[S390] pm: con3270 power management callbacks.
Introduce the power management callbacks to the 3270 driver. On suspend
the current 3270 view is deactivated and for non-console 3270 device
the release callback is done. This disconnects the current tty /
fullscreen application from the 3270 device. On resume the current
view is reactivated, on the tty you get a fresh login.
If the system panics before the 3270 device has been resumed, the ccw
device for the 3270 console is reactivated with ccw_device_force_console.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c
index 0b15cf1..81c151b 100644
--- a/drivers/s390/char/raw3270.c
+++ b/drivers/s390/char/raw3270.c
@@ -1,11 +1,10 @@
/*
- * drivers/s390/char/raw3270.c
- * IBM/3270 Driver - core functions.
+ * IBM/3270 Driver - core functions.
*
- * Author(s):
- * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
- * Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
- * -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s):
+ * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
+ * Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Copyright IBM Corp. 2003, 2009
*/
#include <linux/bootmem.h>
@@ -61,6 +60,7 @@
#define RAW3270_FLAGS_ATTN 2 /* Device sent an ATTN interrupt */
#define RAW3270_FLAGS_READY 4 /* Device is useable by views */
#define RAW3270_FLAGS_CONSOLE 8 /* Device is the console. */
+#define RAW3270_FLAGS_FROZEN 16 /* set if 3270 is frozen for suspend */
/* Semaphore to protect global data of raw3270 (devices, views, etc). */
static DEFINE_MUTEX(raw3270_mutex);
@@ -306,7 +306,8 @@
spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
rp = view->dev;
- if (!rp || rp->view != view)
+ if (!rp || rp->view != view ||
+ test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
rc = -EACCES;
else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
rc = -ENODEV;
@@ -323,7 +324,8 @@
int rc;
rp = view->dev;
- if (!rp || rp->view != view)
+ if (!rp || rp->view != view ||
+ test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
rc = -EACCES;
else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
rc = -ENODEV;
@@ -764,7 +766,8 @@
int rc;
rp = view->dev;
- if (!rp || rp->view != view)
+ if (!rp || rp->view != view ||
+ test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
rc = -EACCES;
else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
rc = -ENODEV;
@@ -922,6 +925,8 @@
rc = 0;
else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
rc = -ENODEV;
+ else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
+ rc = -EACCES;
else {
oldview = NULL;
if (rp->view) {
@@ -969,7 +974,8 @@
list_del_init(&view->list);
list_add_tail(&view->list, &rp->view_list);
/* Try to activate another view. */
- if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
+ if (test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
+ !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
list_for_each_entry(view, &rp->view_list, list) {
rp->view = view;
if (view->fn->activate(view) == 0)
@@ -1068,7 +1074,8 @@
rp->view = NULL;
}
list_del_init(&view->list);
- if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
+ if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
+ !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
/* Try to activate another view. */
list_for_each_entry(nv, &rp->view_list, list) {
if (nv->fn->activate(nv) == 0) {
@@ -1337,6 +1344,58 @@
return 0;
}
+static int raw3270_pm_stop(struct ccw_device *cdev)
+{
+ struct raw3270 *rp;
+ struct raw3270_view *view;
+ unsigned long flags;
+
+ rp = cdev->dev.driver_data;
+ if (!rp)
+ return 0;
+ spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
+ if (rp->view)
+ rp->view->fn->deactivate(rp->view);
+ if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) {
+ /*
+ * Release tty and fullscreen for all non-console
+ * devices.
+ */
+ list_for_each_entry(view, &rp->view_list, list) {
+ if (view->fn->release)
+ view->fn->release(view);
+ }
+ }
+ set_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
+ spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
+ return 0;
+}
+
+static int raw3270_pm_start(struct ccw_device *cdev)
+{
+ struct raw3270 *rp;
+ unsigned long flags;
+
+ rp = cdev->dev.driver_data;
+ if (!rp)
+ return 0;
+ spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
+ clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
+ if (rp->view)
+ rp->view->fn->activate(rp->view);
+ spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
+ return 0;
+}
+
+void raw3270_pm_unfreeze(struct raw3270_view *view)
+{
+ struct raw3270 *rp;
+
+ rp = view->dev;
+ if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
+ ccw_device_force_console();
+}
+
static struct ccw_device_id raw3270_id[] = {
{ CCW_DEVICE(0x3270, 0) },
{ CCW_DEVICE(0x3271, 0) },
@@ -1360,6 +1419,9 @@
.remove = &raw3270_remove,
.set_online = &raw3270_set_online,
.set_offline = &raw3270_set_offline,
+ .freeze = &raw3270_pm_stop,
+ .thaw = &raw3270_pm_start,
+ .restore = &raw3270_pm_start,
};
static int