diff options
Diffstat (limited to 'include/linux/smp.h')
| -rw-r--r-- | include/linux/smp.h | 110 |
1 files changed, 76 insertions, 34 deletions
diff --git a/include/linux/smp.h b/include/linux/smp.h index 9f13966d3d92..f1aa0952e8c3 100644 --- a/include/linux/smp.h +++ b/include/linux/smp.h @@ -21,24 +21,23 @@ typedef bool (*smp_cond_func_t)(int cpu, void *info); * structure shares (partial) layout with struct irq_work */ struct __call_single_data { - union { - struct __call_single_node node; - struct { - struct llist_node llist; - unsigned int flags; -#ifdef CONFIG_64BIT - u16 src, dst; -#endif - }; - }; + struct __call_single_node node; smp_call_func_t func; void *info; }; +#define CSD_INIT(_func, _info) \ + (struct __call_single_data){ .func = (_func), .info = (_info), } + /* Use __aligned() to avoid to use 2 cache lines for 1 csd */ typedef struct __call_single_data call_single_data_t __aligned(sizeof(struct __call_single_data)); +#define INIT_CSD(_csd, _func, _info) \ +do { \ + *(_csd) = CSD_INIT((_func), (_info)); \ +} while (0) + /* * Enqueue a llist_node on the call_single_queue; be very careful, read * flush_smp_call_function_queue() in detail. @@ -51,35 +50,70 @@ extern unsigned int total_cpus; int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, int wait); +void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, + void *info, bool wait, const struct cpumask *mask); + +int smp_call_function_single_async(int cpu, call_single_data_t *csd); + /* - * Call a function on all processors + * Cpus stopping functions in panic. All have default weak definitions. + * Architecture-dependent code may override them. */ -void on_each_cpu(smp_call_func_t func, void *info, int wait); +void __noreturn panic_smp_self_stop(void); +void __noreturn nmi_panic_self_stop(struct pt_regs *regs); +void crash_smp_send_stop(void); /* - * Call a function on processors specified by mask, which might include - * the local one. + * Call a function on all processors */ -void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, - void *info, bool wait); +static inline void on_each_cpu(smp_call_func_t func, void *info, int wait) +{ + on_each_cpu_cond_mask(NULL, func, info, wait, cpu_online_mask); +} + +/** + * on_each_cpu_mask(): Run a function on processors specified by + * cpumask, which may include the local processor. + * @mask: The set of cpus to run on (only runs on online subset). + * @func: The function to run. This must be fast and non-blocking. + * @info: An arbitrary pointer to pass to the function. + * @wait: If true, wait (atomically) until function has completed + * on other CPUs. + * + * If @wait is true, then returns once @func has returned. + * + * You must not call this function with disabled interrupts or from a + * hardware interrupt handler or from a bottom half handler. The + * exception is that it may be used during early boot while + * early_boot_irqs_disabled is set. + */ +static inline void on_each_cpu_mask(const struct cpumask *mask, + smp_call_func_t func, void *info, bool wait) +{ + on_each_cpu_cond_mask(NULL, func, info, wait, mask); +} /* * Call a function on each processor for which the supplied function * cond_func returns a positive value. This may include the local - * processor. + * processor. May be used during early boot while early_boot_irqs_disabled is + * set. Use local_irq_save/restore() instead of local_irq_disable/enable(). */ -void on_each_cpu_cond(smp_cond_func_t cond_func, smp_call_func_t func, - void *info, bool wait); - -void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, - void *info, bool wait, const struct cpumask *mask); +static inline void on_each_cpu_cond(smp_cond_func_t cond_func, + smp_call_func_t func, void *info, bool wait) +{ + on_each_cpu_cond_mask(cond_func, func, info, wait, cpu_online_mask); +} -int smp_call_function_single_async(int cpu, call_single_data_t *csd); +/* + * Architecture specific boot CPU setup. Defined as empty weak function in + * init/main.c. Architectures can override it. + */ +void __init smp_prepare_boot_cpu(void); #ifdef CONFIG_SMP #include <linux/preempt.h> -#include <linux/kernel.h> #include <linux/compiler.h> #include <linux/thread_info.h> #include <asm/smp.h> @@ -97,8 +131,15 @@ extern void smp_send_stop(void); /* * sends a 'reschedule' event to another CPU: */ -extern void smp_send_reschedule(int cpu); - +extern void arch_smp_send_reschedule(int cpu); +/* + * scheduler_ipi() is inline so can't be passed as callback reason, but the + * callsite IP should be sufficient for root-causing IPIs sent from here. + */ +#define smp_send_reschedule(cpu) ({ \ + trace_ipi_send_cpu(cpu, _RET_IP_, NULL); \ + arch_smp_send_reschedule(cpu); \ +}) /* * Prepare machine for booting other CPUs. @@ -136,12 +177,6 @@ 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); @@ -168,7 +203,6 @@ static inline void up_smp_call_function(smp_call_func_t func, void *info) (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) { } @@ -183,6 +217,8 @@ smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, static inline void kick_all_cpus_sync(void) { } static inline void wake_up_all_idle_cpus(void) { } +#define setup_max_cpus 0 + #ifdef CONFIG_UP_LATE_INIT extern void __init up_late_init(void); static inline void smp_init(void) { up_late_init(); } @@ -226,7 +262,7 @@ static inline int get_boot_cpu_id(void) * regular asm read for the stable. */ #ifndef __smp_processor_id -#define __smp_processor_id(x) raw_smp_processor_id(x) +#define __smp_processor_id() raw_smp_processor_id() #endif #ifdef CONFIG_DEBUG_PREEMPT @@ -258,4 +294,10 @@ int smpcfd_prepare_cpu(unsigned int cpu); int smpcfd_dead_cpu(unsigned int cpu); int smpcfd_dying_cpu(unsigned int cpu); +#ifdef CONFIG_CSD_LOCK_WAIT_DEBUG +bool csd_lock_is_stuck(void); +#else +static inline bool csd_lock_is_stuck(void) { return false; } +#endif + #endif /* __LINUX_SMP_H */ |