s390/pci: adaptation of iommu to multifunction
In the future the bus sysdata may not directly point to the zpci_dev. In preparation of upcoming patches let us abstract the access to the zpci_dev from the device inside the pci device. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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