[PATCH v3 05/10] resource: add PCI configuration space support

[Bjorn Helgaas]

On Thu, Jul 26, 2012 at 12:55 PM, Thierry Reding
<thierry.reding at avionic-design.de> wrote:
> This commit adds a new flag that allows marking resources as PCI
> configuration space.
>
> Signed-off-by: Thierry Reding <thierry.reding at avionic-design.de>
> ---
> Changes in v3:
> - new patch
>
>  include/linux/ioport.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/ioport.h b/include/linux/ioport.h
> index 589e0e7..3314843 100644
> --- a/include/linux/ioport.h
> +++ b/include/linux/ioport.h
> @@ -102,7 +102,7 @@ struct resource {
>
>  /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
>  #define IORESOURCE_PCI_FIXED           (1<<4)  /* Do not move resource */
> -
> +#define IORESOURCE_PCI_CS              (1<<5)  /* PCI configuration space */

What is the purpose of this?  It seems that you are marking regions
that we call MMCONFIG on x86, or ECAM-type regions in the language of
the PCIe spec.  I see that you set it in several places, but I don't
see anything that ever looks for it.  Do you have plans to use it in
the future?  If it really does correspond to MMCONFIG/ECAM, we should
handle those regions consistently across all architectures.

>  /* helpers to define resources */
>  #define DEFINE_RES_NAMED(_start, _size, _name, _flags)                 \
> --
> 1.7.11.2
>