PCI: add a new function to map BAR offsets

Add a function to map a given resource number to a corresponding
register so drivers can get the offset and type of device specific BARs.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index d881fde8bb82..c4f4a1e6ea28 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -171,6 +171,8 @@ enum pci_bar_type {
 
 extern int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                                 struct resource *res, unsigned int reg);
+extern int pci_resource_bar(struct pci_dev *dev, int resno,
+                            enum pci_bar_type *type);
 extern void pci_enable_ari(struct pci_dev *dev);
 /**
  * pci_ari_enabled - query ARI forwarding status