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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __LINUX_SMP_H
  3 #define __LINUX_SMP_H
  4 
  5 /*
  6  *      Generic SMP support
  7  *              Alan Cox. <alan@redhat.com>
  8  */
  9 
 10 #include <linux/errno.h>
 11 #include <linux/types.h>
 12 #include <linux/list.h>
 13 #include <linux/cpumask.h>
 14 #include <linux/init.h>
 15 #include <linux/llist.h>
 16 
 17 typedef void (*smp_call_func_t)(void *info);
 18 struct __call_single_data {
 19         struct llist_node llist;
 20         smp_call_func_t func;
 21         void *info;
 22         unsigned int flags;
 23 };
 24 
 25 /* Use __aligned() to avoid to use 2 cache lines for 1 csd */
 26 typedef struct __call_single_data call_single_data_t
 27         __aligned(sizeof(struct __call_single_data));
 28 
 29 /* total number of cpus in this system (may exceed NR_CPUS) */
 30 extern unsigned int total_cpus;
 31 
 32 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
 33                              int wait);
 34 
 35 /*
 36  * Call a function on all processors
 37  */
 38 int on_each_cpu(smp_call_func_t func, void *info, int wait);
 39 
 40 /*
 41  * Call a function on processors specified by mask, which might include
 42  * the local one.
 43  */
 44 void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
 45                 void *info, bool wait);
 46 
 47 /*
 48  * Call a function on each processor for which the supplied function
 49  * cond_func returns a positive value. This may include the local
 50  * processor.
 51  */
 52 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
 53                 smp_call_func_t func, void *info, bool wait,
 54                 gfp_t gfp_flags);
 55 
 56 void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info),
 57                 smp_call_func_t func, void *info, bool wait,
 58                 gfp_t gfp_flags, const struct cpumask *mask);
 59 
 60 int smp_call_function_single_async(int cpu, call_single_data_t *csd);
 61 
 62 #ifdef CONFIG_SMP
 63 
 64 #include <linux/preempt.h>
 65 #include <linux/kernel.h>
 66 #include <linux/compiler.h>
 67 #include <linux/thread_info.h>
 68 #include <asm/smp.h>
 69 
 70 /*
 71  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
 72  * (defined in asm header):
 73  */
 74 
 75 /*
 76  * stops all CPUs but the current one:
 77  */
 78 extern void smp_send_stop(void);
 79 
 80 /*
 81  * sends a 'reschedule' event to another CPU:
 82  */
 83 extern void smp_send_reschedule(int cpu);
 84 
 85 
 86 /*
 87  * Prepare machine for booting other CPUs.
 88  */
 89 extern void smp_prepare_cpus(unsigned int max_cpus);
 90 
 91 /*
 92  * Bring a CPU up
 93  */
 94 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
 95 
 96 /*
 97  * Final polishing of CPUs
 98  */
 99 extern void smp_cpus_done(unsigned int max_cpus);
100 
101 /*
102  * Call a function on all other processors
103  */
104 int smp_call_function(smp_call_func_t func, void *info, int wait);
105 void smp_call_function_many(const struct cpumask *mask,
106                             smp_call_func_t func, void *info, bool wait);
107 
108 int smp_call_function_any(const struct cpumask *mask,
109                           smp_call_func_t func, void *info, int wait);
110 
111 void kick_all_cpus_sync(void);
112 void wake_up_all_idle_cpus(void);
113 
114 /*
115  * Generic and arch helpers
116  */
117 void __init call_function_init(void);
118 void generic_smp_call_function_single_interrupt(void);
119 #define generic_smp_call_function_interrupt \
120         generic_smp_call_function_single_interrupt
121 
122 /*
123  * Mark the boot cpu "online" so that it can call console drivers in
124  * printk() and can access its per-cpu storage.
125  */
126 void smp_prepare_boot_cpu(void);
127 
128 extern unsigned int setup_max_cpus;
129 extern void __init setup_nr_cpu_ids(void);
130 extern void __init smp_init(void);
131 
132 extern int __boot_cpu_id;
133 
134 static inline int get_boot_cpu_id(void)
135 {
136         return __boot_cpu_id;
137 }
138 
139 #else /* !SMP */
140 
141 static inline void smp_send_stop(void) { }
142 
143 /*
144  *      These macros fold the SMP functionality into a single CPU system
145  */
146 #define raw_smp_processor_id()                  0
147 static inline int up_smp_call_function(smp_call_func_t func, void *info)
148 {
149         return 0;
150 }
151 #define smp_call_function(func, info, wait) \
152                         (up_smp_call_function(func, info))
153 
154 static inline void smp_send_reschedule(int cpu) { }
155 #define smp_prepare_boot_cpu()                  do {} while (0)
156 #define smp_call_function_many(mask, func, info, wait) \
157                         (up_smp_call_function(func, info))
158 static inline void call_function_init(void) { }
159 
160 static inline int
161 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
162                       void *info, int wait)
163 {
164         return smp_call_function_single(0, func, info, wait);
165 }
166 
167 static inline void kick_all_cpus_sync(void) {  }
168 static inline void wake_up_all_idle_cpus(void) {  }
169 
170 #ifdef CONFIG_UP_LATE_INIT
171 extern void __init up_late_init(void);
172 static inline void smp_init(void) { up_late_init(); }
173 #else
174 static inline void smp_init(void) { }
175 #endif
176 
177 static inline int get_boot_cpu_id(void)
178 {
179         return 0;
180 }
181 
182 #endif /* !SMP */
183 
184 /*
185  * smp_processor_id(): get the current CPU ID.
186  *
187  * if DEBUG_PREEMPT is enabled then we check whether it is
188  * used in a preemption-safe way. (smp_processor_id() is safe
189  * if it's used in a preemption-off critical section, or in
190  * a thread that is bound to the current CPU.)
191  *
192  * NOTE: raw_smp_processor_id() is for internal use only
193  * (smp_processor_id() is the preferred variant), but in rare
194  * instances it might also be used to turn off false positives
195  * (i.e. smp_processor_id() use that the debugging code reports but
196  * which use for some reason is legal). Don't use this to hack around
197  * the warning message, as your code might not work under PREEMPT.
198  */
199 #ifdef CONFIG_DEBUG_PREEMPT
200   extern unsigned int debug_smp_processor_id(void);
201 # define smp_processor_id() debug_smp_processor_id()
202 #else
203 # define smp_processor_id() raw_smp_processor_id()
204 #endif
205 
206 #define get_cpu()               ({ preempt_disable(); smp_processor_id(); })
207 #define put_cpu()               preempt_enable()
208 
209 /*
210  * Callback to arch code if there's nosmp or maxcpus=0 on the
211  * boot command line:
212  */
213 extern void arch_disable_smp_support(void);
214 
215 extern void arch_enable_nonboot_cpus_begin(void);
216 extern void arch_enable_nonboot_cpus_end(void);
217 
218 void smp_setup_processor_id(void);
219 
220 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
221                     bool phys);
222 
223 /* SMP core functions */
224 int smpcfd_prepare_cpu(unsigned int cpu);
225 int smpcfd_dead_cpu(unsigned int cpu);
226 int smpcfd_dying_cpu(unsigned int cpu);
227 
228 #endif /* __LINUX_SMP_H */
229 

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