452 lines
13 KiB
C
452 lines
13 KiB
C
/*
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* IRQ subsystem internal functions and variables:
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*
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* Do not ever include this file from anything else than
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* kernel/irq/. Do not even think about using any information outside
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* of this file for your non core code.
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*/
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#include <linux/irqdesc.h>
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#include <linux/kernel_stat.h>
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#include <linux/pm_runtime.h>
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#include <linux/sched/clock.h>
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#ifdef CONFIG_SPARSE_IRQ
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# define IRQ_BITMAP_BITS (NR_IRQS + 8196)
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#else
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# define IRQ_BITMAP_BITS NR_IRQS
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#endif
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#define istate core_internal_state__do_not_mess_with_it
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extern bool noirqdebug;
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extern struct irqaction chained_action;
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/*
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* Bits used by threaded handlers:
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* IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
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* IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
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* IRQTF_AFFINITY - irq thread is requested to adjust affinity
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* IRQTF_FORCED_THREAD - irq action is force threaded
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*/
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enum {
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IRQTF_RUNTHREAD,
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IRQTF_WARNED,
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IRQTF_AFFINITY,
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IRQTF_FORCED_THREAD,
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};
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/*
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* Bit masks for desc->core_internal_state__do_not_mess_with_it
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*
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* IRQS_AUTODETECT - autodetection in progress
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* IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt
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* detection
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* IRQS_POLL_INPROGRESS - polling in progress
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* IRQS_ONESHOT - irq is not unmasked in primary handler
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* IRQS_REPLAY - irq is replayed
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* IRQS_WAITING - irq is waiting
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* IRQS_PENDING - irq is pending and replayed later
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* IRQS_SUSPENDED - irq is suspended
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*/
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enum {
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IRQS_AUTODETECT = 0x00000001,
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IRQS_SPURIOUS_DISABLED = 0x00000002,
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IRQS_POLL_INPROGRESS = 0x00000008,
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IRQS_ONESHOT = 0x00000020,
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IRQS_REPLAY = 0x00000040,
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IRQS_WAITING = 0x00000080,
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IRQS_PENDING = 0x00000200,
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IRQS_SUSPENDED = 0x00000800,
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IRQS_TIMINGS = 0x00001000,
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};
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#include "debug.h"
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#include "settings.h"
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extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
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extern void __disable_irq(struct irq_desc *desc);
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extern void __enable_irq(struct irq_desc *desc);
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#define IRQ_RESEND true
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#define IRQ_NORESEND false
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#define IRQ_START_FORCE true
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#define IRQ_START_COND false
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extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
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extern void irq_shutdown(struct irq_desc *desc);
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extern void irq_enable(struct irq_desc *desc);
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extern void irq_disable(struct irq_desc *desc);
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extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
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extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
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extern void mask_irq(struct irq_desc *desc);
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extern void unmask_irq(struct irq_desc *desc);
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extern void unmask_threaded_irq(struct irq_desc *desc);
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#ifdef CONFIG_SPARSE_IRQ
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static inline void irq_mark_irq(unsigned int irq) { }
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#else
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extern void irq_mark_irq(unsigned int irq);
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#endif
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extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
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irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
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irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
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irqreturn_t handle_irq_event(struct irq_desc *desc);
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/* Resending of interrupts :*/
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void check_irq_resend(struct irq_desc *desc);
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bool irq_wait_for_poll(struct irq_desc *desc);
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void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
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#ifdef CONFIG_PROC_FS
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extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
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extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
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extern void register_handler_proc(unsigned int irq, struct irqaction *action);
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extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
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#else
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static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
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static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
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static inline void register_handler_proc(unsigned int irq,
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struct irqaction *action) { }
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static inline void unregister_handler_proc(unsigned int irq,
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struct irqaction *action) { }
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#endif
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extern bool irq_can_set_affinity_usr(unsigned int irq);
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extern int irq_select_affinity_usr(unsigned int irq);
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extern void irq_set_thread_affinity(struct irq_desc *desc);
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extern int irq_do_set_affinity(struct irq_data *data,
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const struct cpumask *dest, bool force);
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#ifdef CONFIG_SMP
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extern int irq_setup_affinity(struct irq_desc *desc);
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#else
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static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
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#endif
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/* Inline functions for support of irq chips on slow busses */
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static inline void chip_bus_lock(struct irq_desc *desc)
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{
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if (unlikely(desc->irq_data.chip->irq_bus_lock))
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desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
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}
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static inline void chip_bus_sync_unlock(struct irq_desc *desc)
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{
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if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
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desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
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}
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#define _IRQ_DESC_CHECK (1 << 0)
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#define _IRQ_DESC_PERCPU (1 << 1)
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#define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
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#define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
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#define for_each_action_of_desc(desc, act) \
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for (act = desc->act; act; act = act->next)
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struct irq_desc *
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__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
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unsigned int check);
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void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
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static inline struct irq_desc *
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irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
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{
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return __irq_get_desc_lock(irq, flags, true, check);
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}
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static inline void
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irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
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{
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__irq_put_desc_unlock(desc, flags, true);
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}
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static inline struct irq_desc *
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irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
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{
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return __irq_get_desc_lock(irq, flags, false, check);
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}
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static inline void
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irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
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{
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__irq_put_desc_unlock(desc, flags, false);
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}
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#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
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static inline unsigned int irqd_get(struct irq_data *d)
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{
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return __irqd_to_state(d);
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}
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/*
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* Manipulation functions for irq_data.state
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*/
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static inline void irqd_set_move_pending(struct irq_data *d)
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{
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__irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
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}
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static inline void irqd_clr_move_pending(struct irq_data *d)
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{
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__irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
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}
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static inline void irqd_set_managed_shutdown(struct irq_data *d)
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{
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__irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
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}
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static inline void irqd_clr_managed_shutdown(struct irq_data *d)
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{
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__irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
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}
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static inline void irqd_clear(struct irq_data *d, unsigned int mask)
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{
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__irqd_to_state(d) &= ~mask;
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}
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static inline void irqd_set(struct irq_data *d, unsigned int mask)
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{
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__irqd_to_state(d) |= mask;
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}
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static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
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{
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return __irqd_to_state(d) & mask;
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}
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#undef __irqd_to_state
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static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
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{
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__this_cpu_inc(*desc->kstat_irqs);
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__this_cpu_inc(kstat.irqs_sum);
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}
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static inline int irq_desc_get_node(struct irq_desc *desc)
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{
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return irq_common_data_get_node(&desc->irq_common_data);
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}
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static inline int irq_desc_is_chained(struct irq_desc *desc)
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{
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return (desc->action && desc->action == &chained_action);
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}
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#ifdef CONFIG_PM_SLEEP
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bool irq_pm_check_wakeup(struct irq_desc *desc);
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void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
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void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
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#else
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static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
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static inline void
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irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
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static inline void
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irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
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#endif
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#ifdef CONFIG_IRQ_TIMINGS
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#define IRQ_TIMINGS_SHIFT 5
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#define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
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#define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
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/**
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* struct irq_timings - irq timings storing structure
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* @values: a circular buffer of u64 encoded <timestamp,irq> values
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* @count: the number of elements in the array
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*/
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struct irq_timings {
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u64 values[IRQ_TIMINGS_SIZE];
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int count;
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};
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DECLARE_PER_CPU(struct irq_timings, irq_timings);
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extern void irq_timings_free(int irq);
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extern int irq_timings_alloc(int irq);
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static inline void irq_remove_timings(struct irq_desc *desc)
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{
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desc->istate &= ~IRQS_TIMINGS;
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irq_timings_free(irq_desc_get_irq(desc));
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}
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static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
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{
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int irq = irq_desc_get_irq(desc);
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int ret;
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/*
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* We don't need the measurement because the idle code already
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* knows the next expiry event.
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*/
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if (act->flags & __IRQF_TIMER)
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return;
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/*
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* In case the timing allocation fails, we just want to warn,
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* not fail, so letting the system boot anyway.
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*/
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ret = irq_timings_alloc(irq);
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if (ret) {
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pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
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irq, ret);
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return;
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}
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desc->istate |= IRQS_TIMINGS;
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}
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extern void irq_timings_enable(void);
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extern void irq_timings_disable(void);
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DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
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/*
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* The interrupt number and the timestamp are encoded into a single
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* u64 variable to optimize the size.
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* 48 bit time stamp and 16 bit IRQ number is way sufficient.
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* Who cares an IRQ after 78 hours of idle time?
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*/
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static inline u64 irq_timing_encode(u64 timestamp, int irq)
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{
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return (timestamp << 16) | irq;
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}
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static inline int irq_timing_decode(u64 value, u64 *timestamp)
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{
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*timestamp = value >> 16;
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return value & U16_MAX;
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}
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/*
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* The function record_irq_time is only called in one place in the
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* interrupts handler. We want this function always inline so the code
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* inside is embedded in the function and the static key branching
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* code can act at the higher level. Without the explicit
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* __always_inline we can end up with a function call and a small
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* overhead in the hotpath for nothing.
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*/
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static __always_inline void record_irq_time(struct irq_desc *desc)
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{
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if (!static_branch_likely(&irq_timing_enabled))
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return;
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if (desc->istate & IRQS_TIMINGS) {
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struct irq_timings *timings = this_cpu_ptr(&irq_timings);
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timings->values[timings->count & IRQ_TIMINGS_MASK] =
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irq_timing_encode(local_clock(),
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irq_desc_get_irq(desc));
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timings->count++;
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}
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}
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#else
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static inline void irq_remove_timings(struct irq_desc *desc) {}
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static inline void irq_setup_timings(struct irq_desc *desc,
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struct irqaction *act) {};
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static inline void record_irq_time(struct irq_desc *desc) {}
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#endif /* CONFIG_IRQ_TIMINGS */
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#ifdef CONFIG_GENERIC_IRQ_CHIP
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void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
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int num_ct, unsigned int irq_base,
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void __iomem *reg_base, irq_flow_handler_t handler);
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#else
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static inline void
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irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
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int num_ct, unsigned int irq_base,
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void __iomem *reg_base, irq_flow_handler_t handler) { }
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#endif /* CONFIG_GENERIC_IRQ_CHIP */
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#ifdef CONFIG_GENERIC_PENDING_IRQ
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static inline bool irq_can_move_pcntxt(struct irq_data *data)
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{
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return irqd_can_move_in_process_context(data);
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}
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static inline bool irq_move_pending(struct irq_data *data)
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{
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return irqd_is_setaffinity_pending(data);
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}
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static inline void
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irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
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{
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cpumask_copy(desc->pending_mask, mask);
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}
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static inline void
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irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
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{
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cpumask_copy(mask, desc->pending_mask);
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}
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static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
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{
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return desc->pending_mask;
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}
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bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
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#else /* CONFIG_GENERIC_PENDING_IRQ */
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static inline bool irq_can_move_pcntxt(struct irq_data *data)
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{
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return true;
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}
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static inline bool irq_move_pending(struct irq_data *data)
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{
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return false;
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}
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static inline void
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irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
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{
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}
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static inline void
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irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
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{
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}
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static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
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{
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return NULL;
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}
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static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
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{
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return false;
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}
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#endif /* !CONFIG_GENERIC_PENDING_IRQ */
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#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
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#include <linux/debugfs.h>
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void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
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static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
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{
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debugfs_remove(desc->debugfs_file);
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}
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# ifdef CONFIG_IRQ_DOMAIN
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void irq_domain_debugfs_init(struct dentry *root);
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# else
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static inline void irq_domain_debugfs_init(struct dentry *root)
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{
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}
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# endif
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#else /* CONFIG_GENERIC_IRQ_DEBUGFS */
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static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
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{
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}
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static inline void irq_remove_debugfs_entry(struct irq_desc *d)
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{
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}
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#endif /* CONFIG_GENERIC_IRQ_DEBUGFS */
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