On Fri, Aug 17, 2018 at 12:33 PM Arnd Bergmann <arnd@xxxxxxxx> wrote:
>
> The acpi_pci_create_root_bus() can be fully integrated into
> acpi_pci_root_create(), improving a few things:
>
> * We can call pci_scan_root_bus_bridge(), which registers and
> scans the bridge in one step.
> * After a failure in pci_register_host_bridge(), we correctly
> clean up the resources.
> * The bridge settings (release function, flags, operations etc)
> can get set up before registering the bridge.
> * Further cleanup would be possible, removing duplication between
> pci_host_bridge and some ACPI structures.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/acpi/pci_root.c | 68 +++++++++++++++--------------------------
> 1 file changed, 24 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index 85dbcf47015b..5f73de3b67c8 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -873,34 +873,6 @@ static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
> __acpi_pci_root_release_info(bridge->release_data);
> }
>
> -static struct pci_bus *acpi_pci_create_root_bus(struct device *parent, int bus,
> - struct pci_ops *ops, void *sysdata, struct list_head *resources)
> -{
> - int error;
> - struct pci_host_bridge *bridge;
> -
> - bridge = pci_alloc_host_bridge(0);
> - if (!bridge)
> - return NULL;
> -
> - bridge->dev.parent = parent;
> -
> - list_splice_init(resources, &bridge->windows);
> - bridge->sysdata = sysdata;
> - bridge->busnr = bus;
> - bridge->ops = ops;
> -
> - error = pci_register_host_bridge(bridge);
> - if (error < 0)
> - goto err_out;
> -
> - return bridge->bus;
> -
> -err_out:
> - kfree(bridge);
> - return NULL;
> -}
> -
> struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
> struct acpi_pci_root_ops *ops,
> struct acpi_pci_root_info *info,
> @@ -909,8 +881,7 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
> int ret, busnum = root->secondary.start;
> struct acpi_device *device = root->device;
> int node = acpi_get_node(device->handle);
> - struct pci_bus *bus;
> - struct pci_host_bridge *host_bridge;
> + struct pci_host_bridge *bridge;
Why "bridge" and not "host" or even something to stand for "root complex"?
Or maybe it can still be "host_bridge"?
>
> info->root = root;
> info->bridge = device;
> @@ -930,30 +901,39 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
>
> pci_acpi_root_add_resources(info);
> pci_add_resource(&info->resources, &root->secondary);
> - bus = acpi_pci_create_root_bus(NULL, busnum, ops->pci_ops,
> - sysdata, &info->resources);
> - if (!bus)
> +
> + bridge = pci_alloc_host_bridge(0);
> + if (!bridge)
> goto out_release_info;
>
> - host_bridge = to_pci_host_bridge(bus->bridge);
> + list_splice_init(&info->resources, &bridge->windows);
> + bridge->sysdata = sysdata;
> + bridge->busnr = busnum;
> + bridge->ops = ops->pci_ops;
> + pci_set_host_bridge_release(bridge, acpi_pci_root_release_info,
> + info);
> +
> if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
> - host_bridge->native_pcie_hotplug = 0;
> + bridge->native_pcie_hotplug = 0;
> if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
> - host_bridge->native_shpc_hotplug = 0;
> + bridge->native_shpc_hotplug = 0;
> if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))
> - host_bridge->native_aer = 0;
> + bridge->native_aer = 0;
> if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))
> - host_bridge->native_pme = 0;
> + bridge->native_pme = 0;
> if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))
> - host_bridge->native_ltr = 0;
> + bridge->native_ltr = 0;
> +
> + ret = pci_scan_root_bus_bridge(bridge);
> + if (ret < 0)
> + goto out_release_bridge;
>
> - pci_scan_child_bus(bus);
> - pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info,
> - info);
> if (node != NUMA_NO_NODE)
> - dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
> - return bus;
> + dev_printk(KERN_DEBUG, &bridge->bus->dev, "on NUMA node %d\n", node);
> + return bridge->bus;
>
> +out_release_bridge:
> + pci_free_host_bridge(bridge);
> out_release_info:
> __acpi_pci_root_release_info(info);
> return NULL;
> --
> 2.18.0
>
