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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>
This commit is contained in:
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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@@ -167,6 +167,11 @@ int vas_copy_crb(void *crb, int offset);
*/
int vas_paste_crb(struct vas_window *win, int offset, bool re);
/*
* Return a system-wide unique id for the VAS window @win.
*/
extern u32 vas_win_id(struct vas_window *win);
/*
* Return the power bus paste address associated with @win so the caller
* can map that address into their address space.