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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/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_printk(KERN_ERR, &pdev->dev, |
| 18 | "Potentially misrouted IRQ (Bridge %s %04x:%04x)\n", |
| 19 | dev_name(&parent->dev), parent->vendor, parent->device); |
| 20 | dev_printk(KERN_ERR, &pdev->dev, "%s\n", reason); |
| 21 | dev_printk(KERN_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 |
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