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
);
123 struct bus_type ccw_bus_type
;
125 static int io_subchannel_probe (struct subchannel
*);
126 static int io_subchannel_remove (struct subchannel
*);
127 static int io_subchannel_notify(struct device
*, int);
128 static void io_subchannel_verify(struct device
*);
129 static void io_subchannel_ioterm(struct device
*);
130 static void io_subchannel_shutdown(struct subchannel
*);
132 static struct css_driver io_subchannel_driver
= {
133 .subchannel_type
= SUBCHANNEL_TYPE_IO
,
135 .name
= "io_subchannel",
136 .bus
= &css_bus_type
,
138 .irq
= io_subchannel_irq
,
139 .notify
= io_subchannel_notify
,
140 .verify
= io_subchannel_verify
,
141 .termination
= io_subchannel_ioterm
,
142 .probe
= io_subchannel_probe
,
143 .remove
= io_subchannel_remove
,
144 .shutdown
= io_subchannel_shutdown
,
147 struct workqueue_struct
*ccw_device_work
;
148 struct workqueue_struct
*ccw_device_notify_work
;
149 wait_queue_head_t ccw_device_init_wq
;
150 atomic_t ccw_device_init_count
;
153 init_ccw_bus_type (void)
157 init_waitqueue_head(&ccw_device_init_wq
);
158 atomic_set(&ccw_device_init_count
, 0);
160 ccw_device_work
= create_singlethread_workqueue("cio");
161 if (!ccw_device_work
)
162 return -ENOMEM
; /* FIXME: better errno ? */
163 ccw_device_notify_work
= create_singlethread_workqueue("cio_notify");
164 if (!ccw_device_notify_work
) {
165 ret
= -ENOMEM
; /* FIXME: better errno ? */
168 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
170 ret
= -ENOMEM
; /* FIXME: better errno ? */
173 if ((ret
= bus_register (&ccw_bus_type
)))
176 if ((ret
= driver_register(&io_subchannel_driver
.drv
)))
179 wait_event(ccw_device_init_wq
,
180 atomic_read(&ccw_device_init_count
) == 0);
181 flush_workqueue(ccw_device_work
);
185 destroy_workqueue(ccw_device_work
);
186 if (ccw_device_notify_work
)
187 destroy_workqueue(ccw_device_notify_work
);
189 destroy_workqueue(slow_path_wq
);
194 cleanup_ccw_bus_type (void)
196 driver_unregister(&io_subchannel_driver
.drv
);
197 bus_unregister(&ccw_bus_type
);
198 destroy_workqueue(ccw_device_notify_work
);
199 destroy_workqueue(ccw_device_work
);
202 subsys_initcall(init_ccw_bus_type
);
203 module_exit(cleanup_ccw_bus_type
);
205 /************************ device handling **************************/
208 * A ccw_device has some interfaces in sysfs in addition to the
210 * The following entries are designed to export the information which
211 * resided in 2.4 in /proc/subchannels. Subchannel and device number
212 * are obvious, so they don't have an entry :)
213 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
216 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
218 struct subchannel
*sch
= to_subchannel(dev
);
219 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
224 for (chp
= 0; chp
< 8; chp
++) {
226 if (ssd
->path_mask
& mask
)
227 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
229 ret
+= sprintf(buf
+ ret
, "00 ");
231 ret
+= sprintf (buf
+ret
, "\n");
232 return min((ssize_t
)PAGE_SIZE
, ret
);
236 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
238 struct subchannel
*sch
= to_subchannel(dev
);
239 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
241 return sprintf (buf
, "%02x %02x %02x\n",
242 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
246 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
248 struct ccw_device
*cdev
= to_ccwdev(dev
);
249 struct ccw_device_id
*id
= &(cdev
->id
);
251 if (id
->dev_type
!= 0)
252 return sprintf(buf
, "%04x/%02x\n",
253 id
->dev_type
, id
->dev_model
);
255 return sprintf(buf
, "n/a\n");
259 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
261 struct ccw_device
*cdev
= to_ccwdev(dev
);
262 struct ccw_device_id
*id
= &(cdev
->id
);
264 return sprintf(buf
, "%04x/%02x\n",
265 id
->cu_type
, id
->cu_model
);
269 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
271 struct ccw_device
*cdev
= to_ccwdev(dev
);
272 struct ccw_device_id
*id
= &(cdev
->id
);
275 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
277 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
281 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
283 struct ccw_device
*cdev
= to_ccwdev(dev
);
285 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
288 int ccw_device_is_orphan(struct ccw_device
*cdev
)
290 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
293 static void ccw_device_unregister(struct ccw_device
*cdev
)
295 if (test_and_clear_bit(1, &cdev
->private->registered
))
296 device_del(&cdev
->dev
);
299 static void ccw_device_remove_orphan_cb(struct device
*dev
)
301 struct ccw_device
*cdev
= to_ccwdev(dev
);
303 ccw_device_unregister(cdev
);
304 put_device(&cdev
->dev
);
307 static void ccw_device_remove_sch_cb(struct device
*dev
)
309 struct subchannel
*sch
;
311 sch
= to_subchannel(dev
);
312 css_sch_device_unregister(sch
);
313 /* Reset intparm to zeroes. */
314 sch
->schib
.pmcw
.intparm
= 0;
316 put_device(&sch
->dev
);
320 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
326 * Forced offline in disconnected state means
327 * 'throw away device'.
329 if (ccw_device_is_orphan(cdev
)) {
331 * Deregister ccw device.
332 * Unfortunately, we cannot do this directly from the
335 spin_lock_irqsave(cdev
->ccwlock
, flags
);
336 cdev
->private->state
= DEV_STATE_NOT_OPER
;
337 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
338 rc
= device_schedule_callback(&cdev
->dev
,
339 ccw_device_remove_orphan_cb
);
341 CIO_MSG_EVENT(2, "Couldn't unregister orphan "
343 cdev
->private->dev_id
.ssid
,
344 cdev
->private->dev_id
.devno
);
347 /* Deregister subchannel, which will kill the ccw device. */
348 rc
= device_schedule_callback(cdev
->dev
.parent
,
349 ccw_device_remove_sch_cb
);
351 CIO_MSG_EVENT(2, "Couldn't unregister disconnected device "
353 cdev
->private->dev_id
.ssid
,
354 cdev
->private->dev_id
.devno
);
358 ccw_device_set_offline(struct ccw_device
*cdev
)
364 if (!cdev
->online
|| !cdev
->drv
)
367 if (cdev
->drv
->set_offline
) {
368 ret
= cdev
->drv
->set_offline(cdev
);
373 spin_lock_irq(cdev
->ccwlock
);
374 ret
= ccw_device_offline(cdev
);
375 if (ret
== -ENODEV
) {
376 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
377 cdev
->private->state
= DEV_STATE_OFFLINE
;
378 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
380 spin_unlock_irq(cdev
->ccwlock
);
383 spin_unlock_irq(cdev
->ccwlock
);
385 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
387 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
388 "device 0.%x.%04x\n",
389 ret
, cdev
->private->dev_id
.ssid
,
390 cdev
->private->dev_id
.devno
);
397 ccw_device_set_online(struct ccw_device
*cdev
)
403 if (cdev
->online
|| !cdev
->drv
)
406 spin_lock_irq(cdev
->ccwlock
);
407 ret
= ccw_device_online(cdev
);
408 spin_unlock_irq(cdev
->ccwlock
);
410 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
412 CIO_MSG_EVENT(2, "ccw_device_online returned %d, "
413 "device 0.%x.%04x\n",
414 ret
, cdev
->private->dev_id
.ssid
,
415 cdev
->private->dev_id
.devno
);
418 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
420 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
424 spin_lock_irq(cdev
->ccwlock
);
425 ret
= ccw_device_offline(cdev
);
426 spin_unlock_irq(cdev
->ccwlock
);
428 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
430 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
431 "device 0.%x.%04x\n",
432 ret
, cdev
->private->dev_id
.ssid
,
433 cdev
->private->dev_id
.devno
);
434 return (ret
== 0) ? -ENODEV
: ret
;
437 static void online_store_handle_offline(struct ccw_device
*cdev
)
439 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
440 ccw_device_remove_disconnected(cdev
);
441 else if (cdev
->drv
&& cdev
->drv
->set_offline
)
442 ccw_device_set_offline(cdev
);
445 static int online_store_recog_and_online(struct ccw_device
*cdev
)
449 /* Do device recognition, if needed. */
450 if (cdev
->id
.cu_type
== 0) {
451 ret
= ccw_device_recognition(cdev
);
453 CIO_MSG_EVENT(0, "Couldn't start recognition "
454 "for device 0.%x.%04x (ret=%d)\n",
455 cdev
->private->dev_id
.ssid
,
456 cdev
->private->dev_id
.devno
, ret
);
459 wait_event(cdev
->private->wait_q
,
460 cdev
->private->flags
.recog_done
);
462 if (cdev
->drv
&& cdev
->drv
->set_online
)
463 ccw_device_set_online(cdev
);
466 static void online_store_handle_online(struct ccw_device
*cdev
, int force
)
470 ret
= online_store_recog_and_online(cdev
);
473 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
474 ret
= ccw_device_stlck(cdev
);
477 "ccw_device_stlck returned %d!\n", ret
);
480 if (cdev
->id
.cu_type
== 0)
481 cdev
->private->state
= DEV_STATE_NOT_OPER
;
482 online_store_recog_and_online(cdev
);
487 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
488 const char *buf
, size_t count
)
490 struct ccw_device
*cdev
= to_ccwdev(dev
);
494 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
497 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
498 atomic_set(&cdev
->private->onoff
, 0);
501 if (!strncmp(buf
, "force\n", count
)) {
506 i
= simple_strtoul(buf
, &tmp
, 16);
511 online_store_handle_offline(cdev
);
514 online_store_handle_online(cdev
, force
);
520 module_put(cdev
->drv
->owner
);
521 atomic_set(&cdev
->private->onoff
, 0);
526 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
528 struct ccw_device
*cdev
= to_ccwdev(dev
);
529 struct subchannel
*sch
;
531 if (ccw_device_is_orphan(cdev
))
532 return sprintf(buf
, "no device\n");
533 switch (cdev
->private->state
) {
534 case DEV_STATE_BOXED
:
535 return sprintf(buf
, "boxed\n");
536 case DEV_STATE_DISCONNECTED
:
537 case DEV_STATE_DISCONNECTED_SENSE_ID
:
538 case DEV_STATE_NOT_OPER
:
539 sch
= to_subchannel(dev
->parent
);
541 return sprintf(buf
, "no path\n");
543 return sprintf(buf
, "no device\n");
545 /* All other states considered fine. */
546 return sprintf(buf
, "good\n");
550 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
551 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
552 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
553 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
554 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
555 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
556 extern struct device_attribute dev_attr_cmb_enable
;
557 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
559 static struct attribute
* subch_attrs
[] = {
560 &dev_attr_chpids
.attr
,
561 &dev_attr_pimpampom
.attr
,
565 static struct attribute_group subch_attr_group
= {
566 .attrs
= subch_attrs
,
569 struct attribute_group
*subch_attr_groups
[] = {
574 static struct attribute
* ccwdev_attrs
[] = {
575 &dev_attr_devtype
.attr
,
576 &dev_attr_cutype
.attr
,
577 &dev_attr_modalias
.attr
,
578 &dev_attr_online
.attr
,
579 &dev_attr_cmb_enable
.attr
,
580 &dev_attr_availability
.attr
,
584 static struct attribute_group ccwdev_attr_group
= {
585 .attrs
= ccwdev_attrs
,
588 static struct attribute_group
*ccwdev_attr_groups
[] = {
593 /* this is a simple abstraction for device_register that sets the
594 * correct bus type and adds the bus specific files */
595 static int ccw_device_register(struct ccw_device
*cdev
)
597 struct device
*dev
= &cdev
->dev
;
600 dev
->bus
= &ccw_bus_type
;
602 if ((ret
= device_add(dev
)))
605 set_bit(1, &cdev
->private->registered
);
610 struct ccw_dev_id dev_id
;
611 struct ccw_device
* sibling
;
615 match_devno(struct device
* dev
, void * data
)
617 struct match_data
* d
= data
;
618 struct ccw_device
* cdev
;
620 cdev
= to_ccwdev(dev
);
621 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
622 !ccw_device_is_orphan(cdev
) &&
623 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
624 (cdev
!= d
->sibling
))
629 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
630 struct ccw_device
*sibling
)
633 struct match_data data
;
635 data
.dev_id
= *dev_id
;
636 data
.sibling
= sibling
;
637 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
639 return dev
? to_ccwdev(dev
) : NULL
;
642 static int match_orphan(struct device
*dev
, void *data
)
644 struct ccw_dev_id
*dev_id
;
645 struct ccw_device
*cdev
;
648 cdev
= to_ccwdev(dev
);
649 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
652 static struct ccw_device
*
653 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
654 struct ccw_dev_id
*dev_id
)
658 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
661 return dev
? to_ccwdev(dev
) : NULL
;
665 ccw_device_add_changed(struct work_struct
*work
)
667 struct ccw_device_private
*priv
;
668 struct ccw_device
*cdev
;
670 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
672 if (device_add(&cdev
->dev
)) {
673 put_device(&cdev
->dev
);
676 set_bit(1, &cdev
->private->registered
);
679 void ccw_device_do_unreg_rereg(struct work_struct
*work
)
681 struct ccw_device_private
*priv
;
682 struct ccw_device
*cdev
;
683 struct subchannel
*sch
;
685 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
687 sch
= to_subchannel(cdev
->dev
.parent
);
689 ccw_device_unregister(cdev
);
690 PREPARE_WORK(&cdev
->private->kick_work
,
691 ccw_device_add_changed
);
692 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
696 ccw_device_release(struct device
*dev
)
698 struct ccw_device
*cdev
;
700 cdev
= to_ccwdev(dev
);
701 kfree(cdev
->private);
705 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
707 struct ccw_device
*cdev
;
709 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
711 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
712 GFP_KERNEL
| GFP_DMA
);
717 return ERR_PTR(-ENOMEM
);
720 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
721 struct ccw_device
*cdev
)
723 cdev
->private->cdev
= cdev
;
724 atomic_set(&cdev
->private->onoff
, 0);
725 cdev
->dev
.parent
= &sch
->dev
;
726 cdev
->dev
.release
= ccw_device_release
;
727 INIT_LIST_HEAD(&cdev
->private->kick_work
.entry
);
728 cdev
->dev
.groups
= ccwdev_attr_groups
;
729 /* Do first half of device_register. */
730 device_initialize(&cdev
->dev
);
731 if (!get_device(&sch
->dev
)) {
732 if (cdev
->dev
.release
)
733 cdev
->dev
.release(&cdev
->dev
);
739 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
741 struct ccw_device
*cdev
;
744 cdev
= io_subchannel_allocate_dev(sch
);
746 ret
= io_subchannel_initialize_dev(sch
, cdev
);
755 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
757 static void sch_attach_device(struct subchannel
*sch
,
758 struct ccw_device
*cdev
)
760 css_update_ssd_info(sch
);
761 spin_lock_irq(sch
->lock
);
762 sch
->dev
.driver_data
= cdev
;
763 cdev
->private->schid
= sch
->schid
;
764 cdev
->ccwlock
= sch
->lock
;
765 device_trigger_reprobe(sch
);
766 spin_unlock_irq(sch
->lock
);
769 static void sch_attach_disconnected_device(struct subchannel
*sch
,
770 struct ccw_device
*cdev
)
772 struct subchannel
*other_sch
;
775 other_sch
= to_subchannel(get_device(cdev
->dev
.parent
));
776 ret
= device_move(&cdev
->dev
, &sch
->dev
);
778 CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
779 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
780 cdev
->private->dev_id
.devno
, ret
);
781 put_device(&other_sch
->dev
);
784 other_sch
->dev
.driver_data
= NULL
;
785 /* No need to keep a subchannel without ccw device around. */
786 css_sch_device_unregister(other_sch
);
787 put_device(&other_sch
->dev
);
788 sch_attach_device(sch
, cdev
);
791 static void sch_attach_orphaned_device(struct subchannel
*sch
,
792 struct ccw_device
*cdev
)
796 /* Try to move the ccw device to its new subchannel. */
797 ret
= device_move(&cdev
->dev
, &sch
->dev
);
799 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
800 "failed (ret=%d)!\n",
801 cdev
->private->dev_id
.ssid
,
802 cdev
->private->dev_id
.devno
, ret
);
805 sch_attach_device(sch
, cdev
);
808 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
810 struct ccw_device
*cdev
;
812 /* Need to allocate a new ccw device. */
813 cdev
= io_subchannel_create_ccwdev(sch
);
815 /* OK, we did everything we could... */
816 css_sch_device_unregister(sch
);
819 spin_lock_irq(sch
->lock
);
820 sch
->dev
.driver_data
= cdev
;
821 spin_unlock_irq(sch
->lock
);
822 /* Start recognition for the new ccw device. */
823 if (io_subchannel_recog(cdev
, sch
)) {
824 spin_lock_irq(sch
->lock
);
825 sch
->dev
.driver_data
= NULL
;
826 spin_unlock_irq(sch
->lock
);
827 if (cdev
->dev
.release
)
828 cdev
->dev
.release(&cdev
->dev
);
829 css_sch_device_unregister(sch
);
834 void ccw_device_move_to_orphanage(struct work_struct
*work
)
836 struct ccw_device_private
*priv
;
837 struct ccw_device
*cdev
;
838 struct ccw_device
*replacing_cdev
;
839 struct subchannel
*sch
;
841 struct channel_subsystem
*css
;
842 struct ccw_dev_id dev_id
;
844 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
846 sch
= to_subchannel(cdev
->dev
.parent
);
847 css
= to_css(sch
->dev
.parent
);
848 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
849 dev_id
.ssid
= sch
->schid
.ssid
;
852 * Move the orphaned ccw device to the orphanage so the replacing
853 * ccw device can take its place on the subchannel.
855 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
);
857 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
858 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
859 cdev
->private->dev_id
.devno
, ret
);
862 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
864 * Search for the replacing ccw device
865 * - among the disconnected devices
868 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
869 if (replacing_cdev
) {
870 sch_attach_disconnected_device(sch
, replacing_cdev
);
873 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
874 if (replacing_cdev
) {
875 sch_attach_orphaned_device(sch
, replacing_cdev
);
878 sch_create_and_recog_new_device(sch
);
882 * Register recognized device.
885 io_subchannel_register(struct work_struct
*work
)
887 struct ccw_device_private
*priv
;
888 struct ccw_device
*cdev
;
889 struct subchannel
*sch
;
893 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
895 sch
= to_subchannel(cdev
->dev
.parent
);
896 css_update_ssd_info(sch
);
898 * io_subchannel_register() will also be called after device
899 * recognition has been done for a boxed device (which will already
900 * be registered). We need to reprobe since we may now have sense id
903 if (klist_node_attached(&cdev
->dev
.knode_parent
)) {
905 ret
= device_reprobe(&cdev
->dev
);
907 /* We can't do much here. */
908 CIO_MSG_EVENT(2, "device_reprobe() returned"
909 " %d for 0.%x.%04x\n", ret
,
910 cdev
->private->dev_id
.ssid
,
911 cdev
->private->dev_id
.devno
);
916 * Now we know this subchannel will stay, we can throw
917 * our delayed uevent.
919 sch
->dev
.uevent_suppress
= 0;
920 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
921 /* make it known to the system */
922 ret
= ccw_device_register(cdev
);
924 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
925 cdev
->private->dev_id
.ssid
,
926 cdev
->private->dev_id
.devno
, ret
);
927 put_device(&cdev
->dev
);
928 spin_lock_irqsave(sch
->lock
, flags
);
929 sch
->dev
.driver_data
= NULL
;
930 spin_unlock_irqrestore(sch
->lock
, flags
);
931 kfree (cdev
->private);
933 put_device(&sch
->dev
);
934 if (atomic_dec_and_test(&ccw_device_init_count
))
935 wake_up(&ccw_device_init_wq
);
938 put_device(&cdev
->dev
);
940 cdev
->private->flags
.recog_done
= 1;
941 put_device(&sch
->dev
);
942 wake_up(&cdev
->private->wait_q
);
943 if (atomic_dec_and_test(&ccw_device_init_count
))
944 wake_up(&ccw_device_init_wq
);
948 ccw_device_call_sch_unregister(struct work_struct
*work
)
950 struct ccw_device_private
*priv
;
951 struct ccw_device
*cdev
;
952 struct subchannel
*sch
;
954 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
956 sch
= to_subchannel(cdev
->dev
.parent
);
957 css_sch_device_unregister(sch
);
958 /* Reset intparm to zeroes. */
959 sch
->schib
.pmcw
.intparm
= 0;
961 put_device(&cdev
->dev
);
962 put_device(&sch
->dev
);
966 * subchannel recognition done. Called from the state machine.
969 io_subchannel_recog_done(struct ccw_device
*cdev
)
971 struct subchannel
*sch
;
973 if (css_init_done
== 0) {
974 cdev
->private->flags
.recog_done
= 1;
977 switch (cdev
->private->state
) {
978 case DEV_STATE_NOT_OPER
:
979 cdev
->private->flags
.recog_done
= 1;
980 /* Remove device found not operational. */
981 if (!get_device(&cdev
->dev
))
983 sch
= to_subchannel(cdev
->dev
.parent
);
984 PREPARE_WORK(&cdev
->private->kick_work
,
985 ccw_device_call_sch_unregister
);
986 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
987 if (atomic_dec_and_test(&ccw_device_init_count
))
988 wake_up(&ccw_device_init_wq
);
990 case DEV_STATE_BOXED
:
991 /* Device did not respond in time. */
992 case DEV_STATE_OFFLINE
:
994 * We can't register the device in interrupt context so
995 * we schedule a work item.
997 if (!get_device(&cdev
->dev
))
999 PREPARE_WORK(&cdev
->private->kick_work
,
1000 io_subchannel_register
);
1001 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1007 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
1010 struct ccw_device_private
*priv
;
1012 sch
->dev
.driver_data
= cdev
;
1013 sch
->driver
= &io_subchannel_driver
;
1014 cdev
->ccwlock
= sch
->lock
;
1016 /* Init private data. */
1017 priv
= cdev
->private;
1018 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1019 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
1020 priv
->schid
= sch
->schid
;
1021 priv
->state
= DEV_STATE_NOT_OPER
;
1022 INIT_LIST_HEAD(&priv
->cmb_list
);
1023 init_waitqueue_head(&priv
->wait_q
);
1024 init_timer(&priv
->timer
);
1026 /* Set an initial name for the device. */
1027 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
1028 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1030 /* Increase counter of devices currently in recognition. */
1031 atomic_inc(&ccw_device_init_count
);
1033 /* Start async. device sensing. */
1034 spin_lock_irq(sch
->lock
);
1035 rc
= ccw_device_recognition(cdev
);
1036 spin_unlock_irq(sch
->lock
);
1038 if (atomic_dec_and_test(&ccw_device_init_count
))
1039 wake_up(&ccw_device_init_wq
);
1044 static void ccw_device_move_to_sch(struct work_struct
*work
)
1046 struct ccw_device_private
*priv
;
1048 struct subchannel
*sch
;
1049 struct ccw_device
*cdev
;
1050 struct subchannel
*former_parent
;
1052 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1055 former_parent
= ccw_device_is_orphan(cdev
) ?
1056 NULL
: to_subchannel(get_device(cdev
->dev
.parent
));
1057 mutex_lock(&sch
->reg_mutex
);
1058 /* Try to move the ccw device to its new subchannel. */
1059 rc
= device_move(&cdev
->dev
, &sch
->dev
);
1060 mutex_unlock(&sch
->reg_mutex
);
1062 CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
1063 "0.%x.%04x failed (ret=%d)!\n",
1064 cdev
->private->dev_id
.ssid
,
1065 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1066 sch
->schid
.sch_no
, rc
);
1067 css_sch_device_unregister(sch
);
1070 if (former_parent
) {
1071 spin_lock_irq(former_parent
->lock
);
1072 former_parent
->dev
.driver_data
= NULL
;
1073 spin_unlock_irq(former_parent
->lock
);
1074 css_sch_device_unregister(former_parent
);
1075 /* Reset intparm to zeroes. */
1076 former_parent
->schib
.pmcw
.intparm
= 0;
1077 cio_modify(former_parent
);
1079 sch_attach_device(sch
, cdev
);
1082 put_device(&former_parent
->dev
);
1083 put_device(&cdev
->dev
);
1087 io_subchannel_probe (struct subchannel
*sch
)
1089 struct ccw_device
*cdev
;
1091 unsigned long flags
;
1092 struct ccw_dev_id dev_id
;
1094 if (sch
->dev
.driver_data
) {
1096 * This subchannel already has an associated ccw_device.
1097 * Register it and exit. This happens for all early
1098 * device, e.g. the console.
1100 cdev
= sch
->dev
.driver_data
;
1101 device_initialize(&cdev
->dev
);
1102 ccw_device_register(cdev
);
1104 * Check if the device is already online. If it is
1105 * the reference count needs to be corrected
1106 * (see ccw_device_online and css_init_done for the
1109 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1110 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1111 cdev
->private->state
!= DEV_STATE_BOXED
)
1112 get_device(&cdev
->dev
);
1116 * First check if a fitting device may be found amongst the
1117 * disconnected devices or in the orphanage.
1119 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1120 dev_id
.ssid
= sch
->schid
.ssid
;
1121 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1123 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1127 * Schedule moving the device until when we have a registered
1128 * subchannel to move to and succeed the probe. We can
1129 * unregister later again, when the probe is through.
1131 cdev
->private->sch
= sch
;
1132 PREPARE_WORK(&cdev
->private->kick_work
,
1133 ccw_device_move_to_sch
);
1134 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1137 cdev
= io_subchannel_create_ccwdev(sch
);
1139 return PTR_ERR(cdev
);
1141 rc
= io_subchannel_recog(cdev
, sch
);
1143 spin_lock_irqsave(sch
->lock
, flags
);
1144 sch
->dev
.driver_data
= NULL
;
1145 spin_unlock_irqrestore(sch
->lock
, flags
);
1146 if (cdev
->dev
.release
)
1147 cdev
->dev
.release(&cdev
->dev
);
1154 io_subchannel_remove (struct subchannel
*sch
)
1156 struct ccw_device
*cdev
;
1157 unsigned long flags
;
1159 if (!sch
->dev
.driver_data
)
1161 cdev
= sch
->dev
.driver_data
;
1162 /* Set ccw device to not operational and drop reference. */
1163 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1164 sch
->dev
.driver_data
= NULL
;
1165 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1166 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1167 ccw_device_unregister(cdev
);
1168 put_device(&cdev
->dev
);
1173 io_subchannel_notify(struct device
*dev
, int event
)
1175 struct ccw_device
*cdev
;
1177 cdev
= dev
->driver_data
;
1184 return cdev
->drv
->notify
? cdev
->drv
->notify(cdev
, event
) : 0;
1188 io_subchannel_verify(struct device
*dev
)
1190 struct ccw_device
*cdev
;
1192 cdev
= dev
->driver_data
;
1194 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1198 io_subchannel_ioterm(struct device
*dev
)
1200 struct ccw_device
*cdev
;
1202 cdev
= dev
->driver_data
;
1205 /* Internal I/O will be retried by the interrupt handler. */
1206 if (cdev
->private->flags
.intretry
)
1208 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1210 cdev
->handler(cdev
, cdev
->private->intparm
,
1215 io_subchannel_shutdown(struct subchannel
*sch
)
1217 struct ccw_device
*cdev
;
1220 cdev
= sch
->dev
.driver_data
;
1222 if (cio_is_console(sch
->schid
))
1224 if (!sch
->schib
.pmcw
.ena
)
1225 /* Nothing to do. */
1227 ret
= cio_disable_subchannel(sch
);
1229 /* Subchannel is disabled, we're done. */
1231 cdev
->private->state
= DEV_STATE_QUIESCE
;
1233 cdev
->handler(cdev
, cdev
->private->intparm
,
1235 ret
= ccw_device_cancel_halt_clear(cdev
);
1236 if (ret
== -EBUSY
) {
1237 ccw_device_set_timeout(cdev
, HZ
/10);
1238 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1240 cio_disable_subchannel(sch
);
1243 #ifdef CONFIG_CCW_CONSOLE
1244 static struct ccw_device console_cdev
;
1245 static struct ccw_device_private console_private
;
1246 static int console_cdev_in_use
;
1248 static DEFINE_SPINLOCK(ccw_console_lock
);
1250 spinlock_t
* cio_get_console_lock(void)
1252 return &ccw_console_lock
;
1256 ccw_device_console_enable (struct ccw_device
*cdev
, struct subchannel
*sch
)
1260 /* Initialize the ccw_device structure. */
1261 cdev
->dev
.parent
= &sch
->dev
;
1262 rc
= io_subchannel_recog(cdev
, sch
);
1266 /* Now wait for the async. recognition to come to an end. */
1267 spin_lock_irq(cdev
->ccwlock
);
1268 while (!dev_fsm_final_state(cdev
))
1271 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1273 ccw_device_online(cdev
);
1274 while (!dev_fsm_final_state(cdev
))
1276 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1280 spin_unlock_irq(cdev
->ccwlock
);
1285 ccw_device_probe_console(void)
1287 struct subchannel
*sch
;
1290 if (xchg(&console_cdev_in_use
, 1) != 0)
1291 return ERR_PTR(-EBUSY
);
1292 sch
= cio_probe_console();
1294 console_cdev_in_use
= 0;
1295 return (void *) sch
;
1297 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1298 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1299 console_cdev
.private = &console_private
;
1300 console_private
.cdev
= &console_cdev
;
1301 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1303 cio_release_console();
1304 console_cdev_in_use
= 0;
1305 return ERR_PTR(ret
);
1307 console_cdev
.online
= 1;
1308 return &console_cdev
;
1313 * get ccw_device matching the busid, but only if owned by cdrv
1316 __ccwdev_check_busid(struct device
*dev
, void *id
)
1322 return (strncmp(bus_id
, dev
->bus_id
, BUS_ID_SIZE
) == 0);
1327 get_ccwdev_by_busid(struct ccw_driver
*cdrv
, const char *bus_id
)
1330 struct device_driver
*drv
;
1332 drv
= get_driver(&cdrv
->driver
);
1336 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1337 __ccwdev_check_busid
);
1340 return dev
? to_ccwdev(dev
) : NULL
;
1343 /************************** device driver handling ************************/
1345 /* This is the implementation of the ccw_driver class. The probe, remove
1346 * and release methods are initially very similar to the device_driver
1347 * implementations, with the difference that they have ccw_device
1350 * A ccw driver also contains the information that is needed for
1354 ccw_device_probe (struct device
*dev
)
1356 struct ccw_device
*cdev
= to_ccwdev(dev
);
1357 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1360 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1362 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1373 ccw_device_remove (struct device
*dev
)
1375 struct ccw_device
*cdev
= to_ccwdev(dev
);
1376 struct ccw_driver
*cdrv
= cdev
->drv
;
1383 spin_lock_irq(cdev
->ccwlock
);
1384 ret
= ccw_device_offline(cdev
);
1385 spin_unlock_irq(cdev
->ccwlock
);
1387 wait_event(cdev
->private->wait_q
,
1388 dev_fsm_final_state(cdev
));
1390 //FIXME: we can't fail!
1391 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
1392 "device 0.%x.%04x\n",
1393 ret
, cdev
->private->dev_id
.ssid
,
1394 cdev
->private->dev_id
.devno
);
1396 ccw_device_set_timeout(cdev
, 0);
1401 struct bus_type ccw_bus_type
= {
1403 .match
= ccw_bus_match
,
1404 .uevent
= ccw_uevent
,
1405 .probe
= ccw_device_probe
,
1406 .remove
= ccw_device_remove
,
1410 ccw_driver_register (struct ccw_driver
*cdriver
)
1412 struct device_driver
*drv
= &cdriver
->driver
;
1414 drv
->bus
= &ccw_bus_type
;
1415 drv
->name
= cdriver
->name
;
1417 return driver_register(drv
);
1421 ccw_driver_unregister (struct ccw_driver
*cdriver
)
1423 driver_unregister(&cdriver
->driver
);
1426 /* Helper func for qdio. */
1427 struct subchannel_id
1428 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1430 struct subchannel
*sch
;
1432 sch
= to_subchannel(cdev
->dev
.parent
);
1436 MODULE_LICENSE("GPL");
1437 EXPORT_SYMBOL(ccw_device_set_online
);
1438 EXPORT_SYMBOL(ccw_device_set_offline
);
1439 EXPORT_SYMBOL(ccw_driver_register
);
1440 EXPORT_SYMBOL(ccw_driver_unregister
);
1441 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1442 EXPORT_SYMBOL(ccw_bus_type
);
1443 EXPORT_SYMBOL(ccw_device_work
);
1444 EXPORT_SYMBOL(ccw_device_notify_work
);
1445 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);