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 /* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */ 77 static inline int 78 smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info, 79 int wait) 80 { 81 smp_call_function_many(&mask, func, info, wait); 82 return 0; 83 } 84 85 void __smp_call_function_single(int cpuid, struct call_single_data *data); 86 87 /* 88 * Generic and arch helpers 89 */ 90 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS 91 void generic_smp_call_function_single_interrupt(void); 92 void generic_smp_call_function_interrupt(void); 93 void ipi_call_lock(void); 94 void ipi_call_unlock(void); 95 void ipi_call_lock_irq(void); 96 void ipi_call_unlock_irq(void); 97 #endif 98 99 /* 100 * Call a function on all processors 101 */ 102 int on_each_cpu(void (*func) (void *info), void *info, int wait); 103 104 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 105 #define MSG_ALL 0x8001 106 107 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 108 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 109 * when rebooting 110 */ 111 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 112 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 113 114 /* 115 * Mark the boot cpu "online" so that it can call console drivers in 116 * printk() and can access its per-cpu storage. 117 */ 118 void smp_prepare_boot_cpu(void); 119 120 extern unsigned int setup_max_cpus; 121 122 #else /* !SMP */ 123 124 /* 125 * These macros fold the SMP functionality into a single CPU system 126 */ 127 #define raw_smp_processor_id() 0 128 static inline int up_smp_call_function(void (*func)(void *), void *info) 129 { 130 return 0; 131 } 132 #define smp_call_function(func, info, wait) \ 133 (up_smp_call_function(func, info)) 134 #define on_each_cpu(func,info,wait) \ 135 ({ \ 136 local_irq_disable(); \ 137 func(info); \ 138 local_irq_enable(); \ 139 0; \ 140 }) 141 static inline void smp_send_reschedule(int cpu) { } 142 #define num_booting_cpus() 1 143 #define smp_prepare_boot_cpu() do {} while (0) 144 #define smp_call_function_mask(mask, func, info, wait) \ 145 (up_smp_call_function(func, info)) 146 #define smp_call_function_many(mask, func, info, wait) \ 147 (up_smp_call_function(func, info)) 148 static inline void init_call_single_data(void) 149 { 150 } 151 #endif /* !SMP */ 152 153 /* 154 * smp_processor_id(): get the current CPU ID. 155 * 156 * if DEBUG_PREEMPT is enabled the we check whether it is 157 * used in a preemption-safe way. (smp_processor_id() is safe 158 * if it's used in a preemption-off critical section, or in 159 * a thread that is bound to the current CPU.) 160 * 161 * NOTE: raw_smp_processor_id() is for internal use only 162 * (smp_processor_id() is the preferred variant), but in rare 163 * instances it might also be used to turn off false positives 164 * (i.e. smp_processor_id() use that the debugging code reports but 165 * which use for some reason is legal). Don't use this to hack around 166 * the warning message, as your code might not work under PREEMPT. 167 */ 168 #ifdef CONFIG_DEBUG_PREEMPT 169 extern unsigned int debug_smp_processor_id(void); 170 # define smp_processor_id() debug_smp_processor_id() 171 #else 172 # define smp_processor_id() raw_smp_processor_id() 173 #endif 174 175 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 176 #define put_cpu() preempt_enable() 177 #define put_cpu_no_resched() preempt_enable_no_resched() 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