]>
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 extern void cpu_idle(void);
18 typedef void (*smp_call_func_t
)(void *info
);
19 struct call_single_data
{
21 struct list_head list
;
22 struct llist_node llist
;
29 /* total number of cpus in this system (may exceed NR_CPUS) */
30 extern unsigned int total_cpus
;
32 int smp_call_function_single(int cpuid
, smp_call_func_t func
, void *info
,
36 * Call a function on all processors
38 int on_each_cpu(smp_call_func_t func
, void *info
, int wait
);
41 * Call a function on processors specified by mask, which might include
44 void on_each_cpu_mask(const struct cpumask
*mask
, smp_call_func_t func
,
45 void *info
, bool wait
);
48 * Call a function on each processor for which the supplied function
49 * cond_func returns a positive value. This may include the local
52 void on_each_cpu_cond(bool (*cond_func
)(int cpu
, void *info
),
53 smp_call_func_t func
, void *info
, bool wait
,
56 void __smp_call_function_single(int cpuid
, struct call_single_data
*data
,
61 #include <linux/preempt.h>
62 #include <linux/kernel.h>
63 #include <linux/compiler.h>
64 #include <linux/thread_info.h>
68 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
69 * (defined in asm header):
73 * stops all CPUs but the current one:
75 extern void smp_send_stop(void);
78 * sends a 'reschedule' event to another CPU:
80 extern void smp_send_reschedule(int cpu
);
84 * Prepare machine for booting other CPUs.
86 extern void smp_prepare_cpus(unsigned int max_cpus
);
91 extern int __cpu_up(unsigned int cpunum
, struct task_struct
*tidle
);
94 * Final polishing of CPUs
96 extern void smp_cpus_done(unsigned int max_cpus
);
99 * Call a function on all other processors
101 int smp_call_function(smp_call_func_t func
, void *info
, int wait
);
102 void smp_call_function_many(const struct cpumask
*mask
,
103 smp_call_func_t func
, void *info
, bool wait
);
105 int smp_call_function_any(const struct cpumask
*mask
,
106 smp_call_func_t func
, void *info
, int wait
);
108 void kick_all_cpus_sync(void);
111 * Generic and arch helpers
113 void __init
call_function_init(void);
114 void generic_smp_call_function_single_interrupt(void);
115 #define generic_smp_call_function_interrupt \
116 generic_smp_call_function_single_interrupt
119 * Mark the boot cpu "online" so that it can call console drivers in
120 * printk() and can access its per-cpu storage.
122 void smp_prepare_boot_cpu(void);
124 extern unsigned int setup_max_cpus
;
125 extern void __init
setup_nr_cpu_ids(void);
126 extern void __init
smp_init(void);
130 static inline void smp_send_stop(void) { }
133 * These macros fold the SMP functionality into a single CPU system
135 #define raw_smp_processor_id() 0
136 static inline int up_smp_call_function(smp_call_func_t func
, void *info
)
140 #define smp_call_function(func, info, wait) \
141 (up_smp_call_function(func, info))
143 static inline void smp_send_reschedule(int cpu
) { }
144 #define smp_prepare_boot_cpu() do {} while (0)
145 #define smp_call_function_many(mask, func, info, wait) \
146 (up_smp_call_function(func, info))
147 static inline void call_function_init(void) { }
150 smp_call_function_any(const struct cpumask
*mask
, smp_call_func_t func
,
151 void *info
, int wait
)
153 return smp_call_function_single(0, func
, info
, wait
);
156 static inline void kick_all_cpus_sync(void) { }
161 * smp_processor_id(): get the current CPU ID.
163 * if DEBUG_PREEMPT is enabled then we check whether it is
164 * used in a preemption-safe way. (smp_processor_id() is safe
165 * if it's used in a preemption-off critical section, or in
166 * a thread that is bound to the current CPU.)
168 * NOTE: raw_smp_processor_id() is for internal use only
169 * (smp_processor_id() is the preferred variant), but in rare
170 * instances it might also be used to turn off false positives
171 * (i.e. smp_processor_id() use that the debugging code reports but
172 * which use for some reason is legal). Don't use this to hack around
173 * the warning message, as your code might not work under PREEMPT.
175 #ifdef CONFIG_DEBUG_PREEMPT
176 extern unsigned int debug_smp_processor_id(void);
177 # define smp_processor_id() debug_smp_processor_id()
179 # define smp_processor_id() raw_smp_processor_id()
182 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
183 #define put_cpu() preempt_enable()
186 * Callback to arch code if there's nosmp or maxcpus=0 on the
189 extern void arch_disable_smp_support(void);
191 extern void arch_enable_nonboot_cpus_begin(void);
192 extern void arch_enable_nonboot_cpus_end(void);
194 void smp_setup_processor_id(void);
196 #endif /* __LINUX_SMP_H */