2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
6 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
8 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
9 * Cornelia Huck (cohuck@de.ibm.com)
10 * Martin Schwidefsky (schwidefsky@de.ibm.com)
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/spinlock.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/slab.h>
19 #include <linux/list.h>
20 #include <linux/device.h>
21 #include <linux/workqueue.h>
23 #include <asm/ccwdev.h>
25 #include <asm/param.h> /* HZ */
32 /******************* bus type handling ***********************/
34 /* The Linux driver model distinguishes between a bus type and
35 * the bus itself. Of course we only have one channel
36 * subsystem driver and one channel system per machine, but
37 * we still use the abstraction. T.R. says it's a good idea. */
39 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
41 struct ccw_device
*cdev
= to_ccwdev(dev
);
42 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
43 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
48 found
= ccw_device_id_match(ids
, &cdev
->id
);
52 cdev
->id
.driver_info
= found
->driver_info
;
58 * Hotplugging interface for ccw devices.
59 * Heavily modeled on pci and usb hotplug.
62 ccw_uevent (struct device
*dev
, char **envp
, int num_envp
,
63 char *buffer
, int buffer_size
)
65 struct ccw_device
*cdev
= to_ccwdev(dev
);
72 /* what we want to pass to /sbin/hotplug */
75 length
+= scnprintf(buffer
, buffer_size
- length
, "CU_TYPE=%04X",
77 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
83 length
+= scnprintf(buffer
, buffer_size
- length
, "CU_MODEL=%02X",
85 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
90 /* The next two can be zero, that's ok for us */
92 length
+= scnprintf(buffer
, buffer_size
- length
, "DEV_TYPE=%04X",
94 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
100 length
+= scnprintf(buffer
, buffer_size
- length
, "DEV_MODEL=%02X",
102 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
110 struct bus_type ccw_bus_type
= {
112 .match
= &ccw_bus_match
,
113 .uevent
= &ccw_uevent
,
116 static int io_subchannel_probe (struct device
*);
117 static int io_subchannel_remove (struct device
*);
118 void io_subchannel_irq (struct device
*);
119 static int io_subchannel_notify(struct device
*, int);
120 static void io_subchannel_verify(struct device
*);
121 static void io_subchannel_ioterm(struct device
*);
122 static void io_subchannel_shutdown(struct device
*);
124 struct css_driver io_subchannel_driver
= {
125 .subchannel_type
= SUBCHANNEL_TYPE_IO
,
127 .name
= "io_subchannel",
128 .bus
= &css_bus_type
,
129 .probe
= &io_subchannel_probe
,
130 .remove
= &io_subchannel_remove
,
131 .shutdown
= &io_subchannel_shutdown
,
133 .irq
= io_subchannel_irq
,
134 .notify
= io_subchannel_notify
,
135 .verify
= io_subchannel_verify
,
136 .termination
= io_subchannel_ioterm
,
139 struct workqueue_struct
*ccw_device_work
;
140 struct workqueue_struct
*ccw_device_notify_work
;
141 static wait_queue_head_t ccw_device_init_wq
;
142 static atomic_t ccw_device_init_count
;
145 init_ccw_bus_type (void)
149 init_waitqueue_head(&ccw_device_init_wq
);
150 atomic_set(&ccw_device_init_count
, 0);
152 ccw_device_work
= create_singlethread_workqueue("cio");
153 if (!ccw_device_work
)
154 return -ENOMEM
; /* FIXME: better errno ? */
155 ccw_device_notify_work
= create_singlethread_workqueue("cio_notify");
156 if (!ccw_device_notify_work
) {
157 ret
= -ENOMEM
; /* FIXME: better errno ? */
160 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
162 ret
= -ENOMEM
; /* FIXME: better errno ? */
165 if ((ret
= bus_register (&ccw_bus_type
)))
168 if ((ret
= driver_register(&io_subchannel_driver
.drv
)))
171 wait_event(ccw_device_init_wq
,
172 atomic_read(&ccw_device_init_count
) == 0);
173 flush_workqueue(ccw_device_work
);
177 destroy_workqueue(ccw_device_work
);
178 if (ccw_device_notify_work
)
179 destroy_workqueue(ccw_device_notify_work
);
181 destroy_workqueue(slow_path_wq
);
186 cleanup_ccw_bus_type (void)
188 driver_unregister(&io_subchannel_driver
.drv
);
189 bus_unregister(&ccw_bus_type
);
190 destroy_workqueue(ccw_device_notify_work
);
191 destroy_workqueue(ccw_device_work
);
194 subsys_initcall(init_ccw_bus_type
);
195 module_exit(cleanup_ccw_bus_type
);
197 /************************ device handling **************************/
200 * A ccw_device has some interfaces in sysfs in addition to the
202 * The following entries are designed to export the information which
203 * resided in 2.4 in /proc/subchannels. Subchannel and device number
204 * are obvious, so they don't have an entry :)
205 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
208 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
210 struct subchannel
*sch
= to_subchannel(dev
);
211 struct ssd_info
*ssd
= &sch
->ssd_info
;
215 for (chp
= 0; chp
< 8; chp
++)
216 ret
+= sprintf (buf
+ret
, "%02x ", ssd
->chpid
[chp
]);
218 ret
+= sprintf (buf
+ret
, "\n");
219 return min((ssize_t
)PAGE_SIZE
, ret
);
223 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
225 struct subchannel
*sch
= to_subchannel(dev
);
226 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
228 return sprintf (buf
, "%02x %02x %02x\n",
229 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
233 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
235 struct ccw_device
*cdev
= to_ccwdev(dev
);
236 struct ccw_device_id
*id
= &(cdev
->id
);
238 if (id
->dev_type
!= 0)
239 return sprintf(buf
, "%04x/%02x\n",
240 id
->dev_type
, id
->dev_model
);
242 return sprintf(buf
, "n/a\n");
246 cutype_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 return sprintf(buf
, "%04x/%02x\n",
252 id
->cu_type
, id
->cu_model
);
256 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
258 struct ccw_device
*cdev
= to_ccwdev(dev
);
259 struct ccw_device_id
*id
= &(cdev
->id
);
262 ret
= sprintf(buf
, "ccw:t%04Xm%02x",
263 id
->cu_type
, id
->cu_model
);
264 if (id
->dev_type
!= 0)
265 ret
+= sprintf(buf
+ ret
, "dt%04Xdm%02X\n",
266 id
->dev_type
, id
->dev_model
);
268 ret
+= sprintf(buf
+ ret
, "dtdm\n");
273 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
275 struct ccw_device
*cdev
= to_ccwdev(dev
);
277 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
281 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
283 struct subchannel
*sch
;
285 * Forced offline in disconnected state means
286 * 'throw away device'.
288 sch
= to_subchannel(cdev
->dev
.parent
);
289 device_unregister(&sch
->dev
);
290 /* Reset intparm to zeroes. */
291 sch
->schib
.pmcw
.intparm
= 0;
293 put_device(&sch
->dev
);
297 ccw_device_set_offline(struct ccw_device
*cdev
)
303 if (!cdev
->online
|| !cdev
->drv
)
306 if (cdev
->drv
->set_offline
) {
307 ret
= cdev
->drv
->set_offline(cdev
);
312 spin_lock_irq(cdev
->ccwlock
);
313 ret
= ccw_device_offline(cdev
);
314 if (ret
== -ENODEV
) {
315 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
316 cdev
->private->state
= DEV_STATE_OFFLINE
;
317 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
319 spin_unlock_irq(cdev
->ccwlock
);
322 spin_unlock_irq(cdev
->ccwlock
);
324 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
326 pr_debug("ccw_device_offline returned %d, device %s\n",
327 ret
, cdev
->dev
.bus_id
);
334 ccw_device_set_online(struct ccw_device
*cdev
)
340 if (cdev
->online
|| !cdev
->drv
)
343 spin_lock_irq(cdev
->ccwlock
);
344 ret
= ccw_device_online(cdev
);
345 spin_unlock_irq(cdev
->ccwlock
);
347 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
349 pr_debug("ccw_device_online returned %d, device %s\n",
350 ret
, cdev
->dev
.bus_id
);
353 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
355 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
359 spin_lock_irq(cdev
->ccwlock
);
360 ret
= ccw_device_offline(cdev
);
361 spin_unlock_irq(cdev
->ccwlock
);
363 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
365 pr_debug("ccw_device_offline returned %d, device %s\n",
366 ret
, cdev
->dev
.bus_id
);
367 return (ret
= 0) ? -ENODEV
: ret
;
371 online_store (struct device
*dev
, struct device_attribute
*attr
, const char *buf
, size_t count
)
373 struct ccw_device
*cdev
= to_ccwdev(dev
);
377 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
380 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
381 atomic_set(&cdev
->private->onoff
, 0);
384 if (!strncmp(buf
, "force\n", count
)) {
389 i
= simple_strtoul(buf
, &tmp
, 16);
392 /* Do device recognition, if needed. */
393 if (cdev
->id
.cu_type
== 0) {
394 ret
= ccw_device_recognition(cdev
);
396 printk(KERN_WARNING
"Couldn't start recognition "
397 "for device %s (ret=%d)\n",
398 cdev
->dev
.bus_id
, ret
);
401 wait_event(cdev
->private->wait_q
,
402 cdev
->private->flags
.recog_done
);
404 if (cdev
->drv
&& cdev
->drv
->set_online
)
405 ccw_device_set_online(cdev
);
407 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
408 ccw_device_remove_disconnected(cdev
);
409 else if (cdev
->drv
&& cdev
->drv
->set_offline
)
410 ccw_device_set_offline(cdev
);
412 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
413 ret
= ccw_device_stlck(cdev
);
415 printk(KERN_WARNING
"ccw_device_stlck for device %s "
416 "returned %d!\n", cdev
->dev
.bus_id
, ret
);
419 /* Do device recognition, if needed. */
420 if (cdev
->id
.cu_type
== 0) {
421 cdev
->private->state
= DEV_STATE_NOT_OPER
;
422 ret
= ccw_device_recognition(cdev
);
424 printk(KERN_WARNING
"Couldn't start recognition "
425 "for device %s (ret=%d)\n",
426 cdev
->dev
.bus_id
, ret
);
429 wait_event(cdev
->private->wait_q
,
430 cdev
->private->flags
.recog_done
);
432 if (cdev
->drv
&& cdev
->drv
->set_online
)
433 ccw_device_set_online(cdev
);
437 module_put(cdev
->drv
->owner
);
438 atomic_set(&cdev
->private->onoff
, 0);
443 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
445 struct ccw_device
*cdev
= to_ccwdev(dev
);
446 struct subchannel
*sch
;
448 switch (cdev
->private->state
) {
449 case DEV_STATE_BOXED
:
450 return sprintf(buf
, "boxed\n");
451 case DEV_STATE_DISCONNECTED
:
452 case DEV_STATE_DISCONNECTED_SENSE_ID
:
453 case DEV_STATE_NOT_OPER
:
454 sch
= to_subchannel(dev
->parent
);
456 return sprintf(buf
, "no path\n");
458 return sprintf(buf
, "no device\n");
460 /* All other states considered fine. */
461 return sprintf(buf
, "good\n");
465 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
466 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
467 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
468 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
469 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
470 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
471 extern struct device_attribute dev_attr_cmb_enable
;
472 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
474 static struct attribute
* subch_attrs
[] = {
475 &dev_attr_chpids
.attr
,
476 &dev_attr_pimpampom
.attr
,
480 static struct attribute_group subch_attr_group
= {
481 .attrs
= subch_attrs
,
485 subchannel_add_files (struct device
*dev
)
487 return sysfs_create_group(&dev
->kobj
, &subch_attr_group
);
490 static struct attribute
* ccwdev_attrs
[] = {
491 &dev_attr_devtype
.attr
,
492 &dev_attr_cutype
.attr
,
493 &dev_attr_modalias
.attr
,
494 &dev_attr_online
.attr
,
495 &dev_attr_cmb_enable
.attr
,
496 &dev_attr_availability
.attr
,
500 static struct attribute_group ccwdev_attr_group
= {
501 .attrs
= ccwdev_attrs
,
505 device_add_files (struct device
*dev
)
507 return sysfs_create_group(&dev
->kobj
, &ccwdev_attr_group
);
511 device_remove_files(struct device
*dev
)
513 sysfs_remove_group(&dev
->kobj
, &ccwdev_attr_group
);
516 /* this is a simple abstraction for device_register that sets the
517 * correct bus type and adds the bus specific files */
519 ccw_device_register(struct ccw_device
*cdev
)
521 struct device
*dev
= &cdev
->dev
;
524 dev
->bus
= &ccw_bus_type
;
526 if ((ret
= device_add(dev
)))
529 set_bit(1, &cdev
->private->registered
);
530 if ((ret
= device_add_files(dev
))) {
531 if (test_and_clear_bit(1, &cdev
->private->registered
))
540 struct ccw_device
* sibling
;
544 match_devno(struct device
* dev
, void * data
)
546 struct match_data
* d
= (struct match_data
*)data
;
547 struct ccw_device
* cdev
;
549 cdev
= to_ccwdev(dev
);
550 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
551 (cdev
->private->devno
== d
->devno
) &&
552 (cdev
->private->ssid
== d
->ssid
) &&
553 (cdev
!= d
->sibling
)) {
554 cdev
->private->state
= DEV_STATE_NOT_OPER
;
560 static struct ccw_device
*
561 get_disc_ccwdev_by_devno(unsigned int devno
, unsigned int ssid
,
562 struct ccw_device
*sibling
)
565 struct match_data data
= {
571 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
573 return dev
? to_ccwdev(dev
) : NULL
;
577 ccw_device_add_changed(void *data
)
580 struct ccw_device
*cdev
;
582 cdev
= (struct ccw_device
*)data
;
583 if (device_add(&cdev
->dev
)) {
584 put_device(&cdev
->dev
);
587 set_bit(1, &cdev
->private->registered
);
588 if (device_add_files(&cdev
->dev
)) {
589 if (test_and_clear_bit(1, &cdev
->private->registered
))
590 device_unregister(&cdev
->dev
);
594 extern int css_get_ssd_info(struct subchannel
*sch
);
597 ccw_device_do_unreg_rereg(void *data
)
599 struct ccw_device
*cdev
;
600 struct subchannel
*sch
;
603 cdev
= (struct ccw_device
*)data
;
604 sch
= to_subchannel(cdev
->dev
.parent
);
605 if (cdev
->private->devno
!= sch
->schib
.pmcw
.dev
) {
607 * The device number has changed. This is usually only when
608 * a device has been detached under VM and then re-appeared
609 * on another subchannel because of a different attachment
610 * order than before. Ideally, we should should just switch
611 * subchannels, but unfortunately, this is not possible with
612 * the current implementation.
613 * Instead, we search for the old subchannel for this device
614 * number and deregister so there are no collisions with the
615 * newly registered ccw_device.
616 * FIXME: Find another solution so the block layer doesn't
617 * get possibly sick...
619 struct ccw_device
*other_cdev
;
622 other_cdev
= get_disc_ccwdev_by_devno(sch
->schib
.pmcw
.dev
,
623 sch
->schid
.ssid
, cdev
);
625 struct subchannel
*other_sch
;
627 other_sch
= to_subchannel(other_cdev
->dev
.parent
);
628 if (get_device(&other_sch
->dev
)) {
629 stsch(other_sch
->schid
, &other_sch
->schib
);
630 if (other_sch
->schib
.pmcw
.dnv
) {
631 other_sch
->schib
.pmcw
.intparm
= 0;
632 cio_modify(other_sch
);
634 device_unregister(&other_sch
->dev
);
637 /* Update ssd info here. */
638 css_get_ssd_info(sch
);
639 cdev
->private->devno
= sch
->schib
.pmcw
.dev
;
642 device_remove_files(&cdev
->dev
);
643 if (test_and_clear_bit(1, &cdev
->private->registered
))
644 device_del(&cdev
->dev
);
646 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
647 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
648 PREPARE_WORK(&cdev
->private->kick_work
,
649 ccw_device_add_changed
, (void *)cdev
);
650 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
654 ccw_device_release(struct device
*dev
)
656 struct ccw_device
*cdev
;
658 cdev
= to_ccwdev(dev
);
659 kfree(cdev
->private);
664 * Register recognized device.
667 io_subchannel_register(void *data
)
669 struct ccw_device
*cdev
;
670 struct subchannel
*sch
;
674 cdev
= (struct ccw_device
*) data
;
675 sch
= to_subchannel(cdev
->dev
.parent
);
677 if (klist_node_attached(&cdev
->dev
.knode_parent
)) {
678 bus_rescan_devices(&ccw_bus_type
);
681 /* make it known to the system */
682 ret
= ccw_device_register(cdev
);
684 printk (KERN_WARNING
"%s: could not register %s\n",
685 __func__
, cdev
->dev
.bus_id
);
686 put_device(&cdev
->dev
);
687 spin_lock_irqsave(&sch
->lock
, flags
);
688 sch
->dev
.driver_data
= NULL
;
689 spin_unlock_irqrestore(&sch
->lock
, flags
);
690 kfree (cdev
->private);
692 put_device(&sch
->dev
);
693 if (atomic_dec_and_test(&ccw_device_init_count
))
694 wake_up(&ccw_device_init_wq
);
698 ret
= subchannel_add_files(cdev
->dev
.parent
);
700 printk(KERN_WARNING
"%s: could not add attributes to %s\n",
701 __func__
, sch
->dev
.bus_id
);
702 put_device(&cdev
->dev
);
704 cdev
->private->flags
.recog_done
= 1;
705 put_device(&sch
->dev
);
706 wake_up(&cdev
->private->wait_q
);
707 if (atomic_dec_and_test(&ccw_device_init_count
))
708 wake_up(&ccw_device_init_wq
);
712 ccw_device_call_sch_unregister(void *data
)
714 struct ccw_device
*cdev
= data
;
715 struct subchannel
*sch
;
717 sch
= to_subchannel(cdev
->dev
.parent
);
718 device_unregister(&sch
->dev
);
719 /* Reset intparm to zeroes. */
720 sch
->schib
.pmcw
.intparm
= 0;
722 put_device(&cdev
->dev
);
723 put_device(&sch
->dev
);
727 * subchannel recognition done. Called from the state machine.
730 io_subchannel_recog_done(struct ccw_device
*cdev
)
732 struct subchannel
*sch
;
734 if (css_init_done
== 0) {
735 cdev
->private->flags
.recog_done
= 1;
738 switch (cdev
->private->state
) {
739 case DEV_STATE_NOT_OPER
:
740 cdev
->private->flags
.recog_done
= 1;
741 /* Remove device found not operational. */
742 if (!get_device(&cdev
->dev
))
744 sch
= to_subchannel(cdev
->dev
.parent
);
745 PREPARE_WORK(&cdev
->private->kick_work
,
746 ccw_device_call_sch_unregister
, (void *) cdev
);
747 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
748 if (atomic_dec_and_test(&ccw_device_init_count
))
749 wake_up(&ccw_device_init_wq
);
751 case DEV_STATE_BOXED
:
752 /* Device did not respond in time. */
753 case DEV_STATE_OFFLINE
:
755 * We can't register the device in interrupt context so
756 * we schedule a work item.
758 if (!get_device(&cdev
->dev
))
760 PREPARE_WORK(&cdev
->private->kick_work
,
761 io_subchannel_register
, (void *) cdev
);
762 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
768 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
771 struct ccw_device_private
*priv
;
773 sch
->dev
.driver_data
= cdev
;
774 sch
->driver
= &io_subchannel_driver
;
775 cdev
->ccwlock
= &sch
->lock
;
777 /* Init private data. */
778 priv
= cdev
->private;
779 priv
->devno
= sch
->schib
.pmcw
.dev
;
780 priv
->ssid
= sch
->schid
.ssid
;
781 priv
->sch_no
= sch
->schid
.sch_no
;
782 priv
->state
= DEV_STATE_NOT_OPER
;
783 INIT_LIST_HEAD(&priv
->cmb_list
);
784 init_waitqueue_head(&priv
->wait_q
);
785 init_timer(&priv
->timer
);
787 /* Set an initial name for the device. */
788 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
789 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
791 /* Increase counter of devices currently in recognition. */
792 atomic_inc(&ccw_device_init_count
);
794 /* Start async. device sensing. */
795 spin_lock_irq(&sch
->lock
);
796 rc
= ccw_device_recognition(cdev
);
797 spin_unlock_irq(&sch
->lock
);
799 if (atomic_dec_and_test(&ccw_device_init_count
))
800 wake_up(&ccw_device_init_wq
);
806 io_subchannel_probe (struct device
*pdev
)
808 struct subchannel
*sch
;
809 struct ccw_device
*cdev
;
813 sch
= to_subchannel(pdev
);
814 if (sch
->dev
.driver_data
) {
816 * This subchannel already has an associated ccw_device.
817 * Register it and exit. This happens for all early
818 * device, e.g. the console.
820 cdev
= sch
->dev
.driver_data
;
821 device_initialize(&cdev
->dev
);
822 ccw_device_register(cdev
);
823 subchannel_add_files(&sch
->dev
);
825 * Check if the device is already online. If it is
826 * the reference count needs to be corrected
827 * (see ccw_device_online and css_init_done for the
830 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
831 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
832 cdev
->private->state
!= DEV_STATE_BOXED
)
833 get_device(&cdev
->dev
);
836 cdev
= kmalloc (sizeof(*cdev
), GFP_KERNEL
);
839 memset(cdev
, 0, sizeof(struct ccw_device
));
840 cdev
->private = kmalloc(sizeof(struct ccw_device_private
),
841 GFP_KERNEL
| GFP_DMA
);
842 if (!cdev
->private) {
846 memset(cdev
->private, 0, sizeof(struct ccw_device_private
));
847 atomic_set(&cdev
->private->onoff
, 0);
848 cdev
->dev
= (struct device
) {
850 .release
= ccw_device_release
,
852 INIT_LIST_HEAD(&cdev
->private->kick_work
.entry
);
853 /* Do first half of device_register. */
854 device_initialize(&cdev
->dev
);
856 if (!get_device(&sch
->dev
)) {
857 if (cdev
->dev
.release
)
858 cdev
->dev
.release(&cdev
->dev
);
862 rc
= io_subchannel_recog(cdev
, to_subchannel(pdev
));
864 spin_lock_irqsave(&sch
->lock
, flags
);
865 sch
->dev
.driver_data
= NULL
;
866 spin_unlock_irqrestore(&sch
->lock
, flags
);
867 if (cdev
->dev
.release
)
868 cdev
->dev
.release(&cdev
->dev
);
875 ccw_device_unregister(void *data
)
877 struct ccw_device
*cdev
;
879 cdev
= (struct ccw_device
*)data
;
880 if (test_and_clear_bit(1, &cdev
->private->registered
))
881 device_unregister(&cdev
->dev
);
882 put_device(&cdev
->dev
);
886 io_subchannel_remove (struct device
*dev
)
888 struct ccw_device
*cdev
;
891 if (!dev
->driver_data
)
893 cdev
= dev
->driver_data
;
894 /* Set ccw device to not operational and drop reference. */
895 spin_lock_irqsave(cdev
->ccwlock
, flags
);
896 dev
->driver_data
= NULL
;
897 cdev
->private->state
= DEV_STATE_NOT_OPER
;
898 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
900 * Put unregistration on workqueue to avoid livelocks on the css bus
903 if (get_device(&cdev
->dev
)) {
904 PREPARE_WORK(&cdev
->private->kick_work
,
905 ccw_device_unregister
, (void *) cdev
);
906 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
912 io_subchannel_notify(struct device
*dev
, int event
)
914 struct ccw_device
*cdev
;
916 cdev
= dev
->driver_data
;
923 return cdev
->drv
->notify
? cdev
->drv
->notify(cdev
, event
) : 0;
927 io_subchannel_verify(struct device
*dev
)
929 struct ccw_device
*cdev
;
931 cdev
= dev
->driver_data
;
933 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
937 io_subchannel_ioterm(struct device
*dev
)
939 struct ccw_device
*cdev
;
941 cdev
= dev
->driver_data
;
944 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
946 cdev
->handler(cdev
, cdev
->private->intparm
,
951 io_subchannel_shutdown(struct device
*dev
)
953 struct subchannel
*sch
;
954 struct ccw_device
*cdev
;
957 sch
= to_subchannel(dev
);
958 cdev
= dev
->driver_data
;
960 if (cio_is_console(sch
->schid
))
962 if (!sch
->schib
.pmcw
.ena
)
965 ret
= cio_disable_subchannel(sch
);
967 /* Subchannel is disabled, we're done. */
969 cdev
->private->state
= DEV_STATE_QUIESCE
;
971 cdev
->handler(cdev
, cdev
->private->intparm
,
973 ret
= ccw_device_cancel_halt_clear(cdev
);
975 ccw_device_set_timeout(cdev
, HZ
/10);
976 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
978 cio_disable_subchannel(sch
);
981 #ifdef CONFIG_CCW_CONSOLE
982 static struct ccw_device console_cdev
;
983 static struct ccw_device_private console_private
;
984 static int console_cdev_in_use
;
987 ccw_device_console_enable (struct ccw_device
*cdev
, struct subchannel
*sch
)
991 /* Initialize the ccw_device structure. */
992 cdev
->dev
= (struct device
) {
995 rc
= io_subchannel_recog(cdev
, sch
);
999 /* Now wait for the async. recognition to come to an end. */
1000 spin_lock_irq(cdev
->ccwlock
);
1001 while (!dev_fsm_final_state(cdev
))
1004 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1006 ccw_device_online(cdev
);
1007 while (!dev_fsm_final_state(cdev
))
1009 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1013 spin_unlock_irq(cdev
->ccwlock
);
1018 ccw_device_probe_console(void)
1020 struct subchannel
*sch
;
1023 if (xchg(&console_cdev_in_use
, 1) != 0)
1025 sch
= cio_probe_console();
1027 console_cdev_in_use
= 0;
1028 return (void *) sch
;
1030 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1031 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1032 console_cdev
.private = &console_private
;
1033 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1035 cio_release_console();
1036 console_cdev_in_use
= 0;
1037 return ERR_PTR(ret
);
1039 console_cdev
.online
= 1;
1040 return &console_cdev
;
1045 * get ccw_device matching the busid, but only if owned by cdrv
1048 __ccwdev_check_busid(struct device
*dev
, void *id
)
1052 bus_id
= (char *)id
;
1054 return (strncmp(bus_id
, dev
->bus_id
, BUS_ID_SIZE
) == 0);
1059 get_ccwdev_by_busid(struct ccw_driver
*cdrv
, const char *bus_id
)
1062 struct device_driver
*drv
;
1064 drv
= get_driver(&cdrv
->driver
);
1068 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1069 __ccwdev_check_busid
);
1072 return dev
? to_ccwdev(dev
) : 0;
1075 /************************** device driver handling ************************/
1077 /* This is the implementation of the ccw_driver class. The probe, remove
1078 * and release methods are initially very similar to the device_driver
1079 * implementations, with the difference that they have ccw_device
1082 * A ccw driver also contains the information that is needed for
1086 ccw_device_probe (struct device
*dev
)
1088 struct ccw_device
*cdev
= to_ccwdev(dev
);
1089 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1092 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1094 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1105 ccw_device_remove (struct device
*dev
)
1107 struct ccw_device
*cdev
= to_ccwdev(dev
);
1108 struct ccw_driver
*cdrv
= cdev
->drv
;
1111 pr_debug("removing device %s\n", cdev
->dev
.bus_id
);
1116 spin_lock_irq(cdev
->ccwlock
);
1117 ret
= ccw_device_offline(cdev
);
1118 spin_unlock_irq(cdev
->ccwlock
);
1120 wait_event(cdev
->private->wait_q
,
1121 dev_fsm_final_state(cdev
));
1123 //FIXME: we can't fail!
1124 pr_debug("ccw_device_offline returned %d, device %s\n",
1125 ret
, cdev
->dev
.bus_id
);
1127 ccw_device_set_timeout(cdev
, 0);
1133 ccw_driver_register (struct ccw_driver
*cdriver
)
1135 struct device_driver
*drv
= &cdriver
->driver
;
1137 drv
->bus
= &ccw_bus_type
;
1138 drv
->name
= cdriver
->name
;
1139 drv
->probe
= ccw_device_probe
;
1140 drv
->remove
= ccw_device_remove
;
1142 return driver_register(drv
);
1146 ccw_driver_unregister (struct ccw_driver
*cdriver
)
1148 driver_unregister(&cdriver
->driver
);
1151 /* Helper func for qdio. */
1152 struct subchannel_id
1153 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1155 struct subchannel
*sch
;
1157 sch
= to_subchannel(cdev
->dev
.parent
);
1161 MODULE_LICENSE("GPL");
1162 EXPORT_SYMBOL(ccw_device_set_online
);
1163 EXPORT_SYMBOL(ccw_device_set_offline
);
1164 EXPORT_SYMBOL(ccw_driver_register
);
1165 EXPORT_SYMBOL(ccw_driver_unregister
);
1166 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1167 EXPORT_SYMBOL(ccw_bus_type
);
1168 EXPORT_SYMBOL(ccw_device_work
);
1169 EXPORT_SYMBOL(ccw_device_notify_work
);
1170 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);