2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
5 * Copyright IBM Corp. 2002,2008
6 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/spinlock.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include <linux/list.h>
21 #include <linux/device.h>
22 #include <linux/workqueue.h>
23 #include <linux/timer.h>
25 #include <asm/ccwdev.h>
27 #include <asm/param.h> /* HZ */
33 #include "cio_debug.h"
38 #include "blacklist.h"
40 static struct timer_list recovery_timer;
41 static DEFINE_SPINLOCK(recovery_lock);
42 static int recovery_phase;
43 static const unsigned long recovery_delay[] = { 3, 30, 300 };
45 /******************* bus type handling ***********************/
47 /* The Linux driver model distinguishes between a bus type and
48 * the bus itself. Of course we only have one channel
49 * subsystem driver and one channel system per machine, but
50 * we still use the abstraction. T.R. says it's a good idea. */
52 ccw_bus_match (struct device * dev, struct device_driver * drv)
54 struct ccw_device *cdev = to_ccwdev(dev);
55 struct ccw_driver *cdrv = to_ccwdrv(drv);
56 const struct ccw_device_id *ids = cdrv->ids, *found;
61 found = ccw_device_id_match(ids, &cdev->id);
65 cdev->id.driver_info = found->driver_info;
70 /* Store modalias string delimited by prefix/suffix string into buffer with
71 * specified size. Return length of resulting string (excluding trailing '\0')
72 * even if string doesn't fit buffer (snprintf semantics). */
73 static int snprint_alias(char *buf, size_t size,
74 struct ccw_device_id *id, const char *suffix)
78 len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
84 if (id->dev_type != 0)
85 len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
86 id->dev_model, suffix);
88 len += snprintf(buf, size, "dtdm%s", suffix);
93 /* Set up environment variables for ccw device uevent. Return 0 on success,
94 * non-zero otherwise. */
95 static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
97 struct ccw_device *cdev = to_ccwdev(dev);
98 struct ccw_device_id *id = &(cdev->id);
100 char modalias_buf[30];
103 ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
108 ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
112 /* The next two can be zero, that's ok for us */
114 ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
119 ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
124 snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
125 ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
129 struct bus_type ccw_bus_type;
131 static void io_subchannel_irq(struct subchannel *);
132 static int io_subchannel_probe(struct subchannel *);
133 static int io_subchannel_remove(struct subchannel *);
134 static void io_subchannel_shutdown(struct subchannel *);
135 static int io_subchannel_sch_event(struct subchannel *, int);
136 static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
138 static void recovery_func(unsigned long data);
139 struct workqueue_struct *ccw_device_work;
140 wait_queue_head_t ccw_device_init_wq;
141 atomic_t ccw_device_init_count;
143 static struct css_device_id io_subchannel_ids[] = {
144 { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
145 { /* end of list */ },
147 MODULE_DEVICE_TABLE(css, io_subchannel_ids);
149 static int io_subchannel_prepare(struct subchannel *sch)
151 struct ccw_device *cdev;
153 * Don't allow suspend while a ccw device registration
154 * is still outstanding.
156 cdev = sch_get_cdev(sch);
157 if (cdev && !device_is_registered(&cdev->dev))
162 static void io_subchannel_settle(void)
164 wait_event(ccw_device_init_wq,
165 atomic_read(&ccw_device_init_count) == 0);
166 flush_workqueue(ccw_device_work);
169 static struct css_driver io_subchannel_driver = {
170 .owner = THIS_MODULE,
171 .subchannel_type = io_subchannel_ids,
172 .name = "io_subchannel",
173 .irq = io_subchannel_irq,
174 .sch_event = io_subchannel_sch_event,
175 .chp_event = io_subchannel_chp_event,
176 .probe = io_subchannel_probe,
177 .remove = io_subchannel_remove,
178 .shutdown = io_subchannel_shutdown,
179 .prepare = io_subchannel_prepare,
180 .settle = io_subchannel_settle,
183 int __init io_subchannel_init(void)
187 init_waitqueue_head(&ccw_device_init_wq);
188 atomic_set(&ccw_device_init_count, 0);
189 setup_timer(&recovery_timer, recovery_func, 0);
191 ccw_device_work = create_singlethread_workqueue("cio");
192 if (!ccw_device_work)
194 slow_path_wq = create_singlethread_workqueue("kslowcrw");
199 if ((ret = bus_register (&ccw_bus_type)))
202 ret = css_driver_register(&io_subchannel_driver);
209 destroy_workqueue(ccw_device_work);
211 destroy_workqueue(slow_path_wq);
216 /************************ device handling **************************/
219 * A ccw_device has some interfaces in sysfs in addition to the
221 * The following entries are designed to export the information which
222 * resided in 2.4 in /proc/subchannels. Subchannel and device number
223 * are obvious, so they don't have an entry :)
224 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
227 chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
229 struct subchannel *sch = to_subchannel(dev);
230 struct chsc_ssd_info *ssd = &sch->ssd_info;
235 for (chp = 0; chp < 8; chp++) {
237 if (ssd->path_mask & mask)
238 ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
240 ret += sprintf(buf + ret, "00 ");
242 ret += sprintf (buf+ret, "\n");
243 return min((ssize_t)PAGE_SIZE, ret);
247 pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
249 struct subchannel *sch = to_subchannel(dev);
250 struct pmcw *pmcw = &sch->schib.pmcw;
252 return sprintf (buf, "%02x %02x %02x\n",
253 pmcw->pim, pmcw->pam, pmcw->pom);
257 devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
259 struct ccw_device *cdev = to_ccwdev(dev);
260 struct ccw_device_id *id = &(cdev->id);
262 if (id->dev_type != 0)
263 return sprintf(buf, "%04x/%02x\n",
264 id->dev_type, id->dev_model);
266 return sprintf(buf, "n/a\n");
270 cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
272 struct ccw_device *cdev = to_ccwdev(dev);
273 struct ccw_device_id *id = &(cdev->id);
275 return sprintf(buf, "%04x/%02x\n",
276 id->cu_type, id->cu_model);
280 modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
282 struct ccw_device *cdev = to_ccwdev(dev);
283 struct ccw_device_id *id = &(cdev->id);
286 len = snprint_alias(buf, PAGE_SIZE, id, "\n");
288 return len > PAGE_SIZE ? PAGE_SIZE : len;
292 online_show (struct device *dev, struct device_attribute *attr, char *buf)
294 struct ccw_device *cdev = to_ccwdev(dev);
296 return sprintf(buf, cdev->online ? "1\n" : "0\n");
299 int ccw_device_is_orphan(struct ccw_device *cdev)
301 return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
304 static void ccw_device_unregister(struct ccw_device *cdev)
306 if (device_is_registered(&cdev->dev)) {
307 device_del(&cdev->dev);
308 /* Release reference from device_initialize(). */
309 put_device(&cdev->dev);
314 * ccw_device_set_offline() - disable a ccw device for I/O
315 * @cdev: target ccw device
317 * This function calls the driver's set_offline() function for @cdev, if
318 * given, and then disables @cdev.
320 * %0 on success and a negative error value on failure.
322 * enabled, ccw device lock not held
324 int ccw_device_set_offline(struct ccw_device *cdev)
330 if (!cdev->online || !cdev->drv)
333 if (cdev->drv->set_offline) {
334 ret = cdev->drv->set_offline(cdev);
339 spin_lock_irq(cdev->ccwlock);
340 /* Wait until a final state or DISCONNECTED is reached */
341 while (!dev_fsm_final_state(cdev) &&
342 cdev->private->state != DEV_STATE_DISCONNECTED) {
343 spin_unlock_irq(cdev->ccwlock);
344 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
345 cdev->private->state == DEV_STATE_DISCONNECTED));
346 spin_lock_irq(cdev->ccwlock);
348 ret = ccw_device_offline(cdev);
351 spin_unlock_irq(cdev->ccwlock);
352 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
353 cdev->private->state == DEV_STATE_DISCONNECTED));
354 /* Inform the user if set offline failed. */
355 if (cdev->private->state == DEV_STATE_BOXED) {
356 pr_warning("%s: The device entered boxed state while "
357 "being set offline\n", dev_name(&cdev->dev));
358 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
359 pr_warning("%s: The device stopped operating while "
360 "being set offline\n", dev_name(&cdev->dev));
362 /* Give up reference from ccw_device_set_online(). */
363 put_device(&cdev->dev);
367 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
368 ret, cdev->private->dev_id.ssid,
369 cdev->private->dev_id.devno);
370 cdev->private->state = DEV_STATE_OFFLINE;
371 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
372 spin_unlock_irq(cdev->ccwlock);
373 /* Give up reference from ccw_device_set_online(). */
374 put_device(&cdev->dev);
379 * ccw_device_set_online() - enable a ccw device for I/O
380 * @cdev: target ccw device
382 * This function first enables @cdev and then calls the driver's set_online()
383 * function for @cdev, if given. If set_online() returns an error, @cdev is
386 * %0 on success and a negative error value on failure.
388 * enabled, ccw device lock not held
390 int ccw_device_set_online(struct ccw_device *cdev)
397 if (cdev->online || !cdev->drv)
399 /* Hold on to an extra reference while device is online. */
400 if (!get_device(&cdev->dev))
403 spin_lock_irq(cdev->ccwlock);
404 ret = ccw_device_online(cdev);
405 spin_unlock_irq(cdev->ccwlock);
407 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
409 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
410 "device 0.%x.%04x\n",
411 ret, cdev->private->dev_id.ssid,
412 cdev->private->dev_id.devno);
413 /* Give up online reference since onlining failed. */
414 put_device(&cdev->dev);
417 spin_lock_irq(cdev->ccwlock);
418 /* Check if online processing was successful */
419 if ((cdev->private->state != DEV_STATE_ONLINE) &&
420 (cdev->private->state != DEV_STATE_W4SENSE)) {
421 spin_unlock_irq(cdev->ccwlock);
422 /* Inform the user that set online failed. */
423 if (cdev->private->state == DEV_STATE_BOXED) {
424 pr_warning("%s: Setting the device online failed "
425 "because it is boxed\n",
426 dev_name(&cdev->dev));
427 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
428 pr_warning("%s: Setting the device online failed "
429 "because it is not operational\n",
430 dev_name(&cdev->dev));
432 /* Give up online reference since onlining failed. */
433 put_device(&cdev->dev);
436 spin_unlock_irq(cdev->ccwlock);
437 if (cdev->drv->set_online)
438 ret = cdev->drv->set_online(cdev);
445 spin_lock_irq(cdev->ccwlock);
446 /* Wait until a final state or DISCONNECTED is reached */
447 while (!dev_fsm_final_state(cdev) &&
448 cdev->private->state != DEV_STATE_DISCONNECTED) {
449 spin_unlock_irq(cdev->ccwlock);
450 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
451 cdev->private->state == DEV_STATE_DISCONNECTED));
452 spin_lock_irq(cdev->ccwlock);
454 ret2 = ccw_device_offline(cdev);
457 spin_unlock_irq(cdev->ccwlock);
458 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
459 cdev->private->state == DEV_STATE_DISCONNECTED));
460 /* Give up online reference since onlining failed. */
461 put_device(&cdev->dev);
465 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
466 "device 0.%x.%04x\n",
467 ret2, cdev->private->dev_id.ssid,
468 cdev->private->dev_id.devno);
469 cdev->private->state = DEV_STATE_OFFLINE;
470 spin_unlock_irq(cdev->ccwlock);
471 /* Give up online reference since onlining failed. */
472 put_device(&cdev->dev);
476 static int online_store_handle_offline(struct ccw_device *cdev)
478 if (cdev->private->state == DEV_STATE_DISCONNECTED) {
479 spin_lock_irq(cdev->ccwlock);
480 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
481 spin_unlock_irq(cdev->ccwlock);
482 } else if (cdev->online && cdev->drv && cdev->drv->set_offline)
483 return ccw_device_set_offline(cdev);
487 static int online_store_recog_and_online(struct ccw_device *cdev)
489 /* Do device recognition, if needed. */
490 if (cdev->private->state == DEV_STATE_BOXED) {
491 spin_lock_irq(cdev->ccwlock);
492 ccw_device_recognition(cdev);
493 spin_unlock_irq(cdev->ccwlock);
494 wait_event(cdev->private->wait_q,
495 cdev->private->flags.recog_done);
496 if (cdev->private->state != DEV_STATE_OFFLINE)
497 /* recognition failed */
500 if (cdev->drv && cdev->drv->set_online)
501 ccw_device_set_online(cdev);
505 static int online_store_handle_online(struct ccw_device *cdev, int force)
509 ret = online_store_recog_and_online(cdev);
512 if (force && cdev->private->state == DEV_STATE_BOXED) {
513 ret = ccw_device_stlck(cdev);
516 if (cdev->id.cu_type == 0)
517 cdev->private->state = DEV_STATE_NOT_OPER;
518 ret = online_store_recog_and_online(cdev);
525 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
526 const char *buf, size_t count)
528 struct ccw_device *cdev = to_ccwdev(dev);
532 if (!dev_fsm_final_state(cdev) &&
533 cdev->private->state != DEV_STATE_DISCONNECTED)
535 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
538 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
539 atomic_set(&cdev->private->onoff, 0);
542 if (!strncmp(buf, "force\n", count)) {
548 ret = strict_strtoul(buf, 16, &i);
554 ret = online_store_handle_offline(cdev);
557 ret = online_store_handle_online(cdev, force);
564 module_put(cdev->drv->owner);
565 atomic_set(&cdev->private->onoff, 0);
566 return (ret < 0) ? ret : count;
570 available_show (struct device *dev, struct device_attribute *attr, char *buf)
572 struct ccw_device *cdev = to_ccwdev(dev);
573 struct subchannel *sch;
575 if (ccw_device_is_orphan(cdev))
576 return sprintf(buf, "no device\n");
577 switch (cdev->private->state) {
578 case DEV_STATE_BOXED:
579 return sprintf(buf, "boxed\n");
580 case DEV_STATE_DISCONNECTED:
581 case DEV_STATE_DISCONNECTED_SENSE_ID:
582 case DEV_STATE_NOT_OPER:
583 sch = to_subchannel(dev->parent);
585 return sprintf(buf, "no path\n");
587 return sprintf(buf, "no device\n");
589 /* All other states considered fine. */
590 return sprintf(buf, "good\n");
594 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
595 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
596 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
597 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
598 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
599 static DEVICE_ATTR(online, 0644, online_show, online_store);
600 static DEVICE_ATTR(availability, 0444, available_show, NULL);
602 static struct attribute *io_subchannel_attrs[] = {
603 &dev_attr_chpids.attr,
604 &dev_attr_pimpampom.attr,
608 static struct attribute_group io_subchannel_attr_group = {
609 .attrs = io_subchannel_attrs,
612 static struct attribute * ccwdev_attrs[] = {
613 &dev_attr_devtype.attr,
614 &dev_attr_cutype.attr,
615 &dev_attr_modalias.attr,
616 &dev_attr_online.attr,
617 &dev_attr_cmb_enable.attr,
618 &dev_attr_availability.attr,
622 static struct attribute_group ccwdev_attr_group = {
623 .attrs = ccwdev_attrs,
626 static const struct attribute_group *ccwdev_attr_groups[] = {
631 /* this is a simple abstraction for device_register that sets the
632 * correct bus type and adds the bus specific files */
633 static int ccw_device_register(struct ccw_device *cdev)
635 struct device *dev = &cdev->dev;
638 dev->bus = &ccw_bus_type;
639 ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
640 cdev->private->dev_id.devno);
643 return device_add(dev);
646 static int match_dev_id(struct device *dev, void *data)
648 struct ccw_device *cdev = to_ccwdev(dev);
649 struct ccw_dev_id *dev_id = data;
651 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
654 static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
658 dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
660 return dev ? to_ccwdev(dev) : NULL;
663 static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
667 if (device_is_registered(&cdev->dev)) {
668 device_release_driver(&cdev->dev);
669 ret = device_attach(&cdev->dev);
670 WARN_ON(ret == -ENODEV);
675 ccw_device_release(struct device *dev)
677 struct ccw_device *cdev;
679 cdev = to_ccwdev(dev);
680 /* Release reference of parent subchannel. */
681 put_device(cdev->dev.parent);
682 kfree(cdev->private);
686 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
688 struct ccw_device *cdev;
690 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
692 cdev->private = kzalloc(sizeof(struct ccw_device_private),
693 GFP_KERNEL | GFP_DMA);
698 return ERR_PTR(-ENOMEM);
701 static void ccw_device_todo(struct work_struct *work);
703 static int io_subchannel_initialize_dev(struct subchannel *sch,
704 struct ccw_device *cdev)
706 cdev->private->cdev = cdev;
707 atomic_set(&cdev->private->onoff, 0);
708 cdev->dev.parent = &sch->dev;
709 cdev->dev.release = ccw_device_release;
710 INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
711 cdev->dev.groups = ccwdev_attr_groups;
712 /* Do first half of device_register. */
713 device_initialize(&cdev->dev);
714 if (!get_device(&sch->dev)) {
715 /* Release reference from device_initialize(). */
716 put_device(&cdev->dev);
722 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
724 struct ccw_device *cdev;
727 cdev = io_subchannel_allocate_dev(sch);
729 ret = io_subchannel_initialize_dev(sch, cdev);
736 static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
738 static void sch_create_and_recog_new_device(struct subchannel *sch)
740 struct ccw_device *cdev;
742 /* Need to allocate a new ccw device. */
743 cdev = io_subchannel_create_ccwdev(sch);
745 /* OK, we did everything we could... */
746 css_sch_device_unregister(sch);
749 /* Start recognition for the new ccw device. */
750 io_subchannel_recog(cdev, sch);
754 * Register recognized device.
756 static void io_subchannel_register(struct ccw_device *cdev)
758 struct subchannel *sch;
762 sch = to_subchannel(cdev->dev.parent);
764 * Check if subchannel is still registered. It may have become
765 * unregistered if a machine check hit us after finishing
766 * device recognition but before the register work could be
769 if (!device_is_registered(&sch->dev))
771 css_update_ssd_info(sch);
773 * io_subchannel_register() will also be called after device
774 * recognition has been done for a boxed device (which will already
775 * be registered). We need to reprobe since we may now have sense id
778 if (device_is_registered(&cdev->dev)) {
780 ret = device_reprobe(&cdev->dev);
782 /* We can't do much here. */
783 CIO_MSG_EVENT(0, "device_reprobe() returned"
784 " %d for 0.%x.%04x\n", ret,
785 cdev->private->dev_id.ssid,
786 cdev->private->dev_id.devno);
791 * Now we know this subchannel will stay, we can throw
792 * our delayed uevent.
794 dev_set_uevent_suppress(&sch->dev, 0);
795 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
796 /* make it known to the system */
797 ret = ccw_device_register(cdev);
799 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
800 cdev->private->dev_id.ssid,
801 cdev->private->dev_id.devno, ret);
802 spin_lock_irqsave(sch->lock, flags);
803 sch_set_cdev(sch, NULL);
804 spin_unlock_irqrestore(sch->lock, flags);
805 /* Release initial device reference. */
806 put_device(&cdev->dev);
810 cdev->private->flags.recog_done = 1;
811 wake_up(&cdev->private->wait_q);
813 if (atomic_dec_and_test(&ccw_device_init_count))
814 wake_up(&ccw_device_init_wq);
817 static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
819 struct subchannel *sch;
821 /* Get subchannel reference for local processing. */
822 if (!get_device(cdev->dev.parent))
824 sch = to_subchannel(cdev->dev.parent);
825 css_sch_device_unregister(sch);
826 /* Release subchannel reference for local processing. */
827 put_device(&sch->dev);
831 * subchannel recognition done. Called from the state machine.
834 io_subchannel_recog_done(struct ccw_device *cdev)
836 if (css_init_done == 0) {
837 cdev->private->flags.recog_done = 1;
840 switch (cdev->private->state) {
841 case DEV_STATE_BOXED:
842 /* Device did not respond in time. */
843 case DEV_STATE_NOT_OPER:
844 cdev->private->flags.recog_done = 1;
845 /* Remove device found not operational. */
846 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
847 if (atomic_dec_and_test(&ccw_device_init_count))
848 wake_up(&ccw_device_init_wq);
850 case DEV_STATE_OFFLINE:
852 * We can't register the device in interrupt context so
853 * we schedule a work item.
855 ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
860 static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
862 struct ccw_device_private *priv;
864 cdev->ccwlock = sch->lock;
866 /* Init private data. */
867 priv = cdev->private;
868 priv->dev_id.devno = sch->schib.pmcw.dev;
869 priv->dev_id.ssid = sch->schid.ssid;
870 priv->schid = sch->schid;
871 priv->state = DEV_STATE_NOT_OPER;
872 INIT_LIST_HEAD(&priv->cmb_list);
873 init_waitqueue_head(&priv->wait_q);
874 init_timer(&priv->timer);
876 /* Increase counter of devices currently in recognition. */
877 atomic_inc(&ccw_device_init_count);
879 /* Start async. device sensing. */
880 spin_lock_irq(sch->lock);
881 sch_set_cdev(sch, cdev);
882 ccw_device_recognition(cdev);
883 spin_unlock_irq(sch->lock);
886 static int ccw_device_move_to_sch(struct ccw_device *cdev,
887 struct subchannel *sch)
889 struct subchannel *old_sch;
892 old_sch = to_subchannel(cdev->dev.parent);
893 /* Obtain child reference for new parent. */
894 if (!get_device(&sch->dev))
896 mutex_lock(&sch->reg_mutex);
897 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
898 mutex_unlock(&sch->reg_mutex);
900 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
901 cdev->private->dev_id.ssid,
902 cdev->private->dev_id.devno, sch->schid.ssid,
903 sch->schib.pmcw.dev, rc);
904 /* Release child reference for new parent. */
905 put_device(&sch->dev);
908 /* Clean up old subchannel. */
909 if (!sch_is_pseudo_sch(old_sch)) {
910 spin_lock_irq(old_sch->lock);
911 sch_set_cdev(old_sch, NULL);
912 cio_disable_subchannel(old_sch);
913 spin_unlock_irq(old_sch->lock);
914 css_schedule_eval(old_sch->schid);
916 /* Release child reference for old parent. */
917 put_device(&old_sch->dev);
918 /* Initialize new subchannel. */
919 spin_lock_irq(sch->lock);
920 cdev->private->schid = sch->schid;
921 cdev->ccwlock = sch->lock;
922 if (!sch_is_pseudo_sch(sch))
923 sch_set_cdev(sch, cdev);
924 spin_unlock_irq(sch->lock);
925 if (!sch_is_pseudo_sch(sch))
926 css_update_ssd_info(sch);
930 static int ccw_device_move_to_orph(struct ccw_device *cdev)
932 struct subchannel *sch = to_subchannel(cdev->dev.parent);
933 struct channel_subsystem *css = to_css(sch->dev.parent);
935 return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
938 static void io_subchannel_irq(struct subchannel *sch)
940 struct ccw_device *cdev;
942 cdev = sch_get_cdev(sch);
944 CIO_TRACE_EVENT(6, "IRQ");
945 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
947 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
950 void io_subchannel_init_config(struct subchannel *sch)
952 memset(&sch->config, 0, sizeof(sch->config));
953 sch->config.csense = 1;
956 static void io_subchannel_init_fields(struct subchannel *sch)
958 if (cio_is_console(sch->schid))
961 sch->opm = chp_get_sch_opm(sch);
962 sch->lpm = sch->schib.pmcw.pam & sch->opm;
963 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
965 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
966 " - PIM = %02X, PAM = %02X, POM = %02X\n",
967 sch->schib.pmcw.dev, sch->schid.ssid,
968 sch->schid.sch_no, sch->schib.pmcw.pim,
969 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
971 io_subchannel_init_config(sch);
975 * Note: We always return 0 so that we bind to the device even on error.
976 * This is needed so that our remove function is called on unregister.
978 static int io_subchannel_probe(struct subchannel *sch)
980 struct ccw_device *cdev;
983 if (cio_is_console(sch->schid)) {
984 rc = sysfs_create_group(&sch->dev.kobj,
985 &io_subchannel_attr_group);
987 CIO_MSG_EVENT(0, "Failed to create io subchannel "
988 "attributes for subchannel "
989 "0.%x.%04x (rc=%d)\n",
990 sch->schid.ssid, sch->schid.sch_no, rc);
992 * The console subchannel already has an associated ccw_device.
993 * Throw the delayed uevent for the subchannel, register
994 * the ccw_device and exit.
996 dev_set_uevent_suppress(&sch->dev, 0);
997 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
998 cdev = sch_get_cdev(sch);
999 cdev->dev.groups = ccwdev_attr_groups;
1000 device_initialize(&cdev->dev);
1001 ccw_device_register(cdev);
1003 * Check if the device is already online. If it is
1004 * the reference count needs to be corrected since we
1005 * didn't obtain a reference in ccw_device_set_online.
1007 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1008 cdev->private->state != DEV_STATE_OFFLINE &&
1009 cdev->private->state != DEV_STATE_BOXED)
1010 get_device(&cdev->dev);
1013 io_subchannel_init_fields(sch);
1014 rc = cio_commit_config(sch);
1017 rc = sysfs_create_group(&sch->dev.kobj,
1018 &io_subchannel_attr_group);
1021 /* Allocate I/O subchannel private data. */
1022 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1023 GFP_KERNEL | GFP_DMA);
1026 css_schedule_eval(sch->schid);
1030 spin_lock_irq(sch->lock);
1031 css_sched_sch_todo(sch, SCH_TODO_UNREG);
1032 spin_unlock_irq(sch->lock);
1037 io_subchannel_remove (struct subchannel *sch)
1039 struct ccw_device *cdev;
1040 unsigned long flags;
1042 cdev = sch_get_cdev(sch);
1045 /* Set ccw device to not operational and drop reference. */
1046 spin_lock_irqsave(cdev->ccwlock, flags);
1047 sch_set_cdev(sch, NULL);
1048 cdev->private->state = DEV_STATE_NOT_OPER;
1049 spin_unlock_irqrestore(cdev->ccwlock, flags);
1050 ccw_device_unregister(cdev);
1052 kfree(sch->private);
1053 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1057 static void io_subchannel_verify(struct subchannel *sch)
1059 struct ccw_device *cdev;
1061 cdev = sch_get_cdev(sch);
1063 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1066 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1068 struct ccw_device *cdev;
1070 cdev = sch_get_cdev(sch);
1073 if (cio_update_schib(sch))
1075 /* Check for I/O on path. */
1076 if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
1078 if (cdev->private->state == DEV_STATE_ONLINE) {
1079 ccw_device_kill_io(cdev);
1085 /* Trigger path verification. */
1086 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1090 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1093 static int io_subchannel_chp_event(struct subchannel *sch,
1094 struct chp_link *link, int event)
1098 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1105 io_subchannel_terminate_path(sch, mask);
1110 io_subchannel_verify(sch);
1113 if (cio_update_schib(sch))
1115 io_subchannel_terminate_path(sch, mask);
1118 if (cio_update_schib(sch))
1120 sch->lpm |= mask & sch->opm;
1121 io_subchannel_verify(sch);
1128 io_subchannel_shutdown(struct subchannel *sch)
1130 struct ccw_device *cdev;
1133 cdev = sch_get_cdev(sch);
1135 if (cio_is_console(sch->schid))
1137 if (!sch->schib.pmcw.ena)
1138 /* Nothing to do. */
1140 ret = cio_disable_subchannel(sch);
1142 /* Subchannel is disabled, we're done. */
1144 cdev->private->state = DEV_STATE_QUIESCE;
1146 cdev->handler(cdev, cdev->private->intparm,
1148 ret = ccw_device_cancel_halt_clear(cdev);
1149 if (ret == -EBUSY) {
1150 ccw_device_set_timeout(cdev, HZ/10);
1151 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1153 cio_disable_subchannel(sch);
1156 static int device_is_disconnected(struct ccw_device *cdev)
1160 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1161 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1164 static int recovery_check(struct device *dev, void *data)
1166 struct ccw_device *cdev = to_ccwdev(dev);
1169 spin_lock_irq(cdev->ccwlock);
1170 switch (cdev->private->state) {
1171 case DEV_STATE_DISCONNECTED:
1172 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1173 cdev->private->dev_id.ssid,
1174 cdev->private->dev_id.devno);
1175 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1178 case DEV_STATE_DISCONNECTED_SENSE_ID:
1182 spin_unlock_irq(cdev->ccwlock);
1187 static void recovery_work_func(struct work_struct *unused)
1191 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1193 spin_lock_irq(&recovery_lock);
1194 if (!timer_pending(&recovery_timer)) {
1195 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1197 mod_timer(&recovery_timer, jiffies +
1198 recovery_delay[recovery_phase] * HZ);
1200 spin_unlock_irq(&recovery_lock);
1202 CIO_MSG_EVENT(4, "recovery: end\n");
1205 static DECLARE_WORK(recovery_work, recovery_work_func);
1207 static void recovery_func(unsigned long data)
1210 * We can't do our recovery in softirq context and it's not
1211 * performance critical, so we schedule it.
1213 schedule_work(&recovery_work);
1216 static void ccw_device_schedule_recovery(void)
1218 unsigned long flags;
1220 CIO_MSG_EVENT(4, "recovery: schedule\n");
1221 spin_lock_irqsave(&recovery_lock, flags);
1222 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1224 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1226 spin_unlock_irqrestore(&recovery_lock, flags);
1229 static int purge_fn(struct device *dev, void *data)
1231 struct ccw_device *cdev = to_ccwdev(dev);
1232 struct ccw_dev_id *id = &cdev->private->dev_id;
1234 spin_lock_irq(cdev->ccwlock);
1235 if (is_blacklisted(id->ssid, id->devno) &&
1236 (cdev->private->state == DEV_STATE_OFFLINE)) {
1237 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
1239 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1241 spin_unlock_irq(cdev->ccwlock);
1242 /* Abort loop in case of pending signal. */
1243 if (signal_pending(current))
1250 * ccw_purge_blacklisted - purge unused, blacklisted devices
1252 * Unregister all ccw devices that are offline and on the blacklist.
1254 int ccw_purge_blacklisted(void)
1256 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1257 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1261 void ccw_device_set_disconnected(struct ccw_device *cdev)
1265 ccw_device_set_timeout(cdev, 0);
1266 cdev->private->flags.fake_irb = 0;
1267 cdev->private->state = DEV_STATE_DISCONNECTED;
1269 ccw_device_schedule_recovery();
1272 void ccw_device_set_notoper(struct ccw_device *cdev)
1274 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1276 CIO_TRACE_EVENT(2, "notoper");
1277 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1278 ccw_device_set_timeout(cdev, 0);
1279 cio_disable_subchannel(sch);
1280 cdev->private->state = DEV_STATE_NOT_OPER;
1283 enum io_sch_action {
1287 IO_SCH_UNREG_ATTACH,
1295 static enum io_sch_action sch_get_action(struct subchannel *sch)
1297 struct ccw_device *cdev;
1299 cdev = sch_get_cdev(sch);
1300 if (cio_update_schib(sch)) {
1301 /* Not operational. */
1303 return IO_SCH_UNREG;
1304 if (!ccw_device_notify(cdev, CIO_GONE))
1305 return IO_SCH_UNREG;
1306 return IO_SCH_ORPH_UNREG;
1310 return IO_SCH_ATTACH;
1311 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1312 if (!ccw_device_notify(cdev, CIO_GONE))
1313 return IO_SCH_UNREG_ATTACH;
1314 return IO_SCH_ORPH_ATTACH;
1316 if ((sch->schib.pmcw.pam & sch->opm) == 0) {
1317 if (!ccw_device_notify(cdev, CIO_NO_PATH))
1318 return IO_SCH_UNREG;
1321 if (device_is_disconnected(cdev))
1322 return IO_SCH_REPROBE;
1324 return IO_SCH_VERIFY;
1329 * io_subchannel_sch_event - process subchannel event
1331 * @process: non-zero if function is called in process context
1333 * An unspecified event occurred for this subchannel. Adjust data according
1334 * to the current operational state of the subchannel and device. Return
1335 * zero when the event has been handled sufficiently or -EAGAIN when this
1336 * function should be called again in process context.
1338 static int io_subchannel_sch_event(struct subchannel *sch, int process)
1340 unsigned long flags;
1341 struct ccw_device *cdev;
1342 struct ccw_dev_id dev_id;
1343 enum io_sch_action action;
1346 spin_lock_irqsave(sch->lock, flags);
1347 if (!device_is_registered(&sch->dev))
1349 if (work_pending(&sch->todo_work))
1351 cdev = sch_get_cdev(sch);
1352 if (cdev && work_pending(&cdev->private->todo_work))
1354 action = sch_get_action(sch);
1355 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1356 sch->schid.ssid, sch->schid.sch_no, process,
1358 /* Perform immediate actions while holding the lock. */
1360 case IO_SCH_REPROBE:
1361 /* Trigger device recognition. */
1362 ccw_device_trigger_reprobe(cdev);
1366 /* Trigger path verification. */
1367 io_subchannel_verify(sch);
1371 ccw_device_set_disconnected(cdev);
1374 case IO_SCH_ORPH_UNREG:
1375 case IO_SCH_ORPH_ATTACH:
1376 ccw_device_set_disconnected(cdev);
1378 case IO_SCH_UNREG_ATTACH:
1381 ccw_device_set_notoper(cdev);
1389 spin_unlock_irqrestore(sch->lock, flags);
1390 /* All other actions require process context. */
1393 /* Handle attached ccw device. */
1395 case IO_SCH_ORPH_UNREG:
1396 case IO_SCH_ORPH_ATTACH:
1397 /* Move ccw device to orphanage. */
1398 rc = ccw_device_move_to_orph(cdev);
1402 case IO_SCH_UNREG_ATTACH:
1403 /* Unregister ccw device. */
1404 ccw_device_unregister(cdev);
1409 /* Handle subchannel. */
1411 case IO_SCH_ORPH_UNREG:
1413 css_sch_device_unregister(sch);
1415 case IO_SCH_ORPH_ATTACH:
1416 case IO_SCH_UNREG_ATTACH:
1418 dev_id.ssid = sch->schid.ssid;
1419 dev_id.devno = sch->schib.pmcw.dev;
1420 cdev = get_ccwdev_by_dev_id(&dev_id);
1422 sch_create_and_recog_new_device(sch);
1425 rc = ccw_device_move_to_sch(cdev, sch);
1427 /* Release reference from get_ccwdev_by_dev_id() */
1428 put_device(&cdev->dev);
1431 spin_lock_irqsave(sch->lock, flags);
1432 ccw_device_trigger_reprobe(cdev);
1433 spin_unlock_irqrestore(sch->lock, flags);
1434 /* Release reference from get_ccwdev_by_dev_id() */
1435 put_device(&cdev->dev);
1443 spin_unlock_irqrestore(sch->lock, flags);
1448 #ifdef CONFIG_CCW_CONSOLE
1449 static struct ccw_device console_cdev;
1450 static struct ccw_device_private console_private;
1451 static int console_cdev_in_use;
1453 static DEFINE_SPINLOCK(ccw_console_lock);
1455 spinlock_t * cio_get_console_lock(void)
1457 return &ccw_console_lock;
1460 static int ccw_device_console_enable(struct ccw_device *cdev,
1461 struct subchannel *sch)
1465 /* Attach subchannel private data. */
1466 sch->private = cio_get_console_priv();
1467 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1468 io_subchannel_init_fields(sch);
1469 rc = cio_commit_config(sch);
1472 sch->driver = &io_subchannel_driver;
1473 /* Initialize the ccw_device structure. */
1474 cdev->dev.parent= &sch->dev;
1475 io_subchannel_recog(cdev, sch);
1476 /* Now wait for the async. recognition to come to an end. */
1477 spin_lock_irq(cdev->ccwlock);
1478 while (!dev_fsm_final_state(cdev))
1481 if (cdev->private->state != DEV_STATE_OFFLINE)
1483 ccw_device_online(cdev);
1484 while (!dev_fsm_final_state(cdev))
1486 if (cdev->private->state != DEV_STATE_ONLINE)
1490 spin_unlock_irq(cdev->ccwlock);
1495 ccw_device_probe_console(void)
1497 struct subchannel *sch;
1500 if (xchg(&console_cdev_in_use, 1) != 0)
1501 return ERR_PTR(-EBUSY);
1502 sch = cio_probe_console();
1504 console_cdev_in_use = 0;
1505 return (void *) sch;
1507 memset(&console_cdev, 0, sizeof(struct ccw_device));
1508 memset(&console_private, 0, sizeof(struct ccw_device_private));
1509 console_cdev.private = &console_private;
1510 console_private.cdev = &console_cdev;
1511 ret = ccw_device_console_enable(&console_cdev, sch);
1513 cio_release_console();
1514 console_cdev_in_use = 0;
1515 return ERR_PTR(ret);
1517 console_cdev.online = 1;
1518 return &console_cdev;
1521 static int ccw_device_pm_restore(struct device *dev);
1523 int ccw_device_force_console(void)
1525 if (!console_cdev_in_use)
1527 return ccw_device_pm_restore(&console_cdev.dev);
1529 EXPORT_SYMBOL_GPL(ccw_device_force_console);
1533 * get ccw_device matching the busid, but only if owned by cdrv
1536 __ccwdev_check_busid(struct device *dev, void *id)
1542 return (strcmp(bus_id, dev_name(dev)) == 0);
1547 * get_ccwdev_by_busid() - obtain device from a bus id
1548 * @cdrv: driver the device is owned by
1549 * @bus_id: bus id of the device to be searched
1551 * This function searches all devices owned by @cdrv for a device with a bus
1552 * id matching @bus_id.
1554 * If a match is found, its reference count of the found device is increased
1555 * and it is returned; else %NULL is returned.
1557 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1561 struct device_driver *drv;
1563 drv = get_driver(&cdrv->driver);
1567 dev = driver_find_device(drv, NULL, (void *)bus_id,
1568 __ccwdev_check_busid);
1571 return dev ? to_ccwdev(dev) : NULL;
1574 /************************** device driver handling ************************/
1576 /* This is the implementation of the ccw_driver class. The probe, remove
1577 * and release methods are initially very similar to the device_driver
1578 * implementations, with the difference that they have ccw_device
1581 * A ccw driver also contains the information that is needed for
1585 ccw_device_probe (struct device *dev)
1587 struct ccw_device *cdev = to_ccwdev(dev);
1588 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1591 cdev->drv = cdrv; /* to let the driver call _set_online */
1593 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1604 ccw_device_remove (struct device *dev)
1606 struct ccw_device *cdev = to_ccwdev(dev);
1607 struct ccw_driver *cdrv = cdev->drv;
1614 spin_lock_irq(cdev->ccwlock);
1615 ret = ccw_device_offline(cdev);
1616 spin_unlock_irq(cdev->ccwlock);
1618 wait_event(cdev->private->wait_q,
1619 dev_fsm_final_state(cdev));
1621 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1622 "device 0.%x.%04x\n",
1623 ret, cdev->private->dev_id.ssid,
1624 cdev->private->dev_id.devno);
1625 /* Give up reference obtained in ccw_device_set_online(). */
1626 put_device(&cdev->dev);
1628 ccw_device_set_timeout(cdev, 0);
1633 static void ccw_device_shutdown(struct device *dev)
1635 struct ccw_device *cdev;
1637 cdev = to_ccwdev(dev);
1638 if (cdev->drv && cdev->drv->shutdown)
1639 cdev->drv->shutdown(cdev);
1643 static int ccw_device_pm_prepare(struct device *dev)
1645 struct ccw_device *cdev = to_ccwdev(dev);
1647 if (work_pending(&cdev->private->todo_work))
1649 /* Fail while device is being set online/offline. */
1650 if (atomic_read(&cdev->private->onoff))
1653 if (cdev->online && cdev->drv && cdev->drv->prepare)
1654 return cdev->drv->prepare(cdev);
1659 static void ccw_device_pm_complete(struct device *dev)
1661 struct ccw_device *cdev = to_ccwdev(dev);
1663 if (cdev->online && cdev->drv && cdev->drv->complete)
1664 cdev->drv->complete(cdev);
1667 static int ccw_device_pm_freeze(struct device *dev)
1669 struct ccw_device *cdev = to_ccwdev(dev);
1670 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1671 int ret, cm_enabled;
1673 /* Fail suspend while device is in transistional state. */
1674 if (!dev_fsm_final_state(cdev))
1678 if (cdev->drv && cdev->drv->freeze) {
1679 ret = cdev->drv->freeze(cdev);
1684 spin_lock_irq(sch->lock);
1685 cm_enabled = cdev->private->cmb != NULL;
1686 spin_unlock_irq(sch->lock);
1688 /* Don't have the css write on memory. */
1689 ret = ccw_set_cmf(cdev, 0);
1693 /* From here on, disallow device driver I/O. */
1694 spin_lock_irq(sch->lock);
1695 ret = cio_disable_subchannel(sch);
1696 spin_unlock_irq(sch->lock);
1701 static int ccw_device_pm_thaw(struct device *dev)
1703 struct ccw_device *cdev = to_ccwdev(dev);
1704 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1705 int ret, cm_enabled;
1710 spin_lock_irq(sch->lock);
1711 /* Allow device driver I/O again. */
1712 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1713 cm_enabled = cdev->private->cmb != NULL;
1714 spin_unlock_irq(sch->lock);
1719 ret = ccw_set_cmf(cdev, 1);
1724 if (cdev->drv && cdev->drv->thaw)
1725 ret = cdev->drv->thaw(cdev);
1730 static void __ccw_device_pm_restore(struct ccw_device *cdev)
1732 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1734 if (cio_is_console(sch->schid))
1737 * While we were sleeping, devices may have gone or become
1738 * available again. Kick re-detection.
1740 spin_lock_irq(sch->lock);
1741 cdev->private->flags.resuming = 1;
1742 ccw_device_recognition(cdev);
1743 spin_unlock_irq(sch->lock);
1744 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
1745 cdev->private->state == DEV_STATE_DISCONNECTED);
1747 cdev->private->flags.resuming = 0;
1750 static int resume_handle_boxed(struct ccw_device *cdev)
1752 cdev->private->state = DEV_STATE_BOXED;
1753 if (ccw_device_notify(cdev, CIO_BOXED))
1755 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1759 static int resume_handle_disc(struct ccw_device *cdev)
1761 cdev->private->state = DEV_STATE_DISCONNECTED;
1762 if (ccw_device_notify(cdev, CIO_GONE))
1764 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1768 static int ccw_device_pm_restore(struct device *dev)
1770 struct ccw_device *cdev = to_ccwdev(dev);
1771 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1772 int ret = 0, cm_enabled;
1774 __ccw_device_pm_restore(cdev);
1775 spin_lock_irq(sch->lock);
1776 if (cio_is_console(sch->schid)) {
1777 cio_enable_subchannel(sch, (u32)(addr_t)sch);
1778 spin_unlock_irq(sch->lock);
1781 cdev->private->flags.donotify = 0;
1782 /* check recognition results */
1783 switch (cdev->private->state) {
1784 case DEV_STATE_OFFLINE:
1786 case DEV_STATE_BOXED:
1787 ret = resume_handle_boxed(cdev);
1788 spin_unlock_irq(sch->lock);
1792 case DEV_STATE_DISCONNECTED:
1793 goto out_disc_unlock;
1795 goto out_unreg_unlock;
1797 /* check if the device id has changed */
1798 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1799 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
1800 "changed from %04x to %04x)\n",
1801 sch->schid.ssid, sch->schid.sch_no,
1802 cdev->private->dev_id.devno,
1803 sch->schib.pmcw.dev);
1804 goto out_unreg_unlock;
1806 /* check if the device type has changed */
1807 if (!ccw_device_test_sense_data(cdev)) {
1808 ccw_device_update_sense_data(cdev);
1809 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1813 if (!cdev->online) {
1817 ret = ccw_device_online(cdev);
1819 goto out_disc_unlock;
1821 cm_enabled = cdev->private->cmb != NULL;
1822 spin_unlock_irq(sch->lock);
1824 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1825 if (cdev->private->state != DEV_STATE_ONLINE) {
1826 spin_lock_irq(sch->lock);
1827 goto out_disc_unlock;
1830 ret = ccw_set_cmf(cdev, 1);
1832 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1833 "(rc=%d)\n", cdev->private->dev_id.ssid,
1834 cdev->private->dev_id.devno, ret);
1840 if (cdev->online && cdev->drv && cdev->drv->restore)
1841 ret = cdev->drv->restore(cdev);
1846 ret = resume_handle_disc(cdev);
1847 spin_unlock_irq(sch->lock);
1853 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
1856 spin_unlock_irq(sch->lock);
1860 static struct dev_pm_ops ccw_pm_ops = {
1861 .prepare = ccw_device_pm_prepare,
1862 .complete = ccw_device_pm_complete,
1863 .freeze = ccw_device_pm_freeze,
1864 .thaw = ccw_device_pm_thaw,
1865 .restore = ccw_device_pm_restore,
1868 struct bus_type ccw_bus_type = {
1870 .match = ccw_bus_match,
1871 .uevent = ccw_uevent,
1872 .probe = ccw_device_probe,
1873 .remove = ccw_device_remove,
1874 .shutdown = ccw_device_shutdown,
1879 * ccw_driver_register() - register a ccw driver
1880 * @cdriver: driver to be registered
1882 * This function is mainly a wrapper around driver_register().
1884 * %0 on success and a negative error value on failure.
1886 int ccw_driver_register(struct ccw_driver *cdriver)
1888 struct device_driver *drv = &cdriver->driver;
1890 drv->bus = &ccw_bus_type;
1891 drv->name = cdriver->name;
1892 drv->owner = cdriver->owner;
1894 return driver_register(drv);
1898 * ccw_driver_unregister() - deregister a ccw driver
1899 * @cdriver: driver to be deregistered
1901 * This function is mainly a wrapper around driver_unregister().
1903 void ccw_driver_unregister(struct ccw_driver *cdriver)
1905 driver_unregister(&cdriver->driver);
1908 /* Helper func for qdio. */
1909 struct subchannel_id
1910 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1912 struct subchannel *sch;
1914 sch = to_subchannel(cdev->dev.parent);
1918 static void ccw_device_todo(struct work_struct *work)
1920 struct ccw_device_private *priv;
1921 struct ccw_device *cdev;
1922 struct subchannel *sch;
1923 enum cdev_todo todo;
1925 priv = container_of(work, struct ccw_device_private, todo_work);
1927 sch = to_subchannel(cdev->dev.parent);
1928 /* Find out todo. */
1929 spin_lock_irq(cdev->ccwlock);
1931 priv->todo = CDEV_TODO_NOTHING;
1932 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1933 priv->dev_id.ssid, priv->dev_id.devno, todo);
1934 spin_unlock_irq(cdev->ccwlock);
1937 case CDEV_TODO_ENABLE_CMF:
1940 case CDEV_TODO_REBIND:
1941 ccw_device_do_unbind_bind(cdev);
1943 case CDEV_TODO_REGISTER:
1944 io_subchannel_register(cdev);
1946 case CDEV_TODO_UNREG_EVAL:
1947 if (!sch_is_pseudo_sch(sch))
1948 css_schedule_eval(sch->schid);
1950 case CDEV_TODO_UNREG:
1951 if (sch_is_pseudo_sch(sch))
1952 ccw_device_unregister(cdev);
1954 ccw_device_call_sch_unregister(cdev);
1959 /* Release workqueue ref. */
1960 put_device(&cdev->dev);
1964 * ccw_device_sched_todo - schedule ccw device operation
1968 * Schedule the operation identified by @todo to be performed on the slow path
1969 * workqueue. Do nothing if another operation with higher priority is already
1970 * scheduled. Needs to be called with ccwdev lock held.
1972 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
1974 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
1975 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
1977 if (cdev->private->todo >= todo)
1979 cdev->private->todo = todo;
1980 /* Get workqueue ref. */
1981 if (!get_device(&cdev->dev))
1983 if (!queue_work(slow_path_wq, &cdev->private->todo_work)) {
1984 /* Already queued, release workqueue ref. */
1985 put_device(&cdev->dev);
1989 MODULE_LICENSE("GPL");
1990 EXPORT_SYMBOL(ccw_device_set_online);
1991 EXPORT_SYMBOL(ccw_device_set_offline);
1992 EXPORT_SYMBOL(ccw_driver_register);
1993 EXPORT_SYMBOL(ccw_driver_unregister);
1994 EXPORT_SYMBOL(get_ccwdev_by_busid);
1995 EXPORT_SYMBOL(ccw_bus_type);
1996 EXPORT_SYMBOL(ccw_device_work);
1997 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);