1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/*
30 * AMD Athlon64/Opteron Model-Specific Poller Implementation
31 */
32
33#include <sys/types.h>
34
35#include "ao.h"
36
37/*
38 * Decide whether the caller should poll the NB.  The decision is made
39 * and any poll is performed under protection of the chip-wide mutex
40 * enforced at the caller's level.  That mutex already ensures that all
41 * pollers on a chip are serialized - the following is simply to
42 * avoid the NB poll ping-ponging between different detectors.
43 */
44uint64_t
45ao_ms_poll_ownermask(cmi_hdl_t hdl, hrtime_t pintvl)
46{
47	ao_ms_data_t *ao = cms_hdl_getcmsdata(hdl);
48	hrtime_t now = gethrtime_waitfree();
49	hrtime_t last = ao->ao_ms_shared->aos_nb_poll_timestamp;
50	int dopoll = 0;
51
52	if (now - last > 2 * pintvl || last == 0) {
53		/*
54		 * If no last value has been recorded assume ownership.
55		 * Otherwise only take over if the current "owner" seems
56		 * to be making little progress.
57		 */
58		ao->ao_ms_shared->aos_nb_poll_owner = hdl;
59		dopoll = 1;
60	} else if (ao->ao_ms_shared->aos_nb_poll_owner == hdl) {
61		/*
62		 * This is the current owner and it is making progress.
63		 */
64		dopoll = 1;
65	}
66
67	if (dopoll)
68		ao->ao_ms_shared->aos_nb_poll_timestamp = now;
69
70	return (dopoll ? -1ULL : ~(1 << AMD_MCA_BANK_NB));
71}
72