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/llist.h>
16 typedef void (*smp_call_func_t)(void *info);
17 struct __call_single_data {
18 struct llist_node llist;
24 /* Use __aligned() to avoid to use 2 cache lines for 1 csd */
25 typedef struct __call_single_data call_single_data_t
26 __aligned(sizeof(struct __call_single_data));
28 /* total number of cpus in this system (may exceed NR_CPUS) */
29 extern unsigned int total_cpus;
31 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
35 * Call a function on all processors
37 int on_each_cpu(smp_call_func_t func, void *info, int wait);
40 * Call a function on processors specified by mask, which might include
43 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
44 void *info, bool wait);
47 * Call a function on each processor for which the supplied function
48 * cond_func returns a positive value. This may include the local
51 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
52 smp_call_func_t func, void *info, bool wait,
55 int smp_call_function_single_async(int cpu, call_single_data_t *csd);
59 #include <linux/preempt.h>
60 #include <linux/kernel.h>
61 #include <linux/compiler.h>
62 #include <linux/thread_info.h>
66 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
67 * (defined in asm header):
71 * stops all CPUs but the current one:
73 extern void smp_send_stop(void);
76 * sends a 'reschedule' event to another CPU:
78 extern void smp_send_reschedule(int cpu);
82 * Prepare machine for booting other CPUs.
84 extern void smp_prepare_cpus(unsigned int max_cpus);
89 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
92 * Final polishing of CPUs
94 extern void smp_cpus_done(unsigned int max_cpus);
97 * Call a function on all other processors
99 int smp_call_function(smp_call_func_t func, void *info, int wait);
100 void smp_call_function_many(const struct cpumask *mask,
101 smp_call_func_t func, void *info, bool wait);
103 int smp_call_function_any(const struct cpumask *mask,
104 smp_call_func_t func, void *info, int wait);
106 void kick_all_cpus_sync(void);
107 void wake_up_all_idle_cpus(void);
110 * Generic and arch helpers
112 void __init call_function_init(void);
113 void generic_smp_call_function_single_interrupt(void);
114 #define generic_smp_call_function_interrupt \
115 generic_smp_call_function_single_interrupt
118 * Mark the boot cpu "online" so that it can call console drivers in
119 * printk() and can access its per-cpu storage.
121 void smp_prepare_boot_cpu(void);
123 extern unsigned int setup_max_cpus;
124 extern void __init setup_nr_cpu_ids(void);
125 extern void __init smp_init(void);
127 extern int __boot_cpu_id;
129 static inline int get_boot_cpu_id(void)
131 return __boot_cpu_id;
136 static inline void smp_send_stop(void) { }
139 * These macros fold the SMP functionality into a single CPU system
141 #define raw_smp_processor_id() 0
142 static inline int up_smp_call_function(smp_call_func_t func, void *info)
146 #define smp_call_function(func, info, wait) \
147 (up_smp_call_function(func, info))
149 static inline void smp_send_reschedule(int cpu) { }
150 #define smp_prepare_boot_cpu() do {} while (0)
151 #define smp_call_function_many(mask, func, info, wait) \
152 (up_smp_call_function(func, info))
153 static inline void call_function_init(void) { }
156 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
157 void *info, int wait)
159 return smp_call_function_single(0, func, info, wait);
162 static inline void kick_all_cpus_sync(void) { }
163 static inline void wake_up_all_idle_cpus(void) { }
165 #ifdef CONFIG_UP_LATE_INIT
166 extern void __init up_late_init(void);
167 static inline void smp_init(void) { up_late_init(); }
169 static inline void smp_init(void) { }
172 static inline int get_boot_cpu_id(void)
180 * smp_processor_id(): get the current CPU ID.
182 * if DEBUG_PREEMPT is enabled then we check whether it is
183 * used in a preemption-safe way. (smp_processor_id() is safe
184 * if it's used in a preemption-off critical section, or in
185 * a thread that is bound to the current CPU.)
187 * NOTE: raw_smp_processor_id() is for internal use only
188 * (smp_processor_id() is the preferred variant), but in rare
189 * instances it might also be used to turn off false positives
190 * (i.e. smp_processor_id() use that the debugging code reports but
191 * which use for some reason is legal). Don't use this to hack around
192 * the warning message, as your code might not work under PREEMPT.
194 #ifdef CONFIG_DEBUG_PREEMPT
195 extern unsigned int debug_smp_processor_id(void);
196 # define smp_processor_id() debug_smp_processor_id()
198 # define smp_processor_id() raw_smp_processor_id()
201 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
202 #define put_cpu() preempt_enable()
205 * Callback to arch code if there's nosmp or maxcpus=0 on the
208 extern void arch_disable_smp_support(void);
210 extern void arch_enable_nonboot_cpus_begin(void);
211 extern void arch_enable_nonboot_cpus_end(void);
213 void smp_setup_processor_id(void);
215 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
218 /* SMP core functions */
219 int smpcfd_prepare_cpu(unsigned int cpu);
220 int smpcfd_dead_cpu(unsigned int cpu);
221 int smpcfd_dying_cpu(unsigned int cpu);
223 #endif /* __LINUX_SMP_H */