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
pci_note_irq_problem(struct pci_dev * pdev,const char * reason)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 */
pci_lost_interrupt(struct pci_dev * pdev)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