/*
   * PCI IRQ failure handing code
   *
   * Copyright (c) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
   */
  
  #include <linux/acpi.h>
  #include <linux/device.h>
  #include <linux/kernel.h>
  #include <linux/pci.h>
  
  static void pci_note_irq_problem(struct pci_dev *pdev, const char *reason)
  {
  	struct pci_dev *parent = to_pci_dev(pdev->dev.parent);
  
  	dev_printk(KERN_ERR, &pdev->dev,
  		   "Potentially misrouted IRQ (Bridge %s %04x:%04x)
  ",

  		   dev_name(&parent->dev), parent->vendor, parent->device);

  	dev_printk(KERN_ERR, &pdev->dev, "%s
  ", reason);
  	dev_printk(KERN_ERR, &pdev->dev, "Please report to linux-kernel@vger.kernel.org
  ");
  	WARN_ON(1);
  }
  
  /**
   * pci_lost_interrupt - reports a lost PCI interrupt
   * @pdev:	device whose interrupt is lost
   * 
   * The primary function of this routine is to report a lost interrupt
   * in a standard way which users can recognise (instead of blaming the
   * driver).
   *
   * Returns:
   *  a suggestion for fixing it (although the driver is not required to
   * act on this).
   */
  enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev)
  {
  	if (pdev->msi_enabled || pdev->msix_enabled) {
  		enum pci_lost_interrupt_reason ret;
  
  		if (pdev->msix_enabled) {
  			pci_note_irq_problem(pdev, "MSIX routing failure");
  			ret = PCI_LOST_IRQ_DISABLE_MSIX;
  		} else {
  			pci_note_irq_problem(pdev, "MSI routing failure");
  			ret = PCI_LOST_IRQ_DISABLE_MSI;
  		}
  		return ret;
  	}
  #ifdef CONFIG_ACPI
  	if (!(acpi_disabled || acpi_noirq)) {
  		pci_note_irq_problem(pdev, "Potential ACPI misrouting please reboot with acpi=noirq");
  		/* currently no way to fix acpi on the fly */
  		return PCI_LOST_IRQ_DISABLE_ACPI;
  	}
  #endif
  	pci_note_irq_problem(pdev, "unknown cause (not MSI or ACPI)");
  	return PCI_LOST_IRQ_NO_INFORMATION;
  }
  EXPORT_SYMBOL(pci_lost_interrupt);