On Wed, Feb 1, 2012 at 2:43 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> also add busn_res into struct pci_bus.
>
> will use them to have bus number resource tree.
Will you make this tree visible in /proc? Seems like that would be
useful for debugging and for symmetry with /proc/iomem and
/proc/ioports.
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> ---
> include/linux/ioport.h | 1 +
> include/linux/pci.h | 1 +
> kernel/resource.c | 8 ++++++++
> 3 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/ioport.h b/include/linux/ioport.h
> index e885ba2..6fe9e19 100644
> --- a/include/linux/ioport.h
> +++ b/include/linux/ioport.h
> @@ -136,6 +136,7 @@ struct resource {
> /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
> extern struct resource ioport_resource;
> extern struct resource iomem_resource;
> +extern struct resource iobusn_resource;
>
> extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
> extern int request_resource(struct resource *root, struct resource *new);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index f8caaab..94ad468 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -419,6 +419,7 @@ struct pci_bus {
> struct list_head slots; /* list of slots on this bus */
> struct resource *resource[PCI_BRIDGE_RESOURCE_NUM];
> struct list_head resources; /* address space routed to this bus */
> + struct resource busn_res; /* track registered bus num range */
Is this different from bus.secondary and bus.subordinate? Do we need
both busn_res and secondary/subordinate? If we need both, in what
circumstance with they contain different information?
> struct pci_ops *ops; /* configuration access functions */
> void *sysdata; /* hook for sys-specific extension */
> diff --git a/kernel/resource.c b/kernel/resource.c
> index 7640b3a..53b42f0 100644
> --- a/kernel/resource.c
> +++ b/kernel/resource.c
> @@ -38,6 +38,14 @@ struct resource iomem_resource = {
> };
> EXPORT_SYMBOL(iomem_resource);
>
> +struct resource iobusn_resource = {
> + .name = "PCI busn",
> + .start = 0,
> + .end = 0xffffff,
> + .flags = IORESOURCE_BUS,
> +};
> +EXPORT_SYMBOL(iobusn_resource);
> +
> /* constraints to be met while allocating resources */
> struct resource_constraint {
> resource_size_t min, max, align;
> --
> 1.7.7
>
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