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388c8c16 JB |
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", | |
1a927133 | 18 | dev_name(&parent->dev), parent->vendor, parent->device); |
388c8c16 JB |
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); |