2 * bus driver for ccw devices
4 * Copyright IBM Corp. 2002, 2008
5 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #define KMSG_COMPONENT "cio"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/spinlock.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/slab.h>
19 #include <linux/list.h>
20 #include <linux/device.h>
21 #include <linux/workqueue.h>
22 #include <linux/timer.h>
23 #include <linux/kernel_stat.h>
25 #include <asm/ccwdev.h>
27 #include <asm/param.h> /* HZ */
33 #include "cio_debug.h"
38 #include "blacklist.h"
41 static struct timer_list recovery_timer
;
42 static DEFINE_SPINLOCK(recovery_lock
);
43 static int recovery_phase
;
44 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
46 /******************* bus type handling ***********************/
48 /* The Linux driver model distinguishes between a bus type and
49 * the bus itself. Of course we only have one channel
50 * subsystem driver and one channel system per machine, but
51 * we still use the abstraction. T.R. says it's a good idea. */
53 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
55 struct ccw_device
*cdev
= to_ccwdev(dev
);
56 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
57 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
62 found
= ccw_device_id_match(ids
, &cdev
->id
);
66 cdev
->id
.driver_info
= found
->driver_info
;
71 /* Store modalias string delimited by prefix/suffix string into buffer with
72 * specified size. Return length of resulting string (excluding trailing '\0')
73 * even if string doesn't fit buffer (snprintf semantics). */
74 static int snprint_alias(char *buf
, size_t size
,
75 struct ccw_device_id
*id
, const char *suffix
)
79 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
85 if (id
->dev_type
!= 0)
86 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
87 id
->dev_model
, suffix
);
89 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
94 /* Set up environment variables for ccw device uevent. Return 0 on success,
95 * non-zero otherwise. */
96 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
98 struct ccw_device
*cdev
= to_ccwdev(dev
);
99 struct ccw_device_id
*id
= &(cdev
->id
);
101 char modalias_buf
[30];
104 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
109 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
113 /* The next two can be zero, that's ok for us */
115 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
120 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
125 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
126 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
130 static struct bus_type ccw_bus_type
;
132 static void io_subchannel_irq(struct subchannel
*);
133 static int io_subchannel_probe(struct subchannel
*);
134 static int io_subchannel_remove(struct subchannel
*);
135 static void io_subchannel_shutdown(struct subchannel
*);
136 static int io_subchannel_sch_event(struct subchannel
*, int);
137 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
139 static void recovery_func(unsigned long data
);
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 int io_subchannel_settle(void)
166 ret
= wait_event_interruptible(ccw_device_init_wq
,
167 atomic_read(&ccw_device_init_count
) == 0);
170 flush_workqueue(cio_work_q
);
174 static struct css_driver io_subchannel_driver
= {
176 .owner
= THIS_MODULE
,
177 .name
= "io_subchannel",
179 .subchannel_type
= io_subchannel_ids
,
180 .irq
= io_subchannel_irq
,
181 .sch_event
= io_subchannel_sch_event
,
182 .chp_event
= io_subchannel_chp_event
,
183 .probe
= io_subchannel_probe
,
184 .remove
= io_subchannel_remove
,
185 .shutdown
= io_subchannel_shutdown
,
186 .prepare
= io_subchannel_prepare
,
187 .settle
= io_subchannel_settle
,
190 int __init
io_subchannel_init(void)
194 init_waitqueue_head(&ccw_device_init_wq
);
195 atomic_set(&ccw_device_init_count
, 0);
196 setup_timer(&recovery_timer
, recovery_func
, 0);
198 ret
= bus_register(&ccw_bus_type
);
201 ret
= css_driver_register(&io_subchannel_driver
);
203 bus_unregister(&ccw_bus_type
);
209 /************************ device handling **************************/
212 * A ccw_device has some interfaces in sysfs in addition to the
214 * The following entries are designed to export the information which
215 * resided in 2.4 in /proc/subchannels. Subchannel and device number
216 * are obvious, so they don't have an entry :)
217 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
220 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
222 struct subchannel
*sch
= to_subchannel(dev
);
223 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
228 for (chp
= 0; chp
< 8; chp
++) {
230 if (ssd
->path_mask
& mask
)
231 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
233 ret
+= sprintf(buf
+ ret
, "00 ");
235 ret
+= sprintf (buf
+ret
, "\n");
236 return min((ssize_t
)PAGE_SIZE
, ret
);
240 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
242 struct subchannel
*sch
= to_subchannel(dev
);
243 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
245 return sprintf (buf
, "%02x %02x %02x\n",
246 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
250 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
252 struct ccw_device
*cdev
= to_ccwdev(dev
);
253 struct ccw_device_id
*id
= &(cdev
->id
);
255 if (id
->dev_type
!= 0)
256 return sprintf(buf
, "%04x/%02x\n",
257 id
->dev_type
, id
->dev_model
);
259 return sprintf(buf
, "n/a\n");
263 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
265 struct ccw_device
*cdev
= to_ccwdev(dev
);
266 struct ccw_device_id
*id
= &(cdev
->id
);
268 return sprintf(buf
, "%04x/%02x\n",
269 id
->cu_type
, id
->cu_model
);
273 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
275 struct ccw_device
*cdev
= to_ccwdev(dev
);
276 struct ccw_device_id
*id
= &(cdev
->id
);
279 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
281 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
285 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
287 struct ccw_device
*cdev
= to_ccwdev(dev
);
289 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
292 int ccw_device_is_orphan(struct ccw_device
*cdev
)
294 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
297 static void ccw_device_unregister(struct ccw_device
*cdev
)
299 if (device_is_registered(&cdev
->dev
)) {
300 /* Undo device_add(). */
301 device_del(&cdev
->dev
);
303 if (cdev
->private->flags
.initialized
) {
304 cdev
->private->flags
.initialized
= 0;
305 /* Release reference from device_initialize(). */
306 put_device(&cdev
->dev
);
310 static void io_subchannel_quiesce(struct subchannel
*);
313 * ccw_device_set_offline() - disable a ccw device for I/O
314 * @cdev: target ccw device
316 * This function calls the driver's set_offline() function for @cdev, if
317 * given, and then disables @cdev.
319 * %0 on success and a negative error value on failure.
321 * enabled, ccw device lock not held
323 int ccw_device_set_offline(struct ccw_device
*cdev
)
325 struct subchannel
*sch
;
330 if (!cdev
->online
|| !cdev
->drv
)
333 if (cdev
->drv
->set_offline
) {
334 ret
= cdev
->drv
->set_offline(cdev
);
339 spin_lock_irq(cdev
->ccwlock
);
340 sch
= to_subchannel(cdev
->dev
.parent
);
341 /* Wait until a final state or DISCONNECTED is reached */
342 while (!dev_fsm_final_state(cdev
) &&
343 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
344 spin_unlock_irq(cdev
->ccwlock
);
345 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
346 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
347 spin_lock_irq(cdev
->ccwlock
);
350 ret
= ccw_device_offline(cdev
);
353 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
354 "0.%x.%04x\n", ret
, cdev
->private->dev_id
.ssid
,
355 cdev
->private->dev_id
.devno
);
358 state
= cdev
->private->state
;
359 spin_unlock_irq(cdev
->ccwlock
);
360 io_subchannel_quiesce(sch
);
361 spin_lock_irq(cdev
->ccwlock
);
362 cdev
->private->state
= state
;
363 } while (ret
== -EBUSY
);
364 spin_unlock_irq(cdev
->ccwlock
);
365 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
366 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
367 /* Inform the user if set offline failed. */
368 if (cdev
->private->state
== DEV_STATE_BOXED
) {
369 pr_warning("%s: The device entered boxed state while "
370 "being set offline\n", dev_name(&cdev
->dev
));
371 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
372 pr_warning("%s: The device stopped operating while "
373 "being set offline\n", dev_name(&cdev
->dev
));
375 /* Give up reference from ccw_device_set_online(). */
376 put_device(&cdev
->dev
);
380 cdev
->private->state
= DEV_STATE_OFFLINE
;
381 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
382 spin_unlock_irq(cdev
->ccwlock
);
383 /* Give up reference from ccw_device_set_online(). */
384 put_device(&cdev
->dev
);
389 * ccw_device_set_online() - enable a ccw device for I/O
390 * @cdev: target ccw device
392 * This function first enables @cdev and then calls the driver's set_online()
393 * function for @cdev, if given. If set_online() returns an error, @cdev is
396 * %0 on success and a negative error value on failure.
398 * enabled, ccw device lock not held
400 int ccw_device_set_online(struct ccw_device
*cdev
)
407 if (cdev
->online
|| !cdev
->drv
)
409 /* Hold on to an extra reference while device is online. */
410 if (!get_device(&cdev
->dev
))
413 spin_lock_irq(cdev
->ccwlock
);
414 ret
= ccw_device_online(cdev
);
415 spin_unlock_irq(cdev
->ccwlock
);
417 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
419 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
420 "device 0.%x.%04x\n",
421 ret
, cdev
->private->dev_id
.ssid
,
422 cdev
->private->dev_id
.devno
);
423 /* Give up online reference since onlining failed. */
424 put_device(&cdev
->dev
);
427 spin_lock_irq(cdev
->ccwlock
);
428 /* Check if online processing was successful */
429 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
430 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
431 spin_unlock_irq(cdev
->ccwlock
);
432 /* Inform the user that set online failed. */
433 if (cdev
->private->state
== DEV_STATE_BOXED
) {
434 pr_warning("%s: Setting the device online failed "
435 "because it is boxed\n",
436 dev_name(&cdev
->dev
));
437 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
438 pr_warning("%s: Setting the device online failed "
439 "because it is not operational\n",
440 dev_name(&cdev
->dev
));
442 /* Give up online reference since onlining failed. */
443 put_device(&cdev
->dev
);
446 spin_unlock_irq(cdev
->ccwlock
);
447 if (cdev
->drv
->set_online
)
448 ret
= cdev
->drv
->set_online(cdev
);
455 spin_lock_irq(cdev
->ccwlock
);
456 /* Wait until a final state or DISCONNECTED is reached */
457 while (!dev_fsm_final_state(cdev
) &&
458 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
459 spin_unlock_irq(cdev
->ccwlock
);
460 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
461 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
462 spin_lock_irq(cdev
->ccwlock
);
464 ret2
= ccw_device_offline(cdev
);
467 spin_unlock_irq(cdev
->ccwlock
);
468 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
469 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
470 /* Give up online reference since onlining failed. */
471 put_device(&cdev
->dev
);
475 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
476 "device 0.%x.%04x\n",
477 ret2
, cdev
->private->dev_id
.ssid
,
478 cdev
->private->dev_id
.devno
);
479 cdev
->private->state
= DEV_STATE_OFFLINE
;
480 spin_unlock_irq(cdev
->ccwlock
);
481 /* Give up online reference since onlining failed. */
482 put_device(&cdev
->dev
);
486 static int online_store_handle_offline(struct ccw_device
*cdev
)
488 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
) {
489 spin_lock_irq(cdev
->ccwlock
);
490 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
491 spin_unlock_irq(cdev
->ccwlock
);
494 if (cdev
->drv
&& cdev
->drv
->set_offline
)
495 return ccw_device_set_offline(cdev
);
499 static int online_store_recog_and_online(struct ccw_device
*cdev
)
501 /* Do device recognition, if needed. */
502 if (cdev
->private->state
== DEV_STATE_BOXED
) {
503 spin_lock_irq(cdev
->ccwlock
);
504 ccw_device_recognition(cdev
);
505 spin_unlock_irq(cdev
->ccwlock
);
506 wait_event(cdev
->private->wait_q
,
507 cdev
->private->flags
.recog_done
);
508 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
509 /* recognition failed */
512 if (cdev
->drv
&& cdev
->drv
->set_online
)
513 return ccw_device_set_online(cdev
);
517 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
521 ret
= online_store_recog_and_online(cdev
);
524 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
525 ret
= ccw_device_stlck(cdev
);
528 if (cdev
->id
.cu_type
== 0)
529 cdev
->private->state
= DEV_STATE_NOT_OPER
;
530 ret
= online_store_recog_and_online(cdev
);
537 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
538 const char *buf
, size_t count
)
540 struct ccw_device
*cdev
= to_ccwdev(dev
);
544 /* Prevent conflict between multiple on-/offline processing requests. */
545 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
547 /* Prevent conflict between internal I/Os and on-/offline processing. */
548 if (!dev_fsm_final_state(cdev
) &&
549 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
553 /* Prevent conflict between pending work and on-/offline processing.*/
554 if (work_pending(&cdev
->private->todo_work
)) {
559 if (cdev
->drv
&& !try_module_get(cdev
->drv
->driver
.owner
)) {
563 if (!strncmp(buf
, "force\n", count
)) {
569 ret
= strict_strtoul(buf
, 16, &i
);
575 ret
= online_store_handle_offline(cdev
);
578 ret
= online_store_handle_online(cdev
, force
);
585 module_put(cdev
->drv
->driver
.owner
);
587 atomic_set(&cdev
->private->onoff
, 0);
588 return (ret
< 0) ? ret
: count
;
592 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
594 struct ccw_device
*cdev
= to_ccwdev(dev
);
595 struct subchannel
*sch
;
597 if (ccw_device_is_orphan(cdev
))
598 return sprintf(buf
, "no device\n");
599 switch (cdev
->private->state
) {
600 case DEV_STATE_BOXED
:
601 return sprintf(buf
, "boxed\n");
602 case DEV_STATE_DISCONNECTED
:
603 case DEV_STATE_DISCONNECTED_SENSE_ID
:
604 case DEV_STATE_NOT_OPER
:
605 sch
= to_subchannel(dev
->parent
);
607 return sprintf(buf
, "no path\n");
609 return sprintf(buf
, "no device\n");
611 /* All other states considered fine. */
612 return sprintf(buf
, "good\n");
617 initiate_logging(struct device
*dev
, struct device_attribute
*attr
,
618 const char *buf
, size_t count
)
620 struct subchannel
*sch
= to_subchannel(dev
);
623 rc
= chsc_siosl(sch
->schid
);
625 pr_warning("Logging for subchannel 0.%x.%04x failed with "
627 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
630 pr_notice("Logging for subchannel 0.%x.%04x was triggered\n",
631 sch
->schid
.ssid
, sch
->schid
.sch_no
);
635 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
636 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
637 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
638 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
639 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
640 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
641 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
642 static DEVICE_ATTR(logging
, 0200, NULL
, initiate_logging
);
644 static struct attribute
*io_subchannel_attrs
[] = {
645 &dev_attr_chpids
.attr
,
646 &dev_attr_pimpampom
.attr
,
647 &dev_attr_logging
.attr
,
651 static struct attribute_group io_subchannel_attr_group
= {
652 .attrs
= io_subchannel_attrs
,
655 static struct attribute
* ccwdev_attrs
[] = {
656 &dev_attr_devtype
.attr
,
657 &dev_attr_cutype
.attr
,
658 &dev_attr_modalias
.attr
,
659 &dev_attr_online
.attr
,
660 &dev_attr_cmb_enable
.attr
,
661 &dev_attr_availability
.attr
,
665 static struct attribute_group ccwdev_attr_group
= {
666 .attrs
= ccwdev_attrs
,
669 static const struct attribute_group
*ccwdev_attr_groups
[] = {
674 /* this is a simple abstraction for device_register that sets the
675 * correct bus type and adds the bus specific files */
676 static int ccw_device_register(struct ccw_device
*cdev
)
678 struct device
*dev
= &cdev
->dev
;
681 dev
->bus
= &ccw_bus_type
;
682 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
683 cdev
->private->dev_id
.devno
);
686 return device_add(dev
);
689 static int match_dev_id(struct device
*dev
, void *data
)
691 struct ccw_device
*cdev
= to_ccwdev(dev
);
692 struct ccw_dev_id
*dev_id
= data
;
694 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
698 * get_ccwdev_by_dev_id() - obtain device from a ccw device id
699 * @dev_id: id of the device to be searched
701 * This function searches all devices attached to the ccw bus for a device
704 * If a device is found its reference count is increased and returned;
705 * else %NULL is returned.
707 struct ccw_device
*get_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
)
711 dev
= bus_find_device(&ccw_bus_type
, NULL
, dev_id
, match_dev_id
);
713 return dev
? to_ccwdev(dev
) : NULL
;
715 EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id
);
717 static void ccw_device_do_unbind_bind(struct ccw_device
*cdev
)
721 if (device_is_registered(&cdev
->dev
)) {
722 device_release_driver(&cdev
->dev
);
723 ret
= device_attach(&cdev
->dev
);
724 WARN_ON(ret
== -ENODEV
);
729 ccw_device_release(struct device
*dev
)
731 struct ccw_device
*cdev
;
733 cdev
= to_ccwdev(dev
);
734 /* Release reference of parent subchannel. */
735 put_device(cdev
->dev
.parent
);
736 kfree(cdev
->private);
740 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
742 struct ccw_device
*cdev
;
744 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
746 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
747 GFP_KERNEL
| GFP_DMA
);
752 return ERR_PTR(-ENOMEM
);
755 static void ccw_device_todo(struct work_struct
*work
);
757 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
758 struct ccw_device
*cdev
)
760 cdev
->private->cdev
= cdev
;
761 cdev
->private->int_class
= IRQIO_CIO
;
762 atomic_set(&cdev
->private->onoff
, 0);
763 cdev
->dev
.parent
= &sch
->dev
;
764 cdev
->dev
.release
= ccw_device_release
;
765 INIT_WORK(&cdev
->private->todo_work
, ccw_device_todo
);
766 cdev
->dev
.groups
= ccwdev_attr_groups
;
767 /* Do first half of device_register. */
768 device_initialize(&cdev
->dev
);
769 if (!get_device(&sch
->dev
)) {
770 /* Release reference from device_initialize(). */
771 put_device(&cdev
->dev
);
774 cdev
->private->flags
.initialized
= 1;
778 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
780 struct ccw_device
*cdev
;
783 cdev
= io_subchannel_allocate_dev(sch
);
785 ret
= io_subchannel_initialize_dev(sch
, cdev
);
792 static void io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
794 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
796 struct ccw_device
*cdev
;
798 /* Need to allocate a new ccw device. */
799 cdev
= io_subchannel_create_ccwdev(sch
);
801 /* OK, we did everything we could... */
802 css_sch_device_unregister(sch
);
805 /* Start recognition for the new ccw device. */
806 io_subchannel_recog(cdev
, sch
);
810 * Register recognized device.
812 static void io_subchannel_register(struct ccw_device
*cdev
)
814 struct subchannel
*sch
;
815 int ret
, adjust_init_count
= 1;
818 sch
= to_subchannel(cdev
->dev
.parent
);
820 * Check if subchannel is still registered. It may have become
821 * unregistered if a machine check hit us after finishing
822 * device recognition but before the register work could be
825 if (!device_is_registered(&sch
->dev
))
827 css_update_ssd_info(sch
);
829 * io_subchannel_register() will also be called after device
830 * recognition has been done for a boxed device (which will already
831 * be registered). We need to reprobe since we may now have sense id
834 if (device_is_registered(&cdev
->dev
)) {
836 ret
= device_reprobe(&cdev
->dev
);
838 /* We can't do much here. */
839 CIO_MSG_EVENT(0, "device_reprobe() returned"
840 " %d for 0.%x.%04x\n", ret
,
841 cdev
->private->dev_id
.ssid
,
842 cdev
->private->dev_id
.devno
);
844 adjust_init_count
= 0;
848 * Now we know this subchannel will stay, we can throw
849 * our delayed uevent.
851 dev_set_uevent_suppress(&sch
->dev
, 0);
852 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
853 /* make it known to the system */
854 ret
= ccw_device_register(cdev
);
856 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
857 cdev
->private->dev_id
.ssid
,
858 cdev
->private->dev_id
.devno
, ret
);
859 spin_lock_irqsave(sch
->lock
, flags
);
860 sch_set_cdev(sch
, NULL
);
861 spin_unlock_irqrestore(sch
->lock
, flags
);
862 /* Release initial device reference. */
863 put_device(&cdev
->dev
);
867 cdev
->private->flags
.recog_done
= 1;
868 wake_up(&cdev
->private->wait_q
);
870 if (adjust_init_count
&& atomic_dec_and_test(&ccw_device_init_count
))
871 wake_up(&ccw_device_init_wq
);
874 static void ccw_device_call_sch_unregister(struct ccw_device
*cdev
)
876 struct subchannel
*sch
;
878 /* Get subchannel reference for local processing. */
879 if (!get_device(cdev
->dev
.parent
))
881 sch
= to_subchannel(cdev
->dev
.parent
);
882 css_sch_device_unregister(sch
);
883 /* Release subchannel reference for local processing. */
884 put_device(&sch
->dev
);
888 * subchannel recognition done. Called from the state machine.
891 io_subchannel_recog_done(struct ccw_device
*cdev
)
893 if (css_init_done
== 0) {
894 cdev
->private->flags
.recog_done
= 1;
897 switch (cdev
->private->state
) {
898 case DEV_STATE_BOXED
:
899 /* Device did not respond in time. */
900 case DEV_STATE_NOT_OPER
:
901 cdev
->private->flags
.recog_done
= 1;
902 /* Remove device found not operational. */
903 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
904 if (atomic_dec_and_test(&ccw_device_init_count
))
905 wake_up(&ccw_device_init_wq
);
907 case DEV_STATE_OFFLINE
:
909 * We can't register the device in interrupt context so
910 * we schedule a work item.
912 ccw_device_sched_todo(cdev
, CDEV_TODO_REGISTER
);
917 static void io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
919 struct ccw_device_private
*priv
;
921 cdev
->ccwlock
= sch
->lock
;
923 /* Init private data. */
924 priv
= cdev
->private;
925 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
926 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
927 priv
->schid
= sch
->schid
;
928 priv
->state
= DEV_STATE_NOT_OPER
;
929 INIT_LIST_HEAD(&priv
->cmb_list
);
930 init_waitqueue_head(&priv
->wait_q
);
931 init_timer(&priv
->timer
);
933 /* Increase counter of devices currently in recognition. */
934 atomic_inc(&ccw_device_init_count
);
936 /* Start async. device sensing. */
937 spin_lock_irq(sch
->lock
);
938 sch_set_cdev(sch
, cdev
);
939 ccw_device_recognition(cdev
);
940 spin_unlock_irq(sch
->lock
);
943 static int ccw_device_move_to_sch(struct ccw_device
*cdev
,
944 struct subchannel
*sch
)
946 struct subchannel
*old_sch
;
947 int rc
, old_enabled
= 0;
949 old_sch
= to_subchannel(cdev
->dev
.parent
);
950 /* Obtain child reference for new parent. */
951 if (!get_device(&sch
->dev
))
954 if (!sch_is_pseudo_sch(old_sch
)) {
955 spin_lock_irq(old_sch
->lock
);
956 old_enabled
= old_sch
->schib
.pmcw
.ena
;
959 rc
= cio_disable_subchannel(old_sch
);
960 spin_unlock_irq(old_sch
->lock
);
962 /* Release child reference for new parent. */
963 put_device(&sch
->dev
);
968 mutex_lock(&sch
->reg_mutex
);
969 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
970 mutex_unlock(&sch
->reg_mutex
);
972 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
973 cdev
->private->dev_id
.ssid
,
974 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
975 sch
->schib
.pmcw
.dev
, rc
);
977 /* Try to reenable the old subchannel. */
978 spin_lock_irq(old_sch
->lock
);
979 cio_enable_subchannel(old_sch
, (u32
)(addr_t
)old_sch
);
980 spin_unlock_irq(old_sch
->lock
);
982 /* Release child reference for new parent. */
983 put_device(&sch
->dev
);
986 /* Clean up old subchannel. */
987 if (!sch_is_pseudo_sch(old_sch
)) {
988 spin_lock_irq(old_sch
->lock
);
989 sch_set_cdev(old_sch
, NULL
);
990 spin_unlock_irq(old_sch
->lock
);
991 css_schedule_eval(old_sch
->schid
);
993 /* Release child reference for old parent. */
994 put_device(&old_sch
->dev
);
995 /* Initialize new subchannel. */
996 spin_lock_irq(sch
->lock
);
997 cdev
->private->schid
= sch
->schid
;
998 cdev
->ccwlock
= sch
->lock
;
999 if (!sch_is_pseudo_sch(sch
))
1000 sch_set_cdev(sch
, cdev
);
1001 spin_unlock_irq(sch
->lock
);
1002 if (!sch_is_pseudo_sch(sch
))
1003 css_update_ssd_info(sch
);
1007 static int ccw_device_move_to_orph(struct ccw_device
*cdev
)
1009 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1010 struct channel_subsystem
*css
= to_css(sch
->dev
.parent
);
1012 return ccw_device_move_to_sch(cdev
, css
->pseudo_subchannel
);
1015 static void io_subchannel_irq(struct subchannel
*sch
)
1017 struct ccw_device
*cdev
;
1019 cdev
= sch_get_cdev(sch
);
1021 CIO_TRACE_EVENT(6, "IRQ");
1022 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
1024 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1026 inc_irq_stat(IRQIO_CIO
);
1029 void io_subchannel_init_config(struct subchannel
*sch
)
1031 memset(&sch
->config
, 0, sizeof(sch
->config
));
1032 sch
->config
.csense
= 1;
1035 static void io_subchannel_init_fields(struct subchannel
*sch
)
1037 if (cio_is_console(sch
->schid
))
1040 sch
->opm
= chp_get_sch_opm(sch
);
1041 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1042 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1044 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1045 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1046 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1047 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1048 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1050 io_subchannel_init_config(sch
);
1054 * Note: We always return 0 so that we bind to the device even on error.
1055 * This is needed so that our remove function is called on unregister.
1057 static int io_subchannel_probe(struct subchannel
*sch
)
1059 struct io_subchannel_private
*io_priv
;
1060 struct ccw_device
*cdev
;
1063 if (cio_is_console(sch
->schid
)) {
1064 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1065 &io_subchannel_attr_group
);
1067 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1068 "attributes for subchannel "
1069 "0.%x.%04x (rc=%d)\n",
1070 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1072 * The console subchannel already has an associated ccw_device.
1073 * Throw the delayed uevent for the subchannel, register
1074 * the ccw_device and exit.
1076 dev_set_uevent_suppress(&sch
->dev
, 0);
1077 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1078 cdev
= sch_get_cdev(sch
);
1079 cdev
->dev
.groups
= ccwdev_attr_groups
;
1080 device_initialize(&cdev
->dev
);
1081 cdev
->private->flags
.initialized
= 1;
1082 ccw_device_register(cdev
);
1084 * Check if the device is already online. If it is
1085 * the reference count needs to be corrected since we
1086 * didn't obtain a reference in ccw_device_set_online.
1088 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1089 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1090 cdev
->private->state
!= DEV_STATE_BOXED
)
1091 get_device(&cdev
->dev
);
1094 io_subchannel_init_fields(sch
);
1095 rc
= cio_commit_config(sch
);
1098 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1099 &io_subchannel_attr_group
);
1102 /* Allocate I/O subchannel private data. */
1103 io_priv
= kzalloc(sizeof(*io_priv
), GFP_KERNEL
| GFP_DMA
);
1107 set_io_private(sch
, io_priv
);
1108 css_schedule_eval(sch
->schid
);
1112 spin_lock_irq(sch
->lock
);
1113 css_sched_sch_todo(sch
, SCH_TODO_UNREG
);
1114 spin_unlock_irq(sch
->lock
);
1119 io_subchannel_remove (struct subchannel
*sch
)
1121 struct io_subchannel_private
*io_priv
= to_io_private(sch
);
1122 struct ccw_device
*cdev
;
1124 cdev
= sch_get_cdev(sch
);
1127 io_subchannel_quiesce(sch
);
1128 /* Set ccw device to not operational and drop reference. */
1129 spin_lock_irq(cdev
->ccwlock
);
1130 sch_set_cdev(sch
, NULL
);
1131 set_io_private(sch
, NULL
);
1132 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1133 spin_unlock_irq(cdev
->ccwlock
);
1134 ccw_device_unregister(cdev
);
1137 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1141 static void io_subchannel_verify(struct subchannel
*sch
)
1143 struct ccw_device
*cdev
;
1145 cdev
= sch_get_cdev(sch
);
1147 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1150 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1152 struct ccw_device
*cdev
;
1154 cdev
= sch_get_cdev(sch
);
1157 if (cio_update_schib(sch
))
1159 /* Check for I/O on path. */
1160 if (scsw_actl(&sch
->schib
.scsw
) == 0 || sch
->schib
.pmcw
.lpum
!= mask
)
1162 if (cdev
->private->state
== DEV_STATE_ONLINE
) {
1163 ccw_device_kill_io(cdev
);
1169 /* Trigger path verification. */
1170 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1174 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1177 static int io_subchannel_chp_event(struct subchannel
*sch
,
1178 struct chp_link
*link
, int event
)
1180 struct ccw_device
*cdev
= sch_get_cdev(sch
);
1183 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1191 cdev
->private->path_gone_mask
|= mask
;
1192 io_subchannel_terminate_path(sch
, mask
);
1198 cdev
->private->path_new_mask
|= mask
;
1199 io_subchannel_verify(sch
);
1202 if (cio_update_schib(sch
))
1205 cdev
->private->path_gone_mask
|= mask
;
1206 io_subchannel_terminate_path(sch
, mask
);
1209 if (cio_update_schib(sch
))
1211 sch
->lpm
|= mask
& sch
->opm
;
1213 cdev
->private->path_new_mask
|= mask
;
1214 io_subchannel_verify(sch
);
1220 static void io_subchannel_quiesce(struct subchannel
*sch
)
1222 struct ccw_device
*cdev
;
1225 spin_lock_irq(sch
->lock
);
1226 cdev
= sch_get_cdev(sch
);
1227 if (cio_is_console(sch
->schid
))
1229 if (!sch
->schib
.pmcw
.ena
)
1231 ret
= cio_disable_subchannel(sch
);
1235 cdev
->handler(cdev
, cdev
->private->intparm
, ERR_PTR(-EIO
));
1236 while (ret
== -EBUSY
) {
1237 cdev
->private->state
= DEV_STATE_QUIESCE
;
1238 cdev
->private->iretry
= 255;
1239 ret
= ccw_device_cancel_halt_clear(cdev
);
1240 if (ret
== -EBUSY
) {
1241 ccw_device_set_timeout(cdev
, HZ
/10);
1242 spin_unlock_irq(sch
->lock
);
1243 wait_event(cdev
->private->wait_q
,
1244 cdev
->private->state
!= DEV_STATE_QUIESCE
);
1245 spin_lock_irq(sch
->lock
);
1247 ret
= cio_disable_subchannel(sch
);
1250 spin_unlock_irq(sch
->lock
);
1253 static void io_subchannel_shutdown(struct subchannel
*sch
)
1255 io_subchannel_quiesce(sch
);
1258 static int device_is_disconnected(struct ccw_device
*cdev
)
1262 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1263 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1266 static int recovery_check(struct device
*dev
, void *data
)
1268 struct ccw_device
*cdev
= to_ccwdev(dev
);
1271 spin_lock_irq(cdev
->ccwlock
);
1272 switch (cdev
->private->state
) {
1273 case DEV_STATE_DISCONNECTED
:
1274 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1275 cdev
->private->dev_id
.ssid
,
1276 cdev
->private->dev_id
.devno
);
1277 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1280 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1284 spin_unlock_irq(cdev
->ccwlock
);
1289 static void recovery_work_func(struct work_struct
*unused
)
1293 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1295 spin_lock_irq(&recovery_lock
);
1296 if (!timer_pending(&recovery_timer
)) {
1297 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1299 mod_timer(&recovery_timer
, jiffies
+
1300 recovery_delay
[recovery_phase
] * HZ
);
1302 spin_unlock_irq(&recovery_lock
);
1304 CIO_MSG_EVENT(4, "recovery: end\n");
1307 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1309 static void recovery_func(unsigned long data
)
1312 * We can't do our recovery in softirq context and it's not
1313 * performance critical, so we schedule it.
1315 schedule_work(&recovery_work
);
1318 static void ccw_device_schedule_recovery(void)
1320 unsigned long flags
;
1322 CIO_MSG_EVENT(4, "recovery: schedule\n");
1323 spin_lock_irqsave(&recovery_lock
, flags
);
1324 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1326 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1328 spin_unlock_irqrestore(&recovery_lock
, flags
);
1331 static int purge_fn(struct device
*dev
, void *data
)
1333 struct ccw_device
*cdev
= to_ccwdev(dev
);
1334 struct ccw_dev_id
*id
= &cdev
->private->dev_id
;
1336 spin_lock_irq(cdev
->ccwlock
);
1337 if (is_blacklisted(id
->ssid
, id
->devno
) &&
1338 (cdev
->private->state
== DEV_STATE_OFFLINE
) &&
1339 (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) == 0)) {
1340 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id
->ssid
,
1342 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1343 atomic_set(&cdev
->private->onoff
, 0);
1345 spin_unlock_irq(cdev
->ccwlock
);
1346 /* Abort loop in case of pending signal. */
1347 if (signal_pending(current
))
1354 * ccw_purge_blacklisted - purge unused, blacklisted devices
1356 * Unregister all ccw devices that are offline and on the blacklist.
1358 int ccw_purge_blacklisted(void)
1360 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1361 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1365 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1369 ccw_device_set_timeout(cdev
, 0);
1370 cdev
->private->flags
.fake_irb
= 0;
1371 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1373 ccw_device_schedule_recovery();
1376 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1378 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1380 CIO_TRACE_EVENT(2, "notoper");
1381 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1382 ccw_device_set_timeout(cdev
, 0);
1383 cio_disable_subchannel(sch
);
1384 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1387 enum io_sch_action
{
1391 IO_SCH_UNREG_ATTACH
,
1399 static enum io_sch_action
sch_get_action(struct subchannel
*sch
)
1401 struct ccw_device
*cdev
;
1403 cdev
= sch_get_cdev(sch
);
1404 if (cio_update_schib(sch
)) {
1405 /* Not operational. */
1407 return IO_SCH_UNREG
;
1408 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1409 return IO_SCH_UNREG
;
1410 return IO_SCH_ORPH_UNREG
;
1414 return IO_SCH_ATTACH
;
1415 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1416 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1417 return IO_SCH_UNREG_ATTACH
;
1418 return IO_SCH_ORPH_ATTACH
;
1420 if ((sch
->schib
.pmcw
.pam
& sch
->opm
) == 0) {
1421 if (ccw_device_notify(cdev
, CIO_NO_PATH
) != NOTIFY_OK
)
1422 return IO_SCH_UNREG
;
1425 if (device_is_disconnected(cdev
))
1426 return IO_SCH_REPROBE
;
1427 if (cdev
->online
&& !cdev
->private->flags
.resuming
)
1428 return IO_SCH_VERIFY
;
1429 if (cdev
->private->state
== DEV_STATE_NOT_OPER
)
1430 return IO_SCH_UNREG_ATTACH
;
1435 * io_subchannel_sch_event - process subchannel event
1437 * @process: non-zero if function is called in process context
1439 * An unspecified event occurred for this subchannel. Adjust data according
1440 * to the current operational state of the subchannel and device. Return
1441 * zero when the event has been handled sufficiently or -EAGAIN when this
1442 * function should be called again in process context.
1444 static int io_subchannel_sch_event(struct subchannel
*sch
, int process
)
1446 unsigned long flags
;
1447 struct ccw_device
*cdev
;
1448 struct ccw_dev_id dev_id
;
1449 enum io_sch_action action
;
1452 spin_lock_irqsave(sch
->lock
, flags
);
1453 if (!device_is_registered(&sch
->dev
))
1455 if (work_pending(&sch
->todo_work
))
1457 cdev
= sch_get_cdev(sch
);
1458 if (cdev
&& work_pending(&cdev
->private->todo_work
))
1460 action
= sch_get_action(sch
);
1461 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1462 sch
->schid
.ssid
, sch
->schid
.sch_no
, process
,
1464 /* Perform immediate actions while holding the lock. */
1466 case IO_SCH_REPROBE
:
1467 /* Trigger device recognition. */
1468 ccw_device_trigger_reprobe(cdev
);
1472 /* Trigger path verification. */
1473 io_subchannel_verify(sch
);
1477 ccw_device_set_disconnected(cdev
);
1480 case IO_SCH_ORPH_UNREG
:
1481 case IO_SCH_ORPH_ATTACH
:
1482 ccw_device_set_disconnected(cdev
);
1484 case IO_SCH_UNREG_ATTACH
:
1488 if (cdev
->private->state
== DEV_STATE_SENSE_ID
) {
1490 * Note: delayed work triggered by this event
1491 * and repeated calls to sch_event are synchronized
1492 * by the above check for work_pending(cdev).
1494 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1496 ccw_device_set_notoper(cdev
);
1504 spin_unlock_irqrestore(sch
->lock
, flags
);
1505 /* All other actions require process context. */
1508 /* Handle attached ccw device. */
1510 case IO_SCH_ORPH_UNREG
:
1511 case IO_SCH_ORPH_ATTACH
:
1512 /* Move ccw device to orphanage. */
1513 rc
= ccw_device_move_to_orph(cdev
);
1517 case IO_SCH_UNREG_ATTACH
:
1518 spin_lock_irqsave(sch
->lock
, flags
);
1519 if (cdev
->private->flags
.resuming
) {
1520 /* Device will be handled later. */
1524 sch_set_cdev(sch
, NULL
);
1525 spin_unlock_irqrestore(sch
->lock
, flags
);
1526 /* Unregister ccw device. */
1527 ccw_device_unregister(cdev
);
1532 /* Handle subchannel. */
1534 case IO_SCH_ORPH_UNREG
:
1536 if (!cdev
|| !cdev
->private->flags
.resuming
)
1537 css_sch_device_unregister(sch
);
1539 case IO_SCH_ORPH_ATTACH
:
1540 case IO_SCH_UNREG_ATTACH
:
1542 dev_id
.ssid
= sch
->schid
.ssid
;
1543 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1544 cdev
= get_ccwdev_by_dev_id(&dev_id
);
1546 sch_create_and_recog_new_device(sch
);
1549 rc
= ccw_device_move_to_sch(cdev
, sch
);
1551 /* Release reference from get_ccwdev_by_dev_id() */
1552 put_device(&cdev
->dev
);
1555 spin_lock_irqsave(sch
->lock
, flags
);
1556 ccw_device_trigger_reprobe(cdev
);
1557 spin_unlock_irqrestore(sch
->lock
, flags
);
1558 /* Release reference from get_ccwdev_by_dev_id() */
1559 put_device(&cdev
->dev
);
1567 spin_unlock_irqrestore(sch
->lock
, flags
);
1572 #ifdef CONFIG_CCW_CONSOLE
1573 static struct ccw_device console_cdev
;
1574 static struct ccw_device_private console_private
;
1575 static int console_cdev_in_use
;
1577 static DEFINE_SPINLOCK(ccw_console_lock
);
1579 spinlock_t
* cio_get_console_lock(void)
1581 return &ccw_console_lock
;
1584 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1585 struct subchannel
*sch
)
1587 struct io_subchannel_private
*io_priv
= cio_get_console_priv();
1590 /* Attach subchannel private data. */
1591 memset(io_priv
, 0, sizeof(*io_priv
));
1592 set_io_private(sch
, io_priv
);
1593 io_subchannel_init_fields(sch
);
1594 rc
= cio_commit_config(sch
);
1597 sch
->driver
= &io_subchannel_driver
;
1598 /* Initialize the ccw_device structure. */
1599 cdev
->dev
.parent
= &sch
->dev
;
1600 sch_set_cdev(sch
, cdev
);
1601 io_subchannel_recog(cdev
, sch
);
1602 /* Now wait for the async. recognition to come to an end. */
1603 spin_lock_irq(cdev
->ccwlock
);
1604 while (!dev_fsm_final_state(cdev
))
1607 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1609 ccw_device_online(cdev
);
1610 while (!dev_fsm_final_state(cdev
))
1612 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1616 spin_unlock_irq(cdev
->ccwlock
);
1621 ccw_device_probe_console(void)
1623 struct subchannel
*sch
;
1626 if (xchg(&console_cdev_in_use
, 1) != 0)
1627 return ERR_PTR(-EBUSY
);
1628 sch
= cio_probe_console();
1630 console_cdev_in_use
= 0;
1631 return (void *) sch
;
1633 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1634 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1635 console_cdev
.private = &console_private
;
1636 console_private
.cdev
= &console_cdev
;
1637 console_private
.int_class
= IRQIO_CIO
;
1638 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1640 cio_release_console();
1641 console_cdev_in_use
= 0;
1642 return ERR_PTR(ret
);
1644 console_cdev
.online
= 1;
1645 return &console_cdev
;
1648 static int ccw_device_pm_restore(struct device
*dev
);
1650 int ccw_device_force_console(void)
1652 if (!console_cdev_in_use
)
1654 return ccw_device_pm_restore(&console_cdev
.dev
);
1656 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1660 * get ccw_device matching the busid, but only if owned by cdrv
1663 __ccwdev_check_busid(struct device
*dev
, void *id
)
1669 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1674 * get_ccwdev_by_busid() - obtain device from a bus id
1675 * @cdrv: driver the device is owned by
1676 * @bus_id: bus id of the device to be searched
1678 * This function searches all devices owned by @cdrv for a device with a bus
1679 * id matching @bus_id.
1681 * If a match is found, its reference count of the found device is increased
1682 * and it is returned; else %NULL is returned.
1684 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1689 dev
= driver_find_device(&cdrv
->driver
, NULL
, (void *)bus_id
,
1690 __ccwdev_check_busid
);
1692 return dev
? to_ccwdev(dev
) : NULL
;
1695 /************************** device driver handling ************************/
1697 /* This is the implementation of the ccw_driver class. The probe, remove
1698 * and release methods are initially very similar to the device_driver
1699 * implementations, with the difference that they have ccw_device
1702 * A ccw driver also contains the information that is needed for
1706 ccw_device_probe (struct device
*dev
)
1708 struct ccw_device
*cdev
= to_ccwdev(dev
);
1709 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1712 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1713 /* Note: we interpret class 0 in this context as an uninitialized
1714 * field since it translates to a non-I/O interrupt class. */
1715 if (cdrv
->int_class
!= 0)
1716 cdev
->private->int_class
= cdrv
->int_class
;
1718 cdev
->private->int_class
= IRQIO_CIO
;
1720 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1724 cdev
->private->int_class
= IRQIO_CIO
;
1732 ccw_device_remove (struct device
*dev
)
1734 struct ccw_device
*cdev
= to_ccwdev(dev
);
1735 struct ccw_driver
*cdrv
= cdev
->drv
;
1742 spin_lock_irq(cdev
->ccwlock
);
1743 ret
= ccw_device_offline(cdev
);
1744 spin_unlock_irq(cdev
->ccwlock
);
1746 wait_event(cdev
->private->wait_q
,
1747 dev_fsm_final_state(cdev
));
1749 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1750 "device 0.%x.%04x\n",
1751 ret
, cdev
->private->dev_id
.ssid
,
1752 cdev
->private->dev_id
.devno
);
1753 /* Give up reference obtained in ccw_device_set_online(). */
1754 put_device(&cdev
->dev
);
1756 ccw_device_set_timeout(cdev
, 0);
1758 cdev
->private->int_class
= IRQIO_CIO
;
1762 static void ccw_device_shutdown(struct device
*dev
)
1764 struct ccw_device
*cdev
;
1766 cdev
= to_ccwdev(dev
);
1767 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1768 cdev
->drv
->shutdown(cdev
);
1772 static int ccw_device_pm_prepare(struct device
*dev
)
1774 struct ccw_device
*cdev
= to_ccwdev(dev
);
1776 if (work_pending(&cdev
->private->todo_work
))
1778 /* Fail while device is being set online/offline. */
1779 if (atomic_read(&cdev
->private->onoff
))
1782 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1783 return cdev
->drv
->prepare(cdev
);
1788 static void ccw_device_pm_complete(struct device
*dev
)
1790 struct ccw_device
*cdev
= to_ccwdev(dev
);
1792 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1793 cdev
->drv
->complete(cdev
);
1796 static int ccw_device_pm_freeze(struct device
*dev
)
1798 struct ccw_device
*cdev
= to_ccwdev(dev
);
1799 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1800 int ret
, cm_enabled
;
1802 /* Fail suspend while device is in transistional state. */
1803 if (!dev_fsm_final_state(cdev
))
1807 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1808 ret
= cdev
->drv
->freeze(cdev
);
1813 spin_lock_irq(sch
->lock
);
1814 cm_enabled
= cdev
->private->cmb
!= NULL
;
1815 spin_unlock_irq(sch
->lock
);
1817 /* Don't have the css write on memory. */
1818 ret
= ccw_set_cmf(cdev
, 0);
1822 /* From here on, disallow device driver I/O. */
1823 spin_lock_irq(sch
->lock
);
1824 ret
= cio_disable_subchannel(sch
);
1825 spin_unlock_irq(sch
->lock
);
1830 static int ccw_device_pm_thaw(struct device
*dev
)
1832 struct ccw_device
*cdev
= to_ccwdev(dev
);
1833 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1834 int ret
, cm_enabled
;
1839 spin_lock_irq(sch
->lock
);
1840 /* Allow device driver I/O again. */
1841 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1842 cm_enabled
= cdev
->private->cmb
!= NULL
;
1843 spin_unlock_irq(sch
->lock
);
1848 ret
= ccw_set_cmf(cdev
, 1);
1853 if (cdev
->drv
&& cdev
->drv
->thaw
)
1854 ret
= cdev
->drv
->thaw(cdev
);
1859 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
1861 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1863 spin_lock_irq(sch
->lock
);
1864 if (cio_is_console(sch
->schid
)) {
1865 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1869 * While we were sleeping, devices may have gone or become
1870 * available again. Kick re-detection.
1872 cdev
->private->flags
.resuming
= 1;
1873 cdev
->private->path_new_mask
= LPM_ANYPATH
;
1874 css_sched_sch_todo(sch
, SCH_TODO_EVAL
);
1875 spin_unlock_irq(sch
->lock
);
1876 css_wait_for_slow_path();
1878 /* cdev may have been moved to a different subchannel. */
1879 sch
= to_subchannel(cdev
->dev
.parent
);
1880 spin_lock_irq(sch
->lock
);
1881 if (cdev
->private->state
!= DEV_STATE_ONLINE
&&
1882 cdev
->private->state
!= DEV_STATE_OFFLINE
)
1885 ccw_device_recognition(cdev
);
1886 spin_unlock_irq(sch
->lock
);
1887 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
1888 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
1889 spin_lock_irq(sch
->lock
);
1892 cdev
->private->flags
.resuming
= 0;
1893 spin_unlock_irq(sch
->lock
);
1896 static int resume_handle_boxed(struct ccw_device
*cdev
)
1898 cdev
->private->state
= DEV_STATE_BOXED
;
1899 if (ccw_device_notify(cdev
, CIO_BOXED
) == NOTIFY_OK
)
1901 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1905 static int resume_handle_disc(struct ccw_device
*cdev
)
1907 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1908 if (ccw_device_notify(cdev
, CIO_GONE
) == NOTIFY_OK
)
1910 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1914 static int ccw_device_pm_restore(struct device
*dev
)
1916 struct ccw_device
*cdev
= to_ccwdev(dev
);
1917 struct subchannel
*sch
;
1920 __ccw_device_pm_restore(cdev
);
1921 sch
= to_subchannel(cdev
->dev
.parent
);
1922 spin_lock_irq(sch
->lock
);
1923 if (cio_is_console(sch
->schid
))
1926 /* check recognition results */
1927 switch (cdev
->private->state
) {
1928 case DEV_STATE_OFFLINE
:
1929 case DEV_STATE_ONLINE
:
1930 cdev
->private->flags
.donotify
= 0;
1932 case DEV_STATE_BOXED
:
1933 ret
= resume_handle_boxed(cdev
);
1938 ret
= resume_handle_disc(cdev
);
1943 /* check if the device type has changed */
1944 if (!ccw_device_test_sense_data(cdev
)) {
1945 ccw_device_update_sense_data(cdev
);
1946 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
1953 if (ccw_device_online(cdev
)) {
1954 ret
= resume_handle_disc(cdev
);
1959 spin_unlock_irq(sch
->lock
);
1960 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1961 spin_lock_irq(sch
->lock
);
1963 if (ccw_device_notify(cdev
, CIO_OPER
) == NOTIFY_BAD
) {
1964 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1969 /* reenable cmf, if needed */
1970 if (cdev
->private->cmb
) {
1971 spin_unlock_irq(sch
->lock
);
1972 ret
= ccw_set_cmf(cdev
, 1);
1973 spin_lock_irq(sch
->lock
);
1975 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1976 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
1977 cdev
->private->dev_id
.devno
, ret
);
1983 spin_unlock_irq(sch
->lock
);
1984 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
1985 ret
= cdev
->drv
->restore(cdev
);
1989 spin_unlock_irq(sch
->lock
);
1993 static const struct dev_pm_ops ccw_pm_ops
= {
1994 .prepare
= ccw_device_pm_prepare
,
1995 .complete
= ccw_device_pm_complete
,
1996 .freeze
= ccw_device_pm_freeze
,
1997 .thaw
= ccw_device_pm_thaw
,
1998 .restore
= ccw_device_pm_restore
,
2001 static struct bus_type ccw_bus_type
= {
2003 .match
= ccw_bus_match
,
2004 .uevent
= ccw_uevent
,
2005 .probe
= ccw_device_probe
,
2006 .remove
= ccw_device_remove
,
2007 .shutdown
= ccw_device_shutdown
,
2012 * ccw_driver_register() - register a ccw driver
2013 * @cdriver: driver to be registered
2015 * This function is mainly a wrapper around driver_register().
2017 * %0 on success and a negative error value on failure.
2019 int ccw_driver_register(struct ccw_driver
*cdriver
)
2021 struct device_driver
*drv
= &cdriver
->driver
;
2023 drv
->bus
= &ccw_bus_type
;
2025 return driver_register(drv
);
2029 * ccw_driver_unregister() - deregister a ccw driver
2030 * @cdriver: driver to be deregistered
2032 * This function is mainly a wrapper around driver_unregister().
2034 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
2036 driver_unregister(&cdriver
->driver
);
2039 static void ccw_device_todo(struct work_struct
*work
)
2041 struct ccw_device_private
*priv
;
2042 struct ccw_device
*cdev
;
2043 struct subchannel
*sch
;
2044 enum cdev_todo todo
;
2046 priv
= container_of(work
, struct ccw_device_private
, todo_work
);
2048 sch
= to_subchannel(cdev
->dev
.parent
);
2049 /* Find out todo. */
2050 spin_lock_irq(cdev
->ccwlock
);
2052 priv
->todo
= CDEV_TODO_NOTHING
;
2053 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
2054 priv
->dev_id
.ssid
, priv
->dev_id
.devno
, todo
);
2055 spin_unlock_irq(cdev
->ccwlock
);
2058 case CDEV_TODO_ENABLE_CMF
:
2061 case CDEV_TODO_REBIND
:
2062 ccw_device_do_unbind_bind(cdev
);
2064 case CDEV_TODO_REGISTER
:
2065 io_subchannel_register(cdev
);
2067 case CDEV_TODO_UNREG_EVAL
:
2068 if (!sch_is_pseudo_sch(sch
))
2069 css_schedule_eval(sch
->schid
);
2071 case CDEV_TODO_UNREG
:
2072 if (sch_is_pseudo_sch(sch
))
2073 ccw_device_unregister(cdev
);
2075 ccw_device_call_sch_unregister(cdev
);
2080 /* Release workqueue ref. */
2081 put_device(&cdev
->dev
);
2085 * ccw_device_sched_todo - schedule ccw device operation
2089 * Schedule the operation identified by @todo to be performed on the slow path
2090 * workqueue. Do nothing if another operation with higher priority is already
2091 * scheduled. Needs to be called with ccwdev lock held.
2093 void ccw_device_sched_todo(struct ccw_device
*cdev
, enum cdev_todo todo
)
2095 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2096 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
2098 if (cdev
->private->todo
>= todo
)
2100 cdev
->private->todo
= todo
;
2101 /* Get workqueue ref. */
2102 if (!get_device(&cdev
->dev
))
2104 if (!queue_work(cio_work_q
, &cdev
->private->todo_work
)) {
2105 /* Already queued, release workqueue ref. */
2106 put_device(&cdev
->dev
);
2111 * ccw_device_siosl() - initiate logging
2114 * This function is used to invoke model-dependent logging within the channel
2117 int ccw_device_siosl(struct ccw_device
*cdev
)
2119 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2121 return chsc_siosl(sch
->schid
);
2123 EXPORT_SYMBOL_GPL(ccw_device_siosl
);
2125 MODULE_LICENSE("GPL");
2126 EXPORT_SYMBOL(ccw_device_set_online
);
2127 EXPORT_SYMBOL(ccw_device_set_offline
);
2128 EXPORT_SYMBOL(ccw_driver_register
);
2129 EXPORT_SYMBOL(ccw_driver_unregister
);
2130 EXPORT_SYMBOL(get_ccwdev_by_busid
);