linux-kernel - [PATCH v4 06/10] watchdog/hpwdt: condition early return of NMI handler on iLO5

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Date:   Sun, 25 Feb 2018 14:32:55 -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, mingo@...nel.org,
        marcus.folkesson@...il.com, Jerry Hoemann <jerry.hoemann@....com>
Subject: [PATCH v4 06/10] watchdog/hpwdt: condition early return of NMI handler on iLO5

Modify prior change to not claim an NMI unless originated
from iLO to apply only to iLO5 and later going forward.
This restores hpwdt traditional behavior of calling panic
if the NMI is NMI_IO_CHECK, NMI_SERR, or NMI_UNKNOWN for
legacy hardware.

Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
---
 drivers/watchdog/hpwdt.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 1a18326bc99d..e60c689ebdb2 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -32,6 +32,7 @@
 #define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)
 #define DEFAULT_MARGIN			30
 
+static bool iLO5;
 static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
 static unsigned int reload;			/* the computed soft_margin */
 static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -121,7 +122,7 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
 		"3. OA Forward Progress Log\n"
 		"4. iLO Event Log";
 
-	if ((ulReason == NMI_UNKNOWN) && mynmi)
+	if (iLO5 && ulReason == NMI_UNKNOWN && mynmi)
 		return NMI_DONE;
 
 	if (allow_kdump)
@@ -279,6 +280,9 @@ static int hpwdt_init_one(struct pci_dev *dev,
 			", timer margin: %d seconds (nowayout=%d).\n",
 			HPWDT_VERSION, hpwdt_dev.timeout, nowayout);
 
+	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
+		iLO5 = 1;
+
 	return 0;
 
 error_wd_register:
-- 
2.13.6