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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: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@ -1301,5 +1301,21 @@ extern void pci_hp_create_module_link(struct pci_slot *pci_slot);
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extern void pci_hp_remove_module_link(struct pci_slot *pci_slot);
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#endif
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/**
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* pci_pcie_cap - get the saved PCIe capability offset
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* @dev: PCI device
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*
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* PCIe capability offset is calculated at PCI device initialization
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* time and saved in the data structure. This function returns saved
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* PCIe capability offset. Using this instead of pci_find_capability()
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* reduces unnecessary search in the PCI configuration space. If you
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* need to calculate PCIe capability offset from raw device for some
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* reasons, please use pci_find_capability() instead.
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*/
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static inline int pci_pcie_cap(struct pci_dev *dev)
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{
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return dev->pcie_cap;
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}
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#endif /* __KERNEL__ */
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#endif /* LINUX_PCI_H */
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