diff options
Diffstat (limited to 'drivers/s390/cio/device_fsm.c')
| -rw-r--r-- | drivers/s390/cio/device_fsm.c | 1122 |
1 files changed, 1122 insertions, 0 deletions
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c new file mode 100644 index 000000000..6d63b9683 --- /dev/null +++ b/drivers/s390/cio/device_fsm.c @@ -0,0 +1,1122 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * finite state machine for device handling + * + * Copyright IBM Corp. 2002, 2008 + * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/string.h> + +#include <asm/ccwdev.h> +#include <asm/cio.h> +#include <asm/chpid.h> + +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "device.h" +#include "chsc.h" +#include "ioasm.h" +#include "chp.h" + +static int timeout_log_enabled; + +static int __init ccw_timeout_log_setup(char *unused) +{ + timeout_log_enabled = 1; + return 1; +} + +__setup("ccw_timeout_log", ccw_timeout_log_setup); + +static void ccw_timeout_log(struct ccw_device *cdev) +{ + struct schib schib; + struct subchannel *sch; + struct io_subchannel_private *private; + union orb *orb; + int cc; + + sch = to_subchannel(cdev->dev.parent); + private = to_io_private(sch); + orb = &private->orb; + cc = stsch(sch->schid, &schib); + + printk(KERN_WARNING "cio: ccw device timeout occurred at %lx, " + "device information:\n", get_tod_clock()); + printk(KERN_WARNING "cio: orb:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + orb, sizeof(*orb), 0); + printk(KERN_WARNING "cio: ccw device bus id: %s\n", + dev_name(&cdev->dev)); + printk(KERN_WARNING "cio: subchannel bus id: %s\n", + dev_name(&sch->dev)); + printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " + "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); + + if (orb->tm.b) { + printk(KERN_WARNING "cio: orb indicates transport mode\n"); + printk(KERN_WARNING "cio: last tcw:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + (void *)(addr_t)orb->tm.tcw, + sizeof(struct tcw), 0); + } else { + printk(KERN_WARNING "cio: orb indicates command mode\n"); + if ((void *)(addr_t)orb->cmd.cpa == + &private->dma_area->sense_ccw || + (void *)(addr_t)orb->cmd.cpa == + cdev->private->dma_area->iccws) + printk(KERN_WARNING "cio: last channel program " + "(intern):\n"); + else + printk(KERN_WARNING "cio: last channel program:\n"); + + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + (void *)(addr_t)orb->cmd.cpa, + sizeof(struct ccw1), 0); + } + printk(KERN_WARNING "cio: ccw device state: %d\n", + cdev->private->state); + printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); + printk(KERN_WARNING "cio: schib:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + &schib, sizeof(schib), 0); + printk(KERN_WARNING "cio: ccw device flags:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + &cdev->private->flags, sizeof(cdev->private->flags), 0); +} + +/* + * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. + */ +void +ccw_device_timeout(struct timer_list *t) +{ + struct ccw_device_private *priv = from_timer(priv, t, timer); + struct ccw_device *cdev = priv->cdev; + + spin_lock_irq(cdev->ccwlock); + if (timeout_log_enabled) + ccw_timeout_log(cdev); + 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); + else + mod_timer(&cdev->private->timer, jiffies + expires); +} + +int +ccw_device_cancel_halt_clear(struct ccw_device *cdev) +{ + struct subchannel *sch; + int ret; + + sch = to_subchannel(cdev->dev.parent); + ret = cio_cancel_halt_clear(sch, &cdev->private->iretry); + + if (ret == -EIO) + CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + + return ret; +} + +void ccw_device_update_sense_data(struct ccw_device *cdev) +{ + memset(&cdev->id, 0, sizeof(cdev->id)); + cdev->id.cu_type = cdev->private->dma_area->senseid.cu_type; + cdev->id.cu_model = cdev->private->dma_area->senseid.cu_model; + cdev->id.dev_type = cdev->private->dma_area->senseid.dev_type; + cdev->id.dev_model = cdev->private->dma_area->senseid.dev_model; +} + +int ccw_device_test_sense_data(struct ccw_device *cdev) +{ + return cdev->id.cu_type == + cdev->private->dma_area->senseid.cu_type && + cdev->id.cu_model == + cdev->private->dma_area->senseid.cu_model && + cdev->id.dev_type == + cdev->private->dma_area->senseid.dev_type && + cdev->id.dev_model == + cdev->private->dma_area->senseid.dev_model; +} + +/* + * 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 void +__recover_lost_chpids(struct subchannel *sch, int old_lpm) +{ + int mask, i; + struct chp_id chpid; + + chp_id_init(&chpid); + for (i = 0; i<8; i++) { + mask = 0x80 >> i; + if (!(sch->lpm & mask)) + continue; + if (old_lpm & mask) + continue; + chpid.id = sch->schib.pmcw.chpid[i]; + if (!chp_is_registered(chpid)) + css_schedule_eval_all(); + } +} + +/* + * Stop device recognition. + */ +static void +ccw_device_recog_done(struct ccw_device *cdev, int state) +{ + struct subchannel *sch; + int old_lpm; + + sch = to_subchannel(cdev->dev.parent); + + if (cio_disable_subchannel(sch)) + state = DEV_STATE_NOT_OPER; + /* + * Now that we tried recognition, we have performed device selection + * through ssch() and the path information is up to date. + */ + old_lpm = sch->lpm; + + /* Check since device may again have become not operational. */ + if (cio_update_schib(sch)) + state = DEV_STATE_NOT_OPER; + else + sch->lpm = sch->schib.pmcw.pam & 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 && + (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) { + cdev->private->flags.recog_done = 1; + cdev->private->state = DEV_STATE_DISCONNECTED; + wake_up(&cdev->private->wait_q); + return; + } + switch (state) { + case DEV_STATE_NOT_OPER: + break; + case DEV_STATE_OFFLINE: + if (!cdev->online) { + ccw_device_update_sense_data(cdev); + break; + } + cdev->private->state = DEV_STATE_OFFLINE; + cdev->private->flags.recog_done = 1; + if (ccw_device_test_sense_data(cdev)) { + cdev->private->flags.donotify = 1; + ccw_device_online(cdev); + wake_up(&cdev->private->wait_q); + } else { + ccw_device_update_sense_data(cdev); + ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); + } + return; + case DEV_STATE_BOXED: + if (cdev->id.cu_type != 0) { /* device was recognized before */ + cdev->private->flags.recog_done = 1; + cdev->private->state = DEV_STATE_BOXED; + wake_up(&cdev->private->wait_q); + return; + } + break; + } + cdev->private->state = state; + io_subchannel_recog_done(cdev); + 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; + } +} + +/** + * ccw_device_notify() - inform the device's driver about an event + * @cdev: device for which an event occurred + * @event: event that occurred + * + * Returns: + * -%EINVAL if the device is offline or has no driver. + * -%EOPNOTSUPP if the device's driver has no notifier registered. + * %NOTIFY_OK if the driver wants to keep the device. + * %NOTIFY_BAD if the driver doesn't want to keep the device. + */ +int ccw_device_notify(struct ccw_device *cdev, int event) +{ + int ret = -EINVAL; + + if (!cdev->drv) + goto out; + if (!cdev->online) + goto out; + CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", + cdev->private->dev_id.ssid, cdev->private->dev_id.devno, + event); + if (!cdev->drv->notify) { + ret = -EOPNOTSUPP; + goto out; + } + if (cdev->drv->notify(cdev, event)) + ret = NOTIFY_OK; + else + ret = NOTIFY_BAD; +out: + return ret; +} + +static void ccw_device_oper_notify(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) { + /* Reenable channel measurements, if needed. */ + ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); + /* Save indication for new paths. */ + cdev->private->path_new_mask = sch->vpm; + return; + } + /* Driver doesn't want device back. */ + ccw_device_set_notoper(cdev); + ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); +} + +/* + * 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); + + ccw_device_set_timeout(cdev, 0); + + if (state != DEV_STATE_ONLINE) + cio_disable_subchannel(sch); + + /* Reset device status. */ + memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb)); + + cdev->private->state = state; + + switch (state) { + case DEV_STATE_BOXED: + CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", + cdev->private->dev_id.devno, sch->schid.sch_no); + if (cdev->online && + ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK) + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + cdev->private->flags.donotify = 0; + break; + case DEV_STATE_NOT_OPER: + CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", + cdev->private->dev_id.devno, sch->schid.sch_no); + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + else + ccw_device_set_disconnected(cdev); + cdev->private->flags.donotify = 0; + break; + case DEV_STATE_DISCONNECTED: + CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " + "%04x\n", cdev->private->dev_id.devno, + sch->schid.sch_no); + if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) { + cdev->private->state = DEV_STATE_NOT_OPER; + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + } else + ccw_device_set_disconnected(cdev); + cdev->private->flags.donotify = 0; + break; + default: + break; + } + + if (cdev->private->flags.donotify) { + cdev->private->flags.donotify = 0; + ccw_device_oper_notify(cdev); + } + wake_up(&cdev->private->wait_q); +} + +/* + * Start device recognition. + */ +void ccw_device_recognition(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + /* + * 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; + if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { + ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); + return; + } + ccw_device_sense_id_start(cdev); +} + +/* + * Handle events for states that use the ccw request infrastructure. + */ +static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) +{ + switch (e) { + case DEV_EVENT_NOTOPER: + ccw_request_notoper(cdev); + break; + case DEV_EVENT_INTERRUPT: + ccw_request_handler(cdev); + break; + case DEV_EVENT_TIMEOUT: + ccw_request_timeout(cdev); + break; + default: + break; + } +} + +static void ccw_device_report_path_events(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + int path_event[8]; + int chp, mask; + + for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) { + path_event[chp] = PE_NONE; + if (mask & cdev->private->path_gone_mask & ~(sch->vpm)) + path_event[chp] |= PE_PATH_GONE; + if (mask & cdev->private->path_new_mask & sch->vpm) + path_event[chp] |= PE_PATH_AVAILABLE; + if (mask & cdev->private->pgid_reset_mask & sch->vpm) + path_event[chp] |= PE_PATHGROUP_ESTABLISHED; + } + if (cdev->online && cdev->drv->path_event) + cdev->drv->path_event(cdev, path_event); +} + +static void ccw_device_reset_path_events(struct ccw_device *cdev) +{ + cdev->private->path_gone_mask = 0; + cdev->private->path_new_mask = 0; + cdev->private->pgid_reset_mask = 0; +} + +static void create_fake_irb(struct irb *irb, int type) +{ + memset(irb, 0, sizeof(*irb)); + if (type == FAKE_CMD_IRB) { + struct cmd_scsw *scsw = &irb->scsw.cmd; + scsw->cc = 1; + scsw->fctl = SCSW_FCTL_START_FUNC; + scsw->actl = SCSW_ACTL_START_PEND; + scsw->stctl = SCSW_STCTL_STATUS_PEND; + } else if (type == FAKE_TM_IRB) { + struct tm_scsw *scsw = &irb->scsw.tm; + scsw->x = 1; + scsw->cc = 1; + scsw->fctl = SCSW_FCTL_START_FUNC; + scsw->actl = SCSW_ACTL_START_PEND; + scsw->stctl = SCSW_STCTL_STATUS_PEND; + } +} + +static void ccw_device_handle_broken_paths(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + u8 broken_paths = (sch->schib.pmcw.pam & sch->opm) ^ sch->vpm; + + if (broken_paths && (cdev->private->path_broken_mask != broken_paths)) + ccw_device_schedule_recovery(); + + cdev->private->path_broken_mask = broken_paths; +} + +void ccw_device_verify_done(struct ccw_device *cdev, int err) +{ + struct subchannel *sch; + + sch = to_subchannel(cdev->dev.parent); + /* Update schib - pom may have changed. */ + if (cio_update_schib(sch)) { + err = -ENODEV; + goto callback; + } + /* Update lpm with verified path mask. */ + sch->lpm = sch->vpm; + /* Repeat path verification? */ + if (cdev->private->flags.doverify) { + ccw_device_verify_start(cdev); + return; + } +callback: + switch (err) { + case 0: + ccw_device_done(cdev, DEV_STATE_ONLINE); + /* Deliver fake irb to device driver, if needed. */ + if (cdev->private->flags.fake_irb) { + create_fake_irb(&cdev->private->dma_area->irb, + cdev->private->flags.fake_irb); + cdev->private->flags.fake_irb = 0; + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + &cdev->private->dma_area->irb); + memset(&cdev->private->dma_area->irb, 0, + sizeof(struct irb)); + } + ccw_device_report_path_events(cdev); + ccw_device_handle_broken_paths(cdev); + break; + case -ETIME: + case -EUSERS: + /* Reset oper notify indication after verify error. */ + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_BOXED); + break; + case -EACCES: + /* Reset oper notify indication after verify error. */ + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_DISCONNECTED); + break; + default: + /* Reset oper notify indication after verify error. */ + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + break; + } + ccw_device_reset_path_events(cdev); +} + +/* + * 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); + ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); + 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; + } + /* Start initial path verification. */ + cdev->private->state = DEV_STATE_VERIFY; + ccw_device_verify_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: + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + break; + } +} + +/* + * Shutdown device. + */ +int +ccw_device_offline(struct ccw_device *cdev) +{ + struct subchannel *sch; + + /* Allow ccw_device_offline while disconnected. */ + if (cdev->private->state == DEV_STATE_DISCONNECTED || + cdev->private->state == DEV_STATE_NOT_OPER) { + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + return 0; + } + if (cdev->private->state == DEV_STATE_BOXED) { + ccw_device_done(cdev, DEV_STATE_BOXED); + return 0; + } + if (ccw_device_is_orphan(cdev)) { + ccw_device_done(cdev, DEV_STATE_OFFLINE); + return 0; + } + sch = to_subchannel(cdev->dev.parent); + if (cio_update_schib(sch)) + return -ENODEV; + if (scsw_actl(&sch->schib.scsw) != 0) + return -EBUSY; + if (cdev->private->state != DEV_STATE_ONLINE) + return -EINVAL; + /* Are we doing path grouping? */ + if (!cdev->private->flags.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 not operational event in non-special state. + */ +static void ccw_device_generic_notoper(struct ccw_device *cdev, + enum dev_event dev_event) +{ + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + else + ccw_device_set_disconnected(cdev); +} + +/* + * Handle path verification event in offline state. + */ +static void ccw_device_offline_verify(struct ccw_device *cdev, + enum dev_event dev_event) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + css_schedule_eval(sch->schid); +} + +/* + * 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->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. + */ + if (cio_update_schib(sch)) { + ccw_device_verify_done(cdev, -ENODEV); + return; + } + + if (scsw_actl(&sch->schib.scsw) != 0 || + (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || + (scsw_stctl(&cdev->private->dma_area->irb.scsw) & + SCSW_STCTL_STATUS_PEND)) { + /* + * No final status yet or final status not yet delivered + * to the device driver. Can't do path verification 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); +} + +/* + * Handle path verification event in boxed state. + */ +static void ccw_device_boxed_verify(struct ccw_device *cdev, + enum dev_event dev_event) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + if (cdev->online) { + if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + else + ccw_device_online_verify(cdev, dev_event); + } else + css_schedule_eval(sch->schid); +} + +/* + * Pass interrupt to device driver. + */ +static int ccw_device_call_handler(struct ccw_device *cdev) +{ + unsigned int stctl; + int ending_status; + + /* + * we allow for the device action handler if . + * - we received ending status + * - the action handler requested to see all interrupts + * - we received an intermediate status + * - fast notification was requested (primary status) + * - unsolicited interrupts + */ + stctl = scsw_stctl(&cdev->private->dma_area->irb.scsw); + ending_status = (stctl & SCSW_STCTL_SEC_STATUS) || + (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) || + (stctl == SCSW_STCTL_STATUS_PEND); + if (!ending_status && + !cdev->private->options.repall && + !(stctl & SCSW_STCTL_INTER_STATUS) && + !(cdev->private->options.fast && + (stctl & SCSW_STCTL_PRIM_STATUS))) + return 0; + + if (ending_status) + ccw_device_set_timeout(cdev, 0); + + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + &cdev->private->dma_area->irb); + + memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb)); + return 1; +} + +/* + * 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; + int is_cmd; + + irb = this_cpu_ptr(&cio_irb); + is_cmd = !scsw_is_tm(&irb->scsw); + /* Check for unsolicited interrupt. */ + if (!scsw_is_solicited(&irb->scsw)) { + if (is_cmd && (irb->scsw.cmd.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(&cdev->private->dma_area->irb, 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); + if (cdev->private->flags.doverify) + ccw_device_online_verify(cdev, 0); + return; + } + /* Accumulate status and find out if a basic sense is needed. */ + ccw_device_accumulate_irb(cdev, irb); + if (is_cmd && 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); + cdev->private->iretry = 255; + cdev->private->async_kill_io_rc = -ETIMEDOUT; + 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) + 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. + */ +static void +ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) +{ + struct irb *irb; + + irb = this_cpu_ptr(&cio_irb); + /* Check for unsolicited interrupt. */ + if (scsw_stctl(&irb->scsw) == + (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { + if (scsw_cc(&irb->scsw) == 1) + /* Basic sense hasn't started. Try again. */ + ccw_device_do_sense(cdev, irb); + else { + CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " + "interrupt during w4sense...\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + if (cdev->handler) + cdev->handler (cdev, 0, irb); + } + return; + } + /* + * Check if a halt or clear has been issued in the meanwhile. If yes, + * only deliver the halt/clear interrupt to the device driver as if it + * had killed the original request. + */ + if (scsw_fctl(&irb->scsw) & + (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { + cdev->private->flags.dosense = 0; + memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb)); + ccw_device_accumulate_irb(cdev, irb); + goto call_handler; + } + /* 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; + } +call_handler: + cdev->private->state = DEV_STATE_ONLINE; + /* In case sensing interfered with setting the device online */ + wake_up(&cdev->private->wait_q); + /* 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_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) +{ + ccw_device_set_timeout(cdev, 0); + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); + /* OK, i/o is dead now. Call interrupt handler. */ + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + ERR_PTR(cdev->private->async_kill_io_rc)); +} + +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; + } + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + ERR_PTR(cdev->private->async_kill_io_rc)); +} + +void ccw_device_kill_io(struct ccw_device *cdev) +{ + int ret; + + ccw_device_set_timeout(cdev, 0); + cdev->private->iretry = 255; + cdev->private->async_kill_io_rc = -EIO; + 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; + } + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + ERR_PTR(-EIO)); +} + +static void +ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) +{ + /* Start verification after current task finished. */ + cdev->private->flags.doverify = 1; +} + +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, (u32)(addr_t)sch) != 0) + /* Couldn't enable the subchannel for i/o. Sick device. */ + return; + cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; + ccw_device_sense_id_start(cdev); +} + +void ccw_device_trigger_reprobe(struct ccw_device *cdev) +{ + struct subchannel *sch; + + if (cdev->private->state != DEV_STATE_DISCONNECTED) + return; + + sch = to_subchannel(cdev->dev.parent); + /* Update some values. */ + if (cio_update_schib(sch)) + 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.pam & sch->opm; + /* + * Use the initial configuration since we can't be shure that the old + * paths are valid. + */ + io_subchannel_init_config(sch); + if (cio_commit_config(sch)) + return; + + /* We should also udate ssd info, but this has to wait. */ + /* Check if this is another device which appeared on the same sch. */ + if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) + css_schedule_eval(sch->schid); + else + ccw_device_start_id(cdev, 0); +} + +static void ccw_device_disabled_irq(struct ccw_device *cdev, + enum dev_event dev_event) +{ + struct subchannel *sch; + + sch = to_subchannel(cdev->dev.parent); + /* + * An interrupt in a disabled state means a previous disable was not + * successful - should not happen, but we try to disable 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_update_cmfblock(struct ccw_device *cdev, + enum dev_event dev_event) +{ + cmf_retry_copy_block(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); + cdev->private->state = DEV_STATE_NOT_OPER; + 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); + if (ret == -EBUSY) { + ccw_device_set_timeout(cdev, HZ/10); + } else { + cdev->private->state = DEV_STATE_NOT_OPER; + wake_up(&cdev->private->wait_q); + } +} + +/* + * 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) +{ +} + +/* + * 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_disabled_irq, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + [DEV_STATE_SENSE_ID] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + [DEV_STATE_OFFLINE] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_offline_verify, + }, + [DEV_STATE_VERIFY] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_delay_verify, + }, + [DEV_STATE_ONLINE] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_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_generic_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_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + [DEV_STATE_BOXED] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_nop, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, + }, + /* states to wait for i/o completion before doing something */ + [DEV_STATE_TIMEOUT_KILL] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, + [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, + [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME + }, + [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_nop, + [DEV_EVENT_VERIFY] = ccw_device_start_id, + }, + [DEV_STATE_DISCONNECTED_SENSE_ID] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [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, + }, + [DEV_STATE_CMFUPDATE] = { + [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, + [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, + [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, + [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, + }, + [DEV_STATE_STEAL_LOCK] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, +}; + +EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |