/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* AMD Athlon64/Opteron Model-Specific Poller Implementation
*/
#include <sys/types.h>
#include "ao.h"
/*
* Decide whether the caller should poll the NB. The decision is made
* and any poll is performed under protection of the chip-wide mutex
* enforced at the caller's level. That mutex already ensures that all
* pollers on a chip are serialized - the following is simply to
* avoid the NB poll ping-ponging between different detectors.
*/
uint64_t
ao_ms_poll_ownermask(cmi_hdl_t hdl, hrtime_t pintvl)
{
ao_ms_data_t *ao = cms_hdl_getcmsdata(hdl);
hrtime_t now = gethrtime_waitfree();
hrtime_t last = ao->ao_ms_shared->aos_nb_poll_timestamp;
int dopoll = 0;
if (now - last > 2 * pintvl || last == 0) {
/*
* If no last value has been recorded assume ownership.
* Otherwise only take over if the current "owner" seems
* to be making little progress.
*/
ao->ao_ms_shared->aos_nb_poll_owner = hdl;
dopoll = 1;
} else if (ao->ao_ms_shared->aos_nb_poll_owner == hdl) {
/*
* This is the current owner and it is making progress.
*/
dopoll = 1;
}
if (dopoll)
ao->ao_ms_shared->aos_nb_poll_timestamp = now;
return (dopoll ? -1ULL : ~(1 << AMD_MCA_BANK_NB));
}