diff options
Diffstat (limited to 'kernel/include/linux/smp.h')
| -rw-r--r-- | kernel/include/linux/smp.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/kernel/include/linux/smp.h b/kernel/include/linux/smp.h new file mode 100644 index 000000000..e6ab36aea --- /dev/null +++ b/kernel/include/linux/smp.h @@ -0,0 +1,202 @@ +#ifndef __LINUX_SMP_H +#define __LINUX_SMP_H + +/* + * Generic SMP support + * Alan Cox. <alan@redhat.com> + */ + +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/list.h> +#include <linux/cpumask.h> +#include <linux/init.h> +#include <linux/llist.h> + +typedef void (*smp_call_func_t)(void *info); +struct call_single_data { + struct llist_node llist; + smp_call_func_t func; + void *info; + unsigned int flags; +}; + +/* total number of cpus in this system (may exceed NR_CPUS) */ +extern unsigned int total_cpus; + +int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, + int wait); + +/* + * Call a function on all processors + */ +int on_each_cpu(smp_call_func_t func, void *info, int wait); + +/* + * Call a function on processors specified by mask, which might include + * the local one. + */ +void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, + void *info, bool wait); + +/* + * Call a function on each processor for which the supplied function + * cond_func returns a positive value. This may include the local + * processor. + */ +void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), + smp_call_func_t func, void *info, bool wait, + gfp_t gfp_flags); + +int smp_call_function_single_async(int cpu, struct call_single_data *csd); + +#ifdef CONFIG_SMP + +#include <linux/preempt.h> +#include <linux/kernel.h> +#include <linux/compiler.h> +#include <linux/thread_info.h> +#include <asm/smp.h> + +/* + * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. + * (defined in asm header): + */ + +/* + * stops all CPUs but the current one: + */ +extern void smp_send_stop(void); + +/* + * sends a 'reschedule' event to another CPU: + */ +extern void smp_send_reschedule(int cpu); + + +/* + * Prepare machine for booting other CPUs. + */ +extern void smp_prepare_cpus(unsigned int max_cpus); + +/* + * Bring a CPU up + */ +extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); + +/* + * Final polishing of CPUs + */ +extern void smp_cpus_done(unsigned int max_cpus); + +/* + * Call a function on all other processors + */ +int smp_call_function(smp_call_func_t func, void *info, int wait); +void smp_call_function_many(const struct cpumask *mask, + smp_call_func_t func, void *info, bool wait); + +int smp_call_function_any(const struct cpumask *mask, + smp_call_func_t func, void *info, int wait); + +void kick_all_cpus_sync(void); +void wake_up_all_idle_cpus(void); + +/* + * Generic and arch helpers + */ +void __init call_function_init(void); +void generic_smp_call_function_single_interrupt(void); +#define generic_smp_call_function_interrupt \ + generic_smp_call_function_single_interrupt + +/* + * Mark the boot cpu "online" so that it can call console drivers in + * printk() and can access its per-cpu storage. + */ +void smp_prepare_boot_cpu(void); + +extern unsigned int setup_max_cpus; +extern void __init setup_nr_cpu_ids(void); +extern void __init smp_init(void); + +#else /* !SMP */ + +static inline void smp_send_stop(void) { } + +/* + * These macros fold the SMP functionality into a single CPU system + */ +#define raw_smp_processor_id() 0 +static inline int up_smp_call_function(smp_call_func_t func, void *info) +{ + return 0; +} +#define smp_call_function(func, info, wait) \ + (up_smp_call_function(func, info)) + +static inline void smp_send_reschedule(int cpu) { } +#define smp_prepare_boot_cpu() do {} while (0) +#define smp_call_function_many(mask, func, info, wait) \ + (up_smp_call_function(func, info)) +static inline void call_function_init(void) { } + +static inline int +smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, + void *info, int wait) +{ + return smp_call_function_single(0, func, info, wait); +} + +static inline void kick_all_cpus_sync(void) { } +static inline void wake_up_all_idle_cpus(void) { } + +#ifdef CONFIG_UP_LATE_INIT +extern void __init up_late_init(void); +static inline void smp_init(void) { up_late_init(); } +#else +static inline void smp_init(void) { } +#endif + +#endif /* !SMP */ + +/* + * smp_processor_id(): get the current CPU ID. + * + * if DEBUG_PREEMPT is enabled then we check whether it is + * used in a preemption-safe way. (smp_processor_id() is safe + * if it's used in a preemption-off critical section, or in + * a thread that is bound to the current CPU.) + * + * NOTE: raw_smp_processor_id() is for internal use only + * (smp_processor_id() is the preferred variant), but in rare + * instances it might also be used to turn off false positives + * (i.e. smp_processor_id() use that the debugging code reports but + * which use for some reason is legal). Don't use this to hack around + * the warning message, as your code might not work under PREEMPT. + */ +#ifdef CONFIG_DEBUG_PREEMPT + extern unsigned int debug_smp_processor_id(void); +# define smp_processor_id() debug_smp_processor_id() +#else +# define smp_processor_id() raw_smp_processor_id() +#endif + +#define get_cpu() ({ preempt_disable(); smp_processor_id(); }) +#define put_cpu() preempt_enable() + +#define get_cpu_light() ({ migrate_disable(); smp_processor_id(); }) +#define put_cpu_light() migrate_enable() + +/* + * Callback to arch code if there's nosmp or maxcpus=0 on the + * boot command line: + */ +extern void arch_disable_smp_support(void); + +extern void arch_enable_nonboot_cpus_begin(void); +extern void arch_enable_nonboot_cpus_end(void); + +void smp_setup_processor_id(void); + +#endif /* __LINUX_SMP_H */ |