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 #include <linux/llist.h> 15 16 typedef void (*smp_call_func_t)(void *info); 17 struct call_single_data { 18 struct llist_node llist; 19 smp_call_func_t func; 20 void *info; 21 u16 flags; 22 }; 23 24 /* total number of cpus in this system (may exceed NR_CPUS) */ 25 extern unsigned int total_cpus; 26 27 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, 28 int wait); 29 30 /* 31 * Call a function on all processors 32 */ 33 int on_each_cpu(smp_call_func_t func, void *info, int wait); 34 35 /* 36 * Call a function on processors specified by mask, which might include 37 * the local one. 38 */ 39 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, 40 void *info, bool wait); 41 42 /* 43 * Call a function on each processor for which the supplied function 44 * cond_func returns a positive value. This may include the local 45 * processor. 46 */ 47 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), 48 smp_call_func_t func, void *info, bool wait, 49 gfp_t gfp_flags); 50 51 int smp_call_function_single_async(int cpu, struct call_single_data *csd); 52 53 #ifdef CONFIG_SMP 54 55 #include <linux/preempt.h> 56 #include <linux/kernel.h> 57 #include <linux/compiler.h> 58 #include <linux/thread_info.h> 59 #include <asm/smp.h> 60 61 /* 62 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 63 * (defined in asm header): 64 */ 65 66 /* 67 * stops all CPUs but the current one: 68 */ 69 extern void smp_send_stop(void); 70 71 /* 72 * sends a 'reschedule' event to another CPU: 73 */ 74 extern void smp_send_reschedule(int cpu); 75 76 77 /* 78 * Prepare machine for booting other CPUs. 79 */ 80 extern void smp_prepare_cpus(unsigned int max_cpus); 81 82 /* 83 * Bring a CPU up 84 */ 85 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); 86 87 /* 88 * Final polishing of CPUs 89 */ 90 extern void smp_cpus_done(unsigned int max_cpus); 91 92 /* 93 * Call a function on all other processors 94 */ 95 int smp_call_function(smp_call_func_t func, void *info, int wait); 96 void smp_call_function_many(const struct cpumask *mask, 97 smp_call_func_t func, void *info, bool wait); 98 99 int smp_call_function_any(const struct cpumask *mask, 100 smp_call_func_t func, void *info, int wait); 101 102 void kick_all_cpus_sync(void); 103 104 /* 105 * Generic and arch helpers 106 */ 107 void __init call_function_init(void); 108 void generic_smp_call_function_single_interrupt(void); 109 #define generic_smp_call_function_interrupt \ 110 generic_smp_call_function_single_interrupt 111 112 /* 113 * Mark the boot cpu "online" so that it can call console drivers in 114 * printk() and can access its per-cpu storage. 115 */ 116 void smp_prepare_boot_cpu(void); 117 118 extern unsigned int setup_max_cpus; 119 extern void __init setup_nr_cpu_ids(void); 120 extern void __init smp_init(void); 121 122 #else /* !SMP */ 123 124 static inline void smp_send_stop(void) { } 125 126 /* 127 * These macros fold the SMP functionality into a single CPU system 128 */ 129 #define raw_smp_processor_id() 0 130 static inline int up_smp_call_function(smp_call_func_t func, void *info) 131 { 132 return 0; 133 } 134 #define smp_call_function(func, info, wait) \ 135 (up_smp_call_function(func, info)) 136 137 static inline void smp_send_reschedule(int cpu) { } 138 #define smp_prepare_boot_cpu() do {} while (0) 139 #define smp_call_function_many(mask, func, info, wait) \ 140 (up_smp_call_function(func, info)) 141 static inline void call_function_init(void) { } 142 143 static inline int 144 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, 145 void *info, int wait) 146 { 147 return smp_call_function_single(0, func, info, wait); 148 } 149 150 static inline void kick_all_cpus_sync(void) { } 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 */ 183 extern void arch_disable_smp_support(void); 184 185 extern void arch_enable_nonboot_cpus_begin(void); 186 extern void arch_enable_nonboot_cpus_end(void); 187 188 void smp_setup_processor_id(void); 189 190 #endif /* __LINUX_SMP_H */ 191