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s390/pci: PCI hotplug support via SCLP

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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>
This commit is contained in:
Jan Glauber
2012-11-29 14:35:47 +01:00
committed by Martin Schwidefsky
parent cbc0dd1f85
commit 7441b0627e
8 changed files with 351 additions and 2 deletions
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drivers/pci/hotplug/Kconfig
+11
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@@ -151,4 +151,15 @@ config HOTPLUG_PCI_SGI
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