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);
24 /* total number of cpus in this system (may exceed NR_CPUS) */
25 extern unsigned int total_cpus;
27 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
32 #include <linux/preempt.h>
33 #include <linux/kernel.h>
34 #include <linux/compiler.h>
35 #include <linux/thread_info.h>
39 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
40 * (defined in asm header):
44 * stops all CPUs but the current one:
46 extern void smp_send_stop(void);
49 * sends a 'reschedule' event to another CPU:
51 extern void smp_send_reschedule(int cpu);
55 * Prepare machine for booting other CPUs.
57 extern void smp_prepare_cpus(unsigned int max_cpus);
62 extern int __cpu_up(unsigned int cpunum);
65 * Final polishing of CPUs
67 extern void smp_cpus_done(unsigned int max_cpus);
70 * Callback to arch code if there's nosmp or maxcpus=0 on the
73 extern void arch_disable_smp_support(void);
76 * Call a function on all other processors
78 int smp_call_function(void(*func)(void *info), void *info, int wait);
79 void smp_call_function_many(const struct cpumask *mask,
80 void (*func)(void *info), void *info, bool wait);
82 /* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */
84 smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
87 smp_call_function_many(&mask, func, info, wait);
91 void __smp_call_function_single(int cpuid, struct call_single_data *data);
94 * Generic and arch helpers
96 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
97 void generic_smp_call_function_single_interrupt(void);
98 void generic_smp_call_function_interrupt(void);
99 void ipi_call_lock(void);
100 void ipi_call_unlock(void);
101 void ipi_call_lock_irq(void);
102 void ipi_call_unlock_irq(void);
106 * Call a function on all processors
108 int on_each_cpu(void (*func) (void *info), void *info, int wait);
110 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
111 #define MSG_ALL 0x8001
113 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
114 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
117 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
118 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
121 * Mark the boot cpu "online" so that it can call console drivers in
122 * printk() and can access its per-cpu storage.
124 void smp_prepare_boot_cpu(void);
126 extern unsigned int setup_max_cpus;
131 * These macros fold the SMP functionality into a single CPU system
133 #define raw_smp_processor_id() 0
134 static inline int up_smp_call_function(void (*func)(void *), void *info)
138 #define smp_call_function(func, info, wait) \
139 (up_smp_call_function(func, info))
140 #define on_each_cpu(func,info,wait) \
142 local_irq_disable(); \
144 local_irq_enable(); \
147 static inline void smp_send_reschedule(int cpu) { }
148 #define num_booting_cpus() 1
149 #define smp_prepare_boot_cpu() do {} while (0)
150 #define smp_call_function_mask(mask, func, info, wait) \
151 (up_smp_call_function(func, info))
152 #define smp_call_function_many(mask, func, info, wait) \
153 (up_smp_call_function(func, info))
154 static inline void init_call_single_data(void)
160 * smp_processor_id(): get the current CPU ID.
162 * if DEBUG_PREEMPT is enabled the we check whether it is
163 * used in a preemption-safe way. (smp_processor_id() is safe
164 * if it's used in a preemption-off critical section, or in
165 * a thread that is bound to the current CPU.)
167 * NOTE: raw_smp_processor_id() is for internal use only
168 * (smp_processor_id() is the preferred variant), but in rare
169 * instances it might also be used to turn off false positives
170 * (i.e. smp_processor_id() use that the debugging code reports but
171 * which use for some reason is legal). Don't use this to hack around
172 * the warning message, as your code might not work under PREEMPT.
174 #ifdef CONFIG_DEBUG_PREEMPT
175 extern unsigned int debug_smp_processor_id(void);
176 # define smp_processor_id() debug_smp_processor_id()
178 # define smp_processor_id() raw_smp_processor_id()
181 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
182 #define put_cpu() preempt_enable()
183 #define put_cpu_no_resched() preempt_enable_no_resched()
185 void smp_setup_processor_id(void);
187 #endif /* __LINUX_SMP_H */