| 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 | #include <linux/init.h> |
| 14 | #include <linux/llist.h> |
| 15 | |
| 16 | typedef void (*smp_call_func_t)(void *info); |
| 17 | struct call_single_data { |
| 18 | struct llist_node llist; |
| 19 | smp_call_func_t func; |
| 20 | void *info; |
| 21 | unsigned int flags; |
| 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, smp_call_func_t func, void *info, |
| 28 | int wait); |
| 29 | |
| 30 | /* |
| 31 | * Call a function on all processors |
| 32 | */ |
| 33 | int on_each_cpu(smp_call_func_t func, void *info, int wait); |
| 34 | |
| 35 | /* |
| 36 | * Call a function on processors specified by mask, which might include |
| 37 | * the local one. |
| 38 | */ |
| 39 | void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, |
| 40 | void *info, bool wait); |
| 41 | |
| 42 | /* |
| 43 | * Call a function on each processor for which the supplied function |
| 44 | * cond_func returns a positive value. This may include the local |
| 45 | * processor. |
| 46 | */ |
| 47 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), |
| 48 | smp_call_func_t func, void *info, bool wait, |
| 49 | gfp_t gfp_flags); |
| 50 | |
| 51 | int smp_call_function_single_async(int cpu, struct call_single_data *csd); |
| 52 | |
| 53 | #ifdef CONFIG_SMP |
| 54 | |
| 55 | #include <linux/preempt.h> |
| 56 | #include <linux/kernel.h> |
| 57 | #include <linux/compiler.h> |
| 58 | #include <linux/thread_info.h> |
| 59 | #include <asm/smp.h> |
| 60 | |
| 61 | /* |
| 62 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. |
| 63 | * (defined in asm header): |
| 64 | */ |
| 65 | |
| 66 | /* |
| 67 | * stops all CPUs but the current one: |
| 68 | */ |
| 69 | extern void smp_send_stop(void); |
| 70 | |
| 71 | /* |
| 72 | * sends a 'reschedule' event to another CPU: |
| 73 | */ |
| 74 | extern void smp_send_reschedule(int cpu); |
| 75 | |
| 76 | |
| 77 | /* |
| 78 | * Prepare machine for booting other CPUs. |
| 79 | */ |
| 80 | extern void smp_prepare_cpus(unsigned int max_cpus); |
| 81 | |
| 82 | /* |
| 83 | * Bring a CPU up |
| 84 | */ |
| 85 | extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); |
| 86 | |
| 87 | /* |
| 88 | * Final polishing of CPUs |
| 89 | */ |
| 90 | extern void smp_cpus_done(unsigned int max_cpus); |
| 91 | |
| 92 | /* |
| 93 | * Call a function on all other processors |
| 94 | */ |
| 95 | int smp_call_function(smp_call_func_t func, void *info, int wait); |
| 96 | void smp_call_function_many(const struct cpumask *mask, |
| 97 | smp_call_func_t func, void *info, bool wait); |
| 98 | |
| 99 | int smp_call_function_any(const struct cpumask *mask, |
| 100 | smp_call_func_t func, void *info, int wait); |
| 101 | |
| 102 | void kick_all_cpus_sync(void); |
| 103 | void wake_up_all_idle_cpus(void); |
| 104 | |
| 105 | /* |
| 106 | * Generic and arch helpers |
| 107 | */ |
| 108 | void __init call_function_init(void); |
| 109 | void generic_smp_call_function_single_interrupt(void); |
| 110 | #define generic_smp_call_function_interrupt \ |
| 111 | generic_smp_call_function_single_interrupt |
| 112 | |
| 113 | /* |
| 114 | * Mark the boot cpu "online" so that it can call console drivers in |
| 115 | * printk() and can access its per-cpu storage. |
| 116 | */ |
| 117 | void smp_prepare_boot_cpu(void); |
| 118 | |
| 119 | extern unsigned int setup_max_cpus; |
| 120 | extern void __init setup_nr_cpu_ids(void); |
| 121 | extern void __init smp_init(void); |
| 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(smp_call_func_t func, void *info) |
| 132 | { |
| 133 | return 0; |
| 134 | } |
| 135 | #define smp_call_function(func, info, wait) \ |
| 136 | (up_smp_call_function(func, info)) |
| 137 | |
| 138 | static inline void smp_send_reschedule(int cpu) { } |
| 139 | #define smp_prepare_boot_cpu() do {} while (0) |
| 140 | #define smp_call_function_many(mask, func, info, wait) \ |
| 141 | (up_smp_call_function(func, info)) |
| 142 | static inline void call_function_init(void) { } |
| 143 | |
| 144 | static inline int |
| 145 | smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, |
| 146 | void *info, int wait) |
| 147 | { |
| 148 | return smp_call_function_single(0, func, info, wait); |
| 149 | } |
| 150 | |
| 151 | static inline void kick_all_cpus_sync(void) { } |
| 152 | static inline void wake_up_all_idle_cpus(void) { } |
| 153 | |
| 154 | #ifdef CONFIG_UP_LATE_INIT |
| 155 | extern void __init up_late_init(void); |
| 156 | static inline void smp_init(void) { up_late_init(); } |
| 157 | #else |
| 158 | static inline void smp_init(void) { } |
| 159 | #endif |
| 160 | |
| 161 | #endif /* !SMP */ |
| 162 | |
| 163 | /* |
| 164 | * smp_processor_id(): get the current CPU ID. |
| 165 | * |
| 166 | * if DEBUG_PREEMPT is enabled then we check whether it is |
| 167 | * used in a preemption-safe way. (smp_processor_id() is safe |
| 168 | * if it's used in a preemption-off critical section, or in |
| 169 | * a thread that is bound to the current CPU.) |
| 170 | * |
| 171 | * NOTE: raw_smp_processor_id() is for internal use only |
| 172 | * (smp_processor_id() is the preferred variant), but in rare |
| 173 | * instances it might also be used to turn off false positives |
| 174 | * (i.e. smp_processor_id() use that the debugging code reports but |
| 175 | * which use for some reason is legal). Don't use this to hack around |
| 176 | * the warning message, as your code might not work under PREEMPT. |
| 177 | */ |
| 178 | #ifdef CONFIG_DEBUG_PREEMPT |
| 179 | extern unsigned int debug_smp_processor_id(void); |
| 180 | # define smp_processor_id() debug_smp_processor_id() |
| 181 | #else |
| 182 | # define smp_processor_id() raw_smp_processor_id() |
| 183 | #endif |
| 184 | |
| 185 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) |
| 186 | #define put_cpu() preempt_enable() |
| 187 | |
| 188 | /* |
| 189 | * Callback to arch code if there's nosmp or maxcpus=0 on the |
| 190 | * boot command line: |
| 191 | */ |
| 192 | extern void arch_disable_smp_support(void); |
| 193 | |
| 194 | extern void arch_enable_nonboot_cpus_begin(void); |
| 195 | extern void arch_enable_nonboot_cpus_end(void); |
| 196 | |
| 197 | void smp_setup_processor_id(void); |
| 198 | |
| 199 | #endif /* __LINUX_SMP_H */ |