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/delay.h>
23 #include <linux/timer.h>
24 #include <linux/kernel_stat.h>
26 #include <asm/ccwdev.h>
28 #include <asm/param.h> /* HZ */
34 #include "cio_debug.h"
39 #include "blacklist.h"
42 static struct timer_list recovery_timer
;
43 static DEFINE_SPINLOCK(recovery_lock
);
44 static int recovery_phase
;
45 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
47 static atomic_t ccw_device_init_count
= ATOMIC_INIT(0);
48 static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq
);
49 static struct bus_type ccw_bus_type
;
51 /******************* bus type handling ***********************/
53 /* The Linux driver model distinguishes between a bus type and
54 * the bus itself. Of course we only have one channel
55 * subsystem driver and one channel system per machine, but
56 * we still use the abstraction. T.R. says it's a good idea. */
58 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
60 struct ccw_device
*cdev
= to_ccwdev(dev
);
61 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
62 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
67 found
= ccw_device_id_match(ids
, &cdev
->id
);
71 cdev
->id
.driver_info
= found
->driver_info
;
76 /* Store modalias string delimited by prefix/suffix string into buffer with
77 * specified size. Return length of resulting string (excluding trailing '\0')
78 * even if string doesn't fit buffer (snprintf semantics). */
79 static int snprint_alias(char *buf
, size_t size
,
80 struct ccw_device_id
*id
, const char *suffix
)
84 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
90 if (id
->dev_type
!= 0)
91 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
92 id
->dev_model
, suffix
);
94 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
99 /* Set up environment variables for ccw device uevent. Return 0 on success,
100 * non-zero otherwise. */
101 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
103 struct ccw_device
*cdev
= to_ccwdev(dev
);
104 struct ccw_device_id
*id
= &(cdev
->id
);
106 char modalias_buf
[30];
109 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
114 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
118 /* The next two can be zero, that's ok for us */
120 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
125 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
130 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
131 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
135 static void io_subchannel_irq(struct subchannel
*);
136 static int io_subchannel_probe(struct subchannel
*);
137 static int io_subchannel_remove(struct subchannel
*);
138 static void io_subchannel_shutdown(struct subchannel
*);
139 static int io_subchannel_sch_event(struct subchannel
*, int);
140 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
142 static void recovery_func(unsigned long data
);
144 static struct css_device_id io_subchannel_ids
[] = {
145 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
146 { /* end of list */ },
148 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
150 static int io_subchannel_prepare(struct subchannel
*sch
)
152 struct ccw_device
*cdev
;
154 * Don't allow suspend while a ccw device registration
155 * is still outstanding.
157 cdev
= sch_get_cdev(sch
);
158 if (cdev
&& !device_is_registered(&cdev
->dev
))
163 static int io_subchannel_settle(void)
167 ret
= wait_event_interruptible(ccw_device_init_wq
,
168 atomic_read(&ccw_device_init_count
) == 0);
171 flush_workqueue(cio_work_q
);
175 static struct css_driver io_subchannel_driver
= {
177 .owner
= THIS_MODULE
,
178 .name
= "io_subchannel",
180 .subchannel_type
= io_subchannel_ids
,
181 .irq
= io_subchannel_irq
,
182 .sch_event
= io_subchannel_sch_event
,
183 .chp_event
= io_subchannel_chp_event
,
184 .probe
= io_subchannel_probe
,
185 .remove
= io_subchannel_remove
,
186 .shutdown
= io_subchannel_shutdown
,
187 .prepare
= io_subchannel_prepare
,
188 .settle
= io_subchannel_settle
,
191 int __init
io_subchannel_init(void)
195 setup_timer(&recovery_timer
, recovery_func
, 0);
196 ret
= bus_register(&ccw_bus_type
);
199 ret
= css_driver_register(&io_subchannel_driver
);
201 bus_unregister(&ccw_bus_type
);
207 /************************ device handling **************************/
210 * A ccw_device has some interfaces in sysfs in addition to the
212 * The following entries are designed to export the information which
213 * resided in 2.4 in /proc/subchannels. Subchannel and device number
214 * are obvious, so they don't have an entry :)
215 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
218 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
220 struct subchannel
*sch
= to_subchannel(dev
);
221 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
226 for (chp
= 0; chp
< 8; chp
++) {
228 if (ssd
->path_mask
& mask
)
229 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
231 ret
+= sprintf(buf
+ ret
, "00 ");
233 ret
+= sprintf (buf
+ret
, "\n");
234 return min((ssize_t
)PAGE_SIZE
, ret
);
238 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
240 struct subchannel
*sch
= to_subchannel(dev
);
241 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
243 return sprintf (buf
, "%02x %02x %02x\n",
244 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
248 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
250 struct ccw_device
*cdev
= to_ccwdev(dev
);
251 struct ccw_device_id
*id
= &(cdev
->id
);
253 if (id
->dev_type
!= 0)
254 return sprintf(buf
, "%04x/%02x\n",
255 id
->dev_type
, id
->dev_model
);
257 return sprintf(buf
, "n/a\n");
261 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
263 struct ccw_device
*cdev
= to_ccwdev(dev
);
264 struct ccw_device_id
*id
= &(cdev
->id
);
266 return sprintf(buf
, "%04x/%02x\n",
267 id
->cu_type
, id
->cu_model
);
271 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
273 struct ccw_device
*cdev
= to_ccwdev(dev
);
274 struct ccw_device_id
*id
= &(cdev
->id
);
277 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
279 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
283 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
285 struct ccw_device
*cdev
= to_ccwdev(dev
);
287 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
290 int ccw_device_is_orphan(struct ccw_device
*cdev
)
292 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
295 static void ccw_device_unregister(struct ccw_device
*cdev
)
297 if (device_is_registered(&cdev
->dev
)) {
298 /* Undo device_add(). */
299 device_del(&cdev
->dev
);
301 if (cdev
->private->flags
.initialized
) {
302 cdev
->private->flags
.initialized
= 0;
303 /* Release reference from device_initialize(). */
304 put_device(&cdev
->dev
);
308 static void io_subchannel_quiesce(struct subchannel
*);
311 * ccw_device_set_offline() - disable a ccw device for I/O
312 * @cdev: target ccw device
314 * This function calls the driver's set_offline() function for @cdev, if
315 * given, and then disables @cdev.
317 * %0 on success and a negative error value on failure.
319 * enabled, ccw device lock not held
321 int ccw_device_set_offline(struct ccw_device
*cdev
)
323 struct subchannel
*sch
;
328 if (!cdev
->online
|| !cdev
->drv
)
331 if (cdev
->drv
->set_offline
) {
332 ret
= cdev
->drv
->set_offline(cdev
);
336 spin_lock_irq(cdev
->ccwlock
);
337 sch
= to_subchannel(cdev
->dev
.parent
);
339 /* Wait until a final state or DISCONNECTED is reached */
340 while (!dev_fsm_final_state(cdev
) &&
341 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
342 spin_unlock_irq(cdev
->ccwlock
);
343 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
344 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
345 spin_lock_irq(cdev
->ccwlock
);
348 ret
= ccw_device_offline(cdev
);
351 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
352 "0.%x.%04x\n", ret
, cdev
->private->dev_id
.ssid
,
353 cdev
->private->dev_id
.devno
);
356 state
= cdev
->private->state
;
357 spin_unlock_irq(cdev
->ccwlock
);
358 io_subchannel_quiesce(sch
);
359 spin_lock_irq(cdev
->ccwlock
);
360 cdev
->private->state
= state
;
361 } while (ret
== -EBUSY
);
362 spin_unlock_irq(cdev
->ccwlock
);
363 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
364 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
365 /* Inform the user if set offline failed. */
366 if (cdev
->private->state
== DEV_STATE_BOXED
) {
367 pr_warn("%s: The device entered boxed state while being set offline\n",
368 dev_name(&cdev
->dev
));
369 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
370 pr_warn("%s: The device stopped operating while being set offline\n",
371 dev_name(&cdev
->dev
));
373 /* Give up reference from ccw_device_set_online(). */
374 put_device(&cdev
->dev
);
378 cdev
->private->state
= DEV_STATE_OFFLINE
;
379 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
380 spin_unlock_irq(cdev
->ccwlock
);
381 /* Give up reference from ccw_device_set_online(). */
382 put_device(&cdev
->dev
);
387 * ccw_device_set_online() - enable a ccw device for I/O
388 * @cdev: target ccw device
390 * This function first enables @cdev and then calls the driver's set_online()
391 * function for @cdev, if given. If set_online() returns an error, @cdev is
394 * %0 on success and a negative error value on failure.
396 * enabled, ccw device lock not held
398 int ccw_device_set_online(struct ccw_device
*cdev
)
405 if (cdev
->online
|| !cdev
->drv
)
407 /* Hold on to an extra reference while device is online. */
408 if (!get_device(&cdev
->dev
))
411 spin_lock_irq(cdev
->ccwlock
);
412 ret
= ccw_device_online(cdev
);
413 spin_unlock_irq(cdev
->ccwlock
);
415 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
417 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
418 "device 0.%x.%04x\n",
419 ret
, cdev
->private->dev_id
.ssid
,
420 cdev
->private->dev_id
.devno
);
421 /* Give up online reference since onlining failed. */
422 put_device(&cdev
->dev
);
425 spin_lock_irq(cdev
->ccwlock
);
426 /* Check if online processing was successful */
427 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
428 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
429 spin_unlock_irq(cdev
->ccwlock
);
430 /* Inform the user that set online failed. */
431 if (cdev
->private->state
== DEV_STATE_BOXED
) {
432 pr_warn("%s: Setting the device online failed because it is boxed\n",
433 dev_name(&cdev
->dev
));
434 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
435 pr_warn("%s: Setting the device online failed because it is not operational\n",
436 dev_name(&cdev
->dev
));
438 /* Give up online reference since onlining failed. */
439 put_device(&cdev
->dev
);
442 spin_unlock_irq(cdev
->ccwlock
);
443 if (cdev
->drv
->set_online
)
444 ret
= cdev
->drv
->set_online(cdev
);
448 spin_lock_irq(cdev
->ccwlock
);
450 spin_unlock_irq(cdev
->ccwlock
);
454 spin_lock_irq(cdev
->ccwlock
);
455 /* Wait until a final state or DISCONNECTED is reached */
456 while (!dev_fsm_final_state(cdev
) &&
457 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
458 spin_unlock_irq(cdev
->ccwlock
);
459 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
460 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
461 spin_lock_irq(cdev
->ccwlock
);
463 ret2
= ccw_device_offline(cdev
);
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 /* Give up online reference since onlining failed. */
470 put_device(&cdev
->dev
);
474 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
475 "device 0.%x.%04x\n",
476 ret2
, cdev
->private->dev_id
.ssid
,
477 cdev
->private->dev_id
.devno
);
478 cdev
->private->state
= DEV_STATE_OFFLINE
;
479 spin_unlock_irq(cdev
->ccwlock
);
480 /* Give up online reference since onlining failed. */
481 put_device(&cdev
->dev
);
485 static int online_store_handle_offline(struct ccw_device
*cdev
)
487 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
) {
488 spin_lock_irq(cdev
->ccwlock
);
489 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
490 spin_unlock_irq(cdev
->ccwlock
);
493 if (cdev
->drv
&& cdev
->drv
->set_offline
)
494 return ccw_device_set_offline(cdev
);
498 static int online_store_recog_and_online(struct ccw_device
*cdev
)
500 /* Do device recognition, if needed. */
501 if (cdev
->private->state
== DEV_STATE_BOXED
) {
502 spin_lock_irq(cdev
->ccwlock
);
503 ccw_device_recognition(cdev
);
504 spin_unlock_irq(cdev
->ccwlock
);
505 wait_event(cdev
->private->wait_q
,
506 cdev
->private->flags
.recog_done
);
507 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
508 /* recognition failed */
511 if (cdev
->drv
&& cdev
->drv
->set_online
)
512 return ccw_device_set_online(cdev
);
516 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
520 ret
= online_store_recog_and_online(cdev
);
523 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
524 ret
= ccw_device_stlck(cdev
);
527 if (cdev
->id
.cu_type
== 0)
528 cdev
->private->state
= DEV_STATE_NOT_OPER
;
529 ret
= online_store_recog_and_online(cdev
);
536 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
537 const char *buf
, size_t count
)
539 struct ccw_device
*cdev
= to_ccwdev(dev
);
543 /* Prevent conflict between multiple on-/offline processing requests. */
544 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
546 /* Prevent conflict between internal I/Os and on-/offline processing. */
547 if (!dev_fsm_final_state(cdev
) &&
548 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
552 /* Prevent conflict between pending work and on-/offline processing.*/
553 if (work_pending(&cdev
->private->todo_work
)) {
557 if (!strncmp(buf
, "force\n", count
)) {
563 ret
= kstrtoul(buf
, 16, &i
);
571 ret
= online_store_handle_offline(cdev
);
574 ret
= online_store_handle_online(cdev
, force
);
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");
612 initiate_logging(struct device
*dev
, struct device_attribute
*attr
,
613 const char *buf
, size_t count
)
615 struct subchannel
*sch
= to_subchannel(dev
);
618 rc
= chsc_siosl(sch
->schid
);
620 pr_warn("Logging for subchannel 0.%x.%04x failed with errno=%d\n",
621 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
624 pr_notice("Logging for subchannel 0.%x.%04x was triggered\n",
625 sch
->schid
.ssid
, sch
->schid
.sch_no
);
629 static ssize_t
vpm_show(struct device
*dev
, struct device_attribute
*attr
,
632 struct subchannel
*sch
= to_subchannel(dev
);
634 return sprintf(buf
, "%02x\n", sch
->vpm
);
637 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
638 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
639 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
640 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
641 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
642 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
643 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
644 static DEVICE_ATTR(logging
, 0200, NULL
, initiate_logging
);
645 static DEVICE_ATTR(vpm
, 0444, vpm_show
, NULL
);
647 static struct attribute
*io_subchannel_attrs
[] = {
648 &dev_attr_chpids
.attr
,
649 &dev_attr_pimpampom
.attr
,
650 &dev_attr_logging
.attr
,
655 static struct attribute_group io_subchannel_attr_group
= {
656 .attrs
= io_subchannel_attrs
,
659 static struct attribute
* ccwdev_attrs
[] = {
660 &dev_attr_devtype
.attr
,
661 &dev_attr_cutype
.attr
,
662 &dev_attr_modalias
.attr
,
663 &dev_attr_online
.attr
,
664 &dev_attr_cmb_enable
.attr
,
665 &dev_attr_availability
.attr
,
669 static struct attribute_group ccwdev_attr_group
= {
670 .attrs
= ccwdev_attrs
,
673 static const struct attribute_group
*ccwdev_attr_groups
[] = {
678 static int ccw_device_add(struct ccw_device
*cdev
)
680 struct device
*dev
= &cdev
->dev
;
682 dev
->bus
= &ccw_bus_type
;
683 return device_add(dev
);
686 static int match_dev_id(struct device
*dev
, void *data
)
688 struct ccw_device
*cdev
= to_ccwdev(dev
);
689 struct ccw_dev_id
*dev_id
= data
;
691 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
695 * get_ccwdev_by_dev_id() - obtain device from a ccw device id
696 * @dev_id: id of the device to be searched
698 * This function searches all devices attached to the ccw bus for a device
701 * If a device is found its reference count is increased and returned;
702 * else %NULL is returned.
704 struct ccw_device
*get_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
)
708 dev
= bus_find_device(&ccw_bus_type
, NULL
, dev_id
, match_dev_id
);
710 return dev
? to_ccwdev(dev
) : NULL
;
712 EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id
);
714 static void ccw_device_do_unbind_bind(struct ccw_device
*cdev
)
718 if (device_is_registered(&cdev
->dev
)) {
719 device_release_driver(&cdev
->dev
);
720 ret
= device_attach(&cdev
->dev
);
721 WARN_ON(ret
== -ENODEV
);
726 ccw_device_release(struct device
*dev
)
728 struct ccw_device
*cdev
;
730 cdev
= to_ccwdev(dev
);
731 /* Release reference of parent subchannel. */
732 put_device(cdev
->dev
.parent
);
733 kfree(cdev
->private);
737 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
739 struct ccw_device
*cdev
;
741 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
743 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
744 GFP_KERNEL
| GFP_DMA
);
749 return ERR_PTR(-ENOMEM
);
752 static void ccw_device_todo(struct work_struct
*work
);
754 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
755 struct ccw_device
*cdev
)
757 struct ccw_device_private
*priv
= cdev
->private;
761 priv
->int_class
= IRQIO_CIO
;
762 priv
->state
= DEV_STATE_NOT_OPER
;
763 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
764 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
766 INIT_WORK(&priv
->todo_work
, ccw_device_todo
);
767 INIT_LIST_HEAD(&priv
->cmb_list
);
768 init_waitqueue_head(&priv
->wait_q
);
769 init_timer(&priv
->timer
);
771 atomic_set(&priv
->onoff
, 0);
772 cdev
->ccwlock
= sch
->lock
;
773 cdev
->dev
.parent
= &sch
->dev
;
774 cdev
->dev
.release
= ccw_device_release
;
775 cdev
->dev
.groups
= ccwdev_attr_groups
;
776 /* Do first half of device_register. */
777 device_initialize(&cdev
->dev
);
778 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
779 cdev
->private->dev_id
.devno
);
782 if (!get_device(&sch
->dev
)) {
786 priv
->flags
.initialized
= 1;
787 spin_lock_irq(sch
->lock
);
788 sch_set_cdev(sch
, cdev
);
789 spin_unlock_irq(sch
->lock
);
793 /* Release reference from device_initialize(). */
794 put_device(&cdev
->dev
);
798 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
800 struct ccw_device
*cdev
;
803 cdev
= io_subchannel_allocate_dev(sch
);
805 ret
= io_subchannel_initialize_dev(sch
, cdev
);
812 static void io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
814 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
816 struct ccw_device
*cdev
;
818 /* Need to allocate a new ccw device. */
819 cdev
= io_subchannel_create_ccwdev(sch
);
821 /* OK, we did everything we could... */
822 css_sch_device_unregister(sch
);
825 /* Start recognition for the new ccw device. */
826 io_subchannel_recog(cdev
, sch
);
830 * Register recognized device.
832 static void io_subchannel_register(struct ccw_device
*cdev
)
834 struct subchannel
*sch
;
835 int ret
, adjust_init_count
= 1;
838 sch
= to_subchannel(cdev
->dev
.parent
);
840 * Check if subchannel is still registered. It may have become
841 * unregistered if a machine check hit us after finishing
842 * device recognition but before the register work could be
845 if (!device_is_registered(&sch
->dev
))
847 css_update_ssd_info(sch
);
849 * io_subchannel_register() will also be called after device
850 * recognition has been done for a boxed device (which will already
851 * be registered). We need to reprobe since we may now have sense id
854 if (device_is_registered(&cdev
->dev
)) {
856 ret
= device_reprobe(&cdev
->dev
);
858 /* We can't do much here. */
859 CIO_MSG_EVENT(0, "device_reprobe() returned"
860 " %d for 0.%x.%04x\n", ret
,
861 cdev
->private->dev_id
.ssid
,
862 cdev
->private->dev_id
.devno
);
864 adjust_init_count
= 0;
868 * Now we know this subchannel will stay, we can throw
869 * our delayed uevent.
871 dev_set_uevent_suppress(&sch
->dev
, 0);
872 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
873 /* make it known to the system */
874 ret
= ccw_device_add(cdev
);
876 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
877 cdev
->private->dev_id
.ssid
,
878 cdev
->private->dev_id
.devno
, ret
);
879 spin_lock_irqsave(sch
->lock
, flags
);
880 sch_set_cdev(sch
, NULL
);
881 spin_unlock_irqrestore(sch
->lock
, flags
);
882 /* Release initial device reference. */
883 put_device(&cdev
->dev
);
887 cdev
->private->flags
.recog_done
= 1;
888 wake_up(&cdev
->private->wait_q
);
890 if (adjust_init_count
&& atomic_dec_and_test(&ccw_device_init_count
))
891 wake_up(&ccw_device_init_wq
);
894 static void ccw_device_call_sch_unregister(struct ccw_device
*cdev
)
896 struct subchannel
*sch
;
898 /* Get subchannel reference for local processing. */
899 if (!get_device(cdev
->dev
.parent
))
901 sch
= to_subchannel(cdev
->dev
.parent
);
902 css_sch_device_unregister(sch
);
903 /* Release subchannel reference for local processing. */
904 put_device(&sch
->dev
);
908 * subchannel recognition done. Called from the state machine.
911 io_subchannel_recog_done(struct ccw_device
*cdev
)
913 if (css_init_done
== 0) {
914 cdev
->private->flags
.recog_done
= 1;
917 switch (cdev
->private->state
) {
918 case DEV_STATE_BOXED
:
919 /* Device did not respond in time. */
920 case DEV_STATE_NOT_OPER
:
921 cdev
->private->flags
.recog_done
= 1;
922 /* Remove device found not operational. */
923 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
924 if (atomic_dec_and_test(&ccw_device_init_count
))
925 wake_up(&ccw_device_init_wq
);
927 case DEV_STATE_OFFLINE
:
929 * We can't register the device in interrupt context so
930 * we schedule a work item.
932 ccw_device_sched_todo(cdev
, CDEV_TODO_REGISTER
);
937 static void io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
939 /* Increase counter of devices currently in recognition. */
940 atomic_inc(&ccw_device_init_count
);
942 /* Start async. device sensing. */
943 spin_lock_irq(sch
->lock
);
944 ccw_device_recognition(cdev
);
945 spin_unlock_irq(sch
->lock
);
948 static int ccw_device_move_to_sch(struct ccw_device
*cdev
,
949 struct subchannel
*sch
)
951 struct subchannel
*old_sch
;
952 int rc
, old_enabled
= 0;
954 old_sch
= to_subchannel(cdev
->dev
.parent
);
955 /* Obtain child reference for new parent. */
956 if (!get_device(&sch
->dev
))
959 if (!sch_is_pseudo_sch(old_sch
)) {
960 spin_lock_irq(old_sch
->lock
);
961 old_enabled
= old_sch
->schib
.pmcw
.ena
;
964 rc
= cio_disable_subchannel(old_sch
);
965 spin_unlock_irq(old_sch
->lock
);
967 /* Release child reference for new parent. */
968 put_device(&sch
->dev
);
973 mutex_lock(&sch
->reg_mutex
);
974 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
975 mutex_unlock(&sch
->reg_mutex
);
977 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
978 cdev
->private->dev_id
.ssid
,
979 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
980 sch
->schib
.pmcw
.dev
, rc
);
982 /* Try to reenable the old subchannel. */
983 spin_lock_irq(old_sch
->lock
);
984 cio_enable_subchannel(old_sch
, (u32
)(addr_t
)old_sch
);
985 spin_unlock_irq(old_sch
->lock
);
987 /* Release child reference for new parent. */
988 put_device(&sch
->dev
);
991 /* Clean up old subchannel. */
992 if (!sch_is_pseudo_sch(old_sch
)) {
993 spin_lock_irq(old_sch
->lock
);
994 sch_set_cdev(old_sch
, NULL
);
995 spin_unlock_irq(old_sch
->lock
);
996 css_schedule_eval(old_sch
->schid
);
998 /* Release child reference for old parent. */
999 put_device(&old_sch
->dev
);
1000 /* Initialize new subchannel. */
1001 spin_lock_irq(sch
->lock
);
1002 cdev
->ccwlock
= sch
->lock
;
1003 if (!sch_is_pseudo_sch(sch
))
1004 sch_set_cdev(sch
, cdev
);
1005 spin_unlock_irq(sch
->lock
);
1006 if (!sch_is_pseudo_sch(sch
))
1007 css_update_ssd_info(sch
);
1011 static int ccw_device_move_to_orph(struct ccw_device
*cdev
)
1013 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1014 struct channel_subsystem
*css
= to_css(sch
->dev
.parent
);
1016 return ccw_device_move_to_sch(cdev
, css
->pseudo_subchannel
);
1019 static void io_subchannel_irq(struct subchannel
*sch
)
1021 struct ccw_device
*cdev
;
1023 cdev
= sch_get_cdev(sch
);
1025 CIO_TRACE_EVENT(6, "IRQ");
1026 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
1028 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1030 inc_irq_stat(IRQIO_CIO
);
1033 void io_subchannel_init_config(struct subchannel
*sch
)
1035 memset(&sch
->config
, 0, sizeof(sch
->config
));
1036 sch
->config
.csense
= 1;
1039 static void io_subchannel_init_fields(struct subchannel
*sch
)
1041 if (cio_is_console(sch
->schid
))
1044 sch
->opm
= chp_get_sch_opm(sch
);
1045 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1046 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1048 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1049 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1050 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1051 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1052 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1054 io_subchannel_init_config(sch
);
1058 * Note: We always return 0 so that we bind to the device even on error.
1059 * This is needed so that our remove function is called on unregister.
1061 static int io_subchannel_probe(struct subchannel
*sch
)
1063 struct io_subchannel_private
*io_priv
;
1064 struct ccw_device
*cdev
;
1067 if (cio_is_console(sch
->schid
)) {
1068 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1069 &io_subchannel_attr_group
);
1071 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1072 "attributes for subchannel "
1073 "0.%x.%04x (rc=%d)\n",
1074 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1076 * The console subchannel already has an associated ccw_device.
1077 * Throw the delayed uevent for the subchannel, register
1078 * the ccw_device and exit.
1080 dev_set_uevent_suppress(&sch
->dev
, 0);
1081 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1082 cdev
= sch_get_cdev(sch
);
1083 rc
= ccw_device_add(cdev
);
1085 /* Release online reference. */
1086 put_device(&cdev
->dev
);
1089 if (atomic_dec_and_test(&ccw_device_init_count
))
1090 wake_up(&ccw_device_init_wq
);
1093 io_subchannel_init_fields(sch
);
1094 rc
= cio_commit_config(sch
);
1097 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1098 &io_subchannel_attr_group
);
1101 /* Allocate I/O subchannel private data. */
1102 io_priv
= kzalloc(sizeof(*io_priv
), GFP_KERNEL
| GFP_DMA
);
1106 set_io_private(sch
, io_priv
);
1107 css_schedule_eval(sch
->schid
);
1111 spin_lock_irq(sch
->lock
);
1112 css_sched_sch_todo(sch
, SCH_TODO_UNREG
);
1113 spin_unlock_irq(sch
->lock
);
1118 io_subchannel_remove (struct subchannel
*sch
)
1120 struct io_subchannel_private
*io_priv
= to_io_private(sch
);
1121 struct ccw_device
*cdev
;
1123 cdev
= sch_get_cdev(sch
);
1126 io_subchannel_quiesce(sch
);
1127 /* Set ccw device to not operational and drop reference. */
1128 spin_lock_irq(cdev
->ccwlock
);
1129 sch_set_cdev(sch
, NULL
);
1130 set_io_private(sch
, NULL
);
1131 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1132 spin_unlock_irq(cdev
->ccwlock
);
1133 ccw_device_unregister(cdev
);
1136 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1140 static void io_subchannel_verify(struct subchannel
*sch
)
1142 struct ccw_device
*cdev
;
1144 cdev
= sch_get_cdev(sch
);
1146 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1149 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1151 struct ccw_device
*cdev
;
1153 cdev
= sch_get_cdev(sch
);
1156 if (cio_update_schib(sch
))
1158 /* Check for I/O on path. */
1159 if (scsw_actl(&sch
->schib
.scsw
) == 0 || sch
->schib
.pmcw
.lpum
!= mask
)
1161 if (cdev
->private->state
== DEV_STATE_ONLINE
) {
1162 ccw_device_kill_io(cdev
);
1168 /* Trigger path verification. */
1169 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1173 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1176 static int io_subchannel_chp_event(struct subchannel
*sch
,
1177 struct chp_link
*link
, int event
)
1179 struct ccw_device
*cdev
= sch_get_cdev(sch
);
1182 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1190 cdev
->private->path_gone_mask
|= mask
;
1191 io_subchannel_terminate_path(sch
, mask
);
1197 cdev
->private->path_new_mask
|= mask
;
1198 io_subchannel_verify(sch
);
1201 if (cio_update_schib(sch
))
1204 cdev
->private->path_gone_mask
|= mask
;
1205 io_subchannel_terminate_path(sch
, mask
);
1208 if (cio_update_schib(sch
))
1210 sch
->lpm
|= mask
& sch
->opm
;
1212 cdev
->private->path_new_mask
|= mask
;
1213 io_subchannel_verify(sch
);
1219 static void io_subchannel_quiesce(struct subchannel
*sch
)
1221 struct ccw_device
*cdev
;
1224 spin_lock_irq(sch
->lock
);
1225 cdev
= sch_get_cdev(sch
);
1226 if (cio_is_console(sch
->schid
))
1228 if (!sch
->schib
.pmcw
.ena
)
1230 ret
= cio_disable_subchannel(sch
);
1234 cdev
->handler(cdev
, cdev
->private->intparm
, ERR_PTR(-EIO
));
1235 while (ret
== -EBUSY
) {
1236 cdev
->private->state
= DEV_STATE_QUIESCE
;
1237 cdev
->private->iretry
= 255;
1238 ret
= ccw_device_cancel_halt_clear(cdev
);
1239 if (ret
== -EBUSY
) {
1240 ccw_device_set_timeout(cdev
, HZ
/10);
1241 spin_unlock_irq(sch
->lock
);
1242 wait_event(cdev
->private->wait_q
,
1243 cdev
->private->state
!= DEV_STATE_QUIESCE
);
1244 spin_lock_irq(sch
->lock
);
1246 ret
= cio_disable_subchannel(sch
);
1249 spin_unlock_irq(sch
->lock
);
1252 static void io_subchannel_shutdown(struct subchannel
*sch
)
1254 io_subchannel_quiesce(sch
);
1257 static int device_is_disconnected(struct ccw_device
*cdev
)
1261 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1262 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1265 static int recovery_check(struct device
*dev
, void *data
)
1267 struct ccw_device
*cdev
= to_ccwdev(dev
);
1270 spin_lock_irq(cdev
->ccwlock
);
1271 switch (cdev
->private->state
) {
1272 case DEV_STATE_DISCONNECTED
:
1273 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1274 cdev
->private->dev_id
.ssid
,
1275 cdev
->private->dev_id
.devno
);
1276 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1279 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1283 spin_unlock_irq(cdev
->ccwlock
);
1288 static void recovery_work_func(struct work_struct
*unused
)
1292 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1294 spin_lock_irq(&recovery_lock
);
1295 if (!timer_pending(&recovery_timer
)) {
1296 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1298 mod_timer(&recovery_timer
, jiffies
+
1299 recovery_delay
[recovery_phase
] * HZ
);
1301 spin_unlock_irq(&recovery_lock
);
1303 CIO_MSG_EVENT(4, "recovery: end\n");
1306 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1308 static void recovery_func(unsigned long data
)
1311 * We can't do our recovery in softirq context and it's not
1312 * performance critical, so we schedule it.
1314 schedule_work(&recovery_work
);
1317 static void ccw_device_schedule_recovery(void)
1319 unsigned long flags
;
1321 CIO_MSG_EVENT(4, "recovery: schedule\n");
1322 spin_lock_irqsave(&recovery_lock
, flags
);
1323 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1325 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1327 spin_unlock_irqrestore(&recovery_lock
, flags
);
1330 static int purge_fn(struct device
*dev
, void *data
)
1332 struct ccw_device
*cdev
= to_ccwdev(dev
);
1333 struct ccw_dev_id
*id
= &cdev
->private->dev_id
;
1335 spin_lock_irq(cdev
->ccwlock
);
1336 if (is_blacklisted(id
->ssid
, id
->devno
) &&
1337 (cdev
->private->state
== DEV_STATE_OFFLINE
) &&
1338 (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) == 0)) {
1339 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id
->ssid
,
1341 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1342 atomic_set(&cdev
->private->onoff
, 0);
1344 spin_unlock_irq(cdev
->ccwlock
);
1345 /* Abort loop in case of pending signal. */
1346 if (signal_pending(current
))
1353 * ccw_purge_blacklisted - purge unused, blacklisted devices
1355 * Unregister all ccw devices that are offline and on the blacklist.
1357 int ccw_purge_blacklisted(void)
1359 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1360 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1364 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1368 ccw_device_set_timeout(cdev
, 0);
1369 cdev
->private->flags
.fake_irb
= 0;
1370 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1372 ccw_device_schedule_recovery();
1375 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1377 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1379 CIO_TRACE_EVENT(2, "notoper");
1380 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1381 ccw_device_set_timeout(cdev
, 0);
1382 cio_disable_subchannel(sch
);
1383 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1386 enum io_sch_action
{
1390 IO_SCH_UNREG_ATTACH
,
1398 static enum io_sch_action
sch_get_action(struct subchannel
*sch
)
1400 struct ccw_device
*cdev
;
1402 cdev
= sch_get_cdev(sch
);
1403 if (cio_update_schib(sch
)) {
1404 /* Not operational. */
1406 return IO_SCH_UNREG
;
1407 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1408 return IO_SCH_UNREG
;
1409 return IO_SCH_ORPH_UNREG
;
1413 return IO_SCH_ATTACH
;
1414 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1415 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1416 return IO_SCH_UNREG_ATTACH
;
1417 return IO_SCH_ORPH_ATTACH
;
1419 if ((sch
->schib
.pmcw
.pam
& sch
->opm
) == 0) {
1420 if (ccw_device_notify(cdev
, CIO_NO_PATH
) != NOTIFY_OK
)
1421 return IO_SCH_UNREG
;
1424 if (device_is_disconnected(cdev
))
1425 return IO_SCH_REPROBE
;
1426 if (cdev
->online
&& !cdev
->private->flags
.resuming
)
1427 return IO_SCH_VERIFY
;
1428 if (cdev
->private->state
== DEV_STATE_NOT_OPER
)
1429 return IO_SCH_UNREG_ATTACH
;
1434 * io_subchannel_sch_event - process subchannel event
1436 * @process: non-zero if function is called in process context
1438 * An unspecified event occurred for this subchannel. Adjust data according
1439 * to the current operational state of the subchannel and device. Return
1440 * zero when the event has been handled sufficiently or -EAGAIN when this
1441 * function should be called again in process context.
1443 static int io_subchannel_sch_event(struct subchannel
*sch
, int process
)
1445 unsigned long flags
;
1446 struct ccw_device
*cdev
;
1447 struct ccw_dev_id dev_id
;
1448 enum io_sch_action action
;
1451 spin_lock_irqsave(sch
->lock
, flags
);
1452 if (!device_is_registered(&sch
->dev
))
1454 if (work_pending(&sch
->todo_work
))
1456 cdev
= sch_get_cdev(sch
);
1457 if (cdev
&& work_pending(&cdev
->private->todo_work
))
1459 action
= sch_get_action(sch
);
1460 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1461 sch
->schid
.ssid
, sch
->schid
.sch_no
, process
,
1463 /* Perform immediate actions while holding the lock. */
1465 case IO_SCH_REPROBE
:
1466 /* Trigger device recognition. */
1467 ccw_device_trigger_reprobe(cdev
);
1471 /* Trigger path verification. */
1472 io_subchannel_verify(sch
);
1476 ccw_device_set_disconnected(cdev
);
1479 case IO_SCH_ORPH_UNREG
:
1480 case IO_SCH_ORPH_ATTACH
:
1481 ccw_device_set_disconnected(cdev
);
1483 case IO_SCH_UNREG_ATTACH
:
1487 if (cdev
->private->state
== DEV_STATE_SENSE_ID
) {
1489 * Note: delayed work triggered by this event
1490 * and repeated calls to sch_event are synchronized
1491 * by the above check for work_pending(cdev).
1493 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1495 ccw_device_set_notoper(cdev
);
1503 spin_unlock_irqrestore(sch
->lock
, flags
);
1504 /* All other actions require process context. */
1507 /* Handle attached ccw device. */
1509 case IO_SCH_ORPH_UNREG
:
1510 case IO_SCH_ORPH_ATTACH
:
1511 /* Move ccw device to orphanage. */
1512 rc
= ccw_device_move_to_orph(cdev
);
1516 case IO_SCH_UNREG_ATTACH
:
1517 spin_lock_irqsave(sch
->lock
, flags
);
1518 if (cdev
->private->flags
.resuming
) {
1519 /* Device will be handled later. */
1523 sch_set_cdev(sch
, NULL
);
1524 spin_unlock_irqrestore(sch
->lock
, flags
);
1525 /* Unregister ccw device. */
1526 ccw_device_unregister(cdev
);
1531 /* Handle subchannel. */
1533 case IO_SCH_ORPH_UNREG
:
1535 if (!cdev
|| !cdev
->private->flags
.resuming
)
1536 css_sch_device_unregister(sch
);
1538 case IO_SCH_ORPH_ATTACH
:
1539 case IO_SCH_UNREG_ATTACH
:
1541 dev_id
.ssid
= sch
->schid
.ssid
;
1542 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1543 cdev
= get_ccwdev_by_dev_id(&dev_id
);
1545 sch_create_and_recog_new_device(sch
);
1548 rc
= ccw_device_move_to_sch(cdev
, sch
);
1550 /* Release reference from get_ccwdev_by_dev_id() */
1551 put_device(&cdev
->dev
);
1554 spin_lock_irqsave(sch
->lock
, flags
);
1555 ccw_device_trigger_reprobe(cdev
);
1556 spin_unlock_irqrestore(sch
->lock
, flags
);
1557 /* Release reference from get_ccwdev_by_dev_id() */
1558 put_device(&cdev
->dev
);
1566 spin_unlock_irqrestore(sch
->lock
, flags
);
1571 static void ccw_device_set_int_class(struct ccw_device
*cdev
)
1573 struct ccw_driver
*cdrv
= cdev
->drv
;
1575 /* Note: we interpret class 0 in this context as an uninitialized
1576 * field since it translates to a non-I/O interrupt class. */
1577 if (cdrv
->int_class
!= 0)
1578 cdev
->private->int_class
= cdrv
->int_class
;
1580 cdev
->private->int_class
= IRQIO_CIO
;
1583 #ifdef CONFIG_CCW_CONSOLE
1584 int __init
ccw_device_enable_console(struct ccw_device
*cdev
)
1586 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1589 if (!cdev
->drv
|| !cdev
->handler
)
1592 io_subchannel_init_fields(sch
);
1593 rc
= cio_commit_config(sch
);
1596 sch
->driver
= &io_subchannel_driver
;
1597 io_subchannel_recog(cdev
, sch
);
1598 /* Now wait for the async. recognition to come to an end. */
1599 spin_lock_irq(cdev
->ccwlock
);
1600 while (!dev_fsm_final_state(cdev
))
1601 ccw_device_wait_idle(cdev
);
1603 /* Hold on to an extra reference while device is online. */
1604 get_device(&cdev
->dev
);
1605 rc
= ccw_device_online(cdev
);
1609 while (!dev_fsm_final_state(cdev
))
1610 ccw_device_wait_idle(cdev
);
1612 if (cdev
->private->state
== DEV_STATE_ONLINE
)
1617 spin_unlock_irq(cdev
->ccwlock
);
1618 if (rc
) /* Give up online reference since onlining failed. */
1619 put_device(&cdev
->dev
);
1623 struct ccw_device
* __init
ccw_device_create_console(struct ccw_driver
*drv
)
1625 struct io_subchannel_private
*io_priv
;
1626 struct ccw_device
*cdev
;
1627 struct subchannel
*sch
;
1629 sch
= cio_probe_console();
1631 return ERR_CAST(sch
);
1633 io_priv
= kzalloc(sizeof(*io_priv
), GFP_KERNEL
| GFP_DMA
);
1635 put_device(&sch
->dev
);
1636 return ERR_PTR(-ENOMEM
);
1638 set_io_private(sch
, io_priv
);
1639 cdev
= io_subchannel_create_ccwdev(sch
);
1641 put_device(&sch
->dev
);
1646 ccw_device_set_int_class(cdev
);
1650 void __init
ccw_device_destroy_console(struct ccw_device
*cdev
)
1652 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1653 struct io_subchannel_private
*io_priv
= to_io_private(sch
);
1655 set_io_private(sch
, NULL
);
1656 put_device(&sch
->dev
);
1657 put_device(&cdev
->dev
);
1662 * ccw_device_wait_idle() - busy wait for device to become idle
1665 * Poll until activity control is zero, that is, no function or data
1666 * transfer is pending/active.
1667 * Called with device lock being held.
1669 void ccw_device_wait_idle(struct ccw_device
*cdev
)
1671 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1675 if (sch
->schib
.scsw
.cmd
.actl
== 0)
1681 static int ccw_device_pm_restore(struct device
*dev
);
1683 int ccw_device_force_console(struct ccw_device
*cdev
)
1685 return ccw_device_pm_restore(&cdev
->dev
);
1687 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1691 * get ccw_device matching the busid, but only if owned by cdrv
1694 __ccwdev_check_busid(struct device
*dev
, void *id
)
1700 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1705 * get_ccwdev_by_busid() - obtain device from a bus id
1706 * @cdrv: driver the device is owned by
1707 * @bus_id: bus id of the device to be searched
1709 * This function searches all devices owned by @cdrv for a device with a bus
1710 * id matching @bus_id.
1712 * If a match is found, its reference count of the found device is increased
1713 * and it is returned; else %NULL is returned.
1715 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1720 dev
= driver_find_device(&cdrv
->driver
, NULL
, (void *)bus_id
,
1721 __ccwdev_check_busid
);
1723 return dev
? to_ccwdev(dev
) : NULL
;
1726 /************************** device driver handling ************************/
1728 /* This is the implementation of the ccw_driver class. The probe, remove
1729 * and release methods are initially very similar to the device_driver
1730 * implementations, with the difference that they have ccw_device
1733 * A ccw driver also contains the information that is needed for
1737 ccw_device_probe (struct device
*dev
)
1739 struct ccw_device
*cdev
= to_ccwdev(dev
);
1740 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1743 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1744 ccw_device_set_int_class(cdev
);
1745 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1748 cdev
->private->int_class
= IRQIO_CIO
;
1755 static int ccw_device_remove(struct device
*dev
)
1757 struct ccw_device
*cdev
= to_ccwdev(dev
);
1758 struct ccw_driver
*cdrv
= cdev
->drv
;
1764 spin_lock_irq(cdev
->ccwlock
);
1767 ret
= ccw_device_offline(cdev
);
1768 spin_unlock_irq(cdev
->ccwlock
);
1770 wait_event(cdev
->private->wait_q
,
1771 dev_fsm_final_state(cdev
));
1773 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1774 "device 0.%x.%04x\n",
1775 ret
, cdev
->private->dev_id
.ssid
,
1776 cdev
->private->dev_id
.devno
);
1777 /* Give up reference obtained in ccw_device_set_online(). */
1778 put_device(&cdev
->dev
);
1779 spin_lock_irq(cdev
->ccwlock
);
1781 ccw_device_set_timeout(cdev
, 0);
1783 cdev
->private->int_class
= IRQIO_CIO
;
1784 spin_unlock_irq(cdev
->ccwlock
);
1785 __disable_cmf(cdev
);
1790 static void ccw_device_shutdown(struct device
*dev
)
1792 struct ccw_device
*cdev
;
1794 cdev
= to_ccwdev(dev
);
1795 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1796 cdev
->drv
->shutdown(cdev
);
1797 __disable_cmf(cdev
);
1800 static int ccw_device_pm_prepare(struct device
*dev
)
1802 struct ccw_device
*cdev
= to_ccwdev(dev
);
1804 if (work_pending(&cdev
->private->todo_work
))
1806 /* Fail while device is being set online/offline. */
1807 if (atomic_read(&cdev
->private->onoff
))
1810 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1811 return cdev
->drv
->prepare(cdev
);
1816 static void ccw_device_pm_complete(struct device
*dev
)
1818 struct ccw_device
*cdev
= to_ccwdev(dev
);
1820 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1821 cdev
->drv
->complete(cdev
);
1824 static int ccw_device_pm_freeze(struct device
*dev
)
1826 struct ccw_device
*cdev
= to_ccwdev(dev
);
1827 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1828 int ret
, cm_enabled
;
1830 /* Fail suspend while device is in transistional state. */
1831 if (!dev_fsm_final_state(cdev
))
1835 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1836 ret
= cdev
->drv
->freeze(cdev
);
1841 spin_lock_irq(sch
->lock
);
1842 cm_enabled
= cdev
->private->cmb
!= NULL
;
1843 spin_unlock_irq(sch
->lock
);
1845 /* Don't have the css write on memory. */
1846 ret
= ccw_set_cmf(cdev
, 0);
1850 /* From here on, disallow device driver I/O. */
1851 spin_lock_irq(sch
->lock
);
1852 ret
= cio_disable_subchannel(sch
);
1853 spin_unlock_irq(sch
->lock
);
1858 static int ccw_device_pm_thaw(struct device
*dev
)
1860 struct ccw_device
*cdev
= to_ccwdev(dev
);
1861 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1862 int ret
, cm_enabled
;
1867 spin_lock_irq(sch
->lock
);
1868 /* Allow device driver I/O again. */
1869 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1870 cm_enabled
= cdev
->private->cmb
!= NULL
;
1871 spin_unlock_irq(sch
->lock
);
1876 ret
= ccw_set_cmf(cdev
, 1);
1881 if (cdev
->drv
&& cdev
->drv
->thaw
)
1882 ret
= cdev
->drv
->thaw(cdev
);
1887 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
1889 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1891 spin_lock_irq(sch
->lock
);
1892 if (cio_is_console(sch
->schid
)) {
1893 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1897 * While we were sleeping, devices may have gone or become
1898 * available again. Kick re-detection.
1900 cdev
->private->flags
.resuming
= 1;
1901 cdev
->private->path_new_mask
= LPM_ANYPATH
;
1902 css_sched_sch_todo(sch
, SCH_TODO_EVAL
);
1903 spin_unlock_irq(sch
->lock
);
1904 css_wait_for_slow_path();
1906 /* cdev may have been moved to a different subchannel. */
1907 sch
= to_subchannel(cdev
->dev
.parent
);
1908 spin_lock_irq(sch
->lock
);
1909 if (cdev
->private->state
!= DEV_STATE_ONLINE
&&
1910 cdev
->private->state
!= DEV_STATE_OFFLINE
)
1913 ccw_device_recognition(cdev
);
1914 spin_unlock_irq(sch
->lock
);
1915 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
1916 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
1917 spin_lock_irq(sch
->lock
);
1920 cdev
->private->flags
.resuming
= 0;
1921 spin_unlock_irq(sch
->lock
);
1924 static int resume_handle_boxed(struct ccw_device
*cdev
)
1926 cdev
->private->state
= DEV_STATE_BOXED
;
1927 if (ccw_device_notify(cdev
, CIO_BOXED
) == NOTIFY_OK
)
1929 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1933 static int resume_handle_disc(struct ccw_device
*cdev
)
1935 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1936 if (ccw_device_notify(cdev
, CIO_GONE
) == NOTIFY_OK
)
1938 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1942 static int ccw_device_pm_restore(struct device
*dev
)
1944 struct ccw_device
*cdev
= to_ccwdev(dev
);
1945 struct subchannel
*sch
;
1948 __ccw_device_pm_restore(cdev
);
1949 sch
= to_subchannel(cdev
->dev
.parent
);
1950 spin_lock_irq(sch
->lock
);
1951 if (cio_is_console(sch
->schid
))
1954 /* check recognition results */
1955 switch (cdev
->private->state
) {
1956 case DEV_STATE_OFFLINE
:
1957 case DEV_STATE_ONLINE
:
1958 cdev
->private->flags
.donotify
= 0;
1960 case DEV_STATE_BOXED
:
1961 ret
= resume_handle_boxed(cdev
);
1966 ret
= resume_handle_disc(cdev
);
1971 /* check if the device type has changed */
1972 if (!ccw_device_test_sense_data(cdev
)) {
1973 ccw_device_update_sense_data(cdev
);
1974 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
1981 if (ccw_device_online(cdev
)) {
1982 ret
= resume_handle_disc(cdev
);
1987 spin_unlock_irq(sch
->lock
);
1988 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1989 spin_lock_irq(sch
->lock
);
1991 if (ccw_device_notify(cdev
, CIO_OPER
) == NOTIFY_BAD
) {
1992 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1997 /* reenable cmf, if needed */
1998 if (cdev
->private->cmb
) {
1999 spin_unlock_irq(sch
->lock
);
2000 ret
= ccw_set_cmf(cdev
, 1);
2001 spin_lock_irq(sch
->lock
);
2003 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
2004 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
2005 cdev
->private->dev_id
.devno
, ret
);
2011 spin_unlock_irq(sch
->lock
);
2012 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
2013 ret
= cdev
->drv
->restore(cdev
);
2017 spin_unlock_irq(sch
->lock
);
2021 static const struct dev_pm_ops ccw_pm_ops
= {
2022 .prepare
= ccw_device_pm_prepare
,
2023 .complete
= ccw_device_pm_complete
,
2024 .freeze
= ccw_device_pm_freeze
,
2025 .thaw
= ccw_device_pm_thaw
,
2026 .restore
= ccw_device_pm_restore
,
2029 static struct bus_type ccw_bus_type
= {
2031 .match
= ccw_bus_match
,
2032 .uevent
= ccw_uevent
,
2033 .probe
= ccw_device_probe
,
2034 .remove
= ccw_device_remove
,
2035 .shutdown
= ccw_device_shutdown
,
2040 * ccw_driver_register() - register a ccw driver
2041 * @cdriver: driver to be registered
2043 * This function is mainly a wrapper around driver_register().
2045 * %0 on success and a negative error value on failure.
2047 int ccw_driver_register(struct ccw_driver
*cdriver
)
2049 struct device_driver
*drv
= &cdriver
->driver
;
2051 drv
->bus
= &ccw_bus_type
;
2053 return driver_register(drv
);
2057 * ccw_driver_unregister() - deregister a ccw driver
2058 * @cdriver: driver to be deregistered
2060 * This function is mainly a wrapper around driver_unregister().
2062 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
2064 driver_unregister(&cdriver
->driver
);
2067 static void ccw_device_todo(struct work_struct
*work
)
2069 struct ccw_device_private
*priv
;
2070 struct ccw_device
*cdev
;
2071 struct subchannel
*sch
;
2072 enum cdev_todo todo
;
2074 priv
= container_of(work
, struct ccw_device_private
, todo_work
);
2076 sch
= to_subchannel(cdev
->dev
.parent
);
2077 /* Find out todo. */
2078 spin_lock_irq(cdev
->ccwlock
);
2080 priv
->todo
= CDEV_TODO_NOTHING
;
2081 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
2082 priv
->dev_id
.ssid
, priv
->dev_id
.devno
, todo
);
2083 spin_unlock_irq(cdev
->ccwlock
);
2086 case CDEV_TODO_ENABLE_CMF
:
2089 case CDEV_TODO_REBIND
:
2090 ccw_device_do_unbind_bind(cdev
);
2092 case CDEV_TODO_REGISTER
:
2093 io_subchannel_register(cdev
);
2095 case CDEV_TODO_UNREG_EVAL
:
2096 if (!sch_is_pseudo_sch(sch
))
2097 css_schedule_eval(sch
->schid
);
2099 case CDEV_TODO_UNREG
:
2100 if (sch_is_pseudo_sch(sch
))
2101 ccw_device_unregister(cdev
);
2103 ccw_device_call_sch_unregister(cdev
);
2108 /* Release workqueue ref. */
2109 put_device(&cdev
->dev
);
2113 * ccw_device_sched_todo - schedule ccw device operation
2117 * Schedule the operation identified by @todo to be performed on the slow path
2118 * workqueue. Do nothing if another operation with higher priority is already
2119 * scheduled. Needs to be called with ccwdev lock held.
2121 void ccw_device_sched_todo(struct ccw_device
*cdev
, enum cdev_todo todo
)
2123 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2124 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
2126 if (cdev
->private->todo
>= todo
)
2128 cdev
->private->todo
= todo
;
2129 /* Get workqueue ref. */
2130 if (!get_device(&cdev
->dev
))
2132 if (!queue_work(cio_work_q
, &cdev
->private->todo_work
)) {
2133 /* Already queued, release workqueue ref. */
2134 put_device(&cdev
->dev
);
2139 * ccw_device_siosl() - initiate logging
2142 * This function is used to invoke model-dependent logging within the channel
2145 int ccw_device_siosl(struct ccw_device
*cdev
)
2147 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2149 return chsc_siosl(sch
->schid
);
2151 EXPORT_SYMBOL_GPL(ccw_device_siosl
);
2153 MODULE_LICENSE("GPL");
2154 EXPORT_SYMBOL(ccw_device_set_online
);
2155 EXPORT_SYMBOL(ccw_device_set_offline
);
2156 EXPORT_SYMBOL(ccw_driver_register
);
2157 EXPORT_SYMBOL(ccw_driver_unregister
);
2158 EXPORT_SYMBOL(get_ccwdev_by_busid
);