2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
7 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
8 * Cornelia Huck (cornelia.huck@de.ibm.com)
9 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/spinlock.h>
14 #include <linux/errno.h>
15 #include <linux/err.h>
16 #include <linux/slab.h>
17 #include <linux/list.h>
18 #include <linux/device.h>
19 #include <linux/workqueue.h>
21 #include <asm/ccwdev.h>
23 #include <asm/param.h> /* HZ */
26 #include "cio_debug.h"
31 /******************* bus type handling ***********************/
33 /* The Linux driver model distinguishes between a bus type and
34 * the bus itself. Of course we only have one channel
35 * subsystem driver and one channel system per machine, but
36 * we still use the abstraction. T.R. says it's a good idea. */
38 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
40 struct ccw_device
*cdev
= to_ccwdev(dev
);
41 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
42 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
47 found
= ccw_device_id_match(ids
, &cdev
->id
);
51 cdev
->id
.driver_info
= found
->driver_info
;
56 /* Store modalias string delimited by prefix/suffix string into buffer with
57 * specified size. Return length of resulting string (excluding trailing '\0')
58 * even if string doesn't fit buffer (snprintf semantics). */
59 static int snprint_alias(char *buf
, size_t size
,
60 struct ccw_device_id
*id
, const char *suffix
)
64 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
70 if (id
->dev_type
!= 0)
71 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
72 id
->dev_model
, suffix
);
74 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
79 /* Set up environment variables for ccw device uevent. Return 0 on success,
80 * non-zero otherwise. */
81 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
83 struct ccw_device
*cdev
= to_ccwdev(dev
);
84 struct ccw_device_id
*id
= &(cdev
->id
);
86 char modalias_buf
[30];
89 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
94 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
98 /* The next two can be zero, that's ok for us */
100 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
105 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
110 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
111 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
115 struct bus_type ccw_bus_type
;
117 static int io_subchannel_probe (struct subchannel
*);
118 static int io_subchannel_remove (struct subchannel
*);
119 static int io_subchannel_notify(struct device
*, int);
120 static void io_subchannel_verify(struct device
*);
121 static void io_subchannel_ioterm(struct device
*);
122 static void io_subchannel_shutdown(struct subchannel
*);
124 static struct css_driver io_subchannel_driver
= {
125 .subchannel_type
= SUBCHANNEL_TYPE_IO
,
127 .name
= "io_subchannel",
128 .bus
= &css_bus_type
,
130 .irq
= io_subchannel_irq
,
131 .notify
= io_subchannel_notify
,
132 .verify
= io_subchannel_verify
,
133 .termination
= io_subchannel_ioterm
,
134 .probe
= io_subchannel_probe
,
135 .remove
= io_subchannel_remove
,
136 .shutdown
= io_subchannel_shutdown
,
139 struct workqueue_struct
*ccw_device_work
;
140 struct workqueue_struct
*ccw_device_notify_work
;
141 wait_queue_head_t ccw_device_init_wq
;
142 atomic_t ccw_device_init_count
;
145 init_ccw_bus_type (void)
149 init_waitqueue_head(&ccw_device_init_wq
);
150 atomic_set(&ccw_device_init_count
, 0);
152 ccw_device_work
= create_singlethread_workqueue("cio");
153 if (!ccw_device_work
)
154 return -ENOMEM
; /* FIXME: better errno ? */
155 ccw_device_notify_work
= create_singlethread_workqueue("cio_notify");
156 if (!ccw_device_notify_work
) {
157 ret
= -ENOMEM
; /* FIXME: better errno ? */
160 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
162 ret
= -ENOMEM
; /* FIXME: better errno ? */
165 if ((ret
= bus_register (&ccw_bus_type
)))
168 if ((ret
= driver_register(&io_subchannel_driver
.drv
)))
171 wait_event(ccw_device_init_wq
,
172 atomic_read(&ccw_device_init_count
) == 0);
173 flush_workqueue(ccw_device_work
);
177 destroy_workqueue(ccw_device_work
);
178 if (ccw_device_notify_work
)
179 destroy_workqueue(ccw_device_notify_work
);
181 destroy_workqueue(slow_path_wq
);
186 cleanup_ccw_bus_type (void)
188 driver_unregister(&io_subchannel_driver
.drv
);
189 bus_unregister(&ccw_bus_type
);
190 destroy_workqueue(ccw_device_notify_work
);
191 destroy_workqueue(ccw_device_work
);
194 subsys_initcall(init_ccw_bus_type
);
195 module_exit(cleanup_ccw_bus_type
);
197 /************************ device handling **************************/
200 * A ccw_device has some interfaces in sysfs in addition to the
202 * The following entries are designed to export the information which
203 * resided in 2.4 in /proc/subchannels. Subchannel and device number
204 * are obvious, so they don't have an entry :)
205 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
208 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
210 struct subchannel
*sch
= to_subchannel(dev
);
211 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
216 for (chp
= 0; chp
< 8; chp
++) {
218 if (ssd
->path_mask
& mask
)
219 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
221 ret
+= sprintf(buf
+ ret
, "00 ");
223 ret
+= sprintf (buf
+ret
, "\n");
224 return min((ssize_t
)PAGE_SIZE
, ret
);
228 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
230 struct subchannel
*sch
= to_subchannel(dev
);
231 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
233 return sprintf (buf
, "%02x %02x %02x\n",
234 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
238 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
240 struct ccw_device
*cdev
= to_ccwdev(dev
);
241 struct ccw_device_id
*id
= &(cdev
->id
);
243 if (id
->dev_type
!= 0)
244 return sprintf(buf
, "%04x/%02x\n",
245 id
->dev_type
, id
->dev_model
);
247 return sprintf(buf
, "n/a\n");
251 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
253 struct ccw_device
*cdev
= to_ccwdev(dev
);
254 struct ccw_device_id
*id
= &(cdev
->id
);
256 return sprintf(buf
, "%04x/%02x\n",
257 id
->cu_type
, id
->cu_model
);
261 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
263 struct ccw_device
*cdev
= to_ccwdev(dev
);
264 struct ccw_device_id
*id
= &(cdev
->id
);
267 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
269 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
273 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
275 struct ccw_device
*cdev
= to_ccwdev(dev
);
277 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
280 int ccw_device_is_orphan(struct ccw_device
*cdev
)
282 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
285 static void ccw_device_unregister(struct ccw_device
*cdev
)
287 if (test_and_clear_bit(1, &cdev
->private->registered
))
288 device_del(&cdev
->dev
);
291 static void ccw_device_remove_orphan_cb(struct device
*dev
)
293 struct ccw_device
*cdev
= to_ccwdev(dev
);
295 ccw_device_unregister(cdev
);
296 put_device(&cdev
->dev
);
299 static void ccw_device_remove_sch_cb(struct device
*dev
)
301 struct subchannel
*sch
;
303 sch
= to_subchannel(dev
);
304 css_sch_device_unregister(sch
);
305 /* Reset intparm to zeroes. */
306 sch
->schib
.pmcw
.intparm
= 0;
308 put_device(&sch
->dev
);
312 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
318 * Forced offline in disconnected state means
319 * 'throw away device'.
321 if (ccw_device_is_orphan(cdev
)) {
323 * Deregister ccw device.
324 * Unfortunately, we cannot do this directly from the
327 spin_lock_irqsave(cdev
->ccwlock
, flags
);
328 cdev
->private->state
= DEV_STATE_NOT_OPER
;
329 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
330 rc
= device_schedule_callback(&cdev
->dev
,
331 ccw_device_remove_orphan_cb
);
333 CIO_MSG_EVENT(2, "Couldn't unregister orphan "
335 cdev
->private->dev_id
.ssid
,
336 cdev
->private->dev_id
.devno
);
339 /* Deregister subchannel, which will kill the ccw device. */
340 rc
= device_schedule_callback(cdev
->dev
.parent
,
341 ccw_device_remove_sch_cb
);
343 CIO_MSG_EVENT(2, "Couldn't unregister disconnected device "
345 cdev
->private->dev_id
.ssid
,
346 cdev
->private->dev_id
.devno
);
350 ccw_device_set_offline(struct ccw_device
*cdev
)
356 if (!cdev
->online
|| !cdev
->drv
)
359 if (cdev
->drv
->set_offline
) {
360 ret
= cdev
->drv
->set_offline(cdev
);
365 spin_lock_irq(cdev
->ccwlock
);
366 ret
= ccw_device_offline(cdev
);
367 if (ret
== -ENODEV
) {
368 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
369 cdev
->private->state
= DEV_STATE_OFFLINE
;
370 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
372 spin_unlock_irq(cdev
->ccwlock
);
375 spin_unlock_irq(cdev
->ccwlock
);
377 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
379 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
380 "device 0.%x.%04x\n",
381 ret
, cdev
->private->dev_id
.ssid
,
382 cdev
->private->dev_id
.devno
);
389 ccw_device_set_online(struct ccw_device
*cdev
)
395 if (cdev
->online
|| !cdev
->drv
)
398 spin_lock_irq(cdev
->ccwlock
);
399 ret
= ccw_device_online(cdev
);
400 spin_unlock_irq(cdev
->ccwlock
);
402 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
404 CIO_MSG_EVENT(2, "ccw_device_online returned %d, "
405 "device 0.%x.%04x\n",
406 ret
, cdev
->private->dev_id
.ssid
,
407 cdev
->private->dev_id
.devno
);
410 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
412 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
416 spin_lock_irq(cdev
->ccwlock
);
417 ret
= ccw_device_offline(cdev
);
418 spin_unlock_irq(cdev
->ccwlock
);
420 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
422 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
423 "device 0.%x.%04x\n",
424 ret
, cdev
->private->dev_id
.ssid
,
425 cdev
->private->dev_id
.devno
);
426 return (ret
== 0) ? -ENODEV
: ret
;
429 static void online_store_handle_offline(struct ccw_device
*cdev
)
431 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
432 ccw_device_remove_disconnected(cdev
);
433 else if (cdev
->drv
&& cdev
->drv
->set_offline
)
434 ccw_device_set_offline(cdev
);
437 static int online_store_recog_and_online(struct ccw_device
*cdev
)
441 /* Do device recognition, if needed. */
442 if (cdev
->id
.cu_type
== 0) {
443 ret
= ccw_device_recognition(cdev
);
445 CIO_MSG_EVENT(0, "Couldn't start recognition "
446 "for device 0.%x.%04x (ret=%d)\n",
447 cdev
->private->dev_id
.ssid
,
448 cdev
->private->dev_id
.devno
, ret
);
451 wait_event(cdev
->private->wait_q
,
452 cdev
->private->flags
.recog_done
);
454 if (cdev
->drv
&& cdev
->drv
->set_online
)
455 ccw_device_set_online(cdev
);
458 static void online_store_handle_online(struct ccw_device
*cdev
, int force
)
462 ret
= online_store_recog_and_online(cdev
);
465 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
466 ret
= ccw_device_stlck(cdev
);
469 "ccw_device_stlck returned %d!\n", ret
);
472 if (cdev
->id
.cu_type
== 0)
473 cdev
->private->state
= DEV_STATE_NOT_OPER
;
474 online_store_recog_and_online(cdev
);
479 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
480 const char *buf
, size_t count
)
482 struct ccw_device
*cdev
= to_ccwdev(dev
);
486 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
489 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
490 atomic_set(&cdev
->private->onoff
, 0);
493 if (!strncmp(buf
, "force\n", count
)) {
498 i
= simple_strtoul(buf
, &tmp
, 16);
503 online_store_handle_offline(cdev
);
506 online_store_handle_online(cdev
, force
);
512 module_put(cdev
->drv
->owner
);
513 atomic_set(&cdev
->private->onoff
, 0);
518 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
520 struct ccw_device
*cdev
= to_ccwdev(dev
);
521 struct subchannel
*sch
;
523 if (ccw_device_is_orphan(cdev
))
524 return sprintf(buf
, "no device\n");
525 switch (cdev
->private->state
) {
526 case DEV_STATE_BOXED
:
527 return sprintf(buf
, "boxed\n");
528 case DEV_STATE_DISCONNECTED
:
529 case DEV_STATE_DISCONNECTED_SENSE_ID
:
530 case DEV_STATE_NOT_OPER
:
531 sch
= to_subchannel(dev
->parent
);
533 return sprintf(buf
, "no path\n");
535 return sprintf(buf
, "no device\n");
537 /* All other states considered fine. */
538 return sprintf(buf
, "good\n");
542 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
543 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
544 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
545 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
546 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
547 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
548 extern struct device_attribute dev_attr_cmb_enable
;
549 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
551 static struct attribute
* subch_attrs
[] = {
552 &dev_attr_chpids
.attr
,
553 &dev_attr_pimpampom
.attr
,
557 static struct attribute_group subch_attr_group
= {
558 .attrs
= subch_attrs
,
561 struct attribute_group
*subch_attr_groups
[] = {
566 static struct attribute
* ccwdev_attrs
[] = {
567 &dev_attr_devtype
.attr
,
568 &dev_attr_cutype
.attr
,
569 &dev_attr_modalias
.attr
,
570 &dev_attr_online
.attr
,
571 &dev_attr_cmb_enable
.attr
,
572 &dev_attr_availability
.attr
,
576 static struct attribute_group ccwdev_attr_group
= {
577 .attrs
= ccwdev_attrs
,
580 static struct attribute_group
*ccwdev_attr_groups
[] = {
585 /* this is a simple abstraction for device_register that sets the
586 * correct bus type and adds the bus specific files */
587 static int ccw_device_register(struct ccw_device
*cdev
)
589 struct device
*dev
= &cdev
->dev
;
592 dev
->bus
= &ccw_bus_type
;
594 if ((ret
= device_add(dev
)))
597 set_bit(1, &cdev
->private->registered
);
602 struct ccw_dev_id dev_id
;
603 struct ccw_device
* sibling
;
607 match_devno(struct device
* dev
, void * data
)
609 struct match_data
* d
= data
;
610 struct ccw_device
* cdev
;
612 cdev
= to_ccwdev(dev
);
613 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
614 !ccw_device_is_orphan(cdev
) &&
615 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
616 (cdev
!= d
->sibling
))
621 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
622 struct ccw_device
*sibling
)
625 struct match_data data
;
627 data
.dev_id
= *dev_id
;
628 data
.sibling
= sibling
;
629 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
631 return dev
? to_ccwdev(dev
) : NULL
;
634 static int match_orphan(struct device
*dev
, void *data
)
636 struct ccw_dev_id
*dev_id
;
637 struct ccw_device
*cdev
;
640 cdev
= to_ccwdev(dev
);
641 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
644 static struct ccw_device
*
645 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
646 struct ccw_dev_id
*dev_id
)
650 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
653 return dev
? to_ccwdev(dev
) : NULL
;
657 ccw_device_add_changed(struct work_struct
*work
)
659 struct ccw_device_private
*priv
;
660 struct ccw_device
*cdev
;
662 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
664 if (device_add(&cdev
->dev
)) {
665 put_device(&cdev
->dev
);
668 set_bit(1, &cdev
->private->registered
);
671 void ccw_device_do_unreg_rereg(struct work_struct
*work
)
673 struct ccw_device_private
*priv
;
674 struct ccw_device
*cdev
;
675 struct subchannel
*sch
;
677 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
679 sch
= to_subchannel(cdev
->dev
.parent
);
681 ccw_device_unregister(cdev
);
682 PREPARE_WORK(&cdev
->private->kick_work
,
683 ccw_device_add_changed
);
684 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
688 ccw_device_release(struct device
*dev
)
690 struct ccw_device
*cdev
;
692 cdev
= to_ccwdev(dev
);
693 kfree(cdev
->private);
697 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
699 struct ccw_device
*cdev
;
701 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
703 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
704 GFP_KERNEL
| GFP_DMA
);
709 return ERR_PTR(-ENOMEM
);
712 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
713 struct ccw_device
*cdev
)
715 cdev
->private->cdev
= cdev
;
716 atomic_set(&cdev
->private->onoff
, 0);
717 cdev
->dev
.parent
= &sch
->dev
;
718 cdev
->dev
.release
= ccw_device_release
;
719 INIT_LIST_HEAD(&cdev
->private->kick_work
.entry
);
720 cdev
->dev
.groups
= ccwdev_attr_groups
;
721 /* Do first half of device_register. */
722 device_initialize(&cdev
->dev
);
723 if (!get_device(&sch
->dev
)) {
724 if (cdev
->dev
.release
)
725 cdev
->dev
.release(&cdev
->dev
);
731 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
733 struct ccw_device
*cdev
;
736 cdev
= io_subchannel_allocate_dev(sch
);
738 ret
= io_subchannel_initialize_dev(sch
, cdev
);
747 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
749 static void sch_attach_device(struct subchannel
*sch
,
750 struct ccw_device
*cdev
)
752 css_update_ssd_info(sch
);
753 spin_lock_irq(sch
->lock
);
754 sch
->dev
.driver_data
= cdev
;
755 cdev
->private->schid
= sch
->schid
;
756 cdev
->ccwlock
= sch
->lock
;
757 device_trigger_reprobe(sch
);
758 spin_unlock_irq(sch
->lock
);
761 static void sch_attach_disconnected_device(struct subchannel
*sch
,
762 struct ccw_device
*cdev
)
764 struct subchannel
*other_sch
;
767 other_sch
= to_subchannel(get_device(cdev
->dev
.parent
));
768 ret
= device_move(&cdev
->dev
, &sch
->dev
);
770 CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
771 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
772 cdev
->private->dev_id
.devno
, ret
);
773 put_device(&other_sch
->dev
);
776 other_sch
->dev
.driver_data
= NULL
;
777 /* No need to keep a subchannel without ccw device around. */
778 css_sch_device_unregister(other_sch
);
779 put_device(&other_sch
->dev
);
780 sch_attach_device(sch
, cdev
);
783 static void sch_attach_orphaned_device(struct subchannel
*sch
,
784 struct ccw_device
*cdev
)
788 /* Try to move the ccw device to its new subchannel. */
789 ret
= device_move(&cdev
->dev
, &sch
->dev
);
791 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
792 "failed (ret=%d)!\n",
793 cdev
->private->dev_id
.ssid
,
794 cdev
->private->dev_id
.devno
, ret
);
797 sch_attach_device(sch
, cdev
);
800 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
802 struct ccw_device
*cdev
;
804 /* Need to allocate a new ccw device. */
805 cdev
= io_subchannel_create_ccwdev(sch
);
807 /* OK, we did everything we could... */
808 css_sch_device_unregister(sch
);
811 spin_lock_irq(sch
->lock
);
812 sch
->dev
.driver_data
= cdev
;
813 spin_unlock_irq(sch
->lock
);
814 /* Start recognition for the new ccw device. */
815 if (io_subchannel_recog(cdev
, sch
)) {
816 spin_lock_irq(sch
->lock
);
817 sch
->dev
.driver_data
= NULL
;
818 spin_unlock_irq(sch
->lock
);
819 if (cdev
->dev
.release
)
820 cdev
->dev
.release(&cdev
->dev
);
821 css_sch_device_unregister(sch
);
826 void ccw_device_move_to_orphanage(struct work_struct
*work
)
828 struct ccw_device_private
*priv
;
829 struct ccw_device
*cdev
;
830 struct ccw_device
*replacing_cdev
;
831 struct subchannel
*sch
;
833 struct channel_subsystem
*css
;
834 struct ccw_dev_id dev_id
;
836 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
838 sch
= to_subchannel(cdev
->dev
.parent
);
839 css
= to_css(sch
->dev
.parent
);
840 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
841 dev_id
.ssid
= sch
->schid
.ssid
;
844 * Move the orphaned ccw device to the orphanage so the replacing
845 * ccw device can take its place on the subchannel.
847 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
);
849 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
850 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
851 cdev
->private->dev_id
.devno
, ret
);
854 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
856 * Search for the replacing ccw device
857 * - among the disconnected devices
860 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
861 if (replacing_cdev
) {
862 sch_attach_disconnected_device(sch
, replacing_cdev
);
865 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
866 if (replacing_cdev
) {
867 sch_attach_orphaned_device(sch
, replacing_cdev
);
870 sch_create_and_recog_new_device(sch
);
874 * Register recognized device.
877 io_subchannel_register(struct work_struct
*work
)
879 struct ccw_device_private
*priv
;
880 struct ccw_device
*cdev
;
881 struct subchannel
*sch
;
885 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
887 sch
= to_subchannel(cdev
->dev
.parent
);
888 css_update_ssd_info(sch
);
890 * io_subchannel_register() will also be called after device
891 * recognition has been done for a boxed device (which will already
892 * be registered). We need to reprobe since we may now have sense id
895 if (klist_node_attached(&cdev
->dev
.knode_parent
)) {
897 ret
= device_reprobe(&cdev
->dev
);
899 /* We can't do much here. */
900 CIO_MSG_EVENT(2, "device_reprobe() returned"
901 " %d for 0.%x.%04x\n", ret
,
902 cdev
->private->dev_id
.ssid
,
903 cdev
->private->dev_id
.devno
);
908 * Now we know this subchannel will stay, we can throw
909 * our delayed uevent.
911 sch
->dev
.uevent_suppress
= 0;
912 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
913 /* make it known to the system */
914 ret
= ccw_device_register(cdev
);
916 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
917 cdev
->private->dev_id
.ssid
,
918 cdev
->private->dev_id
.devno
, ret
);
919 put_device(&cdev
->dev
);
920 spin_lock_irqsave(sch
->lock
, flags
);
921 sch
->dev
.driver_data
= NULL
;
922 spin_unlock_irqrestore(sch
->lock
, flags
);
923 kfree (cdev
->private);
925 put_device(&sch
->dev
);
926 if (atomic_dec_and_test(&ccw_device_init_count
))
927 wake_up(&ccw_device_init_wq
);
930 put_device(&cdev
->dev
);
932 cdev
->private->flags
.recog_done
= 1;
933 put_device(&sch
->dev
);
934 wake_up(&cdev
->private->wait_q
);
935 if (atomic_dec_and_test(&ccw_device_init_count
))
936 wake_up(&ccw_device_init_wq
);
940 ccw_device_call_sch_unregister(struct work_struct
*work
)
942 struct ccw_device_private
*priv
;
943 struct ccw_device
*cdev
;
944 struct subchannel
*sch
;
946 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
948 sch
= to_subchannel(cdev
->dev
.parent
);
949 css_sch_device_unregister(sch
);
950 /* Reset intparm to zeroes. */
951 sch
->schib
.pmcw
.intparm
= 0;
953 put_device(&cdev
->dev
);
954 put_device(&sch
->dev
);
958 * subchannel recognition done. Called from the state machine.
961 io_subchannel_recog_done(struct ccw_device
*cdev
)
963 struct subchannel
*sch
;
965 if (css_init_done
== 0) {
966 cdev
->private->flags
.recog_done
= 1;
969 switch (cdev
->private->state
) {
970 case DEV_STATE_NOT_OPER
:
971 cdev
->private->flags
.recog_done
= 1;
972 /* Remove device found not operational. */
973 if (!get_device(&cdev
->dev
))
975 sch
= to_subchannel(cdev
->dev
.parent
);
976 PREPARE_WORK(&cdev
->private->kick_work
,
977 ccw_device_call_sch_unregister
);
978 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
979 if (atomic_dec_and_test(&ccw_device_init_count
))
980 wake_up(&ccw_device_init_wq
);
982 case DEV_STATE_BOXED
:
983 /* Device did not respond in time. */
984 case DEV_STATE_OFFLINE
:
986 * We can't register the device in interrupt context so
987 * we schedule a work item.
989 if (!get_device(&cdev
->dev
))
991 PREPARE_WORK(&cdev
->private->kick_work
,
992 io_subchannel_register
);
993 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
999 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
1002 struct ccw_device_private
*priv
;
1004 sch
->dev
.driver_data
= cdev
;
1005 sch
->driver
= &io_subchannel_driver
;
1006 cdev
->ccwlock
= sch
->lock
;
1008 /* Init private data. */
1009 priv
= cdev
->private;
1010 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1011 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
1012 priv
->schid
= sch
->schid
;
1013 priv
->state
= DEV_STATE_NOT_OPER
;
1014 INIT_LIST_HEAD(&priv
->cmb_list
);
1015 init_waitqueue_head(&priv
->wait_q
);
1016 init_timer(&priv
->timer
);
1018 /* Set an initial name for the device. */
1019 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
1020 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1022 /* Increase counter of devices currently in recognition. */
1023 atomic_inc(&ccw_device_init_count
);
1025 /* Start async. device sensing. */
1026 spin_lock_irq(sch
->lock
);
1027 rc
= ccw_device_recognition(cdev
);
1028 spin_unlock_irq(sch
->lock
);
1030 if (atomic_dec_and_test(&ccw_device_init_count
))
1031 wake_up(&ccw_device_init_wq
);
1036 static void ccw_device_move_to_sch(struct work_struct
*work
)
1038 struct ccw_device_private
*priv
;
1040 struct subchannel
*sch
;
1041 struct ccw_device
*cdev
;
1042 struct subchannel
*former_parent
;
1044 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1047 former_parent
= ccw_device_is_orphan(cdev
) ?
1048 NULL
: to_subchannel(get_device(cdev
->dev
.parent
));
1049 mutex_lock(&sch
->reg_mutex
);
1050 /* Try to move the ccw device to its new subchannel. */
1051 rc
= device_move(&cdev
->dev
, &sch
->dev
);
1052 mutex_unlock(&sch
->reg_mutex
);
1054 CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
1055 "0.%x.%04x failed (ret=%d)!\n",
1056 cdev
->private->dev_id
.ssid
,
1057 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1058 sch
->schid
.sch_no
, rc
);
1059 css_sch_device_unregister(sch
);
1062 if (former_parent
) {
1063 spin_lock_irq(former_parent
->lock
);
1064 former_parent
->dev
.driver_data
= NULL
;
1065 spin_unlock_irq(former_parent
->lock
);
1066 css_sch_device_unregister(former_parent
);
1067 /* Reset intparm to zeroes. */
1068 former_parent
->schib
.pmcw
.intparm
= 0;
1069 cio_modify(former_parent
);
1071 sch_attach_device(sch
, cdev
);
1074 put_device(&former_parent
->dev
);
1075 put_device(&cdev
->dev
);
1079 io_subchannel_probe (struct subchannel
*sch
)
1081 struct ccw_device
*cdev
;
1083 unsigned long flags
;
1084 struct ccw_dev_id dev_id
;
1086 if (sch
->dev
.driver_data
) {
1088 * This subchannel already has an associated ccw_device.
1089 * Register it and exit. This happens for all early
1090 * device, e.g. the console.
1092 cdev
= sch
->dev
.driver_data
;
1093 device_initialize(&cdev
->dev
);
1094 ccw_device_register(cdev
);
1096 * Check if the device is already online. If it is
1097 * the reference count needs to be corrected
1098 * (see ccw_device_online and css_init_done for the
1101 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1102 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1103 cdev
->private->state
!= DEV_STATE_BOXED
)
1104 get_device(&cdev
->dev
);
1108 * First check if a fitting device may be found amongst the
1109 * disconnected devices or in the orphanage.
1111 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1112 dev_id
.ssid
= sch
->schid
.ssid
;
1113 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1115 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1119 * Schedule moving the device until when we have a registered
1120 * subchannel to move to and succeed the probe. We can
1121 * unregister later again, when the probe is through.
1123 cdev
->private->sch
= sch
;
1124 PREPARE_WORK(&cdev
->private->kick_work
,
1125 ccw_device_move_to_sch
);
1126 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1129 cdev
= io_subchannel_create_ccwdev(sch
);
1131 return PTR_ERR(cdev
);
1133 rc
= io_subchannel_recog(cdev
, sch
);
1135 spin_lock_irqsave(sch
->lock
, flags
);
1136 sch
->dev
.driver_data
= NULL
;
1137 spin_unlock_irqrestore(sch
->lock
, flags
);
1138 if (cdev
->dev
.release
)
1139 cdev
->dev
.release(&cdev
->dev
);
1146 io_subchannel_remove (struct subchannel
*sch
)
1148 struct ccw_device
*cdev
;
1149 unsigned long flags
;
1151 if (!sch
->dev
.driver_data
)
1153 cdev
= sch
->dev
.driver_data
;
1154 /* Set ccw device to not operational and drop reference. */
1155 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1156 sch
->dev
.driver_data
= NULL
;
1157 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1158 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1159 ccw_device_unregister(cdev
);
1160 put_device(&cdev
->dev
);
1165 io_subchannel_notify(struct device
*dev
, int event
)
1167 struct ccw_device
*cdev
;
1169 cdev
= dev
->driver_data
;
1176 return cdev
->drv
->notify
? cdev
->drv
->notify(cdev
, event
) : 0;
1180 io_subchannel_verify(struct device
*dev
)
1182 struct ccw_device
*cdev
;
1184 cdev
= dev
->driver_data
;
1186 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1190 io_subchannel_ioterm(struct device
*dev
)
1192 struct ccw_device
*cdev
;
1194 cdev
= dev
->driver_data
;
1197 /* Internal I/O will be retried by the interrupt handler. */
1198 if (cdev
->private->flags
.intretry
)
1200 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1202 cdev
->handler(cdev
, cdev
->private->intparm
,
1207 io_subchannel_shutdown(struct subchannel
*sch
)
1209 struct ccw_device
*cdev
;
1212 cdev
= sch
->dev
.driver_data
;
1214 if (cio_is_console(sch
->schid
))
1216 if (!sch
->schib
.pmcw
.ena
)
1217 /* Nothing to do. */
1219 ret
= cio_disable_subchannel(sch
);
1221 /* Subchannel is disabled, we're done. */
1223 cdev
->private->state
= DEV_STATE_QUIESCE
;
1225 cdev
->handler(cdev
, cdev
->private->intparm
,
1227 ret
= ccw_device_cancel_halt_clear(cdev
);
1228 if (ret
== -EBUSY
) {
1229 ccw_device_set_timeout(cdev
, HZ
/10);
1230 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1232 cio_disable_subchannel(sch
);
1235 #ifdef CONFIG_CCW_CONSOLE
1236 static struct ccw_device console_cdev
;
1237 static struct ccw_device_private console_private
;
1238 static int console_cdev_in_use
;
1240 static DEFINE_SPINLOCK(ccw_console_lock
);
1242 spinlock_t
* cio_get_console_lock(void)
1244 return &ccw_console_lock
;
1248 ccw_device_console_enable (struct ccw_device
*cdev
, struct subchannel
*sch
)
1252 /* Initialize the ccw_device structure. */
1253 cdev
->dev
.parent
= &sch
->dev
;
1254 rc
= io_subchannel_recog(cdev
, sch
);
1258 /* Now wait for the async. recognition to come to an end. */
1259 spin_lock_irq(cdev
->ccwlock
);
1260 while (!dev_fsm_final_state(cdev
))
1263 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1265 ccw_device_online(cdev
);
1266 while (!dev_fsm_final_state(cdev
))
1268 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1272 spin_unlock_irq(cdev
->ccwlock
);
1277 ccw_device_probe_console(void)
1279 struct subchannel
*sch
;
1282 if (xchg(&console_cdev_in_use
, 1) != 0)
1283 return ERR_PTR(-EBUSY
);
1284 sch
= cio_probe_console();
1286 console_cdev_in_use
= 0;
1287 return (void *) sch
;
1289 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1290 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1291 console_cdev
.private = &console_private
;
1292 console_private
.cdev
= &console_cdev
;
1293 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1295 cio_release_console();
1296 console_cdev_in_use
= 0;
1297 return ERR_PTR(ret
);
1299 console_cdev
.online
= 1;
1300 return &console_cdev
;
1305 * get ccw_device matching the busid, but only if owned by cdrv
1308 __ccwdev_check_busid(struct device
*dev
, void *id
)
1314 return (strncmp(bus_id
, dev
->bus_id
, BUS_ID_SIZE
) == 0);
1319 get_ccwdev_by_busid(struct ccw_driver
*cdrv
, const char *bus_id
)
1322 struct device_driver
*drv
;
1324 drv
= get_driver(&cdrv
->driver
);
1328 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1329 __ccwdev_check_busid
);
1332 return dev
? to_ccwdev(dev
) : NULL
;
1335 /************************** device driver handling ************************/
1337 /* This is the implementation of the ccw_driver class. The probe, remove
1338 * and release methods are initially very similar to the device_driver
1339 * implementations, with the difference that they have ccw_device
1342 * A ccw driver also contains the information that is needed for
1346 ccw_device_probe (struct device
*dev
)
1348 struct ccw_device
*cdev
= to_ccwdev(dev
);
1349 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1352 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1354 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1365 ccw_device_remove (struct device
*dev
)
1367 struct ccw_device
*cdev
= to_ccwdev(dev
);
1368 struct ccw_driver
*cdrv
= cdev
->drv
;
1375 spin_lock_irq(cdev
->ccwlock
);
1376 ret
= ccw_device_offline(cdev
);
1377 spin_unlock_irq(cdev
->ccwlock
);
1379 wait_event(cdev
->private->wait_q
,
1380 dev_fsm_final_state(cdev
));
1382 //FIXME: we can't fail!
1383 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
1384 "device 0.%x.%04x\n",
1385 ret
, cdev
->private->dev_id
.ssid
,
1386 cdev
->private->dev_id
.devno
);
1388 ccw_device_set_timeout(cdev
, 0);
1393 struct bus_type ccw_bus_type
= {
1395 .match
= ccw_bus_match
,
1396 .uevent
= ccw_uevent
,
1397 .probe
= ccw_device_probe
,
1398 .remove
= ccw_device_remove
,
1402 ccw_driver_register (struct ccw_driver
*cdriver
)
1404 struct device_driver
*drv
= &cdriver
->driver
;
1406 drv
->bus
= &ccw_bus_type
;
1407 drv
->name
= cdriver
->name
;
1409 return driver_register(drv
);
1413 ccw_driver_unregister (struct ccw_driver
*cdriver
)
1415 driver_unregister(&cdriver
->driver
);
1418 /* Helper func for qdio. */
1419 struct subchannel_id
1420 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1422 struct subchannel
*sch
;
1424 sch
= to_subchannel(cdev
->dev
.parent
);
1428 MODULE_LICENSE("GPL");
1429 EXPORT_SYMBOL(ccw_device_set_online
);
1430 EXPORT_SYMBOL(ccw_device_set_offline
);
1431 EXPORT_SYMBOL(ccw_driver_register
);
1432 EXPORT_SYMBOL(ccw_driver_unregister
);
1433 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1434 EXPORT_SYMBOL(ccw_bus_type
);
1435 EXPORT_SYMBOL(ccw_device_work
);
1436 EXPORT_SYMBOL(ccw_device_notify_work
);
1437 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);