From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001
From: José Pekkarinen <jose.pekkarinen@nokia.com>
Date: Mon, 11 Apr 2016 10:41:07 +0300
Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources
 are taken from kernel.org, and rt patch from the rt wiki download page.
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During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
---
 kernel/Documentation/watchdog/src/watchdog-test.c  | 22 +++++++++++++++++-----
 .../Documentation/watchdog/watchdog-kernel-api.txt |  7 +++++++
 .../Documentation/watchdog/watchdog-parameters.txt |  3 +++
 3 files changed, 27 insertions(+), 5 deletions(-)

(limited to 'kernel/Documentation/watchdog')

diff --git a/kernel/Documentation/watchdog/src/watchdog-test.c b/kernel/Documentation/watchdog/src/watchdog-test.c
index 3da822967..fcdde8fc9 100644
--- a/kernel/Documentation/watchdog/src/watchdog-test.c
+++ b/kernel/Documentation/watchdog/src/watchdog-test.c
@@ -41,6 +41,7 @@ static void term(int sig)
 int main(int argc, char *argv[])
 {
     int flags;
+    unsigned int ping_rate = 1;
 
     fd = open("/dev/watchdog", O_WRONLY);
 
@@ -63,22 +64,33 @@ int main(int argc, char *argv[])
 	    fprintf(stderr, "Watchdog card enabled.\n");
 	    fflush(stderr);
 	    goto end;
+	} else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
+	    flags = atoi(argv[2]);
+	    ioctl(fd, WDIOC_SETTIMEOUT, &flags);
+	    fprintf(stderr, "Watchdog timeout set to %u seconds.\n", flags);
+	    fflush(stderr);
+	    goto end;
+	} else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
+	    ping_rate = strtoul(argv[2], NULL, 0);
+	    fprintf(stderr, "Watchdog ping rate set to %u seconds.\n", ping_rate);
+	    fflush(stderr);
 	} else {
-	    fprintf(stderr, "-d to disable, -e to enable.\n");
+	    fprintf(stderr, "-d to disable, -e to enable, -t <n> to set " \
+		"the timeout,\n-p <n> to set the ping rate, and \n");
 	    fprintf(stderr, "run by itself to tick the card.\n");
 	    fflush(stderr);
 	    goto end;
 	}
-    } else {
-	fprintf(stderr, "Watchdog Ticking Away!\n");
-	fflush(stderr);
     }
 
+    fprintf(stderr, "Watchdog Ticking Away!\n");
+    fflush(stderr);
+
     signal(SIGINT, term);
 
     while(1) {
 	keep_alive();
-	sleep(1);
+	sleep(ping_rate);
     }
 end:
     close(fd);
diff --git a/kernel/Documentation/watchdog/watchdog-kernel-api.txt b/kernel/Documentation/watchdog/watchdog-kernel-api.txt
index a0438f395..d8b0d3367 100644
--- a/kernel/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/kernel/Documentation/watchdog/watchdog-kernel-api.txt
@@ -36,6 +36,10 @@ The watchdog_unregister_device routine deregisters a registered watchdog timer
 device. The parameter of this routine is the pointer to the registered
 watchdog_device structure.
 
+The watchdog subsystem includes an registration deferral mechanism,
+which allows you to register an watchdog as early as you wish during
+the boot process.
+
 The watchdog device structure looks like this:
 
 struct watchdog_device {
@@ -52,6 +56,7 @@ struct watchdog_device {
 	void *driver_data;
 	struct mutex lock;
 	unsigned long status;
+	struct list_head deferred;
 };
 
 It contains following fields:
@@ -80,6 +85,8 @@ It contains following fields:
   information about the status of the device (Like: is the watchdog timer
   running/active, is the nowayout bit set, is the device opened via
   the /dev/watchdog interface or not, ...).
+* deferred: entry in wtd_deferred_reg_list which is used to
+  register early initialized watchdogs.
 
 The list of watchdog operations is defined as:
 
diff --git a/kernel/Documentation/watchdog/watchdog-parameters.txt b/kernel/Documentation/watchdog/watchdog-parameters.txt
index 692791cc6..9f9ec9f76 100644
--- a/kernel/Documentation/watchdog/watchdog-parameters.txt
+++ b/kernel/Documentation/watchdog/watchdog-parameters.txt
@@ -208,6 +208,9 @@ nowayout: Watchdog cannot be stopped once started
 -------------------------------------------------
 omap_wdt:
 timer_margin: initial watchdog timeout (in seconds)
+early_enable: Watchdog is started on module insertion (default=0
+nowayout: Watchdog cannot be stopped once started
+	(default=kernel config parameter)
 -------------------------------------------------
 orion_wdt:
 heartbeat: Initial watchdog heartbeat in seconds
-- 
cgit 1.2.3-korg