2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
5 * Copyright IBM Corp. 2002,2008
6 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/spinlock.h>
13 #include <linux/errno.h>
14 #include <linux/err.h>
15 #include <linux/slab.h>
16 #include <linux/list.h>
17 #include <linux/device.h>
18 #include <linux/workqueue.h>
19 #include <linux/timer.h>
21 #include <asm/ccwdev.h>
23 #include <asm/param.h> /* HZ */
29 #include "cio_debug.h"
34 #include "blacklist.h"
36 static struct timer_list recovery_timer
;
37 static DEFINE_SPINLOCK(recovery_lock
);
38 static int recovery_phase
;
39 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
41 /******************* bus type handling ***********************/
43 /* The Linux driver model distinguishes between a bus type and
44 * the bus itself. Of course we only have one channel
45 * subsystem driver and one channel system per machine, but
46 * we still use the abstraction. T.R. says it's a good idea. */
48 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
50 struct ccw_device
*cdev
= to_ccwdev(dev
);
51 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
52 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
57 found
= ccw_device_id_match(ids
, &cdev
->id
);
61 cdev
->id
.driver_info
= found
->driver_info
;
66 /* Store modalias string delimited by prefix/suffix string into buffer with
67 * specified size. Return length of resulting string (excluding trailing '\0')
68 * even if string doesn't fit buffer (snprintf semantics). */
69 static int snprint_alias(char *buf
, size_t size
,
70 struct ccw_device_id
*id
, const char *suffix
)
74 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
80 if (id
->dev_type
!= 0)
81 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
82 id
->dev_model
, suffix
);
84 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
89 /* Set up environment variables for ccw device uevent. Return 0 on success,
90 * non-zero otherwise. */
91 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
93 struct ccw_device
*cdev
= to_ccwdev(dev
);
94 struct ccw_device_id
*id
= &(cdev
->id
);
96 char modalias_buf
[30];
99 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
104 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
108 /* The next two can be zero, that's ok for us */
110 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
115 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
120 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
121 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
125 struct bus_type ccw_bus_type
;
127 static void io_subchannel_irq(struct subchannel
*);
128 static int io_subchannel_probe(struct subchannel
*);
129 static int io_subchannel_remove(struct subchannel
*);
130 static void io_subchannel_shutdown(struct subchannel
*);
131 static int io_subchannel_sch_event(struct subchannel
*, int);
132 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
135 static struct css_device_id io_subchannel_ids
[] = {
136 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
137 { /* end of list */ },
139 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
141 static int io_subchannel_prepare(struct subchannel
*sch
)
143 struct ccw_device
*cdev
;
145 * Don't allow suspend while a ccw device registration
146 * is still outstanding.
148 cdev
= sch_get_cdev(sch
);
149 if (cdev
&& !device_is_registered(&cdev
->dev
))
154 static struct css_driver io_subchannel_driver
= {
155 .owner
= THIS_MODULE
,
156 .subchannel_type
= io_subchannel_ids
,
157 .name
= "io_subchannel",
158 .irq
= io_subchannel_irq
,
159 .sch_event
= io_subchannel_sch_event
,
160 .chp_event
= io_subchannel_chp_event
,
161 .probe
= io_subchannel_probe
,
162 .remove
= io_subchannel_remove
,
163 .shutdown
= io_subchannel_shutdown
,
164 .prepare
= io_subchannel_prepare
,
167 struct workqueue_struct
*ccw_device_work
;
168 wait_queue_head_t ccw_device_init_wq
;
169 atomic_t ccw_device_init_count
;
171 static void recovery_func(unsigned long data
);
174 init_ccw_bus_type (void)
178 init_waitqueue_head(&ccw_device_init_wq
);
179 atomic_set(&ccw_device_init_count
, 0);
180 setup_timer(&recovery_timer
, recovery_func
, 0);
182 ccw_device_work
= create_singlethread_workqueue("cio");
183 if (!ccw_device_work
)
184 return -ENOMEM
; /* FIXME: better errno ? */
185 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
187 ret
= -ENOMEM
; /* FIXME: better errno ? */
190 if ((ret
= bus_register (&ccw_bus_type
)))
193 ret
= css_driver_register(&io_subchannel_driver
);
197 wait_event(ccw_device_init_wq
,
198 atomic_read(&ccw_device_init_count
) == 0);
199 flush_workqueue(ccw_device_work
);
203 destroy_workqueue(ccw_device_work
);
205 destroy_workqueue(slow_path_wq
);
210 cleanup_ccw_bus_type (void)
212 css_driver_unregister(&io_subchannel_driver
);
213 bus_unregister(&ccw_bus_type
);
214 destroy_workqueue(ccw_device_work
);
217 subsys_initcall(init_ccw_bus_type
);
218 module_exit(cleanup_ccw_bus_type
);
220 /************************ device handling **************************/
223 * A ccw_device has some interfaces in sysfs in addition to the
225 * The following entries are designed to export the information which
226 * resided in 2.4 in /proc/subchannels. Subchannel and device number
227 * are obvious, so they don't have an entry :)
228 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
231 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
233 struct subchannel
*sch
= to_subchannel(dev
);
234 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
239 for (chp
= 0; chp
< 8; chp
++) {
241 if (ssd
->path_mask
& mask
)
242 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
244 ret
+= sprintf(buf
+ ret
, "00 ");
246 ret
+= sprintf (buf
+ret
, "\n");
247 return min((ssize_t
)PAGE_SIZE
, ret
);
251 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
253 struct subchannel
*sch
= to_subchannel(dev
);
254 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
256 return sprintf (buf
, "%02x %02x %02x\n",
257 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
261 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
263 struct ccw_device
*cdev
= to_ccwdev(dev
);
264 struct ccw_device_id
*id
= &(cdev
->id
);
266 if (id
->dev_type
!= 0)
267 return sprintf(buf
, "%04x/%02x\n",
268 id
->dev_type
, id
->dev_model
);
270 return sprintf(buf
, "n/a\n");
274 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
276 struct ccw_device
*cdev
= to_ccwdev(dev
);
277 struct ccw_device_id
*id
= &(cdev
->id
);
279 return sprintf(buf
, "%04x/%02x\n",
280 id
->cu_type
, id
->cu_model
);
284 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
286 struct ccw_device
*cdev
= to_ccwdev(dev
);
287 struct ccw_device_id
*id
= &(cdev
->id
);
290 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
292 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
296 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
298 struct ccw_device
*cdev
= to_ccwdev(dev
);
300 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
303 int ccw_device_is_orphan(struct ccw_device
*cdev
)
305 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
308 static void ccw_device_unregister(struct ccw_device
*cdev
)
310 if (test_and_clear_bit(1, &cdev
->private->registered
))
311 device_del(&cdev
->dev
);
314 static void ccw_device_remove_orphan_cb(struct work_struct
*work
)
316 struct ccw_device_private
*priv
;
317 struct ccw_device
*cdev
;
319 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
321 ccw_device_unregister(cdev
);
322 put_device(&cdev
->dev
);
323 /* Release cdev reference for workqueue processing. */
324 put_device(&cdev
->dev
);
328 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
333 * Forced offline in disconnected state means
334 * 'throw away device'.
336 if (ccw_device_is_orphan(cdev
)) {
338 * Deregister ccw device.
339 * Unfortunately, we cannot do this directly from the
342 /* Get cdev reference for workqueue processing. */
343 if (!get_device(&cdev
->dev
))
345 spin_lock_irqsave(cdev
->ccwlock
, flags
);
346 cdev
->private->state
= DEV_STATE_NOT_OPER
;
347 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
348 PREPARE_WORK(&cdev
->private->kick_work
,
349 ccw_device_remove_orphan_cb
);
350 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
352 /* Deregister subchannel, which will kill the ccw device. */
353 ccw_device_schedule_sch_unregister(cdev
);
357 * ccw_device_set_offline() - disable a ccw device for I/O
358 * @cdev: target ccw device
360 * This function calls the driver's set_offline() function for @cdev, if
361 * given, and then disables @cdev.
363 * %0 on success and a negative error value on failure.
365 * enabled, ccw device lock not held
367 int ccw_device_set_offline(struct ccw_device
*cdev
)
373 if (!cdev
->online
|| !cdev
->drv
)
376 if (cdev
->drv
->set_offline
) {
377 ret
= cdev
->drv
->set_offline(cdev
);
382 spin_lock_irq(cdev
->ccwlock
);
383 /* Wait until a final state or DISCONNECTED is reached */
384 while (!dev_fsm_final_state(cdev
) &&
385 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
386 spin_unlock_irq(cdev
->ccwlock
);
387 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
388 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
389 spin_lock_irq(cdev
->ccwlock
);
391 ret
= ccw_device_offline(cdev
);
394 spin_unlock_irq(cdev
->ccwlock
);
395 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
396 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
397 /* Give up reference from ccw_device_set_online(). */
398 put_device(&cdev
->dev
);
402 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
403 ret
, cdev
->private->dev_id
.ssid
,
404 cdev
->private->dev_id
.devno
);
405 cdev
->private->state
= DEV_STATE_OFFLINE
;
406 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
407 spin_unlock_irq(cdev
->ccwlock
);
408 /* Give up reference from ccw_device_set_online(). */
409 put_device(&cdev
->dev
);
414 * ccw_device_set_online() - enable a ccw device for I/O
415 * @cdev: target ccw device
417 * This function first enables @cdev and then calls the driver's set_online()
418 * function for @cdev, if given. If set_online() returns an error, @cdev is
421 * %0 on success and a negative error value on failure.
423 * enabled, ccw device lock not held
425 int ccw_device_set_online(struct ccw_device
*cdev
)
432 if (cdev
->online
|| !cdev
->drv
)
434 /* Hold on to an extra reference while device is online. */
435 if (!get_device(&cdev
->dev
))
438 spin_lock_irq(cdev
->ccwlock
);
439 ret
= ccw_device_online(cdev
);
440 spin_unlock_irq(cdev
->ccwlock
);
442 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
444 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
445 "device 0.%x.%04x\n",
446 ret
, cdev
->private->dev_id
.ssid
,
447 cdev
->private->dev_id
.devno
);
448 /* Give up online reference since onlining failed. */
449 put_device(&cdev
->dev
);
452 spin_lock_irq(cdev
->ccwlock
);
453 /* Check if online processing was successful */
454 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
455 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
456 spin_unlock_irq(cdev
->ccwlock
);
457 /* Give up online reference since onlining failed. */
458 put_device(&cdev
->dev
);
461 spin_unlock_irq(cdev
->ccwlock
);
462 if (cdev
->drv
->set_online
)
463 ret
= cdev
->drv
->set_online(cdev
);
470 spin_lock_irq(cdev
->ccwlock
);
471 /* Wait until a final state or DISCONNECTED is reached */
472 while (!dev_fsm_final_state(cdev
) &&
473 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
474 spin_unlock_irq(cdev
->ccwlock
);
475 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
476 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
477 spin_lock_irq(cdev
->ccwlock
);
479 ret2
= ccw_device_offline(cdev
);
482 spin_unlock_irq(cdev
->ccwlock
);
483 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
484 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
485 /* Give up online reference since onlining failed. */
486 put_device(&cdev
->dev
);
490 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
491 "device 0.%x.%04x\n",
492 ret2
, cdev
->private->dev_id
.ssid
,
493 cdev
->private->dev_id
.devno
);
494 cdev
->private->state
= DEV_STATE_OFFLINE
;
495 spin_unlock_irq(cdev
->ccwlock
);
496 /* Give up online reference since onlining failed. */
497 put_device(&cdev
->dev
);
501 static int online_store_handle_offline(struct ccw_device
*cdev
)
503 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
504 ccw_device_remove_disconnected(cdev
);
505 else if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->set_offline
)
506 return ccw_device_set_offline(cdev
);
510 static int online_store_recog_and_online(struct ccw_device
*cdev
)
514 /* Do device recognition, if needed. */
515 if (cdev
->private->state
== DEV_STATE_BOXED
) {
516 ret
= ccw_device_recognition(cdev
);
518 CIO_MSG_EVENT(0, "Couldn't start recognition "
519 "for device 0.%x.%04x (ret=%d)\n",
520 cdev
->private->dev_id
.ssid
,
521 cdev
->private->dev_id
.devno
, ret
);
524 wait_event(cdev
->private->wait_q
,
525 cdev
->private->flags
.recog_done
);
526 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
527 /* recognition failed */
530 if (cdev
->drv
&& cdev
->drv
->set_online
)
531 ccw_device_set_online(cdev
);
535 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
539 ret
= online_store_recog_and_online(cdev
);
542 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
543 ret
= ccw_device_stlck(cdev
);
546 if (cdev
->id
.cu_type
== 0)
547 cdev
->private->state
= DEV_STATE_NOT_OPER
;
548 ret
= online_store_recog_and_online(cdev
);
555 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
556 const char *buf
, size_t count
)
558 struct ccw_device
*cdev
= to_ccwdev(dev
);
562 if ((cdev
->private->state
!= DEV_STATE_OFFLINE
&&
563 cdev
->private->state
!= DEV_STATE_ONLINE
&&
564 cdev
->private->state
!= DEV_STATE_BOXED
&&
565 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) ||
566 atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
569 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
570 atomic_set(&cdev
->private->onoff
, 0);
573 if (!strncmp(buf
, "force\n", count
)) {
579 ret
= strict_strtoul(buf
, 16, &i
);
585 ret
= online_store_handle_offline(cdev
);
588 ret
= online_store_handle_online(cdev
, force
);
595 module_put(cdev
->drv
->owner
);
596 atomic_set(&cdev
->private->onoff
, 0);
597 return (ret
< 0) ? ret
: count
;
601 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
603 struct ccw_device
*cdev
= to_ccwdev(dev
);
604 struct subchannel
*sch
;
606 if (ccw_device_is_orphan(cdev
))
607 return sprintf(buf
, "no device\n");
608 switch (cdev
->private->state
) {
609 case DEV_STATE_BOXED
:
610 return sprintf(buf
, "boxed\n");
611 case DEV_STATE_DISCONNECTED
:
612 case DEV_STATE_DISCONNECTED_SENSE_ID
:
613 case DEV_STATE_NOT_OPER
:
614 sch
= to_subchannel(dev
->parent
);
616 return sprintf(buf
, "no path\n");
618 return sprintf(buf
, "no device\n");
620 /* All other states considered fine. */
621 return sprintf(buf
, "good\n");
625 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
626 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
627 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
628 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
629 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
630 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
631 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
633 static struct attribute
*io_subchannel_attrs
[] = {
634 &dev_attr_chpids
.attr
,
635 &dev_attr_pimpampom
.attr
,
639 static struct attribute_group io_subchannel_attr_group
= {
640 .attrs
= io_subchannel_attrs
,
643 static struct attribute
* ccwdev_attrs
[] = {
644 &dev_attr_devtype
.attr
,
645 &dev_attr_cutype
.attr
,
646 &dev_attr_modalias
.attr
,
647 &dev_attr_online
.attr
,
648 &dev_attr_cmb_enable
.attr
,
649 &dev_attr_availability
.attr
,
653 static struct attribute_group ccwdev_attr_group
= {
654 .attrs
= ccwdev_attrs
,
657 static struct attribute_group
*ccwdev_attr_groups
[] = {
662 /* this is a simple abstraction for device_register that sets the
663 * correct bus type and adds the bus specific files */
664 static int ccw_device_register(struct ccw_device
*cdev
)
666 struct device
*dev
= &cdev
->dev
;
669 dev
->bus
= &ccw_bus_type
;
671 if ((ret
= device_add(dev
)))
674 set_bit(1, &cdev
->private->registered
);
679 struct ccw_dev_id dev_id
;
680 struct ccw_device
* sibling
;
684 match_devno(struct device
* dev
, void * data
)
686 struct match_data
* d
= data
;
687 struct ccw_device
* cdev
;
689 cdev
= to_ccwdev(dev
);
690 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
691 !ccw_device_is_orphan(cdev
) &&
692 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
693 (cdev
!= d
->sibling
))
698 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
699 struct ccw_device
*sibling
)
702 struct match_data data
;
704 data
.dev_id
= *dev_id
;
705 data
.sibling
= sibling
;
706 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
708 return dev
? to_ccwdev(dev
) : NULL
;
711 static int match_orphan(struct device
*dev
, void *data
)
713 struct ccw_dev_id
*dev_id
;
714 struct ccw_device
*cdev
;
717 cdev
= to_ccwdev(dev
);
718 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
721 static struct ccw_device
*
722 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
723 struct ccw_dev_id
*dev_id
)
727 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
730 return dev
? to_ccwdev(dev
) : NULL
;
733 void ccw_device_do_unbind_bind(struct work_struct
*work
)
735 struct ccw_device_private
*priv
;
736 struct ccw_device
*cdev
;
737 struct subchannel
*sch
;
740 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
742 sch
= to_subchannel(cdev
->dev
.parent
);
744 if (test_bit(1, &cdev
->private->registered
)) {
745 device_release_driver(&cdev
->dev
);
746 ret
= device_attach(&cdev
->dev
);
747 WARN_ON(ret
== -ENODEV
);
752 ccw_device_release(struct device
*dev
)
754 struct ccw_device
*cdev
;
756 cdev
= to_ccwdev(dev
);
757 /* Release reference of parent subchannel. */
758 put_device(cdev
->dev
.parent
);
759 kfree(cdev
->private);
763 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
765 struct ccw_device
*cdev
;
767 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
769 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
770 GFP_KERNEL
| GFP_DMA
);
775 return ERR_PTR(-ENOMEM
);
778 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
779 struct ccw_device
*cdev
)
781 cdev
->private->cdev
= cdev
;
782 atomic_set(&cdev
->private->onoff
, 0);
783 cdev
->dev
.parent
= &sch
->dev
;
784 cdev
->dev
.release
= ccw_device_release
;
785 INIT_WORK(&cdev
->private->kick_work
, NULL
);
786 cdev
->dev
.groups
= ccwdev_attr_groups
;
787 /* Do first half of device_register. */
788 device_initialize(&cdev
->dev
);
789 if (!get_device(&sch
->dev
)) {
790 /* Release reference from device_initialize(). */
791 put_device(&cdev
->dev
);
797 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
799 struct ccw_device
*cdev
;
802 cdev
= io_subchannel_allocate_dev(sch
);
804 ret
= io_subchannel_initialize_dev(sch
, cdev
);
811 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
813 static void sch_attach_device(struct subchannel
*sch
,
814 struct ccw_device
*cdev
)
816 css_update_ssd_info(sch
);
817 spin_lock_irq(sch
->lock
);
818 sch_set_cdev(sch
, cdev
);
819 cdev
->private->schid
= sch
->schid
;
820 cdev
->ccwlock
= sch
->lock
;
821 ccw_device_trigger_reprobe(cdev
);
822 spin_unlock_irq(sch
->lock
);
825 static void sch_attach_disconnected_device(struct subchannel
*sch
,
826 struct ccw_device
*cdev
)
828 struct subchannel
*other_sch
;
831 /* Get reference for new parent. */
832 if (!get_device(&sch
->dev
))
834 other_sch
= to_subchannel(cdev
->dev
.parent
);
835 /* Note: device_move() changes cdev->dev.parent */
836 ret
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
838 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
839 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
840 cdev
->private->dev_id
.devno
, ret
);
841 /* Put reference for new parent. */
842 put_device(&sch
->dev
);
845 sch_set_cdev(other_sch
, NULL
);
846 /* No need to keep a subchannel without ccw device around. */
847 css_sch_device_unregister(other_sch
);
848 sch_attach_device(sch
, cdev
);
849 /* Put reference for old parent. */
850 put_device(&other_sch
->dev
);
853 static void sch_attach_orphaned_device(struct subchannel
*sch
,
854 struct ccw_device
*cdev
)
857 struct subchannel
*pseudo_sch
;
859 /* Get reference for new parent. */
860 if (!get_device(&sch
->dev
))
862 pseudo_sch
= to_subchannel(cdev
->dev
.parent
);
864 * Try to move the ccw device to its new subchannel.
865 * Note: device_move() changes cdev->dev.parent
867 ret
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
869 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
870 "failed (ret=%d)!\n",
871 cdev
->private->dev_id
.ssid
,
872 cdev
->private->dev_id
.devno
, ret
);
873 /* Put reference for new parent. */
874 put_device(&sch
->dev
);
877 sch_attach_device(sch
, cdev
);
878 /* Put reference on pseudo subchannel. */
879 put_device(&pseudo_sch
->dev
);
882 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
884 struct ccw_device
*cdev
;
886 /* Need to allocate a new ccw device. */
887 cdev
= io_subchannel_create_ccwdev(sch
);
889 /* OK, we did everything we could... */
890 css_sch_device_unregister(sch
);
893 spin_lock_irq(sch
->lock
);
894 sch_set_cdev(sch
, cdev
);
895 spin_unlock_irq(sch
->lock
);
896 /* Start recognition for the new ccw device. */
897 if (io_subchannel_recog(cdev
, sch
)) {
898 spin_lock_irq(sch
->lock
);
899 sch_set_cdev(sch
, NULL
);
900 spin_unlock_irq(sch
->lock
);
901 css_sch_device_unregister(sch
);
902 /* Put reference from io_subchannel_create_ccwdev(). */
903 put_device(&sch
->dev
);
904 /* Give up initial reference. */
905 put_device(&cdev
->dev
);
910 void ccw_device_move_to_orphanage(struct work_struct
*work
)
912 struct ccw_device_private
*priv
;
913 struct ccw_device
*cdev
;
914 struct ccw_device
*replacing_cdev
;
915 struct subchannel
*sch
;
917 struct channel_subsystem
*css
;
918 struct ccw_dev_id dev_id
;
920 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
922 sch
= to_subchannel(cdev
->dev
.parent
);
923 css
= to_css(sch
->dev
.parent
);
924 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
925 dev_id
.ssid
= sch
->schid
.ssid
;
927 /* Increase refcount for pseudo subchannel. */
928 get_device(&css
->pseudo_subchannel
->dev
);
930 * Move the orphaned ccw device to the orphanage so the replacing
931 * ccw device can take its place on the subchannel.
932 * Note: device_move() changes cdev->dev.parent
934 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
,
937 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
938 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
939 cdev
->private->dev_id
.devno
, ret
);
940 /* Decrease refcount for pseudo subchannel again. */
941 put_device(&css
->pseudo_subchannel
->dev
);
944 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
946 * Search for the replacing ccw device
947 * - among the disconnected devices
950 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
951 if (replacing_cdev
) {
952 sch_attach_disconnected_device(sch
, replacing_cdev
);
953 /* Release reference from get_disc_ccwdev_by_dev_id() */
954 put_device(&replacing_cdev
->dev
);
955 /* Release reference of subchannel from old cdev. */
956 put_device(&sch
->dev
);
959 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
960 if (replacing_cdev
) {
961 sch_attach_orphaned_device(sch
, replacing_cdev
);
962 /* Release reference from get_orphaned_ccwdev_by_dev_id() */
963 put_device(&replacing_cdev
->dev
);
964 /* Release reference of subchannel from old cdev. */
965 put_device(&sch
->dev
);
968 sch_create_and_recog_new_device(sch
);
969 /* Release reference of subchannel from old cdev. */
970 put_device(&sch
->dev
);
974 * Register recognized device.
977 io_subchannel_register(struct work_struct
*work
)
979 struct ccw_device_private
*priv
;
980 struct ccw_device
*cdev
;
981 struct subchannel
*sch
;
985 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
987 sch
= to_subchannel(cdev
->dev
.parent
);
989 * Check if subchannel is still registered. It may have become
990 * unregistered if a machine check hit us after finishing
991 * device recognition but before the register work could be
994 if (!device_is_registered(&sch
->dev
))
996 css_update_ssd_info(sch
);
998 * io_subchannel_register() will also be called after device
999 * recognition has been done for a boxed device (which will already
1000 * be registered). We need to reprobe since we may now have sense id
1003 if (device_is_registered(&cdev
->dev
)) {
1005 ret
= device_reprobe(&cdev
->dev
);
1007 /* We can't do much here. */
1008 CIO_MSG_EVENT(0, "device_reprobe() returned"
1009 " %d for 0.%x.%04x\n", ret
,
1010 cdev
->private->dev_id
.ssid
,
1011 cdev
->private->dev_id
.devno
);
1016 * Now we know this subchannel will stay, we can throw
1017 * our delayed uevent.
1019 dev_set_uevent_suppress(&sch
->dev
, 0);
1020 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1021 /* make it known to the system */
1022 ret
= ccw_device_register(cdev
);
1024 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
1025 cdev
->private->dev_id
.ssid
,
1026 cdev
->private->dev_id
.devno
, ret
);
1027 spin_lock_irqsave(sch
->lock
, flags
);
1028 sch_set_cdev(sch
, NULL
);
1029 spin_unlock_irqrestore(sch
->lock
, flags
);
1030 /* Release initial device reference. */
1031 put_device(&cdev
->dev
);
1035 cdev
->private->flags
.recog_done
= 1;
1036 wake_up(&cdev
->private->wait_q
);
1038 /* Release reference for workqueue processing. */
1039 put_device(&cdev
->dev
);
1040 if (atomic_dec_and_test(&ccw_device_init_count
))
1041 wake_up(&ccw_device_init_wq
);
1044 static void ccw_device_call_sch_unregister(struct work_struct
*work
)
1046 struct ccw_device_private
*priv
;
1047 struct ccw_device
*cdev
;
1048 struct subchannel
*sch
;
1050 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1052 /* Get subchannel reference for local processing. */
1053 if (!get_device(cdev
->dev
.parent
))
1055 sch
= to_subchannel(cdev
->dev
.parent
);
1056 css_sch_device_unregister(sch
);
1057 /* Release cdev reference for workqueue processing.*/
1058 put_device(&cdev
->dev
);
1059 /* Release subchannel reference for local processing. */
1060 put_device(&sch
->dev
);
1063 void ccw_device_schedule_sch_unregister(struct ccw_device
*cdev
)
1065 /* Get cdev reference for workqueue processing. */
1066 if (!get_device(&cdev
->dev
))
1068 PREPARE_WORK(&cdev
->private->kick_work
,
1069 ccw_device_call_sch_unregister
);
1070 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1074 * subchannel recognition done. Called from the state machine.
1077 io_subchannel_recog_done(struct ccw_device
*cdev
)
1079 if (css_init_done
== 0) {
1080 cdev
->private->flags
.recog_done
= 1;
1083 switch (cdev
->private->state
) {
1084 case DEV_STATE_BOXED
:
1085 /* Device did not respond in time. */
1086 case DEV_STATE_NOT_OPER
:
1087 cdev
->private->flags
.recog_done
= 1;
1088 ccw_device_schedule_sch_unregister(cdev
);
1089 if (atomic_dec_and_test(&ccw_device_init_count
))
1090 wake_up(&ccw_device_init_wq
);
1092 case DEV_STATE_OFFLINE
:
1094 * We can't register the device in interrupt context so
1095 * we schedule a work item.
1097 if (!get_device(&cdev
->dev
))
1099 PREPARE_WORK(&cdev
->private->kick_work
,
1100 io_subchannel_register
);
1101 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1107 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
1110 struct ccw_device_private
*priv
;
1112 sch_set_cdev(sch
, cdev
);
1113 cdev
->ccwlock
= sch
->lock
;
1115 /* Init private data. */
1116 priv
= cdev
->private;
1117 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1118 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
1119 priv
->schid
= sch
->schid
;
1120 priv
->state
= DEV_STATE_NOT_OPER
;
1121 INIT_LIST_HEAD(&priv
->cmb_list
);
1122 init_waitqueue_head(&priv
->wait_q
);
1123 init_timer(&priv
->timer
);
1125 /* Set an initial name for the device. */
1126 if (cio_is_console(sch
->schid
))
1127 cdev
->dev
.init_name
= cio_get_console_cdev_name(sch
);
1129 dev_set_name(&cdev
->dev
, "0.%x.%04x",
1130 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1132 /* Increase counter of devices currently in recognition. */
1133 atomic_inc(&ccw_device_init_count
);
1135 /* Start async. device sensing. */
1136 spin_lock_irq(sch
->lock
);
1137 rc
= ccw_device_recognition(cdev
);
1138 spin_unlock_irq(sch
->lock
);
1140 if (atomic_dec_and_test(&ccw_device_init_count
))
1141 wake_up(&ccw_device_init_wq
);
1146 static void ccw_device_move_to_sch(struct work_struct
*work
)
1148 struct ccw_device_private
*priv
;
1150 struct subchannel
*sch
;
1151 struct ccw_device
*cdev
;
1152 struct subchannel
*former_parent
;
1154 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1157 former_parent
= to_subchannel(cdev
->dev
.parent
);
1158 /* Get reference for new parent. */
1159 if (!get_device(&sch
->dev
))
1161 mutex_lock(&sch
->reg_mutex
);
1163 * Try to move the ccw device to its new subchannel.
1164 * Note: device_move() changes cdev->dev.parent
1166 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
1167 mutex_unlock(&sch
->reg_mutex
);
1169 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1170 "0.%x.%04x failed (ret=%d)!\n",
1171 cdev
->private->dev_id
.ssid
,
1172 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1173 sch
->schid
.sch_no
, rc
);
1174 css_sch_device_unregister(sch
);
1175 /* Put reference for new parent again. */
1176 put_device(&sch
->dev
);
1179 if (!sch_is_pseudo_sch(former_parent
)) {
1180 spin_lock_irq(former_parent
->lock
);
1181 sch_set_cdev(former_parent
, NULL
);
1182 spin_unlock_irq(former_parent
->lock
);
1183 css_sch_device_unregister(former_parent
);
1184 /* Reset intparm to zeroes. */
1185 former_parent
->config
.intparm
= 0;
1186 cio_commit_config(former_parent
);
1188 sch_attach_device(sch
, cdev
);
1190 /* Put reference for old parent. */
1191 put_device(&former_parent
->dev
);
1192 put_device(&cdev
->dev
);
1195 static void io_subchannel_irq(struct subchannel
*sch
)
1197 struct ccw_device
*cdev
;
1199 cdev
= sch_get_cdev(sch
);
1201 CIO_TRACE_EVENT(6, "IRQ");
1202 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
1204 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1207 void io_subchannel_init_config(struct subchannel
*sch
)
1209 memset(&sch
->config
, 0, sizeof(sch
->config
));
1210 sch
->config
.csense
= 1;
1211 /* Use subchannel mp mode when there is more than 1 installed CHPID. */
1212 if ((sch
->schib
.pmcw
.pim
& (sch
->schib
.pmcw
.pim
- 1)) != 0)
1216 static void io_subchannel_init_fields(struct subchannel
*sch
)
1218 if (cio_is_console(sch
->schid
))
1221 sch
->opm
= chp_get_sch_opm(sch
);
1222 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1223 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1225 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1226 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1227 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1228 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1229 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1231 io_subchannel_init_config(sch
);
1234 static void io_subchannel_do_unreg(struct work_struct
*work
)
1236 struct subchannel
*sch
;
1238 sch
= container_of(work
, struct subchannel
, work
);
1239 css_sch_device_unregister(sch
);
1240 put_device(&sch
->dev
);
1243 /* Schedule unregister if we have no cdev. */
1244 static void io_subchannel_schedule_removal(struct subchannel
*sch
)
1246 get_device(&sch
->dev
);
1247 INIT_WORK(&sch
->work
, io_subchannel_do_unreg
);
1248 queue_work(slow_path_wq
, &sch
->work
);
1252 * Note: We always return 0 so that we bind to the device even on error.
1253 * This is needed so that our remove function is called on unregister.
1255 static int io_subchannel_probe(struct subchannel
*sch
)
1257 struct ccw_device
*cdev
;
1259 unsigned long flags
;
1260 struct ccw_dev_id dev_id
;
1262 cdev
= sch_get_cdev(sch
);
1264 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1265 &io_subchannel_attr_group
);
1267 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1268 "attributes for subchannel "
1269 "0.%x.%04x (rc=%d)\n",
1270 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1272 * This subchannel already has an associated ccw_device.
1273 * Throw the delayed uevent for the subchannel, register
1274 * the ccw_device and exit. This happens for all early
1275 * devices, e.g. the console.
1277 dev_set_uevent_suppress(&sch
->dev
, 0);
1278 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1279 cdev
->dev
.groups
= ccwdev_attr_groups
;
1280 device_initialize(&cdev
->dev
);
1281 ccw_device_register(cdev
);
1283 * Check if the device is already online. If it is
1284 * the reference count needs to be corrected since we
1285 * didn't obtain a reference in ccw_device_set_online.
1287 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1288 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1289 cdev
->private->state
!= DEV_STATE_BOXED
)
1290 get_device(&cdev
->dev
);
1293 io_subchannel_init_fields(sch
);
1294 rc
= cio_commit_config(sch
);
1297 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1298 &io_subchannel_attr_group
);
1301 /* Allocate I/O subchannel private data. */
1302 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1303 GFP_KERNEL
| GFP_DMA
);
1307 * First check if a fitting device may be found amongst the
1308 * disconnected devices or in the orphanage.
1310 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1311 dev_id
.ssid
= sch
->schid
.ssid
;
1312 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1314 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1318 * Schedule moving the device until when we have a registered
1319 * subchannel to move to and succeed the probe. We can
1320 * unregister later again, when the probe is through.
1322 cdev
->private->sch
= sch
;
1323 PREPARE_WORK(&cdev
->private->kick_work
,
1324 ccw_device_move_to_sch
);
1325 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1328 cdev
= io_subchannel_create_ccwdev(sch
);
1331 rc
= io_subchannel_recog(cdev
, sch
);
1333 spin_lock_irqsave(sch
->lock
, flags
);
1334 io_subchannel_recog_done(cdev
);
1335 spin_unlock_irqrestore(sch
->lock
, flags
);
1339 kfree(sch
->private);
1340 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1342 io_subchannel_schedule_removal(sch
);
1347 io_subchannel_remove (struct subchannel
*sch
)
1349 struct ccw_device
*cdev
;
1350 unsigned long flags
;
1352 cdev
= sch_get_cdev(sch
);
1355 /* Set ccw device to not operational and drop reference. */
1356 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1357 sch_set_cdev(sch
, NULL
);
1358 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1359 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1360 ccw_device_unregister(cdev
);
1361 put_device(&cdev
->dev
);
1362 kfree(sch
->private);
1363 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1367 static int io_subchannel_notify(struct subchannel
*sch
, int event
)
1369 struct ccw_device
*cdev
;
1371 cdev
= sch_get_cdev(sch
);
1374 return ccw_device_notify(cdev
, event
);
1377 static void io_subchannel_verify(struct subchannel
*sch
)
1379 struct ccw_device
*cdev
;
1381 cdev
= sch_get_cdev(sch
);
1383 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1386 static int check_for_io_on_path(struct subchannel
*sch
, int mask
)
1388 if (cio_update_schib(sch
))
1390 if (scsw_actl(&sch
->schib
.scsw
) && sch
->schib
.pmcw
.lpum
== mask
)
1395 static void terminate_internal_io(struct subchannel
*sch
,
1396 struct ccw_device
*cdev
)
1398 if (cio_clear(sch
)) {
1399 /* Recheck device in case clear failed. */
1402 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1404 css_schedule_eval(sch
->schid
);
1407 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1408 /* Request retry of internal operation. */
1409 cdev
->private->flags
.intretry
= 1;
1412 cdev
->handler(cdev
, cdev
->private->intparm
,
1416 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1418 struct ccw_device
*cdev
;
1420 cdev
= sch_get_cdev(sch
);
1423 if (check_for_io_on_path(sch
, mask
)) {
1424 if (cdev
->private->state
== DEV_STATE_ONLINE
)
1425 ccw_device_kill_io(cdev
);
1427 terminate_internal_io(sch
, cdev
);
1428 /* Re-start path verification. */
1429 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1432 /* trigger path verification. */
1433 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1437 static int io_subchannel_chp_event(struct subchannel
*sch
,
1438 struct chp_link
*link
, int event
)
1442 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1449 io_subchannel_terminate_path(sch
, mask
);
1454 io_subchannel_verify(sch
);
1457 if (cio_update_schib(sch
))
1459 io_subchannel_terminate_path(sch
, mask
);
1462 if (cio_update_schib(sch
))
1464 sch
->lpm
|= mask
& sch
->opm
;
1465 io_subchannel_verify(sch
);
1472 io_subchannel_shutdown(struct subchannel
*sch
)
1474 struct ccw_device
*cdev
;
1477 cdev
= sch_get_cdev(sch
);
1479 if (cio_is_console(sch
->schid
))
1481 if (!sch
->schib
.pmcw
.ena
)
1482 /* Nothing to do. */
1484 ret
= cio_disable_subchannel(sch
);
1486 /* Subchannel is disabled, we're done. */
1488 cdev
->private->state
= DEV_STATE_QUIESCE
;
1490 cdev
->handler(cdev
, cdev
->private->intparm
,
1492 ret
= ccw_device_cancel_halt_clear(cdev
);
1493 if (ret
== -EBUSY
) {
1494 ccw_device_set_timeout(cdev
, HZ
/10);
1495 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1497 cio_disable_subchannel(sch
);
1500 static int io_subchannel_get_status(struct subchannel
*sch
)
1504 if (stsch(sch
->schid
, &schib
) || !schib
.pmcw
.dnv
)
1506 if (sch
->schib
.pmcw
.dnv
&& (schib
.pmcw
.dev
!= sch
->schib
.pmcw
.dev
))
1507 return CIO_REVALIDATE
;
1513 static int device_is_disconnected(struct ccw_device
*cdev
)
1517 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1518 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1521 static int recovery_check(struct device
*dev
, void *data
)
1523 struct ccw_device
*cdev
= to_ccwdev(dev
);
1526 spin_lock_irq(cdev
->ccwlock
);
1527 switch (cdev
->private->state
) {
1528 case DEV_STATE_DISCONNECTED
:
1529 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1530 cdev
->private->dev_id
.ssid
,
1531 cdev
->private->dev_id
.devno
);
1532 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1535 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1539 spin_unlock_irq(cdev
->ccwlock
);
1544 static void recovery_work_func(struct work_struct
*unused
)
1548 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1550 spin_lock_irq(&recovery_lock
);
1551 if (!timer_pending(&recovery_timer
)) {
1552 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1554 mod_timer(&recovery_timer
, jiffies
+
1555 recovery_delay
[recovery_phase
] * HZ
);
1557 spin_unlock_irq(&recovery_lock
);
1559 CIO_MSG_EVENT(4, "recovery: end\n");
1562 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1564 static void recovery_func(unsigned long data
)
1567 * We can't do our recovery in softirq context and it's not
1568 * performance critical, so we schedule it.
1570 schedule_work(&recovery_work
);
1573 static void ccw_device_schedule_recovery(void)
1575 unsigned long flags
;
1577 CIO_MSG_EVENT(4, "recovery: schedule\n");
1578 spin_lock_irqsave(&recovery_lock
, flags
);
1579 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1581 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1583 spin_unlock_irqrestore(&recovery_lock
, flags
);
1586 static int purge_fn(struct device
*dev
, void *data
)
1588 struct ccw_device
*cdev
= to_ccwdev(dev
);
1589 struct ccw_device_private
*priv
= cdev
->private;
1592 spin_lock_irq(cdev
->ccwlock
);
1593 unreg
= is_blacklisted(priv
->dev_id
.ssid
, priv
->dev_id
.devno
) &&
1594 (priv
->state
== DEV_STATE_OFFLINE
);
1595 spin_unlock_irq(cdev
->ccwlock
);
1598 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv
->dev_id
.ssid
,
1599 priv
->dev_id
.devno
);
1600 ccw_device_schedule_sch_unregister(cdev
);
1603 /* Abort loop in case of pending signal. */
1604 if (signal_pending(current
))
1611 * ccw_purge_blacklisted - purge unused, blacklisted devices
1613 * Unregister all ccw devices that are offline and on the blacklist.
1615 int ccw_purge_blacklisted(void)
1617 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1618 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1622 static void device_set_disconnected(struct ccw_device
*cdev
)
1626 ccw_device_set_timeout(cdev
, 0);
1627 cdev
->private->flags
.fake_irb
= 0;
1628 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1630 ccw_device_schedule_recovery();
1633 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1635 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1637 CIO_TRACE_EVENT(2, "notoper");
1638 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1639 ccw_device_set_timeout(cdev
, 0);
1640 cio_disable_subchannel(sch
);
1641 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1644 static int io_subchannel_sch_event(struct subchannel
*sch
, int slow
)
1646 int event
, ret
, disc
;
1647 unsigned long flags
;
1648 enum { NONE
, UNREGISTER
, UNREGISTER_PROBE
, REPROBE
, DISC
} action
;
1649 struct ccw_device
*cdev
;
1651 spin_lock_irqsave(sch
->lock
, flags
);
1652 cdev
= sch_get_cdev(sch
);
1653 disc
= device_is_disconnected(cdev
);
1655 /* Disconnected devices are evaluated directly only.*/
1656 spin_unlock_irqrestore(sch
->lock
, flags
);
1659 /* No interrupt after machine check - kill pending timers. */
1661 ccw_device_set_timeout(cdev
, 0);
1662 if (!disc
&& !slow
) {
1663 /* Non-disconnected devices are evaluated on the slow path. */
1664 spin_unlock_irqrestore(sch
->lock
, flags
);
1667 event
= io_subchannel_get_status(sch
);
1668 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1669 sch
->schid
.ssid
, sch
->schid
.sch_no
, event
,
1670 disc
? "disconnected" : "normal",
1671 slow
? "slow" : "fast");
1672 /* Analyze subchannel status. */
1677 /* Check if paths have become available. */
1683 /* Ask driver what to do with device. */
1684 if (io_subchannel_notify(sch
, event
))
1687 action
= UNREGISTER
;
1689 case CIO_REVALIDATE
:
1690 /* Device will be removed, so no notify necessary. */
1692 /* Reprobe because immediate unregister might block. */
1695 action
= UNREGISTER_PROBE
;
1699 /* Get device operational again. */
1703 /* Perform action. */
1707 case UNREGISTER_PROBE
:
1708 ccw_device_set_notoper(cdev
);
1709 /* Unregister device (will use subchannel lock). */
1710 spin_unlock_irqrestore(sch
->lock
, flags
);
1711 css_sch_device_unregister(sch
);
1712 spin_lock_irqsave(sch
->lock
, flags
);
1715 ccw_device_trigger_reprobe(cdev
);
1718 device_set_disconnected(cdev
);
1723 spin_unlock_irqrestore(sch
->lock
, flags
);
1724 /* Probe if necessary. */
1725 if (action
== UNREGISTER_PROBE
)
1726 ret
= css_probe_device(sch
->schid
);
1731 #ifdef CONFIG_CCW_CONSOLE
1732 static struct ccw_device console_cdev
;
1733 static char console_cdev_name
[10] = "0.x.xxxx";
1734 static struct ccw_device_private console_private
;
1735 static int console_cdev_in_use
;
1737 static DEFINE_SPINLOCK(ccw_console_lock
);
1739 spinlock_t
* cio_get_console_lock(void)
1741 return &ccw_console_lock
;
1744 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1745 struct subchannel
*sch
)
1749 /* Attach subchannel private data. */
1750 sch
->private = cio_get_console_priv();
1751 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1752 io_subchannel_init_fields(sch
);
1753 rc
= cio_commit_config(sch
);
1756 sch
->driver
= &io_subchannel_driver
;
1757 /* Initialize the ccw_device structure. */
1758 cdev
->dev
.parent
= &sch
->dev
;
1759 rc
= io_subchannel_recog(cdev
, sch
);
1763 /* Now wait for the async. recognition to come to an end. */
1764 spin_lock_irq(cdev
->ccwlock
);
1765 while (!dev_fsm_final_state(cdev
))
1768 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1770 ccw_device_online(cdev
);
1771 while (!dev_fsm_final_state(cdev
))
1773 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1777 spin_unlock_irq(cdev
->ccwlock
);
1782 ccw_device_probe_console(void)
1784 struct subchannel
*sch
;
1787 if (xchg(&console_cdev_in_use
, 1) != 0)
1788 return ERR_PTR(-EBUSY
);
1789 sch
= cio_probe_console();
1791 console_cdev_in_use
= 0;
1792 return (void *) sch
;
1794 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1795 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1796 console_cdev
.private = &console_private
;
1797 console_private
.cdev
= &console_cdev
;
1798 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1800 cio_release_console();
1801 console_cdev_in_use
= 0;
1802 return ERR_PTR(ret
);
1804 console_cdev
.online
= 1;
1805 return &console_cdev
;
1808 static int ccw_device_pm_restore(struct device
*dev
);
1810 int ccw_device_force_console(void)
1812 if (!console_cdev_in_use
)
1814 return ccw_device_pm_restore(&console_cdev
.dev
);
1816 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1818 const char *cio_get_console_cdev_name(struct subchannel
*sch
)
1820 snprintf(console_cdev_name
, 10, "0.%x.%04x",
1821 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1822 return (const char *)console_cdev_name
;
1827 * get ccw_device matching the busid, but only if owned by cdrv
1830 __ccwdev_check_busid(struct device
*dev
, void *id
)
1836 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1841 * get_ccwdev_by_busid() - obtain device from a bus id
1842 * @cdrv: driver the device is owned by
1843 * @bus_id: bus id of the device to be searched
1845 * This function searches all devices owned by @cdrv for a device with a bus
1846 * id matching @bus_id.
1848 * If a match is found, its reference count of the found device is increased
1849 * and it is returned; else %NULL is returned.
1851 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1855 struct device_driver
*drv
;
1857 drv
= get_driver(&cdrv
->driver
);
1861 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1862 __ccwdev_check_busid
);
1865 return dev
? to_ccwdev(dev
) : NULL
;
1868 /************************** device driver handling ************************/
1870 /* This is the implementation of the ccw_driver class. The probe, remove
1871 * and release methods are initially very similar to the device_driver
1872 * implementations, with the difference that they have ccw_device
1875 * A ccw driver also contains the information that is needed for
1879 ccw_device_probe (struct device
*dev
)
1881 struct ccw_device
*cdev
= to_ccwdev(dev
);
1882 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1885 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1887 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1898 ccw_device_remove (struct device
*dev
)
1900 struct ccw_device
*cdev
= to_ccwdev(dev
);
1901 struct ccw_driver
*cdrv
= cdev
->drv
;
1908 spin_lock_irq(cdev
->ccwlock
);
1909 ret
= ccw_device_offline(cdev
);
1910 spin_unlock_irq(cdev
->ccwlock
);
1912 wait_event(cdev
->private->wait_q
,
1913 dev_fsm_final_state(cdev
));
1915 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1916 "device 0.%x.%04x\n",
1917 ret
, cdev
->private->dev_id
.ssid
,
1918 cdev
->private->dev_id
.devno
);
1919 /* Give up reference obtained in ccw_device_set_online(). */
1920 put_device(&cdev
->dev
);
1922 ccw_device_set_timeout(cdev
, 0);
1927 static void ccw_device_shutdown(struct device
*dev
)
1929 struct ccw_device
*cdev
;
1931 cdev
= to_ccwdev(dev
);
1932 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1933 cdev
->drv
->shutdown(cdev
);
1937 static int ccw_device_pm_prepare(struct device
*dev
)
1939 struct ccw_device
*cdev
= to_ccwdev(dev
);
1941 if (work_pending(&cdev
->private->kick_work
))
1943 /* Fail while device is being set online/offline. */
1944 if (atomic_read(&cdev
->private->onoff
))
1947 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1948 return cdev
->drv
->prepare(cdev
);
1953 static void ccw_device_pm_complete(struct device
*dev
)
1955 struct ccw_device
*cdev
= to_ccwdev(dev
);
1957 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1958 cdev
->drv
->complete(cdev
);
1961 static int ccw_device_pm_freeze(struct device
*dev
)
1963 struct ccw_device
*cdev
= to_ccwdev(dev
);
1964 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1965 int ret
, cm_enabled
;
1967 /* Fail suspend while device is in transistional state. */
1968 if (!dev_fsm_final_state(cdev
))
1972 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1973 ret
= cdev
->drv
->freeze(cdev
);
1978 spin_lock_irq(sch
->lock
);
1979 cm_enabled
= cdev
->private->cmb
!= NULL
;
1980 spin_unlock_irq(sch
->lock
);
1982 /* Don't have the css write on memory. */
1983 ret
= ccw_set_cmf(cdev
, 0);
1987 /* From here on, disallow device driver I/O. */
1988 spin_lock_irq(sch
->lock
);
1989 ret
= cio_disable_subchannel(sch
);
1990 spin_unlock_irq(sch
->lock
);
1995 static int ccw_device_pm_thaw(struct device
*dev
)
1997 struct ccw_device
*cdev
= to_ccwdev(dev
);
1998 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1999 int ret
, cm_enabled
;
2004 spin_lock_irq(sch
->lock
);
2005 /* Allow device driver I/O again. */
2006 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
2007 cm_enabled
= cdev
->private->cmb
!= NULL
;
2008 spin_unlock_irq(sch
->lock
);
2013 ret
= ccw_set_cmf(cdev
, 1);
2018 if (cdev
->drv
&& cdev
->drv
->thaw
)
2019 ret
= cdev
->drv
->thaw(cdev
);
2024 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
2026 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2029 if (cio_is_console(sch
->schid
))
2032 * While we were sleeping, devices may have gone or become
2033 * available again. Kick re-detection.
2035 spin_lock_irq(sch
->lock
);
2036 cdev
->private->flags
.resuming
= 1;
2037 ret
= ccw_device_recognition(cdev
);
2038 spin_unlock_irq(sch
->lock
);
2040 CIO_MSG_EVENT(0, "Couldn't start recognition for device "
2041 "0.%x.%04x (ret=%d)\n",
2042 cdev
->private->dev_id
.ssid
,
2043 cdev
->private->dev_id
.devno
, ret
);
2044 spin_lock_irq(sch
->lock
);
2045 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
2046 spin_unlock_irq(sch
->lock
);
2047 /* notify driver after the resume cb */
2050 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
2051 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
2054 cdev
->private->flags
.resuming
= 0;
2057 static int resume_handle_boxed(struct ccw_device
*cdev
)
2059 cdev
->private->state
= DEV_STATE_BOXED
;
2060 if (ccw_device_notify(cdev
, CIO_BOXED
))
2062 ccw_device_schedule_sch_unregister(cdev
);
2066 static int resume_handle_disc(struct ccw_device
*cdev
)
2068 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
2069 if (ccw_device_notify(cdev
, CIO_GONE
))
2071 ccw_device_schedule_sch_unregister(cdev
);
2075 static int ccw_device_pm_restore(struct device
*dev
)
2077 struct ccw_device
*cdev
= to_ccwdev(dev
);
2078 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2079 int ret
= 0, cm_enabled
;
2081 __ccw_device_pm_restore(cdev
);
2082 spin_lock_irq(sch
->lock
);
2083 if (cio_is_console(sch
->schid
)) {
2084 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
2085 spin_unlock_irq(sch
->lock
);
2088 cdev
->private->flags
.donotify
= 0;
2089 /* check recognition results */
2090 switch (cdev
->private->state
) {
2091 case DEV_STATE_OFFLINE
:
2093 case DEV_STATE_BOXED
:
2094 ret
= resume_handle_boxed(cdev
);
2095 spin_unlock_irq(sch
->lock
);
2099 case DEV_STATE_DISCONNECTED
:
2100 goto out_disc_unlock
;
2102 goto out_unreg_unlock
;
2104 /* check if the device id has changed */
2105 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
2106 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
2107 "changed from %04x to %04x)\n",
2108 sch
->schid
.ssid
, sch
->schid
.sch_no
,
2109 cdev
->private->dev_id
.devno
,
2110 sch
->schib
.pmcw
.dev
);
2111 goto out_unreg_unlock
;
2113 /* check if the device type has changed */
2114 if (!ccw_device_test_sense_data(cdev
)) {
2115 ccw_device_update_sense_data(cdev
);
2116 PREPARE_WORK(&cdev
->private->kick_work
,
2117 ccw_device_do_unbind_bind
);
2118 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
2122 if (!cdev
->online
) {
2126 ret
= ccw_device_online(cdev
);
2128 goto out_disc_unlock
;
2130 cm_enabled
= cdev
->private->cmb
!= NULL
;
2131 spin_unlock_irq(sch
->lock
);
2133 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
2134 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
2135 spin_lock_irq(sch
->lock
);
2136 goto out_disc_unlock
;
2139 ret
= ccw_set_cmf(cdev
, 1);
2141 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
2142 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
2143 cdev
->private->dev_id
.devno
, ret
);
2149 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
2150 ret
= cdev
->drv
->restore(cdev
);
2155 ret
= resume_handle_disc(cdev
);
2156 spin_unlock_irq(sch
->lock
);
2162 ccw_device_schedule_sch_unregister(cdev
);
2165 spin_unlock_irq(sch
->lock
);
2169 static struct dev_pm_ops ccw_pm_ops
= {
2170 .prepare
= ccw_device_pm_prepare
,
2171 .complete
= ccw_device_pm_complete
,
2172 .freeze
= ccw_device_pm_freeze
,
2173 .thaw
= ccw_device_pm_thaw
,
2174 .restore
= ccw_device_pm_restore
,
2177 struct bus_type ccw_bus_type
= {
2179 .match
= ccw_bus_match
,
2180 .uevent
= ccw_uevent
,
2181 .probe
= ccw_device_probe
,
2182 .remove
= ccw_device_remove
,
2183 .shutdown
= ccw_device_shutdown
,
2188 * ccw_driver_register() - register a ccw driver
2189 * @cdriver: driver to be registered
2191 * This function is mainly a wrapper around driver_register().
2193 * %0 on success and a negative error value on failure.
2195 int ccw_driver_register(struct ccw_driver
*cdriver
)
2197 struct device_driver
*drv
= &cdriver
->driver
;
2199 drv
->bus
= &ccw_bus_type
;
2200 drv
->name
= cdriver
->name
;
2201 drv
->owner
= cdriver
->owner
;
2203 return driver_register(drv
);
2207 * ccw_driver_unregister() - deregister a ccw driver
2208 * @cdriver: driver to be deregistered
2210 * This function is mainly a wrapper around driver_unregister().
2212 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
2214 driver_unregister(&cdriver
->driver
);
2217 /* Helper func for qdio. */
2218 struct subchannel_id
2219 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
2221 struct subchannel
*sch
;
2223 sch
= to_subchannel(cdev
->dev
.parent
);
2227 MODULE_LICENSE("GPL");
2228 EXPORT_SYMBOL(ccw_device_set_online
);
2229 EXPORT_SYMBOL(ccw_device_set_offline
);
2230 EXPORT_SYMBOL(ccw_driver_register
);
2231 EXPORT_SYMBOL(ccw_driver_unregister
);
2232 EXPORT_SYMBOL(get_ccwdev_by_busid
);
2233 EXPORT_SYMBOL(ccw_bus_type
);
2234 EXPORT_SYMBOL(ccw_device_work
);
2235 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);