/* * 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)\n", parent->dev.bus_id, parent->vendor, parent->device); dev_printk(KERN_ERR, &pdev->dev, "%s\n", reason); dev_printk(KERN_ERR, &pdev->dev, "Please report to linux-kernel@vger.kernel.org\n"); 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);