Release 4.15 kernel/irq/manage.c

/*
 * linux/kernel/irq/manage.c
 *
 * 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/slab.h>
#include <linux/sched.h>
#include <linux/sched/rt.h>
#include <linux/sched/task.h>
#include <uapi/linux/sched/types.h>
#include <linux/task_work.h>

#include "internals.h"

#ifdef CONFIG_IRQ_FORCED_THREADING

__read_mostly bool force_irqthreads;



static int __init setup_forced_irqthreads(char *arg)
{
	force_irqthreads = true;
	return 0;
}
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early_param("threadirqs", setup_forced_irqthreads);
#endif



static void __synchronize_hardirq(struct irq_desc *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);
		raw_spin_unlock_irqrestore(&desc->lock, flags);

		/* Oops, that failed? */
	} while (inprogress);
}

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/**
 *      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.
 */


bool synchronize_hardirq(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);

	if (desc) {
		__synchronize_hardirq(desc);
		return !atomic_read(&desc->threads_active);
	}

	return true;
}
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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.
 *
 *      This function may be called - with care - from IRQ context.
 */


void synchronize_irq(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);

	if (desc) {
		__synchronize_hardirq(desc);
		/*
                 * 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));
	}
}
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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;
}

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/**
 *      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));
}

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/**
 * 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);
}

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/**
 *      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);
}

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static void irq_validate_effective_affinity(struct irq_data *data)
{
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
	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);
#endif
}

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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;

	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);
	case IRQ_SET_MASK_OK_NOCOPY:
		irq_validate_effective_affinity(data);
		irq_set_thread_affinity(desc);
		ret = 0;
	}

	return ret;
}

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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_can_move_pcntxt(data)) {
		ret = irq_do_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);
		schedule_work(&desc->affinity_notify->work);
	}
	irqd_set(data, IRQD_AFFINITY_SET);

	return ret;
}

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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;
}

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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;
}
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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);
}

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/**
 *      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)
		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)
		kref_put(&old_notify->kref, old_notify->release);

	return 0;
}
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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 (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;
}
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#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));
}
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#endif

/*
 * Called when a bogus affinity is set via /proc/irq
 */


int irq_select_affinity_usr(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);
	unsigned long flags;
	int ret;

	raw_spin_lock_irqsave(&desc->lock, flags);
	ret = irq_setup_affinity(desc);
	raw_spin_unlock_irqrestore(&desc->lock, flags);
	return ret;
}
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#endif

/**
 *      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;
}
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EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);



void __disable_irq(struct irq_desc *desc)
{
	if (!desc->depth++)
		irq_disable(desc);
}

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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;
}

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/**
 *      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);
}
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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);
}
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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;
}
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EXPORT_SYMBOL_GPL(disable_hardirq);



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--;
	}
}

Contributors
Person
Tokens
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CommitProp
Ingo Molnar
33
43.42%
3
20.00%
Thomas Gleixner
24
31.58%
8
53.33%
Rafael J. Wysocki
11
14.47%
1
6.67%
Jiang Liu
4
5.26%
1
6.67%
Arjan van de Ven
3
3.95%
1
6.67%
Björn Helgaas
1
1.32%
1
6.67%
Total
76
100.00%
15
100.00%

/**
 *      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);
}
Contributors
Person
Tokens
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CommitProp
Thomas Gleixner
57
83.82%
4
57.14%
Ingo Molnar
7
10.29%
1
14.29%
Marc Zyngier
2
2.94%
1
14.29%
Yinghai Lu
2
2.94%
1
14.29%
Total
68
100.00%
7
100.00%


EXPORT_SYMBOL(enable_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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Uwe Kleine-König
47
62.67%
1
16.67%
Santosh Shilimkar
14
18.67%
1
16.67%
Thomas Gleixner
10
13.33%
2
33.33%
Yinghai Lu
3
4.00%
1
16.67%
David Brownell
1
1.33%
1
16.67%
Total
75
100.00%
6
100.00%

/**
 *      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".
 */


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;

	/* 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);
		}
	}
	irq_put_desc_busunlock(desc, flags);
	return ret;
}
Contributors
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Thomas Gleixner
67
39.88%
4
40.00%
David Brownell
45
26.79%
1
10.00%
Uwe Kleine-König
40
23.81%
1
10.00%
Jesper Juhl
9
5.36%
1
10.00%
Arjan van de Ven
4
2.38%
1
10.00%
Marc Zyngier
2
1.19%
1
10.00%
Yinghai Lu
1
0.60%
1
10.00%
Total
168
100.00%
10
100.00%


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;
}

Contributors
Person
Tokens
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CommitProp
Thomas Gleixner
37
43.53%
5
50.00%
Ingo Molnar
31
36.47%
1
10.00%
Yinghai Lu
13
15.29%
2
20.00%
Ben Hutchings
2
2.35%
1
10.00%
Marc Zyngier
2
2.35%
1
10.00%
Total
85
100.00%
10
100.00%



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);

	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 (%pF)\n",
		       flags, irq_desc_get_irq(desc), chip->irq_set_type);
	}
	if (unmask)
		unmask_irq(desc);
	return ret;
}

Contributors
Person
Tokens
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Thomas Gleixner
148
58.04%
6
40.00%
Uwe Kleine-König
65
25.49%
1
6.67%
David Brownell
23
9.02%
3
20.00%
Jiang Liu
11
4.31%
2
13.33%
Alexander Kuleshov
5
1.96%
1
6.67%
Andrew Morton
2
0.78%
1
6.67%
Mark Nelson
1
0.39%
1
6.67%
Total
255
100.00%
15
100.00%

#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;
}
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Thomas Gleixner
55
100.00%
1
100.00%
Total
55
100.00%
1
100.00%


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;
}

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Thomas Gleixner
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

/*
 * 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;
}

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Thomas Gleixner
25
100.00%
1
100.00%
Total
25
100.00%
1
100.00%



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;
}

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Thomas Gleixner
25
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1
100.00%
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25
100.00%
1
100.00%



static int irq_wait_for_interrupt(struct irqaction *action)
{
	set_current_state(TASK_INTERRUPTIBLE);

	while (!kthread_should_stop()) {

		if (test_and_clear_bit(IRQTF_RUNTHREAD,
				       &action->thread_flags)) {
			__set_current_state(TASK_RUNNING);
			return 0;
		}
		schedule();
		set_current_state(TASK_INTERRUPTIBLE);
	}
	__set_current_state(TASK_RUNNING);
	return -1;
}

Contributors
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Thomas Gleixner
33
52.38%
2
33.33%
Ido Yariv
15
23.81%
1
16.67%
Ingo Molnar
14
22.22%
2
33.33%
Yinghai Lu
1
1.59%
1
16.67%
Total
63
100.00%
6
100.00%

/*
 * 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);
}

Contributors
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Thomas Gleixner
153
100.00%
11
100.00%
Total
153
100.00%
11
100.00%

#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))
		cpumask_copy(mask, desc->irq_common_data.affinity);
	else
		valid = false;
	raw_spin_unlock_irq(&desc->lock);

	if (valid)
		set_cpus_allowed_ptr(current, mask);
	free_cpumask_var(mask);
}
Contributors
Person
Tokens
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CommitProp
Thomas Gleixner
118
95.93%
4
66.67%
Matthias Kaehlcke
3
2.44%
1
16.67%
Jiang Liu
2
1.63%
1
16.67%
Total
123
100.00%
6
100.00%

#else

static inline void

irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
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Bruno Prémont
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

#endif

/*
 * Interrupts which are not explicitely 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();
	ret = action->thread_fn(action->irq, action->dev_id);
	irq_finalize_oneshot(desc, action);
	local_bh_enable();
	return ret;
}

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Thomas Gleixner
41
82.00%
1
50.00%
Sebastian Andrzej Siewior
9
18.00%
1
50.00%
Total
50
100.00%
2
100.00%

/*
 * 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);
	irq_finalize_oneshot(desc, action);
	return ret;
}

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Thomas Gleixner
35
79.55%
1
50.00%
Sebastian Andrzej Siewior
9
20.45%
1
50.00%
Total
44
100.00%
2
100.00%



static void wake_threads_waitq(struct irq_desc *desc)
{
	if (atomic_dec_and_test(&desc->threads_active))
		wake_up(&desc->wait_for_threads);
}

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Ido Yariv
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%



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);
}

Contributors
Person
Tokens
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CommitProp
Oleg Nesterov
100
98.04%
1
33.33%
Linus Torvalds
1
0.98%
1
33.33%
Al Viro
1
0.98%
1
33.33%
Total
102
100.00%
3
100.00%



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);
}

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Thomas Gleixner
57
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1
100.00%
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57
100.00%
1
100.00%

/*
 * 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, false);

	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_HANDLED)
			atomic_inc(&desc->threads_handled);
		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_irq(). So neither IRQTF_RUNTHREAD nor the
         * oneshot mask bit can be set. We cannot verify that as we
         * cannot touch the oneshot mask at this point anymore as
         * __setup_irq() might have given out currents thread_mask
         * again.
         */
	task_work_cancel(current, irq_thread_dtor);
	return 0;
}

Contributors
Person
Tokens
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CommitProp
Thomas Gleixner
118
69.41%
6
50.00%
Oleg Nesterov
25
14.71%
1
8.33%
Sebastian Andrzej Siewior
13
7.65%
1
8.33%
Sankara Muthukrishnan
7
4.12%
1
8.33%
Ido Yariv
5
2.94%
1
8.33%
Al Viro
1
0.59%
1
8.33%
Alexander Gordeev
1
0.59%
1
8.33%
Total
170
100.00%
12
100.00%

/**
 *      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);
}
Contributors
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Thomas Gleixner
92
93.88%
1
50.00%
Daniel Lezcano
6
6.12%
1
50.00%
Total
98
100.00%
2
100.00%


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;

	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 != irq_default_primary_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;
}

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Thomas Gleixner
160
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2
100.00%
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160
100.00%
2
100.00%



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;
}

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Thomas Gleixner
44
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1
100.00%
Total
44
100.00%
1
100.00%



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);
}

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43
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2
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static int

setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
{
	struct task_struct *t;
	struct sched_param param = {
		.sched_priority = MAX_USER_RT_PRIO/2,
        };

	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);
		param.sched_priority -= 1;
	}

	if (IS_ERR(t))
		return PTR_ERR(t);

	sched_setscheduler_nocheck(t, SCHED_FIFO, &param);

	/*
         * 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.
         */
	get_task_struct(t);
	new->thread = 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;
}

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/*
 * 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_irq() to complete without holding the optional
         * chip bus lock and desc->lock.
         */
	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.
                 */
		unsigned int oldtype;

		/*
                 * 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 irq %d\n",
		       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;
}

Contributors
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CommitProp
Thomas Gleixner
804
71.15%
43
66.15%
Ingo Molnar
88
7.79%
2
3.08%
Marc Zyngier
38
3.36%
1
1.54%
Sebastian Andrzej Siewior
35
3.10%
1
1.54%
Dimitri Sivanich
29
2.57%
1
1.54%
Andrew Morton
26
2.30%
3
4.62%
Jon Hunter
24
2.12%
1
1.54%
David Brownell
24
2.12%
2
3.08%
Uwe Kleine-König
13
1.15%
1
1.54%
Linus Torvalds
13
1.15%
1
1.54%
Hans de Goede
13
1.15%
1
1.54%
Daniel Lezcano
7
0.62%
1
1.54%
Paul Mundt
7
0.62%
1
1.54%
Yinghai Lu
2
0.18%
1
1.54%
Alan Cox
2
0.18%
1
1.54%
Dan Carpenter
2
0.18%
1
1.54%
Joe Perches
1
0.09%
1
1.54%
Rasmus Villemoes
1
0.09%
1
1.54%
Björn Helgaas
1
0.09%
1
1.54%
Total
1130
100.00%
65
100.00%

/**
 *      setup_irq - setup an interrupt
 *      @irq: Interrupt line to setup
 *      @act: irqaction for the interrupt
 *
 * Used to statically setup interrupts in the early boot process.
 */


int setup_irq(unsigned int irq, struct irqaction *act)
{
	int retval;
	struct irq_desc *desc = irq_to_desc(irq);

	if (!desc || WARN_ON(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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Hunter
34
38.20%
2
40.00%
Thomas Gleixner
33
37.08%
1
20.00%
Marc Zyngier
14
15.73%
1
20.00%
David Daney
8
8.99%
1
20.00%
Total
89
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(setup_irq);

/*
 * Internal function to unregister an irqaction - used to free
 * regular and special interrupts that are part of the architecture.
 */


static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
{
	struct irq_desc *desc = irq_to_desc(irq);
	struct irqaction *action, **action_ptr;
	unsigned long flags;

	WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);

	if (!desc)
		return NULL;

	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);
		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_irq().
         *
         * Aside of that the bus_lock can also be taken from the threaded
         * handler in irq_finalize_oneshot() which results in a deadlock
         * because synchronize_irq() 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: */
	synchronize_irq(irq);

#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

	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);
		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;
}

Contributors
Person
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CommitProp
Ingo Molnar
150
37.88%
5
18.52%
Thomas Gleixner
134
33.84%
12
44.44%
David Woodhouse
34
8.59%
2
7.41%
Linus Torvalds
22
5.56%
1
3.70%
Peter P. Waskiewicz Jr
21
5.30%
1
3.70%
Magnus Damm
13
3.28%
2
7.41%
Jon Hunter
8
2.02%
1
3.70%
Sebastian Andrzej Siewior
7
1.77%
1
3.70%
Yinghai Lu
5
1.26%
1
3.70%
Paolo 'Blaisorblade' Giarrusso
2
0.51%
1
3.70%
Total
396
100.00%
27
100.00%

/**
 *      remove_irq - free an interrupt
 *      @irq: Interrupt line to free
 *      @act: irqaction for the interrupt
 *
 * Used to remove interrupts statically setup by the early boot process.
 */


void remove_irq(unsigned int irq, struct irqaction *act)
{
	struct irq_desc *desc = irq_to_desc(irq);

	if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc)))
		__free_irq(irq, act->dev_id);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Marc Zyngier
23
50.00%
1
33.33%
Magnus Damm
19
41.30%
1
33.33%
Ingo Molnar
4
8.70%
1
33.33%
Total
46
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(remove_irq);

/**
 *      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(irq, dev_id);

	if (!action)
		return NULL;

	devname = action->name;
	kfree(action);
	return devname;
}
Contributors
Person
Tokens
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Commits
CommitProp
Christoph Hellwig
30
29.41%
1
12.50%
Ben Hutchings
20
19.61%
1
12.50%
Magnus Damm
17
16.67%
2
25.00%
Thomas Gleixner
15
14.71%
1
12.50%
Marc Zyngier
8
7.84%
1
12.50%
Alexandru Moise
8
7.84%
1
12.50%
Ingo Molnar
4
3.92%
1
12.50%
Total
102
100.00%
8
100.00%


EXPORT_SYMBOL(free_irq);

/**
 *      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;
}
Contributors
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CommitProp
Ingo Molnar
109
33.85%
1
4.35%
Thomas Gleixner
50
15.53%
9
39.13%
Rafael J. Wysocki
32
9.94%
1
4.35%
David Woodhouse
30
9.32%
1
4.35%
Jon Hunter
27
8.39%
1
4.35%
Anton Vorontsov
27
8.39%
1
4.35%
Yinghai Lu
15
4.66%
3
13.04%
Chen Fan
10
3.11%
1
4.35%
Marc Zyngier
8
2.48%
1
4.35%
Shawn Lin
7
2.17%
1
4.35%
Luis Henriques
5
1.55%
1
4.35%
David Howells
1
0.31%
1
4.35%
Johannes Weiner
1
0.31%
1
4.35%
Total
322
100.00%
23
100.00%


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;
}
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Marc Zyngier
96
82.76%
1
33.33%
Chen Fan
17
14.66%
1
33.33%
Thomas Gleixner
3
2.59%
1
33.33%
Total
116
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(request_any_context_irq);



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);
}
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Marc Zyngier
117
97.50%
3
75.00%
Thomas Gleixner
3
2.50%
1
25.00%
Total
120
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(enable_percpu_irq);

/**
 * 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;
}
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Thomas Petazzoni
69
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1
100.00%
Total
69
100.00%
1
100.00%


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);
}
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Marc Zyngier
55
100.00%
1
100.00%
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55
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(disable_percpu_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;

	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;
}

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175
95.63%
1
50.00%
Jon Hunter
8
4.37%
1
50.00%
Total
183
100.00%
2
100.00%

/**
 *      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);
}

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42
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1
100.00%

/**
 *      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);
}
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Marc Zyngier
56
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100.00%
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56
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(free_percpu_irq);

/**
 *      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;
}

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56
64.37%
1
50.00%
Jon Hunter
31
35.63%
1
50.00%
Total
87
100.00%
2
100.00%

/**
 *      __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;
}
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142
72.08%
2
40.00%
Jon Hunter
29
14.72%
1
20.00%
Daniel Lezcano
19
9.64%
1
20.00%
Shawn Lin
7
3.55%
1
20.00%
Total
197
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(__request_percpu_irq);

/**
 *      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;
	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 (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);

	irq_put_desc_busunlock(desc, flags);
	return err;
}
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135
100.00%
1
100.00%


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 (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);

	irq_put_desc_busunlock(desc, flags);
	return err;
}
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Marc Zyngier
134
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1
100.00%
Total
134
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(irq_set_irqchip_state);
Overall Contributors
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CommitProp
Thomas Gleixner
3215
44.48%
94
44.34%
Marc Zyngier
1151
15.92%
8
3.77%
Ingo Molnar
550
7.61%
12
5.66%
Ben Hutchings
313
4.33%
2
0.94%
Uwe Kleine-König
165
2.28%
2
0.94%
Jon Hunter
161
2.23%
3
1.42%
Jiang Liu
144
1.99%
8
3.77%
Oleg Nesterov
128
1.77%
1
0.47%
Feng Wu
105
1.45%
1
0.47%
David Brownell
93
1.29%
4
1.89%
David Daney
82
1.13%
2
0.94%
Thomas Petazzoni
75
1.04%
1
0.47%
Peter P. Waskiewicz Jr
74
1.02%
1
0.47%
Sebastian Andrzej Siewior
73
1.01%
2
0.94%
Yinghai Lu
70
0.97%
5
2.36%
Rafael J. Wysocki
66
0.91%
2
0.94%
David Woodhouse
64
0.89%
2
0.94%
Magnus Damm
60
0.83%
3
1.42%
Ido Yariv
49
0.68%
2
0.94%
Peter Zijlstra
49
0.68%
1
0.47%
Prarit Bhargava
41
0.57%
1
0.47%
Daniel Lezcano
40
0.55%
3
1.42%
Herbert Xu
37
0.51%
1
0.47%
Linus Torvalds
36
0.50%
3
1.42%
Andrew Morton
35
0.48%
3
1.42%
Christoph Hellwig
31
0.43%
1
0.47%
Dimitri Sivanich
29
0.40%
1
0.47%
Anton Vorontsov
27
0.37%
1
0.47%
Chen Fan
27
0.37%
1
0.47%
Maksim Krasnyanskiy
23
0.32%
1
0.47%
Bruno Prémont
23
0.32%
1
0.47%
Shawn Lin
14
0.19%
1
0.47%
Jesse Brandeburg
14
0.19%
2
0.94%
Santosh Shilimkar
14
0.19%
1
0.47%
Hans de Goede
13
0.18%
1
0.47%
Rusty Russell
13
0.18%
1
0.47%
Chris Metcalf
10
0.14%
1
0.47%
Björn Andersson
10
0.14%
1
0.47%
Jesper Juhl
9
0.12%
1
0.47%
Maxime Ripard
9
0.12%
1
0.47%
Alexandru Moise
8
0.11%
1
0.47%
Sankara Muthukrishnan
7
0.10%
1
0.47%
Arjan van de Ven
7
0.10%
2
0.94%
Suresh B. Siddha
7
0.10%
1
0.47%
Paul Mundt
7
0.10%
1
0.47%
Sudip Mukherjee
5
0.07%
1
0.47%
Alexander Kuleshov
5
0.07%
1
0.47%
Luis Henriques
5
0.07%
1
0.47%
Matthew Wilcox
5
0.07%
1
0.47%
Clark Williams
3
0.04%
1
0.47%
Robert P. J. Day
3
0.04%
1
0.47%
Matthias Kaehlcke
3
0.04%
1
0.47%
Björn Helgaas
2
0.03%
1
0.47%
Dan Carpenter
2
0.03%
1
0.47%
Al Viro
2
0.03%
1
0.47%
Paolo 'Blaisorblade' Giarrusso
2
0.03%
1
0.47%
Alan Cox
2
0.03%
1
0.47%
Masahiro Yamada
1
0.01%
1
0.47%
Alexander Gordeev
1
0.01%
1
0.47%
Rasmus Villemoes
1
0.01%
1
0.47%
David Howells
1
0.01%
1
0.47%
Chuansheng Liu
1
0.01%
1
0.47%
Theodore Y. Ts'o
1
0.01%
1
0.47%
Johannes Weiner
1
0.01%
1
0.47%
Christoffer Dall
1
0.01%
1
0.47%
Joe Perches
1
0.01%
1
0.47%
Xie XiuQi
1
0.01%
1
0.47%
Mark Nelson
1
0.01%
1
0.47%
Total
7228
100.00%
212
100.00%
Directory: kernel/irq

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