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Date: Mon, 2 Mar 2015 20:37:50 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Yijing Wang <wangyijing@...wei.com>
Cc: Jiang Liu <jiang.liu@...ux.intel.com>, linux-pci@...r.kernel.org,
Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org,
Marc Zyngier <marc.zyngier@....com>,
linux-arm-kernel@...ts.infradead.org,
Russell King <linux@....linux.org.uk>, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Rusty Russell <rusty@...tcorp.com.au>,
Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Guan Xuetao <gxt@...c.pku.edu.cn>, linux-alpha@...r.kernel.org,
linux-m68k@...ts.linux-m68k.org, Liviu Dudau <liviu@...au.co.uk>,
Arnd Bergmann <arnd@...db.de>,
Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v4 09/30] PCI: Separate pci_host_bridge creation out of
pci_create_root_bus()
On Thu, Feb 26, 2015 at 04:12:03PM +0800, Yijing Wang wrote:
> This patch separate pci_host_bridge creation out
> of pci_create_root_bus(), and try to make a generic
> pci_host_bridge, then we could place generic PCI
> infos like domain number in it. Also Ripping out
> pci_host_bridge creation from pci_create_root_bus()
> make code more better readability. Further more,
> we could use the generic pci_host_bridge to hold
> host bridge specific operations like
> pcibios_root_bridge_prepare(). The changes are
> transparent to platform host bridge drivers.
>
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
> drivers/pci/host-bridge.c | 56 ++++++++++++++++++++++
> drivers/pci/probe.c | 114 ++++++++++++++++++++-------------------------
> include/linux/pci.h | 5 ++-
> 3 files changed, 110 insertions(+), 65 deletions(-)
>
> diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> index 39b2dbe..f304f26 100644
> --- a/drivers/pci/host-bridge.c
> +++ b/drivers/pci/host-bridge.c
> @@ -8,6 +8,62 @@
>
> #include "pci.h"
>
> +static void pci_release_host_bridge_dev(struct device *dev)
> +{
> + struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
> +
> + if (bridge->release_fn)
> + bridge->release_fn(bridge);
> +
> + pci_free_resource_list(&bridge->windows);
> + kfree(bridge);
> +}
> +
> +struct pci_host_bridge *pci_create_host_bridge(
> + struct device *parent, u32 db, struct list_head *resources)
> +{
> + int error;
> + int bus = PCI_BUSNUM(db);
> + int domain = PCI_DOMAIN(db);
> + struct pci_host_bridge *host;
> + struct resource_entry *window, *n;
> +
> + host = kzalloc(sizeof(*host), GFP_KERNEL);
> + if (!host)
> + return NULL;
> +
> + host->busnum = bus;
> + host->domain = domain;
> + /* If support CONFIG_PCI_DOMAINS_GENERIC, use
> + * pci_host_assign_domain_nr() to assign domain
> + * number instead PCI_DOMAIN(db).
> + */
> + pci_host_assign_domain_nr(host);
> +
> + host->dev.parent = parent;
> + INIT_LIST_HEAD(&host->windows);
> + host->dev.release = pci_release_host_bridge_dev;
> + dev_set_name(&host->dev, "pci%04x:%02x", host->domain,
> + host->busnum);
> +
> + error = device_register(&host->dev);
> + if (error) {
> + put_device(&host->dev);
> + return NULL;
> + }
> +
> + resource_list_for_each_entry_safe(window, n, resources)
> + list_move_tail(&window->node, &host->windows);
> +
> + return host;
> +}
> +EXPORT_SYMBOL(pci_create_host_bridge);
Why does this need to be exported? I don't want code outside drivers/pci
using something like this.
> +void pci_free_host_bridge(struct pci_host_bridge *host)
> +{
> + device_unregister(&host->dev);
> +}
> +
> static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
> {
> while (bus->parent)
> ...
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index efd9917..13b6b25 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -402,6 +402,7 @@ static inline int pci_channel_offline(struct pci_dev *pdev)
>
> struct pci_host_bridge {
> u16 domain;
> + u16 busnum;
> struct device dev;
> struct pci_bus *bus; /* root bus */
> struct list_head windows; /* resource_entry */
> @@ -415,7 +416,8 @@ void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
> void *release_data);
>
> int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge);
> -
> +struct pci_host_bridge *pci_create_host_bridge(
> + struct device *parent, u32 dombus, struct list_head *resources);
Can these function declarations go in drivers/pci/pci.h instead? I'd
rather not expose them to the rest of the kernel unless we have to.
> /*
> * The first PCI_BRIDGE_RESOURCE_NUM PCI bus resources (those that correspond
> * to P2P or CardBus bridge windows) go in a table. Additional ones (for
> @@ -774,6 +776,7 @@ struct pci_bus *pci_scan_bus_legacy(u32 dombus, struct pci_ops *ops, void *sysda
> struct pci_bus *pci_create_root_bus(struct device *parent, u32 dombus,
> struct pci_ops *ops, void *sysdata,
> struct list_head *resources);
> +void pci_free_host_bridge(struct pci_host_bridge *host);
> 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);
> --
> 1.7.1
>
--
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