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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 |
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