centos man page for pci_pcie_cap

PCI_PCIE_CAP(9) 						Hardware Interfaces						   PCI_PCIE_CAP(9)

NAME
       pci_pcie_cap - get the saved PCIe capability offset

SYNOPSIS
       int pci_pcie_cap(struct pci_dev * dev);

ARGUMENTS
       dev
	   PCI device

DESCRIPTION
       PCIe capability offset is calculated at PCI device initialization time and saved in the data structure. This function returns saved PCIe
       capability offset. Using this instead of pci_find_capability reduces unnecessary search in the PCI configuration space. If you need to
       calculate PCIe capability offset from raw device for some reasons, please use pci_find_capability instead.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							   PCI_PCIE_CAP(9)