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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/irqflags.h>
 15 
 16 extern void cpu_idle(void);
 17 
 18 typedef void (*smp_call_func_t)(void *info);
 19 struct call_single_data {
 20         struct list_head list;
 21         smp_call_func_t func;
 22         void *info;
 23         u16 flags;
 24 };
 25 
 26 /* total number of cpus in this system (may exceed NR_CPUS) */
 27 extern unsigned int total_cpus;
 28 
 29 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
 30                              int wait);
 31 
 32 #ifdef CONFIG_SMP
 33 
 34 #include <linux/preempt.h>
 35 #include <linux/kernel.h>
 36 #include <linux/compiler.h>
 37 #include <linux/thread_info.h>
 38 #include <asm/smp.h>
 39 
 40 /*
 41  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
 42  * (defined in asm header):
 43  */
 44 
 45 /*
 46  * stops all CPUs but the current one:
 47  */
 48 extern void smp_send_stop(void);
 49 
 50 /*
 51  * sends a 'reschedule' event to another CPU:
 52  */
 53 extern void smp_send_reschedule(int cpu);
 54 
 55 
 56 /*
 57  * Prepare machine for booting other CPUs.
 58  */
 59 extern void smp_prepare_cpus(unsigned int max_cpus);
 60 
 61 /*
 62  * Bring a CPU up
 63  */
 64 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
 65 
 66 /*
 67  * Final polishing of CPUs
 68  */
 69 extern void smp_cpus_done(unsigned int max_cpus);
 70 
 71 /*
 72  * Call a function on all other processors
 73  */
 74 int smp_call_function(smp_call_func_t func, void *info, int wait);
 75 void smp_call_function_many(const struct cpumask *mask,
 76                             smp_call_func_t func, void *info, bool wait);
 77 
 78 void __smp_call_function_single(int cpuid, struct call_single_data *data,
 79                                 int wait);
 80 
 81 int smp_call_function_any(const struct cpumask *mask,
 82                           smp_call_func_t func, void *info, int wait);
 83 
 84 void kick_all_cpus_sync(void);
 85 
 86 /*
 87  * Generic and arch helpers
 88  */
 89 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
 90 void __init call_function_init(void);
 91 void generic_smp_call_function_single_interrupt(void);
 92 #define generic_smp_call_function_interrupt \
 93         generic_smp_call_function_single_interrupt
 94 #else
 95 static inline void call_function_init(void) { }
 96 #endif
 97 
 98 /*
 99  * Call a function on all processors
100  */
101 int on_each_cpu(smp_call_func_t func, void *info, int wait);
102 
103 /*
104  * Call a function on processors specified by mask, which might include
105  * the local one.
106  */
107 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
108                 void *info, bool wait);
109 
110 /*
111  * Call a function on each processor for which the supplied function
112  * cond_func returns a positive value. This may include the local
113  * processor.
114  */
115 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
116                 smp_call_func_t func, void *info, bool wait,
117                 gfp_t gfp_flags);
118 
119 /*
120  * Mark the boot cpu "online" so that it can call console drivers in
121  * printk() and can access its per-cpu storage.
122  */
123 void smp_prepare_boot_cpu(void);
124 
125 extern unsigned int setup_max_cpus;
126 extern void __init setup_nr_cpu_ids(void);
127 extern void __init smp_init(void);
128 
129 #else /* !SMP */
130 
131 static inline void smp_send_stop(void) { }
132 
133 /*
134  *      These macros fold the SMP functionality into a single CPU system
135  */
136 #define raw_smp_processor_id()                  0
137 static inline int up_smp_call_function(smp_call_func_t func, void *info)
138 {
139         return 0;
140 }
141 #define smp_call_function(func, info, wait) \
142                         (up_smp_call_function(func, info))
143 
144 static inline int on_each_cpu(smp_call_func_t func, void *info, int wait)
145 {
146         unsigned long flags;
147 
148         local_irq_save(flags);
149         func(info);
150         local_irq_restore(flags);
151         return 0;
152 }
153 
154 /*
155  * Note we still need to test the mask even for UP
156  * because we actually can get an empty mask from
157  * code that on SMP might call us without the local
158  * CPU in the mask.
159  */
160 #define on_each_cpu_mask(mask, func, info, wait) \
161         do {                                            \
162                 if (cpumask_test_cpu(0, (mask))) {      \
163                         local_irq_disable();            \
164                         (func)(info);                   \
165                         local_irq_enable();             \
166                 }                                       \
167         } while (0)
168 /*
169  * Preemption is disabled here to make sure the cond_func is called under the
170  * same condtions in UP and SMP.
171  */
172 #define on_each_cpu_cond(cond_func, func, info, wait, gfp_flags)\
173         do {                                                    \
174                 void *__info = (info);                          \
175                 preempt_disable();                              \
176                 if ((cond_func)(0, __info)) {                   \
177                         local_irq_disable();                    \
178                         (func)(__info);                         \
179                         local_irq_enable();                     \
180                 }                                               \
181                 preempt_enable();                               \
182         } while (0)
183 
184 static inline void smp_send_reschedule(int cpu) { }
185 #define smp_prepare_boot_cpu()                  do {} while (0)
186 #define smp_call_function_many(mask, func, info, wait) \
187                         (up_smp_call_function(func, info))
188 static inline void call_function_init(void) { }
189 
190 static inline int
191 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
192                       void *info, int wait)
193 {
194         return smp_call_function_single(0, func, info, wait);
195 }
196 
197 static inline void kick_all_cpus_sync(void) {  }
198 
199 #endif /* !SMP */
200 
201 /*
202  * smp_processor_id(): get the current CPU ID.
203  *
204  * if DEBUG_PREEMPT is enabled then we check whether it is
205  * used in a preemption-safe way. (smp_processor_id() is safe
206  * if it's used in a preemption-off critical section, or in
207  * a thread that is bound to the current CPU.)
208  *
209  * NOTE: raw_smp_processor_id() is for internal use only
210  * (smp_processor_id() is the preferred variant), but in rare
211  * instances it might also be used to turn off false positives
212  * (i.e. smp_processor_id() use that the debugging code reports but
213  * which use for some reason is legal). Don't use this to hack around
214  * the warning message, as your code might not work under PREEMPT.
215  */
216 #ifdef CONFIG_DEBUG_PREEMPT
217   extern unsigned int debug_smp_processor_id(void);
218 # define smp_processor_id() debug_smp_processor_id()
219 #else
220 # define smp_processor_id() raw_smp_processor_id()
221 #endif
222 
223 #define get_cpu()               ({ preempt_disable(); smp_processor_id(); })
224 #define put_cpu()               preempt_enable()
225 
226 /*
227  * Callback to arch code if there's nosmp or maxcpus=0 on the
228  * boot command line:
229  */
230 extern void arch_disable_smp_support(void);
231 
232 void smp_setup_processor_id(void);
233 
234 #endif /* __LINUX_SMP_H */
235 

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