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 /* 28 * AMD Athlon64/Opteron Model-Specific Poller Implementation 29 */ 30 31 #include <sys/types.h> 32 33 #include "ao.h" 34 35 /* 36 * Decide whether the caller should poll the NB. The decision is made 37 * and any poll is performed under protection of the chip-wide mutex 38 * enforced at the caller's level. That mutex already ensures that all 39 * pollers on a chip are serialized - the following is simply to 40 * avoid the NB poll ping-ponging between different detectors. 41 */ 42 uint64_t ao_ms_poll_ownermask(cmi_hdl_t hdl,hrtime_t pintvl)43ao_ms_poll_ownermask(cmi_hdl_t hdl, hrtime_t pintvl) 44 { 45 ao_ms_data_t *ao = cms_hdl_getcmsdata(hdl); 46 hrtime_t now = gethrtime_waitfree(); 47 hrtime_t last = ao->ao_ms_shared->aos_nb_poll_timestamp; 48 int dopoll = 0; 49 50 if (now - last > 2 * pintvl || last == 0) { 51 /* 52 * If no last value has been recorded assume ownership. 53 * Otherwise only take over if the current "owner" seems 54 * to be making little progress. 55 */ 56 ao->ao_ms_shared->aos_nb_poll_owner = hdl; 57 dopoll = 1; 58 } else if (ao->ao_ms_shared->aos_nb_poll_owner == hdl) { 59 /* 60 * This is the current owner and it is making progress. 61 */ 62 dopoll = 1; 63 } 64 65 if (dopoll) 66 ao->ao_ms_shared->aos_nb_poll_timestamp = now; 67 68 return (dopoll ? -1ULL : ~(1 << AMD_MCA_BANK_NB)); 69 } 70