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Release 4.15 kernel/irq/migration.c

Directory: kernel/irq
// SPDX-License-Identifier: GPL-2.0

#include <linux/irq.h>
#include <linux/interrupt.h>

#include "internals.h"

 * irq_fixup_move_pending - Cleanup irq move pending from a dying CPU
 * @desc:               Interrupt descpriptor to clean up
 * @force_clear:        If set clear the move pending bit unconditionally.
 *                      If not set, clear it only when the dying CPU is the
 *                      last one in the pending mask.
 * Returns true if the pending bit was set and the pending mask contains an
 * online CPU other than the dying CPU.

bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear) { struct irq_data *data = irq_desc_get_irq_data(desc); if (!irqd_is_setaffinity_pending(data)) return false; /* * The outgoing CPU might be the last online target in a pending * interrupt move. If that's the case clear the pending move bit. */ if (cpumask_any_and(desc->pending_mask, cpu_online_mask) >= nr_cpu_ids) { irqd_clr_move_pending(data); return false; } if (force_clear) irqd_clr_move_pending(data); return true; }


Thomas Gleixner70100.00%1100.00%

void irq_move_masked_irq(struct irq_data *idata) { struct irq_desc *desc = irq_data_to_desc(idata); struct irq_chip *chip = desc->irq_data.chip; if (likely(!irqd_is_setaffinity_pending(&desc->irq_data))) return; irqd_clr_move_pending(&desc->irq_data); /* * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. */ if (irqd_is_per_cpu(&desc->irq_data)) { WARN_ON(1); return; } if (unlikely(cpumask_empty(desc->pending_mask))) return; if (!chip->irq_set_affinity) return; assert_raw_spin_locked(&desc->lock); /* * If there was a valid mask to work with, please * do the disable, re-program, enable sequence. * This is *not* particularly important for level triggered * but in a edge trigger case, we might be setting rte * when an active trigger is coming in. This could * cause some ioapics to mal-function. * Being paranoid i guess! * * For correct operation this depends on the caller * masking the irqs. */ if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids) irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false); cpumask_clear(desc->pending_mask); }


Thomas Gleixner4129.93%631.58%
Andrew Morton3727.01%15.26%
Bryan Holty2115.33%15.26%
Yinghai Lu128.76%210.53%
Rusty Russell118.03%15.26%
Eric W. Biedermann53.65%15.26%
Jiang Liu42.92%210.53%
Ingo Molnar42.92%315.79%
Lucas De Marchi10.73%15.26%
Daniel Walker10.73%15.26%

void irq_move_irq(struct irq_data *idata) { bool masked; /* * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled, * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here. */ idata = irq_desc_get_irq_data(irq_data_to_desc(idata)); if (likely(!irqd_is_setaffinity_pending(idata))) return; if (unlikely(irqd_irq_disabled(idata))) return; /* * Be careful vs. already masked interrupts. If this is a * threaded interrupt with ONESHOT set, we can end up with an * interrupt storm. */ masked = irqd_irq_masked(idata); if (!masked) idata->chip->irq_mask(idata); irq_move_masked_irq(idata); if (!masked) idata->chip->irq_unmask(idata); }


Thomas Gleixner4955.68%650.00%
Jiang Liu1112.50%18.33%
Andrew Morton1112.50%18.33%
Eric W. Biedermann1011.36%216.67%
Bryan Holty55.68%18.33%
Ingo Molnar22.27%18.33%

Overall Contributors

Thomas Gleixner16152.61%1142.31%
Andrew Morton5116.67%13.85%
Bryan Holty268.50%13.85%
Yinghai Lu185.88%27.69%
Eric W. Biedermann154.90%27.69%
Jiang Liu154.90%27.69%
Rusty Russell113.59%13.85%
Ingo Molnar61.96%311.54%
Daniel Walker10.33%13.85%
Greg Kroah-Hartman10.33%13.85%
Lucas De Marchi10.33%13.85%
Directory: kernel/irq
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