2 * bus driver for ccw devices
4 * Copyright IBM Corp. 2002, 2008
5 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #define KMSG_COMPONENT "cio"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/spinlock.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/slab.h>
19 #include <linux/list.h>
20 #include <linux/device.h>
21 #include <linux/workqueue.h>
22 #include <linux/timer.h>
23 #include <linux/kernel_stat.h>
25 #include <asm/ccwdev.h>
27 #include <asm/param.h> /* HZ */
33 #include "cio_debug.h"
38 #include "blacklist.h"
41 static struct timer_list recovery_timer
;
42 static DEFINE_SPINLOCK(recovery_lock
);
43 static int recovery_phase
;
44 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
46 /******************* bus type handling ***********************/
48 /* The Linux driver model distinguishes between a bus type and
49 * the bus itself. Of course we only have one channel
50 * subsystem driver and one channel system per machine, but
51 * we still use the abstraction. T.R. says it's a good idea. */
53 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
55 struct ccw_device
*cdev
= to_ccwdev(dev
);
56 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
57 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
62 found
= ccw_device_id_match(ids
, &cdev
->id
);
66 cdev
->id
.driver_info
= found
->driver_info
;
71 /* Store modalias string delimited by prefix/suffix string into buffer with
72 * specified size. Return length of resulting string (excluding trailing '\0')
73 * even if string doesn't fit buffer (snprintf semantics). */
74 static int snprint_alias(char *buf
, size_t size
,
75 struct ccw_device_id
*id
, const char *suffix
)
79 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
85 if (id
->dev_type
!= 0)
86 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
87 id
->dev_model
, suffix
);
89 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
94 /* Set up environment variables for ccw device uevent. Return 0 on success,
95 * non-zero otherwise. */
96 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
98 struct ccw_device
*cdev
= to_ccwdev(dev
);
99 struct ccw_device_id
*id
= &(cdev
->id
);
101 char modalias_buf
[30];
104 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
109 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
113 /* The next two can be zero, that's ok for us */
115 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
120 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
125 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
126 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
130 static struct bus_type ccw_bus_type
;
132 static void io_subchannel_irq(struct subchannel
*);
133 static int io_subchannel_probe(struct subchannel
*);
134 static int io_subchannel_remove(struct subchannel
*);
135 static void io_subchannel_shutdown(struct subchannel
*);
136 static int io_subchannel_sch_event(struct subchannel
*, int);
137 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
139 static void recovery_func(unsigned long data
);
140 wait_queue_head_t ccw_device_init_wq
;
141 atomic_t ccw_device_init_count
;
143 static struct css_device_id io_subchannel_ids
[] = {
144 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
145 { /* end of list */ },
147 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
149 static int io_subchannel_prepare(struct subchannel
*sch
)
151 struct ccw_device
*cdev
;
153 * Don't allow suspend while a ccw device registration
154 * is still outstanding.
156 cdev
= sch_get_cdev(sch
);
157 if (cdev
&& !device_is_registered(&cdev
->dev
))
162 static int io_subchannel_settle(void)
166 ret
= wait_event_interruptible(ccw_device_init_wq
,
167 atomic_read(&ccw_device_init_count
) == 0);
170 flush_workqueue(cio_work_q
);
174 static struct css_driver io_subchannel_driver
= {
176 .owner
= THIS_MODULE
,
177 .name
= "io_subchannel",
179 .subchannel_type
= io_subchannel_ids
,
180 .irq
= io_subchannel_irq
,
181 .sch_event
= io_subchannel_sch_event
,
182 .chp_event
= io_subchannel_chp_event
,
183 .probe
= io_subchannel_probe
,
184 .remove
= io_subchannel_remove
,
185 .shutdown
= io_subchannel_shutdown
,
186 .prepare
= io_subchannel_prepare
,
187 .settle
= io_subchannel_settle
,
190 int __init
io_subchannel_init(void)
194 init_waitqueue_head(&ccw_device_init_wq
);
195 atomic_set(&ccw_device_init_count
, 0);
196 setup_timer(&recovery_timer
, recovery_func
, 0);
198 ret
= bus_register(&ccw_bus_type
);
201 ret
= css_driver_register(&io_subchannel_driver
);
203 bus_unregister(&ccw_bus_type
);
209 /************************ device handling **************************/
212 * A ccw_device has some interfaces in sysfs in addition to the
214 * The following entries are designed to export the information which
215 * resided in 2.4 in /proc/subchannels. Subchannel and device number
216 * are obvious, so they don't have an entry :)
217 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
220 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
222 struct subchannel
*sch
= to_subchannel(dev
);
223 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
228 for (chp
= 0; chp
< 8; chp
++) {
230 if (ssd
->path_mask
& mask
)
231 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
233 ret
+= sprintf(buf
+ ret
, "00 ");
235 ret
+= sprintf (buf
+ret
, "\n");
236 return min((ssize_t
)PAGE_SIZE
, ret
);
240 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
242 struct subchannel
*sch
= to_subchannel(dev
);
243 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
245 return sprintf (buf
, "%02x %02x %02x\n",
246 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
250 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
252 struct ccw_device
*cdev
= to_ccwdev(dev
);
253 struct ccw_device_id
*id
= &(cdev
->id
);
255 if (id
->dev_type
!= 0)
256 return sprintf(buf
, "%04x/%02x\n",
257 id
->dev_type
, id
->dev_model
);
259 return sprintf(buf
, "n/a\n");
263 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
265 struct ccw_device
*cdev
= to_ccwdev(dev
);
266 struct ccw_device_id
*id
= &(cdev
->id
);
268 return sprintf(buf
, "%04x/%02x\n",
269 id
->cu_type
, id
->cu_model
);
273 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
275 struct ccw_device
*cdev
= to_ccwdev(dev
);
276 struct ccw_device_id
*id
= &(cdev
->id
);
279 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
281 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
285 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
287 struct ccw_device
*cdev
= to_ccwdev(dev
);
289 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
292 int ccw_device_is_orphan(struct ccw_device
*cdev
)
294 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
297 static void ccw_device_unregister(struct ccw_device
*cdev
)
299 if (device_is_registered(&cdev
->dev
)) {
300 /* Undo device_add(). */
301 device_del(&cdev
->dev
);
303 if (cdev
->private->flags
.initialized
) {
304 cdev
->private->flags
.initialized
= 0;
305 /* Release reference from device_initialize(). */
306 put_device(&cdev
->dev
);
310 static void io_subchannel_quiesce(struct subchannel
*);
313 * ccw_device_set_offline() - disable a ccw device for I/O
314 * @cdev: target ccw device
316 * This function calls the driver's set_offline() function for @cdev, if
317 * given, and then disables @cdev.
319 * %0 on success and a negative error value on failure.
321 * enabled, ccw device lock not held
323 int ccw_device_set_offline(struct ccw_device
*cdev
)
325 struct subchannel
*sch
;
330 if (!cdev
->online
|| !cdev
->drv
)
333 if (cdev
->drv
->set_offline
) {
334 ret
= cdev
->drv
->set_offline(cdev
);
339 spin_lock_irq(cdev
->ccwlock
);
340 sch
= to_subchannel(cdev
->dev
.parent
);
341 /* Wait until a final state or DISCONNECTED is reached */
342 while (!dev_fsm_final_state(cdev
) &&
343 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
344 spin_unlock_irq(cdev
->ccwlock
);
345 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
346 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
347 spin_lock_irq(cdev
->ccwlock
);
350 ret
= ccw_device_offline(cdev
);
353 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
354 "0.%x.%04x\n", ret
, cdev
->private->dev_id
.ssid
,
355 cdev
->private->dev_id
.devno
);
358 state
= cdev
->private->state
;
359 spin_unlock_irq(cdev
->ccwlock
);
360 io_subchannel_quiesce(sch
);
361 spin_lock_irq(cdev
->ccwlock
);
362 cdev
->private->state
= state
;
363 } while (ret
== -EBUSY
);
364 spin_unlock_irq(cdev
->ccwlock
);
365 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
366 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
367 /* Inform the user if set offline failed. */
368 if (cdev
->private->state
== DEV_STATE_BOXED
) {
369 pr_warning("%s: The device entered boxed state while "
370 "being set offline\n", dev_name(&cdev
->dev
));
371 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
372 pr_warning("%s: The device stopped operating while "
373 "being set offline\n", dev_name(&cdev
->dev
));
375 /* Give up reference from ccw_device_set_online(). */
376 put_device(&cdev
->dev
);
380 cdev
->private->state
= DEV_STATE_OFFLINE
;
381 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
382 spin_unlock_irq(cdev
->ccwlock
);
383 /* Give up reference from ccw_device_set_online(). */
384 put_device(&cdev
->dev
);
389 * ccw_device_set_online() - enable a ccw device for I/O
390 * @cdev: target ccw device
392 * This function first enables @cdev and then calls the driver's set_online()
393 * function for @cdev, if given. If set_online() returns an error, @cdev is
396 * %0 on success and a negative error value on failure.
398 * enabled, ccw device lock not held
400 int ccw_device_set_online(struct ccw_device
*cdev
)
407 if (cdev
->online
|| !cdev
->drv
)
409 /* Hold on to an extra reference while device is online. */
410 if (!get_device(&cdev
->dev
))
413 spin_lock_irq(cdev
->ccwlock
);
414 ret
= ccw_device_online(cdev
);
415 spin_unlock_irq(cdev
->ccwlock
);
417 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
419 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
420 "device 0.%x.%04x\n",
421 ret
, cdev
->private->dev_id
.ssid
,
422 cdev
->private->dev_id
.devno
);
423 /* Give up online reference since onlining failed. */
424 put_device(&cdev
->dev
);
427 spin_lock_irq(cdev
->ccwlock
);
428 /* Check if online processing was successful */
429 if ((cdev
->private->state
!= DEV_STATE_ONLINE
) &&
430 (cdev
->private->state
!= DEV_STATE_W4SENSE
)) {
431 spin_unlock_irq(cdev
->ccwlock
);
432 /* Inform the user that set online failed. */
433 if (cdev
->private->state
== DEV_STATE_BOXED
) {
434 pr_warning("%s: Setting the device online failed "
435 "because it is boxed\n",
436 dev_name(&cdev
->dev
));
437 } else if (cdev
->private->state
== DEV_STATE_NOT_OPER
) {
438 pr_warning("%s: Setting the device online failed "
439 "because it is not operational\n",
440 dev_name(&cdev
->dev
));
442 /* Give up online reference since onlining failed. */
443 put_device(&cdev
->dev
);
446 spin_unlock_irq(cdev
->ccwlock
);
447 if (cdev
->drv
->set_online
)
448 ret
= cdev
->drv
->set_online(cdev
);
455 spin_lock_irq(cdev
->ccwlock
);
456 /* Wait until a final state or DISCONNECTED is reached */
457 while (!dev_fsm_final_state(cdev
) &&
458 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
459 spin_unlock_irq(cdev
->ccwlock
);
460 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
461 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
462 spin_lock_irq(cdev
->ccwlock
);
464 ret2
= ccw_device_offline(cdev
);
467 spin_unlock_irq(cdev
->ccwlock
);
468 wait_event(cdev
->private->wait_q
, (dev_fsm_final_state(cdev
) ||
469 cdev
->private->state
== DEV_STATE_DISCONNECTED
));
470 /* Give up online reference since onlining failed. */
471 put_device(&cdev
->dev
);
475 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
476 "device 0.%x.%04x\n",
477 ret2
, cdev
->private->dev_id
.ssid
,
478 cdev
->private->dev_id
.devno
);
479 cdev
->private->state
= DEV_STATE_OFFLINE
;
480 spin_unlock_irq(cdev
->ccwlock
);
481 /* Give up online reference since onlining failed. */
482 put_device(&cdev
->dev
);
486 static int online_store_handle_offline(struct ccw_device
*cdev
)
488 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
) {
489 spin_lock_irq(cdev
->ccwlock
);
490 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG_EVAL
);
491 spin_unlock_irq(cdev
->ccwlock
);
494 if (cdev
->drv
&& cdev
->drv
->set_offline
)
495 return ccw_device_set_offline(cdev
);
499 static int online_store_recog_and_online(struct ccw_device
*cdev
)
501 /* Do device recognition, if needed. */
502 if (cdev
->private->state
== DEV_STATE_BOXED
) {
503 spin_lock_irq(cdev
->ccwlock
);
504 ccw_device_recognition(cdev
);
505 spin_unlock_irq(cdev
->ccwlock
);
506 wait_event(cdev
->private->wait_q
,
507 cdev
->private->flags
.recog_done
);
508 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
509 /* recognition failed */
512 if (cdev
->drv
&& cdev
->drv
->set_online
)
513 return ccw_device_set_online(cdev
);
517 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
521 ret
= online_store_recog_and_online(cdev
);
524 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
525 ret
= ccw_device_stlck(cdev
);
528 if (cdev
->id
.cu_type
== 0)
529 cdev
->private->state
= DEV_STATE_NOT_OPER
;
530 ret
= online_store_recog_and_online(cdev
);
537 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
538 const char *buf
, size_t count
)
540 struct ccw_device
*cdev
= to_ccwdev(dev
);
544 /* Prevent conflict between multiple on-/offline processing requests. */
545 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
547 /* Prevent conflict between internal I/Os and on-/offline processing. */
548 if (!dev_fsm_final_state(cdev
) &&
549 cdev
->private->state
!= DEV_STATE_DISCONNECTED
) {
553 /* Prevent conflict between pending work and on-/offline processing.*/
554 if (work_pending(&cdev
->private->todo_work
)) {
559 if (cdev
->drv
&& !try_module_get(cdev
->drv
->driver
.owner
)) {
563 if (!strncmp(buf
, "force\n", count
)) {
569 ret
= strict_strtoul(buf
, 16, &i
);
575 ret
= online_store_handle_offline(cdev
);
578 ret
= online_store_handle_online(cdev
, force
);
585 module_put(cdev
->drv
->driver
.owner
);
587 atomic_set(&cdev
->private->onoff
, 0);
588 return (ret
< 0) ? ret
: count
;
592 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
594 struct ccw_device
*cdev
= to_ccwdev(dev
);
595 struct subchannel
*sch
;
597 if (ccw_device_is_orphan(cdev
))
598 return sprintf(buf
, "no device\n");
599 switch (cdev
->private->state
) {
600 case DEV_STATE_BOXED
:
601 return sprintf(buf
, "boxed\n");
602 case DEV_STATE_DISCONNECTED
:
603 case DEV_STATE_DISCONNECTED_SENSE_ID
:
604 case DEV_STATE_NOT_OPER
:
605 sch
= to_subchannel(dev
->parent
);
607 return sprintf(buf
, "no path\n");
609 return sprintf(buf
, "no device\n");
611 /* All other states considered fine. */
612 return sprintf(buf
, "good\n");
617 initiate_logging(struct device
*dev
, struct device_attribute
*attr
,
618 const char *buf
, size_t count
)
620 struct subchannel
*sch
= to_subchannel(dev
);
623 rc
= chsc_siosl(sch
->schid
);
625 pr_warning("Logging for subchannel 0.%x.%04x failed with "
627 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
630 pr_notice("Logging for subchannel 0.%x.%04x was triggered\n",
631 sch
->schid
.ssid
, sch
->schid
.sch_no
);
635 static ssize_t
vpm_show(struct device
*dev
, struct device_attribute
*attr
,
638 struct subchannel
*sch
= to_subchannel(dev
);
640 return sprintf(buf
, "%02x\n", sch
->vpm
);
643 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
644 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
645 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
646 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
647 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
648 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
649 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
650 static DEVICE_ATTR(logging
, 0200, NULL
, initiate_logging
);
651 static DEVICE_ATTR(vpm
, 0444, vpm_show
, NULL
);
653 static struct attribute
*io_subchannel_attrs
[] = {
654 &dev_attr_chpids
.attr
,
655 &dev_attr_pimpampom
.attr
,
656 &dev_attr_logging
.attr
,
661 static struct attribute_group io_subchannel_attr_group
= {
662 .attrs
= io_subchannel_attrs
,
665 static struct attribute
* ccwdev_attrs
[] = {
666 &dev_attr_devtype
.attr
,
667 &dev_attr_cutype
.attr
,
668 &dev_attr_modalias
.attr
,
669 &dev_attr_online
.attr
,
670 &dev_attr_cmb_enable
.attr
,
671 &dev_attr_availability
.attr
,
675 static struct attribute_group ccwdev_attr_group
= {
676 .attrs
= ccwdev_attrs
,
679 static const struct attribute_group
*ccwdev_attr_groups
[] = {
684 /* this is a simple abstraction for device_register that sets the
685 * correct bus type and adds the bus specific files */
686 static int ccw_device_register(struct ccw_device
*cdev
)
688 struct device
*dev
= &cdev
->dev
;
691 dev
->bus
= &ccw_bus_type
;
692 ret
= dev_set_name(&cdev
->dev
, "0.%x.%04x", cdev
->private->dev_id
.ssid
,
693 cdev
->private->dev_id
.devno
);
696 return device_add(dev
);
699 static int match_dev_id(struct device
*dev
, void *data
)
701 struct ccw_device
*cdev
= to_ccwdev(dev
);
702 struct ccw_dev_id
*dev_id
= data
;
704 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
708 * get_ccwdev_by_dev_id() - obtain device from a ccw device id
709 * @dev_id: id of the device to be searched
711 * This function searches all devices attached to the ccw bus for a device
714 * If a device is found its reference count is increased and returned;
715 * else %NULL is returned.
717 struct ccw_device
*get_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
)
721 dev
= bus_find_device(&ccw_bus_type
, NULL
, dev_id
, match_dev_id
);
723 return dev
? to_ccwdev(dev
) : NULL
;
725 EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id
);
727 static void ccw_device_do_unbind_bind(struct ccw_device
*cdev
)
731 if (device_is_registered(&cdev
->dev
)) {
732 device_release_driver(&cdev
->dev
);
733 ret
= device_attach(&cdev
->dev
);
734 WARN_ON(ret
== -ENODEV
);
739 ccw_device_release(struct device
*dev
)
741 struct ccw_device
*cdev
;
743 cdev
= to_ccwdev(dev
);
744 /* Release reference of parent subchannel. */
745 put_device(cdev
->dev
.parent
);
746 kfree(cdev
->private);
750 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
752 struct ccw_device
*cdev
;
754 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
756 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
757 GFP_KERNEL
| GFP_DMA
);
762 return ERR_PTR(-ENOMEM
);
765 static void ccw_device_todo(struct work_struct
*work
);
767 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
768 struct ccw_device
*cdev
)
770 cdev
->private->cdev
= cdev
;
771 cdev
->private->int_class
= IRQIO_CIO
;
772 atomic_set(&cdev
->private->onoff
, 0);
773 cdev
->dev
.parent
= &sch
->dev
;
774 cdev
->dev
.release
= ccw_device_release
;
775 INIT_WORK(&cdev
->private->todo_work
, ccw_device_todo
);
776 cdev
->dev
.groups
= ccwdev_attr_groups
;
777 /* Do first half of device_register. */
778 device_initialize(&cdev
->dev
);
779 if (!get_device(&sch
->dev
)) {
780 /* Release reference from device_initialize(). */
781 put_device(&cdev
->dev
);
784 cdev
->private->flags
.initialized
= 1;
788 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
790 struct ccw_device
*cdev
;
793 cdev
= io_subchannel_allocate_dev(sch
);
795 ret
= io_subchannel_initialize_dev(sch
, cdev
);
802 static void io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
804 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
806 struct ccw_device
*cdev
;
808 /* Need to allocate a new ccw device. */
809 cdev
= io_subchannel_create_ccwdev(sch
);
811 /* OK, we did everything we could... */
812 css_sch_device_unregister(sch
);
815 /* Start recognition for the new ccw device. */
816 io_subchannel_recog(cdev
, sch
);
820 * Register recognized device.
822 static void io_subchannel_register(struct ccw_device
*cdev
)
824 struct subchannel
*sch
;
825 int ret
, adjust_init_count
= 1;
828 sch
= to_subchannel(cdev
->dev
.parent
);
830 * Check if subchannel is still registered. It may have become
831 * unregistered if a machine check hit us after finishing
832 * device recognition but before the register work could be
835 if (!device_is_registered(&sch
->dev
))
837 css_update_ssd_info(sch
);
839 * io_subchannel_register() will also be called after device
840 * recognition has been done for a boxed device (which will already
841 * be registered). We need to reprobe since we may now have sense id
844 if (device_is_registered(&cdev
->dev
)) {
846 ret
= device_reprobe(&cdev
->dev
);
848 /* We can't do much here. */
849 CIO_MSG_EVENT(0, "device_reprobe() returned"
850 " %d for 0.%x.%04x\n", ret
,
851 cdev
->private->dev_id
.ssid
,
852 cdev
->private->dev_id
.devno
);
854 adjust_init_count
= 0;
858 * Now we know this subchannel will stay, we can throw
859 * our delayed uevent.
861 dev_set_uevent_suppress(&sch
->dev
, 0);
862 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
863 /* make it known to the system */
864 ret
= ccw_device_register(cdev
);
866 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
867 cdev
->private->dev_id
.ssid
,
868 cdev
->private->dev_id
.devno
, ret
);
869 spin_lock_irqsave(sch
->lock
, flags
);
870 sch_set_cdev(sch
, NULL
);
871 spin_unlock_irqrestore(sch
->lock
, flags
);
872 /* Release initial device reference. */
873 put_device(&cdev
->dev
);
877 cdev
->private->flags
.recog_done
= 1;
878 wake_up(&cdev
->private->wait_q
);
880 if (adjust_init_count
&& atomic_dec_and_test(&ccw_device_init_count
))
881 wake_up(&ccw_device_init_wq
);
884 static void ccw_device_call_sch_unregister(struct ccw_device
*cdev
)
886 struct subchannel
*sch
;
888 /* Get subchannel reference for local processing. */
889 if (!get_device(cdev
->dev
.parent
))
891 sch
= to_subchannel(cdev
->dev
.parent
);
892 css_sch_device_unregister(sch
);
893 /* Release subchannel reference for local processing. */
894 put_device(&sch
->dev
);
898 * subchannel recognition done. Called from the state machine.
901 io_subchannel_recog_done(struct ccw_device
*cdev
)
903 if (css_init_done
== 0) {
904 cdev
->private->flags
.recog_done
= 1;
907 switch (cdev
->private->state
) {
908 case DEV_STATE_BOXED
:
909 /* Device did not respond in time. */
910 case DEV_STATE_NOT_OPER
:
911 cdev
->private->flags
.recog_done
= 1;
912 /* Remove device found not operational. */
913 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
914 if (atomic_dec_and_test(&ccw_device_init_count
))
915 wake_up(&ccw_device_init_wq
);
917 case DEV_STATE_OFFLINE
:
919 * We can't register the device in interrupt context so
920 * we schedule a work item.
922 ccw_device_sched_todo(cdev
, CDEV_TODO_REGISTER
);
927 static void io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
929 struct ccw_device_private
*priv
;
931 cdev
->ccwlock
= sch
->lock
;
933 /* Init private data. */
934 priv
= cdev
->private;
935 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
936 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
937 priv
->schid
= sch
->schid
;
938 priv
->state
= DEV_STATE_NOT_OPER
;
939 INIT_LIST_HEAD(&priv
->cmb_list
);
940 init_waitqueue_head(&priv
->wait_q
);
941 init_timer(&priv
->timer
);
943 /* Increase counter of devices currently in recognition. */
944 atomic_inc(&ccw_device_init_count
);
946 /* Start async. device sensing. */
947 spin_lock_irq(sch
->lock
);
948 sch_set_cdev(sch
, cdev
);
949 ccw_device_recognition(cdev
);
950 spin_unlock_irq(sch
->lock
);
953 static int ccw_device_move_to_sch(struct ccw_device
*cdev
,
954 struct subchannel
*sch
)
956 struct subchannel
*old_sch
;
957 int rc
, old_enabled
= 0;
959 old_sch
= to_subchannel(cdev
->dev
.parent
);
960 /* Obtain child reference for new parent. */
961 if (!get_device(&sch
->dev
))
964 if (!sch_is_pseudo_sch(old_sch
)) {
965 spin_lock_irq(old_sch
->lock
);
966 old_enabled
= old_sch
->schib
.pmcw
.ena
;
969 rc
= cio_disable_subchannel(old_sch
);
970 spin_unlock_irq(old_sch
->lock
);
972 /* Release child reference for new parent. */
973 put_device(&sch
->dev
);
978 mutex_lock(&sch
->reg_mutex
);
979 rc
= device_move(&cdev
->dev
, &sch
->dev
, DPM_ORDER_PARENT_BEFORE_DEV
);
980 mutex_unlock(&sch
->reg_mutex
);
982 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
983 cdev
->private->dev_id
.ssid
,
984 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
985 sch
->schib
.pmcw
.dev
, rc
);
987 /* Try to reenable the old subchannel. */
988 spin_lock_irq(old_sch
->lock
);
989 cio_enable_subchannel(old_sch
, (u32
)(addr_t
)old_sch
);
990 spin_unlock_irq(old_sch
->lock
);
992 /* Release child reference for new parent. */
993 put_device(&sch
->dev
);
996 /* Clean up old subchannel. */
997 if (!sch_is_pseudo_sch(old_sch
)) {
998 spin_lock_irq(old_sch
->lock
);
999 sch_set_cdev(old_sch
, NULL
);
1000 spin_unlock_irq(old_sch
->lock
);
1001 css_schedule_eval(old_sch
->schid
);
1003 /* Release child reference for old parent. */
1004 put_device(&old_sch
->dev
);
1005 /* Initialize new subchannel. */
1006 spin_lock_irq(sch
->lock
);
1007 cdev
->private->schid
= sch
->schid
;
1008 cdev
->ccwlock
= sch
->lock
;
1009 if (!sch_is_pseudo_sch(sch
))
1010 sch_set_cdev(sch
, cdev
);
1011 spin_unlock_irq(sch
->lock
);
1012 if (!sch_is_pseudo_sch(sch
))
1013 css_update_ssd_info(sch
);
1017 static int ccw_device_move_to_orph(struct ccw_device
*cdev
)
1019 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1020 struct channel_subsystem
*css
= to_css(sch
->dev
.parent
);
1022 return ccw_device_move_to_sch(cdev
, css
->pseudo_subchannel
);
1025 static void io_subchannel_irq(struct subchannel
*sch
)
1027 struct ccw_device
*cdev
;
1029 cdev
= sch_get_cdev(sch
);
1031 CIO_TRACE_EVENT(6, "IRQ");
1032 CIO_TRACE_EVENT(6, dev_name(&sch
->dev
));
1034 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1036 inc_irq_stat(IRQIO_CIO
);
1039 void io_subchannel_init_config(struct subchannel
*sch
)
1041 memset(&sch
->config
, 0, sizeof(sch
->config
));
1042 sch
->config
.csense
= 1;
1045 static void io_subchannel_init_fields(struct subchannel
*sch
)
1047 if (cio_is_console(sch
->schid
))
1050 sch
->opm
= chp_get_sch_opm(sch
);
1051 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1052 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1054 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1055 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1056 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1057 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1058 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1060 io_subchannel_init_config(sch
);
1064 * Note: We always return 0 so that we bind to the device even on error.
1065 * This is needed so that our remove function is called on unregister.
1067 static int io_subchannel_probe(struct subchannel
*sch
)
1069 struct io_subchannel_private
*io_priv
;
1070 struct ccw_device
*cdev
;
1073 if (cio_is_console(sch
->schid
)) {
1074 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1075 &io_subchannel_attr_group
);
1077 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1078 "attributes for subchannel "
1079 "0.%x.%04x (rc=%d)\n",
1080 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1082 * The console subchannel already has an associated ccw_device.
1083 * Throw the delayed uevent for the subchannel, register
1084 * the ccw_device and exit.
1086 dev_set_uevent_suppress(&sch
->dev
, 0);
1087 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1088 cdev
= sch_get_cdev(sch
);
1089 cdev
->dev
.groups
= ccwdev_attr_groups
;
1090 device_initialize(&cdev
->dev
);
1091 cdev
->private->flags
.initialized
= 1;
1092 ccw_device_register(cdev
);
1094 * Check if the device is already online. If it is
1095 * the reference count needs to be corrected since we
1096 * didn't obtain a reference in ccw_device_set_online.
1098 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1099 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1100 cdev
->private->state
!= DEV_STATE_BOXED
)
1101 get_device(&cdev
->dev
);
1104 io_subchannel_init_fields(sch
);
1105 rc
= cio_commit_config(sch
);
1108 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1109 &io_subchannel_attr_group
);
1112 /* Allocate I/O subchannel private data. */
1113 io_priv
= kzalloc(sizeof(*io_priv
), GFP_KERNEL
| GFP_DMA
);
1117 set_io_private(sch
, io_priv
);
1118 css_schedule_eval(sch
->schid
);
1122 spin_lock_irq(sch
->lock
);
1123 css_sched_sch_todo(sch
, SCH_TODO_UNREG
);
1124 spin_unlock_irq(sch
->lock
);
1129 io_subchannel_remove (struct subchannel
*sch
)
1131 struct io_subchannel_private
*io_priv
= to_io_private(sch
);
1132 struct ccw_device
*cdev
;
1134 cdev
= sch_get_cdev(sch
);
1137 io_subchannel_quiesce(sch
);
1138 /* Set ccw device to not operational and drop reference. */
1139 spin_lock_irq(cdev
->ccwlock
);
1140 sch_set_cdev(sch
, NULL
);
1141 set_io_private(sch
, NULL
);
1142 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1143 spin_unlock_irq(cdev
->ccwlock
);
1144 ccw_device_unregister(cdev
);
1147 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1151 static void io_subchannel_verify(struct subchannel
*sch
)
1153 struct ccw_device
*cdev
;
1155 cdev
= sch_get_cdev(sch
);
1157 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1160 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1162 struct ccw_device
*cdev
;
1164 cdev
= sch_get_cdev(sch
);
1167 if (cio_update_schib(sch
))
1169 /* Check for I/O on path. */
1170 if (scsw_actl(&sch
->schib
.scsw
) == 0 || sch
->schib
.pmcw
.lpum
!= mask
)
1172 if (cdev
->private->state
== DEV_STATE_ONLINE
) {
1173 ccw_device_kill_io(cdev
);
1179 /* Trigger path verification. */
1180 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1184 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1187 static int io_subchannel_chp_event(struct subchannel
*sch
,
1188 struct chp_link
*link
, int event
)
1190 struct ccw_device
*cdev
= sch_get_cdev(sch
);
1193 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1201 cdev
->private->path_gone_mask
|= mask
;
1202 io_subchannel_terminate_path(sch
, mask
);
1208 cdev
->private->path_new_mask
|= mask
;
1209 io_subchannel_verify(sch
);
1212 if (cio_update_schib(sch
))
1215 cdev
->private->path_gone_mask
|= mask
;
1216 io_subchannel_terminate_path(sch
, mask
);
1219 if (cio_update_schib(sch
))
1221 sch
->lpm
|= mask
& sch
->opm
;
1223 cdev
->private->path_new_mask
|= mask
;
1224 io_subchannel_verify(sch
);
1230 static void io_subchannel_quiesce(struct subchannel
*sch
)
1232 struct ccw_device
*cdev
;
1235 spin_lock_irq(sch
->lock
);
1236 cdev
= sch_get_cdev(sch
);
1237 if (cio_is_console(sch
->schid
))
1239 if (!sch
->schib
.pmcw
.ena
)
1241 ret
= cio_disable_subchannel(sch
);
1245 cdev
->handler(cdev
, cdev
->private->intparm
, ERR_PTR(-EIO
));
1246 while (ret
== -EBUSY
) {
1247 cdev
->private->state
= DEV_STATE_QUIESCE
;
1248 cdev
->private->iretry
= 255;
1249 ret
= ccw_device_cancel_halt_clear(cdev
);
1250 if (ret
== -EBUSY
) {
1251 ccw_device_set_timeout(cdev
, HZ
/10);
1252 spin_unlock_irq(sch
->lock
);
1253 wait_event(cdev
->private->wait_q
,
1254 cdev
->private->state
!= DEV_STATE_QUIESCE
);
1255 spin_lock_irq(sch
->lock
);
1257 ret
= cio_disable_subchannel(sch
);
1260 spin_unlock_irq(sch
->lock
);
1263 static void io_subchannel_shutdown(struct subchannel
*sch
)
1265 io_subchannel_quiesce(sch
);
1268 static int device_is_disconnected(struct ccw_device
*cdev
)
1272 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1273 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1276 static int recovery_check(struct device
*dev
, void *data
)
1278 struct ccw_device
*cdev
= to_ccwdev(dev
);
1281 spin_lock_irq(cdev
->ccwlock
);
1282 switch (cdev
->private->state
) {
1283 case DEV_STATE_DISCONNECTED
:
1284 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1285 cdev
->private->dev_id
.ssid
,
1286 cdev
->private->dev_id
.devno
);
1287 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1290 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1294 spin_unlock_irq(cdev
->ccwlock
);
1299 static void recovery_work_func(struct work_struct
*unused
)
1303 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1305 spin_lock_irq(&recovery_lock
);
1306 if (!timer_pending(&recovery_timer
)) {
1307 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1309 mod_timer(&recovery_timer
, jiffies
+
1310 recovery_delay
[recovery_phase
] * HZ
);
1312 spin_unlock_irq(&recovery_lock
);
1314 CIO_MSG_EVENT(4, "recovery: end\n");
1317 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1319 static void recovery_func(unsigned long data
)
1322 * We can't do our recovery in softirq context and it's not
1323 * performance critical, so we schedule it.
1325 schedule_work(&recovery_work
);
1328 static void ccw_device_schedule_recovery(void)
1330 unsigned long flags
;
1332 CIO_MSG_EVENT(4, "recovery: schedule\n");
1333 spin_lock_irqsave(&recovery_lock
, flags
);
1334 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1336 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1338 spin_unlock_irqrestore(&recovery_lock
, flags
);
1341 static int purge_fn(struct device
*dev
, void *data
)
1343 struct ccw_device
*cdev
= to_ccwdev(dev
);
1344 struct ccw_dev_id
*id
= &cdev
->private->dev_id
;
1346 spin_lock_irq(cdev
->ccwlock
);
1347 if (is_blacklisted(id
->ssid
, id
->devno
) &&
1348 (cdev
->private->state
== DEV_STATE_OFFLINE
) &&
1349 (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) == 0)) {
1350 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id
->ssid
,
1352 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1353 atomic_set(&cdev
->private->onoff
, 0);
1355 spin_unlock_irq(cdev
->ccwlock
);
1356 /* Abort loop in case of pending signal. */
1357 if (signal_pending(current
))
1364 * ccw_purge_blacklisted - purge unused, blacklisted devices
1366 * Unregister all ccw devices that are offline and on the blacklist.
1368 int ccw_purge_blacklisted(void)
1370 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1371 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1375 void ccw_device_set_disconnected(struct ccw_device
*cdev
)
1379 ccw_device_set_timeout(cdev
, 0);
1380 cdev
->private->flags
.fake_irb
= 0;
1381 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1383 ccw_device_schedule_recovery();
1386 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1388 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1390 CIO_TRACE_EVENT(2, "notoper");
1391 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1392 ccw_device_set_timeout(cdev
, 0);
1393 cio_disable_subchannel(sch
);
1394 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1397 enum io_sch_action
{
1401 IO_SCH_UNREG_ATTACH
,
1409 static enum io_sch_action
sch_get_action(struct subchannel
*sch
)
1411 struct ccw_device
*cdev
;
1413 cdev
= sch_get_cdev(sch
);
1414 if (cio_update_schib(sch
)) {
1415 /* Not operational. */
1417 return IO_SCH_UNREG
;
1418 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1419 return IO_SCH_UNREG
;
1420 return IO_SCH_ORPH_UNREG
;
1424 return IO_SCH_ATTACH
;
1425 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1426 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
1427 return IO_SCH_UNREG_ATTACH
;
1428 return IO_SCH_ORPH_ATTACH
;
1430 if ((sch
->schib
.pmcw
.pam
& sch
->opm
) == 0) {
1431 if (ccw_device_notify(cdev
, CIO_NO_PATH
) != NOTIFY_OK
)
1432 return IO_SCH_UNREG
;
1435 if (device_is_disconnected(cdev
))
1436 return IO_SCH_REPROBE
;
1437 if (cdev
->online
&& !cdev
->private->flags
.resuming
)
1438 return IO_SCH_VERIFY
;
1439 if (cdev
->private->state
== DEV_STATE_NOT_OPER
)
1440 return IO_SCH_UNREG_ATTACH
;
1445 * io_subchannel_sch_event - process subchannel event
1447 * @process: non-zero if function is called in process context
1449 * An unspecified event occurred for this subchannel. Adjust data according
1450 * to the current operational state of the subchannel and device. Return
1451 * zero when the event has been handled sufficiently or -EAGAIN when this
1452 * function should be called again in process context.
1454 static int io_subchannel_sch_event(struct subchannel
*sch
, int process
)
1456 unsigned long flags
;
1457 struct ccw_device
*cdev
;
1458 struct ccw_dev_id dev_id
;
1459 enum io_sch_action action
;
1462 spin_lock_irqsave(sch
->lock
, flags
);
1463 if (!device_is_registered(&sch
->dev
))
1465 if (work_pending(&sch
->todo_work
))
1467 cdev
= sch_get_cdev(sch
);
1468 if (cdev
&& work_pending(&cdev
->private->todo_work
))
1470 action
= sch_get_action(sch
);
1471 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1472 sch
->schid
.ssid
, sch
->schid
.sch_no
, process
,
1474 /* Perform immediate actions while holding the lock. */
1476 case IO_SCH_REPROBE
:
1477 /* Trigger device recognition. */
1478 ccw_device_trigger_reprobe(cdev
);
1482 /* Trigger path verification. */
1483 io_subchannel_verify(sch
);
1487 ccw_device_set_disconnected(cdev
);
1490 case IO_SCH_ORPH_UNREG
:
1491 case IO_SCH_ORPH_ATTACH
:
1492 ccw_device_set_disconnected(cdev
);
1494 case IO_SCH_UNREG_ATTACH
:
1498 if (cdev
->private->state
== DEV_STATE_SENSE_ID
) {
1500 * Note: delayed work triggered by this event
1501 * and repeated calls to sch_event are synchronized
1502 * by the above check for work_pending(cdev).
1504 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1506 ccw_device_set_notoper(cdev
);
1514 spin_unlock_irqrestore(sch
->lock
, flags
);
1515 /* All other actions require process context. */
1518 /* Handle attached ccw device. */
1520 case IO_SCH_ORPH_UNREG
:
1521 case IO_SCH_ORPH_ATTACH
:
1522 /* Move ccw device to orphanage. */
1523 rc
= ccw_device_move_to_orph(cdev
);
1527 case IO_SCH_UNREG_ATTACH
:
1528 spin_lock_irqsave(sch
->lock
, flags
);
1529 if (cdev
->private->flags
.resuming
) {
1530 /* Device will be handled later. */
1534 sch_set_cdev(sch
, NULL
);
1535 spin_unlock_irqrestore(sch
->lock
, flags
);
1536 /* Unregister ccw device. */
1537 ccw_device_unregister(cdev
);
1542 /* Handle subchannel. */
1544 case IO_SCH_ORPH_UNREG
:
1546 if (!cdev
|| !cdev
->private->flags
.resuming
)
1547 css_sch_device_unregister(sch
);
1549 case IO_SCH_ORPH_ATTACH
:
1550 case IO_SCH_UNREG_ATTACH
:
1552 dev_id
.ssid
= sch
->schid
.ssid
;
1553 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1554 cdev
= get_ccwdev_by_dev_id(&dev_id
);
1556 sch_create_and_recog_new_device(sch
);
1559 rc
= ccw_device_move_to_sch(cdev
, sch
);
1561 /* Release reference from get_ccwdev_by_dev_id() */
1562 put_device(&cdev
->dev
);
1565 spin_lock_irqsave(sch
->lock
, flags
);
1566 ccw_device_trigger_reprobe(cdev
);
1567 spin_unlock_irqrestore(sch
->lock
, flags
);
1568 /* Release reference from get_ccwdev_by_dev_id() */
1569 put_device(&cdev
->dev
);
1577 spin_unlock_irqrestore(sch
->lock
, flags
);
1582 #ifdef CONFIG_CCW_CONSOLE
1583 static struct ccw_device console_cdev
;
1584 static struct ccw_device_private console_private
;
1585 static int console_cdev_in_use
;
1587 static DEFINE_SPINLOCK(ccw_console_lock
);
1589 spinlock_t
* cio_get_console_lock(void)
1591 return &ccw_console_lock
;
1594 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1595 struct subchannel
*sch
)
1597 struct io_subchannel_private
*io_priv
= cio_get_console_priv();
1600 /* Attach subchannel private data. */
1601 memset(io_priv
, 0, sizeof(*io_priv
));
1602 set_io_private(sch
, io_priv
);
1603 io_subchannel_init_fields(sch
);
1604 rc
= cio_commit_config(sch
);
1607 sch
->driver
= &io_subchannel_driver
;
1608 /* Initialize the ccw_device structure. */
1609 cdev
->dev
.parent
= &sch
->dev
;
1610 sch_set_cdev(sch
, cdev
);
1611 io_subchannel_recog(cdev
, sch
);
1612 /* Now wait for the async. recognition to come to an end. */
1613 spin_lock_irq(cdev
->ccwlock
);
1614 while (!dev_fsm_final_state(cdev
))
1617 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1619 ccw_device_online(cdev
);
1620 while (!dev_fsm_final_state(cdev
))
1622 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1626 spin_unlock_irq(cdev
->ccwlock
);
1631 ccw_device_probe_console(void)
1633 struct subchannel
*sch
;
1636 if (xchg(&console_cdev_in_use
, 1) != 0)
1637 return ERR_PTR(-EBUSY
);
1638 sch
= cio_probe_console();
1640 console_cdev_in_use
= 0;
1641 return (void *) sch
;
1643 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1644 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1645 console_cdev
.private = &console_private
;
1646 console_private
.cdev
= &console_cdev
;
1647 console_private
.int_class
= IRQIO_CIO
;
1648 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1650 cio_release_console();
1651 console_cdev_in_use
= 0;
1652 return ERR_PTR(ret
);
1654 console_cdev
.online
= 1;
1655 return &console_cdev
;
1658 static int ccw_device_pm_restore(struct device
*dev
);
1660 int ccw_device_force_console(void)
1662 if (!console_cdev_in_use
)
1664 return ccw_device_pm_restore(&console_cdev
.dev
);
1666 EXPORT_SYMBOL_GPL(ccw_device_force_console
);
1670 * get ccw_device matching the busid, but only if owned by cdrv
1673 __ccwdev_check_busid(struct device
*dev
, void *id
)
1679 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1684 * get_ccwdev_by_busid() - obtain device from a bus id
1685 * @cdrv: driver the device is owned by
1686 * @bus_id: bus id of the device to be searched
1688 * This function searches all devices owned by @cdrv for a device with a bus
1689 * id matching @bus_id.
1691 * If a match is found, its reference count of the found device is increased
1692 * and it is returned; else %NULL is returned.
1694 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1699 dev
= driver_find_device(&cdrv
->driver
, NULL
, (void *)bus_id
,
1700 __ccwdev_check_busid
);
1702 return dev
? to_ccwdev(dev
) : NULL
;
1705 /************************** device driver handling ************************/
1707 /* This is the implementation of the ccw_driver class. The probe, remove
1708 * and release methods are initially very similar to the device_driver
1709 * implementations, with the difference that they have ccw_device
1712 * A ccw driver also contains the information that is needed for
1716 ccw_device_probe (struct device
*dev
)
1718 struct ccw_device
*cdev
= to_ccwdev(dev
);
1719 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1722 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1723 /* Note: we interpret class 0 in this context as an uninitialized
1724 * field since it translates to a non-I/O interrupt class. */
1725 if (cdrv
->int_class
!= 0)
1726 cdev
->private->int_class
= cdrv
->int_class
;
1728 cdev
->private->int_class
= IRQIO_CIO
;
1730 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1734 cdev
->private->int_class
= IRQIO_CIO
;
1742 ccw_device_remove (struct device
*dev
)
1744 struct ccw_device
*cdev
= to_ccwdev(dev
);
1745 struct ccw_driver
*cdrv
= cdev
->drv
;
1752 spin_lock_irq(cdev
->ccwlock
);
1753 ret
= ccw_device_offline(cdev
);
1754 spin_unlock_irq(cdev
->ccwlock
);
1756 wait_event(cdev
->private->wait_q
,
1757 dev_fsm_final_state(cdev
));
1759 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1760 "device 0.%x.%04x\n",
1761 ret
, cdev
->private->dev_id
.ssid
,
1762 cdev
->private->dev_id
.devno
);
1763 /* Give up reference obtained in ccw_device_set_online(). */
1764 put_device(&cdev
->dev
);
1766 ccw_device_set_timeout(cdev
, 0);
1768 cdev
->private->int_class
= IRQIO_CIO
;
1772 static void ccw_device_shutdown(struct device
*dev
)
1774 struct ccw_device
*cdev
;
1776 cdev
= to_ccwdev(dev
);
1777 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1778 cdev
->drv
->shutdown(cdev
);
1782 static int ccw_device_pm_prepare(struct device
*dev
)
1784 struct ccw_device
*cdev
= to_ccwdev(dev
);
1786 if (work_pending(&cdev
->private->todo_work
))
1788 /* Fail while device is being set online/offline. */
1789 if (atomic_read(&cdev
->private->onoff
))
1792 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->prepare
)
1793 return cdev
->drv
->prepare(cdev
);
1798 static void ccw_device_pm_complete(struct device
*dev
)
1800 struct ccw_device
*cdev
= to_ccwdev(dev
);
1802 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->complete
)
1803 cdev
->drv
->complete(cdev
);
1806 static int ccw_device_pm_freeze(struct device
*dev
)
1808 struct ccw_device
*cdev
= to_ccwdev(dev
);
1809 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1810 int ret
, cm_enabled
;
1812 /* Fail suspend while device is in transistional state. */
1813 if (!dev_fsm_final_state(cdev
))
1817 if (cdev
->drv
&& cdev
->drv
->freeze
) {
1818 ret
= cdev
->drv
->freeze(cdev
);
1823 spin_lock_irq(sch
->lock
);
1824 cm_enabled
= cdev
->private->cmb
!= NULL
;
1825 spin_unlock_irq(sch
->lock
);
1827 /* Don't have the css write on memory. */
1828 ret
= ccw_set_cmf(cdev
, 0);
1832 /* From here on, disallow device driver I/O. */
1833 spin_lock_irq(sch
->lock
);
1834 ret
= cio_disable_subchannel(sch
);
1835 spin_unlock_irq(sch
->lock
);
1840 static int ccw_device_pm_thaw(struct device
*dev
)
1842 struct ccw_device
*cdev
= to_ccwdev(dev
);
1843 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1844 int ret
, cm_enabled
;
1849 spin_lock_irq(sch
->lock
);
1850 /* Allow device driver I/O again. */
1851 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1852 cm_enabled
= cdev
->private->cmb
!= NULL
;
1853 spin_unlock_irq(sch
->lock
);
1858 ret
= ccw_set_cmf(cdev
, 1);
1863 if (cdev
->drv
&& cdev
->drv
->thaw
)
1864 ret
= cdev
->drv
->thaw(cdev
);
1869 static void __ccw_device_pm_restore(struct ccw_device
*cdev
)
1871 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1873 spin_lock_irq(sch
->lock
);
1874 if (cio_is_console(sch
->schid
)) {
1875 cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
1879 * While we were sleeping, devices may have gone or become
1880 * available again. Kick re-detection.
1882 cdev
->private->flags
.resuming
= 1;
1883 cdev
->private->path_new_mask
= LPM_ANYPATH
;
1884 css_sched_sch_todo(sch
, SCH_TODO_EVAL
);
1885 spin_unlock_irq(sch
->lock
);
1886 css_wait_for_slow_path();
1888 /* cdev may have been moved to a different subchannel. */
1889 sch
= to_subchannel(cdev
->dev
.parent
);
1890 spin_lock_irq(sch
->lock
);
1891 if (cdev
->private->state
!= DEV_STATE_ONLINE
&&
1892 cdev
->private->state
!= DEV_STATE_OFFLINE
)
1895 ccw_device_recognition(cdev
);
1896 spin_unlock_irq(sch
->lock
);
1897 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
) ||
1898 cdev
->private->state
== DEV_STATE_DISCONNECTED
);
1899 spin_lock_irq(sch
->lock
);
1902 cdev
->private->flags
.resuming
= 0;
1903 spin_unlock_irq(sch
->lock
);
1906 static int resume_handle_boxed(struct ccw_device
*cdev
)
1908 cdev
->private->state
= DEV_STATE_BOXED
;
1909 if (ccw_device_notify(cdev
, CIO_BOXED
) == NOTIFY_OK
)
1911 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1915 static int resume_handle_disc(struct ccw_device
*cdev
)
1917 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1918 if (ccw_device_notify(cdev
, CIO_GONE
) == NOTIFY_OK
)
1920 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1924 static int ccw_device_pm_restore(struct device
*dev
)
1926 struct ccw_device
*cdev
= to_ccwdev(dev
);
1927 struct subchannel
*sch
;
1930 __ccw_device_pm_restore(cdev
);
1931 sch
= to_subchannel(cdev
->dev
.parent
);
1932 spin_lock_irq(sch
->lock
);
1933 if (cio_is_console(sch
->schid
))
1936 /* check recognition results */
1937 switch (cdev
->private->state
) {
1938 case DEV_STATE_OFFLINE
:
1939 case DEV_STATE_ONLINE
:
1940 cdev
->private->flags
.donotify
= 0;
1942 case DEV_STATE_BOXED
:
1943 ret
= resume_handle_boxed(cdev
);
1948 ret
= resume_handle_disc(cdev
);
1953 /* check if the device type has changed */
1954 if (!ccw_device_test_sense_data(cdev
)) {
1955 ccw_device_update_sense_data(cdev
);
1956 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
1963 if (ccw_device_online(cdev
)) {
1964 ret
= resume_handle_disc(cdev
);
1969 spin_unlock_irq(sch
->lock
);
1970 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1971 spin_lock_irq(sch
->lock
);
1973 if (ccw_device_notify(cdev
, CIO_OPER
) == NOTIFY_BAD
) {
1974 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
1979 /* reenable cmf, if needed */
1980 if (cdev
->private->cmb
) {
1981 spin_unlock_irq(sch
->lock
);
1982 ret
= ccw_set_cmf(cdev
, 1);
1983 spin_lock_irq(sch
->lock
);
1985 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1986 "(rc=%d)\n", cdev
->private->dev_id
.ssid
,
1987 cdev
->private->dev_id
.devno
, ret
);
1993 spin_unlock_irq(sch
->lock
);
1994 if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->restore
)
1995 ret
= cdev
->drv
->restore(cdev
);
1999 spin_unlock_irq(sch
->lock
);
2003 static const struct dev_pm_ops ccw_pm_ops
= {
2004 .prepare
= ccw_device_pm_prepare
,
2005 .complete
= ccw_device_pm_complete
,
2006 .freeze
= ccw_device_pm_freeze
,
2007 .thaw
= ccw_device_pm_thaw
,
2008 .restore
= ccw_device_pm_restore
,
2011 static struct bus_type ccw_bus_type
= {
2013 .match
= ccw_bus_match
,
2014 .uevent
= ccw_uevent
,
2015 .probe
= ccw_device_probe
,
2016 .remove
= ccw_device_remove
,
2017 .shutdown
= ccw_device_shutdown
,
2022 * ccw_driver_register() - register a ccw driver
2023 * @cdriver: driver to be registered
2025 * This function is mainly a wrapper around driver_register().
2027 * %0 on success and a negative error value on failure.
2029 int ccw_driver_register(struct ccw_driver
*cdriver
)
2031 struct device_driver
*drv
= &cdriver
->driver
;
2033 drv
->bus
= &ccw_bus_type
;
2035 return driver_register(drv
);
2039 * ccw_driver_unregister() - deregister a ccw driver
2040 * @cdriver: driver to be deregistered
2042 * This function is mainly a wrapper around driver_unregister().
2044 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
2046 driver_unregister(&cdriver
->driver
);
2049 static void ccw_device_todo(struct work_struct
*work
)
2051 struct ccw_device_private
*priv
;
2052 struct ccw_device
*cdev
;
2053 struct subchannel
*sch
;
2054 enum cdev_todo todo
;
2056 priv
= container_of(work
, struct ccw_device_private
, todo_work
);
2058 sch
= to_subchannel(cdev
->dev
.parent
);
2059 /* Find out todo. */
2060 spin_lock_irq(cdev
->ccwlock
);
2062 priv
->todo
= CDEV_TODO_NOTHING
;
2063 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
2064 priv
->dev_id
.ssid
, priv
->dev_id
.devno
, todo
);
2065 spin_unlock_irq(cdev
->ccwlock
);
2068 case CDEV_TODO_ENABLE_CMF
:
2071 case CDEV_TODO_REBIND
:
2072 ccw_device_do_unbind_bind(cdev
);
2074 case CDEV_TODO_REGISTER
:
2075 io_subchannel_register(cdev
);
2077 case CDEV_TODO_UNREG_EVAL
:
2078 if (!sch_is_pseudo_sch(sch
))
2079 css_schedule_eval(sch
->schid
);
2081 case CDEV_TODO_UNREG
:
2082 if (sch_is_pseudo_sch(sch
))
2083 ccw_device_unregister(cdev
);
2085 ccw_device_call_sch_unregister(cdev
);
2090 /* Release workqueue ref. */
2091 put_device(&cdev
->dev
);
2095 * ccw_device_sched_todo - schedule ccw device operation
2099 * Schedule the operation identified by @todo to be performed on the slow path
2100 * workqueue. Do nothing if another operation with higher priority is already
2101 * scheduled. Needs to be called with ccwdev lock held.
2103 void ccw_device_sched_todo(struct ccw_device
*cdev
, enum cdev_todo todo
)
2105 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2106 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
2108 if (cdev
->private->todo
>= todo
)
2110 cdev
->private->todo
= todo
;
2111 /* Get workqueue ref. */
2112 if (!get_device(&cdev
->dev
))
2114 if (!queue_work(cio_work_q
, &cdev
->private->todo_work
)) {
2115 /* Already queued, release workqueue ref. */
2116 put_device(&cdev
->dev
);
2121 * ccw_device_siosl() - initiate logging
2124 * This function is used to invoke model-dependent logging within the channel
2127 int ccw_device_siosl(struct ccw_device
*cdev
)
2129 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
2131 return chsc_siosl(sch
->schid
);
2133 EXPORT_SYMBOL_GPL(ccw_device_siosl
);
2135 MODULE_LICENSE("GPL");
2136 EXPORT_SYMBOL(ccw_device_set_online
);
2137 EXPORT_SYMBOL(ccw_device_set_offline
);
2138 EXPORT_SYMBOL(ccw_driver_register
);
2139 EXPORT_SYMBOL(ccw_driver_unregister
);
2140 EXPORT_SYMBOL(get_ccwdev_by_busid
);