d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
e59faa5014
freebsd-skq/sys/amd64/include/mca.h

50 lines
1.7 KiB
C
Raw Normal View History

Implement simple machine check support for amd64 and i386. - For CPUs that only support MCE (the machine check exception) but not MCA (i.e. Pentium), all this does is print out the value of the machine check registers and then panic when a machine check exception occurs. - For CPUs that support MCA (the machine check architecture), the support is a bit more involved. - First, there is limited support for decoding the CPU-independent MCA error codes in the kernel, and the kernel uses this to output a short description of any machine check events that occur. - When a machine check exception occurs, all of the MCx banks on the current CPU are scanned and any events are reported to the console before panic'ing. - To catch events for correctable errors, a periodic timer kicks off a task which scans the MCx banks on all CPUs. The frequency of these checks is controlled via the "hw.mca.interval" sysctl. - Userland can request an immediate scan of the MCx banks by writing a non-zero value to "hw.mca.force_scan". - If any correctable events are encountered, the appropriate details are stored in a 'struct mca_record' (defined in <machine/mca.h>). The "hw.mca.count" is a count of such records and each record may be queried via the "hw.mca.records" tree by specifying the record index (0 .. count - 1) as the next name in the MIB similar to using PIDs with the kern.proc.* sysctls. The idea is to export machine check events to userland for more detailed processing. - The periodic timer and hw.mca sysctls are only present if the CPU supports MCA. Discussed with: emaste (briefly) MFC after: 1 month
2009-05-13 17:53:04 +00:00
/*-
* Copyright (c) 2009 Advanced Computing Technologies LLC
* Written by: John H. Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef __MACHINE_MCA_H__
#define __MACHINE_MCA_H__
struct mca_record {
uint64_t mr_status;
uint64_t mr_addr;
uint64_t mr_misc;
uint64_t mr_tsc;
int mr_apic_id;
mca: improve status checking, recording and reporting - directly print mca information in case we fail to allocate memory for a record - include bank number into mca record - print raw mca status value for extended information Reviewed by: jhb MFC after: 10 days
2009-12-02 15:45:55 +00:00
int mr_bank;
Implement simple machine check support for amd64 and i386. - For CPUs that only support MCE (the machine check exception) but not MCA (i.e. Pentium), all this does is print out the value of the machine check registers and then panic when a machine check exception occurs. - For CPUs that support MCA (the machine check architecture), the support is a bit more involved. - First, there is limited support for decoding the CPU-independent MCA error codes in the kernel, and the kernel uses this to output a short description of any machine check events that occur. - When a machine check exception occurs, all of the MCx banks on the current CPU are scanned and any events are reported to the console before panic'ing. - To catch events for correctable errors, a periodic timer kicks off a task which scans the MCx banks on all CPUs. The frequency of these checks is controlled via the "hw.mca.interval" sysctl. - Userland can request an immediate scan of the MCx banks by writing a non-zero value to "hw.mca.force_scan". - If any correctable events are encountered, the appropriate details are stored in a 'struct mca_record' (defined in <machine/mca.h>). The "hw.mca.count" is a count of such records and each record may be queried via the "hw.mca.records" tree by specifying the record index (0 .. count - 1) as the next name in the MIB similar to using PIDs with the kern.proc.* sysctls. The idea is to export machine check events to userland for more detailed processing. - The periodic timer and hw.mca sysctls are only present if the CPU supports MCA. Discussed with: emaste (briefly) MFC after: 1 month
2009-05-13 17:53:04 +00:00
};
#ifdef _KERNEL
void mca_init(void);
int mca_intr(void);
#endif
#endif /* !__MACHINE_MCA_H__ */
Reference in New Issue Copy Permalink