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!
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
new file mode 100644
index 0000000..9b7f6f5
--- /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);