2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
5 * Copyright IBM Corp. 2002,2008
6 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/spinlock.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include <linux/list.h>
21 #include <linux/device.h>
22 #include <linux/workqueue.h>
23 #include <linux/timer.h>
25 #include <asm/ccwdev.h>
27 #include <asm/param.h> /* HZ */
33 #include "cio_debug.h"
38 #include "blacklist.h"
40 static struct timer_list recovery_timer
;
41 static DEFINE_SPINLOCK(recovery_lock
);
42 static int recovery_phase
;
43 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
45 /******************* bus type handling ***********************/
47 /* The Linux driver model distinguishes between a bus type and
48 * the bus itself. Of course we only have one channel
49 * subsystem driver and one channel system per machine, but
50 * we still use the abstraction. T.R. says it's a good idea. */
52 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
54 struct ccw_device
*cdev
= to_ccwdev(dev
);
55 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
56 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
61 found
= ccw_device_id_match(ids
, &cdev
->id
);
65 cdev
->id
.driver_info
= found
->driver_info
;
70 /* Store modalias string delimited by prefix/suffix string into buffer with
71 * specified size. Return length of resulting string (excluding trailing '\0')
72 * even if string doesn't fit buffer (snprintf semantics). */
73 static int snprint_alias(char *buf
, size_t size
,
74 struct ccw_device_id
*id
, const char *suffix
)
78 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
84 if (id
->dev_type
!= 0)
85 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
86 id
->dev_model
, suffix
);
88 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
93 /* Set up environment variables for ccw device uevent. Return 0 on success,
94 * non-zero otherwise. */
95 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
97 struct ccw_device
*cdev
= to_ccwdev(dev
);
98 struct ccw_device_id
*id
= &(cdev
->id
);
100 char modalias_buf
[30];
103 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
108 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
112 /* The next two can be zero, that's ok for us */
114 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
119 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
124 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
125 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
129 struct bus_type ccw_bus_type
;
131 static void io_subchannel_irq(struct subchannel
*);
132 static int io_subchannel_probe(struct subchannel
*);
133 static int io_subchannel_remove(struct subchannel
*);
134 static void io_subchannel_shutdown(struct subchannel
*);
135 static int io_subchannel_sch_event(struct subchannel
*, int);
136 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
138 static void recovery_func(unsigned long data
);
139 struct workqueue_struct
*ccw_device_work
;
140 wait_queue_head_t ccw_device_init_wq
;
141 atomic_t ccw_device_init_count
;
143 static struct css_device_id io_subchannel_ids
[] = {
144 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
145 { /* end of list */ },
147 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
149 static int io_subchannel_prepare(struct subchannel
*sch
)
151 struct ccw_device
*cdev
;
153 * Don't allow suspend while a ccw device registration
154 * is still outstanding.
156 cdev
= sch_get_cdev(sch
);
157 if (cdev
&& !device_is_registered(&cdev
->dev
))
162 static void io_subchannel_settle(void)
164 wait_event(ccw_device_init_wq
,
165 atomic_read(&ccw_device_init_count
) == 0);
166 flush_workqueue(ccw_device_work
);
169 static struct css_driver io_subchannel_driver
= {
170 .owner
= THIS_MODULE
,
171 .subchannel_type
= io_subchannel_ids
,
172 .name
= "io_subchannel",
173 .irq
= io_subchannel_irq
,
174 .sch_event
= io_subchannel_sch_event
,
175 .chp_event
= io_subchannel_chp_event
,
176 .probe
= io_subchannel_probe
,
177 .remove
= io_subchannel_remove
,
178 .shutdown
= io_subchannel_shutdown
,
179 .prepare
= io_subchannel_prepare
,
180 .settle
= io_subchannel_settle
,
183 int __init
io_subchannel_init(void)
187 init_waitqueue_head(&ccw_device_init_wq
);
188 atomic_set(&ccw_device_init_count
, 0);
189 setup_timer(&recovery_timer
, recovery_func
, 0);
191 ccw_device_work
= create_singlethread_workqueue("cio");
192 if (!ccw_device_work
)
194 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
199 if ((ret
= bus_register (&ccw_bus_type
)))
202 ret
= css_driver_register(&io_subchannel_driver
);
209 destroy_workqueue(ccw_device_work
);
211 destroy_workqueue(slow_path_wq
);
216 /************************ device handling **************************/
219 * A ccw_device has some interfaces in sysfs in addition to the
221 * The following entries are designed to export the information which
222 * resided in 2.4 in /proc/subchannels. Subchannel and device number
223 * are obvious, so they don't have an entry :)
224 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
227 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
229 struct subchannel
*sch
= to_subchannel(dev
);
230 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
235 for (chp
= 0; chp
< 8; chp
++) {
237 if (ssd
->path_mask
& mask
)
238 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
240 ret
+= sprintf(buf
+ ret
, "00 ");
242 ret
+= sprintf (buf
+ret
, "\n");
243 return min((ssize_t
)PAGE_SIZE
, ret
);
247 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
249 struct subchannel
*sch
= to_subchannel(dev
);
250 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
252 return sprintf (buf
, "%02x %02x %02x\n",
253 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
257 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
259 struct ccw_device
*cdev
= to_ccwdev(dev
);
260 struct ccw_device_id
*id
= &(cdev
->id
);
262 if (id
->dev_type
!= 0)
263 return sprintf(buf
, "%04x/%02x\n",
264 id
->dev_type
, id
->dev_model
);
266 return sprintf(buf
, "n/a\n");
270 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
272 struct ccw_device
*cdev
= to_ccwdev(dev
);
273 struct ccw_device_id
*id
= &(cdev
->id
);
275 return sprintf(buf
, "%04x/%02x\n",
276 id
->cu_type
, id
->cu_model
);
280 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
282 struct ccw_device
*cdev
= to_ccwdev(dev
);
283 struct ccw_device_id
*id
= &(cdev
->id
);
286 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
288 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
292 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
294 struct ccw_device
*cdev
= to_ccwdev(dev
);
296 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
299 int ccw_device_is_orphan(struct ccw_device
*cdev
)
301 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
304 static void ccw_device_unregister(struct ccw_device
*cdev
)
306 if (test_and_clear_bit(1, &cdev
->private->registered
)) {
307 device_del(&cdev
->dev
);
308 /* Release reference from device_initialize(). */
309 put_device(&cdev
->dev
);
314 * ccw_device_set_offline() - disable a ccw device for I/O
315 * @cdev: target ccw device
317 * This function calls the driver's set_offline() function for @cdev, if
318 * given, and then disables @cdev.
320 * %0 on success and a negative error value on failure.
322 * enabled, ccw device lock not held
324 int ccw_device_set_offline(struct ccw_device
*cdev
)
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 /* Wait until a final state or DISCONNECTED is reached */
341 while (!dev_fsm_final_state(cdev
) &&
342 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
343 spin_unlock_irq(cdev
->ccwlock
);
344 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
345 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
346 spin_lock_irq(cdev
->ccwlock
);
348 ret
= ccw_device_offline(cdev
);
351 spin_unlock_irq(cdev
->ccwlock
);
352 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
353 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
354 /* Inform the user if set offline failed. */
355 if (cdev
->private->state
== DEV_STATE_BOXED
) {
356 pr_warning("%s: The device entered boxed state while "
357 "being set offline\n", dev_name(&cdev
->dev
));
358 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
359 pr_warning("%s: The device stopped operating while "
360 "being set offline\n", dev_name(&cdev
->dev
));
362 /* Give up reference from ccw_device_set_online(). */
363 put_device(&cdev
->dev
);
367 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
368 ret
, cdev
->private->dev_id
.ssid
,
369 cdev
->private->dev_id
.devno
);
370 cdev
->private->state
= DEV_STATE_OFFLINE
;
371 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
372 spin_unlock_irq(cdev
->ccwlock
);
373 /* Give up reference from ccw_device_set_online(). */
374 put_device(&cdev
->dev
);
379 * ccw_device_set_online() - enable a ccw device for I/O
380 * @cdev: target ccw device
382 * This function first enables @cdev and then calls the driver's set_online()
383 * function for @cdev, if given. If set_online() returns an error, @cdev is
386 * %0 on success and a negative error value on failure.
388 * enabled, ccw device lock not held
390 int ccw_device_set_online(struct ccw_device
*cdev
)
397 if (cdev
->online
|| !cdev
->drv
)
399 /* Hold on to an extra reference while device is online. */
400 if (!get_device(&cdev
->dev
))
403 spin_lock_irq(cdev
->ccwlock
);
404 ret
= ccw_device_online(cdev
);
405 spin_unlock_irq(cdev
->ccwlock
);
407 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
409 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
410 "device 0.%x.%04x\n",
411 ret
, cdev
->private->dev_id
.ssid
,
412 cdev
->private->dev_id
.devno
);
413 /* Give up online reference since onlining failed. */
414 put_device(&cdev
->dev
);
417 spin_lock_irq(cdev
->ccwlock
);
418 /* Check if online processing was successful */
419 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
420 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
421 spin_unlock_irq(cdev
->ccwlock
);
422 /* Inform the user that set online failed. */
423 if (cdev
->private->state
== DEV_STATE_BOXED
) {
424 pr_warning("%s: Setting the device online failed "
425 "because it is boxed\n",
426 dev_name(&cdev
->dev
));
427 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
428 pr_warning("%s: Setting the device online failed "
429 "because it is not operational\n",
430 dev_name(&cdev
->dev
));
432 /* Give up online reference since onlining failed. */
433 put_device(&cdev
->dev
);
436 spin_unlock_irq(cdev
->ccwlock
);
437 if (cdev
->drv
->set_online
)
438 ret
= cdev
->drv
->set_online(cdev
);
445 spin_lock_irq(cdev
->ccwlock
);
446 /* Wait until a final state or DISCONNECTED is reached */
447 while (!dev_fsm_final_state(cdev
) &&
448 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
449 spin_unlock_irq(cdev
->ccwlock
);
450 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
451 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
452 spin_lock_irq(cdev
->ccwlock
);
454 ret2
= ccw_device_offline(cdev
);
457 spin_unlock_irq(cdev
->ccwlock
);
458 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
459 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
460 /* Give up online reference since onlining failed. */
461 put_device(&cdev
->dev
);
465 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
466 "device 0.%x.%04x\n",
467 ret2
, cdev
->private->dev_id
.ssid
,
468 cdev
->private->dev_id
.devno
);
469 cdev
->private->state
= DEV_STATE_OFFLINE
;
470 spin_unlock_irq(cdev
->ccwlock
);
471 /* Give up online reference since onlining failed. */
472 put_device(&cdev
->dev
);
476 static int online_store_handle_offline(struct ccw_device
*cdev
)
478 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
) {
479 spin_lock_irq(cdev
->ccwlock
);
480 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
481 spin_unlock_irq(cdev
->ccwlock
);
482 } else if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->set_offline
)
483 return ccw_device_set_offline(cdev
);
487 static int online_store_recog_and_online(struct ccw_device
*cdev
)
489 /* Do device recognition, if needed. */
490 if (cdev
->private->state
== DEV_STATE_BOXED
) {
491 spin_lock_irq(cdev
->ccwlock
);
492 ccw_device_recognition(cdev
);
493 spin_unlock_irq(cdev
->ccwlock
);
494 wait_event(cdev
->private->wait_q
,
495 cdev
->private->flags
.recog_done
);
496 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
497 /* recognition failed */
500 if (cdev
->drv
&& cdev
->drv
->set_online
)
501 ccw_device_set_online(cdev
);
505 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
509 ret
= online_store_recog_and_online(cdev
);
512 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
513 ret
= ccw_device_stlck(cdev
);
516 if (cdev
->id
.cu_type
== 0)
517 cdev
->private->state
= DEV_STATE_NOT_OPER
;
518 ret
= online_store_recog_and_online(cdev
);
525 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
526 const char *buf
, size_t count
)
528 struct ccw_device
*cdev
= to_ccwdev(dev
);
532 if (!dev_fsm_final_state(cdev
) &&
533 cdev
->private->state
!= DEV_STATE_DISCONNECTED
)
535 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
538 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
539 atomic_set(&cdev
->private->onoff
, 0);
542 if (!strncmp(buf
, "force\n", count
)) {
548 ret
= strict_strtoul(buf
, 16, &i
);
554 ret
= online_store_handle_offline(cdev
);
557 ret
= online_store_handle_online(cdev
, force
);
564 module_put(cdev
->drv
->owner
);
565 atomic_set(&cdev
->private->onoff
, 0);
566 return (ret
< 0) ? ret
: count
;
570 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
572 struct ccw_device
*cdev
= to_ccwdev(dev
);
573 struct subchannel
*sch
;
575 if (ccw_device_is_orphan(cdev
))
576 return sprintf(buf
, "no device\n");
577 switch (cdev
->private->state
) {
578 case DEV_STATE_BOXED
:
579 return sprintf(buf
, "boxed\n");
580 case DEV_STATE_DISCONNECTED
:
581 case DEV_STATE_DISCONNECTED_SENSE_ID
:
582 case DEV_STATE_NOT_OPER
:
583 sch
= to_subchannel(dev
->parent
);
585 return sprintf(buf
, "no path\n");
587 return sprintf(buf
, "no device\n");
589 /* All other states considered fine. */
590 return sprintf(buf
, "good\n");
594 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
595 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
596 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
597 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
598 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
599 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
600 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
602 static struct attribute
*io_subchannel_attrs
[] = {
603 &dev_attr_chpids
.attr
,
604 &dev_attr_pimpampom
.attr
,
608 static struct attribute_group io_subchannel_attr_group
= {
609 .attrs
= io_subchannel_attrs
,
612 static struct attribute
* ccwdev_attrs
[] = {
613 &dev_attr_devtype
.attr
,
614 &dev_attr_cutype
.attr
,
615 &dev_attr_modalias
.attr
,
616 &dev_attr_online
.attr
,
617 &dev_attr_cmb_enable
.attr
,
618 &dev_attr_availability
.attr
,
622 static struct attribute_group ccwdev_attr_group
= {
623 .attrs
= ccwdev_attrs
,
626 static const struct attribute_group
*ccwdev_attr_groups
[] = {
631 /* this is a simple abstraction for device_register that sets the
632 * correct bus type and adds the bus specific files */
633 static int ccw_device_register(struct ccw_device
*cdev
)
635 struct device
*dev
= &cdev
->dev
;
638 dev
->bus
= &ccw_bus_type
;
639 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
640 cdev
->private->dev_id
.devno
);
643 ret
= device_add(dev
);
647 set_bit(1, &cdev
->private->registered
);
651 static int match_dev_id(struct device
*dev
, void *data
)
653 struct ccw_device
*cdev
= to_ccwdev(dev
);
654 struct ccw_dev_id
*dev_id
= data
;
656 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
659 static struct ccw_device
*get_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
)
663 dev
= bus_find_device(&ccw_bus_type
, NULL
, dev_id
, match_dev_id
);
665 return dev
? to_ccwdev(dev
) : NULL
;
668 static void ccw_device_do_unbind_bind(struct ccw_device
*cdev
)
672 if (test_bit(1, &cdev
->private->registered
)) {
673 device_release_driver(&cdev
->dev
);
674 ret
= device_attach(&cdev
->dev
);
675 WARN_ON(ret
== -ENODEV
);
680 ccw_device_release(struct device
*dev
)
682 struct ccw_device
*cdev
;
684 cdev
= to_ccwdev(dev
);
685 /* Release reference of parent subchannel. */
686 put_device(cdev
->dev
.parent
);
687 kfree(cdev
->private);
691 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
693 struct ccw_device
*cdev
;
695 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
697 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
698 GFP_KERNEL
| GFP_DMA
);
703 return ERR_PTR(-ENOMEM
);
706 static void ccw_device_todo(struct work_struct
*work
);
708 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
709 struct ccw_device
*cdev
)
711 cdev
->private->cdev
= cdev
;
712 atomic_set(&cdev
->private->onoff
, 0);
713 cdev
->dev
.parent
= &sch
->dev
;
714 cdev
->dev
.release
= ccw_device_release
;
715 INIT_WORK(&cdev
->private->todo_work
, ccw_device_todo
);
716 cdev
->dev
.groups
= ccwdev_attr_groups
;
717 /* Do first half of device_register. */
718 device_initialize(&cdev
->dev
);
719 if (!get_device(&sch
->dev
)) {
720 /* Release reference from device_initialize(). */
721 put_device(&cdev
->dev
);
727 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
729 struct ccw_device
*cdev
;
732 cdev
= io_subchannel_allocate_dev(sch
);
734 ret
= io_subchannel_initialize_dev(sch
, cdev
);
741 static void io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
743 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
745 struct ccw_device
*cdev
;
747 /* Need to allocate a new ccw device. */
748 cdev
= io_subchannel_create_ccwdev(sch
);
750 /* OK, we did everything we could... */
751 css_sch_device_unregister(sch
);
754 /* Start recognition for the new ccw device. */
755 io_subchannel_recog(cdev
, sch
);
759 * Register recognized device.
761 static void io_subchannel_register(struct ccw_device
*cdev
)
763 struct subchannel
*sch
;
767 sch
= to_subchannel(cdev
->dev
.parent
);
769 * Check if subchannel is still registered. It may have become
770 * unregistered if a machine check hit us after finishing
771 * device recognition but before the register work could be
774 if (!device_is_registered(&sch
->dev
))
776 css_update_ssd_info(sch
);
778 * io_subchannel_register() will also be called after device
779 * recognition has been done for a boxed device (which will already
780 * be registered). We need to reprobe since we may now have sense id
783 if (device_is_registered(&cdev
->dev
)) {
785 ret
= device_reprobe(&cdev
->dev
);
787 /* We can't do much here. */
788 CIO_MSG_EVENT(0, "device_reprobe() returned"
789 " %d for 0.%x.%04x\n", ret
,
790 cdev
->private->dev_id
.ssid
,
791 cdev
->private->dev_id
.devno
);
796 * Now we know this subchannel will stay, we can throw
797 * our delayed uevent.
799 dev_set_uevent_suppress(&sch
->dev
, 0);
800 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
801 /* make it known to the system */
802 ret
= ccw_device_register(cdev
);
804 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
805 cdev
->private->dev_id
.ssid
,
806 cdev
->private->dev_id
.devno
, ret
);
807 spin_lock_irqsave(sch
->lock
, flags
);
808 sch_set_cdev(sch
, NULL
);
809 spin_unlock_irqrestore(sch
->lock
, flags
);
810 /* Release initial device reference. */
811 put_device(&cdev
->dev
);
815 cdev
->private->flags
.recog_done
= 1;
816 wake_up(&cdev
->private->wait_q
);
818 if (atomic_dec_and_test(&ccw_device_init_count
))
819 wake_up(&ccw_device_init_wq
);
822 static void ccw_device_call_sch_unregister(struct ccw_device
*cdev
)
824 struct subchannel
*sch
;
826 /* Get subchannel reference for local processing. */
827 if (!get_device(cdev
->dev
.parent
))
829 sch
= to_subchannel(cdev
->dev
.parent
);
830 css_sch_device_unregister(sch
);
831 /* Release subchannel reference for local processing. */
832 put_device(&sch
->dev
);
836 * subchannel recognition done. Called from the state machine.
839 io_subchannel_recog_done(struct ccw_device
*cdev
)
841 if (css_init_done
== 0) {
842 cdev
->private->flags
.recog_done
= 1;
845 switch (cdev
->private->state
) {
846 case DEV_STATE_BOXED
:
847 /* Device did not respond in time. */
848 case DEV_STATE_NOT_OPER
:
849 cdev
->private->flags
.recog_done
= 1;
850 /* Remove device found not operational. */
851 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
852 if (atomic_dec_and_test(&ccw_device_init_count
))
853 wake_up(&ccw_device_init_wq
);
855 case DEV_STATE_OFFLINE
:
857 * We can't register the device in interrupt context so
858 * we schedule a work item.
860 ccw_device_sched_todo(cdev
, CDEV_TODO_REGISTER
);
865 static void io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
867 struct ccw_device_private
*priv
;
869 cdev
->ccwlock
= sch
->lock
;
871 /* Init private data. */
872 priv
= cdev
->private;
873 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
874 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
875 priv
->schid
= sch
->schid
;
876 priv
->state
= DEV_STATE_NOT_OPER
;
877 INIT_LIST_HEAD(&priv
->cmb_list
);
878 init_waitqueue_head(&priv
->wait_q
);
879 init_timer(&priv
->timer
);
881 /* Increase counter of devices currently in recognition. */
882 atomic_inc(&ccw_device_init_count
);
884 /* Start async. device sensing. */
885 spin_lock_irq(sch
->lock
);
886 sch_set_cdev(sch
, cdev
);
887 ccw_device_recognition(cdev
);
888 spin_unlock_irq(sch
->lock
);
891 static int ccw_device_move_to_sch(struct ccw_device
*cdev
,
892 struct subchannel
*sch
)
894 struct subchannel
*old_sch
;
897 old_sch
= to_subchannel(cdev
->dev
.parent
);
898 /* Obtain child reference for new parent. */
899 if (!get_device(&sch
->dev
))
901 mutex_lock(&sch
->reg_mutex
);
902 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
903 mutex_unlock(&sch
->reg_mutex
);
905 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
906 cdev
->private->dev_id
.ssid
,
907 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
908 sch
->schib
.pmcw
.dev
, rc
);
909 /* Release child reference for new parent. */
910 put_device(&sch
->dev
);
913 /* Clean up old subchannel. */
914 if (!sch_is_pseudo_sch(old_sch
)) {
915 spin_lock_irq(old_sch
->lock
);
916 sch_set_cdev(old_sch
, NULL
);
917 cio_disable_subchannel(old_sch
);
918 spin_unlock_irq(old_sch
->lock
);
919 css_schedule_eval(old_sch
->schid
);
921 /* Release child reference for old parent. */
922 put_device(&old_sch
->dev
);
923 /* Initialize new subchannel. */
924 spin_lock_irq(sch
->lock
);
925 cdev
->private->schid
= sch
->schid
;
926 cdev
->ccwlock
= sch
->lock
;
927 if (!sch_is_pseudo_sch(sch
))
928 sch_set_cdev(sch
, cdev
);
929 spin_unlock_irq(sch
->lock
);
930 if (!sch_is_pseudo_sch(sch
))
931 css_update_ssd_info(sch
);
935 static int ccw_device_move_to_orph(struct ccw_device
*cdev
)
937 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
938 struct channel_subsystem
*css
= to_css(sch
->dev
.parent
);
940 return ccw_device_move_to_sch(cdev
, css
->pseudo_subchannel
);
943 static void io_subchannel_irq(struct subchannel
*sch
)
945 struct ccw_device
*cdev
;
947 cdev
= sch_get_cdev(sch
);
949 CIO_TRACE_EVENT(6, "IRQ");
950 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
952 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
955 void io_subchannel_init_config(struct subchannel
*sch
)
957 memset(&sch
->config
, 0, sizeof(sch
->config
));
958 sch
->config
.csense
= 1;
961 static void io_subchannel_init_fields(struct subchannel
*sch
)
963 if (cio_is_console(sch
->schid
))
966 sch
->opm
= chp_get_sch_opm(sch
);
967 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
968 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
970 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
971 " - PIM = %02X, PAM = %02X, POM = %02X\n",
972 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
973 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
974 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
976 io_subchannel_init_config(sch
);
980 * Note: We always return 0 so that we bind to the device even on error.
981 * This is needed so that our remove function is called on unregister.
983 static int io_subchannel_probe(struct subchannel
*sch
)
985 struct ccw_device
*cdev
;
988 if (cio_is_console(sch
->schid
)) {
989 rc
= sysfs_create_group(&sch
->dev
.kobj
,
990 &io_subchannel_attr_group
);
992 CIO_MSG_EVENT(0, "Failed to create io subchannel "
993 "attributes for subchannel "
994 "0.%x.%04x (rc=%d)\n",
995 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
997 * The console subchannel already has an associated ccw_device.
998 * Throw the delayed uevent for the subchannel, register
999 * the ccw_device and exit.
1001 dev_set_uevent_suppress(&sch
->dev
, 0);
1002 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1003 cdev
= sch_get_cdev(sch
);
1004 cdev
->dev
.groups
= ccwdev_attr_groups
;
1005 device_initialize(&cdev
->dev
);
1006 ccw_device_register(cdev
);
1008 * Check if the device is already online. If it is
1009 * the reference count needs to be corrected since we
1010 * didn't obtain a reference in ccw_device_set_online.
1012 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1013 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1014 cdev
->private->state
!= DEV_STATE_BOXED
)
1015 get_device(&cdev
->dev
);
1018 io_subchannel_init_fields(sch
);
1019 rc
= cio_commit_config(sch
);
1022 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1023 &io_subchannel_attr_group
);
1026 /* Allocate I/O subchannel private data. */
1027 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1028 GFP_KERNEL
| GFP_DMA
);
1031 css_schedule_eval(sch
->schid
);
1035 spin_lock_irq(sch
->lock
);
1036 css_sched_sch_todo(sch
, SCH_TODO_UNREG
);
1037 spin_unlock_irq(sch
->lock
);
1042 io_subchannel_remove (struct subchannel
*sch
)
1044 struct ccw_device
*cdev
;
1045 unsigned long flags
;
1047 cdev
= sch_get_cdev(sch
);
1050 /* Set ccw device to not operational and drop reference. */
1051 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1052 sch_set_cdev(sch
, NULL
);
1053 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1054 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1055 ccw_device_unregister(cdev
);
1057 kfree(sch
->private);
1058 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1062 static void io_subchannel_verify(struct subchannel
*sch
)
1064 struct ccw_device
*cdev
;
1066 cdev
= sch_get_cdev(sch
);
1068 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1071 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1073 struct ccw_device
*cdev
;
1075 cdev
= sch_get_cdev(sch
);
1078 if (cio_update_schib(sch
))
1080 /* Check for I/O on path. */
1081 if (scsw_actl(&sch
->schib
.scsw
) == 0 || sch
->schib
.pmcw
.lpum
!= mask
)
1083 if (cdev
->private->state
== DEV_STATE_ONLINE
) {
1084 ccw_device_kill_io(cdev
);
1090 /* Trigger path verification. */
1091 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1095 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1098 static int io_subchannel_chp_event(struct subchannel
*sch
,
1099 struct chp_link
*link
, int event
)
1103 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1110 io_subchannel_terminate_path(sch
, mask
);
1115 io_subchannel_verify(sch
);
1118 if (cio_update_schib(sch
))
1120 io_subchannel_terminate_path(sch
, mask
);
1123 if (cio_update_schib(sch
))
1125 sch
->lpm
|= mask
& sch
->opm
;
1126 io_subchannel_verify(sch
);
1133 io_subchannel_shutdown(struct subchannel
*sch
)
1135 struct ccw_device
*cdev
;
1138 cdev
= sch_get_cdev(sch
);
1140 if (cio_is_console(sch
->schid
))
1142 if (!sch
->schib
.pmcw
.ena
)
1143 /* Nothing to do. */
1145 ret
= cio_disable_subchannel(sch
);
1147 /* Subchannel is disabled, we're done. */
1149 cdev
->private->state
= DEV_STATE_QUIESCE
;
1151 cdev
->handler(cdev
, cdev
->private->intparm
,
1153 ret
= ccw_device_cancel_halt_clear(cdev
);
1154 if (ret
== -EBUSY
) {
1155 ccw_device_set_timeout(cdev
, HZ
/10);
1156 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1158 cio_disable_subchannel(sch
);
1161 static int device_is_disconnected(struct ccw_device
*cdev
)
1165 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1166 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1169 static int recovery_check(struct device
*dev
, void *data
)
1171 struct ccw_device
*cdev
= to_ccwdev(dev
);
1174 spin_lock_irq(cdev
->ccwlock
);
1175 switch (cdev
->private->state
) {
1176 case DEV_STATE_DISCONNECTED
:
1177 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1178 cdev
->private->dev_id
.ssid
,
1179 cdev
->private->dev_id
.devno
);
1180 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1183 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1187 spin_unlock_irq(cdev
->ccwlock
);
1192 static void recovery_work_func(struct work_struct
*unused
)
1196 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1198 spin_lock_irq(&recovery_lock
);
1199 if (!timer_pending(&recovery_timer
)) {
1200 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1202 mod_timer(&recovery_timer
, jiffies
+
1203 recovery_delay
[recovery_phase
] * HZ
);
1205 spin_unlock_irq(&recovery_lock
);
1207 CIO_MSG_EVENT(4, "recovery: end\n");
1210 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1212 static void recovery_func(unsigned long data
)
1215 * We can't do our recovery in softirq context and it's not
1216 * performance critical, so we schedule it.
1218 schedule_work(&recovery_work
);
1221 static void ccw_device_schedule_recovery(void)
1223 unsigned long flags
;
1225 CIO_MSG_EVENT(4, "recovery: schedule\n");
1226 spin_lock_irqsave(&recovery_lock
, flags
);
1227 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1229 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1231 spin_unlock_irqrestore(&recovery_lock
, flags
);
1234 static int purge_fn(struct device
*dev
, void *data
)
1236 struct ccw_device
*cdev
= to_ccwdev(dev
);
1237 struct ccw_dev_id
*id
= &cdev
->private->dev_id
;
1239 spin_lock_irq(cdev
->ccwlock
);
1240 if (is_blacklisted(id
->ssid
, id
->devno
) &&
1241 (cdev
->private->state
== DEV_STATE_OFFLINE
)) {
1242 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id
->ssid
,
1244 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1246 spin_unlock_irq(cdev
->ccwlock
);
1247 /* Abort loop in case of pending signal. */
1248 if (signal_pending(current
))
1255 * ccw_purge_blacklisted - purge unused, blacklisted devices
1257 * Unregister all ccw devices that are offline and on the blacklist.
1259 int ccw_purge_blacklisted(void)
1261 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1262 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1266 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1270 ccw_device_set_timeout(cdev
, 0);
1271 cdev
->private->flags
.fake_irb
= 0;
1272 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1274 ccw_device_schedule_recovery();
1277 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1279 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1281 CIO_TRACE_EVENT(2, "notoper");
1282 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1283 ccw_device_set_timeout(cdev
, 0);
1284 cio_disable_subchannel(sch
);
1285 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1288 enum io_sch_action
{
1292 IO_SCH_UNREG_ATTACH
,
1300 static enum io_sch_action
sch_get_action(struct subchannel
*sch
)
1302 struct ccw_device
*cdev
;
1304 cdev
= sch_get_cdev(sch
);
1305 if (cio_update_schib(sch
)) {
1306 /* Not operational. */
1308 return IO_SCH_UNREG
;
1309 if (!ccw_device_notify(cdev
, CIO_GONE
))
1310 return IO_SCH_UNREG
;
1311 return IO_SCH_ORPH_UNREG
;
1315 return IO_SCH_ATTACH
;
1316 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1317 if (!ccw_device_notify(cdev
, CIO_GONE
))
1318 return IO_SCH_UNREG_ATTACH
;
1319 return IO_SCH_ORPH_ATTACH
;
1321 if ((sch
->schib
.pmcw
.pam
& sch
->opm
) == 0) {
1322 if (!ccw_device_notify(cdev
, CIO_NO_PATH
))
1323 return IO_SCH_UNREG
;
1326 if (device_is_disconnected(cdev
))
1327 return IO_SCH_REPROBE
;
1329 return IO_SCH_VERIFY
;
1334 * io_subchannel_sch_event - process subchannel event
1336 * @process: non-zero if function is called in process context
1338 * An unspecified event occurred for this subchannel. Adjust data according
1339 * to the current operational state of the subchannel and device. Return
1340 * zero when the event has been handled sufficiently or -EAGAIN when this
1341 * function should be called again in process context.
1343 static int io_subchannel_sch_event(struct subchannel
*sch
, int process
)
1345 unsigned long flags
;
1346 struct ccw_device
*cdev
;
1347 struct ccw_dev_id dev_id
;
1348 enum io_sch_action action
;
1351 spin_lock_irqsave(sch
->lock
, flags
);
1352 if (!device_is_registered(&sch
->dev
))
1354 if (work_pending(&sch
->todo_work
))
1356 cdev
= sch_get_cdev(sch
);
1357 if (cdev
&& work_pending(&cdev
->private->todo_work
))
1359 action
= sch_get_action(sch
);
1360 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1361 sch
->schid
.ssid
, sch
->schid
.sch_no
, process
,
1363 /* Perform immediate actions while holding the lock. */
1365 case IO_SCH_REPROBE
:
1366 /* Trigger device recognition. */
1367 ccw_device_trigger_reprobe(cdev
);
1371 /* Trigger path verification. */
1372 io_subchannel_verify(sch
);
1376 ccw_device_set_disconnected(cdev
);
1379 case IO_SCH_ORPH_UNREG
:
1380 case IO_SCH_ORPH_ATTACH
:
1381 ccw_device_set_disconnected(cdev
);
1383 case IO_SCH_UNREG_ATTACH
:
1386 ccw_device_set_notoper(cdev
);
1394 spin_unlock_irqrestore(sch
->lock
, flags
);
1395 /* All other actions require process context. */
1398 /* Handle attached ccw device. */
1400 case IO_SCH_ORPH_UNREG
:
1401 case IO_SCH_ORPH_ATTACH
:
1402 /* Move ccw device to orphanage. */
1403 rc
= ccw_device_move_to_orph(cdev
);
1407 case IO_SCH_UNREG_ATTACH
:
1408 /* Unregister ccw device. */
1409 ccw_device_unregister(cdev
);
1414 /* Handle subchannel. */
1416 case IO_SCH_ORPH_UNREG
:
1418 css_sch_device_unregister(sch
);
1420 case IO_SCH_ORPH_ATTACH
:
1421 case IO_SCH_UNREG_ATTACH
:
1423 dev_id
.ssid
= sch
->schid
.ssid
;
1424 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1425 cdev
= get_ccwdev_by_dev_id(&dev_id
);
1427 sch_create_and_recog_new_device(sch
);
1430 rc
= ccw_device_move_to_sch(cdev
, sch
);
1432 /* Release reference from get_ccwdev_by_dev_id() */
1433 put_device(&cdev
->dev
);
1436 spin_lock_irqsave(sch
->lock
, flags
);
1437 ccw_device_trigger_reprobe(cdev
);
1438 spin_unlock_irqrestore(sch
->lock
, flags
);
1439 /* Release reference from get_ccwdev_by_dev_id() */
1440 put_device(&cdev
->dev
);
1448 spin_unlock_irqrestore(sch
->lock
, flags
);
1453 #ifdef CONFIG_CCW_CONSOLE
1454 static struct ccw_device console_cdev
;
1455 static struct ccw_device_private console_private
;
1456 static int console_cdev_in_use
;
1458 static DEFINE_SPINLOCK(ccw_console_lock
);
1460 spinlock_t
* cio_get_console_lock(void)
1462 return &ccw_console_lock
;
1465 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1466 struct subchannel
*sch
)
1470 /* Attach subchannel private data. */
1471 sch
->private = cio_get_console_priv();
1472 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1473 io_subchannel_init_fields(sch
);
1474 rc
= cio_commit_config(sch
);
1477 sch
->driver
= &io_subchannel_driver
;
1478 /* Initialize the ccw_device structure. */
1479 cdev
->dev
.parent
= &sch
->dev
;
1480 io_subchannel_recog(cdev
, sch
);
1481 /* Now wait for the async. recognition to come to an end. */
1482 spin_lock_irq(cdev
->ccwlock
);
1483 while (!dev_fsm_final_state(cdev
))
1486 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1488 ccw_device_online(cdev
);
1489 while (!dev_fsm_final_state(cdev
))
1491 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1495 spin_unlock_irq(cdev
->ccwlock
);
1500 ccw_device_probe_console(void)
1502 struct subchannel
*sch
;
1505 if (xchg(&console_cdev_in_use
, 1) != 0)
1506 return ERR_PTR(-EBUSY
);
1507 sch
= cio_probe_console();
1509 console_cdev_in_use
= 0;
1510 return (void *) sch
;
1512 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1513 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1514 console_cdev
.private = &console_private
;
1515 console_private
.cdev
= &console_cdev
;
1516 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1518 cio_release_console();
1519 console_cdev_in_use
= 0;
1520 return ERR_PTR(ret
);
1522 console_cdev
.online
= 1;
1523 return &console_cdev
;
1526 static int ccw_device_pm_restore(struct device
*dev
);
1528 int ccw_device_force_console(void)
1530 if (!console_cdev_in_use
)
1532 return ccw_device_pm_restore(&console_cdev
.dev
);
1534 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1538 * get ccw_device matching the busid, but only if owned by cdrv
1541 __ccwdev_check_busid(struct device
*dev
, void *id
)
1547 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1552 * get_ccwdev_by_busid() - obtain device from a bus id
1553 * @cdrv: driver the device is owned by
1554 * @bus_id: bus id of the device to be searched
1556 * This function searches all devices owned by @cdrv for a device with a bus
1557 * id matching @bus_id.
1559 * If a match is found, its reference count of the found device is increased
1560 * and it is returned; else %NULL is returned.
1562 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1566 struct device_driver
*drv
;
1568 drv
= get_driver(&cdrv
->driver
);
1572 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1573 __ccwdev_check_busid
);
1576 return dev
? to_ccwdev(dev
) : NULL
;
1579 /************************** device driver handling ************************/
1581 /* This is the implementation of the ccw_driver class. The probe, remove
1582 * and release methods are initially very similar to the device_driver
1583 * implementations, with the difference that they have ccw_device
1586 * A ccw driver also contains the information that is needed for
1590 ccw_device_probe (struct device
*dev
)
1592 struct ccw_device
*cdev
= to_ccwdev(dev
);
1593 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1596 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1598 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1609 ccw_device_remove (struct device
*dev
)
1611 struct ccw_device
*cdev
= to_ccwdev(dev
);
1612 struct ccw_driver
*cdrv
= cdev
->drv
;
1619 spin_lock_irq(cdev
->ccwlock
);
1620 ret
= ccw_device_offline(cdev
);
1621 spin_unlock_irq(cdev
->ccwlock
);
1623 wait_event(cdev
->private->wait_q
,
1624 dev_fsm_final_state(cdev
));
1626 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1627 "device 0.%x.%04x\n",
1628 ret
, cdev
->private->dev_id
.ssid
,
1629 cdev
->private->dev_id
.devno
);
1630 /* Give up reference obtained in ccw_device_set_online(). */
1631 put_device(&cdev
->dev
);
1633 ccw_device_set_timeout(cdev
, 0);
1638 static void ccw_device_shutdown(struct device
*dev
)
1640 struct ccw_device
*cdev
;
1642 cdev
= to_ccwdev(dev
);
1643 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1644 cdev
->drv
->shutdown(cdev
);
1648 static int ccw_device_pm_prepare(struct device
*dev
)
1650 struct ccw_device
*cdev
= to_ccwdev(dev
);
1652 if (work_pending(&cdev
->private->todo_work
))
1654 /* Fail while device is being set online/offline. */
1655 if (atomic_read(&cdev
->private->onoff
))
1658 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1659 return cdev
->drv
->prepare(cdev
);
1664 static void ccw_device_pm_complete(struct device
*dev
)
1666 struct ccw_device
*cdev
= to_ccwdev(dev
);
1668 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1669 cdev
->drv
->complete(cdev
);
1672 static int ccw_device_pm_freeze(struct device
*dev
)
1674 struct ccw_device
*cdev
= to_ccwdev(dev
);
1675 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1676 int ret
, cm_enabled
;
1678 /* Fail suspend while device is in transistional state. */
1679 if (!dev_fsm_final_state(cdev
))
1683 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1684 ret
= cdev
->drv
->freeze(cdev
);
1689 spin_lock_irq(sch
->lock
);
1690 cm_enabled
= cdev
->private->cmb
!= NULL
;
1691 spin_unlock_irq(sch
->lock
);
1693 /* Don't have the css write on memory. */
1694 ret
= ccw_set_cmf(cdev
, 0);
1698 /* From here on, disallow device driver I/O. */
1699 spin_lock_irq(sch
->lock
);
1700 ret
= cio_disable_subchannel(sch
);
1701 spin_unlock_irq(sch
->lock
);
1706 static int ccw_device_pm_thaw(struct device
*dev
)
1708 struct ccw_device
*cdev
= to_ccwdev(dev
);
1709 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1710 int ret
, cm_enabled
;
1715 spin_lock_irq(sch
->lock
);
1716 /* Allow device driver I/O again. */
1717 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1718 cm_enabled
= cdev
->private->cmb
!= NULL
;
1719 spin_unlock_irq(sch
->lock
);
1724 ret
= ccw_set_cmf(cdev
, 1);
1729 if (cdev
->drv
&& cdev
->drv
->thaw
)
1730 ret
= cdev
->drv
->thaw(cdev
);
1735 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
1737 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1739 if (cio_is_console(sch
->schid
))
1742 * While we were sleeping, devices may have gone or become
1743 * available again. Kick re-detection.
1745 spin_lock_irq(sch
->lock
);
1746 cdev
->private->flags
.resuming
= 1;
1747 ccw_device_recognition(cdev
);
1748 spin_unlock_irq(sch
->lock
);
1749 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
1750 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
1752 cdev
->private->flags
.resuming
= 0;
1755 static int resume_handle_boxed(struct ccw_device
*cdev
)
1757 cdev
->private->state
= DEV_STATE_BOXED
;
1758 if (ccw_device_notify(cdev
, CIO_BOXED
))
1760 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1764 static int resume_handle_disc(struct ccw_device
*cdev
)
1766 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1767 if (ccw_device_notify(cdev
, CIO_GONE
))
1769 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1773 static int ccw_device_pm_restore(struct device
*dev
)
1775 struct ccw_device
*cdev
= to_ccwdev(dev
);
1776 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1777 int ret
= 0, cm_enabled
;
1779 __ccw_device_pm_restore(cdev
);
1780 spin_lock_irq(sch
->lock
);
1781 if (cio_is_console(sch
->schid
)) {
1782 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1783 spin_unlock_irq(sch
->lock
);
1786 cdev
->private->flags
.donotify
= 0;
1787 /* check recognition results */
1788 switch (cdev
->private->state
) {
1789 case DEV_STATE_OFFLINE
:
1791 case DEV_STATE_BOXED
:
1792 ret
= resume_handle_boxed(cdev
);
1793 spin_unlock_irq(sch
->lock
);
1797 case DEV_STATE_DISCONNECTED
:
1798 goto out_disc_unlock
;
1800 goto out_unreg_unlock
;
1802 /* check if the device id has changed */
1803 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1804 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
1805 "changed from %04x to %04x)\n",
1806 sch
->schid
.ssid
, sch
->schid
.sch_no
,
1807 cdev
->private->dev_id
.devno
,
1808 sch
->schib
.pmcw
.dev
);
1809 goto out_unreg_unlock
;
1811 /* check if the device type has changed */
1812 if (!ccw_device_test_sense_data(cdev
)) {
1813 ccw_device_update_sense_data(cdev
);
1814 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
1818 if (!cdev
->online
) {
1822 ret
= ccw_device_online(cdev
);
1824 goto out_disc_unlock
;
1826 cm_enabled
= cdev
->private->cmb
!= NULL
;
1827 spin_unlock_irq(sch
->lock
);
1829 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1830 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
1831 spin_lock_irq(sch
->lock
);
1832 goto out_disc_unlock
;
1835 ret
= ccw_set_cmf(cdev
, 1);
1837 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1838 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
1839 cdev
->private->dev_id
.devno
, ret
);
1845 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
1846 ret
= cdev
->drv
->restore(cdev
);
1851 ret
= resume_handle_disc(cdev
);
1852 spin_unlock_irq(sch
->lock
);
1858 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
1861 spin_unlock_irq(sch
->lock
);
1865 static struct dev_pm_ops ccw_pm_ops
= {
1866 .prepare
= ccw_device_pm_prepare
,
1867 .complete
= ccw_device_pm_complete
,
1868 .freeze
= ccw_device_pm_freeze
,
1869 .thaw
= ccw_device_pm_thaw
,
1870 .restore
= ccw_device_pm_restore
,
1873 struct bus_type ccw_bus_type
= {
1875 .match
= ccw_bus_match
,
1876 .uevent
= ccw_uevent
,
1877 .probe
= ccw_device_probe
,
1878 .remove
= ccw_device_remove
,
1879 .shutdown
= ccw_device_shutdown
,
1884 * ccw_driver_register() - register a ccw driver
1885 * @cdriver: driver to be registered
1887 * This function is mainly a wrapper around driver_register().
1889 * %0 on success and a negative error value on failure.
1891 int ccw_driver_register(struct ccw_driver
*cdriver
)
1893 struct device_driver
*drv
= &cdriver
->driver
;
1895 drv
->bus
= &ccw_bus_type
;
1896 drv
->name
= cdriver
->name
;
1897 drv
->owner
= cdriver
->owner
;
1899 return driver_register(drv
);
1903 * ccw_driver_unregister() - deregister a ccw driver
1904 * @cdriver: driver to be deregistered
1906 * This function is mainly a wrapper around driver_unregister().
1908 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
1910 driver_unregister(&cdriver
->driver
);
1913 /* Helper func for qdio. */
1914 struct subchannel_id
1915 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1917 struct subchannel
*sch
;
1919 sch
= to_subchannel(cdev
->dev
.parent
);
1923 static void ccw_device_todo(struct work_struct
*work
)
1925 struct ccw_device_private
*priv
;
1926 struct ccw_device
*cdev
;
1927 struct subchannel
*sch
;
1928 enum cdev_todo todo
;
1930 priv
= container_of(work
, struct ccw_device_private
, todo_work
);
1932 sch
= to_subchannel(cdev
->dev
.parent
);
1933 /* Find out todo. */
1934 spin_lock_irq(cdev
->ccwlock
);
1936 priv
->todo
= CDEV_TODO_NOTHING
;
1937 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1938 priv
->dev_id
.ssid
, priv
->dev_id
.devno
, todo
);
1939 spin_unlock_irq(cdev
->ccwlock
);
1942 case CDEV_TODO_ENABLE_CMF
:
1945 case CDEV_TODO_REBIND
:
1946 ccw_device_do_unbind_bind(cdev
);
1948 case CDEV_TODO_REGISTER
:
1949 io_subchannel_register(cdev
);
1951 case CDEV_TODO_UNREG_EVAL
:
1952 if (!sch_is_pseudo_sch(sch
))
1953 css_schedule_eval(sch
->schid
);
1955 case CDEV_TODO_UNREG
:
1956 if (sch_is_pseudo_sch(sch
))
1957 ccw_device_unregister(cdev
);
1959 ccw_device_call_sch_unregister(cdev
);
1964 /* Release workqueue ref. */
1965 put_device(&cdev
->dev
);
1969 * ccw_device_sched_todo - schedule ccw device operation
1973 * Schedule the operation identified by @todo to be performed on the slow path
1974 * workqueue. Do nothing if another operation with higher priority is already
1975 * scheduled. Needs to be called with ccwdev lock held.
1977 void ccw_device_sched_todo(struct ccw_device
*cdev
, enum cdev_todo todo
)
1979 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
1980 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
1982 if (cdev
->private->todo
>= todo
)
1984 cdev
->private->todo
= todo
;
1985 /* Get workqueue ref. */
1986 if (!get_device(&cdev
->dev
))
1988 if (!queue_work(slow_path_wq
, &cdev
->private->todo_work
)) {
1989 /* Already queued, release workqueue ref. */
1990 put_device(&cdev
->dev
);
1994 MODULE_LICENSE("GPL");
1995 EXPORT_SYMBOL(ccw_device_set_online
);
1996 EXPORT_SYMBOL(ccw_device_set_offline
);
1997 EXPORT_SYMBOL(ccw_driver_register
);
1998 EXPORT_SYMBOL(ccw_driver_unregister
);
1999 EXPORT_SYMBOL(get_ccwdev_by_busid
);
2000 EXPORT_SYMBOL(ccw_bus_type
);
2001 EXPORT_SYMBOL(ccw_device_work
);
2002 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);