powerpc/pseries: Introduce api_version to migration sysfs interface
The /sys/kernel/mobility/migration interface was added all the way back in 2.6.37. However, the drmgr userspace tool was never augmented to use this interface to perfrom migrations. Instead it has continued using a faux rtas call coupled with performing the device tree update processing in userspace and communicating it back to the kernel via the ugly /proc/ppc64/ofdt interface. Up until 3.12 the device tree update code in the kernel was badly broken and bit rotting. This code was fixed in 3.12 and is now utilized by the kernel suspend code as of 3.15. The kernel is now better suited to handle the post-mobility fixup of the device tree and drmgr should be transitioned to using the sysfs migration interface. This patch introduces the api_version sysfs file to /sys/kernel/mobility as a means for drmgr to query the current implementation level of the kernel migration code. This initial versioning indicates it is capable of perfroming all current PAPR requirements for migration including the post-mobility firmware activation and device tree update. Signed-off-by: NTyrel Datwyler <tyreld@linux.vnet.ibm.com> Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com> Cc: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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