linux-kernel - [PATCH 3/5] ARM: Register with kernel restart handler

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Message-Id: <20210604140357.2602028-4-lee.jones@linaro.org>
Date:   Fri,  4 Jun 2021 15:03:55 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     lee.jones@...aro.org, linux@...linux.org.uk,
        catalin.marinas@....com, will@...nel.org, mark.rutland@....com,
        lorenzo.pieralisi@....com, sstabellini@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wsa+renesas@...g-engineering.com, linux@...ck-us.net,
        treding@...dia.com, arnd@...db.de, xen-devel@...ts.xenproject.org,
        patches@...linux.org.uk
Subject: [PATCH 3/5] ARM: Register with kernel restart handler

From: Guenter Roeck <linux@...ck-us.net>

By making use of the kernel restart handler, board specific restart
handlers can be prioritized amongst available mechanisms for a particular
board or system.

Select the default priority of 128 to indicate that the restart callback
in the machine description is the default restart mechanism.

Acked-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 arch/arm/kernel/setup.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 1a5edf562e85e..08c5676477d70 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1081,6 +1081,20 @@ void __init hyp_mode_check(void)
 #endif
 }
 
+static void (*__arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
+
+static int arm_restart(struct notifier_block *nb, unsigned long action,
+		       void *data)
+{
+	__arm_pm_restart(action, data);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block arm_restart_nb = {
+	.notifier_call = arm_restart,
+	.priority = 128,
+};
+
 void __init setup_arch(char **cmdline_p)
 {
 	const struct machine_desc *mdesc = NULL;
@@ -1149,8 +1163,10 @@ void __init setup_arch(char **cmdline_p)
 	kasan_init();
 	request_standard_resources(mdesc);
 
-	if (mdesc->restart)
-		arm_pm_restart = mdesc->restart;
+	if (mdesc->restart) {
+		__arm_pm_restart = mdesc->restart;
+		register_restart_handler(&arm_restart_nb);
+	}
 
 	unflatten_device_tree();
 
-- 
2.31.1