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/export.h>
  11#include <linux/pci.h>
  12
  13static void pci_note_irq_problem(struct pci_dev *pdev, const char *reason)
  14{
  15        struct pci_dev *parent = to_pci_dev(pdev->dev.parent);
  16
  17        dev_err(&pdev->dev,
  18                "Potentially misrouted IRQ (Bridge %s %04x:%04x)\n",
  19                dev_name(&parent->dev), parent->vendor, parent->device);
  20        dev_err(&pdev->dev, "%s\n", reason);
  21        dev_err(&pdev->dev, "Please report to linux-kernel@vger.kernel.org\n");
  22        WARN_ON(1);
  23}
  24
  25/**
  26 * pci_lost_interrupt - reports a lost PCI interrupt
  27 * @pdev:       device whose interrupt is lost
  28 * 
  29 * The primary function of this routine is to report a lost interrupt
  30 * in a standard way which users can recognise (instead of blaming the
  31 * driver).
  32 *
  33 * Returns:
  34 *  a suggestion for fixing it (although the driver is not required to
  35 * act on this).
  36 */
  37enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev)
  38{
  39        if (pdev->msi_enabled || pdev->msix_enabled) {
  40                enum pci_lost_interrupt_reason ret;
  41
  42                if (pdev->msix_enabled) {
  43                        pci_note_irq_problem(pdev, "MSIX routing failure");
  44                        ret = PCI_LOST_IRQ_DISABLE_MSIX;
  45                } else {
  46                        pci_note_irq_problem(pdev, "MSI routing failure");
  47                        ret = PCI_LOST_IRQ_DISABLE_MSI;
  48                }
  49                return ret;
  50        }
  51#ifdef CONFIG_ACPI
  52        if (!(acpi_disabled || acpi_noirq)) {
  53                pci_note_irq_problem(pdev, "Potential ACPI misrouting please reboot with acpi=noirq");
  54                /* currently no way to fix acpi on the fly */
  55                return PCI_LOST_IRQ_DISABLE_ACPI;
  56        }
  57#endif
  58        pci_note_irq_problem(pdev, "unknown cause (not MSI or ACPI)");
  59        return PCI_LOST_IRQ_NO_INFORMATION;
  60}
  61EXPORT_SYMBOL(pci_lost_interrupt);
  62
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