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"
34 #include "blacklist.h"
36 static struct timer_list recovery_timer;
37 static DEFINE_SPINLOCK(recovery_lock);
38 static int recovery_phase;
39 static const unsigned long recovery_delay[] = { 3, 30, 300 };
41 /******************* bus type handling ***********************/
43 /* The Linux driver model distinguishes between a bus type and
44 * the bus itself. Of course we only have one channel
45 * subsystem driver and one channel system per machine, but
46 * we still use the abstraction. T.R. says it's a good idea. */
48 ccw_bus_match (struct device * dev, struct device_driver * drv)
50 struct ccw_device *cdev = to_ccwdev(dev);
51 struct ccw_driver *cdrv = to_ccwdrv(drv);
52 const struct ccw_device_id *ids = cdrv->ids, *found;
57 found = ccw_device_id_match(ids, &cdev->id);
61 cdev->id.driver_info = found->driver_info;
66 /* Store modalias string delimited by prefix/suffix string into buffer with
67 * specified size. Return length of resulting string (excluding trailing '\0')
68 * even if string doesn't fit buffer (snprintf semantics). */
69 static int snprint_alias(char *buf, size_t size,
70 struct ccw_device_id *id, const char *suffix)
74 len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
80 if (id->dev_type != 0)
81 len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
82 id->dev_model, suffix);
84 len += snprintf(buf, size, "dtdm%s", suffix);
89 /* Set up environment variables for ccw device uevent. Return 0 on success,
90 * non-zero otherwise. */
91 static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
93 struct ccw_device *cdev = to_ccwdev(dev);
94 struct ccw_device_id *id = &(cdev->id);
96 char modalias_buf[30];
99 ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
104 ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
108 /* The next two can be zero, that's ok for us */
110 ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
115 ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
120 snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
121 ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
125 struct bus_type ccw_bus_type;
127 static void io_subchannel_irq(struct subchannel *);
128 static int io_subchannel_probe(struct subchannel *);
129 static int io_subchannel_remove(struct subchannel *);
130 static void io_subchannel_shutdown(struct subchannel *);
131 static int io_subchannel_sch_event(struct subchannel *, int);
132 static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
135 static struct css_device_id io_subchannel_ids[] = {
136 { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
137 { /* end of list */ },
139 MODULE_DEVICE_TABLE(css, io_subchannel_ids);
141 static struct css_driver io_subchannel_driver = {
142 .owner = THIS_MODULE,
143 .subchannel_type = io_subchannel_ids,
144 .name = "io_subchannel",
145 .irq = io_subchannel_irq,
146 .sch_event = io_subchannel_sch_event,
147 .chp_event = io_subchannel_chp_event,
148 .probe = io_subchannel_probe,
149 .remove = io_subchannel_remove,
150 .shutdown = io_subchannel_shutdown,
153 struct workqueue_struct *ccw_device_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 slow_path_wq = create_singlethread_workqueue("kslowcrw");
173 ret = -ENOMEM; /* FIXME: better errno ? */
176 if ((ret = bus_register (&ccw_bus_type)))
179 ret = css_driver_register(&io_subchannel_driver);
183 wait_event(ccw_device_init_wq,
184 atomic_read(&ccw_device_init_count) == 0);
185 flush_workqueue(ccw_device_work);
189 destroy_workqueue(ccw_device_work);
191 destroy_workqueue(slow_path_wq);
196 cleanup_ccw_bus_type (void)
198 css_driver_unregister(&io_subchannel_driver);
199 bus_unregister(&ccw_bus_type);
200 destroy_workqueue(ccw_device_work);
203 subsys_initcall(init_ccw_bus_type);
204 module_exit(cleanup_ccw_bus_type);
206 /************************ device handling **************************/
209 * A ccw_device has some interfaces in sysfs in addition to the
211 * The following entries are designed to export the information which
212 * resided in 2.4 in /proc/subchannels. Subchannel and device number
213 * are obvious, so they don't have an entry :)
214 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
217 chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
219 struct subchannel *sch = to_subchannel(dev);
220 struct chsc_ssd_info *ssd = &sch->ssd_info;
225 for (chp = 0; chp < 8; chp++) {
227 if (ssd->path_mask & mask)
228 ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
230 ret += sprintf(buf + ret, "00 ");
232 ret += sprintf (buf+ret, "\n");
233 return min((ssize_t)PAGE_SIZE, ret);
237 pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
239 struct subchannel *sch = to_subchannel(dev);
240 struct pmcw *pmcw = &sch->schib.pmcw;
242 return sprintf (buf, "%02x %02x %02x\n",
243 pmcw->pim, pmcw->pam, pmcw->pom);
247 devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
249 struct ccw_device *cdev = to_ccwdev(dev);
250 struct ccw_device_id *id = &(cdev->id);
252 if (id->dev_type != 0)
253 return sprintf(buf, "%04x/%02x\n",
254 id->dev_type, id->dev_model);
256 return sprintf(buf, "n/a\n");
260 cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
262 struct ccw_device *cdev = to_ccwdev(dev);
263 struct ccw_device_id *id = &(cdev->id);
265 return sprintf(buf, "%04x/%02x\n",
266 id->cu_type, id->cu_model);
270 modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
272 struct ccw_device *cdev = to_ccwdev(dev);
273 struct ccw_device_id *id = &(cdev->id);
276 len = snprint_alias(buf, PAGE_SIZE, id, "\n");
278 return len > PAGE_SIZE ? PAGE_SIZE : len;
282 online_show (struct device *dev, struct device_attribute *attr, char *buf)
284 struct ccw_device *cdev = to_ccwdev(dev);
286 return sprintf(buf, cdev->online ? "1\n" : "0\n");
289 int ccw_device_is_orphan(struct ccw_device *cdev)
291 return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
294 static void ccw_device_unregister(struct ccw_device *cdev)
296 if (test_and_clear_bit(1, &cdev->private->registered))
297 device_del(&cdev->dev);
300 static void ccw_device_remove_orphan_cb(struct work_struct *work)
302 struct ccw_device_private *priv;
303 struct ccw_device *cdev;
305 priv = container_of(work, struct ccw_device_private, kick_work);
307 ccw_device_unregister(cdev);
308 put_device(&cdev->dev);
309 /* Release cdev reference for workqueue processing. */
310 put_device(&cdev->dev);
313 static void ccw_device_call_sch_unregister(struct work_struct *work);
316 ccw_device_remove_disconnected(struct ccw_device *cdev)
321 * Forced offline in disconnected state means
322 * 'throw away device'.
324 /* Get cdev reference for workqueue processing. */
325 if (!get_device(&cdev->dev))
327 if (ccw_device_is_orphan(cdev)) {
329 * Deregister ccw device.
330 * Unfortunately, we cannot do this directly from the
333 spin_lock_irqsave(cdev->ccwlock, flags);
334 cdev->private->state = DEV_STATE_NOT_OPER;
335 spin_unlock_irqrestore(cdev->ccwlock, flags);
336 PREPARE_WORK(&cdev->private->kick_work,
337 ccw_device_remove_orphan_cb);
339 /* Deregister subchannel, which will kill the ccw device. */
340 PREPARE_WORK(&cdev->private->kick_work,
341 ccw_device_call_sch_unregister);
342 queue_work(slow_path_wq, &cdev->private->kick_work);
346 * ccw_device_set_offline() - disable a ccw device for I/O
347 * @cdev: target ccw device
349 * This function calls the driver's set_offline() function for @cdev, if
350 * given, and then disables @cdev.
352 * %0 on success and a negative error value on failure.
354 * enabled, ccw device lock not held
356 int ccw_device_set_offline(struct ccw_device *cdev)
362 if (!cdev->online || !cdev->drv)
365 if (cdev->drv->set_offline) {
366 ret = cdev->drv->set_offline(cdev);
371 spin_lock_irq(cdev->ccwlock);
372 ret = ccw_device_offline(cdev);
373 if (ret == -ENODEV) {
374 if (cdev->private->state != DEV_STATE_NOT_OPER) {
375 cdev->private->state = DEV_STATE_OFFLINE;
376 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
378 spin_unlock_irq(cdev->ccwlock);
379 /* Give up reference from ccw_device_set_online(). */
380 put_device(&cdev->dev);
383 spin_unlock_irq(cdev->ccwlock);
385 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
386 /* Give up reference from ccw_device_set_online(). */
387 put_device(&cdev->dev);
389 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
390 "device 0.%x.%04x\n",
391 ret, cdev->private->dev_id.ssid,
392 cdev->private->dev_id.devno);
399 * ccw_device_set_online() - enable a ccw device for I/O
400 * @cdev: target ccw device
402 * This function first enables @cdev and then calls the driver's set_online()
403 * function for @cdev, if given. If set_online() returns an error, @cdev is
406 * %0 on success and a negative error value on failure.
408 * enabled, ccw device lock not held
410 int ccw_device_set_online(struct ccw_device *cdev)
416 if (cdev->online || !cdev->drv)
418 /* Hold on to an extra reference while device is online. */
419 if (!get_device(&cdev->dev))
422 spin_lock_irq(cdev->ccwlock);
423 ret = ccw_device_online(cdev);
424 spin_unlock_irq(cdev->ccwlock);
426 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
428 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
429 "device 0.%x.%04x\n",
430 ret, cdev->private->dev_id.ssid,
431 cdev->private->dev_id.devno);
432 /* Give up online reference since onlining failed. */
433 put_device(&cdev->dev);
436 if (cdev->private->state != DEV_STATE_ONLINE) {
437 /* Give up online reference since onlining failed. */
438 put_device(&cdev->dev);
441 if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
445 spin_lock_irq(cdev->ccwlock);
446 ret = ccw_device_offline(cdev);
447 spin_unlock_irq(cdev->ccwlock);
449 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
451 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
452 "device 0.%x.%04x\n",
453 ret, cdev->private->dev_id.ssid,
454 cdev->private->dev_id.devno);
455 /* Give up online reference since onlining failed. */
456 put_device(&cdev->dev);
457 return (ret == 0) ? -ENODEV : ret;
460 static void online_store_handle_offline(struct ccw_device *cdev)
462 if (cdev->private->state == DEV_STATE_DISCONNECTED)
463 ccw_device_remove_disconnected(cdev);
464 else if (cdev->drv && cdev->drv->set_offline)
465 ccw_device_set_offline(cdev);
468 static int online_store_recog_and_online(struct ccw_device *cdev)
472 /* Do device recognition, if needed. */
473 if (cdev->id.cu_type == 0) {
474 ret = ccw_device_recognition(cdev);
476 CIO_MSG_EVENT(0, "Couldn't start recognition "
477 "for device 0.%x.%04x (ret=%d)\n",
478 cdev->private->dev_id.ssid,
479 cdev->private->dev_id.devno, ret);
482 wait_event(cdev->private->wait_q,
483 cdev->private->flags.recog_done);
485 if (cdev->drv && cdev->drv->set_online)
486 ccw_device_set_online(cdev);
489 static int online_store_handle_online(struct ccw_device *cdev, int force)
493 ret = online_store_recog_and_online(cdev);
496 if (force && cdev->private->state == DEV_STATE_BOXED) {
497 ret = ccw_device_stlck(cdev);
500 if (cdev->id.cu_type == 0)
501 cdev->private->state = DEV_STATE_NOT_OPER;
502 online_store_recog_and_online(cdev);
507 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
508 const char *buf, size_t count)
510 struct ccw_device *cdev = to_ccwdev(dev);
514 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
517 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
518 atomic_set(&cdev->private->onoff, 0);
521 if (!strncmp(buf, "force\n", count)) {
527 ret = strict_strtoul(buf, 16, &i);
533 online_store_handle_offline(cdev);
537 ret = online_store_handle_online(cdev, force);
546 module_put(cdev->drv->owner);
547 atomic_set(&cdev->private->onoff, 0);
552 available_show (struct device *dev, struct device_attribute *attr, char *buf)
554 struct ccw_device *cdev = to_ccwdev(dev);
555 struct subchannel *sch;
557 if (ccw_device_is_orphan(cdev))
558 return sprintf(buf, "no device\n");
559 switch (cdev->private->state) {
560 case DEV_STATE_BOXED:
561 return sprintf(buf, "boxed\n");
562 case DEV_STATE_DISCONNECTED:
563 case DEV_STATE_DISCONNECTED_SENSE_ID:
564 case DEV_STATE_NOT_OPER:
565 sch = to_subchannel(dev->parent);
567 return sprintf(buf, "no path\n");
569 return sprintf(buf, "no device\n");
571 /* All other states considered fine. */
572 return sprintf(buf, "good\n");
576 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
577 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
578 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
579 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
580 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
581 static DEVICE_ATTR(online, 0644, online_show, online_store);
582 static DEVICE_ATTR(availability, 0444, available_show, NULL);
584 static struct attribute *io_subchannel_attrs[] = {
585 &dev_attr_chpids.attr,
586 &dev_attr_pimpampom.attr,
590 static struct attribute_group io_subchannel_attr_group = {
591 .attrs = io_subchannel_attrs,
594 static struct attribute * ccwdev_attrs[] = {
595 &dev_attr_devtype.attr,
596 &dev_attr_cutype.attr,
597 &dev_attr_modalias.attr,
598 &dev_attr_online.attr,
599 &dev_attr_cmb_enable.attr,
600 &dev_attr_availability.attr,
604 static struct attribute_group ccwdev_attr_group = {
605 .attrs = ccwdev_attrs,
608 static struct attribute_group *ccwdev_attr_groups[] = {
613 /* this is a simple abstraction for device_register that sets the
614 * correct bus type and adds the bus specific files */
615 static int ccw_device_register(struct ccw_device *cdev)
617 struct device *dev = &cdev->dev;
620 dev->bus = &ccw_bus_type;
622 if ((ret = device_add(dev)))
625 set_bit(1, &cdev->private->registered);
630 struct ccw_dev_id dev_id;
631 struct ccw_device * sibling;
635 match_devno(struct device * dev, void * data)
637 struct match_data * d = data;
638 struct ccw_device * cdev;
640 cdev = to_ccwdev(dev);
641 if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
642 !ccw_device_is_orphan(cdev) &&
643 ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
644 (cdev != d->sibling))
649 static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
650 struct ccw_device *sibling)
653 struct match_data data;
655 data.dev_id = *dev_id;
656 data.sibling = sibling;
657 dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
659 return dev ? to_ccwdev(dev) : NULL;
662 static int match_orphan(struct device *dev, void *data)
664 struct ccw_dev_id *dev_id;
665 struct ccw_device *cdev;
668 cdev = to_ccwdev(dev);
669 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
672 static struct ccw_device *
673 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
674 struct ccw_dev_id *dev_id)
678 dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
681 return dev ? to_ccwdev(dev) : NULL;
685 ccw_device_add_changed(struct work_struct *work)
687 struct ccw_device_private *priv;
688 struct ccw_device *cdev;
690 priv = container_of(work, struct ccw_device_private, kick_work);
692 if (device_add(&cdev->dev)) {
693 put_device(&cdev->dev);
696 set_bit(1, &cdev->private->registered);
699 void ccw_device_do_unreg_rereg(struct work_struct *work)
701 struct ccw_device_private *priv;
702 struct ccw_device *cdev;
703 struct subchannel *sch;
705 priv = container_of(work, struct ccw_device_private, kick_work);
707 sch = to_subchannel(cdev->dev.parent);
709 ccw_device_unregister(cdev);
710 PREPARE_WORK(&cdev->private->kick_work,
711 ccw_device_add_changed);
712 queue_work(ccw_device_work, &cdev->private->kick_work);
716 ccw_device_release(struct device *dev)
718 struct ccw_device *cdev;
720 cdev = to_ccwdev(dev);
721 /* Release reference of parent subchannel. */
722 put_device(cdev->dev.parent);
723 kfree(cdev->private);
727 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
729 struct ccw_device *cdev;
731 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
733 cdev->private = kzalloc(sizeof(struct ccw_device_private),
734 GFP_KERNEL | GFP_DMA);
739 return ERR_PTR(-ENOMEM);
742 static int io_subchannel_initialize_dev(struct subchannel *sch,
743 struct ccw_device *cdev)
745 cdev->private->cdev = cdev;
746 atomic_set(&cdev->private->onoff, 0);
747 cdev->dev.parent = &sch->dev;
748 cdev->dev.release = ccw_device_release;
749 INIT_WORK(&cdev->private->kick_work, NULL);
750 cdev->dev.groups = ccwdev_attr_groups;
751 /* Do first half of device_register. */
752 device_initialize(&cdev->dev);
753 if (!get_device(&sch->dev)) {
754 if (cdev->dev.release)
755 cdev->dev.release(&cdev->dev);
761 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
763 struct ccw_device *cdev;
766 cdev = io_subchannel_allocate_dev(sch);
768 ret = io_subchannel_initialize_dev(sch, cdev);
777 static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
779 static void sch_attach_device(struct subchannel *sch,
780 struct ccw_device *cdev)
782 css_update_ssd_info(sch);
783 spin_lock_irq(sch->lock);
784 sch_set_cdev(sch, cdev);
785 cdev->private->schid = sch->schid;
786 cdev->ccwlock = sch->lock;
787 ccw_device_trigger_reprobe(cdev);
788 spin_unlock_irq(sch->lock);
791 static void sch_attach_disconnected_device(struct subchannel *sch,
792 struct ccw_device *cdev)
794 struct subchannel *other_sch;
797 /* Get reference for new parent. */
798 if (!get_device(&sch->dev))
800 other_sch = to_subchannel(cdev->dev.parent);
801 /* Note: device_move() changes cdev->dev.parent */
802 ret = device_move(&cdev->dev, &sch->dev);
804 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
805 "(ret=%d)!\n", cdev->private->dev_id.ssid,
806 cdev->private->dev_id.devno, ret);
807 /* Put reference for new parent. */
808 put_device(&sch->dev);
811 sch_set_cdev(other_sch, NULL);
812 /* No need to keep a subchannel without ccw device around. */
813 css_sch_device_unregister(other_sch);
814 sch_attach_device(sch, cdev);
815 /* Put reference for old parent. */
816 put_device(&other_sch->dev);
819 static void sch_attach_orphaned_device(struct subchannel *sch,
820 struct ccw_device *cdev)
823 struct subchannel *pseudo_sch;
825 /* Get reference for new parent. */
826 if (!get_device(&sch->dev))
828 pseudo_sch = to_subchannel(cdev->dev.parent);
830 * Try to move the ccw device to its new subchannel.
831 * Note: device_move() changes cdev->dev.parent
833 ret = device_move(&cdev->dev, &sch->dev);
835 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
836 "failed (ret=%d)!\n",
837 cdev->private->dev_id.ssid,
838 cdev->private->dev_id.devno, ret);
839 /* Put reference for new parent. */
840 put_device(&sch->dev);
843 sch_attach_device(sch, cdev);
844 /* Put reference on pseudo subchannel. */
845 put_device(&pseudo_sch->dev);
848 static void sch_create_and_recog_new_device(struct subchannel *sch)
850 struct ccw_device *cdev;
852 /* Need to allocate a new ccw device. */
853 cdev = io_subchannel_create_ccwdev(sch);
855 /* OK, we did everything we could... */
856 css_sch_device_unregister(sch);
859 spin_lock_irq(sch->lock);
860 sch_set_cdev(sch, cdev);
861 spin_unlock_irq(sch->lock);
862 /* Start recognition for the new ccw device. */
863 if (io_subchannel_recog(cdev, sch)) {
864 spin_lock_irq(sch->lock);
865 sch_set_cdev(sch, NULL);
866 spin_unlock_irq(sch->lock);
867 css_sch_device_unregister(sch);
868 /* Put reference from io_subchannel_create_ccwdev(). */
869 put_device(&sch->dev);
870 /* Give up initial reference. */
871 put_device(&cdev->dev);
876 void ccw_device_move_to_orphanage(struct work_struct *work)
878 struct ccw_device_private *priv;
879 struct ccw_device *cdev;
880 struct ccw_device *replacing_cdev;
881 struct subchannel *sch;
883 struct channel_subsystem *css;
884 struct ccw_dev_id dev_id;
886 priv = container_of(work, struct ccw_device_private, kick_work);
888 sch = to_subchannel(cdev->dev.parent);
889 css = to_css(sch->dev.parent);
890 dev_id.devno = sch->schib.pmcw.dev;
891 dev_id.ssid = sch->schid.ssid;
893 /* Increase refcount for pseudo subchannel. */
894 get_device(&css->pseudo_subchannel->dev);
896 * Move the orphaned ccw device to the orphanage so the replacing
897 * ccw device can take its place on the subchannel.
898 * Note: device_move() changes cdev->dev.parent
900 ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev);
902 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
903 "(ret=%d)!\n", cdev->private->dev_id.ssid,
904 cdev->private->dev_id.devno, ret);
905 /* Decrease refcount for pseudo subchannel again. */
906 put_device(&css->pseudo_subchannel->dev);
909 cdev->ccwlock = css->pseudo_subchannel->lock;
911 * Search for the replacing ccw device
912 * - among the disconnected devices
915 replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
916 if (replacing_cdev) {
917 sch_attach_disconnected_device(sch, replacing_cdev);
918 /* Release reference from get_disc_ccwdev_by_dev_id() */
919 put_device(&replacing_cdev->dev);
920 /* Release reference of subchannel from old cdev. */
921 put_device(&sch->dev);
924 replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
925 if (replacing_cdev) {
926 sch_attach_orphaned_device(sch, replacing_cdev);
927 /* Release reference from get_orphaned_ccwdev_by_dev_id() */
928 put_device(&replacing_cdev->dev);
929 /* Release reference of subchannel from old cdev. */
930 put_device(&sch->dev);
933 sch_create_and_recog_new_device(sch);
934 /* Release reference of subchannel from old cdev. */
935 put_device(&sch->dev);
939 * Register recognized device.
942 io_subchannel_register(struct work_struct *work)
944 struct ccw_device_private *priv;
945 struct ccw_device *cdev;
946 struct subchannel *sch;
950 priv = container_of(work, struct ccw_device_private, kick_work);
952 sch = to_subchannel(cdev->dev.parent);
953 css_update_ssd_info(sch);
955 * io_subchannel_register() will also be called after device
956 * recognition has been done for a boxed device (which will already
957 * be registered). We need to reprobe since we may now have sense id
960 if (klist_node_attached(&cdev->dev.knode_parent)) {
962 ret = device_reprobe(&cdev->dev);
964 /* We can't do much here. */
965 CIO_MSG_EVENT(0, "device_reprobe() returned"
966 " %d for 0.%x.%04x\n", ret,
967 cdev->private->dev_id.ssid,
968 cdev->private->dev_id.devno);
973 * Now we know this subchannel will stay, we can throw
974 * our delayed uevent.
976 sch->dev.uevent_suppress = 0;
977 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
978 /* make it known to the system */
979 ret = ccw_device_register(cdev);
981 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
982 cdev->private->dev_id.ssid,
983 cdev->private->dev_id.devno, ret);
984 spin_lock_irqsave(sch->lock, flags);
985 sch_set_cdev(sch, NULL);
986 spin_unlock_irqrestore(sch->lock, flags);
987 /* Release reference for workqueue processing. */
988 put_device(&cdev->dev);
989 /* Release initial device reference. */
990 put_device(&cdev->dev);
991 if (atomic_dec_and_test(&ccw_device_init_count))
992 wake_up(&ccw_device_init_wq);
995 put_device(&cdev->dev);
997 cdev->private->flags.recog_done = 1;
998 wake_up(&cdev->private->wait_q);
999 if (atomic_dec_and_test(&ccw_device_init_count))
1000 wake_up(&ccw_device_init_wq);
1003 static void ccw_device_call_sch_unregister(struct work_struct *work)
1005 struct ccw_device_private *priv;
1006 struct ccw_device *cdev;
1007 struct subchannel *sch;
1009 priv = container_of(work, struct ccw_device_private, kick_work);
1011 /* Get subchannel reference for local processing. */
1012 if (!get_device(cdev->dev.parent))
1014 sch = to_subchannel(cdev->dev.parent);
1015 css_sch_device_unregister(sch);
1016 /* Reset intparm to zeroes. */
1017 sch->schib.pmcw.intparm = 0;
1019 /* Release cdev reference for workqueue processing.*/
1020 put_device(&cdev->dev);
1021 /* Release subchannel reference for local processing. */
1022 put_device(&sch->dev);
1026 * subchannel recognition done. Called from the state machine.
1029 io_subchannel_recog_done(struct ccw_device *cdev)
1031 struct subchannel *sch;
1033 if (css_init_done == 0) {
1034 cdev->private->flags.recog_done = 1;
1037 switch (cdev->private->state) {
1038 case DEV_STATE_NOT_OPER:
1039 cdev->private->flags.recog_done = 1;
1040 /* Remove device found not operational. */
1041 if (!get_device(&cdev->dev))
1043 sch = to_subchannel(cdev->dev.parent);
1044 PREPARE_WORK(&cdev->private->kick_work,
1045 ccw_device_call_sch_unregister);
1046 queue_work(slow_path_wq, &cdev->private->kick_work);
1047 if (atomic_dec_and_test(&ccw_device_init_count))
1048 wake_up(&ccw_device_init_wq);
1050 case DEV_STATE_BOXED:
1051 /* Device did not respond in time. */
1052 case DEV_STATE_OFFLINE:
1054 * We can't register the device in interrupt context so
1055 * we schedule a work item.
1057 if (!get_device(&cdev->dev))
1059 PREPARE_WORK(&cdev->private->kick_work,
1060 io_subchannel_register);
1061 queue_work(slow_path_wq, &cdev->private->kick_work);
1067 io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
1070 struct ccw_device_private *priv;
1072 sch_set_cdev(sch, cdev);
1073 cdev->ccwlock = sch->lock;
1075 /* Init private data. */
1076 priv = cdev->private;
1077 priv->dev_id.devno = sch->schib.pmcw.dev;
1078 priv->dev_id.ssid = sch->schid.ssid;
1079 priv->schid = sch->schid;
1080 priv->state = DEV_STATE_NOT_OPER;
1081 INIT_LIST_HEAD(&priv->cmb_list);
1082 init_waitqueue_head(&priv->wait_q);
1083 init_timer(&priv->timer);
1085 /* Set an initial name for the device. */
1086 if (cio_is_console(sch->schid))
1087 cdev->dev.init_name = cio_get_console_cdev_name(sch);
1089 dev_set_name(&cdev->dev, "0.%x.%04x",
1090 sch->schid.ssid, sch->schib.pmcw.dev);
1092 /* Increase counter of devices currently in recognition. */
1093 atomic_inc(&ccw_device_init_count);
1095 /* Start async. device sensing. */
1096 spin_lock_irq(sch->lock);
1097 rc = ccw_device_recognition(cdev);
1098 spin_unlock_irq(sch->lock);
1100 if (atomic_dec_and_test(&ccw_device_init_count))
1101 wake_up(&ccw_device_init_wq);
1106 static void ccw_device_move_to_sch(struct work_struct *work)
1108 struct ccw_device_private *priv;
1110 struct subchannel *sch;
1111 struct ccw_device *cdev;
1112 struct subchannel *former_parent;
1114 priv = container_of(work, struct ccw_device_private, kick_work);
1117 former_parent = to_subchannel(cdev->dev.parent);
1118 /* Get reference for new parent. */
1119 if (!get_device(&sch->dev))
1121 mutex_lock(&sch->reg_mutex);
1123 * Try to move the ccw device to its new subchannel.
1124 * Note: device_move() changes cdev->dev.parent
1126 rc = device_move(&cdev->dev, &sch->dev);
1127 mutex_unlock(&sch->reg_mutex);
1129 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1130 "0.%x.%04x failed (ret=%d)!\n",
1131 cdev->private->dev_id.ssid,
1132 cdev->private->dev_id.devno, sch->schid.ssid,
1133 sch->schid.sch_no, rc);
1134 css_sch_device_unregister(sch);
1135 /* Put reference for new parent again. */
1136 put_device(&sch->dev);
1139 if (!sch_is_pseudo_sch(former_parent)) {
1140 spin_lock_irq(former_parent->lock);
1141 sch_set_cdev(former_parent, NULL);
1142 spin_unlock_irq(former_parent->lock);
1143 css_sch_device_unregister(former_parent);
1144 /* Reset intparm to zeroes. */
1145 former_parent->schib.pmcw.intparm = 0;
1146 cio_modify(former_parent);
1148 sch_attach_device(sch, cdev);
1150 /* Put reference for old parent. */
1151 put_device(&former_parent->dev);
1152 put_device(&cdev->dev);
1155 static void io_subchannel_irq(struct subchannel *sch)
1157 struct ccw_device *cdev;
1159 cdev = sch_get_cdev(sch);
1161 CIO_TRACE_EVENT(3, "IRQ");
1162 CIO_TRACE_EVENT(3, dev_name(&sch->dev));
1164 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1167 static void io_subchannel_init_fields(struct subchannel *sch)
1169 if (cio_is_console(sch->schid))
1172 sch->opm = chp_get_sch_opm(sch);
1173 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1174 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
1176 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1177 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1178 sch->schib.pmcw.dev, sch->schid.ssid,
1179 sch->schid.sch_no, sch->schib.pmcw.pim,
1180 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
1181 /* Initially set up some fields in the pmcw. */
1182 sch->schib.pmcw.ena = 0;
1183 sch->schib.pmcw.csense = 1; /* concurrent sense */
1184 if ((sch->lpm & (sch->lpm - 1)) != 0)
1185 sch->schib.pmcw.mp = 1; /* multipath mode */
1186 /* clean up possible residual cmf stuff */
1187 sch->schib.pmcw.mme = 0;
1188 sch->schib.pmcw.mbfc = 0;
1189 sch->schib.pmcw.mbi = 0;
1193 static int io_subchannel_probe(struct subchannel *sch)
1195 struct ccw_device *cdev;
1197 unsigned long flags;
1198 struct ccw_dev_id dev_id;
1200 cdev = sch_get_cdev(sch);
1202 rc = sysfs_create_group(&sch->dev.kobj,
1203 &io_subchannel_attr_group);
1205 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1206 "attributes for subchannel "
1207 "0.%x.%04x (rc=%d)\n",
1208 sch->schid.ssid, sch->schid.sch_no, rc);
1210 * This subchannel already has an associated ccw_device.
1211 * Throw the delayed uevent for the subchannel, register
1212 * the ccw_device and exit. This happens for all early
1213 * devices, e.g. the console.
1215 sch->dev.uevent_suppress = 0;
1216 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1217 cdev->dev.groups = ccwdev_attr_groups;
1218 device_initialize(&cdev->dev);
1219 ccw_device_register(cdev);
1221 * Check if the device is already online. If it is
1222 * the reference count needs to be corrected since we
1223 * didn't obtain a reference in ccw_device_set_online.
1225 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1226 cdev->private->state != DEV_STATE_OFFLINE &&
1227 cdev->private->state != DEV_STATE_BOXED)
1228 get_device(&cdev->dev);
1231 io_subchannel_init_fields(sch);
1232 rc = sysfs_create_group(&sch->dev.kobj,
1233 &io_subchannel_attr_group);
1236 /* Allocate I/O subchannel private data. */
1237 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1238 GFP_KERNEL | GFP_DMA);
1239 if (!sch->private) {
1244 * First check if a fitting device may be found amongst the
1245 * disconnected devices or in the orphanage.
1247 dev_id.devno = sch->schib.pmcw.dev;
1248 dev_id.ssid = sch->schid.ssid;
1249 cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
1251 cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
1255 * Schedule moving the device until when we have a registered
1256 * subchannel to move to and succeed the probe. We can
1257 * unregister later again, when the probe is through.
1259 cdev->private->sch = sch;
1260 PREPARE_WORK(&cdev->private->kick_work,
1261 ccw_device_move_to_sch);
1262 queue_work(slow_path_wq, &cdev->private->kick_work);
1265 cdev = io_subchannel_create_ccwdev(sch);
1270 rc = io_subchannel_recog(cdev, sch);
1272 spin_lock_irqsave(sch->lock, flags);
1273 sch_set_cdev(sch, NULL);
1274 spin_unlock_irqrestore(sch->lock, flags);
1275 if (cdev->dev.release)
1276 cdev->dev.release(&cdev->dev);
1281 kfree(sch->private);
1282 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1287 io_subchannel_remove (struct subchannel *sch)
1289 struct ccw_device *cdev;
1290 unsigned long flags;
1292 cdev = sch_get_cdev(sch);
1295 /* Set ccw device to not operational and drop reference. */
1296 spin_lock_irqsave(cdev->ccwlock, flags);
1297 sch_set_cdev(sch, NULL);
1298 cdev->private->state = DEV_STATE_NOT_OPER;
1299 spin_unlock_irqrestore(cdev->ccwlock, flags);
1300 ccw_device_unregister(cdev);
1301 put_device(&cdev->dev);
1302 kfree(sch->private);
1303 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1307 static int io_subchannel_notify(struct subchannel *sch, int event)
1309 struct ccw_device *cdev;
1311 cdev = sch_get_cdev(sch);
1314 return ccw_device_notify(cdev, event);
1317 static void io_subchannel_verify(struct subchannel *sch)
1319 struct ccw_device *cdev;
1321 cdev = sch_get_cdev(sch);
1323 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1326 static int check_for_io_on_path(struct subchannel *sch, int mask)
1330 cc = stsch(sch->schid, &sch->schib);
1333 if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask)
1338 static void terminate_internal_io(struct subchannel *sch,
1339 struct ccw_device *cdev)
1341 if (cio_clear(sch)) {
1342 /* Recheck device in case clear failed. */
1345 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1347 css_schedule_eval(sch->schid);
1350 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
1351 /* Request retry of internal operation. */
1352 cdev->private->flags.intretry = 1;
1355 cdev->handler(cdev, cdev->private->intparm,
1359 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1361 struct ccw_device *cdev;
1363 cdev = sch_get_cdev(sch);
1366 if (check_for_io_on_path(sch, mask)) {
1367 if (cdev->private->state == DEV_STATE_ONLINE)
1368 ccw_device_kill_io(cdev);
1370 terminate_internal_io(sch, cdev);
1371 /* Re-start path verification. */
1372 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1375 /* trigger path verification. */
1376 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1380 static int io_subchannel_chp_event(struct subchannel *sch,
1381 struct chp_link *link, int event)
1385 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1392 io_subchannel_terminate_path(sch, mask);
1397 io_subchannel_verify(sch);
1400 if (stsch(sch->schid, &sch->schib))
1402 if (!css_sch_is_valid(&sch->schib))
1404 io_subchannel_terminate_path(sch, mask);
1407 if (stsch(sch->schid, &sch->schib))
1409 sch->lpm |= mask & sch->opm;
1410 io_subchannel_verify(sch);
1417 io_subchannel_shutdown(struct subchannel *sch)
1419 struct ccw_device *cdev;
1422 cdev = sch_get_cdev(sch);
1424 if (cio_is_console(sch->schid))
1426 if (!sch->schib.pmcw.ena)
1427 /* Nothing to do. */
1429 ret = cio_disable_subchannel(sch);
1431 /* Subchannel is disabled, we're done. */
1433 cdev->private->state = DEV_STATE_QUIESCE;
1435 cdev->handler(cdev, cdev->private->intparm,
1437 ret = ccw_device_cancel_halt_clear(cdev);
1438 if (ret == -EBUSY) {
1439 ccw_device_set_timeout(cdev, HZ/10);
1440 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1442 cio_disable_subchannel(sch);
1445 static int io_subchannel_get_status(struct subchannel *sch)
1449 if (stsch(sch->schid, &schib) || !schib.pmcw.dnv)
1451 if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev))
1452 return CIO_REVALIDATE;
1458 static int device_is_disconnected(struct ccw_device *cdev)
1462 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1463 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1466 static int recovery_check(struct device *dev, void *data)
1468 struct ccw_device *cdev = to_ccwdev(dev);
1471 spin_lock_irq(cdev->ccwlock);
1472 switch (cdev->private->state) {
1473 case DEV_STATE_DISCONNECTED:
1474 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1475 cdev->private->dev_id.ssid,
1476 cdev->private->dev_id.devno);
1477 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1480 case DEV_STATE_DISCONNECTED_SENSE_ID:
1484 spin_unlock_irq(cdev->ccwlock);
1489 static void recovery_work_func(struct work_struct *unused)
1493 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1495 spin_lock_irq(&recovery_lock);
1496 if (!timer_pending(&recovery_timer)) {
1497 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1499 mod_timer(&recovery_timer, jiffies +
1500 recovery_delay[recovery_phase] * HZ);
1502 spin_unlock_irq(&recovery_lock);
1504 CIO_MSG_EVENT(4, "recovery: end\n");
1507 static DECLARE_WORK(recovery_work, recovery_work_func);
1509 static void recovery_func(unsigned long data)
1512 * We can't do our recovery in softirq context and it's not
1513 * performance critical, so we schedule it.
1515 schedule_work(&recovery_work);
1518 static void ccw_device_schedule_recovery(void)
1520 unsigned long flags;
1522 CIO_MSG_EVENT(4, "recovery: schedule\n");
1523 spin_lock_irqsave(&recovery_lock, flags);
1524 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1526 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1528 spin_unlock_irqrestore(&recovery_lock, flags);
1531 static int purge_fn(struct device *dev, void *data)
1533 struct ccw_device *cdev = to_ccwdev(dev);
1534 struct ccw_device_private *priv = cdev->private;
1537 spin_lock_irq(cdev->ccwlock);
1538 unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) &&
1539 (priv->state == DEV_STATE_OFFLINE);
1540 spin_unlock_irq(cdev->ccwlock);
1543 if (!get_device(&cdev->dev))
1545 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid,
1546 priv->dev_id.devno);
1547 PREPARE_WORK(&cdev->private->kick_work, ccw_device_call_sch_unregister);
1548 queue_work(slow_path_wq, &cdev->private->kick_work);
1551 /* Abort loop in case of pending signal. */
1552 if (signal_pending(current))
1559 * ccw_purge_blacklisted - purge unused, blacklisted devices
1561 * Unregister all ccw devices that are offline and on the blacklist.
1563 int ccw_purge_blacklisted(void)
1565 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1566 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1570 static void device_set_disconnected(struct ccw_device *cdev)
1574 ccw_device_set_timeout(cdev, 0);
1575 cdev->private->flags.fake_irb = 0;
1576 cdev->private->state = DEV_STATE_DISCONNECTED;
1578 ccw_device_schedule_recovery();
1581 void ccw_device_set_notoper(struct ccw_device *cdev)
1583 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1585 CIO_TRACE_EVENT(2, "notoper");
1586 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1587 ccw_device_set_timeout(cdev, 0);
1588 cio_disable_subchannel(sch);
1589 cdev->private->state = DEV_STATE_NOT_OPER;
1592 static int io_subchannel_sch_event(struct subchannel *sch, int slow)
1594 int event, ret, disc;
1595 unsigned long flags;
1596 enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action;
1597 struct ccw_device *cdev;
1599 spin_lock_irqsave(sch->lock, flags);
1600 cdev = sch_get_cdev(sch);
1601 disc = device_is_disconnected(cdev);
1603 /* Disconnected devices are evaluated directly only.*/
1604 spin_unlock_irqrestore(sch->lock, flags);
1607 /* No interrupt after machine check - kill pending timers. */
1609 ccw_device_set_timeout(cdev, 0);
1610 if (!disc && !slow) {
1611 /* Non-disconnected devices are evaluated on the slow path. */
1612 spin_unlock_irqrestore(sch->lock, flags);
1615 event = io_subchannel_get_status(sch);
1616 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1617 sch->schid.ssid, sch->schid.sch_no, event,
1618 disc ? "disconnected" : "normal",
1619 slow ? "slow" : "fast");
1620 /* Analyze subchannel status. */
1625 /* Check if paths have become available. */
1631 /* Ask driver what to do with device. */
1632 if (io_subchannel_notify(sch, event))
1635 action = UNREGISTER;
1637 case CIO_REVALIDATE:
1638 /* Device will be removed, so no notify necessary. */
1640 /* Reprobe because immediate unregister might block. */
1643 action = UNREGISTER_PROBE;
1647 /* Get device operational again. */
1651 /* Perform action. */
1655 case UNREGISTER_PROBE:
1656 ccw_device_set_notoper(cdev);
1657 /* Unregister device (will use subchannel lock). */
1658 spin_unlock_irqrestore(sch->lock, flags);
1659 css_sch_device_unregister(sch);
1660 spin_lock_irqsave(sch->lock, flags);
1662 /* Reset intparm to zeroes. */
1663 sch->schib.pmcw.intparm = 0;
1667 ccw_device_trigger_reprobe(cdev);
1670 device_set_disconnected(cdev);
1675 spin_unlock_irqrestore(sch->lock, flags);
1676 /* Probe if necessary. */
1677 if (action == UNREGISTER_PROBE)
1678 ret = css_probe_device(sch->schid);
1683 #ifdef CONFIG_CCW_CONSOLE
1684 static struct ccw_device console_cdev;
1685 static char console_cdev_name[10] = "0.x.xxxx";
1686 static struct ccw_device_private console_private;
1687 static int console_cdev_in_use;
1689 static DEFINE_SPINLOCK(ccw_console_lock);
1691 spinlock_t * cio_get_console_lock(void)
1693 return &ccw_console_lock;
1696 static int ccw_device_console_enable(struct ccw_device *cdev,
1697 struct subchannel *sch)
1701 /* Attach subchannel private data. */
1702 sch->private = cio_get_console_priv();
1703 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1704 io_subchannel_init_fields(sch);
1705 sch->driver = &io_subchannel_driver;
1706 /* Initialize the ccw_device structure. */
1707 cdev->dev.parent= &sch->dev;
1708 rc = io_subchannel_recog(cdev, sch);
1712 /* Now wait for the async. recognition to come to an end. */
1713 spin_lock_irq(cdev->ccwlock);
1714 while (!dev_fsm_final_state(cdev))
1717 if (cdev->private->state != DEV_STATE_OFFLINE)
1719 ccw_device_online(cdev);
1720 while (!dev_fsm_final_state(cdev))
1722 if (cdev->private->state != DEV_STATE_ONLINE)
1726 spin_unlock_irq(cdev->ccwlock);
1731 ccw_device_probe_console(void)
1733 struct subchannel *sch;
1736 if (xchg(&console_cdev_in_use, 1) != 0)
1737 return ERR_PTR(-EBUSY);
1738 sch = cio_probe_console();
1740 console_cdev_in_use = 0;
1741 return (void *) sch;
1743 memset(&console_cdev, 0, sizeof(struct ccw_device));
1744 memset(&console_private, 0, sizeof(struct ccw_device_private));
1745 console_cdev.private = &console_private;
1746 console_private.cdev = &console_cdev;
1747 ret = ccw_device_console_enable(&console_cdev, sch);
1749 cio_release_console();
1750 console_cdev_in_use = 0;
1751 return ERR_PTR(ret);
1753 console_cdev.online = 1;
1754 return &console_cdev;
1758 const char *cio_get_console_cdev_name(struct subchannel *sch)
1760 snprintf(console_cdev_name, 10, "0.%x.%04x",
1761 sch->schid.ssid, sch->schib.pmcw.dev);
1762 return (const char *)console_cdev_name;
1767 * get ccw_device matching the busid, but only if owned by cdrv
1770 __ccwdev_check_busid(struct device *dev, void *id)
1776 return (strcmp(bus_id, dev_name(dev)) == 0);
1781 * get_ccwdev_by_busid() - obtain device from a bus id
1782 * @cdrv: driver the device is owned by
1783 * @bus_id: bus id of the device to be searched
1785 * This function searches all devices owned by @cdrv for a device with a bus
1786 * id matching @bus_id.
1788 * If a match is found, its reference count of the found device is increased
1789 * and it is returned; else %NULL is returned.
1791 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1795 struct device_driver *drv;
1797 drv = get_driver(&cdrv->driver);
1801 dev = driver_find_device(drv, NULL, (void *)bus_id,
1802 __ccwdev_check_busid);
1805 return dev ? to_ccwdev(dev) : NULL;
1808 /************************** device driver handling ************************/
1810 /* This is the implementation of the ccw_driver class. The probe, remove
1811 * and release methods are initially very similar to the device_driver
1812 * implementations, with the difference that they have ccw_device
1815 * A ccw driver also contains the information that is needed for
1819 ccw_device_probe (struct device *dev)
1821 struct ccw_device *cdev = to_ccwdev(dev);
1822 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1825 cdev->drv = cdrv; /* to let the driver call _set_online */
1827 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1838 ccw_device_remove (struct device *dev)
1840 struct ccw_device *cdev = to_ccwdev(dev);
1841 struct ccw_driver *cdrv = cdev->drv;
1848 spin_lock_irq(cdev->ccwlock);
1849 ret = ccw_device_offline(cdev);
1850 spin_unlock_irq(cdev->ccwlock);
1852 wait_event(cdev->private->wait_q,
1853 dev_fsm_final_state(cdev));
1855 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1856 "device 0.%x.%04x\n",
1857 ret, cdev->private->dev_id.ssid,
1858 cdev->private->dev_id.devno);
1859 /* Give up reference obtained in ccw_device_set_online(). */
1860 put_device(&cdev->dev);
1862 ccw_device_set_timeout(cdev, 0);
1867 static void ccw_device_shutdown(struct device *dev)
1869 struct ccw_device *cdev;
1871 cdev = to_ccwdev(dev);
1872 if (cdev->drv && cdev->drv->shutdown)
1873 cdev->drv->shutdown(cdev);
1877 struct bus_type ccw_bus_type = {
1879 .match = ccw_bus_match,
1880 .uevent = ccw_uevent,
1881 .probe = ccw_device_probe,
1882 .remove = ccw_device_remove,
1883 .shutdown = ccw_device_shutdown,
1887 * ccw_driver_register() - register a ccw driver
1888 * @cdriver: driver to be registered
1890 * This function is mainly a wrapper around driver_register().
1892 * %0 on success and a negative error value on failure.
1894 int ccw_driver_register(struct ccw_driver *cdriver)
1896 struct device_driver *drv = &cdriver->driver;
1898 drv->bus = &ccw_bus_type;
1899 drv->name = cdriver->name;
1900 drv->owner = cdriver->owner;
1902 return driver_register(drv);
1906 * ccw_driver_unregister() - deregister a ccw driver
1907 * @cdriver: driver to be deregistered
1909 * This function is mainly a wrapper around driver_unregister().
1911 void ccw_driver_unregister(struct ccw_driver *cdriver)
1913 driver_unregister(&cdriver->driver);
1916 /* Helper func for qdio. */
1917 struct subchannel_id
1918 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1920 struct subchannel *sch;
1922 sch = to_subchannel(cdev->dev.parent);
1926 MODULE_LICENSE("GPL");
1927 EXPORT_SYMBOL(ccw_device_set_online);
1928 EXPORT_SYMBOL(ccw_device_set_offline);
1929 EXPORT_SYMBOL(ccw_driver_register);
1930 EXPORT_SYMBOL(ccw_driver_unregister);
1931 EXPORT_SYMBOL(get_ccwdev_by_busid);
1932 EXPORT_SYMBOL(ccw_bus_type);
1933 EXPORT_SYMBOL(ccw_device_work);
1934 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);