linux-kernel - Re: [PATCH] pci/pcie: Avoid unnecessary PCIe link retrains

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Message-ID: <20091106140028.6242cb94@jbarnes-piketon>
Date:	Fri, 6 Nov 2009 14:00:28 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	Bjorn Helgaas <bjorn.helgaas@...com>, rdh@...t.sun.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci/pcie: Avoid unnecessary PCIe link retrains

On Thu, 05 Nov 2009 12:05:11 +0900
Kenji Kaneshige <kaneshige.kenji@...fujitsu.com> 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()).
> 
> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
> 
> ---
>  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, &reg16);
>  	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 */
> 
> 

Applied this one to linux-next, thanks Kenji-san.

-- 
Jesse Barnes, Intel Open Source Technology Center
--
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