Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c
new file mode 100644
index 000000000..ade721467
--- /dev/null
+++ b/drivers/s390/char/sclp_quiesce.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *     signal quiesce handler
+ *
+ *  Copyright IBM Corp. 1999, 2004
+ *  Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *             Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/cpumask.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/reboot.h>
+#include <linux/atomic.h>
+#include <asm/ptrace.h>
+#include <asm/smp.h>
+
+#include "sclp.h"
+
+/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
+static void do_machine_quiesce(void)
+{
+	psw_t quiesce_psw;
+
+	smp_send_stop();
+	quiesce_psw.mask =
+		PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT;
+	quiesce_psw.addr = 0xfff;
+	__load_psw(quiesce_psw);
+}
+
+/* Handler for quiesce event. Start shutdown procedure. */
+static void sclp_quiesce_handler(struct evbuf_header *evbuf)
+{
+	_machine_restart = (void *) do_machine_quiesce;
+	_machine_halt = do_machine_quiesce;
+	_machine_power_off = do_machine_quiesce;
+	ctrl_alt_del();
+}
+
+static struct sclp_register sclp_quiesce_event = {
+	.receive_mask = EVTYP_SIGQUIESCE_MASK,
+	.receiver_fn = sclp_quiesce_handler,
+};
+
+/* Initialize quiesce driver. */
+static int __init sclp_quiesce_init(void)
+{
+	return sclp_register(&sclp_quiesce_event);
+}
+device_initcall(sclp_quiesce_init);