diff options
| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2009-11-11 05:29:54 (GMT) |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-11-24 23:25:11 (GMT) |
| commit | d7b7e60526d54da4c94afe5f137714cee7d05c41 (patch) | |
| tree | e8cdf8d2e60c274848e860501234ebb958ab0ae9 | |
| parent | 8c8def26bfaa704db67d515da3eb92cf26067548 (diff) | |
| download | linux-d7b7e60526d54da4c94afe5f137714cee7d05c41.tar.xz | |
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>
| -rw-r--r-- | include/linux/pci.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 233b3a0..15f37f1 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -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 */ |