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
*,
134 static void recovery_func(unsigned long data
);
135 struct workqueue_struct
*ccw_device_work
;
136 wait_queue_head_t ccw_device_init_wq
;
137 atomic_t ccw_device_init_count
;
139 static struct css_device_id io_subchannel_ids
[] = {
140 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
141 { /* end of list */ },
143 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
145 static int io_subchannel_prepare(struct subchannel
*sch
)
147 struct ccw_device
*cdev
;
149 * Don't allow suspend while a ccw device registration
150 * is still outstanding.
152 cdev
= sch_get_cdev(sch
);
153 if (cdev
&& !device_is_registered(&cdev
->dev
))
158 static void io_subchannel_settle(void)
160 wait_event(ccw_device_init_wq
,
161 atomic_read(&ccw_device_init_count
) == 0);
162 flush_workqueue(ccw_device_work
);
165 static struct css_driver io_subchannel_driver
= {
166 .owner
= THIS_MODULE
,
167 .subchannel_type
= io_subchannel_ids
,
168 .name
= "io_subchannel",
169 .irq
= io_subchannel_irq
,
170 .sch_event
= io_subchannel_sch_event
,
171 .chp_event
= io_subchannel_chp_event
,
172 .probe
= io_subchannel_probe
,
173 .remove
= io_subchannel_remove
,
174 .shutdown
= io_subchannel_shutdown
,
175 .prepare
= io_subchannel_prepare
,
176 .settle
= io_subchannel_settle
,
179 int __init
io_subchannel_init(void)
183 init_waitqueue_head(&ccw_device_init_wq
);
184 atomic_set(&ccw_device_init_count
, 0);
185 setup_timer(&recovery_timer
, recovery_func
, 0);
187 ccw_device_work
= create_singlethread_workqueue("cio");
188 if (!ccw_device_work
)
190 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
195 if ((ret
= bus_register (&ccw_bus_type
)))
198 ret
= css_driver_register(&io_subchannel_driver
);
205 destroy_workqueue(ccw_device_work
);
207 destroy_workqueue(slow_path_wq
);
212 /************************ device handling **************************/
215 * A ccw_device has some interfaces in sysfs in addition to the
217 * The following entries are designed to export the information which
218 * resided in 2.4 in /proc/subchannels. Subchannel and device number
219 * are obvious, so they don't have an entry :)
220 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
223 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
225 struct subchannel
*sch
= to_subchannel(dev
);
226 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
231 for (chp
= 0; chp
< 8; chp
++) {
233 if (ssd
->path_mask
& mask
)
234 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
236 ret
+= sprintf(buf
+ ret
, "00 ");
238 ret
+= sprintf (buf
+ret
, "\n");
239 return min((ssize_t
)PAGE_SIZE
, ret
);
243 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
245 struct subchannel
*sch
= to_subchannel(dev
);
246 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
248 return sprintf (buf
, "%02x %02x %02x\n",
249 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
253 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
255 struct ccw_device
*cdev
= to_ccwdev(dev
);
256 struct ccw_device_id
*id
= &(cdev
->id
);
258 if (id
->dev_type
!= 0)
259 return sprintf(buf
, "%04x/%02x\n",
260 id
->dev_type
, id
->dev_model
);
262 return sprintf(buf
, "n/a\n");
266 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
268 struct ccw_device
*cdev
= to_ccwdev(dev
);
269 struct ccw_device_id
*id
= &(cdev
->id
);
271 return sprintf(buf
, "%04x/%02x\n",
272 id
->cu_type
, id
->cu_model
);
276 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
278 struct ccw_device
*cdev
= to_ccwdev(dev
);
279 struct ccw_device_id
*id
= &(cdev
->id
);
282 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
284 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
288 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
290 struct ccw_device
*cdev
= to_ccwdev(dev
);
292 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
295 int ccw_device_is_orphan(struct ccw_device
*cdev
)
297 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
300 static void ccw_device_unregister(struct ccw_device
*cdev
)
302 if (test_and_clear_bit(1, &cdev
->private->registered
)) {
303 device_del(&cdev
->dev
);
304 /* Release reference from device_initialize(). */
305 put_device(&cdev
->dev
);
309 static void ccw_device_remove_orphan_cb(struct work_struct
*work
)
311 struct ccw_device_private
*priv
;
312 struct ccw_device
*cdev
;
314 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
316 ccw_device_unregister(cdev
);
317 /* Release cdev reference for workqueue processing. */
318 put_device(&cdev
->dev
);
322 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
327 * Forced offline in disconnected state means
328 * 'throw away device'.
330 if (ccw_device_is_orphan(cdev
)) {
332 * Deregister ccw device.
333 * Unfortunately, we cannot do this directly from the
336 /* Get cdev reference for workqueue processing. */
337 if (!get_device(&cdev
->dev
))
339 spin_lock_irqsave(cdev
->ccwlock
, flags
);
340 cdev
->private->state
= DEV_STATE_NOT_OPER
;
341 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
342 PREPARE_WORK(&cdev
->private->kick_work
,
343 ccw_device_remove_orphan_cb
);
344 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
346 /* Deregister subchannel, which will kill the ccw device. */
347 ccw_device_schedule_sch_unregister(cdev
);
351 * ccw_device_set_offline() - disable a ccw device for I/O
352 * @cdev: target ccw device
354 * This function calls the driver's set_offline() function for @cdev, if
355 * given, and then disables @cdev.
357 * %0 on success and a negative error value on failure.
359 * enabled, ccw device lock not held
361 int ccw_device_set_offline(struct ccw_device
*cdev
)
367 if (!cdev
->online
|| !cdev
->drv
)
370 if (cdev
->drv
->set_offline
) {
371 ret
= cdev
->drv
->set_offline(cdev
);
376 spin_lock_irq(cdev
->ccwlock
);
377 /* Wait until a final state or DISCONNECTED is reached */
378 while (!dev_fsm_final_state(cdev
) &&
379 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
380 spin_unlock_irq(cdev
->ccwlock
);
381 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
382 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
383 spin_lock_irq(cdev
->ccwlock
);
385 ret
= ccw_device_offline(cdev
);
388 spin_unlock_irq(cdev
->ccwlock
);
389 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
390 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
391 /* Give up reference from ccw_device_set_online(). */
392 put_device(&cdev
->dev
);
396 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
397 ret
, cdev
->private->dev_id
.ssid
,
398 cdev
->private->dev_id
.devno
);
399 cdev
->private->state
= DEV_STATE_OFFLINE
;
400 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
401 spin_unlock_irq(cdev
->ccwlock
);
402 /* Give up reference from ccw_device_set_online(). */
403 put_device(&cdev
->dev
);
408 * ccw_device_set_online() - enable a ccw device for I/O
409 * @cdev: target ccw device
411 * This function first enables @cdev and then calls the driver's set_online()
412 * function for @cdev, if given. If set_online() returns an error, @cdev is
415 * %0 on success and a negative error value on failure.
417 * enabled, ccw device lock not held
419 int ccw_device_set_online(struct ccw_device
*cdev
)
426 if (cdev
->online
|| !cdev
->drv
)
428 /* Hold on to an extra reference while device is online. */
429 if (!get_device(&cdev
->dev
))
432 spin_lock_irq(cdev
->ccwlock
);
433 ret
= ccw_device_online(cdev
);
434 spin_unlock_irq(cdev
->ccwlock
);
436 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
438 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
439 "device 0.%x.%04x\n",
440 ret
, cdev
->private->dev_id
.ssid
,
441 cdev
->private->dev_id
.devno
);
442 /* Give up online reference since onlining failed. */
443 put_device(&cdev
->dev
);
446 spin_lock_irq(cdev
->ccwlock
);
447 /* Check if online processing was successful */
448 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
449 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
450 spin_unlock_irq(cdev
->ccwlock
);
451 /* Give up online reference since onlining failed. */
452 put_device(&cdev
->dev
);
455 spin_unlock_irq(cdev
->ccwlock
);
456 if (cdev
->drv
->set_online
)
457 ret
= cdev
->drv
->set_online(cdev
);
464 spin_lock_irq(cdev
->ccwlock
);
465 /* Wait until a final state or DISCONNECTED is reached */
466 while (!dev_fsm_final_state(cdev
) &&
467 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
468 spin_unlock_irq(cdev
->ccwlock
);
469 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
470 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
471 spin_lock_irq(cdev
->ccwlock
);
473 ret2
= ccw_device_offline(cdev
);
476 spin_unlock_irq(cdev
->ccwlock
);
477 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
478 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
479 /* Give up online reference since onlining failed. */
480 put_device(&cdev
->dev
);
484 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
485 "device 0.%x.%04x\n",
486 ret2
, cdev
->private->dev_id
.ssid
,
487 cdev
->private->dev_id
.devno
);
488 cdev
->private->state
= DEV_STATE_OFFLINE
;
489 spin_unlock_irq(cdev
->ccwlock
);
490 /* Give up online reference since onlining failed. */
491 put_device(&cdev
->dev
);
495 static int online_store_handle_offline(struct ccw_device
*cdev
)
497 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
498 ccw_device_remove_disconnected(cdev
);
499 else if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->set_offline
)
500 return ccw_device_set_offline(cdev
);
504 static int online_store_recog_and_online(struct ccw_device
*cdev
)
508 /* Do device recognition, if needed. */
509 if (cdev
->private->state
== DEV_STATE_BOXED
) {
510 ret
= ccw_device_recognition(cdev
);
512 CIO_MSG_EVENT(0, "Couldn't start recognition "
513 "for device 0.%x.%04x (ret=%d)\n",
514 cdev
->private->dev_id
.ssid
,
515 cdev
->private->dev_id
.devno
, ret
);
518 wait_event(cdev
->private->wait_q
,
519 cdev
->private->flags
.recog_done
);
520 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
521 /* recognition failed */
524 if (cdev
->drv
&& cdev
->drv
->set_online
)
525 ccw_device_set_online(cdev
);
529 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
533 ret
= online_store_recog_and_online(cdev
);
536 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
537 ret
= ccw_device_stlck(cdev
);
540 if (cdev
->id
.cu_type
== 0)
541 cdev
->private->state
= DEV_STATE_NOT_OPER
;
542 ret
= online_store_recog_and_online(cdev
);
549 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
550 const char *buf
, size_t count
)
552 struct ccw_device
*cdev
= to_ccwdev(dev
);
556 if ((cdev
->private->state
!= DEV_STATE_OFFLINE
&&
557 cdev
->private->state
!= DEV_STATE_ONLINE
&&
558 cdev
->private->state
!= DEV_STATE_BOXED
&&
559 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) ||
560 atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
563 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
564 atomic_set(&cdev
->private->onoff
, 0);
567 if (!strncmp(buf
, "force\n", count
)) {
573 ret
= strict_strtoul(buf
, 16, &i
);
579 ret
= online_store_handle_offline(cdev
);
582 ret
= online_store_handle_online(cdev
, force
);
589 module_put(cdev
->drv
->owner
);
590 atomic_set(&cdev
->private->onoff
, 0);
591 return (ret
< 0) ? ret
: count
;
595 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
597 struct ccw_device
*cdev
= to_ccwdev(dev
);
598 struct subchannel
*sch
;
600 if (ccw_device_is_orphan(cdev
))
601 return sprintf(buf
, "no device\n");
602 switch (cdev
->private->state
) {
603 case DEV_STATE_BOXED
:
604 return sprintf(buf
, "boxed\n");
605 case DEV_STATE_DISCONNECTED
:
606 case DEV_STATE_DISCONNECTED_SENSE_ID
:
607 case DEV_STATE_NOT_OPER
:
608 sch
= to_subchannel(dev
->parent
);
610 return sprintf(buf
, "no path\n");
612 return sprintf(buf
, "no device\n");
614 /* All other states considered fine. */
615 return sprintf(buf
, "good\n");
619 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
620 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
621 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
622 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
623 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
624 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
625 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
627 static struct attribute
*io_subchannel_attrs
[] = {
628 &dev_attr_chpids
.attr
,
629 &dev_attr_pimpampom
.attr
,
633 static struct attribute_group io_subchannel_attr_group
= {
634 .attrs
= io_subchannel_attrs
,
637 static struct attribute
* ccwdev_attrs
[] = {
638 &dev_attr_devtype
.attr
,
639 &dev_attr_cutype
.attr
,
640 &dev_attr_modalias
.attr
,
641 &dev_attr_online
.attr
,
642 &dev_attr_cmb_enable
.attr
,
643 &dev_attr_availability
.attr
,
647 static struct attribute_group ccwdev_attr_group
= {
648 .attrs
= ccwdev_attrs
,
651 static const struct attribute_group
*ccwdev_attr_groups
[] = {
656 /* this is a simple abstraction for device_register that sets the
657 * correct bus type and adds the bus specific files */
658 static int ccw_device_register(struct ccw_device
*cdev
)
660 struct device
*dev
= &cdev
->dev
;
663 dev
->bus
= &ccw_bus_type
;
664 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
665 cdev
->private->dev_id
.devno
);
668 ret
= device_add(dev
);
672 set_bit(1, &cdev
->private->registered
);
677 struct ccw_dev_id dev_id
;
678 struct ccw_device
* sibling
;
682 match_devno(struct device
* dev
, void * data
)
684 struct match_data
* d
= data
;
685 struct ccw_device
* cdev
;
687 cdev
= to_ccwdev(dev
);
688 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
689 !ccw_device_is_orphan(cdev
) &&
690 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
691 (cdev
!= d
->sibling
))
696 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
697 struct ccw_device
*sibling
)
700 struct match_data data
;
702 data
.dev_id
= *dev_id
;
703 data
.sibling
= sibling
;
704 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
706 return dev
? to_ccwdev(dev
) : NULL
;
709 static int match_orphan(struct device
*dev
, void *data
)
711 struct ccw_dev_id
*dev_id
;
712 struct ccw_device
*cdev
;
715 cdev
= to_ccwdev(dev
);
716 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
719 static struct ccw_device
*
720 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
721 struct ccw_dev_id
*dev_id
)
725 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
728 return dev
? to_ccwdev(dev
) : NULL
;
731 void ccw_device_do_unbind_bind(struct work_struct
*work
)
733 struct ccw_device_private
*priv
;
734 struct ccw_device
*cdev
;
735 struct subchannel
*sch
;
738 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
740 sch
= to_subchannel(cdev
->dev
.parent
);
742 if (test_bit(1, &cdev
->private->registered
)) {
743 device_release_driver(&cdev
->dev
);
744 ret
= device_attach(&cdev
->dev
);
745 WARN_ON(ret
== -ENODEV
);
750 ccw_device_release(struct device
*dev
)
752 struct ccw_device
*cdev
;
754 cdev
= to_ccwdev(dev
);
755 /* Release reference of parent subchannel. */
756 put_device(cdev
->dev
.parent
);
757 kfree(cdev
->private);
761 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
763 struct ccw_device
*cdev
;
765 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
767 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
768 GFP_KERNEL
| GFP_DMA
);
773 return ERR_PTR(-ENOMEM
);
776 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
777 struct ccw_device
*cdev
)
779 cdev
->private->cdev
= cdev
;
780 atomic_set(&cdev
->private->onoff
, 0);
781 cdev
->dev
.parent
= &sch
->dev
;
782 cdev
->dev
.release
= ccw_device_release
;
783 INIT_WORK(&cdev
->private->kick_work
, NULL
);
784 cdev
->dev
.groups
= ccwdev_attr_groups
;
785 /* Do first half of device_register. */
786 device_initialize(&cdev
->dev
);
787 if (!get_device(&sch
->dev
)) {
788 /* Release reference from device_initialize(). */
789 put_device(&cdev
->dev
);
795 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
797 struct ccw_device
*cdev
;
800 cdev
= io_subchannel_allocate_dev(sch
);
802 ret
= io_subchannel_initialize_dev(sch
, cdev
);
809 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
811 static void sch_attach_device(struct subchannel
*sch
,
812 struct ccw_device
*cdev
)
814 css_update_ssd_info(sch
);
815 spin_lock_irq(sch
->lock
);
816 sch_set_cdev(sch
, cdev
);
817 cdev
->private->schid
= sch
->schid
;
818 cdev
->ccwlock
= sch
->lock
;
819 ccw_device_trigger_reprobe(cdev
);
820 spin_unlock_irq(sch
->lock
);
823 static void sch_attach_disconnected_device(struct subchannel
*sch
,
824 struct ccw_device
*cdev
)
826 struct subchannel
*other_sch
;
829 /* Get reference for new parent. */
830 if (!get_device(&sch
->dev
))
832 other_sch
= to_subchannel(cdev
->dev
.parent
);
833 /* Note: device_move() changes cdev->dev.parent */
834 ret
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
836 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
837 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
838 cdev
->private->dev_id
.devno
, ret
);
839 /* Put reference for new parent. */
840 put_device(&sch
->dev
);
843 sch_set_cdev(other_sch
, NULL
);
844 /* No need to keep a subchannel without ccw device around. */
845 css_sch_device_unregister(other_sch
);
846 sch_attach_device(sch
, cdev
);
847 /* Put reference for old parent. */
848 put_device(&other_sch
->dev
);
851 static void sch_attach_orphaned_device(struct subchannel
*sch
,
852 struct ccw_device
*cdev
)
855 struct subchannel
*pseudo_sch
;
857 /* Get reference for new parent. */
858 if (!get_device(&sch
->dev
))
860 pseudo_sch
= to_subchannel(cdev
->dev
.parent
);
862 * Try to move the ccw device to its new subchannel.
863 * Note: device_move() changes cdev->dev.parent
865 ret
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
867 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
868 "failed (ret=%d)!\n",
869 cdev
->private->dev_id
.ssid
,
870 cdev
->private->dev_id
.devno
, ret
);
871 /* Put reference for new parent. */
872 put_device(&sch
->dev
);
875 sch_attach_device(sch
, cdev
);
876 /* Put reference on pseudo subchannel. */
877 put_device(&pseudo_sch
->dev
);
880 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
882 struct ccw_device
*cdev
;
884 /* Need to allocate a new ccw device. */
885 cdev
= io_subchannel_create_ccwdev(sch
);
887 /* OK, we did everything we could... */
888 css_sch_device_unregister(sch
);
891 /* Start recognition for the new ccw device. */
892 if (io_subchannel_recog(cdev
, sch
)) {
893 spin_lock_irq(sch
->lock
);
894 sch_set_cdev(sch
, NULL
);
895 spin_unlock_irq(sch
->lock
);
896 css_sch_device_unregister(sch
);
897 /* Put reference from io_subchannel_create_ccwdev(). */
898 put_device(&sch
->dev
);
899 /* Give up initial reference. */
900 put_device(&cdev
->dev
);
905 void ccw_device_move_to_orphanage(struct work_struct
*work
)
907 struct ccw_device_private
*priv
;
908 struct ccw_device
*cdev
;
909 struct ccw_device
*replacing_cdev
;
910 struct subchannel
*sch
;
912 struct channel_subsystem
*css
;
913 struct ccw_dev_id dev_id
;
915 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
917 sch
= to_subchannel(cdev
->dev
.parent
);
918 css
= to_css(sch
->dev
.parent
);
919 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
920 dev_id
.ssid
= sch
->schid
.ssid
;
922 /* Increase refcount for pseudo subchannel. */
923 get_device(&css
->pseudo_subchannel
->dev
);
925 * Move the orphaned ccw device to the orphanage so the replacing
926 * ccw device can take its place on the subchannel.
927 * Note: device_move() changes cdev->dev.parent
929 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
,
932 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
933 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
934 cdev
->private->dev_id
.devno
, ret
);
935 /* Decrease refcount for pseudo subchannel again. */
936 put_device(&css
->pseudo_subchannel
->dev
);
939 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
941 * Search for the replacing ccw device
942 * - among the disconnected devices
945 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
946 if (replacing_cdev
) {
947 sch_attach_disconnected_device(sch
, replacing_cdev
);
948 /* Release reference from get_disc_ccwdev_by_dev_id() */
949 put_device(&replacing_cdev
->dev
);
950 /* Release reference of subchannel from old cdev. */
951 put_device(&sch
->dev
);
954 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
955 if (replacing_cdev
) {
956 sch_attach_orphaned_device(sch
, replacing_cdev
);
957 /* Release reference from get_orphaned_ccwdev_by_dev_id() */
958 put_device(&replacing_cdev
->dev
);
959 /* Release reference of subchannel from old cdev. */
960 put_device(&sch
->dev
);
963 sch_create_and_recog_new_device(sch
);
964 /* Release reference of subchannel from old cdev. */
965 put_device(&sch
->dev
);
969 * Register recognized device.
972 io_subchannel_register(struct work_struct
*work
)
974 struct ccw_device_private
*priv
;
975 struct ccw_device
*cdev
;
976 struct subchannel
*sch
;
980 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
982 sch
= to_subchannel(cdev
->dev
.parent
);
984 * Check if subchannel is still registered. It may have become
985 * unregistered if a machine check hit us after finishing
986 * device recognition but before the register work could be
989 if (!device_is_registered(&sch
->dev
))
991 css_update_ssd_info(sch
);
993 * io_subchannel_register() will also be called after device
994 * recognition has been done for a boxed device (which will already
995 * be registered). We need to reprobe since we may now have sense id
998 if (device_is_registered(&cdev
->dev
)) {
1000 ret
= device_reprobe(&cdev
->dev
);
1002 /* We can't do much here. */
1003 CIO_MSG_EVENT(0, "device_reprobe() returned"
1004 " %d for 0.%x.%04x\n", ret
,
1005 cdev
->private->dev_id
.ssid
,
1006 cdev
->private->dev_id
.devno
);
1011 * Now we know this subchannel will stay, we can throw
1012 * our delayed uevent.
1014 dev_set_uevent_suppress(&sch
->dev
, 0);
1015 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1016 /* make it known to the system */
1017 ret
= ccw_device_register(cdev
);
1019 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
1020 cdev
->private->dev_id
.ssid
,
1021 cdev
->private->dev_id
.devno
, ret
);
1022 spin_lock_irqsave(sch
->lock
, flags
);
1023 sch_set_cdev(sch
, NULL
);
1024 spin_unlock_irqrestore(sch
->lock
, flags
);
1025 /* Release initial device reference. */
1026 put_device(&cdev
->dev
);
1030 cdev
->private->flags
.recog_done
= 1;
1031 wake_up(&cdev
->private->wait_q
);
1033 /* Release reference for workqueue processing. */
1034 put_device(&cdev
->dev
);
1035 if (atomic_dec_and_test(&ccw_device_init_count
))
1036 wake_up(&ccw_device_init_wq
);
1039 static void ccw_device_call_sch_unregister(struct work_struct
*work
)
1041 struct ccw_device_private
*priv
;
1042 struct ccw_device
*cdev
;
1043 struct subchannel
*sch
;
1045 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1047 /* Get subchannel reference for local processing. */
1048 if (!get_device(cdev
->dev
.parent
))
1050 sch
= to_subchannel(cdev
->dev
.parent
);
1051 css_sch_device_unregister(sch
);
1052 /* Release cdev reference for workqueue processing.*/
1053 put_device(&cdev
->dev
);
1054 /* Release subchannel reference for local processing. */
1055 put_device(&sch
->dev
);
1058 void ccw_device_schedule_sch_unregister(struct ccw_device
*cdev
)
1060 /* Get cdev reference for workqueue processing. */
1061 if (!get_device(&cdev
->dev
))
1063 PREPARE_WORK(&cdev
->private->kick_work
,
1064 ccw_device_call_sch_unregister
);
1065 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1069 * subchannel recognition done. Called from the state machine.
1072 io_subchannel_recog_done(struct ccw_device
*cdev
)
1074 if (css_init_done
== 0) {
1075 cdev
->private->flags
.recog_done
= 1;
1078 switch (cdev
->private->state
) {
1079 case DEV_STATE_BOXED
:
1080 /* Device did not respond in time. */
1081 case DEV_STATE_NOT_OPER
:
1082 cdev
->private->flags
.recog_done
= 1;
1083 ccw_device_schedule_sch_unregister(cdev
);
1084 if (atomic_dec_and_test(&ccw_device_init_count
))
1085 wake_up(&ccw_device_init_wq
);
1087 case DEV_STATE_OFFLINE
:
1089 * We can't register the device in interrupt context so
1090 * we schedule a work item.
1092 if (!get_device(&cdev
->dev
))
1094 PREPARE_WORK(&cdev
->private->kick_work
,
1095 io_subchannel_register
);
1096 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1102 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
1105 struct ccw_device_private
*priv
;
1107 cdev
->ccwlock
= sch
->lock
;
1109 /* Init private data. */
1110 priv
= cdev
->private;
1111 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1112 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
1113 priv
->schid
= sch
->schid
;
1114 priv
->state
= DEV_STATE_NOT_OPER
;
1115 INIT_LIST_HEAD(&priv
->cmb_list
);
1116 init_waitqueue_head(&priv
->wait_q
);
1117 init_timer(&priv
->timer
);
1119 /* Increase counter of devices currently in recognition. */
1120 atomic_inc(&ccw_device_init_count
);
1122 /* Start async. device sensing. */
1123 spin_lock_irq(sch
->lock
);
1124 sch_set_cdev(sch
, cdev
);
1125 rc
= ccw_device_recognition(cdev
);
1126 spin_unlock_irq(sch
->lock
);
1128 if (atomic_dec_and_test(&ccw_device_init_count
))
1129 wake_up(&ccw_device_init_wq
);
1134 static void ccw_device_move_to_sch(struct work_struct
*work
)
1136 struct ccw_device_private
*priv
;
1138 struct subchannel
*sch
;
1139 struct ccw_device
*cdev
;
1140 struct subchannel
*former_parent
;
1142 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1145 former_parent
= to_subchannel(cdev
->dev
.parent
);
1146 /* Get reference for new parent. */
1147 if (!get_device(&sch
->dev
))
1149 mutex_lock(&sch
->reg_mutex
);
1151 * Try to move the ccw device to its new subchannel.
1152 * Note: device_move() changes cdev->dev.parent
1154 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
1155 mutex_unlock(&sch
->reg_mutex
);
1157 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1158 "0.%x.%04x failed (ret=%d)!\n",
1159 cdev
->private->dev_id
.ssid
,
1160 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1161 sch
->schid
.sch_no
, rc
);
1162 css_sch_device_unregister(sch
);
1163 /* Put reference for new parent again. */
1164 put_device(&sch
->dev
);
1167 if (!sch_is_pseudo_sch(former_parent
)) {
1168 spin_lock_irq(former_parent
->lock
);
1169 sch_set_cdev(former_parent
, NULL
);
1170 spin_unlock_irq(former_parent
->lock
);
1171 css_sch_device_unregister(former_parent
);
1172 /* Reset intparm to zeroes. */
1173 former_parent
->config
.intparm
= 0;
1174 cio_commit_config(former_parent
);
1176 sch_attach_device(sch
, cdev
);
1178 /* Put reference for old parent. */
1179 put_device(&former_parent
->dev
);
1180 put_device(&cdev
->dev
);
1183 static void io_subchannel_irq(struct subchannel
*sch
)
1185 struct ccw_device
*cdev
;
1187 cdev
= sch_get_cdev(sch
);
1189 CIO_TRACE_EVENT(6, "IRQ");
1190 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
1192 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1195 void io_subchannel_init_config(struct subchannel
*sch
)
1197 memset(&sch
->config
, 0, sizeof(sch
->config
));
1198 sch
->config
.csense
= 1;
1199 /* Use subchannel mp mode when there is more than 1 installed CHPID. */
1200 if ((sch
->schib
.pmcw
.pim
& (sch
->schib
.pmcw
.pim
- 1)) != 0)
1204 static void io_subchannel_init_fields(struct subchannel
*sch
)
1206 if (cio_is_console(sch
->schid
))
1209 sch
->opm
= chp_get_sch_opm(sch
);
1210 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1211 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1213 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1214 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1215 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1216 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1217 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1219 io_subchannel_init_config(sch
);
1222 static void io_subchannel_do_unreg(struct work_struct
*work
)
1224 struct subchannel
*sch
;
1226 sch
= container_of(work
, struct subchannel
, work
);
1227 css_sch_device_unregister(sch
);
1228 put_device(&sch
->dev
);
1231 /* Schedule unregister if we have no cdev. */
1232 static void io_subchannel_schedule_removal(struct subchannel
*sch
)
1234 get_device(&sch
->dev
);
1235 INIT_WORK(&sch
->work
, io_subchannel_do_unreg
);
1236 queue_work(slow_path_wq
, &sch
->work
);
1240 * Note: We always return 0 so that we bind to the device even on error.
1241 * This is needed so that our remove function is called on unregister.
1243 static int io_subchannel_probe(struct subchannel
*sch
)
1245 struct ccw_device
*cdev
;
1247 unsigned long flags
;
1248 struct ccw_dev_id dev_id
;
1250 if (cio_is_console(sch
->schid
)) {
1251 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1252 &io_subchannel_attr_group
);
1254 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1255 "attributes for subchannel "
1256 "0.%x.%04x (rc=%d)\n",
1257 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1259 * The console subchannel already has an associated ccw_device.
1260 * Throw the delayed uevent for the subchannel, register
1261 * the ccw_device and exit.
1263 dev_set_uevent_suppress(&sch
->dev
, 0);
1264 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1265 cdev
= sch_get_cdev(sch
);
1266 cdev
->dev
.groups
= ccwdev_attr_groups
;
1267 device_initialize(&cdev
->dev
);
1268 ccw_device_register(cdev
);
1270 * Check if the device is already online. If it is
1271 * the reference count needs to be corrected since we
1272 * didn't obtain a reference in ccw_device_set_online.
1274 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1275 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1276 cdev
->private->state
!= DEV_STATE_BOXED
)
1277 get_device(&cdev
->dev
);
1280 io_subchannel_init_fields(sch
);
1281 rc
= cio_commit_config(sch
);
1284 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1285 &io_subchannel_attr_group
);
1288 /* Allocate I/O subchannel private data. */
1289 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1290 GFP_KERNEL
| GFP_DMA
);
1294 * First check if a fitting device may be found amongst the
1295 * disconnected devices or in the orphanage.
1297 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1298 dev_id
.ssid
= sch
->schid
.ssid
;
1299 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1301 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1305 * Schedule moving the device until when we have a registered
1306 * subchannel to move to and succeed the probe. We can
1307 * unregister later again, when the probe is through.
1309 cdev
->private->sch
= sch
;
1310 PREPARE_WORK(&cdev
->private->kick_work
,
1311 ccw_device_move_to_sch
);
1312 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1315 cdev
= io_subchannel_create_ccwdev(sch
);
1318 rc
= io_subchannel_recog(cdev
, sch
);
1320 spin_lock_irqsave(sch
->lock
, flags
);
1321 io_subchannel_recog_done(cdev
);
1322 spin_unlock_irqrestore(sch
->lock
, flags
);
1327 io_subchannel_schedule_removal(sch
);
1332 io_subchannel_remove (struct subchannel
*sch
)
1334 struct ccw_device
*cdev
;
1335 unsigned long flags
;
1337 cdev
= sch_get_cdev(sch
);
1340 /* Set ccw device to not operational and drop reference. */
1341 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1342 sch_set_cdev(sch
, NULL
);
1343 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1344 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1345 ccw_device_unregister(cdev
);
1347 kfree(sch
->private);
1348 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1352 static int io_subchannel_notify(struct subchannel
*sch
, int event
)
1354 struct ccw_device
*cdev
;
1356 cdev
= sch_get_cdev(sch
);
1359 return ccw_device_notify(cdev
, event
);
1362 static void io_subchannel_verify(struct subchannel
*sch
)
1364 struct ccw_device
*cdev
;
1366 cdev
= sch_get_cdev(sch
);
1368 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1371 static int check_for_io_on_path(struct subchannel
*sch
, int mask
)
1373 if (cio_update_schib(sch
))
1375 if (scsw_actl(&sch
->schib
.scsw
) && sch
->schib
.pmcw
.lpum
== mask
)
1380 static void terminate_internal_io(struct subchannel
*sch
,
1381 struct ccw_device
*cdev
)
1383 if (cio_clear(sch
)) {
1384 /* Recheck device in case clear failed. */
1387 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1389 css_schedule_eval(sch
->schid
);
1392 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1393 /* Request retry of internal operation. */
1394 cdev
->private->flags
.intretry
= 1;
1397 cdev
->handler(cdev
, cdev
->private->intparm
,
1401 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1403 struct ccw_device
*cdev
;
1405 cdev
= sch_get_cdev(sch
);
1408 if (check_for_io_on_path(sch
, mask
)) {
1409 if (cdev
->private->state
== DEV_STATE_ONLINE
)
1410 ccw_device_kill_io(cdev
);
1412 terminate_internal_io(sch
, cdev
);
1413 /* Re-start path verification. */
1414 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1417 /* trigger path verification. */
1418 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1422 static int io_subchannel_chp_event(struct subchannel
*sch
,
1423 struct chp_link
*link
, int event
)
1427 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1434 io_subchannel_terminate_path(sch
, mask
);
1439 io_subchannel_verify(sch
);
1442 if (cio_update_schib(sch
))
1444 io_subchannel_terminate_path(sch
, mask
);
1447 if (cio_update_schib(sch
))
1449 sch
->lpm
|= mask
& sch
->opm
;
1450 io_subchannel_verify(sch
);
1457 io_subchannel_shutdown(struct subchannel
*sch
)
1459 struct ccw_device
*cdev
;
1462 cdev
= sch_get_cdev(sch
);
1464 if (cio_is_console(sch
->schid
))
1466 if (!sch
->schib
.pmcw
.ena
)
1467 /* Nothing to do. */
1469 ret
= cio_disable_subchannel(sch
);
1471 /* Subchannel is disabled, we're done. */
1473 cdev
->private->state
= DEV_STATE_QUIESCE
;
1475 cdev
->handler(cdev
, cdev
->private->intparm
,
1477 ret
= ccw_device_cancel_halt_clear(cdev
);
1478 if (ret
== -EBUSY
) {
1479 ccw_device_set_timeout(cdev
, HZ
/10);
1480 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1482 cio_disable_subchannel(sch
);
1485 static int io_subchannel_get_status(struct subchannel
*sch
)
1489 if (stsch(sch
->schid
, &schib
) || !schib
.pmcw
.dnv
)
1491 if (sch
->schib
.pmcw
.dnv
&& (schib
.pmcw
.dev
!= sch
->schib
.pmcw
.dev
))
1492 return CIO_REVALIDATE
;
1498 static int device_is_disconnected(struct ccw_device
*cdev
)
1502 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1503 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1506 static int recovery_check(struct device
*dev
, void *data
)
1508 struct ccw_device
*cdev
= to_ccwdev(dev
);
1511 spin_lock_irq(cdev
->ccwlock
);
1512 switch (cdev
->private->state
) {
1513 case DEV_STATE_DISCONNECTED
:
1514 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1515 cdev
->private->dev_id
.ssid
,
1516 cdev
->private->dev_id
.devno
);
1517 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1520 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1524 spin_unlock_irq(cdev
->ccwlock
);
1529 static void recovery_work_func(struct work_struct
*unused
)
1533 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1535 spin_lock_irq(&recovery_lock
);
1536 if (!timer_pending(&recovery_timer
)) {
1537 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1539 mod_timer(&recovery_timer
, jiffies
+
1540 recovery_delay
[recovery_phase
] * HZ
);
1542 spin_unlock_irq(&recovery_lock
);
1544 CIO_MSG_EVENT(4, "recovery: end\n");
1547 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1549 static void recovery_func(unsigned long data
)
1552 * We can't do our recovery in softirq context and it's not
1553 * performance critical, so we schedule it.
1555 schedule_work(&recovery_work
);
1558 static void ccw_device_schedule_recovery(void)
1560 unsigned long flags
;
1562 CIO_MSG_EVENT(4, "recovery: schedule\n");
1563 spin_lock_irqsave(&recovery_lock
, flags
);
1564 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1566 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1568 spin_unlock_irqrestore(&recovery_lock
, flags
);
1571 static int purge_fn(struct device
*dev
, void *data
)
1573 struct ccw_device
*cdev
= to_ccwdev(dev
);
1574 struct ccw_device_private
*priv
= cdev
->private;
1577 spin_lock_irq(cdev
->ccwlock
);
1578 unreg
= is_blacklisted(priv
->dev_id
.ssid
, priv
->dev_id
.devno
) &&
1579 (priv
->state
== DEV_STATE_OFFLINE
);
1580 spin_unlock_irq(cdev
->ccwlock
);
1583 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv
->dev_id
.ssid
,
1584 priv
->dev_id
.devno
);
1585 ccw_device_schedule_sch_unregister(cdev
);
1588 /* Abort loop in case of pending signal. */
1589 if (signal_pending(current
))
1596 * ccw_purge_blacklisted - purge unused, blacklisted devices
1598 * Unregister all ccw devices that are offline and on the blacklist.
1600 int ccw_purge_blacklisted(void)
1602 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1603 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1607 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1611 ccw_device_set_timeout(cdev
, 0);
1612 cdev
->private->flags
.fake_irb
= 0;
1613 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1615 ccw_device_schedule_recovery();
1618 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1620 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1622 CIO_TRACE_EVENT(2, "notoper");
1623 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1624 ccw_device_set_timeout(cdev
, 0);
1625 cio_disable_subchannel(sch
);
1626 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1629 static int io_subchannel_sch_event(struct subchannel
*sch
, int slow
)
1631 int event
, ret
, disc
;
1632 unsigned long flags
;
1633 enum { NONE
, UNREGISTER
, UNREGISTER_PROBE
, REPROBE
, DISC
} action
;
1634 struct ccw_device
*cdev
;
1636 spin_lock_irqsave(sch
->lock
, flags
);
1637 cdev
= sch_get_cdev(sch
);
1638 disc
= device_is_disconnected(cdev
);
1640 /* Disconnected devices are evaluated directly only.*/
1641 spin_unlock_irqrestore(sch
->lock
, flags
);
1644 /* No interrupt after machine check - kill pending timers. */
1646 ccw_device_set_timeout(cdev
, 0);
1647 if (!disc
&& !slow
) {
1648 /* Non-disconnected devices are evaluated on the slow path. */
1649 spin_unlock_irqrestore(sch
->lock
, flags
);
1652 event
= io_subchannel_get_status(sch
);
1653 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1654 sch
->schid
.ssid
, sch
->schid
.sch_no
, event
,
1655 disc
? "disconnected" : "normal",
1656 slow
? "slow" : "fast");
1657 /* Analyze subchannel status. */
1662 /* Check if paths have become available. */
1668 /* Ask driver what to do with device. */
1669 if (io_subchannel_notify(sch
, event
))
1672 action
= UNREGISTER
;
1674 case CIO_REVALIDATE
:
1675 /* Device will be removed, so no notify necessary. */
1677 /* Reprobe because immediate unregister might block. */
1680 action
= UNREGISTER_PROBE
;
1684 /* Get device operational again. */
1688 /* Perform action. */
1692 case UNREGISTER_PROBE
:
1693 ccw_device_set_notoper(cdev
);
1694 /* Unregister device (will use subchannel lock). */
1695 spin_unlock_irqrestore(sch
->lock
, flags
);
1696 css_sch_device_unregister(sch
);
1697 spin_lock_irqsave(sch
->lock
, flags
);
1700 ccw_device_trigger_reprobe(cdev
);
1703 ccw_device_set_disconnected(cdev
);
1708 spin_unlock_irqrestore(sch
->lock
, flags
);
1709 /* Probe if necessary. */
1710 if (action
== UNREGISTER_PROBE
)
1711 ret
= css_probe_device(sch
->schid
);
1716 #ifdef CONFIG_CCW_CONSOLE
1717 static struct ccw_device console_cdev
;
1718 static struct ccw_device_private console_private
;
1719 static int console_cdev_in_use
;
1721 static DEFINE_SPINLOCK(ccw_console_lock
);
1723 spinlock_t
* cio_get_console_lock(void)
1725 return &ccw_console_lock
;
1728 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1729 struct subchannel
*sch
)
1733 /* Attach subchannel private data. */
1734 sch
->private = cio_get_console_priv();
1735 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1736 io_subchannel_init_fields(sch
);
1737 rc
= cio_commit_config(sch
);
1740 sch
->driver
= &io_subchannel_driver
;
1741 /* Initialize the ccw_device structure. */
1742 cdev
->dev
.parent
= &sch
->dev
;
1743 rc
= io_subchannel_recog(cdev
, sch
);
1747 /* Now wait for the async. recognition to come to an end. */
1748 spin_lock_irq(cdev
->ccwlock
);
1749 while (!dev_fsm_final_state(cdev
))
1752 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1754 ccw_device_online(cdev
);
1755 while (!dev_fsm_final_state(cdev
))
1757 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1761 spin_unlock_irq(cdev
->ccwlock
);
1766 ccw_device_probe_console(void)
1768 struct subchannel
*sch
;
1771 if (xchg(&console_cdev_in_use
, 1) != 0)
1772 return ERR_PTR(-EBUSY
);
1773 sch
= cio_probe_console();
1775 console_cdev_in_use
= 0;
1776 return (void *) sch
;
1778 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1779 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1780 console_cdev
.private = &console_private
;
1781 console_private
.cdev
= &console_cdev
;
1782 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1784 cio_release_console();
1785 console_cdev_in_use
= 0;
1786 return ERR_PTR(ret
);
1788 console_cdev
.online
= 1;
1789 return &console_cdev
;
1792 static int ccw_device_pm_restore(struct device
*dev
);
1794 int ccw_device_force_console(void)
1796 if (!console_cdev_in_use
)
1798 return ccw_device_pm_restore(&console_cdev
.dev
);
1800 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1804 * get ccw_device matching the busid, but only if owned by cdrv
1807 __ccwdev_check_busid(struct device
*dev
, void *id
)
1813 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1818 * get_ccwdev_by_busid() - obtain device from a bus id
1819 * @cdrv: driver the device is owned by
1820 * @bus_id: bus id of the device to be searched
1822 * This function searches all devices owned by @cdrv for a device with a bus
1823 * id matching @bus_id.
1825 * If a match is found, its reference count of the found device is increased
1826 * and it is returned; else %NULL is returned.
1828 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1832 struct device_driver
*drv
;
1834 drv
= get_driver(&cdrv
->driver
);
1838 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1839 __ccwdev_check_busid
);
1842 return dev
? to_ccwdev(dev
) : NULL
;
1845 /************************** device driver handling ************************/
1847 /* This is the implementation of the ccw_driver class. The probe, remove
1848 * and release methods are initially very similar to the device_driver
1849 * implementations, with the difference that they have ccw_device
1852 * A ccw driver also contains the information that is needed for
1856 ccw_device_probe (struct device
*dev
)
1858 struct ccw_device
*cdev
= to_ccwdev(dev
);
1859 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1862 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1864 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1875 ccw_device_remove (struct device
*dev
)
1877 struct ccw_device
*cdev
= to_ccwdev(dev
);
1878 struct ccw_driver
*cdrv
= cdev
->drv
;
1885 spin_lock_irq(cdev
->ccwlock
);
1886 ret
= ccw_device_offline(cdev
);
1887 spin_unlock_irq(cdev
->ccwlock
);
1889 wait_event(cdev
->private->wait_q
,
1890 dev_fsm_final_state(cdev
));
1892 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1893 "device 0.%x.%04x\n",
1894 ret
, cdev
->private->dev_id
.ssid
,
1895 cdev
->private->dev_id
.devno
);
1896 /* Give up reference obtained in ccw_device_set_online(). */
1897 put_device(&cdev
->dev
);
1899 ccw_device_set_timeout(cdev
, 0);
1904 static void ccw_device_shutdown(struct device
*dev
)
1906 struct ccw_device
*cdev
;
1908 cdev
= to_ccwdev(dev
);
1909 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1910 cdev
->drv
->shutdown(cdev
);
1914 static int ccw_device_pm_prepare(struct device
*dev
)
1916 struct ccw_device
*cdev
= to_ccwdev(dev
);
1918 if (work_pending(&cdev
->private->kick_work
))
1920 /* Fail while device is being set online/offline. */
1921 if (atomic_read(&cdev
->private->onoff
))
1924 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1925 return cdev
->drv
->prepare(cdev
);
1930 static void ccw_device_pm_complete(struct device
*dev
)
1932 struct ccw_device
*cdev
= to_ccwdev(dev
);
1934 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1935 cdev
->drv
->complete(cdev
);
1938 static int ccw_device_pm_freeze(struct device
*dev
)
1940 struct ccw_device
*cdev
= to_ccwdev(dev
);
1941 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1942 int ret
, cm_enabled
;
1944 /* Fail suspend while device is in transistional state. */
1945 if (!dev_fsm_final_state(cdev
))
1949 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1950 ret
= cdev
->drv
->freeze(cdev
);
1955 spin_lock_irq(sch
->lock
);
1956 cm_enabled
= cdev
->private->cmb
!= NULL
;
1957 spin_unlock_irq(sch
->lock
);
1959 /* Don't have the css write on memory. */
1960 ret
= ccw_set_cmf(cdev
, 0);
1964 /* From here on, disallow device driver I/O. */
1965 spin_lock_irq(sch
->lock
);
1966 ret
= cio_disable_subchannel(sch
);
1967 spin_unlock_irq(sch
->lock
);
1972 static int ccw_device_pm_thaw(struct device
*dev
)
1974 struct ccw_device
*cdev
= to_ccwdev(dev
);
1975 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1976 int ret
, cm_enabled
;
1981 spin_lock_irq(sch
->lock
);
1982 /* Allow device driver I/O again. */
1983 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1984 cm_enabled
= cdev
->private->cmb
!= NULL
;
1985 spin_unlock_irq(sch
->lock
);
1990 ret
= ccw_set_cmf(cdev
, 1);
1995 if (cdev
->drv
&& cdev
->drv
->thaw
)
1996 ret
= cdev
->drv
->thaw(cdev
);
2001 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
2003 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2006 if (cio_is_console(sch
->schid
))
2009 * While we were sleeping, devices may have gone or become
2010 * available again. Kick re-detection.
2012 spin_lock_irq(sch
->lock
);
2013 cdev
->private->flags
.resuming
= 1;
2014 ret
= ccw_device_recognition(cdev
);
2015 spin_unlock_irq(sch
->lock
);
2017 CIO_MSG_EVENT(0, "Couldn't start recognition for device "
2018 "0.%x.%04x (ret=%d)\n",
2019 cdev
->private->dev_id
.ssid
,
2020 cdev
->private->dev_id
.devno
, ret
);
2021 spin_lock_irq(sch
->lock
);
2022 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
2023 spin_unlock_irq(sch
->lock
);
2024 /* notify driver after the resume cb */
2027 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
2028 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
2031 cdev
->private->flags
.resuming
= 0;
2034 static int resume_handle_boxed(struct ccw_device
*cdev
)
2036 cdev
->private->state
= DEV_STATE_BOXED
;
2037 if (ccw_device_notify(cdev
, CIO_BOXED
))
2039 ccw_device_schedule_sch_unregister(cdev
);
2043 static int resume_handle_disc(struct ccw_device
*cdev
)
2045 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
2046 if (ccw_device_notify(cdev
, CIO_GONE
))
2048 ccw_device_schedule_sch_unregister(cdev
);
2052 static int ccw_device_pm_restore(struct device
*dev
)
2054 struct ccw_device
*cdev
= to_ccwdev(dev
);
2055 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2056 int ret
= 0, cm_enabled
;
2058 __ccw_device_pm_restore(cdev
);
2059 spin_lock_irq(sch
->lock
);
2060 if (cio_is_console(sch
->schid
)) {
2061 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
2062 spin_unlock_irq(sch
->lock
);
2065 cdev
->private->flags
.donotify
= 0;
2066 /* check recognition results */
2067 switch (cdev
->private->state
) {
2068 case DEV_STATE_OFFLINE
:
2070 case DEV_STATE_BOXED
:
2071 ret
= resume_handle_boxed(cdev
);
2072 spin_unlock_irq(sch
->lock
);
2076 case DEV_STATE_DISCONNECTED
:
2077 goto out_disc_unlock
;
2079 goto out_unreg_unlock
;
2081 /* check if the device id has changed */
2082 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
2083 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
2084 "changed from %04x to %04x)\n",
2085 sch
->schid
.ssid
, sch
->schid
.sch_no
,
2086 cdev
->private->dev_id
.devno
,
2087 sch
->schib
.pmcw
.dev
);
2088 goto out_unreg_unlock
;
2090 /* check if the device type has changed */
2091 if (!ccw_device_test_sense_data(cdev
)) {
2092 ccw_device_update_sense_data(cdev
);
2093 PREPARE_WORK(&cdev
->private->kick_work
,
2094 ccw_device_do_unbind_bind
);
2095 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
2099 if (!cdev
->online
) {
2103 ret
= ccw_device_online(cdev
);
2105 goto out_disc_unlock
;
2107 cm_enabled
= cdev
->private->cmb
!= NULL
;
2108 spin_unlock_irq(sch
->lock
);
2110 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
2111 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
2112 spin_lock_irq(sch
->lock
);
2113 goto out_disc_unlock
;
2116 ret
= ccw_set_cmf(cdev
, 1);
2118 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
2119 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
2120 cdev
->private->dev_id
.devno
, ret
);
2126 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
2127 ret
= cdev
->drv
->restore(cdev
);
2132 ret
= resume_handle_disc(cdev
);
2133 spin_unlock_irq(sch
->lock
);
2139 ccw_device_schedule_sch_unregister(cdev
);
2142 spin_unlock_irq(sch
->lock
);
2146 static struct dev_pm_ops ccw_pm_ops
= {
2147 .prepare
= ccw_device_pm_prepare
,
2148 .complete
= ccw_device_pm_complete
,
2149 .freeze
= ccw_device_pm_freeze
,
2150 .thaw
= ccw_device_pm_thaw
,
2151 .restore
= ccw_device_pm_restore
,
2154 struct bus_type ccw_bus_type
= {
2156 .match
= ccw_bus_match
,
2157 .uevent
= ccw_uevent
,
2158 .probe
= ccw_device_probe
,
2159 .remove
= ccw_device_remove
,
2160 .shutdown
= ccw_device_shutdown
,
2165 * ccw_driver_register() - register a ccw driver
2166 * @cdriver: driver to be registered
2168 * This function is mainly a wrapper around driver_register().
2170 * %0 on success and a negative error value on failure.
2172 int ccw_driver_register(struct ccw_driver
*cdriver
)
2174 struct device_driver
*drv
= &cdriver
->driver
;
2176 drv
->bus
= &ccw_bus_type
;
2177 drv
->name
= cdriver
->name
;
2178 drv
->owner
= cdriver
->owner
;
2180 return driver_register(drv
);
2184 * ccw_driver_unregister() - deregister a ccw driver
2185 * @cdriver: driver to be deregistered
2187 * This function is mainly a wrapper around driver_unregister().
2189 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
2191 driver_unregister(&cdriver
->driver
);
2194 /* Helper func for qdio. */
2195 struct subchannel_id
2196 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
2198 struct subchannel
*sch
;
2200 sch
= to_subchannel(cdev
->dev
.parent
);
2204 MODULE_LICENSE("GPL");
2205 EXPORT_SYMBOL(ccw_device_set_online
);
2206 EXPORT_SYMBOL(ccw_device_set_offline
);
2207 EXPORT_SYMBOL(ccw_driver_register
);
2208 EXPORT_SYMBOL(ccw_driver_unregister
);
2209 EXPORT_SYMBOL(get_ccwdev_by_busid
);
2210 EXPORT_SYMBOL(ccw_bus_type
);
2211 EXPORT_SYMBOL(ccw_device_work
);
2212 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);