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1da177e4 LT |
1 | #ifndef __LINUX_SMP_H |
2 | #define __LINUX_SMP_H | |
3 | ||
4 | /* | |
5 | * Generic SMP support | |
6 | * Alan Cox. <alan@redhat.com> | |
7 | */ | |
8 | ||
79974a0e | 9 | #include <linux/errno.h> |
3d442233 JA |
10 | #include <linux/list.h> |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/cpumask.h> | |
1da177e4 LT |
13 | |
14 | extern void cpu_idle(void); | |
15 | ||
3d442233 JA |
16 | struct call_single_data { |
17 | struct list_head list; | |
18 | void (*func) (void *info); | |
19 | void *info; | |
20 | unsigned int flags; | |
21 | }; | |
22 | ||
1da177e4 LT |
23 | #ifdef CONFIG_SMP |
24 | ||
25 | #include <linux/preempt.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/compiler.h> | |
28 | #include <linux/thread_info.h> | |
29 | #include <asm/smp.h> | |
1da177e4 LT |
30 | |
31 | /* | |
32 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. | |
33 | * (defined in asm header): | |
34 | */ | |
35 | ||
36 | /* | |
37 | * stops all CPUs but the current one: | |
38 | */ | |
39 | extern void smp_send_stop(void); | |
40 | ||
41 | /* | |
42 | * sends a 'reschedule' event to another CPU: | |
43 | */ | |
44 | extern void smp_send_reschedule(int cpu); | |
45 | ||
46 | ||
47 | /* | |
48 | * Prepare machine for booting other CPUs. | |
49 | */ | |
50 | extern void smp_prepare_cpus(unsigned int max_cpus); | |
51 | ||
52 | /* | |
53 | * Bring a CPU up | |
54 | */ | |
55 | extern int __cpu_up(unsigned int cpunum); | |
56 | ||
57 | /* | |
58 | * Final polishing of CPUs | |
59 | */ | |
60 | extern void smp_cpus_done(unsigned int max_cpus); | |
61 | ||
62 | /* | |
63 | * Call a function on all other processors | |
64 | */ | |
8691e5a8 | 65 | int smp_call_function(void(*func)(void *info), void *info, int wait); |
3d442233 JA |
66 | int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info, |
67 | int wait); | |
a3bc0dbc | 68 | int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, |
8691e5a8 | 69 | int wait); |
3d442233 JA |
70 | void __smp_call_function_single(int cpuid, struct call_single_data *data); |
71 | ||
72 | /* | |
73 | * Generic and arch helpers | |
74 | */ | |
75 | #ifdef CONFIG_USE_GENERIC_SMP_HELPERS | |
76 | void generic_smp_call_function_single_interrupt(void); | |
77 | void generic_smp_call_function_interrupt(void); | |
78 | void init_call_single_data(void); | |
79 | void ipi_call_lock(void); | |
80 | void ipi_call_unlock(void); | |
81 | void ipi_call_lock_irq(void); | |
82 | void ipi_call_unlock_irq(void); | |
83 | #else | |
84 | static inline void init_call_single_data(void) | |
85 | { | |
86 | } | |
87 | #endif | |
a3bc0dbc | 88 | |
1da177e4 LT |
89 | /* |
90 | * Call a function on all processors | |
91 | */ | |
78eef01b | 92 | int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait); |
1da177e4 LT |
93 | |
94 | #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ | |
95 | #define MSG_ALL 0x8001 | |
96 | ||
97 | #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ | |
98 | #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's | |
99 | * when rebooting | |
100 | */ | |
101 | #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ | |
102 | #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ | |
103 | ||
104 | /* | |
105 | * Mark the boot cpu "online" so that it can call console drivers in | |
106 | * printk() and can access its per-cpu storage. | |
107 | */ | |
108 | void smp_prepare_boot_cpu(void); | |
109 | ||
ca74a6f8 AK |
110 | extern unsigned int setup_max_cpus; |
111 | ||
1da177e4 LT |
112 | #else /* !SMP */ |
113 | ||
114 | /* | |
115 | * These macros fold the SMP functionality into a single CPU system | |
116 | */ | |
39c715b7 | 117 | #define raw_smp_processor_id() 0 |
a5fbb6d1 | 118 | static inline int up_smp_call_function(void (*func)(void *), void *info) |
3c30b06d CK |
119 | { |
120 | return 0; | |
121 | } | |
8691e5a8 | 122 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 123 | (up_smp_call_function(func, info)) |
78eef01b AM |
124 | #define on_each_cpu(func,info,retry,wait) \ |
125 | ({ \ | |
126 | local_irq_disable(); \ | |
127 | func(info); \ | |
128 | local_irq_enable(); \ | |
129 | 0; \ | |
130 | }) | |
79a88102 | 131 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c LT |
132 | #define num_booting_cpus() 1 |
133 | #define smp_prepare_boot_cpu() do {} while (0) | |
8691e5a8 | 134 | #define smp_call_function_single(cpuid, func, info, wait) \ |
8dfd588c AV |
135 | ({ \ |
136 | WARN_ON(cpuid != 0); \ | |
137 | local_irq_disable(); \ | |
138 | (func)(info); \ | |
139 | local_irq_enable(); \ | |
140 | 0; \ | |
141 | }) | |
a5fbb6d1 IM |
142 | #define smp_call_function_mask(mask, func, info, wait) \ |
143 | (up_smp_call_function(func, info)) | |
3d442233 JA |
144 | static inline void init_call_single_data(void) |
145 | { | |
146 | } | |
1da177e4 LT |
147 | #endif /* !SMP */ |
148 | ||
149 | /* | |
39c715b7 | 150 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 151 | * |
39c715b7 IM |
152 | * if DEBUG_PREEMPT is enabled the we check whether it is |
153 | * used in a preemption-safe way. (smp_processor_id() is safe | |
154 | * if it's used in a preemption-off critical section, or in | |
155 | * a thread that is bound to the current CPU.) | |
1da177e4 | 156 | * |
39c715b7 IM |
157 | * NOTE: raw_smp_processor_id() is for internal use only |
158 | * (smp_processor_id() is the preferred variant), but in rare | |
159 | * instances it might also be used to turn off false positives | |
160 | * (i.e. smp_processor_id() use that the debugging code reports but | |
161 | * which use for some reason is legal). Don't use this to hack around | |
162 | * the warning message, as your code might not work under PREEMPT. | |
1da177e4 | 163 | */ |
39c715b7 IM |
164 | #ifdef CONFIG_DEBUG_PREEMPT |
165 | extern unsigned int debug_smp_processor_id(void); | |
166 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 167 | #else |
39c715b7 | 168 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
169 | #endif |
170 | ||
171 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) | |
172 | #define put_cpu() preempt_enable() | |
173 | #define put_cpu_no_resched() preempt_enable_no_resched() | |
174 | ||
033ab7f8 AM |
175 | void smp_setup_processor_id(void); |
176 | ||
1da177e4 | 177 | #endif /* __LINUX_SMP_H */ |