diff options
Diffstat (limited to 'kernel/irq/internals.h')
| -rw-r--r-- | kernel/irq/internals.h | 428 |
1 files changed, 385 insertions, 43 deletions
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 001fa5bab490..0164ca48da59 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * IRQ subsystem internal functions and variables: * @@ -6,16 +7,22 @@ * of this file for your non core code. */ #include <linux/irqdesc.h> +#include <linux/kernel_stat.h> +#include <linux/pm_runtime.h> +#include <linux/sched/clock.h> #ifdef CONFIG_SPARSE_IRQ -# define IRQ_BITMAP_BITS (NR_IRQS + 8196) +# define MAX_SPARSE_IRQS INT_MAX #else -# define IRQ_BITMAP_BITS NR_IRQS +# define MAX_SPARSE_IRQS NR_IRQS #endif #define istate core_internal_state__do_not_mess_with_it extern bool noirqdebug; +extern int irq_poll_cpu; + +extern struct irqaction chained_action; /* * Bits used by threaded handlers: @@ -23,26 +30,33 @@ extern bool noirqdebug; * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed * IRQTF_AFFINITY - irq thread is requested to adjust affinity * IRQTF_FORCED_THREAD - irq action is force threaded + * IRQTF_READY - signals that irq thread is ready */ enum { IRQTF_RUNTHREAD, IRQTF_WARNED, IRQTF_AFFINITY, IRQTF_FORCED_THREAD, + IRQTF_READY, }; /* - * Bit masks for desc->state + * Bit masks for desc->core_internal_state__do_not_mess_with_it * * IRQS_AUTODETECT - autodetection in progress * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt * detection * IRQS_POLL_INPROGRESS - polling in progress * IRQS_ONESHOT - irq is not unmasked in primary handler - * IRQS_REPLAY - irq is replayed + * IRQS_REPLAY - irq has been resent and will not be resent + * again until the handler has run and cleared + * this flag. * IRQS_WAITING - irq is waiting - * IRQS_PENDING - irq is pending and replayed later + * IRQS_PENDING - irq needs to be resent and should be resent + * at the next available opportunity. * IRQS_SUSPENDED - irq is suspended + * IRQS_NMI - irq line is used to deliver NMIs + * IRQS_SYSFS - descriptor has been added to sysfs */ enum { IRQS_AUTODETECT = 0x00000001, @@ -53,35 +67,55 @@ enum { IRQS_WAITING = 0x00000080, IRQS_PENDING = 0x00000200, IRQS_SUSPENDED = 0x00000800, + IRQS_TIMINGS = 0x00001000, + IRQS_NMI = 0x00002000, + IRQS_SYSFS = 0x00004000, }; #include "debug.h" #include "settings.h" -#define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data) +extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); +extern void __disable_irq(struct irq_desc *desc); +extern void __enable_irq(struct irq_desc *desc); + +#define IRQ_RESEND true +#define IRQ_NORESEND false + +#define IRQ_START_FORCE true +#define IRQ_START_COND false -extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, - unsigned long flags); -extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp); -extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume); +extern int irq_activate(struct irq_desc *desc); +extern int irq_activate_and_startup(struct irq_desc *desc, bool resend); +extern int irq_startup(struct irq_desc *desc, bool resend, bool force); +extern void irq_startup_managed(struct irq_desc *desc); -extern int irq_startup(struct irq_desc *desc, bool resend); extern void irq_shutdown(struct irq_desc *desc); -extern void irq_enable(struct irq_desc *desc); +extern void irq_shutdown_and_deactivate(struct irq_desc *desc); extern void irq_disable(struct irq_desc *desc); extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); extern void mask_irq(struct irq_desc *desc); extern void unmask_irq(struct irq_desc *desc); +extern void unmask_threaded_irq(struct irq_desc *desc); -extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); +#ifdef CONFIG_SPARSE_IRQ +static inline void irq_mark_irq(unsigned int irq) { } +#else +extern void irq_mark_irq(unsigned int irq); +#endif -irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action); +irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc); +irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); irqreturn_t handle_irq_event(struct irq_desc *desc); /* Resending of interrupts :*/ -void check_irq_resend(struct irq_desc *desc, unsigned int irq); -bool irq_wait_for_poll(struct irq_desc *desc); +int check_irq_resend(struct irq_desc *desc, bool inject); +void clear_irq_resend(struct irq_desc *desc); +void irq_resend_init(struct irq_desc *desc); +void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); + +void wake_threads_waitq(struct irq_desc *desc); #ifdef CONFIG_PROC_FS extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); @@ -97,13 +131,21 @@ static inline void unregister_handler_proc(unsigned int irq, struct irqaction *action) { } #endif -extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask); - -extern void irq_set_thread_affinity(struct irq_desc *desc); +extern bool irq_can_set_affinity_usr(unsigned int irq); extern int irq_do_set_affinity(struct irq_data *data, const struct cpumask *dest, bool force); +#ifdef CONFIG_SMP +extern int irq_setup_affinity(struct irq_desc *desc); +#else +static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; } +#endif + + +#define for_each_action_of_desc(desc, act) \ + for (act = desc->action; act; act = act->next) + /* Inline functions for support of irq chips on slow busses */ static inline void chip_bus_lock(struct irq_desc *desc) { @@ -123,33 +165,38 @@ static inline void chip_bus_sync_unlock(struct irq_desc *desc) #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) -struct irq_desc * -__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, - unsigned int check); +struct irq_desc *__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, + unsigned int check); void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); -static inline struct irq_desc * -irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) -{ - return __irq_get_desc_lock(irq, flags, true, check); -} +__DEFINE_CLASS_IS_CONDITIONAL(irqdesc_lock, true); +__DEFINE_UNLOCK_GUARD(irqdesc_lock, struct irq_desc, + __irq_put_desc_unlock(_T->lock, _T->flags, _T->bus), + unsigned long flags; bool bus); -static inline void -irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) +static inline class_irqdesc_lock_t class_irqdesc_lock_constructor(unsigned int irq, bool bus, + unsigned int check) { - __irq_put_desc_unlock(desc, flags, true); -} + class_irqdesc_lock_t _t = { .bus = bus, }; -static inline struct irq_desc * -irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) -{ - return __irq_get_desc_lock(irq, flags, false, check); + _t.lock = __irq_get_desc_lock(irq, &_t.flags, bus, check); + + return _t; } -static inline void -irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) +#define scoped_irqdesc_get_and_lock(_irq, _check) \ + scoped_guard(irqdesc_lock, _irq, false, _check) + +#define scoped_irqdesc_get_and_buslock(_irq, _check) \ + scoped_guard(irqdesc_lock, _irq, true, _check) + +#define scoped_irqdesc ((struct irq_desc *)(__guard_ptr(irqdesc_lock)(&scope))) + +#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) + +static inline unsigned int irqd_get(struct irq_data *d) { - __irq_put_desc_unlock(desc, flags, false); + return __irqd_to_state(d); } /* @@ -157,25 +204,320 @@ irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) */ static inline void irqd_set_move_pending(struct irq_data *d) { - d->state_use_accessors |= IRQD_SETAFFINITY_PENDING; + __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; } static inline void irqd_clr_move_pending(struct irq_data *d) { - d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING; + __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; +} + +static inline void irqd_set_managed_shutdown(struct irq_data *d) +{ + __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; +} + +static inline void irqd_clr_managed_shutdown(struct irq_data *d) +{ + __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; } static inline void irqd_clear(struct irq_data *d, unsigned int mask) { - d->state_use_accessors &= ~mask; + __irqd_to_state(d) &= ~mask; } static inline void irqd_set(struct irq_data *d, unsigned int mask) { - d->state_use_accessors |= mask; + __irqd_to_state(d) |= mask; } static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) { - return d->state_use_accessors & mask; + return __irqd_to_state(d) & mask; +} + +static inline void irq_state_set_disabled(struct irq_desc *desc) +{ + irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); +} + +static inline void irq_state_set_masked(struct irq_desc *desc) +{ + irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); +} + +#undef __irqd_to_state + +static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc) +{ + __this_cpu_inc(desc->kstat_irqs->cnt); + __this_cpu_inc(kstat.irqs_sum); +} + +static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) +{ + __kstat_incr_irqs_this_cpu(desc); + desc->tot_count++; +} + +static inline int irq_desc_get_node(struct irq_desc *desc) +{ + return irq_common_data_get_node(&desc->irq_common_data); +} + +static inline int irq_desc_is_chained(struct irq_desc *desc) +{ + return (desc->action && desc->action == &chained_action); +} + +static inline bool irq_is_nmi(struct irq_desc *desc) +{ + return desc->istate & IRQS_NMI; +} + +#ifdef CONFIG_PM_SLEEP +void irq_pm_handle_wakeup(struct irq_desc *desc); +void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); +void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); +#else +static inline void irq_pm_handle_wakeup(struct irq_desc *desc) { } +static inline void +irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } +static inline void +irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } +#endif + +#ifdef CONFIG_IRQ_TIMINGS + +#define IRQ_TIMINGS_SHIFT 5 +#define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT) +#define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1) + +/** + * struct irq_timings - irq timings storing structure + * @values: a circular buffer of u64 encoded <timestamp,irq> values + * @count: the number of elements in the array + */ +struct irq_timings { + u64 values[IRQ_TIMINGS_SIZE]; + int count; +}; + +DECLARE_PER_CPU(struct irq_timings, irq_timings); + +extern void irq_timings_free(int irq); +extern int irq_timings_alloc(int irq); + +static inline void irq_remove_timings(struct irq_desc *desc) +{ + desc->istate &= ~IRQS_TIMINGS; + + irq_timings_free(irq_desc_get_irq(desc)); +} + +static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act) +{ + int irq = irq_desc_get_irq(desc); + int ret; + + /* + * We don't need the measurement because the idle code already + * knows the next expiry event. + */ + if (act->flags & __IRQF_TIMER) + return; + + /* + * In case the timing allocation fails, we just want to warn, + * not fail, so letting the system boot anyway. + */ + ret = irq_timings_alloc(irq); + if (ret) { + pr_warn("Failed to allocate irq timing stats for irq%d (%d)", + irq, ret); + return; + } + + desc->istate |= IRQS_TIMINGS; +} + +extern void irq_timings_enable(void); +extern void irq_timings_disable(void); + +DECLARE_STATIC_KEY_FALSE(irq_timing_enabled); + +/* + * The interrupt number and the timestamp are encoded into a single + * u64 variable to optimize the size. + * 48 bit time stamp and 16 bit IRQ number is way sufficient. + * Who cares an IRQ after 78 hours of idle time? + */ +static inline u64 irq_timing_encode(u64 timestamp, int irq) +{ + return (timestamp << 16) | irq; +} + +static inline int irq_timing_decode(u64 value, u64 *timestamp) +{ + *timestamp = value >> 16; + return value & U16_MAX; +} + +static __always_inline void irq_timings_push(u64 ts, int irq) +{ + struct irq_timings *timings = this_cpu_ptr(&irq_timings); + + timings->values[timings->count & IRQ_TIMINGS_MASK] = + irq_timing_encode(ts, irq); + + timings->count++; +} + +/* + * The function record_irq_time is only called in one place in the + * interrupts handler. We want this function always inline so the code + * inside is embedded in the function and the static key branching + * code can act at the higher level. Without the explicit + * __always_inline we can end up with a function call and a small + * overhead in the hotpath for nothing. + */ +static __always_inline void record_irq_time(struct irq_desc *desc) +{ + if (!static_branch_likely(&irq_timing_enabled)) + return; + + if (desc->istate & IRQS_TIMINGS) + irq_timings_push(local_clock(), irq_desc_get_irq(desc)); +} +#else +static inline void irq_remove_timings(struct irq_desc *desc) {} +static inline void irq_setup_timings(struct irq_desc *desc, + struct irqaction *act) {}; +static inline void record_irq_time(struct irq_desc *desc) {} +#endif /* CONFIG_IRQ_TIMINGS */ + + +#ifdef CONFIG_GENERIC_IRQ_CHIP +void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, + int num_ct, unsigned int irq_base, + void __iomem *reg_base, irq_flow_handler_t handler); +#else +static inline void +irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, + int num_ct, unsigned int irq_base, + void __iomem *reg_base, irq_flow_handler_t handler) { } +#endif /* CONFIG_GENERIC_IRQ_CHIP */ + +#ifdef CONFIG_GENERIC_PENDING_IRQ +static inline bool irq_can_move_pcntxt(struct irq_data *data) +{ + return !(data->chip->flags & IRQCHIP_MOVE_DEFERRED); +} +static inline bool irq_move_pending(struct irq_data *data) +{ + return irqd_is_setaffinity_pending(data); +} +static inline void +irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) +{ + cpumask_copy(desc->pending_mask, mask); +} +static inline void +irq_get_pending(struct cpumask *mask, struct irq_desc *desc) +{ + cpumask_copy(mask, desc->pending_mask); +} +static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) +{ + return desc->pending_mask; +} +bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); +void irq_force_complete_move(struct irq_desc *desc); +#else /* CONFIG_GENERIC_PENDING_IRQ */ +static inline bool irq_can_move_pcntxt(struct irq_data *data) +{ + return true; +} +static inline bool irq_move_pending(struct irq_data *data) +{ + return false; +} +static inline void +irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) +{ +} +static inline void +irq_get_pending(struct cpumask *mask, struct irq_desc *desc) +{ +} +static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) +{ + return NULL; +} +static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) +{ + return false; +} +static inline void irq_force_complete_move(struct irq_desc *desc) { } +#endif /* !CONFIG_GENERIC_PENDING_IRQ */ + +#if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY) +static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve) +{ + irqd_set_activated(data); + return 0; +} +static inline void irq_domain_deactivate_irq(struct irq_data *data) +{ + irqd_clr_activated(data); +} +#endif + +static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd) +{ +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY + return irqd->parent_data; +#else + return NULL; +#endif +} + +#ifdef CONFIG_GENERIC_IRQ_DEBUGFS +#include <linux/debugfs.h> + +struct irq_bit_descr { + unsigned int mask; + char *name; +}; + +#define BIT_MASK_DESCR(m) { .mask = m, .name = #m } + +void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state, + const struct irq_bit_descr *sd, int size); + +void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); +static inline void irq_remove_debugfs_entry(struct irq_desc *desc) +{ + debugfs_remove(desc->debugfs_file); + kfree(desc->dev_name); +} +void irq_debugfs_copy_devname(int irq, struct device *dev); +# ifdef CONFIG_IRQ_DOMAIN +void irq_domain_debugfs_init(struct dentry *root); +# else +static inline void irq_domain_debugfs_init(struct dentry *root) +{ +} +# endif +#else /* CONFIG_GENERIC_IRQ_DEBUGFS */ +static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) +{ +} +static inline void irq_remove_debugfs_entry(struct irq_desc *d) +{ +} +static inline void irq_debugfs_copy_devname(int irq, struct device *dev) +{ } +#endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ |