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| author | Yijing Wang <wangyijing@huawei.com> | 2012-07-24 17:20:02 +0800 |
|---|---|---|
| committer | Jiang Liu <liuj97@gmail.com> | 2012-08-20 22:32:20 +0800 |
| commit | 786e22885d9959fda0473ace5a61cb11620fba9b (patch) | |
| tree | bfd70885b7d52deaef338ee212bf66ac682f8e42 /include/linux/pci.h | |
| parent | 0d7614f09c1ebdbaa1599a5aba7593f147bf96ee (diff) | |
| download | lwn-786e22885d9959fda0473ace5a61cb11620fba9b.tar.gz lwn-786e22885d9959fda0473ace5a61cb11620fba9b.zip | |
PCI: Add pcie_flags_reg to cache PCIe capabilities register
Since PCI Express Capabilities Register is read only, cache its value
into struct pci_dev to avoid repeatedly calling pci_read_config_*().
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 5faa8310eec9..95662b2f0c3d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -258,6 +258,7 @@ struct pci_dev { u8 pcie_mpss:3; /* PCI-E Max Payload Size Supported */ u8 rom_base_reg; /* which config register controls the ROM */ u8 pin; /* which interrupt pin this device uses */ + u16 pcie_flags_reg; /* cached PCI-E Capabilities Register */ struct pci_driver *driver; /* which driver has allocated this device */ u64 dma_mask; /* Mask of the bits of bus address this @@ -1650,6 +1651,15 @@ static inline bool pci_is_pcie(struct pci_dev *dev) return !!pci_pcie_cap(dev); } +/** + * pci_pcie_type - get the PCIe device/port type + * @dev: PCI device + */ +static inline int pci_pcie_type(const struct pci_dev *dev) +{ + return (dev->pcie_flags_reg & PCI_EXP_FLAGS_TYPE) >> 4; +} + void pci_request_acs(void); bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags); bool pci_acs_path_enabled(struct pci_dev *start, |