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
;
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
,
34 #include <linux/preempt.h>
35 #include <linux/kernel.h>
36 #include <linux/compiler.h>
37 #include <linux/thread_info.h>
41 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
42 * (defined in asm header):
46 * stops all CPUs but the current one:
48 extern void smp_send_stop(void);
51 * sends a 'reschedule' event to another CPU:
53 extern void smp_send_reschedule(int cpu
);
57 * Prepare machine for booting other CPUs.
59 extern void smp_prepare_cpus(unsigned int max_cpus
);
64 extern int __cpu_up(unsigned int cpunum
);
67 * Final polishing of CPUs
69 extern void smp_cpus_done(unsigned int max_cpus
);
72 * Call a function on all other processors
74 int smp_call_function(smp_call_func_t func
, void *info
, int wait
);
75 void smp_call_function_many(const struct cpumask
*mask
,
76 smp_call_func_t func
, void *info
, bool wait
);
78 void __smp_call_function_single(int cpuid
, struct call_single_data
*data
,
81 int smp_call_function_any(const struct cpumask
*mask
,
82 smp_call_func_t func
, void *info
, int wait
);
85 * Generic and arch helpers
87 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
88 void __init
call_function_init(void);
89 void generic_smp_call_function_single_interrupt(void);
90 void generic_smp_call_function_interrupt(void);
91 void ipi_call_lock(void);
92 void ipi_call_unlock(void);
93 void ipi_call_lock_irq(void);
94 void ipi_call_unlock_irq(void);
96 static inline void call_function_init(void) { }
100 * Call a function on all processors
102 int on_each_cpu(smp_call_func_t func
, void *info
, int wait
);
105 * Mark the boot cpu "online" so that it can call console drivers in
106 * printk() and can access its per-cpu storage.
108 void smp_prepare_boot_cpu(void);
110 extern unsigned int setup_max_cpus
;
111 extern void __init
setup_nr_cpu_ids(void);
112 extern void __init
smp_init(void);
116 static inline void smp_send_stop(void) { }
119 * These macros fold the SMP functionality into a single CPU system
121 #define raw_smp_processor_id() 0
122 static inline int up_smp_call_function(smp_call_func_t func
, void *info
)
126 #define smp_call_function(func, info, wait) \
127 (up_smp_call_function(func, info))
128 #define on_each_cpu(func,info,wait) \
130 local_irq_disable(); \
132 local_irq_enable(); \
135 static inline void smp_send_reschedule(int cpu
) { }
136 #define num_booting_cpus() 1
137 #define smp_prepare_boot_cpu() do {} while (0)
138 #define smp_call_function_many(mask, func, info, wait) \
139 (up_smp_call_function(func, info))
140 static inline void call_function_init(void) { }
143 smp_call_function_any(const struct cpumask
*mask
, smp_call_func_t func
,
144 void *info
, int wait
)
146 return smp_call_function_single(0, func
, info
, wait
);
152 * smp_processor_id(): get the current CPU ID.
154 * if DEBUG_PREEMPT is enabled then we check whether it is
155 * used in a preemption-safe way. (smp_processor_id() is safe
156 * if it's used in a preemption-off critical section, or in
157 * a thread that is bound to the current CPU.)
159 * NOTE: raw_smp_processor_id() is for internal use only
160 * (smp_processor_id() is the preferred variant), but in rare
161 * instances it might also be used to turn off false positives
162 * (i.e. smp_processor_id() use that the debugging code reports but
163 * which use for some reason is legal). Don't use this to hack around
164 * the warning message, as your code might not work under PREEMPT.
166 #ifdef CONFIG_DEBUG_PREEMPT
167 extern unsigned int debug_smp_processor_id(void);
168 # define smp_processor_id() debug_smp_processor_id()
170 # define smp_processor_id() raw_smp_processor_id()
173 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
174 #define put_cpu() preempt_enable()
177 * Callback to arch code if there's nosmp or maxcpus=0 on the
180 extern void arch_disable_smp_support(void);
182 void smp_setup_processor_id(void);
184 #endif /* __LINUX_SMP_H */
This page took 0.033515 seconds and 5 git commands to generate.