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 }; 24 25 /* total number of cpus in this system (may exceed NR_CPUS) */ 26 extern unsigned int total_cpus; 27 28 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, 29 int wait); 30 31 /* 32 * Call a function on all processors 33 */ 34 int on_each_cpu(smp_call_func_t func, void *info, int wait); 35 36 /* 37 * Call a function on processors specified by mask, which might include 38 * the local one. 39 */ 40 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, 41 void *info, bool wait); 42 43 /* 44 * Call a function on each processor for which the supplied function 45 * cond_func returns a positive value. This may include the local 46 * processor. 47 */ 48 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), 49 smp_call_func_t func, void *info, bool wait, 50 gfp_t gfp_flags); 51 52 #ifdef CONFIG_SMP 53 54 #include <linux/preempt.h> 55 #include <linux/kernel.h> 56 #include <linux/compiler.h> 57 #include <linux/thread_info.h> 58 #include <asm/smp.h> 59 60 /* 61 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 62 * (defined in asm header): 63 */ 64 65 /* 66 * stops all CPUs but the current one: 67 */ 68 extern void smp_send_stop(void); 69 70 /* 71 * sends a 'reschedule' event to another CPU: 72 */ 73 extern void smp_send_reschedule(int cpu); 74 75 76 /* 77 * Prepare machine for booting other CPUs. 78 */ 79 extern void smp_prepare_cpus(unsigned int max_cpus); 80 81 /* 82 * Bring a CPU up 83 */ 84 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); 85 86 /* 87 * Final polishing of CPUs 88 */ 89 extern void smp_cpus_done(unsigned int max_cpus); 90 91 /* 92 * Call a function on all other processors 93 */ 94 int smp_call_function(smp_call_func_t func, void *info, int wait); 95 void smp_call_function_many(const struct cpumask *mask, 96 smp_call_func_t func, void *info, bool wait); 97 98 void __smp_call_function_single(int cpuid, struct call_single_data *data, 99 int wait); 100 101 int smp_call_function_any(const struct cpumask *mask, 102 smp_call_func_t func, void *info, int wait); 103 104 void kick_all_cpus_sync(void); 105 106 /* 107 * Generic and arch helpers 108 */ 109 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS 110 void __init call_function_init(void); 111 void generic_smp_call_function_single_interrupt(void); 112 #define generic_smp_call_function_interrupt \ 113 generic_smp_call_function_single_interrupt 114 #else 115 static inline void call_function_init(void) { } 116 #endif 117 118 /* 119 * Mark the boot cpu "online" so that it can call console drivers in 120 * printk() and can access its per-cpu storage. 121 */ 122 void smp_prepare_boot_cpu(void); 123 124 extern unsigned int setup_max_cpus; 125 extern void __init setup_nr_cpu_ids(void); 126 extern void __init smp_init(void); 127 128 #else /* !SMP */ 129 130 static inline void smp_send_stop(void) { } 131 132 /* 133 * These macros fold the SMP functionality into a single CPU system 134 */ 135 #define raw_smp_processor_id() 0 136 static inline int up_smp_call_function(smp_call_func_t func, void *info) 137 { 138 return 0; 139 } 140 #define smp_call_function(func, info, wait) \ 141 (up_smp_call_function(func, info)) 142 143 static inline void smp_send_reschedule(int cpu) { } 144 #define smp_prepare_boot_cpu() do {} while (0) 145 #define smp_call_function_many(mask, func, info, wait) \ 146 (up_smp_call_function(func, info)) 147 static inline void call_function_init(void) { } 148 149 static inline int 150 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, 151 void *info, int wait) 152 { 153 return smp_call_function_single(0, func, info, wait); 154 } 155 156 static inline void kick_all_cpus_sync(void) { } 157 158 static inline void __smp_call_function_single(int cpuid, 159 struct call_single_data *data, int wait) 160 { 161 on_each_cpu(data->func, data->info, wait); 162 } 163 164 #endif /* !SMP */ 165 166 /* 167 * smp_processor_id(): get the current CPU ID. 168 * 169 * if DEBUG_PREEMPT is enabled then we check whether it is 170 * used in a preemption-safe way. (smp_processor_id() is safe 171 * if it's used in a preemption-off critical section, or in 172 * a thread that is bound to the current CPU.) 173 * 174 * NOTE: raw_smp_processor_id() is for internal use only 175 * (smp_processor_id() is the preferred variant), but in rare 176 * instances it might also be used to turn off false positives 177 * (i.e. smp_processor_id() use that the debugging code reports but 178 * which use for some reason is legal). Don't use this to hack around 179 * the warning message, as your code might not work under PREEMPT. 180 */ 181 #ifdef CONFIG_DEBUG_PREEMPT 182 extern unsigned int debug_smp_processor_id(void); 183 # define smp_processor_id() debug_smp_processor_id() 184 #else 185 # define smp_processor_id() raw_smp_processor_id() 186 #endif 187 188 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 189 #define put_cpu() preempt_enable() 190 191 /* 192 * Callback to arch code if there's nosmp or maxcpus=0 on the 193 * boot command line: 194 */ 195 extern void arch_disable_smp_support(void); 196 197 void smp_setup_processor_id(void); 198 199 #endif /* __LINUX_SMP_H */ 200