Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1250 insertions, 0 deletions

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
new file mode 100644
index 00000000000..9b7f6f548b1
--- /dev/null
+++ b/drivers/s390/cio/device_fsm.c
@@ -0,0 +1,1250 @@
+/*
+ * drivers/s390/cio/device_fsm.c
+ * finite state machine for device handling
+ *
+ *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
+ *			 IBM Corporation
+ *    Author(s): Cornelia Huck(cohuck@de.ibm.com)
+ *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/init.h>
+
+#include <asm/ccwdev.h>
+#include <asm/qdio.h>
+
+#include "cio.h"
+#include "cio_debug.h"
+#include "css.h"
+#include "device.h"
+#include "chsc.h"
+#include "ioasm.h"
+#include "qdio.h"
+
+int
+device_is_online(struct subchannel *sch)
+{
+	struct ccw_device *cdev;
+
+	if (!sch->dev.driver_data)
+		return 0;
+	cdev = sch->dev.driver_data;
+	return (cdev->private->state == DEV_STATE_ONLINE);
+}
+
+int
+device_is_disconnected(struct subchannel *sch)
+{
+	struct ccw_device *cdev;
+
+	if (!sch->dev.driver_data)
+		return 0;
+	cdev = sch->dev.driver_data;
+	return (cdev->private->state == DEV_STATE_DISCONNECTED ||
+		cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
+}
+
+void
+device_set_disconnected(struct subchannel *sch)
+{
+	struct ccw_device *cdev;
+
+	if (!sch->dev.driver_data)
+		return;
+	cdev = sch->dev.driver_data;
+	ccw_device_set_timeout(cdev, 0);
+	cdev->private->flags.fake_irb = 0;
+	cdev->private->state = DEV_STATE_DISCONNECTED;
+}
+
+void
+device_set_waiting(struct subchannel *sch)
+{
+	struct ccw_device *cdev;
+
+	if (!sch->dev.driver_data)
+		return;
+	cdev = sch->dev.driver_data;
+	ccw_device_set_timeout(cdev, 10*HZ);
+	cdev->private->state = DEV_STATE_WAIT4IO;
+}
+
+/*
+ * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
+ */
+static void
+ccw_device_timeout(unsigned long data)
+{
+	struct ccw_device *cdev;
+
+	cdev = (struct ccw_device *) data;
+	spin_lock_irq(cdev->ccwlock);
+	dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
+	spin_unlock_irq(cdev->ccwlock);
+}
+
+/*
+ * Set timeout
+ */
+void
+ccw_device_set_timeout(struct ccw_device *cdev, int expires)
+{
+	if (expires == 0) {
+		del_timer(&cdev->private->timer);
+		return;
+	}
+	if (timer_pending(&cdev->private->timer)) {
+		if (mod_timer(&cdev->private->timer, jiffies + expires))
+			return;
+	}
+	cdev->private->timer.function = ccw_device_timeout;
+	cdev->private->timer.data = (unsigned long) cdev;
+	cdev->private->timer.expires = jiffies + expires;
+	add_timer(&cdev->private->timer);
+}
+
+/* Kill any pending timers after machine check. */
+void
+device_kill_pending_timer(struct subchannel *sch)
+{
+	struct ccw_device *cdev;
+
+	if (!sch->dev.driver_data)
+		return;
+	cdev = sch->dev.driver_data;
+	ccw_device_set_timeout(cdev, 0);
+}
+
+/*
+ * Cancel running i/o. This is called repeatedly since halt/clear are
+ * asynchronous operations. We do one try with cio_cancel, two tries
+ * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
+ * Returns 0 if device now idle, -ENODEV for device not operational and
+ * -EBUSY if an interrupt is expected (either from halt/clear or from a
+ * status pending).
+ */
+int
+ccw_device_cancel_halt_clear(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+	int ret;
+
+	sch = to_subchannel(cdev->dev.parent);
+	ret = stsch(sch->irq, &sch->schib);
+	if (ret || !sch->schib.pmcw.dnv)
+		return -ENODEV; 
+	if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
+		/* Not operational or no activity -> done. */
+		return 0;
+	/* Stage 1: cancel io. */
+	if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
+	    !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
+		ret = cio_cancel(sch);
+		if (ret != -EINVAL)
+			return ret;
+		/* cancel io unsuccessful. From now on it is asynchronous. */
+		cdev->private->iretry = 3;	/* 3 halt retries. */
+	}
+	if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
+		/* Stage 2: halt io. */
+		if (cdev->private->iretry) {
+			cdev->private->iretry--;
+			ret = cio_halt(sch);
+			return (ret == 0) ? -EBUSY : ret;
+		}
+		/* halt io unsuccessful. */
+		cdev->private->iretry = 255;	/* 255 clear retries. */
+	}
+	/* Stage 3: clear io. */
+	if (cdev->private->iretry) {
+		cdev->private->iretry--;
+		ret = cio_clear (sch);
+		return (ret == 0) ? -EBUSY : ret;
+	}
+	panic("Can't stop i/o on subchannel.\n");
+}
+
+static int
+ccw_device_handle_oper(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	cdev->private->flags.recog_done = 1;
+	/*
+	 * Check if cu type and device type still match. If
+	 * not, it is certainly another device and we have to
+	 * de- and re-register. Also check here for non-matching devno.
+	 */
+	if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
+	    cdev->id.cu_model != cdev->private->senseid.cu_model ||
+	    cdev->id.dev_type != cdev->private->senseid.dev_type ||
+	    cdev->id.dev_model != cdev->private->senseid.dev_model ||
+	    cdev->private->devno != sch->schib.pmcw.dev) {
+		PREPARE_WORK(&cdev->private->kick_work,
+			     ccw_device_do_unreg_rereg, (void *)cdev);
+		queue_work(ccw_device_work, &cdev->private->kick_work);
+		return 0;
+	}
+	cdev->private->flags.donotify = 1;
+	return 1;
+}
+
+/*
+ * The machine won't give us any notification by machine check if a chpid has
+ * been varied online on the SE so we have to find out by magic (i. e. driving
+ * the channel subsystem to device selection and updating our path masks).
+ */
+static inline void
+__recover_lost_chpids(struct subchannel *sch, int old_lpm)
+{
+	int mask, i;
+
+	for (i = 0; i<8; i++) {
+		mask = 0x80 >> i;
+		if (!(sch->lpm & mask))
+			continue;
+		if (old_lpm & mask)
+			continue;
+		chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
+	}
+}
+
+/*
+ * Stop device recognition.
+ */
+static void
+ccw_device_recog_done(struct ccw_device *cdev, int state)
+{
+	struct subchannel *sch;
+	int notify, old_lpm, same_dev;
+
+	sch = to_subchannel(cdev->dev.parent);
+
+	ccw_device_set_timeout(cdev, 0);
+	cio_disable_subchannel(sch);
+	/*
+	 * Now that we tried recognition, we have performed device selection
+	 * through ssch() and the path information is up to date.
+	 */
+	old_lpm = sch->lpm;
+	stsch(sch->irq, &sch->schib);
+	sch->lpm = sch->schib.pmcw.pim &
+		sch->schib.pmcw.pam &
+		sch->schib.pmcw.pom &
+		sch->opm;
+	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
+		/* Force reprobe on all chpids. */
+		old_lpm = 0;
+	if (sch->lpm != old_lpm)
+		__recover_lost_chpids(sch, old_lpm);
+	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
+		if (state == DEV_STATE_NOT_OPER) {
+			cdev->private->flags.recog_done = 1;
+			cdev->private->state = DEV_STATE_DISCONNECTED;
+			return;
+		}
+		/* Boxed devices don't need extra treatment. */
+	}
+	notify = 0;
+	same_dev = 0; /* Keep the compiler quiet... */
+	switch (state) {
+	case DEV_STATE_NOT_OPER:
+		CIO_DEBUG(KERN_WARNING, 2,
+			  "SenseID : unknown device %04x on subchannel %04x\n",
+			  cdev->private->devno, sch->irq);
+		break;
+	case DEV_STATE_OFFLINE:
+		if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
+			same_dev = ccw_device_handle_oper(cdev);
+			notify = 1;
+		}
+		/* fill out sense information */
+		cdev->id = (struct ccw_device_id) {
+			.cu_type   = cdev->private->senseid.cu_type,
+			.cu_model  = cdev->private->senseid.cu_model,
+			.dev_type  = cdev->private->senseid.dev_type,
+			.dev_model = cdev->private->senseid.dev_model,
+		};
+		if (notify) {
+			cdev->private->state = DEV_STATE_OFFLINE;
+			if (same_dev) {
+				/* Get device online again. */
+				ccw_device_online(cdev);
+				wake_up(&cdev->private->wait_q);
+			}
+			return;
+		}
+		/* Issue device info message. */
+		CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: "
+			  "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
+			  "%04X/%02X\n", cdev->private->devno,
+			  cdev->id.cu_type, cdev->id.cu_model,
+			  cdev->id.dev_type, cdev->id.dev_model);
+		break;
+	case DEV_STATE_BOXED:
+		CIO_DEBUG(KERN_WARNING, 2,
+			  "SenseID : boxed device %04x on subchannel %04x\n",
+			  cdev->private->devno, sch->irq);
+		break;
+	}
+	cdev->private->state = state;
+	io_subchannel_recog_done(cdev);
+	if (state != DEV_STATE_NOT_OPER)
+		wake_up(&cdev->private->wait_q);
+}
+
+/*
+ * Function called from device_id.c after sense id has completed.
+ */
+void
+ccw_device_sense_id_done(struct ccw_device *cdev, int err)
+{
+	switch (err) {
+	case 0:
+		ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
+		break;
+	case -ETIME:		/* Sense id stopped by timeout. */
+		ccw_device_recog_done(cdev, DEV_STATE_BOXED);
+		break;
+	default:
+		ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
+		break;
+	}
+}
+
+static void
+ccw_device_oper_notify(void *data)
+{
+	struct ccw_device *cdev;
+	struct subchannel *sch;
+	int ret;
+
+	cdev = (struct ccw_device *)data;
+	sch = to_subchannel(cdev->dev.parent);
+	ret = (sch->driver && sch->driver->notify) ?
+		sch->driver->notify(&sch->dev, CIO_OPER) : 0;
+	if (!ret)
+		/* Driver doesn't want device back. */
+		ccw_device_do_unreg_rereg((void *)cdev);
+	else
+		wake_up(&cdev->private->wait_q);
+}
+
+/*
+ * Finished with online/offline processing.
+ */
+static void
+ccw_device_done(struct ccw_device *cdev, int state)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+
+	if (state != DEV_STATE_ONLINE)
+		cio_disable_subchannel(sch);
+
+	/* Reset device status. */
+	memset(&cdev->private->irb, 0, sizeof(struct irb));
+
+	cdev->private->state = state;
+
+
+	if (state == DEV_STATE_BOXED)
+		CIO_DEBUG(KERN_WARNING, 2,
+			  "Boxed device %04x on subchannel %04x\n",
+			  cdev->private->devno, sch->irq);
+
+	if (cdev->private->flags.donotify) {
+		cdev->private->flags.donotify = 0;
+		PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
+			     (void *)cdev);
+		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
+	}
+	wake_up(&cdev->private->wait_q);
+
+	if (css_init_done && state != DEV_STATE_ONLINE)
+		put_device (&cdev->dev);
+}
+
+/*
+ * Function called from device_pgid.c after sense path ground has completed.
+ */
+void
+ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	switch (err) {
+	case 0:
+		/* Start Path Group verification. */
+		sch->vpm = 0;	/* Start with no path groups set. */
+		cdev->private->state = DEV_STATE_VERIFY;
+		ccw_device_verify_start(cdev);
+		break;
+	case -ETIME:		/* Sense path group id stopped by timeout. */
+	case -EUSERS:		/* device is reserved for someone else. */
+		ccw_device_done(cdev, DEV_STATE_BOXED);
+		break;
+	case -EOPNOTSUPP: /* path grouping not supported, just set online. */
+		cdev->private->options.pgroup = 0;
+		ccw_device_done(cdev, DEV_STATE_ONLINE);
+		break;
+	default:
+		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
+		break;
+	}
+}
+
+/*
+ * Start device recognition.
+ */
+int
+ccw_device_recognition(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+	int ret;
+
+	if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
+	    (cdev->private->state != DEV_STATE_BOXED))
+		return -EINVAL;
+	sch = to_subchannel(cdev->dev.parent);
+	ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
+	if (ret != 0)
+		/* Couldn't enable the subchannel for i/o. Sick device. */
+		return ret;
+
+	/* After 60s the device recognition is considered to have failed. */
+	ccw_device_set_timeout(cdev, 60*HZ);
+
+	/*
+	 * We used to start here with a sense pgid to find out whether a device
+	 * is locked by someone else. Unfortunately, the sense pgid command
+	 * code has other meanings on devices predating the path grouping
+	 * algorithm, so we start with sense id and box the device after an
+	 * timeout (or if sense pgid during path verification detects the device
+	 * is locked, as may happen on newer devices).
+	 */
+	cdev->private->flags.recog_done = 0;
+	cdev->private->state = DEV_STATE_SENSE_ID;
+	ccw_device_sense_id_start(cdev);
+	return 0;
+}
+
+/*
+ * Handle timeout in device recognition.
+ */
+static void
+ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	int ret;
+
+	ret = ccw_device_cancel_halt_clear(cdev);
+	switch (ret) {
+	case 0:
+		ccw_device_recog_done(cdev, DEV_STATE_BOXED);
+		break;
+	case -ENODEV:
+		ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
+		break;
+	default:
+		ccw_device_set_timeout(cdev, 3*HZ);
+	}
+}
+
+
+static void
+ccw_device_nopath_notify(void *data)
+{
+	struct ccw_device *cdev;
+	struct subchannel *sch;
+	int ret;
+
+	cdev = (struct ccw_device *)data;
+	sch = to_subchannel(cdev->dev.parent);
+	/* Extra sanity. */
+	if (sch->lpm)
+		return;
+	ret = (sch->driver && sch->driver->notify) ?
+		sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
+	if (!ret) {
+		if (get_device(&sch->dev)) {
+			/* Driver doesn't want to keep device. */
+			cio_disable_subchannel(sch);
+			if (get_device(&cdev->dev)) {
+				PREPARE_WORK(&cdev->private->kick_work,
+					     ccw_device_call_sch_unregister,
+					     (void *)cdev);
+				queue_work(ccw_device_work,
+					   &cdev->private->kick_work);
+			} else
+				put_device(&sch->dev);
+		}
+	} else {
+		cio_disable_subchannel(sch);
+		ccw_device_set_timeout(cdev, 0);
+		cdev->private->flags.fake_irb = 0;
+		cdev->private->state = DEV_STATE_DISCONNECTED;
+		wake_up(&cdev->private->wait_q);
+	}
+}
+
+void
+ccw_device_verify_done(struct ccw_device *cdev, int err)
+{
+	cdev->private->flags.doverify = 0;
+	switch (err) {
+	case -EOPNOTSUPP: /* path grouping not supported, just set online. */
+		cdev->private->options.pgroup = 0;
+	case 0:
+		ccw_device_done(cdev, DEV_STATE_ONLINE);
+		/* Deliver fake irb to device driver, if needed. */
+		if (cdev->private->flags.fake_irb) {
+			memset(&cdev->private->irb, 0, sizeof(struct irb));
+			cdev->private->irb.scsw = (struct scsw) {
+				.cc = 1,
+				.fctl = SCSW_FCTL_START_FUNC,
+				.actl = SCSW_ACTL_START_PEND,
+				.stctl = SCSW_STCTL_STATUS_PEND,
+			};
+			cdev->private->flags.fake_irb = 0;
+			if (cdev->handler)
+				cdev->handler(cdev, cdev->private->intparm,
+					      &cdev->private->irb);
+			memset(&cdev->private->irb, 0, sizeof(struct irb));
+		}
+		break;
+	case -ETIME:
+		ccw_device_done(cdev, DEV_STATE_BOXED);
+		break;
+	default:
+		PREPARE_WORK(&cdev->private->kick_work,
+			     ccw_device_nopath_notify, (void *)cdev);
+		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
+		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
+		break;
+	}
+}
+
+/*
+ * Get device online.
+ */
+int
+ccw_device_online(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+	int ret;
+
+	if ((cdev->private->state != DEV_STATE_OFFLINE) &&
+	    (cdev->private->state != DEV_STATE_BOXED))
+		return -EINVAL;
+	sch = to_subchannel(cdev->dev.parent);
+	if (css_init_done && !get_device(&cdev->dev))
+		return -ENODEV;
+	ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
+	if (ret != 0) {
+		/* Couldn't enable the subchannel for i/o. Sick device. */
+		if (ret == -ENODEV)
+			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
+		return ret;
+	}
+	/* Do we want to do path grouping? */
+	if (!cdev->private->options.pgroup) {
+		/* No, set state online immediately. */
+		ccw_device_done(cdev, DEV_STATE_ONLINE);
+		return 0;
+	}
+	/* Do a SensePGID first. */
+	cdev->private->state = DEV_STATE_SENSE_PGID;
+	ccw_device_sense_pgid_start(cdev);
+	return 0;
+}
+
+void
+ccw_device_disband_done(struct ccw_device *cdev, int err)
+{
+	switch (err) {
+	case 0:
+		ccw_device_done(cdev, DEV_STATE_OFFLINE);
+		break;
+	case -ETIME:
+		ccw_device_done(cdev, DEV_STATE_BOXED);
+		break;
+	default:
+		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
+		break;
+	}
+}
+
+/*
+ * Shutdown device.
+ */
+int
+ccw_device_offline(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv)
+		return -ENODEV;
+	if (cdev->private->state != DEV_STATE_ONLINE) {
+		if (sch->schib.scsw.actl != 0)
+			return -EBUSY;
+		return -EINVAL;
+	}
+	if (sch->schib.scsw.actl != 0)
+		return -EBUSY;
+	/* Are we doing path grouping? */
+	if (!cdev->private->options.pgroup) {
+		/* No, set state offline immediately. */
+		ccw_device_done(cdev, DEV_STATE_OFFLINE);
+		return 0;
+	}
+	/* Start Set Path Group commands. */
+	cdev->private->state = DEV_STATE_DISBAND_PGID;
+	ccw_device_disband_start(cdev);
+	return 0;
+}
+
+/*
+ * Handle timeout in device online/offline process.
+ */
+static void
+ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	int ret;
+
+	ret = ccw_device_cancel_halt_clear(cdev);
+	switch (ret) {
+	case 0:
+		ccw_device_done(cdev, DEV_STATE_BOXED);
+		break;
+	case -ENODEV:
+		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
+		break;
+	default:
+		ccw_device_set_timeout(cdev, 3*HZ);
+	}
+}
+
+/*
+ * Handle not oper event in device recognition.
+ */
+static void
+ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
+}
+
+/*
+ * Handle not operational event while offline.
+ */
+static void
+ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct subchannel *sch;
+
+	cdev->private->state = DEV_STATE_NOT_OPER;
+	sch = to_subchannel(cdev->dev.parent);
+	if (get_device(&cdev->dev)) {
+		PREPARE_WORK(&cdev->private->kick_work,
+			     ccw_device_call_sch_unregister, (void *)cdev);
+		queue_work(ccw_device_work, &cdev->private->kick_work);
+	}
+	wake_up(&cdev->private->wait_q);
+}
+
+/*
+ * Handle not operational event while online.
+ */
+static void
+ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	if (sch->driver->notify &&
+	    sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
+			ccw_device_set_timeout(cdev, 0);
+			cdev->private->flags.fake_irb = 0;
+			cdev->private->state = DEV_STATE_DISCONNECTED;
+			wake_up(&cdev->private->wait_q);
+			return;
+	}
+	cdev->private->state = DEV_STATE_NOT_OPER;
+	cio_disable_subchannel(sch);
+	if (sch->schib.scsw.actl != 0) {
+		// FIXME: not-oper indication to device driver ?
+		ccw_device_call_handler(cdev);
+	}
+	if (get_device(&cdev->dev)) {
+		PREPARE_WORK(&cdev->private->kick_work,
+			     ccw_device_call_sch_unregister, (void *)cdev);
+		queue_work(ccw_device_work, &cdev->private->kick_work);
+	}
+	wake_up(&cdev->private->wait_q);
+}
+
+/*
+ * Handle path verification event.
+ */
+static void
+ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct subchannel *sch;
+
+	if (!cdev->private->options.pgroup)
+		return;
+	if (cdev->private->state == DEV_STATE_W4SENSE) {
+		cdev->private->flags.doverify = 1;
+		return;
+	}
+	sch = to_subchannel(cdev->dev.parent);
+	/*
+	 * Since we might not just be coming from an interrupt from the
+	 * subchannel we have to update the schib.
+	 */
+	stsch(sch->irq, &sch->schib);
+
+	if (sch->schib.scsw.actl != 0 ||
+	    (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
+		/*
+		 * No final status yet or final status not yet delivered
+		 * to the device driver. Can't do path verfication now,
+		 * delay until final status was delivered.
+		 */
+		cdev->private->flags.doverify = 1;
+		return;
+	}
+	/* Device is idle, we can do the path verification. */
+	cdev->private->state = DEV_STATE_VERIFY;
+	ccw_device_verify_start(cdev);
+}
+
+/*
+ * Got an interrupt for a normal io (state online).
+ */
+static void
+ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct irb *irb;
+
+	irb = (struct irb *) __LC_IRB;
+	/* Check for unsolicited interrupt. */
+	if ((irb->scsw.stctl ==
+	    		(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
+	    && (!irb->scsw.cc)) {
+		if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
+		    !irb->esw.esw0.erw.cons) {
+			/* Unit check but no sense data. Need basic sense. */
+			if (ccw_device_do_sense(cdev, irb) != 0)
+				goto call_handler_unsol;
+			memcpy(irb, &cdev->private->irb, sizeof(struct irb));
+			cdev->private->state = DEV_STATE_W4SENSE;
+			cdev->private->intparm = 0;
+			return;
+		}
+call_handler_unsol:
+		if (cdev->handler)
+			cdev->handler (cdev, 0, irb);
+		return;
+	}
+	/* Accumulate status and find out if a basic sense is needed. */
+	ccw_device_accumulate_irb(cdev, irb);
+	if (cdev->private->flags.dosense) {
+		if (ccw_device_do_sense(cdev, irb) == 0) {
+			cdev->private->state = DEV_STATE_W4SENSE;
+		}
+		return;
+	}
+	/* Call the handler. */
+	if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
+		/* Start delayed path verification. */
+		ccw_device_online_verify(cdev, 0);
+}
+
+/*
+ * Got an timeout in online state.
+ */
+static void
+ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	int ret;
+
+	ccw_device_set_timeout(cdev, 0);
+	ret = ccw_device_cancel_halt_clear(cdev);
+	if (ret == -EBUSY) {
+		ccw_device_set_timeout(cdev, 3*HZ);
+		cdev->private->state = DEV_STATE_TIMEOUT_KILL;
+		return;
+	}
+	if (ret == -ENODEV) {
+		struct subchannel *sch;
+
+		sch = to_subchannel(cdev->dev.parent);
+		if (!sch->lpm) {
+			PREPARE_WORK(&cdev->private->kick_work,
+				     ccw_device_nopath_notify, (void *)cdev);
+			queue_work(ccw_device_notify_work,
+				   &cdev->private->kick_work);
+		} else
+			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
+	} else if (cdev->handler)
+		cdev->handler(cdev, cdev->private->intparm,
+			      ERR_PTR(-ETIMEDOUT));
+}
+
+/*
+ * Got an interrupt for a basic sense.
+ */
+void
+ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct irb *irb;
+
+	irb = (struct irb *) __LC_IRB;
+	/* Check for unsolicited interrupt. */
+	if (irb->scsw.stctl ==
+	    		(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
+		if (irb->scsw.cc == 1)
+			/* Basic sense hasn't started. Try again. */
+			ccw_device_do_sense(cdev, irb);
+		else {
+			printk("Huh? %s(%s): unsolicited interrupt...\n",
+			       __FUNCTION__, cdev->dev.bus_id);
+			if (cdev->handler)
+				cdev->handler (cdev, 0, irb);
+		}
+		return;
+	}
+	/* Add basic sense info to irb. */
+	ccw_device_accumulate_basic_sense(cdev, irb);
+	if (cdev->private->flags.dosense) {
+		/* Another basic sense is needed. */
+		ccw_device_do_sense(cdev, irb);
+		return;
+	}
+	cdev->private->state = DEV_STATE_ONLINE;
+	/* Call the handler. */
+	if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
+		/* Start delayed path verification. */
+		ccw_device_online_verify(cdev, 0);
+}
+
+static void
+ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct irb *irb;
+
+	irb = (struct irb *) __LC_IRB;
+	/* Accumulate status. We don't do basic sense. */
+	ccw_device_accumulate_irb(cdev, irb);
+	/* Try to start delayed device verification. */
+	ccw_device_online_verify(cdev, 0);
+	/* Note: Don't call handler for cio initiated clear! */
+}
+
+static void
+ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	ccw_device_set_timeout(cdev, 0);
+	/* OK, i/o is dead now. Call interrupt handler. */
+	cdev->private->state = DEV_STATE_ONLINE;
+	if (cdev->handler)
+		cdev->handler(cdev, cdev->private->intparm,
+			      ERR_PTR(-ETIMEDOUT));
+	if (!sch->lpm) {
+		PREPARE_WORK(&cdev->private->kick_work,
+			     ccw_device_nopath_notify, (void *)cdev);
+		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
+	} else if (cdev->private->flags.doverify)
+		/* Start delayed path verification. */
+		ccw_device_online_verify(cdev, 0);
+}
+
+static void
+ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	int ret;
+
+	ret = ccw_device_cancel_halt_clear(cdev);
+	if (ret == -EBUSY) {
+		ccw_device_set_timeout(cdev, 3*HZ);
+		return;
+	}
+	if (ret == -ENODEV) {
+		struct subchannel *sch;
+
+		sch = to_subchannel(cdev->dev.parent);
+		if (!sch->lpm) {
+			PREPARE_WORK(&cdev->private->kick_work,
+				     ccw_device_nopath_notify, (void *)cdev);
+			queue_work(ccw_device_notify_work,
+				   &cdev->private->kick_work);
+		} else
+			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
+		return;
+	}
+	//FIXME: Can we get here?
+	cdev->private->state = DEV_STATE_ONLINE;
+	if (cdev->handler)
+		cdev->handler(cdev, cdev->private->intparm,
+			      ERR_PTR(-ETIMEDOUT));
+}
+
+static void
+ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct irb *irb;
+	struct subchannel *sch;
+
+	irb = (struct irb *) __LC_IRB;
+	/*
+	 * Accumulate status and find out if a basic sense is needed.
+	 * This is fine since we have already adapted the lpm.
+	 */
+	ccw_device_accumulate_irb(cdev, irb);
+	if (cdev->private->flags.dosense) {
+		if (ccw_device_do_sense(cdev, irb) == 0) {
+			cdev->private->state = DEV_STATE_W4SENSE;
+		}
+		return;
+	}
+
+	/* Iff device is idle, reset timeout. */
+	sch = to_subchannel(cdev->dev.parent);
+	if (!stsch(sch->irq, &sch->schib))
+		if (sch->schib.scsw.actl == 0)
+			ccw_device_set_timeout(cdev, 0);
+	/* Call the handler. */
+	ccw_device_call_handler(cdev);
+	if (!sch->lpm) {
+		PREPARE_WORK(&cdev->private->kick_work,
+			     ccw_device_nopath_notify, (void *)cdev);
+		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
+	} else if (cdev->private->flags.doverify)
+		ccw_device_online_verify(cdev, 0);
+}
+
+static void
+ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	int ret;
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	ccw_device_set_timeout(cdev, 0);
+	ret = ccw_device_cancel_halt_clear(cdev);
+	if (ret == -EBUSY) {
+		ccw_device_set_timeout(cdev, 3*HZ);
+		cdev->private->state = DEV_STATE_TIMEOUT_KILL;
+		return;
+	}
+	if (ret == -ENODEV) {
+		if (!sch->lpm) {
+			PREPARE_WORK(&cdev->private->kick_work,
+				     ccw_device_nopath_notify, (void *)cdev);
+			queue_work(ccw_device_notify_work,
+				   &cdev->private->kick_work);
+		} else
+			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
+		return;
+	}
+	if (cdev->handler)
+		cdev->handler(cdev, cdev->private->intparm,
+			      ERR_PTR(-ETIMEDOUT));
+	if (!sch->lpm) {
+		PREPARE_WORK(&cdev->private->kick_work,
+			     ccw_device_nopath_notify, (void *)cdev);
+		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
+	} else if (cdev->private->flags.doverify)
+		/* Start delayed path verification. */
+		ccw_device_online_verify(cdev, 0);
+}
+
+static void
+ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	/* When the I/O has terminated, we have to start verification. */
+	if (cdev->private->options.pgroup)
+		cdev->private->flags.doverify = 1;
+}
+
+static void
+ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct irb *irb;
+
+	switch (dev_event) {
+	case DEV_EVENT_INTERRUPT:
+		irb = (struct irb *) __LC_IRB;
+		/* Check for unsolicited interrupt. */
+		if ((irb->scsw.stctl ==
+		     (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
+		    (!irb->scsw.cc))
+			/* FIXME: we should restart stlck here, but this
+			 * is extremely unlikely ... */
+			goto out_wakeup;
+
+		ccw_device_accumulate_irb(cdev, irb);
+		/* We don't care about basic sense etc. */
+		break;
+	default: /* timeout */
+		break;
+	}
+out_wakeup:
+	wake_up(&cdev->private->wait_q);
+}
+
+static void
+ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
+		/* Couldn't enable the subchannel for i/o. Sick device. */
+		return;
+
+	/* After 60s the device recognition is considered to have failed. */
+	ccw_device_set_timeout(cdev, 60*HZ);
+
+	cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
+	ccw_device_sense_id_start(cdev);
+}
+
+void
+device_trigger_reprobe(struct subchannel *sch)
+{
+	struct ccw_device *cdev;
+
+	if (!sch->dev.driver_data)
+		return;
+	cdev = sch->dev.driver_data;
+	if (cdev->private->state != DEV_STATE_DISCONNECTED)
+		return;
+
+	/* Update some values. */
+	if (stsch(sch->irq, &sch->schib))
+		return;
+
+	/*
+	 * The pim, pam, pom values may not be accurate, but they are the best
+	 * we have before performing device selection :/
+	 */
+	sch->lpm = sch->schib.pmcw.pim &
+		sch->schib.pmcw.pam &
+		sch->schib.pmcw.pom &
+		sch->opm;
+	/* Re-set some bits in the pmcw that were lost. */
+	sch->schib.pmcw.isc = 3;
+	sch->schib.pmcw.csense = 1;
+	sch->schib.pmcw.ena = 0;
+	if ((sch->lpm & (sch->lpm - 1)) != 0)
+		sch->schib.pmcw.mp = 1;
+	sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
+	/* We should also udate ssd info, but this has to wait. */
+	ccw_device_start_id(cdev, 0);
+}
+
+static void
+ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	/*
+	 * An interrupt in state offline means a previous disable was not
+	 * successful. Try again.
+	 */
+	cio_disable_subchannel(sch);
+}
+
+static void
+ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	retry_set_schib(cdev);
+	cdev->private->state = DEV_STATE_ONLINE;
+	dev_fsm_event(cdev, dev_event);
+}
+
+
+static void
+ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	ccw_device_set_timeout(cdev, 0);
+	if (dev_event == DEV_EVENT_NOTOPER)
+		cdev->private->state = DEV_STATE_NOT_OPER;
+	else
+		cdev->private->state = DEV_STATE_OFFLINE;
+	wake_up(&cdev->private->wait_q);
+}
+
+static void
+ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	int ret;
+
+	ret = ccw_device_cancel_halt_clear(cdev);
+	switch (ret) {
+	case 0:
+		cdev->private->state = DEV_STATE_OFFLINE;
+		wake_up(&cdev->private->wait_q);
+		break;
+	case -ENODEV:
+		cdev->private->state = DEV_STATE_NOT_OPER;
+		wake_up(&cdev->private->wait_q);
+		break;
+	default:
+		ccw_device_set_timeout(cdev, HZ/10);
+	}
+}
+
+/*
+ * No operation action. This is used e.g. to ignore a timeout event in
+ * state offline.
+ */
+static void
+ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
+{
+}
+
+/*
+ * Bug operation action. 
+ */
+static void
+ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
+	       cdev->private->state, dev_event);
+	BUG();
+}
+
+/*
+ * device statemachine
+ */
+fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
+	[DEV_STATE_NOT_OPER] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_nop,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_bug,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_SENSE_PGID] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_pgid_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_SENSE_ID] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_recog_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_id_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_recog_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_OFFLINE] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_offline_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_offline_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_VERIFY] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_verify_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_ONLINE] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_online_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_online_verify,
+	},
+	[DEV_STATE_W4SENSE] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_w4sense,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
+		[DEV_EVENT_VERIFY]	= ccw_device_online_verify,
+	},
+	[DEV_STATE_DISBAND_PGID] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_disband_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_BOXED] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_offline_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_stlck_done,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_stlck_done,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	/* states to wait for i/o completion before doing something */
+	[DEV_STATE_CLEAR_VERIFY] = {
+		[DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_TIMEOUT_KILL] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_killing_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_killing_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop, //FIXME
+	},
+	[DEV_STATE_WAIT4IO] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_wait4io_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_wait4io_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_wait4io_verify,
+	},
+	[DEV_STATE_QUIESCE] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_quiesce_done,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_quiesce_done,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_quiesce_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	/* special states for devices gone not operational */
+	[DEV_STATE_DISCONNECTED] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_nop,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_start_id,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_bug,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_DISCONNECTED_SENSE_ID] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_recog_notoper,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_id_irq,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_recog_timeout,
+		[DEV_EVENT_VERIFY]	= ccw_device_nop,
+	},
+	[DEV_STATE_CMFCHANGE] = {
+		[DEV_EVENT_NOTOPER]	= ccw_device_change_cmfstate,
+		[DEV_EVENT_INTERRUPT]	= ccw_device_change_cmfstate,
+		[DEV_EVENT_TIMEOUT]	= ccw_device_change_cmfstate,
+		[DEV_EVENT_VERIFY]	= ccw_device_change_cmfstate,
+	},
+};
+
+/*
+ * io_subchannel_irq is called for "real" interrupts or for status
+ * pending conditions on msch.
+ */
+void
+io_subchannel_irq (struct device *pdev)
+{
+	struct ccw_device *cdev;
+
+	cdev = to_subchannel(pdev)->dev.driver_data;
+
+	CIO_TRACE_EVENT (3, "IRQ");
+	CIO_TRACE_EVENT (3, pdev->bus_id);
+	if (cdev)
+		dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
+}
+
+EXPORT_SYMBOL_GPL(ccw_device_set_timeout);