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| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2009-11-05 12:05:11 +0900 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-11-06 13:59:02 -0800 |
| commit | 0efea0006335a2425b1a12a2ad35efad626fe353 (patch) | |
| tree | d139b06a32665ec1227c06f1c0a14b21e3c0d654 | |
| parent | 1e5ad9679016275d422e36b12a98b0927d76f556 (diff) | |
| download | lwn-0efea0006335a2425b1a12a2ad35efad626fe353.tar.gz lwn-0efea0006335a2425b1a12a2ad35efad626fe353.zip | |
PCI: cache PCIe capability offset
There are a lot of codes that searches PCI express capability offset
in the PCI configuration space using pci_find_capability(). Caching it
in the struct pci_dev will reduce unncecessary search. This patch adds
an additional 'pcie_cap' fields into struct pci_dev, which is
initialized at pci device scan time (in set_pcie_port_type()).
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
| -rw-r--r-- | drivers/pci/probe.c | 1 | ||||
| -rw-r--r-- | include/linux/pci.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 623086f9ba84..54b9f1501487 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -692,6 +692,7 @@ static void set_pcie_port_type(struct pci_dev *pdev) if (!pos) return; pdev->is_pcie = 1; + pdev->pcie_cap = pos; pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; } diff --git a/include/linux/pci.h b/include/linux/pci.h index 86c31ac454d1..233b3a092035 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -218,6 +218,7 @@ struct pci_dev { unsigned int class; /* 3 bytes: (base,sub,prog-if) */ u8 revision; /* PCI revision, low byte of class word */ u8 hdr_type; /* PCI header type (`multi' flag masked out) */ + u8 pcie_cap; /* PCI-E capability offset */ u8 pcie_type; /* PCI-E device/port type */ u8 rom_base_reg; /* which config register controls the ROM */ u8 pin; /* which interrupt pin this device uses */ |