linux-kernel - Re: [PATCH -v2] PCI/VFIO: use pcie_flags_reg instead of access PCI-E Capabilities Register

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Message-ID: <5166A487.8060704@huawei.com>
Date:	Thu, 11 Apr 2013 19:54:47 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	Yijing Wang <wangyijing@...wei.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Hanjun Guo <guohanjun@...wei.com>, <jiang.liu@...wei.com>
Subject: Re: [PATCH -v2] PCI/VFIO: use pcie_flags_reg instead of access PCI-E
 Capabilities Register

ping?

On 2013/4/2 9:52, Yijing Wang wrote:
> Currently, we use pcie_flags_reg to cache PCI-E Capabilities Register,
> because PCI-E Capabilities Register bits are almost read-only. This patch
> use pcie_caps_reg() instead of another access PCI-E Capabilities Register.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
>  drivers/vfio/pci/vfio_pci_config.c |    6 +-----
>  1 files changed, 1 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
> index aeb00fc..12a81f7 100644
> --- a/drivers/vfio/pci/vfio_pci_config.c
> +++ b/drivers/vfio/pci/vfio_pci_config.c
> @@ -1017,13 +1017,9 @@ static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
>  		return byte;
>  	case PCI_CAP_ID_EXP:
>  		/* length based on version */
> -		ret = pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &word);
> -		if (ret)
> -			return pcibios_err_to_errno(ret);
> -
>  		vdev->extended_caps = true;
>  
> -		if ((word & PCI_EXP_FLAGS_VERS) == 1)
> +		if ((pcie_caps_reg(pdev) & PCI_EXP_FLAGS_VERS) == 1)
>  			return PCI_CAP_EXP_ENDPOINT_SIZEOF_V1;
>  		else
>  			return PCI_CAP_EXP_ENDPOINT_SIZEOF_V2;
> 


-- 
Thanks!
Yijing

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