/* * linux/kernel/irq/autoprobe.c * * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar * * This file contains the interrupt probing code and driver APIs. */ #include #include #include #include #include #include "internals.h" /* * Autodetection depends on the fact that any interrupt that * comes in on to an unassigned handler will get stuck with * "IRQS_WAITING" cleared and the interrupt disabled. */ static DEFINE_MUTEX(probing_active); /** * probe_irq_on - begin an interrupt autodetect * * Commence probing for an interrupt. The interrupts are scanned * and a mask of potential interrupt lines is returned. * */ unsigned long probe_irq_on(void) { struct irq_desc *desc; unsigned long mask = 0; int i; /* * quiesce the kernel, or at least the asynchronous portion */ async_synchronize_full(); mutex_lock(&probing_active); /* * something may have generated an irq long ago and we want to * flush such a longstanding irq before considering it as spurious. */ for_each_irq_desc_reverse(i, desc) { raw_spin_lock_irq(&desc->lock); if (!desc->action && irq_settings_can_probe(desc)) { /* * Some chips need to know about probing in * progress: */ if (desc->irq_data.chip->irq_set_type) desc->irq_data.chip->irq_set_type(&desc->irq_data, IRQ_TYPE_PROBE); irq_startup(desc, false); } raw_spin_unlock_irq(&desc->lock); } /* Wait for longstanding interrupts to trigger. */ msleep(20); /* * enable any unassigned irqs * (we must startup again here because if a longstanding irq * happened in the previous stage, it may have masked itself) */ for_each_irq_desc_reverse(i, desc) { raw_spin_lock_irq(&desc->lock); if (!desc->action && irq_settings_can_probe(desc)) { desc->istate |= IRQS_AUTODETECT | IRQS_WAITING; if (irq_startup(desc, false)) desc->istate |= IRQS_PENDING; } raw_spin_unlock_irq(&desc->lock); } /* * Wait for spurious interrupts to trigger */ msleep(100); /* * Now filter out any obviously spurious interrupts */ for_each_irq_desc(i, desc) { raw_spin_lock_irq(&desc->lock); if (desc->istate & IRQS_AUTODETECT) { /* It triggered already - consider it spurious. */ if (!(desc->istate & IRQS_WAITING)) { desc->istate &= ~IRQS_AUTODETECT; irq_shutdown(desc); } else if (i < 32) mask |= 1 << i; } raw_spin_unlock_irq(&desc->lock); } return mask; } EXPORT_SYMBOL(probe_irq_on); /** * probe_irq_mask - scan a bitmap of interrupt lines * @val: mask of interrupts to consider * * Scan the interrupt lines and return a bitmap of active * autodetect interrupts. The interrupt probe logic state * is then returned to its previous value. * * Note: we need to scan all the irq's even though we will * only return autodetect irq numbers - just so that we reset * them all to a known state. */ unsigned int probe_irq_mask(unsigned long val) { unsigned int mask = 0; struct irq_desc *desc; int i; for_each_irq_desc(i, desc) { raw_spin_lock_irq(&desc->lock); if (desc->istate & IRQS_AUTODETECT) { if (i < 16 && !(desc->istate & IRQS_WAITING)) mask |= 1 << i; desc->istate &= ~IRQS_AUTODETECT; irq_shutdown(desc); } raw_spin_unlock_irq(&desc->lock); } mutex_unlock(&probing_active); return mask & val; } EXPORT_SYMBOL(probe_irq_mask); /** * probe_irq_off - end an interrupt autodetect * @val: mask of potential interrupts (unused) * * Scans the unused interrupt lines and returns the line which * appears to have triggered the interrupt. If no interrupt was * found then zero is returned. If more than one interrupt is * found then minus the first candidate is returned to indicate * their is doubt. * * The interrupt probe logic state is returned to its previous * value. * * BUGS: When used in a module (which arguably shouldn't happen) * nothing prevents two IRQ probe callers from overlapping. The * results of this are non-optimal. */ int probe_irq_off(unsigned long val) { int i, irq_found = 0, nr_of_irqs = 0; struct irq_desc *desc; for_each_irq_desc(i, desc) { raw_spin_lock_irq(&desc->lock); if (desc->istate & IRQS_AUTODETECT) { if (!(desc->istate & IRQS_WAITING)) { if (!nr_of_irqs) irq_found = i; nr_of_irqs++; } desc->istate &= ~IRQS_AUTODETECT; irq_shutdown(desc); } raw_spin_unlock_irq(&desc->lock); } mutex_unlock(&probing_active); if (nr_of_irqs > 1) irq_found = -irq_found; return irq_found; } EXPORT_SYMBOL(probe_irq_off); 'reload'/>
authorKeith Busch <keith.busch@intel.com>2017-01-18 17:21:15 -0500
committerJens Axboe <axboe@fb.com>2017-01-18 15:14:15 -0700
commit88a7503376f4f3bf303c809d1a389739e1205614 (patch)
tree5004e4c61099074e7832ec38e88d258275c152f2 /include/xen/interface/nmi.h
parentfa19a769f82fb9a5ca000b83cacd13fcaeda51ac (diff)
blk-mq: Remove unused variable
Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/xen/interface/nmi.h')