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 /* total number of cpus in this system (may exceed NR_CPUS) */ 25 extern unsigned int total_cpus; 26 27 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 28 int wait); 29 30 #ifdef CONFIG_SMP 31 32 #include <linux/preempt.h> 33 #include <linux/kernel.h> 34 #include <linux/compiler.h> 35 #include <linux/thread_info.h> 36 #include <asm/smp.h> 37 38 /* 39 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 40 * (defined in asm header): 41 */ 42 43 /* 44 * stops all CPUs but the current one: 45 */ 46 extern void smp_send_stop(void); 47 48 /* 49 * sends a 'reschedule' event to another CPU: 50 */ 51 extern void smp_send_reschedule(int cpu); 52 53 54 /* 55 * Prepare machine for booting other CPUs. 56 */ 57 extern void smp_prepare_cpus(unsigned int max_cpus); 58 59 /* 60 * Bring a CPU up 61 */ 62 extern int __cpu_up(unsigned int cpunum); 63 64 /* 65 * Final polishing of CPUs 66 */ 67 extern void smp_cpus_done(unsigned int max_cpus); 68 69 /* 70 * Call a function on all other processors 71 */ 72 int smp_call_function(void(*func)(void *info), void *info, int wait); 73 void smp_call_function_many(const struct cpumask *mask, 74 void (*func)(void *info), void *info, bool wait); 75 76 void __smp_call_function_single(int cpuid, struct call_single_data *data, 77 int wait); 78 79 int smp_call_function_any(const struct cpumask *mask, 80 void (*func)(void *info), void *info, int wait); 81 82 /* 83 * Generic and arch helpers 84 */ 85 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS 86 void generic_smp_call_function_single_interrupt(void); 87 void generic_smp_call_function_interrupt(void); 88 void ipi_call_lock(void); 89 void ipi_call_unlock(void); 90 void ipi_call_lock_irq(void); 91 void ipi_call_unlock_irq(void); 92 #endif 93 94 /* 95 * Call a function on all processors 96 */ 97 int on_each_cpu(void (*func) (void *info), void *info, int wait); 98 99 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 100 #define MSG_ALL 0x8001 101 102 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 103 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 104 * when rebooting 105 */ 106 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 107 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 108 109 /* 110 * Mark the boot cpu "online" so that it can call console drivers in 111 * printk() and can access its per-cpu storage. 112 */ 113 void smp_prepare_boot_cpu(void); 114 115 extern unsigned int setup_max_cpus; 116 117 #else /* !SMP */ 118 119 static inline void smp_send_stop(void) { } 120 121 /* 122 * These macros fold the SMP functionality into a single CPU system 123 */ 124 #define raw_smp_processor_id() 0 125 static inline int up_smp_call_function(void (*func)(void *), void *info) 126 { 127 return 0; 128 } 129 #define smp_call_function(func, info, wait) \ 130 (up_smp_call_function(func, info)) 131 #define on_each_cpu(func,info,wait) \ 132 ({ \ 133 local_irq_disable(); \ 134 func(info); \ 135 local_irq_enable(); \ 136 0; \ 137 }) 138 static inline void smp_send_reschedule(int cpu) { } 139 #define num_booting_cpus() 1 140 #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 init_call_single_data(void) { } 144 145 static inline int 146 smp_call_function_any(const struct cpumask *mask, void (*func)(void *info), 147 void *info, int wait) 148 { 149 return smp_call_function_single(0, func, info, wait); 150 } 151 152 #endif /* !SMP */ 153 154 /* 155 * smp_processor_id(): get the current CPU ID. 156 * 157 * if DEBUG_PREEMPT is enabled then we check whether it is 158 * used in a preemption-safe way. (smp_processor_id() is safe 159 * if it's used in a preemption-off critical section, or in 160 * a thread that is bound to the current CPU.) 161 * 162 * NOTE: raw_smp_processor_id() is for internal use only 163 * (smp_processor_id() is the preferred variant), but in rare 164 * instances it might also be used to turn off false positives 165 * (i.e. smp_processor_id() use that the debugging code reports but 166 * which use for some reason is legal). Don't use this to hack around 167 * the warning message, as your code might not work under PREEMPT. 168 */ 169 #ifdef CONFIG_DEBUG_PREEMPT 170 extern unsigned int debug_smp_processor_id(void); 171 # define smp_processor_id() debug_smp_processor_id() 172 #else 173 # define smp_processor_id() raw_smp_processor_id() 174 #endif 175 176 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 177 #define put_cpu() preempt_enable() 178 179 /* 180 * Callback to arch code if there's nosmp or maxcpus=0 on the 181 * boot command line: 182 */ 183 extern void arch_disable_smp_support(void); 184 185 void smp_setup_processor_id(void); 186 187 #endif /* __LINUX_SMP_H */ 188