1 #ifndef __LINUX_SMP_H 2 #define __LINUX_SMP_H 3 4 /* 5 * Generic SMP support 6 * Alan Cox. <[email protected]> 7 */ 8 9 #include <linux/errno.h> 10 #include <linux/types.h> 11 #include <linux/list.h> 12 #include <linux/cpumask.h> 13 14 extern void cpu_idle(void); 15 16 struct 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) */ 25 extern unsigned int total_cpus; 26 27 #ifdef CONFIG_SMP 28 29 #include <linux/preempt.h> 30 #include <linux/kernel.h> 31 #include <linux/compiler.h> 32 #include <linux/thread_info.h> 33 #include <asm/smp.h> 34 35 /* 36 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 37 * (defined in asm header): 38 */ 39 40 /* 41 * stops all CPUs but the current one: 42 */ 43 extern void smp_send_stop(void); 44 45 /* 46 * sends a 'reschedule' event to another CPU: 47 */ 48 extern void smp_send_reschedule(int cpu); 49 50 51 /* 52 * Prepare machine for booting other CPUs. 53 */ 54 extern void smp_prepare_cpus(unsigned int max_cpus); 55 56 /* 57 * Bring a CPU up 58 */ 59 extern int __cpu_up(unsigned int cpunum); 60 61 /* 62 * Final polishing of CPUs 63 */ 64 extern void smp_cpus_done(unsigned int max_cpus); 65 66 /* 67 * Call a function on all other processors 68 */ 69 int smp_call_function(void(*func)(void *info), void *info, int wait); 70 void smp_call_function_many(const struct cpumask *mask, 71 void (*func)(void *info), void *info, bool wait); 72 73 /* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */ 74 static inline int 75 smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info, 76 int wait) 77 { 78 smp_call_function_many(&mask, func, info, wait); 79 return 0; 80 } 81 82 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 83 int wait); 84 void __smp_call_function_single(int cpuid, struct call_single_data *data); 85 86 /* 87 * Generic and arch helpers 88 */ 89 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS 90 void generic_smp_call_function_single_interrupt(void); 91 void generic_smp_call_function_interrupt(void); 92 void ipi_call_lock(void); 93 void ipi_call_unlock(void); 94 void ipi_call_lock_irq(void); 95 void ipi_call_unlock_irq(void); 96 #endif 97 98 /* 99 * Call a function on all processors 100 */ 101 int on_each_cpu(void (*func) (void *info), void *info, int wait); 102 103 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 104 #define MSG_ALL 0x8001 105 106 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 107 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 108 * when rebooting 109 */ 110 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 111 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 112 113 /* 114 * Mark the boot cpu "online" so that it can call console drivers in 115 * printk() and can access its per-cpu storage. 116 */ 117 void smp_prepare_boot_cpu(void); 118 119 extern unsigned int setup_max_cpus; 120 121 #else /* !SMP */ 122 123 /* 124 * These macros fold the SMP functionality into a single CPU system 125 */ 126 #define raw_smp_processor_id() 0 127 static inline int up_smp_call_function(void (*func)(void *), void *info) 128 { 129 return 0; 130 } 131 #define smp_call_function(func, info, wait) \ 132 (up_smp_call_function(func, info)) 133 #define on_each_cpu(func,info,wait) \ 134 ({ \ 135 local_irq_disable(); \ 136 func(info); \ 137 local_irq_enable(); \ 138 0; \ 139 }) 140 static inline void smp_send_reschedule(int cpu) { } 141 #define num_booting_cpus() 1 142 #define smp_prepare_boot_cpu() do {} while (0) 143 #define smp_call_function_single(cpuid, func, info, wait) \ 144 ({ \ 145 WARN_ON(cpuid != 0); \ 146 local_irq_disable(); \ 147 (func)(info); \ 148 local_irq_enable(); \ 149 0; \ 150 }) 151 #define smp_call_function_mask(mask, func, info, wait) \ 152 (up_smp_call_function(func, info)) 153 #define smp_call_function_many(mask, func, info, wait) \ 154 (up_smp_call_function(func, info)) 155 static inline void init_call_single_data(void) 156 { 157 } 158 #endif /* !SMP */ 159 160 /* 161 * smp_processor_id(): get the current CPU ID. 162 * 163 * if DEBUG_PREEMPT is enabled the we check whether it is 164 * used in a preemption-safe way. (smp_processor_id() is safe 165 * if it's used in a preemption-off critical section, or in 166 * a thread that is bound to the current CPU.) 167 * 168 * NOTE: raw_smp_processor_id() is for internal use only 169 * (smp_processor_id() is the preferred variant), but in rare 170 * instances it might also be used to turn off false positives 171 * (i.e. smp_processor_id() use that the debugging code reports but 172 * which use for some reason is legal). Don't use this to hack around 173 * the warning message, as your code might not work under PREEMPT. 174 */ 175 #ifdef CONFIG_DEBUG_PREEMPT 176 extern unsigned int debug_smp_processor_id(void); 177 # define smp_processor_id() debug_smp_processor_id() 178 #else 179 # define smp_processor_id() raw_smp_processor_id() 180 #endif 181 182 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 183 #define put_cpu() preempt_enable() 184 #define put_cpu_no_resched() preempt_enable_no_resched() 185 186 void smp_setup_processor_id(void); 187 188 #endif /* __LINUX_SMP_H */ 189