/* SPDX-License-Identifier: GPL-2.0 */
/*
* 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 MAX_SPARSE_IRQS INT_MAX
#else
# define MAX_SPARSE_IRQS 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
* IRQTF_READY - signals that irq thread is ready
*/
enum {
IRQTF_RUNTHREAD,
IRQTF_WARNED,
IRQTF_AFFINITY,
IRQTF_FORCED_THREAD,
IRQTF_READY,
};
/*
* 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 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 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,
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,
IRQS_NMI = 0x00002000,
IRQS_SYSFS = 0x00004000,
};
#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_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_shutdown(struct irq_desc *desc);
extern void irq_shutdown_and_deactivate(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);
extern unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask);
#ifdef CONFIG_SPARSE_IRQ
static inline void irq_mark_irq(unsigned int irq) { }
#else
extern void irq_mark_irq(unsigned int irq);
#endif
extern int __irq_get_irqchip_state(struct irq_data *data,
enum irqchip_irq_state which,
bool *state);
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 :*/
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);
bool irq_wait_for_poll(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);
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 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->action; 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;
}
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
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);
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 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;
}
static inline bool handle_enforce_irqctx(struct irq_data *data)
{
return irqd_is_handle_enforce_irqctx(data);
}
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;
}
static inline bool handle_enforce_irqctx(struct irq_data *data)
{
return false;
}
#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 */
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