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 generic_smp_call_function_single_interrupt(void); 89 void generic_smp_call_function_interrupt(void); 90 void ipi_call_lock(void); 91 void ipi_call_unlock(void); 92 void ipi_call_lock_irq(void); 93 void ipi_call_unlock_irq(void); 94 #endif 95 96 /* 97 * Call a function on all processors 98 */ 99 int on_each_cpu(smp_call_func_t func, void *info, int wait); 100 101 /* 102 * Mark the boot cpu "online" so that it can call console drivers in 103 * printk() and can access its per-cpu storage. 104 */ 105 void smp_prepare_boot_cpu(void); 106 107 extern unsigned int setup_max_cpus; 108 extern void __init setup_nr_cpu_ids(void); 109 extern void __init smp_init(void); 110 111 #else /* !SMP */ 112 113 static inline void smp_send_stop(void) { } 114 115 /* 116 * These macros fold the SMP functionality into a single CPU system 117 */ 118 #define raw_smp_processor_id() 0 119 static inline int up_smp_call_function(smp_call_func_t func, void *info) 120 { 121 return 0; 122 } 123 #define smp_call_function(func, info, wait) \ 124 (up_smp_call_function(func, info)) 125 #define on_each_cpu(func,info,wait) \ 126 ({ \ 127 local_irq_disable(); \ 128 func(info); \ 129 local_irq_enable(); \ 130 0; \ 131 }) 132 static inline void smp_send_reschedule(int cpu) { } 133 #define num_booting_cpus() 1 134 #define smp_prepare_boot_cpu() do {} while (0) 135 #define smp_call_function_many(mask, func, info, wait) \ 136 (up_smp_call_function(func, info)) 137 static inline void init_call_single_data(void) { } 138 139 static inline int 140 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, 141 void *info, int wait) 142 { 143 return smp_call_function_single(0, func, info, wait); 144 } 145 146 #endif /* !SMP */ 147 148 /* 149 * smp_processor_id(): get the current CPU ID. 150 * 151 * if DEBUG_PREEMPT is enabled then we check whether it is 152 * used in a preemption-safe way. (smp_processor_id() is safe 153 * if it's used in a preemption-off critical section, or in 154 * a thread that is bound to the current CPU.) 155 * 156 * NOTE: raw_smp_processor_id() is for internal use only 157 * (smp_processor_id() is the preferred variant), but in rare 158 * instances it might also be used to turn off false positives 159 * (i.e. smp_processor_id() use that the debugging code reports but 160 * which use for some reason is legal). Don't use this to hack around 161 * the warning message, as your code might not work under PREEMPT. 162 */ 163 #ifdef CONFIG_DEBUG_PREEMPT 164 extern unsigned int debug_smp_processor_id(void); 165 # define smp_processor_id() debug_smp_processor_id() 166 #else 167 # define smp_processor_id() raw_smp_processor_id() 168 #endif 169 170 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 171 #define put_cpu() preempt_enable() 172 173 /* 174 * Callback to arch code if there's nosmp or maxcpus=0 on the 175 * boot command line: 176 */ 177 extern void arch_disable_smp_support(void); 178 179 void smp_setup_processor_id(void); 180 181 #endif /* __LINUX_SMP_H */ 182