s390/cio: remove pm support from ccw bus driver

As part of removing broken pm-support from s390 arch, remove
the pm callbacks from ccw-bus driver.The power-management functions
are unused since the 'commit 39421627 ("s390: remove broken
hibernate / power management support")'.
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/include/asm/ccwdev.h

@@ -124,11 +124,6 @@ enum uc_todo {
  * @notify: notify driver of device state changes
  * @path_event: notify driver of channel path events
  * @shutdown: called at device shutdown
- * @prepare: prepare for pm state transition
- * @complete: undo work done in @prepare
- * @freeze: callback for freezing during hibernation snapshotting
- * @thaw: undo work done in @freeze
- * @restore: callback for restoring after hibernation
  * @uc_handler: callback for unit check handler
  * @driver: embedded device driver structure
  * @int_class: interruption class to use for accounting interrupts
@@ -142,11 +137,6 @@ struct ccw_driver {
 	int (*notify) (struct ccw_device *, int);
 	void (*path_event) (struct ccw_device *, int *);
 	void (*shutdown) (struct ccw_device *);
-	int (*prepare) (struct ccw_device *);
-	void (*complete) (struct ccw_device *);
-	int (*freeze)(struct ccw_device *);
-	int (*thaw) (struct ccw_device *);
-	int (*restore)(struct ccw_device *);
 	enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
 	struct device_driver driver;
 	enum interruption_class int_class;

drivers/s390/cio/cmf.c

@@ -1109,11 +1109,6 @@ static ssize_t cmb_enable_store(struct device *dev,
 }
 DEVICE_ATTR_RW(cmb_enable);
 
-int ccw_set_cmf(struct ccw_device *cdev, int enable)
-{
-	return cmbops->set(cdev, enable ? 2 : 0);
-}
-
 /**
  * enable_cmf() - switch on the channel measurement for a specific device
  *  @cdev:	The ccw device to be enabled

drivers/s390/cio/device.c

@@ -1408,7 +1408,7 @@ static enum io_sch_action sch_get_action(struct subchannel *sch)
 	}
 	if (device_is_disconnected(cdev))
 		return IO_SCH_REPROBE;
-	if (cdev->online && !cdev->private->flags.resuming)
+	if (cdev->online)
 		return IO_SCH_VERIFY;
 	if (cdev->private->state == DEV_STATE_NOT_OPER)
 		return IO_SCH_UNREG_ATTACH;
@@ -1500,11 +1500,6 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
 		break;
 	case IO_SCH_UNREG_ATTACH:
 		spin_lock_irqsave(sch->lock, flags);
-		if (cdev->private->flags.resuming) {
-			/* Device will be handled later. */
-			rc = 0;
-			goto out_unlock;
-		}
 		sch_set_cdev(sch, NULL);
 		spin_unlock_irqrestore(sch->lock, flags);
 		/* Unregister ccw device. */
@@ -1517,7 +1512,7 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
 	switch (action) {
 	case IO_SCH_ORPH_UNREG:
 	case IO_SCH_UNREG:
-		if (!cdev || !cdev->private->flags.resuming)
+		if (!cdev)
 			css_sch_device_unregister(sch);
 		break;
 	case IO_SCH_ORPH_ATTACH:
@@ -1676,14 +1671,6 @@ void ccw_device_wait_idle(struct ccw_device *cdev)
 		udelay_simple(100);
 	}
 }
-
-static int ccw_device_pm_restore(struct device *dev);
-
-int ccw_device_force_console(struct ccw_device *cdev)
-{
-	return ccw_device_pm_restore(&cdev->dev);
-}
-EXPORT_SYMBOL_GPL(ccw_device_force_console);
 #endif
 
 /**
@@ -1784,235 +1771,6 @@ static void ccw_device_shutdown(struct device *dev)
 	__disable_cmf(cdev);
 }
 
-static int ccw_device_pm_prepare(struct device *dev)
-{
-	struct ccw_device *cdev = to_ccwdev(dev);
-
-	if (work_pending(&cdev->private->todo_work))
-		return -EAGAIN;
-	/* Fail while device is being set online/offline. */
-	if (atomic_read(&cdev->private->onoff))
-		return -EAGAIN;
-
-	if (cdev->online && cdev->drv && cdev->drv->prepare)
-		return cdev->drv->prepare(cdev);
-
-	return 0;
-}
-
-static void ccw_device_pm_complete(struct device *dev)
-{
-	struct ccw_device *cdev = to_ccwdev(dev);
-
-	if (cdev->online && cdev->drv && cdev->drv->complete)
-		cdev->drv->complete(cdev);
-}
-
-static int ccw_device_pm_freeze(struct device *dev)
-{
-	struct ccw_device *cdev = to_ccwdev(dev);
-	struct subchannel *sch = to_subchannel(cdev->dev.parent);
-	int ret, cm_enabled;
-
-	/* Fail suspend while device is in transistional state. */
-	if (!dev_fsm_final_state(cdev))
-		return -EAGAIN;
-	if (!cdev->online)
-		return 0;
-	if (cdev->drv && cdev->drv->freeze) {
-		ret = cdev->drv->freeze(cdev);
-		if (ret)
-			return ret;
-	}
-
-	spin_lock_irq(sch->lock);
-	cm_enabled = cdev->private->cmb != NULL;
-	spin_unlock_irq(sch->lock);
-	if (cm_enabled) {
-		/* Don't have the css write on memory. */
-		ret = ccw_set_cmf(cdev, 0);
-		if (ret)
-			return ret;
-	}
-	/* From here on, disallow device driver I/O. */
-	spin_lock_irq(sch->lock);
-	ret = cio_disable_subchannel(sch);
-	spin_unlock_irq(sch->lock);
-
-	return ret;
-}
-
-static int ccw_device_pm_thaw(struct device *dev)
-{
-	struct ccw_device *cdev = to_ccwdev(dev);
-	struct subchannel *sch = to_subchannel(cdev->dev.parent);
-	int ret, cm_enabled;
-
-	if (!cdev->online)
-		return 0;
-
-	spin_lock_irq(sch->lock);
-	/* Allow device driver I/O again. */
-	ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
-	cm_enabled = cdev->private->cmb != NULL;
-	spin_unlock_irq(sch->lock);
-	if (ret)
-		return ret;
-
-	if (cm_enabled) {
-		ret = ccw_set_cmf(cdev, 1);
-		if (ret)
-			return ret;
-	}
-
-	if (cdev->drv && cdev->drv->thaw)
-		ret = cdev->drv->thaw(cdev);
-
-	return ret;
-}
-
-static void __ccw_device_pm_restore(struct ccw_device *cdev)
-{
-	struct subchannel *sch = to_subchannel(cdev->dev.parent);
-
-	spin_lock_irq(sch->lock);
-	if (cio_is_console(sch->schid)) {
-		cio_enable_subchannel(sch, (u32)(addr_t)sch);
-		goto out_unlock;
-	}
-	/*
-	 * While we were sleeping, devices may have gone or become
-	 * available again. Kick re-detection.
-	 */
-	cdev->private->flags.resuming = 1;
-	cdev->private->path_new_mask = LPM_ANYPATH;
-	css_sched_sch_todo(sch, SCH_TODO_EVAL);
-	spin_unlock_irq(sch->lock);
-	css_wait_for_slow_path();
-
-	/* cdev may have been moved to a different subchannel. */
-	sch = to_subchannel(cdev->dev.parent);
-	spin_lock_irq(sch->lock);
-	if (cdev->private->state != DEV_STATE_ONLINE &&
-	    cdev->private->state != DEV_STATE_OFFLINE)
-		goto out_unlock;
-
-	ccw_device_recognition(cdev);
-	spin_unlock_irq(sch->lock);
-	wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
-		   cdev->private->state == DEV_STATE_DISCONNECTED);
-	spin_lock_irq(sch->lock);
-
-out_unlock:
-	cdev->private->flags.resuming = 0;
-	spin_unlock_irq(sch->lock);
-}
-
-static int resume_handle_boxed(struct ccw_device *cdev)
-{
-	cdev->private->state = DEV_STATE_BOXED;
-	if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK)
-		return 0;
-	ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
-	return -ENODEV;
-}
-
-static int resume_handle_disc(struct ccw_device *cdev)
-{
-	cdev->private->state = DEV_STATE_DISCONNECTED;
-	if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK)
-		return 0;
-	ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
-	return -ENODEV;
-}
-
-static int ccw_device_pm_restore(struct device *dev)
-{
-	struct ccw_device *cdev = to_ccwdev(dev);
-	struct subchannel *sch;
-	int ret = 0;
-
-	__ccw_device_pm_restore(cdev);
-	sch = to_subchannel(cdev->dev.parent);
-	spin_lock_irq(sch->lock);
-	if (cio_is_console(sch->schid))
-		goto out_restore;
-
-	/* check recognition results */
-	switch (cdev->private->state) {
-	case DEV_STATE_OFFLINE:
-	case DEV_STATE_ONLINE:
-		cdev->private->flags.donotify = 0;
-		break;
-	case DEV_STATE_BOXED:
-		ret = resume_handle_boxed(cdev);
-		if (ret)
-			goto out_unlock;
-		goto out_restore;
-	default:
-		ret = resume_handle_disc(cdev);
-		if (ret)
-			goto out_unlock;
-		goto out_restore;
-	}
-	/* check if the device type has changed */
-	if (!ccw_device_test_sense_data(cdev)) {
-		ccw_device_update_sense_data(cdev);
-		ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
-		ret = -ENODEV;
-		goto out_unlock;
-	}
-	if (!cdev->online)
-		goto out_unlock;
-
-	if (ccw_device_online(cdev)) {
-		ret = resume_handle_disc(cdev);
-		if (ret)
-			goto out_unlock;
-		goto out_restore;
-	}
-	spin_unlock_irq(sch->lock);
-	wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
-	spin_lock_irq(sch->lock);
-
-	if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) {
-		ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
-		ret = -ENODEV;
-		goto out_unlock;
-	}
-
-	/* reenable cmf, if needed */
-	if (cdev->private->cmb) {
-		spin_unlock_irq(sch->lock);
-		ret = ccw_set_cmf(cdev, 1);
-		spin_lock_irq(sch->lock);
-		if (ret) {
-			CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
-				      "(rc=%d)\n", cdev->private->dev_id.ssid,
-				      cdev->private->dev_id.devno, ret);
-			ret = 0;
-		}
-	}
-
-out_restore:
-	spin_unlock_irq(sch->lock);
-	if (cdev->online && cdev->drv && cdev->drv->restore)
-		ret = cdev->drv->restore(cdev);
-	return ret;
-
-out_unlock:
-	spin_unlock_irq(sch->lock);
-	return ret;
-}
-
-static const struct dev_pm_ops ccw_pm_ops = {
-	.prepare = ccw_device_pm_prepare,
-	.complete = ccw_device_pm_complete,
-	.freeze = ccw_device_pm_freeze,
-	.thaw = ccw_device_pm_thaw,
-	.restore = ccw_device_pm_restore,
-};
-
 static struct bus_type ccw_bus_type = {
 	.name   = "ccw",
 	.match  = ccw_bus_match,
@@ -2020,7 +1778,6 @@ static struct bus_type ccw_bus_type = {
 	.probe  = ccw_device_probe,
 	.remove = ccw_device_remove,
 	.shutdown = ccw_device_shutdown,
-	.pm = &ccw_pm_ops,
 };
 
 /**

drivers/s390/cio/device.h

@@ -143,6 +143,5 @@ void retry_set_schib(struct ccw_device *cdev);
 void cmf_retry_copy_block(struct ccw_device *);
 int cmf_reenable(struct ccw_device *);
 void cmf_reactivate(void);
-int ccw_set_cmf(struct ccw_device *cdev, int enable);
 extern struct device_attribute dev_attr_cmb_enable;
 #endif

drivers/s390/cio/device_fsm.c

@@ -224,12 +224,6 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
 		wake_up(&cdev->private->wait_q);
 		return;
 	}
-	if (cdev->private->flags.resuming) {
-		cdev->private->state = state;
-		cdev->private->flags.recog_done = 1;
-		wake_up(&cdev->private->wait_q);
-		return;
-	}
 	switch (state) {
 	case DEV_STATE_NOT_OPER:
 		break;

drivers/s390/cio/io_sch.h

@@ -160,7 +160,6 @@ struct ccw_device_private {
 		unsigned int donotify:1;    /* call notify function */
 		unsigned int recog_done:1;  /* dev. recog. complete */
 		unsigned int fake_irb:2;    /* deliver faked irb */
-		unsigned int resuming:1;    /* recognition while resume */
 		unsigned int pgroup:1;	    /* pathgroup is set up */
 		unsigned int mpath:1;	    /* multipathing is set up */
 		unsigned int pgid_unknown:1;/* unknown pgid state */