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/list.h> 11 #include <linux/cpumask.h> 12 13 extern void cpu_idle(void); 14 15 struct call_single_data { 16 struct list_head list; 17 void (*func) (void *info); 18 void *info; 19 unsigned int flags; 20 }; 21 22 #ifdef CONFIG_SMP 23 24 #include <linux/preempt.h> 25 #include <linux/kernel.h> 26 #include <linux/compiler.h> 27 #include <linux/thread_info.h> 28 #include <asm/smp.h> 29 30 /* 31 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 32 * (defined in asm header): 33 */ 34 35 /* 36 * stops all CPUs but the current one: 37 */ 38 extern void smp_send_stop(void); 39 40 /* 41 * sends a 'reschedule' event to another CPU: 42 */ 43 extern void smp_send_reschedule(int cpu); 44 45 46 /* 47 * Prepare machine for booting other CPUs. 48 */ 49 extern void smp_prepare_cpus(unsigned int max_cpus); 50 51 /* 52 * Bring a CPU up 53 */ 54 extern int __cpu_up(unsigned int cpunum); 55 56 /* 57 * Final polishing of CPUs 58 */ 59 extern void smp_cpus_done(unsigned int max_cpus); 60 61 /* 62 * Call a function on all other processors 63 */ 64 int smp_call_function(void(*func)(void *info), void *info, int wait); 65 int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info, 66 int wait); 67 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 68 int wait); 69 void __smp_call_function_single(int cpuid, struct call_single_data *data); 70 71 /* 72 * Generic and arch helpers 73 */ 74 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS 75 void generic_smp_call_function_single_interrupt(void); 76 void generic_smp_call_function_interrupt(void); 77 void ipi_call_lock(void); 78 void ipi_call_unlock(void); 79 void ipi_call_lock_irq(void); 80 void ipi_call_unlock_irq(void); 81 #endif 82 83 /* 84 * Call a function on all processors 85 */ 86 int on_each_cpu(void (*func) (void *info), void *info, int wait); 87 88 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 89 #define MSG_ALL 0x8001 90 91 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 92 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 93 * when rebooting 94 */ 95 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 96 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 97 98 /* 99 * Mark the boot cpu "online" so that it can call console drivers in 100 * printk() and can access its per-cpu storage. 101 */ 102 void smp_prepare_boot_cpu(void); 103 104 extern unsigned int setup_max_cpus; 105 106 #else /* !SMP */ 107 108 /* 109 * These macros fold the SMP functionality into a single CPU system 110 */ 111 #define raw_smp_processor_id() 0 112 static inline int up_smp_call_function(void (*func)(void *), void *info) 113 { 114 return 0; 115 } 116 #define smp_call_function(func, info, wait) \ 117 (up_smp_call_function(func, info)) 118 #define on_each_cpu(func,info,wait) \ 119 ({ \ 120 local_irq_disable(); \ 121 func(info); \ 122 local_irq_enable(); \ 123 0; \ 124 }) 125 static inline void smp_send_reschedule(int cpu) { } 126 #define num_booting_cpus() 1 127 #define smp_prepare_boot_cpu() do {} while (0) 128 #define smp_call_function_single(cpuid, func, info, wait) \ 129 ({ \ 130 WARN_ON(cpuid != 0); \ 131 local_irq_disable(); \ 132 (func)(info); \ 133 local_irq_enable(); \ 134 0; \ 135 }) 136 #define smp_call_function_mask(mask, func, info, wait) \ 137 (up_smp_call_function(func, info)) 138 static inline void init_call_single_data(void) 139 { 140 } 141 #endif /* !SMP */ 142 143 /* 144 * smp_processor_id(): get the current CPU ID. 145 * 146 * if DEBUG_PREEMPT is enabled the we check whether it is 147 * used in a preemption-safe way. (smp_processor_id() is safe 148 * if it's used in a preemption-off critical section, or in 149 * a thread that is bound to the current CPU.) 150 * 151 * NOTE: raw_smp_processor_id() is for internal use only 152 * (smp_processor_id() is the preferred variant), but in rare 153 * instances it might also be used to turn off false positives 154 * (i.e. smp_processor_id() use that the debugging code reports but 155 * which use for some reason is legal). Don't use this to hack around 156 * the warning message, as your code might not work under PREEMPT. 157 */ 158 #ifdef CONFIG_DEBUG_PREEMPT 159 extern unsigned int debug_smp_processor_id(void); 160 # define smp_processor_id() debug_smp_processor_id() 161 #else 162 # define smp_processor_id() raw_smp_processor_id() 163 #endif 164 165 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 166 #define put_cpu() preempt_enable() 167 #define put_cpu_no_resched() preempt_enable_no_resched() 168 169 void smp_setup_processor_id(void); 170 171 #endif /* __LINUX_SMP_H */ 172