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 init_call_single_data(void); 78 void ipi_call_lock(void); 79 void ipi_call_unlock(void); 80 void ipi_call_lock_irq(void); 81 void ipi_call_unlock_irq(void); 82 #else 83 static inline void init_call_single_data(void) 84 { 85 } 86 #endif 87 88 /* 89 * Call a function on all processors 90 */ 91 int on_each_cpu(void (*func) (void *info), void *info, int wait); 92 93 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 94 #define MSG_ALL 0x8001 95 96 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 97 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 98 * when rebooting 99 */ 100 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 101 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 102 103 /* 104 * Mark the boot cpu "online" so that it can call console drivers in 105 * printk() and can access its per-cpu storage. 106 */ 107 void smp_prepare_boot_cpu(void); 108 109 extern unsigned int setup_max_cpus; 110 111 #else /* !SMP */ 112 113 /* 114 * These macros fold the SMP functionality into a single CPU system 115 */ 116 #define raw_smp_processor_id() 0 117 static inline int up_smp_call_function(void (*func)(void *), void *info) 118 { 119 return 0; 120 } 121 #define smp_call_function(func, info, wait) \ 122 (up_smp_call_function(func, info)) 123 #define on_each_cpu(func,info,wait) \ 124 ({ \ 125 local_irq_disable(); \ 126 func(info); \ 127 local_irq_enable(); \ 128 0; \ 129 }) 130 static inline void smp_send_reschedule(int cpu) { } 131 #define num_booting_cpus() 1 132 #define smp_prepare_boot_cpu() do {} while (0) 133 #define smp_call_function_single(cpuid, func, info, wait) \ 134 ({ \ 135 WARN_ON(cpuid != 0); \ 136 local_irq_disable(); \ 137 (func)(info); \ 138 local_irq_enable(); \ 139 0; \ 140 }) 141 #define smp_call_function_mask(mask, func, info, wait) \ 142 (up_smp_call_function(func, info)) 143 static inline void init_call_single_data(void) 144 { 145 } 146 #endif /* !SMP */ 147 148 /* 149 * smp_processor_id(): get the current CPU ID. 150 * 151 * if DEBUG_PREEMPT is enabled the we check whether it is 152 * used in a preemption-safe way. (smp_processor_id() is safe 153 * if it's used in a preemption-off critical section, or in 154 * a thread that is bound to the current CPU.) 155 * 156 * NOTE: raw_smp_processor_id() is for internal use only 157 * (smp_processor_id() is the preferred variant), but in rare 158 * instances it might also be used to turn off false positives 159 * (i.e. smp_processor_id() use that the debugging code reports but 160 * which use for some reason is legal). Don't use this to hack around 161 * the warning message, as your code might not work under PREEMPT. 162 */ 163 #ifdef CONFIG_DEBUG_PREEMPT 164 extern unsigned int debug_smp_processor_id(void); 165 # define smp_processor_id() debug_smp_processor_id() 166 #else 167 # define smp_processor_id() raw_smp_processor_id() 168 #endif 169 170 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 171 #define put_cpu() preempt_enable() 172 #define put_cpu_no_resched() preempt_enable_no_resched() 173 174 void smp_setup_processor_id(void); 175 176 #endif /* __LINUX_SMP_H */ 177