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 */
30 /******************* bus type handling ***********************/
32 /* The Linux driver model distinguishes between a bus type and
33 * the bus itself. Of course we only have one channel
34 * subsystem driver and one channel system per machine, but
35 * we still use the abstraction. T.R. says it's a good idea. */
37 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
39 struct ccw_device
*cdev
= to_ccwdev(dev
);
40 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
41 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
46 found
= ccw_device_id_match(ids
, &cdev
->id
);
50 cdev
->id
.driver_info
= found
->driver_info
;
55 /* Store modalias string delimited by prefix/suffix string into buffer with
56 * specified size. Return length of resulting string (excluding trailing '\0')
57 * even if string doesn't fit buffer (snprintf semantics). */
58 static int snprint_alias(char *buf
, size_t size
, const char *prefix
,
59 struct ccw_device_id
*id
, const char *suffix
)
63 len
= snprintf(buf
, size
, "%sccw:t%04Xm%02X", prefix
, id
->cu_type
,
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
);
90 len
= snprintf(buffer
, buffer_size
, "CU_TYPE=%04X", id
->cu_type
) + 1;
91 if (len
> buffer_size
|| i
>= num_envp
)
98 len
= snprintf(buffer
, buffer_size
, "CU_MODEL=%02X", id
->cu_model
) + 1;
99 if (len
> buffer_size
|| i
>= num_envp
)
105 /* The next two can be zero, that's ok for us */
107 len
= snprintf(buffer
, buffer_size
, "DEV_TYPE=%04X", id
->dev_type
) + 1;
108 if (len
> buffer_size
|| i
>= num_envp
)
115 len
= snprintf(buffer
, buffer_size
, "DEV_MODEL=%02X",
116 (unsigned char) id
->dev_model
) + 1;
117 if (len
> buffer_size
|| i
>= num_envp
)
124 len
= snprint_alias(buffer
, buffer_size
, "MODALIAS=", id
, "") + 1;
125 if (len
> buffer_size
|| i
>= num_envp
)
136 struct bus_type ccw_bus_type
;
138 static int io_subchannel_probe (struct subchannel
*);
139 static int io_subchannel_remove (struct subchannel
*);
140 void io_subchannel_irq (struct device
*);
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
]);
240 ret
+= sprintf (buf
+ret
, "\n");
241 return min((ssize_t
)PAGE_SIZE
, ret
);
245 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
247 struct subchannel
*sch
= to_subchannel(dev
);
248 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
250 return sprintf (buf
, "%02x %02x %02x\n",
251 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
255 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
257 struct ccw_device
*cdev
= to_ccwdev(dev
);
258 struct ccw_device_id
*id
= &(cdev
->id
);
260 if (id
->dev_type
!= 0)
261 return sprintf(buf
, "%04x/%02x\n",
262 id
->dev_type
, id
->dev_model
);
264 return sprintf(buf
, "n/a\n");
268 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
270 struct ccw_device
*cdev
= to_ccwdev(dev
);
271 struct ccw_device_id
*id
= &(cdev
->id
);
273 return sprintf(buf
, "%04x/%02x\n",
274 id
->cu_type
, id
->cu_model
);
278 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
280 struct ccw_device
*cdev
= to_ccwdev(dev
);
281 struct ccw_device_id
*id
= &(cdev
->id
);
284 len
= snprint_alias(buf
, PAGE_SIZE
, "", id
, "\n") + 1;
286 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
290 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
292 struct ccw_device
*cdev
= to_ccwdev(dev
);
294 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
297 static void ccw_device_unregister(struct work_struct
*work
)
299 struct ccw_device_private
*priv
;
300 struct ccw_device
*cdev
;
302 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
304 if (test_and_clear_bit(1, &cdev
->private->registered
))
305 device_unregister(&cdev
->dev
);
306 put_device(&cdev
->dev
);
310 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
312 struct subchannel
*sch
;
314 * Forced offline in disconnected state means
315 * 'throw away device'.
317 sch
= to_subchannel(cdev
->dev
.parent
);
318 css_sch_device_unregister(sch
);
319 /* Reset intparm to zeroes. */
320 sch
->schib
.pmcw
.intparm
= 0;
322 put_device(&sch
->dev
);
326 ccw_device_set_offline(struct ccw_device
*cdev
)
332 if (!cdev
->online
|| !cdev
->drv
)
335 if (cdev
->drv
->set_offline
) {
336 ret
= cdev
->drv
->set_offline(cdev
);
341 spin_lock_irq(cdev
->ccwlock
);
342 ret
= ccw_device_offline(cdev
);
343 if (ret
== -ENODEV
) {
344 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
345 cdev
->private->state
= DEV_STATE_OFFLINE
;
346 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
348 spin_unlock_irq(cdev
->ccwlock
);
351 spin_unlock_irq(cdev
->ccwlock
);
353 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
355 pr_debug("ccw_device_offline returned %d, device %s\n",
356 ret
, cdev
->dev
.bus_id
);
363 ccw_device_set_online(struct ccw_device
*cdev
)
369 if (cdev
->online
|| !cdev
->drv
)
372 spin_lock_irq(cdev
->ccwlock
);
373 ret
= ccw_device_online(cdev
);
374 spin_unlock_irq(cdev
->ccwlock
);
376 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
378 pr_debug("ccw_device_online returned %d, device %s\n",
379 ret
, cdev
->dev
.bus_id
);
382 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
384 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
388 spin_lock_irq(cdev
->ccwlock
);
389 ret
= ccw_device_offline(cdev
);
390 spin_unlock_irq(cdev
->ccwlock
);
392 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
394 pr_debug("ccw_device_offline returned %d, device %s\n",
395 ret
, cdev
->dev
.bus_id
);
396 return (ret
== 0) ? -ENODEV
: ret
;
400 online_store (struct device
*dev
, struct device_attribute
*attr
, const char *buf
, size_t count
)
402 struct ccw_device
*cdev
= to_ccwdev(dev
);
406 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
409 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
410 atomic_set(&cdev
->private->onoff
, 0);
413 if (!strncmp(buf
, "force\n", count
)) {
418 i
= simple_strtoul(buf
, &tmp
, 16);
421 /* Do device recognition, if needed. */
422 if (cdev
->id
.cu_type
== 0) {
423 ret
= ccw_device_recognition(cdev
);
425 printk(KERN_WARNING
"Couldn't start recognition "
426 "for device %s (ret=%d)\n",
427 cdev
->dev
.bus_id
, ret
);
430 wait_event(cdev
->private->wait_q
,
431 cdev
->private->flags
.recog_done
);
433 if (cdev
->drv
&& cdev
->drv
->set_online
)
434 ccw_device_set_online(cdev
);
436 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
437 ccw_device_remove_disconnected(cdev
);
438 else if (cdev
->drv
&& cdev
->drv
->set_offline
)
439 ccw_device_set_offline(cdev
);
441 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
442 ret
= ccw_device_stlck(cdev
);
444 printk(KERN_WARNING
"ccw_device_stlck for device %s "
445 "returned %d!\n", cdev
->dev
.bus_id
, ret
);
448 /* Do device recognition, if needed. */
449 if (cdev
->id
.cu_type
== 0) {
450 cdev
->private->state
= DEV_STATE_NOT_OPER
;
451 ret
= ccw_device_recognition(cdev
);
453 printk(KERN_WARNING
"Couldn't start recognition "
454 "for device %s (ret=%d)\n",
455 cdev
->dev
.bus_id
, ret
);
458 wait_event(cdev
->private->wait_q
,
459 cdev
->private->flags
.recog_done
);
461 if (cdev
->drv
&& cdev
->drv
->set_online
)
462 ccw_device_set_online(cdev
);
466 module_put(cdev
->drv
->owner
);
467 atomic_set(&cdev
->private->onoff
, 0);
472 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
474 struct ccw_device
*cdev
= to_ccwdev(dev
);
475 struct subchannel
*sch
;
477 switch (cdev
->private->state
) {
478 case DEV_STATE_BOXED
:
479 return sprintf(buf
, "boxed\n");
480 case DEV_STATE_DISCONNECTED
:
481 case DEV_STATE_DISCONNECTED_SENSE_ID
:
482 case DEV_STATE_NOT_OPER
:
483 sch
= to_subchannel(dev
->parent
);
485 return sprintf(buf
, "no path\n");
487 return sprintf(buf
, "no device\n");
489 /* All other states considered fine. */
490 return sprintf(buf
, "good\n");
494 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
495 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
496 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
497 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
498 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
499 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
500 extern struct device_attribute dev_attr_cmb_enable
;
501 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
503 static struct attribute
* subch_attrs
[] = {
504 &dev_attr_chpids
.attr
,
505 &dev_attr_pimpampom
.attr
,
509 static struct attribute_group subch_attr_group
= {
510 .attrs
= subch_attrs
,
513 int subchannel_add_files (struct device
*dev
)
515 return sysfs_create_group(&dev
->kobj
, &subch_attr_group
);
518 static struct attribute
* ccwdev_attrs
[] = {
519 &dev_attr_devtype
.attr
,
520 &dev_attr_cutype
.attr
,
521 &dev_attr_modalias
.attr
,
522 &dev_attr_online
.attr
,
523 &dev_attr_cmb_enable
.attr
,
524 &dev_attr_availability
.attr
,
528 static struct attribute_group ccwdev_attr_group
= {
529 .attrs
= ccwdev_attrs
,
533 device_add_files (struct device
*dev
)
535 return sysfs_create_group(&dev
->kobj
, &ccwdev_attr_group
);
539 device_remove_files(struct device
*dev
)
541 sysfs_remove_group(&dev
->kobj
, &ccwdev_attr_group
);
544 /* this is a simple abstraction for device_register that sets the
545 * correct bus type and adds the bus specific files */
546 static int ccw_device_register(struct ccw_device
*cdev
)
548 struct device
*dev
= &cdev
->dev
;
551 dev
->bus
= &ccw_bus_type
;
553 if ((ret
= device_add(dev
)))
556 set_bit(1, &cdev
->private->registered
);
557 if ((ret
= device_add_files(dev
))) {
558 if (test_and_clear_bit(1, &cdev
->private->registered
))
565 struct ccw_dev_id dev_id
;
566 struct ccw_device
* sibling
;
570 match_devno(struct device
* dev
, void * data
)
572 struct match_data
* d
= data
;
573 struct ccw_device
* cdev
;
575 cdev
= to_ccwdev(dev
);
576 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
577 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
578 (cdev
!= d
->sibling
)) {
579 cdev
->private->state
= DEV_STATE_NOT_OPER
;
585 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
586 struct ccw_device
*sibling
)
589 struct match_data data
;
591 data
.dev_id
= *dev_id
;
592 data
.sibling
= sibling
;
593 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
595 return dev
? to_ccwdev(dev
) : NULL
;
599 ccw_device_add_changed(struct work_struct
*work
)
601 struct ccw_device_private
*priv
;
602 struct ccw_device
*cdev
;
604 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
606 if (device_add(&cdev
->dev
)) {
607 put_device(&cdev
->dev
);
610 set_bit(1, &cdev
->private->registered
);
611 if (device_add_files(&cdev
->dev
)) {
612 if (test_and_clear_bit(1, &cdev
->private->registered
))
613 device_unregister(&cdev
->dev
);
617 extern int css_get_ssd_info(struct subchannel
*sch
);
620 ccw_device_do_unreg_rereg(struct work_struct
*work
)
622 struct ccw_device_private
*priv
;
623 struct ccw_device
*cdev
;
624 struct subchannel
*sch
;
627 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
629 sch
= to_subchannel(cdev
->dev
.parent
);
630 if (cdev
->private->dev_id
.devno
!= sch
->schib
.pmcw
.dev
) {
632 * The device number has changed. This is usually only when
633 * a device has been detached under VM and then re-appeared
634 * on another subchannel because of a different attachment
635 * order than before. Ideally, we should should just switch
636 * subchannels, but unfortunately, this is not possible with
637 * the current implementation.
638 * Instead, we search for the old subchannel for this device
639 * number and deregister so there are no collisions with the
640 * newly registered ccw_device.
641 * FIXME: Find another solution so the block layer doesn't
642 * get possibly sick...
644 struct ccw_device
*other_cdev
;
645 struct ccw_dev_id dev_id
;
648 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
649 dev_id
.ssid
= sch
->schid
.ssid
;
650 other_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
652 struct subchannel
*other_sch
;
654 other_sch
= to_subchannel(other_cdev
->dev
.parent
);
655 if (get_device(&other_sch
->dev
)) {
656 stsch(other_sch
->schid
, &other_sch
->schib
);
657 if (other_sch
->schib
.pmcw
.dnv
) {
658 other_sch
->schib
.pmcw
.intparm
= 0;
659 cio_modify(other_sch
);
661 css_sch_device_unregister(other_sch
);
664 /* Update ssd info here. */
665 css_get_ssd_info(sch
);
666 cdev
->private->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
669 device_remove_files(&cdev
->dev
);
670 if (test_and_clear_bit(1, &cdev
->private->registered
))
671 device_del(&cdev
->dev
);
673 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
674 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
675 PREPARE_WORK(&cdev
->private->kick_work
,
676 ccw_device_add_changed
);
677 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
681 ccw_device_release(struct device
*dev
)
683 struct ccw_device
*cdev
;
685 cdev
= to_ccwdev(dev
);
686 kfree(cdev
->private);
690 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
692 struct ccw_device
*cdev
;
694 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
696 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
697 GFP_KERNEL
| GFP_DMA
);
702 return ERR_PTR(-ENOMEM
);
705 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
706 struct ccw_device
*cdev
)
708 cdev
->private->cdev
= cdev
;
709 atomic_set(&cdev
->private->onoff
, 0);
710 cdev
->dev
.parent
= &sch
->dev
;
711 cdev
->dev
.release
= ccw_device_release
;
712 INIT_LIST_HEAD(&cdev
->private->kick_work
.entry
);
713 /* Do first half of device_register. */
714 device_initialize(&cdev
->dev
);
715 if (!get_device(&sch
->dev
)) {
716 if (cdev
->dev
.release
)
717 cdev
->dev
.release(&cdev
->dev
);
723 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
725 struct ccw_device
*cdev
;
728 cdev
= io_subchannel_allocate_dev(sch
);
730 ret
= io_subchannel_initialize_dev(sch
, cdev
);
740 * Register recognized device.
743 io_subchannel_register(struct work_struct
*work
)
745 struct ccw_device_private
*priv
;
746 struct ccw_device
*cdev
;
747 struct subchannel
*sch
;
751 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
753 sch
= to_subchannel(cdev
->dev
.parent
);
756 * io_subchannel_register() will also be called after device
757 * recognition has been done for a boxed device (which will already
758 * be registered). We need to reprobe since we may now have sense id
761 if (klist_node_attached(&cdev
->dev
.knode_parent
)) {
763 ret
= device_reprobe(&cdev
->dev
);
765 /* We can't do much here. */
766 dev_info(&cdev
->dev
, "device_reprobe() returned"
771 /* make it known to the system */
772 ret
= ccw_device_register(cdev
);
774 printk (KERN_WARNING
"%s: could not register %s\n",
775 __func__
, cdev
->dev
.bus_id
);
776 put_device(&cdev
->dev
);
777 spin_lock_irqsave(&sch
->lock
, flags
);
778 sch
->dev
.driver_data
= NULL
;
779 spin_unlock_irqrestore(&sch
->lock
, flags
);
780 kfree (cdev
->private);
782 put_device(&sch
->dev
);
783 if (atomic_dec_and_test(&ccw_device_init_count
))
784 wake_up(&ccw_device_init_wq
);
787 put_device(&cdev
->dev
);
789 cdev
->private->flags
.recog_done
= 1;
790 put_device(&sch
->dev
);
791 wake_up(&cdev
->private->wait_q
);
792 if (atomic_dec_and_test(&ccw_device_init_count
))
793 wake_up(&ccw_device_init_wq
);
797 ccw_device_call_sch_unregister(struct work_struct
*work
)
799 struct ccw_device_private
*priv
;
800 struct ccw_device
*cdev
;
801 struct subchannel
*sch
;
803 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
805 sch
= to_subchannel(cdev
->dev
.parent
);
806 css_sch_device_unregister(sch
);
807 /* Reset intparm to zeroes. */
808 sch
->schib
.pmcw
.intparm
= 0;
810 put_device(&cdev
->dev
);
811 put_device(&sch
->dev
);
815 * subchannel recognition done. Called from the state machine.
818 io_subchannel_recog_done(struct ccw_device
*cdev
)
820 struct subchannel
*sch
;
822 if (css_init_done
== 0) {
823 cdev
->private->flags
.recog_done
= 1;
826 switch (cdev
->private->state
) {
827 case DEV_STATE_NOT_OPER
:
828 cdev
->private->flags
.recog_done
= 1;
829 /* Remove device found not operational. */
830 if (!get_device(&cdev
->dev
))
832 sch
= to_subchannel(cdev
->dev
.parent
);
833 PREPARE_WORK(&cdev
->private->kick_work
,
834 ccw_device_call_sch_unregister
);
835 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
836 if (atomic_dec_and_test(&ccw_device_init_count
))
837 wake_up(&ccw_device_init_wq
);
839 case DEV_STATE_BOXED
:
840 /* Device did not respond in time. */
841 case DEV_STATE_OFFLINE
:
843 * We can't register the device in interrupt context so
844 * we schedule a work item.
846 if (!get_device(&cdev
->dev
))
848 PREPARE_WORK(&cdev
->private->kick_work
,
849 io_subchannel_register
);
850 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
856 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
859 struct ccw_device_private
*priv
;
861 sch
->dev
.driver_data
= cdev
;
862 sch
->driver
= &io_subchannel_driver
;
863 cdev
->ccwlock
= &sch
->lock
;
865 /* Init private data. */
866 priv
= cdev
->private;
867 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
868 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
869 priv
->schid
= sch
->schid
;
870 priv
->state
= DEV_STATE_NOT_OPER
;
871 INIT_LIST_HEAD(&priv
->cmb_list
);
872 init_waitqueue_head(&priv
->wait_q
);
873 init_timer(&priv
->timer
);
875 /* Set an initial name for the device. */
876 snprintf (cdev
->dev
.bus_id
, BUS_ID_SIZE
, "0.%x.%04x",
877 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
879 /* Increase counter of devices currently in recognition. */
880 atomic_inc(&ccw_device_init_count
);
882 /* Start async. device sensing. */
883 spin_lock_irq(&sch
->lock
);
884 rc
= ccw_device_recognition(cdev
);
885 spin_unlock_irq(&sch
->lock
);
887 if (atomic_dec_and_test(&ccw_device_init_count
))
888 wake_up(&ccw_device_init_wq
);
894 io_subchannel_probe (struct subchannel
*sch
)
896 struct ccw_device
*cdev
;
900 if (sch
->dev
.driver_data
) {
902 * This subchannel already has an associated ccw_device.
903 * Register it and exit. This happens for all early
904 * device, e.g. the console.
906 cdev
= sch
->dev
.driver_data
;
907 device_initialize(&cdev
->dev
);
908 ccw_device_register(cdev
);
910 * Check if the device is already online. If it is
911 * the reference count needs to be corrected
912 * (see ccw_device_online and css_init_done for the
915 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
916 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
917 cdev
->private->state
!= DEV_STATE_BOXED
)
918 get_device(&cdev
->dev
);
921 cdev
= io_subchannel_create_ccwdev(sch
);
923 return PTR_ERR(cdev
);
925 rc
= io_subchannel_recog(cdev
, sch
);
927 spin_lock_irqsave(&sch
->lock
, flags
);
928 sch
->dev
.driver_data
= NULL
;
929 spin_unlock_irqrestore(&sch
->lock
, flags
);
930 if (cdev
->dev
.release
)
931 cdev
->dev
.release(&cdev
->dev
);
938 io_subchannel_remove (struct subchannel
*sch
)
940 struct ccw_device
*cdev
;
943 if (!sch
->dev
.driver_data
)
945 cdev
= sch
->dev
.driver_data
;
946 /* Set ccw device to not operational and drop reference. */
947 spin_lock_irqsave(cdev
->ccwlock
, flags
);
948 sch
->dev
.driver_data
= NULL
;
949 cdev
->private->state
= DEV_STATE_NOT_OPER
;
950 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
952 * Put unregistration on workqueue to avoid livelocks on the css bus
955 if (get_device(&cdev
->dev
)) {
956 PREPARE_WORK(&cdev
->private->kick_work
,
957 ccw_device_unregister
);
958 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
964 io_subchannel_notify(struct device
*dev
, int event
)
966 struct ccw_device
*cdev
;
968 cdev
= dev
->driver_data
;
975 return cdev
->drv
->notify
? cdev
->drv
->notify(cdev
, event
) : 0;
979 io_subchannel_verify(struct device
*dev
)
981 struct ccw_device
*cdev
;
983 cdev
= dev
->driver_data
;
985 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
989 io_subchannel_ioterm(struct device
*dev
)
991 struct ccw_device
*cdev
;
993 cdev
= dev
->driver_data
;
996 /* Internal I/O will be retried by the interrupt handler. */
997 if (cdev
->private->flags
.intretry
)
999 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1001 cdev
->handler(cdev
, cdev
->private->intparm
,
1006 io_subchannel_shutdown(struct subchannel
*sch
)
1008 struct ccw_device
*cdev
;
1011 cdev
= sch
->dev
.driver_data
;
1013 if (cio_is_console(sch
->schid
))
1015 if (!sch
->schib
.pmcw
.ena
)
1016 /* Nothing to do. */
1018 ret
= cio_disable_subchannel(sch
);
1020 /* Subchannel is disabled, we're done. */
1022 cdev
->private->state
= DEV_STATE_QUIESCE
;
1024 cdev
->handler(cdev
, cdev
->private->intparm
,
1026 ret
= ccw_device_cancel_halt_clear(cdev
);
1027 if (ret
== -EBUSY
) {
1028 ccw_device_set_timeout(cdev
, HZ
/10);
1029 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1031 cio_disable_subchannel(sch
);
1034 #ifdef CONFIG_CCW_CONSOLE
1035 static struct ccw_device console_cdev
;
1036 static struct ccw_device_private console_private
;
1037 static int console_cdev_in_use
;
1040 ccw_device_console_enable (struct ccw_device
*cdev
, struct subchannel
*sch
)
1044 /* Initialize the ccw_device structure. */
1045 cdev
->dev
.parent
= &sch
->dev
;
1046 rc
= io_subchannel_recog(cdev
, sch
);
1050 /* Now wait for the async. recognition to come to an end. */
1051 spin_lock_irq(cdev
->ccwlock
);
1052 while (!dev_fsm_final_state(cdev
))
1055 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1057 ccw_device_online(cdev
);
1058 while (!dev_fsm_final_state(cdev
))
1060 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1064 spin_unlock_irq(cdev
->ccwlock
);
1069 ccw_device_probe_console(void)
1071 struct subchannel
*sch
;
1074 if (xchg(&console_cdev_in_use
, 1) != 0)
1075 return ERR_PTR(-EBUSY
);
1076 sch
= cio_probe_console();
1078 console_cdev_in_use
= 0;
1079 return (void *) sch
;
1081 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1082 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1083 console_cdev
.private = &console_private
;
1084 console_private
.cdev
= &console_cdev
;
1085 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1087 cio_release_console();
1088 console_cdev_in_use
= 0;
1089 return ERR_PTR(ret
);
1091 console_cdev
.online
= 1;
1092 return &console_cdev
;
1097 * get ccw_device matching the busid, but only if owned by cdrv
1100 __ccwdev_check_busid(struct device
*dev
, void *id
)
1106 return (strncmp(bus_id
, dev
->bus_id
, BUS_ID_SIZE
) == 0);
1111 get_ccwdev_by_busid(struct ccw_driver
*cdrv
, const char *bus_id
)
1114 struct device_driver
*drv
;
1116 drv
= get_driver(&cdrv
->driver
);
1120 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1121 __ccwdev_check_busid
);
1124 return dev
? to_ccwdev(dev
) : NULL
;
1127 /************************** device driver handling ************************/
1129 /* This is the implementation of the ccw_driver class. The probe, remove
1130 * and release methods are initially very similar to the device_driver
1131 * implementations, with the difference that they have ccw_device
1134 * A ccw driver also contains the information that is needed for
1138 ccw_device_probe (struct device
*dev
)
1140 struct ccw_device
*cdev
= to_ccwdev(dev
);
1141 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1144 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1146 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1157 ccw_device_remove (struct device
*dev
)
1159 struct ccw_device
*cdev
= to_ccwdev(dev
);
1160 struct ccw_driver
*cdrv
= cdev
->drv
;
1163 pr_debug("removing device %s\n", cdev
->dev
.bus_id
);
1168 spin_lock_irq(cdev
->ccwlock
);
1169 ret
= ccw_device_offline(cdev
);
1170 spin_unlock_irq(cdev
->ccwlock
);
1172 wait_event(cdev
->private->wait_q
,
1173 dev_fsm_final_state(cdev
));
1175 //FIXME: we can't fail!
1176 pr_debug("ccw_device_offline returned %d, device %s\n",
1177 ret
, cdev
->dev
.bus_id
);
1179 ccw_device_set_timeout(cdev
, 0);
1184 struct bus_type ccw_bus_type
= {
1186 .match
= ccw_bus_match
,
1187 .uevent
= ccw_uevent
,
1188 .probe
= ccw_device_probe
,
1189 .remove
= ccw_device_remove
,
1193 ccw_driver_register (struct ccw_driver
*cdriver
)
1195 struct device_driver
*drv
= &cdriver
->driver
;
1197 drv
->bus
= &ccw_bus_type
;
1198 drv
->name
= cdriver
->name
;
1200 return driver_register(drv
);
1204 ccw_driver_unregister (struct ccw_driver
*cdriver
)
1206 driver_unregister(&cdriver
->driver
);
1209 /* Helper func for qdio. */
1210 struct subchannel_id
1211 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1213 struct subchannel
*sch
;
1215 sch
= to_subchannel(cdev
->dev
.parent
);
1219 MODULE_LICENSE("GPL");
1220 EXPORT_SYMBOL(ccw_device_set_online
);
1221 EXPORT_SYMBOL(ccw_device_set_offline
);
1222 EXPORT_SYMBOL(ccw_driver_register
);
1223 EXPORT_SYMBOL(ccw_driver_unregister
);
1224 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1225 EXPORT_SYMBOL(ccw_bus_type
);
1226 EXPORT_SYMBOL(ccw_device_work
);
1227 EXPORT_SYMBOL(ccw_device_notify_work
);
1228 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);