powerpc/vas: Define vas_win_id()

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Define an interface to return a system-wide unique id for a given VAS
window.

The vas_win_id() will be used in a follow-on patch to generate an unique
handle for a user space receive window. Applications can use this handle
to pair send and receive windows for fast thread-wakeup.

The hardware refers to this system-wide unique id as a Partition Send
Window ID which is expected to be used during fault handling. Hence the
"pswid" in the function names.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Sukadev Bhattiprolu 2017-11-07 18:23:57 -08:00 • committed by Michael Ellerman

parent 5676be2fb7

commit 61f3cca8cd

3 changed files with 42 additions and 0 deletions

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5

arch/powerpc/include/asm/vas.h

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9

arch/powerpc/platforms/powernv/vas-window.c

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28

arch/powerpc/platforms/powernv/vas.h

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