aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/char
diff options
context:
space:
mode:
authorFrank Munzert <munzert@de.ibm.com>2009-06-16 04:30:39 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-16 04:31:16 -0400
commit3ef32e62cb55785f6f1b5ad7290744f74bdadaf0 (patch)
tree1ce1cfb22c145bfc1594d90a8fd117c004d68eee /drivers/s390/char
parent9f62fa1618987e9fadb2eef86d35ef168ddf5a1f (diff)
[S390] pm: tape power management callbacks
Signed-off-by: Frank Munzert <munzert@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char')
-rw-r--r--drivers/s390/char/tape.h3
-rw-r--r--drivers/s390/char/tape_34xx.c3
-rw-r--r--drivers/s390/char/tape_3590.c3
-rw-r--r--drivers/s390/char/tape_core.c52
4 files changed, 57 insertions, 4 deletions
diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h
index 5469e099597e..a26333774701 100644
--- a/drivers/s390/char/tape.h
+++ b/drivers/s390/char/tape.h
@@ -3,7 +3,7 @@
3 * tape device driver for 3480/3490E/3590 tapes. 3 * tape device driver for 3480/3490E/3590 tapes.
4 * 4 *
5 * S390 and zSeries version 5 * S390 and zSeries version
6 * Copyright IBM Corp. 2001,2006 6 * Copyright IBM Corp. 2001, 2009
7 * Author(s): Carsten Otte <cotte@de.ibm.com> 7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Tuan Ngo-Anh <ngoanh@de.ibm.com> 8 * Tuan Ngo-Anh <ngoanh@de.ibm.com>
9 * Martin Schwidefsky <schwidefsky@de.ibm.com> 9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -286,6 +286,7 @@ extern void tape_state_set(struct tape_device *, enum tape_state);
286 286
287extern int tape_generic_online(struct tape_device *, struct tape_discipline *); 287extern int tape_generic_online(struct tape_device *, struct tape_discipline *);
288extern int tape_generic_offline(struct ccw_device *); 288extern int tape_generic_offline(struct ccw_device *);
289extern int tape_generic_pm_suspend(struct ccw_device *);
289 290
290/* Externals from tape_devmap.c */ 291/* Externals from tape_devmap.c */
291extern int tape_generic_probe(struct ccw_device *); 292extern int tape_generic_probe(struct ccw_device *);
diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c
index 2d00a383a475..144d2a5e1a92 100644
--- a/drivers/s390/char/tape_34xx.c
+++ b/drivers/s390/char/tape_34xx.c
@@ -2,7 +2,7 @@
2 * drivers/s390/char/tape_34xx.c 2 * drivers/s390/char/tape_34xx.c
3 * tape device discipline for 3480/3490 tapes. 3 * tape device discipline for 3480/3490 tapes.
4 * 4 *
5 * Copyright (C) IBM Corp. 2001,2006 5 * Copyright IBM Corp. 2001, 2009
6 * Author(s): Carsten Otte <cotte@de.ibm.com> 6 * Author(s): Carsten Otte <cotte@de.ibm.com>
7 * Tuan Ngo-Anh <ngoanh@de.ibm.com> 7 * Tuan Ngo-Anh <ngoanh@de.ibm.com>
8 * Martin Schwidefsky <schwidefsky@de.ibm.com> 8 * Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -1302,6 +1302,7 @@ static struct ccw_driver tape_34xx_driver = {
1302 .remove = tape_generic_remove, 1302 .remove = tape_generic_remove,
1303 .set_online = tape_34xx_online, 1303 .set_online = tape_34xx_online,
1304 .set_offline = tape_generic_offline, 1304 .set_offline = tape_generic_offline,
1305 .freeze = tape_generic_pm_suspend,
1305}; 1306};
1306 1307
1307static int 1308static int
diff --git a/drivers/s390/char/tape_3590.c b/drivers/s390/char/tape_3590.c
index c453b2f3e9f4..23e6598bc4b5 100644
--- a/drivers/s390/char/tape_3590.c
+++ b/drivers/s390/char/tape_3590.c
@@ -2,7 +2,7 @@
2 * drivers/s390/char/tape_3590.c 2 * drivers/s390/char/tape_3590.c
3 * tape device discipline for 3590 tapes. 3 * tape device discipline for 3590 tapes.
4 * 4 *
5 * Copyright IBM Corp. 2001,2006 5 * Copyright IBM Corp. 2001, 2009
6 * Author(s): Stefan Bader <shbader@de.ibm.com> 6 * Author(s): Stefan Bader <shbader@de.ibm.com>
7 * Michael Holzheu <holzheu@de.ibm.com> 7 * Michael Holzheu <holzheu@de.ibm.com>
8 * Martin Schwidefsky <schwidefsky@de.ibm.com> 8 * Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -1715,6 +1715,7 @@ static struct ccw_driver tape_3590_driver = {
1715 .remove = tape_generic_remove, 1715 .remove = tape_generic_remove,
1716 .set_offline = tape_generic_offline, 1716 .set_offline = tape_generic_offline,
1717 .set_online = tape_3590_online, 1717 .set_online = tape_3590_online,
1718 .freeze = tape_generic_pm_suspend,
1718}; 1719};
1719 1720
1720/* 1721/*
diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c
index 8a109f3b69c6..3ebaa8eb5c86 100644
--- a/drivers/s390/char/tape_core.c
+++ b/drivers/s390/char/tape_core.c
@@ -3,7 +3,7 @@
3 * basic function of the tape device driver 3 * basic function of the tape device driver
4 * 4 *
5 * S390 and zSeries version 5 * S390 and zSeries version
6 * Copyright IBM Corp. 2001,2006 6 * Copyright IBM Corp. 2001, 2009
7 * Author(s): Carsten Otte <cotte@de.ibm.com> 7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Michael Holzheu <holzheu@de.ibm.com> 8 * Michael Holzheu <holzheu@de.ibm.com>
9 * Tuan Ngo-Anh <ngoanh@de.ibm.com> 9 * Tuan Ngo-Anh <ngoanh@de.ibm.com>
@@ -380,6 +380,55 @@ tape_cleanup_device(struct tape_device *device)
380} 380}
381 381
382/* 382/*
383 * Suspend device.
384 *
385 * Called by the common I/O layer if the drive should be suspended on user
386 * request. We refuse to suspend if the device is loaded or in use for the
387 * following reason:
388 * While the Linux guest is suspended, it might be logged off which causes
389 * devices to be detached. Tape devices are automatically rewound and unloaded
390 * during DETACH processing (unless the tape device was attached with the
391 * NOASSIGN or MULTIUSER option). After rewind/unload, there is no way to
392 * resume the original state of the tape device, since we would need to
393 * manually re-load the cartridge which was active at suspend time.
394 */
395int tape_generic_pm_suspend(struct ccw_device *cdev)
396{
397 struct tape_device *device;
398
399 device = cdev->dev.driver_data;
400 if (!device) {
401 return -ENODEV;
402 }
403
404 DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n",
405 device->cdev_id, device);
406
407 if (device->medium_state != MS_UNLOADED) {
408 pr_err("A cartridge is loaded in tape device %s, "
409 "refusing to suspend\n", dev_name(&cdev->dev));
410 return -EBUSY;
411 }
412
413 spin_lock_irq(get_ccwdev_lock(device->cdev));
414 switch (device->tape_state) {
415 case TS_INIT:
416 case TS_NOT_OPER:
417 case TS_UNUSED:
418 spin_unlock_irq(get_ccwdev_lock(device->cdev));
419 break;
420 default:
421 pr_err("Tape device %s is busy, refusing to "
422 "suspend\n", dev_name(&cdev->dev));
423 spin_unlock_irq(get_ccwdev_lock(device->cdev));
424 return -EBUSY;
425 }
426
427 DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id);
428 return 0;
429}
430
431/*
383 * Set device offline. 432 * Set device offline.
384 * 433 *
385 * Called by the common I/O layer if the drive should set offline on user 434 * Called by the common I/O layer if the drive should set offline on user
@@ -1273,6 +1322,7 @@ EXPORT_SYMBOL(tape_generic_remove);
1273EXPORT_SYMBOL(tape_generic_probe); 1322EXPORT_SYMBOL(tape_generic_probe);
1274EXPORT_SYMBOL(tape_generic_online); 1323EXPORT_SYMBOL(tape_generic_online);
1275EXPORT_SYMBOL(tape_generic_offline); 1324EXPORT_SYMBOL(tape_generic_offline);
1325EXPORT_SYMBOL(tape_generic_pm_suspend);
1276EXPORT_SYMBOL(tape_put_device); 1326EXPORT_SYMBOL(tape_put_device);
1277EXPORT_SYMBOL(tape_get_device_reference); 1327EXPORT_SYMBOL(tape_get_device_reference);
1278EXPORT_SYMBOL(tape_state_verbose); 1328EXPORT_SYMBOL(tape_state_verbose);