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 struct workqueue_struct
*ccw_device_work
;
140 wait_queue_head_t ccw_device_init_wq
;
141 atomic_t ccw_device_init_count
;
143 static struct css_device_id io_subchannel_ids
[] = {
144 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
145 { /* end of list */ },
147 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
149 static int io_subchannel_prepare(struct subchannel
*sch
)
151 struct ccw_device
*cdev
;
153 * Don't allow suspend while a ccw device registration
154 * is still outstanding.
156 cdev
= sch_get_cdev(sch
);
157 if (cdev
&& !device_is_registered(&cdev
->dev
))
162 static void io_subchannel_settle(void)
164 wait_event(ccw_device_init_wq
,
165 atomic_read(&ccw_device_init_count
) == 0);
166 flush_workqueue(ccw_device_work
);
169 static struct css_driver io_subchannel_driver
= {
170 .owner
= THIS_MODULE
,
171 .subchannel_type
= io_subchannel_ids
,
172 .name
= "io_subchannel",
173 .irq
= io_subchannel_irq
,
174 .sch_event
= io_subchannel_sch_event
,
175 .chp_event
= io_subchannel_chp_event
,
176 .probe
= io_subchannel_probe
,
177 .remove
= io_subchannel_remove
,
178 .shutdown
= io_subchannel_shutdown
,
179 .prepare
= io_subchannel_prepare
,
180 .settle
= io_subchannel_settle
,
183 int __init
io_subchannel_init(void)
187 init_waitqueue_head(&ccw_device_init_wq
);
188 atomic_set(&ccw_device_init_count
, 0);
189 setup_timer(&recovery_timer
, recovery_func
, 0);
191 ccw_device_work
= create_singlethread_workqueue("cio");
192 if (!ccw_device_work
)
194 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
199 if ((ret
= bus_register (&ccw_bus_type
)))
202 ret
= css_driver_register(&io_subchannel_driver
);
209 destroy_workqueue(ccw_device_work
);
211 destroy_workqueue(slow_path_wq
);
216 /************************ device handling **************************/
219 * A ccw_device has some interfaces in sysfs in addition to the
221 * The following entries are designed to export the information which
222 * resided in 2.4 in /proc/subchannels. Subchannel and device number
223 * are obvious, so they don't have an entry :)
224 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
227 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
229 struct subchannel
*sch
= to_subchannel(dev
);
230 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
235 for (chp
= 0; chp
< 8; chp
++) {
237 if (ssd
->path_mask
& mask
)
238 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
240 ret
+= sprintf(buf
+ ret
, "00 ");
242 ret
+= sprintf (buf
+ret
, "\n");
243 return min((ssize_t
)PAGE_SIZE
, ret
);
247 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
249 struct subchannel
*sch
= to_subchannel(dev
);
250 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
252 return sprintf (buf
, "%02x %02x %02x\n",
253 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
257 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
259 struct ccw_device
*cdev
= to_ccwdev(dev
);
260 struct ccw_device_id
*id
= &(cdev
->id
);
262 if (id
->dev_type
!= 0)
263 return sprintf(buf
, "%04x/%02x\n",
264 id
->dev_type
, id
->dev_model
);
266 return sprintf(buf
, "n/a\n");
270 cutype_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
);
275 return sprintf(buf
, "%04x/%02x\n",
276 id
->cu_type
, id
->cu_model
);
280 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
282 struct ccw_device
*cdev
= to_ccwdev(dev
);
283 struct ccw_device_id
*id
= &(cdev
->id
);
286 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
288 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
292 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
294 struct ccw_device
*cdev
= to_ccwdev(dev
);
296 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
299 int ccw_device_is_orphan(struct ccw_device
*cdev
)
301 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
304 static void ccw_device_unregister(struct ccw_device
*cdev
)
306 if (device_is_registered(&cdev
->dev
)) {
307 /* Undo device_add(). */
308 device_del(&cdev
->dev
);
310 if (cdev
->private->flags
.initialized
) {
311 cdev
->private->flags
.initialized
= 0;
312 /* Release reference from device_initialize(). */
313 put_device(&cdev
->dev
);
317 static void io_subchannel_quiesce(struct subchannel
*);
320 * ccw_device_set_offline() - disable a ccw device for I/O
321 * @cdev: target ccw device
323 * This function calls the driver's set_offline() function for @cdev, if
324 * given, and then disables @cdev.
326 * %0 on success and a negative error value on failure.
328 * enabled, ccw device lock not held
330 int ccw_device_set_offline(struct ccw_device
*cdev
)
332 struct subchannel
*sch
;
337 if (!cdev
->online
|| !cdev
->drv
)
340 if (cdev
->drv
->set_offline
) {
341 ret
= cdev
->drv
->set_offline(cdev
);
346 spin_lock_irq(cdev
->ccwlock
);
347 sch
= to_subchannel(cdev
->dev
.parent
);
348 /* Wait until a final state or DISCONNECTED is reached */
349 while (!dev_fsm_final_state(cdev
) &&
350 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
351 spin_unlock_irq(cdev
->ccwlock
);
352 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
353 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
354 spin_lock_irq(cdev
->ccwlock
);
357 ret
= ccw_device_offline(cdev
);
360 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
361 "0.%x.%04x\n", ret
, cdev
->private->dev_id
.ssid
,
362 cdev
->private->dev_id
.devno
);
365 state
= cdev
->private->state
;
366 spin_unlock_irq(cdev
->ccwlock
);
367 io_subchannel_quiesce(sch
);
368 spin_lock_irq(cdev
->ccwlock
);
369 cdev
->private->state
= state
;
370 } while (ret
== -EBUSY
);
371 spin_unlock_irq(cdev
->ccwlock
);
372 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
373 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
374 /* Inform the user if set offline failed. */
375 if (cdev
->private->state
== DEV_STATE_BOXED
) {
376 pr_warning("%s: The device entered boxed state while "
377 "being set offline\n", dev_name(&cdev
->dev
));
378 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
379 pr_warning("%s: The device stopped operating while "
380 "being set offline\n", dev_name(&cdev
->dev
));
382 /* Give up reference from ccw_device_set_online(). */
383 put_device(&cdev
->dev
);
387 cdev
->private->state
= DEV_STATE_OFFLINE
;
388 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
389 spin_unlock_irq(cdev
->ccwlock
);
390 /* Give up reference from ccw_device_set_online(). */
391 put_device(&cdev
->dev
);
396 * ccw_device_set_online() - enable a ccw device for I/O
397 * @cdev: target ccw device
399 * This function first enables @cdev and then calls the driver's set_online()
400 * function for @cdev, if given. If set_online() returns an error, @cdev is
403 * %0 on success and a negative error value on failure.
405 * enabled, ccw device lock not held
407 int ccw_device_set_online(struct ccw_device
*cdev
)
414 if (cdev
->online
|| !cdev
->drv
)
416 /* Hold on to an extra reference while device is online. */
417 if (!get_device(&cdev
->dev
))
420 spin_lock_irq(cdev
->ccwlock
);
421 ret
= ccw_device_online(cdev
);
422 spin_unlock_irq(cdev
->ccwlock
);
424 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
426 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
427 "device 0.%x.%04x\n",
428 ret
, cdev
->private->dev_id
.ssid
,
429 cdev
->private->dev_id
.devno
);
430 /* Give up online reference since onlining failed. */
431 put_device(&cdev
->dev
);
434 spin_lock_irq(cdev
->ccwlock
);
435 /* Check if online processing was successful */
436 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
437 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
438 spin_unlock_irq(cdev
->ccwlock
);
439 /* Inform the user that set online failed. */
440 if (cdev
->private->state
== DEV_STATE_BOXED
) {
441 pr_warning("%s: Setting the device online failed "
442 "because it is boxed\n",
443 dev_name(&cdev
->dev
));
444 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
445 pr_warning("%s: Setting the device online failed "
446 "because it is not operational\n",
447 dev_name(&cdev
->dev
));
449 /* Give up online reference since onlining failed. */
450 put_device(&cdev
->dev
);
453 spin_unlock_irq(cdev
->ccwlock
);
454 if (cdev
->drv
->set_online
)
455 ret
= cdev
->drv
->set_online(cdev
);
462 spin_lock_irq(cdev
->ccwlock
);
463 /* Wait until a final state or DISCONNECTED is reached */
464 while (!dev_fsm_final_state(cdev
) &&
465 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
466 spin_unlock_irq(cdev
->ccwlock
);
467 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
468 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
469 spin_lock_irq(cdev
->ccwlock
);
471 ret2
= ccw_device_offline(cdev
);
474 spin_unlock_irq(cdev
->ccwlock
);
475 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
476 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
477 /* Give up online reference since onlining failed. */
478 put_device(&cdev
->dev
);
482 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
483 "device 0.%x.%04x\n",
484 ret2
, cdev
->private->dev_id
.ssid
,
485 cdev
->private->dev_id
.devno
);
486 cdev
->private->state
= DEV_STATE_OFFLINE
;
487 spin_unlock_irq(cdev
->ccwlock
);
488 /* Give up online reference since onlining failed. */
489 put_device(&cdev
->dev
);
493 static int online_store_handle_offline(struct ccw_device
*cdev
)
495 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
) {
496 spin_lock_irq(cdev
->ccwlock
);
497 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
498 spin_unlock_irq(cdev
->ccwlock
);
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
)
506 /* Do device recognition, if needed. */
507 if (cdev
->private->state
== DEV_STATE_BOXED
) {
508 spin_lock_irq(cdev
->ccwlock
);
509 ccw_device_recognition(cdev
);
510 spin_unlock_irq(cdev
->ccwlock
);
511 wait_event(cdev
->private->wait_q
,
512 cdev
->private->flags
.recog_done
);
513 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
514 /* recognition failed */
517 if (cdev
->drv
&& cdev
->drv
->set_online
)
518 ccw_device_set_online(cdev
);
522 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
526 ret
= online_store_recog_and_online(cdev
);
529 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
530 ret
= ccw_device_stlck(cdev
);
533 if (cdev
->id
.cu_type
== 0)
534 cdev
->private->state
= DEV_STATE_NOT_OPER
;
535 ret
= online_store_recog_and_online(cdev
);
542 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
543 const char *buf
, size_t count
)
545 struct ccw_device
*cdev
= to_ccwdev(dev
);
549 if (!dev_fsm_final_state(cdev
) &&
550 cdev
->private->state
!= DEV_STATE_DISCONNECTED
)
552 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
555 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
556 atomic_set(&cdev
->private->onoff
, 0);
559 if (!strncmp(buf
, "force\n", count
)) {
565 ret
= strict_strtoul(buf
, 16, &i
);
571 ret
= online_store_handle_offline(cdev
);
574 ret
= online_store_handle_online(cdev
, force
);
581 module_put(cdev
->drv
->owner
);
582 atomic_set(&cdev
->private->onoff
, 0);
583 return (ret
< 0) ? ret
: count
;
587 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
589 struct ccw_device
*cdev
= to_ccwdev(dev
);
590 struct subchannel
*sch
;
592 if (ccw_device_is_orphan(cdev
))
593 return sprintf(buf
, "no device\n");
594 switch (cdev
->private->state
) {
595 case DEV_STATE_BOXED
:
596 return sprintf(buf
, "boxed\n");
597 case DEV_STATE_DISCONNECTED
:
598 case DEV_STATE_DISCONNECTED_SENSE_ID
:
599 case DEV_STATE_NOT_OPER
:
600 sch
= to_subchannel(dev
->parent
);
602 return sprintf(buf
, "no path\n");
604 return sprintf(buf
, "no device\n");
606 /* All other states considered fine. */
607 return sprintf(buf
, "good\n");
611 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
612 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
613 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
614 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
615 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
616 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
617 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
619 static struct attribute
*io_subchannel_attrs
[] = {
620 &dev_attr_chpids
.attr
,
621 &dev_attr_pimpampom
.attr
,
625 static struct attribute_group io_subchannel_attr_group
= {
626 .attrs
= io_subchannel_attrs
,
629 static struct attribute
* ccwdev_attrs
[] = {
630 &dev_attr_devtype
.attr
,
631 &dev_attr_cutype
.attr
,
632 &dev_attr_modalias
.attr
,
633 &dev_attr_online
.attr
,
634 &dev_attr_cmb_enable
.attr
,
635 &dev_attr_availability
.attr
,
639 static struct attribute_group ccwdev_attr_group
= {
640 .attrs
= ccwdev_attrs
,
643 static const struct attribute_group
*ccwdev_attr_groups
[] = {
648 /* this is a simple abstraction for device_register that sets the
649 * correct bus type and adds the bus specific files */
650 static int ccw_device_register(struct ccw_device
*cdev
)
652 struct device
*dev
= &cdev
->dev
;
655 dev
->bus
= &ccw_bus_type
;
656 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
657 cdev
->private->dev_id
.devno
);
660 return device_add(dev
);
663 static int match_dev_id(struct device
*dev
, void *data
)
665 struct ccw_device
*cdev
= to_ccwdev(dev
);
666 struct ccw_dev_id
*dev_id
= data
;
668 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
671 static struct ccw_device
*get_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
)
675 dev
= bus_find_device(&ccw_bus_type
, NULL
, dev_id
, match_dev_id
);
677 return dev
? to_ccwdev(dev
) : NULL
;
680 static void ccw_device_do_unbind_bind(struct ccw_device
*cdev
)
684 if (device_is_registered(&cdev
->dev
)) {
685 device_release_driver(&cdev
->dev
);
686 ret
= device_attach(&cdev
->dev
);
687 WARN_ON(ret
== -ENODEV
);
692 ccw_device_release(struct device
*dev
)
694 struct ccw_device
*cdev
;
696 cdev
= to_ccwdev(dev
);
697 /* Release reference of parent subchannel. */
698 put_device(cdev
->dev
.parent
);
699 kfree(cdev
->private);
703 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
705 struct ccw_device
*cdev
;
707 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
709 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
710 GFP_KERNEL
| GFP_DMA
);
715 return ERR_PTR(-ENOMEM
);
718 static void ccw_device_todo(struct work_struct
*work
);
720 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
721 struct ccw_device
*cdev
)
723 cdev
->private->cdev
= cdev
;
724 atomic_set(&cdev
->private->onoff
, 0);
725 cdev
->dev
.parent
= &sch
->dev
;
726 cdev
->dev
.release
= ccw_device_release
;
727 INIT_WORK(&cdev
->private->todo_work
, ccw_device_todo
);
728 cdev
->dev
.groups
= ccwdev_attr_groups
;
729 /* Do first half of device_register. */
730 device_initialize(&cdev
->dev
);
731 if (!get_device(&sch
->dev
)) {
732 /* Release reference from device_initialize(). */
733 put_device(&cdev
->dev
);
736 cdev
->private->flags
.initialized
= 1;
740 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
742 struct ccw_device
*cdev
;
745 cdev
= io_subchannel_allocate_dev(sch
);
747 ret
= io_subchannel_initialize_dev(sch
, cdev
);
754 static void io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
756 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
758 struct ccw_device
*cdev
;
760 /* Need to allocate a new ccw device. */
761 cdev
= io_subchannel_create_ccwdev(sch
);
763 /* OK, we did everything we could... */
764 css_sch_device_unregister(sch
);
767 /* Start recognition for the new ccw device. */
768 io_subchannel_recog(cdev
, sch
);
772 * Register recognized device.
774 static void io_subchannel_register(struct ccw_device
*cdev
)
776 struct subchannel
*sch
;
780 sch
= to_subchannel(cdev
->dev
.parent
);
782 * Check if subchannel is still registered. It may have become
783 * unregistered if a machine check hit us after finishing
784 * device recognition but before the register work could be
787 if (!device_is_registered(&sch
->dev
))
789 css_update_ssd_info(sch
);
791 * io_subchannel_register() will also be called after device
792 * recognition has been done for a boxed device (which will already
793 * be registered). We need to reprobe since we may now have sense id
796 if (device_is_registered(&cdev
->dev
)) {
798 ret
= device_reprobe(&cdev
->dev
);
800 /* We can't do much here. */
801 CIO_MSG_EVENT(0, "device_reprobe() returned"
802 " %d for 0.%x.%04x\n", ret
,
803 cdev
->private->dev_id
.ssid
,
804 cdev
->private->dev_id
.devno
);
809 * Now we know this subchannel will stay, we can throw
810 * our delayed uevent.
812 dev_set_uevent_suppress(&sch
->dev
, 0);
813 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
814 /* make it known to the system */
815 ret
= ccw_device_register(cdev
);
817 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
818 cdev
->private->dev_id
.ssid
,
819 cdev
->private->dev_id
.devno
, ret
);
820 spin_lock_irqsave(sch
->lock
, flags
);
821 sch_set_cdev(sch
, NULL
);
822 spin_unlock_irqrestore(sch
->lock
, flags
);
823 /* Release initial device reference. */
824 put_device(&cdev
->dev
);
828 cdev
->private->flags
.recog_done
= 1;
829 wake_up(&cdev
->private->wait_q
);
831 if (atomic_dec_and_test(&ccw_device_init_count
))
832 wake_up(&ccw_device_init_wq
);
835 static void ccw_device_call_sch_unregister(struct ccw_device
*cdev
)
837 struct subchannel
*sch
;
839 /* Get subchannel reference for local processing. */
840 if (!get_device(cdev
->dev
.parent
))
842 sch
= to_subchannel(cdev
->dev
.parent
);
843 css_sch_device_unregister(sch
);
844 /* Release subchannel reference for local processing. */
845 put_device(&sch
->dev
);
849 * subchannel recognition done. Called from the state machine.
852 io_subchannel_recog_done(struct ccw_device
*cdev
)
854 if (css_init_done
== 0) {
855 cdev
->private->flags
.recog_done
= 1;
858 switch (cdev
->private->state
) {
859 case DEV_STATE_BOXED
:
860 /* Device did not respond in time. */
861 case DEV_STATE_NOT_OPER
:
862 cdev
->private->flags
.recog_done
= 1;
863 /* Remove device found not operational. */
864 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
865 if (atomic_dec_and_test(&ccw_device_init_count
))
866 wake_up(&ccw_device_init_wq
);
868 case DEV_STATE_OFFLINE
:
870 * We can't register the device in interrupt context so
871 * we schedule a work item.
873 ccw_device_sched_todo(cdev
, CDEV_TODO_REGISTER
);
878 static void io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
880 struct ccw_device_private
*priv
;
882 cdev
->ccwlock
= sch
->lock
;
884 /* Init private data. */
885 priv
= cdev
->private;
886 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
887 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
888 priv
->schid
= sch
->schid
;
889 priv
->state
= DEV_STATE_NOT_OPER
;
890 INIT_LIST_HEAD(&priv
->cmb_list
);
891 init_waitqueue_head(&priv
->wait_q
);
892 init_timer(&priv
->timer
);
894 /* Increase counter of devices currently in recognition. */
895 atomic_inc(&ccw_device_init_count
);
897 /* Start async. device sensing. */
898 spin_lock_irq(sch
->lock
);
899 sch_set_cdev(sch
, cdev
);
900 ccw_device_recognition(cdev
);
901 spin_unlock_irq(sch
->lock
);
904 static int ccw_device_move_to_sch(struct ccw_device
*cdev
,
905 struct subchannel
*sch
)
907 struct subchannel
*old_sch
;
908 int rc
, old_enabled
= 0;
910 old_sch
= to_subchannel(cdev
->dev
.parent
);
911 /* Obtain child reference for new parent. */
912 if (!get_device(&sch
->dev
))
915 if (!sch_is_pseudo_sch(old_sch
)) {
916 spin_lock_irq(old_sch
->lock
);
917 old_enabled
= old_sch
->schib
.pmcw
.ena
;
920 rc
= cio_disable_subchannel(old_sch
);
921 spin_unlock_irq(old_sch
->lock
);
923 /* Release child reference for new parent. */
924 put_device(&sch
->dev
);
929 mutex_lock(&sch
->reg_mutex
);
930 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
931 mutex_unlock(&sch
->reg_mutex
);
933 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
934 cdev
->private->dev_id
.ssid
,
935 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
936 sch
->schib
.pmcw
.dev
, rc
);
938 /* Try to reenable the old subchannel. */
939 spin_lock_irq(old_sch
->lock
);
940 cio_enable_subchannel(old_sch
, (u32
)(addr_t
)old_sch
);
941 spin_unlock_irq(old_sch
->lock
);
943 /* Release child reference for new parent. */
944 put_device(&sch
->dev
);
947 /* Clean up old subchannel. */
948 if (!sch_is_pseudo_sch(old_sch
)) {
949 spin_lock_irq(old_sch
->lock
);
950 sch_set_cdev(old_sch
, NULL
);
951 spin_unlock_irq(old_sch
->lock
);
952 css_schedule_eval(old_sch
->schid
);
954 /* Release child reference for old parent. */
955 put_device(&old_sch
->dev
);
956 /* Initialize new subchannel. */
957 spin_lock_irq(sch
->lock
);
958 cdev
->private->schid
= sch
->schid
;
959 cdev
->ccwlock
= sch
->lock
;
960 if (!sch_is_pseudo_sch(sch
))
961 sch_set_cdev(sch
, cdev
);
962 spin_unlock_irq(sch
->lock
);
963 if (!sch_is_pseudo_sch(sch
))
964 css_update_ssd_info(sch
);
968 static int ccw_device_move_to_orph(struct ccw_device
*cdev
)
970 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
971 struct channel_subsystem
*css
= to_css(sch
->dev
.parent
);
973 return ccw_device_move_to_sch(cdev
, css
->pseudo_subchannel
);
976 static void io_subchannel_irq(struct subchannel
*sch
)
978 struct ccw_device
*cdev
;
980 cdev
= sch_get_cdev(sch
);
982 CIO_TRACE_EVENT(6, "IRQ");
983 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
985 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
988 void io_subchannel_init_config(struct subchannel
*sch
)
990 memset(&sch
->config
, 0, sizeof(sch
->config
));
991 sch
->config
.csense
= 1;
994 static void io_subchannel_init_fields(struct subchannel
*sch
)
996 if (cio_is_console(sch
->schid
))
999 sch
->opm
= chp_get_sch_opm(sch
);
1000 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1001 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1003 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1004 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1005 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1006 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1007 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1009 io_subchannel_init_config(sch
);
1013 * Note: We always return 0 so that we bind to the device even on error.
1014 * This is needed so that our remove function is called on unregister.
1016 static int io_subchannel_probe(struct subchannel
*sch
)
1018 struct ccw_device
*cdev
;
1021 if (cio_is_console(sch
->schid
)) {
1022 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1023 &io_subchannel_attr_group
);
1025 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1026 "attributes for subchannel "
1027 "0.%x.%04x (rc=%d)\n",
1028 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1030 * The console subchannel already has an associated ccw_device.
1031 * Throw the delayed uevent for the subchannel, register
1032 * the ccw_device and exit.
1034 dev_set_uevent_suppress(&sch
->dev
, 0);
1035 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1036 cdev
= sch_get_cdev(sch
);
1037 cdev
->dev
.groups
= ccwdev_attr_groups
;
1038 device_initialize(&cdev
->dev
);
1039 cdev
->private->flags
.initialized
= 1;
1040 ccw_device_register(cdev
);
1042 * Check if the device is already online. If it is
1043 * the reference count needs to be corrected since we
1044 * didn't obtain a reference in ccw_device_set_online.
1046 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1047 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1048 cdev
->private->state
!= DEV_STATE_BOXED
)
1049 get_device(&cdev
->dev
);
1052 io_subchannel_init_fields(sch
);
1053 rc
= cio_commit_config(sch
);
1056 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1057 &io_subchannel_attr_group
);
1060 /* Allocate I/O subchannel private data. */
1061 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1062 GFP_KERNEL
| GFP_DMA
);
1065 css_schedule_eval(sch
->schid
);
1069 spin_lock_irq(sch
->lock
);
1070 css_sched_sch_todo(sch
, SCH_TODO_UNREG
);
1071 spin_unlock_irq(sch
->lock
);
1076 io_subchannel_remove (struct subchannel
*sch
)
1078 struct ccw_device
*cdev
;
1080 cdev
= sch_get_cdev(sch
);
1083 io_subchannel_quiesce(sch
);
1084 /* Set ccw device to not operational and drop reference. */
1085 spin_lock_irq(cdev
->ccwlock
);
1086 sch_set_cdev(sch
, NULL
);
1087 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1088 spin_unlock_irq(cdev
->ccwlock
);
1089 ccw_device_unregister(cdev
);
1091 kfree(sch
->private);
1092 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1096 static void io_subchannel_verify(struct subchannel
*sch
)
1098 struct ccw_device
*cdev
;
1100 cdev
= sch_get_cdev(sch
);
1102 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1105 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1107 struct ccw_device
*cdev
;
1109 cdev
= sch_get_cdev(sch
);
1112 if (cio_update_schib(sch
))
1114 /* Check for I/O on path. */
1115 if (scsw_actl(&sch
->schib
.scsw
) == 0 || sch
->schib
.pmcw
.lpum
!= mask
)
1117 if (cdev
->private->state
== DEV_STATE_ONLINE
) {
1118 ccw_device_kill_io(cdev
);
1124 /* Trigger path verification. */
1125 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1129 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1132 static int io_subchannel_chp_event(struct subchannel
*sch
,
1133 struct chp_link
*link
, int event
)
1137 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1144 io_subchannel_terminate_path(sch
, mask
);
1149 io_subchannel_verify(sch
);
1152 if (cio_update_schib(sch
))
1154 io_subchannel_terminate_path(sch
, mask
);
1157 if (cio_update_schib(sch
))
1159 sch
->lpm
|= mask
& sch
->opm
;
1160 io_subchannel_verify(sch
);
1166 static void io_subchannel_quiesce(struct subchannel
*sch
)
1168 struct ccw_device
*cdev
;
1171 spin_lock_irq(sch
->lock
);
1172 cdev
= sch_get_cdev(sch
);
1173 if (cio_is_console(sch
->schid
))
1175 if (!sch
->schib
.pmcw
.ena
)
1177 ret
= cio_disable_subchannel(sch
);
1181 cdev
->handler(cdev
, cdev
->private->intparm
, ERR_PTR(-EIO
));
1182 while (ret
== -EBUSY
) {
1183 cdev
->private->state
= DEV_STATE_QUIESCE
;
1184 ret
= ccw_device_cancel_halt_clear(cdev
);
1185 if (ret
== -EBUSY
) {
1186 ccw_device_set_timeout(cdev
, HZ
/10);
1187 spin_unlock_irq(sch
->lock
);
1188 wait_event(cdev
->private->wait_q
,
1189 cdev
->private->state
!= DEV_STATE_QUIESCE
);
1190 spin_lock_irq(sch
->lock
);
1192 ret
= cio_disable_subchannel(sch
);
1195 spin_unlock_irq(sch
->lock
);
1198 static void io_subchannel_shutdown(struct subchannel
*sch
)
1200 io_subchannel_quiesce(sch
);
1203 static int device_is_disconnected(struct ccw_device
*cdev
)
1207 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1208 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1211 static int recovery_check(struct device
*dev
, void *data
)
1213 struct ccw_device
*cdev
= to_ccwdev(dev
);
1216 spin_lock_irq(cdev
->ccwlock
);
1217 switch (cdev
->private->state
) {
1218 case DEV_STATE_DISCONNECTED
:
1219 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1220 cdev
->private->dev_id
.ssid
,
1221 cdev
->private->dev_id
.devno
);
1222 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1225 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1229 spin_unlock_irq(cdev
->ccwlock
);
1234 static void recovery_work_func(struct work_struct
*unused
)
1238 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1240 spin_lock_irq(&recovery_lock
);
1241 if (!timer_pending(&recovery_timer
)) {
1242 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1244 mod_timer(&recovery_timer
, jiffies
+
1245 recovery_delay
[recovery_phase
] * HZ
);
1247 spin_unlock_irq(&recovery_lock
);
1249 CIO_MSG_EVENT(4, "recovery: end\n");
1252 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1254 static void recovery_func(unsigned long data
)
1257 * We can't do our recovery in softirq context and it's not
1258 * performance critical, so we schedule it.
1260 schedule_work(&recovery_work
);
1263 static void ccw_device_schedule_recovery(void)
1265 unsigned long flags
;
1267 CIO_MSG_EVENT(4, "recovery: schedule\n");
1268 spin_lock_irqsave(&recovery_lock
, flags
);
1269 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1271 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1273 spin_unlock_irqrestore(&recovery_lock
, flags
);
1276 static int purge_fn(struct device
*dev
, void *data
)
1278 struct ccw_device
*cdev
= to_ccwdev(dev
);
1279 struct ccw_dev_id
*id
= &cdev
->private->dev_id
;
1281 spin_lock_irq(cdev
->ccwlock
);
1282 if (is_blacklisted(id
->ssid
, id
->devno
) &&
1283 (cdev
->private->state
== DEV_STATE_OFFLINE
)) {
1284 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id
->ssid
,
1286 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1288 spin_unlock_irq(cdev
->ccwlock
);
1289 /* Abort loop in case of pending signal. */
1290 if (signal_pending(current
))
1297 * ccw_purge_blacklisted - purge unused, blacklisted devices
1299 * Unregister all ccw devices that are offline and on the blacklist.
1301 int ccw_purge_blacklisted(void)
1303 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1304 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1308 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1312 ccw_device_set_timeout(cdev
, 0);
1313 cdev
->private->flags
.fake_irb
= 0;
1314 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1316 ccw_device_schedule_recovery();
1319 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1321 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1323 CIO_TRACE_EVENT(2, "notoper");
1324 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1325 ccw_device_set_timeout(cdev
, 0);
1326 cio_disable_subchannel(sch
);
1327 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1330 enum io_sch_action
{
1334 IO_SCH_UNREG_ATTACH
,
1342 static enum io_sch_action
sch_get_action(struct subchannel
*sch
)
1344 struct ccw_device
*cdev
;
1346 cdev
= sch_get_cdev(sch
);
1347 if (cio_update_schib(sch
)) {
1348 /* Not operational. */
1350 return IO_SCH_UNREG
;
1351 if (!ccw_device_notify(cdev
, CIO_GONE
))
1352 return IO_SCH_UNREG
;
1353 return IO_SCH_ORPH_UNREG
;
1357 return IO_SCH_ATTACH
;
1358 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1359 if (!ccw_device_notify(cdev
, CIO_GONE
))
1360 return IO_SCH_UNREG_ATTACH
;
1361 return IO_SCH_ORPH_ATTACH
;
1363 if ((sch
->schib
.pmcw
.pam
& sch
->opm
) == 0) {
1364 if (!ccw_device_notify(cdev
, CIO_NO_PATH
))
1365 return IO_SCH_UNREG
;
1368 if (device_is_disconnected(cdev
))
1369 return IO_SCH_REPROBE
;
1371 return IO_SCH_VERIFY
;
1376 * io_subchannel_sch_event - process subchannel event
1378 * @process: non-zero if function is called in process context
1380 * An unspecified event occurred for this subchannel. Adjust data according
1381 * to the current operational state of the subchannel and device. Return
1382 * zero when the event has been handled sufficiently or -EAGAIN when this
1383 * function should be called again in process context.
1385 static int io_subchannel_sch_event(struct subchannel
*sch
, int process
)
1387 unsigned long flags
;
1388 struct ccw_device
*cdev
;
1389 struct ccw_dev_id dev_id
;
1390 enum io_sch_action action
;
1393 spin_lock_irqsave(sch
->lock
, flags
);
1394 if (!device_is_registered(&sch
->dev
))
1396 if (work_pending(&sch
->todo_work
))
1398 cdev
= sch_get_cdev(sch
);
1399 if (cdev
&& work_pending(&cdev
->private->todo_work
))
1401 action
= sch_get_action(sch
);
1402 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1403 sch
->schid
.ssid
, sch
->schid
.sch_no
, process
,
1405 /* Perform immediate actions while holding the lock. */
1407 case IO_SCH_REPROBE
:
1408 /* Trigger device recognition. */
1409 ccw_device_trigger_reprobe(cdev
);
1413 /* Trigger path verification. */
1414 io_subchannel_verify(sch
);
1418 ccw_device_set_disconnected(cdev
);
1421 case IO_SCH_ORPH_UNREG
:
1422 case IO_SCH_ORPH_ATTACH
:
1423 ccw_device_set_disconnected(cdev
);
1425 case IO_SCH_UNREG_ATTACH
:
1428 ccw_device_set_notoper(cdev
);
1436 spin_unlock_irqrestore(sch
->lock
, flags
);
1437 /* All other actions require process context. */
1440 /* Handle attached ccw device. */
1442 case IO_SCH_ORPH_UNREG
:
1443 case IO_SCH_ORPH_ATTACH
:
1444 /* Move ccw device to orphanage. */
1445 rc
= ccw_device_move_to_orph(cdev
);
1449 case IO_SCH_UNREG_ATTACH
:
1450 /* Unregister ccw device. */
1451 ccw_device_unregister(cdev
);
1456 /* Handle subchannel. */
1458 case IO_SCH_ORPH_UNREG
:
1460 css_sch_device_unregister(sch
);
1462 case IO_SCH_ORPH_ATTACH
:
1463 case IO_SCH_UNREG_ATTACH
:
1465 dev_id
.ssid
= sch
->schid
.ssid
;
1466 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1467 cdev
= get_ccwdev_by_dev_id(&dev_id
);
1469 sch_create_and_recog_new_device(sch
);
1472 rc
= ccw_device_move_to_sch(cdev
, sch
);
1474 /* Release reference from get_ccwdev_by_dev_id() */
1475 put_device(&cdev
->dev
);
1478 spin_lock_irqsave(sch
->lock
, flags
);
1479 ccw_device_trigger_reprobe(cdev
);
1480 spin_unlock_irqrestore(sch
->lock
, flags
);
1481 /* Release reference from get_ccwdev_by_dev_id() */
1482 put_device(&cdev
->dev
);
1490 spin_unlock_irqrestore(sch
->lock
, flags
);
1495 #ifdef CONFIG_CCW_CONSOLE
1496 static struct ccw_device console_cdev
;
1497 static struct ccw_device_private console_private
;
1498 static int console_cdev_in_use
;
1500 static DEFINE_SPINLOCK(ccw_console_lock
);
1502 spinlock_t
* cio_get_console_lock(void)
1504 return &ccw_console_lock
;
1507 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1508 struct subchannel
*sch
)
1512 /* Attach subchannel private data. */
1513 sch
->private = cio_get_console_priv();
1514 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1515 io_subchannel_init_fields(sch
);
1516 rc
= cio_commit_config(sch
);
1519 sch
->driver
= &io_subchannel_driver
;
1520 /* Initialize the ccw_device structure. */
1521 cdev
->dev
.parent
= &sch
->dev
;
1522 io_subchannel_recog(cdev
, sch
);
1523 /* Now wait for the async. recognition to come to an end. */
1524 spin_lock_irq(cdev
->ccwlock
);
1525 while (!dev_fsm_final_state(cdev
))
1528 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1530 ccw_device_online(cdev
);
1531 while (!dev_fsm_final_state(cdev
))
1533 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1537 spin_unlock_irq(cdev
->ccwlock
);
1542 ccw_device_probe_console(void)
1544 struct subchannel
*sch
;
1547 if (xchg(&console_cdev_in_use
, 1) != 0)
1548 return ERR_PTR(-EBUSY
);
1549 sch
= cio_probe_console();
1551 console_cdev_in_use
= 0;
1552 return (void *) sch
;
1554 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1555 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1556 console_cdev
.private = &console_private
;
1557 console_private
.cdev
= &console_cdev
;
1558 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1560 cio_release_console();
1561 console_cdev_in_use
= 0;
1562 return ERR_PTR(ret
);
1564 console_cdev
.online
= 1;
1565 return &console_cdev
;
1568 static int ccw_device_pm_restore(struct device
*dev
);
1570 int ccw_device_force_console(void)
1572 if (!console_cdev_in_use
)
1574 return ccw_device_pm_restore(&console_cdev
.dev
);
1576 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1580 * get ccw_device matching the busid, but only if owned by cdrv
1583 __ccwdev_check_busid(struct device
*dev
, void *id
)
1589 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1594 * get_ccwdev_by_busid() - obtain device from a bus id
1595 * @cdrv: driver the device is owned by
1596 * @bus_id: bus id of the device to be searched
1598 * This function searches all devices owned by @cdrv for a device with a bus
1599 * id matching @bus_id.
1601 * If a match is found, its reference count of the found device is increased
1602 * and it is returned; else %NULL is returned.
1604 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1608 struct device_driver
*drv
;
1610 drv
= get_driver(&cdrv
->driver
);
1614 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1615 __ccwdev_check_busid
);
1618 return dev
? to_ccwdev(dev
) : NULL
;
1621 /************************** device driver handling ************************/
1623 /* This is the implementation of the ccw_driver class. The probe, remove
1624 * and release methods are initially very similar to the device_driver
1625 * implementations, with the difference that they have ccw_device
1628 * A ccw driver also contains the information that is needed for
1632 ccw_device_probe (struct device
*dev
)
1634 struct ccw_device
*cdev
= to_ccwdev(dev
);
1635 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1638 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1640 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1651 ccw_device_remove (struct device
*dev
)
1653 struct ccw_device
*cdev
= to_ccwdev(dev
);
1654 struct ccw_driver
*cdrv
= cdev
->drv
;
1661 spin_lock_irq(cdev
->ccwlock
);
1662 ret
= ccw_device_offline(cdev
);
1663 spin_unlock_irq(cdev
->ccwlock
);
1665 wait_event(cdev
->private->wait_q
,
1666 dev_fsm_final_state(cdev
));
1668 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1669 "device 0.%x.%04x\n",
1670 ret
, cdev
->private->dev_id
.ssid
,
1671 cdev
->private->dev_id
.devno
);
1672 /* Give up reference obtained in ccw_device_set_online(). */
1673 put_device(&cdev
->dev
);
1675 ccw_device_set_timeout(cdev
, 0);
1680 static void ccw_device_shutdown(struct device
*dev
)
1682 struct ccw_device
*cdev
;
1684 cdev
= to_ccwdev(dev
);
1685 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1686 cdev
->drv
->shutdown(cdev
);
1690 static int ccw_device_pm_prepare(struct device
*dev
)
1692 struct ccw_device
*cdev
= to_ccwdev(dev
);
1694 if (work_pending(&cdev
->private->todo_work
))
1696 /* Fail while device is being set online/offline. */
1697 if (atomic_read(&cdev
->private->onoff
))
1700 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1701 return cdev
->drv
->prepare(cdev
);
1706 static void ccw_device_pm_complete(struct device
*dev
)
1708 struct ccw_device
*cdev
= to_ccwdev(dev
);
1710 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1711 cdev
->drv
->complete(cdev
);
1714 static int ccw_device_pm_freeze(struct device
*dev
)
1716 struct ccw_device
*cdev
= to_ccwdev(dev
);
1717 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1718 int ret
, cm_enabled
;
1720 /* Fail suspend while device is in transistional state. */
1721 if (!dev_fsm_final_state(cdev
))
1725 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1726 ret
= cdev
->drv
->freeze(cdev
);
1731 spin_lock_irq(sch
->lock
);
1732 cm_enabled
= cdev
->private->cmb
!= NULL
;
1733 spin_unlock_irq(sch
->lock
);
1735 /* Don't have the css write on memory. */
1736 ret
= ccw_set_cmf(cdev
, 0);
1740 /* From here on, disallow device driver I/O. */
1741 spin_lock_irq(sch
->lock
);
1742 ret
= cio_disable_subchannel(sch
);
1743 spin_unlock_irq(sch
->lock
);
1748 static int ccw_device_pm_thaw(struct device
*dev
)
1750 struct ccw_device
*cdev
= to_ccwdev(dev
);
1751 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1752 int ret
, cm_enabled
;
1757 spin_lock_irq(sch
->lock
);
1758 /* Allow device driver I/O again. */
1759 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1760 cm_enabled
= cdev
->private->cmb
!= NULL
;
1761 spin_unlock_irq(sch
->lock
);
1766 ret
= ccw_set_cmf(cdev
, 1);
1771 if (cdev
->drv
&& cdev
->drv
->thaw
)
1772 ret
= cdev
->drv
->thaw(cdev
);
1777 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
1779 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1781 if (cio_is_console(sch
->schid
))
1784 * While we were sleeping, devices may have gone or become
1785 * available again. Kick re-detection.
1787 spin_lock_irq(sch
->lock
);
1788 cdev
->private->flags
.resuming
= 1;
1789 ccw_device_recognition(cdev
);
1790 spin_unlock_irq(sch
->lock
);
1791 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
1792 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
1794 cdev
->private->flags
.resuming
= 0;
1797 static int resume_handle_boxed(struct ccw_device
*cdev
)
1799 cdev
->private->state
= DEV_STATE_BOXED
;
1800 if (ccw_device_notify(cdev
, CIO_BOXED
))
1802 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1806 static int resume_handle_disc(struct ccw_device
*cdev
)
1808 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1809 if (ccw_device_notify(cdev
, CIO_GONE
))
1811 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1815 static int ccw_device_pm_restore(struct device
*dev
)
1817 struct ccw_device
*cdev
= to_ccwdev(dev
);
1818 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1819 int ret
= 0, cm_enabled
;
1821 __ccw_device_pm_restore(cdev
);
1822 spin_lock_irq(sch
->lock
);
1823 if (cio_is_console(sch
->schid
)) {
1824 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1825 spin_unlock_irq(sch
->lock
);
1828 cdev
->private->flags
.donotify
= 0;
1829 /* check recognition results */
1830 switch (cdev
->private->state
) {
1831 case DEV_STATE_OFFLINE
:
1833 case DEV_STATE_BOXED
:
1834 ret
= resume_handle_boxed(cdev
);
1835 spin_unlock_irq(sch
->lock
);
1839 case DEV_STATE_DISCONNECTED
:
1840 goto out_disc_unlock
;
1842 goto out_unreg_unlock
;
1844 /* check if the device id has changed */
1845 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1846 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
1847 "changed from %04x to %04x)\n",
1848 sch
->schid
.ssid
, sch
->schid
.sch_no
,
1849 cdev
->private->dev_id
.devno
,
1850 sch
->schib
.pmcw
.dev
);
1851 goto out_unreg_unlock
;
1853 /* check if the device type has changed */
1854 if (!ccw_device_test_sense_data(cdev
)) {
1855 ccw_device_update_sense_data(cdev
);
1856 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
1860 if (!cdev
->online
) {
1864 ret
= ccw_device_online(cdev
);
1866 goto out_disc_unlock
;
1868 cm_enabled
= cdev
->private->cmb
!= NULL
;
1869 spin_unlock_irq(sch
->lock
);
1871 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1872 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
1873 spin_lock_irq(sch
->lock
);
1874 goto out_disc_unlock
;
1877 ret
= ccw_set_cmf(cdev
, 1);
1879 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1880 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
1881 cdev
->private->dev_id
.devno
, ret
);
1887 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
1888 ret
= cdev
->drv
->restore(cdev
);
1893 ret
= resume_handle_disc(cdev
);
1894 spin_unlock_irq(sch
->lock
);
1900 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
1903 spin_unlock_irq(sch
->lock
);
1907 static const struct dev_pm_ops ccw_pm_ops
= {
1908 .prepare
= ccw_device_pm_prepare
,
1909 .complete
= ccw_device_pm_complete
,
1910 .freeze
= ccw_device_pm_freeze
,
1911 .thaw
= ccw_device_pm_thaw
,
1912 .restore
= ccw_device_pm_restore
,
1915 struct bus_type ccw_bus_type
= {
1917 .match
= ccw_bus_match
,
1918 .uevent
= ccw_uevent
,
1919 .probe
= ccw_device_probe
,
1920 .remove
= ccw_device_remove
,
1921 .shutdown
= ccw_device_shutdown
,
1926 * ccw_driver_register() - register a ccw driver
1927 * @cdriver: driver to be registered
1929 * This function is mainly a wrapper around driver_register().
1931 * %0 on success and a negative error value on failure.
1933 int ccw_driver_register(struct ccw_driver
*cdriver
)
1935 struct device_driver
*drv
= &cdriver
->driver
;
1937 drv
->bus
= &ccw_bus_type
;
1938 drv
->name
= cdriver
->name
;
1939 drv
->owner
= cdriver
->owner
;
1941 return driver_register(drv
);
1945 * ccw_driver_unregister() - deregister a ccw driver
1946 * @cdriver: driver to be deregistered
1948 * This function is mainly a wrapper around driver_unregister().
1950 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
1952 driver_unregister(&cdriver
->driver
);
1955 /* Helper func for qdio. */
1956 struct subchannel_id
1957 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1959 struct subchannel
*sch
;
1961 sch
= to_subchannel(cdev
->dev
.parent
);
1965 static void ccw_device_todo(struct work_struct
*work
)
1967 struct ccw_device_private
*priv
;
1968 struct ccw_device
*cdev
;
1969 struct subchannel
*sch
;
1970 enum cdev_todo todo
;
1972 priv
= container_of(work
, struct ccw_device_private
, todo_work
);
1974 sch
= to_subchannel(cdev
->dev
.parent
);
1975 /* Find out todo. */
1976 spin_lock_irq(cdev
->ccwlock
);
1978 priv
->todo
= CDEV_TODO_NOTHING
;
1979 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1980 priv
->dev_id
.ssid
, priv
->dev_id
.devno
, todo
);
1981 spin_unlock_irq(cdev
->ccwlock
);
1984 case CDEV_TODO_ENABLE_CMF
:
1987 case CDEV_TODO_REBIND
:
1988 ccw_device_do_unbind_bind(cdev
);
1990 case CDEV_TODO_REGISTER
:
1991 io_subchannel_register(cdev
);
1993 case CDEV_TODO_UNREG_EVAL
:
1994 if (!sch_is_pseudo_sch(sch
))
1995 css_schedule_eval(sch
->schid
);
1997 case CDEV_TODO_UNREG
:
1998 if (sch_is_pseudo_sch(sch
))
1999 ccw_device_unregister(cdev
);
2001 ccw_device_call_sch_unregister(cdev
);
2006 /* Release workqueue ref. */
2007 put_device(&cdev
->dev
);
2011 * ccw_device_sched_todo - schedule ccw device operation
2015 * Schedule the operation identified by @todo to be performed on the slow path
2016 * workqueue. Do nothing if another operation with higher priority is already
2017 * scheduled. Needs to be called with ccwdev lock held.
2019 void ccw_device_sched_todo(struct ccw_device
*cdev
, enum cdev_todo todo
)
2021 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2022 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
2024 if (cdev
->private->todo
>= todo
)
2026 cdev
->private->todo
= todo
;
2027 /* Get workqueue ref. */
2028 if (!get_device(&cdev
->dev
))
2030 if (!queue_work(slow_path_wq
, &cdev
->private->todo_work
)) {
2031 /* Already queued, release workqueue ref. */
2032 put_device(&cdev
->dev
);
2036 MODULE_LICENSE("GPL");
2037 EXPORT_SYMBOL(ccw_device_set_online
);
2038 EXPORT_SYMBOL(ccw_device_set_offline
);
2039 EXPORT_SYMBOL(ccw_driver_register
);
2040 EXPORT_SYMBOL(ccw_driver_unregister
);
2041 EXPORT_SYMBOL(get_ccwdev_by_busid
);
2042 EXPORT_SYMBOL(ccw_bus_type
);
2043 EXPORT_SYMBOL(ccw_device_work
);
2044 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);