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