linux-kernel - [PATCH 03/10] watchdog/hpwdt: Update nmi

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Message-Id: <20180206225855.30582-4-jerry.hoemann@hpe.com>
Date:   Tue,  6 Feb 2018 15:58:48 -0700
From:   Jerry Hoemann <jerry.hoemann@....com>
To:     wim@...ux-watchdog.org, linux@...ck-us.net
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        rwright@....com, maurice.a.saldivar@....com,
        Jerry Hoemann <jerry.hoemann@....com>
Subject: [PATCH 03/10] watchdog/hpwdt: Update nmi_panic message.

Include the nmistat in the nmi_panic message to give support
an indication why the NMI was called (e.g. a timeout or generate
nmi button.)

Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
---
 drivers/watchdog/hpwdt.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 260740051084..7f55b9bf371e 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -106,24 +106,35 @@ static int hpwdt_my_nmi(void)
 	return ioread8(hpwdt_nmistat) & 0x6;
 }
 
+static inline int hexdigit(int v)
+{
+	return (v > 9) ? (v-9+'A') : (v+'0');
+}
+
 /*
  *	NMI Handler
  */
 static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
 {
-	if ((ulReason == NMI_UNKNOWN) && !hpwdt_my_nmi())
+	unsigned int mynmi = hpwdt_my_nmi();
+	static char panic_msg[] =
+		"00: An NMI occurred. Depending on your system the reason "
+		"for the NMI is logged in any one of the following resources:\n"
+		"1. Integrated Management Log (IML)\n"
+		"2. OA Syslog\n"
+		"3. OA Forward Progress Log\n"
+		"4. iLO Event Log";
+
+	if ((ulReason == NMI_UNKNOWN) && !mynmi)
 		return NMI_DONE;
 
 	if (allow_kdump)
 		hpwdt_stop();
 
-	nmi_panic(regs, "An NMI occurred. Depending on your system the reason "
-		"for the NMI is logged in any one of the following "
-		"resources:\n"
-		"1. Integrated Management Log (IML)\n"
-		"2. OA Syslog\n"
-		"3. OA Forward Progress Log\n"
-		"4. iLO Event Log");
+	panic_msg[0] = hexdigit((mynmi>>4)&0xf);
+	panic_msg[1] = hexdigit(mynmi&0xf);
+
+	nmi_panic(regs, panic_msg);
 
 	return NMI_HANDLED;
 }
-- 
2.13.6