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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> |
54514a70 | 10 | #include <linux/types.h> |
3d442233 | 11 | #include <linux/list.h> |
3d442233 | 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; | |
54514a70 DM |
20 | u16 flags; |
21 | u16 priv; | |
3d442233 JA |
22 | }; |
23 | ||
e057d7ae MT |
24 | /* total number of cpus in this system (may exceed NR_CPUS) */ |
25 | extern unsigned int total_cpus; | |
26 | ||
53ce3d95 AM |
27 | int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, |
28 | int wait); | |
29 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
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 | ||
65a4e574 IM |
69 | /* |
70 | * Callback to arch code if there's nosmp or maxcpus=0 on the | |
71 | * boot command line: | |
72 | */ | |
73 | extern void arch_disable_smp_support(void); | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * Call a function on all other processors | |
77 | */ | |
8691e5a8 | 78 | int smp_call_function(void(*func)(void *info), void *info, int wait); |
54b11e6d RR |
79 | void smp_call_function_many(const struct cpumask *mask, |
80 | void (*func)(void *info), void *info, bool wait); | |
2d3854a3 | 81 | |
54b11e6d RR |
82 | /* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */ |
83 | static inline int | |
84 | smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info, | |
85 | int wait) | |
2d3854a3 | 86 | { |
54b11e6d RR |
87 | smp_call_function_many(&mask, func, info, wait); |
88 | return 0; | |
2d3854a3 RR |
89 | } |
90 | ||
3d442233 JA |
91 | void __smp_call_function_single(int cpuid, struct call_single_data *data); |
92 | ||
93 | /* | |
94 | * Generic and arch helpers | |
95 | */ | |
96 | #ifdef CONFIG_USE_GENERIC_SMP_HELPERS | |
97 | void generic_smp_call_function_single_interrupt(void); | |
98 | void generic_smp_call_function_interrupt(void); | |
3d442233 JA |
99 | void ipi_call_lock(void); |
100 | void ipi_call_unlock(void); | |
101 | void ipi_call_lock_irq(void); | |
102 | void ipi_call_unlock_irq(void); | |
3d442233 | 103 | #endif |
a3bc0dbc | 104 | |
1da177e4 LT |
105 | /* |
106 | * Call a function on all processors | |
107 | */ | |
15c8b6c1 | 108 | int on_each_cpu(void (*func) (void *info), void *info, int wait); |
1da177e4 LT |
109 | |
110 | #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ | |
111 | #define MSG_ALL 0x8001 | |
112 | ||
113 | #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ | |
114 | #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's | |
115 | * when rebooting | |
116 | */ | |
117 | #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ | |
118 | #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ | |
119 | ||
120 | /* | |
121 | * Mark the boot cpu "online" so that it can call console drivers in | |
122 | * printk() and can access its per-cpu storage. | |
123 | */ | |
124 | void smp_prepare_boot_cpu(void); | |
125 | ||
ca74a6f8 AK |
126 | extern unsigned int setup_max_cpus; |
127 | ||
1da177e4 LT |
128 | #else /* !SMP */ |
129 | ||
130 | /* | |
131 | * These macros fold the SMP functionality into a single CPU system | |
132 | */ | |
39c715b7 | 133 | #define raw_smp_processor_id() 0 |
a5fbb6d1 | 134 | static inline int up_smp_call_function(void (*func)(void *), void *info) |
3c30b06d CK |
135 | { |
136 | return 0; | |
137 | } | |
8691e5a8 | 138 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 139 | (up_smp_call_function(func, info)) |
15c8b6c1 | 140 | #define on_each_cpu(func,info,wait) \ |
78eef01b AM |
141 | ({ \ |
142 | local_irq_disable(); \ | |
143 | func(info); \ | |
144 | local_irq_enable(); \ | |
145 | 0; \ | |
146 | }) | |
79a88102 | 147 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c LT |
148 | #define num_booting_cpus() 1 |
149 | #define smp_prepare_boot_cpu() do {} while (0) | |
a5fbb6d1 IM |
150 | #define smp_call_function_mask(mask, func, info, wait) \ |
151 | (up_smp_call_function(func, info)) | |
d2ff9118 RR |
152 | #define smp_call_function_many(mask, func, info, wait) \ |
153 | (up_smp_call_function(func, info)) | |
3d442233 JA |
154 | static inline void init_call_single_data(void) |
155 | { | |
156 | } | |
1da177e4 LT |
157 | #endif /* !SMP */ |
158 | ||
159 | /* | |
39c715b7 | 160 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 161 | * |
39c715b7 IM |
162 | * if DEBUG_PREEMPT is enabled the we check whether it is |
163 | * used in a preemption-safe way. (smp_processor_id() is safe | |
164 | * if it's used in a preemption-off critical section, or in | |
165 | * a thread that is bound to the current CPU.) | |
1da177e4 | 166 | * |
39c715b7 IM |
167 | * NOTE: raw_smp_processor_id() is for internal use only |
168 | * (smp_processor_id() is the preferred variant), but in rare | |
169 | * instances it might also be used to turn off false positives | |
170 | * (i.e. smp_processor_id() use that the debugging code reports but | |
171 | * which use for some reason is legal). Don't use this to hack around | |
172 | * the warning message, as your code might not work under PREEMPT. | |
1da177e4 | 173 | */ |
39c715b7 IM |
174 | #ifdef CONFIG_DEBUG_PREEMPT |
175 | extern unsigned int debug_smp_processor_id(void); | |
176 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 177 | #else |
39c715b7 | 178 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
179 | #endif |
180 | ||
181 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) | |
182 | #define put_cpu() preempt_enable() | |
183 | #define put_cpu_no_resched() preempt_enable_no_resched() | |
184 | ||
033ab7f8 AM |
185 | void smp_setup_processor_id(void); |
186 | ||
1da177e4 | 187 | #endif /* __LINUX_SMP_H */ |