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 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 102 #define MSG_ALL 0x8001 103 104 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 105 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 106 * when rebooting 107 */ 108 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 109 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 110 111 /* 112 * Mark the boot cpu "online" so that it can call console drivers in 113 * printk() and can access its per-cpu storage. 114 */ 115 void smp_prepare_boot_cpu(void); 116 117 extern unsigned int setup_max_cpus; 118 extern void __init setup_nr_cpu_ids(void); 119 extern void __init smp_init(void); 120 121 #else /* !SMP */ 122 123 static inline void smp_send_stop(void) { } 124 125 /* 126 * These macros fold the SMP functionality into a single CPU system 127 */ 128 #define raw_smp_processor_id() 0 129 static inline int up_smp_call_function(smp_call_func_t func, void *info) 130 { 131 return 0; 132 } 133 #define smp_call_function(func, info, wait) \ 134 (up_smp_call_function(func, info)) 135 #define on_each_cpu(func,info,wait) \ 136 ({ \ 137 local_irq_disable(); \ 138 func(info); \ 139 local_irq_enable(); \ 140 0; \ 141 }) 142 static inline void smp_send_reschedule(int cpu) { } 143 #define num_booting_cpus() 1 144 #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 init_call_single_data(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 #endif /* !SMP */ 157 158 /* 159 * smp_processor_id(): get the current CPU ID. 160 * 161 * if DEBUG_PREEMPT is enabled then we check whether it is 162 * used in a preemption-safe way. (smp_processor_id() is safe 163 * if it's used in a preemption-off critical section, or in 164 * a thread that is bound to the current CPU.) 165 * 166 * NOTE: raw_smp_processor_id() is for internal use only 167 * (smp_processor_id() is the preferred variant), but in rare 168 * instances it might also be used to turn off false positives 169 * (i.e. smp_processor_id() use that the debugging code reports but 170 * which use for some reason is legal). Don't use this to hack around 171 * the warning message, as your code might not work under PREEMPT. 172 */ 173 #ifdef CONFIG_DEBUG_PREEMPT 174 extern unsigned int debug_smp_processor_id(void); 175 # define smp_processor_id() debug_smp_processor_id() 176 #else 177 # define smp_processor_id() raw_smp_processor_id() 178 #endif 179 180 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 181 #define put_cpu() preempt_enable() 182 183 /* 184 * Callback to arch code if there's nosmp or maxcpus=0 on the 185 * boot command line: 186 */ 187 extern void arch_disable_smp_support(void); 188 189 void smp_setup_processor_id(void); 190 191 #endif /* __LINUX_SMP_H */ 192