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[S390] pm: con3270 power management callbacks.

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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>
This commit is contained in:
Martin Schwidefsky 2009-06-16 10:30:47 +02:00
parent 6a1d96dced
commit 4b214a0c77
4 changed files with 95 additions and 29 deletions
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12
drivers/s390/char/con3270.c
View file

@ -1,11 +1,10 @@
/*
* drivers/s390/char/con3270.c
* IBM/3270 Driver - console view.
* IBM/3270 Driver - console view.
*
* 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>
@ -530,6 +529,7 @@ con3270_flush(void)
cp = condev;
if (!cp->view.dev)
return;
raw3270_pm_unfreeze(&cp->view);
spin_lock_irqsave(&cp->view.lock, flags);
con3270_wait_write(cp);
cp->nr_up = 0;

16
drivers/s390/char/fs3270.c
View file

@ -1,11 +1,10 @@
/*
* drivers/s390/char/fs3270.c
* IBM/3270 Driver - fullscreen driver.
* IBM/3270 Driver - fullscreen driver.
*
* Author(s):
* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
* Rewritten for 2.5/2.6 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 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com>
* Copyright IBM Corp. 2003, 2009
*/
#include <linux/bootmem.h>
@ -399,6 +398,11 @@ fs3270_free_view(struct raw3270_view *view)
static void
fs3270_release(struct raw3270_view *view)
{
struct fs3270 *fp;
fp = (struct fs3270 *) view;
if (fp->fs_pid)
kill_pid(fp->fs_pid, SIGHUP, 1);
}
/* View to a 3270 device. Can be console, tty or fullscreen. */

84
drivers/s390/char/raw3270.c
View file

@ -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 @@ struct raw3270 {
#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 @@ raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
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 @@ raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
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 @@ raw3270_reset(struct raw3270_view *view)
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 @@ raw3270_activate_view(struct raw3270_view *view)
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 @@ raw3270_deactivate_view(struct raw3270_view *view)
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 @@ raw3270_del_view(struct raw3270_view *view)
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 @@ raw3270_set_offline (struct ccw_device *cdev)
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 @@ static struct ccw_driver raw3270_ccw_driver = {
.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

12
drivers/s390/char/raw3270.h
View file

@ -1,11 +1,10 @@
/*
* drivers/s390/char/raw3270.h
* IBM/3270 Driver
* IBM/3270 Driver
*
* 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 <asm/idals.h>
@ -195,6 +194,7 @@ void raw3270_wait_cons_dev(struct raw3270 *);
/* Notifier for device addition/removal */
int raw3270_register_notifier(void (*notifier)(int, int));
void raw3270_unregister_notifier(void (*notifier)(int, int));
void raw3270_pm_unfreeze(struct raw3270_view *);
/*
* Little memory allocator for string objects.