PCI: add routines for debugging and handling lost interrupts

We're getting a lot of storage drivers blamed for interrupt misrouting
issues.  This patch provides a standard way of reporting the problem
... and, if possible, correcting it.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 752def8a2ef4..c75b82bda327 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -546,6 +546,13 @@ struct pci_dev __deprecated *pci_find_slot(unsigned int bus,
                                            unsigned int devfn);
 #endif /* CONFIG_PCI_LEGACY */
 
+enum pci_lost_interrupt_reason {
+        PCI_LOST_IRQ_NO_INFORMATION = 0,
+        PCI_LOST_IRQ_DISABLE_MSI,
+        PCI_LOST_IRQ_DISABLE_MSIX,
+        PCI_LOST_IRQ_DISABLE_ACPI,
+};
+enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *dev);
 int pci_find_capability(struct pci_dev *dev, int cap);
 int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap);
 int pci_find_ext_capability(struct pci_dev *dev, int cap);