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 int io_subchannel_settle(void)
165 ret = wait_event_interruptible(ccw_device_init_wq,
166 atomic_read(&ccw_device_init_count) == 0);
169 flush_workqueue(cio_work_q);
173 static struct css_driver io_subchannel_driver = {
174 .owner = THIS_MODULE,
175 .subchannel_type = io_subchannel_ids,
176 .name = "io_subchannel",
177 .irq = io_subchannel_irq,
178 .sch_event = io_subchannel_sch_event,
179 .chp_event = io_subchannel_chp_event,
180 .probe = io_subchannel_probe,
181 .remove = io_subchannel_remove,
182 .shutdown = io_subchannel_shutdown,
183 .prepare = io_subchannel_prepare,
184 .settle = io_subchannel_settle,
187 int __init io_subchannel_init(void)
191 init_waitqueue_head(&ccw_device_init_wq);
192 atomic_set(&ccw_device_init_count, 0);
193 setup_timer(&recovery_timer, recovery_func, 0);
195 ret = bus_register(&ccw_bus_type);
198 ret = css_driver_register(&io_subchannel_driver);
200 bus_unregister(&ccw_bus_type);
206 /************************ device handling **************************/
209 * A ccw_device has some interfaces in sysfs in addition to the
211 * The following entries are designed to export the information which
212 * resided in 2.4 in /proc/subchannels. Subchannel and device number
213 * are obvious, so they don't have an entry :)
214 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
217 chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
219 struct subchannel *sch = to_subchannel(dev);
220 struct chsc_ssd_info *ssd = &sch->ssd_info;
225 for (chp = 0; chp < 8; chp++) {
227 if (ssd->path_mask & mask)
228 ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
230 ret += sprintf(buf + ret, "00 ");
232 ret += sprintf (buf+ret, "\n");
233 return min((ssize_t)PAGE_SIZE, ret);
237 pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
239 struct subchannel *sch = to_subchannel(dev);
240 struct pmcw *pmcw = &sch->schib.pmcw;
242 return sprintf (buf, "%02x %02x %02x\n",
243 pmcw->pim, pmcw->pam, pmcw->pom);
247 devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
249 struct ccw_device *cdev = to_ccwdev(dev);
250 struct ccw_device_id *id = &(cdev->id);
252 if (id->dev_type != 0)
253 return sprintf(buf, "%04x/%02x\n",
254 id->dev_type, id->dev_model);
256 return sprintf(buf, "n/a\n");
260 cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
262 struct ccw_device *cdev = to_ccwdev(dev);
263 struct ccw_device_id *id = &(cdev->id);
265 return sprintf(buf, "%04x/%02x\n",
266 id->cu_type, id->cu_model);
270 modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
272 struct ccw_device *cdev = to_ccwdev(dev);
273 struct ccw_device_id *id = &(cdev->id);
276 len = snprint_alias(buf, PAGE_SIZE, id, "\n");
278 return len > PAGE_SIZE ? PAGE_SIZE : len;
282 online_show (struct device *dev, struct device_attribute *attr, char *buf)
284 struct ccw_device *cdev = to_ccwdev(dev);
286 return sprintf(buf, cdev->online ? "1\n" : "0\n");
289 int ccw_device_is_orphan(struct ccw_device *cdev)
291 return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
294 static void ccw_device_unregister(struct ccw_device *cdev)
296 if (device_is_registered(&cdev->dev)) {
297 /* Undo device_add(). */
298 device_del(&cdev->dev);
300 if (cdev->private->flags.initialized) {
301 cdev->private->flags.initialized = 0;
302 /* Release reference from device_initialize(). */
303 put_device(&cdev->dev);
307 static void io_subchannel_quiesce(struct subchannel *);
310 * ccw_device_set_offline() - disable a ccw device for I/O
311 * @cdev: target ccw device
313 * This function calls the driver's set_offline() function for @cdev, if
314 * given, and then disables @cdev.
316 * %0 on success and a negative error value on failure.
318 * enabled, ccw device lock not held
320 int ccw_device_set_offline(struct ccw_device *cdev)
322 struct subchannel *sch;
327 if (!cdev->online || !cdev->drv)
330 if (cdev->drv->set_offline) {
331 ret = cdev->drv->set_offline(cdev);
336 spin_lock_irq(cdev->ccwlock);
337 sch = to_subchannel(cdev->dev.parent);
338 /* Wait until a final state or DISCONNECTED is reached */
339 while (!dev_fsm_final_state(cdev) &&
340 cdev->private->state != DEV_STATE_DISCONNECTED) {
341 spin_unlock_irq(cdev->ccwlock);
342 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
343 cdev->private->state == DEV_STATE_DISCONNECTED));
344 spin_lock_irq(cdev->ccwlock);
347 ret = ccw_device_offline(cdev);
350 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
351 "0.%x.%04x\n", ret, cdev->private->dev_id.ssid,
352 cdev->private->dev_id.devno);
355 state = cdev->private->state;
356 spin_unlock_irq(cdev->ccwlock);
357 io_subchannel_quiesce(sch);
358 spin_lock_irq(cdev->ccwlock);
359 cdev->private->state = state;
360 } while (ret == -EBUSY);
361 spin_unlock_irq(cdev->ccwlock);
362 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
363 cdev->private->state == DEV_STATE_DISCONNECTED));
364 /* Inform the user if set offline failed. */
365 if (cdev->private->state == DEV_STATE_BOXED) {
366 pr_warning("%s: The device entered boxed state while "
367 "being set offline\n", dev_name(&cdev->dev));
368 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
369 pr_warning("%s: The device stopped operating while "
370 "being set offline\n", dev_name(&cdev->dev));
372 /* Give up reference from ccw_device_set_online(). */
373 put_device(&cdev->dev);
377 cdev->private->state = DEV_STATE_OFFLINE;
378 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
379 spin_unlock_irq(cdev->ccwlock);
380 /* Give up reference from ccw_device_set_online(). */
381 put_device(&cdev->dev);
386 * ccw_device_set_online() - enable a ccw device for I/O
387 * @cdev: target ccw device
389 * This function first enables @cdev and then calls the driver's set_online()
390 * function for @cdev, if given. If set_online() returns an error, @cdev is
393 * %0 on success and a negative error value on failure.
395 * enabled, ccw device lock not held
397 int ccw_device_set_online(struct ccw_device *cdev)
404 if (cdev->online || !cdev->drv)
406 /* Hold on to an extra reference while device is online. */
407 if (!get_device(&cdev->dev))
410 spin_lock_irq(cdev->ccwlock);
411 ret = ccw_device_online(cdev);
412 spin_unlock_irq(cdev->ccwlock);
414 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
416 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
417 "device 0.%x.%04x\n",
418 ret, cdev->private->dev_id.ssid,
419 cdev->private->dev_id.devno);
420 /* Give up online reference since onlining failed. */
421 put_device(&cdev->dev);
424 spin_lock_irq(cdev->ccwlock);
425 /* Check if online processing was successful */
426 if ((cdev->private->state != DEV_STATE_ONLINE) &&
427 (cdev->private->state != DEV_STATE_W4SENSE)) {
428 spin_unlock_irq(cdev->ccwlock);
429 /* Inform the user that set online failed. */
430 if (cdev->private->state == DEV_STATE_BOXED) {
431 pr_warning("%s: Setting the device online failed "
432 "because it is boxed\n",
433 dev_name(&cdev->dev));
434 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
435 pr_warning("%s: Setting the device online failed "
436 "because it is not operational\n",
437 dev_name(&cdev->dev));
439 /* Give up online reference since onlining failed. */
440 put_device(&cdev->dev);
443 spin_unlock_irq(cdev->ccwlock);
444 if (cdev->drv->set_online)
445 ret = cdev->drv->set_online(cdev);
452 spin_lock_irq(cdev->ccwlock);
453 /* Wait until a final state or DISCONNECTED is reached */
454 while (!dev_fsm_final_state(cdev) &&
455 cdev->private->state != DEV_STATE_DISCONNECTED) {
456 spin_unlock_irq(cdev->ccwlock);
457 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
458 cdev->private->state == DEV_STATE_DISCONNECTED));
459 spin_lock_irq(cdev->ccwlock);
461 ret2 = ccw_device_offline(cdev);
464 spin_unlock_irq(cdev->ccwlock);
465 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
466 cdev->private->state == DEV_STATE_DISCONNECTED));
467 /* Give up online reference since onlining failed. */
468 put_device(&cdev->dev);
472 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
473 "device 0.%x.%04x\n",
474 ret2, cdev->private->dev_id.ssid,
475 cdev->private->dev_id.devno);
476 cdev->private->state = DEV_STATE_OFFLINE;
477 spin_unlock_irq(cdev->ccwlock);
478 /* Give up online reference since onlining failed. */
479 put_device(&cdev->dev);
483 static int online_store_handle_offline(struct ccw_device *cdev)
485 if (cdev->private->state == DEV_STATE_DISCONNECTED) {
486 spin_lock_irq(cdev->ccwlock);
487 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
488 spin_unlock_irq(cdev->ccwlock);
489 } else if (cdev->online && cdev->drv && cdev->drv->set_offline)
490 return ccw_device_set_offline(cdev);
494 static int online_store_recog_and_online(struct ccw_device *cdev)
496 /* Do device recognition, if needed. */
497 if (cdev->private->state == DEV_STATE_BOXED) {
498 spin_lock_irq(cdev->ccwlock);
499 ccw_device_recognition(cdev);
500 spin_unlock_irq(cdev->ccwlock);
501 wait_event(cdev->private->wait_q,
502 cdev->private->flags.recog_done);
503 if (cdev->private->state != DEV_STATE_OFFLINE)
504 /* recognition failed */
507 if (cdev->drv && cdev->drv->set_online)
508 ccw_device_set_online(cdev);
512 static int online_store_handle_online(struct ccw_device *cdev, int force)
516 ret = online_store_recog_and_online(cdev);
519 if (force && cdev->private->state == DEV_STATE_BOXED) {
520 ret = ccw_device_stlck(cdev);
523 if (cdev->id.cu_type == 0)
524 cdev->private->state = DEV_STATE_NOT_OPER;
525 ret = online_store_recog_and_online(cdev);
532 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
533 const char *buf, size_t count)
535 struct ccw_device *cdev = to_ccwdev(dev);
539 if (!dev_fsm_final_state(cdev) &&
540 cdev->private->state != DEV_STATE_DISCONNECTED)
542 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
545 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
546 atomic_set(&cdev->private->onoff, 0);
549 if (!strncmp(buf, "force\n", count)) {
555 ret = strict_strtoul(buf, 16, &i);
561 ret = online_store_handle_offline(cdev);
564 ret = online_store_handle_online(cdev, force);
571 module_put(cdev->drv->owner);
572 atomic_set(&cdev->private->onoff, 0);
573 return (ret < 0) ? ret : count;
577 available_show (struct device *dev, struct device_attribute *attr, char *buf)
579 struct ccw_device *cdev = to_ccwdev(dev);
580 struct subchannel *sch;
582 if (ccw_device_is_orphan(cdev))
583 return sprintf(buf, "no device\n");
584 switch (cdev->private->state) {
585 case DEV_STATE_BOXED:
586 return sprintf(buf, "boxed\n");
587 case DEV_STATE_DISCONNECTED:
588 case DEV_STATE_DISCONNECTED_SENSE_ID:
589 case DEV_STATE_NOT_OPER:
590 sch = to_subchannel(dev->parent);
592 return sprintf(buf, "no path\n");
594 return sprintf(buf, "no device\n");
596 /* All other states considered fine. */
597 return sprintf(buf, "good\n");
601 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
602 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
603 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
604 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
605 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
606 static DEVICE_ATTR(online, 0644, online_show, online_store);
607 static DEVICE_ATTR(availability, 0444, available_show, NULL);
609 static struct attribute *io_subchannel_attrs[] = {
610 &dev_attr_chpids.attr,
611 &dev_attr_pimpampom.attr,
615 static struct attribute_group io_subchannel_attr_group = {
616 .attrs = io_subchannel_attrs,
619 static struct attribute * ccwdev_attrs[] = {
620 &dev_attr_devtype.attr,
621 &dev_attr_cutype.attr,
622 &dev_attr_modalias.attr,
623 &dev_attr_online.attr,
624 &dev_attr_cmb_enable.attr,
625 &dev_attr_availability.attr,
629 static struct attribute_group ccwdev_attr_group = {
630 .attrs = ccwdev_attrs,
633 static const struct attribute_group *ccwdev_attr_groups[] = {
638 /* this is a simple abstraction for device_register that sets the
639 * correct bus type and adds the bus specific files */
640 static int ccw_device_register(struct ccw_device *cdev)
642 struct device *dev = &cdev->dev;
645 dev->bus = &ccw_bus_type;
646 ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
647 cdev->private->dev_id.devno);
650 return device_add(dev);
653 static int match_dev_id(struct device *dev, void *data)
655 struct ccw_device *cdev = to_ccwdev(dev);
656 struct ccw_dev_id *dev_id = data;
658 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
661 static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
665 dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
667 return dev ? to_ccwdev(dev) : NULL;
670 static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
674 if (device_is_registered(&cdev->dev)) {
675 device_release_driver(&cdev->dev);
676 ret = device_attach(&cdev->dev);
677 WARN_ON(ret == -ENODEV);
682 ccw_device_release(struct device *dev)
684 struct ccw_device *cdev;
686 cdev = to_ccwdev(dev);
687 /* Release reference of parent subchannel. */
688 put_device(cdev->dev.parent);
689 kfree(cdev->private);
693 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
695 struct ccw_device *cdev;
697 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
699 cdev->private = kzalloc(sizeof(struct ccw_device_private),
700 GFP_KERNEL | GFP_DMA);
705 return ERR_PTR(-ENOMEM);
708 static void ccw_device_todo(struct work_struct *work);
710 static int io_subchannel_initialize_dev(struct subchannel *sch,
711 struct ccw_device *cdev)
713 cdev->private->cdev = cdev;
714 atomic_set(&cdev->private->onoff, 0);
715 cdev->dev.parent = &sch->dev;
716 cdev->dev.release = ccw_device_release;
717 INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
718 cdev->dev.groups = ccwdev_attr_groups;
719 /* Do first half of device_register. */
720 device_initialize(&cdev->dev);
721 if (!get_device(&sch->dev)) {
722 /* Release reference from device_initialize(). */
723 put_device(&cdev->dev);
726 cdev->private->flags.initialized = 1;
730 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
732 struct ccw_device *cdev;
735 cdev = io_subchannel_allocate_dev(sch);
737 ret = io_subchannel_initialize_dev(sch, cdev);
744 static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
746 static void sch_create_and_recog_new_device(struct subchannel *sch)
748 struct ccw_device *cdev;
750 /* Need to allocate a new ccw device. */
751 cdev = io_subchannel_create_ccwdev(sch);
753 /* OK, we did everything we could... */
754 css_sch_device_unregister(sch);
757 /* Start recognition for the new ccw device. */
758 io_subchannel_recog(cdev, sch);
762 * Register recognized device.
764 static void io_subchannel_register(struct ccw_device *cdev)
766 struct subchannel *sch;
770 sch = to_subchannel(cdev->dev.parent);
772 * Check if subchannel is still registered. It may have become
773 * unregistered if a machine check hit us after finishing
774 * device recognition but before the register work could be
777 if (!device_is_registered(&sch->dev))
779 css_update_ssd_info(sch);
781 * io_subchannel_register() will also be called after device
782 * recognition has been done for a boxed device (which will already
783 * be registered). We need to reprobe since we may now have sense id
786 if (device_is_registered(&cdev->dev)) {
788 ret = device_reprobe(&cdev->dev);
790 /* We can't do much here. */
791 CIO_MSG_EVENT(0, "device_reprobe() returned"
792 " %d for 0.%x.%04x\n", ret,
793 cdev->private->dev_id.ssid,
794 cdev->private->dev_id.devno);
799 * Now we know this subchannel will stay, we can throw
800 * our delayed uevent.
802 dev_set_uevent_suppress(&sch->dev, 0);
803 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
804 /* make it known to the system */
805 ret = ccw_device_register(cdev);
807 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
808 cdev->private->dev_id.ssid,
809 cdev->private->dev_id.devno, ret);
810 spin_lock_irqsave(sch->lock, flags);
811 sch_set_cdev(sch, NULL);
812 spin_unlock_irqrestore(sch->lock, flags);
813 /* Release initial device reference. */
814 put_device(&cdev->dev);
818 cdev->private->flags.recog_done = 1;
819 wake_up(&cdev->private->wait_q);
821 if (atomic_dec_and_test(&ccw_device_init_count))
822 wake_up(&ccw_device_init_wq);
825 static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
827 struct subchannel *sch;
829 /* Get subchannel reference for local processing. */
830 if (!get_device(cdev->dev.parent))
832 sch = to_subchannel(cdev->dev.parent);
833 css_sch_device_unregister(sch);
834 /* Release subchannel reference for local processing. */
835 put_device(&sch->dev);
839 * subchannel recognition done. Called from the state machine.
842 io_subchannel_recog_done(struct ccw_device *cdev)
844 if (css_init_done == 0) {
845 cdev->private->flags.recog_done = 1;
848 switch (cdev->private->state) {
849 case DEV_STATE_BOXED:
850 /* Device did not respond in time. */
851 case DEV_STATE_NOT_OPER:
852 cdev->private->flags.recog_done = 1;
853 /* Remove device found not operational. */
854 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
855 if (atomic_dec_and_test(&ccw_device_init_count))
856 wake_up(&ccw_device_init_wq);
858 case DEV_STATE_OFFLINE:
860 * We can't register the device in interrupt context so
861 * we schedule a work item.
863 ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
868 static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
870 struct ccw_device_private *priv;
872 cdev->ccwlock = sch->lock;
874 /* Init private data. */
875 priv = cdev->private;
876 priv->dev_id.devno = sch->schib.pmcw.dev;
877 priv->dev_id.ssid = sch->schid.ssid;
878 priv->schid = sch->schid;
879 priv->state = DEV_STATE_NOT_OPER;
880 INIT_LIST_HEAD(&priv->cmb_list);
881 init_waitqueue_head(&priv->wait_q);
882 init_timer(&priv->timer);
884 /* Increase counter of devices currently in recognition. */
885 atomic_inc(&ccw_device_init_count);
887 /* Start async. device sensing. */
888 spin_lock_irq(sch->lock);
889 sch_set_cdev(sch, cdev);
890 ccw_device_recognition(cdev);
891 spin_unlock_irq(sch->lock);
894 static int ccw_device_move_to_sch(struct ccw_device *cdev,
895 struct subchannel *sch)
897 struct subchannel *old_sch;
898 int rc, old_enabled = 0;
900 old_sch = to_subchannel(cdev->dev.parent);
901 /* Obtain child reference for new parent. */
902 if (!get_device(&sch->dev))
905 if (!sch_is_pseudo_sch(old_sch)) {
906 spin_lock_irq(old_sch->lock);
907 old_enabled = old_sch->schib.pmcw.ena;
910 rc = cio_disable_subchannel(old_sch);
911 spin_unlock_irq(old_sch->lock);
913 /* Release child reference for new parent. */
914 put_device(&sch->dev);
919 mutex_lock(&sch->reg_mutex);
920 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
921 mutex_unlock(&sch->reg_mutex);
923 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
924 cdev->private->dev_id.ssid,
925 cdev->private->dev_id.devno, sch->schid.ssid,
926 sch->schib.pmcw.dev, rc);
928 /* Try to reenable the old subchannel. */
929 spin_lock_irq(old_sch->lock);
930 cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch);
931 spin_unlock_irq(old_sch->lock);
933 /* Release child reference for new parent. */
934 put_device(&sch->dev);
937 /* Clean up old subchannel. */
938 if (!sch_is_pseudo_sch(old_sch)) {
939 spin_lock_irq(old_sch->lock);
940 sch_set_cdev(old_sch, NULL);
941 spin_unlock_irq(old_sch->lock);
942 css_schedule_eval(old_sch->schid);
944 /* Release child reference for old parent. */
945 put_device(&old_sch->dev);
946 /* Initialize new subchannel. */
947 spin_lock_irq(sch->lock);
948 cdev->private->schid = sch->schid;
949 cdev->ccwlock = sch->lock;
950 if (!sch_is_pseudo_sch(sch))
951 sch_set_cdev(sch, cdev);
952 spin_unlock_irq(sch->lock);
953 if (!sch_is_pseudo_sch(sch))
954 css_update_ssd_info(sch);
958 static int ccw_device_move_to_orph(struct ccw_device *cdev)
960 struct subchannel *sch = to_subchannel(cdev->dev.parent);
961 struct channel_subsystem *css = to_css(sch->dev.parent);
963 return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
966 static void io_subchannel_irq(struct subchannel *sch)
968 struct ccw_device *cdev;
970 cdev = sch_get_cdev(sch);
972 CIO_TRACE_EVENT(6, "IRQ");
973 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
975 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
978 void io_subchannel_init_config(struct subchannel *sch)
980 memset(&sch->config, 0, sizeof(sch->config));
981 sch->config.csense = 1;
984 static void io_subchannel_init_fields(struct subchannel *sch)
986 if (cio_is_console(sch->schid))
989 sch->opm = chp_get_sch_opm(sch);
990 sch->lpm = sch->schib.pmcw.pam & sch->opm;
991 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
993 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
994 " - PIM = %02X, PAM = %02X, POM = %02X\n",
995 sch->schib.pmcw.dev, sch->schid.ssid,
996 sch->schid.sch_no, sch->schib.pmcw.pim,
997 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
999 io_subchannel_init_config(sch);
1003 * Note: We always return 0 so that we bind to the device even on error.
1004 * This is needed so that our remove function is called on unregister.
1006 static int io_subchannel_probe(struct subchannel *sch)
1008 struct ccw_device *cdev;
1011 if (cio_is_console(sch->schid)) {
1012 rc = sysfs_create_group(&sch->dev.kobj,
1013 &io_subchannel_attr_group);
1015 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1016 "attributes for subchannel "
1017 "0.%x.%04x (rc=%d)\n",
1018 sch->schid.ssid, sch->schid.sch_no, rc);
1020 * The console subchannel already has an associated ccw_device.
1021 * Throw the delayed uevent for the subchannel, register
1022 * the ccw_device and exit.
1024 dev_set_uevent_suppress(&sch->dev, 0);
1025 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1026 cdev = sch_get_cdev(sch);
1027 cdev->dev.groups = ccwdev_attr_groups;
1028 device_initialize(&cdev->dev);
1029 cdev->private->flags.initialized = 1;
1030 ccw_device_register(cdev);
1032 * Check if the device is already online. If it is
1033 * the reference count needs to be corrected since we
1034 * didn't obtain a reference in ccw_device_set_online.
1036 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1037 cdev->private->state != DEV_STATE_OFFLINE &&
1038 cdev->private->state != DEV_STATE_BOXED)
1039 get_device(&cdev->dev);
1042 io_subchannel_init_fields(sch);
1043 rc = cio_commit_config(sch);
1046 rc = sysfs_create_group(&sch->dev.kobj,
1047 &io_subchannel_attr_group);
1050 /* Allocate I/O subchannel private data. */
1051 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1052 GFP_KERNEL | GFP_DMA);
1055 css_schedule_eval(sch->schid);
1059 spin_lock_irq(sch->lock);
1060 css_sched_sch_todo(sch, SCH_TODO_UNREG);
1061 spin_unlock_irq(sch->lock);
1066 io_subchannel_remove (struct subchannel *sch)
1068 struct ccw_device *cdev;
1070 cdev = sch_get_cdev(sch);
1073 io_subchannel_quiesce(sch);
1074 /* Set ccw device to not operational and drop reference. */
1075 spin_lock_irq(cdev->ccwlock);
1076 sch_set_cdev(sch, NULL);
1077 cdev->private->state = DEV_STATE_NOT_OPER;
1078 spin_unlock_irq(cdev->ccwlock);
1079 ccw_device_unregister(cdev);
1081 kfree(sch->private);
1082 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1086 static void io_subchannel_verify(struct subchannel *sch)
1088 struct ccw_device *cdev;
1090 cdev = sch_get_cdev(sch);
1092 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1095 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1097 struct ccw_device *cdev;
1099 cdev = sch_get_cdev(sch);
1102 if (cio_update_schib(sch))
1104 /* Check for I/O on path. */
1105 if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
1107 if (cdev->private->state == DEV_STATE_ONLINE) {
1108 ccw_device_kill_io(cdev);
1114 /* Trigger path verification. */
1115 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1119 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1122 static int io_subchannel_chp_event(struct subchannel *sch,
1123 struct chp_link *link, int event)
1127 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1134 io_subchannel_terminate_path(sch, mask);
1139 io_subchannel_verify(sch);
1142 if (cio_update_schib(sch))
1144 io_subchannel_terminate_path(sch, mask);
1147 if (cio_update_schib(sch))
1149 sch->lpm |= mask & sch->opm;
1150 io_subchannel_verify(sch);
1156 static void io_subchannel_quiesce(struct subchannel *sch)
1158 struct ccw_device *cdev;
1161 spin_lock_irq(sch->lock);
1162 cdev = sch_get_cdev(sch);
1163 if (cio_is_console(sch->schid))
1165 if (!sch->schib.pmcw.ena)
1167 ret = cio_disable_subchannel(sch);
1171 cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
1172 while (ret == -EBUSY) {
1173 cdev->private->state = DEV_STATE_QUIESCE;
1174 ret = ccw_device_cancel_halt_clear(cdev);
1175 if (ret == -EBUSY) {
1176 ccw_device_set_timeout(cdev, HZ/10);
1177 spin_unlock_irq(sch->lock);
1178 wait_event(cdev->private->wait_q,
1179 cdev->private->state != DEV_STATE_QUIESCE);
1180 spin_lock_irq(sch->lock);
1182 ret = cio_disable_subchannel(sch);
1185 spin_unlock_irq(sch->lock);
1188 static void io_subchannel_shutdown(struct subchannel *sch)
1190 io_subchannel_quiesce(sch);
1193 static int device_is_disconnected(struct ccw_device *cdev)
1197 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1198 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1201 static int recovery_check(struct device *dev, void *data)
1203 struct ccw_device *cdev = to_ccwdev(dev);
1206 spin_lock_irq(cdev->ccwlock);
1207 switch (cdev->private->state) {
1208 case DEV_STATE_DISCONNECTED:
1209 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1210 cdev->private->dev_id.ssid,
1211 cdev->private->dev_id.devno);
1212 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1215 case DEV_STATE_DISCONNECTED_SENSE_ID:
1219 spin_unlock_irq(cdev->ccwlock);
1224 static void recovery_work_func(struct work_struct *unused)
1228 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1230 spin_lock_irq(&recovery_lock);
1231 if (!timer_pending(&recovery_timer)) {
1232 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1234 mod_timer(&recovery_timer, jiffies +
1235 recovery_delay[recovery_phase] * HZ);
1237 spin_unlock_irq(&recovery_lock);
1239 CIO_MSG_EVENT(4, "recovery: end\n");
1242 static DECLARE_WORK(recovery_work, recovery_work_func);
1244 static void recovery_func(unsigned long data)
1247 * We can't do our recovery in softirq context and it's not
1248 * performance critical, so we schedule it.
1250 schedule_work(&recovery_work);
1253 static void ccw_device_schedule_recovery(void)
1255 unsigned long flags;
1257 CIO_MSG_EVENT(4, "recovery: schedule\n");
1258 spin_lock_irqsave(&recovery_lock, flags);
1259 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1261 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1263 spin_unlock_irqrestore(&recovery_lock, flags);
1266 static int purge_fn(struct device *dev, void *data)
1268 struct ccw_device *cdev = to_ccwdev(dev);
1269 struct ccw_dev_id *id = &cdev->private->dev_id;
1271 spin_lock_irq(cdev->ccwlock);
1272 if (is_blacklisted(id->ssid, id->devno) &&
1273 (cdev->private->state == DEV_STATE_OFFLINE)) {
1274 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
1276 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1278 spin_unlock_irq(cdev->ccwlock);
1279 /* Abort loop in case of pending signal. */
1280 if (signal_pending(current))
1287 * ccw_purge_blacklisted - purge unused, blacklisted devices
1289 * Unregister all ccw devices that are offline and on the blacklist.
1291 int ccw_purge_blacklisted(void)
1293 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1294 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1298 void ccw_device_set_disconnected(struct ccw_device *cdev)
1302 ccw_device_set_timeout(cdev, 0);
1303 cdev->private->flags.fake_irb = 0;
1304 cdev->private->state = DEV_STATE_DISCONNECTED;
1306 ccw_device_schedule_recovery();
1309 void ccw_device_set_notoper(struct ccw_device *cdev)
1311 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1313 CIO_TRACE_EVENT(2, "notoper");
1314 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1315 ccw_device_set_timeout(cdev, 0);
1316 cio_disable_subchannel(sch);
1317 cdev->private->state = DEV_STATE_NOT_OPER;
1320 enum io_sch_action {
1324 IO_SCH_UNREG_ATTACH,
1332 static enum io_sch_action sch_get_action(struct subchannel *sch)
1334 struct ccw_device *cdev;
1336 cdev = sch_get_cdev(sch);
1337 if (cio_update_schib(sch)) {
1338 /* Not operational. */
1340 return IO_SCH_UNREG;
1341 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
1342 return IO_SCH_UNREG;
1343 return IO_SCH_ORPH_UNREG;
1347 return IO_SCH_ATTACH;
1348 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1349 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
1350 return IO_SCH_UNREG_ATTACH;
1351 return IO_SCH_ORPH_ATTACH;
1353 if ((sch->schib.pmcw.pam & sch->opm) == 0) {
1354 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK)
1355 return IO_SCH_UNREG;
1358 if (device_is_disconnected(cdev))
1359 return IO_SCH_REPROBE;
1361 return IO_SCH_VERIFY;
1366 * io_subchannel_sch_event - process subchannel event
1368 * @process: non-zero if function is called in process context
1370 * An unspecified event occurred for this subchannel. Adjust data according
1371 * to the current operational state of the subchannel and device. Return
1372 * zero when the event has been handled sufficiently or -EAGAIN when this
1373 * function should be called again in process context.
1375 static int io_subchannel_sch_event(struct subchannel *sch, int process)
1377 unsigned long flags;
1378 struct ccw_device *cdev;
1379 struct ccw_dev_id dev_id;
1380 enum io_sch_action action;
1383 spin_lock_irqsave(sch->lock, flags);
1384 if (!device_is_registered(&sch->dev))
1386 if (work_pending(&sch->todo_work))
1388 cdev = sch_get_cdev(sch);
1389 if (cdev && work_pending(&cdev->private->todo_work))
1391 action = sch_get_action(sch);
1392 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1393 sch->schid.ssid, sch->schid.sch_no, process,
1395 /* Perform immediate actions while holding the lock. */
1397 case IO_SCH_REPROBE:
1398 /* Trigger device recognition. */
1399 ccw_device_trigger_reprobe(cdev);
1403 if (cdev->private->flags.resuming == 1) {
1404 if (cio_enable_subchannel(sch, (u32)(addr_t)sch)) {
1405 ccw_device_set_notoper(cdev);
1409 /* Trigger path verification. */
1410 io_subchannel_verify(sch);
1414 ccw_device_set_disconnected(cdev);
1417 case IO_SCH_ORPH_UNREG:
1418 case IO_SCH_ORPH_ATTACH:
1419 ccw_device_set_disconnected(cdev);
1421 case IO_SCH_UNREG_ATTACH:
1424 ccw_device_set_notoper(cdev);
1432 spin_unlock_irqrestore(sch->lock, flags);
1433 /* All other actions require process context. */
1436 /* Handle attached ccw device. */
1438 case IO_SCH_ORPH_UNREG:
1439 case IO_SCH_ORPH_ATTACH:
1440 /* Move ccw device to orphanage. */
1441 rc = ccw_device_move_to_orph(cdev);
1445 case IO_SCH_UNREG_ATTACH:
1446 /* Unregister ccw device. */
1447 if (!cdev->private->flags.resuming)
1448 ccw_device_unregister(cdev);
1453 /* Handle subchannel. */
1455 case IO_SCH_ORPH_UNREG:
1457 if (!cdev || !cdev->private->flags.resuming)
1458 css_sch_device_unregister(sch);
1460 case IO_SCH_ORPH_ATTACH:
1461 case IO_SCH_UNREG_ATTACH:
1463 dev_id.ssid = sch->schid.ssid;
1464 dev_id.devno = sch->schib.pmcw.dev;
1465 cdev = get_ccwdev_by_dev_id(&dev_id);
1467 sch_create_and_recog_new_device(sch);
1470 rc = ccw_device_move_to_sch(cdev, sch);
1472 /* Release reference from get_ccwdev_by_dev_id() */
1473 put_device(&cdev->dev);
1476 spin_lock_irqsave(sch->lock, flags);
1477 ccw_device_trigger_reprobe(cdev);
1478 spin_unlock_irqrestore(sch->lock, flags);
1479 /* Release reference from get_ccwdev_by_dev_id() */
1480 put_device(&cdev->dev);
1488 spin_unlock_irqrestore(sch->lock, flags);
1493 #ifdef CONFIG_CCW_CONSOLE
1494 static struct ccw_device console_cdev;
1495 static struct ccw_device_private console_private;
1496 static int console_cdev_in_use;
1498 static DEFINE_SPINLOCK(ccw_console_lock);
1500 spinlock_t * cio_get_console_lock(void)
1502 return &ccw_console_lock;
1505 static int ccw_device_console_enable(struct ccw_device *cdev,
1506 struct subchannel *sch)
1510 /* Attach subchannel private data. */
1511 sch->private = cio_get_console_priv();
1512 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1513 io_subchannel_init_fields(sch);
1514 rc = cio_commit_config(sch);
1517 sch->driver = &io_subchannel_driver;
1518 /* Initialize the ccw_device structure. */
1519 cdev->dev.parent= &sch->dev;
1520 sch_set_cdev(sch, cdev);
1521 io_subchannel_recog(cdev, sch);
1522 /* Now wait for the async. recognition to come to an end. */
1523 spin_lock_irq(cdev->ccwlock);
1524 while (!dev_fsm_final_state(cdev))
1527 if (cdev->private->state != DEV_STATE_OFFLINE)
1529 ccw_device_online(cdev);
1530 while (!dev_fsm_final_state(cdev))
1532 if (cdev->private->state != DEV_STATE_ONLINE)
1536 spin_unlock_irq(cdev->ccwlock);
1541 ccw_device_probe_console(void)
1543 struct subchannel *sch;
1546 if (xchg(&console_cdev_in_use, 1) != 0)
1547 return ERR_PTR(-EBUSY);
1548 sch = cio_probe_console();
1550 console_cdev_in_use = 0;
1551 return (void *) sch;
1553 memset(&console_cdev, 0, sizeof(struct ccw_device));
1554 memset(&console_private, 0, sizeof(struct ccw_device_private));
1555 console_cdev.private = &console_private;
1556 console_private.cdev = &console_cdev;
1557 ret = ccw_device_console_enable(&console_cdev, sch);
1559 cio_release_console();
1560 console_cdev_in_use = 0;
1561 return ERR_PTR(ret);
1563 console_cdev.online = 1;
1564 return &console_cdev;
1567 static int ccw_device_pm_restore(struct device *dev);
1569 int ccw_device_force_console(void)
1571 if (!console_cdev_in_use)
1573 return ccw_device_pm_restore(&console_cdev.dev);
1575 EXPORT_SYMBOL_GPL(ccw_device_force_console);
1579 * get ccw_device matching the busid, but only if owned by cdrv
1582 __ccwdev_check_busid(struct device *dev, void *id)
1588 return (strcmp(bus_id, dev_name(dev)) == 0);
1593 * get_ccwdev_by_busid() - obtain device from a bus id
1594 * @cdrv: driver the device is owned by
1595 * @bus_id: bus id of the device to be searched
1597 * This function searches all devices owned by @cdrv for a device with a bus
1598 * id matching @bus_id.
1600 * If a match is found, its reference count of the found device is increased
1601 * and it is returned; else %NULL is returned.
1603 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1607 struct device_driver *drv;
1609 drv = get_driver(&cdrv->driver);
1613 dev = driver_find_device(drv, NULL, (void *)bus_id,
1614 __ccwdev_check_busid);
1617 return dev ? to_ccwdev(dev) : NULL;
1620 /************************** device driver handling ************************/
1622 /* This is the implementation of the ccw_driver class. The probe, remove
1623 * and release methods are initially very similar to the device_driver
1624 * implementations, with the difference that they have ccw_device
1627 * A ccw driver also contains the information that is needed for
1631 ccw_device_probe (struct device *dev)
1633 struct ccw_device *cdev = to_ccwdev(dev);
1634 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1637 cdev->drv = cdrv; /* to let the driver call _set_online */
1639 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1650 ccw_device_remove (struct device *dev)
1652 struct ccw_device *cdev = to_ccwdev(dev);
1653 struct ccw_driver *cdrv = cdev->drv;
1660 spin_lock_irq(cdev->ccwlock);
1661 ret = ccw_device_offline(cdev);
1662 spin_unlock_irq(cdev->ccwlock);
1664 wait_event(cdev->private->wait_q,
1665 dev_fsm_final_state(cdev));
1667 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1668 "device 0.%x.%04x\n",
1669 ret, cdev->private->dev_id.ssid,
1670 cdev->private->dev_id.devno);
1671 /* Give up reference obtained in ccw_device_set_online(). */
1672 put_device(&cdev->dev);
1674 ccw_device_set_timeout(cdev, 0);
1679 static void ccw_device_shutdown(struct device *dev)
1681 struct ccw_device *cdev;
1683 cdev = to_ccwdev(dev);
1684 if (cdev->drv && cdev->drv->shutdown)
1685 cdev->drv->shutdown(cdev);
1689 static int ccw_device_pm_prepare(struct device *dev)
1691 struct ccw_device *cdev = to_ccwdev(dev);
1693 if (work_pending(&cdev->private->todo_work))
1695 /* Fail while device is being set online/offline. */
1696 if (atomic_read(&cdev->private->onoff))
1699 if (cdev->online && cdev->drv && cdev->drv->prepare)
1700 return cdev->drv->prepare(cdev);
1705 static void ccw_device_pm_complete(struct device *dev)
1707 struct ccw_device *cdev = to_ccwdev(dev);
1709 if (cdev->online && cdev->drv && cdev->drv->complete)
1710 cdev->drv->complete(cdev);
1713 static int ccw_device_pm_freeze(struct device *dev)
1715 struct ccw_device *cdev = to_ccwdev(dev);
1716 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1717 int ret, cm_enabled;
1719 /* Fail suspend while device is in transistional state. */
1720 if (!dev_fsm_final_state(cdev))
1724 if (cdev->drv && cdev->drv->freeze) {
1725 ret = cdev->drv->freeze(cdev);
1730 spin_lock_irq(sch->lock);
1731 cm_enabled = cdev->private->cmb != NULL;
1732 spin_unlock_irq(sch->lock);
1734 /* Don't have the css write on memory. */
1735 ret = ccw_set_cmf(cdev, 0);
1739 /* From here on, disallow device driver I/O. */
1740 spin_lock_irq(sch->lock);
1741 ret = cio_disable_subchannel(sch);
1742 spin_unlock_irq(sch->lock);
1747 static int ccw_device_pm_thaw(struct device *dev)
1749 struct ccw_device *cdev = to_ccwdev(dev);
1750 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1751 int ret, cm_enabled;
1756 spin_lock_irq(sch->lock);
1757 /* Allow device driver I/O again. */
1758 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1759 cm_enabled = cdev->private->cmb != NULL;
1760 spin_unlock_irq(sch->lock);
1765 ret = ccw_set_cmf(cdev, 1);
1770 if (cdev->drv && cdev->drv->thaw)
1771 ret = cdev->drv->thaw(cdev);
1776 static void __ccw_device_pm_restore(struct ccw_device *cdev)
1778 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1780 spin_lock_irq(sch->lock);
1781 if (cio_is_console(sch->schid)) {
1782 cio_enable_subchannel(sch, (u32)(addr_t)sch);
1786 * While we were sleeping, devices may have gone or become
1787 * available again. Kick re-detection.
1789 cdev->private->flags.resuming = 1;
1790 css_schedule_eval(sch->schid);
1791 spin_unlock_irq(sch->lock);
1792 css_complete_work();
1794 /* cdev may have been moved to a different subchannel. */
1795 sch = to_subchannel(cdev->dev.parent);
1796 spin_lock_irq(sch->lock);
1797 if (cdev->private->state != DEV_STATE_ONLINE &&
1798 cdev->private->state != DEV_STATE_OFFLINE)
1801 ccw_device_recognition(cdev);
1802 spin_unlock_irq(sch->lock);
1803 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
1804 cdev->private->state == DEV_STATE_DISCONNECTED);
1805 spin_lock_irq(sch->lock);
1808 cdev->private->flags.resuming = 0;
1809 spin_unlock_irq(sch->lock);
1812 static int resume_handle_boxed(struct ccw_device *cdev)
1814 cdev->private->state = DEV_STATE_BOXED;
1815 if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK)
1817 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1821 static int resume_handle_disc(struct ccw_device *cdev)
1823 cdev->private->state = DEV_STATE_DISCONNECTED;
1824 if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK)
1826 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1830 static int ccw_device_pm_restore(struct device *dev)
1832 struct ccw_device *cdev = to_ccwdev(dev);
1833 struct subchannel *sch;
1836 __ccw_device_pm_restore(cdev);
1837 sch = to_subchannel(cdev->dev.parent);
1838 spin_lock_irq(sch->lock);
1839 if (cio_is_console(sch->schid))
1842 /* check recognition results */
1843 switch (cdev->private->state) {
1844 case DEV_STATE_OFFLINE:
1845 case DEV_STATE_ONLINE:
1846 cdev->private->flags.donotify = 0;
1848 case DEV_STATE_BOXED:
1849 ret = resume_handle_boxed(cdev);
1854 ret = resume_handle_disc(cdev);
1859 /* check if the device type has changed */
1860 if (!ccw_device_test_sense_data(cdev)) {
1861 ccw_device_update_sense_data(cdev);
1862 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1869 if (ccw_device_online(cdev)) {
1870 ret = resume_handle_disc(cdev);
1875 spin_unlock_irq(sch->lock);
1876 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1877 spin_lock_irq(sch->lock);
1879 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) {
1880 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1885 /* reenable cmf, if needed */
1886 if (cdev->private->cmb) {
1887 spin_unlock_irq(sch->lock);
1888 ret = ccw_set_cmf(cdev, 1);
1889 spin_lock_irq(sch->lock);
1891 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1892 "(rc=%d)\n", cdev->private->dev_id.ssid,
1893 cdev->private->dev_id.devno, ret);
1899 spin_unlock_irq(sch->lock);
1900 if (cdev->online && cdev->drv && cdev->drv->restore)
1901 ret = cdev->drv->restore(cdev);
1905 spin_unlock_irq(sch->lock);
1909 static const struct dev_pm_ops ccw_pm_ops = {
1910 .prepare = ccw_device_pm_prepare,
1911 .complete = ccw_device_pm_complete,
1912 .freeze = ccw_device_pm_freeze,
1913 .thaw = ccw_device_pm_thaw,
1914 .restore = ccw_device_pm_restore,
1917 struct bus_type ccw_bus_type = {
1919 .match = ccw_bus_match,
1920 .uevent = ccw_uevent,
1921 .probe = ccw_device_probe,
1922 .remove = ccw_device_remove,
1923 .shutdown = ccw_device_shutdown,
1928 * ccw_driver_register() - register a ccw driver
1929 * @cdriver: driver to be registered
1931 * This function is mainly a wrapper around driver_register().
1933 * %0 on success and a negative error value on failure.
1935 int ccw_driver_register(struct ccw_driver *cdriver)
1937 struct device_driver *drv = &cdriver->driver;
1939 drv->bus = &ccw_bus_type;
1940 drv->name = cdriver->name;
1941 drv->owner = cdriver->owner;
1943 return driver_register(drv);
1947 * ccw_driver_unregister() - deregister a ccw driver
1948 * @cdriver: driver to be deregistered
1950 * This function is mainly a wrapper around driver_unregister().
1952 void ccw_driver_unregister(struct ccw_driver *cdriver)
1954 driver_unregister(&cdriver->driver);
1957 /* Helper func for qdio. */
1958 struct subchannel_id
1959 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1961 struct subchannel *sch;
1963 sch = to_subchannel(cdev->dev.parent);
1967 static void ccw_device_todo(struct work_struct *work)
1969 struct ccw_device_private *priv;
1970 struct ccw_device *cdev;
1971 struct subchannel *sch;
1972 enum cdev_todo todo;
1974 priv = container_of(work, struct ccw_device_private, todo_work);
1976 sch = to_subchannel(cdev->dev.parent);
1977 /* Find out todo. */
1978 spin_lock_irq(cdev->ccwlock);
1980 priv->todo = CDEV_TODO_NOTHING;
1981 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1982 priv->dev_id.ssid, priv->dev_id.devno, todo);
1983 spin_unlock_irq(cdev->ccwlock);
1986 case CDEV_TODO_ENABLE_CMF:
1989 case CDEV_TODO_REBIND:
1990 ccw_device_do_unbind_bind(cdev);
1992 case CDEV_TODO_REGISTER:
1993 io_subchannel_register(cdev);
1995 case CDEV_TODO_UNREG_EVAL:
1996 if (!sch_is_pseudo_sch(sch))
1997 css_schedule_eval(sch->schid);
1999 case CDEV_TODO_UNREG:
2000 if (sch_is_pseudo_sch(sch))
2001 ccw_device_unregister(cdev);
2003 ccw_device_call_sch_unregister(cdev);
2008 /* Release workqueue ref. */
2009 put_device(&cdev->dev);
2013 * ccw_device_sched_todo - schedule ccw device operation
2017 * Schedule the operation identified by @todo to be performed on the slow path
2018 * workqueue. Do nothing if another operation with higher priority is already
2019 * scheduled. Needs to be called with ccwdev lock held.
2021 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
2023 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2024 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
2026 if (cdev->private->todo >= todo)
2028 cdev->private->todo = todo;
2029 /* Get workqueue ref. */
2030 if (!get_device(&cdev->dev))
2032 if (!queue_work(cio_work_q, &cdev->private->todo_work)) {
2033 /* Already queued, release workqueue ref. */
2034 put_device(&cdev->dev);
2038 MODULE_LICENSE("GPL");
2039 EXPORT_SYMBOL(ccw_device_set_online);
2040 EXPORT_SYMBOL(ccw_device_set_offline);
2041 EXPORT_SYMBOL(ccw_driver_register);
2042 EXPORT_SYMBOL(ccw_driver_unregister);
2043 EXPORT_SYMBOL(get_ccwdev_by_busid);
2044 EXPORT_SYMBOL(ccw_bus_type);
2045 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);