On Thu, Nov 05, 2009 at 12:05:11PM +0900, Kenji Kaneshige wrote:
> 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()).
I think adding this should imply the removal of ->is_pcie. pcie_cap == 0
means !is_pcie.
> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
>
> ---
> drivers/pci/probe.c | 1 +
> include/linux/pci.h | 1 +
> 2 files changed, 2 insertions(+)
>
> Index: 20090825/drivers/pci/probe.c
> ===================================================================
> --- 20090825.orig/drivers/pci/probe.c
> +++ 20090825/drivers/pci/probe.c
> @@ -693,6 +693,7 @@ static void set_pcie_port_type(struct pc
> 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;
> }
> Index: 20090825/include/linux/pci.h
> ===================================================================
> --- 20090825.orig/include/linux/pci.h
> +++ 20090825/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 */
>
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--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
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