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
14 extern void cpu_idle(void);
15
16 struct call_single_data {
17 struct list_head list;
18 void (*func) (void *info);
19 void *info;
20 u16 flags;
21 u16 priv;
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, void (*func) (void *info), void *info,
28 int wait);
29
30 #ifdef CONFIG_SMP
31
32 #include <linux/preempt.h>
33 #include <linux/kernel.h>
34 #include <linux/compiler.h>
35 #include <linux/thread_info.h>
36 #include <asm/smp.h>
37
38 /*
39 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
40 * (defined in asm header):
41 */
42
43 /*
44 * stops all CPUs but the current one:
45 */
46 extern void smp_send_stop(void);
47
48 /*
49 * sends a 'reschedule' event to another CPU:
50 */
51 extern void smp_send_reschedule(int cpu);
52
53
54 /*
55 * Prepare machine for booting other CPUs.
56 */
57 extern void smp_prepare_cpus(unsigned int max_cpus);
58
59 /*
60 * Bring a CPU up
61 */
62 extern int __cpu_up(unsigned int cpunum);
63
64 /*
65 * Final polishing of CPUs
66 */
67 extern void smp_cpus_done(unsigned int max_cpus);
68
69 /*
70 * Call a function on all other processors
71 */
72 int smp_call_function(void(*func)(void *info), void *info, int wait);
73 void smp_call_function_many(const struct cpumask *mask,
74 void (*func)(void *info), void *info, bool wait);
75
76 /* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */
77 static inline int
smp_call_function_mask(cpumask_t mask,void (* func)(void * info),void * info,int wait)78 smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
79 int wait)
80 {
81 smp_call_function_many(&mask, func, info, wait);
82 return 0;
83 }
84
85 void __smp_call_function_single(int cpuid, struct call_single_data *data);
86
87 /*
88 * Generic and arch helpers
89 */
90 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
91 void generic_smp_call_function_single_interrupt(void);
92 void generic_smp_call_function_interrupt(void);
93 void ipi_call_lock(void);
94 void ipi_call_unlock(void);
95 void ipi_call_lock_irq(void);
96 void ipi_call_unlock_irq(void);
97 #endif
98
99 /*
100 * Call a function on all processors
101 */
102 int on_each_cpu(void (*func) (void *info), void *info, int wait);
103
104 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
105 #define MSG_ALL 0x8001
106
107 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
108 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
109 * when rebooting
110 */
111 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
112 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
113
114 /*
115 * Mark the boot cpu "online" so that it can call console drivers in
116 * printk() and can access its per-cpu storage.
117 */
118 void smp_prepare_boot_cpu(void);
119
120 extern unsigned int setup_max_cpus;
121
122 #else /* !SMP */
123
124 /*
125 * These macros fold the SMP functionality into a single CPU system
126 */
127 #define raw_smp_processor_id() 0
up_smp_call_function(void (* func)(void *),void * info)128 static inline int up_smp_call_function(void (*func)(void *), void *info)
129 {
130 return 0;
131 }
132 #define smp_call_function(func, info, wait) \
133 (up_smp_call_function(func, info))
134 #define on_each_cpu(func,info,wait) \
135 ({ \
136 local_irq_disable(); \
137 func(info); \
138 local_irq_enable(); \
139 0; \
140 })
smp_send_reschedule(int cpu)141 static inline void smp_send_reschedule(int cpu) { }
142 #define num_booting_cpus() 1
143 #define smp_prepare_boot_cpu() do {} while (0)
144 #define smp_call_function_mask(mask, func, info, wait) \
145 (up_smp_call_function(func, info))
146 #define smp_call_function_many(mask, func, info, wait) \
147 (up_smp_call_function(func, info))
init_call_single_data(void)148 static inline void init_call_single_data(void)
149 {
150 }
151 #endif /* !SMP */
152
153 /*
154 * smp_processor_id(): get the current CPU ID.
155 *
156 * if DEBUG_PREEMPT is enabled the we check whether it is
157 * used in a preemption-safe way. (smp_processor_id() is safe
158 * if it's used in a preemption-off critical section, or in
159 * a thread that is bound to the current CPU.)
160 *
161 * NOTE: raw_smp_processor_id() is for internal use only
162 * (smp_processor_id() is the preferred variant), but in rare
163 * instances it might also be used to turn off false positives
164 * (i.e. smp_processor_id() use that the debugging code reports but
165 * which use for some reason is legal). Don't use this to hack around
166 * the warning message, as your code might not work under PREEMPT.
167 */
168 #ifdef CONFIG_DEBUG_PREEMPT
169 extern unsigned int debug_smp_processor_id(void);
170 # define smp_processor_id() debug_smp_processor_id()
171 #else
172 # define smp_processor_id() raw_smp_processor_id()
173 #endif
174
175 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
176 #define put_cpu() preempt_enable()
177 #define put_cpu_no_resched() preempt_enable_no_resched()
178
179 void smp_setup_processor_id(void);
180
181 #endif /* __LINUX_SMP_H */
182