This patch turns on PCI bus lock mechanism for x86 platforms. It also
enhances x86 specific PCI implementation to support PCI bus lock.
Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>
---
arch/x86/pci/acpi.c | 6 +++++-
arch/x86/pci/common.c | 12 ++++++++++++
drivers/pci/Kconfig | 3 +--
3 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 2bb885a..c68dbdf 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -414,7 +414,8 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
* Maybe the desired pci bus has been already scanned. In such case
* it is unnecessary to scan the pci bus with the given domain,busnum.
*/
- bus = pci_find_bus(domain, busnum);
+ bus = __pci_get_and_lock_bus(domain, busnum,
+ PCI_BUS_STATE_STOPPING - 1);
if (bus) {
/*
* If the desired bus exits, the content of bus->sysdata will
@@ -449,6 +450,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
pci_free_resource_list(&resources);
__release_pci_root_info(info);
}
+ pci_bus_get(bus);
}
/* After the PCI-E bus has been walked and all devices discovered,
@@ -475,6 +477,8 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
#endif
}
+ pci_unlock_and_put_bus(bus);
+
return bus;
}
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 0ad990a..8b7ae63 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -667,6 +667,18 @@ struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
}
+static DEFINE_MUTEX(pci_root_bus_mutex);
+
+void arch_pci_lock_host_bridge_hotplug(void)
+{
+ mutex_lock(&pci_root_bus_mutex);
+}
+
+void arch_pci_unlock_host_bridge_hotplug(void)
+{
+ mutex_unlock(&pci_root_bus_mutex);
+}
+
/*
* NUMA info for PCI busses
*
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index a6df8b1..1bbe924 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -122,5 +122,4 @@ config PCI_LABEL
select NLS
config PCI_BUS_LOCK
- bool
- default n
+ def_bool y if X86
--
1.7.9.5
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