| // 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); |