Release 4.15 kernel/irq/chip.c

/*
 * linux/kernel/irq/chip.c
 *
 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
 *
 * This file contains the core interrupt handling code, for irq-chip
 * based architectures.
 *
 * Detailed information is available in Documentation/core-api/genericirq.rst
 */

#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/irqdomain.h>

#include <trace/events/irq.h>

#include "internals.h"



static irqreturn_t bad_chained_irq(int irq, void *dev_id)
{
	WARN_ONCE(1, "Chained irq %d should not call an action\n", irq);
	return IRQ_NONE;
}

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/*
 * Chained handlers should never call action on their IRQ. This default
 * action will emit warning if such thing happens.
 */

struct irqaction chained_action = {
	.handler = bad_chained_irq,
};

/**
 *      irq_set_chip - set the irq chip for an irq
 *      @irq:   irq number
 *      @chip:  pointer to irq chip description structure
 */


int irq_set_chip(unsigned int irq, struct irq_chip *chip)
{
	unsigned long flags;
	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);

	if (!desc)
		return -EINVAL;

	if (!chip)
		chip = &no_irq_chip;

	desc->irq_data.chip = chip;
	irq_put_desc_unlock(desc, flags);
	/*
         * For !CONFIG_SPARSE_IRQ make the irq show up in
         * allocated_irqs.
         */
	irq_mark_irq(irq);
	return 0;
}
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EXPORT_SYMBOL(irq_set_chip);

/**
 *      irq_set_type - set the irq trigger type for an irq
 *      @irq:   irq number
 *      @type:  IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
 */


int irq_set_irq_type(unsigned int irq, unsigned int type)
{
	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;

	ret = __irq_set_trigger(desc, type);
	irq_put_desc_busunlock(desc, flags);
	return ret;
}
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EXPORT_SYMBOL(irq_set_irq_type);

/**
 *      irq_set_handler_data - set irq handler data for an irq
 *      @irq:   Interrupt number
 *      @data:  Pointer to interrupt specific data
 *
 *      Set the hardware irq controller data for an irq
 */


int irq_set_handler_data(unsigned int irq, void *data)
{
	unsigned long flags;
	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);

	if (!desc)
		return -EINVAL;
	desc->irq_common_data.handler_data = data;
	irq_put_desc_unlock(desc, flags);
	return 0;
}
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EXPORT_SYMBOL(irq_set_handler_data);

/**
 *      irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
 *      @irq_base:      Interrupt number base
 *      @irq_offset:    Interrupt number offset
 *      @entry:         Pointer to MSI descriptor data
 *
 *      Set the MSI descriptor entry for an irq at offset
 */


int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
			 struct msi_desc *entry)
{
	unsigned long flags;
	struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);

	if (!desc)
		return -EINVAL;
	desc->irq_common_data.msi_desc = entry;
	if (entry && !irq_offset)
		entry->irq = irq_base;
	irq_put_desc_unlock(desc, flags);
	return 0;
}

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/**
 *      irq_set_msi_desc - set MSI descriptor data for an irq
 *      @irq:   Interrupt number
 *      @entry: Pointer to MSI descriptor data
 *
 *      Set the MSI descriptor entry for an irq
 */


int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
{
	return irq_set_msi_desc_off(irq, 0, entry);
}

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/**
 *      irq_set_chip_data - set irq chip data for an irq
 *      @irq:   Interrupt number
 *      @data:  Pointer to chip specific data
 *
 *      Set the hardware irq chip data for an irq
 */


int irq_set_chip_data(unsigned int irq, void *data)
{
	unsigned long flags;
	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);

	if (!desc)
		return -EINVAL;
	desc->irq_data.chip_data = data;
	irq_put_desc_unlock(desc, flags);
	return 0;
}
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EXPORT_SYMBOL(irq_set_chip_data);



struct irq_data *irq_get_irq_data(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);

	return desc ? &desc->irq_data : NULL;
}
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EXPORT_SYMBOL_GPL(irq_get_irq_data);



static void irq_state_clr_disabled(struct irq_desc *desc)
{
	irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
}

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static void irq_state_clr_masked(struct irq_desc *desc)
{
	irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
}

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static void irq_state_clr_started(struct irq_desc *desc)
{
	irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);
}

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static void irq_state_set_started(struct irq_desc *desc)
{
	irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
}

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enum {
	
IRQ_STARTUP_NORMAL,
	
IRQ_STARTUP_MANAGED,
	
IRQ_STARTUP_ABORT,
};

#ifdef CONFIG_SMP

static int

__irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
{
	struct irq_data *d = irq_desc_get_irq_data(desc);

	if (!irqd_affinity_is_managed(d))
		return IRQ_STARTUP_NORMAL;

	irqd_clr_managed_shutdown(d);

	if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) {
		/*
                 * Catch code which fiddles with enable_irq() on a managed
                 * and potentially shutdown IRQ. Chained interrupt
                 * installment or irq auto probing should not happen on
                 * managed irqs either.
                 */
		if (WARN_ON_ONCE(force))
			return IRQ_STARTUP_ABORT;
		/*
                 * The interrupt was requested, but there is no online CPU
                 * in it's affinity mask. Put it into managed shutdown
                 * state and let the cpu hotplug mechanism start it up once
                 * a CPU in the mask becomes available.
                 */
		return IRQ_STARTUP_ABORT;
	}
	/*
         * Managed interrupts have reserved resources, so this should not
         * happen.
         */
	if (WARN_ON(irq_domain_activate_irq(d, false)))
		return IRQ_STARTUP_ABORT;
	return IRQ_STARTUP_MANAGED;
}
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#else

static __always_inline int

__irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
{
	return IRQ_STARTUP_NORMAL;
}
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#endif



static int __irq_startup(struct irq_desc *desc)
{
	struct irq_data *d = irq_desc_get_irq_data(desc);
	int ret = 0;

	/* Warn if this interrupt is not activated but try nevertheless */
	WARN_ON_ONCE(!irqd_is_activated(d));

	if (d->chip->irq_startup) {
		ret = d->chip->irq_startup(d);
		irq_state_clr_disabled(desc);
		irq_state_clr_masked(desc);
	} else {
		irq_enable(desc);
	}
	irq_state_set_started(desc);
	return ret;
}

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int irq_startup(struct irq_desc *desc, bool resend, bool force)
{
	struct irq_data *d = irq_desc_get_irq_data(desc);
	struct cpumask *aff = irq_data_get_affinity_mask(d);
	int ret = 0;

	desc->depth = 0;

	if (irqd_is_started(d)) {
		irq_enable(desc);
	} else {
		switch (__irq_startup_managed(desc, aff, force)) {
		case IRQ_STARTUP_NORMAL:
			ret = __irq_startup(desc);
			irq_setup_affinity(desc);
			break;
		case IRQ_STARTUP_MANAGED:
			irq_do_set_affinity(d, aff, false);
			ret = __irq_startup(desc);
			break;
		case IRQ_STARTUP_ABORT:
			irqd_set_managed_shutdown(d);
			return 0;
		}
	}
	if (resend)
		check_irq_resend(desc);

	return ret;
}

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int irq_activate(struct irq_desc *desc)
{
	struct irq_data *d = irq_desc_get_irq_data(desc);

	if (!irqd_affinity_is_managed(d))
		return irq_domain_activate_irq(d, false);
	return 0;
}

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void irq_activate_and_startup(struct irq_desc *desc, bool resend)
{
	if (WARN_ON(irq_activate(desc)))
		return;
	irq_startup(desc, resend, IRQ_START_FORCE);
}

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static void __irq_disable(struct irq_desc *desc, bool mask);



void irq_shutdown(struct irq_desc *desc)
{
	if (irqd_is_started(&desc->irq_data)) {
		desc->depth = 1;
		if (desc->irq_data.chip->irq_shutdown) {
			desc->irq_data.chip->irq_shutdown(&desc->irq_data);
			irq_state_set_disabled(desc);
			irq_state_set_masked(desc);
		} else {
			__irq_disable(desc, true);
		}
		irq_state_clr_started(desc);
	}
	/*
         * This must be called even if the interrupt was never started up,
         * because the activation can happen before the interrupt is
         * available for request/startup. It has it's own state tracking so
         * it's safe to call it unconditionally.
         */
	irq_domain_deactivate_irq(&desc->irq_data);
}

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void irq_enable(struct irq_desc *desc)
{
	if (!irqd_irq_disabled(&desc->irq_data)) {
		unmask_irq(desc);
	} else {
		irq_state_clr_disabled(desc);
		if (desc->irq_data.chip->irq_enable) {
			desc->irq_data.chip->irq_enable(&desc->irq_data);
			irq_state_clr_masked(desc);
		} else {
			unmask_irq(desc);
		}
	}
}

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static void __irq_disable(struct irq_desc *desc, bool mask)
{
	if (irqd_irq_disabled(&desc->irq_data)) {
		if (mask)
			mask_irq(desc);
	} else {
		irq_state_set_disabled(desc);
		if (desc->irq_data.chip->irq_disable) {
			desc->irq_data.chip->irq_disable(&desc->irq_data);
			irq_state_set_masked(desc);
		} else if (mask) {
			mask_irq(desc);
		}
	}
}

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/**
 * irq_disable - Mark interrupt disabled
 * @desc:       irq descriptor which should be disabled
 *
 * If the chip does not implement the irq_disable callback, we
 * use a lazy disable approach. That means we mark the interrupt
 * disabled, but leave the hardware unmasked. That's an
 * optimization because we avoid the hardware access for the
 * common case where no interrupt happens after we marked it
 * disabled. If an interrupt happens, then the interrupt flow
 * handler masks the line at the hardware level and marks it
 * pending.
 *
 * If the interrupt chip does not implement the irq_disable callback,
 * a driver can disable the lazy approach for a particular irq line by
 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
 * be used for devices which cannot disable the interrupt at the
 * device level under certain circumstances and have to use
 * disable_irq[_nosync] instead.
 */


void irq_disable(struct irq_desc *desc)
{
	__irq_disable(desc, irq_settings_disable_unlazy(desc));
}

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void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
{
	if (desc->irq_data.chip->irq_enable)
		desc->irq_data.chip->irq_enable(&desc->irq_data);
	else
		desc->irq_data.chip->irq_unmask(&desc->irq_data);
	cpumask_set_cpu(cpu, desc->percpu_enabled);
}

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void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
{
	if (desc->irq_data.chip->irq_disable)
		desc->irq_data.chip->irq_disable(&desc->irq_data);
	else
		desc->irq_data.chip->irq_mask(&desc->irq_data);
	cpumask_clear_cpu(cpu, desc->percpu_enabled);
}

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static inline void mask_ack_irq(struct irq_desc *desc)
{
	if (desc->irq_data.chip->irq_mask_ack) {
		desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
		irq_state_set_masked(desc);
	} else {
		mask_irq(desc);
		if (desc->irq_data.chip->irq_ack)
			desc->irq_data.chip->irq_ack(&desc->irq_data);
	}
}

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void mask_irq(struct irq_desc *desc)
{
	if (irqd_irq_masked(&desc->irq_data))
		return;

	if (desc->irq_data.chip->irq_mask) {
		desc->irq_data.chip->irq_mask(&desc->irq_data);
		irq_state_set_masked(desc);
	}
}

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void unmask_irq(struct irq_desc *desc)
{
	if (!irqd_irq_masked(&desc->irq_data))
		return;

	if (desc->irq_data.chip->irq_unmask) {
		desc->irq_data.chip->irq_unmask(&desc->irq_data);
		irq_state_clr_masked(desc);
	}
}

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void unmask_threaded_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = desc->irq_data.chip;

	if (chip->flags & IRQCHIP_EOI_THREADED)
		chip->irq_eoi(&desc->irq_data);

	unmask_irq(desc);
}

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/*
 *      handle_nested_irq - Handle a nested irq from a irq thread
 *      @irq:   the interrupt number
 *
 *      Handle interrupts which are nested into a threaded interrupt
 *      handler. The handler function is called inside the calling
 *      threads context.
 */


void handle_nested_irq(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);
	struct irqaction *action;
	irqreturn_t action_ret;

	might_sleep();

	raw_spin_lock_irq(&desc->lock);

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	action = desc->action;
	if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
		desc->istate |= IRQS_PENDING;
		goto out_unlock;
	}

	kstat_incr_irqs_this_cpu(desc);
	irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
	raw_spin_unlock_irq(&desc->lock);

	action_ret = IRQ_NONE;
	for_each_action_of_desc(desc, action)
		action_ret |= action->thread_fn(action->irq, action->dev_id);

	if (!noirqdebug)
		note_interrupt(desc, action_ret);

	raw_spin_lock_irq(&desc->lock);
	irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);

out_unlock:
	raw_spin_unlock_irq(&desc->lock);
}
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EXPORT_SYMBOL_GPL(handle_nested_irq);



static bool irq_check_poll(struct irq_desc *desc)
{
	if (!(desc->istate & IRQS_POLL_INPROGRESS))
		return false;
	return irq_wait_for_poll(desc);
}

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static bool irq_may_run(struct irq_desc *desc)
{
	unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;

	/*
         * If the interrupt is not in progress and is not an armed
         * wakeup interrupt, proceed.
         */
	if (!irqd_has_set(&desc->irq_data, mask))
		return true;

	/*
         * If the interrupt is an armed wakeup source, mark it pending
         * and suspended, disable it and notify the pm core about the
         * event.
         */
	if (irq_pm_check_wakeup(desc))
		return false;

	/*
         * Handle a potential concurrent poll on a different core.
         */
	return irq_check_poll(desc);
}

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100.00%
2
100.00%
Total
54
100.00%
2
100.00%

/**
 *      handle_simple_irq - Simple and software-decoded IRQs.
 *      @desc:  the interrupt description structure for this irq
 *
 *      Simple interrupts are either sent from a demultiplexing interrupt
 *      handler or come from hardware, where no interrupt hardware control
 *      is necessary.
 *
 *      Note: The caller is expected to handle the ack, clear, mask and
 *      unmask issues if necessary.
 */


void handle_simple_irq(struct irq_desc *desc)
{
	raw_spin_lock(&desc->lock);

	if (!irq_may_run(desc))
		goto out_unlock;

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
		desc->istate |= IRQS_PENDING;
		goto out_unlock;
	}

	kstat_incr_irqs_this_cpu(desc);
	handle_irq_event(desc);

out_unlock:
	raw_spin_unlock(&desc->lock);
}
Contributors
Person
Tokens
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CommitProp
Thomas Gleixner
68
76.40%
8
72.73%
Steven Rostedt
8
8.99%
1
9.09%
Ning Jiang
8
8.99%
1
9.09%
Sudeep Holla
5
5.62%
1
9.09%
Total
89
100.00%
11
100.00%


EXPORT_SYMBOL_GPL(handle_simple_irq);

/**
 *      handle_untracked_irq - Simple and software-decoded IRQs.
 *      @desc:  the interrupt description structure for this irq
 *
 *      Untracked interrupts are sent from a demultiplexing interrupt
 *      handler when the demultiplexer does not know which device it its
 *      multiplexed irq domain generated the interrupt. IRQ's handled
 *      through here are not subjected to stats tracking, randomness, or
 *      spurious interrupt detection.
 *
 *      Note: Like handle_simple_irq, the caller is expected to handle
 *      the ack, clear, mask and unmask issues if necessary.
 */


void handle_untracked_irq(struct irq_desc *desc)
{
	unsigned int flags = 0;

	raw_spin_lock(&desc->lock);

	if (!irq_may_run(desc))
		goto out_unlock;

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
		desc->istate |= IRQS_PENDING;
		goto out_unlock;
	}

	desc->istate &= ~IRQS_PENDING;
	irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
	raw_spin_unlock(&desc->lock);

	__handle_irq_event_percpu(desc, &flags);

	raw_spin_lock(&desc->lock);
	irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);

out_unlock:
	raw_spin_unlock(&desc->lock);
}
Contributors
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Keith Busch
136
100.00%
1
100.00%
Total
136
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(handle_untracked_irq);

/*
 * Called unconditionally from handle_level_irq() and only for oneshot
 * interrupts from handle_fasteoi_irq()
 */


static void cond_unmask_irq(struct irq_desc *desc)
{
	/*
         * We need to unmask in the following cases:
         * - Standard level irq (IRQF_ONESHOT is not set)
         * - Oneshot irq which did not wake the thread (caused by a
         *   spurious interrupt or a primary handler handling it
         *   completely).
         */
	if (!irqd_irq_disabled(&desc->irq_data) &&
	    irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
		unmask_irq(desc);
}

Contributors
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Thomas Gleixner
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%

/**
 *      handle_level_irq - Level type irq handler
 *      @desc:  the interrupt description structure for this irq
 *
 *      Level type interrupts are active as long as the hardware line has
 *      the active level. This may require to mask the interrupt and unmask
 *      it after the associated handler has acknowledged the device, so the
 *      interrupt line is back to inactive.
 */


void handle_level_irq(struct irq_desc *desc)
{
	raw_spin_lock(&desc->lock);
	mask_ack_irq(desc);

	if (!irq_may_run(desc))
		goto out_unlock;

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	/*
         * If its disabled or no action available
         * keep it masked and get out of here
         */
	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
		desc->istate |= IRQS_PENDING;
		goto out_unlock;
	}

	kstat_incr_irqs_this_cpu(desc);
	handle_irq_event(desc);

	cond_unmask_irq(desc);

out_unlock:
	raw_spin_unlock(&desc->lock);
}
Contributors
Person
Tokens
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CommitProp
Thomas Gleixner
91
91.00%
11
84.62%
Sudeep Holla
5
5.00%
1
7.69%
Ingo Molnar
4
4.00%
1
7.69%
Total
100
100.00%
13
100.00%


EXPORT_SYMBOL_GPL(handle_level_irq);

#ifdef CONFIG_IRQ_PREFLOW_FASTEOI


static inline void preflow_handler(struct irq_desc *desc)
{
	if (desc->preflow_handler)
		desc->preflow_handler(&desc->irq_data);
}
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Thomas Gleixner
28
100.00%
1
100.00%
Total
28
100.00%
1
100.00%

#else


static inline void preflow_handler(struct irq_desc *desc) { }
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Thomas Gleixner
11
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1
100.00%
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11
100.00%
1
100.00%

#endif



static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
{
	if (!(desc->istate & IRQS_ONESHOT)) {
		chip->irq_eoi(&desc->irq_data);
		return;
	}
	/*
         * We need to unmask in the following cases:
         * - Oneshot irq which did not wake the thread (caused by a
         *   spurious interrupt or a primary handler handling it
         *   completely).
         */
	if (!irqd_irq_disabled(&desc->irq_data) &&
	    irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
		chip->irq_eoi(&desc->irq_data);
		unmask_irq(desc);
	} else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
		chip->irq_eoi(&desc->irq_data);
	}
}

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Thomas Gleixner
106
100.00%
1
100.00%
Total
106
100.00%
1
100.00%

/**
 *      handle_fasteoi_irq - irq handler for transparent controllers
 *      @desc:  the interrupt description structure for this irq
 *
 *      Only a single callback will be issued to the chip: an ->eoi()
 *      call when the interrupt has been serviced. This enables support
 *      for modern forms of interrupt handlers, which handle the flow
 *      details in hardware, transparently.
 */


void handle_fasteoi_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = desc->irq_data.chip;

	raw_spin_lock(&desc->lock);

	if (!irq_may_run(desc))
		goto out;

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	/*
         * If its disabled or no action available
         * then mask it and get out of here:
         */
	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
		desc->istate |= IRQS_PENDING;
		mask_irq(desc);
		goto out;
	}

	kstat_incr_irqs_this_cpu(desc);
	if (desc->istate & IRQS_ONESHOT)
		mask_irq(desc);

	preflow_handler(desc);
	handle_irq_event(desc);

	cond_unmask_eoi_irq(desc, chip);

	raw_spin_unlock(&desc->lock);
	return;
out:
	if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
		chip->irq_eoi(&desc->irq_data);
	raw_spin_unlock(&desc->lock);
}
Contributors
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Thomas Gleixner
145
90.06%
15
78.95%
Benjamin Herrenschmidt
6
3.73%
1
5.26%
Ingo Molnar
5
3.11%
2
10.53%
Sudeep Holla
5
3.11%
1
5.26%
Total
161
100.00%
19
100.00%


EXPORT_SYMBOL_GPL(handle_fasteoi_irq);

/**
 *      handle_edge_irq - edge type IRQ handler
 *      @desc:  the interrupt description structure for this irq
 *
 *      Interrupt occures on the falling and/or rising edge of a hardware
 *      signal. The occurrence is latched into the irq controller hardware
 *      and must be acked in order to be reenabled. After the ack another
 *      interrupt can happen on the same source even before the first one
 *      is handled by the associated event handler. If this happens it
 *      might be necessary to disable (mask) the interrupt depending on the
 *      controller hardware. This requires to reenable the interrupt inside
 *      of the loop which handles the interrupts which have arrived while
 *      the handler was running. If all pending interrupts are handled, the
 *      loop is left.
 */


void handle_edge_irq(struct irq_desc *desc)
{
	raw_spin_lock(&desc->lock);

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	if (!irq_may_run(desc)) {
		desc->istate |= IRQS_PENDING;
		mask_ack_irq(desc);
		goto out_unlock;
	}

	/*
         * If its disabled or no action available then mask it and get
         * out of here.
         */
	if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
		desc->istate |= IRQS_PENDING;
		mask_ack_irq(desc);
		goto out_unlock;
	}

	kstat_incr_irqs_this_cpu(desc);

	/* Start handling the irq */
	desc->irq_data.chip->irq_ack(&desc->irq_data);

	do {
		if (unlikely(!desc->action)) {
			mask_irq(desc);
			goto out_unlock;
		}

		/*
                 * When another irq arrived while we were handling
                 * one, we could have masked the irq.
                 * Renable it, if it was not disabled in meantime.
                 */
		if (unlikely(desc->istate & IRQS_PENDING)) {
			if (!irqd_irq_disabled(&desc->irq_data) &&
			    irqd_irq_masked(&desc->irq_data))
				unmask_irq(desc);
		}

		handle_irq_event(desc);

	} while ((desc->istate & IRQS_PENDING) &&
		 !irqd_irq_disabled(&desc->irq_data));

out_unlock:
	raw_spin_unlock(&desc->lock);
}
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Thomas Gleixner
194
96.52%
16
88.89%
Wang Chen
4
1.99%
1
5.56%
Yinghai Lu
3
1.49%
1
5.56%
Total
201
100.00%
18
100.00%


EXPORT_SYMBOL(handle_edge_irq);

#ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
/**
 *      handle_edge_eoi_irq - edge eoi type IRQ handler
 *      @desc:  the interrupt description structure for this irq
 *
 * Similar as the above handle_edge_irq, but using eoi and w/o the
 * mask/unmask logic.
 */


void handle_edge_eoi_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = irq_desc_get_chip(desc);

	raw_spin_lock(&desc->lock);

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	if (!irq_may_run(desc)) {
		desc->istate |= IRQS_PENDING;
		goto out_eoi;
	}

	/*
         * If its disabled or no action available then mask it and get
         * out of here.
         */
	if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
		desc->istate |= IRQS_PENDING;
		goto out_eoi;
	}

	kstat_incr_irqs_this_cpu(desc);

	do {
		if (unlikely(!desc->action))
			goto out_eoi;

		handle_irq_event(desc);

	} while ((desc->istate & IRQS_PENDING) &&
		 !irqd_irq_disabled(&desc->irq_data));

out_eoi:
	chip->irq_eoi(&desc->irq_data);
	raw_spin_unlock(&desc->lock);
}
Contributors
Person
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Thomas Gleixner
150
99.34%
3
75.00%
Stephen Rothwell
1
0.66%
1
25.00%
Total
151
100.00%
4
100.00%

#endif

/**
 *      handle_percpu_irq - Per CPU local irq handler
 *      @desc:  the interrupt description structure for this irq
 *
 *      Per CPU interrupts on SMP machines without locking requirements
 */


void handle_percpu_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = irq_desc_get_chip(desc);

	kstat_incr_irqs_this_cpu(desc);

	if (chip->irq_ack)
		chip->irq_ack(&desc->irq_data);

	handle_irq_event_percpu(desc);

	if (chip->irq_eoi)
		chip->irq_eoi(&desc->irq_data);
}

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Thomas Gleixner
59
95.16%
7
87.50%
Yinghai Lu
3
4.84%
1
12.50%
Total
62
100.00%
8
100.00%

/**
 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
 * @desc:       the interrupt description structure for this irq
 *
 * Per CPU interrupts on SMP machines without locking requirements. Same as
 * handle_percpu_irq() above but with the following extras:
 *
 * action->percpu_dev_id is a pointer to percpu variables which
 * contain the real device id for the cpu on which this handler is
 * called
 */


void handle_percpu_devid_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct irqaction *action = desc->action;
	unsigned int irq = irq_desc_get_irq(desc);
	irqreturn_t res;

	kstat_incr_irqs_this_cpu(desc);

	if (chip->irq_ack)
		chip->irq_ack(&desc->irq_data);

	if (likely(action)) {
		trace_irq_handler_entry(irq, action);
		res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
		trace_irq_handler_exit(irq, action, res);
	} else {
		unsigned int cpu = smp_processor_id();
		bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);

		if (enabled)
			irq_percpu_disable(desc, cpu);

		pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
			    enabled ? " and unmasked" : "", irq, cpu);
	}

	if (chip->irq_eoi)
		chip->irq_eoi(&desc->irq_data);
}

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Marc Zyngier
95
56.89%
1
33.33%
Thomas Gleixner
72
43.11%
2
66.67%
Total
167
100.00%
3
100.00%


static void

__irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
		     int is_chained, const char *name)
{
	if (!handle) {
		handle = handle_bad_irq;
	} else {
		struct irq_data *irq_data = &desc->irq_data;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
		/*
                 * With hierarchical domains we might run into a
                 * situation where the outermost chip is not yet set
                 * up, but the inner chips are there.  Instead of
                 * bailing we install the handler, but obviously we
                 * cannot enable/startup the interrupt at this point.
                 */
		while (irq_data) {
			if (irq_data->chip != &no_irq_chip)
				break;
			/*
                         * Bail out if the outer chip is not set up
                         * and the interrrupt supposed to be started
                         * right away.
                         */
			if (WARN_ON(is_chained))
				return;
			/* Try the parent */
			irq_data = irq_data->parent_data;
		}
#endif
		if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
			return;
	}

	/* Uninstall? */
	if (handle == handle_bad_irq) {
		if (desc->irq_data.chip != &no_irq_chip)
			mask_ack_irq(desc);
		irq_state_set_disabled(desc);
		if (is_chained)
			desc->action = NULL;
		desc->depth = 1;
	}
	desc->handle_irq = handle;
	desc->name = name;

	if (handle != handle_bad_irq && is_chained) {
		unsigned int type = irqd_get_trigger_type(&desc->irq_data);

		/*
                 * We're about to start this interrupt immediately,
                 * hence the need to set the trigger configuration.
                 * But the .set_type callback may have overridden the
                 * flow handler, ignoring that we're dealing with a
                 * chained interrupt. Reset it immediately because we
                 * do know better.
                 */
		if (type != IRQ_TYPE_NONE) {
			__irq_set_trigger(desc, type);
			desc->handle_irq = handle;
		}

		irq_settings_set_noprobe(desc);
		irq_settings_set_norequest(desc);
		irq_settings_set_nothread(desc);
		desc->action = &chained_action;
		irq_activate_and_startup(desc, IRQ_RESEND);
	}
}

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Thomas Gleixner
98
42.42%
11
52.38%
Marc Zyngier
84
36.36%
3
14.29%
Mika Westerberg
17
7.36%
1
4.76%
Ingo Molnar
11
4.76%
1
4.76%
Russell King
8
3.46%
1
4.76%
David Howells
6
2.60%
1
4.76%
Paul Mundt
5
2.16%
1
4.76%
Wei Yongjun
1
0.43%
1
4.76%
Jan Beulich
1
0.43%
1
4.76%
Total
231
100.00%
21
100.00%


void

__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
		  const char *name)
{
	unsigned long flags;
	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);

	if (!desc)
		return;

	__irq_do_set_handler(desc, handle, is_chained, name);
	irq_put_desc_busunlock(desc, flags);
}
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Russell King
55
87.30%
1
33.33%
Thomas Gleixner
8
12.70%
2
66.67%
Total
63
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(__irq_set_handler);


void

irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
				 void *data)
{
	unsigned long flags;
	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);

	if (!desc)
		return;

	desc->irq_common_data.handler_data = data;
	__irq_do_set_handler(desc, handle, 1, NULL);

	irq_put_desc_busunlock(desc, flags);
}
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Russell King
58
86.57%
1
33.33%
Thomas Gleixner
9
13.43%
2
66.67%
Total
67
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);


void

irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
			      irq_flow_handler_t handle, const char *name)
{
	irq_set_chip(irq, chip);
	__irq_set_handler(irq, handle, 0, name);
}
Contributors
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Tokens
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CommitProp
Ingo Molnar
29
72.50%
1
16.67%
Thomas Gleixner
6
15.00%
3
50.00%
David Howells
4
10.00%
1
16.67%
Russell King
1
2.50%
1
16.67%
Total
40
100.00%
6
100.00%


EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);



void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
{
	unsigned long flags, trigger, tmp;
	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);

	if (!desc)
		return;

	/*
         * Warn when a driver sets the no autoenable flag on an already
         * active interrupt.
         */
	WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));

	irq_settings_clr_and_set(desc, clr, set);

	trigger = irqd_get_trigger_type(&desc->irq_data);

	irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
		   IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
	if (irq_settings_has_no_balance_set(desc))
		irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
	if (irq_settings_is_per_cpu(desc))
		irqd_set(&desc->irq_data, IRQD_PER_CPU);
	if (irq_settings_can_move_pcntxt(desc))
		irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
	if (irq_settings_is_level(desc))
		irqd_set(&desc->irq_data, IRQD_LEVEL);

	tmp = irq_settings_get_trigger_mask(desc);
	if (tmp != IRQ_TYPE_NONE)
		trigger = tmp;

	irqd_set(&desc->irq_data, trigger);

	irq_put_desc_unlock(desc, flags);
}
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Thomas Gleixner
135
67.50%
8
66.67%
Marc Zyngier
34
17.00%
2
16.67%
Ralf Bächle
29
14.50%
1
8.33%
Yinghai Lu
2
1.00%
1
8.33%
Total
200
100.00%
12
100.00%


EXPORT_SYMBOL_GPL(irq_modify_status);

/**
 *      irq_cpu_online - Invoke all irq_cpu_online functions.
 *
 *      Iterate through all irqs and invoke the chip.irq_cpu_online()
 *      for each.
 */


void irq_cpu_online(void)
{
	struct irq_desc *desc;
	struct irq_chip *chip;
	unsigned long flags;
	unsigned int irq;

	for_each_active_irq(irq) {
		desc = irq_to_desc(irq);
		if (!desc)
			continue;

		raw_spin_lock_irqsave(&desc->lock, flags);

		chip = irq_data_get_irq_chip(&desc->irq_data);
		if (chip && chip->irq_cpu_online &&
		    (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
		     !irqd_irq_disabled(&desc->irq_data)))
			chip->irq_cpu_online(&desc->irq_data);

		raw_spin_unlock_irqrestore(&desc->lock, flags);
	}
}

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David Daney
92
82.14%
1
33.33%
Thomas Gleixner
20
17.86%
2
66.67%
Total
112
100.00%
3
100.00%

/**
 *      irq_cpu_offline - Invoke all irq_cpu_offline functions.
 *
 *      Iterate through all irqs and invoke the chip.irq_cpu_offline()
 *      for each.
 */


void irq_cpu_offline(void)
{
	struct irq_desc *desc;
	struct irq_chip *chip;
	unsigned long flags;
	unsigned int irq;

	for_each_active_irq(irq) {
		desc = irq_to_desc(irq);
		if (!desc)
			continue;

		raw_spin_lock_irqsave(&desc->lock, flags);

		chip = irq_data_get_irq_chip(&desc->irq_data);
		if (chip && chip->irq_cpu_offline &&
		    (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
		     !irqd_irq_disabled(&desc->irq_data)))
			chip->irq_cpu_offline(&desc->irq_data);

		raw_spin_unlock_irqrestore(&desc->lock, flags);
	}
}

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#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

#ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
/**
 *      handle_fasteoi_ack_irq - irq handler for edge hierarchy
 *      stacked on transparent controllers
 *
 *      @desc:  the interrupt description structure for this irq
 *
 *      Like handle_fasteoi_irq(), but for use with hierarchy where
 *      the irq_chip also needs to have its ->irq_ack() function
 *      called.
 */


void handle_fasteoi_ack_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = desc->irq_data.chip;

	raw_spin_lock(&desc->lock);

	if (!irq_may_run(desc))
		goto out;

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	/*
         * If its disabled or no action available
         * then mask it and get out of here:
         */
	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
		desc->istate |= IRQS_PENDING;
		mask_irq(desc);
		goto out;
	}

	kstat_incr_irqs_this_cpu(desc);
	if (desc->istate & IRQS_ONESHOT)
		mask_irq(desc);

	/* Start handling the irq */
	desc->irq_data.chip->irq_ack(&desc->irq_data);

	preflow_handler(desc);
	handle_irq_event(desc);

	cond_unmask_eoi_irq(desc, chip);

	raw_spin_unlock(&desc->lock);
	return;
out:
	if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
		chip->irq_eoi(&desc->irq_data);
	raw_spin_unlock(&desc->lock);
}
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EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);

/**
 *      handle_fasteoi_mask_irq - irq handler for level hierarchy
 *      stacked on transparent controllers
 *
 *      @desc:  the interrupt description structure for this irq
 *
 *      Like handle_fasteoi_irq(), but for use with hierarchy where
 *      the irq_chip also needs to have its ->irq_mask_ack() function
 *      called.
 */


void handle_fasteoi_mask_irq(struct irq_desc *desc)
{
	struct irq_chip *chip = desc->irq_data.chip;

	raw_spin_lock(&desc->lock);
	mask_ack_irq(desc);

	if (!irq_may_run(desc))
		goto out;

	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	/*
         * If its disabled or no action available
         * then mask it and get out of here:
         */
	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
		desc->istate |= IRQS_PENDING;
		mask_irq(desc);
		goto out;
	}

	kstat_incr_irqs_this_cpu(desc);
	if (desc->istate & IRQS_ONESHOT)
		mask_irq(desc);

	preflow_handler(desc);
	handle_irq_event(desc);

	cond_unmask_eoi_irq(desc, chip);

	raw_spin_unlock(&desc->lock);
	return;
out:
	if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
		chip->irq_eoi(&desc->irq_data);
	raw_spin_unlock(&desc->lock);
}
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EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);

#endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */

/**
 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
 * NULL)
 * @data:       Pointer to interrupt specific data
 */


void irq_chip_enable_parent(struct irq_data *data)
{
	data = data->parent_data;
	if (data->chip->irq_enable)
		data->chip->irq_enable(data);
	else
		data->chip->irq_unmask(data);
}
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EXPORT_SYMBOL_GPL(irq_chip_enable_parent);

/**
 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
 * NULL)
 * @data:       Pointer to interrupt specific data
 */


void irq_chip_disable_parent(struct irq_data *data)
{
	data = data->parent_data;
	if (data->chip->irq_disable)
		data->chip->irq_disable(data);
	else
		data->chip->irq_mask(data);
}
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EXPORT_SYMBOL_GPL(irq_chip_disable_parent);

/**
 * irq_chip_ack_parent - Acknowledge the parent interrupt
 * @data:       Pointer to interrupt specific data
 */


void irq_chip_ack_parent(struct irq_data *data)
{
	data = data->parent_data;
	data->chip->irq_ack(data);
}
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EXPORT_SYMBOL_GPL(irq_chip_ack_parent);

/**
 * irq_chip_mask_parent - Mask the parent interrupt
 * @data:       Pointer to interrupt specific data
 */


void irq_chip_mask_parent(struct irq_data *data)
{
	data = data->parent_data;
	data->chip->irq_mask(data);
}
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EXPORT_SYMBOL_GPL(irq_chip_mask_parent);

/**
 * irq_chip_unmask_parent - Unmask the parent interrupt
 * @data:       Pointer to interrupt specific data
 */


void irq_chip_unmask_parent(struct irq_data *data)
{
	data = data->parent_data;
	data->chip->irq_unmask(data);
}
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EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);

/**
 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
 * @data:       Pointer to interrupt specific data
 */


void irq_chip_eoi_parent(struct irq_data *data)
{
	data = data->parent_data;
	data->chip->irq_eoi(data);
}
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EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);

/**
 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
 * @data:       Pointer to interrupt specific data
 * @dest:       The affinity mask to set
 * @force:      Flag to enforce setting (disable online checks)
 *
 * Conditinal, as the underlying parent chip might not implement it.
 */


int irq_chip_set_affinity_parent(struct irq_data *data,
				 const struct cpumask *dest, bool force)
{
	data = data->parent_data;
	if (data->chip->irq_set_affinity)
		return data->chip->irq_set_affinity(data, dest, force);

	return -ENOSYS;
}
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EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);

/**
 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
 * @data:       Pointer to interrupt specific data
 * @type:       IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
 *
 * Conditional, as the underlying parent chip might not implement it.
 */


int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
{
	data = data->parent_data;

	if (data->chip->irq_set_type)
		return data->chip->irq_set_type(data, type);

	return -ENOSYS;
}
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EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);

/**
 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
 * @data:       Pointer to interrupt specific data
 *
 * Iterate through the domain hierarchy of the interrupt and check
 * whether a hw retrigger function exists. If yes, invoke it.
 */


int irq_chip_retrigger_hierarchy(struct irq_data *data)
{
	for (data = data->parent_data; data; data = data->parent_data)
		if (data->chip && data->chip->irq_retrigger)
			return data->chip->irq_retrigger(data);

	return 0;
}

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/**
 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
 * @data:       Pointer to interrupt specific data
 * @vcpu_info:  The vcpu affinity information
 */


int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
{
	data = data->parent_data;
	if (data->chip->irq_set_vcpu_affinity)
		return data->chip->irq_set_vcpu_affinity(data, vcpu_info);

	return -ENOSYS;
}

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/**
 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
 * @data:       Pointer to interrupt specific data
 * @on:         Whether to set or reset the wake-up capability of this irq
 *
 * Conditional, as the underlying parent chip might not implement it.
 */


int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
{
	data = data->parent_data;
	if (data->chip->irq_set_wake)
		return data->chip->irq_set_wake(data, on);

	return -ENOSYS;
}
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#endif

/**
 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
 * @data:       Pointer to interrupt specific data
 * @msg:        Pointer to the MSI message
 *
 * For hierarchical domains we find the first chip in the hierarchy
 * which implements the irq_compose_msi_msg callback. For non
 * hierarchical we use the top level chip.
 */


int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
	struct irq_data *pos = NULL;

#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
	for (; data; data = data->parent_data)
#endif
		if (data->chip && data->chip->irq_compose_msi_msg)
			pos = data;
	if (!pos)
		return -ENOSYS;

	pos->chip->irq_compose_msi_msg(pos, msg);

	return 0;
}

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/**
 * irq_chip_pm_get - Enable power for an IRQ chip
 * @data:       Pointer to interrupt specific data
 *
 * Enable the power to the IRQ chip referenced by the interrupt data
 * structure.
 */


int irq_chip_pm_get(struct irq_data *data)
{
	int retval;

	if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
		retval = pm_runtime_get_sync(data->chip->parent_device);
		if (retval < 0) {
			pm_runtime_put_noidle(data->chip->parent_device);
			return retval;
		}
	}

	return 0;
}

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/**
 * irq_chip_pm_put - Disable power for an IRQ chip
 * @data:       Pointer to interrupt specific data
 *
 * Disable the power to the IRQ chip referenced by the interrupt data
 * structure, belongs. Note that power will only be disabled, once this
 * function has been called for all IRQs that have called irq_chip_pm_get().
 */


int irq_chip_pm_put(struct irq_data *data)
{
	int retval = 0;

	if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
		retval = pm_runtime_put(data->chip->parent_device);

	return (retval < 0) ? retval : 0;
}
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