2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
5 * Copyright IBM Corp. 2002,2008
6 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/spinlock.h>
13 #include <linux/errno.h>
14 #include <linux/err.h>
15 #include <linux/slab.h>
16 #include <linux/list.h>
17 #include <linux/device.h>
18 #include <linux/workqueue.h>
19 #include <linux/timer.h>
21 #include <asm/ccwdev.h>
23 #include <asm/param.h> /* HZ */
29 #include "cio_debug.h"
35 static struct timer_list recovery_timer;
36 static DEFINE_SPINLOCK(recovery_lock);
37 static int recovery_phase;
38 static const unsigned long recovery_delay[] = { 3, 30, 300 };
40 /******************* bus type handling ***********************/
42 /* The Linux driver model distinguishes between a bus type and
43 * the bus itself. Of course we only have one channel
44 * subsystem driver and one channel system per machine, but
45 * we still use the abstraction. T.R. says it's a good idea. */
47 ccw_bus_match (struct device * dev, struct device_driver * drv)
49 struct ccw_device *cdev = to_ccwdev(dev);
50 struct ccw_driver *cdrv = to_ccwdrv(drv);
51 const struct ccw_device_id *ids = cdrv->ids, *found;
56 found = ccw_device_id_match(ids, &cdev->id);
60 cdev->id.driver_info = found->driver_info;
65 /* Store modalias string delimited by prefix/suffix string into buffer with
66 * specified size. Return length of resulting string (excluding trailing '\0')
67 * even if string doesn't fit buffer (snprintf semantics). */
68 static int snprint_alias(char *buf, size_t size,
69 struct ccw_device_id *id, const char *suffix)
73 len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
79 if (id->dev_type != 0)
80 len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
81 id->dev_model, suffix);
83 len += snprintf(buf, size, "dtdm%s", suffix);
88 /* Set up environment variables for ccw device uevent. Return 0 on success,
89 * non-zero otherwise. */
90 static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
92 struct ccw_device *cdev = to_ccwdev(dev);
93 struct ccw_device_id *id = &(cdev->id);
95 char modalias_buf[30];
98 ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
103 ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
107 /* The next two can be zero, that's ok for us */
109 ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
114 ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
119 snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
120 ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
124 struct bus_type ccw_bus_type;
126 static void io_subchannel_irq(struct subchannel *);
127 static int io_subchannel_probe(struct subchannel *);
128 static int io_subchannel_remove(struct subchannel *);
129 static void io_subchannel_shutdown(struct subchannel *);
130 static int io_subchannel_sch_event(struct subchannel *, int);
131 static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
134 static struct css_device_id io_subchannel_ids[] = {
135 { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
136 { /* end of list */ },
138 MODULE_DEVICE_TABLE(css, io_subchannel_ids);
140 static struct css_driver io_subchannel_driver = {
141 .owner = THIS_MODULE,
142 .subchannel_type = io_subchannel_ids,
143 .name = "io_subchannel",
144 .irq = io_subchannel_irq,
145 .sch_event = io_subchannel_sch_event,
146 .chp_event = io_subchannel_chp_event,
147 .probe = io_subchannel_probe,
148 .remove = io_subchannel_remove,
149 .shutdown = io_subchannel_shutdown,
152 struct workqueue_struct *ccw_device_work;
153 struct workqueue_struct *ccw_device_notify_work;
154 wait_queue_head_t ccw_device_init_wq;
155 atomic_t ccw_device_init_count;
157 static void recovery_func(unsigned long data);
160 init_ccw_bus_type (void)
164 init_waitqueue_head(&ccw_device_init_wq);
165 atomic_set(&ccw_device_init_count, 0);
166 setup_timer(&recovery_timer, recovery_func, 0);
168 ccw_device_work = create_singlethread_workqueue("cio");
169 if (!ccw_device_work)
170 return -ENOMEM; /* FIXME: better errno ? */
171 ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
172 if (!ccw_device_notify_work) {
173 ret = -ENOMEM; /* FIXME: better errno ? */
176 slow_path_wq = create_singlethread_workqueue("kslowcrw");
178 ret = -ENOMEM; /* FIXME: better errno ? */
181 if ((ret = bus_register (&ccw_bus_type)))
184 ret = css_driver_register(&io_subchannel_driver);
188 wait_event(ccw_device_init_wq,
189 atomic_read(&ccw_device_init_count) == 0);
190 flush_workqueue(ccw_device_work);
194 destroy_workqueue(ccw_device_work);
195 if (ccw_device_notify_work)
196 destroy_workqueue(ccw_device_notify_work);
198 destroy_workqueue(slow_path_wq);
203 cleanup_ccw_bus_type (void)
205 css_driver_unregister(&io_subchannel_driver);
206 bus_unregister(&ccw_bus_type);
207 destroy_workqueue(ccw_device_notify_work);
208 destroy_workqueue(ccw_device_work);
211 subsys_initcall(init_ccw_bus_type);
212 module_exit(cleanup_ccw_bus_type);
214 /************************ device handling **************************/
217 * A ccw_device has some interfaces in sysfs in addition to the
219 * The following entries are designed to export the information which
220 * resided in 2.4 in /proc/subchannels. Subchannel and device number
221 * are obvious, so they don't have an entry :)
222 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
225 chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
227 struct subchannel *sch = to_subchannel(dev);
228 struct chsc_ssd_info *ssd = &sch->ssd_info;
233 for (chp = 0; chp < 8; chp++) {
235 if (ssd->path_mask & mask)
236 ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
238 ret += sprintf(buf + ret, "00 ");
240 ret += sprintf (buf+ret, "\n");
241 return min((ssize_t)PAGE_SIZE, ret);
245 pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
247 struct subchannel *sch = to_subchannel(dev);
248 struct pmcw *pmcw = &sch->schib.pmcw;
250 return sprintf (buf, "%02x %02x %02x\n",
251 pmcw->pim, pmcw->pam, pmcw->pom);
255 devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
257 struct ccw_device *cdev = to_ccwdev(dev);
258 struct ccw_device_id *id = &(cdev->id);
260 if (id->dev_type != 0)
261 return sprintf(buf, "%04x/%02x\n",
262 id->dev_type, id->dev_model);
264 return sprintf(buf, "n/a\n");
268 cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
270 struct ccw_device *cdev = to_ccwdev(dev);
271 struct ccw_device_id *id = &(cdev->id);
273 return sprintf(buf, "%04x/%02x\n",
274 id->cu_type, id->cu_model);
278 modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
280 struct ccw_device *cdev = to_ccwdev(dev);
281 struct ccw_device_id *id = &(cdev->id);
284 len = snprint_alias(buf, PAGE_SIZE, id, "\n");
286 return len > PAGE_SIZE ? PAGE_SIZE : len;
290 online_show (struct device *dev, struct device_attribute *attr, char *buf)
292 struct ccw_device *cdev = to_ccwdev(dev);
294 return sprintf(buf, cdev->online ? "1\n" : "0\n");
297 int ccw_device_is_orphan(struct ccw_device *cdev)
299 return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
302 static void ccw_device_unregister(struct ccw_device *cdev)
304 if (test_and_clear_bit(1, &cdev->private->registered))
305 device_del(&cdev->dev);
308 static void ccw_device_remove_orphan_cb(struct device *dev)
310 struct ccw_device *cdev = to_ccwdev(dev);
312 ccw_device_unregister(cdev);
313 put_device(&cdev->dev);
316 static void ccw_device_remove_sch_cb(struct device *dev)
318 struct subchannel *sch;
320 sch = to_subchannel(dev);
321 css_sch_device_unregister(sch);
322 /* Reset intparm to zeroes. */
323 sch->schib.pmcw.intparm = 0;
325 put_device(&sch->dev);
329 ccw_device_remove_disconnected(struct ccw_device *cdev)
335 * Forced offline in disconnected state means
336 * 'throw away device'.
338 if (ccw_device_is_orphan(cdev)) {
340 * Deregister ccw device.
341 * Unfortunately, we cannot do this directly from the
344 spin_lock_irqsave(cdev->ccwlock, flags);
345 cdev->private->state = DEV_STATE_NOT_OPER;
346 spin_unlock_irqrestore(cdev->ccwlock, flags);
347 rc = device_schedule_callback(&cdev->dev,
348 ccw_device_remove_orphan_cb);
350 CIO_MSG_EVENT(0, "Couldn't unregister orphan "
352 cdev->private->dev_id.ssid,
353 cdev->private->dev_id.devno);
356 /* Deregister subchannel, which will kill the ccw device. */
357 rc = device_schedule_callback(cdev->dev.parent,
358 ccw_device_remove_sch_cb);
360 CIO_MSG_EVENT(0, "Couldn't unregister disconnected device "
362 cdev->private->dev_id.ssid,
363 cdev->private->dev_id.devno);
367 * ccw_device_set_offline() - disable a ccw device for I/O
368 * @cdev: target ccw device
370 * This function calls the driver's set_offline() function for @cdev, if
371 * given, and then disables @cdev.
373 * %0 on success and a negative error value on failure.
375 * enabled, ccw device lock not held
377 int ccw_device_set_offline(struct ccw_device *cdev)
383 if (!cdev->online || !cdev->drv)
386 if (cdev->drv->set_offline) {
387 ret = cdev->drv->set_offline(cdev);
392 spin_lock_irq(cdev->ccwlock);
393 ret = ccw_device_offline(cdev);
394 if (ret == -ENODEV) {
395 if (cdev->private->state != DEV_STATE_NOT_OPER) {
396 cdev->private->state = DEV_STATE_OFFLINE;
397 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
399 spin_unlock_irq(cdev->ccwlock);
402 spin_unlock_irq(cdev->ccwlock);
404 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
406 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
407 "device 0.%x.%04x\n",
408 ret, cdev->private->dev_id.ssid,
409 cdev->private->dev_id.devno);
416 * ccw_device_set_online() - enable a ccw device for I/O
417 * @cdev: target ccw device
419 * This function first enables @cdev and then calls the driver's set_online()
420 * function for @cdev, if given. If set_online() returns an error, @cdev is
423 * %0 on success and a negative error value on failure.
425 * enabled, ccw device lock not held
427 int ccw_device_set_online(struct ccw_device *cdev)
433 if (cdev->online || !cdev->drv)
436 spin_lock_irq(cdev->ccwlock);
437 ret = ccw_device_online(cdev);
438 spin_unlock_irq(cdev->ccwlock);
440 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
442 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
443 "device 0.%x.%04x\n",
444 ret, cdev->private->dev_id.ssid,
445 cdev->private->dev_id.devno);
448 if (cdev->private->state != DEV_STATE_ONLINE)
450 if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
454 spin_lock_irq(cdev->ccwlock);
455 ret = ccw_device_offline(cdev);
456 spin_unlock_irq(cdev->ccwlock);
458 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
460 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
461 "device 0.%x.%04x\n",
462 ret, cdev->private->dev_id.ssid,
463 cdev->private->dev_id.devno);
464 return (ret == 0) ? -ENODEV : ret;
467 static void online_store_handle_offline(struct ccw_device *cdev)
469 if (cdev->private->state == DEV_STATE_DISCONNECTED)
470 ccw_device_remove_disconnected(cdev);
471 else if (cdev->drv && cdev->drv->set_offline)
472 ccw_device_set_offline(cdev);
475 static int online_store_recog_and_online(struct ccw_device *cdev)
479 /* Do device recognition, if needed. */
480 if (cdev->id.cu_type == 0) {
481 ret = ccw_device_recognition(cdev);
483 CIO_MSG_EVENT(0, "Couldn't start recognition "
484 "for device 0.%x.%04x (ret=%d)\n",
485 cdev->private->dev_id.ssid,
486 cdev->private->dev_id.devno, ret);
489 wait_event(cdev->private->wait_q,
490 cdev->private->flags.recog_done);
492 if (cdev->drv && cdev->drv->set_online)
493 ccw_device_set_online(cdev);
496 static void online_store_handle_online(struct ccw_device *cdev, int force)
500 ret = online_store_recog_and_online(cdev);
503 if (force && cdev->private->state == DEV_STATE_BOXED) {
504 ret = ccw_device_stlck(cdev);
507 "ccw_device_stlck returned %d!\n", ret);
510 if (cdev->id.cu_type == 0)
511 cdev->private->state = DEV_STATE_NOT_OPER;
512 online_store_recog_and_online(cdev);
517 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
518 const char *buf, size_t count)
520 struct ccw_device *cdev = to_ccwdev(dev);
524 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
527 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
528 atomic_set(&cdev->private->onoff, 0);
531 if (!strncmp(buf, "force\n", count)) {
537 ret = strict_strtoul(buf, 16, &i);
543 online_store_handle_offline(cdev);
547 online_store_handle_online(cdev, force);
555 module_put(cdev->drv->owner);
556 atomic_set(&cdev->private->onoff, 0);
561 available_show (struct device *dev, struct device_attribute *attr, char *buf)
563 struct ccw_device *cdev = to_ccwdev(dev);
564 struct subchannel *sch;
566 if (ccw_device_is_orphan(cdev))
567 return sprintf(buf, "no device\n");
568 switch (cdev->private->state) {
569 case DEV_STATE_BOXED:
570 return sprintf(buf, "boxed\n");
571 case DEV_STATE_DISCONNECTED:
572 case DEV_STATE_DISCONNECTED_SENSE_ID:
573 case DEV_STATE_NOT_OPER:
574 sch = to_subchannel(dev->parent);
576 return sprintf(buf, "no path\n");
578 return sprintf(buf, "no device\n");
580 /* All other states considered fine. */
581 return sprintf(buf, "good\n");
585 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
586 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
587 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
588 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
589 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
590 static DEVICE_ATTR(online, 0644, online_show, online_store);
591 static DEVICE_ATTR(availability, 0444, available_show, NULL);
593 static struct attribute *io_subchannel_attrs[] = {
594 &dev_attr_chpids.attr,
595 &dev_attr_pimpampom.attr,
599 static struct attribute_group io_subchannel_attr_group = {
600 .attrs = io_subchannel_attrs,
603 static struct attribute * ccwdev_attrs[] = {
604 &dev_attr_devtype.attr,
605 &dev_attr_cutype.attr,
606 &dev_attr_modalias.attr,
607 &dev_attr_online.attr,
608 &dev_attr_cmb_enable.attr,
609 &dev_attr_availability.attr,
613 static struct attribute_group ccwdev_attr_group = {
614 .attrs = ccwdev_attrs,
617 static struct attribute_group *ccwdev_attr_groups[] = {
622 /* this is a simple abstraction for device_register that sets the
623 * correct bus type and adds the bus specific files */
624 static int ccw_device_register(struct ccw_device *cdev)
626 struct device *dev = &cdev->dev;
629 dev->bus = &ccw_bus_type;
631 if ((ret = device_add(dev)))
634 set_bit(1, &cdev->private->registered);
639 struct ccw_dev_id dev_id;
640 struct ccw_device * sibling;
644 match_devno(struct device * dev, void * data)
646 struct match_data * d = data;
647 struct ccw_device * cdev;
649 cdev = to_ccwdev(dev);
650 if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
651 !ccw_device_is_orphan(cdev) &&
652 ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
653 (cdev != d->sibling))
658 static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
659 struct ccw_device *sibling)
662 struct match_data data;
664 data.dev_id = *dev_id;
665 data.sibling = sibling;
666 dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
668 return dev ? to_ccwdev(dev) : NULL;
671 static int match_orphan(struct device *dev, void *data)
673 struct ccw_dev_id *dev_id;
674 struct ccw_device *cdev;
677 cdev = to_ccwdev(dev);
678 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
681 static struct ccw_device *
682 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
683 struct ccw_dev_id *dev_id)
687 dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
690 return dev ? to_ccwdev(dev) : NULL;
694 ccw_device_add_changed(struct work_struct *work)
696 struct ccw_device_private *priv;
697 struct ccw_device *cdev;
699 priv = container_of(work, struct ccw_device_private, kick_work);
701 if (device_add(&cdev->dev)) {
702 put_device(&cdev->dev);
705 set_bit(1, &cdev->private->registered);
708 void ccw_device_do_unreg_rereg(struct work_struct *work)
710 struct ccw_device_private *priv;
711 struct ccw_device *cdev;
712 struct subchannel *sch;
714 priv = container_of(work, struct ccw_device_private, kick_work);
716 sch = to_subchannel(cdev->dev.parent);
718 ccw_device_unregister(cdev);
719 PREPARE_WORK(&cdev->private->kick_work,
720 ccw_device_add_changed);
721 queue_work(ccw_device_work, &cdev->private->kick_work);
725 ccw_device_release(struct device *dev)
727 struct ccw_device *cdev;
729 cdev = to_ccwdev(dev);
730 kfree(cdev->private);
734 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
736 struct ccw_device *cdev;
738 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
740 cdev->private = kzalloc(sizeof(struct ccw_device_private),
741 GFP_KERNEL | GFP_DMA);
746 return ERR_PTR(-ENOMEM);
749 static int io_subchannel_initialize_dev(struct subchannel *sch,
750 struct ccw_device *cdev)
752 cdev->private->cdev = cdev;
753 atomic_set(&cdev->private->onoff, 0);
754 cdev->dev.parent = &sch->dev;
755 cdev->dev.release = ccw_device_release;
756 INIT_WORK(&cdev->private->kick_work, NULL);
757 cdev->dev.groups = ccwdev_attr_groups;
758 /* Do first half of device_register. */
759 device_initialize(&cdev->dev);
760 if (!get_device(&sch->dev)) {
761 if (cdev->dev.release)
762 cdev->dev.release(&cdev->dev);
768 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
770 struct ccw_device *cdev;
773 cdev = io_subchannel_allocate_dev(sch);
775 ret = io_subchannel_initialize_dev(sch, cdev);
784 static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
786 static void sch_attach_device(struct subchannel *sch,
787 struct ccw_device *cdev)
789 css_update_ssd_info(sch);
790 spin_lock_irq(sch->lock);
791 sch_set_cdev(sch, cdev);
792 cdev->private->schid = sch->schid;
793 cdev->ccwlock = sch->lock;
794 ccw_device_trigger_reprobe(cdev);
795 spin_unlock_irq(sch->lock);
798 static void sch_attach_disconnected_device(struct subchannel *sch,
799 struct ccw_device *cdev)
801 struct subchannel *other_sch;
804 other_sch = to_subchannel(get_device(cdev->dev.parent));
805 ret = device_move(&cdev->dev, &sch->dev);
807 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
808 "(ret=%d)!\n", cdev->private->dev_id.ssid,
809 cdev->private->dev_id.devno, ret);
810 put_device(&other_sch->dev);
813 sch_set_cdev(other_sch, NULL);
814 /* No need to keep a subchannel without ccw device around. */
815 css_sch_device_unregister(other_sch);
816 put_device(&other_sch->dev);
817 sch_attach_device(sch, cdev);
820 static void sch_attach_orphaned_device(struct subchannel *sch,
821 struct ccw_device *cdev)
825 /* Try to move the ccw device to its new subchannel. */
826 ret = device_move(&cdev->dev, &sch->dev);
828 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
829 "failed (ret=%d)!\n",
830 cdev->private->dev_id.ssid,
831 cdev->private->dev_id.devno, ret);
834 sch_attach_device(sch, cdev);
837 static void sch_create_and_recog_new_device(struct subchannel *sch)
839 struct ccw_device *cdev;
841 /* Need to allocate a new ccw device. */
842 cdev = io_subchannel_create_ccwdev(sch);
844 /* OK, we did everything we could... */
845 css_sch_device_unregister(sch);
848 spin_lock_irq(sch->lock);
849 sch_set_cdev(sch, cdev);
850 spin_unlock_irq(sch->lock);
851 /* Start recognition for the new ccw device. */
852 if (io_subchannel_recog(cdev, sch)) {
853 spin_lock_irq(sch->lock);
854 sch_set_cdev(sch, NULL);
855 spin_unlock_irq(sch->lock);
856 if (cdev->dev.release)
857 cdev->dev.release(&cdev->dev);
858 css_sch_device_unregister(sch);
863 void ccw_device_move_to_orphanage(struct work_struct *work)
865 struct ccw_device_private *priv;
866 struct ccw_device *cdev;
867 struct ccw_device *replacing_cdev;
868 struct subchannel *sch;
870 struct channel_subsystem *css;
871 struct ccw_dev_id dev_id;
873 priv = container_of(work, struct ccw_device_private, kick_work);
875 sch = to_subchannel(cdev->dev.parent);
876 css = to_css(sch->dev.parent);
877 dev_id.devno = sch->schib.pmcw.dev;
878 dev_id.ssid = sch->schid.ssid;
881 * Move the orphaned ccw device to the orphanage so the replacing
882 * ccw device can take its place on the subchannel.
884 ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev);
886 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
887 "(ret=%d)!\n", cdev->private->dev_id.ssid,
888 cdev->private->dev_id.devno, ret);
891 cdev->ccwlock = css->pseudo_subchannel->lock;
893 * Search for the replacing ccw device
894 * - among the disconnected devices
897 replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
898 if (replacing_cdev) {
899 sch_attach_disconnected_device(sch, replacing_cdev);
902 replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
903 if (replacing_cdev) {
904 sch_attach_orphaned_device(sch, replacing_cdev);
907 sch_create_and_recog_new_device(sch);
911 * Register recognized device.
914 io_subchannel_register(struct work_struct *work)
916 struct ccw_device_private *priv;
917 struct ccw_device *cdev;
918 struct subchannel *sch;
922 priv = container_of(work, struct ccw_device_private, kick_work);
924 sch = to_subchannel(cdev->dev.parent);
925 css_update_ssd_info(sch);
927 * io_subchannel_register() will also be called after device
928 * recognition has been done for a boxed device (which will already
929 * be registered). We need to reprobe since we may now have sense id
932 if (klist_node_attached(&cdev->dev.knode_parent)) {
934 ret = device_reprobe(&cdev->dev);
936 /* We can't do much here. */
937 CIO_MSG_EVENT(0, "device_reprobe() returned"
938 " %d for 0.%x.%04x\n", ret,
939 cdev->private->dev_id.ssid,
940 cdev->private->dev_id.devno);
945 * Now we know this subchannel will stay, we can throw
946 * our delayed uevent.
948 sch->dev.uevent_suppress = 0;
949 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
950 /* make it known to the system */
951 ret = ccw_device_register(cdev);
953 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
954 cdev->private->dev_id.ssid,
955 cdev->private->dev_id.devno, ret);
956 put_device(&cdev->dev);
957 spin_lock_irqsave(sch->lock, flags);
958 sch_set_cdev(sch, NULL);
959 spin_unlock_irqrestore(sch->lock, flags);
960 kfree (cdev->private);
962 put_device(&sch->dev);
963 if (atomic_dec_and_test(&ccw_device_init_count))
964 wake_up(&ccw_device_init_wq);
967 put_device(&cdev->dev);
969 cdev->private->flags.recog_done = 1;
970 put_device(&sch->dev);
971 wake_up(&cdev->private->wait_q);
972 if (atomic_dec_and_test(&ccw_device_init_count))
973 wake_up(&ccw_device_init_wq);
976 static void ccw_device_call_sch_unregister(struct work_struct *work)
978 struct ccw_device_private *priv;
979 struct ccw_device *cdev;
980 struct subchannel *sch;
982 priv = container_of(work, struct ccw_device_private, kick_work);
984 sch = to_subchannel(cdev->dev.parent);
985 css_sch_device_unregister(sch);
986 /* Reset intparm to zeroes. */
987 sch->schib.pmcw.intparm = 0;
989 put_device(&cdev->dev);
990 put_device(&sch->dev);
994 * subchannel recognition done. Called from the state machine.
997 io_subchannel_recog_done(struct ccw_device *cdev)
999 struct subchannel *sch;
1001 if (css_init_done == 0) {
1002 cdev->private->flags.recog_done = 1;
1005 switch (cdev->private->state) {
1006 case DEV_STATE_NOT_OPER:
1007 cdev->private->flags.recog_done = 1;
1008 /* Remove device found not operational. */
1009 if (!get_device(&cdev->dev))
1011 sch = to_subchannel(cdev->dev.parent);
1012 PREPARE_WORK(&cdev->private->kick_work,
1013 ccw_device_call_sch_unregister);
1014 queue_work(slow_path_wq, &cdev->private->kick_work);
1015 if (atomic_dec_and_test(&ccw_device_init_count))
1016 wake_up(&ccw_device_init_wq);
1018 case DEV_STATE_BOXED:
1019 /* Device did not respond in time. */
1020 case DEV_STATE_OFFLINE:
1022 * We can't register the device in interrupt context so
1023 * we schedule a work item.
1025 if (!get_device(&cdev->dev))
1027 PREPARE_WORK(&cdev->private->kick_work,
1028 io_subchannel_register);
1029 queue_work(slow_path_wq, &cdev->private->kick_work);
1035 io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
1038 struct ccw_device_private *priv;
1040 sch_set_cdev(sch, cdev);
1041 cdev->ccwlock = sch->lock;
1043 /* Init private data. */
1044 priv = cdev->private;
1045 priv->dev_id.devno = sch->schib.pmcw.dev;
1046 priv->dev_id.ssid = sch->schid.ssid;
1047 priv->schid = sch->schid;
1048 priv->state = DEV_STATE_NOT_OPER;
1049 INIT_LIST_HEAD(&priv->cmb_list);
1050 init_waitqueue_head(&priv->wait_q);
1051 init_timer(&priv->timer);
1053 /* Set an initial name for the device. */
1054 snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
1055 sch->schid.ssid, sch->schib.pmcw.dev);
1057 /* Increase counter of devices currently in recognition. */
1058 atomic_inc(&ccw_device_init_count);
1060 /* Start async. device sensing. */
1061 spin_lock_irq(sch->lock);
1062 rc = ccw_device_recognition(cdev);
1063 spin_unlock_irq(sch->lock);
1065 if (atomic_dec_and_test(&ccw_device_init_count))
1066 wake_up(&ccw_device_init_wq);
1071 static void ccw_device_move_to_sch(struct work_struct *work)
1073 struct ccw_device_private *priv;
1075 struct subchannel *sch;
1076 struct ccw_device *cdev;
1077 struct subchannel *former_parent;
1079 priv = container_of(work, struct ccw_device_private, kick_work);
1082 former_parent = ccw_device_is_orphan(cdev) ?
1083 NULL : to_subchannel(get_device(cdev->dev.parent));
1084 mutex_lock(&sch->reg_mutex);
1085 /* Try to move the ccw device to its new subchannel. */
1086 rc = device_move(&cdev->dev, &sch->dev);
1087 mutex_unlock(&sch->reg_mutex);
1089 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1090 "0.%x.%04x failed (ret=%d)!\n",
1091 cdev->private->dev_id.ssid,
1092 cdev->private->dev_id.devno, sch->schid.ssid,
1093 sch->schid.sch_no, rc);
1094 css_sch_device_unregister(sch);
1097 if (former_parent) {
1098 spin_lock_irq(former_parent->lock);
1099 sch_set_cdev(former_parent, NULL);
1100 spin_unlock_irq(former_parent->lock);
1101 css_sch_device_unregister(former_parent);
1102 /* Reset intparm to zeroes. */
1103 former_parent->schib.pmcw.intparm = 0;
1104 cio_modify(former_parent);
1106 sch_attach_device(sch, cdev);
1109 put_device(&former_parent->dev);
1110 put_device(&cdev->dev);
1113 static void io_subchannel_irq(struct subchannel *sch)
1115 struct ccw_device *cdev;
1117 cdev = sch_get_cdev(sch);
1119 CIO_TRACE_EVENT(3, "IRQ");
1120 CIO_TRACE_EVENT(3, sch->dev.bus_id);
1122 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1125 static void io_subchannel_init_fields(struct subchannel *sch)
1127 if (cio_is_console(sch->schid))
1130 sch->opm = chp_get_sch_opm(sch);
1131 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1132 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
1134 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1135 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1136 sch->schib.pmcw.dev, sch->schid.ssid,
1137 sch->schid.sch_no, sch->schib.pmcw.pim,
1138 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
1139 /* Initially set up some fields in the pmcw. */
1140 sch->schib.pmcw.ena = 0;
1141 sch->schib.pmcw.csense = 1; /* concurrent sense */
1142 if ((sch->lpm & (sch->lpm - 1)) != 0)
1143 sch->schib.pmcw.mp = 1; /* multipath mode */
1144 /* clean up possible residual cmf stuff */
1145 sch->schib.pmcw.mme = 0;
1146 sch->schib.pmcw.mbfc = 0;
1147 sch->schib.pmcw.mbi = 0;
1151 static int io_subchannel_probe(struct subchannel *sch)
1153 struct ccw_device *cdev;
1155 unsigned long flags;
1156 struct ccw_dev_id dev_id;
1158 cdev = sch_get_cdev(sch);
1160 rc = sysfs_create_group(&sch->dev.kobj,
1161 &io_subchannel_attr_group);
1163 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1164 "attributes for subchannel "
1165 "0.%x.%04x (rc=%d)\n",
1166 sch->schid.ssid, sch->schid.sch_no, rc);
1168 * This subchannel already has an associated ccw_device.
1169 * Throw the delayed uevent for the subchannel, register
1170 * the ccw_device and exit. This happens for all early
1171 * devices, e.g. the console.
1173 sch->dev.uevent_suppress = 0;
1174 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1175 cdev->dev.groups = ccwdev_attr_groups;
1176 device_initialize(&cdev->dev);
1177 ccw_device_register(cdev);
1179 * Check if the device is already online. If it is
1180 * the reference count needs to be corrected
1181 * (see ccw_device_online and css_init_done for the
1184 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1185 cdev->private->state != DEV_STATE_OFFLINE &&
1186 cdev->private->state != DEV_STATE_BOXED)
1187 get_device(&cdev->dev);
1190 io_subchannel_init_fields(sch);
1192 * First check if a fitting device may be found amongst the
1193 * disconnected devices or in the orphanage.
1195 dev_id.devno = sch->schib.pmcw.dev;
1196 dev_id.ssid = sch->schid.ssid;
1197 rc = sysfs_create_group(&sch->dev.kobj,
1198 &io_subchannel_attr_group);
1201 /* Allocate I/O subchannel private data. */
1202 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1203 GFP_KERNEL | GFP_DMA);
1204 if (!sch->private) {
1208 cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
1210 cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
1214 * Schedule moving the device until when we have a registered
1215 * subchannel to move to and succeed the probe. We can
1216 * unregister later again, when the probe is through.
1218 cdev->private->sch = sch;
1219 PREPARE_WORK(&cdev->private->kick_work,
1220 ccw_device_move_to_sch);
1221 queue_work(slow_path_wq, &cdev->private->kick_work);
1224 cdev = io_subchannel_create_ccwdev(sch);
1229 rc = io_subchannel_recog(cdev, sch);
1231 spin_lock_irqsave(sch->lock, flags);
1232 sch_set_cdev(sch, NULL);
1233 spin_unlock_irqrestore(sch->lock, flags);
1234 if (cdev->dev.release)
1235 cdev->dev.release(&cdev->dev);
1240 kfree(sch->private);
1241 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1246 io_subchannel_remove (struct subchannel *sch)
1248 struct ccw_device *cdev;
1249 unsigned long flags;
1251 cdev = sch_get_cdev(sch);
1254 /* Set ccw device to not operational and drop reference. */
1255 spin_lock_irqsave(cdev->ccwlock, flags);
1256 sch_set_cdev(sch, NULL);
1257 cdev->private->state = DEV_STATE_NOT_OPER;
1258 spin_unlock_irqrestore(cdev->ccwlock, flags);
1259 ccw_device_unregister(cdev);
1260 put_device(&cdev->dev);
1261 kfree(sch->private);
1262 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1266 static int io_subchannel_notify(struct subchannel *sch, int event)
1268 struct ccw_device *cdev;
1270 cdev = sch_get_cdev(sch);
1273 return ccw_device_notify(cdev, event);
1276 static void io_subchannel_verify(struct subchannel *sch)
1278 struct ccw_device *cdev;
1280 cdev = sch_get_cdev(sch);
1282 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1285 static int check_for_io_on_path(struct subchannel *sch, int mask)
1289 cc = stsch(sch->schid, &sch->schib);
1292 if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask)
1297 static void terminate_internal_io(struct subchannel *sch,
1298 struct ccw_device *cdev)
1300 if (cio_clear(sch)) {
1301 /* Recheck device in case clear failed. */
1304 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1306 css_schedule_eval(sch->schid);
1309 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
1310 /* Request retry of internal operation. */
1311 cdev->private->flags.intretry = 1;
1314 cdev->handler(cdev, cdev->private->intparm,
1318 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1320 struct ccw_device *cdev;
1322 cdev = sch_get_cdev(sch);
1325 if (check_for_io_on_path(sch, mask)) {
1326 if (cdev->private->state == DEV_STATE_ONLINE)
1327 ccw_device_kill_io(cdev);
1329 terminate_internal_io(sch, cdev);
1330 /* Re-start path verification. */
1331 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1334 /* trigger path verification. */
1335 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1339 static int io_subchannel_chp_event(struct subchannel *sch,
1340 struct chp_link *link, int event)
1344 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1351 io_subchannel_terminate_path(sch, mask);
1356 io_subchannel_verify(sch);
1359 if (stsch(sch->schid, &sch->schib))
1361 if (!css_sch_is_valid(&sch->schib))
1363 io_subchannel_terminate_path(sch, mask);
1366 if (stsch(sch->schid, &sch->schib))
1368 sch->lpm |= mask & sch->opm;
1369 io_subchannel_verify(sch);
1376 io_subchannel_shutdown(struct subchannel *sch)
1378 struct ccw_device *cdev;
1381 cdev = sch_get_cdev(sch);
1383 if (cio_is_console(sch->schid))
1385 if (!sch->schib.pmcw.ena)
1386 /* Nothing to do. */
1388 ret = cio_disable_subchannel(sch);
1390 /* Subchannel is disabled, we're done. */
1392 cdev->private->state = DEV_STATE_QUIESCE;
1394 cdev->handler(cdev, cdev->private->intparm,
1396 ret = ccw_device_cancel_halt_clear(cdev);
1397 if (ret == -EBUSY) {
1398 ccw_device_set_timeout(cdev, HZ/10);
1399 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1401 cio_disable_subchannel(sch);
1404 static int io_subchannel_get_status(struct subchannel *sch)
1408 if (stsch(sch->schid, &schib) || !schib.pmcw.dnv)
1410 if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev))
1411 return CIO_REVALIDATE;
1417 static int device_is_disconnected(struct ccw_device *cdev)
1421 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1422 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1425 static int recovery_check(struct device *dev, void *data)
1427 struct ccw_device *cdev = to_ccwdev(dev);
1430 spin_lock_irq(cdev->ccwlock);
1431 switch (cdev->private->state) {
1432 case DEV_STATE_DISCONNECTED:
1433 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1434 cdev->private->dev_id.ssid,
1435 cdev->private->dev_id.devno);
1436 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1439 case DEV_STATE_DISCONNECTED_SENSE_ID:
1443 spin_unlock_irq(cdev->ccwlock);
1448 static void recovery_work_func(struct work_struct *unused)
1452 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1454 spin_lock_irq(&recovery_lock);
1455 if (!timer_pending(&recovery_timer)) {
1456 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1458 mod_timer(&recovery_timer, jiffies +
1459 recovery_delay[recovery_phase] * HZ);
1461 spin_unlock_irq(&recovery_lock);
1463 CIO_MSG_EVENT(4, "recovery: end\n");
1466 static DECLARE_WORK(recovery_work, recovery_work_func);
1468 static void recovery_func(unsigned long data)
1471 * We can't do our recovery in softirq context and it's not
1472 * performance critical, so we schedule it.
1474 schedule_work(&recovery_work);
1477 static void ccw_device_schedule_recovery(void)
1479 unsigned long flags;
1481 CIO_MSG_EVENT(4, "recovery: schedule\n");
1482 spin_lock_irqsave(&recovery_lock, flags);
1483 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1485 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1487 spin_unlock_irqrestore(&recovery_lock, flags);
1490 static void device_set_disconnected(struct ccw_device *cdev)
1494 ccw_device_set_timeout(cdev, 0);
1495 cdev->private->flags.fake_irb = 0;
1496 cdev->private->state = DEV_STATE_DISCONNECTED;
1498 ccw_device_schedule_recovery();
1501 static int io_subchannel_sch_event(struct subchannel *sch, int slow)
1503 int event, ret, disc;
1504 unsigned long flags;
1505 enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action;
1506 struct ccw_device *cdev;
1508 spin_lock_irqsave(sch->lock, flags);
1509 cdev = sch_get_cdev(sch);
1510 disc = device_is_disconnected(cdev);
1512 /* Disconnected devices are evaluated directly only.*/
1513 spin_unlock_irqrestore(sch->lock, flags);
1516 /* No interrupt after machine check - kill pending timers. */
1518 ccw_device_set_timeout(cdev, 0);
1519 if (!disc && !slow) {
1520 /* Non-disconnected devices are evaluated on the slow path. */
1521 spin_unlock_irqrestore(sch->lock, flags);
1524 event = io_subchannel_get_status(sch);
1525 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1526 sch->schid.ssid, sch->schid.sch_no, event,
1527 disc ? "disconnected" : "normal",
1528 slow ? "slow" : "fast");
1529 /* Analyze subchannel status. */
1534 /* Check if paths have become available. */
1540 /* Prevent unwanted effects when opening lock. */
1541 cio_disable_subchannel(sch);
1542 device_set_disconnected(cdev);
1543 /* Ask driver what to do with device. */
1544 action = UNREGISTER;
1545 spin_unlock_irqrestore(sch->lock, flags);
1546 ret = io_subchannel_notify(sch, event);
1547 spin_lock_irqsave(sch->lock, flags);
1551 case CIO_REVALIDATE:
1552 /* Device will be removed, so no notify necessary. */
1554 /* Reprobe because immediate unregister might block. */
1557 action = UNREGISTER_PROBE;
1561 /* Get device operational again. */
1565 /* Perform action. */
1569 case UNREGISTER_PROBE:
1570 /* Unregister device (will use subchannel lock). */
1571 spin_unlock_irqrestore(sch->lock, flags);
1572 css_sch_device_unregister(sch);
1573 spin_lock_irqsave(sch->lock, flags);
1575 /* Reset intparm to zeroes. */
1576 sch->schib.pmcw.intparm = 0;
1580 ccw_device_trigger_reprobe(cdev);
1585 spin_unlock_irqrestore(sch->lock, flags);
1586 /* Probe if necessary. */
1587 if (action == UNREGISTER_PROBE)
1588 ret = css_probe_device(sch->schid);
1593 #ifdef CONFIG_CCW_CONSOLE
1594 static struct ccw_device console_cdev;
1595 static struct ccw_device_private console_private;
1596 static int console_cdev_in_use;
1598 static DEFINE_SPINLOCK(ccw_console_lock);
1600 spinlock_t * cio_get_console_lock(void)
1602 return &ccw_console_lock;
1605 static int ccw_device_console_enable(struct ccw_device *cdev,
1606 struct subchannel *sch)
1610 /* Attach subchannel private data. */
1611 sch->private = cio_get_console_priv();
1612 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1613 io_subchannel_init_fields(sch);
1614 sch->driver = &io_subchannel_driver;
1615 /* Initialize the ccw_device structure. */
1616 cdev->dev.parent= &sch->dev;
1617 rc = io_subchannel_recog(cdev, sch);
1621 /* Now wait for the async. recognition to come to an end. */
1622 spin_lock_irq(cdev->ccwlock);
1623 while (!dev_fsm_final_state(cdev))
1626 if (cdev->private->state != DEV_STATE_OFFLINE)
1628 ccw_device_online(cdev);
1629 while (!dev_fsm_final_state(cdev))
1631 if (cdev->private->state != DEV_STATE_ONLINE)
1635 spin_unlock_irq(cdev->ccwlock);
1640 ccw_device_probe_console(void)
1642 struct subchannel *sch;
1645 if (xchg(&console_cdev_in_use, 1) != 0)
1646 return ERR_PTR(-EBUSY);
1647 sch = cio_probe_console();
1649 console_cdev_in_use = 0;
1650 return (void *) sch;
1652 memset(&console_cdev, 0, sizeof(struct ccw_device));
1653 memset(&console_private, 0, sizeof(struct ccw_device_private));
1654 console_cdev.private = &console_private;
1655 console_private.cdev = &console_cdev;
1656 ret = ccw_device_console_enable(&console_cdev, sch);
1658 cio_release_console();
1659 console_cdev_in_use = 0;
1660 return ERR_PTR(ret);
1662 console_cdev.online = 1;
1663 return &console_cdev;
1668 * get ccw_device matching the busid, but only if owned by cdrv
1671 __ccwdev_check_busid(struct device *dev, void *id)
1677 return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0);
1682 * get_ccwdev_by_busid() - obtain device from a bus id
1683 * @cdrv: driver the device is owned by
1684 * @bus_id: bus id of the device to be searched
1686 * This function searches all devices owned by @cdrv for a device with a bus
1687 * id matching @bus_id.
1689 * If a match is found, its reference count of the found device is increased
1690 * and it is returned; else %NULL is returned.
1692 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1696 struct device_driver *drv;
1698 drv = get_driver(&cdrv->driver);
1702 dev = driver_find_device(drv, NULL, (void *)bus_id,
1703 __ccwdev_check_busid);
1706 return dev ? to_ccwdev(dev) : NULL;
1709 /************************** device driver handling ************************/
1711 /* This is the implementation of the ccw_driver class. The probe, remove
1712 * and release methods are initially very similar to the device_driver
1713 * implementations, with the difference that they have ccw_device
1716 * A ccw driver also contains the information that is needed for
1720 ccw_device_probe (struct device *dev)
1722 struct ccw_device *cdev = to_ccwdev(dev);
1723 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1726 cdev->drv = cdrv; /* to let the driver call _set_online */
1728 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1739 ccw_device_remove (struct device *dev)
1741 struct ccw_device *cdev = to_ccwdev(dev);
1742 struct ccw_driver *cdrv = cdev->drv;
1749 spin_lock_irq(cdev->ccwlock);
1750 ret = ccw_device_offline(cdev);
1751 spin_unlock_irq(cdev->ccwlock);
1753 wait_event(cdev->private->wait_q,
1754 dev_fsm_final_state(cdev));
1756 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1757 "device 0.%x.%04x\n",
1758 ret, cdev->private->dev_id.ssid,
1759 cdev->private->dev_id.devno);
1761 ccw_device_set_timeout(cdev, 0);
1766 static void ccw_device_shutdown(struct device *dev)
1768 struct ccw_device *cdev;
1770 cdev = to_ccwdev(dev);
1771 if (cdev->drv && cdev->drv->shutdown)
1772 cdev->drv->shutdown(cdev);
1776 struct bus_type ccw_bus_type = {
1778 .match = ccw_bus_match,
1779 .uevent = ccw_uevent,
1780 .probe = ccw_device_probe,
1781 .remove = ccw_device_remove,
1782 .shutdown = ccw_device_shutdown,
1786 * ccw_driver_register() - register a ccw driver
1787 * @cdriver: driver to be registered
1789 * This function is mainly a wrapper around driver_register().
1791 * %0 on success and a negative error value on failure.
1793 int ccw_driver_register(struct ccw_driver *cdriver)
1795 struct device_driver *drv = &cdriver->driver;
1797 drv->bus = &ccw_bus_type;
1798 drv->name = cdriver->name;
1799 drv->owner = cdriver->owner;
1801 return driver_register(drv);
1805 * ccw_driver_unregister() - deregister a ccw driver
1806 * @cdriver: driver to be deregistered
1808 * This function is mainly a wrapper around driver_unregister().
1810 void ccw_driver_unregister(struct ccw_driver *cdriver)
1812 driver_unregister(&cdriver->driver);
1815 /* Helper func for qdio. */
1816 struct subchannel_id
1817 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1819 struct subchannel *sch;
1821 sch = to_subchannel(cdev->dev.parent);
1825 MODULE_LICENSE("GPL");
1826 EXPORT_SYMBOL(ccw_device_set_online);
1827 EXPORT_SYMBOL(ccw_device_set_offline);
1828 EXPORT_SYMBOL(ccw_driver_register);
1829 EXPORT_SYMBOL(ccw_driver_unregister);
1830 EXPORT_SYMBOL(get_ccwdev_by_busid);
1831 EXPORT_SYMBOL(ccw_bus_type);
1832 EXPORT_SYMBOL(ccw_device_work);
1833 EXPORT_SYMBOL(ccw_device_notify_work);
1834 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);