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TOMOYO Linux Cross Reference
Linux/include/linux/smp.h

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  1 #ifndef __LINUX_SMP_H
  2 #define __LINUX_SMP_H
  3 
  4 /*
  5  *      Generic SMP support
  6  *              Alan Cox. <alan@redhat.com>
  7  */
  8 
  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>
 15 
 16 typedef void (*smp_call_func_t)(void *info);
 17 struct call_single_data {
 18         struct llist_node llist;
 19         smp_call_func_t func;
 20         void *info;
 21         unsigned int flags;
 22 };
 23 
 24 /* total number of cpus in this system (may exceed NR_CPUS) */
 25 extern unsigned int total_cpus;
 26 
 27 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
 28                              int wait);
 29 
 30 /*
 31  * Call a function on all processors
 32  */
 33 int on_each_cpu(smp_call_func_t func, void *info, int wait);
 34 
 35 /*
 36  * Call a function on processors specified by mask, which might include
 37  * the local one.
 38  */
 39 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
 40                 void *info, bool wait);
 41 
 42 /*
 43  * Call a function on each processor for which the supplied function
 44  * cond_func returns a positive value. This may include the local
 45  * processor.
 46  */
 47 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
 48                 smp_call_func_t func, void *info, bool wait,
 49                 gfp_t gfp_flags);
 50 
 51 int smp_call_function_single_async(int cpu, struct call_single_data *csd);
 52 
 53 #ifdef CONFIG_SMP
 54 
 55 #include <linux/preempt.h>
 56 #include <linux/kernel.h>
 57 #include <linux/compiler.h>
 58 #include <linux/thread_info.h>
 59 #include <asm/smp.h>
 60 
 61 /*
 62  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
 63  * (defined in asm header):
 64  */
 65 
 66 /*
 67  * stops all CPUs but the current one:
 68  */
 69 extern void smp_send_stop(void);
 70 
 71 /*
 72  * sends a 'reschedule' event to another CPU:
 73  */
 74 extern void smp_send_reschedule(int cpu);
 75 
 76 
 77 /*
 78  * Prepare machine for booting other CPUs.
 79  */
 80 extern void smp_prepare_cpus(unsigned int max_cpus);
 81 
 82 /*
 83  * Bring a CPU up
 84  */
 85 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
 86 
 87 /*
 88  * Final polishing of CPUs
 89  */
 90 extern void smp_cpus_done(unsigned int max_cpus);
 91 
 92 /*
 93  * Call a function on all other processors
 94  */
 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);
 98 
 99 int smp_call_function_any(const struct cpumask *mask,
100                           smp_call_func_t func, void *info, int wait);
101 
102 void kick_all_cpus_sync(void);
103 void wake_up_all_idle_cpus(void);
104 
105 /*
106  * Generic and arch helpers
107  */
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
112 
113 /*
114  * Mark the boot cpu "online" so that it can call console drivers in
115  * printk() and can access its per-cpu storage.
116  */
117 void smp_prepare_boot_cpu(void);
118 
119 extern unsigned int setup_max_cpus;
120 extern void __init setup_nr_cpu_ids(void);
121 extern void __init smp_init(void);
122 
123 #else /* !SMP */
124 
125 static inline void smp_send_stop(void) { }
126 
127 /*
128  *      These macros fold the SMP functionality into a single CPU system
129  */
130 #define raw_smp_processor_id()                  0
131 static inline int up_smp_call_function(smp_call_func_t func, void *info)
132 {
133         return 0;
134 }
135 #define smp_call_function(func, info, wait) \
136                         (up_smp_call_function(func, info))
137 
138 static inline void smp_send_reschedule(int cpu) { }
139 #define smp_prepare_boot_cpu()                  do {} while (0)
140 #define smp_call_function_many(mask, func, info, wait) \
141                         (up_smp_call_function(func, info))
142 static inline void call_function_init(void) { }
143 
144 static inline int
145 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
146                       void *info, int wait)
147 {
148         return smp_call_function_single(0, func, info, wait);
149 }
150 
151 static inline void kick_all_cpus_sync(void) {  }
152 static inline void wake_up_all_idle_cpus(void) {  }
153 
154 #ifdef CONFIG_UP_LATE_INIT
155 extern void __init up_late_init(void);
156 static inline void smp_init(void) { up_late_init(); }
157 #else
158 static inline void smp_init(void) { }
159 #endif
160 
161 #endif /* !SMP */
162 
163 /*
164  * smp_processor_id(): get the current CPU ID.
165  *
166  * if DEBUG_PREEMPT is enabled then we check whether it is
167  * used in a preemption-safe way. (smp_processor_id() is safe
168  * if it's used in a preemption-off critical section, or in
169  * a thread that is bound to the current CPU.)
170  *
171  * NOTE: raw_smp_processor_id() is for internal use only
172  * (smp_processor_id() is the preferred variant), but in rare
173  * instances it might also be used to turn off false positives
174  * (i.e. smp_processor_id() use that the debugging code reports but
175  * which use for some reason is legal). Don't use this to hack around
176  * the warning message, as your code might not work under PREEMPT.
177  */
178 #ifdef CONFIG_DEBUG_PREEMPT
179   extern unsigned int debug_smp_processor_id(void);
180 # define smp_processor_id() debug_smp_processor_id()
181 #else
182 # define smp_processor_id() raw_smp_processor_id()
183 #endif
184 
185 #define get_cpu()               ({ preempt_disable(); smp_processor_id(); })
186 #define put_cpu()               preempt_enable()
187 
188 /*
189  * Callback to arch code if there's nosmp or maxcpus=0 on the
190  * boot command line:
191  */
192 extern void arch_disable_smp_support(void);
193 
194 extern void arch_enable_nonboot_cpus_begin(void);
195 extern void arch_enable_nonboot_cpus_end(void);
196 
197 void smp_setup_processor_id(void);
198 
199 /* SMP core functions */
200 int smpcfd_prepare_cpu(unsigned int cpu);
201 int smpcfd_dead_cpu(unsigned int cpu);
202 int smpcfd_dying_cpu(unsigned int cpu);
203 
204 #endif /* __LINUX_SMP_H */
205 

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