Commit 4b214a0c authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 6a1d96dc

drivers/s390/char/con3270.c

+6 −6
Original line number Diff line number Diff line 
/*

 *  drivers/s390/char/con3270.c

 * 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

 *     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;

drivers/s390/char/fs3270.c

+10 −6
Original line number Diff line number Diff line 
/*

 *  drivers/s390/char/fs3270.c

 * 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

 *     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. */

drivers/s390/char/raw3270.c

+73 −11
Original line number Diff line number Diff line 
/*

 *  drivers/s390/char/raw3270.c

 * 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

 *     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

drivers/s390/char/raw3270.h

+6 −6
Original line number Diff line number Diff line 
/*

 *  drivers/s390/char/raw3270.h

 * 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

 *     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.

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