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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/smp_types.h>
 16 
 17 typedef void (*smp_call_func_t)(void *info);
 18 typedef bool (*smp_cond_func_t)(int cpu, void *info);
 19 
 20 /*
 21  * structure shares (partial) layout with struct irq_work
 22  */
 23 struct __call_single_data {
 24         struct __call_single_node node;
 25         smp_call_func_t func;
 26         void *info;
 27 };
 28 
 29 #define CSD_INIT(_func, _info) \
 30         (struct __call_single_data){ .func = (_func), .info = (_info), }
 31 
 32 /* Use __aligned() to avoid to use 2 cache lines for 1 csd */
 33 typedef struct __call_single_data call_single_data_t
 34         __aligned(sizeof(struct __call_single_data));
 35 
 36 #define INIT_CSD(_csd, _func, _info)            \
 37 do {                                            \
 38         *(_csd) = CSD_INIT((_func), (_info));   \
 39 } while (0)
 40 
 41 /*
 42  * Enqueue a llist_node on the call_single_queue; be very careful, read
 43  * flush_smp_call_function_queue() in detail.
 44  */
 45 extern void __smp_call_single_queue(int cpu, struct llist_node *node);
 46 
 47 /* total number of cpus in this system (may exceed NR_CPUS) */
 48 extern unsigned int total_cpus;
 49 
 50 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
 51                              int wait);
 52 
 53 void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
 54                            void *info, bool wait, const struct cpumask *mask);
 55 
 56 int smp_call_function_single_async(int cpu, struct __call_single_data *csd);
 57 
 58 /*
 59  * Cpus stopping functions in panic. All have default weak definitions.
 60  * Architecture-dependent code may override them.
 61  */
 62 void panic_smp_self_stop(void);
 63 void nmi_panic_self_stop(struct pt_regs *regs);
 64 void crash_smp_send_stop(void);
 65 
 66 /*
 67  * Call a function on all processors
 68  */
 69 static inline void on_each_cpu(smp_call_func_t func, void *info, int wait)
 70 {
 71         on_each_cpu_cond_mask(NULL, func, info, wait, cpu_online_mask);
 72 }
 73 
 74 /**
 75  * on_each_cpu_mask(): Run a function on processors specified by
 76  * cpumask, which may include the local processor.
 77  * @mask: The set of cpus to run on (only runs on online subset).
 78  * @func: The function to run. This must be fast and non-blocking.
 79  * @info: An arbitrary pointer to pass to the function.
 80  * @wait: If true, wait (atomically) until function has completed
 81  *        on other CPUs.
 82  *
 83  * If @wait is true, then returns once @func has returned.
 84  *
 85  * You must not call this function with disabled interrupts or from a
 86  * hardware interrupt handler or from a bottom half handler.  The
 87  * exception is that it may be used during early boot while
 88  * early_boot_irqs_disabled is set.
 89  */
 90 static inline void on_each_cpu_mask(const struct cpumask *mask,
 91                                     smp_call_func_t func, void *info, bool wait)
 92 {
 93         on_each_cpu_cond_mask(NULL, func, info, wait, mask);
 94 }
 95 
 96 /*
 97  * Call a function on each processor for which the supplied function
 98  * cond_func returns a positive value. This may include the local
 99  * processor.  May be used during early boot while early_boot_irqs_disabled is
100  * set. Use local_irq_save/restore() instead of local_irq_disable/enable().
101  */
102 static inline void on_each_cpu_cond(smp_cond_func_t cond_func,
103                                     smp_call_func_t func, void *info, bool wait)
104 {
105         on_each_cpu_cond_mask(cond_func, func, info, wait, cpu_online_mask);
106 }
107 
108 #ifdef CONFIG_SMP
109 
110 #include <linux/preempt.h>
111 #include <linux/kernel.h>
112 #include <linux/compiler.h>
113 #include <linux/thread_info.h>
114 #include <asm/smp.h>
115 
116 /*
117  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
118  * (defined in asm header):
119  */
120 
121 /*
122  * stops all CPUs but the current one:
123  */
124 extern void smp_send_stop(void);
125 
126 /*
127  * sends a 'reschedule' event to another CPU:
128  */
129 extern void smp_send_reschedule(int cpu);
130 
131 
132 /*
133  * Prepare machine for booting other CPUs.
134  */
135 extern void smp_prepare_cpus(unsigned int max_cpus);
136 
137 /*
138  * Bring a CPU up
139  */
140 extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
141 
142 /*
143  * Final polishing of CPUs
144  */
145 extern void smp_cpus_done(unsigned int max_cpus);
146 
147 /*
148  * Call a function on all other processors
149  */
150 void smp_call_function(smp_call_func_t func, void *info, int wait);
151 void smp_call_function_many(const struct cpumask *mask,
152                             smp_call_func_t func, void *info, bool wait);
153 
154 int smp_call_function_any(const struct cpumask *mask,
155                           smp_call_func_t func, void *info, int wait);
156 
157 void kick_all_cpus_sync(void);
158 void wake_up_all_idle_cpus(void);
159 
160 /*
161  * Generic and arch helpers
162  */
163 void __init call_function_init(void);
164 void generic_smp_call_function_single_interrupt(void);
165 #define generic_smp_call_function_interrupt \
166         generic_smp_call_function_single_interrupt
167 
168 /*
169  * Mark the boot cpu "online" so that it can call console drivers in
170  * printk() and can access its per-cpu storage.
171  */
172 void smp_prepare_boot_cpu(void);
173 
174 extern unsigned int setup_max_cpus;
175 extern void __init setup_nr_cpu_ids(void);
176 extern void __init smp_init(void);
177 
178 extern int __boot_cpu_id;
179 
180 static inline int get_boot_cpu_id(void)
181 {
182         return __boot_cpu_id;
183 }
184 
185 #else /* !SMP */
186 
187 static inline void smp_send_stop(void) { }
188 
189 /*
190  *      These macros fold the SMP functionality into a single CPU system
191  */
192 #define raw_smp_processor_id()                  0
193 static inline void up_smp_call_function(smp_call_func_t func, void *info)
194 {
195 }
196 #define smp_call_function(func, info, wait) \
197                         (up_smp_call_function(func, info))
198 
199 static inline void smp_send_reschedule(int cpu) { }
200 #define smp_prepare_boot_cpu()                  do {} while (0)
201 #define smp_call_function_many(mask, func, info, wait) \
202                         (up_smp_call_function(func, info))
203 static inline void call_function_init(void) { }
204 
205 static inline int
206 smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
207                       void *info, int wait)
208 {
209         return smp_call_function_single(0, func, info, wait);
210 }
211 
212 static inline void kick_all_cpus_sync(void) {  }
213 static inline void wake_up_all_idle_cpus(void) {  }
214 
215 #ifdef CONFIG_UP_LATE_INIT
216 extern void __init up_late_init(void);
217 static inline void smp_init(void) { up_late_init(); }
218 #else
219 static inline void smp_init(void) { }
220 #endif
221 
222 static inline int get_boot_cpu_id(void)
223 {
224         return 0;
225 }
226 
227 #endif /* !SMP */
228 
229 /**
230  * raw_processor_id() - get the current (unstable) CPU id
231  *
232  * For then you know what you are doing and need an unstable
233  * CPU id.
234  */
235 
236 /**
237  * smp_processor_id() - get the current (stable) CPU id
238  *
239  * This is the normal accessor to the CPU id and should be used
240  * whenever possible.
241  *
242  * The CPU id is stable when:
243  *
244  *  - IRQs are disabled;
245  *  - preemption is disabled;
246  *  - the task is CPU affine.
247  *
248  * When CONFIG_DEBUG_PREEMPT; we verify these assumption and WARN
249  * when smp_processor_id() is used when the CPU id is not stable.
250  */
251 
252 /*
253  * Allow the architecture to differentiate between a stable and unstable read.
254  * For example, x86 uses an IRQ-safe asm-volatile read for the unstable but a
255  * regular asm read for the stable.
256  */
257 #ifndef __smp_processor_id
258 #define __smp_processor_id(x) raw_smp_processor_id(x)
259 #endif
260 
261 #ifdef CONFIG_DEBUG_PREEMPT
262   extern unsigned int debug_smp_processor_id(void);
263 # define smp_processor_id() debug_smp_processor_id()
264 #else
265 # define smp_processor_id() __smp_processor_id()
266 #endif
267 
268 #define get_cpu()               ({ preempt_disable(); __smp_processor_id(); })
269 #define put_cpu()               preempt_enable()
270 
271 /*
272  * Callback to arch code if there's nosmp or maxcpus=0 on the
273  * boot command line:
274  */
275 extern void arch_disable_smp_support(void);
276 
277 extern void arch_thaw_secondary_cpus_begin(void);
278 extern void arch_thaw_secondary_cpus_end(void);
279 
280 void smp_setup_processor_id(void);
281 
282 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
283                     bool phys);
284 
285 /* SMP core functions */
286 int smpcfd_prepare_cpu(unsigned int cpu);
287 int smpcfd_dead_cpu(unsigned int cpu);
288 int smpcfd_dying_cpu(unsigned int cpu);
289 
290 #endif /* __LINUX_SMP_H */
291 

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