From: Don Zickus <dzickus@redhat.com>
To: x86@kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
ak@linux.intel.com, gong.chen@linux.intel.com,
LKML <linux-kernel@vger.kernel.org>,
Don Zickus <dzickus@redhat.com>
Subject: [PATCH 2/5] x86, nmi: Add boot line option 'panic_on_unrecovered_nmi' and 'panic_on_io_nmi'
Date: Wed, 7 May 2014 11:34:40 -0400 [thread overview]
Message-ID: <1399476883-98970-3-git-send-email-dzickus@redhat.com> (raw)
In-Reply-To: <1399476883-98970-1-git-send-email-dzickus@redhat.com>
These options are accessable through /proc/sys/kernel but not on the command
line. The main use is for on board controllers (iLO, DRAC, BMC) to be able
to issue an external NMI to bring down a hung box.
This just makes configuring a box a little easier.
Signed-off-by: Don Zickus <dzickus@redhat.com>
---
Documentation/kernel-parameters.txt | 9 +++++++++
arch/x86/kernel/nmi.c | 14 ++++++++++++++
2 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7116fda..c9da1a7 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2313,6 +2313,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
timeout < 0: reboot immediately
Format: <timeout>
+ panic_on_unrecovered_nmi [X86]
+ Force a machine to panic if an unrecoverable NMI is
+ unclaimed. This covers SERR or UNKONWN NMI cases.
+
+ panic_on_io_nmi [X86]
+ Force a machine to panic if an IO NMI is unclaimed.
+ This covers external NMIs with no handlers associated
+ with them.
+
parkbd.port= [HW] Parallel port number the keyboard adapter is
connected to, default is 0.
Format: <parport#>
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 72fcff7..f3f4c43 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -87,6 +87,20 @@ static int __init setup_unknown_nmi_panic(char *str)
}
__setup("unknown_nmi_panic", setup_unknown_nmi_panic);
+static int __init setup_panic_on_unrecovered_nmi(char *str)
+{
+ panic_on_unrecovered_nmi = 1;
+ return 1;
+}
+__setup("panic_on_unrecovered_nmi", setup_panic_on_unrecovered_nmi);
+
+static int __init setup_panic_on_io_nmi(char *str)
+{
+ panic_on_io_nmi = 1;
+ return 1;
+}
+__setup("panic_on_io_nmi", setup_panic_on_io_nmi);
+
#define nmi_to_desc(type) (&nmi_desc[type])
static u64 nmi_longest_ns = 1 * NSEC_PER_MSEC;
--
1.7.1
next prev parent reply other threads:[~2014-05-07 15:36 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-07 15:34 [PATCH 0/5 RESEND] x86, nmi: Various fixes and cleanups Don Zickus
2014-05-07 15:34 ` [PATCH 1/5] x86, nmi: Add new nmi type 'external' Don Zickus
2014-05-07 15:38 ` Ingo Molnar
2014-05-07 16:02 ` Don Zickus
2014-05-07 16:27 ` Ingo Molnar
2014-05-07 16:48 ` Don Zickus
2014-05-08 16:33 ` Don Zickus
2014-05-08 17:35 ` Ingo Molnar
2014-05-08 17:52 ` Don Zickus
2014-05-09 7:10 ` Ingo Molnar
2014-05-09 13:36 ` Don Zickus
2014-05-07 15:34 ` Don Zickus [this message]
2014-05-07 15:34 ` [PATCH 3/5] x86, nmi: Remove 'reason' value from unknown nmi output Don Zickus
2014-05-07 15:34 ` [PATCH 4/5] x86, nmi: Move default external NMI handler to its own routine Don Zickus
2014-05-07 15:34 ` [PATCH 5/5] x86, nmi: Add better NMI stats to /proc/interrupts and show handlers Don Zickus
2014-05-07 15:42 ` Ingo Molnar
2014-05-07 16:04 ` Don Zickus
2014-05-07 16:30 ` Ingo Molnar
2014-05-07 19:50 ` Elliott, Robert (Server Storage)
2014-05-08 1:28 ` Don Zickus
2014-05-08 6:04 ` Ingo Molnar
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