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/export.h> 11 #include <linux/pci.h> 12 13 static void pci_note_irq_problem(struct pci_dev *pdev, const char *reason) 14 { 15 struct pci_dev *parent = to_pci_dev(pdev->dev.parent); 16 17 dev_err(&pdev->dev, 18 "Potentially misrouted IRQ (Bridge %s %04x:%04x)\n", 19 dev_name(&parent->dev), parent->vendor, parent->device); 20 dev_err(&pdev->dev, "%s\n", reason); 21 dev_err(&pdev->dev, "Please report to linux-kernel@vger.kernel.org\n"); 22 WARN_ON(1); 23 } 24 25 /** 26 * pci_lost_interrupt - reports a lost PCI interrupt 27 * @pdev: device whose interrupt is lost 28 * 29 * The primary function of this routine is to report a lost interrupt 30 * in a standard way which users can recognise (instead of blaming the 31 * driver). 32 * 33 * Returns: 34 * a suggestion for fixing it (although the driver is not required to 35 * act on this). 36 */ 37 enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev) 38 { 39 if (pdev->msi_enabled || pdev->msix_enabled) { 40 enum pci_lost_interrupt_reason ret; 41 42 if (pdev->msix_enabled) { 43 pci_note_irq_problem(pdev, "MSIX routing failure"); 44 ret = PCI_LOST_IRQ_DISABLE_MSIX; 45 } else { 46 pci_note_irq_problem(pdev, "MSI routing failure"); 47 ret = PCI_LOST_IRQ_DISABLE_MSI; 48 } 49 return ret; 50 } 51 #ifdef CONFIG_ACPI 52 if (!(acpi_disabled || acpi_noirq)) { 53 pci_note_irq_problem(pdev, "Potential ACPI misrouting please reboot with acpi=noirq"); 54 /* currently no way to fix acpi on the fly */ 55 return PCI_LOST_IRQ_DISABLE_ACPI; 56 } 57 #endif 58 pci_note_irq_problem(pdev, "unknown cause (not MSI or ACPI)"); 59 return PCI_LOST_IRQ_NO_INFORMATION; 60 } 61 EXPORT_SYMBOL(pci_lost_interrupt); 62