/*
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* PCI IRQ failure handing code
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*
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* Copyright (c) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/pci.h>
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static void pci_note_irq_problem(struct pci_dev *pdev, const char *reason)
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{
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struct pci_dev *parent = to_pci_dev(pdev->dev.parent);
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dev_err(&pdev->dev,
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"Potentially misrouted IRQ (Bridge %s %04x:%04x)\n",
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dev_name(&parent->dev), parent->vendor, parent->device);
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dev_err(&pdev->dev, "%s\n", reason);
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dev_err(&pdev->dev, "Please report to linux-kernel@vger.kernel.org\n");
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WARN_ON(1);
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}
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/**
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* pci_lost_interrupt - reports a lost PCI interrupt
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* @pdev: device whose interrupt is lost
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*
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* The primary function of this routine is to report a lost interrupt
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* in a standard way which users can recognise (instead of blaming the
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* driver).
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*
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* Returns:
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* a suggestion for fixing it (although the driver is not required to
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* act on this).
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*/
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enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev)
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{
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if (pdev->msi_enabled || pdev->msix_enabled) {
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enum pci_lost_interrupt_reason ret;
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if (pdev->msix_enabled) {
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pci_note_irq_problem(pdev, "MSIX routing failure");
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ret = PCI_LOST_IRQ_DISABLE_MSIX;
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} else {
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pci_note_irq_problem(pdev, "MSI routing failure");
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ret = PCI_LOST_IRQ_DISABLE_MSI;
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}
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return ret;
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}
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#ifdef CONFIG_ACPI
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if (!(acpi_disabled || acpi_noirq)) {
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pci_note_irq_problem(pdev, "Potential ACPI misrouting please reboot with acpi=noirq");
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/* currently no way to fix acpi on the fly */
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return PCI_LOST_IRQ_DISABLE_ACPI;
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}
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#endif
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pci_note_irq_problem(pdev, "unknown cause (not MSI or ACPI)");
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return PCI_LOST_IRQ_NO_INFORMATION;
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}
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EXPORT_SYMBOL(pci_lost_interrupt);
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