Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
 * Copyright (C) 2005-2006 Thomas Gleixner
 *
 * This file contains driver APIs to the irq subsystem.
 */
 
#define pr_fmt(fmt) "genirq: " fmt
 
#include <linux/irq.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/sched/rt.h>
#include <linux/sched/task.h>
#include <linux/sched/isolation.h>
#include <uapi/linux/sched/types.h>
#include <linux/task_work.h>
 
#include "internals.h"
 
#if defined(CONFIG_IRQ_FORCED_THREADING) && !defined(CONFIG_PREEMPT_RT)
__read_mostly bool force_irqthreads;
EXPORT_SYMBOL_GPL(force_irqthreads);
 
static int __init setup_forced_irqthreads(char *arg)
{
<------>force_irqthreads = true;
<------>return 0;
}
early_param("threadirqs", setup_forced_irqthreads);
#endif
 
static void __synchronize_hardirq(struct irq_desc *desc, bool sync_chip)
{
<------>struct irq_data *irqd = irq_desc_get_irq_data(desc);
<------>bool inprogress;
 
<------>do {
<------><------>unsigned long flags;
 
<------><------>/*
<------><------> * Wait until we're out of the critical section.  This might
<------><------> * give the wrong answer due to the lack of memory barriers.
<------><------> */
<------><------>while (irqd_irq_inprogress(&desc->irq_data))
<------><------><------>cpu_relax();
 
<------><------>/* Ok, that indicated we're done: double-check carefully. */
<------><------>raw_spin_lock_irqsave(&desc->lock, flags);
<------><------>inprogress = irqd_irq_inprogress(&desc->irq_data);
 
<------><------>/*
<------><------> * If requested and supported, check at the chip whether it
<------><------> * is in flight at the hardware level, i.e. already pending
<------><------> * in a CPU and waiting for service and acknowledge.
<------><------> */
<------><------>if (!inprogress && sync_chip) {
<------><------><------>/*
<------><------><------> * Ignore the return code. inprogress is only updated
<------><------><------> * when the chip supports it.
<------><------><------> */
<------><------><------>__irq_get_irqchip_state(irqd, IRQCHIP_STATE_ACTIVE,
<------><------><------><------><------><------>&inprogress);
<------><------>}
<------><------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------><------>/* Oops, that failed? */
<------>} while (inprogress);
}
 
/**
 *	synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs)
 *	@irq: interrupt number to wait for
 *
 *	This function waits for any pending hard IRQ handlers for this
 *	interrupt to complete before returning. If you use this
 *	function while holding a resource the IRQ handler may need you
 *	will deadlock. It does not take associated threaded handlers
 *	into account.
 *
 *	Do not use this for shutdown scenarios where you must be sure
 *	that all parts (hardirq and threaded handler) have completed.
 *
 *	Returns: false if a threaded handler is active.
 *
 *	This function may be called - with care - from IRQ context.
 *
 *	It does not check whether there is an interrupt in flight at the
 *	hardware level, but not serviced yet, as this might deadlock when
 *	called with interrupts disabled and the target CPU of the interrupt
 *	is the current CPU.
 */
bool synchronize_hardirq(unsigned int irq)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
 
<------>if (desc) {
<------><------>__synchronize_hardirq(desc, false);
<------><------>return !atomic_read(&desc->threads_active);
<------>}
 
<------>return true;
}
EXPORT_SYMBOL(synchronize_hardirq);
 
/**
 *	synchronize_irq - wait for pending IRQ handlers (on other CPUs)
 *	@irq: interrupt number to wait for
 *
 *	This function waits for any pending IRQ handlers for this interrupt
 *	to complete before returning. If you use this function while
 *	holding a resource the IRQ handler may need you will deadlock.
 *
 *	Can only be called from preemptible code as it might sleep when
 *	an interrupt thread is associated to @irq.
 *
 *	It optionally makes sure (when the irq chip supports that method)
 *	that the interrupt is not pending in any CPU and waiting for
 *	service.
 */
void synchronize_irq(unsigned int irq)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
 
<------>if (desc) {
<------><------>__synchronize_hardirq(desc, true);
<------><------>/*
<------><------> * We made sure that no hardirq handler is
<------><------> * running. Now verify that no threaded handlers are
<------><------> * active.
<------><------> */
<------><------>wait_event(desc->wait_for_threads,
<------><------><------>   !atomic_read(&desc->threads_active));
<------>}
}
EXPORT_SYMBOL(synchronize_irq);
 
#ifdef CONFIG_SMP
cpumask_var_t irq_default_affinity;
 
static bool __irq_can_set_affinity(struct irq_desc *desc)
{
<------>if (!desc || !irqd_can_balance(&desc->irq_data) ||
<------>    !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity)
<------><------>return false;
<------>return true;
}
 
/**
 *	irq_can_set_affinity - Check if the affinity of a given irq can be set
 *	@irq:		Interrupt to check
 *
 */
int irq_can_set_affinity(unsigned int irq)
{
<------>return __irq_can_set_affinity(irq_to_desc(irq));
}
 
/**
 * irq_can_set_affinity_usr - Check if affinity of a irq can be set from user space
 * @irq:	Interrupt to check
 *
 * Like irq_can_set_affinity() above, but additionally checks for the
 * AFFINITY_MANAGED flag.
 */
bool irq_can_set_affinity_usr(unsigned int irq)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
 
<------>return __irq_can_set_affinity(desc) &&
<------><------>!irqd_affinity_is_managed(&desc->irq_data);
}
 
/**
 *	irq_set_thread_affinity - Notify irq threads to adjust affinity
 *	@desc:		irq descriptor which has affitnity changed
 *
 *	We just set IRQTF_AFFINITY and delegate the affinity setting
 *	to the interrupt thread itself. We can not call
 *	set_cpus_allowed_ptr() here as we hold desc->lock and this
 *	code can be called from hard interrupt context.
 */
void irq_set_thread_affinity(struct irq_desc *desc)
{
<------>struct irqaction *action;
 
<------>for_each_action_of_desc(desc, action)
<------><------>if (action->thread)
<------><------><------>set_bit(IRQTF_AFFINITY, &action->thread_flags);
}
 
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
static void irq_validate_effective_affinity(struct irq_data *data)
{
<------>const struct cpumask *m = irq_data_get_effective_affinity_mask(data);
<------>struct irq_chip *chip = irq_data_get_irq_chip(data);
 
<------>if (!cpumask_empty(m))
<------><------>return;
<------>pr_warn_once("irq_chip %s did not update eff. affinity mask of irq %u\n",
<------><------>     chip->name, data->irq);
}
 
static inline void irq_init_effective_affinity(struct irq_data *data,
<------><------><------><------><------>       const struct cpumask *mask)
{
<------>cpumask_copy(irq_data_get_effective_affinity_mask(data), mask);
}
#else
static inline void irq_validate_effective_affinity(struct irq_data *data) { }
static inline void irq_init_effective_affinity(struct irq_data *data,
<------><------><------><------><------>       const struct cpumask *mask) { }
#endif
 
int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
<------><------><------>bool force)
{
<------>struct irq_desc *desc = irq_data_to_desc(data);
<------>struct irq_chip *chip = irq_data_get_irq_chip(data);
<------>int ret;
 
<------>if (!chip || !chip->irq_set_affinity)
<------><------>return -EINVAL;
 
<------>/*
<------> * If this is a managed interrupt and housekeeping is enabled on
<------> * it check whether the requested affinity mask intersects with
<------> * a housekeeping CPU. If so, then remove the isolated CPUs from
<------> * the mask and just keep the housekeeping CPU(s). This prevents
<------> * the affinity setter from routing the interrupt to an isolated
<------> * CPU to avoid that I/O submitted from a housekeeping CPU causes
<------> * interrupts on an isolated one.
<------> *
<------> * If the masks do not intersect or include online CPU(s) then
<------> * keep the requested mask. The isolated target CPUs are only
<------> * receiving interrupts when the I/O operation was submitted
<------> * directly from them.
<------> *
<------> * If all housekeeping CPUs in the affinity mask are offline, the
<------> * interrupt will be migrated by the CPU hotplug code once a
<------> * housekeeping CPU which belongs to the affinity mask comes
<------> * online.
<------> */
<------>if (irqd_affinity_is_managed(data) &&
<------>    housekeeping_enabled(HK_FLAG_MANAGED_IRQ)) {
<------><------>const struct cpumask *hk_mask, *prog_mask;
 
<------><------>static DEFINE_RAW_SPINLOCK(tmp_mask_lock);
<------><------>static struct cpumask tmp_mask;
 
<------><------>hk_mask = housekeeping_cpumask(HK_FLAG_MANAGED_IRQ);
 
<------><------>raw_spin_lock(&tmp_mask_lock);
<------><------>cpumask_and(&tmp_mask, mask, hk_mask);
<------><------>if (!cpumask_intersects(&tmp_mask, cpu_online_mask))
<------><------><------>prog_mask = mask;
<------><------>else
<------><------><------>prog_mask = &tmp_mask;
<------><------>ret = chip->irq_set_affinity(data, prog_mask, force);
<------><------>raw_spin_unlock(&tmp_mask_lock);
<------>} else {
<------><------>ret = chip->irq_set_affinity(data, mask, force);
<------>}
<------>switch (ret) {
<------>case IRQ_SET_MASK_OK:
<------>case IRQ_SET_MASK_OK_DONE:
<------><------>cpumask_copy(desc->irq_common_data.affinity, mask);
<------><------>fallthrough;
<------>case IRQ_SET_MASK_OK_NOCOPY:
<------><------>irq_validate_effective_affinity(data);
<------><------>irq_set_thread_affinity(desc);
<------><------>ret = 0;
<------>}
 
<------>return ret;
}
EXPORT_SYMBOL_GPL(irq_do_set_affinity);
 
#ifdef CONFIG_GENERIC_PENDING_IRQ
static inline int irq_set_affinity_pending(struct irq_data *data,
<------><------><------><------><------>   const struct cpumask *dest)
{
<------>struct irq_desc *desc = irq_data_to_desc(data);
 
<------>irqd_set_move_pending(data);
<------>irq_copy_pending(desc, dest);
<------>return 0;
}
#else
static inline int irq_set_affinity_pending(struct irq_data *data,
<------><------><------><------><------>   const struct cpumask *dest)
{
<------>return -EBUSY;
}
#endif
 
static int irq_try_set_affinity(struct irq_data *data,
<------><------><------><------>const struct cpumask *dest, bool force)
{
<------>int ret = irq_do_set_affinity(data, dest, force);
 
<------>/*
<------> * In case that the underlying vector management is busy and the
<------> * architecture supports the generic pending mechanism then utilize
<------> * this to avoid returning an error to user space.
<------> */
<------>if (ret == -EBUSY && !force)
<------><------>ret = irq_set_affinity_pending(data, dest);
<------>return ret;
}
 
static bool irq_set_affinity_deactivated(struct irq_data *data,
<------><------><------><------><------> const struct cpumask *mask, bool force)
{
<------>struct irq_desc *desc = irq_data_to_desc(data);
 
<------>/*
<------> * Handle irq chips which can handle affinity only in activated
<------> * state correctly
<------> *
<------> * If the interrupt is not yet activated, just store the affinity
<------> * mask and do not call the chip driver at all. On activation the
<------> * driver has to make sure anyway that the interrupt is in a
<------> * useable state so startup works.
<------> */
<------>if (!IS_ENABLED(CONFIG_IRQ_DOMAIN_HIERARCHY) ||
<------>    irqd_is_activated(data) || !irqd_affinity_on_activate(data))
<------><------>return false;
 
<------>cpumask_copy(desc->irq_common_data.affinity, mask);
<------>irq_init_effective_affinity(data, mask);
<------>irqd_set(data, IRQD_AFFINITY_SET);
<------>return true;
}
 
int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
<------><------><------>    bool force)
{
<------>struct irq_chip *chip = irq_data_get_irq_chip(data);
<------>struct irq_desc *desc = irq_data_to_desc(data);
<------>int ret = 0;
 
<------>if (!chip || !chip->irq_set_affinity)
<------><------>return -EINVAL;
 
<------>if (irq_set_affinity_deactivated(data, mask, force))
<------><------>return 0;
 
<------>if (irq_can_move_pcntxt(data) && !irqd_is_setaffinity_pending(data)) {
<------><------>ret = irq_try_set_affinity(data, mask, force);
<------>} else {
<------><------>irqd_set_move_pending(data);
<------><------>irq_copy_pending(desc, mask);
<------>}
 
<------>if (desc->affinity_notify) {
<------><------>kref_get(&desc->affinity_notify->kref);
<------><------>if (!schedule_work(&desc->affinity_notify->work)) {
<------><------><------>/* Work was already scheduled, drop our extra ref */
<------><------><------>kref_put(&desc->affinity_notify->kref,
<------><------><------><------> desc->affinity_notify->release);
<------><------>}
<------>}
<------>irqd_set(data, IRQD_AFFINITY_SET);
 
<------>return ret;
}
 
int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>unsigned long flags;
<------>int ret;
 
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
<------>ret = irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask, force);
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
<------>return ret;
}
 
int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
{
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
<------>if (!desc)
<------><------>return -EINVAL;
<------>desc->affinity_hint = m;
<------>irq_put_desc_unlock(desc, flags);
<------>/* set the initial affinity to prevent every interrupt being on CPU0 */
<------>if (m)
<------><------>__irq_set_affinity(irq, m, false);
<------>return 0;
}
EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
 
static void irq_affinity_notify(struct work_struct *work)
{
<------>struct irq_affinity_notify *notify =
<------><------>container_of(work, struct irq_affinity_notify, work);
<------>struct irq_desc *desc = irq_to_desc(notify->irq);
<------>cpumask_var_t cpumask;
<------>unsigned long flags;
 
<------>if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL))
<------><------>goto out;
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
<------>if (irq_move_pending(&desc->irq_data))
<------><------>irq_get_pending(cpumask, desc);
<------>else
<------><------>cpumask_copy(cpumask, desc->irq_common_data.affinity);
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------>notify->notify(notify, cpumask);
 
<------>free_cpumask_var(cpumask);
out:
<------>kref_put(&notify->kref, notify->release);
}
 
/**
 *	irq_set_affinity_notifier - control notification of IRQ affinity changes
 *	@irq:		Interrupt for which to enable/disable notification
 *	@notify:	Context for notification, or %NULL to disable
 *			notification.  Function pointers must be initialised;
 *			the other fields will be initialised by this function.
 *
 *	Must be called in process context.  Notification may only be enabled
 *	after the IRQ is allocated and must be disabled before the IRQ is
 *	freed using free_irq().
 */
int
irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>struct irq_affinity_notify *old_notify;
<------>unsigned long flags;
 
<------>/* The release function is promised process context */
<------>might_sleep();
 
<------>if (!desc || desc->istate & IRQS_NMI)
<------><------>return -EINVAL;
 
<------>/* Complete initialisation of *notify */
<------>if (notify) {
<------><------>notify->irq = irq;
<------><------>kref_init(&notify->kref);
<------><------>INIT_WORK(&notify->work, irq_affinity_notify);
<------>}
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
<------>old_notify = desc->affinity_notify;
<------>desc->affinity_notify = notify;
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------>if (old_notify) {
<------><------>if (cancel_work_sync(&old_notify->work)) {
<------><------><------>/* Pending work had a ref, put that one too */
<------><------><------>kref_put(&old_notify->kref, old_notify->release);
<------><------>}
<------><------>kref_put(&old_notify->kref, old_notify->release);
<------>}
 
<------>return 0;
}
EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
 
#ifndef CONFIG_AUTO_IRQ_AFFINITY
/*
 * Generic version of the affinity autoselector.
 */
int irq_setup_affinity(struct irq_desc *desc)
{
<------>struct cpumask *set = irq_default_affinity;
<------>int ret, node = irq_desc_get_node(desc);
<------>static DEFINE_RAW_SPINLOCK(mask_lock);
<------>static struct cpumask mask;
 
<------>/* Excludes PER_CPU and NO_BALANCE interrupts */
<------>if (!__irq_can_set_affinity(desc))
<------><------>return 0;
 
<------>raw_spin_lock(&mask_lock);
<------>/*
<------> * Preserve the managed affinity setting and a userspace affinity
<------> * setup, but make sure that one of the targets is online.
<------> */
<------>if (irqd_affinity_is_managed(&desc->irq_data) ||
<------>    irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) {
<------><------>if (cpumask_intersects(desc->irq_common_data.affinity,
<------><------><------><------>       cpu_online_mask))
<------><------><------>set = desc->irq_common_data.affinity;
<------><------>else
<------><------><------>irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET);
<------>}
 
<------>cpumask_and(&mask, cpu_online_mask, set);
<------>if (cpumask_empty(&mask))
<------><------>cpumask_copy(&mask, cpu_online_mask);
 
<------>if (node != NUMA_NO_NODE) {
<------><------>const struct cpumask *nodemask = cpumask_of_node(node);
 
<------><------>/* make sure at least one of the cpus in nodemask is online */
<------><------>if (cpumask_intersects(&mask, nodemask))
<------><------><------>cpumask_and(&mask, &mask, nodemask);
<------>}
<------>ret = irq_do_set_affinity(&desc->irq_data, &mask, false);
<------>raw_spin_unlock(&mask_lock);
<------>return ret;
}
#else
/* Wrapper for ALPHA specific affinity selector magic */
int irq_setup_affinity(struct irq_desc *desc)
{
<------>return irq_select_affinity(irq_desc_get_irq(desc));
}
#endif /* CONFIG_AUTO_IRQ_AFFINITY */
#endif /* CONFIG_SMP */
 
 
/**
 *	irq_set_vcpu_affinity - Set vcpu affinity for the interrupt
 *	@irq: interrupt number to set affinity
 *	@vcpu_info: vCPU specific data or pointer to a percpu array of vCPU
 *	            specific data for percpu_devid interrupts
 *
 *	This function uses the vCPU specific data to set the vCPU
 *	affinity for an irq. The vCPU specific data is passed from
 *	outside, such as KVM. One example code path is as below:
 *	KVM -> IOMMU -> irq_set_vcpu_affinity().
 */
int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
{
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
<------>struct irq_data *data;
<------>struct irq_chip *chip;
<------>int ret = -ENOSYS;
 
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>data = irq_desc_get_irq_data(desc);
<------>do {
<------><------>chip = irq_data_get_irq_chip(data);
<------><------>if (chip && chip->irq_set_vcpu_affinity)
<------><------><------>break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
<------><------>data = data->parent_data;
#else
<------><------>data = NULL;
#endif
<------>} while (data);
 
<------>if (data)
<------><------>ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
<------>irq_put_desc_unlock(desc, flags);
 
<------>return ret;
}
EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);
 
void __disable_irq(struct irq_desc *desc)
{
<------>if (!desc->depth++)
<------><------>irq_disable(desc);
}
 
static int __disable_irq_nosync(unsigned int irq)
{
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
<------>if (!desc)
<------><------>return -EINVAL;
<------>__disable_irq(desc);
<------>irq_put_desc_busunlock(desc, flags);
<------>return 0;
}
 
/**
 *	disable_irq_nosync - disable an irq without waiting
 *	@irq: Interrupt to disable
 *
 *	Disable the selected interrupt line.  Disables and Enables are
 *	nested.
 *	Unlike disable_irq(), this function does not ensure existing
 *	instances of the IRQ handler have completed before returning.
 *
 *	This function may be called from IRQ context.
 */
void disable_irq_nosync(unsigned int irq)
{
<------>__disable_irq_nosync(irq);
}
EXPORT_SYMBOL(disable_irq_nosync);
 
/**
 *	disable_irq - disable an irq and wait for completion
 *	@irq: Interrupt to disable
 *
 *	Disable the selected interrupt line.  Enables and Disables are
 *	nested.
 *	This function waits for any pending IRQ handlers for this interrupt
 *	to complete before returning. If you use this function while
 *	holding a resource the IRQ handler may need you will deadlock.
 *
 *	This function may be called - with care - from IRQ context.
 */
void disable_irq(unsigned int irq)
{
<------>if (!__disable_irq_nosync(irq))
<------><------>synchronize_irq(irq);
}
EXPORT_SYMBOL(disable_irq);
 
/**
 *	disable_hardirq - disables an irq and waits for hardirq completion
 *	@irq: Interrupt to disable
 *
 *	Disable the selected interrupt line.  Enables and Disables are
 *	nested.
 *	This function waits for any pending hard IRQ handlers for this
 *	interrupt to complete before returning. If you use this function while
 *	holding a resource the hard IRQ handler may need you will deadlock.
 *
 *	When used to optimistically disable an interrupt from atomic context
 *	the return value must be checked.
 *
 *	Returns: false if a threaded handler is active.
 *
 *	This function may be called - with care - from IRQ context.
 */
bool disable_hardirq(unsigned int irq)
{
<------>if (!__disable_irq_nosync(irq))
<------><------>return synchronize_hardirq(irq);
 
<------>return false;
}
EXPORT_SYMBOL_GPL(disable_hardirq);
 
/**
 *	disable_nmi_nosync - disable an nmi without waiting
 *	@irq: Interrupt to disable
 *
 *	Disable the selected interrupt line. Disables and enables are
 *	nested.
 *	The interrupt to disable must have been requested through request_nmi.
 *	Unlike disable_nmi(), this function does not ensure existing
 *	instances of the IRQ handler have completed before returning.
 */
void disable_nmi_nosync(unsigned int irq)
{
<------>disable_irq_nosync(irq);
}
 
void __enable_irq(struct irq_desc *desc)
{
<------>switch (desc->depth) {
<------>case 0:
 err_out:
<------><------>WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n",
<------><------>     irq_desc_get_irq(desc));
<------><------>break;
<------>case 1: {
<------><------>if (desc->istate & IRQS_SUSPENDED)
<------><------><------>goto err_out;
<------><------>/* Prevent probing on this irq: */
<------><------>irq_settings_set_noprobe(desc);
<------><------>/*
<------><------> * Call irq_startup() not irq_enable() here because the
<------><------> * interrupt might be marked NOAUTOEN. So irq_startup()
<------><------> * needs to be invoked when it gets enabled the first
<------><------> * time. If it was already started up, then irq_startup()
<------><------> * will invoke irq_enable() under the hood.
<------><------> */
<------><------>irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
<------><------>break;
<------>}
<------>default:
<------><------>desc->depth--;
<------>}
}
 
/**
 *	enable_irq - enable handling of an irq
 *	@irq: Interrupt to enable
 *
 *	Undoes the effect of one call to disable_irq().  If this
 *	matches the last disable, processing of interrupts on this
 *	IRQ line is re-enabled.
 *
 *	This function may be called from IRQ context only when
 *	desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL !
 */
void enable_irq(unsigned int irq)
{
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
<------>if (!desc)
<------><------>return;
<------>if (WARN(!desc->irq_data.chip,
<------><------> KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
<------><------>goto out;
 
<------>__enable_irq(desc);
out:
<------>irq_put_desc_busunlock(desc, flags);
}
EXPORT_SYMBOL(enable_irq);
 
/**
 *	enable_nmi - enable handling of an nmi
 *	@irq: Interrupt to enable
 *
 *	The interrupt to enable must have been requested through request_nmi.
 *	Undoes the effect of one call to disable_nmi(). If this
 *	matches the last disable, processing of interrupts on this
 *	IRQ line is re-enabled.
 */
void enable_nmi(unsigned int irq)
{
<------>enable_irq(irq);
}
 
static int set_irq_wake_real(unsigned int irq, unsigned int on)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>int ret = -ENXIO;
 
<------>if (irq_desc_get_chip(desc)->flags &  IRQCHIP_SKIP_SET_WAKE)
<------><------>return 0;
 
<------>if (desc->irq_data.chip->irq_set_wake)
<------><------>ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on);
 
<------>return ret;
}
 
/**
 *	irq_set_irq_wake - control irq power management wakeup
 *	@irq:	interrupt to control
 *	@on:	enable/disable power management wakeup
 *
 *	Enable/disable power management wakeup mode, which is
 *	disabled by default.  Enables and disables must match,
 *	just as they match for non-wakeup mode support.
 *
 *	Wakeup mode lets this IRQ wake the system from sleep
 *	states like "suspend to RAM".
 *
 *	Note: irq enable/disable state is completely orthogonal
 *	to the enable/disable state of irq wake. An irq can be
 *	disabled with disable_irq() and still wake the system as
 *	long as the irq has wake enabled. If this does not hold,
 *	then the underlying irq chip and the related driver need
 *	to be investigated.
 */
int irq_set_irq_wake(unsigned int irq, unsigned int on)
{
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
<------>int ret = 0;
 
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>/* Don't use NMIs as wake up interrupts please */
<------>if (desc->istate & IRQS_NMI) {
<------><------>ret = -EINVAL;
<------><------>goto out_unlock;
<------>}
 
<------>/* wakeup-capable irqs can be shared between drivers that
<------> * don't need to have the same sleep mode behaviors.
<------> */
<------>if (on) {
<------><------>if (desc->wake_depth++ == 0) {
<------><------><------>ret = set_irq_wake_real(irq, on);
<------><------><------>if (ret)
<------><------><------><------>desc->wake_depth = 0;
<------><------><------>else
<------><------><------><------>irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE);
<------><------>}
<------>} else {
<------><------>if (desc->wake_depth == 0) {
<------><------><------>WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
<------><------>} else if (--desc->wake_depth == 0) {
<------><------><------>ret = set_irq_wake_real(irq, on);
<------><------><------>if (ret)
<------><------><------><------>desc->wake_depth = 1;
<------><------><------>else
<------><------><------><------>irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE);
<------><------>}
<------>}
 
out_unlock:
<------>irq_put_desc_busunlock(desc, flags);
<------>return ret;
}
EXPORT_SYMBOL(irq_set_irq_wake);
 
/*
 * Internal function that tells the architecture code whether a
 * particular irq has been exclusively allocated or is available
 * for driver use.
 */
int can_request_irq(unsigned int irq, unsigned long irqflags)
{
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
<------>int canrequest = 0;
 
<------>if (!desc)
<------><------>return 0;
 
<------>if (irq_settings_can_request(desc)) {
<------><------>if (!desc->action ||
<------><------>    irqflags & desc->action->flags & IRQF_SHARED)
<------><------><------>canrequest = 1;
<------>}
<------>irq_put_desc_unlock(desc, flags);
<------>return canrequest;
}
 
int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
{
<------>struct irq_chip *chip = desc->irq_data.chip;
<------>int ret, unmask = 0;
 
<------>if (!chip || !chip->irq_set_type) {
<------><------>/*
<------><------> * IRQF_TRIGGER_* but the PIC does not support multiple
<------><------> * flow-types?
<------><------> */
<------><------>pr_debug("No set_type function for IRQ %d (%s)\n",
<------><------><------> irq_desc_get_irq(desc),
<------><------><------> chip ? (chip->name ? : "unknown") : "unknown");
<------><------>return 0;
<------>}
 
<------>if (chip->flags & IRQCHIP_SET_TYPE_MASKED) {
<------><------>if (!irqd_irq_masked(&desc->irq_data))
<------><------><------>mask_irq(desc);
<------><------>if (!irqd_irq_disabled(&desc->irq_data))
<------><------><------>unmask = 1;
<------>}
 
<------>/* Mask all flags except trigger mode */
<------>flags &= IRQ_TYPE_SENSE_MASK;
<------>ret = chip->irq_set_type(&desc->irq_data, flags);
 
<------>switch (ret) {
<------>case IRQ_SET_MASK_OK:
<------>case IRQ_SET_MASK_OK_DONE:
<------><------>irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
<------><------>irqd_set(&desc->irq_data, flags);
<------><------>fallthrough;
 
<------>case IRQ_SET_MASK_OK_NOCOPY:
<------><------>flags = irqd_get_trigger_type(&desc->irq_data);
<------><------>irq_settings_set_trigger_mask(desc, flags);
<------><------>irqd_clear(&desc->irq_data, IRQD_LEVEL);
<------><------>irq_settings_clr_level(desc);
<------><------>if (flags & IRQ_TYPE_LEVEL_MASK) {
<------><------><------>irq_settings_set_level(desc);
<------><------><------>irqd_set(&desc->irq_data, IRQD_LEVEL);
<------><------>}
 
<------><------>ret = 0;
<------><------>break;
<------>default:
<------><------>pr_err("Setting trigger mode %lu for irq %u failed (%pS)\n",
<------><------>       flags, irq_desc_get_irq(desc), chip->irq_set_type);
<------>}
<------>if (unmask)
<------><------>unmask_irq(desc);
<------>return ret;
}
 
#ifdef CONFIG_HARDIRQS_SW_RESEND
int irq_set_parent(int irq, int parent_irq)
{
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
 
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>desc->parent_irq = parent_irq;
 
<------>irq_put_desc_unlock(desc, flags);
<------>return 0;
}
EXPORT_SYMBOL_GPL(irq_set_parent);
#endif
 
/*
 * Default primary interrupt handler for threaded interrupts. Is
 * assigned as primary handler when request_threaded_irq is called
 * with handler == NULL. Useful for oneshot interrupts.
 */
static irqreturn_t irq_default_primary_handler(int irq, void *dev_id)
{
<------>return IRQ_WAKE_THREAD;
}
 
/*
 * Primary handler for nested threaded interrupts. Should never be
 * called.
 */
static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id)
{
<------>WARN(1, "Primary handler called for nested irq %d\n", irq);
<------>return IRQ_NONE;
}
 
static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id)
{
<------>WARN(1, "Secondary action handler called for irq %d\n", irq);
<------>return IRQ_NONE;
}
 
static int irq_wait_for_interrupt(struct irqaction *action)
{
<------>for (;;) {
<------><------>set_current_state(TASK_INTERRUPTIBLE);
 
<------><------>if (kthread_should_stop()) {
<------><------><------>/* may need to run one last time */
<------><------><------>if (test_and_clear_bit(IRQTF_RUNTHREAD,
<------><------><------><------><------>       &action->thread_flags)) {
<------><------><------><------>__set_current_state(TASK_RUNNING);
<------><------><------><------>return 0;
<------><------><------>}
<------><------><------>__set_current_state(TASK_RUNNING);
<------><------><------>return -1;
<------><------>}
 
<------><------>if (test_and_clear_bit(IRQTF_RUNTHREAD,
<------><------><------><------>       &action->thread_flags)) {
<------><------><------>__set_current_state(TASK_RUNNING);
<------><------><------>return 0;
<------><------>}
<------><------>schedule();
<------>}
}
 
/*
 * Oneshot interrupts keep the irq line masked until the threaded
 * handler finished. unmask if the interrupt has not been disabled and
 * is marked MASKED.
 */
static void irq_finalize_oneshot(struct irq_desc *desc,
<------><------><------><------> struct irqaction *action)
{
<------>if (!(desc->istate & IRQS_ONESHOT) ||
<------>    action->handler == irq_forced_secondary_handler)
<------><------>return;
again:
<------>chip_bus_lock(desc);
<------>raw_spin_lock_irq(&desc->lock);
 
<------>/*
<------> * Implausible though it may be we need to protect us against
<------> * the following scenario:
<------> *
<------> * The thread is faster done than the hard interrupt handler
<------> * on the other CPU. If we unmask the irq line then the
<------> * interrupt can come in again and masks the line, leaves due
<------> * to IRQS_INPROGRESS and the irq line is masked forever.
<------> *
<------> * This also serializes the state of shared oneshot handlers
<------> * versus "desc->threads_onehsot |= action->thread_mask;" in
<------> * irq_wake_thread(). See the comment there which explains the
<------> * serialization.
<------> */
<------>if (unlikely(irqd_irq_inprogress(&desc->irq_data))) {
<------><------>raw_spin_unlock_irq(&desc->lock);
<------><------>chip_bus_sync_unlock(desc);
<------><------>cpu_relax();
<------><------>goto again;
<------>}
 
<------>/*
<------> * Now check again, whether the thread should run. Otherwise
<------> * we would clear the threads_oneshot bit of this thread which
<------> * was just set.
<------> */
<------>if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags))
<------><------>goto out_unlock;
 
<------>desc->threads_oneshot &= ~action->thread_mask;
 
<------>if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) &&
<------>    irqd_irq_masked(&desc->irq_data))
<------><------>unmask_threaded_irq(desc);
 
out_unlock:
<------>raw_spin_unlock_irq(&desc->lock);
<------>chip_bus_sync_unlock(desc);
}
 
#ifdef CONFIG_SMP
/*
 * Check whether we need to change the affinity of the interrupt thread.
 */
static void
irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
{
<------>cpumask_var_t mask;
<------>bool valid = true;
 
<------>if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags))
<------><------>return;
 
<------>/*
<------> * In case we are out of memory we set IRQTF_AFFINITY again and
<------> * try again next time
<------> */
<------>if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
<------><------>set_bit(IRQTF_AFFINITY, &action->thread_flags);
<------><------>return;
<------>}
 
<------>raw_spin_lock_irq(&desc->lock);
<------>/*
<------> * This code is triggered unconditionally. Check the affinity
<------> * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
<------> */
<------>if (cpumask_available(desc->irq_common_data.affinity)) {
<------><------>const struct cpumask *m;
 
<------><------>m = irq_data_get_effective_affinity_mask(&desc->irq_data);
<------><------>cpumask_copy(mask, m);
<------>} else {
<------><------>valid = false;
<------>}
<------>raw_spin_unlock_irq(&desc->lock);
 
<------>if (valid)
<------><------>set_cpus_allowed_ptr(current, mask);
<------>free_cpumask_var(mask);
}
#else
static inline void
irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
#endif
 
/*
 * Interrupts which are not explicitly requested as threaded
 * interrupts rely on the implicit bh/preempt disable of the hard irq
 * context. So we need to disable bh here to avoid deadlocks and other
 * side effects.
 */
static irqreturn_t
irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
{
<------>irqreturn_t ret;
 
<------>local_bh_disable();
<------>if (!IS_ENABLED(CONFIG_PREEMPT_RT))
<------><------>local_irq_disable();
<------>ret = action->thread_fn(action->irq, action->dev_id);
<------>if (ret == IRQ_HANDLED)
<------><------>atomic_inc(&desc->threads_handled);
 
<------>irq_finalize_oneshot(desc, action);
<------>if (!IS_ENABLED(CONFIG_PREEMPT_RT))
<------><------>local_irq_enable();
<------>local_bh_enable();
<------>return ret;
}
 
/*
 * Interrupts explicitly requested as threaded interrupts want to be
 * preemtible - many of them need to sleep and wait for slow busses to
 * complete.
 */
static irqreturn_t irq_thread_fn(struct irq_desc *desc,
<------><------>struct irqaction *action)
{
<------>irqreturn_t ret;
 
<------>ret = action->thread_fn(action->irq, action->dev_id);
<------>if (ret == IRQ_HANDLED)
<------><------>atomic_inc(&desc->threads_handled);
 
<------>irq_finalize_oneshot(desc, action);
<------>return ret;
}
 
static void wake_threads_waitq(struct irq_desc *desc)
{
<------>if (atomic_dec_and_test(&desc->threads_active))
<------><------>wake_up(&desc->wait_for_threads);
}
 
static void irq_thread_dtor(struct callback_head *unused)
{
<------>struct task_struct *tsk = current;
<------>struct irq_desc *desc;
<------>struct irqaction *action;
 
<------>if (WARN_ON_ONCE(!(current->flags & PF_EXITING)))
<------><------>return;
 
<------>action = kthread_data(tsk);
 
<------>pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n",
<------>       tsk->comm, tsk->pid, action->irq);
 
 
<------>desc = irq_to_desc(action->irq);
<------>/*
<------> * If IRQTF_RUNTHREAD is set, we need to decrement
<------> * desc->threads_active and wake possible waiters.
<------> */
<------>if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags))
<------><------>wake_threads_waitq(desc);
 
<------>/* Prevent a stale desc->threads_oneshot */
<------>irq_finalize_oneshot(desc, action);
}
 
static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action)
{
<------>struct irqaction *secondary = action->secondary;
 
<------>if (WARN_ON_ONCE(!secondary))
<------><------>return;
 
<------>raw_spin_lock_irq(&desc->lock);
<------>__irq_wake_thread(desc, secondary);
<------>raw_spin_unlock_irq(&desc->lock);
}
 
/*
 * Interrupt handler thread
 */
static int irq_thread(void *data)
{
<------>struct callback_head on_exit_work;
<------>struct irqaction *action = data;
<------>struct irq_desc *desc = irq_to_desc(action->irq);
<------>irqreturn_t (*handler_fn)(struct irq_desc *desc,
<------><------><------>struct irqaction *action);
 
<------>if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD,
<------><------><------><------><------>&action->thread_flags))
<------><------>handler_fn = irq_forced_thread_fn;
<------>else
<------><------>handler_fn = irq_thread_fn;
 
<------>init_task_work(&on_exit_work, irq_thread_dtor);
<------>task_work_add(current, &on_exit_work, TWA_NONE);
 
<------>irq_thread_check_affinity(desc, action);
 
<------>while (!irq_wait_for_interrupt(action)) {
<------><------>irqreturn_t action_ret;
 
<------><------>irq_thread_check_affinity(desc, action);
 
<------><------>action_ret = handler_fn(desc, action);
<------><------>if (action_ret == IRQ_WAKE_THREAD)
<------><------><------>irq_wake_secondary(desc, action);
 
<------><------>wake_threads_waitq(desc);
<------>}
 
<------>/*
<------> * This is the regular exit path. __free_irq() is stopping the
<------> * thread via kthread_stop() after calling
<------> * synchronize_hardirq(). So neither IRQTF_RUNTHREAD nor the
<------> * oneshot mask bit can be set.
<------> */
<------>task_work_cancel(current, irq_thread_dtor);
<------>return 0;
}
 
/**
 *	irq_wake_thread - wake the irq thread for the action identified by dev_id
 *	@irq:		Interrupt line
 *	@dev_id:	Device identity for which the thread should be woken
 *
 */
void irq_wake_thread(unsigned int irq, void *dev_id)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>struct irqaction *action;
<------>unsigned long flags;
 
<------>if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
<------><------>return;
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
<------>for_each_action_of_desc(desc, action) {
<------><------>if (action->dev_id == dev_id) {
<------><------><------>if (action->thread)
<------><------><------><------>__irq_wake_thread(desc, action);
<------><------><------>break;
<------><------>}
<------>}
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
}
EXPORT_SYMBOL_GPL(irq_wake_thread);
 
static int irq_setup_forced_threading(struct irqaction *new)
{
<------>if (!force_irqthreads)
<------><------>return 0;
<------>if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT))
<------><------>return 0;
 
<------>/*
<------> * No further action required for interrupts which are requested as
<------> * threaded interrupts already
<------> */
<------>if (new->handler == irq_default_primary_handler)
<------><------>return 0;
 
<------>new->flags |= IRQF_ONESHOT;
 
<------>/*
<------> * Handle the case where we have a real primary handler and a
<------> * thread handler. We force thread them as well by creating a
<------> * secondary action.
<------> */
<------>if (new->handler && new->thread_fn) {
<------><------>/* Allocate the secondary action */
<------><------>new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
<------><------>if (!new->secondary)
<------><------><------>return -ENOMEM;
<------><------>new->secondary->handler = irq_forced_secondary_handler;
<------><------>new->secondary->thread_fn = new->thread_fn;
<------><------>new->secondary->dev_id = new->dev_id;
<------><------>new->secondary->irq = new->irq;
<------><------>new->secondary->name = new->name;
<------>}
<------>/* Deal with the primary handler */
<------>set_bit(IRQTF_FORCED_THREAD, &new->thread_flags);
<------>new->thread_fn = new->handler;
<------>new->handler = irq_default_primary_handler;
<------>return 0;
}
 
static int irq_request_resources(struct irq_desc *desc)
{
<------>struct irq_data *d = &desc->irq_data;
<------>struct irq_chip *c = d->chip;
 
<------>return c->irq_request_resources ? c->irq_request_resources(d) : 0;
}
 
static void irq_release_resources(struct irq_desc *desc)
{
<------>struct irq_data *d = &desc->irq_data;
<------>struct irq_chip *c = d->chip;
 
<------>if (c->irq_release_resources)
<------><------>c->irq_release_resources(d);
}
 
static bool irq_supports_nmi(struct irq_desc *desc)
{
<------>struct irq_data *d = irq_desc_get_irq_data(desc);
 
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
<------>/* Only IRQs directly managed by the root irqchip can be set as NMI */
<------>if (d->parent_data)
<------><------>return false;
#endif
<------>/* Don't support NMIs for chips behind a slow bus */
<------>if (d->chip->irq_bus_lock || d->chip->irq_bus_sync_unlock)
<------><------>return false;
 
<------>return d->chip->flags & IRQCHIP_SUPPORTS_NMI;
}
 
static int irq_nmi_setup(struct irq_desc *desc)
{
<------>struct irq_data *d = irq_desc_get_irq_data(desc);
<------>struct irq_chip *c = d->chip;
 
<------>return c->irq_nmi_setup ? c->irq_nmi_setup(d) : -EINVAL;
}
 
static void irq_nmi_teardown(struct irq_desc *desc)
{
<------>struct irq_data *d = irq_desc_get_irq_data(desc);
<------>struct irq_chip *c = d->chip;
 
<------>if (c->irq_nmi_teardown)
<------><------>c->irq_nmi_teardown(d);
}
 
static int
setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
{
<------>struct task_struct *t;
 
<------>if (!secondary) {
<------><------>t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
<------><------><------><------>   new->name);
<------>} else {
<------><------>t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq,
<------><------><------><------>   new->name);
<------>}
 
<------>if (IS_ERR(t))
<------><------>return PTR_ERR(t);
 
<------>sched_set_fifo(t);
 
<------>/*
<------> * We keep the reference to the task struct even if
<------> * the thread dies to avoid that the interrupt code
<------> * references an already freed task_struct.
<------> */
<------>new->thread = get_task_struct(t);
<------>/*
<------> * Tell the thread to set its affinity. This is
<------> * important for shared interrupt handlers as we do
<------> * not invoke setup_affinity() for the secondary
<------> * handlers as everything is already set up. Even for
<------> * interrupts marked with IRQF_NO_BALANCE this is
<------> * correct as we want the thread to move to the cpu(s)
<------> * on which the requesting code placed the interrupt.
<------> */
<------>set_bit(IRQTF_AFFINITY, &new->thread_flags);
<------>return 0;
}
 
/*
 * Internal function to register an irqaction - typically used to
 * allocate special interrupts that are part of the architecture.
 *
 * Locking rules:
 *
 * desc->request_mutex	Provides serialization against a concurrent free_irq()
 *   chip_bus_lock	Provides serialization for slow bus operations
 *     desc->lock	Provides serialization against hard interrupts
 *
 * chip_bus_lock and desc->lock are sufficient for all other management and
 * interrupt related functions. desc->request_mutex solely serializes
 * request/free_irq().
 */
static int
__setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
{
<------>struct irqaction *old, **old_ptr;
<------>unsigned long flags, thread_mask = 0;
<------>int ret, nested, shared = 0;
 
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>if (desc->irq_data.chip == &no_irq_chip)
<------><------>return -ENOSYS;
<------>if (!try_module_get(desc->owner))
<------><------>return -ENODEV;
 
<------>new->irq = irq;
 
<------>/*
<------> * If the trigger type is not specified by the caller,
<------> * then use the default for this interrupt.
<------> */
<------>if (!(new->flags & IRQF_TRIGGER_MASK))
<------><------>new->flags |= irqd_get_trigger_type(&desc->irq_data);
 
<------>/*
<------> * Check whether the interrupt nests into another interrupt
<------> * thread.
<------> */
<------>nested = irq_settings_is_nested_thread(desc);
<------>if (nested) {
<------><------>if (!new->thread_fn) {
<------><------><------>ret = -EINVAL;
<------><------><------>goto out_mput;
<------><------>}
<------><------>/*
<------><------> * Replace the primary handler which was provided from
<------><------> * the driver for non nested interrupt handling by the
<------><------> * dummy function which warns when called.
<------><------> */
<------><------>new->handler = irq_nested_primary_handler;
<------>} else {
<------><------>if (irq_settings_can_thread(desc)) {
<------><------><------>ret = irq_setup_forced_threading(new);
<------><------><------>if (ret)
<------><------><------><------>goto out_mput;
<------><------>}
<------>}
 
<------>/*
<------> * Create a handler thread when a thread function is supplied
<------> * and the interrupt does not nest into another interrupt
<------> * thread.
<------> */
<------>if (new->thread_fn && !nested) {
<------><------>ret = setup_irq_thread(new, irq, false);
<------><------>if (ret)
<------><------><------>goto out_mput;
<------><------>if (new->secondary) {
<------><------><------>ret = setup_irq_thread(new->secondary, irq, true);
<------><------><------>if (ret)
<------><------><------><------>goto out_thread;
<------><------>}
<------>}
 
<------>/*
<------> * Drivers are often written to work w/o knowledge about the
<------> * underlying irq chip implementation, so a request for a
<------> * threaded irq without a primary hard irq context handler
<------> * requires the ONESHOT flag to be set. Some irq chips like
<------> * MSI based interrupts are per se one shot safe. Check the
<------> * chip flags, so we can avoid the unmask dance at the end of
<------> * the threaded handler for those.
<------> */
<------>if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)
<------><------>new->flags &= ~IRQF_ONESHOT;
 
<------>/*
<------> * Protects against a concurrent __free_irq() call which might wait
<------> * for synchronize_hardirq() to complete without holding the optional
<------> * chip bus lock and desc->lock. Also protects against handing out
<------> * a recycled oneshot thread_mask bit while it's still in use by
<------> * its previous owner.
<------> */
<------>mutex_lock(&desc->request_mutex);
 
<------>/*
<------> * Acquire bus lock as the irq_request_resources() callback below
<------> * might rely on the serialization or the magic power management
<------> * functions which are abusing the irq_bus_lock() callback,
<------> */
<------>chip_bus_lock(desc);
 
<------>/* First installed action requests resources. */
<------>if (!desc->action) {
<------><------>ret = irq_request_resources(desc);
<------><------>if (ret) {
<------><------><------>pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
<------><------><------>       new->name, irq, desc->irq_data.chip->name);
<------><------><------>goto out_bus_unlock;
<------><------>}
<------>}
 
<------>/*
<------> * The following block of code has to be executed atomically
<------> * protected against a concurrent interrupt and any of the other
<------> * management calls which are not serialized via
<------> * desc->request_mutex or the optional bus lock.
<------> */
<------>raw_spin_lock_irqsave(&desc->lock, flags);
<------>old_ptr = &desc->action;
<------>old = *old_ptr;
<------>if (old) {
<------><------>/*
<------><------> * Can't share interrupts unless both agree to and are
<------><------> * the same type (level, edge, polarity). So both flag
<------><------> * fields must have IRQF_SHARED set and the bits which
<------><------> * set the trigger type must match. Also all must
<------><------> * agree on ONESHOT.
<------><------> * Interrupt lines used for NMIs cannot be shared.
<------><------> */
<------><------>unsigned int oldtype;
 
<------><------>if (desc->istate & IRQS_NMI) {
<------><------><------>pr_err("Invalid attempt to share NMI for %s (irq %d) on irqchip %s.\n",
<------><------><------><------>new->name, irq, desc->irq_data.chip->name);
<------><------><------>ret = -EINVAL;
<------><------><------>goto out_unlock;
<------><------>}
 
<------><------>/*
<------><------> * If nobody did set the configuration before, inherit
<------><------> * the one provided by the requester.
<------><------> */
<------><------>if (irqd_trigger_type_was_set(&desc->irq_data)) {
<------><------><------>oldtype = irqd_get_trigger_type(&desc->irq_data);
<------><------>} else {
<------><------><------>oldtype = new->flags & IRQF_TRIGGER_MASK;
<------><------><------>irqd_set_trigger_type(&desc->irq_data, oldtype);
<------><------>}
 
<------><------>if (!((old->flags & new->flags) & IRQF_SHARED) ||
<------><------>    (oldtype != (new->flags & IRQF_TRIGGER_MASK)) ||
<------><------>    ((old->flags ^ new->flags) & IRQF_ONESHOT))
<------><------><------>goto mismatch;
 
<------><------>/* All handlers must agree on per-cpuness */
<------><------>if ((old->flags & IRQF_PERCPU) !=
<------><------>    (new->flags & IRQF_PERCPU))
<------><------><------>goto mismatch;
 
<------><------>/* add new interrupt at end of irq queue */
<------><------>do {
<------><------><------>/*
<------><------><------> * Or all existing action->thread_mask bits,
<------><------><------> * so we can find the next zero bit for this
<------><------><------> * new action.
<------><------><------> */
<------><------><------>thread_mask |= old->thread_mask;
<------><------><------>old_ptr = &old->next;
<------><------><------>old = *old_ptr;
<------><------>} while (old);
<------><------>shared = 1;
<------>}
 
<------>/*
<------> * Setup the thread mask for this irqaction for ONESHOT. For
<------> * !ONESHOT irqs the thread mask is 0 so we can avoid a
<------> * conditional in irq_wake_thread().
<------> */
<------>if (new->flags & IRQF_ONESHOT) {
<------><------>/*
<------><------> * Unlikely to have 32 resp 64 irqs sharing one line,
<------><------> * but who knows.
<------><------> */
<------><------>if (thread_mask == ~0UL) {
<------><------><------>ret = -EBUSY;
<------><------><------>goto out_unlock;
<------><------>}
<------><------>/*
<------><------> * The thread_mask for the action is or'ed to
<------><------> * desc->thread_active to indicate that the
<------><------> * IRQF_ONESHOT thread handler has been woken, but not
<------><------> * yet finished. The bit is cleared when a thread
<------><------> * completes. When all threads of a shared interrupt
<------><------> * line have completed desc->threads_active becomes
<------><------> * zero and the interrupt line is unmasked. See
<------><------> * handle.c:irq_wake_thread() for further information.
<------><------> *
<------><------> * If no thread is woken by primary (hard irq context)
<------><------> * interrupt handlers, then desc->threads_active is
<------><------> * also checked for zero to unmask the irq line in the
<------><------> * affected hard irq flow handlers
<------><------> * (handle_[fasteoi|level]_irq).
<------><------> *
<------><------> * The new action gets the first zero bit of
<------><------> * thread_mask assigned. See the loop above which or's
<------><------> * all existing action->thread_mask bits.
<------><------> */
<------><------>new->thread_mask = 1UL << ffz(thread_mask);
 
<------>} else if (new->handler == irq_default_primary_handler &&
<------><------>   !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) {
<------><------>/*
<------><------> * The interrupt was requested with handler = NULL, so
<------><------> * we use the default primary handler for it. But it
<------><------> * does not have the oneshot flag set. In combination
<------><------> * with level interrupts this is deadly, because the
<------><------> * default primary handler just wakes the thread, then
<------><------> * the irq lines is reenabled, but the device still
<------><------> * has the level irq asserted. Rinse and repeat....
<------><------> *
<------><------> * While this works for edge type interrupts, we play
<------><------> * it safe and reject unconditionally because we can't
<------><------> * say for sure which type this interrupt really
<------><------> * has. The type flags are unreliable as the
<------><------> * underlying chip implementation can override them.
<------><------> */
<------><------>pr_err("Threaded irq requested with handler=NULL and !ONESHOT for %s (irq %d)\n",
<------><------>       new->name, irq);
<------><------>ret = -EINVAL;
<------><------>goto out_unlock;
<------>}
 
<------>if (!shared) {
<------><------>init_waitqueue_head(&desc->wait_for_threads);
 
<------><------>/* Setup the type (level, edge polarity) if configured: */
<------><------>if (new->flags & IRQF_TRIGGER_MASK) {
<------><------><------>ret = __irq_set_trigger(desc,
<------><------><------><------><------><------>new->flags & IRQF_TRIGGER_MASK);
 
<------><------><------>if (ret)
<------><------><------><------>goto out_unlock;
<------><------>}
 
<------><------>/*
<------><------> * Activate the interrupt. That activation must happen
<------><------> * independently of IRQ_NOAUTOEN. request_irq() can fail
<------><------> * and the callers are supposed to handle
<------><------> * that. enable_irq() of an interrupt requested with
<------><------> * IRQ_NOAUTOEN is not supposed to fail. The activation
<------><------> * keeps it in shutdown mode, it merily associates
<------><------> * resources if necessary and if that's not possible it
<------><------> * fails. Interrupts which are in managed shutdown mode
<------><------> * will simply ignore that activation request.
<------><------> */
<------><------>ret = irq_activate(desc);
<------><------>if (ret)
<------><------><------>goto out_unlock;
 
<------><------>desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
<------><------><------><------>  IRQS_ONESHOT | IRQS_WAITING);
<------><------>irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 
<------><------>if (new->flags & IRQF_PERCPU) {
<------><------><------>irqd_set(&desc->irq_data, IRQD_PER_CPU);
<------><------><------>irq_settings_set_per_cpu(desc);
<------><------>}
 
<------><------>if (new->flags & IRQF_ONESHOT)
<------><------><------>desc->istate |= IRQS_ONESHOT;
 
<------><------>/* Exclude IRQ from balancing if requested */
<------><------>if (new->flags & IRQF_NOBALANCING) {
<------><------><------>irq_settings_set_no_balancing(desc);
<------><------><------>irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
<------><------>}
 
<------><------>if (irq_settings_can_autoenable(desc)) {
<------><------><------>irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
<------><------>} else {
<------><------><------>/*
<------><------><------> * Shared interrupts do not go well with disabling
<------><------><------> * auto enable. The sharing interrupt might request
<------><------><------> * it while it's still disabled and then wait for
<------><------><------> * interrupts forever.
<------><------><------> */
<------><------><------>WARN_ON_ONCE(new->flags & IRQF_SHARED);
<------><------><------>/* Undo nested disables: */
<------><------><------>desc->depth = 1;
<------><------>}
 
<------>} else if (new->flags & IRQF_TRIGGER_MASK) {
<------><------>unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
<------><------>unsigned int omsk = irqd_get_trigger_type(&desc->irq_data);
 
<------><------>if (nmsk != omsk)
<------><------><------>/* hope the handler works with current  trigger mode */
<------><------><------>pr_warn("irq %d uses trigger mode %u; requested %u\n",
<------><------><------><------>irq, omsk, nmsk);
<------>}
 
<------>*old_ptr = new;
 
<------>irq_pm_install_action(desc, new);
 
<------>/* Reset broken irq detection when installing new handler */
<------>desc->irq_count = 0;
<------>desc->irqs_unhandled = 0;
 
<------>/*
<------> * Check whether we disabled the irq via the spurious handler
<------> * before. Reenable it and give it another chance.
<------> */
<------>if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) {
<------><------>desc->istate &= ~IRQS_SPURIOUS_DISABLED;
<------><------>__enable_irq(desc);
<------>}
 
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
<------>chip_bus_sync_unlock(desc);
<------>mutex_unlock(&desc->request_mutex);
 
<------>irq_setup_timings(desc, new);
 
<------>/*
<------> * Strictly no need to wake it up, but hung_task complains
<------> * when no hard interrupt wakes the thread up.
<------> */
<------>if (new->thread)
<------><------>wake_up_process(new->thread);
<------>if (new->secondary)
<------><------>wake_up_process(new->secondary->thread);
 
<------>register_irq_proc(irq, desc);
<------>new->dir = NULL;
<------>register_handler_proc(irq, new);
<------>return 0;
 
mismatch:
<------>if (!(new->flags & IRQF_PROBE_SHARED)) {
<------><------>pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n",
<------><------>       irq, new->flags, new->name, old->flags, old->name);
#ifdef CONFIG_DEBUG_SHIRQ
<------><------>dump_stack();
#endif
<------>}
<------>ret = -EBUSY;
 
out_unlock:
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------>if (!desc->action)
<------><------>irq_release_resources(desc);
out_bus_unlock:
<------>chip_bus_sync_unlock(desc);
<------>mutex_unlock(&desc->request_mutex);
 
out_thread:
<------>if (new->thread) {
<------><------>struct task_struct *t = new->thread;
 
<------><------>new->thread = NULL;
<------><------>kthread_stop(t);
<------><------>put_task_struct(t);
<------>}
<------>if (new->secondary && new->secondary->thread) {
<------><------>struct task_struct *t = new->secondary->thread;
 
<------><------>new->secondary->thread = NULL;
<------><------>kthread_stop(t);
<------><------>put_task_struct(t);
<------>}
out_mput:
<------>module_put(desc->owner);
<------>return ret;
}
 
/*
 * Internal function to unregister an irqaction - used to free
 * regular and special interrupts that are part of the architecture.
 */
static struct irqaction *__free_irq(struct irq_desc *desc, void *dev_id)
{
<------>unsigned irq = desc->irq_data.irq;
<------>struct irqaction *action, **action_ptr;
<------>unsigned long flags;
 
<------>WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
 
<------>mutex_lock(&desc->request_mutex);
<------>chip_bus_lock(desc);
<------>raw_spin_lock_irqsave(&desc->lock, flags);
 
<------>/*
<------> * There can be multiple actions per IRQ descriptor, find the right
<------> * one based on the dev_id:
<------> */
<------>action_ptr = &desc->action;
<------>for (;;) {
<------><------>action = *action_ptr;
 
<------><------>if (!action) {
<------><------><------>WARN(1, "Trying to free already-free IRQ %d\n", irq);
<------><------><------>raw_spin_unlock_irqrestore(&desc->lock, flags);
<------><------><------>chip_bus_sync_unlock(desc);
<------><------><------>mutex_unlock(&desc->request_mutex);
<------><------><------>return NULL;
<------><------>}
 
<------><------>if (action->dev_id == dev_id)
<------><------><------>break;
<------><------>action_ptr = &action->next;
<------>}
 
<------>/* Found it - now remove it from the list of entries: */
<------>*action_ptr = action->next;
 
<------>irq_pm_remove_action(desc, action);
 
<------>/* If this was the last handler, shut down the IRQ line: */
<------>if (!desc->action) {
<------><------>irq_settings_clr_disable_unlazy(desc);
<------><------>/* Only shutdown. Deactivate after synchronize_hardirq() */
<------><------>irq_shutdown(desc);
<------>}
 
#ifdef CONFIG_SMP
<------>/* make sure affinity_hint is cleaned up */
<------>if (WARN_ON_ONCE(desc->affinity_hint))
<------><------>desc->affinity_hint = NULL;
#endif
 
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
<------>/*
<------> * Drop bus_lock here so the changes which were done in the chip
<------> * callbacks above are synced out to the irq chips which hang
<------> * behind a slow bus (I2C, SPI) before calling synchronize_hardirq().
<------> *
<------> * Aside of that the bus_lock can also be taken from the threaded
<------> * handler in irq_finalize_oneshot() which results in a deadlock
<------> * because kthread_stop() would wait forever for the thread to
<------> * complete, which is blocked on the bus lock.
<------> *
<------> * The still held desc->request_mutex() protects against a
<------> * concurrent request_irq() of this irq so the release of resources
<------> * and timing data is properly serialized.
<------> */
<------>chip_bus_sync_unlock(desc);
 
<------>unregister_handler_proc(irq, action);
 
<------>/*
<------> * Make sure it's not being used on another CPU and if the chip
<------> * supports it also make sure that there is no (not yet serviced)
<------> * interrupt in flight at the hardware level.
<------> */
<------>__synchronize_hardirq(desc, true);
 
#ifdef CONFIG_DEBUG_SHIRQ
<------>/*
<------> * It's a shared IRQ -- the driver ought to be prepared for an IRQ
<------> * event to happen even now it's being freed, so let's make sure that
<------> * is so by doing an extra call to the handler ....
<------> *
<------> * ( We do this after actually deregistering it, to make sure that a
<------> *   'real' IRQ doesn't run in parallel with our fake. )
<------> */
<------>if (action->flags & IRQF_SHARED) {
<------><------>local_irq_save(flags);
<------><------>action->handler(irq, dev_id);
<------><------>local_irq_restore(flags);
<------>}
#endif
 
<------>/*
<------> * The action has already been removed above, but the thread writes
<------> * its oneshot mask bit when it completes. Though request_mutex is
<------> * held across this which prevents __setup_irq() from handing out
<------> * the same bit to a newly requested action.
<------> */
<------>if (action->thread) {
<------><------>kthread_stop(action->thread);
<------><------>put_task_struct(action->thread);
<------><------>if (action->secondary && action->secondary->thread) {
<------><------><------>kthread_stop(action->secondary->thread);
<------><------><------>put_task_struct(action->secondary->thread);
<------><------>}
<------>}
 
<------>/* Last action releases resources */
<------>if (!desc->action) {
<------><------>/*
<------><------> * Reaquire bus lock as irq_release_resources() might
<------><------> * require it to deallocate resources over the slow bus.
<------><------> */
<------><------>chip_bus_lock(desc);
<------><------>/*
<------><------> * There is no interrupt on the fly anymore. Deactivate it
<------><------> * completely.
<------><------> */
<------><------>raw_spin_lock_irqsave(&desc->lock, flags);
<------><------>irq_domain_deactivate_irq(&desc->irq_data);
<------><------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------><------>irq_release_resources(desc);
<------><------>chip_bus_sync_unlock(desc);
<------><------>irq_remove_timings(desc);
<------>}
 
<------>mutex_unlock(&desc->request_mutex);
 
<------>irq_chip_pm_put(&desc->irq_data);
<------>module_put(desc->owner);
<------>kfree(action->secondary);
<------>return action;
}
 
/**
 *	free_irq - free an interrupt allocated with request_irq
 *	@irq: Interrupt line to free
 *	@dev_id: Device identity to free
 *
 *	Remove an interrupt handler. The handler is removed and if the
 *	interrupt line is no longer in use by any driver it is disabled.
 *	On a shared IRQ the caller must ensure the interrupt is disabled
 *	on the card it drives before calling this function. The function
 *	does not return until any executing interrupts for this IRQ
 *	have completed.
 *
 *	This function must not be called from interrupt context.
 *
 *	Returns the devname argument passed to request_irq.
 */
const void *free_irq(unsigned int irq, void *dev_id)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>struct irqaction *action;
<------>const char *devname;
 
<------>if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
<------><------>return NULL;
 
#ifdef CONFIG_SMP
<------>if (WARN_ON(desc->affinity_notify))
<------><------>desc->affinity_notify = NULL;
#endif
 
<------>action = __free_irq(desc, dev_id);
 
<------>if (!action)
<------><------>return NULL;
 
<------>devname = action->name;
<------>kfree(action);
<------>return devname;
}
EXPORT_SYMBOL(free_irq);
 
/* This function must be called with desc->lock held */
static const void *__cleanup_nmi(unsigned int irq, struct irq_desc *desc)
{
<------>const char *devname = NULL;
 
<------>desc->istate &= ~IRQS_NMI;
 
<------>if (!WARN_ON(desc->action == NULL)) {
<------><------>irq_pm_remove_action(desc, desc->action);
<------><------>devname = desc->action->name;
<------><------>unregister_handler_proc(irq, desc->action);
 
<------><------>kfree(desc->action);
<------><------>desc->action = NULL;
<------>}
 
<------>irq_settings_clr_disable_unlazy(desc);
<------>irq_shutdown_and_deactivate(desc);
 
<------>irq_release_resources(desc);
 
<------>irq_chip_pm_put(&desc->irq_data);
<------>module_put(desc->owner);
 
<------>return devname;
}
 
const void *free_nmi(unsigned int irq, void *dev_id)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>unsigned long flags;
<------>const void *devname;
 
<------>if (!desc || WARN_ON(!(desc->istate & IRQS_NMI)))
<------><------>return NULL;
 
<------>if (WARN_ON(irq_settings_is_per_cpu_devid(desc)))
<------><------>return NULL;
 
<------>/* NMI still enabled */
<------>if (WARN_ON(desc->depth == 0))
<------><------>disable_nmi_nosync(irq);
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
 
<------>irq_nmi_teardown(desc);
<------>devname = __cleanup_nmi(irq, desc);
 
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------>return devname;
}
 
/**
 *	request_threaded_irq - allocate an interrupt line
 *	@irq: Interrupt line to allocate
 *	@handler: Function to be called when the IRQ occurs.
 *		  Primary handler for threaded interrupts
 *		  If NULL and thread_fn != NULL the default
 *		  primary handler is installed
 *	@thread_fn: Function called from the irq handler thread
 *		    If NULL, no irq thread is created
 *	@irqflags: Interrupt type flags
 *	@devname: An ascii name for the claiming device
 *	@dev_id: A cookie passed back to the handler function
 *
 *	This call allocates interrupt resources and enables the
 *	interrupt line and IRQ handling. From the point this
 *	call is made your handler function may be invoked. Since
 *	your handler function must clear any interrupt the board
 *	raises, you must take care both to initialise your hardware
 *	and to set up the interrupt handler in the right order.
 *
 *	If you want to set up a threaded irq handler for your device
 *	then you need to supply @handler and @thread_fn. @handler is
 *	still called in hard interrupt context and has to check
 *	whether the interrupt originates from the device. If yes it
 *	needs to disable the interrupt on the device and return
 *	IRQ_WAKE_THREAD which will wake up the handler thread and run
 *	@thread_fn. This split handler design is necessary to support
 *	shared interrupts.
 *
 *	Dev_id must be globally unique. Normally the address of the
 *	device data structure is used as the cookie. Since the handler
 *	receives this value it makes sense to use it.
 *
 *	If your interrupt is shared you must pass a non NULL dev_id
 *	as this is required when freeing the interrupt.
 *
 *	Flags:
 *
 *	IRQF_SHARED		Interrupt is shared
 *	IRQF_TRIGGER_*		Specify active edge(s) or level
 *
 */
int request_threaded_irq(unsigned int irq, irq_handler_t handler,
<------><------><------> irq_handler_t thread_fn, unsigned long irqflags,
<------><------><------> const char *devname, void *dev_id)
{
<------>struct irqaction *action;
<------>struct irq_desc *desc;
<------>int retval;
 
<------>if (irq == IRQ_NOTCONNECTED)
<------><------>return -ENOTCONN;
 
<------>/*
<------> * Sanity-check: shared interrupts must pass in a real dev-ID,
<------> * otherwise we'll have trouble later trying to figure out
<------> * which interrupt is which (messes up the interrupt freeing
<------> * logic etc).
<------> *
<------> * Also IRQF_COND_SUSPEND only makes sense for shared interrupts and
<------> * it cannot be set along with IRQF_NO_SUSPEND.
<------> */
<------>if (((irqflags & IRQF_SHARED) && !dev_id) ||
<------>    (!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) ||
<------>    ((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND)))
<------><------>return -EINVAL;
 
<------>desc = irq_to_desc(irq);
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>if (!irq_settings_can_request(desc) ||
<------>    WARN_ON(irq_settings_is_per_cpu_devid(desc)))
<------><------>return -EINVAL;
 
<------>if (!handler) {
<------><------>if (!thread_fn)
<------><------><------>return -EINVAL;
<------><------>handler = irq_default_primary_handler;
<------>}
 
<------>action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
<------>if (!action)
<------><------>return -ENOMEM;
 
<------>action->handler = handler;
<------>action->thread_fn = thread_fn;
<------>action->flags = irqflags;
<------>action->name = devname;
<------>action->dev_id = dev_id;
 
<------>retval = irq_chip_pm_get(&desc->irq_data);
<------>if (retval < 0) {
<------><------>kfree(action);
<------><------>return retval;
<------>}
 
<------>retval = __setup_irq(irq, desc, action);
 
<------>if (retval) {
<------><------>irq_chip_pm_put(&desc->irq_data);
<------><------>kfree(action->secondary);
<------><------>kfree(action);
<------>}
 
#ifdef CONFIG_DEBUG_SHIRQ_FIXME
<------>if (!retval && (irqflags & IRQF_SHARED)) {
<------><------>/*
<------><------> * It's a shared IRQ -- the driver ought to be prepared for it
<------><------> * to happen immediately, so let's make sure....
<------><------> * We disable the irq to make sure that a 'real' IRQ doesn't
<------><------> * run in parallel with our fake.
<------><------> */
<------><------>unsigned long flags;
 
<------><------>disable_irq(irq);
<------><------>local_irq_save(flags);
 
<------><------>handler(irq, dev_id);
 
<------><------>local_irq_restore(flags);
<------><------>enable_irq(irq);
<------>}
#endif
<------>return retval;
}
EXPORT_SYMBOL(request_threaded_irq);
 
/**
 *	request_any_context_irq - allocate an interrupt line
 *	@irq: Interrupt line to allocate
 *	@handler: Function to be called when the IRQ occurs.
 *		  Threaded handler for threaded interrupts.
 *	@flags: Interrupt type flags
 *	@name: An ascii name for the claiming device
 *	@dev_id: A cookie passed back to the handler function
 *
 *	This call allocates interrupt resources and enables the
 *	interrupt line and IRQ handling. It selects either a
 *	hardirq or threaded handling method depending on the
 *	context.
 *
 *	On failure, it returns a negative value. On success,
 *	it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
 */
int request_any_context_irq(unsigned int irq, irq_handler_t handler,
<------><------><------>    unsigned long flags, const char *name, void *dev_id)
{
<------>struct irq_desc *desc;
<------>int ret;
 
<------>if (irq == IRQ_NOTCONNECTED)
<------><------>return -ENOTCONN;
 
<------>desc = irq_to_desc(irq);
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>if (irq_settings_is_nested_thread(desc)) {
<------><------>ret = request_threaded_irq(irq, NULL, handler,
<------><------><------><------><------>   flags, name, dev_id);
<------><------>return !ret ? IRQC_IS_NESTED : ret;
<------>}
 
<------>ret = request_irq(irq, handler, flags, name, dev_id);
<------>return !ret ? IRQC_IS_HARDIRQ : ret;
}
EXPORT_SYMBOL_GPL(request_any_context_irq);
 
/**
 *	request_nmi - allocate an interrupt line for NMI delivery
 *	@irq: Interrupt line to allocate
 *	@handler: Function to be called when the IRQ occurs.
 *		  Threaded handler for threaded interrupts.
 *	@irqflags: Interrupt type flags
 *	@name: An ascii name for the claiming device
 *	@dev_id: A cookie passed back to the handler function
 *
 *	This call allocates interrupt resources and enables the
 *	interrupt line and IRQ handling. It sets up the IRQ line
 *	to be handled as an NMI.
 *
 *	An interrupt line delivering NMIs cannot be shared and IRQ handling
 *	cannot be threaded.
 *
 *	Interrupt lines requested for NMI delivering must produce per cpu
 *	interrupts and have auto enabling setting disabled.
 *
 *	Dev_id must be globally unique. Normally the address of the
 *	device data structure is used as the cookie. Since the handler
 *	receives this value it makes sense to use it.
 *
 *	If the interrupt line cannot be used to deliver NMIs, function
 *	will fail and return a negative value.
 */
int request_nmi(unsigned int irq, irq_handler_t handler,
<------><------>unsigned long irqflags, const char *name, void *dev_id)
{
<------>struct irqaction *action;
<------>struct irq_desc *desc;
<------>unsigned long flags;
<------>int retval;
 
<------>if (irq == IRQ_NOTCONNECTED)
<------><------>return -ENOTCONN;
 
<------>/* NMI cannot be shared, used for Polling */
<------>if (irqflags & (IRQF_SHARED | IRQF_COND_SUSPEND | IRQF_IRQPOLL))
<------><------>return -EINVAL;
 
<------>if (!(irqflags & IRQF_PERCPU))
<------><------>return -EINVAL;
 
<------>if (!handler)
<------><------>return -EINVAL;
 
<------>desc = irq_to_desc(irq);
 
<------>if (!desc || irq_settings_can_autoenable(desc) ||
<------>    !irq_settings_can_request(desc) ||
<------>    WARN_ON(irq_settings_is_per_cpu_devid(desc)) ||
<------>    !irq_supports_nmi(desc))
<------><------>return -EINVAL;
 
<------>action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
<------>if (!action)
<------><------>return -ENOMEM;
 
<------>action->handler = handler;
<------>action->flags = irqflags | IRQF_NO_THREAD | IRQF_NOBALANCING;
<------>action->name = name;
<------>action->dev_id = dev_id;
 
<------>retval = irq_chip_pm_get(&desc->irq_data);
<------>if (retval < 0)
<------><------>goto err_out;
 
<------>retval = __setup_irq(irq, desc, action);
<------>if (retval)
<------><------>goto err_irq_setup;
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
 
<------>/* Setup NMI state */
<------>desc->istate |= IRQS_NMI;
<------>retval = irq_nmi_setup(desc);
<------>if (retval) {
<------><------>__cleanup_nmi(irq, desc);
<------><------>raw_spin_unlock_irqrestore(&desc->lock, flags);
<------><------>return -EINVAL;
<------>}
 
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------>return 0;
 
err_irq_setup:
<------>irq_chip_pm_put(&desc->irq_data);
err_out:
<------>kfree(action);
 
<------>return retval;
}
 
void enable_percpu_irq(unsigned int irq, unsigned int type)
{
<------>unsigned int cpu = smp_processor_id();
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
 
<------>if (!desc)
<------><------>return;
 
<------>/*
<------> * If the trigger type is not specified by the caller, then
<------> * use the default for this interrupt.
<------> */
<------>type &= IRQ_TYPE_SENSE_MASK;
<------>if (type == IRQ_TYPE_NONE)
<------><------>type = irqd_get_trigger_type(&desc->irq_data);
 
<------>if (type != IRQ_TYPE_NONE) {
<------><------>int ret;
 
<------><------>ret = __irq_set_trigger(desc, type);
 
<------><------>if (ret) {
<------><------><------>WARN(1, "failed to set type for IRQ%d\n", irq);
<------><------><------>goto out;
<------><------>}
<------>}
 
<------>irq_percpu_enable(desc, cpu);
out:
<------>irq_put_desc_unlock(desc, flags);
}
EXPORT_SYMBOL_GPL(enable_percpu_irq);
 
void enable_percpu_nmi(unsigned int irq, unsigned int type)
{
<------>enable_percpu_irq(irq, type);
}
 
/**
 * irq_percpu_is_enabled - Check whether the per cpu irq is enabled
 * @irq:	Linux irq number to check for
 *
 * Must be called from a non migratable context. Returns the enable
 * state of a per cpu interrupt on the current cpu.
 */
bool irq_percpu_is_enabled(unsigned int irq)
{
<------>unsigned int cpu = smp_processor_id();
<------>struct irq_desc *desc;
<------>unsigned long flags;
<------>bool is_enabled;
 
<------>desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
<------>if (!desc)
<------><------>return false;
 
<------>is_enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
<------>irq_put_desc_unlock(desc, flags);
 
<------>return is_enabled;
}
EXPORT_SYMBOL_GPL(irq_percpu_is_enabled);
 
void disable_percpu_irq(unsigned int irq)
{
<------>unsigned int cpu = smp_processor_id();
<------>unsigned long flags;
<------>struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
 
<------>if (!desc)
<------><------>return;
 
<------>irq_percpu_disable(desc, cpu);
<------>irq_put_desc_unlock(desc, flags);
}
EXPORT_SYMBOL_GPL(disable_percpu_irq);
 
void disable_percpu_nmi(unsigned int irq)
{
<------>disable_percpu_irq(irq);
}
 
/*
 * Internal function to unregister a percpu irqaction.
 */
static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>struct irqaction *action;
<------>unsigned long flags;
 
<------>WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
 
<------>if (!desc)
<------><------>return NULL;
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
 
<------>action = desc->action;
<------>if (!action || action->percpu_dev_id != dev_id) {
<------><------>WARN(1, "Trying to free already-free IRQ %d\n", irq);
<------><------>goto bad;
<------>}
 
<------>if (!cpumask_empty(desc->percpu_enabled)) {
<------><------>WARN(1, "percpu IRQ %d still enabled on CPU%d!\n",
<------><------>     irq, cpumask_first(desc->percpu_enabled));
<------><------>goto bad;
<------>}
 
<------>/* Found it - now remove it from the list of entries: */
<------>desc->action = NULL;
 
<------>desc->istate &= ~IRQS_NMI;
 
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------>unregister_handler_proc(irq, action);
 
<------>irq_chip_pm_put(&desc->irq_data);
<------>module_put(desc->owner);
<------>return action;
 
bad:
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
<------>return NULL;
}
 
/**
 *	remove_percpu_irq - free a per-cpu interrupt
 *	@irq: Interrupt line to free
 *	@act: irqaction for the interrupt
 *
 * Used to remove interrupts statically setup by the early boot process.
 */
void remove_percpu_irq(unsigned int irq, struct irqaction *act)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
 
<------>if (desc && irq_settings_is_per_cpu_devid(desc))
<------>    __free_percpu_irq(irq, act->percpu_dev_id);
}
 
/**
 *	free_percpu_irq - free an interrupt allocated with request_percpu_irq
 *	@irq: Interrupt line to free
 *	@dev_id: Device identity to free
 *
 *	Remove a percpu interrupt handler. The handler is removed, but
 *	the interrupt line is not disabled. This must be done on each
 *	CPU before calling this function. The function does not return
 *	until any executing interrupts for this IRQ have completed.
 *
 *	This function must not be called from interrupt context.
 */
void free_percpu_irq(unsigned int irq, void __percpu *dev_id)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
 
<------>if (!desc || !irq_settings_is_per_cpu_devid(desc))
<------><------>return;
 
<------>chip_bus_lock(desc);
<------>kfree(__free_percpu_irq(irq, dev_id));
<------>chip_bus_sync_unlock(desc);
}
EXPORT_SYMBOL_GPL(free_percpu_irq);
 
void free_percpu_nmi(unsigned int irq, void __percpu *dev_id)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
 
<------>if (!desc || !irq_settings_is_per_cpu_devid(desc))
<------><------>return;
 
<------>if (WARN_ON(!(desc->istate & IRQS_NMI)))
<------><------>return;
 
<------>kfree(__free_percpu_irq(irq, dev_id));
}
 
/**
 *	setup_percpu_irq - setup a per-cpu interrupt
 *	@irq: Interrupt line to setup
 *	@act: irqaction for the interrupt
 *
 * Used to statically setup per-cpu interrupts in the early boot process.
 */
int setup_percpu_irq(unsigned int irq, struct irqaction *act)
{
<------>struct irq_desc *desc = irq_to_desc(irq);
<------>int retval;
 
<------>if (!desc || !irq_settings_is_per_cpu_devid(desc))
<------><------>return -EINVAL;
 
<------>retval = irq_chip_pm_get(&desc->irq_data);
<------>if (retval < 0)
<------><------>return retval;
 
<------>retval = __setup_irq(irq, desc, act);
 
<------>if (retval)
<------><------>irq_chip_pm_put(&desc->irq_data);
 
<------>return retval;
}
 
/**
 *	__request_percpu_irq - allocate a percpu interrupt line
 *	@irq: Interrupt line to allocate
 *	@handler: Function to be called when the IRQ occurs.
 *	@flags: Interrupt type flags (IRQF_TIMER only)
 *	@devname: An ascii name for the claiming device
 *	@dev_id: A percpu cookie passed back to the handler function
 *
 *	This call allocates interrupt resources and enables the
 *	interrupt on the local CPU. If the interrupt is supposed to be
 *	enabled on other CPUs, it has to be done on each CPU using
 *	enable_percpu_irq().
 *
 *	Dev_id must be globally unique. It is a per-cpu variable, and
 *	the handler gets called with the interrupted CPU's instance of
 *	that variable.
 */
int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
<------><------><------> unsigned long flags, const char *devname,
<------><------><------> void __percpu *dev_id)
{
<------>struct irqaction *action;
<------>struct irq_desc *desc;
<------>int retval;
 
<------>if (!dev_id)
<------><------>return -EINVAL;
 
<------>desc = irq_to_desc(irq);
<------>if (!desc || !irq_settings_can_request(desc) ||
<------>    !irq_settings_is_per_cpu_devid(desc))
<------><------>return -EINVAL;
 
<------>if (flags && flags != IRQF_TIMER)
<------><------>return -EINVAL;
 
<------>action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
<------>if (!action)
<------><------>return -ENOMEM;
 
<------>action->handler = handler;
<------>action->flags = flags | IRQF_PERCPU | IRQF_NO_SUSPEND;
<------>action->name = devname;
<------>action->percpu_dev_id = dev_id;
 
<------>retval = irq_chip_pm_get(&desc->irq_data);
<------>if (retval < 0) {
<------><------>kfree(action);
<------><------>return retval;
<------>}
 
<------>retval = __setup_irq(irq, desc, action);
 
<------>if (retval) {
<------><------>irq_chip_pm_put(&desc->irq_data);
<------><------>kfree(action);
<------>}
 
<------>return retval;
}
EXPORT_SYMBOL_GPL(__request_percpu_irq);
 
/**
 *	request_percpu_nmi - allocate a percpu interrupt line for NMI delivery
 *	@irq: Interrupt line to allocate
 *	@handler: Function to be called when the IRQ occurs.
 *	@name: An ascii name for the claiming device
 *	@dev_id: A percpu cookie passed back to the handler function
 *
 *	This call allocates interrupt resources for a per CPU NMI. Per CPU NMIs
 *	have to be setup on each CPU by calling prepare_percpu_nmi() before
 *	being enabled on the same CPU by using enable_percpu_nmi().
 *
 *	Dev_id must be globally unique. It is a per-cpu variable, and
 *	the handler gets called with the interrupted CPU's instance of
 *	that variable.
 *
 *	Interrupt lines requested for NMI delivering should have auto enabling
 *	setting disabled.
 *
 *	If the interrupt line cannot be used to deliver NMIs, function
 *	will fail returning a negative value.
 */
int request_percpu_nmi(unsigned int irq, irq_handler_t handler,
<------><------>       const char *name, void __percpu *dev_id)
{
<------>struct irqaction *action;
<------>struct irq_desc *desc;
<------>unsigned long flags;
<------>int retval;
 
<------>if (!handler)
<------><------>return -EINVAL;
 
<------>desc = irq_to_desc(irq);
 
<------>if (!desc || !irq_settings_can_request(desc) ||
<------>    !irq_settings_is_per_cpu_devid(desc) ||
<------>    irq_settings_can_autoenable(desc) ||
<------>    !irq_supports_nmi(desc))
<------><------>return -EINVAL;
 
<------>/* The line cannot already be NMI */
<------>if (desc->istate & IRQS_NMI)
<------><------>return -EINVAL;
 
<------>action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
<------>if (!action)
<------><------>return -ENOMEM;
 
<------>action->handler = handler;
<------>action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND | IRQF_NO_THREAD
<------><------>| IRQF_NOBALANCING;
<------>action->name = name;
<------>action->percpu_dev_id = dev_id;
 
<------>retval = irq_chip_pm_get(&desc->irq_data);
<------>if (retval < 0)
<------><------>goto err_out;
 
<------>retval = __setup_irq(irq, desc, action);
<------>if (retval)
<------><------>goto err_irq_setup;
 
<------>raw_spin_lock_irqsave(&desc->lock, flags);
<------>desc->istate |= IRQS_NMI;
<------>raw_spin_unlock_irqrestore(&desc->lock, flags);
 
<------>return 0;
 
err_irq_setup:
<------>irq_chip_pm_put(&desc->irq_data);
err_out:
<------>kfree(action);
 
<------>return retval;
}
 
/**
 *	prepare_percpu_nmi - performs CPU local setup for NMI delivery
 *	@irq: Interrupt line to prepare for NMI delivery
 *
 *	This call prepares an interrupt line to deliver NMI on the current CPU,
 *	before that interrupt line gets enabled with enable_percpu_nmi().
 *
 *	As a CPU local operation, this should be called from non-preemptible
 *	context.
 *
 *	If the interrupt line cannot be used to deliver NMIs, function
 *	will fail returning a negative value.
 */
int prepare_percpu_nmi(unsigned int irq)
{
<------>unsigned long flags;
<------>struct irq_desc *desc;
<------>int ret = 0;
 
<------>WARN_ON(preemptible());
 
<------>desc = irq_get_desc_lock(irq, &flags,
<------><------><------><------> IRQ_GET_DESC_CHECK_PERCPU);
<------>if (!desc)
<------><------>return -EINVAL;
 
<------>if (WARN(!(desc->istate & IRQS_NMI),
<------><------> KERN_ERR "prepare_percpu_nmi called for a non-NMI interrupt: irq %u\n",
<------><------> irq)) {
<------><------>ret = -EINVAL;
<------><------>goto out;
<------>}
 
<------>ret = irq_nmi_setup(desc);
<------>if (ret) {
<------><------>pr_err("Failed to setup NMI delivery: irq %u\n", irq);
<------><------>goto out;
<------>}
 
out:
<------>irq_put_desc_unlock(desc, flags);
<------>return ret;
}
 
/**
 *	teardown_percpu_nmi - undoes NMI setup of IRQ line
 *	@irq: Interrupt line from which CPU local NMI configuration should be
 *	      removed
 *
 *	This call undoes the setup done by prepare_percpu_nmi().
 *
 *	IRQ line should not be enabled for the current CPU.
 *
 *	As a CPU local operation, this should be called from non-preemptible
 *	context.
 */
void teardown_percpu_nmi(unsigned int irq)
{
<------>unsigned long flags;
<------>struct irq_desc *desc;
 
<------>WARN_ON(preemptible());
 
<------>desc = irq_get_desc_lock(irq, &flags,
<------><------><------><------> IRQ_GET_DESC_CHECK_PERCPU);
<------>if (!desc)
<------><------>return;
 
<------>if (WARN_ON(!(desc->istate & IRQS_NMI)))
<------><------>goto out;
 
<------>irq_nmi_teardown(desc);
out:
<------>irq_put_desc_unlock(desc, flags);
}
 
int __irq_get_irqchip_state(struct irq_data *data, enum irqchip_irq_state which,
<------><------><------>    bool *state)
{
<------>struct irq_chip *chip;
<------>int err = -EINVAL;
 
<------>do {
<------><------>chip = irq_data_get_irq_chip(data);
<------><------>if (WARN_ON_ONCE(!chip))
<------><------><------>return -ENODEV;
<------><------>if (chip->irq_get_irqchip_state)
<------><------><------>break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
<------><------>data = data->parent_data;
#else
<------><------>data = NULL;
#endif
<------>} while (data);
 
<------>if (data)
<------><------>err = chip->irq_get_irqchip_state(data, which, state);
<------>return err;
}
 
/**
 *	irq_get_irqchip_state - returns the irqchip state of a interrupt.
 *	@irq: Interrupt line that is forwarded to a VM
 *	@which: One of IRQCHIP_STATE_* the caller wants to know about
 *	@state: a pointer to a boolean where the state is to be storeed
 *
 *	This call snapshots the internal irqchip state of an
 *	interrupt, returning into @state the bit corresponding to
 *	stage @which
 *
 *	This function should be called with preemption disabled if the
 *	interrupt controller has per-cpu registers.
 */
int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
<------><------><------>  bool *state)
{
<------>struct irq_desc *desc;
<------>struct irq_data *data;
<------>unsigned long flags;
<------>int err = -EINVAL;
 
<------>desc = irq_get_desc_buslock(irq, &flags, 0);
<------>if (!desc)
<------><------>return err;
 
<------>data = irq_desc_get_irq_data(desc);
 
<------>err = __irq_get_irqchip_state(data, which, state);
 
<------>irq_put_desc_busunlock(desc, flags);
<------>return err;
}
EXPORT_SYMBOL_GPL(irq_get_irqchip_state);
 
/**
 *	irq_set_irqchip_state - set the state of a forwarded interrupt.
 *	@irq: Interrupt line that is forwarded to a VM
 *	@which: State to be restored (one of IRQCHIP_STATE_*)
 *	@val: Value corresponding to @which
 *
 *	This call sets the internal irqchip state of an interrupt,
 *	depending on the value of @which.
 *
 *	This function should be called with preemption disabled if the
 *	interrupt controller has per-cpu registers.
 */
int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
<------><------><------>  bool val)
{
<------>struct irq_desc *desc;
<------>struct irq_data *data;
<------>struct irq_chip *chip;
<------>unsigned long flags;
<------>int err = -EINVAL;
 
<------>desc = irq_get_desc_buslock(irq, &flags, 0);
<------>if (!desc)
<------><------>return err;
 
<------>data = irq_desc_get_irq_data(desc);
 
<------>do {
<------><------>chip = irq_data_get_irq_chip(data);
<------><------>if (WARN_ON_ONCE(!chip)) {
<------><------><------>err = -ENODEV;
<------><------><------>goto out_unlock;
<------><------>}
<------><------>if (chip->irq_set_irqchip_state)
<------><------><------>break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
<------><------>data = data->parent_data;
#else
<------><------>data = NULL;
#endif
<------>} while (data);
 
<------>if (data)
<------><------>err = chip->irq_set_irqchip_state(data, which, val);
 
out_unlock:
<------>irq_put_desc_busunlock(desc, flags);
<------>return err;
}
EXPORT_SYMBOL_GPL(irq_set_irqchip_state);