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>
14 extern void cpu_idle(void);
16 struct call_single_data {
17 struct list_head list;
18 void (*func) (void *info);
26 #include <linux/preempt.h>
27 #include <linux/kernel.h>
28 #include <linux/compiler.h>
29 #include <linux/thread_info.h>
33 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
34 * (defined in asm header):
38 * stops all CPUs but the current one:
40 extern void smp_send_stop(void);
43 * sends a 'reschedule' event to another CPU:
45 extern void smp_send_reschedule(int cpu);
49 * Prepare machine for booting other CPUs.
51 extern void smp_prepare_cpus(unsigned int max_cpus);
56 extern int __cpu_up(unsigned int cpunum);
59 * Final polishing of CPUs
61 extern void smp_cpus_done(unsigned int max_cpus);
64 * Call a function on all other processors
66 int smp_call_function(void(*func)(void *info), void *info, int wait);
67 /* Deprecated: use smp_call_function_many() which uses a cpumask ptr. */
68 int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
71 static inline void smp_call_function_many(const struct cpumask *mask,
72 void (*func)(void *info), void *info,
75 smp_call_function_mask(*mask, func, info, wait);
78 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
80 void __smp_call_function_single(int cpuid, struct call_single_data *data);
83 * Generic and arch helpers
85 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
86 void generic_smp_call_function_single_interrupt(void);
87 void generic_smp_call_function_interrupt(void);
88 void ipi_call_lock(void);
89 void ipi_call_unlock(void);
90 void ipi_call_lock_irq(void);
91 void ipi_call_unlock_irq(void);
95 * Call a function on all processors
97 int on_each_cpu(void (*func) (void *info), void *info, int wait);
99 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
100 #define MSG_ALL 0x8001
102 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
103 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
106 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
107 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
110 * Mark the boot cpu "online" so that it can call console drivers in
111 * printk() and can access its per-cpu storage.
113 void smp_prepare_boot_cpu(void);
115 extern unsigned int setup_max_cpus;
120 * These macros fold the SMP functionality into a single CPU system
122 #define raw_smp_processor_id() 0
123 static inline int up_smp_call_function(void (*func)(void *), void *info)
127 #define smp_call_function(func, info, wait) \
128 (up_smp_call_function(func, info))
129 #define on_each_cpu(func,info,wait) \
131 local_irq_disable(); \
133 local_irq_enable(); \
136 static inline void smp_send_reschedule(int cpu) { }
137 #define num_booting_cpus() 1
138 #define smp_prepare_boot_cpu() do {} while (0)
139 #define smp_call_function_single(cpuid, func, info, wait) \
141 WARN_ON(cpuid != 0); \
142 local_irq_disable(); \
144 local_irq_enable(); \
147 #define smp_call_function_mask(mask, func, info, wait) \
148 (up_smp_call_function(func, info))
149 #define smp_call_function_many(mask, func, info, wait) \
150 (up_smp_call_function(func, info))
151 static inline void init_call_single_data(void)
157 * smp_processor_id(): get the current CPU ID.
159 * if DEBUG_PREEMPT is enabled the 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()
180 #define put_cpu_no_resched() preempt_enable_no_resched()
182 void smp_setup_processor_id(void);
184 #endif /* __LINUX_SMP_H */