[PATCH v6 4/6] pci: Introduce a domain number for pci_host_bridge.

Grant Likely
2014-03-07T21:09:17Z

On Wed, 5 Mar 2014 11:48:55 +0000, Liviu Dudau <Liviu.Dudau@arm.com> wrote:
> Make it easier to discover the domain number of a bus by storing
> the number in pci_host_bridge for the root bus. Several architectures
> have their own way of storing this information, so it makes sense
> to try to unify the code. While at this, add a new function that
> creates a root bus in a given domain and make pci_create_root_bus()
> a wrapper around this function.
>
> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
> Tested-by: Tanmay Inamdar <tinamdar@apm.com>

Looks okay to me structure wise, again I'd like an ack from Ben or Arnd.

g.

> ---
> drivers/pci/probe.c | 41 +++++++++++++++++++++++++++++++++--------
> include/linux/pci.h | 4 ++++
> 2 files changed, 37 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index fd11c12..172c615 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1714,8 +1714,9 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
> {
> }
>
> -struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> - struct pci_ops *ops, void *sysdata, struct list_head *resources)
> +struct pci_bus *pci_create_root_bus_in_domain(struct device *parent,
> + int domain, int bus, struct pci_ops *ops, void *sysdata,
> + struct list_head *resources)
> {
> int error;
> struct pci_host_bridge *bridge;
> @@ -1728,30 +1729,34 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>
> bridge = pci_alloc_host_bridge();
> if (!bridge)
> - return NULL;
> + return ERR_PTR(-ENOMEM);
>
> bridge->dev.parent = parent;
> bridge->dev.release = pci_release_host_bridge_dev;
> + bridge->domain_nr = domain;
> error = pcibios_root_bridge_prepare(bridge);
> if (error)
> goto err_out;
>
> b = pci_alloc_bus();
> - if (!b)
> + if (!b) {
> + error = -ENOMEM;
> goto err_out;
> + }
>
> b->sysdata = sysdata;
> b->ops = ops;
> b->number = b->busn_res.start = bus;
> - b2 = pci_find_bus(pci_domain_nr(b), bus);
> + b2 = pci_find_bus(bridge->domain_nr, bus);
> if (b2) {
> /* If we already got to this bus through a different bridge, ignore it */
> dev_dbg(&b2->dev, "bus already known\n");
> + error = -EEXIST;
> goto err_bus_out;
> }
>
> bridge->bus = b;
> - dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
> + dev_set_name(&bridge->dev, "pci%04x:%02x", bridge->domain_nr, bus);
> error = device_register(&bridge->dev);
> if (error) {
> put_device(&bridge->dev);
> @@ -1766,7 +1771,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>
> b->dev.class = &pcibus_class;
> b->dev.parent = b->bridge;
> - dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
> + dev_set_name(&b->dev, "%04x:%02x", bridge->domain_nr, bus);
> error = device_register(&b->dev);
> if (error)
> goto class_dev_reg_err;
> @@ -1816,7 +1821,27 @@ err_bus_out:
> kfree(b);
> err_out:
> kfree(bridge);
> - return NULL;
> + return ERR_PTR(error);
> +}
> +
> +struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> + struct pci_ops *ops, void *sysdata, struct list_head *resources)
> +{
> + int domain_nr;
> + struct pci_bus *b = pci_alloc_bus();
> + if (!b)
> + return NULL;
> +
> + b->sysdata = sysdata;
> + domain_nr = pci_domain_nr(b);
> + kfree(b);
> +
> + b = pci_create_root_bus_in_domain(parent, domain_nr, bus,
> + ops, sysdata, resources);
> + if (IS_ERR(b))
> + return NULL;
> +
> + return b;
> }
>
> int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 33aa2ca..1eed009 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -394,6 +394,7 @@ struct pci_host_bridge_window {
> struct pci_host_bridge {
> struct device dev;
> struct pci_bus *bus; /* root bus */
> + int domain_nr;
> struct list_head windows; /* pci_host_bridge_windows */
> void (*release_fn)(struct pci_host_bridge *);
> void *release_data;
> @@ -747,6 +748,9 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
> struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> struct pci_ops *ops, void *sysdata,
> struct list_head *resources);
> +struct pci_bus *pci_create_root_bus_in_domain(struct device *parent,
> + int domain, int bus, struct pci_ops *ops,
> + void *sysdata, struct list_head *resources);
> int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
> int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
> void pci_bus_release_busn_res(struct pci_bus *b);
> --
> 1.9.0
>
>
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