irq.c

Go to the documentation of this file.

/*
 * PCI IRQ failure handing code
 *
 * Copyright (c) 2008 James Bottomley <[email protected]>
 */

#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/export.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)\n",
           dev_name(&parent->dev), parent->vendor, parent->device);
    dev_printk(KERN_ERR, &pdev->dev, "%s\n", reason);
    dev_printk(KERN_ERR, &pdev->dev, "Please report to [email protected]\n");
    WARN_ON(1);
}

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);