diff options
Diffstat (limited to 'drivers/s390/block/dasd.c')
| -rw-r--r-- | drivers/s390/block/dasd.c | 109 |
1 files changed, 107 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 442bb98..e5b84db 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -5,8 +5,7 @@ * Carsten Otte <Cotte@de.ibm.com> * Martin Schwidefsky <schwidefsky@de.ibm.com> * Bugreports.to..: <Linux390@de.ibm.com> - * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 - * + * Copyright IBM Corp. 1999, 2009 */ #define KMSG_COMPONENT "dasd" @@ -61,6 +60,7 @@ static int dasd_flush_block_queue(struct dasd_block *); static void dasd_device_tasklet(struct dasd_device *); static void dasd_block_tasklet(struct dasd_block *); static void do_kick_device(struct work_struct *); +static void do_restore_device(struct work_struct *); static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); static void dasd_device_timeout(unsigned long); static void dasd_block_timeout(unsigned long); @@ -109,6 +109,7 @@ struct dasd_device *dasd_alloc_device(void) device->timer.function = dasd_device_timeout; device->timer.data = (unsigned long) device; INIT_WORK(&device->kick_work, do_kick_device); + INIT_WORK(&device->restore_device, do_restore_device); device->state = DASD_STATE_NEW; device->target = DASD_STATE_NEW; @@ -512,6 +513,25 @@ void dasd_kick_device(struct dasd_device *device) } /* + * dasd_restore_device will schedule a call do do_restore_device to the kernel + * event daemon. + */ +static void do_restore_device(struct work_struct *work) +{ + struct dasd_device *device = container_of(work, struct dasd_device, + restore_device); + device->cdev->drv->restore(device->cdev); + dasd_put_device(device); +} + +void dasd_restore_device(struct dasd_device *device) +{ + dasd_get_device(device); + /* queue call to dasd_restore_device to the kernel event daemon. */ + schedule_work(&device->restore_device); +} + +/* * Set the target state for a device and starts the state change. */ void dasd_set_target_state(struct dasd_device *device, int target) @@ -908,6 +928,12 @@ int dasd_start_IO(struct dasd_ccw_req *cqr) DBF_DEV_EVENT(DBF_DEBUG, device, "%s", "start_IO: -EIO device gone, retry"); break; + case -EINVAL: + /* most likely caused in power management context */ + DBF_DEV_EVENT(DBF_DEBUG, device, "%s", + "start_IO: -EINVAL device currently " + "not accessible"); + break; default: /* internal error 11 - unknown rc */ snprintf(errorstring, ERRORLENGTH, "11 %d", rc); @@ -2400,6 +2426,12 @@ int dasd_generic_notify(struct ccw_device *cdev, int event) case CIO_OPER: /* FIXME: add a sanity check. */ device->stopped &= ~DASD_STOPPED_DC_WAIT; + if (device->stopped & DASD_UNRESUMED_PM) { + device->stopped &= ~DASD_UNRESUMED_PM; + dasd_restore_device(device); + ret = 1; + break; + } dasd_schedule_device_bh(device); if (device->block) dasd_schedule_block_bh(device->block); @@ -2410,6 +2442,79 @@ int dasd_generic_notify(struct ccw_device *cdev, int event) return ret; } +int dasd_generic_pm_freeze(struct ccw_device *cdev) +{ + struct dasd_ccw_req *cqr, *n; + int rc; + struct list_head freeze_queue; + struct dasd_device *device = dasd_device_from_cdev(cdev); + + if (IS_ERR(device)) + return PTR_ERR(device); + /* disallow new I/O */ + device->stopped |= DASD_STOPPED_PM; + /* clear active requests */ + INIT_LIST_HEAD(&freeze_queue); + spin_lock_irq(get_ccwdev_lock(cdev)); + rc = 0; + list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { + /* Check status and move request to flush_queue */ + if (cqr->status == DASD_CQR_IN_IO) { + rc = device->discipline->term_IO(cqr); + if (rc) { + /* unable to terminate requeust */ + dev_err(&device->cdev->dev, + "Unable to terminate request %p " + "on suspend\n", cqr); + spin_unlock_irq(get_ccwdev_lock(cdev)); + dasd_put_device(device); + return rc; + } + } + list_move_tail(&cqr->devlist, &freeze_queue); + } + + spin_unlock_irq(get_ccwdev_lock(cdev)); + + list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { + wait_event(dasd_flush_wq, + (cqr->status != DASD_CQR_CLEAR_PENDING)); + if (cqr->status == DASD_CQR_CLEARED) + cqr->status = DASD_CQR_QUEUED; + } + /* move freeze_queue to start of the ccw_queue */ + spin_lock_irq(get_ccwdev_lock(cdev)); + list_splice_tail(&freeze_queue, &device->ccw_queue); + spin_unlock_irq(get_ccwdev_lock(cdev)); + + if (device->discipline->freeze) + rc = device->discipline->freeze(device); + + dasd_put_device(device); + return rc; +} +EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); + +int dasd_generic_restore_device(struct ccw_device *cdev) +{ + struct dasd_device *device = dasd_device_from_cdev(cdev); + int rc = 0; + + if (IS_ERR(device)) + return PTR_ERR(device); + + dasd_schedule_device_bh(device); + if (device->block) + dasd_schedule_block_bh(device->block); + + if (device->discipline->restore) + rc = device->discipline->restore(device); + + dasd_put_device(device); + return rc; +} +EXPORT_SYMBOL_GPL(dasd_generic_restore_device); + static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, void *rdc_buffer, int rdc_buffer_size, |