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 extern void cpu_idle(void); 17 18 typedef void (*smp_call_func_t)(void *info); 19 struct call_single_data { 20 struct llist_node llist; 21 smp_call_func_t func; 22 void *info; 23 u16 flags; 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 /* 33 * Call a function on all processors 34 */ 35 int on_each_cpu(smp_call_func_t func, void *info, int wait); 36 37 /* 38 * Call a function on processors specified by mask, which might include 39 * the local one. 40 */ 41 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, 42 void *info, bool wait); 43 44 /* 45 * Call a function on each processor for which the supplied function 46 * cond_func returns a positive value. This may include the local 47 * processor. 48 */ 49 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), 50 smp_call_func_t func, void *info, bool wait, 51 gfp_t gfp_flags); 52 53 int smp_call_function_single_async(int cpu, struct call_single_data *csd); 54 55 #ifdef CONFIG_SMP 56 57 #include <linux/preempt.h> 58 #include <linux/kernel.h> 59 #include <linux/compiler.h> 60 #include <linux/thread_info.h> 61 #include <asm/smp.h> 62 63 /* 64 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 65 * (defined in asm header): 66 */ 67 68 /* 69 * stops all CPUs but the current one: 70 */ 71 extern void smp_send_stop(void); 72 73 /* 74 * sends a 'reschedule' event to another CPU: 75 */ 76 extern void smp_send_reschedule(int cpu); 77 78 79 /* 80 * Prepare machine for booting other CPUs. 81 */ 82 extern void smp_prepare_cpus(unsigned int max_cpus); 83 84 /* 85 * Bring a CPU up 86 */ 87 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); 88 89 /* 90 * Final polishing of CPUs 91 */ 92 extern void smp_cpus_done(unsigned int max_cpus); 93 94 /* 95 * Call a function on all other processors 96 */ 97 int smp_call_function(smp_call_func_t func, void *info, int wait); 98 void smp_call_function_many(const struct cpumask *mask, 99 smp_call_func_t func, void *info, bool 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 void __init call_function_init(void); 110 void generic_smp_call_function_single_interrupt(void); 111 #define generic_smp_call_function_interrupt \ 112 generic_smp_call_function_single_interrupt 113 114 /* 115 * Mark the boot cpu "online" so that it can call console drivers in 116 * printk() and can access its per-cpu storage. 117 */ 118 void smp_prepare_boot_cpu(void); 119 120 extern unsigned int setup_max_cpus; 121 extern void __init setup_nr_cpu_ids(void); 122 extern void __init smp_init(void); 123 124 #else /* !SMP */ 125 126 static inline void smp_send_stop(void) { } 127 128 /* 129 * These macros fold the SMP functionality into a single CPU system 130 */ 131 #define raw_smp_processor_id() 0 132 static inline int up_smp_call_function(smp_call_func_t func, void *info) 133 { 134 return 0; 135 } 136 #define smp_call_function(func, info, wait) \ 137 (up_smp_call_function(func, info)) 138 139 static inline void smp_send_reschedule(int cpu) { } 140 #define smp_prepare_boot_cpu() do {} while (0) 141 #define smp_call_function_many(mask, func, info, wait) \ 142 (up_smp_call_function(func, info)) 143 static inline void call_function_init(void) { } 144 145 static inline int 146 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, 147 void *info, int wait) 148 { 149 return smp_call_function_single(0, func, info, wait); 150 } 151 152 static inline void kick_all_cpus_sync(void) { } 153 154 #endif /* !SMP */ 155 156 /* 157 * smp_processor_id(): get the current CPU ID. 158 * 159 * if DEBUG_PREEMPT is enabled then we check whether it is 160 * used in a preemption-safe way. (smp_processor_id() is safe 161 * if it's used in a preemption-off critical section, or in 162 * a thread that is bound to the current CPU.) 163 * 164 * NOTE: raw_smp_processor_id() is for internal use only 165 * (smp_processor_id() is the preferred variant), but in rare 166 * instances it might also be used to turn off false positives 167 * (i.e. smp_processor_id() use that the debugging code reports but 168 * which use for some reason is legal). Don't use this to hack around 169 * the warning message, as your code might not work under PREEMPT. 170 */ 171 #ifdef CONFIG_DEBUG_PREEMPT 172 extern unsigned int debug_smp_processor_id(void); 173 # define smp_processor_id() debug_smp_processor_id() 174 #else 175 # define smp_processor_id() raw_smp_processor_id() 176 #endif 177 178 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 179 #define put_cpu() preempt_enable() 180 181 /* 182 * Callback to arch code if there's nosmp or maxcpus=0 on the 183 * boot command line: 184 */ 185 extern void arch_disable_smp_support(void); 186 187 extern void arch_enable_nonboot_cpus_begin(void); 188 extern void arch_enable_nonboot_cpus_end(void); 189 190 void smp_setup_processor_id(void); 191 192 #endif /* __LINUX_SMP_H */ 193