powerpc/vas: Define vas_win_paste_addr()
Define an interface that the NX drivers can use to find the physical paste address of a send window. This interface is expected to be used with the mmap() operation of the NX driver's device. i.e the user space process can use driver's mmap() operation to map the send window's paste address into their address space and then use copy and paste instructions to submit the CRBs to the NX engine. Note that kernel drivers will use vas_paste_crb() directly and don't need this interface. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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