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
, char **envp
, int num_envp
,
82 char *buffer
, int buffer_size
)
84 struct ccw_device
*cdev
= to_ccwdev(dev
);
85 struct ccw_device_id
*id
= &(cdev
->id
);
89 char modalias_buf
[30];
92 ret
= add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
, &len
,
93 "CU_TYPE=%04X", id
->cu_type
);
98 ret
= add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
, &len
,
99 "CU_MODEL=%02X", id
->cu_model
);
103 /* The next two can be zero, that's ok for us */
105 ret
= add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
, &len
,
106 "DEV_TYPE=%04X", id
->dev_type
);
111 ret
= add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
, &len
,
112 "DEV_MODEL=%02X", id
->dev_model
);
117 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
118 ret
= add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
, &len
,
119 "MODALIAS=%s", modalias_buf
);
126 struct bus_type ccw_bus_type
;
128 static int io_subchannel_probe (struct subchannel
*);
129 static int io_subchannel_remove (struct subchannel
*);
130 static int io_subchannel_notify(struct device
*, int);
131 static void io_subchannel_verify(struct device
*);
132 static void io_subchannel_ioterm(struct device
*);
133 static void io_subchannel_shutdown(struct subchannel
*);
135 static struct css_driver io_subchannel_driver
= {
136 .subchannel_type
= SUBCHANNEL_TYPE_IO
,
138 .name
= "io_subchannel",
139 .bus
= &css_bus_type
,
141 .irq
= io_subchannel_irq
,
142 .notify
= io_subchannel_notify
,
143 .verify
= io_subchannel_verify
,
144 .termination
= io_subchannel_ioterm
,
145 .probe
= io_subchannel_probe
,
146 .remove
= io_subchannel_remove
,
147 .shutdown
= io_subchannel_shutdown
,
150 struct workqueue_struct
*ccw_device_work
;
151 struct workqueue_struct
*ccw_device_notify_work
;
152 wait_queue_head_t ccw_device_init_wq
;
153 atomic_t ccw_device_init_count
;
156 init_ccw_bus_type (void)
160 init_waitqueue_head(&ccw_device_init_wq
);
161 atomic_set(&ccw_device_init_count
, 0);
163 ccw_device_work
= create_singlethread_workqueue("cio");
164 if (!ccw_device_work
)
165 return -ENOMEM
; /* FIXME: better errno ? */
166 ccw_device_notify_work
= create_singlethread_workqueue("cio_notify");
167 if (!ccw_device_notify_work
) {
168 ret
= -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 if ((ret
= driver_register(&io_subchannel_driver
.drv
)))
182 wait_event(ccw_device_init_wq
,
183 atomic_read(&ccw_device_init_count
) == 0);
184 flush_workqueue(ccw_device_work
);
188 destroy_workqueue(ccw_device_work
);
189 if (ccw_device_notify_work
)
190 destroy_workqueue(ccw_device_notify_work
);
192 destroy_workqueue(slow_path_wq
);
197 cleanup_ccw_bus_type (void)
199 driver_unregister(&io_subchannel_driver
.drv
);
200 bus_unregister(&ccw_bus_type
);
201 destroy_workqueue(ccw_device_notify_work
);
202 destroy_workqueue(ccw_device_work
);
205 subsys_initcall(init_ccw_bus_type
);
206 module_exit(cleanup_ccw_bus_type
);
208 /************************ device handling **************************/
211 * A ccw_device has some interfaces in sysfs in addition to the
213 * The following entries are designed to export the information which
214 * resided in 2.4 in /proc/subchannels. Subchannel and device number
215 * are obvious, so they don't have an entry :)
216 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
219 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
221 struct subchannel
*sch
= to_subchannel(dev
);
222 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
227 for (chp
= 0; chp
< 8; chp
++) {
229 if (ssd
->path_mask
& mask
)
230 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
232 ret
+= sprintf(buf
+ ret
, "00 ");
234 ret
+= sprintf (buf
+ret
, "\n");
235 return min((ssize_t
)PAGE_SIZE
, ret
);
239 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
241 struct subchannel
*sch
= to_subchannel(dev
);
242 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
244 return sprintf (buf
, "%02x %02x %02x\n",
245 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
249 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
251 struct ccw_device
*cdev
= to_ccwdev(dev
);
252 struct ccw_device_id
*id
= &(cdev
->id
);
254 if (id
->dev_type
!= 0)
255 return sprintf(buf
, "%04x/%02x\n",
256 id
->dev_type
, id
->dev_model
);
258 return sprintf(buf
, "n/a\n");
262 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
264 struct ccw_device
*cdev
= to_ccwdev(dev
);
265 struct ccw_device_id
*id
= &(cdev
->id
);
267 return sprintf(buf
, "%04x/%02x\n",
268 id
->cu_type
, id
->cu_model
);
272 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
274 struct ccw_device
*cdev
= to_ccwdev(dev
);
275 struct ccw_device_id
*id
= &(cdev
->id
);
278 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
280 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
284 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
286 struct ccw_device
*cdev
= to_ccwdev(dev
);
288 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
291 int ccw_device_is_orphan(struct ccw_device
*cdev
)
293 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
296 static void ccw_device_unregister(struct ccw_device
*cdev
)
298 if (test_and_clear_bit(1, &cdev
->private->registered
))
299 device_del(&cdev
->dev
);
302 static void ccw_device_remove_orphan_cb(struct device
*dev
)
304 struct ccw_device
*cdev
= to_ccwdev(dev
);
306 ccw_device_unregister(cdev
);
307 put_device(&cdev
->dev
);
310 static void ccw_device_remove_sch_cb(struct device
*dev
)
312 struct subchannel
*sch
;
314 sch
= to_subchannel(dev
);
315 css_sch_device_unregister(sch
);
316 /* Reset intparm to zeroes. */
317 sch
->schib
.pmcw
.intparm
= 0;
319 put_device(&sch
->dev
);
323 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
329 * Forced offline in disconnected state means
330 * 'throw away device'.
332 if (ccw_device_is_orphan(cdev
)) {
334 * Deregister ccw device.
335 * Unfortunately, we cannot do this directly from the
338 spin_lock_irqsave(cdev
->ccwlock
, flags
);
339 cdev
->private->state
= DEV_STATE_NOT_OPER
;
340 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
341 rc
= device_schedule_callback(&cdev
->dev
,
342 ccw_device_remove_orphan_cb
);
344 CIO_MSG_EVENT(2, "Couldn't unregister orphan "
346 cdev
->private->dev_id
.ssid
,
347 cdev
->private->dev_id
.devno
);
350 /* Deregister subchannel, which will kill the ccw device. */
351 rc
= device_schedule_callback(cdev
->dev
.parent
,
352 ccw_device_remove_sch_cb
);
354 CIO_MSG_EVENT(2, "Couldn't unregister disconnected device "
356 cdev
->private->dev_id
.ssid
,
357 cdev
->private->dev_id
.devno
);
361 ccw_device_set_offline(struct ccw_device
*cdev
)
367 if (!cdev
->online
|| !cdev
->drv
)
370 if (cdev
->drv
->set_offline
) {
371 ret
= cdev
->drv
->set_offline(cdev
);
376 spin_lock_irq(cdev
->ccwlock
);
377 ret
= ccw_device_offline(cdev
);
378 if (ret
== -ENODEV
) {
379 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
380 cdev
->private->state
= DEV_STATE_OFFLINE
;
381 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
383 spin_unlock_irq(cdev
->ccwlock
);
386 spin_unlock_irq(cdev
->ccwlock
);
388 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
390 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
391 "device 0.%x.%04x\n",
392 ret
, cdev
->private->dev_id
.ssid
,
393 cdev
->private->dev_id
.devno
);
400 ccw_device_set_online(struct ccw_device
*cdev
)
406 if (cdev
->online
|| !cdev
->drv
)
409 spin_lock_irq(cdev
->ccwlock
);
410 ret
= ccw_device_online(cdev
);
411 spin_unlock_irq(cdev
->ccwlock
);
413 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
415 CIO_MSG_EVENT(2, "ccw_device_online returned %d, "
416 "device 0.%x.%04x\n",
417 ret
, cdev
->private->dev_id
.ssid
,
418 cdev
->private->dev_id
.devno
);
421 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
423 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
427 spin_lock_irq(cdev
->ccwlock
);
428 ret
= ccw_device_offline(cdev
);
429 spin_unlock_irq(cdev
->ccwlock
);
431 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
433 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
434 "device 0.%x.%04x\n",
435 ret
, cdev
->private->dev_id
.ssid
,
436 cdev
->private->dev_id
.devno
);
437 return (ret
== 0) ? -ENODEV
: ret
;
440 static void online_store_handle_offline(struct ccw_device
*cdev
)
442 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
443 ccw_device_remove_disconnected(cdev
);
444 else if (cdev
->drv
&& cdev
->drv
->set_offline
)
445 ccw_device_set_offline(cdev
);
448 static int online_store_recog_and_online(struct ccw_device
*cdev
)
452 /* Do device recognition, if needed. */
453 if (cdev
->id
.cu_type
== 0) {
454 ret
= ccw_device_recognition(cdev
);
456 CIO_MSG_EVENT(0, "Couldn't start recognition "
457 "for device 0.%x.%04x (ret=%d)\n",
458 cdev
->private->dev_id
.ssid
,
459 cdev
->private->dev_id
.devno
, ret
);
462 wait_event(cdev
->private->wait_q
,
463 cdev
->private->flags
.recog_done
);
465 if (cdev
->drv
&& cdev
->drv
->set_online
)
466 ccw_device_set_online(cdev
);
469 static void online_store_handle_online(struct ccw_device
*cdev
, int force
)
473 ret
= online_store_recog_and_online(cdev
);
476 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
477 ret
= ccw_device_stlck(cdev
);
480 "ccw_device_stlck returned %d!\n", ret
);
483 if (cdev
->id
.cu_type
== 0)
484 cdev
->private->state
= DEV_STATE_NOT_OPER
;
485 online_store_recog_and_online(cdev
);
490 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
491 const char *buf
, size_t count
)
493 struct ccw_device
*cdev
= to_ccwdev(dev
);
497 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
500 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
501 atomic_set(&cdev
->private->onoff
, 0);
504 if (!strncmp(buf
, "force\n", count
)) {
509 i
= simple_strtoul(buf
, &tmp
, 16);
514 online_store_handle_offline(cdev
);
517 online_store_handle_online(cdev
, force
);
523 module_put(cdev
->drv
->owner
);
524 atomic_set(&cdev
->private->onoff
, 0);
529 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
531 struct ccw_device
*cdev
= to_ccwdev(dev
);
532 struct subchannel
*sch
;
534 if (ccw_device_is_orphan(cdev
))
535 return sprintf(buf
, "no device\n");
536 switch (cdev
->private->state
) {
537 case DEV_STATE_BOXED
:
538 return sprintf(buf
, "boxed\n");
539 case DEV_STATE_DISCONNECTED
:
540 case DEV_STATE_DISCONNECTED_SENSE_ID
:
541 case DEV_STATE_NOT_OPER
:
542 sch
= to_subchannel(dev
->parent
);
544 return sprintf(buf
, "no path\n");
546 return sprintf(buf
, "no device\n");
548 /* All other states considered fine. */
549 return sprintf(buf
, "good\n");
553 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
554 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
555 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
556 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
557 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
558 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
559 extern struct device_attribute dev_attr_cmb_enable
;
560 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
562 static struct attribute
* subch_attrs
[] = {
563 &dev_attr_chpids
.attr
,
564 &dev_attr_pimpampom
.attr
,
568 static struct attribute_group subch_attr_group
= {
569 .attrs
= subch_attrs
,
572 struct attribute_group
*subch_attr_groups
[] = {
577 static struct attribute
* ccwdev_attrs
[] = {
578 &dev_attr_devtype
.attr
,
579 &dev_attr_cutype
.attr
,
580 &dev_attr_modalias
.attr
,
581 &dev_attr_online
.attr
,
582 &dev_attr_cmb_enable
.attr
,
583 &dev_attr_availability
.attr
,
587 static struct attribute_group ccwdev_attr_group
= {
588 .attrs
= ccwdev_attrs
,
591 static struct attribute_group
*ccwdev_attr_groups
[] = {
596 /* this is a simple abstraction for device_register that sets the
597 * correct bus type and adds the bus specific files */
598 static int ccw_device_register(struct ccw_device
*cdev
)
600 struct device
*dev
= &cdev
->dev
;
603 dev
->bus
= &ccw_bus_type
;
605 if ((ret
= device_add(dev
)))
608 set_bit(1, &cdev
->private->registered
);
613 struct ccw_dev_id dev_id
;
614 struct ccw_device
* sibling
;
618 match_devno(struct device
* dev
, void * data
)
620 struct match_data
* d
= data
;
621 struct ccw_device
* cdev
;
623 cdev
= to_ccwdev(dev
);
624 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
625 !ccw_device_is_orphan(cdev
) &&
626 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
627 (cdev
!= d
->sibling
))
632 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
633 struct ccw_device
*sibling
)
636 struct match_data data
;
638 data
.dev_id
= *dev_id
;
639 data
.sibling
= sibling
;
640 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
642 return dev
? to_ccwdev(dev
) : NULL
;
645 static int match_orphan(struct device
*dev
, void *data
)
647 struct ccw_dev_id
*dev_id
;
648 struct ccw_device
*cdev
;
651 cdev
= to_ccwdev(dev
);
652 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
655 static struct ccw_device
*
656 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
657 struct ccw_dev_id
*dev_id
)
661 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
664 return dev
? to_ccwdev(dev
) : NULL
;
668 ccw_device_add_changed(struct work_struct
*work
)
670 struct ccw_device_private
*priv
;
671 struct ccw_device
*cdev
;
673 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
675 if (device_add(&cdev
->dev
)) {
676 put_device(&cdev
->dev
);
679 set_bit(1, &cdev
->private->registered
);
682 void ccw_device_do_unreg_rereg(struct work_struct
*work
)
684 struct ccw_device_private
*priv
;
685 struct ccw_device
*cdev
;
686 struct subchannel
*sch
;
688 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
690 sch
= to_subchannel(cdev
->dev
.parent
);
692 ccw_device_unregister(cdev
);
693 PREPARE_WORK(&cdev
->private->kick_work
,
694 ccw_device_add_changed
);
695 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
699 ccw_device_release(struct device
*dev
)
701 struct ccw_device
*cdev
;
703 cdev
= to_ccwdev(dev
);
704 kfree(cdev
->private);
708 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
710 struct ccw_device
*cdev
;
712 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
714 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
715 GFP_KERNEL
| GFP_DMA
);
720 return ERR_PTR(-ENOMEM
);
723 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
724 struct ccw_device
*cdev
)
726 cdev
->private->cdev
= cdev
;
727 atomic_set(&cdev
->private->onoff
, 0);
728 cdev
->dev
.parent
= &sch
->dev
;
729 cdev
->dev
.release
= ccw_device_release
;
730 INIT_LIST_HEAD(&cdev
->private->kick_work
.entry
);
731 cdev
->dev
.groups
= ccwdev_attr_groups
;
732 /* Do first half of device_register. */
733 device_initialize(&cdev
->dev
);
734 if (!get_device(&sch
->dev
)) {
735 if (cdev
->dev
.release
)
736 cdev
->dev
.release(&cdev
->dev
);
742 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
744 struct ccw_device
*cdev
;
747 cdev
= io_subchannel_allocate_dev(sch
);
749 ret
= io_subchannel_initialize_dev(sch
, cdev
);
758 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
760 static void sch_attach_device(struct subchannel
*sch
,
761 struct ccw_device
*cdev
)
763 css_update_ssd_info(sch
);
764 spin_lock_irq(sch
->lock
);
765 sch
->dev
.driver_data
= cdev
;
766 cdev
->private->schid
= sch
->schid
;
767 cdev
->ccwlock
= sch
->lock
;
768 device_trigger_reprobe(sch
);
769 spin_unlock_irq(sch
->lock
);
772 static void sch_attach_disconnected_device(struct subchannel
*sch
,
773 struct ccw_device
*cdev
)
775 struct subchannel
*other_sch
;
778 other_sch
= to_subchannel(get_device(cdev
->dev
.parent
));
779 ret
= device_move(&cdev
->dev
, &sch
->dev
);
781 CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
782 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
783 cdev
->private->dev_id
.devno
, ret
);
784 put_device(&other_sch
->dev
);
787 other_sch
->dev
.driver_data
= NULL
;
788 /* No need to keep a subchannel without ccw device around. */
789 css_sch_device_unregister(other_sch
);
790 put_device(&other_sch
->dev
);
791 sch_attach_device(sch
, cdev
);
794 static void sch_attach_orphaned_device(struct subchannel
*sch
,
795 struct ccw_device
*cdev
)
799 /* Try to move the ccw device to its new subchannel. */
800 ret
= device_move(&cdev
->dev
, &sch
->dev
);
802 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
803 "failed (ret=%d)!\n",
804 cdev
->private->dev_id
.ssid
,
805 cdev
->private->dev_id
.devno
, ret
);
808 sch_attach_device(sch
, cdev
);
811 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
813 struct ccw_device
*cdev
;
815 /* Need to allocate a new ccw device. */
816 cdev
= io_subchannel_create_ccwdev(sch
);
818 /* OK, we did everything we could... */
819 css_sch_device_unregister(sch
);
822 spin_lock_irq(sch
->lock
);
823 sch
->dev
.driver_data
= cdev
;
824 spin_unlock_irq(sch
->lock
);
825 /* Start recognition for the new ccw device. */
826 if (io_subchannel_recog(cdev
, sch
)) {
827 spin_lock_irq(sch
->lock
);
828 sch
->dev
.driver_data
= NULL
;
829 spin_unlock_irq(sch
->lock
);
830 if (cdev
->dev
.release
)
831 cdev
->dev
.release(&cdev
->dev
);
832 css_sch_device_unregister(sch
);
837 void ccw_device_move_to_orphanage(struct work_struct
*work
)
839 struct ccw_device_private
*priv
;
840 struct ccw_device
*cdev
;
841 struct ccw_device
*replacing_cdev
;
842 struct subchannel
*sch
;
844 struct channel_subsystem
*css
;
845 struct ccw_dev_id dev_id
;
847 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
849 sch
= to_subchannel(cdev
->dev
.parent
);
850 css
= to_css(sch
->dev
.parent
);
851 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
852 dev_id
.ssid
= sch
->schid
.ssid
;
855 * Move the orphaned ccw device to the orphanage so the replacing
856 * ccw device can take its place on the subchannel.
858 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
);
860 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
861 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
862 cdev
->private->dev_id
.devno
, ret
);
865 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
867 * Search for the replacing ccw device
868 * - among the disconnected devices
871 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
872 if (replacing_cdev
) {
873 sch_attach_disconnected_device(sch
, replacing_cdev
);
876 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
877 if (replacing_cdev
) {
878 sch_attach_orphaned_device(sch
, replacing_cdev
);
881 sch_create_and_recog_new_device(sch
);
885 * Register recognized device.
888 io_subchannel_register(struct work_struct
*work
)
890 struct ccw_device_private
*priv
;
891 struct ccw_device
*cdev
;
892 struct subchannel
*sch
;
896 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
898 sch
= to_subchannel(cdev
->dev
.parent
);
899 css_update_ssd_info(sch
);
901 * io_subchannel_register() will also be called after device
902 * recognition has been done for a boxed device (which will already
903 * be registered). We need to reprobe since we may now have sense id
906 if (klist_node_attached(&cdev
->dev
.knode_parent
)) {
908 ret
= device_reprobe(&cdev
->dev
);
910 /* We can't do much here. */
911 CIO_MSG_EVENT(2, "device_reprobe() returned"
912 " %d for 0.%x.%04x\n", ret
,
913 cdev
->private->dev_id
.ssid
,
914 cdev
->private->dev_id
.devno
);
919 * Now we know this subchannel will stay, we can throw
920 * our delayed uevent.
922 sch
->dev
.uevent_suppress
= 0;
923 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
924 /* make it known to the system */
925 ret
= ccw_device_register(cdev
);
927 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
928 cdev
->private->dev_id
.ssid
,
929 cdev
->private->dev_id
.devno
, ret
);
930 put_device(&cdev
->dev
);
931 spin_lock_irqsave(sch
->lock
, flags
);
932 sch
->dev
.driver_data
= NULL
;
933 spin_unlock_irqrestore(sch
->lock
, flags
);
934 kfree (cdev
->private);
936 put_device(&sch
->dev
);
937 if (atomic_dec_and_test(&ccw_device_init_count
))
938 wake_up(&ccw_device_init_wq
);
941 put_device(&cdev
->dev
);
943 cdev
->private->flags
.recog_done
= 1;
944 put_device(&sch
->dev
);
945 wake_up(&cdev
->private->wait_q
);
946 if (atomic_dec_and_test(&ccw_device_init_count
))
947 wake_up(&ccw_device_init_wq
);
951 ccw_device_call_sch_unregister(struct work_struct
*work
)
953 struct ccw_device_private
*priv
;
954 struct ccw_device
*cdev
;
955 struct subchannel
*sch
;
957 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
959 sch
= to_subchannel(cdev
->dev
.parent
);
960 css_sch_device_unregister(sch
);
961 /* Reset intparm to zeroes. */
962 sch
->schib
.pmcw
.intparm
= 0;
964 put_device(&cdev
->dev
);
965 put_device(&sch
->dev
);
969 * subchannel recognition done. Called from the state machine.
972 io_subchannel_recog_done(struct ccw_device
*cdev
)
974 struct subchannel
*sch
;
976 if (css_init_done
== 0) {
977 cdev
->private->flags
.recog_done
= 1;
980 switch (cdev
->private->state
) {
981 case DEV_STATE_NOT_OPER
:
982 cdev
->private->flags
.recog_done
= 1;
983 /* Remove device found not operational. */
984 if (!get_device(&cdev
->dev
))
986 sch
= to_subchannel(cdev
->dev
.parent
);
987 PREPARE_WORK(&cdev
->private->kick_work
,
988 ccw_device_call_sch_unregister
);
989 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
990 if (atomic_dec_and_test(&ccw_device_init_count
))
991 wake_up(&ccw_device_init_wq
);
993 case DEV_STATE_BOXED
:
994 /* Device did not respond in time. */
995 case DEV_STATE_OFFLINE
:
997 * We can't register the device in interrupt context so
998 * we schedule a work item.
1000 if (!get_device(&cdev
->dev
))
1002 PREPARE_WORK(&cdev
->private->kick_work
,
1003 io_subchannel_register
);
1004 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1010 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
1013 struct ccw_device_private
*priv
;
1015 sch
->dev
.driver_data
= cdev
;
1016 sch
->driver
= &io_subchannel_driver
;
1017 cdev
->ccwlock
= sch
->lock
;
1019 /* Init private data. */
1020 priv
= cdev
->private;
1021 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1022 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
1023 priv
->schid
= sch
->schid
;
1024 priv
->state
= DEV_STATE_NOT_OPER
;
1025 INIT_LIST_HEAD(&priv
->cmb_list
);
1026 init_waitqueue_head(&priv
->wait_q
);
1027 init_timer(&priv
->timer
);
1029 /* Set an initial name for the device. */
1030 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
1031 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1033 /* Increase counter of devices currently in recognition. */
1034 atomic_inc(&ccw_device_init_count
);
1036 /* Start async. device sensing. */
1037 spin_lock_irq(sch
->lock
);
1038 rc
= ccw_device_recognition(cdev
);
1039 spin_unlock_irq(sch
->lock
);
1041 if (atomic_dec_and_test(&ccw_device_init_count
))
1042 wake_up(&ccw_device_init_wq
);
1047 static void ccw_device_move_to_sch(struct work_struct
*work
)
1049 struct ccw_device_private
*priv
;
1051 struct subchannel
*sch
;
1052 struct ccw_device
*cdev
;
1053 struct subchannel
*former_parent
;
1055 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1058 former_parent
= ccw_device_is_orphan(cdev
) ?
1059 NULL
: to_subchannel(get_device(cdev
->dev
.parent
));
1060 mutex_lock(&sch
->reg_mutex
);
1061 /* Try to move the ccw device to its new subchannel. */
1062 rc
= device_move(&cdev
->dev
, &sch
->dev
);
1063 mutex_unlock(&sch
->reg_mutex
);
1065 CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
1066 "0.%x.%04x failed (ret=%d)!\n",
1067 cdev
->private->dev_id
.ssid
,
1068 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1069 sch
->schid
.sch_no
, rc
);
1070 css_sch_device_unregister(sch
);
1073 if (former_parent
) {
1074 spin_lock_irq(former_parent
->lock
);
1075 former_parent
->dev
.driver_data
= NULL
;
1076 spin_unlock_irq(former_parent
->lock
);
1077 css_sch_device_unregister(former_parent
);
1078 /* Reset intparm to zeroes. */
1079 former_parent
->schib
.pmcw
.intparm
= 0;
1080 cio_modify(former_parent
);
1082 sch_attach_device(sch
, cdev
);
1085 put_device(&former_parent
->dev
);
1086 put_device(&cdev
->dev
);
1090 io_subchannel_probe (struct subchannel
*sch
)
1092 struct ccw_device
*cdev
;
1094 unsigned long flags
;
1095 struct ccw_dev_id dev_id
;
1097 if (sch
->dev
.driver_data
) {
1099 * This subchannel already has an associated ccw_device.
1100 * Register it and exit. This happens for all early
1101 * device, e.g. the console.
1103 cdev
= sch
->dev
.driver_data
;
1104 device_initialize(&cdev
->dev
);
1105 ccw_device_register(cdev
);
1107 * Check if the device is already online. If it is
1108 * the reference count needs to be corrected
1109 * (see ccw_device_online and css_init_done for the
1112 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1113 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1114 cdev
->private->state
!= DEV_STATE_BOXED
)
1115 get_device(&cdev
->dev
);
1119 * First check if a fitting device may be found amongst the
1120 * disconnected devices or in the orphanage.
1122 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1123 dev_id
.ssid
= sch
->schid
.ssid
;
1124 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1126 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1130 * Schedule moving the device until when we have a registered
1131 * subchannel to move to and succeed the probe. We can
1132 * unregister later again, when the probe is through.
1134 cdev
->private->sch
= sch
;
1135 PREPARE_WORK(&cdev
->private->kick_work
,
1136 ccw_device_move_to_sch
);
1137 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1140 cdev
= io_subchannel_create_ccwdev(sch
);
1142 return PTR_ERR(cdev
);
1144 rc
= io_subchannel_recog(cdev
, sch
);
1146 spin_lock_irqsave(sch
->lock
, flags
);
1147 sch
->dev
.driver_data
= NULL
;
1148 spin_unlock_irqrestore(sch
->lock
, flags
);
1149 if (cdev
->dev
.release
)
1150 cdev
->dev
.release(&cdev
->dev
);
1157 io_subchannel_remove (struct subchannel
*sch
)
1159 struct ccw_device
*cdev
;
1160 unsigned long flags
;
1162 if (!sch
->dev
.driver_data
)
1164 cdev
= sch
->dev
.driver_data
;
1165 /* Set ccw device to not operational and drop reference. */
1166 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1167 sch
->dev
.driver_data
= NULL
;
1168 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1169 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1170 ccw_device_unregister(cdev
);
1171 put_device(&cdev
->dev
);
1176 io_subchannel_notify(struct device
*dev
, int event
)
1178 struct ccw_device
*cdev
;
1180 cdev
= dev
->driver_data
;
1187 return cdev
->drv
->notify
? cdev
->drv
->notify(cdev
, event
) : 0;
1191 io_subchannel_verify(struct device
*dev
)
1193 struct ccw_device
*cdev
;
1195 cdev
= dev
->driver_data
;
1197 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1201 io_subchannel_ioterm(struct device
*dev
)
1203 struct ccw_device
*cdev
;
1205 cdev
= dev
->driver_data
;
1208 /* Internal I/O will be retried by the interrupt handler. */
1209 if (cdev
->private->flags
.intretry
)
1211 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1213 cdev
->handler(cdev
, cdev
->private->intparm
,
1218 io_subchannel_shutdown(struct subchannel
*sch
)
1220 struct ccw_device
*cdev
;
1223 cdev
= sch
->dev
.driver_data
;
1225 if (cio_is_console(sch
->schid
))
1227 if (!sch
->schib
.pmcw
.ena
)
1228 /* Nothing to do. */
1230 ret
= cio_disable_subchannel(sch
);
1232 /* Subchannel is disabled, we're done. */
1234 cdev
->private->state
= DEV_STATE_QUIESCE
;
1236 cdev
->handler(cdev
, cdev
->private->intparm
,
1238 ret
= ccw_device_cancel_halt_clear(cdev
);
1239 if (ret
== -EBUSY
) {
1240 ccw_device_set_timeout(cdev
, HZ
/10);
1241 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1243 cio_disable_subchannel(sch
);
1246 #ifdef CONFIG_CCW_CONSOLE
1247 static struct ccw_device console_cdev
;
1248 static struct ccw_device_private console_private
;
1249 static int console_cdev_in_use
;
1251 static DEFINE_SPINLOCK(ccw_console_lock
);
1253 spinlock_t
* cio_get_console_lock(void)
1255 return &ccw_console_lock
;
1259 ccw_device_console_enable (struct ccw_device
*cdev
, struct subchannel
*sch
)
1263 /* Initialize the ccw_device structure. */
1264 cdev
->dev
.parent
= &sch
->dev
;
1265 rc
= io_subchannel_recog(cdev
, sch
);
1269 /* Now wait for the async. recognition to come to an end. */
1270 spin_lock_irq(cdev
->ccwlock
);
1271 while (!dev_fsm_final_state(cdev
))
1274 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1276 ccw_device_online(cdev
);
1277 while (!dev_fsm_final_state(cdev
))
1279 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1283 spin_unlock_irq(cdev
->ccwlock
);
1288 ccw_device_probe_console(void)
1290 struct subchannel
*sch
;
1293 if (xchg(&console_cdev_in_use
, 1) != 0)
1294 return ERR_PTR(-EBUSY
);
1295 sch
= cio_probe_console();
1297 console_cdev_in_use
= 0;
1298 return (void *) sch
;
1300 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1301 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1302 console_cdev
.private = &console_private
;
1303 console_private
.cdev
= &console_cdev
;
1304 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1306 cio_release_console();
1307 console_cdev_in_use
= 0;
1308 return ERR_PTR(ret
);
1310 console_cdev
.online
= 1;
1311 return &console_cdev
;
1316 * get ccw_device matching the busid, but only if owned by cdrv
1319 __ccwdev_check_busid(struct device
*dev
, void *id
)
1325 return (strncmp(bus_id
, dev
->bus_id
, BUS_ID_SIZE
) == 0);
1330 get_ccwdev_by_busid(struct ccw_driver
*cdrv
, const char *bus_id
)
1333 struct device_driver
*drv
;
1335 drv
= get_driver(&cdrv
->driver
);
1339 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1340 __ccwdev_check_busid
);
1343 return dev
? to_ccwdev(dev
) : NULL
;
1346 /************************** device driver handling ************************/
1348 /* This is the implementation of the ccw_driver class. The probe, remove
1349 * and release methods are initially very similar to the device_driver
1350 * implementations, with the difference that they have ccw_device
1353 * A ccw driver also contains the information that is needed for
1357 ccw_device_probe (struct device
*dev
)
1359 struct ccw_device
*cdev
= to_ccwdev(dev
);
1360 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1363 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1365 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1376 ccw_device_remove (struct device
*dev
)
1378 struct ccw_device
*cdev
= to_ccwdev(dev
);
1379 struct ccw_driver
*cdrv
= cdev
->drv
;
1386 spin_lock_irq(cdev
->ccwlock
);
1387 ret
= ccw_device_offline(cdev
);
1388 spin_unlock_irq(cdev
->ccwlock
);
1390 wait_event(cdev
->private->wait_q
,
1391 dev_fsm_final_state(cdev
));
1393 //FIXME: we can't fail!
1394 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
1395 "device 0.%x.%04x\n",
1396 ret
, cdev
->private->dev_id
.ssid
,
1397 cdev
->private->dev_id
.devno
);
1399 ccw_device_set_timeout(cdev
, 0);
1404 struct bus_type ccw_bus_type
= {
1406 .match
= ccw_bus_match
,
1407 .uevent
= ccw_uevent
,
1408 .probe
= ccw_device_probe
,
1409 .remove
= ccw_device_remove
,
1413 ccw_driver_register (struct ccw_driver
*cdriver
)
1415 struct device_driver
*drv
= &cdriver
->driver
;
1417 drv
->bus
= &ccw_bus_type
;
1418 drv
->name
= cdriver
->name
;
1420 return driver_register(drv
);
1424 ccw_driver_unregister (struct ccw_driver
*cdriver
)
1426 driver_unregister(&cdriver
->driver
);
1429 /* Helper func for qdio. */
1430 struct subchannel_id
1431 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1433 struct subchannel
*sch
;
1435 sch
= to_subchannel(cdev
->dev
.parent
);
1439 MODULE_LICENSE("GPL");
1440 EXPORT_SYMBOL(ccw_device_set_online
);
1441 EXPORT_SYMBOL(ccw_device_set_offline
);
1442 EXPORT_SYMBOL(ccw_driver_register
);
1443 EXPORT_SYMBOL(ccw_driver_unregister
);
1444 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1445 EXPORT_SYMBOL(ccw_bus_type
);
1446 EXPORT_SYMBOL(ccw_device_work
);
1447 EXPORT_SYMBOL(ccw_device_notify_work
);
1448 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);