linux/drivers/pci/irq.c
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   1/*
   2 * PCI IRQ failure handing code
   3 *
   4 * Copyright (c) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
   5 */
   6
   7#include <linux/acpi.h>
   8#include <linux/device.h>
   9#include <linux/kernel.h>
  10#include <linux/pci.h>
  11
  12static void pci_note_irq_problem(struct pci_dev *pdev, const char *reason)
  13{
  14        struct pci_dev *parent = to_pci_dev(pdev->dev.parent);
  15
  16        dev_printk(KERN_ERR, &pdev->dev,
  17                   "Potentially misrouted IRQ (Bridge %s %04x:%04x)\n",
  18                   dev_name(&parent->dev), parent->vendor, parent->device);
  19        dev_printk(KERN_ERR, &pdev->dev, "%s\n", reason);
  20        dev_printk(KERN_ERR, &pdev->dev, "Please report to linux-kernel@vger.kernel.org\n");
  21        WARN_ON(1);
  22}
  23
  24/**
  25 * pci_lost_interrupt - reports a lost PCI interrupt
  26 * @pdev:       device whose interrupt is lost
  27 * 
  28 * The primary function of this routine is to report a lost interrupt
  29 * in a standard way which users can recognise (instead of blaming the
  30 * driver).
  31 *
  32 * Returns:
  33 *  a suggestion for fixing it (although the driver is not required to
  34 * act on this).
  35 */
  36enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev)
  37{
  38        if (pdev->msi_enabled || pdev->msix_enabled) {
  39                enum pci_lost_interrupt_reason ret;
  40
  41                if (pdev->msix_enabled) {
  42                        pci_note_irq_problem(pdev, "MSIX routing failure");
  43                        ret = PCI_LOST_IRQ_DISABLE_MSIX;
  44                } else {
  45                        pci_note_irq_problem(pdev, "MSI routing failure");
  46                        ret = PCI_LOST_IRQ_DISABLE_MSI;
  47                }
  48                return ret;
  49        }
  50#ifdef CONFIG_ACPI
  51        if (!(acpi_disabled || acpi_noirq)) {
  52                pci_note_irq_problem(pdev, "Potential ACPI misrouting please reboot with acpi=noirq");
  53                /* currently no way to fix acpi on the fly */
  54                return PCI_LOST_IRQ_DISABLE_ACPI;
  55        }
  56#endif
  57        pci_note_irq_problem(pdev, "unknown cause (not MSI or ACPI)");
  58        return PCI_LOST_IRQ_NO_INFORMATION;
  59}
  60EXPORT_SYMBOL(pci_lost_interrupt);
  61
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