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 14 extern void cpu_idle(void); 15 16 struct call_single_data { 17 struct list_head list; 18 void (*func) (void *info); 19 void *info; 20 u16 flags; 21 u16 priv; 22 }; 23 24 #ifdef CONFIG_SMP 25 26 #include <linux/preempt.h> 27 #include <linux/kernel.h> 28 #include <linux/compiler.h> 29 #include <linux/thread_info.h> 30 #include <asm/smp.h> 31 32 /* 33 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 34 * (defined in asm header): 35 */ 36 37 /* 38 * stops all CPUs but the current one: 39 */ 40 extern void smp_send_stop(void); 41 42 /* 43 * sends a 'reschedule' event to another CPU: 44 */ 45 extern void smp_send_reschedule(int cpu); 46 47 48 /* 49 * Prepare machine for booting other CPUs. 50 */ 51 extern void smp_prepare_cpus(unsigned int max_cpus); 52 53 /* 54 * Bring a CPU up 55 */ 56 extern int __cpu_up(unsigned int cpunum); 57 58 /* 59 * Final polishing of CPUs 60 */ 61 extern void smp_cpus_done(unsigned int max_cpus); 62 63 /* 64 * Call a function on all other processors 65 */ 66 int smp_call_function(void(*func)(void *info), void *info, int wait); 67 int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info, 68 int wait); 69 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 70 int wait); 71 void __smp_call_function_single(int cpuid, struct call_single_data *data); 72 73 /* 74 * Generic and arch helpers 75 */ 76 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS 77 void generic_smp_call_function_single_interrupt(void); 78 void generic_smp_call_function_interrupt(void); 79 void ipi_call_lock(void); 80 void ipi_call_unlock(void); 81 void ipi_call_lock_irq(void); 82 void ipi_call_unlock_irq(void); 83 #endif 84 85 /* 86 * Call a function on all processors 87 */ 88 int on_each_cpu(void (*func) (void *info), void *info, int wait); 89 90 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 91 #define MSG_ALL 0x8001 92 93 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 94 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 95 * when rebooting 96 */ 97 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 98 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 99 100 /* 101 * Mark the boot cpu "online" so that it can call console drivers in 102 * printk() and can access its per-cpu storage. 103 */ 104 void smp_prepare_boot_cpu(void); 105 106 extern unsigned int setup_max_cpus; 107 108 #else /* !SMP */ 109 110 /* 111 * These macros fold the SMP functionality into a single CPU system 112 */ 113 #define raw_smp_processor_id() 0 114 static inline int up_smp_call_function(void (*func)(void *), void *info) 115 { 116 return 0; 117 } 118 #define smp_call_function(func, info, wait) \ 119 (up_smp_call_function(func, info)) 120 #define on_each_cpu(func,info,wait) \ 121 ({ \ 122 local_irq_disable(); \ 123 func(info); \ 124 local_irq_enable(); \ 125 0; \ 126 }) 127 static inline void smp_send_reschedule(int cpu) { } 128 #define num_booting_cpus() 1 129 #define smp_prepare_boot_cpu() do {} while (0) 130 #define smp_call_function_single(cpuid, func, info, wait) \ 131 ({ \ 132 WARN_ON(cpuid != 0); \ 133 local_irq_disable(); \ 134 (func)(info); \ 135 local_irq_enable(); \ 136 0; \ 137 }) 138 #define smp_call_function_mask(mask, func, info, wait) \ 139 (up_smp_call_function(func, info)) 140 static inline void init_call_single_data(void) 141 { 142 } 143 #endif /* !SMP */ 144 145 /* 146 * smp_processor_id(): get the current CPU ID. 147 * 148 * if DEBUG_PREEMPT is enabled the we check whether it is 149 * used in a preemption-safe way. (smp_processor_id() is safe 150 * if it's used in a preemption-off critical section, or in 151 * a thread that is bound to the current CPU.) 152 * 153 * NOTE: raw_smp_processor_id() is for internal use only 154 * (smp_processor_id() is the preferred variant), but in rare 155 * instances it might also be used to turn off false positives 156 * (i.e. smp_processor_id() use that the debugging code reports but 157 * which use for some reason is legal). Don't use this to hack around 158 * the warning message, as your code might not work under PREEMPT. 159 */ 160 #ifdef CONFIG_DEBUG_PREEMPT 161 extern unsigned int debug_smp_processor_id(void); 162 # define smp_processor_id() debug_smp_processor_id() 163 #else 164 # define smp_processor_id() raw_smp_processor_id() 165 #endif 166 167 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 168 #define put_cpu() preempt_enable() 169 #define put_cpu_no_resched() preempt_enable_no_resched() 170 171 void smp_setup_processor_id(void); 172 173 #endif /* __LINUX_SMP_H */ 174