PCI: Add pcibios hooks for adding and removing PCI buses

On ACPI-based platforms, the pci_slot driver creates PCI slot devices
according to information from ACPI tables by registering an ACPI PCI
subdriver.  The ACPI PCI subdriver will only be called when creating/
destroying PCI root buses, and it won't be called when hot-plugging
P2P bridges.  It may cause stale PCI slot devices after hot-removing
a P2P bridge if that bridge has associated PCI slots.  And the acpiphp
driver has the same issue too.

This patch introduces two hook points into the PCI core, which will
be invoked when creating/destroying PCI buses for PCI host and P2P
bridges.  They could be used to setup/destroy platform dependent stuff
in a unified way, both at boot time and for PCI hotplug operations.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Myron Stowe <myron.stowe@redhat.com>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 45c93b39af35faa192e37eeb8338d3c216ff4c87..43ece5d41d36ca428068ef8b09f01f5956f10a25 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -673,6 +673,8 @@ add_dev:
        ret = device_register(&child->dev);
        WARN_ON(ret < 0);
 
+       pcibios_add_bus(child);
+
        /* Create legacy_io and legacy_mem files for this bus */
        pci_create_legacy_files(child);
 
@@ -1660,6 +1662,14 @@ int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
        return 0;
 }
 
+void __weak pcibios_add_bus(struct pci_bus *bus)
+{
+}
+
+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)
 {
@@ -1714,6 +1724,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
        if (error)
                goto class_dev_reg_err;
 
+       pcibios_add_bus(b);
+
        /* Create legacy_io and legacy_mem files for this bus */
        pci_create_legacy_files(b);
 

diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index a8318801c092581716b2e5881d0fc31ff2340f53..8fc54b7327bc02b59af4a6455bcf43bdaf597252 100644 (file)
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -51,6 +51,7 @@ void pci_remove_bus(struct pci_bus *bus)
        pci_bus_release_busn_res(bus);
        up_write(&pci_bus_sem);
        pci_remove_legacy_files(bus);
+       pcibios_remove_bus(bus);
        device_unregister(&bus->dev);
 }
 EXPORT_SYMBOL(pci_remove_bus);

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 2461033a798728203f456eff4d6a0099816a7072..be9399452133a43cd8bdabf83440d84327eaa034 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -678,6 +678,8 @@ extern struct list_head pci_root_buses;     /* list of all known PCI buses */
 extern int no_pci_devices(void);
 
 void pcibios_resource_survey_bus(struct pci_bus *bus);
+void pcibios_add_bus(struct pci_bus *bus);
+void pcibios_remove_bus(struct pci_bus *bus);
 void pcibios_fixup_bus(struct pci_bus *);
 int __must_check pcibios_enable_device(struct pci_dev *, int mask);
 /* Architecture specific versions may override this (weak) */