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 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Generic x86 CPU MCA poller - support functions for native and xpv pollers.
29 */
30
31 #include <sys/types.h>
32 #include <sys/sysmacros.h>
33 #include <sys/sdt.h>
34 #include <sys/cmn_err.h>
35
36 #include "gcpu.h"
37
38 uint_t gcpu_poll_trace_nent = 100;
39
40 #ifdef DEBUG
41 int gcpu_poll_trace_always = 1;
42 #else
43 int gcpu_poll_trace_always = 0;
44 #endif
45
46 void
gcpu_poll_trace(gcpu_poll_trace_ctl_t * ptc,uint8_t what,uint8_t nerr)47 gcpu_poll_trace(gcpu_poll_trace_ctl_t *ptc, uint8_t what, uint8_t nerr)
48 {
49 gcpu_poll_trace_t *pt;
50 uint_t next;
51
52 DTRACE_PROBE2(gcpu__mca__poll__trace, uint32_t, what, uint32_t, nerr);
53
54 if (ptc->mptc_tbufs == NULL)
55 return; /* poll trace buffer is disabled */
56
57 next = (ptc->mptc_curtrace + 1) % gcpu_poll_trace_nent;
58 pt = &ptc->mptc_tbufs[next];
59
60 pt->mpt_when = 0;
61 pt->mpt_what = what;
62
63 pt->mpt_nerr = MIN(nerr, UINT8_MAX);
64
65 pt->mpt_when = gethrtime_waitfree();
66 ptc->mptc_curtrace = next;
67 }
68
69 void
gcpu_poll_trace_init(gcpu_poll_trace_ctl_t * ptc)70 gcpu_poll_trace_init(gcpu_poll_trace_ctl_t *ptc)
71 {
72 gcpu_poll_trace_t *tbufs = NULL;
73
74 if (gcpu_poll_trace_always) {
75 tbufs = kmem_zalloc(sizeof (gcpu_poll_trace_t) *
76 gcpu_poll_trace_nent, KM_SLEEP);
77 }
78
79 ptc->mptc_tbufs = tbufs;
80 ptc->mptc_curtrace = 0;
81 }
82