2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
5 * Copyright IBM Corp. 2002,2008
6 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/spinlock.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include <linux/list.h>
21 #include <linux/device.h>
22 #include <linux/workqueue.h>
23 #include <linux/timer.h>
25 #include <asm/ccwdev.h>
27 #include <asm/param.h> /* HZ */
33 #include "cio_debug.h"
38 #include "blacklist.h"
40 static struct timer_list recovery_timer
;
41 static DEFINE_SPINLOCK(recovery_lock
);
42 static int recovery_phase
;
43 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
45 /******************* bus type handling ***********************/
47 /* The Linux driver model distinguishes between a bus type and
48 * the bus itself. Of course we only have one channel
49 * subsystem driver and one channel system per machine, but
50 * we still use the abstraction. T.R. says it's a good idea. */
52 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
54 struct ccw_device
*cdev
= to_ccwdev(dev
);
55 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
56 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
61 found
= ccw_device_id_match(ids
, &cdev
->id
);
65 cdev
->id
.driver_info
= found
->driver_info
;
70 /* Store modalias string delimited by prefix/suffix string into buffer with
71 * specified size. Return length of resulting string (excluding trailing '\0')
72 * even if string doesn't fit buffer (snprintf semantics). */
73 static int snprint_alias(char *buf
, size_t size
,
74 struct ccw_device_id
*id
, const char *suffix
)
78 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
84 if (id
->dev_type
!= 0)
85 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
86 id
->dev_model
, suffix
);
88 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
93 /* Set up environment variables for ccw device uevent. Return 0 on success,
94 * non-zero otherwise. */
95 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
97 struct ccw_device
*cdev
= to_ccwdev(dev
);
98 struct ccw_device_id
*id
= &(cdev
->id
);
100 char modalias_buf
[30];
103 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
108 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
112 /* The next two can be zero, that's ok for us */
114 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
119 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
124 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
125 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
129 struct bus_type ccw_bus_type
;
131 static void io_subchannel_irq(struct subchannel
*);
132 static int io_subchannel_probe(struct subchannel
*);
133 static int io_subchannel_remove(struct subchannel
*);
134 static void io_subchannel_shutdown(struct subchannel
*);
135 static int io_subchannel_sch_event(struct subchannel
*, int);
136 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
138 static void recovery_func(unsigned long data
);
139 wait_queue_head_t ccw_device_init_wq
;
140 atomic_t ccw_device_init_count
;
142 static struct css_device_id io_subchannel_ids
[] = {
143 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
144 { /* end of list */ },
146 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
148 static int io_subchannel_prepare(struct subchannel
*sch
)
150 struct ccw_device
*cdev
;
152 * Don't allow suspend while a ccw device registration
153 * is still outstanding.
155 cdev
= sch_get_cdev(sch
);
156 if (cdev
&& !device_is_registered(&cdev
->dev
))
161 static void io_subchannel_settle(void)
163 wait_event(ccw_device_init_wq
,
164 atomic_read(&ccw_device_init_count
) == 0);
165 flush_workqueue(cio_work_q
);
168 static struct css_driver io_subchannel_driver
= {
169 .owner
= THIS_MODULE
,
170 .subchannel_type
= io_subchannel_ids
,
171 .name
= "io_subchannel",
172 .irq
= io_subchannel_irq
,
173 .sch_event
= io_subchannel_sch_event
,
174 .chp_event
= io_subchannel_chp_event
,
175 .probe
= io_subchannel_probe
,
176 .remove
= io_subchannel_remove
,
177 .shutdown
= io_subchannel_shutdown
,
178 .prepare
= io_subchannel_prepare
,
179 .settle
= io_subchannel_settle
,
182 int __init
io_subchannel_init(void)
186 init_waitqueue_head(&ccw_device_init_wq
);
187 atomic_set(&ccw_device_init_count
, 0);
188 setup_timer(&recovery_timer
, recovery_func
, 0);
190 ret
= bus_register(&ccw_bus_type
);
193 ret
= css_driver_register(&io_subchannel_driver
);
195 bus_unregister(&ccw_bus_type
);
201 /************************ device handling **************************/
204 * A ccw_device has some interfaces in sysfs in addition to the
206 * The following entries are designed to export the information which
207 * resided in 2.4 in /proc/subchannels. Subchannel and device number
208 * are obvious, so they don't have an entry :)
209 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
212 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
214 struct subchannel
*sch
= to_subchannel(dev
);
215 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
220 for (chp
= 0; chp
< 8; chp
++) {
222 if (ssd
->path_mask
& mask
)
223 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
225 ret
+= sprintf(buf
+ ret
, "00 ");
227 ret
+= sprintf (buf
+ret
, "\n");
228 return min((ssize_t
)PAGE_SIZE
, ret
);
232 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
234 struct subchannel
*sch
= to_subchannel(dev
);
235 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
237 return sprintf (buf
, "%02x %02x %02x\n",
238 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
242 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
244 struct ccw_device
*cdev
= to_ccwdev(dev
);
245 struct ccw_device_id
*id
= &(cdev
->id
);
247 if (id
->dev_type
!= 0)
248 return sprintf(buf
, "%04x/%02x\n",
249 id
->dev_type
, id
->dev_model
);
251 return sprintf(buf
, "n/a\n");
255 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
257 struct ccw_device
*cdev
= to_ccwdev(dev
);
258 struct ccw_device_id
*id
= &(cdev
->id
);
260 return sprintf(buf
, "%04x/%02x\n",
261 id
->cu_type
, id
->cu_model
);
265 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
267 struct ccw_device
*cdev
= to_ccwdev(dev
);
268 struct ccw_device_id
*id
= &(cdev
->id
);
271 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
273 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
277 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
279 struct ccw_device
*cdev
= to_ccwdev(dev
);
281 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
284 int ccw_device_is_orphan(struct ccw_device
*cdev
)
286 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
289 static void ccw_device_unregister(struct ccw_device
*cdev
)
291 if (device_is_registered(&cdev
->dev
)) {
292 /* Undo device_add(). */
293 device_del(&cdev
->dev
);
295 if (cdev
->private->flags
.initialized
) {
296 cdev
->private->flags
.initialized
= 0;
297 /* Release reference from device_initialize(). */
298 put_device(&cdev
->dev
);
302 static void io_subchannel_quiesce(struct subchannel
*);
305 * ccw_device_set_offline() - disable a ccw device for I/O
306 * @cdev: target ccw device
308 * This function calls the driver's set_offline() function for @cdev, if
309 * given, and then disables @cdev.
311 * %0 on success and a negative error value on failure.
313 * enabled, ccw device lock not held
315 int ccw_device_set_offline(struct ccw_device
*cdev
)
317 struct subchannel
*sch
;
322 if (!cdev
->online
|| !cdev
->drv
)
325 if (cdev
->drv
->set_offline
) {
326 ret
= cdev
->drv
->set_offline(cdev
);
331 spin_lock_irq(cdev
->ccwlock
);
332 sch
= to_subchannel(cdev
->dev
.parent
);
333 /* Wait until a final state or DISCONNECTED is reached */
334 while (!dev_fsm_final_state(cdev
) &&
335 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
336 spin_unlock_irq(cdev
->ccwlock
);
337 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
338 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
339 spin_lock_irq(cdev
->ccwlock
);
342 ret
= ccw_device_offline(cdev
);
345 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
346 "0.%x.%04x\n", ret
, cdev
->private->dev_id
.ssid
,
347 cdev
->private->dev_id
.devno
);
350 state
= cdev
->private->state
;
351 spin_unlock_irq(cdev
->ccwlock
);
352 io_subchannel_quiesce(sch
);
353 spin_lock_irq(cdev
->ccwlock
);
354 cdev
->private->state
= state
;
355 } while (ret
== -EBUSY
);
356 spin_unlock_irq(cdev
->ccwlock
);
357 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
358 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
359 /* Inform the user if set offline failed. */
360 if (cdev
->private->state
== DEV_STATE_BOXED
) {
361 pr_warning("%s: The device entered boxed state while "
362 "being set offline\n", dev_name(&cdev
->dev
));
363 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
364 pr_warning("%s: The device stopped operating while "
365 "being set offline\n", dev_name(&cdev
->dev
));
367 /* Give up reference from ccw_device_set_online(). */
368 put_device(&cdev
->dev
);
372 cdev
->private->state
= DEV_STATE_OFFLINE
;
373 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
374 spin_unlock_irq(cdev
->ccwlock
);
375 /* Give up reference from ccw_device_set_online(). */
376 put_device(&cdev
->dev
);
381 * ccw_device_set_online() - enable a ccw device for I/O
382 * @cdev: target ccw device
384 * This function first enables @cdev and then calls the driver's set_online()
385 * function for @cdev, if given. If set_online() returns an error, @cdev is
388 * %0 on success and a negative error value on failure.
390 * enabled, ccw device lock not held
392 int ccw_device_set_online(struct ccw_device
*cdev
)
399 if (cdev
->online
|| !cdev
->drv
)
401 /* Hold on to an extra reference while device is online. */
402 if (!get_device(&cdev
->dev
))
405 spin_lock_irq(cdev
->ccwlock
);
406 ret
= ccw_device_online(cdev
);
407 spin_unlock_irq(cdev
->ccwlock
);
409 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
411 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
412 "device 0.%x.%04x\n",
413 ret
, cdev
->private->dev_id
.ssid
,
414 cdev
->private->dev_id
.devno
);
415 /* Give up online reference since onlining failed. */
416 put_device(&cdev
->dev
);
419 spin_lock_irq(cdev
->ccwlock
);
420 /* Check if online processing was successful */
421 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
422 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
423 spin_unlock_irq(cdev
->ccwlock
);
424 /* Inform the user that set online failed. */
425 if (cdev
->private->state
== DEV_STATE_BOXED
) {
426 pr_warning("%s: Setting the device online failed "
427 "because it is boxed\n",
428 dev_name(&cdev
->dev
));
429 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
430 pr_warning("%s: Setting the device online failed "
431 "because it is not operational\n",
432 dev_name(&cdev
->dev
));
434 /* Give up online reference since onlining failed. */
435 put_device(&cdev
->dev
);
438 spin_unlock_irq(cdev
->ccwlock
);
439 if (cdev
->drv
->set_online
)
440 ret
= cdev
->drv
->set_online(cdev
);
447 spin_lock_irq(cdev
->ccwlock
);
448 /* Wait until a final state or DISCONNECTED is reached */
449 while (!dev_fsm_final_state(cdev
) &&
450 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
451 spin_unlock_irq(cdev
->ccwlock
);
452 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
453 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
454 spin_lock_irq(cdev
->ccwlock
);
456 ret2
= ccw_device_offline(cdev
);
459 spin_unlock_irq(cdev
->ccwlock
);
460 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
461 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
462 /* Give up online reference since onlining failed. */
463 put_device(&cdev
->dev
);
467 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
468 "device 0.%x.%04x\n",
469 ret2
, cdev
->private->dev_id
.ssid
,
470 cdev
->private->dev_id
.devno
);
471 cdev
->private->state
= DEV_STATE_OFFLINE
;
472 spin_unlock_irq(cdev
->ccwlock
);
473 /* Give up online reference since onlining failed. */
474 put_device(&cdev
->dev
);
478 static int online_store_handle_offline(struct ccw_device
*cdev
)
480 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
) {
481 spin_lock_irq(cdev
->ccwlock
);
482 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
483 spin_unlock_irq(cdev
->ccwlock
);
484 } else if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->set_offline
)
485 return ccw_device_set_offline(cdev
);
489 static int online_store_recog_and_online(struct ccw_device
*cdev
)
491 /* Do device recognition, if needed. */
492 if (cdev
->private->state
== DEV_STATE_BOXED
) {
493 spin_lock_irq(cdev
->ccwlock
);
494 ccw_device_recognition(cdev
);
495 spin_unlock_irq(cdev
->ccwlock
);
496 wait_event(cdev
->private->wait_q
,
497 cdev
->private->flags
.recog_done
);
498 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
499 /* recognition failed */
502 if (cdev
->drv
&& cdev
->drv
->set_online
)
503 ccw_device_set_online(cdev
);
507 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
511 ret
= online_store_recog_and_online(cdev
);
514 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
515 ret
= ccw_device_stlck(cdev
);
518 if (cdev
->id
.cu_type
== 0)
519 cdev
->private->state
= DEV_STATE_NOT_OPER
;
520 ret
= online_store_recog_and_online(cdev
);
527 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
528 const char *buf
, size_t count
)
530 struct ccw_device
*cdev
= to_ccwdev(dev
);
534 if (!dev_fsm_final_state(cdev
) &&
535 cdev
->private->state
!= DEV_STATE_DISCONNECTED
)
537 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
540 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
541 atomic_set(&cdev
->private->onoff
, 0);
544 if (!strncmp(buf
, "force\n", count
)) {
550 ret
= strict_strtoul(buf
, 16, &i
);
556 ret
= online_store_handle_offline(cdev
);
559 ret
= online_store_handle_online(cdev
, force
);
566 module_put(cdev
->drv
->owner
);
567 atomic_set(&cdev
->private->onoff
, 0);
568 return (ret
< 0) ? ret
: count
;
572 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
574 struct ccw_device
*cdev
= to_ccwdev(dev
);
575 struct subchannel
*sch
;
577 if (ccw_device_is_orphan(cdev
))
578 return sprintf(buf
, "no device\n");
579 switch (cdev
->private->state
) {
580 case DEV_STATE_BOXED
:
581 return sprintf(buf
, "boxed\n");
582 case DEV_STATE_DISCONNECTED
:
583 case DEV_STATE_DISCONNECTED_SENSE_ID
:
584 case DEV_STATE_NOT_OPER
:
585 sch
= to_subchannel(dev
->parent
);
587 return sprintf(buf
, "no path\n");
589 return sprintf(buf
, "no device\n");
591 /* All other states considered fine. */
592 return sprintf(buf
, "good\n");
596 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
597 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
598 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
599 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
600 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
601 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
602 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
604 static struct attribute
*io_subchannel_attrs
[] = {
605 &dev_attr_chpids
.attr
,
606 &dev_attr_pimpampom
.attr
,
610 static struct attribute_group io_subchannel_attr_group
= {
611 .attrs
= io_subchannel_attrs
,
614 static struct attribute
* ccwdev_attrs
[] = {
615 &dev_attr_devtype
.attr
,
616 &dev_attr_cutype
.attr
,
617 &dev_attr_modalias
.attr
,
618 &dev_attr_online
.attr
,
619 &dev_attr_cmb_enable
.attr
,
620 &dev_attr_availability
.attr
,
624 static struct attribute_group ccwdev_attr_group
= {
625 .attrs
= ccwdev_attrs
,
628 static const struct attribute_group
*ccwdev_attr_groups
[] = {
633 /* this is a simple abstraction for device_register that sets the
634 * correct bus type and adds the bus specific files */
635 static int ccw_device_register(struct ccw_device
*cdev
)
637 struct device
*dev
= &cdev
->dev
;
640 dev
->bus
= &ccw_bus_type
;
641 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
642 cdev
->private->dev_id
.devno
);
645 return device_add(dev
);
648 static int match_dev_id(struct device
*dev
, void *data
)
650 struct ccw_device
*cdev
= to_ccwdev(dev
);
651 struct ccw_dev_id
*dev_id
= data
;
653 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
656 static struct ccw_device
*get_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
)
660 dev
= bus_find_device(&ccw_bus_type
, NULL
, dev_id
, match_dev_id
);
662 return dev
? to_ccwdev(dev
) : NULL
;
665 static void ccw_device_do_unbind_bind(struct ccw_device
*cdev
)
669 if (device_is_registered(&cdev
->dev
)) {
670 device_release_driver(&cdev
->dev
);
671 ret
= device_attach(&cdev
->dev
);
672 WARN_ON(ret
== -ENODEV
);
677 ccw_device_release(struct device
*dev
)
679 struct ccw_device
*cdev
;
681 cdev
= to_ccwdev(dev
);
682 /* Release reference of parent subchannel. */
683 put_device(cdev
->dev
.parent
);
684 kfree(cdev
->private);
688 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
690 struct ccw_device
*cdev
;
692 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
694 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
695 GFP_KERNEL
| GFP_DMA
);
700 return ERR_PTR(-ENOMEM
);
703 static void ccw_device_todo(struct work_struct
*work
);
705 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
706 struct ccw_device
*cdev
)
708 cdev
->private->cdev
= cdev
;
709 atomic_set(&cdev
->private->onoff
, 0);
710 cdev
->dev
.parent
= &sch
->dev
;
711 cdev
->dev
.release
= ccw_device_release
;
712 INIT_WORK(&cdev
->private->todo_work
, ccw_device_todo
);
713 cdev
->dev
.groups
= ccwdev_attr_groups
;
714 /* Do first half of device_register. */
715 device_initialize(&cdev
->dev
);
716 if (!get_device(&sch
->dev
)) {
717 /* Release reference from device_initialize(). */
718 put_device(&cdev
->dev
);
721 cdev
->private->flags
.initialized
= 1;
725 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
727 struct ccw_device
*cdev
;
730 cdev
= io_subchannel_allocate_dev(sch
);
732 ret
= io_subchannel_initialize_dev(sch
, cdev
);
739 static void io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
741 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
743 struct ccw_device
*cdev
;
745 /* Need to allocate a new ccw device. */
746 cdev
= io_subchannel_create_ccwdev(sch
);
748 /* OK, we did everything we could... */
749 css_sch_device_unregister(sch
);
752 /* Start recognition for the new ccw device. */
753 io_subchannel_recog(cdev
, sch
);
757 * Register recognized device.
759 static void io_subchannel_register(struct ccw_device
*cdev
)
761 struct subchannel
*sch
;
765 sch
= to_subchannel(cdev
->dev
.parent
);
767 * Check if subchannel is still registered. It may have become
768 * unregistered if a machine check hit us after finishing
769 * device recognition but before the register work could be
772 if (!device_is_registered(&sch
->dev
))
774 css_update_ssd_info(sch
);
776 * io_subchannel_register() will also be called after device
777 * recognition has been done for a boxed device (which will already
778 * be registered). We need to reprobe since we may now have sense id
781 if (device_is_registered(&cdev
->dev
)) {
783 ret
= device_reprobe(&cdev
->dev
);
785 /* We can't do much here. */
786 CIO_MSG_EVENT(0, "device_reprobe() returned"
787 " %d for 0.%x.%04x\n", ret
,
788 cdev
->private->dev_id
.ssid
,
789 cdev
->private->dev_id
.devno
);
794 * Now we know this subchannel will stay, we can throw
795 * our delayed uevent.
797 dev_set_uevent_suppress(&sch
->dev
, 0);
798 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
799 /* make it known to the system */
800 ret
= ccw_device_register(cdev
);
802 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
803 cdev
->private->dev_id
.ssid
,
804 cdev
->private->dev_id
.devno
, ret
);
805 spin_lock_irqsave(sch
->lock
, flags
);
806 sch_set_cdev(sch
, NULL
);
807 spin_unlock_irqrestore(sch
->lock
, flags
);
808 /* Release initial device reference. */
809 put_device(&cdev
->dev
);
813 cdev
->private->flags
.recog_done
= 1;
814 wake_up(&cdev
->private->wait_q
);
816 if (atomic_dec_and_test(&ccw_device_init_count
))
817 wake_up(&ccw_device_init_wq
);
820 static void ccw_device_call_sch_unregister(struct ccw_device
*cdev
)
822 struct subchannel
*sch
;
824 /* Get subchannel reference for local processing. */
825 if (!get_device(cdev
->dev
.parent
))
827 sch
= to_subchannel(cdev
->dev
.parent
);
828 css_sch_device_unregister(sch
);
829 /* Release subchannel reference for local processing. */
830 put_device(&sch
->dev
);
834 * subchannel recognition done. Called from the state machine.
837 io_subchannel_recog_done(struct ccw_device
*cdev
)
839 if (css_init_done
== 0) {
840 cdev
->private->flags
.recog_done
= 1;
843 switch (cdev
->private->state
) {
844 case DEV_STATE_BOXED
:
845 /* Device did not respond in time. */
846 case DEV_STATE_NOT_OPER
:
847 cdev
->private->flags
.recog_done
= 1;
848 /* Remove device found not operational. */
849 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
850 if (atomic_dec_and_test(&ccw_device_init_count
))
851 wake_up(&ccw_device_init_wq
);
853 case DEV_STATE_OFFLINE
:
855 * We can't register the device in interrupt context so
856 * we schedule a work item.
858 ccw_device_sched_todo(cdev
, CDEV_TODO_REGISTER
);
863 static void io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
865 struct ccw_device_private
*priv
;
867 cdev
->ccwlock
= sch
->lock
;
869 /* Init private data. */
870 priv
= cdev
->private;
871 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
872 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
873 priv
->schid
= sch
->schid
;
874 priv
->state
= DEV_STATE_NOT_OPER
;
875 INIT_LIST_HEAD(&priv
->cmb_list
);
876 init_waitqueue_head(&priv
->wait_q
);
877 init_timer(&priv
->timer
);
879 /* Increase counter of devices currently in recognition. */
880 atomic_inc(&ccw_device_init_count
);
882 /* Start async. device sensing. */
883 spin_lock_irq(sch
->lock
);
884 sch_set_cdev(sch
, cdev
);
885 ccw_device_recognition(cdev
);
886 spin_unlock_irq(sch
->lock
);
889 static int ccw_device_move_to_sch(struct ccw_device
*cdev
,
890 struct subchannel
*sch
)
892 struct subchannel
*old_sch
;
893 int rc
, old_enabled
= 0;
895 old_sch
= to_subchannel(cdev
->dev
.parent
);
896 /* Obtain child reference for new parent. */
897 if (!get_device(&sch
->dev
))
900 if (!sch_is_pseudo_sch(old_sch
)) {
901 spin_lock_irq(old_sch
->lock
);
902 old_enabled
= old_sch
->schib
.pmcw
.ena
;
905 rc
= cio_disable_subchannel(old_sch
);
906 spin_unlock_irq(old_sch
->lock
);
908 /* Release child reference for new parent. */
909 put_device(&sch
->dev
);
914 mutex_lock(&sch
->reg_mutex
);
915 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
916 mutex_unlock(&sch
->reg_mutex
);
918 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
919 cdev
->private->dev_id
.ssid
,
920 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
921 sch
->schib
.pmcw
.dev
, rc
);
923 /* Try to reenable the old subchannel. */
924 spin_lock_irq(old_sch
->lock
);
925 cio_enable_subchannel(old_sch
, (u32
)(addr_t
)old_sch
);
926 spin_unlock_irq(old_sch
->lock
);
928 /* Release child reference for new parent. */
929 put_device(&sch
->dev
);
932 /* Clean up old subchannel. */
933 if (!sch_is_pseudo_sch(old_sch
)) {
934 spin_lock_irq(old_sch
->lock
);
935 sch_set_cdev(old_sch
, NULL
);
936 spin_unlock_irq(old_sch
->lock
);
937 css_schedule_eval(old_sch
->schid
);
939 /* Release child reference for old parent. */
940 put_device(&old_sch
->dev
);
941 /* Initialize new subchannel. */
942 spin_lock_irq(sch
->lock
);
943 cdev
->private->schid
= sch
->schid
;
944 cdev
->ccwlock
= sch
->lock
;
945 if (!sch_is_pseudo_sch(sch
))
946 sch_set_cdev(sch
, cdev
);
947 spin_unlock_irq(sch
->lock
);
948 if (!sch_is_pseudo_sch(sch
))
949 css_update_ssd_info(sch
);
953 static int ccw_device_move_to_orph(struct ccw_device
*cdev
)
955 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
956 struct channel_subsystem
*css
= to_css(sch
->dev
.parent
);
958 return ccw_device_move_to_sch(cdev
, css
->pseudo_subchannel
);
961 static void io_subchannel_irq(struct subchannel
*sch
)
963 struct ccw_device
*cdev
;
965 cdev
= sch_get_cdev(sch
);
967 CIO_TRACE_EVENT(6, "IRQ");
968 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
970 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
973 void io_subchannel_init_config(struct subchannel
*sch
)
975 memset(&sch
->config
, 0, sizeof(sch
->config
));
976 sch
->config
.csense
= 1;
979 static void io_subchannel_init_fields(struct subchannel
*sch
)
981 if (cio_is_console(sch
->schid
))
984 sch
->opm
= chp_get_sch_opm(sch
);
985 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
986 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
988 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
989 " - PIM = %02X, PAM = %02X, POM = %02X\n",
990 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
991 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
992 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
994 io_subchannel_init_config(sch
);
998 * Note: We always return 0 so that we bind to the device even on error.
999 * This is needed so that our remove function is called on unregister.
1001 static int io_subchannel_probe(struct subchannel
*sch
)
1003 struct ccw_device
*cdev
;
1006 if (cio_is_console(sch
->schid
)) {
1007 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1008 &io_subchannel_attr_group
);
1010 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1011 "attributes for subchannel "
1012 "0.%x.%04x (rc=%d)\n",
1013 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1015 * The console subchannel already has an associated ccw_device.
1016 * Throw the delayed uevent for the subchannel, register
1017 * the ccw_device and exit.
1019 dev_set_uevent_suppress(&sch
->dev
, 0);
1020 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1021 cdev
= sch_get_cdev(sch
);
1022 cdev
->dev
.groups
= ccwdev_attr_groups
;
1023 device_initialize(&cdev
->dev
);
1024 cdev
->private->flags
.initialized
= 1;
1025 ccw_device_register(cdev
);
1027 * Check if the device is already online. If it is
1028 * the reference count needs to be corrected since we
1029 * didn't obtain a reference in ccw_device_set_online.
1031 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1032 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1033 cdev
->private->state
!= DEV_STATE_BOXED
)
1034 get_device(&cdev
->dev
);
1037 io_subchannel_init_fields(sch
);
1038 rc
= cio_commit_config(sch
);
1041 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1042 &io_subchannel_attr_group
);
1045 /* Allocate I/O subchannel private data. */
1046 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1047 GFP_KERNEL
| GFP_DMA
);
1050 css_schedule_eval(sch
->schid
);
1054 spin_lock_irq(sch
->lock
);
1055 css_sched_sch_todo(sch
, SCH_TODO_UNREG
);
1056 spin_unlock_irq(sch
->lock
);
1061 io_subchannel_remove (struct subchannel
*sch
)
1063 struct ccw_device
*cdev
;
1065 cdev
= sch_get_cdev(sch
);
1068 io_subchannel_quiesce(sch
);
1069 /* Set ccw device to not operational and drop reference. */
1070 spin_lock_irq(cdev
->ccwlock
);
1071 sch_set_cdev(sch
, NULL
);
1072 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1073 spin_unlock_irq(cdev
->ccwlock
);
1074 ccw_device_unregister(cdev
);
1076 kfree(sch
->private);
1077 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1081 static void io_subchannel_verify(struct subchannel
*sch
)
1083 struct ccw_device
*cdev
;
1085 cdev
= sch_get_cdev(sch
);
1087 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1090 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1092 struct ccw_device
*cdev
;
1094 cdev
= sch_get_cdev(sch
);
1097 if (cio_update_schib(sch
))
1099 /* Check for I/O on path. */
1100 if (scsw_actl(&sch
->schib
.scsw
) == 0 || sch
->schib
.pmcw
.lpum
!= mask
)
1102 if (cdev
->private->state
== DEV_STATE_ONLINE
) {
1103 ccw_device_kill_io(cdev
);
1109 /* Trigger path verification. */
1110 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1114 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1117 static int io_subchannel_chp_event(struct subchannel
*sch
,
1118 struct chp_link
*link
, int event
)
1122 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1129 io_subchannel_terminate_path(sch
, mask
);
1134 io_subchannel_verify(sch
);
1137 if (cio_update_schib(sch
))
1139 io_subchannel_terminate_path(sch
, mask
);
1142 if (cio_update_schib(sch
))
1144 sch
->lpm
|= mask
& sch
->opm
;
1145 io_subchannel_verify(sch
);
1151 static void io_subchannel_quiesce(struct subchannel
*sch
)
1153 struct ccw_device
*cdev
;
1156 spin_lock_irq(sch
->lock
);
1157 cdev
= sch_get_cdev(sch
);
1158 if (cio_is_console(sch
->schid
))
1160 if (!sch
->schib
.pmcw
.ena
)
1162 ret
= cio_disable_subchannel(sch
);
1166 cdev
->handler(cdev
, cdev
->private->intparm
, ERR_PTR(-EIO
));
1167 while (ret
== -EBUSY
) {
1168 cdev
->private->state
= DEV_STATE_QUIESCE
;
1169 ret
= ccw_device_cancel_halt_clear(cdev
);
1170 if (ret
== -EBUSY
) {
1171 ccw_device_set_timeout(cdev
, HZ
/10);
1172 spin_unlock_irq(sch
->lock
);
1173 wait_event(cdev
->private->wait_q
,
1174 cdev
->private->state
!= DEV_STATE_QUIESCE
);
1175 spin_lock_irq(sch
->lock
);
1177 ret
= cio_disable_subchannel(sch
);
1180 spin_unlock_irq(sch
->lock
);
1183 static void io_subchannel_shutdown(struct subchannel
*sch
)
1185 io_subchannel_quiesce(sch
);
1188 static int device_is_disconnected(struct ccw_device
*cdev
)
1192 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1193 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1196 static int recovery_check(struct device
*dev
, void *data
)
1198 struct ccw_device
*cdev
= to_ccwdev(dev
);
1201 spin_lock_irq(cdev
->ccwlock
);
1202 switch (cdev
->private->state
) {
1203 case DEV_STATE_DISCONNECTED
:
1204 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1205 cdev
->private->dev_id
.ssid
,
1206 cdev
->private->dev_id
.devno
);
1207 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1210 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1214 spin_unlock_irq(cdev
->ccwlock
);
1219 static void recovery_work_func(struct work_struct
*unused
)
1223 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1225 spin_lock_irq(&recovery_lock
);
1226 if (!timer_pending(&recovery_timer
)) {
1227 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1229 mod_timer(&recovery_timer
, jiffies
+
1230 recovery_delay
[recovery_phase
] * HZ
);
1232 spin_unlock_irq(&recovery_lock
);
1234 CIO_MSG_EVENT(4, "recovery: end\n");
1237 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1239 static void recovery_func(unsigned long data
)
1242 * We can't do our recovery in softirq context and it's not
1243 * performance critical, so we schedule it.
1245 schedule_work(&recovery_work
);
1248 static void ccw_device_schedule_recovery(void)
1250 unsigned long flags
;
1252 CIO_MSG_EVENT(4, "recovery: schedule\n");
1253 spin_lock_irqsave(&recovery_lock
, flags
);
1254 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1256 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1258 spin_unlock_irqrestore(&recovery_lock
, flags
);
1261 static int purge_fn(struct device
*dev
, void *data
)
1263 struct ccw_device
*cdev
= to_ccwdev(dev
);
1264 struct ccw_dev_id
*id
= &cdev
->private->dev_id
;
1266 spin_lock_irq(cdev
->ccwlock
);
1267 if (is_blacklisted(id
->ssid
, id
->devno
) &&
1268 (cdev
->private->state
== DEV_STATE_OFFLINE
)) {
1269 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id
->ssid
,
1271 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1273 spin_unlock_irq(cdev
->ccwlock
);
1274 /* Abort loop in case of pending signal. */
1275 if (signal_pending(current
))
1282 * ccw_purge_blacklisted - purge unused, blacklisted devices
1284 * Unregister all ccw devices that are offline and on the blacklist.
1286 int ccw_purge_blacklisted(void)
1288 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1289 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1293 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1297 ccw_device_set_timeout(cdev
, 0);
1298 cdev
->private->flags
.fake_irb
= 0;
1299 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1301 ccw_device_schedule_recovery();
1304 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1306 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1308 CIO_TRACE_EVENT(2, "notoper");
1309 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1310 ccw_device_set_timeout(cdev
, 0);
1311 cio_disable_subchannel(sch
);
1312 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1315 enum io_sch_action
{
1319 IO_SCH_UNREG_ATTACH
,
1327 static enum io_sch_action
sch_get_action(struct subchannel
*sch
)
1329 struct ccw_device
*cdev
;
1331 cdev
= sch_get_cdev(sch
);
1332 if (cio_update_schib(sch
)) {
1333 /* Not operational. */
1335 return IO_SCH_UNREG
;
1336 if (!ccw_device_notify(cdev
, CIO_GONE
))
1337 return IO_SCH_UNREG
;
1338 return IO_SCH_ORPH_UNREG
;
1342 return IO_SCH_ATTACH
;
1343 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1344 if (!ccw_device_notify(cdev
, CIO_GONE
))
1345 return IO_SCH_UNREG_ATTACH
;
1346 return IO_SCH_ORPH_ATTACH
;
1348 if ((sch
->schib
.pmcw
.pam
& sch
->opm
) == 0) {
1349 if (!ccw_device_notify(cdev
, CIO_NO_PATH
))
1350 return IO_SCH_UNREG
;
1353 if (device_is_disconnected(cdev
))
1354 return IO_SCH_REPROBE
;
1356 return IO_SCH_VERIFY
;
1361 * io_subchannel_sch_event - process subchannel event
1363 * @process: non-zero if function is called in process context
1365 * An unspecified event occurred for this subchannel. Adjust data according
1366 * to the current operational state of the subchannel and device. Return
1367 * zero when the event has been handled sufficiently or -EAGAIN when this
1368 * function should be called again in process context.
1370 static int io_subchannel_sch_event(struct subchannel
*sch
, int process
)
1372 unsigned long flags
;
1373 struct ccw_device
*cdev
;
1374 struct ccw_dev_id dev_id
;
1375 enum io_sch_action action
;
1378 spin_lock_irqsave(sch
->lock
, flags
);
1379 if (!device_is_registered(&sch
->dev
))
1381 if (work_pending(&sch
->todo_work
))
1383 cdev
= sch_get_cdev(sch
);
1384 if (cdev
&& work_pending(&cdev
->private->todo_work
))
1386 action
= sch_get_action(sch
);
1387 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1388 sch
->schid
.ssid
, sch
->schid
.sch_no
, process
,
1390 /* Perform immediate actions while holding the lock. */
1392 case IO_SCH_REPROBE
:
1393 /* Trigger device recognition. */
1394 ccw_device_trigger_reprobe(cdev
);
1398 /* Trigger path verification. */
1399 io_subchannel_verify(sch
);
1403 ccw_device_set_disconnected(cdev
);
1406 case IO_SCH_ORPH_UNREG
:
1407 case IO_SCH_ORPH_ATTACH
:
1408 ccw_device_set_disconnected(cdev
);
1410 case IO_SCH_UNREG_ATTACH
:
1413 ccw_device_set_notoper(cdev
);
1421 spin_unlock_irqrestore(sch
->lock
, flags
);
1422 /* All other actions require process context. */
1425 /* Handle attached ccw device. */
1427 case IO_SCH_ORPH_UNREG
:
1428 case IO_SCH_ORPH_ATTACH
:
1429 /* Move ccw device to orphanage. */
1430 rc
= ccw_device_move_to_orph(cdev
);
1434 case IO_SCH_UNREG_ATTACH
:
1435 /* Unregister ccw device. */
1436 ccw_device_unregister(cdev
);
1441 /* Handle subchannel. */
1443 case IO_SCH_ORPH_UNREG
:
1445 css_sch_device_unregister(sch
);
1447 case IO_SCH_ORPH_ATTACH
:
1448 case IO_SCH_UNREG_ATTACH
:
1450 dev_id
.ssid
= sch
->schid
.ssid
;
1451 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1452 cdev
= get_ccwdev_by_dev_id(&dev_id
);
1454 sch_create_and_recog_new_device(sch
);
1457 rc
= ccw_device_move_to_sch(cdev
, sch
);
1459 /* Release reference from get_ccwdev_by_dev_id() */
1460 put_device(&cdev
->dev
);
1463 spin_lock_irqsave(sch
->lock
, flags
);
1464 ccw_device_trigger_reprobe(cdev
);
1465 spin_unlock_irqrestore(sch
->lock
, flags
);
1466 /* Release reference from get_ccwdev_by_dev_id() */
1467 put_device(&cdev
->dev
);
1475 spin_unlock_irqrestore(sch
->lock
, flags
);
1480 #ifdef CONFIG_CCW_CONSOLE
1481 static struct ccw_device console_cdev
;
1482 static struct ccw_device_private console_private
;
1483 static int console_cdev_in_use
;
1485 static DEFINE_SPINLOCK(ccw_console_lock
);
1487 spinlock_t
* cio_get_console_lock(void)
1489 return &ccw_console_lock
;
1492 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1493 struct subchannel
*sch
)
1497 /* Attach subchannel private data. */
1498 sch
->private = cio_get_console_priv();
1499 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1500 io_subchannel_init_fields(sch
);
1501 rc
= cio_commit_config(sch
);
1504 sch
->driver
= &io_subchannel_driver
;
1505 /* Initialize the ccw_device structure. */
1506 cdev
->dev
.parent
= &sch
->dev
;
1507 sch_set_cdev(sch
, cdev
);
1508 io_subchannel_recog(cdev
, sch
);
1509 /* Now wait for the async. recognition to come to an end. */
1510 spin_lock_irq(cdev
->ccwlock
);
1511 while (!dev_fsm_final_state(cdev
))
1514 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1516 ccw_device_online(cdev
);
1517 while (!dev_fsm_final_state(cdev
))
1519 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1523 spin_unlock_irq(cdev
->ccwlock
);
1528 ccw_device_probe_console(void)
1530 struct subchannel
*sch
;
1533 if (xchg(&console_cdev_in_use
, 1) != 0)
1534 return ERR_PTR(-EBUSY
);
1535 sch
= cio_probe_console();
1537 console_cdev_in_use
= 0;
1538 return (void *) sch
;
1540 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1541 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1542 console_cdev
.private = &console_private
;
1543 console_private
.cdev
= &console_cdev
;
1544 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1546 cio_release_console();
1547 console_cdev_in_use
= 0;
1548 return ERR_PTR(ret
);
1550 console_cdev
.online
= 1;
1551 return &console_cdev
;
1554 static int ccw_device_pm_restore(struct device
*dev
);
1556 int ccw_device_force_console(void)
1558 if (!console_cdev_in_use
)
1560 return ccw_device_pm_restore(&console_cdev
.dev
);
1562 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1566 * get ccw_device matching the busid, but only if owned by cdrv
1569 __ccwdev_check_busid(struct device
*dev
, void *id
)
1575 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1580 * get_ccwdev_by_busid() - obtain device from a bus id
1581 * @cdrv: driver the device is owned by
1582 * @bus_id: bus id of the device to be searched
1584 * This function searches all devices owned by @cdrv for a device with a bus
1585 * id matching @bus_id.
1587 * If a match is found, its reference count of the found device is increased
1588 * and it is returned; else %NULL is returned.
1590 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1594 struct device_driver
*drv
;
1596 drv
= get_driver(&cdrv
->driver
);
1600 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1601 __ccwdev_check_busid
);
1604 return dev
? to_ccwdev(dev
) : NULL
;
1607 /************************** device driver handling ************************/
1609 /* This is the implementation of the ccw_driver class. The probe, remove
1610 * and release methods are initially very similar to the device_driver
1611 * implementations, with the difference that they have ccw_device
1614 * A ccw driver also contains the information that is needed for
1618 ccw_device_probe (struct device
*dev
)
1620 struct ccw_device
*cdev
= to_ccwdev(dev
);
1621 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1624 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1626 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1637 ccw_device_remove (struct device
*dev
)
1639 struct ccw_device
*cdev
= to_ccwdev(dev
);
1640 struct ccw_driver
*cdrv
= cdev
->drv
;
1647 spin_lock_irq(cdev
->ccwlock
);
1648 ret
= ccw_device_offline(cdev
);
1649 spin_unlock_irq(cdev
->ccwlock
);
1651 wait_event(cdev
->private->wait_q
,
1652 dev_fsm_final_state(cdev
));
1654 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1655 "device 0.%x.%04x\n",
1656 ret
, cdev
->private->dev_id
.ssid
,
1657 cdev
->private->dev_id
.devno
);
1658 /* Give up reference obtained in ccw_device_set_online(). */
1659 put_device(&cdev
->dev
);
1661 ccw_device_set_timeout(cdev
, 0);
1666 static void ccw_device_shutdown(struct device
*dev
)
1668 struct ccw_device
*cdev
;
1670 cdev
= to_ccwdev(dev
);
1671 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1672 cdev
->drv
->shutdown(cdev
);
1676 static int ccw_device_pm_prepare(struct device
*dev
)
1678 struct ccw_device
*cdev
= to_ccwdev(dev
);
1680 if (work_pending(&cdev
->private->todo_work
))
1682 /* Fail while device is being set online/offline. */
1683 if (atomic_read(&cdev
->private->onoff
))
1686 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1687 return cdev
->drv
->prepare(cdev
);
1692 static void ccw_device_pm_complete(struct device
*dev
)
1694 struct ccw_device
*cdev
= to_ccwdev(dev
);
1696 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1697 cdev
->drv
->complete(cdev
);
1700 static int ccw_device_pm_freeze(struct device
*dev
)
1702 struct ccw_device
*cdev
= to_ccwdev(dev
);
1703 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1704 int ret
, cm_enabled
;
1706 /* Fail suspend while device is in transistional state. */
1707 if (!dev_fsm_final_state(cdev
))
1711 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1712 ret
= cdev
->drv
->freeze(cdev
);
1717 spin_lock_irq(sch
->lock
);
1718 cm_enabled
= cdev
->private->cmb
!= NULL
;
1719 spin_unlock_irq(sch
->lock
);
1721 /* Don't have the css write on memory. */
1722 ret
= ccw_set_cmf(cdev
, 0);
1726 /* From here on, disallow device driver I/O. */
1727 spin_lock_irq(sch
->lock
);
1728 ret
= cio_disable_subchannel(sch
);
1729 spin_unlock_irq(sch
->lock
);
1734 static int ccw_device_pm_thaw(struct device
*dev
)
1736 struct ccw_device
*cdev
= to_ccwdev(dev
);
1737 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1738 int ret
, cm_enabled
;
1743 spin_lock_irq(sch
->lock
);
1744 /* Allow device driver I/O again. */
1745 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1746 cm_enabled
= cdev
->private->cmb
!= NULL
;
1747 spin_unlock_irq(sch
->lock
);
1752 ret
= ccw_set_cmf(cdev
, 1);
1757 if (cdev
->drv
&& cdev
->drv
->thaw
)
1758 ret
= cdev
->drv
->thaw(cdev
);
1763 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
1765 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1767 if (cio_is_console(sch
->schid
))
1770 * While we were sleeping, devices may have gone or become
1771 * available again. Kick re-detection.
1773 spin_lock_irq(sch
->lock
);
1774 cdev
->private->flags
.resuming
= 1;
1775 ccw_device_recognition(cdev
);
1776 spin_unlock_irq(sch
->lock
);
1777 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
1778 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
1780 cdev
->private->flags
.resuming
= 0;
1783 static int resume_handle_boxed(struct ccw_device
*cdev
)
1785 cdev
->private->state
= DEV_STATE_BOXED
;
1786 if (ccw_device_notify(cdev
, CIO_BOXED
))
1788 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1792 static int resume_handle_disc(struct ccw_device
*cdev
)
1794 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1795 if (ccw_device_notify(cdev
, CIO_GONE
))
1797 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1801 static int ccw_device_pm_restore(struct device
*dev
)
1803 struct ccw_device
*cdev
= to_ccwdev(dev
);
1804 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1805 int ret
= 0, cm_enabled
;
1807 __ccw_device_pm_restore(cdev
);
1808 spin_lock_irq(sch
->lock
);
1809 if (cio_is_console(sch
->schid
)) {
1810 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1811 spin_unlock_irq(sch
->lock
);
1814 cdev
->private->flags
.donotify
= 0;
1815 /* check recognition results */
1816 switch (cdev
->private->state
) {
1817 case DEV_STATE_OFFLINE
:
1819 case DEV_STATE_BOXED
:
1820 ret
= resume_handle_boxed(cdev
);
1821 spin_unlock_irq(sch
->lock
);
1825 case DEV_STATE_DISCONNECTED
:
1826 goto out_disc_unlock
;
1828 goto out_unreg_unlock
;
1830 /* check if the device id has changed */
1831 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1832 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
1833 "changed from %04x to %04x)\n",
1834 sch
->schid
.ssid
, sch
->schid
.sch_no
,
1835 cdev
->private->dev_id
.devno
,
1836 sch
->schib
.pmcw
.dev
);
1837 goto out_unreg_unlock
;
1839 /* check if the device type has changed */
1840 if (!ccw_device_test_sense_data(cdev
)) {
1841 ccw_device_update_sense_data(cdev
);
1842 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
1846 if (!cdev
->online
) {
1850 ret
= ccw_device_online(cdev
);
1852 goto out_disc_unlock
;
1854 cm_enabled
= cdev
->private->cmb
!= NULL
;
1855 spin_unlock_irq(sch
->lock
);
1857 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1858 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
1859 spin_lock_irq(sch
->lock
);
1860 goto out_disc_unlock
;
1863 ret
= ccw_set_cmf(cdev
, 1);
1865 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1866 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
1867 cdev
->private->dev_id
.devno
, ret
);
1873 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
1874 ret
= cdev
->drv
->restore(cdev
);
1879 ret
= resume_handle_disc(cdev
);
1880 spin_unlock_irq(sch
->lock
);
1886 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
1889 spin_unlock_irq(sch
->lock
);
1893 static const struct dev_pm_ops ccw_pm_ops
= {
1894 .prepare
= ccw_device_pm_prepare
,
1895 .complete
= ccw_device_pm_complete
,
1896 .freeze
= ccw_device_pm_freeze
,
1897 .thaw
= ccw_device_pm_thaw
,
1898 .restore
= ccw_device_pm_restore
,
1901 struct bus_type ccw_bus_type
= {
1903 .match
= ccw_bus_match
,
1904 .uevent
= ccw_uevent
,
1905 .probe
= ccw_device_probe
,
1906 .remove
= ccw_device_remove
,
1907 .shutdown
= ccw_device_shutdown
,
1912 * ccw_driver_register() - register a ccw driver
1913 * @cdriver: driver to be registered
1915 * This function is mainly a wrapper around driver_register().
1917 * %0 on success and a negative error value on failure.
1919 int ccw_driver_register(struct ccw_driver
*cdriver
)
1921 struct device_driver
*drv
= &cdriver
->driver
;
1923 drv
->bus
= &ccw_bus_type
;
1924 drv
->name
= cdriver
->name
;
1925 drv
->owner
= cdriver
->owner
;
1927 return driver_register(drv
);
1931 * ccw_driver_unregister() - deregister a ccw driver
1932 * @cdriver: driver to be deregistered
1934 * This function is mainly a wrapper around driver_unregister().
1936 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
1938 driver_unregister(&cdriver
->driver
);
1941 /* Helper func for qdio. */
1942 struct subchannel_id
1943 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1945 struct subchannel
*sch
;
1947 sch
= to_subchannel(cdev
->dev
.parent
);
1951 static void ccw_device_todo(struct work_struct
*work
)
1953 struct ccw_device_private
*priv
;
1954 struct ccw_device
*cdev
;
1955 struct subchannel
*sch
;
1956 enum cdev_todo todo
;
1958 priv
= container_of(work
, struct ccw_device_private
, todo_work
);
1960 sch
= to_subchannel(cdev
->dev
.parent
);
1961 /* Find out todo. */
1962 spin_lock_irq(cdev
->ccwlock
);
1964 priv
->todo
= CDEV_TODO_NOTHING
;
1965 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1966 priv
->dev_id
.ssid
, priv
->dev_id
.devno
, todo
);
1967 spin_unlock_irq(cdev
->ccwlock
);
1970 case CDEV_TODO_ENABLE_CMF
:
1973 case CDEV_TODO_REBIND
:
1974 ccw_device_do_unbind_bind(cdev
);
1976 case CDEV_TODO_REGISTER
:
1977 io_subchannel_register(cdev
);
1979 case CDEV_TODO_UNREG_EVAL
:
1980 if (!sch_is_pseudo_sch(sch
))
1981 css_schedule_eval(sch
->schid
);
1983 case CDEV_TODO_UNREG
:
1984 if (sch_is_pseudo_sch(sch
))
1985 ccw_device_unregister(cdev
);
1987 ccw_device_call_sch_unregister(cdev
);
1992 /* Release workqueue ref. */
1993 put_device(&cdev
->dev
);
1997 * ccw_device_sched_todo - schedule ccw device operation
2001 * Schedule the operation identified by @todo to be performed on the slow path
2002 * workqueue. Do nothing if another operation with higher priority is already
2003 * scheduled. Needs to be called with ccwdev lock held.
2005 void ccw_device_sched_todo(struct ccw_device
*cdev
, enum cdev_todo todo
)
2007 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2008 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
2010 if (cdev
->private->todo
>= todo
)
2012 cdev
->private->todo
= todo
;
2013 /* Get workqueue ref. */
2014 if (!get_device(&cdev
->dev
))
2016 if (!queue_work(cio_work_q
, &cdev
->private->todo_work
)) {
2017 /* Already queued, release workqueue ref. */
2018 put_device(&cdev
->dev
);
2022 MODULE_LICENSE("GPL");
2023 EXPORT_SYMBOL(ccw_device_set_online
);
2024 EXPORT_SYMBOL(ccw_device_set_offline
);
2025 EXPORT_SYMBOL(ccw_driver_register
);
2026 EXPORT_SYMBOL(ccw_driver_unregister
);
2027 EXPORT_SYMBOL(get_ccwdev_by_busid
);
2028 EXPORT_SYMBOL(ccw_bus_type
);
2029 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);