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
, const char *prefix
,
60 struct ccw_device_id
*id
, const char *suffix
)
64 len
= snprintf(buf
, size
, "%sccw:t%04Xm%02X", prefix
, id
->cu_type
,
71 if (id
->dev_type
!= 0)
72 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
73 id
->dev_model
, suffix
);
75 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
80 /* Set up environment variables for ccw device uevent. Return 0 on success,
81 * non-zero otherwise. */
82 static int ccw_uevent(struct device
*dev
, char **envp
, int num_envp
,
83 char *buffer
, int buffer_size
)
85 struct ccw_device
*cdev
= to_ccwdev(dev
);
86 struct ccw_device_id
*id
= &(cdev
->id
);
91 len
= snprintf(buffer
, buffer_size
, "CU_TYPE=%04X", id
->cu_type
) + 1;
92 if (len
> buffer_size
|| i
>= num_envp
)
99 len
= snprintf(buffer
, buffer_size
, "CU_MODEL=%02X", id
->cu_model
) + 1;
100 if (len
> buffer_size
|| i
>= num_envp
)
106 /* The next two can be zero, that's ok for us */
108 len
= snprintf(buffer
, buffer_size
, "DEV_TYPE=%04X", id
->dev_type
) + 1;
109 if (len
> buffer_size
|| i
>= num_envp
)
116 len
= snprintf(buffer
, buffer_size
, "DEV_MODEL=%02X",
117 (unsigned char) id
->dev_model
) + 1;
118 if (len
> buffer_size
|| i
>= num_envp
)
125 len
= snprint_alias(buffer
, buffer_size
, "MODALIAS=", id
, "") + 1;
126 if (len
> buffer_size
|| i
>= num_envp
)
137 struct bus_type ccw_bus_type
;
139 static int io_subchannel_probe (struct subchannel
*);
140 static int io_subchannel_remove (struct subchannel
*);
141 void io_subchannel_irq (struct device
*);
142 static int io_subchannel_notify(struct device
*, int);
143 static void io_subchannel_verify(struct device
*);
144 static void io_subchannel_ioterm(struct device
*);
145 static void io_subchannel_shutdown(struct subchannel
*);
147 struct css_driver io_subchannel_driver
= {
148 .subchannel_type
= SUBCHANNEL_TYPE_IO
,
150 .name
= "io_subchannel",
151 .bus
= &css_bus_type
,
153 .irq
= io_subchannel_irq
,
154 .notify
= io_subchannel_notify
,
155 .verify
= io_subchannel_verify
,
156 .termination
= io_subchannel_ioterm
,
157 .probe
= io_subchannel_probe
,
158 .remove
= io_subchannel_remove
,
159 .shutdown
= io_subchannel_shutdown
,
162 struct workqueue_struct
*ccw_device_work
;
163 struct workqueue_struct
*ccw_device_notify_work
;
164 wait_queue_head_t ccw_device_init_wq
;
165 atomic_t ccw_device_init_count
;
168 init_ccw_bus_type (void)
172 init_waitqueue_head(&ccw_device_init_wq
);
173 atomic_set(&ccw_device_init_count
, 0);
175 ccw_device_work
= create_singlethread_workqueue("cio");
176 if (!ccw_device_work
)
177 return -ENOMEM
; /* FIXME: better errno ? */
178 ccw_device_notify_work
= create_singlethread_workqueue("cio_notify");
179 if (!ccw_device_notify_work
) {
180 ret
= -ENOMEM
; /* FIXME: better errno ? */
183 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
185 ret
= -ENOMEM
; /* FIXME: better errno ? */
188 if ((ret
= bus_register (&ccw_bus_type
)))
191 if ((ret
= driver_register(&io_subchannel_driver
.drv
)))
194 wait_event(ccw_device_init_wq
,
195 atomic_read(&ccw_device_init_count
) == 0);
196 flush_workqueue(ccw_device_work
);
200 destroy_workqueue(ccw_device_work
);
201 if (ccw_device_notify_work
)
202 destroy_workqueue(ccw_device_notify_work
);
204 destroy_workqueue(slow_path_wq
);
209 cleanup_ccw_bus_type (void)
211 driver_unregister(&io_subchannel_driver
.drv
);
212 bus_unregister(&ccw_bus_type
);
213 destroy_workqueue(ccw_device_notify_work
);
214 destroy_workqueue(ccw_device_work
);
217 subsys_initcall(init_ccw_bus_type
);
218 module_exit(cleanup_ccw_bus_type
);
220 /************************ device handling **************************/
223 * A ccw_device has some interfaces in sysfs in addition to the
225 * The following entries are designed to export the information which
226 * resided in 2.4 in /proc/subchannels. Subchannel and device number
227 * are obvious, so they don't have an entry :)
228 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
231 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
233 struct subchannel
*sch
= to_subchannel(dev
);
234 struct ssd_info
*ssd
= &sch
->ssd_info
;
239 for (chp
= 0; chp
< 8; chp
++)
240 ret
+= sprintf (buf
+ret
, "%02x ", ssd
->chpid
[chp
]);
242 ret
+= sprintf (buf
, "n/a");
243 ret
+= sprintf (buf
+ret
, "\n");
244 return min((ssize_t
)PAGE_SIZE
, ret
);
248 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
250 struct subchannel
*sch
= to_subchannel(dev
);
251 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
253 return sprintf (buf
, "%02x %02x %02x\n",
254 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
258 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
260 struct ccw_device
*cdev
= to_ccwdev(dev
);
261 struct ccw_device_id
*id
= &(cdev
->id
);
263 if (id
->dev_type
!= 0)
264 return sprintf(buf
, "%04x/%02x\n",
265 id
->dev_type
, id
->dev_model
);
267 return sprintf(buf
, "n/a\n");
271 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
273 struct ccw_device
*cdev
= to_ccwdev(dev
);
274 struct ccw_device_id
*id
= &(cdev
->id
);
276 return sprintf(buf
, "%04x/%02x\n",
277 id
->cu_type
, id
->cu_model
);
281 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
283 struct ccw_device
*cdev
= to_ccwdev(dev
);
284 struct ccw_device_id
*id
= &(cdev
->id
);
287 len
= snprint_alias(buf
, PAGE_SIZE
, "", id
, "\n") + 1;
289 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
293 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
295 struct ccw_device
*cdev
= to_ccwdev(dev
);
297 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
300 int ccw_device_is_orphan(struct ccw_device
*cdev
)
302 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
305 static void ccw_device_unregister(struct work_struct
*work
)
307 struct ccw_device_private
*priv
;
308 struct ccw_device
*cdev
;
310 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
312 if (test_and_clear_bit(1, &cdev
->private->registered
))
313 device_unregister(&cdev
->dev
);
314 put_device(&cdev
->dev
);
318 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
320 struct subchannel
*sch
;
323 * Forced offline in disconnected state means
324 * 'throw away device'.
326 if (ccw_device_is_orphan(cdev
)) {
327 /* Deregister ccw device. */
328 spin_lock_irqsave(cdev
->ccwlock
, flags
);
329 cdev
->private->state
= DEV_STATE_NOT_OPER
;
330 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
331 if (get_device(&cdev
->dev
)) {
332 PREPARE_WORK(&cdev
->private->kick_work
,
333 ccw_device_unregister
);
334 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
338 sch
= to_subchannel(cdev
->dev
.parent
);
339 css_sch_device_unregister(sch
);
340 /* Reset intparm to zeroes. */
341 sch
->schib
.pmcw
.intparm
= 0;
343 put_device(&sch
->dev
);
347 ccw_device_set_offline(struct ccw_device
*cdev
)
353 if (!cdev
->online
|| !cdev
->drv
)
356 if (cdev
->drv
->set_offline
) {
357 ret
= cdev
->drv
->set_offline(cdev
);
362 spin_lock_irq(cdev
->ccwlock
);
363 ret
= ccw_device_offline(cdev
);
364 if (ret
== -ENODEV
) {
365 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
366 cdev
->private->state
= DEV_STATE_OFFLINE
;
367 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
369 spin_unlock_irq(cdev
->ccwlock
);
372 spin_unlock_irq(cdev
->ccwlock
);
374 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
376 pr_debug("ccw_device_offline returned %d, device %s\n",
377 ret
, cdev
->dev
.bus_id
);
384 ccw_device_set_online(struct ccw_device
*cdev
)
390 if (cdev
->online
|| !cdev
->drv
)
393 spin_lock_irq(cdev
->ccwlock
);
394 ret
= ccw_device_online(cdev
);
395 spin_unlock_irq(cdev
->ccwlock
);
397 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
399 pr_debug("ccw_device_online returned %d, device %s\n",
400 ret
, cdev
->dev
.bus_id
);
403 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
405 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
409 spin_lock_irq(cdev
->ccwlock
);
410 ret
= ccw_device_offline(cdev
);
411 spin_unlock_irq(cdev
->ccwlock
);
413 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
415 pr_debug("ccw_device_offline returned %d, device %s\n",
416 ret
, cdev
->dev
.bus_id
);
417 return (ret
== 0) ? -ENODEV
: ret
;
421 online_store (struct device
*dev
, struct device_attribute
*attr
, const char *buf
, size_t count
)
423 struct ccw_device
*cdev
= to_ccwdev(dev
);
427 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
430 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
431 atomic_set(&cdev
->private->onoff
, 0);
434 if (!strncmp(buf
, "force\n", count
)) {
439 i
= simple_strtoul(buf
, &tmp
, 16);
442 /* Do device recognition, if needed. */
443 if (cdev
->id
.cu_type
== 0) {
444 ret
= ccw_device_recognition(cdev
);
446 printk(KERN_WARNING
"Couldn't start recognition "
447 "for device %s (ret=%d)\n",
448 cdev
->dev
.bus_id
, 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
);
457 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
458 ccw_device_remove_disconnected(cdev
);
459 else if (cdev
->drv
&& cdev
->drv
->set_offline
)
460 ccw_device_set_offline(cdev
);
462 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
463 ret
= ccw_device_stlck(cdev
);
465 printk(KERN_WARNING
"ccw_device_stlck for device %s "
466 "returned %d!\n", cdev
->dev
.bus_id
, ret
);
469 /* Do device recognition, if needed. */
470 if (cdev
->id
.cu_type
== 0) {
471 cdev
->private->state
= DEV_STATE_NOT_OPER
;
472 ret
= ccw_device_recognition(cdev
);
474 printk(KERN_WARNING
"Couldn't start recognition "
475 "for device %s (ret=%d)\n",
476 cdev
->dev
.bus_id
, ret
);
479 wait_event(cdev
->private->wait_q
,
480 cdev
->private->flags
.recog_done
);
482 if (cdev
->drv
&& cdev
->drv
->set_online
)
483 ccw_device_set_online(cdev
);
487 module_put(cdev
->drv
->owner
);
488 atomic_set(&cdev
->private->onoff
, 0);
493 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
495 struct ccw_device
*cdev
= to_ccwdev(dev
);
496 struct subchannel
*sch
;
498 if (ccw_device_is_orphan(cdev
))
499 return sprintf(buf
, "no device\n");
500 switch (cdev
->private->state
) {
501 case DEV_STATE_BOXED
:
502 return sprintf(buf
, "boxed\n");
503 case DEV_STATE_DISCONNECTED
:
504 case DEV_STATE_DISCONNECTED_SENSE_ID
:
505 case DEV_STATE_NOT_OPER
:
506 sch
= to_subchannel(dev
->parent
);
508 return sprintf(buf
, "no path\n");
510 return sprintf(buf
, "no device\n");
512 /* All other states considered fine. */
513 return sprintf(buf
, "good\n");
517 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
518 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
519 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
520 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
521 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
522 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
523 extern struct device_attribute dev_attr_cmb_enable
;
524 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
526 static struct attribute
* subch_attrs
[] = {
527 &dev_attr_chpids
.attr
,
528 &dev_attr_pimpampom
.attr
,
532 static struct attribute_group subch_attr_group
= {
533 .attrs
= subch_attrs
,
536 struct attribute_group
*subch_attr_groups
[] = {
541 static struct attribute
* ccwdev_attrs
[] = {
542 &dev_attr_devtype
.attr
,
543 &dev_attr_cutype
.attr
,
544 &dev_attr_modalias
.attr
,
545 &dev_attr_online
.attr
,
546 &dev_attr_cmb_enable
.attr
,
547 &dev_attr_availability
.attr
,
551 static struct attribute_group ccwdev_attr_group
= {
552 .attrs
= ccwdev_attrs
,
556 device_add_files (struct device
*dev
)
558 return sysfs_create_group(&dev
->kobj
, &ccwdev_attr_group
);
562 device_remove_files(struct device
*dev
)
564 sysfs_remove_group(&dev
->kobj
, &ccwdev_attr_group
);
567 /* this is a simple abstraction for device_register that sets the
568 * correct bus type and adds the bus specific files */
569 static int ccw_device_register(struct ccw_device
*cdev
)
571 struct device
*dev
= &cdev
->dev
;
574 dev
->bus
= &ccw_bus_type
;
576 if ((ret
= device_add(dev
)))
579 set_bit(1, &cdev
->private->registered
);
580 if ((ret
= device_add_files(dev
))) {
581 if (test_and_clear_bit(1, &cdev
->private->registered
))
588 struct ccw_dev_id dev_id
;
589 struct ccw_device
* sibling
;
593 match_devno(struct device
* dev
, void * data
)
595 struct match_data
* d
= data
;
596 struct ccw_device
* cdev
;
598 cdev
= to_ccwdev(dev
);
599 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
600 !ccw_device_is_orphan(cdev
) &&
601 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
602 (cdev
!= d
->sibling
))
607 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
608 struct ccw_device
*sibling
)
611 struct match_data data
;
613 data
.dev_id
= *dev_id
;
614 data
.sibling
= sibling
;
615 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
617 return dev
? to_ccwdev(dev
) : NULL
;
620 static int match_orphan(struct device
*dev
, void *data
)
622 struct ccw_dev_id
*dev_id
;
623 struct ccw_device
*cdev
;
626 cdev
= to_ccwdev(dev
);
627 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
630 static struct ccw_device
*
631 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
632 struct ccw_dev_id
*dev_id
)
636 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
639 return dev
? to_ccwdev(dev
) : NULL
;
643 ccw_device_add_changed(struct work_struct
*work
)
645 struct ccw_device_private
*priv
;
646 struct ccw_device
*cdev
;
648 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
650 if (device_add(&cdev
->dev
)) {
651 put_device(&cdev
->dev
);
654 set_bit(1, &cdev
->private->registered
);
655 if (device_add_files(&cdev
->dev
)) {
656 if (test_and_clear_bit(1, &cdev
->private->registered
))
657 device_unregister(&cdev
->dev
);
661 void ccw_device_do_unreg_rereg(struct work_struct
*work
)
663 struct ccw_device_private
*priv
;
664 struct ccw_device
*cdev
;
665 struct subchannel
*sch
;
667 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
669 sch
= to_subchannel(cdev
->dev
.parent
);
671 device_remove_files(&cdev
->dev
);
672 if (test_and_clear_bit(1, &cdev
->private->registered
))
673 device_del(&cdev
->dev
);
674 PREPARE_WORK(&cdev
->private->kick_work
,
675 ccw_device_add_changed
);
676 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
680 ccw_device_release(struct device
*dev
)
682 struct ccw_device
*cdev
;
684 cdev
= to_ccwdev(dev
);
685 kfree(cdev
->private);
689 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
691 struct ccw_device
*cdev
;
693 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
695 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
696 GFP_KERNEL
| GFP_DMA
);
701 return ERR_PTR(-ENOMEM
);
704 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
705 struct ccw_device
*cdev
)
707 cdev
->private->cdev
= cdev
;
708 atomic_set(&cdev
->private->onoff
, 0);
709 cdev
->dev
.parent
= &sch
->dev
;
710 cdev
->dev
.release
= ccw_device_release
;
711 INIT_LIST_HEAD(&cdev
->private->kick_work
.entry
);
712 /* Do first half of device_register. */
713 device_initialize(&cdev
->dev
);
714 if (!get_device(&sch
->dev
)) {
715 if (cdev
->dev
.release
)
716 cdev
->dev
.release(&cdev
->dev
);
722 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
724 struct ccw_device
*cdev
;
727 cdev
= io_subchannel_allocate_dev(sch
);
729 ret
= io_subchannel_initialize_dev(sch
, cdev
);
738 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
740 static void sch_attach_device(struct subchannel
*sch
,
741 struct ccw_device
*cdev
)
743 spin_lock_irq(sch
->lock
);
744 sch
->dev
.driver_data
= cdev
;
745 cdev
->private->schid
= sch
->schid
;
746 cdev
->ccwlock
= sch
->lock
;
747 device_trigger_reprobe(sch
);
748 spin_unlock_irq(sch
->lock
);
751 static void sch_attach_disconnected_device(struct subchannel
*sch
,
752 struct ccw_device
*cdev
)
754 struct subchannel
*other_sch
;
757 other_sch
= to_subchannel(get_device(cdev
->dev
.parent
));
758 ret
= device_move(&cdev
->dev
, &sch
->dev
);
760 CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
761 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
762 cdev
->private->dev_id
.devno
, ret
);
763 put_device(&other_sch
->dev
);
766 other_sch
->dev
.driver_data
= NULL
;
767 /* No need to keep a subchannel without ccw device around. */
768 css_sch_device_unregister(other_sch
);
769 put_device(&other_sch
->dev
);
770 sch_attach_device(sch
, cdev
);
773 static void sch_attach_orphaned_device(struct subchannel
*sch
,
774 struct ccw_device
*cdev
)
778 /* Try to move the ccw device to its new subchannel. */
779 ret
= device_move(&cdev
->dev
, &sch
->dev
);
781 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
782 "failed (ret=%d)!\n",
783 cdev
->private->dev_id
.ssid
,
784 cdev
->private->dev_id
.devno
, ret
);
787 sch_attach_device(sch
, cdev
);
790 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
792 struct ccw_device
*cdev
;
794 /* Need to allocate a new ccw device. */
795 cdev
= io_subchannel_create_ccwdev(sch
);
797 /* OK, we did everything we could... */
798 css_sch_device_unregister(sch
);
801 spin_lock_irq(sch
->lock
);
802 sch
->dev
.driver_data
= cdev
;
803 spin_unlock_irq(sch
->lock
);
804 /* Start recognition for the new ccw device. */
805 if (io_subchannel_recog(cdev
, sch
)) {
806 spin_lock_irq(sch
->lock
);
807 sch
->dev
.driver_data
= NULL
;
808 spin_unlock_irq(sch
->lock
);
809 if (cdev
->dev
.release
)
810 cdev
->dev
.release(&cdev
->dev
);
811 css_sch_device_unregister(sch
);
816 void ccw_device_move_to_orphanage(struct work_struct
*work
)
818 struct ccw_device_private
*priv
;
819 struct ccw_device
*cdev
;
820 struct ccw_device
*replacing_cdev
;
821 struct subchannel
*sch
;
823 struct channel_subsystem
*css
;
824 struct ccw_dev_id dev_id
;
826 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
828 sch
= to_subchannel(cdev
->dev
.parent
);
829 css
= to_css(sch
->dev
.parent
);
830 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
831 dev_id
.ssid
= sch
->schid
.ssid
;
834 * Move the orphaned ccw device to the orphanage so the replacing
835 * ccw device can take its place on the subchannel.
837 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
);
839 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
840 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
841 cdev
->private->dev_id
.devno
, ret
);
844 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
846 * Search for the replacing ccw device
847 * - among the disconnected devices
850 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
851 if (replacing_cdev
) {
852 sch_attach_disconnected_device(sch
, replacing_cdev
);
855 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
856 if (replacing_cdev
) {
857 sch_attach_orphaned_device(sch
, replacing_cdev
);
860 sch_create_and_recog_new_device(sch
);
864 * Register recognized device.
867 io_subchannel_register(struct work_struct
*work
)
869 struct ccw_device_private
*priv
;
870 struct ccw_device
*cdev
;
871 struct subchannel
*sch
;
875 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
877 sch
= to_subchannel(cdev
->dev
.parent
);
880 * io_subchannel_register() will also be called after device
881 * recognition has been done for a boxed device (which will already
882 * be registered). We need to reprobe since we may now have sense id
885 if (klist_node_attached(&cdev
->dev
.knode_parent
)) {
887 ret
= device_reprobe(&cdev
->dev
);
889 /* We can't do much here. */
890 dev_info(&cdev
->dev
, "device_reprobe() returned"
895 /* make it known to the system */
896 ret
= ccw_device_register(cdev
);
898 printk (KERN_WARNING
"%s: could not register %s\n",
899 __func__
, cdev
->dev
.bus_id
);
900 put_device(&cdev
->dev
);
901 spin_lock_irqsave(sch
->lock
, flags
);
902 sch
->dev
.driver_data
= NULL
;
903 spin_unlock_irqrestore(sch
->lock
, flags
);
904 kfree (cdev
->private);
906 put_device(&sch
->dev
);
907 if (atomic_dec_and_test(&ccw_device_init_count
))
908 wake_up(&ccw_device_init_wq
);
911 put_device(&cdev
->dev
);
913 cdev
->private->flags
.recog_done
= 1;
914 put_device(&sch
->dev
);
915 wake_up(&cdev
->private->wait_q
);
916 if (atomic_dec_and_test(&ccw_device_init_count
))
917 wake_up(&ccw_device_init_wq
);
921 ccw_device_call_sch_unregister(struct work_struct
*work
)
923 struct ccw_device_private
*priv
;
924 struct ccw_device
*cdev
;
925 struct subchannel
*sch
;
927 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
929 sch
= to_subchannel(cdev
->dev
.parent
);
930 css_sch_device_unregister(sch
);
931 /* Reset intparm to zeroes. */
932 sch
->schib
.pmcw
.intparm
= 0;
934 put_device(&cdev
->dev
);
935 put_device(&sch
->dev
);
939 * subchannel recognition done. Called from the state machine.
942 io_subchannel_recog_done(struct ccw_device
*cdev
)
944 struct subchannel
*sch
;
946 if (css_init_done
== 0) {
947 cdev
->private->flags
.recog_done
= 1;
950 switch (cdev
->private->state
) {
951 case DEV_STATE_NOT_OPER
:
952 cdev
->private->flags
.recog_done
= 1;
953 /* Remove device found not operational. */
954 if (!get_device(&cdev
->dev
))
956 sch
= to_subchannel(cdev
->dev
.parent
);
957 PREPARE_WORK(&cdev
->private->kick_work
,
958 ccw_device_call_sch_unregister
);
959 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
960 if (atomic_dec_and_test(&ccw_device_init_count
))
961 wake_up(&ccw_device_init_wq
);
963 case DEV_STATE_BOXED
:
964 /* Device did not respond in time. */
965 case DEV_STATE_OFFLINE
:
967 * We can't register the device in interrupt context so
968 * we schedule a work item.
970 if (!get_device(&cdev
->dev
))
972 PREPARE_WORK(&cdev
->private->kick_work
,
973 io_subchannel_register
);
974 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
980 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
983 struct ccw_device_private
*priv
;
985 sch
->dev
.driver_data
= cdev
;
986 sch
->driver
= &io_subchannel_driver
;
987 cdev
->ccwlock
= sch
->lock
;
989 /* Init private data. */
990 priv
= cdev
->private;
991 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
992 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
993 priv
->schid
= sch
->schid
;
994 priv
->state
= DEV_STATE_NOT_OPER
;
995 INIT_LIST_HEAD(&priv
->cmb_list
);
996 init_waitqueue_head(&priv
->wait_q
);
997 init_timer(&priv
->timer
);
999 /* Set an initial name for the device. */
1000 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
1001 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1003 /* Increase counter of devices currently in recognition. */
1004 atomic_inc(&ccw_device_init_count
);
1006 /* Start async. device sensing. */
1007 spin_lock_irq(sch
->lock
);
1008 rc
= ccw_device_recognition(cdev
);
1009 spin_unlock_irq(sch
->lock
);
1011 if (atomic_dec_and_test(&ccw_device_init_count
))
1012 wake_up(&ccw_device_init_wq
);
1017 static void ccw_device_move_to_sch(struct work_struct
*work
)
1019 struct ccw_device_private
*priv
;
1021 struct subchannel
*sch
;
1022 struct ccw_device
*cdev
;
1023 struct subchannel
*former_parent
;
1025 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1028 former_parent
= ccw_device_is_orphan(cdev
) ?
1029 NULL
: to_subchannel(get_device(cdev
->dev
.parent
));
1030 mutex_lock(&sch
->reg_mutex
);
1031 /* Try to move the ccw device to its new subchannel. */
1032 rc
= device_move(&cdev
->dev
, &sch
->dev
);
1033 mutex_unlock(&sch
->reg_mutex
);
1035 CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
1036 "0.%x.%04x failed (ret=%d)!\n",
1037 cdev
->private->dev_id
.ssid
,
1038 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1039 sch
->schid
.sch_no
, rc
);
1040 css_sch_device_unregister(sch
);
1043 if (former_parent
) {
1044 spin_lock_irq(former_parent
->lock
);
1045 former_parent
->dev
.driver_data
= NULL
;
1046 spin_unlock_irq(former_parent
->lock
);
1047 css_sch_device_unregister(former_parent
);
1048 /* Reset intparm to zeroes. */
1049 former_parent
->schib
.pmcw
.intparm
= 0;
1050 cio_modify(former_parent
);
1052 sch_attach_device(sch
, cdev
);
1055 put_device(&former_parent
->dev
);
1056 put_device(&cdev
->dev
);
1060 io_subchannel_probe (struct subchannel
*sch
)
1062 struct ccw_device
*cdev
;
1064 unsigned long flags
;
1065 struct ccw_dev_id dev_id
;
1067 if (sch
->dev
.driver_data
) {
1069 * This subchannel already has an associated ccw_device.
1070 * Register it and exit. This happens for all early
1071 * device, e.g. the console.
1073 cdev
= sch
->dev
.driver_data
;
1074 device_initialize(&cdev
->dev
);
1075 ccw_device_register(cdev
);
1077 * Check if the device is already online. If it is
1078 * the reference count needs to be corrected
1079 * (see ccw_device_online and css_init_done for the
1082 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1083 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1084 cdev
->private->state
!= DEV_STATE_BOXED
)
1085 get_device(&cdev
->dev
);
1089 * First check if a fitting device may be found amongst the
1090 * disconnected devices or in the orphanage.
1092 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1093 dev_id
.ssid
= sch
->schid
.ssid
;
1094 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1096 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1100 * Schedule moving the device until when we have a registered
1101 * subchannel to move to and succeed the probe. We can
1102 * unregister later again, when the probe is through.
1104 cdev
->private->sch
= sch
;
1105 PREPARE_WORK(&cdev
->private->kick_work
,
1106 ccw_device_move_to_sch
);
1107 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1110 cdev
= io_subchannel_create_ccwdev(sch
);
1112 return PTR_ERR(cdev
);
1114 rc
= io_subchannel_recog(cdev
, sch
);
1116 spin_lock_irqsave(sch
->lock
, flags
);
1117 sch
->dev
.driver_data
= NULL
;
1118 spin_unlock_irqrestore(sch
->lock
, flags
);
1119 if (cdev
->dev
.release
)
1120 cdev
->dev
.release(&cdev
->dev
);
1127 io_subchannel_remove (struct subchannel
*sch
)
1129 struct ccw_device
*cdev
;
1130 unsigned long flags
;
1132 if (!sch
->dev
.driver_data
)
1134 cdev
= sch
->dev
.driver_data
;
1135 /* Set ccw device to not operational and drop reference. */
1136 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1137 sch
->dev
.driver_data
= NULL
;
1138 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1139 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1141 * Put unregistration on workqueue to avoid livelocks on the css bus
1144 if (get_device(&cdev
->dev
)) {
1145 PREPARE_WORK(&cdev
->private->kick_work
,
1146 ccw_device_unregister
);
1147 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
1153 io_subchannel_notify(struct device
*dev
, int event
)
1155 struct ccw_device
*cdev
;
1157 cdev
= dev
->driver_data
;
1164 return cdev
->drv
->notify
? cdev
->drv
->notify(cdev
, event
) : 0;
1168 io_subchannel_verify(struct device
*dev
)
1170 struct ccw_device
*cdev
;
1172 cdev
= dev
->driver_data
;
1174 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1178 io_subchannel_ioterm(struct device
*dev
)
1180 struct ccw_device
*cdev
;
1182 cdev
= dev
->driver_data
;
1185 /* Internal I/O will be retried by the interrupt handler. */
1186 if (cdev
->private->flags
.intretry
)
1188 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1190 cdev
->handler(cdev
, cdev
->private->intparm
,
1195 io_subchannel_shutdown(struct subchannel
*sch
)
1197 struct ccw_device
*cdev
;
1200 cdev
= sch
->dev
.driver_data
;
1202 if (cio_is_console(sch
->schid
))
1204 if (!sch
->schib
.pmcw
.ena
)
1205 /* Nothing to do. */
1207 ret
= cio_disable_subchannel(sch
);
1209 /* Subchannel is disabled, we're done. */
1211 cdev
->private->state
= DEV_STATE_QUIESCE
;
1213 cdev
->handler(cdev
, cdev
->private->intparm
,
1215 ret
= ccw_device_cancel_halt_clear(cdev
);
1216 if (ret
== -EBUSY
) {
1217 ccw_device_set_timeout(cdev
, HZ
/10);
1218 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1220 cio_disable_subchannel(sch
);
1223 #ifdef CONFIG_CCW_CONSOLE
1224 static struct ccw_device console_cdev
;
1225 static struct ccw_device_private console_private
;
1226 static int console_cdev_in_use
;
1228 static DEFINE_SPINLOCK(ccw_console_lock
);
1230 spinlock_t
* cio_get_console_lock(void)
1232 return &ccw_console_lock
;
1236 ccw_device_console_enable (struct ccw_device
*cdev
, struct subchannel
*sch
)
1240 /* Initialize the ccw_device structure. */
1241 cdev
->dev
.parent
= &sch
->dev
;
1242 rc
= io_subchannel_recog(cdev
, sch
);
1246 /* Now wait for the async. recognition to come to an end. */
1247 spin_lock_irq(cdev
->ccwlock
);
1248 while (!dev_fsm_final_state(cdev
))
1251 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1253 ccw_device_online(cdev
);
1254 while (!dev_fsm_final_state(cdev
))
1256 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1260 spin_unlock_irq(cdev
->ccwlock
);
1265 ccw_device_probe_console(void)
1267 struct subchannel
*sch
;
1270 if (xchg(&console_cdev_in_use
, 1) != 0)
1271 return ERR_PTR(-EBUSY
);
1272 sch
= cio_probe_console();
1274 console_cdev_in_use
= 0;
1275 return (void *) sch
;
1277 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1278 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1279 console_cdev
.private = &console_private
;
1280 console_private
.cdev
= &console_cdev
;
1281 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1283 cio_release_console();
1284 console_cdev_in_use
= 0;
1285 return ERR_PTR(ret
);
1287 console_cdev
.online
= 1;
1288 return &console_cdev
;
1293 * get ccw_device matching the busid, but only if owned by cdrv
1296 __ccwdev_check_busid(struct device
*dev
, void *id
)
1302 return (strncmp(bus_id
, dev
->bus_id
, BUS_ID_SIZE
) == 0);
1307 get_ccwdev_by_busid(struct ccw_driver
*cdrv
, const char *bus_id
)
1310 struct device_driver
*drv
;
1312 drv
= get_driver(&cdrv
->driver
);
1316 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1317 __ccwdev_check_busid
);
1320 return dev
? to_ccwdev(dev
) : NULL
;
1323 /************************** device driver handling ************************/
1325 /* This is the implementation of the ccw_driver class. The probe, remove
1326 * and release methods are initially very similar to the device_driver
1327 * implementations, with the difference that they have ccw_device
1330 * A ccw driver also contains the information that is needed for
1334 ccw_device_probe (struct device
*dev
)
1336 struct ccw_device
*cdev
= to_ccwdev(dev
);
1337 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1340 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1342 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1353 ccw_device_remove (struct device
*dev
)
1355 struct ccw_device
*cdev
= to_ccwdev(dev
);
1356 struct ccw_driver
*cdrv
= cdev
->drv
;
1359 pr_debug("removing device %s\n", cdev
->dev
.bus_id
);
1364 spin_lock_irq(cdev
->ccwlock
);
1365 ret
= ccw_device_offline(cdev
);
1366 spin_unlock_irq(cdev
->ccwlock
);
1368 wait_event(cdev
->private->wait_q
,
1369 dev_fsm_final_state(cdev
));
1371 //FIXME: we can't fail!
1372 pr_debug("ccw_device_offline returned %d, device %s\n",
1373 ret
, cdev
->dev
.bus_id
);
1375 ccw_device_set_timeout(cdev
, 0);
1380 struct bus_type ccw_bus_type
= {
1382 .match
= ccw_bus_match
,
1383 .uevent
= ccw_uevent
,
1384 .probe
= ccw_device_probe
,
1385 .remove
= ccw_device_remove
,
1389 ccw_driver_register (struct ccw_driver
*cdriver
)
1391 struct device_driver
*drv
= &cdriver
->driver
;
1393 drv
->bus
= &ccw_bus_type
;
1394 drv
->name
= cdriver
->name
;
1396 return driver_register(drv
);
1400 ccw_driver_unregister (struct ccw_driver
*cdriver
)
1402 driver_unregister(&cdriver
->driver
);
1405 /* Helper func for qdio. */
1406 struct subchannel_id
1407 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1409 struct subchannel
*sch
;
1411 sch
= to_subchannel(cdev
->dev
.parent
);
1415 MODULE_LICENSE("GPL");
1416 EXPORT_SYMBOL(ccw_device_set_online
);
1417 EXPORT_SYMBOL(ccw_device_set_offline
);
1418 EXPORT_SYMBOL(ccw_driver_register
);
1419 EXPORT_SYMBOL(ccw_driver_unregister
);
1420 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1421 EXPORT_SYMBOL(ccw_bus_type
);
1422 EXPORT_SYMBOL(ccw_device_work
);
1423 EXPORT_SYMBOL(ccw_device_notify_work
);
1424 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);