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Commit d7b7e605 authored by Kenji Kaneshige's avatar Kenji Kaneshige Committed by Jesse Barnes
Browse files

PCI: introduce pci_pcie_cap() 



Introduce pci_pcie_cap() API that returns saved PCIe capability offset
(currently it is saved in 'pcie_cap' field in the struct PCI dev).
Using pci_pcie_cap() instead of pci_find_capability() avoids
unnecessary search in PCI configuration space.

Signed-off-by: default avatarKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 8c8def26

include/linux/pci.h

+16 −0
Original line number Diff line number Diff line
@@ -1301,5 +1301,21 @@ extern void pci_hp_create_module_link(struct pci_slot *pci_slot); 
extern void pci_hp_remove_module_link(struct pci_slot *pci_slot);

#endif



/**

 * pci_pcie_cap - get the saved PCIe capability offset

 * @dev: PCI device

 *

 * 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.

 */

static inline int pci_pcie_cap(struct pci_dev *dev)

{

	return dev->pcie_cap;

}



#endif /* __KERNEL__ */

#endif /* LINUX_PCI_H */