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 int 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->online && cdev->drv && cdev->drv->set_offline)
465 return ccw_device_set_offline(cdev);
469 static int online_store_recog_and_online(struct ccw_device *cdev)
473 /* Do device recognition, if needed. */
474 if (cdev->id.cu_type == 0) {
475 ret = ccw_device_recognition(cdev);
477 CIO_MSG_EVENT(0, "Couldn't start recognition "
478 "for device 0.%x.%04x (ret=%d)\n",
479 cdev->private->dev_id.ssid,
480 cdev->private->dev_id.devno, ret);
483 wait_event(cdev->private->wait_q,
484 cdev->private->flags.recog_done);
485 if (cdev->private->state != DEV_STATE_OFFLINE)
486 /* recognition failed */
489 if (cdev->drv && cdev->drv->set_online)
490 ccw_device_set_online(cdev);
494 static int online_store_handle_online(struct ccw_device *cdev, int force)
498 ret = online_store_recog_and_online(cdev);
501 if (force && cdev->private->state == DEV_STATE_BOXED) {
502 ret = ccw_device_stlck(cdev);
505 if (cdev->id.cu_type == 0)
506 cdev->private->state = DEV_STATE_NOT_OPER;
507 ret = online_store_recog_and_online(cdev);
514 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
515 const char *buf, size_t count)
517 struct ccw_device *cdev = to_ccwdev(dev);
521 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
524 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
525 atomic_set(&cdev->private->onoff, 0);
528 if (!strncmp(buf, "force\n", count)) {
534 ret = strict_strtoul(buf, 16, &i);
540 ret = online_store_handle_offline(cdev);
543 ret = online_store_handle_online(cdev, force);
550 module_put(cdev->drv->owner);
551 atomic_set(&cdev->private->onoff, 0);
552 return (ret < 0) ? ret : count;
556 available_show (struct device *dev, struct device_attribute *attr, char *buf)
558 struct ccw_device *cdev = to_ccwdev(dev);
559 struct subchannel *sch;
561 if (ccw_device_is_orphan(cdev))
562 return sprintf(buf, "no device\n");
563 switch (cdev->private->state) {
564 case DEV_STATE_BOXED:
565 return sprintf(buf, "boxed\n");
566 case DEV_STATE_DISCONNECTED:
567 case DEV_STATE_DISCONNECTED_SENSE_ID:
568 case DEV_STATE_NOT_OPER:
569 sch = to_subchannel(dev->parent);
571 return sprintf(buf, "no path\n");
573 return sprintf(buf, "no device\n");
575 /* All other states considered fine. */
576 return sprintf(buf, "good\n");
580 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
581 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
582 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
583 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
584 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
585 static DEVICE_ATTR(online, 0644, online_show, online_store);
586 static DEVICE_ATTR(availability, 0444, available_show, NULL);
588 static struct attribute *io_subchannel_attrs[] = {
589 &dev_attr_chpids.attr,
590 &dev_attr_pimpampom.attr,
594 static struct attribute_group io_subchannel_attr_group = {
595 .attrs = io_subchannel_attrs,
598 static struct attribute * ccwdev_attrs[] = {
599 &dev_attr_devtype.attr,
600 &dev_attr_cutype.attr,
601 &dev_attr_modalias.attr,
602 &dev_attr_online.attr,
603 &dev_attr_cmb_enable.attr,
604 &dev_attr_availability.attr,
608 static struct attribute_group ccwdev_attr_group = {
609 .attrs = ccwdev_attrs,
612 static struct attribute_group *ccwdev_attr_groups[] = {
617 /* this is a simple abstraction for device_register that sets the
618 * correct bus type and adds the bus specific files */
619 static int ccw_device_register(struct ccw_device *cdev)
621 struct device *dev = &cdev->dev;
624 dev->bus = &ccw_bus_type;
626 if ((ret = device_add(dev)))
629 set_bit(1, &cdev->private->registered);
634 struct ccw_dev_id dev_id;
635 struct ccw_device * sibling;
639 match_devno(struct device * dev, void * data)
641 struct match_data * d = data;
642 struct ccw_device * cdev;
644 cdev = to_ccwdev(dev);
645 if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
646 !ccw_device_is_orphan(cdev) &&
647 ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
648 (cdev != d->sibling))
653 static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
654 struct ccw_device *sibling)
657 struct match_data data;
659 data.dev_id = *dev_id;
660 data.sibling = sibling;
661 dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
663 return dev ? to_ccwdev(dev) : NULL;
666 static int match_orphan(struct device *dev, void *data)
668 struct ccw_dev_id *dev_id;
669 struct ccw_device *cdev;
672 cdev = to_ccwdev(dev);
673 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
676 static struct ccw_device *
677 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
678 struct ccw_dev_id *dev_id)
682 dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
685 return dev ? to_ccwdev(dev) : NULL;
688 void ccw_device_do_unbind_bind(struct work_struct *work)
690 struct ccw_device_private *priv;
691 struct ccw_device *cdev;
692 struct subchannel *sch;
695 priv = container_of(work, struct ccw_device_private, kick_work);
697 sch = to_subchannel(cdev->dev.parent);
699 if (test_bit(1, &cdev->private->registered)) {
700 device_release_driver(&cdev->dev);
701 ret = device_attach(&cdev->dev);
702 WARN_ON(ret == -ENODEV);
707 ccw_device_release(struct device *dev)
709 struct ccw_device *cdev;
711 cdev = to_ccwdev(dev);
712 /* Release reference of parent subchannel. */
713 put_device(cdev->dev.parent);
714 kfree(cdev->private);
718 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
720 struct ccw_device *cdev;
722 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
724 cdev->private = kzalloc(sizeof(struct ccw_device_private),
725 GFP_KERNEL | GFP_DMA);
730 return ERR_PTR(-ENOMEM);
733 static int io_subchannel_initialize_dev(struct subchannel *sch,
734 struct ccw_device *cdev)
736 cdev->private->cdev = cdev;
737 atomic_set(&cdev->private->onoff, 0);
738 cdev->dev.parent = &sch->dev;
739 cdev->dev.release = ccw_device_release;
740 INIT_WORK(&cdev->private->kick_work, NULL);
741 cdev->dev.groups = ccwdev_attr_groups;
742 /* Do first half of device_register. */
743 device_initialize(&cdev->dev);
744 if (!get_device(&sch->dev)) {
745 /* Release reference from device_initialize(). */
746 put_device(&cdev->dev);
752 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
754 struct ccw_device *cdev;
757 cdev = io_subchannel_allocate_dev(sch);
759 ret = io_subchannel_initialize_dev(sch, cdev);
768 static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
770 static void sch_attach_device(struct subchannel *sch,
771 struct ccw_device *cdev)
773 css_update_ssd_info(sch);
774 spin_lock_irq(sch->lock);
775 sch_set_cdev(sch, cdev);
776 cdev->private->schid = sch->schid;
777 cdev->ccwlock = sch->lock;
778 ccw_device_trigger_reprobe(cdev);
779 spin_unlock_irq(sch->lock);
782 static void sch_attach_disconnected_device(struct subchannel *sch,
783 struct ccw_device *cdev)
785 struct subchannel *other_sch;
788 /* Get reference for new parent. */
789 if (!get_device(&sch->dev))
791 other_sch = to_subchannel(cdev->dev.parent);
792 /* Note: device_move() changes cdev->dev.parent */
793 ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
795 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
796 "(ret=%d)!\n", cdev->private->dev_id.ssid,
797 cdev->private->dev_id.devno, ret);
798 /* Put reference for new parent. */
799 put_device(&sch->dev);
802 sch_set_cdev(other_sch, NULL);
803 /* No need to keep a subchannel without ccw device around. */
804 css_sch_device_unregister(other_sch);
805 sch_attach_device(sch, cdev);
806 /* Put reference for old parent. */
807 put_device(&other_sch->dev);
810 static void sch_attach_orphaned_device(struct subchannel *sch,
811 struct ccw_device *cdev)
814 struct subchannel *pseudo_sch;
816 /* Get reference for new parent. */
817 if (!get_device(&sch->dev))
819 pseudo_sch = to_subchannel(cdev->dev.parent);
821 * Try to move the ccw device to its new subchannel.
822 * Note: device_move() changes cdev->dev.parent
824 ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
826 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
827 "failed (ret=%d)!\n",
828 cdev->private->dev_id.ssid,
829 cdev->private->dev_id.devno, ret);
830 /* Put reference for new parent. */
831 put_device(&sch->dev);
834 sch_attach_device(sch, cdev);
835 /* Put reference on pseudo subchannel. */
836 put_device(&pseudo_sch->dev);
839 static void sch_create_and_recog_new_device(struct subchannel *sch)
841 struct ccw_device *cdev;
843 /* Need to allocate a new ccw device. */
844 cdev = io_subchannel_create_ccwdev(sch);
846 /* OK, we did everything we could... */
847 css_sch_device_unregister(sch);
850 spin_lock_irq(sch->lock);
851 sch_set_cdev(sch, cdev);
852 spin_unlock_irq(sch->lock);
853 /* Start recognition for the new ccw device. */
854 if (io_subchannel_recog(cdev, sch)) {
855 spin_lock_irq(sch->lock);
856 sch_set_cdev(sch, NULL);
857 spin_unlock_irq(sch->lock);
858 css_sch_device_unregister(sch);
859 /* Put reference from io_subchannel_create_ccwdev(). */
860 put_device(&sch->dev);
861 /* Give up initial reference. */
862 put_device(&cdev->dev);
867 void ccw_device_move_to_orphanage(struct work_struct *work)
869 struct ccw_device_private *priv;
870 struct ccw_device *cdev;
871 struct ccw_device *replacing_cdev;
872 struct subchannel *sch;
874 struct channel_subsystem *css;
875 struct ccw_dev_id dev_id;
877 priv = container_of(work, struct ccw_device_private, kick_work);
879 sch = to_subchannel(cdev->dev.parent);
880 css = to_css(sch->dev.parent);
881 dev_id.devno = sch->schib.pmcw.dev;
882 dev_id.ssid = sch->schid.ssid;
884 /* Increase refcount for pseudo subchannel. */
885 get_device(&css->pseudo_subchannel->dev);
887 * Move the orphaned ccw device to the orphanage so the replacing
888 * ccw device can take its place on the subchannel.
889 * Note: device_move() changes cdev->dev.parent
891 ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev,
894 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
895 "(ret=%d)!\n", cdev->private->dev_id.ssid,
896 cdev->private->dev_id.devno, ret);
897 /* Decrease refcount for pseudo subchannel again. */
898 put_device(&css->pseudo_subchannel->dev);
901 cdev->ccwlock = css->pseudo_subchannel->lock;
903 * Search for the replacing ccw device
904 * - among the disconnected devices
907 replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
908 if (replacing_cdev) {
909 sch_attach_disconnected_device(sch, replacing_cdev);
910 /* Release reference from get_disc_ccwdev_by_dev_id() */
911 put_device(&replacing_cdev->dev);
912 /* Release reference of subchannel from old cdev. */
913 put_device(&sch->dev);
916 replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
917 if (replacing_cdev) {
918 sch_attach_orphaned_device(sch, replacing_cdev);
919 /* Release reference from get_orphaned_ccwdev_by_dev_id() */
920 put_device(&replacing_cdev->dev);
921 /* Release reference of subchannel from old cdev. */
922 put_device(&sch->dev);
925 sch_create_and_recog_new_device(sch);
926 /* Release reference of subchannel from old cdev. */
927 put_device(&sch->dev);
931 * Register recognized device.
934 io_subchannel_register(struct work_struct *work)
936 struct ccw_device_private *priv;
937 struct ccw_device *cdev;
938 struct subchannel *sch;
942 priv = container_of(work, struct ccw_device_private, kick_work);
944 sch = to_subchannel(cdev->dev.parent);
946 * Check if subchannel is still registered. It may have become
947 * unregistered if a machine check hit us after finishing
948 * device recognition but before the register work could be
951 if (!device_is_registered(&sch->dev))
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 (device_is_registered(&cdev->dev)) {
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 dev_set_uevent_suppress(&sch->dev, 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 initial device reference. */
988 put_device(&cdev->dev);
992 cdev->private->flags.recog_done = 1;
993 wake_up(&cdev->private->wait_q);
995 /* Release reference for workqueue processing. */
996 put_device(&cdev->dev);
997 if (atomic_dec_and_test(&ccw_device_init_count))
998 wake_up(&ccw_device_init_wq);
1001 static void ccw_device_call_sch_unregister(struct work_struct *work)
1003 struct ccw_device_private *priv;
1004 struct ccw_device *cdev;
1005 struct subchannel *sch;
1007 priv = container_of(work, struct ccw_device_private, kick_work);
1009 /* Get subchannel reference for local processing. */
1010 if (!get_device(cdev->dev.parent))
1012 sch = to_subchannel(cdev->dev.parent);
1013 css_sch_device_unregister(sch);
1014 /* Reset intparm to zeroes. */
1015 sch->config.intparm = 0;
1016 cio_commit_config(sch);
1017 /* Release cdev reference for workqueue processing.*/
1018 put_device(&cdev->dev);
1019 /* Release subchannel reference for local processing. */
1020 put_device(&sch->dev);
1024 * subchannel recognition done. Called from the state machine.
1027 io_subchannel_recog_done(struct ccw_device *cdev)
1029 if (css_init_done == 0) {
1030 cdev->private->flags.recog_done = 1;
1033 switch (cdev->private->state) {
1034 case DEV_STATE_NOT_OPER:
1035 cdev->private->flags.recog_done = 1;
1036 /* Remove device found not operational. */
1037 if (!get_device(&cdev->dev))
1039 PREPARE_WORK(&cdev->private->kick_work,
1040 ccw_device_call_sch_unregister);
1041 queue_work(slow_path_wq, &cdev->private->kick_work);
1042 if (atomic_dec_and_test(&ccw_device_init_count))
1043 wake_up(&ccw_device_init_wq);
1045 case DEV_STATE_BOXED:
1046 /* Device did not respond in time. */
1047 case DEV_STATE_OFFLINE:
1049 * We can't register the device in interrupt context so
1050 * we schedule a work item.
1052 if (!get_device(&cdev->dev))
1054 PREPARE_WORK(&cdev->private->kick_work,
1055 io_subchannel_register);
1056 queue_work(slow_path_wq, &cdev->private->kick_work);
1062 io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
1065 struct ccw_device_private *priv;
1067 sch_set_cdev(sch, cdev);
1068 cdev->ccwlock = sch->lock;
1070 /* Init private data. */
1071 priv = cdev->private;
1072 priv->dev_id.devno = sch->schib.pmcw.dev;
1073 priv->dev_id.ssid = sch->schid.ssid;
1074 priv->schid = sch->schid;
1075 priv->state = DEV_STATE_NOT_OPER;
1076 INIT_LIST_HEAD(&priv->cmb_list);
1077 init_waitqueue_head(&priv->wait_q);
1078 init_timer(&priv->timer);
1080 /* Set an initial name for the device. */
1081 if (cio_is_console(sch->schid))
1082 cdev->dev.init_name = cio_get_console_cdev_name(sch);
1084 dev_set_name(&cdev->dev, "0.%x.%04x",
1085 sch->schid.ssid, sch->schib.pmcw.dev);
1087 /* Increase counter of devices currently in recognition. */
1088 atomic_inc(&ccw_device_init_count);
1090 /* Start async. device sensing. */
1091 spin_lock_irq(sch->lock);
1092 rc = ccw_device_recognition(cdev);
1093 spin_unlock_irq(sch->lock);
1095 if (atomic_dec_and_test(&ccw_device_init_count))
1096 wake_up(&ccw_device_init_wq);
1101 static void ccw_device_move_to_sch(struct work_struct *work)
1103 struct ccw_device_private *priv;
1105 struct subchannel *sch;
1106 struct ccw_device *cdev;
1107 struct subchannel *former_parent;
1109 priv = container_of(work, struct ccw_device_private, kick_work);
1112 former_parent = to_subchannel(cdev->dev.parent);
1113 /* Get reference for new parent. */
1114 if (!get_device(&sch->dev))
1116 mutex_lock(&sch->reg_mutex);
1118 * Try to move the ccw device to its new subchannel.
1119 * Note: device_move() changes cdev->dev.parent
1121 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
1122 mutex_unlock(&sch->reg_mutex);
1124 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1125 "0.%x.%04x failed (ret=%d)!\n",
1126 cdev->private->dev_id.ssid,
1127 cdev->private->dev_id.devno, sch->schid.ssid,
1128 sch->schid.sch_no, rc);
1129 css_sch_device_unregister(sch);
1130 /* Put reference for new parent again. */
1131 put_device(&sch->dev);
1134 if (!sch_is_pseudo_sch(former_parent)) {
1135 spin_lock_irq(former_parent->lock);
1136 sch_set_cdev(former_parent, NULL);
1137 spin_unlock_irq(former_parent->lock);
1138 css_sch_device_unregister(former_parent);
1139 /* Reset intparm to zeroes. */
1140 former_parent->config.intparm = 0;
1141 cio_commit_config(former_parent);
1143 sch_attach_device(sch, cdev);
1145 /* Put reference for old parent. */
1146 put_device(&former_parent->dev);
1147 put_device(&cdev->dev);
1150 static void io_subchannel_irq(struct subchannel *sch)
1152 struct ccw_device *cdev;
1154 cdev = sch_get_cdev(sch);
1156 CIO_TRACE_EVENT(3, "IRQ");
1157 CIO_TRACE_EVENT(3, dev_name(&sch->dev));
1159 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1162 void io_subchannel_init_config(struct subchannel *sch)
1164 memset(&sch->config, 0, sizeof(sch->config));
1165 sch->config.csense = 1;
1166 /* Use subchannel mp mode when there is more than 1 installed CHPID. */
1167 if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0)
1171 static void io_subchannel_init_fields(struct subchannel *sch)
1173 if (cio_is_console(sch->schid))
1176 sch->opm = chp_get_sch_opm(sch);
1177 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1178 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
1180 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1181 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1182 sch->schib.pmcw.dev, sch->schid.ssid,
1183 sch->schid.sch_no, sch->schib.pmcw.pim,
1184 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
1186 io_subchannel_init_config(sch);
1189 static void io_subchannel_do_unreg(struct work_struct *work)
1191 struct subchannel *sch;
1193 sch = container_of(work, struct subchannel, work);
1194 css_sch_device_unregister(sch);
1195 /* Reset intparm to zeroes. */
1196 sch->config.intparm = 0;
1197 cio_commit_config(sch);
1198 put_device(&sch->dev);
1201 /* Schedule unregister if we have no cdev. */
1202 static void io_subchannel_schedule_removal(struct subchannel *sch)
1204 get_device(&sch->dev);
1205 INIT_WORK(&sch->work, io_subchannel_do_unreg);
1206 queue_work(slow_path_wq, &sch->work);
1210 * Note: We always return 0 so that we bind to the device even on error.
1211 * This is needed so that our remove function is called on unregister.
1213 static int io_subchannel_probe(struct subchannel *sch)
1215 struct ccw_device *cdev;
1217 unsigned long flags;
1218 struct ccw_dev_id dev_id;
1220 cdev = sch_get_cdev(sch);
1222 rc = sysfs_create_group(&sch->dev.kobj,
1223 &io_subchannel_attr_group);
1225 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1226 "attributes for subchannel "
1227 "0.%x.%04x (rc=%d)\n",
1228 sch->schid.ssid, sch->schid.sch_no, rc);
1230 * This subchannel already has an associated ccw_device.
1231 * Throw the delayed uevent for the subchannel, register
1232 * the ccw_device and exit. This happens for all early
1233 * devices, e.g. the console.
1235 dev_set_uevent_suppress(&sch->dev, 0);
1236 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1237 cdev->dev.groups = ccwdev_attr_groups;
1238 device_initialize(&cdev->dev);
1239 ccw_device_register(cdev);
1241 * Check if the device is already online. If it is
1242 * the reference count needs to be corrected since we
1243 * didn't obtain a reference in ccw_device_set_online.
1245 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1246 cdev->private->state != DEV_STATE_OFFLINE &&
1247 cdev->private->state != DEV_STATE_BOXED)
1248 get_device(&cdev->dev);
1251 io_subchannel_init_fields(sch);
1252 rc = cio_commit_config(sch);
1255 rc = sysfs_create_group(&sch->dev.kobj,
1256 &io_subchannel_attr_group);
1259 /* Allocate I/O subchannel private data. */
1260 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1261 GFP_KERNEL | GFP_DMA);
1265 * First check if a fitting device may be found amongst the
1266 * disconnected devices or in the orphanage.
1268 dev_id.devno = sch->schib.pmcw.dev;
1269 dev_id.ssid = sch->schid.ssid;
1270 cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
1272 cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
1276 * Schedule moving the device until when we have a registered
1277 * subchannel to move to and succeed the probe. We can
1278 * unregister later again, when the probe is through.
1280 cdev->private->sch = sch;
1281 PREPARE_WORK(&cdev->private->kick_work,
1282 ccw_device_move_to_sch);
1283 queue_work(slow_path_wq, &cdev->private->kick_work);
1286 cdev = io_subchannel_create_ccwdev(sch);
1289 rc = io_subchannel_recog(cdev, sch);
1291 spin_lock_irqsave(sch->lock, flags);
1292 io_subchannel_recog_done(cdev);
1293 spin_unlock_irqrestore(sch->lock, flags);
1297 kfree(sch->private);
1298 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1300 io_subchannel_schedule_removal(sch);
1305 io_subchannel_remove (struct subchannel *sch)
1307 struct ccw_device *cdev;
1308 unsigned long flags;
1310 cdev = sch_get_cdev(sch);
1313 /* Set ccw device to not operational and drop reference. */
1314 spin_lock_irqsave(cdev->ccwlock, flags);
1315 sch_set_cdev(sch, NULL);
1316 cdev->private->state = DEV_STATE_NOT_OPER;
1317 spin_unlock_irqrestore(cdev->ccwlock, flags);
1318 ccw_device_unregister(cdev);
1319 put_device(&cdev->dev);
1320 kfree(sch->private);
1321 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1325 static int io_subchannel_notify(struct subchannel *sch, int event)
1327 struct ccw_device *cdev;
1329 cdev = sch_get_cdev(sch);
1332 return ccw_device_notify(cdev, event);
1335 static void io_subchannel_verify(struct subchannel *sch)
1337 struct ccw_device *cdev;
1339 cdev = sch_get_cdev(sch);
1341 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1344 static int check_for_io_on_path(struct subchannel *sch, int mask)
1346 if (cio_update_schib(sch))
1348 if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask)
1353 static void terminate_internal_io(struct subchannel *sch,
1354 struct ccw_device *cdev)
1356 if (cio_clear(sch)) {
1357 /* Recheck device in case clear failed. */
1360 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1362 css_schedule_eval(sch->schid);
1365 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
1366 /* Request retry of internal operation. */
1367 cdev->private->flags.intretry = 1;
1370 cdev->handler(cdev, cdev->private->intparm,
1374 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1376 struct ccw_device *cdev;
1378 cdev = sch_get_cdev(sch);
1381 if (check_for_io_on_path(sch, mask)) {
1382 if (cdev->private->state == DEV_STATE_ONLINE)
1383 ccw_device_kill_io(cdev);
1385 terminate_internal_io(sch, cdev);
1386 /* Re-start path verification. */
1387 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1390 /* trigger path verification. */
1391 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1395 static int io_subchannel_chp_event(struct subchannel *sch,
1396 struct chp_link *link, int event)
1400 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1407 io_subchannel_terminate_path(sch, mask);
1412 io_subchannel_verify(sch);
1415 if (cio_update_schib(sch))
1417 io_subchannel_terminate_path(sch, mask);
1420 if (cio_update_schib(sch))
1422 sch->lpm |= mask & sch->opm;
1423 io_subchannel_verify(sch);
1430 io_subchannel_shutdown(struct subchannel *sch)
1432 struct ccw_device *cdev;
1435 cdev = sch_get_cdev(sch);
1437 if (cio_is_console(sch->schid))
1439 if (!sch->schib.pmcw.ena)
1440 /* Nothing to do. */
1442 ret = cio_disable_subchannel(sch);
1444 /* Subchannel is disabled, we're done. */
1446 cdev->private->state = DEV_STATE_QUIESCE;
1448 cdev->handler(cdev, cdev->private->intparm,
1450 ret = ccw_device_cancel_halt_clear(cdev);
1451 if (ret == -EBUSY) {
1452 ccw_device_set_timeout(cdev, HZ/10);
1453 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1455 cio_disable_subchannel(sch);
1458 static int io_subchannel_get_status(struct subchannel *sch)
1462 if (stsch(sch->schid, &schib) || !schib.pmcw.dnv)
1464 if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev))
1465 return CIO_REVALIDATE;
1471 static int device_is_disconnected(struct ccw_device *cdev)
1475 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1476 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1479 static int recovery_check(struct device *dev, void *data)
1481 struct ccw_device *cdev = to_ccwdev(dev);
1484 spin_lock_irq(cdev->ccwlock);
1485 switch (cdev->private->state) {
1486 case DEV_STATE_DISCONNECTED:
1487 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1488 cdev->private->dev_id.ssid,
1489 cdev->private->dev_id.devno);
1490 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1493 case DEV_STATE_DISCONNECTED_SENSE_ID:
1497 spin_unlock_irq(cdev->ccwlock);
1502 static void recovery_work_func(struct work_struct *unused)
1506 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1508 spin_lock_irq(&recovery_lock);
1509 if (!timer_pending(&recovery_timer)) {
1510 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1512 mod_timer(&recovery_timer, jiffies +
1513 recovery_delay[recovery_phase] * HZ);
1515 spin_unlock_irq(&recovery_lock);
1517 CIO_MSG_EVENT(4, "recovery: end\n");
1520 static DECLARE_WORK(recovery_work, recovery_work_func);
1522 static void recovery_func(unsigned long data)
1525 * We can't do our recovery in softirq context and it's not
1526 * performance critical, so we schedule it.
1528 schedule_work(&recovery_work);
1531 static void ccw_device_schedule_recovery(void)
1533 unsigned long flags;
1535 CIO_MSG_EVENT(4, "recovery: schedule\n");
1536 spin_lock_irqsave(&recovery_lock, flags);
1537 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1539 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1541 spin_unlock_irqrestore(&recovery_lock, flags);
1544 static int purge_fn(struct device *dev, void *data)
1546 struct ccw_device *cdev = to_ccwdev(dev);
1547 struct ccw_device_private *priv = cdev->private;
1550 spin_lock_irq(cdev->ccwlock);
1551 unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) &&
1552 (priv->state == DEV_STATE_OFFLINE);
1553 spin_unlock_irq(cdev->ccwlock);
1556 if (!get_device(&cdev->dev))
1558 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid,
1559 priv->dev_id.devno);
1560 PREPARE_WORK(&cdev->private->kick_work, ccw_device_call_sch_unregister);
1561 queue_work(slow_path_wq, &cdev->private->kick_work);
1564 /* Abort loop in case of pending signal. */
1565 if (signal_pending(current))
1572 * ccw_purge_blacklisted - purge unused, blacklisted devices
1574 * Unregister all ccw devices that are offline and on the blacklist.
1576 int ccw_purge_blacklisted(void)
1578 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1579 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1583 static void device_set_disconnected(struct ccw_device *cdev)
1587 ccw_device_set_timeout(cdev, 0);
1588 cdev->private->flags.fake_irb = 0;
1589 cdev->private->state = DEV_STATE_DISCONNECTED;
1591 ccw_device_schedule_recovery();
1594 void ccw_device_set_notoper(struct ccw_device *cdev)
1596 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1598 CIO_TRACE_EVENT(2, "notoper");
1599 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1600 ccw_device_set_timeout(cdev, 0);
1601 cio_disable_subchannel(sch);
1602 cdev->private->state = DEV_STATE_NOT_OPER;
1605 static int io_subchannel_sch_event(struct subchannel *sch, int slow)
1607 int event, ret, disc;
1608 unsigned long flags;
1609 enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action;
1610 struct ccw_device *cdev;
1612 spin_lock_irqsave(sch->lock, flags);
1613 cdev = sch_get_cdev(sch);
1614 disc = device_is_disconnected(cdev);
1616 /* Disconnected devices are evaluated directly only.*/
1617 spin_unlock_irqrestore(sch->lock, flags);
1620 /* No interrupt after machine check - kill pending timers. */
1622 ccw_device_set_timeout(cdev, 0);
1623 if (!disc && !slow) {
1624 /* Non-disconnected devices are evaluated on the slow path. */
1625 spin_unlock_irqrestore(sch->lock, flags);
1628 event = io_subchannel_get_status(sch);
1629 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1630 sch->schid.ssid, sch->schid.sch_no, event,
1631 disc ? "disconnected" : "normal",
1632 slow ? "slow" : "fast");
1633 /* Analyze subchannel status. */
1638 /* Check if paths have become available. */
1644 /* Ask driver what to do with device. */
1645 if (io_subchannel_notify(sch, event))
1648 action = UNREGISTER;
1650 case CIO_REVALIDATE:
1651 /* Device will be removed, so no notify necessary. */
1653 /* Reprobe because immediate unregister might block. */
1656 action = UNREGISTER_PROBE;
1660 /* Get device operational again. */
1664 /* Perform action. */
1668 case UNREGISTER_PROBE:
1669 ccw_device_set_notoper(cdev);
1670 /* Unregister device (will use subchannel lock). */
1671 spin_unlock_irqrestore(sch->lock, flags);
1672 css_sch_device_unregister(sch);
1673 spin_lock_irqsave(sch->lock, flags);
1675 /* Reset intparm to zeroes. */
1676 sch->config.intparm = 0;
1677 cio_commit_config(sch);
1680 ccw_device_trigger_reprobe(cdev);
1683 device_set_disconnected(cdev);
1688 spin_unlock_irqrestore(sch->lock, flags);
1689 /* Probe if necessary. */
1690 if (action == UNREGISTER_PROBE)
1691 ret = css_probe_device(sch->schid);
1696 #ifdef CONFIG_CCW_CONSOLE
1697 static struct ccw_device console_cdev;
1698 static char console_cdev_name[10] = "0.x.xxxx";
1699 static struct ccw_device_private console_private;
1700 static int console_cdev_in_use;
1702 static DEFINE_SPINLOCK(ccw_console_lock);
1704 spinlock_t * cio_get_console_lock(void)
1706 return &ccw_console_lock;
1709 static int ccw_device_console_enable(struct ccw_device *cdev,
1710 struct subchannel *sch)
1714 /* Attach subchannel private data. */
1715 sch->private = cio_get_console_priv();
1716 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1717 io_subchannel_init_fields(sch);
1718 rc = cio_commit_config(sch);
1721 sch->driver = &io_subchannel_driver;
1722 /* Initialize the ccw_device structure. */
1723 cdev->dev.parent= &sch->dev;
1724 rc = io_subchannel_recog(cdev, sch);
1728 /* Now wait for the async. recognition to come to an end. */
1729 spin_lock_irq(cdev->ccwlock);
1730 while (!dev_fsm_final_state(cdev))
1733 if (cdev->private->state != DEV_STATE_OFFLINE)
1735 ccw_device_online(cdev);
1736 while (!dev_fsm_final_state(cdev))
1738 if (cdev->private->state != DEV_STATE_ONLINE)
1742 spin_unlock_irq(cdev->ccwlock);
1747 ccw_device_probe_console(void)
1749 struct subchannel *sch;
1752 if (xchg(&console_cdev_in_use, 1) != 0)
1753 return ERR_PTR(-EBUSY);
1754 sch = cio_probe_console();
1756 console_cdev_in_use = 0;
1757 return (void *) sch;
1759 memset(&console_cdev, 0, sizeof(struct ccw_device));
1760 memset(&console_private, 0, sizeof(struct ccw_device_private));
1761 console_cdev.private = &console_private;
1762 console_private.cdev = &console_cdev;
1763 ret = ccw_device_console_enable(&console_cdev, sch);
1765 cio_release_console();
1766 console_cdev_in_use = 0;
1767 return ERR_PTR(ret);
1769 console_cdev.online = 1;
1770 return &console_cdev;
1774 const char *cio_get_console_cdev_name(struct subchannel *sch)
1776 snprintf(console_cdev_name, 10, "0.%x.%04x",
1777 sch->schid.ssid, sch->schib.pmcw.dev);
1778 return (const char *)console_cdev_name;
1783 * get ccw_device matching the busid, but only if owned by cdrv
1786 __ccwdev_check_busid(struct device *dev, void *id)
1792 return (strcmp(bus_id, dev_name(dev)) == 0);
1797 * get_ccwdev_by_busid() - obtain device from a bus id
1798 * @cdrv: driver the device is owned by
1799 * @bus_id: bus id of the device to be searched
1801 * This function searches all devices owned by @cdrv for a device with a bus
1802 * id matching @bus_id.
1804 * If a match is found, its reference count of the found device is increased
1805 * and it is returned; else %NULL is returned.
1807 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1811 struct device_driver *drv;
1813 drv = get_driver(&cdrv->driver);
1817 dev = driver_find_device(drv, NULL, (void *)bus_id,
1818 __ccwdev_check_busid);
1821 return dev ? to_ccwdev(dev) : NULL;
1824 /************************** device driver handling ************************/
1826 /* This is the implementation of the ccw_driver class. The probe, remove
1827 * and release methods are initially very similar to the device_driver
1828 * implementations, with the difference that they have ccw_device
1831 * A ccw driver also contains the information that is needed for
1835 ccw_device_probe (struct device *dev)
1837 struct ccw_device *cdev = to_ccwdev(dev);
1838 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1841 cdev->drv = cdrv; /* to let the driver call _set_online */
1843 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1854 ccw_device_remove (struct device *dev)
1856 struct ccw_device *cdev = to_ccwdev(dev);
1857 struct ccw_driver *cdrv = cdev->drv;
1864 spin_lock_irq(cdev->ccwlock);
1865 ret = ccw_device_offline(cdev);
1866 spin_unlock_irq(cdev->ccwlock);
1868 wait_event(cdev->private->wait_q,
1869 dev_fsm_final_state(cdev));
1871 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1872 "device 0.%x.%04x\n",
1873 ret, cdev->private->dev_id.ssid,
1874 cdev->private->dev_id.devno);
1875 /* Give up reference obtained in ccw_device_set_online(). */
1876 put_device(&cdev->dev);
1878 ccw_device_set_timeout(cdev, 0);
1883 static void ccw_device_shutdown(struct device *dev)
1885 struct ccw_device *cdev;
1887 cdev = to_ccwdev(dev);
1888 if (cdev->drv && cdev->drv->shutdown)
1889 cdev->drv->shutdown(cdev);
1893 struct bus_type ccw_bus_type = {
1895 .match = ccw_bus_match,
1896 .uevent = ccw_uevent,
1897 .probe = ccw_device_probe,
1898 .remove = ccw_device_remove,
1899 .shutdown = ccw_device_shutdown,
1903 * ccw_driver_register() - register a ccw driver
1904 * @cdriver: driver to be registered
1906 * This function is mainly a wrapper around driver_register().
1908 * %0 on success and a negative error value on failure.
1910 int ccw_driver_register(struct ccw_driver *cdriver)
1912 struct device_driver *drv = &cdriver->driver;
1914 drv->bus = &ccw_bus_type;
1915 drv->name = cdriver->name;
1916 drv->owner = cdriver->owner;
1918 return driver_register(drv);
1922 * ccw_driver_unregister() - deregister a ccw driver
1923 * @cdriver: driver to be deregistered
1925 * This function is mainly a wrapper around driver_unregister().
1927 void ccw_driver_unregister(struct ccw_driver *cdriver)
1929 driver_unregister(&cdriver->driver);
1932 /* Helper func for qdio. */
1933 struct subchannel_id
1934 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1936 struct subchannel *sch;
1938 sch = to_subchannel(cdev->dev.parent);
1942 MODULE_LICENSE("GPL");
1943 EXPORT_SYMBOL(ccw_device_set_online);
1944 EXPORT_SYMBOL(ccw_device_set_offline);
1945 EXPORT_SYMBOL(ccw_driver_register);
1946 EXPORT_SYMBOL(ccw_driver_unregister);
1947 EXPORT_SYMBOL(get_ccwdev_by_busid);
1948 EXPORT_SYMBOL(ccw_bus_type);
1949 EXPORT_SYMBOL(ccw_device_work);
1950 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);