| /* |
| * IRQ subsystem internal functions and variables: |
| * |
| * Do not ever include this file from anything else than |
| * kernel/irq/. Do not even think about using any information outside |
| * 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) |
| #else |
| # define IRQ_BITMAP_BITS NR_IRQS |
| #endif |
| |
| #define istate core_internal_state__do_not_mess_with_it |
| |
| extern bool noirqdebug; |
| |
| extern struct irqaction chained_action; |
| |
| /* |
| * Bits used by threaded handlers: |
| * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run |
| * 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 |
| */ |
| enum { |
| IRQTF_RUNTHREAD, |
| IRQTF_WARNED, |
| IRQTF_AFFINITY, |
| IRQTF_FORCED_THREAD, |
| }; |
| |
| /* |
| * 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_WAITING - irq is waiting |
| * IRQS_PENDING - irq is pending and replayed later |
| * IRQS_SUSPENDED - irq is suspended |
| */ |
| enum { |
| IRQS_AUTODETECT = 0x00000001, |
| IRQS_SPURIOUS_DISABLED = 0x00000002, |
| IRQS_POLL_INPROGRESS = 0x00000008, |
| IRQS_ONESHOT = 0x00000020, |
| IRQS_REPLAY = 0x00000040, |
| IRQS_WAITING = 0x00000080, |
| IRQS_PENDING = 0x00000200, |
| IRQS_SUSPENDED = 0x00000800, |
| IRQS_TIMINGS = 0x00001000, |
| }; |
| |
| #include "debug.h" |
| #include "settings.h" |
| |
| 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_startup(struct irq_desc *desc, bool resend, bool force); |
| |
| extern void irq_shutdown(struct irq_desc *desc); |
| extern void irq_enable(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); |
| |
| #ifdef CONFIG_SPARSE_IRQ |
| static inline void irq_mark_irq(unsigned int irq) { } |
| #else |
| extern void irq_mark_irq(unsigned int irq); |
| #endif |
| |
| extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); |
| |
| irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags); |
| 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); |
| bool irq_wait_for_poll(struct irq_desc *desc); |
| void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); |
| |
| #ifdef CONFIG_PROC_FS |
| extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); |
| extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); |
| extern void register_handler_proc(unsigned int irq, struct irqaction *action); |
| extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); |
| #else |
| static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } |
| static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } |
| static inline void register_handler_proc(unsigned int irq, |
| struct irqaction *action) { } |
| static inline void unregister_handler_proc(unsigned int irq, |
| struct irqaction *action) { } |
| #endif |
| |
| extern bool irq_can_set_affinity_usr(unsigned int irq); |
| |
| extern int irq_select_affinity_usr(unsigned int irq); |
| |
| extern void irq_set_thread_affinity(struct irq_desc *desc); |
| |
| 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 |
| |
| /* Inline functions for support of irq chips on slow busses */ |
| static inline void chip_bus_lock(struct irq_desc *desc) |
| { |
| if (unlikely(desc->irq_data.chip->irq_bus_lock)) |
| desc->irq_data.chip->irq_bus_lock(&desc->irq_data); |
| } |
| |
| static inline void chip_bus_sync_unlock(struct irq_desc *desc) |
| { |
| if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) |
| desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); |
| } |
| |
| #define _IRQ_DESC_CHECK (1 << 0) |
| #define _IRQ_DESC_PERCPU (1 << 1) |
| |
| #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) |
| #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) |
| |
| #define for_each_action_of_desc(desc, act) \ |
| for (act = desc->act; act; act = act->next) |
| |
| 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); |
| } |
| |
| static inline void |
| irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) |
| { |
| __irq_put_desc_unlock(desc, flags, true); |
| } |
| |
| 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); |
| } |
| |
| static inline void |
| irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) |
| { |
| __irq_put_desc_unlock(desc, flags, false); |
| } |
| |
| #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) |
| |
| static inline unsigned int irqd_get(struct irq_data *d) |
| { |
| return __irqd_to_state(d); |
| } |
| |
| /* |
| * Manipulation functions for irq_data.state |
| */ |
| static inline void irqd_set_move_pending(struct irq_data *d) |
| { |
| __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; |
| } |
| |
| static inline void irqd_clr_move_pending(struct irq_data *d) |
| { |
| __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) |
| { |
| __irqd_to_state(d) &= ~mask; |
| } |
| |
| static inline void irqd_set(struct irq_data *d, unsigned int mask) |
| { |
| __irqd_to_state(d) |= mask; |
| } |
| |
| static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) |
| { |
| return __irqd_to_state(d) & mask; |
| } |
| |
| #undef __irqd_to_state |
| |
| static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) |
| { |
| __this_cpu_inc(*desc->kstat_irqs); |
| __this_cpu_inc(kstat.irqs_sum); |
| } |
| |
| 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); |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| bool irq_pm_check_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 bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } |
| 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); |
| |
| static inline void irq_remove_timings(struct irq_desc *desc) |
| { |
| desc->istate &= ~IRQS_TIMINGS; |
| } |
| |
| static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act) |
| { |
| /* |
| * We don't need the measurement because the idle code already |
| * knows the next expiry event. |
| */ |
| if (act->flags & __IRQF_TIMER) |
| 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; |
| } |
| |
| /* |
| * 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) { |
| struct irq_timings *timings = this_cpu_ptr(&irq_timings); |
| |
| timings->values[timings->count & IRQ_TIMINGS_MASK] = |
| irq_timing_encode(local_clock(), |
| irq_desc_get_irq(desc)); |
| |
| timings->count++; |
| } |
| } |
| #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 irqd_can_move_in_process_context(data); |
| } |
| 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); |
| #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; |
| } |
| #endif /* !CONFIG_GENERIC_PENDING_IRQ */ |
| |
| #ifdef CONFIG_GENERIC_IRQ_DEBUGFS |
| #include <linux/debugfs.h> |
| |
| 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); |
| } |
| # 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) |
| { |
| } |
| #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ |