111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include "internals.h"
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/**
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* irq_fixup_move_pending - Cleanup irq move pending from a dying CPU
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* @desc: Interrupt descpriptor to clean up
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* @force_clear: If set clear the move pending bit unconditionally.
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* If not set, clear it only when the dying CPU is the
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* last one in the pending mask.
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*
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* Returns true if the pending bit was set and the pending mask contains an
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* online CPU other than the dying CPU.
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*/
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bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear)
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{
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struct irq_data *data = irq_desc_get_irq_data(desc);
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if (!irqd_is_setaffinity_pending(data))
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return false;
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/*
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* The outgoing CPU might be the last online target in a pending
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* interrupt move. If that's the case clear the pending move bit.
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*/
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if (cpumask_any_and(desc->pending_mask, cpu_online_mask) >= nr_cpu_ids) {
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irqd_clr_move_pending(data);
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return false;
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}
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if (force_clear)
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irqd_clr_move_pending(data);
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return true;
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}
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void irq_move_masked_irq(struct irq_data *idata)
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{
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struct irq_desc *desc = irq_data_to_desc(idata);
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struct irq_chip *chip = desc->irq_data.chip;
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if (likely(!irqd_is_setaffinity_pending(&desc->irq_data)))
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return;
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irqd_clr_move_pending(&desc->irq_data);
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/*
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* Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
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*/
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if (irqd_is_per_cpu(&desc->irq_data)) {
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WARN_ON(1);
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return;
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}
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if (unlikely(cpumask_empty(desc->pending_mask)))
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return;
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if (!chip->irq_set_affinity)
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return;
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assert_raw_spin_locked(&desc->lock);
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/*
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* If there was a valid mask to work with, please
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* do the disable, re-program, enable sequence.
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* This is *not* particularly important for level triggered
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* but in a edge trigger case, we might be setting rte
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* when an active trigger is coming in. This could
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* cause some ioapics to mal-function.
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* Being paranoid i guess!
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*
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* For correct operation this depends on the caller
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* masking the irqs.
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*/
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if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids)
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irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);
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cpumask_clear(desc->pending_mask);
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}
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void irq_move_irq(struct irq_data *idata)
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{
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bool masked;
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/*
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* Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled,
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* and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is
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* disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here.
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*/
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idata = irq_desc_get_irq_data(irq_data_to_desc(idata));
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if (likely(!irqd_is_setaffinity_pending(idata)))
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return;
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if (unlikely(irqd_irq_disabled(idata)))
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return;
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/*
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* Be careful vs. already masked interrupts. If this is a
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* threaded interrupt with ONESHOT set, we can end up with an
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* interrupt storm.
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*/
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masked = irqd_irq_masked(idata);
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if (!masked)
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idata->chip->irq_mask(idata);
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irq_move_masked_irq(idata);
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if (!masked)
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idata->chip->irq_unmask(idata);
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}
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