linux-kernel - Re: [PATCH v3 04/27] PCI: Add is_pci_*_resource

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Date:	Thu, 4 Apr 2013 16:23:50 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ram Pai <linuxram@...ibm.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 04/27] PCI: Add is_pci_*_resource_idx() helpers

On Wed, Mar 13, 2013 at 5:27 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> According to resource pointer find out if the resource is some type resource
> like bridge, sriov, or std.
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  include/linux/pci.h |   23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 127a856..efb348b 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -92,6 +92,29 @@ enum {
>         DEVICE_COUNT_RESOURCE = PCI_NUM_RESOURCES,
>  };
>
> +static inline bool is_pci_std_resource_idx(int i)
> +{
> +       return i >= PCI_STD_RESOURCES && i <= PCI_STD_RESOURCE_END;
> +}
> +
> +static inline bool is_pci_rom_resource_idx(int i)
> +{
> +       return i == PCI_ROM_RESOURCE;
> +}
> +
> +static inline bool is_pci_iov_resource_idx(int i)
> +{
> +#ifdef CONFIG_PCI_IOV
> +       return i >= PCI_IOV_RESOURCES && i <= PCI_IOV_RESOURCE_END;
> +#endif
> +       return false;
> +}
> +
> +static inline bool is_pci_bridge_resource_idx(int i)
> +{
> +       return i >= PCI_BRIDGE_RESOURCES && i <= PCI_BRIDGE_RESOURCE_END;
> +}
> +
>  typedef int __bitwise pci_power_t;
>
>  #define PCI_D0         ((pci_power_t __force) 0)

1) I don't like adding more "_idx()" interfaces.

2) The only one of these that's even used is "is_pci_bridge_resource_idx()"

3) I think adding a wrapper struct with a "type" or "flags" field
would make this trivial, e.g., "pres->flags & PCI_RESOURCE_WINDOW" or
something.
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