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Commit dfe954e4 authored by Sukadev Bhattiprolu's avatar Sukadev Bhattiprolu Committed by Michael Ellerman
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powerpc/vas: Reduce polling interval for busy state 



A VAS window is normally in "busy" state for only a short duration.
Reduce the time we wait for the window to go to "not-busy" state to
speed-up vas_win_close() a bit.

Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 36a288fe

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

+6 −4
Original line number Diff line number Diff line
@@ -1060,21 +1060,23 @@ int vas_paste_crb(struct vas_window *txwin, int offset, bool re) 
}

EXPORT_SYMBOL_GPL(vas_paste_crb);



/*

 * Wait for the window to go to "not-busy" state. It should only take a

 * short time to queue a CRB, so window should not be busy for too long.

 * Trying 5ms intervals.

 */

static void poll_window_busy_state(struct vas_window *window)

{

	int busy;

	u64 val;



retry:

	/*

	 * Poll Window Busy flag

	 */

	val = read_hvwc_reg(window, VREG(WIN_STATUS));

	busy = GET_FIELD(VAS_WIN_BUSY, val);

	if (busy) {

		val = 0;

		set_current_state(TASK_UNINTERRUPTIBLE);

		schedule_timeout(HZ);

		schedule_timeout(msecs_to_jiffies(5));

		goto retry;

	}

}