6 * Alan Cox. <alan@redhat.com>
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/list.h>
12 #include <linux/cpumask.h>
13 #include <linux/init.h>
14 #include <linux/irqflags.h>
16 extern void cpu_idle(void);
18 typedef void (*smp_call_func_t)(void *info);
19 struct call_single_data {
20 struct list_head list;
26 /* total number of cpus in this system (may exceed NR_CPUS) */
27 extern unsigned int total_cpus;
29 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
33 * Call a function on processors specified by mask, which might include
36 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
37 void *info, bool wait);
40 * Call a function on each processor for which the supplied function
41 * cond_func returns a positive value. This may include the local
44 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
45 smp_call_func_t func, void *info, bool wait,
50 #include <linux/preempt.h>
51 #include <linux/kernel.h>
52 #include <linux/compiler.h>
53 #include <linux/thread_info.h>
57 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
58 * (defined in asm header):
62 * stops all CPUs but the current one:
64 extern void smp_send_stop(void);
67 * sends a 'reschedule' event to another CPU:
69 extern void smp_send_reschedule(int cpu);
73 * Prepare machine for booting other CPUs.
75 extern void smp_prepare_cpus(unsigned int max_cpus);
80 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
83 * Final polishing of CPUs
85 extern void smp_cpus_done(unsigned int max_cpus);
88 * Call a function on all other processors
90 int smp_call_function(smp_call_func_t func, void *info, int wait);
91 void smp_call_function_many(const struct cpumask *mask,
92 smp_call_func_t func, void *info, bool wait);
94 void __smp_call_function_single(int cpuid, struct call_single_data *data,
97 int smp_call_function_any(const struct cpumask *mask,
98 smp_call_func_t func, void *info, int wait);
100 void kick_all_cpus_sync(void);
103 * Generic and arch helpers
105 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
106 void __init call_function_init(void);
107 void generic_smp_call_function_single_interrupt(void);
108 #define generic_smp_call_function_interrupt \
109 generic_smp_call_function_single_interrupt
111 static inline void call_function_init(void) { }
115 * Call a function on all processors
117 int on_each_cpu(smp_call_func_t func, void *info, int wait);
120 * Mark the boot cpu "online" so that it can call console drivers in
121 * printk() and can access its per-cpu storage.
123 void smp_prepare_boot_cpu(void);
125 extern unsigned int setup_max_cpus;
126 extern void __init setup_nr_cpu_ids(void);
127 extern void __init smp_init(void);
131 static inline void smp_send_stop(void) { }
134 * These macros fold the SMP functionality into a single CPU system
136 #define raw_smp_processor_id() 0
137 static inline int up_smp_call_function(smp_call_func_t func, void *info)
141 #define smp_call_function(func, info, wait) \
142 (up_smp_call_function(func, info))
144 static inline int on_each_cpu(smp_call_func_t func, void *info, int wait)
148 local_irq_save(flags);
150 local_irq_restore(flags);
154 static inline void smp_send_reschedule(int cpu) { }
155 #define smp_prepare_boot_cpu() do {} while (0)
156 #define smp_call_function_many(mask, func, info, wait) \
157 (up_smp_call_function(func, info))
158 static inline void call_function_init(void) { }
161 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
162 void *info, int wait)
164 return smp_call_function_single(0, func, info, wait);
167 static inline void kick_all_cpus_sync(void) { }
172 * smp_processor_id(): get the current CPU ID.
174 * if DEBUG_PREEMPT is enabled then we check whether it is
175 * used in a preemption-safe way. (smp_processor_id() is safe
176 * if it's used in a preemption-off critical section, or in
177 * a thread that is bound to the current CPU.)
179 * NOTE: raw_smp_processor_id() is for internal use only
180 * (smp_processor_id() is the preferred variant), but in rare
181 * instances it might also be used to turn off false positives
182 * (i.e. smp_processor_id() use that the debugging code reports but
183 * which use for some reason is legal). Don't use this to hack around
184 * the warning message, as your code might not work under PREEMPT.
186 #ifdef CONFIG_DEBUG_PREEMPT
187 extern unsigned int debug_smp_processor_id(void);
188 # define smp_processor_id() debug_smp_processor_id()
190 # define smp_processor_id() raw_smp_processor_id()
193 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
194 #define put_cpu() preempt_enable()
197 * Callback to arch code if there's nosmp or maxcpus=0 on the
200 extern void arch_disable_smp_support(void);
202 void smp_setup_processor_id(void);
204 #endif /* __LINUX_SMP_H */