s390/pci: PCI hotplug support via SCLP
Add SCLP PCI configure/deconfigure and implement a PCI hotplug
controller (s390_pci_hpc). The hotplug controller creates a slot
for every PCI function in stand-by or configured state. The PCI
functions are named after the PCI function ID (fid). By writing to
the power attribute in /sys/bus/pci/slots/<fid>/power the PCI function
is moved to stand-by or configured state. If moved to the configured
state the device is automatically scanned by the s390 PCI layer.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/pci/hotplug/Kconfig b/drivers/pci/hotplug/Kconfig
index b0e46de..13e9e63 100644
--- a/drivers/pci/hotplug/Kconfig
+++ b/drivers/pci/hotplug/Kconfig
@@ -151,4 +151,15 @@
When in doubt, say N.
+config HOTPLUG_PCI_S390
+ tristate "System z PCI Hotplug Support"
+ depends on S390 && 64BIT
+ help
+ Say Y here if you want to use the System z PCI Hotplug
+ driver for PCI devices. Without this driver it is not
+ possible to access stand-by PCI functions nor to deconfigure
+ PCI functions.
+
+ When in doubt, say Y.
+
endif # HOTPLUG_PCI