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;
767 int ret, adjust_init_count = 1;
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);
796 adjust_init_count = 0;
800 * Now we know this subchannel will stay, we can throw
801 * our delayed uevent.
803 dev_set_uevent_suppress(&sch->dev, 0);
804 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
805 /* make it known to the system */
806 ret = ccw_device_register(cdev);
808 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
809 cdev->private->dev_id.ssid,
810 cdev->private->dev_id.devno, ret);
811 spin_lock_irqsave(sch->lock, flags);
812 sch_set_cdev(sch, NULL);
813 spin_unlock_irqrestore(sch->lock, flags);
814 /* Release initial device reference. */
815 put_device(&cdev->dev);
819 cdev->private->flags.recog_done = 1;
820 wake_up(&cdev->private->wait_q);
822 if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count))
823 wake_up(&ccw_device_init_wq);
826 static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
828 struct subchannel *sch;
830 /* Get subchannel reference for local processing. */
831 if (!get_device(cdev->dev.parent))
833 sch = to_subchannel(cdev->dev.parent);
834 css_sch_device_unregister(sch);
835 /* Release subchannel reference for local processing. */
836 put_device(&sch->dev);
840 * subchannel recognition done. Called from the state machine.
843 io_subchannel_recog_done(struct ccw_device *cdev)
845 if (css_init_done == 0) {
846 cdev->private->flags.recog_done = 1;
849 switch (cdev->private->state) {
850 case DEV_STATE_BOXED:
851 /* Device did not respond in time. */
852 case DEV_STATE_NOT_OPER:
853 cdev->private->flags.recog_done = 1;
854 /* Remove device found not operational. */
855 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
856 if (atomic_dec_and_test(&ccw_device_init_count))
857 wake_up(&ccw_device_init_wq);
859 case DEV_STATE_OFFLINE:
861 * We can't register the device in interrupt context so
862 * we schedule a work item.
864 ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
869 static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
871 struct ccw_device_private *priv;
873 cdev->ccwlock = sch->lock;
875 /* Init private data. */
876 priv = cdev->private;
877 priv->dev_id.devno = sch->schib.pmcw.dev;
878 priv->dev_id.ssid = sch->schid.ssid;
879 priv->schid = sch->schid;
880 priv->state = DEV_STATE_NOT_OPER;
881 INIT_LIST_HEAD(&priv->cmb_list);
882 init_waitqueue_head(&priv->wait_q);
883 init_timer(&priv->timer);
885 /* Increase counter of devices currently in recognition. */
886 atomic_inc(&ccw_device_init_count);
888 /* Start async. device sensing. */
889 spin_lock_irq(sch->lock);
890 sch_set_cdev(sch, cdev);
891 ccw_device_recognition(cdev);
892 spin_unlock_irq(sch->lock);
895 static int ccw_device_move_to_sch(struct ccw_device *cdev,
896 struct subchannel *sch)
898 struct subchannel *old_sch;
899 int rc, old_enabled = 0;
901 old_sch = to_subchannel(cdev->dev.parent);
902 /* Obtain child reference for new parent. */
903 if (!get_device(&sch->dev))
906 if (!sch_is_pseudo_sch(old_sch)) {
907 spin_lock_irq(old_sch->lock);
908 old_enabled = old_sch->schib.pmcw.ena;
911 rc = cio_disable_subchannel(old_sch);
912 spin_unlock_irq(old_sch->lock);
914 /* Release child reference for new parent. */
915 put_device(&sch->dev);
920 mutex_lock(&sch->reg_mutex);
921 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
922 mutex_unlock(&sch->reg_mutex);
924 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
925 cdev->private->dev_id.ssid,
926 cdev->private->dev_id.devno, sch->schid.ssid,
927 sch->schib.pmcw.dev, rc);
929 /* Try to reenable the old subchannel. */
930 spin_lock_irq(old_sch->lock);
931 cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch);
932 spin_unlock_irq(old_sch->lock);
934 /* Release child reference for new parent. */
935 put_device(&sch->dev);
938 /* Clean up old subchannel. */
939 if (!sch_is_pseudo_sch(old_sch)) {
940 spin_lock_irq(old_sch->lock);
941 sch_set_cdev(old_sch, NULL);
942 spin_unlock_irq(old_sch->lock);
943 css_schedule_eval(old_sch->schid);
945 /* Release child reference for old parent. */
946 put_device(&old_sch->dev);
947 /* Initialize new subchannel. */
948 spin_lock_irq(sch->lock);
949 cdev->private->schid = sch->schid;
950 cdev->ccwlock = sch->lock;
951 if (!sch_is_pseudo_sch(sch))
952 sch_set_cdev(sch, cdev);
953 spin_unlock_irq(sch->lock);
954 if (!sch_is_pseudo_sch(sch))
955 css_update_ssd_info(sch);
959 static int ccw_device_move_to_orph(struct ccw_device *cdev)
961 struct subchannel *sch = to_subchannel(cdev->dev.parent);
962 struct channel_subsystem *css = to_css(sch->dev.parent);
964 return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
967 static void io_subchannel_irq(struct subchannel *sch)
969 struct ccw_device *cdev;
971 cdev = sch_get_cdev(sch);
973 CIO_TRACE_EVENT(6, "IRQ");
974 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
976 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
979 void io_subchannel_init_config(struct subchannel *sch)
981 memset(&sch->config, 0, sizeof(sch->config));
982 sch->config.csense = 1;
985 static void io_subchannel_init_fields(struct subchannel *sch)
987 if (cio_is_console(sch->schid))
990 sch->opm = chp_get_sch_opm(sch);
991 sch->lpm = sch->schib.pmcw.pam & sch->opm;
992 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
994 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
995 " - PIM = %02X, PAM = %02X, POM = %02X\n",
996 sch->schib.pmcw.dev, sch->schid.ssid,
997 sch->schid.sch_no, sch->schib.pmcw.pim,
998 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
1000 io_subchannel_init_config(sch);
1004 * Note: We always return 0 so that we bind to the device even on error.
1005 * This is needed so that our remove function is called on unregister.
1007 static int io_subchannel_probe(struct subchannel *sch)
1009 struct ccw_device *cdev;
1012 if (cio_is_console(sch->schid)) {
1013 rc = sysfs_create_group(&sch->dev.kobj,
1014 &io_subchannel_attr_group);
1016 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1017 "attributes for subchannel "
1018 "0.%x.%04x (rc=%d)\n",
1019 sch->schid.ssid, sch->schid.sch_no, rc);
1021 * The console subchannel already has an associated ccw_device.
1022 * Throw the delayed uevent for the subchannel, register
1023 * the ccw_device and exit.
1025 dev_set_uevent_suppress(&sch->dev, 0);
1026 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1027 cdev = sch_get_cdev(sch);
1028 cdev->dev.groups = ccwdev_attr_groups;
1029 device_initialize(&cdev->dev);
1030 cdev->private->flags.initialized = 1;
1031 ccw_device_register(cdev);
1033 * Check if the device is already online. If it is
1034 * the reference count needs to be corrected since we
1035 * didn't obtain a reference in ccw_device_set_online.
1037 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1038 cdev->private->state != DEV_STATE_OFFLINE &&
1039 cdev->private->state != DEV_STATE_BOXED)
1040 get_device(&cdev->dev);
1043 io_subchannel_init_fields(sch);
1044 rc = cio_commit_config(sch);
1047 rc = sysfs_create_group(&sch->dev.kobj,
1048 &io_subchannel_attr_group);
1051 /* Allocate I/O subchannel private data. */
1052 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1053 GFP_KERNEL | GFP_DMA);
1056 css_schedule_eval(sch->schid);
1060 spin_lock_irq(sch->lock);
1061 css_sched_sch_todo(sch, SCH_TODO_UNREG);
1062 spin_unlock_irq(sch->lock);
1067 io_subchannel_remove (struct subchannel *sch)
1069 struct ccw_device *cdev;
1071 cdev = sch_get_cdev(sch);
1074 io_subchannel_quiesce(sch);
1075 /* Set ccw device to not operational and drop reference. */
1076 spin_lock_irq(cdev->ccwlock);
1077 sch_set_cdev(sch, NULL);
1078 cdev->private->state = DEV_STATE_NOT_OPER;
1079 spin_unlock_irq(cdev->ccwlock);
1080 ccw_device_unregister(cdev);
1082 kfree(sch->private);
1083 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1087 static void io_subchannel_verify(struct subchannel *sch)
1089 struct ccw_device *cdev;
1091 cdev = sch_get_cdev(sch);
1093 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1096 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1098 struct ccw_device *cdev;
1100 cdev = sch_get_cdev(sch);
1103 if (cio_update_schib(sch))
1105 /* Check for I/O on path. */
1106 if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
1108 if (cdev->private->state == DEV_STATE_ONLINE) {
1109 ccw_device_kill_io(cdev);
1115 /* Trigger path verification. */
1116 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1120 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1123 static int io_subchannel_chp_event(struct subchannel *sch,
1124 struct chp_link *link, int event)
1128 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1135 io_subchannel_terminate_path(sch, mask);
1140 io_subchannel_verify(sch);
1143 if (cio_update_schib(sch))
1145 io_subchannel_terminate_path(sch, mask);
1148 if (cio_update_schib(sch))
1150 sch->lpm |= mask & sch->opm;
1151 io_subchannel_verify(sch);
1157 static void io_subchannel_quiesce(struct subchannel *sch)
1159 struct ccw_device *cdev;
1162 spin_lock_irq(sch->lock);
1163 cdev = sch_get_cdev(sch);
1164 if (cio_is_console(sch->schid))
1166 if (!sch->schib.pmcw.ena)
1168 ret = cio_disable_subchannel(sch);
1172 cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
1173 while (ret == -EBUSY) {
1174 cdev->private->state = DEV_STATE_QUIESCE;
1175 ret = ccw_device_cancel_halt_clear(cdev);
1176 if (ret == -EBUSY) {
1177 ccw_device_set_timeout(cdev, HZ/10);
1178 spin_unlock_irq(sch->lock);
1179 wait_event(cdev->private->wait_q,
1180 cdev->private->state != DEV_STATE_QUIESCE);
1181 spin_lock_irq(sch->lock);
1183 ret = cio_disable_subchannel(sch);
1186 spin_unlock_irq(sch->lock);
1189 static void io_subchannel_shutdown(struct subchannel *sch)
1191 io_subchannel_quiesce(sch);
1194 static int device_is_disconnected(struct ccw_device *cdev)
1198 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1199 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1202 static int recovery_check(struct device *dev, void *data)
1204 struct ccw_device *cdev = to_ccwdev(dev);
1207 spin_lock_irq(cdev->ccwlock);
1208 switch (cdev->private->state) {
1209 case DEV_STATE_DISCONNECTED:
1210 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1211 cdev->private->dev_id.ssid,
1212 cdev->private->dev_id.devno);
1213 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1216 case DEV_STATE_DISCONNECTED_SENSE_ID:
1220 spin_unlock_irq(cdev->ccwlock);
1225 static void recovery_work_func(struct work_struct *unused)
1229 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1231 spin_lock_irq(&recovery_lock);
1232 if (!timer_pending(&recovery_timer)) {
1233 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1235 mod_timer(&recovery_timer, jiffies +
1236 recovery_delay[recovery_phase] * HZ);
1238 spin_unlock_irq(&recovery_lock);
1240 CIO_MSG_EVENT(4, "recovery: end\n");
1243 static DECLARE_WORK(recovery_work, recovery_work_func);
1245 static void recovery_func(unsigned long data)
1248 * We can't do our recovery in softirq context and it's not
1249 * performance critical, so we schedule it.
1251 schedule_work(&recovery_work);
1254 static void ccw_device_schedule_recovery(void)
1256 unsigned long flags;
1258 CIO_MSG_EVENT(4, "recovery: schedule\n");
1259 spin_lock_irqsave(&recovery_lock, flags);
1260 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1262 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1264 spin_unlock_irqrestore(&recovery_lock, flags);
1267 static int purge_fn(struct device *dev, void *data)
1269 struct ccw_device *cdev = to_ccwdev(dev);
1270 struct ccw_dev_id *id = &cdev->private->dev_id;
1272 spin_lock_irq(cdev->ccwlock);
1273 if (is_blacklisted(id->ssid, id->devno) &&
1274 (cdev->private->state == DEV_STATE_OFFLINE)) {
1275 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
1277 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1279 spin_unlock_irq(cdev->ccwlock);
1280 /* Abort loop in case of pending signal. */
1281 if (signal_pending(current))
1288 * ccw_purge_blacklisted - purge unused, blacklisted devices
1290 * Unregister all ccw devices that are offline and on the blacklist.
1292 int ccw_purge_blacklisted(void)
1294 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1295 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1299 void ccw_device_set_disconnected(struct ccw_device *cdev)
1303 ccw_device_set_timeout(cdev, 0);
1304 cdev->private->flags.fake_irb = 0;
1305 cdev->private->state = DEV_STATE_DISCONNECTED;
1307 ccw_device_schedule_recovery();
1310 void ccw_device_set_notoper(struct ccw_device *cdev)
1312 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1314 CIO_TRACE_EVENT(2, "notoper");
1315 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1316 ccw_device_set_timeout(cdev, 0);
1317 cio_disable_subchannel(sch);
1318 cdev->private->state = DEV_STATE_NOT_OPER;
1321 enum io_sch_action {
1325 IO_SCH_UNREG_ATTACH,
1333 static enum io_sch_action sch_get_action(struct subchannel *sch)
1335 struct ccw_device *cdev;
1337 cdev = sch_get_cdev(sch);
1338 if (cio_update_schib(sch)) {
1339 /* Not operational. */
1341 return IO_SCH_UNREG;
1342 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
1343 return IO_SCH_UNREG;
1344 return IO_SCH_ORPH_UNREG;
1348 return IO_SCH_ATTACH;
1349 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1350 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
1351 return IO_SCH_UNREG_ATTACH;
1352 return IO_SCH_ORPH_ATTACH;
1354 if ((sch->schib.pmcw.pam & sch->opm) == 0) {
1355 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK)
1356 return IO_SCH_UNREG;
1359 if (device_is_disconnected(cdev))
1360 return IO_SCH_REPROBE;
1362 return IO_SCH_VERIFY;
1367 * io_subchannel_sch_event - process subchannel event
1369 * @process: non-zero if function is called in process context
1371 * An unspecified event occurred for this subchannel. Adjust data according
1372 * to the current operational state of the subchannel and device. Return
1373 * zero when the event has been handled sufficiently or -EAGAIN when this
1374 * function should be called again in process context.
1376 static int io_subchannel_sch_event(struct subchannel *sch, int process)
1378 unsigned long flags;
1379 struct ccw_device *cdev;
1380 struct ccw_dev_id dev_id;
1381 enum io_sch_action action;
1384 spin_lock_irqsave(sch->lock, flags);
1385 if (!device_is_registered(&sch->dev))
1387 if (work_pending(&sch->todo_work))
1389 cdev = sch_get_cdev(sch);
1390 if (cdev && work_pending(&cdev->private->todo_work))
1392 action = sch_get_action(sch);
1393 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1394 sch->schid.ssid, sch->schid.sch_no, process,
1396 /* Perform immediate actions while holding the lock. */
1398 case IO_SCH_REPROBE:
1399 /* Trigger device recognition. */
1400 ccw_device_trigger_reprobe(cdev);
1404 if (cdev->private->flags.resuming == 1) {
1405 if (cio_enable_subchannel(sch, (u32)(addr_t)sch)) {
1406 ccw_device_set_notoper(cdev);
1410 /* Trigger path verification. */
1411 io_subchannel_verify(sch);
1415 ccw_device_set_disconnected(cdev);
1418 case IO_SCH_ORPH_UNREG:
1419 case IO_SCH_ORPH_ATTACH:
1420 ccw_device_set_disconnected(cdev);
1422 case IO_SCH_UNREG_ATTACH:
1425 ccw_device_set_notoper(cdev);
1433 spin_unlock_irqrestore(sch->lock, flags);
1434 /* All other actions require process context. */
1437 /* Handle attached ccw device. */
1439 case IO_SCH_ORPH_UNREG:
1440 case IO_SCH_ORPH_ATTACH:
1441 /* Move ccw device to orphanage. */
1442 rc = ccw_device_move_to_orph(cdev);
1446 case IO_SCH_UNREG_ATTACH:
1447 /* Unregister ccw device. */
1448 if (!cdev->private->flags.resuming)
1449 ccw_device_unregister(cdev);
1454 /* Handle subchannel. */
1456 case IO_SCH_ORPH_UNREG:
1458 if (!cdev || !cdev->private->flags.resuming)
1459 css_sch_device_unregister(sch);
1461 case IO_SCH_ORPH_ATTACH:
1462 case IO_SCH_UNREG_ATTACH:
1464 dev_id.ssid = sch->schid.ssid;
1465 dev_id.devno = sch->schib.pmcw.dev;
1466 cdev = get_ccwdev_by_dev_id(&dev_id);
1468 sch_create_and_recog_new_device(sch);
1471 rc = ccw_device_move_to_sch(cdev, sch);
1473 /* Release reference from get_ccwdev_by_dev_id() */
1474 put_device(&cdev->dev);
1477 spin_lock_irqsave(sch->lock, flags);
1478 ccw_device_trigger_reprobe(cdev);
1479 spin_unlock_irqrestore(sch->lock, flags);
1480 /* Release reference from get_ccwdev_by_dev_id() */
1481 put_device(&cdev->dev);
1489 spin_unlock_irqrestore(sch->lock, flags);
1494 #ifdef CONFIG_CCW_CONSOLE
1495 static struct ccw_device console_cdev;
1496 static struct ccw_device_private console_private;
1497 static int console_cdev_in_use;
1499 static DEFINE_SPINLOCK(ccw_console_lock);
1501 spinlock_t * cio_get_console_lock(void)
1503 return &ccw_console_lock;
1506 static int ccw_device_console_enable(struct ccw_device *cdev,
1507 struct subchannel *sch)
1511 /* Attach subchannel private data. */
1512 sch->private = cio_get_console_priv();
1513 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1514 io_subchannel_init_fields(sch);
1515 rc = cio_commit_config(sch);
1518 sch->driver = &io_subchannel_driver;
1519 /* Initialize the ccw_device structure. */
1520 cdev->dev.parent= &sch->dev;
1521 sch_set_cdev(sch, cdev);
1522 io_subchannel_recog(cdev, sch);
1523 /* Now wait for the async. recognition to come to an end. */
1524 spin_lock_irq(cdev->ccwlock);
1525 while (!dev_fsm_final_state(cdev))
1528 if (cdev->private->state != DEV_STATE_OFFLINE)
1530 ccw_device_online(cdev);
1531 while (!dev_fsm_final_state(cdev))
1533 if (cdev->private->state != DEV_STATE_ONLINE)
1537 spin_unlock_irq(cdev->ccwlock);
1542 ccw_device_probe_console(void)
1544 struct subchannel *sch;
1547 if (xchg(&console_cdev_in_use, 1) != 0)
1548 return ERR_PTR(-EBUSY);
1549 sch = cio_probe_console();
1551 console_cdev_in_use = 0;
1552 return (void *) sch;
1554 memset(&console_cdev, 0, sizeof(struct ccw_device));
1555 memset(&console_private, 0, sizeof(struct ccw_device_private));
1556 console_cdev.private = &console_private;
1557 console_private.cdev = &console_cdev;
1558 ret = ccw_device_console_enable(&console_cdev, sch);
1560 cio_release_console();
1561 console_cdev_in_use = 0;
1562 return ERR_PTR(ret);
1564 console_cdev.online = 1;
1565 return &console_cdev;
1568 static int ccw_device_pm_restore(struct device *dev);
1570 int ccw_device_force_console(void)
1572 if (!console_cdev_in_use)
1574 return ccw_device_pm_restore(&console_cdev.dev);
1576 EXPORT_SYMBOL_GPL(ccw_device_force_console);
1580 * get ccw_device matching the busid, but only if owned by cdrv
1583 __ccwdev_check_busid(struct device *dev, void *id)
1589 return (strcmp(bus_id, dev_name(dev)) == 0);
1594 * get_ccwdev_by_busid() - obtain device from a bus id
1595 * @cdrv: driver the device is owned by
1596 * @bus_id: bus id of the device to be searched
1598 * This function searches all devices owned by @cdrv for a device with a bus
1599 * id matching @bus_id.
1601 * If a match is found, its reference count of the found device is increased
1602 * and it is returned; else %NULL is returned.
1604 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1608 struct device_driver *drv;
1610 drv = get_driver(&cdrv->driver);
1614 dev = driver_find_device(drv, NULL, (void *)bus_id,
1615 __ccwdev_check_busid);
1618 return dev ? to_ccwdev(dev) : NULL;
1621 /************************** device driver handling ************************/
1623 /* This is the implementation of the ccw_driver class. The probe, remove
1624 * and release methods are initially very similar to the device_driver
1625 * implementations, with the difference that they have ccw_device
1628 * A ccw driver also contains the information that is needed for
1632 ccw_device_probe (struct device *dev)
1634 struct ccw_device *cdev = to_ccwdev(dev);
1635 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1638 cdev->drv = cdrv; /* to let the driver call _set_online */
1640 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1651 ccw_device_remove (struct device *dev)
1653 struct ccw_device *cdev = to_ccwdev(dev);
1654 struct ccw_driver *cdrv = cdev->drv;
1661 spin_lock_irq(cdev->ccwlock);
1662 ret = ccw_device_offline(cdev);
1663 spin_unlock_irq(cdev->ccwlock);
1665 wait_event(cdev->private->wait_q,
1666 dev_fsm_final_state(cdev));
1668 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1669 "device 0.%x.%04x\n",
1670 ret, cdev->private->dev_id.ssid,
1671 cdev->private->dev_id.devno);
1672 /* Give up reference obtained in ccw_device_set_online(). */
1673 put_device(&cdev->dev);
1675 ccw_device_set_timeout(cdev, 0);
1680 static void ccw_device_shutdown(struct device *dev)
1682 struct ccw_device *cdev;
1684 cdev = to_ccwdev(dev);
1685 if (cdev->drv && cdev->drv->shutdown)
1686 cdev->drv->shutdown(cdev);
1690 static int ccw_device_pm_prepare(struct device *dev)
1692 struct ccw_device *cdev = to_ccwdev(dev);
1694 if (work_pending(&cdev->private->todo_work))
1696 /* Fail while device is being set online/offline. */
1697 if (atomic_read(&cdev->private->onoff))
1700 if (cdev->online && cdev->drv && cdev->drv->prepare)
1701 return cdev->drv->prepare(cdev);
1706 static void ccw_device_pm_complete(struct device *dev)
1708 struct ccw_device *cdev = to_ccwdev(dev);
1710 if (cdev->online && cdev->drv && cdev->drv->complete)
1711 cdev->drv->complete(cdev);
1714 static int ccw_device_pm_freeze(struct device *dev)
1716 struct ccw_device *cdev = to_ccwdev(dev);
1717 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1718 int ret, cm_enabled;
1720 /* Fail suspend while device is in transistional state. */
1721 if (!dev_fsm_final_state(cdev))
1725 if (cdev->drv && cdev->drv->freeze) {
1726 ret = cdev->drv->freeze(cdev);
1731 spin_lock_irq(sch->lock);
1732 cm_enabled = cdev->private->cmb != NULL;
1733 spin_unlock_irq(sch->lock);
1735 /* Don't have the css write on memory. */
1736 ret = ccw_set_cmf(cdev, 0);
1740 /* From here on, disallow device driver I/O. */
1741 spin_lock_irq(sch->lock);
1742 ret = cio_disable_subchannel(sch);
1743 spin_unlock_irq(sch->lock);
1748 static int ccw_device_pm_thaw(struct device *dev)
1750 struct ccw_device *cdev = to_ccwdev(dev);
1751 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1752 int ret, cm_enabled;
1757 spin_lock_irq(sch->lock);
1758 /* Allow device driver I/O again. */
1759 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1760 cm_enabled = cdev->private->cmb != NULL;
1761 spin_unlock_irq(sch->lock);
1766 ret = ccw_set_cmf(cdev, 1);
1771 if (cdev->drv && cdev->drv->thaw)
1772 ret = cdev->drv->thaw(cdev);
1777 static void __ccw_device_pm_restore(struct ccw_device *cdev)
1779 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1781 spin_lock_irq(sch->lock);
1782 if (cio_is_console(sch->schid)) {
1783 cio_enable_subchannel(sch, (u32)(addr_t)sch);
1787 * While we were sleeping, devices may have gone or become
1788 * available again. Kick re-detection.
1790 cdev->private->flags.resuming = 1;
1791 css_schedule_eval(sch->schid);
1792 spin_unlock_irq(sch->lock);
1793 css_complete_work();
1795 /* cdev may have been moved to a different subchannel. */
1796 sch = to_subchannel(cdev->dev.parent);
1797 spin_lock_irq(sch->lock);
1798 if (cdev->private->state != DEV_STATE_ONLINE &&
1799 cdev->private->state != DEV_STATE_OFFLINE)
1802 ccw_device_recognition(cdev);
1803 spin_unlock_irq(sch->lock);
1804 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
1805 cdev->private->state == DEV_STATE_DISCONNECTED);
1806 spin_lock_irq(sch->lock);
1809 cdev->private->flags.resuming = 0;
1810 spin_unlock_irq(sch->lock);
1813 static int resume_handle_boxed(struct ccw_device *cdev)
1815 cdev->private->state = DEV_STATE_BOXED;
1816 if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK)
1818 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1822 static int resume_handle_disc(struct ccw_device *cdev)
1824 cdev->private->state = DEV_STATE_DISCONNECTED;
1825 if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK)
1827 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1831 static int ccw_device_pm_restore(struct device *dev)
1833 struct ccw_device *cdev = to_ccwdev(dev);
1834 struct subchannel *sch;
1837 __ccw_device_pm_restore(cdev);
1838 sch = to_subchannel(cdev->dev.parent);
1839 spin_lock_irq(sch->lock);
1840 if (cio_is_console(sch->schid))
1843 /* check recognition results */
1844 switch (cdev->private->state) {
1845 case DEV_STATE_OFFLINE:
1846 case DEV_STATE_ONLINE:
1847 cdev->private->flags.donotify = 0;
1849 case DEV_STATE_BOXED:
1850 ret = resume_handle_boxed(cdev);
1855 ret = resume_handle_disc(cdev);
1860 /* check if the device type has changed */
1861 if (!ccw_device_test_sense_data(cdev)) {
1862 ccw_device_update_sense_data(cdev);
1863 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1870 if (ccw_device_online(cdev)) {
1871 ret = resume_handle_disc(cdev);
1876 spin_unlock_irq(sch->lock);
1877 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1878 spin_lock_irq(sch->lock);
1880 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) {
1881 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1886 /* reenable cmf, if needed */
1887 if (cdev->private->cmb) {
1888 spin_unlock_irq(sch->lock);
1889 ret = ccw_set_cmf(cdev, 1);
1890 spin_lock_irq(sch->lock);
1892 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1893 "(rc=%d)\n", cdev->private->dev_id.ssid,
1894 cdev->private->dev_id.devno, ret);
1900 spin_unlock_irq(sch->lock);
1901 if (cdev->online && cdev->drv && cdev->drv->restore)
1902 ret = cdev->drv->restore(cdev);
1906 spin_unlock_irq(sch->lock);
1910 static const struct dev_pm_ops ccw_pm_ops = {
1911 .prepare = ccw_device_pm_prepare,
1912 .complete = ccw_device_pm_complete,
1913 .freeze = ccw_device_pm_freeze,
1914 .thaw = ccw_device_pm_thaw,
1915 .restore = ccw_device_pm_restore,
1918 struct bus_type ccw_bus_type = {
1920 .match = ccw_bus_match,
1921 .uevent = ccw_uevent,
1922 .probe = ccw_device_probe,
1923 .remove = ccw_device_remove,
1924 .shutdown = ccw_device_shutdown,
1929 * ccw_driver_register() - register a ccw driver
1930 * @cdriver: driver to be registered
1932 * This function is mainly a wrapper around driver_register().
1934 * %0 on success and a negative error value on failure.
1936 int ccw_driver_register(struct ccw_driver *cdriver)
1938 struct device_driver *drv = &cdriver->driver;
1940 drv->bus = &ccw_bus_type;
1941 drv->name = cdriver->name;
1942 drv->owner = cdriver->owner;
1944 return driver_register(drv);
1948 * ccw_driver_unregister() - deregister a ccw driver
1949 * @cdriver: driver to be deregistered
1951 * This function is mainly a wrapper around driver_unregister().
1953 void ccw_driver_unregister(struct ccw_driver *cdriver)
1955 driver_unregister(&cdriver->driver);
1958 /* Helper func for qdio. */
1959 struct subchannel_id
1960 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1962 struct subchannel *sch;
1964 sch = to_subchannel(cdev->dev.parent);
1968 static void ccw_device_todo(struct work_struct *work)
1970 struct ccw_device_private *priv;
1971 struct ccw_device *cdev;
1972 struct subchannel *sch;
1973 enum cdev_todo todo;
1975 priv = container_of(work, struct ccw_device_private, todo_work);
1977 sch = to_subchannel(cdev->dev.parent);
1978 /* Find out todo. */
1979 spin_lock_irq(cdev->ccwlock);
1981 priv->todo = CDEV_TODO_NOTHING;
1982 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1983 priv->dev_id.ssid, priv->dev_id.devno, todo);
1984 spin_unlock_irq(cdev->ccwlock);
1987 case CDEV_TODO_ENABLE_CMF:
1990 case CDEV_TODO_REBIND:
1991 ccw_device_do_unbind_bind(cdev);
1993 case CDEV_TODO_REGISTER:
1994 io_subchannel_register(cdev);
1996 case CDEV_TODO_UNREG_EVAL:
1997 if (!sch_is_pseudo_sch(sch))
1998 css_schedule_eval(sch->schid);
2000 case CDEV_TODO_UNREG:
2001 if (sch_is_pseudo_sch(sch))
2002 ccw_device_unregister(cdev);
2004 ccw_device_call_sch_unregister(cdev);
2009 /* Release workqueue ref. */
2010 put_device(&cdev->dev);
2014 * ccw_device_sched_todo - schedule ccw device operation
2018 * Schedule the operation identified by @todo to be performed on the slow path
2019 * workqueue. Do nothing if another operation with higher priority is already
2020 * scheduled. Needs to be called with ccwdev lock held.
2022 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
2024 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2025 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
2027 if (cdev->private->todo >= todo)
2029 cdev->private->todo = todo;
2030 /* Get workqueue ref. */
2031 if (!get_device(&cdev->dev))
2033 if (!queue_work(cio_work_q, &cdev->private->todo_work)) {
2034 /* Already queued, release workqueue ref. */
2035 put_device(&cdev->dev);
2039 MODULE_LICENSE("GPL");
2040 EXPORT_SYMBOL(ccw_device_set_online);
2041 EXPORT_SYMBOL(ccw_device_set_offline);
2042 EXPORT_SYMBOL(ccw_driver_register);
2043 EXPORT_SYMBOL(ccw_driver_unregister);
2044 EXPORT_SYMBOL(get_ccwdev_by_busid);
2045 EXPORT_SYMBOL(ccw_bus_type);
2046 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);