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