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
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 int wait);
87
88 /*
89 * Generic and arch helpers
90 */
91 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
92 void generic_smp_call_function_single_interrupt(void);
93 void generic_smp_call_function_interrupt(void);
94 void ipi_call_lock(void);
95 void ipi_call_unlock(void);
96 void ipi_call_lock_irq(void);
97 void ipi_call_unlock_irq(void);
98 #endif
99
100 /*
101 * Call a function on all processors
102 */
103 int on_each_cpu(void (*func) (void *info), void *info, int wait);
104
105 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
106 #define MSG_ALL 0x8001
107
108 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
109 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
110 * when rebooting
111 */
112 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
113 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
114
115 /*
116 * Mark the boot cpu "online" so that it can call console drivers in
117 * printk() and can access its per-cpu storage.
118 */
119 void smp_prepare_boot_cpu(void);
120
121 extern unsigned int setup_max_cpus;
122
123 #else /* !SMP */
124
125 static inline void smp_send_stop(void) { }
126
127 /*
128 * These macros fold the SMP functionality into a single CPU system
129 */
130 #define raw_smp_processor_id() 0
131 static inline int up_smp_call_function(void (*func)(void *), void *info)
132 {
133 return 0;
134 }
135 #define smp_call_function(func, info, wait) \
136 (up_smp_call_function(func, info))
137 #define on_each_cpu(func,info,wait) \
138 ({ \
139 local_irq_disable(); \
140 func(info); \
141 local_irq_enable(); \
142 0; \
143 })
144 static inline void smp_send_reschedule(int cpu) { }
145 #define num_booting_cpus() 1
146 #define smp_prepare_boot_cpu() do {} while (0)
147 #define smp_call_function_mask(mask, func, info, wait) \
148 (up_smp_call_function(func, info))
149 #define smp_call_function_many(mask, func, info, wait) \
150 (up_smp_call_function(func, info))
151 static inline void init_call_single_data(void)
152 {
153 }
154 #endif /* !SMP */
155
156 /*
157 * smp_processor_id(): get the current CPU ID.
158 *
159 * if DEBUG_PREEMPT is enabled the we check whether it is
160 * used in a preemption-safe way. (smp_processor_id() is safe
161 * if it's used in a preemption-off critical section, or in
162 * a thread that is bound to the current CPU.)
163 *
164 * NOTE: raw_smp_processor_id() is for internal use only
165 * (smp_processor_id() is the preferred variant), but in rare
166 * instances it might also be used to turn off false positives
167 * (i.e. smp_processor_id() use that the debugging code reports but
168 * which use for some reason is legal). Don't use this to hack around
169 * the warning message, as your code might not work under PREEMPT.
170 */
171 #ifdef CONFIG_DEBUG_PREEMPT
172 extern unsigned int debug_smp_processor_id(void);
173 # define smp_processor_id() debug_smp_processor_id()
174 #else
175 # define smp_processor_id() raw_smp_processor_id()
176 #endif
177
178 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
179 #define put_cpu() preempt_enable()
180
181 /*
182 * Callback to arch code if there's nosmp or maxcpus=0 on the
183 * boot command line:
184 */
185 extern void arch_disable_smp_support(void);
186
187 void smp_setup_processor_id(void);
188
189 #endif /* __LINUX_SMP_H */
190
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