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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 | ||
3a5f65df | 16 | typedef void (*smp_call_func_t)(void *info); |
3d442233 JA |
17 | struct call_single_data { |
18 | struct list_head list; | |
3a5f65df | 19 | smp_call_func_t func; |
3d442233 | 20 | void *info; |
54514a70 DM |
21 | u16 flags; |
22 | u16 priv; | |
3d442233 JA |
23 | }; |
24 | ||
e057d7ae MT |
25 | /* total number of cpus in this system (may exceed NR_CPUS) */ |
26 | extern unsigned int total_cpus; | |
27 | ||
3a5f65df DH |
28 | int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, |
29 | int wait); | |
53ce3d95 | 30 | |
1da177e4 LT |
31 | #ifdef CONFIG_SMP |
32 | ||
33 | #include <linux/preempt.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/compiler.h> | |
36 | #include <linux/thread_info.h> | |
37 | #include <asm/smp.h> | |
1da177e4 LT |
38 | |
39 | /* | |
40 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. | |
41 | * (defined in asm header): | |
d1dedb52 | 42 | */ |
1da177e4 LT |
43 | |
44 | /* | |
45 | * stops all CPUs but the current one: | |
46 | */ | |
47 | extern void smp_send_stop(void); | |
48 | ||
49 | /* | |
50 | * sends a 'reschedule' event to another CPU: | |
51 | */ | |
52 | extern void smp_send_reschedule(int cpu); | |
53 | ||
54 | ||
55 | /* | |
56 | * Prepare machine for booting other CPUs. | |
57 | */ | |
58 | extern void smp_prepare_cpus(unsigned int max_cpus); | |
59 | ||
60 | /* | |
61 | * Bring a CPU up | |
62 | */ | |
63 | extern int __cpu_up(unsigned int cpunum); | |
64 | ||
65 | /* | |
66 | * Final polishing of CPUs | |
67 | */ | |
68 | extern void smp_cpus_done(unsigned int max_cpus); | |
69 | ||
70 | /* | |
71 | * Call a function on all other processors | |
72 | */ | |
3a5f65df | 73 | int smp_call_function(smp_call_func_t func, void *info, int wait); |
54b11e6d | 74 | void smp_call_function_many(const struct cpumask *mask, |
3a5f65df | 75 | smp_call_func_t func, void *info, bool wait); |
2d3854a3 | 76 | |
6e275637 PZ |
77 | void __smp_call_function_single(int cpuid, struct call_single_data *data, |
78 | int wait); | |
3d442233 | 79 | |
2ea6dec4 | 80 | int smp_call_function_any(const struct cpumask *mask, |
3a5f65df | 81 | smp_call_func_t func, void *info, int wait); |
2ea6dec4 | 82 | |
3d442233 JA |
83 | /* |
84 | * Generic and arch helpers | |
85 | */ | |
86 | #ifdef CONFIG_USE_GENERIC_SMP_HELPERS | |
87 | void generic_smp_call_function_single_interrupt(void); | |
88 | void generic_smp_call_function_interrupt(void); | |
3d442233 JA |
89 | void ipi_call_lock(void); |
90 | void ipi_call_unlock(void); | |
91 | void ipi_call_lock_irq(void); | |
92 | void ipi_call_unlock_irq(void); | |
3d442233 | 93 | #endif |
a3bc0dbc | 94 | |
1da177e4 LT |
95 | /* |
96 | * Call a function on all processors | |
97 | */ | |
3a5f65df | 98 | int on_each_cpu(smp_call_func_t func, void *info, int wait); |
1da177e4 LT |
99 | |
100 | #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ | |
101 | #define MSG_ALL 0x8001 | |
102 | ||
103 | #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ | |
104 | #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's | |
105 | * when rebooting | |
106 | */ | |
107 | #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ | |
108 | #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ | |
109 | ||
110 | /* | |
111 | * Mark the boot cpu "online" so that it can call console drivers in | |
112 | * printk() and can access its per-cpu storage. | |
113 | */ | |
114 | void smp_prepare_boot_cpu(void); | |
115 | ||
ca74a6f8 AK |
116 | extern unsigned int setup_max_cpus; |
117 | ||
1da177e4 LT |
118 | #else /* !SMP */ |
119 | ||
d1dedb52 IM |
120 | static inline void smp_send_stop(void) { } |
121 | ||
1da177e4 LT |
122 | /* |
123 | * These macros fold the SMP functionality into a single CPU system | |
124 | */ | |
39c715b7 | 125 | #define raw_smp_processor_id() 0 |
3a5f65df | 126 | static inline int up_smp_call_function(smp_call_func_t func, void *info) |
3c30b06d CK |
127 | { |
128 | return 0; | |
129 | } | |
8691e5a8 | 130 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 131 | (up_smp_call_function(func, info)) |
15c8b6c1 | 132 | #define on_each_cpu(func,info,wait) \ |
78eef01b AM |
133 | ({ \ |
134 | local_irq_disable(); \ | |
135 | func(info); \ | |
136 | local_irq_enable(); \ | |
137 | 0; \ | |
138 | }) | |
79a88102 | 139 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c LT |
140 | #define num_booting_cpus() 1 |
141 | #define smp_prepare_boot_cpu() do {} while (0) | |
d2ff9118 RR |
142 | #define smp_call_function_many(mask, func, info, wait) \ |
143 | (up_smp_call_function(func, info)) | |
2ea6dec4 RR |
144 | static inline void init_call_single_data(void) { } |
145 | ||
146 | static inline int | |
3a5f65df | 147 | smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, |
2ea6dec4 | 148 | void *info, int wait) |
3d442233 | 149 | { |
2ea6dec4 | 150 | return smp_call_function_single(0, func, info, wait); |
3d442233 | 151 | } |
2ea6dec4 | 152 | |
1da177e4 LT |
153 | #endif /* !SMP */ |
154 | ||
155 | /* | |
39c715b7 | 156 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 157 | * |
cfd8d6c0 | 158 | * if DEBUG_PREEMPT is enabled then we check whether it is |
39c715b7 IM |
159 | * used in a preemption-safe way. (smp_processor_id() is safe |
160 | * if it's used in a preemption-off critical section, or in | |
161 | * a thread that is bound to the current CPU.) | |
1da177e4 | 162 | * |
39c715b7 IM |
163 | * NOTE: raw_smp_processor_id() is for internal use only |
164 | * (smp_processor_id() is the preferred variant), but in rare | |
165 | * instances it might also be used to turn off false positives | |
166 | * (i.e. smp_processor_id() use that the debugging code reports but | |
167 | * which use for some reason is legal). Don't use this to hack around | |
168 | * the warning message, as your code might not work under PREEMPT. | |
1da177e4 | 169 | */ |
39c715b7 IM |
170 | #ifdef CONFIG_DEBUG_PREEMPT |
171 | extern unsigned int debug_smp_processor_id(void); | |
172 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 173 | #else |
39c715b7 | 174 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
175 | #endif |
176 | ||
177 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) | |
178 | #define put_cpu() preempt_enable() | |
1da177e4 | 179 | |
a146649b IM |
180 | /* |
181 | * Callback to arch code if there's nosmp or maxcpus=0 on the | |
182 | * boot command line: | |
183 | */ | |
184 | extern void arch_disable_smp_support(void); | |
185 | ||
033ab7f8 AM |
186 | void smp_setup_processor_id(void); |
187 | ||
1da177e4 | 188 | #endif /* __LINUX_SMP_H */ |