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Commit 3ef32e62 authored by Frank Munzert's avatar Frank Munzert Committed by Martin Schwidefsky
Browse files

[S390] pm: tape power management callbacks 



Signed-off-by: default avatarFrank Munzert <munzert@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 9f62fa16

drivers/s390/char/tape.h

+2 −1
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ 
 *    tape device driver for 3480/3490E/3590 tapes.

 *

 *  S390 and zSeries version

 *    Copyright IBM Corp. 2001,2006

 *    Copyright IBM Corp. 2001, 2009

 *    Author(s): Carsten Otte <cotte@de.ibm.com>

 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>

 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -286,6 +286,7 @@ extern void tape_state_set(struct tape_device *, enum tape_state); 


extern int tape_generic_online(struct tape_device *, struct tape_discipline *);

extern int tape_generic_offline(struct ccw_device *);

extern int tape_generic_pm_suspend(struct ccw_device *);



/* Externals from tape_devmap.c */

extern int tape_generic_probe(struct ccw_device *);

drivers/s390/char/tape_34xx.c

+2 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
 *  drivers/s390/char/tape_34xx.c

 *    tape device discipline for 3480/3490 tapes.

 *

 *    Copyright (C) IBM Corp. 2001,2006

 *    Copyright IBM Corp. 2001, 2009

 *    Author(s): Carsten Otte <cotte@de.ibm.com>

 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>

 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -1302,6 +1302,7 @@ static struct ccw_driver tape_34xx_driver = { 
	.remove = tape_generic_remove,

	.set_online = tape_34xx_online,

	.set_offline = tape_generic_offline,

	.freeze = tape_generic_pm_suspend,

};



static int

drivers/s390/char/tape_3590.c

+2 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
 *  drivers/s390/char/tape_3590.c

 *    tape device discipline for 3590 tapes.

 *

 *    Copyright IBM Corp. 2001,2006

 *    Copyright IBM Corp. 2001, 2009

 *    Author(s): Stefan Bader <shbader@de.ibm.com>

 *		 Michael Holzheu <holzheu@de.ibm.com>

 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -1715,6 +1715,7 @@ static struct ccw_driver tape_3590_driver = { 
	.remove = tape_generic_remove,

	.set_offline = tape_generic_offline,

	.set_online = tape_3590_online,

	.freeze = tape_generic_pm_suspend,

};



/*

drivers/s390/char/tape_core.c

+51 −1
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ 
 *    basic function of the tape device driver

 *

 *  S390 and zSeries version

 *    Copyright IBM Corp. 2001,2006

 *    Copyright IBM Corp. 2001, 2009

 *    Author(s): Carsten Otte <cotte@de.ibm.com>

 *		 Michael Holzheu <holzheu@de.ibm.com>

 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>
@@ -379,6 +379,55 @@ tape_cleanup_device(struct tape_device *device) 
	tape_med_state_set(device, MS_UNKNOWN);

}



/*

 * Suspend device.

 *

 * Called by the common I/O layer if the drive should be suspended on user

 * request. We refuse to suspend if the device is loaded or in use for the

 * following reason:

 * While the Linux guest is suspended, it might be logged off which causes

 * devices to be detached. Tape devices are automatically rewound and unloaded

 * during DETACH processing (unless the tape device was attached with the

 * NOASSIGN or MULTIUSER option). After rewind/unload, there is no way to

 * resume the original state of the tape device, since we would need to

 * manually re-load the cartridge which was active at suspend time.

 */

int tape_generic_pm_suspend(struct ccw_device *cdev)

{

	struct tape_device *device;



	device = cdev->dev.driver_data;

	if (!device) {

		return -ENODEV;

	}



	DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n",

		device->cdev_id, device);



	if (device->medium_state != MS_UNLOADED) {

		pr_err("A cartridge is loaded in tape device %s, "

		       "refusing to suspend\n", dev_name(&cdev->dev));

		return -EBUSY;

	}



	spin_lock_irq(get_ccwdev_lock(device->cdev));

	switch (device->tape_state) {

		case TS_INIT:

		case TS_NOT_OPER:

		case TS_UNUSED:

			spin_unlock_irq(get_ccwdev_lock(device->cdev));

			break;

		default:

			pr_err("Tape device %s is busy, refusing to "

			       "suspend\n", dev_name(&cdev->dev));

			spin_unlock_irq(get_ccwdev_lock(device->cdev));

			return -EBUSY;

	}



	DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id);

	return 0;

}



/*

 * Set device offline.

 *
@@ -1273,6 +1322,7 @@ EXPORT_SYMBOL(tape_generic_remove); 
EXPORT_SYMBOL(tape_generic_probe);

EXPORT_SYMBOL(tape_generic_online);

EXPORT_SYMBOL(tape_generic_offline);

EXPORT_SYMBOL(tape_generic_pm_suspend);

EXPORT_SYMBOL(tape_put_device);

EXPORT_SYMBOL(tape_get_device_reference);

EXPORT_SYMBOL(tape_state_verbose);