4c24da79e2
Common i/o layer changes: - Collect the irb at the correct subchannel when waiting for the clear interrupt during subchannel cleaning befor reIPL - don't stop at the first interrupt that comes in. - Change "extern __inline__" to "static inline". - Remove unneeded qdio includes. Signed-off-by: Cornelia Huck <cohuck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1253 lines
33 KiB
C
1253 lines
33 KiB
C
/*
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* drivers/s390/cio/device_fsm.c
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* finite state machine for device handling
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Cornelia Huck(cohuck@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <linux/module.h>
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#include <linux/config.h>
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#include <linux/init.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include "cio.h"
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#include "cio_debug.h"
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#include "css.h"
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#include "device.h"
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#include "chsc.h"
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#include "ioasm.h"
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int
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device_is_online(struct subchannel *sch)
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{
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struct ccw_device *cdev;
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if (!sch->dev.driver_data)
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return 0;
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cdev = sch->dev.driver_data;
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return (cdev->private->state == DEV_STATE_ONLINE);
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}
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int
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device_is_disconnected(struct subchannel *sch)
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{
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struct ccw_device *cdev;
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if (!sch->dev.driver_data)
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return 0;
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cdev = sch->dev.driver_data;
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return (cdev->private->state == DEV_STATE_DISCONNECTED ||
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cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
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}
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void
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device_set_disconnected(struct subchannel *sch)
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{
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struct ccw_device *cdev;
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if (!sch->dev.driver_data)
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return;
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cdev = sch->dev.driver_data;
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ccw_device_set_timeout(cdev, 0);
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cdev->private->flags.fake_irb = 0;
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cdev->private->state = DEV_STATE_DISCONNECTED;
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}
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void
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device_set_waiting(struct subchannel *sch)
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{
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struct ccw_device *cdev;
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if (!sch->dev.driver_data)
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return;
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cdev = sch->dev.driver_data;
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ccw_device_set_timeout(cdev, 10*HZ);
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cdev->private->state = DEV_STATE_WAIT4IO;
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}
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/*
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* Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
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*/
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static void
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ccw_device_timeout(unsigned long data)
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{
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struct ccw_device *cdev;
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cdev = (struct ccw_device *) data;
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spin_lock_irq(cdev->ccwlock);
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dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
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spin_unlock_irq(cdev->ccwlock);
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}
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/*
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* Set timeout
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*/
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void
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ccw_device_set_timeout(struct ccw_device *cdev, int expires)
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{
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if (expires == 0) {
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del_timer(&cdev->private->timer);
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return;
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}
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if (timer_pending(&cdev->private->timer)) {
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if (mod_timer(&cdev->private->timer, jiffies + expires))
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return;
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}
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cdev->private->timer.function = ccw_device_timeout;
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cdev->private->timer.data = (unsigned long) cdev;
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cdev->private->timer.expires = jiffies + expires;
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add_timer(&cdev->private->timer);
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}
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/* Kill any pending timers after machine check. */
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void
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device_kill_pending_timer(struct subchannel *sch)
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{
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struct ccw_device *cdev;
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if (!sch->dev.driver_data)
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return;
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cdev = sch->dev.driver_data;
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ccw_device_set_timeout(cdev, 0);
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}
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/*
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* Cancel running i/o. This is called repeatedly since halt/clear are
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* asynchronous operations. We do one try with cio_cancel, two tries
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* with cio_halt, 255 tries with cio_clear. If everythings fails panic.
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* Returns 0 if device now idle, -ENODEV for device not operational and
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* -EBUSY if an interrupt is expected (either from halt/clear or from a
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* status pending).
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*/
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int
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ccw_device_cancel_halt_clear(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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int ret;
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sch = to_subchannel(cdev->dev.parent);
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ret = stsch(sch->irq, &sch->schib);
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if (ret || !sch->schib.pmcw.dnv)
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return -ENODEV;
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if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
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/* Not operational or no activity -> done. */
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return 0;
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/* Stage 1: cancel io. */
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if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
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!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
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ret = cio_cancel(sch);
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if (ret != -EINVAL)
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return ret;
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/* cancel io unsuccessful. From now on it is asynchronous. */
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cdev->private->iretry = 3; /* 3 halt retries. */
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}
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if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
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/* Stage 2: halt io. */
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if (cdev->private->iretry) {
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cdev->private->iretry--;
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ret = cio_halt(sch);
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return (ret == 0) ? -EBUSY : ret;
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}
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/* halt io unsuccessful. */
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cdev->private->iretry = 255; /* 255 clear retries. */
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}
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/* Stage 3: clear io. */
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if (cdev->private->iretry) {
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cdev->private->iretry--;
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ret = cio_clear (sch);
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return (ret == 0) ? -EBUSY : ret;
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}
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panic("Can't stop i/o on subchannel.\n");
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}
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static int
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ccw_device_handle_oper(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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cdev->private->flags.recog_done = 1;
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/*
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* Check if cu type and device type still match. If
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* not, it is certainly another device and we have to
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* de- and re-register. Also check here for non-matching devno.
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*/
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if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
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cdev->id.cu_model != cdev->private->senseid.cu_model ||
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cdev->id.dev_type != cdev->private->senseid.dev_type ||
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cdev->id.dev_model != cdev->private->senseid.dev_model ||
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cdev->private->devno != sch->schib.pmcw.dev) {
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PREPARE_WORK(&cdev->private->kick_work,
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ccw_device_do_unreg_rereg, (void *)cdev);
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queue_work(ccw_device_work, &cdev->private->kick_work);
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return 0;
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}
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cdev->private->flags.donotify = 1;
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return 1;
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}
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/*
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* The machine won't give us any notification by machine check if a chpid has
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* been varied online on the SE so we have to find out by magic (i. e. driving
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* the channel subsystem to device selection and updating our path masks).
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*/
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static inline void
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__recover_lost_chpids(struct subchannel *sch, int old_lpm)
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{
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int mask, i;
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for (i = 0; i<8; i++) {
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mask = 0x80 >> i;
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if (!(sch->lpm & mask))
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continue;
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if (old_lpm & mask)
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continue;
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chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
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}
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}
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/*
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* Stop device recognition.
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*/
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static void
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ccw_device_recog_done(struct ccw_device *cdev, int state)
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{
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struct subchannel *sch;
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int notify, old_lpm, same_dev;
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sch = to_subchannel(cdev->dev.parent);
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ccw_device_set_timeout(cdev, 0);
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cio_disable_subchannel(sch);
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/*
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* Now that we tried recognition, we have performed device selection
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* through ssch() and the path information is up to date.
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*/
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old_lpm = sch->lpm;
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stsch(sch->irq, &sch->schib);
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sch->lpm = sch->schib.pmcw.pim &
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sch->schib.pmcw.pam &
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sch->schib.pmcw.pom &
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sch->opm;
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/* Check since device may again have become not operational. */
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if (!sch->schib.pmcw.dnv)
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state = DEV_STATE_NOT_OPER;
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if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
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/* Force reprobe on all chpids. */
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old_lpm = 0;
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if (sch->lpm != old_lpm)
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__recover_lost_chpids(sch, old_lpm);
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if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
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if (state == DEV_STATE_NOT_OPER) {
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cdev->private->flags.recog_done = 1;
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cdev->private->state = DEV_STATE_DISCONNECTED;
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return;
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}
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/* Boxed devices don't need extra treatment. */
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}
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notify = 0;
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same_dev = 0; /* Keep the compiler quiet... */
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switch (state) {
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case DEV_STATE_NOT_OPER:
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CIO_DEBUG(KERN_WARNING, 2,
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"SenseID : unknown device %04x on subchannel %04x\n",
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cdev->private->devno, sch->irq);
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break;
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case DEV_STATE_OFFLINE:
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if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
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same_dev = ccw_device_handle_oper(cdev);
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notify = 1;
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}
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/* fill out sense information */
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cdev->id = (struct ccw_device_id) {
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.cu_type = cdev->private->senseid.cu_type,
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.cu_model = cdev->private->senseid.cu_model,
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.dev_type = cdev->private->senseid.dev_type,
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.dev_model = cdev->private->senseid.dev_model,
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};
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if (notify) {
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cdev->private->state = DEV_STATE_OFFLINE;
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if (same_dev) {
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/* Get device online again. */
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ccw_device_online(cdev);
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wake_up(&cdev->private->wait_q);
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}
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return;
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}
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/* Issue device info message. */
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CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: "
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"CU Type/Mod = %04X/%02X, Dev Type/Mod = "
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"%04X/%02X\n", cdev->private->devno,
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cdev->id.cu_type, cdev->id.cu_model,
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cdev->id.dev_type, cdev->id.dev_model);
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break;
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case DEV_STATE_BOXED:
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CIO_DEBUG(KERN_WARNING, 2,
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"SenseID : boxed device %04x on subchannel %04x\n",
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cdev->private->devno, sch->irq);
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break;
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}
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cdev->private->state = state;
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io_subchannel_recog_done(cdev);
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if (state != DEV_STATE_NOT_OPER)
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wake_up(&cdev->private->wait_q);
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}
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/*
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* Function called from device_id.c after sense id has completed.
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*/
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void
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ccw_device_sense_id_done(struct ccw_device *cdev, int err)
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{
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switch (err) {
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case 0:
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ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
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break;
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case -ETIME: /* Sense id stopped by timeout. */
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ccw_device_recog_done(cdev, DEV_STATE_BOXED);
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break;
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default:
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ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
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break;
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}
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}
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static void
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ccw_device_oper_notify(void *data)
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{
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struct ccw_device *cdev;
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struct subchannel *sch;
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int ret;
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cdev = (struct ccw_device *)data;
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sch = to_subchannel(cdev->dev.parent);
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ret = (sch->driver && sch->driver->notify) ?
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sch->driver->notify(&sch->dev, CIO_OPER) : 0;
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if (!ret)
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/* Driver doesn't want device back. */
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ccw_device_do_unreg_rereg((void *)cdev);
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else
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wake_up(&cdev->private->wait_q);
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}
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/*
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* Finished with online/offline processing.
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*/
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static void
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ccw_device_done(struct ccw_device *cdev, int state)
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{
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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if (state != DEV_STATE_ONLINE)
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cio_disable_subchannel(sch);
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/* Reset device status. */
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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cdev->private->state = state;
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if (state == DEV_STATE_BOXED)
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CIO_DEBUG(KERN_WARNING, 2,
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"Boxed device %04x on subchannel %04x\n",
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cdev->private->devno, sch->irq);
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if (cdev->private->flags.donotify) {
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cdev->private->flags.donotify = 0;
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PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
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(void *)cdev);
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queue_work(ccw_device_notify_work, &cdev->private->kick_work);
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}
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wake_up(&cdev->private->wait_q);
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if (css_init_done && state != DEV_STATE_ONLINE)
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put_device (&cdev->dev);
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}
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/*
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* Function called from device_pgid.c after sense path ground has completed.
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*/
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void
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ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
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{
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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switch (err) {
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case 0:
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/* Start Path Group verification. */
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sch->vpm = 0; /* Start with no path groups set. */
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cdev->private->state = DEV_STATE_VERIFY;
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ccw_device_verify_start(cdev);
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break;
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case -ETIME: /* Sense path group id stopped by timeout. */
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case -EUSERS: /* device is reserved for someone else. */
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ccw_device_done(cdev, DEV_STATE_BOXED);
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break;
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case -EOPNOTSUPP: /* path grouping not supported, just set online. */
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cdev->private->options.pgroup = 0;
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ccw_device_done(cdev, DEV_STATE_ONLINE);
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break;
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default:
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ccw_device_done(cdev, DEV_STATE_NOT_OPER);
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break;
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}
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}
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/*
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* Start device recognition.
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*/
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int
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ccw_device_recognition(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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int ret;
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if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
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(cdev->private->state != DEV_STATE_BOXED))
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return -EINVAL;
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sch = to_subchannel(cdev->dev.parent);
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ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
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if (ret != 0)
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/* Couldn't enable the subchannel for i/o. Sick device. */
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return ret;
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/* After 60s the device recognition is considered to have failed. */
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ccw_device_set_timeout(cdev, 60*HZ);
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|
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/*
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* We used to start here with a sense pgid to find out whether a device
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* is locked by someone else. Unfortunately, the sense pgid command
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* code has other meanings on devices predating the path grouping
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* algorithm, so we start with sense id and box the device after an
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* timeout (or if sense pgid during path verification detects the device
|
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* is locked, as may happen on newer devices).
|
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*/
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cdev->private->flags.recog_done = 0;
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cdev->private->state = DEV_STATE_SENSE_ID;
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ccw_device_sense_id_start(cdev);
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return 0;
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}
|
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|
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/*
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* Handle timeout in device recognition.
|
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*/
|
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static void
|
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ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
|
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{
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int ret;
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|
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ret = ccw_device_cancel_halt_clear(cdev);
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switch (ret) {
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case 0:
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ccw_device_recog_done(cdev, DEV_STATE_BOXED);
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break;
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case -ENODEV:
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ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
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break;
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default:
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ccw_device_set_timeout(cdev, 3*HZ);
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}
|
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}
|
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|
|
|
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static void
|
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ccw_device_nopath_notify(void *data)
|
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{
|
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struct ccw_device *cdev;
|
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struct subchannel *sch;
|
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int ret;
|
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|
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cdev = (struct ccw_device *)data;
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sch = to_subchannel(cdev->dev.parent);
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/* Extra sanity. */
|
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if (sch->lpm)
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return;
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ret = (sch->driver && sch->driver->notify) ?
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sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
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if (!ret) {
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if (get_device(&sch->dev)) {
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/* Driver doesn't want to keep device. */
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cio_disable_subchannel(sch);
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if (get_device(&cdev->dev)) {
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PREPARE_WORK(&cdev->private->kick_work,
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ccw_device_call_sch_unregister,
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(void *)cdev);
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queue_work(ccw_device_work,
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&cdev->private->kick_work);
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} else
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put_device(&sch->dev);
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}
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} else {
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cio_disable_subchannel(sch);
|
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ccw_device_set_timeout(cdev, 0);
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cdev->private->flags.fake_irb = 0;
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cdev->private->state = DEV_STATE_DISCONNECTED;
|
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wake_up(&cdev->private->wait_q);
|
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}
|
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}
|
|
|
|
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);
|