projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 388c8c16 JB |
1 | /* |
| 2 | * PCI IRQ failure handing code | |
| 3 | * | |
| 4 | * Copyright (c) 2008 James Bottomley <[email protected]> | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/acpi.h> | |
| 8 | #include <linux/device.h> | |
| 9 | #include <linux/kernel.h> | |
| 363c75db | 10 | #include <linux/export.h> |
| 388c8c16 JB |
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 | ||
| 438be3c6 JP |
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 [email protected]\n"); | |
| 388c8c16 JB |
22 | WARN_ON(1); |
| 23 | } | |
| 24 | ||
| 25 | /** | |
| 26 | * pci_lost_interrupt - reports a lost PCI interrupt | |
| 27 | * @pdev: device whose interrupt is lost | |
| f7625980 | 28 | * |
| 388c8c16 JB |
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); |