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 static int io_subchannel_notify(struct device
*, int);
142 static void io_subchannel_verify(struct device
*);
143 static void io_subchannel_ioterm(struct device
*);
144 static void io_subchannel_shutdown(struct subchannel
*);
146 struct css_driver io_subchannel_driver
= {
147 .subchannel_type
= SUBCHANNEL_TYPE_IO
,
149 .name
= "io_subchannel",
150 .bus
= &css_bus_type
,
152 .irq
= io_subchannel_irq
,
153 .notify
= io_subchannel_notify
,
154 .verify
= io_subchannel_verify
,
155 .termination
= io_subchannel_ioterm
,
156 .probe
= io_subchannel_probe
,
157 .remove
= io_subchannel_remove
,
158 .shutdown
= io_subchannel_shutdown
,
161 struct workqueue_struct
*ccw_device_work
;
162 struct workqueue_struct
*ccw_device_notify_work
;
163 wait_queue_head_t ccw_device_init_wq
;
164 atomic_t ccw_device_init_count
;
167 init_ccw_bus_type (void)
171 init_waitqueue_head(&ccw_device_init_wq
);
172 atomic_set(&ccw_device_init_count
, 0);
174 ccw_device_work
= create_singlethread_workqueue("cio");
175 if (!ccw_device_work
)
176 return -ENOMEM
; /* FIXME: better errno ? */
177 ccw_device_notify_work
= create_singlethread_workqueue("cio_notify");
178 if (!ccw_device_notify_work
) {
179 ret
= -ENOMEM
; /* FIXME: better errno ? */
182 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
184 ret
= -ENOMEM
; /* FIXME: better errno ? */
187 if ((ret
= bus_register (&ccw_bus_type
)))
190 if ((ret
= driver_register(&io_subchannel_driver
.drv
)))
193 wait_event(ccw_device_init_wq
,
194 atomic_read(&ccw_device_init_count
) == 0);
195 flush_workqueue(ccw_device_work
);
199 destroy_workqueue(ccw_device_work
);
200 if (ccw_device_notify_work
)
201 destroy_workqueue(ccw_device_notify_work
);
203 destroy_workqueue(slow_path_wq
);
208 cleanup_ccw_bus_type (void)
210 driver_unregister(&io_subchannel_driver
.drv
);
211 bus_unregister(&ccw_bus_type
);
212 destroy_workqueue(ccw_device_notify_work
);
213 destroy_workqueue(ccw_device_work
);
216 subsys_initcall(init_ccw_bus_type
);
217 module_exit(cleanup_ccw_bus_type
);
219 /************************ device handling **************************/
222 * A ccw_device has some interfaces in sysfs in addition to the
224 * The following entries are designed to export the information which
225 * resided in 2.4 in /proc/subchannels. Subchannel and device number
226 * are obvious, so they don't have an entry :)
227 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
230 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
232 struct subchannel
*sch
= to_subchannel(dev
);
233 struct ssd_info
*ssd
= &sch
->ssd_info
;
237 for (chp
= 0; chp
< 8; chp
++)
238 ret
+= sprintf (buf
+ret
, "%02x ", ssd
->chpid
[chp
]);
239 ret
+= sprintf (buf
+ret
, "\n");
240 return min((ssize_t
)PAGE_SIZE
, ret
);
244 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
246 struct subchannel
*sch
= to_subchannel(dev
);
247 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
249 return sprintf (buf
, "%02x %02x %02x\n",
250 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
254 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
256 struct ccw_device
*cdev
= to_ccwdev(dev
);
257 struct ccw_device_id
*id
= &(cdev
->id
);
259 if (id
->dev_type
!= 0)
260 return sprintf(buf
, "%04x/%02x\n",
261 id
->dev_type
, id
->dev_model
);
263 return sprintf(buf
, "n/a\n");
267 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
269 struct ccw_device
*cdev
= to_ccwdev(dev
);
270 struct ccw_device_id
*id
= &(cdev
->id
);
272 return sprintf(buf
, "%04x/%02x\n",
273 id
->cu_type
, id
->cu_model
);
277 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
279 struct ccw_device
*cdev
= to_ccwdev(dev
);
280 struct ccw_device_id
*id
= &(cdev
->id
);
283 len
= snprint_alias(buf
, PAGE_SIZE
, "", id
, "\n") + 1;
285 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
289 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
291 struct ccw_device
*cdev
= to_ccwdev(dev
);
293 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
296 int ccw_device_is_orphan(struct ccw_device
*cdev
)
298 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
301 static void ccw_device_unregister(struct work_struct
*work
)
303 struct ccw_device_private
*priv
;
304 struct ccw_device
*cdev
;
306 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
308 if (test_and_clear_bit(1, &cdev
->private->registered
))
309 device_unregister(&cdev
->dev
);
310 put_device(&cdev
->dev
);
314 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
316 struct subchannel
*sch
;
319 * Forced offline in disconnected state means
320 * 'throw away device'.
322 if (ccw_device_is_orphan(cdev
)) {
323 /* Deregister ccw device. */
324 spin_lock_irqsave(cdev
->ccwlock
, flags
);
325 cdev
->private->state
= DEV_STATE_NOT_OPER
;
326 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
327 if (get_device(&cdev
->dev
)) {
328 PREPARE_WORK(&cdev
->private->kick_work
,
329 ccw_device_unregister
);
330 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
334 sch
= to_subchannel(cdev
->dev
.parent
);
335 css_sch_device_unregister(sch
);
336 /* Reset intparm to zeroes. */
337 sch
->schib
.pmcw
.intparm
= 0;
339 put_device(&sch
->dev
);
343 ccw_device_set_offline(struct ccw_device
*cdev
)
349 if (!cdev
->online
|| !cdev
->drv
)
352 if (cdev
->drv
->set_offline
) {
353 ret
= cdev
->drv
->set_offline(cdev
);
358 spin_lock_irq(cdev
->ccwlock
);
359 ret
= ccw_device_offline(cdev
);
360 if (ret
== -ENODEV
) {
361 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
362 cdev
->private->state
= DEV_STATE_OFFLINE
;
363 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
365 spin_unlock_irq(cdev
->ccwlock
);
368 spin_unlock_irq(cdev
->ccwlock
);
370 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
372 pr_debug("ccw_device_offline returned %d, device %s\n",
373 ret
, cdev
->dev
.bus_id
);
380 ccw_device_set_online(struct ccw_device
*cdev
)
386 if (cdev
->online
|| !cdev
->drv
)
389 spin_lock_irq(cdev
->ccwlock
);
390 ret
= ccw_device_online(cdev
);
391 spin_unlock_irq(cdev
->ccwlock
);
393 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
395 pr_debug("ccw_device_online returned %d, device %s\n",
396 ret
, cdev
->dev
.bus_id
);
399 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
401 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
405 spin_lock_irq(cdev
->ccwlock
);
406 ret
= ccw_device_offline(cdev
);
407 spin_unlock_irq(cdev
->ccwlock
);
409 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
411 pr_debug("ccw_device_offline returned %d, device %s\n",
412 ret
, cdev
->dev
.bus_id
);
413 return (ret
== 0) ? -ENODEV
: ret
;
417 online_store (struct device
*dev
, struct device_attribute
*attr
, const char *buf
, size_t count
)
419 struct ccw_device
*cdev
= to_ccwdev(dev
);
423 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
426 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
427 atomic_set(&cdev
->private->onoff
, 0);
430 if (!strncmp(buf
, "force\n", count
)) {
435 i
= simple_strtoul(buf
, &tmp
, 16);
438 /* Do device recognition, if needed. */
439 if (cdev
->id
.cu_type
== 0) {
440 ret
= ccw_device_recognition(cdev
);
442 printk(KERN_WARNING
"Couldn't start recognition "
443 "for device %s (ret=%d)\n",
444 cdev
->dev
.bus_id
, ret
);
447 wait_event(cdev
->private->wait_q
,
448 cdev
->private->flags
.recog_done
);
450 if (cdev
->drv
&& cdev
->drv
->set_online
)
451 ccw_device_set_online(cdev
);
453 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
454 ccw_device_remove_disconnected(cdev
);
455 else if (cdev
->drv
&& cdev
->drv
->set_offline
)
456 ccw_device_set_offline(cdev
);
458 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
459 ret
= ccw_device_stlck(cdev
);
461 printk(KERN_WARNING
"ccw_device_stlck for device %s "
462 "returned %d!\n", cdev
->dev
.bus_id
, ret
);
465 /* Do device recognition, if needed. */
466 if (cdev
->id
.cu_type
== 0) {
467 cdev
->private->state
= DEV_STATE_NOT_OPER
;
468 ret
= ccw_device_recognition(cdev
);
470 printk(KERN_WARNING
"Couldn't start recognition "
471 "for device %s (ret=%d)\n",
472 cdev
->dev
.bus_id
, ret
);
475 wait_event(cdev
->private->wait_q
,
476 cdev
->private->flags
.recog_done
);
478 if (cdev
->drv
&& cdev
->drv
->set_online
)
479 ccw_device_set_online(cdev
);
483 module_put(cdev
->drv
->owner
);
484 atomic_set(&cdev
->private->onoff
, 0);
489 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
491 struct ccw_device
*cdev
= to_ccwdev(dev
);
492 struct subchannel
*sch
;
494 if (ccw_device_is_orphan(cdev
))
495 return sprintf(buf
, "no device\n");
496 switch (cdev
->private->state
) {
497 case DEV_STATE_BOXED
:
498 return sprintf(buf
, "boxed\n");
499 case DEV_STATE_DISCONNECTED
:
500 case DEV_STATE_DISCONNECTED_SENSE_ID
:
501 case DEV_STATE_NOT_OPER
:
502 sch
= to_subchannel(dev
->parent
);
504 return sprintf(buf
, "no path\n");
506 return sprintf(buf
, "no device\n");
508 /* All other states considered fine. */
509 return sprintf(buf
, "good\n");
513 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
514 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
515 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
516 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
517 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
518 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
519 extern struct device_attribute dev_attr_cmb_enable
;
520 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
522 static struct attribute
* subch_attrs
[] = {
523 &dev_attr_chpids
.attr
,
524 &dev_attr_pimpampom
.attr
,
528 static struct attribute_group subch_attr_group
= {
529 .attrs
= subch_attrs
,
532 struct attribute_group
*subch_attr_groups
[] = {
537 static struct attribute
* ccwdev_attrs
[] = {
538 &dev_attr_devtype
.attr
,
539 &dev_attr_cutype
.attr
,
540 &dev_attr_modalias
.attr
,
541 &dev_attr_online
.attr
,
542 &dev_attr_cmb_enable
.attr
,
543 &dev_attr_availability
.attr
,
547 static struct attribute_group ccwdev_attr_group
= {
548 .attrs
= ccwdev_attrs
,
552 device_add_files (struct device
*dev
)
554 return sysfs_create_group(&dev
->kobj
, &ccwdev_attr_group
);
558 device_remove_files(struct device
*dev
)
560 sysfs_remove_group(&dev
->kobj
, &ccwdev_attr_group
);
563 /* this is a simple abstraction for device_register that sets the
564 * correct bus type and adds the bus specific files */
565 static int ccw_device_register(struct ccw_device
*cdev
)
567 struct device
*dev
= &cdev
->dev
;
570 dev
->bus
= &ccw_bus_type
;
572 if ((ret
= device_add(dev
)))
575 set_bit(1, &cdev
->private->registered
);
576 if ((ret
= device_add_files(dev
))) {
577 if (test_and_clear_bit(1, &cdev
->private->registered
))
584 struct ccw_dev_id dev_id
;
585 struct ccw_device
* sibling
;
589 match_devno(struct device
* dev
, void * data
)
591 struct match_data
* d
= data
;
592 struct ccw_device
* cdev
;
594 cdev
= to_ccwdev(dev
);
595 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
596 !ccw_device_is_orphan(cdev
) &&
597 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
598 (cdev
!= d
->sibling
))
603 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
604 struct ccw_device
*sibling
)
607 struct match_data data
;
609 data
.dev_id
= *dev_id
;
610 data
.sibling
= sibling
;
611 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
613 return dev
? to_ccwdev(dev
) : NULL
;
616 static int match_orphan(struct device
*dev
, void *data
)
618 struct ccw_dev_id
*dev_id
;
619 struct ccw_device
*cdev
;
622 cdev
= to_ccwdev(dev
);
623 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
626 static struct ccw_device
*
627 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
628 struct ccw_dev_id
*dev_id
)
632 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
635 return dev
? to_ccwdev(dev
) : NULL
;
639 ccw_device_add_changed(struct work_struct
*work
)
641 struct ccw_device_private
*priv
;
642 struct ccw_device
*cdev
;
644 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
646 if (device_add(&cdev
->dev
)) {
647 put_device(&cdev
->dev
);
650 set_bit(1, &cdev
->private->registered
);
651 if (device_add_files(&cdev
->dev
)) {
652 if (test_and_clear_bit(1, &cdev
->private->registered
))
653 device_unregister(&cdev
->dev
);
657 void ccw_device_do_unreg_rereg(struct work_struct
*work
)
659 struct ccw_device_private
*priv
;
660 struct ccw_device
*cdev
;
661 struct subchannel
*sch
;
663 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
665 sch
= to_subchannel(cdev
->dev
.parent
);
667 device_remove_files(&cdev
->dev
);
668 if (test_and_clear_bit(1, &cdev
->private->registered
))
669 device_del(&cdev
->dev
);
670 PREPARE_WORK(&cdev
->private->kick_work
,
671 ccw_device_add_changed
);
672 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
676 ccw_device_release(struct device
*dev
)
678 struct ccw_device
*cdev
;
680 cdev
= to_ccwdev(dev
);
681 kfree(cdev
->private);
685 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
687 struct ccw_device
*cdev
;
689 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
691 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
692 GFP_KERNEL
| GFP_DMA
);
697 return ERR_PTR(-ENOMEM
);
700 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
701 struct ccw_device
*cdev
)
703 cdev
->private->cdev
= cdev
;
704 atomic_set(&cdev
->private->onoff
, 0);
705 cdev
->dev
.parent
= &sch
->dev
;
706 cdev
->dev
.release
= ccw_device_release
;
707 INIT_LIST_HEAD(&cdev
->private->kick_work
.entry
);
708 /* Do first half of device_register. */
709 device_initialize(&cdev
->dev
);
710 if (!get_device(&sch
->dev
)) {
711 if (cdev
->dev
.release
)
712 cdev
->dev
.release(&cdev
->dev
);
718 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
720 struct ccw_device
*cdev
;
723 cdev
= io_subchannel_allocate_dev(sch
);
725 ret
= io_subchannel_initialize_dev(sch
, cdev
);
734 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
736 static void sch_attach_device(struct subchannel
*sch
,
737 struct ccw_device
*cdev
)
739 spin_lock_irq(sch
->lock
);
740 sch
->dev
.driver_data
= cdev
;
741 cdev
->private->schid
= sch
->schid
;
742 cdev
->ccwlock
= sch
->lock
;
743 device_trigger_reprobe(sch
);
744 spin_unlock_irq(sch
->lock
);
747 static void sch_attach_disconnected_device(struct subchannel
*sch
,
748 struct ccw_device
*cdev
)
750 struct subchannel
*other_sch
;
753 other_sch
= to_subchannel(get_device(cdev
->dev
.parent
));
754 ret
= device_move(&cdev
->dev
, &sch
->dev
);
756 CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
757 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
758 cdev
->private->dev_id
.devno
, ret
);
759 put_device(&other_sch
->dev
);
762 other_sch
->dev
.driver_data
= NULL
;
763 /* No need to keep a subchannel without ccw device around. */
764 css_sch_device_unregister(other_sch
);
765 put_device(&other_sch
->dev
);
766 sch_attach_device(sch
, cdev
);
769 static void sch_attach_orphaned_device(struct subchannel
*sch
,
770 struct ccw_device
*cdev
)
774 /* Try to move the ccw device to its new subchannel. */
775 ret
= device_move(&cdev
->dev
, &sch
->dev
);
777 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
778 "failed (ret=%d)!\n",
779 cdev
->private->dev_id
.ssid
,
780 cdev
->private->dev_id
.devno
, ret
);
783 sch_attach_device(sch
, cdev
);
786 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
788 struct ccw_device
*cdev
;
790 /* Need to allocate a new ccw device. */
791 cdev
= io_subchannel_create_ccwdev(sch
);
793 /* OK, we did everything we could... */
794 css_sch_device_unregister(sch
);
797 spin_lock_irq(sch
->lock
);
798 sch
->dev
.driver_data
= cdev
;
799 spin_unlock_irq(sch
->lock
);
800 /* Start recognition for the new ccw device. */
801 if (io_subchannel_recog(cdev
, sch
)) {
802 spin_lock_irq(sch
->lock
);
803 sch
->dev
.driver_data
= NULL
;
804 spin_unlock_irq(sch
->lock
);
805 if (cdev
->dev
.release
)
806 cdev
->dev
.release(&cdev
->dev
);
807 css_sch_device_unregister(sch
);
812 void ccw_device_move_to_orphanage(struct work_struct
*work
)
814 struct ccw_device_private
*priv
;
815 struct ccw_device
*cdev
;
816 struct ccw_device
*replacing_cdev
;
817 struct subchannel
*sch
;
819 struct channel_subsystem
*css
;
820 struct ccw_dev_id dev_id
;
822 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
824 sch
= to_subchannel(cdev
->dev
.parent
);
825 css
= to_css(sch
->dev
.parent
);
826 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
827 dev_id
.ssid
= sch
->schid
.ssid
;
830 * Move the orphaned ccw device to the orphanage so the replacing
831 * ccw device can take its place on the subchannel.
833 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
);
835 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
836 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
837 cdev
->private->dev_id
.devno
, ret
);
840 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
842 * Search for the replacing ccw device
843 * - among the disconnected devices
846 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
847 if (replacing_cdev
) {
848 sch_attach_disconnected_device(sch
, replacing_cdev
);
851 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
852 if (replacing_cdev
) {
853 sch_attach_orphaned_device(sch
, replacing_cdev
);
856 sch_create_and_recog_new_device(sch
);
860 * Register recognized device.
863 io_subchannel_register(struct work_struct
*work
)
865 struct ccw_device_private
*priv
;
866 struct ccw_device
*cdev
;
867 struct subchannel
*sch
;
871 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
873 sch
= to_subchannel(cdev
->dev
.parent
);
876 * io_subchannel_register() will also be called after device
877 * recognition has been done for a boxed device (which will already
878 * be registered). We need to reprobe since we may now have sense id
881 if (klist_node_attached(&cdev
->dev
.knode_parent
)) {
883 ret
= device_reprobe(&cdev
->dev
);
885 /* We can't do much here. */
886 dev_info(&cdev
->dev
, "device_reprobe() returned"
891 /* make it known to the system */
892 ret
= ccw_device_register(cdev
);
894 printk (KERN_WARNING
"%s: could not register %s\n",
895 __func__
, cdev
->dev
.bus_id
);
896 put_device(&cdev
->dev
);
897 spin_lock_irqsave(sch
->lock
, flags
);
898 sch
->dev
.driver_data
= NULL
;
899 spin_unlock_irqrestore(sch
->lock
, flags
);
900 kfree (cdev
->private);
902 put_device(&sch
->dev
);
903 if (atomic_dec_and_test(&ccw_device_init_count
))
904 wake_up(&ccw_device_init_wq
);
907 put_device(&cdev
->dev
);
909 cdev
->private->flags
.recog_done
= 1;
910 put_device(&sch
->dev
);
911 wake_up(&cdev
->private->wait_q
);
912 if (atomic_dec_and_test(&ccw_device_init_count
))
913 wake_up(&ccw_device_init_wq
);
917 ccw_device_call_sch_unregister(struct work_struct
*work
)
919 struct ccw_device_private
*priv
;
920 struct ccw_device
*cdev
;
921 struct subchannel
*sch
;
923 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
925 sch
= to_subchannel(cdev
->dev
.parent
);
926 css_sch_device_unregister(sch
);
927 /* Reset intparm to zeroes. */
928 sch
->schib
.pmcw
.intparm
= 0;
930 put_device(&cdev
->dev
);
931 put_device(&sch
->dev
);
935 * subchannel recognition done. Called from the state machine.
938 io_subchannel_recog_done(struct ccw_device
*cdev
)
940 struct subchannel
*sch
;
942 if (css_init_done
== 0) {
943 cdev
->private->flags
.recog_done
= 1;
946 switch (cdev
->private->state
) {
947 case DEV_STATE_NOT_OPER
:
948 cdev
->private->flags
.recog_done
= 1;
949 /* Remove device found not operational. */
950 if (!get_device(&cdev
->dev
))
952 sch
= to_subchannel(cdev
->dev
.parent
);
953 PREPARE_WORK(&cdev
->private->kick_work
,
954 ccw_device_call_sch_unregister
);
955 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
956 if (atomic_dec_and_test(&ccw_device_init_count
))
957 wake_up(&ccw_device_init_wq
);
959 case DEV_STATE_BOXED
:
960 /* Device did not respond in time. */
961 case DEV_STATE_OFFLINE
:
963 * We can't register the device in interrupt context so
964 * we schedule a work item.
966 if (!get_device(&cdev
->dev
))
968 PREPARE_WORK(&cdev
->private->kick_work
,
969 io_subchannel_register
);
970 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
976 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
979 struct ccw_device_private
*priv
;
981 sch
->dev
.driver_data
= cdev
;
982 sch
->driver
= &io_subchannel_driver
;
983 cdev
->ccwlock
= sch
->lock
;
985 /* Init private data. */
986 priv
= cdev
->private;
987 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
988 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
989 priv
->schid
= sch
->schid
;
990 priv
->state
= DEV_STATE_NOT_OPER
;
991 INIT_LIST_HEAD(&priv
->cmb_list
);
992 init_waitqueue_head(&priv
->wait_q
);
993 init_timer(&priv
->timer
);
995 /* Set an initial name for the device. */
996 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
997 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
999 /* Increase counter of devices currently in recognition. */
1000 atomic_inc(&ccw_device_init_count
);
1002 /* Start async. device sensing. */
1003 spin_lock_irq(sch
->lock
);
1004 rc
= ccw_device_recognition(cdev
);
1005 spin_unlock_irq(sch
->lock
);
1007 if (atomic_dec_and_test(&ccw_device_init_count
))
1008 wake_up(&ccw_device_init_wq
);
1013 static void ccw_device_move_to_sch(struct work_struct
*work
)
1015 struct ccw_device_private
*priv
;
1017 struct subchannel
*sch
;
1018 struct ccw_device
*cdev
;
1019 struct subchannel
*former_parent
;
1021 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1024 former_parent
= ccw_device_is_orphan(cdev
) ?
1025 NULL
: to_subchannel(get_device(cdev
->dev
.parent
));
1026 mutex_lock(&sch
->reg_mutex
);
1027 /* Try to move the ccw device to its new subchannel. */
1028 rc
= device_move(&cdev
->dev
, &sch
->dev
);
1029 mutex_unlock(&sch
->reg_mutex
);
1031 CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
1032 "0.%x.%04x failed (ret=%d)!\n",
1033 cdev
->private->dev_id
.ssid
,
1034 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1035 sch
->schid
.sch_no
, rc
);
1036 css_sch_device_unregister(sch
);
1039 if (former_parent
) {
1040 spin_lock_irq(former_parent
->lock
);
1041 former_parent
->dev
.driver_data
= NULL
;
1042 spin_unlock_irq(former_parent
->lock
);
1043 css_sch_device_unregister(former_parent
);
1044 /* Reset intparm to zeroes. */
1045 former_parent
->schib
.pmcw
.intparm
= 0;
1046 cio_modify(former_parent
);
1048 sch_attach_device(sch
, cdev
);
1051 put_device(&former_parent
->dev
);
1052 put_device(&cdev
->dev
);
1056 io_subchannel_probe (struct subchannel
*sch
)
1058 struct ccw_device
*cdev
;
1060 unsigned long flags
;
1061 struct ccw_dev_id dev_id
;
1063 if (sch
->dev
.driver_data
) {
1065 * This subchannel already has an associated ccw_device.
1066 * Register it and exit. This happens for all early
1067 * device, e.g. the console.
1069 cdev
= sch
->dev
.driver_data
;
1070 device_initialize(&cdev
->dev
);
1071 ccw_device_register(cdev
);
1073 * Check if the device is already online. If it is
1074 * the reference count needs to be corrected
1075 * (see ccw_device_online and css_init_done for the
1078 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1079 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1080 cdev
->private->state
!= DEV_STATE_BOXED
)
1081 get_device(&cdev
->dev
);
1085 * First check if a fitting device may be found amongst the
1086 * disconnected devices or in the orphanage.
1088 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1089 dev_id
.ssid
= sch
->schid
.ssid
;
1090 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1092 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1096 * Schedule moving the device until when we have a registered
1097 * subchannel to move to and succeed the probe. We can
1098 * unregister later again, when the probe is through.
1100 cdev
->private->sch
= sch
;
1101 PREPARE_WORK(&cdev
->private->kick_work
,
1102 ccw_device_move_to_sch
);
1103 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1106 cdev
= io_subchannel_create_ccwdev(sch
);
1108 return PTR_ERR(cdev
);
1110 rc
= io_subchannel_recog(cdev
, sch
);
1112 spin_lock_irqsave(sch
->lock
, flags
);
1113 sch
->dev
.driver_data
= NULL
;
1114 spin_unlock_irqrestore(sch
->lock
, flags
);
1115 if (cdev
->dev
.release
)
1116 cdev
->dev
.release(&cdev
->dev
);
1123 io_subchannel_remove (struct subchannel
*sch
)
1125 struct ccw_device
*cdev
;
1126 unsigned long flags
;
1128 if (!sch
->dev
.driver_data
)
1130 cdev
= sch
->dev
.driver_data
;
1131 /* Set ccw device to not operational and drop reference. */
1132 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1133 sch
->dev
.driver_data
= NULL
;
1134 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1135 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1137 * Put unregistration on workqueue to avoid livelocks on the css bus
1140 if (get_device(&cdev
->dev
)) {
1141 PREPARE_WORK(&cdev
->private->kick_work
,
1142 ccw_device_unregister
);
1143 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
1149 io_subchannel_notify(struct device
*dev
, int event
)
1151 struct ccw_device
*cdev
;
1153 cdev
= dev
->driver_data
;
1160 return cdev
->drv
->notify
? cdev
->drv
->notify(cdev
, event
) : 0;
1164 io_subchannel_verify(struct device
*dev
)
1166 struct ccw_device
*cdev
;
1168 cdev
= dev
->driver_data
;
1170 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1174 io_subchannel_ioterm(struct device
*dev
)
1176 struct ccw_device
*cdev
;
1178 cdev
= dev
->driver_data
;
1181 /* Internal I/O will be retried by the interrupt handler. */
1182 if (cdev
->private->flags
.intretry
)
1184 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1186 cdev
->handler(cdev
, cdev
->private->intparm
,
1191 io_subchannel_shutdown(struct subchannel
*sch
)
1193 struct ccw_device
*cdev
;
1196 cdev
= sch
->dev
.driver_data
;
1198 if (cio_is_console(sch
->schid
))
1200 if (!sch
->schib
.pmcw
.ena
)
1201 /* Nothing to do. */
1203 ret
= cio_disable_subchannel(sch
);
1205 /* Subchannel is disabled, we're done. */
1207 cdev
->private->state
= DEV_STATE_QUIESCE
;
1209 cdev
->handler(cdev
, cdev
->private->intparm
,
1211 ret
= ccw_device_cancel_halt_clear(cdev
);
1212 if (ret
== -EBUSY
) {
1213 ccw_device_set_timeout(cdev
, HZ
/10);
1214 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1216 cio_disable_subchannel(sch
);
1219 #ifdef CONFIG_CCW_CONSOLE
1220 static struct ccw_device console_cdev
;
1221 static struct ccw_device_private console_private
;
1222 static int console_cdev_in_use
;
1224 static DEFINE_SPINLOCK(ccw_console_lock
);
1226 spinlock_t
* cio_get_console_lock(void)
1228 return &ccw_console_lock
;
1232 ccw_device_console_enable (struct ccw_device
*cdev
, struct subchannel
*sch
)
1236 /* Initialize the ccw_device structure. */
1237 cdev
->dev
.parent
= &sch
->dev
;
1238 rc
= io_subchannel_recog(cdev
, sch
);
1242 /* Now wait for the async. recognition to come to an end. */
1243 spin_lock_irq(cdev
->ccwlock
);
1244 while (!dev_fsm_final_state(cdev
))
1247 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1249 ccw_device_online(cdev
);
1250 while (!dev_fsm_final_state(cdev
))
1252 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1256 spin_unlock_irq(cdev
->ccwlock
);
1261 ccw_device_probe_console(void)
1263 struct subchannel
*sch
;
1266 if (xchg(&console_cdev_in_use
, 1) != 0)
1267 return ERR_PTR(-EBUSY
);
1268 sch
= cio_probe_console();
1270 console_cdev_in_use
= 0;
1271 return (void *) sch
;
1273 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1274 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1275 console_cdev
.private = &console_private
;
1276 console_private
.cdev
= &console_cdev
;
1277 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1279 cio_release_console();
1280 console_cdev_in_use
= 0;
1281 return ERR_PTR(ret
);
1283 console_cdev
.online
= 1;
1284 return &console_cdev
;
1289 * get ccw_device matching the busid, but only if owned by cdrv
1292 __ccwdev_check_busid(struct device
*dev
, void *id
)
1298 return (strncmp(bus_id
, dev
->bus_id
, BUS_ID_SIZE
) == 0);
1303 get_ccwdev_by_busid(struct ccw_driver
*cdrv
, const char *bus_id
)
1306 struct device_driver
*drv
;
1308 drv
= get_driver(&cdrv
->driver
);
1312 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1313 __ccwdev_check_busid
);
1316 return dev
? to_ccwdev(dev
) : NULL
;
1319 /************************** device driver handling ************************/
1321 /* This is the implementation of the ccw_driver class. The probe, remove
1322 * and release methods are initially very similar to the device_driver
1323 * implementations, with the difference that they have ccw_device
1326 * A ccw driver also contains the information that is needed for
1330 ccw_device_probe (struct device
*dev
)
1332 struct ccw_device
*cdev
= to_ccwdev(dev
);
1333 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1336 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1338 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1349 ccw_device_remove (struct device
*dev
)
1351 struct ccw_device
*cdev
= to_ccwdev(dev
);
1352 struct ccw_driver
*cdrv
= cdev
->drv
;
1355 pr_debug("removing device %s\n", cdev
->dev
.bus_id
);
1360 spin_lock_irq(cdev
->ccwlock
);
1361 ret
= ccw_device_offline(cdev
);
1362 spin_unlock_irq(cdev
->ccwlock
);
1364 wait_event(cdev
->private->wait_q
,
1365 dev_fsm_final_state(cdev
));
1367 //FIXME: we can't fail!
1368 pr_debug("ccw_device_offline returned %d, device %s\n",
1369 ret
, cdev
->dev
.bus_id
);
1371 ccw_device_set_timeout(cdev
, 0);
1376 struct bus_type ccw_bus_type
= {
1378 .match
= ccw_bus_match
,
1379 .uevent
= ccw_uevent
,
1380 .probe
= ccw_device_probe
,
1381 .remove
= ccw_device_remove
,
1385 ccw_driver_register (struct ccw_driver
*cdriver
)
1387 struct device_driver
*drv
= &cdriver
->driver
;
1389 drv
->bus
= &ccw_bus_type
;
1390 drv
->name
= cdriver
->name
;
1392 return driver_register(drv
);
1396 ccw_driver_unregister (struct ccw_driver
*cdriver
)
1398 driver_unregister(&cdriver
->driver
);
1401 /* Helper func for qdio. */
1402 struct subchannel_id
1403 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1405 struct subchannel
*sch
;
1407 sch
= to_subchannel(cdev
->dev
.parent
);
1411 MODULE_LICENSE("GPL");
1412 EXPORT_SYMBOL(ccw_device_set_online
);
1413 EXPORT_SYMBOL(ccw_device_set_offline
);
1414 EXPORT_SYMBOL(ccw_driver_register
);
1415 EXPORT_SYMBOL(ccw_driver_unregister
);
1416 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1417 EXPORT_SYMBOL(ccw_bus_type
);
1418 EXPORT_SYMBOL(ccw_device_work
);
1419 EXPORT_SYMBOL(ccw_device_notify_work
);
1420 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);