/*
 * Generic cpu hotunplug interrupt migration code copied from the
 * arch/arm implementation
 *
 * Copyright (C) Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/interrupt.h>
#include <linux/ratelimit.h>
#include <linux/irq.h>

#include "internals.h"

static bool migrate_one_irq(struct irq_desc *desc)
{
	struct irq_data *d = irq_desc_get_irq_data(desc);
	const struct cpumask *affinity = d->common->affinity;
	struct irq_chip *c;
	bool ret = false;

	/*
	 * If this is a per-CPU interrupt, or the affinity does not
	 * include this CPU, then we have nothing to do.
	 */
	if (irqd_is_per_cpu(d) ||
	    !cpumask_test_cpu(smp_processor_id(), affinity))
		return false;

	if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
		affinity = cpu_online_mask;
		ret = true;
	}

	c = irq_data_get_irq_chip(d);
	if (!c->irq_set_affinity) {
		pr_debug("IRQ%u: unable to set affinity\n", d->irq);
	} else {
		int r = irq_do_set_affinity(d, affinity, false);
		if (r)
			pr_warn_ratelimited("IRQ%u: set affinity failed(%d).\n",
					    d->irq, r);
	}

	return ret;
}

/**
 * irq_migrate_all_off_this_cpu - Migrate irqs away from offline cpu
 *
 * The current CPU has been marked offline.  Migrate IRQs off this CPU.
 * If the affinity settings do not allow other CPUs, force them onto any
 * available CPU.
 *
 * Note: we must iterate over all IRQs, whether they have an attached
 * action structure or not, as we need to get chained interrupts too.
 */
void irq_migrate_all_off_this_cpu(void)
{
	unsigned int irq;
	struct irq_desc *desc;
	unsigned long flags;

	local_irq_save(flags);

	for_each_active_irq(irq) {
		bool affinity_broken;

		desc = irq_to_desc(irq);
		raw_spin_lock(&desc->lock);
		affinity_broken = migrate_one_irq(desc);
		raw_spin_unlock(&desc->lock);

		if (affinity_broken)
			pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n",
					    irq, smp_processor_id());
	}

	local_irq_restore(flags);
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>host</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/ehci-sysfs.c?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>ehci-sysfs.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Johannes Berg &lt;johannes.berg@intel.com&gt;</td><td class='right'>2017-02-07 10:40:50 +0100</td></tr>
<tr><th>committer</th><td>Johannes Berg &lt;johannes.berg@intel.com&gt;</td><td class='right'>2017-02-07 10:40:50 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/ehci-sysfs.c?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/host/ehci-sysfs.c?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>0021fe481f8acf3694d92d72f3dd1b2a71a20ca3</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host/ehci-sysfs.c?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>drivers/usb/host/ehci-sysfs.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/ehci-sysfs.c?id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>228c8c6b1f4376788e9d5ab00d50b10228eb40d3</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/ehci-sysfs.c?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a&amp;id2=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>diff</a>)</td></tr></table>
<div class='commit-subject'>mac80211: add back lost debugfs files</div><div class='commit-msg'>Somehow these files were never present or lost, but the code
is there and they seem somewhat useful, so add them back.

Signed-off-by: Johannes Berg &lt;johannes.berg@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>Diffstat</a> (limited to 'drivers/usb/host/ehci-sysfs.c')</div><table summary='diffstat' class='diffstat'>