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)
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/spinlock.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include <linux/list.h>
21 #include <linux/device.h>
22 #include <linux/workqueue.h>
23 #include <linux/timer.h>
25 #include <asm/ccwdev.h>
27 #include <asm/param.h> /* HZ */
33 #include "cio_debug.h"
38 #include "blacklist.h"
40 static struct timer_list recovery_timer
;
41 static DEFINE_SPINLOCK(recovery_lock
);
42 static int recovery_phase
;
43 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
45 /******************* bus type handling ***********************/
47 /* The Linux driver model distinguishes between a bus type and
48 * the bus itself. Of course we only have one channel
49 * subsystem driver and one channel system per machine, but
50 * we still use the abstraction. T.R. says it's a good idea. */
52 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
54 struct ccw_device
*cdev
= to_ccwdev(dev
);
55 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
56 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
61 found
= ccw_device_id_match(ids
, &cdev
->id
);
65 cdev
->id
.driver_info
= found
->driver_info
;
70 /* Store modalias string delimited by prefix/suffix string into buffer with
71 * specified size. Return length of resulting string (excluding trailing '\0')
72 * even if string doesn't fit buffer (snprintf semantics). */
73 static int snprint_alias(char *buf
, size_t size
,
74 struct ccw_device_id
*id
, const char *suffix
)
78 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
84 if (id
->dev_type
!= 0)
85 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
86 id
->dev_model
, suffix
);
88 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
93 /* Set up environment variables for ccw device uevent. Return 0 on success,
94 * non-zero otherwise. */
95 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
97 struct ccw_device
*cdev
= to_ccwdev(dev
);
98 struct ccw_device_id
*id
= &(cdev
->id
);
100 char modalias_buf
[30];
103 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
108 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
112 /* The next two can be zero, that's ok for us */
114 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
119 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
124 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
125 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
129 struct bus_type ccw_bus_type
;
131 static void io_subchannel_irq(struct subchannel
*);
132 static int io_subchannel_probe(struct subchannel
*);
133 static int io_subchannel_remove(struct subchannel
*);
134 static void io_subchannel_shutdown(struct subchannel
*);
135 static int io_subchannel_sch_event(struct subchannel
*, int);
136 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
138 static void recovery_func(unsigned long data
);
139 wait_queue_head_t ccw_device_init_wq
;
140 atomic_t ccw_device_init_count
;
142 static struct css_device_id io_subchannel_ids
[] = {
143 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
144 { /* end of list */ },
146 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
148 static int io_subchannel_prepare(struct subchannel
*sch
)
150 struct ccw_device
*cdev
;
152 * Don't allow suspend while a ccw device registration
153 * is still outstanding.
155 cdev
= sch_get_cdev(sch
);
156 if (cdev
&& !device_is_registered(&cdev
->dev
))
161 static int io_subchannel_settle(void)
165 ret
= wait_event_interruptible(ccw_device_init_wq
,
166 atomic_read(&ccw_device_init_count
) == 0);
169 flush_workqueue(cio_work_q
);
173 static struct css_driver io_subchannel_driver
= {
174 .owner
= THIS_MODULE
,
175 .subchannel_type
= io_subchannel_ids
,
176 .name
= "io_subchannel",
177 .irq
= io_subchannel_irq
,
178 .sch_event
= io_subchannel_sch_event
,
179 .chp_event
= io_subchannel_chp_event
,
180 .probe
= io_subchannel_probe
,
181 .remove
= io_subchannel_remove
,
182 .shutdown
= io_subchannel_shutdown
,
183 .prepare
= io_subchannel_prepare
,
184 .settle
= io_subchannel_settle
,
187 int __init
io_subchannel_init(void)
191 init_waitqueue_head(&ccw_device_init_wq
);
192 atomic_set(&ccw_device_init_count
, 0);
193 setup_timer(&recovery_timer
, recovery_func
, 0);
195 ret
= bus_register(&ccw_bus_type
);
198 ret
= css_driver_register(&io_subchannel_driver
);
200 bus_unregister(&ccw_bus_type
);
206 /************************ device handling **************************/
209 * A ccw_device has some interfaces in sysfs in addition to the
211 * The following entries are designed to export the information which
212 * resided in 2.4 in /proc/subchannels. Subchannel and device number
213 * are obvious, so they don't have an entry :)
214 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
217 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
219 struct subchannel
*sch
= to_subchannel(dev
);
220 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
225 for (chp
= 0; chp
< 8; chp
++) {
227 if (ssd
->path_mask
& mask
)
228 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
230 ret
+= sprintf(buf
+ ret
, "00 ");
232 ret
+= sprintf (buf
+ret
, "\n");
233 return min((ssize_t
)PAGE_SIZE
, ret
);
237 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
239 struct subchannel
*sch
= to_subchannel(dev
);
240 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
242 return sprintf (buf
, "%02x %02x %02x\n",
243 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
247 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
249 struct ccw_device
*cdev
= to_ccwdev(dev
);
250 struct ccw_device_id
*id
= &(cdev
->id
);
252 if (id
->dev_type
!= 0)
253 return sprintf(buf
, "%04x/%02x\n",
254 id
->dev_type
, id
->dev_model
);
256 return sprintf(buf
, "n/a\n");
260 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
262 struct ccw_device
*cdev
= to_ccwdev(dev
);
263 struct ccw_device_id
*id
= &(cdev
->id
);
265 return sprintf(buf
, "%04x/%02x\n",
266 id
->cu_type
, id
->cu_model
);
270 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
272 struct ccw_device
*cdev
= to_ccwdev(dev
);
273 struct ccw_device_id
*id
= &(cdev
->id
);
276 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
278 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
282 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
284 struct ccw_device
*cdev
= to_ccwdev(dev
);
286 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
289 int ccw_device_is_orphan(struct ccw_device
*cdev
)
291 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
294 static void ccw_device_unregister(struct ccw_device
*cdev
)
296 if (device_is_registered(&cdev
->dev
)) {
297 /* Undo device_add(). */
298 device_del(&cdev
->dev
);
300 if (cdev
->private->flags
.initialized
) {
301 cdev
->private->flags
.initialized
= 0;
302 /* Release reference from device_initialize(). */
303 put_device(&cdev
->dev
);
307 static void io_subchannel_quiesce(struct subchannel
*);
310 * ccw_device_set_offline() - disable a ccw device for I/O
311 * @cdev: target ccw device
313 * This function calls the driver's set_offline() function for @cdev, if
314 * given, and then disables @cdev.
316 * %0 on success and a negative error value on failure.
318 * enabled, ccw device lock not held
320 int ccw_device_set_offline(struct ccw_device
*cdev
)
322 struct subchannel
*sch
;
327 if (!cdev
->online
|| !cdev
->drv
)
330 if (cdev
->drv
->set_offline
) {
331 ret
= cdev
->drv
->set_offline(cdev
);
336 spin_lock_irq(cdev
->ccwlock
);
337 sch
= to_subchannel(cdev
->dev
.parent
);
338 /* Wait until a final state or DISCONNECTED is reached */
339 while (!dev_fsm_final_state(cdev
) &&
340 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
341 spin_unlock_irq(cdev
->ccwlock
);
342 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
343 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
344 spin_lock_irq(cdev
->ccwlock
);
347 ret
= ccw_device_offline(cdev
);
350 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
351 "0.%x.%04x\n", ret
, cdev
->private->dev_id
.ssid
,
352 cdev
->private->dev_id
.devno
);
355 state
= cdev
->private->state
;
356 spin_unlock_irq(cdev
->ccwlock
);
357 io_subchannel_quiesce(sch
);
358 spin_lock_irq(cdev
->ccwlock
);
359 cdev
->private->state
= state
;
360 } while (ret
== -EBUSY
);
361 spin_unlock_irq(cdev
->ccwlock
);
362 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
363 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
364 /* Inform the user if set offline failed. */
365 if (cdev
->private->state
== DEV_STATE_BOXED
) {
366 pr_warning("%s: The device entered boxed state while "
367 "being set offline\n", dev_name(&cdev
->dev
));
368 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
369 pr_warning("%s: The device stopped operating while "
370 "being set offline\n", dev_name(&cdev
->dev
));
372 /* Give up reference from ccw_device_set_online(). */
373 put_device(&cdev
->dev
);
377 cdev
->private->state
= DEV_STATE_OFFLINE
;
378 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
379 spin_unlock_irq(cdev
->ccwlock
);
380 /* Give up reference from ccw_device_set_online(). */
381 put_device(&cdev
->dev
);
386 * ccw_device_set_online() - enable a ccw device for I/O
387 * @cdev: target ccw device
389 * This function first enables @cdev and then calls the driver's set_online()
390 * function for @cdev, if given. If set_online() returns an error, @cdev is
393 * %0 on success and a negative error value on failure.
395 * enabled, ccw device lock not held
397 int ccw_device_set_online(struct ccw_device
*cdev
)
404 if (cdev
->online
|| !cdev
->drv
)
406 /* Hold on to an extra reference while device is online. */
407 if (!get_device(&cdev
->dev
))
410 spin_lock_irq(cdev
->ccwlock
);
411 ret
= ccw_device_online(cdev
);
412 spin_unlock_irq(cdev
->ccwlock
);
414 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
416 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
417 "device 0.%x.%04x\n",
418 ret
, cdev
->private->dev_id
.ssid
,
419 cdev
->private->dev_id
.devno
);
420 /* Give up online reference since onlining failed. */
421 put_device(&cdev
->dev
);
424 spin_lock_irq(cdev
->ccwlock
);
425 /* Check if online processing was successful */
426 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
427 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
428 spin_unlock_irq(cdev
->ccwlock
);
429 /* Inform the user that set online failed. */
430 if (cdev
->private->state
== DEV_STATE_BOXED
) {
431 pr_warning("%s: Setting the device online failed "
432 "because it is boxed\n",
433 dev_name(&cdev
->dev
));
434 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
435 pr_warning("%s: Setting the device online failed "
436 "because it is not operational\n",
437 dev_name(&cdev
->dev
));
439 /* Give up online reference since onlining failed. */
440 put_device(&cdev
->dev
);
443 spin_unlock_irq(cdev
->ccwlock
);
444 if (cdev
->drv
->set_online
)
445 ret
= cdev
->drv
->set_online(cdev
);
452 spin_lock_irq(cdev
->ccwlock
);
453 /* Wait until a final state or DISCONNECTED is reached */
454 while (!dev_fsm_final_state(cdev
) &&
455 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
456 spin_unlock_irq(cdev
->ccwlock
);
457 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
458 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
459 spin_lock_irq(cdev
->ccwlock
);
461 ret2
= ccw_device_offline(cdev
);
464 spin_unlock_irq(cdev
->ccwlock
);
465 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
466 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
467 /* Give up online reference since onlining failed. */
468 put_device(&cdev
->dev
);
472 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
473 "device 0.%x.%04x\n",
474 ret2
, cdev
->private->dev_id
.ssid
,
475 cdev
->private->dev_id
.devno
);
476 cdev
->private->state
= DEV_STATE_OFFLINE
;
477 spin_unlock_irq(cdev
->ccwlock
);
478 /* Give up online reference since onlining failed. */
479 put_device(&cdev
->dev
);
483 static int online_store_handle_offline(struct ccw_device
*cdev
)
485 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
) {
486 spin_lock_irq(cdev
->ccwlock
);
487 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
488 spin_unlock_irq(cdev
->ccwlock
);
489 } else if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->set_offline
)
490 return ccw_device_set_offline(cdev
);
494 static int online_store_recog_and_online(struct ccw_device
*cdev
)
496 /* Do device recognition, if needed. */
497 if (cdev
->private->state
== DEV_STATE_BOXED
) {
498 spin_lock_irq(cdev
->ccwlock
);
499 ccw_device_recognition(cdev
);
500 spin_unlock_irq(cdev
->ccwlock
);
501 wait_event(cdev
->private->wait_q
,
502 cdev
->private->flags
.recog_done
);
503 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
504 /* recognition failed */
507 if (cdev
->drv
&& cdev
->drv
->set_online
)
508 ccw_device_set_online(cdev
);
512 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
516 ret
= online_store_recog_and_online(cdev
);
519 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
520 ret
= ccw_device_stlck(cdev
);
523 if (cdev
->id
.cu_type
== 0)
524 cdev
->private->state
= DEV_STATE_NOT_OPER
;
525 ret
= online_store_recog_and_online(cdev
);
532 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
533 const char *buf
, size_t count
)
535 struct ccw_device
*cdev
= to_ccwdev(dev
);
539 if (!dev_fsm_final_state(cdev
) &&
540 cdev
->private->state
!= DEV_STATE_DISCONNECTED
)
542 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
545 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
546 atomic_set(&cdev
->private->onoff
, 0);
549 if (!strncmp(buf
, "force\n", count
)) {
555 ret
= strict_strtoul(buf
, 16, &i
);
561 ret
= online_store_handle_offline(cdev
);
564 ret
= online_store_handle_online(cdev
, force
);
571 module_put(cdev
->drv
->owner
);
572 atomic_set(&cdev
->private->onoff
, 0);
573 return (ret
< 0) ? ret
: count
;
577 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
579 struct ccw_device
*cdev
= to_ccwdev(dev
);
580 struct subchannel
*sch
;
582 if (ccw_device_is_orphan(cdev
))
583 return sprintf(buf
, "no device\n");
584 switch (cdev
->private->state
) {
585 case DEV_STATE_BOXED
:
586 return sprintf(buf
, "boxed\n");
587 case DEV_STATE_DISCONNECTED
:
588 case DEV_STATE_DISCONNECTED_SENSE_ID
:
589 case DEV_STATE_NOT_OPER
:
590 sch
= to_subchannel(dev
->parent
);
592 return sprintf(buf
, "no path\n");
594 return sprintf(buf
, "no device\n");
596 /* All other states considered fine. */
597 return sprintf(buf
, "good\n");
601 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
602 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
603 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
604 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
605 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
606 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
607 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
609 static struct attribute
*io_subchannel_attrs
[] = {
610 &dev_attr_chpids
.attr
,
611 &dev_attr_pimpampom
.attr
,
615 static struct attribute_group io_subchannel_attr_group
= {
616 .attrs
= io_subchannel_attrs
,
619 static struct attribute
* ccwdev_attrs
[] = {
620 &dev_attr_devtype
.attr
,
621 &dev_attr_cutype
.attr
,
622 &dev_attr_modalias
.attr
,
623 &dev_attr_online
.attr
,
624 &dev_attr_cmb_enable
.attr
,
625 &dev_attr_availability
.attr
,
629 static struct attribute_group ccwdev_attr_group
= {
630 .attrs
= ccwdev_attrs
,
633 static const struct attribute_group
*ccwdev_attr_groups
[] = {
638 /* this is a simple abstraction for device_register that sets the
639 * correct bus type and adds the bus specific files */
640 static int ccw_device_register(struct ccw_device
*cdev
)
642 struct device
*dev
= &cdev
->dev
;
645 dev
->bus
= &ccw_bus_type
;
646 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
647 cdev
->private->dev_id
.devno
);
650 return device_add(dev
);
653 static int match_dev_id(struct device
*dev
, void *data
)
655 struct ccw_device
*cdev
= to_ccwdev(dev
);
656 struct ccw_dev_id
*dev_id
= data
;
658 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
661 static struct ccw_device
*get_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
)
665 dev
= bus_find_device(&ccw_bus_type
, NULL
, dev_id
, match_dev_id
);
667 return dev
? to_ccwdev(dev
) : NULL
;
670 static void ccw_device_do_unbind_bind(struct ccw_device
*cdev
)
674 if (device_is_registered(&cdev
->dev
)) {
675 device_release_driver(&cdev
->dev
);
676 ret
= device_attach(&cdev
->dev
);
677 WARN_ON(ret
== -ENODEV
);
682 ccw_device_release(struct device
*dev
)
684 struct ccw_device
*cdev
;
686 cdev
= to_ccwdev(dev
);
687 /* Release reference of parent subchannel. */
688 put_device(cdev
->dev
.parent
);
689 kfree(cdev
->private);
693 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
695 struct ccw_device
*cdev
;
697 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
699 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
700 GFP_KERNEL
| GFP_DMA
);
705 return ERR_PTR(-ENOMEM
);
708 static void ccw_device_todo(struct work_struct
*work
);
710 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
711 struct ccw_device
*cdev
)
713 cdev
->private->cdev
= cdev
;
714 atomic_set(&cdev
->private->onoff
, 0);
715 cdev
->dev
.parent
= &sch
->dev
;
716 cdev
->dev
.release
= ccw_device_release
;
717 INIT_WORK(&cdev
->private->todo_work
, ccw_device_todo
);
718 cdev
->dev
.groups
= ccwdev_attr_groups
;
719 /* Do first half of device_register. */
720 device_initialize(&cdev
->dev
);
721 if (!get_device(&sch
->dev
)) {
722 /* Release reference from device_initialize(). */
723 put_device(&cdev
->dev
);
726 cdev
->private->flags
.initialized
= 1;
730 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
732 struct ccw_device
*cdev
;
735 cdev
= io_subchannel_allocate_dev(sch
);
737 ret
= io_subchannel_initialize_dev(sch
, cdev
);
744 static void io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
746 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
748 struct ccw_device
*cdev
;
750 /* Need to allocate a new ccw device. */
751 cdev
= io_subchannel_create_ccwdev(sch
);
753 /* OK, we did everything we could... */
754 css_sch_device_unregister(sch
);
757 /* Start recognition for the new ccw device. */
758 io_subchannel_recog(cdev
, sch
);
762 * Register recognized device.
764 static void io_subchannel_register(struct ccw_device
*cdev
)
766 struct subchannel
*sch
;
770 sch
= to_subchannel(cdev
->dev
.parent
);
772 * Check if subchannel is still registered. It may have become
773 * unregistered if a machine check hit us after finishing
774 * device recognition but before the register work could be
777 if (!device_is_registered(&sch
->dev
))
779 css_update_ssd_info(sch
);
781 * io_subchannel_register() will also be called after device
782 * recognition has been done for a boxed device (which will already
783 * be registered). We need to reprobe since we may now have sense id
786 if (device_is_registered(&cdev
->dev
)) {
788 ret
= device_reprobe(&cdev
->dev
);
790 /* We can't do much here. */
791 CIO_MSG_EVENT(0, "device_reprobe() returned"
792 " %d for 0.%x.%04x\n", ret
,
793 cdev
->private->dev_id
.ssid
,
794 cdev
->private->dev_id
.devno
);
799 * Now we know this subchannel will stay, we can throw
800 * our delayed uevent.
802 dev_set_uevent_suppress(&sch
->dev
, 0);
803 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
804 /* make it known to the system */
805 ret
= ccw_device_register(cdev
);
807 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
808 cdev
->private->dev_id
.ssid
,
809 cdev
->private->dev_id
.devno
, ret
);
810 spin_lock_irqsave(sch
->lock
, flags
);
811 sch_set_cdev(sch
, NULL
);
812 spin_unlock_irqrestore(sch
->lock
, flags
);
813 /* Release initial device reference. */
814 put_device(&cdev
->dev
);
818 cdev
->private->flags
.recog_done
= 1;
819 wake_up(&cdev
->private->wait_q
);
821 if (atomic_dec_and_test(&ccw_device_init_count
))
822 wake_up(&ccw_device_init_wq
);
825 static void ccw_device_call_sch_unregister(struct ccw_device
*cdev
)
827 struct subchannel
*sch
;
829 /* Get subchannel reference for local processing. */
830 if (!get_device(cdev
->dev
.parent
))
832 sch
= to_subchannel(cdev
->dev
.parent
);
833 css_sch_device_unregister(sch
);
834 /* Release subchannel reference for local processing. */
835 put_device(&sch
->dev
);
839 * subchannel recognition done. Called from the state machine.
842 io_subchannel_recog_done(struct ccw_device
*cdev
)
844 if (css_init_done
== 0) {
845 cdev
->private->flags
.recog_done
= 1;
848 switch (cdev
->private->state
) {
849 case DEV_STATE_BOXED
:
850 /* Device did not respond in time. */
851 case DEV_STATE_NOT_OPER
:
852 cdev
->private->flags
.recog_done
= 1;
853 /* Remove device found not operational. */
854 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
855 if (atomic_dec_and_test(&ccw_device_init_count
))
856 wake_up(&ccw_device_init_wq
);
858 case DEV_STATE_OFFLINE
:
860 * We can't register the device in interrupt context so
861 * we schedule a work item.
863 ccw_device_sched_todo(cdev
, CDEV_TODO_REGISTER
);
868 static void io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
870 struct ccw_device_private
*priv
;
872 cdev
->ccwlock
= sch
->lock
;
874 /* Init private data. */
875 priv
= cdev
->private;
876 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
877 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
878 priv
->schid
= sch
->schid
;
879 priv
->state
= DEV_STATE_NOT_OPER
;
880 INIT_LIST_HEAD(&priv
->cmb_list
);
881 init_waitqueue_head(&priv
->wait_q
);
882 init_timer(&priv
->timer
);
884 /* Increase counter of devices currently in recognition. */
885 atomic_inc(&ccw_device_init_count
);
887 /* Start async. device sensing. */
888 spin_lock_irq(sch
->lock
);
889 sch_set_cdev(sch
, cdev
);
890 ccw_device_recognition(cdev
);
891 spin_unlock_irq(sch
->lock
);
894 static int ccw_device_move_to_sch(struct ccw_device
*cdev
,
895 struct subchannel
*sch
)
897 struct subchannel
*old_sch
;
898 int rc
, old_enabled
= 0;
900 old_sch
= to_subchannel(cdev
->dev
.parent
);
901 /* Obtain child reference for new parent. */
902 if (!get_device(&sch
->dev
))
905 if (!sch_is_pseudo_sch(old_sch
)) {
906 spin_lock_irq(old_sch
->lock
);
907 old_enabled
= old_sch
->schib
.pmcw
.ena
;
910 rc
= cio_disable_subchannel(old_sch
);
911 spin_unlock_irq(old_sch
->lock
);
913 /* Release child reference for new parent. */
914 put_device(&sch
->dev
);
919 mutex_lock(&sch
->reg_mutex
);
920 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
921 mutex_unlock(&sch
->reg_mutex
);
923 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
924 cdev
->private->dev_id
.ssid
,
925 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
926 sch
->schib
.pmcw
.dev
, rc
);
928 /* Try to reenable the old subchannel. */
929 spin_lock_irq(old_sch
->lock
);
930 cio_enable_subchannel(old_sch
, (u32
)(addr_t
)old_sch
);
931 spin_unlock_irq(old_sch
->lock
);
933 /* Release child reference for new parent. */
934 put_device(&sch
->dev
);
937 /* Clean up old subchannel. */
938 if (!sch_is_pseudo_sch(old_sch
)) {
939 spin_lock_irq(old_sch
->lock
);
940 sch_set_cdev(old_sch
, NULL
);
941 spin_unlock_irq(old_sch
->lock
);
942 css_schedule_eval(old_sch
->schid
);
944 /* Release child reference for old parent. */
945 put_device(&old_sch
->dev
);
946 /* Initialize new subchannel. */
947 spin_lock_irq(sch
->lock
);
948 cdev
->private->schid
= sch
->schid
;
949 cdev
->ccwlock
= sch
->lock
;
950 if (!sch_is_pseudo_sch(sch
))
951 sch_set_cdev(sch
, cdev
);
952 spin_unlock_irq(sch
->lock
);
953 if (!sch_is_pseudo_sch(sch
))
954 css_update_ssd_info(sch
);
958 static int ccw_device_move_to_orph(struct ccw_device
*cdev
)
960 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
961 struct channel_subsystem
*css
= to_css(sch
->dev
.parent
);
963 return ccw_device_move_to_sch(cdev
, css
->pseudo_subchannel
);
966 static void io_subchannel_irq(struct subchannel
*sch
)
968 struct ccw_device
*cdev
;
970 cdev
= sch_get_cdev(sch
);
972 CIO_TRACE_EVENT(6, "IRQ");
973 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
975 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
978 void io_subchannel_init_config(struct subchannel
*sch
)
980 memset(&sch
->config
, 0, sizeof(sch
->config
));
981 sch
->config
.csense
= 1;
984 static void io_subchannel_init_fields(struct subchannel
*sch
)
986 if (cio_is_console(sch
->schid
))
989 sch
->opm
= chp_get_sch_opm(sch
);
990 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
991 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
993 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
994 " - PIM = %02X, PAM = %02X, POM = %02X\n",
995 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
996 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
997 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
999 io_subchannel_init_config(sch
);
1003 * Note: We always return 0 so that we bind to the device even on error.
1004 * This is needed so that our remove function is called on unregister.
1006 static int io_subchannel_probe(struct subchannel
*sch
)
1008 struct ccw_device
*cdev
;
1011 if (cio_is_console(sch
->schid
)) {
1012 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1013 &io_subchannel_attr_group
);
1015 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1016 "attributes for subchannel "
1017 "0.%x.%04x (rc=%d)\n",
1018 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1020 * The console subchannel already has an associated ccw_device.
1021 * Throw the delayed uevent for the subchannel, register
1022 * the ccw_device and exit.
1024 dev_set_uevent_suppress(&sch
->dev
, 0);
1025 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1026 cdev
= sch_get_cdev(sch
);
1027 cdev
->dev
.groups
= ccwdev_attr_groups
;
1028 device_initialize(&cdev
->dev
);
1029 cdev
->private->flags
.initialized
= 1;
1030 ccw_device_register(cdev
);
1032 * Check if the device is already online. If it is
1033 * the reference count needs to be corrected since we
1034 * didn't obtain a reference in ccw_device_set_online.
1036 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1037 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1038 cdev
->private->state
!= DEV_STATE_BOXED
)
1039 get_device(&cdev
->dev
);
1042 io_subchannel_init_fields(sch
);
1043 rc
= cio_commit_config(sch
);
1046 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1047 &io_subchannel_attr_group
);
1050 /* Allocate I/O subchannel private data. */
1051 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1052 GFP_KERNEL
| GFP_DMA
);
1055 css_schedule_eval(sch
->schid
);
1059 spin_lock_irq(sch
->lock
);
1060 css_sched_sch_todo(sch
, SCH_TODO_UNREG
);
1061 spin_unlock_irq(sch
->lock
);
1066 io_subchannel_remove (struct subchannel
*sch
)
1068 struct ccw_device
*cdev
;
1070 cdev
= sch_get_cdev(sch
);
1073 io_subchannel_quiesce(sch
);
1074 /* Set ccw device to not operational and drop reference. */
1075 spin_lock_irq(cdev
->ccwlock
);
1076 sch_set_cdev(sch
, NULL
);
1077 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1078 spin_unlock_irq(cdev
->ccwlock
);
1079 ccw_device_unregister(cdev
);
1081 kfree(sch
->private);
1082 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1086 static void io_subchannel_verify(struct subchannel
*sch
)
1088 struct ccw_device
*cdev
;
1090 cdev
= sch_get_cdev(sch
);
1092 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1095 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1097 struct ccw_device
*cdev
;
1099 cdev
= sch_get_cdev(sch
);
1102 if (cio_update_schib(sch
))
1104 /* Check for I/O on path. */
1105 if (scsw_actl(&sch
->schib
.scsw
) == 0 || sch
->schib
.pmcw
.lpum
!= mask
)
1107 if (cdev
->private->state
== DEV_STATE_ONLINE
) {
1108 ccw_device_kill_io(cdev
);
1114 /* Trigger path verification. */
1115 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1119 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1122 static int io_subchannel_chp_event(struct subchannel
*sch
,
1123 struct chp_link
*link
, int event
)
1127 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1134 io_subchannel_terminate_path(sch
, mask
);
1139 io_subchannel_verify(sch
);
1142 if (cio_update_schib(sch
))
1144 io_subchannel_terminate_path(sch
, mask
);
1147 if (cio_update_schib(sch
))
1149 sch
->lpm
|= mask
& sch
->opm
;
1150 io_subchannel_verify(sch
);
1156 static void io_subchannel_quiesce(struct subchannel
*sch
)
1158 struct ccw_device
*cdev
;
1161 spin_lock_irq(sch
->lock
);
1162 cdev
= sch_get_cdev(sch
);
1163 if (cio_is_console(sch
->schid
))
1165 if (!sch
->schib
.pmcw
.ena
)
1167 ret
= cio_disable_subchannel(sch
);
1171 cdev
->handler(cdev
, cdev
->private->intparm
, ERR_PTR(-EIO
));
1172 while (ret
== -EBUSY
) {
1173 cdev
->private->state
= DEV_STATE_QUIESCE
;
1174 ret
= ccw_device_cancel_halt_clear(cdev
);
1175 if (ret
== -EBUSY
) {
1176 ccw_device_set_timeout(cdev
, HZ
/10);
1177 spin_unlock_irq(sch
->lock
);
1178 wait_event(cdev
->private->wait_q
,
1179 cdev
->private->state
!= DEV_STATE_QUIESCE
);
1180 spin_lock_irq(sch
->lock
);
1182 ret
= cio_disable_subchannel(sch
);
1185 spin_unlock_irq(sch
->lock
);
1188 static void io_subchannel_shutdown(struct subchannel
*sch
)
1190 io_subchannel_quiesce(sch
);
1193 static int device_is_disconnected(struct ccw_device
*cdev
)
1197 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1198 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1201 static int recovery_check(struct device
*dev
, void *data
)
1203 struct ccw_device
*cdev
= to_ccwdev(dev
);
1206 spin_lock_irq(cdev
->ccwlock
);
1207 switch (cdev
->private->state
) {
1208 case DEV_STATE_DISCONNECTED
:
1209 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1210 cdev
->private->dev_id
.ssid
,
1211 cdev
->private->dev_id
.devno
);
1212 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1215 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1219 spin_unlock_irq(cdev
->ccwlock
);
1224 static void recovery_work_func(struct work_struct
*unused
)
1228 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1230 spin_lock_irq(&recovery_lock
);
1231 if (!timer_pending(&recovery_timer
)) {
1232 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1234 mod_timer(&recovery_timer
, jiffies
+
1235 recovery_delay
[recovery_phase
] * HZ
);
1237 spin_unlock_irq(&recovery_lock
);
1239 CIO_MSG_EVENT(4, "recovery: end\n");
1242 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1244 static void recovery_func(unsigned long data
)
1247 * We can't do our recovery in softirq context and it's not
1248 * performance critical, so we schedule it.
1250 schedule_work(&recovery_work
);
1253 static void ccw_device_schedule_recovery(void)
1255 unsigned long flags
;
1257 CIO_MSG_EVENT(4, "recovery: schedule\n");
1258 spin_lock_irqsave(&recovery_lock
, flags
);
1259 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1261 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1263 spin_unlock_irqrestore(&recovery_lock
, flags
);
1266 static int purge_fn(struct device
*dev
, void *data
)
1268 struct ccw_device
*cdev
= to_ccwdev(dev
);
1269 struct ccw_dev_id
*id
= &cdev
->private->dev_id
;
1271 spin_lock_irq(cdev
->ccwlock
);
1272 if (is_blacklisted(id
->ssid
, id
->devno
) &&
1273 (cdev
->private->state
== DEV_STATE_OFFLINE
)) {
1274 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id
->ssid
,
1276 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1278 spin_unlock_irq(cdev
->ccwlock
);
1279 /* Abort loop in case of pending signal. */
1280 if (signal_pending(current
))
1287 * ccw_purge_blacklisted - purge unused, blacklisted devices
1289 * Unregister all ccw devices that are offline and on the blacklist.
1291 int ccw_purge_blacklisted(void)
1293 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1294 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1298 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1302 ccw_device_set_timeout(cdev
, 0);
1303 cdev
->private->flags
.fake_irb
= 0;
1304 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1306 ccw_device_schedule_recovery();
1309 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1311 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1313 CIO_TRACE_EVENT(2, "notoper");
1314 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1315 ccw_device_set_timeout(cdev
, 0);
1316 cio_disable_subchannel(sch
);
1317 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1320 enum io_sch_action
{
1324 IO_SCH_UNREG_ATTACH
,
1332 static enum io_sch_action
sch_get_action(struct subchannel
*sch
)
1334 struct ccw_device
*cdev
;
1336 cdev
= sch_get_cdev(sch
);
1337 if (cio_update_schib(sch
)) {
1338 /* Not operational. */
1340 return IO_SCH_UNREG
;
1341 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1342 return IO_SCH_UNREG
;
1343 return IO_SCH_ORPH_UNREG
;
1347 return IO_SCH_ATTACH
;
1348 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1349 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1350 return IO_SCH_UNREG_ATTACH
;
1351 return IO_SCH_ORPH_ATTACH
;
1353 if ((sch
->schib
.pmcw
.pam
& sch
->opm
) == 0) {
1354 if (ccw_device_notify(cdev
, CIO_NO_PATH
) != NOTIFY_OK
)
1355 return IO_SCH_UNREG
;
1358 if (device_is_disconnected(cdev
))
1359 return IO_SCH_REPROBE
;
1361 return IO_SCH_VERIFY
;
1366 * io_subchannel_sch_event - process subchannel event
1368 * @process: non-zero if function is called in process context
1370 * An unspecified event occurred for this subchannel. Adjust data according
1371 * to the current operational state of the subchannel and device. Return
1372 * zero when the event has been handled sufficiently or -EAGAIN when this
1373 * function should be called again in process context.
1375 static int io_subchannel_sch_event(struct subchannel
*sch
, int process
)
1377 unsigned long flags
;
1378 struct ccw_device
*cdev
;
1379 struct ccw_dev_id dev_id
;
1380 enum io_sch_action action
;
1383 spin_lock_irqsave(sch
->lock
, flags
);
1384 if (!device_is_registered(&sch
->dev
))
1386 if (work_pending(&sch
->todo_work
))
1388 cdev
= sch_get_cdev(sch
);
1389 if (cdev
&& work_pending(&cdev
->private->todo_work
))
1391 action
= sch_get_action(sch
);
1392 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1393 sch
->schid
.ssid
, sch
->schid
.sch_no
, process
,
1395 /* Perform immediate actions while holding the lock. */
1397 case IO_SCH_REPROBE
:
1398 /* Trigger device recognition. */
1399 ccw_device_trigger_reprobe(cdev
);
1403 if (cdev
->private->flags
.resuming
== 1) {
1404 if (cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
)) {
1405 ccw_device_set_notoper(cdev
);
1409 /* Trigger path verification. */
1410 io_subchannel_verify(sch
);
1414 ccw_device_set_disconnected(cdev
);
1417 case IO_SCH_ORPH_UNREG
:
1418 case IO_SCH_ORPH_ATTACH
:
1419 ccw_device_set_disconnected(cdev
);
1421 case IO_SCH_UNREG_ATTACH
:
1424 ccw_device_set_notoper(cdev
);
1432 spin_unlock_irqrestore(sch
->lock
, flags
);
1433 /* All other actions require process context. */
1436 /* Handle attached ccw device. */
1438 case IO_SCH_ORPH_UNREG
:
1439 case IO_SCH_ORPH_ATTACH
:
1440 /* Move ccw device to orphanage. */
1441 rc
= ccw_device_move_to_orph(cdev
);
1445 case IO_SCH_UNREG_ATTACH
:
1446 /* Unregister ccw device. */
1447 if (!cdev
->private->flags
.resuming
)
1448 ccw_device_unregister(cdev
);
1453 /* Handle subchannel. */
1455 case IO_SCH_ORPH_UNREG
:
1457 if (!cdev
|| !cdev
->private->flags
.resuming
)
1458 css_sch_device_unregister(sch
);
1460 case IO_SCH_ORPH_ATTACH
:
1461 case IO_SCH_UNREG_ATTACH
:
1463 dev_id
.ssid
= sch
->schid
.ssid
;
1464 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1465 cdev
= get_ccwdev_by_dev_id(&dev_id
);
1467 sch_create_and_recog_new_device(sch
);
1470 rc
= ccw_device_move_to_sch(cdev
, sch
);
1472 /* Release reference from get_ccwdev_by_dev_id() */
1473 put_device(&cdev
->dev
);
1476 spin_lock_irqsave(sch
->lock
, flags
);
1477 ccw_device_trigger_reprobe(cdev
);
1478 spin_unlock_irqrestore(sch
->lock
, flags
);
1479 /* Release reference from get_ccwdev_by_dev_id() */
1480 put_device(&cdev
->dev
);
1488 spin_unlock_irqrestore(sch
->lock
, flags
);
1493 #ifdef CONFIG_CCW_CONSOLE
1494 static struct ccw_device console_cdev
;
1495 static struct ccw_device_private console_private
;
1496 static int console_cdev_in_use
;
1498 static DEFINE_SPINLOCK(ccw_console_lock
);
1500 spinlock_t
* cio_get_console_lock(void)
1502 return &ccw_console_lock
;
1505 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1506 struct subchannel
*sch
)
1510 /* Attach subchannel private data. */
1511 sch
->private = cio_get_console_priv();
1512 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1513 io_subchannel_init_fields(sch
);
1514 rc
= cio_commit_config(sch
);
1517 sch
->driver
= &io_subchannel_driver
;
1518 /* Initialize the ccw_device structure. */
1519 cdev
->dev
.parent
= &sch
->dev
;
1520 sch_set_cdev(sch
, cdev
);
1521 io_subchannel_recog(cdev
, sch
);
1522 /* Now wait for the async. recognition to come to an end. */
1523 spin_lock_irq(cdev
->ccwlock
);
1524 while (!dev_fsm_final_state(cdev
))
1527 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1529 ccw_device_online(cdev
);
1530 while (!dev_fsm_final_state(cdev
))
1532 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1536 spin_unlock_irq(cdev
->ccwlock
);
1541 ccw_device_probe_console(void)
1543 struct subchannel
*sch
;
1546 if (xchg(&console_cdev_in_use
, 1) != 0)
1547 return ERR_PTR(-EBUSY
);
1548 sch
= cio_probe_console();
1550 console_cdev_in_use
= 0;
1551 return (void *) sch
;
1553 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1554 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1555 console_cdev
.private = &console_private
;
1556 console_private
.cdev
= &console_cdev
;
1557 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1559 cio_release_console();
1560 console_cdev_in_use
= 0;
1561 return ERR_PTR(ret
);
1563 console_cdev
.online
= 1;
1564 return &console_cdev
;
1567 static int ccw_device_pm_restore(struct device
*dev
);
1569 int ccw_device_force_console(void)
1571 if (!console_cdev_in_use
)
1573 return ccw_device_pm_restore(&console_cdev
.dev
);
1575 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1579 * get ccw_device matching the busid, but only if owned by cdrv
1582 __ccwdev_check_busid(struct device
*dev
, void *id
)
1588 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1593 * get_ccwdev_by_busid() - obtain device from a bus id
1594 * @cdrv: driver the device is owned by
1595 * @bus_id: bus id of the device to be searched
1597 * This function searches all devices owned by @cdrv for a device with a bus
1598 * id matching @bus_id.
1600 * If a match is found, its reference count of the found device is increased
1601 * and it is returned; else %NULL is returned.
1603 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1607 struct device_driver
*drv
;
1609 drv
= get_driver(&cdrv
->driver
);
1613 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1614 __ccwdev_check_busid
);
1617 return dev
? to_ccwdev(dev
) : NULL
;
1620 /************************** device driver handling ************************/
1622 /* This is the implementation of the ccw_driver class. The probe, remove
1623 * and release methods are initially very similar to the device_driver
1624 * implementations, with the difference that they have ccw_device
1627 * A ccw driver also contains the information that is needed for
1631 ccw_device_probe (struct device
*dev
)
1633 struct ccw_device
*cdev
= to_ccwdev(dev
);
1634 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1637 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1639 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1650 ccw_device_remove (struct device
*dev
)
1652 struct ccw_device
*cdev
= to_ccwdev(dev
);
1653 struct ccw_driver
*cdrv
= cdev
->drv
;
1660 spin_lock_irq(cdev
->ccwlock
);
1661 ret
= ccw_device_offline(cdev
);
1662 spin_unlock_irq(cdev
->ccwlock
);
1664 wait_event(cdev
->private->wait_q
,
1665 dev_fsm_final_state(cdev
));
1667 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1668 "device 0.%x.%04x\n",
1669 ret
, cdev
->private->dev_id
.ssid
,
1670 cdev
->private->dev_id
.devno
);
1671 /* Give up reference obtained in ccw_device_set_online(). */
1672 put_device(&cdev
->dev
);
1674 ccw_device_set_timeout(cdev
, 0);
1679 static void ccw_device_shutdown(struct device
*dev
)
1681 struct ccw_device
*cdev
;
1683 cdev
= to_ccwdev(dev
);
1684 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1685 cdev
->drv
->shutdown(cdev
);
1689 static int ccw_device_pm_prepare(struct device
*dev
)
1691 struct ccw_device
*cdev
= to_ccwdev(dev
);
1693 if (work_pending(&cdev
->private->todo_work
))
1695 /* Fail while device is being set online/offline. */
1696 if (atomic_read(&cdev
->private->onoff
))
1699 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1700 return cdev
->drv
->prepare(cdev
);
1705 static void ccw_device_pm_complete(struct device
*dev
)
1707 struct ccw_device
*cdev
= to_ccwdev(dev
);
1709 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1710 cdev
->drv
->complete(cdev
);
1713 static int ccw_device_pm_freeze(struct device
*dev
)
1715 struct ccw_device
*cdev
= to_ccwdev(dev
);
1716 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1717 int ret
, cm_enabled
;
1719 /* Fail suspend while device is in transistional state. */
1720 if (!dev_fsm_final_state(cdev
))
1724 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1725 ret
= cdev
->drv
->freeze(cdev
);
1730 spin_lock_irq(sch
->lock
);
1731 cm_enabled
= cdev
->private->cmb
!= NULL
;
1732 spin_unlock_irq(sch
->lock
);
1734 /* Don't have the css write on memory. */
1735 ret
= ccw_set_cmf(cdev
, 0);
1739 /* From here on, disallow device driver I/O. */
1740 spin_lock_irq(sch
->lock
);
1741 ret
= cio_disable_subchannel(sch
);
1742 spin_unlock_irq(sch
->lock
);
1747 static int ccw_device_pm_thaw(struct device
*dev
)
1749 struct ccw_device
*cdev
= to_ccwdev(dev
);
1750 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1751 int ret
, cm_enabled
;
1756 spin_lock_irq(sch
->lock
);
1757 /* Allow device driver I/O again. */
1758 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1759 cm_enabled
= cdev
->private->cmb
!= NULL
;
1760 spin_unlock_irq(sch
->lock
);
1765 ret
= ccw_set_cmf(cdev
, 1);
1770 if (cdev
->drv
&& cdev
->drv
->thaw
)
1771 ret
= cdev
->drv
->thaw(cdev
);
1776 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
1778 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1780 spin_lock_irq(sch
->lock
);
1781 if (cio_is_console(sch
->schid
)) {
1782 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1786 * While we were sleeping, devices may have gone or become
1787 * available again. Kick re-detection.
1789 cdev
->private->flags
.resuming
= 1;
1790 css_schedule_eval(sch
->schid
);
1791 spin_unlock_irq(sch
->lock
);
1792 css_complete_work();
1794 /* cdev may have been moved to a different subchannel. */
1795 sch
= to_subchannel(cdev
->dev
.parent
);
1796 spin_lock_irq(sch
->lock
);
1797 if (cdev
->private->state
!= DEV_STATE_ONLINE
&&
1798 cdev
->private->state
!= DEV_STATE_OFFLINE
)
1801 ccw_device_recognition(cdev
);
1802 spin_unlock_irq(sch
->lock
);
1803 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
1804 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
1805 spin_lock_irq(sch
->lock
);
1808 cdev
->private->flags
.resuming
= 0;
1809 spin_unlock_irq(sch
->lock
);
1812 static int resume_handle_boxed(struct ccw_device
*cdev
)
1814 cdev
->private->state
= DEV_STATE_BOXED
;
1815 if (ccw_device_notify(cdev
, CIO_BOXED
) == NOTIFY_OK
)
1817 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1821 static int resume_handle_disc(struct ccw_device
*cdev
)
1823 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1824 if (ccw_device_notify(cdev
, CIO_GONE
) == NOTIFY_OK
)
1826 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1830 static int ccw_device_pm_restore(struct device
*dev
)
1832 struct ccw_device
*cdev
= to_ccwdev(dev
);
1833 struct subchannel
*sch
;
1836 __ccw_device_pm_restore(cdev
);
1837 sch
= to_subchannel(cdev
->dev
.parent
);
1838 spin_lock_irq(sch
->lock
);
1839 if (cio_is_console(sch
->schid
))
1842 /* check recognition results */
1843 switch (cdev
->private->state
) {
1844 case DEV_STATE_OFFLINE
:
1845 case DEV_STATE_ONLINE
:
1846 cdev
->private->flags
.donotify
= 0;
1848 case DEV_STATE_BOXED
:
1849 ret
= resume_handle_boxed(cdev
);
1854 ret
= resume_handle_disc(cdev
);
1859 /* check if the device type has changed */
1860 if (!ccw_device_test_sense_data(cdev
)) {
1861 ccw_device_update_sense_data(cdev
);
1862 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
1869 if (ccw_device_online(cdev
)) {
1870 ret
= resume_handle_disc(cdev
);
1875 spin_unlock_irq(sch
->lock
);
1876 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1877 spin_lock_irq(sch
->lock
);
1879 if (ccw_device_notify(cdev
, CIO_OPER
) == NOTIFY_BAD
) {
1880 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1885 /* reenable cmf, if needed */
1886 if (cdev
->private->cmb
) {
1887 spin_unlock_irq(sch
->lock
);
1888 ret
= ccw_set_cmf(cdev
, 1);
1889 spin_lock_irq(sch
->lock
);
1891 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1892 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
1893 cdev
->private->dev_id
.devno
, ret
);
1899 spin_unlock_irq(sch
->lock
);
1900 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
1901 ret
= cdev
->drv
->restore(cdev
);
1905 spin_unlock_irq(sch
->lock
);
1909 static const struct dev_pm_ops ccw_pm_ops
= {
1910 .prepare
= ccw_device_pm_prepare
,
1911 .complete
= ccw_device_pm_complete
,
1912 .freeze
= ccw_device_pm_freeze
,
1913 .thaw
= ccw_device_pm_thaw
,
1914 .restore
= ccw_device_pm_restore
,
1917 struct bus_type ccw_bus_type
= {
1919 .match
= ccw_bus_match
,
1920 .uevent
= ccw_uevent
,
1921 .probe
= ccw_device_probe
,
1922 .remove
= ccw_device_remove
,
1923 .shutdown
= ccw_device_shutdown
,
1928 * ccw_driver_register() - register a ccw driver
1929 * @cdriver: driver to be registered
1931 * This function is mainly a wrapper around driver_register().
1933 * %0 on success and a negative error value on failure.
1935 int ccw_driver_register(struct ccw_driver
*cdriver
)
1937 struct device_driver
*drv
= &cdriver
->driver
;
1939 drv
->bus
= &ccw_bus_type
;
1940 drv
->name
= cdriver
->name
;
1941 drv
->owner
= cdriver
->owner
;
1943 return driver_register(drv
);
1947 * ccw_driver_unregister() - deregister a ccw driver
1948 * @cdriver: driver to be deregistered
1950 * This function is mainly a wrapper around driver_unregister().
1952 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
1954 driver_unregister(&cdriver
->driver
);
1957 /* Helper func for qdio. */
1958 struct subchannel_id
1959 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1961 struct subchannel
*sch
;
1963 sch
= to_subchannel(cdev
->dev
.parent
);
1967 static void ccw_device_todo(struct work_struct
*work
)
1969 struct ccw_device_private
*priv
;
1970 struct ccw_device
*cdev
;
1971 struct subchannel
*sch
;
1972 enum cdev_todo todo
;
1974 priv
= container_of(work
, struct ccw_device_private
, todo_work
);
1976 sch
= to_subchannel(cdev
->dev
.parent
);
1977 /* Find out todo. */
1978 spin_lock_irq(cdev
->ccwlock
);
1980 priv
->todo
= CDEV_TODO_NOTHING
;
1981 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1982 priv
->dev_id
.ssid
, priv
->dev_id
.devno
, todo
);
1983 spin_unlock_irq(cdev
->ccwlock
);
1986 case CDEV_TODO_ENABLE_CMF
:
1989 case CDEV_TODO_REBIND
:
1990 ccw_device_do_unbind_bind(cdev
);
1992 case CDEV_TODO_REGISTER
:
1993 io_subchannel_register(cdev
);
1995 case CDEV_TODO_UNREG_EVAL
:
1996 if (!sch_is_pseudo_sch(sch
))
1997 css_schedule_eval(sch
->schid
);
1999 case CDEV_TODO_UNREG
:
2000 if (sch_is_pseudo_sch(sch
))
2001 ccw_device_unregister(cdev
);
2003 ccw_device_call_sch_unregister(cdev
);
2008 /* Release workqueue ref. */
2009 put_device(&cdev
->dev
);
2013 * ccw_device_sched_todo - schedule ccw device operation
2017 * Schedule the operation identified by @todo to be performed on the slow path
2018 * workqueue. Do nothing if another operation with higher priority is already
2019 * scheduled. Needs to be called with ccwdev lock held.
2021 void ccw_device_sched_todo(struct ccw_device
*cdev
, enum cdev_todo todo
)
2023 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2024 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
2026 if (cdev
->private->todo
>= todo
)
2028 cdev
->private->todo
= todo
;
2029 /* Get workqueue ref. */
2030 if (!get_device(&cdev
->dev
))
2032 if (!queue_work(cio_work_q
, &cdev
->private->todo_work
)) {
2033 /* Already queued, release workqueue ref. */
2034 put_device(&cdev
->dev
);
2038 MODULE_LICENSE("GPL");
2039 EXPORT_SYMBOL(ccw_device_set_online
);
2040 EXPORT_SYMBOL(ccw_device_set_offline
);
2041 EXPORT_SYMBOL(ccw_driver_register
);
2042 EXPORT_SYMBOL(ccw_driver_unregister
);
2043 EXPORT_SYMBOL(get_ccwdev_by_busid
);
2044 EXPORT_SYMBOL(ccw_bus_type
);
2045 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);