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>
15 extern void cpu_idle(void);
17 typedef void (*smp_call_func_t
)(void *info
);
18 struct call_single_data
{
19 struct list_head list
;
25 /* total number of cpus in this system (may exceed NR_CPUS) */
26 extern unsigned int total_cpus
;
28 int smp_call_function_single(int cpuid
, smp_call_func_t func
, void *info
,
32 * Call a function on all processors
34 int on_each_cpu(smp_call_func_t func
, void *info
, int wait
);
37 * Call a function on processors specified by mask, which might include
40 void on_each_cpu_mask(const struct cpumask
*mask
, smp_call_func_t func
,
41 void *info
, bool wait
);
44 * Call a function on each processor for which the supplied function
45 * cond_func returns a positive value. This may include the local
48 void on_each_cpu_cond(bool (*cond_func
)(int cpu
, void *info
),
49 smp_call_func_t func
, void *info
, bool wait
,
52 void __smp_call_function_single(int cpuid
, struct call_single_data
*data
,
57 #include <linux/preempt.h>
58 #include <linux/kernel.h>
59 #include <linux/compiler.h>
60 #include <linux/thread_info.h>
64 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
65 * (defined in asm header):
69 * stops all CPUs but the current one:
71 extern void smp_send_stop(void);
74 * sends a 'reschedule' event to another CPU:
76 extern void smp_send_reschedule(int cpu
);
80 * Prepare machine for booting other CPUs.
82 extern void smp_prepare_cpus(unsigned int max_cpus
);
87 extern int __cpu_up(unsigned int cpunum
, struct task_struct
*tidle
);
90 * Final polishing of CPUs
92 extern void smp_cpus_done(unsigned int max_cpus
);
95 * Call a function on all other processors
97 int smp_call_function(smp_call_func_t func
, void *info
, int wait
);
98 void smp_call_function_many(const struct cpumask
*mask
,
99 smp_call_func_t func
, void *info
, bool wait
);
101 int smp_call_function_any(const struct cpumask
*mask
,
102 smp_call_func_t func
, void *info
, int wait
);
104 void kick_all_cpus_sync(void);
107 * Generic and arch helpers
109 void __init
call_function_init(void);
110 void generic_smp_call_function_single_interrupt(void);
111 #define generic_smp_call_function_interrupt \
112 generic_smp_call_function_single_interrupt
115 * Mark the boot cpu "online" so that it can call console drivers in
116 * printk() and can access its per-cpu storage.
118 void smp_prepare_boot_cpu(void);
120 extern unsigned int setup_max_cpus
;
121 extern void __init
setup_nr_cpu_ids(void);
122 extern void __init
smp_init(void);
126 static inline void smp_send_stop(void) { }
129 * These macros fold the SMP functionality into a single CPU system
131 #define raw_smp_processor_id() 0
132 static inline int up_smp_call_function(smp_call_func_t func
, void *info
)
136 #define smp_call_function(func, info, wait) \
137 (up_smp_call_function(func, info))
139 static inline void smp_send_reschedule(int cpu
) { }
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 call_function_init(void) { }
146 smp_call_function_any(const struct cpumask
*mask
, smp_call_func_t func
,
147 void *info
, int wait
)
149 return smp_call_function_single(0, func
, info
, wait
);
152 static inline void kick_all_cpus_sync(void) { }
157 * smp_processor_id(): get the current CPU ID.
159 * if DEBUG_PREEMPT is enabled then we check whether it is
160 * used in a preemption-safe way. (smp_processor_id() is safe
161 * if it's used in a preemption-off critical section, or in
162 * a thread that is bound to the current CPU.)
164 * NOTE: raw_smp_processor_id() is for internal use only
165 * (smp_processor_id() is the preferred variant), but in rare
166 * instances it might also be used to turn off false positives
167 * (i.e. smp_processor_id() use that the debugging code reports but
168 * which use for some reason is legal). Don't use this to hack around
169 * the warning message, as your code might not work under PREEMPT.
171 #ifdef CONFIG_DEBUG_PREEMPT
172 extern unsigned int debug_smp_processor_id(void);
173 # define smp_processor_id() debug_smp_processor_id()
175 # define smp_processor_id() raw_smp_processor_id()
178 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
179 #define put_cpu() preempt_enable()
182 * Callback to arch code if there's nosmp or maxcpus=0 on the
185 extern void arch_disable_smp_support(void);
187 void smp_setup_processor_id(void);
189 #endif /* __LINUX_SMP_H */
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