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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 int smp_call_function_single_async(int cpu, call_single_data_t *csd);
 57 
 58 #ifdef CONFIG_SMP
 59 
 60 #include <linux/preempt.h>
 61 #include <linux/kernel.h>
 62 #include <linux/compiler.h>
 63 #include <linux/thread_info.h>
 64 #include <asm/smp.h>
 65 
 66 /*
 67  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
 68  * (defined in asm header):
 69  */
 70 
 71 /*
 72  * stops all CPUs but the current one:
 73  */
 74 extern void smp_send_stop(void);
 75 
 76 /*
 77  * sends a 'reschedule' event to another CPU:
 78  */
 79 extern void smp_send_reschedule(int cpu);
 80 
 81 
 82 /*
 83  * Prepare machine for booting other CPUs.
 84  */
 85 extern void smp_prepare_cpus(unsigned int max_cpus);
 86 
 87 /*
 88  * Bring a CPU up
 89  */
 90 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
 91 
 92 /*
 93  * Final polishing of CPUs
 94  */
 95 extern void smp_cpus_done(unsigned int max_cpus);
 96 
 97 /*
 98  * Call a function on all other processors
 99  */
100 int smp_call_function(smp_call_func_t func, void *info, int wait);
101 void smp_call_function_many(const struct cpumask *mask,
102                             smp_call_func_t func, void *info, bool wait);
103 
104 int smp_call_function_any(const struct cpumask *mask,
105                           smp_call_func_t func, void *info, int wait);
106 
107 void kick_all_cpus_sync(void);
108 void wake_up_all_idle_cpus(void);
109 
110 /*
111  * Generic and arch helpers
112  */
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
117 
118 /*
119  * Mark the boot cpu "online" so that it can call console drivers in
120  * printk() and can access its per-cpu storage.
121  */
122 void smp_prepare_boot_cpu(void);
123 
124 extern unsigned int setup_max_cpus;
125 extern void __init setup_nr_cpu_ids(void);
126 extern void __init smp_init(void);
127 
128 extern int __boot_cpu_id;
129 
130 static inline int get_boot_cpu_id(void)
131 {
132         return __boot_cpu_id;
133 }
134 
135 #else /* !SMP */
136 
137 static inline void smp_send_stop(void) { }
138 
139 /*
140  *      These macros fold the SMP functionality into a single CPU system
141  */
142 #define raw_smp_processor_id()                  0
143 static inline int up_smp_call_function(smp_call_func_t func, void *info)
144 {
145         return 0;
146 }
147 #define smp_call_function(func, info, wait) \
148                         (up_smp_call_function(func, info))
149 
150 static inline void smp_send_reschedule(int cpu) { }
151 #define smp_prepare_boot_cpu()                  do {} while (0)
152 #define smp_call_function_many(mask, func, info, wait) \
153                         (up_smp_call_function(func, info))
154 static inline void call_function_init(void) { }
155 
156 static inline int
157 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
158                       void *info, int wait)
159 {
160         return smp_call_function_single(0, func, info, wait);
161 }
162 
163 static inline void kick_all_cpus_sync(void) {  }
164 static inline void wake_up_all_idle_cpus(void) {  }
165 
166 #ifdef CONFIG_UP_LATE_INIT
167 extern void __init up_late_init(void);
168 static inline void smp_init(void) { up_late_init(); }
169 #else
170 static inline void smp_init(void) { }
171 #endif
172 
173 static inline int get_boot_cpu_id(void)
174 {
175         return 0;
176 }
177 
178 #endif /* !SMP */
179 
180 /*
181  * smp_processor_id(): get the current CPU ID.
182  *
183  * if DEBUG_PREEMPT is enabled then we check whether it is
184  * used in a preemption-safe way. (smp_processor_id() is safe
185  * if it's used in a preemption-off critical section, or in
186  * a thread that is bound to the current CPU.)
187  *
188  * NOTE: raw_smp_processor_id() is for internal use only
189  * (smp_processor_id() is the preferred variant), but in rare
190  * instances it might also be used to turn off false positives
191  * (i.e. smp_processor_id() use that the debugging code reports but
192  * which use for some reason is legal). Don't use this to hack around
193  * the warning message, as your code might not work under PREEMPT.
194  */
195 #ifdef CONFIG_DEBUG_PREEMPT
196   extern unsigned int debug_smp_processor_id(void);
197 # define smp_processor_id() debug_smp_processor_id()
198 #else
199 # define smp_processor_id() raw_smp_processor_id()
200 #endif
201 
202 #define get_cpu()               ({ preempt_disable(); smp_processor_id(); })
203 #define put_cpu()               preempt_enable()
204 
205 /*
206  * Callback to arch code if there's nosmp or maxcpus=0 on the
207  * boot command line:
208  */
209 extern void arch_disable_smp_support(void);
210 
211 extern void arch_enable_nonboot_cpus_begin(void);
212 extern void arch_enable_nonboot_cpus_end(void);
213 
214 void smp_setup_processor_id(void);
215 
216 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
217                     bool phys);
218 
219 /* SMP core functions */
220 int smpcfd_prepare_cpu(unsigned int cpu);
221 int smpcfd_dead_cpu(unsigned int cpu);
222 int smpcfd_dying_cpu(unsigned int cpu);
223 
224 #endif /* __LINUX_SMP_H */
225 

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