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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | #ifndef __LINUX_SMP_H #define __LINUX_SMP_H /* * Generic SMP support * Alan Cox. <alan@redhat.com> */ #include <linux/errno.h> #include <linux/types.h> #include <linux/list.h> #include <linux/cpumask.h> #include <linux/init.h> extern void cpu_idle(void); typedef void (*smp_call_func_t)(void *info); struct call_single_data { struct list_head list; smp_call_func_t func; void *info; u16 flags; u16 priv; }; /* total number of cpus in this system (may exceed NR_CPUS) */ extern unsigned int total_cpus; int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, int wait); #ifdef CONFIG_SMP #include <linux/preempt.h> #include <linux/kernel.h> #include <linux/compiler.h> #include <linux/thread_info.h> #include <asm/smp.h> /* * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. * (defined in asm header): */ /* * stops all CPUs but the current one: */ extern void smp_send_stop(void); /* * sends a 'reschedule' event to another CPU: */ extern void smp_send_reschedule(int cpu); /* * Prepare machine for booting other CPUs. */ extern void smp_prepare_cpus(unsigned int max_cpus); /* * Bring a CPU up */ extern int __cpu_up(unsigned int cpunum); /* * Final polishing of CPUs */ extern void smp_cpus_done(unsigned int max_cpus); /* * Call a function on all other processors */ int smp_call_function(smp_call_func_t func, void *info, int wait); void smp_call_function_many(const struct cpumask *mask, smp_call_func_t func, void *info, bool wait); void __smp_call_function_single(int cpuid, struct call_single_data *data, int wait); int smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, void *info, int wait); /* * Generic and arch helpers */ #ifdef CONFIG_USE_GENERIC_SMP_HELPERS void __init call_function_init(void); void generic_smp_call_function_single_interrupt(void); void generic_smp_call_function_interrupt(void); void ipi_call_lock(void); void ipi_call_unlock(void); void ipi_call_lock_irq(void); void ipi_call_unlock_irq(void); #else static inline void call_function_init(void) { } #endif /* * Call a function on all processors */ int on_each_cpu(smp_call_func_t func, void *info, int wait); /* * Mark the boot cpu "online" so that it can call console drivers in * printk() and can access its per-cpu storage. */ void smp_prepare_boot_cpu(void); extern unsigned int setup_max_cpus; extern void __init setup_nr_cpu_ids(void); extern void __init smp_init(void); #else /* !SMP */ static inline void smp_send_stop(void) { } /* * These macros fold the SMP functionality into a single CPU system */ #define raw_smp_processor_id() 0 static inline int up_smp_call_function(smp_call_func_t func, void *info) { return 0; } #define smp_call_function(func, info, wait) \ (up_smp_call_function(func, info)) #define on_each_cpu(func,info,wait) \ ({ \ local_irq_disable(); \ func(info); \ local_irq_enable(); \ 0; \ }) static inline void smp_send_reschedule(int cpu) { } #define num_booting_cpus() 1 #define smp_prepare_boot_cpu() do {} while (0) #define smp_call_function_many(mask, func, info, wait) \ (up_smp_call_function(func, info)) static inline void call_function_init(void) { } static inline int smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, void *info, int wait) { return smp_call_function_single(0, func, info, wait); } #endif /* !SMP */ /* * smp_processor_id(): get the current CPU ID. * * if DEBUG_PREEMPT is enabled then we check whether it is * used in a preemption-safe way. (smp_processor_id() is safe * if it's used in a preemption-off critical section, or in * a thread that is bound to the current CPU.) * * NOTE: raw_smp_processor_id() is for internal use only * (smp_processor_id() is the preferred variant), but in rare * instances it might also be used to turn off false positives * (i.e. smp_processor_id() use that the debugging code reports but * which use for some reason is legal). Don't use this to hack around * the warning message, as your code might not work under PREEMPT. */ #ifdef CONFIG_DEBUG_PREEMPT extern unsigned int debug_smp_processor_id(void); # define smp_processor_id() debug_smp_processor_id() #else # define smp_processor_id() raw_smp_processor_id() #endif #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) #define put_cpu() preempt_enable() /* * Callback to arch code if there's nosmp or maxcpus=0 on the * boot command line: */ extern void arch_disable_smp_support(void); void smp_setup_processor_id(void); #endif /* __LINUX_SMP_H */ |