIC_SMP_HELPERS 86void generic_smp_call_function_single_interrupt(void); 87void generic_smp_call_function_interrupt(void); 88void ipi_call_lock(void); 89void ipi_call_unlock(void); 90void ipi_call_lock_irq(void); 91void ipi_call_unlock_irq(void); 92#endif 93 94/* 95 * Call a function on all processors 96 */ 97int on_each_cpu(void (*func) (void *info), void *info, int wait); 98 99#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 100#define MSG_ALL 0x8001 101 102#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 103#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 104 * when rebooting 105 */ 106#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 107#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 108 109/* 110 * Mark the boot cpu "online" so that it can call console drivers in 111 * printk() and can access its per-cpu storage. 112 */ 113void smp_prepare_boot_cpu(void); 114 115extern unsigned int setup_max_cpus; 116 117#else /* !SMP */ 118 119static inline void smp_send_stop(void) { } 120 121/* 122 * These macros fold the SMP functionality into a single CPU system 123 */ 124#define raw_smp_processor_id() 0 125static inline int up_smp_call_function(void (*func)(void *), void *info) 126{ 127 return 0; 128} 129#define smp_call_function(func, info, wait) \ 130 (up_smp_call_function(func, info)) 131#define on_each_cpu(func,info,wait) \ 132 ({ \ 133 local_irq_disable(); \ 134 func(info); \ 135 local_irq_enable(); \ 136 0; \ 137 }) 138static inline void smp_send_reschedule(int cpu) { } 139#define num_booting_cpus() 1 140#define smp_prepare_boot_cpu() do {} while (0) 141#define smp_call_function_many(mask, func, info, wait) \ 142 (up_smp_call_function(func, info)) 143static inline void init_call_single_data(void) { } 144 145static inline int 146smp_call_function_any(const struct cpumask *mask, void (*func)(void *info), 147 void *info, int wait) 148{ 149 return smp_call_function_single(0, func, info, wait); 150} 151 152#endif /* !SMP */ 153 154/* 155 * smp_processor_id(): get the current CPU ID. 156 * 157 * if DEBUG_PREEMPT is enabled then we check whether it is 158 * used in a preemption-safe way. (smp_processor_id() is safe 159 * if it's used in a preemption-off critical section, or in 160 * a thread that is bound to the current CPU.) 161 * 162 * NOTE: raw_smp_processor_id() is for internal use only 163 * (smp_processor_id() is the preferred variant), but in rare 164 * instances it might also be used to turn off false positives 165 * (i.e. smp_processor_id() use that the debugging code reports but 166 * which use for some reason is legal). Don't use this to hack around 167 * the warning message, as your code might not work under PREEMPT. 168 */ 169#ifdef CONFIG_DEBUG_PREEMPT 170 extern unsigned int debug_smp_processor_id(void); 171# define smp_processor_id() debug_smp_processor_id() 172#else 173# define smp_processor_id() raw_smp_processor_id() 174#endif 175 176#define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 177#define put_cpu() preempt_enable() 178 179/* 180 * Callback to arch code if there's nosmp or maxcpus=0 on the 181 * boot command line: 182 */ 183extern void arch_disable_smp_support(void); 184 185void smp_setup_processor_id(void); 186 187#endif /* __LINUX_SMP_H */ 188