linux-kernel - [PATCH] watchdog: qcom: Report reboot reason

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1459816666-87185-1-git-send-email-groeck@chromium.org>
Date:	Mon,  4 Apr 2016 17:37:46 -0700
From:	Guenter Roeck <groeck@...omium.org>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	Guenter Roeck <linux@...ck-us.net>, linux-watchdog@...r.kernel.org,
	linux-kernel@...r.kernel.org, Guenter Roeck <groeck@...omium.org>,
	Grant Grundler <grundler@...omium.org>
Subject: [PATCH] watchdog: qcom: Report reboot reason

The Qualcom watchdog timer block reports if the system was reset by the
watchdog. Pass the information to user space.

Cc: Grant Grundler <grundler@...omium.org>
Signed-off-by: Guenter Roeck <groeck@...omium.org>
---
 drivers/watchdog/qcom-wdt.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 20563cc..a043fa4 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -21,6 +21,7 @@
 
 #define WDT_RST		0x38
 #define WDT_EN		0x40
+#define WDT_STS		0x44
 #define WDT_BITE_TIME	0x5C
 
 struct qcom_wdt {
@@ -108,7 +109,8 @@ static const struct watchdog_ops qcom_wdt_ops = {
 static const struct watchdog_info qcom_wdt_info = {
 	.options	= WDIOF_KEEPALIVEPING
 			| WDIOF_MAGICCLOSE
-			| WDIOF_SETTIMEOUT,
+			| WDIOF_SETTIMEOUT
+			| WDIOF_CARDRESET,
 	.identity	= KBUILD_MODNAME,
 };
 
@@ -171,6 +173,9 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 	wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
 	wdt->wdd.parent = &pdev->dev;
 
+	if (readl(wdt->base + WDT_STS) & 1)
+		wdt->wdd.bootstatus = WDIOF_CARDRESET;
+
 	/*
 	 * If 'timeout-sec' unspecified in devicetree, assume a 30 second
 	 * default, unless the max timeout is less than 30 seconds, then use
-- 
2.8.0.rc3.226.g39d4020