usr/src/uts/i86pc/cpu/generic_cpu/gcpu_poll_subr.c

   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
  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
  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 }