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 /* Get cdev reference for workqueue processing. */
337 if (!get_device(&cdev
->dev
))
339 if (ccw_device_is_orphan(cdev
)) {
341 * Deregister ccw device.
342 * Unfortunately, we cannot do this directly from the
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 ret
= ccw_device_offline(cdev
);
384 if (ret
== -ENODEV
) {
385 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
386 cdev
->private->state
= DEV_STATE_OFFLINE
;
387 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
389 spin_unlock_irq(cdev
->ccwlock
);
390 /* Give up reference from ccw_device_set_online(). */
391 put_device(&cdev
->dev
);
394 spin_unlock_irq(cdev
->ccwlock
);
396 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
397 /* Give up reference from ccw_device_set_online(). */
398 put_device(&cdev
->dev
);
400 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
401 "device 0.%x.%04x\n",
402 ret
, cdev
->private->dev_id
.ssid
,
403 cdev
->private->dev_id
.devno
);
410 * ccw_device_set_online() - enable a ccw device for I/O
411 * @cdev: target ccw device
413 * This function first enables @cdev and then calls the driver's set_online()
414 * function for @cdev, if given. If set_online() returns an error, @cdev is
417 * %0 on success and a negative error value on failure.
419 * enabled, ccw device lock not held
421 int ccw_device_set_online(struct ccw_device
*cdev
)
427 if (cdev
->online
|| !cdev
->drv
)
429 /* Hold on to an extra reference while device is online. */
430 if (!get_device(&cdev
->dev
))
433 spin_lock_irq(cdev
->ccwlock
);
434 ret
= ccw_device_online(cdev
);
435 spin_unlock_irq(cdev
->ccwlock
);
437 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
439 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
440 "device 0.%x.%04x\n",
441 ret
, cdev
->private->dev_id
.ssid
,
442 cdev
->private->dev_id
.devno
);
443 /* Give up online reference since onlining failed. */
444 put_device(&cdev
->dev
);
447 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
448 /* Give up online reference since onlining failed. */
449 put_device(&cdev
->dev
);
452 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
456 spin_lock_irq(cdev
->ccwlock
);
457 ret
= ccw_device_offline(cdev
);
458 spin_unlock_irq(cdev
->ccwlock
);
460 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
462 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
463 "device 0.%x.%04x\n",
464 ret
, cdev
->private->dev_id
.ssid
,
465 cdev
->private->dev_id
.devno
);
466 /* Give up online reference since onlining failed. */
467 put_device(&cdev
->dev
);
468 return (ret
== 0) ? -ENODEV
: ret
;
471 static int online_store_handle_offline(struct ccw_device
*cdev
)
473 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
474 ccw_device_remove_disconnected(cdev
);
475 else if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->set_offline
)
476 return ccw_device_set_offline(cdev
);
480 static int online_store_recog_and_online(struct ccw_device
*cdev
)
484 /* Do device recognition, if needed. */
485 if (cdev
->private->state
== DEV_STATE_BOXED
) {
486 ret
= ccw_device_recognition(cdev
);
488 CIO_MSG_EVENT(0, "Couldn't start recognition "
489 "for device 0.%x.%04x (ret=%d)\n",
490 cdev
->private->dev_id
.ssid
,
491 cdev
->private->dev_id
.devno
, ret
);
494 wait_event(cdev
->private->wait_q
,
495 cdev
->private->flags
.recog_done
);
496 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
497 /* recognition failed */
500 if (cdev
->drv
&& cdev
->drv
->set_online
)
501 ccw_device_set_online(cdev
);
505 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
509 ret
= online_store_recog_and_online(cdev
);
512 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
513 ret
= ccw_device_stlck(cdev
);
516 if (cdev
->id
.cu_type
== 0)
517 cdev
->private->state
= DEV_STATE_NOT_OPER
;
518 ret
= online_store_recog_and_online(cdev
);
525 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
526 const char *buf
, size_t count
)
528 struct ccw_device
*cdev
= to_ccwdev(dev
);
532 if ((cdev
->private->state
!= DEV_STATE_OFFLINE
&&
533 cdev
->private->state
!= DEV_STATE_ONLINE
&&
534 cdev
->private->state
!= DEV_STATE_BOXED
&&
535 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) ||
536 atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
539 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
540 atomic_set(&cdev
->private->onoff
, 0);
543 if (!strncmp(buf
, "force\n", count
)) {
549 ret
= strict_strtoul(buf
, 16, &i
);
555 ret
= online_store_handle_offline(cdev
);
558 ret
= online_store_handle_online(cdev
, force
);
565 module_put(cdev
->drv
->owner
);
566 atomic_set(&cdev
->private->onoff
, 0);
567 return (ret
< 0) ? ret
: count
;
571 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
573 struct ccw_device
*cdev
= to_ccwdev(dev
);
574 struct subchannel
*sch
;
576 if (ccw_device_is_orphan(cdev
))
577 return sprintf(buf
, "no device\n");
578 switch (cdev
->private->state
) {
579 case DEV_STATE_BOXED
:
580 return sprintf(buf
, "boxed\n");
581 case DEV_STATE_DISCONNECTED
:
582 case DEV_STATE_DISCONNECTED_SENSE_ID
:
583 case DEV_STATE_NOT_OPER
:
584 sch
= to_subchannel(dev
->parent
);
586 return sprintf(buf
, "no path\n");
588 return sprintf(buf
, "no device\n");
590 /* All other states considered fine. */
591 return sprintf(buf
, "good\n");
595 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
596 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
597 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
598 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
599 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
600 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
601 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
603 static struct attribute
*io_subchannel_attrs
[] = {
604 &dev_attr_chpids
.attr
,
605 &dev_attr_pimpampom
.attr
,
609 static struct attribute_group io_subchannel_attr_group
= {
610 .attrs
= io_subchannel_attrs
,
613 static struct attribute
* ccwdev_attrs
[] = {
614 &dev_attr_devtype
.attr
,
615 &dev_attr_cutype
.attr
,
616 &dev_attr_modalias
.attr
,
617 &dev_attr_online
.attr
,
618 &dev_attr_cmb_enable
.attr
,
619 &dev_attr_availability
.attr
,
623 static struct attribute_group ccwdev_attr_group
= {
624 .attrs
= ccwdev_attrs
,
627 static struct attribute_group
*ccwdev_attr_groups
[] = {
632 /* this is a simple abstraction for device_register that sets the
633 * correct bus type and adds the bus specific files */
634 static int ccw_device_register(struct ccw_device
*cdev
)
636 struct device
*dev
= &cdev
->dev
;
639 dev
->bus
= &ccw_bus_type
;
641 if ((ret
= device_add(dev
)))
644 set_bit(1, &cdev
->private->registered
);
649 struct ccw_dev_id dev_id
;
650 struct ccw_device
* sibling
;
654 match_devno(struct device
* dev
, void * data
)
656 struct match_data
* d
= data
;
657 struct ccw_device
* cdev
;
659 cdev
= to_ccwdev(dev
);
660 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
661 !ccw_device_is_orphan(cdev
) &&
662 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
663 (cdev
!= d
->sibling
))
668 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
669 struct ccw_device
*sibling
)
672 struct match_data data
;
674 data
.dev_id
= *dev_id
;
675 data
.sibling
= sibling
;
676 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
678 return dev
? to_ccwdev(dev
) : NULL
;
681 static int match_orphan(struct device
*dev
, void *data
)
683 struct ccw_dev_id
*dev_id
;
684 struct ccw_device
*cdev
;
687 cdev
= to_ccwdev(dev
);
688 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
691 static struct ccw_device
*
692 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
693 struct ccw_dev_id
*dev_id
)
697 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
700 return dev
? to_ccwdev(dev
) : NULL
;
703 void ccw_device_do_unbind_bind(struct work_struct
*work
)
705 struct ccw_device_private
*priv
;
706 struct ccw_device
*cdev
;
707 struct subchannel
*sch
;
710 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
712 sch
= to_subchannel(cdev
->dev
.parent
);
714 if (test_bit(1, &cdev
->private->registered
)) {
715 device_release_driver(&cdev
->dev
);
716 ret
= device_attach(&cdev
->dev
);
717 WARN_ON(ret
== -ENODEV
);
722 ccw_device_release(struct device
*dev
)
724 struct ccw_device
*cdev
;
726 cdev
= to_ccwdev(dev
);
727 /* Release reference of parent subchannel. */
728 put_device(cdev
->dev
.parent
);
729 kfree(cdev
->private);
733 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
735 struct ccw_device
*cdev
;
737 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
739 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
740 GFP_KERNEL
| GFP_DMA
);
745 return ERR_PTR(-ENOMEM
);
748 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
749 struct ccw_device
*cdev
)
751 cdev
->private->cdev
= cdev
;
752 atomic_set(&cdev
->private->onoff
, 0);
753 cdev
->dev
.parent
= &sch
->dev
;
754 cdev
->dev
.release
= ccw_device_release
;
755 INIT_WORK(&cdev
->private->kick_work
, NULL
);
756 cdev
->dev
.groups
= ccwdev_attr_groups
;
757 /* Do first half of device_register. */
758 device_initialize(&cdev
->dev
);
759 if (!get_device(&sch
->dev
)) {
760 /* Release reference from device_initialize(). */
761 put_device(&cdev
->dev
);
767 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
769 struct ccw_device
*cdev
;
772 cdev
= io_subchannel_allocate_dev(sch
);
774 ret
= io_subchannel_initialize_dev(sch
, cdev
);
781 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
783 static void sch_attach_device(struct subchannel
*sch
,
784 struct ccw_device
*cdev
)
786 css_update_ssd_info(sch
);
787 spin_lock_irq(sch
->lock
);
788 sch_set_cdev(sch
, cdev
);
789 cdev
->private->schid
= sch
->schid
;
790 cdev
->ccwlock
= sch
->lock
;
791 ccw_device_trigger_reprobe(cdev
);
792 spin_unlock_irq(sch
->lock
);
795 static void sch_attach_disconnected_device(struct subchannel
*sch
,
796 struct ccw_device
*cdev
)
798 struct subchannel
*other_sch
;
801 /* Get reference for new parent. */
802 if (!get_device(&sch
->dev
))
804 other_sch
= to_subchannel(cdev
->dev
.parent
);
805 /* Note: device_move() changes cdev->dev.parent */
806 ret
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
808 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
809 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
810 cdev
->private->dev_id
.devno
, ret
);
811 /* Put reference for new parent. */
812 put_device(&sch
->dev
);
815 sch_set_cdev(other_sch
, NULL
);
816 /* No need to keep a subchannel without ccw device around. */
817 css_sch_device_unregister(other_sch
);
818 sch_attach_device(sch
, cdev
);
819 /* Put reference for old parent. */
820 put_device(&other_sch
->dev
);
823 static void sch_attach_orphaned_device(struct subchannel
*sch
,
824 struct ccw_device
*cdev
)
827 struct subchannel
*pseudo_sch
;
829 /* Get reference for new parent. */
830 if (!get_device(&sch
->dev
))
832 pseudo_sch
= to_subchannel(cdev
->dev
.parent
);
834 * Try to move the ccw device to its new subchannel.
835 * Note: device_move() changes cdev->dev.parent
837 ret
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
839 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
840 "failed (ret=%d)!\n",
841 cdev
->private->dev_id
.ssid
,
842 cdev
->private->dev_id
.devno
, ret
);
843 /* Put reference for new parent. */
844 put_device(&sch
->dev
);
847 sch_attach_device(sch
, cdev
);
848 /* Put reference on pseudo subchannel. */
849 put_device(&pseudo_sch
->dev
);
852 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
854 struct ccw_device
*cdev
;
856 /* Need to allocate a new ccw device. */
857 cdev
= io_subchannel_create_ccwdev(sch
);
859 /* OK, we did everything we could... */
860 css_sch_device_unregister(sch
);
863 spin_lock_irq(sch
->lock
);
864 sch_set_cdev(sch
, cdev
);
865 spin_unlock_irq(sch
->lock
);
866 /* Start recognition for the new ccw device. */
867 if (io_subchannel_recog(cdev
, sch
)) {
868 spin_lock_irq(sch
->lock
);
869 sch_set_cdev(sch
, NULL
);
870 spin_unlock_irq(sch
->lock
);
871 css_sch_device_unregister(sch
);
872 /* Put reference from io_subchannel_create_ccwdev(). */
873 put_device(&sch
->dev
);
874 /* Give up initial reference. */
875 put_device(&cdev
->dev
);
880 void ccw_device_move_to_orphanage(struct work_struct
*work
)
882 struct ccw_device_private
*priv
;
883 struct ccw_device
*cdev
;
884 struct ccw_device
*replacing_cdev
;
885 struct subchannel
*sch
;
887 struct channel_subsystem
*css
;
888 struct ccw_dev_id dev_id
;
890 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
892 sch
= to_subchannel(cdev
->dev
.parent
);
893 css
= to_css(sch
->dev
.parent
);
894 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
895 dev_id
.ssid
= sch
->schid
.ssid
;
897 /* Increase refcount for pseudo subchannel. */
898 get_device(&css
->pseudo_subchannel
->dev
);
900 * Move the orphaned ccw device to the orphanage so the replacing
901 * ccw device can take its place on the subchannel.
902 * Note: device_move() changes cdev->dev.parent
904 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
,
907 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
908 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
909 cdev
->private->dev_id
.devno
, ret
);
910 /* Decrease refcount for pseudo subchannel again. */
911 put_device(&css
->pseudo_subchannel
->dev
);
914 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
916 * Search for the replacing ccw device
917 * - among the disconnected devices
920 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
921 if (replacing_cdev
) {
922 sch_attach_disconnected_device(sch
, replacing_cdev
);
923 /* Release reference from get_disc_ccwdev_by_dev_id() */
924 put_device(&replacing_cdev
->dev
);
925 /* Release reference of subchannel from old cdev. */
926 put_device(&sch
->dev
);
929 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
930 if (replacing_cdev
) {
931 sch_attach_orphaned_device(sch
, replacing_cdev
);
932 /* Release reference from get_orphaned_ccwdev_by_dev_id() */
933 put_device(&replacing_cdev
->dev
);
934 /* Release reference of subchannel from old cdev. */
935 put_device(&sch
->dev
);
938 sch_create_and_recog_new_device(sch
);
939 /* Release reference of subchannel from old cdev. */
940 put_device(&sch
->dev
);
944 * Register recognized device.
947 io_subchannel_register(struct work_struct
*work
)
949 struct ccw_device_private
*priv
;
950 struct ccw_device
*cdev
;
951 struct subchannel
*sch
;
955 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
957 sch
= to_subchannel(cdev
->dev
.parent
);
959 * Check if subchannel is still registered. It may have become
960 * unregistered if a machine check hit us after finishing
961 * device recognition but before the register work could be
964 if (!device_is_registered(&sch
->dev
))
966 css_update_ssd_info(sch
);
968 * io_subchannel_register() will also be called after device
969 * recognition has been done for a boxed device (which will already
970 * be registered). We need to reprobe since we may now have sense id
973 if (device_is_registered(&cdev
->dev
)) {
975 ret
= device_reprobe(&cdev
->dev
);
977 /* We can't do much here. */
978 CIO_MSG_EVENT(0, "device_reprobe() returned"
979 " %d for 0.%x.%04x\n", ret
,
980 cdev
->private->dev_id
.ssid
,
981 cdev
->private->dev_id
.devno
);
986 * Now we know this subchannel will stay, we can throw
987 * our delayed uevent.
989 dev_set_uevent_suppress(&sch
->dev
, 0);
990 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
991 /* make it known to the system */
992 ret
= ccw_device_register(cdev
);
994 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
995 cdev
->private->dev_id
.ssid
,
996 cdev
->private->dev_id
.devno
, ret
);
997 spin_lock_irqsave(sch
->lock
, flags
);
998 sch_set_cdev(sch
, NULL
);
999 spin_unlock_irqrestore(sch
->lock
, flags
);
1000 /* Release initial device reference. */
1001 put_device(&cdev
->dev
);
1005 cdev
->private->flags
.recog_done
= 1;
1006 wake_up(&cdev
->private->wait_q
);
1008 /* Release reference for workqueue processing. */
1009 put_device(&cdev
->dev
);
1010 if (atomic_dec_and_test(&ccw_device_init_count
))
1011 wake_up(&ccw_device_init_wq
);
1014 static void ccw_device_call_sch_unregister(struct work_struct
*work
)
1016 struct ccw_device_private
*priv
;
1017 struct ccw_device
*cdev
;
1018 struct subchannel
*sch
;
1020 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1022 /* Get subchannel reference for local processing. */
1023 if (!get_device(cdev
->dev
.parent
))
1025 sch
= to_subchannel(cdev
->dev
.parent
);
1026 css_sch_device_unregister(sch
);
1027 /* Reset intparm to zeroes. */
1028 sch
->config
.intparm
= 0;
1029 cio_commit_config(sch
);
1030 /* Release cdev reference for workqueue processing.*/
1031 put_device(&cdev
->dev
);
1032 /* Release subchannel reference for local processing. */
1033 put_device(&sch
->dev
);
1036 void ccw_device_schedule_sch_unregister(struct ccw_device
*cdev
)
1038 PREPARE_WORK(&cdev
->private->kick_work
,
1039 ccw_device_call_sch_unregister
);
1040 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1044 * subchannel recognition done. Called from the state machine.
1047 io_subchannel_recog_done(struct ccw_device
*cdev
)
1049 if (css_init_done
== 0) {
1050 cdev
->private->flags
.recog_done
= 1;
1053 switch (cdev
->private->state
) {
1054 case DEV_STATE_BOXED
:
1055 /* Device did not respond in time. */
1056 case DEV_STATE_NOT_OPER
:
1057 cdev
->private->flags
.recog_done
= 1;
1058 /* Remove device found not operational. */
1059 if (!get_device(&cdev
->dev
))
1061 ccw_device_schedule_sch_unregister(cdev
);
1062 if (atomic_dec_and_test(&ccw_device_init_count
))
1063 wake_up(&ccw_device_init_wq
);
1065 case DEV_STATE_OFFLINE
:
1067 * We can't register the device in interrupt context so
1068 * we schedule a work item.
1070 if (!get_device(&cdev
->dev
))
1072 PREPARE_WORK(&cdev
->private->kick_work
,
1073 io_subchannel_register
);
1074 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1080 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
1083 struct ccw_device_private
*priv
;
1085 sch_set_cdev(sch
, cdev
);
1086 cdev
->ccwlock
= sch
->lock
;
1088 /* Init private data. */
1089 priv
= cdev
->private;
1090 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1091 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
1092 priv
->schid
= sch
->schid
;
1093 priv
->state
= DEV_STATE_NOT_OPER
;
1094 INIT_LIST_HEAD(&priv
->cmb_list
);
1095 init_waitqueue_head(&priv
->wait_q
);
1096 init_timer(&priv
->timer
);
1098 /* Set an initial name for the device. */
1099 if (cio_is_console(sch
->schid
))
1100 cdev
->dev
.init_name
= cio_get_console_cdev_name(sch
);
1102 dev_set_name(&cdev
->dev
, "0.%x.%04x",
1103 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1105 /* Increase counter of devices currently in recognition. */
1106 atomic_inc(&ccw_device_init_count
);
1108 /* Start async. device sensing. */
1109 spin_lock_irq(sch
->lock
);
1110 rc
= ccw_device_recognition(cdev
);
1111 spin_unlock_irq(sch
->lock
);
1113 if (atomic_dec_and_test(&ccw_device_init_count
))
1114 wake_up(&ccw_device_init_wq
);
1119 static void ccw_device_move_to_sch(struct work_struct
*work
)
1121 struct ccw_device_private
*priv
;
1123 struct subchannel
*sch
;
1124 struct ccw_device
*cdev
;
1125 struct subchannel
*former_parent
;
1127 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1130 former_parent
= to_subchannel(cdev
->dev
.parent
);
1131 /* Get reference for new parent. */
1132 if (!get_device(&sch
->dev
))
1134 mutex_lock(&sch
->reg_mutex
);
1136 * Try to move the ccw device to its new subchannel.
1137 * Note: device_move() changes cdev->dev.parent
1139 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
1140 mutex_unlock(&sch
->reg_mutex
);
1142 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1143 "0.%x.%04x failed (ret=%d)!\n",
1144 cdev
->private->dev_id
.ssid
,
1145 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1146 sch
->schid
.sch_no
, rc
);
1147 css_sch_device_unregister(sch
);
1148 /* Put reference for new parent again. */
1149 put_device(&sch
->dev
);
1152 if (!sch_is_pseudo_sch(former_parent
)) {
1153 spin_lock_irq(former_parent
->lock
);
1154 sch_set_cdev(former_parent
, NULL
);
1155 spin_unlock_irq(former_parent
->lock
);
1156 css_sch_device_unregister(former_parent
);
1157 /* Reset intparm to zeroes. */
1158 former_parent
->config
.intparm
= 0;
1159 cio_commit_config(former_parent
);
1161 sch_attach_device(sch
, cdev
);
1163 /* Put reference for old parent. */
1164 put_device(&former_parent
->dev
);
1165 put_device(&cdev
->dev
);
1168 static void io_subchannel_irq(struct subchannel
*sch
)
1170 struct ccw_device
*cdev
;
1172 cdev
= sch_get_cdev(sch
);
1174 CIO_TRACE_EVENT(3, "IRQ");
1175 CIO_TRACE_EVENT(3, dev_name(&sch
->dev
));
1177 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1180 void io_subchannel_init_config(struct subchannel
*sch
)
1182 memset(&sch
->config
, 0, sizeof(sch
->config
));
1183 sch
->config
.csense
= 1;
1184 /* Use subchannel mp mode when there is more than 1 installed CHPID. */
1185 if ((sch
->schib
.pmcw
.pim
& (sch
->schib
.pmcw
.pim
- 1)) != 0)
1189 static void io_subchannel_init_fields(struct subchannel
*sch
)
1191 if (cio_is_console(sch
->schid
))
1194 sch
->opm
= chp_get_sch_opm(sch
);
1195 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1196 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1198 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1199 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1200 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1201 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1202 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1204 io_subchannel_init_config(sch
);
1207 static void io_subchannel_do_unreg(struct work_struct
*work
)
1209 struct subchannel
*sch
;
1211 sch
= container_of(work
, struct subchannel
, work
);
1212 css_sch_device_unregister(sch
);
1213 /* Reset intparm to zeroes. */
1214 sch
->config
.intparm
= 0;
1215 cio_commit_config(sch
);
1216 put_device(&sch
->dev
);
1219 /* Schedule unregister if we have no cdev. */
1220 static void io_subchannel_schedule_removal(struct subchannel
*sch
)
1222 get_device(&sch
->dev
);
1223 INIT_WORK(&sch
->work
, io_subchannel_do_unreg
);
1224 queue_work(slow_path_wq
, &sch
->work
);
1228 * Note: We always return 0 so that we bind to the device even on error.
1229 * This is needed so that our remove function is called on unregister.
1231 static int io_subchannel_probe(struct subchannel
*sch
)
1233 struct ccw_device
*cdev
;
1235 unsigned long flags
;
1236 struct ccw_dev_id dev_id
;
1238 cdev
= sch_get_cdev(sch
);
1240 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1241 &io_subchannel_attr_group
);
1243 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1244 "attributes for subchannel "
1245 "0.%x.%04x (rc=%d)\n",
1246 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1248 * This subchannel already has an associated ccw_device.
1249 * Throw the delayed uevent for the subchannel, register
1250 * the ccw_device and exit. This happens for all early
1251 * devices, e.g. the console.
1253 dev_set_uevent_suppress(&sch
->dev
, 0);
1254 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1255 cdev
->dev
.groups
= ccwdev_attr_groups
;
1256 device_initialize(&cdev
->dev
);
1257 ccw_device_register(cdev
);
1259 * Check if the device is already online. If it is
1260 * the reference count needs to be corrected since we
1261 * didn't obtain a reference in ccw_device_set_online.
1263 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1264 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1265 cdev
->private->state
!= DEV_STATE_BOXED
)
1266 get_device(&cdev
->dev
);
1269 io_subchannel_init_fields(sch
);
1270 rc
= cio_commit_config(sch
);
1273 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1274 &io_subchannel_attr_group
);
1277 /* Allocate I/O subchannel private data. */
1278 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1279 GFP_KERNEL
| GFP_DMA
);
1283 * First check if a fitting device may be found amongst the
1284 * disconnected devices or in the orphanage.
1286 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1287 dev_id
.ssid
= sch
->schid
.ssid
;
1288 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1290 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1294 * Schedule moving the device until when we have a registered
1295 * subchannel to move to and succeed the probe. We can
1296 * unregister later again, when the probe is through.
1298 cdev
->private->sch
= sch
;
1299 PREPARE_WORK(&cdev
->private->kick_work
,
1300 ccw_device_move_to_sch
);
1301 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1304 cdev
= io_subchannel_create_ccwdev(sch
);
1307 rc
= io_subchannel_recog(cdev
, sch
);
1309 spin_lock_irqsave(sch
->lock
, flags
);
1310 io_subchannel_recog_done(cdev
);
1311 spin_unlock_irqrestore(sch
->lock
, flags
);
1315 kfree(sch
->private);
1316 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1318 io_subchannel_schedule_removal(sch
);
1323 io_subchannel_remove (struct subchannel
*sch
)
1325 struct ccw_device
*cdev
;
1326 unsigned long flags
;
1328 cdev
= sch_get_cdev(sch
);
1331 /* Set ccw device to not operational and drop reference. */
1332 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1333 sch_set_cdev(sch
, NULL
);
1334 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1335 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1336 ccw_device_unregister(cdev
);
1337 put_device(&cdev
->dev
);
1338 kfree(sch
->private);
1339 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1343 static int io_subchannel_notify(struct subchannel
*sch
, int event
)
1345 struct ccw_device
*cdev
;
1347 cdev
= sch_get_cdev(sch
);
1350 return ccw_device_notify(cdev
, event
);
1353 static void io_subchannel_verify(struct subchannel
*sch
)
1355 struct ccw_device
*cdev
;
1357 cdev
= sch_get_cdev(sch
);
1359 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1362 static int check_for_io_on_path(struct subchannel
*sch
, int mask
)
1364 if (cio_update_schib(sch
))
1366 if (scsw_actl(&sch
->schib
.scsw
) && sch
->schib
.pmcw
.lpum
== mask
)
1371 static void terminate_internal_io(struct subchannel
*sch
,
1372 struct ccw_device
*cdev
)
1374 if (cio_clear(sch
)) {
1375 /* Recheck device in case clear failed. */
1378 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1380 css_schedule_eval(sch
->schid
);
1383 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1384 /* Request retry of internal operation. */
1385 cdev
->private->flags
.intretry
= 1;
1388 cdev
->handler(cdev
, cdev
->private->intparm
,
1392 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1394 struct ccw_device
*cdev
;
1396 cdev
= sch_get_cdev(sch
);
1399 if (check_for_io_on_path(sch
, mask
)) {
1400 if (cdev
->private->state
== DEV_STATE_ONLINE
)
1401 ccw_device_kill_io(cdev
);
1403 terminate_internal_io(sch
, cdev
);
1404 /* Re-start path verification. */
1405 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1408 /* trigger path verification. */
1409 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1413 static int io_subchannel_chp_event(struct subchannel
*sch
,
1414 struct chp_link
*link
, int event
)
1418 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1425 io_subchannel_terminate_path(sch
, mask
);
1430 io_subchannel_verify(sch
);
1433 if (cio_update_schib(sch
))
1435 io_subchannel_terminate_path(sch
, mask
);
1438 if (cio_update_schib(sch
))
1440 sch
->lpm
|= mask
& sch
->opm
;
1441 io_subchannel_verify(sch
);
1448 io_subchannel_shutdown(struct subchannel
*sch
)
1450 struct ccw_device
*cdev
;
1453 cdev
= sch_get_cdev(sch
);
1455 if (cio_is_console(sch
->schid
))
1457 if (!sch
->schib
.pmcw
.ena
)
1458 /* Nothing to do. */
1460 ret
= cio_disable_subchannel(sch
);
1462 /* Subchannel is disabled, we're done. */
1464 cdev
->private->state
= DEV_STATE_QUIESCE
;
1466 cdev
->handler(cdev
, cdev
->private->intparm
,
1468 ret
= ccw_device_cancel_halt_clear(cdev
);
1469 if (ret
== -EBUSY
) {
1470 ccw_device_set_timeout(cdev
, HZ
/10);
1471 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1473 cio_disable_subchannel(sch
);
1476 static int io_subchannel_get_status(struct subchannel
*sch
)
1480 if (stsch(sch
->schid
, &schib
) || !schib
.pmcw
.dnv
)
1482 if (sch
->schib
.pmcw
.dnv
&& (schib
.pmcw
.dev
!= sch
->schib
.pmcw
.dev
))
1483 return CIO_REVALIDATE
;
1489 static int device_is_disconnected(struct ccw_device
*cdev
)
1493 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1494 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1497 static int recovery_check(struct device
*dev
, void *data
)
1499 struct ccw_device
*cdev
= to_ccwdev(dev
);
1502 spin_lock_irq(cdev
->ccwlock
);
1503 switch (cdev
->private->state
) {
1504 case DEV_STATE_DISCONNECTED
:
1505 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1506 cdev
->private->dev_id
.ssid
,
1507 cdev
->private->dev_id
.devno
);
1508 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1511 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1515 spin_unlock_irq(cdev
->ccwlock
);
1520 static void recovery_work_func(struct work_struct
*unused
)
1524 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1526 spin_lock_irq(&recovery_lock
);
1527 if (!timer_pending(&recovery_timer
)) {
1528 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1530 mod_timer(&recovery_timer
, jiffies
+
1531 recovery_delay
[recovery_phase
] * HZ
);
1533 spin_unlock_irq(&recovery_lock
);
1535 CIO_MSG_EVENT(4, "recovery: end\n");
1538 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1540 static void recovery_func(unsigned long data
)
1543 * We can't do our recovery in softirq context and it's not
1544 * performance critical, so we schedule it.
1546 schedule_work(&recovery_work
);
1549 static void ccw_device_schedule_recovery(void)
1551 unsigned long flags
;
1553 CIO_MSG_EVENT(4, "recovery: schedule\n");
1554 spin_lock_irqsave(&recovery_lock
, flags
);
1555 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1557 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1559 spin_unlock_irqrestore(&recovery_lock
, flags
);
1562 static int purge_fn(struct device
*dev
, void *data
)
1564 struct ccw_device
*cdev
= to_ccwdev(dev
);
1565 struct ccw_device_private
*priv
= cdev
->private;
1568 spin_lock_irq(cdev
->ccwlock
);
1569 unreg
= is_blacklisted(priv
->dev_id
.ssid
, priv
->dev_id
.devno
) &&
1570 (priv
->state
== DEV_STATE_OFFLINE
);
1571 spin_unlock_irq(cdev
->ccwlock
);
1574 if (!get_device(&cdev
->dev
))
1576 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv
->dev_id
.ssid
,
1577 priv
->dev_id
.devno
);
1578 ccw_device_schedule_sch_unregister(cdev
);
1581 /* Abort loop in case of pending signal. */
1582 if (signal_pending(current
))
1589 * ccw_purge_blacklisted - purge unused, blacklisted devices
1591 * Unregister all ccw devices that are offline and on the blacklist.
1593 int ccw_purge_blacklisted(void)
1595 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1596 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1600 static void device_set_disconnected(struct ccw_device
*cdev
)
1604 ccw_device_set_timeout(cdev
, 0);
1605 cdev
->private->flags
.fake_irb
= 0;
1606 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1608 ccw_device_schedule_recovery();
1611 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1613 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1615 CIO_TRACE_EVENT(2, "notoper");
1616 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1617 ccw_device_set_timeout(cdev
, 0);
1618 cio_disable_subchannel(sch
);
1619 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1622 static int io_subchannel_sch_event(struct subchannel
*sch
, int slow
)
1624 int event
, ret
, disc
;
1625 unsigned long flags
;
1626 enum { NONE
, UNREGISTER
, UNREGISTER_PROBE
, REPROBE
, DISC
} action
;
1627 struct ccw_device
*cdev
;
1629 spin_lock_irqsave(sch
->lock
, flags
);
1630 cdev
= sch_get_cdev(sch
);
1631 disc
= device_is_disconnected(cdev
);
1633 /* Disconnected devices are evaluated directly only.*/
1634 spin_unlock_irqrestore(sch
->lock
, flags
);
1637 /* No interrupt after machine check - kill pending timers. */
1639 ccw_device_set_timeout(cdev
, 0);
1640 if (!disc
&& !slow
) {
1641 /* Non-disconnected devices are evaluated on the slow path. */
1642 spin_unlock_irqrestore(sch
->lock
, flags
);
1645 event
= io_subchannel_get_status(sch
);
1646 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1647 sch
->schid
.ssid
, sch
->schid
.sch_no
, event
,
1648 disc
? "disconnected" : "normal",
1649 slow
? "slow" : "fast");
1650 /* Analyze subchannel status. */
1655 /* Check if paths have become available. */
1661 /* Ask driver what to do with device. */
1662 if (io_subchannel_notify(sch
, event
))
1665 action
= UNREGISTER
;
1667 case CIO_REVALIDATE
:
1668 /* Device will be removed, so no notify necessary. */
1670 /* Reprobe because immediate unregister might block. */
1673 action
= UNREGISTER_PROBE
;
1677 /* Get device operational again. */
1681 /* Perform action. */
1685 case UNREGISTER_PROBE
:
1686 ccw_device_set_notoper(cdev
);
1687 /* Unregister device (will use subchannel lock). */
1688 spin_unlock_irqrestore(sch
->lock
, flags
);
1689 css_sch_device_unregister(sch
);
1690 spin_lock_irqsave(sch
->lock
, flags
);
1692 /* Reset intparm to zeroes. */
1693 sch
->config
.intparm
= 0;
1694 cio_commit_config(sch
);
1697 ccw_device_trigger_reprobe(cdev
);
1700 device_set_disconnected(cdev
);
1705 spin_unlock_irqrestore(sch
->lock
, flags
);
1706 /* Probe if necessary. */
1707 if (action
== UNREGISTER_PROBE
)
1708 ret
= css_probe_device(sch
->schid
);
1713 #ifdef CONFIG_CCW_CONSOLE
1714 static struct ccw_device console_cdev
;
1715 static char console_cdev_name
[10] = "0.x.xxxx";
1716 static struct ccw_device_private console_private
;
1717 static int console_cdev_in_use
;
1719 static DEFINE_SPINLOCK(ccw_console_lock
);
1721 spinlock_t
* cio_get_console_lock(void)
1723 return &ccw_console_lock
;
1726 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1727 struct subchannel
*sch
)
1731 /* Attach subchannel private data. */
1732 sch
->private = cio_get_console_priv();
1733 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1734 io_subchannel_init_fields(sch
);
1735 rc
= cio_commit_config(sch
);
1738 sch
->driver
= &io_subchannel_driver
;
1739 /* Initialize the ccw_device structure. */
1740 cdev
->dev
.parent
= &sch
->dev
;
1741 rc
= io_subchannel_recog(cdev
, sch
);
1745 /* Now wait for the async. recognition to come to an end. */
1746 spin_lock_irq(cdev
->ccwlock
);
1747 while (!dev_fsm_final_state(cdev
))
1750 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1752 ccw_device_online(cdev
);
1753 while (!dev_fsm_final_state(cdev
))
1755 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1759 spin_unlock_irq(cdev
->ccwlock
);
1764 ccw_device_probe_console(void)
1766 struct subchannel
*sch
;
1769 if (xchg(&console_cdev_in_use
, 1) != 0)
1770 return ERR_PTR(-EBUSY
);
1771 sch
= cio_probe_console();
1773 console_cdev_in_use
= 0;
1774 return (void *) sch
;
1776 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1777 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1778 console_cdev
.private = &console_private
;
1779 console_private
.cdev
= &console_cdev
;
1780 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1782 cio_release_console();
1783 console_cdev_in_use
= 0;
1784 return ERR_PTR(ret
);
1786 console_cdev
.online
= 1;
1787 return &console_cdev
;
1790 static int ccw_device_pm_restore(struct device
*dev
);
1792 int ccw_device_force_console(void)
1794 if (!console_cdev_in_use
)
1796 return ccw_device_pm_restore(&console_cdev
.dev
);
1798 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1800 const char *cio_get_console_cdev_name(struct subchannel
*sch
)
1802 snprintf(console_cdev_name
, 10, "0.%x.%04x",
1803 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1804 return (const char *)console_cdev_name
;
1809 * get ccw_device matching the busid, but only if owned by cdrv
1812 __ccwdev_check_busid(struct device
*dev
, void *id
)
1818 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1823 * get_ccwdev_by_busid() - obtain device from a bus id
1824 * @cdrv: driver the device is owned by
1825 * @bus_id: bus id of the device to be searched
1827 * This function searches all devices owned by @cdrv for a device with a bus
1828 * id matching @bus_id.
1830 * If a match is found, its reference count of the found device is increased
1831 * and it is returned; else %NULL is returned.
1833 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1837 struct device_driver
*drv
;
1839 drv
= get_driver(&cdrv
->driver
);
1843 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1844 __ccwdev_check_busid
);
1847 return dev
? to_ccwdev(dev
) : NULL
;
1850 /************************** device driver handling ************************/
1852 /* This is the implementation of the ccw_driver class. The probe, remove
1853 * and release methods are initially very similar to the device_driver
1854 * implementations, with the difference that they have ccw_device
1857 * A ccw driver also contains the information that is needed for
1861 ccw_device_probe (struct device
*dev
)
1863 struct ccw_device
*cdev
= to_ccwdev(dev
);
1864 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1867 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1869 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1880 ccw_device_remove (struct device
*dev
)
1882 struct ccw_device
*cdev
= to_ccwdev(dev
);
1883 struct ccw_driver
*cdrv
= cdev
->drv
;
1890 spin_lock_irq(cdev
->ccwlock
);
1891 ret
= ccw_device_offline(cdev
);
1892 spin_unlock_irq(cdev
->ccwlock
);
1894 wait_event(cdev
->private->wait_q
,
1895 dev_fsm_final_state(cdev
));
1897 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1898 "device 0.%x.%04x\n",
1899 ret
, cdev
->private->dev_id
.ssid
,
1900 cdev
->private->dev_id
.devno
);
1901 /* Give up reference obtained in ccw_device_set_online(). */
1902 put_device(&cdev
->dev
);
1904 ccw_device_set_timeout(cdev
, 0);
1909 static void ccw_device_shutdown(struct device
*dev
)
1911 struct ccw_device
*cdev
;
1913 cdev
= to_ccwdev(dev
);
1914 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1915 cdev
->drv
->shutdown(cdev
);
1919 static int ccw_device_pm_prepare(struct device
*dev
)
1921 struct ccw_device
*cdev
= to_ccwdev(dev
);
1923 if (work_pending(&cdev
->private->kick_work
))
1925 /* Fail while device is being set online/offline. */
1926 if (atomic_read(&cdev
->private->onoff
))
1929 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1930 return cdev
->drv
->prepare(cdev
);
1935 static void ccw_device_pm_complete(struct device
*dev
)
1937 struct ccw_device
*cdev
= to_ccwdev(dev
);
1939 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1940 cdev
->drv
->complete(cdev
);
1943 static int ccw_device_pm_freeze(struct device
*dev
)
1945 struct ccw_device
*cdev
= to_ccwdev(dev
);
1946 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1947 int ret
, cm_enabled
;
1949 /* Fail suspend while device is in transistional state. */
1950 if (!dev_fsm_final_state(cdev
))
1954 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1955 ret
= cdev
->drv
->freeze(cdev
);
1960 spin_lock_irq(sch
->lock
);
1961 cm_enabled
= cdev
->private->cmb
!= NULL
;
1962 spin_unlock_irq(sch
->lock
);
1964 /* Don't have the css write on memory. */
1965 ret
= ccw_set_cmf(cdev
, 0);
1969 /* From here on, disallow device driver I/O. */
1970 spin_lock_irq(sch
->lock
);
1971 ret
= cio_disable_subchannel(sch
);
1972 spin_unlock_irq(sch
->lock
);
1977 static int ccw_device_pm_thaw(struct device
*dev
)
1979 struct ccw_device
*cdev
= to_ccwdev(dev
);
1980 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1981 int ret
, cm_enabled
;
1986 spin_lock_irq(sch
->lock
);
1987 /* Allow device driver I/O again. */
1988 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1989 cm_enabled
= cdev
->private->cmb
!= NULL
;
1990 spin_unlock_irq(sch
->lock
);
1995 ret
= ccw_set_cmf(cdev
, 1);
2000 if (cdev
->drv
&& cdev
->drv
->thaw
)
2001 ret
= cdev
->drv
->thaw(cdev
);
2006 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
2008 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2011 if (cio_is_console(sch
->schid
))
2014 * While we were sleeping, devices may have gone or become
2015 * available again. Kick re-detection.
2017 spin_lock_irq(sch
->lock
);
2018 cdev
->private->flags
.resuming
= 1;
2019 ret
= ccw_device_recognition(cdev
);
2020 spin_unlock_irq(sch
->lock
);
2022 CIO_MSG_EVENT(0, "Couldn't start recognition for device "
2023 "%s (ret=%d)\n", dev_name(&cdev
->dev
), ret
);
2024 spin_lock_irq(sch
->lock
);
2025 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
2026 spin_unlock_irq(sch
->lock
);
2027 /* notify driver after the resume cb */
2030 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
2031 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
2034 cdev
->private->flags
.resuming
= 0;
2037 static int resume_handle_boxed(struct ccw_device
*cdev
)
2039 cdev
->private->state
= DEV_STATE_BOXED
;
2040 if (ccw_device_notify(cdev
, CIO_BOXED
))
2042 ccw_device_schedule_sch_unregister(cdev
);
2046 static int resume_handle_disc(struct ccw_device
*cdev
)
2048 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
2049 if (ccw_device_notify(cdev
, CIO_GONE
))
2051 ccw_device_schedule_sch_unregister(cdev
);
2055 static int ccw_device_pm_restore(struct device
*dev
)
2057 struct ccw_device
*cdev
= to_ccwdev(dev
);
2058 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2059 int ret
= 0, cm_enabled
;
2061 __ccw_device_pm_restore(cdev
);
2062 spin_lock_irq(sch
->lock
);
2063 if (cio_is_console(sch
->schid
)) {
2064 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
2065 spin_unlock_irq(sch
->lock
);
2068 cdev
->private->flags
.donotify
= 0;
2069 /* check recognition results */
2070 switch (cdev
->private->state
) {
2071 case DEV_STATE_OFFLINE
:
2073 case DEV_STATE_BOXED
:
2074 ret
= resume_handle_boxed(cdev
);
2075 spin_unlock_irq(sch
->lock
);
2079 case DEV_STATE_DISCONNECTED
:
2080 goto out_disc_unlock
;
2082 goto out_unreg_unlock
;
2084 /* check if the device id has changed */
2085 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
2086 CIO_MSG_EVENT(0, "resume: sch %s: failed (devno changed from "
2087 "%04x to %04x)\n", dev_name(&sch
->dev
),
2088 cdev
->private->dev_id
.devno
,
2089 sch
->schib
.pmcw
.dev
);
2090 goto out_unreg_unlock
;
2092 /* check if the device type has changed */
2093 if (!ccw_device_test_sense_data(cdev
)) {
2094 ccw_device_update_sense_data(cdev
);
2095 PREPARE_WORK(&cdev
->private->kick_work
,
2096 ccw_device_do_unbind_bind
);
2097 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
2101 if (!cdev
->online
) {
2105 ret
= ccw_device_online(cdev
);
2107 goto out_disc_unlock
;
2109 cm_enabled
= cdev
->private->cmb
!= NULL
;
2110 spin_unlock_irq(sch
->lock
);
2112 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
2113 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
2114 spin_lock_irq(sch
->lock
);
2115 goto out_disc_unlock
;
2118 ret
= ccw_set_cmf(cdev
, 1);
2120 CIO_MSG_EVENT(2, "resume: cdev %s: cmf failed "
2121 "(rc=%d)\n", dev_name(&cdev
->dev
), ret
);
2127 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
2128 ret
= cdev
->drv
->restore(cdev
);
2133 ret
= resume_handle_disc(cdev
);
2134 spin_unlock_irq(sch
->lock
);
2140 ccw_device_schedule_sch_unregister(cdev
);
2143 spin_unlock_irq(sch
->lock
);
2147 static struct dev_pm_ops ccw_pm_ops
= {
2148 .prepare
= ccw_device_pm_prepare
,
2149 .complete
= ccw_device_pm_complete
,
2150 .freeze
= ccw_device_pm_freeze
,
2151 .thaw
= ccw_device_pm_thaw
,
2152 .restore
= ccw_device_pm_restore
,
2155 struct bus_type ccw_bus_type
= {
2157 .match
= ccw_bus_match
,
2158 .uevent
= ccw_uevent
,
2159 .probe
= ccw_device_probe
,
2160 .remove
= ccw_device_remove
,
2161 .shutdown
= ccw_device_shutdown
,
2166 * ccw_driver_register() - register a ccw driver
2167 * @cdriver: driver to be registered
2169 * This function is mainly a wrapper around driver_register().
2171 * %0 on success and a negative error value on failure.
2173 int ccw_driver_register(struct ccw_driver
*cdriver
)
2175 struct device_driver
*drv
= &cdriver
->driver
;
2177 drv
->bus
= &ccw_bus_type
;
2178 drv
->name
= cdriver
->name
;
2179 drv
->owner
= cdriver
->owner
;
2181 return driver_register(drv
);
2185 * ccw_driver_unregister() - deregister a ccw driver
2186 * @cdriver: driver to be deregistered
2188 * This function is mainly a wrapper around driver_unregister().
2190 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
2192 driver_unregister(&cdriver
->driver
);
2195 /* Helper func for qdio. */
2196 struct subchannel_id
2197 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
2199 struct subchannel
*sch
;
2201 sch
= to_subchannel(cdev
->dev
.parent
);
2205 MODULE_LICENSE("GPL");
2206 EXPORT_SYMBOL(ccw_device_set_online
);
2207 EXPORT_SYMBOL(ccw_device_set_offline
);
2208 EXPORT_SYMBOL(ccw_driver_register
);
2209 EXPORT_SYMBOL(ccw_driver_unregister
);
2210 EXPORT_SYMBOL(get_ccwdev_by_busid
);
2211 EXPORT_SYMBOL(ccw_bus_type
);
2212 EXPORT_SYMBOL(ccw_device_work
);
2213 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);