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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>
This commit is contained in:
Kenji Kaneshige 2009-11-05 12:05:11 +09:00 committed by Jesse Barnes
parent 1e5ad96790
commit 0efea00063
2 changed files with 2 additions and 0 deletions
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1
drivers/pci/probe.c
View File

@ -692,6 +692,7 @@ static void set_pcie_port_type(struct pci_dev *pdev)
if (!pos) if (!pos)
return; return;
pdev->is_pcie = 1; pdev->is_pcie = 1;
pdev->pcie_cap = pos;
pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16); pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
} }

1
include/linux/pci.h
View File

@ -218,6 +218,7 @@ struct pci_dev {
unsigned int class; /* 3 bytes: (base,sub,prog-if) */ unsigned int class; /* 3 bytes: (base,sub,prog-if) */
u8 revision; /* PCI revision, low byte of class word */ u8 revision; /* PCI revision, low byte of class word */
u8 hdr_type; /* PCI header type (`multi' flag masked out) */ 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 pcie_type; /* PCI-E device/port type */
u8 rom_base_reg; /* which config register controls the ROM */ u8 rom_base_reg; /* which config register controls the ROM */
u8 pin; /* which interrupt pin this device uses */ u8 pin; /* which interrupt pin this device uses */