]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/smp.h
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 /* 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
, smp_call_func_t func
, void *info
,
31 * Call a function on all processors
33 int on_each_cpu(smp_call_func_t func
, void *info
, int wait
);
36 * Call a function on processors specified by mask, which might include
39 void on_each_cpu_mask(const struct cpumask
*mask
, smp_call_func_t func
,
40 void *info
, bool wait
);
43 * Call a function on each processor for which the supplied function
44 * cond_func returns a positive value. This may include the local
47 void on_each_cpu_cond(bool (*cond_func
)(int cpu
, void *info
),
48 smp_call_func_t func
, void *info
, bool wait
,
51 int smp_call_function_single_async(int cpu
, struct call_single_data
*csd
);
55 #include <linux/preempt.h>
56 #include <linux/kernel.h>
57 #include <linux/compiler.h>
58 #include <linux/thread_info.h>
62 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
63 * (defined in asm header):
67 * stops all CPUs but the current one:
69 extern void smp_send_stop(void);
72 * sends a 'reschedule' event to another CPU:
74 extern void smp_send_reschedule(int cpu
);
78 * Prepare machine for booting other CPUs.
80 extern void smp_prepare_cpus(unsigned int max_cpus
);
85 extern int __cpu_up(unsigned int cpunum
, struct task_struct
*tidle
);
88 * Final polishing of CPUs
90 extern void smp_cpus_done(unsigned int max_cpus
);
93 * Call a function on all other processors
95 int smp_call_function(smp_call_func_t func
, void *info
, int wait
);
96 void smp_call_function_many(const struct cpumask
*mask
,
97 smp_call_func_t func
, void *info
, bool wait
);
99 int smp_call_function_any(const struct cpumask
*mask
,
100 smp_call_func_t func
, void *info
, int wait
);
102 void kick_all_cpus_sync(void);
103 void wake_up_all_idle_cpus(void);
106 * Generic and arch helpers
108 void __init
call_function_init(void);
109 void generic_smp_call_function_single_interrupt(void);
110 #define generic_smp_call_function_interrupt \
111 generic_smp_call_function_single_interrupt
114 * Mark the boot cpu "online" so that it can call console drivers in
115 * printk() and can access its per-cpu storage.
117 void smp_prepare_boot_cpu(void);
119 extern unsigned int setup_max_cpus
;
120 extern void __init
setup_nr_cpu_ids(void);
121 extern void __init
smp_init(void);
123 extern int __boot_cpu_id
;
125 static inline int get_boot_cpu_id(void)
127 return __boot_cpu_id
;
132 static inline void smp_send_stop(void) { }
135 * These macros fold the SMP functionality into a single CPU system
137 #define raw_smp_processor_id() 0
138 static inline int up_smp_call_function(smp_call_func_t func
, void *info
)
142 #define smp_call_function(func, info, wait) \
143 (up_smp_call_function(func, info))
145 static inline void smp_send_reschedule(int cpu
) { }
146 #define smp_prepare_boot_cpu() do {} while (0)
147 #define smp_call_function_many(mask, func, info, wait) \
148 (up_smp_call_function(func, info))
149 static inline void call_function_init(void) { }
152 smp_call_function_any(const struct cpumask
*mask
, smp_call_func_t func
,
153 void *info
, int wait
)
155 return smp_call_function_single(0, func
, info
, wait
);
158 static inline void kick_all_cpus_sync(void) { }
159 static inline void wake_up_all_idle_cpus(void) { }
161 #ifdef CONFIG_UP_LATE_INIT
162 extern void __init
up_late_init(void);
163 static inline void smp_init(void) { up_late_init(); }
165 static inline void smp_init(void) { }
168 static inline int get_boot_cpu_id(void)
176 * smp_processor_id(): get the current CPU ID.
178 * if DEBUG_PREEMPT is enabled then we check whether it is
179 * used in a preemption-safe way. (smp_processor_id() is safe
180 * if it's used in a preemption-off critical section, or in
181 * a thread that is bound to the current CPU.)
183 * NOTE: raw_smp_processor_id() is for internal use only
184 * (smp_processor_id() is the preferred variant), but in rare
185 * instances it might also be used to turn off false positives
186 * (i.e. smp_processor_id() use that the debugging code reports but
187 * which use for some reason is legal). Don't use this to hack around
188 * the warning message, as your code might not work under PREEMPT.
190 #ifdef CONFIG_DEBUG_PREEMPT
191 extern unsigned int debug_smp_processor_id(void);
192 # define smp_processor_id() debug_smp_processor_id()
194 # define smp_processor_id() raw_smp_processor_id()
197 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
198 #define put_cpu() preempt_enable()
201 * Callback to arch code if there's nosmp or maxcpus=0 on the
204 extern void arch_disable_smp_support(void);
206 extern void arch_enable_nonboot_cpus_begin(void);
207 extern void arch_enable_nonboot_cpus_end(void);
209 void smp_setup_processor_id(void);
211 int smp_call_on_cpu(unsigned int cpu
, int (*func
)(void *), void *par
,
214 /* SMP core functions */
215 int smpcfd_prepare_cpu(unsigned int cpu
);
216 int smpcfd_dead_cpu(unsigned int cpu
);
217 int smpcfd_dying_cpu(unsigned int cpu
);
219 #endif /* __LINUX_SMP_H */